Why should coffee beans be sealed and preserved？

Coffee beans are hygroscopic

When coffee beans are exposed to sunlight, they will undergo chemical changes, the moisture will evaporate, and they will begin to deteriorate. The higher the temperature, the faster the deterioration. Some people suggest refrigerating or freezing the coffee beans. However, the coffee beans themselves can easily absorb the external taste and moisture, so if you do not use a sealed coffee bag that can block the outside air, the coffee beans will have peculiar smell.

If you put the coffee bag in the refrigerator, if the coffee beans that have been opened are stored in the refrigerator, due to its inherent "hygroscopicity", it will not only absorb the peculiar smell near the refrigerator, make the aroma of coffee beans disappear, but also because of repeated changes from the refrigerator. 【Coffee packaging bag】Bringing in and out of the refrigerator causes tiny water droplets to adhere to the coffee beans and a significant increase in humidity, which in turn encourages the growth of mold.