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#Textiles & Apparel / Garment

Reducing the carbon footprint of footwear production

Covestro, textile technology company Huafeng and green fiber technology company Cyclone from China have jointly developed a solution to produce high-quality running and sports shoes in a much more sustainable way than before: recycled fabric made from CYCLONE® recycled polyester (rPET) yarns is used as the shoe upper and selectively coated using Huafeng's HAPTIC® technology.

In the process, Huafeng uses a polyurethane (PU) dispersion from the INSQIN® portfolio of Covestro, half of whose carbon content comes from bio-based raw materials. The greenhouse gas emissions for each pair of shoes produced in this way are around 230 grams of CO? equivalent less than a pair using conventional fossil-based PU dispersions and virgin PET fabric.

3D HAPTIC® textile printing with partially bio-based INSQIN® system on recycled PET

Successful cooperation with textile and yarn technology companies in China

Covestro, Huafeng and Cyclone have developed a material solution to produce high-quality running and athletic shoes much more sustainably than before. © HUAFENG Textile Technologies
Covestro, Huafeng and Cyclone have developed a material solution to produce high-quality running and athletic shoes much more sustainably than before. © HUAFENG Textile Technologies



"This is good news for anyone who wants to maintain an athletically active, healthy lifestyle in the most environmentally friendly way possible," says Tony Wu, Global Marketing Manager, Textile Coatings, Covestro. He emphasizes that the increased sustainability achieved does not compromise the durability, appearance or comfort of the footwear upper. In combination with Huafeng HAPTIC® printing technology, 3D shapes can be applied to textile fabrics creating trendy designs and high performance in athletic footwear. 

 


Impranil® eco DLS, as a partially bio-based binder, is part of the INSQIN® range of waterborne textile coating resins. Its use contributes to reduced greenhouse gas emissions with around 60 grams of CO? equivalents per pair of shoes. The value comes from internal calculations verified by independent external experts. It is obvious that the difference in the CO? footprint becomes even greater when solvent-based PU textile coatings are used for comparison. The use of fabric based on recycled PET yarns mitigates greenhouse gas emissions by about 170 grams of CO? equivalent per pair of shoes.

In production, Huafeng uses Covestro's Impranil® eco DLS polyurethane dispersion, half of whose carbon content comes from biomass, as well as recycled PET fibers from Cyclone and its own HAPTIC® technology. © Covestro
In production, Huafeng uses Covestro's Impranil® eco DLS polyurethane dispersion, half of whose carbon content comes from biomass, as well as recycled PET fibers from Cyclone and its own HAPTIC® technology. © Covestro


To share the experience and findings with the industry, Covestro, Huafeng and Cyclone jointly hosted a webinar globally to introduce the three technologies and the synergy created from this co-development. The recorded webinar can be accessed here:

https://www.bilibili.com/video/BV1v44y1n7RA

"Sustainability is key to our market success at Huafeng. With the help of the partially bio-based PU dispersion of Covestro, we were able to introduce more renewable ingredients into our HAPTIC® coatings, further improving their sustainability," says Dr. Thomas Schmidt, Director of Innovation at Huafeng. Dr. Torsten Pohl, Head of Global Textile Coatings at Covestro, adds, "The combination of our partially bio-based INSQIN® PU coating binder with Huafeng HAPTIC® printing on recycled PET fabric shows how partners in the value chain can work together creating more sustainable products."



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