EP0352612B1 - Verfahren zur Herstellung einer Druckform - Google Patents

Verfahren zur Herstellung einer Druckform Download PDF

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Publication number
EP0352612B1
EP0352612B1 EP89113215A EP89113215A EP0352612B1 EP 0352612 B1 EP0352612 B1 EP 0352612B1 EP 89113215 A EP89113215 A EP 89113215A EP 89113215 A EP89113215 A EP 89113215A EP 0352612 B1 EP0352612 B1 EP 0352612B1
Authority
EP
European Patent Office
Prior art keywords
electrode
process according
counter
carrier
printing
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
EP89113215A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0352612A1 (de
Inventor
Gerhard Prof. Kossmehl
Matthias Niemitz
Detlef Kabbeck-Kupijai
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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
Priority claimed from DE19883825850 external-priority patent/DE3825850A1/de
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0352612A1 publication Critical patent/EP0352612A1/de
Application granted granted Critical
Publication of EP0352612B1 publication Critical patent/EP0352612B1/de
Anticipated expiration legal-status Critical
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
    • B41C1/1008—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

  • the invention relates to a method for producing a printing form, in which the printing form is locally influenced by means of electrochemical or electrical control signals output by a control device.
  • the printing forms for the planographic printing process which are customary today are generally produced outside the printing press by photochemical means, resulting in downtimes of the machine and personnel costs for the replacement of the printing forms.
  • Electronically stored data containing all of the information can be used today for the production of the printing forms.
  • a printing press is known from EP-A 101266 with which such electronically coded printing information is used in order to carry out a direct production or new production of the printing form located in the printing press. As a result, it is no longer necessary to change the printing form and the associated downtime of the machine and the personnel expenses.
  • the known printing press is characterized in that the printing form cylinder surface has a hydrophilic surface forming the printing form, which is washed by means provided in the printing press, coated with a hydrophobic layer and then, for. B. can be acted upon by a laser beam.
  • the redesign The printing form requires a short interruption of the printing process by switching on the washing, coating and laser device when the image changes while the machine is in operation. The previous color layer is washed off and the hydrophobic layer is renewed, which is removed locally with the laser beam in accordance with the image to be printed. The laser beam is controlled using the coded print information.
  • the method consists in using a printing form completely coated with an electrically conductive polymer.
  • the differentiation into image and non-image areas is achieved by an electrochemical influence on the polymer layer, which can be either in a hydrophilic or a hydrophobic form.
  • This method is further developed according to the invention in accordance with claims 1 and 2 in such a way that a polymer is deposited and removed again on an electrically conductive carrier material at the locations provided for this purpose.
  • the printing form is coated with a polymer, either a hydrophilic support with a hydrophobic or a hydrophobic support with a hydrophilic polymer, or the printing form is completely coated and partly removed and completely coated again for redesign.
  • a polymer is electrochemically generated on the substrate from a solution containing a suitable monomer at the designated locations.
  • the polymer can be removed electrochemically in the absence of the monomer, so that the original can be deleted and rewritten.
  • the carrier material for the artwork is electrically conductive, which means that it functions as an electrode in the electrochemical deposition or removal of the polymer. If, according to one embodiment of the invention, the support represents the non-image areas on the printing original, the support material must be correspondingly hydrophilic in order to be able to hold off the printing ink in connection with the fountain solution.
  • hydrophilic carrier material z. B. nickel or its alloys, which have the required hydrophilicity after suitable chemical and / or electrochemical pretreatment.
  • a printing form whose surface consists of nickel is exposed to an anodic current (preferably 10-500 mA / cm2) in a suitable electrolyte.
  • an electrolyte preferably 10-500 mA / cm2
  • B dilute nitric acid.
  • the nickel is thus electrochemically etched and given a surface structure that is favorable for the adhesion of the polymer.
  • the material with which the carrier is coated is an electrically conductive polymer. It is known that aromatics and heteroaromatics or their substitution products can be oxidized electrochemically and polymerized in the process. This creates coatings on the anode, the properties (adhesion, wetting behavior) of which depend very much on the test parameters (anode surface, monomer, concentrations, electrolyte, temperature, current density, etc.).
  • Aromatics and heteroaromatics such as thiophene, pyrrole, furan, indole, carbazole, benzothiophenes and their substitution products such as 3-alkyl-, primarily 3-methyl-, 3-alkyloxy- are particularly suitable as monomers which can be converted into suitable polymers by oxidized polymerization.
  • 3,4-dialkyloxy- mainly 3-methoxy-, 3,4-dimethoxy-, 3-alkylthio-, especially 3-methylthio-, 3,4-bis (methylthio) thiophene, pyrrole, furan, 2, 2′-bithienyl, 2,2 ′, 5 ′, 2 ⁇ -terthienyl, Di-2-thienyl sulfide, methane, 1,2-di-2-thienylethylene, aniline, substituted anilines, p-phenylenediamine, diphenylamine, 4,4'-diaminodiphenylmethane, ether, sulfide or mixtures of the monomers mentioned.
  • Inert salts are used as conductive salts under the conditions of the electrochemical reaction, in particular inorganic conductive salts such as ammonium, lithium, sodium tetrafluoroborates, -perchlorates, -sulfates, -hydrogen sulfates; quaternary ammonium salts such as tetraalkylammonium perchlorates, tetrafluoroborates, hexafluorophosphates, hexafluoroantimonates, hexafluoroarsenates, methanesulfonates, toluenesulfonates, trifluoromethanesulfonates, trifluoroacetates; other alkyl sulfonates and sulfates such as lauryl sulfate and other anionic surfactants such as e.g.
  • B. alkyl carboxylates These salts are dissolved in solvents which are also inert under the conditions of the electrochemical reaction, such as acetonitrile, 1,2-dimethoxyethane, methanesulfonic acid, dichloromethane, 1-methyl-2-pyrrolidone, nitrobenzene, nitroethane, nitromethane, dichloromethane, propionitrile, propylene carbonate, Tetrahydrofuran, benzonitrile and sulfolane, water, water in combination with surfactants or mixtures of the solvents mentioned.
  • solvents which are also inert under the conditions of the electrochemical reaction, such as acetonitrile, 1,2-dimethoxyethane, methanesulfonic acid, dichloromethane, 1-methyl-2-pyrrolidone, nitrobenzene, nitroethane, nitromethane, dichloromethane, propionitrile, propylene carbonate, Tetrahydrofuran
  • the printing form is assigned an electrolyte solution and electrodes, which are integrated into the printing press.
  • the electrolyte solution preferably contains conductive salts which are inert under the conditions of the electrochemical reaction and have sufficient solubility in the solvent used in each case.
  • the monomer or the monomer mixture from the electrolyte solution is deposited on the appropriately pretreated carrier material using a current density of preferably 0.1 to 20 mA / cm 2 as a polymer at the locations provided for this purpose.
  • the polymer must be removed at the points to be deleted. In the absence of the monomer, this is also done electrochemically with an anodic current of preferably 10-500 mA / cm2 in suitable electrolytes, such as, for. B. dilute nitric acid, with the same control as in the deposition.
  • suitable electrolytes such as, for. B. dilute nitric acid
  • Fig. 1 the image transfer cylinders of a printing press are shown, which work according to the flat printing or offset printing method.
  • the paper 10 to be printed is guided between a printing cylinder 11 and a rubber cylinder 12 and thereby takes up the printing ink applied to the rubber cylinder 12.
  • the color distributed in accordance with a typeface or a graphic image is transferred from a printing form 13, which is clamped on a likewise rotatable forme cylinder 14, to the rubber cylinder 12.
  • the image to be printed is imaged on the printing form 13 by areas which are water-repellent, ie. H. are hydrophobic.
  • the printing form 13 passes through a dampening unit 15.
  • the hydrophobic areas are not wetted by the dampening solution on the surface, while the dampening solution is bound to the hydrophilic areas.
  • the moistened surface then passes through an inking unit 16, with which the printing ink is applied.
  • the hydrophilic areas do not accept any printing ink.
  • the color is assumed at the hydrophobic areas representing the image parts.
  • the printing form consists of a carrier made of an electrically conductive material that is either hydrophilic or hydrophobic.
  • the carrier 13 can also be an electrically conductive layer which forms the surface of a printing plate or a forme cylinder 14.
  • a washing system 17 and an electrolyte system 18 are also provided in the printing press. After completing the print sequence, an image will be printed without the press switch off, the washing system 17 and the electrolyte system 18 switched on. After the printing ink has been delivered to the rubber cylinder 12, the printing form 13 passes through the washing system 17, with which the ink residues are washed off the printing form, in order to be subsequently acted upon by the electric field of the electrolyte system 18, with which the polymer applied in places on the carrier 13 according to an image Will get removed.
  • the redesign of the printing form 13 to produce a new image is carried out as follows.
  • the printing form 13 is in contact with an electrolyte solution 20 containing a monomer and is located with the latter between a first electrode 21, which is formed by the forme cylinder 14, and a counter electrode 22, which is designed as an electrode roller according to FIG. 1.
  • the electrolytic solution 20 consists of a conductive salt dissolved in a sufficient amount in a solvent.
  • an information transmission unit 24 which consists of an information distribution system 25 located in the editorial office and a control unit 26 located on or in the printing press.
  • the entire information intended for printing is electronically stored via so-called full-page break systems or full-page assembly systems for newspaper and illustration printing, or electronically encoded on the way via facsimile transmission systems.
  • These Information is passed on via an interface to a machine computer, which processes the information into control signals 27 with which the electrodes 21, 22 are acted upon by voltage or current pulses 23 via microprocessors 28.
  • the image is broken down into halftone dots, as is customary in printing technology.
  • a grid of 30 / cm is common in newspaper printing, and a grid of 120 / cm in high-quality illustration printing.
  • Each of these halftone dots must be separately controllable in order to produce the print areas by reversing them according to the image.
  • the electrode 21 located on the surface of the forme cylinder 14 is designed as an electrode matrix, each electrode element being assigned to a grid point.
  • FIG. 3 shows a top view of the greatly enlarged electrode matrix 21.
  • a plurality of microprocessors 28 are provided for controlling the individual electrode elements 30, a certain number of electrode elements 30 being assigned to a microprocessor 28.
  • the microprocessors are arranged in the forme cylinder 14 on the back of the electrode 21, as shown in cross-section in FIG. 1 and with thicker lines in FIG. 3. For example, a 1 cm 2 grid area could each be controlled by a microprocessor 28.
  • the electrode elements 30 (FIG. 3) are or are not controlled with the control device, depending on whether the point in question already has the state desired for the new image or not.
  • the electrode elements 30 can be driven in sequence or line by line at the same time.
  • the electrolyte solution 20 located in a container is conveyed by the counter electrode roller 22, which is designed as a homogeneous electrode with a rough surface.
  • the electrolyte solution can also be introduced into the reversing zone with a separate feed device.
  • the counter-electrode roller 22 is rotated, thereby entraining an electrolyte film 40 over the rough surface and conveying it into the gap 29 between the printing form 13 and the counter-electrode (22).
  • the applied polymer is removed again for a redesign of the image.
  • a further variant is the formation of an electrode with a sieve-like outer surface, through which electrolyte solution is pressed into the contact zone 29 under sufficient pressure during the rewriting process and the color is thereby kept out of the gap. This makes it possible to save a separate cleaning process with a separate washing system 17.
  • the electrode on the forme cylinder 14 can be made homogeneous and the counter electrode 22 can be designed in a matrix.
  • the counter electrode 22 can be designed in a matrix.
  • a matrix electrode as the counter electrode, it can also be made in several parts. If several counter electrodes are used, the grid density can be reduced. It is conceivable to produce the matrix electrode from electrode strips in single or multiple grid spacing or to use only one electrode line with which the entire printing form is treated line by line by the printing form (13) passing through the forming zone.
  • Another way of producing the matrix electrode is to use a homogeneous electrode, for example a metal roller, which is coated with a photoconductor.
  • a homogeneous electrode for example a metal roller, which is coated with a photoconductor.
  • 5 shows an exemplary embodiment in which the forme cylinder (51) receiving the printing form (50) is designed as a homogeneous electrode, while the counter electrode (52) takes over the function of the matrix electrode.
  • the counter electrode consists of a homogeneous electrode jacket, for example made of metal, which is coated with a photoconductor 53.
  • the photoconductor is imagewise exposed on a surface line of the counter electrode 52 by means of a radiation source 54.
  • the photoconductor 53 becomes conductive at the exposed points 55, so that when the conductive point 55 enters the contact zone 56 to the forme cylinder 51, the required current between the Forme cylinder electrode 51 and the counter electrode 53 can flow to reverse the printing form 50.
  • the information to be transmitted is here controlled via the light source 54 and briefly stored on the photoconductor 53.
  • the photoconductor preferably has the property of only briefly maintaining the conductivity introduced by the exposure.
  • the conductivity should be maintained up to the contact zone 56. After the line to be transferred has left the contact zone 56 again, the conductive points 52 do not have to become conductive again in order to allow a new description for the next rotation of the counter electrode 53.
  • organic photoconductors can be used as the photoconductor 53.
  • the desired opening and closing requirements of the photoconductor 53 can be influenced by applying or introducing afterglow substances in such a way that the conductive state is prolonged in time.
  • a thermal treatment is also conceivable with which the exposed areas 57 are acceleratedly rendered non-conductive after passing through the contact point 56. Otherwise, the diameter of a drum-like counter electrode 53 and the arrangement of the radiation source 54 will be determined in accordance with the opening and closing characteristics of the selected photoconductor.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP89113215A 1988-07-29 1989-07-19 Verfahren zur Herstellung einer Druckform Expired - Lifetime EP0352612B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883825850 DE3825850A1 (de) 1987-02-20 1988-07-29 Verfahren zur herstellung einer druckform
DE3825850 1988-07-29

Publications (2)

Publication Number Publication Date
EP0352612A1 EP0352612A1 (de) 1990-01-31
EP0352612B1 true EP0352612B1 (de) 1993-03-10

Family

ID=6359871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113215A Expired - Lifetime EP0352612B1 (de) 1988-07-29 1989-07-19 Verfahren zur Herstellung einer Druckform

Country Status (4)

Country Link
US (1) US5145758A (ja)
EP (1) EP0352612B1 (ja)
JP (1) JPH0274344A (ja)
DE (1) DE58903702D1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245866B (en) * 1990-07-07 1995-03-15 Heidelberger Druckmasch Ag Printing machine with print image formation system
DE4235242C1 (de) * 1992-10-20 1993-11-11 Roland Man Druckmasch Löschbare Druckform
GB2304629B (en) * 1995-09-07 1998-09-23 Kodak Ltd Electrode for use in writing information on a printing plate
GB2304628B (en) * 1995-09-07 1998-09-23 Kodak Ltd Printing plate product
JP3606047B2 (ja) 1998-05-14 2005-01-05 セイコーエプソン株式会社 基板の製造方法
US6374737B1 (en) 2000-03-03 2002-04-23 Alcoa Inc. Printing plate material with electrocoated layer
US6405651B1 (en) * 2000-03-03 2002-06-18 Alcoa Inc. Electrocoating process for making lithographic sheet material
GB2374818B (en) * 2001-04-23 2005-01-12 Secr Defence Surface for promoting droplet formation
US6610458B2 (en) 2001-07-23 2003-08-26 Kodak Polychrome Graphics Llc Method and system for direct-to-press imaging
US6742454B2 (en) * 2001-10-30 2004-06-01 Heidelberger Druckmaschinen Ag Method for modifying an image surface of a printing plate
JP2003261801A (ja) * 2002-03-08 2003-09-19 Brother Ind Ltd インクジェット記録用水性インク及びインクジェット記録方法
JP2016531389A (ja) * 2013-07-23 2016-10-06 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ リチウムイオン電池の電解質添加剤としてのオキシラニルアシル誘導体

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3106155A (en) * 1960-07-28 1963-10-08 Eastman Kodak Co Electrolytic recording with organic polymers
US3638567A (en) * 1969-05-13 1972-02-01 Xerox Corp Method of preparing and utilizing a gravure printing master
JPS5280902A (en) * 1975-12-26 1977-07-07 Fuji Xerox Co Ltd Offset printing method employing image recording element
DE2725093C3 (de) * 1977-06-03 1984-04-05 Rudolf Dr.-Ing. 2300 Kiel Hell Druckverfahren und Anordnung zu dessen Durchführung
EP0101266A3 (en) * 1982-08-09 1985-04-03 Milliken Research Corporation Printing method and apparatus
US4729310A (en) * 1982-08-09 1988-03-08 Milliken Research Corporation Printing method
US4718340A (en) * 1982-08-09 1988-01-12 Milliken Research Corporation Printing method
JPS59171963A (ja) * 1983-03-18 1984-09-28 Fuji Photo Film Co Ltd 電子写真製版材料
DE3416867A1 (de) * 1984-05-08 1985-11-14 Hoechst Ag, 6230 Frankfurt Einstufiges elektrochemisches bilderzeugungsverfahren fuer reproduktionsschichten
JPS61255898A (ja) * 1985-04-30 1986-11-13 インタ−ナショナル・ビジネス・マシ−ンズ・コ−ポレ−ション 熱的に誘導される化学変化を用いた改良印刷装置
DE3705439A1 (de) * 1987-02-20 1988-09-01 Man Technologie Gmbh Druckmaschine
US4849314A (en) * 1987-11-04 1989-07-18 E. I. Du Pont De Nemours And Company Photohardenable electrostatic master containing electron acceptor or donor
DE3740079A1 (de) * 1987-11-26 1989-06-08 Man Technologie Gmbh Elektrische aufzeichnungseinrichtung fuer druckformen von druckmaschinen

Also Published As

Publication number Publication date
DE58903702D1 (de) 1993-04-15
JPH0274344A (ja) 1990-03-14
US5145758A (en) 1992-09-08
EP0352612A1 (de) 1990-01-31

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