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Why do packaged coffee bean bags have exhaust holes?

2022-12-16

During the roasting process of coffee raw beans, the water contained in the interior will gradually dispersal due to the temperature of the baking boiler, and these original water -containing spaces will also produce a compressed state due to dehydration.

Once the coffee beans leave the beans, the space for dehydration and compression inside will gradually recover due to temperature difference and water in the atmosphere. In order to prevent the just -roasted coffee beans excessively absorbing the water in the air, it is usually packed in a Packaging Bag to save.

Beans will continue to exhaust in the bag. After a period of time, it will be filled with the entire packaging bag. At this time, if there is no passage of the gas and continuously expand, the gas will cause pressure, so that coffee cooked beans cannot continue to exhaust.

Once in such a state, the fiber space inside the coffee beans will be compressed and cannot be restored to the original size, which makes the water absorption saturation worse during the brewing process, and the extracted coffee liquid taste is not rich enough. If there is an exhaust channel for saving coffee beans, the above problems can be avoided. This exhaust channel is only drained out of the gas one by one, rather than the two -way ventilation that causes moisture to enter the packaging bag.

Sometimes we will see that the bag is bulging due to exhaust, and do not squeeze at this time; because external force is squeezed to release the gas, the pressure in the bag will weaken rapidly, resulting in imbalance in the inside and outside of the bag, making coffee beans, making coffee beans. Internal fiber space becomes smaller due to pressure compression, which affects the quality of brewing extraction.
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