Before the invention of twist-off aluminum caps, cork stoppers were the mainstream solution for sealing bottles. However, corks come with several inherent drawbacks, such as being hard to open, susceptible to contamination, and offering inconsistent sealing.
In 1959, French company LBM developed a new kind of twist-off cap for the wine industry, which laid the foundation for the modern aluminum ROPP cap (Roll-On Pilfer-Proof). By the 1970s, this design gained popularity across Europe and Australia, leading to the widespread adoption of today's twist-off aluminum closures.
A twist-off aluminum cap is a screw-type metal closure created through a roll-forming process that precisely matches the bottle neck. It allows consumers to open the bottle easily by hand without tools, while also providing excellent tamper evidence and user convenience.
At HAOMEI Aluminum, we manufacture twist-off aluminum caps using durable food-grade aluminum alloy (8011). Our caps are specially engineered to suit various bottle sizes and neck types, ensuring airtight, leak-proof sealing and reliable product preservation.
Full Range of Sizes - Customizable Options
| Size (mm) | Applications | Features |
| 18x12 / 18x13 | Pharmaceuticals, essential oils, small-dose liquids | Compact and leak-proof |
| 28x15 / 28x18 | Condiments, beverages, energy drinks | Fits most PET bottles, highly adaptable |
| 30x35 / 30x60 | Wine, fruit wine, premium drinks | Customizable height, suitable for printing and foil stamping |
| 31.5x18 / 31.5x24 / 31.5x44 | Olive oil, spirits, liquors | High-end screw closure with anti-counterfeiting features |
| 33x18 / 33x25 / 33x40 | Health supplements, tonic wine | Compatible with wide-mouth bottles |
| 38x17 / 38x24 | Large-volume drinks, cooking oils | Excellent sealing performance |
| Custom Sizes | OEM / ODM | Accepts samples or drawings; low MOQ for custom orders |
Why Are Twist-Off Aluminum Caps So Widely Preferred?
1. Outstanding Sealing & Freshness Retention
Thanks to Roll-On Pilfer-Proof (ROPP) technology, the cap is roll-formed to match the bottle’s threads, creating an airtight seal that protects freshness and prevents leaks.
2. Built-In Tamper Evidence
Each twist-off aluminum cap comes with a tamper-evident band, which separates upon opening. This assures consumers that the product hasn't been previously opened or tampered with.
3. Consumer-Friendly
Unlike corks or crown caps that require tools, twist-off caps are easy to open by hand-a major convenience for end users.
4. Highly Automated
ROPP capping machines enable high-speed, precision sealing, minimizing labor costs and errors in the production line.
5. Cost-Effective
Compared to traditional cork closures, aluminum caps are lighter, more durable, and less expensive to produce, helping reduce both shipping costs and breakage rates.
6. Environmentally Friendly
Aluminum is fully recyclable and contains no harmful substances, aligning with global trends toward sustainable packaging.
