EP1820866B2 - Aluminiumcarbidfreie Aluminiumlegierung - Google Patents

Aluminiumcarbidfreie Aluminiumlegierung Download PDF

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Publication number
EP1820866B2
EP1820866B2 EP06002809.9A EP06002809A EP1820866B2 EP 1820866 B2 EP1820866 B2 EP 1820866B2 EP 06002809 A EP06002809 A EP 06002809A EP 1820866 B2 EP1820866 B2 EP 1820866B2
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EP
European Patent Office
Prior art keywords
aluminium
aluminum
strip
aluminium alloy
stirring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06002809.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1820866B1 (de
EP1820866A1 (de
Inventor
Werner Droste
Bernhard Dr. Kernig
Henk-Jan Dr. Brinkman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Speira GmbH
Original Assignee
Hydro Aluminium Rolled Products GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Hydro Aluminium Rolled Products GmbH filed Critical Hydro Aluminium Rolled Products GmbH
Priority to ES06002809.9T priority Critical patent/ES2524005T5/es
Priority to EP06002809.9A priority patent/EP1820866B2/de
Priority to BRPI0707735A priority patent/BRPI0707735B8/pt
Priority to PCT/EP2007/051404 priority patent/WO2007093605A1/de
Priority to CN200780010378.8A priority patent/CN101405415B/zh
Priority to US12/279,107 priority patent/US20090220376A1/en
Publication of EP1820866A1 publication Critical patent/EP1820866A1/de
Priority to US13/423,602 priority patent/US8869875B2/en
Publication of EP1820866B1 publication Critical patent/EP1820866B1/de
Publication of EP1820866B2 publication Critical patent/EP1820866B2/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • 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 an aluminum alloy for producing an aluminum strip for lithographic printing plate support, a method for producing an aluminum alloy according to the invention for lithographic printing plate support, wherein in the production of aluminum alloy after the electrolysis of the aluminum oxide, the liquid aluminum is supplied to a plurality of purification steps and an aluminum strip for lithographic Printing plate support and a corresponding use of the aluminum strip for lithographic printing plate support.
  • Print plate supports for lithographic printing from an aluminum alloy must meet very high requirements for their suitability for today's printing technology.
  • the pressure plate carrier produced from an aluminum strip must be able to be roughened homogeneously, whereby mechanical, chemical and electrochemical roughening methods and their combination are used.
  • the printing plates are often after baking and developing a baking process between 220 to 300 ° C with an annealing time of 3 to 10 min. subjected to cure the applied photoresist.
  • various aluminum alloys have been developed to meet the requirement profile.
  • the US patent US 4,003,738 discloses a method for removing carbide from an aluminum melt by fuming with the melt with chlorine gas. The production of an aluminum alloy for lithographic printing plate supports is not disclosed.
  • the Japanese patent application JP 2004292862 discloses pure aluminum, an Al-Mn, Al-Mn-Mg or Al-Mg alloy having a very low aluminum carbide content.
  • a method for producing a aluminum alloy with a low aluminum carbide content is also known from US 2004/0173053 A1 known.
  • JP 2000-309829 A a method of removing impurities, especially aluminum carbide, from an aluminum melt.
  • an inert gas is supplied to the molten aluminum in a stirring station for a period of 30 minutes.
  • a method for producing an aluminum alloy for lithographic printing plate support is not apparent from this document.
  • the object of the present invention is to provide an aluminum alloy for producing an aluminum strip for lithographic printing plate supports and a corresponding aluminum strip for lithographic printing plate supports, from which or with which lithographic printing plate supports can be produced that require the use of almost gas-tight coatings enable.
  • the invention has the object, a method for producing a corresponding aluminum alloy and an advantageous use of the To propose aluminum strip for lithographic printing plate supports.
  • the above-described object is achieved in that the aluminum alloy has an aluminum carbide content of less than 1 ppm and the following alloy constituents in% by weight: 0.05 % ⁇ mg ⁇ 0.3 % . Mn ⁇ 0.3%, 0.4 % ⁇ Fe ⁇ 1 % . 0.05 % ⁇ Si ⁇ 0.5%, Cu ⁇ 0.04 % . Ti ⁇ 0.04%, unavoidable impurities individually max. 0.01%, in total max. 0.05% and balance Al.
  • printing plate support which have been made of an aluminum alloy with a correspondingly low Aluminiumcarbidrent allow the use of gas-tight coatings, since the blistering is extremely low. It is believed that the slightest trace of aluminum carbide (Al 4 C 3 ) and its reaction with moisture to form methane gas causes bubbling under the gas tight coatings. Surprisingly, it has been found that in particular the composition of the aluminum alloy of the printing plate support plays an important role in the blistering, although it was previously assumed that it is essentially one of the Surface of the printing plate carrier is tried phenomenon. Previous aluminum alloys have therefore not been optimized for the lowest possible aluminum carbide content.
  • the aluminum carbide content of the aluminum alloy according to the invention is adjusted to less than 1 ppm, so that blistering is prevented in the case of gas-tight coating of the printing plate carrier.
  • the further composition of the aluminum alloy corresponds to an aluminum alloy of the type AA1xxx, AA3xxx, AA8xxx, preferably AA1050, or AA3103.
  • the aluminum alloys mentioned it is known that they at least partially meet the requirements for lithographic printing plate supports and have hitherto been used for their production.
  • the aluminum alloy according to the invention comprises the following alloy constituents in% by weight: 0.05 % ⁇ mg ⁇ 0.3 % . Mn ⁇ 0.3 % . 0.4 % ⁇ Fe ⁇ 1 % . 0.05 % ⁇ Si ⁇ 0.5%, Cu ⁇ 0.04 % . Ti ⁇ 0.04%, unavoidable impurities individually max. 0.01%, in total max. 0.05% and balance Al.
  • the aluminum alloy according to the invention has an aluminum carbide content of less than 1 ppm and alternatively the following alloy constituents in% by weight: 0.1 % ⁇ mg ⁇ 0.3 % . Mn ⁇ 0.05%, 0.3 % ⁇ Fe ⁇ 0.4 % . 0.05 % ⁇ Si ⁇ 0.25%, Cu ⁇ 0.04 % . Ti ⁇ 0.04 % . unavoidable impurities individually max. 0.01%, in total max. 0.05% and balance Al
  • This aluminum alloy is particularly well suited for the production of lithographic printing plate supports due to its balanced properties in terms of mechanical stability, chemical and electrochemical Aufraushi. Again, this aluminum alloy is significantly improved by the reduction of the aluminum carbide content according to the invention in relation to the production of printing plate supports provided with a virtually gas-tight coating.
  • the above object is procedurally achieved in that after the electrolysis of the alumina, the liquid aluminum is fed to a stirring station in which inert gases are introduced with stirring in the liquid aluminum, the duration of stirring and blowing of the inert gas into the molten aluminum in the stirring station for at least 15 min. is and the proportion of aluminum carbides in the aluminum alloy to less than 1 ppm, is lowered.
  • the purification steps of aluminum alloys have been aimed at reducing other impurities such as alkaline earth or alkali metals, of course, aluminum carbides were removed from the molten aluminum. For this reason, the aluminum carbide contents of the conventionally produced aluminum alloys were clearly above the values according to the invention.
  • the liquid aluminum is fed to a stirring station in which inert gases are introduced with stirring into the liquid aluminum, wherein the duration of stirring and blowing the inert gas into the molten aluminum in the stirring at least 15 min. is.
  • inert gases are introduced with stirring into the liquid aluminum, wherein the duration of stirring and blowing the inert gas into the molten aluminum in the stirring at least 15 min. is.
  • a reduction of the aluminum carbide content of the molten aluminum results from the fact that the liquid aluminum supplied to the stirring station has been obtained at least partially from cold metal.
  • Cold metal is already produced from an electrolysis of alumina aluminum, which has undergone some process steps after the electrolysis, for example, a stirring station.
  • the aluminum carbide content of the supplied cold metal is therefore typically much lower than that of a liquid aluminum originating from the electrolysis. It is believed that the burnup of the graphite electrodes used in the electrolysis contribute to the aluminum carbide content of the aluminum melt produced from alumina.
  • the aluminum carbide content of the aluminum alloy according to the invention is additionally reduced further by adding aluminum fluorides to the stirring station during the stirring of the liquid aluminum. These remove the alkali metals sodium, calcium and lithium, but also via oxidation, in particular elements such as titanium and phosphorus. At the same time, however, it was found that the aluminum carbide content of the aluminum melt is also reduced.
  • the aluminum is further refined according to one Embodiment of the method according to the invention, supplied to the furnace for adding the alloy constituents, wherein the aluminum in the furnace for at least more than 30 min., Preferably at least more than 60 min. after alloying has taken place in the oven by stirring and adding the alloying ingredients.
  • This ensures that the aluminum carbide compounds contained mostly in gas bubbles of the previously introduced into the molten aluminum gas together with these can migrate to the surface of the molten aluminum and form part of the dross to be removed from the melt there.
  • the aluminum alloy may be subjected to at least one segregation step in which the aluminum alloy is heated to slightly above the solidus temperature of the aluminum alloy so that molten heavily contaminated phases can be extruded from the aluminum alloy.
  • These highly contaminated phases of the aluminum alloy additionally contain aluminum carbide compounds, which can be removed in this way from the aluminum melt.
  • the inventive method for producing an aluminum alloy for lithographic printing plate supports with respect to reducing the aluminum carbide content can be further improved by filtering the aluminum alloy prior to strand or ribbon casting, the filter having a high filter efficiency for smaller or smaller sized particles equal to 5 ⁇ m. It goes without saying that the filter efficiency of these filters is also high, even for larger particles with a size of significantly more than 5 ⁇ m . It has been found that the aluminum carbides are typically present predominantly in impurity particles larger than 10 ⁇ m , so that filtering the aluminum alloy provides additional reduction of the aluminum carbide content. Since the filtering of the aluminum alloy takes place immediately before the casting of the aluminum alloy, this step, especially in combination with the previously described measures, a high control value attached.
  • two-stage filter used consisting of a first ceramic foam filter with a downstream Tiefbettfilter.
  • the addition of grain refining material can take place between the two filters in order to ensure the highest possible effectiveness of the ceramic foam filter through the construction of a filter cake and a long service life of the downstream deep bed filter.
  • the above-described object is achieved for an aluminum strip for lithographic printing plate support that this is prepared by continuous or discontinuous casting of an aluminum alloy according to the invention with subsequent hot and / or cold forming, wherein the aluminum alloy according to the invention using the inventive Process has been prepared.
  • the aluminum strip according to the invention then consists of an extremely low-aluminum-carbide material, so that it is ideally suited for the production of printing plate supports with a gas-tight coating.
  • An aluminum strip with only a few aluminum carbide compounds on its surface and in the core material can be provided by removing the rolling oil residues on the aluminum strip for lithographic printing plate supports by annealing and degreasing the strip.
  • the aluminum ribbon is made using an acidic or basic medium of a first Degreasing, and then further cleaning using a pickling process so that the removal of aluminum carbide on the surface is even more thorough.
  • an aluminum strip with a further reduced amount of aluminum carbide compounds can be provided on its surface.
  • the aluminum alloy of the aluminum strip according to the invention itself has very low proportions of aluminum carbide compounds, so that in combination with the almost aluminum carbide-free surface of the aluminum strip, an aluminum strip, ideal for coating with gas-tight coatings, is available for lithographic printing plate supports.
  • the above-described object with respect to the use of the aluminum strip is achieved by using the aluminum strip according to the invention for the production of lithographic printing plate supports with a gas-tight coating.
  • the production of an aluminum alloy according to the invention begins by an electrolysis 1 of aluminum oxide.
  • the liquid aluminum is then fed to a stirring station 2, alternatively or cumulatively to the aluminum obtained directly from aluminum oxide, as shown in the figure, cold metal 3 can be supplied to the stirring station.
  • the cold metal contains less aluminum carbide than an aluminum melt produced directly from aluminum oxide, since the latter additionally contains carbon compounds and thus aluminum carbide by burning off the graphite electrodes.
  • the minimum gassing and stirring time should be between 10 and 20 min. lie.
  • the aluminum melt is fed to a furnace 4.
  • a gas flushing with reactive and / or inert gases are carried out in the furnace 4 and the alloying constituents added.
  • the gas flushing leads to a further reduction of the aluminum carbide content in the aluminum melt.
  • the aluminum alloy is in the oven for a certain period of time, so that the gas bubbles previously dissolved in the melt have enough time to get to the surface of the molten aluminum.
  • the standing of the melt in the oven can for a period of 15 to 90 min., Preferably from 30 to 60 min. be made.
  • the gas bubbles which have reached the surface of the molten aluminum during gas purging with reactive and / or inert gases are skimmed off from the melt by scraping off the aluminum alloy and thus removed from the aluminum alloy.
  • the dross then contains the aluminum carbides flushed out of the aluminum melt.
  • the liquid aluminum alloy is fed to a rotor degassing 5, which operates, for example, by the SNIF process (Spinning Nozzle Inert Flotation), for example purged with argon and / or chlorine.
  • the fine gas bubbles sweep the contaminants to the bath surface, with chlorine being particularly liable to cause the sodium and calcium contaminants to harden to salts, which are then deposited with the gas bubbles in a scratch layer on the aluminum alloy. The scratching layer is then removed again.
  • the aluminum alloy according to the invention is preferably filtered before casting Filter 6 subjected, which has a high filter efficiency for particles with a size of less than or equal to 5 ⁇ m.
  • filters 6 having a filter efficiency of at least 50% can be used for these particles. Since aluminum carbides generally to larger particles, mostly adhered with a size of about 10 ⁇ m, can be further reduced aluminum carbide content of the aluminum alloy effectively by the filtering step. Subsequently, the aluminum alloy can be fed to a continuous or discontinuous casting process 7, 8.
  • the aluminum alloy may be subjected to at least one segregation step in a segregation station, not shown, in which the aluminum alloy is heated to a temperature just above the solidus temperature of the aluminum alloy. Heavily contaminated phases of the aluminum melt melt below the solidus temperature so that they can be pressed out of the molten aluminum and removed. Since the contaminated phases usually also contain aluminum carbides, their proportion in the aluminum alloy according to the invention is further reduced by the optional segregation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP06002809.9A 2006-02-13 2006-02-13 Aluminiumcarbidfreie Aluminiumlegierung Active EP1820866B2 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES06002809.9T ES2524005T5 (es) 2006-02-13 2006-02-13 Aleación de aluminio libre de carburo de aluminio
EP06002809.9A EP1820866B2 (de) 2006-02-13 2006-02-13 Aluminiumcarbidfreie Aluminiumlegierung
CN200780010378.8A CN101405415B (zh) 2006-02-13 2007-02-13 无碳化铝的铝合金
PCT/EP2007/051404 WO2007093605A1 (de) 2006-02-13 2007-02-13 Aluminiumcarbidfreie aluminiumlegierung
BRPI0707735A BRPI0707735B8 (pt) 2006-02-13 2007-02-13 Ligas de alumínio para a fabricação de uma tira de alumínio para portadores de placas de impressão litográfica, processo para a fabricação de uma tira de alumínio, tira de alumínio e uso da tira de alumínio.
US12/279,107 US20090220376A1 (en) 2006-02-13 2007-02-13 Aluminum alloy free from aluminum carbide
US13/423,602 US8869875B2 (en) 2006-02-13 2012-03-19 Aluminum alloy free from aluminum carbide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06002809.9A EP1820866B2 (de) 2006-02-13 2006-02-13 Aluminiumcarbidfreie Aluminiumlegierung

Publications (3)

Publication Number Publication Date
EP1820866A1 EP1820866A1 (de) 2007-08-22
EP1820866B1 EP1820866B1 (de) 2014-08-20
EP1820866B2 true EP1820866B2 (de) 2018-08-08

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ID=36711690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06002809.9A Active EP1820866B2 (de) 2006-02-13 2006-02-13 Aluminiumcarbidfreie Aluminiumlegierung

Country Status (6)

Country Link
US (2) US20090220376A1 (zh)
EP (1) EP1820866B2 (zh)
CN (1) CN101405415B (zh)
BR (1) BRPI0707735B8 (zh)
ES (1) ES2524005T5 (zh)
WO (1) WO2007093605A1 (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101321882B (zh) 2005-10-19 2011-09-21 海德鲁铝业德国有限责任公司 用于石版印刷板支持体的铝带
US9068246B2 (en) * 2008-12-15 2015-06-30 Alcon Inc. Decarbonization process for carbothermically produced aluminum
ES2501595T3 (es) 2009-05-08 2014-10-02 Novelis, Inc. Plancha litográfica de aluminio
JP5750219B2 (ja) * 2009-08-13 2015-07-15 富士フイルム株式会社 平版印刷版用アルミニウム板材
JP2012072487A (ja) * 2010-09-03 2012-04-12 Fujifilm Corp 平版印刷版用アルミニウム合金板及びその製造方法
WO2012059362A1 (en) 2010-11-04 2012-05-10 Novelis Inc. Aluminium lithographic sheet
DE102014209102A1 (de) 2014-05-14 2015-11-19 Federal-Mogul Nürnberg GmbH Verfahren zur Herstellung eines Motorbauteils, Motorbauteil und Verwendung einer Aluminiumlegierung
US20200071825A1 (en) * 2018-08-28 2020-03-05 Applied Materials, Inc. Methods Of Depositing Metal Carbide Films

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP1937860B1 (de) † 2005-10-19 2013-08-14 Hydro Aluminium Deutschland GmbH Aluminiumband für lithographische druckplattenträger

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Also Published As

Publication number Publication date
US8869875B2 (en) 2014-10-28
US20120195788A1 (en) 2012-08-02
CN101405415A (zh) 2009-04-08
CN101405415B (zh) 2011-01-12
EP1820866B1 (de) 2014-08-20
ES2524005T5 (es) 2018-12-10
BRPI0707735B8 (pt) 2023-01-10
ES2524005T3 (es) 2014-12-03
US20090220376A1 (en) 2009-09-03
EP1820866A1 (de) 2007-08-22
BRPI0707735A2 (pt) 2011-05-10
WO2007093605A1 (de) 2007-08-23
BRPI0707735B1 (pt) 2017-03-28

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