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1. (WO2017003351) PROCÉDÉ D'IMPRESSION D'UNE IMAGE POLYCHROME FLUORESCENTE ET MATIÈRE IMPRIMÉE OBTENUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. Method of printing a fluorescent full colour image, which emits detectable fluorescent light when illuminated with an UV-light source, wherein the colours are visible under illumination with the UV-light source, the method comprising steps of:

i) Providing a printing substrate comprising an optical whitening agent, wherein the whitening agent constitutes the blue component (B) in an additive RGB-colour model;

ii) Determining a value for the blue component (B) in the substrate, which the blue component (B) has an emission wave length from about 400 to about 500 nm;

iii) Separating colour components of the fluorescent colour image into red, green and blue colour components in the additive RGB-colour model; iv) Calculating an intensity of the blue colour component (B), having an emission wave length from about 400 to about 500 nm in the image, by utilizing the constant value of the blue colour component (B) in the substrate to obtain a desired intensity for the blue component (B) in the image to be printed;

v) Calculating an intensity of a red colour component (R), having an emission wave length from about 600 to about 700 nm in the image, to obtain a desired intensity for the red component (R) in the image to be printed;

vi) Calculating an intensity of a green colour component (G), having an emission wave length from about 500 to about 600 nm in the image, to obtain a desired intensity for the green component (G) in the image to be printed;

vii) Printing the red colour component (R) of the image to the substrate with an ink comprising a red fluorescent colour component;

viii) Printing the green component (G) of the image to the substrate with an ink comprising a green fluorescent colour component.

2. Method according to claim 1, wherein the intensity of the red and green colour components is adjusted such as to provide a full colour image by using only the red and green colour inks.

3. Method according to claim 1 or 2, wherein the intensities of the red and green colour components are adjusted to mask the blue colour component at the areas of the image where the blue colour component is not desired.

4. Method according to claim 1 or 2, wherein the blue colour component is masked by using a pigment able to mask the optical whitening agent at the areas of the image where the blue colour component is not desired.

5. Method according to any one of the preceding claims, wherein the red and green colour components in the image are halftoned to provide continuous tones.

6. Method according to claim 5, wherein the red and green colour components are halftoned using dependent color halftoning.

7. Method according to any one of the preceding claims, wherein the printing substrate is paper or paperboard comprising the optical whitening agent.

8. Method according to any one of the preceding claims, wherein the printing is performed by using a digital printing method.

9. Method according to claim 8, wherein the printing is performed by using an inkjet printer.

10. Method according to any one of the preceding claims 1-7, wherein the printing is performed by using a printing method chosen from lithography, offset printing, flexography, gravure or combinations thereof.

11. Method according to any one of the preceding claims, further comprising a step of printing an image visible in a day light by using cyan (C), magenta (M), yellow (Y) and black (K) colour components.

12. Method according to claim 11, wherein the image visible in the day light is used to mask the fluorescent colour image during the day light illumination.

13. Method according to any one of the preceding claims, wherein the fluorescent colour image is further tagged with using DNA, nanoparticles, magnetic or thermochromatic inks or combinations thereof.

14. Printed fluorescent colour image emitting detectable fluorescent light when illuminated with an UV-light source and wherein the colours are visible under the UV- light source, wherein the printed fluorescent colour image is provided on a printing substrate comprising an optical whitening agent, wherein the whitening agent constitutes the blue component (B) in an additive RGB-colour model, and wherein the red colour component (R) of the image is printed to the substrate with an ink comprising a red fluorescent colour component and the green component (G) of the image is printed to the substrate with an ink comprising a green fluorescent colour component, and wherein the printed fluorescent colour image is obtained by the method according to any one of the claims 1-13.

15. Printed image according to claim 14, wherein the fluorescent colour image comprises also colours visible in day light.

16. Printed image according to claim 14 or 15, wherein the image comprises security features.

17. Use of the printed fluorescent colour image according to any one of the preceding claims 14-16 in packages, identification documents, passports, bank notes, in product authentication documents or bar codes or other optically readable data codes comprising product data.