EP0992346B1 - Damping unit for an offset printing machine - Google Patents

Damping unit for an offset printing machine Download PDF

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Publication number
EP0992346B1
EP0992346B1 EP99118725A EP99118725A EP0992346B1 EP 0992346 B1 EP0992346 B1 EP 0992346B1 EP 99118725 A EP99118725 A EP 99118725A EP 99118725 A EP99118725 A EP 99118725A EP 0992346 B1 EP0992346 B1 EP 0992346B1
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EP
European Patent Office
Prior art keywords
damping
dampening
roller
feed system
ductor
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
Application number
EP99118725A
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German (de)
French (fr)
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EP0992346A1 (en
Inventor
Peter Hummel
Jürgen Schölzig
Ulrich Dr. Jung
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Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Publication of EP0992346A1 publication Critical patent/EP0992346A1/en
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    • 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
    • B41F7/26—Damping devices using transfer rollers

Definitions

  • the invention relates to a dampening system for an offset printing press, that with a plate cylinder carrying a printing form and an inking unit is functionally connected.
  • a dampening unit of this type is known from DD 247 414 A1.
  • the dampening unit has a referred to as a scoop roller, dampening roller.
  • For deposits, such as paint particles, etc., on the dampening roller is to be eliminated over the entire length of the roller
  • a wiper arranged adjacent to the dampening duct.
  • the scraper below the dampening solution level (in the dampening solution tank) to the dampening roller unemployable.
  • the scraper is preferably made of one soft elastic material can be formed.
  • the disadvantage here is that abrasion occurs on the wiper, that can contaminate the dampening solution. Continues to sit down the soft elastic material when used for a long time with color particles too, so the cleaning effect on the roller surface subsides.
  • a dampening roller for a dampening unit which consists of a Base body and a dampening layer arranged on this is formed.
  • the Moisturizing layer has a large number of small hollow spheres, which as a result Grinding treatment on the surface of the roller has broken open.
  • Dampening units for example spray dampening units, described in which the Dampening roller can be used.
  • EP 0638 417 A 1 is a dampening solution circulation system for an offset printing machine described, which is inexpensive, lightweight and space-saving should be.
  • a dampening roller is assigned to a dampening solution feed pipe and underneath the dampening roller there is a collecting plate to take up excess Fountain solution arranged.
  • the invention has for its object a dampening to create the type described above that the above Avoids disadvantages, in particular a stable dampening solution allowed and the deposition of paint particles a dampening roller surface.
  • the task is based on the training features solved by claim 1. Further training results from the subclaims.
  • a first advantage of the invention is based on the fact that the build-up of ink particles on the roller surfaces of the dampening unit rollers is avoided without the mechanical action of a scraper.
  • a pressurized flow onto the corresponding roller surface using a dampening solution achieves a cleaning effect on the roller surface or prevents the build-up of ink particles.
  • the dampening solution which is required anyway in the dampening solution container can simultaneously be used to prevent or reduce the ink degradation on the roller surfaces.
  • at least one first and / or at least one second supply system for dampening solution is assigned to the dampening solution container, which supply dampening solution onto the roller surface of a dampening roller.
  • the first and / or second feed system each have a plurality of spray openings arranged parallel to the dampening duct.
  • the first feed system is directed in the direction of rotation of the dampening roller onto its roller surface (positive spray nozzles).
  • the second feed system with a corresponding number of spray openings opposite the direction of rotation of the dampening roller - in mirror image of the first feeding system - with a corresponding number of spray openings against the direction of rotation of the dampening roller is directed onto the roll surface (negative spray nozzles).
  • the dampening solution can be supplied to the dampening solution container and that a separate dampening solution supply is not necessary.
  • the fountain solution container can be known Way with a dampening solution inlet and a dampening solution outlet and additionally with one or both feeding systems be trained.
  • a plate cylinder in contact with a blanket cylinder 2 1 is in active connection with a dampening unit 4.
  • An inking unit 3 assigned to the plate cylinder 1 consists of several inking rollers 11, the rollers with ink supply (not designated further) are connected.
  • the dampening unit 4 is - viewed in the direction of rotation of the plate cylinder 1 - the Inking unit 3 upstream and exists in the present example from a dampening solution tank 8, a dampening roller 6, one Dampening roller 7 and a dampening roller 5 8 and dampening roller 6 form a dampening solution supply device 12 for the dampening roller 5.
  • the dampening roller 5 is a first rider roller 9 in Contact assigned, this first rider roller 9 after the Contact point of dampening roller 5 / plate cylinder 1 downstream of the dampening roller 5 in the direction of rotation is. In the present example, this is at the same time as Bridge roller switchable arranged by the first rider roller 9 with the first in the direction of rotation of the plate cylinder 1 Ink roller 11 of the inking unit 3 can be brought into contact.
  • This switching position of the roller 9, represented by Dashed line is preferred for coupling the dampening unit 4 used with the inking unit 3 for washing the rollers. alternative this switch position can be used in printing mode.
  • the Dampening roller 5 is in the direction of rotation after the first rider roll 9 further a second rider roll 10 in Subsequent contact to dampening roller 5.
  • the rider rolls 9 and 10 are with an axially acting traversing stroke coupled.
  • At least one first feed system 13 is provided to the dampening duct 6 assigned for dampening solution in the axial direction.
  • the feed system 13 has a Majority of spray nozzles.
  • the spray nozzles are as bores, Slits or insertable nozzles preferably on the roller surface of the dampening duct 6 directed.
  • the Spray nozzles of the feed system 13 preferably in the direction of rotation of the Moisturizer 6 directed on the roller surface.
  • the Feed system 13 is preferably with a dampening solution supply, e.g. a dampening solution circulation system.
  • the feed system 13 can be acted on with dampening solution, such that preferably the roller surface of the dampening roller 6 is flowable with dampening solution in the direction of rotation.
  • At least one second feed system 14 is for Fountain solution assigned to dampening roller 6 in the axial direction, which is designed analogously to the first feed system 13.
  • the spray nozzles are in turn preferred on the roller surface the dampening duct 6 directed, but preferably counter the direction of rotation of the dampening duct 6.
  • the second feeding system is again preferred with a dampening solution supply coupled and can be loaded with dampening solution, such that preferably the roller surface of the dampening roller 6, preferably against the direction of rotation, with dampening solution is flowable.
  • the first and the second feed system 13, 14 the Assigned to dampening duct 6.
  • the second feed system 14 opposite the first feed system 13 in mirror image arranged with the spray nozzles.
  • the feed systems 13, 14 are below and / or above the maximum dampening solution level preferably in the dampening solution tank 8 arranged.
  • the feed systems 13, 14 are connected in series with a function of a dampening solution supply.
  • the feeding systems are in a further training 13, 14 in parallel with a dampening solution supply in functional connection.
  • the dampening duct 6 In printing operation, the are continuously or periodically Feed systems 13, 14 acted on by dampening solution, the Dampening solution flows onto the roller surface of the dampening roller 6. The deposition of paint particles becomes noticeable avoided. The return of the paint particles to the dampening roller 6 is reduced or existing color particles are removed from the Moisturizer 6 removed and with the dampening solution return dissipated, the dampening solution is in turn processed and fed again to the feed devices 13, 14. In printing operation the dampening duct 6 is always rotating.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

The wetting feed for an offset printing press has a doctor roller (6) with a liquid feed mounted in the axial direction and with multiple spray nozzles mounted along the roller length. The liquid is fed along the feed and sprayed onto the roller.

Description

Die Erfindung betrifft ein Feuchtwerk für eine Offsetdruckmaschine, das mit einem eine Druckform tragenden Plattenzylinder und einem Farbwerk in Funktionsverbindung ist.The invention relates to a dampening system for an offset printing press, that with a plate cylinder carrying a printing form and an inking unit is functionally connected.

[Stand der Technik][State of the art]

Ein Feuchtwerk dieser Art ist aus DD 247 414 A1 bekannt. Das Feuchtwerk weist eine in einen Feuchtmittelbehälter eintauchende, als Schöpfwalze bezeichnete, Feuchtduktorwalze auf. Um Ablagerungen, wie Farbpartikel usw., auf der Feuchtduktorwalze zu beseitigen, ist über die gesamte Walzenlänge des Feuchtduktors ein anliegender Abstreifer angeordnet. In einer weiteren Ausbildung ist der Abstreifer unterhalb des Feuchtmittelspiegels (im Feuchtmittelbehälter) an den Feuchtduktor anstellbar. Dabei ist der Abstreifer bevorzugt aus einem weichelastischen Material ausbildbar.A dampening unit of this type is known from DD 247 414 A1. The The dampening unit has a referred to as a scoop roller, dampening roller. For deposits, such as paint particles, etc., on the dampening roller is to be eliminated over the entire length of the roller A wiper arranged adjacent to the dampening duct. In a further training is the scraper below the dampening solution level (in the dampening solution tank) to the dampening roller unemployable. The scraper is preferably made of one soft elastic material can be formed.

Von Nachteil ist hierbei, daß am Abstreifer Abrieb entsteht, der das Feuchtmittel verunreinigen kann. Weiterhin setzt sich das weichelastische Material bei längerem Einsatz mit Farbpartikel zu, so daß der Reinigungseffekt auf der Walzenoberfläche nachläßt.The disadvantage here is that abrasion occurs on the wiper, that can contaminate the dampening solution. Continues to sit down the soft elastic material when used for a long time with color particles too, so the cleaning effect on the roller surface subsides.

Aus EP-A-0371 386 ist eine Feuchtwalze für ein Feuchtwerk bekannt, die aus einem Grundkörper und einer auf diesem angeordnteten Befeuchtungsschicht gebildet ist. Die Befeuchtungsschicht weist eine Vielzahl kleiner Hohlkugeln auf, welche in Folge einer Schleifbehandlung an der Walzenmantelfläche aufgebrochen sind. Weiterhin sind verschiedene Feuchtwerke, beispielsweise Sprühfeuchtwerke, beschrieben, in denen die Feuchtwalze einsetzbar ist.From EP-A-0371 386 a dampening roller for a dampening unit is known, which consists of a Base body and a dampening layer arranged on this is formed. The Moisturizing layer has a large number of small hollow spheres, which as a result Grinding treatment on the surface of the roller has broken open. Furthermore, there are several Dampening units, for example spray dampening units, described in which the Dampening roller can be used.

Gemäß EP 0638 417 A 1 ist ein Feuchtmittelumlaufsystem für eine Offsetdruckmaschine beschrieben, welches kostengünstig in Leichtbauweise und platzsparend ausgebildet sein soll. In einer Ausbildung ist eine Feuchtwalze ein Feuchtmittelszuführrohr zugeordnet und unterhalb der Feuchtwalze ist ein Auffangblech zur Aufnahme von überschüßigem Feuchtmittel angeordnet.According to EP 0638 417 A 1 is a dampening solution circulation system for an offset printing machine described, which is inexpensive, lightweight and space-saving should be. In one embodiment, a dampening roller is assigned to a dampening solution feed pipe and underneath the dampening roller there is a collecting plate to take up excess Fountain solution arranged.

[Aufgabe der Erfindung]OBJECT OF THE INVENTION

Der Erfindung liegt die Aufgabe zugrunde, ein Feuchtwerk der eingangs beschriebenen Art zu schaffen, daß die genannten Nachteile vermeidet, das insbesondere eine stabile Feuchtmittelführung gestattet und das Ablagern von Farbpartikeln auf einer Feuchtwerkswalzenoberfläche vermeidet. The invention has for its object a dampening to create the type described above that the above Avoids disadvantages, in particular a stable dampening solution allowed and the deposition of paint particles a dampening roller surface.

Erfindungsgemäß wird die Aufgabe durch die Ausbildungsmerkmale von Anspruch 1 gelöst. Weiterbildungen ergeben sich aus den Unteransprüchen.According to the invention, the task is based on the training features solved by claim 1. Further training results from the subclaims.

Ein erster Vorteil der Erfindung ist dadurch begründet, daß der Aufbau von Farbpartikeln auf den Walzenoberflächen der Feuchtwerkswalzen ohne mechanische Einwirkung eines Abstreifers vermieden wird. Durch eine druckbeaufschlagte Anströmung der entsprechenden Walzenoberfläche mittels Feuchtmittel wird ein Reinigungseffekt auf der Walzenoberfläche erzielt bzw. der Aufbau von Farbpartikeln verhindert.
Weiterhin ist es vorteilhaft, daß ohnehin im Feuchtmittelbehälter erforderliches Feuchtmittel gleichzeitig zur Verhinderung bzw. Reduzierung des Farbabbaues auf den Walzenoberflächen einsetzbar ist.
Ebenso ist von Vorteil, daß dem Feuchtmittelbehälter zumindest ein erstes und/oder zumindest ein zweites Zuführsystem für Feuchtmittel zugeordnet ist, welche Feuchtmittel auf die Walzenoberfläche eines Feuchtduktors zuführen. Das erste und/oder zweite Zuführsystem weist jeweils eine Mehrzahl von parallel zum Feuchtduktor angeordnete Sprühöffnungen auf.
Hierbei ist das erste Zuführsystem in Drehrichtung des Feuchtduktors auf dessen Walzenoberfläche gerichtet (positiv angestellte Sprühdüsen). Alternativ ist das zweite Zuführsystem mit einer entsprechenden Mehrzahl von Sprühöffnungen entgegen der Drehrichtung des Feuchtduktors - spiegelbildlich zum ersten Zuführsystem - mit einer entsprechenden Anzahl von Sprühöffnungen entgegen der Drehrichtung des Feuchtduktors auf die Walzenoberfläche gerichtet (negativ angestellte Sprühdüsen).
Schließlich ist es von Vorteil, daß bevorzugt mittels des ersten und/oder zweiten Zuführsystems die Feuchtmittelbelieferung des Feuchtmittelbehälters realisierbar ist und ein separater Feuchtmittelzulauf hinfällig ist. A first advantage of the invention is based on the fact that the build-up of ink particles on the roller surfaces of the dampening unit rollers is avoided without the mechanical action of a scraper. A pressurized flow onto the corresponding roller surface using a dampening solution achieves a cleaning effect on the roller surface or prevents the build-up of ink particles.
Furthermore, it is advantageous that the dampening solution which is required anyway in the dampening solution container can simultaneously be used to prevent or reduce the ink degradation on the roller surfaces.
It is also advantageous that at least one first and / or at least one second supply system for dampening solution is assigned to the dampening solution container, which supply dampening solution onto the roller surface of a dampening roller. The first and / or second feed system each have a plurality of spray openings arranged parallel to the dampening duct.
Here, the first feed system is directed in the direction of rotation of the dampening roller onto its roller surface (positive spray nozzles). Alternatively, the second feed system with a corresponding number of spray openings opposite the direction of rotation of the dampening roller - in mirror image of the first feeding system - with a corresponding number of spray openings against the direction of rotation of the dampening roller is directed onto the roll surface (negative spray nozzles).
Finally, it is advantageous that, preferably by means of the first and / or second supply system, the dampening solution can be supplied to the dampening solution container and that a separate dampening solution supply is not necessary.

Darüber hinaus kann der Feuchtmittelbehälter in bekannter Weise mit einem Feuchtmittelzulauf und einem Feuchmittelablauf und zusätzlich mit einer oder beiden Zuführsystemen ausgebildet sein.In addition, the fountain solution container can be known Way with a dampening solution inlet and a dampening solution outlet and additionally with one or both feeding systems be trained.

[Beispiele][Examples]

Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail using an exemplary embodiment become.

Dabei zeigen schematisch:

Fig. 1
ein Offsetdruckwerk mit einem Farbwerk und einem Feuchtwerk,
Fig. 2
ein Feuchtwerk in erfindungsgemäßer Ausbildung.
The following schematically show:
Fig. 1
an offset printing unit with an inking unit and a dampening unit,
Fig. 2
a dampening system in training according to the invention.

Ein mit einem Gummituchzylinder 2 in Kontakt stehender Plattenzylinder 1 ist mit einem Feuchtwerk 4 in Wirkverbindung. Ein dem Plattenzylinder 1 zugeordnetes Farbwerk 3 besteht aus mehreren Farbauftragwalzen 11, die mit farbzuführenden Walzen (nicht weiter bezeichnet)verbunden sind. Das Feuchtwerk 4 ist - in Drehrichtung des Plattenzylinders 1 betrachtet - dem Farbwerk 3 vorgeordnet und besteht im vorliegenden Beispiel aus einem Feuchtmittelbehälter 8, einem Feuchtduktor 6, einer Feuchtdosierwalze 7 und einer Feuchtauftragwalze 5. Feuchtmittelbehälter 8 und Feuchtduktor 6 bilden eine Feuchtmittelzuführeinrichtung 12 für die Feuchtauftragwalze 5.A plate cylinder in contact with a blanket cylinder 2 1 is in active connection with a dampening unit 4. An inking unit 3 assigned to the plate cylinder 1 consists of several inking rollers 11, the rollers with ink supply (not designated further) are connected. The dampening unit 4 is - viewed in the direction of rotation of the plate cylinder 1 - the Inking unit 3 upstream and exists in the present example from a dampening solution tank 8, a dampening roller 6, one Dampening roller 7 and a dampening roller 5 8 and dampening roller 6 form a dampening solution supply device 12 for the dampening roller 5.

Der Feuchtauftragwalze 5 ist eine erste Reiterwalze 9 in Kontakt zugeordnet, wobei diese erste Reiterwalze 9 nach der Kontaktstelle von Feuchtauftragwalze 5 / Plattenzylinder 1 der Feuchtauftragwalze 5 in deren Drehrichtung nachgeordnet ist. Im vorliegenden Beispiel ist diese gleichzeitig als Brückenwalze schaltbar angeordnet, indem die erste Reiterwalze 9 mit der in Drehrichtung des Plattenzylinders 1 ersten Farbauftragwalze 11 des Farbwerkes 3 in Kontakt bringbar ist. Diese Schaltstellung der Walze 9, dargestellt mittels Strichlinie, wird bevorzugt zur Kopplung des Feuchtwerkes 4 mit dem Farbwerk 3 zum Waschen der Walzen benutzt. Alternativ ist diese Schaltstellung im Druckbetrieb einsetzbar. Der Feuchtauftragwalze 5 ist in deren Drehrichtung nach der ersten Reiterwalze 9 weiterhin eine zweite Reiterwalze 10 in Kontakt zur Feuchtauftragwalze 5 nachgeordnet. Die Reiterwalzen 9 und 10 sind mit einem axial wirkenden Changierhub gekoppelt.The dampening roller 5 is a first rider roller 9 in Contact assigned, this first rider roller 9 after the Contact point of dampening roller 5 / plate cylinder 1 downstream of the dampening roller 5 in the direction of rotation is. In the present example, this is at the same time as Bridge roller switchable arranged by the first rider roller 9 with the first in the direction of rotation of the plate cylinder 1 Ink roller 11 of the inking unit 3 can be brought into contact. This switching position of the roller 9, represented by Dashed line is preferred for coupling the dampening unit 4 used with the inking unit 3 for washing the rollers. alternative this switch position can be used in printing mode. The Dampening roller 5 is in the direction of rotation after the first rider roll 9 further a second rider roll 10 in Subsequent contact to dampening roller 5. The rider rolls 9 and 10 are with an axially acting traversing stroke coupled.

Dem Feuchtduktor 6 ist wenigstens ein erstes Zuführsystem 13 für Feuchtmittel in Achsrichtung zugeordnet. Über die Walzenlänge des Feuchtduktors 6 weist das Zuführsystem 13 eine Mehrzahl von Sprühdüsen auf. Die Sprühdüsen sind als Bohrungen, Schlitze oder einsetzbare Düsen bevorzugt auf die Walzenoberfläche des Feuchtduktors 6 gerichtet. Hierbei sind die Sprühdüsen des Zuführsystems 13 bevorzugt in Drehrichtung des Feuchtduktors 6 auf dessen Walzenoberfläche gerichtet. Das Zuführsystem 13 ist vorzugsweise mit einer Feuchtmittelversorgung, z.B. einem Feuchtmittelkreislaufsystem, gekoppelt. Das Zuführsystem 13 ist mit Feuchtmittel beaufschlagbar, derart, daß bevorzugt die Walzenoberfläche des Feuchtduktors 6 in Drehrichtung mit Feuchtmittel anströmbar ist.At least one first feed system 13 is provided to the dampening duct 6 assigned for dampening solution in the axial direction. Over the roll length of the dampening duct 6, the feed system 13 has a Majority of spray nozzles. The spray nozzles are as bores, Slits or insertable nozzles preferably on the roller surface of the dampening duct 6 directed. Here are the Spray nozzles of the feed system 13 preferably in the direction of rotation of the Moisturizer 6 directed on the roller surface. The Feed system 13 is preferably with a dampening solution supply, e.g. a dampening solution circulation system. The feed system 13 can be acted on with dampening solution, such that preferably the roller surface of the dampening roller 6 is flowable with dampening solution in the direction of rotation.

Alternativ ist zumindest ein zweites Zuführsystem 14 für Feuchtmittel in Achsrichtung dem Feuchtduktor 6 zugeordnet, welches analog zum ersten Zuführsystem 13 ausgebildet ist. Die Sprühdüsen sind wiederum bevorzugt auf die Walzenoberfläche des Feuchtduktors 6 gerichtet, jedoch bevorzugt entgegen der Drehrichtung des Feuchtduktors 6. Das zweite Zuführsystem ist wiederum bevorzugt mit einer Feuchtmittelversorgung gekoppelt und ist mit Feuchtmittel beaufschlagbar, derart, daß bevorzugt die Walzenoberfläche des Feuchtduktors 6, bevorzugt entgegen dessen Drehrichtung, mit Feuchtmittel anströmbar ist.Alternatively, at least one second feed system 14 is for Fountain solution assigned to dampening roller 6 in the axial direction, which is designed analogously to the first feed system 13. The spray nozzles are in turn preferred on the roller surface the dampening duct 6 directed, but preferably counter the direction of rotation of the dampening duct 6. The second feeding system is again preferred with a dampening solution supply coupled and can be loaded with dampening solution, such that preferably the roller surface of the dampening roller 6, preferably against the direction of rotation, with dampening solution is flowable.

Neben der beschriebenen Einzelanordnung sind in einer Weiterbildung das erste sowie das zweite Zuführsystem 13, 14 dem Feuchtduktor 6 zugeordnet. Hierbei ist das zweite Zuführsystem 14 zum ersten Zuführsystem 13 spiegelbildlich gegenüberliegend mit den Sprühdüsen angeordnet. In einfacher Ausbildung sind die Zuführsysteme 13, 14 rohrförmig ausgeführt und weisen eine separate oder gemeinsame Feuchtmittelversorgung auf.In addition to the individual arrangement described are in a training the first and the second feed system 13, 14 the Assigned to dampening duct 6. Here is the second feed system 14 opposite the first feed system 13 in mirror image arranged with the spray nozzles. In simple training are the feed systems 13, 14 tubular and have a separate or shared fountain solution supply on.

Die Zuführsysteme 13, 14 sind dabei unterhalb und/oder oberhalb des maximalen Feuchtmittelniveaus bevorzugt im Feuchtmittelbehälter 8 angeordnet.The feed systems 13, 14 are below and / or above the maximum dampening solution level preferably in the dampening solution tank 8 arranged.

In einer Ausbildung sind die Zuführsysteme 13, 14 in Reihenschaltung mit einer Feuchtmittelversorgung in Funktionsverbindung. In einer weiteren Ausbildung sind die Zuführsysteme 13, 14 in Parallelschaltung mit einer Feuchtmittelversorgung in Funktionsverbindung.In one embodiment, the feed systems 13, 14 are connected in series with a function of a dampening solution supply. The feeding systems are in a further training 13, 14 in parallel with a dampening solution supply in functional connection.

Im Druckbetrieb bildet sich - abhängig vom Sujet - nach der Kontaktstelle von Feuchtauftragwalze 5 / Plattenzylinder 1 auf der Feuchtauftragwalze 5 eine Struktur von Feuchtmittel und Farbe aus. Durch die Reiterwalzen 9, 10 wird diese Struktur zerstört, wobei ein Rücktransport von Druckfarbe in das Feuchtwerk 4, speziell die Feuchtmittelzuführeinrichtung 12, auftreten kann. Je nach vorliegender Walzengeometrie, Oberflächenbeschaffenheit (Struktur, Rauheit) und/oder nach eingesetztem Walzenwerkstoff (z.B. Chrom, Keramik) des Feuchtduktors 6 und/oder Art der eingesetzten Druckfarbe können Farbablagerungen auf dem Feuchtduktor 6 selbst und/oder den benachbarten Walzen, z.B. der Feuchtdosierwalze 7, auftreten. Diese Farbablagerungen können die Druckqualität beeinträchtigen.In print mode - depending on the subject - forms after the Contact point of dampening roller 5 / plate cylinder 1 on the dampening roller 5, a structure of dampening solution and color out. By the rider rolls 9, 10 this structure destroyed, with a return transport of ink in the Dampening unit 4, specifically the dampening solution supply device 12, can occur. Depending on the existing roller geometry, surface quality (Structure, roughness) and / or after used roller material (e.g. chrome, ceramic) of the Moisture ductor 6 and / or the type of printing ink used can paint deposits on the dampening roller 6 itself and / or the adjacent rollers, e.g. the dampening roller 7, occur. These color deposits can affect print quality affect.

Im Druckbetrieb werden kontinuierlich oder periodisch die Zuführsysteme 13, 14 mit Feuchtmittel beaufschlagt, wobei das Feuchtmittel die Walzenoberfläche des Feuchtduktors 6 anströmt. Damit wird die Ablagerung von Farbpartikeln spürbar vermieden. Der Rücktransport der Farbpartikel zum Feuchtduktor 6 wird reduziert bzw. vorhandene Farbpartikel werden vom Feuchtduktor 6 abgetragen und mit dem Feuchtmittelrücklauf abgeführt, das Feuchtmittel wird wiederum aufbereitet und erneut den Zuführeinrichtungen 13, 14 zugeführt. Im Druckbetrieb ist der Feuchtduktor 6 stets in Drehbewegung. In printing operation, the are continuously or periodically Feed systems 13, 14 acted on by dampening solution, the Dampening solution flows onto the roller surface of the dampening roller 6. The deposition of paint particles becomes noticeable avoided. The return of the paint particles to the dampening roller 6 is reduced or existing color particles are removed from the Moisturizer 6 removed and with the dampening solution return dissipated, the dampening solution is in turn processed and fed again to the feed devices 13, 14. In printing operation the dampening duct 6 is always rotating.

[Bezugszeichenliste][REFERENCE LIST]

11
Plattenzylinderplate cylinder
22
GummituchzylinderBlanket cylinder
33
Farbwerkinking
44
Feuchtwerkdampening
55
FeuchtauftragwalzeDampener roller
66
Feuchtduktordampening ductor
77
FeuchtdosierwalzeFeuchtdosierwalze
88th
FeuchtmittelbehälterDampening solution container
99
erste Reiterwalzefirst rider roll
1010
zweite Reiterwalzesecond rider roller
1111
FarbauftragwalzeInking roller
1212
FeuchtmittelzuführeinrichtungFeuchtmittelzuführeinrichtung
1313
erstes Zuführsystemfirst feeding system
1414
zweites Zuführsystemsecond feed system

Claims (7)

  1. Damping unit (4) for an offset printing press with a damping ductor (6) dipping into the damping agent of a damping agent container (8) and at least one damping applicator roller (5), a plate cylinder (1) carrying a printing forme and an inking unit (3), characterised in that fitted to the damping ductor (6) in the axial direction is at least a first feed system (13) which has over the roller length a plurality of spray nozzles, that the feed system (13) can be subjected to damping agent and the roller surface of the damping ductor (6) can be subject to flow with damping agent from spray openings of the spray nozzles.
  2. Damping unit according to Claim 1, characterised in that the spray nozzles of the first feed system (13) are arranged in the direction of rotation of the damping ductor (6).
  3. Damping unit according to Claim 1, characterised in that the second feed system (14) is fitted in the axial direction to the damping ductor (6), which has in the length of the roller a plurality of spray nozzles, that the feed system (14) can be subjected to damping agent and the roller surface of the damping ductor (6) can be subject to flow over with damping agent.
  4. Damping unit according to Claim 3, characterised in that the spray nozzles of the second feed system (14) are arranged counter to the direction of rotation of the damping ductor (6).
  5. Damping unit according to Claim 1 and 2, characterised in that the feed systems (13, 14) are arranged below and/or above the maximum damping agent level in the damping agent container (8).
  6. Damping unit according to at least Claims 1 and 2, characterised in that the feed systems (13, 14) are linked in series circuit with the damping agent supply.
  7. Damping unit according to at least Claims 1 and 2, characterised in that the feed systems (13, 14) are linked in parallel circuit with the damping agent supply.
EP99118725A 1998-10-10 1999-09-22 Damping unit for an offset printing machine Expired - Lifetime EP0992346B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853362A DE19853362C5 (en) 1998-10-10 1998-10-10 Dampening unit for an offset printing machine
DE19853362 1998-10-10

Publications (2)

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EP0992346A1 EP0992346A1 (en) 2000-04-12
EP0992346B1 true EP0992346B1 (en) 2002-11-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99118725A Expired - Lifetime EP0992346B1 (en) 1998-10-10 1999-09-22 Damping unit for an offset printing machine

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EP (1) EP0992346B1 (en)
AT (1) ATE227216T1 (en)
DE (2) DE19853362C5 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10222294A1 (en) 2002-05-18 2003-12-04 Koenig & Bauer Ag Dampening unit with dampening solution supply and return device
DE10242995B4 (en) * 2002-09-17 2006-09-07 Koenig & Bauer Ag Dampening for a printing press

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD247414A1 (en) * 1986-04-01 1987-07-08 Polygraph Leipzig SPREADING DEVICE ON A HUMIDIFIER PANEL OF OFFSET PRESSURE MACHINES
JPH0720741B2 (en) * 1988-11-28 1995-03-08 株式会社東京機械製作所 Damping roller, dampening roller manufacturing method and dampening water supply device for printing machine
JP2906951B2 (en) * 1993-08-11 1999-06-21 ボールドウィン アジア パシフィック コーポレーション Offset printing machine dampening water supply device
DE19616198A1 (en) * 1996-04-23 1997-10-30 Bse Printtechnologie Ag Offset printing machine damping unit

Also Published As

Publication number Publication date
ATE227216T1 (en) 2002-11-15
DE19853362C5 (en) 2004-03-04
DE19853362C1 (en) 2000-02-03
EP0992346A1 (en) 2000-04-12
DE59903303D1 (en) 2002-12-12

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