EP0659119B1 - Planche d'impression et procede de fabrication - Google Patents

Planche d'impression et procede de fabrication Download PDF

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Publication number
EP0659119B1
EP0659119B1 EP94908815A EP94908815A EP0659119B1 EP 0659119 B1 EP0659119 B1 EP 0659119B1 EP 94908815 A EP94908815 A EP 94908815A EP 94908815 A EP94908815 A EP 94908815A EP 0659119 B1 EP0659119 B1 EP 0659119B1
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EP
European Patent Office
Prior art keywords
surface layer
substrate
base material
layer
image
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 - Lifetime
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EP94908815A
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German (de)
English (en)
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EP0659119A1 (fr
Inventor
John Richard Lenney
Robert Michael Organ
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Horsell Graphic Industries Ltd
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Horsell Graphic Industries Ltd
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Filing date
Publication date
Priority claimed from GB929219214A external-priority patent/GB9219214D0/en
Priority claimed from GB9308182A external-priority patent/GB2277383A/en
Application filed by Horsell Graphic Industries Ltd filed Critical Horsell Graphic Industries Ltd
Publication of EP0659119A1 publication Critical patent/EP0659119A1/fr
Application granted granted Critical
Publication of EP0659119B1 publication Critical patent/EP0659119B1/fr
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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
    • B41N3/03—Chemical or electrical pretreatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/006—Printing plates or foils; Materials therefor made entirely of inorganic materials other than natural stone or metals, e.g. ceramics, carbide materials, ferroelectric materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
    • B41N1/083—Printing plates or foils; Materials therefor metallic for lithographic printing made of aluminium or aluminium alloys or having such surface layers

Definitions

  • This invention relates to a light sensitive printing plate and to a method of making a printing plate.
  • Such plates might be used, for example, in lithographic printing processes.
  • Lithographic processes involve establishing image (printing) and non-image (non-printing) areas on a substrate, substantially on a common plane.
  • non-image areas are generally hydrophilic
  • image areas are generally oleophilic. Consequently, oil based inks are repelled from the non-image areas after water has been applied to the substrate.
  • Image and non-image areas can be created by processes which include a step of exposing a layer of image material on the surface of the substrate to radiation. The exposure to radiation creates solubility differences in the image material corresponding to image and non-image areas. Following development, the soluble areas are removed, leaving a pattern on the substrate corresponding to the image.
  • Preparation of the substrate for receiving a layer of the image material must ensure that the material bonds to the substrate, at least prior to image formation. However, it must allow release of the soluble image material after development.
  • Suitable image materials for use in lithographic processes can include those based on diazonium/diazide materials, polymers which undergo depolymerisation or addition photo-polymerisation, and silver halide gelatin assemblies. Examples of suitable materials are disclosed in GB-1592281, GB-A-2031442, GB-A-2069164, GB-A-2080964, GB-A-2109573 and EP-A-377589.
  • Substrates used in the printing industry commonly comprise an aluminium base layer, which has a layer of aluminium oxide on its surface, intermediate the base material and a subsequently applied image layer, resulting from a controlled oxidation reaction conducted electrochemically.
  • a cleaning treatment for example involving washing with alkali.
  • the base layer is then subjected to a texture control treatment, for example involving an etching process, which increases the surface area of the substrate, which in turn controls the strength of the bond between the substrate and the image material and increases the ability of the substrate to hold water.
  • This treatment can involve treatment with water, a solution of a phosphate or silicate salt, or a polycarboxylic acid.
  • GB-1238701 published in 1971, discloses a process according to the pre-characterizing part of claim 1 for preparing a lithographic printing plate in which a surface of a foil such as of aluminium is subjected to a uniform treatment with a plasma arc jet. Finely dispersed silica introduced into the jet causes a layer of silicate to be formed on the surface of the foil.
  • the process disclosed in the document does not appear to have been used commercially to produce plates.
  • Substrates used in lithography can also be formed from materials other than aluminium, such as for example, another metal such as steel, a polymeric material such as a polyester, or a paper based material. Processes used to prepare such substrates for coating with light sensitive material vary widely from that used to prepare an aluminium substrate.
  • the present invention provides a technique for making light sensitive printing plates such as might be used in lithographic processes, in which a surface coating is provided on a substrate by a thermal spraying technique.
  • the invention provides a method of making a light sensitive printing plate for use in lithography, which comprises
  • a plate can be formed in which performance is at least as good in many respects as that provided by traditional manufacturing methods which are used now and have been developed by parties across the lithographic products industry continuously over a period of many years.
  • the technique of the invention has the advantage over traditional methods that the surface layer can be provided, of materials and having a structure which are dependent on the process by which it is applied to the substrate.
  • This can be contrasted with existing processes in which a surface layer is created by modification of the base material of the substrate to create a surface layer with different properties, in which the material and structure of the surface layer of the substrate are dependent on the material and surface of the base material, in addition to the process used to create the surface layer.
  • the invention therefore allows the steps in a process for preparing a substrate, of base material preparation and creation of a surface layer, effectively to be decoupled.
  • thermal spraying technique has the additional advantage over traditional methods of making lithographic printing plates that the number of steps in the manufacturing process can be reduced.
  • the path length i.e. the size of the active process area acting on the web of substrate material is considerably shorter when a thermal spraying technique is used, compared with traditional methods using electrochemical processing techniques. Consequently, the amount of substrate material that is wasted when equipment used to operate the method of the invention is started can be reduced considerably.
  • the reduced number of process steps, or the reduced path length or both can reduce capital outlay, both in terms of manufacturing equipment and of space in which that equipment is operated.
  • a process involving fewer steps is also easier to control to produce products with a consistent quality. It can also be arranged for the process to be operated more quickly than conventional processes.
  • Thermal spraying techniques used for providing the surface layer of a substrate can produce a layer with a topology appropriate for bonding to it of a layer of image material, without separate etching or other texture control steps as are required in known aluminium substrate preparation processes.
  • the topology of the surface of the substrate can be controlled relatively easily by adapting the parameters of the deposition process, giving the process of the invention greater flexibility and control than could be achieved in the conventional processes for producing printing plates.
  • the creation of the surface layer from deposited material, rather than from the base material of the substrate makes less critical the selection of the base material of the substrate.
  • the base material comprises a metal such as one based on aluminium
  • a less pure grade of aluminium can be used than would be required if a surface layer of aluminium oxide were to be formed on the base material by oxidation of the base material.
  • the requirement for thorough cleaning of the base material of a substrate can also be relaxed at least partially, removing or reducing the need for cleaning materials and reducing processing time, and removing or diminishing the problem of disposal of used cleaning materials. In this way, the costs of producing printing plates can be reduced by the method of the present invention.
  • a further advantage of the use of a deposition technique for the manufacture of a plate, at least for certain combinations of substrate base material and coating material (such as an aluminium oxide based coating material deposited on aluminium base material) is that the lightness of the resulting plate can be higher than that of a plate made using the same material for the surface layer but by traditional techniques. This has the advantage that it can increase the contrast between the plate and an image on the plate, which can be important when assessing the image visually and when the image on the plate is to be optically scanned.
  • Suitable dry deposition techniques include thermal spraying and sputtering.
  • An example of thermal spraying techniques which might be applied includes flame spraying. It is particularly preferred that the process uses a plasma spraying technique.
  • the spray When the deposition process employs a plasma spraying technique, it will generally be preferred for the spray to be applied in an atmosphere of an inert gas, for example of hydrogen, nitrogen or argon, or mixtures of these or other gases.
  • the gas is heated in an electric arc to elevated temperature, for example of at least 10 4 °C, generally at least 2 x 10 4 °C. Notwithstanding the energy requirement of the electric arc, it has been found that the power required to operate the deposition process using a gas plasma spraying technique is significantly less than that required to operate the electrochemical technique in the conventional process for producing plates for use in the printing industry.
  • the substrate base material in contact with a heat sink.
  • the deposition technique and the heat sink properties are such that the temperature of the base material does not increase to the extent that the base material becomes annealed.
  • the substrate base material might be maintained in close contact with a block of material with a high thermal mass, such as a relatively large block of a metallic material.
  • the surface layer is formed from particles whose size is less than about 12 ⁇ m, more preferably less than about 8 ⁇ m, especially less than about 5 ⁇ m, for example from about 2 ⁇ m to about 3 ⁇ m.
  • the roughness of the deposited surface layer can be maintained low.
  • the size of the particles is measured using a Coulter counter, calibrated to U S Sedimentometer.
  • the size is the average of the particles across the size distribution, taken as the 50% cumulative point of the distribution curve.
  • a further advantage of plates made using the technique of the present invention is that the resulting plates have a better run length, compared with plates made using traditional techniques with the same surface layer material and comparable image resolution. (Run length is a measure of the number of impressions that can be taken from a plate when in use in printing process.)
  • the surface layer that is formed from the small particles will be generally uniform over the coated area of the base material, as viewed for example under an electron microscope at about 1000x magnification and 45° tilt.
  • the coating material used to form the surface layer will in some situations include particles whose size is bigger than that of the particles from which the surface layer is formed.
  • the coating material might include impurities. It might also include particles which are bigger than the particles of the surface layer, to form regions of local roughness on the substrate base material so that formations are formed on the surface of the image layer.
  • Such particles might be, for example, at least about 1.3 times that of the particles from which the surface layer is formed, preferably at least about 1.8 times that of those particles.
  • the height of the bigger particles above the surface layer might be at least about 3 ⁇ m, preferably at least about 5 ⁇ m, more preferably at least about 7 ⁇ m, especially at least about 10 ⁇ m.
  • the height of the bigger particles above the surface layer might be less than about 40 ⁇ m, preferably less than about 30 ⁇ m, especially less than about 20 ⁇ m.
  • the size of the bigger particles (which will be a diameter in the case of particles with a circular cross-section) is greater than about 5 ⁇ m, more preferably greater than about 7 ⁇ m, especially greater than about 10 ⁇ m.
  • the size is less than about 75 ⁇ m, more preferably less than about 50 ⁇ m, especially less than about 35 ⁇ m.
  • the density of bigger particles on the surface layer can be at least about 50 cm -2 , preferably at least about 10 3 cm -2 , for example at least about 5 x 10 4 cm -2 .
  • the density of particles can be less than about 5 x 10 6 cm -2 , and preferably less than about 10 6 cm -2 for many applications.
  • the deposited surface layer is formed from a material which is capable of exhibiting ceramic-type properties.
  • Desirable properties can include hardness, chemical resistance, and resistance to abrasion. Such properties can arise from rapid solidification of the deposited material on contact with the base material of the substrate.
  • the provision of a surface with ceramic-type properties has the advantage of enabling the substrate prepared from the deposited material to withstand harsh physical conditions during use. Examples of materials capable of forming surface layers on a substrate, with ceramic-type properties include certain silicates, Al 2 O 3 , Cr 2 O 3 , TiO 2 , ZrO 2 , WC and blends of these materials, such as blends of Al 2 O 3 and TiO 2 .
  • Other materials which can be applied to a substrate base material by deposition techniques, to form a substrate for use in lithography include metals such as aluminium, molybdenum, nickel, tantalum, zinc and chromium, alloys such as NiCr and NiCrAlY alloys, steels and bronzes, pseudo-alloys such as CrW and AlMo alloys, polymeric materials such as polyethylene and certain polyesters.
  • the material of bigger particles included in the coating material to provide formations on the surface of the image layer can be the same as the material of the particles from which the surface layer is formed, or different.
  • More than one material might be applied to the base material by deposition, in a single layer or in separate layers provided one on top of another.
  • the base material of the substrate may comprise a metal, which might be a substantially pure elemental metal or an alloy.
  • Suitable metals include, for example, iron based materials such as certain steels, copper and copper based alloys, nickel and cobalt alloys, and aluminium, magnesium and titanium and alloys based on these metals.
  • Non-metallic materials might be used, such as ceramic materials, polymeric materials (such as certain polyesters) and paper based materials.
  • the method of the invention will include appropriate steps to prepare the base material for the creation of the surface by deposition. These might include, for example, cleaning, etching, texturing, anodising, grinding or polishing of the surface.
  • Especially preferred materials for the base material of the substrate include aluminium and aluminium based alloys, certain steels and certain polyesters.
  • the substrate produced by the method will generally be in the form of a sheet.
  • the sheet might be in discrete pieces, or in the form of a continuous web, perhaps provided on a roll.
  • the substrate will generally be produced continuously on a sheet of moving substrate base material, by moving a sheet through production equipment.
  • the sheet has a width measured in a direction perpendicular to the machine direction of at least about 0.2 m, more preferably at least about 0.3 m, especially at least about 0.5 m.
  • the size and shape of particles supplied to the substrate in a thermal spraying process will be selected according to the desired surface topology of the finished coated substrate.
  • the surface roughness R a of the substrate can be measured using a perthometer sold by Perthen under the designation CSD, using a PMK drive unit and a FTK 3/50e mechanical stylus head.
  • the surface roughness is preferably less than about 3.0 ⁇ m, more preferably less than about 1.5 ⁇ m, for example about 0.7 ⁇ m.
  • the surface may be provided with selected regions with a greater roughness, for example as a result of use of bigger particles, for example giving a peak to valley distance on the surface of the substrate greater than about 3 ⁇ m, especially greater than about 5 ⁇ m, perhaps in the range of 10 to 20 ⁇ m, and that any such regions are not to be considered in the context of measuring surface roughness.
  • the thickness of the surface layer which is deposited on the base material will generally be less than about 100 ⁇ m, preferably less than about 40 ⁇ m, more preferably less than about 20 ⁇ m, especially less than about 10 ⁇ m, frequently less than about 5 ⁇ m.
  • the thickness will generally be greater than about 0.1 ⁇ m, preferably greater than about 0.5 ⁇ m, and may be greater than about 10 ⁇ m.
  • the layer of image material provided on the substrate may be provided over the entire surface of the layer of deposited material.
  • the image layer might be exposed to a treatment which makes it relatively easier to remove in selected regions of the substrate than in other regions, in a subsequent removal step.
  • the image material will generally form a bond initially to the surface layer of deposited material, at least in certain regions of the substrate, and will be capable of being modified to alter its susceptibility to a subsequent removal step.
  • suitable developable materials of this kind include those based on diazonium/diazide materials, polymers which undergo depolymerisation or addition photo-polymerisation, and silver halide gelatin assemblies. Examples of suitable materials are disclosed in GB-1592281, GB-A-2031442, GB-A-2069164, GB-A-2080964, GB-A-2109573 and EP-A-377589.
  • Image material may be applied to a substrate in selected regions only, so as to define directly the image and non-image areas of the substrate directly. This might be achieved, for example, using suitably driven fluid jets.
  • the process of the invention can include steps by which the surface of the substrate is treated to change the nature of the interactions between it and a subsequently applied layer of image material.
  • the steps can involve, for example, chemical, physical or electrochemical treatment.
  • the steps might involve treatment with a material, grinding and polishing and so on.
  • the treatment can be physical or chemical (including electrochemical) in nature.
  • the deposited surface layer of material might be treated with water, a polyphosphonic acid, a solution of a phosphate or silicate salt, or with a polycarboxylic acid.
  • a material for treating the surface of the substrate might be applied by a deposition technique.
  • a substrate for use as a lithographic printing plate was made by plasma spraying Al 2 O 3 powder on a 0.3 mm gauge aluminium alloy sheet of designation AA1050.
  • the Al 2 O 3 powder had a particle size of 3 ⁇ m, and was supplied by Abralap Limited under the trade name Abralox C3.
  • An arrangement was used where the sheet was mounted vertically using a steel vacuum plate which also acted as a suitable heat sink. Spraying was carried out using a translational unit which allowed raster scanning of the plasma spraying torch about the plate at a fixed torch-plate distance.
  • the spraying system comprised units supplied by Plasma-Technik, including a control unit designated M1100C, a torch designated F400MB, and a powder feed unit designated Twin 10, which had been modified by introducing a pipe into the unit to allow a further flow of 10 l.min -1 of argon above the powder (in addition to the standard carrier gas flow of 9 l.min -1 of argon associated with the unmodified unit). It was necessary to dehydrate the powder prior to its introduction into the feed unit.
  • the substrate was used to produce a printing plate by (i) treatment with a solution of sodium dihydrogen phosphate, and (ii) bar coating in the laboratory with a light sensitive material of the type which is applied by Horsell Graphic Industries Limited to light sensitive lithographic printing plates sold by them under the trade mark CAPRICORN, at a coating weight of 2 g.m -2 .
  • Substrates for use as printing plates were made by plasma spraying the following range of aluminium alloy sheets with Al 2 O 3 powder having a particle size of 5 ⁇ m, supplied by Abralap Limited under the trade name Abralox C5:
  • the sheets were secured around a 200 mm diameter roller which acted as a heat sink. Spraying was performed by movement of the torch along the axis of the roller, as the roller rotated.
  • the spraying system was the same as that described above in Example 1 (with some variations in the operating conditions), but for the powder feed unit being one without the additional flow of argon gas.
  • Printing plates were made from the substrates by the technique described above in Example 1, and were exposed through an UGRA test pattern. Each of the plates was found to provide satisfactory resolution performance, with no detectable differences between the plates.
  • a substrate was created using the apparatus and method described above in Example 2 (with some variations in the operating parameters of the spraying system), by spraying an AA1050 aluminium alloy sheet with SiO 2 powder having a particle size of 8 ⁇ m, sold by W R Grace Limited under the trade name Syloid Al-1.
  • a printing plate was made from the substrate by the technique described above in Example 1, and was exposed through a UGRA test pattern. The plate was found to provide satisfactory resolution performance.
  • Substrates were created using the apparatus and method described above in Example 1 (with some variations in the operating parameters of the spraying system), by spraying an AA1050 aluminium alloy sheet with Al 2 O 3 powders having a range of particle sizes from 3 to 20 ⁇ m.
  • the substrates were used to produce printing plates as described above in Example 1, which were exposed through UGRA and STOUFFER test patterns, to create a clear 3 on the STOUFFER test pattern following development of the plates.
  • the minimum "intact" positive mircolines on the UGRA test pattern were examined at the clear 3 expose level as a measure of printing plate resolution.
  • Table 1 The results are summarised in Table 1, and compared favourably with the resolution of a plate that is produced by bar coating in the laboratory a conventional electrochemically produced substrate with a CAPRICORN type coating referred to above in Example 1, and which gave a resolution at "clear 3" of 20.
  • the conventional electrochemically produced substrate used for the comparison was the same as is used on commercial production lines of CAPRICORN plates.
  • a substrate was created using the apparatus and method described above in Example 2 (with some variations in the operating parameters of the spraying system), by spraying an AA1050 aluminium alloy sheet with 1:1 mixture by weight of Al 2 O 3 powders having particle sizes of 5 ⁇ m and 9 ⁇ m, sold by Abralap Limited under the trade names Abralox C5 and Abralox C9.
  • a printing plate was made from the substrate by the technique described above in Example 1, and was exposed through a STOUFFER test pattern and a 2% dot screen. Following development to produce a "clear 3", the press performance was compared with that of a plate produced by bar coating in the laboratory of a CAPRICORN type coating as referred to above, exposed and developed to the same level. Run length was assessed by the disappearance of the 2% dot screen. A summary of the results is shown in Table 2. TABLE 2 Test Plasma produced plate Traditional plate Roll-up Comparable performance Clean-up Comparable performance Ink-water balance Comparable performance 2% dot disappearance 270000 impressions 168000 impressions

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

Un procédé de fabrication d'une planche d'impression photosensensible, telle qu'on en utilise en lithographie, consiste à produire sur un matériau de base constituant un substrat, une couche superficielle obtenue par dépôt d'un matériau de revêtement particulaire sur le matériau de base selon une technique de revêtement à sec, la couche superficielle étant composée de particules d'une grosseur inférieure à 15 νm environ; après quoi une couche de formation d'image est formée sur la couche superficielle déposée de sorte que cette dernière est située entre la couche de matériau de base et la couche de formation d'image.

Claims (24)

  1. Procédé de fabrication d'une plaque d'impression sensible à la lumière, qui comprend :
    (a) la création d'une couche de surface sur une matière de base de substrat par dépôt d'une matière de revêtement en particules sur la matière de base en utilisant une technique de pulvérisation thermique ; et
    (b) la création d'une couche d'image sur la couche de surface déposée de sorte que la couche de surface soit située entre la matière de base et la couche d'image ;
    caractérisé en ce que la couche de surface est formée à partir de particules dont la taille est inférieure à environ 15 µm.
  2. Procédé selon la revendication 1, dans lequel la couche de surface est déposée sur la matière de base de substrat au moyen d'un processus de pulvérisation à plasma.
  3. Procédé selon la revendication 1 ou la revendication 2, dans lequel la couche de surface est formée à partir de particules dont la taille est inférieure à environ 12 µm.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel la couche de surface est formée à partir de particules dont la taille est inférieure à environ 8 µm.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel la couche de surface est formée à partir de particules dont la taille est inférieure à environ 5 µm.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel la couche de surface est formée à partir de particules dont la taille est comprise entre 2 µm et 3 µm.
  7. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel la matière de revêtement comprend des particules dont la taille est plus grosse que celle des particules à partir desquelles la couche de surface est formée, pour former des zones de rugosité locale sur la matière de base du substrat, de sorte que des formations soient formées sur la surface de la couche d'image.
  8. Procédé selon la revendication 7, dans lequel la taille desdites particules plus grosses est au moins 1,3 fois celle des particules à partir desquelles la couche de surface est formée.
  9. Procédé selon la revendication 7, dans lequel la taille desdites particules plus grosses est au moins 1,8 fois celle des particules à partir desquelles la couche de surface est formée.
  10. Procédé selon l'une quelconque des revendications 1 à 9, dans lequel le substrat est sous la forme d'une feuille.
  11. Procédé selon la revendication 10, qui est mis en oeuvre de manière continue sur une bande de matière de base de substrat mobile, la largeur de la bande, mesurée dans une direction perpendiculaire par rapport à la direction d'avance de la machine, étant d'au moins 0,2 m.
  12. Procédé selon l'une quelconque des revendications 1 à 11, dans lequel la matière de base de substrat est constituée par une matière métallique.
  13. Procédé selon la revendication 12, dans lequel la matière métallique est constituée par de l'aluminium.
  14. Procédé selon l'une quelconque des revendications 1 à 13, dans lequel la matière de la couche de surface est constituée par une matière qui est capable de présenter les propriétés d'une céramique.
  15. Procédé selon la revendication 14, dans lequel la matière de la couche de surface est constituée par du Al2O3.
  16. Procédé selon l'une quelconque des revendications 1 à 15, qui comprend l'étape de traitement de la surface de la matière de la couche de surface avant l'application de la couche d'image, pour modifier ses caractéristiques de liaison ou de mouillage, ou les deux, par rapport à la couche d'image.
  17. Plaque d'impression sensible à la lumière qui comprend :
    a) un substrat qui comprend une couche de surface formée par dépôt d'une matière de revêtement de particules sur une matière de base en utilisant une technique de pulvérisation thermique ; et
    b) une couche de matière d'image sur la surface de la couche déposée, sur laquelle des zones avec image et sans image peuvent être crées lors de l'exposition sélective de la plaque à la lumière ;
    caractérisée en ce que la couche de surface est formée à partir de particules dont la taille est inférieure à environ 15 µm.
  18. Plaque d'impression selon la revendication 17, dans laquelle la matière de revêtement comprend des particules dont la taille est plus grosse que celle des particules qui composent la couche de surface, lesquelles forment des zones de rugosité locale sur la matière de base de substrat, de sorte que des formations soient formées sur la surface de la couche d'image.
  19. Plaque d'impression selon la revendication 17 ou la revendication 18, dans laquelle le substrat se présente sous la forme d'une bande.
  20. Plaque d'impression selon la revendication 19, dont la dimension transversale la plus courte est au moins égale à 0,2 m.
  21. Plaque d'impression selon l'une quelconque des revendications 17 à 20, dans laquelle le substrat comprend une matière de base qui est constituée par une matière métallique.
  22. Plaque d'impression selon la revendication 21, dans laquelle la matière métallique est constituée par de l'aluminium.
  23. Plaque d'impression selon l'une quelconque des revendications 17 à 21, dans laquelle la couche de surface déposée est formée à partir d'une matière qui est capable de présenter les propriétés d'une céramique.
  24. Plaque d'impression selon la revendication 23, dans laquelle ladite couche de surface déposée est constituée par du Al2O3.
EP94908815A 1992-09-10 1993-09-09 Planche d'impression et procede de fabrication Expired - Lifetime EP0659119B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9219214 1992-09-10
GB929219214A GB9219214D0 (en) 1992-09-10 1992-09-10 Lithographic substrate preparation
GB9308182 1993-04-21
GB9308182A GB2277383A (en) 1993-04-21 1993-04-21 A light sensitive printing plate
PCT/GB1993/001910 WO1994005507A1 (fr) 1992-09-10 1993-09-09 Planche d'impression

Publications (2)

Publication Number Publication Date
EP0659119A1 EP0659119A1 (fr) 1995-06-28
EP0659119B1 true EP0659119B1 (fr) 1997-03-12

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EP94908815A Expired - Lifetime EP0659119B1 (fr) 1992-09-10 1993-09-09 Planche d'impression et procede de fabrication

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EP (1) EP0659119B1 (fr)
JP (1) JPH08501505A (fr)
AU (1) AU4977693A (fr)
BR (1) BR9307032A (fr)
DE (1) DE69308861T2 (fr)
DK (1) DK0659119T3 (fr)
ES (1) ES2102209T3 (fr)
WO (1) WO1994005507A1 (fr)

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US5881645A (en) * 1992-09-10 1999-03-16 Lenney; John Richard Method of thermally spraying a lithographic substrate with a particulate material
AU6573294A (en) * 1993-09-09 1995-03-27 Horsell Graphic Industries Ltd A light sensitive printing plate
JPH10504605A (ja) * 1994-08-18 1998-05-06 ホーセル・グラフィック・インダストリーズ・リミテッド 印刷版の製造における、およびこれに関連する改良
DE4432814A1 (de) * 1994-09-15 1996-03-28 Roland Man Druckmasch Trägerhülse für Druck- und Übertragungsformen
US6779449B1 (en) 1994-09-15 2004-08-24 Man Roland Druckmaschinen Ag Carrying sleeve for printing and transfer forms and a process for production of such a carrying sleeve
DE19610015C2 (de) * 1996-03-14 1999-12-02 Hoechst Ag Thermisches Auftragsverfahren für dünne keramische Schichten und Vorrichtung zum Auftragen
DE59602394D1 (de) * 1995-03-17 1999-08-12 Hoechst Ag Thermisches auftragsverfahren für dünne keramische schichten und vorrichtung zum auftragen
US5711991A (en) * 1995-11-20 1998-01-27 Aluminum Company Of America Process for making lithographic sheet material having a thermoplastic adhesive layer
EP0862518B2 (fr) * 1995-11-24 2006-05-17 Kodak Polychrome Graphics Company Ltd. Support hydrophylise pour plaques d'impression planographique et sa preparation
US5795647A (en) * 1996-09-11 1998-08-18 Aluminum Company Of America Printing plate having improved wear resistance
GB9624224D0 (en) 1996-11-21 1997-01-08 Horsell Graphic Ind Ltd Planographic printing
GB9702568D0 (en) * 1997-02-07 1997-03-26 Horsell Graphic Ind Ltd Planographic printing
GB9710552D0 (en) 1997-05-23 1997-07-16 Horsell Graphic Ind Ltd Planographic printing
US6357351B1 (en) 1997-05-23 2002-03-19 Kodak Polychrome Graphics Llc Substrate for planographic printing
DE19839454A1 (de) 1998-08-29 2000-03-02 Agfa Gevaert Ag Aufzeichnungsmaterial aus einem Träger und einer auf einer Oberfläche des Trägers aufgebrachten Keramikschicht
US6293197B1 (en) 1999-08-17 2001-09-25 Kodak Polychrome Graphics Hydrophilized substrate for planographic printing
DE102004051262A1 (de) * 2004-10-21 2006-04-27 Man Roland Druckmaschinen Ag Offsetdruckmaschine

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US2032770A (en) * 1934-01-26 1936-03-03 Multigraph Co Planographic printing plate
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CH208963A (de) * 1938-01-11 1940-03-15 Walther Georg Verfahren zur Herstellung von Druckplatten für den Hoch-, Tief- und Flachdruck.
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US4526839A (en) * 1984-03-01 1985-07-02 Surface Science Corp. Process for thermally spraying porous metal coatings on substrates

Also Published As

Publication number Publication date
WO1994005507A1 (fr) 1994-03-17
EP0659119A1 (fr) 1995-06-28
ES2102209T3 (es) 1997-07-16
BR9307032A (pt) 1999-06-29
JPH08501505A (ja) 1996-02-20
DK0659119T3 (da) 1997-07-28
DE69308861T2 (de) 1997-10-02
DE69308861D1 (de) 1997-04-17
AU4977693A (en) 1994-03-29

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