Based on the pressure balance principle, the structural drainage system is designed for the aluminum doors and windows of bridge break, and the inclined plane ladder type is designed for sliding down, and the drainage outlet is set, so the drainage is smooth and the water tightness is good. At the same time, the straight material of aluminum door and window frame adopts hollow design, which has strong anti wind deformation ability and good anti vibration effect. It can be used in high-rise buildings and residential buildings. It can be designed with large area window type and large lighting area. The air tightness of this window is better than any aluminum or plastic window, which can ensure that there is no dust in the window sill and floor in the area with heavy wind and sand.
In addition to the excellent thermal insulation and sealing performance of aluminum doors and windows, it also has the characteristics of good thermal insulation and sealing. Aluminum alloy doors and windows are now widely used in buildings. Although the previous aluminum alloy windows avoid some shortcomings of steel windows, the profiles themselves are metal materials, which have fast heat and cold conduction, and can not fundamentally solve the problems of sealing and heat preservation. At present, many door and window enterprises have developed a bridge broken thermal insulation building aluminum profile, that is, in the middle of the aluminum profile, hard plastic is used to cut off the heat conduction of aluminum alloy, so as to achieve the same heat insulation effect as plastic steel window, and solve the problem of high heat transfer coefficient of aluminum profile.
Aluminum alloy doors and windows have occupied half of the door and window industry, but many consumers are worried about buying unqualified and inferior products when they buy aluminum alloy doors and windows. Because unqualified aluminum alloy doors and windows will be affected by sunlight, air, rain and other factors when they are used, resulting in aluminum profile deformation and even glass cracking and falling off. In order to help consumers buy qualified products, experts listed three standards for inferior aluminum alloy for reference
What are the characteristics of unqualified aluminum alloy doors and windows
1、 The thickness of oxide film is thin
According to the national standard, the thickness of oxide film on aluminum profiles should not be less than 10um (micron). If the thickness is not enough, the surface of aluminum profile is easy to rust and corrosion. The thickness of oxide film of some aluminum profiles without production name, factory site, production license and certificate is only 2 to 4um, and some of them even have no oxide film. According to experts' estimation, the cost of power consumption can be reduced by more than 100 yuan per ton of profile for every 1 um reduction of oxide film thickness.
2、 Unqualified chemical composition
Adding a large amount of miscellaneous aluminum and waste aluminum can greatly reduce the cost, but it will lead to unqualified chemical composition of building aluminum profiles, seriously endangering the safety of construction projects.
3、 Reduce the wall thickness of profile
According to the national standard, the minimum wall thickness of aluminum profile is not less than 1.4mm, but the wall thickness of many products on the market is only 0.6-0.7mm. The minimum wall thickness of aluminum profile used in the national standard is not less than 1.62mm, while the wall thickness of some products is only 0.97-1.18mm.
Low quality aluminum profiles greatly reduce the sealing time, chemical reagent loss and cost, but the corrosion resistance of profiles is also greatly reduced.