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.
Claims14
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 of the pin valve from the fully closed position to the maximum open position, the displacement of the pin valve provides for at least one step of inversion of motion thereof and the pin valve is stopped in a plurality of partial intermediate positions, and wherein the position of the pin valve is directly or indirectly detected via a sensor associated with the pin valve.
Dependencies are inferred from the claim text.