Processes of forming laminated blade metal / substrate standardized and container for packaging food referred to laminate and container and label of electronic surveillance

摘要

A method for making a patterned metal foil/substrate laminate (10) by laminating a sheet of metal foil (14) to a substrate (12) 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 (10) is intended for microwave packaging applications, the laminate further includes a sheet of barrier layer material, preferably polymer film (16), 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.