Process for the production of dry-spun hollow polyacrylonitrile

Details Process for the production of dry-spun hollow polyacrylonitrile Process for the production of dry-spun hollow polyacrylonitrile

1982-06-09

1984-02-21

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264177F, 2642091, D01F 618

Patent

active

044329237

ABSTRACT:
Hollow polyacrylonitrile fibers having a uniform closed cavity structure are obtained by dry-spinning filament-forming acrylonitrile polymers from a solution through a spinning jet comprising annular jet bores of the type shown in FIG. 1, the solution having a viscosity of at least 120 falling-ball seconds, as measured at 80.degree. C. or of at least 75 falling-ball seconds, as measured at 100.degree. C., the ring of the annular jet bores consisting of three, preferably equally large, ring segments at a distance from one another of at most 0.2 mm, the surface area of the jet bores of the profile jet amounting to less than 0.2 mm.sup.2 and the side width of the ring segments amounting to at most 0.1 mm, the spinning air acting on the filaments transversely of the direction in which they are taken off relative to the center of the spinning jet.

REFERENCES:
patent: 1934618 (1933-11-01), Briggs et al.
patent: 1944378 (1934-01-01), Thenoz
patent: 2063435 (1936-12-01), Herzog
patent: 2131810 (1938-10-01), Kinsella et al.
patent: 2366275 (1945-01-01), McComb
patent: 3271818 (1966-09-01), Bryan
patent: 3493459 (1970-02-01), McIntosh et al.
patent: 3600491 (1971-08-01), Shimoda et al.
patent: 3737508 (1973-06-01), Weir
patent: 4356134 (1982-10-01), Reinehr et al.

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