How are cans preserved?
31 years old
2018-06-29
Is there any preservative added to the canned food that I usually buy overtime, and how is it preserved without it?
1 Answer These messages are for reference only
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BY Mamie Doris 2018-06-29The reason why the cans can be stored for a long time without deterioration is entirely due to the sealed container and strict sterilization, which has nothing to do with preservatives. Canned food is actually not mysterious, and the principle of making canned food is also very simple: first fully heat the raw materials to kill all the microorganisms; at the same time, fully heat and sterilize the packaging cans; then put the sterile food in a sterile container and take advantage of the heat Sealed; finally heated and sterilized. After cooling, the volume of air in the top space of the container shrinks, which will produce negative pressure. The originally sealed bottle will not be opened, and the outside bacteria cannot enter.6
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