These envelopes, in addition to their multi-layered design, which provides protection for the contents inside—ranging from liquids and beverages to various powders and foods—against factors of spoilage and degradation, also feature a valve that allows for the release of gases emitted by the product inside. This prevents the envelope from bursting or inflating.
Most coffees, whether ground or whole beans, release gas during packaging.
At Gamma Pack Packaging Industries, different types of valves are used for multi-layer envelopes, specifically for ground coffee and whole coffee beans. An important point is that the gas release is one-way, from the inside of the envelope to the outside. Another important point is that many chemicals and synthetic materials also release gases, and only such envelopes are capable of preserving and storing them properly.
