The structural form of the injection mold and the processing quality of the mold directly affect the quality and production efficiency of the plastic parts. Sometimes there might have such problems, for example, the injection molded part cannot drop off freely. The part is stuck on the gate.

During the injection molding process, the gate sticks to the gate sleeve and is not easy to come out. When the mold is opened, the product has crack damage. In addition, the operator must knock out the tip of the copper rod from the nozzle to loosen it before demoulding, which seriously affects the production efficiency. The main reason for this failure is the poor finish of the gate taper hole and the knife marks in the circumferential direction of the inner hole.

The second is that the material is too soft, the small end of the taper hole is deformed or damaged after a period of use, and the spherical arc of the nozzle is too small, causing the gate material to produce a rivet head here. The taper hole of the sprue sleeve is difficult to process, and standard parts should be used as much as possible. If you need to process it yourself, you should also make or buy a special reamer. The taper hole needs to be ground to above Ra0.4. In addition, should have gate pulling rods or gate ejection mechanisms on the mould.