Mechanics of Texturing Thermoplastic Yarns

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Abstract
The nature of transient changes in twist distribution across the texturing threadline has indicated the presence along me threadline of regions with widely differing torsional rigidities. The current study serves to confirm this variation in rigidities, indicating the presence of torsionally soft spots at the entry to the cold zone and at the entry to the heater. The remaining segments of the threadline reflect torsional response to incremental twist changes which are orders of magnitude greater than the torsional formation response to twisting at the soft spots. Thus, the threadline responds to changes in line torque and/or spindle speed by increasing or decreasing twist at the soft zones, and these changes must propagate across the cold and hot zones before steady-state conditions at new twist levels can be achieved.

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