WO2000032874A1 - Uncoated paper comprising a pseudo-watermark and method for making same - Google Patents

Uncoated paper comprising a pseudo-watermark and method for making same Download PDF

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Publication number
WO2000032874A1
WO2000032874A1 PCT/FR1999/002947 FR9902947W WO0032874A1 WO 2000032874 A1 WO2000032874 A1 WO 2000032874A1 FR 9902947 W FR9902947 W FR 9902947W WO 0032874 A1 WO0032874 A1 WO 0032874A1
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WO
WIPO (PCT)
Prior art keywords
paper
zones
zone
uncoated
rest
Prior art date
Application number
PCT/FR1999/002947
Other languages
French (fr)
Inventor
Michel Goguelin
Henri Rosset
Original Assignee
Arjo Wiggins S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arjo Wiggins S.A. filed Critical Arjo Wiggins S.A.
Priority to AU13916/00A priority Critical patent/AU1391600A/en
Priority to EP99973085A priority patent/EP1135556B1/en
Priority to BR9915844-2A priority patent/BR9915844A/en
Priority to AT99973085T priority patent/ATE237030T1/en
Priority to DE69906789T priority patent/DE69906789D1/en
Publication of WO2000032874A1 publication Critical patent/WO2000032874A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/10Watermarks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/24Pressing or stamping ornamental designs on surfaces
    • 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
    • D21H27/02Patterned paper
    • 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
    • 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
    • D21H25/00After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • 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
    • D21H27/30Multi-ply
    • 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
    • D21H27/30Multi-ply
    • D21H27/32Multi-ply with materials applied between the sheets

Definitions

  • the present invention relates to an uncoated paper comprising at least one pseudo-watermark consisting of a mark giving the said paper a visual effect and a texture resembling that of a watermark.
  • the present invention also relates to a method of manufacturing an uncoated paper according to the invention.
  • Watermark papers are generally used in the field of security papers such as means of payment such as banknotes or checks, letter-checks and official documents such as passports, identity cards, stamped papers, deeds notarized, or entry tickets to cultural or sporting events because the presence of the watermark limits the possibilities of reproduction by photocopying and counterfeiting, and offers a means of recognition and / or authentication of said paper.
  • Watermark papers are also used in the field of personalized corporate papers, using the company's logo, name or brand as a watermark. It may turn out that these watermarked papers are requested in very low tonnages and / or in short manufacturing times.
  • the "real" watermarks are obtained during the manufacture of the sheet of paper, in the wet part of the paper machine, by round shapes comprising imprints or embossings in hollow and / or in relief or using watermark rollers with embossing and / or embossing associated with a flat table (Fourdrinier machine).
  • a pattern is then obtained which includes light areas, when looking at the sheet of paper by observation in transmitted light, if the prints are made in relief, or dark or shaded areas, if the prints are made in hollow.
  • the light areas are due to the fact that the thickness of the sheet and the quantity of fibers (areal mass) are smaller in the areas corresponding to the imprints than in the rest of the paper sheet.
  • the dark areas are due to the fact that the thickness of the sheet and the quantity of fibers are greater in the areas corresponding to the imprints.
  • These wet part watermarking methods imply costly means of implementation specific for each type of watermark such as the watermark rollers which are produced by etching the watermark motif and therefore do not offer the necessary flexibility from an economic point of view and also desired by applicants for a custom watermark to make watermark papers in small quantities.
  • W097 / 17493 has described papers coated with pseudo-watermarks resulting from a variation in the layer weight applied in determined zones which induces a variation in thickness and opacity in the said zones where the layer weight is reduced or increased.
  • An object of the present invention is to provide an uncoated paper comprising pseudo-watermarks consisting of marks which locally modify the physical characteristics of the paper such as its mass volume and therefore certain properties such as its thickness and possibly its opacity.
  • Another object of the present invention is to provide an uncoated paper having pseudo-watermarks consisting of marks which create a shade contrast with the rest of the sheet of paper.
  • Another object of the present invention is to provide an uncoated paper comprising pseudo-watermarks produced without recourse to the application of a varnish on its surface so that the composition of the paper in the areas constituting the pseudo-watermark is not not significantly changed.
  • Another object of the present invention is to provide uncoated paper with pseudo-watermarks whose usage properties, in particular the printability properties in the areas of the surface of the paper corresponding to said marks, are not significantly altered compared to other areas not marked by a so-called paper watermark.
  • Another object of the present invention is to provide an uncoated paper having pseudo-watermarks which can be produced in variable and small quantities under more economical conditions than by the processes of the prior art and which can be obtained in widths and quantities independent of the characteristics of the paper machine, in particular by a process whose use of the machines does not modify the operation of manufacturing the paper proper.
  • Another object of the present invention is to provide an uncoated paper having a pseudo-watermark in which said watermark is produced after the last manufacturing operation, that is to say at the outlet of the dryer, possibly on the finished paper, c is to say off-line manufacturing.
  • the present invention provides an uncoated paper comprising at least one mark resembling a watermark, characterized in that one or more determined zone (s) of the paper have a reduction in thickness compared to the rest of the paper.
  • the surface mass in the said zone or zones of the paper being identical to that of the rest of the paper.
  • the grammages are identical in the said zone or zones and in the rest of the paper, it being understood that the variation in weight which may result from the presence of an additive not evaporated from the rewetting solution is not significant.
  • the one or more zones have a reduction in opacity relative to the rest of the paper.
  • the said zone or zones have a color, in particular a shade and / or a brightness, different from that of the rest of the paper.
  • the paper may have a reduction in thickness and opacity in the said zone or zones relative to the rest of the paper.
  • the paper can present, in the said zone or zones, agents chosen from coloring agents, fluorescent agents, fluorescence inhibiting agents, agents allowing recognition or authentication. These agents may have been deposited by incorporating the re-wetting solution, described below, containing them and may have remained after evaporation of the solution. Anti-forgery or authentication agents are well known to those skilled in the art in the field of fiduciary and security papers.
  • the paper can comprise two or more fibrous jets.
  • only one of the surface jets has a reduction in thickness and / or a difference in shade and / or brightness in the said zone or zones relative to the rest of the multi-jet paper.
  • the paper can comprise two or more sheets of laminated paper.
  • the lamination adhesive is colored.
  • only one sheet of the laminated paper has a reduction in thickness and / or a difference in shade and / or difference in brightness in the said zone or zones relative to the rest of the laminated paper.
  • the present invention also provides a method of manufacturing an uncoated paper having at least one mark resembling a watermark as described above, characterized in that said mark is produced after the step of drying the paper, or in particular outside papermaking line, by carrying out the steps in which: a) a rewetting solution is applied to at least one face of the uncoated paper, in one or more determined zone (s) then, b) a pressure and heat in said area (s) of rewetted uncoated paper so as to evaporate said solution and densify uncoated paper in said area (s) relative to the rest of the paper.
  • uncoated paper means that the paper is not coated with a pigmented layer comprising at least fine mineral pigments, in particular kaolin and / or calcium carbonate, and at least one binder or adhesive. , in particular starch or latex, as well as, optionally, any additives commonly used by those skilled in the art, the function of which is to improve the rheological properties of the sauce and to confer particular properties on the layer.
  • the paper can be impregnated or surface treated with a non-pigmented composition such as a sizing composition, in particular to improve its printability, and / or its mechanical resistance and / or its resistance to soiling and / or its bactericidal properties.
  • a non-pigmented composition such as a sizing composition
  • rewetted paper is meant that, in the said zone or zones, the rewetting solution has penetrated inside the paper and has not yet evaporated.
  • said rewetting solution is evaporated and the paper is densified in the areas where said solution was initially applied. This results in an increase in the density of the paper in said zones relative to the rest of the sheet of paper and more precisely a reduction in thickness with a surface mass identical to that of the rest of the paper.
  • Said zones can then present an opacity contrast (reduction of opacity) and / or a color contrast, in particular of color nuance and brightness with the rest of the sheet of paper.
  • the opacity of the paper is partly linked to the presence of air in the fibrous and / or pigmented interstices of the paper.
  • the solution replaces the air in said interstices.
  • the solution is evaporated and the fibers and / or pigments being densified, the air interstices generally occupy a reduced volume and in particular are found in a smaller quantity than initially, which generates deopacification.
  • the densification of the paper comes from a reduction in thickness of the areas treated relative to the rest of the paper, the surface mass remaining constant relative to the rest of the paper.
  • the surface mass is less in the light areas because the fibers deposited are in smaller quantity compared to the rest of the sheet.
  • the surface mass is not constant because the weight of the layer is reduced in certain areas.
  • Rewetting the paper makes it easier to rearrange the fibers and / or pigments during calendering.
  • There may be additives in the rewetting solution which facilitate the rearrangement of the fibers and / or pigments and / or which promote the greater or lesser penetration of said solution into the paper.
  • the method of the present invention can also create a change in the color of the paper in the said zone or zones when said re-wetting solution comprises a coloring agent, in particular a tinting coloring agent.
  • a coloring agent in particular a tinting coloring agent.
  • the color contrast in the said zone or zones can also result from the modification of the opacity in one of the surface jets when there is a difference in shade initially between said surface jet and the jet which is Hey.
  • the method according to the present invention is applicable to all uncoated, white or colored papers, without limitation of grammage, possibly laminated or multijet.
  • step (b) said pressure and said heat are applied by calendering the paper.
  • the calender rollers can be heated, but in any event the friction produced by the calender generates heat.
  • the calendering operation is carried out according to the present invention with calenders known to those skilled in the art.
  • the calenders can be of the supercalender, soft calender type.
  • the ridges and reliefs are more or less flattened when passing between the rollers and the sheet is densified.
  • the purpose of calendering can also be to make surfaces shiny or satin.
  • the calender rollers are made of hardened cast iron or steel, some of which can be covered with a fabric, cardboard or plastic for example to make elastic rollers.
  • the supercalender which has a large number of rollers (of the order of 12 or more), is often located outside the machine due to maintenance, changing of the rollers and sheet breaks.
  • the soft grille can be located on the paper machine, the number of rollers is lower and some are elastic.
  • the boom is located on a machine and has a few rollers, often made of steel, and is not covered.
  • the linear pressure exerted between the rollers on the paper is of the order of 0.5 to 5000 kN / cm.
  • the temperature of the rollers when heated can be 50 to 300 ° C.
  • the different calendering parameters such as the temperature, the hardness of the rollers, the coating, if any, of the rollers, the extent of the contact area between the rollers and the sheet as well as the pressure are chosen according to the nature of the desired final contrast.
  • These different parameters are adapted as a function of the calendering speed, itself controlled by the speed of application of the rewetting solution.
  • a calender comprising 2 to 6 rollers and if necessary with a plastic coating (for its impermeability to rewetting solution) is used.
  • the mark may correspond to the said zone or zones and constitute a given pattern appearing in positive contrast with respect to the rest of the sheet of non-rewetted paper.
  • the given pattern may appear as a negative contrast in so far as the mark corresponds to said remainder of the sheet of untreated paper, that is to say not rewetted initially.
  • the said zone or zones may define a visual pattern under observation in transmitted light resulting from a reduction in opacity in the said zone or zones.
  • the said zone or zones can also define a visual pattern by observation in reflected light resulting from a difference in color of the said zone or zones.
  • step (a) is carried out on off-line production paper, that is to say on finished paper.
  • the rewetting solution according to the invention can be applied using a rotogravure device comprising a rotogravure cylinder whose imprints or hollow cells have a shape such that they allow 'applying said rewetting solution according to a pattern corresponding to said mark in said zone or zones.
  • the re-wetting solution is applied using a device of the type of those used in the ink jet printing processes, in particular the ink jet printing processes on a reel, it being understood that the 'said ink is replaced by said aqueous rewetting solution.
  • Ink-jet printing devices in particular digital ink-jet printing devices, make it possible to create marks in various patterns which can be changed quickly and inexpensively from one production to another.
  • Said rewetting solution may advantageously comprise a wetting agent so as to improve or accelerate the penetration of the solution into the paper.
  • Said wetting agent may be advantageous, in particular according to the characteristics of the paper, in particular its porosity and the possible presence or not in the latter of a wetting agent and also according to the amount of re-wetting solution applied. By way of illustration, a quantity of 2 to 20 g / m 2 of rewetting solution can be applied.
  • said rewetting solution is a solution of a hydrophilic polar solvent.
  • the rewetting solution is an aqueous solution, the use of a non-aqueous solvent inducing additional costs and risks of pollution.
  • a hydroalcoholic solution can be used as rewetting solution.
  • an aqueous solution containing from 1 to 10% by volume of ethanol, in particular 2%, in water, or an aqueous solution containing from 1 to 10% by weight of 2-pyrrolidone, in particular 2% can be used. in water.
  • the re-wetting solution may also contain additives such as dyes, in particular tinting dyes, fluorescent whitening agents (optical brighteners) or conversely fluorescence inhibiting agents as well as any additives known to those skilled in the art. art to allow the recognition or authentication of so-called security papers.
  • the re-wetting solution may comprise an antifalsification agent or colorless authentication agent capable of being revealed by reaction with a determined co-reactant or under specific conditions.
  • a Hewlett Packard Deskjet 560 C desktop printer is used fitted with a cartridge reference 51626A previously emptied of its ink, cleaned then filled with a rewetting solution consisting distilled water and 2% volume of ethanol, in order to rewet the papers below.
  • the marks are in positive, unless otherwise specified, and the amount of rewetting solution provided, for a rewetted solid with a resolution of 600 ⁇ 300 dots per inch, and the so-called “coarse” screening conditions, so-called “mail” and so-called “normal” intensity control quality is around 12 g / m2.
  • the papers, immediately rewetted, are passed through a laboratory calender with two rollers heated to 50 ° C, under a linear pressure of 3.0 kN / cm.
  • EXAMPLE 1 OPACITY CONTRAST On a sheet of uncoated white paper of 80 g / m 2 in A4 format, marketed under the brand RG® of the company GUERIMAND SA, it is represented by rewetting and calendering according to the conditions given above. , a motif which is a character holding a closed umbrella in his hand, using MICROSOFT POWER POINT ® software. We obtain a paper with marks according to the pattern similar to a translucent shaded watermark. The variable thickness reduction in the treated area can be up to 40% compared to the rest of the paper.
  • EXAMPLE 2 OPACITY CONTRAST
  • EXAMPLE 3 OPACITY CONTRAST AND COLOR GAP (SHADE AND BRIGHTNESS)
  • the motif is reproduced in two different places, according to an identity photograph of a person, according to the general conditions mentioned above, however for one of the reproductions (a), the dark parts of the photograph were made by rewetting, and for the other reproduction (b), the light portions of the photograph were rewetted, thus appearing in negative.
  • the paper thus obtained is a security paper personalized by the double pseudo-watermark of identity photography which is recognized By direct vision, in reflected light, in the form of shade contrast, we observe ( at).
  • EXAMPLE 5 An uncoated 170 g / m 2 bijet paper is produced on a laboratory form. One of the jets is white and has a grammage of 90 g / m 2 and the other jet is of green shade and also has a grammage of 80 g / m 2
  • the reworking and calendering represents the motif of the character holding in his hand a closed umbrella, using the POWER POINT ® software from MICROSOFT.
  • POWER POINT ® software from MICROSOFT.
  • An uncoated laminated paper of 210 g / m 2 is produced by laminating two uncoated white papers having a basis weight of 90 g / m 2 using an adhesive based on poly (vinyl acetate) and comprising 3% by weight of a shading dye, VIOLET BB 200%.
  • the reworking and calendering represents the motif of the character holding in his hand a closed umbrella, using the POWER POINT ® software from MICROSOFT.
  • POWER POINT ® software from MICROSOFT.
  • the pseudofiligrane is produced as in Example 7.
  • a paper is obtained having marks according to the pattern similar to a translucent watermark but it has better visibility in transmitted light, since the amount of dye is less than that of the 'example 7.
  • the rewetting solution consists of distilled water and 2% by weight of 2-pyrrolidone (98% purity). After calendering at 50 ° C a paper similar to that of Example 3, under a linear pressure of 1.0 kN / cm, a paper is obtained with a pseudo-watermark according to the invention, by shade contrast and opacity.
  • EXAMPLE 12 On a soft grille with a small width, an inkjet printer printhead
  • SCITEX 6240 was installed one meter from the calender rollers. Printing and calendering speed are synchronized.
  • a rewetting solution for the paper a mixture of demineralized water and 5% by volume of ethanol is used.
  • the grille consists of two rollers; one is made of steel and the counter roller has a plastic covering. These rollers are heated to 80 ° C and the linear pressure between the rollers is 2.5 kN / cm.
  • the reel is unwound from a sheet of white paper, a pattern is made with the rewetting solution using the print head on the sheet, then the said sheet is passed between the two rollers of the calender.
  • the running speed of the paper sheet is 20 m / min.
  • the dry paper sheet has a thickness of 60 ⁇ m and has been densified in the rewetting zones by a thickness reduction of 16 ⁇ m.
  • a paper is obtained with a pseudofiligrane according to the invention, by reduction of thickness.

Abstract

The invention concerns an uncoated paper comprising at least a mark resembling a watermark, characterised in that one or several specific zones of the paper has a reduced thickness with respect to the rest of the paper, the mass per unit area in said zone(s) of the paper being identical to that of the rest of the paper. The invention also concerns a method for making uncoated paper comprising at least a mark resembling a watermark characterised in that it consists of producing said mark after the paper-drying step, by the following steps which consist in: a) applying a wetting solution on at least one face of the uncoated paper; then b) applying pressure and heat in said zone(s) so as to evaporate said solution and densify the non-coated paper in said zone(s) with respect to the rest of the paper.

Description

PAPIER NON COUCHE COMPORTANT UN PSEUDO-FILIGRANE ET PROCEDE DE UNCOATED PAPER COMPRISING A PSEUDO-FILIGRANE AND PROCESS FOR PRODUCING THE SAME
FABRICATIONMANUFACTURING
La présente invention concerne un papier non couché comprenant au moins un pseudo-filigrane consistant en une marque conférant au dit papier un effet visuel et une texture ressemblant à ceux d'un filigrane.The present invention relates to an uncoated paper comprising at least one pseudo-watermark consisting of a mark giving the said paper a visual effect and a texture resembling that of a watermark.
La présente invention concerne également un procédé de fabrication d'un papier non couché selon l'invention.The present invention also relates to a method of manufacturing an uncoated paper according to the invention.
Les papiers filigranes sont en général utilisés dans le domaine des papiers de sécurité tels que les moyens de paiement comme les billets de banque ou les chèques, les lettres- chèques et les documents officiels comme les passeports, cartes d'identité, papiers timbrés, actes notariés, ou encore les billets d'entrée à des manifestations culturelles ou sportives car la présence du filigrane limite les possibilités de reproduction par photocopie et de contrefaçon, et offre un moyen de reconnaissance et/ou d'authentification dudit papier. Les papiers filigranes sont aussi utilisés dans le domaine des papiers d'entreprise personnalisés en reprenant sous forme de filigrane le logo, le nom ou une marque de l'entreprise. Il peut s'avérer que ces papiers filigranes soient demandés dans de très faibles tonnages et/ou dans de courts délais de fabrication.Watermark papers are generally used in the field of security papers such as means of payment such as banknotes or checks, letter-checks and official documents such as passports, identity cards, stamped papers, deeds notarized, or entry tickets to cultural or sporting events because the presence of the watermark limits the possibilities of reproduction by photocopying and counterfeiting, and offers a means of recognition and / or authentication of said paper. Watermark papers are also used in the field of personalized corporate papers, using the company's logo, name or brand as a watermark. It may turn out that these watermarked papers are requested in very low tonnages and / or in short manufacturing times.
Il est connu de réaliser des papiers filigranes de différentes manières selon que l'on réalise des filigranes véritables ou des « pseudo filigranes ».It is known to produce watermarks in different ways depending on whether real watermarks or “pseudo watermarks” are produced.
Jusqu'à présent, différents procédés ont été proposés en vue de réaliser des papiers filigranes qui peuvent être classés en deux catégories.Until now, various methods have been proposed with a view to producing watermarked papers which can be classified into two categories.
1 - Les filigranes « véritables » sont obtenus lors de la fabrication de la feuille de papier, dans la partie humide de la machine à papier, par des formes rondes comportant des empreintes ou embossages en creux et/ou en relief ou à l'aide de rouleaux filigraneurs comportant des embossages en creux et/ou en relief associés à une table plate (machine Fourdrinier). On obtient alors un motif qui comporte des zones claires, lorsqu'on regarde la feuille de papier par observation en lumière transmise, si les empreintes sont réalisées en relief, ou des zones sombres ou ombrées, si les empreintes sont réalisées en creux. Les zones claires sont dues au fait que l'épaisseur de la feuille et la quantité de fibres (masse surfacique) sont plus faibles dans les zones correspondant aux empreintes que dans le reste de la feuille de papier. Inversement, les zones foncées sont dues au fait que l'épaisseur de la feuille et la quantité de fibres sont plus importantes dans les zones correspondant aux empreintes. Ces procédés de filigranage en partie humide impliquent des moyens de réalisation onéreux spécifiques pour chaque type de filigrane tels que les rouleaux filigraneurs qui sont réalisés par gravure du motif du filigrane et n'offrent donc pas la souplesse nécessaire d'un point de vue économique et aussi souhaitée par les demandeurs d'un filigrane personnalisé pour fabriquer des papiers filigranes en petites quantités.1 - The "real" watermarks are obtained during the manufacture of the sheet of paper, in the wet part of the paper machine, by round shapes comprising imprints or embossings in hollow and / or in relief or using watermark rollers with embossing and / or embossing associated with a flat table (Fourdrinier machine). A pattern is then obtained which includes light areas, when looking at the sheet of paper by observation in transmitted light, if the prints are made in relief, or dark or shaded areas, if the prints are made in hollow. The light areas are due to the fact that the thickness of the sheet and the quantity of fibers (areal mass) are smaller in the areas corresponding to the imprints than in the rest of the paper sheet. Conversely, the dark areas are due to the fact that the thickness of the sheet and the quantity of fibers are greater in the areas corresponding to the imprints. These wet part watermarking methods imply costly means of implementation specific for each type of watermark such as the watermark rollers which are produced by etching the watermark motif and therefore do not offer the necessary flexibility from an economic point of view and also desired by applicants for a custom watermark to make watermark papers in small quantities.
2 - Il est connu de réaliser des « pseudo-filigranes » par pénétration ou impression dans des zones déterminées du papier d'une composition qui agit soit en transparentisant le matelas fibreux de la feuille de papier de façon permanente, soit en vernissant la surface. Ces procédés altèrent de manière significative les propriétés de surface du papier ainsi traité, notamment l' imprimabilité.2 - It is known to produce "pseudo-watermarks" by penetration or printing in specific areas of the paper with a composition which acts either by permanently transparentizing the fibrous mat of the sheet of paper, or by varnishing the surface. These methods significantly alter the surface properties of the paper thus treated, in particular the printability.
On a décrit dans W097/17493 des papiers couchés avec des pseudo-filigranes résultant d'une variation du poids de couche appliqué dans des zones déterminées ce qui induit une variation d'épaisseur et d'opacité dans les dites zones où le poids de couche est réduit ou augmenté. Un but de la présente invention est de fournir un papier non couché comportant des pseudo-filigranes consistant en des marques qui modifient de façon localisée les caractéristiques physiques du papier telles que son volume massique et partant certaines propriétés telles que son épaisseur et éventuellement son opacité.W097 / 17493 has described papers coated with pseudo-watermarks resulting from a variation in the layer weight applied in determined zones which induces a variation in thickness and opacity in the said zones where the layer weight is reduced or increased. An object of the present invention is to provide an uncoated paper comprising pseudo-watermarks consisting of marks which locally modify the physical characteristics of the paper such as its mass volume and therefore certain properties such as its thickness and possibly its opacity.
Un autre but de la présente invention est de fournir un papier non couché présentant des pseudo-filigranes consistant en des marques qui créent un contraste de nuance avec le reste de la feuille de papier.Another object of the present invention is to provide an uncoated paper having pseudo-watermarks consisting of marks which create a shade contrast with the rest of the sheet of paper.
Un autre but de la présente invention est de fournir un papier non couché comportant des pseudo-filigranes réalisés sans recours à l'application d'un vernis à sa surface de sorte que la composition du papier dans les zones constituant le pseudo-filigrane ne soit pas significativement modifiée.Another object of the present invention is to provide an uncoated paper comprising pseudo-watermarks produced without recourse to the application of a varnish on its surface so that the composition of the paper in the areas constituting the pseudo-watermark is not not significantly changed.
Un autre but de la présente invention est de fournir un papier non couché avec des pseudo-filigranes dont les propriétés d'usage, en particulier les propriétés d' imprimabilité dans les zones de la surface du papier correspondant aux dites marques, ne soient pas significativement altérées par rapport aux autres zones non marquées par un dit pseudo filigrane du papier.Another object of the present invention is to provide uncoated paper with pseudo-watermarks whose usage properties, in particular the printability properties in the areas of the surface of the paper corresponding to said marks, are not significantly altered compared to other areas not marked by a so-called paper watermark.
Un autre but de la présente invention est de fournir un papier non couché présentant des pseudo-filigranes qui puisse être fabriqué en quantités variables et faibles dans des conditions plus économiques que par les procédés de la technique antérieure et qui puisse être obtenu en laizes et quantités indépendantes des caractéristiques de la machine à papier, en particulier par un procédé dont la mise en oeuvre des machines ne modifie pas l'opération de fabrication du papier proprement dite.Another object of the present invention is to provide an uncoated paper having pseudo-watermarks which can be produced in variable and small quantities under more economical conditions than by the processes of the prior art and which can be obtained in widths and quantities independent of the characteristics of the paper machine, in particular by a process whose use of the machines does not modify the operation of manufacturing the paper proper.
Un autre but de la présente invention est de fournir un papier non couché présentant un pseudo-filigrane dans lequel ledit filigrane est réalisé après la dernière opération de fabrication, c'est à dire en sortie de la sècherie, éventuellement sur le papier fini, c'est à dire hors ligne de fabrication.Another object of the present invention is to provide an uncoated paper having a pseudo-watermark in which said watermark is produced after the last manufacturing operation, that is to say at the outlet of the dryer, possibly on the finished paper, c is to say off-line manufacturing.
Pour ce faire, la présente invention fournit un papier non couché comportant au moins une marque ressemblant à un filigrane caractérisé en ce que une ou des zone(s) déterminée(s) du papier présentent une réduction d'épaisseur par rapport au reste du papier non couché, la masse surfacique dans la ou lesdites zones du papier étant identique à celle du reste du papier. En particulier, les grammages sont identiques dans la ou lesdites zones et dans le reste du papier, étant entendu que la variation de poids pouvant résulter de la présence d'un additif non évaporé de la solution de remouillage n'est pas significative. Dans un mode de réalisation, la ou lesdites zones présentent une réduction d'opacité par rapport au reste du papier.To do this, the present invention provides an uncoated paper comprising at least one mark resembling a watermark, characterized in that one or more determined zone (s) of the paper have a reduction in thickness compared to the rest of the paper. uncoated, the surface mass in the said zone or zones of the paper being identical to that of the rest of the paper. In particular, the grammages are identical in the said zone or zones and in the rest of the paper, it being understood that the variation in weight which may result from the presence of an additive not evaporated from the rewetting solution is not significant. In one embodiment, the one or more zones have a reduction in opacity relative to the rest of the paper.
Selon une variante de réalisation, la ou lesdites zones présentent une couleur notamment une nuance et/ou une luminosité, différente de celle du reste du papier.According to an alternative embodiment, the said zone or zones have a color, in particular a shade and / or a brightness, different from that of the rest of the paper.
Dans les papiers selon l'objet de la présente invention, le papier peut présenter une réduction d'épaisseur et d'opacité dans la ou lesdites zones par rapport au reste du papier.In the papers according to the object of the present invention, the paper may have a reduction in thickness and opacity in the said zone or zones relative to the rest of the paper.
Selon la présente invention, le papier peut présenter, dans la ou lesdites zones, des agents choisis parmi des agents colorants, des agents fluorescents, des agents inhibiteurs de fluorescence, des agents permettant la reconnaissance ou l'authentification. Ces agents peuvent avoir été déposés par incorporation de la solution de remouillage, décrite plus loin, les contenant et être restés après évaporation de la solution. Des agents antifalsification ou d'authentification sont bien connus de l'homme de l'art dans le domaine des papiers fiduciaires et de sécurité.According to the present invention, the paper can present, in the said zone or zones, agents chosen from coloring agents, fluorescent agents, fluorescence inhibiting agents, agents allowing recognition or authentication. These agents may have been deposited by incorporating the re-wetting solution, described below, containing them and may have remained after evaporation of the solution. Anti-forgery or authentication agents are well known to those skilled in the art in the field of fiduciary and security papers.
Selon l'invention, le papier peut comporter deux ou plusieurs jets fibreux. Selon une variante, seul l'un des jets de surface présente une réduction d'épaisseur et/ou une différence de nuance et/ou de luminosité dans la ou lesdites zones par rapport au reste du papier multijet.According to the invention, the paper can comprise two or more fibrous jets. According to a variant, only one of the surface jets has a reduction in thickness and / or a difference in shade and / or brightness in the said zone or zones relative to the rest of the multi-jet paper.
Selon l'invention, le papier peut comporter deux ou plusieurs feuilles de papier contrecollées. Selon une variante, la colle de contrecollage est colorée. Dans un mode de réalisation seule une feuille du papier contrecollé présente une réduction d'épaisseur et/ou une différence de nuance et/ou une différence de luminosité dans la ou lesdites zones par rapport au reste du papier contrecollé.According to the invention, the paper can comprise two or more sheets of laminated paper. According to a variant, the lamination adhesive is colored. In one embodiment only one sheet of the laminated paper has a reduction in thickness and / or a difference in shade and / or difference in brightness in the said zone or zones relative to the rest of the laminated paper.
La présente invention fournit aussi un procédé de fabrication d'un papier non couché présentant au moins une marque ressemblant à un filigrane tel que décrit précédemment, caractérisé en ce qu'on réalise ladite marque après l'étape de séchage du papier, ou notamment hors ligne de fabrication du papier, en effectuant les étapes dans lesquelles : a) on applique une solution de remouillage sur au moins une face du papier non couché, dans une ou des zone(s) déterminée(s) puis, b) on applique une pression et une chaleur dans la ou lesdites zones du papier non couché remouillé de manière à évaporer ladite solution et densifier le papier non couché dans la ou lesdites zones par rapport au reste du papier. Selon la présente invention par « papier non couché » on entend que le papier n'est pas revêtu d'une couche pigmentée comprenant au moins des pigments fins minéraux notamment du kaolin et/ou du carbonate de calcium, et au moins un liant ou adhésif, notamment de l'amidon ou du latex, ainsi que, éventuellement, tous additifs couramment employés par l'homme de l'art dont la fonction est d'améliorer les propriétés rhéologiques de la sauce et de conférer des propriétés particulières à la couche.The present invention also provides a method of manufacturing an uncoated paper having at least one mark resembling a watermark as described above, characterized in that said mark is produced after the step of drying the paper, or in particular outside papermaking line, by carrying out the steps in which: a) a rewetting solution is applied to at least one face of the uncoated paper, in one or more determined zone (s) then, b) a pressure and heat in said area (s) of rewetted uncoated paper so as to evaporate said solution and densify uncoated paper in said area (s) relative to the rest of the paper. According to the present invention, “uncoated paper” means that the paper is not coated with a pigmented layer comprising at least fine mineral pigments, in particular kaolin and / or calcium carbonate, and at least one binder or adhesive. , in particular starch or latex, as well as, optionally, any additives commonly used by those skilled in the art, the function of which is to improve the rheological properties of the sauce and to confer particular properties on the layer.
En revanche, le papier peut être imprégné ou traité en surface avec une composition non pigmentée telle qu'une composition d'encollage, notamment pour améliorer son imprimabilité, et/ou sa résistance mécanique et/ou sa résistance à la salissure et/ou ses propriétés bactéricide.On the other hand, the paper can be impregnated or surface treated with a non-pigmented composition such as a sizing composition, in particular to improve its printability, and / or its mechanical resistance and / or its resistance to soiling and / or its bactericidal properties.
Selon la présente invention par « papier remouillé » on entend que, dans la ou lesdites zones, la solution de remouillage a pénétré à l'intérieur du papier et n'est pas encore évaporée. Selon la présente invention, en exerçant une pression sur toute la feuille de papier non couché ou seulement sur lesdites zones et en augmentant la température du papier, ladite solution de remouillage est évaporée et le papier est densifié dans les zones où ladite solution a été initialement appliquée. Il en résulte une augmentation de la masse volumique du papier dans lesdites zones par rapport au reste de la feuille de papier et plus précisément une réduction d'épaisseur avec une masse surfacique identique à celle du reste du papier. Lesdites zones peuvent présenter alors un contraste d'opacité (réduction d'opacité) et/ou un contraste de couleur notamment de nuance de couleur et de luminosité avec le reste de la feuille de papier. L'opacité du papier est en partie liée à la présence d'air dans les interstices fibreux et/ou pigmentaires du papier. Lors de l'étape de remouillage, la solution remplace l'air dans lesdits interstices. Puis lors de l'étape (b), la solution est évaporée et les fibres et/ou les pigments étant densifiés, les interstices d'air occupent globalement un volume réduit et notamment se retrouvent en quantité plus faible qu'initialement, ce qui engendre une désopacification. II convient de relever que, de façon originale, dans le procédé selon l'invention, la densification du papier provient d'une réduction d'épaisseur des zones traitées par rapport au reste du papier, la masse surfacique restant constante par rapport au reste du papier. Au contraire, dans un filigrane « véritable » la masse surfacique est moindre dans les zones claires car les fibres déposées sont en quantité plus faible par rapport au reste de la feuille. Dans le pseudo-filigrane décrit dans WO 97/17493, la masse surfacique n'est pas constante car le poids de la couche est réduit dans certaines zones.According to the present invention, by "rewetted paper" is meant that, in the said zone or zones, the rewetting solution has penetrated inside the paper and has not yet evaporated. According to the present invention, by exerting pressure on the whole sheet of uncoated paper or only on said areas and by increasing the temperature of the paper, said rewetting solution is evaporated and the paper is densified in the areas where said solution was initially applied. This results in an increase in the density of the paper in said zones relative to the rest of the sheet of paper and more precisely a reduction in thickness with a surface mass identical to that of the rest of the paper. Said zones can then present an opacity contrast (reduction of opacity) and / or a color contrast, in particular of color nuance and brightness with the rest of the sheet of paper. The opacity of the paper is partly linked to the presence of air in the fibrous and / or pigmented interstices of the paper. During the rewetting step, the solution replaces the air in said interstices. Then during step (b), the solution is evaporated and the fibers and / or pigments being densified, the air interstices generally occupy a reduced volume and in particular are found in a smaller quantity than initially, which generates deopacification. It should be noted that, in an original manner, in the process according to the invention, the densification of the paper comes from a reduction in thickness of the areas treated relative to the rest of the paper, the surface mass remaining constant relative to the rest of the paper. On the contrary, in a "real" watermark the surface mass is less in the light areas because the fibers deposited are in smaller quantity compared to the rest of the sheet. In the pseudo-watermark described in WO 97/17493, the surface mass is not constant because the weight of the layer is reduced in certain areas.
Le remouillage du papier facilite le réarrangement des fibres et/ou des pigments lors du calandrage. Il peut y avoir des additifs dans la solution de remouillage qui facilitent le réarrangement des fibres et/ou des pigments et/ou qui favorisent la plus ou moins grande pénétration de ladite solution dans le papier.Rewetting the paper makes it easier to rearrange the fibers and / or pigments during calendering. There may be additives in the rewetting solution which facilitate the rearrangement of the fibers and / or pigments and / or which promote the greater or lesser penetration of said solution into the paper.
Le procédé de la présente invention peut également créer une modification de la couleur du papier dans la ou lesdites zones lorsque ladite solution de remouillage comprend un agent colorant notamment un agent colorant de nuançage. Cependant dans le cas d'un papier multijet, notamment bijet, le contraste de couleur dans la ou lesdites zones peut également résulter de la modification de l'opacité dans l'un des jets de surface lorsqu'il existe un écart de nuance initialement entre cedit jet de surface et le jet qui lui est Hé.The method of the present invention can also create a change in the color of the paper in the said zone or zones when said re-wetting solution comprises a coloring agent, in particular a tinting coloring agent. However in the case of a multijet paper, in particular bijet, the color contrast in the said zone or zones can also result from the modification of the opacity in one of the surface jets when there is a difference in shade initially between said surface jet and the jet which is Hey.
Le procédé selon la présente invention s'applique à tous papiers non couchés, blancs ou colorés, sans limitation de grammage, éventuellement contrecollés ou multijets.The method according to the present invention is applicable to all uncoated, white or colored papers, without limitation of grammage, possibly laminated or multijet.
Dans un mode de réalisation préféré à l'étape (b), on applique ladite pression et ladite chaleur en effectuant un calandrage du papier.In a preferred embodiment in step (b), said pressure and said heat are applied by calendering the paper.
Les rouleaux de la calandre peuvent être chauffés mais en tout état de cause le frottement produit par la calandre génère de la chaleur.The calender rollers can be heated, but in any event the friction produced by the calender generates heat.
L'opération de calandrage est réalisée selon la présente invention avec des calandres connues de l'homme de l'art. De manière générale, les calandres peuvent être du type supercalandre, calandre molleThe calendering operation is carried out according to the present invention with calenders known to those skilled in the art. In general, the calenders can be of the supercalender, soft calender type.
(appelée aussi élastique) ou lisse. Elles sont constituées de plusieurs rouleaux dont le nombre et la nature du matériau les constituant varient selon le but recherché et le papier à traiter. Le but est d'aplanir les surfaces des papiers, par compression plus ou moins forte de la feuille entre les rouleaux et par l'étendue plus ou moins grande de la zone de contact entre les rouleaux et la feuille, afin de leur conférer un certain « lissé » ainsi qu'une certaine douceur au toucher et une bonne aptitude à l'écriture et à l'impression. Les crêtes et reliefs sont aplanis plus ou moins fortement au moment du passage entre les rouleaux et la feuille est densifiée. Le but du calandrage peut être également de rendre les surfaces brillantes ou satinées.(also called elastic) or smooth. They consist of several rollers, the number and nature of the material constituting them vary depending on the purpose and the paper to be treated. The goal is to flatten the paper surfaces, by more or less strong compression of the sheet between the rollers and by the greater or lesser extent of the contact zone between the rollers and the sheet, in order to give them a certain “smoothness” as well as a certain softness to the touch and a good writing ability and at printing. The ridges and reliefs are more or less flattened when passing between the rollers and the sheet is densified. The purpose of calendering can also be to make surfaces shiny or satin.
Les rouleaux des calandres sont en fonte trempée ou en acier dont certains peuvent être recouverts d'un tissu, d'un carton ou d'une matière plastique par exemple pour faire des rouleaux élastiques. La supercalandre, qui comporte un grand nombre de rouleaux (de l'ordre de 12 ou plus) est souvent située hors machine à cause de l'entretien, du changement des rouleaux et des ruptures de feuille. La calandre molle peut être située sur la machine à papier, le nombre de rouleaux est plus faible et certains sont élastiques. La lisse est située sur machine et comporte quelques rouleaux souvent en acier et ne sont pas recouverts. La pression linéaire exercée entre les rouleaux sur le papier est de l'ordre de 0,5 à 5000 kN/cm. La température des rouleaux lorsqu'ils sont chauffés peut être de 50 à 300°C.The calender rollers are made of hardened cast iron or steel, some of which can be covered with a fabric, cardboard or plastic for example to make elastic rollers. The supercalender, which has a large number of rollers (of the order of 12 or more), is often located outside the machine due to maintenance, changing of the rollers and sheet breaks. The soft grille can be located on the paper machine, the number of rollers is lower and some are elastic. The boom is located on a machine and has a few rollers, often made of steel, and is not covered. The linear pressure exerted between the rollers on the paper is of the order of 0.5 to 5000 kN / cm. The temperature of the rollers when heated can be 50 to 300 ° C.
Selon la présente invention, pour un équipement donné, les différents paramètres du calandrage tels que la température, la dureté des rouleaux, le revêtement éventuellement des rouleaux, l'étendue de la zone de contact entre les rouleaux et la feuille ainsi que la pression sont choisis en fonction de la nature du contraste final désiré. Ces différents paramètres sont adaptés en fonction de la vitesse de calandrage, elle-même commandée par la vitesse d'application de la solution de remouillage. De préférence, on utilise une calandre comportant 2 à 6 rouleaux et le cas échéant avec un revêtement en plastique (pour son imperméabilité à la solution de remouillage).According to the present invention, for a given piece of equipment, the different calendering parameters such as the temperature, the hardness of the rollers, the coating, if any, of the rollers, the extent of the contact area between the rollers and the sheet as well as the pressure are chosen according to the nature of the desired final contrast. These different parameters are adapted as a function of the calendering speed, itself controlled by the speed of application of the rewetting solution. Preferably, a calender comprising 2 to 6 rollers and if necessary with a plastic coating (for its impermeability to rewetting solution) is used.
Selon la présente invention, la marque peut correspondre à la ou lesdites zones et constituer un motif donné apparaissant par contraste en positif par rapport au reste de la feuille de papier non remouillé. Inversement, le motif donné peut apparaître par contraste en négatif dans la mesure où la marque correspondrait audit reste de la feuille de papier non traité, c'est à dire non remouillé initialement. En particulier, la ou lesdites zones peuvent définir un motif visuel en observation en lumière transmise résultant d'une réduction d'opacité dans la ou lesdites zones. La ou lesdites zones peuvent aussi définir un motif visuel par observation en lumière réfléchie résultant d'une différence de couleur de la ou lesdites zones.According to the present invention, the mark may correspond to the said zone or zones and constitute a given pattern appearing in positive contrast with respect to the rest of the sheet of non-rewetted paper. Conversely, the given pattern may appear as a negative contrast in so far as the mark corresponds to said remainder of the sheet of untreated paper, that is to say not rewetted initially. In particular, the said zone or zones may define a visual pattern under observation in transmitted light resulting from a reduction in opacity in the said zone or zones. The said zone or zones can also define a visual pattern by observation in reflected light resulting from a difference in color of the said zone or zones.
De préférence, ladite marque correspond à la ou lesdites zones traitées. De préférence, pour satisfaire aux objectifs de volume des marchés sur mesure, l'étape (a) est réalisée sur le papier hors ligne de fabrication, c'est à dire sur le papier fini.Preferably, said mark corresponds to the said area or areas treated. Preferably, in order to meet the volume objectives of the tailor-made markets, step (a) is carried out on off-line production paper, that is to say on finished paper.
A l'étape a), la solution de remouillage selon l'invention peut être appliquée à l'aide d'un dispositif héliographique comportant un cylindre d'héliogravure dont les empreintes ou alvéoles en creux, ont une forme telle qu'elles permettent d'appliquer ladite solution de remouillage selon un motif correspondant à ladite marque dans la ou lesdites zones.In step a), the rewetting solution according to the invention can be applied using a rotogravure device comprising a rotogravure cylinder whose imprints or hollow cells have a shape such that they allow 'applying said rewetting solution according to a pattern corresponding to said mark in said zone or zones.
De préférence, la solution de remouillage est appliquée à l'aide d'un dispositif du type de ceux utilisés dans les procédés d'impression par jet d'encre notamment les procédés d'impression par jet d'encre sur bobine étant entendu que l'on remplace ladite encre par ladite solution aqueuse de remouillage. Les dispositifs d'impression par jet d'encre notamment les dispositifs d'impression numérique par jet d'encre permettent de créer des marques selon des motifs variés qui peuvent être modifiés rapidement et à moindre coût d'une fabrication à une autre.Preferably, the re-wetting solution is applied using a device of the type of those used in the ink jet printing processes, in particular the ink jet printing processes on a reel, it being understood that the 'said ink is replaced by said aqueous rewetting solution. Ink-jet printing devices, in particular digital ink-jet printing devices, make it possible to create marks in various patterns which can be changed quickly and inexpensively from one production to another.
Ladite solution de remouillage peut comporter avantageusement un agent mouillant de manière à améhorer ou à accélérer la pénétration de la solution dans le papier. Ledit agent mouillant peut être avantageux, en particulier selon les caractéristiques du papier notamment sa porosité et la présence éventuelle ou non dans celui-ci d'un agent mouillant et selon aussi la quantité de la solution de remouillage appliquée. A titre illustratif, on peut appliquer une quantité de 2 à 20 g/m2 de solution de remouillage. Avantageusement, ladite solution de remouillage est une solution d'un solvant polaire hydrophile.Said rewetting solution may advantageously comprise a wetting agent so as to improve or accelerate the penetration of the solution into the paper. Said wetting agent may be advantageous, in particular according to the characteristics of the paper, in particular its porosity and the possible presence or not in the latter of a wetting agent and also according to the amount of re-wetting solution applied. By way of illustration, a quantity of 2 to 20 g / m 2 of rewetting solution can be applied. Advantageously, said rewetting solution is a solution of a hydrophilic polar solvent.
Comme agent mouillant, on peut utiliser notamment l'éthanol ou la 2-pyrrolidone. De préférence, la solution de remouillage est une solution aqueuse, l'usage d'un solvant non aqueux induisant des surcoûts et des risques de pollution. Selon un mode de réalisation particulier, on peut utiliser comme solution de remouillage une solution hydroalcoolique.As wetting agent, it is possible in particular to use ethanol or 2-pyrrolidone. Preferably, the rewetting solution is an aqueous solution, the use of a non-aqueous solvent inducing additional costs and risks of pollution. According to a particular embodiment, a hydroalcoholic solution can be used as rewetting solution.
Plus particulièrement, on peut utiliser une solution aqueuse contenant de 1 à 10% en volume d'éthanol notamment 2%, dans de l'eau, ou une solution aqueuse contenant de 1 à 10 % en poids de 2-pyrrolidone, notamment 2 % dans de l'eau. Dans certains cas, il peut s'avérer possible d'utiliser de l'eau sans agent mouillant comme solution aqueuse de remouillage notamment dans le cas d'un papier très poreux et/ou qui comporte des agents mouillant et/ou des pigments particuliers ayant une grande capacité d'absorption de l'eau dans sa composition, comme certaines silices. Eventuellement la solution de remouillage peut également comporter des additifs tels que des colorants, notamment des colorants de nuançage, des agents fluorescents blanchissants (azurants optiques) ou à l'inverse des agents inhibiteurs de fluorescence ainsi que tous additifs connus de l'homme de l'art pour permettre la reconnaissance ou l'authentification des papiers dits de sécurité. En particulier, la solution de remouillage peut comporter un agent antifalsification ou agent d'authentification incolore susceptible d'être révélé par réaction avec un coréactif déterminé ou dans des conditions particulières.More particularly, an aqueous solution containing from 1 to 10% by volume of ethanol, in particular 2%, in water, or an aqueous solution containing from 1 to 10% by weight of 2-pyrrolidone, in particular 2%, can be used. in water. In some cases, it may be possible to use water without a wetting agent as an aqueous rewetting solution, in particular in the case of a very porous paper and / or which contains wetting agents and / or particular pigments having a great capacity for absorbing water in its composition, like certain silicas. Optionally, the re-wetting solution may also contain additives such as dyes, in particular tinting dyes, fluorescent whitening agents (optical brighteners) or conversely fluorescence inhibiting agents as well as any additives known to those skilled in the art. art to allow the recognition or authentication of so-called security papers. In particular, the re-wetting solution may comprise an antifalsification agent or colorless authentication agent capable of being revealed by reaction with a determined co-reactant or under specific conditions.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lumière des exemples de réalisation qui suivent.Other characteristics and advantages of the present invention will become apparent in the light of the following exemplary embodiments.
CONDITIONS GENERALES DE REALISATION DU PSEUDO-FILIGRANE DES EXEMPLES 1 à 11 :GENERAL CONDITIONS FOR PRODUCING THE PSEUDO-FILIGRANE FROM EXAMPLES 1 to 11:
En simulation des systèmes d'impression numérique par jet d'encre sur bobine, on utilise une imprimante de bureau Hewlett Packard Deskjet 560 C munie d'une cartouche référence 51626A préalablement vidée de son encre, nettoyée puis remplie d'une solution de remouillage constituée d'eau distillée et de 2% volume d'éthanol, afin de remouiller les papiers ci-après. Dans ces exemples, les marques sont en positif , sauf précision particulière, et la quantité de solution de remouillage apportée, pour un aplat remouillé avec une résolution de 600 x 300 points par pouce, et les conditions de tramage dit « gros grain », de qualité dite « courrier » et de contrôle d'intensité dit « normal », est de l'ordre de 12 g/m2.In simulation of digital inkjet printing systems on a reel, a Hewlett Packard Deskjet 560 C desktop printer is used fitted with a cartridge reference 51626A previously emptied of its ink, cleaned then filled with a rewetting solution consisting distilled water and 2% volume of ethanol, in order to rewet the papers below. In these examples, the marks are in positive, unless otherwise specified, and the amount of rewetting solution provided, for a rewetted solid with a resolution of 600 × 300 dots per inch, and the so-called “coarse” screening conditions, so-called “mail” and so-called “normal” intensity control quality is around 12 g / m2.
Les papiers aussitôt remouillés sont passés dans une calandre de laboratoire à deux rouleaux chauffés à 50°C, sous une pression linéaire de 3,0 kN/cm.The papers, immediately rewetted, are passed through a laboratory calender with two rollers heated to 50 ° C, under a linear pressure of 3.0 kN / cm.
EXEMPLE 1 : CONTRASTE D'OPACITE Sur une feuille de papier blanc non couché de 80 g/m2 de format A4, commercialisé sous la marque RG® de la société GUERIMAND S.A., on représente par remouillage et calandrage selon les conditions données ci-dessus, un motif qui est un personnage tenant à la main un parapluie fermé, à l'aide du logiciel POWER POINT ® de MICROSOFT. On obtient un papier présentant des marques selon le motif semblable à un filigrane ombré translucide. La réduction d'épaisseur variable dans la zone traitée peut aller jusqu'à 40% par rapport au reste du papier. EXEMPLE 2 : CONTRASTE D'OPACITEEXAMPLE 1: OPACITY CONTRAST On a sheet of uncoated white paper of 80 g / m 2 in A4 format, marketed under the brand RG® of the company GUERIMAND SA, it is represented by rewetting and calendering according to the conditions given above. , a motif which is a character holding a closed umbrella in his hand, using MICROSOFT POWER POINT ® software. We obtain a paper with marks according to the pattern similar to a translucent shaded watermark. The variable thickness reduction in the treated area can be up to 40% compared to the rest of the paper. EXAMPLE 2: OPACITY CONTRAST
Sur une feuille de papier blanc non couché de 80 g/m2 de format A4, commercialisé sous la marque RG® de la société GUERIMAND S.A., on représente par remouillage et calandrage selon les conditions données ci-dessus, un motif marbré, à l'aide du logiciel POWER POINT ® de MICROSOFT. On obtient un papier présentant des marques selon le motif semblable à un filigrane ombré translucide. La réduction d'épaisseur variable dans la zone traitée peut aller jusqu'à 40% par rapport au reste du papier.On a sheet of uncoated white paper of 80 g / m 2 in A4 format, marketed under the brand RG® of the company GUERIMAND SA, a marbled pattern is represented by rewetting and calendering according to the conditions given above. using POWER POINT ® software from MICROSOFT. We obtain a paper with marks according to the pattern similar to a translucent shaded watermark. The variable thickness reduction in the treated area can be up to 40% compared to the rest of the paper.
EXEMPLE 3 : CONTRASTE D'OPACITE ET ECART DE COULEUR (NUANCE ET LUMINOSITE)EXAMPLE 3: OPACITY CONTRAST AND COLOR GAP (SHADE AND BRIGHTNESS)
Sur une feuille de papier de couleur jaune non couché de 80 g/m2 de format A4, commercialisé sous la marque POPSET ® de la société ARJO WIGGINS S.A., on représente par remouillage et calandrage selon les conditions données ci-dessus, le motif du personnage tenant à la main un parapluie fermé, à l'aide du logiciel POWER POINT ® de MICROSOFT. On obtient un papier présentant des marques selon le motif semblable à un filigrane .ombré translucide. L'écart de couleur ΔE* (selon les coordonnées colorimétriques du système CIELAB 1976) est de 5,97. La réduction d'épaisseur variable dans la zone traitée peut aller jusqu'à 40%o par rapport au reste du papier.On a sheet of uncoated yellow paper of 80 g / m 2 in A4 format, marketed under the brand POPSET ® of the company ARJO WIGGINS SA, the pattern of the re-wetting and calendering is represented according to the conditions given above. character holding a closed umbrella in his hand, using MICROSOFT POWER POINT ® software. We obtain a paper with marks according to the pattern similar to a translucent shadow watermark. The color difference ΔE * (according to the color coordinates of the CIELAB 1976 system) is 5.97. The variable thickness reduction in the treated area can be up to 40% o compared to the rest of the paper.
EXEMPLE 4 :EXAMPLE 4:
Sur un échantillon de papier blanc non couché de 115 g/m2 satiné, donc déjà calandre, on reproduit à deux endroits différents, le motif selon une photographie d'identité d'une personne, selon les conditions générales mentionnées ci-avant, cependant pour l'une des reproductions (a), on- a réalisé par remouillage les parties sombres de la photographie, et pour l'autre reproduction (b), on a réalisé par remouillage les parties claires de la photographie, apparaissant ainsi en négatif. Après calandrage et séchage, le papier ainsi obtenu est un papier de sécurité personnalisé par le double pseudo-filigrane de la photographie d'identité que l'on reconnaît Par vision directe, en lumière réfléchie, sous forme de contraste de nuance, on observe (a). Par observation en lumière transmise, on observe (b) sous forme de contraste d'opacité (zones remouillées devenues moins opaques et donc plus claires), étant compris qu'à l'inverse, (a) en lumière transmise et (b) en vision directe en lumière réfléchie sont chacune perçue comme une empreinte du négatif de la photographie d'identité.On a sample of uncoated white paper of 115 g / m 2 satin, therefore already calendered, the motif is reproduced in two different places, according to an identity photograph of a person, according to the general conditions mentioned above, however for one of the reproductions (a), the dark parts of the photograph were made by rewetting, and for the other reproduction (b), the light portions of the photograph were rewetted, thus appearing in negative. After calendering and drying, the paper thus obtained is a security paper personalized by the double pseudo-watermark of identity photography which is recognized By direct vision, in reflected light, in the form of shade contrast, we observe ( at). By observation in transmitted light, we observe (b) in the form of opacity contrast (rewetted areas become less opaque and therefore brighter), being understood that conversely, (a) in transmitted light and (b) in direct vision in reflected light are each perceived as an imprint of the negative of identity photography.
EXEMPLE 5 : On réalise un papier bijet non couché de 170 g/m2sur une formette de laboratoire. L'un des jets est de couleur blanche et a un grammage de 90 g/m2 et l'autre jet est de nuance verte et a aussi un grammage de 80 g/m2 EXAMPLE 5 An uncoated 170 g / m 2 bijet paper is produced on a laboratory form. One of the jets is white and has a grammage of 90 g / m 2 and the other jet is of green shade and also has a grammage of 80 g / m 2
Après séchage du papier bijet, sur la face du jet blanc, on représente par remouillage et calandrage selon les conditions générales mentionnées ci-avant, le motif du personnage tenant à la main un parapluie fermé, à 1 ' aide du logiciel POWER POINT ® de MICROSOFT. On obtient un papier présentant des marques selon le motif apparaissant en lumière transmise semblable à un filigrane ombré translucide et nuancé. En vision directe en lumière réfléchie, on observe le motif du fait de la nuance verte du jet en dessous le motif. Le jet blanc étant assez épais, la solution de remouillage n'a pas pénétré dans le jet vert.After drying the bijet paper, on the face of the white jet, the reworking and calendering according to the general conditions mentioned above, represents the motif of the character holding in his hand a closed umbrella, using the POWER POINT ® software from MICROSOFT. We obtain a paper with marks according to the pattern appearing in transmitted light similar to a translucent and nuanced shaded watermark. In direct vision in reflected light, the pattern is observed because of the green shade of the jet below the pattern. The white spray being quite thick, the rewetting solution did not penetrate the green spray.
EXEMPLE 6 :EXAMPLE 6
On réalise un papier contrecollé non couché de 210 g/m2 en contrecollant deux papiers non couchés de couleur blanche ayant un grammage de 90 g/m2 à l'aide d'une colle à base de poly (acétate de vinyle) et comportant 3 % en poids d'un colorant de nuançage, le VIOLET BB 200%.An uncoated laminated paper of 210 g / m 2 is produced by laminating two uncoated white papers having a basis weight of 90 g / m 2 using an adhesive based on poly (vinyl acetate) and comprising 3% by weight of a shading dye, VIOLET BB 200%.
Sur l'une des faces, on représente par remouillage et calandrage selon les conditions générales données ci-avant, le motif du personnage tenant à la main un parapluie fermé, à l'aide du logiciel POWER POINT ® de MICROSOFT. On obtient un papier présentant des marques selon le motif apparaissant en lumière transmise semblable à un filigrane ombré translucide et nuancé. En vision directe en lumière réfléchie, on observe le motif du fait de la nuance de la colle de contrecollage. La solution de remouillage n'a pas pénétré dans tout le papier du fait de la présence de la colle.On one of the faces, the reworking and calendering according to the general conditions given above, represents the motif of the character holding in his hand a closed umbrella, using the POWER POINT ® software from MICROSOFT. We obtain a paper with marks according to the pattern appearing in transmitted light similar to a translucent and nuanced shaded watermark. In direct vision in reflected light, the pattern is observed due to the nuance of the lamination glue. The rewetting solution did not penetrate all of the paper due to the presence of glue.
EXEMPLES 7 et 8 : CONTRASTE DE COULEUREXAMPLES 7 and 8: COLOR CONTRAST
Exemple 7 :Example 7:
A la solution de remouillage décrite précédente eau -éthanol , on ajoute 0,01 % en poids d'une poudre d'un colorant de nuançage , le VIOLET BB 200%>.To the rewetting solution described above, water-ethanol, 0.01% is added. weight of a powder of a shading dye, VIOLET BB 200%>.
Sur une feuille de papier blanc non couché de 80 g/m2 de format A4, commercialisé sous la marque RG® de la société GUERIMAND, on représente par remouillage et calandrage selon les conditions données ci-dessus, un motif qui est un personnage tenant à la main un parapluie fermé, à l'aide du logiciel POWER POINT ® de MICROSOFT. On obtient un papier présentant des marques selon le motif semblable à un filigrane translucide visible en lumière transmise. Le motif est également visible en lumière réfléchie grâce à sa nuance violette. Exemple 8 : A la solution de remouillage décrite précédente eau -éthanol , on n'ajoute que 0,005On a sheet of uncoated white paper of 80 g / m 2 in A4 format, marketed under the brand RG® of the company GUERIMAND, a pattern which is a character holding is represented by rewetting and calendering according to the conditions given above by hand a closed umbrella, using MICROSOFT POWER POINT ® software. We obtain a paper with marks according to the pattern similar to a translucent watermark visible in transmitted light. The pattern is also visible in reflected light thanks to its purple shade. Example 8: To the rewetting solution described above water-ethanol, only 0.005 is added
% en poids d'une poudre d'un colorant de nuançage , le VIOLET BB 200%,% by weight of a powder of a shading dye, VIOLET BB 200%,
On réalise le pseudofiligrane comme à l'exemple 7. On obtient un papier présentant des marques selon le motif semblable à un filigrane translucide mais il a un meilleure visibilité en lumière transmise, du fait que la quantité de colorant est moindre que pour celui de l'exemple 7. On observe aussi le motif en lumière réfléchie grâce à sa nuance violette.The pseudofiligrane is produced as in Example 7. A paper is obtained having marks according to the pattern similar to a translucent watermark but it has better visibility in transmitted light, since the amount of dye is less than that of the 'example 7. We also observe the pattern in reflected light thanks to its purple shade.
EXEMPLE 9 : REACTION D 'INFALSIFICATION COLOREEEXAMPLE 9: COLORED INFALSIFICATION REACTION
A la solution de remouillage décrite dans les conditions générales eau -éthanol , on ajoute 4 % en poids d'un colorant d' infalsification, le colorant appelé jaune DHTD , qui passse de incolore à jaune-marron sous l'action de l'hypochlorite de sodium.To the rewetting solution described in the general conditions of water-ethanol, 4% by weight of a dye for forging is added, the dye called yellow DHTD, which changes from colorless to yellow-brown under the action of hypochlorite. sodium.
Sur une feuille de papier blanc non couché de 80 g/m2 de format A4, commercialisé sous la marque RG® de la société GUERIMAND S. A., on représente par remouillage et calandrage selon les conditions données ci-dessus, un mot et un dessin, à l'aide du logiciel POWER POINT ® de MICROSOFT. On obtient un papier présentant des marques non colorées selon le motif semblable à un filigrane translucide visible en lumière fransmise. Si on applique de l'hypochlorite de sodium (eau de javel) comme agent de falsification, il se développe une couleur jaune-marron au niveau des marques qui met en évidence la tentative de falsification.On a sheet of uncoated white paper of 80 g / m 2 in A4 format, marketed under the brand RG® of the company GUERIMAND SA, a word and a drawing are represented by rewetting and calendering, using MICROSOFT POWER POINT ® software. One obtains a paper having non-colored marks according to the pattern similar to a translucent watermark visible in emitted light. If sodium hypochlorite (bleach) is applied as a falsifying agent, a yellow-brown color develops at the marks which highlights the attempt at falsification.
EXEMPLE 10 : CONTRASTE D'OPACITE ET DE FLUORESCENCEEXAMPLE 10: OPACITY AND FLUORESCENCE CONTRAST
A la solution de remouillage eau -éthanol décrite dans les conditions générales, on ajoute 2 % d'un agent fluorescent blanchissant commercialisé sous la marque Blancophor ® BSU PN.To the water-ethanol rewetting solution described in the general conditions, 2% of a whitening fluorescent agent sold under the brand Blancophor is added. ® BSU PN.
Sur un échantillon de papier velin non couché de 80 g/m2, fabriqué à partir de fibres de coton et ne contenant pas d'agent fluorescent blanchissant, on représente par remouillage et calandrage selon les conditions générales mentionnées ci-avant, le motif du personnage tenant à la main un parapluie fermé. On obtient un papier présentant des marques non colorées selon le motif semblable à un filigrane translucide visible en lumière transmise par contraste d'opacité et qui, en vision directe en lumière réfléchie, est plus ou moins révélé par contraste de nuance et de fluorescence selon que la lumière incidente d'observation, naturelle ou artificielle, comporte plus ou moins de rayonnement ultra- violet.On a sample of uncoated vellum paper of 80 g / m 2 , made from cotton fibers and containing no whitening fluorescent agent, the pattern of the rewetting and calendering is represented according to the general conditions mentioned above. character holding a closed umbrella in his hand. One obtains a paper having non-colored marks according to the pattern similar to a translucent watermark visible in light transmitted by contrast of opacity and which, in direct vision in reflected light, is more or less revealed by contrast of shade and fluorescence depending on whether incident light, natural or artificial, contains more or less ultraviolet radiation.
EXEMPLE 11 :EXAMPLE 11:
La solution de remouillage est constituée d'eau distillée et de 2 % en poids de 2- pyrrolidone (pureté 98 %). Après calandrage à 50° C d'un papier similaire à celui de l'exemple 3, sous une pression linéaire de 1,0 kN/cm, on obtient un papier avec un pseudo-filigrane conformément à l'invention, par contraste de nuance et opacité.The rewetting solution consists of distilled water and 2% by weight of 2-pyrrolidone (98% purity). After calendering at 50 ° C a paper similar to that of Example 3, under a linear pressure of 1.0 kN / cm, a paper is obtained with a pseudo-watermark according to the invention, by shade contrast and opacity.
EXEMPLE 12 : Sur une calandre molle de faible laize, une tête d'impression d'imprimante jet d'encreEXAMPLE 12: On a soft grille with a small width, an inkjet printer printhead
SCITEX 6240, a été installée à un mètre des rouleaux de la calandre. L'impression et la vitesse de calandrage sont synchronisées. Comme solution de remouillage du papier, on utilise un mélange d'eau déminéralisée et de 5% en volume d'éthanol. La calandre est composée de deux rouleaux; l'un est en acier et le contre-rouleau a un habillage en plastique. Ces rouleaux sont chauffés à 80°C et la pression linéaire entre les rouleaux est de 2,5 kN/cm. On déroule la bobine d'une feuille de papier blanc, on réalise un motif avec la solution de remouillage à l'aide de la tête d'impression sur la feuille, puis on fait passer ladite feuille entre les deux rouleaux de la calandre. La vitesse de défilement de la feuille de papier est de 20 m/mn. La feuille de papier sec a une épaisseur de 60 μm et a été densifiée dans les zones de remouillage par une réduction d'épaisseur de 16 μm. On obtient un papier avec un pseudofiligrane conformément à l'invention, par réduction d'épaisseur. SCITEX 6240, was installed one meter from the calender rollers. Printing and calendering speed are synchronized. As a rewetting solution for the paper, a mixture of demineralized water and 5% by volume of ethanol is used. The grille consists of two rollers; one is made of steel and the counter roller has a plastic covering. These rollers are heated to 80 ° C and the linear pressure between the rollers is 2.5 kN / cm. The reel is unwound from a sheet of white paper, a pattern is made with the rewetting solution using the print head on the sheet, then the said sheet is passed between the two rollers of the calender. The running speed of the paper sheet is 20 m / min. The dry paper sheet has a thickness of 60 μm and has been densified in the rewetting zones by a thickness reduction of 16 μm. A paper is obtained with a pseudofiligrane according to the invention, by reduction of thickness.

Claims

REVENDICATIONS
1. Papier non couché comportant au moins une marque ressemblant à un filigrane, caractérisé en ce qu'une ou des zones déterminées du papier non couché présentent une réduction d'épaisseur par rapport au reste du papier non couché, la masse surfacique dans la ou lesdites zones du papier étant identique à celle du reste du papier.1. Uncoated paper comprising at least one mark resembling a watermark, characterized in that one or more determined zones of the uncoated paper have a reduction in thickness compared to the rest of the uncoated paper, the surface mass in the or said areas of the paper being identical to that of the rest of the paper.
2. Papier non couché selon la revendication 1, caractérisé en ce que la ou lesdites zones présentent une réduction d'opacité par rapport au reste du papier.2. Uncoated paper according to claim 1, characterized in that the said zone or zones have a reduction in opacity compared to the rest of the paper.
3. Papier non couché selon l'une des revendications 1 à 2, caractérisé en ce que la ou lesdites zones présentent une couleur, et notamment une nuance et/ou une luminosité, différente de celle du reste du papier.3. Uncoated paper according to one of claims 1 to 2, characterized in that the said zone or zones have a color, and in particular a shade and / or a brightness, different from that of the rest of the paper.
4. Papier non couché selon l'une des revendications 1 à 3, caractérisé en ce qu'il présente une réduction d'épaisseur et d'opacité dans la ou lesdites zones par rapport au reste du papier.4. Uncoated paper according to one of claims 1 to 3, characterized in that it has a reduction in thickness and opacity in the said zone or zones relative to the rest of the paper.
5. Papier non couché selon l'une des revendications 1 à 4, caractérisé en ce que la ou desdites zones comportent des agents choisis parmi des agents colorants, des agents fluorescents, des agents inhibiteurs de fluorescence, des agents antifalsification ou d'authentification.5. Uncoated paper according to one of claims 1 to 4, characterized in that the said zone or zones comprise agents chosen from coloring agents, fluorescent agents, fluorescence inhibiting agents, antifalsification or authentication agents.
6. Papier non couché selon l'une des revendications 1 à 5, caractérisé en ce qu'il comporte deux ou plusieurs jets fibreux.6. Uncoated paper according to one of claims 1 to 5, characterized in that it comprises two or more fibrous jets.
7. Papier non couché selon la revendication précédente, caractérisé en ce que seul l'un des jets de surface présente une réduction d'épaisseur et/ou une différence de nuance et/ou de luminosité dans la ou lesdites zones par rapport au reste du papier multijet.7. Uncoated paper according to the preceding claim, characterized in that only one of the surface jets has a reduction in thickness and / or a difference in shade and / or brightness in the said zone or zones with respect to the rest of the multijet paper.
8. Papier non couché selon l'une des revendications 1 à 7, caractérisé en ce qu'il comporte deux ou plusieurs feuilles de papier contrecollées. 8. Uncoated paper according to one of claims 1 to 7, characterized in that it comprises two or more sheets of laminated paper.
9. Papier non couché selon la revendication précédente, caractérisé en ce que la colle de confrecollage est colorée.9. Uncoated paper according to the preceding claim, characterized in that the adhesive glue is colored.
10. Papier selon la revendication 8 ou 9, caractérisé en ce que seule l'une des feuilles du papier confrecollé présente une réduction d'épaisseur et/ou une différence de nuance et/ou une différence de luminosité dans la ou lesdites zones par rapport au reste du papier confrecollé.10. Paper according to claim 8 or 9, characterized in that only one of the sheets of the laminated paper has a reduction in thickness and / or a difference in shade and / or a difference in brightness in the said zone or zones with respect to to the rest of the laminated paper.
11. Procédé de fabrication d'un papier non couché, comportant au moins une marque ressemblant à un filigrane selon l'une des revendications 1 à 10, caractérisé en ce qu'on réalise ladite marque après l'étape de séchage du papier, en effectuant les étapes dans lesquelles : a) on applique une solution de remouillage sur au moins une face du papier non couché, dans une ou des zones déterminées, puis b) on applique une pression et une chaleur dans la ou lesdites zones du papier non couché remouillé de manière à évaporer ladite solution et densifier le papier non couché dans la ou lesdites zones par rapport au reste du papier.11. A method of manufacturing uncoated paper, comprising at least one mark resembling a watermark according to one of claims 1 to 10, characterized in that said mark is produced after the step of drying the paper, carrying out the steps in which: a) applying a rewetting solution to at least one face of the uncoated paper, in one or more determined zones, then b) applying pressure and heat in the zone or said zones of the uncoated paper rewetted so as to evaporate said solution and densify the uncoated paper in the said zone or zones relative to the rest of the paper.
12. Procédé selon la revendication 11, caractérisé en ce qu'à l'étape a) ladite solution de remouillage est appliquée à l'aide d'un dispositif d'impression par jet d'encre sur papier, notamment un dispositif d'impression numérique par jet d'encre, dans lequel on remplace l'encre par ladite solution de remouillage.12. Method according to claim 11, characterized in that in step a) said rewetting solution is applied using an inkjet printing device on paper, in particular a printing device digital inkjet, in which the ink is replaced by said rewetting solution.
13. Procédé selon la revendication 11 ou 12, caractérisé en ce que à l'étape b) on applique ladite pression et ladite chaleur en effectuant un calandrage du papier non couché.13. The method of claim 11 or 12, characterized in that in step b) said pressure and said heat are applied by calendering the uncoated paper.
14. Procédé selon l'une des revendications 11 à 13, caractérisé en ce que ladite solution de remouillage est une solution aqueuse.14. Method according to one of claims 11 to 13, characterized in that said rewetting solution is an aqueous solution.
15. Procédé selon l'une des revendications 11 à 14, caractérisé en ce que ladite solution de remouillage comporte des additifs choisis parmi des agents mouillants, des agents colorants notamment des agents de nuançage, des agents fluorescents blanchissants, des agents inhibiteurs de fluorescence, des agents antifalsification ou d'authentification. 15. Method according to one of claims 11 to 14, characterized in that said rewetting solution comprises additives chosen from wetting agents, coloring agents in particular shading agents, fluorescent whitening agents, fluorescence inhibiting agents, anti-forgery or authentication agents.
16. Procédé selon la revendication 14, caractérisé en ce que ladite solution aqueuse est une solution hydroalcoolique.16. Method according to claim 14, characterized in that said aqueous solution is an aqueous-alcoholic solution.
17. Procédé selon la revendication 16, caractérisé en ce que ladite solution aqueuse contient de 1 à 10% en volume d'éthanol dans de l'eau.17. The method of claim 16, characterized in that said aqueous solution contains from 1 to 10% by volume of ethanol in water.
18. Procédé selon la revendication 14 ou 15, caractérisé en ce que ladite solution aqueuse contient de 1 à 10 % en poids de 2-pyrrolidone dans de l'eau.18. The method of claim 14 or 15, characterized in that said aqueous solution contains from 1 to 10% by weight of 2-pyrrolidone in water.
19. Procédé selon l'une des revendications 11 à 18, caractérisé en ce que la ou lesdites zones définissent un motif visuel en observation en lumière fransmise résultant d'une réduction d'opacité dans la ou lesdites zones.19. Method according to one of claims 11 to 18, characterized in that the said zone or zones define a visual pattern under observation in scattered light resulting from a reduction in opacity in the said zone or zones.
20. Procédé selon l'une des revendications 11 à 19, caractérisé en ce que la ou lesdites zones définissent un motif visuel en observation en lumière réfléchie résultant d'une différence de couleur dans la ou lesdites zones. 20. Method according to one of claims 11 to 19, characterized in that the said zone or zones define a visual pattern under observation in reflected light resulting from a difference in color in the said zone or zones.
PCT/FR1999/002947 1998-12-01 1999-11-29 Uncoated paper comprising a pseudo-watermark and method for making same WO2000032874A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU13916/00A AU1391600A (en) 1998-12-01 1999-11-29 Uncoated paper comprising a pseudo-watermark and method for making same
EP99973085A EP1135556B1 (en) 1998-12-01 1999-11-29 Uncoated paper comprising a pseudo-watermark and method for making same
BR9915844-2A BR9915844A (en) 1998-12-01 1999-11-29 Non-coated paper, containing a pseudofiligree and manufacturing process
AT99973085T ATE237030T1 (en) 1998-12-01 1999-11-29 UNCOATED PAPER WITH AN IMITATED WATERMARK AND METHOD FOR PRODUCING IT
DE69906789T DE69906789D1 (en) 1998-12-01 1999-11-29 UNPROCESSED PAPER WITH A REPRODUCED WATERMARK, AND METHOD FOR THE PRODUCTION THEREOF

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR98/15183 1998-12-01
FR9815183A FR2786510B1 (en) 1998-12-01 1998-12-01 UNCOATED PAPER HAVING A PSEUDO-FILIGRANE AND MANUFACTURING METHOD

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PCT/FR1999/002947 WO2000032874A1 (en) 1998-12-01 1999-11-29 Uncoated paper comprising a pseudo-watermark and method for making same

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2861101A1 (en) * 2003-10-15 2005-04-22 Arjo Wiggins Multi-web security paper e.g. for banknotes or passports, has outer web with authentification element and inner one with reinforcing element
US8951626B2 (en) 2008-04-07 2015-02-10 Sca Hygiene Products Ab Hygiene or wiping product comprising at least one patterned ply and method for patterning the ply
WO2015197617A1 (en) 2014-06-23 2015-12-30 Arjowiggins Security Security papers and methods of manufacture
WO2016163118A1 (en) * 2015-04-06 2016-10-13 セイコーエプソン株式会社 Sheet manufacturing apparatus and sheet manufacturing method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4824486A (en) * 1985-11-04 1989-04-25 Westvaco Corporation Simulated watermark printing system
WO1997017493A1 (en) * 1995-11-09 1997-05-15 Mo Och Domsjö Ab Surface treated security paper and method and device for producing surface treated security paper
DE29714004U1 (en) * 1997-08-06 1997-11-06 Helmstreit Herbert Means for ink jet printing of artificial watermarks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4824486A (en) * 1985-11-04 1989-04-25 Westvaco Corporation Simulated watermark printing system
WO1997017493A1 (en) * 1995-11-09 1997-05-15 Mo Och Domsjö Ab Surface treated security paper and method and device for producing surface treated security paper
DE29714004U1 (en) * 1997-08-06 1997-11-06 Helmstreit Herbert Means for ink jet printing of artificial watermarks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WALENSKI, W.: "Watermarks and Those That Are Not", DRUCKSPIEGEL 52, NO. 3: 66-68 (MARCH 1997). [GER.], XP002109409 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2861101A1 (en) * 2003-10-15 2005-04-22 Arjo Wiggins Multi-web security paper e.g. for banknotes or passports, has outer web with authentification element and inner one with reinforcing element
WO2005038135A1 (en) * 2003-10-15 2005-04-28 Arjowiggins Multi-layer security paper
US9464385B2 (en) 2003-10-15 2016-10-11 Arjowiggins Security Multi-layer security paper
US8951626B2 (en) 2008-04-07 2015-02-10 Sca Hygiene Products Ab Hygiene or wiping product comprising at least one patterned ply and method for patterning the ply
WO2015197617A1 (en) 2014-06-23 2015-12-30 Arjowiggins Security Security papers and methods of manufacture
WO2016163118A1 (en) * 2015-04-06 2016-10-13 セイコーエプソン株式会社 Sheet manufacturing apparatus and sheet manufacturing method
JPWO2016163118A1 (en) * 2015-04-06 2018-02-01 セイコーエプソン株式会社 Sheet manufacturing apparatus and sheet manufacturing method
US10428466B2 (en) 2015-04-06 2019-10-01 Seiko Epson Corporation Sheet manufacturing apparatus and sheet manufacturing method

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ATE237030T1 (en) 2003-04-15
EP1135556A1 (en) 2001-09-26
DE69906789D1 (en) 2003-05-15
EP1135556B1 (en) 2003-04-09
BR9915844A (en) 2002-01-15
AU1391600A (en) 2000-06-19
FR2786510A1 (en) 2000-06-02
FR2786510B1 (en) 2001-02-16

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