Low tensile factor polyester yarn and process

Details Low tensile factor polyester yarn and process Low tensile factor polyester yarn and process

D - Textiles, Paper

02

J

18/624

D02J 13/00 (2006.01) D01D 5/08 (2006.01) D01F 6/62 (2006.01)

Patent

CA 1080923

LOW TENSILE FACTOR POLYESTER YARN AND PROCESS ABSTRACT OF THE DISCLOSURE A process is described for producing polyester filament yarns including the steps of extruding a polyester as filaments, quenching the filaments, annealing the same, gathering the filaments as a yarn and winding the yarn up at 10,000 to 15,000 feet per minute. Yarns of balanced low tensile characteristics, especially low tensile factor (TE1/2) are produced in high speed spinning (e.g. greater than 10,000 fpm) operations including an annealing stage by process control, particularly inverse spinning temperatures for given yarn. Polyethylene terephthalate yarns of balanced tensile characteristics and tensile factor of as little as 15-17 are prepared directly from a spin draw line at maximum productivity by controlling of spinning conditions, particularly polymer intrinsic viscosity, polymer melt viscosity and spinning temperature. The spinning temperature and melt viscosity are coordinated to maximize melt spinning viscosity.

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