| 摘要 |
A plasticizing process in which a molten resin that has been plasticized and dissolved in a foaming gas is sent to the front end side of a heating cylinder 20 by means of a screw 21 that rotates in a heating cylinder 20, and the screw 21 retreats according as the molten resin accumulates in the front end side of the heating cylinder 20; a transfer process in which the screw 21 is advanced with rotating and transfers the molten resin accumulated in the front end side of the heating cylinder 20 from a plasticizing unit 2 to an injection unit 3, and an injection process in which the molten resin is injected from the injection unit 3 are conducted and repeated to produce a foamable injection molded product. By this method, in injection molding of a foamable injection molded product dissolved in a foaming gas such as an inert gas, plasticization of a raw material resin and impregnation of a plasticized molten resin with a foaming gas in a molding cycle can be improved, whereby productivity can be improved. |
