The roasting process causes the coffee beans to release carbon dioxide for several days after roasting.
The one-way valve coffee bag enables the Coffee Roaster to pack the coffee beans immediately after roasting.
The coffee beans can degas inside the bag because the one-way valve lets the carbon dioxide escape without letting air and moisture in.
On the other hand, the coffee beans degas before being packed in vacuum sealed coffee bags. This means that for a few days the coffee beans are exposed to their worst enemies: air, light, heat and moisture.
Vacuum-packaging is used by coffee suppliers who sell long shelf- life coffee. The ‘brick’ look coffee packs are easily stackable to be transported globally and stored for many months.
Contrary to common belief, fresh is not synonym with vacuum packed coffee bags.
The quality of the coffee bag is also important. Thin paper bags, clear plastic bags and window coffee bags will shorten the shelf life of your coffee beans.
For freshly roasted and packed coffee beans, look for thick lined coffee bags with a button-like one-way valve at the top of bag.