DME University

Plastic Injection Molding Vent Definition

Vent Definition

As the mold cavity is being filled with plastic, air can be trapped and must be displaced. This displacement is accomplished through vents along the parting line or through ejection pins. If the air is not vented the compression of the trapped air will create enough heat to burn the plastic. The animation here shows venting of air and gases from the cavity at a spot opposite the gate.


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