【China Aluminum Industry Network】 Composite Aluminum Profile is a new type of doors, windows and curtain wall building materials combined with aluminum alloy and polymer insulation materials. Through this combination, a heat-insulating sandwich is formed at the center of the aluminum alloy profile, thereby achieving the purpose of “insulation aluminum profiles”. Insulated bridge composite aluminum profiles are mainly used in both strip and cast type.

The strip-type composite aluminum profile is formed by connecting two parts of the aluminum profile with two heat insulation strips, so as to prevent the conduction of heat inside and outside the aluminum profile and achieve the purpose of energy saving. It originated in Europe and it is 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. The current standard insulation bar is PA66, which has two production methods: hard top and traction. 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 appearance of beauty and precision, using PA66 nylon plus ultra-fine glass fiber is a common feature of foreign insulation bars (rarely use other materials). Due to the use of ultrafine glass fiber, the tensile strength is only 60N/mm, and it is expensive. The domestic PA66 plus ordinary glass fiber as the main direction of attack has 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.

Casting compound aluminum heat insulation and energy-saving technology originated in the United States. Since the late 1930s of the last century, with the wide use of aluminum doors and windows, some American innovative door and window designers began to consider the problem of poor thermal insulation of aluminum profiles. Effectively solve the energy saving technology of aluminum profiles. In general, these techniques use a mixture of high-molecular polymers and aluminum profiles. The cast-in-place complex aluminum profile technology represented by American Yasong Company is formed by pouring and forming a polyurethane heat-insulating bridge to bond the inside and outside of the aluminum profile into a whole, so as to achieve the purpose of environmental protection and energy conservation. Its performance, process, cost, etc. are very ideal.

Now we will make the following comparative analysis of casting and wear strip composite aluminum one. Basic performance comparison (a) strength polyurethane casting composite aluminum aluminum extrusions due to one-time extrusion, this reduces the process defects, plus a one-time polyurethane poured into the aluminum profile insulation tank, curing polyurethane thermal insulation bridge, Due to the high adhesiveness of polyurethane, the polyurethane heat-insulated bridge is completely integrated with the aluminum profile and does not require pressure bonding, so the strength of the aluminum material is high. The strength of the polyurethane itself is relatively high, and the cross-sectional area of ​​the heat-insulating bridge is large, so the strength of the cast-in-place heat-insulating bridge is greater than that of the stringer. In this way, the overall strength of the cast composite aluminum profile is greater than that of the stringer type.

The strip-shaped composite aluminum profile itself is formed through two extrusions, and then the heat insulation strip is inserted into the process slot of two aluminum profiles and then rolled. The internal structure of the material is changed, and stress is generated so that the overall strength of the profile is poor, and even obvious cracks are made to make it a waste product.

(B) profile cross-sectional area Polyurethane casting composite aluminum structure compact, small and beautiful; wear strips of composite aluminum due to open teeth, rolling process, its cross-sectional area is very large, looks bloated, hypertrophy.

(3)Composite aluminum profiles with the same pattern length and same length as the profile. The cross-bar type has a larger cross-sectional area than the polyurethane casting type, and the weight/meter ratio is larger than that of the cast type. The rate is less than that of cast-type composite aluminum [about 13%], and the production of 1 square meter of doors and windows consumes about 1 kilogram more. The use of cast insulated aluminum profiles for doors and windows, saving 25 yuan per square meter cost of aluminum. If a door and window factory makes 10,000 square meters of doors and windows every year, it can save 250,000 yuan.

(four) plasticity (window)

Today's doors and windows are diverse, and there are more and more shaped windows and doors. Making profiled doors and windows requires the plasticity of the profile to be better. Polyurethane cast compound aluminum profiles can be machined into doors and windows of any shape, including 360-degree arcs. Due to the insecure connection between the heat insulating strip and the aluminum profile, when the aluminum profile is greatly deformed, the heat insulating strip easily escapes from the connecting groove of the aluminum profile, so that its window shape is limited.

(5) Heat-insulated polyurethane cast compound aluminum profiles have performed satisfactorily in long-term tests and practices. In the case of outdoor -20°C, the interior still maintains around 18°C. When wearing a strip type outside -20?c, the room is kept at 8?c. It can be seen that the pouring type is better than the string-type heat insulation.

(6) The aluminum part of the inside and outside two-color strip-shaped composite aluminum profiles is extruded twice. The inner and outer parts of the aluminum profile are separately treated on the surface, and then the two-color structure can be completed by opening the teeth, wearing the strips, and rolling. Casting two-color forming process: 1. The internal and external parts of the aluminum profile are treated separately. 2. Make the necessary connection, pouring, and cutting of the aluminum profiles.

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