EP3802140A1 - Value document, method for manufacturing same and printing device - Google Patents
Value document, method for manufacturing same and printing deviceInfo
- Publication number
- EP3802140A1 EP3802140A1 EP19729438.2A EP19729438A EP3802140A1 EP 3802140 A1 EP3802140 A1 EP 3802140A1 EP 19729438 A EP19729438 A EP 19729438A EP 3802140 A1 EP3802140 A1 EP 3802140A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- security element
- pigments
- medium
- matrix
- element according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/369—Magnetised or magnetisable materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
Definitions
- the invention relates to a method for producing a value document, in particular a banknote, and a document obtainable by the method.
- the invention further relates to a printing device suitable for carrying out the method.
- Data carriers such as valuables or identity documents, or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
- Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the very latest copiers.
- the security elements are equipped with optically variable elements that give the viewer under different viewing angles under a different image impression and, for example, depending on the viewing angle Betray another color or brightness impression and / or another graphic motif.
- Magnetically orientable effect pigments are obtainable commercially, for example, under the trade name OVMI® from SICPA (the abbreviation OVMI stands for the term "optically variable magnetic ink”.)
- the pigments typically have a platelet-like structure and are in the form of a layer composite which often has two With regard to the optical effect layers, metal-reflecting layers as well as color-shifting layer systems, eg with an absorber / dielectric / reflector structure, are suitable. Magnetic layer is usually not visible, but is required for alignment of the pigments.
- the pigments dissolved or dispersed in a printing ink are printed on a support substrate, for example banknote paper or a polymeric bank of note substrate.
- a support substrate for example banknote paper or a polymeric bank of note substrate.
- the ink is still liquid, so that the platelet-shaped pigments within the color matrix surrounding the pigments are still freely movable.
- an external magnetic field is applied, in which the pigments align themselves, wherein the pigments are typically arranged parallel to the field lines due to the shape anisotropy.
- the color matrix surrounding the effect pigments is cured either by UV radiation or by the application of heat, so that the effect pigments are immobilized in the aligned state.
- an optically variable effect such as a light reflection, which runs when tilting the printing technology security element along the tilting direction.
- various optically variable effects can be realized.
- encapsulated, optically variable, magnetic pigments can be realized, which can be applied by printing technology to a printing material.
- encapsulated pigments it is possible to produce printable security elements whose optical effect can be greatly influenced by a magnetic field applied.
- the document WO 2010/142391 Al describes a security element with an optical field changeable by an external magnetic field.
- the security element has a plurality of microcapsules containing a suspension of a carrier liquid and magnetic nanoparticles. The nanoparticles reversibly form a photonic crystal in an external magnetic field of a magnet.
- the encapsulation methods known from the prior art are associated with the disadvantage that e.g. The size of the individual capsules and the number of particles per capsule are controllable only to a limited extent and vary widely.
- many expensive process steps are usually required, e.g. dispersing the particles in oil, dispersing the oil thus obtained in water, conducting an encapsulation, washing and sorting the capsules, preparing a curable printing ink from the capsules and printing the obtained ink onto a printing substrate, followed by Curing the applied ink.
- the present invention has for its object to provide a manufacturing process, which is connected to a simplified production or processing Ver, in particular allows improved control over the capsule size or the capsule size population.
- a security element having an optical appearance variable by an external magnetic field comprising a solid matrix and a plurality of microscopic chambers surrounded by the solid matrix, and the microvoids having a liquid medium and magnetic, are filled by an external magnetic field alignable pigments.
- the magnetic pigments are magnetic effect pigments or magnetic nanoparticles or magnetic liquid crystals.
- Chambers and are not present within the solid matrix may be almost exclusively within the microscopic Kamem netic pigments and are not present within the solid matrix substantially.
- a security element according to clause 1 or 2, wherein magnetic pigments are present both within the microscopic chambers and within the solid matrix and the magnetic pigments present within the solid matrix are not alignable, ie immovable, by an external magnetic field.
- step 2 2) dispersing the capsule medium obtained in step 1 in the liquid matrix medium such that the particles remain in the capsule medium and do not migrate into the matrix medium;
- Matrix medium solidifies while the capsule medium remains liq liquid.
- a security element comprising a solid matrix and a plurality of microscopic chambers enclosed by the solid matrix can be provided microscopic chambers are filled with a liquid medium and particles, for example optically variable pigments and / or nanoparticles
- the solid matrix may also contain particles, eg optically variable pigments and / or nanoparticles.
- the security element according to the invention is essentially flat and preferably has a thickness in a range from 2 mpi to 200 mih, in particular preferably a thickness in a range from 10 mhi to 60 mih.
- the microscopic chambers are substantially spherical and preferably have a diameter in the range of 1 to 100 mih, in particular particular preferably has a diameter in the range of 5 mih to 40 mpa.
- the liquid medium is in particular substantially transparent.
- step 2 In order to ensure that the particles can be dispersed in step 1 and not pass into the matrix medium in step 2, it is preferred to select or modify the particles so as to ensure a sufficiently high miscibility of the particles with the capsule -Medium and a significantly reduced miscibility of the particles with the matrix medium results.
- the particles are introduced only after step 2, provided that the miscibility of the particles is so selective that the particles inevitably accumulate exclusively in the capsule medium.
- the capsule medium and the matrix medium are such that the two media do not dissolve into one another (or form a homogeneous solution together). This can be achieved, for example, by either using insoluble materials or by modifying the materials with additives such that their solubility is sufficiently low. Also possible are methods that lead to a physical barrier, such as the provision of surfactant layers.
- the printing technology applying the mixture in step 3 can example, by gravure, flexographic printing, screen printing or ink jet printing he follow.
- the matrix medium selectively hardens in step 4, it should preferably be chosen so that a polymerization reaction or crosslinking reaction can be started in a controlled manner.
- Possibilities for this are e.g. the activation of a photoinitiator contained in the medium by UV radiation, or the thermal activation of the reaction, e.g. by IR radiation, or the chemical activation of the reaction by addition of a suitable additive.
- Step 3 is analogous to step 3 of the method of manufacturing according to the first preferred embodiment.
- miscibility in the course of curing is required to greatly change. This is e.g. in the case of selective polymerizations, during the polymerization the viscosity of the material increases, at the same time the solubility in other media decreases.
- the system and the curing process are chosen so that the segregation is complete before the viscosity becomes too high, local reorganization occurs and the material solidifies.
- a preferred way of accelerating segregation is based on vibrating the particles in a vibratory manner. This can be achieved, for example, in the case of magnetic particles by the use of a temporally variable, external magnetic field.
- miscibilities can be drastically and selectively changed by modifying the surface of the particles by so-called self-assembled monolayers (or "self-assembled monolayers" or SAMs) .
- Self-organized monolayers can be formed from molecules which have two different ends: one end serves to adhere to the surface to be coated, the other serves to modify the miscibility.
- silane groups, phosphate groups or phosphoric acids can be used.
- hydrocarbon chains are preferably used. In order to impart hydrophobicity to the hydrocarbon chains, the hydrocarbon chains can be fluorinated in particular. To impart hydrophilicity to the hydrocarbon chains, for example, OH groups are used.
- a security element according to the invention is produced on the basis of the above-described manufacturing method according to the first or the second preferred embodiment.
- Particles used are commercially available OVMI® pigments.
- the OVMI® pigments are contained exclusively in the liquid inclusions of the security element.
- the security element can be checked for authenticity, for example by placing a permanent magnet in the vicinity of the security element and perceiving the drastic change in the visual effect by the viewer.
- the security element is characterized by the fact that the lines of light reflection follow the movement of the magnet without noticeable time delay.
- a security element according to the invention is produced on the basis of the above-described manufacturing method according to the first or the second preferred embodiment.
- Particles used are commercially available OVMI® pigments.
- the manufacturing process is modified so that OVMI® pigments are located both in the liquid inclusions of the security element and within the solid matrix.
- a special magnetic field is applied so that both the pigments in the matrix and the pigments in the capsules align with the field lines of the magnetic field. Only the pigments in the capsules can later be influenced with magnetic fields and orient differently, the pigments in the matrix are firmly anchored and fixed with respect to the spatial orientation.
- a viewer always sees an overlay of a constantly the same optically variable effect and a variable optically variable effect. The verification of the authenticity of the security element can therefore also be done without the use of a magnet.
- Embodiment 3 was carried out analogously to Embodiment 2, with the difference that two different types of OVMI® pigments are present in the security element, which are modifi ed such that the OVMI® pigments according to variety 1 are present only in the matrix medi um and the OVMI® pigments according to grade 2 are only present in the capsule medium. Since the OVMI® pigments of variety 1 and variety 2 have different colors, the the optical effects described in the embodiment 2 are still distinguishable deutl cher by the viewer from each other.
Landscapes
- Credit Cards Or The Like (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Printing Methods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018004432.8A DE102018004432A1 (en) | 2018-06-05 | 2018-06-05 | Value document, method for producing the same and printing device |
PCT/EP2019/000169 WO2019233622A1 (en) | 2018-06-05 | 2019-05-28 | Value document, method for manufacturing same and printing device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3802140A1 true EP3802140A1 (en) | 2021-04-14 |
Family
ID=66810747
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19729438.2A Withdrawn EP3802140A1 (en) | 2018-06-05 | 2019-05-28 | Value document, method for manufacturing same and printing device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3802140A1 (en) |
DE (1) | DE102018004432A1 (en) |
WO (1) | WO2019233622A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007059550A1 (en) | 2007-12-11 | 2009-06-25 | Giesecke & Devrient Gmbh | Optically variable security element |
DE102009024447A1 (en) | 2009-06-10 | 2010-12-16 | Giesecke & Devrient Gmbh | Security element with changeable visual appearance |
-
2018
- 2018-06-05 DE DE102018004432.8A patent/DE102018004432A1/en not_active Withdrawn
-
2019
- 2019-05-28 WO PCT/EP2019/000169 patent/WO2019233622A1/en unknown
- 2019-05-28 EP EP19729438.2A patent/EP3802140A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE102018004432A1 (en) | 2019-12-05 |
WO2019233622A1 (en) | 2019-12-12 |
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