Three side sealing aluminum foil bag

The aluminum-plastic film is made of three to four or more layers by adhesive or lamination method to form a composite film. A typical structure is as follows.

The first layer: This layer can ensure the strength of the packaging bag within a certain temperature and a certain range.

Second layer: aluminum foil, barrier layer. The main function is to prevent moisture, oxygen and light.

The third layer: The innermost layer is the heat sealing layer.