EP1156930A1 - Papier de copie recouvert de plusieurs couches permettant une impression et une performance ameliorees - Google Patents

Papier de copie recouvert de plusieurs couches permettant une impression et une performance ameliorees

Info

Publication number
EP1156930A1
EP1156930A1 EP99968179A EP99968179A EP1156930A1 EP 1156930 A1 EP1156930 A1 EP 1156930A1 EP 99968179 A EP99968179 A EP 99968179A EP 99968179 A EP99968179 A EP 99968179A EP 1156930 A1 EP1156930 A1 EP 1156930A1
Authority
EP
European Patent Office
Prior art keywords
layer
basecoat
copy paper
paper
layer coated
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.)
Withdrawn
Application number
EP99968179A
Other languages
German (de)
English (en)
Inventor
Peter J. Veverka
Bruce Lyne
Chialu Chang
Gert Hilden
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.)
International Paper Co
Original Assignee
International Paper Co
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
Application filed by International Paper Co filed Critical International Paper Co
Publication of EP1156930A1 publication Critical patent/EP1156930A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/0013—Inorganic components thereof
    • 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
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • 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
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/506—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate

Definitions

  • This invention generally relates to multi-layer coated copy paper, and more particularly, to paper having thermally insulating basecoat layers between a basecoat paper layer and outer topcoat layers .
  • coated papers were not specifically designed to function in color or monochrome copiers. While the use of coating layers to prevent copy blistering has been known, coated or layered paper structures have not been specifically designed to optimize the print quality of toner in copiers, to reduce the amount of power required for toner copying, and possibly to lower the amount of toner usage required for printing with comparable copy quality. Summary of Invention
  • a multi-layer coated copy paper comprises a base paper layer of paper pulp, an outer topcoat layer including mineral pigments and fine clay, with a binder, and an intermediate basecoat layer between the base paper layer and outer topcoat layer containing from 10% to 70% ground calcium carbonate (CaC0 3 ) , from 90% to 30% fully or partially calcined clay (Si 4 Al 4 O 10 (OH) n , where n ⁇ 8), and from 0% to 30% satin white (3CaO-Al 2 0 3 -3CaS0 4 -31H 2 0) , with a binder.
  • the coating weight of the intermediate basecoat layer is preferably from 10 to 14 gsm.
  • the basecoat and topcoat layers may be formed on one or both sides of the base paper layer.
  • FIG. 1 shows in cross-section a multi-layer coated copy paper structure in accordance with the invention.
  • FIG. 2 is a sample graph showing surface temperatures as a function of time of three commercial samples and an improvement sample during a ten-copy cycle.
  • FIG. 3 shows a comparison between a commercial sample and an improvement sample for the numerical integral of the area under the temperature vs. time curve.
  • FIG. 4 shows the relationship between the numerical integral of temperature over time with the weight % of calcined clay in the total sheet.
  • FIG. 5 is a graph comparing the heat diffusivity of the basecoat for different levels of calcined clay and different types (fine or coarse) of ground calcium carbonate .
  • a multi-layer coated copy paper in accordance with the invention has a base paper layer ( "Basepaper” ) of paper pulp, an outer topcoat layer
  • Topcoat of mineral pigments and fine clay together with a binder, and an intermediate base coating layer (“Basecoat”) between the base paper layer and outer topcoat layer.
  • Basecoat intermediate base coating layer
  • FIG. 1 a two-sided copy paper structure is shown in which Topcoat and Basecoat layers are provided on both sides of the Basepaper layer.
  • the upper side of the Basepaper layer is indicated as the “felt side”
  • the lower side is indicated as the “wire side”, referring to the sides of the paper web between the forming wire it is carried on and the felt it is pressed with during the paper forming process.
  • the felt side of the coated paper is the preferred side to be copied on (instructions are commonly marked on paper reams to "Copy this Side First"), as the felt side has the better gloss and finish characteristics. Therefore, a toner area (“Toner”) is indicated as formed on the felt side of the coated paper.
  • the felt-side Topcoat is indicated as having a thickness y(l), felt-side Basecoat thickness x(l), Basepaper thickness z, wire-side Basecoat thickness x(2), and wire-side Topcoat thickness y(l) .
  • the relative thicknesses of the preferred multi-layer coated copy paper are as follows:
  • the Basecoat is formed with a combination of bulky minerals to give it the preferred properties: thermal insulation; porosity/bulk; opacity; brightness; and conductivity. The following combination and ranges have been found to produce optimal results:
  • the ratio of mineral pigments (b) and (c) to ingredient (a) in the Basecoat layer is preferably in the range of from 9:1 to 1:1.8, with the exact ratio dependent on the thermal insulating requirements for the Basecoat layer as a function of its basis weight.
  • the ratios of ingredients in the Basecoat layer can be optimized so that the resulting thermal insulation properties allow the fusing process to be independent of basis weight .
  • the 21 improvement samples had a basecoat layer of varying composition.
  • the component ingredients for the basecoat layer were: Ansilex 93 (TM) calcined clay, obtained from Engelhard Corporation, located in Iselin, New Jersey (USA) ; Hydrocarb-CC (TM) calcium carbonate (fine pore size diameter) , obtained from OMHY PLUSS-STAUFER AG, in Oftringen, Switzerland (designated HC-CC) ; Hydrocarb-60 (TM) calcium carbonate (coarser pore size diameter) ; Flash calcined clay sold under the product name 97-7000, from ECC International located in Cornwall, England; and satin white (SW) or calcium sulfoaluminate manufactured under a proprietary process at Zanders Feinpapier AG (Bergish Gladbach, Germany) .
  • a commercial satin white product of similar composition is Suprasmit Satin White sold by Suprasmit B.V. located in Maastricht, Netherlands.
  • the compositions of the samples were:
  • the output data for the three commercial samples were compared to improvement trial sample Dl, which contained 90 parts of Ansilex 93 and 10 parts Hydrocarb-CC as the composition of the basecoat.
  • the samples had total basis weights ranging from 120 gsm to 135 gsm, for comparison in the heavy-weight (105-210 gsm) copying mode.
  • the results showed that the improvement sample with the thermally insulating basecoat layer had maximum surface temperatures up to 10°C (18°F) cooler than the commercial products. This indicates that the improvement sample would have reduced blocking because, with lower sheet temperatures in the stacking tray, the toner would drop below its melting temperature T g more quickly.
  • the power requirements for copying are also reduced by as much as 20%, thereby allowing increased throughput (copies/minute) .
  • An alternative method would be to measure the current draw (amperage) on the fuser roll required to keep the roll surface at the setpoint .
  • Print gloss measurements with the 20 -degree glossmeter were much more sensitive to changes in the surface reflectance and smoothness than with a 75 -degree glossmeter (more representative of the normal viewing angle to the sheet) .
  • a difference of 15-16% in 20-degree measured print gloss is equivalent to only 1-2% in 75-degree measured print gloss .
  • the use of a thermally insulating basecoat layer between the base paper layer and the top coat layer in coated copy paper promotes faster copying with heavier papers, avoids "blocking" in sheet stacking, better print quality, and eliminates blistering of paper as compared with commercially available coated papers lacking the basecoat layer.
  • the basecoat layer acts as a thermally insulating layer which keeps residual heat from toner fusing near the topcoat layers and away from penetrating into the inner layers . This enables toner fusing with less energy input, which will allow greater throughput (copies/minute) with both standard and heavier paper weight grades.
  • the benefits of increased throughput (copies/minute) and elimination of blocking can be extended to sheeted paper as well as paper running through the copier as a continuous web.
  • the multi- layered product also provides approximately 10% higher sheet bulk and stiffness due to the lower nip loading required for sheet finishing during the gloss calendering process.
  • the higher paper stiffness will improve runnability during paper feeding, transporting, and duplexing in both monochrome and color copiers, especially at higher feed rates (copies/minute) .
  • the multi- layer coated copy paper also prevents the fusing process from transmitting excess heat into the base paper, thereby maintaining a higher temperature for a given energy input near the surface during toner fusing. This results in better print characteristics, measured in terms of print gloss and density.

Abstract

L'invention concerne un papier de copie recouvert de plusieurs couches, comprenant une sous-couche intermédiaire placée entre la couche de papier de base et la couche extérieure de revêtement supérieur, contenant de 10 % à 70 % de carbonate de calcium précipité (CaCO3), de 90 % à 30 % d'argile partiellement ou complètement calcinée (Si4Al4O10(OH)n' où n∫8), et de 0 % à 30 % de pâte satin (3CaO-Al2O3-3CaSO4-31H2O), et un liant.
EP99968179A 1998-12-30 1999-12-23 Papier de copie recouvert de plusieurs couches permettant une impression et une performance ameliorees Withdrawn EP1156930A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US11426098P 1998-12-30 1998-12-30
US114260P 1998-12-30
US47104499A 1999-12-22 1999-12-22
US471044 1999-12-22
PCT/US1999/030817 WO2000040424A1 (fr) 1998-12-30 1999-12-23 Papier de copie recouvert de plusieurs couches permettant une impression et une performance ameliorees

Publications (1)

Publication Number Publication Date
EP1156930A1 true EP1156930A1 (fr) 2001-11-28

Family

ID=26811988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99968179A Withdrawn EP1156930A1 (fr) 1998-12-30 1999-12-23 Papier de copie recouvert de plusieurs couches permettant une impression et une performance ameliorees

Country Status (4)

Country Link
EP (1) EP1156930A1 (fr)
AU (1) AU2485200A (fr)
NO (1) NO20013292L (fr)
WO (1) WO2000040424A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1501982A1 (fr) 2002-05-03 2005-02-02 Imerys Minerals Limited Pigments de revetement de papier
US7608338B2 (en) 2002-06-13 2009-10-27 International Paper Company High brightness coating compositions and related products
US7018708B2 (en) * 2002-08-22 2006-03-28 International Paper Company Gloss-coated paper with enhanced runnability and print quality
US20060246262A1 (en) * 2005-04-29 2006-11-02 Svante Roding Blister board with enhanced heat seal characteristics

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4377612A (en) * 1981-05-22 1983-03-22 Monsanto Company Electrographic recording material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0040424A1 *

Also Published As

Publication number Publication date
WO2000040424A1 (fr) 2000-07-13
NO20013292L (no) 2001-08-28
NO20013292D0 (no) 2001-07-02
AU2485200A (en) 2000-07-24

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Inventor name: HILDEN, GERT

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