Process 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.
Claims8
A method for the injection molding of plastic material into a cavity of a mold by a plurality of autonomously controlled injectors each having a pin valve 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;
- wherein the detected undesired opening of the mold is corrected by adjusting a speed and/or a closing/opening acceleration of one or more of said pin valves during injection of the plastic material and/or during a subsequent packing of the injected plastic material;
- and
- wherein a maximum opening value of the mold is established, and upon reaching which the opening of one or more of said pin valves during their opening stroke is interrupted.
Dependencies are inferred from the claim text.