EP0974455B1 - Trockenes Verfahren zur Herstellung eines thermischen lithographischen Druckplatten Precursors - Google Patents

Trockenes Verfahren zur Herstellung eines thermischen lithographischen Druckplatten Precursors Download PDF

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Publication number
EP0974455B1
EP0974455B1 EP19990202010 EP99202010A EP0974455B1 EP 0974455 B1 EP0974455 B1 EP 0974455B1 EP 19990202010 EP19990202010 EP 19990202010 EP 99202010 A EP99202010 A EP 99202010A EP 0974455 B1 EP0974455 B1 EP 0974455B1
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EP
European Patent Office
Prior art keywords
dry powder
light absorbing
absorbing compound
layer
previous
Prior art date
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Expired - Lifetime
Application number
EP19990202010
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English (en)
French (fr)
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EP0974455A1 (de
Inventor
Luc Leenders
August Meisters
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Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
Agfa Gevaert AG
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Priority to EP19990202010 priority Critical patent/EP0974455B1/de
Publication of EP0974455A1 publication Critical patent/EP0974455A1/de
Application granted granted Critical
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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
    • 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

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 describes a method wherein dry powder, especially toner, is applied to a support.
  • the dry powder is then molten image-wise and removed at non-exposed areas by a mechanical or electrostatic processing device.
  • the latter step is necessary because the exposure does not convert the powder from a hydrophilic to an oleophilic state (or vice-versa) but only changes the adherence of the powder to the support by-melting said powder.
  • a processing device is difficult to implement in a printing press.
  • 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
  • an imaging material which is suitable for making a lithographic printing master, may be obtained by applying on a metal support a dry powder which contains a light absorbing compound in an amount not less than 50% by weight relative to the dry powder and which is preferably substantially free from other reactive compounds besides the light absorbing compound.
  • the materials made by the method of the present invention require no processing or can be processed by applying plain water, ink or fountain. 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. Another major benefit of the materials made according to the present invention is the excellent stability : they can be stored during 2 minutes at 100°C without toning (accepting ink in non-exposed areas), contrary to conventional thermal lithographic printing plate precursors which show significant toning when exposed to the above conditions. Some materials made according to the present invention, especially those comprising carbon as a light absorbing compound, can even be stored during 2 minutes at 150°C without noticeable toning.
  • the imaging mechanism of the materials that are made according to the present invention is not known, but may rely on a heat-induced interaction between the light absorbing compound and the metal support.
  • the aluminium signal measured by secondary ion mass spectroscopy while sputtering away the upper 2 nm from the surface of a material, consisting of an anodised aluminium support and a layer consisting exclusively of a light absorbing compound drops upon image-wise exposure down to 50% or even 10% of the signal measured at unexposed areas, the specific value being highly dependent on the structure of the light absorbing compound used.
  • image is used herein in the context of lithographic printing, i.e. a pattern consisting of oleophilic (printing) and hydrophilic (non-printing) 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 image-wise exposure so as to obtain a positive image (exposed areas are hydrophilic, ink repelling).
  • exposed areas are hydrophilic, ink repelling.
  • Analysis of the exposed areas of the material made according to the method of the present invention indeed showed that the layer or stack of layers is not or only partially removed upon image-wise exposure but, instead, is converted into a hydrophobic surface on the metal support.
  • the unexposed areas are hydrophilic or become hydrophilic after processing with plain water, ink or fountain.
  • the exposed areas are oleophilic and form the printing areas of the printing master.
  • the light absorbing compound is the main compound of the dry powder.
  • the feature "main compound” designates that the compound is present in an amount not less than 50% by weight relative to all the compounds in the dry powder. This feature distinguishes the present invention from prior art methods as described in EP-A 786 337 using toner as a dry powder, since it is well known to the skilled person that toner particles comprise a low amount of light absorbing compound, which is typically about 5% by weight.
  • the amount of light absorbing compound is not less than 70% by weight and even more preferably not less than 90% by weight relative to all the compounds in the dry powder.
  • the dry powder consists essentially of a light absorbing compound.
  • Mixtures of light absorbing compounds can also be used, and then, the total amount of all light absorbing compounds relative to all the compounds in the dry powder is not less than 50% by weight, more preferably not less than 70% by weight and even more preferably not less than 90 % by weight.
  • the dry powder may comprise other compounds in addition to the light absorbing compound, the amount of other reactive compounds besides the light absorbing compound is preferably less than 20% by weight relative to the dry powder.
  • the feature "reactive compound” shall be understood as a compound which undergoes a (physico-)chemical reaction due to the heat generated during image-wise exposure. Examples of such reactive compounds are thermoplastic polymer latex, diazo resins, naphtoquinone diazide, photopolymers, resole and novolac resins, or modified poly(vinyl butyral) binders. More examples can be found in J. Prakt. Chem. Vol. 336 (1994), p. 377-389.
  • the amount of said other reactive compounds in the dry powder is less than 10% by weight and most preferably, the dry powder is substantially free from reactive compounds other than the light absorbing compound.
  • the words "substantially free” shall be understood as meaning that a small ineffective amount of such reactive compounds may be present in addition to the light absorbing compound. Said small ineffective amount is not essential for or does not significantly contribute to the imaging process of the material made according to the present invention. This can be tested easily by preparing a material without said small amount of reactive compounds and establishing whether the material thus obtained can still be used to make a printing master.
  • the treshold value below which the amount of the other reactive compounds, besides the light absorbing compound, may be regarded as "ineffective” depends on the nature of the reactive compounds.
  • the dry powder used in the present invention may further comprise non-reactive compounds, i.e. inert components such as e.g. a binder, a matting agent or a filler.
  • inert components such as e.g. a binder, a matting agent or a filler.
  • inert components such as e.g. a binder, a matting agent or a filler.
  • inert components i.e. a binder, a matting agent or a filler.
  • inert components such as e.g. a binder, a matting agent or a filler.
  • inert components such as e.g. a binder, a matting agent or a filler.
  • inert components such as e.g. a binder, a matting agent or a filler.
  • inert components such as e.g. a binder, a matting agent or a filler.
  • hydrophilic binders e.g. carboxymethyl cellulose, homopolymers and copolymers of vinyl pyrrolidone, vinyl alcohol, acrylamide, methylol acrylamide, methylol methacrylamide, acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate or maleic anhydride/vinylmethylether copolymers.
  • the amount of hydrophilic binder in the layer applied on the metal support is preferably less than 40% by weight and more preferably between 5 and 20% by weight.
  • 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 light absorbing compound 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 light absorbing compound is preferably applied directly on the metal support.
  • the layer comprising the light absorbing compound is preferably very thin, i.e. having a dry layer thickness not higher than 1 ⁇ m, preferably not higher than 0.5 ⁇ m and even more preferably ranging from 0.1 to 0.25 ⁇ m. A layer thickness below 0.1 ⁇ m may still give satisfactory results.
  • an anodised aluminium support provided with a 0.1 ⁇ m layer consisting of finely divided carbon particles, which was then cleaned by wiping thoroughly with a dry cloth and image-wise exposed with an infrared laser, still provides an excellent printing master.
  • the latter example shows that it may be sufficient to fill the pores present in an anodised aluminium support with light absorbing powder in order to obtain a material having the benefits of the present invention.
  • the support used in the present invention is a 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 an anodised aluminium support and provided directly thereon a single recording layer which consists essentially of a light absorbing compound and is substantially free from other reactive compounds. 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.
  • the light absorbing compound used in the present invention is a compound which is capable of converting light into heat.
  • Useful compounds are for example organic dyes, 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 light absorbing compound 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 dry powder consists of or comprises soot as a light absorbing compound, i.e. the black carbon obtained from the incomplete combustion of organic materials such as oils, wood, natural gas, acetylene, coal, wax or cork.
  • soot may even be applied to the metal support by contacting a surface of said support with a flame obtained by burning said organic material.
  • the surface of the metal support is contacted with the colder part of the flame where combustion is incomplete, e.g. the yellow end of the flame of a candle. Electron microscopic images of materials made in this way show a uniform coating of submicron soot particles.
  • a metal support can be applied with a dry powder by rubbing in the surface of said support with a light absorbing compound, e.g. carbon or an organic dye.
  • a light absorbing compound e.g. carbon or an organic dye.
  • Alternative dry coating methods can also be used, e.g. sputter-coating of carbon on the metal support or direct electrostatic printing (toner jet).
  • the latter technique can be used to apply the dry powder image-wise on a metal support and after intense overall heating, e.g. by infrared laser exposure, a printing master is obtained.
  • Said infrared laser can be mounted on the same carriage as the direct electrostatic printing head.
  • 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 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 metal support by contacting the surface of said support with another material, which carries a dry layer containing a light absorbing compound which is 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 light absorbing compound, in a print station of a digital press similar to the configuration which is described EP-A 698 488.
  • the transfer material can be unwound from said supply roll and the layer containing the light absorbing compound 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 light absorbing compound 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 emitting diode or a laser such as a 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 unexposed areas of the material made according to the present invention can be removed easily by applying plain water, ink or fountain to the material.
  • This step may be performed on-press, i.e. after mounting the exposed plate on the plate cylinder of a printing press.
  • 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. It is evident that the step of processing the material can be omitted when the layer of dry powder is a non-contiguous layer, obtained by applying said powder image-wise as described above. In the latter method, no powder is present in non-image areas and as a result, the processing step may be omitted.
  • 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.
  • anodised aluminium support was covered with a soot layer by contacting said surface with the flame of a Bunsen burner fed with natural gas. After coating the whole support, the layer was rubbed off with a dry cloth so as to obtain a uniform thin layer of soot.
  • the plate precursor thus obtained was image-wise exposed with a Nd:YLF (1060 nm) external drum (XTD) laser having a power of 738 mW and a scan speed of 8.0 m/sec.
  • the plate was mounted on the cylinder of an AB Dick 360 (trade name) printing press and cleaned with a sponge that was moistened with plain water.
  • a print job of 25000 copies was started using Rubber Base Plus VS2329 Universal Black ink, trade name of Van Son, and Tame EC 7035 fountain, trade name of Anchor, the latter diluted with water 50-fold. The print quality was very good throughout the press run.
  • a suitable printing master was obtained by image-wise exposing the above layer with the following alternative laser sources :
  • Three plate precursors were prepared by rubbing in the surface of an anodised aluminium plate with a dry powder consisting of Cpd 1, Cpd 4 or Cpd 9 respectively.
  • the samples were image-wise exposed with an XTD Nd:YLF laser (1060 nm) with a power of 150 mW at a scan speed of 2 m/sec.
  • the plates thus obtained were used as a master in a print job using the same press, ink and fountain as in Example 1.
  • No special measures were taken to ensure that the layer had a uniform thickness over the whole surface of the plate and it was observed that the plates were completely hydrophobic at the centre, where the coating thickness was the highest, regardless whether the plate had been exposed at that area or not.
  • a good printing quality was obtained with no toning in the non-exposed areas, indicating the a low layer thickness is preferred for these light absorbing compounds.
  • Cpd 2, Cpd 3, Cpd 10 and Cpd 11 were each rubbed in as a dry powder on the surface of an anodised aluminium plate.
  • the four materials thus obtained were image-wise exposed with a XTD laser diode (830 nm) with a power of 60 or 80 mW and a scan speed of 1, 2 or 4 m/sec (six combinations exposed at different areas of each plate).
  • the plates were used as a master in a print job using the same press, ink and fountain as in Example 1. All masters provided good printing results over the whole area of the plate.

Claims (15)

  1. Ein durch die nachstehenden Schritte gekennzeichnetes Verfahren zur Herstellung einer lithografischen Druckvorlage mit druckenden und nicht-druckenden Bereichen :
    Herstellung eines nicht-ablativen Bilderzeugungsmaterials durch Beschichtung eines Metallträgers mit einer Schicht aus trockenem Pulver,
    Erwärmung oder Belichtung des trockenen Pulvers in den druckenden Bereichen,
    gegebenenfalls Entfernung des trockenen Pulvers von den nicht-druckenden Bereichen des Metallträgers durch Auftrag von Wasser, Druckfarbe oder Feuchtwasser,
    dadurch gekennzeichnet, daß das trockene Pulver zumindest
    50 Gew.-% einer lichtabsorbierenden Verbindung enthält.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das trockene Pulver zumindest 70 Gew.-% einer lichtabsorbierenden Verbindung enthält.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das trockene Pulver zumindest 90 Gew.-% einer lichtabsorbierenden Verbindung enthält.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das trockene Pulver als Hauptbestandteil eine lichtabsorbierende Verbindung enthält.
  5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Menge anderer reaktiver Verbindungen im trockenen Pulver, außer der lichtabsorbierenden Verbindung, weniger als 20 Gew.-% beträgt.
  6. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das trockene Pulver im wesentlichen frei von anderen reaktiven Verbindungen, außer der lichtabsorbierenden Verbindung, ist.
  7. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die lichtabsorbierende Verbindung eine nahes Infrarotlicht absorbierende Verbindung ist.
  8. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die lichtabsorbierende Verbindung Kohlenstoff oder Ruß ist.
  9. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Schritt der Beschichtung eines Metallträgers mit einer Schicht aus trockenem Pulver durch Inkontaktbringen des Trägers mit einer Flamme erfolgt.
  10. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Schritt der Beschichtung eines Metallträgers mit einer Schicht aus trockenem Pulver dadurch erfolgt, daß der Träger mit einem Übertragungsmaterial mit einer eine lichtabsorbierende Verbindung enthaltenden Schicht in Kontakt gebracht wird.
  11. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Schicht aus trockenem Pulver eine nichtbenachbarte, bildmäßig auf den Metallträger angebrachte Schicht ist.
  12. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Metallträger eine eloxierte Aluminiumplatte ist.
  13. Verfahren nach Anspruch 12, dadurch gekennzeichnet, daß die eloxierte Aluminiumplatte auf eine Trommel einer Rotationsdruckpresse aufgespannt wird.
  14. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Metallträger eine Hülse einer Trommel einer Rotationsdruckpresse ist.
  15. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Stärke der Schicht aus trockenem Pulver nicht mehr als 1 µm beträgt.
EP19990202010 1998-07-16 1999-06-23 Trockenes Verfahren zur Herstellung eines thermischen lithographischen Druckplatten Precursors Expired - Lifetime EP0974455B1 (de)

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EP19990202010 EP0974455B1 (de) 1998-07-16 1999-06-23 Trockenes Verfahren zur Herstellung eines thermischen lithographischen Druckplatten Precursors

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Application Number Priority Date Filing Date Title
EP98202381 1998-07-16
EP98202381 1998-07-16
EP19990202010 EP0974455B1 (de) 1998-07-16 1999-06-23 Trockenes Verfahren zur Herstellung eines thermischen lithographischen Druckplatten Precursors

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EP0974455B1 true EP0974455B1 (de) 2003-09-03

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0972637B1 (de) * 1998-07-16 2003-11-12 Agfa-Gevaert Lagerstabiler Vorläufer für eine thermische Flachdruckplatte
DE19947225A1 (de) * 1999-10-01 2001-04-12 Koenig & Bauer Ag Verfahren zur Behandlung von Druckplatten in Druckmaschinen
US6551757B1 (en) 2001-05-24 2003-04-22 Eastman Kodak Company Negative-working thermal imaging member and methods of imaging and printing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099264A3 (de) * 1982-07-09 1985-11-27 Vickers Plc Druckplatten
JPS60184888A (ja) * 1984-03-05 1985-09-20 Daicel Chem Ind Ltd レ−ザ−記録用フイルム
DE3713801A1 (de) * 1987-04-24 1988-11-10 Forschungsgesellschaft Fuer Dr Druckform-material fuer den flachdruck
US5129321A (en) * 1991-07-08 1992-07-14 Rockwell International Corporation Direct-to-press imaging system for use in lithographic printing
DE19602328A1 (de) * 1996-01-24 1997-07-31 Roland Man Druckmasch Verfahren zum Bebildern einer löschbaren Druckform

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