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1. WO2020107066 - A SECURITY FEATURE AND A METHOD OF MANUFACTURE THEREOF

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1 . A security feature comprising:

a substrate including a first surface and a second surface,

a first image layer applied to the first surface of the substrate, by depositing a coloured ink in selected regions of the substrate in accordance with a first image, a second image layer applied to the substrate, wherein the second image layer is a layer of semi-opaque material including transparent or translucent regions in which the semi-opaque material is omitted or reduced, at least some of the transparent or translucent regions overlap with the first image,

wherein the first and the second image layer collectively define a coloured multi-tonal image that is visible both in transmission and reflection.

2. A security feature according to claim 1 , wherein coloured ink is deposited on less than 50% surface area of the substrate, or less than 30%, or less than 20%.

3. A security feature according to either claim 1 or 2, wherein the first and the second image layers are provided on opposing first and second surfaces of the substrate, or on the same surface of the substrate.

4. A security feature according to any one of claims 1 to 3, wherein the transparent or translucent regions of the second image layer are arranged in accordance with one or more tonal values of the multi-tonal image.

5. A security feature according to any one of claims 1 to 4, wherein the transparent or translucent regions of the second image layer correspond to darker tone(s) of the multi-tonal image.

6. A security feature according to any one of claims 1 to 5, wherein the first image layer defines a mono-tonal version of the multi-tonal image, and the second image layer provides tonal variations for the mono-tonal image.

7. A security feature according to any one of claims 1 to 5, wherein the first image layer comprises a tonal variation in itself.

8. A security feature according to any one of claims 1 to 6, wherein the first and the second image layers are both printed using a gravure printing unit in an in line printing process.

9. A security feature according to any one of claims 1 to 8, wherein one or more additional layers of opacifying material are applied to the first and/or the second surface of the substrate.

10. A security feature according to claim 9, wherein the one or more additional layers of opacifying material are applied such that the first image layer is sandwiched between two misregistered half-windows, the two misregistered half windows creating a region of reduced opacity in the substrate.

1 1 . A security feature according to claims 9 or 10, wherein the one or more additional layers of opacifying material are applied such that the first image layer is sandwiched between four misregistered half-windows, two on each side of the substrate, the four misregistered half-windows creating a region of reduced opacity in the substrate.

12. A security feature according to claim 10 or 1 1 , wherein a different coloured multi-tonal effect is observed from each side of the substrate.

13. A security feature according to any one of claims 1 to 9, wherein the multi-tonal image is visible as a coloured mono-tonal image (free of visually perceivable tonal variation) from the second surface of the substrate.

14. A security feature comprising a single printed working applied to a substrate, wherein the single printed working displays a multi-tonal image visible both in reflection and transmission, and the multi-tonal image appears substantially similar from either side of the substrate.

15. A security feature according to claim 14, wherein the single printed working is applied by a gravure printing unit.

16. A security feature according to either claim 14 or 15, wherein tonal variations in the image are created by half toning, and/or modulating ink cells of a gravure cylinder.

17. A security feature according to any one of claims 14 to 16, wherein the multi- tonal image is formed in a window or a half-window region of the substrate.

18. A security feature comprising:

a substrate including a first surface and a second surface,

a first and a second printed working applied to the substrate,

wherein the first and the second printed working at least partially overlap and are registered to one another, the first printed working is multi-tonal and the second printed working is substantially free of tonal variation, the first and the second printed working are each formed in a single printed layer and in contrasting colours, the first and the second printed working collectively provide a coloured multi-tonal image visible both in reflection and transmission.

19. A security feature according to claim 18, wherein the first and the second printed working are applied to opposing surfaces of the substrate.

20. A security feature according to either claim 18 or 19, wherein the multi-tonal image is visible from either side of the substrate.

21 . A security feature according to any one of claims 18 to 20, wherein the multi- tonal image appears substantially similar in reflection and transmission.

22. A security feature according to any one of claims 18 to 21 , wherein the first printed working is formed in a substantially white or grey colour, and the second printed working is formed in a different colour which visually contrasts with white or grey, for example, blue.

23. A security feature according to any one of claims 18 to 22, wherein the first and the second printed working are both formed using a gravure printing unit in an in-line process, said gravure printing unit includes a gravure cylinder having an printing surface.

24. A security feature according to claim 23, wherein the printing surface of the gravure cylinder includes an array of ink cells configured to receive ink during an image printing process, wherein the ink cells are modulated in accordance with tonal variation that is required to produce the multi-tonal effect.

25. A security feature according to any one of claims 18 to 24, wherein the first printed working is a halftone image in which tonal variation is produced by variously sized dots of ink.

26. A security feature according to any one of claims 18 to 25, wherein the security feature is formed in a window or a half-window region of a security substrate, wherein said security substrate can be printed upon and further processed into a security document.

27. A security feature according to any one of claims 1 to 26, wherein the substrate is substantially transparent and is made from a polymeric material.

28. A security document including one or more security features of any one of claims 1 to 27.

29. A security document according to claim 28, comprising one or more overlapping opacifying layers disposed on the first and/or second surfaces of the substrate, wherein at least some of the opacifying layers are semi-opaque.

30. A method of making a security document incorporating one or more security features according to any one or more of claims 1 to 27.