Curtain wall aluminum profiles are the core structural materials of the building curtain wall system. With advantages such as lightweight and high strength, corrosion resistance, easy processing, and excellent decorative properties, they have become the mainstream choice for modern building facades, widely used in scenarios such as glass curtain walls, stone curtain walls, and metal plate curtain walls. The following provides detailed supplementary content from three dimensions: core characteristics, selection points, and application considerations. First, core performance enhancement points: Structural mechanical properties. Curtain wall aluminum profiles need to withstand multiple pressures such as wind load, seismic load, and panel self-weight. Therefore, the profile section design needs to include reinforced ribs and cavity structures. Common alloy grades are 6063-T5/T6 (6063 alloy has good plasticity and is easy to extrude, and T5/T6 strength is significantly improved after heat treatment), meeting the design standards for wind pressure resistance and deformation resistance of the curtain wall.
Weather resistance and corrosion resistance The natural oxide film on the surface of aluminum profiles is relatively thin, and artificial strengthening treatment is required to enhance its weather resistance. Different treatment processes have distinctly different applicable scenarios: Fluorocarbon spray coating (PVDF): The coating is resistant to ultraviolet rays and acid rain salt spray, with a warranty period of up to 25 years or more, suitable for high-rise buildings, coastal areas, or high-end commercial buildings.
Powder coating: rich in color, moderate in cost, and superior in weather resistance to anodizing, suitable for multi-story buildings in inland areas.
Anodizing: A uniform oxide film is formed on the surface, giving a fine texture. It is commonly used for indoor curtain walls or exterior facades where appearance is not highly critical.
Traditional curtain wall aluminum profiles with high thermal conductivity are prone to cause building energy loss due to their poor energy-saving and thermal insulation performance. The current mainstream solution is to use heat-insulating aluminum profiles - by using PA66 nylon insulation strips, the indoor and outdoor parts of the profile are disconnected, forming an insulation cavity. Coupled with Low-E glass, it can significantly reduce the building's heating and cooling energy consumption, meeting green building standards.
II. Key elements of selection: Matching profile units according to curtain wall types: Select profiles with complex cross-sections, integrated splicing notches, and waterproof cavities to meet the needs of factory prefabricated unit panels, with fluorocarbon spray coating treatment preferred.
Modular curtain wall: Select standardized mullion and transom profiles with simple cross-sections and strong universality. Powder coating or anodizing can meet the needs while controlling costs.
Hidden/semi-hidden frame curtain wall: It requires the use of specialized fixtures and pressure block profiles to ensure the glass panels are securely fixed, while concealing the profile contours to enhance the aesthetic appearance of the building.
For coastal areas with high salt spray environments, the preferred choice is fluorocarbon coating combined with 6063-T6 alloy profiles to enhance corrosion resistance.
In cold/hot regions: It is necessary to choose insulated aluminum profiles to reduce heat conduction loss.
High-rise buildings (≥100 meters): Products with thickened profile walls and reinforced rib designs must be selected through structural calculations to meet wind pressure resistance and seismic requirements.
III. Precautions for Application and Processing: Processing Requirements: Extrusion molding: It is necessary to control the mold precision to ensure that the deviation of the profile section size is within the national standard range (generally ≤±0.2mm).
Cutting and drilling: CNC precision machining is employed to prevent burrs and deformation on the surface of the profile, which could affect the installation tightness.
Surface treatment: Before spraying, it is necessary to thoroughly remove the oil stains and oxide layers on the surface of the profiles to ensure the adhesion of the coating. Color differences between different batches of profiles need to be controlled to avoid uneven appearance on the facade.
Key points for installation and maintenance: During installation, stainless steel connectors and bolts should be used to prevent electrochemical corrosion caused by contact between different metals.
Sealing treatment: Unitized curtain walls rely on the built-in waterproof cavity of the profiles, while componentized curtain walls require on-site application of neutral silicone sealant to ensure continuous and full sealant joints.
Post-maintenance: Regularly check whether the coating of the profiles has peeled off and whether the connectors are loose. In coastal areas, it is recommended to conduct anti-corrosion maintenance once every 5 years.
