Tension of Viscose and Nylon Yarn in Running State.Part 2

概要

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The effects of draft, amplitude of elongation and running speed on yarn tension when periodic elongations are imposed on a running filament yarn drafted between two have been studied. Fur-thermore, approximate methods to estimate the yarn tension when the abovementioned parameters are known, are discussed here. Major results obtained from our study are as follows :<BR>(1) To calculate yarn tension, it facilitates matters if we divide the tension into two parts, statical and dynamical.<BR>(2) If the maximum amplitude of vibrational elongation is less than 1 %, the principle of super-position is applicable, in any range of draft, to the calculation of yarn tension vibration.<BR>(3) Since the internal friction of yarn influences yarn tension less than external friction does, yarn tension can be calculated with good approximation from a mechnical model of spring, if there are no resonance elements on the passage of yarn.<BR>(4) When a spring is substituted for the mechanical model of yarn, apparent spring constant, denoted by the ratio of vibration amplitude tension and elongation, increases with an increase in draft. This increase in ratio is remarkable in nylon yarn. When the amplitude of vibrational elongation increases, the apparent spring constant decreases.
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