EP1687484A1 - Multi-layer security paper - Google Patents

Multi-layer security paper

Info

Publication number
EP1687484A1
EP1687484A1 EP04791542A EP04791542A EP1687484A1 EP 1687484 A1 EP1687484 A1 EP 1687484A1 EP 04791542 A EP04791542 A EP 04791542A EP 04791542 A EP04791542 A EP 04791542A EP 1687484 A1 EP1687484 A1 EP 1687484A1
Authority
EP
European Patent Office
Prior art keywords
jet
security paper
fibers
paper according
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
EP04791542A
Other languages
German (de)
French (fr)
Other versions
EP1687484B2 (en
EP1687484B1 (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 SAS
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34385169&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1687484(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ArjoWiggins SAS filed Critical ArjoWiggins SAS
Publication of EP1687484A1 publication Critical patent/EP1687484A1/en
Application granted granted Critical
Publication of EP1687484B1 publication Critical patent/EP1687484B1/en
Publication of EP1687484B2 publication Critical patent/EP1687484B2/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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 production of banknotes, passports, certificates of authenticity, checks.
  • the invention also relates to the method of manufacturing said security paper.
  • a large number of printed documents require increasing resources to ensure their authentication and security. These documents range from banknotes to transport tickets and also include scratch-off game tickets, playing cards, checks, identity cards or passports.
  • the Applicant has noted in particular that the introduction of synthetic fibers into a fibrous layer, in order to increase its mechanical strength, in fact degrades the quality and rendering of a watermark formed within this layer.
  • Another object of the invention is therefore to propose a security paper making it possible to reconcile both correct and reliable securing of said documents while giving them resistance, mechanical or chemical, suitable for its usual use.
  • the Applicant had the idea of using a papermaking technique using several jets of fibrous material.
  • 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 pulp composition.
  • the advantage of this technique is that it makes it possible to differentiate each jet according to the properties sought for each of the layers of the paper.
  • the security level of said paper is also reinforced, given the increased difficulty for a possible counterfeiter to reproduce such a structure.
  • this technique in order to respond to the problem explained above concerning the simultaneous presence within the same fibrous layer of two authentication elements or of an authentication element and of a reinforcement element, all the more if 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 paper. This in fact involves providing at least two jets of fibrous material in which the jets comprising one of said elements would not include the other of said elements and vice versa.
  • 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. Indeed, by distributing a given quantity of authentication elements on an external layer of a fibrous structure with multiple layers, it can be seen that the visual effect produced by these elements is reinforced compared to that produced during an addition. of the same elements in a fibrous structure of the same grammage, but with a single layer. 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. This statistically results in a higher proportion of authentication elements flush with the surface of the paper or, at least, close enough to this surface to be visible, for example.
  • 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, known as the second jet, comprising: - an element reinforcement substantially absent from the first jet, said reinforcement element being chosen from materials improving mechanical resistance; and / or - another authentication element and the authentication element of said first jet being absent from said second jet.
  • 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 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 where appropriate that of the second jet is detectable optically.
  • At least one authentication element is chosen from watermarks, iridescent particles, luminescent fibers or particles, in particular fluorescent or phosphorescent, 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 signal detectable with the aid of a suitable device.
  • at least one authentication element is chosen from substances reacting to electromagnetic fields, in particular of the microwave type.
  • one of the jets has a thickness substantially greater than that of a jet or of the other jets, preferably approximately 1.5 to 2 times greater.
  • the first external jet has a watermark as an authentication element and has a thickness substantially greater than that of said second jet or of the other jets, preferably about 1.5 to 2 times greater. Indeed, to have a good quality watermark, you need a sufficiently thick spray.
  • 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 for example be 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 for example be 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 can also be specific metal fibers having a reinforcement and authentication function.
  • the paper according to the invention comprises a second jet containing said reinforcing element and said paper has a tear index greater than or equal to 10 mN * m / g.
  • the jets are (mainly) based on cotton fibers.
  • the security paper is a banknote paper.
  • the security paper comprises three fibrous jets, said first external jet comprising an authentication element, said second jet being central and comprising said reinforcing element, and the third jet being another external jet comprising an authentication element which may be different from that of said first jet.
  • the invention also aims to protect the process for obtaining said security paper, said jets being assembled in the wet phase.
  • the paper can for example be manufactured according to the manufacturing method comprising the following steps: at least a first jet of paper is formed on a first wet part of a paper machine, said first jet of paper being formed from a first pulp composition comprising an authentication element, in particular a watermark, at least one second jet of paper is formed on a second wet part of a paper machine, said second jet of paper being formed from a second paste composition and comprising at least one reinforcement and / or authentication element as described above, said element being absent from said first paste composition and / or from said first jet, the two paper jets are assembled so to form a unitary multijet structure, the multijet structure thus obtained is pressed and dried.
  • the paper can in particular be formed on a round-shaped paper machine comprising two or more sheet forming units, or a jet can be formed on a round form and another jet (or several other jets) on a former, or else the paper can be formed on a flat table multijet paper machine.
  • the jet is formed with the watermark on a round shape with watermarked fabric and the other jet (or the other jets if necessary) on a former.
  • Comparative Example 1 A fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 part of red fluorescent boards is produced, and using a laboratory form apparatus suitable for applying a watermark motif in the mass of the paper obtained, a series of sheets of watermark paper of square format and having a surface of 310 cm. The grammage of the paper obtained is 85 g / m. The fluorescent boards are only partially observed, some being too buried in the bulk of the paper.
  • a first series of sheets is produced from a fibrous composition containing as fibers only cotton fibers, and using a laboratory form device suitable for applying a filigree pattern in the mass of the paper obtained.
  • square format watermark paper with a surface area of 310 cm 2 .
  • the grammage of the paper in this first series is 55 g / m 2 .
  • a second series of sheets is then produced from a fibrous composition containing, on a dry weight basis, 100 parts of cotton fibers and 0.5 part of red fluorescent boards. square format and having a surface of 310 cm.
  • the grammage of the paper in this second series is 30 g / m.
  • the complex obtained is dried.
  • a first series of sheets of paper is produced from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 parts of green fluorescent fibers using a laboratory formwork apparatus. square format and having a surface of 310 cm.
  • the grammage of the paper in this first series is 30 g / m.
  • the grammage of the paper in this second series is 55 g / m 2 .
  • the complex obtained 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 well observed.
  • a series of fibers is produced from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and using a laboratory form device suitable for applying a filigree pattern to the mass of the paper obtained.
  • sheets of watermark paper in square format with an area of 310 cm 2 .
  • the grammage of the paper obtained is 85 g / m 2 .
  • Comparative Example 5 A fiber composition containing as fibers only cotton fibers and 12 parts of synthetic fibers of polyethylene terephthalate is produced. (PET) as reinforcing fibers, and using a laboratory formatter suitable for applying a filigree pattern in the mass of the paper obtained, a series of filigree sheets of square format paper having an area of 310 cm 2 .
  • the PET fibers have a length of 6 mm, a diameter of 12 ⁇ m and a tenacity of 1.4 dtex.
  • the grammage of the paper obtained is 85 g / m.
  • a first series of sheets of paper is produced from a fibrous composition containing as fibers only cotton fibers, and using a laboratory form device suitable for applying a filigree pattern in the mass of the paper. watermark in square format and having a surface of 310 cm.
  • the grammage of the paper in this first series is 55 g / m.
  • the grammage of the paper in this second series is 30 g / m.
  • the complex obtained is dried.
  • a first series of watermarked sheets of paper is produced from a fibrous composition containing only cotton fibers as fibers and using a laboratory form device suitable for applying a filigree pattern in the mass of the paper. square format and having a surface of 310 cm. The grammage of the paper in this first series is 55 g / m.
  • a second form of square format sheets having a surface area of 310 cm 2 is also produced, using a laboratory formatter, from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 12 parts fluorescent polyester fibers (PET fibers with the same characteristics as those used in Example 5) as reinforcing fibers and also playing the role of second authentication element.
  • the grammage of the paper in this second series is 30 g / m 2 . Then, in the wet state, a sheet of the first series is assembled with a sheet of the second series. The complex obtained 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 bijet paper.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Credit Cards Or The Like (AREA)
  • Materials For Medical Uses (AREA)

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

PAPIER DE SECURITE MULTIJET MULTIJET SECURITY PAPER
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. L'invention se rapporte également au procédé de fabrication dudit papier de sécurité. Un grand nombre de documents imprimés nécessitent des moyens croissants pour assurer leur authentification et leur sécurisation. 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. 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. Ces éléments émettent, dans certaines conditions spécifiques, des signaux détectables, généralement à l'œil, l'observation desdits signaux révélant la présence desdits éléments au sein du document et, par là-même, garantissant son authenticité. 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. 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. Les solutions envisagées à ce niveau présentent toutefois certains problèmes. 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. 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. 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. En second lieu, il peut s'avérer que cette solution ne réponde pas réellement aux besoins des utilisateurs dans ce domaine. En fait, l'utilisateur habituel vérifie rarement la totalité des sécurités présentes dans un document donné. Seuls les éléments les plus facilement et les plus directement lisibles font l'objet d'une vérification de sa part. 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'œil nu. 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. 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. Cette opacification peut alors gêner la vision des autres particules ou fibres destinées à l' authentification. Seules les particules ou fibres situées à la surface du billet seront visibles, les autres étant noyées dans la couche fibreuse opaque. 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. Toutefois il reste nécessaire d'améliorer encore la sécurisation des documents de sécurité et/ou leur résistance mécanique. 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. 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. 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. Il peut donc être intéressant d'introduire certains matériaux de renfort au sein de la couche fibreuse. Des problèmes de formation de feuille peuvent toutefois apparaître lors d'un ajout trop important de matériaux de renfort. 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. 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. A ce titre, la Demanderesse a eu l'idée d'utiliser une technique papetière mettant en œuvre plusieurs jets de matière fibreuse. 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. L'avantage de cette technique est qu'elle permet de différencier chaque jet en fonction des propriétés recherchées pour chacune des couches du papier. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. II peut s'agir aussi de fibres métalliques spécifiques ayant une fonction de renfort et d'authentification. 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*m /g. Selon un cas particulier de l'invention, les jets sont à base (majoritairement) de fibres de coton. Selon un cas particulier de l'invention, le papier de sécurité est un papier billet de banque. 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. L'invention vise également à protéger le procédé d'obtention dudit papier de sécurité, lesdits jets étant assemblés en phase humide. 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 present invention relates to a security paper and, more particularly to a security paper used in particular for the production of banknotes, passports, certificates of authenticity, checks. The invention also relates to the method of manufacturing said security paper. A large number of printed documents require increasing resources to ensure their authentication and security. These documents range from banknotes to transport tickets and also include scratch-off game tickets, playing cards, checks, identity cards or passports. To allow the user or the holder of the security document a simple and reliable verification of the authenticity thereof, it is common to include in the mass of the material of the document authentication elements. These elements emit, under certain specific conditions, detectable signals, generally by eye, the observation of said signals revealing the presence of said elements within the document and, thereby, guaranteeing its authenticity. The inclusion of such elements is also intended to prevent malicious people from forging said document, by reproducing the identical or almost identical characteristics of the said document. Security document providers, noting an increase in the level of expertise and organization of potential counterfeiters in this area, have in recent years considered increasing the number and variety of authentication elements present within a same security document. However, the solutions considered at this level present certain problems. First, the possibility of reproducing, identically or almost identically, the security document is not fundamentally reduced by these additional additions of security elements. A counterfeiter who is patient enough and properly equipped is likely to discover the exact nature and quantity of the elements constituting the document to be forged. By reproducing the steps for obtaining the document, which have not been modified, it is not impossible to achieve an almost perfect reproduction of the document in question. Second, it may turn out that this solution does not really meet the needs of users in this area. In fact, the usual user rarely checks all of the security features in a given document. Only the elements that are most easily and directly readable are subject to verification by him. In the case of a bank note, for example, it is usually the watermark or certain colored fibers or iridescent particles visible to the naked eye. Finally, the presence of an increasing number of security elements within the same basic structure can lead to discomfort phenomena between security elements having incompatible physical properties. 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. This clouding can then hinder the vision of the other particles or fibers intended for authentication. Only the particles or fibers located on the surface of the banknote will be visible, the others being embedded in the opaque fibrous layer. In US Pat. No. 5,565,276, a security paper is described which can be formed from a first ply of paper and from a second ply of grammage 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. However, it remains necessary to further improve the security of security documents and / or their mechanical strength. One of the aims of the invention is therefore to propose a security paper making it possible to increase the level of security of said documents while avoiding these problems of the prior art. In parallel or jointly with these problems linked to the authentication and prevention of counterfeit security documents, it is also essential to ensure a sufficient lifetime for these security documents, which are subject to various constraints during their usage. In particular, in the case of a bank note in particular, account must be taken of frequent handling, in particular folding and unfolding of the note repeatedly which, if no adaptation of the fibrous structure has been envisaged at this level , may result in rapid deterioration or even tearing of the said ticket. This degradation can also lead to a degradation of the authentication elements of said documents. It may therefore be advantageous to introduce certain reinforcing materials within the fibrous layer. Sheet formation problems may, however, arise when adding too much reinforcing material. The Applicant has noted in particular that the introduction of synthetic fibers into a fibrous layer, in order to increase its mechanical strength, in fact degrades the quality and rendering of a watermark formed within this layer. Another object of the invention is therefore to propose a security paper making it possible to reconcile both correct and reliable securing of said documents while giving them resistance, mechanical or chemical, suitable for its usual use. As such, the Applicant had the idea of using a papermaking technique using several jets of fibrous material. 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 pulp composition. The advantage of this technique is that it makes it possible to differentiate each jet according to the properties sought for each of the layers of the paper. By including different security elements on each of the faces of the paper, the security level of said paper is also reinforced, given the increased difficulty for a possible counterfeiter to reproduce such a structure. Thus, in order to respond to the problem explained above concerning the simultaneous presence within the same fibrous layer of two authentication elements or of an authentication element and of a reinforcement element, all the more if 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 paper. This in fact involves providing at least two jets of fibrous material in which the jets comprising one of said elements would not include the other of said elements and vice versa. 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. Indeed, by distributing a given quantity of authentication elements on an external layer of a fibrous structure with multiple layers, it can be seen that the visual effect produced by these elements is reinforced compared to that produced during an addition. of the same elements in a fibrous structure of the same grammage, but with a single layer. 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. This statistically results in a higher proportion of authentication elements flush with the surface of the paper or, at least, close enough to this surface to be visible, for example. It is therefore easy to deduce that obtaining the same visual effect will require a lesser amount of authentication elements in the case of the multilayer structure than in the case of a single-layer structure. 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, known as the second jet, comprising: - an element reinforcement substantially absent from the first jet, said reinforcement element being chosen from materials improving mechanical resistance; and / or - another authentication element and the authentication element of said first jet being absent from said second jet. 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. According to a particular case of the invention, said polyester fibers are polyethylene terephthalate (PET) fibers, more particularly they are present in an amount between 10 and 20 parts by dry weight per 100 parts of the other fibers of said second jet. According to a particular embodiment of the invention, said authentication element of the first jet, and where appropriate that of the second jet, is detectable optically. According to a particular embodiment of the invention, at least one authentication element is chosen from watermarks, iridescent particles, luminescent fibers or particles, in particular fluorescent or phosphorescent, colored or thermochromic fibers or particles, in particular said particles are boards. According to another preferred embodiment of the invention, at least one authentication element reacts to certain stimulations by giving a specific signal detectable with the aid of a suitable device. According to a particular embodiment of the invention, at least one authentication element is chosen from substances reacting to electromagnetic fields, in particular of the microwave type. According to a particular case of the invention, one of the jets has a thickness substantially greater than that of a jet or of the other jets, preferably approximately 1.5 to 2 times greater. According to a particular case of the invention, the first external jet has a watermark as an authentication element and has a thickness substantially greater than that of said second jet or of the other jets, preferably about 1.5 to 2 times greater. Indeed, to have a good quality watermark, you need a sufficiently thick spray. 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. 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. In fact, said reinforcing element may for example be 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 for example be 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 can also be specific metal fibers having a reinforcement and authentication function. Preferably, the paper according to the invention comprises a second jet containing said reinforcing element and said paper has a tear index greater than or equal to 10 mN * m / g. According to a particular case of the invention, the jets are (mainly) based on cotton fibers. According to a particular case of the invention, the security paper is a banknote paper. According to a particular case of the invention, the security paper comprises three fibrous jets, said first external jet comprising an authentication element, said second jet being central and comprising said reinforcing element, and the third jet being another external jet comprising an authentication element which may be different from that of said first jet. The invention also aims to protect the process for obtaining said security paper, said jets being assembled in the wet phase. The paper can for example be manufactured according to the manufacturing method comprising the following steps: at least a first jet of paper is formed on a first wet part of a paper machine, said first jet of paper being formed from a first pulp composition comprising an authentication element, in particular a watermark, at least one second jet of paper is formed on a second wet part of a paper machine, said second jet of paper being formed from a second paste composition and comprising at least one reinforcement and / or authentication element as described above, said element being absent from said first paste composition and / or from said first jet, the two paper jets are assembled so 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.The paper can in particular be formed on a round-shaped paper machine comprising two or more sheet forming units, or a jet can be formed on a round form and another jet (or several other jets) on a former, or else the paper can be formed on a flat table multijet paper machine. Preferably when the paper has a watermark, the jet is formed with the watermark on a round shape with watermarked fabric and the other jet (or the other jets if necessary) on a former.
L'invention sera mieux comprise à l'aide des exemples qui suivent. Exemple 1 comparatif : 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 filigrane de format carré et ayant une surface de 310 cm . Le grammage du papier obtenu est de 85 g/m . Les planchettes fluorescentes s'observent qu'en partie, certaines étant trop enfouies dans la masse du papier.The invention will be better understood with the aid of the examples which follow. Comparative Example 1: A fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 part of red fluorescent boards is produced, and using a laboratory form apparatus suitable for applying a watermark motif in the mass of the paper obtained, a series of sheets of watermark paper of square format and having a surface of 310 cm. The grammage of the paper obtained is 85 g / m. The fluorescent boards are only partially observed, some being too buried in the bulk 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 filigrane de format carré et ayant une surface de 310 cm2.A first series of sheets is produced from a fibrous composition containing as fibers only cotton fibers, and using a laboratory form device suitable for applying a filigree pattern in the mass of the paper obtained. square format watermark paper with a surface area of 310 cm 2 .
Le grammage du papier de cette première série est de 55 g/m2.The grammage of the paper in 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 cm .A second series of sheets is then produced from a fibrous composition containing, on a dry weight basis, 100 parts of cotton fibers and 0.5 part of red fluorescent boards. square format and having a surface of 310 cm.
Le grammage du papier de cette seconde série est de 30 g/m .The grammage of the paper in this second series is 30 g / m.
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 complex obtained 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 cm .A first series of sheets of paper is produced from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 0.5 parts of green fluorescent fibers using a laboratory formwork apparatus. square format and having a surface of 310 cm.
Le grammage du papier de cette première série est de 30 g/m .The grammage of the paper in this first series is 30 g / m.
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 cm .Furthermore, using a fibrous composition containing, on a dry weight basis, 100 parts of cotton fibers and 0.5 part of red fluorescent boards, and using of a laboratory formatter a second series of sheets of square format and having a surface of 310 cm.
Le grammage du papier de cette seconde série est de 55 g/m2.The grammage of the paper in 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 complex obtained 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'œil 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 well observed.
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 favor, at constant grammage, 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 filigrane de format carré et ayant une surface de 310 cm2. Le grammage du papier obtenu est de 85 g/m2.A series of fibers is produced from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and using a laboratory form device suitable for applying a filigree pattern to the mass of the paper obtained. sheets of watermark paper in square format with an area of 310 cm 2 . The grammage of the paper obtained is 85 g / m 2 .
Exemple 5 comparatif : 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 filigrane 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 l,4 dtex.Comparative Example 5: A fiber composition containing as fibers only cotton fibers and 12 parts of synthetic fibers of polyethylene terephthalate is produced. (PET) as reinforcing fibers, and using a laboratory formatter suitable for applying a filigree pattern in the mass of the paper obtained, a series of filigree sheets of square format paper having an 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/m .The grammage of the paper obtained is 85 g / m.
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 filigrane de format carré et ayant une surface de 310 cm .A first series of sheets of paper is produced from a fibrous composition containing as fibers only cotton fibers, and using a laboratory form device suitable for applying a filigree pattern in the mass of the paper. watermark in square format and having a surface of 310 cm.
Le grammage du papier de cette première série est de 55 g/m .The grammage of the paper in this first series is 55 g / m.
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, on a dry weight basis, 100 parts of cotton fibers and 12 parts of synthetic polyethylene terephthalate fibers used in Example 5, and using a formwork apparatus. laboratory, a second series of square format sheets with a surface area of 310 cm 2 .
Le grammage du papier de cette seconde série est de 30 g/m .The grammage of the paper in this second series is 30 g / m.
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 complex obtained 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 filigrane de format carré et ayant une surface de 310 cm . Le grammage du papier de cette première série est de 55 g/m . On réalise par ailleurs, à l'aide d'un appareil à formette de laboratoire, une seconde •y série de feuilles de format carré et ayant une surface de 310 cm ' 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.A first series of watermarked sheets of paper is produced from a fibrous composition containing only cotton fibers as fibers and using a laboratory form device suitable for applying a filigree pattern in the mass of the paper. square format and having a surface of 310 cm. The grammage of the paper in this first series is 55 g / m. A second form of square format sheets having a surface area of 310 cm 2 is also produced, using a laboratory formatter, from a fibrous composition containing, by dry weight, 100 parts of cotton fibers and 12 parts fluorescent polyester fibers (PET fibers with the same characteristics as those used in Example 5) as reinforcing fibers and also playing the role of second authentication element.
Le grammage du papier de cette seconde série est de 30 g/m2. On assemble ensuite, à l'état humide, une feuille de la première série avec une feuille de la seconde série. On sèche le complexe obtenu.The grammage of the paper in this second series is 30 g / m 2 . Then, in the wet state, a sheet of the first series is assembled with a sheet of the second series. The complex obtained is dried.
Tests effectués dans les exemples 4 à 6 : On a d'abord évalué à l'aide de tests normalisés la résistance mécanique du papier dans chacun des exemples 4 à 6.Tests carried out in examples 4 to 6: The mechanical strength of the paper was first evaluated using standardized tests in each of examples 4 to 6.
En appliquant la norme NF EN 21974, on a ainsi évalué l'indice de déchirure des papiers obtenus.By applying standard NF EN 21974, 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 standard NF ISO 5626, the resistance to double ply was also evaluated.
On a ensuite évalué visuellement le rendu du filigrane dans chacun des exemples 4 àThe rendering of the watermark was then evaluated visually in each of Examples 4 to
6.6.
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 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 :It is also noted that the rendering of the watermark increases when the paper is separated into two jets, one containing the synthetic reinforcing fibers and the other the filigree pattern, as in Example 6. TABLE 1:

Claims

REVENDICATIONS
1 ) 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 du second jet.1) Security paper comprising at least two fibrous paper jets, the first jet being an external jet which comprises at least one authentication element and the other jet, known as the second jet, comprising: - a reinforcing element substantially absent from the first jet, said reinforcing element being chosen from materials improving mechanical resistance; and / or - another authentication element and the authentication element of said first jet being absent from the second jet.
2) Papier de sécurité selon la revendication précédente, caractérisé en ce 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.2) Security paper according to the preceding claim, characterized in that said reinforcing element is chosen from synthetic fibers, in particular polyester or polyamide fibers, natural textile fibers in particular abaca, hemp, flax fibers, chinook, and mixtures thereof.
3) Papier de sécurité selon la revendication précédente 2, caractérisé en ce que lesdites fibres de polyester sont des fibres de polyéthylène téréphtalate, en particulier elles sont présentes en une quantité comprise entre 10 et 20 parts en poids sec pour 100 parts des autres fibres dudit second jet.3) Security paper according to the preceding claim 2, characterized in that said polyester fibers are polyethylene terephthalate fibers, in particular they are present in an amount between 10 and 20 parts by dry weight per 100 parts of the other fibers of said second jet.
4) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que ledit élément d'authentification dudit premier jet, et le cas échéant celui dudit second jet, est détectable de manière optique.4) Security paper according to one of the preceding claims, characterized in that said authentication element of said first jet, and if necessary that of said second jet, is detectable optically.
5) Papier de sécurité selon la revendication précédente 4, caractérisé en ce que ledit 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.5) Security paper according to the preceding claim 4, characterized in that said authentication element is chosen from watermarks, iridescent particles, fibers or luminescent particles, in particularly fluorescent or phosphorescent, colored or thermochromic fibers or particles, in particular said particles are small boards.
6) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que ledit élément d'authentification de l'un des jets réagit à certaines stimulations en donnant un signal spécifique détectable à l'aide d'un appareil adapté.6) Security paper according to one of the preceding claims, characterized in that said authentication element of one of the jets reacts to certain stimuli by giving a specific signal detectable with the aid of a suitable device.
7) Papier de sécurité selon la revendication précédente 6, caractérisé en ce que ledit élément est choisi parmi les substances réagissant à des champs électromagnétiques, en particulier de type micro-onde.7) Security paper according to the preceding claim 6, characterized in that said element is chosen from substances reacting to electromagnetic fields, in particular of the microwave type.
8) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que ledit 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.8) Security paper according to one of the preceding claims, characterized in that said first external jet has a watermark as an authentication element and has a thickness substantially greater than that of said second jet or of the other jets, preferably approximately 1.5 to 2 times higher.
9) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que ledit élément de renfort a aussi une fonction d'authentification.9) Security paper according to one of the preceding claims, characterized in that said reinforcing element also has an authentication function.
10) Papier de sécurité selon la revendication précédente 9, caractérisé en ce que ledit élément de renfort constitue l'élément d'authentification dudit second jet.10) Security paper according to the preceding claim 9, characterized in that said reinforcing element constitutes the authentication element of said second jet.
1 1) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que ledit second jet comporte ledit élément de renfort et que ledit papier a un indice de déchirure supérieur ou égal à 10 mN.m2/g. 12) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que les jets sont à base de fibres de coton.1 1) Security paper according to one of the preceding claims, characterized in that said second jet comprises said reinforcing element and that said paper has a tear index greater than or equal to 10 mN.m 2 / g. 12) Security paper according to one of the preceding claims, characterized in that the jets are based on cotton fibers.
13) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que qu'il 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.13) Security paper according to one of the preceding claims, characterized in that it comprises three fibrous jets, said first external jet comprising an authentication element, said second jet being central and comprising said reinforcing element, and the third jet being another external jet comprising an authentication element which may be different from that of said first jet.
14) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce qu'il s'agit d'un papier billet de banque.14) Security paper according to one of the preceding claims, characterized in that it is a banknote paper.
15) Procédé de fabrication d'un papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que lesdits jets sont assemblés en phase humide.15) Method for manufacturing a security paper according to one of the preceding claims, characterized in that said jets are assembled in the wet phase.
16) Procédé de fabrication d'un papier de sécurité selon la revendication précédente, caractérisé en ce que ledit premier jet externe comporte un filigrane et est formé sur une machine à forme ronde comportant une toile filigraneuse. 16) A method of manufacturing a security paper according to the preceding claim, characterized in that said first external jet comprises a watermark and is formed on a round-shaped machine comprising a watermarked fabric.
EP04791542.6A 2003-10-15 2004-10-15 Multi-layer security paper Not-in-force EP1687484B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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

Publications (3)

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EP1687484A1 true EP1687484A1 (en) 2006-08-09
EP1687484B1 EP1687484B1 (en) 2010-12-29
EP1687484B2 EP1687484B2 (en) 2014-08-06

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EP (1) EP1687484B2 (en)
AT (1) ATE493546T1 (en)
BR (1) BRPI0415493B1 (en)
CA (1) CA2542196C (en)
DE (1) DE602004030822D1 (en)
ES (1) ES2358596T5 (en)
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Also Published As

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

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