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Abstract

A thermal model of yam during texturing with condensation heating has been developed so as to predict yam temperature response. Yarn temperature rise during the condensation heating process is dictated by the internal conduction of the yarn and hardly varies with the surface heat transfer coefficient. On the other hand, the cooling effect due to evaporation upon threadline emergence from the high pressure steam chamber depends on the final thickness of the condensate layer, which is a function of yarn speed. Yarn speed also has a considerable effect on the rate of tem perature decrease during the convective cooling processes. Measurements of yarn tem perature in the cooling zone of the experimental false twist process are in good agree ment with predictions. Yarn quality is also consistent with the temperature history of the yarn.

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References

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Texturing of Thermoplastic Yarns

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