| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a sink in an injection molded product on the surface side thereof by the rib present on the rear surface side of the injection molded product. SOLUTION: In a mold for the injection molding of a molded product 14 having a first flat surface 14a, the second flat surface 14b positioned on the rear side of the first flat surface 14a and the frame-shaped rib 14e vertically projected from the second flat surface 14b, the mold 16 for molding the second surface 14b has the cavity opened to the molding surface 17 for molding the second surface 14b in a frame shape and corresponding to the rib 14e to mold the same and the compressed air supply passage 20 opened to the central part of the molding surface 17 surrounded by the cavity to supply compressed air toward the molding surface 17 and compressed air is supplied toward the cavity from the central part of the molding surface 17 surrounded by the cavity and the resin injected into the cavity is pressed to the outer peripheral side of the cavity. |
