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EP1458836A1 - Liquide et procede d'impression de securite utilisant des nanoparticules - Google Patents

Liquide et procede d'impression de securite utilisant des nanoparticules

Info

Publication number
EP1458836A1
EP1458836A1 EP02804851A EP02804851A EP1458836A1 EP 1458836 A1 EP1458836 A1 EP 1458836A1 EP 02804851 A EP02804851 A EP 02804851A EP 02804851 A EP02804851 A EP 02804851A EP 1458836 A1 EP1458836 A1 EP 1458836A1
Authority
EP
European Patent Office
Prior art keywords
printing
nanoparticles
pressure fluid
nozzles
narrow
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Withdrawn
Application number
EP02804851A
Other languages
German (de)
English (en)
Inventor
Stephan Haubold
Fernando Ibarra
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.)
Centrum fuer Angewandte Nanotechnologie CAN GmbH
Original Assignee
Nanosolutions 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 Nanosolutions GmbH filed Critical Nanosolutions GmbH
Publication of EP1458836A1 publication Critical patent/EP1458836A1/fr
Withdrawn legal-status Critical Current

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
    • B42D25/373—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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks

Definitions

  • the invention is based on a printing process which ejects printing liquid through one or more narrow nozzles during the printing process, or a printing liquid suitable for such a process.
  • a nozzle opening diameter of a few micrometers means narrow.
  • the invention relates in particular to the aspect of security against forgery of prints.
  • a well-known method of protection against counterfeiting is the use of graphic security features, which are not perceptible to the naked eye due to their inconspicuousness or microstructure.
  • graphic security features which are not perceptible to the naked eye due to their inconspicuousness or microstructure.
  • very small structures with particularly fine lines of up to 5 micrometers in width can be printed with the method disclosed in the patent DE 197 54 776 A1.
  • Eye can not be recognized, such as through change the shape, density, position or size of the pixels.
  • the printing fluid according to the invention contains nanoparticles that can be excited for fluorescence or phosphorescence
  • Wording particles are in the order of 1 to 1000 nanometers in diameter and have a crystal structure. With such small particles there is no risk of clogging the narrow nozzles used in the printing process, in particular if they have smaller average diameters than 300 nanometers.
  • the use of printing fluids with such nanoparticles is a simple method of increasing the security against forgery of prints, in particular because such crystalline solids that can be excited to fluorescence or phosphorescence have a sufficiently clear demarcation of the absorbable and emitted radiation frequencies for an improved counterfeit security identification.
  • the nanoparticles can preferably be excited with UV-A, UV-B, or UV-C radiation, or with visual light.
  • the present invention provides an improvement in security in product protection by marking objects by means of printing fluid containing, in particular ink-jet printable, nanoparticles.
  • the detection of such a method should preferably be extremely simple and involve little outlay on equipment.
  • a security feature could be built into a print that is only visible under a UV-C (255 nm) lamp, but is not visible under a UV-B (366 nm) lamp.
  • the security of the marking is guaranteed by the size and the physical characteristics of the nanoparticles and by the use of the same in an ink in a multi-color printing process of an inkjet printer.
  • the present invention is therefore particularly suitable for introducing fluorescent or phosphorescent nanoparticle substances into liquids suitable for printing as a carrier medium, for mixing the latter well therein, and thus for carrying out a printing process according to the prior art in a form modified according to the invention, or for carrying out the printing process still To further improve the manufacture of printed security markings, as described above.
  • nanoparticles can be used whose synthesis is disclosed in the copending patent application PCT / DE 01/03433.
  • One or more dopants can then be specifically selected so that the desired absorption and emission properties can be achieved.
  • inventive method in the form when nanoparticles are added to one or more color liquids can of course also be used to achieve “simple” special fluorescence effects. These are understood to be essentially all those effects which are due to an uncomplicatedly perceptible fluorescence - Emission occurs, namely after excitation with radiation from a customary and easily producible, also broader spectral range, such as visual light, or UV-A. In this case, the lighting effect should be perceived easily and without any further technical aids then such nanoparticles, especially containing phosphorus or fluorine, without appropriate safety doping.
  • the security aspect of the printing methods of the present invention then essentially comes about by adding one or more dopants, i.e. be incorporated into the host material of the nanoparticles, at least one of which after appropriate excitation, e.g. causes an emission by UV-C light, which can then be detected.
  • This principle is therefore based on wavelength-specific energy absorption and on wavelength-specific emission of detection radiation.
  • the crystal lattice or, in the case of doping, the host lattice can contain, in general terms, compounds of the type XY, where X is a cation from one or more elements of the main groups la, 2a, 3a, 4a, the subgroups 2b, 3b, 4b, 5b , 6b, 7b or the lanthanides (rare earth element group) of the periodic table, and Y is either a polyatomic anion from one or more elements of main groups 3a, 4a, 5a, subgroups 3b, 4b, 5b, 6b, 7b, and or 8b and elements of main groups 6a, and or 7, or a monatomic anion from main group 5a, 6a or 7a of the periodic table.
  • X is a cation from one or more elements of the main groups la, 2a, 3a, 4a, the subgroups 2b, 3b, 4b, 5b , 6b, 7b or the lanthanides (rare earth element group) of the
  • phosphates halophosphates, arsenates, sulfates, borates, aluminates, gallates, silicates, germanates, 0- xides, vanadates, niobates, tantalates, tungstates, molybdates, alkali halates, other halides, nitrides, sulfides, selenides, sulfoselenides, or the oxysulfides.
  • one or more elements from a quantity containing elements of the main groups la, 2a or Al, Cr, Tl, Mn, Ag, Cu, As, Nb, Ni, Ti, In, Sb, Ga, Si, Pb, Bi, Zn, Co and / or elements of the lanthanides can be used.
  • nanoparticles with one of the following compounds can be used for labeling.
  • Ca (F, Cl) 2 Sb, Mn; CaSi0 3 : Mn, Pb; Ca 2 Al 2 Si 2 0 7 : Ce; (Ca, Mg) Si0 3 : Ce; (Ca, Mg) Si0 3 : Ti; 2Sr0.6 (B 2 0 3 ) .SrF 2 : Eu; 3Sr 3 (P0 4 ) 2 . CaCl 2 : Eu; A 3 (P0 4 ) 2 .
  • A lanthanide, In
  • Y (P, V) 0 4 Eu
  • YTa0 4 Nb
  • GdMgB 5 O ⁇ 0 Ce, Tb; LaOBrTb; La 2 0 2 S: Tb; LaF 3 : Nd, Ce; BaYb 2 F 8 : Eu;
  • NaYF 4 Yb, Er
  • NaGdF 4 Yb, Er
  • NaLaF 4 Yb, Er
  • LaF 3 Yb, Er, Tm
  • nanoparticles with one of the following compounds can be used according to the invention: YV0 4 : Eu; YV0 4 : Sm; YV0 4 : Dy; LaP0 4 : Eu; LaP0 4 : Ce; LaP0 4 : Ce, Tb; ZnS: Tb; ZnS: TbF 3 ; ZnS: Eu; ZnS: EuF 3 ; Y 2 0 3 : Eu; Y 2 0 2 S: Eu; Y 2 Si0 5 : Eu; Si0 2 : Dy; Si0 2 : Al; Y 2 0 3 : Tb; CdS: Mn; ZnS: Tb; ZnS: Ag; ZnS: Cu; Ca 3 (P0 4 ) 2 : Eu 2+ ; Ca 3 (P0 4 ) 2 : Eu 2+ , Mn 2+ ; Sr 2 Si0 4 : Eu 2+ ;
  • two elements can also advantageously contain one another in predetermined relative concentrations, one doping element having a local maximum of the absorption spectrum for light, in particular UV light, and the other doping element having a fluorescence emission spectrum which has at least one local maximum, which has a distance ⁇ / ⁇ from the absorption maximum of the first doping element of at least 4%.
  • the above-mentioned lanthanum phosphate with doping from cerium and terbium is an example of this, one dopant acting as an energy absorber, in particular as a UV light absorber and the other as a fluorescent light emitter.
  • a difficult authenticity check and thus increased security against forgery is given with a doping that only emits when it has been excited with a very specific, narrow-band radiation.
  • the emission can additionally can only be recognized with technical aids, eg UV emission or IR emission.
  • a printing method according to the invention can also be achieved by admixing the nanoparticles with one or more or all of the printing inks used.
  • the red color component could be provided with a corresponding fluorescent nanoparticle admixture. The higher the proportion of fluorescent nanoparticles in the total volume, the more intense the fluorescence and thus the easier it is to determine the emission light.
  • a pixel could not be produced from three individual dots of different colors, as is customary in pixel-based color printing processes, but from several, for example four or five or a higher number.
  • Special print heads can also be built in a further advantageous manner for the production of high-security markings which have a secret arrangement pattern of pixel arrangements.
  • the arrangement pattern includes, for example, a range of 40 x 40 dots. For example, it can be repeated or modified according to a predetermined code - a secret rule - in order to further increase the security against forgery.
  • a further development of the printing process according to the invention in which the pressure fluid (s) is sprayed out through a plurality of narrow nozzles, is the possibility of controlling individual nozzles or subsets of the nozzles with regard to the duration or intensity of the flow of the pressure fluid.
  • the flow of the ink can be increased by increasing the electrical control voltage at an individually controlled nozzle of a piezo print head.
  • the corresponding pixel point can be displayed in bold in a secret arrangement pattern, which is another possible variation for a Si represents security marking and thus increases protection against counterfeiting.
  • FIG. 2 schematically shows an example of a secret arrangement pattern of pixel arrangements that were printed according to a further embodiment of the method according to the invention.
  • Fig. 1 shows an example to be understood only schematically, where a left side shows an obliquely upward line and a vertical line is shown in sections.
  • the fully drawn points 10 and 12 - left 1 of 3, right 1 of 4, should each consist of such ink Storage containers are generated, which are enriched with the possibly secret fluorescent nanoparticles.
  • These nanoparticles are small crystalline particles that can be excited to fluorescence or phosphorescence either by themselves or with dopants.
  • Individual dots 10, 12 can be printed with printing fluid containing nanoparticles coming from a special container. Because of their small size of 1 to 1000 nanometers, preferably in the range of 300 nanometers in diameter or very much smaller - depending on the nozzle diameter, there is no risk of clogging very narrow ink jet nozzles.
  • FIG. 2 An example of a secret arrangement pattern of pixel arrangements of a special printhead, such as a printhead of a piezo printing method, is shown in FIG. 2.
  • the arrangement pattern covers a range of 40 x 40 dots in this example. For example, it can also be repeated or specifically modified according to a predetermined code - a secret rule - in order to further increase the security against forgery.
  • Each individual point of the arrangement pattern should now correspond to a 3 or 4 pixel, as shown in FIG. 1.
  • the pattern can then be repeatedly present in a printhead repeatedly, if necessary.
  • Examples of difficult counterfeiting of the marking are: a print head suitable for printing fluids containing nanoparticles, for example for a piezo printing process, or an inkjet process based on the thermobased bubble jet principle, which carries a secret, difficult to forge and difficult to recognize pixel arrangement pattern, or: The doping of an ink component is selected so that the corresponding nanoparticles are difficult to use
  • An example of easy recognizability, ie verifiability of the authenticity of the marking, is: the emission of the nanoparticles is easily recognizable even for the layperson, for example the cashier in the case of a banknote. This makes it possible to make a contribution to making banknotes and other printable security objects more counterfeit-proof, and depending on the endowment, the detection of a counterfeit can be proven with relatively simple means.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Ink Jet (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Printing Methods (AREA)

Abstract

L'invention concerne un procédé d'impression selon lequel, pendant l'opération d'impression, un liquide d'impression jaillit par une buse étroite, et un liquide d'impression adapté à un tel procédé. L'invention concerne notamment une impression infalsifiable sur des papiers ou objets. Ce procédé d'impression et ce liquide d'impression sont caractérisés en ce que le liquide d'impression contient des nanoparticules excitables pour émettre la fluorescence ou la phosphorescence. Ces nanoparticules sont de petites particules cristallines qui peuvent, automatiquement ou lorsqu'elles sont mélangées à des dopants, émettre une fluorescence ou phosphorescence. Certains points (10, 12) peuvent être imprimés par un liquide d'impression contenant ces nanoparticules. En raison de leur petite taille de 1 à 1000 nanomètres, de préférence de l'ordre de 300 nanomètres ou beaucoup plus petit, en fonction du diamètre de buse, il y a risque d'obturation des buses à jets d'encre très étroites. Les plages de fréquences d'émission d'excitation et de fluorescence sont à bande étroite de telle manière que, pour une commande de sécurité de l'impression, l'excitation ou la détection spécifique aux longueurs d'ondes correspondante est nécessaire. La sécurité contre la falsification est ainsi accrue.
EP02804851A 2001-12-18 2002-12-16 Liquide et procede d'impression de securite utilisant des nanoparticules Withdrawn EP1458836A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10162329 2001-12-18
DE10162329 2001-12-18
PCT/DE2002/004575 WO2003052025A1 (fr) 2001-12-18 2002-12-16 Liquide et procede d'impression de securite utilisant des nanoparticules

Publications (1)

Publication Number Publication Date
EP1458836A1 true EP1458836A1 (fr) 2004-09-22

Family

ID=7709763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02804851A Withdrawn EP1458836A1 (fr) 2001-12-18 2002-12-16 Liquide et procede d'impression de securite utilisant des nanoparticules

Country Status (9)

Country Link
US (1) US7699456B2 (fr)
EP (1) EP1458836A1 (fr)
JP (1) JP2005513198A (fr)
CN (1) CN1306001C (fr)
AU (2) AU2002366254A1 (fr)
CA (1) CA2468604C (fr)
IL (1) IL162209A0 (fr)
RU (1) RU2312882C2 (fr)
WO (2) WO2003051643A1 (fr)

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AU2002366254A1 (en) 2003-06-30
CA2468604A1 (fr) 2003-06-26
US7699456B2 (en) 2010-04-20
WO2003052025A1 (fr) 2003-06-26
IL162209A0 (en) 2005-11-20
US20050068395A1 (en) 2005-03-31
WO2003051643A1 (fr) 2003-06-26
AU2002366253A1 (en) 2003-06-30
RU2312882C2 (ru) 2007-12-20
JP2005513198A (ja) 2005-05-12
CN1604951A (zh) 2005-04-06
RU2004121953A (ru) 2006-01-20
CA2468604C (fr) 2011-05-31
CN1306001C (zh) 2007-03-21
AU2002366253B2 (en) 2007-06-14

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