Security device and novel anti-counterfeit product employing same
Paper-based security devices having printed marks or indicia on one surface that are visible from that surface and from an opposing surface of the security device, are provided. The present invention further provides a method of making such paper-based security devices as well as security documents having at least one such security device embedded therein and/or mounted thereon.
1. A security device suitable for use on or within a security document, which comprises an elongated tissue paper substrate having a length of from about 1 to about 10 millimeters, a wet tensile strength in the machine direction of at least about 6.5 Newtons per 25 millimeter width and opposing planar surfaces, wherein the substrate has marks all of which are printed on only one surface, all of the marks being visible only under ultraviolet and/or infrared light from the printed surface and all of the marks being visible from the opposing surface of the substrate.
2. The security device of claim 1 , wherein the tissue paper substrate has a thickness ranging from about 15 to about 40 microns, a density ranging from about 0.3 to about 1.0 gram per cubic centimeter, and a basis weight ranging from about 5 to about 30 grams per square meter.
3. The security device of claim 1 , wherein the marks are in the form of parallel stripes that are printed in two or more colors along the length of the elongated substrate using ultraviolet fluorescent inks and/or infrared fluorescent inks.
4. The security device of claim 1 , wherein the marks are in the form of parallel stripes and text that are printed along the length of the elongated substrate using ultraviolet fluorescent inks and/or infrared fluorescent inks.
5. The security device of claim 1 , wherein the security device further comprises a coating of a clear or pigment-free varnish on the tissue paper substrate, wherein the marks are printed on the varnish coating.
6. The security device of claim 5 , wherein the clear or pigment-free varnish is a heat/air curable water-based varnish.
7. A security document having at least one security device as claimed in claim 1 embedded therein and/or mounted thereon.
8. The security document of claim 7 , wherein the tissue paper substrate of the security device(s) has a thickness ranging from about 15 to about 40 microns, a density ranging from about 0.3 to about 1.0 gram per cubic centimeter, and a basis weight ranging from about 5 to about 30 grams per square meter.
9. The security document of claim 7 , wherein the marks are in the form of parallel stripes that are printed in two or more colors along the length of the elongated substrate using ultraviolet fluorescent inks and/or infrared fluorescent inks.
10. The security document of claim 7 , wherein the marks are in the form of parallel stripes and text that are printed along the length of the elongated substrate using ultraviolet fluorescent inks and/or infrared fluorescent inks.
11. The security document of claim 7 , wherein the security device further comprises a coating of a clear or pigment-free varnish on the paper substrate, wherein the marks are printed on the varnish coating.
12. The security document of claim 11 , wherein the clear or pigment-free varnish is a heat/air curable water-based varnish.
13. The security document of claim 7 , wherein the at least one security device is incorporated in a substantially random position in the document.
14. A method of making a security paper, the method comprising, mixing the security devices of claim 1 with a stock suspension of papermaking fibers fed to a papermaking machine so that the security devices are randomly distributed among the papermaking fibers, and forming the security paper so that the security devices are incorporated randomly in the paper.
15. A security paper manufactured by the method of claim 14 .
16. A method of making security devices, which comprises:
providing a tissue paper substrate having opposing planar surfaces, wherein the tissue paper substrate has a wet tensile strength in the machine direction of at least about 6.5 Newtons per 25 millimeter width;
optionally, coating a surface of the tissue paper substrate with a clear or pigment-free varnish;
printing marks on only one surface of the tissue paper substrate using ultraviolet fluorescent inks and/or infrared fluorescent inks; and
cutting the printed tissue paper substrate into any desired shape or form.
17. The method of claim 16 , which further comprises coating a surface of the tissue paper substrate with a clear or pigment-free varnish onto which the marks are printed.
18. The method of claim 16 , wherein the tissue paper substrate has a thickness ranging from about 15 to about 40 microns, a density ranging from about 0.3 to about 1.0 gram per cubic centimeter, and a basis weight ranging from about 5 to about 30 grams per square meter.
19. A security device manufactured by the method of claim 16 .
20. A security device suitable for use on or within a security document, which comprises a tissue paper substrate having a wet tensile strength in the machine direction of at least about 6.5 Newtons per 25 millimeter width and opposing planar surfaces, wherein the substrate has marks all of which are printed on only one surface, all of the marks being visible only under ultraviolet and/or infrared light from the printed surface and all of the marks being visible from the opposing surface of the substrate.