Product and process

Details Product and process Product and process

1977-05-02

1978-09-26

Gorenstein, Charles

Textiles: spinning, twisting, and twining

Apparatus and processes

Elements

57157F, 428374, D02G 116, D02G 304

Patent

active

041159896

ABSTRACT:
Polyester yarn having the desirable crimp properties of false-twist textured, heat-set yarn is produced from melt-spun and drawn bicomponent filaments wherein poly(ethylene terephthalate) of 12 to 15 relative viscosity is one component and a copolyester of 23 to 26 relative viscosity, preferably poly(ethylene/2,2-dimethyl-1,3-propylene terephthalate) containing about 90 mole percent ethylene terephthalate units, is the other component. The bicomponent filaments are annealed at constant length to crystallize the polyethylene terephthalate component, forwarded in a jetted stream of heated compressible fluid, impinged in a plasticized condition against a moving screen, cooled and then taken up from the screen. The process can be operated continuously at high speeds, e.g., windup speeds of 3,000 to 4,000 meters per minute.

REFERENCES:
patent: 3454460 (1969-07-01), Bosley
patent: 3462938 (1969-08-01), Melita
patent: 3558760 (1971-01-01), Olson
patent: 3785135 (1974-01-01), Seem et al.
patent: 3800374 (1974-04-01), Ozawa et al.
patent: 3854177 (1974-12-01), Breen et al.
patent: 3861133 (1975-01-01), Frankfort et al.

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