Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1982-02-04
1983-12-20
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642107, 2642108, 526341, 528502, D01F 700
Patent
active
044217080
ABSTRACT:
High-strength filaments of dry-spun polyacrylonitrile 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 stretching medium gradually increasing from stage to stage up to .theta.=.theta..sub.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 .theta..sub.n, after which the material is further treated in the conventional way, optionally with fixing of the stretched material to a pre-determined extent.
REFERENCES:
patent: 3925524 (1975-12-01), Kommel et al.
patent: 4079122 (1978-03-01), McLoughlin et al.
patent: 4271056 (1981-06-01), Coleman et al.
patent: 4285831 (1981-08-01), Yoshida et al.
patent: 4301107 (1981-11-01), Kreahling et al.
patent: 4303607 (1981-12-01), De Maria et al.
Gartner Eckhard
Nogaj Alfred
Pieper Christian
Reichardt Manfred
Sandhu Surinder S.
Bayer Aktiengesellschaft
Woo Jay H.
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