EP0624213B1 - Paper suitable for rotogravure printing - Google Patents
Paper suitable for rotogravure printing Download PDFInfo
- Publication number
- EP0624213B1 EP0624213B1 EP93902211A EP93902211A EP0624213B1 EP 0624213 B1 EP0624213 B1 EP 0624213B1 EP 93902211 A EP93902211 A EP 93902211A EP 93902211 A EP93902211 A EP 93902211A EP 0624213 B1 EP0624213 B1 EP 0624213B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- coating
- rotogravure printing
- paper suitable
- pigment
- 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
Links
- 238000007639 printing Methods 0.000 title claims abstract description 22
- 239000000049 pigment Substances 0.000 claims abstract description 48
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 30
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 12
- 239000000057 synthetic resin Substances 0.000 claims abstract description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 36
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 18
- 239000005995 Aluminium silicate Substances 0.000 claims description 12
- 235000012211 aluminium silicate Nutrition 0.000 claims description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 7
- 239000000454 talc Substances 0.000 claims description 7
- 229910052623 talc Inorganic materials 0.000 claims description 7
- 229920002472 Starch Polymers 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 235000012222 talc Nutrition 0.000 claims 2
- 238000007646 gravure printing Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003094 microcapsule Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-IGMARMGPSA-N Calcium-40 Chemical compound [40Ca] OYPRJOBELJOOCE-IGMARMGPSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
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
- D21H19/38—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
- D21H19/36—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
- D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
Definitions
- the present invention relates to a paper capable of gravure printing, comprising at least on one side a line provided for receiving the printing ink, which contains mineral pigment and synthetic resin binders.
- Gravure-capable papers of the type specified above are known and are used, for. B. used as a print medium for illustrated magazines, mail order catalogs, advertising brochures or packaging material. Most of the time, the papers are coated on both sides, in many cases first using a pre-coat and then the top coat intended to hold the printing ink. Since, as is known, the failure of the printed image in a paper printed by the gravure printing process depends to a large extent on the surface of the coated paper, in particular on the smoothness and flatness of the line, papers intended for gravure printing are usually calendered, usually using so-called supercalenders.
- hydro- and oxycelluloses have already been used instead of finely ground cellulose fibers as a vegetable filler for the production of art paper or chrome papers.
- This document does not refer to an improvement in the printability of gravure-capable papers which are provided with a line containing mineral pigments and synthetic resin binders.
- the object of the present invention is to provide paper capable of gravure printing, in which the printability is improved and in particular in which the number of "missing dots" that occur is significantly reduced.
- the invention provides an intaglio paper that is at least on one Page has a line intended for receiving the printing ink, which contains mineral pigment and synthetic resin binder, the additional pigment being 5 to 30% by weight of finely ground cellulose fibers based on the total pigment content and 3.5 to 10% by weight of a synthetic resin binder based on the total pigment content contains.
- 10 to 50% by weight of the synthetic resin binder can be replaced by starch as the binder.
- the stroke is preferably applied with a doctor knife.
- both the mineral pigment components and the cellulose fibers are added to the total pigment component.
- the average fiber length of the cellulose fibers is between 10 and 30 »m.
- the production of cellulose fibers ⁇ 10 »m is relatively uneconomical due to the grinding effort, whereas a fiber length> 30» m leads to problems when applying the coating, in particular by means of a doctor blade, due to the accumulation of the longer fibers in the coating machine application.
- the average fiber diameter is preferably in the range from 10 to 20 ⁇ m.
- the term “line” defines the line that receives the printing ink, often also called the top line.
- the paper can have a so-called primer, to which the stroke (top coat) is then applied.
- the information on the binder content is to be understood as an indication of the dry weight proportions.
- cellulose fibers present in the coating is below 5% by weight, there is no appreciable improvement in printability. Amounts of up to 30% by weight of cellulose fibers have proven to be particularly advantageous, particularly in the production of matt paper. In contrast, a proportion of cellulose fibers in the range from 5 to 15% by weight has been found to be particularly suitable for normally glossy papers.
- the mineral pigment used is calcium carbonate in an amount of 70 to 85% by weight, to which 15 to 30% by weight of finely ground cellulose fibers are added, whereby complete all information to 100% by weight total pigment.
- synthetic resin binders e.g. B. aqueous plastic dispersions z. B. based on acrylate or butadiene-styrene, for use.
- Calcium carbonate in which between 50 and 70% by weight of calcium carbonate particles are ⁇ 2 »m, has proven to be a particularly suitable mineral pigment in the production of so-called matt papers in combination with finely ground cellulose fibers.
- a line composition in which the mineral pigment consists of kaolin has proven to be suitable for a normally glossy, gravure-printable paper, having a gloss value of 40 to 55% measured according to Lehmann at 75 o makes up the entire pigment content of the coating, while the remaining 5 to 15% by weight of the pigment fraction consist of 5 to 15% by weight of finely ground cellulose fibers.
- a composition of 10 to 90% by weight calcium carbonate and 90 to 10% by weight kaolin has been found according to a further well-suited embodiment of the invention mineral pigment content 85 to 95 % By weight of the total pigment content and 5 to 15% by weight of finely ground cellulose fibers are added to the mixture of calcium carbonate and kaolin.
- the pigment content of the coating for a gravure-capable paper having a normal gloss consists of a mixture of calcium carbonate and / or kaolin and talc, these mineral pigments accounting for 85 to 95% by weight of the total pigment content of the coating and the rest 5 to 15% by weight of the pigment fraction consist of 5 to 15% by weight of finely ground cellulose fibers.
- the pigment content of a gravure-capable paper having a normal gloss is composed of 85 to 95% by weight of a mixture of: 40 to 70 wt.% Calcium carbonate and / or kaolin and 30 to 60% by weight talc together, with the rest 5 to 15% by weight of the pigment fraction from finely ground cellulose fibers consist.
- An advantage of the above formulation is that the use of calcium carbonate in coating formulations for gravure-sensitive papers is improved, which results in a higher whiteness sets.
- the gravure-printable papers according to the present invention include the so-called LWC (light-weight-coated) papers with a basis weight (including the line on the front and back) of less than 60 g / m 2, with an application weight of 8 to 12 d / m2 is eliminated.
- LWC light-weight-coated
- a primer can preferably be applied, the pigment content of which consists only of calcium carbonate and which is then covered by a top coat according to the invention of 8 to 12 g / m2 on one or both sides.
- cellulose fibers as a coating component have already been used in the production of so-called pressure-sensitive recording papers to protect the microcapsules containing dye precursors used in these papers in order to protect the microcapsules from premature destruction, but it is due to that Hand that the so-called pressure-sensitive recording papers are not capable of gravure printing, because the sensitive microcapsules would be destroyed during the printing process.
- the present invention therefore expressly excludes pressure-sensitive recording papers.
- a coating slip is produced in which the pigment content is made from 58% by weight calcium carbonate, 37% by weight talc and 5% by weight of finely ground cellulose fibers consists.
- the cellulose fibers have an average fiber length of 20 »m and an average fiber thickness of 15» m.
- 5% by weight (dry weight fractions, based on the total pigment fraction) of a self-thickening, aqueous synthetic resin dispersion are used as binders.
- the coating slip is applied with an application weight of 10 g / m2 and side onto a base paper with a basis weight of 37 g / m2 by means of a doctor knife and, after drying, is subjected to a supercalender satin coating in the usual way.
- a further coating slip is produced in accordance with Example 1, but the pigment content increases 60% by weight of calcium carbonate and 40% by weight of talc consists.
- the coated paper is applied and produced in accordance with Example 1.
- a coating slip is produced in which the pigment content 75% by weight calcium carbonate and 25% by weight of finely ground cellulose fibers, as indicated in Example 1. 5% by weight of a synthetic resin binder are used as binders.
- the coating slip also contains auxiliaries for controlling the water retention capacity in the usual dosage.
- a base paper of 49 g / m2 which is already provided with a primer, in which the pigment consists of calcium carbonate, in an amount of 8 g / m2 and side
- the coating slip in an amount of 12 g / m2 and side applied with a squeegee and dried. Then satinizing is carried out in the usual way on a supercalender.
- a coating slip is produced in which the pigment fraction consists of 90% by weight of kaolin and 10% by weight of finely ground cellulose fibers, as stated for example 1.
- the amount and type of binder, application weights and production of the paper correspond to the information given in Example 1.
- Example 3 The procedure is as described above for Example 3, but the pigment fraction consists of 100% by weight of kaolin.
- the table below shows the values for gloss, smoothness, heliotest and sliding friction coefficient measured on the papers produced.
- An intaglio printing plate filled with printing ink, the grid area of which has an increasing cell depth, is rolled off with a constant pressure on a test strip.
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Sheet Holders (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein tiefdruckfähiges Papier, aufweisend zumindest auf einer Seite einen zur Aufnahme der Druckfarbe vorgesehenen Strich, der mineralisches Pigment und Kunstharzbindemittel enthält.The present invention relates to a paper capable of gravure printing, comprising at least on one side a line provided for receiving the printing ink, which contains mineral pigment and synthetic resin binders.
Tiefdruckfähige Papiere der vorstehend angegebenen Art sind bekannt und werden z. B. als Druckträger für illustrierte Zeitschriften, Versandhauskataloge, Werbebroschüren oder Verpackungsmaterial eingesetzt. Meist sind die Papiere beidseitig gestrichen, wobei vielfach zunächst ein Vorstrich und dann der zur Aufnahme der Druckfarbe vorgesehene Deckstrich aufgebracht werden. Da bekannterweise der Ausfall des Druckbildes bei einem nach dem Tiefdruckverfahren bedruckten Papier in erheblicher Weise von der Oberfläche des gestrichenen Papieres, insbesondere von der Glätte und Ebenheit des Striches abhängt, werden für den Tiefdruck vorgesehene Papiere üblicherweise kalandriert, zumeist unter Einsatz von sogenannten Superkalandern. Trotz sorgfältigster Auswahl der zum Einsatz kommenden Rohstoffkomponenten, insbesondere der Streichereipigmente und -bindemittel können vielfach die hohen Anforderungen, die bei Tiefdruckpapieren an den Druckausfall gestellt werden, nicht immer erfüllt werden. Insbesondere besteht das Problem, die Anzahl der auftretenden sogenannten "missing-dots" weiter zu verringern. Unter "missing-dots" werden unbedruckte Fehlstellen verstanden, die infolge geringfügiger Unebenheiten der Papieroberfläche dadurch entstehen, daß die zu bedruckende Bahn nicht genau an der Tiefdruckform anliegt, so daß die in den Näpfchen der Tiefdruckform sich befindende Druckfarbe nicht aus den Näpfchen herausgesaugt wird und sich infolge des Fehlens von Druckfarbe weiße Stellen im Druckbild bilden.Gravure-capable papers of the type specified above are known and are used, for. B. used as a print medium for illustrated magazines, mail order catalogs, advertising brochures or packaging material. Most of the time, the papers are coated on both sides, in many cases first using a pre-coat and then the top coat intended to hold the printing ink. Since, as is known, the failure of the printed image in a paper printed by the gravure printing process depends to a large extent on the surface of the coated paper, in particular on the smoothness and flatness of the line, papers intended for gravure printing are usually calendered, usually using so-called supercalenders. Despite the most careful selection of the raw material components used, in particular of the coating pigments and binders can often not always meet the high requirements placed on rotogravure printing paper. In particular, there is the problem of further reducing the number of so-called "missing dots" that occur. "Missing dots" are understood to mean unprinted imperfections which arise as a result of slight unevenness in the paper surface in that the web to be printed does not lie exactly against the gravure printing form, so that the printing ink located in the cups of the gravure form is not sucked out of the cups and White spots form in the print image due to the lack of printing ink.
Gemäß einem sehr alten Vorschlag nach der DE-C-744 662 wurden bereits Hydro- und Oxycellulosen anstelle von feingemahlenen Cellulosefasern als vegetabilischer Füllstoff für die Herstellung von Kunstdruck- oder Chrompapieren verwendet. Ein Hinweis auf die Verbesserung der Bedruckbarkeit von tiefdruckfähigen Papieren, die mit einem mineralische Pigmente und Kunstharzbindemittel enthaltenden Strich versehen sind, ist dieser Schrift nicht zu entnehmen.According to a very old proposal according to DE-C-744 662, hydro- and oxycelluloses have already been used instead of finely ground cellulose fibers as a vegetable filler for the production of art paper or chrome papers. This document does not refer to an improvement in the printability of gravure-capable papers which are provided with a line containing mineral pigments and synthetic resin binders.
Die vorliegende Erfindung hat die Aufgabe, ein tiefdruckfähiges Papier zur Verfügung zu stellen, bei dem die Bedruckbarkeit verbessert ist und bei dem insbesondere die Anzahl der auftretenden "missing-dots" deutlich verringert ist.The object of the present invention is to provide paper capable of gravure printing, in which the printability is improved and in particular in which the number of "missing dots" that occur is significantly reduced.
Zur Lösung dieser Aufgabe sieht die Erfindung ein tiefdruckfähiges Papier vor, das zumindest auf einer Seite einen zur Aufnahme der Druckfarbe vorgesehenen Strich hat, der mineralisches Pigment und Kunstharzbindemittel enthält, wobei der Strich als weiteres Pigment 5 bis 30 Gew.% feingemahlene Cellulosefasern bezogen auf den Gesamtpigmentanteil und 3,5 bis 10 Gew.% eines Kunstharzbindemittels bezogen auf den Gesamtpigmentgehalt enthält.To achieve this object, the invention provides an intaglio paper that is at least on one Page has a line intended for receiving the printing ink, which contains mineral pigment and synthetic resin binder, the additional pigment being 5 to 30% by weight of finely ground cellulose fibers based on the total pigment content and 3.5 to 10% by weight of a synthetic resin binder based on the total pigment content contains.
Das Kunstharzbindemittel kann zu 10 bis 50 Gew.% durch Stärke als Bindemittel ausgetauscht sein. Der Auftrag des Striches erfolgt vorzugsweise mit einem Streichmesser.10 to 50% by weight of the synthetic resin binder can be replaced by starch as the binder. The stroke is preferably applied with a doctor knife.
Vergleichende Untersuchungen mit den nachfolgend noch näher beschriebenen sogenannten Heliotest zeigten für ein erfindungsgemäßes Papier, bei dem die Pigmentzusammensetzung aus Kreide und Talkum unter Zusatz von 5 Gew.% gemahlenen Cellulosefasern bestand einen Wert von 5 bzw. 13 (Vor-/Rückseite) auf einer Prüflingslänge von 110 mm, während eine Standard-Tiefdruckqualität ohne Zusatz von gemahlenen Cellulosefasern 20 "missing-dots" auf 72/83 mm Länge (Vor-/Rückseite) zeigte.Comparative studies with the so-called heliotest described in more detail below showed a value of 5 or 13 (front / back) on a test specimen length for a paper according to the invention in which the pigment composition of chalk and talc with the addition of 5% by weight of ground cellulose fibers of 110 mm, while a standard gravure quality without the addition of ground cellulose fibers showed 20 "missing dots" on 72/83 mm length (front / back).
Im Rahmen der vorliegenden Erfindung werden dem Gesamtpigmentanteil dabei sowohl die mineralischen Pigmentanteile als auch die Cellulosefasern zugerechnet.In the context of the present invention, both the mineral pigment components and the cellulose fibers are added to the total pigment component.
Gemäß einer vorzugsweisen Ausführungsform der Erfindung liegt die durchschnittliche Faserlänge der Cellulosefasern zwischen 10 und 30 »m. Die Herstellung von Cellulosefasern < 10 »m ist infolge des Mahlaufwandes relativ unwirtschaftlich, wohingegen eine Faserlänge > 30 »m zu Problemen beim Strichauftrag, insbesondere mittels eines Rakels führt und zwar infolge von Anreicherung der längeren Fasern im Auftragswerk der Streichmaschine.According to a preferred embodiment of the invention, the average fiber length of the cellulose fibers is between 10 and 30 »m. The production of cellulose fibers <10 »m is relatively uneconomical due to the grinding effort, whereas a fiber length> 30» m leads to problems when applying the coating, in particular by means of a doctor blade, due to the accumulation of the longer fibers in the coating machine application.
Vorzugsweise liegt der durchschnittliche Faserdurchmesser im Bereich von 10 bis 20 »m.The average fiber diameter is preferably in the range from 10 to 20 μm.
Der Begriff "Strich" definiert entsprechend der Erfindung den die Druckfarbe aufnehmenden Strich, vielfach auch Deckstrich genannt. Ohne den Rahmen der Erfindung zu verlassen, kann das Papier einen sogenannten Vorstrich aufweisen, auf den dann der Strich (Deckstrich) aufgetragen wird. Die Angaben zum Bindemittelgehalt sind als Angabe der Trockengewichtsanteile zu verstehen.According to the invention, the term “line” defines the line that receives the printing ink, often also called the top line. Without leaving the scope of the invention, the paper can have a so-called primer, to which the stroke (top coat) is then applied. The information on the binder content is to be understood as an indication of the dry weight proportions.
Sofern der Anteil der im Strich vorliegenden Cellulosefasern unterhalb von 5 Gew.% liegt, tritt keine nennenswerte Verbesserung der Bedruckbarkeit ein. Einsatzmengen bis zu 30 Gew.% Cellulosefasern haben sich insbesondere bei der Herstellung von Mattpapier als besonders vorteilhaft erwiesen. Für normal glänzende Papiere hat sich dagegen ein Anteil von Cellulosefasern im Bereich von 5 bis 15 Gew.% als besonders geeignet gezeigt.If the proportion of cellulose fibers present in the coating is below 5% by weight, there is no appreciable improvement in printability. Amounts of up to 30% by weight of cellulose fibers have proven to be particularly advantageous, particularly in the production of matt paper. In contrast, a proportion of cellulose fibers in the range from 5 to 15% by weight has been found to be particularly suitable for normally glossy papers.
Gemäß einer besonders bevorzugten Rezeptur für ein einen nichtglänzenden Strich aufweisendes, nachfolgend Mattpapier genanntes, tiefdruckfähiges Papier kommt als mineralisches Pigment Calciumcarbonat mit einer Menge von 70 bis 85 Gew.% zum Einsatz, dem 15 bis 30 Gew.% feingemahlener Cellulosefasern zugesetzt sind, wobei sich alle Angaben auf 100 Gew.% Gesamtpigment ergänzen.According to a particularly preferred recipe for a non-glossy coating, hereinafter called matt paper, which is suitable for gravure printing, the mineral pigment used is calcium carbonate in an amount of 70 to 85% by weight, to which 15 to 30% by weight of finely ground cellulose fibers are added, whereby complete all information to 100% by weight total pigment.
Als Kunstharzbindemittel kommen, z. B. wäßrige Kunststoffdispersionen z. B. auf Acrylatbasis oder Butadien-Styrolbasis, zum Einsatz.Coming as synthetic resin binders, e.g. B. aqueous plastic dispersions z. B. based on acrylate or butadiene-styrene, for use.
Als besonders geeignetes mineralisches Pigment hat sich bei der Herstellung sog. Mattpapiere in Kombination mit feingemahlenen Cellulosefasern ein Calciumcarbonat erwiesen, bei dem zwischen 50 und 70 Gew.% Calciumcarbonatteilchen < 2 »m sind.Calcium carbonate, in which between 50 and 70% by weight of calcium carbonate particles are <2 »m, has proven to be a particularly suitable mineral pigment in the production of so-called matt papers in combination with finely ground cellulose fibers.
Für ein normal glänzendes tiefdruckfähiges Papier, aufweisend einen nach Lehmann bei 75 o gemessenen Glanzwert von 40 bis 55 %, hat sich eine Strichzusammensetzung als geeignet erwiesen, bei der das mineralische Pigment aus Kaolin besteht, wobei dieser mineralische Pigmentanteil 85 bis 95 Gew.% des gesamten Pigmentgehaltes des Striches ausmacht, während die restlichen 5 bis 15 Gew.% des Pigmentanteiles aus 5 bis 15 Gew.% feingemahlenen Cellulosefasern bestehen.A line composition in which the mineral pigment consists of kaolin has proven to be suitable for a normally glossy, gravure-printable paper, having a gloss value of 40 to 55% measured according to Lehmann at 75 o makes up the entire pigment content of the coating, while the remaining 5 to 15% by weight of the pigment fraction consist of 5 to 15% by weight of finely ground cellulose fibers.
Für ein tiefdruckfähiges, normal glänzendes Papier mit einer aus Calciumcarbonat und Kaolin bestehenden Mischung der mineralischen Pigmente hat sich gemäß einer weiteren gut geeigneten Ausführungsform der Erfindung eine Zusammensetzung aus 10 bis 90 Gew.% Calciumcarbonat und 90 bis 10 Gew.% Kaolin erwiesen, wobei dieser mineralische Pigmentanteil 85 bis 95 Gew.% des gesamten Pigmentanteils beträgt und der Mischung aus Calciumcarbonat und Kaolin 5 bis 15 Gew.% feingemahlene Cellulosefasern zugesetzt sind.For a gravure-printable, normally glossy paper with a mixture of the mineral pigments consisting of calcium carbonate and kaolin, a composition of 10 to 90% by weight calcium carbonate and 90 to 10% by weight kaolin has been found according to a further well-suited embodiment of the invention mineral pigment content 85 to 95 % By weight of the total pigment content and 5 to 15% by weight of finely ground cellulose fibers are added to the mixture of calcium carbonate and kaolin.
Gemäß einer besonders bevorzugten Ausführungsform der Erfindung besteht der Pigmentgehalt des Striches für ein einen Normalglanz aufweisendes tiefdruckfähiges Papier aus einer Mischung von Calciumcarbonat und/oder Kaolin und Talkum, wobei diese mineralischen Pigmente 85 bis 95 Gew.% des gesamten Pigmentgehaltes des Striches ausmachen und die restlichen 5 bis 15 Gew.% des Pigmentanteiles aus 5 bis 15 Gew.% feingemahlenen Cellulosefasern bestehen.According to a particularly preferred embodiment of the invention, the pigment content of the coating for a gravure-capable paper having a normal gloss consists of a mixture of calcium carbonate and / or kaolin and talc, these mineral pigments accounting for 85 to 95% by weight of the total pigment content of the coating and the rest 5 to 15% by weight of the pigment fraction consist of 5 to 15% by weight of finely ground cellulose fibers.
Gemäß einer weiteren ganz besonders bevorzugten Ausführungsform setzt sich der Pigmentgehalt eines einen Normalglanz aufweisenden tiefdruckfähigen Papiers zu 85 bis 95 Gew.% aus einer Mischung aus:
40 bis 70 Gew.% Calciumcarbonat und/oder Kaolin und
30 bis 60 Gew.% Talkum
zusammen, wobei die restlichen
5 bis 15 Gew.% des Pigmentanteiles aus feingemahlenen Cellulosefasern
bestehen.According to a further very particularly preferred embodiment, the pigment content of a gravure-capable paper having a normal gloss is composed of 85 to 95% by weight of a mixture of:
40 to 70 wt.% Calcium carbonate and / or kaolin and
30 to 60% by weight talc
together, with the rest
5 to 15% by weight of the pigment fraction from finely ground cellulose fibers
consist.
Ein Vorteil der vorstehenden Rezeptur besteht darin, daß die Einsatzmöglichkeit von Calciumcarbonat in Streichrezepturen für tiefdruckfähige Papiere verbessert wird, wodurch sich eine höhere Weiße einstellt.An advantage of the above formulation is that the use of calcium carbonate in coating formulations for gravure-sensitive papers is improved, which results in a higher whiteness sets.
Zu den tiefdruckfähigen Papieren gemäß der vorliegenden Erfindung gehören die sogenannten LWC (light-weight-coated) -Papiere mit einer Flächenmasse (einschl. Strich auf Vor- und Rückseite) unterhalb von 60 g/m², wobei auf jeden Strich ein Auftragsgewicht von 8 bis 12 d/m² entfällt.The gravure-printable papers according to the present invention include the so-called LWC (light-weight-coated) papers with a basis weight (including the line on the front and back) of less than 60 g / m 2, with an application weight of 8 to 12 d / m² is eliminated.
Bei Tiefdruckpapieren einer Flächenmasse > 80 g/m² kann vorzugsweise ein Vorstrich aufgebracht werden, dessen Pigmentanteil lediglich aus Calciumcarbonat besteht und der dann wiederum durch einen Deckstrich entsprechend der Erfindung von 8 bis 12 g/m² auf einer oder beiden Seiten abgedeckt wird.In the case of rotogravure papers with a mass of> 80 g / m², a primer can preferably be applied, the pigment content of which consists only of calcium carbonate and which is then covered by a top coat according to the invention of 8 to 12 g / m² on one or both sides.
Zur Klarstellung der vorliegenden Erfindung sei darauf hingewiesen, daß Cellulosefasern als Streichmassenkomponente zwar bereits bei der Herstellung von sogenannten druckempfindlichen Aufzeichnungspapieren zum Schutz der in diesen Papieren verwendeten Farbstoffvorläufer enthaltenden Mikrokapseln eingesetzt wurden, um die Mikrokapseln vor einer vorzeitigen Zerstörung zu schützen, es liegt jedoch auf der Hand, daß die sogenannten druckempfindlichen Aufzeichnungspapiere nicht tiefdruckfähig sind, weil beim Druckvorgang die empfindlichen Mikrokapseln zerstört würden. Die vorliegende Erfindung schließt daher druckempfindliche Aufzeichnungspapiere ausdrücklich aus.To clarify the present invention, it should be pointed out that cellulose fibers as a coating component have already been used in the production of so-called pressure-sensitive recording papers to protect the microcapsules containing dye precursors used in these papers in order to protect the microcapsules from premature destruction, but it is due to that Hand that the so-called pressure-sensitive recording papers are not capable of gravure printing, because the sensitive microcapsules would be destroyed during the printing process. The The present invention therefore expressly excludes pressure-sensitive recording papers.
Die nachfolgenden Beispiele erläutern die Erfindung.The following examples illustrate the invention.
Es wird eine Streichmasse hergestellt, bei der der Pigmentanteil aus
58 Gew.% Calciumcarbonat,
37 Gew.% Talkum und
5 Gew.% feingemahlenen Cellulosefasern
besteht. Die Cellulosefasern haben eine durchschnittliche Faserlänge von 20 »m und eine durchschnittliche Faserdicke von 15 »m. Als Bindemittel kommen 5 Gew.% (Trockengewichtsanteile, bezogen auf Gesamtpigmentanteil) einer selbstverdickenden, wäßrigen Kunstharzdispersion zum Einsatz. Die Streichmasse wird mit einem Auftragsgewicht von 10 g/m² und Seite auf ein Rohpapier mit einer Flächenmasse von 37 g/m² mittels eines Rakels aufgetragen und nach Trocknung in üblicher Weise einer Superkalandersatinage unterworfen.A coating slip is produced in which the pigment content is made from
58% by weight calcium carbonate,
37% by weight talc and
5% by weight of finely ground cellulose fibers
consists. The cellulose fibers have an average fiber length of 20 »m and an average fiber thickness of 15» m. 5% by weight (dry weight fractions, based on the total pigment fraction) of a self-thickening, aqueous synthetic resin dispersion are used as binders. The coating slip is applied with an application weight of 10 g / m² and side onto a base paper with a basis weight of 37 g / m² by means of a doctor knife and, after drying, is subjected to a supercalender satin coating in the usual way.
Es wird eine weitere Streichmasse entsprechend Beispiel 1 hergestellt, wobei jedoch der Pigmentanteil zu
60 Gew.% aus Calciumcarbonat und zu
40 Gew.% aus Talkum
besteht. Der Auftrag und die Herstellung des gestrichenen Papiers erfolgt entsprechend Beispiel 1.A further coating slip is produced in accordance with Example 1, but the pigment content increases
60% by weight of calcium carbonate and
40% by weight of talc
consists. The coated paper is applied and produced in accordance with Example 1.
Zur Herstellung eines Mattpapiers wird eine Streichmasse hergestellt, bei der der Pigmentanteil aus
75 Gew.% Calciumcarbonat und
25 Gew.% feingemahlenen Cellulosefasern,
wie zu Beispiel 1 angegeben, besteht. Als Bindemittel kommen 5 Gew.% eines Kunstharzbindemittels zum Einsatz. Außerdem enthält die Streichmasse noch Hilfsstoffe zur Steuerung des Wasserrückhaltevermögens in der üblichen Dosierung. Auf ein Rohpapier von 49 g/m², das bereits mit einem Vorstrich, bei dem das Pigment aus Calciumcarbonat besteht, in einer Menge von 8 g/m² und Seite versehen ist, wird die Streichmasse in einer Menge von 12 g/m² und Seite mittels eines Rakels aufgetragen und getrocknet. Anschließend wird in üblicher Weise eine Satinage auf einem Superkalander durchgeführt.To produce matt paper, a coating slip is produced in which the pigment content
75% by weight calcium carbonate and
25% by weight of finely ground cellulose fibers,
as indicated in Example 1. 5% by weight of a synthetic resin binder are used as binders. The coating slip also contains auxiliaries for controlling the water retention capacity in the usual dosage. On a base paper of 49 g / m², which is already provided with a primer, in which the pigment consists of calcium carbonate, in an amount of 8 g / m² and side, the coating slip in an amount of 12 g / m² and side applied with a squeegee and dried. Then satinizing is carried out in the usual way on a supercalender.
Es wird eine Streichmasse hergestellt, bei der der Pigmentanteil aus 90 Gew.% Kaolin und 10 Gew.% feingemahlenen Cellulosefasern, wie zu Beispiel 1 angegeben, besteht. Bindemittelmenge und Art, Auftragsgewichte und Herstellung des Papiers entsprechen den Angaben zu Beispiel 1.A coating slip is produced in which the pigment fraction consists of 90% by weight of kaolin and 10% by weight of finely ground cellulose fibers, as stated for example 1. The amount and type of binder, application weights and production of the paper correspond to the information given in Example 1.
Es wird wie vorstehend zu Beispiel 3 beschrieben gearbeitet, jedoch besteht der pigmentanteil zu 100 Gew.% aus Kaolin.The procedure is as described above for Example 3, but the pigment fraction consists of 100% by weight of kaolin.
Die nachfolgende Tabelle zeigt die an den hergestellten Papieren gemessenen Werte für Glanz, Glätte, Heliotest und Gleitreibungskoeffizient.
Eine Tiefdruckform, gefüllt mit Druckfarbe, deren Rasterfläche eine zunehmende Näpfchentiefe aufweist, wird mit konstantem Andruck über einen Probestreifen abgerollt. Die Strecke auf dem Probestreifen bis zum Erreichen von 20 "missing-dots", beginnend beim dunkleren Ende (tiefe Näpfchen) des Probestreifens, wird in mm angegeben. Werden auf der Gesamtlänge des Streifens von 110 mm keine 20 "missing-dots" erreicht, so wird die Anzahl "missing-dots" auf 110 mm angegeben.An intaglio printing plate, filled with printing ink, the grid area of which has an increasing cell depth, is rolled off with a constant pressure on a test strip. The distance on the test strip until 20 "missing dots" are reached, starting at the darker end (deep well) of the test strip, is given in mm. If 20 "missing dots" are not reached over the total length of the strip of 110 mm, the number of "missing dots" is given as 110 mm.
Claims (9)
- Paper suitable for rotogravure printing, having at least on one side a coating provided to receive the printing ink and containing mineral pigment and synthetic resin binder, characterised in that the coating contains as further pigment from 5 to 30% by weight of finely-ground cellulose fibres, based on the total pigment portion, and from 3.5 to 10% by weight of a synthetic resin binder, based on the total pigment content.
- Paper suitable for rotogravure printing according to claim 1, characterised in that from 10 to 50% by weight of the synthetic resin binder is replaced by starch as binder.
- Paper suitable for rotogravure printing according to either of claims 1 and 2, characterised in that the average fibre length of the cellulose fibres is from 10 to 30 »m.
- Paper suitable for rotogravure printing according to one of claims 1 to 3, characterised in that the average diameter of the cellulose fibres is from 10 to 20 »m.
- Paper suitable for rotogravure printing according to one of claims 1 to 4, characterised in that the mineral pigment consists of calcium carbonate and is present in the coating in an amount of from 70 to 85% by weight, based on the total pigment content, and from 15 to 30% by weight of the total pigment content consists of finely-ground cellulose fibres.
- Paper suitable for rotogravure printing according to one of Claims 1 to 4, characterised in that the mineral pigment consists of kaolin and is present in the coating in an amount of from 85 to 95% by weight, based on the total pigment content, and from 5 to 15% by weight of the total pigment content consists of finely-ground cellulose fibres.
- Paper suitable for rotogravure printing according to one of Claims 1 to 4, characterised in that the pigment content of the coating consists of 85 to 95% by weight of calcium carbonate and/or kaolin and talcum and 5 to 15% by weight of finely-ground cellulose fibres.
- Paper suitable for rotogravure printing according to one of Claims 1 to 4 and 7, characterised in that the pigment content of the coating a) consists, to 85 to 95% by weight, of a mixture of:- 40 to 70% by weight of calcium carbonate and/or kaolin- 30 to 60% by weight of talcumand b) consists, to 5 to 15% by weight, of finely-ground cellulose fibres.
- Paper suitable for rotogravure printing according to one of Claims 1 to 4, characterised in that the mineral pigment portion consists of from 10 to 90% by weight of calcium carbonate and from 90 to 10% by weight of kaolin, and 5 to 15% by weight of finely-ground cellulose fibres, based on the total pigment content, is present in the coating.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4202598 | 1992-01-30 | ||
| DE4202598A DE4202598C1 (en) | 1992-01-30 | 1992-01-30 | |
| PCT/EP1993/000087 WO1993015270A1 (en) | 1992-01-30 | 1993-01-15 | Paper suitable for rotogravure printing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0624213A1 EP0624213A1 (en) | 1994-11-17 |
| EP0624213B1 true EP0624213B1 (en) | 1995-07-12 |
Family
ID=6450591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93902211A Expired - Lifetime EP0624213B1 (en) | 1992-01-30 | 1993-01-15 | Paper suitable for rotogravure printing |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0624213B1 (en) |
| AT (1) | ATE125015T1 (en) |
| DE (2) | DE4202598C1 (en) |
| DK (1) | DK0624213T3 (en) |
| ES (1) | ES2074926T3 (en) |
| FI (1) | FI114326B (en) |
| WO (1) | WO1993015270A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009080894A1 (en) * | 2007-12-21 | 2009-07-02 | Upm-Kymmene Oyj | Method for making organic pigment |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19527161A1 (en) * | 1995-07-25 | 1997-01-30 | Sued Chemie Ag | Pigment mixture and coating color with improved gravure suitability |
| PL3617400T3 (en) | 2009-03-30 | 2023-01-02 | Fiberlean Technologies Limited | Use of nanofibrillar cellulose suspensions |
| ES2650373T3 (en) | 2009-03-30 | 2018-01-18 | Fiberlean Technologies Limited | Procedure for the production of nanofibrillar cellulose gels |
| GB0908401D0 (en) | 2009-05-15 | 2009-06-24 | Imerys Minerals Ltd | Paper filler composition |
| SI2386682T1 (en) | 2010-04-27 | 2014-07-31 | Omya International Ag | Process for the manufacture of structured materials using nano-fibrillar cellulose gels |
| ES2464733T3 (en) | 2010-04-27 | 2014-06-03 | Omya International Ag | Process for the production of gel-based composite materials |
| GB201019288D0 (en) | 2010-11-15 | 2010-12-29 | Imerys Minerals Ltd | Compositions |
| EP3560991A1 (en) | 2015-10-14 | 2019-10-30 | FiberLean Technologies Limited | 3d-formable sheet material |
| US11846072B2 (en) | 2016-04-05 | 2023-12-19 | Fiberlean Technologies Limited | Process of making paper and paperboard products |
| PT3828339T (en) | 2016-04-05 | 2024-01-02 | Fiberlean Tech Ltd | Paper and paperboard products |
| US10794006B2 (en) | 2016-04-22 | 2020-10-06 | Fiberlean Technologies Limited | Compositions comprising microfibrilated cellulose and polymers and methods of manufacturing fibres and nonwoven materials therefrom |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE744662C (en) * | 1942-04-03 | 1944-01-22 | Feldmuehle Papier Und Zellstof | Process for the production of a binding and smoothing agent suitable for coating slips in art print and chromo paper |
| FR2648488B1 (en) * | 1989-06-15 | 1991-09-13 | Gomez Daniel | POROUS, MICRONIZED, LOW DENSE PLANT LOAD, CONTROLLED SIZE AND LOW SPECIFIC PHYSICAL AND HYDRAULIC SURFACES; PREPARATION AND USE PROCESS |
| NO903004L (en) * | 1989-07-21 | 1991-01-22 | Bayer Ag | PROCEDURE FOR WHITENING OF PAPER COATING MATERIALS AND WHITENING PREPARATIONS FOR THE PROCEDURE. |
| DE3924051A1 (en) * | 1989-07-21 | 1991-01-24 | Bayer Ag | Whitening paper coating compsn. with anionic white toner |
-
1992
- 1992-01-30 DE DE4202598A patent/DE4202598C1/de not_active Expired - Fee Related
-
1993
- 1993-01-15 AT AT93902211T patent/ATE125015T1/en not_active IP Right Cessation
- 1993-01-15 WO PCT/EP1993/000087 patent/WO1993015270A1/en active IP Right Grant
- 1993-01-15 EP EP93902211A patent/EP0624213B1/en not_active Expired - Lifetime
- 1993-01-15 ES ES93902211T patent/ES2074926T3/en not_active Expired - Lifetime
- 1993-01-15 DK DK93902211.7T patent/DK0624213T3/en active
- 1993-01-15 DE DE59300352T patent/DE59300352D1/en not_active Expired - Fee Related
-
1994
- 1994-07-25 FI FI943494A patent/FI114326B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009080894A1 (en) * | 2007-12-21 | 2009-07-02 | Upm-Kymmene Oyj | Method for making organic pigment |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2074926T3 (en) | 1995-09-16 |
| FI943494A (en) | 1994-07-25 |
| ATE125015T1 (en) | 1995-07-15 |
| FI114326B (en) | 2004-09-30 |
| DE59300352D1 (en) | 1995-08-17 |
| WO1993015270A1 (en) | 1993-08-05 |
| EP0624213A1 (en) | 1994-11-17 |
| DK0624213T3 (en) | 1995-08-21 |
| FI943494A0 (en) | 1994-07-25 |
| DE4202598C1 (en) | 1993-09-02 |
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