| 摘要 |
<p>A carbon fiber precursor fiber bundle comprising acrylonitrile-based single fibers, characterized in that the fiber cross section of the single fiber has a ratio of a long diameter to a short diameter (long diameter/short diameter) of 1.05 to 1.6 and the amount of Si ranges 500 to 4000 ppm as measured by the IPC emission analysis; a carbon fiber precursor fiber bundle comprising acrylonitrile-based single fibers, characterized in that the fiber bundle has a liquid content (HW) of 40 wt % or more and less than 60 wt %. The former fiber bundle has high capability of being collected and thus is good in the capability of being passed through a burning step and yields a carbon fiber bundle which has good capability of being impregnated with a resin, good opening characteristics, high strength and high bulkiness; and the latter bundle yields a carbon fiber bundle which is further improved in bulkiness and excellent in the capability of being impregnated with a resin, in opening characteristics and in covering properties when being woven into a cloth.</p> |
