EP1825055B1 - Glossy paper - Google Patents

Glossy paper Download PDF

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Publication number
EP1825055B1
EP1825055B1 EP05824442.7A EP05824442A EP1825055B1 EP 1825055 B1 EP1825055 B1 EP 1825055B1 EP 05824442 A EP05824442 A EP 05824442A EP 1825055 B1 EP1825055 B1 EP 1825055B1
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EP
European Patent Office
Prior art keywords
paper
glossy
scintillating
microbeads
microplatelets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05824442.7A
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German (de)
French (fr)
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EP1825055A1 (en
Inventor
André Honnorat
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Honnorat Recherches and Services
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Honnorat Recherches and Services
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Publication of EP1825055A1 publication Critical patent/EP1825055A1/en
Application granted granted Critical
Publication of EP1825055B1 publication Critical patent/EP1825055B1/en
Not-in-force legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture

Definitions

  • the invention relates to the field of glossy or glittering papers used for the production of magazines, brochures, advertising documents, art papers or papers for printing and writing.
  • Glossy papers are generally obtained by means of a calendering or supercalendering operation of coated papers with an essentially inorganic coating, said calendering operation makes it possible to smooth the surface thoroughly.
  • the gloss is obtained on the coated and calendered paper by the uniform reflection of the light on the extremely smooth and homogeneous surface.
  • the method does not in any way to obtain a textured paper or relief since the method consists in completely leveling the surface.
  • embossed papers correspond, in a non exclusive way, to the papers of the categories printing and writing, texts and covers and fine arts, for which a particular texture of paper is often sought.
  • Paper texture must include papers with watermarks, particular colors, orchards, various markings such as those produced with grain markers or markers, etc ...
  • Another means for producing glossy papers and more particularly said embossed papers is to coat a gloss varnish during a processing operation, out of the paper machine.
  • the gloss is obtained by a high quantity deposit of a glossy polymer.
  • a process similar to that of the varnishing can be performed on a coater with a formulation similar to that of a varnish.
  • Another technique is to laminate the finished paper with a polymer film.
  • the laminating operation carried out outside the paper machine, when the paper is manufactured, is also expensive and corresponds to an application different from that of the invention, rather from the field of the transformation of the printed paper than that of the production. .
  • This composition is coated on a support paper with a coating system equipped with an equalizer air knife.
  • This type of coating system does not equip paper machines. As a result, coating with this coating system is not performed on the paper machine.
  • no component a) to f) of the coating composition comprises microplates or reflective microbeads smaller than 300 microns, integrating at least one optically transparent material in their structure.
  • the invention therefore aims to solve these major difficulties, that is to say manufacture a glossy or scintillating paper economically without calendering or varnishing operation on all paper machines, with or without built-in coater, and with all possible supports, especially colored or textured.
  • the glossy or scintillating paper according to the invention has a roughness greater than 30 ml / min measured according to the ISO 8791-2 standard, it is manufactured completely on a paper machine, and it is characterized by the fact that it comprises microplates or reflective microbeads smaller than 300 ⁇ m integrating at least one optically transparent material into their structure, generally a compound classified in the general family of glasses, for example a borosilicate.
  • the advantages of the paper according to the invention are both economical, since it is possible to manufacture a glossy or scintillating paper without calendering, coating or processing, and at the same time technical because glossy papers as proposed allow to obtain particular optical effects and in particular a remarkable gloss on textured or colored papers with full maintenance of the mechanical characteristics of the paper, in particular as regards rigidity and resistance to bursting.
  • Another remarkable effect of the invention is that the optical rendering of the paper according to the invention is variable according to the ambient lighting at the moment of observation.
  • lighting is important, in the sense of the light reaching the paper, the treatment leads to a uniform gloss effect whereas when the lighting is low scintillated individual points are perceptible on the surface of said paper.
  • the glossy or scintillating treated paper retains all its physical and mechanical characteristics as well as its appearance and touch characteristics, which is decisive in the case of textured papers for which a relief is desired and for which it is often required a pleasant touch, this is more particularly the case for papers incorporating cotton linters in their fibrous composition.
  • Coating, coating or varnishing treatments result in the loss of these appearance properties which are particularly appreciated for fine art papers and most papers used in printing and writing.
  • coated paper any paper having on its surface a coating comprising at least one polymeric binder and optionally inorganic or organic fillers, the operation being carried out on or off the machine. using a coating tool to maintain the layer deposited on the surface of the paper, that is to say that said layer does not penetrate more than 20%, and generally less than 10% of the paper thickness.
  • Uncoated paper is to be understood as a raw paper having either no surface treatment or impregnation or coating by means of various, preferably rolled, devices which force the penetration of the treating composition into the entire sheet thickness or at least 30% of said thickness.
  • a varnished paper is a paper on which is deposited a glossy transparent layer, penetrating very little into the paper, that is to say in less than 20% of its thickness, generally consisting essentially of a glossy polymer without additional charge and with a dry matter deposition of at least 2 g / m 2 and preferably more than 5 g / m 2 .
  • the varnishing operation being performed outside the paper machine on a specific material, a coating machine, or by means of a coating apparatus.
  • the gloss or flicker of the paper within the meaning of the invention is defined by the visual effect produced at observation at a variable angle between 20 and 80 °.
  • the optical effect produced is situated between a scintillating effect, such as that produced by snow in the sun for example, that is to say shiny points distributed from random way reflecting light, and between a uniform shiny effect without individualized scintillating points.
  • optical effects obtained in the invention are not only variable according to the angle of observation of the treated paper but also according to the ambient lighting, the visual effect is changing depending on the lighting is low, in these conditions glittering points individualized are more particularly visible, or strong, and in these conditions the brilliant effect is homogeneous and very intense. These effects are very different from those obtained in coated calendered papers or varnished papers which never have a scintillating appearance and whose gloss is relatively independent of the lighting conditions.
  • the roughness of the paper is usually measured by means of different devices such as "Bekk”, “Bendtsen” or “Sheffield” apparatus, said roughness measurement is standardized and reference is made here more particularly to the ISO8791-2 standard allowing express the roughness of the paper in ml / min with the "Bendtsen” device.
  • the papers according to the invention have a roughness of at least 30 ml / min and preferably more than 100 ml / min which in the traditional classification of papermakers corresponds to raw papers or very slightly calendered but in no way to papers traditional glosses whose roughness values measured in Bendtsen are at values below 30 ml / min and more generally below 10 ml / min.
  • the textured papers for which the treatment is of particular interest have roughnesses greater than 300 ml / min and generally above 1000 ml / min when texturing using markers or engraved presses is employed.
  • the treatment composition according to the invention is applicable to all types of paper, textured or colored in particular, by means of a tool arranged inside the paper machine, preferably a gluing press, a multiple roller device known as “gate roll” or “massey”, an impregnator, a roller device having pre-dosages for the coating formulation such as for example that called “blade metering size press” (“BMSP”), or any other device comprising at least one roll in contact with the paper.
  • a tool arranged inside the paper machine preferably a gluing press, a multiple roller device known as “gate roll” or “massey”, an impregnator, a roller device having pre-dosages for the coating formulation such as for example that called “blade metering size press” (“BMSP”), or any other device comprising at least one roll in contact with the paper.
  • BMSP blade metering size press
  • Traditional coating tools arranged inside the paper machine can be used, such as for example towing or barbed coatings.
  • the treatment composition according to the invention employs reflective particles in the form of platelets or microbeads incorporating their structure at least one optically transparent material, in general a compound classified in the general family of glasses, for example a borosilicate.
  • the dimensions of the particles are less than 300 ⁇ m and preferably between 50 and 250 ⁇ m so that the reflective effect is optimal. Too fine particles, that is to say the size of the usual coating pigments, typically less than 30 microns, penetrate too much into the paper support during the application of the treatment composition and their shiny or scintillating effect finds it very weak.
  • the reflective effect of the platelets or balls is created by the combination of an optically transparent material and a light reflecting material, the manufacture of such particles in the form of platelets or beads is known per se and carried out in particular by Merck, which has developed technologies to obtain particles with different materials in successive layers.
  • the products used in the context of the invention are remarkable in that they can be used in extremely reduced doses on all types of supports and more particularly on supports of notable roughness as defined above, and in the fact that they are applicable by conventional means present on all paper machines and not only sleeping tools.
  • the roughness of the finished paper is greater than 100 ml / min according to ISO 8791-2 and the microplates or reflective microbeads are incorporated at least 0.05% and preferably at least 0.15%. in dry weight compared to finished paper.
  • the treatment composition according to the invention comprises at least one class of particles in the form of microplates or reflective microbeads incorporating at least one optically transparent material in their structure, and at least one binder for fixing said particles in and on the surface of the paper.
  • Reflective microplates of dimensions between 20 and 200 microns, quite suitable are for example marketed by Merck under the name MIRAVAL® and under the reference 5411 Magic White.
  • the binder can be conventionally a starch, a polyvinyl alcohol, a latex or any other polymer that can be used in a known manner in paper industry.
  • the quantity and nature of said binder is chosen according to the coating means and factors related to the subsequent use of the paper such as, for example, the printing medium employed.
  • binders that can enhance the gloss of the reflective particles are, for example, and without limitation, the polymers selected from the families of polyvinyl alcohols, acrylic latices, polyvinylipyrrolidones.
  • the glossy or scintillating paper which comprises microplates or reflecting microbeads in a proportion of at least 0.05% by dry weight relative to the paper, and preferably at least 0.15%, also contains a polymeric binder at a rate of at least 0.1% by dry weight and preferably more than 1% by weight of paper.
  • the level of binder inside the treatment composition must be sufficiently high, it has been found particularly advantageous to put at least the same amount of binder, in dry weight. incorporated, as reflective particles, and preferably at least twice as much.
  • the process is characterized in that the paper support can be colored, textured, watermarked, laid, marked with markers, engraved presses or any other device known to give a relief or heterogeneity to the paper by any method to inside the paper machine, before the treatment formulation is applied to its surface.
  • the process for obtaining a glossy or scintillating paper is also characterized in that the microplates or reflective microbeads are incorporated in the paper together with the polymeric binder in a treatment composition applied by means of a coating device comprising at least one roll, conventionally a gluing press.
  • the method is particularly well suited for obtaining glossy or glittering colored papers without calendering or coating operation.
  • a treatment composition comprising reflective microplates incorporating at least one optically transparent material in their structure is applied to the gluing press on a paper of 150 g / m 2 textured by means of marker pens. .
  • the treatment composition consists of a solution comprising, by weight relative to the total weight of the formulation: 2% of a polyvinyl alcohol of high viscosity, Mowiol® 28-99 marketed by the company SEPPIC and 0.5% of MIRAVAL® 5411 Magic White from Merck.
  • the carrier of the preceding solution to the sizing press is 35% by weight relative to the paper, which represents a weight of reflective microplates incorporated in the paper of 0.175% and a weight of polymeric binder of 0.7%.
  • Said binder is in quantity four times greater than the amount of reflective microplates in the composition.
  • the brilliant effect obtained is variable depending on the lighting conditions.
  • the gloss effect is homogeneous and very intense.
  • the paper is observed in a poorly lit place it appears essentially sparkling points.
  • the glossy white paper thus obtained has a roughness measured according to the ISO 8791-2 standard of 1500 ml / min.
  • a glossy colored paper and laid paper is obtained by producing a colored paper of 100 g / m 2 laid on the table of the paper machine and colored in its mass in a conventional manner.
  • the colored and textured sheet is coated with the size press with a composition comprising, by weight relative to the total weight of the formulation: 1% of a polyvinyl alcohol of high viscosity, Mowiol® 28-99 sold by the company SEPPIC, 5% by dry weight of a styrene butadiene latex DL 955 marketed by the company DOW CHEMICAL and 2% of MIRAVAL® 5411 Magic White from Merck.
  • a composition comprising, by weight relative to the total weight of the formulation: 1% of a polyvinyl alcohol of high viscosity, Mowiol® 28-99 sold by the company SEPPIC, 5% by dry weight of a styrene butadiene latex DL 955 marketed by the company DOW CHEMICAL and 2% of MIRAVAL® 5411 Magic White from Merck.
  • the treatment composition penetrates the entire thickness of the paper and a load of 40% is found.
  • the reflective microplates are incorporated at a rate of 0.8% by dry weight relative to the weight of paper
  • the polymeric binder represented by the polyvinyl alcohol and the latex is incorporated at the rate of three times the amount of reflective microplates and at a rate of 2.4% based on the weight of paper.
  • the finished paper still has its original color and texture before treatment, the roughness is measured at 1000 ml / min, the gloss of the paper is very strong under a lot of light, producing a particular optical rendering but with the classic characteristics touch and relief provided by the shepherds.
  • the previous solution is applied by means of a gluing press on the base paper in a proportion of at least 30 liters of treatment composition per 100 kg of paper, which taking into account this paper represents approximately 30% of the thickness treated. and a hydrophilic binder amount of 1.8% based on the weight of paper. Reflective microplates are incorporated at a rate of 0.9% dry product over finished paper.
  • the paper thus coated is dried post-drying and the finished product is wound without calendering so as to preserve the texture formed with the engraved presses.
  • the product has the texture of watercolor paper with high gloss and high printability.
  • Such paper can be used for art reproduction on large format inkjet printers or as a support for photo printing in desktop printers. There is no equivalent on the market of such paper that is both textured, glossy and ink-jet-ready, even if produced by a different technique.
  • the fibers used to make the paper may be cellulosic and / or cotton linters, wholly or partly, in association or not with synthetic fibers or fibers of other kinds. All additives traditionally used in paper industry such as additional fillers (talc, kaolin, calcium carbonate, etc.), bonding agents, retention agents, colorants, brighteners, etc. can be used without departing from the scope of the invention.
  • the texture of the product may be strong or non-existent, the paper may be watermarked or not, high or low weight, without departing from the scope of the invention which is to bring a gloss effect to non-calendered and unvarnished papers while retaining their usual appearance properties including roughness and touch.
  • one of the advantages of the invention is that it is possible to produce a paper treated differently on its two sides, directly in the paper-making process, and thus to obtain finally a paper having two different glosses on both sides, which represents a strong commercial advantage.
  • the treatment composition may in particular be added various additives such as co-binders, rheology modifiers, defoamers, antifungals, optical brighteners, dyes and various other compounds traditionally known in paper making without departing from the scope of the invention.

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  • Paper (AREA)

Description

L'invention concerne le domaine des papiers brillants ou scintillants utilisables pour la réalisation de magazines, de brochures, de documents publicitaires, de papiers d'art ou de papiers pour l'impression et l'écriture.The invention relates to the field of glossy or glittering papers used for the production of magazines, brochures, advertising documents, art papers or papers for printing and writing.

Les papiers brillants sont généralement obtenus au moyen d'une opération de calandrage ou de supercalandrage des papiers couchés avec un revêtement essentiellement minéral, ladite opération de calandrage permet de lisser la surface de manière poussée.Glossy papers are generally obtained by means of a calendering or supercalendering operation of coated papers with an essentially inorganic coating, said calendering operation makes it possible to smooth the surface thoroughly.

Le brillant est obtenu sur le papier couché et calandré par la réflexion uniforme de la lumière sur la surface extrêmement lisse et homogène.The gloss is obtained on the coated and calendered paper by the uniform reflection of the light on the extremely smooth and homogeneous surface.

Cette manière de procéder est connue depuis de nombreuses années ainsi que les contraintes inhérentes à ce type de fabrication dont quelques inconvénients connus sont cités ci-dessous :

  • le papier doit être couché ou contenir un taux de charge très élevé afin que l'opération physique de calandrage soit efficace, ce qui nécessite une opération coûteuse si elle est réalisée hors de la ligne de production du papier, ou une opération économiquement défavorable si elle est réalisée sur machine en raison des pertes de productivité engendrées par le dispositif de traitement. Un tel papier couché présente des caractéristiques physiques significativement amoindries par rapport à un papier non couché, notamment en ce qui concerne la rigidité, la résistance à l'éclatement, etc...
  • le papier doit être calandré ou supercalandré, c'est-à-dire que la surface est lissée par une opération de laminage. Cette opération induit également une perte des caractéristiques mécaniques du papier et engendre un papier de toucher minéral, très éloigné des papiers doux et agréables tels que ceux vendus dans les gammes des papiers beaux-arts ou couvertures.
  • Une opération de calandrage telle que décrite précédemment, doit, pour conduire à un brillant uniforme, être effectuée sur un papier très homogène tant dans son aspect de surface que dans son épaisseur pour éviter la formation d'un aspect martelé. Les papetiers se réfèrent à une caractéristique d'épair la plus élevée possible.
This procedure has been known for many years as well as the constraints inherent in this type of manufacture, some of which are known as follows:
  • the paper must be coated or contain a very high loading rate so that the physical calendering operation is effective, which requires an expensive operation if it is performed outside the paper production line, or an economically unfavorable operation if it is performed on machine because of the productivity losses generated by the processing device. Such coated paper has significantly lower physical characteristics compared to uncoated paper, especially with regard to stiffness, burst strength, etc.
  • the paper must be calendered or supercalendered, that is to say that the surface is smoothed by a rolling operation. This operation also induces a loss of the mechanical characteristics of the paper and generates a paper of mineral touch, far removed from soft and pleasant papers such as those sold in the ranges of fine art papers or covers.
  • A calendering operation as described above, must, to achieve a uniform gloss, be performed on a very homogeneous paper both in its surface appearance and in its thickness to prevent the formation of a hammered appearance. Paper makers refer to the highest possible characteristic.

Outre les problèmes précédents le procédé ne permet en aucune façon d'obtenir un papier texturé ou à relief puisque le procédé consiste à niveler complètement la surface.In addition to the above problems the method does not in any way to obtain a textured paper or relief since the method consists in completely leveling the surface.

De tels papiers à relief correspondent, de manière non exclusive, aux papiers des catégories impression et écriture, textes et couvertures et beaux arts, pour lesquels une texture particulière de papier est souvent recherchée. Par texture de papier il doit être compris des papiers disposant de filigranes, d'épairs particuliers, de vergeures, de marquages divers tels que ceux produits avec des feutres à grains ou des presses marqueuses, etc...Such embossed papers correspond, in a non exclusive way, to the papers of the categories printing and writing, texts and covers and fine arts, for which a particular texture of paper is often sought. Paper texture must include papers with watermarks, particular colors, orchards, various markings such as those produced with grain markers or markers, etc ...

Un autre moyen permettant la fabrication de papiers brillants et plus particulièrement desdits papiers à relief consiste à enduire un vernis brillant au cours d'une opération de transformation, hors de la machine à papier. Le brillant est obtenu par une dépose en quantité élevée d'un polymère brillant.Another means for producing glossy papers and more particularly said embossed papers is to coat a gloss varnish during a processing operation, out of the paper machine. The gloss is obtained by a high quantity deposit of a glossy polymer.

Un procédé similaire à celui du vernissage peut être effectué sur une coucheuse avec une formulation voisine de celle d'un vernis.A process similar to that of the varnishing can be performed on a coater with a formulation similar to that of a varnish.

Cette manière de procéder avec les papiers texturés nécessite dans tous les cas une opération supplémentaire et l'application d'une couche épaisse d'un liant brillant, ce qui n'est pas toujours techniquement réalisable suivant le relief du papier.This way of proceeding with textured papers requires in all cases an additional operation and the application of a thick layer of a bright binder, which is not always technically feasible depending on the relief of the paper.

Ce type de traitement de vernissage ou de couchage est connu depuis longtemps et les inconvénients liés au surcoût également.This type of coating or coating treatment is known for a long time and the disadvantages associated with the extra cost also.

Une autre technique consiste à procéder au pelliculage du papier fini avec un film de polymère.Another technique is to laminate the finished paper with a polymer film.

L'opération de pelliculage réalisée hors de la machine à papier, lorsque le papier est fabriqué, est également coûteuse et correspond à une application différente de celle de l'invention, plutôt du domaine de la transformation du papier imprimé que de celui de la production.The laminating operation carried out outside the paper machine, when the paper is manufactured, is also expensive and corresponds to an application different from that of the invention, rather from the field of the transformation of the printed paper than that of the production. .

Les papiers colorés présents sur le marché sont rarement vendus avec un effet brillant car le fait de coucher ces papiers modifie la couleur et conduit à des effets hétérogènes peu vendeurs, le vernissage qui implique une opération supplémentaire conduit à un surcoût rédhibitoire, par ailleurs les machines fabriquant ces papiers ne disposent généralement pas d'un outil de couchage sur la ligne de production et ne sont donc généralement pas aptes à réaliser une dépose de couche brillante dans la même opération que celle de la fabrication du papier, de fait ces papiers sont très peu répandus. Il existe donc un besoin pour la fabrication de papiers colorés brillants, texturés ou non, pouvant être fabriqués de manière économique.The colored papers present on the market are rarely sold with a brilliant effect because the fact of bedding these papers modifies the color and leads to heterogeneous effects little sellers, the varnishing which implies an additional operation leads to an unacceptable extra cost, moreover the machines manufacturing these papers do not generally have a coating tool on the production line and are therefore generally not able to achieve a glossy layer removal in the same operation as that of paper making, in fact these papers are very not widespread. There is therefore a need for the manufacture of glossy colored papers, textured or not, which can be manufactured economically.

FR2192153-A divulgue page 6 exemple 3 une composition de couchage comprenant :

  1. a) une dispersion aqueuse kaolin et d'hexamétaphosphate de sodium.
  2. b) une solution aqueuse ammoniaquée,
  3. c) une solution aqueuse à 15% d'un copolymère d'alcool allylique-acrylamide,
  4. d) un azurant optique,
  5. e) une résine aminoplaste à base d'héxaméthylol-mélamine et de formol,
  6. f) une émulsion aqueuse styrène-butadiène.
FR2192153-A discloses page 6 example 3 a coating composition comprising:
  1. a) an aqueous dispersion of kaolin and sodium hexametaphosphate.
  2. b) an aqueous ammonia solution,
  3. c) a 15% aqueous solution of an allylic alcohol-acrylamide copolymer,
  4. d) an optical brightener,
  5. e) an aminoplast resin based on hexamethylol melamine and formalin,
  6. f) an aqueous styrene-butadiene emulsion.

Cette composition est couchée sur un papier support avec un système d'enduction équipée d'un égalisateur à lame d'air. Ce type de système d'enduction n'équipe pas les machines à papier. En conséquence, le couchage à l'aide de ce système d'enduction n'est pas effectué sur la machine à papier. Par ailleurs, aucun constituant a) à f) de la composition de couchage ne comprend de microplaques ou de microbilles réfléchissantes de dimensions inférieures à 300 microns, intégrant au moins un matériau optiquement transparent dans leur structure.This composition is coated on a support paper with a coating system equipped with an equalizer air knife. This type of coating system does not equip paper machines. As a result, coating with this coating system is not performed on the paper machine. Furthermore, no component a) to f) of the coating composition comprises microplates or reflective microbeads smaller than 300 microns, integrating at least one optically transparent material in their structure.

L'invention a donc pour objectif de résoudre ces principales difficultés, c'est-à-dire fabriquer un papier brillant ou scintillant de manière économique sans opération de calandrage ou de vernissage sur toutes les machines à papier, avec ou sans coucheuse intégrée, et avec tous les supports réalisables, notamment colorés ou texturés.The invention therefore aims to solve these major difficulties, that is to say manufacture a glossy or scintillating paper economically without calendering or varnishing operation on all paper machines, with or without built-in coater, and with all possible supports, especially colored or textured.

Le papier brillant ou scintillant selon l'invention dispose d'une rugosité supérieure à 30 ml/mn mesurée selon la norme ISO 8791-2, il est fabriqué complètement sur machine à papier, et il est caractérisé par le fait qu'il comporte des microplaques ou des microbilles réfléchissantes de dimensions inférieures à 300 µm intégrant au moins un matériau optiquement transparent dans leur structure, en général un composé classé dans la famille générale des verres, par exemple un borosilicate.The glossy or scintillating paper according to the invention has a roughness greater than 30 ml / min measured according to the ISO 8791-2 standard, it is manufactured completely on a paper machine, and it is characterized by the fact that it comprises microplates or reflective microbeads smaller than 300 μm integrating at least one optically transparent material into their structure, generally a compound classified in the general family of glasses, for example a borosilicate.

Les avantages du papier selon l'invention sont à la fois économique, puisqu'il est possible de fabriquer un papier brillant ou scintillant sans opération de calandrage, de couchage ou de transformation, et à la fois technique car les papiers brillants tels que proposés permettent d'obtenir des effets optiques particuliers et notamment un brillant remarquable sur des papiers texturés ou colorés avec un maintien intégral des caractéristiques mécaniques du papier, notamment en ce qui concerne la rigidité et la résistance à l'éclatement.The advantages of the paper according to the invention are both economical, since it is possible to manufacture a glossy or scintillating paper without calendering, coating or processing, and at the same time technical because glossy papers as proposed allow to obtain particular optical effects and in particular a remarkable gloss on textured or colored papers with full maintenance of the mechanical characteristics of the paper, in particular as regards rigidity and resistance to bursting.

Un autre effet remarquable de l'invention, non produit par les papiers couchés calandrés ou les papiers vernis connus est que le rendu optique du papier selon l'invention est variable selon l'éclairage ambiant au moment de l'observation. Lorsque l'éclairage est important, au sens de la lumière atteignant le papier, le traitement conduit à un effet de brillant homogène alors que lorsque l'éclairage est faible des points individualisés scintillants sont perceptibles à la surface dudit papier.Another remarkable effect of the invention, not produced by calendered coated papers or known lacquer papers, is that the optical rendering of the paper according to the invention is variable according to the ambient lighting at the moment of observation. When lighting is important, in the sense of the light reaching the paper, the treatment leads to a uniform gloss effect whereas when the lighting is low scintillated individual points are perceptible on the surface of said paper.

Un autre avantage procuré par la composition de traitement est que le papier traité brillant ou scintillant conserve toutes ses caractéristiques physiques et mécaniques ainsi que ses caractéristiques d'aspect et de toucher, ce qui est déterminant dans le cas des papiers texturés pour lesquels un relief est souhaité et pour lesquels il est souvent demandé un toucher agréable, cela est plus particulièrement le cas pour les papiers incorporant des linters de coton dans leur composition fibreuse. Les traitements de couchage puis de calandrage, ou de vernissage, entraînent la perte de ces propriétés d'aspect qui sont particulièrement appréciées pour les papiers beaux-arts et la plupart des papiers utilisés en impression-écriture.Another advantage provided by the treatment composition is that the glossy or scintillating treated paper retains all its physical and mechanical characteristics as well as its appearance and touch characteristics, which is decisive in the case of textured papers for which a relief is desired and for which it is often required a pleasant touch, this is more particularly the case for papers incorporating cotton linters in their fibrous composition. Coating, coating or varnishing treatments result in the loss of these appearance properties which are particularly appreciated for fine art papers and most papers used in printing and writing.

Compte tenu des avantages précédemment cités et du fait que le traitement est applicable sur un grand nombre de supports différents de nombreux nouveaux produits, inexistants sur le marché, sont réalisables et notamment de manière non limitative :

  • Des papiers texturés colorés brillants ou scintillants.
  • Des papiers à relief brillants ou scintillants aptes à une impression jet d'encre de qualité renforcée selon les enseignements de la demande de brevet FR 2862668.
  • Des papiers filigranés brillants ou scintillants aptes à une impression jet d'encre de qualité renforcée selon les enseignements de la demande de brevet FR 2862668 , par exemple des papiers utilisables en têtes de lettres, mailings, voire même comme papiers de sécurité.
  • Des papiers d'art brillants ou scintillants, tels que des papiers pour l'aquarelle, le dessin, le pastel, etc... disposant des qualités habituelles de contexture et de toucher.
Given the advantages mentioned above and the fact that the treatment is applicable on a large number of different media many new products, nonexistent on the market, are feasible and in particular but not limited to:
  • Glossy or shiny colored textured papers.
  • Glossy or scintillating embossed paper suitable for enhanced quality inkjet printing according to the teachings of the patent application FR 2862668.
  • Glossy or glittering filigree papers suitable for enhanced quality inkjet printing according to the teachings of the patent application FR 2862668 for example, paper used in letterheads, mailings, or even as security papers.
  • Shiny or glittering art papers, such as watercolor, drawing, pastel, etc ... with the usual qualities of texture and touch.

D'autres caractéristiques et avantages de l'invention se dégageront de la description qui va suivre et des exemples non limitatifs fournis.Other features and advantages of the invention will become apparent from the following description and non-limiting examples provided.

Dans cette description et au sens de l'invention il doit être compris par papier couché tout papier disposant à sa surface d'un revêtement comportant au moins un liant polymérique et éventuellement des charges minérales ou organiques, l'opération étant réalisée sur ou hors machine à papier au moyen d'un outil d'enduction permettant de maintenir la couche déposée à la surface du papier c'est-à-dire que ladite couche ne pénètre pas dans plus de 20%, et généralement moins de 10% de l'épaisseur du papier.In this description and in the sense of the invention it must be understood by coated paper any paper having on its surface a coating comprising at least one polymeric binder and optionally inorganic or organic fillers, the operation being carried out on or off the machine. using a coating tool to maintain the layer deposited on the surface of the paper, that is to say that said layer does not penetrate more than 20%, and generally less than 10% of the paper thickness.

Un papier non couché doit être compris comme un papier brut ne comportant soit aucun traitement de surface soit une imprégnation ou une enduction au moyen de dispositifs variés, de préférence à rouleaux, qui obligent la pénétration de la composition de traitement dans la totalité de l'épaisseur de la feuille ou au minimum dans 30% de ladite épaisseur.Uncoated paper is to be understood as a raw paper having either no surface treatment or impregnation or coating by means of various, preferably rolled, devices which force the penetration of the treating composition into the entire sheet thickness or at least 30% of said thickness.

Au sens de cette description un papier vernis est un papier sur lequel est déposé une couche transparente brillante, pénétrant très peu dans le papier, c'est-à-dire dans moins de 20% de son épaisseur, généralement constituée pour l'essentiel d'un polymère brillant sans charge additionnelle et avec une dépose de matière sèche au moins égale à 2 g/m2 et de préférence plus de 5 g/m2. L'opération de vernissage étant réalisée hors de la machine à papier sur un matériel spécifique, une vernisseuse, ou au moyen d'un appareil de couchage.Within the meaning of this description, a varnished paper is a paper on which is deposited a glossy transparent layer, penetrating very little into the paper, that is to say in less than 20% of its thickness, generally consisting essentially of a glossy polymer without additional charge and with a dry matter deposition of at least 2 g / m 2 and preferably more than 5 g / m 2 . The varnishing operation being performed outside the paper machine on a specific material, a coating machine, or by means of a coating apparatus.

Le brillant ou le scintillement du papier au sens de l'invention est défini par l'effet visuel produit à l'observation sous un angle variable entre 20 et 80°. Selon la quantité et la nature de la composition de traitement appliquée l'effet optique produit se situe entre un effet scintillant, tel que celui produit par la neige au soleil par exemple, c'est-à-dire des points brillants répartis de manière aléatoire réfléchissant la lumière, et entre un effet brillant uniforme sans points scintillants individualisés.The gloss or flicker of the paper within the meaning of the invention is defined by the visual effect produced at observation at a variable angle between 20 and 80 °. Depending on the quantity and the nature of the treatment composition applied, the optical effect produced is situated between a scintillating effect, such as that produced by snow in the sun for example, that is to say shiny points distributed from random way reflecting light, and between a uniform shiny effect without individualized scintillating points.

Les effets optiques obtenus dans l'invention sont non seulement variables selon l'angle d'observation du papier traité mais également selon l'éclairage ambiant, l'effet visuel est changeant selon que l'éclairage est faible, dans ces conditions des points scintillants individualisés sont plus particulièrement visibles, ou fort, et dans ces conditions l'effet brillant est homogène et très intense. Ces effets sont très différents de ceux obtenus dans les papiers couchés calandrés ou les papiers vernis qui ne présentent jamais d'aspect scintillant et dont le brillant est relativement indépendant des conditions d'éclairage.The optical effects obtained in the invention are not only variable according to the angle of observation of the treated paper but also according to the ambient lighting, the visual effect is changing depending on the lighting is low, in these conditions glittering points individualized are more particularly visible, or strong, and in these conditions the brilliant effect is homogeneous and very intense. These effects are very different from those obtained in coated calendered papers or varnished papers which never have a scintillating appearance and whose gloss is relatively independent of the lighting conditions.

La rugosité du papier est usuellement mesurée au moyen de différents appareils tels que les appareils « Bekk », « Bendtsen » ou « Sheffield », ladite mesure de rugosité est normalisée et il est fait référence ici plus particulièrement à la norme ISO8791-2 permettant d'exprimer la rugosité du papier en ml/mn avec l'appareil « Bendtsen ». Les papiers selon l'invention ont une rugosité d'au moins 30 ml/mn et de préférence plus de 100 ml/mn ce qui dans le classement traditionnel des papetiers correspond à des papiers bruts ou très légèrement calandrés mais en aucune façon à des papiers brillants traditionnels dont les valeurs de rugosité mesurées en Bendtsen se situent à des valeurs inférieures à 30 ml/mn et plus généralement inférieures à 10 ml/mn.The roughness of the paper is usually measured by means of different devices such as "Bekk", "Bendtsen" or "Sheffield" apparatus, said roughness measurement is standardized and reference is made here more particularly to the ISO8791-2 standard allowing express the roughness of the paper in ml / min with the "Bendtsen" device. The papers according to the invention have a roughness of at least 30 ml / min and preferably more than 100 ml / min which in the traditional classification of papermakers corresponds to raw papers or very slightly calendered but in no way to papers traditional glosses whose roughness values measured in Bendtsen are at values below 30 ml / min and more generally below 10 ml / min.

Les papiers texturés pour lesquels le traitement présente un intérêt particulier disposent de rugosités supérieures à 300 ml/mn et généralement au-dessus de 1000 ml/mn lorsqu'une texturation au moyen de feutres marqueurs ou de presses gravées est employée.The textured papers for which the treatment is of particular interest have roughnesses greater than 300 ml / min and generally above 1000 ml / min when texturing using markers or engraved presses is employed.

La composition de traitement selon l'invention est applicable sur tous les types de papiers, texturés ou colorés notamment, au moyen d'un outil disposé à l'intérieur de la machine à papier, de préférence une presse encolleuse, un dispositif à rouleaux multiples connu sous les noms "gate roll" ou "massey", un imprégnateur, un dispositif à rouleaux disposant de pré-dosages pour la formulation d'enduction tel que par exemple celui baptisé "blade metering size press" ("BMSP"), ou tout autre dispositif comprenant au moins un rouleau en contact avec le papier.The treatment composition according to the invention is applicable to all types of paper, textured or colored in particular, by means of a tool arranged inside the paper machine, preferably a gluing press, a multiple roller device known as "gate roll" or "massey", an impregnator, a roller device having pre-dosages for the coating formulation such as for example that called "blade metering size press" ("BMSP"), or any other device comprising at least one roll in contact with the paper.

Des outils de couchage traditionnels disposés à l'intérieur de la machine à papier peuvent être utilisés, tels que par exemple des couchages à lame traînante ou à barre.Traditional coating tools arranged inside the paper machine can be used, such as for example towing or barbed coatings.

La composition de traitement selon l'invention emploie des particules réfléchissantes sous forme de plaquettes ou de microbilles intégrant dans leur structure au moins un matériau optiquement transparent, en général un composé classé dans la famille générale des verres, par exemple un borosilicate.The treatment composition according to the invention employs reflective particles in the form of platelets or microbeads incorporating their structure at least one optically transparent material, in general a compound classified in the general family of glasses, for example a borosilicate.

Les dimensions des particules, c'est-à-dire leur plus grande longueur dans le cas des microplaques ou le diamètre dans le cas des microbilles, sont inférieures à 300 µm et de préférence comprises entre 50 et 250 µm de manière à ce que l'effet réfléchissant soit optimal. Des particules trop fines, c'est-à-dire de la taille des pigments de couchage usuels, typiquement inférieures à 30 µm, pénètrent trop dans le support papier lors de l'application de la composition de traitement et leur effet brillant ou scintillant s'en trouve très atténué.The dimensions of the particles, that is to say their greatest length in the case of microplates or the diameter in the case of microbeads, are less than 300 μm and preferably between 50 and 250 μm so that the reflective effect is optimal. Too fine particles, that is to say the size of the usual coating pigments, typically less than 30 microns, penetrate too much into the paper support during the application of the treatment composition and their shiny or scintillating effect finds it very weak.

L'effet réfléchissant des plaquettes ou des billes est créé par l'association d'un matériau optiquement transparent et d'un matériau réfléchissant la lumière, la fabrication de telles particules sous forme de plaquettes ou de billes est connue en soi et réalisée notamment par la société Merck qui a développé des technologies permettant d'obtenir des particules avec des matériaux différents en couches successives.The reflective effect of the platelets or balls is created by the combination of an optically transparent material and a light reflecting material, the manufacture of such particles in the form of platelets or beads is known per se and carried out in particular by Merck, which has developed technologies to obtain particles with different materials in successive layers.

Les produits employés dans le cadre de l'invention sont remarquables dans le fait qu'ils peuvent être utilisés à des doses extrêmement réduites sur tous types de supports et plus particulièrement sur des supports de rugosité notable telle que précédemment définie, et dans le fait qu'ils sont applicables par des moyens classiques présents sur toutes les machines à papier et pas seulement des outils de couchage.The products used in the context of the invention are remarkable in that they can be used in extremely reduced doses on all types of supports and more particularly on supports of notable roughness as defined above, and in the fact that they are applicable by conventional means present on all paper machines and not only sleeping tools.

De préférence selon l'invention la rugosité du papier fini est supérieure à 100 ml/mn selon la norme ISO 8791-2 et les microplaques ou les microbilles réfléchissantes sont incorporées à raison d'au moins 0.05% et de préférence à au moins 0.15% en poids sec par rapport au papier terminé.Preferably according to the invention, the roughness of the finished paper is greater than 100 ml / min according to ISO 8791-2 and the microplates or reflective microbeads are incorporated at least 0.05% and preferably at least 0.15%. in dry weight compared to finished paper.

La composition de traitement selon l'invention comporte au moins une catégorie de particules sous forme de microplaques ou de microbilles réfléchissantes intégrant au moins un matériau optiquement transparent dans leur structure, et au moins un liant permettant la fixation desdites particules dans et à la surface du papier. Des microplaques réfléchissantes, de dimensions comprises entre 20 et 200 µm, convenant tout à fait sont par exemple commercialisées par la société Merck sous le nom MIRAVAL® et sous la référence 5411 Magic White.The treatment composition according to the invention comprises at least one class of particles in the form of microplates or reflective microbeads incorporating at least one optically transparent material in their structure, and at least one binder for fixing said particles in and on the surface of the paper. Reflective microplates of dimensions between 20 and 200 microns, quite suitable are for example marketed by Merck under the name MIRAVAL® and under the reference 5411 Magic White.

Le liant peut être de manière classique un amidon, un alcool polyvinylique, un latex ou tout autre polymère utilisable de manière connue en papeterie. La quantité et la nature dudit liant est choisie en fonction du moyen d'enduction employé et de facteurs en relation avec l'utilisation ultérieure du papier tel que par exemple le moyen d'impression employé.The binder can be conventionally a starch, a polyvinyl alcohol, a latex or any other polymer that can be used in a known manner in paper industry. The quantity and nature of said binder is chosen according to the coating means and factors related to the subsequent use of the paper such as, for example, the printing medium employed.

De préférence il est utilisé au moins un liant amenant du brillant et optiquement transparent pour ne pas dégrader l'effet obtenu avec les particules incorporées. De tels liants pouvant renforcer le brillant des particules réfléchissantes sont par exemple, et de manière non limitative, les polymères choisis dans les familles des alcools polyvinyliques, des latex acryliques, des polyvinylipyrrolidones.Preferably it is used at least one binder bringing bright and optically transparent not to degrade the effect obtained with the particles incorporated. Such binders that can enhance the gloss of the reflective particles are, for example, and without limitation, the polymers selected from the families of polyvinyl alcohols, acrylic latices, polyvinylipyrrolidones.

Selon l'invention le papier brillant ou scintillant qui comporte des microplaques ou des microbilles réfléchissantes à raison d'au moins 0.05% en poids sec par rapport au papier, et de préférence à au moins 0.15%, contient également un liant polymérique à raison d'au moins 0.1% en poids sec et de préférence plus de 1% par rapport au poids de papier.According to the invention, the glossy or scintillating paper which comprises microplates or reflecting microbeads in a proportion of at least 0.05% by dry weight relative to the paper, and preferably at least 0.15%, also contains a polymeric binder at a rate of at least 0.1% by dry weight and preferably more than 1% by weight of paper.

De manière à retenir les microplaques ou les microbilles réfléchissantes dans le papier le taux de liant à l'intérieur de la composition de traitement doit être suffisamment élevé, il a été trouvé particulièrement avantageux de mettre au moins la même quantité de liant, en poids sec incorporé, que de particules réfléchissantes, et de préférence au moins deux fois plus.In order to retain the microplates or reflective microbeads in the paper the level of binder inside the treatment composition must be sufficiently high, it has been found particularly advantageous to put at least the same amount of binder, in dry weight. incorporated, as reflective particles, and preferably at least twice as much.

L'invention porte également sur le procédé d'obtention d'un papier brillant ou scintillant de rugosité supérieure à 30 ml/mn mesurée selon la norme ISO 8791-2, fabriqué sur machine à papier en une seule étape, et caractérisé par la succession des phases suivantes :

  • réalisation d'un support papier,
  • enduction sur ledit support d'une composition de traitement comportant des microplaques ou des microbilles réfléchissantes de dimensions inférieures à 300 µm intégrant au moins un matériau optiquement transparent dans leur structure, et comportant au moins un liant polymérique en une quantité sèche au moins égale à celle desdites microplaques ou desdites microbilles.
  • séchage de ladite composition et bobinage du papier fini.
The invention also relates to the process for obtaining a glossy or scintillating paper of roughness greater than 30 ml / min measured according to ISO 8791-2, manufactured on a paper machine in a single step, and characterized by the succession following phases:
  • realization of a paper support,
  • coating said support with a treatment composition comprising microplates or reflective microbeads of dimensions less than 300 μm integrating at least one optically transparent material into their structure, and comprising at least one polymeric binder in a dry amount at least equal to that said microplates or microbeads.
  • drying said composition and winding the finished paper.

De préférence le procédé est caractérisé par le fait que le support papier peut être coloré, texturé, filigrané, vergé, marqué avec des feutres, des presses gravées ou tout autre dispositif connu pour donner un relief ou une hétérogénéité au papier par un procédé quelconque à l'intérieur de la machine à papier, avant que la formulation de traitement soit appliquée à sa surface.Preferably the process is characterized in that the paper support can be colored, textured, watermarked, laid, marked with markers, engraved presses or any other device known to give a relief or heterogeneity to the paper by any method to inside the paper machine, before the treatment formulation is applied to its surface.

Le procédé d'obtention d'un papier brillant ou scintillant est également caractérisé par le fait que les microplaques ou les microbilles réfléchissantes sont incorporées au papier en même temps que le liant polymérique dans une composition de traitement appliquée au moyen d'un dispositif enducteur comportant au moins un rouleau, de manière classique une presse encolleuse.The process for obtaining a glossy or scintillating paper is also characterized in that the microplates or reflective microbeads are incorporated in the paper together with the polymeric binder in a treatment composition applied by means of a coating device comprising at least one roll, conventionally a gluing press.

Le procédé est particulièrement bien adapté pour l'obtention de papiers colorés brillants ou scintillants sans opération de calandrage ou de couchage.The method is particularly well suited for obtaining glossy or glittering colored papers without calendering or coating operation.

EXEMPLE 1EXAMPLE 1

Selon un exemple avantageux de réalisation de l'invention, une composition de traitement comprenant des microplaques réfléchissantes intégrant au moins un matériau optiquement transparent dans leur structure est appliquée à la presse encolleuse sur un papier de 150 g/m2 texturé au moyen de feutres marqueurs.According to an advantageous embodiment of the invention, a treatment composition comprising reflective microplates incorporating at least one optically transparent material in their structure is applied to the gluing press on a paper of 150 g / m 2 textured by means of marker pens. .

La composition de traitement est constituée par une solution comprenant en poids par rapport au poids total de formulation : 2% d'un alcool polyvinylique de viscosité élevée, du Mowiol® 28-99 commercialisé par la société SEPPIC et 0.5% de MIRAVAL® 5411 Magic White de la société Merck.The treatment composition consists of a solution comprising, by weight relative to the total weight of the formulation: 2% of a polyvinyl alcohol of high viscosity, Mowiol® 28-99 marketed by the company SEPPIC and 0.5% of MIRAVAL® 5411 Magic White from Merck.

L'emport de la solution précédente à la presse encolleuse est de 35% en poids par rapport au papier ce qui représente un poids de microplaques réfléchissantes incorporées dans le papier de 0.175% et un poids de liant polymérique de 0.7%. Ledit liant est en quantité quatre fois supérieure à la quantité de microplaques réfléchissantes dans la composition.The carrier of the preceding solution to the sizing press is 35% by weight relative to the paper, which represents a weight of reflective microplates incorporated in the paper of 0.175% and a weight of polymeric binder of 0.7%. Said binder is in quantity four times greater than the amount of reflective microplates in the composition.

L'effet brillant obtenu est variable selon les conditions d'éclairage. Lorsque le papier est observé au soleil ou près d'une lampe l'effet de brillant est homogène et très intense. Lorsque le papier est observé dans un endroit peu éclairé il apparaît essentiellement des points scintillants.The brilliant effect obtained is variable depending on the lighting conditions. When the paper is observed in the sun or near a lamp the gloss effect is homogeneous and very intense. When the paper is observed in a poorly lit place it appears essentially sparkling points.

Le papier blanc brillant ainsi obtenu dispose d'une rugosité mesurée selon la norme ISO 8791-2 de 1500 ml/mn.The glossy white paper thus obtained has a roughness measured according to the ISO 8791-2 standard of 1500 ml / min.

Les caractéristiques mécaniques d'un tel papier, notamment sa rigidité et sa résistance à l'éclatement, sont identiques à celles d'un papier non traité brillant.The mechanical characteristics of such a paper, in particular its rigidity and its resistance to bursting, are identical to those of a non-treated glossy paper.

EXEMPLE 2EXAMPLE 2

Selon un autre exemple un papier coloré brillant et vergé est obtenu en fabriquant un papier coloré de 100 g/m2 vergé sur la table de la machine à papier et coloré dans sa masse de manière classique.According to another example, a glossy colored paper and laid paper is obtained by producing a colored paper of 100 g / m 2 laid on the table of the paper machine and colored in its mass in a conventional manner.

La feuille colorée et texturée est enduite à la presse encolleuse avec une composition comportant en poids par rapport au poids total de formulation : 1% d'un alcool polyvinylique de viscosité élevée, du Mowiol® 28-99 commercialisé par la société SEPPIC, 5% en poids sec d'un latex styrène butadiène DL 955 commercialisé par la société DOW CHEMICAL et 2% de MIRAVAL® 5411 Magic White de la société Merck.The colored and textured sheet is coated with the size press with a composition comprising, by weight relative to the total weight of the formulation: 1% of a polyvinyl alcohol of high viscosity, Mowiol® 28-99 sold by the company SEPPIC, 5% by dry weight of a styrene butadiene latex DL 955 marketed by the company DOW CHEMICAL and 2% of MIRAVAL® 5411 Magic White from Merck.

La composition de traitement pénètre dans la totalité de l'épaisseur du papier et un emport de 40% est constaté. De fait les microplaques réfléchissantes sont incorporées à raison de 0.8% en poids sec par rapport au poids de papier, le liant polymérique représenté par l'alcool polyvinylique et le latex est incorporé à raison de trois fois la quantité de microplaques réfléchissantes et à raison de 2.4% par rapport au poids de papier.The treatment composition penetrates the entire thickness of the paper and a load of 40% is found. In fact, the reflective microplates are incorporated at a rate of 0.8% by dry weight relative to the weight of paper, the polymeric binder represented by the polyvinyl alcohol and the latex is incorporated at the rate of three times the amount of reflective microplates and at a rate of 2.4% based on the weight of paper.

Le papier fini dispose toujours de sa couleur et de sa texture d'origine avant traitement, la rugosité est mesurée à 1000 ml/mn, le brillant du papier est très fort sous un éclairage important, produisant un rendu optique particulier mais avec les caractéristiques classiques du toucher et du relief procuré par les vergeures.The finished paper still has its original color and texture before treatment, the roughness is measured at 1000 ml / min, the gloss of the paper is very strong under a lot of light, producing a particular optical rendering but with the classic characteristics touch and relief provided by the shepherds.

Les caractéristiques mécaniques d'un tel papier, notamment sa rigidité et sa résistance à l'éclatement, sont identiques à celles d'un papier non traité brillant.The mechanical characteristics of such a paper, in particular its rigidity and its resistance to bursting, are identical to those of a non-treated glossy paper.

EXEMPLE 3 :EXAMPLE 3

Papier brillant, de rugosité Bendtsen mesurée à 800 ml/mn, apte à une impression jet d'encre de qualité renforcée telle que définie dans la demande FR 0313700 , comprenant :

  • Un papier support blanc texturé de 250 g/m2 est réalisé par la fabrication d'une base contenant une composition fibreuse de 100 % de linters de coton, dans laquelle est insérée, en poids par rapport aux fibres 15 % de TIXOLEX® 28 de la société RHODIA, 1% en poids d'amidon cationique, 3% en produit commercial d'un agent de collage AQUAPEL® 305 de la société HERCULES et 3% de carbonate de calcium utilisé comme charge additionnelle. La composition précédente est déposée sur la toile d'une forme ronde d'une machine à papier, pressée avec un dispositif de presses gravées pour donner la texture d'un papier aquarelle puis séchée de façon usuelle jusqu'en bout de pré-sécherie où est enduit une composition de traitement à la presse encolleuse.
  • Une composition de traitement comportant en poids des produits commerciaux par rapport au poids total de solution : 6% de PVA cationique CM 318 de la société KURARAY, 10% de TIXOSIL® 365SP à 22% de matières sèches de la société RHODIA et 3% de microplaques réfléchissantes MIRAVAL® 5411 Magic White de la société Merck.
Glossy paper, Bendtsen roughness measured at 800 ml / min, suitable for enhanced quality inkjet printing as defined in the application FR 0313700 , comprising:
  • A textured white backing paper of 250 g / m 2 is produced by the manufacture of a base containing a fibrous composition of 100% cotton linters, in which is inserted, by weight relative to the fibers 15% of TIXOLEX® 28 of the RHODIA company, 1% by weight of cationic starch, 3% of commercial product of AQUAPEL® 305 gluing agent from the company HERCULES and 3% of calcium carbonate used as an additional filler. The previous composition is deposited on the canvas of a round shape of a paper machine, pressed with a device of engraved presses to give the texture of a watercolor paper and then dried in the usual way until the end of pre-drying where is coated a sizing press treatment composition.
  • A treatment composition comprising by weight commercial products relative to the total weight of solution: 6% PVA cationic CM 318 from KURARAY, 10% TIXOSIL® 365SP with 22% solids from RHODIA and 3% from MIRAVAL® 5411 Magic White reflective microplates from Merck.

La solution précédente est appliquée au moyen d'une presse encolleuse sur le papier support à raison d'au moins 30 litres de composition de traitement pour 100 kg de papier, ce qui compte tenu de ce papier représente environ 30% de l'épaisseur traitée et une quantité de liant hydrophile de 1.8% par rapport au poids de papier. Les microplaques réfléchissantes sont incorporées à un taux de 0.9% en produit sec par rapport au papier fini.The previous solution is applied by means of a gluing press on the base paper in a proportion of at least 30 liters of treatment composition per 100 kg of paper, which taking into account this paper represents approximately 30% of the thickness treated. and a hydrophilic binder amount of 1.8% based on the weight of paper. Reflective microplates are incorporated at a rate of 0.9% dry product over finished paper.

Le papier ainsi enduit est séché en post sécherie et le produit fini est bobiné sans calandrage de manière à conserver la texture formée avec les presses gravées. Le produit possède la texture du papier aquarelle avec une brillance élevée et une aptitude élevée à l'impression jet d'encre.The paper thus coated is dried post-drying and the finished product is wound without calendering so as to preserve the texture formed with the engraved presses. The product has the texture of watercolor paper with high gloss and high printability.

Les caractéristiques mécaniques d'un tel papier, notamment sa rigidité et sa résistance à l'éclatement, sont identiques à celles d'un papier non traité brillant.The mechanical characteristics of such a paper, in particular its rigidity and its resistance to bursting, are identical to those of a non-treated glossy paper.

Un tel papier peut être utilisé pour la reproduction d'oeuvres d'art sur des imprimantes jet d'encre de larges formats ou comme support pour des impressions de photos dans des imprimantes de bureau. Il n'existe pas d'équivalent sur le marché d'un tel papier à la fois texturé, brillant et apte au jet d'encre, même produit par une technique différente.Such paper can be used for art reproduction on large format inkjet printers or as a support for photo printing in desktop printers. There is no equivalent on the market of such paper that is both textured, glossy and ink-jet-ready, even if produced by a different technique.

Dans le procédé revendiqué les fibres utilisées pour réaliser le papier peuvent être cellulosiques ou/et des linters de coton, pour tout ou partie, en association ou pas avec des fibres synthétiques ou des fibres d'autres natures. Tous les additifs traditionnellement utilisés en papeterie tels que charges additionnelles (talc, kaolin, carbonate de calcium...), agents de collage, de rétention, colorants, azurants... peuvent être employés sans sortir du cadre de l'invention.In the process claimed the fibers used to make the paper may be cellulosic and / or cotton linters, wholly or partly, in association or not with synthetic fibers or fibers of other kinds. All additives traditionally used in paper industry such as additional fillers (talc, kaolin, calcium carbonate, etc.), bonding agents, retention agents, colorants, brighteners, etc. can be used without departing from the scope of the invention.

La texture du produit peut être forte ou inexistante, le papier peut être filigrané ou pas, de grammage élevé ou bas, sans sortir du cadre de l'invention qui est d'amener un effet de brillance à des papiers non calandrés et non vernis tout en conservant leurs propriétés d'aspect habituelles notamment de rugosité et de toucher.The texture of the product may be strong or non-existent, the paper may be watermarked or not, high or low weight, without departing from the scope of the invention which is to bring a gloss effect to non-calendered and unvarnished papers while retaining their usual appearance properties including roughness and touch.

Outre ceux déjà cités un des avantages de l'invention est qu'il est possible de réaliser un papier traité différemment sur ses deux côtés, directement dans le procédé papetier, et d'obtenir ainsi en final un papier présentant deux brillances différentes sur ses deux faces, ce qui représente un fort avantage commercial. Par exemple un papier marqué avec un feutre marqueur sur une face, et une surface lisse au verso, ou de façon plus sophistiquée deux textures différentes sur les deux faces par combinaisons de différents feutres marqueurs et/ou de presses gravées associées à un traitement identique sur les deux faces à la presse encolleuse.In addition to those already mentioned, one of the advantages of the invention is that it is possible to produce a paper treated differently on its two sides, directly in the paper-making process, and thus to obtain finally a paper having two different glosses on both sides, which represents a strong commercial advantage. For example a paper marked with a marker pen on one side, and a smooth surface on the back, or more sophisticated two different textures on both sides by combinations of different marker pens and / or engraved presses associated with an identical treatment on both sides to the gluing press.

Il est aussi envisageable d'obtenir des effets optiques différents sur les deux faces au moyen d'un papier support symétrique enduit différemment sur ces deux côtés, par exemple en combinant une presse encolleuse et un couchage une face sur la machine à papier, ou un traitement à la presse encolleuse avec des solutions différentes sur les deux faces. Une grande variété de produits est ainsi réalisable.It is also conceivable to obtain different optical effects on both sides by means of a symmetrical support paper coated differently on these two sides, for example by combining a gluing press and one-sided coating on the paper machine, or a gluing press treatment with different solutions on both sides. A wide variety of products is thus feasible.

Selon l'invention il est possible de traiter tous les types de supports papier ce qui signifie que des papiers très particuliers tels que ceux visant à donner au papier une aptitude jet d'encre sont inclus et notamment les produits découlant des techniques décrites dans l'application FR 2862668 de la demanderesse. Selon la combinaison des deux inventions il est possible d'obtenir un papier jet d'encre de qualité renforcée, et de surcroît brillant, directement sur machine à papier. Les essais de papiers combinant les enseignements de la demande FR 2862668 et de la présente invention montrent qu'un papier brillant de qualité jet d'encre renforcée est réalisable et que ce papier conduit à une impression dont la partie imprimée apparaît à l'observateur comme « métallisée » cet effet est tout à fait nouveau et remarquable, surtout si un support texturé est employé.According to the invention, it is possible to process all types of paper media, which means that very specific papers such as those intended to give the paper an ink-jet capability are included, and in particular the products resulting from the techniques described in FIG. application FR 2862668 of the plaintiff. According to the combination of the two inventions it is possible to obtain an inkjet paper of enhanced quality, and moreover bright, directly on a paper machine. Paper tests combining the lessons of demand FR 2862668 and of the present invention show that a glossy paper of enhanced inkjet quality is achievable and that this paper leads to an impression whose printed part appears to the observer as "metallized" this effect is quite new and remarkable especially if a textured support is used.

Plusieurs variantes sont possibles également pour la composition de traitement visant à obtenir un papier brillant, il peut notamment être ajouté divers additifs tels que des co-liants, des agents modificateurs de rhéologie, des antimousses, des antifongiques, des azureurs optiques, des colorants et divers autres composés traditionnellement connus en papeterie sans sortir du cadre de l'invention.Several variants are also possible for the treatment composition to obtain a glossy paper, it may in particular be added various additives such as co-binders, rheology modifiers, defoamers, antifungals, optical brighteners, dyes and various other compounds traditionally known in paper making without departing from the scope of the invention.

Divers moyens d'application de la composition de traitement sont envisageables pour donner des effets variés, il peut par exemple être imaginé de traiter une partie seulement de la feuille de papier pour réaliser des bandes brillantes voisinant avec des bandes de papier brut, en alternance. Il peut aussi être envisagé d'appliquer la composition de traitement par pulvérisation ou par tout autre moyen de couchage, conventionnel ou pas, à l'intérieur de la machine à papier, sans sortir du cadre de l'invention.Various means of application of the treatment composition are conceivable to give various effects, it may for example be imagined to treat only a portion of the paper sheet to make glossy strips neighboring with strips of raw paper, alternately. It may also be envisaged to apply the spray treatment composition or any other coating means, conventional or otherwise, inside the paper machine, without departing from the scope of the invention.

Claims (10)

  1. A glossy or scintillating paper with a roughness greater than 30 ml/min measured in accordance with ISO 8791-2 standard, produced entirely on a paper machine, wherein said paper includes reflecting microplatelets or microbeads with size less than 300 µm incorporating at least one optically transparent material in their structure, generally a component classified in the general family of glasses, for example a borosilicate.
  2. The glossy or scintillating paper as claimed in claim 1, wherein the roughness is greater than 100 ml/min in accordance with ISO 8791-2 standard and the reflecting microplatelets or microbeads are incorporated at a rate of at least 0.05%, preferably at least 0.15% by dry weight based on the finished paper.
  3. The glossy or scintillating paper as claimed in claim 1, obtained by coating with a treatment composition containing reflecting microplatelets or microbeads as well as at least one polymeric binder, which treatment composition enables said microplatelets or microbeads to be incorporated at a rate of at least 0.05% and preferably at least 0.15% by dry weight based on the finished paper, as well as said polymeric binder at a rate of at least 0.1% and preferably more than 1% by dry weight based on the paper weight.
  4. The glossy or scintillating paper as claimed in claim 3, obtained by coating with a treatment composition containing a dry binder weight at least equal to the weight of reflecting microplatelets or microbeads.
  5. The glossy or scintillating paper as claimed in claim 4, wherein the binder employed is chosen from the family of polyvinyl alcohols, acrylic latices or polyvinylpyrrolidones.
  6. The glossy or scintillating paper as claimed in claim 3, wherein the treatment composition is coated by means of equipment possessing at least one roller, for example of the size press, "massey", "gate-roll" or "BMSP" type.
  7. The glossy or scintillating paper as claimed in claim 3, and which can be colored, textured, watermarked, laid, marked with felts or engraved presses, so as to give embossing or non-uniformity to the paper inside the paper machine, before the treatment formulation is applied to its surface.
  8. A method for obtaining a glossy or scintillating paper with a roughness greater than 30 ml/min measured in accordance with ISO 8791-2 standard, produced on a paper machine in a single step, characterized by the following successive steps:
    • producing a substrate paper,
    • coating said substrate with a treatment composition including reflecting microplatelets or microbeads with a size less than 300 µm incorporating at least one optically transparent material in their structure, and including at least one polymeric binder in a dry quantity at least equal to that of said microplatelets or said microbeads,
    • drying said composition and reeling the finished paper.
  9. The method for obtaining a glossy or scintillating paper as claimed in claim 8, wherein the substrate can be colored, textured, watermarked, laid, marked with felts or engraved presses, so as to give embossing or non-uniformity to the paper inside the paper machine, before the treatment formulation is applied to its surface.
  10. The method for obtaining a glossy or scintillating paper as claimed in claim 8, wherein the treatment composition is applied by means of a coating device possessing at least one roller, for example of the size press, "massey", "gate-roll" or "BMSP" type, making it possible to incorporate in the paper a quantity of at least 0.05% and preferably at least 0.15% by dry weight of said microplatelets or microbeads based on the finished paper, as well as at least one polymeric binder at a rate of at least 0.5% and preferably more than 1% by dry weight based on the paper weight.
EP05824442.7A 2004-12-15 2005-12-01 Glossy paper Not-in-force EP1825055B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0413319A FR2879225B1 (en) 2004-12-15 2004-12-15 GLOSSY PAPER
PCT/FR2005/003011 WO2006064101A1 (en) 2004-12-15 2005-12-01 Glossy paper

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EP1825055A1 EP1825055A1 (en) 2007-08-29
EP1825055B1 true EP1825055B1 (en) 2013-10-23

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ES (1) ES2440475T3 (en)
FR (1) FR2879225B1 (en)
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JP6376217B2 (en) * 2014-08-08 2018-08-22 株式会社ニコン Information processing apparatus and program

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FR2879225A1 (en) 2006-06-16
FR2879225B1 (en) 2007-02-16
ZA200705697B (en) 2009-01-28
EP1825055A1 (en) 2007-08-29
US20090294080A1 (en) 2009-12-03
ES2440475T3 (en) 2014-01-29
WO2006064101A1 (en) 2006-06-22

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