EP1250492A1 - Security document - Google Patents

Security document

Info

Publication number
EP1250492A1
EP1250492A1 EP00988890A EP00988890A EP1250492A1 EP 1250492 A1 EP1250492 A1 EP 1250492A1 EP 00988890 A EP00988890 A EP 00988890A EP 00988890 A EP00988890 A EP 00988890A EP 1250492 A1 EP1250492 A1 EP 1250492A1
Authority
EP
European Patent Office
Prior art keywords
security document
document according
substance
support
paper
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.)
Granted
Application number
EP00988890A
Other languages
German (de)
French (fr)
Other versions
EP1250492B1 (en
Inventor
Jean-Michel Grimal
Maurice Perron
Christian Vieu
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.)
Banque de France
Original Assignee
Banque de France
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 Banque de France filed Critical Banque de France
Publication of EP1250492A1 publication Critical patent/EP1250492A1/en
Application granted granted Critical
Publication of EP1250492B1 publication Critical patent/EP1250492B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 making it possible to prepare 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 these are subjected to an aggressive environment.
  • markings associated with the documents are known, 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 (optical, electrical, magnetic %), chemical, or any other nature (biological) properties. , ...) so as to allow its recognition
  • the marking must remain legible, that is to say that it must neither be covered by dirt or other damage to the document which conceals it nor be itself altered.
  • banknotes are handled and treated like ordinary objects, and are commonly damaged and soiled. Such degradations can compromise the reading of the various authentication markings that tickets may include or even make it impossible (in particular in the case of machine re-reading), this constitutes an important limitation of ticket security, and reduces their lifetime because it is necessary for many applications to be able to authenticate banknotes
  • 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 marking or marks being preserved from degradation and soiling so as to guarantee the security of the document
  • the invention provides a security document comprising a support made of a sheet of paper with a fibrous weft, characterized in that the fibrous weft is impregnated over its entire thickness with 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
  • 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 includes an inorganic substance the inorganic substance is S ⁇ O 2 , S ⁇ 3 N 4 , T ⁇ O 2 , ZnO or
  • the protective substance was deposited on the support in paper sheet by vacuum evaporation the protective substance was deposited on the support in paper sheet 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 vacuum the protective substance was deposited on the support in sheet of paper by chemical vapor deposition the protective substance was deposited on the support in sheet of paper by impregnation of the support by a solution of low viscosity then carrying out an annealing step allowing the solution to be frozen in the frame of the support
  • a banknote is processed by first placing it in an evaporation chamber in which an extremely low pressure has been established which can be assimilated to that of the vacuum
  • This ticket can be a fibrous weft paper ticket
  • the bill is placed next to a crucible which contains a hydrophobic substance which can be
  • organic silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer
  • inorganic Silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer
  • inorganic Silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer
  • inorganic S ⁇ O 2 , S ⁇ 3 N, or else T ⁇ O 2 , ZnO, SnO 2 for example
  • type organic / inorganic hybrid mixturetures of S ⁇ 0 2 and fluorinated silanes, or other
  • the crucible containing the substance is then heated, bringing it to a temperature which can be of the order of 1000 degrees centigrade, so that the substance passes into the gas phase
  • a temperature which can be of the order of 1000 degrees centigrade, so that the substance passes into the gas phase
  • the pores of the ticket may not be blocked by the varnish, and the quality of protection is in this bad case
  • the protective substance permeates the fibrous weft of the paper over its entire thickness, so that the fibers of this weft are coated with said substance, and the bonding zones between these fibers are also covered by this substance
  • the pores of the ticket are hermetically sealed which considerably increases the quality of protection (in particular against humidity and particles carried by a humid atmosphere)
  • the Applicant has in particular carried out tests of quantification of the development of the whiteness at the level of the watermark of banknotes, such consists of an accelerated aging of the note (exposure to water and to soiling). and in an optical determination of the whiteness of the paper
  • the varnished ticket made it possible to obtain a gain of the order of a few tens percent compared to an untreated ticket, whereas in the case of a ticket processed according to the invention, the gain was of the order of a few hundred percent, typically corresponding to a tripling of the life of the ticket
  • the bill is placed in a plasma chamber inside which a pressure close to that of 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 Bombed by oxygen ions, the target emits silicon particles which will combine on the surface of the banknote with oxygen ions to form I silicon oxide S ⁇ O 2 (this combination does not not realized in the absence of solid support)
  • the ticket is also possible to coat the ticket by chemical vapor deposition (method known by the English term "chemical vapor deposition")
  • chemical vapor deposition method known by the English term "chemical vapor deposition”
  • the ticket is exposed to the substance in the vapor phase (which thus forms a gaseous precursor), the vapor condensing on contact with the ticket to form a deposit on the ticket
  • This embodiment also makes it possible to obtain a very good impregnation of the ticket by coating the fibers and thus a blockage of 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 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 humidity and soiling as the tests carried out by the Applicant have shown.
  • a protective coating substance which completely closes the pores of the paper and thus constitutes an extremely effective barrier against humidity and soiling as the tests carried out by the Applicant have shown.
  • such a coating makes it possible to considerably increase the mechanical robustness of the ticket.
  • the substance coating must be thick enough to constitute an effective and durable barrier; in practice, the thickness equivalent to the quantity of material deposited (that is to say the thickness that would form the quantity of substance actually deposited on a perfectly flat and non-porous support) must be of the order of a few microns , for example from 0.2 to 30 microns.
  • the substances used for coating the fibrous weft structure of the ticket are generally optically transparent, it is also possible to take advantage of the optical characteristics.

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

DOCUMENT DE SECURITE SECURITY DOCUMENT
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 making it possible to prepare 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 these are subjected 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 generally applying to the production of any sensitive document comprising recognizable markings intended to allow authentication of the document (bank note, check, any fiduciary, security document or official, etc.), and may 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 make it possible to authenticate certain sensitive documents, markings associated with the documents are known, 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 (optical, electrical, magnetic ...), chemical, or any other nature (biological) properties. , ...) 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 as a security element, the marking must remain legible, that is to say that it must neither be covered by dirt or other damage to the document which conceals it nor be itself altered.
Or dans le cas des documents sensibles comportant de tels marquages, et destinés à être mis en œuvre dans des environnements agressifs, les marquages sont susceptibles d'être ainsi rendus illisibles, ce qui constitue un inconvénient en termes de sécurité.However, in the case of sensitive documents comprising such markings, and intended to be implemented in aggressive environments, the markings are likely to be thus made illegible, which constitutes a drawback 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 billetsFor example, banknotes are handled and treated like ordinary objects, and are commonly damaged and soiled. Such degradations can compromise the reading of the various authentication markings that tickets may include or even make it impossible (in particular in the case of machine re-reading), this constitutes an important limitation of ticket security, and reduces their lifetime because it is necessary for many applications to be able to authenticate banknotes
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 importantTraditional paper tickets and documents can prove to be ineffective in this respect And given the increasing importance of security elements in banknotes - but also in many types of documents - this limitation constitutes a significant disadvantage
Pour tenter de résoudre cet inconvénient, il est connu de mettre en œuvre des techniques classiques d'impression pour déposer un vernis de protection sur la surface d'un billet en papierIn an attempt to resolve this drawback, it is known to use conventional printing techniques to deposit a protective varnish on the surface of a paper ticket.
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 process is very limited and that if varnish printing can be relatively effective against soiling, such protection does not withstand mechanical wear of the ticket in particular. tickets circulating in a humid environment, the ticket is not preserved from degradations, in particular those caused by water (water splashes, impurities deposited in the frame of the ticket by humid air,)
On pourrait également envisager de réaliser des billets dont la structure même serait à base de polymères, mais les procèdes 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 médiocreOne could also consider making tickets whose very structure would be based on polymers, but the known methods for printing, and more generally integrating security markings are ill-suited to securing such tickets 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 documentThe 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 marking or marks being preserved from degradation and soiling so as to guarantee the security of the 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'enrobageIn order to achieve this object, the invention provides a security document comprising a support made of a sheet of paper with a fibrous weft, characterized in that the fibrous weft is impregnated over its entire thickness with 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 SιO2, du Sι3N4, du TιO2, du ZnO ou duPreferred, but non-limiting aspects of the safety 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 includes an inorganic substance the inorganic substance is SιO 2 , Sι 3 N 4 , TιO 2 , ZnO or
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 supportSnO 2 the protective substance was deposited on the support in paper sheet by vacuum evaporation the protective substance was deposited on the support in paper sheet 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 vacuum the protective substance was deposited on the support in sheet of paper by chemical vapor deposition the protective substance was deposited on the support in sheet of paper by impregnation of the support by a solution of low viscosity then carrying out an annealing step allowing the solution to be frozen in the frame of the support
• l'épaisseur équivalente de l'enrobage est comprise entre 0 2 et 30 microns• the equivalent thickness of the coating is between 0 2 and 30 microns
• l'épaisseur équivalente de l'enrobage est comprise entre 1 et 5 microns• the equivalent thickness of the coating is between 1 and 5 microns
• la substance protectrice est colorée• the protective substance is colored
D'autres aspects, buts et avantages de l'invention apparaîtront mieux a la lecture de la description suivante de différentes formes de réalisation de l'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 fibreuseOther aspects, objects and advantages of the invention will appear better on reading the following description of different embodiments of the invention According to a first embodiment of the invention, a banknote is processed by first placing it in an evaporation chamber in which an extremely low pressure has been established which can be assimilated to that of the vacuum This ticket can be a fibrous weft paper ticket
Le billet est placé en regard d'un creuset qui contient une substance hydrophobe pouvant êtreThe bill is placed next to a crucible which contains a hydrophobic substance which can be
- organique (silane, silane fluoré, polymère de type xylène - par exemple parylène (marque déposée), autre polymère ), inorganique (SιO2, Sι3N , ou bien TιO2, ZnO, SnO2 par exemple), ou de type hybride organique/inorganique (mélanges de Sι02 et de silanes fluorés, ou autre)- organic (silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer), inorganic (SιO 2 , Sι 3 N, or else TιO 2 , ZnO, SnO 2 for example), or of type organic / inorganic hybrid (mixtures of Sι0 2 and fluorinated silanes, or other)
On chauffe ensuite le creuset contenant la substance, en l'amenant a 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 SιO2 qui ont des propriétés hydrophobes avantageusesThe crucible containing the substance is then heated, bringing it to a temperature which can be of the order of 1000 degrees centigrade, so that the substance passes into the gas phase Once the substance passes into the gas phase, it is released in the enclosure and will be deposited on the ticket along a substantially rectilinear trajectory due to the almost absence of pressure in the enclosure Among the substances mentioned, it is possible to use a polymer of the -xylene type or of SιO 2 which have properties advantageous hydrophobic
Dans le cas des techniques connues d'impression de vernis sur un billet, les pores du billet (dont le diamètre est de I ordre de 1 a 20 microns) peuvent ne pas être bouches par le vernis, et la qualité de la protection est dans ce cas mauvaise Dans le cas du procède 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 Et par ce procédé les pores du billet sont hermétiquement bouches ce qui accroît considérablement la qualité de la protection (en particulier contre l'humidité et les particules portées par une atmosphère humide) 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 papierIn the case of known techniques for printing varnish on a ticket, the pores of the ticket (whose diameter is of the order of 1 to 20 microns) may not be blocked by the varnish, and the quality of protection is in this bad case In the case of the vacuum evaporation process described above, on the contrary, the protective substance permeates the fibrous weft of the paper over its entire thickness, so that the fibers of this weft are coated with said substance, and the bonding zones between these fibers are also covered by this substance And by this process the pores of the ticket are hermetically sealed which considerably increases the quality of protection (in particular against humidity and particles carried by a humid atmosphere) To characterize this improvement, the Applicant has in particular carried out tests of quantification of the development of the whiteness at the level of the watermark of banknotes, such a test consists of an accelerated aging of the note (exposure to water and to soiling). and in 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 supérieureBy 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 ticket by depositing a polymer according to a process as described above. on it 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 billetThe Applicant has also carried out lifetime tests (based on the characterization of the mechanical condition of the ticket after accelerated aging) In this case again, the varnished ticket made it possible to obtain a gain of the order of a few tens percent compared to an untreated ticket, whereas in the case of a ticket processed according to the invention, the gain was of the order of a few hundred percent, typically corresponding to a tripling of the life of the ticket
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 plasmaIt is also possible according to the invention to coat the fibers of the weft of a ticket making it possible to seal the pores of the ticket and thus significantly improve its robustness, by performing vacuum deposition by spraying with a target subjected to the bombardment of ions from a plasma
Dans ce cas, le billet est placé dans une chambre a plasma a 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 I oxyde de silicium SιO2 (cette combinaison ne se réalisant pas en l'absence de support solide)In this case, the bill is placed in a plasma chamber inside which a pressure close to that of 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 Bombed by oxygen ions, the target emits silicon particles which will combine on the surface of the banknote with oxygen ions to form I silicon oxide SιO 2 (this combination does not not realized in the absence of 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 atmosphériqueNote also that it is possible to deposit a substance on a ticket by creating a plasma in an enclosure whose pressure is not close to that of vacuum, but more important, even close to 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 déposition ») 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 billetAccording to another embodiment of the invention, it is also possible to coat the ticket by chemical vapor deposition (method known by the English term "chemical vapor deposition") In this case, the ticket is exposed to the substance in the vapor phase (which thus forms a gaseous precursor), the vapor condensing on contact with the ticket to form a deposit on the ticket
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 exposéesThis embodiment also makes it possible to obtain a very good impregnation of the ticket by coating the fibers and thus a blockage of 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 œuvre 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 œuvre à pression atmosphérique, ou a pression réduiteIt should be noted that the last process mentioned above must be carried out at temperatures not exceeding an upper limit of the order of 200 degrees centigrade, so as not to damage the paper (deformation or other alteration). 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 imprègne pour figer la solution dans la trame du papier du billet Ce procède est particulièrement bien adapté à la mise en œuvre de substances hybrides pour revêtir la surface du billetFinally, it is also possible to implement the invention by a “solution-gel” type deposit during which the banknote is dipped in a solution of sufficiently low viscosity so that the screen of the banknote is completely impregnated, then a annealing of the note thus impregnated to freeze the solution in the frame of the note paper This process is particularly well suited to the use of hybrid substances to coat 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 effectues par la Demanderesse l'ont montre De plus, un tel enrobage permet d'augmenter considérablement la robustesse mécanique du billet 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 microns, par exemple de 0,2 à 30 microns.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 humidity and soiling as the tests carried out by the Applicant have shown. In addition, such a coating makes it possible to considerably increase the mechanical robustness of the ticket. The substance coating must be thick enough to constitute an effective and durable barrier; in practice, the thickness equivalent to the quantity of material deposited (that is to say the thickness that would form the quantity of substance actually deposited on a perfectly flat and non-porous support) must be of the order of a few microns , for example from 0.2 to 30 microns.
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 microns, voire 1 micron 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 micron in the case of polymers of the -xylene type which have advantageous sealing and mechanical properties from 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 optiquesIt will also be noted that if the substances used for coating the fibrous weft structure of the ticket are generally optically transparent, it is also possible to take advantage of the optical characteristics.
(coloration ...) de certaines substances d'enrobage pour obtenir un effet esthétique avantageux sur un billet traité selon l'invention. (coloring, etc.) of certain coating substances in order to obtain an advantageous aesthetic effect on a ticket treated according to the invention.

Claims

REVENDICATIONS
1 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 bouches par l'enrobage1 Security document comprising a support made of a sheet of paper with a fibrous weft, characterized in that the fibrous weft is impregnated over its entire thickness with 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
2 Document de sécurité selon la revendication 1 , caractérisé en ce que la substance protectrice comprend une substance organique2 security document according to claim 1, characterized in that the protective substance comprises an organic substance
3 Document de sécurité selon la revendication 2, caractérisé en ce que la substance organique est un silane, un silane fluoré, un polymère de type -xylène, ou un autre polymère3 security document according to claim 2, characterized in that the organic substance is a silane, a fluorinated silane, a polymer of -xylene type, or another polymer
4 Document de sécurité selon l'une des revendications précédentes, caractérisé en ce que la substance protectrice comprend une substance inorganique4 security document according to one of the preceding claims, characterized in that the protective substance comprises an inorganic substance
5 Document de sécurité selon la revendication 4, caractérisé en ce que la substance inorganique est du SιO2, du Sι3N4, du Tι02, du ZnO ou du SnO2 5 security document according to claim 4, characterized in that the inorganic substance is SιO 2 , Sι 3 N 4 , Tι0 2 , ZnO or SnO 2
6 Document de sécurité selon l'une des revendications précédentes, caractérisé en ce que la substance protectrice a été déposée sur le support en feuille de papier par evaporation sous vide6 security document according to one of the preceding claims, characterized in that the protective substance has been deposited on the support in sheet of paper by vacuum evaporation
7. Document de sécurité selon la revendication 1 à 5, caractérise en ce que la substance protectrice a été déposée sur le support en feuille de papier par décomposition d'un plasma sur la surface du support 7. Security document according to claim 1 to 5, characterized in that the protective substance has been deposited on the support in sheet of paper by decomposition of a plasma on the surface of the support
8. Document de sécurité selon la revendication 7, caractérisé en ce que la décomposition du plasma a lieu sous une pression proche de celle du vide.8. Security document according to claim 7, characterized in that the decomposition of the plasma takes place under a pressure close to that of vacuum.
9. Document de sécurité selon les revendications 1 à 5, caractérisé en ce que la substance protectrice a été déposée sur le support en feuille de papier par dépôt chimique en phase vapeur.9. Security document according to claims 1 to 5, characterized in that the protective substance has been deposited on the support of paper sheet by chemical vapor deposition.
10. Document de sécurité selon les revendications 1 à 5, caractérisé en ce que 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.10. Security document according to claims 1 to 5, characterized in that the protective substance has been deposited on the support in sheet of paper by impregnation of the support with a solution of low viscosity then carrying out an annealing step making it possible to freeze the solution in the support frame.
11. Document de sécurité selon l'une des revendications précédentes, caractérisé en ce que l'épaisseur équivalente de l'enrobage est comprise entre 0,2 et 30 microns.11. Security document according to one of the preceding claims, characterized in that the equivalent thickness of the coating is between 0.2 and 30 microns.
12 Document de sécurité selon la revendication 11 , caractérisé en ce que l'épaisseur équivalente de l'enrobage est comprise entre 1 et 5 microns.12 Security document according to claim 11, characterized in that the equivalent thickness of the coating is between 1 and 5 microns.
13. Document de sécurité selon l'une des revendications précédentes, caractérisé en ce que la substance protectrice est colorée. 13. Security document according to one of the preceding claims, characterized in that the protective substance is colored.
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 true EP1250492A1 (en) 2002-10-23
EP1250492B1 EP1250492B1 (en) 2006-05-31

Family

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EP00988890A Expired - Lifetime EP1250492B1 (en) 1999-12-07 2000-12-07 Process for the manufacturing of a security document

Country Status (11)

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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)

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* 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.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0142563A1 *

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
EP1250492B1 (en) 2006-05-31
DE60028418D1 (en) 2006-07-06
WO2001042563A1 (en) 2001-06-14
NO20022695D0 (en) 2002-06-06
OA12207A (en) 2006-05-09
NO20022695L (en) 2002-08-05
MD3349B2 (en) 2007-06-30
AU2524001A (en) 2001-06-18

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