The ROPP (Roll-On Pilfer-Proof) aluminum screw caps provided by Haomei are metal bottle caps that are formed by rolling process and have anti-theft functions. They are mainly made of aluminum and are lightweight, corrosion-resistant and highly sealed.

As a professional bottle cap supplier, Haomei Aluminum focus on wine bottle caps and support complex designs such as anti-theft rings and foam pads. 30mm caps are widely used in wine bottles. We are equipped with (Sacmi) ROPP cap fully automatic production line (stamping, padding, and testing integration) with a production capacity of 1,300 caps/hour. The 3D visual inspection system can realize AI real-time monitoring of cap defects and sealing. The bottle cap is initially a threadless aluminum sleeve, the roller of the ROPP capping machine is used to apply pressure to form a thread on the bottleneck that matches the bottle mouth. The perforated anti-tampering ring design at the bottom ensures that it cannot be restored after opening, providing anti-theft function. Aluminum alloy coils (such as Al 98.25%, Si 0.05-0.20%) are used, and hot rolling, cold rolling and annealing processes are used to ensure that the material has both strength and deep punching performance to meet the high-precision processing requirements of bottle caps.

Size and applicability of ROPP aluminium screw caps:

- Common sizes: 18mm, 20mm, 24mm, 28mm, 30mm (customized according to the outer diameter of the bottle mouth).

- Parameter example:

20mm cap: threaded inner diameter 18.0mm, unthreaded inner diameter 19.2mm, inner height 6.3mm.

24mm cap: threaded inner diameter 22.7mm, unthreaded inner diameter 23.3mm, inner height 13.5mm.

Special needs: Support non-standard size customization, bottle samples or drawings are required.

Material and structure of ROPP aluminum screw caps:

- Base material: high-purity aluminum 3105 or 8011, can be matched with PE, butyl rubber, silicone and other inner pads to enhance sealing.

- Anti-theft design: rolled anti-theft ring, which shows tampering signs (such as broken ring) after opening.

- Environmental protection: supports non-PVC inner pads and meets food-grade safety standards.

Appearance and printing of aluminium ROPP caps:

- Color: conventional gold, silver black, red, white, blue, green, etc., other colors can be customized.

- Decoration process: supports silk screen printing, laser engraving, spraying, metal labeling, etc.

- LOGO customization: minimum order quantity 10,000 pieces, design draft required.

Core advantages of ROPP aluminum screw caps:

- Anti-theft: the anti-tampering ring breaks after opening, which intuitively shows the integrity of the package.

- Sealing: the liner or inner plug design ensures that the product does not leak liquid or air during transportation and storage.

- Aesthetics: high-precision printing technology can achieve complex patterns and multi-color gradient effects to enhance brand recognition.

Main applications of ROPP aluminium screw caps:

- Wine and beverages:

Wine, liquor, mineral water, etc., such as French Remy Martin, Hennessy and other high-end brands use multi-color printed aluminum caps to enhance product grade.

- Medicines and health products:

Pharmaceutical packaging that requires tamper-proof sealing, such as oral liquid and capsule bottles.

- Cosmetics and personal care:

Bottled products such as lotions and essences that require both sealing and aesthetics.