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1. (WO1998051437) A METHOD OF PRODUCING A PRINTING INK-DECORATED PACKAGING MATERIAL, IN PARTICULAR FOR ASEPTIC PACKAGES
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WHAT IS CLAIMED IS:

1. A method of producing a printing ink-decorated packaging material (10) of laminate type, comprising an outer coating (13) of plastic which serves as decor carrier and which has, on its outside, applied decor (16) of water-based printing ink, in which method a web of rigid, but foldable paper (10') which, at least on its one side, has an outer coating (13) of plastic, is subjected, for the purpose of promoting adhesion, to a surface treatment modifying its polarity, by means of electric corona discharges, and in which method the thus surface-treated outer plastic coating (13) of the web is thereafter provided with decor of water-based printing ink which, using conventional printing technique, is applied in any optional pattern on the outside of the surface-treated plastic coating, characterized in that the web, after said printing ink application, is subjected to a surface energy-reducing after treatment (21).

2. The method as claimed in Claim 1, characterized in that the outer plastic coating (13) of the paper web consists of low density polyethylene (LDPE).

3. The method as claimed in Claim 1 or 2, characterized in that the decor-provided outer plastic coating (13) is heated in connection with the energy-reducing after treatment

4. The method as claimed in Claim 3, characterized in that the decor-provided outer plastic coating (13) is heated by means of hot press rollers or press cylinders (22, 23) between which the web is led.

5. A method of producing a printing ink-decorated packaging material (10) of laminate type for aseptic packages, which are produced from a web of the packaging material which, for the purpose of sterilization, is led through a bath of aqueous hydrogen peroxide prior to the reforming of the web into finished aseptic packages, in which method a web (10 ) of rigid, but foldable paper which, at least on its one side, has an outer coating (13) of plastic serving as decor carrier and which, on its other side, has a material layer (14) applied as gas barrier, is subjected, for the purpose of promoting adhesion, to a surface treatment modifying its polarity, by means of electric corona discharges, and in which method the thus surface-treated outer coating (13) of plastic of the web is provided with optional decor (16) of water-based printing ink which, using conventional printing technique, is applied in the desired pattern on the outside of the surface-treated outer plastic coating, characterized in that the web, after said printing ink application, is subjected to a surface energy-reducing after treatment (21).

6. The method as claimed in Claim 5, characterized in that said outer plastic coating (13) of the paper web consists of low density polyethylene

(LDPE).

7. The method as claimed in Claim 5 or 6, characterized in that the decor-provided outer plastic coating (13) of the web is heated in connection with the surface energy-reducing after treatment.

8. The method as claimed in Claim 7, characterized in that the decor-provided outer plastic coating (13) of the web is heated by means of hot press rollers or press cylinders (22, 23) between which the web is led.

9. A packaging container, characterized in that it is produced from a packaging material (10) of laminate type produced by the method as claimed in any of Claims 1 to 4.

10. An aseptic packaging container, characterized in that it is produced from a packaging material (10) of laminate type produced by the method as claimed in any of Claims 5 to 8.