For carbonated beverages, sealing performance is particularly critical. Since the internal carbon dioxide pressure is relatively high, poor sealing will not only cause the drink to lose its fizz and taste but also shorten its shelf life. Aluminum ROPP caps have become the preferred sealing solution for carbonated beverage packaging.
A ROPP (Roll-On Pilfer-Proof) aluminum closure is a metal cap formed by roll-threading, which tightly matches the bottle neck threads. It provides excellent tamper-evidence, anti-counterfeiting features, and high airtightness.
The 28mm size is an international standard widely used for carbonated beverage bottles. It is suitable for high-speed automated bottling and capping lines and is compatible with both glass bottles and PET plastic bottles.
Since carbonated drinks contain pressurized CO₂, sealing integrity is crucial. The closure’s liner is the key to maintaining gas-tightness, commonly made from PE or EPE materials.
Why is it the first choice for carbonated beverage bottles?
1. Excellent Airtightness
Carbonated beverages require outstanding sealing due to internal CO₂. The precisely rolled threads of the 28mm ROPP aluminum closure, combined with its built-in liner, ensure excellent airtightness, effectively preventing CO₂ leakage and preserving the drink’s taste and effervescence.
2. Safety & Tamper Evidence
The tamper-evident band of the ROPP closure provides a clear indication of opening. Once broken, it shows that the product has been opened, protecting consumers’ rights and enhancing product safety.
3. Strong Pressure Resistance
The internal pressure of carbonated beverages demands caps with strong resistance to deformation. Aluminum ROPP closures offer excellent mechanical strength and rigidity, withstanding internal bottle pressure and preventing cap deformation or popping off.
4. Eco-Friendly & Attractive Design
Aluminum is a recyclable and environmentally friendly material. The closure surface can also be customized with printing, embossing, or decoration, offering wide design flexibility for branding and enhancing packaging appeal.
HAOMEI Aluminum is a professional bottle cap manufacturer. Our aluminum closures support multiple customization options, including various colors, logo printing (UV printing, hot stamping, side printing), and surface treatments (such as embossing). All aluminum closures comply with food-contact safety standards.
