Distinguish the advantages and disadvantages of high-end system doors and windows;
First of all, look at the surface quality of profiles.
The quality of profiles can be observed from the surface of high-end system doors and windows profiles. Good high-end system doors and windows profiles have a shiny and textured surface, and the surface color treatment will be more natural and look smoother. The second high-end system has rough and dull doors and windows, which look unnatural. After a period of use, the doors and windows of inferior high-end systems will change color or fade, and the color is not full.
Second, look at the cross-sectional structure of profiles.
Good high-end system, the geometric angle of door and window section is accurate, the section will not be bent and twisted, and the angle is correct. Moreover, the profile is thick enough, such as your customized 60-type high-end system doors and windows. 60 indicates that the profile thickness is 6 cm, which is a complete high-end system door and window material with a small perforation ratio; The second high-end system doors and windows, doors and windows, will use the virtual support of 60 profiles, and support this thickness with rubber strips, with less aluminum.
Third, look at the heat insulation strips of profiles.
Insulating strips are imported and made in China. Most domestic insulation strips are plastic PVC, while imported insulation strips are polyamide, that is, nylon insulation strips. High-quality doors, windows and doors of high-end system adopt imported heat insulation strips, 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, and can save energy by 20%-30%.
Five most commonly used "moves" for doors and windows of inferior high-end systems
One is "stealing columns":
Low-cost general plastic -PVC insulation strip (hereinafter referred to as PVC insulation strip) which can only be used for non-structural materials is used to replace glass fiber reinforced polyamide nylon (PA66) insulation strip (hereinafter referred to as nylon 66 insulation strip) which has been recognized in Europe for decades. Because the linear expansion coefficient of PVC (8.3* 10-5K- 1) is far from that of aluminum alloy (2.35* 10-5K- 1), it has low strength (only about 30N/mm2) and heat resistance (80. After actual installation and use, PVC insulation strips in aluminum profiles will become loose or even completely fall off due to thermal expansion and contraction, which will 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.
The second is "hiding the sky and crossing the sea":
There are many companies bidding for importing nylon 66 thermal insulation model windows in the thermal insulation aluminum doors and windows project. After winning the bid, they used PVC insulating rods or domestic nylon insulating rods for actual processing, or used imported nylon 66 insulating rods to mix with PVC or other insulating rods, and put the imported nylon 66 insulating rods with trademark marks outward to "prove" the "quality grade identity" of the insulating rods used. This kind of "crossing the sea from the sky" has a strong concealment, and the owner of the thermal insulation aluminum door and window project can only identify it before the thermal insulation aluminum profile has been processed, because only in this way can two thermal insulation strips be identified.
The third is "fishing in troubled waters":
The material of heat insulation strip is the basic guarantee of the quality of heat insulation doors and windows, but it is by no means the only guarantee. In 2003, domestic nylon insulation strips entered the market. In order to reduce the cost, domestic nylon thermal insulation strips are filled with polyamide and nylon with general mineral materials (commonly known as fillers), which completely or partially replace glass fibers for processing. This kind of insulation strip is incomparable to glass fiber reinforced nylon 66 insulation strip in mechanical strength, heat resistance and aging resistance. Moreover, because the national industry standard of "Building Insulation Strip" is still in the final examination and approval process, the domestic nylon insulation strip is used to test the related performance of injection molded parts made of nylon mixed with general minerals, and the obtained test report shows the performance test report of its finished insulation strip. The test data of this raw material can only represent its material properties, and the properties of the finished products produced after hot extrusion and cooling will change greatly.
The fourth is "opportunistic":
After fully studying and mastering the huge performance differences among PVC insulation strips, domestic nylon insulation strips and imported nylon 66 insulation strips, some aluminum door and window enterprises have adopted an economical and relatively safe compromise scheme: low-quality and cheap PVC 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.
Fifth, "fill the vacancy":
Some insulation aluminum doors and windows enterprises are studying people's psychology. People only care about the material of the insulating strip, but seldom consider the alloy quality of the outer two layers of aluminum alloy. According to the national standard, the aluminum alloy used for building profiles is 6063 brand alloy, but some enterprises use unqualified aluminum alloy to make insulated aluminum composite doors and windows, which leads to the lax assembly angle of window sash and window frame and the difficulty of door and window insulation. Therefore, it is not only the quality of the insulation strip, but also the hardness and strength of its aluminum alloy. There are also differences between electrostatic spraying and electrophoretic coating on the surface of profiles. See Baidu Encyclopedia's "Electrostatic Spraying Technology" and Baidu Encyclopedia's "Electrophoresis Technology" for details. "Electrophoresis process" was founded in 1960s, and was first applied to automobile primer by Ford Motor Company. Because of its excellent color fastness and anticorrosion function, it was quickly widely used in military industry. It has only been applied to the surface treatment of doors and windows in recent years. Because of its excellent quality and high environmental protection, it is gradually replacing the traditional painting. Electrophoresis is that charged coating ions move to the cathode under the action of voltage applied to the anode and cathode, and react with the alkalinity generated on the cathode surface to generate insoluble substances, so that the coating is deposited on the aluminum alloy surface.
To sum up, we can see that the market of insulated aluminum doors and windows was worrying before the industrial standard of special insulating strips for insulated aluminum doors and windows was issued, and the owners of insulated doors and windows did not have a comprehensive and profound understanding of the new technology of insulated aluminum doors and windows, which was the main reason for these phenomena. However, we should call on people of insight in the door and window industry to standardize this disorderly competition as soon as possible with an objective and scientific attitude, product quality as the lifeline and professional ethics responsible to consumers. The professional attitude of being responsible for product quality and people's quality of life is the principle of establishing enterprises and people. Otherwise, even if the relevant standards are issued, it will be in vain. Standards are formulated to check the quality of products. Without quality awareness, everything will become useless.