Light-weight, flexible, easy-open, impermeable package system

Claim 1

A light-weight, flexible, easy-open, impermeable package containing water or air sensitive materials, said package being produced from a porefree metal foil sheet, said sheet having a heat resistant package-supporting plastic film on the outer surface thereof; said sheet being folded upon itself along a median line with the heat resistant film located exteriorly to provide top and bottom wall portions; relatively narrow and continuous peripheral opposed bands of solder on the inner surface of each of said top and bottom wall portions, said opposed bands being located in overlying mating relationship and being spaced inwardly from the peripheral edges of said top and bottom wall portions; thermoplastic film coatings on said facing top and bottom wall portions in a pattern of two concentric rectangles on each of said facing top and bottom wall portions corresponding to areas interiorly and exteriorly of said peripheral bands of solder; said two concentric rectangles on each of said portions being in overlying mating relationship; said opposed bands of solder being sealed to each other providing a complete metal seal through the top and bottom foil sheets; and said thermoplatstic coatings being sealed to each other providing a thermoplastic peripheral seal through said top and bottom wall portions on each side of said solder bands seal providing an interior open area between said top and bottom wall portions for the reception of the material being packaged, said interior open area being surrounded by a plurality of concentric hermetic seals including a peripheral thermoplastic seal, an intermediate solder seal, and an inner thermoplastic seal.