Laminated steel sheet (VCM) is a multi-layer composite steel sheet with a treatment and bonding paint layer and a polymer film topcoat applied to the top surface. The polymer film can be single-layer or multi-layer. A paint layer and treatment can be applied to the bottom surface. It has several series: high-gloss, matte (low-gloss), wood grain, floral patterns, etc. The film has better corrosion resistance, and the image is elegant and clean. Therefore, it has become one of the most popular household appliances and indoor building materials.