Method and apparatus for preparing fold lines
AssigneeSIG Technology AG
InventorsWerner Seiche, Toma Schneider, Jörg Berger
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Abstract
The method and the apparatus are used for preparing fold lines on laminated materials on the basis of cardboard. At least one region intended for providing the fold line is subjected to heat such that an at least partial local reduction of shear fracture stresses of the material is produced in said region. The application of heat is done using a heating device, which is disposed adjacent to a guide device for the laminate. The local reduction of the shear fracture stresses supports local delamination, which supports the formation of a folding joint.
Claims11
A method for preparing fold lines in laminated materials based on cardboard for producing containers for foodstuff, the laminated materials having an inner layer and an outer layer, wherein the inner layer is formed from at least two plies, the method comprising the step of thermally treating at least one area intended for preparation of a fold line for producing a corner region of the container so that shear fracture stresses of the material are at least partially decreased locally in this area, as a result of which local delamination in this area is supported, wherein, as a result of delamination in the corner region an inner ply of the inner layer of the laminate is partially separated from a neighboring ply of the inner layer in an outer direction of the laminate so that the inner ply of the inner layer extends away from the neighboring ply in the corner region so as to form a hollow space between the inner ply and the neighboring ply.
Dependencies are inferred from the claim text.