Longitudinal Fiber Distribution in Relation to Rotor Spun Yarn Properties

Abstract

A study of the spinning-in coefficient and critical fiber length ratio in sliver explains the longitudinal behavior of rotor spun yam. The results show that fiber length and parallelization in rotor spun yarn are inferior to those in feed sliver. Yarn tenacity varies linearly with spinning-in coefficient. The sliver linear density and number of drawframe passages have significant correlations with the spinning-in coefficient and critical fiber length ratio in sliver. Too high an opening roller speed leads to excessive fiber breakage, thus reducing the spinning-in coefficient. Too low a speed, on the other hand, causes a reduced degree of fiber separation and orientation, which also results in a low spinning-in coefficient and hence lower yarn tenacity.