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MODULUS CHARACTERISTICS OF SPUN YARNS.

  • 출판일1992.12
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 234
The yield point in stress-strain curves for yarn indicates the level of load after which permanent deformation occurs. In cotton yarns, the yield point is difficult to predict. Instead, the modulus-elongation curve based on tensile tests is a better indicator of performance. Modulus is a measure of the resistnace of a yarn to small extensions. High modulus yarn are relatively inextensible. A study of various yarns, including cotton, polyester polyester/cotton, and polyester/viscose, showed variations in modulus at 1,2,3,and 4 percent stress-strain levels. polyester and its blends had higher modulus values than cotton. Sizing improved modulus by about 2.6 times up to stress-strain level of 2 percent. Ring spun yarns had a 55 percent higher modulus than rotor spun yarns.
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