METHOD FOR PRODUCING CARBON FIBER AND CARBON FIBER BOBBIN

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a carbon fiber having excellent dispersibility and essentially free from a sizing agent in high production stability without lowering the quality and grade and provide a carbon fiber bobbin suitable for the use in higher-order processing. SOLUTION: A carbon fiber is wound in the form of a bobbin by winding the carbon fiber wet with water in the form of the bobbin and drying the wound fiber as it is. The water content of the carbon fiber is 5-50% in the winding stage and is decreased to <=0.4% by drying.