EP3459758A1 - Document de valeur, son procédé de fabrication et imprimante - Google Patents

Document de valeur, son procédé de fabrication et imprimante Download PDF

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Publication number
EP3459758A1
EP3459758A1 EP18000744.5A EP18000744A EP3459758A1 EP 3459758 A1 EP3459758 A1 EP 3459758A1 EP 18000744 A EP18000744 A EP 18000744A EP 3459758 A1 EP3459758 A1 EP 3459758A1
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EP
European Patent Office
Prior art keywords
effect pigments
curing
pigments
value document
selective curing
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.)
Granted
Application number
EP18000744.5A
Other languages
German (de)
English (en)
Other versions
EP3459758B1 (fr
Inventor
Kai Herrmann SCHERER
Christian Fuhse
Michael Rahm
Maik Rudolf Johann Scherer
Raphael DEHMEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
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Filing date
Publication date
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Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3459758A1 publication Critical patent/EP3459758A1/fr
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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 value document, in particular a banknote, and a document of value 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 most modern copiers.
  • the security elements are thereby equipped with optically variable elements that give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • Magnetically 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 in the form of a layer composite, often comprising two layers of optical effect layers and one in between embedded magnetic layer includes.
  • metallic-reflecting layers as well as color-shifting layer systems, eg with an absorber / dielectric / reflector structure, are suitable.
  • the embedded magnetic layer is usually invisible, but is required to align the pigments.
  • the pigments dissolved in a printing ink are printed on a carrier substrate, for example banknote paper or a polymeric banknote substrate.
  • a carrier substrate for example banknote paper or a polymeric banknote 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, the pigments typically being 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 that runs along the tilting direction when tilting the printing technology security element obtained.
  • various optically variable effects can be realized.
  • FIG. 1 shows a paper substrate with a printable security feature based on OVMI pigments, with selective cure in two separate steps is carried out.
  • the region (a) is selectively cured with a laser while applying a first magnetic field, while the remaining pigments in the region (b) remain freely movable.
  • the selectively cured area can carry image information in the form of a border or projection.
  • the magnetic particle ink reaches a second magnet.
  • the still freely moving particles in region (b) align themselves in the stray field of the second magnet and are subsequently cured by means of a UV flood exposure.
  • the regions (a) and (b) now carry different orientations of the magnetic particles contained therein. This procedure is in the Scriptures EP 2 468 423 A1 described.
  • the EP 2 468 423 A1 describes the selective curing of a magnetic ink via the use of a laser or several lasers in the sense of an array, wherein the lasers are used either as focused or defocused point lasers or as line lasers. It describes resolutions ("projection of the laser beam") from 1.59mm to 9.5mm. Due to the very rough, minimal line width of 1.59 mm, there are inevitably disadvantages in terms of design choice. Thus, in the course of the laser treatment, only a very rough image information in the area (a) of FIG. 1 be introduced. Motives with fine weights can not be realized. Furthermore, the areas (a) and (b) of the FIG.
  • this line widths of at most 200 microns, preferably less than 100 microns, more preferably less than 80 microns, are needed so that the individual lines are no longer visible to the human eye and the viewer gets the impression he sees a homogeneous picture. Accordingly, based on the state of the art so-called flip effects or overlapping pumping and running effects can not be realized.
  • the object of the invention is to provide an improved production method for a security feature based on magnetically orientable effect pigments. In particular, finer resolutions should be achieved.
  • the resolution or line width refers to the projected pixel size or line width of the light source at the location of the ink printed on the value document substrate and based on magnetically orientable effect pigments or OVMI pigments.
  • selective curing is to be understood as meaning that a specific or selected area of the printed ink is cured, in particular in order in this way to produce a region with information content and / or a particular optically variable effect.
  • the UV radiation is preferably a directed UV radiation.
  • the value document substrate provided in step a) is in particular a paper substrate, a plastic substrate, a film / paper / foil composite substrate (see, for example, US Pat WO 2006/066431 A1 ) or a paper / foil / paper composite substrate (see eg WO 2004/028825 A2 ).
  • the invention furthermore relates to a printing device for carrying out the production method according to the invention, comprising a device for providing a value document substrate, a device for printing the value document substrate with an ink based on magnetically orientable effect pigments or OVMI pigments, a device for orienting or Aligning the magnetically orientable effect pigments by means of a first magnetic field and means for selectively curing the color matrix surrounding the magnetically-oriented effect pigments by UV radiation or by laser radiation in a first region of the printed ink such that the effect pigments are immobilized in the aligned state, wherein the curing is at a resolution or linewidth, respectively less than 1.59 mm, preferably less than 800 ⁇ m.
  • the printing device has a selective cure device that is adapted to perform the liquid crystal on silicon (LCoS) technique, or the selective cure device comprises an absorption mask or a micro-mirror actuator (DMD) or a micromirror actuator (DMD) LCD or a diffractive optical element (DOE) or a lens array.
  • the selective cure device comprises an absorption mask or a micro-mirror actuator (DMD) or a micromirror actuator (DMD) LCD or a diffractive optical element (DOE) or a lens array.
  • DMD micro-mirror actuator
  • DMD micromirror actuator
  • DOE diffractive optical element
  • the printing device additionally has a device for generating a second magnetic field deviating from the first magnetic field, which is suitable for non-immobilized, magnetically orientable effect pigments in a second region, which has not yet been irradiated, outside the first region of the printed image Orient or align printing 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 form a light beam is based on the use of a mask which is opaque with respect to the wavelength used.
  • a mask which is opaque with respect to the wavelength used.
  • this may e.g. a metallic grid or a metallic form, in particular based on aluminum, chromium, iron or the like.
  • the mask is coated in a suitable material thickness, in particular greater than 200 nm, onto a transparent substrate, e.g. Glass, applied.
  • Another embodiment is based on the use of a micromirror actuator or DMD.
  • Typical parameters are about 4 million pixels with a diagonal of 0.7 inches.
  • a micro-mirror actuator is based on a mirror array, ie a matrix-like arrangement of individual elements, wherein each individual element includes a tiltable reflecting surface with an edge length of a few micrometers.
  • Each micromirror can be controlled flexibly by the force of electrostatic fields. The orientation of each mirror can be changed within a second up to 5000 times.
  • 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 ink and selectively hardens in a pixel-selective manner.
  • projection lenses or other optical means can additionally be used.
  • FIG. 2 illustrates the selective curing of a color layer with OVMI pigments, wherein the micromirror actuator (DMD, 2D array) reflects the incident radiation and generates a freely selectable intensity modulation on the substrate plane. Illustrated is the single-shot method. Optionally existing optics between the micromirror actuator and the color layer with OVMI pigments is not shown.
  • FIG. 3 Figure 1 illustrates a line-based, selective cure of a color layer with OVMI pigments in the form of a circle by means of a 1D DMD array, in which the mirrors continuously change their pitch as the substrate passes underneath.
  • Another 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 greater than 5000: 1.
  • an LCoS can be used. This includes a silicon foil (acts as a reflector), a thin layer of liquid crystal based thereon, and a thin glass sheet.
  • a silicon foil acts as a reflector
  • a thin layer of liquid crystal based thereon in contrast to the micromirrors of the DMD, in the case of the LCoS liquid crystal molecules are driven by an electrical voltage. The orientation of the latter determines whether or not light can successfully pass the polarizer again, i. whether light is reflected or absorbed by the LCoS.
  • the LCoS requires polarized light and thus a higher output power of the light source. Again, a 1D design or a 2D design of the chip is possible.
  • an LCoS can be used not only in reflection but also in transmission.
  • Another embodiment is based on the use of an LCD or a liquid crystal display, in particular in transmission.
  • An LCD in contrast to LCoS, has two polarizers and is transmitted in transmission, i. without reflection layer, operated. According to the orientation of the liquid crystal, it changes the polarization of the light and decides whether or not light can pass through the second polarizer.
  • LCD, LCoS and DMD are electronic "switchable" masks, so to speak.
  • DOE diffractive optical element
  • Diffractive optical elements are glass substrates to which microstructures are applied by lithographic techniques. Through different optical path lengths (in particular by height variations or by refractive index variations) of the sub-beams, phase modulations occur in them, resulting in interference patterns which generate amplitude modulations by constructive and destructive superimposition.
  • the intensity patterns of a laser beam - after transmission through the DOE - manipulate and the beam can be shaped accordingly.
  • high-quality DOEs have high transmission values and efficiency values, i. they only slightly reduce the power of the input intensity.
  • Another embodiment is based on the use of a microlens array.
  • each microlens illuminates the incident light at a point below the lens plane.
  • a checkerboard-like curing of the magnetic ink could thus be realized.
  • 1D lenticular screens e.g., cylindrical lenses
  • variable grids can be produced when illuminating a lens array by varying the size and / or the spacings and / or the shape and / or the regularity of the individual lenses.
  • FIG. 6 shows a lens array in combination with a UV flood exposure for the 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, which can be achieved by means of magnetic alignment of pigments and subsequent radiation curing.
  • the possibility of combining several different effects 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.
  • many microscopic surfaces in particular with a resolution of less than 200 ⁇ m must be combined (or “nested") with one another, so that no disturbing rasters are visible. This is possible when using one or more of the techniques described herein. For example, flip effects can be realized where some effect is visible from one viewing angle area on the whole footprint of the security feature, and another effect is visible from another viewing angle area on the whole footprint of the security feature.
  • various motion effects can be seamlessly combined.
  • the nesting mechanism works as follows:
  • This effect (a) is only at a viewing angle of e.g. 45 ° to see.
  • the remaining free area is occupied with an effect (b) which is only at an angle of e.g. -45 ° can be seen.
  • the rasterization or interleaving of the two effects is not recognizable. Now, for the viewer, the effect (a) appears over the entire surface at 45 ° and the effect (b) over the entire surface at below -45 °.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
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EP18000744.5A 2017-09-22 2018-09-19 Procédé de fabrication d'un document de valeur et dispositif d'impression Active EP3459758B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017008919.1A DE102017008919A1 (de) 2017-09-22 2017-09-22 Wertdokument und Verfahren zum Herstellen desselben

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EP3459758A1 true EP3459758A1 (fr) 2019-03-27
EP3459758B1 EP3459758B1 (fr) 2022-11-09

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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
DE102020103147A1 (de) 2020-02-07 2021-08-12 Koenig & Bauer Ag Druckmaschine mit mindestens einem ein magnetische oder magnetisierbare Partikel enthaltendes Druckfluid auf mindestens ein Substrat aufbringenden Druckwerk
WO2021255022A1 (fr) * 2020-06-16 2021-12-23 Ist Metz Gmbh Procédé et dispositif pour le matage de surface différent de couches de polymère durci par rayonnement dans des régions
WO2021259527A1 (fr) 2020-06-23 2021-12-30 Sicpa Holding Sa Procédés de production de couches à effet optique comprenant des particules pigmentaires magnétiques ou magnétisables
US11427026B1 (en) 2021-03-23 2022-08-30 Viavi Solutions Inc. Orienting magnetic flakes within a binder layer
WO2022207692A1 (fr) 2021-03-31 2022-10-06 Sicpa Holding Sa Procédés de production de couches à effet optique comprenant des particules pigmentaires magnétiques ou magnétisables et présentant un ou plusieurs indices
WO2022258521A1 (fr) * 2021-06-11 2022-12-15 Sicpa Holding Sa Couches à effet optique comprenant des particules de pigment magnétiques ou magnétisables et méthodes de production desdites couches à effet optique
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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WO2004028825A2 (fr) 2002-09-19 2004-04-08 Giesecke & Devrient Gmbh Papier de securite
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EP2468423A1 (fr) 2010-12-27 2012-06-27 JDS Uniphase Corporation Système et procédé de formation d'une image sur un substrat
WO2013017738A1 (fr) * 2011-08-03 2013-02-07 Upm-Kymmene Corporation Procédé et appareil de marquage d'un produit
US20170157707A1 (en) * 2014-07-01 2017-06-08 Qiova Micromachining method and system for patterning a material, and method for using one such micromachining system
WO2016193252A1 (fr) * 2015-06-02 2016-12-08 Sicpa Holding Sa Procédés de fabrication de couches à effet optique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020103147A1 (de) 2020-02-07 2021-08-12 Koenig & Bauer Ag Druckmaschine mit mindestens einem ein magnetische oder magnetisierbare Partikel enthaltendes Druckfluid auf mindestens ein Substrat aufbringenden Druckwerk
WO2021255022A1 (fr) * 2020-06-16 2021-12-23 Ist Metz Gmbh Procédé et dispositif pour le matage de surface différent de couches de polymère durci par rayonnement dans des régions
WO2021259527A1 (fr) 2020-06-23 2021-12-30 Sicpa Holding Sa Procédés de production de couches à effet optique comprenant des particules pigmentaires magnétiques ou magnétisables
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
EP4063141A1 (fr) * 2021-03-23 2022-09-28 Viavi Solutions Inc. Procédé d' orientation de paillettes magnétiques à l'intérieur d'une couche de liaison et un article de sécurité
WO2022207692A1 (fr) 2021-03-31 2022-10-06 Sicpa Holding Sa Procédés de production de couches à effet optique comprenant des particules pigmentaires magnétiques ou magnétisables et présentant un ou plusieurs indices
WO2022258521A1 (fr) * 2021-06-11 2022-12-15 Sicpa Holding Sa Couches à effet optique comprenant des particules de pigment magnétiques ou magnétisables et méthodes de production desdites couches à effet optique
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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