Why Does The Injection Mold Have A Dark Gloss?

Injection molds are a tool for producing plastic products; they are also tools that give plastic products complete structure and precise dimensions. In the process of manufacturing and manufacturing, the injection mold often encounters the phenomenon of dark color and poor gloss. What is the reason for the dark color and poor gloss?

In the normal injection mold manufacturing process, 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 for the occurrence of dark color and poor gloss and solutions are as follows.

1. The injection mold has poor finish, rust on the surface of the cavity, and poor mold discharge.

2. Excessive recycled materials are used, plastic or colorant is of poor quality, mixed with water vapor or other impurities, and the quality of the lubricant used is poor.

3. The casting system of the injection mold has defects. The cold material well should be enlarged, the flow channel should be enlarged, the main flow channel should be polished, the runner and the gate should be polished.

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

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

6. The clamping force should be sufficient during the manufacturing process of the injection mold.

7. The injection mold 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 darkening of the surface.

8. Prevent cold material from entering the part, if necessary, use a self-locking spring or lower the nozzle temperature.

Doing the above 8 points can well avoid the phenomenon of dark color and poor gloss of the injection mold. Even if this phenomenon occurs during the production process, it can be a good remedial measure to minimize the production progress of the enterprise. The impact of increasing the productivity of the enterprise.