In the beverage industry, a bottle cap is not just a tool for opening and closing a container - it is also a critical factor in ensuring product quality and consumer experience. Among them, the twist-off aluminum cap has become a popular choice for packaging fruit juice, carbonated drinks, tea, functional beverages, beer, and premium bottled water, thanks to its lightweight, attractive design, and excellent sealing performance.
Structural Features of Twist-Off Aluminum Caps
Twist-off caps are typically made from high-quality food-grade aluminum alloys (commonly 3105 or 8011), produced through stamping, rolling, and thread-forming processes. Their structure generally consists of:
Aluminum shell: Provides durability, corrosion resistance, and excellent formability.
Liner gasket: Common materials include EPE (expanded polyethylene), TPE, Saranex, or composite films, ensuring tight sealing and leak-proof performance.
Threaded structure: Engages with the bottle neck, enabling secure locking and resealability.
This design ensures that the cap is easy to open by hand, while still providing strong sealing performance after repeated resealing.
Specifications of Aluminum Caps
| Diameter sizes | 28 mm (commonly for carbonated beverages, mineral water) 30×24 mm, 30×44 mm (juices, tea drinks) 31.5×24 mm, 31.5×44 mm (wine, functional drinks) 38×17 mm, 38×25 mm (beer, health supplements, premium beverages) |
| Height range | 15 mm - 60 mm (customizable for bottle type) |
| Thickness | 0.20 - 0.23 mm (customizable) |
| Material | Aluminum 8011 |
| Liner types | EPE liner, Saranex, TPE, composite film (depending on beverage type) |
| Surface finish | Glossy, matte, printed, hot-stamped, color sprayed |
| Tamper-evident design | Optional tamper ring that breaks upon first opening for authenticity assurance |
| Applicable bottles | Glass bottles, PET bottles, aluminum bottles |
| Applications | Carbonated beverages, juices, tea, functional drinks, beer, wine, premium mineral water, etc. |
| MOQ | 80,000 pieces |
Advantages of Twist-Off Aluminum Caps
Tamper-evident safety: The breaking of the tamper ring provides a clear opening indicator, allowing consumers to confirm product integrity at first glance.
Superior sealing: Dual sealing mechanisms ensure carbon dioxide in carbonated beverages does not escape and prevent oxidation in juices or teas, preserving freshness.
Consumer convenience: No tools required - simply twist by hand for easy opening, greatly enhancing the user experience.
Resealability: Although the tamper ring breaks upon first opening, the liner and threads remain intact, allowing consumers to re-tighten the cap for temporary resealing and later consumption.
Typical Applications
Carbonated drinks: Such as beer and soda, requiring reliable gas retention.
Juices and teas: Prevent oxidation, maintaining taste and nutritional quality.
Functional and nutritional beverages: Higher demands on sealing and product safety.
Premium bottled water: Enhances brand image and elevates consumer experience.
