Fourteen main features of the new aluminum doors and windows?
[Answer] First, the wind pressure resistance and watertight performance:
Due to the low strength and rigidity of the steel doors and windows, although the lining is strengthened, its wind pressure resistance and watertight performance are about two grades lower than that of the aluminum alloy doors and windows. The standard sample window sent by the enterprise is the same, and the same is done at the construction site. The average value of the “three performances†measured by the Shanghai Building Curtain Wall Testing Center for the aluminum alloy doors and windows and plastic steel doors and windows installed on the site is: “In addition to air tightness, the watertightness and wind pressure resistance of plastic steel doors and windows are This result is unexpected compared to the aluminum alloy doors and windows, but after further analysis, it reflects the important problems in the quality of plastic steel doors and windows." Moreover, since the lining steel of the plastic steel doors and windows is not connected to the complete frame system at the corners of the inner cavity of the profile, the plastic welding angular strength of the window frame, the fan four corners and the dicing point is relatively low.
Second, airtight performance:
Plastic steel doors and windows are welded because the frame and fan components are welded, so the airtightness should be slightly better than that of the aluminum alloy doors and windows connected by screws. However, the aluminum alloy door and window profiles have higher dimensional accuracy, and the frame and fan are tightly matched, so the two are still in At a level.
Third, insulation performance:
The thermal insulation performance of aluminum alloy is not as good as that of plastic steel doors and windows, but because the heat transfer coefficient k of the formula k=1/(1/ai+Rw+1/ae) is calculated according to the thermal conductivity of the window, it depends not only on the transmission of the form itself. The thermal resistance Rw (the reciprocal of the heat transfer coefficient of the form itself) also depends on the form. The indoor and outdoor surface heat transfer coefficients ai and ae; and according to another calculation formula k = k frame · f + k glass · (1-f), the window heat transfer coefficient k value by the window frame, fan member and window glass The composition of the two parts of k-frame and k-glass is directly related to the window area ratio of the window frame fan, and the frame window of the aluminum alloy window occupies about 10% of the entire window area, and the aluminum door and window frame fan profile is also Not solid, and the wall thickness of the hollow aluminum profile (the actual thermal bridge) is about 40% smaller than the wall thickness of the plastic profile.
Fourth, lighting performance:
The lighting performance of plastic steel doors and windows is worse than that of aluminum alloy doors and windows. The shading area of ​​framed fan members is about 10% larger than that of aluminum alloy doors and windows. The visual field and decorative effect are poor, which is not conducive to energy saving and consumption reduction of architectural lighting.
Five, sound insulation performance:
The sound insulation performance of the window mainly lies in the sound insulation effect of the glass which accounts for about 80% of the window area. The gap sealing level of aluminum alloy doors and windows and plastic steel doors and windows is basically the same, and the sound insulation performance is basically the same. The Shanghai Academy of Building Research conducted a series of sound insulation performance measurement and comparison experiments on plastic steel doors and windows and aluminum alloy doors and windows; the sound insulation of 5mm thick single glass plastic steel doors and windows is about 21-24dB; 5+12A+5 hollow single frame double The glass-plastic steel doors and windows are 24-29dB; the double-glass sound insulation is about 5dB larger than the single glass; the plastic steel doors and windows and the aluminum alloy doors and windows "at the minimum thickness, the same structure and the sealed condition, the weight of the sound insulation RW The values ​​are similar."
Sixth, fire performance:
The fire resistance of flame retardant pvc plastic doors and windows is better than that of flammable wood doors and windows, but it is inferior to non-combustible aluminum alloy doors and windows.
Polyvinyl chloride plastic is a kind of non-combustible material. Under the action of fire, it will burn slowly after encountering open flame. If it is away from fire, it will self-extinguish. The mechanism of its flame retardant is hydrogen chloride released during combustion, which has the function of capturing H, OH and free radicals, and becomes difficult to burn. When burning, toxic gases such as HCLCOCO2 are released. The hazard of smoke is the main cause of major casualties in a building fire. Therefore, some countries in Europe stipulate that public buildings should not use pvc doors and windows to avoid unnecessary harm. Regarding the fire performance of doors and windows: steel doors and windows and aluminum doors and windows are relatively good, plastic doors and windows and wooden doors and windows are relatively poor.
7. About lightning protection and static electricity:
Aluminum alloy is a good electrical conductor, so it is used as a lightning protection facility and can prevent static electricity when it is used as a building peripheral structure. Pvc plastic is a non-conductive insulator when it is used in high-rise buildings. When the lightning protection building is more than 30m, the second type is more than 45m, and the third type is more than 60m, the anti-side lightning strike problem cannot be solved. Moreover, if it is not used for anti-static treatment, it is difficult to clean static dust and dirt when it is used in civil buildings, which affects the appearance decoration; for industrial buildings, it cannot be used in explosive workshops such as dust, electronic or electrical assembly workshops and computers. Room and so on. According to the data, for electrostatic fire protection of plastics, antistatic oil containing quaternary ammonium salts can be applied to the surface to absorb moisture in the air and increase conductivity. However, domestic plastic doors and windows are not treated with antistatic coatings.
Eight, decorative:
Plastic doors and windows as the exterior windows of the building can only be dominated by white. Because white or light gray pvc profiles have good weatherability and light stability, they are not easy to absorb heat. The colored PVC profiles are heat-resistant and weather-resistant, and can only be used indoors. Color decoration is crucial to the effect of architectural art. The single white color of plastic doors and windows is a huge defect, which can not meet the needs of various kinds of exterior decoration of various buildings. Relatively speaking, aluminum doors and windows have a variety of surface treatment technologies such as powder coating, anodizing, electrophoretic coating, wood grain transfer processing, etc., and the surface color selection is large, and there are various colors such as white and green, wood grain, granite, etc. A variety of surface colors.
Nine, aging problem:
Aluminum alloy profiles are durable, there is no aging problem, and pvc plastic profiles do age. At present, China's plastic doors and windows are basically based on the lead salt system formula of Germany and Austria, and some enterprises use the American organic tin system formula. The domestic artificial accelerated photoaging experiment shows that the white profile containing the lead salt system is easily stained after photoaging, and the color becomes yellow after 1500 hours of light irradiation. The lead salt system is slightly lower in price, but its appearance color and durability are far less than those of organic tin stabilization systems. According to some data, the smooth surface of German plastic doors and windows in the first year will be roughened by the weathering effect. The comparison photos after more than ten years show the weathering process of pvc profiles. The weathering layer is thick to 0.3-0.4 mm, and the decomposition of the underlying layer of polyvinyl chloride will stop. Under the action of ultraviolet light, the polymer pvc resin breaks the chain of the large part, causing the surface of the material to lose its luster, discoloring and pulverizing, and the mechanical properties of the profile are degraded. Steel doors and windows in the doors and windows of similar buildings are prone to rust, wooden doors and windows are easy to break, and their service life is generally not long.
Ten, deformation and expansion problems:
Plastic steel doors and windows are susceptible to heat deformation, cold and brittle, and poor dimensional and shape shift stability. It is often necessary to use the rigidity of the glass to prevent deformation of the window frame. Therefore, foreign countries only install plastic glass in the factory before leaving the factory to prevent deformation during storage, transportation and installation. Moreover, the elastic body seal which is filled with foamed plastic after being sealed between the window frame and the opening is installed. However, the construction habits of China's construction industry have caused plastic steel doors and windows not to be installed at the factory. Cement mortar is used to fill the gap between the window frame and the opening, and the thermal expansion coefficient of PVC plastic steel door and window frame is too large than steel, aluminum and cement. When the temperature difference between day and night is 20-700C, the PVC plastic steel door and window frame will be "squeezed" and cannot be freely stretched and deformed.
XI. Product weight:
Plastic steel doors and windows are lighter than aluminum alloy windows. Since the tensile strength of the plastic profile is 1/3 of the aluminum profile and the modulus of elasticity is 1/36 of the aluminum profile, the cross-sectional dimension and wall thickness of the plastic profile have to be designed to be larger than that of the aluminum profile, and A reinforced steel lining is added to the profile cavity to meet the wind pressure strength of the window and the need for assembly hardware accessories. China's European-style window improved plastic steel doors and windows, profile wall thickness of 2-2.5mm, profile consumption of 9-12kg / m2, according to steel lining consumption is 85% of the weight of the profile, the consumption of steel lining is 7.65-10.2kg / M2. Therefore, the weight of the plastic window type and the steel lining has exceeded the weight of the aluminum window profile by 4.5-7.5kg/m2. In addition, the steel doors and windows and solid wood doors and windows are generally cumbersome.
12. Production energy consumption and energy consumption:
The ratio of energy consumption per unit volume of aluminum alloy doors and windows and plastic steel doors and windows is 8.8 times, but the ratio of production energy consumption per unit area is 2.55 times. For the energy consumption of windows, the heat transfer measured under winter insulation conditions. Compared with the coefficient, it can only be said that the heating and insulation energy consumption of plastic steel doors and windows is 27-31% lower than that of aluminum alloy doors and windows. Because the heat transfer coefficient of summer windows is different from that in winter, it can not be said that the summer air conditioning cooling energy consumption effect is also the same. The summer insulation performance of the window is not the same as the winter insulation performance and cannot be simply confused.
Thirteen, profile mold costs:
From the perspective of the mold opening cost of the profile extrusion die, the plastic window steel window is about 3 positions of the aluminum window. The economical and flexible development of aluminum alloy door and window products is better than plastic steel doors and windows.
Fourteen, product performance / price ratio:
The performance/price ratio of aluminum alloy doors and windows is higher than that of plastic steel doors and windows. The price of aluminum alloy doors and windows in foreign countries is 1.5 times that of plastic steel doors and windows, that is, the price of plastic steel doors and windows is 33% cheaper than that of aluminum doors and windows. However, the situation in China is the opposite. Generally speaking, the price of single glass plastic steel doors and windows is 25-33% higher than that of aluminum alloy doors and windows; the price of hollow double glass plastic steel doors and windows is 36-44% higher than that of aluminum windows. Of course, the insulation properties of these two types of plastic steel doors and windows are better than those of aluminum alloy doors and windows. Better, but other performance steel doors and windows are not as good as aluminum alloy doors and windows. The price of hollow double glass aluminum alloy doors and windows is about 25% higher than that of single glass plastic steel doors and windows. However, the former's insulation and sound insulation and other properties are better than the latter. For the same type of structure, the inner casement window is in the aluminum alloy window. Insulation performance index (K=2.8) of insulating profile insulating glass reaches the level of hollow double glass window of plastic steel door and window (K=2.7), the price of the latter is about 24% higher than the former; however, the former has high strength and high Performance, excellent corrosion resistance (painting) and decorative effects (metal and non-metallic textures, various colors and frames, window frames can be used indoors and outdoors), long-term service life and other comprehensive performance is far better In the latter.
The above contents are compiled according to the problems encountered by the students in the actual work, for reference, if there is any problem, please communicate and correct in time. [ Follow the WeChat public account "Jiuzhengmen Window Network"; pay attention to courtesy, scan code to send millions of business opportunities! Jiuzhengmen window network exchange group ]
This type T-Nuts are used for climbing wall, with a good tensile strength.
We have 4 types available now.
1. Rectangular base with 2 hole, thread size: M10, barrel height: 10mm
Hebei Xinyu Metal Products Co.,Ltd is a ISO9001 cerificated enterprise,which specialize in
manufacturing and exporting Furniture Nuts .Product including
Wing Nuts , Hopper Feed T Nuts , Propeller Nuts , Weld Nuts , Pallet Nuts , Locking Nuts , Rivet Nuts , Doggie Tooth Washers , Steel Stamped Parts , Hopper Feed Rivet T Nuts , Metal Stamped Parts ,
T-Nuts For Cliff-Climbing,Furniture Nuts, Tee Nut For Rock Climbing holding, Insert Tee Nut ,Middle steel Zinc Plated Stamping Wing Nut, Auto Flat Plane Weld Nuts ,
Automobile Spot Welding Nut,Customer-Made Metal Stamping Parts, Cold Heading Tee Nuts ,Stainless Steel Butterfly Nuts, Furniture Eccentric Wheel , Cam Lock Furniture Nut .
Our key strength are custom made special fasteners according to drawing or sample .We have longer and stable business relationship with well-known companies from American, Poland,Germany,French and so on.In the future ,xinyu will continue focusing on innovation special designed products,becoming your most trusted partner.
T-Nuts For Cliff-Climbing
T-Nuts For Cliff-Climbing,Cliff-Climbing Tee Nut,Indoor Cliff Climbing Stamped Nuts,Three Holes T-Nuts
Hebei Xinyu Metal Products Co.,Ltd , https://www.t-nuts.net