Antifalsification paper provided with applied coding consisting of luminescent mottled fibers
View Patent ↗The invention relates to a security paper with at least two types of mottled fibers, which differ in terms of their luminescent characteristics and form a code. In each case one type of mottled fibers is present in a defined subarea of the security paper, and the code is represented by the defined geometric arrangement of the subareas on the security paper and/or by the presence or absence of mottled fibers of a specific type.
1. Security paper comprising at least two types of mottled fibres with mutually different luminescent characteristics;
wherein the security paper has at least two non-overlapping subareas in which there is only one specific type of mottled fibres, respectively, the type of mottled fibers being specific for the respective subarea;
wherein an information is equally coded by a geometric arrangement of the subareas and the presence of the types of mottled fibres.
2. Security paper according to claim 1 , wherein the mottled fibres contain luminescent substances with characteristic luminescent characteristics.
3. Security paper according to claim 2 , wherein the luminescent substances have a spectrally narrow emission band.
4. Security paper according to claim 2 , wherein the luminescent substances emit outside the visual spectral range.
5. Security paper according to claim 2 , wherein the luminescent substances comprise optical intensifying materials which comprise an optically pumpable, light-emitting material, light-scattering centers and a transparent matrix material.
6. Security paper according to claim 2 , wherein the luminescent substances are present in the volume of the mottled fibres.
7. Security paper according to claim 2 , wherein the mottled fibres are dyed with the luminescent substances.
8. Security paper according to claim 1 , wherein the mottled fibres comprise a plastic material.
9. Security paper according to claim 1 , wherein the mottled fibres have been introduced into the security paper during the paper manufacture.
10. Security paper according to claim 1 , wherein the mottled fibres have been introduced into the security paper by means of the Wilcox process.
11. Security paper according to claim 1 , wherein the geometric arranged subareas are in the form of strips.
12. Security paper according to claim 11 , wherein the width of each strip lies in the range from 5 mm to 30 mm.
13. Security paper according to claim 1 , wherein the mottled fibre density in the subareas lies in the range of 2 to 20 mottled fibres per square centimeter.