Our Recent News

Nine common problems of color masterbatch

  1. Under sunlight, there are striped pigment bands in the product

This problem needs to be considered from two aspects of plastic physical and mechanical properties and plastic molding process:

Nine common problems of color masterbatch

Influence of physical and mechanical properties of plastics:https://solidcomould.com/product/2-cavity-plastic-flower-pot-mould/

  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. The injection molding machine does not add a certain amount of back pressure, and the mixing effect of the screw is not good.
  1. The dispersibility of the color masterbatch is not good or the plasticization of the resin is not good. The process can be debugged as follows:
    1. Slightly increase the temperature of the part of the mixing chamber close to the discharge port
    2. Apply a certain back pressure to the injection molding machine. If there is still no improvement after the above debugging, it may be the dispersion or matching of the color masterbatch and resin, and you should contact the color masterbatch manufacturer to solve it.
    3. After using a certain color masterbatch, the product appears to be easier to break

This may be due to poor diffusion and mutual solubility caused by the poor quality of the dispersant or additives selected by the manufacturer, which affects the physical and mechanical properties of the product. the

   3. After using the ratio on the color masterbatch manual, the color is too dark (too light)

Although this question is simple, there are many possibilities, specifically:

  1. The color masterbatch has not been carefully tested, and the pigment is too little or too much
  2. The measurement is inaccurate during use, and there are a large number of random measurement by domestic enterprises, especially small and medium-sized enterprises.
  3. There is a problem with the matching of color masterbatch and resin. This may be due to the improper selection of the carrier of the color masterbatch, or the manufacturer may change the resin variety at will
  4. The temperature of the machine is improper, and the color masterbatch stays in the machine for too long

Processing procedure: first check whether the resin type matches the color masterbatch and whether the measurement is accurate, and then adjust the machine temperature or speed, if there are still problems, please contact the color masterbatch manufacturer.

   4. Under the same conditions, the color of the products injected by different injection molding machines has different shades

This is often caused by the injection molding machine. Different injection molding machines have different mechanical states due to different manufacturing, use time or maintenance conditions, especially the difference in the degree of closeness between the heating element and the barrel, so that the dispersion state of the color masterbatch in the barrel is also different. The above phenomenon will appear.https://www.sciencedirect.com/science/article/abs/pii/S0263436823002123

   5. After changing to another brand of resin, the color has changed

The density and melt index of different grades of resin will be different, so the performance of the resin will be different, and the compatibility with the color masterbatch will also be different, resulting in color change. Generally speaking, as long as the difference between the density and melt index is the same If the color is large, the color difference will not be too large, and the color can be corrected by adjusting the amount of color masterbatch.

   6. Does the pigment migration that occurs during the storage of the masterbatch affect the quality of the product?

Some masterbatches have high pigment content (or dyes), in which case migration is normal. Especially the color masterbatch with dye added will have serious migration phenomenon. But this does not affect the quality of the product, because after the color masterbatch is injected into the product, the pigment is in the normal color development concentration in the product.

   7. Why do some injection products have bad luster?

There are several possibilities:

  1. The nozzle temperature of the injection molding machine is too low
  2. The mold finish of the injection molding machine is not good
  3. The product molding cycle is too long
  4. The masterbatch contains too much titanium
  5. The dispersion of color masterbatch is not good
    1. After a period of time, some plastic products will fade

The quality of the basic pigments used by the manufacturer is not good, and drift occurs.

  9. Why is ABS color masterbatch particularly prone to chromatic aberration?

Different grades of ABS produced in various countries have large color differences, and even the same grade of ABS may exist in each batch. However, this chromatic aberration is generally not serious. Users must pay attention to this feature of ABS when using ABS color masterbatch.

Scroll to Top