Process for manufacturing polyethylene terephthalate industrial

Details Process for manufacturing polyethylene terephthalate industrial Process for manufacturing polyethylene terephthalate industrial

1990-04-04

1992-04-07

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421117, D01F 662, D01D 512

Patent

active

051026031

ABSTRACT:
An improved process for manufacturing highly uniform industrial yarn which exhibits high tenacity, high modulus and very low shrinkage which comprises melt spinning polyethylene terephthalate into spun filaments and subsequently drawing the spun filaments in a heated zone to a draw ratio of at least about 1.05:1; wherein the spun filaments have a birefringence of at least about 0.075 and a crystallinity of at least about 10%; wherein the spun filaments are in the heated zone for a residence time of at least 0.3 seconds; and wherein the yarn in the heated zone is at a temperature which is between the glass transition temperature and the melting temperature of the polyethylene terephthalate.

REFERENCES:
patent: 3452132 (1969-06-01), Pitzl
patent: 4113821 (1978-09-01), Russell et al.
patent: 4405686 (1983-09-01), Kuroda et al.
patent: 4654253 (1987-03-01), Brown et al.
patent: 4755587 (1988-07-01), Rinehart
Becker/Braun Kunstoff-Handbuch, vol. 7, "Polyurethanes", Carl Hanson Verlag, 1983.

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