Modifying the Characteristics of Ring and Open-End Yarns

Abstract

Various ways of treating or manipulating yarns to modify their characteristics are discussed. A method of partially untwisting, drawing, and retwisting was seen to give minor improvements in fiber extent and migration, but the resulting improvements in yarn strength were small. The gains in tenacity were more than offset by losses in breaking elongation, and the work of rupture was nearly always reduced. The treatment tended to reduce hairiness. Simple drawing was also shown to give modest improvements in tenacity providing a specific stress of 2 gf/tex or so was not exceeded. The use of wet spinning was shown to give some advantage with cotton because of the activation of natural adhesives and possibly because the wet fibers mutually conformed to a greater extent. The yarns were very smooth, but increases in strength were once again offset by losses in elongation. Wet spinning of man-made fibers showed few or none of these advantages.