METHOD FOR MANUFACTURING FLAMEPROOF FIBER BUNDLE, METHOD FOR MANUFACTURING CARBON FIBER BUNDLE AND JOINING APPARATUS

To provide a manufacturing method capable of producing, with high productivity, a carbon fiber bundle manufactured by connecting an upstream precursor fiber bundle and a downstream precursor fiber bundle via a connecting fiber bundle.SOLUTION: There is provided a method for manufacturing a flameproof fiber bundle, the method for manufacturing a flameproof fiber bundle comprises: a step of joining an upstream precursor fiber bundle A1 and a downstream precursor fiber bundle via a joining fiber bundle B; and a step of flameproofing the joined precursor fiber bundle by feeding the joined precursor fiber bundles through a flameproofing furnace, in which in the joining step, an oil solution is applied to a joint area of a joining target precursor fiber bundle so as to control a quantity of the oil solution adhering to the joint area in the joining target precursor fiber bundle into 0.15 to 0.85 wt% before joining the joining target precursor fiber bundle and the joining fiber bundle.SELECTED DRAWING: Figure 1 【課題】接続繊維束を介して上流側前駆体繊維束と下流側前駆体繊維束とを接続して製造される炭素繊維束を高い生産性で生産できる製造方法を提供する。【解決手段】耐炎化繊維束の製造方法は、接続繊維束Ｂを介して上流側前駆体繊維束Ａ１と下流側前駆体繊維束とを接続する接続工程と、接続した前駆体繊維束を耐炎化炉を走行させて耐炎化する耐炎化工程とを含む耐炎化繊維束の製造方法であって、接続工程では、接続対象の前駆体繊維束と接続繊維束とを接続する前に、接続対象の前駆体繊維束における接続領域の油剤付着量が０．１５〜０．８５ｗｔ％となるように、油剤を付与する。【選択図】図１