What are the reasons for product color difference in mold injection molding?

In the production and processing of mold injection molding, hot injection molding is one of the more common forming methods. The entire injection molding process and the resulting products are likely to encounter various difficulties. There is a problem that has a small impact on product characteristics but a significant impact on appearance, and that is color difference. So what aspects generally affect color difference?   

1. Masterbatch is a key element that causes color difference. The color quality of plastic products immediately depends on the quality of the basic color of the color masterbatch. The heat resistance, dispersibility, and masking ability of colorants are not only indicators for detecting the quality of colorants, but also immediately related to color difference. Choosing high-quality colorants not only helps to reduce color differences, but also enhances the overall appearance of injection molded products.

2. The temperature, working pressure, and melting time during the mold injection production process can also lead to color difference problems. In addition, processing factors such as different batch numbers and different machine equipment can also affect it.

3. Reducing the temperature of the material barrel has an impact on color difference. In production and manufacturing, it is common to encounter situations where a certain electric heating coil is damaged or ineffective, or when a part of the heating operation cannot be controlled and burned for a long time, resulting in a strong change in the temperature of the material barrel and causing color difference.

4. Reduce the impact of adjusting the injection molding process. When adjusting the main parameters of the injection molding process for reasons other than color difference, try not to change the injection temperature, condensing type, injection cycle time, and amount of color masterbatch. In addition, observe the effect of changes in the main parameters of the processing process on the color. If color difference is found, adjust it immediately.

5. If the raw material elements have been removed before production and color difference is found during mold injection molding production, it is only necessary to distinguish that it is a problem of mixing color masterbatch with plastic masterbatch. After establishment, it can be adjusted according to changing the injection molding temperature or condensation method. With an understanding of the trend analysis of color tones, it is relatively easy to ensure.