Abstract: A method for atmosphere modification in a container during the sealing process that includes deploying a closure head on the container so as to enclose at least the container-opening and create an air-tight seal such that an interior volume of the closure head is isolated from the ambient atmosphere. The closure head having at least one conduit providing fluid communication between the interior volume and at least one of a vacuum source and a pressure source. The method also includes creating at least a partial vacuum inside the container, inserting a replacement atmosphere into the container by means of the pressure source, sealing the container; and removing the closure head from the container. Devices for implementing this method are also disclosed.

Abstract: A sheet material for use in packaging having at least a first layer and at lease a second layer, wherein the first layer and the second layer are bonded together to fabricate the sheet material such that an area between the first layer and the second layer is unbonded so as to create a passageway having at least one opening on a first side of the sheet material and at least one opening on a second side of the sheet material, the passageway being a one-way valve integrally formed by bonding together the first and second layers to form the sheet material.

Abstract: A method for atmosphere modification in a container during the sealing process that includes deploying a closure head on the container so as to enclose at least the container-opening and create an air-tight seal such that an interior volume of the closure head is isolated from the ambient atmosphere. The closure head having at least one conduit providing fluid communication between the interior volume and at least one of a vacuum source and a pressure source. The method also includes creating at least a partial vacuum inside the container, inserting a replacement atmosphere into the container by means of the pressure source, sealing the container, and removing the closure head from the container. Devices for implementing this method are also disclosed.