Crepe Yarn:Part 7 : Change of Cross-Sectional Area of Twisted Yarn when Wetted.

概要

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The influence of yarn structure on the cross-sectional swelling of twisted yarn when wetted has been studied with the following results obtained on viscose rayon, acetate, silk, nylon and Terylenepolyester yarns : 1) The cross-sectional area of nylon and Terylene twisted yarn does not swell at all when wetted, that of acetate swells slightly but is not affected by twist. The cross-sectional area of viscose rayon and silk swells considerably and is affected by twist, i, e., the degree of swelling decreases an increase in yarn twist. 2) The degree of cross-sectional swelling S for viscose rayon varies with yarn count even with the same number of twists. However, when S is plotted against yarn compactness, it lies close to a definite curve independently of yarn count or the number of twists, showing that S can be expressed as a function of yarn compactness. 3) Since yarn compactness depends on the transverse compression σcn upon the neutral layer formed in the yarn at the time of twisting, S can be related to σen, where σen is approximately a function of filament strain εR of the outermost layer. In this way, the following empirical formula for S can be derived : S=S0 εR0 / εR where S0 is the degree of cross-sectional swelling (0, 67 for Viscose fiber), and εR0 is an experimental constant (0.056),
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