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US 5,800,724 AGranted
Patterned metal foil laminate and method for making same
AssigneeFort James Corporation
InventorsCharles C. Habeger, Kenneth A. Pollart
Life of this patent
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AssigneeFort James Corporation
InventorsCharles C. Habeger, Kenneth A. Pollart
Estimating the term…
A method for making a patterned metal foil/substrate laminate by laminating a sheet of metal foil to a substrate by applying an adhesive between the metal foil and substrate and irradiating the metal foil with a laser beam in a predetermined pattern to vaporize the irradiated portions of the metal foil. Particularly where the laminate is intended for microwave packaging applications, the laminate further includes a sheet of barrier layer material, preferably polymer film, laminated to the patterned metal foil layer. The polymer film layer-containing laminate can be formed into a container for packaging food intended for heating in a microwave oven. A particularly effective pattern comprises a plurality of metal foil islands electrically separated by dielectric substrate gaps. Preferably, the metal foil is aluminum foil, desirably unannealed aluminum foil, and the substrate is selected from paper and coated or uncoated paperboard. The patterned metal foil/substrate laminate is also useful for electrical circuitry, particularly, for example, as the resonant circuit in electronic surveillance tags.
A method of forming a patterned metal foil/substrate laminate comprising the steps of:
A method of forming a container for packaging food intended for heating in a microwave oven, the container having at least one section that is opaque to microwave energy for shielding food adjacent to the opaque section, and at least one section that is substantially transparent to microwave energy, said method comprising the steps of:
A patterned metal foil/substrate laminate wherein said pattern is formed by laminating a sheet of metal foil to a substrate by applying an adhesive between said metal foil and said substrate and irradiating said metal foil with a laser beam in a pattern for removing by vaporization the irradiated areas of the metal foil.
A container for packaging food intended for heating in a microwave oven, said container having at least one section that is opaque to microwave energy for shielding food adjacent to the opaque section, and at least one section that is substantially transparent to microwave energy, said container formed from a barrier layer/patterned metal foil/substrate laminate with said barrier layer adjacent to the food in the container, wherein said barrier layer/patterned metal foil/substrate laminate is formed by laminating a sheet of metal foil to a substrate by applying an adhesive between said metal foil and said substrate, irradiating said metal foil with a laser beam in a pattern for removing by vaporization the irradiated areas of the metal foil and laminating a sheet of barrier layer material to the patterned metal foil layer, whereby the areas of the laminate from which metal foil was removed form the sections of the container that are substantially transparent to microwave energy and the foil-containing areas of the laminate form the sections of the container that are opaque to microwave radiation.
An electronic surveillance tag for merchandise for initiating an alarm in the event tagged merchandise is removed from a merchandise establishment, said tag comprising a resonant circuit tuned to a given radio frequency for producing a detectable resonant condition for triggering an anti-shoplifting alarm, said resonant circuit formed from a patterned metal foil/substrate laminate, wherein said patterned metal foil/substrate laminate is formed by laminating a sheet of metal foil to a substrate by applying an adhesive between said metal foil and said substrate and irradiating said metal foil with a laser beam in a pattern for removing by vaporization the irradiated areas of the metal foil, whereby unirradiated areas of the laminate formed of metal foil comprise conductive circuit elements for forming the resonant circuit.
Dependencies are inferred from the claim text.