Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1995-09-01
1997-06-17
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
264 406, 2643288, 26432812, 26432813, 264572, B29C 4576, B29C 4578, B29D 2200
Patent
active
056394055
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 pressured gas is to be introduced on 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 injection molding apparatus to discontinue plastic injection and introduce pressured 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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Elizabeth Erikson Trust
Tentoni Leo B.
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