Have you noticed that almost all good price and quality coffee bean packaging now has a round, hard part with a small hole? The scientific name of this breathable hole is "one-way exhaust valve". The one-way exhaust valve, to put it more simply, is that this valve is only out but not in.

What is the purpose of the vent valve on the good price and quality coffee bean packaging?
1. Exhaust only (anti-swell bag):
For a period of time after coffee beans are roasted, they will continue to release carbon dioxide several times the volume of the coffee beans themselves. In order to prevent the coffee bean packaging from bursting and be isolated from sunlight and oxygen, a one-way exhaust valve is designed to be installed on the good price and quality coffee bean packaging to discharge excess carbon dioxide out of the bag.
2. No air intake (coffee preservation):
In addition, the one-way exhaust valve can also block the oxygen outside the coffee bean package from entering the bag, so as to prevent the coffee beans from oxidizing and causing the aroma to be quickly released, thus absolutely ensuring the unchanged coffee bean flavor.
3. Additional effect: smell the fragrance
When purchasing coffee, you can squeeze the packaging bag and smell the aroma of coffee through the exhaust valve on the good price and quality coffee bean packaging!