Patent ID: 8883060

Claim:
A method for producing an FRP cylinder, wherein a plurality of rectangular prepregs formed by impregnating reinforced fibers with thermosetting resin sheets are wound into a cylinder and thermally cured to be formed as a plurality of FRP layers, said method comprising: a simultaneous multilayer winding process in which a torsional rigidity retaining prepreg and a buckling prevention prepreg are continuously wound by a plurality of turns while being layered on each other when said plurality of prepregs are wound into an FRP cylinder having a constant diameter along a cylindrical axis direction of said FRP cylinder, wherein said torsional rigidity retaining prepreg includes a layer of fibers oblique to said cylindrical axis direction, wherein said buckling prevention prepreg includes a layer of fibers orthogonal to said cylindrical axis direction, and wherein said simultaneous multilayer winding process is performed at least two times alternately in mutually opposed winding directions.