Techniques for Torque Modification of Singles Ring Spun Yarns

Abstract

This article reports on a systematic study of various spinning techniques to produce torque-free singles ring spun yarns on a modified ring frame. The modification units, including optional fiber separation devices and a false twist device, were incorporated into the conventional ring spinning frame so that the balanced or reduced yarn residual torque could be achieved in one step. Three modification systems were proposed and two of them were investigated on a ring frame to produce pure cotton singles yarns. The spirality of the resultant single jersey knit fabrics was greatly reduced. Properties and performance characteristics of control and modified yarns, as well as their resultant fabrics, were evaluated, including yarn tensile properties, hairiness, evenness, snarling, burst strength, air permeability, handle, and pill resistances.