Patent ID: 7135088
Filing Date: 2006-11-14
Classification: B32B,Y10T

Abstract:
1. A method for producing a packaging material web comprising: conveying a thermoplastic layer toward a nip between a first pair of rollers, the first pair of rollers comprising first and second rollers, with the first roller being heated; conveying a metal foil towards the nip between the first pair of rollers; passing the thermoplastic layer and the metal foil concurrently through the nip between the first pair of rollers to compress the thermoplastic layer and the metal foil together while applying heat sufficient to adhere the thermoplastic layer to the metal foil to produce a united laminate web; conveying the united laminate web toward a nip between a second pair of rollers; conveying a core web of paper or cardboard provided with at least one through hole toward the nip between the second pair of rollers; extruding a thermoplastic adhesive between the united laminate web and the core web; and passing the united laminate web and the core web through the nip between the second pair of rollers with the thermoplastic adhesive between the core web and the united laminate web to join together the united laminate web and the core web and produce a packaging material web in which the at least one through hole in the core web is covered by the united laminate web and the metal foil of the united laminate web faces a first side of the core web.