①: At that time, when beer originated and produced, the inventor of this corrugated metal bottle cap was William Pater. He found that the best number of teeth for sealing carbonated drinks bottle caps is 24, and applied for a patent for the steel mold designed for this purpose. 24-tooth bottle caps have become the standard for many years. By about 1930, the steel mold was threatened by the cheaper tinplate mold. If the new mold still uses 24 teeth, it cannot be patented, so it is changed to 2 1 tooth to avoid infringement on the original design. 2 1 tooth is the minimum number of teeth to avoid beverage leakage. From: Kitran Durasami, New South Wales.
②: These lids are made according to the internationally recognized German standard DIN6099. In order to ensure that all caps are the same, this standard not only defines the diameter of the bottleneck, but also defines the shape of the edge of the bottle cap and the manufacturing material. One of the requirements of bottle cap is good sealing, that is to say, there are many folds; At the same time, the bottle cap should be firm, that is to say, the number of pleats should not be too large to ensure that the contact surface area of each pleat is large. 2 1 tooth is the best compromise between these two requirements. S Hamply from England.
③:1892. On February 2nd, Pate obtained the patent of corrugated metal bottle cap. It had 24 teeth at first, and was lined with paper to prevent the drink from contacting with metal. The current version is 2 1 tooth. 24-tooth bottle caps are first placed on the bottles one by one with a foot press. After the automaton appeared, put the bottle cap into a feed pipe, and the 24-tooth cover can easily block the feed pipe. If the number of teeth is odd, this will not happen. Because the sealing performance of 23 teeth is not better than that of 2 1 tooth, people choose the least number of teeth. Since: Barry Pater, Niederlandhausen, Germany
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