EP2067871B1 - Aluminium strip for lithographic pressure plate carriers and its manufacture - Google Patents

Aluminium strip for lithographic pressure plate carriers and its manufacture Download PDF

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Publication number
EP2067871B1
EP2067871B1 EP07023245A EP07023245A EP2067871B1 EP 2067871 B1 EP2067871 B1 EP 2067871B1 EP 07023245 A EP07023245 A EP 07023245A EP 07023245 A EP07023245 A EP 07023245A EP 2067871 B1 EP2067871 B1 EP 2067871B1
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EP
European Patent Office
Prior art keywords
aluminium
content
aluminium strip
strip
weight
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EP07023245A
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German (de)
French (fr)
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EP2067871A1 (en
EP2067871B2 (en
Inventor
Bernhard Kernig
Henk-Jan Brinkman
Jochen Hasenclever
Gerd Steinhoff
Christoph Settele
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Speira GmbH
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Hydro Aluminium Rolled Products GmbH
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Application filed by Hydro Aluminium Rolled Products GmbH filed Critical Hydro Aluminium Rolled Products GmbH
Priority to SI200731221T priority Critical patent/SI2067871T2/en
Priority to ES07023245T priority patent/ES2407655T5/en
Priority to EP07023245.9A priority patent/EP2067871B2/en
Priority to DE202008018332U priority patent/DE202008018332U1/en
Priority to PCT/EP2008/066086 priority patent/WO2009068502A1/en
Priority to CN2008801185883A priority patent/CN101883876A/en
Priority to JP2010535350A priority patent/JP5319693B2/en
Priority to EP08853549.7A priority patent/EP2220262B1/en
Priority to ES08853549.7T priority patent/ES2456269T3/en
Priority to BRPI0819596A priority patent/BRPI0819596B8/en
Publication of EP2067871A1 publication Critical patent/EP2067871A1/en
Publication of EP2067871B1 publication Critical patent/EP2067871B1/en
Priority to US15/494,285 priority patent/US11326232B2/en
Publication of EP2067871B2 publication Critical patent/EP2067871B2/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING 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
    • B41N1/00Printing plates or foils; Materials therefor
    • B41N1/04Printing plates or foils; Materials therefor metallic
    • B41N1/08Printing plates or foils; Materials therefor metallic for lithographic printing
    • B41N1/083Printing plates or foils; Materials therefor metallic for lithographic printing made of aluminium or aluminium alloys or having such surface layers
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12431Foil or filament smaller than 6 mils

Definitions

  • the invention relates to a process for producing aluminum strips for lithographic printing plate supports, wherein the aluminum strip is produced from a rolling bar, which after optional homogenization hot rolled to a thickness of 2 mm to 7 mm and to a final thickness of 0.15 mm to 0.5 mm cold rolled.
  • the invention relates to a correspondingly produced aluminum strip having a thickness of 0.15 mm to 0.5 mm and a pressure plate carrier made of the aluminum strip according to the invention.
  • the aluminum strip for the production of lithographic printing plate supports is usually subjected to an electrochemical roughening, which should result in a blanket roughening and a structureless appearance without streaking effects.
  • the roughened structure is important for applying a photosensitive layer, which is subsequently exposed.
  • the photo-layer is baked at temperatures of 220 ° C to 300 ° C and annealing times of 3 to 10 minutes, typical combinations of burn-in times being for example 240 ° C at 10 minutes, 260 ° C at 6 minutes and 260 ° C for 4 minutes.
  • the pressure plate carrier must after burning as possible lose little strength, so that it is still easy to handle and can be easily clamped in a printing device.
  • the printing plate support and thus also the correspondingly produced aluminum strip must have the highest possible flexural fatigue strength, so that plate outlier can be virtually eliminated due to mechanical stresses on the printing plate. So far, these requirements have been well met with conventional aluminum strips.
  • the handling of large lithographic printing plate supports becomes more difficult with increasing size and consistent strength values.
  • the present invention has the object to provide a method for producing an aluminum strip for lithographic printing plate support and a corresponding aluminum strip available, the coil set is easily correctable in hard-rolling condition and from which also oversized printing plate support can be produced, which is easy to handle and only show a low tendency to plate tears.
  • Residual Al and unavoidable impurities individually max. 0.05%, in total max. 0.15%, during the cold rolling an intermediate annealing is carried out at a thickness of 1.5 mm to 0.5 mm, the aluminum strip is then rolled by cold rolling to a final thickness of 0.15 mm to 0.5 mm and for further processing to one lithographic printing plate support is rolled up in hard-rolled condition.
  • the aluminum strip produced according to the invention can provide a moderate increase in strength together with a very high flexural fatigue resistance and at the same time very good thermal stability. Coilset corrections are possible without difficulty due to the moderate increase in strength. At the same time, however, the handling of the printing plate even in a baked state, for example when clamping in the printing press, is simple, since a good thermal stability of the aluminum strip is obtained by the method according to the invention. If the aluminum strip is used for the production of very large lithographic printing plate supports, preferably the aluminum strip is cold rolled to a final thickness of 0.25 to 0.5 mm after the intermediate annealing.
  • the properties according to the invention can be achieved particularly reliably by the fact that the aluminum alloy additionally has a titanium (Ti) content of max. 0.05% by weight, preferably max. 0.015 wt .-%, a zinc (Zn) content of max. 0.05 wt .-% and a chromium (Cr) content Content of less than 100 ppm, preferably a Cr content of max. 50 ppm. Titanium is commonly used for grain refining during casting. However, an increased Ti content leads to casting problems. Zinc affects the Aufrauley, so that its content max. Should be 0.05 wt .-%.
  • Chromium is recrystallization inhibiting and should therefore only in very small proportions of less than 100 ppm, preferably of max. 50 ppm contained in the aluminum alloy.
  • the aluminum alloy according to the present invention has an Mg content of 0.25 wt% to 0.6 wt%, preferably 0.25 to 0.4 wt%.
  • Mg content 0.25 wt% to 0.6 wt%, preferably 0.25 to 0.4 wt%.
  • the hot strip end temperature is 280 ° C to 350 ° C, a continuous recrystallization of the surface is achieved during hot rolling, which, for example, a good Aufrauley the wall surface during the production of lithographic Pressure plate carrier guaranteed.
  • the metal temperature of the aluminum strip is 200 ° C to 450 ° C.
  • the aluminum band will then be for at least one to two Hours kept at the metal temperature. This is usually done in batch ovens. Due to the intermediate annealing in the temperature range mentioned, the further processing of the aluminum strip can take place either in a recovered or recrystallized state or a combination of both.
  • the recrystallization starts at temperatures of about 300 to 350 ° C, which depends on the manufacturing parameters, in particular the introduced solidifications.
  • a regeneration annealing at lower temperatures merely results in a reduction of the solidifications, so that very low degrees of reduction after recovery annealing are possible.
  • the aluminum strip has a tensile strength of up to 200 MPa in hard-rolled condition along the rolling direction and after baking at a temperature of 240 ° C and a duration of 10 minutes of at least 145 MPa, as well as a bending resistance transverse to the rolling direction of at least 1850 cycles in the bending cycle test.
  • the aluminum strips according to the invention achieve bending cycle cycles of more than 1850, also transverse to the rolling direction, which means an increase of more than 70% compared with the standard alloys used hitherto. Due to the moderate increase in tensile strength measured to values up to 200 MPa in hard-rolling condition along the rolling direction, the coil set of the aluminum strip according to the invention can be further corrected in a simple manner.
  • the handling of the lithographic printing plate carrier produced from the aluminum strip is also good after a baking process. Even with very large lithographic printing plate supports can be facilitated by the increased strength after baking, the handling of the printing plates.
  • the high number of possible bending cycle cycles greater than 1850 both in the hard as well as in the baked state of the aluminum strip according to the invention that the tendency to As a result of mechanical stresses, plate cracks are small in the case of lithographic printing plate supports clamped transversely or longitudinally to the rolling direction.
  • the properties of the finished aluminum strip are thereby achieved process reliable, that the aluminum alloy has a Ti content of max. 0.05% by weight, preferably max. 0.015 wt .-%, a Zn content of max. 0.05 wt .-% and a Cr content of less than 100 ppm, preferably of max. 10 ppm.
  • the object indicated above is achieved by pressure plate carriers which are produced from an aluminum strip according to the invention.
  • the advantages of the pressure plate carrier according to the invention is based on the above statements on the method for producing a Referenced aluminum strip and the aluminum strip according to the invention.
  • the single figure shows a schematic representation of the bending cycle test for testing the bending fatigue resistance.
  • Table 1 shows only the essential alloying constituents of the aluminum tapes tested, moreover, the various experimental alloys had a Ti content of less than 0.015 wt%, a Zn content of less than 0.05 wt%, and a Cr content of less than 100 ppm.
  • the ingots cast from the various aluminum alloys have been subjected to homogenization prior to rolling, the ingots being annealed to a temperature of about 580 ° C for more than four hours. Subsequently, the hot rolling was carried out at temperatures of 250 ° C to 550 ° C, the hot strip temperature was between 280 ° C and 350 ° C.
  • the VRef alloy aluminum hot strip was subjected to intermediate annealing during cold rolling at a thickness of 2 to 2.4 mm, with the cold rolled strip being exposed to a temperature of 300 to 450 ° C for one to two hours.
  • the intermediate annealing thickness for the other aluminum strips was only 0.9 to 1.2 mm, as can be seen from Table 2 is. Since the intermediate annealed strips were further cold rolled to final thickness, without a final final annealing, they were coiled up hard as a condition. Tab. 2 Leg.-Nr.
  • the correspondingly produced aluminum strips for lithographic printing plate supports or litho tapes were subjected to further tests. All four aluminum bands are characterized by a very good roughening behavior.
  • the tensile strength in the hard-rolled state was investigated. In order to test the practical handling of the printing plates, especially for oversized lithographic printing plates, tensile strengths were measured even after a baking process of 240 ° C for 10 minutes. In addition, a bending change test was carried out in which the in Fig. 1 schematically illustrated experimental design was used.
  • Fig. 1a shows in a schematic sectional view of the structure of the bending change test device 1 used, which was used to investigate the flexural fatigue resistance of the aluminum strips according to the invention.
  • Samples 2 from the produced aluminum strips for lithographic printing plate supports are described in US Pat Segment 3 and a fixed segment 4 attached. The segment is reciprocated on the fixed segment 4 by a rolling motion in the bending change test, so that the sample 2 is subjected to bends perpendicular to the extension of the sample 2.
  • the different bending states shows schematically Fig. 1b ). Samples 2 were cut either longitudinally or transversely to the rolling direction from the prepared aluminum platens for lithographic printing plate supports. The radius of the segments 3,4 was 30 mm.
  • the conventional aluminum strip has a tensile strength which is sufficient for the correction of the coil set prior to the stoving process and for the handling of the lithographic printing plate support after the stoving process as well as a sufficient resistance to flexing along the rolling direction.
  • the conventionally manufactured aluminum strip VRef
  • the aluminum strip V582 according to the invention shows very good tensile strengths with regard to coil set correction and handling of the printing plate after a burn-in process as well as a very high bending fatigue resistance. Up to 78% higher number of bending cycles were achieved, alloy V582.
  • the comparative aluminum tape V580 also showed good values with respect to flexural fatigue resistance.
  • the very high tensile strengths of 218 and 228 MPa respectively longitudinal and transverse to the rolling direction, complicates the correction of the coil set prior to baking the photo layer of the lithographic printing plate supports.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
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Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Aluminiumbändern für lithografische Druckplattenträger, wobei das Aluminiumband aus einem Walzbarren hergestellt wird, welcher nach einem optionalen Homogenisieren auf eine Dicke von 2 mm bis 7 mm warmgewalzt und auf eine Enddicke von 0,15 mm bis 0,5 mm kaltgewalzt wird. Daneben betrifft die Erfindung ein entsprechend hergestelltes Aluminiumband mit einer Dicke von 0,15 mm bis 0,5 mm sowie einen Druckplattenträger hergestellt aus dem erfindungsgemäßen Aluminiumband.The invention relates to a process for producing aluminum strips for lithographic printing plate supports, wherein the aluminum strip is produced from a rolling bar, which after optional homogenization hot rolled to a thickness of 2 mm to 7 mm and to a final thickness of 0.15 mm to 0.5 mm cold rolled. In addition, the invention relates to a correspondingly produced aluminum strip having a thickness of 0.15 mm to 0.5 mm and a pressure plate carrier made of the aluminum strip according to the invention.

An die Qualität von Aluminiumbändern für die Herstellung von lithografischen Druckplattenträgern werden sehr hohe Anforderungen gestellt. Das Aluminiumband zur Herstellung von lithografischen Druckplattenträgern wird üblicherweise einer elektrochemischen Aufrauung unterzogen, welche eine flächendeckende Aufrauung und ein strukturloses Aussehen ohne Streifigkeitseffekte zur Folge haben sollte. Die aufgeraute Struktur ist wichtig für das Aufbringen einer fotosensitiven Schicht, welche anschließend belichtet wird. Die Fotoschicht wird bei Temperaturen von 220 °C bis 300 °C und Glühzeiten von 3 bis 10 Minuten eingebrannt, wobei typische Kombinationen von Einbrennzeiten beispielsweise 240 °C bei 10 Minuten, 260 °C bei 6 Minuten und 260 °C für 4 Minuten darstellen. Der Druckplattenträger muss nach dem Einbrennen möglichst wenig an Festigkeit verlieren, so dass dieser noch gut handhabbar ist und leicht in eine Druckvorrichtung eingespannt werden kann. Gleichzeitig muss der Druckplattenträger und damit auch das entsprechend herzustellende Aluminiumband eine möglichst hohe Biegewechselfestigkeit besitzen, so dass Plattenausreißer aufgrund von mechanischen Belastungen der Druckplatte nahezu ausgeschlossen werden können. Bisher konnten diese Anforderungen mit konventionellen Aluminiumbändern gut erfüllt werden. Zur Steigerung der Produktivität werden aber zunehmend Druckmaschinen eingesetzt, welche es erfordern, dass die Druckplattenträger derart eingespannt werden, dass sie quer zur Walzrichtung gebogen und daher auch quer zur walzrichtung mechanisch belastet werden. Gleichzeitig wird die Handhabung großer lithografischer Druckplattenträger mit zunehmender Größe und gleichbleibenden Festigkeitswerten schwieriger.Very high demands are placed on the quality of aluminum strips for the production of lithographic printing plate carriers. The aluminum strip for the production of lithographic printing plate supports is usually subjected to an electrochemical roughening, which should result in a blanket roughening and a structureless appearance without streaking effects. The roughened structure is important for applying a photosensitive layer, which is subsequently exposed. The photo-layer is baked at temperatures of 220 ° C to 300 ° C and annealing times of 3 to 10 minutes, typical combinations of burn-in times being for example 240 ° C at 10 minutes, 260 ° C at 6 minutes and 260 ° C for 4 minutes. The pressure plate carrier must after burning as possible lose little strength, so that it is still easy to handle and can be easily clamped in a printing device. At the same time, the printing plate support and thus also the correspondingly produced aluminum strip must have the highest possible flexural fatigue strength, so that plate outlier can be virtually eliminated due to mechanical stresses on the printing plate. So far, these requirements have been well met with conventional aluminum strips. To increase productivity but increasingly printing presses are used, which require that the printing plate supports are clamped so that they are bent transversely to the rolling direction and therefore mechanically loaded transversely to the rolling direction. At the same time, the handling of large lithographic printing plate supports becomes more difficult with increasing size and consistent strength values.

Beispielsweise ist aus dem auf die Anmelderin zurückgehenden europäischen Patent EP 1 065 071 B1 ein Band zur Herstellung von lithografischen Druckplattenträgern bekannt, welches sich durch eine gute Aufraubarkeit kombiniert mit einer hohen Biegewechselbeständigkeit und einer ausreichenden thermischen Stabilität nach einem Einbrennvorgang auszeichnet. Aufgrund der zunehmenden Größe der Druckmaschinen und der daraus resultierenden Vergrößerung der benötigten Druckplattenträger hat sich jedoch die Notwenigkeit ergeben, die Eigenschaften der bekannten Aluminiumlegierung und der daraus hergestellten lithografischen Druckplattenträger weiter zu verbessern. Eine einfache Erhöhung der Zugfestigkeiten, welche beispielsweise durch eine Änderung der Aluminiumlegierung möglich ist, führte nicht zu dem gewünschten Erfolg, da bei hoher Zugfestigkeit die Korrektur des Coilsets des Aluminiumbandes schwieriger wurde. Diese wird üblicherweise im walzharten Zustand vor dem Einbrennvorgang durchgeführt.For example, from the Applicant's European patent EP 1 065 071 B1 a ribbon for the production of lithographic printing plate supports known, which is characterized by a good aufraubarkeit combined with a high flexural fatigue resistance and a sufficient thermal stability after a burn-in. Due to the increasing size of the printing presses and the resulting increase in the required pressure plate carrier, however, the need has arisen to further improve the properties of the known aluminum alloy and the lithographic printing plate carrier produced therefrom. A simple increase in tensile strength, for example, by a change in the aluminum alloy is possible, did not lead to the desired result, since at high tensile strength, the correction of the coil set of the aluminum strip was difficult. This is usually carried out in the hard-rolling state before the baking process.

Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Aluminiumbandes für lithografische Druckplattenträger sowie ein entsprechendes Aluminiumband zur Verfügung zu stellen, dessen Coilset in walzhartem Zustand leicht korrigierbar ist und aus welchem auch übergroße Druckplattenträger herstellbar sind, die leicht handhabbar und nur eine geringe Neigung zu Plattenreißern zeigen.Proceeding from this, the present invention has the object to provide a method for producing an aluminum strip for lithographic printing plate support and a corresponding aluminum strip available, the coil set is easily correctable in hard-rolling condition and from which also oversized printing plate support can be produced, which is easy to handle and only show a low tendency to plate tears.

Gemäß einer ersten Lehre der vorliegenden Erfindung wird die oben aufgezeigte Aufgabe verfahrensmäßig dadurch gelöst, dass das Aluminiumband aus einer Aluminiumlegierung mit folgenden Legierungsbestandteilen in Gewichtsprozent besteht:

  • 0,3 % ≤ Fe ≤ 0,4 %,
  • 0, 25 % ≤ Mg ≤ 0,6 %,
  • 0,05 % ≤ Si ≤ 0,25 %,
    • Mn ≤ 0,05 %,
    • Cu ≤ 0,04 %,
According to a first teaching of the present invention, the above-described object is procedurally achieved in that the aluminum strip consists of an aluminum alloy with the following alloy constituents in percent by weight:
  • 0.3% ≤ Fe ≤ 0.4%,
  • 0, 25% ≤ Mg ≤ 0.6%,
  • 0.05% ≦ Si ≦ 0.25%,
    • Mn ≤ 0.05%,
    • Cu ≤ 0.04%,

Rest Al sowie unvermeidbare Verunreinigungen, einzeln max. 0,05 %, in Summe max. 0,15 %, während des Kaltwalzens eine Zwischenglühung bei einer Dicke von 1,5 mm bis 0,5 mm durchgeführt wird, das Aluminiumband anschließend durch Kaltwalzen auf eine Enddicke von 0,15 mm bis 0,5 mm gewalzt wird und zur Weiterverarbeitung zu einem lithografischen Druckplattenträger in walzhartem Zustand aufgehaspelt wird.Residual Al and unavoidable impurities, individually max. 0.05%, in total max. 0.15%, during the cold rolling an intermediate annealing is carried out at a thickness of 1.5 mm to 0.5 mm, the aluminum strip is then rolled by cold rolling to a final thickness of 0.15 mm to 0.5 mm and for further processing to one lithographic printing plate support is rolled up in hard-rolled condition.

Das erfindungsgemäß hergestellte Aluminiumband kann stellt eine moderate Festigkeitserhöhung zusammen mit einer sehr hohen Biegewechselbeständigkeit und einer gleichzeitig sehr guten thermischen Stabilität bereit. Coilsetkorrekturen sind aufgrund der moderaten Festigkeitssteigerung ohne Schwierigkeiten möglich. Gleichzeitig ist aber auch das Handling der Druckplatte auch in eingebranntem Zustand, beispielsweise beim Einspannen in die Druckmaschine, einfach, da eine gute thermische Stabilität des Aluminiumbandes mit dem erfindungsgemäßen Verfahren erhalten wird. Wird das Aluminiumband für die Herstellung von sehr großen lithografischen Druckplattenträger eingesetzt, wird vorzugsweise das Aluminiumband auf eine Enddicke von 0,25 bis 0,5 mm nach dem Zwischenglühen kaltgewalzt. Die besondere Eignung der nach dem erfindungsgemäßen Verfahren hergestellten Aluminiumbänder für übergroße lithografische Druckplattenträger ergibt sich daraus, dass einerseits aufgrund der geringen Abwalzgrade nach dem Zwischenglühen eine hohe Dehnung zur Verfügung gestellt wird und andererseits durch den erhöhten Magnesiumanteil höhere Festigkeiten durch Verfestigungen zur Verfügung gestellt werden, die das Handling vereinfachen.The aluminum strip produced according to the invention can provide a moderate increase in strength together with a very high flexural fatigue resistance and at the same time very good thermal stability. Coilset corrections are possible without difficulty due to the moderate increase in strength. At the same time, however, the handling of the printing plate even in a baked state, for example when clamping in the printing press, is simple, since a good thermal stability of the aluminum strip is obtained by the method according to the invention. If the aluminum strip is used for the production of very large lithographic printing plate supports, preferably the aluminum strip is cold rolled to a final thickness of 0.25 to 0.5 mm after the intermediate annealing. The particular suitability of the aluminum strips for oversized lithographic printing plate supports produced by the process according to the invention results from the fact that a high elongation is made available on the one hand due to the low degree of rolling after the intermediate annealing and on the other hand by the increased magnesium content higher strengths are provided by solidifications, the simplify the handling.

Gemäß einer ersten Ausgestaltung der vorliegenden Erfindung können die erfindungsgemäßen Eigenschaften besonders prozesssicher dadurch erreicht werden, dass die Aluminiumlegierung zusätzlich einen Titan(Ti)-Gehalt von max. 0,05 Gew.-%, vorzugsweise max. 0,015 Gew.-%, einen Zink(Zn)-Gehalt von max. 0,05 Gew.-% und einen Chrom(Cr)-Gehalt Gehalt von weniger als 100 ppm, vorzugsweise einen Cr-Gehalt von max. 50 ppm aufweist. Titan wird üblicherweise zur Kornfeinung beim Gießen eingesetzt. Ein erhöhter Ti-Gehalt führt jedoch zu Gießproblemen. Zink beeinflusst die Aufraubarkeit, so dass dessen Gehalt max. 0,05 Gew.-% betragen sollte. Typische Probleme ergeben sich bei erhöhtem Zn-Gehalt aufgrund von Inhomogenitäten beim Aufrauen der lithografischen Druckplattenträger. Chrom ist rekristallisationshemmend und sollte daher nur in ganz geringen Anteilen von weniger als 100 ppm, vorzugsweise von max. 50 ppm in der Aluminiumlegierung enthalten sein.According to a first embodiment of the present invention, the properties according to the invention can be achieved particularly reliably by the fact that the aluminum alloy additionally has a titanium (Ti) content of max. 0.05% by weight, preferably max. 0.015 wt .-%, a zinc (Zn) content of max. 0.05 wt .-% and a chromium (Cr) content Content of less than 100 ppm, preferably a Cr content of max. 50 ppm. Titanium is commonly used for grain refining during casting. However, an increased Ti content leads to casting problems. Zinc affects the Aufraubarkeit, so that its content max. Should be 0.05 wt .-%. Typical problems arise with increased Zn content due to inhomogeneities in the roughening of lithographic printing plate supports. Chromium is recrystallization inhibiting and should therefore only in very small proportions of less than 100 ppm, preferably of max. 50 ppm contained in the aluminum alloy.

Die Aluminiumlegierung gemäß der vorliegenden Erfindung weist einen Mg-Gehalt von 0,25 Gew.-% bis 0,6 Gew.-%, vorzugsweise 0,25 bis 0,4 Gew.-% auf. Hierdurch können maximale Festigkeiten bei hoher Biegewechselbeständigkeit zur Verfügung gestellt werden. Höhere Mg-Gehalten ermöglichen eine weitere Verringerung der Abwalzgrade nach der Zwischenglühung bei gleichzeitigem Erhalt oder Vergrößerung der Zugfestigkeitswerte, insbesondere auch quer zur Walzrichtung.The aluminum alloy according to the present invention has an Mg content of 0.25 wt% to 0.6 wt%, preferably 0.25 to 0.4 wt%. As a result, maximum strengths can be provided with high bending fatigue resistance. Higher Mg contents make it possible to further reduce the degrees of finish after the intermediate annealing, while at the same time maintaining or increasing the tensile strength values, in particular also transversely to the rolling direction.

Durch die Einstellung der Warmwalztemperaturen im Bereich von 250 °C bis 550 °C, wobei die Warmbandendtemperatur 280 °C bis 350 °C beträgt, wird eine durchgehende Rekristallisation der Oberfläche beim Warmwalzen erzielt, was beispielsweise eine gute Aufraubarkeit der Wandoberfläche während der Herstellung der lithografischen Druckplattenträger gewährleistet.By setting the hot rolling temperatures in the range of 250 ° C to 550 ° C, the hot strip end temperature is 280 ° C to 350 ° C, a continuous recrystallization of the surface is achieved during hot rolling, which, for example, a good Aufraubarkeit the wall surface during the production of lithographic Pressure plate carrier guaranteed.

Vorzugsweise beträgt während der Zwischenglühung die Metalltemperatur des Aluminiumbandes 200 °C bis 450 °C. Das Aluminiumband wird dann für mindestens ein bis zwei Stunden auf der Metalltemperatur gehalten. Dies erfolgt üblicherweise in Batchöfen. Durch die Zwischenglühung in dem genannten Temperaturbereich kann die Weiterverarbeitung des Aluminiumbandes entweder in erholtem oder rekristallisiertem Zustand oder einer Kombination aus beidem erfolgen. Die Rekristallisation beginnt etwa ab Temperaturen von 300 bis 350 °C, wobei diese von den Fertigungsparametern, insbesondere den eingebrachten Verfestigungen abhängig ist. Durch ein Erholungsglühen bei niedrigeren Temperaturen kann dagegen lediglich ein Abbau der Verfestigungen erzielt werden, so dass sehr geringe Abwalzgrade nach dem Erholungsglühen möglich sind. Abhängig von den jeweiligen Abwalzgraden nach dem Zwischenglühen und der Legierungszusammensetzung kann es jedoch auch notwendig sein, ein Rekristallisationsglühen als Zwischenglühung vorzunehmen.Preferably, during the intermediate annealing, the metal temperature of the aluminum strip is 200 ° C to 450 ° C. The aluminum band will then be for at least one to two Hours kept at the metal temperature. This is usually done in batch ovens. Due to the intermediate annealing in the temperature range mentioned, the further processing of the aluminum strip can take place either in a recovered or recrystallized state or a combination of both. The recrystallization starts at temperatures of about 300 to 350 ° C, which depends on the manufacturing parameters, in particular the introduced solidifications. On the other hand, a regeneration annealing at lower temperatures merely results in a reduction of the solidifications, so that very low degrees of reduction after recovery annealing are possible. However, depending on the respective degrees of rolling after the intermediate annealing and the alloy composition, it may also be necessary to perform recrystallization annealing as an intermediate annealing.

Gemäß einer zweiten Lehre der vorliegenden Erfindung wird die oben aufgezeigte Aufgabe durch ein gattungsgemäßes Aluminiumband zur Herstellung von lithografischen Druckplattenträgern gelöst, welches aus einer Aluminiumlegierung mit folgenden Legierungsbestandteilen in Gew.-% besteht:

  • 0,3 % ≤ Fe ≤ 0,4 %,
  • 0,25 % ≤ Mg ≤ 0,6 %,
  • 0,05 % ≤ Si ≤ 0,25 %,
    • Mn ≤ 0,05 %,
    • Cu ≤ 0,04 %,
According to a second teaching of the present invention, the object indicated above is achieved by a generic aluminum strip for the production of lithographic printing plate supports, which consists of an aluminum alloy with the following alloy constituents in% by weight:
  • 0.3% ≤ Fe ≤ 0.4%,
  • 0.25% ≤ Mg ≤ 0.6%,
  • 0.05% ≦ Si ≦ 0.25%,
    • Mn ≤ 0.05%,
    • Cu ≤ 0.04%,

Rest Al sowie unvermeidbare Verunreinigungen, einzeln max. 0,05 %, in Summe max. 0,15 %; das Aluminiumband eine Zugfestigkeit von bis zu 200 MPa in walzhartem Zustand längs zur Walzrichtung und nach einem Einbrennvorgang mit einer Temperatur von 240 °C und einer Dauer von 10 Minuten von mindestens 145 MPa sowie eine Biegewechselbeständigkeit quer zur Walzrichtung von mindestens 1850 Zyklen im Biegewechseltest aufweist.Residual Al and unavoidable impurities, individually max. 0.05%, in total max. 0.15%; the aluminum strip has a tensile strength of up to 200 MPa in hard-rolled condition along the rolling direction and after baking at a temperature of 240 ° C and a duration of 10 minutes of at least 145 MPa, as well as a bending resistance transverse to the rolling direction of at least 1850 cycles in the bending cycle test.

Im Biegewechseltest wird ein Streifen aus dem Aluminiumband herausgeschnitten und zwischen zwei zylinderförmigen Segmenten mit einem Radius von 30 mm hin- und hergebogen. Im Gegensatz zu den bisher hergestellten Aluminiumbändern für lithografische Druckplattenträger erreichen die erfindungsgemäßen Aluminiumbänder nach einem Einbrennvorgang Biegewechselzyklen von mehr als 1850 auch quer zur Walzrichtung, was einen Anstieg gegenüber den bisher verwendeten Standartlegierungen von über 70 % bedeutet. Aufgrund der moderaten Steigerung der Zugfestigkeit auf Werte bis zu 200 MPa in walzhartem Zustand längs zur Walzrichtung gemessen, kann der Coilset des erfindungsgemäßen Aluminiumbandes weiterhin auf einfache Weise korrigiert werden. Aufgrund der guten thermischen Stabilität, welche sich durch eine Zugfestigkeit von mindestens 145 MPa nach einem Einbrennvorgang längs oder quer zur Walzrichtung zeigt, ist das Handling der aus dem Aluminiumband hergestellten lithografischen Druckplattenträger auch nach einem Einbrennvorgang gut. Selbst bei sehr großen lithografischen Druckplattenträgern kann durch die erhöhte Festigkeiten nach dem Einbrennen das Handling der Druckplatten erleichtert werden. Zudem zeigt die hohe Anzahl von möglichen Biegewechselzyklen größer als 1850 sowohl im walzharten als auch im eingebrannten Zustand des erfindungsgemäßen Aluminiumbandes, dass die Neigung zu Plattenreißern aufgrund von mechanischen Belastungen bei quer oder längs zur Walzrichtung eingespannten lithografischen Druckplattenträger gering ausgeprägt ist.In the Biegewechselnest a strip is cut out of the aluminum strip and bent back and forth between two cylindrical segments with a radius of 30 mm. In contrast to the aluminum strips produced so far for lithographic printing plate supports, the aluminum strips according to the invention achieve bending cycle cycles of more than 1850, also transverse to the rolling direction, which means an increase of more than 70% compared with the standard alloys used hitherto. Due to the moderate increase in tensile strength measured to values up to 200 MPa in hard-rolling condition along the rolling direction, the coil set of the aluminum strip according to the invention can be further corrected in a simple manner. Due to the good thermal stability, which manifests itself by a tensile strength of at least 145 MPa after a baking process along or transverse to the rolling direction, the handling of the lithographic printing plate carrier produced from the aluminum strip is also good after a baking process. Even with very large lithographic printing plate supports can be facilitated by the increased strength after baking, the handling of the printing plates. In addition, the high number of possible bending cycle cycles greater than 1850 both in the hard as well as in the baked state of the aluminum strip according to the invention, that the tendency to As a result of mechanical stresses, plate cracks are small in the case of lithographic printing plate supports clamped transversely or longitudinally to the rolling direction.

Ein Aluminiumband mit einem Mg-Gehalt von 0,25 Gew.-% bis 0,6 Gew.-%, vorzugsweise 0,3 Gew.-% bis 0,4 Gew.-% ermöglicht zudem bei ausreichend hohen Zugfestigkeitswerten besonders hohe Dehnungswerte im walzharten Zustand, da bereits bei geringen Abwalzgraden nach dem Zwischenglühen die notwendigen Festigkeitswerte erreicht werden.An aluminum strip having an Mg content of from 0.25% by weight to 0.6% by weight, preferably from 0.3% by weight to 0.4% by weight, also permits particularly high elongation values in the case of sufficiently high tensile strength values Hard-rolling condition, since the required strength values are achieved even at low rolling degrees after intermediate annealing.

Gemäß einer weiteren Ausgestaltung des erfindungsgemäßen Aluminiumbandes werden die Eigenschaften des fertig hergestellten Aluminiumbandes dadurch prozesssicher erreicht, dass die Aluminiumlegierung einen Ti-Gehalt von max. 0,05 Gew.-%, vorzugsweise max. 0,015 Gew.-%, einen Zn-Gehalt von max. 0,05 Gew.-% und einen Cr-Gehalt von weniger als 100 ppm, vorzugsweise von max. 10 ppm aufweist.According to a further embodiment of the aluminum strip according to the invention, the properties of the finished aluminum strip are thereby achieved process reliable, that the aluminum alloy has a Ti content of max. 0.05% by weight, preferably max. 0.015 wt .-%, a Zn content of max. 0.05 wt .-% and a Cr content of less than 100 ppm, preferably of max. 10 ppm.

Aus Aluminiumbändern mit einer Dicke von 0,25 bis 0,5 mm können gemäß einer letzten Ausgestaltung des erfindungsgemäßen Aluminiumbandes besonderes gut übergroße Druckplattenträger hergestellt und auf einfache weise prozessiert und gehandhabt werden.From aluminum strips with a thickness of 0.25 to 0.5 mm, according to a last embodiment of the aluminum strip according to the invention, it is possible to produce particularly well-oversized printing plate supports and to process and handle them in a simple manner.

Gemäß einer dritten Lehre der vorliegenden Erfindung wird die oben aufgezeigte Aufgabe durch Druckplattenträger gelöst, welche aus einem erfindungsgemäßen Aluminiumband hergestellt sind. Hinsichtlich der Vorteile der erfindungsgemäßen Druckplattenträger wird auf die obigen Ausführungen zum verfahren zur Herstellung eines Aluminiumbandes sowie zum erfindungsgemäßen Aluminiumband verwiesen.According to a third teaching of the present invention, the object indicated above is achieved by pressure plate carriers which are produced from an aluminum strip according to the invention. With regard to the advantages of the pressure plate carrier according to the invention is based on the above statements on the method for producing a Referenced aluminum strip and the aluminum strip according to the invention.

Es gibt nun eine Vielzahl von Möglichkeiten das erfindungagemäße Verfahren zur Herstellung von Aluminiumbänder für lithografische Druckplattenträger, das Aluminiumband für lithografische Druckplattenträger sowie den Druckplattenträger selbst weiterzuentwickeln und auszugestalten. Hierzu wird verwiesen einerseits auf die den Patentansprüchen 1 und 6 nachgeordneten Patentansprüche sowie auf die Beschreibung von Ausführungsbeispielen in Verbindung mit der Zeichnung.There are now a variety of ways the erfindungagemäße process for the production of aluminum strips for lithographic printing plate support to further develop and design the aluminum strip for lithographic printing plate support and the printing plate support itself. Reference is made on the one hand to the claims subordinate to claims 1 and 6 claims and to the description of embodiments in conjunction with the drawings.

In der Zeichnung zeigt die einzige Figur eine schematische Darstellung des Biegewechseltests zur Prüfung der Biegewechselbeständigkeit.In the drawing, the single figure shows a schematic representation of the bending cycle test for testing the bending fatigue resistance.

Ein Vergleich zwischen einem konventionellen Aluminiumband zur Herstellung von lithografischen Druckplattenträgern sowie zwei erfindungsgemäßen Aluminiumbändern und einem Vergleichsaluminiumband, welche ebenfalls für die Herstellung von lithografischen Druckplattenträgern geeignet sind, wird im folgenden dargestellt. Die Legierungsbestandteile der unterschiedlichen, getesteten Aluminiumbänder sind in Tabelle 1 dargelegt. Tab.1 Leg.-Nr. Fe Mn Mg Si Cu /Gew. -% Vref 0,32 - 0,17 0,12 7 ppm Stand der Technik V582 0,36 0,0034 0,3 0,09 3 ppm Erfindung V581 0,36 0,018 0,2 0,08 5 ppm Vergleich V580 0,4 0,10 0,11 0,08 < 10 ppm Vergleich A comparison between a conventional aluminum strip for the production of lithographic printing plate supports and two aluminum strips according to the invention and a comparison aluminum strip, which are likewise suitable for the production of lithographic printing plate supports, is shown below. The Alloy components of the different aluminum tapes tested are set forth in Table 1. Table 1 Leg.-Nr. Fe Mn mg Si Cu / Wt. -% Vref 0.32 - 0.17 0.12 7 ppm State of the art V582 0.36 0.0034 0.3 0.09 3 ppm invention V581 0.36 0,018 0.2 0.08 5 ppm comparison V580 0.4 0.10 0.11 0.08 <10 ppm comparison

Die Tabelle 1 zeigt nur die wesentlichen Legierungsbestandteile der untersuchten Aluminiumbänder darüber hinaus wiesen die verschiedenen Versuchslegierungen einen Ti-Gehalt von weniger als 0,015 Gew.-%, einen Zn-Gehalt von weniger als 0,05 Gew.-% sowie einen Cr-Gehalt von weniger als 100 ppm auf. Die aus den verschiedenen Aluminiumlegierungen gegossenen Walzbarren sind vor dem Walzen einer Homogenisierung unterzogen worden, wobei die Walzbarren auf eine Temperatur von etwa 580 °C für mehr als vier Stunden geglüht wurden. Anschließend erfolgte das Warmwalzen bei Temperaturen von 250 °C bis 550 °C, wobei die Warmbandendtemperatur zwischen 280 °C und 350 °C betrug. Das Aluminiumwarmband aus der Legierung VRef wurde während des Kaltwalzens bei einer Dicke von 2 bis 2,4 mm einer Zwischenglühung unterzogen, wobei das kaltgewalzte Band einer Temperatur von 300 bis 450 °C für ein bis zwei Stunden ausgesetzt war. Bei gleichen Zwischenglühungstemperaturen betrug die Zwischenglühungsdicke für die anderen Aluminiumbänder nur 0,9 bis 1,2 mm, wie auch aus der Tabelle 2 ersichtlich ist. Da die zwischengeglühten Bänder auf Enddicke weiter kaltgewalzt wurden, ohne dass eine abschließende Endglühung erfolgte, wurden diese im Zustand walzhart aufgehaspelt. Tab. 2 Leg.-Nr. warmbandenddicke Zwischenglühungsdicke Enddicke Zustand Vref 3 - 4 mm 2 - 2,4 mm 0,29 mm Walzhart V582 3 - 4 mm 0,9 - 1, 2 mm 0,28 mm Walzhart V581 3 - 4 mm 0,9 - 1,2 mm 0,28 mm Walzhart V580 3 - 4 mm 0,9 - 1,2 mm 0,28 mm Walzhart Table 1 shows only the essential alloying constituents of the aluminum tapes tested, moreover, the various experimental alloys had a Ti content of less than 0.015 wt%, a Zn content of less than 0.05 wt%, and a Cr content of less than 100 ppm. The ingots cast from the various aluminum alloys have been subjected to homogenization prior to rolling, the ingots being annealed to a temperature of about 580 ° C for more than four hours. Subsequently, the hot rolling was carried out at temperatures of 250 ° C to 550 ° C, the hot strip temperature was between 280 ° C and 350 ° C. The VRef alloy aluminum hot strip was subjected to intermediate annealing during cold rolling at a thickness of 2 to 2.4 mm, with the cold rolled strip being exposed to a temperature of 300 to 450 ° C for one to two hours. At the same intermediate annealing temperatures, the intermediate annealing thickness for the other aluminum strips was only 0.9 to 1.2 mm, as can be seen from Table 2 is. Since the intermediate annealed strips were further cold rolled to final thickness, without a final final annealing, they were coiled up hard as a condition. Tab. 2 Leg.-Nr. hot strip Zwischenglühungsdicke final thickness Status Vref 3 - 4 mm 2 - 2.4 mm 0.29 mm As rolled V582 3 - 4 mm 0.9 - 1, 2 mm 0.28 mm As rolled V581 3 - 4 mm 0.9 - 1.2 mm 0.28 mm As rolled V580 3 - 4 mm 0.9 - 1.2 mm 0.28 mm As rolled

Die entsprechend hergestellten Aluminiumbänder für lithografische Druckplattenträger bzw. Lithobänder, wurden weiteren Tests unterzogen. Alle vier Aluminiumbänder zeichnen sich durch ein sehr gutes Aufrauverhalten aus. Darüber hinaus wurde die Zugfestigkeit im walzharten Zustand untersucht. Um die praktische Handhabung der Druckplatten, insbesondere bei übergroßen lithografischen Druckplatten zu prüfen wurden Zugfestigkeiten auch nach einem Einbrennvorgang von 240 °C für 10 Minuten gemessen. Zusätzlich wurden Biegewechseltest durchgeführt, bei welchem die in Fig. 1 schematisch dargestellte Versuchsanordnung verwendet wurde.The correspondingly produced aluminum strips for lithographic printing plate supports or litho tapes were subjected to further tests. All four aluminum bands are characterized by a very good roughening behavior. In addition, the tensile strength in the hard-rolled state was investigated. In order to test the practical handling of the printing plates, especially for oversized lithographic printing plates, tensile strengths were measured even after a baking process of 240 ° C for 10 minutes. In addition, a bending change test was carried out in which the in Fig. 1 schematically illustrated experimental design was used.

Fig. 1a) zeigt in einer schematischen Schnittansicht den Aufbau der verwendeten Biegewechseltestvorrichtung 1, welche zur Untersuchung der Biegewechselbeständigkeit der erfindungsgemäßen Aluminiumbänder eingesetzt wurde. Proben 2 aus den hergestellten Aluminiumbändern für lithografische Druckplattenträger werden in der Segment 3 sowie einem feststehenden Segment 4 befestigt. Das Segment wird beim Biegewechseltest auf dem feststehenden Segment 4 durch eine Abrollbewegung hin- und herbewegt, so dass die Probe 2 Biegungen senkrecht zur Erstreckung der Probe 2 ausgesetzt ist. Die verschiedenen Biegezustände zeigt schematisch Fig. 1b). Die Proben 2 wurden entweder längs oder quer zur Walzrichtung aus den hergestellten Aluminiumbändern für lithografische Druckplattenträger ausgeschnitten. Der Radius der Segmente 3,4 betrug 30 mm. Fig. 1a ) shows in a schematic sectional view of the structure of the bending change test device 1 used, which was used to investigate the flexural fatigue resistance of the aluminum strips according to the invention. Samples 2 from the produced aluminum strips for lithographic printing plate supports are described in US Pat Segment 3 and a fixed segment 4 attached. The segment is reciprocated on the fixed segment 4 by a rolling motion in the bending change test, so that the sample 2 is subjected to bends perpendicular to the extension of the sample 2. The different bending states shows schematically Fig. 1b ). Samples 2 were cut either longitudinally or transversely to the rolling direction from the prepared aluminum platens for lithographic printing plate supports. The radius of the segments 3,4 was 30 mm.

Die Zugfestigkeiten wurden nach DIN gemessen. Die Ergebnisse der Zugfestigkeitsmessungen im walzharten Zustand bzw. nach einem Einbrennvorgang sowie die Biegewechseltestergebnisse sind in Tabelle 3a und 3b dargestellt. Tab. 3a Leg.-Nr. Zugfestigkeit
(MPa) walzhart
Zugfestigkeit
(MPA) 240°/10 min.
längs quer längs quer
Vref 198 201 154 154 V582 184 201 153 161 V581 177 192 145 155 V580 218 228 157 169
Tab. 3b Leg. -Nr. Biegewechseltest nach 260°/4 min. Anzahlzyklen Biegewechseltest walzhart Anzahlzyklen längs quer längs quer Vref 3400 1500 3030 1930 V582 4570 2670 4070 2320 V581 4230 2150 4100 2000 V580 3190 2090 2840 2200
The tensile strengths were measured according to DIN. The results of the tensile strength measurements in the hard-rolled state or after a baking process as well as the bending cycle test results are shown in Tables 3a and 3b. Tab. 3a Leg.-Nr. tensile strenght
Hard (MPa)
tensile strenght
(MPA) 240 ° / 10 min.
along crosswise along crosswise
Vref 198 201 154 154 V582 184 201 153 161 V581 177 192 145 155 V580 218 228 157 169
Leg. -No. Bending change test after 260 ° / 4 min. Number of cycles Bending change test, hard-hard Number of cycles along crosswise along crosswise Vref 3400 1500 3030 1930 V582 4570 2670 4070 2320 V581 4230 2150 4100 2000 V580 3190 2090 2840 2200

Es zeigte sich, dass das konventionelle Aluminiumband zwar eine für die Korrektur des Coilsets vor dem Einbrennvorgang und für das Handling des lithografischen Druckplattenträgers nach dem Einbrennvorgang ausreichende Zugfestigkeit sowie eine ausreichende Biegewechselbeständigkeit längs zur Walzrichtung aufweisen. Quer zur Walzrichtung erreichte das konventionell hergestellte Aluminiumband (VRef) jedoch lediglich 1500 Biegezyklen. Das erfindungsgemäße Aluminiumband V582 zeigt dagegen sehr gute Zugfestigkeiten in Bezug auf Coilsetkorrektur und Handling der Druckplatte nach einem Einbrennvorgang sowie eine sehr hohe Biegewechselbeständigkeit. Es wurden eine bis zu 78 % höhere Anzahl an Biegezyklen erreicht, Legierung V582. Im Vergleich dazu zeigte das Vergleichsaluminiumband V580 zwar ebenfalls gute Werte bezüglich der Biegewechselbeständigkeit. Die sehr hohen Zugfestigkeiten von 218 bzw. 228 MPa längs respektive quer zur Walzrichtung erschweren die Korrektur des Coilsets jedoch vor dem Einbrennen der Fotoschicht der lithografischen Druckplattenträger.It was found that the conventional aluminum strip has a tensile strength which is sufficient for the correction of the coil set prior to the stoving process and for the handling of the lithographic printing plate support after the stoving process as well as a sufficient resistance to flexing along the rolling direction. However, the conventionally manufactured aluminum strip (VRef) only reached 1500 bending cycles transverse to the rolling direction. On the other hand, the aluminum strip V582 according to the invention shows very good tensile strengths with regard to coil set correction and handling of the printing plate after a burn-in process as well as a very high bending fatigue resistance. Up to 78% higher number of bending cycles were achieved, alloy V582. In comparison, the comparative aluminum tape V580 also showed good values with respect to flexural fatigue resistance. However, the very high tensile strengths of 218 and 228 MPa, respectively longitudinal and transverse to the rolling direction, complicates the correction of the coil set prior to baking the photo layer of the lithographic printing plate supports.

Im walzharten Zustand, welcher für negativ Druckplatten verwendet wird, zeigten sich insbesondere in längs zur Walzrichtung eine deutliche Verbesserung Biegewechselbeständigkeit. Quer zur Walzrichtung ehöhten sich die Werte ebenfalls.In the hard-rolled state, which is used for negative printing plates, a significant improvement in flexural fatigue resistance was found especially in the longitudinal direction of the rolling direction. Transverse to the rolling direction, the values also increased.

Es hat sich gezeigt, dass durch Auswahl einer speziell auf die Bedürfnisse großer lithografischer Druckplattenträger abgestimmter Aluminiumlegierung in Kombination mit ausgewählten Verfahrensparametern die Herstellung von deutlich verbesserten lithografischen Druckplattenträgern ermöglicht, welche auch bei der Verwendung von Übergrößen, d.h. wenn diese quer zur Walzrichtung eingespannt werden, auf einfache Weise gehandhabt werden können und dennoch resistent gegen Plattenreißer sind.It has been found that by selecting an aluminum alloy specifically tailored to the needs of large lithographic printing plate supports, in combination with selected process parameters, it is possible to produce significantly improved lithographic printing plate supports, which is also useful when using oversize, i. if they are clamped transversely to the rolling direction, can be handled easily and are still resistant to Plattenreißer.

Claims (10)

  1. A method for producing aluminium strips for lithographic printing plate carriers, wherein the aluminium strip is produced from a rolling ingot, which after optional homogenization is hot-rolled to a thickness of 2 mm to 7 mm and the aluminium strip is cold-rolled to a final thickness of 0.15 mm to 0.5 mm by cold rolling the hot strip,
    characterized in that
    the aluminium strip is made from an aluminium alloy with the following alloy components according to percentage by weight:
    0.3% < Fe ≤ 0.4%,
    0.25% ≤ Mg ≤ 0.6%,
    0.05% ≤ Si ≤ 0.25%,
    Mn ≤ 0.05%,
    Cu ≤ 0.04%,
    with the remainder being Al and unavoidable impurities, individually not exceeding 0.05%, in total not exceeding 0.15%; an intermediate annealing stage is carried out at a thickness from 1.5 mm to 0.5 mm during cold rolling, and the aluminium strip is then cold-rolled to a final thickness from 0.15 mm to 0.5 mm, and is coiled in the full hard state for further processing to yield a lithographic printing plate carrier.
  2. The method according to claim 1,
    characterized in that
    the aluminium alloy has a maximum Ti content of 0.05% by weight, a maximum Zn content of 0.05% by weight, and a Cr content of less than 100 ppm.
  3. The method according to claim 1 or 2,
    characterized in that
    the aluminium alloy has a Mg content of 0.3% to 0.4% by weight.
  4. The method according to any of claims 1 to 3,
    characterized in that
    hot rolling is carried out at a temperature from 250 °C to 550 °C, wherein the final temperature of the hot strip is 280 °C to 350 °C.
  5. The method according to any of claims 1 to 4,
    characterized in that
    during the intermediate annealing stage the metal temperature is between 200 °C and 450 °C, and the aluminium strip is maintained at said metal temperature for at least one to two hours.
  6. An aluminium strip for producing lithographic printing plate carriers, having a thickness of 0.15 mm to 0.5 mm and produced by a method according to any of claims 1 to 5,
    characterized in that
    the aluminium strip is made from an aluminium alloy with the following alloy components according to percentage by weight:
    0.3% ≤ Fe ≤ 0.4%,
    0.25% ≤ Mg ≤ 0.6%,
    0.05% ≤ Si ≤ 0.25%,
    Mn ≤ 0.05%,
    Cu ≤ 0.04%,
    with the remainder being Al and unavoidable impurities individually not exceeding 0.05%, in total not exceeding 0.15%, the aluminium strip in the full hard state has a tensile strength of up to 200 MPa longitudinally with the rolling direction and at least 145 MPa following a baking process at a temperature of 240 °C for a duration of 10 minutes, and a reverse bending strength transversely to the rolling direction of at least 1850 cycles in the reverse bending test.
  7. The aluminium strip according to claim 6,
    characterized in that
    the aluminium alloy has a Mg content of 0.3% to 0.4% by weight.
  8. The aluminium strip according to claim 6 or 7,
    characterized in that
    the aluminium alloy has a maximum Ti content of 0.05% by weight, a maximum Zn content of 0.05% by weight, and a Cr content of less than 50 ppm.
  9. The aluminium strip according to any of claims 6 to 8,
    characterized in that
    it has a thickness from 0.25 to 0.5 mm.
  10. A printing plate carrier manufactured from an aluminium strip according to any of claims 6 to 9.
EP07023245.9A 2007-11-30 2007-11-30 Aluminium strip for lithographic pressure plate carriers and its manufacture Active EP2067871B2 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
SI200731221T SI2067871T2 (en) 2007-11-30 2007-11-30 Aluminium strip for lithographic pressure plate carriers and its manufacture
ES07023245T ES2407655T5 (en) 2007-11-30 2007-11-30 Aluminum strip for supports for lithographic printing plates and their production
EP07023245.9A EP2067871B2 (en) 2007-11-30 2007-11-30 Aluminium strip for lithographic pressure plate carriers and its manufacture
CN2008801185883A CN101883876A (en) 2007-11-30 2008-11-24 Aluminium strip for lithographic pressure plate carriers and its manufacture
BRPI0819596A BRPI0819596B8 (en) 2007-11-30 2008-11-24 METHOD FOR THE PRODUCTION OF ALUMINUM STRIPS FOR LITHOGRAPHIC PLATE SUPPORTS
PCT/EP2008/066086 WO2009068502A1 (en) 2007-11-30 2008-11-24 Aluminum strip for lithographic printing plate carriers and the production thereof
DE202008018332U DE202008018332U1 (en) 2007-11-30 2008-11-24 Aluminum strip for lithographic printing plate supports and its production
JP2010535350A JP5319693B2 (en) 2007-11-30 2008-11-24 Aluminum strip for lithographic printing plate support and its manufacture
EP08853549.7A EP2220262B1 (en) 2007-11-30 2008-11-24 Aluminium strip for lithographic pressure plate carriers and its manufacture
ES08853549.7T ES2456269T3 (en) 2007-11-30 2008-11-24 Aluminum band for supports for lithographic printing plates and their production
US15/494,285 US11326232B2 (en) 2007-11-30 2017-04-21 Aluminum strip for lithographic printing plate carriers and the production thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07023245.9A EP2067871B2 (en) 2007-11-30 2007-11-30 Aluminium strip for lithographic pressure plate carriers and its manufacture

Publications (3)

Publication Number Publication Date
EP2067871A1 EP2067871A1 (en) 2009-06-10
EP2067871B1 true EP2067871B1 (en) 2013-02-20
EP2067871B2 EP2067871B2 (en) 2022-10-19

Family

ID=39400918

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07023245.9A Active EP2067871B2 (en) 2007-11-30 2007-11-30 Aluminium strip for lithographic pressure plate carriers and its manufacture
EP08853549.7A Revoked EP2220262B1 (en) 2007-11-30 2008-11-24 Aluminium strip for lithographic pressure plate carriers and its manufacture

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP08853549.7A Revoked EP2220262B1 (en) 2007-11-30 2008-11-24 Aluminium strip for lithographic pressure plate carriers and its manufacture

Country Status (9)

Country Link
US (1) US11326232B2 (en)
EP (2) EP2067871B2 (en)
JP (1) JP5319693B2 (en)
CN (1) CN101883876A (en)
BR (1) BRPI0819596B8 (en)
DE (1) DE202008018332U1 (en)
ES (2) ES2407655T5 (en)
SI (1) SI2067871T2 (en)
WO (1) WO2009068502A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0617702B8 (en) 2005-10-19 2023-01-10 Hydro Aluminium Deutschland Gmbh PROCESS FOR THE PRODUCTION OF AN ALUMINUM RIBBON FOR LITHOGRAPHIC PRINTING PLATE SUPPORTS
SI2067871T2 (en) 2007-11-30 2023-01-31 Speira Gmbh Aluminium strip for lithographic pressure plate carriers and its manufacture
EP2192202B2 (en) 2008-11-21 2022-01-12 Speira GmbH Aluminium sheet for lithographic printing plate support having high resistance to bending cycles
WO2012059362A1 (en) 2010-11-04 2012-05-10 Novelis Inc. Aluminium lithographic sheet
EP2495106B1 (en) * 2011-03-02 2015-05-13 Hydro Aluminium Rolled Products GmbH Aluminium band for lithographic printing plate carriers with water-based coatings
JP2013177685A (en) * 2013-04-11 2013-09-09 Kobe Steel Ltd High strength aluminum alloy sheet for automatic plate-making printing plate
CN103667819B (en) * 2013-11-22 2015-09-16 中铝瑞闽股份有限公司 CTP version base and preparation method thereof
EP3445887B1 (en) 2016-04-20 2019-09-11 Hydro Aluminium Rolled Products GmbH Lithographic sheet manufacturing with high cold roll pass reduction
CN107868887A (en) * 2016-09-23 2018-04-03 镇江龙源铝业有限公司 A kind of LED lamp aluminium strip new material
JP7378615B2 (en) * 2019-11-12 2023-11-13 スペイラ ゲゼルシャフト ミット ベシュレンクテル ハフツング Adjusted foil heat treatment
EP4015658A1 (en) * 2020-12-18 2022-06-22 Speira GmbH Aluminium foil with improved barrier property

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Also Published As

Publication number Publication date
DE202008018332U1 (en) 2013-02-07
ES2407655T3 (en) 2013-06-13
JP2011505493A (en) 2011-02-24
SI2067871T1 (en) 2013-06-28
EP2067871A1 (en) 2009-06-10
US20170253952A1 (en) 2017-09-07
JP5319693B2 (en) 2013-10-16
EP2220262A1 (en) 2010-08-25
EP2220262B1 (en) 2014-01-08
CN101883876A (en) 2010-11-10
SI2067871T2 (en) 2023-01-31
US11326232B2 (en) 2022-05-10
ES2456269T3 (en) 2014-04-21
BRPI0819596B1 (en) 2021-03-02
WO2009068502A1 (en) 2009-06-04
BRPI0819596B8 (en) 2023-01-10
ES2407655T5 (en) 2023-02-23
BRPI0819596A2 (en) 2020-08-25
EP2067871B2 (en) 2022-10-19

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