EP0687324B1 - Security paper comprising localised areas with reduced thickness and opacity, and method for making same - Google Patents

Security paper comprising localised areas with reduced thickness and opacity, and method for making same Download PDF

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Publication number
EP0687324B1
EP0687324B1 EP19940908388 EP94908388A EP0687324B1 EP 0687324 B1 EP0687324 B1 EP 0687324B1 EP 19940908388 EP19940908388 EP 19940908388 EP 94908388 A EP94908388 A EP 94908388A EP 0687324 B1 EP0687324 B1 EP 0687324B1
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European Patent Office
Prior art keywords
paper
sheet
thickness
region
ply
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Expired - Lifetime
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EP19940908388
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German (de)
French (fr)
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EP0687324B2 (en
EP0687324A1 (en
Inventor
Pierre Doublet
Yves Douesneau
Jean-Paul Menez
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ArjoWiggins Security Sas
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Arjo Wiggins SA
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Family has litigation
Priority to FR9302373 priority Critical
Priority to FR9302373 priority
Priority to FR9311485 priority
Priority to FR9311485 priority
Priority to PCT/FR1994/000225 priority patent/WO1994020679A1/en
Application filed by Arjo Wiggins SA filed Critical Arjo Wiggins SA
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/06Vegetable or imitation parchment; Glassine paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/44Watermarking devices
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006Making patterned paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/06Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
    • D21F11/08Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type paper or board consisting of two or more layers
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/14Non-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
    • D21H21/40Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper

Abstract

A method for making a paper sheet comprising at least one region which is thinner than the rest of the sheet. According to the method, a first paper layer (3) is formed on a wire in a first wet end of a paper-making machine, a second paper layer (5) is formed on a wire in a second wet end of the paper-making machine, one of the two paper layers has a number of localised thinner regions (8) so that the thickness (e2) of said paper layers in said regions is up to 50 % less than the thickness (et) of the rest of the sheet, and the two layers are joined together and dried. The resulting paper may be used in banknotes or cheques.

Description

L'invention concerne une feuille de papier de sécurité comportant des zones localisées d'épaisseur et d'opacité réduites et plus particulièrement un papier pour billets de banque ou un papier de sécurité comportant des zones importantes d'épaisseur et d'opacité réduites, à des endroits déterminés, ces zones étant des filigranes. The invention relates to a security paper sheet having localized areas of reduced thickness and opacity and more particularly a paper for bank notes or security paper comprising large areas of reduced thickness and opacity, to specific locations, these areas being watermarks.

L'invention concerne de préférence une feuille de papier comportant au moins une zone ayant une opacité moyenne uniforme inférieure d'au moins 40 % par rapport à l'opacité du reste de la feuille. The invention preferably relates to a paper sheet comprising at least one zone having a lower uniform average opacity of at least 40% relative to the opacity of the rest of the sheet.

Dans la présente description, "papier" signifie toute feuille obtenue par voie humide à l'aide d'une suspension de fibres de cellulose naturelle et/ou de fibres synthétiques pouvant contenir diverses charges et divers additifs utilisés couramment en papeterie. In the present description, "paper" means any sheet obtained by wet route using a suspension of natural cellulose fibers and / or synthetic fibers may contain various fillers and additives commonly used in papermaking.

On connaít déjà dans la technique antérieure des papiers qui sont transparentisés. already known in the prior art papers that are transparentized. Ces papiers sont par exemple rendus transparents par des compositions chimiques (voir notamment le brevet français n° 82 05124, déposé le 15 mars 1982 par ARJOMARI-PRIOUX). These papers are rendered transparent for example by chemical compositions (see in particular the French patent No. 82 05124, filed on 15 March 1982 by Arjomari-PRIOUX). Ces papiers sont rendus transparents sur toute leur surface et sont destinés à des applications pour le dessin industriel, la reproduction de plans, etc. These papers are rendered transparent over their entire surface and are intended for applications for industrial design, breeding plans, etc.

On connaít aussi des procédés chimiques de transparentisation partielle, c'est-à-dire à des endroits déterminés. Also known chemical processes of partial transparentization, that is to say at determined locations. Ces procédés utilisent des compositions à base de graisse ou d'huile minérale ou végétale qui sont déposées par impression. These methods use compounds based on fat or mineral or vegetable oil which are deposited by printing. Cependant, il est difficile d'imprimer sur ces zones transparentisées à l'aide de techniques usuelles actuelles d'impression (offset, taille-douce, héliographie, etc.). However, it is difficult to print on these areas transparentisées using usual current printing techniques (offset, intaglio, rotogravure, etc.).

Par ailleurs, il est connu de réaliser des différences d'épaisseur et de densité dans le papier, notamment par la technique des filigranes utilisée pour sécuriser les papiers pour billets de banque, les documents d'identité ou documents officiels et de valeur. Furthermore, it is known to make differences in thickness and density in the paper, including the technical watermarks used to secure papers for banknotes, identity documents or official documents and value. Ces filigranes sont obtenus lors de la fabrication de la feuille dé papier par des formes rondes comportant des empreintes en creux et/ou en relief ou à l'aide de rouleaux filigraneurs comportant des dessins en creux et/ou en relief associés à une table plate (machine Fourdrinier). These watermarks are obtained during the manufacture of the paper sheet with round shapes having indentations and / or raised or using watermarking rolls with drawings recessed and / or raised associated with a Fourdrinier wire (Fourdrinier machine). On obtient alors une image qui, lorsqu'on regarde la feuille de papier en transmission, apparaít soit claire, si le rouleau filigraneur comporte un dessin en relief, soit sombre, si le rouleau filigraneur comporte un dessin en creux. An image is then obtained which, when viewed in the transfer paper, appears to be clear, if the watermark roll includes a raised pattern, or dark, if the watermark roll includes a hollow drawing. Les zones claires sont dues au fait que l'épaisseur de la feuille et la densité des fibres sont plus faibles que l'épaisseur de la feuille et la densité des fibres dans les zones où il n'y a pas eu empreinte par le rouleau filigraneur. The light areas are due to the fact that the thickness of the sheet and the density of the fibers are smaller than the thickness of the sheet and the fiber density in areas where there is no imprint the watermark roll . Au contraire, les zones foncées sont dues au fait que l'épaisseur de la feuille et la densité des fibres sont plus importantes. In contrast, the dark areas are due to the fact that the thickness of the sheet and the fiber density are more important.

De tels filigranes comportent des parties claires qui ont en général des superficies de quelques mm 2 et la variation d'opacité entre la partie claire du filigrane et le papier non filigrané est faible. Such watermarks include light parts which generally have areas of several mm 2 and the change in opacity between the light part of the watermark and non watermarked paper is low. Si l'on souhaite effectuer une impression sur les zones claires de ces filigranes, il est très difficile de faire correspondre les zones claires et l'impression et même avec un repérage très précis des filigranes, on parvient difficilement à obtenir une bonne correspondance. If one wishes to make an impression on the light areas of these watermarks, it is very difficult to match the light areas and printing and even with a very accurate tracking watermarks, one finds it difficult to get a good match.

On a décrit dans la demande de brevet européen n° 388 090, déposée le 9 mars 1990 par DE LA RUE COMPANY PLC. It was disclosed in European Patent Application No. 388,090, filed March 9, 1990 by STREET COMPANY PLC. un papier de sécurité comportant des zones d'opacité réduite, à des endroits déterminés et bien localisés, les zones permettant de voir par transmission, à l'oeil nu, des impressions portées sur la face opposée à la face selon laquelle on regarde le papier. a security paper comprising areas of reduced opacity, to specific and well localized areas, areas for viewing by transmission, to the naked eye, impressions carried on the opposite face to the face that looking at the paper . Les zones peuvent par exemple être réalisées sous forme de filigrane en utilisant des procédés par forme ronde ou par rouleaux filigraneurs. The zones can for example be made as a watermark using methods by round or dandy rolls.

Or, dans cette demande de brevet, on ne décrit pas comment on obtient industriellement ces zones. But in this application, it does not describe how we get these industrial areas.

Industriellement, il est relativement aisé de fabriquer du papier comportant des zones d'épaisseur réduite et donc claires, obtenues par la technique du filigrane, quand la superficie de ces zones est inférieure à 0,4 cm 2 . Industrially, it is relatively easy to manufacture paper with reduced thickness areas and thus clear, obtained by the technique of filigree, when the area of these areas is less than 0.4 cm 2. Par contre, si l'on souhaite obtenir des zones dont la superficie est supérieure à 0,4 cm 2 , par la technique du filigrane l'homme du métier rencontre des problèmes techniques. By cons, if one wishes to obtain zones with an area greater than 0.4 cm 2, by the technique of filigree in the art encounters technical problems.

Le premier problème est le suivant: Pour réaliser un filigrane, l'homme du métier sait que l'on peut embosser la toile d'une forme ronde à l'aide d'un poincon. The first problem is: To create a watermark, the skilled person knows that one can emboss the wire of a round shape with a punch. Par exemple, si on souhaite une zone circulaire claire, on embossera la toile avec un poinçon circulaire. For example, if you want a clear circular zone, embossera the canvas with a circular punch. Cependant, en utilisant un tel procédé, on n'obtient pas une zone claire d'opacité constante. However, using such a method, one does not obtain a clear zone of constant opacity. En effet, on s'est aperçu que les fibres ont tendance à se déposer en plus grande quantité au voisinage du centre de la partie embossée que sur les bords et donc le centre du filigrane apparaít beaucoup moins clair que les bords. Indeed, it was found that the fibers tend to settle in larger quantities in the vicinity of the center of the embossed part on the edges and therefore the center of the watermark appears much less clear than the edges. Si on utilise un rouleau filigraneur qui comporte des aspérités en relief, on obtient le même phénomène. When using a dandy roll comprises raised protrusions, the same phenomenon is obtained.

Un deuxième problème qui se pose est que lorsque l'on veut des zones d'épaisseur réduite et donc claires ayant une superficie de plus de 0,4 cm 2 , on n'obtient pas de zone claire. A second problem is that when we want the areas of reduced thickness and thus having clear an area of more than 0.4 cm 2, you do not get a clear area.

On connaít par ailleurs divers moyens pour éviter la falsification des chèques. We know also various ways to prevent check fraud. Ainsi, on peut ajouter dans ou sur le papier pour chèques des composés chimiques qui réagissent avec des acides, des bases ou des crayons effaceurs. Thus, one can add or paper checks for chemical compounds that react with acids, bases or pencils erasers. Cependant, on cherche toujours de nouveaux moyens contre la falsification. However, we're always looking for new ways against forgery.

On a décrit dans la demande de brevet européen déposée le 18 novembre 1992 par la demanderesse et publiée le 30 juin 1993 sous le numéro EP-A-549 384, un procédé de fabrication d'une feuille de papier comportant au moins une zone ayant une épaisseur réduite par rapport à l'épaisseur du reste de la feuille, et ayant une superficie d'au moins 0,4 cm 2 , en disposant sur une toile embossée ou non, éventuellement disposée sur une forme ronde, une dispersion aqueuse contenant au moins des fibres cellulosiques, en égouttant l'eau pour former la feuille, en présence ou non d'un rouleau filigraneur, en séchant. Have been described in the European patent application filed on 18 November 1992 by the applicant and published June 30, 1993 under EP-A-549 number 384, a method of manufacturing a sheet of paper having at least one area having a reduced thickness relative to the thickness of the rest of the sheet and having an area of at least 0.4 cm 2, by forming on a fabric embossed or unsaturated, optionally disposed on a round shape, an aqueous dispersion containing at least cellulose fibers, draining water to form the sheet, in the presence or absence of a dandy roll, drying. On utilise des pièces flexibles que l'on associe à la toile filigraneuse, au rouleau filigraneur ou à la forme ronde, de façon que l'égouttage de l'eau lors de la formation de la feuille dans les zones des pièces flexibles soit diminué par rapport à l'égouttage de l'eau dans les zones ne comportant pas de pièce flexible. Using flexible parts that are associated with the filigraneuse canvas, the dandy roll or round shape, so that the draining of water during the formation of the sheet in the areas of flexible parts is decreased by relative to the dewatering of the water in the areas having no flexible piece.

La feuille de papier obtenue selon ce procédé est telle que la zone ayant une épaisseur réduite a une épaisseur inférieure jusqu'à 40 % de l'épaisseur du reste de la feuille. The paper obtained according to this process is such that the area having a reduced thickness has a thickness of up to 40% of the thickness of the remainder of the sheet. La feuille peut aussi être telle que ladite zone a une opacité moyenne inférieurejusqu'à 40 % de l'opacité du reste de la feuille. The sheet may also be such that said area has an average opacity inférieurejusqu'à 40% of the opacity of the rest of the sheet.

Un tel procédé permet donc d'obtenir des zones d'opacité réduite. Such a method makes it possible to obtain areas of reduced opacity. Cependant, on cherche encore à réduire l'opacité des zones. However, it still seeks to reduce the opacity of areas.

De plus, le procédé nécessite une transformation de la machine à papier, à savoir que l'on associe à la toile filigraneuse, ou au rouleau filigraneur, ou à la forme ronde, des pièces flexibles. In addition, the method requires a transformation of the paper machine, that are associated with the filigraneuse canvas, or dandy roll, or round, flexible parts. Ces pièces doivent être fixées à des endroits déterminés et nécessitent donc une manipulation supplémentaire. These parts must be attached to specific locations and therefore require additional handling. De plus, la zone a une épaisseur inférieure de 30 % par rapport à l'épaisseur du reste de la feuille. In addition, the area has a thickness less than 30% relative to the thickness of the rest of the sheet.

On a décrit dans le document EP-A-0 229 645 un procédé de fabrication d'une feuille de sécurité comportant un fil de sécurité. Been described in EP-A-0229645 a method of manufacturing a security sheet having a security thread. Il consiste à former une première couche de papier et une seconde couche de papier, à introduire un élément de sécurité entre ces deux couches, à réunir ces deux couches. It consists in forming a first paper layer and a second paper layer, introducing a security element between these two layers, these two layers together. L'une des couches a des régions locales dont l'épaisseur est de 0 à 30 % de l'épaisseur totale de la feuille de papier. One of the layers has local regions whose thickness is from 0 to 30% of the total thickness of the paper sheet. Une telle feuille de sécurité permet d'obtenir une feuille comportant un fil de sécurité plus ou moins apparent en surface. Such a security sheet allows to obtain a sheet having a more or less apparent surface security thread.

On connait par ailleurs des billets de banque qui sont constitués de feuilles de matière synthétique transparente sur lesquelles on effectue une impression recto-verso, l'impression étant telle qu'elle laisse une zone complètement transparente. banknotes also are known which are made of transparent plastic sheets on which is carried a double-sided printing, printing is such that it leaves a completely transparent area. Sur cette zone transparente on reporte un hologramme. On this transparent area is plotted a hologram. De tels billets en plastique ont cependant quelques inconvénients. Such plastic notes, however, have some drawbacks. Ils sont peu résistants à la manipulation et à la circulation car l'impression peut être fragile sur le plastique. They are very resistant to handling and circulation since the impression can be fragile on the plastic. C'est la raison pour laquelle on préfère des billets en papier, mais on souhaite en même temps réaliser une zone la plus transparente possible. This is why we prefer paper tickets, but we wish at the same time achieve the most transparent area. Or, selon le procédé décrit dans le document EP-A-549 384, la zone obtenue est certes d'épaisseur réduite et d'opacité réduite, mais on veut une zone d'opacité encore plus faible. However, according to the method described in EP-A-549 384, the area obtained is certainly reduced thickness and of reduced opacity, but we want an even lower opacity zone.

Par conséquent, un autre but de l'invention est de réaliser dans le papier une zone pratiquement transparente ou translucide, sans percer le papier dans cette zone. Therefore, another object of the invention is to achieve in the paper an almost transparent or translucent area without piercing the paper in this area.

Un autre but est de réaliser dans le papier une zone pratiquement transparente ou translucide, cette zone pouvant être imprimée et/ou pouvant recevoir un hologramme ou toute autre marque distinctive ou de sécurité. Another object is to achieve in the paper a substantially transparent or translucent area, this area can be printed and / or can receive a hologram or any other distinctive mark or security.

Cette zone doit donc être suffisamment résistante pour supporter le report d'une marque de sécurité. This area should be strong enough to support the transfer of a security mark.

Un but de l'invention est donc de fournir des zones d'épaisseur réduite par rapport au reste de la feuille sans avoir besoin d'utiliser des pièces flexibles associées. An object of the invention to provide areas of reduced thickness compared to the rest of the paper without having to use flexible parts associated.

Un autre but de l'invention est de fournir des zones ayant une épaisseur inférieure beaucoup plus réduite que 40% par rapport du reste de la feuille. Another object of the invention is to provide areas having a thickness much smaller than 40% of the rest of the sheet.

A cet effet, l'invention concerne une feuille de papier comportant au moins une zone d'épaisseur et d'opacité réduites ayant une superficie de plus de 0,4 cm 2 , caractérisée en ce que la dite feuille est une feuille comprenant une structure bi-jet constituée d'une première couche de papier comportant au moins une zone dont l'épaisseur est nulle et d'une seconde couche de papier d'épaisseur sensiblement constante, les deux couches étant directement réunies. To this end, the invention relates to a paper sheet comprising at least one thickness area and reduced opacity having an area of more than 0.4 cm 2, characterized in that said sheet is a sheet comprising a structure bi-jet consisting of a first paper layer having at least one region whose thickness is zero and of a second paper layer of substantially constant thickness, the two layers being joined directly.

La feuille selon l'invention peut comporter dans une partie de la zone d'opacité réduite un hologramme, un couchage iridescent, une impression à l'aide d'encres classiques ou d'encres contenant des pigments colorés, pigments fluorescents, luminescents, composés photochromes, piezooptiques, piezochromes. The sheet according to the invention may comprise in a part of the zone of reduced opacity a hologram, an iridescent coating, printing using conventional inks or inks containing color pigments, fluorescent pigments, luminescent compounds photochromic piezooptiques, piezochromic.

Le second jet peut être partiellement ou totalement transparentisé. The second ply may be partially or completely transparentized. Dans le cas où le second jet est totalement transparentisé, ce jet peut être obtenu selon la technique du papier calque, à savoir à partir d'une suspension de fibres de cellulose très raffinées, pour obtenir la transparence. In the event that the second ply is completely transparentized, the jet can be obtained according to the technique of tracing paper, namely from a suspension of highly refined cellulose fiber, to obtain transparency. Dans le cas où le second jet est partiellement transparentisé, il est transparentisé par voie chimique dans une zone qui vient en correspondance avec la zone d'épaisseur nulle du premier jet. In the event that the second ply is partially transparentized, it is chemically transparentized in an area which comes into correspondence with the zone of zero thickness of the first ply.

L'invention concerne en outre un procédé de fabrication d'une feuille de papier comportant au moins une région ayant une épaisseur et opacité réduites par rapport au reste de la feuille, dans lequel : The invention further relates to a method for manufacturing a sheet of paper having at least one region having a thickness and reduced opacity compared to the rest of the sheet, wherein:

  • on forme une première couche de papier sur une toile d'une première partie humide d'une machine à papier, a first layer of paper is formed on a wire of a first wet end of a paper machine,
  • on forme une seconde couche de papier sur une toile d'une seconde partie humide d'une machine à papier, a second layer of paper is formed on a wire of a second wet end of a paper machine,
  • la première couche de papier présentant au moins une région locale d'épaisseur nulle the first layer of paper having at least one local region of zero thickness
  • on réunit directement les deux couches et on les sèche, the two layers and dried are joined directly,
ladite région d'épaisseur plus faible de la feuille ayant une opacité moyenne uniforme et une superficie d'au moins 0,4 cm 2 . said reduced thickness region of the sheet having a uniform average opacity and an area of at least 0.4 cm 2.

Bien que les couches de papier soient réalisées sur des toiles à papier séparées, on obtient une feuille de papier qu'il n'est plus possible de séparer en raison de l'accouplement rapide de ces couches et de leur séchage en commun. Although the paper layers are carried on separate paper webs, there is obtained a sheet of paper it is no longer possible to separate due to the quick coupling of these layers and their common drying. La feuille de papier ne se différencie pas d'une feuille de papier réalisée sur une toile unique. The sheet of paper is no different from a sheet of paper carried on a single canvas.

Le procédé est tel que les régions d'épaisseur nulle sont réalisées par des régions gaufrées en relief sur la toile mécanique, d'où il résulte que le dépôt des fibres dans ces régions est totalement interdit. The method is such that the regions of zero thickness are produced by embossed regions in relief on the mechanical weave, whereby the deposition of fibers in these regions is completely prohibited.

De préférence au moins une des couches du papier est réalisée par une machine à forme ronde. Preferably at least one of the paper layers is made by a cylinder machine.

Les régions d'épaisseur plus mince de la feuille de papier sont constituées sous forme d'un motif géométrique simple, en particulier sous forme de régions plates approximativement rectangulaires, rondes ou elliptiques ou toute autre forme. The thinner thickness of regions of the sheet of paper are in the form of a simple geometrical pattern, particularly in the form of approximately rectangular flat regions, round or elliptical or any other shape.

La description suivante, en regard des dessins annexés à titre d'exemples non limitatifs permettra de comprendre comment l'invention peut être mise en pratique. The following description, the accompanying drawings by way of non-limiting examples will show how the invention can be implemented.

  • La figure 1 montre un dispositif pouvant servir à la fabrication de papier de sécurité selon l'invention. Figure 1 shows a device that can be used in the manufacture of security paper of the invention.
  • Les figures 2, 3 et 5 montrent en coupe divers papiers qui ne sont pas couverts par les revendications. Figures 2, 3 and 5 show in section various papers that are not covered by the claims.
  • Les figures 4 et 6 montrent en coupe des papiers selon l'invention. Figures 4 and 6 show sectional papers according to the invention.
  • La figure 7 montre un papier pour chèques obtenu selon l'invention. 7 shows a check paper obtained according to the invention.

La figure 1 montre un dispositif pouvant être utilisé pour réaliser un papier selon l'invention. Figure 1 shows a device that can be used to produce a paper of the invention. Le dispositif correspond essentiellement aux machines à papier habituelles du commerce, qui comprennent au moins deux parties humides séparées. The device essentially corresponds to the usual paper machines of commerce, which comprises at least two separate wet ends. Le mode de réalisation préféré montré ici est constitué par une combinaison de deux parties humides à forme ronde 1 et 2 d'une machine à papier dite à double forme ronde. The preferred embodiment shown here consists of a combination of two wet ends to round 1 and 2 a so-called paper machine dual round shape. Dans la partie humide 1 on réalise une première bande de papier 3, qui est dirigée vers la seconde partie humide 2 en étant suspendue au-dessous du feutre preneur 4. Dans la seconde installation 2 on réalise une seconde bande de papier 5. Les deux bandes de papier sont réunies au niveau du rouleau 6 et sont ensuite séchées. In the wet end 1 is performed a first paper web 3, which is directed towards the second wet end 2 being suspended below the felt holder 4. In the second device 2 is carried out a second paper web 5. The two paper webs are combined at the roller 6 and are then dried.

On utilise de préférence pour la réalisation des deux couches de papier deux installations à forme ronde. is preferably used for the realization of two layers of paper two facilities round shape. Mais il est également possible de réaliser les deux couches de papier dans des installations à table plate, ou d'utiliser pour la réalisation des deux couches de papier une combinaison d'une installation à table plate et d'une installation à forme ronde. But it is also possible to make the two layers of paper in installations in flat table, or use for the realization of two layers of paper a combination of a flat installation table and a round installation.

Sur les figures 2 et 3, on a représenté un papier qui'n'est pas couvert par les revendications. Figures 2 and 3, a paper is shown qui'n'est not covered by the claims. Cette feuille 7 est formée d'une première bande 3 et d'une seconde bande 5. La bande 5 comporte des filigranes clairs 8 obtenus par exemple par un embossage en relief de la toile de la forme ronde 5. Ces filigranes clairs ont une profondeur e 1 . This sheet 7 is formed of a first strip 3 and a second strip 5. The strip 5 comprises clear watermarks 8 obtained for example by a raised embossing the web of round 5. These clear watermarks have a depth e 1. L'épaisseur totale e t de la feuille 7 est la somme des épaisseurs e 3 de la bande 3 et e 6 de la bande 5. L'épaisseur e 2 de la feuille 7 en regard des filigranes 8 est inférieure à l'épaisseur totale e t . The total thickness e t of the sheet 7 is the sum of the thicknesses e 3 of the strip 3 and 6 e of the strip 5. The thickness e 2 of the sheet 7 facing the watermarks 8 is less than the total thickness e t. Sur la figure 2, on ae 1 = 1/3 e t = 33,3 % e t . In Figure 2, ae 1 = 1/3 = 33.3% e t e t.

Sur la figure 3, on ae 1 = 1/2 e t = 50 % e t . In Figure 3, we have e e t 1 = 1/2 = 50% an d.

Sur la figure 4, la région 8 est telle que la bande 5 comporte un trou. In Figure 4, the region 8 is such that the strip 5 comprises a hole.

La réduction d'épaisseur est donc de 33 % environ dans le premier cas et de 50 % dans le second cas. Therefore the thickness reduction is about 33% in the first case and 50% in the second case. La feuille de la figure 3 a donc une opacité réduite bien inférieure à l'opacité de la feuille de la figure 2, dans la région 8 et ce pour une épaisseur e t totale sensiblement égale. The sheet of Figure 3 thus has a reduced opacity much less than the opacity of the sheet of Figure 2 in the region 8 and for a total thickness t e substantially equal.

En réglant les épaisseur e 3 et e 5 des bandes 3 et 5, ainsi que la profondeur e 1 des filigranes 8, on peut obtenir les opacités et les épaisseurs réduites que l'on désire. By adjusting the thickness e 3 and e 5 of the strips 3 and 5, and the depth e1 watermarks 8, opacities and reduced thicknesses as desired can be obtained.

La feuille représentée sur la figure 5 est réalisée selon la technique du monojet. The sheet shown in Figure 5 is performed according to the single-jet technique. Cette feuille est obtenue par le procédé décrit dans la demande EP-A-549 384 et n'est pas couverte par les revendications du present brevet européen. This sheet is obtained by the method described in EP-A-549 384 and is not covered by the claims of this European patent.

La feuille 11 comporte des zones 12, 12 a , 12 b , d'épaisseur e 1 et des zones 13, 13 a , d'épaisseur e 2 non nulle. The sheet 11 has zones 12, 12 a, 12 b, of thickness e 1 and zones 13, 13 has a thickness e 2 non-zero. Les zones 13, 13 a ont une densité de fibres bien inférieure à la densité des zones 12, 12 a , 12 b . Zones 13, 13a have a density of fibers much lower than the density of zones 12, 12 a, 12 b. Chaque zone 13, 13 a subit une transparentisation supplémentaire. Each zone 13, 13 has undergone an additional transparentization. Cette transparentisation est réalisée par voie chimique selon ce mode de réalisation. This transparentization is carried out chemically according to this embodiment. De préférence, la transparentisation est réalisée à l'aide d'une composition de transparentisation décrite dans le brevet européen de la demanderesse EP-91 341. La transparentisation supplémentaire est effectuée après séchage de la feuille, en bout de machine. Preferably, the transparentization is performed using a transparentization composition described in the European patent EP-91 341. The applicant additional transparentization is performed after drying the sheet, in the end machine.

Cette composition peut par exemple être constituée de : This composition may for example be made of:

  • 12 % d'une résine de condensation cétone - aldéhyde modifiée 12% of a ketone condensation resin - modified aldehyde
  • 23 % d'une résine hexaméthoxyméthylmélaminée 23% of a resin hexaméthoxyméthylmélaminée
  • 4 % d'alcool éthylique 4% ethyl alcohol
  • 17 % d'alcool butylique 17% butyl alcohol
  • 28 % de dibutylphtalate 28% of dibutyl phthalate
  • 16 % de produits isopar affiniqués. 16% of Isopar affiniqués products.

On applique cette composition par exemple par impression à l'aide d'un cylindre d'impression gravé, les gravures du cylindre correspondant aux zones 13, 13 a à transparentiser. This composition is applied for example by printing with a gravure printing cylinder, engraving of the cylinder corresponding to the zones 13, 13 has to transparentiser.

La figure 6 représente en coupe une feuille 14 obtenue selon la technique du "bijet" représentée sur la figure 1. Figure 6 shows in section a sheet 14 obtained according to the technique of "two-ply" shown in Figure 1.

La feuille 14 représentée sur la figure 6 est formée d'une première bande 16 et d'une seconde bande 17. La bande 17 est telle qu'elle présente des zones 18 d'épaisseur nulle. The sheet 14 shown in Figure 6 is formed of a first strip 16 and a second band 17. The band 17 is such that it has regions of zero thickness 18. La bande 16 peut être transparentisée ou non dans les zones situées en regard des zones 18. The strip 16 may be transparentized or not in the areas opposite the areas 18.

On réalise les zones d'épaisseur nulle en embossant la toile de la forme ronde 5, de façon suffisante pour qu'au niveau des embossages, il n'y ait aucun dépôt de fibres de cellulose. the thick zones is carried zero embossant the web of round 5, sufficiently to at the level of embossings, there is no deposit of cellulose fibers.

Si on réalise les deux couches de papier dans des installations à table plate, la bande 16 peut être un papier calque obtenu par un raffinage poussé des fibres de cellulose. If one carries out the two paper layers in installations Fourdrinier, the band 16 may be a tracing paper obtained by refining pushed cellulose fibers.

On peut déposer des motifs imprimés 15 en regard des zones 18. On peut aussi déposer des couches de pigments fluorescents, des couches ou impressions de pigments iridescents, des impressions métalliques, des hologrammes. Can be deposited printed patterns 15 opposite zones 18 may also be deposited layers of fluorescent pigments, iridescent pigments of layers or print, metal printing, holograms. On aura alors une feuille de papier comportant une zone transparente en lumière transmise, cette zone étant de surface importante. then there will be a sheet of paper having a transparent region in transmitted light, this zone being of large area. Si on dépose une couche, par exemple iridescente sur la zone transparente, cette couche ne recouvrant que partiellement la zone transparente, on aura un effet visuel supplémentaire. If a layer, for example iridescent on the transparent area, this layer covering only partially the transparent area, there will be an additional visual effect. De plus, une telle feuille sera très difficile à reproduire par photocopieur couleur car la zone iridescente ne sera pas reproduite par copie et la zone transparente sera opaque après copie. Moreover, such a sheet will be very difficult to reproduce color copier for the iridescent area will not be reproduced by copying and transparent area will be opaque after copying.

Sur la figure 7 on a représenté un papier de sécurité, de préférence un papier pour chèques, obtenu selon le procédé selon l'invention. In Figure 7 there is shown a security paper, preferably a paper checks, obtained according to the method of the invention. Ce papier de sécurité 19 comporte au moins une zone 20 dont l'épaisseur est inférieure à l'épaisseur du reste de la feuille. The security paper 19 includes at least one zone 20 whose thickness is less than the thickness of the remainder of the sheet. Ainsi, si on écrit sur la zone 20, le montant du chèque, au cas où un contrefacteur tenterait de gratter cette zone 20, il transpercera le papier de sécurité. So if you write on the area 20, the amount of the check, if a counterfeiter would try to scratching that area 20, it will pierce the security paper. De préférence, la zone 20 a une épaisseur inférieure de 40 % à l'épaisseur du reste de la feuille. Preferably, the zone 20 has a thickness less than 40% the thickness of the remainder of the sheet.

Claims (16)

  1. Sheet of security paper comprising at least one region (8, 20) of reduced thickness and opacity having an area of more than 0.4 cm2, characterized in that the said sheet is a sheet comprising a two-ply structure consisting of a first ply (17) of paper comprising at least one region (18) whose thickness is zero and of a second ply (16) of paper of approximately constant thickness, the two plies being directly joined together.
  2. Sheet of security paper according to Claim 1, characterized in that the thickness of the sheet in the regions of reduced thickness and opacity is up to 80% with respect to the thickness of the rest of the sheet.
  3. Sheet of security paper comprising at least one region (8, 20) of reduced opacity according to Claim 1 or 2, characterized in that the said region has a reduced opacity because of the reduction in its thickness with respect to the thickness of the rest of the sheet and because the said second ply (16) has undergone an additional transparentization step.
  4. Sheet according to Claim 1 or 3, characterized in that, in the region of reduced thickness and opacity, the sheet has a thickness at least 40% less than the thickness of the rest of the sheet.
  5. Sheet according to any one of Claims 1 to 4, characterized in that it includes, in part of the region of reduced opacity, a security element (15), such as a hologram, an iridescent coating, or printing using conventional inks or inks containing colour pigments, fluorescent or luminescent pigments or photochromic, piezooptic or piezochromic compounds.
  6. Sheet according to one of Claims 3 to 5, characterized in that the said second ply (16) is completely transparentized and obtained using the tracing-paper technique, starting from a suspension of highly refined cellulose fibres.
  7. Sheet according to one of Claims 1 to 6, characterized in that the said second ply (16) is partially transparentized using a chemical technique in a region which will be in correspondence with the region (18) of zero thickness of the said first ply (17).
  8. Process for manufacturing a sheet of paper comprising at least one region (8,20) having a reduced thickness and opacity with respect to the rest of the sheet, in which:
    a first ply (3) of paper is formed on a wire of a first wet end of a papermaking machine,
    a second ply (5) of paper is formed on a wire of a second wet end of a papermaking machine,
    the first ply of paper having at least one local region (18) of zero thickness,
    the two plies are joined together directly and dried,
    the said region (8, 20) of smaller thickness of the sheet having a uniform average opacity and an area of at least 0.4 cm2.
  9. Process according to Claim 8, characterized in that the said second ply (16) is completely transparentized and obtained using the tracing-paper technique, starting from a suspension of highly refined cellulose fibres.
  10. Process according to Claim 8, characterized in that the said second ply (16) is partially transparentized by a chemical technique in a region which will come into correspondence with the region (18) of zero thickness of the said first ply.
  11. Process according to one of Claims 8 to 10, characterized in that the thickness of the two plies of paper in the said local regions (8, 20) of smaller thickness is up to 80% with respect to the thickness of the rest of the sheet.
  12. Process according to either of Claims 8 and 11, characterized in that the process is such that the regions (18) of zero thickness are produced by embossed regions in relief on a metal watermarking wire, from which it follows that the deposition of fibres in these regions is completely prevented.
  13. Process according to one of Claims 8 to 12, characterized in that at least one of the two plies of paper is preferably produced by a cylinder-mould paper machine.
  14. Process according to one of Claims 8 to 13, characterized in that the regions (8, 20) of thinner thickness of the sheet of paper are in the form of a simple geometrical pattern, particularly in the form of approximately rectangular, round or elliptical flat regions.
  15. Application of a sheet according to one of Claims 1 to 7 as paper for bank-notes.
  16. Application of a sheet according to one of Claims 1 to 7 as security paper.
EP19940908388 1993-03-02 1994-03-01 Security paper comprising localised areas with reduced thickness and opacity, and method for making same Expired - Lifetime EP0687324B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR9302373 1993-03-02
FR9302373 1993-03-02
FR9311485 1993-09-28
FR9311485 1993-09-28
PCT/FR1994/000225 WO1994020679A1 (en) 1993-03-02 1994-03-01 Security paper comprising localised areas with reduced thickness and opacity, and method for making same

Publications (3)

Publication Number Publication Date
EP0687324A1 EP0687324A1 (en) 1995-12-20
EP0687324B1 true EP0687324B1 (en) 2000-01-19
EP0687324B2 EP0687324B2 (en) 2005-12-07

Family

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Application Number Title Priority Date Filing Date
EP19940908388 Expired - Lifetime EP0687324B2 (en) 1993-03-02 1994-03-01 Security paper comprising localised areas with reduced thickness and opacity, and method for making same

Country Status (5)

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US (1) US6402888B1 (en)
EP (1) EP0687324B2 (en)
DE (2) DE69422705D1 (en)
ES (1) ES2142937T5 (en)
WO (1) WO1994020679A1 (en)

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FR2804447B1 (en) * 2000-02-01 2002-04-05 Arjo Wiggins Sa Paper with a watermark has multitone effect and canvas to make this paper
SE516625C2 (en) * 2000-06-20 2002-02-05 Holmen Ab Security paper / board and process for production thereof
FR2816642B1 (en) * 2000-11-10 2003-07-18 Banque De France Method of manufacturing a security document
US6368455B1 (en) 2001-05-31 2002-04-09 Appleton Papers Inc. Method for making security paper
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FR2839917B1 (en) * 2002-05-22 2004-10-08 Arjo Wiggins Shaped article from at least one ply of fibrous material having at least one zone of zero thickness and method of manufacturing said article
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ITVR20040104A1 (en) * 2004-06-16 2004-09-16 Cartiere Fedrigoni & C Spa Apparatus for the production of security paper and method
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Also Published As

Publication number Publication date
US6402888B1 (en) 2002-06-11
DE69422705D1 (en) 2000-02-24
WO1994020679A1 (en) 1994-09-15
ES2142937T3 (en) 2000-05-01
DE69422705T3 (en) 2006-08-17
DE69422705T2 (en) 2000-10-05
EP0687324B2 (en) 2005-12-07
ES2142937T5 (en) 2006-07-16
EP0687324A1 (en) 1995-12-20

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