Introduction of aluminum curtain wall and surface treatment process
[China Aluminum Industry Network] Aluminum plates are plate-type materials made of aluminum or aluminum alloy materials. Or it is a plate type aluminum product made from flat aluminum embryos heated, rolled and straightened or solution heat aged. Stamping Parts,Metal Stamping Part,Local Steel Metal Stamping,Plate Parts JIANGSU TONGDE INTERNATIONAL TRADE CO.LTD. , https://www.jstongdetrade.com
The aluminum plates used in construction include single-layer aluminum plates, composite aluminum plates, and other materials. Generally, they are often referred to as single-layer aluminum plates (also known as single aluminum plates or pure aluminum plates) and are used in building decoration projects. In recent years, aluminum plates used in aluminum plate curtain walls have been used. The more common. The aluminum curtain wall is also a form of curtain wall. Simply put, the curtain wall is made of aluminum instead of glass, and the aluminum curtain wall is mostly used for wall protection and non-lighting walls. Such as the Guangzhou World Trade Center, it used the southwest aluminum processing plant plate factory processing different arcs of aluminum plate nearly 150 tons, the surface using electrostatic spraying.
Foreign aluminum curtain wall has been used single aluminum. Single aluminum plate is generally used pure aluminum plate. Aluminum plate thickness of 3mm, in order to strengthen the strength of aluminum plate surface, in the back of the aluminum plate, must install ribs (the existing manufacturers uneasy), reinforced with thick aluminum ribbon made, first with a flash welder to one screw cap Welded on the back of the aluminum plate and then insert the aluminum bar for the reinforcement into the screw and fix it with screws. In order to reduce the weight of aluminum plates and increase the strength of aluminum plates, we use aluminum alloy plates, often using aluminum plates pressed with No.21 rust-proof aluminum code LF21 as curtain wall aluminum plates. The thickness of the aluminum plate is reduced from the original 3mm to 2.5mm, and the strength of the alloy is about twice as high as that of the pure aluminum plate. The ribs are made of LF21 aluminium strip. The width and thickness of the aluminium strip are determined according to the surface of the aluminum plate. It is generally 2-2.5mm thick and 10-25mm wide. Why do we have to strengthen the ribs on the back side of the aluminum plate in the aluminum curtain wall? Under the condition of external positive and negative pressure, the aluminum plate will not sag, and the second will not bulge out. This avoids the vibration sound of the aluminum plate curtain wall vibrating repeatedly inside and outside. If sound insulation is required, rock wool, slag wool, or foaming can be placed inside the aluminum plate. In China, the former aluminum sheet manufacturers that produce aluminum curtain walls, and the southwest aluminum deep processing factory in Chongqing, which is a military manufacturer, can produce aluminum sheets with a width of up to 2.8 meters.
Curtain wall aluminum surface treatment can be divided into two methods, one is anodizing, and the other is electrostatic spraying. Anodized oxide film is generally more than 12μ, the color is only bronze and white, the color is monotonous, the more serious drawback is the color of each aluminum plate surface shades are different, many pieces of curtain wall plate together to form a curtain wall overall effect Very ugly. This disadvantage can be said to be impossible to eliminate, not because of the production technology, but because the aluminum plate is not a batch number, chemical composition, there are small differences, plus the electrolytic tank current density and other factors can not be exactly the same, so The number of colors after oxidation is different, and the single leaflets may not be obvious. Therefore, aluminum surface treatment of aluminum curtain walls must not be anodized.
Another method of surface treatment of curtain wall aluminum is electrostatic spraying. Spraying is divided into powder spraying and liquid spraying. Powder spray material is mainly: Polyurethane, poly swell resin, epoxy resin and other raw materials with high color retention pigments, can get dozens of different colors of spray powder. The spray powder, resistant to impact wear rub, under the impact of 50 kg, aluminum deformation, spray coating without cracks, no loss of intact layer, anti-dilution acid and mortar. The shortcomings of long-term exposure to UV rays, easy to produce a few years later the difference in the color of the yin and yang. Spray powder produced by many domestic manufacturers, the weight difference is very large, and some powder containing gold shavings after the powder hanging on the wall, with the sun angle changes, day and evening changes, the wall color shades are different, The use of powder spray coating has attracted attention.