The perfect organic combination of a performance system for system doors and windows requires consideration of a series of important functions such as water tightness, air tightness, wind pressure resistance, mechanical strength, heat insulation, sound insulation, anti-theft, sun shading, weather resistance, and operating feel. Considering the comprehensive results of the performance of equipment, profiles, accessories, glass, viscose, and seals, all of them are indispensable, and finally high-performance system doors and windows are formed.
1 Causes of corner problems
1.1 Temperature difference
Due to temperature changes, the material itself usually has a certain stress effect, which is manifested as a linear expansion/contraction ratio. The perfect organic combination of a performance system for system doors and windows requires consideration of a series of important functions such as water tightness, air tightness, wind pressure resistance, mechanical strength, heat insulation, sound insulation, anti-theft, sun shading, weather resistance, and operating feel. Considering the comprehensive results of the performance of equipment, profiles, accessories, glass, viscose, and seals, all of them are indispensable, and finally high-performance system doors and windows are formed.
The dimensional change of aluminum alloy profile in the normal use temperature range, that is, the calculation formula of linear expansion/shrinkage rate is:
In the formula, the changed length;
Original length;
The coefficient of expansion and contraction in the range of -4050 ° c is 2.410-5 ° c;
The temperature change value in degrees Celsius.
According to the formula, the change of 1m long aluminum alloy profile under the temperature difference of 90°C in the range of -40 to 50°C: This rate of change of 2.16mm is sufficient to cause the corners of doors and windows to lose mutual position or deformation, resulting in a decrease in corner strength and sealing performance. Energy saving is more difficult.
1.2 External force
Many companies are ubiquitous and unavoidable. The deformation temperature stress caused by the inevitable and accidental external forces will cause the corner problems of the doors and windows, such as the production, transportation development, and the construction management of the installation project. Collision, knocking; After the installation of doors and windows is completed, long-term analysis of the weight of its own products and the effect of static stress on window openings and wall deformation; opening and closing of windows, wind pressure, environmental sound waves and other vibrations pass through. These data can cause the air-tightness, heat insulation, sound insulation, and dust-proof performance of doors and windows to continue to decline. In severe cases, it will increase the deformation of doors and windows, which has become the main research reason for energy consumption of doors and windows.
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