Thesis Details


Thesis Title: The Effects of Flow Rate, Wind Angle, Yam Tension, and Compression upon Levelness of Dyeing and Unwinding Performance of 100% Polyester Two-Ply Yam Packages
Thesis Author: David Allegood
Abstract: Package dyeing frequently has the following two significant drawbacks: nonuniform package densities that can lead to unlevel dyeing within yarn packages and an additional processing step (backwinding) following dyeing. Packages with nonuniform densities offer a quality challenge to the dyer since a primary goal of package dyeing is to evenly penetrate all areas of the packages with dye liquor to ensure levelness and repeatability. Backwinding offers a cost challenge to the package dyer because it becomes an additional processing step whose costs either have to be absorbed by the producer or passed on to the customer. Limited research has been conducted regarding dyeing levelness and unwinding performance involving changes in the construction of two-ply yarn packages at the two-for-one twister, a process that typically requires random winding. Furthermore, investigations into the effects of press packing at the kier and its effects upon dyeing levelness and unwinding performance of two-ply packages are also limited. For this research, two-ply polyester packages were dyed with liquor flow rate and package construction variations to determine the effects upon dyeing levelness and unwinding performance. Rieter-Scragg's PPA3 was used to evaluate unwinding performance. Packages were also dyed under two levels of compression to determine the effects upon dyeing levelness and unwinding performance.