The holes on the coffee bag are mainly one-way exhaust valves, which have the
following functions:
Prevent gas explosion in packaging bags: roasted coffee beans will release a
large amount of carbon dioxide, and a one-way exhaust valve can expel excess gas
from the bag to prevent the packaging bag from being burst.
Keep coffee beans fresh: The one-way exhaust valve can block the air outside
the bag from entering the bag, avoiding oxidation of coffee beans due to contact
with oxygen, thereby maintaining their freshness and flavor.
Eliminating stale odor: By adding this small hole to the packaging, the gas
can circulate in the packaging, taking away the stale odor, making the taste of
the beans more pure and mellow.
Please note that this small hole is not used to smell the aroma of coffee
beans, although sometimes it can be used to smell some odors, it is not its main
function.
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