Patent ID: 6485592
Filing Date: 2002-11-26
Classification: B65H,D01F

Abstract:
A precursor fiber bundle for manufacture of carbon fibers, comprising a first precursor fiber bundle for manufacture of carbon fibers, said first precursor fiber bundle having 30,000 or more filaments and having a flatly opened undivided terminal end wherein said terminal end is the only portion of said first precursor fiber bundle flatly opened, a second precursor fiber bundle for manufacture of carbon fibers, said second precursor fiber bundle having 30,000 or more filaments and having a flatly opened undivided starting end wherein said starting end is the only portion of said second precursor fiber bundle flatly opened, an intervening fiber bundle comprising many filaments having a non-exothermic property at stabilizing treatment temperature, said intervening fiber bundle having a flatly opened undivided starting end and a flatly opened undivided terminal end wherein the terminal end of said first precursor fiber bundle and the starting end of said second precursor fiber bundle are joined through said intervening fiber bundle; and at a first joined portion where the terminal end of said first precursor fiber bundle and the starting end of said intervening fiber bundle are joined and at a second joined portion where the starting end of said second precursor fiber bundle and the terminal end of said intervening fiber bundle are joined, the individual filaments of said undivided ends of said respective fiber bundles are substantially uniformly interlaced with each other, wherein said interlacing of filaments is in a pattern selected from the group consisting of continuous substantially uniform interlacing in the transverse direction of said fiber bundles, interlacing at many joints on the joining portion, and interlacing of the entire face of said joining portion.