Three-piece cans, also known as tinplate three-piece cans, are can-shaped packaging containers made from thin metal sheets such as tin-plated steel, chrome-plated steel, or aluminum alloys. These cans are made by pressing, bonding, or resistance welding. They consist of a body, base, and lid.
Three-piece cans were initially welded using soldering, but due to environmental protection requirements, they were gradually upgraded to resistance welding and laser welding, effectively reducing pollution risks and improving weld strength. The can body thickness is typically 0.2 to 0.4 mm, combining lightweight and mechanical properties. Three-piece cans offer excellent rigidity, adaptability, and high material efficiency, making them particularly suitable for applications requiring hot or cold processing or pressure resistance. Tinplate is a popular choice due to its corrosion resistance and ease of printing. The production process includes cutting and welding, recoating and drying, and crimping and assembly. In the beverage industry, three-piece cans, which do not require air support, have become the primary packaging format for non-carbonated products such as tea and protein drinks.
