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Why coffee bag need foil material inside and exhaust valve?

times   2018-08-28

For the coffee bags with valve, there must be a layer of aluminum film inside, and the aluminum film should have an exhaust valve, the specific effects are as follows. 

Aluminum film is used to seal food and block the external environment;

The exhaust valve on the aluminum film is used to release the gas in the bag (the coffee beans will breathe to release carbon dioxide);

Aluminum film with exhaust valve, can help the buyer smell the coffee beans, so as to better judge the quality of coffee beans.      

At present, in the food packaging, aluminum film is often used for coating to seal the packaging of food; but in order to ensure the safety of things, the aluminum film generally does not directly contact the food, and a composite material such as PE adheres to the surface to ensure food safety.