Aluminum sheets used in buildings include single-layer aluminum sheets, composite aluminum sheets and other materials, often referred to as single-layer aluminum sheets (also known as single-layer aluminum sheets or pure aluminum sheets), mostly used in building decoration projects, in recent years in the use of single-layer aluminum curtain wall is more common. Aluminum plate curtain wall is also a form of curtain wall, simply speaking, using aluminum plate instead of glass curtain wall, aluminum plate curtain wall is mostly used for wall protection and lighting wall.
The aluminum sheet curtain walls abroad have been selected for single layer aluminum plates. Single layer aluminum plates are usually made of pure aluminum plates. Aluminum plate thickness is 3mm, in order to strengthen the strength of the aluminum plate, in the back of the aluminum plate, must install reinforcement ribs (existing manufacturers are uneasy), reinforcement ribs made of thick aluminum strip, first with flash welding machine to weld a screw cap on the back of the aluminum plate and then the reinforcement of the aluminum rod borehole into the screw, fixed with screws. In order to reduce the weight of aluminium plate and increase the strength of aluminium plate, we use aluminium alloy plate. Aluminum plate made of No. 21 rust-proof aluminium code LF21 is often used as curtain wall aluminium plate. The thickness of aluminum plate is reduced from 3mm to 2.5mm, which is twice as high as that of pure aluminum sheet. LF21 aluminum strip is used for reinforcing ribs. The width and thickness of the aluminum strip are determined by the surface of the aluminum plate. Generally, the thickness is 2-2.5mm and the width is 10-25mm. The reason why the back of aluminum curtain wall should be strengthened is that under the positive and negative external pressure, the aluminum plate will not be sunken, two will not bulge, thus avoiding the aluminum curtain wall repeated inside and outside vibration and the vibration sound. If sound insulation is needed, the rock can be placed on the inside of the aluminum sheet, with rock wool, slag wool or foam treatment.
Curtain wall aluminum surface treatment can be divided into two methods, one is anodic oxidation, the other is electrostatic spraying. Anodized oxide film is generally more than 12 mu, the color is only bronze and white, the color is monotonous, the more serious drawback is that the color of each aluminum plate surface is different, many curtain wall panels together to form a curtain wall overall effect is very ugly. This disadvantage can not be eliminated, not due to production technology, but because the aluminum plate is not a batch number, chemical composition, there are small differences, coupled with oxidation when the electrolyte current density and other factors can not be completely the same, so the number of colors after oxidation are different, a single look may not be obvious, if all are That is very obvious. Therefore, the surface treatment of aluminum plate curtain wall must not be anodized.
Another way of surface treatment of aluminum curtain wall is electrostatic spraying. Spraying is divided into powder spray and liquid spray. Powder spraying materials are mainly polyurethane, swelling resin, epoxy resin and other raw materials with high color retention pigments, can get dozens of different colors of spraying powder. The spraying powder, collision resistance and abrasion resistance, 50 kg impact, aluminum plate deformation, spray coating without cracks, no drop layer integrity and no damage, dilute acid and mortar. The only shortcoming is that the long term exposure to ultraviolet radiation will lead to differences in color between yin and Yang after a few years.
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