If you often buy freshly roasted coffee beans yourself, you'll notice that on the back of the bag is what looks like a button, perhaps with a little hole in it called an "air valve."
The purpose of the device is to get carbon dioxide out of the beanbag, because freshly roasted coffee beans must be vented, which is more like breathing.
The purpose of the valve is to help the coffee beans get rid of carbon dioxide, so the valve is a device that keeps the air out of the coffee beans, effectively slowing the aging of the beans.
Fresh coffee beans release carbon dioxide
The roasting process releases some of the carbon dioxide in the coffee beans, but most of the carbon dioxide remains in the beans, so the beans slowly drain out of the gas for about two weeks after roasting.
If the bag doesn't have an air valve to help vent the beans, the beans in the bean bag will continue to vent, which will cause the bean bag to overexpand. There are eco stand up pouches. If the storage environment causes squeezing, it can cause the bean bag to pop and ruin the beans' preservation. (You may notice it half a day or several days later, when the beans have gone stale from exposure to the air.)
Air damage to coffee quality
The coffee bag valve is a one-way valve. In addition to expelling the beans, the valve also prevents the outside air from seeping into the bean bag and affecting the quality of the beans.
We use oxygen, humidity and temperature, which can shorten the best tasting period and destroy the quality of the beans. So it's very important to get the gas out without letting the air in.
Squeeze a bean bag to smell?
It's important to note that when the carbon dioxide is released, it also releases a lot of the aroma of the beans, which is why when we squeeze the bean bag, we get a great smell from the bean bag valve. It's just that this smell is not the intention of the bean bag valve, because the carbon dioxide actually helps keep the beans fresh, and the air pressure inside the bag also helps to keep the beans healthy. In addition, the movement of squeezing coffee beans will also lose aroma, affecting the quality of coffee beans, so try to avoid squeezing coffee bags to smell the aroma.
In addition, the quality of the air valve is also divided. When purchasing, you can confirm the air valve used by bean bags with the shop, which can more effectively maintain the freshness of coffee!
Summarize the function of the air valve
Moisture-proof: Effectively keep coffee beans dry and mellow flavor, air moisture can not run into the bag.
Buffering: The air in the coffee bag can be discharged from the one-way exhaust valve to reduce the impact of the residual gas in the bag and avoid the bursting of the package when the coffee bag is struck or dropped from a height.
Exhaust: After the coffee is roasted, it can effectively discharge the carbon dioxide in the bag to avoid the situation of packaging bursting.
In addition, for those of you who have flown with coffee beans, you may find that when you disembarkation, the bag has a dried, vacuum-rice packaging. This can also affect the flavor and preservation of fresh coffee, as cabin pressure squeezes the air out of the bag. Just tape the valve and put it in a chain bag to protect the coffee beans. Try it next time.