1、 Under the sunlight, there are striped pigment bands in the products
This problem should be considered from two aspects: the physical and mechanical properties of plastics and the molding process of plastics
The physical and mechanical properties of plastics are affected by the following factors
1. The temperature of the injection molding equipment is not well controlled, and the color masterbatch cannot be fully mixed with the resin after entering the mixing chamber.
2. Injection molding machine did not add a certain back pressure, screw mixing effect is not good.
3. The dispersion of color masterbatch is not good or the resin plasticization is not good.
The process can be adjusted as follows:
1. Slightly increase the temperature of the mixing chamber near the blanking port
2. Apply back pressure to the injection molding machine.
If it is still not good after the above debugging, it may be the dispersity or matching problem of color masterbatch and resin, and it should be solved by contacting the color masterbatch manufacturer.
2、 After using some color masterbatch, the product appears to be easy to crack
This may be due to the poor quality of dispersants or additives selected by the manufacturer, resulting in poor diffusion and mutual solubility, which affects the physical and mechanical properties of the products.
3、 The color is too dark (too light) after using according to the proportion in the color master manual
Although this problem is simple, there are many possibilities
1. The color masterbatch has not been tested seriously, and the pigment is too little or too much
2. The measurement is not accurate when it is used, and there are a lot of random measurement phenomena in domestic enterprises, especially in small and medium-sized enterprises
3. There is a problem in the matching of color masterbatch and resin, which may be due to the improper selection of Color Masterbatch carrier or the random change of resin variety by the manufacturer
4. The temperature of the machine is improper and the color masterbatch stays in the machine for a long time
Treatment procedure: firstly, check whether the resin variety matches the color masterbatch and whether the measurement is accurate. Secondly, adjust the machine temperature or speed. If there are still problems, contact the color masterbatch manufacturer.
4、 Under the same conditions, the color of products injected by different injection molding machines is different
This is often caused by the injection molding machine. Different injection molding machines have different mechanical conditions due to different manufacturing, use time or maintenance conditions, especially the difference of the close degree between the heating element and the barrel, which makes the dispersion state of color masterbatch in the barrel different.
5、 After changing to another brand of resin, the color changed
The density and melt index of different brands of resin will be different, so the performance of resin will be different, and the compatibility with color masterbatch will also be different, resulting in color change. Generally speaking, as long as the density and melt index are not different, the color difference will not be too big, and the color can be corrected by adjusting the amount of color masterbatch.
6、 Does pigment migration during color master storage affect product quality
Some color masterbatch pigment content (or dye) is very high, in this case, migration phenomenon is normal. In particular, the color masterbatch with dyes will have serious migration. But this does not affect the quality of the product, because the pigment in the product is in the normal color concentration after the color masterbatch is injected into the product.
7、 Why is the luster of some injection products not good?
There are many possibilities:
1. The nozzle temperature of injection molding machine is too low
2. The mold finish of injection molding machine is not good
3. Product molding cycle is too long
4. Too much titanium dioxide in Color Masterbatch
5. The dispersion of color masterbatch is not good
8、 After a period of time, the color of some plastic products will fade
The quality of the basic pigment used by the manufacturer is not good, resulting in drift phenomenon.
9、 Why is ABS color master particularly prone to color difference?
The color difference of different brands of ABS produced in different countries is large, even if the same brand of ABS, each batch number may exist. However, this color difference is generally not serious. Users must pay attention to this feature when using ABS color masterbatch.
