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Control of color difference of plastic turnover box products
- Jul 31, 2018 -

The color difference of the plastic turnover box is a common defect in the injection molding. It is not uncommon for the injection molding machine to be scrapped in batches due to the difference in the color of the matching parts. There are many factors affecting chromatic aberration, involving raw material resin, color masterbatch, color masterbatch and raw material mixing, injection molding process, injection molding machine, mold, etc. Because of the wide range of exposure, color difference control technology is also recognized as one of the hard-to-master technologies in injection molding. 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 the same capacity as the injection molding plastic turnover box, it is best to replace the equipment if the injection molding machine has problems such as dead spots. For the mold casting system, the exhaust groove, etc., the color difference can be solved by the maintenance mold of the corresponding part of the mold. The injection molding machine and mold problems 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 the raw materials of plastic crates is the key to completely solving the chromatic aberration. Therefore, especially in the production of light-colored articles, the significant influence of the difference in thermal stability of the raw material resin on the color fluctuation of the product cannot be ignored. Since most injection molding manufacturers do not produce plastic masterbatch or color masterbatch themselves, the focus can be on production management and inspection of raw materials for plastic crates. That is to strengthen the inspection of raw materials into the warehouse; the same product in production should be produced by the same manufacturer, the same brand masterbatch and color masterbatch; for the masterbatch, we must carry out sampling test before mass production, both the same as the last proofreading, but also In this comparison, if the color difference is not large, it can be considered qualified. As the batch color master has a slight color difference, the color master can be remixed and used to reduce the color difference caused by the uneven mixing of the color master itself. At the same time, we also need to focus on the thermal stability of the raw material resin and color masterbatch. For the poor thermal stability, we recommend that the manufacturer exchange.