From the perspective of the production process of aluminum veneer, the main steps of the multi-layer spraying process are: primer coating , topcoat, then the varnish coating, and finally the corresponding aluminum appearance curing effect treatment.
A primer coat helps seal the aluminum veneer substrate. As an inherent decoration, primer coat is mainly to improve the penetration resistance of the coating. With the protection of primer coat, the surface effect of the material can be stabilized, and the finishing effect has good uniformity, and the adhesion effect between the topcoat and the metal plate can be improved. Generally, the thickness of the primer is controlled at about 5-10 microns.
The topcoat coating is to spray the corresponding color on the surface of the aluminum veneer, which is an important step in decoration. The topcoat is directly painted on the surface of the aluminum veneer material, and it is operated according to the design requirements. The topcoat coating can not only add decorative effect to the appearance, but also beautify the aluminum veneer material, making it more suitable for the needs of building decoration. At the same time, it can prevent the aluminum veneer material from directly contacting the outside air, so that it is not attacked by acid rain, pollutants, etc., and delays the aging speed of the material. Generally, the thickness of the topcoat is required to be controlled at about 20-30 microns.
The third step is the varnish coating treatment. The main reason for the varnish treatment is to increase the anti-invasion ability of the coating to the external environment, better protect the integrity of the topcoat coating, enhance the gloss effect of the surface, and maintain the gloss of the color. The thickness of the varnish coating is generally required to be around 5-10 microns.
The final step of spraying the aluminum veneer is the curing treatment as a consolidation effect, that is, to further consolidate the three-layer coating, so that it has a better decorative effect. This step requires keeping the aluminum alloy material in the curing furnace for high temperature consolidation, and the temperature is controlled between 180-250 degrees Celsius.