What is the exhaust valve coffee bag one-way exhaust valve role of coffee beans exhaust and oxidation

I believe that people who love coffee have the experience of buying coffee beans, and we all know that the degassing valve is an important part of coffee packaging. Because roasted coffee beans are very easy to oxidize, this will make the coffee lose its flavor and deteriorate the coffee oil. So roasted coffee beans should be kept in a closed, low-temperature environment as far as possible, away from strong light. So the exhaust valve is very important, and many roasters use coffee packaging with exhaust valves. Today let's take a look at what exhaust valves are and whether they are important to coffee packaging.

What is an exhaust valve?

The exhaust valve is an one-way vent that allows coffee beans and coffee powder to slowly release carbon dioxide (CO2) and other volatile gases from the bag without contact with the outside air.

When coffee is baked, many chemical reactions take place. Volatile gases, mainly CO2, are formed in beans. These gases actually add flavor to the coffee, but the problem is that they continue to release for a period of time. After baking, the accumulated CO2 began to seep out slowly (mostly within a few days). But it could take weeks before it all disappears. The valve has two important objectives: to allow the release of CO2 and to prevent the entry of oxygen. This process can prevent oxidation and extend the shelf life.

The importance of degassing Valve to Coffee Packaging

Now, let's delve into three main reasons why the degassing valve is so important.

Keep the packing shape

The exhaust valve helps the coffee package maintain its shape by allowing the gas to escape. Gas is released after baking and continues to be released even after the coffee is packaged. If the gas is trapped in the package, this can cause the bag or pouch to expand or expand. Not only does this look bad, but it will eventually cause the package to burst or leak. The exhaust valve provides a place for the gas, that is, outside the bag.

Maximize freshness

The exhaust valve allows volatile gas to escape from the bag while preventing other gases from entering the package, helping to keep the coffee fresh. The main one? Oxygen. When coffee is exposed to oxygen for a long time, it will deteriorate, shorten its shelf life and have a negative impact on flavor. Therefore, the valve can prevent the entry of oxygen.

Improve the efficiency of packaging

Using a degassing valve allows brands to quickly package coffee instead of waiting for all the gas to be released, thus improving the efficiency of the packaging line. In this way, the coffee can be packaged immediately, knowing that the degassing valve will allow all gas to escape in a manner that does not damage the package or the coffee itself.