Aluminium Closure Sheets For Bottle Caps

Introduction

Aluminium closure sheets have become a cornerstone in the packaging industry, particularly for bottle caps. As a leading manufacturer and wholesaler, Huawei Aluminum specializes in producing high-quality aluminium closure sheets tailored for various applications. 

Application Scope of Aluminium Closure Sheets

Aluminium closure sheets are versatile and find applications in:

• Beverage Caps: Including soda, beer, and mineral water bottle caps.

• Wine Caps: For sealing and preserving the quality of wine.

• Cosmetic Caps: For perfume, skincare, and makeup bottles.

• Pharmaceutical Caps: For oral liquids and infusion bottles.

• Specialty Caps: Such as anti-theft caps and oil caps.

Specifications of Aluminium Closure Sheets

Here are the key specifications:

• Alloy: 1060, 3003, 3104, 3105, 5052, 5182, 8011 (most common for bottle caps).

• Temper: H18, H19, H22, H24, H26, H14, H16. Common combinations include 8011-H14 and 3003-H16.

• Thickness: Ranges from 0.15 to 0.5mm, with common thicknesses at 0.17mm-0.23mm.

• Width: From 500mm to 2500mm.

• Rolling Process: Continuous Casting (CC) or Direct Chill (DC) casting.

Common Dimensions:

Performance Indicators

Surface Requirements:

• The surface must be flat, smooth, and free from defects like roller marks, black lines, oil spots, dust inclusions, scratches, and bright strips.

Surface Treatments:

1. Pass Oil: Applied to facilitate stamping and shaping.

2. Pre-Print Coating: Epoxy varnish to enhance adhesion for printing.

3. Anodized Mirror Coloring: For high-end cosmetic caps.

4. Degreasing and Cleaning: General cleaning to meet customer requirements.

5. Passivation Treatment: To increase adhesion and provide corrosion resistance.

Mechanical Properties:

• Tensile Elongation: For 8011-H14, 0.2-0.3mm, the tensile strength is 125-155MPA, slightly different from ordinary aluminium sheet standards.

• Tolerance: For 0.2-0.3mm sheets with width > 500mm, the tolerance is ±2.0mm, stricter than ordinary aluminium sheets.

• Earing Rate: Must be ≤3%, a requirement unique to bottle cap materials.

Aluminium Bottle Cap Production Process

The production process includes:

1. Stamping Forming: Aluminium sheets are shaped into caps using blanking and stretching dies.

2. Surface Treatment: Cleaning and treating the surface for optimal performance.

3. Screening Chips: Removing metal chips from the stamped caps.

4. Cleaning: Washing with clean water and detergent to remove impurities.

5. Drying: Drying the caps to prepare for packaging or further processing.

6. Packaging: Caps are packaged or proceed to riveting for final assembly.

Table: Comparison of Mechanical Properties

Why Choose Aluminium Closure Sheets?

• Durability: Aluminium provides robust protection against physical damage.

• Seal Integrity: Ensures an airtight seal, crucial for beverage and wine preservation.

• Aesthetic Appeal: Can be embossed, colored, or printed for branding purposes.

• Eco-Friendly: Highly recyclable, reducing environmental impact.

• Cost-Effective: Lightweight and efficient in production, reducing shipping and handling costs.