EP1761672B1 - Offset printing process - Google Patents

Offset printing process Download PDF

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Publication number
EP1761672B1
EP1761672B1 EP05783927A EP05783927A EP1761672B1 EP 1761672 B1 EP1761672 B1 EP 1761672B1 EP 05783927 A EP05783927 A EP 05783927A EP 05783927 A EP05783927 A EP 05783927A EP 1761672 B1 EP1761672 B1 EP 1761672B1
Authority
EP
European Patent Office
Prior art keywords
pigments
dry weight
surface layer
paper
coated paper
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
EP05783927A
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German (de)
French (fr)
Other versions
EP1761672A1 (en
Inventor
Laurence Avazzeri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArjoWiggins Papiers Couches SA
Original Assignee
ArjoWiggins Papiers Couches SA
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Publication of EP1761672A1 publication Critical patent/EP1761672A1/en
Application granted granted Critical
Publication of EP1761672B1 publication Critical patent/EP1761672B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • 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
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • 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
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
    • 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
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]

Definitions

  • the present invention relates to an offset printing process using a coated paper with a pigmented composition comprising silica.
  • the sheet-fed offset printing method with air drying of inks one of the most common printing processes, has among other requirements that of requiring a drying time of the inks used sufficiently short to allow use fast sheets once printed.
  • “Traditional free air drying offset ink” (or ambient air) means offset inks traditionally used in the offset printing process which normally dry in air and at ambient temperature on the printed sheet. by oxidation polymerization and penetration of a portion of the vehicle of the ink. The drying of these inks does not require a particular energy input such as infra-red heating or UV or electron radiation treatment.
  • said traditional offset inks normally drying in the open are “quadri” offset inks used on coated and uncoated papers intended for the packaging and packaging markets. publishing.
  • the structure of the layer is extremely closed because the manufacturing process requires pronounced calendering or they are obtained by molding the layer on a chrome roll called cast-coating; the drying problem of the inks intensifies, the ink being difficult to penetrate into the paper and to dry.
  • a solution to this problem would be to increase the absorption of the offset ink by the paper layer by the addition of additives in the layer, however, this may cause the lack of transvision (i.e. say the visibility on the back of the sheet of the impression made on the front).
  • silica is a little used pigment in modern coating processes using compositions with high content of dry materials because of its rheological characteristics unfavorable.
  • Silica is mainly used for papers intended for inkjet printing where the requirements are specific and very different from those of the offset process.
  • silica is known for its ability to immobilize the ink on the surface of a paper thus reducing the transvision defect, but with the risk of causing an increase in the drying time of the ink.
  • the Applicant has found that it is possible to reduce the drying time of traditional free-drying inks printed on coated paper by incorporating a small amount of silica into the pigmented composition of the layer present in the paper. surface of the paper, without significantly disturbing the rheological properties of the pigmented composition used, and in particular whether it is a matte coated paper or a glossy coated paper or an iridescent coated paper.
  • the invention thus provides an offset printing process using an offset printing printable coated paper with conventional offset inks drying in the open air characterized in that said paper comprises, on at least one of its faces, a printable surface layer formed of a pigmented composition comprising at least one binder and pigments, including silica pigments in an amount between 0.1 and 15% of the total dry weight of pigments of said composition, and as pigments other than silica, the pigments chosen from calcium carbonates, kaolins, talc, titanium dioxide, coating plastic pigments, special pigments with optical and / or decorative effects, and their mixtures.
  • a pigmented composition comprising at least one binder and pigments, including silica pigments in an amount between 0.1 and 15% of the total dry weight of pigments of said composition, and as pigments other than silica, the pigments chosen from calcium carbonates, kaolins, talc, titanium dioxide, coating plastic pigments, special pigments with optical and / or decorative effects, and their mixtures.
  • said coated paper is offset-printable with conventional offset inks drying in the open air with a drying time of less than 40 minutes, preferably less than or equal to about 30 minutes.
  • the silica content, by dry weight is between 0.5 and 15% of the total dry weight of the pigments of the surface layer. More particularly, the silica content, in dry weight, is between 1 and 11% of the total dry weight of the pigments of said surface layer.
  • the dry layer weight of the surface layer applied to at least one of the faces of the paper is between 2 and 30 g / m 2 per side. More particularly, the weight of the surface layer is between 2 and 20 g / m 2 dry, per side.
  • the surface layer according to the invention comprises at least one binder which may be chosen from polyvinyl alcohol, styrene / butadiene copolymers (used in particular in the form of latex), and mixtures thereof.
  • the invention makes it possible to provide an offset printing process using papers having relatively high levels of plastic pigments used to impart gloss; said surface layer may comprise at least 5%, in particular at least 15% of dry weight plastic pigments, of the total dry weight of the pigments.
  • said paper has a gloss degree, measured at 75 degrees according to ISO 2813, greater than or equal to 90.
  • Said invention makes it possible to provide an offset printing process using ultra-gloss papers by incorporating unusual levels of plastic pigments into said surface layer, said surface layer possibly comprising between 15% and 60% of plastic pigments, preferably at least 30%, more preferably at least 50% of dry weight plastic pigments, of the total dry weight of the pigments.
  • the high-gloss gloss papers usable according to the invention are in particular printable with a drying time of said offset inks less than or equal to about 20 minutes.
  • the invention also makes it possible to provide an offset printing method using an offset printing paper on both sides with a fast drying time of traditional offset inks drying in the open air.
  • the invention provides an offset printing method using paper which is characterized in that it is coated on both sides of said surface layer.
  • the offset-printable surface layer of the coated paper that can be used according to the invention can be deposited by any coating (coating or surfacing or impregnation) means. Preferably, it is deposited by a blade coating process or by an outline coating process such as air-lay coating or curtain coating.
  • the paper may be based on any fibrous sheet, in particular the fibrous base is made by papermaking from cellulosic fibers and / or synthetic fibers.
  • the offset-printable coated paper that can be used according to the invention may comprise, on at least one of its faces, in addition to the printable surface layer further comprising silica pigments in a small quantity, at least one other layer of composition. pigmented composition comprising pigments and at least one binder.
  • the other one or more layers of pigment composition of said offset-printable coated paper are defined as underlays, i.e., lying below the offset-printable surface layer, they may be be deposited (s) by any means of coating (coating or surfacing or impregnation).
  • one or more pigmented sub-layers can be deposited at a rate of 2 to 20 g / m 2 in sec per side, and by undercoat according to the coating method used.
  • said one or more sublayer (s) of pigmented composition may be applied by means of a gluing press on the paper machine on which the paper base is produced.
  • the gluing press may be of the conventional type or it may be a modified model, for example a "Speedsizer” as marketed by Voith.
  • a first underlayer may be coated in a size press and a second pigmented sub-layer may be applied by blade coating, for example.
  • the dry weight of application of a pigmented sub-layer is between 4 and 20 g / m 2 by face.
  • the binder used in the pigment composition sub-layer (s) of the coated paper of the invention may be a styrene / butadiene copolymer, in particular carboxylated (used in latex form) and / or other conventional coating binders such as for example, an amido and / or a polyvinyl alcohol.
  • a coated paper that can be used according to the invention has a grammage of between 80 and 500 g / m 2 , more particularly between 90 and 400 g / m 2 (measurement according to the ISO 536 standard).
  • the invention also relates to the use of an offset-printable coated paper as defined above in an offset printing process with traditional offset inks drying in the open air.
  • a coated paper has the characteristic of being printable with traditional offset inks drying in the open by offset printing and with a drying time of said printed inks less than 40 minutes, preferably less than or equal to about 30 minutes.
  • the invention also relates to the use of a pigmented composition comprising at least one binder and pigments, including silica pigments in an amount of between 0.1 and 15% of the total dry weight of the pigments of said composition, for coating a sheet of paper on at least one of its faces and rendering said sheet printable by offset printing with traditional in-line drying inks so that said inks dry in less than 40 minutes after printing.
  • a pigmented composition as defined above is used.
  • the said pigmented composition is used to produce a coated paper as defined above.
  • a paper having a basis weight of 90 g / m 2 was produced on the surface of which was applied by means of a gluing press 8 g / m 2 total dry weight (4 g / m 2 per side) of a pigmented layer composed of calcium carbonate and starch.
  • a pigmented composition made in an aqueous medium comprising, in parts by weight dry for 100 parts in total dry weight of pigments:
  • Calcium carbonate 100 shares (mixture of 75% and 95% carbonates having an average size ⁇ 2 ⁇ m)
  • Binder styrene-butadiene copolymer (used in latex form): 10 parts
  • PVA 0.5 part
  • Optical brightener 0.7 shares
  • This paper is tested by offset printing on a ROLAND 4-color machine.
  • the drying time of the printing is of the order of 50 minutes.
  • a paper of 90 g / m 2 is produced .
  • this paper was surfaced by sizing press with 8 g / m 2 total dry weight of a pigmented layer identical to that used in Example 1.
  • the paper has a gloss level of 11, measured at 75 degrees.
  • the paper has a BEKK smoothness of 134/99 seconds and an air permeability (vessel vessel Mariotte) measured according to the French standard AFNOR NF-Q-03-075 of 54.10 -3 cm 3 / (m 2 .Not).
  • Example 1 As in Example 1, this paper is tested by offset printing on a ROLAND 4-color machine. The drying time of the printing is of the order of 12 minutes.
  • a layer of a pigmented composition prepared in aqueous medium comprising, by dry weight parts per 100 parts in total dry weight of pigments:
  • Calcium carbonate 47 shares Kaolin: 47 shares
  • Amorphous synthetic silica 1 part
  • Plastic pigments 5 parts (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 ⁇ m and 0.2 ⁇ m)
  • PVA 0.5 part
  • Optical brightener 0.3 shares
  • coated paper formed of a fibrous base (based on cellulose fibers) coated with three pigmented sub-layers and a pigmented surface layer comprising a small amount of silica.
  • the coated paper obtained is calendered. It has a gloss level of 85, measured at 75 degrees.
  • the paper has a BEKK smoothness of 4108/4086 seconds and an air permeability (vessel vase Mariotte) measured according to the French standard AFNOR NF-Q-03-075 of 10.10 -3 cm 3 / (m 2 .Not).
  • This paper is tested by offset printing on a ROLAND 4-color machine.
  • the drying time of the print is 20 minutes.
  • a coated paper (fibrous base coated with three successive pigmented layers) of 170 g / m 2 sold by the ARJOWIGGINS group under the trademark CHROMOMAT® 170 g / m 2 is manufactured .
  • a layer of a pigmented composition made in an aqueous medium comprising, in parts by dry weight for 100 parts in total dry weight of pigments:
  • Calcium carbonate 45 shares (carbonate with 80% of pigments having a mean size ⁇ 1 ⁇ m)
  • Amorphous synthetic silica (average size 5-6 ⁇ m): 5 parts
  • Plastic pigments 50 shares (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 ⁇ m and 0.2 ⁇ m)
  • Binder styrene-butadiene copolymer (used in latex form): 10 parts
  • PVA 0.5 part
  • Optical brightener 0.4 shares
  • the paper obtained is calendered. It has a gloss level of 96, measured at 75 degrees. This paper is tested by offset printing on a ROLAND 4-color machine, the drying time of the printing is 15 minutes.
  • a CHROMOMAT ® coated paper of 170 g / m 2 is manufactured as in Example 4.
  • coated paper of 170 g / m 2 is deposited by curtain coating, on each side, at a rate of 9 g / m 2 dry and per side, a layer of a pigmented composition without silica.
  • this pigmented composition comprises, in parts by dry weight for 100 parts in total dry weight of pigments: Calcium carbonate : 50 shares (carbonate with 80% of pigments having an average size ⁇ 1 ⁇ m) Plastic pigments: 50 shares (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 ⁇ m and 0.2 ⁇ m) Binder styrene-butadiene copolymer (used in latex form): 10 parts PVA: 0.5 part Optical brightener: 0.4 shares
  • the coated paper thus obtained is calendered. It has a gloss level of 100, measured at 75 degrees.
  • This coated paper is tested by offset printing on a ROLAND 4-color machine, the drying time of the printing is 45 minutes.
  • an iridescent pigmented composition carried out in an aqueous medium comprising, in parts by dry weight per 100 parts by total dry weight of pigments: Iridescent pigments of the mica type coated with titanium: 35 shares Amorphous synthetic silica (average size 5-6 ⁇ m): 11 parts Plastic pigments: 54 shares (mixture of hollow microspheres of a styrene-acrylic copolymer a size of about 0.6 ⁇ m and 0.2 ⁇ m) PVA: 20 parts
  • the paper obtained is calendered. It has a gloss level of 55, measured at 75 degrees.
  • the paper has a BEKK smoothness of 496/467 seconds and an air permeability (vessel vase of Mariotte) measured according to the French standard AFNOR NF-Q- 03-075 of 14.10 -3 cm 3 / (m 2 .Pa.s)
  • This paper is tested by offset printing on a ROLAND 4-color machine.
  • the drying time of the inks is of the order of 30 minutes.
  • Said iridescent pigmented composition produced in an aqueous medium comprises, in parts by dry weight per 100 parts by total dry weight of pigments: Iridescent pigments of the mica type coated with titanium: 35 shares Plastic pigments: 65 shares (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 ⁇ m and 0.2 ⁇ m) PVA: 20 parts
  • the coated paper thus obtained is calendered. It has a gloss level of 58, measured at 75 degrees.
  • This paper is tested by offset printing on a ROLAND 4-color machine.
  • the drying time of the inks is several hours.
  • the traditional offset inks used for the tests of all the examples are semi-fresh offset inks of the OPTIMA series of the company LORILLEUX, which dry in the open air.
  • the drying time of the inks it is determined from what drying time there is no longer any ink transfer on the face of another identical paper. For this, the printed and tested side of the paper is superimposed on the blank (non-printed) side of another identical paper (the virgin side is coated with the same pigmented composition), and then with the aid of an ERICHSEN® on applies a defined pressure (force of 200 Newtons) on the face opposite to the tested face using a calibrated piston (4 cm diameter). It is noted from what time of drying in the open air, the ink mark induced by the piston no longer refers to the blank face.
  • silica significantly improves the drying time of the inks.
  • addition of silica makes it possible to incorporate high levels of plastic pigments into the coating composition and thus to obtain high gloss papers suitable for offset printing with fast drying times for traditional inks.
  • compositions pigmented with the silica used in the examples was not affected with respect to the silica-free compositions of the comparative examples when they were used in the coating process.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)

Abstract

The invention concerns a coated paper printable with offset printing using conventional offset inks drying in ambient air comprising, on at least one of its surfaces, a printable surface consisting of a pigmented composition consisting of at least one binder and pigments, including silica pigments in an amount ranging between 0.1 and 15% of the total dry weight of the composition. The invention also concerns the use of said coated paper in an offset printing process using conventional offset inks drying in ambient air, with a drying time of said inks less than 40 minutes after printing.

Description

La présente invention concerne un procédé d'impression offset utilisant un papier couché avec une composition pigmentée comportant de la silice.The present invention relates to an offset printing process using a coated paper with a pigmented composition comprising silica.

Il est connu de l'état de la technique que l'état de surface et l'aspect visuel, mais aussi l'imprimabilité, d'une feuille fibreuse, à base de fibres naturelles et/ou synthétiques, est améliorée par le couchage à la surface de ladite feuille d'une composition constituée d'un ou plusieurs pigments et d'un ou plusieurs liants. De nombreuses publications, comme par exemple « Paper Coating Pigments », Tappi Monograph n°38 (édition 1976 ), décrivent les avantages et les inconvénients des différents pigments utilisés dans l'industrie papetière. Les pigments de couchage les plus utilisés, seuls ou en mélange, compte tenu des exigences qualitatives, techniques et économiques, sont les carbonates de calcium, les kaolins, le talc, le dioxyde de titane et les pigments plastiques.It is known from the state of the art that the surface condition and the visual appearance, but also the printability, of a fibrous sheet, based on natural and / or synthetic fibers, is improved by the coating to the surface of said sheet of a composition consisting of one or more pigments and one or more binders. Many publications, for example "Paper Coating Pigments", Tappi Monograph No. 38 (1976 edition ), describe the advantages and disadvantages of the various pigments used in the paper industry. The most used coating pigments, alone or in combination, considering the qualitative, technical and economic requirements, are calcium carbonates, kaolin, talc, titanium dioxide and plastic pigments.

Or, les propriétés et caractéristiques requises pour une feuille de papier sont pour partie fonction du procédé d'impression auquel est destinée la feuille. Le procédé d'impression offset à feuilles avec séchage des encres à l'air ambiant, l'un des procédés d'impression les plus répandus, présente entre autres exigences celle de nécessiter un temps de séchage des encres utilisées suffisamment court pour permettre une utilisation rapide des feuilles une fois imprimées.However, the properties and characteristics required for a sheet of paper are partly a function of the printing process for which the sheet is intended. The sheet-fed offset printing method with air drying of inks, one of the most common printing processes, has among other requirements that of requiring a drying time of the inks used sufficiently short to allow use fast sheets once printed.

Par « encre offset traditionnelle séchant à l'air libre » (ou à l'air ambiant), on entend les encres offset traditionnellement utilisées dans le procédé d'impression offset qui sèchent normalement à l'air et à température ambiants sur la feuille imprimée par oxydo-polymérisation et pénétration d'une partie du véhicule de l'encre. Le séchage de ces encres ne nécessite pas un apport d'énergie particulier comme un chauffage par infra-rouge ou un traitement par UV ou par rayonnement électronique. En particulier, lesdites encres offset traditionnelles séchant normalement à l'air libre sont des encres offset dites « quadri » utilisées sur des papiers couchés et non couchés destinés aux marchés de l'emballage et de l'édition. A titre d'exemples d'encres offset traditionnelles séchant à l'air libre, on peut se référer par exemple aux encres offset quadri de la série TEMPO commercialisée par la société SICPA, celles de la série LOTUS ou de la série OPTIMA commercialisées par la société LORILLEUX ou celles de la série VERSO commercialisée par la société BRANCHER."Traditional free air drying offset ink" (or ambient air) means offset inks traditionally used in the offset printing process which normally dry in air and at ambient temperature on the printed sheet. by oxidation polymerization and penetration of a portion of the vehicle of the ink. The drying of these inks does not require a particular energy input such as infra-red heating or UV or electron radiation treatment. In particular, said traditional offset inks normally drying in the open are "quadri" offset inks used on coated and uncoated papers intended for the packaging and packaging markets. publishing. As examples of traditional offset inks drying in the open air, it is possible to refer, for example, to the offset inks of the TEMPO series marketed by SICPA, those of the LOTUS series or of the OPTIMA series marketed by the company. LORILLEUX company or those of the VERSO series marketed by BRANCHER.

Ces encres traditionnelles sont parfois qualifiées aussi d'encres fraîches ou demi-fraîches.These traditional inks are sometimes referred to as fresh or semi-fresh inks.

Actuellement, dans le domaine des papiers couchés mats, il est très difficile d'obtenir un bon compromis entre la matité du papier et le temps de séchage des encres d'impression offset traditionnelles séchant à l'air libre, ces deux caractéristiques allant en sens inverse. En effet, pour fabriquer des papiers couchés mats, on utilise en général des pigments grossiers pour obtenir la matité, notamment des pigments de type carbonate de calcium de forte granulométrie, mais l'utilisation de tels pigments engendre un temps de séchage des encres d'impression offset traditionnelles plus long.Currently, in the field of matt coated papers, it is very difficult to obtain a good compromise between the mattness of the paper and the drying time of traditional offset printing inks drying in the open air, these two characteristics making sense reverse. In fact, to manufacture matt coated papers, coarse pigments are generally used to obtain mattness, in particular calcium carbonate pigments of high particle size, but the use of such pigments gives rise to a drying time of the inks. traditional offset printing longer.

On doit par conséquent choisir de favoriser l'une de ces deux caractéristiques au détriment de l'autre ou bien faire un compromis avec des valeurs moyennes. Le problème devient donc crucial lorsque l'on cherche à développer des papiers couchés ultra mats.We must therefore choose to favor one of these two characteristics to the detriment of the other or to make a compromise with average values. The problem becomes crucial when trying to develop ultra-matte coated papers.

Dans le domaine des papiers couchés brillants, on peut rencontrer aussi ce phénomène de temps de séchage des encres d'impression offset traditionnelles très long.In the field of glossy coated papers, it is also possible to encounter this phenomenon of drying time of the very long traditional offset printing inks.

Dans le cas des papiers couchés très brillants, la structure de la couche est extrêmement fermée du fait que le procédé de fabrication nécessite un calandrage prononcé ou qu'ils sont obtenus par moulage de la couche sur un rouleau chromé dit cast-coating ; le problème de séchage des encres s'intensifie, l'encre ayant du mal à pénétrer dans le papier et à sécher.In the case of highly glossy coated papers, the structure of the layer is extremely closed because the manufacturing process requires pronounced calendering or they are obtained by molding the layer on a chrome roll called cast-coating; the drying problem of the inks intensifies, the ink being difficult to penetrate into the paper and to dry.

Le problème se rencontre aussi pour les papiers couchés avec une couche comportant des pigments spéciaux donnant un effet décoratif, comme par exemple les pigments iridescents ou certains pigments métalliques ou métallisés.The problem is also encountered for coated papers with a layer comprising special pigments giving a decorative effect, such as iridescent pigments or certain metallic or metallized pigments.

Actuellement, les temps de séchage des encres offset traditionnelles séchant à l'air libre pour les papiers couchés peuvent être très longs de l'ordre de l'heure, voire jusqu'à plusieurs heures pour les papiers couchés très mats ou très brillants ou encore pour les papiers spéciaux avec des pigments irisés par exemple ; on a observé pour certains papiers couchés très brillants disponibles sur le marché un temps de séchage de 6 heures.Currently, the drying times of traditional offset inks drying in the open air for coated papers can be very long in the order of the hour, or even up to several hours for coated papers very matt or very bright or for special papers with iridescent pigments for example; for some very glossy coated papers available on the market, a drying time of 6 hours has been observed.

Or, le temps de séchage des encres offset après impression sur un papier est une caractéristique très importante pour l'imprimeur, car elle est liée à l'utilisation du papier imprimé. De ce fait, les encres offset traditionnelles séchant à l'air libre doivent répondre à l'exigence de sécher le plus rapidement possible dès qu'elles sont déposées sur leur support.However, the drying time of offset inks after printing on a paper is a very important feature for the printer because it is related to the use of printed paper. As a result, traditional offset inks drying in the open must meet the requirement to dry as soon as possible as soon as they are deposited on their support.

Pour remédier à ce problème de temps de séchage trop long des encres offset traditionnelles séchant à l'air libre, l'imprimeur est parfois amené à utiliser des encres spéciales, plus siccatives, qui sont habituellement utilisées pour l'impression offset des plastiques, et qui une fois déposées sur le papier sècheront plus vite.To remedy this problem of too long drying time of traditional offset inks drying in the open air, the printer is sometimes brought to use special inks, more drying, which are usually used for offset printing plastics, and which once deposited on the paper will dry faster.

Toutefois, ces encres siccatives présentent notamment l'inconvénient d'être des encres chères. Elles ont aussi l'inconvénient de sécher extrêmement vite dans les encriers des machines d'impression.However, these drying inks have the particular disadvantage of being expensive inks. They also have the disadvantage of drying extremely quickly in the inkwells of printing machines.

De ce fait, l'aptitude d'un papier permettant aux encres offset traditionnelles séchant à l'air libre de sécher très rapidement une fois déposées sur leur support, est une caractéristique très recherchée par l'imprimeur, pour pouvoir manipuler le papier le plus rapidement et aisément possible après l'impression, soit pour retourner les piles de papiers imprimés recto afin de réaliser l'impression de la face verso, soit pour le transformer (pliage, découpe, embossage) sans risque de salissures c'est-à-dire sans report d'encre non séchée sur la feuille du dessus dans une pile.As a result, the ability of a paper allowing traditional offset inks drying in the open air to dry very quickly once deposited on their support, is a characteristic much sought after by the printer, to be able to handle the paper the most quickly and easily after printing, either to turn over the stacks of paper printed recto to make the printing of the back side, or to transform it (folding, cutting, embossing) without risk of soiling, that is to say say without postponing undried ink on the top sheet in a stack.

Ce problème devient crucial lorsque l'on cherche à développer des papiers couchés allant vers les extrêmes en matité ou en brillance et/ou présentant des effets particuliers comme les papiers couchés avec des effets irisés.This problem becomes crucial when one seeks to develop coated papers going to extremes in dullness or brilliance and / or presenting particular effects such as coated papers with iridescent effects.

Le but de l'invention est par conséquent de fournir des papiers couchés imprimables par offset ayant, après impression, un temps de séchage rapide des encres offset traditionnelles séchant à l'air libre, plus particulièrement pour des papiers couchés extrêmes en matité ou en brillance ou avec des pigments spéciaux.The object of the invention is therefore to provide offset-printable coated papers having, after printing, a fast drying time of traditional offset inks drying in the open air, more particularly for extreme coated papers in dullness or gloss or with special pigments.

Une solution pour remédier à ce problème consisterait à augmenter l'absorption de l'encre offset par la couche du papier par l'ajout d'additifs dans la couche, toutefois cela risque de provoquer le défaut de transvision (c'est-à-dire la visibilité au verso de la feuille de l'impression réalisée au recto).A solution to this problem would be to increase the absorption of the offset ink by the paper layer by the addition of additives in the layer, however, this may cause the lack of transvision (i.e. say the visibility on the back of the sheet of the impression made on the front).

Parmi les pigments de couchage connus, la silice est un pigment utilisé pour ses propriétés optiques, pouvoir matifiant, blancheur et opacité, et pour sa capacité à remplacer partiellement le dioxyde de titane.Of the known coating pigments, silica is a pigment used for its optical properties, matting power, whiteness and opacity, and for its ability to partially replace titanium dioxide.

Néanmoins, la silice est un pigment peu utilisé dans les procédés de couchage modernes utilisant des compositions à haute teneur en matières sèches du fait de ses caractéristiques rhéologiques peu favorables.Nevertheless, silica is a little used pigment in modern coating processes using compositions with high content of dry materials because of its rheological characteristics unfavorable.

Le document EP-A-1245731 décrit un papier imprimable par impression offset comprenant une couche de surface imprimable formée d'une composition pigmentée comportant au moins un liant et des pigments, dont des pigments de silice en une quantité comprise entre 50 et 95% du poids sec total des pigments de ladite composition.The document EP-A-1245731 discloses an offset printing printable paper comprising a printable surface layer of a pigmented composition comprising at least one binder and pigments, including silica pigments in an amount of from 50 to 95% of the total dry weight of the pigments of said pigment composition.

La silice est principalement utilisée pour des papiers destinés à l'impression jet d'encre où les exigences sont spécifiques et très différentes de celles du procédé offset.Silica is mainly used for papers intended for inkjet printing where the requirements are specific and very different from those of the offset process.

Par ailleurs, la silice est connue pour sa faculté à immobiliser l'encre à la surface d'un papier réduisant ainsi le défaut de transvision, mais avec le risque de provoquer une augmentation du temps de séchage de l'encre.On the other hand, silica is known for its ability to immobilize the ink on the surface of a paper thus reducing the transvision defect, but with the risk of causing an increase in the drying time of the ink.

De manière surprenante, la Demanderesse a trouvé qu'il est possible de réduire le temps de séchage des encres offset traditionnelles séchant à l'air libre imprimées sur papier couché, en incorporant une petite quantité de silice à la composition pigmentée de la couche présente en surface du papier, sans perturber notablement les propriétés rhéologiques de la composition pigmentée mise en oeuvre, et notamment que ce soit un papier couché mat ou un papier couché brillant ou encore un papier couché irisé.Surprisingly, the Applicant has found that it is possible to reduce the drying time of traditional free-drying inks printed on coated paper by incorporating a small amount of silica into the pigmented composition of the layer present in the paper. surface of the paper, without significantly disturbing the rheological properties of the pigmented composition used, and in particular whether it is a matte coated paper or a glossy coated paper or an iridescent coated paper.

L'invention fournit ainsi un procédé d'impression offset utilisant un papier couché imprimable par impression offset avec des encres offset traditionnelles séchant à l'air libre caractérisé en ce que ledit papier comprend, sur au moins l'une de ses faces, une couche de surface imprimable formée d'une composition pigmentée comportant au moins un liant et des pigments, dont des pigments de silice en une quantité comprise entre 0,1 et 15 % du poids sec total des pigments de ladite composition, et comme pigments autres que la silice, les pigment choisis parmi les carbonates de calcium, les kaolins, le talc, le dioxyde de titane, les pigments plastiques de couchage, les pigments spéciaux à effet optique et/ou décoratifs, et leurs mélanges.The invention thus provides an offset printing process using an offset printing printable coated paper with conventional offset inks drying in the open air characterized in that said paper comprises, on at least one of its faces, a printable surface layer formed of a pigmented composition comprising at least one binder and pigments, including silica pigments in an amount between 0.1 and 15% of the total dry weight of pigments of said composition, and as pigments other than silica, the pigments chosen from calcium carbonates, kaolins, talc, titanium dioxide, coating plastic pigments, special pigments with optical and / or decorative effects, and their mixtures.

Selon l'invention, ledit papier couché est imprimable par offset avec des encres offset traditionnelles séchant à l'air libre avec un temps de séchage inférieur à 40 minutes, de préférence inférieur ou égal à environ 30 minutes.According to the invention, said coated paper is offset-printable with conventional offset inks drying in the open air with a drying time of less than 40 minutes, preferably less than or equal to about 30 minutes.

De préférence, le taux de silice, en poids sec, est compris entre 0,5 et 15 % du poids sec total des pigments de la couche de surface. Plus particulièrement le taux de silice, en poids sec, est compris entre 1 et 11 % du poids sec total des pigments de ladite couche de surface.Preferably, the silica content, by dry weight, is between 0.5 and 15% of the total dry weight of the pigments of the surface layer. More particularly, the silica content, in dry weight, is between 1 and 11% of the total dry weight of the pigments of said surface layer.

Selon l'invention, la silice est de préférence une silice synthétique amorphe.According to the invention, the silica is preferably an amorphous synthetic silica.

Le poids de couche en sec de la couche de surface appliqué sur au moins une des faces du papier est compris entre 2 et 30 g/m2 par face. Plus particulièrement, le poids de la couche de surface est compris entre 2 et 20 g/m2 en sec, par face.The dry layer weight of the surface layer applied to at least one of the faces of the paper is between 2 and 30 g / m 2 per side. More particularly, the weight of the surface layer is between 2 and 20 g / m 2 dry, per side.

La couche de surface selon l'invention comporte au moins un liant qui peut être choisi parmi l'alcool polyvinylique, les copolymères styrène/butadiène (utilisés notamment sous forme de latex), et leur mélanges.The surface layer according to the invention comprises at least one binder which may be chosen from polyvinyl alcohol, styrene / butadiene copolymers (used in particular in the form of latex), and mixtures thereof.

Selon un cas particulier de l'invention, les pigments plastiques de la couche de surface sont des microsphères creuses d'un copolymère styrène-acrylique ayant une taille moyenne comprise entre 1 et 0,1 µm.According to a particular case of the invention, the plastic pigments of the surface layer are hollow microspheres of a styrene-acrylic copolymer having an average size of between 1 and 0.1 μm.

Selon l'invention, les pigments spéciaux à effet optique et/ou décoratif de la couche de surface peuvent être des pigments iridescents.According to the invention, the special pigments with optical and / or decorative effect of the surface layer may be iridescent pigments.

Selon un cas particulier de l'invention, notamment dans le cas d'un procédé d'impression offset utilisant des papiers avec une couche de surface contenant des pigments spéciaux, notamment iridescents, ladite couche de surface comporte un alcool polyvinylique (PVA) comme liant. Plus particulièrement, ladite couche comporte un taux de PVA compris entre 10 % et 30 % en poids sec, du poids sec total des pigments de ladite couche. De préférence, ladite couche comporte entre 5 et 15 % de silice, en poids sec, du poids sec total des pigments de ladite couche de surface. De préférence aussi ladite composition pigmentée de la couche de surface comporte au moins 50 % de pigments plastiques en poids sec, du poids sec total des pigments. En particulier ledit papier avec les pigments iridescents est imprimable avec un temps de séchage desdites encres offset inférieur ou égal à environ 30 minutes.According to a particular case of the invention, especially in the case of an offset printing process using papers with a surface layer containing special pigments, especially iridescent pigments, said surface layer comprises a polyvinyl alcohol (PVA) as a binder . More in particular, said layer comprises a PVA content of between 10% and 30% by dry weight, of the total dry weight of the pigments of said layer. Preferably, said layer comprises between 5 and 15% of silica, by dry weight, of the total dry weight of the pigments of said surface layer. Preferably also said pigmented composition of the surface layer comprises at least 50% of dry weight plastic pigments, the total dry weight of the pigments. In particular said paper with iridescent pigments is printable with a drying time of said offset inks less than or equal to about 30 minutes.

Selon un cas particulier, l'invention est relative à un procédé d'impression offset utilisant un papier mat; ledit papier dont ladite couche de surface comporte entre 1 et 5 % de silice en poids sec, du poids sec total des pigments de la composition ladite couche a un degré de brillance, mesuré à 75 degrés selon la norme internationale ISO 2813, inférieur ou égal à 20. De préférence, ledit papier est ultra mat, son degré de brillance, mesuré à 75 degrés selon la norme ISO 2813, est inférieur ou égal à 15, de préférence inférieur ou égal à 13. De préférence, ledit papier est imprimable avec un temps de séchage des encres offset traditionnelles séchant à l'air libre inférieur ou égal à 15 minutes. Selon un autre cas particulier, l'invention est relative à un procédé d'impression offset utilisant un papier brillant; ledit papier dont la couche de surface comprend entre 1 % et 10 % de silice en poids sec, du poids sec total des pigments de ladite couche de surface, a un degré de brillance, mesuré à 75 degrés selon la norme ISO 2813, supérieur ou égal à 70.According to a particular case, the invention relates to an offset printing process using a matte paper; said paper of which said surface layer comprises between 1 and 5% of silica by dry weight, of the total dry weight of the pigments of the composition said layer has a degree of gloss, measured at 75 degrees according to the international standard ISO 2813, less than or equal to at 20. Preferably, said paper is ultra matte, its degree of gloss, measured at 75 degrees according to the ISO 2813 standard, is less than or equal to 15, preferably less than or equal to 13. Preferably, said paper is printable with a drying time of traditional offset inks drying in the open air less than or equal to 15 minutes. According to another particular case, the invention relates to an offset printing process using a glossy paper; said paper, the surface layer of which comprises between 1% and 10% of silica by dry weight, of the total dry weight of the pigments of said surface layer, has a degree of gloss, measured at 75 degrees according to ISO 2813, higher or equal to 70.

L'invention permet de fournir un procédé d'impression offset utilisant des papiers comportant des taux relativement élevés en pigments plastiques utilisés pour donner de la brillance; ladite couche de surface peut comporter au moins 5%, en particulier au moins 15% de pigments plastiques en poids sec, du poids sec total des pigments. De préférence, ledit papier a un degré de brillance, mesuré à 75 degrés selon la norme ISO 2813, supérieur ou égal à 90.The invention makes it possible to provide an offset printing process using papers having relatively high levels of plastic pigments used to impart gloss; said surface layer may comprise at least 5%, in particular at least 15% of dry weight plastic pigments, of the total dry weight of the pigments. Preferably, said paper has a gloss degree, measured at 75 degrees according to ISO 2813, greater than or equal to 90.

Ladite invention permet de fournir un procédé d'impression offset utilisant des papiers ultra brillants en incorporant à ladite couche de surface des taux inhabituels de pigments plastiques, ladite couche de surface pouvant comporter entre 15 % et 60 % de pigments plastiques, de préférence au moins 30 %, plus préférentiellement au moins 50 % de pigments plastiques en poids sec, du poids sec total des pigments.Said invention makes it possible to provide an offset printing process using ultra-gloss papers by incorporating unusual levels of plastic pigments into said surface layer, said surface layer possibly comprising between 15% and 60% of plastic pigments, preferably at least 30%, more preferably at least 50% of dry weight plastic pigments, of the total dry weight of the pigments.

Les papiers brillants à ultra-brillants utilisable selon l'invention sont en particulier imprimables avec un temps de séchage desdites encres offset inférieur ou égal à environ 20 minutes.The high-gloss gloss papers usable according to the invention are in particular printable with a drying time of said offset inks less than or equal to about 20 minutes.

L'invention permet aussi de fournir un procédé d'impression offset utilisant un papier imprimable par offset sur ses deux faces avec un temps de séchage rapide des encres offset traditionnelles séchant à l'air libre. Ainsi l'invention fournit un procédé d'impression offset utilisant un papier qui se caractérise en ce qu'il, est revêtu sur ses deux faces de ladite couche de surface.The invention also makes it possible to provide an offset printing method using an offset printing paper on both sides with a fast drying time of traditional offset inks drying in the open air. Thus the invention provides an offset printing method using paper which is characterized in that it is coated on both sides of said surface layer.

La couche de surface imprimable par offset du papier couché utilisable selon l'invention peut être déposée par tout moyen d'enduction (de couchage ou de surfaçage ou d'imprégnation). De préférence, elle est déposée par un procédé de couchage à lame ou par un procédé de couchage contour comme le couchage lame d'air ou le couchage rideau.The offset-printable surface layer of the coated paper that can be used according to the invention can be deposited by any coating (coating or surfacing or impregnation) means. Preferably, it is deposited by a blade coating process or by an outline coating process such as air-lay coating or curtain coating.

Le papier peut avoir pour base toute feuille fibreuse, en particulier la base fibreuse est fabriquée par voie papetière à partir de fibres cellulosiques et/ou de fibres synthétiques.The paper may be based on any fibrous sheet, in particular the fibrous base is made by papermaking from cellulosic fibers and / or synthetic fibers.

Le papier couché imprimable par offset utilisable selon l'invention peut comprendre, sur au moins l'une de ses faces, en plus de la couche de surface imprimable comprenant en outre des pigments de silice en petite quantité, au moins une autre couche de composition pigmentée comportant des pigments et au moins un liant. La ou les autres couche(s) de composition pigmentée dudit papier couché imprimable par offset sont définie(s) comme étant des sous-couches, c'est-à-dire situées en dessous de la couche de surface imprimable par offset, elles peuvent être déposée(s) par tout moyen d'enduction (de couchage ou de surfaçage ou d'imprégnation). Selon l'invention, une ou plusieurs sous-couches pigmentées peuvent être déposées à raison de 2 à 20 g/m2 en sec par face, et par sous-couche suivant le procédé d'enduction utilisé.The offset-printable coated paper that can be used according to the invention may comprise, on at least one of its faces, in addition to the printable surface layer further comprising silica pigments in a small quantity, at least one other layer of composition. pigmented composition comprising pigments and at least one binder. The other one or more layers of pigment composition of said offset-printable coated paper are defined as underlays, i.e., lying below the offset-printable surface layer, they may be be deposited (s) by any means of coating (coating or surfacing or impregnation). According to the invention, one or more pigmented sub-layers can be deposited at a rate of 2 to 20 g / m 2 in sec per side, and by undercoat according to the coating method used.

Selon un cas particulier de l'invention, la ou les dite(s) sous-couche(s) de composition pigmentée peuvent être appliquée(s) au moyen d'une presse encolleuse sur la machine à papier sur laquelle la base du papier est produite. La presse encolleuse peut être du type classique ou il peut s'agir d'un modèle modifié, par exemple une « Speedsizer » telle que commercialisée par Voith.According to a particular case of the invention, said one or more sublayer (s) of pigmented composition may be applied by means of a gluing press on the paper machine on which the paper base is produced. The gluing press may be of the conventional type or it may be a modified model, for example a "Speedsizer" as marketed by Voith.

D'autres procédés d'enduction peuvent être utilisés pour autant qu'ils soient appropriés pour l'application des poids de couche souhaités, plusieurs sous-couches pouvant être appliquées selon des procédés différents. Une première sous-couche peut être enduite en presse encolleuse et une seconde sous-couche pigmentée peut être appliquée par couchage par lame par exemple.Other coating methods may be used as long as they are suitable for applying the desired layer weights, with several sub-layers being able to be applied by different methods. A first underlayer may be coated in a size press and a second pigmented sub-layer may be applied by blade coating, for example.

Par exemple, dans le cas du traitement de surface par presse encolleuse, c'est-à-dire une enduction deux faces, le poids sec d'application d'une sous-couche pigmentée est compris entre 4 et 20 g/m2 par face.For example, in the case of surface treatment by gluing press, that is to say a two-sided coating, the dry weight of application of a pigmented sub-layer is between 4 and 20 g / m 2 by face.

Selon l'invention, la ou les sous-couches de composition pigmentée du papier couché peuvent comporter comme pigments, des charges choisies parmi les carbonates, les kaolins, les pigments plastiques de couchage, le dioxyde de titane et les pigments spéciaux à effet optique et/ou décoratifs, et leurs mélanges.According to the invention, the pigmented composition sub-layer (s) of the coated paper may comprise, as pigments, fillers chosen from carbonates, kaolins, coating plastic pigments, titanium dioxide and special pigments with optical effect and or decorative, and mixtures thereof.

Le liant utilisé dans la ou les sous-couches de composition pigmentée du papier couché de l'invention peut être un copolymère styrène/butadiène, en particulier carboxylé (utilisé sous forme de latex) et/ou d'autres liants de couchage classiques comme par exemple, un amido et/ou un alcool polyvinylique.The binder used in the pigment composition sub-layer (s) of the coated paper of the invention may be a styrene / butadiene copolymer, in particular carboxylated (used in latex form) and / or other conventional coating binders such as for example, an amido and / or a polyvinyl alcohol.

De préférence un papier couché utilisable selon l'invention a un grammage compris entre 80 et 500 g/m2, plus particulièrement entre 90 et 400 g/m2 (mesure selon la norme ISO 536).Preferably a coated paper that can be used according to the invention has a grammage of between 80 and 500 g / m 2 , more particularly between 90 and 400 g / m 2 (measurement according to the ISO 536 standard).

L'invention concerne également l'utilisation d'un papier couché imprimable par offset tel que défini précédemment dans un procédé d'impression offset avec des encres offset traditionnelles séchant à l'air libre. Selon l'invention, un tel papier couché présente la caractéristique d'être imprimable avec des encres offset traditionnelles séchant à l'air libre par impression offset et ce avec un temps de séchage desdites encres imprimées inférieur à 40 minutes, de préférence inférieur ou égal à environ 30 minutes.The invention also relates to the use of an offset-printable coated paper as defined above in an offset printing process with traditional offset inks drying in the open air. According to the invention, such a coated paper has the characteristic of being printable with traditional offset inks drying in the open by offset printing and with a drying time of said printed inks less than 40 minutes, preferably less than or equal to about 30 minutes.

L'invention concerne aussi l'utilisation d'une composition pigmentée comportant au moins un liant et des pigments, dont des pigments de silice en une quantité comprise entre 0,1 et 15 % du poids sec total des pigments de ladite composition, pour revêtir une feuille de papier sur au moins l'une de ses faces et rendre ladite feuille imprimable par impression offset avec les encres traditionnelles séchant à l'air libre de telle sorte que lesdites encres sèchent en moins de 40 minutes après impression. En particulier, on utilise une composition pigmentée telle que définie précédemment. En particulier on utilise ladite composition pigmentée pour fabriquer un papier couché tel que défini précédemment.The invention also relates to the use of a pigmented composition comprising at least one binder and pigments, including silica pigments in an amount of between 0.1 and 15% of the total dry weight of the pigments of said composition, for coating a sheet of paper on at least one of its faces and rendering said sheet printable by offset printing with traditional in-line drying inks so that said inks dry in less than 40 minutes after printing. In particular, a pigmented composition as defined above is used. In particular, the said pigmented composition is used to produce a coated paper as defined above.

L'invention sera mieux comprise à l'aide des exemples non limitatifs suivants :The invention will be better understood with the aid of the following nonlimiting examples:

EXEMPLE 1 comparatif : papier ultra mat selon l'art antérieur (sans silice):COMPARATIVE EXAMPLE 1: Ultra-matte paper according to the prior art (without silica):

Sur une machine à papier à table plate (de type Fourdrinier), on fabrique un papier ayant un grammage de 90 g/m2 sur la surface duquel on a appliqué au moyen d'une presse encolleuse 8 g/m2 en poids sec total (4 g/m2 par face) d'une couche pigmentée composée de carbonate de calcium et d'amidon.On a flat-bottomed paper machine (Fourdrinier type), a paper having a basis weight of 90 g / m 2 was produced on the surface of which was applied by means of a gluing press 8 g / m 2 total dry weight (4 g / m 2 per side) of a pigmented layer composed of calcium carbonate and starch.

Sur ce papier de 90 g/m2, on dépose hors ligne par couchage à lame, sur chaque face, à raison de 15 g/m2 en sec et par face, une composition pigmentée réalisée en milieu aqueux, comportant, en parts poids sec pour 100 parts en poids total sec de pigments : Carbonate de calcium : 100 parts (mélange de carbonates à 75 % et à 95 % ayant une taille moyenne < 2 µm) Liant copolymère styrène-butadiène (utilisé sous forme de latex) : 10 parts PVA : 0,5 part Azurant optique : 0,7 part On this paper of 90 g / m 2 , is deposited off-line by coating blade, on each side, at a rate of 15 g / m 2 dry and per side, a pigmented composition made in an aqueous medium, comprising, in parts by weight dry for 100 parts in total dry weight of pigments: Calcium carbonate : 100 shares (mixture of 75% and 95% carbonates having an average size <2 μm) Binder styrene-butadiene copolymer (used in latex form): 10 parts PVA: 0.5 part Optical brightener: 0.7 shares

Il a un niveau de brillance de 12, mesure faite selon la norme ISO 2813 par un brillancemètre Byk Gardner orienté à 75° par rapport à la normale.It has a gloss level of 12, measured according to ISO 2813 by a Byk Gardner glossmeter oriented at 75 ° to normal.

On teste ce papier par impression offset sur une machine ROLAND 4 couleurs.This paper is tested by offset printing on a ROLAND 4-color machine.

Le temps de séchage de l'impression est de l'ordre de 50 minutes.The drying time of the printing is of the order of 50 minutes.

EXEMPLE 2 : Papier ultra mat selon l'invention :EXAMPLE 2 Ultra-matte paper according to the invention

On fabrique un papier de 90 g/m2. Comme dans l'exemple 1, ce papier a été surfacé par presse encolleuse avec 8 g/m2 en poids sec total d'une couche pigmentée identique à celle utilisée dans l'exemple 1.A paper of 90 g / m 2 is produced . As in Example 1, this paper was surfaced by sizing press with 8 g / m 2 total dry weight of a pigmented layer identical to that used in Example 1.

Sur ce papier de 90 g/m2, on dépose hors ligne par couchage par lame, sur chaque face, à raison de 15 g/m2 en sec par face, une composition pigmentée réalisée en milieu aqueux, comportant, en parts poids sec pour 100 parts en poids total sec de pigments : Carbonate de calcium : 97 parts (mélange de carbonates à 75 % et à 95 % ayant une taille moyenne < 2 µm) Silice synthétique amorphe (taille moyenne des particules 5-6 µm): 3 parts Liant copolymère styrène-butadiène (utilisé sous forme de latex) : 10 parts PVA : 0,5 part Azurant optique : 0,7 part On this 90 g / m 2 paper, off-line coating is deposited per slide, on each side, at a rate of 15 g / m 2 dry per side, a pigmented composition produced in an aqueous medium, comprising, in parts by dry weight. per 100 parts by total dry weight of pigments: Calcium carbonate : 97 shares (mixture of 75% and 95% carbonates having an average size <2 μm) Amorphous synthetic silica (average particle size 5-6 μm): 3 parts Binder styrene-butadiene copolymer (used in latex form): 10 parts PVA: 0.5 part Optical brightener: 0.7 shares

Le papier a un niveau de brillance de 11, mesuré à 75 degrés.The paper has a gloss level of 11, measured at 75 degrees.

Le papier a un lissé BEKK recto/verso de 134/99 secondes et une perméabilité à l'air (appareil vase de Mariotte) mesurée selon la norme française AFNOR NF-Q-03-075 de 54.10-3 cm3/(m2.Pa.s).The paper has a BEKK smoothness of 134/99 seconds and an air permeability (vessel vessel Mariotte) measured according to the French standard AFNOR NF-Q-03-075 of 54.10 -3 cm 3 / (m 2 .Not).

Comme à l'exemple 1, on teste ce papier par impression offset sur une machine ROLAND 4 couleurs. Le temps de séchage de l'impression est de l'ordre de 12 minutes.As in Example 1, this paper is tested by offset printing on a ROLAND 4-color machine. The drying time of the printing is of the order of 12 minutes.

On a donc un gain important (38 minutes) de temps de séchage par rapport à l'exemple 1 pour une matité similaire.There is therefore a significant gain (38 minutes) of drying time compared to Example 1 for a similar dullness.

EXEMPLE 3 : Papier brillant selon l'invention :EXAMPLE 3 Glossy Paper According to the Invention

On fabrique un papier couché (base fibreuse revêtue de trois couches pigmentées successives) de 150 g/m2 commercialisé par le groupe ARJOWIGGINS sous la marque CHROMOMAT® 150g/m2.Coated paper is produced (fibrous base coated with three pigmented layers successive) of 150 g / m 2 marketed by the ARJOWIGGINS group under the trademark CHROMOMAT® 150g / m 2 .

Sur ce papier couché de 150 g/m2, on dépose par couchage rideau, à raison de 8 g/m2 en sec par face, une couche d'une composition pigmentée réalisée en milieu aqueux, comportant, en parts poids sec pour 100 parts en poids total sec de pigments : Carbonate de calcium : 47 parts Kaolin : 47 parts Silice synthétique amorphe : 1 part Pigments plastiques : 5 parts (mélange de microsphères creuses d'un copolymère styrène-acrylique possédant une taille d'environ 0,6 µm et 0,2 µm) Liant copolymère styrène-butadiène (utilisé sous forme de latex) : 10 parts PVA : 0,5 part Azurant optique : 0,3 part On this coated paper of 150 g / m 2, by curtain coating in an amount of 8 g / m 2 dry weight per face, a layer of a pigmented composition prepared in aqueous medium, comprising, by dry weight parts per 100 parts in total dry weight of pigments: Calcium carbonate : 47 shares Kaolin: 47 shares Amorphous synthetic silica: 1 part Plastic pigments: 5 parts (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 μm and 0.2 μm) Binder styrene-butadiene copolymer (used in latex form): 10 parts PVA: 0.5 part Optical brightener: 0.3 shares

On obtient ainsi un papier couché formé d'une base fibreuse (à base de fibres de cellulose) revêtue de trois sous-couches pigmentées et d'une couche de surface pigmentée comportant une faible quantité de silice.This gives a coated paper formed of a fibrous base (based on cellulose fibers) coated with three pigmented sub-layers and a pigmented surface layer comprising a small amount of silica.

Le papier couché obtenu est calandré. Il a un niveau de brillance de 85, mesuré à 75 degrés.The coated paper obtained is calendered. It has a gloss level of 85, measured at 75 degrees.

Le papier a un lissé BEKK recto/verso de 4108/4086 secondes et une perméabilité à l'air (appareil vase de Mariotte) mesurée selon la norme française AFNOR NF-Q-03-075 de 10.10-3 cm3/(m2.Pa.s).The paper has a BEKK smoothness of 4108/4086 seconds and an air permeability (vessel vase Mariotte) measured according to the French standard AFNOR NF-Q-03-075 of 10.10 -3 cm 3 / (m 2 .Not).

On teste ce papier par impression offset sur une machine ROLAND 4 couleurs. Le temps de séchage de l'impression est de 20 minutes.This paper is tested by offset printing on a ROLAND 4-color machine. The drying time of the print is 20 minutes.

EXEMPLE 4 : Papier ultra brillant selon l'invention :EXAMPLE 4 High Gloss Paper According to the Invention

On fabrique un papier couché (base fibreuse revêtue de trois couches pigmentées successives) de 170 g/m2 commercialisé par le groupe ARJOWIGGINS sous la marque CHROMOMAT® 170 g/m2.A coated paper (fibrous base coated with three successive pigmented layers) of 170 g / m 2 sold by the ARJOWIGGINS group under the trademark CHROMOMAT® 170 g / m 2 is manufactured .

Sur ce papier couché de 170 g/m2 , on dépose par couchage rideau, à raison de 9 g/m2 par face, une couche d'une composition pigmentée réalisée en milieu aqueux, comportant, en parts poids sec pour 100 parts en poids total sec de pigments : Carbonate de calcium : 45 parts (carbonate à 80% de pigments ayant une taille moyenne <1 µm) Silice synthétique amorphe (taille moyenne 5-6µm) : 5 parts Pigments plastiques : 50 parts (mélange de microsphères creuses d'un copolymère styrène-acrylique possédant une taille d'environ 0,6 µm et 0,2 µm) Liant copolymère styrène-butadiène (utilisé sous forme de latex) : 10 parts PVA : 0,5 part Azurant optique : 0,4 part On this coated paper of 170 g / m 2 , is deposited by curtain coating, at a rate of 9 g / m 2 per side, a layer of a pigmented composition made in an aqueous medium, comprising, in parts by dry weight for 100 parts in total dry weight of pigments: Calcium carbonate : 45 shares (carbonate with 80% of pigments having a mean size <1 μm) Amorphous synthetic silica (average size 5-6μm): 5 parts Plastic pigments: 50 shares (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 μm and 0.2 μm) Binder styrene-butadiene copolymer (used in latex form): 10 parts PVA: 0.5 part Optical brightener: 0.4 shares

Le papier obtenu est calandré. Il a un niveau de brillance de 96, mesuré à 75 degrés. On teste ce papier par impression offset sur une machine ROLAND 4 couleurs, le temps de séchage de l'impression est de 15 minutes.The paper obtained is calendered. It has a gloss level of 96, measured at 75 degrees. This paper is tested by offset printing on a ROLAND 4-color machine, the drying time of the printing is 15 minutes.

EXEMPLE 5 : Papier ultra brillant comparatif (sans silice)EXAMPLE 5 Comparative High Gloss Paper (Without Silica)

On fabrique un papier couché CHROMOMAT ®de 170 g/m2 comme dans l'exemple 4.A CHROMOMAT ® coated paper of 170 g / m 2 is manufactured as in Example 4.

Sur ce papier couché de 170 g/m2, on dépose par couchage rideau, sur chaque face, à raison de 9 g/m2 en sec et par face, une couche d'une composition pigmentée dépourvue de silice.On this coated paper of 170 g / m 2 , is deposited by curtain coating, on each side, at a rate of 9 g / m 2 dry and per side, a layer of a pigmented composition without silica.

En effet, cette composition pigmentée comporte, en parts poids sec pour 100 parts en poids total sec de pigments : Carbonate de calcium : 50 parts (carbonate à 80% de pigments ayant une taille moyenne < 1µm) Pigments plastiques : 50 parts (mélange de microsphères creuses d'un copolymère styrène-acrylique possédant une taille d'environ 0,6 µm et 0,2 µm) Liant copolymère styrène-butadiène (utilisé sous forme de latex) : 10 parts PVA : 0,5 part Azurant optique : 0,4 part Indeed, this pigmented composition comprises, in parts by dry weight for 100 parts in total dry weight of pigments: Calcium carbonate : 50 shares (carbonate with 80% of pigments having an average size <1 μm) Plastic pigments: 50 shares (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 μm and 0.2 μm) Binder styrene-butadiene copolymer (used in latex form): 10 parts PVA: 0.5 part Optical brightener: 0.4 shares

Le papier couché ainsi obtenu est calandré. Il a un niveau de brillance de 100, mesuré à 75 degrés.The coated paper thus obtained is calendered. It has a gloss level of 100, measured at 75 degrees.

On teste ce papier couché par impression offset sur une machine ROLAND 4 couleurs, le temps de séchage de l'impression est de 45 minutes.This coated paper is tested by offset printing on a ROLAND 4-color machine, the drying time of the printing is 45 minutes.

En comparaison, le papier couché ultra brillant avec la silice selon l'invention (exemple 4) a donc permis de diminuer le temps de séchage de 30 minutes.In comparison, the ultra-glossy coated paper with the silica according to the invention (Example 4) thus made it possible to reduce the drying time by 30 minutes.

EXEMPLE 6 : Papier irisé selon l'inventionEXAMPLE 6 Iridescent paper according to the invention

Sur un papier couché (base fibreuse revêtue de trois couches pigmentées successives) CHROMOMAT® de 120 g/m2, on dépose par couchage rideau, sur chaque face, à raison de 3 g/m2 en sec par face, une composition pigmentée irisée réalisée en milieu aqueux, comportant, en parts poids sec pour 100 parts en poids total sec de pigments : Pigments iridescents du type mica enrobé de titane : 35 parts Silice synthétique amorphe (taille moyenne 5-6µm) : 11 parts Pigments plastiques : 54 parts (mélange de microsphères creuses d'un copolymère styrène-acrylique possédant une taille d'environ 0,6 µm et 0,2 µm) PVA : 20 parts On a coated paper (fibrous base coated with three successive pigmented layers) CHROMOMAT® of 120 g / m 2 , was deposited by curtain coating, on each side, at a rate of 3 g / m 2 dry per face, an iridescent pigmented composition carried out in an aqueous medium, comprising, in parts by dry weight per 100 parts by total dry weight of pigments: Iridescent pigments of the mica type coated with titanium: 35 shares Amorphous synthetic silica (average size 5-6μm): 11 parts Plastic pigments: 54 shares (mixture of hollow microspheres of a styrene-acrylic copolymer a size of about 0.6 μm and 0.2 μm) PVA: 20 parts

Le papier obtenu est calandré. Il a un niveau de brillance de 55, mesuré à 75 degrés Le papier a un lissé BEKK recto/verso de 496/467 secondes et une perméabilité à l'air (appareil vase de Mariotte) mesurée selon la norme française AFNOR NF-Q-03-075 de 14.10-3 cm3/(m2.Pa.s)The paper obtained is calendered. It has a gloss level of 55, measured at 75 degrees. The paper has a BEKK smoothness of 496/467 seconds and an air permeability (vessel vase of Mariotte) measured according to the French standard AFNOR NF-Q- 03-075 of 14.10 -3 cm 3 / (m 2 .Pa.s)

On teste ce papier par impression offset sur une machine ROLAND 4 couleurs. Le temps de séchage des encres est de l'ordre de 30 minutes.This paper is tested by offset printing on a ROLAND 4-color machine. The drying time of the inks is of the order of 30 minutes.

EXEMPLE 7 comparatif d'un papier irisé (sans silice) :EXAMPLE 7 Comparative of Iridescent Paper (Without Silica):

Sur un papier CHROMOMAT® 120 g/m2, on dépose comme dans l'exemple 6 par couchage rideau, à raison de 3 g/m2 en sec par face, une couche d'une composition pigmentée irisée mais celle-ci est dépourvue de silice.On paper CHROMOMAT® 120 g / m 2 is deposited as in Example 6 by curtain coating at a rate of 3 g / m 2 dry weight per face, a layer of a pigmented composition iridescent but it lacks of silica.

Ladite composition pigmentée irisée réalisée en milieu aqueux, comporte, en parts poids sec pour 100 parts en poids total sec de pigments : Pigments iridescents du type mica enrobé de titane : 35 parts Pigments plastiques : 65 parts (mélange de microsphères creuses d'un copolymère styrène-acrylique possédant une taille d'environ 0,6 µm et 0,2 µm) PVA : 20 parts Said iridescent pigmented composition produced in an aqueous medium, comprises, in parts by dry weight per 100 parts by total dry weight of pigments: Iridescent pigments of the mica type coated with titanium: 35 shares Plastic pigments: 65 shares (Hollow microsphere mixture of a styrene-acrylic copolymer having a size of about 0.6 μm and 0.2 μm) PVA: 20 parts

Le papier couché ainsi obtenu est calandré. Il a un niveau de brillance de 58, mesuré à 75 degrés.The coated paper thus obtained is calendered. It has a gloss level of 58, measured at 75 degrees.

On teste ce papier par impression offset sur une machine ROLAND 4 couleurs. Le temps de séchage des encres est de plusieurs heures.This paper is tested by offset printing on a ROLAND 4-color machine. The drying time of the inks is several hours.

TESTS et RESULTATS :TESTS and RESULTS:

Les encres offset traditionnelles utilisées pour les tests de tous les exemples sont des encres offset semi-fraîches de la série OPTIMA de la société LORILLEUX, qui sèchent à l'air libre.The traditional offset inks used for the tests of all the examples are semi-fresh offset inks of the OPTIMA series of the company LORILLEUX, which dry in the open air.

Pour déterminer le temps de séchage des encres, on détermine à partir de quel temps de séchage il n'y a plus de report d'encre sur la face d'un autre papier identique. Pour cela on superpose la face imprimée et testée du papier sur la face vierge (non imprimée) d'un autre papier identique (la face vierge étant revêtue de la même composition pigmentée), puis à l'aide d'une presse ERICHSEN® on applique sur la face opposée à la face testée une pression définie (force de 200 Newtons) à l'aide d'un piston calibré (de 4 cm diamètre). On note à partir de quel temps de séchage à l'air libre, la marque d'encre induite par le piston ne se reporte plus sur la face vierge.In order to determine the drying time of the inks, it is determined from what drying time there is no longer any ink transfer on the face of another identical paper. For this, the printed and tested side of the paper is superimposed on the blank (non-printed) side of another identical paper (the virgin side is coated with the same pigmented composition), and then with the aid of an ERICHSEN® on applies a defined pressure (force of 200 Newtons) on the face opposite to the tested face using a calibrated piston (4 cm diameter). It is noted from what time of drying in the open air, the ink mark induced by the piston no longer refers to the blank face.

Tous ces exemples montrent que la silice améliore nettement le temps de séchage des encres. De plus l'ajout de silice permet d'incorporer des taux de pigments plastiques élevés dans la composition de revêtement et ainsi d'obtenir des papiers ultra brillants aptes à une impression offset avec des temps de séchage rapides pour des encres traditionnelles.All these examples show that the silica significantly improves the drying time of the inks. In addition, the addition of silica makes it possible to incorporate high levels of plastic pigments into the coating composition and thus to obtain high gloss papers suitable for offset printing with fast drying times for traditional inks.

Par ailleurs la rhéologie des compositions pigmentées avec la silice utilisée dans les exemples n'a pas été affectée par rapport aux compositions sans silice des exemples comparatifs lors de leur mise en oeuvre dans le procédé de couchage.Moreover, the rheology of the compositions pigmented with the silica used in the examples was not affected with respect to the silica-free compositions of the comparative examples when they were used in the coating process.

Claims (24)

  1. Offset printing process using a coated paper printable by offset printing with conventional airdrying offset inks, characterised in that it comprises, on at least one of its faces, a printable surface layer formed from a pigmented composition containing at least one binder and pigments, including silica pigments in an amount comprised between 0.1 and 15% of the total dry weight of pigments of said composition, and as pigments other than silica, pigments chosen from calcium carbonates, kaolins, talc, titanium dioxide, plastic coating pigments, special pigments having an optical and/or decorative effect, and mixtures thereof.
  2. Process as claimed in claim 1, characterised in that the coated paper comprises, on at least one of its faces, at least one sublayer of pigmented composition containing pigments and at least one binder, which is placed beneath said surface layer.
  3. Process as claimed in one of claims 1 to 2, characterised in that the amount of silica, by dry weight, in said surface layer is comprised between 0.5 and 11% of the total dry weight of pigments of said pigmented composition.
  4. Process as claimed in any one of claims 1 to 3, characterised in that said paper is printable with said offset inks with a drying time of less than 40 minutes.
  5. Process as claimed in any one of claims 1 to 4, characterised in that the silica is an amorphous synthetic silica.
  6. Process as claimed in any one of claims 1 to 5, characterised in that the binder of said surface layer is chosen from polyvinyl alcohols, styrene/butadiene copolymers, and mixtures thereof.
  7. Process as claimed in any one of claims 1 to 6, characterised in that the dry weight of said surface layer is between 2 and 20 g/m2, per side.
  8. Process as claimed in any one of claims 1 to 7, characterised in that said plastic pigments are hollow microspheres of a styrene/acrylic copolymer having a mean size of between 1 and 0.1 µm.
  9. Process as claimed in any one of claims 1 to 8, characterised in that said special pigments having an optical and/or decorative effect are iridescent pigments.
  10. Process as claimed in claim 9, characterised in that the binder of said surface layer is a polyvinyl alcohol, preferably with a content of between 10% and 30% by dry weight, relative to the total dry weight of pigments of said composition.
  11. Process as claimed in one of claims 9 or 10, characterised in that said surface layer contains between 5 and 15% silica by dry weight, relative to the total dry weight of pigments of said pigmented composition.
  12. Process as claimed in one of claims 9 to 11, characterised in that said pigmented composition of the surface layer contains at least 50% of plastic pigments by dry weight, relative to the total dry weight of pigments.
  13. Process as claimed in one of claims 9 to 12, characterised in that the coated paper is printable with a drying time of said offset inks of 30 minutes or less.
  14. Process as claimed in one of claims 1 to 7, characterised in that said surface layer comprises between 1 and 5% of silica by dry weight, relative to the total dry weight of pigments of the composition, and in that the coated paper has a degree of gloss, measured at 75° according to the international standard ISO 2813, of 20 or less.
  15. Process as claimed in preceding claim 14, characterised in that the coated paper has a degree of gloss, measured at 75° according to the ISO 2813 standard, of 15 or less, preferably equal to 13 or less.
  16. Process as claimed in one of claims 14 or 15, characterised in that the coated paper is printable with a drying time of said offset inks of 15 minutes or less.
  17. Process as claimed in one of claims 1 to 8, characterised in that said surface layer comprises between 1% and 10% silica by dry weight, relative to the total dry weight of pigments of the composition, and in that the coated paper has a degree of gloss, measured at 75° according to the ISO 2813 standard, of 70 or more.
  18. Process as claimed in preceding claim 17, characterised in that said surface layer contains at least 5% of plastic pigments by dry weight, relative to the total dry weight of pigments.
  19. Process as claimed in claim 18, characterised in that the coated paper has a degree of gloss, measured at 75° according to the ISO 2813 standard, of 90 or more.
  20. Process as claimed in claim 19, characterised in that said pigmented composition contains at least 30%, preferably at least 50%, of plastic pigments by dry weight, relative to the total dry weight of pigments.
  21. Process as claimed in one of claims 17 to 20, characterised in that the coated paper is printable with a drying time of said offset inks of 20 minutes or less.
  22. Process as claimed in any one of the preceding claims, characterised in that the coated paper is coated on both its sides with said surface layer.
  23. Process as claimed in claim 2 et seq., characterised in that said sublayer contains pigments chosen from calcium carbonates, kaolins, talc, titanium dioxide, plastic coating pigments, special pigments having an optical and/or decorative effect, and mixtures thereof.
  24. Process as claimed in claim 2 et seq., characterised in that said sublayer contains a binder chosen from polyvinyl alcohols, starches, styrene/butadiene copolymers, and mixtures thereof.
EP05783927A 2004-06-24 2005-06-24 Offset printing process Not-in-force EP1761672B1 (en)

Applications Claiming Priority (2)

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FR0406923A FR2872180A1 (en) 2004-06-24 2004-06-24 PAPER COATED WITH A PIGMENTED COMPOSITION COMPRISING OFFSET PRINTING SILICA
PCT/FR2005/001594 WO2006010827A1 (en) 2004-06-24 2005-06-24 Paper coated with a surface layer comprising offset-printable silica

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JP5730823B2 (en) * 2012-07-03 2015-06-10 Ｋｊ特殊紙株式会社 Decorative board base paper and decorative board
FR2999617A1 (en) * 2012-12-18 2014-06-20 Arjowiggins Security INFORMATION SUPPORT FOR PRINTING ON OFFSET PRESSES.
CN103726396B (en) * 2013-12-18 2016-08-17 安徽华邦特种材料有限公司 A kind of production method of high-stiffness thermal transfer body paper
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CN107972378B (en) * 2017-11-14 2019-10-18 温州富捷科技股份有限公司 A kind of cardboard printing technique

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FR2872180A1 (en) 2005-12-30
DE602005025874D1 (en) 2011-02-24
ATE495022T1 (en) 2011-01-15
WO2006010827A1 (en) 2006-02-02
BRPI0512620A (en) 2008-03-25
CN1973088A (en) 2007-05-30
US20080038553A1 (en) 2008-02-14

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