Method of producing precursor fiber for carbon fiber and carbon fiber

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United States of America

PATENT NO 11932971
SERIAL NO

17287510

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Abstract

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A method of producing a precursor fiber for carbon fiber includes extruding a polyacrylonitrile copolymer solution from a spinneret into the air, immersing it in a coagulation bath liquid stored in a coagulation bath, redirecting traveling of the coagulating fiber bundle by a first guide immersed in the coagulation bath disposed below the spinneret, and pulling it out of the coagulation bath liquid into the air to prepare a coagulated fiber bundle, which is then subjected to at least a washing step in water, stretching step, oil agent applying step, and drying step, wherein the depth-directional coagulation bath immersion length, which means a distance between the starting point of the immersion of the spinning dope solution in the coagulation bath liquid and the first guide immersed in the coagulation bath where traveling of the coagulating fiber bundle is redirected, is 3 to 40 cm.

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Patent Owner(s)

  • TORAY INDUSTRIES INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Horinouchi, Ayanobu Otsu, JP 6 2
Okishima, Yuuki Ehime, JP 4 33
Watanabe, Fumitaka Otsu, JP 12 35

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