Aluminum ROPP (Roll-On Pilfer Proof) caps are widely used in the wine, spirits, and beverage industries, meeting the high standards of tamper evidence, product integrity, and premium appearance. Unlike crown caps or easy-open twist caps, ROPP caps are the ideal choice for enhancing security and allowing resealing after opening.
The surface of ROPP aluminum caps can be printed, embossed, or anodized with brand logos and patterns. These decorative and protective treatments provide both durability and a high level of customization.
Inside the cap, foam liners help ensure tight sealing, keep the contents fresh, prevent evaporation, and provide cushioning during transport. These liners are usually made from polyethylene foam.
Specifications of 18 mm Aluminum ROPP Cap
Size: 18 mm
Material: Aluminum 8011 / 3105
Type: Threaded / Non-threaded
Surface Treatment: ROPP (Roll-on Pilfer Proof), tamper-evident
Color Options: Black, Blue, Gold, Red, Silver, White, Yellow
Applications: Spirits, Wine, Beverages
Packaging: Carton + Pallet
MOQ: 80,000 pcs
Key Advantages of 18 mm ROPP Aluminum Caps
1. Excellent Sealing Performance
The roll-on threading process forms a precise fit with the bottle neck, effectively preventing leakage.
2. Tamper-Evident and Theft-Resistant
The tamper-evident band at the bottom breaks automatically when opened, allowing consumers to easily check whether the product has been tampered with.
3. Chemical Resistance
Internal liners and coatings can be customized to withstand alcohol, acidic, or alkaline liquids without compromising seal integrity.
4. Premium Appearance
Color coating and printing allow for diverse designs and branding elements, enhancing shelf appeal and brand recognition.
5. High Flexibility in Processing
Suitable for different bottle types and materials, including glass and plastic bottles, and supports customized production.
6. Lightweight & Eco-Friendly
Aluminum is lightweight, which reduces packaging costs, and it is fully recyclable—making it an environmentally responsible choice.
Applications
18 mm aluminum ROPP caps are suitable for sealing various small bottles across multiple industries, including:
Beverage Industry: Juice bottles, small-volume energy drinks
Alcohol Industry: Mini wine bottles, small spirits bottles
Pharmaceutical Industry: Oral liquids, medical solution bottles
Cosmetics & Personal Care: Essential oils, perfumes, small skincare bottles
Production & Technical Requirements
The manufacturing of 18 mm ROPP caps involves high-precision equipment and strict quality control to ensure excellent performance:
Production Equipment: Specialized high-speed aluminum cap stamping machines and coating/printing lines are required.
Capping Machine Precision: The accuracy of the capping machine is critical. The pressure and depth of the rolling knives must be precisely controlled to ensure perfect thread formation and correct tamper band breakage.
Material Quality Control: Aluminum sheets must have uniform thickness and flawless surface coatings. Any defects can lead to seal failure or print peeling, affecting both functionality and appearance.
