The characteristics of aluminum window and door insulation of nylon Bridge
With the coming of the national industry standard, the competent department of the state will establish an authoritative testing institution with relevant professional testing equipment, which will provide qualitative and quantitative accurate test identification for thermal insulation bridge broken aluminum doors and windows and curtain wall insulation strips for the majority of construction industry colleagues. The following is a general intuitive identification method, only for the majority of technical personnel to give preliminary judgment on the site.
1. Judging from the appearance. The broken bridge aluminum nylon heat insulation strip is black and Matt. Usually, the laser spray code with technoform bautec trademark, product specification, production batch number and other contents are marked on the strip every 60-80 cm. The whole strip is smooth and smooth without shrinkage, porosity, scratch and mold extrusion marks. The special luster of minerals (glass fiber distribution) can be seen through light inspection, and there is no parting line mark on the end face of heat insulation strip head; Other imported or domestic nylon heat insulation strips are gray black or dark black, without any trademark mark, and the strip body is relatively rough. The mold extrusion trace and parting line trace of the head end face are obvious, and there are shrinkage porosity and porosity; while the PVC heat insulation strip is bright black, without any trademark logo, the strip body is rough, the mold extrusion trace is obvious, there are a large number of shrinkage porosity, head size asymmetry, irregular 。
2. Breaking experiment. 25 cm sample of type I was taken for manual breaking test, When the aluminum nylon heat insulation strip is bent, it can feel good toughness and strength, and it will not break when it is bent to the two ends, even if the fracture is slow fracture; other imported or domestic nylon heat insulation strips have obvious brittleness, and when there is a certain distance between the two ends, it will produce multi-stage burst phenomenon (caused by uneven glass fiber particles), or the toughness is obvious, and repeated bending does not occur for many times Broken (caused by insufficient glass fiber content); PVC insulation strip is very soft, basic no strength, repeated bending will not break.
3. Ordinary ignition experiment. It is difficult to ignite the broken bridge aluminum nylon heat insulation strip, which shows light yellow flame when burning, and PVC heat insulation strip is inflammable, and presents blue flame when burning, and releases a lot of pungent black smoke.
4. Complete combustion experiment at high temperature. Uniform black fiber deposition can be seen after complete combustion of aluminum nylon insulation strip at high temperature; uneven fiber deposition or complete combustion with no fiber deposition is observed after complete combustion of other imported or domestic nylon insulation strips at high temperature; there is no deposition after thorough combustion of PVC heat insulation strip at high temperature.
5. Dimensional accuracy. By using vernier caliper (micrometer is more accurate), it can be found that the dimension deviation of aluminum nylon heat insulation strip is less than 0.1 mm regardless of different batches or different parts of the same heat insulation strip, and the parallelism standard is standard; the dimensional deviation of different batches of other domestic nylon heat insulation strips or PVC heat insulation strips or different parts of the same heat insulation strip is at least 0.1 Moreover, the parallelism of the upper and lower ends of the heat insulation strip is poor, which can not guarantee the stability of the composite strip, which is easy to cause the internal distortion stress, thus forming the quality hidden danger of the heat insulation doors and windows processed by this kind of heat insulation profile.