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Do your gi colour coated sheet occur color difference?

October 10, 2017No CommentsCAMELSTEEL

With the social development, the applications of gi colour coated sheet become more widely. Such as the large quantities of applications in the home appliance shell and roof. But any product may have some problems in the course of use, gi colour coated sheet is no exception.

For example, there may occur color difference when spry to gi colour coated sheet, and here are the main reasons:
1. Chemical coating treatment. Improper chemical coating process, resulting that the coating is too thick; the plate temperature is insufficient after drying, or there’s injury on coating roller; yellow patches will be formed after drying. These will all cause the color difference of prepainted galvanized steel coil.
2. Painting. Due to uneven mixing of paint or big paint viscosity difference of different barrels, the paint in the tray will extend from the feed side of the mouth to the direction of the reflux inlet. And then occur the color difference band.
Besides, when the staff in CAMELSTEEL change the painting color, especially the color contrast is large, they will clean to avoid color difference caused by pollution.
3. If the zinc spangles size of the substrate are different, there will form many different sizes of small pits in the grain boundary, that will impact the color difference of board surface, light color is particularly evident.
4. When there’s color difference during the using process, such as in the use of as roof sheet, it means the damage of the protective layer, and will shorten the service life. So we recommend that you must choose to buy the color coated steel coil with quality protection as CAMELSTEEL.
5. Cooling water. The atomization cool, and cooling water is not replaced in time, when the volatile matters of organic solvent in the furnace meet cold and condensed down, it will bring to the board surface followed by cooling water, ans then cause color difference in the board after malaxating by the wringing roller.
Control the color difference is one of the key factors to ensure product quality, so be sure to cause the attention of each staff. Manufacturers should strictly control the various production processes to provide customers with quality products.
Previous post The texture grade and surface treatment of hot galvanizing products Next post Color Coated Steel Sheet— the new star of steel market

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