Analysis of the reasons for the color difference of the injection products and the solution of the filling masterbatch manufacturers tell you
2019-03-15 11:09 来源:凯杰塑料填充母料厂家作者:熊猫 Time: 2019-03-15 11:09 Source: Qiagen manufacturers of plastic filled masterbatch: Panda
Many years of experience of filler masterbatch manufacturers can help you analyze the causes of plastic products and the solutions.
Chromatic aberration is a common defect in injection molding. It is not uncommon for injection molding machines to be discarded in batches due to the difference in color of matching parts. There are many factors affecting color difference, including raw material resin, color masterbatch (or toner), mixing of color masterbatch and raw material, injection molding process, injection molding machine, mold, etc. Because of the wide range of involved areas, the color difference control technology is also recognized as difficult in injection molding. Master one of the techniques. 做的产品不能有效帮助解决这个问题，但是在实际的生产过程中凯杰也整理出以下六个方面来进行色差的控制。 Although products made by manufacturers of filling masterbatches cannot effectively solve this problem, Kaijie also sorts out the following six aspects to control the color difference in the actual production process.
1. Eliminate the influence of injection molding machine and mold factors
To choose an injection molding machine with a capacity equivalent to that of the injection molded product, if the injection molding machine has problems such as material dead ends, it is best to replace the equipment. For the mold casting system, exhaust grooves, etc., which can cause color difference, it can be solved by the maintenance mold of the corresponding part of the mold. The problems of injection molding machines and molds must be solved before the production can be organized to reduce the complexity of the problem.
2. Eliminate the influence of raw resin and color masterbatch
Controlling raw materials is the key to thoroughly solving color differences. Therefore, especially in the production of light-colored products, the obvious influence of the thermal stability of the raw material resin on the color fluctuation of the product cannot be ignored. Since most injection molding manufacturers do not themselves produce plastic masterbatches or color masterbatches, the focus can be on production management and raw material inspection. That is to strengthen the inspection of raw materials in storage; the same product should be produced as much as possible by the same manufacturer, the same brand of masterbatch, and the color masterbatch; for the color masterbatch, we need to carry out spot checks and test colors before mass production. In this comparison, if the color difference is not large, it can be regarded as qualified. As the batch color masterbatch has a slight color difference, the color masterbatch can be re-mixed and then used to reduce the color difference caused by uneven mixing of the color masterbatch itself. At the same time, we also need to focus on the thermal stability of the raw resin and color masterbatch. For those with poor thermal stability, we recommend manufacturers to replace them.
3. Eliminate the effect of uneven mixing of color masterbatch and masterbatch
Poor mixing of plastic masterbatch with color masterbatch will also make the product color volatile. After the masterbatch and the masterbatch are mixed uniformly, when they are fed into the hopper through the lower suction, the masterbatch is separated from the masterbatch due to the electrostatic effect and easily adsorbed on the hopper wall. This will inevitably cause the change of the amount of the masterbatch during the injection cycle, which will cause Chromatic aberration.
In this case, the raw materials can be sucked into the hopper and then manually stirred. For adding colored toner to produce colored products, the most effective method is not to use a suction machine, but to use a hot air dryer, using artificial feeding to prevent the color difference caused by the separation of toner from the masterbatch.
4.Reduce the influence of barrel temperature on color difference
In production, it is often encountered that the barrel temperature is greatly changed due to the failure of a certain heating coil or the heating control part is out of control and long-term burning, resulting in color difference. The color difference caused by this kind of reason is easy to judge. Generally, the color difference caused by the damage and failure of the heating coil will be accompanied by the uneven plasticization phenomenon, and the uncontrollable long-heating of the heating control part is often accompanied by product air spots, severe discoloration and even coking. Therefore, the heating part needs to be frequently checked during production, and the heating part should be replaced and repaired in time if it is found to be damaged or out of control, so as to reduce the possibility of such color differences.
5, reduce the impact of injection molding process adjustment
When it is necessary to adjust the injection molding process parameters for non-color difference reasons, try not to change the injection temperature, back pressure, injection cycle and the amount of color masterbatch. At the same time, adjust the process parameters to observe the impact of color changes. If you find that the color difference should be adjusted in time. As far as possible, avoid using high injection speed, high back pressure and other injection molding processes that cause strong shear, and prevent color differences caused by local overheating or thermal decomposition. Strictly control the temperature of each heating section of the barrel, especially the nozzle and the heating part close to the nozzle.
6.Master the influence of barrel temperature and color masterbatch on product color change
Before adjusting the color difference, you must also know the trend of product color changes with temperature and color masterbatch. With the change of production temperature or the amount of color masterbatch, the color change rules of products are different. It can be determined through the color test process. Unless the color change rule of this masterbatch is known, it is impossible to adjust the color difference quickly, especially when using new masterbatch toning.
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