HAOMEI Aluminum's 31.5mm aluminum caps with Saranex liners feature an innovative composite structure that perfectly integrates the rigidity of aluminum with the superior barrier properties of Saranex. The aluminum shell offers excellent mechanical strength and user-friendly operability, while the Saranex liner ensures complete isolation of the product from the external environment.
These 31.5mm ROPP aluminum caps with liners are specifically designed for products sensitive to oxygen, moisture, and off-flavors-effectively preventing oxidation, aroma loss, or flavor degradation during storage. They are widely used in packaging wine, olive oil, and other high-value liquids.
Saranex is a multi-layer barrier material known for its exceptional resistance to oxygen, water vapor, odors, and various chemicals. Its elasticity allows it to adapt to minor irregularities on the bottle mouth, creating a uniform and tight seal.
Compared with common PE, EPE, or TPE liners, Saranex liners significantly reduce the contact between liquid and air, slowing down oxidation and extending product shelf life while maintaining flavor stability.
Features of HAOMEI 31.5mm Aluminum Caps with Saranex Liners
1. Standard Compatibility
Meets the international standard for 31.5mm bottle finishes and perfectly matches PFP (Pilfer-Proof) threaded bottle mouths.
2. Tamper-Evident Design
Manufactured using ROPP forming technology, the tamper-evident band tightly locks onto the bottle neck. Once opened, the band breaks instantly, providing clear tamper evidence to protect brand integrity.
3. High-Quality Aluminum Material
Produced using 3105 or 8011 aluminum alloy, offering excellent deep drawing and spinning performance. This ensures smooth, reliable capping during the sealing process.
4. Enhanced Freshness Protection
Saranex liners offer extremely low Water Vapor Transmission Rate (WVTR) and Oxygen Transmission Rate (OTR), effectively preventing oxygen ingress into the bottle headspace and avoiding oxidation or spoilage of the liquid product.
31.5mm Aluminum Cap Product Specifications
| Cap Diameter | 31.5 mm |
| Height Options | 18 mm, 24 mm, 44 mm (customizable) |
| Liner Material | Saranex (high-barrier composite material) |
| Liner Thickness | 0.25-0.35 mm |
| Aluminum Alloy | AA 3105 or AA 8011 |
| Coating | Food-grade internal and external coating |
| Compatible Bottle Finish | PFP 31.5mm threaded bottle mouth |
| Opening Method | Screw-off |
| Color Options | Black, gold, blue, rose gold, custom colors |
Printing Options | Silk printing, hot stamping (gold/silver), UV full-color, embossing |
| Packaging | Carton + pallet |
| MOQ | 80,000 pieces |
Applications of 31.5mm Aluminum ROPP Caps
Alcoholic Beverages
Wine, whiskey, brandy, vodka, sake, fruit wine, craft spirits, etc.
Edible Oils
Olive oil, vegetable oil, premium edible oil packaging.
Pharmaceutical Packaging
Oral liquids, medical reagents, laboratory chemicals, health supplement solutions.
Cosmetics
Essential oils, fragrances, aromatherapy liquids, etc.
Aluminum Cap Customization Services
Brand Printing
Customized logo printing available; minimum order 50,000 pieces.
Graphic Designs
Support for complex graphic customization; minimum order 100,000 pieces.
Decorative Options
Embossing, hot stamping, multi-color printing, and more for premium branding effects.
