COTTON FABRICS PRODUCED WITH TWISTLESS WRAP SPUN YARNS

Properties of fabrics woven with wrap spun yarns and equivalent ring s pun yarns of Upland cotton have been investigated, Experimental wrap s pun yarns were made on a modern, special machine, which produces so-ca lled twistless yarns from staple fibers that are held together by a fi ne multifilament wrap yam. Tile filament wrap used for the experimenta l yarns was. water soluble polyvinyl alcohol. Ring spun yarns were pro duced conventionally. Each kind of yam was woven separately as both wa rp and filling into plain, twill, and sateen fabrics. The water solubl e wrap of;the wrap spun fabrics was removed during normal wet processi ng, yielding completely twistless cotton fabrics. The various fabrics were evaluated for their important mechanical properties. Results show that, compared to the ring spun equivalents, the tighter, plain-woven , twistless fabric (of typical average density) fared reasonably well in tensile breaking strength but was slightly weaker in tearing streng th; the relatively looser twill and sateen twistless fabrics were sign ificantly weaker in both tensile and tear strengths. Respective fabric s of the two yam types, however,showed no significant difference in ab rasion resistance, although the twill and sateen fabrics made with bot h yarns generally had lower flex abrasion resistance than the correspo nding plain fabrics, Twistless fabrics, like their ring spun counterpa rts, maintained their tensile and tear properties after repeated laund ering.