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US 12,091,232 B2Granted
Retortable self-heating food container with air access structure
AssigneeSonoco Development, Inc.
InventorScott William Huffer
Life of this patent
Estimating the term…
Abstract
A flexible, self-heating food container capable of withstanding high temperatures is provided. The container comprises a two-layer laminate structure having an air access flap that can be lifted by the consumer to allow air to enter the part of the container where an exothermic reaction takes place.
Claims20
A method of making a flexible self-heating package comprising the steps of:
- coextruding a substrate and a frangible skin layer to create a bottom layer;
- providing a top layer of flexible material in sheet form;
- joining the bottom layer to the top layer with a permanent adhesive;
- scoring a plurality of undercuts in the bottom layer;
- scoring an overcut in the top layer that substantially surrounds the undercuts and defines a flap to create a scored laminate film, wherein each of the plurality of undercuts defines a die cut section in the bottom layer that separates from the bottom layer when the flap is separated from the bottom layer to form an air hole in the bottom layer;
- and
- forming a flexible-self-heating package with the scored laminate film.
4 more elements
A method of making a flexible self-heating package comprising the steps of:
- coextruding a substrate and a frangible skin layer to create a bottom layer;
- providing a top layer of flexible material in sheet form;
- joining the bottom layer to the top layer with a permanent adhesive, wherein the frangible skin layer is in direct contact with the permanent adhesive;
- scoring a plurality of undercuts in the bottom layer;
- scoring an overcut in the top layer that substantially surrounds the undercuts and defines a flap to create a scored laminate film, wherein each of the plurality of undercuts defines a die cut section in the bottom layer that separates from the bottom layer when the flap is separated from the bottom layer to form an air hole in the bottom layer;
- and
- forming a flexible-self-heating package with the scored laminate film.
4 more elements
A method of making a flexible self-heating package comprising the steps of:
- coextruding a substrate and a frangible skin layer to create a bottom layer;
- providing a top layer of flexible material in sheet form;
- joining the bottom layer to the top layer with a permanent adhesive;
- scoring a plurality of undercuts in the substrate;
- scoring an overcut in the top layer that substantially surrounds the undercuts and defines a flap to create a scored laminate film, wherein each of the plurality of undercuts defines a die cut section in the bottom layer that separates from the bottom layer when the flap is separated from the bottom layer to form an air hole in the bottom layer, and
- forming a flexible-self-heating package with the scored laminate film.
3 more elements
Dependencies are inferred from the claim text.