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Internal Structure and Properties of DREF-3 Yarns.

  • 출판일2000.04
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 249
Researchers used tracer fiber techniques to analyze the internal structure of cotton yarns spun on the DREF-3 system using various spinning drum speeds, delivery speeds, and throttle diameters. Core Fibers had a twisted rather than a parallel configuration. Faster delivery speeds increased fiber extension, reduced twist levels, and reduced the packing coefficient. Increases in spinning drum speed, however, reduced fiber extension, increased fiber twist, and increased the packing coefficient. Twist in the leading end of the sheath fibers was less than that of the trailing end. Sheath twist was greater than core twist. Larger throttle diameters reduced the fiber reversal percentage. Yarn tenacity increased with increasing spinning drum speed. Uster percentage and the incidence of thick places, thin places, and neps first decreased at delivery speeds of up to 200 meters per minute and increased at higher delivery speeds. 8 refs.
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