Flow front control system for a gas assisted plastic injection m

Details Flow front control system for a gas assisted plastic injection m Flow front control system for a gas assisted plastic injection m

1996-06-06

1998-01-13

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

264572, 425145, B29C 4577

Patent

active

057076596

ABSTRACT:
A control system for a gas assisted injection molding apparatus which provides precise and reproducible indication of when the injection of plastic is to terminate and when the pressurized gas is to be introduced on the basis of sensing of the location of the flow front of the injected plastic in the mold cavity. The flow front sensor control system according to the present invention includes: one or more sensors located at one or more predetermined locations of the cavity of a mold of a gas assisted injection molding apparatus, a controller which processes sensed data from the one or more sensors and thereupon sends a signal to the gas assisted plastic inaction molding apparatus to discontinue plastic inaction and introduce pressurized gas. The preferred type of sensor is a temperature sensor; however, other types of sensors, such as a pressure sensor, may be used.

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