PRODUCTION OF CARBON FIBER BUNDLE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a carbon fiber bundle having a light strength without using an expensive device. SOLUTION: This method for producing a carbon fiber bundle comprises sequentially dipping a carbon fiber bundle comprising many carbon filaments in two kinds of different resin liquids. Therein, the contact angle of the resin liquid 4 containing the first resin with the carbon fibers is <=5 degree, and the viscosity of the resin liquid 5 containing the second resin at 20 deg.C is 5-100 poises.