EP2251483A1 - High-printability coated paper and method for its production - Google Patents

High-printability coated paper and method for its production

Info

Publication number
EP2251483A1
EP2251483A1 EP20100160132 EP10160132A EP2251483A1 EP 2251483 A1 EP2251483 A1 EP 2251483A1 EP 20100160132 EP20100160132 EP 20100160132 EP 10160132 A EP10160132 A EP 10160132A EP 2251483 A1 EP2251483 A1 EP 2251483A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
paper
weight
coated
comprises
comprised
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.)
Granted
Application number
EP20100160132
Other languages
German (de)
French (fr)
Other versions
EP2251483B1 (en )
Inventor
Pierino Piano
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.)
Fedrigoni SpA
Original Assignee
Cartiere Fedrigoni E C SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/10Coatings without pigments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52Macromolecular coatings
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/10Coatings without pigments
    • D21H19/14Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/36Coatings with pigments
    • D21H19/44Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/46Non-macromolecular organic compounds
    • D21H19/48Diolefins, e.g. butadiene; Aromatic vinyl monomers, e.g. styrene; Polymerisable unsaturated acids or derivatives thereof, e.g. acrylic acid
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/36Coatings with pigments
    • D21H19/44Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/62Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22Addition to the formed paper
    • D21H23/32Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34Knife or blade type coaters
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/16Rearranging applied substances, e.g. metering, smoothing; Removing excess material with a blast of vapour or gas, e.g. air knife
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52Macromolecular coatings
    • B41M5/5218Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52Macromolecular coatings
    • B41M5/5254Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52Macromolecular coatings
    • B41M5/5263Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B41M5/5281Polyurethanes or polyureas

Abstract

High-printability coated paper, comprising a paper substrate that has at least one coated face that comprises a layer of substantially uniform thickness of a composition comprising a polyurethane-based polymeric material in a percentage comprised between 65% and 90% by weight of the total weight and latex in a percentage comprised between 5% and 20% by weight of the total weight.

Description

  • [0001]
    The present invention refers to a high-printability coated paper and to a method for its production.
  • [0002]
    Nowadays papers are known and widespread upon which special surface treatments are carried out, for example coatings that can confer special effects both in aesthetic and tactile terms.
  • [0003]
    Indeed, in the paper sector, new ideas and technical solutions are continually being sought that make it possible to obtain paper products that are innovative and special, and capable of attracting, intriguing and astonishing end users. As indicated above, one of the paths taken by paper makers is to develop new types of paper that have tactile properties which are different from the usual ones, while at the same time maintaining the normal characteristics of the paper substrate.
  • [0004]
    In particular it has been found that almost all paper products provided with surface finishings that provide the specific tactile sensations of "plastic effect" or "silk/leather effect" present substantially two types of drawback.
  • [0005]
    A first drawback is constituted by the extreme sensitivity of the coating layer to pressure, a phenomenon that leads to adhesiveness between successive coils of coated paper when it is spooled onto a roll or between successive sheets once the paper has been cut and stacked (in the jargon, this phenomenon is known as "blocking").
  • [0006]
    A second drawback is related to lower print quality on the above mentioned paper products compared to what can be obtained on traditional papers for graphic uses. Specifically, it has been found that there are difficulties in anchoring the ink, a lack of sharpness of the print typeset, and what is known as "setoff" owing to the ink slow drying speed.
  • [0007]
    The aim of the present invention is to obtain a paper, and specifically a high-printability coated paper, that has a tactile sensation which is special and unique, different from other products present on the market.
  • [0008]
    Within this aim, an object of the present invention is to make available a high-printability coated paper that can be used for packaging and for printing using the methods normally used for natural or traditional coated papers, including for example offset, embossing, hot stamping, thermal imaging and silk-screen for printing, and cutting, punching, creasing, folding and gluing for packaging operations.
  • [0009]
    Another object of the invention is to provide a high-printability coated paper that, specifically, has a surface that is soft and smooth to the touch and which at the same time has an opacity such as to bring to mind the concept of softness, also in visual terms.
  • [0010]
    A further object of the invention is to make available a method for producing a new type of high-printability coated paper which is extremely reliable and efficacious.
  • [0011]
    A further object of the invention is to develop a high-printability coated paper that allows effective anchoring of the ink during printing and which, at the same time, is less subject to the phenomenon of blocking.
  • [0012]
    This aim, as well as these and other objects which will become better apparent hereinafter, are achieved by a high-printability coated paper, comprising a paper substrate that has at least one coated face, characterized in that said coating comprises a layer of substantially uniform thickness of a composition that comprises a polyurethane-based polymeric material in a percentage comprised between 65% and 90% by weight of the total weight and latex in a percentage comprised between 5% and 20% by weight of the total weight.
  • [0013]
    The invention also provides a method for producing coated paper, characterized in that the method comprises the step of depositing, by coating, on at least one face of a paper substrate, a composition comprising a polyurethane-based polymeric material in a percentage comprised between 65% and 90% by weight of the total weight and latex in a percentage comprised between 5% and 20% by weight of the total weight.
  • [0014]
    Further characteristics and advantages of the invention will become better apparent from the following detailed description of some preferred, but not exclusive, embodiments of a high-printability coated paper, and of its production method, according to the invention.
  • [0015]
    In the embodiments that follow, individual characteristics shown in relation to specific examples may in reality be interchanged with other, different characteristics, existing in other embodiments.
  • [0016]
    The present invention refers to a coated paper, particularly adapted to printing and packaging, which comprises a paper substrate that has at least one coated face.
  • [0017]
    According to the present invention, the coating comprises a layer, of substantially uniform thickness, of a composition that comprises a polyurethane-based polymeric material in a percentage comprised between 65% and 90% by weight of the total weight and latex in a percentage comprised between 5% and 20% by weight of the total weight.
  • [0018]
    In particular, such composition is constituted by an aqueous dispersion of polyurethane-based polymeric material and latex.
  • [0019]
    Advantageously, the composition also comprises talc in a percentage of less than 20% by weight of the total weight.
  • [0020]
    Advisably, the paper substrate has a grammage that is comprised between 85g/m2 and 400 g/m2, a Bendtsen roughness degree that is comprised between 50 ml/min and 200 ml/min and a water absorption index (Cobb index) that is comprised between 20 g/m2 and 25 g/m2.
  • [0021]
    Obviously, the paper substrates used can be white or mass-coloured.
  • [0022]
    More precisely, the polyurethane-based polymeric material comprises a film-forming bonding agent, which comprises dispersions of anionic urethane polymers having aliphatic rigid segments and flexible polyether and polyester segments.
  • [0023]
    In this regard, the use of the formula commercially known as "Rolflex 2090", which is made by Lamberti S.p.A. in Gallarate (Varese, Italy) and which comprises, as well as the abovementioned components, silica, formulation auxiliaries and functional additives, has been found to be particularly suitable.
  • [0024]
    Advantageously, the composition is applied to such at least one face of the paper substrate in a quantity comprised between 3 g/m2 and 15 g/m2, preferably between 5 g/m2 and 10 g/m2.
  • [0025]
    It has also been found to be particularly useful to ensure that the talc added to the composition has an average diameter of 2.0 microns and a granulometric distribution such that at least 45%, preferably at least 48%, of the particles have a diameter of less than 2 microns.
  • [0026]
    Advisably, the latex used is of the SBR (Styrene-Butadiene-Rubber) type, but obviously there is no reason why other types of latex such as, for example, acrylic-based latexes should not be used, even though experimental results for such latexes have not been shown to be as satisfactory.
  • [0027]
    Obviously it is possible to add coloured pigments to the composition, if desired, to give more intense colourings to the coated surface.
  • [0028]
    According to another aspect, the present invention provides a method for producing coated paper which provides for the deposition, by coating, on at least one face of a paper substrate, of a composition comprising a polyurethane-based polymeric material in a percentage comprised between 65% and 90% by weight of the total weight and latex in a percentage comprised between 5% and 20% by weight of the total weight.
  • [0029]
    Advisably, the composition comprises talc in a percentage of less than 20% by weight of the total weight.
  • [0030]
    By way of example, the coating comprises an air knife coating.
  • [0031]
    According to a particularly important aspect, the temperature of the ribbon of coated paper should be kept at a temperature lower than 30°C.
  • [0032]
    Specifically, the production method makes use of one or more spreading rollers to take the coating that has a composition comprising polyurethane-based polymeric material, latex and possibly talc, in the percentages indicated above from a containment receptacle and to transfer it onto a ribbon of paper substrate upon which the coating is to be executed.
  • [0033]
    The quantity of coating applied exceeds the desired end result and the operation to remove the excess quantity is carried out by means of a "calibrated air blast" or air knife located immediately downstream of the applicator rollers.
  • [0034]
    Subsequently there is a drying phase which takes place by means of various different technologies such as, for example, radiation drying using infrared rays, convection drying using hot-air hoods, or conduction drying using steam-heated cylinders.
  • [0035]
    This phase can be followed by an identical sequence of operations if it is desired to apply a coating to the other side of the paper substrate as well.
  • [0036]
    Lastly, any accessory operations (for example cooling, coating, smoothing) can be performed before spooling the paper in rolls.
  • [0037]
    It has been found by experimental analysis of the coated paper according to the invention that the tactile effect obtained is, in effect, extremely unusual and original and able to convey the concept of "softness", also in visual terms.
  • [0038]
    From tests carried out, it has also been verified that the "blocking" phenomenon is greatly reduced by the combined action of the latex. The optional addition of talc has also produced a degree of printability that is substantially similar to that of papers for graphic uses.
  • [0039]
    In addition, all the details can be replaced by other technically equivalent elements.
  • [0040]
    The disclosures in Italian Patent Application No. VR2009A000054 from which this application claims priority are incorporated herein by reference.
  • [0041]
    Where the technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims (11)

  1. A high-printability coated paper, comprising a paper substrate that has at least one coated face, characterized in that said coating comprises a layer of substantially uniform thickness of a composition comprising a polyurethane-based polymeric material in a percentage comprised between 65% and 90% by weight of the total weight and latex in a percentage comprised between 5% and 20% by weight of the total weight.
  2. The high-printability coated paper according to claim 1, characterized in that said composition comprises talc in a percentage below 20% by weight of the total weight.
  3. The high-printability coated paper according to claim 1, characterized in that said polyurethane-based polymeric material comprises a film-forming bonding agent, which comprises dispersions of anionic urethane polymers having aliphatic rigid segments and flexible polyether and polyester segments.
  4. The high-printability coated paper according to one or more of the preceding claims, characterized in that said composition is applied on said at least one face in a quantity comprised between 3 g/m2 and 15 g/m2, preferably between 5 g/m2 and 10 g/m2.
  5. The high-printability coated paper according to one or more of the preceding claims, characterized in that said paper substrate has a grammage comprised between 85 g/m2 and 400 g/m2.
  6. The high-printability coated paper according to one or more of claims 2 to 5, characterized in that said talc has an average diameter of 2.0 microns and a particle size distribution such that at least 45% of the particles have a diameter of less than 2 microns.
  7. The high-printability coated paper according to one or more of the preceding claims, characterized in that said latex is of the SBR (Styrene-Butadiene-Rubber) type.
  8. A method for producing high-printability coated paper, characterized in that it comprises the step of depositing, by coating, on at least one face of a paper substrate, a composition comprising a polyurethane-based polymeric material in a percentage comprised between 65% and 90% by weight of the total weight and latex in a percentage comprised between 5% and 20% by weight of the total weight.
  9. The method according to claim 8, characterized in that said composition comprises talc in a percentage of less than 20% by weight of the total weight.
  10. The method according to one or more of claims 8 and 9, characterized in that said coating comprises an air knife coating.
  11. The method according to one or more of claims 8 and 9, characterized in that the temperature of the ribbon of coated paper is kept below 30°C.
EP20100160132 2009-04-20 2010-04-16 High-printability coated paper and method for its production Active EP2251483B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ITVR20090054 2009-04-20

Publications (2)

Publication Number Publication Date
EP2251483A1 true true EP2251483A1 (en) 2010-11-17
EP2251483B1 EP2251483B1 (en) 2012-10-31

Family

ID=40935508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100160132 Active EP2251483B1 (en) 2009-04-20 2010-04-16 High-printability coated paper and method for its production

Country Status (3)

Country Link
EP (1) EP2251483B1 (en)
DK (1) DK2251483T3 (en)
ES (1) ES2394043T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103114497A (en) * 2012-12-27 2013-05-22 天津海华科技发展有限公司 Reel China paper for replication of artwork and producing process thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281267A (en) * 1961-11-13 1966-10-25 Lowe Paper Co High gloss coated paper
US4155892A (en) * 1975-10-03 1979-05-22 Rohm And Haas Company Polyurethane thickeners for aqueous compositions
US4507426A (en) * 1983-01-03 1985-03-26 The Dow Chemical Company Synergistic mixture of polyurethane and emulsion polymers useful as thickeners for aqueous systems
EP0461768A1 (en) * 1990-06-14 1991-12-18 Anglo-American Clays Corporation Defined and delaminated kaolin product
US5478388A (en) * 1993-05-04 1995-12-26 Ecc International Limited Pigment for a coating composition for printing paper
EP0773263A2 (en) * 1995-11-07 1997-05-14 Rheox International, Inc. A super dispersable thickening composition for aqueous systems and a method of thickening said aqueous systems
US20070240619A1 (en) * 2004-05-12 2007-10-18 Alpha Calcit Fullstoff Gesellschaft Mbh Surface-Modified Inorganic Fillers and Pigments

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281267A (en) * 1961-11-13 1966-10-25 Lowe Paper Co High gloss coated paper
US4155892A (en) * 1975-10-03 1979-05-22 Rohm And Haas Company Polyurethane thickeners for aqueous compositions
US4507426A (en) * 1983-01-03 1985-03-26 The Dow Chemical Company Synergistic mixture of polyurethane and emulsion polymers useful as thickeners for aqueous systems
EP0461768A1 (en) * 1990-06-14 1991-12-18 Anglo-American Clays Corporation Defined and delaminated kaolin product
US5478388A (en) * 1993-05-04 1995-12-26 Ecc International Limited Pigment for a coating composition for printing paper
EP0773263A2 (en) * 1995-11-07 1997-05-14 Rheox International, Inc. A super dispersable thickening composition for aqueous systems and a method of thickening said aqueous systems
US20070240619A1 (en) * 2004-05-12 2007-10-18 Alpha Calcit Fullstoff Gesellschaft Mbh Surface-Modified Inorganic Fillers and Pigments

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103114497A (en) * 2012-12-27 2013-05-22 天津海华科技发展有限公司 Reel China paper for replication of artwork and producing process thereof

Also Published As

Publication number Publication date Type
ES2394043T3 (en) 2013-01-16 grant
EP2251483B1 (en) 2012-10-31 grant
DK2251483T3 (en) 2013-02-11 grant

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