Process to prevent crack formation in the production of carbon f

Details Process to prevent crack formation in the production of carbon f Process to prevent crack formation in the production of carbon f

1986-01-13

1989-04-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Filaments

264 296, 264 83, 2641761, 26421111, 26421114, 26421115, 425467, D01F 912

Patent

active

048184497

ABSTRACT:
When preparing carbon fibers from mesophase pitches, we usually encounter to the formation of cracks along the fiber axis. The crack formation is the most serious and troublesome problem. A simple process which can effectively prevent the crack formation comprises preparing the carbon fibers from mesophase pitches by melt spinning sufficient only to give a rotatory motion to the molten mesophase pitches just before extrusion substantially around the axis of a spinning nozzle hole. The process employs a usual nozzle plate having a pitch introducing tube and a spinning nozzle hole further containing a plug member having an outer spiral groove such as a drill point or a worm gear which is inserted within the pitch introducing tube.

REFERENCES:
patent: 4076481 (1978-02-01), Sansome
patent: 4331620 (1982-05-01), Diefendorf et al.
patent: 4376747 (1983-03-01), Nozen
patent: 4504454 (1985-03-01), Rijgs
patent: 4576811 (1986-03-01), Rijgs et al.

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