The material of the Metal Closure

There are various materials for metal bottle caps, and the characteristics and application scenarios of different materials are as follows:
1. Common metal materials and characteristics
aluminium
Characteristics: lightweight, corrosion-resistant, easy to process and form, complex structures can be manufactured by stamping process; The surface can be printed or laminated to enhance aesthetics.
Apply:
Aluminum anti-theft cover: widely used for sealing alcoholic and carbonated beverages (such as beer);
3105 aluminum alloy: specially used for red wine bottle caps, taking into account oxidation resistance and processing performance.

Tinplate (tinned steel).
Characteristics: high hardness, high temperature resistance sterilization treatment, suitable for long-term storage needs.
Application: Canned food, milk powder cans and other sealing scenarios that need to be sterilized at high temperature.

Stainless steel
Characteristics: strong corrosion resistance, oxidation resistance, long service life, but high cost.
Application: high-end cosmetics, chemical reagent bottles and special food packaging.

Galvanized steel
Characteristics: low cost, drop resistance and moderate corrosion resistance.
Application: Simple packaging (e.g. low-end beverage bottle caps).

2. Composite material design
Aluminum-plastic construction: The aluminium lid is lined with a plastic liner (e.g. silicone gasket) to improve tightness and allow for repetitive opening56.
Surface treatment process: such as coating, printing, etc., to enhance anti-counterfeiting identification or corrosion resistance 12.