3105 H14/H16 Aluminum Closure Sheet For Screw Caps

3105 H14/H16 aluminum sheet is a commonly used aluminum alloy sheet, particularly suitable for applications requiring good formability, moderate strength and good corrosion resistance. 3105 aluminum closure sheet is widely used in the manufacture of screw caps (such as beverage bottles and wine bottles) due to its excellent machinability. 3105 aluminum sheet belongs to the Al-Mn alloy series and is one of the most widely used rust-resistant aluminum alloys. It exhibits good corrosion resistance in atmospheric and freshwater environments, making it particularly suitable for the sealing requirements of long-term storage of wine and beverages, preventing packaging contamination problems caused by material corrosion.

Properties of 3105 aluminum closure sheet for screw caps:

Alloy composition:

3105 aluminum sheet contains approximately 98% aluminum, along with 0.6% silicon, 0.8% iron, 0.3% copper, 0.3-0.8% manganese, and 0.2-0.8% magnesium.

Work hardening conditions:

H14 and H16 indicate the work-hardened state of the aluminum sheet. Where H represents the work-hardened state, and 14 indicates that the sheet has undergone a certain degree of cold working, with tensile strength and hardness between H12 and H16; H16 has a higher degree of cold working, resulting in higher strength and hardness.

H14: Tensile strength 130–160 MPa, yield strength ≥115 MPa, elongation ≥4%, strain hardened to semi-hard state (between H12 and H16).

H16: Tensile strength 150–180 MPa, yield strength ≥135 MPa, elongation ≥3%, strain hardened to 3/4 hard state, higher strength but slightly lower ductility.

Dimensions:

3105 aluminum sheets for bottle caps are typically 0.15-0.3 mm thick and 500-2500 mm wide.

Performance characteristics of 3105 aluminum closure sheet for screw caps:

Good corrosion resistance:

After anodizing, 3105 aluminum sheet forms a protective aluminum oxide film, providing excellent atmospheric corrosion resistance. This ensures that bottle caps are not prone to rusting during storage and use, maintaining their aesthetic appearance.

Suitable mechanical properties:

H14 and H16 temper 3105 aluminum sheet possesses sufficient strength and hardness to meet the requirements of threaded bottle caps, while also exhibiting some plasticity for easy processing. H16 temper aluminum sheet offers even higher strength, making it suitable for bottle caps requiring high sealing and tightness.

High surface finish:

Facilitates subsequent printing, coating, or anodizing treatments.

Excellent machining performance:

3105 aluminum sheet has excellent deep-drawing properties, allowing it to be processed into various shapes of screw caps through stamping, stretching, and other processes, with minimal defects such as cracks during processing.

Food safety:

This aluminum sheet complies with relevant food packaging material standards (such as FDA) and is safe for use in the production of bottle caps for alcoholic beverages, soft drinks, and pharmaceuticals without contaminating the contents.

Application advantages of 3105 aluminum closure sheet for screw caps

Cost advantages:

3105 aluminum sheet offers strong cost-effectiveness. While its price is influenced by aluminum ingot prices, processing fees, and specifications, its overall cost is lower compared to other high-strength alloys (such as 5052 and 6061), making it suitable for large-scale bottle cap production. Its high plasticity and low scrap rate reduce material waste during production, improving overall efficiency.

Surface quality:

After rolling and other processes, 3105 aluminum closure sheet has a smooth and flat surface, free from defects such as rolling marks and oil spots. It can be directly used for printing or painting, resulting in clear and vibrant bottle cap designs that meet aesthetic requirements. For example, brand logos are often printed on wine bottle caps, and the superior surface of 3105 aluminum sheet ensures clear and legible designs.

Typical applications of :

Wine bottle caps:

3105 H14/H16 aluminum sheet is widely used for sealing bottled products such as beer, spirits, and wine. Its rust-proof properties ensure leak-proof performance during long-term storage, and its deep-drawing performance adapts to different bottle designs.

Beverage bottle caps:

High-pressure packaging for carbonated beverages, juices, etc., requires extremely high cap strength. 3105 H16 aluminum sheet, through its high work hardening state, meets these sealing requirements.

Cosmetic bottle caps:

Balancing lightweight and aesthetics, 3105 aluminum sheet’s malleability supports complex design shapes, while its corrosion resistance protects product quality.