METHOD AND APPARATUS FOR INJECTION MOLDING OF PLASTIC MATERIALS

摘要

A method for injection molding of plastic materials into a cavity of a mold by means of a molding apparatus including at least one injector having a pin valve displaceable between a fully closed position and a maximum opening position, and vice versa, in a controlled fashion in respect of its position and speed. In the opening displacement from the fully closed position to the maximum opening position, the pin valve is initially moved at a first speed and subsequently at a second speed, where the first speed is the highest opening displacement speed of the pin valve.

主权项

1. A method for injection molding of plastic materials into a cavity of a mold by a molding apparatus comprising at least one injector supplied with fluid plastic material under pressure and including a pin valve displaceable between a fully closed position and a maximum opening position, and vice versa, wherein the pin valve is driven by an electrical actuator in a controlled fashion with respect to its position and speed during displacements thereof, wherein the pin valve during opening displacement from the fully closed position to the maximum opening position is initially moved at a first speed and thereafter at at least one second speed, and wherein said first speed is higher than said at least one second speed.