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Why are cans made of aluminum?

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cans are made of aluminum alloy, and their inner walls are coated with some organic coatings to isolate the aluminum alloy from beverages. In the process of processing, it is inevitable that the protective coating is not applied or too thin in some places, so that the aluminum alloy on the inner wall of the tank comes into contact with the beverage. Over time, aluminum gradually melted

especially when there are acidic or alkaline drinks in the tank. It can be seen that cans should not be drunk often or more, especially for children with vigorous growth and development and the elderly with poor excretion function. Aluminum cans are generally coated with a protective layer on the inner wall. Acid substances generally will not erode the aluminum cans within the shelf life, but it may not be after the shelf life

extended data:


precautions for using aluminum products:

1. Most families have used iron pot for cooking. Using iron pot for cooking is beneficial to health, because iron is very good for preventing human anemia. However, a small number of families still use aluminum pot for cooking. Aluminum pot cooking is not conducive to health, because the melting point of aluminum is relatively low. When cooking, the aluminum element in aluminum pot will enter the food, which is harmful to human health

2. In daily life, try not to use aluminum tableware, because aluminum ions can easily escape from aluminum tableware and enter food in a relatively high temperature environment. Especially when aluminum products come into contact with iron tableware, it will promote the release of aluminum ions. After eating food containing too much aluminum, it will affect your health

3. When making pickles, it’s best not to use aluminum products, because vinegar, salt and other spices will be put into pickles. Strong acid and strong alkali have corrosive effect on aluminum products. When aluminum in aluminum products enters food, it will have an impact on health

reference source: Baidu Encyclopedia – cans

reference source: Baidu Encyclopedia – aluminum products

I hope it can help you

the aluminum pop-up can and two-piece can packaging (commonly known as “two-piece can” and “pop-up can”) popular in the beer and beverage consumer goods market began in 1963 when Alcoa launched the beer and beverage pop-up can packaging with alloy aluminum pop-up cover. So far, the world’s annual output of two-piece cans with easy opening cover is about 260 billion, of which 300 million are produced in the United States every day, with an annual output of more than 100 billion

this kind of safe, light and beautiful liquid food packaging is welcomed by consumers once it is on the market. Most of its total amount is used for the packaging of various beverages all over the world, and the rest is used for beer packaging. In the annual output of 24 million tons of beer in the United States, more than 50% are packaged in aluminum two-piece cans (55% in 1999), that is, beer equivalent to half of the total output in the American beer market is sold through aluminum cans. For nearly half a century, the majority of American consumers have accepted this kind of safe, light and beautiful packaging

Aluminum two-piece cans with easy opening lid are popular in liquid food packaging, especially in beer packaging, which has more momentum than traditional glass bottle packaging beer. Its development process is very worthy of serious summary. Especially at a time when we are vigorously promoting the packaging of beer in polyester bottles, we can change a perspective, that is, we can make an all-round comparison between polyester bottles and aluminum cans without sticking to the comparison between polyester bottles and traditional glass bottles. I’m afraid there will be more comparability between them, so we can further infer that since the beer packaged in cans is feasible from then to now, the beer packaged in polyester bottles must be feasible. This has to be convincing, and there is no lack of more theoretical and practical enlightenment for the promotion of polyester bottle packaged beer

the original beverage packaging cans were made of steel, which was later improved to aluminum. The material density of aluminum is 2.7, which is only 1 /3 of that of steel. Its extensibility is better. After the successful trial production of drawing & ironing (DI tank for short), it is possible to realize that the tank height is greater than the tank diameter (H is greater than D), so it has popularization value in the packaging of liquid food industry. However, since aluminum is located at the end of the sequence of the periodic table, once it contacts with other metals, the interface will be corroded due to the bimetallic potential difference. At the same time, it has certain instability for acidic beverages, including beer. Therefore, the coating in the tank has become a shielding structure that must be considered. At present, the finalized packaging materials are two cans, which are internally coated with 130mg epoxy resin for packaging beer (CO2 content is 5g /L), and internally coated with 180mg epoxy amino acid for packaging strong corrosion beverage (CO2 content is 8g /L). With the improvement and perfection of environmental protection standards, the structure of the easy to pull cover is also changed from the disposable pull ring (stay-ontab) to the combined button type (). The large-scale popularization and use of easy open cover two-piece can is closely related to the completeness and effectiveness of its recycling system, which is the result of the unremitting efforts of Alcoa for nearly half a century. The result is that only those packaging materials that effectively enter the resource recycling and circular economy system and meet the requirements of sustainable development are truly viable and can be accepted and respected by the public. This is the behavior guide that should be regarded as the highest purpose in today’s action to promote polyester bottle packaged beer

in a German beer manual, many advantages of cans are listed:

· not easy to break

· the mass is much lighter than that of glass bottles (355ml cans weigh only 14g)

· disposable packaging, effective recycling of raw materials

· can stack well

· opaque and light free taste

· packaged beer can be pasteurized after being sealed

to be fair, all the advantages of the above pop can packaging beer are the combination of polyester bottles, and polyester bottle packaging beer has many advantages that the latter does not have, such as:

· packaging equipment, which is used for polyester bottles, can basically use the existing glass bottle packaging line with necessary design changes (in fact, there is a glass plastic bottle dual-purpose bottling line), The pop can packaging must spend a lot of money to re purchase special packaging equipment

· with the same fixed liquid level filling, polyester bottles and glass bottles can have the same filling accuracy, while the filling accuracy of easy to pull cans is much lower because the diameter of the can body is much larger than that of the bottleneck

· in the filling process, polyester bottles have the same small opening area as glass bottles. Even if 209 is changed to 206 cover type, the opening area of can mouth is much larger than that of bottle packaging (directly proportional to the square of can diameter). Therefore, the oxygen increasing capacity of beer packed in cans is much higher than that of bottled beer

· polyester bottles and cans can not withstand vacuum pumping, and both use CO2 replacement to obtain low oxygenation, but polyester bottles can be filled stably under the liquid level of long tubes. People in the beer industry have always believed that this is an effective filling method with low oxygen content

· the change of polyester bottle type meets the market fashion,
with more variety and convenience

you can also list many advantages of polyester bottles over cans. The conclusion is that the cost performance of polyester bottle packaged beer is much better than that of pop can packaged beer

the manufacturing of domestic aluminum two-piece cans began in 1985, with an investment of US $300 million and the introduction of 13 can production lines, with an annual production capacity of 11 billion aluminum cans. In 2003, there were 2 billion cans for tinned beer, about 600000 tons (kiloliters), accounting for 2.3% of the total beer production in China, with a year-on-year increase of more than 8%, which is higher than the average annual growth rate of 5 ~ 6%, reflecting the domestic safe, lightweight and beautiful one-time packaging market, which is expanding day by day. Can packaging beer is feasible, polyester bottle packaging beer must be feasible!

because it is light, easy to transport and easy to melt. Because aluminum has a lower melting point than most other metals

aluminum is a good container for food,

because it’s Lightweight

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