Process for producing polyester fibers

Details Process for producing polyester fibers Process for producing polyester fibers

Filed on

1988-12-21

Date issued

1990-05-08

Examiner

Lorin, Hubert C.

Patent Class

Plastic and nonmetallic article shaping or treating: processes

SubClass

Forming continuous or indefinite length work

SubSubClass

Shaping by extrusion

Other Related Categories

264180, 2642108, 26421114, 26421115, D01D 5088, D01D 516

Type

Patent

Status

active

Patent number

049236628

Description

ABSTRACT:
A process for producing polyester fibers having excellent tensile properties, particularly suitable as reinforcement material for tires, belts, etc., involves melt-spinning an ethylene terephthalate polyester to form highly oriented low crystalline polyester filaments which, at the state of being taken-up and prior to being drawn, having birefringence (.DELTA.n) and specific gravity (SG) within the below indicated ranges (a) and (b), and then, without winding-up, subjecting the said filaments immediately to drawing and heat treatment between the first godet rolls and second godet rolls under a draw ratio (DR) defined by the following formulas:

REFERENCES:
patent: 3115385 (1963-12-01), Beck
patent: 3549597 (1970-12-01), Kitson et al.
patent: 3963678 (1976-06-01), Conrad et al.
patent: 4425293 (1984-01-01), Vassilatos

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