The production of color-coated board adopts two-coating and two-baking production process. In order to ensure the coating quality of color-coated products and the quotation of color-coated boards, it is necessary to carry out pre-treatment work such as degreasing, dust removal, and rust removal on the surface of the substrate before coating. Basic work for the quality of coated products. The purpose of the treatment is to chemically coat the clean substrate surface after removing the anti-rust oil, rust spots, dust, etc. attached to the surface of the substrate to form a network chemical conversion film with Cr6+ and Cr3+ as the basic skeleton. Increase the adhesion between the substrate and the coating, improve the corrosion resistance of the substrate and the durability of the coating. The quality of the work determines the quality of the coating, and directly affects the physical indicators such as the flexibility and impact resistance of the coating. Determines the coating adhesion of color-coated board products. The purpose of initial coating, finishing coating and curing is to coat the coating on the substrate surface and use heating to volatilize the organic solvent of the coating, so that the organic coating and the substrate are closely combined.
The product quality of the color-coated sheet is not only determined by the basic properties of the substrate and coating, but also by the production process and operation control technology. Operation control technology has a great impact on the physical properties and surface quality of color-coated board products. From the production process analysis, the key points of production control technology should include cleaning treatment, chemical coating treatment, coating (including initial coating, fine coating), curing 4 links .
