Aluminum Packaging Material: Aluminum Coil for Closure

Aluminum packaging material occupies an important position in the packaging field due to their outstanding characteristics, especially in bottle cap packaging.

Alloys of aluminum bottle cap material

1xxx series aluminum alloy: belongs to the pure aluminum series, with extremely high aluminum content and purity of more than 99.00%. The cost is relatively low and it is widely used in some ordinary bottle cap packaging that does not require high strength.

3xxx series aluminum alloy: represented by 3003, 3004, etc. The main alloying element is manganese, and the manganese content is between 1.0-1.5. In bottle cap packaging, it can meet certain stamping and forming requirements and is suitable for bottle caps with certain requirements for strength and corrosion resistance, such as some beverage bottle caps.

5xxx series aluminum alloy: Typical grade is 5052 aluminum sheet. It is often used for some high-end wines or bottle cap packaging with high corrosion resistance requirements.

8011 aluminum alloy: This is one of the commonly used alumum foil sheet for making bottle caps. The aluminum caps made of it are thin and easy to open. They are widely used in pharmaceutical oral liquid bottle caps, beer caps, red wine caps, beverage bottle caps, etc.

Aluminum coil for closure is easy to process and can adapt to a variety of bottle cap processing techniques. They can be quickly formed through stamping processes to make bottle caps of various shapes; in the stretching process, they can also show good processing adaptability and produce bottle caps of different heights and diameters.

At the same time, aluminum coils also have good weldability, and can meet the processing requirements for some bottle cap production that requires welding processes, such as the production of two-piece bottle caps.

Aluminum coil surface treatment

DOS oiling: DOS is dioctyl sebacate, a commonly used lubricant. The main function of DOS oiling on the surface of aluminum coils is to improve the processing performance of aluminum coils. In the stamping, stretching and other processing processes of bottle cap production, aluminum coils coated with DOS oil can reduce the friction between the mold and the mold, reduce the probability of scratches, cracks and other problems during processing, and improve the smoothness of processing and the yield rate. At the same time, this oiling treatment can also protect the surface of the aluminum coil to a certain extent, preventing minor damage caused by friction during storage and transportation.

In addition, DOS oil has good volatility and can gradually evaporate during subsequent processing or use. It will not leave obvious residues on the surface of the bottle cap and will not affect the appearance and performance of the bottle cap. Therefore, it is more common in the processing of bottle cap aluminum coils in the food, beverage, and pharmaceutical industries.

Color coating: Color coating can give aluminum coils rich colors. Various colors can be formulated according to the needs of different products to meet the requirements of bottle caps for appearance beauty and brand recognition.

At the same time, the coating can also play a certain protective role, enhance the corrosion resistance, weather resistance and wear resistance of aluminum coils, so that bottle caps are not easy to fade, rust or wear during long-term use and storage.

The coating used for color coating must comply with relevant industry standards, especially in the field of food and pharmaceutical packaging, to ensure that the coating is non-toxic, harmless, and does not release harmful substances. Common color coating processes include roller coating, etc., which can ensure that the coating is uniform, smooth, and firmly adhered.

Color printing: Color printing is to print various patterns, texts, logos, etc. on the surface of aluminum coils through printing technology. Unlike the pure color coating of color coating, color printing can achieve more complex and delicate decorative effects. The brand logo, product information, exquisite patterns, etc. can be clearly printed on the surface of aluminum coils, which can enhance the personalization and brand added value of bottle caps.

The thickness of aluminum coils used for bottle cap packaging has a wide range. For example, the thickness of 8011 aluminum coils is generally 0.15-0.27mm. The width specifications of aluminum coils are usually customized according to the bottle cap production equipment and actual needs. The common width range is 330-1000mm.

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