The selection of color-coated sheets primarily involves choosing appropriate mechanical properties, substrate type (coating type), coating weight, as well as the performance characteristics of both the topcoat and the backcoat. Key factors to consider during material selection include intended application, environmental corrosivity, service life, durability, processing methods, and the degree of deformation required.
Mechanical properties are selected primarily based on factors such as the intended application, processing methods, and the extent of deformation involved. The substrate type (coating type) and coating weight are selected primarily based on factors such as the intended application, environmental corrosivity, service life, and durability.
The selection of topcoat performance characteristics focuses on factors such as paint type, coating thickness, color difference, gloss, hardness, flexibility/adhesion, durability, and other specific properties. Commonly used topcoats include polyester, silicon-modified polyester, high-durability polyester, and polyvinylidene fluoride (PVDF). Common primers include epoxy, polyester, and polyurethane. Coating thickness is closely correlated with corrosion resistance.
During processing, forming operations must be conducted under the strict premise of ensuring the integrity of the coating remains intact. Processing considerations include accounting for mechanical properties, utilizing multi-pass forming techniques, setting appropriate clearances, using lubricants, avoiding processing in low-temperature environments, protecting cut edges, minimizing burrs, and maintaining smooth contact surfaces.
For storage, the material should be kept in a dry, well-ventilated indoor environment; outdoor storage should be strictly avoided. The floor of the storage area must be level and free of hard objects. Horizontally oriented steel coils should be placed on rubber mats, wooden blocks, cradles, or similar support devices. Since the mechanical properties and certain coating characteristics of color-coated sheets may change over prolonged storage periods, users are advised to process the material as soon as possible. During transportation, products should be shipped in their original factory-packed condition; the original packaging must not be arbitrarily dismantled. During loading and unloading operations, rubber mats or protective padding should be placed between lifting gear and the product to prevent surface damage or bruising. The cargo compartment of the transport vehicle must be thoroughly cleaned, and the vehicle bed should be lined with rubber mats or other protective materials.