The crown cap features a distinctive design with 21 serrated edges and an integrated sealing liner, a breakthrough that effectively solved leakage issues in early bottled beverages. Today, the 26 mm specification has become an internationally accepted standard, suitable for the vast majority of glass-bottled beverages.
The introduction of aluminum marked a significant turning point in the evolution of crown caps. Compared with traditional tinplate, aluminum crown caps offer superior formability, corrosion resistance, and lightweight advantages, while still maintaining sufficient mechanical strength to withstand internal pressure.
Modern aluminum crown caps are typically stamped from high-purity aluminum alloys such as 8011 or 3105, with a thickness ranging from 0.22 to 0.25 mm. Each cap weighs only about 1.2 grams, yet can withstand internal pressures of up to 8 atmospheres, ensuring the safe storage and transportation of carbonated beverages.
The 26 mm crown cap has a standard outer diameter of 26.2 mm and a height of approximately 6.5 mm. Its 21 serrated edges are evenly distributed, with each tooth's angle and height precisely engineered for optimal sealing and opening performance.
Function of the PE Liner in Crown Caps
Airtight Sealing:
The PE liner is specially engineered to be both elastic and sufficiently soft, allowing it to closely conform to the glass bottle lip. This creates an airtight seal that prevents carbon dioxide loss and oxygen ingress.Flavor Neutrality:
PE is chemically stable. Unlike some older PVC liners, PE does not migrate into the beverage, ensuring that the delicate flavors of craft beer or the purity of mineral water remain unaffected.PVC-Free and Food Safe:
Our PE liners are typically PVC-free and comply with international food safety standards (FDA/EU), meeting the growing consumer demand for clean, non-toxic packaging.Gas Retention:
For carbonated beverages, the specially designed PE liner profile can withstand internal pressures of up to 7 bar, ensuring a consistent and satisfying “pop” sound every time the bottle is opened.
Applications
This 26 mm aluminum crown cap with PE liner is highly versatile and suitable for standard pry-off or twist-off closures, including:
Craft beer: Protects delicate hop aromas from oxidation
Carbonated soft drinks: Maintains high carbonation levels over an extended shelf life
Sparkling water: Ensures a clean, refreshing taste without the risk of metal corrosion
Juices and functional beverages: Suitable for cold filling and pasteurization processes
