Process for producing high shrinking acrylic fiber

Details Process for producing high shrinking acrylic fiber Process for producing high shrinking acrylic fiber

1973-09-13

1976-08-24

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

039767370

ABSTRACT:
The present invention relates to a process for producing high shrinking acrylic fibers which have excellent antipilling properties and dyeing characteristics. This process involves dissolving an acrylonitrile polymer in an inorganic solvent to prepare a spinning solution containing the inorganic solvent in a concentration of 40-70%, subjecting the spinning solution to a wet-spinning by extruding through spinnerette orifices into two coagulating baths, while maintaining the linear velocity ratio of free extrusion at 1 or higher and maintaining a jet stretch ratio of 1.5 or higher, stretching the formed swollen gel fibers to 3-7 times the length in hot water or in a heated steam medium at 80.degree.-120.degree.C, drying the stretched fibers, then subjecting the fibers to a secondary stretch of 1.05 to 1.60 times the length, wherein the first coagulating bath has an inorganic solvent concentration of 50-70% of that in the spinning solution. The jet stretch ratio is defined as being the quotient obtained by dividing the take-up speed of the coagulated filaments from the coagulating baths by the extrusion linear velocity of the fiber-forming polymer through the spinnerette orifices.

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