| 摘要 |
PURPOSE:To prevent the separation of primary and secondary molded parts by selecting specific resins not fused or hard to fuse at the mutual contact surface of resins as resins used in two-color injection molding and injecting a secondary resin into a primary resin to deform the same to leave a projection in the secondary molded part. CONSTITUTION:In the primary resin of a first shot in a two-color molding method, either a specific resin A (polyacetal resin, polyamide resin or polypropylene resin) a specific resin B (styrenic resin such as an ABS resin or polycarbonate resin) is used and, as the secondary resin of a second shot, the other one of the specific resins is used. A projection 6a such as a rib 6 left in a secondary molded part 9 deformed at the time of the injection molding of the secondary resin is formed at the proper place of a primary molded part 6. In the case of insert molding or outsert molding, the projection may be provided at the proper place of the resin molded product inserted in a mold. |
