The aluminum foil substrate used for beverage caps is a thin sheet material made from high-purity aluminum through rolling, annealing, coating, and other processing steps. It is widely used in the production of caps for carbonated beverages, mineral water, juices, energy drinks, and dairy products.

The aluminum foil substrate for beverage caps is typically made of 8011 alloy (the most widely used), 1235 alloy, or 3105 alloy, annealed in the O temper. These alloys possess high purity and excellent flexibility. The foil thickness is usually between 0.015 mm and 0.050 mm. Yogurt and jelly cup lids may use thinner foil, while screw caps for bottled wine or beverages (such as ROPP caps) use thicker foil.

Common Alloys and Specifications

Advantages of Aluminum Foil Substrate for Beverage Caps

1. Excellent Sealing Performance

Aluminum caps create an airtight seal with the bottle mouth, effectively preventing carbon dioxide leakage.
This maintains the freshness and taste of carbonated beverages and extends shelf life.

2. Environmentally Friendly & Recyclable

Aluminum is 100% recyclable, making it an ideal material for sustainable packaging.

3. Flexible Processing

The foil substrate supports coating, printing, and lamination to meet various packaging requirements.

4. Strong Corrosion Resistance

Aluminum naturally forms a protective oxide layer that prevents corrosion from acidic contents inside beverages.
With surface treatments, its corrosion resistance is further enhanced, ensuring product safety.

5. Enhances Brand Value

Bright, smooth aluminum caps can be high-quality printed or laser-engraved to improve product appearance and brand image.

Applications of Aluminum Foil Substrate in Bottle Caps

1. Aluminum Screw-On Tamper-evident Caps (ROPP)

Aluminum screw-on tamper-evident caps are commonly used for mineral water, natural water, non-alcoholic and alcoholic beverages, health products, and juices. These caps are made from aluminum of specific specifications, with common sizes including 28x15.5mm, 28x18mm, 31.5x18mm, and 38x18mm.

2. Easy-Open Caps

Easy-open caps are commonly found in packaging for carbonated beverages, juices, soft drinks, and beer. They are typically made from different grades of aluminum alloy; the can body often uses aluminum 3004 alloy or aluminum 3104-H19 alloy, while the cap or seal usually uses aluminum 5182 alloy.

3. Screw Caps and Other Types

Aluminum foil substrates are also widely used in screw caps, crown corks, push-button caps, and many other cap types. These caps are widely used in beverages, pharmaceuticals, food, cosmetics, and many other fields.