EP0786337A2 - Procédé pour l'écriture sur plaques d'impressions effaçables - Google Patents

Procédé pour l'écriture sur plaques d'impressions effaçables Download PDF

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Publication number
EP0786337A2
EP0786337A2 EP97100579A EP97100579A EP0786337A2 EP 0786337 A2 EP0786337 A2 EP 0786337A2 EP 97100579 A EP97100579 A EP 97100579A EP 97100579 A EP97100579 A EP 97100579A EP 0786337 A2 EP0786337 A2 EP 0786337A2
Authority
EP
European Patent Office
Prior art keywords
printing form
toner particles
printing
particles
liquid toner
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.)
Granted
Application number
EP97100579A
Other languages
German (de)
English (en)
Other versions
EP0786337A3 (fr
EP0786337B1 (fr
Inventor
Alfons Schuster
Michael Schönert
Alfred Dr. Hirt
Robert Weiss
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
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0786337A2 publication Critical patent/EP0786337A2/fr
Publication of EP0786337A3 publication Critical patent/EP0786337A3/fr
Application granted granted Critical
Publication of EP0786337B1 publication Critical patent/EP0786337B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/34—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner
    • G03G15/342—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by forming a uniform powder layer and then removing the non-image areas

Definitions

  • the invention relates to a method for imaging and deleting an erasable printing form according to claim 1
  • a method is known from EP 0 099 264 A2 for imaging a printing form with dry toner particles.
  • the entire surface of a substrate is covered with electrostatically charged dry toner particles, then these are melted by laser light in the image areas so that they adhere firmly to the substrate.
  • EP 0 580 394 A2 discloses a method for imaging a lithographic plate by applation. According to an image to be printed, portions of a plastic layer are removed by laser radiation.
  • a particular advantage of the printing form according to the invention is that it can be deleted. It is also advantageous that the printing form can be imaged within a printing press.
  • the printing form is preferably designed as a sleeve without a clamping channel on the forme cylinder. An electrical potential can be applied to the forme cylinder in order to then accentuate the printing form, as in electrophotographic processes.
  • the invention also relates to an erasable printing form, according to claim 12.
  • a printing form 1 (FIG. 1) is imaged with charged particles 2.
  • the printing form 1 consists of either a conductive or a dielectric, electrically chargeable material. It is either a film, for example made of a plastic such as polyester or a metal, e.g. As aluminum, a ceramic or a glass. Suitable materials are known from DE 44 26 012 A1. Alloys, for example nickel-chromium steels, nickel-chromium-iron alloys or nickel-chromium-molybdenum alloys, are also particularly suitable.
  • the surface of the printing form 1 is preferably hydrophilic or hydrophilizable.
  • the printing form 1 consists of an electrically conductive material, while the particles are being applied, a potential opposite to their charges or to their charge distributions which are effective in the direction of the surface of the printing form 1, is applied to the printing form 1 while the particles 2 are being applied. The particles 2 are attracted by the coulomb force. If the printing form 1 consists of an electrically non-conductive material on the surface, an electrically conductive layer must be present under this layer in order to charge the surface layer by means of a voltage source, for example by means of corona electrodes.
  • the particles 2 are preferably toner particles.
  • the toner particles 2 either have color pigments or they are unpigmented.
  • the particles 2 preferably have a diameter of less than 1 ⁇ m. Due to the electrostatic attraction between the surface of the printing form 1 and the particles 2, a uniform, very thin layer can be produced. Subsequently, image information is applied by means of high-energy electromagnetic radiation, in particular laser radiation, in accordance with an image to be printed by printing form 1.
  • a beam 3 (FIG. 2) is guided in the image area over the layer 4 formed by the particles 2 on the printing form 1. As a result, the particles 2 crosslink in the layer 4, as a result of which the adhesion to the surface of the printing form 1 is increased compared to the unirradiated areas on the printing form 1.
  • the particles 2 in the unirradiated area are then completely removed from the surface of the printing form 1 either by mechanical treatment, by electrical means or by means of ultrasound, for example by means of an ultrasound basin.
  • the resulting image can also be post-treated in order to further increase the strength of the layer 4 on the surface of the printing form 1.
  • the wavelength of the rays used for this purpose for example infrared or ultraviolet, depends on the absorption maximum of the material of the layer 4, ie the particle 2.
  • the printing form 1 contains a material that absorbs the infrared radiation, for example carbon, at least in the superficial range, or if it has a black color.
  • pigmented toner particles for example toner particles, the soot or graphite contain, are particularly suitable for absorbing infrared radiation.
  • particles 2 which absorb ultraviolet radiation are also suitable if the absorption of this radiation favors electrical bonds of the particles 2 for crosslinking and further strengthening the image areas of the layer 4.
  • the strength and duration of action of the radiation and their wavelength thus depend on the material of the particles 2, on the material from which the printing form 1 is made, and on the material combination of the particles 2 and the printing form 1.
  • the surface of the printing form 1 can be subjected to a further treatment at the non-image areas, ie at the areas in which the layer 4 has not been removed, for example by hydrophilization, so that it accepts a dampening solution, provided that the printing process uses a dampening solution used, as is the case for example in wet offset printing.
  • the hydrophilization of the surface of the printing form 1 can also take place before the application of the particles 2 over the entire surface, if it is necessary. After the printing process has ended, the surface of printing form 1 must be restored.
  • the ink remaining on layer 4 and the free areas of printing form 1 must be removed, and then the particles 2 in layer 4 are removed.
  • a solvent e.g. B. acetone
  • Ultrasound treatment is also suitable for removing the image areas of layer 4.
  • the thickness of the layer 4 is preferably 1 ⁇ m or less. But it can also be much thinner, for example only 0.1 ⁇ m thick.
  • the particles 2 do not necessarily have to carry their own charge. Materials whose particles have dipole, qudrupole or other multipole moments which align in the electric field are also suitable, so that they are attracted to an electrically charged surface such as the surface of the printing form 1.
  • the particles 2 are in particular toner particles, wherein the toner can be a solid or a liquid toner. Both water-based toners and oil-based toners can be used.
  • the toner can be pigmented (transparent) or unpigmented.
  • the toner is unpigmented, if the particles 2 are to be crosslinked by heat radiation on the surface of the printing form 1, the surface of the printing form 1 itself must absorb the infrared radiation, whereby the particles 2 are indirectly heated so that their crosslinking is prevented the surface of the printing form 1 occurs. Likewise, the adherence of the particles 2 to the printing form 1 is also supported by this infrared radiation.
  • particles with different charge densities Q / m
  • Methods in which the particles 2 are broken down by negative pressure are also suitable for removing particles 2 not crosslinked by the jet 3 on the surface of the printing form 1.
  • the particles 2 can also be removed by electrophoresis, an electrical potential being applied to a body which is brought close to the printing form - the body is, for example, a roller - which is stronger than the potential of the printing form 1. This means that that if the printing form 1 is at a negative potential, the roller must have an even more negative potential in order to pull off the particles 2, which in this case are positively charged or have an electrical multipole which has a positive effect on the outside, from the printing form 1.
  • the differentiation of the ink acceptance behavior of the layer 4 applied according to FIG. 1 can also be achieved in that the layer 4 is removed (ablated) according to the print image to be generated by laser radiation or at least decomposed, so that it has a different acceptance behavior for one Ink or fountain solution.
  • the remaining toner particles 2 of the layer 4 are then crosslinked on the surface of the printing form 1 by heat treatment, in particular by electromagnetic radiation. This means that the step of removing (see FIG. 3) is omitted in this case.
  • the fixation of the particles 2 in the layer 4 on the printing form 1 described with reference to FIG. 2 is already sufficiently strong, it is not necessary after this treatment step and after removing unnecessary particles 2 the particles 2 remaining on the printing form 1 to fix once with a heat or radiation treatment. If, however, the irradiation by the laser beam 3 has only partially crosslinked the particles 2 in the image areas, these can be removed after the particles 2 have been removed in the non-image areas by treating the entire surface of the printing form 1 including the surface fix the remaining parts of the image of layer 4 on the printing plate 1 by means of heat, in particular with infrared radiation or by means of hot air, in such a way that they remain adherent for the duration of a print job.
  • the non-irradiated and thus uncrosslinked particles 2 need not be removed from the surface of the printing form 1, since the cleaning takes place in a cleaning step preceding the printing process or, if this is omitted, the first revolutions of the printing unit already cause these particles 2 to be released to the printing material.
  • the high-energy radiation for fixing the particles 2 on the surface of the printing form 1 can also be achieved by incoherent light sources, for example a mercury vapor lamp.
  • incoherent light sources for example a mercury vapor lamp.
  • solvents for example n-methylpyrolidone, acidic or alkaline aqueous solutions, contacting cleaning agents which act mechanically on the printing form surface or the application of water or a solvent jet under high pressure, in particular at high temperature, are also suitable.
  • High-energy radiation is also suitable for removing non-crosslinked particles 2 from the surface of the printing form 1. In this case, however, the radiation may only be directed to those areas where the particles 2 have not previously (or simultaneously) been crosslinked by the beam 3.
  • the method used according to the invention has the advantage that the printing form can be produced within the printing press itself.
  • a sleeve-like printing form can also be used.
  • Such a sleeve-like printing form can be replaced by removing it from the side wall of a printing unit of the printing press, particularly if the surface of the printing form no longer has the desired surface roughness.
  • a printing film which, for example, can be wound onto the forme cylinder, as is known from DE 43 03 872 C2.
  • the fact that the layer 4 is only very thin means that only little material is used.
  • the thickness of the layer 4 can be easily controlled and reproduced in the electrostatic application by varying the voltage and / or time.
  • a small and flexibly constructed and easily exchangeable imaging unit can be used. Toner particles or other particles 2 with different chemical and physical properties can be used. Conventional printing forms based on an aluminum layer or another metal can also be used to illustrate them according to the invention. The imaging process can also be carried out outside the printing press.
  • a method for imaging a printing form 1 is created, in which the printing form 1 is loaded over the entire area and coated over the entire area with particles 2, in particular toner particles 2, which are charged in opposite directions. Subsequently, the layer 4 formed by the particles 2 is fixed imagewise by a beam 3, in particular by a laser beam, in particular by infrared radiation, on the surface of the printing form 1 or is ablated imagewise. The non-fixed portions of layer 4 are then removed or the non-ablated portions are fixed by heat treatment over the entire surface.
EP97100579A 1996-01-24 1997-01-16 Procédé pour l'écriture sur plaques d'impressions effaçables Expired - Lifetime EP0786337B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19602328A DE19602328A1 (de) 1996-01-24 1996-01-24 Verfahren zum Bebildern einer löschbaren Druckform
DE19602328 1996-01-24

Publications (3)

Publication Number Publication Date
EP0786337A2 true EP0786337A2 (fr) 1997-07-30
EP0786337A3 EP0786337A3 (fr) 1998-02-11
EP0786337B1 EP0786337B1 (fr) 2001-09-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100579A Expired - Lifetime EP0786337B1 (fr) 1996-01-24 1997-01-16 Procédé pour l'écriture sur plaques d'impressions effaçables

Country Status (5)

Country Link
US (1) US6796237B2 (fr)
EP (1) EP0786337B1 (fr)
JP (1) JP3190275B2 (fr)
CA (1) CA2195826C (fr)
DE (2) DE19602328A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0974455A1 (fr) * 1998-07-16 2000-01-26 Agfa-Gevaert N.V. Procédé à sec de préparation d'un précurseur de plaque lithographique obtenue par voie thermique
EP1031415A1 (fr) * 1999-02-23 2000-08-30 Agfa-Gevaert N.V. Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique
EP1090750A2 (fr) * 1999-10-01 2001-04-11 Koenig & Bauer Aktiengesellschaft Procédé de traitement de plaques d'impression dans des machines d'impression
EP1097811A1 (fr) * 1999-11-03 2001-05-09 Agfa-Gevaert N.V. Procédé de fabrication d'une plaque d'impression lithographique travaillant en négatif et sans ablation
US6244181B1 (en) 1998-07-16 2001-06-12 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
DE10008213A1 (de) * 2000-02-23 2001-08-30 Roland Man Druckmasch Einrichtung zur thermischen Energieeinkopplung
EP1177914A2 (fr) * 2000-08-04 2002-02-06 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et appareil pour régénérer une plaque d'impression réutilisable
EP1179426A2 (fr) * 2000-08-09 2002-02-13 Koenig & Bauer Aktiengesellschaft Procédé de fabrication d'une plaque d'impression
US6701108B2 (en) * 2001-06-05 2004-03-02 Minolta Co., Ltd. Non-fixing type image forming method and non-fixing type image forming apparatus

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
IL122953A (en) * 1998-01-15 2000-11-21 Scitex Corp Ltd Printing member for use with a printing system and method of imaging the printing member
US6250225B1 (en) * 1998-07-16 2001-06-26 Agfa-Gevaert Thermal lithographic printing plate precursor with excellent shelf life
US6357353B1 (en) 1999-02-23 2002-03-19 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
DE19911906A1 (de) 1999-03-17 2000-09-28 Wifag Maschf Bebilderung einer Druckform für einen Nassoffsetdruck
DE19942409A1 (de) * 1999-09-06 2001-03-08 Heidelberger Druckmasch Ag Abbrand-Aufnehmerrolle in einem Druckplattenbelichter
WO2001019613A1 (fr) * 1999-09-15 2001-03-22 Scitex Corporation Ltd. Systeme d'imprimerie sans plaque
US6399280B1 (en) 1999-11-03 2002-06-04 Agfa-Gevaert Method for making a lithographic printing plate by a negative working non-ablative process
US6487970B2 (en) * 2000-01-18 2002-12-03 Agfa-Gevaert Method of lithographic printing with a reusable substrate
US6742454B2 (en) * 2001-10-30 2004-06-01 Heidelberger Druckmaschinen Ag Method for modifying an image surface of a printing plate
US7121209B2 (en) * 2004-01-16 2006-10-17 Nandakumar Vaidyanathan Digital semiconductor based printing system and method
JP2011112871A (ja) * 2009-11-26 2011-06-09 Canon Inc 印刷装置および印刷方法
CN105050812B (zh) * 2012-11-30 2016-09-07 惠普发展公司，有限责任合伙企业 施加电场以擦除打印介质的区域

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EP0099264A2 (fr) 1982-07-09 1984-01-25 Vickers Plc Plaques d'impression
EP0580394A2 (fr) 1992-07-20 1994-01-26 Presstek, Inc. Méthode et appareil pour l'enregistrement par laser
DE4303872C2 (de) 1992-04-24 1995-08-10 Roland Man Druckmasch Druckmaschine mit einem Formzylinder und Verfahren zur Druckvorbereitung des Formzylinders
DE4426012A1 (de) 1994-07-22 1996-01-25 Roland Man Druckmasch Löschbare Druckform sowie Verfahren und Vorrichtung zum Löschen und Regenerieren der Druckform

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Publication number Priority date Publication date Assignee Title
EP0099264A2 (fr) 1982-07-09 1984-01-25 Vickers Plc Plaques d'impression
DE4303872C2 (de) 1992-04-24 1995-08-10 Roland Man Druckmasch Druckmaschine mit einem Formzylinder und Verfahren zur Druckvorbereitung des Formzylinders
EP0580394A2 (fr) 1992-07-20 1994-01-26 Presstek, Inc. Méthode et appareil pour l'enregistrement par laser
DE4426012A1 (de) 1994-07-22 1996-01-25 Roland Man Druckmasch Löschbare Druckform sowie Verfahren und Vorrichtung zum Löschen und Regenerieren der Druckform

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0974455A1 (fr) * 1998-07-16 2000-01-26 Agfa-Gevaert N.V. Procédé à sec de préparation d'un précurseur de plaque lithographique obtenue par voie thermique
US6244181B1 (en) 1998-07-16 2001-06-12 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
EP1031415A1 (fr) * 1999-02-23 2000-08-30 Agfa-Gevaert N.V. Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique
EP1090750A2 (fr) * 1999-10-01 2001-04-11 Koenig & Bauer Aktiengesellschaft Procédé de traitement de plaques d'impression dans des machines d'impression
EP1090750A3 (fr) * 1999-10-01 2001-08-22 Koenig & Bauer Aktiengesellschaft Procédé de traitement de plaques d'impression dans des machines d'impression
EP1097811A1 (fr) * 1999-11-03 2001-05-09 Agfa-Gevaert N.V. Procédé de fabrication d'une plaque d'impression lithographique travaillant en négatif et sans ablation
DE10008213A1 (de) * 2000-02-23 2001-08-30 Roland Man Druckmasch Einrichtung zur thermischen Energieeinkopplung
US6452622B2 (en) 2000-02-23 2002-09-17 Man Roland Druckmaschinen Ag Device for thermal energy injection
DE10008213B4 (de) * 2000-02-23 2005-12-08 Man Roland Druckmaschinen Ag Einrichtung zur thermischen Energieeinkopplung
EP1177914A2 (fr) * 2000-08-04 2002-02-06 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et appareil pour régénérer une plaque d'impression réutilisable
DE10037998A1 (de) * 2000-08-04 2002-02-14 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zum Löschen einer wiederbebilderbaren Druckform
EP1177914A3 (fr) * 2000-08-04 2003-08-20 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et appareil pour régénérer une plaque d'impression réutilisable
EP1179426A2 (fr) * 2000-08-09 2002-02-13 Koenig & Bauer Aktiengesellschaft Procédé de fabrication d'une plaque d'impression
EP1179426A3 (fr) * 2000-08-09 2003-08-20 Koenig & Bauer Aktiengesellschaft Procédé de fabrication d'une plaque d'impression
US6701108B2 (en) * 2001-06-05 2004-03-02 Minolta Co., Ltd. Non-fixing type image forming method and non-fixing type image forming apparatus

Also Published As

Publication number Publication date
US20030089260A1 (en) 2003-05-15
EP0786337A3 (fr) 1998-02-11
DE19602328A1 (de) 1997-07-31
US6796237B2 (en) 2004-09-28
EP0786337B1 (fr) 2001-09-19
DE59704626D1 (de) 2001-10-25
JP3190275B2 (ja) 2001-07-23
JPH09201931A (ja) 1997-08-05
CA2195826C (fr) 2001-09-04
CA2195826A1 (fr) 1997-07-25

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