Over-end unwinding involves pulling yarn from a fixed package to be used in textile processes such as knitting, sewing, twisting, weft insertion in weaving, and doubling. During unwinding, the yarn slides on the package surface and lifts off into the balloon formed between the package and the guide eyelet. Variations in yarn tension and balloon shape can adversely affect process effciency and final product quality. This paper investigates the steady-state motion of inextensible yarn during unwinding. Previously developed models that prredict the yarn tension and motion in the unwinding balloon and on the package surface are modified to include the effects of nonzero wind angle packages and to allow comparison with experimental results.
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