I was reading a thesis and saw this sentence,
Recover (Spain) takes post-industrial cotton waste and shreds the fibre to upcycle it into yarn. By colour sorting the waste materials, they have carrier fibre to strengthen the yarns, such as recycled plastic bottles (Source: Circular Speeds: A Review of Fast and Slow Sustainable Design Approaches for Fashion and Textile Applications)
I tried to find the meaning of carrier fibre, and from an interview with the Spanish company I saw the same phrase as well:
NOMADIX: WHAT ARE RECOVER TEXTILES MADE FROM?
Isaac Nichelson: Recover yarns are made from mechanically recycled cotton derived from pattern cutting waste and pre/post consumer garments. Recover Upcycled Cotton fiber is blended with RPET fiber made from post consumer recycled plastic bottles as a carrier fiber to make the softest, finest recycled cotton yarns know to man… also considered the lowest impact yarns available today. (Source: AN INTERVIEW WITH THE CHIEF SUSTAINABILITY OFFICER OF RECOVER TEXTILES)
But I couldn't find any website that explains what carrier fibre is. Can anyone help?