EP1031415B1 - Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique - Google Patents

Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique Download PDF

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Publication number
EP1031415B1
EP1031415B1 EP19990200528 EP99200528A EP1031415B1 EP 1031415 B1 EP1031415 B1 EP 1031415B1 EP 19990200528 EP19990200528 EP 19990200528 EP 99200528 A EP99200528 A EP 99200528A EP 1031415 B1 EP1031415 B1 EP 1031415B1
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EP
European Patent Office
Prior art keywords
compound
printing
press
organic
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
Application number
EP19990200528
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German (de)
English (en)
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EP1031415A1 (fr
Inventor
Joan C/O Agfa-Gevaert N.V. Vermeersch
Luc C/O Agfa-Gevaert N.V. Leenders
Augustin c/o Agfa-Gevaert N.V. Meisters
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
Agfa Gevaert AG
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Publication date
Application filed by Agfa Gevaert NV, Agfa Gevaert AG filed Critical Agfa Gevaert NV
Priority to DE69931459T priority Critical patent/DE69931459T2/de
Priority to EP19990200528 priority patent/EP1031415B1/fr
Priority to US09/501,224 priority patent/US6357353B1/en
Priority to JP2000039390A priority patent/JP2000247053A/ja
Publication of EP1031415A1 publication Critical patent/EP1031415A1/fr
Application granted granted Critical
Publication of EP1031415B1 publication Critical patent/EP1031415B1/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1066—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by spraying with powders, by using a nozzle, e.g. an ink jet system, by fusing a previously coated powder, e.g. with a laser

Definitions

  • the present invention relates to a method for making a heat-mode lithographic printing plate precursor and a lithographic printing master in computer-to-plate and computer-to-press procedures.
  • Rotary printing presses use a so-called master such as a printing plate which is mounted on a cylinder of the printing press.
  • the master carries an image which is defined by the ink accepting areas of the printing surface and a print is obtained by applying ink to said surface and then transferring the ink from the master onto a substrate, which is typically a paper substrate.
  • ink as well as an aqueous fountain solution are fed to the printing surface of the master, which is referred to herein as lithographic surface and consists of oleophilic (or hydrophobic, i.e. ink accepting, water repelling) areas as well as hydrophilic (or oleophobic, i.e. water accepting, ink repelling) areas.
  • Printing masters are generally obtained by the so-called computer-to-film method wherein various pre-press steps such as typeface selection, scanning, colour separation, screening, trapping, layout and imposition are accomplished digitally and each colour selection is transferred to graphic arts film using an image-setter.
  • the film can be used as a mask for the exposure of an imaging material called plate precursor and after plate processing, a printing plate is obtained which can be used as a master.
  • EP-A- 786 337 discloses a process for imaging a printing plate, wherein the printing plate is charged over the whole surface and over the whole surface is covered with toner particles, which are charged oppositely. Thereon is the layer, formed by the particles imagewise fixed or imagewise ablated by infrared exposure on the surface of the printing plate. Thereafter the parts which are not fixed are removed and optionally the non-ablated areas are fixed by heating over the whole surface of the plate. This process requires a cumbersome development.
  • thermal materials disclosed in the prior art are suitable for exposure with either an internal drum image-setter (i.e. typically a high-power short-time exposure) or an external drum image-setter (i.e. relatively low-power long-time exposure).
  • an internal drum image-setter i.e. typically a high-power short-time exposure
  • an external drum image-setter i.e. relatively low-power long-time exposure
  • a method for making a negative working non-ablative imaging material suitable for making a lithographic printing plate, comprising the steps of applying a dry powder containing at least a compound capable of converting light into heat and an organic compound on a surface of a non-electrically charged metal support, characterized in that the amount of organic compound in said powder ranges from 51 to 95% by weight.
  • Said organic compound is present in said powder in an amount of at least 51%.
  • Said organic compound is preferably a thermoplastic polymer particle, more preferably with a diameter between 0.02 ⁇ m and 10 ⁇ m, most preferably between 0.050 ⁇ m and 2 ⁇ m.
  • Preferred thermoplastic polymers are novolac, polystyrene or a polyacrylate, used alone or mixed with one or two of the other components.
  • Preferably said thermoplastic polymer particles contain a reactive compound inside or outside these particles. Particles containing reactive compounds inside the particles are prepared according to the well known technique of preparing microcapsules or by adding the reactive compound in a water immiscible solvent to the particles dispersed in water.
  • Particles containig reactive compounds outside the particles are prepared according to the well known technique of loading latices as described in EP-A- 483 416 .
  • Reactive compounds are compounds which can cause cross-linking.
  • Preferred reactive compounds are melamine resins, urethanes, phenol-formaldehyde resins and epoxy compounds.
  • the compound which is capable of converting light into heat is preferably an organic dye or pigment, carbon black, graphite, metal carbides, borides, nitrides, carbonitrides, or oxides.
  • the materials made by the method of the present invention are preferably sensitive to near infrared light.
  • the compound capable of converting light into heat is preferably a near infrared light absorbing compound such as carbon or an infrared dye. It is also possible to use dry, finely divided polymer particles consisting of e.g. a polypyrrole or polyaniline-based polymer.
  • the infrared dyes listed in Table 1 are highly preferred.
  • the amount of the compound capable of converting light into heat is in the range of 5 to 49% by weight, more preferably between 10 to 49% by weight of the dry powder.
  • the compound capable of converting light into heat can also be incorporated in or adsorbed to or mixed with the polymeric particles or is heterogeneously mixed with said organic compound.
  • the materials made by the method of the present invention require no processing or can be processed with plain water. Since it is a dry coating method, the method of the present invention is very suitable for computer-to-press applications and on-press coating procedures.
  • the imaging mechanism of the materials that are made according to the present invention is not known, but may rely on a thermal interaction between the light absorbing compound and the metal support.
  • image is used herein in the context of lithographic printing, i.e. "a pattern consisting of oleophilic and hydrophilic areas".
  • the material that is made according to the present invention is negative working, which means that the areas, which are exposed to light, are rendered oleophilic and thus ink accepting due to said exposure.
  • the feature "negative working” may be considered as an equivalent of the feature “non-ablative", since in ablative materials the functional layers are completely removed from the underlying (hydrophilic) metal support upon imagewise exposure so as to obtain a positive image (exposed areas are hydrophilic, ink repelling).
  • the dry powder used in the present invention may further comprise non-reactive compounds, i.e. inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent or a filler.
  • inert components such as e.g. a matting agent
  • the method of the present invention may be used to apply a stack of layers on a metal support but a single layer is preferred.
  • the compound capable of converting light into heat may be present in all the layers of said stack or may be localised in just a single layer of said stack.
  • the layer comprising the compound capable of converting light into heat is preferably applied directly on the metal support.
  • the layer comprising the compound capable of converting light into heat is preferably very thin, i.e. having a dry layer thickness below 2 ⁇ m, preferably not higher than 1 ⁇ m.
  • the support used in the present invention is a non-electrically charged metal support.
  • Preferred examples of said metal support are steel, especially polished stainless steel, and aluminium.
  • Phosphor bronze an alloy comprising >90 wt.% of copper, ⁇ 10 wt.% of tin and small amounts of phosphor
  • the aluminium support is preferably an electrochemically grained and anodised aluminium support. Most preferably said aluminium support is grained in nitric acid, yielding imaging elements with a higher sensitivity.
  • the anodised aluminium support may be treated to improve the hydrophilic properties of its surface.
  • the aluminium support may be silicated by treating its surface with sodium silicate solution at elevated temperature, e.g. 95°C.
  • a phosphate treatment may be applied which involves treating the aluminium oxide surface with a phosphate solution that may further contain an inorganic fluoride. Further, the aluminium oxide surface may be rinsed with a citric acid or citrate solution. This treatment may be carried out at room temperature or can be carried out at a slightly elevated temperature of about 30 to 50°C. A further treatment may involve rinsing the aluminium oxide surface with a bicarbonate solution.
  • the aluminium oxide surface may be treated with poly(vinyl phosphonic acid), poly(vinyl methylphosphonic acid), phosphoric acid esters of poly(vinyl alcohol), poly(vinyl sulphonic acid), poly(vinyl benzenesulphonic acid), sulphuric acid esters of poly(vinyl alcohol), and acetals of poly(vinyl alcohols) formed by reaction with a sulphonated aliphatic aldehyde. It is evident that one or more of these post treatments may be carried out alone or in combination.
  • a highly preferred material made according to the present invention comprises a non-electrically charged anodised aluminium support and provided directly thereon a single recording layer which consists essentially of a compound capable of converting light into heat and thermoplastic polymer particles. On top of said recording layer there may be provided a top layer for protecting the recording layer against moisture, chemicals, oxygen, mechanical impact, etc.
  • a non-electrically charged metal support can be applied with a dry powder by rubbing in the surface of said support with said dry powder.
  • Alternative dry coating methods can also be used, e.g. sputter-coating of the powder on the metal support.
  • the method of the present invention can be used in computer-to-plate (off-press exposure) or computer-to-press (on-press exposure) procedures.
  • the method may also involve on-press coating, i.e. applying a dry powder according to the present invention directly on the non-electrically charged metal surface of a cylinder of a rotary printing press.
  • Said on-press coating can also be performed indirectly by applying the dry powder on a metal support which is mounted on a cylinder of a rotary printing press.
  • said composition can be applied on a metal sleeve which, after image-wise exposure and optional processing, is then transferred to a cylinder of a rotary printing press.
  • the dry powder may also be applied on the non-electrically charged metal support by contacting the surface of said support with another material, which carries a dry layer containing an organic compound and a compound capable of transferring light into heat which are then transferred to the metal support.
  • the method of this embodiment can be automated easily, e.g. by incorporating a supply roll of such a transfer material, such as a ribbon impregnated with the dry powder in a print station of a digital press similar to the configuration which is described in EP-A 698 488 .
  • the transfer material can be unwound from said supply roll and the layer containing the dry powder can then be brought in direct contact with the surface of a plate cylinder by one or more contact rollers.
  • the used transfer material may be wound up again on a take-up roll.
  • the transfer of dry power can be carried out so as to obtain a uniform layer which then can be image-wise exposed.
  • said pressure and/or heat can be applied image-wise, so that the dry powder is transferred image-wise to the metal support.
  • This step then may be followed by intense overall heating, e.g. by infrared laser exposure. However, if sufficient heat is applied during said image-wise transfer, a suitable printing master may directly be obtained without intense overall heating.
  • a dry coating unit as described above consisting of a supply roll, one or more contact rollers and a take-up roll, is mounted on the same carriage as the laser exposure unit of an external drum image-setter.
  • a spray coating unit is mounted on the same carriage as the laser exposure unit in an external drum configuration.
  • said dry coating unit moves in front of the laser exposure unit along the so-called slow scan axis, parallel to the axis of the plate cylinder.
  • the whole surface of said cylinder passes the dry coating unit and a layer is coated along a spiral path around the cylinder. Since the laser exposure unit moves together with the dry coating unit, an area which has been coated during one revolution of the cylinder is exposed by the laser exposure unit a number of revolutions later, i.e. coating and image-wise exposing can be carried out almost simultaneously during the same scan procedure.
  • the materials made according to the present invention can be exposed to light by a light omitting diode or an IR-laser such as an He/Ne or Ar laser.
  • a laser emitting near infrared light having a wavelength in the range from about 700 to about 1500 nm is used, e.g. a semiconductor laser diode, a Nd:YAG or a Nd:YLF laser.
  • the required laser power depends on the pixel dwell time of the laser beam, which is determined by the spot diameter (typical value of modern plate-setters at 1/e 2 of maximum intensity : 10-25 ⁇ m), the scan speed and the resolution (i.e.
  • ITD image-setters are typically characterised by very high scan speeds up to 500 m/sec and may require a laser power of several Watts. Satisfactory results have also been obtained by using XTD image-setters having a typical laser power from 100 mW to 500 mW at a lower scan speed, e.g. from 0.1 to 10 m/sec.
  • the materials can even be used as a printing master immediately after image-wise exposure without any additional processing because the unexposed areas are readily removed by the fountain solution or the ink applied during the first runs of the printing job.
  • the printing plate of the present invention can also be used in the printing process as a seamless sleeve printing plate.
  • the printing plate is soldered in a cylindrical form by means of a laser.
  • This cylindrical printing plate which has as diameter the diameter of the print cylinder is slid on the print cylinder instead of mounting a conventional printing plate. More details on sleeves are given in "Grafisch Nieuws" , 15, 1995, page 4 to 6.
  • post-bake i.e. an overall heating treatment after image-wise exposure and optional processing so as to increase the run length of the plate.
  • the materials made according to the present invention allow to achieve satisfactory run lengths without a post-bake.
  • An aluminum support was electrochemically roughened using hydrochloric acid , anodized in sulphuric acid and subsequently treated with polyvinylphosphonic acid.
  • the obtained hydrophilic surface was further used for the application of a dry powder.
  • Dry powders consisting of organic compounds and infrared absorbing compounds were used for rubbing in the above described hydrophilic surface of the electrochemically roughened and anodized aluminum support, using a cotton pad.
  • Powders with various types and ratios of the organic compound and the IR-absorbing compound were prepared and applied by dry rubbing.
  • the carbon black containing powders were prepared by mixing the aqueous carbon black dispersion with an aqueous latex or dispersion of the organic compound in an appropriate ratio and freeze drying the aqueous mixture to remove water from the mixture.
  • the carbon black used in these experiments is Printex L6 TM, a trade name of Degussa and the different organic compounds are described in tabel 2.
  • the IR-dye was included into the latex particle and in composition 7 the IR-dye was absorbed on the latex particle.
  • Table 2 Organic compound (particle size) IR_sensitive compound Required plane image power Ratio organic comp./IR-sensitiv comp.
  • the obtained imaging element was exposed with a 830 nm diode laser (Isomet-3600 dpi (about 1400 dots per cm)-spot size 11 ⁇ m-at a speed of 3.2 m/s; i.e. pixel dwell time of 3.4 ⁇ s-image plane power was varied :80mW-190mW-292mW were used) and printed on a conventional offset printing machine equipped with a conventional ink and fountain solution.
  • a 830 nm diode laser Isomet-3600 dpi (about 1400 dots per cm)-spot size 11 ⁇ m-at a speed of 3.2 m/s; i.e. pixel dwell time of 3.4 ⁇ s-image plane power was varied :80mW-190mW-292mW were used
  • Printing was started without any treatment between imaging and the press start.
  • An aluminum support is electrochemically roughened using hydrochloric acid, anodized in sulphuric acid, and subsequently treated with polyvinylphosphonic acid.
  • the obtained hydrophilic surface was further used for the application of dry powders consisting of polymethylmethacrylate beads of 1 urn and graphite (Graphite NaturalTM trade name of Carbone Lorraine, France- with a particle size ⁇ 20 ⁇ m as an infrared absorbing compound were used for dry rubbing in the above described hydrophilic surface of an electrochemically roughened and anodized aluminum support, using a cotton pad.
  • dry powders consisting of polymethylmethacrylate beads of 1 urn and graphite (Graphite NaturalTM trade name of Carbone Lorraine, France- with a particle size ⁇ 20 ⁇ m as an infrared absorbing compound were used for dry rubbing in the above described hydrophilic surface of an electrochemically roughened and anodized aluminum support, using a cotton pad.
  • the obtained imaging element was exposed with an 830 nm laser diode (Isomet-3600 dpi (about 1400 dots per cm)-spot size 11 ⁇ m-at a speed of 3.2 m/s; i.e.pixel dwell time of 3.4 ⁇ s-Image plane power was varied: 200 mW and 300 mW were used) as well as with a 1060 nm NdYLF laser (Isomet-3600 dpi (about 1400 dots per cm)-spot size 18 ⁇ m-at a speed of 3.2 m/s-image plane power was varied: 585 mW and 780 mW were used) and printed on a conventional offset printing machine equipped with a conventional ink and fountain solution system.
  • 830 nm laser diode (Isomet-3600 dpi (about 1400 dots per cm)-spot size 11 ⁇ m-at a speed of 3.2 m/s; i.e.pixel dwell time of 3.4 ⁇ s-Image plane power was
  • Printing was started without any treatment between imaging and the press start.
  • the ink-uptake measured by Dmax on print 100 (see table 3), proves that the organic compound is needed in an amount of at least 51% to print high densities (>1.55 required); without said amount of polymethylmethacrylate-beads high densities print could not be guaranteed.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (11)

  1. Procédé pour la confection d'une matrice d'impression lithographique comprenant les étapes consistant à :
    - préparer un matériau de formation d'image non ablative à effet négatif en appliquant une poudre sèche, contenant au moins un composé capable de transformer de la lumière en chaleur ainsi qu'un composé organique, sur la surface d'un support métallique exempt de charge électrique, la quantité du composé organique dans ladite poudre variant entre 51 et 95% en poids ;
    - exposer ledit matériau de formation d'images à l'aide d'un laser infrarouge ;
    - éliminer la poudre dans les zones de non-impression en amenant une solution de mouillage et/ou de l'encre au matériau de formation d'image à l'aide d'une presse d'impression.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit composé organique se compose de particules polymères thermoplastiques organiques possédant un diamètre entre 0,02 et 10 µm.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que ledit composé organique se compose de particules polymères thermoplastiques organiques possédant un diamètre entre 0,05 et 2 µm.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que lesdites particules polymères thermoplastiques organiques possèdent un composé réactif à l'intérieur ou à l'extérieur desdites particules.
  5. Procédé selon la revendication 2 ou 3, caractérisé en ce que lesdites particules polymères thermoplastiques organiques se composent de novolaque et/ou de polystyrène et/ou d'un polyacrylate.
  6. Procédé selon les revendications 1 à 5, caractérisé en ce que ledit composé capable de transformer de la lumière en chaleur est un composé absorbant la lumière dans le domaine de l'infrarouge proche.
  7. Procédé selon la revendication 6, caractérisé en ce que ledit composé absorbant la lumière dans le domaine de l'infrarouge proche est un colorant organique ou le carbone.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que ledit composé absorbant la lumière dans le domaine de l'infrarouge proche est mélangé d'une manière hétérogène avec ledit composé organique.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit support métallique est un manchon ou un cylindre d'une presse rotative.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau exposé est monté sur un cylindre d'impression d'une presse rotative entre l'étape (b) et l'étape (c).
  11. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau de formation d'image est monté sur un cylindre d'impression d'une presse rotative entre l'étape (a) et l'étape (b).
EP19990200528 1999-02-23 1999-02-23 Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique Expired - Lifetime EP1031415B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69931459T DE69931459T2 (de) 1999-02-23 1999-02-23 Trockenverfahren zur Herstellung von einer thermischen Flachdruckformen-Vorstufe
EP19990200528 EP1031415B1 (fr) 1999-02-23 1999-02-23 Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique
US09/501,224 US6357353B1 (en) 1999-02-23 2000-02-10 Dry method for preparing a thermal lithographic printing plate precursor
JP2000039390A JP2000247053A (ja) 1999-02-23 2000-02-17 熱平版印刷版前駆体の製造のための乾式法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19990200528 EP1031415B1 (fr) 1999-02-23 1999-02-23 Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique

Publications (2)

Publication Number Publication Date
EP1031415A1 EP1031415A1 (fr) 2000-08-30
EP1031415B1 true EP1031415B1 (fr) 2006-05-24

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EP (1) EP1031415B1 (fr)
JP (1) JP2000247053A (fr)
DE (1) DE69931459T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6740464B2 (en) * 2000-01-14 2004-05-25 Fuji Photo Film Co., Ltd. Lithographic printing plate precursor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA923195A (en) * 1966-12-23 1973-03-20 Rca Corporation Automatic type composition
EP0099264A3 (fr) * 1982-07-09 1985-11-27 Vickers Plc Plaques d'impression
DE19602328A1 (de) * 1996-01-24 1997-07-31 Roland Man Druckmasch Verfahren zum Bebildern einer löschbaren Druckform
US5683848A (en) * 1996-10-02 1997-11-04 Xerox Corporation Acrylonitrile-modified toner composition and processes

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DE69931459T2 (de) 2006-12-07
DE69931459D1 (de) 2006-06-29
EP1031415A1 (fr) 2000-08-30
JP2000247053A (ja) 2000-09-12

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