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 fou r different speeds of 20, 60, 100, and 140 m/min using the latest Shirley S DL096/98 hairiness/friction meter. Contrary to previous results obtained fo r similar yarns using other commercial hairiness meters, we observe a reduc tion in yam hairiness with increased test speed. We also examine the effect s of yam guide, yam angle, and rewinding on yam hairiness. The results indi cate that hair direction, air drag on hairs, and frictional rubbing of the yam being tested have a significant effect on yam hairiness. We postulate t hat the different trends of speed effects on yarn hairiness from different hairiness meters may stem from differing contact conditions between the yar ns and the various yam guides on the respective hairiness meters. Such diff erent trends also suggest that reconciling hairiness results from different hairiness meters may be difficult.