METHOD OF INJECTION MOULDING

专利名称：METHOD OF INJECTION MOULDING发明人：INDRA R. BAXI申请号：AU2473188申请日：19881104公开号：AU616913B2公开日：19911114

摘要：A process for producing an injection molded product includes introducing astream of plastic material into a mold space at a first pressure. A quantity of gas is storedin a storage chamber at a second pressure which is at least as high as the first pressure.The gas is introduced into the molten stream of plastic material immediately after themolten material has passed the position at which the gas is introduced thereby forming agas cavity in the molten material. The gas exerts pressure on the surrounding plasticmaterial to urge the material toward the surfaces of the mold space. As the feeding ofthe plastic material into the mold space continues, the injection of the gas is alsocontinued. The supply of molten material is terminated when the surfaces of the moldspace are completely covered by the molten material. A pressure is held within the gascavity as the plastic material cools. Subsequently, the pressure is released to bring thegas cavity to ambient pressure. Then the mold is opened to remove the hollow shapedarticle. An apparatus for producing an injection molded product is also disclosed.

申请人：JAMES W. HENDRY

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