When we buy coffee beans, we can often see that there is a white one-way exhaust valve on the customized Coffee bean packaging, and there is a silver film inside the customized Coffee bean packaging, so what do these two things do?

The white valve is a one-way exhaust valve. The roasted coffee beans will naturally emit carbon dioxide. If they remain in the package, the quality of the coffee beans will be affected. With this one-way exhaust valve, the customized Coffee bean packaging can discharge the carbon dioxide produced, so as to ensure that the quality of the coffee beans is not damaged.
The silver film inside the customized Coffee bean packaging is similar to tin foil, which we professionally call aluminum foil. Aluminum foil can play the role of moisture-proof, light-proof and barrier, preventing coffee beans from coming into contact with light and air, which leads to the emission and oxidation of coffee beans' aroma.
The customized Coffee bean packaging uses aluminum foil and a one-way exhaust valve, which can better avoid the entry of air and keep the coffee beans fresh and original.