EP1250492B1 - Process for the manufacturing of a security document - Google Patents

Process for the manufacturing of a security document Download PDF

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Publication number
EP1250492B1
EP1250492B1 EP00988890A EP00988890A EP1250492B1 EP 1250492 B1 EP1250492 B1 EP 1250492B1 EP 00988890 A EP00988890 A EP 00988890A EP 00988890 A EP00988890 A EP 00988890A EP 1250492 B1 EP1250492 B1 EP 1250492B1
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EP
European Patent Office
Prior art keywords
substance
process according
paper
medium
protective substance
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
EP00988890A
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German (de)
French (fr)
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EP1250492A1 (en
Inventor
Jean-Michel Grimal
Maurice Perron
Christian Vieu
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Banque de France
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Banque de France
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Publication of EP1250492A1 publication Critical patent/EP1250492A1/en
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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
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/42—Paper being at least partly surrounded by the material on both sides
    • D21H23/44—Treatment with a gas or vapour

Definitions

  • the present invention relates to security or valuable documents. More specifically, the invention relates to a method for developing extremely robust fiduciary documents, in order to preserve their qualities and their specificities (for example security elements associated with the document) and / or to extend their duration of use, by especially when they are subject to an aggressive environment.
  • the invention applies generally to the production of any sensitive document comprising recognizable markings intended to enable the authentication of the document (bank note, check, any fiduciary document, security or official, etc.), and likely to be damaged.
  • markings associated with the documents To authenticate certain sensitive documents, there are known markings associated with the documents, readable by an observer or by a machine. Such markings thus constitute a security element of the document.
  • markings There are many types of marking that can be deposited on the surface of the document, or integrated into its internal structure, the marking having physical properties (optical, electrical, magnetic, etc.), chemical, or of any other nature (biological , ...) so as to allow its recognition
  • the marking must remain legible, that is to say, it must not be covered by dirt or other damage to the document that conceals it or be itself tampered with.
  • banknotes are handled and treated as everyday objects, and are commonly degraded and soiled. Such degradations may compromise the reading of the different authentication markings that the notes may contain or even make it impossible (in particular in the case of a replay by machine); this is a significant limitation of the security of the notes, and reduces their life because it is necessary for many applications to be able to authenticate the notes.
  • the object of the invention is to make it possible to produce a document comprising at least one authentication marking which constitutes a security element of the document, the authentication mark or labels being preserved from the degradations and soils in order to guarantee the security of the document. document.
  • the invention proposes a security document comprising a fibrous weft paper support, characterized in that that the fibrous web is impregnated over its entire thickness by a protective substance, so that said substance coats the fibers of the weft and covers the bonding areas of these fibers, the pores of said support being hermetically sealed by the coating.
  • a bank note is processed by first placing it in an evaporation chamber in which an extremely low pressure which can be assimilated to that of the vacuum is established.
  • This note may be a paper note with a fibrous web.
  • the crucible containing the substance is then heated, bringing it to a temperature which may be of the order of 1000 degrees centigrade, so that the substance passes into the gas phase. Once the substance is in the gas phase, it is released into the chamber and will be deposited on the ticket along a substantially straight path due to the virtual absence of pressure in the chamber.
  • a polymer of the type -xylene or SiO 2 which have advantageous hydrophobic properties.
  • the pores of the bill (whose diameter is of the order of 1 to 20 micrometers) may not be blocked by the varnish, and the quality of protection is in this case bad.
  • the protective substance impregnates the fibrous web of the paper over its entire thickness, so that the fibers of this weft are coated with the substance, and the binding between these fibers are also covered by this substance.
  • the Applicant has in particular carried out quantification tests on the evolution of whiteness at the level of the banknote watermark; such a test consists of an accelerated aging of the note (exposure to water and dirt %) and an optical determination of the whiteness of the paper.
  • the Applicant has also carried out life tests (based on the characterization of the mechanical state of the note after accelerated aging).
  • life tests based on the characterization of the mechanical state of the note after accelerated aging.
  • the varnished ticket made it possible to obtain a gain of the order of a few tens of percent compared to an untreated ticket, whereas in the case of a ticket treated according to the invention, the gain was the order of a few hundred percent, typically corresponding to a tripling of the life of the note.
  • the bill is placed in a plasma chamber within which a pressure close to that of the vacuum has been established, the target being able to be made of metal, for example silicon, the plasma being able to consist of a mixture of Argon and Oxygen. Bombarded by the oxygen ions, the target emits silicon particles that will combine on the surface of the ticket with oxygen ions to form silicon oxide SiO 2 (this combination is not realized in the absence solid support).
  • the note is also possible to coat the note by chemical vapor deposition (a method known as the Anglo-Saxon "chemical vapor deposition").
  • the note is exposed to the vapor phase substance (which thus forms a gaseous precursor), the vapor condensing on contact with the note to form a deposit on the note.
  • This embodiment also makes it possible to obtain a very good impregnation of the note by coating the fibers and thus clogging the pores of the paper, the gaseous precursor being able to diffuse in all the free volumes and to condense on all the exposed surfaces.
  • the substance coating must be thick enough to provide an effective and durable barrier; in practice, the thickness equivalent to the amount of deposited material (that is to say the thickness that would form the amount of substance actually deposited on a perfectly flat support and non-porous) must be of the order of a few micrometers for example from 0.2 to 30 micrometers.
  • the substances used for coating the fiber fibrous structure of the note are generally optically transparent, it is also possible to take advantage of the optical characteristics (coloring, etc.) of certain coating substances to obtain an aesthetic effect. advantageous on a ticket processed according to the invention.

Abstract

The invention concerns a security document comprising a support consisting of a sheet of paper with fibrous texture, characterised in that the fibrous texture is impregnated over its entire thickness with a protective substance, such that said substance provides a coating for the fibres of the texture and covers the binding zones of said fibres, the pores of said support being hermetically closed by the coating.

Description

La présente invention concerne les documents de sécurité ou de valeur. Plus précisément, l'invention concerne un procédé permettant d'élaborer des documents fiduciaires extrêmement robustes, afin de préserver leurs qualités et leurs spécificités (par exemple des éléments de sécurité associés au document) et/ou de prolonger leur durée d'utilisation, en particulier lorsque ceux-ci sont soumis à un environnement agressif.The present invention relates to security or valuable documents. More specifically, the invention relates to a method for developing extremely robust fiduciary documents, in order to preserve their qualities and their specificities (for example security elements associated with the document) and / or to extend their duration of use, by especially when they are subject to an aggressive environment.

Une application particulièrement avantageuse de l'invention, qui sera développée à titre d'exemple dans ce texte, concerne les billets de banque.A particularly advantageous application of the invention, which will be developed by way of example in this text, relates to banknotes.

Toutefois cet exemple n'est pas limitatif, l'invention s'appliquant de manière générale à la réalisation de tout document sensible comprenant des marquages reconnaissables destinés à permettre l'authentification du document (billet de banque, chèque, tout document fiduciaire, de sécurité ou officiel, etc..), et susceptible d'être endommagé.However, this example is not limiting, the invention applies generally to the production of any sensitive document comprising recognizable markings intended to enable the authentication of the document (bank note, check, any fiduciary document, security or official, etc.), and likely to be damaged.

Pour permettre d'authentifier certains documents sensibles, on connaît des marquages associés aux documents, lisibles par un observateur ou par une machine. De tels marquages constituent ainsi un élément de sécurité du document. Il existe de très nombreux types de marquage pouvant être déposés sur la surface du document, ou intégrés dans sa structure interne, le marquage ayant des propriétés physiques (optique, électrique, magnétique...), chimiques, ou de tout autre nature (biologique, ...) de manière à permettre sa reconnaissanceTo authenticate certain sensitive documents, there are known markings associated with the documents, readable by an observer or by a machine. Such markings thus constitute a security element of the document. There are many types of marking that can be deposited on the surface of the document, or integrated into its internal structure, the marking having physical properties (optical, electrical, magnetic, etc.), chemical, or of any other nature (biological , ...) so as to allow its recognition

Pour assurer sa fonction d'élément de sécurité, le marquage doit demeurer lisible, c'est-à-dire qu'il ne doit ni être recouvert par des salissures ou autres dégradations du document qui le dissimulent ni être lui-même altéré.To ensure its function of security element, the marking must remain legible, that is to say, it must not be covered by dirt or other damage to the document that conceals it or be itself tampered with.

Or dans le cas des documents sensibles comportant de tels marquages, et destinés à être mis en oeuvre dans des environnements agressifs, les marquages sont susceptibles d'être ainsi rendus illisibles, ce qui constitue un inconvénient en termes de sécurité.But in the case of sensitive documents with such markings, and intended to be implemented in aggressive environments, the markings are likely to be rendered illegible, which is a disadvantage in terms of security.

Par exemple, les billets de banque sont manipulés et traités comme des objets usuels, et subissent couramment des dégradations et salissures. De telles dégradations peuvent compromettre la lecture des différents marquages d'authentification que peuvent comporter les billets ou même la rendre impossible (en particulier dans le cas d'une relecture par machine) ; ceci constitue une limitation importante de la sécurité des billets, et réduit leur durée de vie car il est nécessaire pour de nombreuses applications de pouvoir authentifier les billets.For example, banknotes are handled and treated as everyday objects, and are commonly degraded and soiled. Such degradations may compromise the reading of the different authentication markings that the notes may contain or even make it impossible (in particular in the case of a replay by machine); this is a significant limitation of the security of the notes, and reduces their life because it is necessary for many applications to be able to authenticate the notes.

Les billets et documents traditionnels en papier peuvent à cet égard se révéler peu performants. Et étant donné l'importance croissante des éléments de sécurité dans les billets - mais également dans de nombreux types de documents - cette limitation constitue un inconvénient important.In this respect, traditional paper banknotes and documents may be underperforming. And given the growing importance of security features in banknotes - but also in many types of documents - this limitation is a significant disadvantage.

Pour tenter de résoudre cet inconvénient, il est connu de mettre en oeuvre des techniques classiques d'impression pour déposer un vernis de protection sur la surface d'un billet en papier. Voir par example US-A-5660919.In an attempt to overcome this drawback, it is known to use conventional printing techniques to deposit a protective varnish on the surface of a paper ticket. See, for example, US-A-5660919.

Mais on constate que l'efficacité d'un tel procédé est très limitée et que si l'impression par vernis peut être relativement efficace contre les salissures, une telle protection résiste mal à l'usure mécanique du billet. En particulier, dans le cas de billets circulant dans un environnement humide, le billet n'est pas préservé des dégradations, notamment celles provoquées par l'eau (projections d'eau, impuretés déposées dans la trame du billet par l'air humide, ...).However, it can be seen that the effectiveness of such a method is very limited and that if the coating printing can be relatively effective against soiling, such protection badly resists the mechanical wear of the note. In particular, in the case of tickets circulating in a humid environment, the ticket is not preserved from damage, especially those caused by water (splashing water, impurities deposited in the net of the ticket by moist air, ...).

On pourrait également envisager de réaliser des billets dont la structure même serait à base de polymères, mais les procédés connus pour imprimer, et de manière plus générale intégrer des marquages de sécurité sont mal adaptés à la sécurisation de tels billets et conduisent donc à des documents dont la sécurité est médiocre.One could also consider making tickets whose structure itself would be based on polymers, but known methods for printing, and more generally incorporate security markings are poorly suited to securing such notes and therefore lead to documents whose security is poor.

Le but de l'invention est de permettre de réaliser un document comportant au moins un marquage d'authentification qui constitue un élément de sécurité du document, le ou les marquages d'authentification étant préservés des dégradations et salissures de manière à garantir la sécurité du document.The object of the invention is to make it possible to produce a document comprising at least one authentication marking which constitutes a security element of the document, the authentication mark or labels being preserved from the degradations and soils in order to guarantee the security of the document. document.

Afin d'atteindre ce but, l'invention propose une document de sécurité comprenant un support en feuille de papier à trame fibreuse, caractérisé en ce que la trame fibreuse est imprégnée sur toute son épaisseur par une substance protectrice, de sorte que ladite substance enrobe les fibres de la trame et recouvre les zones de liaison de ces fibres, les pores dudit support étant hermétiquement bouchés par l'enrobage.In order to achieve this object, the invention proposes a security document comprising a fibrous weft paper support, characterized in that that the fibrous web is impregnated over its entire thickness by a protective substance, so that said substance coats the fibers of the weft and covers the bonding areas of these fibers, the pores of said support being hermetically sealed by the coating.

Des aspects préférés, mais non limitatifs du document de sécurité selon l'invention sont les suivants :

  • la substance protectrice comprend une substance organique.
  • la substance organique est un silane, un silane fluoré, un polymère de type -xylène, ou un autre polymère.
  • la substance protectrice comprend une substance inorganique.
  • la substance inorganique est du SiO2, du Si3N4, du TiO2, du ZnO ou du SnO2
  • la substance protectrice a été déposée sur le support en feuille de papier par évaporation sous vide.
  • la substance protectrice a été déposée sur le support en feuille de papier par décomposition d'un plasma sur la surface du support.
  • la décomposition du plasma a lieu sous une pression proche de celle du vide.
  • la substance protectrice a été déposée sur le support en feuille de papier par dépôt chimique en phase vapeur.
  • la substance protectrice a été déposée sur le support en feuille de papier par imprégnation du support par une solution de viscosité faible puis réalisation d'une étape de recuit permettant de figer la solution dans la trame du support.
  • l'épaisseur équivalente de l'enrobage est comprise entre 0,2 et 30 micromètres.
  • l'épaisseur équivalente de l'enrobage est comprise entre 1 et 5 micromètres.
  • la substance protectrice est colorée.
Preferred but non-limiting aspects of the security document according to the invention are the following:
  • the protective substance comprises an organic substance.
  • the organic substance is a silane, a fluorinated silane, a polymer of the -xylene type, or another polymer.
  • the protective substance comprises an inorganic substance.
  • the inorganic substance is SiO 2 , Si 3 N 4 , TiO 2 , ZnO or SnO 2
  • the protective substance was deposited on the paper sheet support by vacuum evaporation.
  • the protective substance was deposited on the paper sheet support by decomposition of a plasma on the surface of the support.
  • the decomposition of the plasma takes place under a pressure close to that of the vacuum.
  • the protective substance was deposited on the paper sheet support by chemical vapor deposition.
  • the protective substance was deposited on the paper sheet support by impregnation of the support with a solution of low viscosity and then performing an annealing step to freeze the solution in the frame of the support.
  • the equivalent thickness of the coating is between 0.2 and 30 micrometers.
  • the equivalent thickness of the coating is between 1 and 5 micrometers.
  • the protective substance is colored.

D'autres aspects, buts et avantages de l'invention apparaîtront mieux à la lecture de la description suivante de différentes formes de réalisation de l'invention.Other aspects, objects and advantages of the invention will become more apparent upon reading the following description of various embodiments of the invention.

Selon un premier mode de réalisation de l'invention, on procède au traitement d'un billet de banque en le plaçant dans un premier temps dans une enceinte d'évaporation dans laquelle on a établi une pression extrêmement faible pouvant être assimilée à celle du vide. Ce billet peut être un billet en papier à trame fibreuse.According to a first embodiment of the invention, a bank note is processed by first placing it in an evaporation chamber in which an extremely low pressure which can be assimilated to that of the vacuum is established. . This note may be a paper note with a fibrous web.

Le billet est placé en regard d'un creuset qui contient une substance hydrophobe pouvant être :

  • organique (silane, silane fluoré, polymère de type xylène - par exemple parylène (marque déposée), autre polymère...),
  • inorganique (SiO2, Si3N4, ou bien TiO2, ZnO, SnO2 par exemple),
  • ou de type hybride organique/inorganique (mélanges de SiO2 et de silanes fluorés, ou autre)
The note is placed opposite a crucible which contains a hydrophobic substance that can be:
  • organic (silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer, etc.),
  • inorganic (SiO 2 , Si 3 N 4 , or TiO 2 , ZnO, SnO 2 for example),
  • or hybrid organic / inorganic type (mixtures of SiO 2 and fluorinated silanes, or other)

On chauffe ensuite le creuset contenant la substance, en l'amenant à une température pouvant être de l'ordre de 1000 degrés centigrades, de manière à ce que la substance passe en phase gazeuse. Une fois la substance passée en phase gazeuse, il est libéré dans l'enceinte et va se déposer sur le billet selon une trajectoire sensiblement rectiligne du fait de la quasi absence de pression dans l'enceinte. Parmi les substances évoquées, on pourra utiliser un polymère de type -xylène ou du SiO2 qui ont des propriétés hydrophobes avantageuses.The crucible containing the substance is then heated, bringing it to a temperature which may be of the order of 1000 degrees centigrade, so that the substance passes into the gas phase. Once the substance is in the gas phase, it is released into the chamber and will be deposited on the ticket along a substantially straight path due to the virtual absence of pressure in the chamber. Among the substances mentioned, it will be possible to use a polymer of the type -xylene or SiO 2 which have advantageous hydrophobic properties.

Dans le cas des techniques connues d'impression de vernis sur un billet, les pores du billet (dont le diamètre est de l'ordre de 1 à 20 micromètres) peuvent ne pas être bouchés par le vernis, et la qualité de la protection est dans ce cas mauvaise.In the case of known techniques for printing varnish on a ticket, the pores of the bill (whose diameter is of the order of 1 to 20 micrometers) may not be blocked by the varnish, and the quality of protection is in this case bad.

Dans le cas du procédé d'évaporation sous vide décrit ci-dessus, au contraire, la substance protectrice imprègne la trame fibreuse du papier sur toute son épaisseur, de sorte que les fibres de cette trame sont enrobées par ladite substance, et les zones de liaison entre ces fibres sont également recouvertes par cette substance.In the case of the vacuum evaporation process described above, on the contrary, the protective substance impregnates the fibrous web of the paper over its entire thickness, so that the fibers of this weft are coated with the substance, and the binding between these fibers are also covered by this substance.

Et par ce procédé les pores du billet sont hermétiquement bouchés, ce qui accroît considérablement la qualité de la protection (en particulier contre l'humidité et les particules portées par une atmosphère humide).And by this process the pores of the bill are hermetically sealed, which greatly increases the quality of protection (especially against moisture and particles carried by a humid atmosphere).

Pour caractériser cette amélioration la Demanderesse a en particulier effectué des tests de quantification de l'évolution de la blancheur au niveau du filigrane de billets de banque ; un tel test consiste en un vieillissement accéléré du billet (exposition à l'eau et aux salissures...) et en une détermination optique de la blancheur du papier.To characterize this improvement, the Applicant has in particular carried out quantification tests on the evolution of whiteness at the level of the banknote watermark; such a test consists of an accelerated aging of the note (exposure to water and dirt ...) and an optical determination of the whiteness of the paper.

En traitant un billet selon la technique connue d'impression de vernis, les résultats de blancheur étaient améliorés de quelques dizaines de pourcent par rapport à un billet non traité. En traitant le billet par dépôt d'un polymère selon un procédé tel que décrit ci-dessus, l'amélioration était considérablement supérieure.By processing a ticket according to the known varnish printing technique, the whiteness results were improved by a few tens of percent compared to an untreated ticket. By treating the note by depositing a polymer according to a method as described above, the improvement was considerably greater.

La Demanderesse a également effectué des tests de durée de vie (se fondant sur la caractérisation de l'état mécanique du billet après un vieillissement accéléré). Dans ce cas encore, le billet vernis permettait d'obtenir un gain de l'ordre de quelques dizaines de pourcent par rapport à un billet non traité, alors que dans le cas d'un billet traité selon l'invention, le gain était de l'ordre de quelques centaines de pourcent , correspondant typiquement à un triplement de la durée de vie du billet.The Applicant has also carried out life tests (based on the characterization of the mechanical state of the note after accelerated aging). In this case again, the varnished ticket made it possible to obtain a gain of the order of a few tens of percent compared to an untreated ticket, whereas in the case of a ticket treated according to the invention, the gain was the order of a few hundred percent, typically corresponding to a tripling of the life of the note.

Il est également possible selon l'invention de réaliser un enrobage des fibres de la trame d'un billet permettant de boucher les pores du billet et d'améliorer ainsi de manière très significative sa robustesse, en effectuant un dépôt sous vide par pulvérisation d'une cible soumise au bombardement d'ions issus d'un plasma.It is also possible according to the invention to perform a coating of the fibers of the weft of a ticket to clog the pores of the note and thus significantly improve its robustness, by performing a vacuum deposition by spraying. a target subjected to the bombardment of ions from a plasma.

Dans ce cas, le billet est placé dans une chambre à plasma à l'intérieur de laquelle on a établi une pression proche de celle du vide, la cible pouvant être réalisée en métal, par exemple en silicium, le plasma pouvant être constitué d'un mélange d'Argon et d'Oxygène. Bombardée par les ions d'oxygène, la cible émet des particules de silicium qui vont se combiner sur la surface du billet aux ions d'oxygène pour former de l'oxyde de silicium SiO2 (cette combinaison ne se réalisant pas en l'absence de support solide).In this case, the bill is placed in a plasma chamber within which a pressure close to that of the vacuum has been established, the target being able to be made of metal, for example silicon, the plasma being able to consist of a mixture of Argon and Oxygen. Bombarded by the oxygen ions, the target emits silicon particles that will combine on the surface of the ticket with oxygen ions to form silicon oxide SiO 2 (this combination is not realized in the absence solid support).

On notera par ailleurs qu'il est possible de réaliser un dépôt de substance sur un billet par création d'un plasma dans une enceinte dont la pression n'est pas proche de celle du vide, mais plus importante, voire proche de la pression atmosphérique.Note also that it is possible to make a deposit of substance on a ticket by creating a plasma in an enclosure whose pressure is not close to that of the vacuum, but more important, even close to the atmospheric pressure.

Selon une autre forme de réalisation de l'invention, on peut également procéder à l'enrobage du billet par dépôt chimique en phase vapeur (méthode connue sous le terme anglo-saxon de « chemical vapor deposition »). Dans ce cas, le billet est exposé à la substance en phase vapeur (qui forme ainsi un précurseur gazeux), la vapeur se condensant au contact du billet pour former un dépôt sur le billet.According to another embodiment of the invention, it is also possible to coat the note by chemical vapor deposition (a method known as the Anglo-Saxon "chemical vapor deposition"). In this case, the note is exposed to the vapor phase substance (which thus forms a gaseous precursor), the vapor condensing on contact with the note to form a deposit on the note.

Cette forme de réalisation permet également d'obtenir une très bonne imprégnation du billet par enrobage des fibres et ainsi un bouchage des pores du papier, le précurseur gazeux pouvant diffuser dans tous les volumes libres et se condenser sur toutes les surfaces exposées.This embodiment also makes it possible to obtain a very good impregnation of the note by coating the fibers and thus clogging the pores of the paper, the gaseous precursor being able to diffuse in all the free volumes and to condense on all the exposed surfaces.

Il est à noter que le dernier procédé mentionné ci-dessus doit être mis en oeuvre à des températures ne dépassant pas une limite haute de l'ordre de 200 degrés centigrades, de manière à ne pas endommager le papier (déformation ou autre altération). Cette forme de réalisation de l'invention peut être mise en oeuvre à pression atmosphérique, ou à pression réduite.It should be noted that the last process mentioned above must be carried out at temperatures not exceeding a high limit of the order of 200 degrees centigrade, so as not to damage the paper (deformation or other alteration). This embodiment of the invention can be implemented at atmospheric pressure, or at reduced pressure.

Enfin, il est également possible de mettre en oeuvre l'invention par un dépôt de type « solution-gel » lors duquel on trempe le billet dans une solution de viscosité suffisamment basse pour que la trame du billet soit totalement imprégnée, puis on effectue un recuit du billet ainsi imprégné pour figer la solution dans la trame du papier du billet. Ce procédé est particulièrement bien adapté à la mise en oeuvre de substances hybrides pour revêtir la surface du billet.Finally, it is also possible to implement the invention by a deposit of the "gel-solution" type, in which the billet is dipped in a solution of sufficiently low viscosity so that the weft of the note is completely impregnated, and then a reaction is carried out. annealing the ticket so impregnated to freeze the solution in the weft of the note paper. This method is particularly well suited to the use of hybrid substances for coating the surface of the note.

Les différentes formes de réalisation de l'invention décrites ci-dessus permettent de déposer sur la structure en trame fibreuse du billet une substance d'enrobage protectrice qui obture totalement les pores du papier et constitue ainsi une barrière extrêmement efficace contre l'humidité et les salissures comme les tests effectués par la Demanderesse l'ont montré. De plus, un tel enrobage permet d'augmenter considérablement la robustesse mécanique du billet.The various embodiments of the invention described above make it possible to deposit on the fibrous weft structure of the ticket a protective coating substance which completely closes the pores of the paper and thus constitutes an extremely effective barrier against moisture and moisture. soils as the tests carried out by the Applicant have shown. In addition, such a coating makes it possible to considerably increase the mechanical strength of the note.

L'enrobage de substance doit être assez épais pour constituer une barrière efficace et durable ; en pratique, l'épaisseur équivalente à la quantité de matière déposée (c'est-à-dire l'épaisseur que formerait la quantité de substance effectivement déposée sur un support parfaitement plan et non poreux) doit être de l'ordre de quelques micromètres, par exemple de 0,2 à 30 micromètres.The substance coating must be thick enough to provide an effective and durable barrier; in practice, the thickness equivalent to the amount of deposited material (that is to say the thickness that would form the amount of substance actually deposited on a perfectly flat support and non-porous) must be of the order of a few micrometers for example from 0.2 to 30 micrometers.

Toutefois, il est possible d'appliquer efficacement l'invention avec des enrobages d'épaisseur inférieure pour certaines substances (par exemple épaisseur équivalente de l'ordre de 5 micromètres voire 1 micromètre dans le cas de polymères de type -xylène qui présentent des caractéristiques avantageuses d'étanchéité et de tenue mécanique dès ces épaisseurs réduites).However, it is possible to effectively apply the invention with coatings of lower thickness for certain substances (for example equivalent thickness of the order of 5 microns or even 1 micrometer in the case of polymers of the -xylene type which have characteristics advantageous sealing and mechanical strength as soon as these reduced thicknesses).

On notera également que si les substances utilisées pour l'enrobage de la structure de trame fibreuse du billet sont généralement optiquement transparents, on peut également tirer profit des caractéristiques optiques (coloration ...) de certaines substances d'enrobage pour obtenir un effet esthétique avantageux sur un billet traité selon l'invention.It will also be noted that if the substances used for coating the fiber fibrous structure of the note are generally optically transparent, it is also possible to take advantage of the optical characteristics (coloring, etc.) of certain coating substances to obtain an aesthetic effect. advantageous on a ticket processed according to the invention.

Claims (13)

  1. Process for producing security documents comprising a medium made of a sheet of paper having a fibrous texture, characterized in that the process comprises the impregnation of said fibrous texture over its entire thickness with a protective substance, so that said substance coats the fibres of the texture and covers the areas of bonding of these fibres, the pores of said medium being hermetically closed off by the coating.
  2. Process according to Claim 1, characterized in that the protective substance comprises an organic substance.
  3. Process according to the preceding claim, characterized in that the organic substance is a silane, a fluorosilane, a xylene-type polymer or another polymer.
  4. Process according to one of the preceding claims, characterized in that the protective substance comprises an inorganic substance.
  5. Process according to Claim 4, characterized in that the inorganic substance is SiO2, Si3N4, TiO2, ZnO or SnO2.
  6. Process according to one of the preceding claims, characterized in that the protective substance is deposited on the medium made of a sheet of paper by vacuum evapouration.
  7. Process according to one of Claims 1 to 5, characterized in that the protective substance is deposited on the medium made of a sheet of paper by decomposition of a plasma on the surface of the medium.
  8. Process according to Claim 7, characterized in that the decomposition of the plasma takes place at a pressure close to that of a vacuum.
  9. Process according to one of Claims 1 to 5,
    characterized in that the protective substance is deposited on the medium made of a sheet of paper by chemical vapour deposition.
  10. Process according to one of Claims 1 to 5,
    characterized in that the protective substance is deposited on the medium made of a sheet of paper by impregnating the medium with a solution having a low viscosity and then by carrying out an annealing step allowing the solution to be fixed in the texture of the medium.
  11. Process according to one of the preceding claims, characterized in that the equivalent thickness of the coating is between 0.2 and 30 microns.
  12. Process according to Claim 11, characterized in that the equivalent thickness of the coating is between 1 and 5 microns.
  13. Process according to one of the preceding claims, characterized in that the protective substance is coloured.
EP00988890A 1999-12-07 2000-12-07 Process for the manufacturing of a security document Expired - Lifetime EP1250492B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9915386A FR2801910B1 (en) 1999-12-07 1999-12-07 SAFETY DOCUMENT MANUFACTURED WITH PAPER WITH A FIBROUS WEB COATED BY A PROTECTIVE SUBSTANCE
FR9915386 1999-12-07
PCT/FR2000/003426 WO2001042563A1 (en) 1999-12-07 2000-12-07 Security document

Publications (2)

Publication Number Publication Date
EP1250492A1 EP1250492A1 (en) 2002-10-23
EP1250492B1 true EP1250492B1 (en) 2006-05-31

Family

ID=9552950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00988890A Expired - Lifetime EP1250492B1 (en) 1999-12-07 2000-12-07 Process for the manufacturing of a security document

Country Status (11)

Country Link
EP (1) EP1250492B1 (en)
AT (1) ATE328154T1 (en)
AU (1) AU2524001A (en)
DE (1) DE60028418T2 (en)
ES (1) ES2261269T3 (en)
FR (1) FR2801910B1 (en)
MA (1) MA25878A1 (en)
MD (1) MD3349B2 (en)
NO (1) NO20022695L (en)
OA (1) OA12207A (en)
WO (1) WO2001042563A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10143523B4 (en) * 2001-09-05 2008-08-21 Hueck Folien Gesellschaft M.B.H. Process for the preparation of a selectively metallised film

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2342643A (en) * 1941-05-10 1944-02-29 Guardite Corp Method of impregnating fabric sheet material
US4789564A (en) * 1987-03-31 1988-12-06 Union Carbide Corporation Hydridoaminosilane treatment for rendering surfaces water-repellent
FR2668507B1 (en) * 1990-02-09 1996-06-21 Arjomari Europ SHEET FOR SECURITY DOCUMENTS, HAVING A HIGH PRINTABILITY AT THE SAME TIME AS A RESISTANCE TO HIGH TRAFFIC.

Also Published As

Publication number Publication date
MD20020161A (en) 2003-01-31
ATE328154T1 (en) 2006-06-15
MA25878A1 (en) 2003-10-01
DE60028418T2 (en) 2006-12-21
ES2261269T3 (en) 2006-11-16
FR2801910A1 (en) 2001-06-08
FR2801910B1 (en) 2002-02-22
DE60028418D1 (en) 2006-07-06
WO2001042563A1 (en) 2001-06-14
NO20022695D0 (en) 2002-06-06
EP1250492A1 (en) 2002-10-23
OA12207A (en) 2006-05-09
NO20022695L (en) 2002-08-05
MD3349B2 (en) 2007-06-30
AU2524001A (en) 2001-06-18

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