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US 5,207,632 AGranted
Method of obtaining bend lines on packaging material
AssigneeTetra Alfa Holdings S.A.
InventorJohn-Erik Brunlid
Life of this patent
Estimating the term…
Abstract
Bend lines on packaging material are obtained by creasing, which results in crease lines which are raised on one side of the material. According to the invention the raised parts of the crease lines are removed by mechanical processing, such as by milling, considerably increasing the crease lines' weakening effect on the packaging material and facilitating subsequent bending of the material.
Claims17
A method of achieving crease lines on packaging material comprising the steps of:
- passing the material between a pair of forming rollers to form a desired pattern of raised parts on a first side of the material:
- moving the material on which the raised parts are formed from contact with both of the rollers forming the pair;
- and
- subsequently processing the material on which the raised parts are formed to at least partially remove that portion of the material forming the raised parts.
1 more element
A method of forming crease lines in packaging material comprising the steps of:
- pressing a sheet of packaging material with pressing means along a predetermined line to form a depression on a first side of the material and a raised part along said line on a second side of the material, moving the sheet of packaging material from contact with the pressing means, and subsequently removing that part of the material forming said raised part to form a flat surface on said second side.
A method of forming folds in packaging material comprising the steps of:
- pressing a sheet of packaging material with pressing means along a line to form a depression on a first side of the material and a raised part along said line on a second side of the material;
- moving the material from contact with the pressing means;
- subsequently reducing the thickness of the material on a second side of the material by removing material on the second side of the material over a width of the material extending from an edge of the material to a distance from the edge of the material;
- and
- folding the reduced thickness material in half such that the depression forms an outside corner of a fold.
2 more elements
Dependencies are inferred from the claim text.