| 摘要 |
PROBLEM TO BE SOLVED: To facilitate removing core, in molding a resin molding using a mandrel. SOLUTION: In the mandrel 1 wherein a sheet like resin material 10 to be subjected to a heat curing treatment is wound and mounted on the outer periphery of the mandrel to be subjected to the heat curing treatment, and the cured tubular resin molding 11 is removed, at least the outer peripheral part 2a of the mandrel for mounting is consisted of a metal material having a linear expansion coefficient of 15×10<SP>-6</SP>/K or more. Aluminum or an aluminum alloy is suitable as the metal material. The sheet like resin material is enlarged in diameter as the mandrel is heated and expanded, and is heated and cured as it is to be a resin molding. The mandrel returns to its original size when the heating is completed to form a small space between the mandrel and the resin molding, facilitating the removal of the resin molding from the core. COPYRIGHT: (C)2006,JPO&NCIPI |
