Mechanics of Texturing Thermoplastic Yarns

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Abstract
This is a report on the effect of machine settings and filament properties on PET threadline behavior in single-heater false-twist texturing. Filament migration upon yarn entry to the cold region is shown to persist throughout the texturing zone, but some added migration is evident over the heater. Threadline tension, as a function of heater temperature, closely follows the pattern of thermomechanical behavior of untwisted feed yarn. Added twist, in commercial range, reduces threadline tensions. Tension ratio also falls with twist increase. Configuration of threadline is studied throughout the texturing zone as a function of twist, and the effect of line buckling is noted. Minimum heating and cooling times for steady-state operation and for maximum product crimp are noted.

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