| 摘要 |
PURPOSE: To provide an injection molding method reinforcing the weld line of a molded product only by the simple operation control of injection units without requiring an additional device by using an injection molding machine having two injection units. CONSTITUTION: An injection molding machine equipped with two injection units 10, 20 and a mold 30 having two sprues 33 connected to a cavity 35 through gates 34 at the positions corresponding to the injection units 10, 20 are used and a molten resin is injected from the injection units 10, 20. The injection operation and suck-back operation of the injection units 10, 20 are alternately repeated so as to become mutually reverse operations during the period from the injection of the molten resin to the cooling and solidification thereof. When the molten resin in the cavity 35 is cooled and solidified, the solidified resin is taken out of the mold 30. |
