In the process of normal injection mold production and processing, the gloss of the mold surface is mainly determined by the type of plastic, the colorant and the finish of the mold surface. The main reasons and solutions for the dark color and poor gloss are as follows.
1. The finish of the injection mold is poor, the surface of the cavity is rusted, etc., and the mold is poorly vented.
2. Too much recycled materials are used, plastics or colorants are of poor quality, water vapor or other impurities are mixed, and lubricants used are of poor quality.
3. The gating system of the injection mold is defective. The cold slug well should be enlarged, the runner, polished main runner, runner and gate should be enlarged.
4. The material temperature and mold temperature are low, and local heating of the gate can be used if necessary.
5. Plastics must be fully plasticized, but they must be prevented from degrading. They must be stable when heated and adequately cooled, especially those with thick walls.
6. The clamping force must be sufficient during the production process of injection molds.
7. The processing pressure of the injection mold 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.
8. Prevent cold material from entering the workpiece, and use self-locking springs or lower the nozzle temperature if necessary.
Doing the above eight points can well avoid the phenomenon of dark color and poor gloss in the injection mold. Even if this phenomenon occurs during the production process, remedial measures can be taken to minimize the production progress of the enterprise. The impact of increasing the production efficiency of enterprises.
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