From the Sector

Carbon fiber-reinforced polymer lamellas are an innovative method of reinforcing buildings. There are still many unanswered questions regarding their recycling, however. A research project by Empa's Mechanical Systems Engineering lab is now set to provide answers. Thanks to the support from a foundation, the project could now be launched.

The construction sector is responsible for around 60 percent of Switzerland's annual waste. The industry's efforts to recycle demolition materials are steadily increasing. Nevertheless, there are still end-of-life materials that, for the time being, cannot be reused as recycling would be too time-consuming and expensive. One of these are carbon fiber-reinforced polymer (CFRP) lamellas.

Making buildings "live" longer
The reinforcing method developed by Urs Meier, former Empa Director at Dübendorf, has been used in infrastructure construction for 30 years. CFRP lamellas are attached with epoxy adhesive to bridges, parking garages, building walls and ceilings made of concrete or masonry. As a result, the structures can be used for 20 to 30 years longer. The method is increasingly being applied worldwide – mainly because it massively improves the earthquake resistance of masonry buildings.

"By significantly extending the lifespan of buildings and infrastructure, CFRP lamellas make an important contribution to increasing sustainability in the construction sector. However, we need to find a way how we can further use CFRP lamellas after the buildings are being demolished," explains Giovanni Terrasi, Head of the Mechanical Systems Engineering lab at Empa. To achieve this, he wants to develop a method for recycling CFRP lamellas. Convinced by this idea, a foundation supported it with a generous donation. The project officially launched in October.

Gentle separation
First, a mechanical process will be developed to detach the CFRP lamellas from the concrete without damaging them. Initial tests at Empa are encouraging: After the lamellas were separated from the concrete, they still had a strength of 95 percent – even if they had already been used for 30 years.

Then, the demolished CFRP lamellas shall be used to produce reinforcement for prefabricated components. Terrasi's goal: saving thousands of tons of CFRP lamellas from ending up in landfills after the demolition of old concrete structures and reuse them in low-CO₂ concrete elements. After completion of the project, Giovanni Terrasi and his team – consisting of Zafeirios Triantafyllidis, Valentin Ott, Mateusz Wyrzykowski and Daniel Völki – want to produce railroad sleepers from recycled concrete, which will be reinforced and prestressed with demolition CFRP lamellas. This would give the "waste-to-be" material a second life in Swiss infrastructure construction.

SGL Carbon relies on climate-friendly manufacturing processes in the production of its own carbon fibers. By using renewable energy, the carbon footprint of SGL fiber can be reduced by up to 50% compared to a conventional fiber.  

SGL carbon fiber is produced at the Lavradio (Portugal) and Moses Lake (USA) sites. When the Moses Lake site was selected in the 1990s, the use of hydropower as an energy source played a particularly decisive role. As a result, around 75,000 tonnes of CO₂ can be saved in Moses Lake by purchasing electricity from hydropower plants compared to a fossil fuel-based electricity mix.

As part of the consistent implementation of its climate strategy, SGL Carbon will be using a CO₂-neutral biomass system to generate energy from the beginning of 2024, which will make the production system, which was previously based on natural gas, more flexible and climate-friendly. At full capacity, the biomass system in Lavradio can save more than 90,000 tons of CO₂.

The raw material used is wood pellets, which are sourced from a radius of 250 kilometres via short transport routes.

The climate-friendly energy supply at the site in Moses Lake (USA) combined with the new biomass plant in Lavradio (Portugal) lead to a reduction in CO₂ emissions of up to 50% in the production of SGL's own carbon fibers compared to conventional fibers. With the investment in the biomass system, SGL Carbon is pursuing its climate strategy. The target is to save 50% CO₂ emissions by the end of 2025 compared to the base year 2019 and to be climate-neutral by the end of 2038. In the period 2019 to 2022, SGL Carbon has reduced its CO₂ emissions by 17%.

The kick-off meeting for the "Trends and Design Factors for Hydrogen Pressure Vessels" project, recently held at AZL Aachen GmbH, was a successful event, bringing together more than 37 experts in the field of composite technologies. This event laid a solid foundation for the Joint Partner Project, which currently comprises a consortium of 20 renowned companies from across the composite pressure vessel value chain: Ascend Performance Materials, C evotec GmbH, Chongqing Polycomp International Corp. (CPIC), Conbility GmbH, Elkamet Kunststofftechnik GmbH, F.A. Kümpers GmbH & Co. KG, f loteks plastik sanayi ticaret a.s., Formosa Plastics Corporation, Heraeus Noblelight GmbH, Huntsman Advanced Materials, Kaneka Belgium NV, Laserline GmbH, Mitsui Chemicals Europe GmbH, Plastik Omnium, Rassini Europe GmbH, Robert Bosch GmbH, Swancor Holding Co. Ltd. Ltd., TECNALIA, Toyota Motor Europe NV/SA, Tünkers do Brasil Ltda.

The project follows AZL´s well proven approach of a Joint Partner Project, aiming to provide technology and market insights as well as benchmarking of different material and production setups in combination with connecting experts along the value chain.

The kick-off meeting not only served as a platform to foster new contacts and get informed about the expertise and interests of the consortium members in the field of hydrogen pressure vessels, but also laid the groundwork for steering the focus of the upc oming project's ambitious phases. As a basis for the interactive discussion session, AZL outlined the background, motivation and detailed work plan. The central issues of the dialogue were the primary objectives, the most pressing challenges, the contribut ion to competitiveness, and
the priorities that would best meet the expectations of the project partners.

Discussions covered regulatory issues, the evolving value chain and the supply and properties of key materials such as carbon and glass fibres and resins. The consortium defined investigations into different manufacturing technologies, assessing their matu rity and potential benefits. Design layouts, including liners, boss designs and winding patterns, were thoroughly considered, taking into account their implications for mobile and stationary storage. The group is also interested in cost effective testing m ethods and certification processes, as well as the prospects for recycling into continuous fibres and the use of sustainable materials. Insight was requested into future demand for hydrogen tanks, OEM needs and strategies, and technological developments to produce more economical tanks.

The meeting highlighted the importance of CAE designs for fibre patterns, software suitability and the application dependent use of thermoset and thermoplastic designs.

The first report meeting will also set the stage of the next project phase, which will be the creation of reference designs by AZL's engineering team. These designs will cover a range of pressure vessel configurations using a variety of materials and production concepts. The aim is to develop models that not only re flect current technological capabilities, but also provide deep insight into the cost analysis of different production technologies, their CO₂ footprint, recycling aspects and scalability.

AZL's project remains open to additional participants. Companies interested in joining this initiative are invited to contact Philipp Fröhlig.

Toray Industries, Inc. announced the successful development of recycled carbon fiber (rCF) derived from the production process of the Boeing 787 components using Toray’s advanced carbon fiber, TORAYCA™. The rCF, which is based on pyrolysis recycling process, has been integrated into the Lenovo ThinkPad X1 Carbon Gen 12 as reinforcement filler for thermoplastic pellets. Toray and Lenovo will continue to collaborate to expand the usage of rCF in other Lenovo products.

Toray rCF is the outcome of Boeing and Lenovo’s shared commitment to minimize their environmental impact. Boeing’s objective is to reduce solid waste going to landfill and produce recyclable materials, while Lenovo has been exploring materials to reduce the carbon footprint of their products. Toray rCF connects these visions by repurposing Toray’s high-performance carbon fiber from the Boeing aircraft production process into Lenovo’s ultra-light laptop PC.

TORAYCA™ is an established aerospace material known for its high strength, stiffness, and lightweighting properties. These qualities have led to its adoption in other applications such as electrical and electronic equipment housings, sports equipment, and other industrial applications.

A key advantage of carbon fiber is the ability to retain its primary mechanical properties even after the recycling process. Toray is actively advancing recycling technologies and establishing a strategic business model for rCF. Given that the carbon footprint of rCF is lower than that of virgin carbon fiber, Toray is proactively recommending the adoption of rCF to reduce the environmental impact of customers’ products. This commitment aligns with Toray’s dedication to fostering a circular economy, thereby reducing landfill waste.

With the growing demand among brands and consumers for plastic-free materials and ingredient transparency, VEOCEL™, the flagship specialty nonwovens brand of Lenzing Group, showcased LENZING™ Lyocell Dry fiber at Hygienix 2023. LENZING™ Lyocell Dry fiber which is not classified as “plastic” according to EU SUPD, meets the growing interest for plastic-free nonwoven products across the industry and among consumers. Additionally, along with being an environment-friendly solution, the fiber delivers high-performance dryness and comfort which makes it the optimum fiber choice for absorbent hygiene applications.

Comprised of mostly fossil-based materials, absorbent hygiene products are an essential part of many consumers’ daily lives. With heightened concerns towards environmental impact, the product segment has been undergoing a change caused by shifting consumer preferences, increased consciousness and concerns towards plastic waste, and technology advancement. LENZING™ Lyocell Dry fiber has embraced these changes without compromising on quality or performance.

LENZING™ Lyocell Dry is a cellulosic environment-friendly wood-based alternative to fossil-based fibers. Besides offering great performance features such as liquid management, dryness, gentle-on-the-skin comfort, softness, and quality, LENZING™ Lyocell Dry helps to meet the needs of customers who are aiming to produce plastic-free applications or end products that do not harm the planet without compromising on performance or comfort.

Featuring Lenzing’s unique Dry technology, LENZING™ Lyocell Dry’s hydrophobic characteristics and liquid-controlling properties make it the ideal fiber for absorbent hygiene products. Its high-performing hydrophobicity makes it the optimal choice for a wide range of applications, including baby diapers, feminine care and personal hygiene products as well as adult incontinence products.

The fiber has consistently been tested by Lenzing as the softest* fiber among cellulosic fibers in both dry and wet stages. LENZING™ Lyocell Dry will enable brands and manufacturers to deliver quality hygiene products that provide a high level of comfort, softness, and dryness.

*Lenzing AG softness panel test

Eastman Naia™ Renew cellulosic fiber received Global Recycled Standard (GRS) certification on December 13. This certifies Naia™ Renew recycled content, chain of custody, social and environmental practices, and chemical restrictions.

Textile Exchange, a global non-profit for sustainable change in the fashion and textile industry, manages the GRS certification process. Certification is achieved through an audit from independent third-party certifying body SCS Global Services and applies to the full supply chain and addresses traceability, environmental principles, social requirements, chemical content and labeling.

"We’re honored to add GRS certification to our list of Naia™ certifications that support our sustainability goals,” said Claudia de Witte, sustainability leader for Eastman textiles. “Third-party certifications help us build our brand trustworthiness. It’s our goal to make sustainable textiles available to all, and we do that by building trust with our customers and collaborators. This certification adds even more credibility to our fibers and our sustainability story, which we’re proud to share.”

In June 2023, Textile Exchange made an important announcement regarding its Alternative Volume Reconciliation (VR2) policy, which broadened the range of chemical recycling technologies eligible for mass balance. Notably, this expansion now encompasses gasification, the technical description of Eastman’s molecular recycling technology known as carbon renewal technology. Eastman collaborated with Textile Exchange and other stakeholders to educate the industry about the value and contribution of its molecular recycling technology. This policy update is critical for Eastman because it allows the company’s innovative material-to-material recycling technology to be audited for GRS certification.

Molecular recycling technologies at Eastman break waste down into its molecular building blocks allowing the materials to be used in new materials that are indistinguishable from non-recycled materials. By expanding the GRS to include gasification, the global standard now allows for a broader approach to making sustainable textiles accessible to everyone.

In recent years, the textiles industry has shifted toward circular materials to help tackle one of the largest challenges facing the planet: waste pollution, especially textile waste. Eastman molecular recycling is complementary to mechanical recycling and is a solution for hard-to-recycle waste material, including textiles, which are impacted by factors like fiber blends, chemicals and additives.

Naia™ Renew is produced from 60% sustainably sourced wood pulp and 40% GRS-certified* waste materials that would otherwise be destined for landfills through Eastman's patented molecular recycling technology. The certification verifies the processes of chemical recycling, concentrating, extrusion, and spinning of the undyed yarns and fibers.

 INDA, the Association of the Nonwoven Fabrics Industry, has released an upgraded, more user-friendly version of their International Nonwovens Directory. With enhanced search and navigation features, nonwoven professionals can easily source suppliers or manufacturers based on their product needs.

Some of the search categories include:

• Raw material suppliers
• Nonwoven material suppliers
• Machinery and equipment suppliers
• Converters
• Brand owners and marketers
• Service providers

As part of the Aachen-Dresden-Denkendorf International Textile Conference in Dresden, the Chairman of the Walter Reiners Foundation of the VDMA, Peter D. Dornier, presented awards to four successful young engineers. Two promotion prizes and two sustainability prizes were awarded in the Bachelor and Diploma/Master categories. Academic works in which solutions for resource-saving products and technologies are developed are eligible for the sustainability prizes.

A sustainability prize worth 3,000 euros in the Bachelor's category was awarded to Franziska Jauch, Niederrhein University of Applied Sciences, for her Bachelor's thesis on pigment digital printing in denim production.

The promotion prize in the Bachelor's category, also worth 3,000 euros, went to Annika Datko, RWTH Aachen, for her work on determining the polyester content in used textiles.

Dave Kersevan, TU Dresden, was honoured with a sustainability prize in the Diploma/Master's category, endowed with 3,500 euros. The subject of his thesis was the development of a laboratory system for the production of needled carbon preforms.

This year's promotion award in the Diploma/Master's category, endowed with prize money of 3,500 euros, went to Flávio Diniz from RWTH Aachen. The subject of his Master's thesis was the feasibility of manufacturing ultra-thin carbon fibres.

The award ceremony 2024 will take place in April at the VDMA stand at the Techtextil fair in Frankfurt.

Suedwolle Group introduces ACTIVEYARN®, the company’s first seasonless corporate collection: ACTIVEYARN® is composed of a selection of weaving, flat and circular knitting, hosiery and technical yarns, with advanced spinning technologies, wool blends and other natural and traceable fibres. It is a seasonless collection of yarns suitable for different occasions, to support everyone’s attitude and style.

This idea is expressed by the concept of “Get active”, which is not just about using Suedwolle Group’s products in sports applications, but about a new mindset, a changing perspective. By taking a fresh look at the company’s wide offer, ACTIVEYARN® provides new opportunities and inspiration to explore Suedwolle Group’s full potential in terms of technology, sustainability and innovations. It considers with a new point of view on the collections for knitting, weaving and technical uses, creating new connections among them and offering a mosaic of new possibilities and versatile combinations.

This theme of the collection and the new mindset may be represented in the concept of a “kaleidoscope”, symbol of the active change inspiring Suedwolle Group’s creativity.

The yarns in the ACTIVEYARN® collection embody the company’s six strategic pillars of innovation – sustainability, circularity, traceability, design, performance and technology – drivers of the entire process of design and production.

Jasmin GOTS Nm 2/48 (100% wool 19,5 μ X-CARE) is a natural, renewable and biodegradable yarn with GOTS certification that meets the company’s demand for sustainability. X-CARE, the innovative treatment by Suedwolle Group, uses eco-friendly and chlorine-free substances that make wool environmentally friendly and suitable for easy-care quality.

Tirano Betaspun® RWS FSC (41,5% wool 17,2 μ TEC RWS certified, 41,5% LENZING™Lyocell 1,4 dtex 17% polyamide filament 22 dtex GRS certified) is a fully traceable high performance yarn, suitable for sportswear and activewear.

OTW® Midway GRS Nm 2/60 (60% wool 23,5 μ X-CARE, 40% polyamide 3,3 dtex GRS certified) comes from the recycling of pre-consumer polyamide and thus is a perfect example of circular production. Suitable for weaving, it combines the added performance that comes from our OTW® patented technology applied to a high durability blend, ideal for active garments.

Wallaby Betaspun® Nm 1/60 (87,5% wool 18,4 μ TEC, 12,5% polyamide filament 22 dtex) is the result of application of latest-generation Betaspun® technology to a natural fibre like wool, allowing production of fine yarns with extra strength and abrasion resistance, ideal for seamless and wrap knitting.

Banda TEC X-Compact Nm 2/47 (100% wool 17,2 μ TEC) is a 100% natural, renewable and biodegradable yarn benefitting from the innovative X-Compact, permitting production of particularly linear yarns ideal for clean design and fabrics appropriate for today’s fashions.

Caprera GRS Nm 1/60 (45% wool 19,3 μ Non mulesed X-CARE 55% COOLMAX® EcoMade polyester 2,2 dtex GRS certified) increases the performance of the wool-based non mulesed fibre through combination with COOLMAX® EcoMade polyester. This is a material coming from recycling of post-consumer PET bottles, dyeable at low temperatures, that aids evaporation of moisture from the skin to maintain stable body temperature, enhancing the comfort of activewear and urban garments.

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.