EP1214471A1 - Papier d'impression couche, optiquement blanchi, et procede de fabrication de ce papier - Google Patents

Papier d'impression couche, optiquement blanchi, et procede de fabrication de ce papier

Info

Publication number
EP1214471A1
EP1214471A1 EP00966052A EP00966052A EP1214471A1 EP 1214471 A1 EP1214471 A1 EP 1214471A1 EP 00966052 A EP00966052 A EP 00966052A EP 00966052 A EP00966052 A EP 00966052A EP 1214471 A1 EP1214471 A1 EP 1214471A1
Authority
EP
European Patent Office
Prior art keywords
coating
optical brightener
solution
coated
application
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Withdrawn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
EP00966052A
Other languages
German (de)
English (en)
Inventor
Hubertus Burkhart
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.)
Stora Enso Publication Paper GmbH and Co KG
Original Assignee
Stora Enso Publication Paper GmbH and Co KG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7923016&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1214471(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Stora Enso Publication Paper GmbH and Co KG filed Critical Stora Enso Publication Paper GmbH and Co KG
Publication of EP1214471A1 publication Critical patent/EP1214471A1/fr
Withdrawn legal-status Critical Current

Links

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
    • D21H19/80—Paper comprising more than one coating
    • 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
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/50—Spraying or projecting
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls

Definitions

  • the invention relates to a coated, optically brightened printing paper according to the preamble of claim 1 and a method for its production according to the preamble of claim 4.
  • optical brighteners are also known. In addition to their main area of application in the detergent industry, they have also been used in the paper industry for decades to increase the whiteness of the paper produced. From a chemical point of view, optical brighteners are derivatives of diaminostilbenedisulfonic acid. Their effect is based on the absorption of UV light in a wavelength range of 300 - 400 nm and radiation in the blue range of visible light in the range of 400 - 450 nm. This leads to a shift in the yellow cast of fibers and fillers in the blue white range and ultimately to an increase in the spectral reflection factor.
  • Optical brighteners can be used in various ways during papermaking. When producing coated printing paper, it can be added to the fiber suspension before the headbox of the paper machine. If the paper machine has a so-called size press for surface treatment of the paper, the optical brightener can be added, for example, to the starch solution used there. A third possibility is to meter the optical brightener into a coating color which is applied inside or outside the paper machine to the coating base paper or, if appropriate, to an already coated base paper.
  • a device for applying glue liquors in addition to the known size press is disclosed by DE-A-34 17 487, where a paper web guided around a roller is treated with coating color on the front and with liquid media on the back.
  • EP-A-0 373 276 describes a method and an apparatus for continuously spraying additives onto a moving paper web.
  • Coated, optically brightened papers made in accordance with the prior art have certain disadvantages.
  • the optical brightener is added to the fiber suspension before the headbox or applied to the surface of the coating base paper by means of a size press, the subsequently applied coating layer dampens the UV light and the remitted blue light, so that the effect of the optical brightener is insufficient. An increase in the additional quantity is prohibited for cost reasons.
  • An addition of the optical brightener in the coating color to be applied is in principle possible, but requires the addition of so-called carrier substances, since the optical brightener itself does not adhere to the pigments of the coating color and therefore, for. T. strikes away with the water of the coating color in the base paper. This problem was solved by adding carrier substances. These are e.g. B. starch, CMC and polyvinyl alcohol. Due to their anionic charge, they are able to hold the cationically charged optical brightener in the applied coating color layer and to bring it into effect under the influence of light.
  • the disadvantage of using carrier substances is their relatively high intrinsic viscosity in aqueous solution, which adds to the already relatively high viscosity of the coating color used.
  • this leads to viscosity problems which either limit the working speeds, lead to uneven coating applications or require thinning of the coating color, which in turn leads to problems with the drying capacity of the downstream drying device.
  • the object of the present invention is to provide a coated, optically brightened printing paper and a method for the production thereof, which overcomes the problems mentioned above overcomes.
  • a one-sided or double-sided, single or multiple coated, optically brightened printing paper which consists of a coating base paper and a coating layer applied thereon of pigment, binder and coating color aid, which is characterized in that the optical brightener on the Is arranged outside of a coat layer.
  • One-sided coated printing paper means papers of this type which are only intended for one-sided printing. These include e.g. B. Label papers for bottles and can bands. Correspondingly, coated papers coated on both sides are printed on both sides. These include e.g. B. so-called magazine papers for magazines or catalogs, but also art paper. High-quality printed products require the highest surface quality of the page to be printed. This can no longer be achieved with a single line. That is why the coating base paper is first coated with one or two so-called primers and the so-called top coat is arranged on it.
  • All common coating pigments such as kaolin, calcium carbonate, talc, titanium dioxide, gypsum, etc., are suitable as pigments for the coat layer.
  • coating color binders such as starch, protein, casein, plastic latices, etc.
  • the coating layer also contains conventional coating color aids, such as defoamers, deaerators, lubricants and viscosity regulators. Pigments, binders and coating color auxiliaries are active in this area Expert familiar.
  • the arrangement of the optical brightener on the outside of the coat layer means that it is arranged both on the outside of the coat layer and in the outer layer below the outside.
  • the always present porosity of the coating layer possibly also after a previous smoothing process, has the effect of this arrangement with the advantageous effect that UV portion of the light hits the optical brightener with little or no attenuation and as visible blue light in the range from 400 to 450 nm is emitted with little or no attenuation, which shifts the yellow tinge of the fibers and pigments into the blue white area. This ultimately leads to an increase in the spectral reflection factor and to an improvement in the paper quality.
  • a reduction in the amount of brightener is also possible because of the improved mode of operation, so that a cost reduction is possible.
  • the optical brightener is arranged on the outside of the top coat of a coat layer consisting of one or more primers and a top coat.
  • This version has the advantage that the white quality of the pre-coat pigments does not have to be too high, since the lower whiteness of these pigments is compensated for by the brightening effect on the outer layer of the top coat. This makes it possible to reduce costs.
  • the optical brightener is arranged on the outside of a first coat layer and, above that, another coat layer without an optical brightener is arranged. It is known that optical Brighteners are destroyed by constant exposure to UV light and the paper turns gray. On the other hand, however, it cannot be avoided in certain applications of optically brightened printing paper that it is constantly exposed to the light. This applies e.g. B. with illuminated advertising posters. In this case, the optical brightener arranged on a first coat layer is protected from too much UV light by the further coat layer arranged above it, without losing its brightening effect.
  • a method according to the invention for producing optically brightened printing paper coated on one or both sides, one or more coats is characterized by the combination of the following features:
  • a coating base paper containing cellulose and / or wood pulp and / or recycling fibers and / or fillers is coated with a coating color containing white pigments, binders and coating color aids in a manner known per se by roller, nozzle, doctor blade or doctor application.
  • the applied coating is dried directly in a manner known per se by means of infrared emitters, hot air or cylinder contact. A combination of the different drying systems is also possible.
  • An aqueous solution containing an optical brightener is then applied to the dried top of the coat layer and dried again.
  • roller applicators can be used to apply the aqueous solution.
  • Another tried and tested application technique is the nozzle application of the aqueous solution.
  • Such nozzle applicators are familiar to the person skilled in the art.
  • a preferred embodiment of the method is that the application of the aqueous solution is carried out on one or both sides of the coated paper web by means of a roller or nozzle moistener, the solution of the optical brightener being added to the fountain solution. This embodiment is particularly useful when a moisture correction has to be carried out on the coated paper web.
  • the aqueous solution of the optical brightener can be applied in the coating machine directly downstream of the paper machine or in a coating machine which is operated separately. However, it is also possible to apply the aqueous solution of the optical brightener to the smoothed coat layer in a remoistening device arranged after a calender, the solution of the optical brightener being added to the fountain solution.
  • the binder contained in the coat layer has carrier properties, such as starch, polyvinyl alcohol or CMC, then a purely aqueous solution of an optical brightener can be used for application. However, if the coating layer lacks these carrier properties, then a water-soluble carrier such as starch, CMC or polyvinyl alcohol is added to the aqueous solution.
  • carrier properties such as starch, polyvinyl alcohol or CMC
  • a water-soluble carrier such as starch, CMC or polyvinyl alcohol
  • a wood-containing, pre-coated paper was provided with an additional top coat with an application weight of 8 g / m 2 .
  • the primer and top coat contained no optical brightener.
  • the whiteness of the coated paper was 75.2%.
  • a 10% aqueous solution of an optical brightener was then applied to the top coat and dried.
  • the absolutely dry application quantity of optical brightener was 0.32 g / m 2 of merchandise. The whiteness increased to 97.1%.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne un papier d'impression couché, optiquement blanchi, composé d'un support de couche et d'une couche de couchage appliquée sur ce support, composée de pigment, de liant, et d'un auxiliaire de teinture de couchage. Ce papier d'impression est caractérisé en ce que l'agent de blanchiment optique est disposé sur le côté extérieur de la couche de couchage. L'invention concerne également un procédé de fabrication d'un papier d'impression couché, optiquement blanchi, caractérisé par la combinaison des étapes suivantes, un support de couche est revêtu de manière connue d'une teinture de couchage composée de pigment blanc et de liant, au moyen d'une application au rouleau, par buse, à la raclette, ou au grattoir; le revêtement est séché de manière connue par rayonnement IR, air chaud, ou contact cylindrique; et une solution aqueuse contenant un agent de blanchiment optique est appliquée sur la surface séchée de la couche de couchage et éventuellement séchée à nouveau.
EP00966052A 1999-09-23 2000-09-19 Papier d'impression couche, optiquement blanchi, et procede de fabrication de ce papier Withdrawn EP1214471A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19945580A DE19945580C5 (de) 1999-09-23 1999-09-23 Gestrichenes, optisch aufgehelltes Druckpapier und Verfahren zu dessen Herstellung
DE19945580 1999-09-23
PCT/EP2000/009140 WO2001021891A1 (fr) 1999-09-23 2000-09-19 Papier d'impression couche, optiquement blanchi, et procede de fabrication de ce papier

Publications (1)

Publication Number Publication Date
EP1214471A1 true EP1214471A1 (fr) 2002-06-19

Family

ID=7923016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00966052A Withdrawn EP1214471A1 (fr) 1999-09-23 2000-09-19 Papier d'impression couche, optiquement blanchi, et procede de fabrication de ce papier

Country Status (6)

Country Link
US (1) US6773549B1 (fr)
EP (1) EP1214471A1 (fr)
CA (1) CA2385365A1 (fr)
DE (1) DE19945580C5 (fr)
NO (1) NO20021423L (fr)
WO (1) WO2001021891A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10138631A1 (de) 2001-08-13 2003-02-27 Basf Ag Verfahren zur Herstellung von beschichtetem Papier mit hoher Weiße
US20060038314A1 (en) * 2001-11-27 2006-02-23 Capaldo Kevin P Method for producing low birefringence plastic film
US20060191654A1 (en) * 2005-02-25 2006-08-31 John Theisen Paper product and method for manufacturing
US7893244B2 (en) * 2005-04-12 2011-02-22 Intradigm Corporation Composition and methods of RNAi therapeutics for treatment of cancer and other neovascularization diseases
US8980504B2 (en) * 2006-05-11 2015-03-17 Xerox Corporation Substrate fluorescence mask utilizing a multiple color overlay for embedding information in printed documents
US8283004B2 (en) * 2006-05-11 2012-10-09 Xerox Corporation Substrate fluorescence pattern mask for embedding information in printed documents
US8277908B2 (en) * 2006-05-11 2012-10-02 Xerox Corporation Substrate fluorescence mask for embedding information in printed documents
US7622022B2 (en) 2006-06-01 2009-11-24 Benny J Skaggs Surface treatment of substrate or paper/paperboard products using optical brightening agent
US7800785B2 (en) 2007-05-29 2010-09-21 Xerox Corporation Methodology for substrate fluorescent non-overlapping dot design patterns for embedding information in printed documents
US8821996B2 (en) 2007-05-29 2014-09-02 Xerox Corporation Substrate fluorescent non-overlapping dot patterns for embedding information in printed documents
US8460781B2 (en) * 2007-06-05 2013-06-11 Xerox Corporation Infrared encoding of security elements using standard xerographic materials
US8455087B2 (en) * 2007-06-05 2013-06-04 Xerox Corporation Infrared encoding of security elements using standard xerographic materials with distraction patterns
US8009329B2 (en) * 2007-11-09 2011-08-30 Xerox Corporation Fluorescence-based correlation mark for enhanced security in printed documents
US20130189457A1 (en) 2012-01-23 2013-07-25 International Paper Company SEPARATED TREATMENT OF PAPER SUBSTRATE WITH MULTIVALENT METAL SALTS AND OBAs
ES2959753T3 (es) 2018-09-14 2024-02-28 Archroma Ip Gmbh Látex ópticamente abrillantados

Family Cites Families (12)

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DE2322685C3 (de) * 1973-05-05 1978-05-03 Vereinigte Verpackungsgesellschaft Mbh, 4019 Monheim Bedruckbarer Sperrschichtkarton
DE3417487A1 (de) * 1984-05-11 1985-11-21 J.M. Voith Gmbh, 7920 Heidenheim Vorrichtung zum auftragen einer fluessigkeit auf eine laufende bahn
DE3502038A1 (de) 1985-01-23 1986-07-24 Sandoz-Patent-GmbH, 7850 Lörrach Waessrige aufhellerpraeparate und deren verwendung im papierstrich
SE456168C (sv) * 1987-02-27 1991-08-12 Mo Och Domsjoe Ab Foerfarande foer ljushetsstabilisering av blekt lignininnehaallande cellulosamassa
ES2029345T3 (es) 1987-08-26 1992-08-01 Ciba-Geigy Ag Blanqueadores opticos de dispersion.
FR2622479B1 (fr) * 1987-11-04 1990-07-13 Tenstar Aquitaine Sa Procede et dispositif de pulverisation continue d'adjuvants sur des produits permeables en bande lors de leur defilement
SE461596B (sv) * 1988-08-05 1990-03-05 Lumalampan Ab Foerfarande foer tillverkning av ljusstabilt papper samt papper erhaallet genom foerfarandet
NO903004L (no) * 1989-07-21 1991-01-22 Bayer Ag Fremgangsmaate for hvittoning av papirbestrykningsmasser samt hvittoningspreparater for fremgangsmaaten.
DE4230656A1 (de) 1992-09-14 1994-03-17 Ciba Geigy Verfahren zur Verbesserung von Weissgrad, Helligkeit und Farbort von Füllstoffen und Pigmenten
GB2277749B (en) * 1993-05-08 1996-12-04 Ciba Geigy Ag Fluorescent whitening of paper
GB9422280D0 (en) * 1994-11-04 1994-12-21 Ciba Geigy Ag Fluorescent whitening agent formulation
US6001463A (en) * 1996-12-26 1999-12-14 Fuji Photo Film Co., Ltd. Image recording medium and image recording process

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See references of WO0121891A1 *

Also Published As

Publication number Publication date
NO20021423D0 (no) 2002-03-21
DE19945580B4 (de) 2004-03-04
CA2385365A1 (fr) 2001-03-29
US6773549B1 (en) 2004-08-10
DE19945580A1 (de) 2001-04-05
DE19945580C5 (de) 2007-03-15
WO2001021891A1 (fr) 2001-03-29
NO20021423L (no) 2002-03-21

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