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Analysis on Hairiness Shedding of Cotton Yarn in Warp Knitting

To solve the problem that the hairiness on the surface of the cotton yarn will fall off during the warp knitting process which may cause broken-end defect, the number of surface hairiness, breaking strength and breaking elongation rate of conventional cotton yarn and compact-spun cotton yarn were tested during they pass through various yarn guides on a warp knitting machine, so as to reflect the degree of hairiness shedding. The test results show that the hairiness of both the conventional cotton yarn and the compact-spun yarn increased with the rise of yarn feeder's amount, while it decreased rapidly when the yarns were repeatedly rubbed by the guide needles; the breaking strength and the breaking elongation rate of both kinds of yarn declined when the yarns contact with yarn guide, and the breaking strength and the breaking elongation rate of the former decreased much more than the latter at the guide needle. Thus, it can be speculated that most hairiness fall off at the guide needle.
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