Metal board curtain wall applications have a history of decades. It is still using three types: aluminum veneer, aluminum -plastic composite board and aluminum honeycomb board. Among these three materials, the most commonly used is aluminum veneer and aluminum -plastic board. The earliest appeared on aluminum veneers. Later, in the late 1960s and early 1970s, aluminum -plastic composite boards were invented in Germany and quickly became popular all over the world.
What is the difference between aluminum -plastic and aluminum veneer? Here I make a simple comparison of these two materials: First, the material and cost aluminum veneer generally uses 2-4mm thick AA1100 pure aluminum board or AA3003 aluminum alloy board. ; Aluminum -plastic composite plates are generally a 3-4mm three -layer structure, including two up and down 0.5mm with PVC or PE. From the materials, we can see that the cost of aluminum -plastic composite boards is definitely lower than that of aluminum veneer. The current market is about 4mm thick composite plates lower than 2.5mm. The price is more than 120 yuan / square meter. A 10,000 -square -meter project, the use of aluminum plastic boards will reduce the cost of 1.2 million yuan than the aluminum veneer. Essence
2. The processing process currently has two types of aluminum veneer in the world: fluorocarbon spraying aluminum veneer and roller coating. There is no stick coating production line in China for the time being. Spray production aluminum veneer is divided into two steps: the first step is sheet metal processing. This process is mainly to process the tablet to process the shape and size of the construction by cutting, folding, curved arcs, welding, polishing and other processes.
The second step is spraying. Spray is spray paint on the processed sheet metal. Two types are divided into two types, one is artificial spraying, and the other is machine spraying.
Machine spraying is generally only suitable for rules, but this aluminum veneer is relatively small in actual use, and most of the domestic manufacturers use artificial spraying. Artificial spraying is a dangerous job, because the volatility and toxicity of the paint are relatively strong, and it is easy to cause chronic benzene series poisoning, which seriously affects human health. A major advantage of artificial spraying is that regardless of the size, the color can be selected, and the roller coating of the aluminum -plastic plate must be achieved to be processed.
The processing process of aluminum -plastic plates is more complicated than the aluminum veneer. It mainly has four major processes of turning, painting, composite and repairing edges. These four processes except for repair are automated production. It can be seen from its processing process that aluminum -plastic boards have a certain advantage in environmental protection and safety. Coupled with the simple process of sheet metal in the aluminum veneer, some private workshops have also begun to get involved, which seriously affects the stability of the market quality of aluminum veneer.
Third, the appearance quality and physical performance of the product project 2.5mm aluminum veneer 4mm thick aluminum -plastic composite plate, the appearance quality of the tablet is not high, it looks local bump, the flat flatness is relatively high, but the processing type is limited; It can be processed into various irregular shapes; spray roller coating quality is good in quality. Due to the unstable artificial technology, the local color difference is not obvious due to the instability of the artificial technology, but the damage cannot be repaired locally. Deep deviation from the membrane; local damage can be repaired. Play tensile strength 130/mm 38-61n/mm2x extension length 5% -10% 12% -17% sexual bending strength 84.2N/mm 34N/mm2 Elastic modulus 70.00N/mm2 26.136-49.050n/mm2 It can be seen from the table above that the appearance of aluminum veneer is worse than that of aluminum -plastic plates, but its mechanical properties are significantly better than aluminum -plastic plates, and its wind pressure performance is also better than aluminum -plastic plates.
However, in most parts of my country, its wind pressure aluminum plastic board is completely tolerated. Therefore, the project is a bit large and small. Fourth, the construction process of aluminum plastic boards and aluminum veneer in the construction process is generally the same. The biggest is not the shape and specifications of the aluminum -plastic board in the construction site, and it has a large degree of construction freedom.
The aluminum veneer is processed by Chinese manufacturers. Due to the accuracy of domestic equipment, some small troubles often encounter some small troubles during the construction process. In addition, in terms of the delivery period of the construction process, the mass production of aluminum -plastic composite boards is much faster than the production of aluminum veneer, and the construction progress guarantee system is also higher. V. Comparison of other aspects 1. The problem of lightning protection has been arguing for a long time. People really think that the aluminum veneer is pure aluminum, and the conductive performance is better.
In response to this problem, Germany's AlusueSesingen GMBH conducted two materials for anti -lightning experiments in a military laboratory in Munich, Germany. The results show that during the instant impact of lightning strikes, the curtain wall connection method currently adopted, whether it is aluminum -plastic panel or aluminum veneer, can completely prevent lightning strikes; when the lightning strike continues current, It is easy to dissolve at the lightning strike. Due to the good insulation of the intermediate polyethylene core layer, the damage of lightning strikes is limited to the epidermis. From this perspective, aluminum plastic composite board has better anti -lightning strike performance than aluminum veneer.
2. Fire -resistant aluminum veneer is not burned, this is everyone knows. Early aluminum -plastic boards were unable to fire, but with the forward development of aluminum -plastic plate technology, the fire -resistant aluminum -plastic composite plate produced now is greatly improved. Meet the needs of engineering fire protection. 3. The residual aluminum veneer has a certain amount of residual value, but due to its expensive cost, it is much larger than the aluminum -plastic composite board with almost no residual value.
In summary, aluminum veneer and aluminum -plastic composite plates have their own advantages, but from a large perspective, the application of aluminum -plastic plates should appear more affordable to environmental protection.