Beer is a fantastic beverage for summer and an indispensable part of many parties. However, not everyone may know the interesting information related to the jagged bottle caps.
The Origin of Jagged Bottle Caps
On February 2, 1892, the bottling industry was forever changed with the introduction of the crown cap (the type of metal bottle cap we commonly see today). This brilliant idea belonged to William Painter, an American inventor. Over his lifetime, he had more than 80 inventions, but the creation of the metal bottle cap was his most successful invention, quickly transforming Painter into a wealthy man.
Various types of bottle caps.
In the 1880s, an increasing variety of carbonated beverages appeared on the market, which became very popular. However, transporting these beverages was challenging due to the inadequacy of cork, ceramic, or metal stoppers, which did not ensure airtightness, leading to gas loss and a noticeable decline in beverage quality.
Determined to prevent this issue, Painter invented a bottle cap known as the Crown Cork. The new cap featured a wavy edge and an inner liner to prevent the liquid from coming into contact with the metal.
After working with bottle manufacturers to refine his product, Painter applied for a patent for his invention in 1892, and by 1893, he founded the “Crown Cork and Seal Company,” now known as “Crown Holdings Inc.” This company is now one of the world’s leading manufacturers of bottle caps and beverage-related products.
As technology advanced, bottle caps were gradually refined. The material was shifted from metal to PVC plastic, and the number of jagged edges on the cap and the height of the cap were reduced. However, the wavy edge resembling a crown was retained.
You will surely be surprised to learn that Crown Holdings, Inc. – Painter’s company – is still operational today. The company’s headquarters is currently located in Philadelphia, USA.
After several adjustments, the number of jagged edges was finally set to 21 as seen today.
Why Do Beer Bottle Caps Have 21 Jagged Edges?
In fact, the first beer caps invented by William Painter had 24 jagged edges. In the 1930s, while everyone was using this type of bottle cap, they discovered that having too many jagged edges made the beer bottle caps too tight and difficult to open.
After numerous repeated experiments, the number of jagged edges was finally adjusted to 21, as it is today. But why 21 jagged edges?
- Firstly, 21 is a multiple of 3. According to the principles of physics, three points supporting an object are more stable than two or four points. However, applying the three-point principle to stabilize a round bottle neck is quite challenging; thus, beer bottle caps need to have a number of jagged edges that is a multiple of 3.
- Secondly, the bottle cap must meet two basic requirements: one is to seal tightly, and the second is to secure firmly. A bottle cap with 21 jagged edges satisfies both of these requirements.
- Finally, because beer contains a certain amount of carbonation, improper opening can lead to uneven pressure inside the bottle, which can cause injury to the user. A 21-jagged-edge cap can ensure safety for the user when opening the cap. Furthermore, the wavy design of the cap not only increases friction but also facilitates easier opening of the bottle cap.
Due to its excellent performance in sealing, rigidity, and ease of opening, the 21-jagged-edge beer cap has been perfected and become the international standard.
In Vietnam and many other countries, not only beer but also other carbonated beverages in glass bottles commonly use this type of cap.
