How to control the color difference of injection products

- Feb 21, 2019-

1. Eliminate the influence of injection molding machine and mold factors

To choose the injection molding machine with the same capacity as the injection molding product, if the injection molding machine has problems such as material dead Angle, it is best to replace the equipment.For mold casting system, vent caused by color difference, can be resolved by the corresponding part of the mold repair mold.Problems with injection molding machines and molds must be solved before production can be organized to reduce the complexity of the problem.

2. Eliminate the influence of raw material resin and color masterbatch

Control of raw materials is the key to completely solve the color difference.Therefore, especially in the production of light color products, the thermal stability of raw materials resin can not be ignored on the product color fluctuations of the obvious impact.

Since most injection molding manufacturers do not produce plastic masterbatches or color masterbatches themselves, attention can be focused on production management and raw material inspection.That is to strengthen the inspection of raw materials into the warehouse;In the production of the same product as far as possible using the same manufacturer, the same brand of masterbatch, masterbatch production;

For color masterbatch, we need to carry out sampling test before mass production, both with the last proof, but also in this comparison, if the color difference is not big, can be considered qualified, as batch color masterbatch has a slight color difference, can be remixed after use, in order to reduce the color masterbatch itself caused by uneven mixing.At the same time, we also need to focus on the test of raw material resin, color masterbatch thermal stability, thermal stability is not good, we suggest that the manufacturer for replacement.

3. Eliminate the influence of uneven mixing of color masterbatch and masterbatch

Plastic masterbatch with color masterbatch mix is not good also can make product color is changeful.After the masterbatch and color masterbatch machinery are mixed evenly, the color masterbatch is separated from the masterbatch due to the electrostatic effect when it is sent to the hopper through the lower suction material. It is easy to adsorb on the hopper wall, which is bound to cause the change of color masterbatch in the injection cycle, thus resulting in color difference.


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