1. In the sunlight, there are stripe-like pigment strips in the product. This issue needs to be considered from two aspects: plastic physical and mechanical properties and plastic molding process:
1.1 The temperature of the injection molding equipment is not controlled well, and the masterbatch cannot mix well with the resin after entering the mixing chamber.
1.2 The injection molding machine did not add a certain back pressure, and the mixing effect of the screw was not good.
1.3 The dispersibility of masterbatch is poor or the plasticization of the resin is not good.
The following adjustments can be made to the process: 1. Raise the temperature of the mixing chamber by a part of the blanking mouth slightly. 2. Apply a certain back pressure to the injection molding machine.
If the above adjustment is still not good, it may be the problem of dispersibility or matching of masterbatch and resin, and contact the masterbatch manufacturer to solve it.
2. After using some masterbatch, the products appear to be easier to break. This may be due to poor diffusion and miscibility of the dispersant or auxiliaries used by the manufacturer, which affects the physical and mechanical properties of the product.
3, according to the proportion of color masterbatch used, the color is too dark (too shallow)
Although this issue is simple, there are many possibilities. Specifically:
3.1. Color masters have not been carefully tried, too little or too much pigment
3.2. Inaccurate metering at the time of use, and there is a large number of phenomenon that domestic enterprises, especially SMEs, randomly measure
3.3. There is a problem with the matching of color masterbatch and resin, which may be due to the improper selection of the masterbatch carrier, or it may be that the manufacturer randomly changes the resin type.
3.4. Improper temperature of the machine, the masterbatch stays in the machine for a long time. Processing procedure: first check whether the resin type is matched with the masterbatch and whether the measurement is accurate. Secondly, adjust the machine temperature or rotation speed. If there are still problems, masterbatch manufacturer should be found. contact.
4, the same color masterbatch, resin and formula, different injection molding machine injection products why the color depth?
This is often the cause of the injection molding machine. Different injection molding machines may cause differences in the mechanical conditions due to differences in manufacturing, use time, or maintenance conditions, and in particular, the difference in the degree of closeness between the heating elements and the cartridge, so that the dispersion state of the masterbatch in the cartridge is also different. The phenomenon will appear.
5. After changing the resin of another brand, the color of the same masterbatch and formula has changed. Why?
Different grades of resin have different density and melt index, so the performance of the resin will be different, and the compatibility with the masterbatch will also be different, so that the color change occurs. Generally speaking, as long as its density and melt index are not different Large, then the difference in color will not be too much, you can correct the color by adjusting the amount of color masterbatch.
6. Does pigment migration during storage process affect the quality of the product?
Some masterbatch pigments (or dyes) are high, and in this case migration is normal. In particular, color masterbatches that incorporate dyes can cause serious migration. However, this does not affect the quality of the product, because after the masterbatch is injected into the product, the pigment is at a normal color concentration in the product.
7, why some of the injection products gloss is not good?
There are several possibilities:
7.1. Injection molding machine nozzle temperature is too low
7.2. Poor mold finish of injection molding machine
7.3. Product molding cycle is too long
7.4. Too much titanium dioxide in masterbatch
7.5. The dispersion of masterbatch is not good
8, some time later, some plastic products will fade.
The basic pigment used by the manufacturer is of poor quality and drifting occurs.
9, why ABS masterbatch is particularly prone to color differences?
The different grades of ABS produced in various countries have a large color difference. Even if the ABS of the same brand number is used, there may be color differences in each batch of lot numbers. Of course, color differences may also occur after color masterbatch is used. This is due to the characteristics of ABS. There is no complete solution at the international level. However, this color difference is generally not serious.
When users use ABS masterbatch, they must pay attention to this characteristic of ABS.
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