Analysis of the causes of unstable color of injection molded shell parts

Now, the application of plastic shell has been widely up, life, we are very common, such as: electrical shells, and our usual washbasin, all belong to the plastic, but in the plastic processing, color instability is a common problem.



The first thing to check is the temperature of the injection molding machine, the color is unstable, and the temperature of the injection molding machine is sometimes high and low is related, so, in the plastic shell processing, must be a priority check. 2.

2. sometimes the back pressure is adjusted too much, the production cycle is not stable, the production cycle is not stable, on and off, will make the color change.

3. The mixer does not follow the mixing process to mix the color powder and raw materials, such as insufficient time, the way of adding materials or the order of adding materials is inconsistent leading to uneven color separation, which is also one of the causes of unstable color, so it is also important to check when processing plastic shells.

4. Because the humidity of the raw material is too large, the viscosity inside has not yet spread, and finally it will cause the unstable color of the plastic processing.

5. the amount of water outlet material back to the amount of more and less, which has a greater impact on the light-colored injection molded parts.

6. inconsistent grade of raw materials. As each raw material base color is different, resulting in the same color powder injection molding parts color will be different. Sometimes the same supplier, the raw material batch number is different, the base color will be some deviation, so the color deviation requirements of high products, and even to control to each batch of incoming material whether the base color is consistent.

7. The quality of the color powder is too poor, not heat-resistant, or with the wrong color powder for the raw materials, will make the color is not stable.