Section 1 Evolution and Development of Canned Food

Here, it is necessary to repeatedly emphasize the principle of tank storage and the basic production process.

Pretreatment → filling → venting → sealing → sterilization and cooling → storage.

The definition of canned food is the principle and basic manufacturing process of canned food.

You are not familiar with the production process, how to identify the shopping mall, characteristics: open rotten and cooked food and keep it at room temperature for a long time; Exclude other preservation principles.

For example: ham sausage, beer, drinks, bagged pickles.

Bagged rice, bagged candied fruit, bagged biscuits. Pickles, Chili sauce.

The second paragraph: emphasize ventilation → sealing → sterilization.

Glass bottles → tinplate cans → resistance welding cans

Plastic bottles/paper composites/aluminum foil, etc. You can check it in the supermarket.