We must carry out sampling test color before injection moulding

Update:14 Dec 2018

Since most injection moulding manufacturers do not prod […]

Since most injection moulding manufacturers do not produce plastic masterbatch or color masterbatch themselves, the focus can be on production management and raw material inspection. 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 color masterbatch, we must carry out sampling test color before mass production, both the same as the last proofreading, but also in this comparison, if the color difference is not big, can be considered qualified, as the batch color master has a slight color difference, can be The color masterbatch is remixed and then used to reduce the color difference caused by the uneven mixing of the color masterbatch 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.

Eliminate the influence of uneven mixing of masterbatch and masterbatch

Poor mixing of the plastic masterbatch with the color masterbatch will also make the color of the product change. After the masterbatch and the color masterbatch are mechanically mixed, when the hopper is fed into the hopper through the lower suction, the color masterbatch is separated from the masterbatch due to the action of static electricity, and is easily adsorbed on the hopper wall, which is bound to cause a change in the amount of the masterbatch during the injection moulding cycle, thereby generating Color difference.

In this case, the raw material can be sucked into the hopper and then manually stirred. For the addition of toner to produce colored products, the most effective way is to not use the suction machine, but use a hot air dryer to manually prevent the color difference caused by the separation of the toner from the masterbatch.