EP2516741B2 - Feuille imprimable ultra lisse et recyclable et son procédé de fabrication - Google Patents

Feuille imprimable ultra lisse et recyclable et son procédé de fabrication Download PDF

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Publication number
EP2516741B2
EP2516741B2 EP10809308.9A EP10809308A EP2516741B2 EP 2516741 B2 EP2516741 B2 EP 2516741B2 EP 10809308 A EP10809308 A EP 10809308A EP 2516741 B2 EP2516741 B2 EP 2516741B2
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EP
European Patent Office
Prior art keywords
layer
printable
face
sheet
substrate
Prior art date
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Application number
EP10809308.9A
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German (de)
English (en)
French (fr)
Other versions
EP2516741A1 (fr
EP2516741B1 (fr
Inventor
Gaël DEPRES
Jean-Marie Vau
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AW Branding Ltd
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AW Branding Ltd
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Publication of EP2516741A1 publication Critical patent/EP2516741A1/fr
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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/18—Paper- or board-based structures for surface covering
    • D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
    • 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
    • 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
    • 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
    • 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
    • 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
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/08—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH
    • D21H23/10—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH at least two kinds of compounds being added
    • 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
    • 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
    • D21H23/66—Treating discontinuous paper, e.g. sheets, blanks, rolls
    • 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
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • 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
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D21H23/72—Plural serial stages only
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/001—Release paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • D21H27/004—Tissue paper; Absorbent paper characterised by specific parameters
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Definitions

  • the present invention relates to a smooth or ultra-smooth and recyclable printable sheet, as well as its manufacturing process.
  • This sheet can be used in distinct fields such as those of packaging, electronics, optics, or the graphic arts, for example as a printing medium, in particular for a photographic image.
  • an ultra smooth sheet can be manufactured by laminating a plastic film on one side of a paper, this plastic film defining an ultra smooth side on the paper.
  • the base paper is formed from a fibrous material whose faces have a relatively high roughness, of the order of about 20 ⁇ m, that is to say that each of its faces is formed of bumps and hollows whose height which separates them is of the order of 20 ⁇ m.
  • the lamination of a plastic film on one face of such a paper makes it possible to give this face a very low roughness, of the order of 1 ⁇ m in the case of a PET (polyethylene terephthalate) film.
  • paper Since paper is a relatively expensive material and produced on a large scale, it is important that it be recyclable. However, a paper-based sheet, ultra smooth because comprising a plastic film, is not recyclable or is difficult to recycle, which is therefore neither ecological nor economical. Indeed, during the recycling of paper-based sheets, these sheets are crushed and mixed with water in a pulper to form a pulp. In the case where these sheets include plastic films, these films are shredded in the pulper and their plastic material pollutes the pulp.
  • Such an ultra smooth sheet is not printable and a printable resin must be deposited on the plastic film of the sheet to make it printable.
  • This technique is used in particular to manufacture paper-based sheets for printing photographic images (called resin-coated photographic papers ), these sheets comprising a PE (polyethylene) film and having a Bekk smoothness of the order from 6000s.
  • a smooth sheet can also be manufactured by depositing a coating composition on one side of a paper, this composition defining after drying a smooth side on the paper.
  • This technique makes it possible to manufacture a smooth sheet without plastic film.
  • the composition is deposited on the paper by a curtain coating technique, by dragging or scraping blade, by air knife, by gravure printing or even by rollers ( size press, film press, etc.)
  • the face of the base paper, on which the coating composition is deposited comprises an alternation of hollows and bumps, the hollows being filled with the coating composition and the bumps being flattened during coating, which makes it possible to reduce the roughness of the paper.
  • this technique does not make it possible to obtain a sheet as smooth as a sheet covered with a plastic film, even if this sheet is subsequently smoothed, for example by calendering.
  • the method currently used for making a smooth and glossy sheet consists in depositing a coating composition on a base paper by means of a mechanical roller, the cylindrical surface of which is very smooth and covered with a layer of chromium.
  • the Bekk smoothness of a sheet obtained by this process is of the order of 50 s and is therefore however lower than that of a sheet comprising a plastic film (of the order of 6000 s in the case of a PE film) .
  • the object of the invention is in particular to provide a simple, effective and economical solution to the problems of the prior techniques.
  • a smooth sheet also called ultra smooth within the meaning of the invention, the smoothness of this sheet being independent of the roughness of the paper or more generally of the base substrate used, and the sheet does not comprising no plastic film and therefore being at least partly recyclable, or even biodegradable.
  • the multilayer structure is prepared prior to the implementation of the process for manufacturing the printable sheet.
  • the multilayer structure is provided for carrying out the process for manufacturing the printable sheet.
  • the smooth or ultra-smooth face of the sheet is defined by a printable layer which is prepared on a plastic film called a “donor”, said printable layer being, at this stage, included in a multilayer structure, then is transferred. on the base substrate called "receiver".
  • the smoothness of the printable layer and therefore of the sheet is induced by that of the plastic film of the multilayer structure, and therefore does not depend on that of the base substrate used.
  • the invention therefore makes it possible to transfer the surface state of a plastic film onto any substrate.
  • the invention makes it possible to manufacture a smooth or ultra-smooth sheet from any substrate, such as advantageously a rough paper and / or having a relatively large hand, for example greater than or equal to 1.10 cm 3 / g, and without including a plastic film in the sheet thus produced.
  • the sheet prepared by the process according to the invention is therefore both printable and recyclable.
  • printable sheet and by substrate intended for the preparation of the printable sheet is meant a thin element (the thickness of which does not exceed 500 ⁇ m), preferably flexible and / or flexible.
  • printable sheet or layer is meant a sheet or layer that can be printed by any printing technique, and in particular by offset printing, inkjet, laser, gravure, fléxo, dry toner, liquid toner, electrophotography, lithography. , etc.
  • a printable layer typically comprises a mixture of pigments and at least one binder, or is formed of a printable varnish based on polymer (s) of the acrylic, vinyl, polyurethane, styrenic, starch or polyvinyl alcohol type. , ethylene, or a mixture of these polymers.
  • the ink is intended to be deposited on the smooth or ultra-smooth free face of the printable sheet or of the printable layer.
  • the term “recyclable sheet” is understood to mean a sheet which is free from plastic film, for example made from thermoplastic or thermosetting material.
  • the printing of the printable layer does not cause any structural modification thereof, and in particular a change of state or phase thereof (such as for example a passage from a solid state to a liquid state then return to the solid state).
  • a multilayer structure of the invention prepared or supplied within the scope of the process according to the invention comprises in particular, or consists of, a lower plastic film, an intermediate non-stick layer and a printable upper layer.
  • the release layer covers at least part of the top side of the plastic film, and the printable layer covers at least part of the top side of the release layer.
  • the plastic film serves as a manufacturing support for the printable layer. This film does not remain in the final product, namely the sheet, which is therefore recyclable.
  • the upper face of the film (located on the side of the printable layer) is advantageously as smooth as possible, since the surface quality of the smooth face of the sheet, defined by the printable layer, is a function of the surface quality of this face top of the plastic film. In other words, the smoother the plastic film of the multilayer structure, the smoother the sheet obtained.
  • the plastic film is chosen from a film of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polymer based on polylactic acid (PLA), any polymer based on cellulose, etc.
  • PET polyethylene terephthalate
  • PE polyethylene
  • PP polypropylene
  • PLA polylactic acid
  • the film has for example a thickness of the order of 12 ⁇ m.
  • the plastic film is free and / or is not covered with PVDF (polyvinylidene fluoride), PP (polypropylene), teflon, silica, boron nitride, stearo chromium chlorides or any other product having non-stick / non-stick properties.
  • PVDF polyvinylidene fluoride
  • PP polypropylene
  • teflon silica
  • boron nitride boron nitride
  • stearo chromium chlorides any other product having non-stick / non-stick properties.
  • the film face located on the printable layer side is preferably smooth and may have a Bekk smoothness greater than 10,000s Bekk.
  • the thickness, hardness and glass transition temperature of the plastic film have little or no influence on the characteristics of the printable layer. Only the smoothness, or conversely, the roughness of the plastic film has an influence on the smoothness or roughness of the printable layer. The smoother the plastic film, the smoother the printable layer. Those skilled in the art are, however, able to determine which characteristics of the plastic film are liable to influence the surface condition of the printable layer, and to optimize these characteristics as a function of the final smoothness that it is desired to obtain for this. printable layer.
  • the non-stick layer of the multilayer structure is deposited on the plastic film by any technique, for example by gravure printing.
  • the function of this release layer is to limit the adhesion of the printable layer to the plastic film and to facilitate the separation and removal of the plastic film from the printable layer in step c / of the process defined above.
  • the non-stick layer does not or only slightly modify the smoothness and the surface quality of the face plastic film, on which this layer is deposited.
  • the release layer can adhere more to the plastic film than to the printable layer, so that a major part or even all of this release layer remains stuck on the plastic film, when it is removed from the printable layer. However, parts or traces of this release layer may persist on the printable layer after removing the plastic film.
  • the release layer can adhere more to the printable layer than to the plastic film, and is then intended to remain at least partially on the printable layer during the removal of the plastic film.
  • the release layer is intended to substantially divide into two parts upon removal of the plastic film, a first part remaining on the plastic film and a second part remaining on the printable layer.
  • the multilayer structure can include two non-stick layers superimposed between the plastic film and the printable layer, these two layers being intended to separate from each other during the removal of the plastic film (one of the non-stick layers remaining on the plastic film and the other non-stick layer remaining on the printable layer).
  • Leaving part or all of a release layer on the printable layer is particularly advantageous when the sheet is intended to be used as a support in a casting application.
  • the casting application consists in extruding and casting at least one polymer (such as polyurethane (PU), polyvinyl chloride (PVC), etc.) on a support coated with a non-stick layer.
  • This polymer can have a textured surface to give the sheet a particular appearance (eg, similar to leather).
  • the fact of leaving a non-stick layer on the sheet according to the invention avoids having to redeposit such a layer on this sheet for a casting application, and is therefore advantageous in particular in terms of cost and time of preparation of the support for the coating. casting application.
  • the non-stick layer has a thickness less than or equal to 5 ⁇ m and preferably to 1 ⁇ m.
  • the non-stick layer can be composed of silicone (s), siloxane (s), polysiloxane (s) or its derivatives, Werner complex (s), such as chromium stearochlorides, or polyethylene waxes, propylene waxes, polyurethane, polyamide, polytetrafluoroethylene, etc.
  • the non-stick layer does not include PVDF.
  • the printable layer of the multilayer structure can be chosen from a printable varnish, a paper coating, etc.
  • printable varnish is meant a substance based on acrylic polymer, polyurethane, polymethyl methacrylate, styrene butadiene, vinyl acetate, polyamide, nitrocellulose or any other cellulose, polyvinyl alcohol, d starch, etc. This substance is generally deposited in liquid form and solidified by drying / heating or by UV or electronic radiation.
  • paper coating or coating composition is understood to mean a composition comprising a binder and pigments.
  • the binder may be based on acrylic, polyurethane, polymethyl methacrylate, styrene butadiene, vinyl acetate, polyamide, nitrocellulose or any other cellulose, polyvinyl alcohol, starch, or a mixture of these. this.
  • the pigments can be chosen from calcium carbonates, kaolins, titanium dioxide, talc, silicas, mica, and pearly particles, plastic pigments (polystyrene (PS), polyurethane (PU), etc.), and their mixtures.
  • the level of binder relative to the pigments is between 5 and 50% approximately, and preferably between 8 and 25%, by dry weight.
  • Pigments are generally in the majority compared to the binder in a papermaking coating, in order to create porosities which improve ink absorption.
  • the binders are in the majority compared to the pigments because the objective is not to have surface porosity.
  • the plastic material used in the printable layer (as a binder and / or pigments) is easily fragmented and does not pollute the pulp when it is recycled. On the contrary, the plastic films keep a cohesion and clog the filters during the resuspension of the paper pulp.
  • Water-soluble binders (such as starch, polyvinylalcohol (PVA), etc.) are particularly advantageous in this regard because they disperse in water during recycling.
  • the papermaking coating may further comprise a dispersant and / or a rheological modifier and / or a colorant and / or a surfactant or spreader and / or a conductive additive.
  • This conductive additive can be used to reduce the surface resistivity of the sheet.
  • the printable layer is free from an anti-adhesive agent and / or product capable of reducing the surface energy of the layer, such as a silicone material or the like, PVDF, PP, Teflon, silica. , boron nitride, etc.
  • an anti-adhesive agent and / or product capable of reducing the surface energy of the layer such as a silicone material or the like, PVDF, PP, Teflon, silica. , boron nitride, etc.
  • This type of agent or product may be necessary for one-layer thermal transfer printing, in particular to prevent paper from adhering to the printer ribbon.
  • the printable layer according to the invention may therefore not be printable by thermal transfer.
  • the printable layer can be formed from several sublayers superimposed on one another, each sublayer being printable and being chosen from the aforementioned types (printable varnish, papermaking coating, etc.).
  • the printable layer may have a thickness less than or equal to 30 ⁇ m, preferably less than or equal to 15 ⁇ m, and more preferably less than or equal to 10 ⁇ m. Its weight is advantageously less than or equal at 30 g / m 2 , preferably less than or equal to 15 g / m 2 , and more preferably less than or equal to 10 g / m 2 .
  • the printable layer can for example have a thickness and a basis weight which are less than or equal to the following combined values: 10 .mu.m and 10 g / m 2, 3 microns and 10 g / m 2, 2 .mu.m and 10 g / m 2, 5 .mu.m and 5 g / m 2, 3 ⁇ m and 5g / m 2 , 2 ⁇ m and 5g / m 2 , 5 ⁇ m and 2g / m 2 , 3 ⁇ m and 2 ⁇ / m 2 , or 2 ⁇ m and 2 ⁇ / m 2 .
  • the printable layer can be deposited on the release layer by any technique, for example by gravure printing.
  • the printable layer can be deposited on the non-stick layer in the liquid or semi-liquid state and then be solidified by drying, heating, or by UV or electronic radiation. After solidification and / or drying, the printable layer, which is in contact with the smooth face of the plastic film via the release layer, has a smooth face, located on the side of the plastic film.
  • the printable layer is therefore dried and / or solidified before its transfer to the substrate, in particular so as not to modify the surface state of this layer provided by the plastic film.
  • the multilayer structure is prepared prior to the transfer of the printable layer to the substrate, and the printable layer is in the solid and / or dry state during its transfer to the substrate, that is to say in steps b / and c / of the method according to the invention.
  • the surface condition of the printable layer is therefore created during the preparation of the multilayer structure.
  • the manufacture of the printable layer is therefore carried out independently of that of the base substrate.
  • the method comprises, before step a, a preliminary step consisting in producing, for example by engraving, hollow and / or raised patterns on the face of the plastic film intended to receive the non-stick layer and the printable layer, the printable layer being intended to match the shape of these patterns so as to include an imprint of the aforementioned face of the plastic film.
  • the multilayer structure can comprise at least one additional layer deposited on the printable layer, on the side opposite to the plastic film, the free face of this additional layer or of the additional layer furthest from the plastic film being intended, in step b / , to be glued and applied against the aforementioned face of the substrate.
  • the additional layer (s) may or may not be functional. They can for example be insulating (dielectric) or form a barrier (to gases, for example to oxygen, to liquids, for example to water, to greases, etc.).
  • the multilayer structure comprises a single additional layer
  • it is deposited on the upper face of the printable layer, that is to say on the face of the printable layer, located on the side opposite the plastic film of the multilayer structure.
  • This additional layer can be of any kind, and is therefore not necessarily printable.
  • these additional layers are superimposed on each other and deposited on the aforementioned upper face of the printable layer.
  • the technique (s) employed to deposit the additional layer (s) on the printable layer may be of the aforementioned types, or of any other type.
  • the multilayer structure can therefore comprise, in addition to the three aforementioned elements (a plastic film, a non-stick layer, and a printable layer), one or more additional layers, which are printable or not, on the printable layer (on the side opposite the plastic film ).
  • the multilayer structure may further comprise a layer or a film of adhesive covering the layer furthest from the plastic film (that is to say the printable layer or the additional layer (s)).
  • Step b / of the method according to the invention consists in gluing the face of the substrate intended to receive the printable layer, or the face of the multilayer structure, located on the side opposite to the plastic film, and in applying these faces against each other. the other, so as to fix them.
  • the substrate can be selected from paper, tracing paper, card stock, and coated or pre-coated paper.
  • the paper can have a relatively large hand greater than or equal to 1.10cm 3 / g, preferably greater than or equal to 1.2cm 3 / g, more preferably greater than or equal to 1.3cm 3 / g, more particularly greater than or equal to at 1.4cm 3 / g, and even more particularly greater than or equal to 1.5cm 3 / g.
  • the method according to the invention makes it possible to produce a sheet having both high hand and smoothness, which was not possible with the prior art. It was indeed not possible in the prior art to produce a sheet with a large hand and a high surface quality.
  • a substrate having a large hand can be formed from an inexpensive material.
  • the paper pulp used can comprise cellulose fibers, a binder, and a small proportion of fillers and / or adjuvants, such as starch.
  • the method according to the invention results in a slight decrease, from about 2 to 5%, in the handling of the paper substrate.
  • a smooth or ultra smooth sheet and having a large hand, produced with the method according to the invention has good printability and low basis weight, which allows packaging to be produced which are light but having relatively high rigidity.
  • step b / of the process the face to be coated with the substrate or the free face of the printable layer or of an additional layer of the multilayer structure, is glued using an appropriate glue.
  • the aforementioned two faces of the substrate and of the multilayer structure are glued simultaneously, or one after the other.
  • the sizing consists in depositing a layer of adhesive on the aforementioned face (s), by any technique, such as, for example, by gravure printing.
  • the glue can be of the thermal, non-thermal, UV crosslinking or chemical reaction type.
  • the glue can be deposited on the or on each aforementioned face in liquid or non-liquid form (in the case for example of a thermoadhesive film).
  • This adhesive is, for example, chosen from the following polymers: acrylic, polyurethane, polymethyl methacrylate, styrene butadiene, vinyl acetate, polyamide, nitrocellulose or any other cellulose, polyvinyl alcohol or starch.
  • the or each layer of adhesive deposited may have a thickness less than or equal to 10 ⁇ m, and preferably less than or equal to 3 ⁇ m.
  • the glue is deposited on the aforementioned face of the multilayer structure during the preparation of this structure. This glue is then an integral part of the multilayer structure.
  • the glue can be formed by a heat-activatable adhesive layer, this layer being activated by heating during the application of the multilayer structure on the substrate (receiver).
  • the nature of the glue and the gluing process can have a significant influence on the final surface finish of the paper. For example, it is important for the adhesive to be deposited uniformly and to avoid the formation of cavities between the paper and the printable layer.
  • the deposit of the adhesive is preferably homogeneous to avoid excess and / or lack of adhesive in places, which would result in a final sheet having surface roughness.
  • the glue spreads perfectly on the support (film or paper) while having an adequate surface tension and rheology.
  • the way the glue is coated can also be important.
  • the coating methods which generate the least possible deposit heterogeneity, such as gravure (reverse roll or kiss coating) are preferred.
  • the deposit is preferably chosen to fill the pores or surface irregularities of the paper as much as possible.
  • a deposit of adhesive having a thickness of at least 10 ⁇ m is preferable to fill the pores.
  • the glue is preferably deposited on the paper when the latter is too rough. If the deposit on the paper is insufficient, then cavities form between the surface of the paper and the printable layer. During printing, these cavities will become points of weakness in the paper which can then either sink in, if you exert pressure, or tear off, if you exert traction.
  • the thickness of adhesive deposited on the paper and / or the printable layer is equal to at least half of the average surface roughness (for example Ra or Sa) of the paper.
  • the adhesive is deposited on at least one face of the substrate in step b /, and the thickness of the adhesive layer deposited is at least equal to half of the average roughness of the face of the substrate, and is preferably equal to this average roughness.
  • the glue can be water-based, solvent-free, solvent-free, two-component or one-component.
  • the glue makes it possible to fix the printable layer (or an additional layer) on the substrate and, if necessary, to compensate for the surface irregularities of the substrate.
  • the glue fills in particular the hollows of the face to be coated with the substrate and therefore makes it possible to flatten this face, without however modifying the characteristics of the substrate, such as its hand.
  • Step b / of the process then consists in applying the aforementioned face of the substrate to the aforementioned face of the multilayer structure, so as to laminate them or to laminate them.
  • the printable layer is then sandwiched between on the one hand the substrate and the adhesive (and if necessary one or more additional layers), on the one hand, and on the other hand the plastic film and the non-stick layer, on the other hand. 'other side.
  • the application of the substrate to the multilayer structure is carried out hot, at a given temperature, which is for example between 50 and 200 ° C. about.
  • a given temperature which is for example between 50 and 200 ° C. about.
  • the application and bonding of the substrate to the multilayer structure can be carried out at room temperature.
  • a slight pressure may be necessary to ensure good adhesion of the printable layer on the substrate, by means of the adhesive.
  • the temperature and / or the pressure used during application and bonding must not, however, modify the characteristics of the printable layer, and in particular the surface condition of its face located on the side of the plastic film.
  • the printable layer should not be softened by the application of a high temperature, as this could lead to a modification and / or a decrease in the surface quality of its face, located on the side of the plastic film.
  • Step c / of the process then consists in removing the plastic film from the printable layer and from the substrate, so that the printable layer (and where appropriate the aforementioned additional layer (s) of the multilayer structure) remain on the substrate .
  • the printable layer, and where appropriate the additional layer or layers, are therefore transferred from the plastic film called donor, of the multilayer structure, onto the substrate called recipient.
  • the non-stick layer can remain on the plastic film and is then removed from the printable layer, during the removal of the plastic film.
  • the face of the printable layer, which was located on the side of the plastic film in the multilayer structure, is therefore exposed, this face defining the smooth face of the sheet.
  • the transfer of the printable layer from the multilayer structure onto the substrate, in steps b / and c / of the process, can be carried out as follows, when the substrate and the multilayer structure are in the form of continuous bands.
  • the lamination or lamination of the multilayer structure and of the substrate can be carried out by passing these two elements between two parallel and adjacent mechanical rollers, rotating in opposite directions.
  • the thickness of the product obtained depends in particular on the distance between the rollers.
  • the method may further consist in that, before step b /, the aforementioned face of the substrate is precoated with at least one smoothing layer comprising one or more thermoplastic polymers (such as at least one polystyrene, a polyurethane, a acrylic, etc.) or a mixture of pigments (such as kaolins, calcium carbonates, talc, titanium dioxide, etc., and mixtures thereof) and at least one binder (such as based on acrylic, polyurethane, polymethylmethacrylate, styrene butadiene, vinyl acetate, polyamide, nitrocellulose or any other cellulose, starch or PVA).
  • thermoplastic polymers such as at least one polystyrene, a polyurethane, a acrylic, etc.
  • a mixture of pigments such as kaolins, calcium carbonates, talc, titanium dioxide, etc., and mixtures thereof
  • binder such as based on acrylic, polyurethane, polymethylmethacrylate, st
  • This precoated face of the substrate can also be calendered, before step b /, to increase its smoothness.
  • the method according to the invention can comprise an additional step consisting in printing the sheet with an ink having electrical and / or optical properties.
  • the present invention further relates to a process for preparing a multilayer structure comprising at least, or constituted by, a plastic film, a release layer, and a printable layer, the release layer being interposed between the plastic film and the printable layer.
  • the present invention also relates to a method of printing a sheet prepared by the method described above, this method comprising a step of printing the sheet without modifying the state of its printable layer, that is to say without softening or melting of this layer during printing.
  • the sheet is for example printed by offset, inkjet, laser, gravure, flexo, dry toner, liquid toner, electrophotography, lithography, etc.
  • the layer for casting application is for example a layer of PVA.
  • the coating for casting application may have non-stick properties.
  • the present invention also relates to a printable sheet having at least one smooth face, and advantageously ultra smooth, this sheet comprising a substrate, in particular made of paper, at least one face of which is covered at least in part with one or more layers, of which a layer printable by offset printing, inkjet, laser, gravure, flexo, dry toner, liquid toner, electrophotography and / or lithography and defining said smooth or ultra smooth face, characterized in that this smooth or ultra smooth face has a Bekk smoothness greater than 2000 seconds, and more preferably greater than 5000 seconds and a gloss greater than 70%, and preferably greater than 80%, this gloss being measured at 75 ° according to the TAPPI T480 om-92 method.
  • the printable layer of the sheet may have a thickness less than or equal to 30 ⁇ m, preferably less than or equal to 15 ⁇ m, and more preferably less than or equal to 10 ⁇ m.
  • the basis weight of the printable layer may be less than or equal to 30 g / m 2 , preferably less than or equal to 15 g / m 2 , and more preferably less than or equal to 10 g / m 2
  • the printable layer may for example have a thickness and a thickness grammage which are less than or equal to the following combined values: 10 ⁇ m and 10g / m 2 , 3 ⁇ m and 10g / m 2 , 2 ⁇ m and 10g / m 2 , 5 ⁇ m and 5g / m 2 , 3 ⁇ m and 3g / m 2 , 2 ⁇ m and 5g / m 2 , 5 ⁇ m and 2g / m 2 , 3 ⁇ m and 2g / m 2 , or 2 ⁇ m and 2g / m 2
  • the present invention also relates to the use of a printable sheet as described above, for the production of an electronic and / or optical component, this sheet being printed by means of an ink having electrical and / or electrical properties. optics.
  • the sheet according to the invention can be compatible with organic electronic inks for applications electronic devices, such as, for example, the production of RFID ( Radio Frequency Identification ) chips, display or detection systems, etc., directly on the sheet.
  • electronic devices such as, for example, the production of RFID ( Radio Frequency Identification ) chips, display or detection systems, etc., directly on the sheet.
  • RFID Radio Frequency Identification
  • an RFID chip could be made on a sheet formed from a plastic film of polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • this plastic film has relatively low mechanical and temperature resistance, which limits the possible applications of the chip and prevents printing of the film with inks at relatively high temperatures.
  • the PET film is not easily recyclable.
  • the substrate of the sheet according to the invention is made of paper, this sheet has better mechanical strength and at high temperatures.
  • a sheet printed with an ink having electrical properties advantageously comprises a flexible substrate and a printable layer that is little or no electrically conductive.
  • This type of sheet can be used to make organic thin film transistors using organic conductive or semi-conductive inks.
  • the sheet according to the invention can also be used to produce optical components, such as waveguides, holographic patterns, etc.
  • the method defined above may comprise, before step a /, a preliminary step consisting in producing, for example by etching, hollow and / or raised patterns on the face of the plastic film intended for in receiving the release layer and the printable layer, the printable layer being intended to match the shape of these patterns so as to include an imprint of the aforementioned face of the plastic film.
  • the transfer of the surface condition of the film to the printable layer comprises both a transfer of the smoothness and the patterns of the plastic film.
  • the patterns transferred to the printable layer themselves have surfaces and / or walls having a smooth appearance and being precisely defined. This method is then particularly advantageous for the production of optical components of the aforementioned types.
  • the present invention finally relates to the use of a printable sheet as described above, for printing a photographic image, for producing packaging, and / or for a casting application.
  • FIG. 1 very schematically represents steps a /, b / and c / of the process according to the invention for manufacturing a smooth or ultra-smooth printable sheet 10 and fully recyclable.
  • Step a / of the process consists in preparing a multilayer structure 12 comprising a lower plastic film 14, a non-stick intermediate layer 16 and a printable upper layer 18.
  • the preparation of this structure 12 can be carried out in one step or in several successive steps.
  • the non-stick layer 16 and the printable layer 18 can be deposited simultaneously on the plastic film 14, by a curtain coating technique for example.
  • the non-stick layer 16 is deposited on the plastic film 14, then the printable layer 18 is deposited on the non-stick layer.
  • the surface quality of the upper face 20 of the plastic film 14 is transmitted to the lower face 22 of the printable layer 18 (via the release layer 16).
  • the surface characteristics of the face 22 of the printable layer are therefore defined by those of the face 20 of the plastic film 14.
  • the roughness of films and papers were tested using a topography measuring device of the ALTISURF 500 type from the company ALTIMET.
  • the first film tested has a roughness (for example Sa) of 1 ⁇ m.
  • This film was used to transfer a printable layer onto Bristol® paper from Arjowiggins.
  • the measured roughness of this printable layer is 1.1 ⁇ m.
  • the second film has a roughness of 0.5 ⁇ m.
  • This film was used to transfer a printable layer onto another Bristol® paper.
  • the measured roughness of this printable layer was 0.7 ⁇ m.
  • the roughness (or surface condition) of the film has therefore been transferred from the films to the printable layers.
  • the surface characteristics of the face 22 are fixed and are not intended to be modified during the other steps of the process, and in particular the transfer of the printable layer 18 onto a substrate 24. , such as paper, to be coated.
  • the printable layer 18 can be formed from a resin or a printable varnish or a papermaking coating comprising a binder and pigments.
  • the printable layer may include two or more sublayers which are chosen from a printable varnish and a paper coating.
  • the printable varnish is located above or below the paper coating, so that the aforementioned underside 22 of the printable layer is defined by printable varnish or paper coating.
  • Step b / of the method consists in depositing a layer or a film of adhesive 26 on the upper face 28 of the printable layer 18 or on the lower face 30 to be coated with the substrate 24, or even on these two faces 28, 30, then in applying these faces 28, 30 against each other in order to laminate or laminate the multilayer structure 12 and the substrate 24, and thus form a laminated or laminated product 32.
  • Step c / of the process consists in removing the plastic film 14 and the release layer 16 from the printable layer 18, so that only this layer 18 remains (with the glue 26) on the substrate 24.
  • steps b / and c / can be carried out simultaneously or one after the other.
  • the glue 26 is advantageously in the dry state and / or solidified during the removal of the plastic film 14.
  • step c / the face 22 of the printable layer 18 is exposed, this face being smooth or ultra smooth and having a Bekk smoothness greater than 2000 s.
  • part of the release layer 16 may remain on the face 22 of the printable layer 18 after the plastic film has been removed.
  • Layer 18 is printable by any suitable technique, the ink being intended to be deposited on the smooth or ultra-smooth face 22 of sheet 10.
  • the substrate 24 may be formed from a coated or precoated paper, that is to say a paper on one side of which a layer or precoat 33 is deposited, the latter comprising one or more thermoplastic polymers or a mixture. pigments and binder.
  • This layer or precoat 33 is intended to be deposited on the aforementioned face 30 of the substrate, and is advantageously smoothed by calendering. It is then intended to be glued to the face 28 of the printable layer 18.
  • the figure 2 represents an alternative embodiment of the method according to the invention, and differs from the method previously described with reference to figure 1 , in particular in that the multilayer structure 12 ′ further comprises at least one additional layer 34 deposited on the upper face 28 of the printable layer 18.
  • Additional superimposed layers 34 can be deposited (simultaneously or successively) on the face 28 of the printable layer 18.
  • Each of the additional layers 34 can be printable or non-printable.
  • step b / the lower face 30 of the substrate 24 or the free upper face 36 of the additional layer 34 (the furthest from the plastic film, in the case where the structure 12 ′ comprises several additional layers) is covered with glue 26.
  • these two faces 30, 36 are covered with glue 26.
  • step c / the multilayer structure 12 'and the substrate 24 are laminated or laminated, so as to form a laminated or laminated product 32', then the plastic film 14 and the release layer are removed, so as to put bare the smooth or ultra smooth face 22 of the printable layer 18 of the sheet 10 '.
  • the leaf of the figure 2 may include a substrate 24 precoated on its face 30, to increase its smoothness.
  • the precoat 33 is of the same type as that described with reference to figure 1 .
  • the figures 3 and 4 schematically represent means for implementing step c / transfer of the method according to the invention.
  • a first roller 40 is provided for driving a continuous strip of the multilayer structure 12 (formed of a plastic film 14, a non-stick layer 16 and a printable layer 18 - and possibly layer (s)) additional 34).
  • a second roller 42 parallel and adjacent to the first roller 40, is provided for driving a continuous strip of the substrate 24.
  • rollers 40, 42 rotate in opposite directions and are at a short distance from each other, the multilayer structure 12 and the substrate 24 being forced to pass between these rollers and being applied at a given pressure against each other. 'other, to ensure their lamination or lamination.
  • the glue 26 can be deposited on the multilayer structure 12 and / or the substrate 24, as indicated in the above, prior to this laminating step, or during this laminating step. In the latter case, the glue 26 can be injected between the structure 12 and the substrate, prior to their passage between the rollers, as is schematically represented by the double arrow in figure 3 .
  • a third roll 44 drives the sheet 10 formed by the substrate 24 and the printable layer 18 in one direction, while the plastic film 14 and the release layer 16 are driven in another direction to separate them from the sheet 10.
  • the figures 5 and 6 are images obtained by a scanning electron microscope (SEM) of a face of a paper or base substrate 24 and of a smooth or ultra-smooth face of a sheet 10, produced by the method according to the invention, respectively.
  • SEM scanning electron microscope
  • the base paper ( figure 5 ) is here formed of cellulosic fibers intermingled with each other and defining a rough face.
  • the roughness Sz of this face is of the order of 19.7 ⁇ m, which means that the maximum surface height, from the highest point to the deepest valley, is equal to 19.7 ⁇ m.
  • the sheet according to the invention ( figure 6 ) has a smooth or ultra-smooth face defined by its printable layer which has a roughness Sz of the order of 1.01 ⁇ m, the latter being comparable to that of a paper covered with a plastic film, according to the prior art, which has a roughness Sz of the order of 1.5 ⁇ m.
  • This roughness value of 1.01 ⁇ m of the sheet according to the invention is given as an indication and illustrates a particular embodiment of the invention.
  • Example 1 Preparation of a smooth or ultra smooth sheet printable by offset
  • a smooth or ultra smooth sheet according to the invention for offset printing was prepared, from a printable layer A having the following composition: Composition of layer A Pigments Calcium carbonate 1248g Hydrocarb ® 60 OG (Omya) Binder Aqueous dispersion of n-butyl acrylate-acrylonitrile-styrene copolymer 300g Acronal ® S504 (BASF) Dispersing Sulfoccinic acid - isooctyl ester, sodium salt 3g Agnique ® EHS 75E (Cognis) Rheological modifier Aqueous dispersion of acrylic copolymer 0.6g Sterocoll ® FD (BASF) Spreading agent Non-ionic surfactant 0.2g Surfynol ® 420 (Safic-Alcan)
  • Printable layer A has a final concentration by weight of 50% and a viscosity of 100cps, measured using a Brookfield® viscometer.
  • Layer A is applied to one side of a plastic film in PET, which is previously covered with a non-stick layer based on stearo chromium chloride.
  • the deposit of layer A on the film is approximately 10 g / m 2 .
  • Layer A is then dried in an oven at 70 ° C.
  • a multilayer structure is then obtained consisting of the plastic film in PET, a non-stick layer of stearo chromium chloride and the printable layer A.
  • the free face of layer A is glued with a Super-Lok® 364 adhesive from the company National Starch.
  • the glue is deposited at a rate of 3 g / m 2 on layer A.
  • the glued side of layer A is applied against a substrate formed by a Bristol® 335 g / m 2 paper manufactured by the company Arjowiggins, then the whole is dried. in an oven at 70 ° C. Step b / of the process is then completed.
  • the plastic film and the release layer are then removed (during step c /) to leave only the printable layer A and the glue on the paper substrate.
  • Example 2 Preparation of a smooth or ultra smooth sheet printable by offset, from a bulky paper or having a relatively large hand
  • Example 2 Printable layer A of Example 2 is prepared and applied in the same manner and under the same conditions as those discussed in Example 1, on Elementa® bulk paper from the company Arjowiggins. This paper has an initial hand of 1.4cm 3 / g.
  • Example 3 Preparation of a smooth or ultra smooth sheet printable by offset, from a precoated support paper
  • Example 3 Printable layer A of Example 3 is prepared and applied in the same manner and under the same conditions as those discussed in Example 1, on a precoated Maine Gloss® paper from the company Arjowiggins. This paper has an initial Bekk smoothness of 400s.
  • Example 4 Preparation of a smooth or ultra smooth colored sheet printable by offset
  • a smooth or ultra-smooth colored sheet was prepared according to the invention for offset printing, from a printable layer B having the following composition: Composition of printable layer B Pigments Calcium carbonate 1248g Hydrocarb ® 60 OG (Omya) Binder Aqueous dispersion of n-butyl acrylate-acrylonitrile-styrene copolymer 300g Acronal ® S504 (BASF) Dispersing Sulfoccinic acid - isooctyl ester, sodium salt 3g Agnique ® EHS 75E (Cognis) Rheological modifier Aqueous dispersion of acrylic copolymer 0.6g Slerocol ® FD (BASF) Spreading agent Non-ionic surfactant 0.2g Surfynol ® 420 (Safic-Alcan) Dye Blue Levacell ® B liq (Bayer) 0.1g
  • Printable layer B has a final concentration by weight of 50% and a viscosity of 100cps, measured using a Brookfield® viscometer.
  • Layer B is applied to one side of a PET plastic film which is previously covered with a non-stick layer based on stearo chromium chloride.
  • the deposit of layer B on the film is approximately 10 g / m 2 .
  • Layer B is then dried in an oven at 70 ° C.
  • a multilayer structure is then obtained consisting of the plastic film in PET, a non-stick layer of stearo chromium chloride and the printable layer B.
  • the free face of layer B is glued with a Super-Lok® 364 adhesive from the company National Starch.
  • the glue is deposited at a rate of 3 g / m 2 on layer B.
  • the glued side of layer B is applied against a substrate formed by a Bristol® 335 g / m 2 paper manufactured by the company Arjowiggins, then the whole is dried. in an oven at 70 ° C.
  • the plastic film and the release layer are then removed to leave only the printable layer B and the glue on the paper substrate.
  • the paper obtained has a very homogeneous coloring.
  • Example 5 Preparation of a smooth or ultra smooth sheet printable by offset and with low surface resistivity
  • a smooth or ultra-smooth sheet according to the invention with low surface resistivity and for offset printing was prepared, from a printable layer C having the following composition: Composition of printable layer C Pigments Calcium carbonate 1248g Hydrocarb ® 60 OG (Omya) Binder Aqueous dispersion of n-butyl acrylate-acrylonitrile-styrene copolymer 300g Acronal ® S504 (BASF) Dispersing Sulfoccinic acid - isooctyl ester, sodium salt 3g Agnique ® EHS 75E (Cognis) Conductive additive Aqueous dispersion of a conductive polymer 3g Clevios ® P (HC Starck) Rheological modifier Aqueous dispersion of acrylic copolymer 0.6g Sterocoll ® FD (BASF) Spreading agent Non-ionic surfactant 0.2g Surfynol ® 420 (Safic-Alcan)
  • Printable layer C has a final concentration by weight of 50% and a viscosity of 100cps, measured using a Brookfield® viscometer.
  • Layer C is applied to one side of a PET plastic film which is previously covered with a non-stick layer based on stearo chromium chloride
  • the deposit of layer C on the film is approximately 10 g / m2.
  • Layer C is then dried in an oven at 70 ° C.
  • a multilayer structure is then obtained consisting of the plastic film in PET, a non-stick layer of stearo chromium chloride and the printable layer C.
  • the free face of layer C is glued with a Super-Lok® 364 glue from the company National Starch.
  • the glue is deposited at a rate of 3 g / m 2 on layer C.
  • the glued side of layer C is applied against a substrate formed by a Bristol® 335 g / m 2 paper manufactured by the company Arjowiggins, then the whole is dried. in an oven at 70 ° C.
  • the plastic film and the release layer are then removed to leave only the printable layer C and the glue on the paper substrate.
  • the resistivity of the paper thus obtained is relatively low, and is of the order of 3.10 7 . This resistivity is lower than that of the paper of Example A, which is of the order of approximately 1.10 10.
  • Example 6 Preparation of a smooth or ultra smooth inkjet printable sheet
  • a smooth or ultra-smooth sheet according to the invention for inkjet printing was prepared, from a printable layer D having the following composition: Compounds Pigments Alumina 1000g Disperal HP14-2 (Sasol) Binder Polyvinyl Alcohol 100g Mowiol 47-88 (Seppic) Spreading agent Non-ionic surfactant 1g Surfynol ® CT211 (Safic-Alcan)
  • Printable layer D has a final concentration by weight of 14% and a viscosity of 50cps, measured using a Brookfield® viscometer.
  • Layer D is applied to one side of a PET plastic film which is previously covered with a non-stick layer based on stearo chromium chloride.
  • the deposit of layer D on the film is approximately 15 g / m 2 .
  • Layer D is then dried in an oven at 70 ° C.
  • a multilayer structure is then obtained consisting of the plastic film in PET, a non-stick layer of stearo chromium chloride and the printable layer D.
  • the free face of layer D is glued with Super-Lok® 364 glue from the company National Starch.
  • the glue is deposited at a rate of 3 g / m 2 on layer D.
  • the glued face of layer D is applied against a substrate formed by a Bristol paper 335 g / m 2 manufactured by the company Arjowiggins, then the whole is dried in an oven at 70 ° C.
  • the plastic film and the release layer are then removed to leave only the printable layer D and the glue on the paper substrate.
  • the transfer of a printable layer (A to D) on a support causes an increase in the basis weight and thickness of this support.
  • the increase in basis weight is of the order of 30 to 40 g / m 2 in the case of layer A, of 126 g / m 2 in the case of layer B, of 41 g / m 2 in the case of layer C , and 24g / m 2 in the case of layer D.
  • the increase in thickness is of the order of 20 to 33 ⁇ m in the case of layer A, 60 ⁇ m in the case of layer B, 64 ⁇ m in the case of layer C, and 84 ⁇ m in the case of layer D.
  • the increase in the basis weight and thickness of the support is essentially due to the addition of glue and the transfer of the printable layer to this support .
  • a paper has a relatively large hand when it has a value greater than or equal to 1.10 cm 3 / g. In the aforementioned examples, only Elementa® bulk paper has a large hand (1.4cm 3 / g).
  • the deposition of the printable layer A on a support causes a decrease in its hand.
  • the support initially has a large hand, as is the case with Elementa® bulk in example 2, the transfer of layer A onto this support results in a slight decrease in its hand (of the order of 5%) .
  • the strength of the Etementa® butk support comprising layer A remains very high (1.33cm 3 / g, that is to say greater than 1.10cm 3 / g).
  • the deposition of the printable layer B on a support causes a decrease in his hand, while the deposition of the printable layer C on a support has little influence on his hand.
  • the deposition of the printable layer D on a support results in an increase in its hand since the printable layer is here an inkjet layer which is very porous and therefore has a low density.
  • the transfer of the layer D on a Bristol® support makes it possible to increase its smoothness to approximately 1000s.
  • the sheets prepared in Examples 1 to 6 all have a high gloss, greater than 80%. The process therefore makes it possible to produce sheets having both high smoothness and gloss.
  • the presence of a conductive additive in the layer C makes it possible to significantly reduce the surface resistivity of the sheet.
  • the sheet of Example 5 has a lower surface resistivity by a factor of about 1000 than that of the sheets of Examples 1 and 4. This additive makes it possible to increase the electrical conductivity of the sheets and therefore to consider the production of electro-sheets. conductors.
  • the test with porometric inks shows that the papers have relatively correct optical density values after inking, even if these do not increase over time. , thus showing limited absorption.
  • Example 6 As regards the inkjet printable paper, prepared in Example 6, tests on an Epson and Canon inkjet printer show correct results despite a low deposit.
  • Example 7 Preparation of a smooth or ultra-smooth printable sheet comprising a varnish or a printable resin
  • a smooth or ultra-smooth sheet was prepared according to the invention, from a printable layer formed by a varnish or an acrylic printable resin E having the following composition.
  • This sheet is printable by Offset.
  • Composition of printable varnish E Binder Aqueous dispersion of n-butyl acrylate-acrylonitrile-styrene copolymer 300g Acronal ® S305D (BASF) Dispersing Sulfoccinic acid - isooctyl ester, sodium salt 3g Agnique ® EHS 75E (Cognis) Rheological modifier Aqueous dispersion of acrylic copolymer 0.6g Sterocoll ® FD (BASF) Spreading agent Non-ionic surfactant 0.2g Surfynol ® 420 (Safic-Alcan)
  • the printable varnish E has a final concentration by weight of 50% and a viscosity of 50cps, measured using a Brookfield® viscometer.
  • the varnish E is applied to one side of a plastic film in PET, which is previously covered with a non-stick layer based on stearo chromium chloride.
  • the deposit of the varnish on the film is approximately 5 g / m 2 .
  • the varnish is then dried in an oven at 70 ° C.
  • a multilayer structure is then obtained consisting of the plastic film in PET, a non-stick layer of stearo chromium chloride and the acrylic varnish.
  • the free side of the varnish is glued with Super-Lok® 364 glue from National Starch.
  • the glue is deposited at a rate of 3 g / m 2 on the varnish.
  • the glued side of the varnish is applied against a substrate formed by a Bristol® 335 g / m 2 paper manufactured by the company Arjowiggins, then the whole is dried in an oven at 70 ° C.
  • the plastic film and the non-stick layer are then removed (during step c /) to leave only the printable varnish and the glue on the paper substrate.
  • the transfer of the printable varnish E on the support modifies the grammage, the thickness and the handling of this support little. This transfer makes it possible to produce a sheet with very high smoothness (> 10,000s) and gloss (99%). The printability of this sheet is however lower than those prepared in Examples 1 to 6 due to the absence of pigments in the printable layer.
  • Example 8 Preparation of smooth or ultra-smooth printable sheets printable by Offset, Indigo, or by electrically conductive inks
  • Each sheet prepared here comprises two printable layers AA, AB or AC, a first layer (A, B or C) deposited (by kiss coating) on the non-stick layer of the multilayer structure and a second layer (A) deposited (by kiss coating) ) on the first layer.
  • the first layer that is to say the layer closest to the plastic film in the multilayer structure, is the layer intended to directly receive the inks during printing. It is this which defines the printability according to the printing process.
  • the second layer is a precoat allowing good adhesion of the first layer to the support and forming a barrier to the adhesive (to prevent the latter from penetrating into the first printable layer).
  • the plastic film used is a 12 ⁇ m thick PET film.
  • the printable layers for the preparation of an offset printable sheet are a first layer B, and a second layer A.
  • the printable layers for the preparation of an HP Indigo printable sheet are a first layer C, and a second layer A.
  • the printable layers for the preparation of a sheet printable by electrically conductive inks (Printed Electronics) are a first layer A, and a second layer A.
  • the multilayer structures prepared are of the PET type / release layer / A&A or C&A layers or B&A.
  • the layers A, B and C are deposited at a rate of 6 g / m 2 .
  • compositions of these layers are detailed in the following tables.
  • Composition of printable layer A Pigments Calcium carbonate 475ml Carbital ® 95 (Imerys)
  • Binder 1 Aqueous dispersion of styrene-butadiene copolymer 190ml Styronal® D517 (BASF)
  • Binder 2 Aqueous dispersion of n-butyl acrylate-acrylonitrile-styrene copolymer 94ml Acrona ® S 05 (BASF) Dispersing Sulfoccinic acid - isooctyl ester, sodium salt 3g Agnique ® EHS 75E (Cognis) Rheological modifier Aqueous dispersion of acrylic copolymer 0.6g Sterocoll ® FD (BASF) Spreading agent Non-ionic surfactant 0.2g Surfynol ® 420 (Safic-Alcan)
  • Composition of printable layer B Pigments Calcium carbonate 475ml
  • Each of the three multilayer structures and a 200 g / m 2 Opale® paper from Arjowiggins were laminated with a two-component polyurethane adhesive, deposited at a rate of 10 g / m 2 .
  • the sheets obtained exhibit good printability depending on their applications, that is to say for offset, for digital HP Indigo and for conductive inks (printed electronics).

Landscapes

  • Laminated Bodies (AREA)
  • Ink Jet (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Paper (AREA)
EP10809308.9A 2009-12-23 2010-12-22 Feuille imprimable ultra lisse et recyclable et son procédé de fabrication Active EP2516741B2 (fr)

Applications Claiming Priority (2)

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FR0906325A FR2954361B1 (fr) 2009-12-23 2009-12-23 Feuille imprimable ultra lisse et recyclable et son procede de fabrication
PCT/FR2010/052879 WO2011077048A1 (fr) 2009-12-23 2010-12-22 Feuille imprimable ultra lisse et recyclable et son procédé de fabrication

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EP (1) EP2516741B2 (ru)
JP (2) JP5890317B2 (ru)
KR (1) KR101970770B1 (ru)
CN (1) CN102666989B (ru)
BR (1) BR112012015134A2 (ru)
CA (1) CA2785183C (ru)
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FR (1) FR2954361B1 (ru)
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FR2954361B1 (fr) 2012-06-15
EP2516741A1 (fr) 2012-10-31
ES2517365T3 (es) 2014-11-03
RU2012122864A (ru) 2014-01-27
US20120308744A1 (en) 2012-12-06
US9416495B2 (en) 2016-08-16
BR112012015134A2 (pt) 2016-06-21
ES2517365T5 (es) 2021-12-14
CN102666989B (zh) 2015-11-25
HK1173478A1 (en) 2013-05-16
JP2016106183A (ja) 2016-06-16
EP2516741B1 (fr) 2014-08-06
JP2013515628A (ja) 2013-05-09
WO2011077048A1 (fr) 2011-06-30
RU2538581C2 (ru) 2015-01-10
CN102666989A (zh) 2012-09-12
FR2954361A1 (fr) 2011-06-24
KR20120125406A (ko) 2012-11-14
KR101970770B1 (ko) 2019-08-27
CA2785183C (fr) 2017-08-01
ZA201203884B (en) 2013-01-31
IN2012DN05032A (ru) 2015-10-02
CA2785183A1 (fr) 2011-06-30
JP6218795B2 (ja) 2017-10-25
JP5890317B2 (ja) 2016-03-22

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