Canned food in tourism activities, in polar expedition, in the universe, in family life...... Everywhere, they are indispensable items. They can be stored for a long time without deterioration.

 

In the 1950s and 1960s, a British scientist feasted a group of chemists with an ingenious dinner. The first dish was a big pie made in 1900, the second was mutton baked in 1849, the third was a dessert made in 1823, and the dessert was chocolate candy made in 1915 for dessert. . All the dishes removed from the sealed cans were praised by the guests.

 

Canned food in the processing process, generally first raw material processing, flavoring treatment, and then into a clean empty can, and then through heating and exhaust or mechanical vacuum method, the part of the air left in the can is removed, and then can sealed, and finally to carry out strict sterilization. In this way, the cans can be kept in a cool and dry place, so that it does not rust, do not touch the seal, it can be stored for a long time without deterioration.

 

Recently, Japan's food industry has challenged the traditional production methods of canned food by inventing a "live fish can" and putting it on the market.

 

It is reported that the Fujilin Fisheries Company in Sapporo, Hokkaido, Japan, has treated the live fish in "mini water" (a mixture of 50% carbon dioxide and 50% oxygen is injected into clean water) to make the live fish anesthetized in a comatose state and then canned and sealed. The fish in the pot will not die in two or three days. Before eating, open the can and put the fish in clear water. Within 10 minutes, the fish will wake up and bounce around. This kind of canned food has been popular with vegetable shops, canteens and housewives since its launch.

 

Now, some aquatic products companies are producing "canned live shrimp" and "canned live turtle" to meet the needs of different fresh aquatic products.

 

At present, the world's annual output of canned goods is more than 40 million tons. However, people are always concerned about whether eating canned food will bring adverse effects on people's health. With the deepening of human understanding of trace elements, people have realized that tin alloy cans, galvanized cans and other metal bottles and cans are harmful to human beings to varying degrees, so now canned food is especially popular in glass bottles, because it has no metal pollution, and people can see through transparent glass Know if the food is spoiled.