Beer fresh-keeping barrels are specially designed beer barrels for fresh beer storage and transportation. It's notoriously difficult to store draught beers of all kinds because:
First, fresh beer contains live yeast, which will multiply when the temperature rises, thereby destroying the taste and quality of beer;
Second, the fresh beer contains carbon dioxide, which will overflow when the pressure is insufficient, and the wine will be oxidized in contact with the air, which will destroy the taste of the beer;
Third, fresh beer is rich in nutrients, which is very conducive to the growth and reproduction of microorganisms. Even a small amount of microorganisms will greatly shorten the quality guarantee period of beer.
Therefore, there are three requirements for beer preservation:
First, maintain the initial temperature of the beer filling;
Second, keep the carbon dioxide contained in the beer from overflowing and isolate oxygen;
Third, keep the beer barrels clean and hygienic. Therefore, a high-quality beer keg must have three major properties, 1, heat preservation, 2, pressure and oxygen preservation, 3, cleaning.
Beer kegs can be divided into: all-plastic beer kegs, all-steel beer kegs, and the newly developed steel gallbladder plastic shell (or inner steel outer plastic) beer kegs according to the order of use in the market and the material of the inner and outer structures:
