Why do coffee packaging bags need breathable valves?

●  The Importance of Freshness in Coffee

During the roasting process, coffee beans release a large amount of aroma and oil. Over time, these aromas and oils will gradually evaporate, leading to a decline in the quality of coffee beans. Therefore, maintaining the freshness of coffee beans is crucial. Freshly brewed coffee beans have a rich and aromatic taste, while aged coffee beans have a plain taste and completely lose their aroma.

●  The function of breathable valve

○  Emissions of carbon dioxide: Coffee beans produce a large amount of carbon dioxide during the roasting process, which is continuously released during storage. If the packaging bag does not have good breathability, carbon dioxide will accumulate inside the bag, causing it to expand or even burst, affecting the storage safety of coffee beans. The breathable valve allows these carbon dioxide to be smoothly discharged, thereby avoiding pressure on the packaging bag and ensuring storage stability.

○  Oxygen barrier: Unlike simple exhaust, the design of breathable valves often has unidirectionality, allowing only gas to be discharged from the bag to the outside while preventing external oxygen from entering the bag. Oxygen is one of the main causes of coffee bean oxidation. Once a large amount of oxygen enters the bag, it accelerates the oxidation process of coffee beans, leading to flavor deterioration. Therefore, the function of the breathable valve is crucial for maintaining the freshness and quality of coffee beans.

○  Maintain air pressure balance: During the storage and transportation of coffee beans, changes in ambient temperature may cause expansion or contraction of the gas volume inside the bag. The presence of breathable valves can adjust the air pressure inside and outside the bag in a timely manner, avoiding deformation or damage of the packaging bag due to changes in air pressure, and maintaining the normal shape of the bag body.

○  Moisture and odor prevention: Although breathable valves allow gas exchange, their design usually effectively blocks the intrusion of external moisture and odors. This is crucial for maintaining the dryness and pure flavor of coffee beans.

●  How to choose coffee packaging bags with breathable valves

○  Observe the appearance of the breathable valve and choose high-quality products that are smooth, free of burrs, and odorless.

○  Check the sealing performance of the breathable valve to ensure that it will not leak during transportation.

○  Understand the material of breathable valves and choose high-quality materials that meet food safety standards.

○  Pay attention to the design of the breathable valve, which should be easy to open and close, and convenient to use.