The construction of aluminum labels varies depending on the application and process, but the core structure typically includes a substrate layer, a graphic layer, a surface treatment layer, and an adhesive layer (if applicable).
Substrate: Made of 5052 or 6061 aluminum alloy, typically 0.3–3.0 mm thick, with a density of approximately 2.7 g/cm³, possessing lightweight, corrosion-resistant, and easy-to-process characteristics.
Anodizing: Forms a 10–25 μm thick aluminum oxide film, achieving a Mohs hardness of 9, enhancing wear and corrosion resistance. Surface finishing techniques include high-gloss cutting, wire drawing, sandblasting, and etching.
Screen printing: Uses metallic ink, which adheres firmly after high-temperature baking.
Etching: Engraving using chemical solutions, with depth controlled between 0.05–0.5 mm and a tolerance of ±0.1 mm.
Laser engraving or heat transfer: Used for high-precision graphics.
Adhesive layer (optional): For self-adhesive labels, pressure-sensitive adhesive is applied to the back, covered with release paper.