Apparatus for gas assisted injection molding having precise cont

Details Apparatus for gas assisted injection molding having precise cont Apparatus for gas assisted injection molding having precise cont

1991-11-27

1994-03-22

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264572, 425146, 425149, 425872, B29C 4577

Patent

active

052958000

ABSTRACT:
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.

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Webster's Ninth New Collegiate Dictionary, 1986, p. 767.

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