What is the "small hole" of the coffee bag used for?

Beente, as a manufacturer specializing in the production of coffee packaging bags, we who are obsessed with coffee recently bought a batch of freshly roasted coffee beans.

Have you noticed that almost all coffee packaging bags now have a round, hard, and small hole. The scientific name of this breathable hole is "one-way exhaust valve". The one-way exhaust valve, to put it in a simpler way, is that this valve only goes out and does not enter.

Its function: anti-swelling bag + guarantee coffee quality

1. Exhaust only (anti-swelling bag):

After roasting, the coffee beans will continue to release carbon dioxide larger than the volume of the coffee beans for a period of time. In order to prevent the coffee bag from bursting and isolate it from sunlight and oxygen, a one-way exhaust valve is installed on the coffee packaging bag. , And drain the 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 bag from entering the bag, preventing the coffee beans from oxidizing and causing the aroma to quickly spread, thus absolutely ensuring that the flavor of the coffee beans remains unchanged.

3. Additional function: smell the fragrance

Of course, you can also squeeze the packaging bag when buying coffee, and smell the aroma of coffee through the coffee exhaust valve!