The quality of pre-coated color galvanized steel sheets depends on precise continuous production processes, with the mainstream being two-coat two-bake production lines. The entire process starts with uncoiling, followed by substrate head cutting, stitching, and deburring. Then, alkaline degreasing is performed to thoroughly remove surface oil and impurities, laying the foundation for subsequent treatments.

The pretreatment stage is crucial. After phosphating or surface conditioning, the substrate undergoes water washing and squeezing, followed by passivation treatment. This significantly enhances coating adhesion and prevents later peeling. The coating process uses roll coating: first, the primer is applied and cured by baking at 250-400°C for 20-60 seconds. After cooling, the topcoat is applied and baked repeatedly. Some products may also include embossing, printing, or waxing processes. Finally, the production is completed through flattening and coiling. Throughout the process, paint viscosity and curing rate must be controlled to avoid defects such as blistering and pinholes. This continuous production not only ensures product consistency but also enables large-scale mass production to meet the batch requirements of different industries.