EP2520709B1 - Sand-effect paper material and corresponding manufacturing method - Google Patents

Sand-effect paper material and corresponding manufacturing method Download PDF

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Publication number
EP2520709B1
EP2520709B1 EP12167036.8A EP12167036A EP2520709B1 EP 2520709 B1 EP2520709 B1 EP 2520709B1 EP 12167036 A EP12167036 A EP 12167036A EP 2520709 B1 EP2520709 B1 EP 2520709B1
Authority
EP
European Patent Office
Prior art keywords
paper material
pigments
substrate
coating
kaolins
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.)
Active
Application number
EP12167036.8A
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German (de)
French (fr)
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EP2520709A1 (en
Inventor
Luca Monacelli
Ferruccio Gilberti
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.)
Gruppo Cordenons SpA
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Gruppo Cordenons SpA
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • 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
    • 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

Definitions

  • the present invention relates to a sand-rough-effect paper material (paper/cardboard) and to the corresponding manufacturing method. More precisely, the paper material of the invention, thanks to an appropriately devised pulp and to a specific surface treatment, loses the typical feel of paper materials and is characterized by a feel similar to that of sand.
  • US 5334286 A and WO 00/22231 A1 disclose a tissue-type paper material, not suitable for printing with high quality.
  • An aim of the present invention is to provide a paper material that presents a feel different from that of traditional paper materials and at the same time enables a high printing quality.
  • the present invention hence regards a paper material and the corresponding manufacturing method as defined in the annexed Claims 1 and 7, respectively.
  • the invention hence provides a sand-effect paper material (paper/cardboard), which, thanks to an appropriately devised pulp and to a specific surface treatment, loses the typical feel of paper materials and is characterized by a feel similar to that of sand, having a rough surface finish typical of a surface covered with fine sand.
  • the paper material of the invention moreover ensures a high printing quality and enables particular graphic effects to be achieved, which are difficult to obtain with traditional coated papers.
  • the paper material of the invention comprises a substrate that is formed by a mixture of cellulose fibres and contains at least one polymeric substance, capable of bestowing (dry and wet) strength on the mixture of fibres, and an inorganic filler, capable of bestowing on the material good characteristics of machinability.
  • the substrate has at least one surface (face) treated with at least one surface adhesive and a glossy coating having particular components so that the paper material, owing to the combined effect of the composition of the substrate and of the surface treatment, presents a feel similar to that of sand.
  • both of the faces of the substrate can be treated in the same way.
  • the polymeric substance included in the substrate comprises one or more colophony-based and/or alkyl-ketene-dimer-based and/or acetyl-succinic-acid-based and/or epichlorohydrin-based resins, and/or modified starches
  • the inorganic filler is a mineral filler comprising one or more substances selected in the group consisting of carbonates, kaolins, talc, and mixtures thereof.
  • the surface adhesive is, for example, an adhesive with a base of starch and/or polyvinyl alcohol and/or acrylic, polyurethane and/or styrene-butadiene polymers.
  • the paper material of the invention is provided with a glossy coating, applied on the treated surface (clearly, the paper material can have both of the surfaces treated and provided with a glossy coating).
  • the glossy coating is formed by one or more binding polymers (for example, polyurethane-based and/or silicone-based polymers, and/or acrylic polymers, styrene-butadiene polymers, polyvinyl-acetate polymers, polyvinylalcohol polymers, and the like) and/or waxes, mixed with pigments, for example, pigments with a lamellar or flat structure, such as, for example, precipitated calcium carbonate (PCC), kaolins for coating, calcined and/or lamellar kaolins, in combination with pigments with a base of calcium silicates having different grain sizes and degree of whiteness higher than 85 (according to the DIN 5033 standard).
  • binding polymers for example, polyurethane-based and/or silicone-based polymers, and/or acrylic polymers, styrene-butadiene polymers, polyvinyl-acetate polymers, polyvinylalcohol polymers, and the like
  • waxes mixed with pigments
  • These calcium-silicate-based pigments preferably having particles of variable grain size and a particular degree of whiteness are especially important for achieving the desired effect.
  • the pigments comprise wallastonite (calcium silicate of formula CaSiO 3 ).
  • the amount of polymer per face is preferably comprised between 5% and 100% with respect to the pigments; the substance of the paper material is comprised between 90 g/m 2 and 350 g/m 2 ; the amount of glossy coating spread on each face is comprised between 5 g/m 2 and 20 g/m 2 .
  • the glossy coating may be coloured and/or spread on a coloured substrate; preferably, colours in paste form and organic or inorganic pigments are used.
  • the substrate is provided with techniques of formation of paper that are substantially known, for example, on a paper machine.
  • an aqueous pulp constituted by cellulose fibres, said pulp containing the polymeric substance (colophony-based and/or alkyl-ketene-dimer-based and/or acetyl-succinic-acid-based and/or epichlorohydrin-based resins, and/or modified starches) and the inorganic filler (carbonates, kaolins, talc, etc.).
  • polymeric substance colophony-based and/or alkyl-ketene-dimer-based and/or acetyl-succinic-acid-based and/or epichlorohydrin-based resins, and/or modified starches
  • the inorganic filler carbonates, kaolins, talc, etc.
  • aqueous solution of surface adhesive for example, made up of an aqueous solution of starch (10 wt%), and/or acrylic adhesive (5 wt%), or adhesives similar to the ones described previously (adhesives with a base of polyvinyl alcohol and/or of acrylic, polyurethane and/or styrene-butadiene polymers).
  • the treatment with the surface adhesive has also the purpose of bestowing on the paper material a correct penetration of water, indispensable for the subsequent coating step.
  • the method then comprises, after the surface treatment with adhesive, a step of smoothing of the substrate, where the substrate is smoothed up to Bendsten ISO 2494 roughness values of less than 50 ml/min and preferably of less than 30 ml/min, and indicatively 20 ml/min.
  • application of the glossy coating is performed by spreading carried out with an air-blade or smoothing-blade coating machine, and is followed by a step of drying of the coating, conducted in an infrared oven and/or hot-air oven at a temperature of between 100°C and 180°C and with an oven time of between 0.5 and 4 minutes.
  • the method comprises a step of mechanical treatment of the surface provided with the coating, in particular a smoothing step and/or an embossing step.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)

Description

    "SAND-EFFECT PAPER MATERIAL AND CORRESPONDING MANUFACTURING METHOD"
  • The present invention relates to a sand-rough-effect paper material (paper/cardboard) and to the corresponding manufacturing method. More precisely, the paper material of the invention, thanks to an appropriately devised pulp and to a specific surface treatment, loses the typical feel of paper materials and is characterized by a feel similar to that of sand.
  • US 5334286 A and WO 00/22231 A1 disclose a tissue-type paper material, not suitable for printing with high quality.
  • In the paper-making sector there is a constant search for new types of papers having particular appearances and/or finishes, above all designed for wrapping, packaging, production of illustrative material, quality printing, etc.
  • Not infrequently, however, these particular effects are achieved at the expense of other characteristics of the paper, for example, printability.
  • An aim of the present invention is to provide a paper material that presents a feel different from that of traditional paper materials and at the same time enables a high printing quality.
  • The present invention hence regards a paper material and the corresponding manufacturing method as defined in the annexed Claims 1 and 7, respectively.
  • Preferred embodiments of the paper material and of the corresponding manufacturing method are defined in the dependent Claims.
  • The invention hence provides a sand-effect paper material (paper/cardboard), which, thanks to an appropriately devised pulp and to a specific surface treatment, loses the typical feel of paper materials and is characterized by a feel similar to that of sand, having a rough surface finish typical of a surface covered with fine sand.
  • The paper material of the invention moreover ensures a high printing quality and enables particular graphic effects to be achieved, which are difficult to obtain with traditional coated papers.
  • In detail, the paper material of the invention comprises a substrate that is formed by a mixture of cellulose fibres and contains at least one polymeric substance, capable of bestowing (dry and wet) strength on the mixture of fibres, and an inorganic filler, capable of bestowing on the material good characteristics of machinability.
  • The substrate has at least one surface (face) treated with at least one surface adhesive and a glossy coating having particular components so that the paper material, owing to the combined effect of the composition of the substrate and of the surface treatment, presents a feel similar to that of sand. Clearly, both of the faces of the substrate can be treated in the same way.
  • Preferably, the polymeric substance included in the substrate comprises one or more colophony-based and/or alkyl-ketene-dimer-based and/or acetyl-succinic-acid-based and/or epichlorohydrin-based resins, and/or modified starches, and the inorganic filler is a mineral filler comprising one or more substances selected in the group consisting of carbonates, kaolins, talc, and mixtures thereof.
  • The surface adhesive is, for example, an adhesive with a base of starch and/or polyvinyl alcohol and/or acrylic, polyurethane and/or styrene-butadiene polymers. Moreover, the paper material of the invention is provided with a glossy coating, applied on the treated surface (clearly, the paper material can have both of the surfaces treated and provided with a glossy coating).
  • In particular, the glossy coating is formed by one or more binding polymers (for example, polyurethane-based and/or silicone-based polymers, and/or acrylic polymers, styrene-butadiene polymers, polyvinyl-acetate polymers, polyvinylalcohol polymers, and the like) and/or waxes, mixed with pigments, for example, pigments with a lamellar or flat structure, such as, for example, precipitated calcium carbonate (PCC), kaolins for coating, calcined and/or lamellar kaolins, in combination with pigments with a base of calcium silicates having different grain sizes and degree of whiteness higher than 85 (according to the DIN 5033 standard).
  • These calcium-silicate-based pigments, preferably having particles of variable grain size and a particular degree of whiteness are especially important for achieving the desired effect.
  • In particular, the pigments comprise wallastonite (calcium silicate of formula CaSiO3).
  • The amount of polymer per face is preferably comprised between 5% and 100% with respect to the pigments; the substance of the paper material is comprised between 90 g/m2 and 350 g/m2; the amount of glossy coating spread on each face is comprised between 5 g/m2 and 20 g/m2.
  • The glossy coating may be coloured and/or spread on a coloured substrate; preferably, colours in paste form and organic or inorganic pigments are used.
  • The paper material just described is obtained, in accordance with a further aspect of the present invention, with the method described below.
  • First the substrate is provided with techniques of formation of paper that are substantially known, for example, on a paper machine.
  • Basically, an aqueous pulp is provided constituted by cellulose fibres, said pulp containing the polymeric substance (colophony-based and/or alkyl-ketene-dimer-based and/or acetyl-succinic-acid-based and/or epichlorohydrin-based resins, and/or modified starches) and the inorganic filler (carbonates, kaolins, talc, etc.).
  • Next, water is removed from the pulp to form the substrate of the paper material.
  • This is followed by a step of surface treatment of one or both of the faces of the substrate with an aqueous solution of surface adhesive, for example, made up of an aqueous solution of starch (10 wt%), and/or acrylic adhesive (5 wt%), or adhesives similar to the ones described previously (adhesives with a base of polyvinyl alcohol and/or of acrylic, polyurethane and/or styrene-butadiene polymers).
  • The treatment with the surface adhesive has also the purpose of bestowing on the paper material a correct penetration of water, indispensable for the subsequent coating step.
  • The method then comprises, after the surface treatment with adhesive, a step of smoothing of the substrate, where the substrate is smoothed up to Bendsten ISO 2494 roughness values of less than 50 ml/min and preferably of less than 30 ml/min, and indicatively 20 ml/min.
  • Next, the glossy coating described above is applied.
  • Preferably, application of the glossy coating is performed by spreading carried out with an air-blade or smoothing-blade coating machine, and is followed by a step of drying of the coating, conducted in an infrared oven and/or hot-air oven at a temperature of between 100°C and 180°C and with an oven time of between 0.5 and 4 minutes.
  • Finally, the method comprises a step of mechanical treatment of the surface provided with the coating, in particular a smoothing step and/or an embossing step.

Claims (16)

  1. A sand-rough-effect paper material, comprising a substrate, formed by a mixture of cellulose fibres containing at least one polymeric substance, apt to bestow strength on the mixture of fibres, and an inorganic filler; and having at least one surface treated with at least one surface adhesive and provided with a glossy coating formed by one or more binding polymers and/or waxes, mixed with pigments; and wherein the pigments comprise pigments with a base of calcium silicate so that the paper material has a sand-like rough feel, the calcium-silicate-based pigments having variable grain size and degree of whiteness higher than 85 according to the DIN 5033 standard.
  2. The paper material according to Claim 1, wherein the polymeric substance included in the substrate comprises one or more colophony-based and/or alkyl-ketene-dimer-based and/or acetyl-succinic-acid-based and/or epichlorohydrin-based resins, and/or modified starches.
  3. The paper material according to Claim 1 or Claim 2, wherein the inorganic filler is a mineral filler and comprises one or more substances selected in the group consisting of carbonates, kaolins, talc, and mixtures thereof.
  4. The paper material according to any one of the preceding claims, wherein the surface adhesive is an adhesive with a base of starch and/or polyvinyl alcohol and/or acrylic, polyurethane and/or styrene-butadiene polymers.
  5. The paper material according to any one of the preceding claims, wherein the glossy coating comprises pigments with a lamellar or flat structure, such as, for example, precipitated calcium carbonate (PCC), kaolins for coating, calcined and/or lamellar kaolins, in combination with the calcium-silicate-based pigments.
  6. The paper material according to any one of the preceding claims, wherein the binding polymers comprise polyurethane-based, acrylic-based, polyvinyl-alcohol-based, styrene-butadiene-based and/or silicone-based polymers.
  7. A method for manufacturing the paper material according to any one of the preceding claims, comprising the steps of:
    (a) preparing an aqueous pulp of cellulose fibres containing at least one polymeric substance, apt to bestow strength on the mixture of fibres, and an inorganic filler;
    (b) removing water from the pulp to form a substrate of the paper material;
    (c) treating at least one surface of the substrate with at least one surface adhesive in such a way as to bestow on the substrate characteristics of water penetration suitable for a subsequent coating step; and
    (d) applying to the surface treated a glossy coating formed by one or more binding polymers and/or waxes, mixed with pigments comprising calcium-silicate-based pigments so that the paper material has a sand-like feel, wherein the calcium-silicate-based pigments have variable grain size and degree of whiteness higher than 85 according to the DIN 5033 standard.
  8. The method according to Claim 7, wherein the polymeric substance included in the substrate comprises one or more colophony-based and/or alkyl-ketene-dimer-based and/or acetyl-succinic-acid-based and/or epichlorohydrin-based resins, and/or modified starches.
  9. The method according to Claim 7 or Claim 8, wherein the inorganic filler is a mineral filler and comprises one or more substances selected in the group consisting of carbonates, kaolins, talc, and mixtures thereof.
  10. The method according to any one of Claims 7 to 9, wherein the surface adhesive is an adhesive with a base of starch and/or polyvinyl alcohol and/or acrylic, polyurethane and/or styrene-butadiene polymers.
  11. The method according to any one of Claims 7 to 10, wherein the glossy coating comprises pigments with a lamellar or flat structure, such as, for example, calcium carbonate, precipitated calcium carbonate (PCC), calcined and/or lamellar kaolins, kaolins for coating in combination with the calcium-silicate-based pigments.
  12. The method according to any one of Claims 7 to 11, wherein the binding polymers comprise polyurethane-based, acrylic-based, polyvinyl-alcohol-based, styrene-butadiene-based and/or silicone-based polymers.
  13. The method according to any one of Claims 7 to 12, comprising, after the surface treatment with adhesive, a step of smoothing of the substrate, wherein the substrate is smoothed up to Bendsten ISO 2494 roughness values of less than 50 ml/min, preferably of less than 30 ml/min, and indicatively 20 ml/min.
  14. The method according to any one of Claims 7 to 13, wherein the step of application of the glossy coating is performed with an air-blade or smoothing blade coating machine.
  15. The method according to any one of Claims 7 to 14, comprising a step of drying of the glossy coating, conducted in an infrared oven and/or hot-air oven at a temperature of between 100°C and 180°C and with an oven time of between 0.5 and 4 minutes.
  16. The method according to any one of Claims 7 to 15, comprising a step of mechanical treatment of the surface provided with the glossy coating, in particular a smoothing step and/or an embossing step.
EP12167036.8A 2011-05-06 2012-05-07 Sand-effect paper material and corresponding manufacturing method Active EP2520709B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000779A ITMI20110779A1 (en) 2011-05-06 2011-05-06 SAND MATERIAL WITH EFFECT - SAND AND ITS MANUFACTURING PROCEDURE

Publications (2)

Publication Number Publication Date
EP2520709A1 EP2520709A1 (en) 2012-11-07
EP2520709B1 true EP2520709B1 (en) 2016-03-30

Family

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EP12167036.8A Active EP2520709B1 (en) 2011-05-06 2012-05-07 Sand-effect paper material and corresponding manufacturing method

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EP (1) EP2520709B1 (en)
ES (1) ES2579057T3 (en)
IT (1) ITMI20110779A1 (en)
PT (1) PT2520709T (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130979A1 (en) * 2013-06-13 2014-12-14 Gruppo Cordenons Spa PAPER MATERIAL WITH HOLOGRAPHIC AND METAL PERLESCENT EFFECT AND RELATIVE PROCESS OF MANUFACTURE
US9777143B2 (en) 2014-04-11 2017-10-03 Georgia-Pacific Consumer Products Lp Polyvinyl alcohol fibers and films with mineral fillers and small cellulose particles
US9777129B2 (en) 2014-04-11 2017-10-03 Georgia-Pacific Consumer Products Lp Fibers with filler
CN104674596B (en) * 2015-02-05 2016-12-07 骏源新材料（上海）有限公司 A kind of preparation method of sense of touch paper
ITUB20160512A1 (en) * 2016-02-01 2017-08-01 Gruppo Cordenons Spa PAPER MATERIAL WITH A HIGH SOLID METAL PERLESCENT EFFECT IN LIGHT AND ITS MANUFACTURING PROCEDURE
ITUA20161829A1 (en) * 2016-03-18 2017-09-18 Gruppo Cordenons Spa TISSUE PAPER FOR HYGIENIC AND SANITARY USE AND ITS PROCESS OF PROCESSING
IT202100032753A1 (en) * 2021-12-28 2023-06-28 Gruppo Cordenons Spa TOTALLY CLOSURE PAPER MATERIAL PARTICULARLY FOR USE IN THE FOOD INDUSTRY

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4118340C2 (en) * 1991-06-04 1996-07-11 Drescher Geschaeftsdrucke Process for the manufacture of a paper product, paper product produced thereafter and use of the same
US5334286A (en) * 1993-05-13 1994-08-02 The Procter & Gamble Company Tissue paper treated with tri-component biodegradable softener composition
DE19706574C2 (en) * 1997-02-20 1999-07-08 Stora Publication Paper Ag Paper coated with a coating method, process for its production and its use
US6607637B1 (en) * 1998-10-15 2003-08-19 The Procter & Gamble Company Soft tissue paper having a softening composition containing bilayer disrupter deposited thereon
KR20070028249A (en) * 2005-09-07 2007-03-12 오지 세이시 가부시키가이샤 Coated paper

Also Published As

Publication number Publication date
PT2520709T (en) 2016-07-11
ES2579057T3 (en) 2016-08-04
EP2520709A1 (en) 2012-11-07
ITMI20110779A1 (en) 2012-11-07

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