EP1840265A2 - Method for avoiding printing spots - Google Patents

Method for avoiding printing spots Download PDF

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Publication number
EP1840265A2
EP1840265A2 EP07004109A EP07004109A EP1840265A2 EP 1840265 A2 EP1840265 A2 EP 1840265A2 EP 07004109 A EP07004109 A EP 07004109A EP 07004109 A EP07004109 A EP 07004109A EP 1840265 A2 EP1840265 A2 EP 1840265A2
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EP
European Patent Office
Prior art keywords
printing
elements
paper surface
superimposed
size
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.)
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Application number
EP07004109A
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German (de)
French (fr)
Other versions
EP1840265A3 (en
Inventor
Paul Heinz Dähling
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
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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.)
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Publication date
Application filed by Stora Enso Publication Paper GmbH and Co KG filed Critical Stora Enso Publication Paper GmbH and Co KG
Publication of EP1840265A2 publication Critical patent/EP1840265A2/en
Publication of EP1840265A3 publication Critical patent/EP1840265A3/en
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the invention relates to a method for avoiding printing blotchiness in printing papers used in screen printing processes.
  • Paper has the fundamental disadvantage in its use as a printing material to produce pressure staining due to its inhomogeneous material distribution. Local variations in the composition of the material lead to locally different interactions with printing ink and printing form, which can manifest themselves in different quantities of ink transferred and / or expression of the dots in size and shape. This modulation of the print image through the paper structure has a visible to the human eye dimension, usually in the order of a few millimeters and thus has a disturbing effect.
  • Paper consists essentially of fibers and fillers, with the fibers and their secondary structures reaching the size of millimeters and the size of the filler particles being in the micrometer range. Controls used structure-forming elements in the intermediate area, the size range of the print grid and pressure points are missing. This lack of control of the structures in the 10-100 ⁇ m range results in many printability problems.
  • the problem is to be counteracted by selection and preparation of the materials, the sheet formation technique, the coating and drying technique, the calendering technique. All measures are aimed at achieving a more uniform paper structure, be it to produce a more uniform fiber structure and / or to control migratory processes during brushing and drying. Since almost all areas of the manufacturing process influence the print quality, the measures for improving them are manifold and complex and often come into conflict with other demands on quality and effectiveness.
  • the object of the invention is to provide a simple method for avoiding print staining in printing papers used in screen printing processes, which is downstream of the actual papermaking process.
  • the interaction of the paper with printing ink and printing form in the printing process essentially starts from its surface, apart from compression effects.
  • the properties of the paper surface leading to the modulation of the printed image with the resulting print staining are superimposed by a structure applied before the actual printing process, which influences the microstructure, porosity and wettability. This will modulates one or a combination of the above surface properties. This makes it possible to control the printability independently of the rest of the papermaking process and this opens up opportunities for simplification and cheapening.
  • the superimposed structure consists of elements below the resolution of the human eye and thus causes a frequency shift of the patchiness in an area that is no longer perceptible to the human observer.
  • the elements forming the structure preferably have a size of 10-100 ⁇ m and are stochastically shaped.
  • the production of stochastically shaped elements for example, in the German Offenlegungsschrift DE 103 27 246 A1 or DE 103 27 248 A1 disclosed.
  • the material requirement for the selective treatment of the surface is very low. It can be used materials that are incompatible with paper pulp and line and thus in the manufacturing process itself can not be used. Suitable materials are all customary in the paper coating natural and synthetic binders as well as surface-active materials and / or mineral dispersions and solutions.
  • a screen printing form is provided with a stochastic screen printing pattern, wherein the stochastic screen according to the DE 103 27 246 A1 or DE 103 27 248 A1 revealed doctrine be generated.
  • a strongly hydrophobic, ink-repellent fluorochemical "Lodyne” from Ciba is applied to a printing paper and thus formed the superimposed structure.
  • the printing paper is printed with a 50% halftone gravure grid in black. The mottling measured on the printed surface in the visible critical wavelength range of 1 to 4 mm is reduced by 50% compared to a non-pretreated printing paper.

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  • Printing Methods (AREA)
  • Paper (AREA)

Abstract

The method involves overlaying characteristics of a paper surface guided for modulation of a print image by a superimposed structure applied before a printing procedure, where the structure inflences the microstructure, porosity and the wettability of the paper surface. Elelments of the superimposed structure are formed on the paper surface by the printing procedure, where size of the elements is selected within a range of 10,100 micro meter.

Description

Die Erfindung betrifft ein Verfahren zur Vermeidung von Druckfleckigkeit bei in Rasterdruckverfahren eingesetzten Druckpapieren.The invention relates to a method for avoiding printing blotchiness in printing papers used in screen printing processes.

Papier hat in seiner Verwendung als Bedruckstoff den grundsätzlichen Nachteil, durch seine inhomogene Materialverteilung Druckfleckigkeit zu erzeugen.
Lokale Schwankungen der stofflichen Zusammensetzung führen zu lokal unterschiedlichen Wechselwirkungen mit Druckfarbe und Druckform, die sich in unterschiedlich übertragener Druckfarbenmenge und / oder Ausprägung der Rasterpunkte in Größe und Form äußern können.
Diese Modulation des Druckbildes durch die Papierstruktur hat eine für das menschliche Auge sichtbare Dimension, meist in der Größenordnung einiger Millimeter und wirkt somit störend.Paper has the fundamental disadvantage in its use as a printing material to produce pressure staining due to its inhomogeneous material distribution.
Local variations in the composition of the material lead to locally different interactions with printing ink and printing form, which can manifest themselves in different quantities of ink transferred and / or expression of the dots in size and shape.
This modulation of the print image through the paper structure has a visible to the human eye dimension, usually in the order of a few millimeters and thus has a disturbing effect.

Papier besteht im Wesentlichen aus Fasern und Füllstoffen, wobei die Fasern und ihre Sekundärstrukturen die Größe von Millimetern erreichen und die Größe der Füllstoffpartikel im Mikrometerbereich liegt. Kontrolliert eingesetzte Struktur bildende Elemente im dazwischen liegenden Bereich, dem Größenbereich der Druckraster und Druckpunkte, fehlen. Aus dieser mangelnden Kontrolle der Strukturen im 10 - 100 µm Bereich resultieren viele Bedruckbarkeitsprobleme.Paper consists essentially of fibers and fillers, with the fibers and their secondary structures reaching the size of millimeters and the size of the filler particles being in the micrometer range. Controls used structure-forming elements in the intermediate area, the size range of the print grid and pressure points are missing. This lack of control of the structures in the 10-100 μm range results in many printability problems.

Herkömmlich versucht man dem Problem durch Auswahl und Aufbereitung der Materialien, der Blattbildungstechnik, der Streich- und Trocknungstechnik, der Kalandertechnik entgegenzuwirken. Alle Maßnahmen zielen darauf ab, einen gleichmäßigeren Papieraufbau zu erreichen, sei es eine gleichmäßigere Faserstruktur zu erzeugen und / oder Migrationsvorgänge beim Streichen und Trocknen zu kontrollieren.
Da nahezu alle Bereiche des Herstellungsprozesses Einfluss auf die Druckqualität nehmen, sind die Maßnahmen zu ihrer Verbesserung vielfältig und aufwendig und geraten häufig mit anderen Anforderungen an Qualität und Effektivität in Konflikt.Conventionally, the problem is to be counteracted by selection and preparation of the materials, the sheet formation technique, the coating and drying technique, the calendering technique. All measures are aimed at achieving a more uniform paper structure, be it to produce a more uniform fiber structure and / or to control migratory processes during brushing and drying.
Since almost all areas of the manufacturing process influence the print quality, the measures for improving them are manifold and complex and often come into conflict with other demands on quality and effectiveness.

Aufgabe der Erfindung ist es, ein einfaches Verfahren zur Vermeidung von Druckfleckigkeit bei in Rasterdruckverfahren eingesetzten Druckpapieren zur Verfügung zu stellen, das dem eigentlichen Papierherstellungsprozess nachgelagert ist.The object of the invention is to provide a simple method for avoiding print staining in printing papers used in screen printing processes, which is downstream of the actual papermaking process.

Die Aufgabe wird durch den kennzeichnenden Teil des Patentanspruches 1 und die nachgeordneten Unteransprüche gelöst.The object is solved by the characterizing part of claim 1 and the dependent subclaims.

Die Wechselwirkung des Papiers mit Druckfarbe und Druckform beim Druckprozess geht im Wesentlichen, von Kompressionseffekten abgesehen, von seiner Oberfläche aus. Erfindungsgemäß werden daher die zur Modulation des Druckbildes führenden Eigenschaften der Papieroberfläche mit der daraus resultierenden Druckfleckigkeit durch eine vor dem eigentlichen Druckvorgang aufgebrachte Struktur überlagert, die die Mikrostruktur, Porosität und Benetzbarkeit beeinflusst. Dadurch wird eine oder eine Kombination der oben genannten Oberflächeneigenschaften moduliert.
Damit wird es ermöglicht, die Bedruckbarkeit unabhängig vom übrigen Papierherstellungsprozess zu steuern und diesem werden damit Möglichkeiten zur Vereinfachung und Verbilligung eröffnet. Die überlagerte Struktur besteht aus Elementen unterhalb des Auflösungsvermögens des menschlichen Auges und bewirkt somit eine Frequenzverschiebung der Fleckigkeit in einen Bereich, der für den menschlichen Betrachter nicht mehr wahrnehmbar ist. Bevorzugt weisen die die Struktur bildenden Elemente eine Größe von 10 - 100 µm auf und sind stochastisch geformt. Die Erzeugung stochastisch geformter Elemente wird beispielsweise in der deutschen Offenlegungsschrift DE 103 27 246 A1 oder DE 103 27 248 A1 offenbart.The interaction of the paper with printing ink and printing form in the printing process essentially starts from its surface, apart from compression effects. According to the invention, therefore, the properties of the paper surface leading to the modulation of the printed image with the resulting print staining are superimposed by a structure applied before the actual printing process, which influences the microstructure, porosity and wettability. This will modulates one or a combination of the above surface properties.
This makes it possible to control the printability independently of the rest of the papermaking process and this opens up opportunities for simplification and cheapening. The superimposed structure consists of elements below the resolution of the human eye and thus causes a frequency shift of the patchiness in an area that is no longer perceptible to the human observer. The elements forming the structure preferably have a size of 10-100 μm and are stochastically shaped. The production of stochastically shaped elements, for example, in the German Offenlegungsschrift DE 103 27 246 A1 or DE 103 27 248 A1 disclosed.

Zur Erzeugung der überlagernden Oberflächenstrukturen werden Techniken in Anlehnung an Druckverfahren wie z.B. Gravur-, Siebdruck oder Flexodruck verwendet, die vorzugsweise in den Kalanderprozess nach dem eigentlichen Glättvorgang integriert werden können.In order to produce the superimposed surface structures, techniques based on printing processes such as e.g. Engraving, screen printing or flexographic printing used, which can be preferably integrated into the calendering process after the actual smoothing process.

Der Materialbedarf zur selektiven Behandlung der Oberfläche ist sehr gering. Es können Materialien verwendet werden, die mit Papiermasse und Strich nicht verträglich und somit im Herstellungsprozess selbst nicht einsetzbar sind. Als Materialien kommen alle in der Papierbeschichtung üblichen natürlichen und synthetischen Bindemittel in Betracht sowie oberflächenaktive Materialien und/oder mineralische Dispersionen und Lösungen.The material requirement for the selective treatment of the surface is very low. It can be used materials that are incompatible with paper pulp and line and thus in the manufacturing process itself can not be used. Suitable materials are all customary in the paper coating natural and synthetic binders as well as surface-active materials and / or mineral dispersions and solutions.

Die Erfindung wird an dem nachfolgenden Beispiel näher erläutert.The invention will be explained in more detail in the following example.

Eine Siebdruckform wird mit einem stochastischen Rasterdruckmuster versehen, wobei das stochastische Raster gemäß der in der DE 103 27 246 A1 oder DE 103 27 248 A1 offenbarten Lehre erzeugt werden. Mittels dieser Siebdruckform wird eine stark hydrophobe, Druckfarben abstoßende Fluorochemikalie "Lodyne" der Firma Ciba auf ein Druckpapier aufgebracht und somit die überlagerte Struktur gebildet. Daran anschließend wird das Druckpapier mit einem 50 % Halbton-Tiefdruckraster in schwarz bedruckt. Das an der bedruckten Fläche im sichtbaren kritischen Wellenlängenbereich von 1 - 4 mm gemessenen Mottling wird im Vergleich zu einem nicht vorbehandeltem Druckpapier um 50 % reduziert.A screen printing form is provided with a stochastic screen printing pattern, wherein the stochastic screen according to the DE 103 27 246 A1 or DE 103 27 248 A1 revealed doctrine be generated. By means of this screen printing form, a strongly hydrophobic, ink-repellent fluorochemical "Lodyne" from Ciba is applied to a printing paper and thus formed the superimposed structure. Subsequently, the printing paper is printed with a 50% halftone gravure grid in black. The mottling measured on the printed surface in the visible critical wavelength range of 1 to 4 mm is reduced by 50% compared to a non-pretreated printing paper.

Claims (6)

Verfahren zur Vermeidung von Druckfleckigkeit bei in Rasterdruckverfahren eingesetzten Druckpapieren, dadurch gekennzeichnet, dass die zur Modulation des Druckbildes führenden Eigenschaften Mikrostruktur, Porosität und/oder Benetzbarkeit der Papieroberfläche durch eine vor dem Druckvorgang aufgebrachte Struktur überlagert werden.Method for avoiding printing blotchiness in printing papers used in screen printing methods, characterized in that the properties leading to the modulation of the printed image microstructure, porosity and / or wettability of the paper surface are superimposed by a structure applied before the printing process. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die überlagerte Struktur aus Elementen besteht, deren Größe unterhalb des Auflösungsvermögens des menschlichen Auges liegt.A method according to claim 1, characterized in that the superimposed structure consists of elements whose size is below the resolution of the human eye. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Größe der Elemente im Bereich von 10 - 100 µm ausgewählt wird.A method according to claim 2, characterized in that the size of the elements in the range of 10 - 100 microns is selected. Verfahren nach Anspruch 2 und 3, dadurch gekennzeichnet, dass die Elemente stochastisch geformt und angeordnet sind.A method according to claim 2 and 3, characterized in that the elements are stochastically shaped and arranged. Verfahren nach Anspruch 2 bis 4, dadurch gekennzeichnet, dass die Elemente durch Druckverfahren auf der Papieroberfläche gebildet werden.A method according to claim 2 to 4, characterized in that the elements are formed by printing processes on the paper surface. Verfahren nach Anspruch 1 bis 5, dadurch gekennzeichnet, dass die die Struktur bildenden Elemente aus einer Druckfarben abstoßenden Substanz bestehen.A method according to claim 1 to 5, characterized in that the structure forming elements consist of a printing ink repellent substance.
EP07004109A 2006-03-04 2007-02-28 Method for avoiding printing spots Withdrawn EP1840265A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610010061 DE102006010061B4 (en) 2006-03-04 2006-03-04 Method for avoiding printing blotch

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EP1840265A2 true EP1840265A2 (en) 2007-10-03
EP1840265A3 EP1840265A3 (en) 2008-06-18

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0245553A2 (en) * 1986-05-12 1987-11-19 Engelhard Corporation Treatment of clays with cationic polymers to prepare high bulking pigments
GB2278314A (en) * 1993-05-28 1994-11-30 Terry John Wood A printing process
EP1245730A1 (en) * 2001-03-28 2002-10-02 Oji Paper Company Limited Coated paper sheet
US6477948B1 (en) * 2000-08-14 2002-11-12 The Proctor & Gamble Company Means for enhancing print color density
US20030113532A1 (en) * 2001-02-28 2003-06-19 Cummings David O. Kaolin pigment products
US20040110885A1 (en) * 1998-04-04 2004-06-10 Husband John Claude Pigment products
DE10333255B3 (en) * 2003-07-21 2005-01-13 Leonhard Kurz Gmbh & Co. Kg Applying high-resolution pattern to substrate, for hot-stamped laminated film or transfer films, by defining fine structuring by orientation direction and profile shape of microscopic surface structure
WO2006003242A2 (en) * 2004-07-02 2006-01-12 Metso Paper, Inc. Method and apparatus for coating a substrate and printed matter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0245553A2 (en) * 1986-05-12 1987-11-19 Engelhard Corporation Treatment of clays with cationic polymers to prepare high bulking pigments
GB2278314A (en) * 1993-05-28 1994-11-30 Terry John Wood A printing process
US20040110885A1 (en) * 1998-04-04 2004-06-10 Husband John Claude Pigment products
US6477948B1 (en) * 2000-08-14 2002-11-12 The Proctor & Gamble Company Means for enhancing print color density
US20030113532A1 (en) * 2001-02-28 2003-06-19 Cummings David O. Kaolin pigment products
EP1245730A1 (en) * 2001-03-28 2002-10-02 Oji Paper Company Limited Coated paper sheet
DE10333255B3 (en) * 2003-07-21 2005-01-13 Leonhard Kurz Gmbh & Co. Kg Applying high-resolution pattern to substrate, for hot-stamped laminated film or transfer films, by defining fine structuring by orientation direction and profile shape of microscopic surface structure
WO2006003242A2 (en) * 2004-07-02 2006-01-12 Metso Paper, Inc. Method and apparatus for coating a substrate and printed matter

Also Published As

Publication number Publication date
DE102006010061B4 (en) 2007-11-08
DE102006010061A1 (en) 2007-09-13
EP1840265A3 (en) 2008-06-18

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