|
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.
|