Ejector Pin

Ejector pins are cylindrical rods used in the ejection system of injection molding machines to physically separate solidified plastic parts from mold cavities. They operate through hydraulic or mechanical force applied by the ejector plate assembly, ensuring consistent part release without damage to the mold or product. These components are critical for automated production cycles and require precise alignment with mold ejector holes.

Ejector pins function by transferring linear force from the ejector plate to the molded part. When the injection molding cycle completes and the mold opens, the machine's ejection system activates, pushing the ejector plate forward. This motion drives the pins against the part, overcoming adhesion forces between the plastic and mold surface. The pins retract when the mold closes for the next cycle, maintaining clearance during injection and cooling phases.