Broken bridge aluminum doors and windows have advantages and disadvantages. The price of good broken aluminum doors and windows is much higher than that of inferior ones. In order to reduce the production cost of broken bridge aluminum doors and windows, some door and window manufacturers often purchase some unknown broken bridge aluminum materials. What's the difference between broken aluminum doors and windows? Let the old carpenter Luban doors and windows tell you three "tricks" commonly used by those inferior broken aluminum doors and windows.

"steal the beam and replace the column"

Use low-cost general plastic (PVC insulation strip) which is clearly stipulated by relevant departments and can only be used for non-structural materials to replace the insulation strip recognized in Europe for decades. After the actual installation and use, the PVC insulation strips in aluminum profiles become loose or even completely fall off due to thermal expansion and contraction, which may lead to the loosening and deformation of windows, thus destroying the air tightness and water tightness of doors and windows, and even leading to the overall loosening and falling off of windows.

"opportunism"

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 66 insulation strips, and adopted an economical and relatively safe compromise scheme: low-quality and cheap PVC insulation strips or domestic nylon insulation strips are used for window frames, and high-quality imported nylon 66 insulation strips are used for window sashes. 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.

"Make up a few things"

Some broken bridge aluminum doors and windows enterprises are studying people's psychology. People only care about the material of the heat insulation strip, but seldom consider the alloy quality of the outer two layers of aluminum alloy. They use unqualified aluminum alloy to make broken bridge aluminum doors and windows, which leads to the lax assembly angle of window sash and window frame, and it is difficult to insulate the doors and windows. Therefore, not only the quality of the insulation strip, but also its aluminum alloy depends on its hardness and strength, and the surface of the profile is also different from electrostatic spraying and electrophoretic coating.