With the increasing demand for packaging materials in the food, medicine, beverage and other industries, aluminum bottle caps have been widely used in the market due to their excellent sealing, corrosion resistance and printability. Among them, the printed aluminum plate for screw caps mainly uses 3105 and 8011 alloys. These two materials have their own characteristics and are suitable for different packaging needs.

Introduction to aluminum alloys for aluminum screw caps:

3105 aluminum alloy has good rust resistance, electrical conductivity and excellent mechanical properties, including high shear strength, tensile strength and yield strength. It is easy to process, can adapt to various complex processing processes, and has good weldability, which is very suitable for manufacturing sealing packaging materials such as screw caps. In addition, 3105 aluminum closure sheet also has excellent arc welding performance, which can accept gas welding, contact spot welding and wire welding, further broadening its application range in screw cap manufacturing.

‌8011 aluminum foil‌ is also widely used in the manufacture of screw caps, especially in the packaging of products such as alcoholic beverages. 8011 aluminum foil has good protection function, which can avoid contamination of products by microorganisms, moisture or gas, ensure product safety and extend shelf life. In addition, aluminum bottle caps are easy to recycle, environmentally friendly, and meet the requirements of sustainable development‌.

Characteristics of printed aluminum plates for spiral aluminum caps:

1.Good surface quality: It must have a smooth and flat surface to ensure beautiful and clear printing effects.

2.Appropriate strength and ductility: It must ensure the sealing of the bottle cap and facilitate stamping.

3.Good corrosion resistance: It meets the high standards of food, medicine, cosmetics and other industries.

4.Printability: After surface treatment, it must have good ink adhesion to ensure that the pattern is bright and lasting.

5.Green and environmentally friendly: Aluminum alloy can be fully recycled, which is in line with the sustainable development concept of the modern packaging industry.

Aluminum alloy bottle cap material specifications:

Mechanical properties of printed aluminum plates

Chemical composition of printed aluminum plates (%)

Application areas:

Medical packaging bottle caps: such as antibiotic bottle caps, oral liquid bottle caps, etc.;

Carbonated beverage bottle caps: such as beer, soda, etc. that need to withstand a certain pressure;

Edible oil bottle caps: such as olive oil, condiment bottle caps, etc.;

Cosmetic bottle caps: such as lotion, essence bottle caps and other high-end packaging needs.

Easy-open packaging: suitable for bottle cap designs that need to be easily opened.

Comparison between 3105 aluminum closure sheet and 8011 aluminum foil