Production of high tenacity, low shrink polyester fiber

Details Production of high tenacity, low shrink polyester fiber Production of high tenacity, low shrink polyester fiber

1991-02-22

1994-01-11

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642896, 2642905, 2642907, D01D 512, D01D 516

Patent

active

052778584

ABSTRACT:
In a continuous process for the production of high strength polyester yarn with enhanced low shrinkage the improvement comprising maintaining the traveling yarn about a pair of heated draw rolls for a period of at least 0.25 seconds, maintaining the air temperature in the region about said traveling yarn for said period at a temperature of at least 220.degree. C., said draw rolls each having a surface temperature of at least 220.degree. C. and a substantial portion of its surface with a surface roughness value of at least 50 microinches, whereby said yarn is heated sufficiently to obtain a substantial relaxation between said heated draw rolls and said relaxation roll system, thereby providing enhanced low shrinkage. Polyethylene terephthalate industrial yarn having an intrinsic viscosity of at least 0.78, a dry heat shrinkage DIN.sub.177 of less than 2.0%, a dry heat shrinkage DIN.sub.200 of less than 4.5%, and a tenacity of at least 7.2 grams per denier is a part of the invention.

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