Process for producing chopped strand of carbon fiber

Details Process for producing chopped strand of carbon fiber Process for producing chopped strand of carbon fiber

1990-03-15

1991-07-09

Kunemund, Robert

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234471, 4234472, 4234476, 264 292, D01F 912

Patent

active

050304356

ABSTRACT:
The present invention relates to a process for producing a carbon fiber chopped strand which comprises preparing a pitch fiber from petroleum pitch or coal pitch, cutting the pitch fiber to a predetermined desired length, heating the cut pitch fiber at a high density accumulation in the atmosphere of an oxidative gas to infusibilize the cut pitch fiber, and then carbonizing and graphitizing the infusibilized fiber in an inert atmosphere. According to the process of the invention, no fuzz are formed on the fiber and no uneven infusibilization takes place. Further, the pitch fiber chopped strand accumulation has a high bulk density and relieve exothermic excursion naturally, and therefore neither combustion nor sticking takes place even in an oxidative atmosphere. Accordingly, the production speed can be enhanced and the cost can be lowered to a great extent.

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