The self-adhesive aluminum foil sealing film is usually composed of multiple layers of materials, which mainly include:

1. 1. Aluminum foil layer: Aluminum foil is one of the main components of this sealing film and has excellent oxygen, moisture and barrier properties. Aluminum foil can effectively prevent the entry of external gases, moisture and light, ensuring the quality and shelf life of encapsulated items.

2. 2. Self-adhesive layer: The self-adhesive layer is another important part of the sealing film. It is located on one side of the aluminum foil layer and is used to bond the sealing film during the sealing process. This self-adhesive layer is usually made of hot melt adhesive or other adhesives to ensure the firmness of the seal.

3. Bottom material: On the other side of the aluminum foil layer, there may be a layer of bottom material. This layer of material is usually combined with the self-adhesive layer to form the basis of the entire sealing film. The bottom material may be polyethylene (PE) or other plastic materials, which have certain flexibility and durability.

This self-adhesive aluminum foil sealing film is widely used in food packaging, pharmaceutical packaging, cosmetic packaging and other fields. Its main function is to maintain the freshness of the internal items, extend the shelf life, and provide effective barrier protection. Due to the excellent properties of aluminum foil, this sealing film is also commonly used in special environments where external light and gas need to be isolated.