Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Reexamination Certificate
2005-02-15
2005-02-15
McDowell, Suzanne E. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
C264S572000
Reexamination Certificate
active
06855280
ABSTRACT:
A system and process for gas-assisted injection molding of plastic materials using gas holding pressure in the mold cavity. An infinitely controlled gas pressure valve is utilized to provide initial pressure in a sealed mold and the gas is vented to a prespecified pressure when plastic is injected into the mold cavity. Additional gas is injected into the plastic material from a gas pin assembly in order to force the plastic to completely fill the mold cavity and to provide a hollow cavity in the completed part. Once the injection molding process has been completed and the part has cooled and solidified, the mold is opened, and the completed plastic molded component or part is removed or ejected.
REFERENCES:
patent: 5558824 (1996-09-01), Shah et al.
patent: 6019918 (2000-02-01), Guergov
Lear Corporation
McDowell Suzanne E.
Panagos Bill
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