Pressure vacuum release hermetic valve for flexible packages

Details Pressure vacuum release hermetic valve for flexible packages Pressure vacuum release hermetic valve for flexible packages

B - Operations, Transporting

65

D

B65D 30/24 (2006.01) B65D 77/22 (2006.01)

Patent

CA 2233989

A flexible, gussetted package having an interior for holding some particulate material product, under vacuum, and which includes a mouth to be opened to provide access to the contents of the package. The package is formed of a flexible material and includes a front panel, a rear panel, and a pair of opposed side gussets and a pressure equalizing valve. The valve is arranged to operate in a first mode of operation wherein any gasses within the package are allowed to vent to the exterior of the package, while the ambient atmosphere is precluded from entering into the interior of the package. The valve also operates in a second, transitory, mode wherein it allows a small amount of the ambient atmosphere to gain ingress into the interior so that the package's walls give a smooth appearance. The valve then enters into its third mode of operation wherein it isolates the interior of the package from the exterior.

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