Texturing of Thermoplastic Yarns

Abstract

An analysis of the heat transfer effectiveness of heating technologies pertaining to false twist yarn texturing has shown that contact heating used in modern commercial machines is limited as to further increases of the heat transfer rate. With a condensation heating process using high pressure steam, yarn temperature rise time can be reduced by a factor of ten when the steam condenses only on the outer yarn surface. A con densation heating chamber, a friction texturing system and a series of texturing ex periments conducted with them helped to establish the feasibility of such heating period reduction. With a condensation heating system, textured yarns possessing sat isfactory crimp and mechanical quality can be produced with much shorter heater residence times than currently used. Required minimum cooling zone residence times are also reduced due to evaporation of condensate on the yarn surface upon exit from the condensation chamber.

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