What are the quality control methods for aluminum veneers?

Aluminum veneer

The quality of aluminum veneers directly affects the quality of the entire curtain wall, so the quality control of the procurement of the plates is the key.

Aluminum veneers are generally made of pure aluminum. The thickness of the aluminum veneer commonly used for exterior walls is generally 2.5 to 3 mm. In order to strengthen the surface strength of the aluminum veneer, reinforcing ribs must be installed on the back of the aluminum plate, and the ribs are made of thick aluminum strips (the ribs of the plate are made of plates) The height is calculated at different heights. First, a screw cap is welded to the back of the aluminum plate by a flash welder, and then the aluminum strip for the rib is drilled into the screw and fixed by screws. The back side of the aluminum plate of the aluminum plate curtain wall should be reinforced. The reason is that under the condition of positive and negative pressure on the outside, the aluminum plate will not be sunken, and the second will not bulge, thus avoiding the vibration sound of the aluminum plate curtain wall repeatedly vibrating inside and outside.

If sound insulation is required, rock wool, slag wool or foaming treatment can be placed on the inside of the aluminum plate. Domestically produced aluminum plate manufacturers can produce a variety of wide and long, various curved shaped curtain wall aluminum plates according to user requirements, and weld the reinforcing ribs. The installation of the ribs is also very important. Some manufacturers' ribs are not connected to the hem of the aluminum plate, which destroys the force transmission effect of the reinforced shovel, which causes deformation of the slab after use and affects the façade effect.

In order to reduce the weight of the aluminum plate and increase the strength of the aluminum plate, the aluminum alloy plate used by us is often made of aluminum plate pressed by No. 21 rust-proof aluminum (code LF21) as the curtain wall aluminum plate. 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. Due to the relatively small composition of aluminum in the aluminum alloy plates used by individual manufacturers, the produced plates have rust or cracks, which seriously affect the quality. The synthetic composition of the board must meet the standards.

The surface treatment of the curtain wall aluminum plate can be divided into two methods, one is anodizing and the other is electrostatic spraying. The anodized oxide film is generally above 12μ, the color is only bronze and white, and the color is monotonous. The disadvantage is that the color of each aluminum plate surface is different. The overall effect of the curtain wall formed by many pieces of curtain wall panels is very ugly. This shortcoming can be said to be impossible to eliminate, not caused by production technology, but because the aluminum plate is not the same batch number, the chemical composition has a small difference, plus the current density of the electrolytic cell during oxidation can not be exactly the same, so after oxidation There are some differences in color. A single look may not be obvious, and it is very obvious if they are all arranged together. Therefore, the surface treatment of the aluminum plate of the aluminum curtain wall must not be anodized.

Another method of surface treatment of curtain wall aluminum panels is electrostatic spraying. Spraying is divided into powder spraying and liquid spraying. The powder spraying materials are mainly composed of polyurethane, bulging resin, epoxy resin and other raw materials with high color retention pigments, and dozens of different colors of spray powder can be obtained. The sprayed powder is resistant to impact and abrasion. Under the impact of 50 kg, the aluminum plate is deformed, and the sprayed layer has no cracks, no falling layer, intact, and is resistant to dilute acid and mortar. The only drawback is that it is afraid of long-term exposure to ultraviolet light. The spray powder produced by many domestic manufacturers has a very different weight. Some powders contain gold shavings. After the powder is hung on the wall, it changes with the angle of sunlight. There are changes during the day and dusk, and the color depth of the wall is different. , the use of powder spray paint should attract attention