a can, is a container for the distribution or storage of goods, composed of thin metal. Many cans require opening by cutting the "end" open; others have removable covers. Cans hold diverse contents: foods, beverages, oil, chemicals, etc. Steel cans are made of tinplate (tin-coated steel) or of tin-free steel. In some dialects, even aluminium cans are called "tin cans".
Generally the cans are used for the preservation of multiple foods. Given the characteristics of metal containers are ideal for conservation and subsequent human consumption. Among the foods that can be found in cans, include: seafood, fish, meat, fruits, vegetables, oil, olives. etc.
The cans can also be used for drinks, has a relatively recent origin. The first can with flat lid was launched in 1935, but it is not until the introduction of the easy-opening lid in 1965 when it starts its commercial takeoff. At the end of the 1980s, the non-detachable ring stay-on tab, which is the most used today, is presented. The boom of the can as a beverage container is due to its numerous advantages for distribution and consumption.
Canned foods refer to foods that meet the requirements of food processing, roll-out, canning, sealing, sterilization, cooling, and achieving commercial sterilization requirements, in addition to room temperature and can be stored long-term.
The production of canned food has two key characteristics: sealing and sterilization.
There are rumors in the market that canned foods use vacuum wrappers or preservatives to achieve the effect of long-term storage. In fact, canned food packaged first sealed, and then a strict sterilization process to achieve commercial sterile. It is virtually impossible for cans to use vacuum technology to prevent bacterial growth.