This term refers to a specific gate design used in injection molding that is based on a conventional edge gate but includes an additional section of cold runner connected perpendicular to the gate. This additional section serves to reduce the velocity of the polymer melt before it enters the mold cavity. By lowering the initial melt front speed, a more controlled and uniform flow into the cavity can be achieved, helping to prevent molding defects such as jetting. The additional runner section acts as a buffer zone in which the melt flow stabilizes before entering the cavity. For optimal performance, the design of this gate type is often developed using flow simulation to avoid issues such as flow hesitation or excessive melt front velocity.
Injection molding process: Animation of the fill using a tab gate
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