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Feathers from waterfowl (c) Daunen- und Federnverbände Mainz
05.03.2024

Adhesives: Feathers replace petroleum

Adhesives are almost always based on fossil raw materials such as petroleum. Researchers at Fraunhofer have recently developed a process that allows to utilize keratin for this purpose. This highly versatile protein compound can be found, for instance, in chicken feathers. Not only can it be used to manufacture a host of different adhesives for a variety of applications, but the processes and end products are also sustainable and follow the basic principles underlying a bioinspired circular economy. The project, developed together with Henkel AG & Co. KGaA, addresses a billion-dollar market.

Adhesives are almost always based on fossil raw materials such as petroleum. Researchers at Fraunhofer have recently developed a process that allows to utilize keratin for this purpose. This highly versatile protein compound can be found, for instance, in chicken feathers. Not only can it be used to manufacture a host of different adhesives for a variety of applications, but the processes and end products are also sustainable and follow the basic principles underlying a bioinspired circular economy. The project, developed together with Henkel AG & Co. KGaA, addresses a billion-dollar market.

Adhesives are found nearly everywhere: in sports shoes, smartphones, floor coverings, furniture, textiles or packaging. Even auto windshields are glued into place using adhesives. Experts recognize more than 1,000 different types of adhesives. These can bond almost every imaginable material to another. Adhesives weigh very little and so lend themselves to lightweight design. Surfaces bonded with adhesive do not warp because, unlike with screw fastenings, the load is distributed evenly. Adhesives do not rust, and seal out moisture. Surfaces bonded with adhesive are also less susceptible to vibration. Added to which, adhesives are inexpensive and relatively easy to work with.

Feathers from poultry meat production
Traditionally, adhesives have almost always been made from fossil raw materials such as petroleum. The Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB has recently adopted a different approach. Researchers there have been using feathers as a base material instead of petroleum. Feathers are a by-product of poultry meat production. They are destroyed or mixed into animal feed. But feathers are far too valuable to go to waste because they contain the structural protein keratin. This biopolymer is found in animals and makes up talons, claws, hooves or feathers. Its fibrous structure is extremely strong.

Why keratin is perfect for manufacturing adhesives
Keratin is a biodegradable and thus eco-friendly material whose structure has specific properties that make it particularly suitable for the manufacture of adhesives. Keratin's polymer structure, i.e., its very long-chain molecules, as well as its ability to undergo cross-linking reactions predestine it for the manufacture of various adhesives. “The properties required for adhesives are to some extent already inherent in the base material and only need to be unlocked, modified and activated,” explains project manager Dr. Michael Richter.

Platform chemical and specialty adhesives
Over the past three years, Fraunhofer IGB has been working with Henkel AG & Co. KGaA on the KERAbond project: “Specialty chemicals from customized functional keratin proteins” — Kera being short for keratin, combined with the English word bond. Henkel is a global market leader in the adhesives sector.

The partners in the project have recently developed and refined a new process. In the first stage, feathers received from the slaughterhouse are sterilized, washed and mechanically shredded. Next, an enzyme process splits the long-chain biopolymers or protein chains into short-chain polymers by means of hydrolysis.

The output product is a platform chemical that can serve as a base material for further development of specially formulated adhesives. “We use the process      and the platform chemical as a “toolbox” to integrate bio-enhanced properties into the end product,” says Richter. This means parameters can be specified for the target special adhesive such as curing time, elasticity, thermal properties or strength. Also, it’s not just adhesives that are easy to manufacture but also related substances such as hardeners, coatings or primers.

In the next stage, the Fraunhofer team set about converting the feathers on a large scale. Ramping up the process fell to the Fraunhofer Center for Chemical-Biotechnological Processes CBP in Leuna. The aim was to prove that the keratin-based platform chemicals can also be manufactured cost-efficiently on an industrial scale. This involved processing several kilograms of chicken feathers, with the material produced being used for promising initial material trials at Fraunhofer IGB and Henkel.

Foundations of a bioinspired economy
This bioinspired process is of particular significance for the Fraunhofer-Gesellschaft. Biotechnology is in fact one of the main fields of research for the Fraunhofer-Gesellschaft: “We draw our inspiration from functionality or properties that already exist in nature or in natural raw materials. And we attempt to translate these properties into products through innovative manufacturing methods. This generates a bioinspired cycle for valuable raw materials, Richter explains.

The project carries some economic weight. According to Statista, around one million tons of adhesives were manufactured in Germany alone in 2019. Total value is around 1.87 billion euros.

A patent application has been filed for the new process and an article published in a scientific journal. Two PhD students who have conducted extensive research on the project at Henkel and Fraunhofer are expected to complete their theses in the first quarter of 2024. This new keratin-based technology will allow a host of platform chemicals to be produced in a sustainable, bioinspired way.

The KERAbond project has been funded and supported over the past three years by Fachagentur Nachwachsende Rohstoffe (FNR) in Gülzow on behalf of the Federal Ministry of Food and Agriculture (BMEL) under the Renewable Resources Funding funding program (grant number 22014218).

Source:

Fraunhofer IBG

Bakery Pexels at Pixabay
08.01.2024

BakeTex: Textile baking mat supports bakeries in saving energy

The ongoing energy crisis is increasingly pushing the bakery trade to its limits. Bakeries everywhere are having to close because they can no longer afford the sharp rise in the cost of electricity and gas. The use of energy-efficient ovens and the optimisation of production processes are important components that help to save energy. Researchers at the Fraunhofer Application Centre for Textile Fibre Ceramics TFK in Münchberg have now developed another building block: a textile baking base.
 
In bakeries, trays are normally used as a base for the baked goods in combination with baking paper or flour, which not only leads to large amounts of waste, but also to health problems (baker's asthma). The baking trays are also heavy and their mass increases the energy consumption in the oven, as they have to be heated with every baking process.

The ongoing energy crisis is increasingly pushing the bakery trade to its limits. Bakeries everywhere are having to close because they can no longer afford the sharp rise in the cost of electricity and gas. The use of energy-efficient ovens and the optimisation of production processes are important components that help to save energy. Researchers at the Fraunhofer Application Centre for Textile Fibre Ceramics TFK in Münchberg have now developed another building block: a textile baking base.
 
In bakeries, trays are normally used as a base for the baked goods in combination with baking paper or flour, which not only leads to large amounts of waste, but also to health problems (baker's asthma). The baking trays are also heavy and their mass increases the energy consumption in the oven, as they have to be heated with every baking process.

With this in mind, the Bavarian Research Foundation approved a research project in 2021 to develop an alternative to conventional baking trays, which was successfully completed in 2023. The project partners were the Fraunhofer Application Centre for Textile Fibre Ceramics TFK from Münchberg, Fickenschers Backhaus GmbH from Münchberg and Weberei Wilhelm Zuleeg GmbH from Helmbrechts.

The aim of the project was to develop an energy-saving, pollutant-free and reusable textile baking mat with an integrated non-stick effect for use in industrial bakeries. Lightweight and heat-resistant textiles offer the potential to lower the preheating temperature in the oven and thus reduce energy consumption.
 
In a first step, a thin para-aramid fabric made of 120 g/m² long staple fibre yarn was therefore produced and stretched on a metallic frame. "The leno weave proved to be particularly suitable for the weave. Its characteristic lattice structure ensures that the textile is not only light but also permeable to air," says Silke Grosch from the Fraunhofer Application Centre TFK.

"In addition, by fixing the threads in place, the fabric cannot warp during washing and retains its shape for a long time." Finally, a full-surface silicone coating ensures that the baked goods do not stick to the baking base. This means that the previously necessary baking paper and flour layer can be dispensed with. To ensure that the rolls come out of the oven just as crispy and brown as with a standard baking tray, only the baking programme needs to be adjusted. Another key advantage of the textile baking tray is that it can be folded and therefore stored in a space-saving manner.

In the course of the fourth industrial revolution (Industry 4.0), the baking tray will be equipped with intelligent additional functions. On the one hand, the production data in the bakery can be determined using RFID chips or QR codes, and on the other hand, baked goods can be advertised in a targeted manner using customised branding.

Prof. Dr Frank Ficker, Head of the Fraunhofer Application Centre TFK, sums up: "With the textile baking base, we have developed a contemporary and resource-saving product together with our project partners that is characterised by its low weight and high flexibility. Together with the potential energy savings, this makes it interesting for many bakeries."

The Fraunhofer Application Centre for Textile Fibre Ceramics TFK in Münchberg specialises in the development, manufacture and testing of textile ceramic components. It is part of the Fraunhofer Centre for High Temperature Lightweight Construction HTL in Bayreuth, a facility of the Fraunhofer Institute for Silicate Research ISC with headquarters in Würzburg.

Source:

Fraunhofer Application Centre for Textile Fibre Ceramics
Translation Textination

offshore windpark Nicholas Doherty, unsplash
17.10.2023

Pyrolysis processes promise sustainable recycling of fiber composites

Wind turbines typically operate for 20 to 30 years before they are undergoing dismantling and recycling. However, the recycling of fiber composites, especially from the thick-walled rotor blade parts, has been inadequate until now. The prevailing methods involve thermal or mechanical recycling. For a sustainable and holistic recycling process, a research consortium led by Fraunhofer IFAM is pooling their expertise to recover the fibers through pyrolysis. Subsequent surface treatment and quality testing of the recyclates allow for them to be used again in industry.

Wind turbines typically operate for 20 to 30 years before they are undergoing dismantling and recycling. However, the recycling of fiber composites, especially from the thick-walled rotor blade parts, has been inadequate until now. The prevailing methods involve thermal or mechanical recycling. For a sustainable and holistic recycling process, a research consortium led by Fraunhofer IFAM is pooling their expertise to recover the fibers through pyrolysis. Subsequent surface treatment and quality testing of the recyclates allow for them to be used again in industry.

Today, the vast majority of wind turbines can already be recycled cleanly. In the case of rotor blades, however, recycling is only just beginning. Due to the 20-year operation period and the installation rates, the blade volume for recycling will be increasing in the coming years and decades. In 2000, for example, around 6,000 wind turbines were erected in Germany, which now need to be fed into a sustainable recycling process. In 2022, about 30,000 onshore and offshore wind turbines with a capacity of 65 gigawatts were in operation in Germany alone.

As wind energy is the most important cornerstone for a climate-neutral power supply, the German government has set itself the goal of further increasing its wind energy capacity by 2030 by installing larger and more modern turbines. Rotor blades will become longer, the proportion of carbon fibers used will continue to increase - and so will the amount of waste. In addition, the existing material mix in rotor blades is expected to increase in the future and precise knowledge of the structure of the components will become even more important for recycling. This underscores the urgency of developing sustainable processing methods, especially for recycling the thick-walled fiber composites in the rotor blades.

Economic and ecological recycling solution for fiber composites on the horizon
Rotor blades of wind turbines currently up for recycling consist of more than 85 percent of glass- and carbon-fiber-reinforced thermosets (GFRP/CFRP). A large proportion of these materials is found in the flange and root area and within the fiber-reinforced straps as thick-walled laminates with a wall thicknesses of up to 150 mm. Research into high-quality material fiber recycling as continuous fibers is of particular importance, not only because of the energy required for carbon fiber production. This is where the project "Pyrolysis of thick-walled fiber composites as a key innovation in the recycling process for wind turbine rotor blades" – "RE SORT" for short – funded by the German Federal Ministry of Economics and Climate Protection comes in. The aim of the project team is the complete recycling by means of pyrolysis.

A prerequisite for high-quality recycling of fiber composites is the separation of the fibers from the mostly thermoset matrix. Although pyrolysis is a suitable process for this purpose, it has not yet gained widespread adoption. Within the project, the project partners are therefore investigating and developing pyrolysis technologies that make the recycling of thick-walled fiber composite structures economically feasible and are technically different from the recycling processes commonly used for fiber composites today. Both quasi-continuous batch and microwave pyrolysis are being considered.

Batch pyrolysis, which is being developed within the project, is a pyrolysis process in which the thermoset matrix of thick fiber composite components is slowly decomposed into oily and especially gaseous hydrocarbon compounds by external heating. In microwave pyrolysis, energy is supplied by the absorption of microwave radiation, resulting in internal rapid heat generation. Quasi-continuous batch pyrolysis as well as microwave pyrolysis allow the separation of pyrolysis gases or oils. The planned continuous microwave pyrolysis also allows for the fibers to be preserved and reused in their full length.

How the circular economy succeeds - holistic utilization of the recycled products obtained
In the next step, the surfaces of the recovered recycled fibers are prepared by means of atmospheric plasmas and wet-chemical coatings to ensure their suitability for reuse in industrial applications. Finally, strength tests can be used to decide whether the recycled fibers will be used again in the wind energy industry or, for example, in the automotive or sporting goods sectors.

The pyrolysis oils and pyrolysis gases obtained in batch and microwave pyrolysis are evaluated with respect to their usability as raw materials for polymer synthesis (pyrolysis oils) or as energy sources for energy use in combined heat and power (CHP) plants (pyrolysis gases).

Both quasi-continuous batch pyrolysis and continuous-flow microwave pyrolysis promise economical operation and a significant reduction in the environmental footprint of wind energy. Therefore, the chances for a technical implementation and utilization of the project results are very good, so that this project can make a decisive contribution to the achievement of the sustainability and climate goals of the German Federal Government.

Source:

Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM

A quick check with a smartphone, and the integrated spectrum analyzer recognizes the fabric the garment is made from. Photo: © Fraunhofer IPMS. A quick check with a smartphone, and the integrated spectrum analyzer recognizes the fabric the garment is made from.
10.10.2023

Checking clothing using a smartphone, AI and infrared spectroscopy

Researchers at Fraunhofer have developed an ultra-compact near-infrared spectrometer suitable for recognizing and analyzing textiles. Mixed fabrics can also be reliably identified through the combination of imaging, special AI (artificial intelligence) algorithms and spectroscopy. The technology could be used to optimize recycling old clothing, so old apparel could be sorted according to type. A highly miniaturized version of the system can even fit into a smartphone. This could lead to a host of new applications for end-users in everyday life — from checking clothes when out shopping to detecting counterfeits.

Researchers at Fraunhofer have developed an ultra-compact near-infrared spectrometer suitable for recognizing and analyzing textiles. Mixed fabrics can also be reliably identified through the combination of imaging, special AI (artificial intelligence) algorithms and spectroscopy. The technology could be used to optimize recycling old clothing, so old apparel could be sorted according to type. A highly miniaturized version of the system can even fit into a smartphone. This could lead to a host of new applications for end-users in everyday life — from checking clothes when out shopping to detecting counterfeits.

Infrared spectrometers are powerful measuring instruments when it comes to non-destructive analysis of organic materials. The Fraunhofer Institute for Photonic Microsystems IPMS in Dresden has recently developed a spectral analyzer system that recognizes and analyzes textile fabrics. The system can also reliably recognize mixed fabrics. Possible applications range from checking fabrics when out shopping to cleaning garments correctly, and even sustainable, sorted recycling. The spectrometer is so tiny, it can be integrated into a smartphone.

Researchers at Fraunhofer rely on near-infrared (NIR) spectroscopy to achieve the required reliability and accuracy when identifying textiles. The system works for wavelengths between 950 and 1900 nanometers, which is close to the visible spectrum. Advantages of near-infrared technology include being easy to use and having a wide range of applications. “We combine NIR spectroscopy with imaging and AI to achieve higher accuracy when recognizing and analyzing objects,” explains Dr. Heinrich Grüger, research scientist in the Sensoric Micromodules department at Fraunhofer IPMS.

How textile analysis works
Firstly, a conventional camera module captures an image of the garment. The AI selects a specific point from the fabric’s image data to be examined by the spectral analyzer module. Light reflected from the fabric is captured by the spectrometer module. There, it passes through an entrance slit, is transformed into parallel light beams using a collimating mirror and projected onto a grating using a scanning mirror. Depending on the angle of incidence and exit, the grating splits the light beams into different wavelengths. Light reflected from the grating is directed by the scanner mirror to a detector which captures the light as an electrical signal. An A/D converter then digitizes these signals, which are subsequently analyzed in the signal processor. The resulting spectrometric profile for the textile fabric reveals which fibers it is made from by comparing to a reference database.“ The optical resolution is 10 nanometers. This high resolution means the NIR spectrometer can also use AI to identify mixed fabrics such as items of clothing made from polyester and cotton,” says Grüger. Measuring just 10 mm × 10 mm and being 6.5 mm thick, the system is so compact it could easily be integrated into a standard smartphone.

Recycling old clothing
Grüger sees an important application for the AI-controlled spectrometer when it comes to recycling. According to the Federal Statistical Office of Germany, approximately 176,200 tons of textile and clothing waste was collected from private homes in Germany in 2021. NIR spectroscopy could improve recycling efficiency and reduce the mountain of old clothing. This would enable companies that recycle old clothing to sort it more efficiently and faster. Textiles that are still in one piece, for instance, go to the second-hand trade. Damaged textiles are sorted for recycling, and the fibers they are made from, such as linen, silk, cotton or lyocell, can be reused. Severely soiled textiles would be incinerated or processed into insulation mats, for example. Spectroscopic identifies and sorts textiles more accurately and much faster than a human can.

If NIR spectroscopy was to be integrated into a smartphone, end-users might also benefit from the Fraunhofer institute’s technology. When buying clothes, a quick check with a smartphone reveals whether that expensive silk scarf is genuinely made from silk, or whether that exclusive dress from the fashion label is not instead a counterfeit, exposed through an alternative mix of fabrics. And should the label with the cleaning instructions no longer be legible, the smartphone has a textile scanner to identify the fabric and so determine the appropriate wash cycle.

Food check and dermatology
Researchers at Fraunhofer IPMS can even envisage applications beyond the textile industry. Smartphones fitted with spectrometers might be used to provide information about the quality of groceries such as fruit and vegetables when out shopping. The technology might conceivably also be used to examine skin. A quick scan with the cell phone spectrometer could identify particularly dry or greasy patches. Perhaps applications in medical diagnostics might even be conceivable — examining patches of skin where a melanoma is suspected, for example — but this would need professional involvement too.

Source:

Fraunhofer Institute for Photonic Microsystems

Ultra-thin smart textiles are being refined for their use in obstetric monitoring and will enable analysis of vital data via app for pregnancies. Photo: Pixabay, Marjon Besteman
24.07.2023

Intelligent Patch for Remote Monitoring of Pregnancy

During pregnancy, regular medical check-ups provide information about the health and development of the pregnant person and the child. However, these examinations only provide snapshots of their state, which can be dangerous, especially in high-risk cases. To enable convenient and continuous monitoring during this sensitive phase, an international research consortium is planning to further develop the technology of smart textiles. A patch equipped with highly sensitive electronics is meant to collect and evaluate vital data. In addition, the sensors will be integrated into baby clothing in order to improve the future of medical monitoring for newborns with the highest level of data security.

During pregnancy, regular medical check-ups provide information about the health and development of the pregnant person and the child. However, these examinations only provide snapshots of their state, which can be dangerous, especially in high-risk cases. To enable convenient and continuous monitoring during this sensitive phase, an international research consortium is planning to further develop the technology of smart textiles. A patch equipped with highly sensitive electronics is meant to collect and evaluate vital data. In addition, the sensors will be integrated into baby clothing in order to improve the future of medical monitoring for newborns with the highest level of data security.

The beginning of a pregnancy is accompanied by a period of intensive health monitoring of the baby and the pregnant person. Conventional prenatal examinations with ultrasound devices, however, only capture snapshots of the respective condition and require frequent visits to doctors, especially in high-risk pregnancies. With the help of novel wearables and smart textiles, researchers in the EU-funded project Newlife aim to enable continuous obstetric monitoring in everyday life.

One goal of the consortium, consisting of 25 partners, is the development of a biocompatible, stretchable, and flexible patch to monitor the progress of the pregnancy and the embryo. Similar to a band-aid, the patch will be applied to the pregnant person’s skin, continuously recording vital data using miniaturized sensors (e.g., ultrasound) and transmitting it via Bluetooth.

For some time now, modern medical technology has been relying on smart textiles and intelligent wearables to offer patients convenient, continuous monitoring at home instead of stationary surveillance. At the Fraunhofer Institute for Reliability and Microelectronics IZM, a team led by Christine Kallmayer is bringing this technology to application-oriented implementation, benefitting from the Fraunhofer IZM’s years of experience with integrating technologies into flexible materials. For the integrated patch, the researchers are using thermoplastic polyurethane as base materials, in which electronics and sensors are embedded. This ensures that the wearing experience is similar to that of a regular band-aid instead of a rigid film.

To ensure that the obstetric monitoring is imperceptible and comfortable for both pregnant individuals and the unborn child, the project consortium plans to integrate innovative MEMS-based ultrasound sensors directly into the PU material. The miniaturized sensors are meant to record data through direct skin contact. Stretchable conductors made of TPU material tracks will then transmit the information to the electronic evaluation unit and finally to a wireless interface, allowing doctors and midwives to view all relevant data in an app. In addition to ultrasound, the researchers are planning to integrate additional sensors such as microphones, temperature sensors, and electrodes.

Even after birth, the new integration technology can be of great benefit to medical technology: With further demonstrators, the Newlife team plans to enable the monitoring of newborns. Sensors for continuous ECG, respiration monitoring, and infrared spectroscopy to observe brain activity will be integrated into the soft textile of a baby bodysuit and a cap. "Especially for premature infants and newborns with health risks, remote monitoring is a useful alternative to hospitalization and wired monitoring. For this purpose, we must guarantee an unprecedented level of comfort provided by the ultra-thin smart textiles: no electronics should be noticeable. Additionally, the entire module has to be extremely reliable, as the smart textiles should easily withstand washing cycles," explains Christine Kallmayer, project manager at Fraunhofer IZM.

For external monitoring of the baby's well-being, the project is also researching ways to use camera data and sensor technology in the baby's bed. Once the hardware basis of the patch, the textile electronics, and the sensor bed is built and tested, the project partners will take another step forward. Through cloud-based solutions, AI and machine learning will be used to simplify the implementation for medical staff and ensure the highest level of data security.

The Newlife project is coordinated by Philips Electronics Nederland B.V. and will run until the end of 2025. It is funded by the European Union under the Horizon Europe program as part of Key Digital Technologies Joint Undertaking under grant number 101095792 with a total of 18.7 million euros.

Source:

Fraunhofer Institute for Reliability and Microintegration IZM

(c) Nadine Glad
18.07.2023

Promoting transparent supply chains and a more circular economy with digital product passports

Any prospective buyer interested in knowing more about the products they have set their eyes on will have to cope with limited information on print or online manuals or engage in time-consuming research. This may change soon, as the European Commission introduced a standardised digital product passport for the upcoming legislation. A project consortium has been formed with partners from industry and academia to set ground for the developments. The idea is for the proposed passports, supported by EU regulations, to make all product information available along the entire value chain and easily accessible e.g. by QR code.

Any prospective buyer interested in knowing more about the products they have set their eyes on will have to cope with limited information on print or online manuals or engage in time-consuming research. This may change soon, as the European Commission introduced a standardised digital product passport for the upcoming legislation. A project consortium has been formed with partners from industry and academia to set ground for the developments. The idea is for the proposed passports, supported by EU regulations, to make all product information available along the entire value chain and easily accessible e.g. by QR code.

ID cards and passports are usually the first things packed when one goes on a journey. They are internationally recognized and accepted documents with all the necessary information about the holder: Commonplace items for people that will soon become just as common for electronic devices, textiles, or batteries. But mobile phones, tablet computers, and their kin usually do not travel with a passport pouch, so their digital product passports with all their “personal details” will soon be accessible at every link in the value chain via a QR code or RFID chip.

Consumers looking to buy a new piece of clothing, a piece of electronics, or even furniture or toys should have more means to understand important information about their products, including their energy efficiency, the labor conditions during manufacturing, or their reparability, in order to make informed and sustainable purchasing choices.

Product passports also hold great potential for other actors, e.g. for repairs or recycling. Current electronic products, often highly miniaturized, make it hard to understand with materials, not least toxic substances are contained and how they could be separated from another. Use-specific certificates can regulate that this type of information is available to the people who need to know it.

No final decision has yet been made about the range of information that will be contained in the product passports. For the CIRPASS project, Eduard Wagner and his team at Fraunhofer ZM is currently surveying which types of information are already covered by current legal requirements and which additional information could be contained on a digital product passport. Their aim is to provide an information architecture that determines which types of information have added value for which actors in the value chain and at what cost this information could be provided. A reparability scale that shows how easily a product is to repair has been required in France since 2021 and might be a good inclusion in the digital, pan-European product passport. “Information about energy efficiency is already required, but this information still has to be prepared on a case-by-case basis, and there are no universal European disclosure requirements for other types of circularity related information. Meaningful standardization here is one of the top goals of the product passport. Imagine we could compare the durability of all t-shirts in the EU between each other,” says sustainability expert Eduard Wagner.

For the first product passports to be ready by 2026, many actors still need to be brought on board and a consensus be found for which information is most relevant. “Our project has identified 23 groups of stakeholders that we are including in our survey of requirements, in all three sectors”, Wagner explains. “We have suppliers of materials, manufacturers of electronics, and representatives of repair and recycling associations with us.” The results of these consultations will go to the European Commission to act as pointers for the political process en route to new legal requirements for the product passport. Small to medium-sized enterprises are given special attention and support in this, as providing the required information can mean a considerable effort on their part.

Source:

Fraunhofer Institute for Reliability and Microintegration IZM

The plasma atmosphere is clearly visible in the reactor through the characteristic glow and flashes of light. © Fraunhofer IGB The plasma atmosphere is clearly visible in the reactor through the characteristic glow and flashes of light.
16.05.2023

Wastewater treatment: Plasma against toxic PFAS chemicals

Harmful PFAS chemicals can now be detected in many soils and bodies of water. Removing them using conventional filter techniques is costly and almost infeasible. Researchers at the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB are now successfully implementing a plasma-based technology in the AtWaPlas joint research project. Contaminated water is fed into a combined glass and stainless steel cylinder where it is then treated with ionized gas, i.e. plasma. This reduces the PFAS molecular chains, allowing the toxic substance to be removed at a low cost.

Harmful PFAS chemicals can now be detected in many soils and bodies of water. Removing them using conventional filter techniques is costly and almost infeasible. Researchers at the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB are now successfully implementing a plasma-based technology in the AtWaPlas joint research project. Contaminated water is fed into a combined glass and stainless steel cylinder where it is then treated with ionized gas, i.e. plasma. This reduces the PFAS molecular chains, allowing the toxic substance to be removed at a low cost.

Per- and polyfluoroalkyl substances (PFAS) have many special properties. As they are thermally and chemically stable as well as resistant to water, grease and dirt, they can be found in a large number of everyday products: Pizza boxes and baking paper are coated with them, for example, and shampoos and creams also contain PFAS. In industry they serve as extinguishing and wetting agents, and in agriculture they are used in plant protection products. However, traces of PFAS are now also being detected where they should not be found: in soil, rivers and groundwater, in food and in drinking water. This is how the harmful substances end up in the human body. Due to their chemical stability, eliminating these so-called “forever chemicals” has been almost impossible up to now without considerable effort and expense.

The AtWaPlas joint research project aims to change that. The acronym stands for Atmospheric Water Plasma Treatment. The innovative project is currently being run at the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB in Stuttgart in cooperation with the industrial partner HYDR.O. Geologen und Ingenieure GbR from Aachen. The aim is to treat and recover PFAS-contaminated water using plasma treatment.

The research team led by Dr. Georg Umlauf, an expert in functional surfaces and materials, utilizes plasma’s ability to attack the molecular chains of substances. The electrically conductive gas consisting of electrons and ions is generated when high voltage is applied. “Our experiments with plasma have been successful in shortening the PFAS molecule chains in water. This is a significant step towards efficiently removing these stubborn pollutants,” Umlauf is happy to report.

Water cycle in a stainless steel cylinder
Fraunhofer researchers are using a cylindrical construction for this plasma process. Inside is a stainless steel tube, which serves as the ground electrode of the electrical circuit. The outer copper mesh then acts as a high-voltage electrode and is protected on the inside by a glass dielectric. A very small gap is left between the two, which is filled with an air mixture. This air mixture is converted into plasma when a voltage of several kilovolts is applied. It is visible to the human eye by its characteristic glow and discharge as flashes of light.

During the purification process, the PFAS-contaminated water is introduced at the bottom of the stainless steel tank and pumped upwards. It then travels down through the gap between the electrodes, passing through the electrically active plasma atmosphere. The plasma breaks up and shortens the PFAS molecule chains as it discharges. The water is repeatedly pumped through both the steel reactor and the plasma discharge zone in a closed circuit, reducing the PFAS molecule chains further each time until they are completely mineralized. “Ideally, the harmful PFAS substances are eliminated to the point that they can no longer be detected in mass spectrometric measurements. This also complies with the strict German Drinking Water Ordinance (TrinkwV) regulations regarding PFAS concentrations,” says Umlauf.

The technology developed at the Fraunhofer Institute has a key advantage over conventional methods such as active carbon filtering: “Active carbon filters can bind the harmful substances, but they are unable to eliminate them. This means that the filters must be replaced and disposed of regularly. The AtWaPlas technology, on the other hand, is capable of completely eliminating the harmful substances without any residue and is very efficient and low-maintenance,” explains Fraunhofer expert Umlauf.

Real water samples instead of synthetic laboratory samples
In order to ensure true feasibility, the Fraunhofer researchers are testing the plasma purification under more challenging conditions. Conventional test methods involve using perfectly clean water and PFAS solutions that have been synthetically mixed in the laboratory. However, the research team in Stuttgart is using “real” water samples that come from PFAS-contaminated areas. The samples are collected by the project partner HYDR.O. Geologen und Ingenieure GbR from Aachen. The company specializes in cleaning up contaminated sites and also carries out hydrodynamic simulations.

The real water samples that Umlauf and his team work with therefore contain PFAS as well as other particles, suspended solids and organic turbidity. “This is how we verify the purification efficiency of AtWaPlas, not only using synthetic laboratory samples, but also under real conditions with changing water qualities. The process parameters can be adapted and further developed at the same time,” explains Umlauf.

This plasma method can also be used to break down other harmful substances, including pharmaceutical residues in wastewater, pesticides and herbicides, but also industrial chemicals such as cyanides. AtWaPlas can also be used to treat drinking water in mobile applications in an environmentally friendly and cost-effective way.

The AtWaPlas joint research project launched in JuIy 2021. After a successful series of pilot-scale tests with a 5 liter reactor, the Fraunhofer team is now working with the joint research partner to further optimize the process. Georg Umlauf states: “Our current objective is to completely eliminate toxic PFAS by extending process times and increasing the number of circulations in the tank. We also want to make the AtWaPlas technology available for practical application on a larger scale.” The future could see corresponding plants set up as standalone purification stages in sewage treatment plants or used in portable containers on contaminated open-air sites.

Source:

Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB

(c) Fraunhofer IBMT
10.05.2023

Using textile electrodes to stop muscle tremor

Scientists at the Fraunhofer Institute for Biomedical Engineering IBMT have been working with international partners to develop a technology platform to help relieve the symptoms of muscle tremors. Tiny biocompatible electrodes in the muscles, combined with external electrodes and controllers, form an intelligent network of sensors and actuators to detect muscle signals and provide electrical stimuli as needed. Together with exoskeletons, the technology could also help people with spinal cord injuries.

Scientists at the Fraunhofer Institute for Biomedical Engineering IBMT have been working with international partners to develop a technology platform to help relieve the symptoms of muscle tremors. Tiny biocompatible electrodes in the muscles, combined with external electrodes and controllers, form an intelligent network of sensors and actuators to detect muscle signals and provide electrical stimuli as needed. Together with exoskeletons, the technology could also help people with spinal cord injuries.

A compact controller on a belt or under a jacket, a couple of discreet textile electrodes on the arms and legs, and electrodes three centimeters long and barely a millimeter thin in the muscle are all it will take to help people with tremor disorders in the future. Whenever muscle tremors start, the system sends electrical stimuli to the muscles; these stimuli are registered by the nervous system. The nervous system then stops sending interfering signals to the muscles, which settle down again. That is the basic idea behind the technology that scientists from Fraunhofer IBMT have been working on together with project partners by developing, manufacturing, integrating and experimentally testing a set of intramuscular and external electrodes and associated controllers.

The scientists have already made some concrete achievements. “We have managed to reduce muscle tremors significantly in trials with patients,” explains Andreas Schneider-Ickert, project manager for active implants and innovation manager.

The system is part of the EU-funded joint project “EXTEND.” A total of nine project partners from five different countries are working together to develop a versatile platform of distributed neural interfaces. The technology will be able to help people with neuromuscular disorders, such as tremors, or symptoms of paralysis. Even people with spinal cord injuries could benefit from this. The technology uses external controllers to link the implanted electrodes into an intelligent network. The components communicate with each other wirelessly, exchange data, detect muscle signals and send targeted stimuli into the muscles. Implanted systems are already being used medically to provide stimulation, but the current methods require complex surgical operations that are considerably stressful for patients.

Implants for the human-machine interface
A key element of EXTEND is the implants, which are made from biocompatible platinum-iridium and silicone and are injected into the muscle through a catheter. Just three centimeters long and barely a millimeter in diameter, the tiny implant has an electrode at each end that functions as either a sensor or an actuator. External electrodes sewn into a textile ribbon supply the module with energy. This sends pulsed alternating current through the muscle tissue to the implant. “What’s innovative about this is not only the intelligent interplay between control electronics, sensors and actuators, but also the principle of modulating the alternating current to transmit data,” explains Schneider-Ickert.

Once it has been implanted and started, the sensors register the first signs of muscle tremors and pass the information on to the external components. The controller evaluates the data and sends signals through the textile electrodes to stimulate the muscle. This closes a control circuit of intelligently networked sensor and actuator components that counteracts the tremor.

The stimulus signal is not strong enough to trigger a muscle contraction directly. It is the nervous system that plays the decisive role here. This registers the stimulation in the muscle tissue and responds by stopping the commands that trigger the muscle tremor. At least that is the theory — the finer details of the relationship between tremors and signals from the nervous system are yet to be researched. “In clinical trials, however, our method is working astonishingly well. Initial trials have shown that providing the patient with stimuli for one or two hours is enough to reduce tremor symptoms for a longer period of time,” says Schneider-Ickert.

Since tremors often occur in both arms and both legs, implants can be injected and external textile electrodes placed in all the affected muscle groups. This creates a distributed sensor network. The controllers can keep track of all the implanted and external electrodes at the same time and control them in coordination with each other. All this happens in real time, with the person experiencing no delay at all.

The technology being developed in the EXTEND joint project is just as functional as conventional implant systems, but minimally invasive and therefore easier to accept and better for everyday use. The basic concept originates from a Spanish project partner. Based in this concept, the researchers at Fraunhofer IBMT designed the electrodes and implantable components and produced and integrated them in the in-house cleanroom. The scientists have 25 years of expertise in neuroprosthetics and active implants.

Exoskeletons to prevent paraplegia
For tremor patients, EXTEND brings them the hope that their symptoms can be alleviated considerably. However, the technology platform could also help people with spinal cord injuries thanks to motorized exoskeletons. This is a possible because, in cases of paralysis, the nerve fibers are often not completely cut off. They can still transmit stimuli from the brain, albeit very weakly. The sensors register the activity and transmit it to the controller, which analyzes all the signals, works out what movement the person wants to perform and activates exactly the right prostheses to support the muscles in executing the movement.

Following initial successful tests, the concepts and technologies used in EXTEND have been steadily developed, miniaturized, optimized and subjected to further implementation studies. As a result, the project has now been completed with a successful proof of concept of the miniaturized full system in humans. Fraunhofer IBMT will use the knowledge gained from EXTEND to further develop its expertise in the field of neuromuscular and neural interfaces.

Source:

Fraunhofer Institute for Biomedical Engineering IBMT

Fibroblasts (connective tissue cells) on the electrospun Renacer® membrane under the confocal microscope (red: cytoskeleton of the cells, blue: cell nuclei). (c) Fraunhofer-Institut für Silicatforschung ISC
02.05.2023

Bioresorbable membrane: depot for active substances

Fraunhofer researchers have succeeded in using the bioresorbable silica gel Renacer® to produce an electrospun membrane that is neither cytotoxic to cells nor genotoxic. This model mimics fibrous structures found in connective tissue and is therefore particularly suitable for regenerative applications, such as for improved wound healing.
 
The treatment of large as well as internal wounds is challenging and can be a very lengthy process. Researchers at the Fraunhofer Institute for Silicate Research ISC and the Fraunhofer Institute for Toxicology and Experimental Medicine ITEM have developed a bioresorbable membrane for this use. This membrane supports wound healing and biodegrades completely in the body to a natural substance.

Fraunhofer researchers have succeeded in using the bioresorbable silica gel Renacer® to produce an electrospun membrane that is neither cytotoxic to cells nor genotoxic. This model mimics fibrous structures found in connective tissue and is therefore particularly suitable for regenerative applications, such as for improved wound healing.
 
The treatment of large as well as internal wounds is challenging and can be a very lengthy process. Researchers at the Fraunhofer Institute for Silicate Research ISC and the Fraunhofer Institute for Toxicology and Experimental Medicine ITEM have developed a bioresorbable membrane for this use. This membrane supports wound healing and biodegrades completely in the body to a natural substance.

The basis for the novel membrane is a fiber fleece developed at Fraunhofer ISC. This fleece has already been approved as a medical device to support the regeneration of chronic wounds, such as the diabetic foot. During the healing process, the material dissolves completely within six to eight weeks. Using the electrospinning method, the researchers have now managed to reduce the 50-micrometer fiber diameter by a factor of more than 50, resulting in fibers with diameters of less than one micrometer (µm). This made it possible to spin a silica gel sol into an open-meshed silica gel membrane consisting of fibers with a diameter of about one µm. In some cases, the diameters achieved were as small as 100 nanometers. “These fiber systems imitate the extracellular matrix, the fiber structures found in connective tissue, in the body and are very well tolerated by human cells for tissue regeneration. They cause no foreign body reactions and no internal scarring. The innovative silica gel membrane releases only one degradation product, ortho-silicic acid. This has a regenerative effect on the tissue and promotes the closing of wounds,” explains Dr. Bastian Christ, a scientist at the Fraunhofer ISC in Würzburg. Together with his colleagues, he was in charge of the synthesis and processing of the material.
 
“While the original fiber fleece of 50 µm thick fibers is inserted into a chronic wound from the outside, the thinner fiber fleece is also suitable for internal use. Theoretically, it could be placed onto the filler material used for bone defects in the jaw to accelerate wound healing,” is how Dr. Christina Ziemann, research scientist at Fraunhofer ITEM responsible for the biological evaluation of the material, describes one of numerous possible applications. “In principle, the membrane can be glued in the body with biodegradable adhesives.

Material is neither cyto- nor genotoxic
Using a confocal microscope, a special light microscope, it was possible to show that the small-meshed membrane, which serves as a demonstrator, exhibits a barrier function. This prevents the passage of connective tissue cells for a period of at least seven days without interfering with cell proliferation. In addition, the membrane is resorbable, is not cyto- or genotoxic and thus causes no direct damage to tissue or DNA.

Fiber diameter and mesh size influence the behavior of the cells
A thin fiber diameter of 100 nanometers with thin meshes was chosen for use as an adhesion barrier to prevent postoperative adhesions and scarring. With this configuration, only nutrients could pass through the fiber fleece, but connective tissue cells could not. With a fiber diameter of one micrometer and correspondingly wider meshes, on the other hand, the cells grow into the fiber mesh, proliferate there and have a regenerating effect on the surrounding tissue. “By adjusting the material properties, such as fiber diameter and mesh size, it is possible to influence the behavior of the cells as desired,” says Christ. The equipment required for spinning the fibers is designed at Fraunhofer ISC to meet application and specific customer requirements. The shape and size of the fiber fleeces can also be adjusted to customer specifications.

Wounds only heal quickly and effectively if the wounded tissue is sufficiently supplied with nutrients. At the same time, metabolic products have to be removed. In contrast to many products on the market that allow nutrient transport only after biodegradation has started, the open-meshed Renacer® membrane promotes this transport directly after implantation, while not allowing cell passage.

Membrane with an inorganic character
There is another advantage: The Renacer® membrane dissolves completely into almost pH neutral non-toxic ortho-silicic acid, the only water-soluble form of silica. It is physiologically present in the body and has been shown to stimulate connective skin tissue formation and bone formation. Products currently available do not exhibit such bioactive properties. Many biodegradable materials dissolve into organic acids, such as lactic acid or glycolic acid. This can cause local acidification in the tissue, which then triggers inflammatory reactions of the immune system. “Our tests have shown that the dissolution product, ortho-silicic acid, is also non-toxic and completely biocompatible with cells,” says Ziemann. “The membrane decomposes into a single molecule – ortho-silicic acid.”

Fibers as a depot for active substances
Furthermore, drugs can be encapsulated into the matrix of the silica gel fibers, to be released during material resorption. “For example, antibiotics could be delivered into a wound after applying a drug-loaded Renacer® membrane to prevent the formation of bacterial colonies,” elaborates Christ. At Fraunhofer ISC, the BMBF-funded GlioGel project is testing whether the Renacer® material platform can be used as a depot for active substances in the treatment of brain tumors.

Source:

Fraunhofer-Institut für Silicatforschung ISC

(c) Fraunhofer WKI
19.04.2023

Sustainable natural-fiber reinforcement for textile-reinforced concrete components

Textile-reinforced concrete components with a sustainable natural-fiber reinforcement possess sufficient bond and tensile load-bearing behavior for the utilization in construction. This has been verified by researchers at the Fraunhofer WKI in collaboration with Biberach University of Applied Sciences and the industrial partner FABRINO. In the future, textile-reinforced components with natural-fiber reinforcement could therefore replace conventionally reinforced concrete components and improve the environmental balance in the construction industry.

Textile-reinforced concrete components with a sustainable natural-fiber reinforcement possess sufficient bond and tensile load-bearing behavior for the utilization in construction. This has been verified by researchers at the Fraunhofer WKI in collaboration with Biberach University of Applied Sciences and the industrial partner FABRINO. In the future, textile-reinforced components with natural-fiber reinforcement could therefore replace conventionally reinforced concrete components and improve the environmental balance in the construction industry.

Non-metallic reinforcements for concrete elements are currently often made from various synthetically produced fibers - for example from glass or carbon fibers. An ecological alternative to synthetic fibers is provided by flax or other natural fibers. These are widely available and are more sustainable, due, amongst other things, to their renewable raw-material basis, the advantages regarding recycling, and the lower energy requirements during production. This is where the researchers from the Fraunhofer WKI and Biberach University of Applied Sciences, in collaboration with an industrial partner, became active. Their goal was to demonstrate that reinforcements made from textile fibers are just as suitable for utilization in construction as synthetic fibers.

"At the Fraunhofer WKI, we have produced leno fabrics from flax-fiber yarn using a weaving machine. In order to enhance sustainability, we tested a treatment of the flax yarns for improving the tensile strength, durability and adhesion which is ecologically advantageous compared to petro-based treatments," explained Jana Winkelmann, Project Manager at the Fraunhofer WKI. In the coating process, a commonly used petro-based epoxy resin was successfully replaced by a partially bio-based impregnation. A large proportion (56%) of the molecular structure of the utilized epoxy resin consists of hydrocarbons of plant origin and can therefore improve the CO2 balance.

Textile reinforcements have a number of fundamental advantages. They exhibit, for example, significantly reduced corrodibility at the same or higher tensile strength than steel, with the result that the necessary nominal dimension of the concrete covering can be reduced. This often allows smaller cross-sections to be required for the same load-bearing capacity. Up to now, however, the load-bearing behavior of textile reinforcements made from natural fibers in concrete components has not been systematically investigated.

At Biberach University of Applied Sciences, researchers tested the bond and tensile load-bearing behavior as well as the uniaxial flexural load-bearing behavior of concrete components with textile reinforcement made from flax fibers. The scientists came to the conclusion that the natural-fiber-based textile-reinforced components with a bio-based impregnation are fundamentally suitable. The suitability was demonstrated by both a significant increase in the breaking load compared to non-reinforced and under-reinforced concrete components and in finely distributed crack patterns. The curves of the stress-strain diagrams could be divided into three ranges typical for reinforced expansion elements (State I - non-cracked, State IIa - initial cracking, and State IIb - final crack pattern). The delineation of the ranges becomes more pronounced as the degree of reinforcement increases.

As a whole, regionally or Europe-wide available, renewable natural fibers and a partially bio-based coating contribute towards an improvement of the CO2 footprint of the construction industry. As a result, a further opportunity is being opened up for the energy- and raw-material-intensive construction industry in terms of meeting increasingly stringent environmental and sustainability requirements. "Textile-reinforced concretes enable lighter and more slender structures and therefore offer architectural leeway. We would like to continue our research into the numerous application possibilities of natural-fiber-reinforced concretes," said Christina Haxter, a staff member at the Fraunhofer WKI.

The project, which ran from 9th December 2020 to 31st December 2022, was funded by the German Federal Environmental Foundation (DBU).   

Photo Pixabay
10.01.2023

Fraunhofer: Optimized production of nonwoven masks

Producing infection control clothing requires a lot of energy and uses lots of material resources. Fraunhofer researchers have now developed a technology which helps to save materials and energy when producing nonwovens. A digital twin controls key manufacturing process parameters on the basis of mathematical modeling. As well as improving mask manufacturing, the ProQuIV solution can also be used to optimize the production parameters for other applications involving these versatile technical textiles, enabling manufacturers to respond flexibly to customer requests and changes in the market.

Producing infection control clothing requires a lot of energy and uses lots of material resources. Fraunhofer researchers have now developed a technology which helps to save materials and energy when producing nonwovens. A digital twin controls key manufacturing process parameters on the basis of mathematical modeling. As well as improving mask manufacturing, the ProQuIV solution can also be used to optimize the production parameters for other applications involving these versatile technical textiles, enabling manufacturers to respond flexibly to customer requests and changes in the market.

Nonwoven infection control masks were being used in their millions even before the COVID-19 pandemic and are regarded as simple mass-produced items. Nevertheless, the manufacturing process used to make them needs to meet strict requirements regarding precision and reliability. According to DIN (the German Institute for Standardization), the nonwoven in the mask must filter out at least 94 percent of the aerosols in the case of the FFP-2 mask and 99 percent in the case of the FFP-3 version. At the same time, the mask must let enough air through to ensure that the wearer can still breathe properly. Many manufacturers are looking for ways to optimize the manufacturing process. Furthermore, production needs to be made more flexible so that companies are able to process and deliver versatile nonwovens for a wide range of different applications and sectors.

ProQuIV, the solution developed by the Fraunhofer Institute for Industrial Mathematics ITWM in Kaiserslautern, fulfills both of these aims. The abbreviation “ProQuIV” stands for “Production and Quality Optimization of Nonwoven Infection Control Clothing” (Produktions- und Qualitätsoptimierung von Infektionsschutzkleidung aus Vliesstoffen). The basic idea is that manufacturing process parameters are characterized with regard to their impact on the uniformity of the nonwoven, and this impact is then linked to properties of the end product; for example, a protective mask. This model chain links all relevant parameters to an image analysis and creates a digital twin of the production process. The digital twin enables real-time monitoring and automatic control of nonwoven manufacturing and thus makes it possible to harness potential for optimization.

Dr. Ralf Kirsch, who works in the Flow and Material Simulation department and heads up the Filtration and Separation team, explains: “With ProQuIV, the manufacturers need less material overall, and they save energy. And the quality of the end product is guaranteed at all times.”

Nonwoven manufacturing with heat and air flow
Nonwovens for filtration applications are manufactured in what is known as the
meltblown process. This involves melting down plastics such as polypropylene and forcing them through nozzles so they come out in the form of threads referred to as filaments. The filaments are picked up on two sides by air flows which carry them forward almost at the speed of sound and swirl them around before depositing them on a collection belt. This makes the filaments even thinner: By the end of the process, their thickness is in the micrometer or even submicrometer range. They are then cooled, and binding agents are added in order to create the nonwoven. The more effectively the temperature, air speed and belt speed are coordinated with each other, the more uniform the distribution of the fibers at the end and therefore the more homogeneous the material will appear when examined under a transmitted light microscope. Lighter and darker areas can thereby be identified — this is referred to by experts as cloudiness. The Fraunhofer team has developed a method to measure a cloudiness index on the basis of image data. The light areas have a low fiber volume ratio, which means that they are less dense and have a lower filtration rate. Darker areas have a higher fiber volume and therefore a higher filtration rate. On the other hand, the higher air flow resistance in these areas means that they filter a smaller proportion of the air that is breathed in. A larger proportion of the air flows through the more open areas which have a less effective filtration effect.

Production process with real-time control
In the case of ProQuIV, the transmitted light images from the microscope are used to calibrate the models prior to use. The experts analyze the current condition of the textile sample and use this information to draw conclusions about how to optimize the system — for example, by increasing the temperature, reducing the belt speed or adjusting the strength of the air flows. “One of the key aims of our research project was to link central parameters such as filtration rate, flow resistance and cloudiness of a material with each other and to use this basis to generate a method which models all of the variables in the production process mathematically,” says Kirsch. The digital twin monitors and controls the ongoing production process in real time. If the system deviates slightly from where it should be — for example, if the temperature is too high — the settings are corrected automatically within seconds.

Fast and efficient manufacturing
“This means that it is not necessary to interrupt production, take material samples and readjust the machines. Once the models have been calibrated, the manufacturer can be confident that the nonwoven coming off the belt complies with the specifications and quality standards,” explains Kirsch. ProQuIV makes production much more efficient — there is less material waste, and the energy consumption is also reduced. Another advantage is that it allows manufacturers to develop new nonwoven-based products quickly — all they have to do is change the target specifications in the modeling and adjust the parameters. This enables production companies to respond flexibly to customer requests or market trends.

This might sound logical but can be quite complex when it comes to development. The way that the values for filtration performance and flow resistance increase, for example, is not linear at all, and they are not proportional to the fiber volume ratio either. This means that doubling the filament density does not result in double the filtration performance and flow resistance — the relationship between the parameters is much more complex than that. “This is precisely why the mathematical modeling is so important. It helps us to understand the complex relationship between the individual process parameters,” says ITWM researcher Kirsch. The researchers are able to draw on their extensive expertise in simulation and modeling for this work.

More applications are possible
The next step for the Fraunhofer team is to reduce the breathing resistance of the nonwovens for the wearer without impairing the protective effect. This is made possible by electrically charging the fibers and employing a principle similar to that of a feather duster. The electric charge causes the textile fabric to attract the tiniest of particles which could otherwise slip through the pores. For this purpose, the strength of the electrostatic charge is integrated into the modeling as a parameter.

The Fraunhofer researchers’ plans for the application of this method extend far beyond masks and air filters. Their technology is generally applicable to the production of nonwovens — for example, it can also be used in materials for the filtration of liquids. Furthermore, ProQuIV methods can be used to optimize the manufacture of nonwovens used in sound-insulating applications.

Source:

Fraunhofer Institute for Industrial Mathematics ITWM

Submarine sensors have lots to tell us about the situation below the surface. Fraunhofer IZM has mounted sensor systems on the two manta ray fins of the unmanned underwater vehicle designed by EvoLogics. (c) EvoLogics GmbH
11.10.2022

Textile Skin & Smart Sensors: Robo-Ray in Search of Munitions

Giant arsenals of unexploded ordinance are sitting on the ocean floor, lost in battle or dumped as waste. The risky job of detecting these underwater hazards is currently given to submarines specially fitted for the purpose. But even they cannot get to some of the tighter or harder to reach spots, forcing expert divers to go down and take over the often life-threatening work.

A German research consortium including Fraunhofer IZM is now using a submarine robot that is as nimble and mobile as a manta ray and equipped with innovative connected sensors on its fins to gather more information about its surroundings. It can measure water pressure so precisely that metal objects can be detected on the ocean floor, even if they are covered by sediment.

Giant arsenals of unexploded ordinance are sitting on the ocean floor, lost in battle or dumped as waste. The risky job of detecting these underwater hazards is currently given to submarines specially fitted for the purpose. But even they cannot get to some of the tighter or harder to reach spots, forcing expert divers to go down and take over the often life-threatening work.

A German research consortium including Fraunhofer IZM is now using a submarine robot that is as nimble and mobile as a manta ray and equipped with innovative connected sensors on its fins to gather more information about its surroundings. It can measure water pressure so precisely that metal objects can be detected on the ocean floor, even if they are covered by sediment.

Unmanned underwater vehicles or UUVs have been in use for several years, but high-tech pioneers for reliable underwater communication and innovative bionics like EvoLogics GmbH have let themselves be inspired by marine life like manta rays and adapted their look and technical anatomy to the submarine world.

With the enormous “wingspan” of their fins, manta rays are known to cover vast distances, while their extremely flexible vertebrae means that they can make surprisingly sharp turns on their seemingly weightless journey through the sea. Their robotic cousins can be very agile as well, but they were not smart enough yet to replace the professional divers who had to scour the sea floor for hours, looking for lost ordinance from the First or Second World War or other hazardous metal waste before offshore wind farms could be built or intercontinental cables could be put down. Now, the new robo ray will make it possible to detect submarine hazards with a whole battery of sensors.

The “Bionic RoboSkin” project, supported by Germany’s Ministry of Education and Research, is working to give the manta-shaped UUVs a flexible bionic sensor skin to help them navigate their underwater world. The skin is made from a compound fabric that is fitted with sensor elements and water-resistant connectors to supply the sensors with power and transmit their data. Researchers from Fraunhofer IZM have taken on the challenge of developing these integrated sensor modules with which the UUVs can detect touch or the proximity of objects and virtually see and analyze their surroundings. The project consortium is headed by EvoLogics GmbH and includes other experts in the field from TITV Greiz, Sensorik Bayern GmbH, the diving specialists of BALTIC Taucherei- und Bergungsbetrieb Rostock GmbH, and GEO-DV GmbH, all with one mission: To create a new generation of robots that can support their human partners with a range of semi or fully automated services and functions.

Their capabilities will not be limited to the sea: The researchers are looking at a second use case for a land-based robot sensor platform, fittingly called “Badger” or “Dachs” in German. It will navigate by GPS and be fitted with ground penetrating radar to detect metal objects below ground or conduct other ground survey work in harder to reach places (including tunneling work).

Under the robotic manta ray’s deceptively lifelike shell lies intricate technology: A permeable and therefore pressure-neutral fabric skin is created and fitted with integrated microelectronics for touch, flow, motion, and position sensors. This textile skin is then pulled tight over the robotic fins, creating a soft robotics machine that can sense its surroundings. The team at Fraunhofer IZM is responsible for the electronics that make this possible: They developed sensor nodes suitable for submersible use that can collect and pre-process the sensor data. These nodes do not only have to be fit for purpose, they also need to be extremely miniaturized to fit underneath the thin fabric skin and integrate the necessary connectors. In active operations below the waterline, these sensors can track parameters like acceleration, pressure, or absorbency. The researchers also included LEDs in the circuit board design that let the robotic manta rays communicate with human divers, for instance to signal a turn.

All of these components and sensor packages are integrated by means of a highly miniaturized embedding method and protected from the cold and wet environment by a robust case. Despite this, the footprint of the embedded modules is amazingly small at 23 x 10.5 x 1.6 mm³, fitting a complete sensor package and microcontroller in something the size of a common door key. The case itself works as a conductor by creating the mechanical and electrical contact with the sensor skin itself. The researchers chose a modular two-part design from their original vision of the product: The embedding module combines the individual electronic components on a millimeter scale for exceptional integration; the module case acts as the mechanical interface with the skin and makes the system as robust as it has to be for its destined purpose. The coupling between module and case relies on a seemingly simple clipping action: Small pins on the connector surface on the skin and tiny hooks on the sensor module itself snap together to form an easily de- and attachable interface. The resulting system is modular to allow easy reconfiguration.

The researchers at Fraunhofer IZM will now subject their robotic manta ray to a series of tests with their project partners. The results and findings from the “Bionic RoboSkin” project will likely be of use for many other projects and contribute to more pressure-neutral and reliable packaging solutions for flexible, mobile, and smarter service robots.

The “Bionic RoboSkin” project is supported through the VDI/VDE-IT by the Ministry of Education and Research (funding code 16ES0914) as part of the federal government’s research and innovation campaign 2016 to 2020 “Microelectronics from Germany – Driver of Innovation for the Digital Economy”.

Source:

Fraunhofer Institute for Reliability and Microintegration IZM

First tests with free-form tiles made of wood short fiber filament. (Photo: LZH) Photo: LZH. First tests with free-form tiles made of wood short fiber filament.
19.09.2022

Sustainability in 3D Printing: Components made of Natural Fibers

3D printing has been in use in architecture for a while, and now it is to become ecologically sustainable as well: Together with partners, the LZH is researching how to produce individual building elements from natural fibers using additive manufacturing.

3D printing has been in use in architecture for a while, and now it is to become ecologically sustainable as well: Together with partners, the LZH is researching how to produce individual building elements from natural fibers using additive manufacturing.

In the project 3DNaturDruck, architectural components such as facade elements shall be created from natural fiber-reinforced biopolymers in 3D printing. To this end, the scientists will develop the corresponding composite materials from biopolymers with both natural short fibers and natural continuous fibers and optimize them for processing with the additive manufacturing process FDM (Fused Deposition Modeling). The project partners' goal is to enable smart and innovative designs that are both ecological and sustainable.
 
The goal: highly developed components made from sustainable materials
Within the project, different natural fiber-reinforced biopolymer composites will be investigated. The partners are researching both processing methods with very short natural fibers, such as from wood and straw, and a method for printing continuous fibers from hemp and flax in combination with biopolymers. The LZH then develops processes for these new materials and adapts the tools and nozzle geometries of the FDM printer. A pavilion with the 3D-printed facade elements is planned as a demonstrator on the campus of the University of Stuttgart.
 
The project partners want to explore how additive manufacturing can be used to simplify manufacturing processes for architectural components. Natural fiber-reinforced biopolymers are particularly suitable for producing components with complex geometries in just a few steps and with low material and cost requirements. With their research, the partners are also working on completely new starting conditions for the fabrication of newly developed architectural components: For example, the topology optimization of components according to their structural stress can be easily implemented with additive manufacturing.

Enabling the natural fiber trend in architecture also using additive manufacturing
There is great interest in the use of natural fibers in structural components in architecture and construction because natural fibers have several advantages. They have good mechanical properties combined with low weight and are widely available. As a renewable resource with in some cases very short renewal cycles, they are also clearly a better ecological alternative than synthetic fibers.

In additive manufacturing, large-format elements for the architectural sector have so far mostly been manufactured with polymers based on fossil raw materials. Research in the project 3DNaturDruck should now make the use of natural fibers in architecture possible for additive manufacturing as well.

About 3DNaturDruck
The project 3DNaturDruck is about the design and fabrication of 3D-printed components made of biocomposites using filaments with continuous and short natural fibers.

The project is coordinated by the Department of Biobased Materials and Materials Cycles in Architecture (BioMat) at the Institute of Building Structures and Structural Design (ITKE) at the University of Stuttgart. In addition to the LZH, project partners include the Fraunhofer Institute for Wood Research Wilhelm-Klauditz-Institut (WKI) and the industrial companies Rapid Prototyping Technologie GmbH (Gifhorn), ETS Extrusionstechnik (Mücheln), 3dk.berlin (Berlin) and ATMAT Sp. Z o.o. (Krakow, Poland).

The project is funded by the German Federal Ministry of Food and Agriculture through the Fachagentur Nachwachsende Rohstoffe e.V. under the funding code 2220NR295C.

Source:

Laser Zentrum Hannover e.V.

(c) Fraunhofer IKTS
02.08.2022

Fraunhofer technology: High-tech vest monitors lung function

Patients with severe respiratory or lung diseases require intensive treatment and their lung function needs to be monitored on a continuous basis. As part of the Pneumo.Vest project, Fraunhofer researchers have developed a technology whereby noises in the lungs are recorded using a textile vest with integrated acoustic sensors. The signals are then converted and displayed visually using software. In this way, patients outside of intensive care units can still be monitored continuously. The technology increases the options for diagnosis and improves the patient’s quality of life.

For over 200 years, the stethoscope has been a standard tool for doctors and, as such, is a symbol of the medical profession. In television hospital dramas, doctors are seen rushing through the halls with a stethoscope around their neck. Experienced doctors do indeed use them to listen very accurately to heartbeats and the lungs and, as a result, to diagnose illnesses.

Patients with severe respiratory or lung diseases require intensive treatment and their lung function needs to be monitored on a continuous basis. As part of the Pneumo.Vest project, Fraunhofer researchers have developed a technology whereby noises in the lungs are recorded using a textile vest with integrated acoustic sensors. The signals are then converted and displayed visually using software. In this way, patients outside of intensive care units can still be monitored continuously. The technology increases the options for diagnosis and improves the patient’s quality of life.

For over 200 years, the stethoscope has been a standard tool for doctors and, as such, is a symbol of the medical profession. In television hospital dramas, doctors are seen rushing through the halls with a stethoscope around their neck. Experienced doctors do indeed use them to listen very accurately to heartbeats and the lungs and, as a result, to diagnose illnesses.

Now, the stethoscope is getting some help. As part of the Pneumo.Vest project, researchers of the Fraunhofer Institute for Ceramic Technologies and Systems IKTS at the Berlin office have developed a textile vest with integrated acoustic sensors, presenting a high-performance addition to the traditional stethoscope. Piezoceramic acoustic sensors have been incorporated into the front and back of the vest to register any noise produced by the lungs in the thorax, no matter how small. A software program records the signals and electronically amplifies them, while the lungs are depicted visually on a display. As the software knows the position of each individual sensor, it can attribute the data to its precise location. This produces a detailed acoustic and optical picture of the ventilation situation of all parts of the lungs. Here is what makes it so special: As the system collects and stores the data permanently, examinations can take place at any given time and in the absence of hospital staff. Pneumo.Vest also indicates the status of the lungs over a period of time, for example over the previous 24 hours. Needless to say, traditional auscultation can also be carried out directly on the patients. However, instead of carrying out auscultation manually at different points with a stethoscope, a number of sensors are used simultaneously.

“Pneumo.Vest is not looking to make the stethoscope redundant and does not replace the skills of experienced pneumologists. However, auscultation or even CT scans of the lungs only ever present a snapshot at the time of the examination. Our technology provides added value because it allows for the lungs to be monitored continuously in the same way as a long-term ECG, even if the patient is not attached to machines in the ICU but has instead been admitted to the general ward,” explains Ralf Schallert, project manager at Fraunhofer IKTS.

Machine learning algorithms aid with diagnosis
Alongside the acoustic sensors, the software is at the core of the vest. It is responsible for storing, depicting and analyzing the data. It can be used by the doctor to view the acoustic events in specific individual areas of the lungs on the display. The use of algorithms in digital signal processing enables a targeted evaluation of acoustic signals. This means it is possible, for example, to filter out heartbeats or to amplify characteristic frequency ranges, making lung sounds, such as rustling or wheezing, much easier to hear.

On top of this, the researchers at Fraunhofer IKTS are developing machine learning algorithms. In the future, these will be able to structure and classify complex ambient noises in the thorax. Then, the pneumologist will carry out the final assessment and diagnosis.

Discharge from the ICU
Patients can also benefit from the digital sensor alternative. When wearing the vest, they can recover without requiring constant observation from medical staff. They can transfer to the general ward and possibly even be sent home and move about more or less freely. Despite this, the lungs are monitored continuously, and any sudden deterioration can be reported to medical personnel straight away.

The first tests with staff at the University Clinic for Anesthesiology and Intensive Therapy at the University of Magdeburg have shown that the concept is successful in practice. “The feedback from doctors was overwhelmingly positive. The combination of acoustic sensors, visualization and machine learning algorithms will be able to reliably distinguish a range of different lung sounds,” explains Schallert. Dr. Alexander Uhrig from Charité – Universitätsmedizin Berlin is also pleased with the technology. The specialist in infectiology and pneumology at the renowned Charité hospital was one of those who initiated the idea: “Pneumo.Vest addresses exactly what we need. It serves as an instrument that expands our diagnostic options, relieves the burden on our hospital staff and makes hospital stays more pleasant for patients.”

The technology was initially designed for respiratory patients, but it also works well for people in care facilities and for use in sleep laboratories. It can also be used to train young doctors in auscultation.

Increased need for clinical-grade wearables
With Pneumo.Vest, the researchers at Fraunhofer IKTS have developed a product that is cut out for the increasingly strained situation at hospitals. In Germany, 385,000 patients with respiratory or lung diseases require inpatient treatment every year. Over 60 percent are connected to a ventilator for more than 24 hours. This figure does not account for the current increase in respiratory patients due to the COVID-19 pandemic. As a result of increasing life expectancy, the medical industry also expects the number of older patients with breathing problems to increase. With the help of technology from Fraunhofer IKTS, the burden on hospitals and, in particular, costly ICUs can be relieved as their beds will no longer be occupied for quite as long.

It should be added that the market for such clinical-grade wearables is growing rapidly. These are compact medical devices that can be worn directly on the body to measure vital signs such as heartbeat, blood oxygen saturation, respiratory rate or skin temperature. As a medical device that can be used flexibly, Pneumo.Vest fits in perfectly with this development. But do not worry: Doctors will still be using the beloved stethoscope in the future.

Fraunhofer “M³ Infekt” cluster project
Pneumo.Vest is just one part of the extensive M³ Infekt cluster project. Its objective is to develop monitoring systems for the decentralized monitoring of patients. The current basis of the project is the treatment of COVID-19 patients. With the SARS-CoV2 virus, it is common for even mild cases to suddenly deteriorate significantly. By continuously monitoring vital signs, any deterioration in condition can be quickly identified and prompt measures for treatment can be taken.

M3 Infekt can also be used for a number of other symptoms and scenarios. The systems have been designed to be modular and multimodal so that biosignals such as heart rate, ECG, oxygen saturation, or respiratory rate and volume can be measured, depending on the patient and illness.

A total of ten Fraunhofer institutes are working on the cluster project under the leadership of the Fraunhofer Institute for Integrated Circuits IIS in Dresden. Klinikum Magdeburg, Charité – Universitätsmedizin Berlin and the University Hospitals of Erlangen and Dresden are involved as clinical partners.

Source:

Fraunhofer Institute for Ceramic Technology and Systems IKTS

Photo: Pixabay
28.06.2022

Individual plastic budget - Fraunhofer UMSICHT presents study results

When plastics enter the environment, this brings with it many negative effects: these range from suffocating living organisms to transfer within the food chain and physical effects on an ecosystem. In addition, there are dangers from the release of additives, monomers and critical intermediates of metabolic processes, the metabolites.

How great the long-term impact of plastic emissions actually is, is not yet clear at the present time. In order to create a political decision-making basis for dealing with plastic emissions, researchers from Fraunhofer UMSICHT and the Ruhr University Bochum have therefore developed a budget approach and an LCA impact assessment methodology in the "PlastikBudget" project from December 2017 to the end of August 2021. The researchers have now completed the project. The result: When driving a car, a person emits more than half of their individual plastic emission budget through tire wear.

When plastics enter the environment, this brings with it many negative effects: these range from suffocating living organisms to transfer within the food chain and physical effects on an ecosystem. In addition, there are dangers from the release of additives, monomers and critical intermediates of metabolic processes, the metabolites.

How great the long-term impact of plastic emissions actually is, is not yet clear at the present time. In order to create a political decision-making basis for dealing with plastic emissions, researchers from Fraunhofer UMSICHT and the Ruhr University Bochum have therefore developed a budget approach and an LCA impact assessment methodology in the "PlastikBudget" project from December 2017 to the end of August 2021. The researchers have now completed the project. The result: When driving a car, a person emits more than half of their individual plastic emission budget through tire wear.

How big is the long-term impact of plastic emissions?
Six percent of global petroleum consumption goes to the plastics industry - and the trend is rising. While the plastics industry is an important economic factor in many countries, more and more plastic waste ends up in soils and oceans. Mostly in the form of highly mobile, small to large plastic fragments, plastic emissions can no longer be recovered from the environment. At the same time, the long-term effects of plastic in the environment are hardly predictable.

Due to the global and cross-generational dimension of the problem, it is important that science, industry and consumers work together to find a solution. One goal of the joint project PlastikBudget is therefore to quantify today's plastic emissions and to derive a plastic emissions budget. On this basis, the researchers can formulate quantitative emission targets that can be used to legitimize political decisions. In particular, the path from empirically verified data and normative values to a concrete emissions budget forms the core objective of the project.

From research to per capita emissions budget
Starting with a basic research on plastic quantities in the environment, the project addresses two major topics: The development of a budget approach and the development of an impact assessment method that can be used in life cycle assessments to consider potential environmental impacts of plastic emissions. Participatory formats complete the project. In this way, the results are anchored in political and scientific discourse. In the course of the project, the researchers will answer the following questions: What quantities of plastic are currently being discharged and what quantities have already accumulated? What quantities of plastic in the environment are still acceptable? How long does it take for plastics to degrade in real environmental compartments? How are the risks posed by different plastic emissions adequately represented? Finally, from the answers, they calculate a value for current emissions and what they consider to be an acceptable emissions budget.

250 million tonnes of PPE for 7.8 billion people
To measure plastic pollution, the researchers in the PlastikBudget project have developed the persistence-weighted plastic emission equivalent (PPE for short). This represents a virtual mass that takes into account the period of time until a specific plastic emission is degraded, e.g. in soil, freshwater or seawater. Relevant properties for this are the location of the emission, the material type, the shape of the plastic emission as well as the size of the emitted plastic part and the final environmental compartment in which the plastic remains. In the case of plastics that degrade completely within one year, the plastic emission equivalent corresponds to the real mass. If the degradation time is longer, it increases accordingly.

"Based on the thesis that the total amount of plastics already accumulated in the environment today has just reached a critical quantity, we were able to calculate a global plastic emission budget of 250 million tonnes of PPE," explains Jürgen Bertling, project manager of the project and scientist at Fraunhofer UMSICHT. "If each of the 7.8 billion people is allocated the same emission rights, this results in an individual budget of 31.9 kilograms of PPE per person and year."

Driving consumes half of the individual plastic budget
However, tire wear from driving alone corresponds to a plastic emission equivalent of 16.5 kg PPE per year and thus consumes more than 50 per cent of an individual's budget. Even waste from ten coffee-to-go disposable cups would consume 13.5 kg of PPE per year, more than a third of one's budget. "This is because the plastics used in disposable cups are more difficult to degrade than the rubber in the tire," explains Jan Blömer from Fraunhofer UMSICHT, who played a key role in developing the calculation methodology. The consumption of a coil of polyamide for a lawn trimmer, which releases microplastics when used, also weighs in considerably at 5.1 kilograms of PPE. Microbeads in cosmetics or the one-time sanding of a front door, on the other hand, consume significantly less of the individual emissions budget with 1.1 kg PPE and 0.5 kg PPE, but are still quite relevant in the overall balance.

Many other everyday activities also lead to plastic emissions. Nevertheless, the researchers show that the calculated budget limits can be met in various scenarios. However, such a scenario also entails considerable effort and massive changes in the way we deal with plastics today. One possible scenario to meet the budget would be a reduction of emissions by more than 50 per cent, if at the same time at least 50 per cent of all emissions consisted of readily degradable plastics.

Further work on accounting for plastic emissions in life cycle assessments
The persistence-weighted plastic emission equivalent developed in the PlastikBudget project could also represent a new impact category in life cycle assessments in the future. "With the help of factors that reflect the persistence of plastics in the environment, it will be possible in future to compare different product alternatives in terms of their plastic emission footprints," says Dr Daniel Maga, who is coordinating the corresponding further development of the life cycle assessment methodology at Fraunhofer UMSICHT. A corresponding exchange with companies is taking place here. However, implementation in the life cycle assessment methodology and the associated software solutions requires broad acceptance in the scientific community and must be prepared in corresponding standardisation committees.

The project is part of the research priority "Plastics in the Environment" (PidU) of the Federal Ministry of Education and Research (BMBF), in which 18 collaborative projects with around 100 partners from science, industry, associations, municipalities and practice want to clarify fundamental questions about the production, use and disposal of plastics. The research focus "Plastics in the Environment - Sources, Shrinking, Solutions" is part of the Green Economy flagship initiative of the BMBF framework programme "Research for Sustainable Development" (FONA3).

Source:

Fraunhofer Institute for Environmental, Safety and Energy Technology UMSICHT

(c) MAI Carbon
24.05.2022

From waste to secondary raw material - wetlaid nonwovens made from recycled carbon fibers

MAI Scrap SeRO | From Scrap to Secondary Ressources – Highly Orientated Wet-Laid-Nonwovens from CFRP-Waste

The »Scrap SeRO« project is an international joint project in the field of »recycling of carbon fibers«.

The technical project goal is the demonstration of a continuous process route for processing pyrolytically recycled carbon fibers (rCF) in high-performance second-life component structures. In addition to the technological level, the focus of the project is particularly on the international transfer character, in the sense of a cross-cluster initiative between the top cluster MAI Carbon (Germany) and CVC (South Korea).

MAI Scrap SeRO | From Scrap to Secondary Ressources – Highly Orientated Wet-Laid-Nonwovens from CFRP-Waste

The »Scrap SeRO« project is an international joint project in the field of »recycling of carbon fibers«.

The technical project goal is the demonstration of a continuous process route for processing pyrolytically recycled carbon fibers (rCF) in high-performance second-life component structures. In addition to the technological level, the focus of the project is particularly on the international transfer character, in the sense of a cross-cluster initiative between the top cluster MAI Carbon (Germany) and CVC (South Korea).

Through direct cooperation between market-leading companies and research institutions of the participating cluster members, the technical project processing takes place in the context of the global challenge of recycling, as well as the need for increased resource efficiency, with reference to the economically strategic material carbon fibers.

Efficient processing of recycled carbon fibers
The technological process route within the project runs along the industrial wet-laying technology, which is comparable to classic paper production. This enables a robust production of high-quality rCF nonwovens, which are characterized, among other things, by particularly high homogeneity and stability of characteristic values.

A special development focus is on a specific process control, which allows the generation of an orientation of the individual fiber filaments in the nonwoven material.

The given preferred fiber direction of the discontinuous fiber structure opens up strong synergy effects in relation to increased packing densities, i.e. fiber volume content, as well as a significantly optimized processing behavior in relation to impregnation, forming and consolidation, in addition to a load path-oriented mechanics.

The innovative wetlaid nonwovens are then further processed into thermoset and thermoplastic semi-finished products, i.e. prepregs or organosheets, using impregnation processes that are suitable for large-scale production.

rCF tapes are produced from this in an intermediate slitting step. By means of automated fiber placement, load path-optimized preforms can be deposited, which are then consolidated into complex demonstrator components.

The process chain is monitored at key interfaces by innovative non-destructive measurement technology and supplemented by extensive characterization methods. Especially for the processing of pyrolysed recycled carbon fibers, which were recovered from end-of-life waste or PrePreg waste, for example, there are completely new potentials with significant added value compared to the current state of the art for the overall process route presented here.

International Transfer
The fundamentally global challenge of recycling and the striving for increased sustainability is strongly influenced by national recycling strategies as a result of country-specific framework conditions. The globalized way in which companies deal with high-volume material flows places additional demands on a functioning circular economy. A networked solution can only be created on the basis of and in compliance with the respective guidelines and structural factors.

In the case of the high-performance material carbon fiber, there is a particularly high technical requirement for an ecologically and economically viable recycling industry. At the same time, the specific market size already opens up interesting scaling effects and potential for market penetration.

The Scrap SeRO project connects two of the world's leading top clusters in the field of carbon composites from South Korea and Germany on the basis of a cross-cluster initiative. As part of this first promising technology project, the foundation stone for future cooperation is to be laid that supports the effective recycling of carbon fibers. The project makes an important contribution to closing the material cycle for carbon fibers and thus paves the way for renewed use in further life cycles of this high-quality and energy-intensive material.

Info »Scrap SeRO«

  • Duration: 05/2019 – 04/2022
  • Funding: BMBF
  • Funding Amount: 2.557.000 €

National Consortium

  • Fraunhofer Institute for Casting, Composite and Processing Technology IGCV
  • ELG Carbon Fibre
  • J.M. Voith SE & Co. KG
  • Neenah Gessner
  • SURAGUS GmbH
  • LAMILUX Composites GmbH
  • Covestro Deutschland AG
  • BA Composites GmbH
  • SGL Carbon

International Consortium

  • KCarbon
  • Hyundai
  • Sangmyung University
  • TERA Engineering
Source:

Fraunhofer Institute for Casting, Composite and Processing Technology IGCV

Photo: pixabay
17.05.2022

The industrial future needs climate-neutral process heat

IN4climate.NRW publishes discussion paper

Not only private households, but above all industrial companies have a high demand for heat. On the way to climate neutrality, greater focus must be placed on the supply of process heat to the industry - especially in the industrial state of North Rhine-Westphalia (NRW). This is shown by the discussion paper of the climate protection think tank IN4climate.NRW.

In 2020, process heat accounted for a large percentage of industrial energy demand - 67 percent of the energy consumed by German industry - and is still predominantly supplied by fossil fuels (BMWi 2021a). That's almost 20 percent of Germany's total energy demand. No wonder: Whether glass, metal, cement or paper are melted, forged, fired or dried - all these processes require process heat. And in some cases up to a temperature of 3,000 °C.

IN4climate.NRW publishes discussion paper

Not only private households, but above all industrial companies have a high demand for heat. On the way to climate neutrality, greater focus must be placed on the supply of process heat to the industry - especially in the industrial state of North Rhine-Westphalia (NRW). This is shown by the discussion paper of the climate protection think tank IN4climate.NRW.

In 2020, process heat accounted for a large percentage of industrial energy demand - 67 percent of the energy consumed by German industry - and is still predominantly supplied by fossil fuels (BMWi 2021a). That's almost 20 percent of Germany's total energy demand. No wonder: Whether glass, metal, cement or paper are melted, forged, fired or dried - all these processes require process heat. And in some cases up to a temperature of 3,000 °C.

In the discussion paper "Process heat for a climate-neutral industry (Prozesswärme für eine klimaneutrale Industrie)", IN4climate.NRW formulates approaches and recommendations for action for a process heat transition. A total of thirteen partners of the initiative have signed the paper.

Samir Khayat, Managing Director of NRW.Energy4-Climate: "The switch to sustainable process heat supply is one of the decisive factors in ensuring that the transformation of industry can succeed. With the IN4climate.NRW initiative, we are bringing together the expertise from science, politics as well as industry, and developing concrete strategies to put climate neutrality in industry into practice."

Various figures illustrate the need for action: Only 6 percent of the energy required for process heat has so far been covered by renewable energies. Electricity also currently accounts for only 8 percent - as an energy source, it is still far from emission-free in today's electricity mix, but must become so in the future through the switch to 100 percent renewables.

NRW alone needs 40 percent of the process heat required by the whole of Germany
Tania Begemann, Project Manager Industry and Production at NRW.Energy4Climate and author of the paper: "The sustainable conversion of process heat has always been an important and urgent topic at IN4climate.NRW, but it becomes even more explosive in times of a global energy crisis. It is estimated that NRW alone requires 40 percent of the process heat required by the whole of Germany. In order to remain economically strong and an industrial state in the long term, it is therefore of particular importance for NRW to become independent of fossil process heat sources in the near future. We would like to draw attention to this with this paper. At the same time, this enormous challenge also offers NRW the opportunity to become a pioneer."

How can this be accomplished? The discussion paper shows central approaches and recommendations for action:

  • Increase efficiency: The development and use of high-temperature heat pumps should be specifically promoted within the framework of pilot plants and concepts. In addition, companies should be supported in the development and implementation of concepts that minimize process temperatures and use waste heat within the company.
  • Promote renewable heat sources: Local, renewable energy sources such as deep geothermal energy and solar thermal energy can be an important component of climate-neutral process heat supply and at the same time reduce the reliance on energy imports. Where renewables can supply industrial heating needs, they should be used. These forms of energy should therefore be supported in a targeted manner through inquiries and tenders.
  • Increase renewable electricity: The electrification of processes and applications is the prerequisite for the energy transition. Expanding renewable power generation along with a solid power grid, creating competitive prices for green power, and developing flexible systems are therefore key tasks.
  • Promote storable alternative energy sources: To be able to generate process heat even when renewable energies are not available, industry needs large quantities of storable energy carriers. In particular, sustainable hydrogen must be available at competitive prices and the necessary conditions, such as a transport and storage infrastructure, must be created. In addition to hydrogen, biomass is a valuable and storable energy carrier and raw material at the same time. This limited resource must therefore be used in a targeted and efficient manner.

The climate-neutral generation of process heat is of great importance for the whole of Germany, but especially for the industrial state of North Rhine-Westphalia, and at the same time represents a major challenge. The heat transition in industry requires an overall systemic and supraregional view and strategy development. On the one hand, such strategies should take into account the interaction of different sectors. On the other hand, they should include all heat requirements - from buildings to industry. In this paper, decision-makers from politics, industry and society will find initial reference points and impulses for this important, common task.

The paper was developed by the IN4climate.NRW initiative under the umbrella of the NRW.Energy4Climate state organization. It is supported by the institutes Fraunhofer UMSICHT, RWTH Aachen (Chair of Technical Thermodynamics), the VDZ research institute as well as the Wuppertal Institute, the companies Amprion, Currenta, Deutsche Rohstofftechnik (German raw material technology - RHM Group), Georgsmarienhütte, Kabel Premium Pulp and Paper, Lhoist, Pilkington Germany (NSG Group) and Speira as well as the Federal Association of the German Glass Industry.

Source:

Fraunhofer Institute for Environmental, Safety and Energy Technology UMSICHT

(c) A3/Christian Strohmayr
10.05.2022

Fraunhofer reduces CO2 footprint and recycles trendy lightweight carbon material

Neo-ecology through innovative paper technology

To reduce the CO2 footprint, the Fraunhofer Institute for Casting, Composite and Processing Technology IGCV Augsburg research with a state-of-the-art wetlaid nonwoven machine for recycling carbon fibers. The production processes are similar to those of a paper manufacturing machine. The crucial difference: we turn not paper fibers into the paper but recycled carbon fibers into nonwoven roll fabrics. The carbon fiber thus gets a second life and finds an environmentally friendly way in nonwovens, such as door panels, engine bonnets, roof structures, underbody protection (automotive), and heat shields (helicopter tail boom), as well as in aircraft interiors.

“Wetlaid technology for processing technical fibers is currently experiencing a revolution following centuries of papermaking tradition.”
Michael Sauer, Researcher at Fraunhofer IGCV

Neo-ecology through innovative paper technology

To reduce the CO2 footprint, the Fraunhofer Institute for Casting, Composite and Processing Technology IGCV Augsburg research with a state-of-the-art wetlaid nonwoven machine for recycling carbon fibers. The production processes are similar to those of a paper manufacturing machine. The crucial difference: we turn not paper fibers into the paper but recycled carbon fibers into nonwoven roll fabrics. The carbon fiber thus gets a second life and finds an environmentally friendly way in nonwovens, such as door panels, engine bonnets, roof structures, underbody protection (automotive), and heat shields (helicopter tail boom), as well as in aircraft interiors.

“Wetlaid technology for processing technical fibers is currently experiencing a revolution following centuries of papermaking tradition.”
Michael Sauer, Researcher at Fraunhofer IGCV

The wetlaid technology used is one of the oldest nonwoven forming processes (around 140 BC - 100 AD). As an essential industry sector with diverse fields of application, wetlaid nonwovens are no longer only found in the classic paper. Instead, the application areas extend, for example, from adhesive carrier films, and packaging material, to banknotes and their process-integrated watermarks and security features. In the future, particularly sustainable technology fields will be added around battery components, fuel cell elements, filtration layers, and even function-integrated material solutions, e.g., EMI shielding function.

Fraunhofer IGCV wetlaid nonwovens line is specifically designed as a pilot line. In principle, very different fiber materials such as natural, regenerated, and synthetic fibers can be processed, mainly recycled and technical fibers. The system offers the highest possible flexibility regarding material variants and process parameters. In addition, sufficiently high productivity is ensured to allow subsequent scaled processing trials (e.g., demonstrator production).

The main operating range of the wetlaid line relates to the following parameters:

  • Processing speed: up to 30 m/min
  • Role width: 610 mm
  • Grammage: approx. 20–300 gsm
  • Overall machinery is ≥ IP65 standard for processing, e.g., conductive fiber materials
  • Machine design based on an angled wire configuration with high dewatering capacity, e.g., for processing highly diluted fiber suspensions or for material variants with high water retention capacity.
  • Machine modular system design with maximum flexibility for a quick change of material variants or a quick change of process parameters. The setup allows short-term hardware adaptations as well as project-specific modifications.

Research focus: carbon recycling at the end of the life cycle
The research focus of Fraunhofer IGCV is primarily in the field of technical staple fibers. The processing of recycled carbon fibers is a particular focus. Current research topics in this context include, for example, the research, optimization, and further development of binder systems, different fiber lengths and fiber length distributions, nonwoven homogeneity, and fiber orientation. In addition, the focus is on the integration of digital as well as AI-supported methods within the framework of online process monitoring. Further research topics, such as the production of gas diffusion layers for fuel cell components, the further development of battery elements, and filtration applications, are currently being developed.

Source:

Fraunhofer Institute for Casting, Composite and Processing Technology IGCV

Graphik: Pixabay
11.01.2022

FIMATEC innovation network enters second funding phase

The network for the development of fiber materials technology for healthcare and sports will receive funding from the Central Innovation Programme for SMEs (ZIM) for another two years.

The Federal Ministry for Economic Affairs and Climate Action (BMWi) approved a corresponding application in December 2021. This will continue to provide funding for the development of innovative functional fibers, smart textiles and application-optimized fiber composite materials until June 2023 and strengthen the technological competitiveness and innovative strength of small and medium-sized enterprises (SMEs).

The network for the development of fiber materials technology for healthcare and sports will receive funding from the Central Innovation Programme for SMEs (ZIM) for another two years.

The Federal Ministry for Economic Affairs and Climate Action (BMWi) approved a corresponding application in December 2021. This will continue to provide funding for the development of innovative functional fibers, smart textiles and application-optimized fiber composite materials until June 2023 and strengthen the technological competitiveness and innovative strength of small and medium-sized enterprises (SMEs).

For this purpose, the FIMATEC innovation network combines competences from different engineering and scientific disciplines with small and medium-sized manufacturers and service providers from the target sectors in medicine and sports (e.g. orthopaedics, prosthetics, surgery, smart textiles) as well as players from the textile and plastics industry.      

This interdisciplinary combination of industrial partners and application-oriented research institutions increases competitiveness and enables the players to realise their technical research and development projects quickly and in a targeted manner. The focus for the joint R&D projects of the companies and research institutions is on the development of innovative materials and efficient manufacturing technologies. 
          
Fiber-based materials have become indispensable in many applications in medicine and sports. As a pure fiber, processed into a textile or as a fiber composite plastic, they offer an almost unlimited variety for adjusting property and functional profiles. At the same time, the demands on the range of functions, performance and cost-effectiveness are constantly increasing, so that there is great potential for innovation. Developments are driven on the one hand by new materials and manufacturing processes, and on the other by innovative applications. Products with new and superior functions create a technological advantage over international competitors and enable higher sales revenues. In addition, efficient processes, application-optimized materials or even the integration of functions into the basic structure of textile materials lead to lower production costs and improved marketing opportunities in the future.
For developments in this context, the partners have joined forces in the FIMATEC innovation network, thus combining their expertise. Within the network, innovative materials and processes are being developed jointly in the following areas and tested in future-oriented products and services:

  • Functional fibers
    Innovative fiber materials with integrated functionalities
  • Preforming
    Highly load path optimized fiber orientations for complex fiber composite components.    
  • Smart Textiles
    Textile-based sensors and actuators
  • Hybrid material and manufacturing technologies
    Application-optimized components through cross-technology solution approaches.    
  • Fiber composites  
    Intelligent matrix systems and function-optimized fiber materials.    
  • Fiber-reinforced 3D printing  
    High-quality additive manufacturing processes for the efficient production of individualized products.

 
17 network partners are researching fiber-based materials for medical and sports technologyCurrently, ten companies and seven research institutions are involved in FIMATEC. Interested companies and research institutions as well as potential users can continue to participate in the cooperation network or R&D projects. In the course of membership, the partners are actively supported in identifying and initiating innovation projects as well as securing financing through funding acquisition. One application for ZIM project funding has already been approved by FIMATEC in its first year.

The aim of the already approved project "CFKadapt" is to develop a thermoformable fiber-plastic composite material for optimally adaptable orthopedic aids such as prostheses and orthoses. In the "Modul3Rad" project, which is currently being worked out in detail, the project partners intend to develop a modular lightweight frame system for the construction of user-friendly therapy tricycles, suitable for everyday use by severely and very severely disabled children. Three further collaborative projects are already in the planning stage.

The technology and knowledge transfer enables in particular small and medium-sized enterprises (SMEs) to access cutting-edge technological research, especially these are often denied access to innovations due to the lack of their own research departments. The IWS GmbH has taken over the network management for FIMATEC and supports the partners from the first idea to the search for suitable project partners and the preparation and coordination of funding applications. The aim is to obtain funding from the Central Innovation Programme for SMEs (ZIM), which offers companies funding opportunities for a wide range of technical innovation projects in cooperation with research institutions.

FIMATEC-netzwork partners
all ahead composites GmbH | Veitshöchheim | www.bike-ahead-composites.de
Altropol Kunststoff GmbH | Stockelsdorf | www.altropol.de
Diondo GmbH | Hattingen | www.diondo.com
Mailinger innovative fiber solutions GmbH | Sontra | www.mailinger.de
Sanitätshaus Manfred Klein GmbH & Co. KG | Stade | www.klein-sanitaetshaus.de
STREHL GmbH & Co KG | Bremervörde | www.rehastrehl.de
WESOM Textil GmbH | Olbersdorf | www.wesom-textil.de
Faserinstitut Bremen e.V. (FIBRE) | www.faserinstitut.de
E.F.M. GmbH | Olbersdorf | www.efm-gmbh.de
REHA-OT Lüneburg Melchior und Fittkau GmbH | Olbersdorf | www.rehaot.de
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM | Bremen | www.ifam.fraunhofer.de
Leibniz-Institut für Polymerforschung Dresden e.V. (IPF) | www.ipfdd.de
Institut für Polymertechnologien Wismar e.V. (IPT) | www.ipt-wismar.de
Institut für Verbundwerkstoffe GmbH | Kaiserslautern | www.ivw.uni-kl.de

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IT solutions for stable supply chains © pixabay
30.11.2021

IT solutions for stable supply chains

Global supply chains comprise complex networks, making them particularly vulnerable. The UK is a prime example of this, where logistics problems are currently resulting in empty supermarket shelves and closed gas stations. Fraunhofer experts provide IT solutions that counteract supply bottlenecks in international goods traffic and maintain robust supply chains.

Earthquakes in South America, floods in Germany or political unrest in Asia: all compromise supply chains. A research team at the Fraunhofer Institute for Industrial Mathematics ITWM is developing mathematical methods that can be used to calculate how to minimize risks to supply chains. “Mathematically speaking,” explains Dr. Heiner Ackermann, Deputy Head of Optimization – Operations Research, “these disruptive events create a multidimensional decision problem.”    

Global supply chains comprise complex networks, making them particularly vulnerable. The UK is a prime example of this, where logistics problems are currently resulting in empty supermarket shelves and closed gas stations. Fraunhofer experts provide IT solutions that counteract supply bottlenecks in international goods traffic and maintain robust supply chains.

Earthquakes in South America, floods in Germany or political unrest in Asia: all compromise supply chains. A research team at the Fraunhofer Institute for Industrial Mathematics ITWM is developing mathematical methods that can be used to calculate how to minimize risks to supply chains. “Mathematically speaking,” explains Dr. Heiner Ackermann, Deputy Head of Optimization – Operations Research, “these disruptive events create a multidimensional decision problem.”    

Cushioning risks without additional costs
Ackermann’s team of experts analyze the properties of supply chains using mathematical models. The failure scenarios simulated on the basis of these calculations show at which points there is a greater need for action. In the second step, the researchers focus on holistic optimization – for a more robust supply chain that can cushion risks without incurring major costs. The experts package all variables into a multicriteria optimization problem. In this way, they determine the best possible solution for the triad of resilience, cost and risk. Algorithms calculate the optimum balance and with it various options for raw materials, suppliers and warehousing. Even the use of alternative materials is considered. The top priority: as few assumptions as possible. “Our work has set the ball rolling – companies that previously relied on Excel spreadsheets and their gut feeling are now engaging in very fruitful discussions,” explains Ackermann, adding: “Whether you are dealing with supply chains or supply networks, mathematics is a universal and very effective tool.”

Early detection of potential supply shortages
The Fraunhofer Institute for Material Flow and Logistics IML also offers highly effective support for testing and optimizing supply chains with its Order-To-Delivery-NETwork (OTD-NET) simulator. Thanks to this tool, planning and material flow processes from order to delivery can be continuously assessed. “OTD-NET maps even highly complex supply chains in full and at all levels, including the planning and information flow processes. Using various parameters, it is possible to accurately model cooperation between supply chain partners on the computer,” specifies Marco Motta, Head of Supply Chain Engineering at Fraunhofer IML.
 
Combining digital twins of supply chains with simulations
The tool set examines networks particularly with regard to customer promises in terms of delivery reliability and quality, etc., costs, environmental considerations and, in the analysis of alternative scenarios, resilience. “In the simulation, I can easily play around with demand peaks, a slump in the respective market or scenarios in which production is disrupted,” explains the Fraunhofer IML expert. In this way, forecasts can be made about how a supply chain will react in a state of emergency. Logistics assistance systems that combine a digital twin of the supply chain with simulations show dispatchers which cargo ships have loaded which parts, where these are located and when the consignment will be available at the required location. Supply for the next 20–30 weeks can thus be depicted for global networks, enabling potential bottlenecks to be detected early on. Tracking is also a distinguishing feature of the solution for demand and capacity management. Not only is the number of parts affected displayed but planners can also directly see the impact of this on the whole of production.
 
Most recently, both the automotive and medical sectors have suffered from supply bottlenecks. Saskia Sardesai, Senior Scientist at Fraunhofer IML, is leading different research projects in which OTD-NET is being used to increase resilience in value creation networks for medical supplies. “Especially smaller and medium-sized companies were addressing this problem using existing spreadsheet analysis tools. However, this approach does not identify dynamics.” This is where OTD-NET comes into play: The simulation dynamically shows over a long period whether all parts will be at the right location at the right time. “If all parts are available except for those from my transatlantic supplier and there is no alternative supplier in Europe, I will quickly have a break in my chain lasting over a month,” outlines the specialist.

Increasing the European manufacturing sector’s resilience to future pandemics In the European research project “CO-VERSATILE”, overseen by Sardesai, participants are doing everything in their power to increase the European manufacturing sector’s resilience to future pandemics. The supply chain should be able to react quickly and effectively to a sudden spike in demand for strategic medical supplies. To that end, experts at Fraunhofer IML have developed a simulation model that takes into account future peaks and fluctuations in demand as well as supplier risks. Companies are immediately given an overview of which effects they will have to face. “We have created very simple models to facilitate rapid feedback and implementation for a variety of companies,” explains the project manager. Particular attention was paid to capacities, lead times, transportation frequency and possible supply restrictions. Users can see how individual factors interplay – an invaluable advantage compared to the long-standing Excel solution.