| 摘要 |
Provided are a method for producing a composite molded body, and a composite molded body by the method, wherein: (1) at least one of preforms (a) and (b) which are made of fiber-reinforced thermoplastic resins contains reinforcing fibers having a weight average fiber length of 1 mm or more; (2) a thermoplastic resin (A) is used for the preform (a) and the thermoplastic resin (A) or a thermoplastic resin (B) is used for the preform (b); (3) a thin film of a thermoplastic resin (C) is formed on the surface of either the preform (a) or (b), or on the surfaces of both of the preforms (a) and (b); and (4) the resin (C) and a part of the preforms (a) and (b) are molten by heating while the resin (C) is placed at the boundary surface of the joint, to join the preforms (a) and (b). By setting the crystallization speed of the thermoplastic resin (C) to be relatively slow so that the resin (C) contacts the surfaces of the preforms (a) and (b) at a molten condition for a longer period, a high-strength joint between the preforms (a) and (b) can be achieved. |
