[China Aluminum Industry Network] Brief introduction of strip-type composite aluminum strip The strip-type composite aluminum strip is formed by connecting two parts of aluminum strip inside and outside by two heat insulation strips, so as to prevent the conduction of heat inside and outside the aluminum strip and achieve energy saving. .
It originated in Europe and aluminum strips are suitable for the construction of low-rise windows. This is the reason why it was born and survived in Europe. But its strength, process, cost, etc. are not ideal. At present, the regular heat insulation strips are PA66 aluminum rods, and there are two production methods for them: the hard top method and the traction method. The hard-top method has a tight structure and a good appearance but is relatively "brittle." The toughness produced by the traction method is good but the appearance is poor, and the side has a process depression. In order to pursue the surface appearance and accuracy of aluminum tubes, the use of PA66 nylon plus ultra-fine glass fiber is a common feature of foreign insulation strips (rarely using other materials). Due to the use of ultrafine glass fiber, the tensile strength is only 60N/mm, and it is expensive. Aluminum PA66 and ordinary glass fiber as the main attack direction in China have achieved certain breakthroughs. However, some people use PA6, ABS (styrene-acrylonitrile-butadiene terpolymer), PP (polypropylene), shoddy. Some people even use general-purpose plastics such as PVC, which can only be used as non-structural materials, instead of engineering plastic PA66 to make insulation strips, and some use mineral fibers and stone powder that seriously affect environmental protection. The main raw material of PVC insulation strip is polyvinyl chloride resin. Due to its low strength, large coefficient of thermal expansion, and toxicity, the relevant authorities of the country have clearly stipulated that the use of PVC for the production of aluminum profile insulation strips is not allowed.
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