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Home > Program and data > Technical dataMore and more people begin to focus on thermal insulation properties of window. From wood window、iron window to plastic-steel doors and windows and colors al-alloy door & window, then to broken bridge aluminium door and window, the style is constantly changing. As just emerged in recent years and has been called the 5th generation new thermal insulation doors and windows. What’s the unique feature of broken bridge aluminium door and window? Quality stability? How should the consumer select and purchase?
Warm in winter and cool in summer on the basis of energy saving.
It is better than plastic steel window, It is really warm in winter and cool in summer. Recently, when talk about the difference between plastic steel window and aluminium alloy window, industry insiders said so.
The origin of broken bridge: the inside and outside structure was made up of aluminium alloy profiles. The middle is made up of low thermal conductivity properties of non-metallic thermal insulation materials, these materials connected to “thermal insulation bridge”. Disconnected aluminium profile and form broken bridge.
Compare with traditional plastic steel window, the main change of broken bridge aluminium window lies in thermal insulation material and hollow glass. Why does it mean real “warm in winter and cool in summer”? Beijing University of Technology, College of Architecture and Urban Planning, professor Wang Shujing explains that, “ coefficient of heat conduction” is the key word to understand. It means the size of the heat transfer capability. If the coefficient of heat conduction is big, indicating poor insulation properties of window. Because of greater heat conductivity of Aluminium alloy than hollow glass, heat is easier to enter into the room along aluminium alloy. However, heat insulation strip is in the middle of broken bridge aluminimum profile, which can effectively prevent heat transfer, thereby to realize energy-saving.
It is known that the coefficient of heat conduction Kvalue of thermal insulation broken bridge aluminium door and window is under 3w/m2·K, what’s more, heat conductivity is reduced by 40%-70% than that of non insulated aluminum alloy profiles door and window, heating costs reduced by 30% approximately, sound insulation above 35 decibel, good water tightness and good gas tightness, all reached the national A1 class window standard.
Now, because of good heat prevention and heat insulation performance, thermal insulation broken bridge aluminium door and window is gradually being widely used in winter cold areas like northeast, northwest, north China etc.
Industry insiders indicate that, there is a far away from coefficient of linear expansion between PVC and aluminium alloy. What’s more, PVC has many defects like low intensity, poor heat resistance and poor aging resistance etc. After use the heat insulation door and window which was made by PVC heat insulating strip, the PVC heat insulating strip would become loose even break away because of heat expansion and cold contraction, it will cause form loose, deformation even completely loose, break away. In addition to pay attention to quality of heat insulation materials, we should also consider inside and outside aluminum alloy and the quality of hollow glass. As < Aluminium alloy profile 1th part: base material>which was carried out on 9th, 2009 stated: Profile minimum nominal wall thickness should no less than 1.20mm, except for Elastic assemblies profile like mound layer, gland and pinch plate etc. 6063alloy is the national standard aluminium architectural profile, in case of quality problem because of aluminium alloy strength and stiffness insufficient.
Thermal insulation material is critical to quality.
Thermal insulation material is also called heat insulation strip, the quality of heat insulation strip is a key point to decide whether this kind of doors and windows could reach thermal insulation effect. In《rigid plastics thermal insulation strip used in building》,（JG/T174-2005）there are detailed stipulations on rigid plastics thermal insulation strip used in extruding molding architecture aluminium alloy profile. It requires thermal insulation materials must have the similar performance of aluminium alloy profiles , like strength of extension、bending strength、expansion coefficient and elasticity modulus. Or the heat insulation bridge would be broken and damaged. PA66 is the base material of thermal insulation strip, however, recently in the market, PA66 was replaced by PVC、nylon6 and other materials. If the middle thermal insulation material is PVC, heat insulating property generally could meet requirement, however, the strength could not. It is easy to break and cause quality problems.
Aluminium alloy thermal insulation profile is composite sections of thermal insulation and it is made of thermal insulation material connected with aluminium alloy profiles. It is composed of aluminium alloy profiles and thermal insulation material. Aluminium alloy thermal insulation profile could be classified into two categories by means of complex method, one is penetrate bar aluminium alloy type of thermal insulation profile, penetrate linearity thermal insulation material into penetrate bar groove of aluminium alloy profiles and make it firm bite by aluminium alloy profiles to compound into thermal insulation profile. The other is pouring type of aluminium alloy thermal insulation profile, the liquid heat insulation material is injected into the aluminium alloy profiles and curing. Break mental connecting by means of removal of temporary connection bridge in pouring spout of aluminium alloy thermal insulation profile, then make the two parts of aluminum alloy profile combined together by thermal insulation material.
The inspect of aluminium alloy thermal insulation profile generally divided into three parts: they are inspection of aluminium alloy profile, inspection of thermal insulation material and inspection of aluminium alloy thermal insulation profile after composite. The inspection items of aluminium alloy thermal insulation profile after composite are dimensional deviation, surface quality, longitudinal shear test, horizontal tensile test, torsion test, High temperature lasting load test, heat cycle test. Dimensional deviation, surface quality and longitudinal shear test is a project that must be checked for each batch. Horizontal tensile test, torsion test, High temperature lasting load test and heat cycle test are periodical inspection items, that is formal check.
aluminium alloy thermal insulation profile commonly used performance test equipment and apparatus:
1、Special shear testing machine for shearing test
2、Tensile (or hydraulic universal) testing machine for tensile 、shearing test.
3、Test chamber for high temperature, low temperature shear, tensile and thermal cycling test.
4、Test chamber for high and low temperature lasting load testing
5、Special test fixture for heat insulation material shear, horizontal tension, torsion test and so on.
