Influence of sheath structure on twist and diameter of dref-III polyester-wool blended friction-spun yarn.

Dref-III polyester-wool blended friction yarns having different sheath compositions and structures were spun successfully on a friction spinning machine keeping polyester in core. The sheath composition and structure were changed by varying core content and selectively placing polyester and wool in different layers of sheath. The location of the constituent fibres in sheath was found to affect both twist and yarn diameter. All wool sheath resulted in a bulky yarn with low twist. [ABSTRACT FROM AUTHOR]