| 摘要 |
PURPOSE: To provide the injection molding method for a molding having excellent external appearance quality and a surely desired hollow structure in stable molding cycle without being influenced by resin to be used CONSTITUTION: The injection molding method comprises a process, in which a plug body 20 is at the forward end position of a cavity 16 with a plug body shifting means 22 before the start of the injection of molten resin, a process, in which the plug body 20 is shifted to the backward end position in the direction nearly parallel to the flow axis line direction of the molten resin with the plug body shifting means 22 after the start of the injection of the molten resin, a process, in which pressurizing fluid is poured in the molten resin in the cavity 16 during the shifting of the plug body, and further a process, in which the resin is cooled and solidified in the cavity 16 after the plug body 20 is shifted to the forward end position in the direction nearly parallel to the flow axis line direction of the molten resin so as to produce a hollow structure within the resin. |
