EP0839097B1 - Herstellung eines sicherheitsdokumentes mit metallischem sicherheitsmerkmal - Google Patents

Herstellung eines sicherheitsdokumentes mit metallischem sicherheitsmerkmal Download PDF

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Publication number
EP0839097B1
EP0839097B1 EP96924055A EP96924055A EP0839097B1 EP 0839097 B1 EP0839097 B1 EP 0839097B1 EP 96924055 A EP96924055 A EP 96924055A EP 96924055 A EP96924055 A EP 96924055A EP 0839097 B1 EP0839097 B1 EP 0839097B1
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EP
European Patent Office
Prior art keywords
substrate
region
security
paper
metal
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
EP96924055A
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English (en)
French (fr)
Other versions
EP0839097A1 (de
Inventor
Anthony David Harman
Brian Chorley
Robert John Furley
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.)
Governor and Co of Bank of England
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Governor and Co of Bank of England
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Filing date
Publication date
Application filed by Governor and Co of Bank of England filed Critical Governor and Co of Bank of England
Publication of EP0839097A1 publication Critical patent/EP0839097A1/de
Application granted granted Critical
Publication of EP0839097B1 publication Critical patent/EP0839097B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B42D25/20—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

Definitions

  • This invention relates to the production of a metallic security feature on a printed security document such as a bank note, which may be based on a synthetic plastic or paper substrate.
  • a reflective surface constituted by, for example, metallic foil is in appropriate circumstances an effective countermeasure against unauthorised reproduction of bank notes or security documents by means of photocopying, digital scanning and reprinting, as well as providing a visibly verifiable security feature.
  • the thickness of an applied surface feature of this kind is in the range, generally, from 1 to 100 micrometres.
  • the present invention is particularly intended for the production of a metallized stripe on security paper, so as to derive a security feature for a bank note or other security document.
  • the invention may be applicable to the production of more complex patterns on paper or other substrates such as plastic cards.
  • the invention comprises two principal stages. The most important of these stages consists of the dry spraying of a metallic material on to the surface of the paper. A variety of techniques, such as gas flame spraying, electric arc spraying or plasma spraying may be employed, as further explained hereinafter.
  • a substrate such as paper with a sizing agent
  • the treatment of the paper with a sizing agent need not require an additional step because the paper may already contain a sizing agent.
  • a sizing agent may be applied to the paper substrate before the metal is sprayed onto the paper substrate.
  • the metal spraying produces a generally porous dull deposit of metal on the paper. It is found however that such a deposit, which may be in the form of a stripe or a more complex pattern, can readily be converted to a reflective state by for example crushing or burnishing and accordingly the second principal stage comprises the surface treatment of the sprayed metal in a manner which will convert it to a more specularly reflective state.
  • the invention is particularly suitable in combination with the formation of a relief pattern in the manner of intaglio printing.
  • a manner of printing wherein the formation of the relief pattern is followed by the deposition of ink in the valleys of the pattern, has been known for many years past.
  • the present invention allows for the formation of a relief or surface texture pattern, which may be formed by the use of an intaglio press or another pressure mechanism for the surface treatment of the deposited metal so that a single treatment stage may render the metal reflective and form a relief pattern.
  • the invention is particularly concerned with the production of a security feature in the form of a stripe composed of sprayed metal particles, preferably produced by the dry spraying of hot particles onto the substrate, which may be paper but could be a synthetic plastic, of a security document.
  • a particularly suitable form of a method according to the invention is one which produces a long, preferably continuous, stripe along the length of a long web of paper such as typically produced by a paper mill.
  • a bank note printing machine or other high volume security printing machine commonly accepts long rolls of paper and prints, in a variety of styles and using a variety of printing techniques, bank notes or other security documents on the roll, typically in multiple rows and columns.
  • Many modern machines or processes perform some printing or finishing stages wherein the web is cut up into individual sheets (usually containing an array of partially printed documents) and further printing processes are performed on the sheets which are, for example, finally cut up to provide the individual documents. It is known to print the documents in at least approximate register with elongate stripes, for example in the form of an embedded security thread running lengthwise of the paper web and embedded in the web during the manufacture of the paper substrate.
  • One advantage of the invention is that it may employ equipment which is well established for the spraying of metal workpieces, with minor modifications, in a paper making process which also uses well established forms of equipment.
  • a long web of paper is output from a supply 2.
  • the paper web is traversed at an appropriate speed through a metal spraying stage 3, wherein a spray gun 4 provides a spray 5 of hot metal particles onto the paper substrate. Thereafter the paper is traversed through a treatment stage 6, comprising in this example two rollers 7 and 8 of which the purpose will be described later.
  • the metal spraying may be performed by a spraying machine in principle similar to machines currently used for the spraying of metallic material onto metal workpieces.
  • One spraying process which would be suitable is electric arc spraying, wherein raw metallic material in the form of a pair of metallic wires is melted by an electric arc, atomised by a cone of compressed air, and propelled towards the workpiece.
  • the wires may be in the order of 1 or 2 millimetres in diameter. The method may be performed while the substrate is traversed relative to the spraying equipment and typically a traversing speed of 2 metres per minute is obtainable.
  • Metal spraying equipment for this purpose is obtainable, for example, from Metallization Limited, Dudley, England.
  • Another form of spraying which may be suitable is gas flame spraying, wherein raw material in the form of a single wire of cord or even powder is melted in a gas flame, the material being atomized by a cone of compressed air and propelled towards the workpiece.
  • a further alternative is plasma spraying, wherein a plasma is created by an electric arc within the nozzle of a plasma gun and the arc gasses are formed into a plasma jet as it emerges from an anodic nozzle. Powder particles are injected into the jet where they melt and subsequently strike the surface of the workpiece. The workpiece can remain cool because the plasma is localized at the gun.
  • Equipment suitable for these purposes is obtainable from Metallization Limited or from Metco Inc, Westbury, New York State.
  • the rate of atomization of the raw material tends to be rather high so that the width of deposit of material on a moving substrate would typically 50 to 60 millimetres if the paper were sprayed from a distance of 15 to 25 centimetres. It may therefore be preferable either to reduce the dimensions and adjust the operating conditions of the spraying apparatus to produce a narrower stripe, or to use a sacrificial mask.
  • the width of the stripe may be reduced by using smaller wire diameters in an electric arc spraying process, lower wire feedrates, and/or by modification of dimensions of or pressure in the compressed air nozzle.
  • a mask may be used adjacent to the paper or spaced from it. In the latter case, the stripe of material which is laid down will have a slightly irregular or feathered edge. A feathery edge effect is also obtainable by omitting the use of a mask entirely.
  • a variety of metals may be employed. It is preferable to employ zinc or an alloy of zinc and tin for the sprayed metal. Other materials, such as aluminium, might be used although the cohesion of the metal particles deposited on paper is less strong than when zinc or an alloy of zinc and tin is used.
  • the paper When the invention is employed in a paper making process, the paper commonly includes a sizing agent which may improve the adhesion of the hot metal particles to the paper. It is possible to employ the invention without any sizing agent, but if it be necessary to employ a sizing agent, typically polyvinyl or other polymeric material which is capable of acting as a adhesive but has a low melting point may be employed.
  • the sizing agent should be activated by the hot metal particles that land on it.
  • the metallized stripe shows excellent adhesion to the paper surface when a sizing agent of the kind mentioned is used, but in a variety of circumstances a special sizing agent would not be necessary.
  • FIG. 2 The result of the spraying stage, as shown in Figure 1, is illustrated in Figure 2 wherein 2 denotes the long web of paper and the reference 9 denotes a stripe (which may be one of a plurality of stripes spaced across the width of the paper) extending lengthwise of the web 1.
  • the stripe produced by the metal spraying has a dull, amorphous, appearance.
  • the width d of the stripe and its marginal irregularity have been greatly exaggerated relative to the width W of the paper web. In typical practice the width d would be of the order of 10 millimetres and the width W of the paper would be of the order of 1 metre.
  • the stripe is subjected to surface treatment to change the surface into a more specularly reflective surface. This may be achieved employing the rollers 7 and 8 as a burnishing or polishing stage, the rollers 7 and 8 operating at different speeds.
  • the rollers 7 and 8 may be constituted by an intaglio printing stage so that at least the stripe and preferably also adjacent regions of the substrate are selectively compressed to form an intaglio or relief pattern.
  • the metallic stripe thereby may be converted into adjacent regions of reflective and dull surface within the borders of the metallic stripe.
  • Figure 3 illustrates schematically a security document 10 having a paper substrate as previously described, a metallic stripe 9 composed of sprayed metal particles and extending across the document, and rendered at least partly reflective, and appropriate lettering 11 and other printing which distinguishes the bank note or security document.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Paper (AREA)
  • Adornments (AREA)
  • Printing Methods (AREA)
  • Coating By Spraying Or Casting (AREA)

Claims (12)

  1. Verfahren zur Herstellung eines reflektierenden Sicherheitsmerkmals auf einem Substrat für ein Sicherheitsdokument mit den Schritten:
    Aufsprühen von Metallpartikeln auf die Oberfläche des Substrats derart, daß ein ausgedehnter Bereich von aufgesprühtem Metall auf der Oberfläche des Substrats erzeugt wird; und
    Behandeln des aufgesprühten Metalls zu seiner Umwandlung in eine teilweise spiegelreflektierende Oberfläche.
  2. Verfahren nach Anspruch 1,
    bei dem das Sprühen durch Gas-, Plasma- oder Lichtbogenspritzen erfolgt.
  3. Verfahren nach Anspruch 1 oder 2,
    bei dem das Metall durch eine Maske aufgesprüht wird, die zwischen der Sprühvorrichtung und dem Substrat angeordnet wird.
  4. Verfahren nach einem vorangehenden Anspruch,
    bei dem der Bereich der Aufbringung des aufgesprühten Metalls variiert wird, um einen Streifen von aufgesprühtem Metall zu erzeugen.
  5. Verfahren nach einem vorangehenden Anspruch,
    bei dem der Behandlungsschritt die Ausbildung eines Reliefmusters durch selektives Komprimieren des Bereiches von aufgesprühtem Metall umfaßt.
  6. Verfahren nach Anspruch 5,
    bei dem der Behandlungsschritt eine Druckausübung auf den Bereich in der Art des Intaglio-Pressens umfaßt.
  7. Verfahren nach einem der Ansprüche 1 bis 4,
    bei dem der Behandlungsschritt das Polieren des Bereiches umfaßt.
  8. Substrat (2) zur Verwendung als Sicherheitsdokument, das auf einer Oberfläche des Substrats ein Sicherheitsmerkmal trägt, bestehend aus einem Bereich (9) aus aufgesprühtem Metall, das mindestens teilweise spiegelreflektierend gemacht worden ist.
  9. Substrat nach Anspruch 1,
    bei dem der Bereich (9) mindestens eine gefiederte oder unregelmäßig verschwimmende Kante hat.
  10. Substrat nach Anspruch 8 oder 9,
    bei dem der Bereich zu einem Reliefmuster geformt ist.
  11. Sicherheitsdokument (10), das auf der Oberfläche eines Substrates des Dokuments ein Sicherheitsmerkmal (9) trägt, mit einem Bereich aus aufgesprühtem Metall, der mindestens teilweise spiegelreflektierend gemacht worden ist.
  12. Sicherheitsdokument nach Anspruch 11,
    bei dem der Bereich zu einem Reliefmuster geformt ist.
EP96924055A 1995-07-18 1996-07-12 Herstellung eines sicherheitsdokumentes mit metallischem sicherheitsmerkmal Expired - Lifetime EP0839097B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9514654 1995-07-18
GBGB9514654.4A GB9514654D0 (en) 1995-07-18 1995-07-18 Production of security document having a metallic security feature
PCT/GB1996/001659 WO1997003844A1 (en) 1995-07-18 1996-07-12 Production of security document having a metallic security feature

Publications (2)

Publication Number Publication Date
EP0839097A1 EP0839097A1 (de) 1998-05-06
EP0839097B1 true EP0839097B1 (de) 1999-05-12

Family

ID=10777829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96924055A Expired - Lifetime EP0839097B1 (de) 1995-07-18 1996-07-12 Herstellung eines sicherheitsdokumentes mit metallischem sicherheitsmerkmal

Country Status (7)

Country Link
EP (1) EP0839097B1 (de)
AT (1) ATE179934T1 (de)
AU (1) AU6463996A (de)
CA (1) CA2226559A1 (de)
DE (1) DE69602446D1 (de)
GB (1) GB9514654D0 (de)
WO (1) WO1997003844A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780915B1 (fr) * 1998-07-10 2000-09-15 Breger Emballages Sa Procede de fabrication d'etiquettes
FR2780914A1 (fr) * 1998-07-10 2000-01-14 Breger Emballages Sa Procede de fabrication d'etiquettes
GB0005857D0 (en) * 2000-03-10 2000-05-03 Rue De Int Ltd Security device
GB2400860A (en) * 2003-04-24 2004-10-27 Gcc Man Ltd Developer sleeve

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2840724B2 (ja) * 1989-07-21 1998-12-24 大蔵省印刷局長 虹彩色を有する透かし文様作成法及びその製品
DE4002979A1 (de) * 1990-02-01 1991-08-08 Gao Ges Automation Org Wertpapier mit optisch variablem sicherheitselement
DE4344552A1 (de) * 1993-12-24 1995-06-29 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zur Ausstattung von Wertpapieren mit Echtheitsmerkmalen

Also Published As

Publication number Publication date
WO1997003844A1 (en) 1997-02-06
AU6463996A (en) 1997-02-18
DE69602446D1 (de) 1999-06-17
ATE179934T1 (de) 1999-05-15
GB9514654D0 (en) 1995-09-13
CA2226559A1 (en) 1997-02-06
EP0839097A1 (de) 1998-05-06

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