The methods of opening the can cover are tapping, patting the bottom and lighters.

1, tapping method

This method is to tap the edge of the bottle cap, that is, the edge of a circle, hold the bottle body with both hands, and then tap it a few times where it is not very hard, such as the countertop position of this cabinet. Don't push too hard, or the glass bottle will break and scratch your hand easily.

Step 2: Tap the bottom.

This is much simpler. I believe many friends will know this method, that is, turn the canned bottle upside down and pat the bottom of the glass bottle with your palm. This can be stronger, because everyone's strength is still limited. After tapping, try to twist the lid several times until you can unscrew the bottle cap.

3. Lighter method

If you eat canned food outdoors, such as going out for a picnic, you can ask people around you if they have lighters. If there is, burn the edge of the bottle cap with a lighter, which is where you will encounter when screwing. Just burn it gently.

The origin of canned food

The earliest cans were made of glass bottles, and the bottle mouth was tightly plugged with cork and iron wire. 1795, French emperor Napoleon led an army to attack in all directions. Seafarers who live on ships for a long time cannot eat fresh vegetables, fruits and other foods.

Because the front line is too long, a lot of food will rot and deteriorate after being transported to the front line. He hoped to solve the problem of storing food during the 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 be awarded this huge sum of money.

Many people devote themselves to research activities in order to win prizes. Among them, Appert Nicolas, a Frenchman who manages candied food, and his wife put all their energy into 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, then plug the cork tightly and seal it with wax. After ten years of hard research, he finally succeeded 1804.