Process for preparing high strength polyamide and polyester fila

Details Process for preparing high strength polyamide and polyester fila Process for preparing high strength polyamide and polyester fila

1977-09-01

1978-09-12

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264176F, D01D 512

Patent

active

041138210

ABSTRACT:
Preparation of improved yarns from synthetic linear polymer filaments by melt spinning followed by substantially immediately heating said filaments above their second order transition temperature and drawing said filaments substantially instantly at a temperature in the range of from about above their second order transition temperature to within about 5.degree. C. of their melting point, said heating being preceded by pretensioning of said filaments at a constant tension level greater than about 0.005 gram per denier and less than a tension level required to draw said filaments.

REFERENCES:
patent: 3216187 (1965-11-01), Chantry et al.
patent: 3361859 (1968-01-01), Cengato
patent: 3715421 (1973-02-01), Martin et al.
patent: 3936253 (1976-02-01), Fisher et al.

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