What is the production process of aluminum veneer spraying?
What is the production process of aluminum veneer spraying?
Aluminum veneer spraying belongs to fluorocarbon spraying, the specific process is as follows:
Pre-treatment process: aluminum degreasing decontamination (pickling for about 10 minutes)→ water washing (through two channels of clean water)→ chromizing (about 5 minutes)→ water washing (through two channels of clean water)→100 degrees drying.
Spraying process: hook (hanging aluminum on the assembly line)→ polishing decontamination → spraying primer → top paint → varnish → curing (baking for about 20 minutes at 180℃-250℃)→ quality inspection → unloading → packing film.
1. The purpose of pretreatment: Before spraying aluminum alloy profiles and plates, the surface of the workpiece should be degreased, decontaminated and chemically treated to generate chromizing film, increase the binding force and oxidation resistance of the coating and the metal surface, which is conducive to extending the service life of the paint film. Some parts of aluminum are prohibited from spraying. After this process, a protective film or tape should be affixed to the corresponding part, and it should be torn off in time after spraying.
2. Hooks: Different shapes of aluminum are hung on the assembly line with corresponding hooks. Since the aluminum that the oven can accommodate can not exceed 6m, 1.1m, 2m, respectively, it should be hung at a suitable Angle and the suspension should be smooth. Before spraying the primer, observe whether there is dirt on the surface of the aluminum, sand it with sandpaper, and blow it clean with a spray gun.
3. Primer spraying: As the primer coating of the closed substrate, its role is to improve the permeability resistance of the coating, enhance the protection of the substrate, stabilize the metal surface, strengthen the adhesion between the top paint and the metal surface, and ensure the color uniformity of the top paint.
4. Top paint: Top paint coating is a key layer of spraying, which provides the decorative color required for aluminum, so that the appearance of aluminum meets the design requirements, and protects the metal surface from the external environment and prevents ultraviolet penetration. The anti-aging ability is greatly enhanced, and the top paint is the z-thick paint layer in the spray.
5. Varnish: The main purpose is to effectively enhance the resistance to external corrosion of the paint layer, protect the top paint, increase the metallic luster of the top paint color, and make the appearance more gorgeous.
6. Curing treatment: The aluminum sprayed three times enters the curing furnace for treatment, the curing temperature is generally between 180℃-250℃, and the curing time is about 20 minutes.
7. Quality inspection: Quality inspection according to inspection standards. Observe whether the surface is scratched or mottled, use the color meter to detect whether the color of the product meets the standard, and test whether the thickness of the paint layer meets the standard.
8. Hook down: When hook up, pay attention to remove the spray aluminum on the hook. When placed on the van, the paint faces the finish and the back faces the back to prevent scratching the spray layer.
9. Packaging: The packaging team will transport the sprayed aluminum to the designated location, wrap the paint with packaging film, and fix a paper cover on each corner with tape. When stacking, the paint should be facing the paint, back to back, to prevent damage to the paint.
