I. Why does the injection mold product appear dark and glossy
Injection mold is a tool for producing plastic products; it is also a tool for giving plastic products complete structure and precise dimensions. In the process of processing and manufacturing injection molds, the phenomenon of dark color and poor gloss is often encountered, so what is the reason for the dark color and poor gloss? How to solve it?
In the normal production and processing of injection molds, the gloss of the mold surface is mainly determined by the type of plastic, colorant and the smoothness of the mold surface. The main reasons and solutions for the appearance of dark color and poor gloss are as follows.
1. The finish of the injection mold is poor, the surface of the cavity has rust, etc., and the mold exhaust is not good.
2. Too much recycled material is 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.
3. The gating system of the injection mold is defective. The cold slug well should be enlarged, and the runner, polished main runner, runner and gate should be enlarged.
4. The material temperature and mold temperature are low. If necessary, the local heating method of the gate can be used.
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. The clamping force of the injection mold should be sufficient during the manufacturing process.
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 dark surface.
8. Prevent cold material from entering the workpiece, and use self-locking springs or reduce nozzle temperature if necessary.
If you do the above 8 points, you can well avoid the phenomenon of dark color and poor gloss in the injection mold. Even if this phenomenon occurs in the production process, you can take good remedial measures to minimize the production of the enterprise. The impact of the progress, increase the production efficiency of the enterprise.
