A New Geometncal Structure and optimum Heat-Setting for Thermo-Plastic Yarns

概要

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A new type of heat-setting has been tried to obtain a coil-shaped structure having a polygonal or circular cross-section and an arbitrary pitch for thermoplastic yarns, and the optimum condition for heat setting has been obtained for Nylon 6, Terylene, Tetron and Saran. The results are as follows: (1) The degree of heat-setting, for yarns, set in a circularly coiled shape is defined by a method by which a minor difference in heat-setting can be measured quantitatively. (2) The optimum condition for heat-setting is shown below which may differ slightly due tovariations in the manufacturing processes of samples. Sample Heating Temp. Heating Time °C in air (min) in paraffin (min) Saran 130 5 1 Nylon 6 160 5 1 Terylen 170 5 1 Tetoron 170 5 1 (3) The degree of heat-setting of yarns can be explained by the phenomena of stress-relaxation. (4) Yarns set in a coiled shape ; is applicable in improving fabric hand, cushion effect, thermal insulation, filtering effect, etc.
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