He hoped to solve the problem of food storage in war and March, so the French government asked for a way to store food for a long time with a huge bonus of 12000 francs. If someone can invent the technology and equipment to prevent food from going bad, he will get this huge sum of money. Many people devote themselves to research activities in order to win prizes.
Among them, Appert Nicolas (1749- 184 1), a Frenchman who manages candied food, devoted all his 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, heat it in a steamer, and then plug it tightly.
After ten years of hard research, he finally succeeded 1804. He processed the food, put it in a jar, put it all in a boiling pot, heated it for 30-60 minutes, stuffed it with a cork while it was hot, and then reinforced it with thread or sealed it with wax. This technology was disclosed after 18 10 was patented. In this way, food can be preserved for a long time without spoilage. This is the embryonic form of modern canned food.
Appel received a bonus from Napoleon and opened a factory to provide food for the French army. Shortly after Appel's glass jar came out, an Englishman named Peter Durand developed a tin jar made of thin and hard iron, which was patented in Britain and later obtained by Hall, gamble and Tang Jin. It is the ancestor of the commonly used tin can.