Title:
PRODUCTION OF HIGH-STRENGTH CARBON FIBER
Document Type and Number:
Japanese Patent JPS5530472
Kind Code:
A
Abstract:
PURPOSE: An additional step of heat drawing of acrylonitrile fibers under specific conditions is combined, thus producing efficiently and stably carbon fibers of higher strength.
CONSTITUTION: Acrylonitrile fibers are drawn 1.05W1.5 times at 180W300°C under an inert atmosphere and the molecular chains are highly oriented. Then, the fibers are heat treated at 200W300°C under an oxidative atmosphere with loading a tension so as to prevent the excess disturbance of the molecular chains and cause less than 10% shrinkage. Finally, the fibers are carbonized in a nonoxidative atmosphere to give carbon fibers of high orientation, tensile strength and elasticity.
Inventors:
TAKAKU AKIRA
IMAI YOSHIKATSU
KAWASHIMA MASAO
KANEKO TAKASHI
IMAI YOSHIKATSU
KAWASHIMA MASAO
KANEKO TAKASHI
Application Number:
JP10420578A
Publication Date:
March 04, 1980
Filing Date:
August 25, 1978
Export Citation:
Assignee:
MITSUBISHI RAYON CO
International Classes:
D01F9/22; C01B31/02; (IPC1-7): C01B31/02; D01F9/22