In the field of premium edible oil packaging, the 31.5mm olive oil bottle ROPP aluminum cap stands out for its excellent sealing performance, elegant appearance, and superior tamper-evident functionality. It is widely used in the packaging of olive oil, grape seed oil, flavored oils, as well as pharmaceuticals and alcoholic beverages.
Once the aluminum ROPP cap is sealed onto the olive oil bottle, the first opening will leave a visible sign of tampering, providing reliable evidence of product integrity and safety.
The 31.5mm aluminum ROPP cap is particularly suitable for medium-sized olive oil bottles, offering a perfect balance between a convenient pouring diameter and optimal airtight sealing.
Olive oil aluminum caps are commonly available in green and black finishes, adding a sense of elegance and sophistication to the packaging - a choice highly appreciated by both manufacturers and consumers.
High-quality 31.5mm aluminum ROPP caps typically feature an EPE (Expanded Polyethylene) liner, a material known for its excellent resilience and sealing properties, effectively compensating for any minor bottle neck deformation due to temperature changes.
Compared to conventional screw caps, ROPP aluminum caps provide superior sealing performance, effectively blocking oxygen ingress and significantly slowing down the oxidation of olive oil - helping preserve its freshness, aroma, and nutritional value.
HAOMEI Aluminum offers various surface finishing technologies, including high gloss, matte, and metallic effects, to meet different brand positioning requirements. Logos, graphics, or product information can be printed or embossed directly onto the cap surface, turning each cap into a moving brand advertisement.
31.5mm Olive Oil Aluminum Cap Product Information
| Product Name | 31.5mm ROPP Aluminum Cap |
| Material | 8011 / 3105 Aluminum Alloy |
| Diameter | 31.5mm |
| Height | 24mm / 44mm (customizable) |
| Color | Black, Green (custom colors: Red, Gold, Silver, Blue, etc.) |
| Surface Finish | Spraying, Anodizing, Electrophoresis, Screen Printing, Hot Stamping, Embossing, etc. |
| Liner Options | PE / EPE / EVA Composite Liners, PTFE Liner, High-Temperature-Resistant Liner |
| Sealing Method | Mechanical Roll-On (ROPP sealing machine) |
Compatible Bottles | Glass Bottles, PET Bottles (with ROPP thread standard) |
| Application Fields | Olive Oil, Edible Oils, Healthcare Products, Alcohol, Beverages, Pharmaceutical Packaging |
| Sample | Available |
| MOQ | 80,000 pcs |
Functional Advantages of Green and Black Olive Oil Bottle Caps
Functional Role of Color:
Black (Black Finish):
Black absorbs the most light among all colors. In olive oil packaging, dark-colored caps — especially when paired with dark glass bottles - help prevent light from penetrating into the oil. Light exposure is one of the main causes of olive oil oxidation and rancidity. Using a black cap provides extra light protection, preserving oil quality for longer periods.
Green (Green Finish):
In packaging design, green represents nature, health, and organic quality. This color aligns perfectly with the natural attributes of olive oil and the Mediterranean aesthetic, instantly appealing to health-conscious consumers.
Dark green and black aluminum caps both effectively block light and reduce photo-oxidation reactions, maintaining the fresh flavor and nutritional value of olive oil.
Studies have shown that opaque packaging can extend the shelf life of olive oil by over 30% compared to transparent packaging - a significant advantage for premium olive oil products.
Application Fields of 31.5mm Aluminum Caps
Olive Oil Bottles (Extra Virgin Olive Oil)
Grape Seed Oil / Walnut Oil Bottles
Pharmaceutical Glass Bottles (for liquid medicine, supplements, etc.)
Liquor Bottles and Flavored Alcohol Packaging
Health Supplements and Cosmetic Essential Oil Bottles
Why Choose HAOMEI Aluminum?
1. Over 20 Years of Aluminum Cap Manufacturing Experience
We possess a fully integrated aluminum cap production line - from aluminum coil slitting to cap forming, printing, and coating - ensuring consistent quality and efficiency.
2. Strict Quality Control System
Certified with ISO9001, SGS, and FDA, guaranteeing that every cap meets international food-grade safety and hygiene standards.
3. Professional Customization Service
We provide OEM/ODM customization based on client bottle samples or design drawings - including cap color, logo printing, and dimensions - to perfectly match brand identity.
4. Efficient Delivery & Strong Export Capability
Our products are exported to more than 50 countries, including Europe, the Middle East, and South America. We have established long-term cooperation with several renowned olive oil brands worldwide.
5. Sustainable & Eco-Friendly Philosophy
All aluminum materials are 100% recyclable, aligning with the global trend of sustainable packaging and carbon-neutral manufacturing.
