The Pu Pigment Manufacturer Will Introduce You to The Ten Factors that cause the color instability of injection molding products

In injection molding production, sometimes the color changes every few days, or even several color deviations occur in one day. There are still many factors that cause color instability. Below, Ningbo Zhongyuan Pu Pigment is in place. We will list some of the main factors that will cause color instability, so that we can improve it during production.

1. The temperature of the injection molding machine is unstable, sometimes high and sometimes low, and the color will be unstable. This is a major factor that needs to be checked first.
2. The production cycle is unstable, it starts and stops, and the back pressure is adjusted too much to cause the running temperature, which will change the color.
3. The mixer does not mix the toner and raw materials according to the requirements of the mixing process. For example, the mixing time is insufficient, the feeding method or order is not equal, and the toner is not uniform. This point should also be checked.
4. The baking temperature is too high or too long. Every raw material and pigment has its own range of baking temperature and time. Seriously beyond this range, the color of the injection molded parts will change. If the feeding time is more and less, the color that is more obviously affected by temperature will also become unstable, such as the color containing fluorescent material or light-colored injection parts. Therefore, for temperature-sensitive plastics, it is best not to
It is safest to bake the ingredients or use the bottom temperature to bake the ingredients.
5. In the baking hopper, due to the influence of the hot air, the toner is partially concentrated, which makes the color darker and darker.
6. The grades of the raw materials are inconsistent. Due to the different background color of each raw material, the color of the same toner injection molding parts will be different. Sometimes the same supplier has different batch numbers of raw materials, and the background color will have some deviation. Therefore, for products with high color deviation requirements, it is even necessary to control whether the background color of each batch of incoming materials is consistent.
7. The quality of the toner is too poor, it is not heat-resistant, or the wrong toner is used for the raw material, which will make the color unstable.