Theoretical Analysis of the Twist Structure of Friction Yarns
Vol. 53, No. 4, pp. 221-228,
Aug. 2016
10.12772/TSE.2016.53.221
PDF
Abstract
During friction yarn formation, fiber fleece is fed continuously into the gap between two surfaces moving at different speeds to build a bundle. This bundle is then pulled out of the gap and taken up onto a bobbin. During this process, the bundle obtains twists that are generated in two forms-one by fiber arrangement and the other by torque. Twists are generated in two zones, which are the friction zone and the take-up zone. Therefore, the total twists can be obtained by adding all twists occurring in the two zones. The presented research reports the structural characteristics of the friction yarn based on theoretical twist models. The yarn structure represented by the arrangement of the constituent fibers is analyzed by simulation of the theoretical models. Results show that the fiber arrangement twists are directionally opposite to the torque twists in the friction zone; for example, fiber arrangement twists are S-twists and torque twists are Z-twists. In the take-up zone, the twist generation occurs in the Z-direction. Thus, the total twist per length of the friction-spun yarn is uniformly distributed along the bundle radius. More specifically, the resultant overall twist is zero, theoretically.
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