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Runner Design Injection Molding System Design The gate is the connecting part between the runner and the cavity, and is also the end part of the injection predeformation mold gating system, the molten plastic enters the cavity and core side through the gate directly. The function of the gate is make the molten plastic coming from the runner enter and fill the cavity with core by fast speed, after the cavity with core are filled with plastic, the gate can be cooled quickly and sealed to prevent the hot material in the cavity from flowing material.