Method of producing acrylic fibers

Details Method of producing acrylic fibers Method of producing acrylic fibers

1986-11-04

1989-04-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264206, 2642108, 26421114, 26421115, D01F 618

Patent

active

048184586

ABSTRACT:
A spinning solution of an acrylonitrile polymer is subjected to dry-wet spinning through an annular type spinneret having a non-perforated part, i.e. a part not formed with spinning orifices, extending from the outer periphery to the inner periphery. The spinneret has more than 3,000 spinning orifices, at the perforated part of the annular portion. The extruded fibers are then passed through a coagulation bath, and the coagulated fibers are then stretched. By this method, uniform acrylic fibers can be produced without causing quality unevenness and fiber defects due to uneven coagulation, filament agglutination, and fluctuation of the gap between spinneret lower surface and liquid surface of the coagulation bath.

REFERENCES:
patent: 2447994 (1948-08-01), Wicker
patent: 2703433 (1955-03-01), Holtzmann
patent: 2736920 (1956-03-01), Wicker
patent: 2798252 (1957-07-01), Cummings, Jr.
patent: 2957748 (1960-10-01), Lieseberg
patent: 3088793 (1963-05-01), Knudsen et al.
patent: 3412191 (1968-11-01), Kitajima et al.
patent: 3558761 (1971-01-01), Tabara et al.
patent: 3667886 (1972-06-01), Gauthier et al.

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