| 摘要 |
The disclosure relates to a method of producing packaging material comprising a core layer (9) which is provided with punched holes, apertures or slits (14), and which displays, along its one side, an unbroken layer (7) of a laminate consisting of aluminium foil and polyethylene. On production of the packaging material, a "primary laminate" (7) of polyethylene and aluminium foil is first created in that the polyethylene is extruded as a film between the aluminium foil and the surface of a cooling roller while, in a second operation, which is carried out on the same cooling roller, a web (9) of paper or board provided with holes, apertures or slits (14) is united with the above-mentioned primary laminate (7) by the intermediary of an extruded polyethylene layer (16). <IMAGE> |
