How does the Coffee Bag Work?

June 10,2022

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Can roasted coffee beans be brewed immediately? Yes, but not necessarily good. Freshly roasted coffee beans will have a bean growing period, which is to release carbon dioxide and achieve the best flavor of the coffee. How do we store coffee? When storing coffee beans, we thought of using coffee bags for the first time, but have you carefully observed the packaging bags of coffee beans? Have you noticed a white or transparent valve on the back or inside of the coffee bag? Or did you see it and didn't care? Don't think the air valve is dispensable when you see its small size. The small air valve holds the secret to the "life or death" of coffee beans.


This air valve is what we call a "coffee exhaust valve", which is called a one-way exhaust valve. The one-way exhaust valve plays a vital role in helping your fresh coffee stay fresh longer. The one-way exhaust valve in the coffee bean packing bag is a packing bag accessory to prevent air backflow. Briefly summarize that the function of a one-way exhaust valve has two points: one is to discharge the gas in the bag, and the other is to isolate the air outside the packaging bag. Next, we will introduce these two functions and how it works.


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Raw coffee beans contain acids, proteins, esters, carbohydrates, water, and caffeine. After being roasted at high temperatures, the raw coffee beans will produce carbon dioxide through a series of chemical reactions such as the Maillard reaction. Generally speaking, the carbon dioxide and other volatile gases released by roasted coffee beans account for 2% of the weight of the whole coffee beans. While 2% of the gas will be slowly released from the fiber structure of the beans, the release time will be related to the baking method. Because the coffee beans volatilize carbon dioxide, we will see that the roasted coffee beans are packed in a sealed bag, and they will bulge over time. This is the so-called "inflation bag". With the one-way exhaust valve, these inert gases can be removed from the bag in time, so that the coffee beans will not be oxidized by these gases, to maintain a good fresh state for the coffee beans.


Isolate air


How to isolate the air while exhausting? The one-way valve is different from the ordinary air valve. If an ordinary air valve is used, while discharging the gas in the packaging bag, it will also allow the air outside the packaging belt to flow into the bag, damaging the sealing of the packaging bag and making the coffee continue to oxidize. Oxidation of coffee beans will volatilize the aroma and deteriorate the ingredients. The one-way exhaust valve will not do this. It will discharge the carbon dioxide in the bag in time and will not allow the outside air to enter the bag. So how does it prevent outside air from entering the belt? Wo inlet valve tells you its working principle: when the air pressure in the bag reaches a certain threshold, the valve of the one-way exhaust valve opens to release the gas in the bag; Until the air pressure drops below the check valve threshold. The valve of the one-way valve is closed, and the packaging bag returns to the sealing state.


Therefore, we conclude that the unidirectionality of the coffee exhaust valve is the most basic and the most advanced requirement. The deeper the coffee beans are roasted, the stronger the exhaust effect is, and the faster the carbon dioxide will be released.


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