[China Aluminum Network] Ten years ago, we could only see or browse in the media to overseas buildings with modern and discreet decorative materials—aluminum-plastic composite panels. Today we walk in the metropolis or in small towns. It will be attracted by a variety of colorful aluminum plate projects. This material not only has the effect of a metal curtain wall, but it is also superior to the metal curtain wall in that it has a light texture and is easy to be bended in the field to make various shapes. The shopfronts, schools, hospitals, and institutions around them are magnificent and noble and elegant due to the adoption of aluminum-plastic composite panels. Some people may mistakenly believe that aluminum-plastic panels are used for exterior wall decoration, and their advantages of using aluminum-plastic composite panels for interior decoration are inferior to traditional building materials. In fact, the superiority of aluminum-plastic composite panels is not only so. As we all know, granite is an ideal decorative material but it is rejected because of its heavy texture or expensive price. Nowadays, we have provided surface-coated colors and marble, granite-like aluminum-plastic panels that are easy to install.
In recent years, with the rapid development of the economy, the decoration standards of construction units have also risen. Some newer building facades are becoming more and more popular with some high-end decoration materials. It seems that without a curtain wall, it is not enough to show its level. A few years ago, it was popular glass and natural stone curtain walls, followed by composite aluminum curtain walls, but also popular.
At present, it is mainly used in some public buildings, and there are also a few local residential areas that use high-end routes. Because the use of composite aluminum panels for curtain wall decoration of high-rise buildings has always been disagreeable, composite aluminum panels have become a new hot topic in the industry since their inception. One opinion is that composite aluminum curtain walls should be used sparingly or with caution. High-rise buildings using composite aluminum panels (that is, aluminum-plastic panels) as curtain walls will become "air killers" or "invisible killers," potentially dangerous.
There are four shortcomings:
First, the structure of the composite aluminum plate is generally three layers, and the outer sides are 0.1-0.3 thick aluminum layers. The middle sandwich material is mainly made of low- and medium-pressure polyethylene (high-density polyethylene) and other polymer materials. Tree vinegar glue adhesive, core material and glue contain toxic components, and fire, weather resistance, durability, anti-aging and other properties are poor, in the burning or high temperature, even in the sun exposure will release toxic gases harmful to human health ;
Second, the composite strength is not high, easy to break when the curved corner surface, when the local heating, the core material will expand and cause the surface aluminum plate deformation and shedding, and its thermal expansion coefficient is generally larger than the keel and the building, often the sudden emergence of drum phenomenon and affect Beautiful
Thirdly, lightning protection devices are generally shared with the main body of the building during installation, and the composite aluminum core material and fasteners are poor conductors of electricity. The current cannot pass quickly and is vulnerable to high-voltage lightning strikes.
Fourth, due to the strength of the material itself, its strength against wind pressure is not high. At present, high-rise buildings in foreign advanced countries have rarely adopted composite aluminum panels for curtain walls, instead switching to single-layer aluminum panels with relatively high safety and reliability.
Another opinion is that the composite aluminum panel is characterized by light weight, appropriate steel, shock absorption and sound insulation, and its decorative effect is good, and its surface can be used for secondary processing such as anti-corrosion, embossing, painting, printing, etc. Compared with aluminum plates, the cost is much lower. People who support this view believe that after years of development, the composite aluminum sheet has gradually matured in technology, and the materials are generally subjected to processing such as corrosion resistance, weather resistance, crash resistance, bending resistance, and pressure resistance before being shipped out of the factory. There is a certain degree of safety in use. And reliability. The use of composite aluminum panels as curtain walls in high-rise buildings, despite the high requirements for wind pressure resistance, the magnitude of compressive strength is not only related to the quality of the wall materials themselves, but also relates to the installation size specifications, the aspect ratio of the plates and the configuration of the keel. The degree of confidentiality and so on. If the requirements of the construction specification are strictly followed, the composite aluminum panels that are generally in compliance with the quality indicators can be used as curtain walls for high-rise buildings. In addition, the current technologies and measures for lightning protection have been relatively mature. High-rise buildings are generally considered in this respect. As for composite aluminum curtain walls damaged by lightning strikes, they are extremely rare in practical applications and have not been found at home and abroad. Any precedent. Therefore, it can be widely used for exterior wall decoration of high-rise buildings.
At present, it is still more difficult to completely reconstruct the aluminum curtain wall and the non-industrial sector because "the public said that the public has reason, and the woman said that her husband is reasonable" and they did not give up. However, the general public, composite aluminum sheet manufacturers, and owners of high-rise buildings all hope that they can give a compound aluminum curtain wall a plausible argument because citizens and owners are more concerned with the safety of use, and companies are concerned about the product market. China's aluminum-plastic composite panel production began in the 1990s and has since grown rapidly. In a few short years, aluminum-plastic composite panels have become China's third largest curtain wall decoration material after stone and glass. At present, China has become a country with a large amount of global use and exports, with an annual output of 200 million square meters and an output value of nearly 20 billion yuan. However, the counterfeit and shoddy industry has caused the aluminum-plastic composite panel industry to face the scourge. The standard aluminum-plastic panel is divided into two types: the inner wall and the outer wall, and the inner wall is composed of two layers of 0.12 mm aluminum plate and household VC. The thickness of the aluminum-plastic composite plate on the outer wall should reach 4 mm and consist of two layers. 5mm aluminum plate and 3mm corpse VC material, paint surface should use anti-aging fluorocarbon paint. But now many products on the market aluminum plate only. 005 mm thick, core material used in plastic even have garbage. According to international standards, the reasonable price of aluminum-plastic composite panels for external walls is between 200 and 220 yuan per square meter, but the lower prices in the market have already sold for 61 yuan per square meter. Low-priced products with poor product quality have seriously affected the reputation of aluminum-plastic composite panels, causing some experts to lose confidence in them, and their use has been opposed by some people.
As far as designers are concerned, in addition to guaranteeing the safety of their use, composite aluminum curtain walls are mainly considered in terms of architectural modeling and post-construction maintenance. Because of its large area, strong plasticity, excellent manufacturing process, and a metallic glass texture, it has a modern feel and a wide selection of color varieties. Therefore, it can better reflect the designer's design ideas. one. However, the materials we usually use are usually older and change with time, or are difficult to clean after being dirty. These all undoubtedly increased the difficulty of maintenance and made it look old after three to five years. The advantage of easy cleaning of the curtain wall is the second reason why designers are willing to use aluminum curtain walls. However, high-rise or super high-rise buildings use aluminum curtain walls. I think we should be extremely careful. Because on the front, the high-rise building usually has a large area of ​​external walls, and the investment involved is large. If it is not used well, the waste caused is also large. Second, most of the high-level are far away from the ground. Most of them are farther away than people can take a closer look. Far-sightedness can only see one big effect, and it is impossible to see the craftwork of the exterior wall surface. Therefore, the necessity of using such high-grade materials for most exterior walls is questionable. Thirdly, from ancient times, there are not many instances of merely adhering to decorative materials and decorating themselves. Each material has its own characteristics and advantages, and we should not measure its strengths and weaknesses from the grade and price of the material.
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