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How to control the color difference of color coated galvanized sheet

Update:31 Jan 2019
Summary:

We all know that the color of galvanized steel coil is […]

We all know that the color of galvanized steel coil is various, the problem of coloring, how to control the color galvanized sheet without color difference, etc. are all problems that our manufacturers need to overcome, and also the key to ensure product quality.

The size of the zinc flower on the substrate is different. At the grain boundary, many small pits of different sizes are formed, which have an effect on the color difference of the board surface, especially for light colors. It is best to use a zinc-free flower or a small zinc flower substrate.

How to control the color difference of color-coated galvanized sheet, we use natural gas for the oven temperature, so the oven temperature is balanced, there will be no temperature difference between the time zones, and the paint must be evenly adjusted before production.The film thickness stability has a great influence on the color difference of the color coated plate. The film thickness is adjusted firstly by: the viscosity of the coating, adjusting the gap between the applicator roll and the applicator roll, changing the roll speed of the applicator roll and the applicator roll, and adjusting the between the applicator roll and the strip support roll. pressure.

Regarding the manipulation of the galvanized sheet leakage coating, the leak coating is formed by factors such as swimming, deformation, oxidation and the like. Of course, controlling the color difference is a key factor in ensuring the quality of the product, so it must be brought to the attention of each practitioner to ensure the availability of the product more effectively.
Because the paint is not uniformly stirred or the paint viscosity of the different barrels is large, the paint extends in the tray from the feed port side to the return port to present a color difference zone. In addition, the color of the paint is changed, and the color contrast is large. Because the cleaning is not clean, the pollution forms a color difference.