| 摘要 |
PURPOSE:To enable formation of a molded body superior in dynamic properties by obtaining raw materials possessing flexibility, by a method wherein a specific number of composite fiber units which are obtained by impregnating and coating a plurality of reinforcing fiber monofilaments with thermoplastic resin and satisfying a specific conditional formula are bundled. CONSTITUTION:A composite fiber unit 1 is constituted by impregnating and coating the inside of thermoplastic resin 2 becoming a matrix with a reinforcing fiber monofilament 3. On this occasion, in the reinforcing fiber monofilament 3, when the stretch modulus is E (kgf/mm<2>), a sectional area is S(mm<2>), a number of the monofilaments in a composite fiber unit 1 is m(-) and the minor axis (that is L2) of a section of the composite fiber unit is 2a(mm) a value to be calculated by E.S.m.a<2> is set up at 50 or lower. The composite fiber units 1 satisfying the conditional formula are bundled 2-1600 pieces, the composite fiber units 1 are melted partly in a longitudinal direction and the composite fiber units adjoining to each other are welded and bundled. |
