Submarine gate injection molding. This guide identifies common defects in injection molding, their causes, and practical solutions to ensure high-quality parts and efficient production. The sub gate is connected to the main runner, which is above the parting line, and it channels the molten plastic directly into the cavity. The tunnel gate (submarine gate) is used very frequently as a type of gate having a structure that automatically cuts the molded item and gate at the time of opening and closing the parting surface. Aug 22, 2023 · A submarine or tunnel gate is a concealed type of injection molding gate located beneath the part’s surface. Understanding the different types of gates and their impact on Mar 29, 2013 · Gate should set on the thickest wall position of molding products, make plastic flow from thick-wall position to thin-wall position to reduce the pressure loss. This is ideal for high-volume automated production. This clever design minimizes visible blemishes on finished products while allowing for efficient filling and packing during the molding process. We present this plastic design guide sub gates, which introduces popular gates and discusses design considerations for injection molding gates. Injection molding is a versatile manufacturing process, but defects can arise due to material properties, tooling design, or process parameters. It is a small secondary gate that is located below the parting line of the mold.