[China Aluminum Network] Insulation (insulated bridges) Aluminum alloy doors and windows are new products introduced from abroad into China in recent years. It is made of heat-insulating aluminum alloy profiles. The heat-insulating aluminum alloy profiles are divided into two categories: one is a wear strip type, and the other is a cast type. At present, more than 80% of insulated aluminum doors and windows on the market are made of strip-type insulated aluminum alloy profiles. Therefore, this type of insulated aluminum alloy doors and windows is the leading product on the market. The strip type heat insulation aluminum alloy profile divides the traditional one-piece aluminum profile into two, and then uses two low thermal conductivity thermal insulation strips to join the separate aluminum profiles through mechanical composite means. A way to solve the problem of heat conduction of aluminum doors and windows profiles. This kind of insulated aluminum doors and windows has been used in Europe for more than 30 years, especially in the selection of materials, structure, and stress control, connection, sealing and other quality control of aluminum doors and windows, accumulated mature experience, developed a The entire set of technical standards. With reference to relevant European standards, China has formulated and issued a national technical standard for heat insulation aluminum profiles. However, there are still many unsatisfactory places in the production and use of aluminum doors and windows in China. Among the various kinds of information fed back by the market, the inferior quality aluminum doors and windows products are particularly prominent in the quality problems of profile insulation. This not only causes market chaos, often causes disputes, but also does not guarantee the quality of the project and damages the interests of consumers. One of the poor quality heat insulation aluminum doors and windows method "stealing the column". Low-cost general-purpose plastic PVC insulation strips (hereinafter referred to as PVC insulation strips) are used instead of glass fiber reinforced polyamide nylon (PA66) insulation strips (hereinafter referred to as nylon 66 insulation strips). 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 Poor (80°C), poor anti-aging properties, and other defects, resulting in the actual installation of insulation doors and windows, due to thermal expansion and contraction will cause the PVC insulation bar loose within the aluminum profile, from light to cause The form is loosened and deformed, destroying the airtightness and watertightness of doors and windows, and causing the form to become loose and detached. Especially in the “Three North†region of China, the temperature difference between indoor and outdoor in winter is large, and the above phenomenon is more likely to occur. Because the market price of PVC insulation is only 1/3 of the price of nylon 66 insulation, significant price differences cause many insulation aluminum doors and windows manufacturers to ignore the performance and quality defects of PVC insulation, and put inferior products on the market. . Insufficient heat insulation aluminum doors and windows method of "two days". Some insulated aluminum doors and windows manufacturers bid using thermal insulation windows using high-quality nylon 66 insulation. After winning the bid, in the actual construction, PVC insulation bars or inferior nylon insulation bars were used, or some inferior materials were used. The adoption of "Sky over the sea" is highly concealed. Because the finished window is not easy to identify. Insufficient quality of heat insulation aluminum doors and windows of the third method of "fish in troubled water." Some door and window companies have adopted a relatively safe compromise solution after mastering the performance and price differences between PVC insulation strips, inferior nylon insulation strips and high-quality nylon 66 insulation strips. Profiles are made of low-quality, low-cost PVC or poor quality nylon insulation. Window sash profiles use high-quality nylon 66 insulation. However, the airtightness and watertightness of the form are ensured by the stability of the overall shape of the window. Therefore, this practice has a quality problem.
