Thesis Details


Thesis Title: The Effects of Combing Roll Wire, Surface, and Speed on Quality Properties of 100% Cotton and 50/50 Polyester/Cotton Open-End Yarns
Thesis Author: Todd Dailey
Abstract: One of the basic machine components of open-end spinning is the combing roll, utilized for fiber separation. Because fiber opening is the first stage of the open-end spinning process, optimum fiber separation at the combing roll becomes a principal factor affecting yarn quality and spinning performance. Combing roll wire, surface, and speed are parameters for proper fiber separation with minimal fiber damage. Both 100% cotton and 50/50 polyester/cotton open-end yarns were spun using a variety of combing roll parameters. Physical yarn properties were statistically analyzed to determine the effects of wire, surface, and speed of the combing roll on yarn quality. In this research, increases in combing roll speed were observed to deteriorate several yarn properties. Combing roll wire and surface also influenced many physical properties of 100% cotton and 50/50 polyester/cotton yarns. The following list identifies the specific findings of this research: 1. For 24/1 100% cotton yarns, higher combing roll speeds deteriorated single-end strength and elongation. Minor increases were observed in U ster hairiness and lint shedding with increased combing roll speed. 2. For 50/50 polyester/cotton yarns, increases in combing roll speed resultedin losses for single-end strength and elongation. Minor deteriorations in yarn appearance and lint shedding were detected with higher combing roll speeds. 3. Based on the ITT MQC96 overall quality ranking, the OB20/4 diamondnickel wire roll produced the highest quality index for the 12/1 100 % cotton and 20/1 50/50 polyester/cotton yarns; the OB20/4 uncoated wire produced the highest quality index for the 24/1 100 % cotton yarns. 4. The OB20/4 diamond-nickel combing roll was found to be suitable for both 100% cotton and 50/50 polyester/cotton open-end spinning applications.