We all know that the colour of colour-coated galvanized sheet is various. The colouring problem and how to control the colour difference of colour-coated galvanized sheet are the problems that our manufacturers need to overcome and the key to ensure the quality of products.
The different sizes of zinc flower on the substrate make up many small pits of different sizes at the grain boundary, which have an effect on the color difference of the surface of the board, especially on the light color. It is better to choose zinc-free or small zinc-based substrate.
How to control the color difference of color coated galvanized sheet? We use natural gas to supply the oven temperature for the production equipment. So the oven temperature is balanced, there will be no time interval temperature difference, and the paint must be adjusted uniformly before production.
The stability of film thickness has a great influence on the chromatic aberration of color coated panels. Firstly, the adjustment of film thickness includes: the coating viscosity, the gap between the adhesive roll and the coating roll, the change of the speed of the coating roll and the adhesive roll, and the adjustment of the pressure between the coating roll and the strip support roll.
As for the operation of color-coated galvanized sheet, the reason for the leakage is that the substrate has swimming, deformation, oxidation and other factors. Of course, controlling the color difference is the key factor to ensure the quality of products, so we must draw the attention of every worker, so as to ensure the availability of this product more effectively.
Because of the uneven mixing of coatings or the high viscosity of coatings in different barrels, the coatings extend from the side of the feed port to the direction of the reflux port in the material tray, showing a color difference band. In addition, the change of paint color, Tebby is a big contrast in color, because the cleaning is not clean, pollution forms a color difference.
Through the above content, we can see that the color difference problem of color coated panels is normal and inevitable. Therefore, it is suggested that users should purchase all the color difference in one time as far as possible. The color difference problem of color coated panels produced in the same batch may be relatively small.