Every Beer Bottle Cap Has 21 Aliases, Why?

This updated guide examines Every Beer Bottle Cap Has 21 Aliases, Why? and organizes the essential facts, background, and practical takeaways in clear American English.

Origin of jagged bottle caps

In the 1880s, carbonated soft drinks appeared more and more on the market and were favored by customers. But all kinds of cork made of porcelain, metal or cork are not guaranteed to be tight, so when transporting, gas will be lost, affecting the quality of beverage.

William Painter, an American inventor, invented a bottle cap called Crown Cork to prevent this phenomenon. Painter's Crown Cork bottle cap has a wavy edge with 24 serrations, inside with a liner to prevent liquid from contacting the metal plate.

Painter has worked with bottle makers to perfect their products. In 1892, Painter applied for a patent for his crown cap (the type of metal beer bottle cap we often see today). Painter's bottle cap has changed the bottling industry forever

In 1893, Painter established a manufacturer of corks and beverage items called "Crown Cork and Seal Company", now known as "Crown Holdings Inc" with its headquarters located in Philadelphia, USA.

Today, the bottle cap has been gradually refined thanks to the development of technology. The number of aliases on the cork and the height of the cap are reduced, the material changes from metal to PVC but the wavy border like a crown is retained.

Why does the cap of a beer bottle have 21 aliases?

In the 1930s, everyone used a 24-toothed bottle cap invented by William Painter. The number of jagged teeth makes the beer bottle lid too tight and difficult to open.

After testing many times, people have adjusted the number of aliases to 21 as at present. People choose the number 21 for three reasons.

The first reason, 21 is a multiple of 3. In the mechanical principle of physics, to support the most stable object requires 3 points of support. However, it is difficult to apply the three-point rule to fix the round mouth of the bottle, so it is necessary to have a number of aliases that is a multiple of 3.

The second reason, beer is a carbonated liquid. If opened incorrectly, the pressure inside the bottle may be uneven, causing the opener to hurt. 21 aliasing on the bottle cap can ensure safety for people who open the lid.

The final reason, the 21-cap bottle cap meets the two basic requirements of the bottle cap: carefully sealed and firmly fixed.

The 21-toothed beer bottle cap with the best performance in terms of tightness, rigidity and ease of opening has become an international standard.

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