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There exist various methods for packing and preserving food, including canning, pickling, drying, freeze-drying, among others. These techniques often involve storing food in containers like jars and cans.
Canning has emerged as the predominant method of food preservation due to its efficiency and recyclability. Tin and aluminum, both resistant to corrosion and entirely recyclable, are commonly used in packaging food, ensuring its safety and prolonged shelf life. Among food packaging options, tin cans are widely utilised.
Types of Tin Cans for Food Packaging
Two-Piece Tin Cans
Two-piece tin cans comprise a cylindrical body and bottom part joined with a lid. These cans are typically formed through a process called metal drawing, where a single piece of metal is compressed and shaped into a cylinder, with a lid added on top. Two-piece cans vary depending on the drawing process.
Single-drawn cans, produced in a single drawing operation, are commonly used for items like tuna, sardines, and ready-to-eat meals. Drawn & Redrawn cans, taller and larger, are employed for storing significant portions of food like salmon and canned fruit. These cans undergo multiple drawing operations, known as draw and redraw, to achieve the desired shape.
Drawn and Wall-Ironed (DWI) cans, typically used for beverages and beers, undergo wall ironing to increase length and flatten the wall thickness. Drawn and Ironed (DI) cans are a variation used for packaging food products and pet food, though they are not decorated like DWI cans.
Three-Piece Tin Cans
Traditional three-piece cans consist of a body, lid, and bottom, allowing opening at both ends. These cans are common for food packaging and are also used for non-carbonated beverages.
Other Materials Used in Food Packaging Cans
Tin-plated steel or metal
Steel cans are coated with tin plating to prevent corrosion and food contamination. While effective, these cans are heavier and more expensive due to the steel base and tin coating.
Modern Tin
Modern cans often utilise tin and other soft, non-corrosive metals due to their resistance to corrosion and recyclability. Tin, being recyclable and reusable, is widely recommended for can packaging.