Effect of test speed and twist level on the hairiness of worsted yarns

This paper examines the effect of test speed and yarn twist level on the hairiness of worsted yarns. Pure wool yarns of three different twist levels are spun on a worsted ring frame, then tested for hairiness on the hairiness attachment to a Uster Tester 3 at three speeds of 25, 100, and 400 m/min. The results indicate that regardless of the yam's twist level, yarn hairiness tested at 400 m/min is higher than that obtained at 25 and 100 m/min, and the difference is statistically significant at the 5% significance level. But there is no statistically significant difference between hairiness results obtained at 25 and 100 m/min. In addition, yarn hairiness readings in single measurements follow a lognormal distribution.