Thesis Details

Thesis Title: An investigation of the effects of changing quality parameters of 100 percent cotton open-end spun yarns on weft insertion performance on air jet weaving
Thesis Author: Charles Rogers
Abstract: Weft yarn in air jet weaving is not positively controlled during insertion so the flight of the yarn during the insertion process is largely influenced by the factors of yarn characteristics. The focus of this research involved an investigation of the weft insertion performance of 100 percent cotton open-end yarns, counts 10/1 N e and 1111 Ne, on an air jet weaving machine and determined which yarn characteristics most significantly impacted weft insertion performance. The methodology of analysis in this research was divided into three main sections. First, yarn properties and variabilities were identified through extensive testing of the yarns. These yarns were processed on the weaving machine and stop rates were documented. Next, statistical examination of the tested yarn parameters and their influence on weft stop level was performed. Lastly, failure cause analysis which provided precise descriptions of yarn failure was organized and behavior patterns were analyzed so that yarn defects observed during processing could be understood. Research results revealed yarn variabilities and variabilities between yarn packages were key influences on performance. Uster percent CV Vb, elongation percent Vb, and Uster hairiness percent Vb each exhibited clear positive relationships to increased weft insertion rates. Yarn hairiness, associated with Uster hairiness, was determined to be a significant influence. Yarn slubs, associated with Classimat major and minor defects, was a major influence on weft stop patterns.