EP0687324B2 - 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
EP0687324B2
EP0687324B2 EP94908388A EP94908388A EP0687324B2 EP 0687324 B2 EP0687324 B2 EP 0687324B2 EP 94908388 A EP94908388 A EP 94908388A EP 94908388 A EP94908388 A EP 94908388A EP 0687324 B2 EP0687324 B2 EP 0687324B2
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Prior art keywords
sheet
thickness
paper
opacity
region
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EP94908388A
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German (de)
French (fr)
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EP0687324A1 (en
EP0687324B1 (en
Inventor
Pierre Doublet
Yves Douesneau
Jean-Paul Menez
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ArjoWiggins Security SAS
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ArjoWiggins Security SAS
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    • 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
    • D21H27/06—Vegetable or imitation parchment; Glassine paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/44—Watermarking devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/06—Processes 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
    • D21F11/08—Processes 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
    • 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

Definitions

  • the invention relates to a sheet of paper security with localized areas of thickness and reduced opacity and more particularly a paper for banknotes or a security paper comprising important areas of thickness and opacity reduced, at specific locations, these areas being watermarks.
  • the invention relates preferably to a sheet paper having at least one area having a uniform average opacity of at least 40% compared to the opacity of the rest of the sheet.
  • paper means any leaf obtained by wet process using a suspension of natural cellulose fibers and / or fibers synthetic materials that may contain various various additives commonly used in stationery.
  • the light areas are due to the fact that the thickness of the sheet and the density of the fibers are lower than the thickness of the leaf and the density of fibers in areas where there was no impression by the filigree roller.
  • the dark areas are due to the fact that the thickness of the leaf and the density of fibers are more important.
  • Such watermarks have clear parts which generally have areas of a few mm 2 and the variation in opacity between the clear part of the watermark and the non-watermarked paper is small. If you want to print on the light areas of these watermarks, it is very difficult to match the light areas and printing and even with a very precise identification of watermarks, it is difficult to get a good match.
  • Zones can for example be made under watermark shape using shape methods round or by watermarker rolls.
  • the first problem is: To achieve a watermark, the skilled person knows that one can emboss the canvas with a round shape using a punch. For example, if you want a circular area clear, emboss the canvas with a circular punch. However, using such a process, one does not get a clear area of constant opacity. Indeed, we glimpse that fibers tend to settle in more large quantity near the center of the part embossed only on the edges and thus the center of the watermark appears much less clear than the edges. Yes we use a filigraner roll which has asperities in relief, we obtain the same phenomenon.
  • a second problem that arises is that when one wants areas of reduced thickness and therefore clear with an area of more than 0.4 cm 2 , one does not obtain a clear area.
  • EP-A-549,384 describes a method of manufacturing a paper sheet comprising at least one zone having a reduced thickness relative to the thickness of the remainder of the sheet, and having an area of at least 0.4 cm 2 , by arranging on an embossed fabric or not, optionally arranged on a round shape, an aqueous dispersion containing at least cellulosic fibers, by draining the water to form the sheet, in the presence or absence of a filigree roller, by drying.
  • Flexible parts are used which are associated with the filigranous fabric, the filigree roller or the round shape, so that the water dripping during the formation of the sheet in the zones of the flexible parts is reduced by compared to the draining of the water in the zones having no flexible part.
  • the sheet of paper obtained by this process is such that the area having a reduced thickness has a thickness less than 40% of the thickness of the rest of the sheet.
  • the sheet can also be such that said zone has a lower average opacity of up to 40 % of the opacity of the rest of the sheet.
  • the process requires a transformation of the paper machine, namely that one associates with the filigranous fabric, or the filigree roller, or the round shape, flexible parts. These parts must be fixed at specific locations and require therefore an additional manipulation.
  • the area has a thickness of 30% less than the thickness of the rest of the leaf.
  • EP-A-0 229 645 a method of manufacturing a security sheet comprising a security thread. It consists of forming a first layer of paper and a second layer of paper, to introduce a security element between these two layers, to join these two layers. One of layers has local regions whose thickness is 0 to 30% of the total thickness of the paper sheet. A such security sheet makes it possible to obtain a sheet comprising a security thread more or less apparent on the surface.
  • banknotes which consist of sheets of synthetic material transparent on which an impression is made double-sided, the impression being such that it leaves a completely transparent area. On this transparent area we postpone a hologram.
  • Such notes in plastic however have some disadvantages. They are not very resistant to handling and circulation because the print can be fragile on the plastic. It is the reason why paper notes are preferred, but we want at the same time to realize a zone the more transparent possible.
  • the zone obtained is certainly of reduced thickness and reduced opacity, but wants an area of opacity even lower.
  • Another object of the invention is to make a virtually transparent area in the paper or translucent, without breaking the paper in this zoned.
  • Another goal is to realize in the paper a virtually transparent or translucent area, this area that can be printed and / or hologram or any other distinctive mark or security.
  • This zone must therefore be sufficiently resistant to support the postponement of a security mark.
  • An object of the invention is therefore to provide areas of reduced thickness compared to the rest of the sheet without needing to use flexible parts associated.
  • Another object of the invention is to provide areas having a much lower thickness reduced by 40% compared to the rest of the sheet.
  • the invention relates to a sheet of paper comprising at least one zone of reduced thickness and 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 layer of paper having at least one zone whose thickness is zero and a second layer of paper of substantially constant thickness, the two layers being directly joined together, the thickness of the sheet in said zone (8, 20) of reduced thickness and opacity being up to 80% with respect to the thickness of the remainder of the sheet.
  • the sheet according to the invention may comprise in part of the opacity area reduced a hologram, an iridescent bed, an impression using conventional inks or inks containing pigments colored, fluorescent pigments, luminescent, photochromic, piezo-optical, piezochromic compounds.
  • the second throw can be partially or totally transparentized.
  • this jet can be obtained according to the technique of tracing paper, namely from a suspension of highly refined cellulose fibers, for get transparency.
  • the second throw is partially transparent, it is transparent by chemical pathway in an area that comes in correspondence with the zone of zero thickness of the first jet.
  • the layers of paper are made on separate paper cloths, we obtain a sheet of paper that can no longer be separated into because of the rapid coupling of these layers and their drying in common.
  • the sheet of paper does not not differentiate from a sheet of paper made on a unique canvas.
  • the process is such that the thick regions none are made by embossed areas in relief on the mechanical canvas, from which it follows that the deposit of fibers in these areas is totally forbidden.
  • At least one of the layers of paper are made in the form of a pattern simple geometrical form, particularly in the form of approximately rectangular, round or elliptical or any other form.
  • Figure 1 shows a device that can be used to make a paper according to the invention.
  • the device basically corresponds to paper machines usual trade practices, which include at least two separate wet areas.
  • the embodiment preferred shown here is constituted by a combination of two round wet sections 1 and 2 of a so-called double-round paper machine.
  • a first strip of paper 3 which is directed towards the second wet part 2 being suspended beneath the takeup felt 4.
  • a second 5. In the second installation 2, a second 5.
  • the two strips of paper are gathered at the level of the roll 6 and are then dried.
  • FIGs 2 and 3 there is shown a paper that is not covered by the claims.
  • This sheet 7 is formed of a first band 3 and a second band 5.
  • the band 5 comprises clear watermarks 8 obtained for example by an embossed embossed fabric of the round shape 5. These clear watermarks have a depth e 1 .
  • the total thickness of the sheet 7 is the sum of the thicknesses e 3 of the strip 3 and e 5 of the strip 5.
  • the thickness e 2 of the sheet 7 facing the watermarks 8 is less than the total thickness e 1 .
  • the region 8 is such that the band 5 has a hole.
  • Thickness reduction is therefore about 33% in the first case and 50% in the second case.
  • the sheet of FIG. 3 thus has a reduced opacity much lower than the opacity of the sheet of FIG. 2, in region 8 and for a thickness e t that is substantially equal.
  • the sheet shown in FIG. 5 is made according to the technique of the monojet. This sheet is obtained by the process described in application EP-A-549 384 and is not covered by the claims of the present European patent.
  • the sheet 11 comporet zones 12, 12 a, 12 b, of thickness e 1 and zones 12, 12 has a thickness e 2 non-zero. Areas 12, 12a have a density of fibers much lower than the density of zones 12, 12 a, 12 b. Each zone 13, 13 has undergone additional transparency. This transparency is carried out chemically according to this embodiment. Preferably, the transparentization is carried out using a transparency composition described in European patent EP-91 341. The additional transparency is performed after drying of the sheet at the end of the machine.
  • This composition is applied for example by printing using an engraved printing cylinder, engraving of the cylinder corresponding to the zones 13, 13 has to transparentiser.
  • Figure 6 shows in section a sheet 14 obtained by the technique of the "bijet" represented on the figure 1.
  • the sheet 14 shown in FIG. 6 is formed a first band 16 and a second band 17.
  • Band 17 is such that it has areas 18 zero thickness.
  • the band 16 can be transparent or not in the areas next to zones 18.

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  • Paper (AREA)
  • Credit Cards Or The Like (AREA)

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 sheet of paper security with localized areas of thickness and reduced opacity and more particularly a paper for banknotes or a security paper comprising important areas of thickness and opacity reduced, at 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 relates preferably to a sheet paper having at least one area having a uniform average opacity of at least 40% compared 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 leaf obtained by wet process using a suspension of natural cellulose fibers and / or fibers synthetic materials that may contain various various additives commonly used in stationery.

On connaít déjà dans la technique antérieure des papiers qui sont transparentisés. 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). Ces papiers sont rendus transparents sur toute leur surface et sont destinés à des applications pour le dessin industriel, la reproduction de plans, etc.We already know in the prior art papers that are transparent. These papers are for example made transparent by compositions chemicals (see in particular French Patent No. 82 05124, filed March 15, 1982 by ARJOMARI-PRIOUX). These papers are made transparent on their entire surface and are intended for applications for industrial design, reproduction of plans, etc.

On connaít aussi des procédés chimiques de transparentisation partielle, c'est-à-dire à des endroits déterminés. Ces procédés utilisent des compositions à base de graisse ou d'huile minérale ou végétale qui sont déposées par impression. Cependant, il est difficile d'imprimer sur ces zones transparentisées à l'aide de techniques usuelles actuelles d'impression (offset, taille-douce, héliographie, etc.).We also know chemical processes of partial transparency, ie in places determined. These methods use compositions base of fat or mineral or vegetable oil that are deposited by printing. However, it is difficult to print on these transparent areas using current standard printing techniques (offset, intaglio, heliography, 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. 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 Four-drinier). 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. 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. Au contraire, les zones foncées sont dues au fait que l'épaisseur de la feuille et la densité des fibres sont plus importantes.Moreover, it is known to realize differences thickness and density in the paper, especially by the watermark technique used for secure bank note papers, documents identity or official and valuable documents. These watermarks are obtained during the manufacture of the sheet of paper by round shapes with indentations and / or embossed or with rollers watermarkers with intaglio designs and / or raised associated with a flat table (Four-drinier machine). We then obtain an image which, when look at the sheet of paper in transmission, appears be clear, if the watermarking roll has a drawing embossed, or dark, if the watermark roll has a hollow design. The light areas are due to the fact that the thickness of the sheet and the density of the fibers are lower than the thickness of the leaf and the density of fibers in areas where there was no impression by the filigree roller. On the contrary, the dark areas are due to the fact that the thickness of the leaf and the density of fibers are more important.

De tels filigranes comportent des parties claires qui ont en général des superficies de quelques mm2 et la variation d'opacité entre la partie claire du filigrane et le papier non filigrané est faible. 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.Such watermarks have clear parts which generally have areas of a few mm 2 and the variation in opacity between the clear part of the watermark and the non-watermarked paper is small. If you want to print on the light areas of these watermarks, it is very difficult to match the light areas and printing and even with a very precise identification of watermarks, it is 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. 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. Les zones peuvent par exemple être réalisées sous forme de filigrane en utilisant des procédés par forme ronde ou par rouleaux filigraneurs.It has been described in the European patent application No. 388,090, filed on 9 March 1990 by DE LA RUE COMPANY PLC. a security paper with areas of reduced opacity at specific locations and well located, the zones allowing to see by transmission, with the naked eye, impressions on the face opposite to the face according to which one looks at the paper. Zones can for example be made under watermark shape using shape methods round or by watermarker rolls.

Or, dans cette demande de brevet, on ne décrit pas comment on obtient industriellement ces zones.However, in this patent application, it is not described not how one obtains industrially these zones.

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 cm2. Par contre, si l'on souhaite obtenir des zones dont la superficie est supérieure à 0,4 cm2, par la technique du filigrane l'homme du métier rencontre des problèmes techniques.Industrially, it is relatively easy to manufacture paper with areas of reduced thickness and thus clear, obtained by the watermark technique, when the area of these areas is less than 0.4 cm 2 . On the other hand, if it is desired to obtain areas whose area is greater than 0.4 cm 2 , by the watermark technique the person skilled 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. Par exemple, si on souhaite une zone circulaire claire, on embossera la toile avec un poinçon circulaire. Cependant, en utilisant un tel procédé, on n'obtient pas une zone claire d'opacité constante. 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. Si on utilise un rouleau filigraneur qui comporte des aspérités en relief, on obtient le même phénomène.The first problem is: To achieve a watermark, the skilled person knows that one can emboss the canvas with a round shape using a punch. For example, if you want a circular area clear, emboss the canvas with a circular punch. However, using such a process, one does not get a clear area of constant opacity. Indeed, we glimpse that fibers tend to settle in more large quantity near the center of the part embossed only on the edges and thus the center of the watermark appears much less clear than the edges. Yes we use a filigraner roll which has asperities in relief, we obtain the same phenomenon.

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 cm2, on n'obtient pas de zone claire.A second problem that arises is that when one wants areas of reduced thickness and therefore clear with an area of more than 0.4 cm 2 , one does not obtain a clear area.

On connaít par ailleurs divers moyens pour éviter la falsification des chèques. 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. Cependant, on cherche toujours de nouveaux moyens contre la falsification.We also know various ways to avoid falsification of checks. So, we can add in or on check paper for chemical compounds that react with acids, bases or erasers. However, we are always looking for new means 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 cm2, 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. 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.The European patent application filed on November 18, 1992 by the Applicant and published on June 30, 1993 under the number EP-A-549,384, describes a method of manufacturing a paper sheet comprising at least one zone having a reduced thickness relative to the thickness of the remainder of the sheet, and having an area of at least 0.4 cm 2 , by arranging on an embossed fabric or not, optionally arranged on a round shape, an aqueous dispersion containing at least cellulosic fibers, by draining the water to form the sheet, in the presence or absence of a filigree roller, by drying. Flexible parts are used which are associated with the filigranous fabric, the filigree roller or the round shape, so that the water dripping during the formation of the sheet in the zones of the flexible parts is reduced by compared to the draining of the water in the zones having no flexible part.

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. 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 of paper obtained by this process is such that the area having a reduced thickness has a thickness less than 40% of the thickness of the rest of the sheet. The sheet can also be such that said zone has a lower average opacity of up to 40 % of the opacity of the rest of the sheet.

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

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. Ces pièces doivent être fixées à des endroits déterminés et nécessitent donc une manipulation supplémentaire. De plus, la zone a une épaisseur inférieure de 30 % par rapport à l'épaisseur du reste de la feuille.In addition, the process requires a transformation of the paper machine, namely that one associates with the filigranous fabric, or the filigree roller, or the round shape, flexible parts. These parts must be fixed at specific locations and require therefore an additional manipulation. In addition, the area has a thickness of 30% less than the thickness of the rest of the leaf.

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. 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. 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. Une telle feuille de sécurité permet d'obtenir une feuille comportant un fil de sécurité plus ou moins apparent en surface.It has been described in EP-A-0 229 645 a method of manufacturing a security sheet comprising a security thread. It consists of forming a first layer of paper and a second layer of paper, to introduce a security element between these two layers, to join these two layers. One of layers has local regions whose thickness is 0 to 30% of the total thickness of the paper sheet. A such security sheet makes it possible to obtain a sheet comprising a security thread more or less apparent on the surface.

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. Sur cette zone transparente on reporte un hologramme. De tels billets en plastique ont cependant quelques inconvénients. Ils sont peu résistants à la manipulation et à la circulation car l'impression peut être fragile sur le plastique. 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. 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.We also know banknotes which consist of sheets of synthetic material transparent on which an impression is made double-sided, the impression being such that it leaves a completely transparent area. On this transparent area we postpone a hologram. Such notes in plastic however have some disadvantages. They are not very resistant to handling and circulation because the print can be fragile on the plastic. It is the reason why paper notes are preferred, but we want at the same time to realize a zone the more transparent possible. However, according to the method described in the document EP-A-549 384, the zone obtained is certainly of reduced thickness and reduced opacity, but wants an area of opacity even lower.

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 make a virtually transparent area in the paper or translucent, without breaking the paper in this zoned.

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 goal is to realize in the paper a virtually transparent or translucent area, this area that can be printed and / or 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 zone must therefore be sufficiently resistant to support the postponement 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 is therefore to provide areas of reduced thickness compared to the rest of the sheet without needing 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 much lower thickness reduced by 40% compared to 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 cm2, 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, l'épaisseur de la feuille dans ladite zone (8, 20) d'épaisseur et d'opacité réduites étant de jusqu'à 80% par rapport à l'épaisseur du reste de la feuille.For this purpose, the invention relates to a sheet of paper comprising at least one zone of reduced thickness and 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 layer of paper having at least one zone whose thickness is zero and a second layer of paper of substantially constant thickness, the two layers being directly joined together, the thickness of the sheet in said zone (8, 20) of reduced thickness and opacity being up to 80% with respect to the thickness of the remainder of the sheet.

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 part of the opacity area reduced a hologram, an iridescent bed, an impression using conventional inks or inks containing pigments colored, fluorescent pigments, luminescent, photochromic, piezo-optical, piezochromic compounds.

Le second jet peut être partiellement ou totalement transparentisé. 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. 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.The second throw can be partially or totally transparentized. In the case where the second throw is totally transparent, this jet can be obtained according to the technique of tracing paper, namely from a suspension of highly refined cellulose fibers, for get transparency. In the case where the second throw is partially transparent, it is transparent by chemical pathway in an area that comes in correspondence with the zone of zero thickness of the first jet.

La feuille selon la revendication 1 peut être réalisée selon le procédé de fabrication dans lequel :

  • on forme une première couche de papier sur une toile d'une première partie humide d'une machine à papier,
  • on forme une seconde couche de papier sur une toile d'une seconde partie humide d'une machine à papier,
  • la première couche de papier présentant au moins une région locale d'épaisseur nulle
  • on réunit directement les deux couches et on les sèche,
The sheet according to claim 1 may be made according to the manufacturing method in which:
  • a first layer of paper is formed on a web of a first wet part of a paper machine,
  • a second layer of paper is formed on a web of a second wet part of a paper machine,
  • the first layer of paper having at least one local region of zero thickness
  • the two layers are joined directly and dried,

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. La feuille de papier ne se différencie pas d'une feuille de papier réalisée sur une toile unique.Although the layers of paper are made on separate paper cloths, we obtain a sheet of paper that can no longer be separated into because of the rapid coupling of these layers and their drying in common. The sheet of paper does not not differentiate from a sheet of paper made on a unique 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 process is such that the thick regions none are made by embossed areas in relief on the mechanical canvas, from which it follows that the deposit of fibers in these areas is totally forbidden.

De préférence au moins une des couches du 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.Preferably at least one of the layers of paper are made in the form of a pattern simple geometrical form, particularly in the form of approximately rectangular, round or elliptical or any other form.

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.

  • La figure 1 montre un dispositif pouvant servir à la fabrication de papier de sécurité selon l'invention.
  • Les figures 2, 3 et 5 montrent en coupe divers papiers qui ne sont pas couverts par les revendications.
  • Les figures 4 et 6 montrent en coupe des papiers selon l'invention.
  • La figure 7 montre un papier pour chèques obtenu selon l'invention.
    • The following description, with reference to the accompanying drawings by way of non-limiting examples, will make it possible to understand how the invention can be put into practice.
  • Figure 1 shows a device that can be used for the manufacture of security paper according to the invention.
  • Figures 2, 3 and 5 show in section various papers that are not covered by the claims.
  • Figures 4 and 6 show in section papers according to the invention.
  • Figure 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. Le dispositif correspond essentiellement aux machines à papier habituelles du commerce, qui comprennent au moins deux parties humides séparées. 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. Dans la partie humide 1 on réalise une première bande de papier 3, qui est dirigée vers la seconde partie humide 2 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.Figure 1 shows a device that can be used to make a paper according to the invention. The device basically corresponds to paper machines usual trade practices, which include at least two separate wet areas. The embodiment preferred shown here is constituted by a combination of two round wet sections 1 and 2 of a so-called double-round paper machine. In the wet part 1 a first strip of paper 3, which is directed towards the second wet part 2 being suspended beneath the takeup felt 4. In the second installation 2, a second 5. The two strips of paper are gathered at the level of the roll 6 and are then dried.

    On utilise de préférence pour la réalisation des deux couches de papier deux installations à forme ronde. 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.It is preferable to use for the realization of two layers of paper two form installations round. But it is also possible to realize the two layers of paper in table settings flat, or use for making both layers of paper a combination of a table installation flat and a round-shaped installation.

    Sur les figures 2 et 3, on a représenté un papier qu'il n'est pas couvert par les revendications. 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 e1. L'épaisseur totale et de la feuille 7 est la somme des épaisseurs e3 de la bande 3 et e5 de la bande 5. L'épaisseur e2 de la feuille 7 en regard des filigranes 8 est inférieure à l'épaisseur totale el. Sur la figure 2, on a e1 =1/3 et = 33,3 et.In Figures 2 and 3, there is shown a paper that is not covered by the claims. This sheet 7 is formed of a first band 3 and a second band 5. The band 5 comprises clear watermarks 8 obtained for example by an embossed embossed fabric of the round shape 5. These clear watermarks have a depth e 1 . The total thickness of the sheet 7 is the sum of the thicknesses e 3 of the strip 3 and e 5 of the strip 5. The thickness e 2 of the sheet 7 facing the watermarks 8 is less than the total thickness e 1 . In Figure 2, ae 1 = 1/3 e t = e t 33.3.

    Sur la figure 3, on a e1 =1/2 et = 50% el.In FIG. 3, we have 1 = 1/2 and t = 50% e 1 .

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

    La réduction d'épaisseur est donc de 33% environ dans le premier cas et de 50% dans le second cas. 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 et totale sensiblement égale.Thickness reduction is therefore about 33% in the first case and 50% in the second case. The sheet of FIG. 3 thus has a reduced opacity much lower than the opacity of the sheet of FIG. 2, in region 8 and for a thickness e t that is substantially equal.

    En réglant les épaisseurs e3 et e5 des bandes 3 et 5, ainsi que la profondeur e1 des filigranes 8, on peut obtenir les opacités et les épaisseurs réduites que l'on désire.By adjusting the thicknesses e 3 and e 5 of the strips 3 and 5, as well as the depth e 1 of the watermarks 8, it is possible to obtain the desired opacities and reduced thicknesses.

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

    La feuille 11 comporet des zones 12, 12a, 12b, d'épaisseur e1 et des zones 12, 12a, d'épaisseur e2 non nulle. Les zones 12, 12a ont une densité de fibres bien inférieure à la densité des zones 12, 12a, 12b. Chaque zone 13, 13a subit une transparentisation supplémentaire. Cette transparentisation est réalisée par voie chimique selon ce mode de réalisation. 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.The sheet 11 comporet zones 12, 12 a, 12 b, of thickness e 1 and zones 12, 12 has a thickness e 2 non-zero. Areas 12, 12a have a density of fibers much lower than the density of zones 12, 12 a, 12 b. Each zone 13, 13 has undergone additional transparency. This transparency is carried out chemically according to this embodiment. Preferably, the transparentization is carried out using a transparency composition described in European patent EP-91 341. The additional transparency is performed after drying of the sheet at the end of the machine.

    Cette composition peut par exemple être constitués de:

  • 12 % d'une résine de condensation cétone - aldéhyde modifiée
  • 23 % d'une résine hexaméthoxyméthylmélaminée
  • 4 % d'alcool éthylique
  • 17 % d'alcool butylique
  • 28 % de dibutylphtalate
  • 16 % de produits isopar affiniqués.
    • This composition may for example consist of:
  • 12% of a modified ketone-aldehyde condensation resin
  • 23% of a hexamethoxymethylmelamine resin
  • 4% ethyl alcohol
  • 17% butyl alcohol
  • 28% dibutylphthalate
  • 16% of affinity isopar 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, 13a à transparentiser.This composition is applied for example by printing using an engraved 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 by the technique of the "bijet" represented on the 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. La bande 16 peut être transparentisée ou non dans les zones situées en regard des zones 18. The sheet 14 shown in FIG. 6 is formed a first band 16 and a second band 17. Band 17 is such that it has areas 18 zero thickness. The band 16 can be transparent or not in the areas next to zones 18.

    Claims (8)

    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 comprises 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, the thickness of the sheet in the said region (18,20) of reduced thickness and opacity is up to 80% with respect to the thickness of the rest of the sheet.
    2. Sheet of security paper comprising at least one region (8, 20) of reduced opacity according to Claim 1, characterized in that the said region (8,20) 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.
    3. Sheet according to Claim 1 or 2, 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.
    4. Sheet according to any one of Claims 1 to 3, 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.
    5. Sheet according to one of Claims 2 to 4, 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.
    6. Sheet according to one of Claims 2 to 4, 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).
    7. Application of a sheet according to one of Claims 1 to 6 as paper for bank-notes.
    8. Application of a sheet according to one of Claims 1 to 6 as security paper.
    EP94908388A 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)

    Applications Claiming Priority (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)

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

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    EP (1) EP0687324B2 (en)
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    ES (1) ES2142937T5 (en)
    WO (1) WO1994020679A1 (en)

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    US6402888B1 (en) 2002-06-11
    WO1994020679A1 (en) 1994-09-15
    ES2142937T3 (en) 2000-05-01
    EP0687324A1 (en) 1995-12-20
    DE69422705T3 (en) 2006-08-17
    DE69422705T2 (en) 2000-10-05
    DE69422705D1 (en) 2000-02-24
    EP0687324B1 (en) 2000-01-19
    ES2142937T5 (en) 2006-07-16

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