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Know-How For a Better World With Recycled Textile

Definitions, standards and specific industry knowledge. Uster Technologies covers the whole story of recycled textile materials in its application report Sustainability Bulletin No. 1. The publication is part of Uster’s commitment to support the use of recycled materials along the entire textile value chain.

Many consumers today already expect recycled materials to be used in the clothing and home textiles they purchase – and this is clearly pushing innovation throughout the industry. However, there is a degree of uncertainty about what this trend means for yarn producers, both economically and technically. The first Uster Sustainability Bulletin outlines the challenges and presents the solutions.

Starting positions and results

Upstream in textile processing, spinners are often asked to produce yarns with recycled materials, with comparable quality to those from new fiber. “The use of mechanically recycled fibers in spinning has specific quality considerations. Such fibers have a higher short-fiber and nep content and may often be colored, particularly if post-consumer material is used,” says Gabriela Peters, Head of Product Management Laboratory Systems at Uster Technologies and one of the bulletin’s authors.

It is also true that recycled yarns have limitations in terms of yarn fineness. But thermo-mechanically and chemically recycled fibers and filaments are thought to present fewer processing challenges, as they are expected to have similar processing behavior to new fibers and filaments from synthetic and viscose materials.

The Sustainability Bulletin is focused on the more problematic recycled raw material. For example, it deals with the potential difficulties in the various process steps in spinning. The aim is to bring clarity and understanding about mechanically recycled materials and provide ideas on how they can be processed.

Studies have shown that yarns and fabrics produced from recycled fibers may be better for applications where the strength of yarns and fabric is less critical, but where control of unevenness, imperfections, and handle properties is required. Consequently, recycled fibers are most suitable for manufacturing casual clothes such as T-shirts, sweatshirts, and sleepwear. In China, tons of denim jeans trousers are already made of mechanically recycled fibers.

Recycled Textile

The guardian of quality

Uster Technologies sees its role as knowledge provider, setting definitions and standards, to accelerate this ongoing industry transformation. As a long-term trusted supplier of quality control systems to the textile manufacturing industry, Uster assists the industry by evaluating test results. This helps to guide spinners on the current possibilities for dealing with recycled material in its many forms.

The Uster Statistics benchmarks will be helpful in the requirement to measure, control, and improve the quality. The new edition, launched at ITMA 2023, includes for the first time a section for recycled yarn. The Uster Statistics 2023 edition also features an extended range of fiber data, supporting sustainability goals. It’s a fact that an ideal fiber mix – with or without recycled content – must also meet quality requirements for minimal waste.

Uster understands its function as a kind of neutral arbiter, reporting what quality can be expected when processing different recycled materials. Uster know-how on using recycled raw material is collected in the Sustainability Bulletin No. 1 and ready to download free of charge at www.uster.com/sustainabilitybulletin.

Cooperation for a sustainable future

Using recycled materials effectively and efficiently will be a key to success in future years. To achieve acceptable results and profitability, all sections of the textile chain will need to cooperate and learn from each other, to avoid collective failure. “At Uster Technologies, we firmly believe it’s a great opportunity for textile manufacturers to lead this momentous industry transformation, as recycled fibers are the raw material of a sustainable future to be processed into new products,” says Peters.

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