Aluminium ROPP (18x12)

The aluminium ROPP cap (18×12 specification) is a roll-on pilfer-proof screw cap specifically designed for container sealing. It is made from alloy 8011 or 3105 (temper conditions such as H14/H16), allowing easy deep drawing and roll-on forming on capping/sealing production lines.

18x12mm Aluminium ROPP Cap

18x12mm Aluminium ROPP Cap Structure

Shell: Thread is formed on the bottle neck through roll-on process;
Pilfer Proof Band: Breaks upon opening, providing clear evidence of tampering;
Liner: Pre-inserted sealing liners (such as PTFE composite liner, PE liner, EPE (expanded polyethylene), or Saranex, etc.) ensure airtight sealing.

18x12mm Aluminium ROPP Cap Specifications

Feature	Specification
Diameter × Height	18 mm × 12 mm
Material	Aluminium alloy (8011/3105), 0.17–0.25 mm thick
Liner	EPE or Saranex (cold-fill applications)
Finish	Natural or colored (painted, embossed)
Sealing	Roll-on thread formation with tamper band
Packaging	Boxes of ~8–16 k units
Application	Miniature bottles for spirits, wine, pharma, cosmetics

Surface Treatment and Color:

Available in natural aluminium finish or painted/laminated colors—such as black, gold, silver, etc. Logos can be applied using ink printing, embossing, debossing, or varnishing.
Bulk packaging: Typically sold in large cartons (e.g., 8, 600–16, 000 units) to support high-volume production.

18x12mm Aluminium ROPP Cap Functions and Applications

Sealing and Protection

The cap is roll-formed to tightly engage with the bottle neck threads, while the liner prevents ingress of air, moisture, and contaminants. Suitable for:
Beverages: Preserving freshness and shelf life of mineral water, carbonated drinks, beer, and wine.
Pharmaceuticals/Chemicals: Protection from moisture and light, preventing evaporation or spoilage of contents.

Roll-On Pilfer-Proof Mechanism

The cap is placed onto the bottle and roll-formed to create threads and a tamper-evident band at the neck, ensuring tight sealing and leak prevention.

Tamper Evidence

Upon first opening, the skirt ring separates from the body, clearly indicating if the bottle has been previously opened—ensuring product security (e.g., for premium spirits and pharmaceuticals).

Convenience and Sustainability

Supports easy manual opening and resealing; some designs allow reuse. Made of 100% recyclable aluminium alloy, aligned with eco-friendly packaging trends.

18x12mm Aluminium ROPP Cap Technical Principles

Roll-On Forming Technology

After placing the cap blank on the bottle, mechanical roll-forming molds deform the aluminium cap to match the bottle thread, creating a customized sealing structure.

Liner Customization

Liners can be selected based on content requirements:

PTFE/Silicone Composite Liners: Resistant to strong acids and alkalis, suitable for high-temperature sterilization (e.g., for pharmaceutical filling).
PE Liners: Economical option, suitable for neutral liquids (e.g., juice, water).

18x12mm Aluminium ROPP Cap Performance Advantages

Feature	Application Scenario
High-Strength Sealing	Pressure resistance for carbonated drinks, leak-proof for vacuum packaging
Corrosion Resistance	Compatible with alcohol and acidic liquids
Tamper-Evident Design	Prevents malicious tampering (e.g., health supplements, premium liquors)
Safety	PP-lined caps are microwave-safe (used in food containers)

18x12mm Aluminium ROPP Cap Applications

Food and Beverage Industry

Sealing of mineral water bottles, beer bottles, and glass juice bottles
Matching lids for aluminium foil food containers (requires sealing machine)

Pharmaceuticals and Chemicals

Caps for oral liquid bottles and injection vials (must withstand high-temperature sterilization)
Light-resistant storage for chemical reagents

High-End Product Packaging

Wine and spirits (tamper-evident + resealable design)
Custom appearance (hot stamping, color printing, QR code anti-counterfeiting)

Comparison of 18x12mm Aluminium ROPP Cap with Other Caps

Feature	ROPP Aluminium Cap	Plastic Screw Cap	Crown Cap
Sealing Performance	Excellent (metal + liner)	Moderate (prone to aging)	Excellent (single-use)
Tamper Evidence	Excellent (break-off ring design)	None	Partial
Environmental Friendliness	Excellent (100% recyclable)	Depends on plastic type	Moderate (metal recycling)
Cost	Medium to High	Low	Low

Feature	Pre-threaded (1812-110)	Roll-on (1812-000)	Still Wine Closure
Liner	EPE	EPE	Saranex™
Tamper Proof	TE ring	Pilfer-proof band	Pilfer-proof band
Printing	Multi-color UV	Embossing	Limited
Best For	High-speed filling	Standard bottling	Wine samples