Proving the Advantages of a Servo-Driven Valve Gate System



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One innovation for improving sequential injection molding centers around the use of servomotor technology.New servo-driven valve gate systems incorporate a toggle-type mechanism that operates the valve pin position at 90 degrees from the servomotor stroke. A connecting rod between the servomotor and the toggle mechanism (which can be of any length) makes it possible to move the servomotor to what is determined to be an optimal position, including outboard and on the side of the mold. This design enables a much more powerful servomotor to be used to operate the valve gate open/close actuation. A specially designed control system accurately programs the valve pin in eight distinct positions with varying velocity and force in both the opening and closing phases of operation. This provides optimized plastic flow control from each valve gate nozzle into the mold.