The surface of a good broken bridge aluminum profile has luster and texture, and the surface color treatment is natural, giving people a smooth feeling; Two broken aluminum doors and windows have rough surfaces and insufficient colors. After a period of use, they will change color or fade.
Second, look at the cross-sectional structure of profiles.
A good broken bridge aluminum door and window profile has accurate geometric angle, no bending and distortion, correct angle and sufficient section thickness. For example, the section thickness of 60-type broken bridge aluminum doors and windows is 6 cm, the components are full and the proportion of wear strips is small; The second broken bridge aluminum doors and windows, with 60 profiles and virtual support, the thickness is supported by strips, and the aluminum will be less.
Third, look at the heat insulation strips of profiles.
Most of the domestic insulation strips are plastic PVC, while the imported insulation strips are polyamide, that is, nylon insulation strips. For high-quality broken aluminum doors and windows, imported heat insulation strips are generally used, which have better high and low temperature resistance and low thermal conductivity, and can achieve the effects of heat insulation, environmental protection and energy saving.
Three "tricks" commonly used in inferior broken bridge aluminum doors and windows
First, "stealing the beam and replacing the column"
The use of low-cost PVC insulation strips that can only be used for non-structural materials, which are clearly stipulated by the relevant state departments, instead of the insulation strips that have been widely used in Europe for decades, leads to the loosening or even falling off of PVC insulation strips in aluminum profiles due to thermal expansion and contraction after the broken aluminum doors and windows are actually installed and used, which may lead to the loosening and deformation of windows, damage the air tightness and water tightness of doors and windows, and even lead to the overall loosening and falling off of windows.
Second, "opportunistic"
Some broken-bridge aluminum doors and windows enterprises have fully studied and mastered the huge performance differences among PVC insulation strips, domestic nylon insulation strips and imported nylon insulation strips, and adopted an economical and relatively safe compromise scheme: low-quality and cheap PVC or domestic nylon insulation strips are used for aluminum profiles of window frames, and high-quality imported nylon insulation strips are used for aluminum profiles of window sash. They think that the aluminum profile of window frame is fixed on the wall, even if there is quality risk, there will be no big problem, while the aluminum profile of window sash is movable and bears stress alone, so there can be no quality hidden danger.
Third, "make up a few things"
Some broken-bridge aluminum doors and windows enterprises, by studying consumers' psychology, found that consumers only care about the material of heat insulation strips, but rarely consider the alloy quality of the two layers of aluminum alloys outside, so they made broken-bridge aluminum doors and windows with unqualified aluminum alloys, which led to the lax assembly angle of window sash and frame, and it was difficult to insulate doors and windows.
How to buy broken aluminum doors and windows?
First, look at the materials.
The thickness, strength and oxide film of aluminum profiles for high-quality aluminum alloy doors and windows should meet the relevant national standards. If it can't meet the national standards, it is inferior aluminum alloy doors and windows and can't be used.
Second, look at processing.
High-quality aluminum alloy doors and windows, fine processing, exquisite installation, good sealing performance and convenient opening and closing; Inferior aluminum alloy doors and windows, blindly choose aluminum profile series and specifications, process inferior materials, replace milling with sawing, fail to install as required, have poor sealing performance, uncomfortable switch, not only air leakage and rain leakage, but also the phenomenon of glass cracking, and when encountering strong winds and external forces, it is easy to scratch or touch push-pull parts or glass, destroying things and hurting people.
Third, look at the price.
Under normal circumstances, the price of high-quality aluminum alloy doors and windows is about 30% higher than that of inferior aluminum alloy doors and windows because of the high production cost. If the price of some broken aluminum doors and windows is too low, you should pay more attention when buying. It should be noted that "a penny for a penny" is always right.