Crepe Yafn Studies.:Part 9 : Analysis of Untwisting Moment of Crepe Yarn When Wetted
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According to theoretical consideration, untwisting moment T of crepe yarn wetted is composed of T<SUB>1</SUB> and T<SUB>2</SUB>, where T<SUB>1</SUB> is determined by the force f<SUB>1</SUB> developed in the composed filaments due to swelling recovery of strains which are given during twisting and set by twist setting treatment, and T<SUB>2</SUB> is determined by the force f<SUB>2</SUB> developed in composed filaments when they are stretched slightly due to cross-sectional swelling of the yarn. The present article studies how T<SUB>1</SUB> and T<SUB>2</SUB> appear in twisted yarn of viscose rayon, acetate, silk, nylon and terylene. <BR> Results obtained are:<BR> 1) T for viscose rayon is determined by T<SUB>1</SUB> and T<SUB>2</SUB>, but T<SUB>2</SUB> is much greater than T<SUB>1S</SUB>, and T in low twist range is dominated only by T<SUB>2</SUB>. This explains why the untwisting moment of viscose rayon is a relatively high value despite the softening of composed fibers when wetted.<BR> 2) For silk twisted yarn, untwisting moment is determined only by T<SUB>2</SUB>. In the usual dry twisted yarn, T<SUB>1</SUB> does not appear. This is because the fiber strain recovers to its limit value during the twist setting process.<BR> 3) For acetate, both T<SUB>1</SUB> and T<SUB>2</SUB> appear, and, as in viscose rayon, T<SUB>2</SUB> is much greater than T<SUB>1</SUB>.<BR>For acetate, however, the degree of cross-sectional swelling S is so small that T<SUB>2</SUB> cannot fully grow as in viscose rayon, although f<SUB>2</SUB> which determined T<SUB>2</SUB> is much greater than that of viscse rayon.<BR> 4) For nylon and terylene, the untwisting moment is determined only by T<SUB>1</SUB>. In these fibers, force relation to T<SUB>1</SUB> is not one due to swelling recovery of set strains, but one due to thermo-contraction of stretched fibers.
- 社団法人 日本繊維機械学会の論文
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