Polypropylene is a thermoplastic fiber, it has good deformation and thermal stability. Therefore, the use of false twist deformation method can produce polypropylene stretch yarn.

False twist heating temperature is high, the deformation of the wire is good. But the temperature is too high, will lead to silk strength and elongation decreased, the formation of stiff silk, or even the phenomenon of melting wire adhesion. When the temperature is heated to 150 �� when the wire melt adhesion, when the temperature dropped to 145 ��, the melt adhesion phenomenon disappeared, the decay rate is still high; when the temperature dropped to 140 ��, the breakage rate decreased, false twist operation smoothly The

The false twist is directly related to the curl structure of the false twist yarn. False twist high, curly fine, good appearance. But the false twist is too high, it caused uneven twist, strong stretch. In the appropriate range, the false twist has little effect on the tensile strength of polypropylene elastic yarn.

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