Patent ID: 6983857

Claim:
A venting liner for a cap and container assembly comprising: a liner impermeable to a liquid and selectively permeable to a gas, in a form adapted to be positioned over a container opening, being defined by at least three layers, a first layer, an intermediate layer and a third layer, said layers including at least one perforation extending vertically through said first, intermediate and third layers to provide controlled, unimpeded gas flow through said liner at a desired pressure level; said first layer having an outer surface facing away from said container opening and an inner surface facing toward the container opening, with the at least one perforation being open to ambient conditions outside the outer surface, said intermediate layer consisting of a resilient foam material positioned between said first layer and said third layer and responsive to a pressure in said container such that, in a pressurized state, said intermediate layer is adapted to expand and compress facilitating the passage or prevention of gas flow through the at least one perforations depending on said pressure conditions; said third layer having a first surface adjacent to said intermediate layer and a second surface adjacent to the container opening, with the at least one perforation being open to ambient conditions inside of the second surface; wherein said liner controls the pressure level in said container such that when the pressure inside of said container is at a selected pressure level, said venting liner allows gas flow through the perforation, thereby releasing gas flow from said container, and when the pressure inside of said container is at a desired level, said venting liner seals the container, thereby resisting gas flow from said container.