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EP0303725B1 - Security paper - Google Patents

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Publication number
EP0303725B1
EP0303725B1 EP87112042A EP87112042A EP0303725B1 EP 0303725 B1 EP0303725 B1 EP 0303725B1 EP 87112042 A EP87112042 A EP 87112042A EP 87112042 A EP87112042 A EP 87112042A EP 0303725 B1 EP0303725 B1 EP 0303725B1
Authority
EP
European Patent Office
Prior art keywords
colors
color
security paper
paper according
portions
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.)
Expired - Lifetime
Application number
EP87112042A
Other languages
German (de)
French (fr)
Other versions
EP0303725A1 (en
Inventor
Michael Dipl.-Ing. Böhm
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.)
GAO Gesellschaft fuer Automation und Organisation mbH
Original Assignee
GAO Gesellschaft fuer Automation und Organisation mbH
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
Priority to DE8787112042T priority Critical patent/DE3779918D1/en
Application filed by GAO Gesellschaft fuer Automation und Organisation mbH filed Critical GAO Gesellschaft fuer Automation und Organisation mbH
Priority to EP87112042A priority patent/EP0303725B1/en
Priority to AT87112042T priority patent/ATE77427T1/en
Priority to ES198787112042T priority patent/ES2032787T3/en
Priority to US07/228,896 priority patent/US4897300A/en
Priority to FI883737A priority patent/FI89251C/en
Priority to KR1019880010353A priority patent/KR960015820B1/en
Publication of EP0303725A1 publication Critical patent/EP0303725A1/en
Application granted granted Critical
Publication of EP0303725B1 publication Critical patent/EP0303725B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42—Ribbons or strips
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • 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
    • 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
    • B42D25/355—Security threads
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48—Elements suited for physical verification, e.g. by irradiation
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S283/00—Printed matter
    • Y10S283/904—Credit card
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/908—Impression retention layer, e.g. print matrix, sound record
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania
    • Y10S428/915—Fraud or tamper detecting
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/916—Fraud or tamper detecting
    • 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.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • 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
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core

Definitions

  • the invention relates to a security paper, in particular bank note, with a security thread running from edge to edge and embedded in the security paper, on which luminescent colors are applied.
  • DE-A 14 46 851 describes a security thread which has a microprint executed in several colors.
  • the inks can also be fluorescent.
  • the areas printed with different colors can be so small or printed so closely together that they can no longer be resolved with the naked eye or the viewer is given a uniform color impression. Only with a magnifying glass or a microscope can the microprint or the different colors be recognized.
  • a disadvantage of this known security thread is that the authenticity markings are either relatively difficult to identify for the layperson or that a counterfeiter to deceive laypersons only has to imitate the general color impression which is produced by the micro-areas of different colors that can no longer be resolved with the naked eye. Because, as already mentioned, a forgery can only be detected under a magnifying glass or a microscope. In addition, the colored thread can possibly give the aesthetic impression of a printed image interfere, which is particularly disadvantageous for banknotes. On the other hand, if the security thread itself is arranged in the printing area of the banknote, the printed image of the banknote also interferes with the identification of the microprint applied to the security thread. The known thread is therefore not suitable for any arrangement in securities and also not for simple visual authenticity checks.
  • the invention has for its object to provide a security thread for a security or security that is inconspicuous in normal lighting and therefore does not interfere with the appearance of the security, but which nevertheless has a characteristic, easily verifiable identification, based on in a simple manner the authenticity of the security thread and thus the corresponding security can be proven.
  • luminescent colors are used which are not visible under normal lighting and which are provided along the security thread in successive and overlapping sections, which in the excited state of the colors have a length which can be seen with the naked eye and which each have different luminescent colors printed or coated in the overlapping areas result in characteristic mixed luminescence.
  • the mixed color that arises in the overlap areas flows smoothly and continuously into the color of the sections each enclosing the overlap area.
  • the desired and achievable effect according to the invention is particularly clear and impressive when the luminescent colors are chosen so that the successive sections with the primary colors the additive color mixture are printed, the respective mixed colors then also resulting in an almost pure form in the overlapping areas.
  • the sections are printed with luminescent colors which emit red, green and / or blue, the overlapping areas appearing orange, green and / or violet.
  • the sequence of colors can in particular be chosen so that the color sequence of the natural spectrum results, so that a kind of rainbow effect occurs.
  • the security thread In addition to the special aesthetic effect of the security thread according to the invention, it also has a high security value, since it is difficult for a counterfeiter to imitate it.
  • the counterfeiter must first analyze several colors and imitate them accordingly.
  • the mixed colors that occur in the overlap areas due to the mixed luminescence present there are extremely difficult to reconstruct, since basic colors with a slightly different emission spectrum already cause a strong shift in the mixed fluorescence.
  • the thread is still light and can be checked for authenticity without difficulty.
  • the corresponding security paper only needs to be exposed to UV radiation.
  • the provision of such a light source at a bank counter and the inconspicuous checking of banknotes is possible without major difficulties. It is even conceivable for this to provide the light source below the table and to carry out the fluorescence excitation through a plate embedded in the table, which is only permeable to ultraviolet light, so that the fluorescence test is less or not noticed by the customer.
  • a cumbersome, time-consuming and, above all, compromising test for the customer by, for example, microscopic inspection, which can hardly be carried out at a bank counter, can be avoided.
  • UV radiation sources are also available as handheld devices, in the manner of a pocket torch, so that the authenticity of the security paper can also be clearly and reliably determined at any location. Also helpful is the fact that the authenticity feature is a memorable and memorable effect, even for lay people.
  • the initially colorless, inconspicuous security thread suddenly receives an intensely colorful color effect when exposed to UV light, the colors following one another, for example, in the order of the natural light spectrum. If the same normal colors are provided near the security thread or from elsewhere in the printed image, which ideally can also be in the same order, a simple direct comparison with the colors of the security thread is also possible. Of course, an automatic test using appropriate detectors is not excluded.
  • Fluorescent substances which are suitable for the printing inks proposed according to the invention are known in principle, even if they are difficult to obtain commercially.
  • DE-B 30 32 611 contains rare earth metal salt phosphors disclosed that emit red and green.
  • EP-A 0 007 383 describes blue-emitting europium-doped phosphors and finally, US Pat. No. 3,525,698 mentions rare earth metal phosphates which emit bright green.
  • suitable phosphors reference is expressly made to the disclosure of the publications mentioned; however, the use of other phosphors is not excluded insofar as they meet the requirements according to the invention.
  • the body color is white or the materials are colorlessly transparent, that the materials have clearly distinguishable fluorescent emissions, which, when mixed, also differ characteristically from one another.
  • Colors which are of high color purity and whose emission spectra correspond as far as possible to the ideal values of the additive color mixture are particularly suitable. It goes without saying that attention should also be paid to resistance to environmental influences. However, the skilled worker is familiar with such aspects.
  • phosphorescent colors can also be used. By printing these colors on top of each other in the overlap area, a change in color can occur due to different long persistence times. This color change would be a further authenticity criterion, which makes counterfeiting even more difficult.
  • Such phosphorescent colors are described, for example, in EP-A 0 003 187. Reference is also expressly made to the disclosure of this publication.
  • Section 1 is printed with a blue-emitting color, for example, area 2 with a red-emitting color.
  • the color in the overlap area would therefore be violet or magenta.
  • red and green are selected for the basic colors of sections 1 and 2
  • the mixed color resulting in the overlap area 3 would be yellow
  • the mixed color in the overlap area 3 would be cyan, d. H. blue green.
  • the overlapping areas have the mixed colors yellow, blue-green (cyan) and violet (magenta).
  • the color order corresponds to the color order that is achieved by prismatic decomposition of white daylight or that occurs in the rainbow. The aesthetic effect of such a thread is particularly impressive.
  • mixed colors can of course also be used. Because of the problems mentioned, the combination of matching mixed colors, which also result in sufficiently pure and characteristic mixed fluorescence in the overlap area, is extremely difficult. However, if such a useful color combination is available, it is practically impossible to reproduce for outsiders and therefore also for counterfeiters.
  • the amount of color can be adjusted accordingly to regulate the luminosity. Since the fluorescence intensity of a printing ink also depends on the amount of ink or layer thickness within certain limits, a higher quantity of color should be selected for less bright colors and vice versa. For an aesthetically appealing impression, it is particularly impressive if all the colors used have approximately the same luminosity. In this case, the counterfeiter also has another hurdle in copying, since it is not so easy to match the intensities to one another or to reproduce the necessary layer thicknesses without appropriate specialist knowledge.
  • the above-mentioned method can be used both for matching of one another in homogeneous color areas and of color areas generated in raster printing technology.
  • the primary colors 1 and 2 are not distributed homogeneously on the support, but only in the form of individual color dots in a grid pattern printed on.
  • the overlapping areas 3 there are color dots of both colors, ie the primary colors 1 and 2, so that, viewed from a distance, the impression of a mixed color is created.
  • the color dots are so small and so close together that they cannot be resolved by the eye individually or with difficulty.
  • the respective density of the color dots in the overlap areas can decrease continuously towards the end of the section according to FIG. 4, while the density of the color dots of the next overlapping section increases continuously from zero to a certain value.
  • the resulting mixed color then does not change abruptly, but continuously and smoothly into the colors of the adjacent sections.
  • the security threads are produced in a known manner, i. H. by printing flat films in strips and then cutting them. Printing the individual threads is also conceivable in principle, but less suitable for large series.
  • the printing technique to be used depends on the carrier materials used and the properties of the printing ink. Screen printing processes are particularly suitable because they allow particularly simple regulation of the amount of ink. However, local multiple overprinting of defined, uniform layer thicknesses is also possible.
  • the paint can be applied by spraying or spraying in a free jet.
  • the layer thicknesses are set by the size of the spray nozzles, the spray duration, multiple spraying, etc.
  • any tear-resistant plastic is suitable as a carrier material for the security thread.
  • the tensile strength is important because the security thread is mechanically stressed when it is stored in the security paper.
  • transparent polyester film has proven itself. If the backing material is transparent, it is not necessary to ensure that the security thread remains in the same orientation during storage, since the colors emitted can also be seen from the back of the security thread through the backing material. If, on the other hand, an opaque backing material is used, care must be taken to ensure that the security thread in the paper remains in the same orientation if the fluorescence effects are to appear on the same page for all securities, otherwise the backing material must be printed on both sides.
  • the security threads can of course also have other characteristic features which are additionally evaluated in an authenticity check. For example, only machine-recognizable features such as a metallic or electrically conductive intermediate layer or magnetic inclusions are possible.
  • the security thread is also embedded in the paper in a known manner, for example by feeding the thread onto the drum of a circular paper machine. It can be useful here if the thread is covered at least on one side only by a relatively thin paper layer, if the color effect is dampened too much by the paper layer. Embedding the thread interrupted by windows is also possible for this. Such a method is described for example in DE-A 36 01 114.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Liquid Crystal Substances (AREA)
  • Fats And Perfumes (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

The security paper has an embedded security thread running from edge to edge, which is printed with luminescent inks in such away that they are not visible under normal lighting. The luminescent inks are provided in successive, overlapping sections along the security thread, which, when the inks are excited, have a length visible to the naked eye and characteristic mixed fluorescence in the overlapping areas. <IMAGE>

Description

Die Erfindung betrifft ein Sicherheitspapier, insbesondere Banknote, mit einem von Kante zu Kante durchlaufenden, in das Sicherheitspapier eingelagerten Sicherheitsfaden, auf dem lumineszierende Farben aufgetragen sind.The invention relates to a security paper, in particular bank note, with a security thread running from edge to edge and embedded in the security paper, on which luminescent colors are applied.

Die Absicherung von Wertpapieren durch Sicherheitsfäden, die während des Herstellungsprozesses in das Papier eingebettet werden, ist seit langem bekannt.Securing securities with security threads that are embedded in the paper during the manufacturing process has long been known.

Natürlich haben sich die Sicherheitsfäden im Laufe der Zeit immer mehr verfeinert. Hierbei sind auch zahlreiche Vorschläge bekannt geworden, Sicherheitsfäden mit bestimmten Eigenschaften auszustatten, so daß nicht nur die Anwesenheit des Sicherheitsfadens allein, sondern auch das Vorhandensein der besonderen Eigenschaften die Echtheit des betreffenden Papiers garantieren soll. So ist beispielsweise in der DE-A 14 46 851 ein Sicherheitsfaden beschrieben, der einen in mehreren Farben ausgeführten Mikrodruck aufweist. Die Druckfarben können auch fluoreszierend sein. Die mit unterschiedlichen Farben bedruckten Bereiche können dabei so klein sein oder so eng nebeneinandergedruckt werden, daß sie mit bloßem Auge nicht mehr aufgelöst werden können oder dem Betrachter ein gleichförmiger Farbeindruck vermittelt wird. Erst mittels einer Lupe oder eines Mikroskopes lassen sich der Mikrodruck oder die unterschiedlichen Farben erkennen.Of course, the security threads have refined more and more over time. Numerous proposals have also become known for providing security threads with certain properties, so that not only the presence of the security thread alone, but also the presence of the special properties should guarantee the authenticity of the paper in question. For example, DE-A 14 46 851 describes a security thread which has a microprint executed in several colors. The inks can also be fluorescent. The areas printed with different colors can be so small or printed so closely together that they can no longer be resolved with the naked eye or the viewer is given a uniform color impression. Only with a magnifying glass or a microscope can the microprint or the different colors be recognized.

Als nachteilig wird bei diesem bekannten Sicherheitsfaden angesehen, daß die Echtheitskennzeichen entweder für den Laien relativ schwer zu identifizieren sind oder aber ein Fälscher zur Täuschung von Laien nur den allgemeinen Farbeindruck nachzuahmen braucht, der durch die mit bloßem Auge nicht mehr auflösbaren Mikrobereiche unterschiedlicher Farbe entsteht, denn eine Fälschung läßt sich, wie schon ausgeführt, nur unter der Lupe oder dem Mikroskop nachweisen. Darüberhinaus kann der bunte Faden gegebenenfalls den ästhetischen Eindruck eines Druckbildes stören, was insbesondere bei Banknoten nachteilig ist. Andererseits stört, wenn der Sicherheitsfaden selbst im Druckbereich der Banknote angeordnet ist, das Druckbild der Banknote auch bei der Identifikation des auf dem Sicherheitsfaden aufgebrachten Mikrodrucks. Der bekannte Faden eignet sich daher nicht zur beliebigen Anordnung in Wertpapier und auch nicht zur einfachen visuellen Echtheitsprüfung.A disadvantage of this known security thread is that the authenticity markings are either relatively difficult to identify for the layperson or that a counterfeiter to deceive laypersons only has to imitate the general color impression which is produced by the micro-areas of different colors that can no longer be resolved with the naked eye. Because, as already mentioned, a forgery can only be detected under a magnifying glass or a microscope. In addition, the colored thread can possibly give the aesthetic impression of a printed image interfere, which is particularly disadvantageous for banknotes. On the other hand, if the security thread itself is arranged in the printing area of the banknote, the printed image of the banknote also interferes with the identification of the microprint applied to the security thread. The known thread is therefore not suitable for any arrangement in securities and also not for simple visual authenticity checks.

Der Erfindung liegt die Aufgabe zugrunde, einen Sicherheitsfaden für ein Sicherheits- bzw. Wertpapier zu schaffen, der bei normaler Beleuchtung unauffällig ist und daher das Erscheinungsbild des Wertpapiers nicht stört, der aber doch eine charakteristische, leicht prüfbare Kennzeichnung aufweist, anhand der in einfacher Weise die Echtheit des Sicherheitsfadens und damit des entsprechenden Wertpapiers nachweisbar ist.The invention has for its object to provide a security thread for a security or security that is inconspicuous in normal lighting and therefore does not interfere with the appearance of the security, but which nevertheless has a characteristic, easily verifiable identification, based on in a simple manner the authenticity of the security thread and thus the corresponding security can be proven.

Gelöst wird diese Aufgabe dadurch, daß lumineszierende Farben verwendet werden, die bei normaler Beleuchtung nicht sichtbar sind und die längs des Sicherheitsfadens in aufeinanderfolgenden und sich überlappenden Abschnitten vorgesehen sind, die im angeregten Zustand der Farben eine mit bloßem Auge erkennbare Länge besitzen und die jeweils mit unterschiedlichen lumineszierenden Farben bedruckt oder beschichtet in den Überlappungsbereichen charakteristische Mischlumineszenzen ergeben.This object is achieved in that luminescent colors are used which are not visible under normal lighting and which are provided along the security thread in successive and overlapping sections, which in the excited state of the colors have a length which can be seen with the naked eye and which each have different luminescent colors printed or coated in the overlapping areas result in characteristic mixed luminescence.

Vorzugsweise geht die Mischfarbe, die sich in den Überlappungsbereichen einstellt, fließend und kontinuierlich in die Farbe der den Überlappungsbereich jeweils einschließenden Abschnitte über.Preferably, the mixed color that arises in the overlap areas flows smoothly and continuously into the color of the sections each enclosing the overlap area.

Der erfindungsgemäß erreichbare und gewünschte Effekt stellt sich besonders deutlich und eindrucksvoll dann ein, wenn die lumineszierenden Farben so gewählt werden, daß die aufeinanderfolgenden Abschnitte mit den Grundfarben der additiven Farbmischung bedruckt werden, wobei sich in den Überlappungsbereichen dann die jeweiligen Mischfarben in ebenfalls nahezu reiner Form ergeben. Beispielsweise werden die Abschnitte mit lumineszierenden Farben bedruckt, die rot, grün und/oder blau emittieren, wobei die Überlappungsbereiche orange, grün und/oder violett erscheinen. Die Aufeinanderfolge der Farben kann insbesondere so gewählt werden, daß sich die Farbreihenfolge des natürlichen Spektrums ergibt, so daß eine Art Regenbogen-Effekt auftritt.The desired and achievable effect according to the invention is particularly clear and impressive when the luminescent colors are chosen so that the successive sections with the primary colors the additive color mixture are printed, the respective mixed colors then also resulting in an almost pure form in the overlapping areas. For example, the sections are printed with luminescent colors which emit red, green and / or blue, the overlapping areas appearing orange, green and / or violet. The sequence of colors can in particular be chosen so that the color sequence of the natural spectrum results, so that a kind of rainbow effect occurs.

Abgesehen von der besonderen ästhetischen Wirkung des erfindungsgemäßen Sicherheitsfadens hat dieser auch einen hohen Sicherheitswert, da er von einem Fälscher nur schwer nachgeahmt werden kann. Der Fälscher muß zunächst mehrere Farben analysieren und entsprechend nachahmen. Die Mischfarben, die in den Überlappungsbereichen durch die dort vorhandene Mischlumineszenz auftreten, sind äußerst schwer zu rekonstruieren, da Grundfarben mit einem nur leicht abweichenden Emissionsspektrum bereits eine starke Verschiebung der Mischfluoreszenz bewirken. Wegen der neutralen Farbe im nicht angeregten Zustand und der erforderlichen hohen Leuchtkraft im angeregten Zustand sind nur identische Lumineszenzfarben geeignet. Derartige Farben finden üblicherweise aber keine Verwendung und sind deshalb auf dem Markt praktisch nicht erhältlich, sondern müssen speziell hergestellt werden. Insgesamt sieht sich der Fälscher bei einer versuchten Nachbildung des Sicherheitsfadens deshalb mit einer Reihe von schwer zu überwindenden physikalischen und technischen Problemen konfrontiert, die eine Nachahmung oder Fälschung nahezu unmöglich machen.In addition to the special aesthetic effect of the security thread according to the invention, it also has a high security value, since it is difficult for a counterfeiter to imitate it. The counterfeiter must first analyze several colors and imitate them accordingly. The mixed colors that occur in the overlap areas due to the mixed luminescence present there are extremely difficult to reconstruct, since basic colors with a slightly different emission spectrum already cause a strong shift in the mixed fluorescence. Because of the neutral color in the non-excited state and the required high luminosity in the excited state, only identical luminescent colors are suitable. Such colors are usually not used and are therefore practically not available on the market, but must be specially manufactured. Overall, the counterfeiter is therefore faced with a number of difficult to overcome physical and technical problems when trying to replicate the security thread, which make imitation or counterfeiting almost impossible.

Abgesehen von dem hohen Sicherheitsstandard ist der Faden trotzdem leicht und ohne Schwierigkeiten auf seine Echtheit überprüfbar. Das entsprechende Sicherheitspapier braucht lediglich einer UV-Bestrahlung ausgesetzt zu werden. Das Vorsehen einer derartigen Lichtquelle an einem Bankschalter sowie die unauffällige Prüfung von Banknoten ist ohne größere Schwierigkeiten möglich. Es ist hierfür sogar denkbar, die Lichtquelle unterhalb des Tisches vorzusehen und die Fluoreszenzanregung durch eine im Tisch eingelassene Platte vorzunehmen, die nur für ultraviolettes Licht durchlässig ist, so daß die Fluoreszenzprüfung vom Kunden noch weniger oder überhaupt nicht bemerkt wird. Eine umständliche, zeitraubende und für den Kunden vor allem kompromittierende Prüfung durch eine beispielsweise mikroskopische Betrachtung, die an einem Bankschalter nahezu nicht durchzuführen ist, kann somit unterbleiben. UV-Strahlungsquellen sind auch als Handgeräte, nach Art einer Taschemlampe, erhältlich, so daß die Echtheit des Sicherheitspapiers auch an jedem beliebigen Ort eindeutig und verläßlich festgestellt werden kann. Hilfreich dafür ist auch die Tatsache, daß es sich bei dem Echtheitsmerkmal um einen, auch für Laien, einprägsamen und erinnerbaren Effekt handelt. Der zunächst farblose, unscheinbare Sicherheitsfaden erhält unter UV-Lichtbestrahlung plötzlich eine intensiv bunte Farbwirkung, wobei die Farben beispielsweise in der Reihung des natürlichen Lichtspektrums aufeinanderfolgen. Sind in der Nähe des Sicherheitsfadens oder aus anderer Stelle im Druckbild gleiche normale Farben vorgesehen, die idealerweise auch in gleicher Reihenfolge vorliegen können, ist außerdem ein einfacher direkter Vergleich mit den Farben des Sicherheitsfadens möglich. Natürlich ist auch eine automatische Prüfung durch entsprechende Detektoren nicht ausgeschlossen.Apart from the high security standard, the thread is still light and can be checked for authenticity without difficulty. The corresponding security paper only needs to be exposed to UV radiation. The provision of such a light source at a bank counter and the inconspicuous checking of banknotes is possible without major difficulties. It is even conceivable for this to provide the light source below the table and to carry out the fluorescence excitation through a plate embedded in the table, which is only permeable to ultraviolet light, so that the fluorescence test is less or not noticed by the customer. A cumbersome, time-consuming and, above all, compromising test for the customer by, for example, microscopic inspection, which can hardly be carried out at a bank counter, can be avoided. UV radiation sources are also available as handheld devices, in the manner of a pocket torch, so that the authenticity of the security paper can also be clearly and reliably determined at any location. Also helpful is the fact that the authenticity feature is a memorable and memorable effect, even for lay people. The initially colorless, inconspicuous security thread suddenly receives an intensely colorful color effect when exposed to UV light, the colors following one another, for example, in the order of the natural light spectrum. If the same normal colors are provided near the security thread or from elsewhere in the printed image, which ideally can also be in the same order, a simple direct comparison with the colors of the security thread is also possible. Of course, an automatic test using appropriate detectors is not excluded.

Fluoreszenzstoffe, die sich für die erfindungsgemäß vorgeschlagenen Druckfarben eignen, sind im Prinzip bekannt, wenn auch im Handel nur schwer erhältlich. Beispielsweise sind in der DE-B 30 32 611 Seltenerdmetallsalz-Leuchtstoffe offenbart, die rot und grün emittieren. In der EP-A 0 007 383 sind blau emittierende europiumdotierte Leuchtstoffe beschrieben und schließlich nennt die US-A 3,525,698 Seltenerdmetallphosphate, die leuchtend grün emittieren. Für die Auswahl geeigneter Leuchtstoffe wird auf die Offenbarung der genannten Druckschriften ausdrücklich Bezug genommen; die Verwendung anderer Leuchtstoffe ist damit jedoch nicht ausgeschlossen, soweit sie die erfindungsgemäßen Anforderungen erfüllen. Bei der Auswahl muß beachtet werden, daß die Körperfarbe weiß ist oder die Stoffe farblos transparent sind, daß die Stoffe voneinander gut unterscheidbare Fluoreszenzemissionen aufweisen, die in jeweils gemischter Form sich ebenfalls charakteristisch voneinander unterscheiden. Besonders geeignet sind hierfür Farben, die eine hohe Farbreinheit aufweisen und deren Emissionsspektren möglichst den Idealwerten der additiven Farbmischung entsprechen. Es versteht sich von selbst, daß auch auf Beständigkeit gegen Umwelteinflüse geachtet werden sollte. Die Berücksichtigung derartiger Aspekte sind dem Fachmann allerdings geläufig.Fluorescent substances which are suitable for the printing inks proposed according to the invention are known in principle, even if they are difficult to obtain commercially. For example, DE-B 30 32 611 contains rare earth metal salt phosphors disclosed that emit red and green. EP-A 0 007 383 describes blue-emitting europium-doped phosphors and finally, US Pat. No. 3,525,698 mentions rare earth metal phosphates which emit bright green. For the selection of suitable phosphors, reference is expressly made to the disclosure of the publications mentioned; however, the use of other phosphors is not excluded insofar as they meet the requirements according to the invention. When making the selection, it must be taken into account that the body color is white or the materials are colorlessly transparent, that the materials have clearly distinguishable fluorescent emissions, which, when mixed, also differ characteristically from one another. Colors which are of high color purity and whose emission spectra correspond as far as possible to the ideal values of the additive color mixture are particularly suitable. It goes without saying that attention should also be paid to resistance to environmental influences. However, the skilled worker is familiar with such aspects.

Statt der genannten Fluoreszenzstoffe können auch phosphoreszierende Farben verwendet werden. Durch das Übereinanderdrucken dieser Farben im Überlappungsbereich kann hier durch unterschiedlich lange Nachleuchtzeiten ein Farbwechsel auftreten. Dieser Farbwechsel wäre ein weiteres Echtheitskriterium, welches eine Fälschung zusätzlich erschwert. Derartig phosphoreszierende Farben sind beispielsweise in der EP-A 0 003 187 beschrieben. Auf die Offenbarung dieser Druckschrift wird ebenfalls ausdrücklich Bezug genommen.Instead of the fluorescent substances mentioned, phosphorescent colors can also be used. By printing these colors on top of each other in the overlap area, a change in color can occur due to different long persistence times. This color change would be a further authenticity criterion, which makes counterfeiting even more difficult. Such phosphorescent colors are described, for example, in EP-A 0 003 187. Reference is also expressly made to the disclosure of this publication.

Nachfolgend sind Ausführungsformen der Erfindung anhand der beigefügten Zeichnung beispielsweise beschrieben. Darin zeigen:

Fig. 1
die schematische Darstellung der Anordnung der Abschnitte und Überlappungsbereiche auf einem Sicherheitsfaden,
Fig. 2
die schematische Darstellung der Anordnung der Abschnitte und Überlappungsbereiche, wobei die Farben im Rasterdruckverfahren aufgedruckt sind,
Fig. 3
die Emissionsspektren der drei Grundfarben der additiven Farbmischung und
Fig. 4
die schematische Darstellung der Farbmengenverteilung über die Länge des Sicherheitsfadens für Farben mit gleicher Leuchtstärke.
Embodiments of the invention are described below with reference to the accompanying drawing, for example. In it show:
Fig. 1
the schematic representation of the arrangement of the sections and overlap areas on a security thread,
Fig. 2
the schematic representation of the arrangement of the sections and overlapping areas, the colors being printed in the raster printing process,
Fig. 3
the emission spectra of the three primary colors of the additive color mixture and
Fig. 4
the schematic representation of the color quantity distribution over the length of the security thread for colors with the same luminosity.

Die Anordnung der Abschnitte 1, 2 sowie der Überlappungsbereiche 3 ist in Fig. 1 schematisch dargestellt. Der Abschnitt 1 ist beispielsweise mit einer blau-emittierenden Farbe bedruckt, Bereich 2 mit einer rot-emittierenden Farbe. Die Farbe im Überlappungsbereich wäre demnach violett bzw. magenta. Für den Fall, daß für die Grundfarben der Abschnitte 1 und 2 rot und grün gewählt wird, wäre die sich im Überlappungsbereich 3 ergebende Mischfarbe gelb, für den Fall, daß grün und blau als Grundfarbe gewählt werden, wäre die Mischfarbe im Überlappungsbereich 3 zyan, d. h. blau-grün.The arrangement of the sections 1, 2 and the overlap regions 3 is shown schematically in FIG. 1. Section 1 is printed with a blue-emitting color, for example, area 2 with a red-emitting color. The color in the overlap area would therefore be violet or magenta. In the event that red and green are selected for the basic colors of sections 1 and 2, the mixed color resulting in the overlap area 3 would be yellow, in the event that green and blue are selected as the primary color, the mixed color in the overlap area 3 would be cyan, d. H. blue green.

In Fig. 3 sind die idealen Emissionsspektren der drei Grundfarben der additiven Farbmischung blau, grün und rot dargestellt, das Intensitätsmaximum der blauen Farbe liegt bei etwa 450 nm, für grün bei 520 nm und für rot bei 690 nm. Die Werte der für Fälschungen erhältlichen Druckfarben nähern sich diesen Kurven erfahrungsgemäß nur mehr oder weniger stark an. Auch weisen diese Farben in der Regel nicht die notwendige Farbreinheit auf, so daß sich erfahrungsgemäß das Spektrum der Mischfarbe zu stark verschiebt bzw. statt der Mischfarbe nur mehr oder weniger schmutzige Farbtöne entstehen.3 shows the ideal emission spectra of the three primary colors of the additive color mixture blue, green and red, the maximum intensity of the blue color is approximately 450 nm, for green 520 nm and for red 690 nm. The values of those available for counterfeiting Experience has shown that printing inks only approach these curves to a greater or lesser extent. These colors also generally do not have the necessary color purity, so that experience has shown that the spectrum of the mixed color is too strong shifts or instead of the mixed color only more or less dirty shades arise.

Wählt man für die aufeinanderfolgenden Abschnitte 1, 2, 1 die Grundfarben rot, grün, blau, so weisen die Überlappungsbereiche die Mischfarben gelb, blau-grün (zyan) und violett (magenta) auf. Die Farbreihenfolge entspricht der Farbreihenfolge, die durch eine Prismenzerlegung des weißen Tageslichts erreicht wird oder auch im Regenbogen auftritt. Der ästetische Effekt eines solchen Fadens ist besonders eindrucksvoll.If one chooses the primary colors red, green, blue for the successive sections 1, 2, 1, the overlapping areas have the mixed colors yellow, blue-green (cyan) and violet (magenta). The color order corresponds to the color order that is achieved by prismatic decomposition of white daylight or that occurs in the rainbow. The aesthetic effect of such a thread is particularly impressive.

Grundsätzlich sind natürlich auch Mischfarben verwendbar. Aufgrund der erwähnten Probleme ist die Zusammenstellung von zueinander passender Mischfarben, die im Überlappungsbereich auch ausreichend reine und charakteristische Mischfluoreszenzen ergeben, äußerst schwierig. Liegt eine derartige brauchbare Farbzusammenstellung aber vor, ist diese für Außenstehende und somit auch für Fälscher praktisch überhaupt nicht mehr nachzustellen.In principle, mixed colors can of course also be used. Because of the problems mentioned, the combination of matching mixed colors, which also result in sufficiently pure and characteristic mixed fluorescence in the overlap area, is extremely difficult. However, if such a useful color combination is available, it is practically impossible to reproduce for outsiders and therefore also for counterfeiters.

In Fig. 4 ist schematisch die Farbmengenverteilung über der Länge des Fadens wiedergegeben, wie sie im Idealfall für Farben gleicher Leuchtstärke gewählt werden sollte. Im Überlappungsbereich 3 wird die Menge der Farbe 1 von einem konstanten Maximalwert aus kontinuierlich auf Null verringert, während die Farbe 2 gleichzeitig von Null ausgehend kontinuierlich auf diesen Wert erhöht wird. In der Summe ergibt sich eine konstante Farbmenge und fließende, kontinuierliche Farbübergänge zu den Farben der jeweils benachbarten Bereiche 1 und 2.4 schematically shows the distribution of the amount of color over the length of the thread, as it should ideally be chosen for colors of the same luminosity. In the overlap area 3, the quantity of color 1 is continuously reduced to zero from a constant maximum value, while color 2 is simultaneously continuously increased to this value starting from zero. The total results in a constant amount of color and smooth, continuous color transitions to the colors of the adjacent areas 1 and 2.

Für den Fall, daß Farben unterschiedlicher Leuchtstärke verwendet werden, kann die Farbmenge zur Regulierung der Leuchtstärke entsprechend eingestellt werden. Da die Fluoreszenzintensität einer Druckfarbe in bestimmten Grenzen auch von der Farbmenge bzw. Schichtdicke abhängt, ist für weniger leuchtstarke Farben eine höhere Farbmenge zu wählen und umgekehrt. Für einen möglichst ästhetisch ansprechenden Eindruck ist es besonders eindrucksvoll, wenn alle verwendeten Farben etwa die gleiche Leuchtstärke aufweisen. In diesem Fall hat der Fälscher auch eine weitere Hürde bei der Nachahmung, da weder das Aufeinanderabstimmen der Intensitäten, noch das Reproduzieren der notwendigen Schichtdicken ohne entsprechende Fachkenntnisse nicht so ohne weiteres möglich ist.In the event that colors of different luminosity are used, the amount of color can be adjusted accordingly to regulate the luminosity. Since the fluorescence intensity of a printing ink also depends on the amount of ink or layer thickness within certain limits, a higher quantity of color should be selected for less bright colors and vice versa. For an aesthetically appealing impression, it is particularly impressive if all the colors used have approximately the same luminosity. In this case, the counterfeiter also has another hurdle in copying, since it is not so easy to match the intensities to one another or to reproduce the necessary layer thicknesses without appropriate specialist knowledge.

Für den Fachmann ergibt sich für die Zusammenstellung der Farben keine unüberwindliche Schwierigkeit, soweit er mit ausreichenden drucktechnischen Hilfsmitteln und Kenntnissen ausgestattet ist. Zur Ermittlung der jeweils notwendigen Schichtdicken wird er so, z. B. mittels Siebdruck, sogenannte Farb-Intensitätskeile drucken, bei denen die Schichtdicke und damit die Fluoreszenzintensität von einer minimalen zu einer maximalen Schichtdicke kontinuierlich oder gestuft zunimmt. Liegt von jeder Grundfarbe ein derartiger Intensitätskeil vor, so müssen diese unter UV-Beleuchtung und von einer gemeinsamen Schlitzmaske abgedeckt nur so lange zueinander verschoben werden, bis zueinander passende Intensitäten nebeneinander liegen. Hat man derartige passende Intensitäten ermittelt, hat der Fachmann auch die hierfür notwendigen Schichtdicken. Diese Schichtdicken sind dann mit dem dem Fachmann geläufigen, dem Fälscher aber auch nicht unbedingt zugänglichen, Fachwissen reproduzierbar.For the expert, there is no insurmountable difficulty in compiling the colors, provided that he is equipped with sufficient printing aids and knowledge. To determine the layer thicknesses required in each case, it is so, for. B. by means of screen printing, so-called color intensity wedges, in which the layer thickness and thus the fluorescence intensity increases continuously or in stages from a minimum to a maximum layer thickness. If there is such an intensity wedge of each basic color, these need only be shifted towards each other under UV illumination and covered by a common slit mask until matching intensities lie next to one another. Once such suitable intensities have been determined, the person skilled in the art also has the layer thicknesses required for this. These layer thicknesses can then be reproduced with the specialist knowledge familiar to the person skilled in the art but not necessarily accessible to the counterfeiter.

Das genannte Verfahren kann sowohl zur Aufeinanderabstimmung von in homogenen Farbflächen als auch von in Rasterdrucktechnik erzeugten Farbflächen verwendet werden.The above-mentioned method can be used both for matching of one another in homogeneous color areas and of color areas generated in raster printing technology.

In Fig. 2 ist schematisch eine andere Variante des erfindungsgemäßen Sicherheitsfadens dargestellt. Die Grundfarben 1 und 2 sind dabei nicht homogen auf dem Träger verteilt, sondern nur in Form einzelner Farbpunkte rasterartig aufgedruckt. In den Überlappungsbereichen 3 sind Farbpunkte beider Farben, d. h. der Grundfarben 1 und 2 vorhanden, so daß, aus einiger Entfernung betrachtet, der Eindruck einer Mischfarbe entsteht. Selbstverständlich sind die Farbpunkte so klein und so dicht nebeneinandergesetzt, daß sie das Auge ohne Hilfsmittel einzeln gar nicht oder nur schwer auflösen kann.Another variant of the security thread according to the invention is shown schematically in FIG. The primary colors 1 and 2 are not distributed homogeneously on the support, but only in the form of individual color dots in a grid pattern printed on. In the overlapping areas 3 there are color dots of both colors, ie the primary colors 1 and 2, so that, viewed from a distance, the impression of a mixed color is created. Of course, the color dots are so small and so close together that they cannot be resolved by the eye individually or with difficulty.

Die jeweilige Dichte der Farbpunkte in den Überlappungsbereichen kann entsprechend Fig. 4 zum Ende des Abschnitts hin kontinuierlich abnehmen, während die Dichte der Farbpunkte des nächstfolgenden, überlappenden Abschnitts von Null kontinuierlich auf einen bestimmten Wert zunimmt. Die sich ergebende Mischfarbe geht dann nicht abrupt, sondern kontinuierlich und fließend in die Farben der jeweils benachbarten Abschnitte über.The respective density of the color dots in the overlap areas can decrease continuously towards the end of the section according to FIG. 4, while the density of the color dots of the next overlapping section increases continuously from zero to a certain value. The resulting mixed color then does not change abruptly, but continuously and smoothly into the colors of the adjacent sections.

Die Herstellung der Sicherheitsfäden erfolgt in bekannter Art und Weise, d. h. durch streifenförmiges Bedrucken flächiger Folien und anschließendes Zerschneiden. Auch ein Bedrucken der Einzelfäden ist im Prinzip denkbar, für Großserien aber weniger geeignet. Die anzuwendende Drucktechnik hängt von den verwendeten Trägermaterialien und den Eigenschaften der Druckfarbe ab. Siebdruckverfahren eignen sich insbesondere deswegen, weil dort eine besonders einfache Regulierung der Farbmenge möglich ist. Es ist aber auch das lokale mehrfache Überdrucken definierter, einheitlicher Schichtdicken möglich.The security threads are produced in a known manner, i. H. by printing flat films in strips and then cutting them. Printing the individual threads is also conceivable in principle, but less suitable for large series. The printing technique to be used depends on the carrier materials used and the properties of the printing ink. Screen printing processes are particularly suitable because they allow particularly simple regulation of the amount of ink. However, local multiple overprinting of defined, uniform layer thicknesses is also possible.

Statt Drucken sind auch andere Auftragsverfahren für die Druckfarbe möglich. So kann die Farbe beispielsweise durch Sprühen oder Spritzen im freien Strahl aufgebracht werden. Die Schichtdicken werden dabei durch die Größe der Sprühdüsen, die Sprühdauer, Mehrfachbesprühen, etc. eingestellt.Instead of printing, other application methods for the printing ink are also possible. For example, the paint can be applied by spraying or spraying in a free jet. The layer thicknesses are set by the size of the spray nozzles, the spray duration, multiple spraying, etc.

Als Trägermaterial für den Sicherheitsfaden eignet sich im Prinzip jeder reißfeste Kunststoff. Die Reißfestigkeit ist von Bedeutung, da der Sicherheitsfaden beim Einlagern in das Sicherheitspapier mechanisch stark beansprucht wird. Bewährt hat sich in diesem Zusammenhang transparente Polyesterfolie. Wenn das Trägermaterial transparent ist, braucht beim Einlagern nicht auf eine gleichbleibende Orientierung des Sicherheitsfadens geachtet zu werden, da die emittierten Farben auch von der Rückseite des Sicherheitsfadens her durch das Trägermaterial hindurch erkennbar sind. Wird andererseits ein opakes Trägermaterial verwendet, muß auf eine gleichbleibende Orientierung des Sicherheitsfadens im Papier geachtet werden, wenn die Fluoreszenzeffekte bei allen Wertpapieren auf der gleichen Seite erscheinen sollen, anderenfalls muß das Trägermaterial beidseitig bedruckt sein.In principle, any tear-resistant plastic is suitable as a carrier material for the security thread. The tensile strength is important because the security thread is mechanically stressed when it is stored in the security paper. In this context, transparent polyester film has proven itself. If the backing material is transparent, it is not necessary to ensure that the security thread remains in the same orientation during storage, since the colors emitted can also be seen from the back of the security thread through the backing material. If, on the other hand, an opaque backing material is used, care must be taken to ensure that the security thread in the paper remains in the same orientation if the fluorescence effects are to appear on the same page for all securities, otherwise the backing material must be printed on both sides.

Die Sicherheitsfäden können neben den farbigen Bereichen natürlich noch weitere charakteristische Merkmale aufweisen, die bei einer Echtheitsprüfung zusätzlich ausgewertet werden. So sind beispielsweise nur maschinell erkennbare Merkmale wie eine metallische bzw. elektrisch leitfähige Zwischenschicht oder magnetische Einlagerungen möglich.In addition to the colored areas, the security threads can of course also have other characteristic features which are additionally evaluated in an authenticity check. For example, only machine-recognizable features such as a metallic or electrically conductive intermediate layer or magnetic inclusions are possible.

Die Einbettung des Sicherheitsfadens in das Papier erfolgt ebenfalls in bekannter Art und Weise, beispielsweise durch Zuführen des Fadens auf die Trommel einer Rundsiebpapiermaschine. Dabei kann es nützlich sein, wenn der Faden zumindest einseitig nur von einer relativ dünnen Papierschicht abgedeckt wird, wenn der Farbeffekt durch die Papierschicht zu stark gedämpft wird. Eine durch Fenster unterbrochene Einbettung des Fadens ist hierfür ebenfalls möglich. Ein solches Verfahren wird beispielsweise in der DE-A 36 01 114 beschrieben.The security thread is also embedded in the paper in a known manner, for example by feeding the thread onto the drum of a circular paper machine. It can be useful here if the thread is covered at least on one side only by a relatively thin paper layer, if the color effect is dampened too much by the paper layer. Embedding the thread interrupted by windows is also possible for this. Such a method is described for example in DE-A 36 01 114.

Claims (14)

  1. A security paper, in particular a bank note, having embedded therein, running from edge to edge, a security thread to which luminescent colors are applied, characterized in that the luminescent colors are invisible in normal lighting, and along the security thread there are successive and overlapping portions (1, 2, 3) which, when the colors are excited, have a length recognizable to the naked eye and which are each printed or coated with a different luminescent color, and a characteristic compound color results in the overlapping areas (3).
  2. A security paper according to claim 1, characterized in that the compound color of the overlapping area (3) runs smoothly and continuously into the colors of the portions including the overlapping area.
  3. A security paper according to claim 1 or 2, characterized in that the luminescent colors are selected in such a way that the successive portions have basic colors of the additive color mixture and the particular, substantially pure compound colors result in the overlapping areas.
  4. A security paper according to claim 3, characterized in that the fluorescent colors contain phosphors which emit red, green and/or blue light and the overlapping areas appear orange, green and/or violet.
  5. A security paper according to claim 4, characterized in that the portions are printed red, green and blue so that the succession of colors in the portions and overlapping areas corresponds to the order of color in the natural spectrum.
  6. A security paper according to claim 5, characterized in that the overlapping of the portions is selected in such a way that the length of the overlapping areas showing compound colors corresponds to the length of the nonoverlapping portions showing basic colors.
  7. A security paper according to any of claims 1 to 6, characterized in that two colors are disposed on top of each other in the overlapping areas.
  8. A security paper according to claim 7, characterized in that at the beginning and end of each portion the particular quantity of color decreases continuously, so that in the overlapping areas there is approximately the same quantity of color altogether as in the portions.
  9. A security paper according to any of claims 1 to 6, characterized in that two colors are printed into each other in a grid-like manner in the overlapping areas.
  10. A security paper according to claim 9, characterized in that at the beginning and end of each portion the grid density decreases continuously, so that the overlapping areas have approximately the same grid density altogether as the portions.
  11. A security paper according to one or more of claims 1 to 10, characterized in that the luminescent colors are selected so as to have high color purity and approximately the same luminosity with the same quantity of color.
  12. A security paper according to one or more of claims 1 to 10, characterized in that the quantity of color in the portions is dosed in accordance with the particular luminosity of the colors so as to result in constant luminosity results over the length of the thread.
  13. A security paper according to one or more of the above claims, characterized in that the luminescent colors contain phosphorescent phosphors and the afterglow time varies in the basic colors used.
  14. A security paper according to one or more of the above claims, characterized in that the carrier material of the security thread is transparent.
EP87112042A 1987-08-19 1987-08-19 Security paper Expired - Lifetime EP0303725B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP87112042A EP0303725B1 (en) 1987-08-19 1987-08-19 Security paper
AT87112042T ATE77427T1 (en) 1987-08-19 1987-08-19 SECURITY PAPER.
ES198787112042T ES2032787T3 (en) 1987-08-19 1987-08-19 SECURITY ROLE
DE8787112042T DE3779918D1 (en) 1987-08-19 1987-08-19 SECURITY PAPER.
US07/228,896 US4897300A (en) 1987-08-19 1988-08-04 Security paper
FI883737A FI89251C (en) 1987-08-19 1988-08-11 SAEKERHETSPAPPER
KR1019880010353A KR960015820B1 (en) 1987-08-19 1988-08-13 Security paper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87112042A EP0303725B1 (en) 1987-08-19 1987-08-19 Security paper

Publications (2)

Publication Number Publication Date
EP0303725A1 EP0303725A1 (en) 1989-02-22
EP0303725B1 true EP0303725B1 (en) 1992-06-17

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Family Applications (1)

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EP87112042A Expired - Lifetime EP0303725B1 (en) 1987-08-19 1987-08-19 Security paper

Country Status (7)

Country Link
US (1) US4897300A (en)
EP (1) EP0303725B1 (en)
KR (1) KR960015820B1 (en)
AT (1) ATE77427T1 (en)
DE (1) DE3779918D1 (en)
ES (1) ES2032787T3 (en)
FI (1) FI89251C (en)

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US5667317A (en) * 1995-08-29 1997-09-16 Ncr Corporation Fluorescent security system for printed transaction records
CN105648839A (en) * 2016-01-21 2016-06-08 成都印钞有限公司 Multi-safety-line-overlaid anti-fake paper and papermaking technology thereof
CN105648839B (en) * 2016-01-21 2018-04-13 成都印钞有限公司 A kind of papermaking process of more safety line superposition anti-forge papers and the anti-forge paper
WO2025067985A1 (en) * 2023-09-28 2025-04-03 Giesecke+Devrient Currency Technology Gmbh Security element with a luminescent security feature

Also Published As

Publication number Publication date
US4897300A (en) 1990-01-30
ATE77427T1 (en) 1992-07-15
FI883737A0 (en) 1988-08-11
FI883737L (en) 1989-02-20
EP0303725A1 (en) 1989-02-22
KR960015820B1 (en) 1996-11-21
FI89251B (en) 1993-05-31
KR890004031A (en) 1989-04-19
DE3779918D1 (en) 1992-07-23
ES2032787T3 (en) 1993-03-01
FI89251C (en) 1993-09-10

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