Aluminum foil coffee bags have excellent barrier properties and can effectively prevent coffee beans from coming into contact with light and air, thereby preventing the aroma of coffee beans from being released and oxidized. This type of packaging bag is usually made of aluminum-plastic composite material, which has good water and oxygen isolation functions and can effectively protect the freshness and quality of coffee beans. It has the following advantages:
（1）Strong sealing : The opening of the zipper coffee bag has a zipper structure, which can be opened or sealed at any time. This design makes the bag have good sealing, which can effectively maintain the freshness and flavor of the coffee and extend the shelf life of the coffee.
（2）Fresh-keeping performance : Aluminum foil has excellent sealing and barrier properties, and can tightly wrap coffee beans to prevent the intrusion of oxygen, moisture and odor, effectively slowing down the volatilization of aroma components in coffee beans and the oxidation and deterioration of oils, thereby greatly extending the shelf life of coffee beans and ensuring that every cup of coffee can retain its original freshness and purity.
（3）Shading effect : The aluminum foil material is almost completely opaque, providing a dark protective layer for the coffee beans, effectively preventing light from damaging the coffee beans, maintaining the original color and aroma of the coffee beans, and especially preventing the adverse effects of ultraviolet rays on the preservation of coffee beans.
（4）Barrier performance : The aluminum foil layer can effectively isolate light, oxygen, moisture and odor, thereby maximizing the freshness and original flavor of the coffee beans. In addition, the aluminum foil bag also has good sealing and pressure resistance, ensuring that it is not easily damaged during transportation and storage .