Thesis Details


Thesis Title: The Influence of Fiber Properties and Processing Variables on Rotor Spun Yarn Quality Using 100% Polypropylene Fibers
Thesis Author: Terri Jackson
Abstract: Little has been documented regarding open-end spinning short staple, fme denier polypropylene (PP) fibers. Increasing opportunities for PP yam in apparel and efforts to reduce PP yam cost have led to process development for open-end spinning PP yarns in counts comparable to the PP ring spun yarns currently available. The effect on polypropylene yam quality was studied by varying fiber cohesion, carding rate, type of card levelling mechanism, one process drawing, and combing roll speed. This research focused on the high cohesive properties of polypropylene fibers. Polypropylene fibers require high levels of spin fmish to facilitate processing on textile equipment. A supplemental study evaluated the effect of rotor speed on PP yam quality. Eighteen yam conditions were produced using low and medium fiber cohesion levels. Results indicated that yarns made with medium cohesion fibers had better strength, elongation, evenness, and fewer defects. These yam properties were also highly correlated with rotor speed.