[China Aluminum Industry Network] First, wind pressure strength and watertight function:
Because steel doors and windows have low raw material strength and rigidity, even though they have been reinforced by joining linings, chromium-zirconium-copper-clad panels have lower air pressure resistance and watertightness than aluminum alloy doors and windows. This is the case for the sample window submitted by the company, and this is also the case for sampling at the construction site. In the middle of the construction of curtain wall inspection in Shanghai, the aluminum alloy doors and windows and plastic steel doors and windows entering the construction site were selected as the witness sampling method for the average value of the “triple utility†measured. “In addition to the airtightness, the watertightness and wind pressure resistance of the steel doors and windows are both Compared with aluminum alloy doors and windows, this result is unexpected, but after further analysis, it reflects the important issues in the quality of steel doors and windows.†Moreover, because the lining steel of steel doors and windows is not connected to the intact layout system at the corners of the inner cavity of its profile, the plastic welding angles of the window frame, the four corners of the fan, and the small-sized dots are relatively low.
Second, airtight function:
Plastic steel doors and windows are welded because of the frame and fan components, so their airtightness should be slightly better than the aluminum alloy doors and windows that are screwed. However, aluminum alloy doors and windows profiles have higher dimensional accuracy, and the cooperation between frames and fans is tighter, so the two are still At a grade level.
Third, the insulation function:
The heat preservation function of aluminum alloy six windows is not as good as that of plastic steel doors and windows, but due to the calculation formula of the thermal conductivity of aluminum bronze plate according to the window k=1/(1/ai+Rw+1/ae) The heat transfer coefficient k value of the window does not only depend on The heat resistance Rw of the form itself (reciprocal of the form's own heat transfer coefficient) also depends on the form. The indoor and outdoor heat transfer coefficients ai and ae; and in accordance with another calculation formula k = k box f + k glass (1-f), the window heat transfer coefficient k value from the window frame, fan components and window glass The composition of the two partial k-frames and k-glasses is directly related to the area ratio f of the window frame fan occupying the entire window, while the frame fan of the aluminum alloy window accounts for about 10% of the entire window area than the plastic steel doors and windows, and the profile of the aluminum door window frame frame fan is also Not solid, and hollow aluminum wall thickness (practical thermal bridge) is about 40% smaller than the plastic profile wall thickness.
Fourth, lighting function:
Plastic doors and windows of the lighting function than the aluminum alloy doors and windows are poor, the frame fan components shading area is 10% larger than the aluminum alloy doors and windows, visibility and embellishment effect is poor, is not conducive to the construction of lighting energy saving.
Fifth, sound insulation function:
The main function of the sound insulation of the window is the sound insulation effect of the glass that accounts for about 80% of the window area. Aluminum alloy doors and windows and plastic steel doors and windows of the gap seal level is fundamentally common, and its sound insulation function is also fundamentally common. Shanghai Institute of Construction of plastic steel doors and windows and aluminum doors and windows were a series of sound insulation function test and comparison test <6>; 5mm thick single glass steel doors and windows sound insulation volume is about 21~24dB; 5+12A+5 hollow single frame double glass steel doors and windows are 24~29dB; double glass sound insulation volume is 5dB larger than single glass; plastic steel doors and windows and aluminum alloy doors and windows "In the case of fewer glass thicknesses, the same layout, and similar sealing conditions, their weighted sound insulation is close to the RW value."
Sixth, fire prevention function:
The fire-retardant function of the flame-retardant pvc plastic doors and windows is comparable to that of flammable wood doors and windows. The copper belts are poor in comparison with non-incendive aluminum alloy doors and windows. Polyvinyl chloride plastic is a non-flammable material. Under the effect of fire, it will be burned slowly after encountering an open fire. If it is away from the fire, it will self-extinguish. Its flame-retarding mechanism is the hydrogen chloride released during incineration, which has the function of capturing H, OH, and free radicals and becomes flame-retardant<7>. HCLCOCO2 and other toxic gases are emitted when incinerated. The damage of smoke is the primary cause of serious casualties in the construction of an attack fire. Therefore, some countries in Europe stipulate that public buildings must not use pvc doors and windows to avoid unnecessary damage. Fire prevention functions of doors and windows: steel doors, windows and aluminum doors and windows are relatively good, plastic doors and windows and wooden doors and windows are relatively poor.
Seventh, on lightning protection and static electricity issues:
Aluminum alloy is an excellent conductor, so when it is used to construct the external layout, a useful grounding method can be used as a lightning protection device and static appearance can be avoided; pvc plastic is a non-conductive insulator when it is used for high-rise construction (1 More than 30m in lightning protection, more than 45m in Class II, and more than 60m in Class III) can't deal with the problem of side lightning. And, if it is not anti-static disposal, when it is used in civil construction, electrostatic dust collection and deposition will be difficult to clean, affecting the appearance of embellishment; on industrial construction, it can not be used in dust and other explosive workshops, electronic or electrical assembly workshops and computers. Room and so on. According to the material introduction, the electrostatic fire protection of plastics can be used to alter the anti-static oil agent rich in quaternary ammonium salt on its appearance, which can absorb the moisture in the air and add electrical conductivity. However, at present domestic plastic doors and windows are not disposed of without antistatic coating.
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