Steam drawing of polyester monofilament to improve loop strength

Details Steam drawing of polyester monofilament to improve loop strength Steam drawing of polyester monofilament to improve loop strength

1977-04-07

1978-07-04

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

264DIG28, B29C 1702

Patent

active

040988643

ABSTRACT:
There is provided a method of improving the properties of polyester monofilaments in respect to loop strength and resistance to fibrillation. The process contemplates treating an undrawn substantially noncrystalline extensible spun linear polyethylene terephthalate monofilament with a vapor medium such as steam and, while the monofilament is exposed to such vapor, drawing the monofilament at a draw ratio of from 1.5:1 to 4:1 and further drawing the monofilament in a subsequent drawing operation to an aggregate draw ratio of from 4:1 to 10:1.
The process enables development of the maximum or a desired loop strength value for the particular monofilament being processed with optimization of specific drawing conditions such as the steam pressure within the indicated draw ratios. Thus, drawn monofilaments having loop strength values of at least 2.5 grams/denier are provided, and the drawn products are particularly useful as reinforcing elements in rubber bodies, e.g. tire cords.

REFERENCES:
patent: 2615784 (1952-10-01), McClellan
patent: 2664009 (1953-12-01), Emerson
patent: 2934400 (1960-04-01), Siggel et al.
patent: 3452132 (1969-06-01), Pitzl

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