METHOD OF INJECTION MOLDING OF PLASTIC MATERIALS

摘要

A method of injection molding of plastic materials into a cavity of a mold with a molding apparatus including a distributor of the pressurized fluid plastic material connected to at least one injector having a pin valve displaceable between a fully closed position and an open position. The method includes a filling step following displacement of the pin valve from the fully closed position to the open position, a packing step of the pressurized plastic material keeping the pin valve in the open position, and a step of displacement and maintenance of the pin valve in at least one partially closed intermediate position prior to its complete closure.

主权项

1. A method of injection molding of plastic materials into a mold cavity with a molding apparatus comprising a distributor of pressurized fluid plastic material connected to at least one injector comprising a pin valve displaceable between a fully closed position and an open position, the method comprising a filling step of said mold cavity with the pressurized plastic material following displacement of the pin valve from the fully closed position to the open position, a packing step of the pressurized plastic material within the mold cavity while the pin valve is kept in the open position, and then displacement of the pin valve from the open position to the fully closed position, the method comprising an additional step wherein the pin valve is displaced and kept in at least one partially closed intermediate position.