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.
Claims6
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 having a pin valve whose opening and closing are carried out by an electronic control unit, the apparatus comprising:
- a transducer arrangement configured 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,
- said electronic control unit being configured so as to reduce pressure inside the mold to limit said undesired opening of the mold by adjusting a speed and/or an opening/closing acceleration of said pin valve of said at least one injector during injection of the plastic material into the cavity and/or during subsequent packing of injected plastic material, and
- wherein a maximum opening value of the mold is established, and upon reaching which an opening of said pin valve of said at least one injector during its opening stroke is interrupted by said electronic control unit.
Dependencies are inferred from the claim text.