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EP0879917B1 - Composition pour le traitement du papier - Google Patents

Composition pour le traitement du papier Download PDF

Info

Publication number
EP0879917B1
EP0879917B1 EP98303925A EP98303925A EP0879917B1 EP 0879917 B1 EP0879917 B1 EP 0879917B1 EP 98303925 A EP98303925 A EP 98303925A EP 98303925 A EP98303925 A EP 98303925A EP 0879917 B1 EP0879917 B1 EP 0879917B1
Authority
EP
European Patent Office
Prior art keywords
paper
salt
treatment composition
toner
aluminate
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
EP98303925A
Other languages
German (de)
English (en)
Other versions
EP0879917A3 (fr
EP0879917A2 (fr
Inventor
David William Owen
Richard David Saunders
Derek Sutton
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
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 Arjo Wiggins Fine Papers Ltd filed Critical Arjo Wiggins Fine Papers Ltd
Priority to DK98303925T priority Critical patent/DK0879917T3/da
Publication of EP0879917A2 publication Critical patent/EP0879917A2/fr
Publication of EP0879917A3 publication Critical patent/EP0879917A3/fr
Application granted granted Critical
Publication of EP0879917B1 publication Critical patent/EP0879917B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
    • G03G7/0066—Inorganic components 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents

Definitions

  • This invention relates to the use of a treatment composition for enhancing the suitability of paper for printing by so-called "colour digital presses" of the kind which use a liquid toner or ink.
  • Colour digital presses were first commercialised on a significant scale around the early 1990's. They are particularly suited to short printing runs for which traditional colour offset printing can be uneconomic and slow because of the high cost and time penalties involved in producing printing plates and setting up the press at the start of the run. By contrast, a colour digital press has no printing plates or comparable set-up costs. It therefore permits a rapid response to print orders ("fast turnaround"), and the cost per impression is not significantly influenced by the total number of impressions being made. These factors make a digital press ideal for short-run colour printing, say for up to about 3000 impressions.
  • variable and non-variable information can be merged between every consecutively printed copy, so that individual impressions within a print run can be personalised or customised so as to be specific to a particular recipient or reader.
  • Colour digital press technology is based on non-impact printing or imaging technology of the same general kind as is used in plain paper photocopiers and laser printers, i.e. on the use of an electrostatically-charged roll and charged toner particles for image formation.
  • An electrostatically-charged photosensitive roll (the "photoreceptor") is exposed to light in an imagewise configuration such that the surface electrostatic charge on the exposed areas of the photoreceptor is dissipated. Toner is then brought into contact with the photoreceptor, and adheres strongly to it in the unexposed (and thus still electrostatically-charged) areas of its surface, from which it can be transferred to the paper either directly or indirectly via an offset roll.
  • a single pass through the printing unit provides a monochrome image, but a colour print of a quality comparable to that obtainable by traditional colour offset printing can be achieved either by multiple passes through a printing unit using differently-coloured toners or by a single pass through an array of printing units each of which applies a differently-coloured toner.
  • Typically four passes or printing units are used, three of which apply coloured toners and the other of which applies a black toner.
  • the coloured toners are such that when used individually and in suitable combinations, they can provide a complete spectral range for the finished print, in much the same way as is achieved in conventional colour printing by the use of a black and three differently-coloured inks.
  • toners are of a fine particulate nature, with each particle comprising pigment particles bound together in a thermally-fusible polymeric binder matrix. Once the toner has been applied to the paper, heat is used to melt the polymeric binder component of the toner and so "fuse” the toner particles together and to the paper.
  • liquid toners comprise toner particles dispersed in a fairly high-boiling organic liquid vehicle, together with dispersed binder particles.
  • the toner is heated to an elevated temperature (typically 70 - 90°C) sufficient to convert the binder particles to a liquid state. Removal of the vehicle results in an increase in toner viscosity, which facilitates transfer of the toner to the offset roll (if used) and to the paper, with the paper surface absorbing the residual liquid vehicle.
  • the binder reverts to a solid state after the toner has been applied to the paper and so fixes the image (there is no subsequent "fusing" of the toner after its transfer to the paper, such as occurs in dry toner processes).
  • the paper used with colour digital presses must be carefully chosen if good print quality and runnability through the digital press is to be achieved.
  • the paper requirements are similar to those for plain paper copying and laser printing, primarily a smooth surface, good stiffness, a relatively low moisture content, good dimensional stability under conditions of variable humidity, compatibility with toner so as to permit good toner adhesion and ability to withstand the heat of the toner fusing stage without excessive curling, wavy edge production or blistering.
  • Such papers are readily available at acceptable cost, and so paper availability has not been a significant constraint on market penetration of dry toner colour digital press technology.
  • WO-A-96/06384 discloses the use of polyethylene imine or derivatives thereof or polyamides to impart a basic functionality to paper for use as an imagine substrate in a liquid toner printing process with the result that improved image adhesion is obtained.
  • US-A-5 522 968 discloses the use of an alkali metal salt coating to impart an alkaline pH surface value to an ink jet printing paper.
  • the invention resides in the use, for the purpose of enhancing the printability of paper by means of a liquid toner colour digital press, of a treatment composition comprising an aluminate salt or a salt of a weak acid and a strong base in an amount such as to impart an alkaline surface pH value to the paper.
  • the invention provides a method of printing paper by means of a liquid toner colour digital press, characterised in that the paper being printed has been surface treated with an aluminate salt or a salt of a weak acid and a strong base in an amount such as to give an alkaline surface pH value.
  • the treatment composition comprising the aluminate salt or the salt of a weak acid and a strong base preferably contains starch or another surface agent, so that the treatment composition also functions as a surface sizing composition. This reduces the cost of the treatment (since no additional paper processing is required beyond the normal size press treatment). It also facilitates uniform application of the active treating ingredient (the salt) across the whole surface of the paper, since the sizing agent functions as an extender.
  • the surface size is typically a starch, but could in principle be a latex, polyvinyl alcohol, gelatin, a cellulose derivative such as carboxymethylcellulose, or other known surface sizing material. Combinations of these materials can be used.
  • Size press application is a particularly convenient and therefore preferred method of applying the treatment composition, coating, spraying or other application techniques can be used.
  • Size-presses as referred to in this application include not only traditional size presses but also so-called “metered” size presses of the kind commercialised under the name "Speedsizer” by Voith, “Sym-Sizer” by Valmet, “Twin-HSM” by BTG and “Filmpress” by Jagenberg.
  • the aluminate salt is preferably sodium aluminate, and the salt of a weak acid and a strong base is preferably sodium hydrogen carbonate (sodium bicarbonate). Less preferred alternatives include disodium tetraborate, trisodium phosphate and sodium acetate.
  • Sodium salts have been referred to because they are the most readily available, but it will be understood that the corresponding potassium salts could equally well be used, as could calcium salts, provided that they are adequately soluble.
  • Sodium aluminate has so far been found to give the best results, possibly because the presence of polyvalent aluminium enhances affinity to toner materials.
  • the amount of aluminate salt or salt of a weak acid and a strong base to be used varies in accordance with the type of paper being treated, for example its absorbence and inherent hold-out characteristics and the level and type of internal sizing used. Guidance as to suitable treatment levels is obtainable from the Examples given below. Generally the amount of aluminate or salt of a weak acid and a strong base will be such as to produce an alkaline surface pH value, for example 8 - 8.5 or higher.
  • a small amount of pigment e.g. colloidal precipitated calcium carbonate
  • the treatment composition if the effect is not such as to change the fundamental character of the final treated paper, i.e. to convert it from what would be perceived as an "uncoated" grade to a conventional coated product.
  • a 10% solution was prepared of an oxidised maize starch of the kind conventionally used for surface sizing of paper. This solution was divided into five batches. One of these was used as a control and the others were each made up into treatment compositions according to the invention by the addition of respective salts as listed below: Salt Mix Designation Disodiumtetraborate, Na 2 B 4 O 7 .10H 2 O A Sodium acetate trihydrate, NaC 2 H 3 O 2 .3H 2 O B Trisodium orthophosphate, Na 3 PO 4 .12H 2 O C Sodium aluminate, Na 2 Al 2 O 4 D ----- Control
  • the addition level of the salts was 1% on a dry basis in each case, calculated as weight of dry salt present (as the hydrate form where indicated) in relation to the weight of dry starch present. Starch therefore made up 99% of the treatment composition.
  • Each treatment composition was airknife-coated on to a smooth wove-finish 100 g m -2 business letterhead base paper stock by means of an intermediate-scale pilot coater.
  • This base paper had been internally-sized with alkyl ketene dimer (i.e. it was neutral/alkaline sized) and had also been conventionally surface-sized.
  • Two different coatweights of treating composition were applied, namely ca. 3 g m -2 and ca. 2 g m -2 (dry, in both cases).
  • the resulting reels were then sheeted to SRA3 size and test printed on a liquid toner colour digital press (an INDIGO E-PRINT 1000 press supplied by Indigo N.V. of the Netherlands).
  • the extent to which the various samples accepted the ink in a satisfactory manner was assessed visually, and the level of toner adhesion was assessed by "tape pull" and "rub toner adhesion” tests.
  • a batch of 2201 of an 8% solution of cationic potato starch was prepared. 3kg sodium hydrogen carbonate were dissolved in this solution with stirring to produce a treating composition of which starch comprised ca. 85%.
  • the resulting composition was fed to the size press of a paper machine producing a 90 g m -2 rosin/alum internally sized wove printing paper. The resulting paper was sheeted, printed and tested in the same way as in Example 1.
  • Example 1 This compares the results obtained with a sodium aluminate treatment composition applied by means of an intermediate scale coater in two different ways, namely by airknife coating and by means of a size press coating head.
  • the treatment composition was prepared as described with reference to Mix D of Example 1 and the dry coatweight applied was ca. 2 g m -2 in each case (per side in the case of the size press treated paper).
  • the paper to which the compositions were applied had not been surface sized but was otherwise as in Example 2. After treatment, the paper was sheeted, printed and tested as described in Example 1.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Glass Compositions (AREA)

Claims (10)

  1. Utilisation, dans le but d'améliorer l'imprimabilité du papier au moyen d'une presse numérique d'impression en couleurs par toner liquide, d'une composition de traitement comprenant un sel aluminate ou un sel d'un acide faible et d'une base forte dans une quantité prévue pour donner au papier une valeur de pH de surface correspondant à un pH alcalin.
  2. Utilisation selon la revendication 1, telle que la valeur de pH de surface donnée au papier est d'au moins 8.
  3. Utilisation selon la revendication 2, telle que la valeur de pH de surface donnée au papier est d'au moins 8,5.
  4. Utilisation selon toute revendication précédente, telle que la composition de traitement est une composition de collage en surface comprenant aussi un sel aluminate ou un sel d'un acide faible et d'une base forte.
  5. Utilisation selon toute revendication précédente, telle que le collage en surface comprend un amidon.
  6. Utilisation selon toute revendication précédente, telle que le collage en surface comprend un latex, un alcool polyvinylique, une gélatine, ou un dérivé de cellulose comme la carboxyméthylcellulose.
  7. Utilisation selon toute revendication précédente, telle que le sel aluminate est l'aluminate de sodium.
  8. Utilisation selon la revendication 1, telle que la composition de traitement comprend l'aluminate de sodium et un amidon cationique.
  9. Utilisation selon la revendication 1, telle que la composition de traitement comprend le bicarbonate de sodium et un amidon cationique.
  10. Méthode d'impression sur papier au moyen d'une presse numérique d'impression en couleurs par toner liquide, caractérisée en ce que le papier sur lequel a lieu l'impression, a subi un traitement de surface avec un sel aluminate ou un sel d'un acide faible et d'une base forte dans une quantité prévue pour produire une valeur de pH de surface correspondant à un pH alcalin.
EP98303925A 1997-05-20 1998-05-19 Composition pour le traitement du papier Expired - Lifetime EP0879917B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK98303925T DK0879917T3 (da) 1997-05-20 1998-05-19 Sammensætning til behandling af papir

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9710282.6A GB9710282D0 (en) 1997-05-20 1997-05-20 Treated paper
GB9710282 1997-05-20

Publications (3)

Publication Number Publication Date
EP0879917A2 EP0879917A2 (fr) 1998-11-25
EP0879917A3 EP0879917A3 (fr) 1999-11-10
EP0879917B1 true EP0879917B1 (fr) 2004-09-01

Family

ID=10812668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98303925A Expired - Lifetime EP0879917B1 (fr) 1997-05-20 1998-05-19 Composition pour le traitement du papier

Country Status (7)

Country Link
EP (1) EP0879917B1 (fr)
AT (1) ATE275219T1 (fr)
DE (1) DE69825938T2 (fr)
DK (1) DK0879917T3 (fr)
ES (1) ES2227775T3 (fr)
GB (1) GB9710282D0 (fr)
PT (1) PT879917E (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8252373B2 (en) 2004-05-24 2012-08-28 International Paper Company Gloss coated multifunctional printing paper
US9296244B2 (en) 2008-09-26 2016-03-29 International Paper Company Composition suitable for multifunctional printing and recording sheet containing same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346157A (en) 1999-01-28 2000-08-02 Rexam Coated Products Limited Surface-treated paper for use as recording medium
EP2092118A1 (fr) 2006-12-11 2009-08-26 International Paper Company Composition d'encollage de papier, papier encollé et procédé d'encollage de papier
DE102008029861A1 (de) * 2008-06-25 2009-12-31 Vits Systems Gmbh Vorrichtung und Verfahren zum Bedrucken und Imprägnieren/Beschichten einer Bahn
US8795818B2 (en) 2008-12-16 2014-08-05 Hewlett-Packard Development Company, L.P. Liquid toner digitally printable media
DE102013105192A1 (de) 2013-01-22 2014-07-24 Bamberger Kaliko Textile Finishing Gmbh Textilsubstrat zum Bedrucken mit Flüssigtinte in offset-ähnlichen Verfahren
TWI689469B (zh) * 2014-03-12 2020-04-01 美商藝康美國公司 廢水去汙

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61125879A (ja) * 1984-11-22 1986-06-13 Hokuetsu Seishi Kk 保存中における記録層面の変色を防止した感熱記録紙とその製造方法
JPH07100391B2 (ja) * 1991-08-15 1995-11-01 日本製紙株式会社 インクジェット記録用紙
WO1996006384A1 (fr) * 1994-08-25 1996-02-29 Indigo N.V. Procede de formation d'image

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8252373B2 (en) 2004-05-24 2012-08-28 International Paper Company Gloss coated multifunctional printing paper
US9296244B2 (en) 2008-09-26 2016-03-29 International Paper Company Composition suitable for multifunctional printing and recording sheet containing same
US9981288B2 (en) 2008-09-26 2018-05-29 International Paper Company Process for manufacturing recording sheet

Also Published As

Publication number Publication date
DE69825938T2 (de) 2005-09-15
ATE275219T1 (de) 2004-09-15
GB9710282D0 (en) 1997-07-16
DK0879917T3 (da) 2005-01-10
PT879917E (pt) 2005-01-31
ES2227775T3 (es) 2005-04-01
EP0879917A3 (fr) 1999-11-10
EP0879917A2 (fr) 1998-11-25
DE69825938D1 (de) 2004-10-07

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