| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently suppress stringing at mold releasing while shortening a molding time. SOLUTION: A shut-off valve 32 is provided at a resin passage 13 from a heating cylinder 10 of an injection molding machine 1 to a mold 2, and a plunger 21 is provided oppositely to the passage 13 of a downstream side from the valve 32. A method for injection molding comprises the steps of filling a resin material in a cavity 5, closing the valve 32, advancing the plunger 21, and starting dwelling from the passage 13 of a downstream side from the valve 32. The method further comprises the steps of closing the valve 32, retracting an injection screw 11, starting a metering step, retracting the plunger 27 at a later time of the metering step while closing the valve 32 as it is, and pressure reducing from the passage 13 of the downstream side to the cavity 5 by the valve 32.
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