Recycled Yarn Technology: rPET, Recycled Cotton, Eco-Wool

rPET is produced from post-consumer PET bottles via mechanical recycling: bottles are collected, sorted, and cleaned, then shredded into flake, melted into chip, and melt-spun into filament yarn. The mechanical recycling route preserves the polymer backbone, resulting in fiber with the same molecular structure — and therefore the same physical properties — as virgin polyester.

Tenacity of mechanically recycled rPET is 3.5–5.5 cN/dtex, identical to virgin PET. Wash colorfastness (ISO 105-C06) achieves 4–5 grades. The primary sustainability advantage is carbon footprint: lifecycle analysis consistently places rPET’s carbon emission at 50–60% lower than virgin polyester, primarily from eliminating petroleum extraction and polymerization steps. GRS (Global Recycled Standard) certification is the industry standard for rPET scarf yarn. Important caveat: the vast majority of commercial rPET is recycled from bottles, not from textile waste. Textile-to-textile chemical recycling remains at early commercial/pilot scale as of 2026.

Recycled cotton is sourced from two streams: pre-consumer (cutting waste and yarn off-cuts from garment manufacturing) and post-consumer (worn or discarded garments). Both streams undergo mechanical processing: fabric or garments are sorted by color, then shredded mechanically back into fiber.

The key limitation of mechanical recycling is fiber length. Virgin cotton staple runs 25–55mm; mechanical shredding reduces recycled cotton fiber to 5–20mm. Short staple produces weaker yarn with higher surface fuzz, which is why recycled cotton is almost always blended — typically 30–50% recycled content with virgin cotton or polyester — to achieve acceptable tensile performance. Tensile strength is 15–30% lower than equivalent virgin cotton. Water usage in recycled cotton production is approximately 3–8% of that required for virgin cotton field-to-fiber, a significant environmental benefit. RCS (Recycled Claim Standard) is the applicable certification for content claims.

Recycled wool — historically called “shoddy” — is recovered from pre-consumer wool fabric offcuts and post-consumer wool garments. The process involves sorting by color (to minimize re-dyeing), followed by mechanical shredding in a garnetting or tearing machine that opens the fabric back to individual fibers, and re-spinning into yarn.

Recycled wool is used primarily in blended scarves, commonly combined with virgin wool, recycled polyester, or acrylic to achieve acceptable mechanical properties. Performance is lower than virgin wool: tensile strength is typically 20–30% reduced, and color consistency is challenging because the input material varies batch to batch. Recycled wool is most common in budget-to-mid-market ranges. Note: RWS (Responsible Wool Standard) applies to virgin wool; recycled wool content uses RCS for certification of recycled claims.