Process for producing anti-pilling acrylic fiber

Details Process for producing anti-pilling acrylic fiber Process for producing anti-pilling acrylic fiber

1973-09-13

1976-08-17

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

039754863

ABSTRACT:
The present invention relates to a process for producing an anti-pilling acrylic fiber which has excellent level dyeing properties. This process involves dissolving an acrylonitrile in an inorganic solvent to prepare a spinning solution, wherein the inorganic solvent in the spinning solution is 40-70%, subjecting the spinning solution to wet-spinning by extrusion through spinneret orifices into a coagulation bath containing an inorganic solvent in an amount of 50-70% of that in the spinning solution, while maintaining the linear velocity ratio of free extrusion at 1 or higher and the jet stretch ratio 1.5 or higher, stretching the formed gel fibers 3-7 times the length in hot water or in a heated steam medium at 80.degree.-120.degree.C, drying the stretched fibers and then subjecting the fibers to a relaxation treatment in a hot air current at a temperature of 150.degree.C or lower or in a wet heat atmosphere at a temperature of 120.degree.C or lower. The jet stretch ratio is defined as being the quotient obtained by dividing the takeup speed of the coagulated filaments from the coagulation step by the linear velocity of extrusion of the spinning solution through the spinneret orifices.

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patent: 3885013 (1975-05-01), Sato

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