What is aluminum curtain wall?

The aluminum veneer curtain wall is made of high-quality high-strength aluminum alloy plate, its common thickness is 1.5, 2.0, 2.5, 3.0mm(1/8 inch aluminum sheet), the alloy type is 1000 3000 5000 6000 series aluminum plate, 3003-H24 is especially common;

Aluminum curtain wall

Curtain wall aluminum panels are mainly composed of panels, ribs and corners. The corner code can be directly bent and stamped from the panel, or it can be formed by riveting the corner code on the small side of the panel. The reinforcing rib is connected with the electric welding screw behind the panel (the screw is directly welded on the back of the panel) to make it a solid whole, which greatly enhances the strength and rigidity of the aluminum veneer curtain wall and ensures the flatness in long-term use. degree and wind and earthquake resistance. If sound insulation and heat insulation are required, efficient sound insulation and heat insulation materials can be installed on the inside of the aluminum plate.

Aluminum curtain wall structure

Aluminum veneers are divided into two types in terms of specifications: aluminum veneers with a thickness of less than 1.2 mm are called aluminum buckle plates (also called aluminum square plates), and aluminum veneers with a thickness of more than 1.5 mm are called aluminum veneers (also called aluminum square plates) aluminum curtain wall).

Classification of aluminum curtain wall

As far as the currently used aluminum curtain walls are concerned, most of them are composite aluminum panels and aluminum alloy veneers.

The composite aluminum plate is made of two layers of 0.5mm pure aluminum plate inside and outside (0.2-0.25mm for indoor use), and the middle layer is made of polyethylene (PE or polyvinyl chloride PVC) with a thickness of 3-4mm. Flat plate, such as 4×8 aluminum sheet (1220mm×2440mm). The fluorocarbon paint on the surface of the composite aluminum plate for external use is also completed by roller coating, rolling and heat sealing at one time. The thickness of the coating is generally about 20 μm. The advantages of the composite aluminum plate are light weight, smooth surface, good flatness, and the same direction It has no color difference and has excellent on-site processability, which provides conditions for dealing with the size change of the outer wall caused by the on-site construction error, reducing the processing cycle of the workshop and shortening the installation period.

Composite aluminum plate

The aluminum alloy veneer is generally 2~4mm aluminum alloy plate. When it is made into a wall panel, the sheet metal processing is carried out according to the requirements of the secondary design, and the edge is directly folded. The four corners are welded into a close groove by high pressure. The wall panel The fixing bolts for the reinforcing ribs are reserved on the back by means of electric welding nails. After the sheet metal work is completed, the fluorocarbon paint is sprayed. Generally, there are two coats and three coats, and the thickness of the paint film is 30-40μm. The aluminum alloy veneer is easy to process into arcs and multiple folded edges or sharp angles, which can meet the needs of today’s ever-changing exterior wall decoration, and it is rich in colors, which can be arbitrarily selected according to the design and the owner’s requirements, which truly broadens the scope of architects. their design space.

Aluminum veneer curtain wall

Aluminum curtain wall Features:

• 1. Aluminum curtain wall has good rigidity, light weight and high strength. The aluminum veneer curtain wall panel has good corrosion resistance, and the fluorocarbon paint can last for 25 years without fading.
• 2. The aluminum curtain wall has good craftsmanship. Using the process of painting after processing, the aluminum plate can be processed into various complex geometric shapes such as plane, arc and spherical surfaces.
• 3. The aluminum curtain wall is not easy to stain, easy to clean and maintain. The non-adhesiveness of the fluorine coating film makes it difficult for pollutants to adhere to the surface, and it has good cleanliness.
• 4. The installation and construction of aluminum curtain wall is convenient and quick. The aluminum plate is formed in the factory, and the construction site does not need to be cut but simply fixed.
• 5. The aluminum curtain wall can be recycled and reused, which is beneficial to environmental protection. Aluminum plate can be 100% recycled, and the recycling value is higher.

Aluminum sheet for aluminum curtain wall

Aluminum curtain wall has unique texture, rich and long-lasting color, and can be diversified in appearance and shape, and can be perfectly combined with glass curtain wall materials and stone curtain wall materials. Its perfect appearance and excellent quality make it favored by owners. Its light weight is only one-fifth of marble and one-third of glass curtain wall, which greatly reduces the load of building structure and foundation, and the maintenance cost Low, high performance-price ratio.

Parameters of aluminum curtain wall

Aluminum curtain wall surface treatment process

Fluorocarbon resin spraying

The surface of the aluminum curtain wall is generally treated with chromium and other pre-treatments, and then treated with fluorocarbon spraying (PVDF). Polyvinylidene fluoride resin (KANAR500) for fluorocarbon paint topcoats and varnishes. Generally divided into two coatings, three coatings or four coatings.

Aluminum coil for aluminum curtain wall

Fluorocarbon coating has excellent corrosion resistance and weather resistance, can resist acid rain, salt spray and various air pollutants, has excellent cold and heat resistance, can resist strong ultraviolet radiation, and can maintain long-term non-fading and non-chalking ,long lasting.
Huawei Aluminum selects high-quality fluorocarbon coatings from world-renowned fluorocarbon coating manufacturers such as PPG, DNT, AKZO, and NIPPON. It has a wide range of color options. Customers can directly choose according to the color swatches provided by the manufacturer or provide swatch samples.

Anodizing

The anodized oxide film is generally above 12μ, and the colors are only bronze and white. The color is monotonous. The more serious disadvantage is that the color of each aluminum plate is different. Very ugly.

This shortcoming can not be eliminated, it is not caused by the production technology, but because the aluminum plate is not made of a batch number, there are small differences in chemical composition, and factors such as the current density of the electrolytic bath during oxidation cannot be exactly the same, so There are some differences in the color after oxidation, which may not be obvious when viewed individually, but 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.

Electrostatic spraying

Another method of aluminum curtain wall surface treatment is electrostatic spraying. Spraying is divided into powder spraying and liquid spraying. Powder coating materials are mainly polyurethane, expansion resin, epoxy resin and other raw materials combined with high color retention pigments, and dozens of spray powders of different colors can be obtained. The sprayed powder is impact-resistant and wear-resistant. Under the impact of 50kg, the aluminum plate is deformed, and the sprayed coating has no cracks, no peeling, intact, resistant to dilute acid, and resistant to mortar.

The only disadvantage is that it is afraid of long-term exposure to ultraviolet rays, and it is easy to produce yin and yang color difference after a few years.

Aluminum Curtain Wall Market Trend

• • First, the total aluminum curtain wall market will continue to maintain a steady growth trend.

At present, the construction industry has become a hot spot of consumption and a point of economic growth, and the demand is gradually increasing. Driven by the Beijing Olympic Games, Shanghai World Expo, Guangzhou Asian Games, Western Development, revitalization of Northeast China, urban renovation and new city construction in various places, the total aluminum curtain wall market will continue to grow.

Aluminum sheets for building exterior walls

• • Second, form a market structure dominated by large enterprises and assisted by small and medium-sized enterprises.

At present, the aluminum curtain wall industry has formed a technological innovation system with more than 100 large-scale enterprises as the main body and more than 50 backbone enterprises with an output value of over 100 million yuan. The industrial output value completed by these large-scale backbone enterprises accounts for about 50% of the total industrial output value of the whole industry. A good market image has become the main force of technological innovation, brand excellence and market development in the whole industry.

• • Third, due to the impact of energy-saving policies, the product structure of domestic aluminum curtain wall will undergo major changes.

Aluminum alloy curtain walls are still dominated by exposed frames, hidden frames, and aluminum panel curtain walls. Unitized curtain walls have good development prospects in large and medium-sized cities. Aluminum double-layer, intelligent, and sunshade curtain walls will gradually mature and improve. The market share of aluminum panel curtain wall in the building curtain wall market will remain above 55%, and the product structure will undergo major changes. Affected by the national building energy-saving policy and the energy crisis, the proportion of energy-saving and environmentally friendly aluminum curtain walls will be greatly increased.

• Fourth, environmental protection and energy saving will become the theme of the development of aluminum curtain wall enterprises.

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