What’s check ring?

Check ring is an important part on the front of screw of injection molding machine. It has important function while the injection machine doing charge and injection.

Please see below picture of check ring.

check ring -1

What’s the function of check ring of injection machine?

check ring function

when the injection molding machine is doing charge, the rotating screw will push the melt material forwarding, the melt material flow to the front of the screw head through the gap between screw head groove and check ring.

when more and more melt material store in front of screw head, it will push back the check ring. when the check ring touch the seal ring,it will prevent the material flowing back.