Method of producing a polyester filament yarn having a high leve

Details Method of producing a polyester filament yarn having a high leve Method of producing a polyester filament yarn having a high leve

1978-02-22

1979-08-14

Gorenstein, Charles

Textiles: spinning, twisting, and twining

Apparatus and processes

Twist setting

57290, D02G 300

Patent

active

041641167

ABSTRACT:
The present invention relates to a method of producing a twisted polyester filament yarn having a high level of twist used for a woven or knitted crepe fabric.
A method of this invention comprises imparting a high level of twist to a polyester filament yarn which has particular properties, and heat setting said twisted polyester filament yarn. The first of these properties which the polyester filament yarn has is that a boil-off shrinkage in boiling water is in the range of 0% to 5%. The second is that a thermal shrinkage stress at 140.degree. C. in hot air is more than 0.03 g/de. The third is that a ratio of a thermal shrinkage stress at 180.degree. C. in hot air to a thermal shrinkage stress at 140.degree. C. is more than 1.0.
The polyester filament yarn which has above mentioned properties can be obtained by repeating heat treatment several times at a temperature from 160.degree. C. to 220.degree. C. in hot air, stretching the polyester filament yarn in a range of 2% to 10% and successively shrinking it in the same range, or by being subjected to heat treatment at a temperature from 160.degree. C. to 220.degree. C. in hot air, shrinking restrictively the polyester filament yarn in a range of 0% to 10% under the relaxed state.

REFERENCES:
patent: 3886722 (1975-06-01), Hou et al.
patent: 3936999 (1976-02-01), Ikeda et al.
patent: 3977175 (1976-08-01), Yoshikawa et al.

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