Thesis Details

Thesis Title: An evaluation of the effects of percent size add-on, slasher stretch, and pre-wet slashing on the characteristics and predicted weaving performance of Murata Vortex spun yarns
Thesis Author: J. Scott McDaniel
Abstract: Ring spinning has traditionally been the major production unit for spun yam manufacturing. In the last 30 years, new innovations in spinning have produced different types of spinning machines. The open-end spinning machine was the first successful type of spinning machine other than ring spinning. Murata introduced the Murata Jet Spinner (MJS), which forms yam by the air jet principle. The MJS machine offered significant productivity advantages over ring spinning. A limitation to the MJS machine is its inability to successfully spin 100% carded cotton fibers. In 1997, Murata introduced the Murata Vortex Spinner (MVS) No. 851 as its newest spinning machine. The new MVS machine uses a vortex of air to entangle the fibers and can successfully spin 100% carded cotton as well as blends of fibers. The objective of this research was to evaluate the impact of percent size add-on, slasher stretch, and pre-wet sizing on the yam properties and predicted weaving performance ofMVS yams. Specifically, five different levels of size add-on (6%,8%, 10%,12%, and 14%), three different levels of slasher stretch (1.5%,2.0%, and 2.5%), and normal versus pre-wet slashing were used to evaluate changes in MVS yam properties and on simulated weaving abrasion resistance. Two different counts and blends of yam were used and the MVS yam was compared against yam produced from two other spinning systems. The first experiment compared a 2011 Ne 100% cotton MVS and ring yam. The second experiment compared a 35/1 Ne 50/50 polyester/cotton MVS and MJS yam.The results of this research indicate that the MVS yarn performs similarly to other yarn types during slashing. At higher size add-on levels, above 8-10%, the MVS yarn has a higher resistance to abrasion, higher single-end strength, and fewer hairs. ~Tith the addition of size, the single-end elongation ofthe MVS yarn decreases. Stretch also significantly affects the MVS yarn properties. The MVS yarn exhibited the best tensile properties when sized with lower levels of slasher stretch. The abrasion resistance of the sized MVS yarn was higher than that of the sized ring or sized MJS yarn. In addition, the MVS yarn took on more size than the ring yarn for the 20/1 Ne experiment, while the MJS yarn took on more size than the MVS yarn for the 3511 Ne experiment.