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Six Details To Control The Color Difference Of Producing Cosmetic Tube

Update time : 2022-12-30 13:57:42

In the production process of cosmetic tubes, injecting head is an indispensable process, and the influence of color difference cannot be avoided in the process of injecting head. Chromatic aberration is not only a common defect in the cosmetic tube injection process, but also a common defect in other injection molded parts. Because there are many factors involved, it is difficult to avoid the trouble caused by chromatic aberration. So what factors can cause chromatic aberration of producing cosmetic tube? Is there any way to reduce the color difference?

There are many factors affecting color difference, involving raw material resin, color masterbatch, mixing of color masterbatch and raw materials, injection molding process, injection molding machine, mold, etc. Because of the wide range of involvement, color difference control technology is also recognized as one of the most difficult technologies in injection molding.

Pay attention to six small details during the production of injection molding, which can reduce the impact of scrapping due to color difference during injection molding.

1. Eliminate the influence of external factors such as machines and molds
If the injection molding machine has problems such as material dead ends, it is best to replace the equipment. For the color difference caused by the mold gating system, exhaust groove, etc., it can be solved by repairing the corresponding part of the mold.

2. Eliminate the influence of raw resin and color masterbatch
Controlling raw materials is the key to completely solving chromatic aberration. Therefore, especially when producing light-colored products, the obvious influence of different thermal stability of raw material resins on product color fluctuations cannot be ignored.

3. Eliminate the influence of uneven mixing of color masterbatch and masterbatch
Poor mixing of plastic masterbatch and color masterbatch will also cause the color of the product to change.

4. Reduce the influence of barrel temperature on color difference
In production, it is often encountered that the temperature of the barrel changes sharply due to the failure of a certain heating ring or the out-of-control long-term burning of the heating control part, resulting in color difference. Therefore, it is necessary to check the heating part frequently during production, and replace and repair it in time when it is found that the heating part is damaged or out of control, so as to reduce the probability of such color difference.

5. Reduce the impact of injection molding process adjustments
When the injection molding process parameters need to be adjusted due to non-color difference, try not to change the injection molding temperature, back pressure, injection molding cycle and color masterbatch addition amount. At the same time, it is necessary to observe the influence of the change of process parameters on the color. If the color difference is found, it should be adjusted in time.

6. Master the influence of barrel temperature and masterbatch quantity on product color change
Before adjusting the color difference, it is also necessary to know the trend of product color change with temperature and color masterbatch amount. Different color masterbatch changes with the production temperature or the amount of color masterbatch, and the color change law of the product is different. Its change law can be determined through the color test process.

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