Sätt att framställa ett laminerat material innefattande skikt av aluminium och plast

摘要

A method of producing a laminate material (1) for example a packaging laminate comprising mutually bonded layers of plastic and aluminium (4 and 2, respectively) with good internal adhesive bonding strength, in which method molten plastic (4) is extruded onto and caused to harden on the aluminium web (2). For the purposes of improving the adhesion between the aluminium web (2) and the extruded plastic, the aluminium web (2) is brought into contact with hot aqueous medium (3) for the formation of surface layers of false boehmite on the aluminium web (2) prior to the contact of the aluminium web (2) with the molten plastic (4). The aqueous medium (3) consists of water which is kept at a temperature of between approximetely 90 and 120 DEG C, but may also be hot water vapour which is sprayed onto the aluminium web.