Process to prevent crack formation in the production of carbon fibers
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United States of America Patent
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Apr 4, 1989
Grant Date -
N/A
app pub date -
Jan 13, 1986
filing date -
Jan 19, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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