Cans

Cans are sealed metal containers used to store foods and beverages. They are typically made of aluminum or tinplate steel, with an interior polymer coating to prevent corrosion or chemical interaction with the contents. Cans come in a variety of sizes, with beverage cans commonly holding about 250 to 355 milliliters (often labeled 8 to 12 fluid ounces), and larger cans used for foods or multipacks.

Most beverage cans are cylindrical with a removable end and a separate top or opening lid that is joined to the body by a double seam. Opening mechanisms have evolved from early pull-tabs and key-opened designs to modern stay-on tabs, which stay attached after opening to reduce litter. The lids for foods may be opened with pop-top or similar mechanisms on certain products, and resealing is generally not provided for most canned beverages.

Manufacturing: Cans are formed from rolled metal sheets. The body is shaped by drawing and ironing processes, then coated on the interior. Ends are formed separately and attached by a high-strength double seam. Aluminum cans are favored for their light weight and corrosion resistance; steel cans are used for some foods and for cost concerns.

Recycling and usage: Cans are widely recycled; aluminum recycling saves energy and raw materials; steel cans also recycle well. The recycling rate varies by region but is typically high for beverage cans; recycling programs encourage consumer recycling; environmental impacts include mining, energy use, and liner materials; advancements aim to reduce material use and improve recyclability.