Method for producing carbon fibers from acrylonitrile fiber strands
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United States of America Patent
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Sep 26, 1989
Grant Date -
N/A
app pub date -
Aug 7, 1987
filing date -
Aug 7, 1986
priority date (Note) -
Expired
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Abstract
A method for manufacturing carbon fiber strand from an acrylic polymer by steps of (a) wet spinning, (b) washing with water to obtain gelled fiber strand and (c) drying, wherein during the drying step the gelled fiber strand is shrunk by about 5 to 15% when the water of the gelled fiber strand is within a range of from about 100 to 20% by weight based on the weight of the dry fiber strand. An acrylic fiber strand without coalescence or entangling of filaments can consistently be obtained, from which carbon fibers with high quality and substantially no coalescence can be produced.
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