Operating method for injection molding machines comprises rotating plasticizer screw in opposite sense to transport direction during injection phase

摘要

Operating method for injection molding machines comprises rotating the plasticizer screw (23) in the opposite sense to the transport direction during the injection phase. An independent claim is included for a control unit for use in the method which rotates the screw in the opposite sense to the transport direction during the injection phase. The position of the screw at the end of the back pressure phase is such that a free screw channel (25) is positioned under the hopper (28).