#Recycling / Circular Economy

2023-11-27

Know-how for a better world with recycled textiles

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.

Uster Technologies issues practical guidance in its new Sustainability Bulletin

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.

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 http://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.

Driving circularity with Uster Recycled Fiber Matrix

The textile industry’s commitment to circularity continues to accelerate, and mechanical recycling is viewed as a targeted approach to cutting textile waste and its environmental impact. At the forefront of this drive, Uster has developed the Recycled Fiber Matrix, a two-dimensional assessment of mechanically recycled fibers to guide optimum processing and end-uses.

Uster’s new Recycling Opening Index guides spinners to the perfect blend

Uster AFIS 6 now offers the key data for better decisions when blending recycled fibers. Process control is decisive in determining the quality and economic outcome. The new R Recycling Module of AFIS 6 introduces the Recycling Opening Index (ROI), so spinners can optimize their circularity credentials. It was officially launched at ITM 2026 in Istanbul, Türkiye.

Measure and control the fiber – optimize yarn quality

Producing consistent yarn quality is an everyday challenge – and a very difficult one. Detailed knowledge and understanding of the fiber raw material is absolutely critical to achieving the best possible quality in the yarn. To help spinners, Uster experts have put together guidelines for avoiding yarn irregularity claims, in a special edition of the Uster News Bulletin.

Uster presents novelties at ITMA Asia + CITME 2025

There’s news from Uster Technologies to be announced for the industry’s upcoming event in Singapore. The Uster 360Q universe is growing with new products, solutions and services. Innovation developments can also be recorded in the fields of man-made fiber testing and fabric inspection. Uster innovations address the industry’s trending topics as mill management and process control, optimization of delivered fabric quality and yield.

From textile waste to spinning-grade fiber: STADLER Group engineers integrated sorting solution for IGERS in Italy

As technology partner, STADLER worked alongside IGERS on its new plant in San Pietro Mosezzo, Novara, from the first process discussions to the final layout – integrating key treatment equipment into one system and supplying the fully automated sorting line. Together, the two companies have taken IGERS' patented textile recycling process from vision to industrial reality.

Toray develops Polyester-Nylon fiber containing at least 93% recycled material by mass

Toray Industries, Inc., announced today that it has developed a polyester-nylon fiber with at least 93% recycled content by mass, based on the total weight of the raw yarn. This percentage applies to the newly developed raw yarn and does not represent the recycled content of the finished fabric or garment.

Canopy shifts focus towards recycling and traceability in updated Hot Button criteria

Environmental non-profit organisation Canopy has introduced revised criteria for its annual Hot Button Report, which evaluates producers of man-made cellulosic fibres (MMCFs), including viscose, lyocell and acetate. The updated framework places greater emphasis on scaling alternative fibre sources, improving supply chain traceability and supporting forest conservation, while maintaining responsible sourcing as a central requirement.