EP0985530B2 - Ink unit having an ink forme roller for a reduction of the mottling ink - Google Patents

Ink unit having an ink forme roller for a reduction of the mottling ink Download PDF

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Publication number
EP0985530B2
EP0985530B2 EP99114183A EP99114183A EP0985530B2 EP 0985530 B2 EP0985530 B2 EP 0985530B2 EP 99114183 A EP99114183 A EP 99114183A EP 99114183 A EP99114183 A EP 99114183A EP 0985530 B2 EP0985530 B2 EP 0985530B2
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Prior art keywords
ink
inking
shore
roller
plate cylinder
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EP99114183A
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German (de)
French (fr)
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EP0985530A3 (en
EP0985530B1 (en
EP0985530A2 (en
Inventor
Edward Ellis Urguhart
James Brian Vrotacoe
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Goss International Americas LLC
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Goss International Americas LLC
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/26—Construction of inking rollers

Definitions

  • the present invention relates to an inking unit in a rotary offset printing machine with an inking roller according to the preamble of claim 1, by means of which the beads of the solids contained in printing inks is reduced.
  • Prior art offset printing machines comprise a plate cylinder having on its surface the image to be printed. This is in rolling contact with a transfer or blanket cylinder, by means of which the image contained on the plate cylinder is transferred to the web or the sheet.
  • the plate cylinder is supplied with ink, which is then transferred to the blanket cylinder and then to the web / sheet.
  • ink supply to the plate cylinder can be accomplished in a variety of ways, most commonly using a color box, i. H. a device in which a ink fountain roller on a container containing ink, the ink fountain, is arranged.
  • a series of ink fountain keys At the interface between the ink fountain floor and the ink fountain roller are a series of ink fountain keys that can be moved toward and away from the ink fountain roller.
  • the spacing of a respective ink fountain key from the ink fountain roller surface determines the thickness of the ink transferred to the outer surface of the ink fountain roller.
  • a metering roller is arranged downstream of the ink fountain key in the direction of rotation.
  • the metering roller leads from one or more rollers, for.
  • the ink is transferred to the plate cylinder via the inking roller.
  • inking rollers have an elastic, relatively soft outer surface made of an elastomer whose hardness is in the range between 22 and 28 Shore A (durometer).
  • the outer surface is also cylindrical and has a uniform outer diameter.
  • an offset printing unit which comprises a blanket cylinder, a plate cylinder, and an inking cylinder having a compliant working surface.
  • a layer of an elastic, ink-accepting material is applied on the inking cylinder. The hardness of this layer is 60 to 70 Shore.
  • an inking roller is known that is designed to reduce the risk of inflammation or loss of ink.
  • a rubber coating is applied along a central region of the cylinder, wherein no rubber coating is provided at the end regions of the cylinder.
  • a drawback encountered in offset printing machines of the prior art is that the solids contained in the ink bead. This results in an uneven ink application to the paper surface, creating a spotty image along the image surface of varying optical density. To compensate for this effect, it has often been necessary in the prior art to increase the amount of ink transferred to the paper.
  • the present invention relates to a device which reduces the beading of the solids contained in printing inks. In this way, the print quality of a printing press is significantly improved by the present invention by a uniform distribution of the color solids is achieved on the entire print image. Furthermore, the present invention achieves a uniform optical density of the printed image with less ink consumption.
  • one or more rollers whose outer surface consists of an elastomer having a hardness between 60 and 90 Shore A (durometer) or between 50 and 100 Shore A (durometer) are used as the inking rollers.
  • the use of such an inking roller ensures a more uniform application of ink to the plate cylinder and thus to the blanket cylinder and the web to be printed.
  • at least the inking roller, which contacts the plate cylinder in the direction of rotation last, is formed as an inking roller with a hard outer surface made of an elastomer.
  • Significantly improved printing results can be achieved, however, if all the inking rollers are designed in this way.
  • the inking roller has a convex shape axially along its length so that the diameter of the hard surface of an elastomer in the axial center is greater than at the axial ends, whereby an optimum contact between the Ink rollers and the plate cylinder is guaranteed.
  • the present invention further relates to a printing machine, with the low ink consumption high print quality and a uniform optical density can be achieved because the ink is applied evenly to the plate cylinder by the inking rollers according to the invention and thus less color must be applied to achieve a certain print quality , Accordingly, the present invention provides an improvement over prior art printing machines in which significantly more color must be used to achieve a given print quality.
  • Fig. 1 shows a schematic representation of a printing press according to the present invention.
  • a material web W, z. B. of paper moves in a manner in the direction of the arrow between a rotating in the direction of arrow upper blanket cylinder B U and a rotating in the direction of arrow lower blanket cylinder B L through that it contacts the two cylinders.
  • On the blanket cylinder B U and B L can each be applied a blanket 12.
  • the plate cylinder and the inking unit by means of which the colored image is transferred to the upper blanket cylinder B U , are not shown.
  • These components are the same or similar to the lower blanket cylinder B L associated components.
  • the inking rollers F 1 , F 2 , F 3 can be fed by any known inking color; in Fig. 1 an inking roller 1 is shown, through which the ink is transferred to the plate cylinder P, which then transmits a colored image on the lower blanket cylinder B L.
  • a rotating ink fountain roller I adjoins an ink fountain 10 and takes from this in a known manner to a color layer, which then transfers them to a metering roll M.
  • the metering roller M By the metering roller M, the ink layer on a series of transfer rollers D and then on the distributor rollers V, a (vibrating) intermediate roller S and a large transfer roller L is transferred.
  • the ink is transferred to one or more inking rollers F 1 , F 2 , F 3 .
  • the inking rollers F 1 , F 2 , F 3 transfer a color layer on the plate cylinder P, but not necessarily three inking rollers must be provided, but the number of inking rollers can be chosen arbitrarily.
  • the printing machine according to the present invention may comprise a downstream in the direction of rotation of the plate cylinder the blanket cylinder B L dampening unit 2, which can be used for wetting the plate cylinder P.
  • a pressure plate 11 is arranged in a known manner, which transmits a colored image on the lower blanket cylinder B L , with which this then the web W imprinted.
  • the inking rollers F 1 , F 2 , F 3 are used to control the thickness and the type of ink layer to be transferred to the plate cylinder P and accordingly the quality of the color printed image on the web W.
  • Fig. 2 and 3 show two embodiments of an inking roller F 1 , F 2 or F 3 according to the invention, the inner core 30 of a relatively strong, rigid material such. As steel.
  • the inner core 30 is preferably hollow to reduce weight and may have pivots 22 for rotatably mounting the inking roll F 1 , F 2 or F 3 at both ends.
  • the hollow core 30 may comprise a suitable cooling mechanism, e.g. B. a cooling liquid channel to avoid overheating of the inking roller F 1 , F 2 or F 3 during the continuous printing operation.
  • At least a portion of the axial length of the inner core 30 is an outer layer 21 made of an elastomer, for. B. Buna® rubber compound or other suitable compressible material applied.
  • the elastomer constituting the outer layer 21 is made relatively hard, that is, having a hardness of 50-100 Shore A, preferably between about 60 and 90 Shore A (durometer), more preferably about 80 Shore A (durometer).
  • the increased hardness of the outer layer 21 brings improved printing results, as it causes a finer and more uniform color separation between the plate cylinder P and the inking rollers F 1 , F 2 or F 3 .
  • the improved color splitting results in an improved deposition of the color solids on the web W after the transfer of the ink from the plate cylinder P to the blanket cylinder B L , resulting in a high quality printed image of high optical density with less ink consumption than conventional printing machines.
  • the inking roller F 1 , F 2 or F 3 along its axial length has a convex shape, so that the diameter d 1 at the ends of the outer layer 21 is smaller than the diameter d 2 at the axial center of the outer layer 21st
  • the degree of camber ie the shape of the curve forming the outside diameter of the outer layer 21, may be determined by standard beam displacement algorithms or computer models depending on the axial length, diameter and materials of the inking rollers F 1 , F 2 and F 3 are determined.
  • the temperature of the inking rollers F 1 , F 2 or F 3 may increase. Therefore, it may be advantageous to use a (not shown) inking roller cooling system z. B. in the form of coolant channels in the cavity in the interior of the inking rollers F 1 , F 2 or F 3 provide.

Description

Die vorliegende Erfindung betrifft ein Farbwerk in einer Rotations-Offsetdruckmaschine mit einer Farbauftragswalze gemäß dem Oberbegriff von Anspruch 1, mittels derer das Perlen der in Druckfarben enthaltenen Feststoffe reduziert wird.The present invention relates to an inking unit in a rotary offset printing machine with an inking roller according to the preamble of claim 1, by means of which the beads of the solids contained in printing inks is reduced.

Offset-Druckmaschinen nach dem Stand der Technik umfassen einen Plattenzylinder, auf dessen Oberfläche das zu druckende Bild enthalten ist. Dieser steht in Rollkontakt mit einem Übertragungs- bzw. Gummituchzylinder, mittels dessen das auf dem Plattenzylinder enthaltene Bild auf die Bahn oder den Bogen übertragen wird. Dem Plattenzylinder wird Farbe zugeführt, die daraufhin auf den Gummituchzylinder und dann auf die Bahn/den Bogen übertragen wird.Prior art offset printing machines comprise a plate cylinder having on its surface the image to be printed. This is in rolling contact with a transfer or blanket cylinder, by means of which the image contained on the plate cylinder is transferred to the web or the sheet. The plate cylinder is supplied with ink, which is then transferred to the blanket cylinder and then to the web / sheet.

In einer Offset-Druckmaschine kann die Farbzufuhr zum Plattenzylinder auf verschiedene Weise erfolgen, am häufigsten unter Verwendung eines Farbkastens, d. h. einer Vorrichtung, bei der eine Farbkastenwalze an einem Druckfarbe enthaltenden Behälter, dem Farbkasten, angeordnet ist. An der Schnittstelle zwischen dem Farbkastenboden und der Farbkastenwalze befinden sich eine Reihe von Farbzonenschrauben, welche auf die Farbkastenwalze zu und von dieser weg bewegt werden können. Der Abstand einer jeweiligen Farbzonenschraube von der Farbkastenwalzenoberfläche bestimmt die Dicke der auf die Außenoberfläche der Farbkastenwalze übertragenen Farbe. In nächster Nähe zu der Farbkastenwalze ist jenseits der Farbzonenschrauben in Drehrichtung eine Dosierwalze nachgeordnet.In an offset printing machine, ink supply to the plate cylinder can be accomplished in a variety of ways, most commonly using a color box, i. H. a device in which a ink fountain roller on a container containing ink, the ink fountain, is arranged. At the interface between the ink fountain floor and the ink fountain roller are a series of ink fountain keys that can be moved toward and away from the ink fountain roller. The spacing of a respective ink fountain key from the ink fountain roller surface determines the thickness of the ink transferred to the outer surface of the ink fountain roller. In the immediate vicinity of the ink fountain roller, a metering roller is arranged downstream of the ink fountain key in the direction of rotation.

Die Dosierwalze führt einem aus einer oder mehreren Walzen, z. B. Reiberwalzen, Heberwalzen, Zwischenwalzen und Farbauftragswalzen bestehenden Farbwalzenzug Farbe zu. Über die Farbauftragswalze wird die Farbe auf den Plattenzylinder übertragen. Gemäß dem Stand der Technik weisen Farbauftragswalzen eine elastische, verhältnismäßig weiche Außenoberfläche aus einem Elastomer auf, deren Härte im Bereich zwischen 22 und 28 Shore A (Durometer) liegt. Die Außenoberfläche ist ferner zylindrisch und weist einen einheitlichen Außendurchmesser auf.The metering roller leads from one or more rollers, for. As distributor rollers, elevator rollers, intermediate rollers and inking rollers existing color roller train to color. The ink is transferred to the plate cylinder via the inking roller. In the prior art, inking rollers have an elastic, relatively soft outer surface made of an elastomer whose hardness is in the range between 22 and 28 Shore A (durometer). The outer surface is also cylindrical and has a uniform outer diameter.

Aus der EP 406 737 A2 ist ein Offset-Druckwerk bekannt, das einen Gummituchzylinder, einen Plattenzylinder und einen Farbauftragszylinder aufweist, der eine nachgiebige Arbeitsoberfläche besitzt. Auf dem Farbauftragszylinder ist eine Schicht aus einem elastischen, farbannehmenden Material aufgebracht. Die Härte dieser Schicht beträgt 60 bis 70 Shore.From the EP 406 737 A2 For example, an offset printing unit is known which comprises a blanket cylinder, a plate cylinder, and an inking cylinder having a compliant working surface. On the inking cylinder, a layer of an elastic, ink-accepting material is applied. The hardness of this layer is 60 to 70 Shore.

Aus der US 3,828,674 ist eine Farbauftragswalze bekannt, die so ausgestaltet ist, dass das Risiko der Entzündung oder der Verlust der Druckfarbe vermindert wird. Dabei wird entlang eines mittleren Bereiches des Zylinders eine Gummibeschichtung aufgetragen, wobei an den Endbereichen des Zylinders keine Gummibeschichtung vorgesehen ist.From the US 3,828,674 For example, an inking roller is known that is designed to reduce the risk of inflammation or loss of ink. In this case, a rubber coating is applied along a central region of the cylinder, wherein no rubber coating is provided at the end regions of the cylinder.

Aus der US 5,113,760 ist weiterhin bekannt, eine Mehrzahl von Farbauftragswalzen vorzusehen. Zur Verbesserung der Farbauftragswalze wird vorgeschlagen, eine synthetische Schicht aufzutragen, die durch die Zugabe von geeigneten Materialien, wie beispielsweise Kupferpulver, so verändert wird, dass eine Härte von mehr als 80 Shore A entsteht.From the US 5,113,760 is also known to provide a plurality of inking rollers. To improve the inking roller, it is proposed to apply a synthetic layer which is modified by the addition of suitable materials, such as copper powder, to give a hardness of more than 80 Shore A.

Aus der EP 279 295 A2 ist weiterhin ein Kurzfarbwerk bekannt, das eine einzige Farbauftragswalze aufweist, deren Shore Härte zwischen 60 und 80 liegt.From the EP 279 295 A2 Furthermore, a short inking unit is known which has a single inking roller whose Shore hardness is between 60 and 80.

Ein in Offset-Druckmaschinen nach dem Stand der Technik auftretender Nachteil besteht darin, daß die in der Druckfarbe enthaltenen Feststoffe perlen. Dies führt zu einem ungleichmäßigen Farbauftrag auf die Papieroberfläche, wodurch ein fleckiges Bild mit entlang der Bildoberfläche unterschiedlicher optischer Dichte entsteht. Um diesen Effekt zu kompensieren, war es gemäß dem Stand der Technik oft nötig, die auf das Papier übertragene Farbmenge zu erhöhen.A drawback encountered in offset printing machines of the prior art is that the solids contained in the ink bead. This results in an uneven ink application to the paper surface, creating a spotty image along the image surface of varying optical density. To compensate for this effect, it has often been necessary in the prior art to increase the amount of ink transferred to the paper.

Demgemäß ist es eine Aufgabe der vorliegenden Erfindung, eine Vorrichtung zu schaffen, mittels derer das Auftreten des Perleffekts verringert werden kann.Accordingly, it is an object of the present invention to provide an apparatus by means of which the occurrence of the pearling effect can be reduced.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale von Anspruch 1 gelöst.This object is achieved by the features of claim 1.

Weitere Aufgaben und Merkmale der vorliegenden Erfindung ergeben sich aus den Unteransprüchen.Other objects and features of the present invention will become apparent from the dependent claims.

Die vorliegende Erfindung betrifft eine Vorrichtung, durch die das Perlen der in Druckfarben enthaltenen Feststoffe verringert wird. Auf diese Weise wird durch die vorliegende Erfindung die Druckqualität einer Druckmaschine deutlich verbessert, indem eine gleichmäßige Verteilung der Farbfeststoffe auf dem gesamten Druckbild erreicht wird. Ferner wird durch die vorliegende Erfindung bei geringerem Farbverbrauch eine gleichmäßige optische Dichte des Druckbilds erzielt.The present invention relates to a device which reduces the beading of the solids contained in printing inks. In this way, the print quality of a printing press is significantly improved by the present invention by a uniform distribution of the color solids is achieved on the entire print image. Furthermore, the present invention achieves a uniform optical density of the printed image with less ink consumption.

Gemäß der vorliegenden Erfindung werden als Farbauftragswalzen eine oder mehrere Walzen eingesetzt, deren Außenoberfläche aus einem Elastomer besteht, welches eine Härte zwischen 60 und 90 Shore A (Durometer) oder auch zwischen 50 und 100 Shore A (Durometer) besitzt. Der Einsatz einer derartigen Farbauftragswalze gewährleistet einen gleichmäßigeren Farbauftrag auf den Plattenzylinder und somit auf den Gummituchzylinder und die zu bedruckende Bahn. Ist mehr als eine Farbauftragswalze vorgesehen, so ist mindestens die Farbauftragswalze, die der Plattenzylinder in Drehrichtung als letztes kontaktiert, als Farbauftragswalze mit einer harten Außenoberfläche aus einem Elastomer ausgebildet. Deutlich verbesserte Druckergebnisse können jedoch erreicht werden, wenn alle Farbwalzen derartig ausgebildet sind.According to the present invention, one or more rollers whose outer surface consists of an elastomer having a hardness between 60 and 90 Shore A (durometer) or between 50 and 100 Shore A (durometer) are used as the inking rollers. The use of such an inking roller ensures a more uniform application of ink to the plate cylinder and thus to the blanket cylinder and the web to be printed. If more than one inking roller is provided, at least the inking roller, which contacts the plate cylinder in the direction of rotation last, is formed as an inking roller with a hard outer surface made of an elastomer. Significantly improved printing results can be achieved, however, if all the inking rollers are designed in this way.

Gemäß einem Aspekt der vorliegenden Erfindung weist die Farbauftragswalze axial entlang ihrer Länge eine konvexe Form auf, so daß der Durchmesser der harten Oberfläche aus einem Elastomer in der axialen Mitte größer als an den axialen Enden ist, wodurch ein optimaler Kontakt zwischen den Farbauftragswalzen und dem Plattenzylinder gewährleistet wird.According to one aspect of the present invention, the inking roller has a convex shape axially along its length so that the diameter of the hard surface of an elastomer in the axial center is greater than at the axial ends, whereby an optimum contact between the Ink rollers and the plate cylinder is guaranteed.

Die vorliegende Erfindung betrifft ferner eine Druckmaschine, mit der bei niedrigem Farbverbrauch eine hohe Druckqualität und eine gleichmäßige optische Dichte erreicht werden kann, da durch die erfindungsgemäßen Farbauftragswalzen die Druckfarbe gleichmäßig auf den Plattenzylinder aufgetragen wird und somit zur Erreichung einer bestimmten Druckqualität weniger Farbe aufgetragen werden muß. Demgemäß bedeutet die vorliegende Erfindung eine Verbesserung gegenüber Druckmaschinen nach dem Stand der Technik, in denen zur Erreichung einer bestimmten Druckqualität wesentlich mehr Farbe eingesetzt werden muß.The present invention further relates to a printing machine, with the low ink consumption high print quality and a uniform optical density can be achieved because the ink is applied evenly to the plate cylinder by the inking rollers according to the invention and thus less color must be applied to achieve a certain print quality , Accordingly, the present invention provides an improvement over prior art printing machines in which significantly more color must be used to achieve a given print quality.

Weitere Aufgaben und Vorteile der vorliegenden Erfindung werden in der folgenden detaillierten Beschreibung bevorzugter Ausführungsbeispiele in Zusammenhang mit den beigefügten, nachfolgend aufgeführten Zeichnungen näher erläutert.Other objects and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, which are given below.

Es zeigen:

Fig. 1
eine schematische Vorderansicht eines Farbwalzenzugs einer Offset-Druckmaschine gemäß der vorliegenden Erfindung;
Fig. 2
eine Vorderansicht sowie eine Innenansicht einer Farbauftragswalze gemäß einer ersten Ausführungsform der vorliegenden Erfindung;
Fig. 3
eine Vorderansicht sowie eine Innenansicht einer Farbauftragswalze gemäß einer zweiten Ausführungsform der vorliegenden Erfindung.
Show it:
Fig. 1
a schematic front view of a color roller train of an offset printing machine according to the present invention;
Fig. 2
a front view and an interior view of an inking roller according to a first embodiment of the present invention;
Fig. 3
a front view and an interior view of an inking roller according to a second embodiment of the present invention.

Fig. 1 zeigt eine schematische Darstellung einer Druckmaschine gemäß der vorliegenden Erfindung. Eine Materialbahn W, z. B. aus Papier, bewegt sich in einer Weise in Pfeilrichtung zwischen einem sich in Pfeilrichtung drehenden oberen Gummituchzylinder BU und einem sich in Pfeilrichtung drehenden unteren Gummituchzylinder BL hindurch, daß sie die beiden Zylinder kontaktiert. Auf die Gummituchzylinder BU und BL kann jeweils ein Gummituch 12 aufgebracht sein. Aus Gründen der Übersichtlichkeit sind der Plattenzylinder und das Farbwerk, mittels derer das farbige Bild auf den oberen Gummituchzylinder BU übertragen wird, nicht gezeigt. Diese Bauteile sind den dem unteren Gummituchzylinder BL zugeordneten Bauteilen gleich oder ähnlich ausgebildet. Fig. 1 shows a schematic representation of a printing press according to the present invention. A material web W, z. B. of paper, moves in a manner in the direction of the arrow between a rotating in the direction of arrow upper blanket cylinder B U and a rotating in the direction of arrow lower blanket cylinder B L through that it contacts the two cylinders. On the blanket cylinder B U and B L can each be applied a blanket 12. For reasons of clarity, the plate cylinder and the inking unit, by means of which the colored image is transferred to the upper blanket cylinder B U , are not shown. These components are the same or similar to the lower blanket cylinder B L associated components.

Den Farbauftragswalzen F1, F2, F3 kann durch jedes beliebige bekannte Farbwerk Farbe zugeführt werden; in Fig. 1 is ein Farbwalzenzug 1 dargestellt, durch den die Farbe auf den Plattenzylinder P übertragen wird, der daraufhin ein farbiges Bild auf den unteren Gummituchzylinder BL überträgt. Eine sich drehende Farbkastenwalze I grenzt an einen Farbkasten 10 an und nimmt aus diesem in bekannter Weise eine Farbschicht auf, die sie dann auf eine Dosierwalze M überträgt. Durch die Dosierwalze M wird die Farbschicht auf eine Reihe von Übertragswalzen D und daraufhin auf die Reiberwalzen V, eine (schwingende) Zwischenwalze S und eine große Übertragswalze L übertragen. Von den Reiberwalzen V wird die Farbe auf eine oder mehrere Farbauftragswalzen F1, F2, F3 übertragen. Die Farbauftragswalzen F1, F2, F3 übertragen eine Farbschicht auf den Plattenzylinder P, wobei jedoch nicht unbedingt drei Farbauftragswalzen vorgesehen sein müssen, sondern die Anzahl der Farbauftragswalzen beliebig gewählt werden kann.The inking rollers F 1 , F 2 , F 3 can be fed by any known inking color; in Fig. 1 an inking roller 1 is shown, through which the ink is transferred to the plate cylinder P, which then transmits a colored image on the lower blanket cylinder B L. A rotating ink fountain roller I adjoins an ink fountain 10 and takes from this in a known manner to a color layer, which then transfers them to a metering roll M. By the metering roller M, the ink layer on a series of transfer rollers D and then on the distributor rollers V, a (vibrating) intermediate roller S and a large transfer roller L is transferred. From the distributor rollers V, the ink is transferred to one or more inking rollers F 1 , F 2 , F 3 . The inking rollers F 1 , F 2 , F 3 transfer a color layer on the plate cylinder P, but not necessarily three inking rollers must be provided, but the number of inking rollers can be chosen arbitrarily.

Die Druckmaschine gemäß der vorliegenden Erfindung kann ein in Drehrichtung des Plattenzylinders dem Gummituchzylinder BL nachgeordnetes Feuchtwerk 2 umfassen, das zum Befeuchten des Plattenzylinders P eingesetzt werden kann.The printing machine according to the present invention may comprise a downstream in the direction of rotation of the plate cylinder the blanket cylinder B L dampening unit 2, which can be used for wetting the plate cylinder P.

Auf der Außenoberfläche des Plattenzylinders P ist in bekannter Weise eine Druckplatte 11 angeordnet, welche auf den unteren Gummituchzylinder BL ein farbiges Bild überträgt, mit welchem dieser daraufhin die Bahn W bedruckt. Über die Farbauftragswalzen F1, F2, F3 wird die Dicke und die Art der auf den Plattenzylinder P zu übertragenden Farbschicht und demgemäß die Qualität des farbigen Druckbildes auf der Bahn W gesteuert.On the outer surface of the plate cylinder P a pressure plate 11 is arranged in a known manner, which transmits a colored image on the lower blanket cylinder B L , with which this then the web W imprinted. The inking rollers F 1 , F 2 , F 3 are used to control the thickness and the type of ink layer to be transferred to the plate cylinder P and accordingly the quality of the color printed image on the web W.

Fig. 2 und 3 zeigen zwei Ausführungsformen einer erfindungsgemäßen Farbauftragswalze F1, F2 oder F3, die einen inneren Kern 30 aus einem verhältnismäßig festen, steifen Material wie z. B. Stahl umfaßt. Der innere Kern 30 ist zur Reduzierung des Gewichts vorzugsweise hohl und kann zum drehbaren Befestigen der Farbauftragswalze F1, F2 oder F3 an beiden Enden Zapfen 22 aufweisen. Der hohle Kern 30 kann einen geeigneten Kühlungsmechanismus umfassen, z. B. einen Kühlflüssigkeitskanal, um ein Überhitzen der Farbauftragswalze F1, F2 oder F3 während des Fortdruckbetriebs zu vermeiden. Fig. 2 and 3 show two embodiments of an inking roller F 1 , F 2 or F 3 according to the invention, the inner core 30 of a relatively strong, rigid material such. As steel. The inner core 30 is preferably hollow to reduce weight and may have pivots 22 for rotatably mounting the inking roll F 1 , F 2 or F 3 at both ends. The hollow core 30 may comprise a suitable cooling mechanism, e.g. B. a cooling liquid channel to avoid overheating of the inking roller F 1 , F 2 or F 3 during the continuous printing operation.

Auf mindestens einen Teil der axialen Länge des inneren Kerns 30 ist eine äußere Schicht 21 aus einem Elastomer, z. B. Buna® Gummimischung oder einem anderen geeigneten kompressiblen Material, aufgebracht. Das Elastomer, aus dem die äußere Schicht 21 besteht, ist relativ hart ausgebildet, d. h. mit einer Härte von 50-100 Shore A, vorzugsweise zwischen ca. 60 und 90 Shore A (Durometer), insbesondere ungefähr 80 Shore A (Durometer). Die erhöhte Härte der äußeren Schicht 21 bringt verbesserte Druckergebnisse, da sie eine feinere und gleichmäßigere Farbspaltung zwischen dem Plattenzylinder P und den Farbauftragswalzen F1, F2 oder F3 bewirkt. Die verbesserte Farbspaltung führt zu einer verbesserten Ablagerung der Farbfeststoffe auf der Materialbahn W nach der Übertragung der Farbe von dem Plattenzylinder P auf den Gummituchzylinder BL, wodurch bei geringerem Farbverbrauch als bei herkömmlichen Druckmaschinen ein qualitativ hochwertiges Druckbild von hoher optischer Dichte entsteht.At least a portion of the axial length of the inner core 30 is an outer layer 21 made of an elastomer, for. B. Buna® rubber compound or other suitable compressible material applied. The elastomer constituting the outer layer 21 is made relatively hard, that is, having a hardness of 50-100 Shore A, preferably between about 60 and 90 Shore A (durometer), more preferably about 80 Shore A (durometer). The increased hardness of the outer layer 21 brings improved printing results, as it causes a finer and more uniform color separation between the plate cylinder P and the inking rollers F 1 , F 2 or F 3 . The improved color splitting results in an improved deposition of the color solids on the web W after the transfer of the ink from the plate cylinder P to the blanket cylinder B L , resulting in a high quality printed image of high optical density with less ink consumption than conventional printing machines.

Aufgrund der erhöhten Härte der Außenschicht 21 der erfindungsgemäßen Farbauftragswalze F1, F2 oder F3 ist diese steifer und weniger nachgiebig als herkömmliche Farbauftragswalzen, wodurch es beim Einsatz einer Standard-Farbauftragswalze mit gleichmäßigem Außendurchmesser zu einer Veränderung des 5 Kontaktstreifens zwischen der Farbauftragswalze und dem Plattenzylinder kommt. Zur Vermeidung dieses Effekts weist die Farbauftragswalze F1, F2 oder F3 entlang ihrer axialen Länge eine konvexe Form auf, so daß der Durchmesser d1 an den Enden der Außenschicht 21 kleiner ist als der Durchmesser d2 an der axialen Mitte der Außenschicht 21. Der Grad der Wölbung, d. h. die Form der Kurve, welche den Außendurchmesser der Außenschicht 21 bildet, kann nach Standard-Strahlversetzungs-Algorithmen oder Computermodellen in Abhängigkeit von der axialen Länge, dem Durchmesser und den Materialien der Farbauftragswalzen F1, F2 und F3 bestimmt werden.Due to the increased hardness of the Outer layer 21 of the inking roller F1, F2 or F3 according to the invention is this stiffer and less flexible than conventional inking rollers, whereby it comes to a change in the 5 contact strip between the inking roller and the plate cylinder when using a standard inking roller with uniform outer diameter. To avoid this effect, the inking roller F 1 , F 2 or F 3 along its axial length has a convex shape, so that the diameter d 1 at the ends of the outer layer 21 is smaller than the diameter d 2 at the axial center of the outer layer 21st The degree of camber, ie the shape of the curve forming the outside diameter of the outer layer 21, may be determined by standard beam displacement algorithms or computer models depending on the axial length, diameter and materials of the inking rollers F 1 , F 2 and F 3 are determined.

Beim Einsatz von mehr als einer Farbauftragswalze hat es sich als am günstigsten erwiesen, die Farbauftragswalze mit der harten Außenschicht 21 als in Drehrichtung des Plattenzylinders P letzte Farbauftragswalze anzuordnen, d. h. in der Position der Farbauftragswalze F3 in Fig. 1, und die anderen beiden Farbauftragswalzen mit einer üblichen Härte, z. B. im Bereich von 27-35 Shore A auszubilden. Verbesserte Druckergebnisse können erzielt werden, wenn jede der Farbauftragswalzen F1, F2 und F3 eine harte Außenschicht 21 aufweist.When using more than one inking roller, it has proved to be most advantageous to arrange the inking roller with the hard outer layer 21 as in the direction of rotation of the plate cylinder P last inking roller, ie in the position of the inking roller F 3 in Fig. 1 , And the other two inking rollers with a conventional hardness, z. B. in the range of 27-35 Shore A form. Improved printing results can be achieved when each of the inking rollers F 1 , F 2 and F 3 has a hard outer layer 21.

Durch das Aufbringen einer harten Schicht auf der Außenoberfläche einer oder mehrerer der Farbauftragswalzen F1, F2 oder F3 kann es während des Fortdruckbetriebs zu einer Erhöhung der Temperatur der Farbauftragswalzen F1, F2 oder F3 kommen. Daher kann es vorteilhaft sein, ein (nicht gezeigtes) Farbauftragswalzen-Kühlsystem z. B. in Form von Kühlflüssigkeits-Kanälen im Hohlraum im Innern der Farbauftragswalzen F1, F2 oder F3 vorzusehen.By applying a hard layer on the outer surface of one or more of the inking rollers F 1 , F 2 or F 3 , during the printing operation, the temperature of the inking rollers F 1 , F 2 or F 3 may increase. Therefore, it may be advantageous to use a (not shown) inking roller cooling system z. B. in the form of coolant channels in the cavity in the interior of the inking rollers F 1 , F 2 or F 3 provide.

LISTE DER BEZUGSZEICHENLIST OF REFERENCE SIGNS

11
Farbwalzenzugink train
22
Feuchtwerkdampening
1010
Farbkastenpaintbox
1111
Druckplatteprinting plate
1212
Gummituchblanket
2121
Außenschichtouter layer
2222
Zapfenspigot
3030
innerer Kerninner core
BL B L
unterer Gummituchzylinderlower blanket cylinder
BU B U
oberer Gummituchzylinderupper blanket cylinder
DD
Übertragungswalzetransfer roller
F1 F 1
FarbauftragswalzeInking roller
F2 F 2
FarbauftragswalzeInking roller
F3 F 3
FarbauftragswalzeInking roller
II
FarbkastenwalzeInk fountain roller
LL
große Übertragungswalzelarge transfer roller
MM
Dosierwalzemetering
PP
Plattenzylinderplate cylinder
SS
Schwingwalzeswing roll
VV
Reiberwalzedistributor roller
WW
Materialbahnweb

Claims (6)

  1. Inking unit in a rotary offset printing press with at least one ink form roller (F1, F2, F3) arranged at a plate cylinder (P), the inking roller (F1, F2, F3) having an inner core (30) and an outer layer (21), characterized in that a plurality of ink form rollers (F1, F2, F3) is provided at the circumference of the plate cylinder (P) which rollers transfer an ink layer to the plate cylinder, with the ink form roller (F3) arranged last as viewed in the direction of circumferential rotation of the plate cylinder (P) having an outer layer (21) with a hardness ranging between 50 Shore A and 100 Shore A, and characterized in that the outer surface of the outer layer (21) has a convex shape along the axial length of the outer layer (21).
  2. Inking unit according to claim 1, characterized in that the hardness of the outer layer (21) is between about 60 Shore A and 90 Shore A, in particular about 80 Shore A.
  3. Inking unit according to one of the preceding claims, characterized in that the outer layer (21) includes an elastomeric material such as rubber.
  4. Inking unit according to one of claims 1 to 3, characterized in that the ink form rollers (F1, F2) arranged upstream of the last ink form roller (F3) as viewed in the direction of circumferential rotation of the plate cylinder (P) have an outer layer (21) with a lower hardness ranging between 20 Shore A and 40 Shore A, in particular between 27 and 35 Shore A.
  5. Inking unit according to one of claims 1 to 3, characterized in that the ink form rollers (F1, F2) arranged upstream of the last ink form roller (F3) as viewed in the direction of circumferential rotation of the plate cylinder (P) have an outer layer (21) with a hardness ranging between 50 and 100 Shore A.
  6. Printing unit having an inking unit according to one of the preceding claims.
EP99114183A 1998-08-10 1999-07-22 Ink unit having an ink forme roller for a reduction of the mottling ink Expired - Lifetime EP0985530B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/131,564 US6098540A (en) 1998-08-10 1998-08-10 Apparatus and method for reducing mottling in printing presses
US131564 2002-04-23

Publications (4)

Publication Number Publication Date
EP0985530A2 EP0985530A2 (en) 2000-03-15
EP0985530A3 EP0985530A3 (en) 2000-10-04
EP0985530B1 EP0985530B1 (en) 2003-09-24
EP0985530B2 true EP0985530B2 (en) 2009-01-14

Family

ID=22450006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99114183A Expired - Lifetime EP0985530B2 (en) 1998-08-10 1999-07-22 Ink unit having an ink forme roller for a reduction of the mottling ink

Country Status (6)

Country Link
US (1) US6098540A (en)
EP (1) EP0985530B2 (en)
JP (1) JP2000052625A (en)
CN (1) CN1131780C (en)
DE (2) DE19934395B4 (en)
HK (1) HK1023095A1 (en)

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DE19911180C2 (en) * 1999-03-12 2001-02-01 Koenig & Bauer Ag Printing unit for a rotary printing machine
US7055428B2 (en) * 2002-04-11 2006-06-06 Koenig & Bauer Aktiengesellschaft Characterization, determination of a characteristic number and selection of suitable dressings on cylinders of a printing press
WO2005118293A1 (en) * 2004-05-21 2005-12-15 Demaxz, L.L.C. Apparatus for printing on substrates of timber or synthetic material
CN1939721B (en) * 2005-09-27 2010-12-15 海德堡印刷机械股份公司 Press temperature controlling method
DE102006015481B4 (en) 2006-01-04 2009-07-09 Koenig & Bauer Aktiengesellschaft Roller of a printing machine
DE102006011477B4 (en) * 2006-03-13 2007-12-27 Koenig & Bauer Aktiengesellschaft Printing unit with a split form cylinder
CN101045367A (en) * 2006-03-28 2007-10-03 海德堡印刷机械股份公司 Overlapping curve roller printing device
DE102006015482B4 (en) * 2006-04-03 2010-06-24 Koenig & Bauer Aktiengesellschaft Roller of a printing machine
DE102006015490B4 (en) * 2006-04-03 2009-11-12 Koenig & Bauer Aktiengesellschaft Web-fed printing machine with a film inking unit
DE102006046521A1 (en) * 2006-09-29 2008-04-03 Man Roland Druckmaschinen Ag Rotary offset printing station has at least one cylinder, e.g. the transfer cylinder, with segments of different diameters along the body axial length to compensate for cylinder bending
US8726807B2 (en) * 2007-06-04 2014-05-20 Goss International Americas, Inc. Smooth roller with low line load and methods
US20120279407A1 (en) * 2011-05-06 2012-11-08 Phoenix Machinery Paper coater apparatus and process

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DE9310713U1 (en) † 1993-07-17 1993-09-02 Roland Man Druckmasch Inking roller
DE4436973A1 (en) † 1993-12-21 1995-06-22 Heidelberger Druckmasch Ag Blanket with varying profile

Also Published As

Publication number Publication date
EP0985530A3 (en) 2000-10-04
CN1244462A (en) 2000-02-16
EP0985530B1 (en) 2003-09-24
CN1131780C (en) 2003-12-24
DE19934395B4 (en) 2012-11-08
DE59907097D1 (en) 2003-10-30
HK1023095A1 (en) 2000-09-01
DE19934395A1 (en) 2000-02-17
EP0985530A2 (en) 2000-03-15
JP2000052625A (en) 2000-02-22
US6098540A (en) 2000-08-08

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