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Abstract:
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Since the introduction of the air jet spinning machine in the early 1980's, air jet
spinning has been unable to have significant impact on the knitting industry.
Specifically, air jet yarns produce an objectionable streaky appearance in single-jersey
knit fabrics due to poor mid-term evenness and numerous long thin places, preventing
air jet yarns to be practical for knitted apparel applications.
In an effort to improve the quality of air jet yarn for it to be practical for singlejersey
knit fabrics, this research focused on the effects of different fiber and spinning
parameters on mid-term evenness and long thin places and ultimately single-jersey
knit fabric appearance. The effects of Nl pressure, N2 pressure, main draft, total
draft, feed ratio, spinning speed, fiber length and apron spacer on mid-term evenness
and long thin places were investigated. The study determined that Nl pressure, main
draft and total draft had the biggest impact on these yarn properties. The study also
determined that differences in yarn mid-term and short-term evenness could be
detected in single-jersey knit fabrics.
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