Patent ID: 7767051

Claim:
Method in connection with the continuous joining of a first layer of aluminum and a second layer of a different material, to produce a packaging laminate comprising said first and second layers, the method comprising: subjecting a free surface of at least said first layer of aluminum to both plasma treatment and flame treatment; joining together said free surface of the first layer of aluminum with a free surface of the second layer after the flame treatment and the plasma treatment; joining the first layer, before the flame treatment and the plasma treatment, with a bulk layer of paper or paperboard, on a side of the first layer opposite to the free surface of the first layer, the bulk layer exhibiting though holes, openings or slits covered by a membrane comprising the first layer of aluminum; the plasma treatment being performed locally, only at regions of the through holes, openings or slits, the plasma treatment being performed intermittently on a continuously running web comprising the first layer.