Mold apparatus and injection molding method for producing hollow-structured article by injection molding
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United States of America Patent
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Aug 12, 1997
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N/A
app pub date -
Aug 2, 1995
filing date -
Aug 12, 1994
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Abstract
An injection-molding method using an injection molding machine having a mold apparatus comprising (A) a fixed mold member, (B) a movable mold member movable in the mold opening and closing directions, (C) an intermediate mold member which is provided between the fixed mold member and the movable mold member and is slidable in the mold opening and closing directions between the fixed mold member and the movable mold member, and (D) at least one intermediate mold member sliding means for sliding the intermediate mold member in the mold opening and closing directions, the method including the steps of injecting a molten resin into a cavity formed of cavity wall surfaces of the fixed mold member, the intermediate mold member and the movable mold member, and increasing the distance of the cavity by moving the movable mold member in the mold opening direction with keeping the intermediate mold member in intimate contact with the fixed mold member or the movable mold member by the intermediate mold member sliding means, and introducing a pressurized fluid into the molten resin in the cavity, thereby to form a hollow structure in the resin.
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