Canned food is a food processing method that can be preserved for a long time, which is made by pre-processing and seasoning food raw materials, then filling them into containers, vacuum sealing, and sterilization. That is to say, where food is sealed and sterilized or sterilized and sealed (that is, aseptic packaging) to achieve commercial sterility (the so-called commercial sterilization means that after moderate heat sterilization of canned food, there will be no pathogenic microorganisms, nor will there be any Non-pathogenic microorganisms that can reproduce in cans at room temperature, and these microorganisms are in an inhibited state, and will not grow and develop), foods that can be stored for a long time at room temperature are collectively called canned foods. Its packaging materials include tinplate cans, glass cans, aluminum alloy cans, soft cans, aseptic large packages, Tetra Pak which is sterilized and then packaged, and sterilization-resistant plastic cans.