Generally, you need to follow the following steps. The use of a coffee one-way valve is not complicated.
1. Before adding coffee beans, pinch the bag to squeeze out the air and oxygen.
2. Put the coffee beans into the bag, but do not swell the bag due to overfilling.
3. Add the bag to the exhaust machine and turn on the machine to squeeze out the air and oxygen.
4. After packaging, place the coffee beans in a cool, dry place.
