Process for the production of dry-spun hollow...

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

D - Textiles, Paper

01

D

18/612

D01D 5/24 (2006.01) D01F 6/18 (2006.01)

Patent

CA 1168009

ABSTRACT A process for the production of dry-spun hollow poly- acrylonitrile fibres and filaments Hollow polyacrylonitrile fibres 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°C or of at least 75 falling-ball seconds, as measured at 100°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 mm2 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 centre of the spinning jet.

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