Textured polyester yarns and process for the production thereof

Details Textured polyester yarns and process for the production thereof Textured polyester yarns and process for the production thereof

1977-03-28

1978-04-18

Watkins, Donald

Textiles: weaving

Fabrics

Materials

57140J, 57157TS, D03D 1510, D01D 520, D02G 334

Patent

active

040846229

ABSTRACT:
A textured polyester yarn having improved variation in dyeability along its length is composed of a plurality of individual filaments each having thick and thin sections randomly distributed along the filament axis, said yarn having an Uster evenness value of 1.0 to 10.0%, a T index of 3 to 30 and a variation in reflected light intensity in a continuous dyeing test of .+-.0.15 to .+-.0.80 and said yarn preferably having not-untwisted portions containing genuine twists of a fixed direction intermittently retained at random along its length. The yarn is produced by false twisting a polyester yarn composed of a plurality of individual filaments each having variation in cross-sectional area along its length, in which the thick sections have a birefringence of 15 to 80.times.10.sup.-3 and the thin sections have a birefringence of 90 to 200+10.sup.-3, at a temperature of not lower than 180.degree. C and under a twisting tension of 0.05 to 0.8 g/d with a variation with respect to the average twisting tension of .+-.5 to .+-.20%.

REFERENCES:
patent: 2955324 (1960-10-01), Morgan
patent: 3117173 (1964-01-01), Adams
patent: 3127915 (1974-04-01), Bottomley
patent: 3415918 (1968-12-01), Holton et al.
patent: 3964249 (1976-06-01), Werner et al.
patent: 3977173 (1976-08-01), Kosaka et al.
Japanese Patent Publication -- 48-70954/1973, 6/23/73, publication date 2/27/75.

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