Patent ID: 6964797

Claim:
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/m 2 , and wherein the weight of the ethylene-vinyl alcohol copolymer layer is in the range of 1 to 8 g/m 2 ; 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 the barrier layers do not contain an aluminum layer; and wherein the barrier layer of ethylene-vinyl alcohol copolymer layer is placed directly against the core of paper or cardboard; and the material further comprises an adhesive layer having a weight in the range of 3 to 10 g/m 2 which is between one of said outer heat-sealing layers and one of said barrier layers.