Appearance quality requirements of aluminum profile: the surface of anodized profile is not allowed to have defects such as electric burn and oxide film falling off, which affect the use; After electrophoresis, powder and fluorocarbon profile painting, the paint film should be uniform, neat and smooth, and there should be no defects such as wrinkles, cracks, bubbles, flow marks, inclusions, paint film peeling, etc., but there should be no local film peeling within 80mm of the profile end. The appearance quality of aluminum alloy building profiles affects the architectural decoration effect, so the profile surface must be covered with film to avoid surface scratches, bumps and corrosion during transportation and stacking. Some aluminum alloy building profiles on the market also have similar water ripples and mildew spots, reflecting the defects in production technology.