Method of making a packing laminate web
AssigneeTetra Pak International AB
InventorsRolf Viberg, Goran Harrysson, Tom Kjelgaard
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Abstract
The invention relates to a packing laminate web with a protective layer which is applied during the manufacture of the laminate web to one, sterile side of the web. When the laminate web is to be converted to aseptic packing containers the protective layer is detached and is transferred to the opposite side of the laminate web where it serves as an external plastic layer. The invention also comprises a method for the manufacture and conversion of the packing laminate web.
Claims7
A method for converting a packing laminate web to a secondary web with a sterile surface, comprising the steps of:
- extruding a detachable protective layer on to a first side of said packing laminate web to form the primary web, said protective layer maintaining said first side in a sterile condition;
- delaminating said protective layer from said first side while maintaining said first side in the sterile condition;
- and
- transferring said protective layer to a second side of said packing laminate, said protective layer being secured to said second side to form said secondary web;
- wherein, before the protective layer is delaminated, the laminate web is guided around a first of a pair of cooperating pressure rollers and then into a nip between said pressure rollers, where a transfer of the protective layer takes place, so that a laminate web in a secondary form is obtained after the web has passed between the pressure rollers for a second time.
A method for converting a packing laminate web to a secondary web having a sterile surface, comprising the steps of:
- forming a detachable protective layer onto a first side of said packing laminate web and covering the opposite side of said packing laminate web with an adhesive to form a primary web, said protective layer maintaining said first side in a sterile condition;
- dispensing said primary web over a first pressure roller of a pair of opposing pressure rollers, the adhesive covered side of the dispensed primary web facing the opposing pressure roller to define a nip therebetween;
- and
- further guiding said primary web to pass through said nip with the side of the guided primary web covered by the detachable protective layer bearing against the adhesive covered side of the dispensed primary web so that the protective layer from the guided primary web is transferred onto the dispensed primary web to thereby form a second web from the guided primary web.
Dependencies are inferred from the claim text.