Aluminum foil is a kind of aluminum rolled material. Aluminum foil is mainly about thickness. In the industry, aluminum products with a thickness less than 0.2mm are usually called aluminum foil. The edges are usually cut vertically and delivered in rolls. It has the advantages of moisture-proof, air-tight, light-shielding, abrasion resistance, fragrance retention, non-toxic and odorless. Its appearance has an elegant silver-white luster, and it is easy to process into beautiful patterns and patterns of various colors.
Aluminum foil production process flow:
Casting - uniform treatment - surface cutting - hot rolling - cold rolling - foil rolling - washing - annealing - cutting.
1. Casting: Production of castings and refined aluminum ingots, heating and melting into molten metal, and continuous casting into steel billets.
2. Uniform treatment: Keep the cast slab at high temperature for homogenization treatment to eliminate deformation and evenly distribute impurities.
3. Surface cutting: Cut the surface of the blank to a thickness of 8-10mm.
4. Hot rolling: Heat the steel billet to 500 ± 0 ℃ and then perform hot rolling. Roll it about 10 times and press it to a thickness of 3-5mm to form a hot coil.
5. Cold rolling: The hot coil is cold rolled at 80°C. After about 3 times, a 0.5-0.6mm original foil is formed.
6. Foil rolling: cold rolled into thin foil through high-precision rolling machine, aluminum can be rolled to a minimum of 5μ
7. Wash and rewind: wash off the rewinding oil and rewind into a roll.
8. Annealing: Heat-treating foil to provide special properties.
9. Cutting: Cut the foil edge and rolling direction.
Aluminum foil applications: food packaging, electrolytic capacitors, pharmaceutical packaging, aluminum foil lunch boxes, automobiles, flexible packaging, etc.