EP0666329A1 - Bande d'aluminium pour plaques d'impression offset - Google Patents

Bande d'aluminium pour plaques d'impression offset Download PDF

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Publication number
EP0666329A1
EP0666329A1 EP94101881A EP94101881A EP0666329A1 EP 0666329 A1 EP0666329 A1 EP 0666329A1 EP 94101881 A EP94101881 A EP 94101881A EP 94101881 A EP94101881 A EP 94101881A EP 0666329 A1 EP0666329 A1 EP 0666329A1
Authority
EP
European Patent Office
Prior art keywords
printing plates
tib2
offset printing
strip
aluminium strip
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.)
Withdrawn
Application number
EP94101881A
Other languages
German (de)
English (en)
Inventor
Wolfgang Dr. Schneider
Barbara Dr. Grzemba
Hans Peter Dr. Krug
Wolfgang Dietz
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.)
Vereinigte Aluminium Werke AG
Vaw Aluminium AG
Original Assignee
Vereinigte Aluminium Werke AG
Vaw Aluminium AG
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
Application filed by Vereinigte Aluminium Werke AG, Vaw Aluminium AG filed Critical Vereinigte Aluminium Werke AG
Priority to EP94101881A priority Critical patent/EP0666329A1/fr
Publication of EP0666329A1 publication Critical patent/EP0666329A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys

Definitions

  • the invention relates to an aluminum strip for offset printing plates.
  • Pure aluminum (AA 1050) is predominantly used as the material for offset printing plates. Alloys of the type AlMn (AA 3003 or 3104) or AlMg (AA 5005) are also used.
  • the aluminum strips are usually roughened in the further processing to presensitized printing plates after alkaline degreasing and / or pretreatment. Currently, this roughening takes place predominantly electrochemically in an aqueous solution based on hydrochloric acid or nitric acid under alternating current, sometimes with mechanical roughening upstream.
  • This roughening also called grain, aims on the one hand to improve the adhesion of the subsequent coating with a light-sensitive layer, which will later determine the maximum achievable print run, and on the other hand to completely wet the non-image areas with a small amount of water.
  • the grain should be as fine and uniform as possible. Local imperfections, which are weaker or unevenly roughened, lead to the water film being torn off and thus to printing in the non-image areas.
  • the aluminum strip In order that the electrochemical roughening takes place uniformly and does not have a strip-shaped topography oriented in the rolling direction, the aluminum strip must have a grain that is as fine as possible and not too elongated.
  • the grain stretching is controlled via the rolling process (EP-B-0 193 710). Requirement for a uniform and fine grain in the strip is a fine crystalline, globulitic structure of the casting material. For this reason, the pure aluminum melt is grain-refined with an AlTiB pre-alloy before casting.
  • the quality of the grain refinement is of particular importance for pure aluminum for use as an offset tape.
  • a sufficient amount of grain refinement has to be used in order to avoid elongated crystals, so-called "feather crystals".
  • this amount must not be too large because the TiB2 originating from the master alloy tends to agglomerate together with other undesirable impurities, such as oxides. Both phenomena, feathery crystals and TiB2 lines, lead to an uneven or locally disturbed roughening in the end product.
  • the invention is based on the object of providing an aluminum strip with a structure which has no local inhomogeneities and can therefore be roughened uniformly as a prerequisite for the good adhesion of a light-sensitive layer applied to the aluminum strip when used for offset printing plates.
  • a tape made of pure aluminum is proposed according to the invention, in which foreign particles each have a length of less than 5 ⁇ m and the structure does not have more than 25 TiB2 agglomerates in a line length of maximum 20 ⁇ m in a 150 mm2 grinding surface.
  • the micrograph in Fig. 1 shows in part a) in 1000x magnification the TiB2 distribution of a conventional aluminum strip with many foreign particles agglomerated into elongated lines.
  • the micrograph of an aluminum strip according to the invention is shown in part b). You can see a comparison of the two Micrographs clearly show the smaller expansion of the TiB2 agglomerates. The few foreign particles in the structure are agglomerated into a short row and in this form do not interfere with the subsequent electrochemical roughening.
  • FIG. 2 For comparison, the micrograph of a commercially available grain refining wire is shown in FIG. 2, part a).
  • This master alloy is added in an amount of 0.5 to 0.8 kg / t in the casting channel of the aluminum melt.
  • the melt which has been cleaned very well by furnace treatment, is subjected to additional cleaning to remove any remaining or formed TiB2 oxide agglomerates behind the grain refinement addition by effective in-line treatment (filtration), e.g. by combining a ceramic filter and SNIF box .
  • filtration effective in-line treatment
  • the maximum specific filter performance of a ceramic filter is 10 kg / cm2 at 35 t / h throughput.
  • the statistical check of the filtration efficiency is carried out by the PoDFA method.
  • the melt is cast into ingots in hot-top molds in a continuous casting.
  • the casting temperature, measured in the channel, should be below 700 ° C in order to achieve the desired grain refinement effect.
  • the casting speed must not be chosen too high, in order not to weaken the favorable influence of grain refinement for suppressing the feathery crystals. It should be less than 5 mm / min.
  • the cast bars are heated to about 600 ° C and kept at this temperature for at least 4 h. It is then cooled to the hot rolling temperature at about 50 K / h. The subsequent hot rolling takes place at an initial temperature of approximately 500 ° C to a final temperature of approximately 320 ° C.
  • the hot strip end thickness is in the range of 2.5 to 4.5 mm.
  • the hot-rolled strip is then cold-rolled to a final thickness of 0.5 to 0.1 mm. Intermediate annealing in the range of 400 to 450 ° C with a holding time of at least 2 h may occur.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP94101881A 1994-02-08 1994-02-08 Bande d'aluminium pour plaques d'impression offset Withdrawn EP0666329A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94101881A EP0666329A1 (fr) 1994-02-08 1994-02-08 Bande d'aluminium pour plaques d'impression offset

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94101881A EP0666329A1 (fr) 1994-02-08 1994-02-08 Bande d'aluminium pour plaques d'impression offset

Publications (1)

Publication Number Publication Date
EP0666329A1 true EP0666329A1 (fr) 1995-08-09

Family

ID=8215669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94101881A Withdrawn EP0666329A1 (fr) 1994-02-08 1994-02-08 Bande d'aluminium pour plaques d'impression offset

Country Status (1)

Country Link
EP (1) EP0666329A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1752308A1 (fr) * 2005-07-14 2007-02-14 Fuji Photo Film Co., Ltd. Support pour plaque lithographique, son procédé de fabrication, ainsi qu'une plaque présensibilisée
CN1895908B (zh) * 2005-07-14 2010-05-12 富士胶片株式会社 平版印刷版用支持体、其制造方法、和平版印刷版原版

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589946A (ja) * 1981-05-01 1983-01-20 Kobe Steel Ltd Ａｌ及びＡｌ合金溶湯の清浄化処理方法
JPS6126746A (ja) * 1984-07-18 1986-02-06 Kobe Steel Ltd 平版印刷版用アルミニウム合金
JPS61262446A (ja) * 1985-05-13 1986-11-20 Kobe Steel Ltd ＡｌまたはＡｌ合金の結晶粒微細化方法
US4790873A (en) * 1983-08-16 1988-12-13 Alcan International Limited Removing inclusions from molten metal
US4869750A (en) * 1987-04-28 1989-09-26 Alcan International Limited Liquid metal launder
GB2216542A (en) * 1988-03-07 1989-10-11 Kb Alloys Inc Third element additions to aluminum-titanium master alloys

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589946A (ja) * 1981-05-01 1983-01-20 Kobe Steel Ltd Ａｌ及びＡｌ合金溶湯の清浄化処理方法
US4790873A (en) * 1983-08-16 1988-12-13 Alcan International Limited Removing inclusions from molten metal
JPS6126746A (ja) * 1984-07-18 1986-02-06 Kobe Steel Ltd 平版印刷版用アルミニウム合金
JPS61262446A (ja) * 1985-05-13 1986-11-20 Kobe Steel Ltd ＡｌまたはＡｌ合金の結晶粒微細化方法
US4869750A (en) * 1987-04-28 1989-09-26 Alcan International Limited Liquid metal launder
GB2216542A (en) * 1988-03-07 1989-10-11 Kb Alloys Inc Third element additions to aluminum-titanium master alloys

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
A.ABDEL-HAMID ET AL: "NATURE ET MORPHOLOGIE DES CRISTAUX RICHES EN TI ET EN B DANS LES ALLIAGES AL-TI-B RICHES EN AL", JOURNAL OF CRYSTAL GROWTH, vol. 66, 1984, AMSTERDAM NL, pages 195 - 204, XP024421131, DOI: doi:10.1016/0022-0248(84)90091-5 *
ALUMINIUM (DUESSELDORF) (1991), 67(5), 463-8, 473 CODEN: ALUMAB;ISSN: 0002-6689, 1991 *
CHEMICAL ABSTRACTS, vol. 115, no. 14, 7 October 1991, Columbus, Ohio, US; abstract no. 140407, HOLZE, JOACHIM ET AL: "Grain refinement of cast aluminum strip with aluminum-titanium-boron master alloy wire" *
CHR. J. SIMENSEN: "THE EFFECT OF MELT REFINING UPON INCLUSIONS IN ALUMINUM", METALLURGICAL TRANSACTIONS B. PROCESS METALLURGY, vol. 13, no. 1, March 1982 (1982-03-01), NEW YORK US, pages 31 - 34 *
DATABASE WPI 1986 Derwent World Patents Index; AN 078312 *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 123 (M - 581) 17 April 1987 (1987-04-17) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 77 (C - 159) 30 March 1983 (1983-03-30) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1752308A1 (fr) * 2005-07-14 2007-02-14 Fuji Photo Film Co., Ltd. Support pour plaque lithographique, son procédé de fabrication, ainsi qu'une plaque présensibilisée
CN1895908B (zh) * 2005-07-14 2010-05-12 富士胶片株式会社 平版印刷版用支持体、其制造方法、和平版印刷版原版
CN101596817B (zh) * 2005-07-14 2011-03-09 富士胶片株式会社 平版印刷版用支持体的制造方法
US8338073B2 (en) 2005-07-14 2012-12-25 Fujifilm Corporation Lithographic printing plate support, method of manufacturing the same, and presensitized plate

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