In the modern beverage packaging industry, the choice of bottle caps is crucial. With increasing consumer demands for quality, environmental sustainability, and safety, aluminum alloy sheets have become the material of choice for bottle caps due to their excellent performance and multiple advantages.

Beverage bottle closure caps made from aluminum alloy sheets typically use 3000 or 5000 series aluminum alloys, such as 3104 and 5052, which are commonly used in aluminum alloy cap materials.

3000 Series (Aluminum-Manganese Alloy)

• Typical Grades: 3003, 3004, 3104

• Features: Contains 1.0-1.5% manganese, excellent rust resistance, high elongation, easy to form.

• Applications: Non-carbonated beverage bottle caps (such as juice and water), pull tabs for cans.

5000 Series (Aluminum-Magnesium Alloy)

• Typical Grades: 5052, 5182

• Features: Contains 3-5% magnesium, high strength, excellent fatigue resistance, strong corrosion resistance.

• Applications: Carbonated beverage bottle caps (such as soda), beer bottle caps.

Aluminum Closure Cap Specifications

Advantages of aluminum closures sheet for beverages

1. Excellent Sealing Performance: Aluminum alloy caps ensure a tight seal with the bottle neck, effectively preventing air, moisture, and bacteria from entering, keeping beverages fresh and preserving flavor.

2. Lightweight and High Strength: Aluminum alloy is lightweight yet strong, able to resist impact and pressure during transportation, reducing shipping costs.

3. Strong Corrosion Resistance: Aluminum alloys are highly resistant to corrosion when in contact with acidic beverages, ensuring the safety and quality of drinks, and making them suitable for carbonated drinks and juices.

4. Eco-friendly and Recyclable: Aluminum alloy is 100% recyclable, with a high recycling efficiency that reduces environmental impact and meets the demand for green packaging.

5. High Gloss and Aesthetic Appeal: The smooth surface of aluminum is ideal for high-quality printing, enhancing the visual appeal of the brand and increasing market competitiveness.

6. Enhanced Consumer Experience: Aluminum caps provide a great opening experience, are easy to open, and help boost consumer loyalty and brand satisfaction.

Aluminum closure sheet printing process

Aluminum Sheet: The aluminum sheet must undergo chemical cleaning or sandblasting to remove surface oils and oxide layers, ensuring good ink adhesion.

Primer Treatment: This treatment enhances the adhesion between the coating and the aluminum. It is often performed with phosphate-chromate or zirconium treatments, followed by cutting operations.

Surface (Inner Wall) Coating: Depending on the product, the order of surface and inner wall treatments may vary.

Surface Printing: Multiple printing processes are applied to create the design on the bottle or can lid.

Topcoat: A glossy finish is applied.

Cutting: The aluminum sheet is cut into three equal parts using a single-cut method. There are also products with edge trimming on both ends.