How are cans made?

In 1959, ERNIE.C.FRAZE of DRT Company in Teton, Ohio, USA (Aimar Clinan Fraze) invented the pop-top can, that is, the material of the lid itself is processed to form a rivet, jacket The last tab is re-riveted and matched with the appropriate notches to complete the lid. This genius invention made a historic breakthrough in metal containers after 50 years of long development. At the same time, it also laid a solid foundation for the development of the canning and beverage industry. Cans originated in the United States and prevailed in the United States.

How are cans made?

There are two kinds of materials for making cans: one is aluminum, and the other is tinplate. The consumption of aluminum metal materials for packaging containers in the United States reached 1.9992 million tons in 1998, an increase of 2.24% over 1997, making it the second largest consumer market, accounting for 21.6% of the annual aluminum consumption. In the United States, aluminum sheets are always used as materials for cans, and about 40% of aluminum sheets are used in the production of cans every year.

Aluminum's strong rival in the packaging industry comes from PET material. PET material can be made into a strange appearance through injection molding, while aluminum material is relatively difficult, but there is a big difference in the price of the two materials. PET is affected by oil prices. impact, while aluminum can be used through its own recycling cycle, reducing material costs and being valued by environmental groups.

Environmentalists believe that aluminum cans are more environmentally friendly than other packaging containers. As far as their containers are concerned, repeated recycling reduces environmental pollution; as far as the materials used are concerned, the repeated use of aluminum can effectively save resources and keep the earth The environment, and other packaging containers such as plastics and PET materials that are generally prevalent, all originate from oil, and the continuous exploitation of oil will cause the depletion of resources.

Pop cans have the advantages of light weight, small size, not easy to break, and easy to carry, so they are favored by people. But scientists have found that cans contain 3-6 times more aluminum than bottled drinks. This is because, during the processing of cans, it is inevitable that some protective coatings are not applied, or are too thin, causing the aluminum alloy on the inner wall of the can to come into contact with the beverage. The aluminum element can not only react with acid to form aluminum salt, but also react with alkali to form meta-aluminate. This leads to a gradual increase in the aluminium content of the beverage. Excessive intake of aluminum is harmful to the human body. The World Health Organization officially identified aluminum as a food contaminant in 1988. Therefore, many developed countries have restricted the production of cans.

After being eaten by humans, aluminum cannot be excreted from the body, and it will be deposited in the human body forever. Aluminum is not a trace element needed by the human body. Excessive intake will affect the absorption of iron, calcium and other components by the human body, resulting in anemia and osteoporosis. The main toxic and side effects are that alum can kill brain cells and cause brain atrophy, premature brain atrophy, and osteoporosis. Dementia and other symptoms. China banned the use of aluminum cutlery as early as the 1980s.

Excessive intake of aluminum will cause the following harm to the human body: lead to senile dementia; may cause osteoporosis, prone to fractures; reduce the immune function of the body; lead to non-iron deficiency anemia.

In addition, low concentrations of aluminum can also accumulate, which can cause varying degrees of damage to the nervous system, bones, liver, kidney, heart, and immune system.

To sum up, it is not advisable to drink canned beverages often or more, especially for children in the period of vigorous growth and development and the elderly with poor excretory function, it is better to drink less. Usually drink beverages should try to choose glass bottles or soft packaged beverages.