D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
18/9
D01F 9/22 (2006.01) D01F 6/18 (2006.01)
Patent
CA 1312713
ABSTRACT OF THE DISCLOSURE A carbon fiber strand comprising a plurality of carbon filaments of high strength is disclosed, each filament of which is substantially circular in its cross-section but which has a circumferential ruggedness which extends in parallel to an axis of the filament to form pleats. The ruggedness has a depth of more than 0.1 µm. The carbon fiber strand is prepared by extruding a spinning solution of an aqueous polyacrylonitrile/pure zinc chloride solution of a specified polymer content from a plurality of nozzles into a coagulating bath at a specified draft ratio, followed by washing, drying and stretching at a total stretching ratio of 10 - 20 to form a precursor which is then subjected to conventional stabilizing and carbonizing steps.
493078
Imai Koichi
Miyahara Naomasa
Ohsaki Takashi
Marks & Clerk
Nikkiso Co. Ltd.
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