EP1922446A1 - Method for producing antifalsification papers, paper mould, and forming element for paper mould - Google Patents

Method for producing antifalsification papers, paper mould, and forming element for paper mould

Info

Publication number
EP1922446A1
EP1922446A1 EP06762343A EP06762343A EP1922446A1 EP 1922446 A1 EP1922446 A1 EP 1922446A1 EP 06762343 A EP06762343 A EP 06762343A EP 06762343 A EP06762343 A EP 06762343A EP 1922446 A1 EP1922446 A1 EP 1922446A1
Authority
EP
European Patent Office
Prior art keywords
paper
shaped
line
elements
screen
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Withdrawn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
EP06762343A
Other languages
German (de)
French (fr)
Inventor
Thomas Bodendieck
Uwe Gruszczynski
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.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP1922446A1 publication Critical patent/EP1922446A1/en
Withdrawn legal-status Critical Current

Links

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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/44—Watermarking devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/008—Making apertured paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/06—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type

Definitions

  • the invention relates to a method for producing a security paper for security or value documents, which has at least one through opening with characteristic irregularities in the edge region.
  • the invention further relates to a paper screen for the production of such security paper as well as a form element for use in such a paper screen.
  • Security documents or documents of value are often provided with various authenticity features for the purposes of security, which permit verification of the authenticity of the security paper or value document and at the same time serve as protection against unauthorized reproduction.
  • security paper refers to the unprinted paper, which is usually present in quasi-endless form and is processed further at a later point in time
  • valuable documents are in particular banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other counterfeit-sensitive papers, such as passports and other identification documents, as well as product security elements, such as labels, seals, packaging and the like ,
  • security paper or "value document” below includes all such documents and product security means.
  • the document WO 95/10420 describes a value document into which a through opening is punched after its production, which subsequently woked with one opening on all sides superior cover is closed on one side.
  • the cover film is transparent at least in a partial area, so that when attempting to copy the document of value, the substrate shines through and reproduced by the copying machine accordingly. In this way counterfeits can be easily detected.
  • the hole created by punching can be generated by a counterfeiter as well.
  • this area can subsequently be punched out analogously to the real value document and closed again with a suitable cover film. Such counterfeits are difficult to recognize.
  • Edge area characteristic irregularities on the finished paper can not be subsequently produced.
  • the irregularities are manifested in particular by the absence of a sharp cutting edge or by irregular attachment of fibers in the edge region and by protruding into the opening of individual fibers. Openings produced in this way have a similarly high security value as a watermark produced during papermaking or a security thread embedded in papermaking.
  • the present invention seeks to provide a generic method that avoids the disadvantages of the prior art.
  • the method is intended to combine the high security against forgery of the openings produced during papermaking with high reproducibility during production.
  • the invention is based on the idea not to produce the irregularly bounded opening by a complete displacement of the pulp already in the sheet formation, but rather to initially create only the outline of the desired shape of the opening in the form of thin spots in the paper web in the sheet formation.
  • the paper web has in these areas then only a small initial strength, so that with the
  • Thin points predetermined breaking points are introduced into the paper web, by means of which the enclosed area can be separated out of the still moist paper web in the subsequent dewatering step.
  • the method now proposed has less susceptibility to variations in sheet formation and changes in the opening shape due to the mobility of the still wet pulp, so that the desired Openings very controlled and reproducible can be introduced.
  • irregularly edged openings with complex outline shapes can be produced with the aid of this method.
  • the paper web is formed on a paper screen with applied linienf örmigen form elements that lead to the formation of thin spots in the paper web during sheet formation.
  • the line-shaped form elements preferably form a substantially closed curve.
  • substantially closed means that the curve formed by the form elements can be completely closed, or can also contain individual curve sections with small intermediate webs therebetween, by means of which the detachment of the area enclosed by the curve sections is not prevented Also, individual curve sections remain completely fiber-free, wherein the region enclosed by the thin areas and fiber-free areas area is still connected to the wet paper web and according to the invention is separated out in the dewatering step from the paper web.
  • the mold elements are advantageously formed by applied to the paper wire linear metal or plastic moldings.
  • the moldings can be soldered, welded or glued to the paper wire, for example.
  • the shaped elements are formed by a line-shaped sealing compound firmly connected to the paper screen.
  • substances which can be applied to the paper screen in the tough state and which firmly bond to the paper screen after an active or passive curing process are suitable as sealing compounds.
  • the sealing compound may be formed by an epoxy resin-based adhesive, a thermosetting solder paste or a UV-cured adhesive.
  • a UV-curing adhesive is first applied over a large area to the paper web and then applied to a mask in desired areas with UV radiation and cured. The uncured part of the adhesive is washed out, so that a molded element of UV-cured sealing compound with the desired shape is formed. Further advantageous embodiments and details are described in the publication WO 03/025281, the disclosure content of which is included in the present application in this respect.
  • the line-shaped form elements preferably have a line width between 0.3 mm and 5 mm, particularly preferably between 0.5 mm and 3 mm.
  • the height of the line-shaped form elements is preferably between 0.5 mm and 2 mm, and in particular between 0.8 mm and 1.5 mm. It is understood that the optimum values for the line width and height can be determined by comparative experiments depending on the desired irregularity of the edge contour, the size of the motif or the properties of the paper pulp.
  • the line-shaped form elements and thus the generated opening form a shape with a complex outline, in particular a graphic motif, such as a floral or leaf motif, or a more complicated geometric shape, such as a multi-pointed star.
  • the paper screen is particularly advantageous to a paper strainer for a rotary screen.
  • the thin spots are preferably generated in sheet formation with only a few superimposed fibers. This ensures that the shapes produced on the one hand can not slip off the screen when the paper web is being taken off, but on the other hand that the strength of the thin areas is extremely low, so that they act as predetermined breaking points in the subsequent dewatering step.
  • the at least one opening is expediently closed on at least one side of the security paper with a film element. In some designs, the opening is even closed on both sides with a foil.
  • the process of the invention is suitable for all substrates with aqueous foliation of natural or synthetic fibers, such as cotton combs, pulps, fibers of organic or inorganic plastics, as well as their blends.
  • FIG. 1 is a schematic representation of a banknote from a security paper according to an embodiment of the invention
  • FIG. 3 is a plan view of a section of the paper wire of the paper machine of Fig. 2 with a soldered metal mold part
  • FIG. 4 shows a plan view of the lifted off from the paper wire and provided by means of the metal mold part of FIG. 3 with thin spots paper web
  • FIG. 5 shows a cross section through the paper web of Fig. 4 along the
  • Fig. 6 shows a cross section of the paper web of Fig. 5 after the dissolution of the area bounded by the thin areas.
  • FIG. 1 shows a schematic representation of a banknote 10 with a through opening 12, which is closed by a transparent foil strip 16.
  • the through hole 12 was doing produced during the manufacture of the security paper used for the banknote 10 and has a fibrous, irregular edge region 14.
  • Such a rim 14 is characteristic of openings already made in sheet formation and can not be subsequently produced by punching or cutting the paper.
  • Fig. 2 shows first a portion of a round screening paper machine 20, as it is used for the production of security papers.
  • 3 shows a plan view of a section of the round screen 22 of the paper machine 20.
  • the round screen paper machine 20 comprises, in addition to the round screen 22, a pickup roller 24, via which a pick-up felt 26 is stretched.
  • line-shaped metal moldings 28 are soldered onto round sieve 22, which form a closed curve in the form of the outline of the opening to be produced, for example the star motif 12 of FIG.
  • the height of the line-shaped metal moldings 28 is selected so that in the region of the thin spots 34 after sheet formation only a few fibers are superimposed, but does not produce a continuous hole in the paper web becomes. In the area of the thin spots 34, the paper web therefore has only a low initial strength, so that the thin spots represent predetermined breaking points. On the other hand, the paper web is also continuous in the area of the thin spots 34, so that the outline shape formed by them does not slip off the round screen 22 when the still wet paper web is taken off.
  • the paper web 32 is dewatered in the press section. During this process, forces act perpendicular to the paper web extension (arrow 36), which cut out the inner region delimited by the thin points 34 acting as predetermined breaking points from the still moist paper web.
  • the result is a continuous opening 12 with characteristic Randunregelwhikeiten 38 (Fig. 6), whose shape is determined by the outline contour formed by the thin spots 34 and thus by the shape of the metal moldings 28.
  • the contour of the opening 12 in the continuous paper web is generated reproducibly, without being adversely affected by fluctuations in the sheet formation and the inherent mobility of the wet pulp.
  • the metal moldings 28 have a stroke width of 2 mm and a height of 1 mm. It is understood that depending on the desired irregularity of the edge profile, the size of the motif or the properties of the paper pulp, other values for the line thickness or the molding height may be considered.
  • the molded parts 28 may also be made of a hard plastic instead of metal, or they may be applied to the wire by a tough state and subsequently hardened sealing compound may be formed.

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  • Paper (AREA)

Abstract

The invention relates to a method for producing an antifalsification paper for security documents or valuable documents, comprising at least one continuous opening (12) exhibiting characteristic irregularities (14) in the edge region thereof. According to the invention, a paper web comprising narrow strips with a contour corresponding to the desired shape of the at least one continuous opening (12) is formed, and the paper web is drained following the formation of the sheet. The region defined by the narrow strips is extracted from the paper web by means of the generated forces.

Description

Verfahren zur Herstellung eines Sicherheitspapiers, Papiersieb und Formelement für Papiersieb Method for producing a security paper, paper screen and forming element for paper screen
Die Erfindung betrifft ein Verfahren zur Herstellung eines Sicherheitspapiers für Sicherheits- oder Wertdokumente, das zumindest eine durchgehende Öffnung mit charakteristischen Unregelmäßigkeiten im Randbereich aufweist. Die Erfindung betrifft ferner ein Papiersieb für die Herstellung derartigen Sicherheitspapiers sowie ein Formelement zum Einsatz in einem sol- chen Papiersieb.The invention relates to a method for producing a security paper for security or value documents, which has at least one through opening with characteristic irregularities in the edge region. The invention further relates to a paper screen for the production of such security paper as well as a form element for use in such a paper screen.
Sicherheitspapiere oder Wertdokumente werden zur Absicherung oft mit verschiedenen Echtheitsmerkmalen ausgestattet, die eine Überprüfung der Echtheit des Sicherheitspapiers oder Wertdokuments gestatten und die zugleich als Schutz vor unerlaubter Reproduktion dienen.Security documents or documents of value are often provided with various authenticity features for the purposes of security, which permit verification of the authenticity of the security paper or value document and at the same time serve as protection against unauthorized reproduction.
Im Sinne der Erfindung bezeichnet dabei der Begriff „Sicherheitspapier" das unbedruckte Papier, das üblicherweise in quasi endloser Form vorliegt und zu einem späteren Zeitpunkt weiterverarbeitet wird. Als „Wertdokument" wird ein Dokument bezeichnet, das für seinen bestimmungsgemäßenFor the purposes of the invention, the term "security paper" here refers to the unprinted paper, which is usually present in quasi-endless form and is processed further at a later point in time
Gebrauch fertig gestellt ist. Wertdokumente im Sinne der vorliegenden Erfindung sind insbesondere Banknoten, Aktien, Anleihen, Urkunden, Gutscheine, Schecks, hochwertige Eintrittskarten, aber auch andere fälschungs- gefährdete Papiere, wie Pässe und sonstige Ausweisdokumente, sowie Pro- duktsicherungselemente, wie Etiketten, Siegel, Verpackungen und dergleichen. Die vereinfachte Benennung „Sicherheitspapier" oder „Wertdokument" schließt im Folgenden alle derartigen Dokumente und Produktsicherungsmittel ein.Use is completed. For the purposes of the present invention, valuable documents are in particular banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other counterfeit-sensitive papers, such as passports and other identification documents, as well as product security elements, such as labels, seals, packaging and the like , The simplified term "security paper" or "value document" below includes all such documents and product security means.
Die Druckschrift WO 95/10420 beschreibt ein Wertdokument, in das nach seiner Herstellung eine durchgehende Öffnung gestanzt wird, die anschlie- ßend mit einer die Öffnung allseits überragenden Abdeckfolie einseitig verschlossen wird. Die Abdeckfolie ist zumindest in einem Teilbereich transparent, so dass beim Versuch, das Wertdokument zu kopieren, der Untergrund durchscheint und vom Kopiergerät entsprechend wiedergegeben wird. Auf diese Weise können Fälschungen leicht erkannt werden. Allerdings kann die durch Ausstanzen erzeugte Öffnung von einem Fälscher ebenso erzeugt werden. Die Farbkopie eines echten Wertdokuments weist zwar den transparenten Bereich nicht mehr auf, dieser Bereich kann jedoch nachträglich analog zum echten Wertdokument ausgestanzt und mit einer passenden Ab- deckfolie erneut verschlossen werden. Derartige Fälschungen sind nur schwer zu erkennen.The document WO 95/10420 describes a value document into which a through opening is punched after its production, which subsequently ßend with one opening on all sides superior cover is closed on one side. The cover film is transparent at least in a partial area, so that when attempting to copy the document of value, the substrate shines through and reproduced by the copying machine accordingly. In this way counterfeits can be easily detected. However, the hole created by punching can be generated by a counterfeiter as well. Although the color copy of a true value document no longer has the transparent area, this area can subsequently be punched out analogously to the real value document and closed again with a suitable cover film. Such counterfeits are difficult to recognize.
Zur Abhilfe ist in der Druckschrift WO 03/054297 vorgeschlagen worden, bereits während der Papierherstellung eine durchgehende Öffnung zu er- zeugen. Eine derartige, bei der Blattbildung erzeugte Öffnung weist imAs a remedy, it has been proposed in document WO 03/054297 to produce a through opening during papermaking. Such, generated in the sheet formation opening has in
Randbereich charakteristische Unregelmäßigkeiten auf, die am fertigen Papier nachträglich nicht herstellbar sind. Die Unregelmäßigkeiten zeigen sich insbesondere durch das Fehlen einer scharfen Schnittkante bzw. durch unregelmäßiges Anlagern von Fasern im Randbereich und durch in die Öffnung ragende Einzelfasern. Derart erzeugte Öffnungen haben einen ähnlich hohen Sicherheitswert wie ein bei der Papierherstellung erzeugtes Wasserzeichen oder ein bei der Papierherstellung eingebetteter Sicherheitsfaden.Edge area characteristic irregularities on the finished paper can not be subsequently produced. The irregularities are manifested in particular by the absence of a sharp cutting edge or by irregular attachment of fibers in the edge region and by protruding into the opening of individual fibers. Openings produced in this way have a similarly high security value as a watermark produced during papermaking or a security thread embedded in papermaking.
Allerdings schwanken solche bei der Papierherstellung erzeugte Öffnungen oft in ihrer Qualität und sind nicht einfach reproduzierbar herzustellen.However, such apertures produced in papermaking often vary in quality and are not easily reproducible to make.
Teilweise besteht auch die Gefahr, dass Faserbündel die Öffnung zu Teil verschließen. Ausgehend davon liegt der Erfindung die Aufgabe zugrunde, ein gattungsgemäßes Verfahren zu schaffen, das die Nachteile des Stands der Technik vermeidet. Insbesondere soll das Verfahren die hohe Fälschungssicherheit der bei der Papierherstellung erzeugten Öffnungen mit hoher Reproduzier- barkeit bei der Herstellung verbinden.Partly there is also the danger that fiber bundles close the opening to part. Based on this, the present invention seeks to provide a generic method that avoids the disadvantages of the prior art. In particular, the method is intended to combine the high security against forgery of the openings produced during papermaking with high reproducibility during production.
Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
Erfindungsgemäß wird bei einem Verfahren der eingangs genannten ArtAccording to the invention in a method of the type mentioned
- auf einem Papiersieb eine Papierbahn mit Dünnstellen in Form des Umrisses der gewünschten Gestalt der zumindest einen durchgehenden Öffnung gebildet, und- Formed on a papermaking a paper web with thin areas in the form of the outline of the desired shape of the at least one through hole, and
- die Papierbahn nach der Blattbildung entwässert, wobei der von den Dünnstellen begrenzte Bereich durch die auftretenden Kräfte aus der Papierbahn herausgelöst wird.- Drawn the paper web after sheet formation, wherein the area limited by the thin areas is removed by the forces occurring from the paper web.
Die Erfindung beruht auf dem Gedanken, die unregelmäßig berandete Öffnung nicht durch eine vollständige Verdrängung des Faserstoffes bereits bei der Blattbildung zu erzeugen, sondern vielmehr bei der Blattbildung zunächst nur den Umriss der gewünschten Gestalt der Öffnung im Form von Dünnstellen in der Papierbahn anzulegen. Die Papierbahn weist in diesen Bereichen dann nur eine geringe initiale Festigkeit auf, so dass mit denThe invention is based on the idea not to produce the irregularly bounded opening by a complete displacement of the pulp already in the sheet formation, but rather to initially create only the outline of the desired shape of the opening in the form of thin spots in the paper web in the sheet formation. The paper web has in these areas then only a small initial strength, so that with the
Dünnstellen Sollbruchstellen in die Papierbahn eingebracht werden, mittels derer der umschlossene Bereich im nachfolgenden Entwässerungsschritt aus der noch feuchten Papierbahn herausgetrennt werden kann. Im Vergleich zu herkömmlichen Verfahren, bei denen die gewünschten Öffnungen durch vollflächige Verdrängung des Faserstoffes erzeugt werden, weist das jetzt vorgeschlagene Verfahren eine geringere Anfälligkeit gegenüber Schwankungen bei der Blattbildung und gegenüber Veränderungen der Öffnungsform durch die Beweglichkeit des noch nassen Faserstoffes auf, so dass die gewünschten Öffnungen sehr kontrolliert und reproduzierbar eingebracht werden können. Mithilfe dieses Verfahrens können insbesondere unregelmäßig berandete Öffnungen mit komplexen Umrissformen erzeugt werden.Thin points predetermined breaking points are introduced into the paper web, by means of which the enclosed area can be separated out of the still moist paper web in the subsequent dewatering step. Compared to conventional methods in which the desired openings are produced by full-surface displacement of the pulp, the method now proposed has less susceptibility to variations in sheet formation and changes in the opening shape due to the mobility of the still wet pulp, so that the desired Openings very controlled and reproducible can be introduced. In particular irregularly edged openings with complex outline shapes can be produced with the aid of this method.
In einer bevorzugten Ausgestaltung des erfindungsgemäßen Verfahrens wird die Papierbahn auf einem Papiersieb mit aufgebrachten linienf örmigen Formelementen gebildet, die während der Blattbildung zur Ausbildung der Dünnstellen in der Papierbahn führen. Die linienf örmigen Formelemente bilden dabei bevorzugt eine im Wesentlichen geschlossene Kurve. „Im Wesentlichen geschlossen" bedeutet dabei, dass die von den Formelementen gebildete Kurve vollständig geschlossen sein kann, oder auch einzelne Kurvenabschnitte mit dazwischen liegenden kleinen Zwischenstegen enthalten kann, durch die das Herauslösen des von den Kurvenabschnitten umschlos- senen Bereichs nicht verhindert wird. Ebenso können auch einzelne Kurvenabschnitte völlig faserfrei bleiben, wobei der von den Dünnstellen und faserfreien Bereichen umschlossene Bereich noch mit der feuchten Papierbahn verbunden ist und erfindungsgemäß im Entwässerungsschritt aus der Papierbahn herausgetrennt wird.In a preferred embodiment of the method according to the invention, the paper web is formed on a paper screen with applied linienf örmigen form elements that lead to the formation of thin spots in the paper web during sheet formation. The line-shaped form elements preferably form a substantially closed curve. "Substantially closed" means that the curve formed by the form elements can be completely closed, or can also contain individual curve sections with small intermediate webs therebetween, by means of which the detachment of the area enclosed by the curve sections is not prevented Also, individual curve sections remain completely fiber-free, wherein the region enclosed by the thin areas and fiber-free areas area is still connected to the wet paper web and according to the invention is separated out in the dewatering step from the paper web.
Die Formelemente sind mit Vorteil durch auf das Papiersieb aufgebrachte linienförmige Metall- oder Kunststoffformteile gebildet. Die Formteile können beispielsweise auf das Papiersieb aufgelötet, aufgeschweißt oder aufgeklebt sein. Bei einer anderen, ebenfalls bevorzugten Variante sind die Formelemente durch eine mit dem Papiersieb fest verbundene linienförmige Verschlussmasse gebildet. Als Verschlussmasse bieten sich insbesondere Stoffe an, die sich im zähen Zustand auf das Papiersieb aufbringen lassen und die sich nach einem aktiven oder passiven Aushärtvorgang fest mit dem Papiersieb verbinden.The mold elements are advantageously formed by applied to the paper wire linear metal or plastic moldings. The moldings can be soldered, welded or glued to the paper wire, for example. In another, likewise preferred variant, the shaped elements are formed by a line-shaped sealing compound firmly connected to the paper screen. In particular, substances which can be applied to the paper screen in the tough state and which firmly bond to the paper screen after an active or passive curing process are suitable as sealing compounds.
Beispielsweise kann die Verschlussmasse durch einen auf Epoxid-Harz basierenden Klebstoff, eine thermisch ausgehärtete Lotpaste oder einen UV- gehärteten Klebstoff gebildet sein. In einer vorteilhaften Ausgestaltung wird ein UV-härtender Klebstoff zunächst großflächig auf das Papiergewebe aufgetragen und dann über eine Maske in gewünschten Bereichen mit UV- Strahlung beaufschlagt und ausgehärtet. Der nicht ausgehärtete Teil des Klebstoffs wird ausgewaschen, so dass ein Formelement aus UV-gehärteter Verschlussmasse mit der gewünschten Form entsteht. Weitere vorteilhafte Ausgestaltungen und Details sind in der Druckschrift WO 03/025281 beschrieben, deren Offenbarungsgehalt insoweit in die vorliegende Anmeldung aufgenommen wird.For example, the sealing compound may be formed by an epoxy resin-based adhesive, a thermosetting solder paste or a UV-cured adhesive. In an advantageous embodiment, a UV-curing adhesive is first applied over a large area to the paper web and then applied to a mask in desired areas with UV radiation and cured. The uncured part of the adhesive is washed out, so that a molded element of UV-cured sealing compound with the desired shape is formed. Further advantageous embodiments and details are described in the publication WO 03/025281, the disclosure content of which is included in the present application in this respect.
Um eine sichere und reproduzierbare Auslösung des umschlossenen Bereichs zu gewährleisten, weisen die linienf örmigen Formelemente bevorzugt eine Strichstärke zwischen 0,3 mm und 5 mm, besonders bevorzugt zwischen 0,5 mm und 3 mm auf. Die Höhe der linienf örmigen Formelemente liegt vorzugsweise zwischen 0,5 mm und 2 mm, und insbesondere zwischen 0,8 mm und 1,5 mm. Es versteht sich, dass die optimalen Werte für die Strichstärke und Höhe je nach der gewünschten Unregelmäßigkeit des Randverlaufs, der Größe des Motivs oder den Eigenschaften der Papiermasse durch Vergleichsversuche ermittelt werden können. Gemäß einer vorteilhaften Ausführungsform bilden die linienförmigen Formelemente und damit die erzeugte Öffnung eine Gestalt mit einem komplexen Umriss, insbesondere ein graphisches Motiv, wie beispielsweise ein Blumen- oder Blattmotiv, oder eine kompliziertere geometrische Form, wie etwa einen mehrzackigen Stern.In order to ensure a safe and reproducible release of the enclosed area, the line-shaped form elements preferably have a line width between 0.3 mm and 5 mm, particularly preferably between 0.5 mm and 3 mm. The height of the line-shaped form elements is preferably between 0.5 mm and 2 mm, and in particular between 0.8 mm and 1.5 mm. It is understood that the optimum values for the line width and height can be determined by comparative experiments depending on the desired irregularity of the edge contour, the size of the motif or the properties of the paper pulp. According to an advantageous embodiment, the line-shaped form elements and thus the generated opening form a shape with a complex outline, in particular a graphic motif, such as a floral or leaf motif, or a more complicated geometric shape, such as a multi-pointed star.
Bei dem Papiersieb handelt sich mit besonderem Vorteil um ein Papiersieb für eine Rundsiebmaschine.The paper screen is particularly advantageous to a paper strainer for a rotary screen.
Die Dünnstellen werden bei der Blattbildung vorzugsweise mit nur wenigen übereinander liegenden Fasern erzeugt. Dies stellt sicher, dass die erzeugten Formen bei der Abnahme der Papierbahn vom Sieb einerseits nicht verrutschen können, dass andererseits aber die Festigkeit der Dünnstellen außerordentlich gering ist, so dass sie beim nachfolgenden Entwässerungsschritt als Sollbruchstellen wirken.The thin spots are preferably generated in sheet formation with only a few superimposed fibers. This ensures that the shapes produced on the one hand can not slip off the screen when the paper web is being taken off, but on the other hand that the strength of the thin areas is extremely low, so that they act as predetermined breaking points in the subsequent dewatering step.
Die zumindest eine Öffnung ist zweckmäßig auf zumindest einer Seite des Sicherheitspapiers mit einem Folienelement verschlossen. In manchen Gestaltungen ist die Öffnung sogar auf beiden Seiten mit einer Folie verschlos- sen.The at least one opening is expediently closed on at least one side of the security paper with a film element. In some designs, the opening is even closed on both sides with a foil.
Auch wenn es vorstehend für ein Papiersubstrat beschrieben wurde, eignet sich das erfindungsgemäße Verfahren für alle Substrate mit wässriger Blattbildung aus natürlichen oder synthetischen Faserstoffen, wie etwa Baum- wollkämmlingen, Zellstoffen, Fasern aus organischen oder anorganischen Kunststoffen, sowie deren Abmischungen.Although described above for a paper substrate, the process of the invention is suitable for all substrates with aqueous foliation of natural or synthetic fibers, such as cotton combs, pulps, fibers of organic or inorganic plastics, as well as their blends.
Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nachfolgend anhand der Figuren erläutert, bei deren Darstellung auf eine maß- stabs- und proportionsgetreue Wiedergabe verzichtet wurde, um die Anschaulichkeit zu erhöhen.Further embodiments and advantages of the invention are explained below with reference to the figures, in the representation thereof to a bar and proportions faithful reproduction was omitted in order to increase the clarity.
Es zeigen:Show it:
Fig. 1 eine schematische Darstellung einer Banknote aus einem Sicherheitspapier nach einem Ausführungsbeispiel der Erfindung,1 is a schematic representation of a banknote from a security paper according to an embodiment of the invention,
Fig. 2 einen Teilbereich einer Papiermaschine zur Herstellung eines erfindungsgemäßen Sicherheitspapiers,2 shows a partial area of a paper machine for producing a security paper according to the invention,
Fig.3 eine Aufsicht auf einen Ausschnitt des Papiersiebs der Papiermaschine von Fig. 2 mit einem aufgelöteten Metallformteil,3 is a plan view of a section of the paper wire of the paper machine of Fig. 2 with a soldered metal mold part,
Fig.4 eine Aufsicht auf die vom Papiersieb abgehobene und mithilfe des Metallformteils der Fig. 3 mit Dünnstellen versehene Papierbahn,4 shows a plan view of the lifted off from the paper wire and provided by means of the metal mold part of FIG. 3 with thin spots paper web,
Fig.5 einen Querschnitt durch die Papierbahn von Fig. 4 entlang der5 shows a cross section through the paper web of Fig. 4 along the
Linie V-V, undLine V-V, and
Fig. 6 einen Querschnitt der Papierbahn von Fig. 5 nach dem Herauslösen des von den Dünnstellen begrenzten Bereichs.Fig. 6 shows a cross section of the paper web of Fig. 5 after the dissolution of the area bounded by the thin areas.
Die Erfindung wir nun am Beispiel eines Sicherheitspapiers für eine Banknote erläutert. Fig. 1 zeigt dazu eine schematische Darstellung einer Banknote 10 mit einer durchgehenden Öffnung 12, die durch einen transparenten Folienstreifen 16 verschlossen ist. Die durchgehende Öffnung 12 wurde dabei während der Herstellung des für die Banknote 10 verwendeten Sicherheitspapiers erzeugt und weist einen faserigen, unregelmäßigen Randbereich 14 auf. Ein solcher Rand 14 ist charakteristisch für bereits bei der Blattbildung hergestellte Öffnungen und kann nicht nachträglich durch Stanzen oder Schneiden des Papiers erzeugt werden.The invention will now be explained using the example of a security paper for a banknote. 1 shows a schematic representation of a banknote 10 with a through opening 12, which is closed by a transparent foil strip 16. The through hole 12 was doing produced during the manufacture of the security paper used for the banknote 10 and has a fibrous, irregular edge region 14. Such a rim 14 is characteristic of openings already made in sheet formation and can not be subsequently produced by punching or cutting the paper.
Um derartige Öffnungen 12 mit komplexeren Umrissformen, wie etwa dem in Fig. 1 gezeigten Sternmotiv, reproduzierbar herstellen zu können, wird erfindungsgemäß wie nachfolgend beschrieben vorgegangen.In order to reproducibly produce such openings 12 with more complex contour shapes, such as the star motif shown in FIG. 1, the procedure according to the invention is as described below.
Fig. 2 zeigt zunächst einen Teilbereich einer Rundsiebpapiermaschine 20, wie sie für die Herstellung von Sicherheitspapieren eingesetzt wird. Fig.3 zeigt eine Aufsicht auf einen Ausschnitt des Rundsiebs 22 der Papiermaschine 20. Die Rundsiebpapiermaschine 20 umfasst neben dem Rundsieb 22 eine Ab- nahmerolle 24, über die ein Abnahmefilz 26 gespannt ist. Um die Öffnungen 12 zu erzeugen, sind auf Rundsieb 22 linienförmige Metallformteile 28 gelötet, die eine geschlossene Kurve in Form des Umrisses der zu erzeugenden Öffnung, beispielsweise des Sternmotivs 12 der Fig. 1, bilden.Fig. 2 shows first a portion of a round screening paper machine 20, as it is used for the production of security papers. 3 shows a plan view of a section of the round screen 22 of the paper machine 20. The round screen paper machine 20 comprises, in addition to the round screen 22, a pickup roller 24, via which a pick-up felt 26 is stretched. In order to produce the openings 12, line-shaped metal moldings 28 are soldered onto round sieve 22, which form a closed curve in the form of the outline of the opening to be produced, for example the star motif 12 of FIG.
Beim Eintauchen des Rundsiebs 22 in die Papiermasse 30 wird die Blattbildung im Bereich der Metallformteile 28 lokal behindert. Wie in der Aufsicht auf die erzeugte Papierbahn 32 der Fig.4 und dem Querschnitt der Fig. 5 zu erkennen, werden auf diese Weise in der Papierbahn 32 Dünnstellen 34 in Gestalt der Metallformteile 28 und damit in Gestalt des gewünschten Umris- ses erzeugt.When immersing the round screen 22 in the paper pulp 30, the sheet formation in the region of the metal moldings 28 is locally hindered. As can be seen in the plan view of the generated paper web 32 of FIG. 4 and the cross section of FIG. 5, thin spots 34 in the form of the metal moldings 28 and thus in the form of the desired outline are produced in the paper web 32 in this manner.
Die Höhe der linienf örmigen Metallformteile 28 ist dabei so gewählt, dass im Bereich der Dünnstellen 34 nach der Blattbildung nur wenige Fasern übereinander liegen, jedoch kein durchgehendes Loch in der Papierbahn erzeugt wird. Im Bereich der Dünnstellen 34 hat die Papierbahn daher nur eine geringe anfängliche Festigkeit, so dass die Dünnstellen 34 Sollbruchstellen darstellen. Andererseits ist die Papierbahn auch im Bereich der Dünnstellen 34 durchgehend, so dass die von diesen gebildete Umrissform bei der Abnahme der noch nassen Papierbahn von dem Rundsieb 22 nicht verrutscht.The height of the line-shaped metal moldings 28 is selected so that in the region of the thin spots 34 after sheet formation only a few fibers are superimposed, but does not produce a continuous hole in the paper web becomes. In the area of the thin spots 34, the paper web therefore has only a low initial strength, so that the thin spots represent predetermined breaking points. On the other hand, the paper web is also continuous in the area of the thin spots 34, so that the outline shape formed by them does not slip off the round screen 22 when the still wet paper web is taken off.
Nach der Blattbildung wird die Papierbahn 32 in der Pressenpartie entwässert. Während dieses Vorgangs wirken Kräfte senkrecht zur Papierbahnausdehnung (Pfeil 36), die den von den als Sollbruchstellen wirkenden Dünn- stellen 34 begrenzten inneren Bereich aus der noch feuchten Papierbahn heraustrennen. Es entsteht eine durchgehende Öffnung 12 mit charakteristischen Randunregelmäßigkeiten 38 (Fig. 6), deren Gestalt durch die von den Dünnstellen 34 gebildete Umrisskontur und damit durch die Gestalt der Metallformteile 28 bestimmt ist.After sheet formation, the paper web 32 is dewatered in the press section. During this process, forces act perpendicular to the paper web extension (arrow 36), which cut out the inner region delimited by the thin points 34 acting as predetermined breaking points from the still moist paper web. The result is a continuous opening 12 with characteristic Randunregelmäßigkeiten 38 (Fig. 6), whose shape is determined by the outline contour formed by the thin spots 34 and thus by the shape of the metal moldings 28.
Auf diese Weise wird die Kontur der Öffnung 12 in der weiterlaufenden Papierbahn reproduzierbar erzeugt, ohne von Schwankungen in der Blattbildung und der inhärenten Beweglichkeit des nassen Faserstoffes negativ be- einflusst zu werden.In this way, the contour of the opening 12 in the continuous paper web is generated reproducibly, without being adversely affected by fluctuations in the sheet formation and the inherent mobility of the wet pulp.
Im Ausführungsbeispiel der Fig.3 weisen die Metallformteile 28 eine Strichstärke von 2 mm und eine Höhe von 1 mm auf. Es versteht sich, dass je nach der gewünschten Unregelmäßigkeit des Randverlaufs, der Größe des Motivs oder den Eigenschaften der Papiermasse auch andere Werte für die Strich- stärke oder die Formteilhöhe infrage kommen. Auch können die Formteile 28 statt aus Metall auch aus einem harten Kunststoff gefertigt werden, oder sie können durch eine im zähen Zustand auf das Sieb aufgebracht und nachfolgend ausgehärtete Verschlussmasse gebildet sein. In the embodiment of Figure 3, the metal moldings 28 have a stroke width of 2 mm and a height of 1 mm. It is understood that depending on the desired irregularity of the edge profile, the size of the motif or the properties of the paper pulp, other values for the line thickness or the molding height may be considered. The molded parts 28 may also be made of a hard plastic instead of metal, or they may be applied to the wire by a tough state and subsequently hardened sealing compound may be formed.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zur Herstellung eines Sicherheitspapiers für Sicherheitsoder Wertdokumente, das zumindest eine durchgehende Öffnung mit cha- rakteristischen Unregelmäßigkeiten im Randbereich aufweist, dadurch gekennzeichnet, dass1. A method for producing a security paper for security or value documents, which has at least one through opening with characteristic irregularities in the edge region, characterized in that
- auf einem Papiersieb eine Papierbahn mit Dünnstellen in Form des Umrisses der gewünschten Gestalt der zumindest einen durchgehen- den Öffnung gebildet wird, unda paper web with thin spots in the form of the outline of the desired shape of the at least one continuous opening is formed on a paper screen, and
- die Papierbahn nach der Blattbildung entwässert wird, wobei der von den Dünnstellen begrenzte Bereich durch die auftretenden Kräfte aus der Papierbahn herausgelöst wird.- The paper web is dewatered after sheet formation, wherein the area limited by the thin areas is removed by the forces occurring from the paper web.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Papierbahn auf einem Papiersieb mit aufgebrachten linienf örmigen Formelementen gebildet wird, die während der Blattbildung zur Ausbildung der Dünnstellen in der Papierbahn führen.2. The method according to claim 1, characterized in that the paper web is formed on a papermaking screen with applied linienf örmigen form elements that lead during sheet formation to the formation of thin spots in the paper web.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die linien- f örmigen Formelemente eine im Wesentlichen geschlossene Kurve bilden.3. The method according to claim 2, characterized in that the line-shaped form elements form a substantially closed curve.
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Formelemente durch auf das Papiersieb aufgebrachte linienförmige Metalloder Kunststoff formteile gebildet sind. 4. The method according to claim 2 or 3, characterized in that the shaped elements are formed by molded onto the paper wire linear metal or plastic moldings.
5. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Formelemente durch eine mit dem Papiersieb fest verbundene linienförmige Verschlussmasse gebildet sind.5. The method according to claim 2 or 3, characterized in that the shaped elements are formed by a firmly connected to the paper wire line-shaped sealing compound.
6. Verfahren nach wenigstens einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass bei der Blattbildung Dünnstellen mit nur wenigen übereinander liegenden Fasern erzeugt werden.6. The method according to at least one of claims 1 to 5, characterized in that in the sheet formation thin areas are produced with only a few superimposed fibers.
7. Verfahren nach wenigstens einem der Ansprüche 1 bis 6, dadurch ge- kennzeichnet, dass zumindest eine durchgehende Öffnung mit einem komplexen Umriss, insbesondere in Gestalt eines graphischen Motivs erzeugt wird.7. The method according to at least one of claims 1 to 6, character- ized in that at least one through opening with a complex outline, in particular in the form of a graphic motif is generated.
8. Verfahren nach wenigstens einem der Ansprüche 1 bis 7, dadurch ge- kennzeichnet, dass die zumindest eine durchgehende Öffnung auf einer oder auf beiden Seiten des Sicherheitspapiers mit einem Folienelement verschlossen wird.8. The method according to at least one of claims 1 to 7, character- ized in that the at least one through opening is closed on one or both sides of the security paper with a film element.
9. Papiersieb für die Herstellung von Sicherheitspapier, das zumindest eine durchgehende Öffnung mit charakteristischen Unregelmäßigkeiten im9. Paper screen for the production of security paper, which has at least one continuous opening with characteristic irregularities in the
Randbereich aufweist, dadurch gekennzeichnet, dass das Papiersieb mit linienförmigen Formelementen in Form des Umrisses der zumindest einen durchgehenden Öffnung versehen ist.Having edge region, characterized in that the paper screen is provided with line-shaped elements in the form of the outline of the at least one through opening.
10. Papiersieb nach Anspruch 9, dadurch gekennzeichnet, dass die linienförmigen Formelemente eine im Wesentlichen geschlossene Kurve bilden. 10. Papiersieb according to claim 9, characterized in that the line-shaped form elements form a substantially closed curve.
11. Papiersieb nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die Formelemente durch auf das Papiersieb aufgebrachte linienförmige Metall- oder Kunststoffformteile gebildet sind.11. Papiersieb according to claim 9 or 10, characterized in that the shaped elements are formed by applied to the paper wire linear metal or plastic moldings.
12. Papiersieb nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die Formelemente durch eine mit dem Papiersieb fest verbundene linienförmige Verschlussmasse gebildet sind.12. Papiersieb according to claim 9 or 10, characterized in that the shaped elements are formed by a firmly connected to the paper wire line-shaped sealing compound.
13. Papiersieb nach Anspruch 12, dadurch gekennzeichnet, dass die Ver- Schlussmasse durch einen auf Epoxid-Harz basierenden Klebstoff, eine thermisch ausgehärtete Lotpaste oder einen UV-gehärteten Klebstoff gebildet ist.13. Paper screen according to claim 12, characterized in that the closure mass is formed by an epoxy resin-based adhesive, a thermally cured solder paste or a UV-cured adhesive.
14. Papiersieb nach wenigstens einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, dass die linienf örmigen Formelemente eine Strichstärke zwischen 0,3 mm und 5 mm, vorzugsweise zwischen 0,5 mm und 3 mm aufweisen.14. Paper screen according to at least one of claims 9 to 13, characterized in that the line-shaped form elements have a line thickness between 0.3 mm and 5 mm, preferably between 0.5 mm and 3 mm.
15. Papiersieb nach wenigstens einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, dass die linienförmigen Formelemente eine Höhe zwischen 0,5 mm und 2 mm, vorzugsweise zwischen 0,8 mm und 1,5 mm aufweisen.15. Papiersieb according to at least one of claims 9 to 14, characterized in that the line-shaped form elements have a height between 0.5 mm and 2 mm, preferably between 0.8 mm and 1.5 mm.
16. Papiersieb nach wenigstens einem der Ansprüche 9 bis 15, dadurch gekennzeichnet, dass die linienförmigen Formelemente eine Gestalt mit einem komplexen Umriss, insbesondere ein graphisches Motiv bilden.16. Paper screen according to at least one of claims 9 to 15, characterized in that the line-shaped form elements form a shape with a complex outline, in particular a graphic motif.
17. Papiersieb nach wenigstens einem der Ansprüche 9 bis 16, dadurch gekennzeichnet, dass es sich um ein Papiersieb für eine Rundsiebmaschine handelt. 17. Paper screen according to at least one of claims 9 to 16, characterized in that it is a paper screen for a rotary screening machine.
18. Formelement für ein Papiersieb für die Herstellung von Sicherheitspapier mit zumindest einer durchgehenden Öffnung mit charakteristischen Unregelmäßigkeiten im Randbereich, dadurch gekennzeichnet, dass das Formelement als linienförmiges Metall- oder Kunststoffformteil in Form des Umrisses einer zu erzeugenden durchgehenden Öffnung des Sicherheitspapiers ausgebildet ist.18. Forming element for a paper wire for the production of security paper with at least one through hole with characteristic irregularities in the edge region, characterized in that the shaped element is formed as a linear metal or plastic molded part in the form of the outline of a continuous opening to be generated of the security paper.
19. Formelement nach Anspruch 18, dadurch gekennzeichnet, dass es eine im Wesentlichen geschlossene Kurve bildet.19. A mold element according to claim 18, characterized in that it forms a substantially closed curve.
20. Formelement nach Anspruch 18 oder 19, dadurch gekennzeichnet, dass es eine Strichstärke zwischen 0,3 mm und 5 mm, vorzugsweise zwischen 0,5 mm und 3 mm aufweist.20. Forming element according to claim 18 or 19, characterized in that it has a line thickness between 0.3 mm and 5 mm, preferably between 0.5 mm and 3 mm.
21. Formelement nach wenigstens einem der Ansprüche 18 bis 20 , dadurch gekennzeichnet, dass es eine Höhe zwischen 0,5 mm und 2 mm, vorzugsweise zwischen 0,8 mm und 1,5 mm aufweist. 21. Forming element according to at least one of claims 18 to 20, characterized in that it has a height between 0.5 mm and 2 mm, preferably between 0.8 mm and 1.5 mm.
EP06762343A 2005-07-12 2006-07-03 Method for producing antifalsification papers, paper mould, and forming element for paper mould Withdrawn EP1922446A1 (en)

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PCT/EP2006/006437 WO2007006445A1 (en) 2005-07-12 2006-07-03 Method for producing antifalsification papers, paper mould, and forming element for paper mould

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BRPI0612765A2 (en) 2012-10-02
DE102005032815A1 (en) 2007-01-18
CN101208474A (en) 2008-06-25
US8083894B2 (en) 2011-12-27
WO2007006445A1 (en) 2007-01-18
RU2008103948A (en) 2009-08-20
RU2402656C2 (en) 2010-10-27
BRPI0612765B1 (en) 2017-05-09
US20090236061A1 (en) 2009-09-24

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