| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a carbon fiber bundle having excellent adhesiveness to a matrix resin, and capable of providing stable composite characteristics by reducing uneven treatment in the longitudinal direction of the carbon fiber at an electrolytic surface treatment step. SOLUTION: The method for producing the carbon fiber bundle involving treating the surface of a carbon fiber by using the electrolytic surface-treating apparatus for allowing the polyacrylonitrile-based carbon fiber bundle to travel in a single vessel or a plurality of vessels filled with electrolyte, has an average temperature of the electrolyte in the vessel of≥5°C and≤60°C, and a difference in maximum temperature and minimum temperature of the electrolyte in the vessel of≤5°C. COPYRIGHT: (C)2007,JPO&INPIT
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