EP1491357A2 - Support d'impression avec une couche optique birefringent - Google Patents

Support d'impression avec une couche optique birefringent Download PDF

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Publication number
EP1491357A2
EP1491357A2 EP04009617A EP04009617A EP1491357A2 EP 1491357 A2 EP1491357 A2 EP 1491357A2 EP 04009617 A EP04009617 A EP 04009617A EP 04009617 A EP04009617 A EP 04009617A EP 1491357 A2 EP1491357 A2 EP 1491357A2
Authority
EP
European Patent Office
Prior art keywords
layer
print carrier
embossing
anisotropic layer
printing
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Withdrawn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
EP04009617A
Other languages
German (de)
English (en)
Other versions
EP1491357A3 (fr
Inventor
Peter Dipl.-Phys. Schmitt
Siegfried Dr. Schmitzer
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.)
KBA Metronic GmbH
Original Assignee
KBA Metronic 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 KBA Metronic GmbH filed Critical KBA Metronic GmbH
Publication of EP1491357A2 publication Critical patent/EP1491357A2/fr
Publication of EP1491357A3 publication Critical patent/EP1491357A3/fr
Withdrawn legal-status Critical Current

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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
    • B42D25/364—Liquid crystals
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/26—Entrance cards; Admission tickets
    • B42D2033/26—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612—Composite web or sheet

Definitions

  • the invention relates to a print carrier, in particular labels, labels, information or data carriers, admission tickets, prepaid cards etc. and a method for producing such a print carrier.
  • print media e.g. to secure and authenticate any goods, e.g. Software products, money cards etc.
  • embossing prints also in the form of blind embossing or in connection with embossing holograms, which are difficult to forge.
  • the published patent application DE 198 45552 A1 describes a data carrier, such as securities, banknotes, identity cards or the like, which is provided with an embossing in a predetermined area. At least part of the embossing is in the form of an inclined plane.
  • the embossed area of the data carrier is additionally provided with at least one color layer or a color layer sequence, the optical impression of which varies depending on the viewing angle due to the inclined plane, in order to make embossing more perceptible to a viewer depending on the viewing angle.
  • the print carriers known in the prior art all have the disadvantage that the securing of a product can be recognized immediately with the naked eye, since the print carrier stands out conspicuously from the background, or an embossment in the print carrier strikingly stands out from the rest of the print carrier. A counterfeiter is therefore always aware that to counterfeit the product, he must always also counterfeit the specific print medium. Counterfeiting of such print media can be carried out so professionally that it is sometimes difficult for both laypersons and experts to distinguish counterfeit products from original products.
  • the invention has for its object to provide a print carrier and a method for producing such that when viewed with the naked eye shows no distinguishable areas or a security print is not recognizable when viewed simply, so that e.g. a product backup with such a print carrier is inconspicuous. Due to the fact that product security with such a print carrier is not clearly recognizable, counterfeiting is made considerably more difficult for a counterfeiter and, at the same time, it is immediately and easily possible to identify a counterfeit without the inventive feature.
  • the print carrier is at least partially provided with a transparent, anisotropic layer, in particular optically colorless birefringent layer, in particular which is applied to a layer-oriented structure.
  • Such a print carrier can be produced by using an anisotropic layer, in particular a birefringent layer of e.g. nematogenic liquid crystals, is applied to at least a partial area of the print carrier which has at least one layer-orientating structure.
  • anisotropic layer in particular a birefringent layer of e.g. nematogenic liquid crystals
  • Smectic and chiral nematic liquid crystals can also be used.
  • printing or embossing is carried out by the inventive method
  • the method is not highlighted and cannot be recognized with the naked eye, or cannot be easily recognized, since the anisotropic layer is transparent, preferably colorless, and therefore the visual impression is essentially given by the printing medium which shines through the layer, i.e. through its color or structural appearance.
  • a print which is also to be understood as an embossing which, without optical aids in particular, is in no way distinguishable from blind embossing or embossing on the basis of commercially available, optically isotropic clear lacquers.
  • hidden information can be integrated or displayed in the print, which results from optically recognizable differences between an anisotropic layer and other areas or also from differences within the anisotropic layer.
  • the invention can e.g. when printing security documents such as B. banknotes, securities, credit cards and ID cards are used.
  • security documents such as B. banknotes, securities, credit cards and ID cards are used.
  • the print carrier itself can already be the product to be protected, as is the case with banknotes or credit cards, for example, or the print carrier can be applied as an additional security feature, or the print carrier can be attached to or attached to any goods in the form of a so-called security tag.
  • the transparent anisotropic layer has, for example, optical polarization-dependent effects which, for example, cannot be perceived by the eye, but which can be detected by aids, for example in the case of a birefringent property, by means of polarization filters of a linear or circular type, in particular visible to the eye of an observer with such an aid can be made.
  • liquid crystals e.g. Nematic liquid crystals are used, or varnishes or the like, which contain such liquid crystals and form such a liquid crystal film on a print carrier when printing or embossing.
  • Such radiation-curable liquid-crystalline mixtures are produced, for example, by Merck KGaA. These mixtures are practically invisible after they have been applied to the print carrier, but they show on a suitable surface, e.g. a reflective print carrier and with the help of linear or circular polarizers pronounced visual optical effects.
  • Such a liquid crystal layer can e.g. be applied by means of an embossing print to a preferably high-gloss, metallic printing medium, the resulting, e.g. nematic films with appropriate procedures, e.g. B can be permanently fixed by irradiation with UV light.
  • these embossed prints do not differ in any way from corresponding blind embossings or those embossed prints that have been applied using commercially available clear coats. They therefore have the usual three-dimensional optical impressions caused by light and shadow effects, but do not allow the embossing to emerge more visually in any way, i.e. not by creating an additional contrast or viewing angle-dependent color effect. A purely tactile distinction is also not possible.
  • the differences in appearance can be detected not only with the eye of an observer, but also by machine, e.g. by means of detectors for different polarization directions of the reflected light, so that an automatic test of a print carrier according to the invention is also possible.
  • the reason for this behavior of the liquid crystal components is their spatial orientation, which in turn is particularly determined by the forces acting during the embossing process, in particular shear forces, and also by the respective fine structures of the printing medium or embossing tools.
  • embossed print image If you divide an embossed print image into different, spatially separated (partial) areas, and when creating the embossed print image, orienting forces are used in the individual areas that differ in their directions, or are individual, defined areas of the print carrier or the Stamping tools structured in different directions result in an embossed printed image, the areas of which are distinguished by different optical effects when viewed through a polarizer.
  • the embossed prints according to the invention are particularly suitable for appearing unobtrusively to the naked eye in the presence of blind embossing and embossing based on commercially available clearcoats. In fact, however, they represent optical information which, with the help of e.g. of a polarizer can be made visible or detectable. This allows the invention in security printing from z. B. use securities, banknotes and credit cards or to increase the security against counterfeiting of corresponding documents.
  • a print carrier according to the invention is therefore preferred in addition to at least one partial area with an anisotropic layer and also at least one partial area with a Include blind embossing and / or an uncoated relief and / or at least a partial area with a commercially available, optically isotropic clear lacquer.
  • the printing or embossing structures according to the invention can be particularly easily e.g. using a modified flexographic printing process.
  • z. B. unrolling a hard cliché e.g. with a Shore hardness D of approx. 60 ° - 70 ° over the preferably reflective, permanently deformable printing medium or substrate, whereby the impression cylinder with an elastic rubber blanket e.g. Shore hardness A of e.g. approx. 50 ° - 60 ° can be equipped.
  • the depth of the embossments is controlled via the level of the contact pressure.
  • B. by varying the plate thicknesses in one and the same print areas of different embossing depth can be obtained.
  • B. isotropic clear coats or the optically birefringent e.g. nematic liquid crystal films are coated.
  • the latter are e.g. B. based on the corresponding nematogenic liquid crystal mixtures, for example from Merck KGaA e.g. are available and e.g. can be used in the form of their melts at about 60-70 ° C or in the form of their solutions in organic solvents.
  • the embossing according to the invention can be produced using any embossing tool.
  • You can e.g. B. raised in intaglio printing the embossed structures are carved into a metal plate by known methods.
  • An electronic method for producing such intaglio printing plates is described, for example, in WO 97/48555.
  • the printing material is pressed into the recesses of the engraved metal plate and thus permanently deformed.
  • these printing plates are used during the Printing process not filled with printing medium, but only used to deform, ie to emboss the printing material.
  • the color impressions are similar when analyzing the embossed image with a circular polarizer.
  • the color impressions change depending on the polarizer position e.g. B. between a shiny gold and a shiny silver blue.
  • cases are also possible in which the colors do not experience a significant change depending on the polarizer position, or cases occur on, where it is not every 45 °, but in particular every 90 ° to only a slight color change between z. B. comes a rather dark and a rather light brown.
  • this (dynamic) color behavior depends on a large number of factors, including, for example, the print carrier properties, the printing process used, the leveling and wetting properties of the liquid crystal paint and the thickness, homogeneity and fine structure of the liquid crystal film produced.
  • the e.g. nematic films are much more reflective when viewed through a circular polarizer than when using a linear polarizer. A variation of the viewing angle has no influence on the color impression obtained.
  • the method is given a special configuration if, for. B. the above-mentioned modified flexographic printing process or similar processes can be used, which in the course of the embossing process with the application of a force, e.g. a shear force is associated with the (nematogenic) liquid crystal films and their embossing tools are structured in such a way that a microscopic orientation of the components of the resulting liquid crystal film in a preferred direction is supported.
  • a force e.g. a shear force is associated with the (nematogenic) liquid crystal films and their embossing tools are structured in such a way that a microscopic orientation of the components of the resulting liquid crystal film in a preferred direction is supported.
  • the printed image is rotated through an angle, preferably by 45 °, after a first embossing process and then followed by a second embossing process, the viewer reveals a two-color embossed printed image when analyzed with a linear or circular polarizer.
  • Multi-colored embossing is possible by taking advantage of the entire range between the possible color impressions.
  • the contact pressures and thus the embossing depths can also be made arbitrarily small, so that although no embossed structures can be seen with the naked eye, an orientation of the liquid crystals is nevertheless produced, which means that when using a polarizer, at least corresponding color impressions occur.
  • an anisotropic layer in particular a birefringent layer of e.g. nematogenic liquid crystals, is applied to at least a partial area of a print carrier which has at least one layer-orientating structure.
  • a force can act on the liquid crystals of an anisotropic liquid crystal layer in at least one direction, which causes alignment of the liquid crystals, in particular along the force acting in each case.
  • One or more of such structures can be applied to an area of a print carrier to be printed before or during the printing of the anisotropic layer.
  • Print carriers that are used here can therefore already be supplied with such a structure or are only provided with such a structure in the printing press, e.g. during the application of the printing medium.
  • a print carrier can thus be provided with a mechanical structure and / or an electrostatic structure or charge distribution. Separate orientation layers can also be applied in front of the liquid crystal layer. Changes or targeted orientations of the crystal orientation can also be done by locally heating the applied liquid crystal layer or by local application of electrical and / or magnetic fields.
  • FIGS. 1a, 1b, 1c and 2a, 2b, 2c are not to scale, only reproduce the color impressions schematically and only serve to illustrate the invention.
  • FIG. 1a shows a schematic representation of an embossing according to the invention on a silver-colored, high-gloss printing medium, and the perceived, simplified representation of the color impression without optical aids. Essentially only the embossed structure can be seen, but no color differences between the areas BP of blind embossing without any lacquer layer, P + LC of embossing with liquid crystal (Liquid Crystal) layer, P + KL of embossing with isotropic clear lacquer and the non-embossed area LC which has only one liquid crystal layer.
  • FIG. 1b shows the same embossing according to the invention from FIG. 1a on a silver-colored, high-gloss printing medium, and the perceived, simplified representation of the exemplary color impression when looking through a linear polarizer in the 0 degree position. Due to the crystal orientation, both the embossed area P + LC and the unembossed area LC now appear highlighted in color. This area is bold.
  • 1c shows the same embossing 1a according to the invention on a silver-colored, high-gloss printing medium, and the perceived, simplified representation of the color impression when looking through a linear polarizer, now in the 45 degree position.
  • the areas P + LC and the area LC have a different color impression than in FIG. 1b due to the changed polarizer position. This different color impression is represented by the bold dotted lines.
  • FIG. 2a shows an embossing according to the invention on a silver-colored, high-gloss printing medium and the perceived, simplified representation of the color impression without optical aids.
  • KL isotropic clear lacquer without embossing
  • P1 / P2 + LC embssing 1/2 with liquid crystal
  • P + KL embssing with isotropic clear lacquer
  • BP blind embossing without Lacquer
  • LC liquid crystal without embossing
  • FIG. 2b shows the embossing 2a according to the invention on a silver-colored, high-gloss printing medium and the perceived, simplified representation of the exemplary color impression when looking through a linear polarizer in the 0 degree position.
  • the areas KL and P + KL show no change in the color impression, since only isotropic clear lacquer was applied here.
  • the areas P1 + LC and P2 + LC now have two different color impressions, since the embossing in these areas is such that different orientations of the liquid crystals have occurred.
  • the color impression of the area LC can correspond to that of the area P1 + LC.
  • FIG. 2c shows the embossing 2a according to the invention on a silver-colored, high-gloss printing medium, and the perceived, simplified representation of the color impression when looking through a linear polarizer, now in the 45 degree position.
  • the color impression is exactly the opposite of that in FIG. 2b.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Polarising Elements (AREA)
EP04009617A 2003-06-25 2004-04-23 Support d'impression avec une couche optique birefringent Withdrawn EP1491357A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10328744A DE10328744A1 (de) 2003-06-25 2003-06-25 Druckträger mit optisch doppelbrechender Schicht
DE10328744 2003-06-25

Publications (2)

Publication Number Publication Date
EP1491357A2 true EP1491357A2 (fr) 2004-12-29
EP1491357A3 EP1491357A3 (fr) 2005-09-07

Family

ID=33394994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04009617A Withdrawn EP1491357A3 (fr) 2003-06-25 2004-04-23 Support d'impression avec une couche optique birefringent

Country Status (7)

Country Link
US (2) US20050037179A1 (fr)
EP (1) EP1491357A3 (fr)
JP (1) JP2005014613A (fr)
CN (1) CN1576055A (fr)
CA (1) CA2470288A1 (fr)
DE (1) DE10328744A1 (fr)
RU (1) RU2345899C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185872A1 (fr) * 2012-06-12 2013-12-19 Merck Patent Gmbh Procédé de réalisation de motifs macroscopiques en trois dimensions dans des revêtements à cristaux liquides

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004018702B4 (de) 2004-04-17 2006-05-24 Leonhard Kurz Gmbh & Co. Kg Folie mit Polymerschicht
JP5380791B2 (ja) * 2007-06-11 2014-01-08 凸版印刷株式会社 光学素子、ラベル付き物品、光学キット及び判別方法
UA84687U (en) * 2013-05-16 2013-10-25 Общество С Ограниченной Ответственностью «Специализированное Предприятие «Голография» Security element
GB2550757A (en) * 2015-03-06 2017-11-29 Ccl Secure Pty Ltd A hidden image security device and method
CN104890426A (zh) * 2015-06-29 2015-09-09 福建省诺希科技园发展有限公司 一种压纹玻璃的制作方法及其制品
CN115119432A (zh) * 2021-03-18 2022-09-27 Oppo广东移动通信有限公司 壳体及其制作方法、电子设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199744A (en) * 1988-09-09 1993-04-06 De La Rue Plc Security device
US5772248A (en) * 1995-12-07 1998-06-30 Verify First Technologies, Inc. Document with tamper and counterfeit resistant relief markings
DE19845552A1 (de) * 1998-10-02 2000-04-06 Giesecke & Devrient Gmbh Datenträger

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GB2268906A (en) * 1992-07-24 1994-01-26 Portals Ltd Counterfeit protection for documents using optical effects of liquid crystal
EP0689084B1 (fr) * 1994-06-24 2003-06-04 Rolic AG Composant optique comprenant des couches en monomères liquides cristallins réticulés et procédé de sa production
DE19544130A1 (de) * 1995-11-27 1997-05-28 Giesecke & Devrient Gmbh Datenträger mit optisch variabler Farbe
AUPO289296A0 (en) * 1996-10-10 1996-10-31 Securency Pty Ltd Self-verifying security documents
GB2328180B (en) * 1997-08-14 2001-08-01 Thomas De La Rue Ltd Security device
DE19737612A1 (de) * 1997-08-28 1999-03-04 Consortium Elektrochem Ind Mit dem Auge nicht erkennbare, maschinendetektierbare Sicherheitsmarkierung, Herstellung der Sicherheitsmarkierung und Sicherheitssystem umfassend diese Sicherheitsmarkierung
US6124970A (en) * 1997-10-20 2000-09-26 Latents Image Technology Ltd. Polymer materials with latent images visible in polarized light and methods for their production
US6045894A (en) * 1998-01-13 2000-04-04 3M Innovative Properties Company Clear to colored security film
DE19845440A1 (de) * 1998-10-02 2000-04-06 Giesecke & Devrient Gmbh Stichtiefdruckverfahren zum vollflächigen Bedrucken großer Flächen
WO2000072056A1 (fr) * 1999-05-24 2000-11-30 Toppan Printing Co., Ltd. Corps composite stratifie, support d'enregistrement d'informations et element permettant d'attribuer une fonction de prevention des contrefaçons
EP1120737A1 (fr) * 2000-01-27 2001-08-01 Rolic AG Dispositif optique de sécurité
EP1681586A1 (fr) * 2001-04-24 2006-07-19 Merck Patent GmbH Marque biréfringente
JP2003145912A (ja) * 2001-11-15 2003-05-21 Toppan Printing Co Ltd 偽造防止印刷物
EP2209027A1 (fr) * 2002-02-13 2010-07-21 MERCK PATENT GmbH Marquage de sécurité comprenant un film polymère anisotropique sur un substrat avec une surface structurée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199744A (en) * 1988-09-09 1993-04-06 De La Rue Plc Security device
US5772248A (en) * 1995-12-07 1998-06-30 Verify First Technologies, Inc. Document with tamper and counterfeit resistant relief markings
DE19845552A1 (de) * 1998-10-02 2000-04-06 Giesecke & Devrient Gmbh Datenträger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185872A1 (fr) * 2012-06-12 2013-12-19 Merck Patent Gmbh Procédé de réalisation de motifs macroscopiques en trois dimensions dans des revêtements à cristaux liquides
US9796209B2 (en) 2012-06-12 2017-10-24 Merck Patent Gmbh Process for producing three-dimensional patterns in liquid-crystalline coatings

Also Published As

Publication number Publication date
JP2005014613A (ja) 2005-01-20
EP1491357A3 (fr) 2005-09-07
US20050037179A1 (en) 2005-02-17
RU2004119365A (ru) 2005-12-10
CA2470288A1 (fr) 2004-12-25
US20060292348A1 (en) 2006-12-28
DE10328744A1 (de) 2005-01-13
CN1576055A (zh) 2005-02-09
RU2345899C2 (ru) 2009-02-10

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