摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a weld line, in injection molding using a thermoplastic resin containing 'scaly' metal fine particles, by arranging metal fine particles on the design surface of a resin molded product substantially in parallel to the design surface. SOLUTION: A mold 7 used in the injection molding of a resin molded product having a design surface from a thermoplastic resin containing almost disc- shaped metal fine particles is constituted as follows. That is, V-grooves 153 having a V-shape cross section are closely provided to the inner surface 71a of the mold molding the design surface of a resin molded product in a concentric circular or spiral state from the gate corresponding part 75 on the inner surface 71a positioned in the vicinity of a molten resin introducing gate 73 toward the peripheral edge part of the mold. By using this mold, in an injection molded product, the almost disc-shaped metal fine particles contained in the thermoplastic resin are arranged substantially in parallel to the design surface of the molded product. As a result, the generation of a weld line can be prevented. |