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Aluminum veneer and the difference between aluminum plate
First, the difference between aluminum veneer and aluminum-plastic panels
Aluminum veneer is the use of high-quality aluminum alloy sheet as the substrate, and then through CNC bending and other technical molding, decorative coating surface spraying a new type of curtain wall materials.
Aluminum-plastic composite board is chemically treated coating aluminum surface material, with polyethylene plastic as the core material, in the special aluminum-plastic sheet processing equipment and processing of composite materials. The unique properties of APCP itself determine its wide range of uses: it can be used in building facades, curtain wall panels, renovation of old buildings, interior wall and ceiling decoration, advertising signs, display stands, dust purification engineering. Aluminum-plastic composite panels have been widely used in China, belonging to a new type of architectural decoration materials.
Is a curtain wall application has been for decades, is still in use, including aluminum veneer, aluminum-plastic composite panels and aluminum honeycomb panels three. Of the three materials, aluminum veneer and aluminum-plastic panels are the most commonly used. Aluminum veneer appeared first, and later in the late 1960s and early 1970s, APCP was invented in Germany, and quickly became popular around the world. Aluminum and aluminum veneer in the end what is the difference? Here I will do a simple comparison of these two materials: First, the material and cost Aluminum veneer generally use 2-4mm thick AA1100 pure aluminum or AA3003 aluminum alloy plate, the domestic general use 2.5mm thick AA3003 aluminum alloy plate ; APCP generally use 3-4mm three-tier structure, including the upper and lower two 0.5mm sandwich PVC or PE. We can see from the material, the cost of APCP must be much lower than the aluminum veneer. The current market is about 4mm thick composite board to 2.5mm thick than the price lower than 120 yuan / square, a 10,000 square project, the use of aluminum-plastic panels than the use of aluminum veneer to reduce the cost of 1,200,000 yuan .
Second, the process
At present, there are two kinds of fluorocarbon spraying aluminum veneer and roller coating on the aluminum veneer in the world. There is no stick coating production line in China for the time being, so the processing of veneer here mainly refers to the fluorocarbon spraying production. Spraying aluminum veneer production is divided into two steps: The first step is sheet metal processing. This process is mainly through the plate after cutting, folding, bending, welding, grinding and other processes, the aluminum veneer processed into the required shape and size of construction. The second step is to spray. Spraying is in the processing of the sheet metal spray paint. Spraying is divided into two kinds, one is artificial spraying, one is machine spraying. Machine coating generally only suitable for the rules of the flat, but this aluminum veneer used in the actual use of less, most of the domestic manufacturers using artificial spraying. Artificial spraying is a dangerous job, because the paint is volatile and toxic are relatively strong, it is likely to cause chronic benzene poisoning, seriously affecting human health. One of the great advantages of artificial spraying is that regardless of the amount of size, color can be optional, and the aluminum-plastic coated roller must reach a certain amount before it can be processed. The processing of aluminum plate is more complicated than the aluminum veneer, there are four major processes of chemical formation, painting, compounding and trimming. These four processes are all automated production besides trimming. As can be seen from its processing, aluminum-plastic panels in the environmental and safety aspects have a certain superiority. Coupled with the simple process of sheet metal plus aluminum veneer, some private workshops have begun to set foot in, seriously affecting the quality of aluminum veneer market stability.
Third, the appearance of the product quality and physical properties
Project 2.5mm aluminum veneer 4mm thick aluminum-plastic composite panel appearance quality flatness is not flat, it looks partial bump, flatness is relatively high, but the processing of limited shape; but can be processed into a variety of irregular shapes; Spray roller coating eye quality quality, color and film thickness deviation due to the instability of artificial technology, there is no obvious local color difference, but the damage can not be repaired. And film thickness deviation; local damage can be repaired. Tensile strength 130 / mm 38-61N / mm2X Elongation 5% -10% 12% -17% Bending strength 84.2N / mm 34N / mm2 Elastic modulus 70.00N / mm2 26.136-49.050N / mm2 From the table above Can be seen that the appearance of aluminum veneer worse than aluminum, but its mechanical properties significantly better than the aluminum-plastic panels, its wind pressure performance is also better than the aluminum-plastic panels. However, most of our country, the wind pressure value of aluminum plate is completely affordable, so the use of aluminum veneer project a bit overkill.
Fourth, the construction process
Aluminum and aluminum veneer construction process is generally the same. The biggest is not aluminum-plastic plate is processed into the desired shape and size at the site, with greater freedom of construction. The aluminum veneer processing is formed in the factory, due to the accuracy of domestic equipment, often in the construction process will encounter some minor problems. In addition, during the delivery of the construction process, the mass production of APCP is much faster than the production of aluminum veneer, and the schedule guarantee system is also higher.
Fifth, other aspects of the comparison
1, lightning protection features
This issue has been debated for a long time, people really think that aluminum veneer is pure aluminum, conductive performance better. In response to this problem, the German ALUSUISSESINGEN GMBH company in Munich, Germany, a military laboratory made two kinds of materials anti-lightning experiments. The results show that when the lightning strikes instantaneously, the current curtain wall connection method, whether aluminum or aluminum veneer, can completely prevent lightning; when the lightning strikes the continuous current, the metal plate or the metal surface layer Lightning Department is prone to melting. The aluminum-plastic composite panels due to the middle of the polyethylene core of the good insulation, lightning damage is limited to the epidermis, from this perspective, aluminum-plastic composite panels than the aluminum veneer has a better anti-lightning performance.
2, fire characteristics
Aluminum veneer is not burning, it is we all know. Early aluminum-plastic panels are not fireproof but with the development of aluminum-plastic panel technology, fireproof aluminum-plastic composite panels are now available due to its non-toxic flame retardant PE materials, fire performance greatly improved, it is entirely possible Meet the needs of engineering fire.
3, residual value
Aluminum veneer has a certain residual value, but due to its high cost, the waste caused by it is still much larger than the aluminum-plastic composite veneer with almost no residual value. In summary of the above analysis, aluminum veneer and aluminum-plastic composite panels have their own advantages, but from a large perspective, the application of aluminum-plastic panels should be more affordable and environmentally friendly.