ã€China Aluminum Industry Network】 The current quality problems and awareness gaps in the actual use of heat-insulating aluminum doors and windows in China are very worrying. Under the premise of clearly understanding your home-breaking aluminum profiles, the more common four types are: Moves":
The first is “stealingâ€: using low-cost national authorities to specify that general-purpose plastics that can only be used for non-structural materials—polyvinyl chloride (PVC) insulation strips (hereinafter referred to as PVC insulation strips) instead of European recognized universals Several decades of glass fiber reinforced polyamide nylon (PA66) insulation strip (hereinafter referred to as nylon 66 insulation strip). Because the coefficient of linear expansion of PVC (8.3*10-5K-1) is very different from that of aluminum alloy (2.35*10-5K-1), and its strength is low (only about 30N/mm2), heat resistance Many defects such as poor sex (80°C), poor anti-aging properties, etc., lead to the insulation of windows and doors made of heat-insulating aluminum profiles after being compounded with PVC heat insulation strips. PVC will cause PVC after heat insulation due to thermal expansion and contraction. Insulation bars appear loose inside the aluminum profile, and are even completely detached, and the looseness and deformation of the form are caused by the looseness, thereby destroying the airtightness and watertightness of the doors and windows, and causing the entire form to become loose and detached.
The second is to “cross the oceanâ€: At present, there are no shortages of examples of heat-insulating aluminum doors and windows. Some companies use the thermal insulation sample window of the imported nylon 66 insulation strip to bid. After the winning bid, PVC insulation bars or domestic nylon insulation bars are used for actual processing. Or use imported nylon 66 insulation strips mixed with PVC or other insulation strips, and the imported nylon 66 insulation strips with the trademark logo face to the outside to "prove" the "quality grade identity" of the insulation strip used. This kind of “over-the-horizon sea†is highly concealed, and the owner of the insulated aluminum door and window project can only identify the heat-insulating aluminum profile before it has been processed, because only the two thermal insulation bars at this time are identifiable.
The third is “Trouble fishing in muddy waterâ€: The material of the insulation strip is the basic guarantee for the quality of the insulation doors and windows, but it is by no means a guarantee. In 2003, domestic nylon insulation bars began to appear on the market. In order to reduce costs, domestic nylon insulation bars use general mineral materials (commonly known as fillers) in place of glass fibers to fill polyamide nylon for processing. The thermal insulation strip cannot be compared with the glass fiber reinforced nylon 66 thermal insulation strip in terms of mechanical strength, heat resistance, anti-aging properties, and the like. In addition, since the national “insulation bar†industry standard is still in the process of later approval, domestic nylon insulation bars are used to test the relevant properties of the injection molded parts made of nylon and common minerals, and the results are tested. The report is presented as a test report of the performance of the finished insulation strip. The test data of this raw material can only represent its material properties, and the performance of finished products produced after undergoing hot extrusion and cooling processes will greatly change.
The fourth is "opportunity:" Some heat-insulating aluminum doors and windows companies have adopted the economy after fully researching and grasping the large performance differences between the PVC insulation strip, the domestic nylon insulation strip and the imported nylon 66 insulation strip. It is also a relatively safe compromise: window frame aluminum profiles are made of low-quality, inexpensive PVC or domestic nylon insulation strips, and window sash aluminum profiles are made of high-quality imported nylon 66 insulation. They believe that: window frame aluminum profiles are fixed on the wall, even if there is a quality risk will not be a big problem, while the window fan aluminum profile is active and is carrying a separate force, so we can not but do not dare to have quality problems .
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