Process for the production of high-strength filaments from...

Details Process for the production of high-strength filaments from... Process for the production of high-strength filaments from...

D - Textiles, Paper

01

D

18/612

D01D 5/04 (2006.01) D01F 6/18 (2006.01)

Patent

CA 1199763

ABSTRACT "Process for the production of high-strength filaments from dry-spun polyacrylonitrile" High-strength filaments of dry-spun polyacrylo- nitrile are obtained by a process in which tension-reduced spun filaments are continuously stretched hydrothermally in one or more stages: where it involves several stages, stretching is carried out at a temperature of the stretch- ing medium gradually increasing from stage to stage up to ?=?n and, in the final (n-th) stage, to a degree of at least 50% of the maximum degree of stretching; where it is carried out in a single stage, stretching is carried out at the optimal stretching temperature ?n, after which the material is further treated in the conventional way, optionally with fixing of the stretched material to a pre-determined extent.

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