MC Aluminum provides custom-sized 4 feet x 8 feet (4'x8', 1219mm x 2438mm) aluminum sheets, mainly using 8011 and 3105 alloys. These alloys are ideal raw materials for manufacturing various ROPP (Roll-On Pilfer-Proof) caps. Our products offer excellent deep drawing performance, stable mechanical properties, and superior surface quality, ensuring high-efficiency, low-waste production of high-quality caps.

Material Overview

8011 Aluminum Alloy

8011 belongs to the aluminum-iron-silicon series, featuring excellent deep drawing performance and high strength. Its good fatigue resistance makes it particularly suitable for caps requiring repeated twisting. With better performance than pure aluminum foil, it is widely used in the packaging industry.

3105 Aluminum Alloy

As part of the aluminum-manganese series, 3105 aluminum closure sheets are known for excellent corrosion resistance and good electrical conductivity. Containing 0.3% copper, its conductivity reaches up to 41%. In annealed (O) temper, it has high plasticity, making it ideal for deep drawing. It also exhibits good weldability and corrosion resistance, making it highly suitable for cap production.

Advantages of Choosing 4×8 Standard Large Sheets

Optimized Layout Efficiency: Large-sized sheets allow manufacturers to arrange caps densely for punching, minimizing scrap and maximizing material utilization.

Improved Production Efficiency: Standardized dimensions are compatible with mainstream high-speed stamping equipment, reducing material changeover and increasing continuous production efficiency.

Aluminum Sheet Specifications for Bottle Caps

Performance Advantages of 3105/8011 ROPP Cap Aluminum Sheets

1. Excellent Deep Drawing Performance

Both 8011 and 3105 sheets, especially in O temper, have high plastic elongation, allowing complex deep drawing deformation on high-speed presses without cracking or wrinkling. This ensures one-step forming of cap shells, greatly improving production yield.

2. Superior Rust & Corrosion Resistance

ROPP caps are commonly used for wine, beverages, and health products, which may contain acidic or alkaline liquids. 3105 aluminum, a widely used anti-rust material, effectively resists the corrosive effects of contents and humid air, ensuring caps maintain good appearance and performance throughout shelf life.

3. Excellent Surface Treatment Compatibility

The flat, smooth surface of 8011 and 3105 sheets provides an ideal substrate for coating, printing, and embossing. Whether for luxurious gold plating or high-definition logo printing, both materials achieve vivid colors and clear patterns, helping brands enhance their image.

4. Compliance with Food Safety Standards

As materials in direct contact with food and pharmaceuticals, both 8011 and 3105 aluminum alloys meet strict food safety and hygiene standards, ensuring the safety of the contents and giving manufacturers peace of mind.

Application Areas

• Alcohol & Beverages: Wine, spirits, premium mineral water, functional drinks, etc.

• Health Products & Pharmaceuticals: Nutritional liquids, medicinal reagents, etc.

• Food & Edible Oils: Premium olive oil, condiments, etc.

• Cosmetics & Personal Care: Perfumes, essential oils, high-end skincare products.

ROPP Cap Aluminum Sheet Quality Requirements

1. Surface Quality & Coating Preparation

• Surface Cleanliness: Ensure sheets are free from oil, oxidation, scratches, or dents, providing a perfect substrate for printing and inner lacquering.

• Flatness: Excellent sheet flatness prevents ink unevenness or misalignment during high-speed printing.

2. Mechanical Properties & Formability

• Erichsen (Cup) Value: Strictly controlled to ensure sheets do not crack or form ears during deep drawing and thread rolling; values depend on thickness and temper.

• Hardness & Tolerance: Hardness (e.g., Vickers Hv) must remain within customer-specified range. Thickness tolerance is precisely controlled to ±0.01mm, ensuring cap size consistency and sealing reliability.