EP0093961A1 - Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression - Google Patents

Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression Download PDF

Info

Publication number
EP0093961A1
EP0093961A1 EP83104146A EP83104146A EP0093961A1 EP 0093961 A1 EP0093961 A1 EP 0093961A1 EP 83104146 A EP83104146 A EP 83104146A EP 83104146 A EP83104146 A EP 83104146A EP 0093961 A1 EP0093961 A1 EP 0093961A1
Authority
EP
European Patent Office
Prior art keywords
alternating current
aluminum
aqueous
printing plate
electrolyte
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.)
Granted
Application number
EP83104146A
Other languages
German (de)
English (en)
Other versions
EP0093961B1 (fr
Inventor
Engelbert Dr. Dipl.-Chem. Pliefke
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.)
Hoechst AG
Original Assignee
Hoechst 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 Hoechst AG filed Critical Hoechst AG
Publication of EP0093961A1 publication Critical patent/EP0093961A1/fr
Application granted granted Critical
Publication of EP0093961B1 publication Critical patent/EP0093961B1/fr
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/04—Etching of light metals
    • 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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/09—Wave forms

Definitions

  • the invention relates to a method for the electrochemical roughening of aluminum for printing plate supports, which is carried out with alternating current in one of the customary acid and / or salt electrolytes.
  • Printing plates generally consist of a support and at least one radiation-sensitive reproduction layer arranged thereon, this layer either from the consumer (in the case of non-precoated plates) or from the industrial one Manufacturer (for pre-coated boards) is applied to the substrate.
  • Aluminum or one of its alloys has established itself as a layer material in the printing plate field.
  • these substrates can also be used without a modifying pretreatment, but they are generally modified in or on the surface, for example by mechanical, chemical and / or electrochemical roughening (sometimes also called grain or etching in the literature), chemical or electrochemical oxidation and / or treatment with hydrophilizing agents.
  • a combination of the above-mentioned types of MDdification is often used tion of electrochemical roughening and anodic oxidation, optionally with a subsequent hydrophilization step.
  • the roughening is carried out, for example, in aqueous acids such as aqueous HCl or HN0 3 solutions or in aqueous salt solutions such as aqueous NaCl or Al (NO 3 ) 3 solutions using alternating current.
  • the roughness depths that can be achieved in this way are in the range from about 1 to 15 ⁇ m, in particular in the range from 2 to 8 ⁇ m.
  • the roughness depth is determined in accordance with DIN 4768 in the version from October 1970, the roughness depth R z is then the arithmetic mean of the individual roughness depths of five adjacent individual measuring sections.
  • the roughening is carried out, inter alia, in order to improve the adhesion of the reproduction layer on the substrate and the water flow of the printing plate resulting from the printing plate by irradiation (exposure) and development.
  • irradiation and development or decoating in the case of reproduction layers working electrophotographically
  • the image points which carry color during later printing and the water-bearing non-image points are produced on the printing plate, whereby the actual printing form is created.
  • Various parameters have an influence on the later topography of the aluminum surface to be roughened, which may be exemplified by the following explanations:
  • the essay "The Alternating Current Etching of Aluminum Lithography Sheet" by AJ Dowell in Transactions of the Institute of Metal Finishing, 1979, Vol. 57, pp. 138 to 144 contains basic explanations made to roughen aluminum in aqueous hydrochloric acid solutions, the following process parameters varied and the corresponding effects were examined.
  • the electrolyte composition is changed with repeated use of the electrolyte, for example with regard to the H + (H 3 O + ) ion concentration (measurable via the pH value) and the A1 3 + ion concentration, effects on the surface topography being observed.
  • the temperature variation between 16 ° C and 90 ° C shows a changing influence only from about 50 ° C, which is expressed, for example, by the sharp decline in the formation of layers on the surface.
  • the roughening time change between 2 and 25 min also leads to an increasing metal dissolution with increasing exposure time.
  • the variation of the current density between 2 and 8 A / dm 2 results in higher roughness values with increasing current density. If the acid concentration is in the range 0.17 to 3.3% of HC1, then between 0.5 and 2% of HC1 there are only insignificant changes in the hole structure, below 0.5% of HC1 there is only a local attack on the Surface and at the high values an irregular dissolution of Al instead.
  • the addition of SO 4 2- ions or Cl - ions in salt form [e.g. B. by adding A1 2 (SO 4 ) 3 or NaCl] can also influence the topography of the roughened Aluminum.
  • the rectification of the alternating current shows that both types of half-wave are obviously required for a uniform roughening.
  • the influence of frequency changes or of superimpositions of currents of different frequencies has not been investigated; the frequency was always 50 Hz.
  • aqueous solutions with several components in the roughening of aluminum can lead to more or less uniformly roughened surfaces, but the monitoring of the bath composition, particularly in the currently preferred continuously operating high-speed belt systems, is very complex, but necessary in practice, because the composition of the electrolyte changes frequently during the process.
  • the invention is based on the known method for the electrochemical roughening of aluminum or its alloys for printing plate supports in an aqueous electrolyte under the action of alternating current.
  • the method according to the invention is then characterized in that an alternating current is used which is generated by superimposing at least two types of alternating current of different frequencies.
  • the AC type with the lowest frequency is referred to as the carrier current and the AC type (s) with the higher frequency (s) is referred to as the superimposed current.
  • the frequency of the superimposing alternating current type (s) is a factor of 3 to 100 greater than the frequency of the carrier alternating current, and the ratio of the amplitudes of superimposing alternating current to carrier alternating current is between 0.1 and 10, in particular between 0.2 and 2.
  • Only two types of alternating current are expediently superimposed on one another in the method according to the invention.
  • the shape of the alternating current - with a graphical representation of the course of the current density or voltage as a function of time - can, for example, have a rectangular, trapezoidal or sinusoidal shape; in the method according to the invention, a combination of rectangular shape for the carrier alternating current and sinusoidal shape for the superimposing alternating current is preferred .
  • the process according to the invention is carried out either discontinuously or preferably continuously with strips made of aluminum or its alloys.
  • the process parameters in continuous processes during roughening are in the following ranges: the temperature of the electrolyte between 20 and 60 ° C, the electrolyte (acid and / or salt) concentration between 1 and 250 g, in particular between 5 and 100 g / l, the current density between 3 and 130 A / dm 2 , the residence time of a material point to be roughened in the electrolyte between 10 and 300 sec and the electrolyte flow rate on the surface of the material to be roughened between 5 and 100 cm / sec.
  • Direct current is preferably used for anodic oxidation, however alternating current or a combination of these types of current (e.g. direct current with superimposed alternating current) can also be used will.
  • the layer weights of aluminum oxide range from 1 to 10 g / m, corresponding to a layer thickness of approximately 0.3 to 3.0 ⁇ m.
  • a modification can also be applied which causes surface abrasion from the roughened surface, as described, for example, in DE-OS 30 09 103.
  • a modifying intermediate treatment can, among other things, enable the build-up of abrasion-resistant oxide layers and a lower tendency to tone during later printing.
  • the stage of anodic oxidation of the aluminum printing plate support material can also be followed by one or more post-treatment stages.
  • These post-treatment stages serve, in particular, to further increase the hydrophilicity of the aluminum oxide layer, which is already sufficient for many fields of application, the remaining known properties of this layer being at least retained.
  • all layers are suitable as light-sensitive reproduction layers which, after exposure, optionally with subsequent development and / or fixation, provide an image-like area from which printing can take place and / or which represent a relief image of an original. They are applied either by the manufacturer of presensitized printing plates or by so-called dry resists, or directly by the consumer to one of the carrier materials roughened according to the invention.
  • the reproduction layers include those such as z. B.
  • Suitable layers also include the electrophotographic layers, ie those which contain an inorganic or organic photoconductor. In addition to the light-sensitive substances, these layers can of course also other components such.
  • Resins, dyes, pigments, wetting agents, sensitizers, adhesion promoters, indicators, plasticizers or other conventional auxiliaries can be used in the coating of the carrier materials:
  • Positive-working o-quinonediazide preferably o-naphthoquinonediazide compounds, which are described, for example, in DE-PS 854 890, 865 109, 879 203, 894 959, 938 233, 1 109 521, 1 144 705, 1 118 606, 1 120 273 and 1 124 817.
  • Negative-working condensation products from aromatic diazonium salts and compounds with active carbonyl groups preferably condensation products from diphenylamine diazonium salts and formaldehyde, which are described, for example, in DE-PS 596 731, 1 138 399, 1 138 400, 1 138 401, 1 142 871, 1 154 123 U.S. Patents 2,679,498 and 3,050,502 and British Patent 712,606.
  • Negative mixed condensation products of aromatic diazonium compounds for example according to DE-OS 20 24 244, which each have at least one unit of the general types A (-D) n and B connected by a double-bonded intermediate member derived from a condensable carbonyl compound.
  • A is the remainder of a compound containing at least two aromatic carbocyclic and / or heterocyclic nuclei, which is capable of condensing with an active carbonyl compound in an acidic medium at at least one position.
  • D is a diazonium salt group attached to an aromatic carbon atom of A; n is an integer from 1 to 10; and B is the remainder of a compound free of diazonium groups and capable of condensing with an active carbonyl compound in an acidic medium at at least one position on the molecule.
  • Positive-working layers according to DE-OS 26 10 842 which contain a compound which splits off acid when irradiated, a compound which has at least one C-O-C group which can be split off by acid (e.g. an orthocarboxylic acid ester group or a carboxylic acid amide acetal group) and, if appropriate, a binder.
  • acid e.g. an orthocarboxylic acid ester group or a carboxylic acid amide acetal group
  • the monomers used here are, for example, acrylic and methacrylic acid esters or reaction products of diisocyanates with partial esters of polyhydric alcohols, as described, for example, in US Pat. Nos. 2,760,863 and 3,060,023 and DE-OSes 20 64 079 and 23 61 041.
  • photoinitiators are u. a. Benzoin, benzoin ethers, multinuclear quinones, acridine derivatives, phenazine derivatives, quinoxaline derivatives, quinazoline derivatives or synergistic mixtures of different ketones.
  • soluble organic polymers can be used as binders, e.g. B. polyamides, polyesters, alkyd resins, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, gelatin or cellulose ether.
  • Negative working layers according to DE-OS 30 36 077 which contain a diazonium salt polycondensation product or an organic azido compound as a photosensitive compound and a high molecular weight polymer with pendant alkenylsulfonyl or cycloalkenylsulfonylurethane groups as a binder.
  • photoconductive layers such as z. B. in DE-PS 11 17 391, 15 22 497, 15 72 312, 23 22 046 and 23 22 047 described, are applied to the support materials, whereby highly light-sensitive, electrophotographic layers are formed.
  • the materials for printing plate supports roughened by the process according to the invention have a uniform topography, which has a positive influence on the support stability and the water flow during printing of printing forms made from these supports.
  • "scars" marked depressions compared to the roughening of the surroundings
  • These surface properties can be realized without particularly great expenditure on equipment and without continuous qualitative and quantitative bath monitoring.
  • the uniformity of the roughening may be due to the fact that the gas bubbles formed on the aluminum surface during the electrochemical reaction can be detached from the surface more easily in the process according to the invention.
  • Example 7 a rectangular current is always used as the carrier alternating current and a sine current as the superimposing alternating current; in example 7, a sinusoidal current is also used as the carrier alternating current.
  • An aluminum sheet is first pickled for 60 seconds in an aqueous solution of 20 g NaOH per liter at room temperature and then freed from any alkali residues which may be present by briefly immersing it in a solution corresponding to the roughening electrolyte.
  • the roughening takes place either under galvanostatic or potentiostatic control in the specified electrolytes, with the latter either the reference electrode saturating the Ag / AgCl system (Ex. 32, V8, 34 and 35) or the counterpart. electrode (Ex. 33).
  • Examples 1 to 31 and VI to V7 are galvanostatically (Table I) and Examples 32 to 35 and V8 (Table II) controlled potentiostatically.
  • the electrolysis is started at room temperature of the electrolyte.
  • An aluminum plate roughened according to example 2 is oxidized anodically in an electrolyte made of H 2 SO 4 and Al 2 (SO 4 ) 3 according to the specifications of DE-OS 28 11 396 up to an oxide layer thickness of 2.8 pm.
  • the roughened and anodized aluminum support is provided with the following negative working light-sensitive layer:
  • a print run of 125,000 can be printed from this printing form.
  • a printing plate which has been anodically oxidized and coated in accordance with Example 36, but which is roughened in accordance with Comparative Example V2, results in a printing form after development, of which only 75,000 sheets can be printed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP83104146A 1982-05-10 1983-04-28 Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression Expired EP0093961B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3217499 1982-05-10
DE3217499A DE3217499A1 (de) 1982-05-10 1982-05-10 Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger

Publications (2)

Publication Number Publication Date
EP0093961A1 true EP0093961A1 (fr) 1983-11-16
EP0093961B1 EP0093961B1 (fr) 1987-06-10

Family

ID=6163182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104146A Expired EP0093961B1 (fr) 1982-05-10 1983-04-28 Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression

Country Status (7)

Country Link
US (1) US4468295A (fr)
EP (1) EP0093961B1 (fr)
JP (1) JPS58207374A (fr)
AU (1) AU550815B2 (fr)
BR (1) BR8302397A (fr)
CA (1) CA1209522A (fr)
DE (2) DE3217499A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171835A3 (en) * 1984-07-16 1986-10-08 North American Philips Corporation A process of etching aluminium anode foil for high voltage electrolytic capacitors
EP0661390A1 (fr) * 1993-12-28 1995-07-05 Nihon Chikudenki Kogyo Kabushiki Kaisha Procédé de décapage d'une feuille d'aluminium pour condensateur électrolytique

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6068997A (ja) * 1983-09-27 1985-04-19 Fuji Photo Film Co Ltd 平版印刷版用アルミニウム支持体の製造方法
US4545875A (en) * 1984-08-06 1985-10-08 Polychrome Corporation Electrolytic graining
US4548683A (en) * 1984-09-28 1985-10-22 Polychrome Corp. Method of electrolytically graining a lithographic plate
DE3533532A1 (de) * 1985-09-20 1987-04-02 Hoechst Ag Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger
JPS6282089A (ja) * 1985-10-04 1987-04-15 Fuji Photo Film Co Ltd 平版印刷版用支持体の製造方法
DE3714059C3 (de) * 1987-04-28 1995-12-07 Vaw Ver Aluminium Werke Ag Material in Band- oder Plattenform und Verfahren zu seiner Herstellung sowie dessen Verwendung als Träger für Flachdruckformen
GB9112211D0 (en) * 1991-06-06 1991-07-24 Alcan Int Ltd Treating a1 sheet
JP3117322B2 (ja) * 1993-04-05 2000-12-11 富士写真フイルム株式会社 感光性平版印刷版およびその支持体の製造方法
GB9326150D0 (en) * 1993-12-22 1994-02-23 Alcan Int Ltd Electrochemical roughening method
DE69512321T2 (de) 1994-06-16 2000-05-11 Kodak Polychrome Graphics Llc, Norwalk Lithographische Druckplatten mit einer oleophilen bilderzeugenden Schicht
US20030032879A1 (en) * 1997-07-07 2003-02-13 Steven Quay Microbubble formation using ultrasound
US20030047464A1 (en) * 2001-07-27 2003-03-13 Applied Materials, Inc. Electrochemically roughened aluminum semiconductor processing apparatus surfaces
JP4654083B2 (ja) * 2005-07-20 2011-03-16 富士フイルム株式会社 金属粒子型反応触媒およびその製造方法、並びに該触媒を用いた有機合成反応装置
US20080253922A1 (en) * 2007-04-13 2008-10-16 General Electric Company Method for roughening metal surfaces and article manufactured thereby

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1496956A1 (de) * 1965-03-15 1969-11-27 Paehr Dr Hans Werner Verfahren zur AEtzung von Metallbaendern

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB879768A (en) * 1958-11-19 1961-10-11 Algraphy Ltd Improvements in or relating to the production of lithographic plates
US3193485A (en) * 1960-09-20 1965-07-06 Plessey Co Ltd Electrolytic treatment of aluminium for increasing the effective surface
NL293884A (fr) * 1962-06-15
GB1439127A (en) * 1972-06-08 1976-06-09 Alcan Res & Dev Production of lithographic plates
DE2250275A1 (de) * 1972-10-13 1974-04-25 Oce Van Der Grinten Nv Verfahren zur elektrochemischen behandlung von aluminium zur herstellung lithographischer druckplatten
US3963594A (en) * 1975-06-03 1976-06-15 Aluminum Company Of America Electrochemical treatment of aluminum surfaces with an aqueous solution of hydrochloric acid and gluconic acid
US4140599A (en) * 1975-06-04 1979-02-20 Fujitsu Limited Process for producing porous aluminum anode element
GB1548689A (en) * 1975-11-06 1979-07-18 Nippon Light Metal Res Labor Process for electrograining aluminum substrates for lithographic printing
US4072589A (en) * 1977-04-13 1978-02-07 Polychrome Corporation Process for electrolytic graining of aluminum sheet
JPS5926480B2 (ja) * 1978-03-27 1984-06-27 富士写真フイルム株式会社 平版印刷版用支持体
US4177744A (en) * 1978-07-28 1979-12-11 The Singer Company Digital override control of bight and feed in a sewing machine
DE2836803A1 (de) * 1978-08-23 1980-03-06 Hoechst Ag Verfahren zur anodischen oxidation von aluminium und dessen verwendung als druckplatten-traegermaterial
GB2047274B (en) * 1979-03-29 1983-05-25 Fuji Photo Film Co Ltd Support for lithographic printing plates and process for their production
JPS55158298A (en) * 1979-05-30 1980-12-09 Fuji Photo Film Co Ltd Manufacture of support for lithographic plate
JPS5629699A (en) * 1979-08-15 1981-03-25 Fuji Photo Film Co Ltd Surface roughening method by electrolysis
US4324841A (en) * 1979-08-24 1982-04-13 Polychrome Corporation Lithographic substrates
US4297184A (en) * 1980-02-19 1981-10-27 United Chemi-Con, Inc. Method of etching aluminum
US4396468A (en) * 1981-12-21 1983-08-02 American Hoechst Corporation Three phase graining of aluminum substrates

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1496956A1 (de) * 1965-03-15 1969-11-27 Paehr Dr Hans Werner Verfahren zur AEtzung von Metallbaendern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171835A3 (en) * 1984-07-16 1986-10-08 North American Philips Corporation A process of etching aluminium anode foil for high voltage electrolytic capacitors
EP0661390A1 (fr) * 1993-12-28 1995-07-05 Nihon Chikudenki Kogyo Kabushiki Kaisha Procédé de décapage d'une feuille d'aluminium pour condensateur électrolytique

Also Published As

Publication number Publication date
DE3372001D1 (en) 1987-07-16
DE3217499A1 (de) 1983-11-10
BR8302397A (pt) 1984-01-10
CA1209522A (fr) 1986-08-12
US4468295A (en) 1984-08-28
AU550815B2 (en) 1986-04-10
AU1430083A (en) 1983-11-17
EP0093961B1 (fr) 1987-06-10
JPS58207374A (ja) 1983-12-02
JPH0568560B2 (fr) 1993-09-29

Similar Documents

Publication Publication Date Title
EP0292801B1 (fr) Procédé de grainage électrochimique de l'aluminium pour supports pour plaques d'impression
EP0093960B1 (fr) Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression
EP0121880B1 (fr) Procédé en deux pas pour la préparation de matériaux anodisés d'aluminium en forme plane et leur utilisation dans la fabrication de planches à imprimer offset
EP0008440B1 (fr) Procédé d'oxydation anodique d'aluminium et son application comme support de plaque d'impression
EP0004569B1 (fr) Procédé d'oxydation anodique de l'aluminium et son utilisation comme matériau porteur pour plaques d'impression
EP0105170B1 (fr) Procédé de posttraitement de couches d'oxyde d'aluminium avec des solutions aqueuses contenant du silicate alcalin et son application dans la fabrication des supports pour plaques d'impression
EP0149833B1 (fr) Procédé pour rendre rugueux électrolytiquement des plaques d'impression en aluminium dans un électrolyte composite aqueux
EP0162283B1 (fr) Procédé de grainage électrochimique d'aluminium pour supports de plaques d'impression dans un électrolyte composite aqueux
EP0093961B1 (fr) Procédé de grainage électrochimique de l'aluminium pour des supports de plaques d'impression
EP0162281B1 (fr) Procédé de grainage électrochimique d'aluminium pour supports de plaques d'impression dans un électrolyte composite aqueux
EP0437761A2 (fr) Procédé pour le grainage électrochimique de plaques d'impression en aluminium
EP0151304B1 (fr) Procédé pour rendre rugueux électrolytiquement des plaques d'impression en aluminium dans un électrolyte composite aqueux
EP0194428B1 (fr) Procédé de grainage électrochimique de l'aluminium pour substrats de plaques d'impression
DE3533532A1 (de) Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger
EP0150464B1 (fr) Procédé pour rendre rugueux électrolytiquement des plaques d'impression en aluminium dans un électrolyte composite aqueux
EP0086957B1 (fr) Procédé pour la production de matériaux de support pour des plaques d'impression offset
EP0194429A2 (fr) Procédé de grainage électrochimique de l'aluminium pour substrats de plaques d'impression
EP0086956A2 (fr) Procédé pour la production de matériaux de support pour des plaques d'impression offset
EP0161461B1 (fr) Procédé d'oxydation anodique d'aluminium et son application comme matériau de support pour plaques d'impression offset
EP0170045B1 (fr) Procédé pour le décapage et le chromage simultanés de plaques d'acier comme supports pour des utilisations lithographiques
EP0268058B1 (fr) Procédé de décapage électrochimique de l'aluminium ou ses alliages pour supports pour plaques d'impression
EP0162282B1 (fr) Procédé de grainage électrochimique d'aluminium pour supports de plaques d'impression dans un électrolyte composite aqueux
EP0167087A1 (fr) Procédé pour le décapage électrochimique de plaques d'acier pour l'utilisation comme supports pour plaques d'impression offset ainsi qu'une solution électrolytique appropriée à ce procédé

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19840330

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB NL

REF Corresponds to:

Ref document number: 3372001

Country of ref document: DE

Date of ref document: 19870716

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19900322

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19911230

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19980325

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19980327

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19980514

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990428

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19990428

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19991101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000201