INJECTION MOLDING METHOD, INJECTION MOLD, INJECTION MOLDING APPARATUS AND INJECTION MOLDED PRODUCT

摘要

PURPOSE:To produce a molded product having fine meshes in good yield by inserting a projection in an insertion hole to separate a fixed mold and a movable mold by the thickness of the molded product to clamp both molds and injecting a molten resin into the gap between the fixed and movable molds. CONSTITUTION:The frame part 11 and mesh part 12 of a filter 1 are integrally molded from a resin using an injection molding apparatus 2. A projection 60 and the insertion hole 61 in which the outer peripheral surface of the projection can be fitted without generating a gap are respectively provided to the mating surfaces of the movable mold 49 and fixed mold 28 of the injection molding apparatus 2. At the time of molding, the outer peripheral surface of the projection 60 is fitted in the insertion hole 61 without generating a gap and the groove for the frame part 11 and the grooves 59 for the mesh part 12 are provided between the molds 28,49 to clamp both molds. A resin is injected into the grooves to mold the filter 1 as a molded product. At this time, the gas accumulated in the molds is discharged to the outside from a gas vent 32. By this constitution, cost reduction becomes possible.