| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a flameproof fiber bundle capable of providing a carbon fiber bundle having few structural defects in a single fiber in a method for producing the carbon fiber bundle; and to provide the method for producing the carbon fiber bundle capable of achieving the stabilization of the strength at the production of the carbon fiber bundle, especially the stabilization of the strength at the start of the production. SOLUTION: The method for producing the flameproof fiber bundle by heating a polyacrylonitrile-based fiber bundle having a fiber fineness of 100-30,000 dtex and a number of filaments of 500-70,000 in a heat treating furnace in which an oxidizing gas is circulated in an oxidizing atmosphere at 200-300°C. The method includes: circulating the oxidizing gas through a filtering device which has a filter medium unit having an aggregate in which 97-100% by volume of ceramic particles or metal particles have a particle diameter of 2-80 mm, and packed in the interior thereof, and which is installed in the interior of the heat-treating furnace and/or the circulating duct part of the heat-treating furnace. COPYRIGHT: (C)2011,JPO&INPIT
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