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EP0141217B1 - Device for damping printing plates in rotary printing machines - Google Patents

Device for damping printing plates in rotary printing machines Download PDF

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Publication number
EP0141217B1
EP0141217B1 EP84111153A EP84111153A EP0141217B1 EP 0141217 B1 EP0141217 B1 EP 0141217B1 EP 84111153 A EP84111153 A EP 84111153A EP 84111153 A EP84111153 A EP 84111153A EP 0141217 B1 EP0141217 B1 EP 0141217B1
Authority
EP
European Patent Office
Prior art keywords
roller
dampening
printing
solution
damping
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
Application number
EP84111153A
Other languages
German (de)
French (fr)
Other versions
EP0141217A1 (en
Inventor
Rudolf Annecke
Rainer Burger
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0141217A1 publication Critical patent/EP0141217A1/en
Application granted granted Critical
Publication of EP0141217B1 publication Critical patent/EP0141217B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/30—Damping devices using spraying elements

Definitions

  • the invention relates to a device for moistening printing plates in rotary printing presses with three rollers by spraying or spinning liquid droplets onto a first roller with a hard, dampening agent-friendly surface.
  • DE-AS 22 58 321 shows a spray dampening unit which, based on the prior art mentioned above, has an additional roller (grater) between the first roller to be sprayed and the dampening agent application roller. Following the general rule recognized in inking and dampening technology, this roller also has a hard, usually metallic surface. As is known, such a distribution cylinder is driven forcibly while the dampening solution applicator roller is carried along by friction. Such intermediate distribution cylinders are usually chrome-plated, i.e. provided with a water- or dampening agent-friendly layer. The dampening solution applicator roller, on the other hand, must always be soft (elastic), which is why it e.g. is plastic or rubber coated.
  • the object of the invention is to further develop a dampening unit of the type described at the outset, which enables better quality moistening without additional effort on rollers, so that drop-like irregularities frequently caused by dampening agents on printed products caused by dampening solutions on the rollers no longer occur.
  • this fine emulsion in the contactless dampening system according to the invention replaces the uniform water or dampening solution film which cannot be produced with a rubber roller and a hard distribution cylinder, and thereby allows problem-free printing.
  • the additional (rubber) roller is inserted between the dampening roller and the distribution cylinder, it acts in the described positive manner in both directions of rotation, i.e. even with a so-called “rewetting”.
  • the offset printing unit shown is used in rotary printing presses, for example for newspaper printing, and comprises a central impression cylinder 1 (satellite cylinder) around which the blanket cylinders 2 to 5 are arranged.
  • Each of the blanket cylinders 2 to 5 is assigned to one of the plate cylinders 6 to 9, which in turn is in a conventional manner with one of the inking and dampening units 10, 14; 11, 15; 12, 16; 13, 17 are equipped.
  • the lower right dampening unit 16 within the scope of the present invention.
  • This comprises a spray device 18, in its place one or more brushes or spray nozzles can also be used, for example.
  • the dampening solution to be applied for example water
  • the first roller 19 is preferably chrome-plated.
  • the droplets are fed to a further roller 20 which is arranged between the hard roller 19 and the soft dampening solution application roller 21 which is in contact with the plate cylinder 8.
  • the dampening solution reaches the pressure plate to be moistened via the roller 21, which is also rubberized, for example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Printing Plates And Materials Therefor (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Befeuchten von Druckplatten in Rotationsdruckmaschinen mit drei Walzen durch Aufsprühen oder -schleudern von Flüssigkeitströpfchen auf eine erste Walze mit harter, feuchtmittelfreudiger Oberfläche.The invention relates to a device for moistening printing plates in rotary printing presses with three rollers by spraying or spinning liquid droplets onto a first roller with a hard, dampening agent-friendly surface.

Aus der DE-B-22 21 289 ist es bekannt, auf eine Walze Feuchtmittel aufzusprühen, das über einen harten Reiber zu einer weichen Auftragwalze gelangt. Aus der JP-A-58 74 348 ist es zwar bekannt, anstelle des Reibers eine weiche Walze zu verwenden, jedoch handelt es sich hier um ein Vierwalzen-Feuchtwerk.From DE-B-22 21 289 it is known to spray dampening solution onto a roller which reaches a soft applicator roller via a hard grater. From JP-A-58 74 348 it is known to use a soft roller instead of the grater, but this is a four-roller dampening unit.

Die DE-AS 22 58 321 zeigt ein Sprühfeuchtwerk, das, bezogen auf den vorangehend erwähnten Stand der Technik, eine zusätzliche Walze (Reiber) zwischen der zu besprühenden ersten Walze und der Feuchtmittelauftragwalze aufweist. Der allgemeinen, in der Farbwerk- und Feuchtwerktechnik anerkannten Regel folgend weist auch diese Walze eine harte, üblicherweise metallische Oberfläche auf. Ein derartiger Reibzylinder wird bekanntlich zwangsweise angetrieben, während die Feuchtmittelauftragwalze durch Friktion mitgenommen wird. Solche zwischengeschaltete Reibzylinder sind üblicherweise verchromt, d.h. mit einer wasser- bzw. feuchtmittelfreundlichen Schicht versehen. Die Feuchtmittelauftragwalze muß hingegen stets weich (elastisch) sein, weshalb sie z.B. kunststoff- oder gummibeschichtet ist. Alle bisher bekannten und in der Praxis üblichen weichen Walzenbezüge, wie sie für die erwähnte Feuchtmittelauftragwalze in Frage kommen, nehmen jedoch Farbe an. Die Farbe auf der Feuchtmittelauftragwalze verhindert nun aber die Bildung einer geschlossenen und gleichmäßigen Wasserschicht, da das Wasser mehr oder weniger tropfenartig auf dieser bisher unerwünschten Farbschicht aufliegt oder in diese eingearbeitet ist. Besonders nachteilig wirkt sich diese Erscheinung bei sogenannten «nachfeuchtenden Druckwerken» aus, bei denen der Wasser- bzw. Feuchtmittelauftrag auf die zu befeuchtende Druckplatte nach dem Einfärben erfolgt. Da in diesem Falle keine glättende Wirkung durch die Farbauftragwalzen vorhanden ist, wird der gestörte Wasserauftrag direkt im Druckbild sichtbar. «Tropfenbildung» auf den Druckexemplaren ist häufig zu beobachten. Verschiedentlich hat man sich bisher dadurch beholfen, daß man den Gummibelag der Feuchtmittelauftragwalze mit textilen oder filzartigen Überzügen versehen hat, die durch ihre Wasserspeicherung die Farbe abstoßen sollten, um somit die Feuchtmittelfilmbildung zu fördern. Aus diesem Grunde hat man sich auch bisher darauf beschränkt, zwischen dem Reibzylinder (harte, metallische Oberfläche) und dem die zu befeuchtende Druckplatte tragenden Zylinder nur die unvermeidliche Feuchtauftragwalze zu plazieren.DE-AS 22 58 321 shows a spray dampening unit which, based on the prior art mentioned above, has an additional roller (grater) between the first roller to be sprayed and the dampening agent application roller. Following the general rule recognized in inking and dampening technology, this roller also has a hard, usually metallic surface. As is known, such a distribution cylinder is driven forcibly while the dampening solution applicator roller is carried along by friction. Such intermediate distribution cylinders are usually chrome-plated, i.e. provided with a water- or dampening agent-friendly layer. The dampening solution applicator roller, on the other hand, must always be soft (elastic), which is why it e.g. is plastic or rubber coated. However, all of the previously known soft roller covers that are customary in practice, such as are suitable for the aforementioned fountain solution applicator roller, take on color. The ink on the dampening solution applicator roller now prevents the formation of a closed and uniform water layer, since the water rests more or less like drops on this previously undesired ink layer or is incorporated into it. This phenomenon is particularly disadvantageous in the case of so-called “rewetting printing units”, in which the water or dampening solution is applied to the printing plate to be moistened after inking. In this case, since there is no smoothing effect due to the inking rollers, the disturbed water application is directly visible in the print image. "Drop formation" on the printed copies can often be observed. Various solutions have so far been used in that the rubber covering of the dampening solution applicator roller has been provided with textile or felt-like coatings, which should repel the ink due to their water storage, in order to promote the formation of dampening solution film. For this reason, it has so far been limited to placing only the inevitable dampening roller between the distribution cylinder (hard, metallic surface) and the cylinder carrying the printing plate to be moistened.

Aufgabe der Erfindung ist es, ein Feuchtwerk der eingangs bezeichneten Gattung so weiterzubilden, das ohne zusätzlichen Aufwand an Walzen eine qualitativ bessere Befeuchtung ermöglicht, so daß durch derartige Feuchtwerke auf Druckprodukten häufig sichtbare, durch Feuchtmittel auf den Walzen hervorgerufene tropfenförmige Unregelmäßigkeiten nicht mehr auftreten.The object of the invention is to further develop a dampening unit of the type described at the outset, which enables better quality moistening without additional effort on rollers, so that drop-like irregularities frequently caused by dampening agents on printed products caused by dampening solutions on the rollers no longer occur.

Diese Aufgabe wird in überraschend einfacher Weise durch die Anwendung der Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen in Verbindung mit der Beschreibung und der beiliegenden Zeichnung. Durch die Verwendung einer weiteren Walze mit weicher Oberfläche, beispielsweise einer Gummiwalze oder textilbeschichteten Walze zwischen der Feuchtmittelauftragwalze und dem Reibzylinder, wurde überraschenderweise festgestellt, daß die vorgenannten Probleme nicht noch verstärkt und die Bildung eines qualitativ hochwertigen und gleichmäßigen Filmes verhindert werden, sondern, ganz im Gegenteil, offenbar durch die zusätzliche Walkarbeit der zwischengeschalteten weichen Walze die Emulsionsbildung zwischen Farbe und Wasser gefördert wird. In völlig überraschender Weise ersetzt diese feine Emulsion in dem erfindungsgemäßen, kontaktlosen Feuchtwerk den mit einer Gummiwalze und einem harten Reibzylinder nicht zu erzeugenden, gleichmäßigen Wasser- bzw. Feuchtmittelfilm und erlaubt dadurch problemloses Drucken. Nachdem die zusätzliche (Gummi-)Walze zwischen Feuchtauftragwalze und Reibzylinder eingefügt ist, wirkt sie in der geschilderten positiven Weise in beiden Drehrichtungen, d.h. auch bei einer sogenannten «Nachfeuchtung».This object is achieved in a surprisingly simple manner by applying the features of claim 1. Advantageous further developments result from the subclaims in connection with the description and the attached drawing. By using a further roller with a soft surface, for example a rubber roller or a textile-coated roller between the dampening solution application roller and the distribution cylinder, it was surprisingly found that the aforementioned problems are not exacerbated and the formation of a high-quality and uniform film is prevented, but rather entirely On the contrary, apparently the additional flexing work of the intermediate soft roller promotes the formation of emulsions between paint and water. In a completely surprising manner, this fine emulsion in the contactless dampening system according to the invention replaces the uniform water or dampening solution film which cannot be produced with a rubber roller and a hard distribution cylinder, and thereby allows problem-free printing. After the additional (rubber) roller is inserted between the dampening roller and the distribution cylinder, it acts in the described positive manner in both directions of rotation, i.e. even with a so-called “rewetting”.

Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels beschrieben, wobei Bezug auf die beiliegende Zeichnung genommen wird.The invention is described below using an exemplary embodiment, reference being made to the accompanying drawing.

Das dargestellte Offsetdruckwerk wird in Rotationsdruckmaschinen, beispielsweise für Zeitungsdruck, verwendet und umfaßt einen zentralen Gegendruckzylinder 1 (Satellitenzylinder), um den Gummizylinder 2 bis 5 angeordnet sind. Jedem der Gummizylinder 2 bis 5 ist einer der Plattenzylinder 6 bis 9 zugeordnet, die wiederum in herkömmlicher Weise jeweils mit einem der Farb- und Feuchtwerke 10, 14; 11, 15; 12, 16; 13, 17 ausgestattet sind.The offset printing unit shown is used in rotary printing presses, for example for newspaper printing, and comprises a central impression cylinder 1 (satellite cylinder) around which the blanket cylinders 2 to 5 are arranged. Each of the blanket cylinders 2 to 5 is assigned to one of the plate cylinders 6 to 9, which in turn is in a conventional manner with one of the inking and dampening units 10, 14; 11, 15; 12, 16; 13, 17 are equipped.

Beispielhaft wird im Rahmen der vorliegenden Erfindung nur Bezug auf das rechte untere Feuchtwerk 16 genommen. Dieses umfaßt eine Sprühvorrichtung 18, an deren Stelle auch beispielsweise eine oder mehrere Bürsten oder Sprühdüsen verwendet werden können. Mit Hilfe der Sprühvorrichtung 18 wird das aufzubringende Feuchtmittel, beispielsweise Wasser, in Tropfenform auf eine erste Walze 19, einen sogenannten Reibzylinder mit harter, metallischer Oberfläche, aufgesprüht. Vorzugsweise ist die erste Walze 19 verchromt. Die Tröpfchen werden einer weiteren Walze 20 zugeführt, die zwischen der harten Walze 19 und der weichen Feuchtmittelauftragwalze 21, die mit dem Plattenzylinder 8 in Kontakt steht, angeordnet ist. Von der zweiten Walze 20 mit weicher Oberfläche, beispielsweise einer gummibeschichteten Walze, gelangt das Feuchtmittel über die beispielsweise ebenfalls gummierte Walze 21 auf die zu befeuchtende Druckplatte.For example, only reference is made to the lower right dampening unit 16 within the scope of the present invention. This comprises a spray device 18, in its place one or more brushes or spray nozzles can also be used, for example. With the help of the spray device 18, the dampening solution to be applied, for example water, is sprayed in drop form onto a first roller 19, a so-called distribution cylinder with a hard, metallic surface. The first roller 19 is preferably chrome-plated. The droplets are fed to a further roller 20 which is arranged between the hard roller 19 and the soft dampening solution application roller 21 which is in contact with the plate cylinder 8. From the second roller 20 with a soft surface, for example a rubber-coated roller, the dampening solution reaches the pressure plate to be moistened via the roller 21, which is also rubberized, for example.

Wie bereits erwähnt, wird durch die Verwendung einer Walze mit elastischer Oberfläche zwischen einem Reibzylinder, hier die erste Walze 19 und die weiche Feuchtmittelauftragwalze 21, in überraschender Weise offensichtlich eine «Feinstemul- sion" aus Farbe und Feuchtmittel gebildet, die Ursache für die nicht zu erwarten gewesene problemlose Befeuchtung des Plattenzylinders 8 ist.As already mentioned, the use of a roller with an elastic surface between a distribution cylinder, in this case the first roller 19 and the soft dampening roller 21, makes it more surprising Schender manifestly a "Feinstemul- version" made of ink and dampening solution, the cause for not expected BEEN easy humidification of the plate cylinder. 8

Zusätzlich zu den weichen Walzen der ersten Walze 19 und der Feuchtmittelauftragwalze 21 können noch weitere weiche Walzen angeordnet werden, wenn eine noch höhere Qualität erforderlich ist.In addition to the soft rollers of the first roller 19 and the dampening solution application roller 21, further soft rollers can be arranged if an even higher quality is required.

Claims (3)

1. Device for dampening printing plates in rotary printing machines by spraying or spinning drops of liquid onto a first roller (19) with a hard, dampening-solution-compatible surface, from which the drops pass directly via a second roller (20) with a resilient surface to a dampening-solution-applicator roller (21) with a resilient surface.
2. Device according to claim 1, characterised in that the second roller (20) and the dampening-solution-applicator roller (21) are coated with rubber.
3. Device according to claim 1, characterised in that the first roller (19) is a chromium-plated distributing cylinder.
EP84111153A 1983-10-11 1984-09-19 Device for damping printing plates in rotary printing machines Expired EP0141217B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833336875 DE3336875A1 (en) 1983-10-11 1983-10-11 DEVICE FOR MOISTURIZING PRINTING PLATES IN ROTARY PRINTING MACHINES
DE3336875 1983-10-11

Publications (2)

Publication Number Publication Date
EP0141217A1 EP0141217A1 (en) 1985-05-15
EP0141217B1 true EP0141217B1 (en) 1988-05-11

Family

ID=6211495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111153A Expired EP0141217B1 (en) 1983-10-11 1984-09-19 Device for damping printing plates in rotary printing machines

Country Status (4)

Country Link
US (1) US4558642A (en)
EP (1) EP0141217B1 (en)
JP (1) JPH0686114B2 (en)
DE (2) DE3336875A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526236A1 (en) * 1985-07-23 1987-01-29 Goebel Gmbh Maschf DAMPING
DE4003412A1 (en) * 1990-02-05 1991-08-08 Koenig & Bauer Ag Offset printer - has additional rollers to carry water droplet dampener and increase ink emulsifying
DE4447178A1 (en) * 1994-12-30 1996-07-04 Koenig & Bauer Albert Ag Dampening unit for a printing press
DE19501148A1 (en) * 1995-01-17 1996-07-18 Roland Man Druckmasch Process and dampening system for applying a dampening solution
DE19702364C1 (en) * 1997-01-23 1998-04-23 Windmoeller & Hoelscher Application device for adhesive
DE102004006231B3 (en) * 2004-02-09 2005-08-04 Koenig & Bauer Ag Transporting process for moistener involves increasing surface speed of second roll closer to that of the form cylinder as latter increases

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE439999C (en) * 1924-10-19 1927-01-25 Rota Kessel Und Maschb Ges M B Inclined tube steam boiler with transverse top drums
US2231666A (en) * 1938-05-11 1941-02-11 Michle Printing Press & Mfg Co Dampening mechanism
US2689522A (en) * 1949-10-11 1954-09-21 Addressograph Multigraph Inking and moistening means for rotary planographic printing machines
US3146706A (en) * 1960-11-04 1964-09-01 Dick Co Ab Dampening system for lithographic printing presses
US3508489A (en) * 1969-05-15 1970-04-28 Harris Intertype Corp Fluid applying mechanism
DE2221289C2 (en) * 1972-04-29 1974-01-17 Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg A dampening system for rotary offset printing machines that is arranged separately from an inking system
DE2258321C3 (en) * 1972-11-29 1981-09-17 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Device for moistening printing plates in rotary printing machines
DE2301879A1 (en) * 1973-01-16 1974-07-18 Maschf Augsburg Nuernberg Ag DAMPING UNIT FOR A REVERSIBLE ROTARY OFFSET PRINTING MACHINE
DE2439999B2 (en) * 1974-08-21 1976-12-30 Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg LIQUID APPLICATION DEVICE FOR ROTARY PRINTING MACHINES
GB1488949A (en) * 1975-02-13 1977-10-19 Wood Industries Inc Dampening device for offset printing machine
DE2557199C3 (en) * 1975-09-08 1981-12-10 Wood Industries Inc., Middlesex, N.J. Dampening device for an offset printing machine
DE2544768C2 (en) * 1975-10-07 1983-10-13 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Dampening system for an offset printing machine
ZA776523B (en) * 1977-04-16 1978-08-30 Heidelberger Druckmasch Ag Dampening unit for offset printing presses
US4143596A (en) * 1977-05-04 1979-03-13 Ivett Robert W Lithographic press dampening system
DE7814099U1 (en) * 1978-05-10 1979-05-31 Roland Offsetmaschinenfabrik Faber & Schleicher Ag, 6050 Offenbach MOISTURE DEVICE FOR A PRINTING MACHINE
US4270451A (en) * 1979-04-12 1981-06-02 Frank Perretta Zone controlled dampening means
JPS5874358A (en) * 1981-10-30 1983-05-04 Mitsubishi Heavy Ind Ltd Wetting device for offset printer

Also Published As

Publication number Publication date
DE3336875A1 (en) 1985-04-18
DE3471041D1 (en) 1988-06-16
JPS6097853A (en) 1985-05-31
EP0141217A1 (en) 1985-05-15
JPH0686114B2 (en) 1994-11-02
US4558642A (en) 1985-12-17

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