The Role Of The Small Hole In The Coffee Bag

If you've ever looked at a coffee bag, you'll notice what looks like a button on the back, maybe with little holes in it, called an air valve.

The purpose of the device is to get carbon dioxide out of the coffee bag, because freshly roasted coffee beans have to 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 bag will continue to vent, which will cause the bag to overexpand. If the storage environment causes squeezing, it can cause the bag to burst 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.)

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Air damage to coffee quality

In the beginning, the coffee bag valve is an outlet device, that is, a one-way valve. The function of the valve is not only to expel gas from the coffee beans, but also to prevent the outside air from seeping into the coffee bag and affecting the quality of the coffee beans.

In another article, we mentioned three major variables that affect coffee bean quality: oxygen, humidity, and temperature, which can shorten the best tasting period and destroy the quality of coffee beans. So it's very important to get the gas out without letting the air in.

Squeeze a coffee bag to smell it?

It's important to note that when the carbon dioxide is released, it also releases a lot of the aroma of the coffee beans, which is why when we squeeze the coffee bag, we get a great smell from the valve. It's just that this smell is not what the valve was designed to do, because the carbon dioxide actually helps keep the beans fresh, and the air pressure inside the bag also helps to feed the beans. 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 aroma.

When purchasing, you can confirm the air valve used by coffee bags with the shop, which can more effectively maintain the freshness of coffee! (The quality of coffee beans is effectively protected by the highest quality air valve made in Italy!)

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Summarize the function of the air valve

1. Moisture-proof: effectively keep the coffee beans dry and mellow flavor, the water in the air can not run into the bag.

2. Buffer: The air in the coffee bag can be discharged from the one-way exhaust valve to reduce the impact caused by the residual gas in the bag and avoid the bursting of the package when the coffee bag is being carried or falls from the height.

3. Exhaust gas: 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 dismount the coffee 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.

https://roastercoffees.com/ can help coffee lovers learn more about coffee bags.