The aluminum foil layer in composite cans serves multiple purposes:
1. Barrier Protection: Aluminum foil is an excellent barrier against moisture, oxygen, and light. By incorporating an aluminum foil layer in the composite can, it helps to prevent the penetration of these external elements into the package. This barrier protection helps to maintain the freshness, flavor, and quality of the contents for a longer shelf life.
2. Preservation of Aroma and Flavor: Aluminum foil is known for its ability to seal in the aroma and flavor of the packaged products. It prevents the loss of volatile compounds that contribute to the taste and scent of the contents. This helps to preserve the original aroma and flavor of the product, ensuring a delightful consumer experience.
3. Protection from External Factors: The aluminum foil layer acts as a protective shield against external factors such as light, moisture, and oxygen. It helps to prevent the degradation of the contents caused by exposure to these elements. This protection ensures that the product remains fresh and unaffected by external influences.
Overall, the aluminum foil layer in composite cans plays a crucial role in maintaining the quality, freshness, and integrity of the packaged products by providing an effective barrier against moisture, oxygen, and light.