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AssigneeAutomotive Plastic Technology, Inc.
InventorsWilliam A. Nelson, Joseph Shemanski
Estimating the term…
A method and apparatus for gas assisted injection molding which will first inject a shot of molten plastic into a suitable mold, shut off the plastic flow into the mold, and either immediately, or after a delayed time, inject a suitable pressurized gas into the mold at a desired injection pressure. The pressure of the gas in the mold is then controlled by stepping up or stepping down the pressure in the mold in a series of steps to arrive at a second predetermined and precisely controlled pressure. The predetermined pressure is held for a desired time. The setting and holding of pressure is repeated as many times as desired, and is then stepped down to a final pressure. The mold is then opened, and the article is removed.
An apparatus for introducing an injection gas into the interior of a mold cavity, said apparatus including, in combination:
A gas pressure control apparatus for controlling the pressure of an injection gas during injection into a mold cavity, said apparatus including in combination
A gas assisted injection molding system, said system including, in combination:
Dependencies are inferred from the claim text.