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EP0118740B1 - Plaques, pellicules ou matériel en formes de bandes, en aluminum grainé par voie mécanique et électrochimique, procédé pour leur fabrication, et emploi comme support pour plaques pour l'impression lithographique - Google Patents

Plaques, pellicules ou matériel en formes de bandes, en aluminum grainé par voie mécanique et électrochimique, procédé pour leur fabrication, et emploi comme support pour plaques pour l'impression lithographique Download PDF

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Publication number
EP0118740B1
EP0118740B1 EP84101145A EP84101145A EP0118740B1 EP 0118740 B1 EP0118740 B1 EP 0118740B1 EP 84101145 A EP84101145 A EP 84101145A EP 84101145 A EP84101145 A EP 84101145A EP 0118740 B1 EP0118740 B1 EP 0118740B1
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EP
European Patent Office
Prior art keywords
mechanically
roughened
radiation
aluminum
range
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.)
Expired
Application number
EP84101145A
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German (de)
English (en)
Other versions
EP0118740A3 (en
EP0118740A2 (fr
Inventor
Kurt Dr. Dipl.-Chem. Reiss
Walter Dr. Dipl.-Phys. Niederstätter
Joachim Dipl.-Ing. Stroszynski
Dieter Dr. Dipl.-Chem. Bohm
Gerhard Dr. Dipl.-Chem. Sprintschnik
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Hoechst AG
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Hoechst AG
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Publication date
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Priority to AT84101145T priority Critical patent/ATE46293T1/de
Publication of EP0118740A2 publication Critical patent/EP0118740A2/fr
Publication of EP0118740A3 publication Critical patent/EP0118740A3/de
Application granted granted Critical
Publication of EP0118740B1 publication Critical patent/EP0118740B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B41N3/04—Graining or abrasion by mechanical means
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12993—Surface feature [e.g., rough, mirror]

Definitions

  • the invention relates to a plate, film or ribbon-shaped material made of aluminum or its alloys with a surface that is first mechanically roughened on both sides and then electrochemically roughened, a process for its production and its use as a carrier material in the production of offset printing plates.
  • Backing materials for offset printing plates are provided either by the consumer directly or by the manufacturer of precoated printing plates on one or both sides with a radiation-sensitive layer (reproduction layer), with the aid of which a printing image of a template is generated photomechanically.
  • the layer support carries the image points which will guide the color during later printing and at the same time forms the hydrophilic background for the lithographic printing process at the non-image points (non-image points) during later printing.
  • aluminum, steel, copper, brass or zinc, but also plastic films or paper can be used as the base material for such layer supports. These raw materials are modified by suitable modifications such.
  • Additional requirements are imposed on the radiation-sensitive coated printing plate support, some of which interact with the requirements for the support material itself. These include, for example, a high sensitivity to radiation (light), good developability, clear contrasts after exposure and / or development, long print runs and reproduction that is as accurate as possible; increasingly play, especially in the case of printing plates with positive-working radiation-sensitive layers, a behavior of the radiation-sensitive layer that is as free of radiation as possible when irradiating (exposing) the printing plate and good (ie with as little water as possible and with the greatest possible fluctuation tolerance in the water requirement during printing) Water routing of the printing forms plays an important role.
  • the following publications are known from the prior art, for example, which provide solution contributions for individual requirements; this includes, on the one hand, generating elevations in or on the radiation-sensitive layer and, on the other hand, a combination of several roughening stages for the carrier material.
  • This matte layer generally is a layer of binder (for. Example, of a cellulose ether) with incorporated by dispersion therein, delustering particles, such as those made of Si0 2, ZnO, Ti0 2, Zr0 2, glass, A1 2 0 3, starch or polymers.
  • a printing plate constructed in this way is intended to shorten the time required to achieve the most extensive and uniform possible contact between the film template and the radiation-sensitive layer during the exposure stage of the printing form production process.
  • a radiation-sensitive reproduction material which contains particles in the positive-working radiation-sensitive layer, the smallest dimension of which is at least as large as the thickness of the layer itself, whereby the type of particles corresponds qualitatively to that described in the previously described DE-OS.
  • Such a material is said to be suitable for all applications in which positive contact copies have to be made in a vacuum copying frame and in which high image resolution and faithful reproduction of the original are important; in particular, it should show a lower tendency to under-radiation when copying, i. H.
  • under-radiation lateral and oblique radiation incidence
  • the process for producing a support for lithographic printing plates according to DE-OS-3 012 135 is carried out in at least three stages, with a) the aluminum plate being mechanically roughened, b) from the roughened surface 5 to 20 g / m 2 are removed and c) an electrochemical roughening with an electric current of alternating waveform is carried out in an aqueous acid solution, and this current must have certain parameters. After the electrochemical roughening, further ablation treatment and also anodic oxidation of the roughened surface can follow.
  • the surface topography of the support must look such that the surface in the primary structure shows even hills, overlaid by a secondary structure that shows pinholes, the respective bisecting axis of which is approximately perpendicular to the tangent to the outer surface of the hill.
  • the statistical distribution of the diameter of the pinholes is approximately such that 5% of the holes have a diameter D 5 of at most 3 ⁇ m and 95% of the holes have a diameter D 95 of at most 7 ⁇ m, ie the majority of the holes are in the range between 3 and 7 1 1m, in particular between 5 and 7 microns.
  • the density of the pinholes is approximately 10 6 to 10 8 holes per cm 2 .
  • the average roughness value R of the mechanically roughened aluminum is 0.4 to 1.0 ⁇ m before the ablation treatment stage.
  • JP-OS-123 204/78 (application no. 38238/77, published October 27, 1978) also describes the combination of mechanical roughening by nylon brushes and aqueous pumice stone dispersion and electrochemical roughening for printing plate support materials made of aluminum. Ablative treatment is performed after both roughening stages have been completed, but not between them.
  • the aluminum printing plate support material according to US Pat. No. 2,344,510 is first roughened mechanically, in particular by wire brushing, and then roughened chemically or electrochemically.
  • the finer roughening pattern of the chemical or electrochemical roughening should overlap the medium-fine roughening pattern of the mechanical roughening.
  • a cleaning stage is switched on, which is carried out with a 5% strength aqueous NaOH solution at 95 ° C.
  • the roughening electrolyte is an aqueous solution containing NaCl and HCl. After roughening, the material can also be anodized.
  • US Pat. No. 3,929,591 describes an aluminum printing plate carrier material which is produced in three stages, namely a) mechanical roughening using a moist particle mass based on silicates, oxides or sulfates, b) electrochemical roughening Alternating current in an aqueous electrolyte containing phosphates or H 3 PO 4 , and c) anodic oxidation with direct current in an aqueous electrolyte containing H 2 SO 4 .
  • Level b) should lead to an increased reflection behavior of the surface of at least 5%. The topography of the surface is not qualified or quantified.
  • the object of the present invention is to propose a material made of aluminum, with the aid of which it is possible to produce offset printing plates which have radiation-sensitive layers and which show as little or no tendency to under radiation during the irradiation process in the copying frame and, moreover, good water flow when printing printing plates made from the plates exhibit.
  • the parameters a) D a1 are in the range from 2 to 4 ⁇ m, b) D a2 in the range from 0.3 to 0.8 ⁇ m with an average base area F from 200 to 1200 ⁇ m 2 , c) R a in the range of 0.8 to 1.2 ⁇ m and d) tp m ; (0.125) maximum at 15% and tp m ; (0.4) maximum at 60%.
  • Some of these parameters can already lie in the specified ranges in the case of commercially available carrier materials for offset printing plates, but no carrier material has yet been found which matches all of these parameters with the material according to the invention. This applies in particular to the “double structure” claimed according to the invention and its effects on the behavior of the printing plate or printing form.
  • the parameters characterizing the material according to the invention are defined as follows:
  • the roughening of the surface can be measured and analyzed using various methods. Standard methods include observation under a scanning electron microscope and instrument measurements such as with a roughness measuring device (profilometer), which scans a linear path on the plate with a highly sensitive needle.
  • a roughness measuring device profilometer
  • the diameter of the holes created by the roughening or the base area of the elevations are determined on the basis of photos which are taken, for example, with 240, 1200 or 6000 times magnification by means of a scanning electron microscope with an electron beam incident obliquely to the aluminum surface.
  • a representative area with at least 1000 holes is selected for the measurement for each sample.
  • the diameter of each hole is measured in the plane of the surface both parallel and perpendicular to the rolling axis or strip direction of the aluminum.
  • the arithmetic mean of the diameters in the parallel and vertical directions are calculated separately.
  • the arithmetic mean D a of the distribution of the hole diameters is calculated from the arithmetic mean of the hole diameters in a parallel and perpendicular direction.
  • D a1 is the arithmetic mean of the distribution of the hole diameters in the basic structure, D a2 accordingly in the superimposed structure.
  • the percentages of the basic structure and the superimposed structure from the surveys of the entire surface are also determined from these representative surface sections.
  • the surface roughness (see for example DIN 4768 in the version from October 1970 or DIN 4762 in the version from May 1978) is measured with a roughness measuring device (profilometer, stylus device with electrical transmission) over a representative measuring distance of at least 2 mm both parallel and perpendicular to Roll axis measured.
  • the mean roughness values are determined and calculated from the two measurements as the arithmetic mean of the absolute distance of all points on the surface of the roughness profile from the center line of the profile.
  • the average roughness value R a is then the average value of the average roughness values in the parallel and perpendicular directions.
  • the load share tp m is the ratio of the load-bearing length of the roughness profile to the measuring section of the roughness profile in the respectively selected depth of cut of 0.125 ⁇ m or 0.4 ⁇ m in%, ie in the present case tp mi (0.125) is less than tpm (0.4); the load share tp mi is also the average value of the load shares in the parallel and vertical direction;
  • the roughness profile is the difference between the palpated profile and the envelope line (path of the center of a center point of a ball rolling over the profile, which is generally formed electronically in a stylus device); the depth of cut indicates the distance from the envelope line of the bearing component is determined.
  • a curve drawn up from the load components can, for example, provide information about the behavior in use, too high, ie load components above the claimed values lead to less suitable materials in the present field of application.
  • the load share curve not only takes the profile depths into account, but also the profile shapes.
  • the parameters characterizing the invention are thus the hole diameter and its size distribution in the basic structure and the superimposed structure from elevations, the average base area of the elevations, the percentages of the basic structure and the superimposed structure on the entire roughened surface, and the surface roughness, characterized by the Average roughness values and the load share.
  • Suitable base materials for the material according to the invention include those made of aluminum or one of its alloys, which have, for example, a content of more than 98.5% by weight of Al and proportions of Si, Fe, Ti, Cu and Zn.
  • the base material is roughened on one or both sides first mechanically and then electrochemically, if appropriate after a preliminary cleaning, any type of mechanical and electrochemical roughening being suitable in principle, the combination of which results in the “double structure” according to the invention.
  • mechanical roughening processes can be used, for example brushing can also be counted a brushing with rotating, plastic bristle brushes using aqueous abrasive suspensions.
  • the electrochemical roughening step is generally carried out in aqueous acids as electrolytes, but neutral or acidic aqueous salt solutions can also be used, each of which can also contain additives with corrosion inhibitors.
  • the mean roughness value R should not be less than 0.5 ⁇ m and the load fraction t pmi (0.125) should not be more than 20%.
  • a process is used in particular in which the base material, if appropriate after a preliminary cleaning, is mechanically roughened on one or both sides by wire brushing, and then, if appropriate after a removal intermediate treatment in an alkaline or acidic aqueous solution, electrochemically in a hydrochloric acid and / or electrolyte containing nitric acid is roughened using alternating current.
  • Pre-cleaning includes, for example, treatment with aqueous NaOH solution with or without degreasing agent and / or complexing agents, trichlorethylene, acetone, methanol or other commercially available aluminum stains. Wire brushing has been used in the relevant field for years and requires no further explanation.
  • the ablating intermediate treatment which can optionally also be carried out electrochemically, is generally carried out using an aqueous alkali metal hydroxide solution or the aqueous solution of an alkaline salt or an aqueous acid solution based on HN0 3 , H 2 S0 4 or H 3 P0 4 at a removal rate of 5 g / m 2 .
  • Electrochemical roughening has also been used in practice for years.
  • the aqueous electrolyte preferably based on aqueous solutions containing HCl and / or HN0 3 , can contain corrosion-inhibiting or other additives such as HyS0 4 , Hy0 2 , H 3 P0 4 , H 2 Cr0 4 , HgBOg, gluconic acid, amines, diamines, surfactants or aromatic aldehydes can be added.
  • the process parameters in the roughening stage are in the following ranges: the temperature of the electrolyte between 20 and 60 ° C., the active substance (acid, salt) concentration between 2 and 100 g / l (in the case of salts also higher), the current density between 25 and 250 A / dm 2 , the residence time between 3 and 100 sec and the electrolyte flow rate in continuous.
  • Method on the surface of the workpiece to be treated between 5 and 100 cm / sec; AC is usually used as the type of current, but modified types of current such as AC with different amplitudes of the current strength are also possible for the anode and cathode currents.
  • the distribution of the hole sizes is generally more uniform than in processes without prior mechanical roughening.
  • This stage is carried out in such a way that the basic topography of the mechanically roughened surface, characterized by the mean roughness value and the load-bearing component, changes only relatively little, but a hole structure that is as closed as possible, caused by the electrochemical roughening, is additionally formed, so that the external appearance shows a basic structure for 60 to 90% of the surface with the hole diameter distribution given above and a structure which appears as a superimposed structure from elevations for 10 to 40% of the surface.
  • the frequency of the surveys is on average around 200 to 500, in particular 250 to 450, per mm 2 , but it can also vary up and down.
  • the electrochemical roughening can additionally be followed by a removal treatment with one of the solutions indicated in the intermediate treatment, in particular a maximum of 2 g / m 2 removal.
  • Direct current is preferably used for the anodic oxidation, but alternating current or a combination of these types of current (eg direct current with superimposed alternating current) can also be used; the electrolyte is in particular an aqueous solution containing H 2 S0 4 and / or H 3 P0 4 .
  • the layer weights of aluminum oxide range from 0.5 to 10 g / m 2 , corresponding to a layer thickness of approximately 0.15 to 3.0 ⁇ m.
  • 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 additionally increase the hydrophilicity of the aluminum oxide layer, which is already sufficient for many areas of application, the remaining known properties of this layer being at least retained.
  • the materials according to the invention are used in particular as supports for offset printing plates, i. H. a radiation-sensitive coating is applied to one or both sides of the carrier material either by the manufacturer of presensitized printing plates or directly by the consumer.
  • a radiation-sensitive coating is applied to one or both sides of the carrier material either by the manufacturer of presensitized printing plates or directly by the consumer.
  • all layers are suitable as radiation-sensitive layers which, after irradiation (exposure), possibly with a subsequent development and / or fixation, provide an imagewise surface from which printing can take place.
  • photoconductive layers such as z. B. in DE-PS 1 117 391, 1 522 497, 1 572 312, 2 322 046 and 2 322 047 are described, applied to the carrier materials produced according to the invention, whereby highly light-sensitive, electrophotographic printing plates are formed.
  • the positive-working radiation-sensitive layers are preferred.
  • coated offset printing plates obtained from the carrier materials according to the invention are converted into the desired printing form in a known manner by imagewise exposure or irradiation and washing out of the non-image areas with a developer, preferably an aqueous developer solution.
  • the materials according to the invention are characterized in that, after application of a radiation-sensitive coating, a reproduction material is produced which shows very little under-radiation during the irradiation process in the copying frame and, moreover, good water flow (good water storage capacity and low water requirement, fast) during the printing process with printing forms made from the reproduction material Free running when printing).
  • a variety of the requirements of a practical reproductive material described at the outset can also be met, in particular this applies to the requirements for the interaction of carrier material / radiation-sensitive coating, so that a practical carrier material can also be produced for the highest demands if the parameters according to the invention are observed, which is also continuously possible in modern strip treatment plants.
  • the special advantages also include increased mechanical resistance of the material, which can be demonstrated, for example, by increased print runs.
  • FIG. 2 shows a section through the surface, which is not to scale, from which an approximate size relationship between the holes 3 in the elevations 1 of the superimposed structure and the holes 2 in the basic structure can also be seen.
  • 3 and 4 were prepared in accordance with DE-OS-3 012 135 and show in FIG. 3 the primary structure of the surface with uniform hills 4 and the holes 5 in these hills, the respective bisecting axis of the holes approximately is perpendicular to the base surface of the material, and in Fig. 4 the comparable primary structure of the surface with uniform hills 4 and holes 6, which overlap the primary structure as a secondary structure and whose respective bisecting axis is approximately perpendicular to the tangent to the outer surface of the hill.
  • the mechanically roughened tape is treated for 3 seconds in a 4% aqueous NaOH solution at 70 ° C. in such a way that about 3 g / m 2 are removed from the surface.
  • the electrochemical roughening is also carried out continuously in a 0.9% aqueous HNO 3 solution containing 4% of Al (NO 3 ) 3 at 40 ° C., a residence time of 10 seconds and with an alternating current with a current density of 170 A. / dm 2 carried out.
  • the subsequent anodic oxidation is carried out in 10% aqueous H 3 PO 4 solution at 60 ° C. using direct current until the oxide layer weight is approximately 0.6 g / m 2 .
  • a carrier material produced in this way is cut in the plates and one of these plates is coated with a negative-working radiation-sensitive layer of a polycondensation product, prepared from 1 mol of 3-methoxy-diphenylamine-4-diazonium sulfate and 1 mol of 4,4'-bismethoxymethyl-diphenyl ether in 85% strength H 3 PO 4 and isolated as mesitylene sulfonate coated so that the layer weight after drying is 0.4 g / m 2 .
  • a negative-working radiation-sensitive layer of a polycondensation product prepared from 1 mol of 3-methoxy-diphenylamine-4-diazonium sulfate and 1 mol of 4,4'-bismethoxymethyl-diphenyl ether in 85% strength H 3 PO 4 and isolated as mesitylene sulfonate coated so that the layer weight after drying is 0.4 g / m 2 .
  • Example 1 The procedure of Example 1 is followed, but the mechanical roughening and the alkaline intermediate treatment are omitted.
  • the topography of the surface (“double structure") that can be achieved in Example 1 is not achieved, but rather only an unevenly roughened carrier, penetrated by scars, is obtained. Image reproduction, water flow and print run are considerably worse than in example 1.
  • Example 1 The procedure of Example 1 is followed, but the wire brushing is carried out in such a way that the R a value of the mechanically roughened surface is 0.39 ⁇ m and the tp mi (0.125) value is 37%.
  • this carrier material is roughened more uniformly than in comparative example V1, but does not reach the claimed parameter ranges, in particular not in the R a and tp mi values, and does not yet have a “double structure”. Image reproduction, water flow and print run are a little better than in V1, but still significantly worse than in example 1.
  • the mechanically roughened tape is treated as indicated in Example 1.
  • the electrochemical roughening is carried out in a 1.5% aqueous HN0 3 solution containing 5% Al (N0 3 ) 3 at 30 ° C., a residence time of 15 seconds and with an alternating current with a current density of 100 A / dm 2 carried out.
  • the radiation-sensitive layer to be applied according to Example 1 additionally contains 5.5 parts by weight of a reaction product of a polyvinyl butyral (containing vinyl butyral, vinyl acetate and vinyl alcohol units) and propenylsulfonyl isocyanate. Development takes place in a weakly alkaline aqueous solution with a content of 1% sodium metasilicate, 3% nonionic surfactant and 5% benzyl alcohol. Image reproduction and water flow correspond to that of Example 1, the print run is about 50,000 prints higher.
  • Example 3 The procedure of Example 3 is followed, but the mechanical roughening and the alkaline intermediate treatment are omitted.
  • the topography of the surface (“double structure") that can be achieved in Example 3 is not achieved, but rather only a rather unevenly roughened carrier with several scars is obtained. Image reproduction, water flow and print run are considerably worse than in example 3.
  • Example 3 The procedure of Example 3 is followed, but the wire brushing is carried out such that the R a value of the mechanically roughened surface is 0.40 ⁇ m and the tp mi (0.125) value is 35%.
  • this carrier material is roughened more uniformly than in comparative example V3, but does not reach the claimed parameter ranges, in particular not in the R a and tp mi values, and does not yet have a “double structure”. Image reproduction, water flow and print run are better than in V3, but still significantly worse than in example 3.
  • the carrier material is roughened relatively uniformly, but the surface does not have a “double structure”, ie the parameters which are caused by this special structure are not present or are not in the ranges claimed according to the invention.
  • the printing form After the printing form has been produced, it is found that the water flow and the print run are better than in V4, but have not yet reached Example 3, in particular the practically not improved tendency to under radiation has remained.
  • Example 3 The procedure of Example 3 is followed, but either a matt coating according to DE-OS-2 512 043 is applied to the radiation-sensitive layer or an additive of particles is mixed into the radiation-sensitive layer according to DE-OS-2 926 236.
  • These modifications of the layer should lead to a reduction in the tendency to under radiation (see introduction to the description).
  • the image reproduction of printing forms produced therewith is practically unchanged from those which are produced according to Example 3 without modification of the layer, i. H. when using a "double structure" material according to the invention as a support for offset printing plates, this type of special modification of the radiation-sensitive layer can be dispensed with.
  • the mechanically roughened strip is subjected to an intermediate treatment in a 3% strength aqueous NaOH solution at 50 ° C. for 10 seconds in such a way that about 2.5 g / m 2 are removed from the surface.
  • the electrochemical roughening is also carried out continuously in a 1% aqueous HCl solution containing 2% AlCl 3 . 6 H 2 0 at 40 ° C, a residence time of 20 sec and with alternating current with a current density of 70 A / dm 2 .
  • Anodic oxidation and radiation-sensitive coating are carried out according to the instructions in Example 1. Image reproduction and water flow are rather better than in Example 1, the print run is around 100,000 prints.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Laminated Bodies (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • ing And Chemical Polishing (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Lubricants (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (10)

1. Matériau en forme de plaque, de feuille ou de bande constitué d'aluminium ou de ses alliages, ayant d'un côté ou des deux côtés une surface grainée d'abord par voie mécanique et ensuite par voie électrochimique, caractérisé en ce que:
a) 60 à 90 % de la surface présentent une structure de base dans laquelle la moyenne arithmétique de la distribution des diamètres des trous Da1 est située dans l'intervalle de 1 à 5 µm;
b) 10 à 40 % de la surface présentent une structure superposée consistant en saillies ayant une surface de la base moyenne S de 100 à 1 500 µm2, dans laquelle la moyenne arithmétique de la distribution des diamètres des trous Da2 est située dans l'intervalle de 0,1 à 1,0 µm;
c) les valeurs de la rugosité médiane Ra de la surface totale sont d'au moins 0,6 µm; et
d) le taux de contact tpmi de la surface totale est au maximum d'environ 20 % à une profondeur de coupe de 0,125 µm et au maximum d'environ 70 % à une profondeur de coupe de 0,4 µm.
2. Matériau selon la revendication 1, caractérisé en ce que les paramètres sont:
a) Da1, dans l'intervalle de 2 à 4 µm; b) Da2, dans l'intervalle de 0,3 à 0,8 µm pour une surface de la base moyenne S de 200 à 1 200 µm; c) Ra, dans l'intervalle de 0,8 à 1,2 µm; et d) tpmi (0,125), au maximum d'environ 15 % et tpmi (0,4) au maximum d'environ 60 %.
3. Matériau selon la revendication 1 ou 2, caractérisé en ce que sa surface présente en outre une couche d'oxyde d'aluminium produite par oxydation anodique.
4. Matériau selon la revendication 3, caractérisé en ce que la couche d'oxyde d'aluminium a subi un "post-traitement" hydrophilisant.
5. Procédé de préparation d'un matériau selon l'une des revendications 1 à 4, caractérisé en ce que l'aluminium sous forme de plaque, de feuille ou de bande, éventuellement après un prénettoyage, est grainé mécaniquement d'un côté ou des deux côtés par gratte-brossage et ensuite, éventuellement après un traitement intermédiaire décapant dans une solution aqueuse alcaline ou acide, est grainé par voie électrochimique dans un électrolyte contenant de l'acide chlorhydrique et/ou de l'acide nitrique avec utilisation de courant alternatif.
6. Procédé selon la revendication 5, caractérisé en ce que lorsque l'on effectue le traitement intermédiaire décapant du matériau grainé mécaniquement, on enlève au maximum 5 g/m2.
7. Procédé selon la revendication 5 ou 6, caractérisé en ce qu'après le grainage électrochimique, on effectue en plus un traitement par enlèvement de métal dans une solution aqueuse alcaline ou acide.
8. Procédé selon la revendication 7, caractérisé en ce que lors du "post-traitement" décapant du matériau grainé par voie électrochimique, on enlève au maximum 2 g/m2.
9. Utilisation du matériau selon l'une des revendications 1 à 4 comme matériau support dans la fabrication de plaques d'impression offset portant d'un côté ou des deux côtés une couche sensible aux rayonnements.
10. Utilisation selon la revendication 9, caractérisée en ce que la plaque d'impression offset porte une couche sensible aux rayonnements travaillant en positif.
EP84101145A 1983-02-14 1984-02-04 Plaques, pellicules ou matériel en formes de bandes, en aluminum grainé par voie mécanique et électrochimique, procédé pour leur fabrication, et emploi comme support pour plaques pour l'impression lithographique Expired EP0118740B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84101145T ATE46293T1 (de) 1983-02-14 1984-02-04 Platten-, folien- oder bandfoermiges material aus mechanisch und elektrochemisch aufgerauhtem aluminium, ein verfahren zu seiner herstellung und seine verwendung als traeger fuer offsetdruckplatten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3305067 1983-02-14
DE19833305067 DE3305067A1 (de) 1983-02-14 1983-02-14 Platten-, folien- oder bandfoermiges material aus mechanisch und elektrochemisch aufgerauhtem aluminium, ein verfahren zu seiner herstellung und seine verwendung als traeger fuer offsetdruckplatten

Publications (3)

Publication Number Publication Date
EP0118740A2 EP0118740A2 (fr) 1984-09-19
EP0118740A3 EP0118740A3 (en) 1987-02-04
EP0118740B1 true EP0118740B1 (fr) 1989-09-13

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Family Applications (1)

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EP84101145A Expired EP0118740B1 (fr) 1983-02-14 1984-02-04 Plaques, pellicules ou matériel en formes de bandes, en aluminum grainé par voie mécanique et électrochimique, procédé pour leur fabrication, et emploi comme support pour plaques pour l'impression lithographique

Country Status (11)

Country Link
US (1) US4655136A (fr)
EP (1) EP0118740B1 (fr)
JP (1) JPH0676677B2 (fr)
AT (1) ATE46293T1 (fr)
AU (1) AU573566B2 (fr)
BR (1) BR8400604A (fr)
CA (1) CA1240951A (fr)
DE (2) DE3305067A1 (fr)
ES (1) ES529693A0 (fr)
FI (1) FI82905C (fr)
ZA (1) ZA84821B (fr)

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US4978583A (en) * 1986-12-25 1990-12-18 Kawasaki Steel Corporation Patterned metal plate and production thereof
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Also Published As

Publication number Publication date
FI82905C (fi) 1991-05-10
ATE46293T1 (de) 1989-09-15
JPH0676677B2 (ja) 1994-09-28
ES8504027A1 (es) 1985-04-16
EP0118740A3 (en) 1987-02-04
ZA84821B (en) 1984-09-26
DE3305067A1 (de) 1984-08-16
FI840544A (fi) 1984-08-15
US4655136A (en) 1987-04-07
ES529693A0 (es) 1985-04-16
AU573566B2 (en) 1988-06-16
BR8400604A (pt) 1984-09-18
EP0118740A2 (fr) 1984-09-19
CA1240951A (fr) 1988-08-23
DE3479716D1 (en) 1989-10-19
JPS59182967A (ja) 1984-10-17
AU2426184A (en) 1985-08-22
FI82905B (fi) 1991-01-31
FI840544A0 (fi) 1984-02-10

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