Thesis Details

Thesis Title: The effect of crimp frequency and crimp retention on air jet spinning stop levels and yarn quality
Thesis Author: Russell Matoy
Abstract: Crimp plays an important role in the processing of synthetic fibers. Crimp is necessary for the fiber to be carded, but is not desirable when the fiber is spun. This means that a careful balance must be struck in setting the permanence of the crimp in the fiber. If the permanence is low, the fiber will not card properly. If the permanence is too high, the fiber will not spin well. Very little work can be found about the impact of crimp on yarn quality, and even less about the effect on stop levels. Information about the impact on air jet spinning stop levels is virtually non-existent. This thesis investigated the effect that crimp frequency and crimp retention have on air jet spinning. For this study, nine bales of polyester with differing levels of crimp and crimp retention were produced. These fibers were then processed exactly the same, with the exception of the use of two different total drafts at breaker drawing, to determine the effect the fiber differences had on spinning stops and yarn quality. The results of this research indicate that fibers with a high amount of crimp give the best spinning efficiency. Fiber with the lowest crimp permanence produces the best yarn quality. This study indicates that a fiber with a high amount of crimp, which is easily removed after carding, will provide optimal spinning performance and yarn quality.