With the improvement of people's awareness of environmental protection, color steel sandwich panels are becoming more and more popular because of their light weight, heat insulation, bright colors, flexible and fast installation and other characteristics. Due to the different manufacturing processes of manufacturers, the surface will have color difference. How to solve this problem? Jinan Color Steel Sandwich Panel Factory will explain to you.
1、 Matrix. The zinc flakes of different sizes will form many small pits at the grain boundary, which will affect the color difference of the plate surface, especially the light color. Choose a zinc-free or small-flowered substrate.
2、 Paint. Due to the uneven mixing of the coating or the large difference in viscosity of the coating of different barrel types, the coating extends from the inlet to the reflux port in the material tray, and the color strip of the color steel sandwich plate. In addition, when changing the paint color, the special proportion is that the color contrast is large, because the cleaning is not clean, resulting in color difference pollution
3、 Film thickness. The stability of film thickness has a great influence on the color difference of color steel sandwich panel. The film thickness adjustment mainly includes: coating viscosity, adjusting the gap between the rubber roller and the coating roller, changing the roller speed of the coating roller and the rubber roller, and adjusting the pressure between the coating roller and the strip steel support roller.
4、 Chemical coating treatment. Improper coating process leads to too thick coating film, insufficient drying plate temperature, or damage to the coating roller body, which forms yellow patches after drying, and the color difference of the coating plate is large, especially the light color is obvious.
5、 Cooling water. For atomization cooling, the cooling water was not replaced in time. After the volatile organic solvent in the furnace gas was cooled and condensed, the cooling water was brought to the plate surface after being squeezed by the extrusion roller, resulting in the color difference of the plate surface. During the production process, the cooling water should be properly kept overflowing, so that the condensate volatiles can be discharged in time to avoid the chromatic aberration of the plate surface.
6、 PMT. PMT represents the peak temperature of the color steel plate required for the strip steel when the coating is intact and cured. The stability of PMT has a great influence on the color difference of color plate. PMT adjustment mainly includes: change of strip steel specification will cause PMT change, local high or low temperature will affect PMT, uneven substrate thickness PMT change, seasonal change of furnace temperature and PMT change.
The reasons for color difference of color steel sandwich panels are explained from the above six aspects. If you have any doubts or questions about this, please come to our website http://www.jnhscg.com Consult!