Patent ID: 6383582
Filing Date: 2002-05-07
Classification: B32B,Y10T

Abstract:
A laminated packaging material especially for heat-sealable liquid food packages, comprising a core of paper or cardboard and oxygen and aroma proof barrier layers consisting of ethylene-vinyl alcohol copolymer and polyamide layers, wherein the weight of the polyamide layer is in the range of 1 to 8 g/m2, and wherein the weight of the ethylene-vinyl alcohol copolymer layer is in the range of 1 to 8 g/m2; that the layer of ethylene-vinyl alcohol copolymer and the layer of polyamide are joined together without an intermediate adhesive layer, and that the material includes polymeric heat-sealing layers on both sides so that the core and the said barrier layers are situated between the heat-sealing layers; wherein the barrier layers joined together are placed directly against the core of paper or cardboard without an intermediate adhesive layer; wherein there is an adhesive layer having a weight in the range of 3 to 10 g/m2 which is between an outer heat-sealing layer and a barrier layer; and wherein the laminated packaging material has an oxygen penetration of no more than 2.6 cm3/m2/24 hr.