Beer Cap Mystery Uncovered: Why Every Bottle Has Exactly 21 Edges—A 130-Year-Old Invention
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News18 Lokmat•01/12/2025
Beer Cap Mystery Uncovered: Why Every Bottle Has Exactly 21 Edges—A 130-Year-Old Invention
- •Beer caps have 21 edges for a specific reason.
- •The 21-edge design dates back to 1892.
- •Invented by William Painter, founder of Crown Cork Seal Company.
- •21 ribs balance strength and flexibility for carbonation.
- •The design is an international standard for beer caps.
Why it matters: Understanding beer cap design reveals how engineering impacts everyday products.
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