| 摘要 |
PURPOSE:To obtain carbon fibers of an onion structure having a high strength and elasticity stably and easily at a high speed, by melt spinning an optically anisotropic pitch, expanding the flow path of the molten pitch before the extrusion, and controlling the flow behavior of the pitch. CONSTITUTION:An optically anisotropic pitch is melt spun, and flow path 1 of the molten pitch is expanded (>=20 maximum cross-sectional area ratio between flow paths 2 and 1) before the extrusion through an extrusion hole 3, and the resultant fibers are then infusibilized and carbonized or graphitized to give the aimed fibers. If the flow path once expanded is recontracted, the flow of the molten pitch can be made uniform or the flow rate distribution between plural flows can be reduced.
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