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Abstract:
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Little has been documented regarding open-end spinning short staple, fme denier
polypropylene (PP) fibers. Increasing opportunities for PP yam in apparel and efforts
to reduce PP yam cost have led to process development for open-end spinning PP
yarns in counts comparable to the PP ring spun yarns currently available.
The effect on polypropylene yam quality was studied by varying fiber cohesion,
carding rate, type of card levelling mechanism, one process drawing, and combing
roll speed. This research focused on the high cohesive properties of polypropylene
fibers. Polypropylene fibers require high levels of spin fmish to facilitate processing
on textile equipment. A supplemental study evaluated the effect of rotor speed on PP
yam quality.
Eighteen yam conditions were produced using low and medium fiber cohesion
levels. Results indicated that yarns made with medium cohesion fibers had better
strength, elongation, evenness, and fewer defects. These yam properties were also
highly correlated with rotor speed.
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