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Have you ever carefully observed the packaging bag of coffee beans? The structure of the coffee packaging bag is very special. Have you noticed that there are several "small holes" in the back of the coffee bag?On the back of the coffee packaging bag, we often see a round raised air valve with a cir
Coffee is very common in life. When buying coffee, you may notice a round valve on the coffee bag and wonder what they are used for. Coffee beans keep giving out large quantities of carbon dioxide for many hours after they have been roasted. Due to this off-gassing process, coffee beans and powder
