In recent years, the competition in the home appliance market has become increasingly fierce, and consumers have more and more personalized needs. In addition to competing for “hard work” in various product performance indicators, the appearance design has become another way for them to compete for market share. A key to victory. The composite material for the appearance of home appliances (commonly known as film-coated steel plates in the industry) by coating the film on the surface of the steel plate can provide a broader creative space for the appearance of home appliances because of its good colorability, formability and corrosion. It is being used more and more in the manufacture of home appliance shells.