ã€China Aluminum Industry Network】 Aluminum composite panels are 0.5mm thick aluminum plates sandwiched between 2-5mm thick aluminum plates on the inside and outside, and the surface is coated with a very thin fluorocarbon spray coating. The composite panel is characterized by uniform color, smooth surface, and easy fabrication. However, this composite panel has the disadvantage that the intermediate interlayer of the composite panel contains poisonous components, and the gas is poisoned when it is burned or reaches high temperatures. The environment is contaminated. At the same time, the aluminum plate and the PVC sandwich are pressed together by cementation. The composite strength is not high. The aluminum plate and the interlayer can be separated by force and pull between the two layers.
In addition, due to the thinness of the aluminum plate, the composite plate can easily expand due to the expansion of the locally heated interlayer and cause the aluminum plate to bulge outward. From the point of view of curtain wall lightning protection, aluminum composite panels are made of two layers of 0.5 mm thick aluminum sheet bonded with polyethylene under pressure. Polyethylene is a poor conductor, and two layers of aluminum sheet are in an insulated state. Although aluminum alloy sub-frame is added to the inner layer when the composite aluminum plate is made, the rivets and the aluminum composite plate are fixedly connected at the four sides; since the riveted surface is too small, it is more important that 0.5mm aluminum thin plate is too thin, in case of lightning, the large flash current will penetrate the 0.5mm aluminum thin plate when the building develops laterally around the curtain wall plate, and strong current is difficult to make the building subject to lightning strike through the composite plate grounding.
From the production of aluminum composite panels to see: aluminum composite board production first in the composite board slotted four sides, cut off a certain width and one side of the aluminum plate and plastic layer leaving only 0.5mm thick outer aluminum plate, four sides bent 90 ° angle into a rectangle, Then use the aluminum material to make rectangular sub-frames of the same size in the rectangular slots of the aluminum-plastic panel. The bottom of the sub-frame is glued with the back of the aluminum-plastic panel. The four edges of the composite panel are fixed to the four sides of the sub-box by riveting, and the middle of the rectangle. Then glue one to several aluminum profile reinforcements with the structure. At present, most of the installation and production units are not manufactured according to the above-mentioned methods, but after the aluminum composite plate is slotted, the upper side is bent at an angle of 90°, and only the four folding edges of the composite plate are fixed with angle aluminum. In this way, the self-weight of the board and any external forces received by the board are carried by the four side 0.5mm aluminum plates, and the safety is low. Any curtain wall is subject to different positive and negative wind load pressures at any time. The 0.5mm edge of the board is very easy to break. This phenomenon has appeared in most projects. Therefore, the aluminum alloy composite panel curtain wall must be manufactured with aluminum alloy sub-frames and ribs.
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