EP0648894B1 - Cartons à imprimabilité améliorée - Google Patents

Cartons à imprimabilité améliorée Download PDF

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Publication number
EP0648894B1
EP0648894B1 EP94307214A EP94307214A EP0648894B1 EP 0648894 B1 EP0648894 B1 EP 0648894B1 EP 94307214 A EP94307214 A EP 94307214A EP 94307214 A EP94307214 A EP 94307214A EP 0648894 B1 EP0648894 B1 EP 0648894B1
Authority
EP
European Patent Office
Prior art keywords
pigment
paperboard
binder
oil absorbency
coating
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.)
Expired - Lifetime
Application number
EP94307214A
Other languages
German (de)
English (en)
Other versions
EP0648894A1 (fr
Inventor
Marie-Claude Ritt
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.)
Arjo Wiggins Fine Papers Ltd
Original Assignee
Arjo Wiggins Fine Papers Ltd
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Filing date
Publication date
Application filed by Arjo Wiggins Fine Papers Ltd filed Critical Arjo Wiggins Fine Papers Ltd
Publication of EP0648894A1 publication Critical patent/EP0648894A1/fr
Application granted granted Critical
Publication of EP0648894B1 publication Critical patent/EP0648894B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • 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

Definitions

  • This invention relates to paperboards of the kind used for making business cards, invitation cards, menu cards, covers for reports and such like.
  • paperboards are often referred to as Ivory Boards or Bristols. They are typically woodfree products having a grammage of 200 to 400 g m -2 or more, a thickness of 250 to 380 ⁇ m or more, and a calendered smooth surface finish (by a "woodfree product” is meant a product which consists essentially of chemical rather than mechanical pulp).
  • 200 g m -2 and 250 ⁇ m are not to be taken as absolute minimum values for grammage and thickness respectively of paperboards of the kind referred to - the expression "paperboard" as used in this specification extends at least to products of 180 g m -2 grammage and 150 ⁇ m thickness.
  • Set-off refers to transfer of still-wet ink from a printed card to the underside of the next card above it in a stack.
  • Ink rub refers to the tendency of still-wet ink printed on the card to smudge when in sliding or rubbing contact with another surface, for example the underside of the next card above it in a stack.
  • paperboard of the above-mentioned kind is surface sized, typically with starch, but is otherwise uncoated and is calendered to a smooth surface finish.
  • This smooth surface finish increases the tendency for set-off and ink rub to occur, since there are no pronounced "hill and valley” surface features.
  • "Hills" on adjacent sheets tend to prevent ink in the "valleys” from contacting and transferring to an adjacent sheet and also serve to shield ink in the "valleys” from rubbing forces.
  • Ink setting on paper products generally is usually the result of two complementary processes : absorption of the non-drying fraction of the ink, i.e. thin oil(s), often containing anti-oxidants to give storage stability, and oxidative polymerisation of the heavier resin based or "varnish" fraction left on the surface of the paper (this fraction also contains the ink pigments). In effect, a selective filtration of the ink occurs.
  • Pigment-coated papers or paperboards are particularly suited to high quality printing because the non-drying fraction of the ink is readily absorbed through the porous coating by capillary action, whereas the ink pigment and heavier varnish are left on the surface where they are of most effect. The varnish sets readily in the presence of oxygen and the absence of the thin oil component of the ink.
  • uncoated paperboard is not especially effective in selectively filtering the ink, because its relatively absorbent nature allows the heavier varnish component to be absorbed together with the thin oils.
  • ink setting takes longer, and the tendency for set-off and ink rub is increased, particularly if slow-setting inks are used.
  • Further drawbacks are that the adhesion of the pigment to the paper is reduced and the ink pigment tends to get carried into the paper rather than remaining on the surface, with the result that the final print has less brightness, sharpness and general visual appeal.
  • the last mentioned properties are very important where the presentational impact of the final product is important, as is the case with business cards, invitations, menu cards, report covers and the like.
  • high oil absorbency is meant a pigment with an oil absorbency of at least about 80 g/100 g pigment (as measured by ASTM Standard No. D2414). This compares with oil absorbency values of 40 g to 75 g/100 g pigment which are typical of kaolin, calcium carbonate or other coating pigments as conventionally used in coated papers and paperboards.
  • low coatweight is meant a coating which only partially covers, or barely covers, the surface of the paperboard and is such that the product substantially retains the appearance and properties present in a comparable uncoated board.
  • such a low coatweight coating has a coatweight in the range 1 to 5 g m -2 .
  • the much heavier coatweight coatings present in conventional coated paperboards typically have a coatweight of at least 7 g m -2 .
  • the present invention as described in claim 1 provides an improved printability ivory board, Bristol or similar paperboard of the kind used for making business cards, invitation cards, menu cards, report covers and the like, characterized in that the paperboard carries a low coatweight coating of a high oil absorbency pigment and a binder, said coatweight being from 1 to 5 gm -2 .
  • the high oil absorbency pigment may be, for example, an aluminosilicate, a synthetic amorphous silica, a calcined kaolin, or an acid-washed montmorillonite clay of the kind commonly used as a colour developer in pressure-sensitive copying paper and as disclosed in GB-A-1213835.
  • Suitable aluminosilicates are the products sold under the trade marks "Zeocopy” and "Zeolex 123" by Zeofinn Oy, of Hamina, Finland (subsidiary of J.M. Huber Corporation, U.S.A.).
  • the "Zeocopy” product was developed for use as a colour developer in pressure-sensitive copying paper and has an oil absorbency of c. 93g/100g pigment (100 ml/100 g pigment), a mean particle size of about 3.5 ⁇ m, as determined by means of a Coulter Counter, and a B.E.T. surface area of c. 230 m 2 g -1 (manufacturer's data in each case).
  • the "Zeolex 123" product was developed as a general filler and coating pigment for paper and has an oil absorbency of c. 84g/100g pigment (90 ml/100 g pigment), a mean particle size of about 3.0 ⁇ m, as determined by means of a Coulter Counter, and a B.E.T. surface area of 80 m 2 g -1 (manufacturer's data in each case).
  • Suitable silicas are products sold under the trade mark "Gasil” by Crosfield Group, of Warrington, England (subsidiary of Unilever, U.K.), particularly "Gasil 200 DF".
  • This product has an oil absorbency of c. 80 g/100 g pigment, a mean particle size of 5 ⁇ m, as determined by means of a Coulter Counter, and a B.E.T. surface area of 750 m 2 g -1 (manufacturer's data in each case).
  • a suitable calcined kaolin is the product sold under the trade mark "Ansilex 93" by Engelhard Corporation, U.S.A. This product has an oil absorbency of c. 90 g/100 g pigment, a mean particle size of about 0.8 ⁇ m, and a B.E.T. surface area of 16 m 2 g -1 (manufacturer's data in each case).
  • a suitable acid-washed montmorillonite clay is the product sold under the trade mark "Silton" by Mizusawa Industrial Chemicals Ltd., Japan. This product has an oil absorbency of c. 95 g/100 g pigment, a mean particle size of about 4.6 to 5.1 ⁇ m as determined by means of a Malvern Mastersizer, and a B.E.T. surface area of about 320 m 2 g -1 .
  • oil absorbency of about 80 g/100 g pigment represents an acceptable minimum threshold
  • higher oil absorbency pigments are preferred, for example pigments having an oil absorbency of at least 90 g/100 g.
  • the binder used is preferably a latex, typically a carboxylated styrene-butadiene copolymer latex such as that supplied as "DL 950" or “DL 930” by Dow Chemical.
  • a latex typically a carboxylated styrene-butadiene copolymer latex such as that supplied as "DL 950" or “DL 930” by Dow Chemical.
  • Other conventional paper coating binders can however be used, for example starch or polyvinyl alcohol, but these have so far been found to be less effective, perhaps because they "blind” the pigment in the coating, i.e. fill in the pores in the pigment surface and between adjacent pigment particles, so reducing the oil absorption capacity of the pigment coating.
  • the greater oleophilicity of styrenebutadiene copolymers, compared with starch or polyvinyl alcohol, is also thought to be significant.
  • Starch and polyvinyl alcohol also tend to have lower binding power than latex
  • the dry ratio of pigment to binder should be at least 1:1 and preferably is greater than this, say 2:1, 3:1 or 4:1 (the minimum usable optimum ratios depend on the particular pigment and binder used).
  • the coating is preferably applied at a size press on the papermachine on which the paperboard is produced.
  • the size press may be of the traditional kind, or may be of a modified design, for example a "Speedsizer” as supplied by Voith, a “Flexipress” as supplied by Jagenberg or a “Twin-HSM” as supplied by BTG.
  • other coating methods may be employed, provided they are suitable for the application of the desired low coatweights.
  • Air knife coating is one such method. For economic reasons, on-line coating is preferred.
  • the mean particle size of the pigment desirably should be not more than about 5 ⁇ m.
  • the dry pick-up of the pigment/binder coating should be typically of the order of 1% to 4%, preferably 2% to 3%, based on the weight of the uncoated paperboard in the case of size-press coating, i.e. two-side coating, and correspondingly less in the case of single-side coating. Since the basis weight of the paperboards in question is typically 200-230 g m -2 , typical dry coatweights per side are therefore in the range 1 to 5 g m -2 .
  • the coating mix can contain dispersants and other conventional additives.
  • the final dried coated product can be calendered to the desired final smoothness and surface appearance and "feel" in the same manner as for conventional uncoated paperboard.
  • compositions of 3:1 and 4:1 pigment:binder ratio were made up for each of binders (i) to (iii), the solids contents being of the order of 15-20% in each case.
  • compositions were each applied to a sample of paperboard by means of a laboratory size press at a range of pick-up values as specified below. After drying, the coated paperboards were each calendered to a Bendtsen smoothness value of the order of 80 to 100 ml min -1 and subjected to ink setting and print density testing as will now be described.
  • the reference paper was a pigment-coated paper of very high smoothness (1800 sec, Bekk) and low porosity (5 ml min -1 , Bendtsen).
  • the density of the image transferred, i.e. set-off on to the reference paper was then determined by means of a spectrophotometer (a reflectance of 0% indicates a completely black surface and a reflectance of 100% a completely white surface, i.e. the lower the reading, the worse the set-off).
  • the ink used was a duct stable (i.e. very slow setting) ink supplied by BASF under the trade mark "Accolade".
  • the IGT printability tester was also used to print samples for print-density testing, measurements in this case being made by a Gretag Densitometer. This works on the reflectance principle so that the higher the reading obtained, the more intense the print.
  • Example 1 This illustrates the use of certain of the coating compositions of Example 1 with a different type of ink, namely that supplied by BASF under the trade mark "Equinox".
  • This is a roller stable ink which is slow setting, but not as slow setting as the ink used in Example 1.
  • a composition with a 1:1 pigment:starch binder ratio was also evaluated.
  • Example 2 The procedure was generally as described in Example 1.
  • the pigment and binder used were "Zeocopy” aluminosilicate and styrene-butadiene latex in 4:1 ratio.
  • the ink used for testing was “Accolade” and the control was "Hi-Speed Ivory Board” both as referred to previously.
  • This Example illustrates the use of the invention on a fullsize paper machine equipped with a size press.
  • the paper machine was used to produce a conventional c.250 g m -2 paperboard of the general kind described in Example 1, with the size press being used to apply a low dry coatweight aqueous coating composition comprising an aluminosilicate pigment ("Zeocopy 131") and a styrene-butadiene latex binder ("Dow Latex 930").
  • the pigment:binder ratio was 4:1, and the solids content of the composition was 15%. Samples of the resulting product were taken at the start, middle and end of the production run.
  • Sample Pick up % SET-OFF INTENSITY AFTER Print Density 1 min 5 mins 10 mins 20 mins Aluminosilicate (4:1) 2.5 88 95 97 98 - Aluminosilicate (2:1) 2.5 84 87 92 94 2.1 Control (Calcite) 2.5 72 82 88 93 1.9 Control (kaolin) 2.5 79 88 91 95 2.0 Control (starch only) 2.5 75 83 87 91 1.8

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)

Claims (9)

  1. Carton-ivoire, bristol ou similaire présentant une aptitude à l'impression améliorée, du type employé pour des cartes de visite professionnelles, des cartes d'invitation, des cartes de menu, des couvertures de rapports et analogues, caractérisé en ce que le carton porte un revêtement de faible poids en revêtement de (a) un pigment ayant un pouvoir absorbant d'huile d'au moins environ 80 g/100 g de pigment, et (b) un liant, ledit poids en revêtement étant de 1 à 5 g m-2.
  2. Carton présentant une aptitude à l'impression améliorée selon la revendication 1, dans lequel le pigment à pouvoir absorbant élevé d'huile a un pouvoir absorbant d'huile d'au moins environ 90 g/100 g de pigment.
  3. Carton présentant une aptitude à l'impression améliorée selon l'une quelconque des revendications précédentes, dans lequel le pigment à pouvoir absorbant élevé d'huile est un aluminosilicate, une silice amorphe synthétique, un kaolin calciné ou une argile de type montmorillonite lavée à l'acide.
  4. Carton présentant une aptitude à l'impression améliorée selon l'une quelconque des revendications précédentes, dans lequel le liant est un latex styrène/ butadiène.
  5. Carton présentant une aptitude à l'impression améliorée selon l'une quelconque des revendications précédentes, dans lequel le rapport à sec du pigment à pouvoir absorbant élevé d'huile au liant est d'au moins 2:1, de préférence au moins 3:1.
  6. Carton présentant une aptitude à l'impression améliorée selon l'une quelconque des revendications précédentes, dans lequel le carton présente un grammage d'au moins 180 g m-2, de préférence de 200 à 400 g m-2.
  7. Carton présentant une aptitude à l'impression améliorée selon l'une quelconque des revendications précédentes, dans lequel le carton présente une épaisseur d'au moins 150 µm, de préférence de 250 µm à 380 µm.
  8. Carton présentant une aptitude à l'impression améliorée selon l'une quelconque des revendications précédentes, dans lequel le carton est de nature sans bois.
  9. Utilisation, dans le but d'améliorer l'aptitude à l'impression d'un carton-ivoire, bristol ou similaire du type employé pour faire des cartes de visite professionnelles, des cartes d'invitation, des cartes de menu, des couvertures de rapports et analogues, d'un revêtement à faible poids en revêtement de (a) un pigment ayant un pouvoir absorbant d'huile d'au moins environ 80 g/100 g de pigment, et (b) un liant, ledit poids en revêtement étant de 1 à 5 g m-2.
EP94307214A 1993-10-13 1994-10-03 Cartons à imprimabilité améliorée Expired - Lifetime EP0648894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9321171 1993-10-13
GB939321171A GB9321171D0 (en) 1993-10-13 1993-10-13 Improved printability paperboards

Publications (2)

Publication Number Publication Date
EP0648894A1 EP0648894A1 (fr) 1995-04-19
EP0648894B1 true EP0648894B1 (fr) 1999-02-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94307214A Expired - Lifetime EP0648894B1 (fr) 1993-10-13 1994-10-03 Cartons à imprimabilité améliorée

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EP (1) EP0648894B1 (fr)
DE (1) DE69416561T2 (fr)
GB (1) GB9321171D0 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2661800B2 (ja) * 1993-11-18 1997-10-08 アイティーティー・インダストリーズ・インコーポレーテッド ボード位置付け手段を有するｉｃカード
FR2845099B1 (fr) * 2002-09-30 2005-02-11 Arjo Wiggins Support d'impression possedant a la fois une bonne conductivite electrique et une bonne imprimabilite
CN1906358B (zh) 2003-12-26 2011-02-16 日本制纸株式会社 适用于报纸印刷油墨的涂布纸及其制造方法
FR2872180A1 (fr) * 2004-06-24 2005-12-30 Arjowiggins Papiers Couches So Papier revetu d'une composition pigmentee comportant de la silice imprimable par offset
EP1743775A1 (fr) * 2005-07-13 2007-01-17 SAPPI Netherlands Services B.V. Papier couche pour une presse offset à imprimer des feuilles

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377983A2 (fr) * 1988-12-22 1990-07-18 Nippon Paper Industries Co., Ltd. Papier journal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377983A2 (fr) * 1988-12-22 1990-07-18 Nippon Paper Industries Co., Ltd. Papier journal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Paper vocabulary - SIS Handbook 146", SIS - STANDARDISERINGSKOMMISSIONEN I SVERIGE, STOCKHOLM, SWEDEN *
J.P. CASEY: "Pulp and paper; Chemistry and chemical technology, 3rd edition, vol. IV", JOHN WILEY & SONS, NEW YORK *

Also Published As

Publication number Publication date
DE69416561T2 (de) 1999-09-23
GB9321171D0 (en) 1993-12-01
DE69416561D1 (de) 1999-03-25
EP0648894A1 (fr) 1995-04-19

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