WO1998055330A1 - Precurseur de planche d'impression thermosensible - Google Patents

Precurseur de planche d'impression thermosensible Download PDF

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Publication number
WO1998055330A1
WO1998055330A1 PCT/EP1998/003476 EP9803476W WO9855330A1 WO 1998055330 A1 WO1998055330 A1 WO 1998055330A1 EP 9803476 W EP9803476 W EP 9803476W WO 9855330 A1 WO9855330 A1 WO 9855330A1
Authority
WO
WIPO (PCT)
Prior art keywords
printing plate
lithographic printing
plate precursor
silver
developer
Prior art date
Application number
PCT/EP1998/003476
Other languages
English (en)
Inventor
John Michael Kitteridge
Philip John Watkiss
Original Assignee
Agfa-Gevaert Naamloze Vennootschap
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agfa-Gevaert Naamloze Vennootschap filed Critical Agfa-Gevaert Naamloze Vennootschap
Priority to JP50158699A priority Critical patent/JP2002508852A/ja
Priority to EP98932143A priority patent/EP0986485A1/fr
Publication of WO1998055330A1 publication Critical patent/WO1998055330A1/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B41C1/1033—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials by laser or spark ablation

Definitions

  • This invention relates to the formation of images directly from electronically composed digital sources and is particularly concerned with the formation of images on lithographic printing plate precursors. More particularly, the invention relates to lithographic printing plate precursors which incorporate an imaging layer comprising metallic silver, and a method of preparing lithographic printing plates which does not require the use of chemical treatments.
  • Lithographic printing is a process of printing from surfaces which have been prepared in such a way that certain areas are capable of accepting ink (oleophilic areas), whereas other areas will not accept ink (oleophobic areas).
  • the oleophilic areas form the printing areas while the oleophobic areas form the background areas.
  • Plates for use in lithographic printing processes may be prepared using a photographic material that is made imagewise receptive or repellent to ink upon photo-exposure of the photographic material and subsequent chemical treatment.
  • this method of preparation which is based on photographic processing techniques, involves several steps, and therefore requires a considerable amount of time, effort and expense.
  • Imaging systems are also available which involve a sandwich structure which, on exposure to a heat generating infra-red laser beam, undergoes selective (imagewise) delamination and subsequent transfer of materials.
  • peel-apart systems are generally used as replacements for silver halide films.
  • a digital imaging technique has been described in US Patent No 4911075 whereby a so-called driographic plate which does not require dampening with an aqueous fountain solution to wet the non-image areas during printing is produced by means of a spark discharge.
  • a plate precursor comprising an ink-repellent coating containing electrically conductive particles coated on a conductive substrate is used and the coating is ablatively removed from the substrate.
  • the ablative spark discharge provides images having relatively poor resolution.
  • Coatings which may be imaged by means of ablation with infra-red radiation have previously been proposed.
  • a proofing film in which an image is formed by imagewise ablation of a coloured layer on to a receiver sheet is described in PCT Application No 90/12342.
  • This system is, however, disadvantageous in requiring a physical transfer of material in the imaging step, and such methods tend to give rise to inferior image resolution.
  • a driographic printing plate precursor is imaged digitally by means of an infra-red diode laser or a YAG laser, and the image is formed directly through the elimination of unwanted material.
  • the technique involves exposing a plate precursor, incorporating an infra-red radiation ablatable coating covered with a transparent cover sheet, by directing the beam from an infrared laser at sequential areas of the coating so that the coating ablates and loses its ink repellancy in those areas to form an image, removing the cover sheet and ablation products, and inking the image.
  • a heat mode recording material is disclosed in US Patent No 4034183 which comprises an anodised aluminium support coated with a hydrophilic layer. On imagewise exposure using a laser, the exposed areas are rendered hydrophobic, and thereby accept ink.
  • Japanese patent application laid open to public inspection No 49-117102 (1974) discloses a method for producing printing plates wherein a metal is incorporated in the imaging layer of a printing plate precursor which is imaged by irradiation with a laser beam modulated by electric signals.
  • the plate precursor comprises a metal base, such as aluminium, coated with a resin film, which is typically nitrocellulose, and on top of which has been provided a thin layer of copper. The resin and metal layers are removed in the laser-struck areas, thereby producing a printing plate.
  • a printing plate precursor comprising a support, typically aluminium, an anodic aluminium oxide layer, and a layer of brass, silver, graphite or, preferably, copper is exposed to a laser beam of high energy density in order to render the exposed areas hydrophilic to yield a printing plate.
  • the printing plate precursor is, however, of rather low sensitivity and requires the use of a high energy laser for exposure.
  • An alternative heat mode recording material for making a lithographic printing plate is disclosed in European Patent No 609941, which comprises a support having a hydrophilic surface, or provided with a hydrophilic layer, on which is coated a metallic layer, on top of which is a hydrophobic layer having a thickness of less than 50nm.
  • a lithographic printing plate may be produced from the said material by imagewise exposing to actinic radiation, thereby rendering the exposed areas hydrophilic and repellent to greasy ink.
  • European Patent No 628409 discloses a heat mode recording material for making a lithographic printing plate which comprises a support and a metallic layer, on top of which is provided a hydrophilic layer having a thickness of less than 50nm.
  • a lithographic printing plate is produced by imagewise exposing the material to actinic radiation in order to render the exposed areas hydrophobic and receptive to greasy ink.
  • difficulties in printing will be encountered.
  • the energy is converted to heat in the image areas by interaction with the metallic layer, thereby destroying the hydrophilicity or hydrophobicity - depending on the material employed - of the topmost layer in those areas.
  • the surface of the metallic layer becomes exposed, and the success of the printing operation is dependent upon differences in hydrophilicity and oleophilicity between the metallic surface and the hydrophilic or hydrophobic layer, as the case may be. Since the metallic layer functions as the hydrophobic surface in one case, and as the hydrophilic surface in the alternative case, it would be expected that such differences in hydrophilicity and oleophilicity would not be sufficiently clearly defined so as to provide a satisfactory printing surface. Furthermore, when a hydrophilic layer is present, and the metallic surface functions as the oleophilic areas of the plate, image areas will necessarily be printed from the metallic surface; such an arrangement is known to be unsatisfactory, and to result in difficulties in achieving acceptable printing quality.
  • the metallic layer is silver and it is an additional object of the invention to provide a lithographic printing plate precursor which shows improved sensitivity when exposed to a high intensity laser beam and which, following exposure, produces a lithographic printing plate showing enhanced durability during printing operations.
  • a silver halide emulsion layer is transformed, by treatment with a so-called silver halide solvent, into soluble silver complex compounds which are then allowed to diffuse into an image receiving layer and are reduced therein by means of a developing agent, generally in the presence of physical development nuclei, to form a metallic silver layer.
  • the present inventors have observed that the optical reflective densities and absorptivities of the silver depositions produce by this method play a critical role in determining the amount of energy required to cause the deposited silver to become activated and subsequently ablated from a hydrophilic substrate surface. Furthermore, the inventors have observed that these optical properties are highly dependent on the composition of the developing agent which, therefore, has a significant effect upon the sensitivity of the silver layer. Specifically, it has been found that optimum sensitivity is achieved when the developer system has an alkaline pH value in excess of 10. In addition, the inventors have also found that lithographic printing plate precursors including metallic silver layers produced in this way also provide printing plates showing good clean-up properties in background areas and enhanced durability on press.
  • a lithographic printing plate precursor comprising: (i) a grained and anodised aluminium substrate, having coated thereon
  • the substrate employed in the present invention is an aluminium substrate which has been electrochemically grained and anodised on at least one surface in order to enhance its lithographic properties.
  • the aluminium may be laminated to other materials, such as paper or various plastics materials, in order to enhance its flexibility, whilst retaining the good dimensional stability associated with aluminium.
  • the metallic silver layer deposited by means of a silver salt diffusion transfer process, has a thickness in the range of from 20 nm to 200 run, most preferably from 40 nm to lOO n-m.
  • Two suitable diffusion transfer processes are available: a two sheet system in which a silver halide emulsion layer is provided on one element and a physical development nuclei layer is provided on a second element, the two elements being placed in contact in the presence of developing agent(s) and silver halide solvent(s) in the presence of an alkaline processing liquid, and subsequently peeled apart to provide a metallic silver layer on the second element; and a single sheet system wherein the element is provided with a physical development nuclei layer, a silver halide emulsion layer is provided on top thereof, the element is treated with developing agent(s) and silver halide solvent(s) in the presence of an alkaline processing liquid and the element is washed to remove spent emulsion layer and leave a metallic silver layer which is formed in the layer containing physical development nuclei.
  • the diffusion transfer process may be used to apply a metallic silver layer by overall exposure of a positive working silver halide emulsion layer to form a latent negative image which is then developed in contact with a physical development nuclei layer to form a metallic silver layer.
  • the process may be carried out using either a single sheet or a double sheet system.
  • the developer system has a pH in excess of 10, preferably between 10.5 and 13, most preferably between 11.0 and 12.5. Adjustment of the pH into the appropriate range is most conveniently achieved by the addition of an alkaline solution, such as aqueous sodium hydroxide, as appropriate. Corrective adjustments to reduce the pH, where necessary, are typically made by the addition of a relatively weak acid, such as glacial acetic acid.
  • a relatively weak acid such as glacial acetic acid.
  • a typical developer composition could also include an antioxidant (preferably 5 - 15% by weight), for example sodium sulphite; a silver halide developing agent (preferably 1 - 3% by weight), such as hydroquinone or ascorbic acid; an auxiliary developing agent (preferably 0.5 - 1% by weight, such as l-phenyl-3-pyrazolidone; a silver halide solvent (preferably 0.5 - 2% by weight), for example, sodium thiosulphate or sodium thiocyanate; a development accelerator (preferably 1 - 4% by weight), such as 2-methylaminoethanol; a corrosion inhibitor (preferably 2 - 5% by weight), for example, glycerol; a sequestrant (preferably 0.5 - 2% by weight), such as ethylenediaminetetraacetic acid; and a surfactant (preferably 0.01 - 0.5% by weight), typically a non-ionic or anionic surfactant.
  • an antioxidant preferably 5 - 15% by weight
  • a silver halide developing agent
  • a method of preparing a lithographic printing plate comprising
  • the precursor is imaged by a beam of radiation, preferably from a laser operating in the infra-red region of the spectrum.
  • a beam of radiation preferably from a laser operating in the infra-red region of the spectrum.
  • suitable infra-red lasers include semiconductor lasers and YAG lasers, for example the Gerber Crescent 42T Platesetter with a 10 W YAG laser outputting at 1064 nm. Exposure to the beam of radiation causes ablation of the metallic layer to occur in the radiation-struck areas.
  • the plate precursors according to the first aspect of the invention show increased sensitivity on exposure.
  • the plates prepared on exposure give good clean-up on press, allowing for efficient start-up of printing operations and giving copies free from background scumming. Additionally, long print runs may be achieved.
  • the plate may be prepared for printing operations, prior to or following exposure, by treatment with a composition comprising a proteolytic enzyme, a silver oleophilising agent and a desensitising compound.
  • a composition comprising a proteolytic enzyme, a silver oleophilising agent and a desensitising compound.
  • Suitable enzymes for use in the above composition may include, for example, trypsin, pepsin, ficin, papain or the bacterial proteases or proteinases.
  • Oleophilising compounds may be chosen from those disclosed on pages 105 to 106 of "Photographic Silver Halide Diffusion Processes" by Andre Rott and Edith Weyde, but mercapto compounds and cationic surfactants, such as quaternary ammonium compounds, are of particular value.
  • Carbohydrates such as gum arabic, dextrin and inorganic polyphosphates such as sodium hexametaphosphate provide useful desensitising compounds in these compositions.
  • the compositions comprise aqueous solutions containing from 0.1 % to 10.0% by weight of enzyme, from 0.05% to 5.0%> by weight of oleophilising compound and from 1.0% to 10.0% by weight of desensitising compound.
  • the printing plate precursor and the method of the present invention provide press ready plates showing high image quality and clean background, good press properties and high durability on press without the requirement for the use of costly intermediate film and developer chemistry and the attendant materials.
  • a sheet of aluminium metal was degreased in a 5% w/w aqueous solution of sodium hydroxide before being electrochemically grained with an alternating electric current in a mixture of acetic and hydrochloric acids according to the method disclosed in British Patent No 1598701, then cleaned with a 10% aqueous solution of phosphoric acid and finally anodised with a direct electric current in sulphuric acid.
  • the sheet was then rinsed with water to remove residual acid, and a Carey Lea colloidal dispersion of silver was applied to the grained and anodised surface to give a coating weight of 1 mg/m 2 of silver, and this was then further coated with a gelatino-silver chlorobromide dispersion to give a coating weight of 4 g/m 2 and a silver coating weight of 1.6 g/m 2 .
  • a series of eight diffusion transfer developers having a range of pH values in the region of 10 to 13.5, was prepared.
  • Each developer comprised an aqueous solution containing 11% w/w sodium sulphite, 2% w/w hydroquinone, 0.6% w/w Phenidone (l-phenyl-3-pyrazolidone), 1% w/w sodium thiosulphate and 3% w/w 2- methylaminoethanol.
  • pH adjustments were effected by the addition of aqueous sodium hydroxide and/or acetic acid.
  • the resulting assemblies of physically developed silver on a grained and anodised aluminium substrate were loaded onto a Gerber Crescent 42T internal drum Laser Platesetter fitted with an extraction system comprising a curved nozzle about 1cm from the plate surface, an air suction pump and a 0.3 ⁇ m HEPA filter for removal of ablation debris and imagewise exposed to a 10W YAG laser outputting at a wavelength of 1064 nm to ablatively remove the silver in background areas and thereby create an image.
  • each printing plate was treated with an aqueous solution comprising a proteolytic enzyme, an oleophilising agent and a desensitising gum prior to mounting on a printing press.
  • This treatment was designed to ensure a good start up to printing operations with image areas showing high oleophilicity with good ink acceptance, and background non-image areas being clean and free from ink adhesion.
  • the press was run to produce 20,000 good copies before being stopped with the plates fully inked. After a stopdown lasting 18 hours, the press was restarted and further copies were printed.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

L'invention concerne un précurseur de planche d'impression lithographique comportant un substrat en aluminium granuleux et anodisé enrobé d'une couche d'argent métallique qui est déposée au moyen d'un procédé de reproduction par transfert de sel d'argent dans lequel le révélateur présente un pH d'au moins 10. L'exposition, conforme à une image, du précurseur se fait au moyen d'un faisceau laser de forte intensité et permet d'obtenir directement des planches prêtes pour l'impression grâce auxquelles la qualité d'image est élevée. Ces planches présentent un fond propre, de bonnes propriétés d'impression et une grande solidité au cours de l'impression et ce, sans qu'il soit nécessaire d'avoir recours à un film intermédiaire et à la technique du révélateur. Ces précurseurs de planches présentent une sensibilité accrue à l'exposition. Après cette opération, l'élimination de la couche métallique se produit dans les zones exposées.
PCT/EP1998/003476 1997-06-03 1998-06-02 Precurseur de planche d'impression thermosensible WO1998055330A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP50158699A JP2002508852A (ja) 1997-06-03 1998-06-02 感熱印刷板前駆体
EP98932143A EP0986485A1 (fr) 1997-06-03 1998-06-02 Precurseur de planche d'impression thermosensible

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9711388.0 1997-06-03
GBGB9711388.0A GB9711388D0 (en) 1997-06-03 1997-06-03 Heat sensitive printing plate precursors

Publications (1)

Publication Number Publication Date
WO1998055330A1 true WO1998055330A1 (fr) 1998-12-10

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EP (1) EP0986485A1 (fr)
JP (1) JP2002508852A (fr)
GB (2) GB9711388D0 (fr)
WO (1) WO1998055330A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6544719B2 (en) * 2001-06-26 2003-04-08 Agfa-Gevaert Method of making a heat-mode lithographic printing plate precursor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001264990A1 (en) * 2000-05-30 2001-12-11 Richard J. D'amato Methods of preparing positive-working lithographic printing plates
EP1225039A1 (fr) * 2001-01-23 2002-07-24 Agfa-Gevaert Précurseurs de plaques d'impression thermosensibles

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL57602C (fr) * 1942-10-02 1900-01-01
FR358075A (fr) * 1905-07-24 1906-01-26 Jullien Et Dessolle Soc Feuilles métalliques électrolytiques pour remplacer la pierre dans l'impression lithographique et leur mode d'emploi
GB716402A (en) * 1952-09-05 1954-10-06 Algraphy Ltd Improvements in or relating to lithographic printing plates
JPS5237104A (en) * 1975-09-16 1977-03-22 Fuji Photo Film Co Ltd Printing plate material and method of making plate using same
US4278758A (en) * 1979-07-06 1981-07-14 Drexler Technology Corporation Process for making a reflective data storage medium
US4278756A (en) * 1979-07-06 1981-07-14 Drexler Technology Corporation Reflective data storage medium made by silver diffusion transfer
EP0131462A2 (fr) * 1983-07-11 1985-01-16 E.I. du Pont de Nemours and Company Plaques pour l'impression lithographique
JPS6072792A (ja) * 1983-09-29 1985-04-24 Fuji Photo Film Co Ltd 平版印刷版用支持体
EP0609941A2 (fr) * 1993-02-05 1994-08-10 Agfa-Gevaert N.V. Matériau d'enregistrement thermosensible et procédé pour la production de plaques lithographiques
EP0628409A1 (fr) * 1993-06-11 1994-12-14 Agfa-Gevaert N.V. Procédé pour l'enregistrement par la chaleur et procédé pour la fabrication de plaques d'impression utilisant ce procédé
DE19748711A1 (de) * 1996-11-05 1998-05-07 Mitsubishi Paper Mills Ltd Verfahren zur Herstellung einer Lithographiedruckplatte

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06180506A (ja) * 1992-12-11 1994-06-28 Fuji Photo Film Co Ltd 平版印刷材料の処理方法および現像液
EP0716935B1 (fr) * 1994-12-14 1998-07-01 Agfa-Gevaert N.V. Procédé pour la préparation d'une feuille d'aluminium utilisée comme support pour une plaque d'impression lithographique

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR358075A (fr) * 1905-07-24 1906-01-26 Jullien Et Dessolle Soc Feuilles métalliques électrolytiques pour remplacer la pierre dans l'impression lithographique et leur mode d'emploi
NL57602C (fr) * 1942-10-02 1900-01-01
GB716402A (en) * 1952-09-05 1954-10-06 Algraphy Ltd Improvements in or relating to lithographic printing plates
JPS5237104A (en) * 1975-09-16 1977-03-22 Fuji Photo Film Co Ltd Printing plate material and method of making plate using same
US4278758A (en) * 1979-07-06 1981-07-14 Drexler Technology Corporation Process for making a reflective data storage medium
US4278756A (en) * 1979-07-06 1981-07-14 Drexler Technology Corporation Reflective data storage medium made by silver diffusion transfer
EP0131462A2 (fr) * 1983-07-11 1985-01-16 E.I. du Pont de Nemours and Company Plaques pour l'impression lithographique
JPS6072792A (ja) * 1983-09-29 1985-04-24 Fuji Photo Film Co Ltd 平版印刷版用支持体
EP0609941A2 (fr) * 1993-02-05 1994-08-10 Agfa-Gevaert N.V. Matériau d'enregistrement thermosensible et procédé pour la production de plaques lithographiques
EP0628409A1 (fr) * 1993-06-11 1994-12-14 Agfa-Gevaert N.V. Procédé pour l'enregistrement par la chaleur et procédé pour la fabrication de plaques d'impression utilisant ce procédé
DE19748711A1 (de) * 1996-11-05 1998-05-07 Mitsubishi Paper Mills Ltd Verfahren zur Herstellung einer Lithographiedruckplatte

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7718, Derwent World Patents Index; Class A97, AN 77-31738Y, XP002080050 *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 213 (M - 408) 30 August 1985 (1985-08-30) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6544719B2 (en) * 2001-06-26 2003-04-08 Agfa-Gevaert Method of making a heat-mode lithographic printing plate precursor

Also Published As

Publication number Publication date
GB9711388D0 (en) 1997-07-30
EP0986485A1 (fr) 2000-03-22
GB9811830D0 (en) 1998-07-29
JP2002508852A (ja) 2002-03-19
GB2325887A (en) 1998-12-09

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