EP1486348A2 - Substrat aus Aluminium-Legierung für lithographische Druckplatten und Verfahren zu seiner Herstellung - Google Patents

Substrat aus Aluminium-Legierung für lithographische Druckplatten und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP1486348A2
EP1486348A2 EP04076742A EP04076742A EP1486348A2 EP 1486348 A2 EP1486348 A2 EP 1486348A2 EP 04076742 A EP04076742 A EP 04076742A EP 04076742 A EP04076742 A EP 04076742A EP 1486348 A2 EP1486348 A2 EP 1486348A2
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European Patent Office
Prior art keywords
aluminium
printing plate
weight
support
plate
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EP04076742A
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English (en)
French (fr)
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EP1486348A3 (de
EP1486348B1 (de
Inventor
Ronaldus J. T. H. Wiegers
Sipke Jan Koopmans
Toshiyuki Sekiya
Yuzo Toda
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Fujifilm Manufacturing Europe BV
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Fujifilm Manufacturing Europe BV
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Priority claimed from EP03076834A external-priority patent/EP1486347A1/de
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Priority to EP04076742A priority Critical patent/EP1486348B1/de
Publication of EP1486348A2 publication Critical patent/EP1486348A2/de
Publication of EP1486348A3 publication Critical patent/EP1486348A3/de
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    • 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
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/003—Aluminium alloys
    • 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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/32—Alkaline compositions
    • C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C25F1/02—Pickling; Descaling
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/04—Etching of light metals

Definitions

  • the present invention relates to a planographic printing plate and more particularly relates to a planographic printing plate in which the support is made using continuous casting.
  • Conventional aluminium alloy substrates for a support for a lithographic printing plate are generally provided in the form of a 0.1 to 0.5 mm thick cold-rolled sheet made of an aluminium alloy such as JIS A1050, A1100, A3003, or the like.
  • Such aluminium alloy cold-rolled sheets are generally produced by machining the surface of a semi continuous-cast (DC) slab or billet, homogenization heat-treating the billet when necessary, heating the billet to a selected temperature, hot-rolling the heated billet to a hot-rolled strip, cold-rolling the hot-rolled strip with an intermediate annealing between the cold rolling passes when necessary, and final cold rolling the strip to a cold-rolled sheet.
  • the aforementioned conventional process using a DC slab or billet has drawbacks in that the process steps are complicated and take much time, the production cost is high, the casting speed is slow, the rolling and heat treatment conditions are strict, and heat treatments must be carried out many times, and the process cannot provide an aluminium alloy support with stable properties.
  • Japanese Unexamined Patent Publication (Kokai) Nos. 3-79798 and 5-156414 disclosed a process of producing an aluminium alloy support for a lithographic printing plate, in which an aluminium alloy melt is continuously cast and rolled to form a strip, which is subjected to cold rolling, heat treatment, and straightening.
  • the invention furthermore relates to a planographic printing plate by casting molten aluminium directly and continuously into a thin aluminium plate, wherein the side that is the top side during the casting process is used for the manufacturing of the printing plate.
  • directly and continuously casting has to be understood as at least encompassing various methods in which aluminium or aluminium alloy or similar suitable material is molten and then transferred to suitable equipment for forming thin sheet-like material in a continuous process.
  • aluminium has to be understood as including aluminium alloys.
  • the invention further relates to a method for producing said printing plates..
  • the invention also relates to the use of said planographic printing plates, in a printing process..
  • Heat/photo sensitive printing plate an aluminium plate provided with a heat and/or a photo-sensitive layer.
  • Planographic printing plate an exposed(heat/photo) printing plate ready for usage in a printing process.
  • a method for continuously cast rolling a tabular plate directly from molten aluminium alloy there can be used a method employing a cooling belt such as Hazelett method or a method employing a cooling roller such as Hunter method and 3C method. Since the Hazelett method continuously casts a thick plate, a hot rolling is subsequently conducted to make the thickness reelable. On the other hand, since the Hunter method or the 3C method makes it possible to directly cast a plate having the thickness of 10 mm or lower, a hot rolling machine is not necessary.
  • JP-A-60-238001, JP-A-60-240360, etc. disclose a method for preparing a coil of thin sheet. Among those a twin roller continuous casting method such as the Hunter method is preferable. Preferably a substantially horizontal casting method is used.
  • the molten aluminium alloy is rapidly cooled by the continuous casting.
  • the reference number 1 is a melt holding furnace in which an aluminium ingot is melted and retained.
  • the molten aluminium is then fed to a twin-roller continuous casting machine 2, then wound on coiler 3.
  • a continuous casting method using a cooling belt and a hot rolling may be applied as shown in Fig. 1(B).
  • the coil wound on coiler 3 is cold rolled to a thin plate of 0.3 to 3.0 mm using cold rolling machine 4.
  • an intermediate annealing may be conducted using heating machine 5 when necessary.
  • heating (annealing) machine 5 there are various types such as a batch type, a continuous annealing type, an induced heating type.
  • the temperature is elevated at a rate of 0.5 °C/sec or more and the preferred temperature is 300 °C or more. More preferably annealing can be applied at 480°C or more.
  • the resulting thin plate is rolled again to a thickness of 0.1 to 0.5 mm using a cold rolling machine.
  • correction is conducted using correcting machine 6.
  • the correction may be conducted together with a finishing rolling.
  • the aluminium support thus obtained is subjected to a graining treatment.
  • an aluminium alloy support for a printing plate is electrolytically grained, it is a common practice to carry out as a pre-treatment chemical etching with an acid or alkali for degreasing or removal of oxide films from the surface of the substrate.
  • the electrolytic graining process is an electrolytic etching process wherein an alternating current is applied where as a counter electrode graphite or the like is used to cause electrolytic etching, thereby forming pits on the surface of the substrate to provide a grained surface.
  • the above graining enhances the adhesion of a photosensitive film and improves the water retention, beneficial to printing performance, to the printing plate. Since adhesion and water retention should be provided uniformly over the whole surface of the printing plate, pits should be formed uniformly over the whole printing plate. For a printing plate provided with a photosensitive film, the grained surface should have a uniform appearance when viewed with the naked eye because the results of development after the exposure and development are evaluated by visual inspection.
  • Nonuniform appearance of the grained surface means nonuniform color tone such as observation of streaks (a streak pattern) along the rolling direction or partial loss of gloss to give a cloudy appearance. This is caused by nonuniform chemical etching as a pre-treatment, leaving at least one region unetched or excessive etching, and electrolytic etching as an electrolytic graining treatment and a nonuniform metallic structure.
  • nonuniform metallic structure is attributable to nonuniform aluminium crystals orientation and aluminium crystal size, coarsening and nonuniform dispersion of an intermetallic compound, and the like. Even when the nonuniformity of the metallic structure is of an extent that is not detrimental to the uniformity of electrolytic graining (including pre-treatment) necessary for printing, it often makes the appearance of the grained surface remarkably nonuniform.
  • a nonuniform appearance, i.e., the presence of cloudy color shading, in the grained surface is very inconvenient to inspection of image areas after development.
  • the cloudy portions are present as they are in nonimage portions after development, and since they have a color tone similar to the image areas, it becomes difficult to visually judge whether or not the image areas can be satisfactorily developed.
  • ripple mark defect a wave like pattern.
  • the ripple marks become visible after a sequence of surface treatments and can only clearly be observed when the final product is almost completed.
  • the present inventors discovered that the marks can be made visible by simply etching the surface of the support by alkaline.
  • Aqueous solutions of sodium or potassium hydroxide are the most preferable alkali solutions and the concentration is between 5 to 40 %.
  • Etching operation can be done by simply dipping a sample in an alkali bath. Temperature is between 15 to 35 °C, dipping time is between 1 to 10 minutes, depending on alloy, thickness, casting conditions, etc..
  • the alkali etching method the more suitable surface for planographic printing plate can be determined. This method is in principle independent from the continuous cast method used. It can be applied to the supports obtained via any of the above mentioned continuous cast methods and even for such methods as described in for example US4523627 or WO9832559.
  • the side to be used for graining, hydrophilizing, coating, matting, etc. in order to form a good quality lithographic printing plate for supports manufactured via basically horizontal continuous casting methods was found to be the side that is the top side during the casting process.
  • the present inventors discovered that usage of the side that was the bottom side during the casting as surface for subsequent graining, hydrophilizing, coating, matting, etc. runs a risk of providing a non-uniform surface, in the form of ripple marks.
  • the top side during casting is much less prone to ripple mark formation, whereas the bottom side during casting quite often shows ripple marks.
  • Usage of the top side drastically improves lot to lot fluctuation of casting in terms of ripple mark formation.
  • the temperature in melt holding furnace 1 needs to be kept at not lower than the melting point of aluminium.
  • the temperature in the melt holding furnace varies depending on the components of aluminium alloy. In general, it is not lower than 800 °C.
  • the molten aluminium alloy is subjected to a proper treatment such as inert gas purge and fluxing.
  • a preferable constitutional range of an alloy component is as follows.
  • the preferable Fe content in the alloy is between 0.15 and 0.50 weight %, more preferably between 0.20 and 0.35 weight %.
  • the preferable Si content is between 0.05 and 0.20 weight %, more preferably between 0.10 and 0.15 weight %.
  • Si content is less than 0.05 weight %, response to electrical graining becomes weak.
  • Si content is more than 0.20 weight %, toning characteristic of the printing plate becomes worse.
  • the preferable Cu content is between 0.005 and 0.040 weight %, more preferably between 0.008 and 0.025 weight %.
  • Cu content is less than 0.005 weight %, response to electrical graining becomes weak.
  • Cu content is more than 0.040 weight %, resulting electrical graining structure becomes too coarse leading the printing plate having worse toning characteristic.
  • the method for graining the support for planographic printing plate according to the present invention there is used mechanical graining, chemical graining, electrochemical graining or combination thereof.
  • Examples of mechanical graining methods include ball graining, wire graining, brush graining, and liquid honing.
  • electrochemical graining method there is normally used AC electrolytic etching method.
  • electric current there is used a normal alternating current such as sine waveform or a special alternating current such as square waveform, and the like.
  • etching may be conducted with caustic soda.
  • electrochemical graining it is preferably conducted with an alternating current in an aqueous solution mainly composed of hydrochloric acid or nitric acid.
  • aqueous solution mainly composed of hydrochloric acid or nitric acid.
  • the aluminium support is etched with alkali.
  • alkaline agents include caustic soda, caustic potash, sodium metasilicate, sodium carbonate, sodium aluminate, sodium gluconate, etc.
  • concentration of the alkaline agent, the temperature of the alkaline agent and the etching time are preferably selected from 0.01 to 25%, 20 to 90 °C and 5 sec. to 5 min., respectively.
  • the preferred etching rate is in the range of 0.1 to 15 g/m 2 .
  • the etching rate is preferably in the range of 0.01 to 1 g/m 2 (JP-A-1-237197). Since alkaline-insoluble substances (smut) are left on the surface of the aluminium plate thus alkali-etched, the aluminium plate may be subsequently desmutted as necessary.
  • the aluminium plate is subsequently subjected to AC electrolytic etching in an electrolyte mainly composed of hydrochloric acid or nitric acid.
  • the frequency of the AC electrolytic current is in the range of 0.1 to 100 Hz, preferably 0.1 to 1.0 Hz or 10 to 60 Hz.
  • the concentration of the etching solution is in the range of 3 to 150 g/l, preferably 5 to 50 g/l.
  • the Content of aluminium in the etching bath is preferably in the range of not more than 50 g/l, more preferably 2 to 20 g/l.
  • the etching bath may contain additives as necessary. However, in mass production, it is difficult to control the concentration of such an etching bath.
  • the electric current density in the etching bath is preferably in the range of 5 to 100 A/dm 2 , more preferably 10 to 80 A/dm 2 .
  • the waveform of electric current can be properly selected depending on the required quality and components of aluminium support used but may be preferably the special alternating waveform described in U.S. Patent No. 4,087,341 (corresponding to JP-B-56-19280) and JP-B-55-19191. (The term "JP-B" as used herein means an "examined Japanese patent publication").
  • the waveform of electric current and the liquid conditions are properly selected depending on required electricity as well as required quality and components of aluminium support used.
  • the aluminium plate which has been subjected to electrolytic graining is then subjected to dipping in an alkaline solution as a part of desmutting treatment to dissolve smutts away.
  • an alkaline agent there may be used caustic soda or the like.
  • the desmutting treatment is preferably effected at a pH value of not lower than 10 and a temperature of 25 to 60°C for a dipping time as extremely short as 1 to 10 seconds.
  • the aluminium plate thus etched is then dipped in a solution mainly composed of sulphuric acid.
  • the sulphuric acid solution is in the concentration range of 50 to 400 g/l, and the temperature range of 20 to 70 °C. If the concentration of sulphuric acid is more than 400 g/l or the temperature of sulphuric acid is more than 70 °C, the processing bath is more liable to corrosion. Further, if the aluminium plate is etched by more than 0.4 g/m 2 , the printing durability may be reduced. Thus, the etching rate is preferably controlled to not more than 0.4 g/m 2 , more preferably not more than 0.2 g/m 2 .
  • an anodized film is formed in an amount of 0.1 to 10 g/m2, more preferably 0.3 to 5 g/m 2 .
  • the anodizing conditions vary with the electrolyte used and thus are not specifically determined. In general, it is appropriate that the electrolyte concentration is in the range of 1 to 80% by weight, the electrolyte temperature is in the range of 5 to 70 °C, the electric current density is in the range of 0.5 to 60 A/dm 2 , the voltage is in the range of 1 to 100 V, and the electrolysis time is in the range of 1 second to 5 minutes.
  • the grained aluminium plate having an anodized film thus obtained is stable and excellent in hydrophilicity itself and thus can directly form a heat- or photosensitive coat thereon. If necessary, the aluminium plate may be further subjected to a surface treatment.
  • a silicate layer formed by the foregoing metasilicate of alkaline metal or an undercoating layer formed by a hydrophilic polymeric compound may be formed on the aluminium plate.
  • an undercoating layer Before applying the main coating layer, an undercoating layer may be applied.
  • the coating amount of the undercoating layer is preferably in the range of 5 to 150 mg/m 2 .
  • a heat- and/or photosensitive coating is then formed on the aluminium plate thus treated, imagewise exposed to light, and then developed, to make a printing plate, which is then mounted in a printing machine for printing.
  • an aluminium strip (alloy AA1050) having a thickness of 5.0 mm was formed and coiled.
  • the strip was cold rolled to a thickness of 2.2 mm, then annealed at 520°C for 8 hours, and further cold rolled to form an aluminium support of a thickness of 0.278 mm.
  • the aluminium support was subjected to alkali etching.
  • the material was dipped in an aqueous solution of 25 weight % sodium hydroxide at 21°C for 7 minutes, rinsed by running water, and dried.
  • the top surface at the casting did not reveal any ripple formation.
  • the top surface at the casting of the aluminium support was brush grained, etched with a 25% aqueous solution of sodium hydroxide at 50°C such that etched amount was 5 g/m2, after washing the etched plate with water, the plate was immersed in an aqueous sulphuric acid of 180 g/l at 50°C for 20 seconds to desmut the plate, and the plate was washed with water.
  • the support was electrochemically grained in 9 g/l of an aqueous nitric acid solution using the alternating (wave form ) electric current described in Japanese Patent No. JP-B-55-19191).
  • An anode surface oxide coating of 2.5 g/m2 was formed on the support in a 20% sulphuric acid, and then dried. Furthermore a silicate layer was formed on the surface by dipping in an 2.5 wt% aqueous sodium metasilicate solution at 25°C.
  • the thus obtained aluminium plate was examined for non-uniform parts: the plate appeared uniform in graining quality and appearance. No non-uniformity was observed.
  • the photosensitive planographic printing plate thus-prepared was subjected to exposure for 50 seconds with a metal halide lamp of 3 kW from a distance of 1 m. through a transparent negative film, and then it was subjected to development with a developing solution of the following composition, followed by gumming in gum arabic, whereby the planographic printing plates were prepared.
  • Developing solution Chemical g/l Sodium sulphite 5.0 Benzyl alcohol 30 Sodium carbonate 5.0 Sodium isopropylnaphthalenesulfonate 12.0 Purified water to make 1 lt
  • a printing test was carried out in a usual procedure using the planographic printing plate thus-prepared: 200.000 copies could be printed with a good quality.
  • an aluminium strip (alloy AA1050) having a thickness of 5.0 mm was formed and coiled.
  • the strip was cold rolled to a thickness of 2.2 mm, then annealed at 520°C for 8 hours, and further cold rolled to form an aluminium support with a thickness of 0.278 mm.
  • the aluminium support as such was subjected to alkali etching.
  • the support was dipped in an aqueous solution of 25 weight % sodium hydroxide at 21°C for 7 minutes, rinsed by running water, and dried.
  • the bottom surface at the casting revealed severe ripple formation.
  • Example 2 the side that was the bottom side during the casting process was submitted to the same steps as in Example 1. Upon examination, the plate shows an severe wave-like pattern, which renders the substrate unsuitable for further usage as a substrate for a lithographic printing plate.
  • an aluminium strip (alloy AA1050) having a thickness of 5.0 mm was formed and coiled.
  • the strip was cold rolled to a thickness of 2.2 mm, then annealed at 380°C for 4 hours, and further cold rolled to form an aluminium support with a thickness of 0.278 mm.
  • a similar test was repeated 10 times.
  • the top surface at the casting of the test material was brush grained, etched with a 25% aqueous solution of sodium hydroxide at 50°C such that etched amount was 5 g/m2, after washing the etched plate with water, the plate was immersed in an aqueous sulphuric acid of 180 g/l at 50°C for 20 seconds to desmut the plate, and the plate was washed with water.
  • the support was electrochemically grained in 9 g/l of an aqueous nitric acid solution using the alternating ( wave form ) electric current in the manner as described in example 1.
  • the quantity of electricity in the anode time became 180 coulomb/dm2.
  • An anode surface oxide coating of 3.5 g/m2 was formed on the support in a 20% sulphuric acid, and then dried.
  • Photosensitive solution Chemical g/m2 Ester compound of naphtoquinone-1,2-diazido-5-sulfonyl chloride and pyrogallol-acetone resin 0.45 Cresol formaldehyde resin 1.10 t-Butyl phenol formaldehyde resin 0.05 Tetrahydrophtalic acid anhydride 0.09 Naphtoquinone-1,2-diazido-4-sulfonyl chloride 0.03 Ethyl violet 0.05 Megafac F-176 (fluorine containing surfactant, available from Dainippon Ink and Chemicals, Inc) 0.01 Methyl Ethyl ketone 6.0 1-Methoxy-2-propanol 4.0
  • the photosensitive planographic printing plate thus-prepared was subjected to exposure for 50 seconds with a metal halide lamp of 3 kW from a distance of 1m through a transparent positive film, and then it was subjected to development with a developing solution consisting of a 2 wt% aqueous solution of sodium silicate having a SiO 2 /Na 2 O ratio of about 1.1 and furthermore containing sodium ethylenediaminetetraacetate (0.01 g/l).
  • the development process is followed by water rinsing and subsequent gumming in gum arabic, whereby the planographic printing plates were prepared.
  • a printing test was carried out in a usual procedure using the planographic printing plate thus-prepared. 200.000 copies with high quality were obtained from all 10 trials.
  • an aluminium strip (alloy AA1050) having a thickness of 5.0 mm was formed and coiled.
  • the strip was cold rolled to a thickness of 2.2 mm, then annealed at 380°C for 4 hours, and further cold rolled to form an aluminium support with a thickness of 0.278 mm.
  • a similar test was repeated 10 times.
  • Each aluminium support formed as such was subjected to alkali etching as described in the Example 1.
  • Five out of the ten bottom surfaces at the casting revealed strong ripple formation, and 5 revealed slight ripple formation.
  • an aluminium strip (alloy AA1050) having a thickness of 5.0 mm was formed and coiled.
  • the strip was cold rolled to a thickness of 2.2 mm, then annealed at 520°C for 8 hours, and further cold rolled to form an aluminium support with a thickness of 0.278 mm.
  • the aluminium support formed as such was subjected to alkali etching.
  • the material was dipped in an aqueous solution of 25 weight % sodium hydroxide at 21°C for 7 minute, rinsed by running water, and dried.
  • the top surface at the casting did not reveal any ripple formation.
  • the bottom side during casting showed a clear, wave-like pattern know as ripple mark.
  • the upper surface at the casting of the support was etched with a 25% aqueous solution of sodium hydroxide at 50°C such that etched amount was 5 g/m2, after washing the etched plate with water, the plate was immersed in an aqueous sulphuric acid of 180 g/l at 50°C for 20 seconds to desmut the plate, and the plate was washed with water.
  • the support was electrochemically grained in 10 g/l of an aqueous nitric acid solution using the alternating (wave form ) electric current in the manner as described in example 1.
  • the quantity of electricity in the anode time became 280 coulomb/dm2.
  • An anode surface oxide coating of 3.5 g/m2 was formed on the support in a 20% sulphuric acid, and then dried.
  • composition was coated on the aluminium plate thus-prepared in a dry coated weight of 1.0 g/m2 to provide a heat-sensitive layer.
  • Cyanine dye A (having the structure shown below) 0.025 g Megafac F177 manufactured by DAINIPPON INK & CHEMICALS, INC. 0.01 g Ethyl violet Methyl ethyl ketone 0.05 1-Methoxy-2-propanol 20.1 g 2.7 g
  • the thus obtained heat sensitive plate was imaged in a Creo Trendsetter model 3244, and developed in the developer described in Example 2. Printing plates of excellent quality with good uniform appearance were obtained.

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  • Chemical Kinetics & Catalysis (AREA)
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EP04076742A 2003-06-12 2004-06-11 Verfahren zur Herstellung einer Flachdruckplatte Expired - Lifetime EP1486348B1 (de)

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EP04076742A EP1486348B1 (de) 2003-06-12 2004-06-11 Verfahren zur Herstellung einer Flachdruckplatte

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Application Number Priority Date Filing Date Title
EP03076834A EP1486347A1 (de) 2003-06-12 2003-06-12 Substrat aus Aluminium-Legierung für lithographische Druckplatten und Verfahren zu seiner Herstellung
EP03076834 2003-06-12
EP04076742A EP1486348B1 (de) 2003-06-12 2004-06-11 Verfahren zur Herstellung einer Flachdruckplatte

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EP1486348A2 true EP1486348A2 (de) 2004-12-15
EP1486348A3 EP1486348A3 (de) 2005-08-31
EP1486348B1 EP1486348B1 (de) 2013-01-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1543899A2 (de) * 2003-12-17 2005-06-22 Fuji Photo Film B.V. Substrat aus Aluminium-Legierung für lithographische Druckplatten und Verfahren zu seiner Herstellung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPH05156414A (ja) 1991-12-02 1993-06-22 Fuji Photo Film Co Ltd 平版印刷版用支持体の製造方法

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JP3454578B2 (ja) * 1993-08-31 2003-10-06 日本軽金属株式会社 平版印刷版用アルミニウム合金素板およびその製造方法
JP3290274B2 (ja) * 1993-11-15 2002-06-10 富士写真フイルム株式会社 平版印刷版支持体の製造方法
JPH10258340A (ja) * 1997-03-14 1998-09-29 Fuji Photo Film Co Ltd 平版印刷版用アルミニウム支持体及びその製造方法
DE19900427A1 (de) * 1999-01-08 2000-07-13 Sms Demag Ag Verfahren und Vorrichtung zum Entzundern einer Oszillationsmarken aufweisenden Oberfläche eines Gußstranges aus einer Stranggießanlage

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JPH0379798A (ja) 1989-08-22 1991-04-04 Fuji Photo Film Co Ltd 平版印刷版用支持体の製造方法
JPH05156414A (ja) 1991-12-02 1993-06-22 Fuji Photo Film Co Ltd 平版印刷版用支持体の製造方法

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Publication number Priority date Publication date Assignee Title
EP1543899A2 (de) * 2003-12-17 2005-06-22 Fuji Photo Film B.V. Substrat aus Aluminium-Legierung für lithographische Druckplatten und Verfahren zu seiner Herstellung
EP1543899A3 (de) * 2003-12-17 2005-12-21 Fuji Photo Film B.V. Substrat aus Aluminium-Legierung für lithographische Druckplatten und Verfahren zu seiner Herstellung

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