An Experimental Study of the Effect of Test Speed on Yarn Hairiness

In this paper, we examine the hairiness of ring and rotor spun yarns at four different speeds of 20, 60, 100, and 140 m/min using the latest Shirley SDL096/98 hairiness/ friction meter. Contrary to previous results obtained for similar yarns using other com mercial hairiness meters, we observe a reduction in yarn hairiness with increased test speed. We also examine the effects of yarn guide, yarn angle, and rewinding on yarn hairiness. The results indicate that hair direction, air drag on hairs, and frictional rub bing of the yam being tested have a significant effect on yarn hairiness. We postulate that the different trends of speed effects on yarn hairiness from different hairiness meters may stem from differing contact conditions between the yarns and the various yam guides on the respective hairiness meters. Such different trends also suggest that reconciling hairiness results from different hairiness meters may be difficult.