Vacuum package with flexible end
AssigneeSonoco Products Company
InventorHerman Rupert Markert
Life of this patent
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Abstract
A vacuum package comprising a composite container of multi-ply paper and foil construction having the contents thereof retained in a vacuum environment, a container rigidifying end cap sealing one end thereof and a flexible tearable membrane sealing the other end with a plastic overcap at the membrane end, said membrane being inwardly flexed by atmospheric pressure against the container contents for a compaction thereof and a corresponding rigidification of the vacuum pack.
Claims5
An air impermeable vacuum package comprising a body having opposed ends, said body being of composite construction and having at least one air impermeable liner, an air impermeable end cap sealing one end of the body, an air impermeable force transmitting membrane sealed to the impermeable liner and sealing the other end of the body, said membrane being readily deformable relative to said body, a compactable product sealed within the body by the end cap and the membrane, a reduced pressure environment within the package sufficient to effect a pressure differential relative to external atmospheric pressure such that said membrane is inwardly deformed into force transmitting compacting engagement with the product, said product being compacted by said pressure deformed force transmitting membrane against the inner surfaces of the body and end cap and internally rigidifying and strengthening the package.
The package of claim 3 wherein said overcap has an air passing hole defined therethrough.
Dependencies are inferred from the claim text.