The stamping process uses the principle of hot pressing transfer to transfer the aluminum layer in the anodized aluminum to the substrate surface to form a special metal effect. Since the main material used for stamping is anodized aluminum foil, the stamping is also called anodized stamping. Electrochemical aluminum foil is usually composed of multi-layer materials, and the base material is usually PE, followed by separation coating, color coating, metal coating (aluminum plating) and glue coating.