Flexible Laminate having an Integrated Pressure-Release Valve

Flexible multilayer laminate (1) for forming a packaging of gas-releasing products, said laminate having an integrated pressure-release valve (2) having open and closed orientations and having a liquid film (12) disposed therein, the liquid film (12) optionally comprising spacer means, said flexible multilayer laminate comprising:

• a laminate comprising a first oriented polymer layer (8) sealed on an underlying layer comprising a seal layer (6) by a first adhesive pattern (3) comprising first adhesive-free regions located on at least both sides of, or around at least one inlet perforation (11) and a second perforation-free oriented polymer layer (9) partly bonded to the first oriented polymer layer (8) via a second adhesive pattern (4), the first and second oriented polymer layers (8,9) forming, once bonded in register, an inflatable outlet tube (13), said inflatable tube (13) being partially disconnected from the rest of said laminate by a surrounding outer score line (15) allowing the tube (13) to lift off from the first laminate under increased pressure in the pack;
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• wherein the at least one inlet perforation (11) and the inflatable outlet tube (13) preferentially permit gaseous communication in one direction, the gas (14) entering through the at least one perforation (11), travelling through the liquid film (12) and exiting through the inflatable tube (13).