Fiber-reinforced resin hollow molded body and method for producing same

A method for manufacturing a fiber reinforced resin hollow molded body,

• wherein, in the manufacturing of the fiber reinforced resin hollow molded body, a resin-integrated fiber sheet is used,
• the resin-integrated fiber sheet comprises:
• a fiber sheet comprising unidirectional continuous fibers that are spread fibers of a continuous fiber group and arrayed unidirectionally in parallel;
• and
• thermoplastic resin that is present at least on part of a surface of the fiber sheet comprising the unidirectional continuous fibers, and
• the resin-integrated fiber sheet is a semipreg in which the thermoplastic resin in a powder form that serves as a matrix of the fiber reinforced resin hollow molded body adheres to the surface of the fiber sheet comprising the unidirectional continuous fibers through thermal fusion,
• the method comprising:
• winding a stack of a plurality of the resin-integrated fiber sheets around a surface of an elastic body to produce a wound body having an overlapping portion, the stack including the resin-integrated fiber sheet being oriented with its unidirectional continuous fibers at 0° with respect to a length direction of the elastic body;
• placing the elastic body wound with the stack of the plurality of the resin-integrated fiber sheets in a heated mold having a hollow shape;
• and
• performing pressure molding by supplying pressure fluid into the elastic body and melting the thermoplastic resin to impregnate the thermoplastic resin in the entire fiber sheets comprising the unidirectional continuous fibers in order to consolidate the wound resin-integrated fiber sheets.