Patent ID: 6893529

Claim:
A method of producing a laminate material suitable for use in packaging material, comprising: providing a pre-manufactured first web comprising a layer of polyethylene extruded at a temperature Te above a breakpoint temperature which is higher than a normal melting temperature Tm of the extruded polyethylene, said layer of polyethylene having an outer surface; providing a second web comprising a layer of PET or OPET, said PET or OPET having an outer surface; subjecting the first web and the second web to a non-chemical surface activation treatment in a continuous process; and contacting the outer surface of the polyethylene layer of the first web with the outer surface of the PET or OPET layer of the second web and permanently uniting the first and second webs which have been subjected to the surface activation treatment with one another by simultaneous application of heat and pressure, wherein the webs are united with one another and together led through a nip between pairs of rotating rollers of mutually different surface hardnesses, a relatively softer roller in each respective pair being pressed against a relatively harder roller.