Strength and Elongation of a Single Staple Yarn:Part2 : Single Staple Yarn Composed of Uniform Fibers and Twisted Beyond Optimum Twist

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概要

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• Twist shrinkage, strength and elongation of a single staple yarn composed of uniform fibers and with twist exceeding the optimum condition have been studied theoretically, and the following results obtained:<BR>(1) Twist shrinkage under optimum twist, k<SUB>1</SUB>, can be expressed as<BR>k<SUB>1</SUB>=1+(log cosθ<SUB>R0</SUB>)cosθ<SUB>R0</SUB>/1-cosθ<SUB>R0</SUB><BR>whereθ<SUB>R0</SUB>;Twist angle at yarn surface.<BR>(2) Yarn's breaking elongation beyond optimum twist decreases gradually, but has some exceptions.<BR>(3) Beyond optimum twist, yarn breaking strength F<SUB>b</SUB> is expressed as<BR>F<SUB>b</SUB>=0.975N(a+e'<SUB>b</SUB>cosθ<SUB>R30</SUB>)cos θ<SUB>r3b</SUB><BR>where e'<SUB>b</SUB>=(yarn breaking elongation)/0.975<BR>N : Number of fibers in a yarn section<BR>a, b : Constants of fiber strength<BR>θ<SUB>R30</SUB> : Twist angle at yarn surface, when yarn strain is zero.<BR>cosθ<SUB>r3b</SUB> : Mean of fiber inclination to yarn axis when yarn is broken.

• 社団法人 日本繊維機械学会の論文

著者

• 久間 秀彦

  信州大学繊維学部

関連論文

• Strength and Elongation of a Staple Yarn:Part 1 : Staple Yarn Composed of Uniform Fibers and Twisted under Optimum Condition
• Strength and Elongation of a Single Staple Yarn:Part2 : Single Staple Yarn Composed of Uniform Fibers and Twisted Beyond Optimum Twist

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