Process for production of polyester threads

Details Process for production of polyester threads Process for production of polyester threads

1973-12-11

1976-12-21

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264290T, 264342RE, D01D 512

Patent

active

039989216

ABSTRACT:
The invention is related to a process for the production of improved, low shrinkage, highly oriented polyester threads which comprises melt spinning a polyester thread, stretching said thread in hot water and shrinking said thread from 3 to 22 % in hot air at temperatures of from 5.degree. to 40.degree. C below the melting point of the polyester over a period of from 3 to 30 seconds. The improved service properties of monofilaments produced in this way are reflected in an increase in the ultimate tensile strength coupled with an increase in elongation, in a shrinkage of less than 1% on boiling, in a heat-included shrinkage of at most 10% at a temperature of 195.degree. C (exposed for 30 minutes in air) and in a very high 2nd moment.

REFERENCES:
patent: 2615784 (1969-08-01), McClellan
patent: 3159964 (1964-12-01), Kretsch
patent: 3413797 (1968-12-01), Chapman
patent: 3562382 (1971-02-01), Fowler
patent: 3564835 (1971-02-01), Keefe et al.
patent: 3583878 (1971-06-01), Ragep et al.
patent: 3739056 (1973-06-01), Evans et al.
patent: 3838561 (1974-10-01), Munting

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