Aluminum panel roll coating process

After degreasing and chemical treatment, the aluminum panel is roll‑coated with a high‑quality finish coat and then dried and cured. The surface smoothness of roll‑coated panels generally exceeds that of spray‑coated panels. Finishes are available in pearlescent or matte; pearlescent is more common on the market, though it comes at a higher price than spray coating. The standout feature of roll‑coated panels is their exceptionally realistic color reproduction. Quality can vary significantly depending on the process: for instance, a two‑coat, two‑roll application involves spraying once, baking once, then repeating the cycle to achieve a more even, smoother finish. High‑grade roll‑coated panels are quite expensive, offering lifelike colors and excellent durability. Imported fluorocarbon roll coating is another type of roll coating that incorporates fluorocarbon additives into the pigment formulation, enhancing color adhesion, extending service life, and providing superior resistance to acids, alkalis, and corrosion. It is often used for exterior cladding on high‑rise buildings—withstanding wind, rain, and other harsh environmental conditions—but its production costs are very high, making it the most premium category of roll‑coated panels. The surface‑treatment process for roll‑coated panels is as follows: they consist of a topcoat, an undercoat, and a back‑coating, with the back‑coat primarily serving to prevent oxidation and prolong service life. The workflow proceeds from semi‑finished product through machine application, forming, removal and inspection, to packaging and storage. The finished surface should be uniform, smooth, and free from obvious defects such as missed spots, pinholes, scratches, or flaking. Minor imperfections like bubbles, depressions, or inclusions are considered normal.