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How to deal with gloss defects on the surface of plastic injection molding molds?

Dec 29, 2021

There are many difficulties in plastic injection molding. The injection mold consists of a movable mold and a fixed mold. The production of plastic products requires injection molding. The plastic material is injected into the mold cavity of the injection mold through an injection molding machine, and it is formed after cooling and solidification. What should I do if there is a gloss defect on the surface of the plastic injection molding mold during the mold manufacturing process?

The following are the reasons and solutions for the surface gloss defects of plastic injection molding molds summarized by JHS, hoping to help you.

1. Poor mold finish, rust on the cavity surface, etc., poor mold exhaust.

2. The gating system of the mold is defective, the cold slug well should be enlarged, the runner, the polishing main runner, the runner and the gate should be enlarged.

3. The material temperature and mold temperature are low. If necessary, the local heating method of the gate can be used.

4. The processing pressure is too low, the speed is too slow, the injection time is insufficient, and the back pressure is insufficient, resulting in poor compactness and dark surface.

5. The plastic should be fully plasticized, but the degradation of the material should be prevented, the heating should be stable, and the cooling should be sufficient, especially for thick-walled ones.

6. Prevent the cold material from entering the workpiece, and use self-locking springs or reduce the nozzle temperature if necessary.

7. Too many recycled materials are used, the quality of plastics or colorants is poor, mixed with water vapor or other impurities, and the quality of lubricants used is poor.

8. The clamping force should be sufficient.

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