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1. Production Process
The production process can be divided into three core stages: melting, extrusion and surface treatment.
Phase 1: Melting and Casting (Raw Material Preparation)
1.Alloy formulation: Based on the required alloy grade (e.g., commonly used 6063-T5 or 6060-T66), mix aluminum ingots, intermetallic alloys (e.g., silicon or magnesium), and recycled aluminum in the specified proportions.
2.Molten and refining: The aluminum is heated to 700-750℃ in a melting furnace to melt, and the hydrogen and impurities in the molten aluminum are removed by degassing and slag removal processes to improve the purity of the aluminum melt.
3.Casting: The refined molten aluminum is poured into a mold and cooled with water to form a cylindrical aluminum rod (or "cast ingot").
Phase 2: Extrusion (Forming)
1.Heating: Preheat the aluminum rod and specialized mold separately before extrusion (aluminum rod approximately 450-500°C, mold approximately 400-450°C) to reduce deformation resistance.
2.Extrusion: The heated aluminum rod is fed into the die barrel of the extruder. Under immense pressure (thousands of tons), the rod is forced through the die's cross-section, forming a profile that matches the die's cross-sectional shape.
3.Online quenching: For heat-treated strengthened alloys (e.g., 6063), extruded profiles require rapid cooling via air or water to prepare for subsequent aging hardening.
4.Stretch straightening and fixed-length sawing: The profile is straightened by a stretching machine to eliminate bending and twisting, then sawn to the order length.
Phase 3: Surface Treatment (Enhancement and Decoration)
This is the critical step for imparting weather resistance and color to profiles, with the main processes being:
1.Pre-treatment: including degreasing, alkaline etching, and acid washing, to thoroughly clean the profile surface and form an activated matrix.
2.Anodizing: A hard, porous aluminum oxide film is formed on the surface of the profile through electrochemical action in the electrolyte. This process enables electrolytic coloring (e.g., champagne, bronze, black, etc.) or pore sealing treatment. Key characteristics include strong metallic luster and excellent wear resistance.
3.Electrophoretic Coating: A transparent or colored organic paint film is applied to anodized profiles using electrophoresis. The surface appears smooth and glossy, with enhanced corrosion resistance.
4.Powder coating: Dry powder coating is sprayed onto profiles via electrostatic adsorption, followed by high-temperature curing. It offers the widest range of color options, excellent scratch resistance, and high cost-effectiveness.
5.Fluorocarbon coating: Primarily employs PVDF fluorocarbon coatings, which are cured after spraying. It exhibits excellent UV resistance and chemical corrosion resistance, commonly used in high-end curtain walls and harsh environments.
6.Wood grain transfer printing: Building on powder coating technology, this method transfers wood grain patterns to profiles via thermal transfer, delivering a highly realistic wood grain effect with a warm, inviting visual appeal.
2.Core Advantages
Compared with traditional materials like steel, wood, and PVC, aluminum profiles offer the following distinct advantages:
High strength and light weight: Aluminum alloy boasts an excellent strength-to-weight ratio, resulting in doors and windows that are sturdy, durable, and lightweight. This makes them easy to transport and install, while reducing the load on building structures.
Outstanding corrosion resistance: The aluminum alloy surface naturally forms a dense oxide film, enhanced by advanced surface treatment techniques (e.g., anodizing, electrophoresis, spraying), providing exceptional weather resistance. It can withstand prolonged exposure to sunlight, rain, and wind erosion, with a service life lasting several decades.
Exceptional formability and precision: The extrusion process enables the production of cross-sectional profiles with highly complex shapes and exceptional dimensional accuracy, meeting the multifunctional and high-performance design demands of modern doors and windows.
Exceptional decorative appeal: Featuring diverse surface treatments and a wide range of colors (including solid, metallic, and wood grain finishes), the product boasts superior texture to cater to various architectural styles and personalized aesthetic preferences.
Environmentally friendly and recyclable: Aluminum alloy is a 100% recyclable green material, with energy consumption for recycling being only 5% of primary aluminum production, demonstrating significant environmental benefits.
Easy to maintain: smooth surface, resistant to dust accumulation, good stain resistance, and simple cleaning and maintenance.
3.Core Role
Aluminum profiles for doors and windows form the structural framework of modern building components, serving functions that extend far beyond basic support. These include:
Structural support and frame molding: Serving as the 'skeleton' of doors and windows, it provides strength and rigidity to the entire system, ensuring it can withstand its own weight, glass weight, and external loads such as wind pressure and impacts.
Fixed base installation: Provides precise and reliable mounting points for all components including glass, hardware (locks, hinges, pulleys), sealing strips, and window screens.
The performance carrier: Through precision cavity design and composite structures, it serves as the physical foundation for achieving critical performance characteristics such as airtightness, watertightness, sound insulation, and thermal insulation of doors and windows. For instance, multi-cavity structures and installation grooves for thermal insulation strips are directly integrated into the profiles.
Aesthetic function: Surface treatment of profiles (e.g. spraying, wood grain transfer) directly determines the appearance color and texture of doors and windows, which is an important part of the visual effect of building facade.
Functional division: Using profiles of different series and cross-sections (e.g., frames, sashes, mullions, trimmings, etc.) to clearly separate the opening and fixed parts of doors and windows, enabling various opening methods (hinged, sliding, inward-opening, etc.).
