| 摘要 |
PROBLEM TO BE SOLVED: To produce a carbon yarn which has a high level elastic modulus and a high level compression strength enabling the expression of a high compression strength in a obtained composite material, and to provide a method for stably producing the carbon yarn. SOLUTION: A method for producing carbon yarns, comprising subjecting an acrylic yarn having a single filament elongation variation rate of <=10% as a precursor yarn to a flame-resisting treatment at a temperature of 200 to 300 deg.C in an oxidative atmosphere, subjecting the treated acrylic yarn to a preliminary carbonization treatment at a temperature of 400 to 500 deg.C at a temperature-rising rate of 20 to 100 deg.C/min in an inactive atmosphere, and further, subjecting the treated product to a carbonization treatment at a temperature of 1,800 to 2,000 deg.C in an inactive atmosphere, characterized by treating the acrylic yarn in a drawn ratio of 1.1 to 1.3 in the preliminary carbonization treatment.
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