Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1997-01-17
2000-02-01
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
264 401, 264572, B29C 4500
Patent
active
060199180
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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