Ejector pins help safely remove plastic parts from molds after they have been injected through a nozzle, by applying a force to eject the part. Pins are in the B-side half of the mold, the side in which the part remains when the mold is opened. Once the mold is opened, the pins extend into the mold cavity, push the part out, and then retract, letting the mold close and be refilled.
