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The production of aluminum roofing sheets involves precise process control to ensure thickness uniformity, surface quality, and performance stability. The main steps are as follows:
High-quality aluminum ingots or alloy billets (typically 1xxx, 3xxx, or 5xxx series) are selected based on the intended application. For example, 5xxx series (Al-Mg alloy) is preferred for coastal areas due to its superior corrosion resistance.
The aluminum billets are heated to 400–500°C and rolled into thick sheets (1–5mm) using hot rolling mills. This step refines the grain structure and improves the material's formability.
The hot-rolled sheets are further rolled at room temperature to reduce the thickness to the target range (0.2–1.2mm for roofing applications). Cold rolling enhances the sheet's strength, surface smoothness, and dimensional precision.
PVDF (fluorocarbon) coating, polyester coating, or acrylic coating is applied via roller coating to improve weather resistance and aesthetics.
The sheets are treated with electrolysis to form a thicker oxide film (5–20μm) on the surface, enhancing corrosion resistance and allowing for dyeing into various colors.
The sheets are passed through embossing rolls to create decorative patterns, which also improve slip resistance and hide minor surface defects.
The treated sheets are cut into standard sizes (e.g., 1000mm × 2000mm, 1220mm × 2440mm) or custom lengths. They are then packaged with moisture-proof film and cardboard to prevent scratches and damage during transportation.
| Specification Category | Detailed Parameters | Typical Alloys | Typical Applications | Quality Control Requirements |
|---|---|---|---|---|
| Thickness | Thin: 0.2mm – 0.5mm | 1060, 3003 | Residential awnings, small sheds, temporary buildings | Thickness deviation ≤ ±0.02mm, no pinholes |
| Medium: 0.5mm – 0.8mm | 3003, 5052 | Residential roofs, commercial buildings (shops, offices), agricultural greenhouses | Thickness deviation ≤ ±0.03mm, tensile strength ≥ 150MPa | |
| Thick: 0.8mm – 1.2mm | 5052, 5083 | Industrial workshops, large-span buildings, coastal area roofs | Thickness deviation ≤ ±0.04mm, elongation ≥ 5% | |
| Surface Treatment | PVDF Coated | 3003, 5052 | Coastal buildings, high-end commercial buildings, industrial areas | Coating thickness 20–30μm, weather resistance ≥ 20 years |
| Polyester Coated | 1060, 3003 | Residential roofs, inland commercial buildings | Coating thickness 15–25μm, weather resistance ≥ 10 years | |
| Anodized / Embossed | 1060, 3003 | Decorative roofs, awnings, cultural buildings | Anodized film thickness 8–15μm, pattern uniformity | |
| Size (Width × Length) | Standard Size: 1000mm × 2000mm, 1220mm × 2440mm, 1250mm × 3000mm | 1060, 3003, 5052 | Batch construction of residential and commercial buildings | Size deviation ≤ ±5mm, flat surface without waves |
| Custom Size: Width 500–1500mm, Length up to 6000mm | 3003, 5052, 5083 | Special-shaped roofs, large-span industrial buildings | No creases, surface scratch depth ≤ 0.01mm | |
| Alloy Types | 1xxx Series (1060, 1100) | 1060 (99.6% Al) | Indoor awnings, temporary buildings, decorative roofs | Good corrosion resistance, low strength |
| 3xxx Series (3003) | 3003 (Al-Mn) | Residential roofs, commercial buildings, agricultural greenhouses | Enhanced strength vs. 1xxx, excellent weldability | |
| 5xxx Series (5052, 5083) | 5052 (Al-Mg), 5083 (Al-Mg-Mn) | Coastal buildings, industrial workshops, high-wind areas | Superior corrosion resistance, high tensile strength |
