| 摘要 |
PROBLEM TO BE SOLVED: To obtain an FRP tube of excellent quality by rationalizing the relation between the size of a preform and that of a cavity in an internal pressure molding method. SOLUTION: A tubular preform 4 obtained by covering a flexible tube 1 at least with reinforcing fibers is introduced into the cavity 6 of a mold and pressed to the wall surface of the cavity 6 by pressurizing the interior of the flexible tube 1 to mold an FRP tube. In this case, the relation between the outer periphery length (Cp) of the preform before pressurization and the inner periphery length (Cc) of the cavity is set to Cp>0.6Cc. |
