We can see that most of the beer on the market is bottled, and the advantage of bottled beer is that the raw material glass of the bottle is easy to make, filling is easy, and the bottle can be recycled.
However, the bottle cap is often ignored by us, and it is generally thrown directly after opening. In fact, we drink beer, the cap is used to package and seal, the bottle is opened, the lid is of course useless.

Don't underestimate this small bottle cap, it is not something that can be made casually. Packaging with substandard caps and opening caps incorrectly can create potential undesirable factors.
Our country also has a standard for the production of beer bottle caps. Knowing something about it may give you a better understanding of beer.

The beer cap is small, but we can see that it is angular, with a standard crown of 21 teeth.
The cap consists of a cap body and a gasket. The lid body is made of thin steel plates plated with tin or chrome on the outside and covered with gaskets inside. The role of the gasket is to prevent the leakage of carbon dioxide and the penetration of the liquor.

We all know that beer has a shelf life, and this little bottle cap actually has a shelf life, and its shelf life is two years. But we can't find its manufacturing date on the cap, so we don't know much about its shelf life. Careful friends will find that we sometimes find that the cap is rusty after the beer is opened, in fact, this is the metal cap has been oxidized, which may be a sign of expiration.
Bottles of wine are filled with carbon dioxide gas when filling, so once the beer bottle is sealed, there is a certain pressure in the bottle. Some friends like to use chopsticks or two wine bottles to open each other when opening bottles, or even use their teeth to open bottles directly. These are very dangerous ways to open bottles, especially with teeth, if the bottle bursts due to excessive pressure, the consequences will be very serious. Be sure to use a special bottle opener to open beer bottles to minimize the risk of opening.
