EP1687484B1 - Multi-layer security paper - Google Patents

Multi-layer security paper Download PDF

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Publication number
EP1687484B1
EP1687484B1 EP04791542A EP04791542A EP1687484B1 EP 1687484 B1 EP1687484 B1 EP 1687484B1 EP 04791542 A EP04791542 A EP 04791542A EP 04791542 A EP04791542 A EP 04791542A EP 1687484 B1 EP1687484 B1 EP 1687484B1
Authority
EP
European Patent Office
Prior art keywords
ply
security paper
paper according
fibres
authentication
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.)
Not-in-force
Application number
EP04791542A
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German (de)
French (fr)
Other versions
EP1687484A1 (en
EP1687484B2 (en
Inventor
Henri Rosset
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.)
ArjoWiggins Security SAS
Original Assignee
ArjoWiggins Security SAS
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Application filed by ArjoWiggins Security SAS filed Critical ArjoWiggins Security SAS
Publication of EP1687484A1 publication Critical patent/EP1687484A1/en
Publication of EP1687484B1 publication Critical patent/EP1687484B1/en
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Publication of EP1687484B2 publication Critical patent/EP1687484B2/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/20—Chemically or biochemically modified fibres
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • 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
    • D21H21/18—Reinforcing agents
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree

Definitions

  • the present invention relates to a security paper and, more particularly to a security paper used in particular for the manufacture of banknotes, passports, certificates of authenticity, checks.
  • the invention also relates to the method of manufacturing said security paper.
  • These elements emit, under certain specific conditions, detectable signals, generally to the eye, the observation of said signals revealing the presence of said elements within the document and, thereby, guaranteeing its authenticity.
  • banknote for example, it is usually the watermark or some colored fibers or iridescent particles visible to the naked eye.
  • This opacification can then hinder the vision of other particles or fibers intended for authentication.
  • One of the aims of the invention is therefore to provide a security paper to increase the security level of said documents while avoiding these problems of the prior art.
  • Sheet forming problems may occur, however, when too much reinforcing material is added.
  • the Applicant has found in particular that the introduction of synthetic fibers into a fibrous layer, in order to increase its mechanical strength, degrades the quality and the rendering of a watermark formed within this layer.
  • Another object of the invention is therefore to provide a security paper to reconcile both a correct and reliable security of said documents while giving them a resistance, mechanical or chemical, suitable for its usual use.
  • the assembly of two paper layers from two separate formation jets makes it possible to obtain a fibrous structure with several layers, each layer corresponding to a jet of fibrous material, each jet having a specific dough composition.
  • the advantage of this technique is that it makes it possible to differentiate each jet according to the desired properties for each of the layers of the paper.
  • the security level of said paper is also increased, given the increased difficulty for a possible counterfeiter to reproduce such a structure.
  • this structure In addition to positioning the authentication or reinforcement elements in separate areas of the paper, this structure also has the advantage of limiting the consumption of said elements.
  • This reinforcement can be explained by the higher density of accessible authentication elements (in particular visible) in the outer layer of the multilayer structure compared to that of the single-layer structure.
  • said reinforcing element is chosen from synthetic fibers, in particular polyester or polyamide fibers, natural textile fibers, in particular abaca, hemp, flax, chinook fibers, and their mixtures.
  • said polyester fibers are polyethylene terephthalate (PET) fibers, more particularly they are present in an amount of between 10 and 20 parts by dry weight per 100 parts of the other fibers of said second jet.
  • PET polyethylene terephthalate
  • said authentication element of the first jet, and if appropriate that of the second jet, is detectable optically.
  • At least one authentication element is chosen from watermarks, iridescent particles, fibers or luminescent particles, in particular fluorescent or phosphorescent particles, colored or thermochromic fibers or particles, in particular said particles. are boards.
  • At least one authentication element reacts to certain stimulations by giving a specific detectable signal using a suitable apparatus.
  • At least one authentication element is chosen from substances that react with electromagnetic fields, in particular of the microwave type.
  • one of the jets has a thickness substantially greater than that of a jet or other jets, preferably about 1.5 to 2 times greater.
  • the first external jet comprises a watermark as an authentication element and has a thickness substantially greater than that of said second jet or other jets preferably about 1.5 to 2 times greater. Indeed, to have a good quality watermark, you need a sufficiently thick stream.
  • the first jet comprises a watermark as an authentication element and the second jet comprises said reinforcing element.
  • said reinforcing element also has an authentication function. More particularly, said reinforcing element constitutes the authentication element of said second jet.
  • said reinforcing element may be for example one of the reinforcing fibers mentioned above and which moreover would have been treated to have electromagnetic properties in general and in particular luminescent, for example magnetic or fluorescent. It may be for example a polyester fiber, in particular polyethylene terephthalate (PET) which has a reactive compound (fluorescent for example) by grafting or by addition during the extrusion of the fiber. It may also be specific metal fibers having a reinforcement and authentication function.
  • PET polyethylene terephthalate
  • the paper according to the invention includes a second ply containing said reinforcing member and said paper has a tear index greater than or equal to 10 mN * m 2 / g.
  • the jets are based (mainly) on cotton fibers.
  • the security paper is a banknote paper.
  • the security paper comprises three fibrous jets, said first external jet having an authentication element, said second jet being central and comprising said reinforcing element, and the third jet being another external jet having an authentication element that may be different from that of said first jet.
  • the invention also aims at protecting the process for obtaining said security paper, said jets being assembled in the wet phase.
  • the paper may in particular be formed on a round-shaped paper machine having two or more sheet-forming units, or a round-shaped jet and another jet (or several other jets) may be formed on a former, or the Paper can be formed on a multi-table flatbed machine.
  • the jet is formed with the watermark on a round shape with filigranous fabric and the other jet (or the other jets if necessary) on a former.
  • the basis weight of the paper obtained is 85 g / m 2 .
  • the fluorescent boards are observed in part, some being too buried in the mass of the paper.
  • the paper weight of this first series is 55 g / m 2 .
  • the paper weight of this second series is 30 g / m 2 .
  • the resulting complex is dried.
  • the paper weight of this first series is 30 g / m 2 .
  • the paper weight of this second series is 55 g / m 2 .
  • the resulting complex is dried.
  • Example 1 There are respectively 92 fluorescent boards in Example 1, 120 fluorescent boards in Example 2 and 268 fluorescent boards in Example 3.
  • Example 3 the boards and the fluorescent fibers are observed well.
  • the basis weight of the paper obtained is 85 g / m 2 .
  • PET fibers have a length of 6 mm, a diameter of 12 ⁇ m and a tenacity of 1.4 dtex.
  • the basis weight of the paper obtained is 85 g / m 2 .
  • a first series of sheets of paper is made. Filigree format square and having a surface of 310 cm 2 .
  • the paper weight of this first series is 55 g / m 2 .
  • the paper weight of this second series is 30 g / m 2 .
  • the resulting complex is dried.
  • a first series of watermarked paper sheets is produced. of square format and having an area of 310 cm 2 .
  • the paper weight of this first series is 55 g / m 2 .
  • a second series of sheets of square format having a surface area of 310 cm 2 is produced using a laboratory form apparatus from a fibrous composition containing, in dry weight, 100 parts. of cotton fibers and 12 parts fluorescent polyester fibers (PET fibers of the same characteristics as those used in Example 5) as reinforcing fibers and also acting as a second element of authentication.
  • a fibrous composition containing, in dry weight, 100 parts. of cotton fibers and 12 parts fluorescent polyester fibers (PET fibers of the same characteristics as those used in Example 5) as reinforcing fibers and also acting as a second element of authentication.
  • the paper weight of this second series is 30 g / m 2 .
  • the resulting complex is dried.
  • Example 6 It is found that the mechanical strength of the paper increases when synthetic fibers are introduced into the fibrous composition, the best results being obtained in Example 6 corresponding to the bijet paper.

Abstract

Multi-web security paper is made from at least two fibre webs - a first, outer web containing an authentification element such as a watermark, irridescent particles, fluorescent, phosphorescent or coloured fibres or particles and a second web containing a reinforcing and/or authentification element. Multi-web security paper is made from at least two fibre webs - a first, outer web containing an authentification element such as a watermark, irridescent particles, fluorescent, phosphorescent or coloured fibres or particles and a second web containing a reinforcing and/or authentification element. The second web's reinforcing element is not present in the first web, and the authentification element of the first web is not present in the second one, which is thicker than the other webs and preferably twice as thick. The authentification element in the first, and optionally the second, web is detectable by optical means or responds to certain stimuli, such as an electromagnetic and preferably microwave field, by giving out a detectable signal. The reinforcement can be provided by natural or synthetic fibres.

Description

La présente invention est relative à un papier de sécurité et, plus particulièrement à un papier de sécurité utilisé notamment pour la fabrication de billets de banque, de passeports, de certificats d'authenticité, de chèques.The present invention relates to a security paper and, more particularly to a security paper used in particular for the manufacture of banknotes, passports, certificates of authenticity, checks.

L'invention se rapporte également au procédé de fabrication dudit papier de sécurité.The invention also relates to the method of manufacturing said security paper.

Un grand nombre de documents imprimés nécessitent des moyens croissants pour assurer leur authentification et leur sécurisation.A large number of printed documents require increasing means to ensure their authentication and security.

Ces documents vont des billets de banque aux titres de transport et comprennent également des tickets de jeu grattables, des cartes à jouer, des chèques, des cartes d'identité ou des passeports.These documents range from banknotes to tickets and also include scratch-off tickets, playing cards, checks, ID cards or passports.

Pour permettre à l'utilisateur ou au détenteur du document de sécurité une vérification simple et fiable de l'authenticité de celui-ci, il est courant d'inclure dans la masse du matériau constitutif du document des éléments d'authentification.To allow the user or the holder of the security document a simple and reliable verification of the authenticity of it, it is common to include in the mass of the material constituting the document of the authentication elements.

Ces éléments émettent, dans certaines conditions spécifiques, des signaux détectables, généralement à l'oeil, l'observation desdits signaux révélant la présence desdits éléments au sein du document et, par là-même, garantissant son authenticité.These elements emit, under certain specific conditions, detectable signals, generally to the eye, the observation of said signals revealing the presence of said elements within the document and, thereby, guaranteeing its authenticity.

L'inclusion de tels éléments est également destinée à empêcher des personnes mal intentionnées de contrefaire ledit document, en reproduisant à l'identique ou quasi à l'identique les caractéristiques dudit document.The inclusion of such elements is also intended to prevent malicious persons from infringing the said document by reproducing the characteristics of said document in the same or nearly identical manner.

Les fournisseurs de documents de sécurité, constatant un accroissement du niveau d'expertise et d'organisation des contrefacteurs potentiels dans ce domaine, ont envisagé depuis quelques années d'accroître le nombre et la variété des éléments d'authentification présents au sein d'un même document de sécurité.Providers of security documents, noting an increase in the level of expertise and organization of potential counterfeiters in this area, have been considering for some years now to increase the number and variety of authentication elements present within an organization. same security document.

Les solutions envisagées à ce niveau présentent toutefois certains problèmes.The solutions envisaged at this level, however, present certain problems.

En premier lieu, la possibilité de reproduire, à l'identique ou quasi à l'identique, le document de sécurité n'est pas fondamentalement réduite de part ces ajouts supplémentaires d'éléments de sécurité.Firstly, the possibility of reproducing, identically or almost identically, the security document is not fundamentally reduced by these additional additions of security elements.

Un contrefacteur suffisamment patient et correctement équipé est en effet susceptible de découvrir la nature et la quantité exacte des éléments constituant le document à contrefaire.A counterfeiter sufficiently patient and properly equipped is indeed likely to discover the nature and the exact amount of the elements constituting the document to counterfeit.

En reproduisant les étapes d'obtention du document qui, elles, n'ont pas été modifiées, il n'est pas impossible d'aboutir à une reproduction quasi parfaite du document en question.By reproducing the steps of obtaining the document which, they have not been modified, it is not impossible to achieve an almost perfect reproduction of the document in question.

En second lieu, il peut s'avérer que cette solution ne réponde pas réellement aux besoins des utilisateurs dans ce domaine.Second, it may be that this solution does not really meet the needs of users in this area.

En fait, l'utilisateur habituel vérifie rarement la totalité des sécurités présentes dans un document donné.In fact, the habitual user rarely checks all the security features present in a given document.

Seuls les éléments les plus facilement et les plus directement lisibles font l'objet d'une vérification de sa part.Only the most easily and easily readable elements are checked by him.

Dans le cas d'un billet de banque, par exemple, ce sont généralement le filigrane ou certaines fibres colorées ou particules iridescentes visibles à l'oeil nu.In the case of a banknote, for example, it is usually the watermark or some colored fibers or iridescent particles visible to the naked eye.

En dernier lieu, la présence d'un nombre croissant d'éléments de sécurisation au sein d'une même structure de base peut entraîner des phénomènes de gêne entre éléments de sécurisation possédant des propriétés physiques incompatibles entre elles.Finally, the presence of a growing number of security elements within the same basic structure can lead to interference phenomena between security elements having physical properties that are incompatible with each other.

Ainsi, dans le cas des billets de banque, il est parfois nécessaire d'opacifier la matière fibreuse de manière à augmenter le rendu et le contraste du filigrane.Thus, in the case of banknotes, it is sometimes necessary to opacify the fibrous material so as to increase the rendering and the contrast of the watermark.

Cette opacification peut alors gêner la vision des autres particules ou fibres destinées à l'authentification.This opacification can then hinder the vision of other particles or fibers intended for authentication.

Seules les particules ou fibres situées à la surface du billet seront visibles, les autres étant noyées dans la couche fibreuse opaque.Only the particles or fibers located on the surface of the note will be visible, the others being embedded in the opaque fibrous layer.

Dans le brevet US 5,565,276 , on décrit un papier de sécurité qui peut être formé d'un premier jet de papier et d'un second jet de grammage inférieur à celui du premier et qui contient des planchettes iridescentes comme élément d'authentification. Le but de ce brevet est d'améliorer la visibilité des planchettes.In the patent US5,565,276 there is described a security paper which may be formed of a first paper jet and a second paper of a weight less than that of the first and which contains iridescent boards as an authentication element. The purpose of this patent is to improve the visibility of the boards.

Toutefois il reste nécessaire d'améliorer encore la sécurisation des documents de sécurité et/ou leur résistance mécanique.However, it remains necessary to further improve the security of security documents and / or their mechanical strength.

Un des buts de l'invention est donc de proposer un papier de sécurité permettant d'accroître le niveau de sécurisation desdits documents tout en évitant ces problèmes de l'art antérieur.One of the aims of the invention is therefore to provide a security paper to increase the security level of said documents while avoiding these problems of the prior art.

Parallèlement ou conjointement à ces problèmes liés à l'authentification et à la prévention des contrefaçons de documents de sécurité, il est en effet également essentiel d'assurer une durée de vie suffisante à ces documents de sécurité, soumis à des contraintes diverses au cours de leur utilisation.In parallel or in combination with these problems related to the authentication and prevention of counterfeit security documents, it is indeed also essential to ensure a sufficient lifetime for these security documents, subject to various constraints during their usage.

En particulier, dans le cas d'un billet de banque notamment, il faut tenir compte d'une manipulation fréquente, notamment un pliage et un dépliage répété du billet qui, si aucune adaptation de la structure fibreuse n'a été envisagée à ce niveau, peut entraîner une détérioration rapide, voire une déchirure, dudit billet. Cette dégradation peut entrainer aussi une dégradation des éléments d'authentification desdits documents.In particular, in the case of a banknote in particular, it must be taken into account frequent handling, including folding and repeated unfolding of the note which, if no adaptation of the fibrous structure was considered at this level , can cause a rapid deterioration or tear of said ticket. This degradation can also lead to a degradation of the authentication elements of said documents.

Il peut donc être intéressant d'introduire certains matériaux de renfort au sein de la couche fibreuse.It may therefore be advantageous to introduce certain reinforcing materials into the fibrous layer.

Des problèmes de formation de feuille peuvent toutefois apparaître lors d'un ajout trop important de matériaux de renfort.Sheet forming problems may occur, however, when too much reinforcing material is added.

La Demanderesse a notamment constaté que l'introduction de fibres synthétiques dans une couche fibreuse, dans le but d'accroître sa résistance mécanique, dégrade en fait la qualité et le rendu d'un filigrane formé au sein de cette couche.The Applicant has found in particular that the introduction of synthetic fibers into a fibrous layer, in order to increase its mechanical strength, degrades the quality and the rendering of a watermark formed within this layer.

Un autre but de l'invention est donc de proposer un papier de sécurité permettant de concilier à la fois une sécurisation correcte et fiable desdits documents tout en leur conférant une résistance, mécanique ou chimique, adaptée à son usage habituel.Another object of the invention is therefore to provide a security paper to reconcile both a correct and reliable security of said documents while giving them a resistance, mechanical or chemical, suitable for its usual use.

A ce titre, la Demanderesse a eu l'idée d'utiliser une technique papetière mettant en oeuvre plusieurs jets de matière fibreuse.In this respect, the Applicant has had the idea of using a papermaking technique using several jets of fibrous material.

L'assemblage de deux couches papetières issues de deux jets de formation distincts permet d'obtenir une structure fibreuse à plusieurs couches, chaque couche correspondant à un jet de matière fibreuse, chaque jet ayant une composition de pâte spécifique.The assembly of two paper layers from two separate formation jets makes it possible to obtain a fibrous structure with several layers, each layer corresponding to a jet of fibrous material, each jet having a specific dough composition.

L'avantage de cette technique est qu'elle permet de différencier chaque jet en fonction des propriétés recherchées pour chacune des couches du papier.The advantage of this technique is that it makes it possible to differentiate each jet according to the desired properties for each of the layers of the paper.

En incluant des éléments de sécurité différents sur chacune des faces du papier, on renforce également le niveau de sécurité dudit papier, étant donné la difficulté accrue pour un contrefacteur éventuel à reproduire une telle structure.By including different security elements on each of the faces of the paper, the security level of said paper is also increased, given the increased difficulty for a possible counterfeiter to reproduce such a structure.

Ainsi, pour répondre au problème exposé précédemment au sujet de la présence simultanée au sein de la même couche fibreuse de deux éléments d'authentification ou d'un élément d'authentification et d'un élément de renfort, d'autant s'ils sont sensiblement incompatibles entre eux, il est parfaitement envisageable, à l'aide de cette technique, de séparer ces éléments en les positionnant dans deux couches différentes du papier.Thus, in response to the problem described above concerning the simultaneous presence within the same fibrous layer of two authentication elements or an authentication element and a reinforcing element, especially if they are Since they are substantially incompatible with each other, it is perfectly possible, using this technique, to separate these elements by positioning them in two different layers of the paper.

Ceci implique en fait de prévoir au moins deux jets de matière fibreuse dans lequel le ou les jets comportant l'un desdits éléments ne comporterait pas l'autre desdits éléments et réciproquement.This implies in fact to provide at least two streams of fibrous material in which the jet or jets having one of said elements would not include the other of said elements and vice versa.

Outre le fait de positionner les éléments d'authentification ou de renfort dans des zones séparées du papier, cette structure présente également l'avantage de limiter la consommation desdits éléments.In addition to positioning the authentication or reinforcement elements in separate areas of the paper, this structure also has the advantage of limiting the consumption of said elements.

En effet, en répartissant une quantité donnée d'éléments d'authentification sur une couche externe d'une structure fibreuse à couches multiples, on constate que l'effet visuel produit par ces éléments est renforcé par rapport à celui produit lors d'un ajout des mêmes éléments dans une structure fibreuse de même grammage, mais à couche unique.Indeed, by distributing a given quantity of authentication elements on an outer layer of a multilayered fibrous structure, it is found that the visual effect produced by these elements is reinforced compared to that produced during an addition. the same elements in a fibrous structure of the same weight, but single layer.

Ce renforcement peut s'expliquer par la densité supérieure d'éléments d'authentification accessibles (en particulier visibles) dans la couche externe de la structure multicouche comparativement à celle de la structure à couche unique.This reinforcement can be explained by the higher density of accessible authentication elements (in particular visible) in the outer layer of the multilayer structure compared to that of the single-layer structure.

Ceci entraîne statistiquement une proportion plus importante d'éléments d'authentification affleurant à la surface du papier ou, tout au moins, suffisamment proches de cette surface pour être par exemple visibles.This statistically results in a larger proportion of authentication elements flush with the surface of the paper or at least sufficiently close to this surface to be visible for example.

Il est donc facile d'en déduire que l'obtention d'un même effet visuel nécessitera une quantité moindre d'éléments d'authentification dans le cas de la structure multicouche que dans le cas d'une structure à couche unique.It is therefore easy to deduce that obtaining the same visual effect will require a smaller amount of authentication elements in the case of the multilayer structure than in the case of a single layer structure.

La présente invention consiste donc en un papier de sécurité comportant au moins deux jets fibreux de papier, le premier jet étant un jet externe qui comporte au moins un élément d'authentification et l'autre jet, dit second jet, comprenant :

  • un élément de renfort sensiblement absent du premier jet, ledit élément de renfort étant choisi parmi les matériaux améliorant la résistance mécanique; et/ou
  • un autre élément d'authentification et l'élément d'authentification dudit premier jet étant absent dudit second jet.
The present invention therefore consists of a security paper comprising at least two fibrous jets of paper, the first jet being an external jet which comprises at least one authentication element and the other jet, said second jet, comprising:
  • a reinforcing element substantially absent from the first jet, said reinforcing element being chosen from materials improving the mechanical strength; and or
  • another authentication element and the authentication element of said first jet being absent from said second jet.

Selon un mode préféré de l'invention, ledit élément de renfort est choisi parmi les fibres synthétiques, notamment les fibres de polyester ou de polyamide, les fibres textiles naturelles notamment les fibres d'abaca, de chanvre, de lin, de chinook, et leurs mélanges.According to a preferred embodiment of the invention, said reinforcing element is chosen from synthetic fibers, in particular polyester or polyamide fibers, natural textile fibers, in particular abaca, hemp, flax, chinook fibers, and their mixtures.

Selon un cas particulier de l'invention, lesdites fibres de polyester sont des fibres de polyéthylène téréphtalate (PET), plus particulièrement elles sont présentes en une quantité comprise entre 10 et 20 parts en poids sec pour 100 parts des autres fibres dudit second jet.According to a particular case of the invention, said polyester fibers are polyethylene terephthalate (PET) fibers, more particularly they are present in an amount of between 10 and 20 parts by dry weight per 100 parts of the other fibers of said second jet.

Selon un mode particulier de l'invention, ledit élément d'authentification du premier jet, et le cas échéant celui du second jet, est détectable de manière optique.According to a particular embodiment of the invention, said authentication element of the first jet, and if appropriate that of the second jet, is detectable optically.

Selon un mode particulier de l'invention, au moins un élément d'authentification est choisi parmi les filigranes, les particules iridescentes, les fibres ou particules luminescentes, en particulier fluorescentes ou phosphorescentes, les fibres ou particules colorées ou thermochromes, en particulier lesdites particules sont des planchettes.According to one particular embodiment of the invention, at least one authentication element is chosen from watermarks, iridescent particles, fibers or luminescent particles, in particular fluorescent or phosphorescent particles, colored or thermochromic fibers or particles, in particular said particles. are boards.

Selon un autre mode préféré de l'invention, au moins un élément d'authentification réagit à certaines stimulations en donnant un signal spécifique détectable à l'aide d'un appareil adapté.According to another preferred embodiment of the invention, at least one authentication element reacts to certain stimulations by giving a specific detectable signal using a suitable apparatus.

Selon un mode particulier de l'invention, au moins un élément d'authentification est choisi parmi les substances réagissant à des champs électromagnétiques, en particulier de type micro-onde.According to one particular embodiment of the invention, at least one authentication element is chosen from substances that react with electromagnetic fields, in particular of the microwave type.

Selon un cas particulier de l'invention, l'un des jets a une épaisseur sensiblement supérieure à celle d'un jet ou des autres jets, de préférence d'environ 1,5 à 2 fois supérieure.According to a particular case of the invention, one of the jets has a thickness substantially greater than that of a jet or other jets, preferably about 1.5 to 2 times greater.

Selon un cas particulier de l'invention, le premier jet externe comporte un filigrane comme élément d'authentification et a une épaisseur sensiblement supérieure à celle dudit second jet ou des autres jets de préférence d'environ 1,5 à 2 fois supérieure. En effet, pour avoir un filigrane de bonne qualité, il faut un jet suffisamment épais.According to a particular case of the invention, the first external jet comprises a watermark as an authentication element and has a thickness substantially greater than that of said second jet or other jets preferably about 1.5 to 2 times greater. Indeed, to have a good quality watermark, you need a sufficiently thick stream.

Selon un cas préféré de l'invention, le premier jet comporte un filigrane comme élément d'authentification et le second jet comporte ledit élément de renfort.According to a preferred case of the invention, the first jet comprises a watermark as an authentication element and the second jet comprises said reinforcing element.

Selon un cas particulier de l'invention, ledit élément de renfort a aussi une fonction d'authentification. Plus particulièrement, ledit élément de renfort constitue l'élément d'authentification dudit second jet.According to a particular case of the invention, said reinforcing element also has an authentication function. More particularly, said reinforcing element constitutes the authentication element of said second jet.

En effet, ledit élément de renfort peut être par exemple une des fibres de renfort citées précédemment et qui de plus aurait été traitée pour avoir des propriétés électromagnétiques en général et en particulier luminescentes, par exemple magnétique ou fluorescente. Il peut s'agir par exemple d'une fibre de polyester, en particulier de polyéthylène téréphtalate (PET) qui possède un composé réactif (fluorescent par exemple) par greffage ou par ajout lors de l'extrusion de la fibre. Il peut s'agir aussi de fibres métalliques spécifiques ayant une fonction de renfort et d'authentification.Indeed, said reinforcing element may be for example one of the reinforcing fibers mentioned above and which moreover would have been treated to have electromagnetic properties in general and in particular luminescent, for example magnetic or fluorescent. It may be for example a polyester fiber, in particular polyethylene terephthalate (PET) which has a reactive compound (fluorescent for example) by grafting or by addition during the extrusion of the fiber. It may also be specific metal fibers having a reinforcement and authentication function.

De préférence, le papier selon l'invention comporte un second jet contenant ledit élément de renfort et ledit papier a un indice de déchirure supérieur ou égal à 10 mN*m2/g.Preferably the paper according to the invention includes a second ply containing said reinforcing member and said paper has a tear index greater than or equal to 10 mN * m 2 / g.

Selon un cas particulier de l'invention, les jets sont à base (majoritairement) de fibres de coton.According to a particular case of the invention, the jets are based (mainly) on cotton fibers.

Selon un cas particulier de l'invention, le papier de sécurité est un papier billet de banque.According to a particular case of the invention, the security paper is a banknote paper.

Selon un cas particulier de l'invention, le papier de sécurité comporte trois jets fibreux, ledit premier jet externe comportant un élément d'authentification, ledit second jet étant central et comportant ledit élément de renfort, et le troisième jet étant un autre jet externe comportant un élément d'authentification pouvant être différent de celui dudit premier jet.According to a particular case of the invention, the security paper comprises three fibrous jets, said first external jet having an authentication element, said second jet being central and comprising said reinforcing element, and the third jet being another external jet having an authentication element that may be different from that of said first jet.

L'invention vise également à protéger le procédé d'obtention dudit papier de sécurité, lesdits jets étant assemblés en phase humide.The invention also aims at protecting the process for obtaining said security paper, said jets being assembled in the wet phase.

Le papier peut par exemple être fabriqué selon le procédé de fabrication comprenant les étapes suivantes :

  • on forme au moins un premier jet de papier sur une première partie humide d'une machine à papier, ledit premier jet de papier étant formé à partir d'une première composition de pâte comportant un élément d'authentification, en particulier un filigrane,
  • on forme au moins un second jet de papier sur une seconde partie humide d'une machine à papier, ledit second jet de papier étant formé à partir d'une seconde composition de pâte et comportant au moins un élément de renfort et/ou d'authentification tel que décrit ci-dessus, ledit élément étant absent de ladite première composition de pâte et/ou dudit premier jet,
  • on assemble les deux jets de papier de manière à former une structure multijet unitaire,
  • on presse et on sèche la structure multijet ainsi obtenue.
The paper may for example be manufactured according to the manufacturing method comprising the following steps:
  • at least one first jet of paper is formed on a first wet part of a paper machine, said first paper jet being formed from a first dough composition comprising an authentication element, in particular a watermark,
  • forming at least a second paper jet on a second wet portion of a paper machine, said second paper jet being formed from a second dough composition and having at least one reinforcing member and / or authentication as described above, said element being absent from said first dough composition and / or said first jet,
  • the two jets of paper are assembled so as to form a unitary multijet structure,
  • the multijet structure thus obtained is pressed and dried.

Le papier peut être notamment formé sur une machine à papier à forme ronde comportant deux ou plusieurs unités de formation de feuille, ou on peut former un jet sur forme ronde et un autre jet (ou plusieurs autres jets) sur un former, ou encore le papier peut être formé sur une machine à papier multijet à table plate.
De préférence quand le papier comporte un filigrane, on forme le jet avec le filigrane sur une forme ronde avec toile filigraneuse et l'autre jet (ou les autres jets le cas échéant) sur un former.
L'invention sera mieux comprise à l'aide des exemples qui suivent.The paper may in particular be formed on a round-shaped paper machine having two or more sheet-forming units, or a round-shaped jet and another jet (or several other jets) may be formed on a former, or the Paper can be formed on a multi-table flatbed machine.
Preferably when the paper has a watermark, the jet is formed with the watermark on a round shape with filigranous fabric and the other jet (or the other jets if necessary) on a former.
The invention will be better understood with the aid of the following examples.

Exemple 1 comparatif :Comparative Example 1:

On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de coton et 0,5 part de planchettes fluorescentes rouges, et à l'aide d'un appareil à formette de laboratoire adapté pour appliquer un motif filigrane dans la masse du papier obtenu, une série de feuilles de papier filigrané de format carré et ayant une surface de 310 cm2.It is made from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 parts of red fluorescent boards, and with the aid of a laboratory-form apparatus adapted to apply a watermark pattern to the mass of the resulting paper, a series of square-format watermark paper sheets having an area of 310 cm 2 .

Le grammage du papier obtenu est de 85 g/m2.The basis weight of the paper obtained is 85 g / m 2 .

Les planchettes fluorescentes s'observent qu'en partie, certaines étant trop enfouies dans la masse du papier.The fluorescent boards are observed in part, some being too buried in the mass of the paper.

Exemple 2 :Example 2

On réalise à partir d'une composition fibreuse contenant comme fibres uniquement de des fibres de coton, et à l'aide d'un appareil à formette de laboratoire adapté pour appliquer un motif filigrane dans la masse du papier obtenu, une première série de feuilles de papier filigrané de format carré et ayant une surface de 310 cm2.From a fibrous composition containing as fibers only cotton fibers, and using a laboratory form apparatus suitable for applying a watermark pattern in the mass of the paper obtained, a first series of sheets is produced. Filigree paper of square format and having a surface of 310 cm 2 .

Le grammage du papier de cette première série est de 55 g/m2.The paper weight of this first series is 55 g / m 2 .

On réalise ensuite à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de coton et 0,5 part de planchettes fluorescentes rouges, et à l'aide d'un appareil à formette de laboratoire une seconde série de feuilles de format carré et ayant une surface de 310 cm2 It is then made from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 parts of red fluorescent boards, and using a laboratory form apparatus a second series of sheets of square format and having a surface of 310 cm 2

Le grammage du papier de cette seconde série est de 30 g/m2.The paper weight of this second series is 30 g / m 2 .

On assemble ensuite, à l'état humide, une feuille de la première série avec une feuille de la seconde série.Then, in the wet state, a sheet of the first series is assembled with a sheet of the second series.

On sèche le complexe obtenu.The resulting complex is dried.

Exemple 3 :Example 3

On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de coton et 0,5 parts de fibres fluorescentes vertes à l'aide d'un appareil à formette de laboratoire, une première série de feuilles de papier de format carré et ayant une surface de 310 cm2 It is made from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 parts of green fluorescent fibers using a laboratory form apparatus, a first series of sheets of paper of square format and having a surface of 310 cm 2

Le grammage du papier de cette première série est de 30 g/m2.The paper weight of this first series is 30 g / m 2 .

On réalise par ailleurs, à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de coton et 0,5 part de planchettes fluorescentes rouges, et à l'aide d'un appareil à formette de laboratoire une seconde série de feuilles de format carré et ayant une surface de 310 cm2.In addition, from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 parts of red fluorescent boards, and using of a laboratory-form apparatus a second series of sheets of square format and having an area of 310 cm 2 .

Le grammage du papier de cette seconde série est de 55 g/m2.The paper weight of this second series is 55 g / m 2 .

On assemble ensuite, à l'état humide, une feuille de la première série avec une feuille de la seconde série.Then, in the wet state, a sheet of the first series is assembled with a sheet of the second series.

On sèche le complexe obtenu.The resulting complex is dried.

Tests effectués dans les exemples 1 à 3 :Tests carried out in Examples 1 to 3:

En éclairant aux rayons ultraviolets les papiers obtenus dans les exemples 1 à 3, on a compté le nombre des planchettes fluorescentes les plus clairement visibles à l'oeil nu.By illuminating the papers obtained in Examples 1 to 3 with ultraviolet rays, the number of fluorescent boards most clearly visible to the naked eye was counted.

Résultats des tests :Test results:

On dénombre respectivement 92 planchettes fluorescentes dans l'exemple 1, 120 planchettes fluorescentes dans l'exemple 2 et 268 planchettes fluorescentes dans l'exemple 3.There are respectively 92 fluorescent boards in Example 1, 120 fluorescent boards in Example 2 and 268 fluorescent boards in Example 3.

De même dans l'exemple 3, les planchettes et les fibres fluorescentes s'observent bien.Similarly in Example 3, the boards and the fluorescent fibers are observed well.

Il est de ce fait particulièrement avantageux de privilégier, à grammage constant, la solution d'un complexe papier comportant au moins deux jets différenciés, chacun comportant les éléments de sécurité.It is therefore particularly advantageous to give priority, at constant weight, to the solution of a paper complex comprising at least two differentiated jets, each comprising the security elements.

Exemple 4 comparatif:Comparative Example 4:

On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de coton et à l'aide d'un appareil à formette de laboratoire adapté pour appliquer un motif filigrane dans la masse du papier obtenu, une série de feuilles de papier filigrané de format carré et ayant une surface de 310 cm2.It is made from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and with the aid of a laboratory form apparatus adapted to apply a watermark pattern in the mass of the paper obtained, a series of sheets of watermark paper of square format and having a surface area of 310 cm 2 .

Le grammage du papier obtenu est de 85 g/m2.The basis weight of the paper obtained is 85 g / m 2 .

Exemple 5 comparatif :Comparative Example 5:

On réalise à partir d'une composition fibreuse contenant comme fibres uniquement desfibres de coton et 12 parts de fibres synthétiques de polyéthylène téréphtalate (PET) comme fibres de renfort, et à l'aide d'un appareil à formette de laboratoire adapté pour appliquer un motif filigrane dans la masse du papier obtenu, une série de feuilles de papier filigrané de format carré et ayant une surface de 310 cm2. Les fibres de PET ont une longueur de 6 mm, un diamètre de 12 µm et une ténacité de 1,4 dtex.It is made from a fibrous composition containing as fibers only cotton fibers and 12 parts of synthetic fibers of polyethylene terephthalate (PET) as reinforcing fibers, and using a laboratory form apparatus adapted to apply a watermark pattern in the mass of paper obtained, a series of sheets of square-shaped watermark paper having a surface area of 310 cm 2 . The PET fibers have a length of 6 mm, a diameter of 12 μm and a tenacity of 1.4 dtex.

Le grammage du papier obtenu est de 85 g/m2.The basis weight of the paper obtained is 85 g / m 2 .

Exemple 6 :Example 6

On réalise à partir d'une composition fibreuse contenant comme fibres uniquement des fibres de coton, et à l'aide d'un appareil à formette de laboratoire adapté pour appliquer un motif filigrane dans la masse du papier, une première série de feuilles de papier filigrané de format carré et ayant une surface de 310 cm2.From a fibrous composition containing as fibers only cotton fibers, and using a laboratory form apparatus suitable for applying a watermark pattern to the mass of the paper, a first series of sheets of paper is made. Filigree format square and having a surface of 310 cm 2 .

Le grammage du papier de cette première série est de 55 g/m2.The paper weight of this first series is 55 g / m 2 .

On réalise par ailleurs à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de coton et 12 parts de fibres synthétiques de polyéthylène téréphtalate utilisées à l'exemple 5, et à l'aide d'un appareil à formette de laboratoire, une seconde série de feuilles de format carré et ayant une surface de 310 cm2.It is also produced from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 12 parts of synthetic polyethylene terephthalate fibers used in Example 5, and using a form apparatus laboratory, a second series of sheets of square format and having an area of 310 cm 2 .

Le grammage du papier de cette seconde série est de 30 g/m2.The paper weight of this second series is 30 g / m 2 .

On assemble ensuite, à l'état humide, une feuille de la première série avec une feuille de la seconde série.Then, in the wet state, a sheet of the first series is assembled with a sheet of the second series.

On sèche le complexe obtenu.The resulting complex is dried.

Exemple 7 :Example 7

On réalise à partir d'une composition fibreuse contenant comme fibres uniquement des fibres de coton et à l'aide d'un appareil à formette de laboratoire adapté pour appliquer un motif filigrane dans la masse du papier, une première série de feuilles de papier filigrané de format carré et ayant une surface de 310 cm2.From a fibrous composition containing as fibers only cotton fibers and using a laboratory form apparatus suitable for applying a watermark pattern to the mass of the paper, a first series of watermarked paper sheets is produced. of square format and having an area of 310 cm 2 .

Le grammage du papier de cette première série est de 55 g/m2.The paper weight of this first series is 55 g / m 2 .

On réalise par ailleurs, à l'aide d'un appareil à formette de laboratoire, une seconde série de feuilles de format carré et ayant une surface de 310 cm2. à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de coton et 12 parts de fibres de polyester fluorescentes (fibres PET de mêmes caractéristiques que celles utilisées à l'exemple 5) comme fibres de renfort et jouant aussi le rôle de second élément d'authentification.In addition, a second series of sheets of square format having a surface area of 310 cm 2 is produced using a laboratory form apparatus from a fibrous composition containing, in dry weight, 100 parts. of cotton fibers and 12 parts fluorescent polyester fibers (PET fibers of the same characteristics as those used in Example 5) as reinforcing fibers and also acting as a second element of authentication.

Le grammage du papier de cette seconde série est de 30 g/m2.The paper weight of this second series is 30 g / m 2 .

On assemble ensuite, à l'état humide, une feuille de la première série avec une feuille de la seconde série.Then, in the wet state, a sheet of the first series is assembled with a sheet of the second series.

On sèche le complexe obtenu.The resulting complex is dried.

Tests effectués dans les exemples 4 à 6 :Tests carried out in Examples 4 to 6:

On a d'abord évalué à l'aide de tests normalisés la résistance mécanique du papier dans chacun des exemples 4 à 6.The mechanical strength of the paper in each of Examples 4 to 6 was first evaluated using standard tests.

En appliquant la norme NF EN 21974, on a ainsi évalué l'indice de déchirure des papiers obtenus.By applying the NF EN 21974 standard, the tear index of the papers obtained was thus evaluated.

En appliquant la norme NF ISO 5626, on a également évalué la résistance au double pli.By applying the NF ISO 5626 standard, the double-fold resistance was also evaluated.

On a ensuite évalué visuellement le rendu du filigrane dans chacun des exemples 4 à 6.The watermark rendering was then visually assessed in each of Examples 4 to 6.

Résultats des tests :Test results:

Le tableau 1 ci-dessous donne les résultats des tests effectués pour les exemples 4 à 6.Table 1 below gives the results of the tests carried out for Examples 4 to 6.

On constate que la résistance mécanique du papier augmente lorsque l'on introduit des fibres synthétiques dans la composition fibreuse, les meilleurs résultats étant obtenus dans l'exemple 6 correspondant au papier bijet.It is found that the mechanical strength of the paper increases when synthetic fibers are introduced into the fibrous composition, the best results being obtained in Example 6 corresponding to the bijet paper.

On constate également que le rendu du filigrane augmente lorsque l'on sépare le papier en deux jets, l'un contenant les fibres synthétiques de renfort et l'autre le motif filigrane, comme dans l'exemple 6. TABLEAU 1 : EXEMPLE 4
comparatif EXEMPLE 5
comparatif EXEMPLE 6 Indice de déchirure
( en mN•m2/g) 6,9 9,7 10,2 Double-plis 2769 6722 7013 Rendu du filigrane Bon Médiocre Bon It is also noted that the rendering of the watermark increases when the paper is separated into two streams, one containing the synthetic reinforcing fibers and the other the watermark pattern, as in Example 6. <u> TABLE 1: </ u> EXAMPLE 4
comparative EXAMPLE 5
comparative EXAMPLE 6 Tear index
(in mN • m 2 / g) 6.9 9.7 10.2 Double folds 2769 6722 7013 Rendered watermark Well Poor Well

Claims (16)

  1. Security paper comprising at least two fibrous paper plies, the first ply being an external ply comprising at least one authentication element and the other ply, referred to as the second ply, including:
    - a reinforcing element substantially absent from the first ply, the said reinforcing element being selected from materials that improve the mechanical strength, and/or
    - another authentication element, the authentication element of the said first ply being absent from the second ply.
  2. Security paper according to the preceding claim, characterised in that the said reinforcing element is selected from synthetic fibres, in particular polyester or polyamide fibres, natural textile fibres, in particular abaca, hemp, flax or Chinook fibres, and mixtures thereof.
  3. Security paper according to preceding claim 2, characterised in that the said polyester fibres are polyethylene terephthalate fibres, in particular present in a quantity of between 10 and 20 parts by dry weight per 100 parts of the other fibres of the said second ply.
  4. Security paper according to one of the preceding claims, characterised in that the said authentication element of the said first ply, and, where applicable, that of the said second ply, can be detected optically.
  5. Security paper according to preceding claim 4, characterised in that the said authentication element is selected from watermarks, iridescent particles, luminescent, in particular fluorescent or phosphorescent fibres or particles, or coloured or thermochromic fibres or particles, the said particles being, in particular, flakes.
  6. Security paper according to one of the preceding claims, characterised in that the said authentication element of one of the plies reacts to certain stimuli, giving a specific signal that can be detected using a suitable apparatus.
  7. Security paper according to preceding claim 6, characterised in that the said element is selected from substances that react to electromagnetic fields, in particular of the microwave type.
  8. Security paper according to one of the preceding claims, characterised in that the said first external ply comprises a watermark as an authentication element and has a thickness substantially greater than that of the said second ply or of the other plies, preferably approximately 1.5 to 2 times greater.
  9. Security paper according to one of the preceding claims, characterised in that the said reinforcing element also has an authentication function.
  10. Security paper according to preceding claim 9, characterised in that the said reinforcing element forms the authentication element of the said second ply.
  11. Security paper according to one of the preceding claims, characterised in that the said second ply comprises the said reinforcing element and that the said paper has a tear index greater than or equal to 10 mN*m2/g.
  12. Security paper according to one of the preceding claims, characterised in that the plies are based on cotton fibres.
  13. Security paper according to one of the preceding claims, characterised in that it comprises three fibrous plies, the said first external ply comprising an authentication element, the said second ply being central and comprising the said reinforcing element, and the third ply being another external ply comprising an authentication element that may be different from that of the said first ply.
  14. Security paper according to one of the preceding claims, characterised in that it is a banknote paper.
  15. Process for the manufacture of a security paper according to one of the preceding claims, characterised in that the said plies are assembled wet.
  16. Process for the manufacture of a security paper according to the preceding claim, characterised in that the said first external ply comprises a watermark and is formed on a cylinder machine comprising a watermark wire.
EP04791542.6A 2003-10-15 2004-10-15 Multi-layer security paper Not-in-force EP1687484B2 (en)

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FR0312020A FR2861101B1 (en) 2003-10-15 2003-10-15 MULTIJET SAFETY PAPER
PCT/FR2004/002631 WO2005038135A1 (en) 2003-10-15 2004-10-15 Multi-layer security paper

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EP1687484B1 true EP1687484B1 (en) 2010-12-29
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AT (1) ATE493546T1 (en)
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CA (1) CA2542196C (en)
DE (1) DE602004030822D1 (en)
ES (1) ES2358596T5 (en)
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WO2005038135A1 (en) 2005-04-28
EP1687484A1 (en) 2006-08-09
US20070128418A1 (en) 2007-06-07
CA2542196C (en) 2012-02-21
ES2358596T5 (en) 2014-10-28
BRPI0415493A (en) 2006-12-26
BRPI0415493B1 (en) 2015-12-22
CA2542196A1 (en) 2005-04-28
ES2358596T3 (en) 2011-05-12
FR2861101A1 (en) 2005-04-22
EP1687484B2 (en) 2014-08-06
US9464385B2 (en) 2016-10-11
DE602004030822D1 (en) 2011-02-10
FR2861101B1 (en) 2007-06-15
ATE493546T1 (en) 2011-01-15

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