Process and apparatus for injection molding of plastic materials
AssigneeINGLASS S.p.A.
InventorMaurizio BAZZO
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Abstract
A method and apparatus for injection molding of plastic material into a cavity of a mold by means of at least one injector whose opening and closing occurs through an electronic control unit and wherein an undesired opening of the mold caused by any overpressure of the plastic material injected into the cavity of the mold is detected by means of transducers and corrected by means of the electronic control unit. The transducers are arranged outside the cavity of the mold.
Claims14
A method for the injection molding of plastic material into a cavity of a mold by at least one injector whose opening and closing are operated through an electronic control unit, the method comprising:
- detecting and correcting, by said electronic control unit of said at least one injector, an undesired opening of the mold caused by any overpressure of the plastic material injected into the cavity;
- wherein detection of said undesired opening of the mold occurs through one or more transducer arrangements provided outside the cavity of the mold;
- and
- wherein the detected undesired opening of the mold is corrected by adjusting a stroke and/or a speed and/or a closing/opening acceleration of said at least one injector during injection of the plastic material and/or during a subsequent packing of the injected plastic material.
An apparatus for the injection molding of plastic material into a cavity of a mold formed between a fixed part and a moveable part, including at least one injector whose opening and closing are carried out by an electronic control unit, the apparatus comprising:
- a transducer arrangement suitable to detect an undesired opening of the mold caused by pressure of the plastic material injected into the cavity, said transducer arrangement being operatively connected to said electronic control unit, and said transducer arrangement being positioned outside the cavity of the mold, and
- said electronic control being configured so as to reduce the pressure inside the mold to limit said undesired opening of the mold by adjusting a stroke and/or a speed and/or an opening/closing acceleration of said at least one injector during an injection of the plastic material into the cavity and/or during subsequent packing of the injected plastic material.
Dependencies are inferred from the claim text.