Why Do Coffee Bags Have a Valve

For the coffee bag, do you know what the little valve in the bag use for? Does the coffee valve must need on the coffee bag?

What the valve does, release essential air molecules from the bag to help preserve the life expectation of the beans inside. The degassing valve helps the coffee package maintain its shape by allowing gases to escape. Gases are emitted after roasting and continue to emit even after the coffee is packaged. If the gases are trapped inside the package, this can cause the bag or pouch to inflate or bloat.

When green coffee beans are roasted, they begin the process of releasing carbon dioxide. The fresher the roast, the more carbon dioxide is released from the bean. Sealing fresh beans inside an unventilated bag would result in the bag expanding, and eventually, the bag would rupture.

This process is known as 'oxidisation', and essentially, the more oxygen coffee beans are exposed to, the less fresh the coffee. It's why airtight coffee bags often come with resealable zip-lock pouches, and it's why the valve on the bags don't let oxygen in, they only let carbon dioxide out.

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