Gas-assisted injection molding process for producing hollow molded article
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United States of America Patent
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Jan 11, 1994
Grant Date -
N/A
app pub date -
Feb 7, 1992
filing date -
Feb 8, 1991
priority date (Note) -
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Abstract
A hollow molded article is produced by supplying a molten resin between a pair of a fixed mold and a movable mold before the fixed mold and the movable mold are closed, inserting at least one gas-supplying pin which is provided on a surface of the fixed mold to form a hollow part in a part of the resin and supplying pressurized gas through said gas-supplying pin before the mold closing is finished, closing the movable mold to fill the resin in a cavity formed by the molds, slightly opening the molds while pressurizing a gas in the resin to expand the hollow part and opening the movable mold to remove a hollow molded article from the molds.
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