Oceania Can Ltd.

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How tins are recycled in New Zealand

on May 28, 2024

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Ministry for the Environment

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Why Are Food Cans Coated with Tin and Not Zinc?

When you walk down the aisles of any grocery store, you're bound to see rows of shiny metal cans containing a variety of foods. These cans have been a staple of food storage for decades, ensuring the longevity and safety of the products within. But have you ever wondered why these cans are coated with tin and not zinc? This choice is rooted in a combination of chemistry, safety, and practicality. Image credit: Author with Ai and Wei Cheng The Chemistry Behind Tin Coatings Tin, a silvery-white metal, is highly resistant to corrosion and oxidation. When applied as a coating, it forms a thin layer over the steel or aluminum can, creating a barrier that protects the underlying metal from reacting with the food inside. This property is particularly crucial when it comes to acidic foods, such as tomatoes and fruits, which can corrode metals over time. Zinc, on the other hand, is also used as a protective coating for metals, particularly in the process known as galvanisation. Zinc protect...

What Types of Products Can Tin Cans Store?

Tin cans are a classic packaging choice capable of storing various types of products. Not only do they offer superior protective qualities, but they also excel in aesthetics and practicality. In this blog, we'll explore the types of products suitable for storage in tin cans, along with their advantages and applications. Image credit: Author with Ai and Wei Cheng Food: Tin cans are an ideal choice for storing food. They protect food from external factors such as oxygen, moisture, and light. Therefore, a variety of foods including dried fruits, candies, nuts, chocolates, and more can be safely stored in tin cans, preserving freshness and flavour. Cosmetics: Due to their excellent sealing and anti-corrosion properties, tin cans are also an ideal choice for storing cosmetics. Cosmetics often contain moisture and other perishable ingredients, requiring good sealing to maintain their quality and effectiveness. Therefore, various cosmetics such as creams, lipsticks, perfumes, and more ca...

Anatomy and Terminology of Tinplate cans

Tin Terminology Bead: A concave (interior bead) or convex (exterior bead) area, typically 1/8” wide, spanning the circumference of the tin to enhance its strength and stability. Body: Refers to a can without a lid; the base of a container. Cover: The lid or closure of a can. Curl: A section of tin folded inward to create a safe, rounded edge. Distortion Printing: A printing technique used for seamless tins, where artwork is intentionally distorted to fit onto flat metal and then adjusted as the tin is formed. Dome: A type of cover with a flat horizontal surface (top) that smoothly transitions into a vertical skirt. Drawn Can: Also known as a seamless tin, formed from a single piece of tin drawn to create the container. End: The bottom area of a tin, which can be attached by seaming or crimping. Four-Colour Process: A printing method utilizsing cyan, magenta, yellow, and black to produce a wide range of colours. Full Friction: A closure where a plug-style metal cap fits tightly inside...

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