EP1097812B1 - Device and method for dampening a component in a printing machine - Google Patents

Device and method for dampening a component in a printing machine Download PDF

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Publication number
EP1097812B1
EP1097812B1 EP00121915A EP00121915A EP1097812B1 EP 1097812 B1 EP1097812 B1 EP 1097812B1 EP 00121915 A EP00121915 A EP 00121915A EP 00121915 A EP00121915 A EP 00121915A EP 1097812 B1 EP1097812 B1 EP 1097812B1
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EP
European Patent Office
Prior art keywords
dampening solution
jet
dampening
pressure
printing machine
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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
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EP00121915A
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German (de)
French (fr)
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EP1097812A2 (en
EP1097812A3 (en
Inventor
Raymond Hildreth Spooner
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Goss International Americas LLC
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Goss International Americas LLC
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Publication of EP1097812A2 publication Critical patent/EP1097812A2/en
Publication of EP1097812A3 publication Critical patent/EP1097812A3/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F7/00Rotary lithographic machines
    • B41F7/20Details
    • B41F7/24Damping devices
    • B41F7/30Damping devices using spraying elements

Definitions

  • the present invention relates to a method for moistening a component in a printing machine, in particular a plate cylinder, according to claim 1.
  • the present invention relates to a printing machine according to claim 9.
  • dampening units are used to moisten the rollers and cylinders, by means of which a dyed image is transferred to a substrate web or sheet.
  • a fountain solution eg. As water or mixed with water other liquid transferred to one or more rollers or cylinders.
  • dampening solution there are two types of transfer of dampening solution to the rollers or cylinders of a printing press, of which at least one application is usually found:
  • the fountain solution can be sprayed either in the form of tiny drops directly on one of the rollers or one of the cylinders of the printing press, or the dampening solution is transferred to one of the rollers or one of the cylinders via a dampening train.
  • a dampening train consists of a series of juxtaposed rollers which transfer the dampening solution respectively to the subsequent roller and finally to the desired printing cylinder.
  • the dampening solution is sprayed either in the form of tiny drops on one of the rollers of the dampening train or taken up by a partially immersed in dampening solution, rotating in the fountain solution tank roller. Dampening rollers are often expensive and maintenance-intensive due to the number of rollers required to disperse and transfer the dampening solution.
  • the invention provides a method and a printing machine, by means of which or which the fountain solution, preferably in the form of substantially continuous dampening high-density radiation onto a component, eg. As a roller or a cylinder is transmitted.
  • the term "continuous jet” refers to a uniform, preferably vortex-free liquid jet which produces a minimum number of individual drops of fountain solution.
  • the fountain solution is not or only minimally in the form of drops.
  • the high-density continuous jets of the invention impinge on the roller or cylinder and the fountain solution spreads on the surface of the roller or cylinder by spreading radially on the surface of the roller or cylinder from the application point of the jet and forms puddles, so to speak.
  • Each of the continuous jets is produced by a jet orifice, preferably a nozzle or micro nozzle, through which the dampening solution exits at a suitable pressure of the dampening solution in the form of a continuous, relatively uniform, preferably laminar jet.
  • a pressure distributor is preferably provided, along which a number of spaced jet diaphragms are preferably arranged in such a way that a series of continuous jets is produced along the length of the roller to be moistened.
  • the jet apertures are preferably designed as micro-nozzles, and the pressure of the fountain solution is preferably adjustable via control valves.
  • the uniform jets emerging from the jet apertures which are distributed in the form of fountain solution puddles on the roll surface, allow a uniform distribution of dampening solution over the entire length of the roll or cylinder surface.
  • the present invention increases the print quality by avoiding fluctuations in print quality caused by variations in the amount of fountain solution along the roll surface.
  • Figs. 1 to 3 show a pressure distributor 1 according to an embodiment of the present invention.
  • the pressure distributor 1 according to the invention comprises a dampening solution inlet line 5, preferably running along the length of the pressure distributor 1, which is preferably connected to a container D containing pressurized dampening solution.
  • a bolt 7 may be provided to close one end of the inlet pipe 5.
  • the pressure distributor 1 is supplied with pressurized dampening solution with which a roller or a cylinder is to be moistened in a printing press.
  • a series of outlet lines 9 extend through a wall of the pressure distributor 1.
  • the outlet lines 9 connect the interior of the inlet line 5 to one of a series of control valves 6 arranged on the pressure distributor 1.
  • the outlet lines 9 accordingly supply pressurized dampening solution to the control valves 6.
  • the control valves 6 may be formed as any valve capable of controlling a flow of liquid.
  • the control valves 6 are controlled by any known control unit 10, for example a pneumatic or hydraulic control console, an electronic microprocessor or other electronic control unit.
  • the control unit 10 sends via lines 11 signals to each one of the control valves 6 and controls in this way the opening and closing and the degree of opening or closing of the control valves 6.
  • the control valves 6 control the Feuchtffenzul from the inlet line 5 to further inlet openings 8, each leading to a pressure chamber 4 a plurality of arranged along the length of the pressure manifold 1 pressure chambers 4.
  • the control valves 6 accordingly regulate the pressure in each of the pressure chambers 4.
  • Each of the pressure chambers 4 directs fountain solution to a group of spaced across the width of the pressure distributor 1 arranged jet aperture 3.
  • the jet aperture 3 are arranged at a distance d to each other and each produce a continuous dampening solution Beam 9 emerging from the beam apertures 3 and impinging on a roller or a cylinder, for example a plate cylinder P.
  • the jet apertures 3 are preferably designed as micro-nozzles, ie as nozzles with a very small opening. They can be incorporated directly into one side of the pressure distributor 1, z. B. drilled, be or form a separately prepared component which is inserted into an opening formed in the side of the pressure distributor 1. As will be explained in more detail below, the size of the beam aperture 3 is selected such that the beam aperture in a pressure of the fountain solution, as it is generated in the pressure chambers 4 by the control valves 6, a continuous dampening jet 8 of high density and in particular produce a consisting of a substantially laminar flow beam.
  • the pressure in the pressure chambers 4 can be controlled to move within a suitable range in which a substantially laminar flow from the jet apertures 3 exit, all of a given size.
  • the pressure in the pressure chambers 4 is regulated via the control valves 6, which in turn are controlled by the control unit 10.
  • a pressure gauge (not shown) in the pressure chambers 4 may be used to ensure that the pressure in the pressure chambers 4 moves within the appropriate range, so that continuous Rays out of the beam aperture 3 of predetermined size.
  • the pressure in the pressure chambers 4 can be regulated by the control unit, so that the flow rate can be changed.
  • the flow rate can be varied in this way and adapted to different conditions when more or less dampening solution is needed on a roller or a cylinder in the printing press.
  • the pressure distributor 1 according to the invention is shown in a position in which the rotating in the direction R plate cylinder P is moistened, which transmits in an offset printing press on a blanket cylinder B color.
  • the pressure distributor 1 is oriented so as to transfer dampening means in the form of continuous high-density jets to the surface of the plate cylinder P.
  • the flow rate and the speed of the beams emerging from the jet aperture 3 can be varied in such a way that different beam profiles S 1 (low flow rate), S 2 (average flow rate) or S 3 (high Flow rate) are generated.
  • the flow capacity of the jet aperture 3 is regulated by the control valves 6 for each pressure chamber 4.
  • the different flow rates control the Degree of moistening of the surface of the plate cylinder P.
  • the degree of moistening of the plate cylinder P can be regulated while at the same time ensuring that the pressure distributor 1 and the jet diaphragms 3 generate continuous jets.
  • the jet apertures 3 are arranged at a distance from one another in such a way that the continuous rays S produced by them effect a uniform distribution of the fountain solution on the surface of the roll to be moistened or of the cylinder to be moistened.
  • Fig. 5 it is shown how the dampening solution is applied to the surface of the plate cylinder P.
  • the continuous rays S which are shown in cross section at their point of impact on the plate cylinder P, are distributed in the form of puddles, which propagate in the directions indicated by the arrows.
  • the dampening solution of one jet S flows together with the dampening solution of the adjacent continuous jet S in a cutting region I.
  • the distance d is chosen in such a way that the distributing fountain solution flows together with the different possible flow rates of the jet aperture 3 with the distributing dampening solution of the adjacent jet S without gaps.
  • the impingement point of the continuous jet S in the downstream direction region of the fountain solution forms a moistening layer L, which extends over the entire length of the plate cylinder P and in this way the plate cylinder evenly moistened.

Abstract

The humidifier comprises a pressure chamber (4) containing humidifying agent. At least one jet-screen (3) in the form of an especially micro-nozzle, produces a continuous jet of humidifying agent (S) directed at the component. The screen is connected to the pressure chamber. The at least one control valve (6) controlled by a control unit, regulates the pressure of the humidifying agent in the at least one pressure chamber. A monitor unit monitors the pressure of the humidifying agent.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Befeuchten eines Bauteils in einer Druckmaschine, insbesondere eines Plattenzylinders, gemäß Anspruch 1.The present invention relates to a method for moistening a component in a printing machine, in particular a plate cylinder, according to claim 1.

Weiterhin betrifft die vorliegende Erfindung eine Druckmaschine, gemäß dem Anspruch 9.Furthermore, the present invention relates to a printing machine according to claim 9.

Im Offsetdruck werden Feuchtwerke zum Befeuchten der Walzen und Zylinder eingesetzt, mittels derer ein eingefärbtes Bild auf eine Bedruckstoffbahn oder einen -bogen übertragen wird. In der Regel wird zur Gewährleistung einer korrekten Übertragung des Bildes auf den Bedruckstoff ein Feuchtmittel, z. B. Wasser oder eine mit Wasser gemischte andere Flüssigkeit, auf eine oder mehrere Walzen oder Zylinder übertragen.In offset printing, dampening units are used to moisten the rollers and cylinders, by means of which a dyed image is transferred to a substrate web or sheet. In general, to ensure a correct transfer of the image on the substrate a fountain solution, eg. As water or mixed with water other liquid transferred to one or more rollers or cylinders.

Grundsätzlich gibt es zwei Arten der Übertragung von Feuchtmittel auf die Walzen oder Zylinder einer Druckmaschine, von denen in der Regel mindestens eine Anwendung findet: Das Feuchtmittel kann entweder in Form von winzigen Tropfen direkt auf eine der Walzen oder einen der Zylinder der Druckmaschine aufgesprüht werden, oder das Feuchtmittel wird über einen Feuchtwalzenzug auf eine der Walzen oder einen der Zylinder übertragen. Ein Feuchtwalzenzug besteht aus einer Reihe von aneinander angestellten Walzen, die das Feuchtmittel jeweils auf die nachfolgende Walze und schließlich auf den gewünschten Druckwerkszylinder übertragen. Das Feuchtmittel wird entweder in Form von winzigen Tropfen auf eine der Walzen des Feuchtwalzenzugs aufgesprüht oder von einer teilweise in Feuchtmittel eingetauchten, sich im Feuchtmittelbehälter drehenden Walze aufgenommen. Feuchtwalzenzüge sind aufgrund der Anzahl der zum Verteilen und zur Übertragung des Feuchtmittels benötigten Walzen häufig teuer und wartungsaufwendig.Basically, there are two types of transfer of dampening solution to the rollers or cylinders of a printing press, of which at least one application is usually found: The fountain solution can be sprayed either in the form of tiny drops directly on one of the rollers or one of the cylinders of the printing press, or the dampening solution is transferred to one of the rollers or one of the cylinders via a dampening train. A dampening train consists of a series of juxtaposed rollers which transfer the dampening solution respectively to the subsequent roller and finally to the desired printing cylinder. The dampening solution is sprayed either in the form of tiny drops on one of the rollers of the dampening train or taken up by a partially immersed in dampening solution, rotating in the fountain solution tank roller. Dampening rollers are often expensive and maintenance-intensive due to the number of rollers required to disperse and transfer the dampening solution.

Es sind ferner verschiedene Systeme zur direkten Übertragung des Feuchtmittels auf eine Walze oder einen Zylinder mittels Sprühdüsen bekannt, z. B. aus der US 4,19,907, der US 4,649,818, der US 4,815,375, der US 4,932,319, der US 5,025,722 und der US 5,595,116. Die beschriebenen Sprühfeuchtwerke umfassen eine Reihe von Sprühdüsen, die einen konischen oder fächerförmigen Feuchtmittel-Sprühnebel abgeben. Die Düsen sind zueinander in der Weise ausgerichtet, dass der Sprühnebel jeder Düse sich unmittelbar an den Sprühnebel der benachbarten Düsen anschließt, um sicherzustellen, dass die zu befeuchtende Walze flächendeckend besprüht wird. Es sind verschiedene Systeme bekannt, die eine gleichmäßige Verteilung des Feuchtmittels auf der Oberfläche der Walze oder des Zylinders gewährleisten, wenn z. B. höhere Durchflussleistungen benötigt werden. In der US 4,815,375 ist beispielsweise ein komplexes mechanisches System beschrieben, welches eine Veränderung der Abstände zwischen benachbarten Düsen ermöglicht, um einen ungleichmäßigen Feuchtmittelauftrag durch ein Überlappen des Sprühnebels von benachbarten Düsen auszuschließen. In anderen Anordnungen des Standes der Technik wird eine gepulste Feuchtmittelzufuhr in Verbindung mit den Sprühdüsen nachgeordneten Verreibwalzen eingesetzt, um einen gleichmäßigen Feuchtmittelauftrag auf der gesamten Walzenoberfläche zu erreichenThere are also various systems for direct transfer of dampening solution to a roller or a cylinder by means of spray nozzles known, for. From US 4,19,907, US 4,649,818, US 4,815,375, US 4,932,319, US 5,025,722 and US 5,595,116. The spray dampening units described comprise a series of spray nozzles which emit a conical or fan-shaped fountain solution spray. The nozzles are aligned with each other in such a way that the spray of each nozzle is immediately adjacent to the spray of the adjacent nozzles, to ensure that the roller to be moistened is sprayed area-wide. There are various systems known that ensure a uniform distribution of dampening solution on the surface of the roller or the cylinder when z. B. higher flow rates are needed. In US 4,815,375, for example, a complex mechanical system is described, which allows a change in the distances between adjacent nozzles to exclude uneven dampening application by overlapping the spray from adjacent nozzles. In other prior art arrangements, a pulsed fountain solution feed is used in conjunction with the downstream nozzles of the spray nozzles to achieve uniform fountain solution coverage over the entire roll surface

Es ist eine Aufgabe der vorliegenden Erfindung, ein Verfahren zum Befeuchten eines Bauteils in einer Druckmaschine zu schaffen, welches es ermöglicht, ohne einen aufwendigen Feuchtwalzenzug oder ein komplexes mechanisches System zur Veränderung der Abstände benachbarter Düsen , das Feuchtmittel gleichmäßig und in gewünschter Dosierung auf das Bauteil aufzutragen.It is an object of the present invention to provide a method for moistening a component in a printing machine, which makes it possible, without a complicated dampening train or a complex mechanical system for changing the distances between adjacent nozzles, the fountain solution uniformly and in the desired dosage on the component apply.

Es ist eine weitere Aufgabe der vorliegenden Erfindung, eine Druckmaschine zu schaffen, in welcher Feuchtmittel gleichmäßig in gewünschter Dosierung auf das Bauteil aufgetragen werden kann.It is a further object of the present invention to provide a printing machine in which dampening solution can be uniformly applied to the component in the desired dosage.

Diese Aufgaben werden erfindungsgemäß durch die Merkmale von Anspruch 1 und Anspruch 9 gelöst.These objects are achieved by the features of claim 1 and claim 9.

Weitere Merkmale der Erfindung ergeben sich aus den Unteransprüchen.Further features of the invention will become apparent from the dependent claims.

Die Erfindung sieht ein Verfahren sowie eine Druckmaschine vor, mittels dessen bzw. derer das Feuchtmittel vorzugsweise in Form von im Wesentlichen kontinuierlichen Feuchtmittel-Strahlen von hoher Dichte auf ein Bauteil, z. B. eine Walze oder einen Zylinder, übertragen wird. Die Bezeichnung "kontinuierlicher Strahl" bezieht sich auf einen gleichmäßigen, vorzugsweise wirbelfreien Flüssigkeitsstrahl, der eine minimale Anzahl von einzelnen Feuchtmitteltropfen erzeugt. Erfindungsgemäß erfolgt die Feuchtmittelzufuhr nicht oder nur minimal in Tropfenform. Die erfindungsgemäßen kontinuierlichen Strahlen von hoher Dichte treffen beispielsweise auf die Walze oder den Zylinder und das Feuchtmittel verteilt sich auf der Oberfläche der Walze oder des Zylinders, indem es sich, ausgehend von der Auftragsstelle des Strahls, radial auf der Oberfläche der Walze oder des Zylinders ausbreitet und sozusagen Pfützen bildet. Jeder der kontinuierlichen Strahlen wird durch eine Strahlblende, vorzugsweise eine Düse oder Mikrodüse, erzeugt, durch die das Feuchtmittel bei geeignetem Druck des Feuchtmittels in Form eines kontinuierlichen, relativ gleichmäßigen, vorzugsweise laminaren Strahls austritt.The invention provides a method and a printing machine, by means of which or which the fountain solution, preferably in the form of substantially continuous dampening high-density radiation onto a component, eg. As a roller or a cylinder is transmitted. The term "continuous jet" refers to a uniform, preferably vortex-free liquid jet which produces a minimum number of individual drops of fountain solution. According to the invention, the fountain solution is not or only minimally in the form of drops. For example, the high-density continuous jets of the invention impinge on the roller or cylinder and the fountain solution spreads on the surface of the roller or cylinder by spreading radially on the surface of the roller or cylinder from the application point of the jet and forms puddles, so to speak. Each of the continuous jets is produced by a jet orifice, preferably a nozzle or micro nozzle, through which the dampening solution exits at a suitable pressure of the dampening solution in the form of a continuous, relatively uniform, preferably laminar jet.

Erfindungsgemäß ist vorzugsweise ein Druckverteiler vorgesehen, entlang dem vorzugsweise eine Reihe von beabstandeten Strahlblenden in der Weise angeordnet ist, dass entlang der Länge der zu befeuchtenden Walze eine Reihe von kontinuierlichen Strahlen erzeugt wird. Die Strahlblenden sind vorzugsweise als Mikrodüsen ausgebildet, und der Druck des Feuchtmittels ist vorzugsweise über Steuerventile regulierbar. Die aus den Strahlblenden austretenden gleichmäßigen Strahlen, die sich in Form von Feuchtmittel-Pfützen auf der Walzenoberfläche verteilen, ermöglichen eine gleichmäßige Verteilung des Feuchtmittels über die gesamte Länge der Walzen- oder Zylinderoberfläche. Durch die Verteilung des Feuchtmittels in Form von Pfützen auf der Walzenoberfläche fließt der kontinuierliche Strahl einer jeden Strahlblende auf der Walzenoberfläche mit den kontinuierlichen Strahlen der benachbarten Strahlblenden zusammen, wobei nur geringe Schwankungen in der Feuchtmittelmenge entlang der gesamten Walzenoberfläche entstehen. Auf diese Weise wird durch die vorliegende Erfindung die Druckqualität erhöht, indem durch Schwankungen in der Feuchtmittelmenge entlang der Walzenoberfläche verursachte Schwankungen in der Druckqualität vermieden werden.According to the invention, a pressure distributor is preferably provided, along which a number of spaced jet diaphragms are preferably arranged in such a way that a series of continuous jets is produced along the length of the roller to be moistened. The jet apertures are preferably designed as micro-nozzles, and the pressure of the fountain solution is preferably adjustable via control valves. The uniform jets emerging from the jet apertures, which are distributed in the form of fountain solution puddles on the roll surface, allow a uniform distribution of dampening solution over the entire length of the roll or cylinder surface. As a result of the distribution of the dampening solution in the form of puddles on the roll surface, the continuous jet of each jet diaphragm on the roll surface flows together with the continuous jets of the adjacent jet orifices, with only slight fluctuations in the amount of dampening solution along the entire roll surface. In this way, the present invention increases the print quality by avoiding fluctuations in print quality caused by variations in the amount of fountain solution along the roll surface.

Bei den auf aufgesprühten Tropfen basierenden Sprühfeuchtwerken des Standes der Technik führen Schwankungen im Feuchtmittelauftrag zu Überlappungen der aus den Sprühdüsen austretenden konischen oder fächerförmigen Sprühnebeln oder zu Lücken zwischen den Sprühnebeln. Um diese zu vermeiden, sind in Vorrichtungen des Standes der Technik komplizierte mechanische Systeme zur Verstellung der Abstände zwischen den Sprühdüsen nötig. In anderen Vorrichtungen des Standes der Technik sind Verreibwalzen nötig, um das Feuchtmittel entlang der Walzenoberfläche zu verteilen. Da sich in der erfindungsgemäßen Vorrichtung das Feuchtmittel aufgrund der kontinuierlichen, gleichmäßigen Strahlen in Form von Pfützen bzw. Lachen auf der Walzenoberfläche verteilt und auf der Walzenoberfläche zusammenläuft, besteht keine Notwendigkeit, die Abstände zwischen den Strahlblenden zu verändern oder das Feuchtmittel entlang der Walzenoberfläche zu verteilen.Fluctuations in the application of dampening solution lead to overlaps of the spray-dampening compositions of the state of the art based on spray-on drops Spray nozzles exiting conical or fan-shaped spray or gaps between the spray. To avoid this, complicated mechanical systems for adjusting the distances between the spray nozzles are necessary in devices of the prior art. In other prior art devices, distributor rollers are needed to disperse the dampening solution along the roll surface. Since, in the device according to the invention, the dampening solution spreads on the roll surface due to the continuous, uniform jets in the form of puddles or pools and converges on the roll surface, there is no need to change the distances between the jet diaphragms or to distribute the dampening solution along the roll surface ,

Die Merkmale der vorliegenden Erfindung werden in der folgenden Beschreibung bevorzugter Ausführungsbeispiele in Zusammenhang mit den beigefügten, nachfolgend aufgeführten Zeichnungen näher erläutert.The features of the present invention will be explained in more detail in the following description of preferred embodiments in conjunction with the accompanying drawings listed below.

Es zeigen:

Fig. 1
eine teilweise Vorderansicht einer erfindungsgemäßen Vorrichtung;
Fig. 2
eine teilweise Draufsicht der in Fig. 1 gezeigten Vorrichtung;
Fig. 3
eine Querschnittsansicht der in Fig. 1 gezeigten Vorrichtung;
Fig. 4
eine schematische Seitenansicht der erfindungsgemäßen Vorrichtung in einer Druckmaschine; und
Fig. 5
eine Seitenansicht der in der erfindungsgemäßen Weise befeuchteten Walze, welche die Art und Weise zeigt, in der sich das Feuchtmittel verteilt.
Show it:
Fig. 1
a partial front view of a device according to the invention;
Fig. 2
a partial plan view of the device shown in Figure 1;
Fig. 3
a cross-sectional view of the device shown in Figure 1;
Fig. 4
a schematic side view of the device according to the invention in a printing machine; and
Fig. 5
a side view of the moistened in the manner according to the invention roller, showing the manner in which distributes the dampening solution.

Fig. 1 bis 3 zeigen einen Druckverteiler 1 gemäß einer Ausführungsform der vorliegenden Erfindung. Der erfindungsgemäße Druckverteiler 1 umfasst eine vorzugsweise entlang der Länge des Druckverteilers 1 verlaufende Feuchtmittel-Einlaufleitung 5, die vorzugsweise mit einem Behälter D verbunden ist, der mit Druck beaufschlagtes Feuchtmittel enthält.Figs. 1 to 3 show a pressure distributor 1 according to an embodiment of the present invention. The pressure distributor 1 according to the invention comprises a dampening solution inlet line 5, preferably running along the length of the pressure distributor 1, which is preferably connected to a container D containing pressurized dampening solution.

Ein Bolzen 7 kann vorgesehen sein, um ein Ende der Einlaufleitung 5 zu verschließen. Durch die Einlaufleitung 5 wird dem Druckverteiler 1 mit Druck beaufschlagtes Feuchtmittel zugeführt, mit dem eine Walze oder ein Zylinder in einer Druckmaschine befeuchtet werden soll.A bolt 7 may be provided to close one end of the inlet pipe 5. Through the inlet line 5, the pressure distributor 1 is supplied with pressurized dampening solution with which a roller or a cylinder is to be moistened in a printing press.

Eine Reihe von Austrittsleitungen 9 verlaufen durch eine Wand des Druckverteilers 1. Die Austrittsleitungen 9 verbinden das Innere der Einlaufleitung 5 mit jeweils einem von einer Reihe von am Druckverteiler 1 angeordneten Steuerventilen 6. Die Austrittsleitungen 9 leiten demgemäß mit Druck beaufschlagtes Feuchtmittel zu den Steuerventilen 6. Die Steuerventile 6 können als jedes beliebige Ventil ausgebildet sein, das geeignet ist, einen Flüssigkeitsstrom zu steuern. Die Steuerventile 6 werden von einer beliebigen bekannten Steuerungseinheit 10 gesteuert, beispielsweise einer pneumatischen oder hydraulischen Steuerkonsole, einem elektronischen Mikroprozessor oder einer anderen elektronischen Steuerungseinheit. Die Steuerungseinheit 10 sendet über Leitungen 11 Signale an jedes einzelne der Steuerventile 6 und kontrolliert auf diese Weise das Öffnen und Schließen und den Grad der Öffnung bzw. des Schließens der Steuerventile 6.A series of outlet lines 9 extend through a wall of the pressure distributor 1. The outlet lines 9 connect the interior of the inlet line 5 to one of a series of control valves 6 arranged on the pressure distributor 1. The outlet lines 9 accordingly supply pressurized dampening solution to the control valves 6. The control valves 6 may be formed as any valve capable of controlling a flow of liquid. The control valves 6 are controlled by any known control unit 10, for example a pneumatic or hydraulic control console, an electronic microprocessor or other electronic control unit. The control unit 10 sends via lines 11 signals to each one of the control valves 6 and controls in this way the opening and closing and the degree of opening or closing of the control valves 6.

Die Steuerventile 6 steuern den Feuchtmittelzufluss von der Einlaufleitung 5 zu weiteren Einlauföffnungen 8, die jeweils zu einer Druckkammer 4 einer Vielzahl von entlang der Länge des Druckverteilers 1 angeordneten Druckkammern 4 führen. Die Steuerventile 6 regulieren demgemäß den Druck in jeder der Druckkammern 4. Jede der Druckkammern 4 leitet Feuchtmittel zu einer Gruppe von über die Breite des Druckverteilers 1 beabstandet angeordneten Strahlblenden 3. Die Strahlblenden 3 sind in einem Abstand d zueinander angeordnet und erzeugen jeweils einen kontinuierlichen Feuchtmittel-Strahl 9, der aus den Strahlblenden 3 austritt und auf eine Walze oder einen Zylinder, beispielsweise einen Plattenzylinder P, auftrifft.The control valves 6 control the Feuchtmittelzufluss from the inlet line 5 to further inlet openings 8, each leading to a pressure chamber 4 a plurality of arranged along the length of the pressure manifold 1 pressure chambers 4. The control valves 6 accordingly regulate the pressure in each of the pressure chambers 4. Each of the pressure chambers 4 directs fountain solution to a group of spaced across the width of the pressure distributor 1 arranged jet aperture 3. The jet aperture 3 are arranged at a distance d to each other and each produce a continuous dampening solution Beam 9 emerging from the beam apertures 3 and impinging on a roller or a cylinder, for example a plate cylinder P.

Die Strahlblenden 3 sind vorzugsweise als Mikrodüsen, d. h. als Düsen mit sehr kleiner Öffnung, ausgebildet. Sie können direkt in eine Seite des Druckverteilers 1 eingearbeitet, z. B. gebohrt, sein oder eine separat hergestellte Komponente bilden, die in eine in der Seite des Druckverteilers 1 gebildete Öffnung eingefügt wird. Wie nachfolgend näher erläutert wird, ist die Größe der Strahlblenden 3 derart gewählt, dass die Strahlblenden bei einem Druck des Feuchtmittels, wie er in den Druckkammern 4 durch die Steuerventile 6 erzeugt wird, einen kontinuierlichen Feuchtmittel-Strahl 8 von hoher Dichte und insbesondere einen aus einem im Wesentlichen laminaren Strom bestehenden Strahl erzeugen.The jet apertures 3 are preferably designed as micro-nozzles, ie as nozzles with a very small opening. They can be incorporated directly into one side of the pressure distributor 1, z. B. drilled, be or form a separately prepared component which is inserted into an opening formed in the side of the pressure distributor 1. As will be explained in more detail below, the size of the beam aperture 3 is selected such that the beam aperture in a pressure of the fountain solution, as it is generated in the pressure chambers 4 by the control valves 6, a continuous dampening jet 8 of high density and in particular produce a consisting of a substantially laminar flow beam.

Um sicherzustellen, dass die Strahlblenden 3 einen kontinuierlichen Feuchtmittel-Strahl von hoher Dichte erzeugen, kann der Druck in den Druckkammern 4 in der Weise gesteuert werden, dass er sich innerhalb eines geeigneten Bereichs bewegt, in dem ein im Wesentlichen laminarer Strom aus den Strahlblenden 3 austritt, die alle eine vorgegebene Größe haben. Der Druck in den Druckkammern 4 wird über die Steuerventile 6 reguliert, die wiederum von der Steuereinheit 10 gesteuert werden. Ein Rückkoppelungssystem 12, das z. B. zur Überwachung des Drucks des Feuchtmittels in der Druckkammer 4 mit einem (nicht gezeigten) Druckmesskopf in den Druckkammern 4 gekoppelt sein kann, kann dazu eingesetzt werden sicherzustellen, dass der Druck in den Druckkammern 4 sich innerhalb des geeigneten Bereichs bewegt, so dass kontinuierliche Strahlen aus den Strahlblenden 3 vorgegebener Größe austreten. Innerhalb dieses Druckbereichs kann der Druck in den Druckkammern 4 durch die Steuerungseinheit reguliert werden, so dass die Durchflussleistung verändert werden kann. Die Durchflussleistung kann auf diese Weise variiert und an unterschiedliche Bedingungen angepasst werden, wenn an einer Walze oder einem Zylinder in der Druckmaschine mehr oder weniger Feuchtmittel benötigt wird.In order to ensure that the jet apertures 3 produce a continuous fountain solution jet of high density, the pressure in the pressure chambers 4 can be controlled to move within a suitable range in which a substantially laminar flow from the jet apertures 3 exit, all of a given size. The pressure in the pressure chambers 4 is regulated via the control valves 6, which in turn are controlled by the control unit 10. A feedback system 12, the z. For example, to monitor the pressure of the dampening solution in the pressure chamber 4 with a pressure gauge (not shown) in the pressure chambers 4 may be used to ensure that the pressure in the pressure chambers 4 moves within the appropriate range, so that continuous Rays out of the beam aperture 3 of predetermined size. Within this pressure range, the pressure in the pressure chambers 4 can be regulated by the control unit, so that the flow rate can be changed. The flow rate can be varied in this way and adapted to different conditions when more or less dampening solution is needed on a roller or a cylinder in the printing press.

In Fig. 4 ist der erfindungsgemäße Druckverteiler 1 in einer Position gezeigt, in welcher der sich in die Richtung R drehende Plattenzylinder P befeuchtet wird, der in einer Offset-Druckmaschine auf einen Gummituchzylinder B Farbe überträgt. Wie in Fig. 4 gezeigt ist, ist der Druckverteiler 1 in der Weise ausgerichtet, dass er Feuchtmittel in Form von kontinuierlichen Strahlen von hoher Dichte auf die Oberfläche des Plattenzylinders P überträgt. In Abhängigkeit vom Druck des Feuchtmittels in den Druckkammern 4 kann die Durchflussleistung und die Geschwindigkeit der aus den Strahlblenden 3 austretenden Strahlen in der Weise variiert werden, dass unterschiedliche Strahlprofile S1 (geringe Durchflussleistung), S2 (mittlere Durchflussleistung) oder S3 (hohe Durchflussleistung) erzeugt werden. Die Durchflussleistung der Strahlblenden 3 wird durch die Steuerventile 6 für jede Druckkammer 4 reguliert. Die unterschiedlichen Durchflussleistungen steuern den Grad der Befeuchtung der Oberfläche des Plattenzylinders P. Auf diese Weise kann der Grad der Befeuchtung des Plattenzylinders P reguliert werden, während gleichzeitig sichergestellt ist, dass der Druckverteiler 1 und die Strahlblenden 3 kontinuierliche Strahlen erzeugen.In Fig. 4, the pressure distributor 1 according to the invention is shown in a position in which the rotating in the direction R plate cylinder P is moistened, which transmits in an offset printing press on a blanket cylinder B color. As shown in Fig. 4, the pressure distributor 1 is oriented so as to transfer dampening means in the form of continuous high-density jets to the surface of the plate cylinder P. Depending on the pressure of the dampening solution in the pressure chambers 4, the flow rate and the speed of the beams emerging from the jet aperture 3 can be varied in such a way that different beam profiles S 1 (low flow rate), S 2 (average flow rate) or S 3 (high Flow rate) are generated. The flow capacity of the jet aperture 3 is regulated by the control valves 6 for each pressure chamber 4. The different flow rates control the Degree of moistening of the surface of the plate cylinder P. In this way, the degree of moistening of the plate cylinder P can be regulated while at the same time ensuring that the pressure distributor 1 and the jet diaphragms 3 generate continuous jets.

Die Strahlblenden 3 sind in der Weise zueinander beabstandet angeordnet, dass die von ihnen erzeugten kontinuierlichen Strahlen S eine gleichmäßige Verteilung des Feuchtmittels auf der Oberfläche der zu befeuchtenden Walze oder des zu befeuchtenden Zylinders bewirken. In Fig. 5 ist gezeigt, wie das Feuchtmittel auf die Oberfläche des Plattenzylinders P aufgebracht wird. Die kontinuierlichen Strahlen S, welche in ihrem Auftreffpunkt auf dem Plattenzylinder P im Querschnitt gezeigt sind, verteilen sich in Form von Pfützen bzw. Lachen, die sich in die durch die Pfeile angedeuteten Richtungen ausbreiten. Aufgrund der Verteilung des Feuchtmittels vom Auftreffpunkt der kontinuierlichen Strahlen S aus in Form von Pfützen fließt das Feuchtmittel des einen Strahls S mit dem Feuchtmittel des angrenzenden kontinuierlichen Strahls S in einem Schnittbereich I zusammen. Der Abstand d ist in der Weise gewählt, dass das sich verteilende Feuchtmittel bei den unterschiedlichen möglichen Durchflussleistungen der Strahlblenden 3 mit dem sich verteilenden Feuchtmittel des benachbarten Strahls S zusammenfließt, ohne dass Lücken entstehen. Im dem Auftreffpunkt der kontinuierlichen Strahlen S in Drehrichtung nachgeordneten Bereich bildet das Feuchtmittel eine Befeuchtungsschicht L, die sich über die gesamte Länge des Plattenzylinders P erstreckt und auf diese Weise den Plattenzylinder gleichmäßig befeuchtet.The jet apertures 3 are arranged at a distance from one another in such a way that the continuous rays S produced by them effect a uniform distribution of the fountain solution on the surface of the roll to be moistened or of the cylinder to be moistened. In Fig. 5 it is shown how the dampening solution is applied to the surface of the plate cylinder P. The continuous rays S, which are shown in cross section at their point of impact on the plate cylinder P, are distributed in the form of puddles, which propagate in the directions indicated by the arrows. Due to the distribution of the dampening solution from the point of impact of the continuous jet S in the form of puddles, the dampening solution of one jet S flows together with the dampening solution of the adjacent continuous jet S in a cutting region I. The distance d is chosen in such a way that the distributing fountain solution flows together with the different possible flow rates of the jet aperture 3 with the distributing dampening solution of the adjacent jet S without gaps. In the impingement point of the continuous jet S in the downstream direction region of the fountain solution forms a moistening layer L, which extends over the entire length of the plate cylinder P and in this way the plate cylinder evenly moistened.

Liste der BezugszeichenList of reference numbers

11
Druckverteilerpressure distributor
33
Strahlblendenbeam aperture
44
Druckkammernpressure chambers
55
Einlaufleitunginlet line
66
Steuerventilecontrol valves
77
Bolzenbolt
88th
Einlauföffnungeninlet openings
99
Austrittsleitungexit line
1010
Steuerungseinheitcontrol unit
1111
Leitungencables
1212
Rückkoppelungs-SystemFeedback effects system
dd
Abstanddistance
BB
GummituchzylinderBlanket cylinder
DD
FeuchtmittelbehälterDampening solution container
LL
Befeuchtungsschichtmoistening
RR
Drehrichtungdirection of rotation
PP
Plattenzylinderplate cylinder
SS
kontinuierlicher Strahlcontinuous beam
S1 S 1
geringe Durchflussleistunglow flow rate
S2 S 2
mittlere Durchflussleistungmean flow rate
S3 S 3
hohe Durchflussleistunghigh flow rate

Claims (15)

  1. Method for dampening a component (P) in a printing machine, in particular a plate cylinder, wherein dampening solution is held in at least one pressure chamber (4), comprising the following method steps:
    feeding the dampening solution to at least one jet orifice (3) communicating with the pressure chamber;
    producing at least one substantially continuous dampening solution jet (S), which is directed at the component, using the at least one jet orifice (3);
    distributing the dampening solution on the component (P) by means of the at least one continuous jet (S).
  2. Method according to Claim 1, wherein
    the dampening solution is fed to at least one nozzle (3), in particular a micronozzle.
  3. Method according to Claim 1 or 2, wherein
    the dampening solution is distributed on a cylinder (P) in the printing machine.
  4. Method according to any one of Claims 1 to 3, wherein the pressure of the dampening solution is controlled above the at least one jet orifice (3), in particular by means of a control valve (6).
  5. Method according to Claim 4, wherein
    the pressure of the dampening solution is controlled such that the quantity of dampening solution which is fed to the component (P) is regulated.
  6. Method according to Claim 4 or 5, wherein
    the pressure of the dampening solution is monitored.
  7. Method according to any one of the preceding Claims,
    wherein
    the or each continuous dampening solution jet (S) is a laminar jet.
  8. Method according to any one of the preceding Claims,
    wherein
    dampening solution is conveyed from the at least one pressure chamber (4) to a group of jet orifices (3).
  9. Printing machine with a device for dampening a component (P) in the printing machine, in particular a plate cylinder (P), wherein the device comprises at least one pressure chamber (4), which is adapted to hold dampening solution, and at least one jet orifice (3),
    wherein
    the jet orifice (3) is formed to produce a substantially continuous dampening solution jet (S), which is directed at the component, and communicates with the pressure chamber (4).
  10. Printing machine according to Claim 9, wherein
    the at least one jet orifice (3) is a nozzle (3), in particular a micronozzle (3).
  11. Printing machine according to Claim 9 or 10, wherein
    at least one control valve (6), which regulates the pressure of the dampening solution in the at least one pressure chamber (4).
  12. Printing machine according to Claim 11, comprising
    a control unit (10) for controlling the at least one control valve (6).
  13. Printing machine according to Claim 11 or 12, comprising
    a monitoring unit (12) for monitoring the pressure of the dampening solution.
  14. Printing machine according to any one of the preceding Claims 9 to 13,
    wherein
    the or each jet orifice (3) is adapted to form the substantially continuous dampening solution jet as a laminar jet.
  15. Printing machine according to any one of the preceding Claims 9 to 14,
    wherein
    dampening solution can be conveyed from the at least one pressure chamber (4) to a group of jet orifices (3).
EP00121915A 1999-11-03 2000-10-07 Device and method for dampening a component in a printing machine Expired - Lifetime EP1097812B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US433160 1999-11-03
US09/433,160 US6561090B1 (en) 1999-11-03 1999-11-03 Printing press dampener using straight streams and method of dampening a printing press

Publications (3)

Publication Number Publication Date
EP1097812A2 EP1097812A2 (en) 2001-05-09
EP1097812A3 EP1097812A3 (en) 2002-05-22
EP1097812B1 true EP1097812B1 (en) 2006-11-29

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EP00121915A Expired - Lifetime EP1097812B1 (en) 1999-11-03 2000-10-07 Device and method for dampening a component in a printing machine

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US (1) US6561090B1 (en)
EP (1) EP1097812B1 (en)
JP (1) JP4755332B2 (en)
AT (1) ATE346747T1 (en)
DE (2) DE50013808D1 (en)

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US8347787B1 (en) 2011-08-05 2013-01-08 Palo Alto Research Center Incorporated Variable data lithography apparatus employing a thermal printhead subsystem
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Also Published As

Publication number Publication date
US6561090B1 (en) 2003-05-13
JP4755332B2 (en) 2011-08-24
DE10050255A1 (en) 2001-07-12
DE50013808D1 (en) 2007-01-11
EP1097812A2 (en) 2001-05-09
ATE346747T1 (en) 2006-12-15
EP1097812A3 (en) 2002-05-22
JP2001162763A (en) 2001-06-19

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