DME University

What Are Gates In Plastic Injection Molding?

A gate is the connection between the runner system and the molded part. It must permit enough flow to fill the mold cavity, plus additional material to allow for part shrinkage and cooling.

The gate is the most critical part of the runner system. The gate type, location, and size has a great effect on the molding process. It affects physical properties, appearance, and size of the part. On the next pages you’ll learn more about the gate types and applications.



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