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What are the differences between spraying and roller coating of aluminum plates

Update:16-10-2020
Summary:

There are mainly two types of aluminum plates: spraying […]

There are mainly two types of aluminum plates: spraying and roller coating. The difference between the two is not limited to the difference in surface.
Common sprayed aluminum panels include: fluorocarbon spraying, polyester spraying, and powder spraying. As for other acrylic sprays, epoxy powder spraying is rare and the quality is not good. There are also two types of roller coating aluminium sheet: fluorocarbon roll-coated aluminum and polyester roll-coated aluminum. The corresponding scope of application is outdoor and indoor.
The spraying production of aluminum plates is divided into two major steps:
The first step in aluminum sheet processing is sheet metal processing. This process is mainly to process the aluminum plate into the shape and size required for construction by cutting, folding, arcing, welding, and polishing the flat plate.
The second step of aluminum plate processing is spraying. Spraying is to spray paint on the processed sheet metal. There are two types of spraying, one is manual spraying and the other is machine spraying. Machine spraying is generally only suitable for regular flat plates, but this kind of aluminum plate is rarely used in actual use, and most domestic manufacturers use manual spraying. Manual spraying can cause poisoning and affect human health.
Compared with sprayed plates, the thickness of roll coated plates is thinner. The roller coating production line generally has two coatings and two baking or one coating and one baking. According to the characteristics of the roller coating process, the thickness of the roller coating plate is less than 25um . A thin coating will reduce its UV penetration resistance and wind erosion resistance. In order to reach the thickness of 40um , the roller-coated plate has to be coated and baked multiple times (such as four-coated and four-baked), and the aluminum coil is passed through the roller coating line twice. In this way, the molecular binding force between the layers is lower than the molecular binding force within the layer, and small external molecules are likely to diffuse along the layer to corrode the coating and the substrate.
From the above, we can see that the difference between sprayed aluminum sheet and roll coated aluminum sheet is not only on the surface, but also the most obvious difference in the film formation sequence or the forming sequence. The sprayed aluminum sheet is formed first, so its moldable shape is much better. The shape is convenient, and the folding, engraving, arc bending, welding, punching, etc. will not have any effect on its surface.
The roll-coated board is formed into a film in advance, which means that many processes are restricted. If the paint surface is accidentally damaged, it is difficult to uniformize the color of the later repair. It is often said that the first batch of roll-coated sheets is different from the second batch. This means that roll-coated aluminum sheets can only be folded and made very simple, but often the construction site cannot always be simple Tablet. Corners, engraving, curved arcs, etc. are not possible with roller coating. The thickness of roller coated aluminum plates is not very large. There are corresponding restrictions on the thickness of aluminum coils. Roll coated plates are generally used to make aluminum honeycomb panels. .

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