| 摘要 |
<p>This invention relates to injection molding and particularly to a melt transfer system for stack molding. According to the invention, a novel combination of known melt flow control valve units are arranged and operated to control the flow of pressurized melt from the stationary platen adjacent the molding machine to a manifold in the center moving platen. One control valve unit is located in the stationary platen in alignment with another control valve unit located in the moving platen. When the moving platen is in the closed position adjacent the stationary platen, the gates of the two control valve units abut and when the valve pins of the two control valve units are actuated to the open position, pressurized melt will flow through the gates from the stationary platen to the moving platen. The hot runner passage extends from the molding maching through the control valve unit located in the stationary platen. Through the gates into the control valve unit located in the moving platen, and then through the manifold system to the cavities located on opposing faces of the moving platen. In a second embodiment, a first cavity is located between the above two gates, and a third control valve unit is located in the moving platen in abutting alignment with the second control valve unit and its gate extends to a second cavity of the opposite face of the moving platen.</p> |
