Pack for liquids spoilable by outside influence has valve letting liquid out but preventing entry e.g. of oxygen from outside

摘要

The pack for a liquid such as milk includes a valve inside the pack, which also contains a foil bag connected to a funnel of the valve. The foil bag is filled and connected to the valve itself. The funnel is connected to a tear-off cap, or possibly a clip-type closure. Once the protective cap has been removed, light pressure on the pack will cause the liquid to come out.