EP0428893B1 - Printing unit - Google Patents

Printing unit Download PDF

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Publication number
EP0428893B1
EP0428893B1 EP90120395A EP90120395A EP0428893B1 EP 0428893 B1 EP0428893 B1 EP 0428893B1 EP 90120395 A EP90120395 A EP 90120395A EP 90120395 A EP90120395 A EP 90120395A EP 0428893 B1 EP0428893 B1 EP 0428893B1
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EP
European Patent Office
Prior art keywords
layer
printing unit
cylinder
unit according
temperature
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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.)
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Application number
EP90120395A
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German (de)
French (fr)
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EP0428893A2 (en
EP0428893A3 (en
Inventor
Thomas John
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Manroland AG
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MAN Roland Druckmaschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/26—Construction of inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N7/00—Shells for rollers of printing machines
    • B41N7/06—Shells for rollers of printing machines for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/02—Top layers

Definitions

  • the invention relates to a printing unit for a printing press with a ink-bearing cylinder provided with a cup, interacting with a doctor blade, according to the preamble of claim 1.
  • JP-A-57207073 shows an intaglio forme cylinder carrying a layer of a thermoplastic synthetic rubber. This layer is charged positively with a charger attached to the cylinder. During the subsequent selective heating in accordance with a recording signal, wells are formed at the heated points. After unloading the layer, it smoothes out again when heated again. The device requires potential differences for the formation of wells, and the layer can only be deformed in the heated state. The amount of equipment required is correspondingly high.
  • the invention has for its object to design a printing unit with little technical effort so that the amount of ink guided by the cylinder can be changed without wear.
  • the gravure forme cylinder 1 has an intaglio printing cylinder 1 and an impression cylinder 2, between which the web 3 to be printed is passed.
  • the gravure forme cylinder 1 is partially immersed in an ink pan 4.
  • a doctor blade 5 can be set on the gravure forme cylinder 1.
  • the gravure form cylinder 1 has, cf. 3 and 4 on a metallic core 6, on which a porous, volume-changing intermediate layer 7 is applied, for example by plasma spraying.
  • a layer 8 made of a material with a temperature-dependent shape memory is applied on the outside to the intermediate layer 7.
  • Materials with a temperature-dependent shape memory can be constructed on a metallic basis, as described, for example, in the "Southren” magazine in 1987, pages 58 to 61 and 70 to 73, or on a plastic basis, as described in the "highTech” magazine, issue 4 / 1989 are described.
  • a temperature control device 9 is provided in front of the circumference of the intaglio printing cylinder 1.
  • the temperature control device 9 has As shown schematically in Fig. 2, a plurality of heating elements 10 arranged side by side in the form of very small resistors. The structure of such heat sources is described in the journal "Feintechnik und Meßtechnik” 95 (1987) 7 pages 433 to 435.
  • 3 shows that a multiplicity of cups 11 have been introduced into the layer 8. This can be done, for example, by mettling, that is, a tensionless deformation of the gravure cylinder 1.
  • 3 shows the shape of the layer 8 in a first shape state.
  • Each circumferential row of cups 11 is assigned a heating element 10 in the temperature control device 9, as is shown schematically in FIG. 2. If a heating element 10 is switched on, it heats the area of a well 11 of the layer 8. The layer 8 consequently deforms in this area and assumes the second shape state shown in FIG. 4, in which the respective well 11 disappears and the layer 8 forms a section of a cylinder jacket in the area of the well.
  • the porous intermediate layer 7 ensures that the outer diameter of the gravure cylinder 1 does not change during the transition from one to the other.
  • the intermediate layer 7 can advantageously also consist of a material with a temperature-dependent shape memory.
  • the line 5 shows the change in the shape of a material with temperature-dependent shape memory versus temperature.
  • the line a shows that the first shape state F 1 is retained until a temperature T 1 is reached.
  • T 2 is the second Shape state F 2 reached.
  • the second shape state F 2 remains until a temperature T 3 is reached which is below the temperatures T 1 and T 2.
  • the first shape state F 1 is only reached again when the temperature T 4 is cooled further. Between the temperatures T 1 and T 3, that is to say in the section ⁇ T, the given shape state thus remains unchanged. If the range of the usual working temperatures .DELTA.T * of the printing press lies within the range .DELTA.T, the shape of the area in the area of each individual well remains unchanged during the operation of the printing press.
  • a blanket cylinder 20, a plate cylinder 21 which can be covered with an offset printing plate, an application roller 22 with a flexible ink-accepting surface and a cylinder 23 serving as anilox roller are provided.
  • a dampening unit 24 can be set on the plate cylinder 21.
  • the cylinder 23 is supplied with ink by a doctor blade 25.
  • a temperature control device 26 is also arranged at a free location on the circumference of the cylinder 23.
  • the temperature control device 26 consists of a resistance heating element which extends over the entire width of the cylinder 23. If desired, the heating element can also be divided into zone-wide heating elements that can be switched on and off individually. Basically, there is also the possibility of using a temperature control device according to FIG. 1.
  • a given control of individual cells is not always necessary with anilox rollers.
  • the cylinder 23 has a hard metallic core 27 to which a layer 28 made of a material with a temperature-dependent shape memory is applied.
  • the layer 28 is expediently applied as a porous layer by plasma spraying. After it has been applied, it is clamped by tensionless deformation with a cup 29, cf. Fig. 7 provided. This also ensures that the outside of the layer 28 passes through in a closed manner.
  • the wells are introduced in a state defining the first shape Temperature T 4. Then the temperature of the layer 28 is brought to the value T 2, at which it assumes the second shape.
  • the cells 29 'of the second shape state are then given the desired final shape. This can again be done, for example, by mettling.
  • the inner porosity of the layer 28 in the first shape state is necessary in order to prevent a change in the outer diameter when changing to the second shape state.
  • the cylinder 30 is rotatably mounted on a fixed axis 31 and in turn has a porous layer 33 made of a material with a temperature-dependent shape memory that is applied to a metallic core 32. Cups 34 are introduced into the layer 33.
  • the cylinder 30 has an inner cavity 35 which is connected to a liquid circuit, for example a water circuit 38, via bores 36, 37.
  • a heat exchanger 39 in which the water flowing through can be cooled.
  • a feed pump 40 is also provided in the water circuit 38 to maintain the flow.
  • a second heat exchanger can also be provided to increase the temperature of the water cycle.
  • the layer 33 is transferred from one shape state to the other by heating the circulating water of the water circuit 38.
  • the water of the water cycle can be cooled or the temperature for reaching the first shape is such that it is reached automatically after the printing machine is switched off.
  • FIG. 11 shows a further coating.
  • a porous layer 51 made of a material with a temperature-dependent shape memory is applied to a hard core 50 of a cylinder, as is the case with the arrangement according to FIGS. 7 and 8. Cups are provided in layer 51, which are in the first shape 53 and 53 'in the second form.
  • an elastically deformable wear protection layer 52 is applied to the outside of the layer 51.
  • the wear protection layer 52 is only a few ⁇ m thick and expediently consists of TiN, TiAlN or TiCN.
  • FIG. 12 A further variant is shown in FIG. 12.
  • depressions 61 are machined into the outer surface of a hard core 60 of a cylinder.
  • the layer 62 made of a material with a temperature-dependent shape memory is designed as a thin-walled sleeve applied to the core.
  • layer 62 thus forms part of a cylinder jacket.
  • wells 63 form in the area of the depressions 61.
  • the depressions 61 are dimensioned such that they accommodate the layer 62 forming the wells 63.
  • This configuration is suitable not only for anilox rollers but also for gravure cylinders.
  • the layer 62 forms flatter cells in the first shape, as is the case with the arrangement according to FIGS. 7 and 8. Then it can be used for anilox rollers.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)

Description

Die Erfindung betrifft ein Druckwerk für eine Druckmaschine mit einem mit Näpfchen versehenen, mit einer Rakel zusammenwirkenden, farbführenden Zylinder gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a printing unit for a printing press with a ink-bearing cylinder provided with a cup, interacting with a doctor blade, according to the preamble of claim 1.

Die JP-A-57207073 zeigt einen Tiefdruckformzylinder, der eine Schicht aus einem thermoplastischen synthetischen Gummi trägt. Diese Schicht wird mit einem an den Zylinder angestellten Lader positiv aufgeladen. Bei der nachfolgenden selektiven Erhitzung entsprechend einem Aufzeichnungssignal bilden sich an den erhitzten Stellen Näpfchen. Nach dem Entladen der Schicht glättet sich diese bei erneutem Erhitzen wieder. Die Vorrichtung benötigt zur Näpfchenbildung Potentialunterschiede, und die Schicht ist nur im erhitzten Zustand verformbar. Entsprechend hoch ist der Geräteaufwand.JP-A-57207073 shows an intaglio forme cylinder carrying a layer of a thermoplastic synthetic rubber. This layer is charged positively with a charger attached to the cylinder. During the subsequent selective heating in accordance with a recording signal, wells are formed at the heated points. After unloading the layer, it smoothes out again when heated again. The device requires potential differences for the formation of wells, and the layer can only be deformed in the heated state. The amount of equipment required is correspondingly high.

Der Erfindung liegt die Aufgabe zugrunde, ein Druckwerk mit geringem technischem Aufwand so auszubilden, daß die Menge der vom Zylinder geführten Farbe verschleißfrei verändert werden kann.The invention has for its object to design a printing unit with little technical effort so that the amount of ink guided by the cylinder can be changed without wear.

Erfindungsgemäß wird dies durch Anwendung der Merkmale des Kennzeichens des Anspruchs 1 erreicht.According to the invention, this is achieved by applying the features of the characterizing part of claim 1.

Bei Anwendung der Erfindung ergibt sich der zusätzliche Vorteil, daß auch die Verteilung der Farbe entlang des Umfangs des Zylinders verändert werden kann.When using the invention, there is the additional advantage that the distribution of the color along the circumference of the cylinder can also be changed.

Mehrere Ausführungsbeispiele der Erfindung sind anhand der Zeichnung beschrieben. Auf dieser zeigt

Fig. 1
ein Tiefdruckwerk in einer schematischen Seitenansicht,
Fig. 2
eine schematische Ansicht des Tiefdruckformzylinders nach Fig. 1 von oben,
Fig. 3
einen Ausschnitt aus dem Zylinder nach Fig. 2 in einem ersten Formzustand,
Fig. 4
den Ausschnitt nach Fig. 3 in einem zweiten Formzustand
Fig. 5
ein Diagramm,
Fig. 6
eine schematische Darstellung eines Offsetdruckwerkes in einer Seitenansicht,
Fig. 7
einen Ausschnitt aus der Rasterwalze nach Fig. 6 in vergrößertem Maßstab in einem ersten Formzustand,
Fig. 8
einen Fig. 7 entsprechenden Ausschnitt in einem zweiten Formzustand,
Fig. 9
eine Rasterwalze in einem Querschnitt,
Fig. 10
einen Längsschnitt durch die Rasterwalze gemäß Fig. 9 und
Fig. 11 und 12
jeweils zwei Ausschnitte weiterer Ausführungsformen von Zylindern.
Several embodiments of the invention are described with reference to the drawing. On this shows
Fig. 1
a gravure printing unit in a schematic side view,
Fig. 2
2 shows a schematic view of the gravure forme cylinder according to FIG. 1 from above,
Fig. 3
3 shows a detail from the cylinder according to FIG. 2 in a first shape state,
Fig. 4
3 in a second form
Fig. 5
a diagram
Fig. 6
a schematic representation of an offset printing unit in a side view,
Fig. 7
6 shows a section of the anilox roller according to FIG. 6 on an enlarged scale in a first shape state,
Fig. 8
7 shows a section corresponding to FIG. 7 in a second shape,
Fig. 9
an anilox roller in a cross section,
Fig. 10
a longitudinal section through the anilox roller according to FIG. 9 and
11 and 12
two sections of further embodiments of cylinders.

Das Druckwerk gemäß Fig. 1 weist einen Tiefdruckformzylinder 1 und einen Gegendruckzylinder 2 auf, zwischen denen die zu bedruckende Bahn 3 hindurchgeführt ist. Der Tiefdruckformzylinder 1 taucht partiell in eine Farbwanne 4 ein. An den Tiefdruckformzylinder 1 ist eine Rakel 5 anstellbar.1 has an intaglio printing cylinder 1 and an impression cylinder 2, between which the web 3 to be printed is passed. The gravure forme cylinder 1 is partially immersed in an ink pan 4. A doctor blade 5 can be set on the gravure forme cylinder 1.

Der Tiefdruckformzylinder 1 weist, vgl. Fig. 3 und 4 einen metallischen Kern 6 auf, auf den eine poröse, volumenveränderbare Zwischenschicht 7, beispielsweise durch Plasmasprühen aufgetragen ist. Auf die Zwischenschicht 7 ist außen eine Schicht 8 aus einem Werkstoff mit einem temperaturabhängigen Formgedächtnis aufgebracht. Werkstoffe mit einem temperaturabhängigen Formgedächtnis können auf metallischer Basis aufgebaut sein, wie sie beispielsweise in der Zeitschrift "Maschinenmarkt" 1987, Seiten 58 bis 61 und 70 bis 73 beschrieben sind oder auf Kunststoffbasis aufgebaut sein, wie sie in der Zeitschrift "highTech" Heft 4/1989 beschrieben sind.The gravure form cylinder 1 has, cf. 3 and 4 on a metallic core 6, on which a porous, volume-changing intermediate layer 7 is applied, for example by plasma spraying. A layer 8 made of a material with a temperature-dependent shape memory is applied on the outside to the intermediate layer 7. Materials with a temperature-dependent shape memory can be constructed on a metallic basis, as described, for example, in the "Maschinenmarkt" magazine in 1987, pages 58 to 61 and 70 to 73, or on a plastic basis, as described in the "highTech" magazine, issue 4 / 1989 are described.

Vor dem Umfang des Tiefdruckformzylinders 1 ist eine Temperiereinrichtung 9 vorgesehen. Die Temperiereinrichtung 9 weist, wie in Fig. 2 schematisch gezeigt, eine Vielzahl von nebeneinander angeordneten Heizelementen 10 in Form sehr kleiner Widerstände auf. Der Aufbau derartiger Wärmequellen ist in der Zeitschrift "Feinwerktechnik und Meßtechnik" 95(1987)7 Seiten 433 bis 435 beschrieben.A temperature control device 9 is provided in front of the circumference of the intaglio printing cylinder 1. The temperature control device 9 has As shown schematically in Fig. 2, a plurality of heating elements 10 arranged side by side in the form of very small resistors. The structure of such heat sources is described in the journal "Feinwerktechnik und Meßtechnik" 95 (1987) 7 pages 433 to 435.

Fig. 3 zeigt, daß in die Schicht 8 eine Vielzahl von Näpfchen 11 eingebracht ist. Dies kann beispielsweise durch Molettieren, also eine spannlose Verformung des Tiefdruckformzylinders 1 erfolgen. Fig. 3 gibt die Form der Schicht 8 in einem ersten Formzustand wieder. Jeder in Umfangsrichtung umlaufenden Reihe von Näpfchen 11 ist in der Temperiereinrichtung 9 ein Heizelement 10 zugeordnet, wie in Fig. 2 schematisch dargestellt ist. Wird ein Heizelement 10 eingeschaltet, so erwärmt es den Bereich eines Näpfchens 11 der Schicht 8. Die Schicht 8 verformt sich infolgedessen in diesem Bereich und nimmt den in Fig. 4 wiedergegebenen zweiten Formzustand ein, in der das jeweilige Näpfchen 11 verschwindet und die Schicht 8 im Bereich des Näpfchens einen Abschnitt eines Zylindermantels bildet. Dabei stellt die poröse Zwischenschicht 7 sicher, daß sich der Außendurchmesser des Tiefdruckformzylinders 1 beim Übergang von dem einen in den anderen Formzustand nicht ändert. Vorteilhaft kann die Zwischenschicht 7 auch aus einem Werkstoff mit temperaturabhängigem Formgedächtnis bestehen. Durch schrittweises Drehen des Tiefdruckformzylinders 1 können somit nacheinander einige oder alle Näpfchen 11 einer Näpfchenreihe von einem Heizelement 10 mit Wärme beaufschlagt werden. Fig. 2 zeigt, daß es mit dieser Anordnung sowohl möglich ist, eine gesamte in Umfangsrichtung umlaufende Näpfchenreihe zu löschen als auch in Umfangsrichtung abwechselnd Näpfchen 11 offen zu lassen und benachbarte Näpfchen zu löschen. Hierdurch kann somit eine dem zu druckenden Sujet angepaßte Näpfchenkonfiguration in der Schicht 8 des Tiefdruckformzylinders 1 erzeugt werden.3 shows that a multiplicity of cups 11 have been introduced into the layer 8. This can be done, for example, by mettling, that is, a tensionless deformation of the gravure cylinder 1. 3 shows the shape of the layer 8 in a first shape state. Each circumferential row of cups 11 is assigned a heating element 10 in the temperature control device 9, as is shown schematically in FIG. 2. If a heating element 10 is switched on, it heats the area of a well 11 of the layer 8. The layer 8 consequently deforms in this area and assumes the second shape state shown in FIG. 4, in which the respective well 11 disappears and the layer 8 forms a section of a cylinder jacket in the area of the well. The porous intermediate layer 7 ensures that the outer diameter of the gravure cylinder 1 does not change during the transition from one to the other. The intermediate layer 7 can advantageously also consist of a material with a temperature-dependent shape memory. By gradually rotating the gravure forme cylinder 1, one or all of the wells 11 of a row of wells can thus be subjected to heat from a heating element 10 one after the other. Fig. 2 shows that with this arrangement it is possible to delete an entire row of cells rotating in the circumferential direction as well as to leave cells 11 open alternately in the circumferential direction and to delete adjacent cells. As a result, a well configuration which is adapted to the subject to be printed can be produced in layer 8 of gravure forme cylinder 1.

Im Diagramm nach Fig. 5 ist die Änderung des Formzustandes eines Werkstoffs mit temperaturabhängigem Formgedächtnis über der Temperatur aufgetragen. Der Linienzug a zeigt, daß der erste Formzustand F 1 bis zum Erreichen einer Temperatur T 1 erhalten bleibt. Bei einer höheren Temperatur T 2 ist dann der zweite Formzustand F 2 erreicht. Wie der Linienzug b zeigt, bleibt der zweite Formzustand F 2 bis zum Erreichen einer Temperatur T 3, die unter den Temperaturen T 1 und T 2 liegt, erhalten. Erst bei weiterer Abkühlung auf die Temperatur T 4 wird der erste Formzustand F 1 wieder erreicht. Zwischen den Temperaturen T 1 und T 3, also im Abschnitt ΔT, bleibt somit der jeweils gegebene Formzustand unverändert beibehalten. Liegt der Bereich der üblichen Arbeitstemperaturen ΔT* der Druckmaschine innerhalb des Bereichs ΔT, so bleibt der Formzustand im Bereich jedes einzelnen Näpfchens während des Betriebs der Druckmaschine unverändert.5 shows the change in the shape of a material with temperature-dependent shape memory versus temperature. The line a shows that the first shape state F 1 is retained until a temperature T 1 is reached. At a higher temperature T 2 is the second Shape state F 2 reached. As the line b shows, the second shape state F 2 remains until a temperature T 3 is reached which is below the temperatures T 1 and T 2. The first shape state F 1 is only reached again when the temperature T 4 is cooled further. Between the temperatures T 1 and T 3, that is to say in the section ΔT, the given shape state thus remains unchanged. If the range of the usual working temperatures .DELTA.T * of the printing press lies within the range .DELTA.T, the shape of the area in the area of each individual well remains unchanged during the operation of the printing press.

Beim Druckwerk gemäß Fig. 6 sind ein Gummituchzylinder 20, ein mit einer Offsetdruckplatte belegbarer Plattenzylinder 21, eine Auftragwalze 22 mit nachgiebiger farbannehmender Oberfläche und ein als Rasterwalze dienender Zylinder 23 vorgesehen. An den Plattenzylinder 21 ist ein Feuchtwerk 24 anstellbar. Der Zylinder 23 wird von einer Kammerrakel 25 mit Farbe versorgt. An einer freien Stelle des Umfangs des Zylinders 23 ist weiterhin eine Temperiereinrichtung 26 angeordnet. Die Temperiereinrichtung 26 besteht aus einem über die ganze Breite des Zylinders 23 durchlaufenden Widerstandsheizstab. Falls gewünscht, kann der Heizstab auch in zonenbreite einzeln ein- und ausschaltbare Heizelemente unterteilt sein. Grundsätzlich besteht hier auch die Möglichkeit, eine Temperiereinrichtung entsprechend Fig. 1 zu verwenden. Eine damit gegebene Ansteuerung einzelner Näpfchen ist aber bei Rasterwalzen nicht immer erforderlich.6, a blanket cylinder 20, a plate cylinder 21 which can be covered with an offset printing plate, an application roller 22 with a flexible ink-accepting surface and a cylinder 23 serving as anilox roller are provided. A dampening unit 24 can be set on the plate cylinder 21. The cylinder 23 is supplied with ink by a doctor blade 25. A temperature control device 26 is also arranged at a free location on the circumference of the cylinder 23. The temperature control device 26 consists of a resistance heating element which extends over the entire width of the cylinder 23. If desired, the heating element can also be divided into zone-wide heating elements that can be switched on and off individually. Basically, there is also the possibility of using a temperature control device according to FIG. 1. A given control of individual cells is not always necessary with anilox rollers.

Der Zylinder 23 weist, wie die Fig. 7 und 8 zeigen, einen harten metallischen Kern 27 auf, auf den eine Schicht 28 aus einem Werkstoff mit einem temperaturabhängigen Formgedächtnis aufgebracht ist. Die Schicht 28 ist als poröse Schicht zweckmäßig durch Plasmasprühen aufgebracht. Sie wird nach ihrem Aufbringen durch spannlose Verformung mit Näpfchen 29, vgl. Fig. 7, versehen. Hierdurch wird gleichzeitig sichergestellt, daß die Außenseite der Schicht 28 geschlossen durchläuft. Das Einbringen der Näpfchen erfolgt dabei bei einer den ersten Formzustand definierenden Temperatur T 4. Anschließend wird die Temperatur der Schicht 28 auf den Wert T 2 gebracht, bei der sie den zweiten Formzustand annimmt. Hierauf wird den Näpfchen 29' des zweiten Formzustandes die gewünschte endgültige Form gegeben. Dies kann wiederum beispielsweise durch Molettieren erfolgen. Die innere Porosität der Schicht 28 im ersten Formzustand ist hierbei erforderlich, um eine Veränderung des Außendurchmessers bei Übergang zum zweiten Formzustand zu verhindern.7 and 8, the cylinder 23 has a hard metallic core 27 to which a layer 28 made of a material with a temperature-dependent shape memory is applied. The layer 28 is expediently applied as a porous layer by plasma spraying. After it has been applied, it is clamped by tensionless deformation with a cup 29, cf. Fig. 7 provided. This also ensures that the outside of the layer 28 passes through in a closed manner. The wells are introduced in a state defining the first shape Temperature T 4. Then the temperature of the layer 28 is brought to the value T 2, at which it assumes the second shape. The cells 29 'of the second shape state are then given the desired final shape. This can again be done, for example, by mettling. The inner porosity of the layer 28 in the first shape state is necessary in order to prevent a change in the outer diameter when changing to the second shape state.

Zum Abkühlen und zur Rückführung auf den Ausgangszustand besteht weiterhin die Möglichkeit, als Rasterwalze einen Zylinder 30 gemäß Fig. 9 und 10 zu verwenden. Der Zylinder 30 ist drehbar auf einer festen Achse 31 gelagert und weist wiederum eine auf einen metallischen Kern 32 aufgebrachte poröse Schicht 33 aus einem Werkstoff mit temperaturabhängigen Formgedächtnis auf. In die Schicht 33 sind Näpfchen 34 eingebracht. Der Zylinder 30 weist einen Innenhohlraum 35 auf, der über Bohrungen 36, 37 an einen Flüssigkeitskreislauf, beispielsweise einen Wasserkreislauf 38, angeschlossen ist. Im Wasserkreislauf 38 befindet sich ein Wärmetauscher 39, in dem das durchfließende Wasser abkühlt werden kann. Zur Aufrechterhaltung des Durchflusses ist im Wasserkreislauf 38 weiterhin eine Förderpumpe 40 vorgesehen. Falls erforderlich, kann neben diesem Wärmetauscher 39 noch ein zweiter Wärmetauscher zur Erhöhung der Temperatur des Wasserkreislaufes vorgesehen sein. Bei letzterer Ausführung wird eine Überführung der Schicht 33 vom einen in den anderen Formzustand durch Erwärmen des umlaufenden Wassers des Wasserkreislaufes 38 bewirkt. Zur Rückführung in den ersten Formzustand kann dann entweder das Wasser des Wasserkreislaufes gekühlt werden oder die Temperatur zum Erreichen des ersten Formzustandes liegt so, daß sie automatisch nach dem Abstellen der Druckmaschine erreicht wird.For cooling and for returning to the initial state, there is also the possibility of using a cylinder 30 as shown in FIGS. 9 and 10. The cylinder 30 is rotatably mounted on a fixed axis 31 and in turn has a porous layer 33 made of a material with a temperature-dependent shape memory that is applied to a metallic core 32. Cups 34 are introduced into the layer 33. The cylinder 30 has an inner cavity 35 which is connected to a liquid circuit, for example a water circuit 38, via bores 36, 37. In the water circuit 38 there is a heat exchanger 39 in which the water flowing through can be cooled. A feed pump 40 is also provided in the water circuit 38 to maintain the flow. If necessary, in addition to this heat exchanger 39, a second heat exchanger can also be provided to increase the temperature of the water cycle. In the latter embodiment, the layer 33 is transferred from one shape state to the other by heating the circulating water of the water circuit 38. To return to the first shape, either the water of the water cycle can be cooled or the temperature for reaching the first shape is such that it is reached automatically after the printing machine is switched off.

Fig. 11 zeigt eine weitere Beschichtung. Hier ist auf einen harten Kern 50 eines Zylinders eine poröse Schicht 51 aus einem Werkstoff mit einem temperaturabhängigen Formgedächtnis aufgebracht, sowie dies bei der Anordnung nach Fig. 7 und 8 der Fall ist. In der Schicht 51 sind Näpfchen vorgesehen, die im ersten Formzustand mit 53 und im zweiten Formzustand mit 53' bezeichnet sind. Zusätzlich ist außen auf die Schicht 51 eine elastisch verformbare Verschleißschutzschicht 52 aufgebracht. Die Verschleißschutzschicht 52 ist nur wenige µ dick und besteht zweckmäßig aus TiN, TiAlN oder TiCN.11 shows a further coating. Here, a porous layer 51 made of a material with a temperature-dependent shape memory is applied to a hard core 50 of a cylinder, as is the case with the arrangement according to FIGS. 7 and 8. Cups are provided in layer 51, which are in the first shape 53 and 53 'in the second form. In addition, an elastically deformable wear protection layer 52 is applied to the outside of the layer 51. The wear protection layer 52 is only a few μm thick and expediently consists of TiN, TiAlN or TiCN.

Eine weitere Variante zeigt Fig. 12. Bei dieser Anordnung sind in die Außenfläche eines harten Kernes 60 eines Zylinders Vertiefungen 61 eingearbeitet. Die Schicht 62 aus einem Werkstoff mit temperaturabhängigem Formgedächtnis ist als dünnwandige, auf den Kern aufgebrachte Hülse ausgebildet. In dem ersten in Fig. 12 links dargestellten Formzustand bildet somit die Schicht 62 einen Teil eines Zylindermantels. Nach Überführung der Schicht 62 in den zweiten Formzustand durch Erwärmung bilden sich im Bereich der Vertiefungen 61 Näpfchen 63. Dabei sind die Vertiefungen 61 so bemessen, daß sie die Näpfchen 63 bildende Schicht 62 aufnehmen. Diese Ausgestaltung ist nicht nur für Rasterwalzen sondern auch für Tiefdruckformzylinder geeignet. Grundsätzlich besteht bei dieser Variante auch die Möglichkeit, daß die Schicht 62 bereits im ersten Formzustand flachere Näpfchen bildet, sowie dies bei der Anordnung gemäß Fig. 7 und 8 der Fall ist. Dann ist sie für Rasterwalzen verwendbar.A further variant is shown in FIG. 12. In this arrangement, depressions 61 are machined into the outer surface of a hard core 60 of a cylinder. The layer 62 made of a material with a temperature-dependent shape memory is designed as a thin-walled sleeve applied to the core. In the first shape state shown on the left in FIG. 12, layer 62 thus forms part of a cylinder jacket. After the layer 62 has been brought into the second shape by heating, wells 63 form in the area of the depressions 61. The depressions 61 are dimensioned such that they accommodate the layer 62 forming the wells 63. This configuration is suitable not only for anilox rollers but also for gravure cylinders. Basically, in this variant there is also the possibility that the layer 62 forms flatter cells in the first shape, as is the case with the arrangement according to FIGS. 7 and 8. Then it can be used for anilox rollers.

Claims (10)

  1. Printing unit for a printing machine having an ink-carrying cylinder (1, 23, 30) provided with cells (11, 29, 34, 53, 63) and co-operating with a doctor blade (5, 25), on whose core (6, 27, 32, 50, 60) there is fixed at least one layer (8, 28, 33, 51, 62) made of a material with a temperature-dependent shape memory containing the cells (11, 29, 34, 53, 63), and having a tempering device (9, 26, 35 to 40), which can be switched on and off, for changing the temperature of this layer (8, 28, 33, 51, 62), characterised in that in two different temperature ranges the layer (8, 28, 33, 51, 62) has two different shape states without the requirement of further conditions.
  2. Printing unit according to claim 1, characterised in that between the layer (8) made of the material with temperature-dependent shape memory and the core (6) of the cylinder (1) there is arranged a porous, volume-changeable intermediate layer (7).
  3. Printing unit according to claim 2, characterised in that the intermediate layer (7) is also made of a material with temperature-dependent shape memory.
  4. Printing unit according to claim 1, characterised in that the layer (62) made of the material with temperature-dependent shape memory is constructed as a thin-walled sleeve applied to the core (60), the outer surface of the core (60) is provided with depressions (61), and the depressions (61) are dimensioned in accordance with the maximum cell size and arranged below the heat-deformable parts of the layer (62).
  5. Printing unit according to one of the preceding claims, characterised in that an elastically deformable wear-resistant layer (52) is applied to the layer (51) made of the material with temperature-dependent shape memory.
  6. Printing unit according to one of claims 1 to 5, characterised in that the cylinder (1) is a gravure forme cylinder.
  7. Printing unit according to one of claims 1 to 5, characterised in that the cylinder (23) is a screen roller of an inking unit.
  8. Printing unit according to one of the preceding claims, characterised in that the tempering device (9) comprises a plurality of adjacently arranged heating elements (10).
  9. Printing unit according to one of claims 1 to 8, characterised in that the tempering device (26) is made of heating elements of the width of a zone.
  10. Printing unit according to one of claims 1 to 9, characterised in that the cylinder (30) is of hollow construction and the inner hollow chamber (35) is connected to a liquid cycle which can be set to different temperatures.
EP90120395A 1989-11-18 1990-10-24 Printing unit Expired - Lifetime EP0428893B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3938449A DE3938449A1 (en) 1989-11-18 1989-11-18 PRINT WORK
DE3938449 1989-11-18

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EP0428893A2 EP0428893A2 (en) 1991-05-29
EP0428893A3 EP0428893A3 (en) 1991-12-11
EP0428893B1 true EP0428893B1 (en) 1995-10-04

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EP90120395A Expired - Lifetime EP0428893B1 (en) 1989-11-18 1990-10-24 Printing unit

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US (1) US5233921A (en)
EP (1) EP0428893B1 (en)
JP (1) JPH03176154A (en)
DE (2) DE3938449A1 (en)

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Also Published As

Publication number Publication date
US5233921A (en) 1993-08-10
EP0428893A2 (en) 1991-05-29
EP0428893A3 (en) 1991-12-11
DE3938449C2 (en) 1993-02-11
DE3938449A1 (en) 1991-05-23
JPH03176154A (en) 1991-07-31
DE59009741D1 (en) 1995-11-09

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