PRECURSOR FIBER BUNDLE FOR MANUFACTURE OF CARBON FIBER, MANUFACTURING APPARATUS AND METHOD OF MANUFACTURING CARBON FIBER BUNDLE

摘要

A series of precursor fiber bundles for manufacture of carbon fiber that comprise a plurality of precursor fiber bundles for manufacture of carbon fiber, which have 30,000 or more filaments and which are joined to one another at terminal ends and starting ends directly or through intervening fiber bundles (for example, flameproof fiber bundles) having a non-heating property at a flameproof treatment temperature. At the joining portions, filaments of the respective fiber bundles interlace at a filament level with one another. Interlacing at the filament level is performed by subjecting overlapping portions of terminal ends and starting ends of flatly opened fiber bundles to filament interlacing treatment with a jetting fluid or a needle punch. The series of precursor fiber bundles for manufacture of carbon fiber involve less heat accumulation at the joining portions during flameproof treatment although they are thick.