EP3459758B1 - Procédé de fabrication d'un document de valeur et dispositif d'impression - Google Patents

Procédé de fabrication d'un document de valeur et dispositif d'impression Download PDF

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Publication number
EP3459758B1
EP3459758B1 EP18000744.5A EP18000744A EP3459758B1 EP 3459758 B1 EP3459758 B1 EP 3459758B1 EP 18000744 A EP18000744 A EP 18000744A EP 3459758 B1 EP3459758 B1 EP 3459758B1
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EP
European Patent Office
Prior art keywords
effect pigments
curing
ink
takes place
magnetically
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.)
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EP18000744.5A
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German (de)
English (en)
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EP3459758A1 (fr
Inventor
Kai Herrmann SCHERER
Christian Fuhse
Michael Rahm
Maik Rudolf Johann Scherer
Raphael DEHMEL
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/20—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields
    • B05D3/207—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields post-treatment by magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • B42D25/373—Metallic 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
    • 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
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation

Definitions

  • the invention relates to a method for producing a document of value, in particular a banknote.
  • the invention also relates to a printing device suitable for carrying out the method.
  • Data carriers such as value or ID documents, or other valuables, such as branded items, are often provided with security elements for protection, which allow the authenticity of the data carrier to be checked and which also serve as protection against unauthorized reproduction.
  • Security elements with effects that depend on the viewing angle play a special role in securing authenticity, as these cannot be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and/or a different graphic motif depending on the viewing angle.
  • Magnetic-orientable effect pigments are commercially available, 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 present in the form of a layered composite, which often has two layers of optical effect layers and one layer in between embedded magnetic layer includes.
  • metallic-reflecting layers as well as color-shifting layer systems, eg with an absorber/dielectric/reflector structure, are possible.
  • the embedded magnetic layer is usually not visible, but is required to align the pigments.
  • the pigments dissolved in an ink are printed onto a carrier substrate, for example banknote paper or a polymeric banknote substrate.
  • the ink is still liquid immediately after printing, so that the platelet-shaped pigments can still move freely within the ink matrix surrounding the pigments.
  • An external magnetic field is then applied, in which the pigments align themselves, with the pigments typically aligning themselves parallel to the field lines as a result of the shape anisotropy.
  • the color matrix surrounding the effect pigments is cured either by UV radiation or by the supply of heat, so that the effect pigments are immobilized in the aligned state.
  • an optically variable effect arises for an observer, for example a light reflection, which runs along the tilting direction when the security element obtained by printing is tilted.
  • different optically variable effects can be realized.
  • the figure 1 shows a paper substrate with a printable security feature based on OVMI pigments, with selective curing in two separate steps is carried out.
  • Area (a) is selectively cured with a laser while applying a first magnetic field, while the remaining pigments in area (b) remain freely movable.
  • the selectively cured area can carry image information in the form of a border or projection.
  • the magnetic particle paint reaches a second magnet.
  • the still freely moving particles in area (b) align themselves in the stray field of the second magnet and are then hardened using UV flood exposure.
  • the areas (a) and (b) now have different orientations of the magnetic particles contained therein. This practice is in Scripture EP 2 468 423 A1 described.
  • the EP 2 468 423 A1 describes the selective curing of a magnetic paint via the use of a laser or multiple lasers in the sense of an array, with the lasers being used either as focused or defocused point lasers or as line lasers. Resolutions ("projection of the laser beam") of 1.59mm to 9.5mm are described. Due to the rather coarse, minimum line width of 1.59 mm, there are inevitably disadvantages in terms of the design choice. So in the course of the laser treatment only a very rough image information in the area (a) of figure 1 be introduced. Motifs with fine line widths, on the other hand, cannot be realised.
  • the areas (a) and (b) of the figure 1 do not nest effectively in one another, because this requires line widths of at most 200 ⁇ m, preferably less than 100 ⁇ m, particularly preferably less than 80 ⁇ m, so that the individual lines are no longer visible to the human eye and the viewer gets the impression that he is seeing a homogeneous picture. Accordingly, on the basis of the prior art, so-called flip effects or superimposed pumping and running effects cannot be implemented.
  • the WO 2016/193252 A1 describes a method for creating layers with an optical effect comprising a motif made up of at least two surfaces of a single hardened layer on a substrate containing a photomask.
  • the method comprises applying a radiation-curable coating composition to the substrate containing the photomask, the composition comprising a photoinitiator and magnetic or magnetizable pigment particles.
  • the WO 2013/017738 A1 describes a method for making a mark (MRK1, MRK2) on a web (WEB1) with forming a first altered portion (DOT1) by directing a laser beam (LB2) on the web (WEB1) so that the fluorescence yield of the web (WEB1 ) at the location of the first altered section (DOT1) is locally reduced, the web (WEB1) containing cellulose fibers and a fluorescent substance (OB1) and wherein the visual contrast between the first altered section (DOT1) and a reference section (REF1) is less than or equal to 5% is when the web (WEB1) is illuminated with essentially white visible light (VIS0) that does not contain UV light (UV0), the chemical composition of the fluorescent dye (OB1) having been chosen in such a way that a trans- Isomer of the fluorescent dye (OB1) is converted into a cis-isomer of the fluorescent dye (OB1) by the Fluorescent dye (OB1) is irradiated with the laser beam (LB2), and the wavelength
  • the U.S. 2017/0157707 A1 describes a method for micromachining a pattern on a material, the pattern consisting of a plurality of spots, comprising the steps of: emitting a spatially and temporally coherent pulsed light beam; dynamically shaping the spatially and temporally coherent pulsed light beam in a modulation plane of a phase modulation dynamic optical modulation device to shape the light beam according to the plurality of points forming the pattern; focusing the light beam so formed by a focusing device onto a surface of the material placed on a worktop in Fourier configuration relative to the plane of modulation; wherein the patterning on the material is performed with a pulse sequence comprising a finite number of pulses of the light beam strictly smaller than the number of points forming the pattern, and wherein the emission of the light beam is controlled so that each pulse has a specific pulse duration between 10 ps and 100 ns.
  • the WO 02/090002 A2 describes methods and apparatus for generating images on coated articles.
  • the methods generally involve applying to a substrate a layer of magnetizable pigment coating in liquid form, the magnetizable pigment coating containing a plurality of magnetic non-spherical particles or flakes.
  • a magnetic field is then applied to selected areas of the pigment coating while the coating is in liquid form, the magnetic field affecting the orientation of selected magnetic particles or flakes changes.
  • the pigment coating is solidified, attaching the reoriented particles or flakes in a non-parallel position to the surface of the coating to create an image, such as a three-dimensional image, on the surface of the coating.
  • the pigment coating can contain various magnetic interference or non-interference particles or flakes, such as magnetic color shifting pigments.
  • the WO 2010/058026 A2 discloses a security document (D) comprising a substrate (S) coated with at least a first coating layer (P) and at least a second coating layer (I) arranged over the first coating layer (P), the second coating layer ( I) has at least one type of magnetic or magnetizable particles (F), characters being contained in the coating layer (I) as a result of a selective orientation of the magnetic or magnetizable particles (F).
  • the invention is based on the object of providing an improved production method for a security feature based on magnetically orientable effect pigments. In particular, finer resolutions are to be achieved.
  • the resolution or line width relates to the projected pixel size or line width of the light source at the location of the printing ink based on magnetically orientable effect pigments that is printed onto the value document substrate.
  • selective curing is to be understood in such a way that a specific or selected area of the printed ink is cured, in particular in order in this way to produce an area with information content and/or a special optically variable effect.
  • the UV radiation is preferably directed UV radiation.
  • the value document substrate provided in step a) is in particular a paper substrate, a plastic substrate, a foil/paper/foil composite substrate (see, for example, WO 2006/066431 A1 ) or a paper/foil/paper composite substrate (see e.g. the WO 2004/028825 A2 ).
  • the document of value substrate provided in step a) is a film substrate for the production of security strips, security threads or security patches or security labels, which are suitable for protecting documents of value, eg banknotes.
  • step f) the irradiation, in particular with UV light, can take place in particular over the entire surface.
  • a value document substrate printed with magnetically orientable effect pigments can be provided in this way, which has a first optical effect (or a first optically variable effect) in a first area of the printed layer and a first optical effect (or a first optically variable effect) in a second area of the printed layer.
  • first optically variable effect deviating second optical effect (or second optically variable effect).
  • a 2D array can be used in the single-shot method.
  • a 2D-DMD, an LCoS (Liquid Crystal on Silicon) technique or an LCD is used here.
  • the optically variable effect is, for example, a light reflex that occurs when the document of value obtained is tilted along the tilting direction.
  • steps e) and f) are mandatory, two regions with different optically variable effects can be obtained.
  • OVMI pigments is used instead of the wording "magnetically orientable effect pigments".
  • the subject matter of the invention is also a printing device defined in claim 13 for carrying out the production method according to the invention.
  • the printing device comprises a device for the selective curing, which is a device adapted to carry out the LCoS (Liquid Crystal on Silicon) technique, or the device for the selective curing is an absorption mask or a micromirror actuator (DMD) or a LCD or a diffractive optical element (DOE) or a lens array.
  • a device for the selective curing is a device adapted to carry out the LCoS (Liquid Crystal on Silicon) technique
  • the device for the selective curing is an absorption mask or a micromirror actuator (DMD) or a LCD or a diffractive optical element (DOE) or a lens array.
  • DMD micromirror actuator
  • DOE diffractive optical element
  • the printing device additionally has a device for generating a second magnetic field, which differs from the first magnetic field and is suitable for not yet immobilized, magnetically orientable effect pigments in a hitherto to orient or align the not yet irradiated, second area outside of the first area of the printed ink.
  • the printing device is preferably a screen printing device or screen printing machine.
  • One embodiment is based on the use of an absorption mask.
  • the simplest way to shape a light beam is to use a mask that is opaque with respect to the wavelength used.
  • a mask that is opaque with respect to the wavelength used.
  • this can be, for example, a metallic grid or a metallic form, in particular based on aluminum, chromium, iron or the like.
  • the mask is applied to a transparent substrate, e.g. glass, in a suitable material thickness, which is in particular greater than 200 nm.
  • the disadvantage of using a mask is the diffraction effect under laser irradiation, which leads to the mask being smeared out in the OVMI plane.
  • a further exemplary embodiment is based on the use of a micromirror actuator or DMD.
  • Typical parameters are around 4 million pixels with a diagonal of 0.7 inches.
  • a micromirror actuator is based on a mirror array, i.e. a matrix-like arrangement of individual elements, with each individual element containing a tiltable reflecting surface with an edge length of a few micrometers.
  • Each micromirror can be controlled flexibly via the force of electrostatic fields. The orientation of each mirror can be changed up to 5000 times within one second.
  • light from a strong UV lamp or a laser can be deflected or reflected in such a way that an image (in the sense of an intensity modulation) is projected in the plane of the magnetic paint and hardens there pixel-selectively.
  • additional projection lenses or other optical means can be used.
  • DMD or micro-mirror actuators ensure resolutions well below 1.6mm and, with diameters of several centimetres, are larger than conventional security features based on OVMI pigments and obtained by printing. It would therefore be conceivable that each To expose OVMI pigment directly using a DMD without additional optical means and to achieve line widths in the micrometer range.
  • the figure 2 illustrates the selective curing of a colored layer with OVMI pigments, with the micromirror actuator (DMD, 2D array) reflecting the incoming radiation and generating a freely selectable intensity modulation on the substrate level.
  • the single-shot method is shown in the drawing. Any optics that may be present between the micromirror actuator and the color layer with OVMI pigments are not shown.
  • the figure 3 illustrates a line-based, selective curing of a color layer with OVMI pigments in the form of a circle using a 1D-DMD array, in which the mirrors continuously change their slope while the substrate passes underneath.
  • a further exemplary embodiment is based on the use of an LCoS ("Liquid Crystal on Silicon", translated into German: liquid crystals on [a] silicon [substrate]), in particular in reflection.
  • LCoS Liquid Crystal on Silicon
  • Typical parameters are a chip size with a diagonal of 15.5 mm, an image size of 1920 x 1080 pixels, a reflectivity of 74% and a contrast ratio of more than 5000:1.
  • An LCoS can be used in the same process. This includes a silicon foil (acts as a reflector), a thin layer based on liquid crystals arranged on top of it and a thin pane of glass. In contrast to the micromirrors of the DMD, in the case of the LCoS, liquid crystal molecules are controlled by an electrical voltage. the Alignment of the latter determines whether or not light can successfully re-pass the polarizer, ie whether light is reflected or absorbed by the LCoS. In contrast to the DMD, the LCoS requires polarized light and thus a higher output power of the light source. A 1D design or a 2D design of the chip is also possible here.
  • an LCoS can be used not only in reflection but also in transmission.
  • a further exemplary embodiment is based on the use of an LCD or a liquid crystal display, in particular in transmission.
  • an LCD In contrast to LCoS, an LCD has two polarizers and is operated in transmission, i.e. without a reflective layer. Depending on the orientation of the liquid crystal, this changes the polarization of the light and decides whether light can pass through the second polarizer or not.
  • LCD, LCoS and DMD are, so to speak, electronically “switchable” masks.
  • DOE diffractive optical element
  • Diffractive optical elements are glass substrates onto which microstructures are applied using lithographic processes. In them, phase modulation occurs due to different optical path lengths (particularly due to variations in height or variations in refractive index) of the partial beams, as a result of which interference patterns arise which, due to constructive and destructive superimposition, cause amplitude modulations generate.
  • the intensity pattern of a laser beam - after transmission through the DOE - can be manipulated and the beam can be shaped accordingly.
  • DOEs of high quality have high transmission values and efficiency values, ie they only slightly reduce the power of the input intensity.
  • Another embodiment is based on the use of a microlens array.
  • each microlens focuses the incident light at a point below the lens plane.
  • a chessboard-like hardening of the magnetic paint could be achieved.
  • 1D lenticular arrays e.g. cylindrical lenses
  • variable grids can be generated when illuminating a lens array by varying the size and/or the distances and/or the shape and/or the regularity of the individual lenses.
  • the figure 6 shows a lens array in combination with UV flood exposure for checkerboard curing of a color layer with OMVI pigments.
  • the method according to the invention offers numerous advantages over the prior art.
  • Various optical effects are known in the prior art which can be achieved by means of magnetic alignment of pigments and subsequent radiation curing. Also known is the possibility of combining several different effects with one another by selective radiation curing. So far, however, only macroscopic surfaces (namely with a resolution greater than 1.6 mm) can be used for such combinations. However, in order to make different effects visible at the same time and in the same place, many microscopic surfaces (namely with a resolution of less than 200 ⁇ m) must be combined (or “nested”) with one another so that no disturbing grids are visible. This is possible using one or more of the techniques described herein.
  • Flip effects can be realized in which a certain effect is visible from one viewing angle range over the entire base area of the security feature, and another effect is visible from a different viewing angle range over the entire base area of the security feature.
  • Various movement effects can also be seamlessly combined with one another.
  • the nesting mechanism works as follows: Below the resolution limit of the eye, a certain proportion of the OVMI area - in the form of a checkerboard pattern or line pattern - is covered with an effect (a).
  • This effect (a) can only be seen from a viewing angle of e.g. 45°.
  • the remaining free area is covered with an effect (b), which can only be seen at an angle of e.g. -45°.
  • the gridding or interleaving of the two effects is not recognizable to the human eye. Now the observer sees the effect (a) over the entire surface under 45° and the effect (b) over the entire surface under -45°.

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Claims (16)

  1. Procédé de fabrication d'un document de valeur, en particulier un billet de banque, comprenant
    a) la mise à disposition d'un substrat pour document de valeur,
    b) l'impression du substrat pour document de valeur avec une encre d'impression basée sur des pigments à effets magnétiquement orientables ;
    c) tant que l'encre d'impression imprimée est encore liquide, l'orientation ou l'alignement des pigments à effets magnétiquement orientables au moyen d'un premier champ magnétique ;
    d) le durcissement sélectif de la matrice de couleur entourant les pigments à effets magnétiquement orientés, par rayonnement UV ou par rayonnement laser dans une première zone de l'encre d'impression imprimée, de telle sorte que les pigments à effets sont immobilisés dans l'état aligné, cependant que le durcissement a lieu à une résolution ou à une largeur de ligne inférieure à 1,59 mm,
    caractérisé en ce que
    au moyen du durcissement sélectif de la matrice de couleur entourant les pigments à effets magnétiquement orientés, des zones d'image imbriquées les unes dans les autres sont générées, lesquelles présentent respectivement une résolution ou une largeur de ligne inférieure à 200 µm.
  2. Procédé selon la revendication 1, comprenant en outre
    e) l'étape dans laquelle le substrat pour document de valeur obtenu est exposé à un deuxième champ magnétique différent du premier champ magnétique afin de, de cette manière, orienter ou aligner, dans une deuxième zone non encore irradiée, à l'extérieur de la première zone de l'encre d'impression imprimée, des pigments à effets magnétiquement orientables non encore immobilisés ; et
    f) le durcissement de la matrice de couleur entourant les pigments à effets magnétiquement orientés dans la deuxième zone de l'encre d'impression imprimée, par rayonnement, en particulier par rayonnement UV, de telle sorte que les pigments à effets sont immobilisés dans l'état aligné.
  3. Procédé selon une la revendication 1 ou 2, cependant que le durcissement sélectif a lieu à l'étape d) par utilisation d'un masque d'absorption ou d'un dispositif de micro-miroirs (DMD) ou d'une technique LCoS (cristaux liquides sur silicium) ou d'un LCD ou d'un élément optique diffractif (DOE) ou d'un réseau de lentilles.
  4. Procédé selon une des revendications de 1 à 3, cependant que le durcissement sélectif a lieu à l'étape d) dans un procédé Single Shot.
  5. Procédé selon une des revendications de 1 à 4, cependant que le durcissement sélectif à l'étape d) est un durcissement basé sur lignes.
  6. Procédé selon une des revendications de 1 à 5, cependant que le durcissement sélectif à l'étape d) a lieu au moyen d'une technique LCoS (cristaux liquides sur silicium), en particulier en réflexion.
  7. Procédé selon une des revendications de 1 à 5, cependant que le durcissement sélectif à l'étape d) a lieu au moyen d'un LCD.
  8. Procédé selon une des revendications de 1 à 5, cependant que le durcissement sélectif à l'étape d) a lieu par utilisation d'un élément optique diffractif (DOE), en particulier en relation avec du rayonnement laser.
  9. Procédé selon une des revendications de 1 à 5, cependant que le durcissement sélectif à l'étape d) a lieu par utilisation d'un réseau de lentilles, en particulier en relation avec un éclairage UV (global) dirigé.
  10. Procédé selon une des revendications de 1 à 9, cependant que le durcissement sélectif, à l'étape d), et éventuellement à l'étape f), de la matrice de couleur entourant les pigments à effets magnétiquement orientés, a lieu de telle façon que les pigments à effets sont immobilisés dans l'état aligné et génèrent de cette manière un effet optiquement variable.
  11. Procédé selon une des revendications de 1 à 10, cependant que, au moyen du durcissement sélectif de la matrice de couleur entourant les pigments à effets magnétiquement orientés, une information d'image sous forme de caractères ou d'une codification, ou sous forme d'un motif, d'une bordure ou d'une projection est générée.
  12. Procédé selon une des revendications de 1 à 11, cependant que, au moyen du durcissement sélectif de la matrice de couleur entourant les pigments à effets magnétiquement orientés, des zones d'image imbriquées les unes dans les autres sont générées, lesquelles présentent respectivement une résolution ou une largeur de ligne inférieure à 100 µm et de préférence inférieure à 80 µm.
  13. Dispositif d'impression pour l'exécution du procédé selon une des revendications de 1 à 12, comprenant un équipement pour la mise à disposition d'un substrat pour document de valeur, un équipement pour l'impression du substrat pour document de valeur avec une encre d'impression basée sur des pigments à effets magnétiquement orientables, un équipement pour l'orientation ou l'alignement des pigments à effets magnétiquement orientables au moyen d'un premier champ magnétique, et un équipement pour le durcissement sélectif de la matrice de couleur entourant les pigments à effets magnétiquement orientés, par rayonnement UV ou par rayonnement laser dans une première zone de l'encre d'impression imprimée, de telle sorte que les pigments à effets sont immobilisés dans l'état aligné, cependant que le durcissement a lieu à une résolution ou à une largeur de ligne inférieure à 1,59 mm, et que, au moyen du durcissement sélectif de la matrice de couleur entourant les pigments à effets magnétiquement orientés, des zones d'image imbriquées les unes dans les autres sont générées, lesquelles présentent respectivement une résolution ou une largeur de ligne inférieure à 200 µm.
  14. Dispositif d'impression selon la revendication 13, cependant que l'équipement pour le durcissement sélectif est un équipement adapté à l'exécution de la technique LCoS (cristaux liquides sur silicium, ou l'équipement pour le durcissement sélectif comporte un masque d'absorption ou un dispositif de micro-miroirs (DMD) ou un LCD ou un élément optique diffractif (DOE) ou un réseau de lentilles.
  15. Dispositif d'impression selon la revendication 13 ou 14, cependant que le dispositif d'impression comporte en outre un équipement pour la génération d'un deuxième champ magnétique qui est différent du premier champ magnétique et qui est adapté à orienter ou aligner, dans une deuxième zone non encore irradiée, à l'extérieur de la première zone de l'encre d'impression imprimée, des pigments à effets magnétiquement orientables non encore immobilisés.
  16. Dispositif d'impression selon une des revendications de 13 à 15, cependant que le dispositif d'impression est un dispositif de sérigraphie.
EP18000744.5A 2017-09-22 2018-09-19 Procédé de fabrication d'un document de valeur et dispositif d'impression Active EP3459758B1 (fr)

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CN112976869A (zh) * 2021-03-17 2021-06-18 中钞印制技术研究院有限公司 防伪元件、制作方法、装置、磁性墨水的制作方法和介质
US11427026B1 (en) 2021-03-23 2022-08-30 Viavi Solutions Inc. Orienting magnetic flakes within a binder layer
TW202239482A (zh) 2021-03-31 2022-10-16 瑞士商西克帕控股有限公司 用於產生包含磁性或可磁化顏料粒子且展現一或更多個標記的光學效應層之方法
JP2024522162A (ja) * 2021-06-11 2024-06-11 シクパ ホルディング ソシエテ アノニム 磁性又は磁化可能顔料粒子を含む光学効果層並びに前記光学効層を生成するための方法
WO2023161464A1 (fr) 2022-02-28 2023-08-31 Sicpa Holding Sa Procédés de production de couches à effet optique comprenant des particules pigmentaires magnétiques ou magnétisables et présentant un ou plusieurs indices
WO2024028408A1 (fr) 2022-08-05 2024-02-08 Sicpa Holding Sa Procédés de production de couches à effet optique comprenant des particules de pigment magnétiques ou magnétisables et présentant un ou plusieurs indices
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