HAOMEI Aluminum produces aluminum ROPP caps, which, with their tamper-evident, leak-proof, and high-sealing properties, have gradually become the mainstream choice for olive oil packaging. These closures help prevent premature oxidation of olive oil and other sensitive beverages, thus extending their shelf life and ensuring that aroma and flavor remain unchanged.
We provide various sizes of ROPP caps / plastic caps / screw caps / metal caps, with 31.5x24 mm caps being the most commonly used. Customization is available upon request.
Olive Oil Bottle ROPP Caps Product Information
| Sizes | 31.5x24mm, 31.5x18mm, 30x24mm, 28x18mm, 30x35mm, etc. |
| Material | Aluminum 8011, 3105 |
| Colors | Dark green, black, etc., customizable |
| Type | Screw cap |
| Liner Options | EPE, Saranex, PVC-free, butyl rubber liners, etc., to meet different sealing and anti-leakage needs |
| Surface Treatment | Printing, hot stamping, spraying, anodizing, embossing |
| Sample | Available |
| Logo | Customizable |
| MOQ | 80,000 pcs |
Sizes of Olive Oil Bottle ROPP Caps
| Size | ID (mm) | OD (mm) | C (mm) | Thickness (mm) | Weight (g) |
| 22mm Cap | 21.4-21.9 | 22.5-23 | 15-15.23 | 0.18-0.2 | 0.880-0.910 |
| 25mm Cap | 24-25 | 25.5-26 | 16.5-17.3 | 0.18-0.2 | 1.08-1.25 |
| 28mm Cap | 27-28 | 28.5-28.9 | 17.5-18.5 | 0.18-0.2 | 1.3-1.4 |
Core Functional Value of ROPP Caps for Olive Oil
High airtight sealing – Delays oxidation
Olive oil is rich in unsaturated fatty acids and prone to oxidation (causing rancidity) when exposed to air. The “roll-on pilfer proof + elastic sealing liner” design of ROPP caps reduces oxygen permeability to ≤0.1 cc/day (at 25°C). Combined with dark glass bottles (for light protection), the shelf life can be extended to 18–24 months (unopened).Tamper-evident & anti-counterfeit – Ensures quality
The tamper-evident ring with “break points” is non-resealable. Premium versions can integrate “traceability codes and laser anti-counterfeiting marks,” effectively preventing cap replacement, refilling, or adulteration (e.g., low-grade oils being sold as extra virgin olive oil), thereby protecting brand reputation.User-friendly operation – Fits consumption scenarios
Consumers can easily open the bottle by “tearing off the tamper ring, then twisting the cap clockwise” (no tools required). The cap’s anti-slip knurling increases grip (especially when hands are oily). Some ROPP caps also include a controlled-flow spout (small dispensing outlet) to avoid spillage during pouring.Temperature & corrosion resistance – Suitable for varied storage conditions
Aluminum alloy / PP material is oil-resistant, low-temperature resistant (suitable for refrigerated storage), and withstands short-term heating at 60–80°C (such as during summer transport), without swelling or harmful substance migration (in compliance with food contact safety standards).
Production Considerations for ROPP Closures
Bottle neck size matching: The cap’s inner diameter must precisely match the bottle’s outer diameter (tolerance ±0.1mm). Otherwise, sealing defects or cap cracking may occur. Glass bottle mouths often require “edge grinding” to avoid damaging sealing liners.
Compression control of sealing liners: Elastic liners should be compressed 30%–50% (e.g., a 2mm silicone liner compressed to 1.2–1.4mm). Too loose causes leakage, while too tight makes opening difficult.
Capping machine parameter adjustment: Rolling wheel pressure (aluminum cap: 0.3–0.5 MPa; PP cap: 0.2–0.3 MPa) and speed (300–500 r/min) must be set according to material. Improper settings may cause incomplete sealing or cap deformation.
