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2025-09-23 07:21:02
Aluminum bottle caps are widely used in the beverage industry due to their lightweight, corrosion resistance,recyclability, and ability to maintain product freshness. Selecting the right material grade is crucial for ensuring safety, performance, and compatibility with different types of beverages, such as soft drinks, beer, or juices.
1. Aluminum 3104 H19
Characteristics:High corrosion resistance, excellent formability, and good strength.
Applications: Widely used for crown caps (beer and carbonated drinks) due to its ability to withstand high-speed capping processes.
Benefits: Prevents leakage, maintains carbonation, and is cost-effective.
2. Aluminum 5182 H48
Applications: Often used in twist-off caps for beverages like juices or bottled water.
Characteristics: Stronger than 3104,moderate corrosion resistance, good springback.
Benefits: Offers better mechanical strength for reusable or resealable caps.
3. Aluminum 8011 H18 / H19
Characteristics:Excellent corrosion resistance, very good formability, and safe for food contact.
Applications:Common in food and beverage lids, including soft drink and beer caps.
Benefits: Provides a strong seal, protects flavor, and is compatible with different lining materials.
|
Aluminum Grade |
Temper |
Key Properties |
Common Applications |
Benefits |
|
3104 H19 |
H19 |
High corrosion resistance, excellent formability, moderate strength |
Crown caps for beer, carbonated drinks |
Prevents leakage, maintains carbonation, cost-effective |
|
5182 H48 |
H48 |
Higher strength, moderate corrosion resistance, good springback |
Twist-off caps for juices, bottled water |
Stronger for resealable caps, good mechanical durability |
|
8011 H18/ H19 |
H18 / H19 |
Excellent corrosion resistance, very good formability, food-safe |
Soft drink caps, beer caps, food beverage lids |
Ensures seal integrity, protects flavor, compatible with lining materials |
Temper: The aluminum coil supplied for caps is usually in an "H14" or "H16" temper (strain hardened, then partially annealed). This specific temper ensures the right balance of strength and formability for the cap manufacturing process.
Thickness: The thickness of the aluminum sheet is carefully controlled, typically ranging from 0.20mm to 0.23mm, to ensure proper sealing and ease of opening.
Coatings: The aluminum is almost always coated on both sides with food-grade lacquers. The inner coating provides chemical resistance to the beverage, and the outer coating allows for printing and provides scratch resistance.
In summary, when discussing aluminum bottle caps for beverages, 8011 aluminum alloy in a specific temper is the primary material grade you'll encounter.
