Today, Xiaobian tells you about the five major reasons for the color difference caused by
plastic coloring granulation, and hopes to help everyone.
1. The color master is directly produced and granulated without serious color test.
It is recommended to use a high concentration of color masterbatch instead of toner granulation. If you are not 100% confident, please test it on the test line first. After the test line is qualified, it will be produced on the production line. Sometimes the test line is qualified, the production line is not necessarily qualified, and it needs to be re-allocated. Therefore, careful color test is a more effective method to reduce production costs and reduce waste.
Second, there is a problem with the matching of color masterbatch and resin
Because the carrier of the masterbatch is not properly selected, or the manufacturer arbitrarily changes the variety of the resin. Different grades of resin will have different density and melt index, so the properties of the resin will be different, and the compatibility with the masterbatch will be different, so that color change occurs. Generally speaking, as long as the density and melt index are not different. Large, then the difference in color will not be too large, you can correct the color by adjusting the amount of color masterbatch.
Third, the measurement is not accurate, the color masterbatch, too much pigment or too little
There are a large number of phenomena that domestic enterprises, especially small and medium-sized enterprises, are arbitrarily measured. When weighing, the proportion, weight and variety are mistaken, resulting in poor color and standard of the masterbatch produced. These are some low-level mistakes that can be overcome as long as they are serious. The higher the accuracy, the better the accuracy, which can also reduce the production of non-conforming products to a certain extent.
Fourth, toner heat resistance
Due to improper machine temperature, especially high, the color master stays in the machine for too long, causing the toner to burn out, resulting in a difference in color. Generally, the heat resistance of inorganic pigments is relatively good, which basically satisfies the requirements of plastic processing, and the heat resistance of organic pigments is relatively poor.
Generally, the higher the temperature, the shorter the heat resistance time.
Therefore, when the machine temperature is too high, the color masterbatch or toner stays in the machine for too long, causing the toner to be burned, resulting in chromatic aberration.
Fifth, the impact of the production process
1. Drying link
ABS, PC, PA and other raw materials need to be dried before the color matching. If the baking time is too long and the baking temperature is too high, the raw material base color will be yellow or discolored to cause color difference.
2. Mixing link
In the mixing process, the material tank is not washed, it will be mixed with other colors to produce chromatic aberration; if the mixing time is not enough, it will be mixed with other colors to produce chromatic aberration; if the mixing time is insufficient or too much material will cause uneven mixing, chromatic aberration will also occur. .
3. Feeding link
Refueling production must be cleaned and the production is continued after drying.
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