Sonoco Development Incorporated

Sabrina V Dixon-Garrett

Lawrence Robert Carpenter

Elizabeth Rhue

In an embodiment, the invention comprises a container comprising: a base; at least one sidewall extending upwardly from the base and terminating in a top edge, wherein the at least one sidewall is paper-based; a removable flexible membrane adhered to the top edge, wherein the membrane comprises a one-way valve; a liner ply at least partially adhered to an interior surface of the sidewall, wherein the liner ply is configured to at least partially release from the sidewall upon a pressure differential between the pressure within the container and the external pressure.

Container construction with flexible liner and one-way valve

A dual-ovenable container is formed from a blank of laminate material that includes a paperboard layer sandwiched between outer heat-sealable layers of amorphous polyester or heat-sealable cellophane. The blank is wrapped into a tubular or conical configuration and opposite edges of the blank form a lap joint at which the edges are heat-sealed together to form a container body. End closures can then be applied to the ends of the container body. The laminate is heat-sealable to itself, is able to withstand heating/cooking conditions in both conventional and microwave ovens, and has a low oxygen permeability. The edge of the blank exposed to contents of the container can be wrapped by a sideseam tape in order to protect the edge.

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Bennettsville, SC, United States of America

Sabrina V Dixon-Garrett