The aluminum tamper-evident ROPP cap is a sealing solution specially designed for glass bottles, integrating both tamper evidence and secure sealing through a unique mechanical structure.
Production Process and Key Technology
The production of aluminum ROPP caps involves stamping, spin-forming, printing, and liner insertion. Among these, spin-forming is a crucial step that requires precision equipment to ensure perfect compatibility and sealing between the cap and the bottle neck.
Tamper-Proof Mechanism & Working Principle
1. Structural Design
Skirt Roll-Forming:
The aluminum cap starts as a smooth cylinder. A ROPP capping machine uses rollers to press threads onto the skirt, matching the glass bottle neck tightly.
Tamper-Evident Band:
A breakable ring at the base detaches upon the first opening and remains on the bottle neck, providing permanent evidence of tampering.
Liner Seal:
Standard PE or EPE foam liners compress during roll forming to create airtight and leak-proof seals, preventing leakage or evaporation.
2. Tamper Verification
The tamper-evident ring cannot be restored once broken, allowing consumers to assess product integrity at a glance. Complies with FDA and GMP regulations.
Applications and Target Industries
| Industry | Typical Products | Compatible Bottle Types | Key Advantages |
| Alcohol | Wine, Spirits | Glass bottles (28–38mm diameter) | Tamper-proof security + aging-grade sealing |
| Pharmaceuticals | Oral solutions, Injections | Small glass vials (12–20mm) | Contamination prevention + regulatory compliance |
| Food & Beverage | Olive oil, Premium juice | Wide-mouth glass bottles | Oxygen barrier + premium appearance |
| Chemicals | Lab reagents, Solvents | Amber glass bottles | Chemical resistance + leak-proof |
| Case Study | The 28×18mm aluminum ROPP cap (8011 alloy) is widely used for mineral water glass bottles. It features a built-in PE liner that withstands 60kPa pressure tests, ensuring shock resistance during transport. | ||
Why Aluminum ROPP Caps Are Best for Glass Bottles
Superior Sealing
Roll-on sealing ensures tight bonding with the glass neck, preventing leaks and contamination.Effective Tamper Evidence
The tamper-evident ring breaks irreversibly upon first opening, deterring unauthorized access.User-Friendly Opening
Easy-open design requires no special tools, enhancing consumer convenience.Material Compatibility
Aluminum is chemically stable with glass and contents, offering lightweight and corrosion-resistant performance across various conditions.Eco-Friendly
Aluminum is infinitely recyclable, supporting sustainability goals and enhancing a brand’s green image.
Why Choose Us?
Strong Customization Capabilities
Flexible in cap sizes (18×12, 30×35, 28×15, etc.) with OEM/ODM services available.High-Volume Production
Multi-cavity precision stamping systems enable daily production exceeding 200,000 caps.Strict Quality Control
Every order includes material inspection reports and traceable batch numbers.Reliable and Fast Delivery
Samples shipped within 3 days; standard orders delivered in 7–10 days.
HAOMEI Aluminum is a professional closure manufacturer offering aluminum tamper-evident caps, aluminum-plastic combo caps, and plastic closures in various sizes. Our clients include leading domestic and international wine, beverage, and nutrition brands who trust our products. Samples are available, and we warmly welcome all new and returning customers to visit our factory.
