Patent ID: 7122234
Filing Date: 2006-10-17
Classification: B32B,B65D,Y10T

Abstract:
1. Transparent gas barrier packaging laminate having a bending stiffness for packaging of liquid foods and drinks by a high speed, continuous process, comprising: first and second outside layers of heat-sealable olefin polymer; heat-sealable olefin polymer; a first gas barrier coated carrier layer including a first gas barrier layer consisting of plasma enhanced chemical vapour deposited SiOx coated onto a first polymer carrier layer, where x is from 1.7 to 2.0; a second gas barrier coated carrier layer including a second gas barrier layer consisting of plasma enhanced chemical vapour deposited SiOx, coated onto a second polymer carrier layer, where x is from 1.7 to 2.0; and an intermediate polymer layer laminated between the first and second gas barrier coated carrier layers, the intermediate polymer layer having a higher thickness relative to each of the first and second gas barrier coated carrier layers, and a higher stiffness relative to low density polyethylene, wherein a stiffness of each of the first and second polymer carrier layers interacts with the stiffness and the higher thickness of the intermediate polymer layer by an I-beam or sandwich effect to provide the bending stiffness, wherein a thickness of the intermediate polymer layer is from 40 to 60 μm, a thickness of each of the first polymer carrier layer and the second polymer carrier layer is from 8 to 15 μm, thicknesses of the first and second outside layers of heat-sealable olefin polymer are from 10 to 25 μm, and from 18 to 30 μm, respectively, and a total thickness of the packaging laminate is from 110 to 140 μm.