From the Sector

STFI will be presenting high-end textile products and solutions at Techtextil 2024. The highlights from current research results and innovations provide an insight into the digitalisation of textile production, show applications for 3D printing and smart technical textiles and provide examples of particularly sustainably designed products as well as innovative approaches for protective and medical textiles.

The central highlight of STFI's presence at Techtextil is a robot system that demonstrates the automated processing of a bobbin frame on a small scale. The pick-and-place application demonstrates camera-supported gripping of the bobbins. The robot is part of the STFI's “Textile Factory of the Future” which demonstrates automation solutions for the textile industry in a laboratory environment.

From the field of sustainable products and solutions, a sleeping bag with bio-based and therefore vegan filling material and a natural fibre-based composite element for furniture construction, in which LEDs and capacitive proximity sensors for contactless function control have been applied using embroidery technology, will be on show. Printed heating conductor structures demonstrate current research work for the e-mobility of the future, as the individually controllable seat and interior heating should ultimately reduce weight and save energy compared to conventional heating systems.

While a protective suit for special task forces protects against the dangers of a Molotov cocktail attack, a shin guard and a knee brace with patellar ring illustrate the process combination of 3D printing and UV LED cross-linking. Other highlights from lightweight textile construction include the rib of a vertical rudder of an Airbus A320 and a green snowboard made from recycled carbon fibres.

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.

From Resource-efficient and Recycled Fibres for Textiles and Building Panels to Geotextiles for Glacier Protection: Six award nominees present innovative and sustainable solutions for various industries in the cellulose fibre value chain. The full economic potential of the cellulose fibre industry will be introduced to a wide audience that will vote for the winners in Cologne (Germany), and online.

Again nova-Institute grants the “Cellulose Fibre Innovation of the Year” award in the context of the “Cellulose Fibres Conference”, that will take place in Cologne on 13 and 14 March 2024. In advance, the conferences advisory board nominated six remarkable products, including cellulose fibres from textile waste and straw, a novel technology for dying cellulose-based textiles and a construction panel as well as geotextiles. The innovations will be presented by the companies on the first day of the event. All conference participants can vote for one of the six nominees and the top three winners will be honoured with the “Cellulose Fibre Innovation of the Year” award. The Innovation award is sponsored by GIG Karasek (AT).

In addition, the ever-growing sectors of cellulose-based nonwovens, packaging and hygiene products offer conference participants insights beyond the horizon of traditional textile applications. Sustainability and other topics such as fibre-to-fibre recycling and alternative fibre sources are the key topics of the Cellulose Fibres Conference, held in Cologne, Germany, on 13 and 14 March 2024 and online. The conference will showcase the most successful cellulose-based solutions currently on the market or those planned for the near future.

The nominees:

The Straw Flexi-Dress: Design Meets Sustainability – DITF & VRETENA (DE)
The Flexi-Dress design was inspired by the natural golden colour and silky touch of HighPerCell® (HPC) filaments based on unbleached straw pulp. These cellulose filaments are produced using environmentally friendly spinning technology in a closed-loop production process. The design decisions focused on the emotional connection and attachment to the HPC material to create a local and circular fashion product. The Flexi-Dress is designed as a versatile knitted garment – from work to street – that can be worn as a dress, but can also be split into two pieces – used separately as a top and a straight skirt. The top can also be worn with the V-neck front or back. The HPC textile knit structure was considered important for comfort and emotional properties.

HONEXT® Board FR-B (B-s1, d0) – Flame-retardant Board made From Upcycled Fibre Waste From the Paper Industry – Honext Material (ES)
HONEXT® FR-B board (B-s1, d0) is a flame-retardant board made from 100 % upcycled industrial waste fibres from the paper industry. Thanks to innovations in biotechnology, paper sludge is upcycled – the previously “worthless” residue from paper making – to create a fully recyclable material, all without the use of resins. This lightweight and easy-to-handle board boasts high mechanical performance and stability, along with low thermal conductivity, making it perfect for various applications in all interior environments where fire safety is a priority. The material is non-toxic, with no added VOCs, ensuring safety for both people and the planet. A sustainable and healthy material for the built environment, it achieves Cradle-to-Cradle Certified GOLD, and Material Health CertificateTM Gold Level version 4.0 with a carbon-negative footprint. Additionally, it is verified in the Product Environmental Footprint.

LENZING™ Cellulosic Fibres for Glacier Protection – Lenzing (AT)
Glaciers are now facing an unprecedented threat from global warming. Synthetic fibre-based geotextiles, while effective in slowing down glacier melt, create a new environmental challenge: microplastics contaminating glacial environments. The use of such materials contradicts the very purpose of glacier protection, as it exacerbates an already critical environmental problem. Recognizing this problem, the innovative use of cellulosic LENZING™ fibres presents a pioneering solution. The Institute of Ecology, at the University of Innsbruck, together with Lenzing and other partners made first trials in 2022 by covering small test fields with LENZING™ fibre-based geotextiles. The results were promising, confirming the effectiveness of this approach in slowing glacier melt without leaving behind microplastic.

The RENU Jacket – Advanced Recycling for Cellulosic Textiles – Pangaia (UK) & Evrnu (US)
PANGAIA LAB was born out of a dream to reduce barriers between people and the breakthrough innovations in material science. In 2023, PANGAIA LAB launched the RENU Jacket, a limited edition product made from 100% Nucycl® – a technology that recycles cellulosic textiles by breaking them down to their molecular building blocks, and reforming them into new fibres. This process produces a result that is 100% recycled and 100% recyclable when returned to the correct waste stream – maintaining the strength of the fibre so it doesn’t need to be blended with virgin material.
Through collaboration with Evrnu, the PANGAIA team created the world’s first 100% chemically recycled denim jacket, replacing a material traditionally made from 100% virgin cotton. By incorporating Nucycl® into this iconic fabric construction, dyed with natural indigo, the teams have demonstrated that it’s possible to replace ubiquitous materials with this innovation.

Textiles Made from Easy-to-dye Biocelsol – VTT Technical Research Centre of Finland (FI)
One third of the textile industry’s wastewater is generated in dyeing and one fifth in finishing. But the use of chemically modified Biocelsol fibres reduces waste water. The knitted fabric is made from viscose and Biocelsol fibres and is only dyed after knitting. This gives the Biocelsol fibres a darker shade, using the same amount of dye and no salt in dyeing process. In addition, an interesting visual effect can be achieved. Moreover, less dye is needed for the darker colour tone in the finished textile and the possibility to use the salt-free dyeing is more environmentally friendly.
These special properties of man-made cellulosic fibres will reassert the fibres as a replacement for the existing fossil-based fibres, thus filling the demand for more environmentally friendly dyeing-solutions in the textile industry. The functionalised Biocelsol fibres were made in Finnish Academy FinnCERES project and are produced by wet spinning technique from the cellulose dope containing low amounts of 3-allyloxy-2-hydroxypropyl substituents. The functionality formed is permanent and has been shown to significantly improve the dyeability of the fibres. In addition, the functionalisation of Biocelsol fibres reduces the cost of textile finishing and dyeing as well as the effluent load.

A New Generation of Bio-based and Resource-efficient Fibre – TreeToTextile (SE)
TreeToTextile has developed a unique, sustainable and resource efficient fibre that doesn't exist on the market today. It has a natural dry feel similar to cotton and a semi-dull sheen and high drape like viscose. It is based on cellulose and has the potential to complement or replace cotton, viscose and polyester as a single fibre or in blends, depending on the application.
TreeToTextile Technology™ has a low demand for chemicals, energy and water. According to a third party verified LCA, the TreeToTextile fibre has a climate impact of 0.6 kg CO2 eq/kilo fibre. The fibre is made from bio-based and traceable resources and is biodegradable.

With its new sustainability label Autoneum Blue, Autoneum combines the use of recycled materials with protecting the oceans and social responsibility. Autoneum Blue is a continuation of the LABEL blue by Borgers®, which was originally launched by Borgers Automotive. Following the acquisition of the German automotive supplier in April 2023, Autoneum has now fully integrated the label into its sustainable product portfolio.

Marine pollution has reached alarming levels in recent decades, with plastic contamination posing one of the most harmful threats to the health of the world’s largest ecosystem. In light of ever-stricter legal requirements for the environmental performance of vehicles, especially regarding the recycled content of components and their end-of-life recyclability, the reduction and recycling of plastics is also one of the key challenges for the automotive industry. Autoneum Pure, the Company’s sustainability label for technologies with an excellent sustainability performance throughout the product life cycle, is already successfully helping customers to tackle these challenges. With Autoneum Blue, Autoneum is now expanding its sustainable product portfolio with a label for components that combine the use of recycled material with protecting the oceans and social responsibility.

In order to qualify for the Autoneum Blue label, components must be based on materials that consist of at least 30% recycled PET that was collected from coastal areas within a 50-kilometer range of the water. These credentials mean the products make an important contribution to preventing plastic pollution in the oceans. In addition, the process of collecting the PET bottles must be socially respon-sible and comply with human rights, and traceable procurement of the bottle flakes must be guaran-teed. Autoneum Blue thus complements the Company’s strategic target to continuously reduce water consumption in all areas of its operations with an additional focus on preventing plastic pollution of the oceans.

Autoneum currently offers selected wheelhouse outer liners, needlepunch carpets and trunk side trim under the Blue label. In principle, however, the label could be extended to any product based on Autoneum technologies that feature recycled polyester fibers. As an addition to Autoneum’s existing fully recyclable monomaterial polyester constructions, which are characterized by waste-free production and have a significantly lower carbon footprint compared to products made from virgin fibers, Autoneum Blue presents another example of the Company’s ongoing efforts and continuous strides towards a sustainable circular economy.

Faster and more cost-effective carbon fibre production - the technology of the start-up CarboScreen comes a good deal closer to this dream. The founders Dr. Musa Akdere, Felix Pohlkemper and Tim Röding from the Institut für Textiltechnik (ITA) of RWTH Aachen University are using sensor technology to monitor carbon fibre production, thereby doubling the production speed from the current 15 to 30 m/min in the medium term and increasing turnover by up to €37.5 million per year and system. This ground-breaking development also impressed the jury at the ITMF at their Annual Conference in Keqiao, China, and was honoured with the ITMF StartUp Award 2023 on 6 November 2023.

Dr. Musa Akdere accepted the award on behalf of the CarboScreen founding team.

Carbon fibres can only develop their full potential if they are not damaged during production and further processing. Two types of fibre damage occur more frequently during fibre production: Superficial or mechanical damage to the fibres or damage to the chemical structure.

Both types of damage cannot be optimally detected by current means or only become apparent after production, to name just two examples. This leads to higher production costs. In an emergency, faulty production can even lead to plant fires. For this reason, and to ensure good production quality, the system is run at 15 m/min below its production capacity for safety reasons. However, 30 m/min or more would be possible. With the sensor-based online monitoring of CarboScreen, the production capacity can be doubled to 30 /min. This would lead to higher production, resulting in lower manufacturing costs and wider use of carbon fibres in mass markets such as automotive, aerospace and wind energy.

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.

Polartec, will upgrade two of its product platforms now using Biolon™ *, plant-based nylon fiber and membrane setting a new standard in sustainability for performance fabrics. Polartec®  Power Shield™ and Power Stretch™ Pro fabrics containing Biolon™ fibers and membranes will premiere this autumn.

Biolon™ is a renewable, non-GMO plant-based nylon with a 50% lower carbon footprint than virgin Nylon 6,6.  Biolon™ nylon properties  are closer to Nylon 6,6 than many recycled nylon alternatives currently on the market.  Biolon™ has re-worked a staple, making the best, better in terms of performance and sustainability. Its plant-based inputs account for approximately half (45-48%) of the nylon content in the fibers and membranes in new Polartec® Power Shield™ and Power Stretch™ Pro fabrics debuting this fall.

Ramesh Kesh, Senior Vice President – Government & Defense and Polartec at Milliken & Company said, “For a long time, many thought that sustainable options meant a loss in performance, like durability, Polartec has proved that this is not the case. Challenging a technology already considered to be at the pinnacle of performance was a big ask yet the team at Polartec rose to that challenge and we believe we have created a new standard in sustainability for performance fabrics.” 

The combination of high strength and rigidity with sustainability and a neutral carbon footprint makes flax the ideal raw material for natural fibre-reinforced plastics. vombaur offers composite textiles made of this natural fibre for the automotive, wind power, construction or sports industries and many other sectors.

Flax fibres are rigid and tear-proof. They have natural bactericidal properties, are virtually antistatic, stain resistant and easy to spin. Humans have taken advantage of these properties to manufacture robust, stain-resistant and lint-free textiles. Between the late 19^th and late 20^th centuries, cotton largely replaced natural fibres. Because flax can be grown in Europe and consumes less energy and water than cotton production, the material's importance is currently growing again, for both clothing and composites. Regional textile value added chains in Europe – flax makes them possible.

Ideal mechanical properties
vombaur makes the mechanical properties of flax usable for lightweight design. Because flax fibres are particularly rigid and tear-resistant, they ensure great stability in natural fibre-reinforced plastics (NFRPs). And thanks to their low density of 1.50 g/cm3, the fibres weigh virtually nothing. On top of this, fibre-reinforced plastics are less prone to splintering than glass fibre-reinforced plastics.

Excellent carbon footprint
The cultivation of flax binds CO₂ and the production of natural fibre-reinforced plastics (NFRPs) generates approximately one third less CO₂ emissions compared with conventional fibre-reinforced plastics. Energy consumption is substantially lower. This saves resources. The use of flax fibre tapes by vombaur in lightweight design applications also improves the product's carbon footprint and contributes to a secure, regional supply chain.

Recycling without impacting on quality
Flax offers another sustainability benefit: more recycling cycles than glass- or carbon fibre-reinforced plastics – without impacting on quality. Thermoplastic fibre-matrix prepregs are melted and reused in the recycling process. The natural fibres can be used in other products such as natural fibre-reinforced injection moulded parts.

Sustainable product developments for many industries
"Orthoses for high-performance sports, high-tech skis, wind turbines, components for the automotive industry or aerospace, but also modern window profiles – the application scope for our lightweight design flax tapes is amazingly diverse", as Carl Mrusek, Chief Sales Officer at vombaur explains. "After all, wherever flax tapes are used, three key properties come together: light weight, strength and sustainability".

Beaulieu International Group will turn the spotlight on geotextile products with sustainability benefits to support progress in resilient civil engineering projects at the 12^th ICG Rome from 18^th -21^st September 2023, presenting options to target fossil carbon reduction by choosing PP-based staple fibres or woven geotextiles that are among the lowest in carbon footprint for geosynthetics.

For manufacturers of nonwoven geotextiles, Beaulieu Fibres International (BFI) offers PP fibres with > 25% carbon footprint reduction compared to the European standard PP fibres, generating 1.48 kg CO₂/kg PP fibres. A step further is to accelerate the replacement of fossil carbon in engineered fibre applications by choosing its ISCC Plus certified bio-attributed MONO-PP with a negative carbon footprint.

For construction projects, nonwoven geotextiles made with high-tenacity HT8 fibres are proven to secure a longer service lifetime and reduce the environmental impact, as they offer high mechanical performance at a reduced weight.

Beaulieu Technical Textiles' (BTT) woven geotextiles provide a wide range of functions, including separation, filtration, reinforcement and erosion control, and are among the most sustainable in the industry. Depending on weight, the carbon footprint of its woven geotextiles (m²) ranges between 0.37 and 1.40 kg CO₂ eq./m². They also minimize the use of natural resources for more sustainable infrastructure development. Case studies such as at the Ostend-Bruges airport highlight significant CO2 reduction on the jobsite by replacing the transport of 960 trucks of gravel with 3 trucks of woven geotextiles, and by extending the runway’s life span.

The ICG launch of its new line Terralys MF woven filtration geotextiles with monofilament boosts the performance of a common solution in building layers that require high water flow rates. High-tenacity extruded polypropylene tapes and monofilaments are interwoven to form dimensionally stable and highly permeable geotextiles. These new filtration geotextiles provide greater resistance to dirt and biological clogging. They allow water to travel freely while reducing soil erosion when employed as a separation and stabilizing layer.

As of September 2023, all PP staple fibres and woven geotextiles will have Environmental Product Declarations (EPD) based on LCAs. Each EPD is an essential tool for communicating and reporting on the sustainability performance and helps carbon-conscious customers in their purchasing and decision making. Registered EPDs are globally recognized, publicly available and free to download through EPD Libraries.

INDA, the Association of the Nonwoven Fabrics Industry, announced the finalists that will compete for the RISE^® Innovation Award. RISE^®, the Research, Innovation & Science for Engineered Fabrics Conference, will take place September 26-27 at Talley Student Union, North Carolina State University, Raleigh, NC.

The finalists who will present their product innovations on Tuesday, September 26th, include:

ESC-8 – The JOA® Electronic Size Change Unit by Curt G. Joa, Inc.
The JOA^® ESC-8™ unit allows unprecedented Adult Pant design flexibility with the ability to process nearly limitless combinations of insert and chassis sizes at industry best speeds. Additionally, this technology enables the production of a greener, more sustainable product by eliminating up to 250 tons of material, 5 tons of glue, and 500 tons of greenhouse gas emissions every year.

BicoBio Fiber by Fiberpartner ApS
The BicoBio Fiber is a bicomponent fiber core sheath construction, developed from materials with a low carbon footprint. This fiber is designed to biodegrade in the environments where most plastics are found: landfills and the ocean. The fiber’s BioBased PE is produced from sugar cane and has a negative carbon footprint. The fiber’s recycled PET is GRS certified. PrimaLoft^® Bio™, a technology that enables polyester fibers to biodegrade, is utilized in the production of BicoBio Fibers. These fibers can be processed with a variety of nonwoven technologies.

Reifenhäuser Reicofil RF5 XHL by Reifenhäuser REICOFIL GmbH & Co. KG
Reicofil XHL (Extra High Loft) is the game changer for a super soft and drapeable nonwoven offering an incomparable feel the nonwoven market has never seen before. The outstanding soft touch is unique and intended for use in the hygiene sector. XHL focuses on low basis weight and high thickness with the best visual appearance. The high performance and efficient use of raw materials and energy ensure cost-effectiveness and environmentally-friendly production.

SAPMonit by TiHiVE
TiHive’s game-changing innovation, SAPMonit – a visionary French technology breakthrough – inspects millions of diapers weekly. SAPMonit delivers lightning-speed inline inspection of Super Absorbents weight and distribution, optimizes resources, detects flaws, and accelerates R&D. SAPMonit utilizes advanced see-through cameras, high-speed vision algorithms, and secure cloud integration, revolutionizing industry norms. SAPMonit has great potential for sustainability, cost reduction, and enhanced customer satisfaction.

The RISE Innovation Award winner will be announced Wednesday afternoon, September 27^th.