1. Pay attention to the tricks frequently used by merchants when purchasing:
(1) "stealing beams and changing columns"
It is recognized in Europe that polyvinyl chloride (PVC) heat insulation strip (hereinafter referred to as PVC heat insulation strip), a common plastic that can only be used for non-structural materials, which is clearly stipulated by relevant State departments with low cost, can be used to replace it, glass fiber reinforced polyamide nylon (PA66) insulation strip (hereinafter referred to as Nylon 66 insulation strip) has been used for decades. Because the linear expansion coeffcient (8.3*10-5K-1) of PVC is far from the linear expansion coeffcient (2.35*10-5K-1) of aluminum alloy, and its strength is low (only about 30N/mm2) and its heat resistance is poor (80℃), many defects, such as poor aging quality resistance, lead to the thermal insulation doors and windows made of insulated aluminum profiles made of PVC thermal insulation strips through strips. After actual installation and use, due to thermal expansion and contraction, PVC thermal insulation strips will loosen in aluminum profiles, even completely separated, light will lead to loose and deformed windows, thus damaging the air tightness and water tightness of doors and windows, while heavy will lead to loose and separated windows as a whole.
(2) "hide from the world and cross the sea"
In the case of thermal insulation aluminum doors and windows project, there are many enterprises bidding with thermal insulation sample windows of imported Nylon 66 thermal insulation strips, after winning the bid, PVC insulation strips or domestic nylon insulation strips are used for actual processing or imported Nylon 66 insulation strips are mixed with PVC or other insulation strips, while imported Nylon 66 insulation strips with trademark marks are facing outside, to "prove" the "quality grade identity" of the heat insulation strip used ". This kind of "hiding from the World" has strong concealment. The owners of heat-insulated aluminum doors and windows can only identify the heat-insulated aluminum profiles before they have been processed. Only at this time can the two heat-insulating strips be identified. Therefore, it is difficult to confirm clearly after processing.
(3) fish 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 order to reduce costs, domestic nylon insulation strips use general mineral materials (commonly known as fillers) to completely or partially replace glass fibers to fill polyamide nylon for processing and production. This kind of heat insulation strip cannot be compared with nylon 66 heat insulation strip reinforced by glass fiber in terms of mechanical strength, heat resistance and aging quality resistance. Moreover, since the industry standard of "heat insulation strip" for national construction is still in the final approval process, domestic nylon heat insulation strip carries out relevant performance testing with injection molding parts made by mixing nylon with common minerals, and the obtained test report is used as the performance test report of the finished heat insulation strip. The test data of this raw material can only represent its material performance, and the performance of finished products produced after hot extrusion, cooling and other processing technologies will greatly change.
(4) "opportunistic"
Some insulated aluminum doors and windows enterprises have fully studied and grasped PVC insulation strips, after the big performance difference between domestic nylon insulation strip and imported Nylon 66 insulation strip, a compromise scheme of both economy and relative insurance is adopted: the window frame aluminum profile adopts low quality and low price PVC or domestic nylon insulation strip, casement aluminum profile adopts high quality imported Nylon 66 heat insulation strip. They believe that the window frame aluminum profile is fixed on the wall, even if there is a quality risk, there will be no big problem, while the Casement aluminum profile is movable and bears stress alone, therefore, we cannot and dare not have quality risks.
(5) "filling up the number"
Some insulated aluminum doors and windows enterprises are studying people's psychology. People only care about the material quality of heat insulation strips, but seldom consider the alloy quality of the outer two layers of aluminum alloy. According to the national standard, the aluminum alloy of building profiles is 6063-brand alloy, however, some enterprises use substandard aluminum alloy for insulated aluminum composite doors and windows, resulting in casement. The corners of window frames are not tight, and it is difficult for doors and windows to be insulated and insulated.
2. Matters needing attention in the factory processing stage:
(1) Broken Bridge aluminum doors and windows processing and production should be carried out in the factory, not on the construction site, doors and windows production should meet the design and thermal insulation aluminum alloy doors and windows installation and acceptance requirements, heat cut-off aluminum alloy door and window frame should be installed firmly doors and windows should be pushed and pulled, open flexibly, there should be drainage holes at the window sill, and limit devices should be set. Fasteners shall conform to the provisions of relevant technical regulations, and the type, specification and performance of hardware shall conform to the provisions of current national standards.
(2) sliding window the drainage hole processing on the slide should follow the principle of inner fan outer hole and outer fan inner hole to ensure the sealing performance of doors and windows, especially the horizontal wool tops horizontal sliding window.
(3) Broken Bridge aluminum doors and windows before assembly, the end processing Burr should be removed, and the end node and the joint of the profile must adopt sealing measures such as waterproof adhesive to prevent the structure from leaking water.
(4) the structural assembly assembly of the hidden frame window must be manufactured and maintained in the purified room. The dust, oil stains and other dirt on the bonding surface of glass and aluminum frame must be removed with solvent; For every component or glass cleaned, the clean dry clean cloth should be replaced; The solvent should be poured on the wiping cloth, it is forbidden to wipe the cloth and contact the solvent bottle mouth. The glue injection must be full, without bubbles or leaks. The surface of the glue-line should be smooth and smooth; The remaining glue received by glue-line should not be reused.
3. Construction precautions:
(1) when installing window frames on each floor, the lines should be pulled horizontally and vertically, and the levels of each floor should be consistent and straight up and down.
(2) when the window frame is fixed with the wall, fix the upper frame first, then fix the frame, and use plastic expansion bolts to fix it.
(3) the inner cavity of the expansion joint between the frame and the opening adopts closed-cell foam, foaming agent and other elastic materials fill plug, and the surface is sealed with sealant.
At the same time, in the process of communication with many customers, we found that most customers have many blind spots and unknown confusion on how to choose insulation broken bridge aluminum profiles and how to distinguish the advantages and disadvantages, here are two points to talk about the choice of insulation broken bridge aluminum doors and windows profiles.
1. First of all, it depends on the materials used. The aluminum profiles used for good aluminum alloy doors and windows should conform to the relevant national standards and regulations in terms of thickness, strength and oxide film, and the wall thickness should be above 1.2mm, at least 108 Newton yield strength per square millimeter, 157 Newton tensile strength per square millimeter, and 10 micron thickness of oxide film. For those who do not meet the above standards, it must be aluminum alloy door and window profile inferior. Please choose carefully.
2. Secondly, the precision degree and professional technical ability of profile processing by door and window manufacturers are the key points worth considering by owners. Good manufacturers with good profiles and professional production and installation workers, only a good horse can match a good saddle! Aluminum alloy doors and windows finely processed, professional technology installation, can make its sealing performance is good, switch freely. On the contrary, technicians blindly choose aluminum profile series and specifications, make rough processing, and even replace milling with sawing and cutting. Installation and construction personnel do not install them as required, so the sealing performance of doors and windows produced in this way is poor, the switch is not smooth and cannot effectively block the wind and rain. In serious cases, the glass may burst. If it encounters strong wind and external force, it is easy to scrape or bump the push and pull part or glass, there is little damage to doors and windows, which hurts family members or pedestrians passing by. It is worrying!
3. Thirdly, it should be said that the owners are generally concerned about the price problem. In general, the price of good aluminum alloy doors and windows must be about 30% higher than that of inferior aluminum alloy doors and windows due to the high production cost. For some aluminum alloy doors and windows produced by using only 0.6-0.8mm thick aluminum profiles, the tensile strength and yield strength are far lower than the relevant national standards, and it is not safe to use. Therefore, as the saying goes, "You get what you pay for", owners should choose good profiles, and they must not covet a little cheaper.
4. Finally, owners must choose the products of regular Broken Bridge aluminum doors and windows manufacturers. Doors and windows that are not processed and produced according to standards are endless.
Doors and windows are like the "eyes" of home, and the eyes are our through your eyes! It can be seen that the selection and installation of home doors and windows are very important.
