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DITF: 3D Printing Setting for Lignin-Coated Protective Gloves (c) DITF
06.09.2024

DITF: 3D Printing Setting for Lignin-Coated Protective Gloves

Protective gloves, such as those used for work, sport or household gardening, retrieve their protective function from a special coating. This coating provides abrasion resistance, makes the material waterproof and resistant to chemicals or oil, and even protects against cuts and punctures. Until now, coatings made of oil-based polymers, nitrile rubber or latex have been the main materials used. Scientists at the German Institutes of Textile and Fiber Research Denkendorf (DITF) have succeeded in developing a robust yet flexible glove coating using environmentally friendly lignin in a 3D printing process.

Coatings that are subject to mechanical stress always suffer from a certain degree of abrasion that is dispersed in the surrounding area. This is also the case with coated protective gloves. In order to avoid long-term pollution of the environment, materials should be used whose abrasion particles are biodegradable. The aim of the research project was to improve conventional protective equipment and integrate more sustainable materials.

Protective gloves, such as those used for work, sport or household gardening, retrieve their protective function from a special coating. This coating provides abrasion resistance, makes the material waterproof and resistant to chemicals or oil, and even protects against cuts and punctures. Until now, coatings made of oil-based polymers, nitrile rubber or latex have been the main materials used. Scientists at the German Institutes of Textile and Fiber Research Denkendorf (DITF) have succeeded in developing a robust yet flexible glove coating using environmentally friendly lignin in a 3D printing process.

Coatings that are subject to mechanical stress always suffer from a certain degree of abrasion that is dispersed in the surrounding area. This is also the case with coated protective gloves. In order to avoid long-term pollution of the environment, materials should be used whose abrasion particles are biodegradable. The aim of the research project was to improve conventional protective equipment and integrate more sustainable materials.

The biopolymer lignin is a natural component of plant cells that is produced in large quantities as a by-product of paper manufacturing. Due to its properties, it represents an environmentally friendly alternative to oil-based coating polymers.

The scientists developed biopolymer compounds containing lignin, which were used to produce thermoplastic materials that can be processed using 3D printing.

Lignin has few polar groups, which makes lignins hydrophobic and therefore insoluble in water. For this reason, they biodegrade slowly. This makes them particularly suitable for durable coating materials.

Despite this durability, lignin particles that are released into the environment through abrasion biodegrade faster than the abrasion of conventional coatings. This is due to the much higher surface/volume ratio.

The use of 3D printing makes it possible to produce the coating precisely and efficiently. The 3D printing process also makes it possible to adapt the glove to the individual needs of the wearer. This increases wearer comfort and promotes freedom of movement.

The research project shows that the use of lignin not only offers ecological benefits, but that protective gloves coated with it are also particularly durable and resistant. They meet safety standards and at the same time contribute to sustainability in the world of work.

Source:

Deutsche Institute für Textil- und Faserforschung (DITF)

The partners at the BioFibreLoop kick-off event. Photo: DITF
The partners at the BioFibreLoop kick-off event.
01.07.2024

BioFibreLoop has been started

The German Institutes of Textile and Fiber Research Denkendorf (DITF) are coordinating the research project, which is funded as part of the European Union's Horizon Europe research and innovation program. The aim of BioFibreLoop is to develop recyclable outdoor and work clothing made from renewable bio-based materials. The kick-off event took place in Denkendorf on June 26 and 27, 2024.

The textile industry is facing two challenges: on the one hand, production must become more sustainable and environmentally friendly and, on the other, consumers are expecting more and more smart functions from clothing.

In addition, the production of functional textiles often involves the use of chemicals that are harmful to the environment and health and make subsequent recycling more difficult.

Intelligent innovations must therefore ensure that harmful chemicals are replaced, water is saved and more durable, recyclable bio-based materials are used, thereby reducing the usually considerable carbon footprint of textile products. Digitalized processes are intended to ensure greater efficiency and a closed cycle.

The German Institutes of Textile and Fiber Research Denkendorf (DITF) are coordinating the research project, which is funded as part of the European Union's Horizon Europe research and innovation program. The aim of BioFibreLoop is to develop recyclable outdoor and work clothing made from renewable bio-based materials. The kick-off event took place in Denkendorf on June 26 and 27, 2024.

The textile industry is facing two challenges: on the one hand, production must become more sustainable and environmentally friendly and, on the other, consumers are expecting more and more smart functions from clothing.

In addition, the production of functional textiles often involves the use of chemicals that are harmful to the environment and health and make subsequent recycling more difficult.

Intelligent innovations must therefore ensure that harmful chemicals are replaced, water is saved and more durable, recyclable bio-based materials are used, thereby reducing the usually considerable carbon footprint of textile products. Digitalized processes are intended to ensure greater efficiency and a closed cycle.

For example, the BioFibreLoop project uses laser technology to imitate natural structures in order to produce garments with water and oil-repellent, self-cleaning and antibacterial properties. At the end result of the research work will be affordable, resource and environmentally friendly, yet high-performance and durable fibers and textiles made from renewable sources such as lignin, cellulose and polylactic acid will be available. All processes are aimed at a circular economy with comprehensive recycling and virtually waste-free functionalization based on nature's example. In this way, greenhouse gas emissions could be reduced by 20 percent by 2035.

The technology for the functionalization and recycling of bio-based materials is being developed in three industrial demonstration projects in Austria, the Czech Republic and Germany. At the end of the project, a patented circular, sustainable and reliable process for the production of recyclable functional textiles will be established.

The BioFibreLoop project has a duration of 42 months and a total budget of almost 7 million euros, with 1.5 million going to the coordinator DITF.

The consortium consists of 13 partners from nine countries who contribute expertise and resources from science and industry:

  • German Institutes of Textile and Fiber Research Denkendorf (DITF), Coordinator, Germany
  • Next Technology Tecnotessile Società nazionale di ricerca R. L., Italy
  • Centre Technologique ALPhANOV, France
  • G. Knopf’s Sohn GmbH & Co. KG, Germany
  • FreyZein Urban Outdoor GmbH, Austria
  • BEES - BE Engineers for Society, Italy
  • BAT Graphics Vernitech, France
  • Interuniversitair Micro-Electronica Centrum, Belgium
  • Idener Research & Development Agrupacion de Interes Economico, Spain
  • Teknologian tutkimuskeskus VTT Oy, Finland
  • Det Nationale Forskningscenter for Arbejdsmiljø, Denmark
  • Steinbeis Innovation gGmbH, Germany
  • NIL Textile SRO, Czech Republic
Source:

Deutsche Institute für Textil- und Faserforschung

3D spacer fabric Photo: ARIS/DITF
3D spacer fabric
07.05.2024

Graywater treatment with 3D textiles

The demand for water in Germany is increasing and used water is not being utilized sufficiently. Graywater in particular, i.e. wastewater from showers, bathtubs and washbasins, offers great potential for further use. It can be brought to service water quality on site and reused for flushing toilets or watering gardens, for example. Thanks to flexible 3D textiles, it can even be used in almost any building to save space.

Around 50 to 80 percent of all domestic wastewater is graywater. Until now, large containers and tanks have been needed to reprocess it and return it to the cycle, taking up a lot of space in the building. The German Institutes of Textile and Fiber Research Denkendorf (DITF) and their project partner ARIS have developed a biological, textile-based system.

The demand for water in Germany is increasing and used water is not being utilized sufficiently. Graywater in particular, i.e. wastewater from showers, bathtubs and washbasins, offers great potential for further use. It can be brought to service water quality on site and reused for flushing toilets or watering gardens, for example. Thanks to flexible 3D textiles, it can even be used in almost any building to save space.

Around 50 to 80 percent of all domestic wastewater is graywater. Until now, large containers and tanks have been needed to reprocess it and return it to the cycle, taking up a lot of space in the building. The German Institutes of Textile and Fiber Research Denkendorf (DITF) and their project partner ARIS have developed a biological, textile-based system.

It is based on a 3D spacer fabric made of highly durable polypropylene. Its advantage is that it can be installed flat and is therefore extremely space-saving. Thanks to its special system geometry, it can be installed in places that would otherwise remain unused - for example in a new building under the floor of an underground garage, on a flat roof or in the garden. It can be modularly adapted to the water requirements and structural conditions in the respective buildings. "Even vertical solutions on facades are conceivable," explains DITF scientist Jamal Sarsour. This means that the graywater treatment system could be used in densely built-up cities in particular.

The system developed by the project partners requires little maintenance and is therefore particularly cost-effective. Compared to previous solutions, it is characterized by a long lifespan. It therefore contributes to sustainable water use and makes a valuable contribution to the circular economy.

ARIS plans to launch the new textile-based graywater treatment system on the market in 2024.

The project will be presented on June 13, 2024 at the SME Innovation Day of the Federal Ministry for Economic Affairs and Climate Protection in Berlin.

The research project with the number 16KN080829 of AiF Projekt GmbH, Berlin, was funded by the Federal Ministry of Economics and Climate Protection as part of the Central Innovation Program for SMEs (ZIM) on the basis of a resolution of the German Bundestag.

Source:

Deutsche Institute für Textil- und Faserforschung Denkendorf (DITF)

Professor Dr.-Ing. Markus Milwich Photo: DITF
Professor Dr.-Ing. Markus Milwich.
19.03.2024

Markus Milwich represents "Lightweight Design Agency for Baden-Württemberg"

Lightweight design is a key enabler for addressing the energy transition and sustainable economy. Following the liquidation of the state agency Leichtbau BW GmbH, a consortium consisting of the Allianz Faserbasierter Werkstoffe Baden-Württtemberg (AFBW), the Leichtbauzentrum Baden-Württemberg (LBZ e.V. -BW) and Composites United Baden-Württemberg (CU BW) now represents the interests of the lightweight construction community in the State.

The Lightweight Design Agency for Baden-Württemberg is set up for this purpose on behalf of and with the support of the State. The Lightweight Construction Alliance BW is the central point of contact for all players in the field of lightweight construction in the State and acts in their interests at national and international level. Professor Markus Milwich from the German Institutes of Textile and Fiber Research Denkendorf (DITF) represents the agency.

Lightweight design is a key enabler for addressing the energy transition and sustainable economy. Following the liquidation of the state agency Leichtbau BW GmbH, a consortium consisting of the Allianz Faserbasierter Werkstoffe Baden-Württtemberg (AFBW), the Leichtbauzentrum Baden-Württemberg (LBZ e.V. -BW) and Composites United Baden-Württemberg (CU BW) now represents the interests of the lightweight construction community in the State.

The Lightweight Design Agency for Baden-Württemberg is set up for this purpose on behalf of and with the support of the State. The Lightweight Construction Alliance BW is the central point of contact for all players in the field of lightweight construction in the State and acts in their interests at national and international level. Professor Markus Milwich from the German Institutes of Textile and Fiber Research Denkendorf (DITF) represents the agency.

The use of lightweight materials in combination with new production technologies will significantly reduce energy consumption in transportation, the manufacturing industry and the construction sector. Resources can be saved through the use of new materials. As a cross-functional technology, lightweight construction covers entire value chain from production and use to recycling and reuse.

The aim of the state government is to establish Baden-Württemberg as a leading provider of innovative lightweight construction technologies in order to strengthen the local economy and secure high-quality jobs.

Among others, the "Lightweight Construction Alliance Baden-Württemberg" will continue the nationally renowned "Lightweight Construction Day", which acts as an important source of inspiration for a wide range of lightweight construction topics among business and scientific community.

Professor Milwich, an expert with many years of experience and an excellent network beyond the State's borders, has been recruited for this task. In his role, Milwich also represents the state of Baden-Württemberg on the Strategy Advisory Board of the Lightweight Construction Initiative of the Federal Ministry for Economic Affairs and Climate Action, which supports the cross functional-technology and efficient transfer of knowledge between the various nationwide players in lightweight construction and serves as a central point of contact for entrepreneurs nationwide for all relevant questions.

From 2005 to 2020, Professor Milwich headed the Composite Technology research at the DITF, which was integrated into the Competence Center Polymers and Fiber Composites in 2020. He is also an honorary professor at Reutlingen University, where he teaches hybrid materials and composites. "Lightweight design is an essential aspect for sustainability, environmental and resource conservation. I always showcase this in research and teaching and now also as a representative of the lightweight construction community in Baden-Württemberg," emphasizes Professor Milwich.

Source:

Deutsche Institute für Textil- und Faserforschung

Thomas Stegmaier appointed Sustainability Officer Photo: DITF
Dr.-Ing. habil. Thomas Stegmaier
11.03.2024

DITF: Thomas Stegmaier appointed Sustainability Officer

The EU directive on the further development of sustainability reporting (CSRD) poses major challenges for companies and the public sector. Until now, the regulations have only applied to large capital market-oriented companies. However, far-reaching changes to sustainability reporting are expected when the CSRD is transposed into national law in 2024. The German Institutes of Textile and Fiber Research (DITF) are facing up to this challenge of external reporting and at the same time the responsibility for sustainable and resource-conserving science. The Textile Research Center has therefore set up a specialist department reporting to the Executive Board.

The DITF are reaffirming their commitment to sustainability with the appointment of the previous Head of the Competence Center Textile Chemistry, Environment & Energy, Dr.-Ing. habil. Thomas Stegmaier, as Chief Sustainability Officer (CSO). In addition to this new role, Stegmaier will continue to provide his expertise to the Competence Center Textile Chemistry, Environment & Energy as Deputy Head.

The EU directive on the further development of sustainability reporting (CSRD) poses major challenges for companies and the public sector. Until now, the regulations have only applied to large capital market-oriented companies. However, far-reaching changes to sustainability reporting are expected when the CSRD is transposed into national law in 2024. The German Institutes of Textile and Fiber Research (DITF) are facing up to this challenge of external reporting and at the same time the responsibility for sustainable and resource-conserving science. The Textile Research Center has therefore set up a specialist department reporting to the Executive Board.

The DITF are reaffirming their commitment to sustainability with the appointment of the previous Head of the Competence Center Textile Chemistry, Environment & Energy, Dr.-Ing. habil. Thomas Stegmaier, as Chief Sustainability Officer (CSO). In addition to this new role, Stegmaier will continue to provide his expertise to the Competence Center Textile Chemistry, Environment & Energy as Deputy Head.

The task of the Chief Sustainability Officer is to develop solutions to reduce the DITF's energy and resource consumption, promote renewable energies and implement efficient energy use. The management team, the operational organizational units and all employees are involved in the process.

The CSO also acts as a driving force for both the Executive Board and the research departments to promote sustainability issues.

DITF: Modernized spinning plant for sustainable and functional fibres Photo: DITF
Bi-component BCF spinning plant from Oerlikon Neumag
06.03.2024

DITF: Modernized spinning plant for sustainable and functional fibres

The German Institutes of Textile and Fiber Research Denkendorf (DITF) have modernized and expanded their melt spinning pilot plant with support from the State of Baden-Württemberg. The new facility enables research into new spinning processes, fiber functionalization and sustainable fibers made from biodegradable and bio-based polymers.

In the field of melt spinning, the DITF are working on several pioneering research areas, for example the development of various fibers for medical implants or fibers made from polylactide, a sustainable bio-based polyester. Other focal points include the development of flame-retardant polyamides and their processing into fibers for carpet and automotive applications as well as the development of carbon fibers from melt-spun precursors. The development of a bio-based alternative to petroleum-based polyethylene terephthalate (PET) fibers into polyethylene furanoate (PEF) fibers is also new. Bicomponent spinning technology, in which the fibers can be produced from two different components, plays a particularly important role, too.

The German Institutes of Textile and Fiber Research Denkendorf (DITF) have modernized and expanded their melt spinning pilot plant with support from the State of Baden-Württemberg. The new facility enables research into new spinning processes, fiber functionalization and sustainable fibers made from biodegradable and bio-based polymers.

In the field of melt spinning, the DITF are working on several pioneering research areas, for example the development of various fibers for medical implants or fibers made from polylactide, a sustainable bio-based polyester. Other focal points include the development of flame-retardant polyamides and their processing into fibers for carpet and automotive applications as well as the development of carbon fibers from melt-spun precursors. The development of a bio-based alternative to petroleum-based polyethylene terephthalate (PET) fibers into polyethylene furanoate (PEF) fibers is also new. Bicomponent spinning technology, in which the fibers can be produced from two different components, plays a particularly important role, too.

Since polyamide (PA) and many other polymers were developed more than 85 years ago, various melt-spun fibers have revolutionized the textile world. In the field of technical textiles, they can have on a variety of functions: depending on their exact composition, they can for example be electrically conductive or luminescent. They can also show antimicrobial properties and be flame-retardant. They are suitable for lightweight construction, for medical applications or for insulating buildings.

In order to protect the environment and resources, the use of bio-based fibers will be increased in the future with a special focus on easy-to-recycle fibers. To this end, the DITF are conducting research into sustainable polyamides, polyesters and polyolefins as well as many other polymers. Many 'classic', that is, petroleum-based polymers cannot or only insufficiently be broken down into their components or recycled directly after use. An important goal of new research work is therefore to further establish systematic recycling methods to produce fibers of the highest possible quality.

For these forward-looking tasks, a bicomponent spinning plant from Oerlikon Neumag was set up and commissioned on an industrial scale at the DITF in January. The BCF process (bulk continuous filaments) allows special bundling, bulking and processing of the (multifilament) fibers. This process enables the large-scale synthesis of carpet yarns as well as staple fiber production, a unique feature in a public research institute. The system is supplemented by a so-called spinline rheometer. This allows a range of measurement-specific chemical and physical data to be recorded online and inline, which will contribute to a better understanding of fiber formation. In addition, a new compounder will be used for the development of functionalized polymers and for the energy-saving thermomechanical recycling of textile waste.

DITF: Biopolymers from bacteria protect technical textiles Photo: DITF
Charging a doctor blade with molten PHA using a hot-melt gun
23.02.2024

DITF: Biopolymers from bacteria protect technical textiles

Textiles for technical applications often derive their special function via the application of coatings. This way, textiles become, for example wind and water proof or more resistant to abrasion. Usually, petroleum-based substances such as polyacrylates or polyurethanes are used. However, these consume exhaustible resources and the materials can end up in the environment if handled improperly. Therefore, the German Institutes of Textile and Fiber Research Denkendorf (DITF) are researching materials from renewable sources that are recyclable and do not pollute the environment after use. Polymers that can be produced from bacteria are here of particular interest.

Textiles for technical applications often derive their special function via the application of coatings. This way, textiles become, for example wind and water proof or more resistant to abrasion. Usually, petroleum-based substances such as polyacrylates or polyurethanes are used. However, these consume exhaustible resources and the materials can end up in the environment if handled improperly. Therefore, the German Institutes of Textile and Fiber Research Denkendorf (DITF) are researching materials from renewable sources that are recyclable and do not pollute the environment after use. Polymers that can be produced from bacteria are here of particular interest.

These biopolymers have the advantage that they can be produced in anything from small laboratory reactors to large production plants. The most promising biopolymers include polysaccharides, polyamides from amino acids and polyesters such as polylactic acid or polyhydroxyalkanoates (PHAs), all of which are derived from renewable raw materials. PHAs is an umbrella term for a group of biotechnologically produced polyesters. The main difference between these polyesters is the number of carbon atoms in the repeat unit. To date, they have mainly been investigated for medical applications. As PHAs products are increasingly available on the market, coatings made from PHAs may also be increasingly used in technical applications in the future.

The bacteria from which the PHAs are obtained grow with the help of carbohydrates, fats and an increased CO2 concentration and light with suitable wavelength.

The properties of PHA can be adapted by varying the structure of the repeat unit. This makes polyhydroxyalkanoates a particularly interesting class of compounds for technical textile coatings, which has hardly been investigated to date. Due to their water-repellent properties, which stem from their molecular structure, and their stable structure, polyhydroxyalkanoates have great potential for the production of water-repellent, mechanically resilient textiles, such as those in demand in the automotive sector and for outdoor clothing.

The DITF have already carried out successful research work in this area. Coatings on cotton yarns and fabrics made of cotton, polyamide and polyester showed smooth and quite good adhesion. The PHA types for the coating were both procured on the open market and produced by the research partner Fraunhofer IGB. It was shown that the molten polymer can be applied to cotton yarns by extrusion through a coating nozzle. The molten polymer was successfully coated onto fabric using a doctor blade. The length of the molecular side chain of the PHA plays an important role in the properties of the coated textile. Although PHAs with medium-length side chains are better suited to achieving low stiffness and a good textile handle, their wash resistance is low. PHAs with short side chains are suitable for achieving high wash and abrasion resistance, but the textile handle is somewhat stiffer.

The team is currently investigating how the properties of PHAs can be changed in order to achieve the desired resistance and textile properties in equal measure. There are also plans to formulate aqueous formulations for yarn and textile finishing. This will allow much thinner coatings to be applied to textiles than is possible with molten PHAs.

Other DITF research teams are investigating whether PHAs are also suitable for the production of fibers and nonwovens.

Source:

Deutsche Institute für Textil- und Faserforschung (DITF)

DITF: Modular cutting tool recognized with JEC Composites Innovation Award Photo: Leitz
Hermann Finckh (DITF) and Andreas Kisselbach (Leitz GmbH & Co. KG)
16.02.2024

DITF: Modular cutting tool recognized with JEC Composites Innovation Award

Hermann Finckh received the JEC Composites Innovation Award in the category Equipment Machinery & Heavy Industries for the innovation MAXIMUM WEIGHT REDUCTION OF COMPOSITE TOOLS. The research team from the German Institutes of Textile and Fiber Research Denkendorf (DITF) developed a new modular cutting tool for woodworking machines, which was produced and successfully tested by the industrial partner Leitz GmbH & Co. KG.

The extremely lightweight planing tool was made from carbon fiber-reinforced plastics (CFRPs) instead of aluminum using a completely new modular construction principle. As a result, it weighs 50 percent less than conventional tools. It enables significantly higher working speed, which enables a one-and-a-half-fold increase in productivity. The development of the extreme-lightweight principle was performed by numerical simulation and every solution was virtually tested in advance. A patent application has been filed for the concept.

Hermann Finckh received the JEC Composites Innovation Award in the category Equipment Machinery & Heavy Industries for the innovation MAXIMUM WEIGHT REDUCTION OF COMPOSITE TOOLS. The research team from the German Institutes of Textile and Fiber Research Denkendorf (DITF) developed a new modular cutting tool for woodworking machines, which was produced and successfully tested by the industrial partner Leitz GmbH & Co. KG.

The extremely lightweight planing tool was made from carbon fiber-reinforced plastics (CFRPs) instead of aluminum using a completely new modular construction principle. As a result, it weighs 50 percent less than conventional tools. It enables significantly higher working speed, which enables a one-and-a-half-fold increase in productivity. The development of the extreme-lightweight principle was performed by numerical simulation and every solution was virtually tested in advance. A patent application has been filed for the concept.

DITF: Recyclable event and trade fair furniture made of paper (c) DITF
Structurally wound paper yarn element with green sensor yarn.
26.01.2024

DITF: Recyclable event and trade fair furniture made of paper

A lot of waste is generated in the trade fair and event industry. It makes sense to have furniture that can quickly be dismantled and stored to save space - or simply disposed of and recycled. Paper is the ideal raw material here: locally available and renewable. It also has an established recycling process. The German Institutes of Textile and Fiber Research (DITF) and their project partners have jointly developed a recycling-friendly modular system for trade fair furniture. The "PapierEvents" project was funded by the German Federal Environmental Foundation (DBU).

Once the paper has been brought into yarn form, it can be processed into a wide variety of basic elements using the structure winding process, creating a completely new design language.

A lot of waste is generated in the trade fair and event industry. It makes sense to have furniture that can quickly be dismantled and stored to save space - or simply disposed of and recycled. Paper is the ideal raw material here: locally available and renewable. It also has an established recycling process. The German Institutes of Textile and Fiber Research (DITF) and their project partners have jointly developed a recycling-friendly modular system for trade fair furniture. The "PapierEvents" project was funded by the German Federal Environmental Foundation (DBU).

Once the paper has been brought into yarn form, it can be processed into a wide variety of basic elements using the structure winding process, creating a completely new design language.

The unusual look is created in the structure winding process. In this technology developed at the DITF, the yarn is deposited precisely on a rotating mandrel. This enables high process speeds and a high degree of automation. After the winding process, the individual yarns are fixed, creating a self-supporting component. A starch-based adhesive, which is also made from renewable and degradable raw materials, was used in the project for the fixation.

The recyclability of all the basic elements developed in the project was investigated and confirmed. For this purpose the research colleagues at the project partner from the Department of Paper Production and Mechanical Process Engineering at TU Darmstadt (PMV) used the CEPI method, a new standard test procedure from the Confederation of European Paper Industries.

Sensor and lighting functions were also implemented in a recycling-friendly manner. The paper sensor yarns are integrated into the components and detect contact.

Also, a modular system for trade fair and event furniture was developed. The furniture is lightweight and modular. For example, the total weight of the counter shown is well under ten kilograms and individual parts can easily be shipped in standard packages. All parts can be used several times, making them suitable for campaigns lasting several weeks.

A counter, a customer stopper in DIN A1 format and a pyramid-shaped stand were used as demonstrators. The research work of the DITF (textile technology) and PMV (paper processing) was supplemented by other partners: GarnTec GmbH developed the paper yarns used, the industrial designers from quintessence design provided important suggestions for the visual and functional design of the elements and connectors and the event agency Rödig GmbH evaluated the ideas and concepts in terms of usability in practical use.

Source:

Deutsche Institute für Textil- und Faserforschung (DITF)

DITF: Pleated textile tube for ventilation of surgical fields Photo: Wandres GmbH micro-cleaning
06.11.2023

DITF: Pleated textile tube for ventilation of surgical fields

The German Institutes of Textile and Fiber Research Denkendorf (DITF) will be exhibiting at the MEDICA medical technology trade fair in Düsseldorf from November 13 to 16, 2023. At the joint stand of Baden-Württemberg International, a new development will be shown, that can reduce infections during operations.

These nosocomial infections occur when surgical wounds are contaminated by microbes. They can lead to serious complications. The task of the contract development was to create a porous ring tube that reduces the risk of contamination during operations. Germ-free air is introduced into the operating field via the so-called airflow ring, thereby shielding pathogenic germs.

The tube is knitted from polyester and folded. This pleating ensures that the circular shape remains stable, but the tube is still flexible. The outside of the tube is coated so that the air is directed into the inner area of the airflow ring. The ring is attached to the skin with a biocompatible adhesive so that it fits tightly on curved areas of the body such as the face or around joints. The position of the ring can be easily changed.

The German Institutes of Textile and Fiber Research Denkendorf (DITF) will be exhibiting at the MEDICA medical technology trade fair in Düsseldorf from November 13 to 16, 2023. At the joint stand of Baden-Württemberg International, a new development will be shown, that can reduce infections during operations.

These nosocomial infections occur when surgical wounds are contaminated by microbes. They can lead to serious complications. The task of the contract development was to create a porous ring tube that reduces the risk of contamination during operations. Germ-free air is introduced into the operating field via the so-called airflow ring, thereby shielding pathogenic germs.

The tube is knitted from polyester and folded. This pleating ensures that the circular shape remains stable, but the tube is still flexible. The outside of the tube is coated so that the air is directed into the inner area of the airflow ring. The ring is attached to the skin with a biocompatible adhesive so that it fits tightly on curved areas of the body such as the face or around joints. The position of the ring can be easily changed.

The functionality of the airflow ring was successfully demonstrated in tests with nebulized colony-forming bacteria.

The tests showed that the ring also withstands significantly worse conditions than in an operating theater, e.g. in doctors' surgeries and in situations with lower hygiene standards.

DITF: Lignin coating for Geotextiles Photo: DITF
Coating process of a cellulose-based nonwoven with the lignin compound using thermoplastic processing methods on a continuous coating line.
27.10.2023

DITF: Lignin coating for Geotextiles

Textiles are a given in civil engineering: they stabilize water protection dams, prevent runoff containing pollutants from landfills, facilitate the revegetation of slopes at risk of erosion, and even make asphalt layers of roads thinner. Until now, textiles made of highly resistant synthetic fibers have been used for this purpose, which have a very long lifetime. For some applications, however, it would not only be sufficient but even desirable for the auxiliary textile to degrade in the soil when it has done its job. Environmentally friendly natural fibers, on the other hand, often decompose too quickly. The German Institutes of Textile and Fiber Research Denkendorf (DITF) are developing a bio-based protective coating that extends their service life.

Textiles are a given in civil engineering: they stabilize water protection dams, prevent runoff containing pollutants from landfills, facilitate the revegetation of slopes at risk of erosion, and even make asphalt layers of roads thinner. Until now, textiles made of highly resistant synthetic fibers have been used for this purpose, which have a very long lifetime. For some applications, however, it would not only be sufficient but even desirable for the auxiliary textile to degrade in the soil when it has done its job. Environmentally friendly natural fibers, on the other hand, often decompose too quickly. The German Institutes of Textile and Fiber Research Denkendorf (DITF) are developing a bio-based protective coating that extends their service life.

Depending on humidity and temperature, natural fiber materials can degrade in the soil in a matter of months or even a few days. In order to significantly extend the degradation time and make them suitable for geotextiles, the Denkendorf team researches a protective coating. This coating, based on lignin, is itself biodegradable and does not generate microplastics in the soil. Lignin is indeed biodegradable, but this degradation takes a very long time in nature.

Together with cellulose, Lignin forms the building materials for wood and is the "glue" in wood that holds this composite material together. In paper production, usually only the cellulose is used, so lignin is produced in large quantities as a waste material. So-called kraft lignin remains as a fusible material. Textile production can deal well with thermoplastic materials. All in all, this is a good prerequisite for taking a closer look at lignin as a protective coating for geotextiles.

Lignin is brittle by nature. Therefore, it is necessary to blend the kraft lignin with softer biomaterials. These new biopolymer compounds of brittle kraft lignin and softer biopolymers were applied to yarns and textile surfaces in the research project via adapted coating systems. For this purpose, for example, cotton yarns were coated with lignin at different application rates and evaluated. Biodegradation testing was carried out using soil burial tests both in a climatic chamber with temperature and humidity defined precisely according to the standard and outdoors under real environmental conditions. With positive results: the service life of textiles made of natural fibers can be extended by many factors with a lignin coating: The thicker the protective coating, the longer the protection lasts. In the outdoor tests, the lignin coating was still completely intact even after about 160 days of burial.

Textile materials coated with lignin enable sustainable applications. For example, they have an adjustable and sufficiently long service life for certain geotextile applications. In addition, they are still biodegradable and can replace previously used synthetic materials in some applications, such as revegetation of trench and stream banks.

Thus, lignin-coated textiles have the potential to significantly reduce the carbon footprint: They reduce dependence on petroleum-based products and avoid the formation of microplastics in the soil.

Further research is needed to establish lignin, which was previously a waste material, as a new valuable material in industrial manufacturing processes in the textile industry.

The research work was supported by the Baden-Württemberg Ministry of Food, Rural Areas and Consumer Protection as part of the Baden-Württemberg State Strategy for a Sustainable Bioeconomy.

Source:

Deutsche Institute für Textil- und Faserforschung Denkendorf (DITF)

(c) nova-Institut GmbH
25.02.2022

Winner of the Cellulose Fibre Innovation of the Year

The annual highlight of the industry is the International Conference on Cellulose Fibres in Cologne, where the latest innovations were showcased: new cellulose fibre technologies for various feedstocks and a wide range of hygiene and textile products as well as alternatives to plastics and carbon fibre for lightweight constructions.

This year, for the first time, there were 230 participants from 27 countries. About 60 were able to attend on site – with strict Corona safety measures – while the others were able to attend online and participate in questions and discussions.

The conference gave deep insights into the promising future of cellulose fibres, which fit perfectly into the current trends of circular economy, recycling and sustainable carbon cycles.

The annual highlight of the industry is the International Conference on Cellulose Fibres in Cologne, where the latest innovations were showcased: new cellulose fibre technologies for various feedstocks and a wide range of hygiene and textile products as well as alternatives to plastics and carbon fibre for lightweight constructions.

This year, for the first time, there were 230 participants from 27 countries. About 60 were able to attend on site – with strict Corona safety measures – while the others were able to attend online and participate in questions and discussions.

The conference gave deep insights into the promising future of cellulose fibres, which fit perfectly into the current trends of circular economy, recycling and sustainable carbon cycles.

An important focus at the conference was alternative sources of cellulose. The increasing demand for cellulose fibres cannot be met in the long run with wood and used textiles alone. At the conference, a variety of agricultural by-products and biogenic waste were presented in presentations and panel discussions, such as orange and banana peels, grain and hemp straw. Much of this is high-volume and has not been put to high-value use so far. Exciting opportunities for the future cellulose fibre industry.

Innovation Award
Live at the conference, host nova-Institute and award sponsor GIG Karasek GmbH granted the “Cellulose Fibre Innovation of the Year” award to one of six highly interesting products.

  • First Winner: Carbon Fibres from Wood – German Institutes of Textile and Fiber Research Denkendorf (Germany)
  • Second Winner: Fibers365, Truly Carbon-Negative Virgin Fibres from Straw - Fibers365 (Germany)
  • Third Winner: Sustainable Menstruation Panties: Application-driven Fibre Functionalisation – Kelheim Fibres (Germany)