Flat polishing: Flat polishing groove can not only transform into a certain wall thickness oxide film, but also greatly improve the full chroma of aluminum alloy. Because the anodic oxidation of aluminum alloy profile after sand curvature polishing solution, the first flat polishing solution, surface light produces a layer of high density oxidation layer, the glossiness is fixed, and then the anodic oxidation, greatly reduce the loss of light; In addition, from the sand surface polishing to aluminum alloy profile anodic oxidation, multi-channel water cleaning, and may have air or water cleaning tank, cause galvanic corrosion, if the first flat polishing groove, prefabricated a certain wall thickness of oxide film, organic chemistry is preferred to maintain, to prevent oxidation cause galvanic corrosion in the water tank before or cut flowers, Industrial aluminum profile manufacturers to improve the yield. Fine dust removal: acid etching ash is difficult to remove, the general way is difficult to eliminate. It will seriously affect the appearance quality of acid etched materials. Although sand grooves eliminate the vast majority of acid ash, manufacturers of aluminum profiles are likely to have small residuals under some unique standards. Flat polishing tank can quickly clean acid etching ash, so as to ensure the quality of aluminum alloy profiles, and completely avoid the environmental pollution of acid etching ash to the color tank and electrophoresis tank.