When it comes to packaging, people have given different connotations. In the past, people thought that packaging was the use of appliances to contain items, or the operation of wrapping and bundling items, which merely played a role of accommodating items and facilitating access. This understanding is obviously one-sided. Now people have given a broader meaning to packaging. From a systemic point of view, it links the purpose, requirements, constituent elements, functions, and practical operations of packaging to form a complete concept.
The use of aluminum packaging materials has a short history, but because aluminum has its own unique characteristics, it has gradually increased as a food packaging material. The amount of aluminum used in aluminum foils, tubes and containers in China accounts for 2% of aluminum production. The main properties of aluminum are light weight, non-toxic, tasteless, beautiful, good processing performance, and shiny surface. In addition, because a dense alumina film can be formed on the surface of aluminum, it can effectively isolate the contact between aluminum and oxygen, and prevent further oxidation of the aluminum surface. However, it is corrosive in acid and alkali salt media, so almost all aluminum containers are used after spraying. Its strength is lower than steel, and its production cost is higher than steel, which is about five times that of steel. Therefore, aluminum is mainly used for sales packaging. For example, aluminum cans are mainly used for packaging of aerated drinks with a certain internal pressure. A small amount is used for transportation packaging.
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What is the difference between aluminum beverage can and tin can?
Iron cans and aluminum cans are currently widely used, each with its own advantages.Z、 However, the current market for tin cans is more popular and advantageous.
The cans are made of aluminum alloy, and the inner wall is coated with some organic coating to isolate the aluminum alloy from the beverage. During the processing, it is inevitable that the protective coating is not applied or is too thin, so that the aluminum alloy on the inner wall of the can comes into contact with the beverage. The aluminum element gradually dissolves in it, especially when the can is filled with acidic or alkaline beverages.
Canned beverages should not be used often and often, especially children with strong growth and poor elderly excretory function, it is better to drink less. Refining aluminum cans can cause pollution. Aluminum cans are passivated and cannot be dissolved by ordinary weak acids.
Aluminum cans are generally coated with a protective layer on the inner wall. Acid substances generally do not erode aluminum cans during the shelf life, but if the shelf life has passed, it may not be necessary. If it is stored for too long, an acidic substance reacts with aluminum to cause aluminum ions to enter the beverage in large quantities. Aluminum will accumulate too much in the body, which will cause Alzheimer’s disease.