Method of producing mesophase pitch type carbon fibers and nozzl

Details Method of producing mesophase pitch type carbon fibers and nozzl Method of producing mesophase pitch type carbon fibers and nozzl

1989-11-17

1991-08-06

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Filaments

26421111, D01F 912

Patent

active

050375890

ABSTRACT:
In a method of producing mesophase pitch based carbon fibers, including the steps of melt-spinning a mesophase pitch through a nozzle (1) having at least one pair of a counter-bore (2) and a circular capillary (3) to form a pitch fiber and subjecting the pitch fiber to an infusible treatment, a carbonization treatment, and if necessary, a graphitization treatment, to form a carbon fiber, the nozzle has a degree of asymmetry .phi. of from 0.1 to 0.9, .phi. being defined by the following equation .phi.=S.sub.A /S.sub.B, wherein S.sub.A is an area of an inscribed circle in a contour of the cross-section of the counter-bore, which circles is perpendicular to the nozzle axis and has a center on the axis of the capillary and inscribed and S.sub.B is a total area of the cross-section of the counter-bore.

REFERENCES:
patent: 1788660 (1931-01-01), Colomb
patent: 4318612 (1989-04-01), Hara et al.
patent: 4376747 (1983-03-01), Nazem
patent: 4717331 (1988-01-01), Maeda et al.
patent: 4816202 (1989-03-01), Itoi

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