EP1702110A1 - Security paper highly resistant to double folding and method for making same - Google Patents

Security paper highly resistant to double folding and method for making same

Info

Publication number
EP1702110A1
EP1702110A1 EP04817614A EP04817614A EP1702110A1 EP 1702110 A1 EP1702110 A1 EP 1702110A1 EP 04817614 A EP04817614 A EP 04817614A EP 04817614 A EP04817614 A EP 04817614A EP 1702110 A1 EP1702110 A1 EP 1702110A1
Authority
EP
European Patent Office
Prior art keywords
paper
security paper
fibrous
composition
jets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04817614A
Other languages
German (de)
French (fr)
Inventor
Henri Rosset
Pierre Doublet
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
ArjoWiggins Security 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
Application filed by ArjoWiggins SAS, ArjoWiggins Security SAS filed Critical ArjoWiggins SAS
Publication of EP1702110A1 publication Critical patent/EP1702110A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/32—Multi-ply with materials applied between the sheets
    • 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
    • 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
    • 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.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • 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.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential

Definitions

  • the present invention relates to a security paper and, more particularly to a security paper used 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.
  • the 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. 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.
  • This sheet has the advantage, in addition to that of comprising an authentication element, of improving the fold resistance of the security paper.
  • this manufacturing process requires several bonding steps to assemble the different sheets together and which are done offline from the paper machine, once the paper sheets have been produced (and therefore dried).
  • the paper could therefore on the one hand delaminate fairly easily and on the other hand be fairly easily manufactured by counterfeiters who can laminate sheets of paper with a plastic sheet.
  • It may also 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.
  • One of the aims of the invention is therefore to propose a new security paper and a method of obtaining security documents making it possible to reconcile both correct and reliable securing of said document, while giving it mechanical or chemical resistance, adapted to its usual use.
  • adding reinforcing elements using a coating technique In most applications requiring a support having better mechanical or physical characteristics, it is known to apply a layer on a basic support of the cellulose type. Such layers are traditionally applied on both sides of a sheet of dry paper using a size press, which consists of a pair of rollers forming a nip through which the sheet passes.
  • this layer deposition method has a number of disadvantages which reduce the efficiency of the paper machine as a whole.
  • Another object of the invention is therefore to propose a new process for depositing a layer on a fibrous strip, the process being both simple, inexpensive and easily adaptable to existing paper machines.
  • the Applicant had the idea of using liquid spraying devices to deposit a layer containing reinforcing elements on the surface of a paper being formed.
  • These liquid spraying devices indeed have few moving parts and require reduced maintenance. They are moreover easily adaptable to existing paper machines.
  • the object of the present invention is therefore to provide a security paper comprising at least two paper jets, in which, at least in one zone, at least one intermediate layer disposed between the two paper jets comprises at least one conferring element high resistance to double-fold paper, as defined in standard NF ISO 5626, the element being in "diffuse” form and / or in the form of particles and the two jets and said intermediate layer being intimately assembled.
  • “Diffuse” is understood to mean that the element was dissolved or in emulsion in the composition of the layer and is found distributed in a diffuse manner between said jets.
  • the term “element in the form of particles” means an element in the form of pigments, fibers, agglomerates and more generally of diverse shape and of small size.
  • the pigments can be of the order of a hundred micrometers to a nanometer; the fibers can be round or flat fibers, a few micrometers or millimeters or even centimeters long and a few micrometers or nanometers in diameter or in width.
  • said element is chosen from mineral pigments, in particular clays or titanium dioxide, pigments organic, natural or synthetic binders, in particular starches or polyvinyl alcohols or polyurethanes or styrene-butadiene copolymers, natural or synthetic fibers, in particular polyester or polyamide, and their mixtures.
  • organic pigments plastic coating pigments can be used, for example solid or hollow polystyrene microspheres.
  • natural fibers it is possible to use, for example, textile fibers such as abaca, hemp, flax or chinook fibers and their mixtures.
  • the element when it is a binder, such as polyurethanes or styrene-butadiene copolymers, it can be used in the form of a latex, that is to say an emulsion of a polymer in an aqueous medium.
  • the grammage of each jet is between 30 and 60 g / m 2 .
  • at least one of the paper jets has a watermark.
  • the intermediate layer also includes at least one authentication element.
  • the authentication element is detectable optically.
  • the authentication element is chosen from iridescent particles, fluorescent particles, phosphorescent particles, colored particles, planchettes. In particular, these particles can be fibers.
  • the authentication element reacts to certain stimuli by giving a specific signal detectable using an adapted device.
  • the authentication element is chosen from substances reacting to electromagnetic fields, in particular of the microwave or infrared or ultraviolet type. The elements providing resistance to the double fold can also play the role of authentication elements.
  • Another object of the invention is to protect a process for manufacturing a security paper having a high double-fold resistance in accordance with standard NF ISO 5626, as defined above, comprising the following steps: a first paste composition on a first drip cloth, the first dough composition is drained so as to form a first fibrous mat, a second dough composition is deposited on a second drip cloth, - the second composition is drained of paste so as to form a second fibrous mat, a liquid mixture comprising at least one soluble element or in emulsion or in the form of particles conferring said high resistance to double ply is sprayed onto at least one of said fibrous mat, assembling said first fibrous mattress to said second fibrous mattress so as to form a unitary fibrous mattress.
  • liquid composition means a composition produced in a liquid medium; such a liquid composition may be a suspension, an emulsion or a solution.
  • the liquid medium is aqueous.
  • said composition is sprayed.
  • at least one watermark is formed in the first and / or in the second fibrous mat.
  • a liquid composition containing at least one authentication element is projected onto said first and / or said second fibrous mat.
  • the draining of the first or of the second paste composition is carried out using a Fourdrinier cloth, a double cloth or a cylinder of round shape.
  • additional steps are provided for pressing and drying the unitary fibrous mat. The invention will be better understood using the examples presented below.
  • a series of sheets of square format paper with a surface is produced from a fibrous composition containing, by dry weight, 100 parts of pure cotton cellulose fibers. 310 cm.
  • the grammage of the paper obtained is 85 g / m.
  • the laboratory formatter apparatus has been adapted to apply a watermark pattern in the mass of the paper obtained.
  • a fibrous composition containing, on a dry weight basis, 100 parts of pure cotton cellulose fibers and 12 parts of synthetic polyethylene terephthalate fibers is produced, and using a laboratory formwork apparatus, a series of square sheets of paper with a surface area of 310 cm. The grammage of the paper obtained is 85 g / m.
  • the laboratory formatter apparatus has been adapted to apply a watermark pattern in the mass of the paper obtained.
  • a fi rst composition of square-shaped sheets of paper is produced from a fibrous composition containing, by dry weight, 100 parts of pure cotton cellulose fibers, and using a laboratory formwork apparatus. surface of 310 cm.
  • the grammage of the paper in this first series is 40 g / m.
  • the laboratory formatter in this series has been adapted to apply a watermark pattern in the mass of the paper.
  • the grammage of the paper in this second series is 40 g / m.
  • a small manual sprayer approximately 8 g / m 2 by dry weight of a coating composition comprising a carboxylated styrene butadiene copolymer latex ( in aqueous emulsion).
  • a sheet of the first series is assembled with a sheet of the second series, the coated side of the sheet of the second series being covered by the sheet of the first series.
  • the complex obtained is dried.
  • the percentage by dry weight of latex is then about 0.09.
  • the jet from the round machine and the jet from the former are assembled.
  • About 2.5 g / m dry weight of a coating composition comprising a carboxylated polyvinyl alcohol is deposited by means of a size press.
  • the complex obtained is dried.
  • the grammage of the complex obtained is then 83.1 g / m.
  • the grammage of the complex obtained is then 82.7 g / m 2 .
  • the percentage by dry weight of polyvinyl carboxylated alcohol is then about 0.03.
  • Table 2 gives the results of the tests carried out for Examples 4 and 5.
  • Example 4 the whiteness of the paper in Comparative Example 4 is slightly lower than that of Example 5 according to the invention.
  • a surface layer deposition tends to affect the surface characteristics of the paper, while the spray deposition between two jets of paper, as envisaged by the invention, is of no consequence for these same characteristics.
  • a minimum double-ply resistance DPmin has been defined for each of the examples, a value corresponding to a limit below which the paper must be considered as not being sufficiently resistant, taking into account the needs of the users. This value has been expressed, for reasons of simplification, in a single formula in order to be able to adapt it to the different types of paper present, in particular as a function of the weight of layer deposited.
  • DP min 75000 X (percentage by dry weight of the mechanical reinforcement elements present in the layer compared to the paper) This value was calculated , in Table 1, using the percentage by dry weight of latex in the paper of Example 3 and, in Table 2, using the percentage by dry weight of polyvinyl carboxylated alcohol in the paper of Example 5 It can be seen that, in comparative examples 1, 2 and 4, the double-ply resistance values are all lower than the imposed DP min value. On the contrary, in the examples according to the invention, these values are quite much higher than the imposed value DP min.

Abstract

The invention concerns a security paper comprising at least two plies of paper, wherein at least one intermediate layer arranged between the two plies of paper comprises at least one element providing the paper with high double folding resistance, such as defined by the NF ISO 5626 standard, the two plies and said intermediate layer being closely assembled. The invention also concerns a method for making said paper whereby the intermediate layer is deposited by spraying.

Description

PAPIER DE SECURITE POSSEDANT UNE RESISTANCE AU DOUBLE-PLI ELEVEE ET SON PROCEDE DE FABRICATION SECURITY PAPER HAVING HIGH DOUBLE-FOLD RESISTANCE AND MANUFACTURING METHOD THEREOF
La présente invention est relative à un papier de sécurité et, plus particulièrement à un papier de sécurité utilisé 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. Les 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. 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. A ce titre, il est courant de prévoir des zones de moindre épaisseur au sein de la couche fibreuse, formant ainsi un filigrane dans le document de sécurité final, ledit filigrane empêchant notamment la reproduction dudit document par photocopie. Parallèlement à ces problèmes liés à l' authentification et à la prévention des contrefaçons des documents de sécurité, il est également essentiel d'assurer une durabilité suffisante à ces documents de sécurité, soumis à des contraintes répétées 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. Dans la demande de brevet EP-A-628408, on décrit un papier de sécurité renforcé constitué de deux feuilles de papier entre lesquelles est contrecollée une feuille de plastique. Cette feuille a l'avantage, outre celui de comporter un élément d' authentification, d'améliorer la résistance au pli du papier de sécurité. Toutefois ce procédé de fabrication nécessite plusieurs étapes de collage pour assembler les différentes feuilles entre elles et qui se font hors ligne de la machine à papier, une fois les feuilles de papier fabriquées (et donc séchées). Le papier pourrait donc d'une part se délaminer assez aisément et d'autre part être assez facilement fabriqué par des faussaires qui peuvent contrecoller des feuilles de papier avec une feuille de plastique. Il peut par ailleurs 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 des buts de l'invention est donc de proposer un nouveau papier de sécurité et un mode d'obtention de documents de sécurité permettant de concilier à la fois une sécurisation correcte et fiable dudit document, tout en lui conférant une résistance mécanique ou chimique, adaptée à son usage habituel. A ce titre, on peut envisager d'ajouter des éléments de renfort à l'aide d'une technique de couchage. Dans la plupart des applications nécessitant un support possédant de meilleures caractéristiques mécaniques ou physiques, il est connu d'appliquer une couche sur un support de base de type cellulosique. De telles couches sont traditionnellement appliquées des deux côtés d'une feuille de papier sèche à l'aide d'une presse encolleuse, qui se compose d'une paire de rouleaux formant une zone de pincement à travers laquelle la feuille passe. Cette méthode de dépôt de couche présente toutefois un certain nombre de désavantages qui réduisent l'efficacité de la machine à papier dans son ensemble. Les presses encolleuses possèdent en effet un grand nombre de parties mobiles, ce qui nécessitent des ajustages fréquents et entraînent des temps de maintenance et de nettoyage non négligeables. Dans certaines applications, il a été prévu également des dispositifs de couchage annexes, positionnés à la suite de la machine à papier elle-même. Ces dispositifs présentent l'inconvénient majeur d'augmenter fortement l'espace occupée par la machine à papier et d'engendrer une consommation accrue d'énergie pour sécher le papier ainsi réhumidifié. Un autre but de l'invention est donc de proposer un nouveau procédé de dépôt de couche sur une bande fibreuse, le procédé étant à la fois simple, peu onéreux et facilement adaptable sur les machines à papier existantes. A ce titre, la Demanderesse a eu l'idée d'utiliser des dispositifs de projection de liquide pour déposer une couche contenant des éléments de renfort sur la surface d'un papier en formation. Ces dispositifs de projection de liquide possèdent en effet peu de parties mobiles et nécessitent une maintenance réduite. Ils sont de plus aisément adaptables sur les machines à papier existantes. Par ailleurs, constatant qu'un dépôt de couche sur une face seulement du papier entraînait une dissymétrie dans les propriétés physiques et mécaniques du papier entre la face enduite et la face non enduite, la Demanderesse a également eu l'idée de projeter la couche entre deux jets de papier assemblés ensuite, pressés ensemble et séchés de manière traditionnelle. Cette technique présente en outre l'avantage de ne pas modifier les propriétés de surface du papier de base, ce qui peut être utile notamment pour les papiers destinés à l'impression. L'objet de la présente invention est donc de fournir un papier de sécurité comprenant au moins deux jets de papier, dans lequel, au moins dans une zone, au moins une couche intermédiaire disposée entre les deux jets de papier comporte au moins un élément conférant au papier une résistance au double-pli élevée, telle que définie dans la norme NF ISO 5626, l'élément se trouvant sous forme « diffus » et/ou sous forme de particules et les deux jets et ladite couche intermédiaire étant intimement assemblés.The present invention relates to a security paper and, more particularly to a security paper used 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. The 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. 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. As such, it is common to provide areas of reduced thickness within the fibrous layer, thus forming a watermark in the final security document, said watermark preventing in particular the reproduction of said document by photocopying. In addition to these problems linked to the authentication and prevention of counterfeit security documents, it is also essential to ensure sufficient durability for these security documents, which are subjected to repeated constraints during their use. 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 to this level, can lead to rapid deterioration or even tearing of said ticket. In patent application EP-A-628408, a reinforced security paper is described which consists of two sheets of paper between which a plastic sheet is laminated. This sheet has the advantage, in addition to that of comprising an authentication element, of improving the fold resistance of the security paper. However, this manufacturing process requires several bonding steps to assemble the different sheets together and which are done offline from the paper machine, once the paper sheets have been produced (and therefore dried). The paper could therefore on the one hand delaminate fairly easily and on the other hand be fairly easily manufactured by counterfeiters who can laminate sheets of paper with a plastic sheet. It may also 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. One of the aims of the invention is therefore to propose a new security paper and a method of obtaining security documents making it possible to reconcile both correct and reliable securing of said document, while giving it mechanical or chemical resistance, adapted to its usual use. As such, one can consider adding reinforcing elements using a coating technique. In most applications requiring a support having better mechanical or physical characteristics, it is known to apply a layer on a basic support of the cellulose type. Such layers are traditionally applied on both sides of a sheet of dry paper using a size press, which consists of a pair of rollers forming a nip through which the sheet passes. However, this layer deposition method has a number of disadvantages which reduce the efficiency of the paper machine as a whole. The size presses indeed have a large number of moving parts, which require frequent adjustments and lead to significant maintenance and cleaning times. In certain applications, additional coating devices have also been provided, positioned after the paper machine itself. These devices have the major drawback of greatly increasing the space occupied by the paper machine and of generating increased energy consumption for drying the paper thus rewetted. Another object of the invention is therefore to propose a new process for depositing a layer on a fibrous strip, the process being both simple, inexpensive and easily adaptable to existing paper machines. As such, the Applicant had the idea of using liquid spraying devices to deposit a layer containing reinforcing elements on the surface of a paper being formed. These liquid spraying devices indeed have few moving parts and require reduced maintenance. They are moreover easily adaptable to existing paper machines. Furthermore, noting that depositing a layer on only one side of the paper led to an asymmetry in the physical and mechanical properties of the paper between the coated side and the uncoated side, the Applicant also had the idea of projecting the layer between two jets of paper then assembled, pressed together and dried in the traditional way. This technique also has the advantage of not modifying the surface properties of the base paper, which can be useful in particular for papers intended for printing. The object of the present invention is therefore to provide a security paper comprising at least two paper jets, in which, at least in one zone, at least one intermediate layer disposed between the two paper jets comprises at least one conferring element high resistance to double-fold paper, as defined in standard NF ISO 5626, the element being in "diffuse" form and / or in the form of particles and the two jets and said intermediate layer being intimately assembled.
On entend par «diffus » que l'élément était solubilisé ou en émulsion dans la composition de la couche et se retrouve réparti de manière diffuse entre lesdits jets. On entend par « élément sous forme de particules » un élément sous forme de pigments, fibres, agglomérats et plus généralement de forme diverse et de petite taille. Les pigments peuvent être de l'ordre d'une centaine de micromètres jusqu'au nanomètre ; les fibres peuvent être des fibres rondes ou plates, faire quelques micromètres ou millimètres voire centimètres de long et quelques micromètres ou nanomètres de diamètre ou de largeur.“Diffuse” is understood to mean that the element was dissolved or in emulsion in the composition of the layer and is found distributed in a diffuse manner between said jets. The term “element in the form of particles” means an element in the form of pigments, fibers, agglomerates and more generally of diverse shape and of small size. The pigments can be of the order of a hundred micrometers to a nanometer; the fibers can be round or flat fibers, a few micrometers or millimeters or even centimeters long and a few micrometers or nanometers in diameter or in width.
On entend par « les deux jets et ladite couche intermédiaire étant intimement assemblés » que des constituants de chacun des jets et également ceux de la composition de la couche (dont ledit élément) se sont partiellement interpénétrés; il serait impossible, une fois le papier séché, de séparer de façon nette les jets à l'endroit de leur jonction. Une observation en coupe au microscope notamment électronique permet de voir l'assemblage intime de ces deux jets et dudit élément alors que si la couche avait été disposée entre les deux papiers une fois secs, on observerait un assemblage moins intime à la fois entre les jets et également avec les constituants de la couche. Un tel assemblage peut être obtenu comme décrit plus loin en assemblant directement les deux jets et la composition c'est-à-dire que la composition est projetée entre les jets, notamment sur au moins l'un des deux jets, encore humides et sont assemblés immédiatement (quand ils sont humides). Plus particulièrement, ladite couche intermédiaire a été disposée par projection, en particulier par pulvérisation, d'une composition comportant ledit élément. De préférence la surface entre les deux jets est entièrement recouverte par ladite couche. Selon un mode préféré de l'invention, la résistance au double-pli du papier est supérieure à une valeur DPmin, avec DPmin=75000 E, E étant le pourcentage en poids sec de l'élément dans le papier. Selon un mode particulier de l'invention, ledit élément est choisi parmi les pigments minéraux notamment les argiles ou le dioxyde de titane, les pigments organiques, les liants naturels ou synthétiques notamment les amidons ou les alcools polyvinyliques ou les polyuréthanes ou les copolymères de styrène-butadiène, les fibres naturelles ou synthétiques notamment de polyester ou de polyamide, et leurs mélanges. Comme pigments organiques on peut utiliser des pigments plastiques de couchage, par exemple des microsphères pleines ou creuses de polystyrène. Comme fibres naturelles on peut utiliser par exemple les fibres textiles comme les fibres d'abaca, de chanvre, de lin ou de chinook et leurs mélanges. Plus particulièrement, lorsque l'élément est un liant, comme les polyuréthanes ou les copolymères styrène-butadiène, il peut être utilisé sous forme de latex c'est-à-dire d'une émulsion d'un polymère en milieu aqueux. De préférence le grammage de chaque jet est compris entre 30 et 60 g/m2. Selon un autre mode particulier de l'invention, au moins un des jets de papier comporte un filigrane. Selon un autre mode particulier de l'invention, la couche intermédiaire comporte également au moins un élément d' authentification. Selon un autre mode particulier de l'invention, l'élément d' authentification est détectable de manière optique. Selon un autre mode particulier de l'invention, l'élément d' authentification est choisi parmi les particules iridescentes, les particules fluorescentes, les particules phosphorescentes, les particules colorées, les planchettes. En particulier ces particules peuvent être des fibres. Selon un autre mode particulier de l'invention, l'élément d' authentification réagit à certaines stimulations en donnant un signal spécifique détectable à l'aide d'un appareil adapté. Selon un autre mode particulier de l'invention, l'élément d' authentification est choisi parmi les substances réagissant à des champs électromagnétiques, en particulier de type micro-onde ou infra-rouge ou ultra- violet. Les éléments apportant la résistance au double-pli peuvent aussi jouer le rôle des éléments d'authentification. Un autre objet de l'invention est de protéger un procédé de fabrication d'un papier de sécurité ayant une résistance au double-pli élevée conformément à la norme NF ISO 5626, tel que défini ci-dessus, comprenant les étapes suivantes : on dépose une première composition de pâte sur une première toile d'égouttage, on égoutte la première composition de pâte de manière à former un premier matelas fibreux, on dépose une seconde composition de pâte sur une seconde toile d'égouttage, - on égoutte la seconde composition de pâte de manière à former un second matelas fibreux, on projette sur au moins l'un desdits matelas fibreux un mélange liquide comprenant au moins un élément soluble ou en émulsion ou sous forme de particules conférant ladite résistance au double-pli élevée, - on assemble ledit premier matelas fibreux audit second matelas fibreux de manière à former un matelas fibreux unitaire. On entend par composition liquide, une composition réalisée en milieu liquide ; une telle composition liquide peut être une suspension, une émulsion ou une solutioo. De préférence le milieu liquide est aqueux. De préférence, ladite composition est projetée par pulvérisation. Selon un mode particulier de l'invention, on forme au moins un filigrane dans le premier et/ou dans le second matelas fibreux. Selon un autre mode particulier de l'invention, on projette sur ledit premier et/ou ledit second matelas fibreux une composition liquide contenant au moins un élément d'authentification. Selon un autre mode particulier de l'invention, l'égouttage de la première ou de la seconde composition de pâte est effectuée à l'aide d'une toile Fourdrinier, d'une double toile ou d'un cylindre de forme ronde. Selon un autre mode particulier de l'invention, il est prévu des étapes supplémentaires de pressage et de séchage du matelas fibreux unitaire. L'invention sera mieux comprise à l'aide des exemples présentés ci-dessous.It is understood by "the two jets and said intermediate layer being intimately assembled" that the constituents of each of the jets and also those of the composition of the layer (including said element) have partially interpenetrated; once the paper is dry, it would be impossible to separate the jets neatly where they meet. A cross-sectional observation under a microscope, in particular electronic, makes it possible to see the intimate assembly of these two jets and of said element whereas if the layer had been placed between the two papers once dry, we would observe a less intimate assembly both between the jets and also with the constituents of the layer. Such an assembly can be obtained as described below by directly assembling the two jets and the composition, that is to say that the composition is sprayed between the jets, in particular on at least one of the two jets, which are still wet and are assembled immediately (when wet). More particularly, said intermediate layer has been arranged by spraying, in particular by spraying, of a composition comprising said element. Preferably the surface between the two jets is entirely covered by said layer. According to a preferred embodiment of the invention, the resistance to double-fold of the paper is greater than a value DPmin, with DPmin = 75000 E, E being the percentage by dry weight of the element in the paper. According to a particular embodiment of the invention, said element is chosen from mineral pigments, in particular clays or titanium dioxide, pigments organic, natural or synthetic binders, in particular starches or polyvinyl alcohols or polyurethanes or styrene-butadiene copolymers, natural or synthetic fibers, in particular polyester or polyamide, and their mixtures. As organic pigments, plastic coating pigments can be used, for example solid or hollow polystyrene microspheres. As natural fibers, it is possible to use, for example, textile fibers such as abaca, hemp, flax or chinook fibers and their mixtures. More particularly, when the element is a binder, such as polyurethanes or styrene-butadiene copolymers, it can be used in the form of a latex, that is to say an emulsion of a polymer in an aqueous medium. Preferably, the grammage of each jet is between 30 and 60 g / m 2 . According to another particular embodiment of the invention, at least one of the paper jets has a watermark. According to another particular embodiment of the invention, the intermediate layer also includes at least one authentication element. According to another particular mode of the invention, the authentication element is detectable optically. According to another particular embodiment of the invention, the authentication element is chosen from iridescent particles, fluorescent particles, phosphorescent particles, colored particles, planchettes. In particular, these particles can be fibers. According to another particular mode of the invention, the authentication element reacts to certain stimuli by giving a specific signal detectable using an adapted device. According to another particular mode of the invention, the authentication element is chosen from substances reacting to electromagnetic fields, in particular of the microwave or infrared or ultraviolet type. The elements providing resistance to the double fold can also play the role of authentication elements. Another object of the invention is to protect a process for manufacturing a security paper having a high double-fold resistance in accordance with standard NF ISO 5626, as defined above, comprising the following steps: a first paste composition on a first drip cloth, the first dough composition is drained so as to form a first fibrous mat, a second dough composition is deposited on a second drip cloth, - the second composition is drained of paste so as to form a second fibrous mat, a liquid mixture comprising at least one soluble element or in emulsion or in the form of particles conferring said high resistance to double ply is sprayed onto at least one of said fibrous mat, assembling said first fibrous mattress to said second fibrous mattress so as to form a unitary fibrous mattress. The term “liquid composition” means a composition produced in a liquid medium; such a liquid composition may be a suspension, an emulsion or a solution. Preferably the liquid medium is aqueous. Preferably, said composition is sprayed. According to a particular embodiment of the invention, at least one watermark is formed in the first and / or in the second fibrous mat. According to another particular embodiment of the invention, a liquid composition containing at least one authentication element is projected onto said first and / or said second fibrous mat. According to another particular embodiment of the invention, the draining of the first or of the second paste composition is carried out using a Fourdrinier cloth, a double cloth or a cylinder of round shape. According to another particular embodiment of the invention, additional steps are provided for pressing and drying the unitary fibrous mat. The invention will be better understood using the examples presented below.
Exemple 1 comparatif :Comparative example 1:
On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de cellulose pure de coton et à l'aide d'un appareil à formette de laboratoire une série de feuilles de papier de format carrée et ayant une surface de 310 cm .A series of sheets of square format paper with a surface is produced from a fibrous composition containing, by dry weight, 100 parts of pure cotton cellulose fibers. 310 cm.
Le grammage du papier obtenu est de 85 g/m .The grammage of the paper obtained is 85 g / m.
En outre, l'appareil à formette de laboratoire a été adapté pour appliquer un motif filigrane dans la masse du papier obtenu.In addition, the laboratory formatter apparatus has been adapted to apply a watermark pattern in the mass of the paper obtained.
Exemple 2 comparatif :Comparative example 2:
On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de cellulose pure de coton et 12 parts de fibres synthétiques de polyéthylène téréphtalate, et à l'aide d'un appareil à formette de laboratoire une série de feuilles de papier de format carré et ayant une surface de 310 cm . Le grammage du papier obtenu est de 85 g/m .A fibrous composition containing, on a dry weight basis, 100 parts of pure cotton cellulose fibers and 12 parts of synthetic polyethylene terephthalate fibers is produced, and using a laboratory formwork apparatus, a series of square sheets of paper with a surface area of 310 cm. The grammage of the paper obtained is 85 g / m.
En outre, l'appareil à formette de laboratoire a été adapté pour appliquer un motif filigrane dans la masse du papier obtenu.In addition, the laboratory formatter apparatus has been adapted to apply a watermark pattern in the mass of the paper obtained.
Exemple 3 :Example 3:
On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de cellulose pure de coton et 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 . Le grammage du papier de cette première série est de 40 g/m . En outre, l'appareil à formette de laboratoire dans cette série a été adapté pour appliquer un motif filigrane dans la masse du papier.A fi rst composition of square-shaped sheets of paper is produced from a fibrous composition containing, by dry weight, 100 parts of pure cotton cellulose fibers, and using a laboratory formwork apparatus. surface of 310 cm. The grammage of the paper in this first series is 40 g / m. In addition, the laboratory formatter in this series has been adapted to apply a watermark pattern in the mass of the paper.
On réalise ensuite à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de cellulose pure de coton et à l'aide d'un appareil à formette de laboratoire une seconde série de feuilles de papier de format carré et ayant une surface de 310 cm2.Then produced from a fibrous composition containing, by dry weight, 100 parts of pure cotton cellulose fibers and using a laboratory formatter, a second series of sheets of paper of square format and having an area of 310 cm 2 .
Le grammage du papier de cette seconde série est de 40 g/m . On dépose, à l'aide d'un petit pulvérisateur manuel, sur une face d'un papier de la seconde série environ 8 g/m2 en poids sec d'une composition de couchage comprenant un latex de copolymère de styrène butadiène carboxylé (en émulsion aqueuse). On assemble ensuite, à l'état humide, une feuille de la première série avec une feuille de la seconde série, la face couchée de la feuille de la seconde série étant recouverte par la feuille de la première série. On sèche le complexe obtenu. Dans ce complexe, le pourcentage en poids sec de latex est alors d'environ 0,09.The grammage of the paper in this second series is 40 g / m. Using a small manual sprayer, approximately 8 g / m 2 by dry weight of a coating composition comprising a carboxylated styrene butadiene copolymer latex ( in aqueous emulsion). Then, in the wet state, a sheet of the first series is assembled with a sheet of the second series, the coated side of the sheet of the second series being covered by the sheet of the first series. The complex obtained is dried. In this complex, the percentage by dry weight of latex is then about 0.09.
Exemple 4 comparatif :Comparative example 4:
On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de cellulose pure de coton et à l'aide d'une machine à papier de type forme ronde-former deux jets de papier.It is made from a fibrous composition containing, by dry weight, 100 parts of pure cotton cellulose fibers and using a paper machine of the round shape type - forming two jets of paper.
On assemble, à l'état humide, le jet de la machine forme ronde et le jet du former. On dépose, au moyen d'une presse encolleuse, environ 2,5 g/m en poids sec d'une composition de couchage comprenant un alcool polyvinylique carboxylé.In the wet state, the jet from the round machine and the jet from the former are assembled. About 2.5 g / m dry weight of a coating composition comprising a carboxylated polyvinyl alcohol is deposited by means of a size press.
On sèche le complexe obtenu.The complex obtained is dried.
Le grammage du complexe obtenu est alors de 83,1 g/m .The grammage of the complex obtained is then 83.1 g / m.
Exemple 5 :Example 5:
On réalise à partir d'une composition fibreuse contenant, en poids sec, 100 parts de fibres de cellulose pure de coton et à l'aide d'une machine à papier de type forme ronde-former deux jets de papier.It is made from a fibrous composition containing, by dry weight, 100 parts of pure cotton cellulose fibers and using a paper machine of the round shape type - forming two jets of paper.
On pulvérise sur une face du jet de papier provenant du former, à l'aide d'une rampe de trois buses de pulvérisation espacées de 10 cm et positionnées à environ 9 cm de la feuille, environ 2,5 g/m en poids sec d'une composition de couchage comprenant un alcool polyvinylique carboxylé.One spray on one side of the paper jet coming from the forming, using a ramp of three spray nozzles spaced 10 cm apart and positioned about 9 cm from the sheet, about 2.5 g / m dry weight a coating composition comprising a carboxylated polyvinyl alcohol.
On assemble, à l'état humide, le jet de la machine forme ronde et le jet du former, la face couchée du jet provenant du former étant recouverte par le jet de la forme ronde. On sèche le complexe obtenu.In the wet state, the jet of the machine in the round shape and the jet of the former are assembled, the coated side of the jet coming from the former being covered by the jet of the round former. The complex obtained is dried.
Le grammage du complexe obtenu est alors de 82,7 g/m2. Dans ce complexe, le pourcentage en poids sec d'alcool polyvinylique carboxylé est alors d'environ 0,03.The grammage of the complex obtained is then 82.7 g / m 2 . In this complex, the percentage by dry weight of polyvinyl carboxylated alcohol is then about 0.03.
Tests effectués dans les exemples 1 à 3 : On a d'abord évalué à l'aide de tests normalisés la résistance mécanique du papier dans chacun des exemples 1 à 3.Tests carried out in examples 1 to 3: The mechanical strength of the paper was first evaluated using standardized tests in each of examples 1 to 3.
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 an double- pli.By applying standard NF ISO 5626, the double-ply resistance was also evaluated.
On a ensuite évalué visuellement le rendu du filigrane dans chacun des exemples 1 à 3.The rendering of the watermark was then evaluated visually in each of Examples 1 to 3.
Tests effectués dans les exemples 4 et 5 :Tests carried out in Examples 4 and 5:
On a d'abord évalué à l'aide de tests normalisés la résistance mécanique du papier dans chacun des exemples 4 et 5.The mechanical strength of the paper was first evaluated using standardized tests in each of Examples 4 and 5.
En appliquant la norme NF ISO 5626, on a ainsi évalué la résistance au double-pli. On a également comparé l'état de surface des papiers obtenus dans les exemples 4 et 5. En appliquant la norme NF ISO 2470, on a ainsi évalué la blancheur des papiers.By applying the NF ISO 5626 standard, the resistance to double ply was thus evaluated. The surface condition of the papers obtained in Examples 4 and 5 was also compared. By applying standard NF ISO 2470, the whiteness of the papers was thus evaluated.
Résultats des tests :Test results:
Le tableau 1 ci-dessous donne les résultats des tests effectués pour les exemples 1 à 3.Table 1 below gives the results of the tests carried out for Examples 1 to 3.
On constate que la résistance mécanique du papier augmente lorsque l'on pulvérise un latex entre les jets de papier et lorsque l'on introduit des fibres synthétiques dans la composition fibreuse. Toutefois, on constate que le rendu du filigrane reste correct dans l'exemple 3 correspondant à l'invention, alors que, dans l'exemple 2 comparatif, ce filigrane a pratiquement disparu.It is found that the mechanical resistance of the paper increases when a latex is sprayed between the paper jets and when synthetic fibers are introduced into the fibrous composition. However, it can be seen that the rendering of the watermark remains correct in Example 3 corresponding to the invention, whereas, in Comparative Example 2, this watermark has practically disappeared.
Le tableau 2 donne les résultats des tests effectués pour les exemples 4 et 5.Table 2 gives the results of the tests carried out for Examples 4 and 5.
On constate que la blancheur du papier dans l'exemple comparatif 4 est légèrement inférieure à celle de l'exemple 5 selon l'invention. Cela confirme qu'un dépôt de couche en surface a tendance à affecter les caractéristiques de surface du papier, alors que le dépôt par pulvérisation entre deux jets de papier, comme l'envisage l'invention, est sans conséquence pour ces mêmes caractéristiques. Par ailleurs, on a défini une résistance au double-pli minimale DPmin pour chacun des exemples, valeur correspondant à une limite en dessous de laquelle le papier doit être considéré comme n'étant pas assez résistant, compte-tenu des besoins des utilisateurs. Cette valeur a été exprimée, pour des raisons de simplification, en une formule unique pour pouvoir l'adapter aux différents types de papier en présence, en particulier en fonction du poids de couche déposée.It can be seen that the whiteness of the paper in Comparative Example 4 is slightly lower than that of Example 5 according to the invention. This confirms that a surface layer deposition tends to affect the surface characteristics of the paper, while the spray deposition between two jets of paper, as envisaged by the invention, is of no consequence for these same characteristics. Furthermore, a minimum double-ply resistance DPmin has been defined for each of the examples, a value corresponding to a limit below which the paper must be considered as not being sufficiently resistant, taking into account the needs of the users. This value has been expressed, for reasons of simplification, in a single formula in order to be able to adapt it to the different types of paper present, in particular as a function of the weight of layer deposited.
En effet, plus le taux de couche augmente dans le papier, plus la résistance au double- pli minimale exigée sera grande.In fact, the more the layer rate increases in the paper, the greater the minimum double-fold resistance required.
Par extrapolation, nous avons défini une valeur DP min de résistance au double-pli minimale par la formule : DP min = 75000 X ( pourcentage en poids sec des éléments de renfort mécanique présents dans la couche par rapport au papier) Cette valeur a été calculée, dans le tableau 1, en utilisant le pourcentage en poids sec de latex dans le papier de l'exemple 3 et, dans le tableau 2, en utilisant le pourcentage en poids sec d'alcool polyvinylique carboxylé dans le papier de l'exemple 5. On constate que, dans les exemples comparatifs 1,2 et 4, les valeurs de résistance au double-pli sont toutes inférieures à la valeur DP min imposée. Au contraire, dans les exemples selon l'invention, ces valeurs sont assez largement supérieures à la valeur DP min imposée. By extrapolation, we defined a minimum DP min value of double-ply resistance by the formula: DP min = 75000 X (percentage by dry weight of the mechanical reinforcement elements present in the layer compared to the paper) This value was calculated , in Table 1, using the percentage by dry weight of latex in the paper of Example 3 and, in Table 2, using the percentage by dry weight of polyvinyl carboxylated alcohol in the paper of Example 5 It can be seen that, in comparative examples 1, 2 and 4, the double-ply resistance values are all lower than the imposed DP min value. On the contrary, in the examples according to the invention, these values are quite much higher than the imposed value DP min.
TABLEAU 1TABLE 1
TABLEAU 2TABLE 2

Claims

REVENDICATIONS
1) Papier de sécurité comprenant au moins deux jets de papier dans lequel, au moins dans une zone, au moins une couche intermédiaire disposée entre les deux jets de papier comporte au moins un élément conférant au papier une résistance au double-pli élevée, telle que définie dans la norme NF ISO 5626, ledit élément se trouvant sous forme « diffus » et/ou sous forme de particules et les deux jets et ladite couche intermédiaire étant intimement assemblés.1) Security paper comprising at least two jets of paper in which, at least in one zone, at least one intermediate layer disposed between the two jets of paper comprises at least one element giving the paper a high double-ply resistance, such as defined in standard NF ISO 5626, said element being in “diffuse” form and / or in the form of particles and the two jets and said intermediate layer being intimately assembled.
2) Papier de sécurité selon la revendication 1, caractérisé en ce que ladite couche a été disposée par projection d'une composition comportant ledit élément. 3) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que la surface entre les deux jets est entièrement recouverte par ladite couche.2) Security paper according to claim 1, characterized in that said layer has been arranged by projection of a composition comprising said element. 3) Security paper according to one of the preceding claims, characterized in that the surface between the two jets is entirely covered by said layer.
4) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que le grammage de chaque jet est compris entre 30 et 60 g/m2 4) Security paper according to one of the preceding claims, characterized in that the grammage of each jet is between 30 and 60 g / m 2
5) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que la résistance au double-pli du papier est supérieure à une valeur DPmin, avec : DPmin=75000 E, E étant le pourcentage en poids sec de l'élément dans le papier.5) Security paper according to one of the preceding claims, characterized in that the resistance to double-fold of the paper is greater than a value DPmin, with: DPmin = 75000 E, E being the percentage by dry weight of the element in the paper.
6) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que ledit élément est choisi parmi les pigments minéraux notamment les argiles ou le dioxyde de titane, les pigments organiques, les liants naturels ou synthétiques notamment les amidons ou les alcools polyvinyliques, les polyuréthanes ou les copolymères de styrène-butadiène, les fibres naturelles ou synthétiques notamment de polyester ou de polyamide et leurs mélanges.6) Security paper according to one of the preceding claims, characterized in that the said element is chosen from mineral pigments, in particular clays or titanium dioxide, organic pigments, natural or synthetic binders, in particular starches or polyvinyl alcohols, polyurethanes or styrene-butadiene copolymers, natural or synthetic fibers, in particular polyester or polyamide and their mixtures.
7) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce qu'au moins un des jets de papier comporte un filigrane.7) Security paper according to one of the preceding claims, characterized in that at least one of the paper jets has a watermark.
8) Papier de sécurité selon l'une des revendications précédentes, caractérisé en ce que la couche intermédiaire comporte également au moins un élément d'authentification.8) Security paper according to one of the preceding claims, characterized in that the intermediate layer also comprises at least one authentication element.
9) Papier de sécurité selon la revendication précédente 8, caractérisé en ce que l'élément d'authentification est détectable de manière optique.9) Security paper according to the preceding claim 8, characterized in that the authentication element is detectable optically.
10) Papier de sécurité selon la revendication précédente 9, caractérisé en ce que l'élément d'authentification est choisi parmi les particules iridescentes, les particules fluorescentes, les particules phosphorescentes, les particules colorées, les planchettes.10) Security paper according to the preceding claim 9, characterized in that the authentication element is chosen from iridescent particles, fluorescent particles, phosphorescent particles, colored particles, planchettes.
11) Papier de sécurité selon l'une des revendications 8 à 10, caractérisé en ce que l'élément d'authentification réagit à certaines stimulations en donnant un signal spécifique détectable à l'aide d'un appareil adapté. 12) Papier de sécurité selon la revendication précédente 11, caractérisé en ce que l'élément d'authentification est choisi parmi les substances réagissant à des champs électromagnétiques, en particulier de type micro-onde ou infra-rouge ou ultra- violet. 13) Papier de sécurité selon l'une des revendications précédentes 8 à 12, caractérisé en ce que l'élément apportant la résistance au double-pli est aussi un élément d'authentification. 14) Procédé de fabrication d'un papier de sécurité, ayant une résistance au double-pli élevée telle que définie dans la norme NF ISO 5626, selon l'une des revendications précédentes, comprenant les étapes suivantes : on dépose une première composition de pâte sur une première toile d'égouttage, - on égoutte la première composition de pâte de manière à former un premier matelas fibreux, on dépose une seconde composition de pâte sur une seconde toile d'égouttage, on égoutte la seconde composition de pâte de manière à former un second matelas fibreux, on projette sur au moins l'un desdits matelas fibreux une composition liquide contenant un élément soluble ou en émulsion ou sous forme de particules conférant ladite résistance au double-pli élevée, on assemble ledit premier matelas fibreux audit second matelas fibreux pour former un matelas fibreux unitaire.11) Security paper according to one of claims 8 to 10, characterized in that the authentication element reacts to certain stimuli by giving a specific signal detectable using a suitable device. 12) Security paper according to the preceding claim 11, characterized in that the authentication element is chosen from substances reacting to electromagnetic fields, in particular of the microwave or infrared or ultra-violet type. 13) Security paper according to one of the preceding claims 8 to 12, characterized in that the element providing resistance to the double ply is also an authentication element. 14) Method for manufacturing a security paper, having a high double-fold resistance as defined in standard NF ISO 5626, according to one of the preceding claims, comprising the following steps: depositing a first pulp composition on a first drip cloth, - the first dough composition is drained so as to form a first fibrous mat, a second dough composition is deposited on a second drip cloth, the second dough composition is drained so as to forming a second fibrous mattress, a liquid composition containing a soluble or emulsion element or in the form of particles conferring said high double-ply resistance is projected onto at least one of said fibrous mattress, said first fibrous mattress is assembled to said second mattress fibrous to form a unitary fibrous mattress.
15) Procédé selon la revendication précédente 14, caractérisé en ce que ladite composition est projetée par pulvérisation. 16) Procédé selon l'une des revendications 14 à 15, caractérisé en ce que l'on forme au moins un filigrane dans le premier et/ou le second matelas fibreux.15) Method according to the preceding claim 14, characterized in that said composition is sprayed. 16) Method according to one of claims 14 to 15, characterized in that at least one watermark is formed in the first and / or the second fibrous mat.
17) Procédé selon l'une des revendications 14 à 16, caractérisé en ce que l'on projette sur ledit premier et/ou ledit second matelas fibreux une composition liquide contenant au moins un élément d'authentification. 18) Procédé selon l'une des revendications 14 à 17, caractérisé en ce que l'égouttage de la première composition de pâte ou de la seconde composition de pâte est effectué à l'aide d'une toile Fourdrinier, d'une double toile ou d'un cylindre de forme ronde.17) Method according to one of claims 14 to 16, characterized in that one projects on said first and / or said second fibrous mat a liquid composition containing at least one authentication element. 18) Method according to one of claims 14 to 17, characterized in that the draining of the first paste composition or the second paste composition is carried out using a Fourdrinier cloth, a double cloth or a round cylinder.
19) Procédé selon l'une des revendications 14 à 18, caractérisé en ce qu'il comporte des étapes supplémentaires de pressage et de séchage du matelas fibreux unitaire. 19) Method according to one of claims 14 to 18, characterized in that it comprises additional steps of pressing and drying of the unitary fibrous mat.
EP04817614A 2003-12-30 2004-12-29 Security paper highly resistant to double folding and method for making same Withdrawn EP1702110A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0315575A FR2864557B1 (en) 2003-12-30 2003-12-30 SAFETY PAPER HAVING HIGH DOUBLE-PLI RESISTANCE AND METHOD OF MANUFACTURE
PCT/FR2004/003403 WO2005073464A1 (en) 2003-12-30 2004-12-29 Security paper highly resistant to double folding and method for making same

Publications (1)

Publication Number Publication Date
EP1702110A1 true EP1702110A1 (en) 2006-09-20

Family

ID=34639699

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Application Number Title Priority Date Filing Date
EP04817614A Withdrawn EP1702110A1 (en) 2003-12-30 2004-12-29 Security paper highly resistant to double folding and method for making same

Country Status (6)

Country Link
US (1) US7754314B2 (en)
EP (1) EP1702110A1 (en)
BR (1) BRPI0418257B1 (en)
CA (1) CA2550574C (en)
FR (1) FR2864557B1 (en)
WO (1) WO2005073464A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2929965B1 (en) * 2008-04-11 2010-05-21 Arjowiggins Licensing Sas SECURITY SHEET HAVING A RIBBON HAVING A REDUCED OPERATING AREA.
US8705805B2 (en) 2011-01-10 2014-04-22 Peter Alexander Forrest Secure portable token and systems and methods for identification and authentication of the same
FR2984926B1 (en) * 2011-12-21 2014-02-21 Arjowiggins Security COLOR RESISTANT PAPER SHEET
GB2531584B (en) * 2014-10-23 2019-07-10 Portals De La Rue Ltd Improvements in security papers and documents
WO2017068440A1 (en) * 2015-10-24 2017-04-27 Malpani Manoj High tear resistant paper comprising means for determinining authenticity

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Publication number Priority date Publication date Assignee Title
US3256138A (en) * 1965-02-08 1966-06-14 John A Manning Paper Co Inc Application of resin particles to a wet fibrous ply in forming a multi-ply water-laid web
US3880706A (en) * 1970-11-16 1975-04-29 Harold Malcolm Gordon Williams Security paper containing fused thermoplastic material distributed in a regular pattern
US5449200A (en) * 1993-06-08 1995-09-12 Domtar, Inc. Security paper with color mark
US5716695A (en) * 1996-02-15 1998-02-10 Mobil Oil Corp Cross-laminated multilayer film structures for use in the production of banknotes or the like
SE513878C2 (en) * 1998-06-17 2000-11-20 Scand Stick Ab Security paper in the form of laminates with different colored layers
ATE394243T1 (en) * 2003-02-27 2008-05-15 Landqart MULTI-LAYER LAMINATE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005073464A1 *

Also Published As

Publication number Publication date
WO2005073464A1 (en) 2005-08-11
FR2864557A1 (en) 2005-07-01
US7754314B2 (en) 2010-07-13
FR2864557B1 (en) 2006-10-27
BRPI0418257A (en) 2007-04-17
BRPI0418257B1 (en) 2015-12-08
US20070164556A1 (en) 2007-07-19
CA2550574C (en) 2011-11-29
CA2550574A1 (en) 2005-08-11

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