EP0536531B1 - Procédé de grainage d'aluminium ou d'alliages d'aluminium pour supports plaques d'impression et une plaque d'impression - Google Patents

Procédé de grainage d'aluminium ou d'alliages d'aluminium pour supports plaques d'impression et une plaque d'impression Download PDF

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Publication number
EP0536531B1
EP0536531B1 EP92115022A EP92115022A EP0536531B1 EP 0536531 B1 EP0536531 B1 EP 0536531B1 EP 92115022 A EP92115022 A EP 92115022A EP 92115022 A EP92115022 A EP 92115022A EP 0536531 B1 EP0536531 B1 EP 0536531B1
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EP
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Prior art keywords
roughening
electrolyte
stage
acid
process according
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EP92115022A
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German (de)
English (en)
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EP0536531A3 (en
EP0536531A2 (fr
Inventor
Michael Dr. Brenk
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Agfa Gevaert AG
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Agfa Gevaert AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C3/00—Reproduction or duplicating of printing formes
    • B41C3/02—Stereotyping
    • 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
    • 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
    • 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
    • Y10S204/08—AC plus DC

Definitions

  • the invention relates to a method for roughening aluminum or aluminum alloys as a carrier material for printing plates, in which two electrochemical roughening steps and a pickling step are carried out in succession, and a printing plate made of a carrier material which is produced by the method.
  • Printing plates especially offset printing plates, generally consist of a support and at least one radiation-sensitive layer arranged thereon, this layer being applied to the layer support by non-pre-coated plates by the consumer or by the manufacturer in the case of pre-coated plates.
  • Aluminum or one of its alloys has established itself as a layer support in the printing plate field.
  • these supports 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 graining or etching, chemical or electrochemical oxidation and / or treatment with hydrophilizing agents.
  • the roughening can be carried out in aqueous acids, e.g. B. aqueous HCl or HNO 3 solutions, or in aqueous salt solutions, for. B. aqueous NaCl or Al (NO 3 ) 3 solutions, using alternating current.
  • the roughness depths of the roughened surface which can be achieved in this way, given, for example, as mean roughness depths R z , are in the range from 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 arithmetic mean of the individual roughness depths of five adjacent individual measuring sections is calculated as the average roughness depth R z .
  • the roughening takes place u. a. to improve the adhesion of the reproduction layer on the substrate and the dampening solution of the printing plate resulting from the printing plate by exposure and development.
  • the water flow is an important quality feature for offset printing plates. It is defined as the dosage and control in the publication "Determining an optimal water flow to increase the performance of offset printing” (Albrecht, J .; Rebner, W., Wirz, B., West Germanr Verlag, Cologne and Opladen 1966, page 7) the moistening of the printing form during the print run.
  • the water flow depends, among other things, on the surface roughness of the printing form, ie the grain size of the surface.
  • the problems of inadequate water supply are well known: If too much water is required to keep the non-printing parts of a printing form free of ink, more water can get into the ink emulsify, the pressure becomes flat. Watermarks may also occur, causing the paper to become damp.
  • the fountain solution consumption of a printing plate can be measured objectively with sufficient accuracy, but not the fountain solution guidance, since it is responsible for some of the above-mentioned disadvantageous phenomena, e.g. B. smearing, there is no objective measurement method (Decker, P., in "Contribution to analysis ", page 18). Therefore, the dampening solution guidance of a printing plate is assessed qualitatively with the adjectives "very good”, “good”, “satisfactory”, “sufficient”, “moderate”, “bad”, “very bad”. It will be described later under the explanation of the examples under which conditions these adjectives are used as a basis for the assessment.
  • Another quality feature of an offset printing plate is the brightness and the uniformity of the brightness of the carrier material.
  • the brightness can be measured as described in the DIN standard 6174 in the version from January 1979. It also mentions how the uniformity of the color impression can be quantified.
  • the value ⁇ E ab * which can be calculated from the three color values L *, a * and b *, serves as a measure of the uniformity.
  • a carrier must not be too dark so that too much of the incident light is not absorbed by the carrier surface itself and is thus lost in the actual light-sensitive layer for photochemical reactions.
  • the surface should also be uniformly bright so that the sensitivity to light does not vary from place to place on the printing plate.
  • DE-A-39 10 450 discloses a method for the electrochemical roughening of the surface of an aluminum carrier plate in an acid electrolyte which contains nitric acid using an alternating current.
  • the method comprises a single roughening step and can be used in combination and in combination with known electrochemical surface roughening treatments. This is understood to mean a combination with an electrolytic cell, with an electric current of a different frequency, a surface roughening treatment in which a detoxification treatment is used, or a method in which the electrochemical surface roughening is carried out with divided treatment cells.
  • the electrolyte used has no additives apart from the acid.
  • EP-A-0 437 761 describes a method for roughening aluminum or its alloys for printing plate supports, in which in a roughening step electrochemical roughening is carried out by means of an alternating current in an acidic, sulfate and chloride ion-containing electrolyte which contains chloride ions in the form of Contains aluminum chloride.
  • electrochemical roughening is carried out by means of an alternating current in an acidic, sulfate and chloride ion-containing electrolyte which contains chloride ions in the form of Contains aluminum chloride.
  • a mechanical dry or wet roughening or electrochemical roughening by means of alternating current in an electrolyte which contains hydrochloric acid and aluminum ions, nitric acid and aluminum ions or sulfuric acid and chloride ions.
  • a pickling step takes place after the first roughening step, which is followed by a second roughening step in an electrolyte.
  • the temperature variation between 16 ° C and 90 ° C shows a changing influence only from about 50 ° C, which is noticeable, for example, by the sharp decline in the formation of layers on the surface.
  • the roughening time between 2 and 25 min 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.
  • the acid concentration is in the range of 0.5 and 2% HCI, only insignificant changes occur in the hole structure below 0.5% HCl, there is only a local attack on the surface and, at high values, an irregular dissolution of aluminum.
  • pulsed direct current is used instead of alternating current, it turns out that obviously both types of half-wave are required for a uniform roughening.
  • the addition of sulfate ions increasingly leads to undesired, coarse, non-homogeneous roughening structures which are not suitable for lithographic purposes.
  • DE-A 35 03 927 describes ammonium chloride as an inorganic additive to an HCl electrolyte.
  • JP-B 16 918/82 are the combination of a pre-structuring which takes place mechanically in the first step, followed by one any chemical cleaning (pickling) that takes place with an electrochemical roughening by means of modified alternating current in electrolytes containing hydrochloric or nitric acid is described, wherein a further cleaning step can then take place.
  • US-A 4 437 955 discloses a two-stage electrochemical roughening process for the production of capacitors with an electrolyte containing hydrochloric acid in the first step and an electrolyte containing chloride and sulfate ions in the second step.
  • the second stage electrolyte is not acidic, and DC is used in this stage.
  • DE-A 38 36 810 describes a process in which aluminum is also roughened in two steps for the production of printing plate supports. Pickling is carried out there between the first and the second roughening step. This method has the disadvantage that the plates, especially when chloride-containing electrolytes are used in the last pickling step, become superficially uneven and quite dark.
  • the object of the present invention is to improve a method for roughening aluminum for printing plate supports of the type described at the outset such that, in addition to a uniformly bright, very fine, scar-free, area-covering roughening structure of the aluminum surface of the printing plate supports, very good reprographic and printing properties, in particular high ones Print runs of the finished printing forms can be obtained.
  • the pickling step removes unwanted deposits that cover the surface make uneven and dark, removed from the surface of the substrate.
  • the process can be carried out discontinuously or continuously with strips made of aluminum or its alloys.
  • the process parameters in the continuous process during the roughening step are in the following ranges: the temperature of the electrolyte between 20 and 80 ° C, the current density between 3 and 180 A / dm 2 , the residence time of a material point to be roughened in the electrolyte between 5 and 300 s and the electrolyte flow rate at the surface of the material to be roughened between 5 and 200 cm / s. Due to the continuous driving style and the simultaneous release of Al ions and the consumption of H + , constant adjustment of the electrolyte composition by the corresponding diluted acids is necessary.
  • the required current densities are between 3 and 40 A / dm 2 and the residence times between 30 and 300 s.
  • the flow of the electrolyte can also be dispensed with.
  • the process can also be used successfully with other aluminum alloys.
  • an anodic oxidation of the aluminum takes place, for example, which improves the abrasion and adhesion properties of the surface of the carrier material.
  • the following processes can also be used, for example: the anodic oxidation of aluminum in an aqueous electrolyte containing H 2 SO 4 , the Al 3+ ion content of which is greater than 12 g / l is set in an aqueous electrolyte containing H 2 SO 4 and H 3 PO 4 or in an aqueous electrolyte containing H 2 SO 4 , H 3 PO 4 and Al 3+ ions.
  • 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.
  • the layer weights of aluminum oxide range from 1 to 10 g / m 2 , corresponding to a layer thickness of approximately 0.3 to 3.0 ⁇ m.
  • a modifying treatment can also be applied, which causes a surface removal from the roughened surface.
  • This treatment can be carried out in both acidic and basic media.
  • Such a modifying intermediate treatment provides by removing fine structures and. a. a uniformly bright surface, and the surface improves the water flow of the panels.
  • the anodic oxidation of the aluminum printing plate support material can be followed by one or more post-treatment stages.
  • Aftertreatment is understood to mean, in particular, a hydrophilizing chemical or electrochemical treatment of the aluminum oxide layer, for example immersion treatment of the material in an aqueous polyvinylphosphonic acid solution, immersion treatment in an aqueous alkali silicate solution or electrochemical treatment (anodization) in an aqueous alkali silicate solution.
  • post-treatment stages serve in particular to additionally increase the hydrophilicity of the aluminum oxide layer, which is already sufficient for many areas of application, without impairing the other known properties of this layer.
  • a carrier material produced by the method according to the invention becomes a printing plate by coating with a light-sensitive layer.
  • all layers are suitable as light-sensitive reproduction layers which, after exposure, subsequent development and / or fixing, provide an image-like area from which printing can take place and / or which represent a relief image of an original.
  • the reproduction layers are either at the manufacturer applied by presensitized printing plates or directly by the consumer on one of the usual carrier materials.
  • the light-sensitive reproduction layers include such as z. B. in "Light-Sensitive Systems” by Jaromir Kosar, John Wiley & Sons Verlag, New York 1965, are described: The layers containing unsaturated compounds in which these compounds are isomerized, rearranged, cyclized or crosslinked during exposure (Kosar, chapter 4), such as B.
  • Cinnamate the layers containing photopolymerizable compounds, in which monomers or prepolymers optionally polymerize during exposure by means of an initiator (Kosar, Chapter 5); and the layers containing o-diazo-quinones such as naphthoquinonediazides, p-diazo-quinones or diazonium salt condensates (Kosar, Chapter 7).
  • o-diazo-quinones such as naphthoquinonediazides, p-diazo-quinones or diazonium salt condensates
  • Suitable layers also include the electrophotographic layers, i. H. those containing an inorganic or organic photoconductor.
  • these layers can of course also contain other components, e.g. B. resins, dyes, pigments, wetting agents, sensitizers, adhesion promoters, indicators, plasticizers or other conventional auxiliaries.
  • photoconductive layers such as z. B. in DE-C 11 17 391, 15 22 497, 15 72 312, 23 22 046 and 23 22 047 are described, are applied to the support materials, whereby highly light-sensitive, electrophotographic layers are formed.
  • the materials for printing plate supports roughened by the method according to the invention have a uniform brightness and a very uniform topography, which has a positive influence on the print run stability and the dampening solution guidance when printing printing forms made from these supports.
  • Undesirable "scars" occur less frequently, which form distinctive depressions compared to the roughening of the surroundings; these can even be completely suppressed.
  • An aluminum support material is first pickled for 60 s in an aqueous solution containing 20 g / l NaOH at room temperature.
  • the roughening takes place in the specified electrolyte systems of the roughening stages A, B, C, D by combining two roughening steps, all possible combinations of the electrolyte systems of the roughening steps A to D, including the combination of one of the roughening steps with themselves, e.g. B. A-A, B-B, C-C, D-D, is possible.
  • the classification into the quality classes taking into account the surface topography with regard to uniformity, freedom from scars and area coverage, is carried out by visual assessment under a microscope, whereby a homogeneously roughened and scar-free surface is assigned quality level "10" (best value).
  • Quality level "0" (worst value) is assigned to a surface with thick scars of more than 30 ⁇ m in size and / or an extremely unevenly roughened or almost bare surface.
  • Another criterion for the quality is the brightness and the uniformity of the brightness of the carrier surface, which are given as L-value and ⁇ E-value in the tables below.
  • L-value and ⁇ E-value are given as L-value and ⁇ E-value in the tables below. The greater the L value, the greater the brightness, and the greater the ⁇ E value, the more the brightness fluctuates from place to place on the carrier surface.
  • Column 2 of the following tables shows the roughening process used in the first step, columns 3 and 4 the roughening time and the current density, column 5 the roughening process used in the second step, columns 6 and 7 the roughening time and the current density, the column 8 contains the L value explained above, the one The measure of the brightness is, and column 9 contains the classification of the carrier in quality classes, which was explained in the previous section, column 10 shows the uniformity ⁇ E of the brightness.
  • the supports are still alkaline pickled in a third step after both roughening steps.
  • an aqueous solution of 20 g / l NaOH and 2 g / l sodium carbonate (anhydrous) at room temperature of 20 to 24 ° C. is used as the pickling solution.
  • the concentration of both salt and acid can be varied.
  • the temperature or the pickling time may have to be adjusted.
  • the pickling time is 15 s, but can be between 5 and 120 s. Under no circumstances should it be longer than 300 s in this pickling solution.
  • Time s Current density A / dm 2 method Time s Current density A / dm 2 Brightness L ⁇ grade ⁇ E 1 A 20th 100 D 15 40 65.5 7 0.4 2nd A 20th 100 D 20th 40 69.2 7 0.3 3rd C. 10th 40 B 15 40 71.4 10th 0.3 4th C. 10th 40 B 20th 40 80.0 10th 0.6 5 B 30th 60 D 10th 40 83.4 7 0.8 6 C.
  • Table 2 contains comparative examples of supports that were not made according to the methods of the invention. Except for the pickling step after the two roughening steps, the carriers were produced under identical conditions as the carriers of Table 1. Instead of the pickling step after the two roughening steps, a pickling step was inserted between the two roughening steps.
  • This pickling step not listed in Table 2 is an alkaline pickling. In this case, an aqueous solution of 20 g / l NaOH and 2 g / l sodium carbonate (anhydrous) at room temperature from 20 to 24 ° C. was used as the pickling solution. The diving time was 30 s. The poorer quality of the carriers can be seen from Table 2 in comparison to Table 1.
  • the carriers are darker than those produced according to the invention, the brightness is more irregular.
  • Table 2 1st roughening step 2nd roughening step 1 2nd 3rd 4th 5 6 7 8th 9 10th No. method Time s Current density A / dm 2 method Time s Current density A / dm 2 Brightness L ⁇ grade ⁇ E V1 A 20th 100 D 15 40 59.5 6 3.4 V2 A 20th 100 D 20th 40 59.2 5 2.3 V3 C. 10th 40 B 15 40 59.4 4th 2.3 V4 C. 10th 40 B 20th 40 60.0 5 6.6 V5 B 30th 60 D 10th 40 59.9 6 3.1 V6 C.
  • Table 3 again contains comparative examples which were not produced by the process according to the invention. Here no pickling was carried out between the two roughening steps nor after the roughening steps. The supports are overall more uneven than the comparative examples in Table 2, the supports of which were pickled after the first roughening step.
  • Table 3 1st roughening step 2nd roughening step 1 2nd 3rd 4th 5 6 7 8th 9 10th No. method Time s Current density A / dm 2 method Time s Current density A / dm 2 Brightness L ⁇ grade ⁇ E V26 A 20th 100 D 15 40 58.5 6 3.0 V27 A 20th 100 D 20th 40 58.2 5 3.3 V28 C. 10th 40 B 15 40 57.4 4th 3.3 V29 C.
  • Examples V51 to V54 in the table above are supports which have been subjected to roughening in only one stage.
  • Table 4 shows the results of supports which were roughened in the same way as the supports in Table 1. They differ from those described in Table 1 by the pickling.
  • the carriers are pickled in a third processing step after both roughening steps.
  • an aqueous solution of 100 g / l H 2 SO 4 and 5 g / l aluminum sulfate (anhydrous) at 45 ° C. is used as the pickling solution.
  • concentrations can be varied.
  • the acid concentration can range from 10g / l to 500g / l, the aluminum concentration can also be changed. With low acid concentrations, it is advisable to increase the temperature.
  • the pickling time is 60 s, but can be between 10 and 300 s.
  • Table 4 1st roughening step 2nd roughening step 1 2nd 3rd 4th 5 6 7 8th 9 10th No. method Time s Current density A / dm 2 method Time s Current density A / dm 2 Brightness L ⁇ grade ⁇ E 26 A 20th 100 D 15 40 64.5 7 0.6 27 A 20th 100 D 20th 40 68.2 7 0.4 28 C. 10th 40 B 15 40 69.8 10th 0.8 29 C. 10th 40 B 20th 40 79.5 10th 0.9 30th B 30th 60 D 10th 40 83.0 7 0.7 31 C.
  • Table 6 shows the results of some printing forms which were produced from supports not according to the invention and which do not match the printing forms in Table 5 either in the print run or in the water flow.
  • Table 6 carrier Edition Water supply V1 80,000 satisfying V5 60,000 bad V31 150,000 very bad V21 30,000 Well V33 90,000 bad V38 30,000 bad V48 145,000 bad V51 120,000 bad V52 140,000 very bad V53 80,000 satisfying V54 60,000 satisfying

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
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Claims (17)

  1. Procédé pour le grenage d'aluminium ou d'alliages d'aluminium comme matériau de support pour des plaques d'impression, dans lequel on réalise deux étapes de grenage électrochimique et une étape de décapage les unes derrières les autres, de telle sorte que
    - une première étape de grenage électrochimique a) se fait dans un électrolyte qui est choisi dans le groupe qui contient l'acide chlorhydrique, nitrique, sulfurique des additifs d'ions chlorure ou nitrate d'un sel d'aluminium ;
    - une deuxième étape de grenage électrochimique b) suit la première étape de grenage a) et est réalisée dans un électrolyte qui est choisi parmi l'acide chlorhydrique, nitrique, sulfurique et des additifs d'ions chlorure ou nitrate d'un sel d'aluminium et dans laquelle les concentrations des additifs choisis sont identiques à ou différentes de celles de la première étape de grenage ;
    - on réalise l'étape de décapage c) qui est un décapage purement chimique, dans un bain acide ou alcalin après la deuxième étape de grenage b) et on détermine les étapes de grenage a) et b) et l'étape de décapage c) les unes par rapport aux autres, de telle sorte qu'on obtienne une luminosité de surface L = 60 à L = 90 et une variation de la luminosité du matériau de support qui n'est pas supérieure à υEab* = 2, les valeurs pour la luminosité et la variation étant mesurées selon la norme DIN 6174 (janvier 1979).
  2. Procédé selon la revendication 1, caractérisé en ce que les étapes a) et b) comprennent les étapes de grenage identiques ou différentes qui sont choisies parmi des étapes de grenage A, B, C et D, l'étape de grenage A étant réalisée dans un électrolyte qui contient de l'acide chlorhydrique et du chlorure d'aluminium, B dans un électrolyte qui contient de l'acide nitrique et du nitrate d'aluminium et C et D dans un électrolyte qui contient de l'acide sulfurique et du chlorure d'aluminium.
  3. Procédé selon la revendication 2, caractérisé en ce que les étapes de grenage a) et b) électrochimiques se font en continu pendant les étapes de grenage A, B, C, D, la température de l'électrolyte dans l'étape de grenage individuelle étant comprise entre 20 et 80°C, la densité de courant entre 3 et 180 A/dm2, le temps de séjour d'un endroit du matériau de support à grener dans l'électrolyte de 5 à 300 s et la vitesse d'écoulement de l'électrolyte sur la surface du matériau de support de 5 à 200 cm/s.
  4. Procédé selon la revendication 2, caractérisé en ce que les étapes de grenage a) et b) électrochimiques se font en discontinu pendant les étapes de grenage A, B, C, D, la température de l'électrolyte dans l'étape de grenage individuelle étant comprise entre 20 et 80°C, la densité de courant entre 3 et 40 A/dm2, le temps de séjour d'un endroit du matériau de support à grener dans l'électrolyte de 30 à 300 s.
  5. Procédé selon les revendications 1 à 4, caractérisé en ce qu'on applique aux bains d'électrolytes et aux matériaux de support dans les étapes de grenage A, B, C, D des tensions alternatives sinusoïdales avec une fréquence de réseau ou des tensions alternatives superposées de fréquence plus faible que la fréquence du réseau.
  6. Procédé selon la revendication 3, caractérisé en ce qu'on conserve la composition de l'électrolyte constante par réapprovisionnement permanent des acides dilués correspondants dans les électrolytes des étapes de grenage individuelles.
  7. Procédé selon la revendication 2, caractérisé en ce qu'on réalise l'étape de grenage A dans un électrolyte qui contient 10 g/l de HCl et 65 g/l de chlorure d'aluminium (AlCl3·6H2O), à une température de 35°C, avec un temps de séjour de 10 à 30 s et une densité de courant de 40 à 100 A/dm2.
  8. Procédé selon la revendication 2, caractérisé en ce qu'on réalise l'étape de grenage B dans un électrolyte qui contient 9 g/l d'acide nitrique et 67 g/l de nitrate d'aluminium [Al(NO3)3·9H2O], à une température de 40°C, avec un temps de séjour de 15 à 30 s et une densité de courant de 40 à 80 A/dm2.
  9. Procédé selon la revendication 2, caractérisé en ce qu'on réalise l'étape de grenage C dans un électrolyte qui contient 28 g/l d'acide sulfurique et 100 g/l de chlorure d'aluminium [AlCl3·6H2O], à une température de 45°C, avec un temps de séjour de 10 à 30 s et une densité de courant de 40 à 100 A/dm2.
  10. Procédé selon la revendication 2, caractérisé en ce qu'on réalise l'étape de grenage C dans un électrolyte qui contient 25 g/l d'acide sulfurique et 130 g/l de chlorure d'aluminium [AlCl3·6H2O], à une température de 40°C, avec un temps de séjour de 8 à 40 s et une densité de courant de 35 à 90 A/dm2.
  11. Procédé selon la revendication 1, caractérisé en ce qu'on réalise une oxydation anodique du matériau de support à la fin du grenage dans un électrolyte qui contient de l'acide sulfurique, de l'acide phosphorique, de l'acide oxalique, de l'acide amidosufonique, de l'acide sulfosuccinique, de l'acide sulfosalicylique ou des mélanges de ceux-ci.
  12. Procédé selon la revendication 1, caractérisé en ce que dans l'étape de décapage c) la solution de décapage est une solution aqueuse-acide de 10 à 500 g/l, en particulier de 100 g/l de H2SO4 et de 3 à 20 g/l, en particulier de 5 g/l de sulfate d'aluminium exempt d'eau et en ce que la durée du décapage est de 10 à 300 s, en particulier de 60 s, à une température de 45°C.
  13. Procédé selon la revendication 1, caractérisé en ce que dans l'étape de décapage c) la solution de décapage est une solution aqueuse-alcaline de 10 à 100 g/l, en particulier de 20 g/l de NaOH et de 2 g/l de carbonate de sodium exempt d'eau et en ce que la durée du décapage est de 5 à 120 s, en particulier de 15 s, à une température ambiante de 20 à 24°C.
  14. Procédé selon la revendication 11, caractérisé en ce que l'oxydation anodique du matériau de support grené se fait avec du courant continu, du courant alternatif ou avec une combinaison de courant continu avec du courant alternatif superposé.
  15. Procédé selon la revendication 14, caractérisé en ce qu'après l'oxydation anodique qui mène à des poids de couches de 1 à 10 g/m2 en oxyde d'aluminium, correspondant à une épaisseur de couche d'environ 0,3 à 3,9 µm, suit (suivent) une ou plusieurs étape(s) de traitement chimique ou électrochimique hydrophilisant de la couche d'oxyde d'aluminium par traitement par immersion dans une solution aqueuse d'acide polyvinylphosphonique, une solution aqueuse de silicate d'alcali ou par une anodisation dans une solution aqueuse de silicate d'alcali.
  16. Plaque d'impression constituée d'un matériau de support qui a été préparé selon l'une ou plusieurs quelconques des revendications 1 à 15, caractérisée en ce que le matériau de support est revêtu d'une solution de la composition suivante :
    6,6 parties en poids de crésol-formaldéhyde-Novolaque présentant un domaine d'amollissement de 105 à 120°C,
    1,1 partie en poids de l'ester 4-(2-phénylprop-2-yl)-phénylique de l'acide naphtoquinone-(1,2)-2-diazido-4-sulfonique,
    0,6 partie en poids de 2,2'-bis-(naphtoquinone-(1,2)-2-diazido-5-sulfonyloxy)-1,1'-dinaphtylméthane,
    0,24 partie en poids de 4-sulfochlorure de naphtoquinone-(1,2)-2-diazide,
    0,08 partie en poids de violet cristallisé,
    91,36 parties en poids d'un mélange de solvants constitué de 4 parties en volume d'éthylèneglycolmonométhyléther, de 5 parties en volume de tétrahydrofurane et de 1 partie en volume d'acétate de butyle.
  17. Plaque d'impression selon la revendication 16, caractérisée en ce que le séchage du matériau de support revêtu se fait à des températures allant jusqu'à 120°C.
EP92115022A 1991-09-09 1992-09-03 Procédé de grainage d'aluminium ou d'alliages d'aluminium pour supports plaques d'impression et une plaque d'impression Expired - Lifetime EP0536531B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129909A DE4129909A1 (de) 1991-09-09 1991-09-09 Verfahren zum aufrauhen von aluminium bzw. von aluminiumlegierungen als traegermaterial fuer druckplatten und eine druckplatte
DE4129909 1991-09-09

Publications (3)

Publication Number Publication Date
EP0536531A2 EP0536531A2 (fr) 1993-04-14
EP0536531A3 EP0536531A3 (en) 1993-04-28
EP0536531B1 true EP0536531B1 (fr) 1997-03-05

Family

ID=6440183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92115022A Expired - Lifetime EP0536531B1 (fr) 1991-09-09 1992-09-03 Procédé de grainage d'aluminium ou d'alliages d'aluminium pour supports plaques d'impression et une plaque d'impression

Country Status (6)

Country Link
US (1) US5304298A (fr)
EP (1) EP0536531B1 (fr)
JP (1) JPH05278361A (fr)
KR (1) KR930005783A (fr)
CA (1) CA2077306A1 (fr)
DE (2) DE4129909A1 (fr)

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EP1157853A3 (fr) * 2000-05-24 2005-01-05 Hydro Aluminium Deutschland GmbH Procédé de grainage d'un support pour plaques d'impréssion
KR101835178B1 (ko) 2015-01-05 2018-03-06 씨제이제일제당 (주) 즉석 조리용 생당면의 제조방법 및 이로부터 제조된 생당면

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Also Published As

Publication number Publication date
US5304298A (en) 1994-04-19
CA2077306A1 (fr) 1993-03-10
JPH05278361A (ja) 1993-10-26
EP0536531A3 (en) 1993-04-28
DE59208104D1 (de) 1997-04-10
KR930005783A (ko) 1993-04-20
EP0536531A2 (fr) 1993-04-14
DE4129909A1 (de) 1993-03-11

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