With this gate design, the plastic melt is introduced circumferentially or almost circumferentially into a rotationally symmetrical area of the molded part. The resulting ring-shaped melt feed provides a uniform distribution of the flow front and can reduce weld lines, one-sided orientation, and uneven shrinkage. The ring gate is often used for sleeve-, tube-, cup-, or disc-shaped injection molded parts where symmetrical filling and low warpage are important. Its design influences pressure loss, packing pressure transmission, demolding behavior, and subsequent gate separation from the part. Depending on the mold concept, gate removal may be performed mechanically, by break-off, or by means of a designed separation edge.
Injection Molding Process: Simulation of filling through a ring gate
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