Miller & Prestia
Process for continuous graphitization of graphitizable precursor fibers
 An improved process for manufacturing high-grade and high-quality graphite fibers by the steps of (a) heating carbon fibers from acrylic fibers in an initial heating zone while exposed to an atmosphere of inert gas having a maximum temperature from about 1700.degree. C. to 1900.degree. C., and (b) then heating the resulting fibers in a subsequent heating zone while exposed to an atmosphere of inert gas having a maximum temperature from 2300.degree. C. to 2700.degree. C. 
Toray Industries, Incorporated
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D01F D01F
inventional inventional
Ryuichi Shizuo
Yamamoto Watanabe