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How to deal with gloss defects on the surface of plastic injection molds?
2022/07/27
The following are the causes and solutions of the surface gloss defects of plastic injection molding molds, hoping to help you.
1. The mold finish is poor, the surface of the cavity has rust, etc., and the mold exhaust is poor.
2. The gating system of the mold is defective, the cold 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 cold material from entering the workpiece, and use self-locking springs or reduce nozzle temperature if necessary.
7. Too many recycled materials are used, the quality of plastic or colorant is poor, mixed with water vapor or other impurities, and the quality of the lubricant used is poor.
8. The clamping force should be sufficient.
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