Process for making high shrinkage acrylic fibers

Details Process for making high shrinkage acrylic fibers Process for making high shrinkage acrylic fibers

1975-06-20

1977-03-08

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264210F, D01F 618

Patent

active

040112942

ABSTRACT:
High-shrinkage acrylonitrile polymer fibers that shrink with unusually high shrinkage force are prepared by a process in which as-spun, dry-spun filaments are extracted to remove solvent by passing the filaments continuously through aqueous baths at 63.degree. to 75.degree. C., drawn between 1.5X and 3.5X during passage through the baths, and cooled to a temperature below 50.degree. C. If the filaments are cooled while free of tension, the filaments are further drawn 1.1X to 1.5X while passing continuously through at least one aqueous bath at 70.degree. to 80.degree. C. If the filaments are cooled under tension, the further drawing step is unnecessary. In either case the filaments are dried at a temperature no higher than 60.degree. C. The filaments may be crimped at 55.degree. to 65.degree. C. in a stuffer box prior to drying. The filaments may be cut to staple fibers for use in pile fabrics; they are particularly useful in preparing artificial furs.

REFERENCES:
patent: 3097415 (1963-07-01), Davis
patent: 3180913 (1965-04-01), Veitch et al.
patent: 3330898 (1967-07-01), Hauley et al.
patent: 3739054 (1973-06-01), Wieden et al.
patent: 3932571 (1946-01-01), Dworjanyn

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