Patent ID: 6070728
Filing Date: 2000-06-06
Classification: B65D,Y10T

Abstract:
A package having an interior for holding a fine particulate material therein, said package having at least one wall panel, a degassing valve mounted on said wall panel, and a filter panel, said valve having an inner portion in communication with said interior of said packages an outer portion in communication with said exterior of said package and a movable element interposed between said inner portion and said outer portion and operative to enable gas within said package to vent to the ambient atmosphere outside said package, said package being formed of a flexible sheet material suitable for being hermetically sealed so that said fine particulate material is enclosed within said interior of said package, said filter panel being formed of a flat flexible sheet secured to at least one of said wall panels of said package over said interior portion of said valve to prevent said fine particulate material from entering said valve, said filter panel extending substantially beyond the periphery of the valve to provide a large surface area to facilitate the flow of gas out of the package through said valve.