The one-way exhaust valve releases carbon dioxide from the coffee bag but does not absorb the outside air into the bag, leaving the coffee bag in a state that only in and out, in order to ensure the quality of the coffee.
The release of carbon dioxide also removes some of the aroma from the beans, so generally the fresh beans will not last long, even if the one-way exhaust valve is of good quality.
On the contrary, some so-called one-way exhaust valves on the market are not "one-way", and some of them have very poor durability. Therefore, businesses need to test them constantly before using them, and you also need to pay more attention when buying coffee beans.
In addition to one-way exhaust valves, some companies use deaerators, which remove both carbon dioxide and oxygen at the same time, but also absorb some of the coffee's flavor. The flavor of the coffee produced in this way is weakened, and even if it has been aged for a short time, it can give the impression that the coffee has been aged too long.
To sum up:
The bulging of coffee packaging is a normal release of carbon dioxide from the beans, rather than something like spoilage. But if there are bursting bags and so on, and the packaging of the business has a great relationship, you can pay attention to the purchase.
Another note: When buying coffee, try not to squeeze through the one-way exhaust valve to smell the aroma. This will easily cause air to flow in, and eventually accelerate the loss of aroma and oxidation of coffee beans.
Why does the bag of freshly roasted coffee bulge
Whether you go to a coffee shop to buy coffee or buy coffee on the Internet, we will often encounter such a situation, is the coffee bag bulging, feel like a leak. Many people think that this kind of coffee belongs to bad coffee, but is this really the case?
As for this flatulence problem, Lu researched many books, consulted a lot of relevant information on the Internet, and also consulted some baristas to get the answer.
During the roasting process, carbon dioxide is produced. At the beginning, carbon dioxide only adheres to the surface of the coffee beans. As the roasting is completed and the storage time increases, carbon dioxide will gradually be released from the surface to support the packaging.
In addition, the amount of carbon dioxide is very much related to the degree of roasting coffee. There are sample pouches packaging. More highly roasted coffee beans tend to emit more carbon dioxide in most cases, with 100 grams of roasted coffee beans likely to produce 500cc of carbon dioxide, compared to less roasted coffee beans.
Sometimes, a large amount of carbon dioxide release may burst the packaging of coffee beans, so for safety and quality concerns, it is necessary to find a way to release carbon dioxide, while not letting coffee beans too much contact with oxygen, so many manufacturers adopt one-way exhaust valves.
The one-way exhaust valve releases carbon dioxide from the coffee bag but does not absorb the outside air into the bag, leaving the coffee bag in a state that only in and out, in order to ensure the quality of the coffee.
The release of carbon dioxide also removes some of the aroma from the beans, so generally the fresh beans will not last long, even if the one-way exhaust valve is of good quality.
On the contrary, some so-called one-way exhaust valves on the market are not "one-way", and some of them have very poor durability. Therefore, businesses need to test them constantly before using them, and you also need to pay more attention when buying coffee beans.
In addition to one-way exhaust valves, some companies use deaerators, which remove both carbon dioxide and oxygen at the same time, but also absorb some of the coffee's flavor. The flavor of the coffee produced in this way is weakened, and even if it has been aged for a short time, it can give the impression that the coffee has been aged too long.
To sum up:
The bulging of coffee packaging is a normal release of carbon dioxide from the beans, rather than something like spoilage. But if there are bursting bags and so on, and the packaging of the business has a great relationship, you can pay attention to the purchase.
Another note: When buying coffee, try not to squeeze through the one-way exhaust valve to smell the aroma. This will easily cause air to flow in, and eventually accelerate the loss of aroma and oxidation of coffee beans.
The one-way exhaust valve releases carbon dioxide from the coffee bag but does not absorb the outside air into the bag, leaving the coffee bag in a state that only in and out, in order to ensure the quality of the coffee.
The release of carbon dioxide also removes some of the aroma from the beans, so generally the fresh beans will not last long, even if the one-way exhaust valve is of good quality.
On the contrary, some so-called one-way exhaust valves on the market are not "one-way", and some of them have very poor durability. Therefore, businesses need to test them constantly before using them, and you also need to pay more attention when buying coffee beans.
In addition to one-way exhaust valves, some companies use deaerators, which remove both carbon dioxide and oxygen at the same time, but also absorb some of the coffee's flavor. The flavor of the coffee produced in this way is weakened, and even if it has been aged for a short time, it can give the impression that the coffee has been aged too long.
To sum up:
The bulging of coffee packaging is a normal release of carbon dioxide from the beans, rather than something like spoilage. But if there are bursting bags and so on, and the packaging of the business has a great relationship, you can pay attention to the purchase.
Another note: When buying coffee, try not to squeeze through the one-way exhaust valve to smell the aroma. This will easily cause air to flow in, and eventually accelerate the loss of aroma and oxidation of coffee beans.