Speaking of beer, there is a very interesting phenomenon that everyone has never noticed, that is, there are not many jagged teeth on the beer bottle cap, and the number of saw teeth of each brand beer cap is the same. Before the tin beer cap was invented, most of the caps were wooden plugs, but the plugs were very troublesome when they were opened, and the beer itself was full of gas. If it could not be opened, the gas inside would slowly run away. The foam cannot be formed and the taste of the beer will deteriorate. Therefore, people hope to find a replacement for wooden corks in order to quickly open the cap. At the end of the 19th century, the British William Pate discovered that the jagged iron cap was more convenient to open. The only difference was that the iron cap he invented was 24 teeth. At that time, the beer cap had the same appearance as today. The inside is padded with paper to prevent the beverage from coming into contact with the metal. The 24-tooth cap is patent-pending and has been used until around the 1930s. The development of the industry saved manpower. The original manual stamping gradually evolved into industrial capping. The 24 tooth caps were first pressed on the bottle mouth by one foot press. After the automatic loader appears, the cap is loaded into a hose for automatic installation. However, during use, it was found that the 24-tooth cap easily blocked the hose of the auto-loader, and this situation did not occur after the number of teeth was changed to a single number, but a 23-tooth seal was found in the subsequent installation. The sex is not as good as 21 teeth, so the 21 tooth cover has been used today. The beer cap is designed to be 21 serrated and not designed according to what principle, but the result of people's experiments. This experiment is actually related to the bottle opener. As we all know, beer contains a lot of carbon dioxide, so there are two basic requirements for the bottle cap, one of which is better sealing. People like to drink beer in summer because it contains carbon dioxide. When carbon dioxide enters the human body, it will be released soon, taking away the heat inside the body, making people feel cool. Therefore, when people drink beer, people like to drink a lot of mouth, so that they can inhale more carbon dioxide, which brings a comfortable taste, which is also the unique flavor of beer. Since beer contains a lot of carbon dioxide gas, it is necessary to consider how to open the beer bottle safely and conveniently. After inventing the screwdriver that is suitable for opening the cap, and by continuously modifying the serrations, it is finally determined that the 21-cap cap is the easiest and safest to open. The second is to have a certain degree of occlusion, that is, the bottle cap is usually said to be firm. This means that the number of pleats per cap and the contact area of ​​the cap are proportional to ensure that the contact surface of each pleat can be larger, and the wavy seal on the outside of the cap can both increase friction and facilitate Open. And 21 teeth is the best choice to meet these two requirements. The beer cap design has been recognized and soon used in other beverage packaging, such as cola, sprite, sour plum soup and other bottled drinks. Adhesive Wound Dressing,Medical Small Wound-Care Plaster,Medical Waterproof Transfusion Wound Plaster,Medical Elastic Adhesive Aid-Band Surgimed Medical Supplies Co.,Ltd , http://www.surgimedcn.com