The 28mm Long Skirt Aluminum ROPP Cap, with its sleek lines, superior anti-theft performance, and excellent texture, has become the preferred sealing solution for vodka, whiskey, premium syrup, and olive oil brands.
What are "long-skirt" aluminum bottle caps?
Most aluminum caps we see have a short skirt, typically 15mm-18mm high. Long-skirt aluminum caps, as the name suggests, have a longer sidewall (skirt), commonly 38mm, 44mm, 50mm, or even longer.
Long-skirt designs are often used in applications requiring better lateral coverage, visual concealment, or to complement thin-walled bottle necks. Applicable industries include beverages (alcoholic or non-alcoholic), edible oils/sauces, health supplement bottles, cosmetic samples, and certain chemical vials.
Why Choose a 28mm Long Skirt Aluminum Cap?
Superior Sealing Performance
The "long skirt" design extends the cap's coverage, creating a tighter seal with the bottle opening. This effectively prevents liquid leakage, gas intrusion, and oxidation of the contents, safeguarding the product's freshness and quality.
Aesthetics
Aluminum is easy to surface treat, such as anodizing, printing, and embossing, meeting brands' demands for high-end, personalized appearances.
Durable Material Properties
The aluminum alloy used as the cap base material (such as 3003 aluminum coil) is renowned for its corrosion resistance and ease of processing. This allows the cap to effectively resist deformation and damage during transportation and daily use, extending shelf life and service life.
Precise Size Suitability
28mm is a market-proven universal size, particularly suitable for beverage bottles with larger openings (such as juice and carbonated drinks) and some personal care product packaging, providing a wide and comfortable opening and drinking experience while ensuring a tight seal.
Technical Specifications of the 28mm Long Skirt Aluminum Cap
| Product Name | 28mm Long Skirt Aluminum ROPP Cap |
| Diameter | 28mm |
| Material | 8011 / 3105 aluminum alloy |
| Height Options | 38 mm / 44 mm / 50 mm / 60 mm (customizable) |
| Liner Options | EPE foam, PE liner, induction foil |
| Surface Finish | Coating, offset printing, silk printing, hot stamping, embossing |
| Packaging | 2,000–10,000 pcs/carton |
| Certification | MTC, food-contact liner report, sealing test report |
| Application | Beverages, wines, olive oil, syrups, etc. |
| MOQ | 80,000 pcs |
FAQ
Q1: Does "28mm" refer to the bottle neck or the cap diameter?
A: In industry terminology, "28mm" usually refers to the standard outer or inner diameter of the bottle neck for the cap interface/fitting mechanism. When signing a purchase contract, the specific drawings (bottle neck outer diameter, thread specification, pitch, and insertion depth) should be used as the basis, not just the literal meaning of "28mm".
Q2: Does the long skirt design affect opening torque?
A: The long skirt itself has a limited impact on the opening force, but the liner material, the fit between the broken ring and the thread, and whether it is an induction seal will significantly affect the required opening force.
Q3: Can the cap be used for carbonated beverages?
A: If used for carbonated beverages, it must be ensured that the thread fit with the bottle body can withstand the internal pressure, and the design of the liner and cap must prevent gas leakage or cap ejection. Pressure/vacuum cycle testing and pressure resistance testing are recommended.
