Process and apparatus for injection molding of plastic materials
AssigneeINGLASS S.p.A.
InventorMaurizio BAZZO
Life of this patent
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Abstract
A method for injection molding of plastic material by means of at least one injector whose pin valve can be displaced between a fully closed position and a maximum controlled fashion according to a position and speed of the pin valve. During displacement of the pin valve from the fully closed position to the maximum open position, and/or vice versa, the pin valve is stopped in intermediate positions and the displacement speed thereof is uniform and constant. An initial opening step at maximum speed and one or more steps of inversion of the motion of the pin valve can be provided for.
Claims25
A method for injection molding of plastic material into a mold cavity by means of at least one injector including a pin valve displaceable between a fully closed position and a maximum open position and vice versa, wherein the pin valve is operated by an actuator in a controlled fashion in connection with a position and speed of the pin valve between said fully closed and maximum open positions, and wherein during displacement from the fully closed position to the maximum open position, the pin valve is stopped in a plurality of partial opening intermediate positions and a displacement speed of the pin valve between said plurality of partial opening intermediate positions is uniform and constant.
A method for controlling an injector of an apparatus for injection molding of plastic materials wherein said injector includes a pin valve displaceable from a fully closing position and a maximum opening position and vice versa, and wherein the pin valve is operated by and actuator in a controlled fashion in connection with a position and speed thereof, the method comprising:
- during a displacement of the pin valve from the fully closing position to the maximum opening position, the pin valve is stopped in a plurality of partial opening intermediate positions,
- during the displacement of the pin valve from the maximum opening position to the fully closing position, the pin valve is stopped in a plurality of partial closing intermediate positions, and
- wherein an opening displacement speed and a closing displacement speed of the pin valve between said plurality of partial opening intermediate positions and said plurality of partial closing intermediate positions are uniform and constant.
Dependencies are inferred from the claim text.