EP0223737B1 - Support for a lithographic printing plate - Google Patents

Support for a lithographic printing plate Download PDF

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Publication number
EP0223737B1
EP0223737B1 EP86810460A EP86810460A EP0223737B1 EP 0223737 B1 EP0223737 B1 EP 0223737B1 EP 86810460 A EP86810460 A EP 86810460A EP 86810460 A EP86810460 A EP 86810460A EP 0223737 B1 EP0223737 B1 EP 0223737B1
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EP
European Patent Office
Prior art keywords
alloy
content
printing plate
lithographic printing
support
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Expired
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EP86810460A
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German (de)
French (fr)
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EP0223737A1 (en
Inventor
Theodore J. Crona
Heinz Bichsel
Jürgen Timm
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Alcan Holdings Switzerland AG
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Schweizerische Aluminium AG
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Publication of EP0223737A1 publication Critical patent/EP0223737A1/en
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    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
    • B41N1/083—Printing plates or foils; Materials therefor metallic for lithographic printing made of aluminium or aluminium alloys or having such surface layers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • the invention relates to a support for a lithographic printing plate made from a rolled sheet consisting of an aluminum alloy with up to 2% iron.
  • a method for producing such a carrier is within the scope of the invention.
  • Lithographic printing plates generally consist of an aluminum sheet provided with a light-sensitive layer. This has to meet a number of requirements.
  • the printing plates clamped in high-speed rotary cylinders must have high tensile strength and breaking strength and must not fail mechanically even after a long period of operation of several hundred thousand passes.
  • the clamping conditions require high ductility. If the light-sensitive layer burns in, the aluminum sheet is exposed to temperatures of 220 to 270 ° C; Even after such a treatment, the sheet must have sufficient static and dynamic ability.
  • the sheet surface is roughened mechanically, chemically or electrolytically.
  • This roughening must not allow too large pores to arise, which would result in undefined absorption and release of hydraulic fluid.
  • the surface of the sheet must therefore be free of large intermetallic particles which have been separated out and also free of large accumulations of fine particles, since if they are roughened out they would leave correspondingly large pores.
  • AA 1050 with 99.5% Al
  • AA 1200 with 99.2% Al
  • AA 3003 with at least 1% Mn. While the AA 1050 and AA 1200 alloys have a good surface, but have too low a static and dynamic strength for many printing plate applications, the AA 3003 alloy leads to high strengths, but due to coarse precipitations and precipitation nests, it offers problems with higher print quality requirements.
  • Alloys with higher iron contents have also been proposed, for example in EP-A-67056 an aluminum alloy with at most 1.2% Fe, remainder aluminum and impurities in an amount of at most 0.15% each.
  • This document does not recommend even higher iron contents, since these lead to annoying coarse excretions;
  • it is recommended to use a composite as the printing plate carrier which uses the alloy mentioned only as a cover plate for a core material made of any aluminum alloy of higher strength.
  • An aluminum alloy for lithographic printing plates is known from JP-A-52 029 301, which contains 0.6 to 2% Fe, at most 0.15% Si, optionally at least 0.5% Mg, remainder aluminum and traces of contamination.
  • GB-A 1 241 673 discloses an alloy with 0.85% Fe, 0.5% Mn, the rest of commercially available aluminum with a degree of purity of 99% and impurities such as Mg, Cu, Ni, Zn, Si and Ti. The alloy becomes used for further processing by rolling and deep-drawing cans.
  • EP-A 170 078 (document according to Art. 54 (3) (4) EPC) an alloy with 1.6% Fe and 0.5% Mn is proposed for a lithographic printing plate, the remaining elements being a maximum of 0.35 % and the rest is aluminum. It is also mentioned therein that the tape is cast and the tape can be reduced to a thickness of about 0.3 mm by rolling.
  • the invention is therefore based on the object of providing a method for producing a support for lithographic printing plates from a rolled sheet made of an AIFe alloy which satisfies the high demands made on the mechanical properties and the surface quality or etchability without requiring complex additional operations . Furthermore, a method is to be created which leads to such carriers.
  • an alloy with 0.8 to 2.0% iron, 0.1 to 0.8% silicon, to 1.0% manganese, the sum of the Si and Mn contents between 0 , 3 and 1.3 is up to 0.5% copper, up to 0.8 magnesium, up to 2.0% zinc and up to 0.3% each, up to 1.0% in total, other components, the rest aluminum, in a band from 5 to 12 mm thick or by electromagnetic shaping with direct liquid cooling into a strand and processed into a sheet from 0.03 to 0.6 mm thick.
  • the alloy composition in particular the Fe, Mn and Si contents, it is possible to achieve high static and dynamic strengths of the printing plate support, even after a thermal load of up to 270 ° C during the treatment of the printing plate.
  • the selection according to the invention also leads to a uniformly fine surface structure necessary for chemical or electrolytic roughening.
  • the Als (Fe, Mn) phase that precipitates during casting remains stable due to this alloy composition and, unlike other Fe-rich aluminum alloys, is not converted into the undesired AisFe phase during subsequent heat treatments.
  • the ternary AIFeSi phase that also occurs is characterized by a fine structure. Without impairing the excellent behavior of the alloy, Cu, Mg or Zn can be added up to the specified maximum amount if the strength requirements are even higher.
  • the cooling conditions associated with the electromagnetic casting method lead to an additional refinement of the precipitation structure on the strand surface and then on the sheet metal surface, which results in an improved etching behavior in the sense of the task.
  • the carrier plate (E) according to the invention has both higher tensile strength and higher yield strength, and also higher elongation than the comparative plates (V1) and (V2).
  • the strength and yield strength of (E) are only exceeded by the comparative plate (V3), but this has a much lower elongation.
  • the sheets annealed for 3 hours at 270 ° C. show the different softening behavior of the variant (E) according to the invention on the one hand and the comparison variants (V1) and (V2) on the other; (E) has only a slightly lower elongation at break with higher strength and much higher yield strength.
  • the comparative sheet (V3) also exceeds (E) when annealed in terms of strength and yield strength and is considerably inferior to this in terms of elongation at break.
  • the carrier plate (E) corresponds to the comparison plate (V1).
  • the lateral spacing of the roughness peaks in (E) is, however, about 25% less than in (V1), expression of a finer surface structure.
  • the height difference between the highest peaks and the deepest valleys in (V1) is 25% greater than in (E) and therefore already poses an increased risk of uncontrolled deposits of hydraulic fluid.
  • the comparative plate (V3) has an average roughness which is about 50% higher; the maximum height difference is 125% above the corresponding value at (E) or 80% above (V1).
  • the carrier sheets according to the invention combine high static and dynamic strength and high ductility with excellent etching behavior.

Description

Die Erfindung betrifft einen Träger für eine lithographische Druckplatte aus einem Walzblech, bestehend aus einer Aluminium-Legierung mit bis zu 2% Eisen. Zudem liegt im Rahmen der Erfindung ein Verfahren zur Herstellung eines solchen Trägers.The invention relates to a support for a lithographic printing plate made from a rolled sheet consisting of an aluminum alloy with up to 2% iron. In addition, a method for producing such a carrier is within the scope of the invention.

Lithographische Druckplatten bestehen in der Regel aus einem mit einer lichtempfindlichen Schicht versehenen Aluminiumblech. Dieses muss einer Reihe von Anforderungen genügen. Die in schnellaufenden Rotationszylindern eingespannten Druckplatten müssen hohe Streck- und Bruchfestigkeiten aufweisen und dürfen auch nach einer langen Betriebsdauer von mehreren hunderttausend Durchgängen mechanisch nicht versagen. Die Einspannbedingungen verlangen eine hohe Duktilität. Ein allfälliges Einbrennen der lichtempfindlichen Schicht setzt das Aluminiumblech Temperaturen von 220 bis 270 °C aus; auch nach einer solchen Behandlung muss das Blech genügend hohe statische und dynamische Fertigkeit aufweisen. Um die Wasserführung beim Druck zu gewährleisten, um eine reflexionsarme gleichförmige Oberfläche zu erreichen, sowie um einen geeigneten Haftgrund für die Fotoschicht zu erstellen, wird die Blechoberfläche mechanisch, chemisch oder elektrolytisch aufgerauht. Diese Aufrauhung darf keine zu grossen Poren entstehen lassen, welche undefinierte Aufnahme und Abgabe von Druckflüssigkeit zur Folge hätten. Die Blechoberfläche muss deshalb frei von grossen ausgeschiedenen intermetallischen Partikeln und auch frei von grösseren Ansammlungen feiner Partikel sein, da eine Herauslösung derselben beim Aufrauhen entsprechend grosse Poren hinterliesse.Lithographic printing plates generally consist of an aluminum sheet provided with a light-sensitive layer. This has to meet a number of requirements. The printing plates clamped in high-speed rotary cylinders must have high tensile strength and breaking strength and must not fail mechanically even after a long period of operation of several hundred thousand passes. The clamping conditions require high ductility. If the light-sensitive layer burns in, the aluminum sheet is exposed to temperatures of 220 to 270 ° C; Even after such a treatment, the sheet must have sufficient static and dynamic ability. In order to ensure the water flow during printing, to achieve a low-reflection, uniform surface, and to create a suitable adhesive base for the photo layer, the sheet surface is roughened mechanically, chemically or electrolytically. This roughening must not allow too large pores to arise, which would result in undefined absorption and release of hydraulic fluid. The surface of the sheet must therefore be free of large intermetallic particles which have been separated out and also free of large accumulations of fine particles, since if they are roughened out they would leave correspondingly large pores.

Gebräuchliche Werkstoffe für Druckplattenbleche sind die Aluminiumlegierungen AA 1050 (mit 99.5% AI), AA 1200 (mit 99.2% Al) und AA 3003 (mit mindestens 1% Mn). Während die Legierungen AA 1050 und AA 1200 zwar eine gute Oberfläche, jedoch für viele Druckplattenanwendungen eine zu tiefe statische und dynamische Festigkeit aufweisen, führt die Legierung AA 3003 zu hohen Festigkeiten, bietet aber infolge grober Ausscheidungen und Ausscheidungsnestern Probleme bei höheren Druckqualitätsanforderungen.Common materials for printing plate sheets are the aluminum alloys AA 1050 (with 99.5% Al), AA 1200 (with 99.2% Al) and AA 3003 (with at least 1% Mn). While the AA 1050 and AA 1200 alloys have a good surface, but have too low a static and dynamic strength for many printing plate applications, the AA 3003 alloy leads to high strengths, but due to coarse precipitations and precipitation nests, it offers problems with higher print quality requirements.

Es wurden auch Legierungen mit höheren Eisengehalten vorgeschlagen, beispielsweise in der EP-A-67056 eine Aluminiumlegierung mit höchstens 1.2% Fe, Rest Aluminium und Verunreinigungen in einer Menge von jeweils höchstens 0.15%. Von noch höheren Eisengehalten wird in dieser Schrift abgeraten, da diese zu störenden groben Ausscheidungen führen; für eine weitere Festigkeitssteigerung wird jedoch empfohlen, als Druckplattenträger einen Verbund zu verwenden, welcher die genannte Legierung lediglich als Deckblech zu einem Kernmaterial aus einer beliebigen Aluminiumlegierung höherer Festigkeit einsetzt. Aus der JP-A-52 029 301 ist eine Aluminiumlegierung für lithographische Druckplatten bekannt, welche 0.6 bis 2% Fe, höchstens 0.15% Si, gegebenenfalls mindestens 0.5% Mg, Rest Aluminium und Verunreinigungsspuren enthält. Da aus einer Schmelze mit dieser Zusammensetzung gegossene Stranggussbarren an der Oberfläche A13Fe Partikel und im Barreninnern AIsFe - Partikel als Ausscheidungen aufweist, den AisFe - Partikeln jedoch eine gröbere ungünstigere Form als den AIsFe - Partikeln zu eigen ist, müssen diese Barren stark überfräst werden.Alloys with higher iron contents have also been proposed, for example in EP-A-67056 an aluminum alloy with at most 1.2% Fe, remainder aluminum and impurities in an amount of at most 0.15% each. This document does not recommend even higher iron contents, since these lead to annoying coarse excretions; For a further increase in strength, however, it is recommended to use a composite as the printing plate carrier, which uses the alloy mentioned only as a cover plate for a core material made of any aluminum alloy of higher strength. An aluminum alloy for lithographic printing plates is known from JP-A-52 029 301, which contains 0.6 to 2% Fe, at most 0.15% Si, optionally at least 0.5% Mg, remainder aluminum and traces of contamination. Since continuous cast ingots cast from a melt with this composition have A1 3 Fe particles on the surface and AIsFe particles as precipitates in the interior of the ingot, but the Ai s Fe particles have a coarser, more unfavorable shape than the AI s Fe particles, so they have to be Bars are heavily milled.

Die GB-A 1 241 673 offenbart eine Legierung mit 0,85% Fe, 0,5% Mn, Rest handelsübliches Aluminium mit einem Reinheitsgrad von 99% und Verunreinigungen wie Mg, Cu, Ni, Zn, Si und Ti. Die Legierung wird zum Weiterverarbeiten durch Walzen und Tiefziehen von Dosen verwendet.GB-A 1 241 673 discloses an alloy with 0.85% Fe, 0.5% Mn, the rest of commercially available aluminum with a degree of purity of 99% and impurities such as Mg, Cu, Ni, Zn, Si and Ti. The alloy becomes used for further processing by rolling and deep-drawing cans.

In der EP-A 170 078 (Dokument nach Art. 54 (3) (4) EPü) wird für eine lithographische Druckplatte eine Legierung mit 1,6% Fe und 0,5% Mn vorgeschlagen, wobei die übrigen Elemente maximal 0,35% betragen und der Rest Aluminium ist. Es ist darin auch erwähnt, daß ein Bandguß erfolgen und das Band durch Walzen auf eine Dicke von etwa 0,3 mm reduziert werden kann.In EP-A 170 078 (document according to Art. 54 (3) (4) EPC) an alloy with 1.6% Fe and 0.5% Mn is proposed for a lithographic printing plate, the remaining elements being a maximum of 0.35 % and the rest is aluminum. It is also mentioned therein that the tape is cast and the tape can be reduced to a thickness of about 0.3 mm by rolling.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Trägers für lithographische Druckplatten aus einem Walzblech aus einer AIFe-Legierung bereitzustellen, welcher den genannten hohen Anforderungen an die mechanischen Eigenschaften und die Oberflächenbeschaffenheit bzw. Ätzbarkeit genügt, ohne hierzu aufwendige Zusatzoperationen zu erfordern. Weiter soll ein Verfahren geschaffen werden, welches zu solchen Trägern führt.The invention is therefore based on the object of providing a method for producing a support for lithographic printing plates from a rolled sheet made of an AIFe alloy which satisfies the high demands made on the mechanical properties and the surface quality or etchability without requiring complex additional operations . Furthermore, a method is to be created which leads to such carriers.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß eine Legierung mit 0,8 bis 2,0% Eisen, 0,1 bis 0,8% Silizium, bis 1,0% Mangan, wobei die Summe der Si- und Mn-Gehalte zwischen 0,3 und 1,3 liegt, bis 0,5% Kupfer, bis 0,8 Magnesium, bis 2,0% Zink und je bis 0,3%, insgesamt bis 1,0% andere Bestandteile, Rest Aluminium, zu einem Band von 5 bis 12 mm Dicke oder durch elektromagnetische Formgebung mit direkter Flüssigkeitskühlung zu einem Strang vergossen und zu einem Walzblech von 0,03 bis 0,6 mm Dicke verarbeitet wird.According to the invention the object is achieved in that an alloy with 0.8 to 2.0% iron, 0.1 to 0.8% silicon, to 1.0% manganese, the sum of the Si and Mn contents between 0 , 3 and 1.3 is up to 0.5% copper, up to 0.8 magnesium, up to 2.0% zinc and up to 0.3% each, up to 1.0% in total, other components, the rest aluminum, in a band from 5 to 12 mm thick or by electromagnetic shaping with direct liquid cooling into a strand and processed into a sheet from 0.03 to 0.6 mm thick.

Durch die Auswahl der Legierungszusammensetzung, insbesondere der Fe-, Mn- und Si-Gehalte, gelingt es, hohe statische und dynamische Festigkeiten des Druckplattenträgers, auch nach einer thermischen Belastung von bis 270°C bei der Behandlung der Druckplatte, zu erreichen. Die erfindungsgemäße Auswahl führt zudem zu einer für die chemische oder elektrolytische Aufrauhung nötige, gleichmässig feine Oberflächenstruktur. Die beim Gießen sich ausscheidende Als(Fe,Mn)-Phase bleibt aufgrund dieser Legierungszusammensetzung stabil und wird nicht, wie bei anderen Fe-reichen Aluminiumlegierungen, bei folgenden Wärmebehandlungen in die unerwünschte AisFe-Phase umgewandelt. Die zudem auftretende ternäre AIFeSi-Phase zeichnet sich durch eine feine Struktur aus. Ohne das vorzügliche Verhalten der Legierung zu beeinträchtigen, kann bei allfällig noch höher liegenden Festigkeitsanforderungen Cu, Mg oder Zn bis zur angegebenen Höchstmenge zulegiert werden.By selecting the alloy composition, in particular the Fe, Mn and Si contents, it is possible to achieve high static and dynamic strengths of the printing plate support, even after a thermal load of up to 270 ° C during the treatment of the printing plate. The selection according to the invention also leads to a uniformly fine surface structure necessary for chemical or electrolytic roughening. The Als (Fe, Mn) phase that precipitates during casting remains stable due to this alloy composition and, unlike other Fe-rich aluminum alloys, is not converted into the undesired AisFe phase during subsequent heat treatments. The ternary AIFeSi phase that also occurs is characterized by a fine structure. Without impairing the excellent behavior of the alloy, Cu, Mg or Zn can be added up to the specified maximum amount if the strength requirements are even higher.

Als vorteilhaft hat sich erwiesen, einen Fe-Gehalt zwischen 1,1 und 1,8%, einen Mn-Gehalt zwischen 0,25 und 0,6%, einen Si-Gehalt zwischen 0,1 und 0,4% sowie einen Cu-Gehalt von höchstens 0,3% zu wählen. Besonders geeignet sind Träger, deren Gewichtsverhältnis Fe-Gehalt zu Mn-Gehalt zwischen 2,5 und 4,5 liegt.It has proven to be advantageous to have an Fe content between 1.1 and 1.8%, a Mn content between 0.25 and 0.6%, an Si content between 0.1 and 0.4% and a Cu Content of at most 0.3% to choose. Carriers whose weight ratio Fe content to Mn content is between 2.5 and 4.5 are particularly suitable.

Die beim Bandgiessen herrschenden Bedingung lassen die Vorzüge der Legierungszusammensetzung sich voll entwickeln. Hierzu eignen sich insbesondere Gießanlagen, bei welchen die Schmelze dem Spalt zwischen zwei innengekühlten Walzen zugeführt wird.The conditions prevailing in strip casting allow the advantages of the alloy composition to be fully developed. Casting plants in which the melt is fed into the gap between two internally cooled rolls are particularly suitable for this purpose.

Die mit der elektromagnetischen Gießmethode verbundenen Abkühlbedingungen führen bei der Strang- und sodann bei der Blechoberfläche zu einer zusätzlichen Verfeinerung der Ausscheidungsstruktur, was ein verbessertes Atzverhalten im Sinne der Aufgabe zur Folge hat.The cooling conditions associated with the electromagnetic casting method lead to an additional refinement of the precipitation structure on the strand surface and then on the sheet metal surface, which results in an improved etching behavior in the sense of the task.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels.Further advantages, features and details of the invention emerge from the following description of a preferred exemplary embodiment.

Zum Vergleich mit konventionellen Druckplattenträger wurde ein Stranggußbarren der erfindungsgemäßen Zusammensetzung (E) und 3 konventioneller Zusammensetzungen (V1, V2 und V3) an 4,2 mm warmgewalzt und anschließend über 1,1 mm an 0,25 mm kaltgewalzt (Tab. 1). Alle 4 Muster wurden elektrolytisch aufgerauht, gebeizt und anodisch oxidiert. Die Rauhigkeit dieser Trägerbleche wurde ausgemeßen (Tab. 4).For comparison with conventional printing plate supports, a continuous cast ingot of the composition (E) according to the invention and 3 conventional compositions (V1, V2 and V3) was hot-rolled to 4.2 mm and then cold-rolled to 1.15 mm to 0.25 mm (Table 1). All 4 samples were roughened electrolytically, pickled and anodized. The roughness of these carrier sheets was measured (Tab. 4).

Zudem wurde ein Teil der 0,25 mm dicken Bleche einer Glühung von 270°C während 3 Stunden ausgesetzt. Sowohl an den walzharten als auch an den geglühten Proben wurden Zugversuche durchgeführt (Tab. 2). Zur Bestimmung der Biegefestigkeit wuden bei einer Zwischendicke von 1,1 mm Blechproben entnommen, welche einer Wechselbelastung von 100 MPa bis zum Bruch ausgesetzt wurden (Tab. 3).In addition, part of the 0.25 mm thick sheets were subjected to an annealing of 270 ° C. for 3 hours. Tensile tests were carried out on both the hard-rolled and the annealed specimens (Tab. 2). To determine the bending strength, sheet metal samples were taken at an intermediate thickness of 1.1 mm, which were subjected to an alternating load of 100 MPa until breakage (Tab. 3).

Das Resultat der Zugproben zeigt, dass im walzharten Zustand das erfindungsgemässe Trägerblech (E) sowohl höhere Zugfestigkeit und höhere Streckgrenze, als auch höhere Dehnung als die Vergleichsbleche (V1) und (V2) aufweist. Festigkeit und Streckgrenze von (E) wird nur durch das Vergleichsblech (V3) übertroffen, dieses weist jedoch eine wesentlich tiefere Dehnung auf. Die während 3 Stunden bei 270 °C geglühten Bleche zeigen das unterschiedliche Entfestigungsverhalten der ertindungsgemässen Variante (E) einerseits und der Vergleichsvarianten (V1) und (V2) andererseits; (E) weist bei höherer Festigkeit und wesentlich höherer Streckgrenze eine nur geringfügig kleinere Bruchdehnung auf. Das Vergleichsblech (V3) übertrifft (E) auch im geglühten Zustand bzgl. Festigkeit und Streckgrenze und steht diesem bzgl. Bruchdehnung erheblich nach.The result of the tensile tests shows that in the hard-rolled state, the carrier plate (E) according to the invention has both higher tensile strength and higher yield strength, and also higher elongation than the comparative plates (V1) and (V2). The strength and yield strength of (E) are only exceeded by the comparative plate (V3), but this has a much lower elongation. The sheets annealed for 3 hours at 270 ° C. show the different softening behavior of the variant (E) according to the invention on the one hand and the comparison variants (V1) and (V2) on the other; (E) has only a slightly lower elongation at break with higher strength and much higher yield strength. The comparative sheet (V3) also exceeds (E) when annealed in terms of strength and yield strength and is considerably inferior to this in terms of elongation at break.

Das angesichts der Einsatzbedingungen lithographischer Druckplatten bedeutungsvolle dynamische Verhalten der Trägerbleche wird durch das Resultat der Biegewechselfestigkeitsversuche demonstriert. Die Anzahl Lastspiele bis zum Bruch liegen bei der Variante (E) um 25% höher als bei der Vergleichsvariante (V1).The dynamic behavior of the carrier plates, which is significant in view of the conditions of use of lithographic printing plates, is demonstrated by the result of the fatigue strength tests. The number of load cycles until breakage is 25% higher in variant (E) than in comparison variant (V1).

Die aufgabengemässe Aetzbarkeit wurde durch eine Rauhigkeitsmessung der behandelten Trägerbleche quantifiziert. Bezüglich der mittleren Rauhigkeit entspricht das erfindungsgemässe Trägerblech (E) dem Vergleichsblech (V1). Der laterale Abstand der Rauhigkeitsspitzen ist bei (E) jedoch um etwa 25% geringer als bei (V1), Ausdruck einer feineren Oberflächenstruktur. Die Höhendifferenz zwischen den höchsten Spitzen und den tiefsten Tälern ist bei (V1) um 25% grösser als bei (E) und birgt somit bereits eine erhöhte Gefahr unkontrollierter Ablagerungen von Druckflüssigkeit. Das Vergleichsblech (V3) schliesslich, weist eine etwa 50% höhere mittlere Rauhigkeit auf; die maximale Höhendifferenz liegt gar um 125% oberhalb des entsprechenden Wertes bei (E) bzw. 80% oberhalb (V1). Diese Messungen bestätigen die aus Druckversuchen bekannte schlechtere Druckqualität mit der für (V3) eingesetzten Legierung AA 3003 im Vergleich mit der für (V1) eingesetzten Legierung AA 1200, sodass bei hohen Druckqualitäts-Anforderungen die Legierung AA 3003 trotz ihrer hohen Festigkeit gemieden wird.The suitability for etching was quantified by measuring the roughness of the treated carrier plates. With regard to the average roughness, the carrier plate (E) according to the invention corresponds to the comparison plate (V1). The lateral spacing of the roughness peaks in (E) is, however, about 25% less than in (V1), expression of a finer surface structure. The height difference between the highest peaks and the deepest valleys in (V1) is 25% greater than in (E) and therefore already poses an increased risk of uncontrolled deposits of hydraulic fluid. Finally, the comparative plate (V3) has an average roughness which is about 50% higher; the maximum height difference is 125% above the corresponding value at (E) or 80% above (V1). These measurements confirm the poorer print quality known from printing tests with the AA 3003 alloy used for (V3) compared to the AA 1200 alloy used for (V1), so that the AA 3003 alloy is avoided in spite of its high strength in the case of high print quality requirements.

Die erfindungsgemässen Trägerbleche jedoch vereinen hohe statische und dynamische Festigkeit und hohe Duktilität mit vorzüglichem Aetzverhalten.

Figure imgb0001
Figure imgb0002
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Figure imgb0004
 However, the carrier sheets according to the invention combine high static and dynamic strength and high ductility with excellent etching behavior.
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Claims (4)

1. Process for the production of a support for a lithographic printing plate from a rolled sheet consisting of a AIFe alloy, characterized in that an alloy containing 0.8 to 2.0% iron, 0.1 to 0.8% silicon and up to 1.0% manganese, the sum of the silicon and manganese contents being between 0.3 and 1.3%, up to 0.5% copper, up to 0.8% magnesium, up to 2.0% zinc, and other constituents, in each case up to 0.3% and in total up to 1.0%, and remainder aluminium is cast into a strip 5 to 12 mm thick and processed to a rolled sheet 0.03 to 0.6 mm thick.
2. Process for the production of a support for a lithographic printing plate from a rolled sheet consisting of a AIFe alloy, characterized in that an alloy containing 0,8 to 2,0% iron, 0,1 to 0,8% silicon and up to 1,0% manganese, the sum of the silicon and manganese contents being between 0,3 and 1,3%, up to 0,5% copper, up to 0,8% magnesium, up to 2,0% zinc, and other constituents, in each case up to 0,3% and in total up to 1,0%, and remainder aluminium is cast by electromagnetic shaping with direct liquid cooling into a bar and processed to a rolled sheet 0,03 to 0,6 mm thick.
3. Process according to claim 1 or 2, that (sic) an alloy with a Fe content of 1.1 to 1.8%, a Mn content of 0.25 to 0.6%, a Si content of 0.1 to 0.4% and a Cu content of at most 0.3% is processed.
4. Process according to claim 3, characterized in that the weight ratio of Fe content to Mn content is between 2.5 and 4.5.
EP86810460A 1985-10-30 1986-10-17 Support for a lithographic printing plate Expired EP0223737B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH466885 1985-10-30
CH4668/85 1985-10-30

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EP0223737A1 EP0223737A1 (en) 1987-05-27
EP0223737B1 true EP0223737B1 (en) 1989-12-27

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EP1712368A1 (en) 2005-04-13 2006-10-18 Fuji Photo Film Co., Ltd. Method of manufacturing a support for a lithographic printing plate
WO2010150810A1 (en) 2009-06-26 2010-12-29 富士フイルム株式会社 Light reflecting substrate and process for manufacture thereof
WO2011078010A1 (en) 2009-12-25 2011-06-30 富士フイルム株式会社 Insulated substrate, process for production of insulated substrate, process for formation of wiring line, wiring substrate, and light-emitting element

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US5188032A (en) * 1988-08-19 1993-02-23 Presstek, Inc. Metal-based lithographic plate constructions and methods of making same
JP2767711B2 (en) * 1989-08-22 1998-06-18 富士写真フイルム株式会社 Method for producing a lithographic printing plate support
US5350010A (en) * 1992-07-31 1994-09-27 Fuji Photo Film Co., Ltd. Method of producing planographic printing plate support
US5462614A (en) * 1993-03-09 1995-10-31 Fuji Photo Film Co., Ltd. Method of producing support for planographic printing plate
US5380379A (en) * 1993-08-18 1995-01-10 Alcoa Aluminio Do Nordeste S.A. Aluminum foil product and manufacturing method
JP3454578B2 (en) * 1993-08-31 2003-10-06 日本軽金属株式会社 Aluminum alloy base plate for lithographic printing plate and method for producing the same
US5534356A (en) * 1995-04-26 1996-07-09 Olin Corporation Anodized aluminum substrate having increased breakdown voltage
US5820015A (en) * 1996-04-02 1998-10-13 Kaiser Aluminum & Chemical Corporation Process for improving the fillet-forming capability of brazeable aluminum articles
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EP0821074A1 (en) * 1996-07-25 1998-01-28 Alusuisse Technology & Management AG Process for producing a strip of an aluminium alloy for lithographic printing plates
US6238497B1 (en) 1998-07-23 2001-05-29 Alcan International Limited High thermal conductivity aluminum fin alloys
US6592688B2 (en) * 1998-07-23 2003-07-15 Alcan International Limited High conductivity aluminum fin alloy
US6165291A (en) * 1998-07-23 2000-12-26 Alcan International Limited Process of producing aluminum fin alloy
FR2813316B1 (en) * 2000-08-29 2002-10-18 Pechiney Rhenalu PROCESS FOR PRODUCING VERY THIN STRIPS OF ALUMINUM-IRON ALLOY
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US20050260934A1 (en) * 2002-07-03 2005-11-24 Agfa-Gevaert Positive-working lithographic printing plate precursor
US20040086417A1 (en) * 2002-08-01 2004-05-06 Baumann Stephen F. High conductivity bare aluminum finstock and related process
JP4410714B2 (en) 2004-08-13 2010-02-03 富士フイルム株式会社 Method for producing support for lithographic printing plate
CN102165106B (en) 2008-09-30 2014-09-17 富士胶片株式会社 Electrolytic treatment method and electrolytic treatment device
WO2010127903A1 (en) 2009-05-08 2010-11-11 Novelis Inc. Aluminium lithographic sheet
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EP1712368A1 (en) 2005-04-13 2006-10-18 Fuji Photo Film Co., Ltd. Method of manufacturing a support for a lithographic printing plate
WO2010150810A1 (en) 2009-06-26 2010-12-29 富士フイルム株式会社 Light reflecting substrate and process for manufacture thereof
WO2011078010A1 (en) 2009-12-25 2011-06-30 富士フイルム株式会社 Insulated substrate, process for production of insulated substrate, process for formation of wiring line, wiring substrate, and light-emitting element

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US4800950A (en) 1989-01-31
CA1305615C (en) 1992-07-28
US4802935A (en) 1989-02-07
DE3667797D1 (en) 1990-02-01
EP0223737A1 (en) 1987-05-27

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