The 31.5 mm black aluminum ROPP screw cap, with its elegant appearance, excellent sealing performance, and strong processing adaptability, has become a popular choice for packaging wine, spirits, olive oil, specialty edible oils, and premium beverages.
What is a 31.5 mm Black Aluminum ROPP Screw Cap?
ROPP stands for Roll-On Pilfer-Proof, referring to caps that are roll-formed to create matching threads and tamper-evident bands on the cap’s inner wall, ensuring three key features: tamper evidence, leak prevention, and easy opening.
31.5 mm indicates the standard cap diameter, typically paired with heights around 24 mm (like 31.5 X 24 mm, 31.5X18 mm,31.5X44mm), compatible with international standard bottle finishes.
The black anodized or sprayed coating delivers a premium, sophisticated look—perfect for brands seeking a high-end, elegant, and professional image.
Manufacturing Process
Aluminum coil blanking → Thread rolling → Liner injection → Tamper band cutting → Surface finishing (black spray coating/anodizing).
Note: SACMI equipment accounts for over 60% of global compression lining production lines.
Product Specifications
| Diameter | 31.5 mm |
| Height | 18 mm / 24 mm / 44 mm (customizable) |
| Material | Aluminum (typically 8011-H14/H16 temper) |
| Surface treatment | Black anodizing, spraying, electrophoresis, or printed coating |
| Liner options | Food-grade EPE, Saranex, PVC-Free, etc. |
| Bottle finish compatibility | 31.5 mm BVP (international standard glass bottle thread) |
| Tamper-evident design | Single-use breakable ring, leaving clear evidence of opening |
| Printing/decoration options | Offset, silkscreen, pad printing, hot stamping, UV printing (customizable) |
| Color options | Standard black (glossy, matte, brushed finishes available) |
| Packing quantity | Typically 1,500–2,500 pcs/carton (depending on height and packing method) |
| Certifications | Compliant with food-contact safety regulations (FDA/EU options available) |
| MOQ | 50,000 pcs |
Main Advantages of 31.5 mm Aluminum ROPP Caps
Tamper-evidence: Breakable ring ensures product integrity and consumer trust.
Airtight seal: Excellent sealing to extend shelf life and prevent leaks.
Durability: Aluminum is robust and withstands handling and transport.
Corrosion resistance: Aluminum doesn’t rust, making it ideal for products exposed to moisture.
Consumer convenience: Easy to open and re-close.
Customizability: Available in various colors and can be printed for branding.
Recyclability: Aluminum is highly recyclable, supporting sustainability goals.
Common Application Areas
Wine, vodka, sparkling wine, spirits
Olive oil, walnut oil, sunflower oil, and other premium edible oils
Pharmaceuticals and liquid nutraceuticals
High-end condiments and beverages
HAOMEI Aluminum – Customization Options
To meet diverse market needs, 31.5 mm black ROPP aluminum screw caps typically support a wide range of customizations:
Color: Black in glossy, matte, brushed, or metallic effects
Printing: Logos, graphics, barcodes, QR codes
Size: Customizable heights (31.5 x 18 mm, 31.5 x 24 mm, etc.)
Liner material: EPE, Saranex, PVC-Free food-grade options
Anti-counterfeiting features: Laser engraving, invisible codes, tamper-evident layers
