Gas assisted injection molding with controlled internal melt pressure
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United States of America Patent
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Feb 1, 2000
Grant Date -
N/A
app pub date -
Jan 17, 1997
filing date -
Jan 17, 1997
priority date (Note) -
Expired
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Abstract
A method is provided for gas-assisted injection molding for forming a hollow product. The mold cavity is prepressurized with fluid prior to injecting the molten material into the mold cavity, and the molten material is injected into the mold cavity against the pressurized fluid to establish a resultant internal counterpressure within the molten material. A pressurized assist-gas is injected into the molten material to form a gas bubble within the molten material. The injection of molten material into the cavity is then controlled in a manner to maintain the internal counterpressure at desired levels to overcome stress forces and to control formation and movement of the bubble within the melt.
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