How to effectively control the color difference of injection molding products

Color difference is a common problem in injection molding products. How to effectively control color difference is very important to ensure product quality and improve customer satisfaction. Here are a few practical strategies to help you solve this problem.

1. Master the influence of cylinder temperature and color masterbatch on product color change

Before color difference adjustment, it is necessary to know the trend of product color change with temperature and color masterbatch. Different color masterbatches with the production of temperature or color masterbatches change, the product color change law is different. The change rule can be determined by the process of color testing.

2. Reduce the impact of injection molding process adjustment

When the injection molding process parameters need to be adjusted for non-color difference reasons, the injection molding temperature, back pressure, injection molding cycle and the amount of color masterbatch should not be changed as much as possible, and the adjustment should also observe the impact of the change of process parameters on the color, such as the color difference should be adjusted in time. As far as possible, avoid the use of high injection speed, high back pressure and other injection molding processes that cause strong shear, to prevent color differences caused by local overheating or thermal decomposition.

3. Reduce the influence of cylinder temperature on color difference

In production, color difference is often caused by the failure of a heating ring or the heating control part is out of control. The color difference caused by such reasons is easy to determine, and the color difference caused by the failure of the general heating ring will be accompanied by the uneven plasticization phenomenon, and the heating control part is often accompanied by the product gas spot, serious discoloration and even coking phenomenon.

4. Eliminate the influence of raw material resin and color masterbatch

Controlling raw materials is the key to completely solving the color difference. Therefore, especially in the production of light-colored products, the obvious influence of different thermal stability of the raw material resin on the color fluctuation of the product cannot be ignored. For the color master, we should conduct sampling test before mass production, both with the last proof, but also in this comparison, if the color difference is not large, can be considered qualified, as the batch of color master has a slight color difference, the color master can be remixed and used again to reduce the color difference caused by the uneven mixing of the color master itself.

5. Eliminate the influence of injection molding machine and mold factors

To choose an injection molding machine with the same capacity as the injection molding product, if the injection molding machine has problems such as material dead corners, it is best to replace the equipment. The color difference caused by the mold pouring system and exhaust groove can be solved by the maintenance die of the corresponding part of the mold. We must first solve the problem of injection molding machine and mold before we can organize production to reduce the complexity of the problem.

Through the above strategy, the color difference of injection molding products can be effectively controlled, and product quality and customer satisfaction can be improved. Let's start from the source, ensure that every link is done color control, to create high-quality injection products.