Aluminum profiles is the most widely used non-ferrous structural material, good appearance, lightweight, high intensity, corrosion resistance, dust prevention, easy cleaning, and durable, widely used in the aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, decoration and chemical industry. In the clean room system, special aluminum alloy profiles are used to make the maintenance structures such as panels, doors and windows form an effective fixture and connection, especially in each corner to form a circular transition to meet the special requirements of the clean room.