PREPARATION OF FRP HOLLOW RECTANGULAR MATERIAL

摘要

PURPOSE:To make it possible to easily demold a metal core, by using the metal core to be used in a state divided into three or more plate-shaped ones so as to shorten the short side thereof. CONSTITUTION:In order to easily remove a metal core from a FRP molded body, the metal core is divided into plate-shaped ones and the divided metal core contacted with other divided ones is pulled off and removed at first after the molding of FRP without contacting the long side part thereof with the FRP molded body. The metal core is divided into three of more plate-shaped ones in order to secure the metal core of which the long side part is not contacted with FRP. The thickness of each of three or more plate-shaped metal cores, that is, the length of the short side thereof is arbitrary. In order to further facilitate the pulling-off of the metal core, the plate-shaped metal core pulled off and removed at first is divided so as to have an angle of inclination of 0.1 deg. or more in the longitudinal direction thereof because the effect on the lowering in pulling-off force is low even if the metal core is divided at an angle of inclination of below 0.1 deg..