Thesis Details

Thesis Title: The Influence of Modern Carding Parameters on Fiber Alignment in Slivers and the Resulting Impact on Open-End Yarn Quality
Thesis Author: Daren Barnes
Abstract: One of the latest trends in yarn manufacturing is the move toward shorter processing steps between the card and the spinning frame. Previous research in this area shows that fiber alignment may be the most important single factor in the determination of short cut methods of producing yarn. Currently in yarn manufacturing, the drawing process is being used to attain the fiber alignment needed for certain yarn properties. The objective of this research was to determine what variables at carding significantly affect card sliver fiber alignment on four modern high performance cards and how improved alignment will impact drawn sliver and open-end yarn quality. Conditions representative of the range of fiber alignment levels obtained at carding were selected for further processing. One third of each card sliver condition selected went directly to spinning. Another third of each condition was processed through one pass of leveled drawing. The remaining card sliver was processed through both breaker and finisher draw frame passes, with the finisher pass being leveled. The following list identifies the specific findings of this research: 1. Significant differences can be made in card sliver fiber alignment by manipulating'card settings, components, 'and speeds. 2. Fiber alignment in card sliver can impact the alignment achieved with one process and two processes of drawing. 3. As fiber parallelization increases·, the 50-yard CV %, neps, and thin places decrease in open-end yarns, while single-end strength levels increase.