Chromatic aberration is a common defect in injection molding. It is not uncommon for the injection molding machine to be scrapped in batches due to the color difference of the components. There are many factors that affect the color difference, involving raw materials, resin, masterbatch, masterbatch with the raw material mixture, injection molding process, injection molding machine, mold, etc., because of the extensive coverage, color control technology is also recognized in injection molding is one of the more difficult to grasp technology. In the actual production process, we generally control the color difference from the following six aspects.
1. Eliminate the influence of injection molding machine and mold factors
To select an injection molding machine with an injection capacity of the main product, if the injection molding machine has problems such as material dead angle, it is best to replace the equipment. For the mold casting system, exhaust groove, etc. caused by color, can be solved by the corresponding part of the mold maintenance model. Must first solve the injection molding machine and mold problems can organize production, in order to reduce the complexity of the problem.
2. Eliminate the influence of raw materials, resin and masterbatch
Controlling raw materials is the key to completely solving the color difference. Therefore, especially in the production of light-colored products, the thermal stability of the raw material resins must not be neglected to have a significant effect on the color fluctuation of the products. Since most injection molding manufacturers do not produce plastic masterbatches or masterbatches themselves, the focus of attention can be on production management and raw material inspection. That is to strengthen the inspection of raw materials into storage.
The same product in the production uses the same manufacturer, the same brand masterbatch and masterbatch as much as possible. For the masterbatch, we must conduct sampling test before the mass production, which is not only the same as the previous proofreading, but also in this comparison, if the color The difference is not big, can be considered as qualified, as the color masterbatch has a slight color difference, the masterbatch can be re-mixed before use to reduce the masterbatch itself caused by uneven color mixing. At the same time, we also need to focus on testing the thermal stability of raw materials, resin, color masterbatch, for poor thermal stability, we recommend manufacturers to exchange.
