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US 2008/0187851 A1Published application
Method of Marking Material, Marked and Verification of Genuineness of a Product
AssigneeStora Enso OYJ
InventorMinna Kurittu
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AssigneeStora Enso OYJ
InventorMinna Kurittu
Estimating the term…
The invention relates to the marking of a material (18) with identifier marks (16), the material thus marked, and verification of the genuineness of a product on the basis of the marks. In accordance with the invention, an optical brightener is incorporated in the material (18), and marking is performed by reducing the brightness of the material at a selected location by directing local heating to this location, the mark (16) thus produced appearing with a darker shade than its environment in ultraviolet light (20). The marking is based on partial or complete destruction of the brightening effect of the optical brightener under heating. The invention is suitable for providing e.g. coated paper and board containing an optical brightener with identifier marks for preventing falsifications.
A method for marking a material, characterised in that an optical brightener is incorporated in the material (18) and in that marking is performed by reducing the brightness of the material at a selected location by directing local heating to this location, the mark (16) thus produced appearing with a darker shade than its environment in ultraviolet light (20).
A method as defined in any of the preceding claims, characterised in that a layered material (18) is marked during its manufacture by making marks (16) in a material layer (3) containing an optical brightener and by applying a second material layer (12) on top of this layer, with the marks remaining within the layer structure produced.
A method for verifying the genuineness of a product, characterised in incorporating in the product (18) a material (3), in which an optical brightener has been dispersed and which has been marked by reducing its brightness at a selected location (16) by directing local heating to this location, and in placing the product in ultraviolet light (20) in order to expose the identifier mark (16).
Dependencies are inferred from the claim text.