WO2019233623A1 - Procédé de fabrication d'un document de valeur, document de valeur et dispositif d'impression - Google Patents

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

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Publication number
WO2019233623A1
WO2019233623A1 PCT/EP2019/000170 EP2019000170W WO2019233623A1 WO 2019233623 A1 WO2019233623 A1 WO 2019233623A1 EP 2019000170 W EP2019000170 W EP 2019000170W WO 2019233623 A1 WO2019233623 A1 WO 2019233623A1
Authority
WO
WIPO (PCT)
Prior art keywords
effect pigments
magnetic field
pigments
magnetically
printing
Prior art date
Application number
PCT/EP2019/000170
Other languages
German (de)
English (en)
Inventor
Tobias Sattler
Jörg Anders
Maik Rudolf Johann Scherer
Kai Herrmann SCHERER
Raphael DEHMEL
Christian Fuhse
Michael Rahm
Thomas Mang
Karlheinz Mayer
Original Assignee
Giesecke+Devrient Currency Technology Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giesecke+Devrient Currency Technology Gmbh filed Critical Giesecke+Devrient Currency Technology Gmbh
Publication of WO2019233623A1 publication Critical patent/WO2019233623A1/fr

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, a document obtainable by the method Wertdo and a printing device for performing the method.
  • Data carriers such as valuables or identity documents, or other items of value, such as branded articles, are often provided with security elements for securing purposes, which permit a 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 copying machines.
  • the security elements are thereby equipped with optically variable elements which give the viewer a different image impression under different viewing angles and, for example, depending on the viewing angle, show a different color or brightness impression and / or another graphic motif.
  • Thin-film systems which produce a viewing angle-dependent color impression on the viewer by means of interference are known in the prior art.
  • This optical effect can serve as an optically variable security element.
  • a large-scale thin-film system can be comminuted by various techniques. The size of the resulting flakes or platelets can be laterally up to a few microns, but the size is mostly in a range from 2pm to 100prn.
  • the vertical structure of a platelet is given by the requirements of the Inter ferenz Anlagenen and is usually as thin as possible, for example in a range of 200 nm to 800 nm.
  • Such platelets come eg in op- Variable color table (so-called OVI color) is used to provide a security element.
  • the pigment platelets have a magnetic moment.
  • Magnetically orienable effect pigments are e.g. commercially available 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 comprises two layers of optical effect layers With regard to the optical effect layers, metallic-reflecting layers as well as color-shifting layer systems, eg with an absorber, are used
  • the embedded magnetic layer is usually not visible, but is required to align the pigments.
  • the pigments are introduced into a transparent binder.
  • the orientation of the pigments can be influenced immediately after printing on a printing material.
  • the binder is cured, for example by means of UV irradiation, in order to fix the orientations of the pigments.
  • the direction of magnetization of the pigments is preferably along the direction of the largest abrasion due to the shape anisotropy.
  • the magnetic moment of the particles is oriented perpendicular to the normal vector of the thin films. If a magnetic field with a field strength with the symbol "Fl" is applied, who the pigments aligned so that their magnetic moments as far as possible parallel to the field vector are (see the attached Figure 1).
  • the magnetic pigments can rotate about axes parallel to their magnetization with the symbol "m", which are arranged perpendicular to the normal vector of the thin films ..
  • the orientation of the pigments is substantially uniform in one direction while being substantially randomized in another direction, thus not always showing a color surface of the pigment upwards (see attached Figure 2), which leads to a widening of the light reflection and to a reduced brilliance and sharpness of the optically variable effect.
  • the object of the present invention is to provide a method by which the control over the arrangement of the magnetic color pigments can be improved to allow in this way a more attractive optical effect.
  • 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 Pa
  • the value document substrate provided in step a) is a film substrate for producing security strips, security threads or security patches or security chains which are used to secure value documents, e.g. Banknotes that are suitable
  • step d) curing can be carried out in particular by means of UV radiation, heat radiation or laser radiation. 2. (Preferred embodiment) Method according to clause 1, wherein in step c) the orientation or alignment of the magnetically orientable effect Pig elements by alternately applying at least two non-parallel magnetic fields.
  • step c) Method according to one of the clauses 1 to 5, wherein in step c) orienting or aligning the magnetically orien zable effect pigments by alternately applying at least two non-parallel magnetic fields in rapid time sequence, preferably in a temporal sequence in a range of 1 sec to 1/200 sec, more preferably in a range of 1/10 sec to 1/50 sec.
  • step c) Method according to one of the clauses 1 to 6, wherein in step c) the temporal variation of a magnetic field is effected by a time-variable control of a plurality of electromagnets with overlapping fields, e.g. with phase shift between the individual magnets, takes place.
  • step c) Method according to one of the clauses 1 to 6, wherein in step c) the temporal variation of a magnetic field by a superposition of a static magnetic field, e.g. is generated by a rest, the permanent magnet and / or electromagnet, on the one hand and a time-variable magnetic field according to one of the clauses 7 to 10 on the other hand.
  • a static magnetic field e.g. is generated by a rest, the permanent magnet and / or electromagnet
  • step c) comprises the single, successive execution of two sub-steps c1) and c2), namely first the sub-step c1), in which the printed ink is still liquid in that the orienting or aligning of the magnetically orientable effect pigments by alternately applying at least two nonparallel magnetic fields he follows to arrange the effect pigments in this way in the form of a pre-orientation, followed by the sub-step c2), in which further orienting or aligning the magnetically orientable effect pigments which are preoriented in the course of step (c1) are formed by applying a static magnetic field so that the effect pigments assume an orientation that is different from the pre-orientation.
  • the document of value may further be in particular a paper banknote, a banknote or composite film banknote, or an identity card or a passport data page.
  • Printing apparatus for carrying out the method according to one of the clauses 1 to 14, comprising a device for providing a value-document substrate, a device for the loading printing the value document substrate with an ink based on magnetically orientable effect pigments or OVMI® pigments, a device for alternately applying at least two non-parallel magnetic fields and a device for curing the color matrix surrounding the magnetically oriented effect pigments.
  • FIG. 1 shows the possible magnetization (with the symbol “m") of an OVMI® pigment and the consequent orientation of the pigment in a magnetic field (with the symbol “H”);
  • Figure 2 shows possible alignments of an OVMI® pigment in the magnetic field (with the symbol “H”) by a rotation about an axis with the symbol "m”;
  • FIG. 3 which refers to the "formula (1)" referred to in the following description.
  • the subject of the present invention is a technique which improves the control over the arrangement of the magnetic color pigments and thus enables a more attractive optical effect. This technique is based on a time-varying magnetic field.
  • a free-moving particle with the magnetization "m” in the magnetic field “H” tries to minimize its potential energy “Epot” according to the “formula (1)” shown in FIG. that its magnetic moment runs as parallel as possible to the magnetic field (see compass needle). If the direction of the magnetic field is changed, depending on the field strength "H”, on the coercive field strength "Hc" of the magnetic material of the pigment and on the viscosity of the surrounding medium, there are two possibilities how the pigment can behave:
  • Case 1 Change of magnetization: the direction of the magnetization of the pigment changes with the magnetic field.
  • Case 2 reorientation: in this case, the magnetization direction does not change; the alignment of the entire pigment follows the magnetic field. Combinations of the above two cases are also conceivable.
  • the aforementioned influencing variables in which essentially only changes in magnetization occur in the pigment level: due to the shape anisotropy, a reorientation is energetically more favorable than a magnetization direction outside the pigment plane.
  • the pigment is thus oriented so that its normal vector is substantially perpendicular to the magnetic field line.
  • the temporal variation of the magnetic field can be e.g. to occur by:
  • All methods can hereby act either "globally”, ie on all pigments of a security element, or "locally”, ie only on pigments within semi-limited subareas of the security element. Particularly attractive is the possibility to produce very finely structured magnetic fields with microelectronic devices with a large number of very small electromagnets.
  • step c) comprises the single, successive performing two sub-steps cl) and c2), namely first the sub-step cl), in which the printed ink is still liquid, the orientation or alignment the magnetically orientable effect pigments by alternately applying at least two non-parallel magnetic fields he follows to arrange the effect pigments in this way in the form of a pre-orientation, followed by sub-step c2), in which a further orientation or alignment of the in the course of the sub-step cl ) in front of oriented, magnetically orientable effect pigments by applying a static magnetic field, so that the effect pigments assume a changed orientation from the pre-orientation.
  • the preferred variant achieves a special attractiveness and brilliance of the color pigments having the effect pigments.
  • the effects obtained are due to the fact that the effect pigments in the alternating field change not only their orientation (i.e., the tilt angle) but also their arrangement (i.e., position in the paint).
  • the effect pigments appear to accumulate in one plane and to be arranged "in shock."
  • the effect pigments thus form a closed layer as possible, which leads to an elevated, usable, reflective surface and thus to an increased brilliance In this way, furthermore, the quantity requirement of the adding effect pigments can be reduced.

Landscapes

  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

L'invention concerne un procédé permettant de fabriquer un document de valeur, en particulier un billet de banque, ledit procédé comprenant les étapes suivantes : disposer d'un substrat de document de valeur; b) imprimer le substrat de document de valeur avec une encre d'impression à base de pigments à effet et/ou de pigments OVMI® ( = encre magnétique optiquement variable); c) tant que l'encre d'impression imprimée est toujours liquide, orienter et ou aligner les pigments à effet à orientation magnétique par application alternée d'au moins deux champs magnétiques non parallèles; d) faire durcir la matrice de couleurs entourant les pigments à effet à orientation magnétique dans l'encre d'impression imprimée, de telle sorte que les pigments à effet sont immobilisés à l'état orienté.
PCT/EP2019/000170 2018-06-05 2019-05-28 Procédé de fabrication d'un document de valeur, document de valeur et dispositif d'impression WO2019233623A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018004430.1A DE102018004430A1 (de) 2018-06-05 2018-06-05 Verfahren zum Herstellen eines Wertdokuments, Wertdokument und Druckvorrichtung
DE102018004430.1 2018-06-05

Publications (1)

Publication Number Publication Date
WO2019233623A1 true WO2019233623A1 (fr) 2019-12-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/000170 WO2019233623A1 (fr) 2018-06-05 2019-05-28 Procédé de fabrication d'un document de valeur, document de valeur et dispositif d'impression

Country Status (2)

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DE (1) DE102018004430A1 (fr)
WO (1) WO2019233623A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022001820A1 (de) 2022-05-24 2023-11-30 Giesecke+Devrient ePayments GmbH Verfahren zum Herstellen einer Folie mit einem Sicherheitsmerkmal für einen kartenförmigen Datenträger, Folie, kartenförmiger Datenträger und Extrusionsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004028825A2 (fr) 2002-09-19 2004-04-08 Giesecke & Devrient Gmbh Papier de securite
WO2006066431A1 (fr) 2004-12-23 2006-06-29 Landqart Structure multicouche servant de substrat d'impression et procede de fabrication
WO2014108303A1 (fr) * 2013-01-09 2014-07-17 Sicpa Holding Sa Couches à effet optique présentant un effet optique dépendant de l'angle de vision, procédés et dispositifs pour leur production, articles comportant une couche à effet optique et leurs utilisations
WO2016083259A1 (fr) * 2014-11-27 2016-06-02 Sicpa Holding Sa Dispositifs et procédés d'orientation de particules de pigment magnétiques ou magnétisables en forme de plaquette

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004028825A2 (fr) 2002-09-19 2004-04-08 Giesecke & Devrient Gmbh Papier de securite
WO2006066431A1 (fr) 2004-12-23 2006-06-29 Landqart Structure multicouche servant de substrat d'impression et procede de fabrication
WO2014108303A1 (fr) * 2013-01-09 2014-07-17 Sicpa Holding Sa Couches à effet optique présentant un effet optique dépendant de l'angle de vision, procédés et dispositifs pour leur production, articles comportant une couche à effet optique et leurs utilisations
WO2016083259A1 (fr) * 2014-11-27 2016-06-02 Sicpa Holding Sa Dispositifs et procédés d'orientation de particules de pigment magnétiques ou magnétisables en forme de plaquette

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Publication number Publication date
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