In 1809, the world trade was prosperous. Seamen who lived on ships for a long time fell ill because they could not eat fresh vegetables, fruits and other foods, and some suffered from severe life-threatening scurvy. So the French government used a huge prize of 12,000 francs to ask for a way to store food for a long time. Many people have invested in research activities in order to win awards. Among them, the Frenchman Appel and his wife, who are engaged in candied food, devoted all their energy to continuous research and practice, and finally found a good way: put the food into a wide-mouth glass bottle, plug the bottle with a cork, and heat it in a steamer , and then plug the cork tightly and seal it with wax. In this way, the earliest cans appeared. The Abels were rewarded by the French government and warmly welcomed by the seafarers. Canning is a method of packaging food, which can be canned beverages, including canned soda, coffee, juice, frozen milk tea, beer, etc. It can also be canned food, including luncheon meat, and the packaging material is tinplate. The can opener is used in the can opener, or there is imitation can technology. The packaging material used is aluminum alloy. Nowadays, most of the cans are open cans, which are easy to use.