Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1983-01-06
1984-05-15
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642108, D01F 618
Patent
active
044487401
ABSTRACT:
The present invention provides a process for producing acrylic fibers having excellent surface smoothness and a color development ratio not less than 105%, without generating numerous wrinkles peculiar to wet spinning. The process comprises wet-spinning an acrylonitrile polymer spinning solution of from 50.degree. to 70.degree. C. having a viscosity of from 40 to 200 poises at 30.degree. C., (a) with a spinning draft of from 0.05 to 0.2 in the case wherein the spinnerette orifice capillary length is 0.5 mm or less, and (b) with a spinning draft of from 0.13 to 2.0 in the case where the spinnerette orifice capillary length exceeds 0.5 mm; coagulating and water-washing the resulting fibers substantially without stretching; and thereafter wet-heat-stretching the fibers not less than 4 times in length at a temperature not lower than 80.degree. C.
REFERENCES:
patent: 3621087 (1971-11-01), Shimamura et al.
patent: 3814739 (1974-06-01), Takeda
patent: 3885013 (1975-05-01), Sato
patent: 3975486 (1976-08-01), Sekiguchi et al.
patent: 3976737 (1976-08-01), Sekiguchi et al.
Sawanishi Shigeru
Shiomi Yozo
Yamane Akira
Japan Exlan Company Limited
Woo Jay H.
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