1、 Under sunlight, there are striped pigment strips in the products. This problem should be considered from two aspects: the physical and mechanical properties of plastics and the plastic molding process
1.1 the temperature of the injection molding equipment is not well controlled, and the masterbatch cannot be fully mixed with the resin after entering the mixing chamber.
1.2 injection molding machine does not add a certain back pressure, the mixing effect of screw is not good.
1.3 the dispersion of color masterbatch is not good or the resin plasticization is not good.
The process of color masterbatch can be adjusted as follows:
1. Slightly increase the temperature of the mixing chamber near the discharge port
2. Apply back pressure to the injection molding machine. If it is still not good after the above debugging, it may be due to the dispersion or matching of color masterbatch and resin, and should contact the color master batch manufacturer
Contact to solve.
2、 After using some color masterbatch, the product appears to be easy to crack
This may be due to the poor quality of dispersant or additives selected by the manufacturer, resulting in poor diffusion and mutual solubility, which affects the physical and mechanical properties of the products.
3、 After being used according to the proportion in the instruction manual of Color Masterbatch, the problem that the color is too dark (too light) is simple, but there are many possibilities
3.1. The masterbatch has not been carefully tested, and there are too few or too many pigments
3.2. The measurement is not accurate when using, and there are a large number of domestic enterprises, especially small and medium-sized enterprises, to measure at will
3.3. There are some problems in the matching of masterbatch and resin, which may be due to improper selection of carrier of Color Masterbatch or random change of resin varieties by manufacturers
3.4. Improper machine temperature, color masterbatch stay in the machine for too long processing procedures: first, check whether the resin type 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、 Why do different injection molding machines produce different colors for the same masterbatch, resin and formula?
This is often caused by the injection molding machine. Different injection molding machines due to different manufacturing, use time or maintenance conditions, resulting in different mechanical conditions, especially the difference in the degree of close contact between the heating elements and the barrel, so that the dispersion of color masterbatch in the barrel is not the same, the above phenomenon will appear.
5、 After changing to another brand of resin, the color of the same masterbatch and formula has changed. Why?
The density and melt index of different brands of resin will be different, so the performance of the resin will be different, and the compatibility with the masterbatch will also be different, so as to change the color. Generally speaking, as long as the density and melt index of the resin are not different, the color difference will not be too big. You can adjust the amount of masterbatch to correct the color.
6、 Does the migration of pigment during the storage of masterbatch affect the quality of products?
Some masterbatch pigment content (or dye) is very high, in this case, migration phenomenon is normal. In particular, the color masterbatch added with dyes will cause serious migration. However, this does not affect the quality of the product, because the color masterbatch injection into the product, the pigment in the product in the normal color concentration.
7. Why is the luster of some injection products not good? There are several possibilities:
7.1. The nozzle temperature of injection molding machine is too low
7.2. The mold finish of injection molding machine is not good
7.3. Too long molding cycle
7.4. Too much titanium dioxide in Color Masterbatch
7.5. The dispersion of color masterbatch is not good
8、 After a period of time, some plastic products will fade. The quality of the basic pigment used by the manufacturer is not good and drift phenomenon occurs.
9、 Why is ABS masterbatch particularly prone to color difference?
The color difference of different brands of ABS produced by different countries is large. Even if the same brand of ABS is used, there may be color difference in each batch number. Of course, color difference will appear after coloring with masterbatch. This is due to the characteristics of ABS, there is no complete solution in the world. However, this color difference is generally not serious. Users must pay attention to this characteristic when using ABS color masterbatch