Mechanics of Texturing Thermoplastic Yarns

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Abstract
This paper reports on the transient behavior of the texturing threadline in single heater operation. Twist response and threadline-tension response are shown for disturbances in spindle speed, overfeed, outlet velocity, and entry pretension. The twist response in the texturing zone is exponential in form, with local twist levels shifting without overshoot to new levels consistent with new steady-state values of process parameters. Transient twist response in the post-spindle zone involves a rise, then falling off to zero real twist. Transient-tension behavior is seen as a dual response both to new steady-state process parameter levels and also to threadline contractive effects of changing twists. Twist changes are observed to initiate in the heater entry zone of the threadline and then sweep across to the spindle. This observation suggests the existence of significant differences in torsional rigidity along the threadline and requires modification of analytical models for predicting transient texturing behavior.

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