Integrated One-Way Valve with Polyol Film
AssigneeSonoco Development, Inc.
InventorJacob Donald Prue Branyon
Life of this patent
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Abstract
A one-way valve integrated into a lamination of the kind used as a membrane seal for coffee containers and the like. The valve comprises a top layer, a substrate and a fluid polyol film. The top layer and the substrate are adhered together by an adhesive disposed between the top layer and the substrate. The adhesive defines a boundary of a valve chamber in which the top layer and the substrate are not permanently adhered to each other. The film enhances the adhesiveness of the top layer to the substrate in the area of the valve chamber so that gas inside the container does not escape until the internal pressure reaches a minimum value.
Claims16
A one-way valve for use with a container, the valve comprising:
- a laminate comprising a substrate and a top layer, the substrate defining one or more inlet openings, the top layer defining one or more outlet openings;
- an adhesive disposed between the top layer and the substrate and adhering the top layer to the substrate, the adhesive defining a boundary of a valve chamber in which the top layer and the substrate are not permanently adhered to each other, wherein the one or more inlet openings fluidly connect an interior of the container to the valve chamber and the one or more outlet openings fluidly connect the valve chamber to an exterior surrounding the container;
- and
- a fluid film occupying at least a portion of the valve chamber and adhering the top layer to the substrate within the valve chamber when a pressure differential between an internal pressure of the container and an ambient air pressure is less than a minimum gas release pressure differential;
- wherein
- the fluid film does not comprise a silicon oil or glycerin.
Dependencies are inferred from the claim text.