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Color coated panels will appear color difference problems in several cases

2023-09-11

Color coated panels in what circumstances will appear color difference problem

1 Paint. Due to uneven mixing of paint or large differences in the viscosity of paint in different barrels, the paint extends in the material tray from the side of the feed port to the direction of the return port, and a color difference band appears. In addition to replace the paint color, especially the color contrast is large, due to cleaning is not clean, pollution caused by chromatic aberration.

2 Base plate. Base plate zinc flowers of different sizes, the formation of many small pits of different sizes at the grain boundaries, the impact of color difference on the plate surface, especially obvious for light colors. Good choice of non-zinc flower or small zinc flower base plate.

3 chemical coating treatment. Chemical coating process is not appropriate, resulting in chemical coating film is too thick, after drying the board temperature is insufficient, or coating roller roll body injury, after drying the formation of yellowish plaque, resulting in color coated plate color difference, especially light color is obvious.

4 Film thickness. Film thickness stability of color coated plate color difference has a greater impact. Adjustment of film thickness is mainly through: coating viscosity, adjusting the gap between the adhesive roller and the coating roller of the roller coating machine, changing the roller speed of the coating roller and adhesive roller, and adjusting the pressure between the coating roller and the strip support roller.

5 PMT. PMT indicates the peak temperature that the strip needs to reach when the coating is well cured. the stability of PMT has a big influence on the color difference of the color coated plate. the adjustment of PMT is mainly through: the change of the strip specification will cause the change of PMT, the local temperature will be high or low will affect the PMT, the thickness of the substrate is not equal to the change of PMT, the change of the temperature in the furnace in the seasonal change and the change of the PMT.

6 Cooling water. Atomized cooling, cooling water is not replaced in a timely manner, when the volatiles of organic solvents in the furnace gas condenses down in the cold, along with the cooling water is brought to the plate, after squeezing the drying rollers squeezed in the plate caused by color difference. In production, the cooling water should be properly maintained overflow, so that the condensed volatiles overflow in time to remove, to avoid causing color difference on the board.

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What are the properties of color coated coils in applications?

2023-09-11