EP1077129A2 - Procédé et dispositif pour la formation réversible d'images sur une forme d'impression - Google Patents

Procédé et dispositif pour la formation réversible d'images sur une forme d'impression Download PDF

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Publication number
EP1077129A2
EP1077129A2 EP00116981A EP00116981A EP1077129A2 EP 1077129 A2 EP1077129 A2 EP 1077129A2 EP 00116981 A EP00116981 A EP 00116981A EP 00116981 A EP00116981 A EP 00116981A EP 1077129 A2 EP1077129 A2 EP 1077129A2
Authority
EP
European Patent Office
Prior art keywords
printing form
image information
image
laser source
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.)
Granted
Application number
EP00116981A
Other languages
German (de)
English (en)
Other versions
EP1077129A3 (fr
EP1077129B1 (fr
Inventor
Dirk Probian
Josef Dr. Schneider
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 EP1077129A2 publication Critical patent/EP1077129A2/fr
Publication of EP1077129A3 publication Critical patent/EP1077129A3/fr
Application granted granted Critical
Publication of EP1077129B1 publication Critical patent/EP1077129B1/fr
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
    • 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
    • B41N3/006—Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes
    • 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
    • B41C1/1091—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by physical transfer from a donor sheet having an uniform coating of lithographic material using thermal means as provided by a thermal head or a laser; by mechanical pressure, e.g. from a typewriter by electrical recording ribbon therefor

Definitions

  • the invention relates to a method for reversibly imaging a printing form by image-controlled heating of a surface by means of thermal transfer according to the preamble of claim 1.
  • Printing processes are known in which a printing form is preferably on a Printing form cylinder with a thermal transfer film Thermal transfer material is provided.
  • the transfer of the transfer material is preferably laser-induced, but also others Energy sources such as heating elements, lines, matrices or the like are conceivable would be.
  • the printing form is then used in particular for an offset process Ink colors, the ink of the ink-guiding areas is if necessary via a rubber roller onto the substrate to be printed transfer.
  • DE 38 09 915 A1 shows such a printing process.
  • the thermal transfer foil is with a thermo or electrothermal sensitive Provide coating that oleophilic, i.e. has ink-accepting properties.
  • the image information transfer unit includes a printhead which is one Row of heating elements, an electrode, an energy beam or any other heat generating unit, in particular a laser printhead.
  • the printhead is used to transmit image information via the corresponding Image signals controlled so that he is at each pixel heat and pressure on the Thermal transfer film initiates and thus a selective transfer of Coating the film on the surface of the printing form cylinder causes.
  • the Printing form cylinder rotates, the print head is traversed accordingly, see above that from the thermal transfer film, for example, spirally on the printing form the printing form cylinder can be illustrated.
  • the band-shaped used in the subject matter of EP 0 698 488 B1 Thermal transfer film is characterized by a comparatively thin coating with thermal transfer material.
  • the imaging layer thickness thus falls on the Printing form cylinder thin, so that this pictorial coating again can be easily lifted off, i.e. the printing form cylinder corresponding to the Reduction of the layer thickness of the thermal transfer material easier, or can be deleted more quickly.
  • thermotransfer-illustrated printing form i.e. the constant print quality over the total number of copies of a given to be printed Print product
  • layer thickness of the thermal transfer material depends. If this layer thickness is increased in favor of the durability, however, there are problems with lifting the imagewise coating the printing form when deleting what color veil, or ghosting, so so-called toning on the printing form or in the printed image.
  • an infrared radiation is transmitted from the point transmitted Thermal transfer material carried out on the layer formed on the printing form, whereby the adhesion to the surface of the printing form compared to unirradiated areas on the printing form is increased.
  • IR radiation also includes laser-induced heat input. It has however, it has been shown that this infrared curing (since carried out over a large area) A strong heating of individual areas of the printing form leads, in particular a subject-dependent, uneven heating of the imaging layer the printing form, i.e. that spot areas heat up more than graded areas Halftone image areas. In extreme cases, this means that the property of a improved circulation resistance is distributed unevenly on the printing form and due to the subject-dependent thermal expansion e.g. a loss of Register accuracy occurs or that for the printing form as a whole none improved circulation resistance was achieved.
  • the imaging energy is increased and the Pixels harden better, so that the durability of the Thermal transfer material layer is clearly improved without the layer thickness must be enlarged.
  • the preferably ribbon-shaped thermal transfer film consists of a Substrate layer, i.e. the carrier film or the carrier tape, from one if possible transparent, heat-resistant plastic and applied one Donor layer, i.e. the heat sensitive transferable layer.
  • a Substrate layer i.e. the carrier film or the carrier tape
  • Donor layer i.e. the heat sensitive transferable layer.
  • Fig. 1 shows schematically a known device for performing an illustration of a printing form by thermal transfer
  • Fig. 1a side view
  • 1b is a perspective view
  • a printing form cylinder 1 On a printing form cylinder 1 is one Printing form 2 as a printing plate or as a sleeve-shaped printing form (es but it would also be conceivable to image the surface of the cylinder itself).
  • Belt transport mechanism 3 On Belt transport mechanism 3 carries a belt-shaped thermal transfer film 4 the width b close to or in contact with the surface of the printing form 2.
  • a known and therefore not shown image information transmission unit comprises a printhead 5 which has at least one laser source includes one or more beams focused on the transfer belt 4.
  • the Laser source 5, preferably an IR laser and the tape transport mechanism 3 are together on a traversing unit 6 in the preferred arrangement arranged, by means of them over the width B of the printing form, which during any control with the cylinder 1 rotates, can be moved.
  • the duration of laser imaging of a printing form is typically 1 to 2 Minutes.
  • Fig. 2 shows schematically a graph of the image data oriented Control of the laser source, with a) the image data stream during imaging (first Step) and b) the image data-oriented control on the surface of the Show printing form (fix, second step).
  • the Image data-oriented control of the surface of the printing form (fixing, second Step) in the reverse order to that which was controlled by the image in the first step Heating of the transfer film can be made. I.e. the print head 5 (Fig. 1) traverses once on the printing form 2 along the width B of the Printing form from left to right.
  • the Print head 5 After removing the transfer film 4 the Print head 5 once from right to left back to the starting position and controls the surface of the printing form in reverse order to the way there. This will optimize the path reached because the "idling" of the print head 5 in the initial position and so a distance B is avoided.
  • both for the first step and the same laser source is used for the second step.
  • the preferred combined training of the laser source as an imaging unit and as However, the fixing device does not preclude the use of different laser sources out.
  • the polymer layer applied to the printing form is by means of the laser source 5 warmed briefly above the Tg temperature (glass transition temperature) of the polymer.
  • the Heating takes place locally and for a limited time. This can cause damage of the "image-free" space are almost excluded. In contrast, can in the case of surface heating / radiation as has been carried out up to now lead to a disturbance in the ink-water balance.
  • the spatial Limitation can be achieved by changing the intensity distribution to reach. Diffractive hybrid elements are ideally suited for this.
  • the second step i.e. the second pictorial controlled heating on the printing form only at a certain Print run.
  • a print run of approximately 5000 is appropriate printing form to be produced only according to the first step of The inventive method reversibly in a conventional manner describe and only with larger print runs (typically between 5000 and 50000) from about 5000 the second step of the invention Procedure.
  • the deletion process that follows the completed printing process Removing the image information from the surface of the printing form can be done in particularly advantageously also by means of a laser source be carried out in an image data oriented manner by performing a power adjustment of the Laser beam is made so that the image information pixel by pixel from the Surface of the printing form can easily be burned away.
  • a laser source is already described in DE 195 03 951 C2 several intensity levels can be switched, i.e. a corresponding Power adjustment, i.e. the radiance per unit area, i.e. the radiance can be set.
  • training the device for one is also Realize thermal transfer such that the print head 5 is a first laser source for imaging the printing form, a second laser source with special adapted intensity distribution for the image data oriented heating of the Surface of the printing form 2 and another laser source with accordingly adjusted radiance to remove image information from the surface the printing form includes as a unit.
  • the method according to the invention is said to be feasible in a printing press be, however, the invention is in no way on the imagewise coating of a Printing form limited within a printing press, but is suitable in principle also for the production of a printing form outside of a printing press.
  • the print image carrier i.e. the printing form a seamless Printing form cylinder, a cylinder sleeve, or also a conventional, uncoated printing plate, which is clamped on a printing cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Electronic Switches (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP00116981A 1999-08-18 2000-08-08 Procédé et dispositif pour la formation réversible d'images sur une forme d'impression Expired - Lifetime EP1077129B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19939240 1999-08-18
DE19939240A DE19939240C2 (de) 1999-08-18 1999-08-18 Verfahren und Vorrichtung zum reversiblen Bebildern einer Druckform

Publications (3)

Publication Number Publication Date
EP1077129A2 true EP1077129A2 (fr) 2001-02-21
EP1077129A3 EP1077129A3 (fr) 2001-03-07
EP1077129B1 EP1077129B1 (fr) 2003-12-03

Family

ID=7918851

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00116981A Expired - Lifetime EP1077129B1 (fr) 1999-08-18 2000-08-08 Procédé et dispositif pour la formation réversible d'images sur une forme d'impression

Country Status (5)

Country Link
US (1) US6424366B1 (fr)
EP (1) EP1077129B1 (fr)
JP (1) JP3323186B2 (fr)
CA (1) CA2316429C (fr)
DE (2) DE19939240C2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10063819B4 (de) * 2000-12-21 2006-02-02 Man Roland Druckmaschinen Ag Maskenerstellung zur Herstellung einer Druckform
DE10121827B4 (de) * 2001-05-04 2005-12-22 Man Roland Druckmaschinen Ag Druckwerk mit reversibler Bebilderung und digitaler Umrüstung
JP4262423B2 (ja) * 2001-07-03 2009-05-13 富士フイルム株式会社 画像記録方法及び画像記録装置
US6610458B2 (en) * 2001-07-23 2003-08-26 Kodak Polychrome Graphics Llc Method and system for direct-to-press imaging
JP2005319782A (ja) * 2004-05-05 2005-11-17 Man Roland Druckmas Ag 刷版を作製する方法および装置
DE102004022087A1 (de) * 2004-05-05 2005-12-01 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zur Herstellung von Druckformen
DE102004051262A1 (de) * 2004-10-21 2006-04-27 Man Roland Druckmaschinen Ag Offsetdruckmaschine
DE102004053832A1 (de) * 2004-11-04 2006-05-11 Man Roland Druckmaschinen Ag Löschbare und regenerierbare Druckform
DE102005028817A1 (de) * 2005-06-22 2007-01-11 Man Roland Druckmaschinen Ag Verfahren zur Herstellung von Druckformen
DE102005046863A1 (de) * 2005-09-30 2007-06-14 Man Roland Druckmaschinen Ag Druckform
DE102006052380B4 (de) * 2006-11-07 2013-04-25 Mühlbauer Ag Vorrichtung und Verfahren zum Einbringen von Informationen in einen Datenträger
DE102007007183A1 (de) * 2007-02-14 2008-08-21 Man Roland Druckmaschinen Ag Verfahren zur Herstellung von Druckformen
US9878531B2 (en) 2013-12-19 2018-01-30 Goss International Americas, Inc. Reimageable and reusable printing sleeve for a variable cutoff printing press

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964389A (en) * 1974-01-17 1976-06-22 Scott Paper Company Printing plate by laser transfer
US5395729A (en) * 1993-04-30 1995-03-07 E. I. Du Pont De Nemours And Company Laser-induced thermal transfer process
WO1998008142A1 (fr) * 1996-08-20 1998-02-26 Minnesota Mining And Manufacturing Company Production d'epreuves en couleur et de planches de tirage

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59201037A (ja) * 1983-04-30 1984-11-14 Canon Inc 可変倍複写装置
DE3809915A1 (de) * 1988-03-24 1989-10-05 Man Technologie Gmbh Verfahren zum uebertragen von druckbildern im flachdruck
US5129321A (en) * 1991-07-08 1992-07-14 Rockwell International Corporation Direct-to-press imaging system for use in lithographic printing
JPH06138793A (ja) * 1992-08-25 1994-05-20 Ricoh Co Ltd 定着装置
JPH0671936A (ja) * 1992-08-26 1994-03-15 Sony Corp プリント装置及びレーザーダイオード駆動装置
DE4426012C2 (de) * 1994-07-22 1998-05-20 Roland Man Druckmasch Löschbare Druckform, ihre Verwendung sowie Verfahren zum Löschen und Regenerieren der Druckform
DE4430555C1 (de) * 1994-08-27 1996-04-04 Roland Man Druckmasch Verfahren und Vorrichtung zur Herstellung einer Druckform
DE19503951C2 (de) * 1995-02-07 1998-04-09 Roland Man Druckmasch Verfahren und Vorrichtung für den Tiefdruck
DE19624441C1 (de) * 1996-06-19 1997-12-04 Roland Man Druckmasch Verfahren und Vorrichtung für den Tiefdruck mittels einer löschbaren Tiefdruckform
EP0838729B1 (fr) * 1996-10-23 2003-05-21 Mitsubishi Chemical Corporation Méthode de copiage électrophotographique et machine électrophotographique utilisée pour cette méthode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964389A (en) * 1974-01-17 1976-06-22 Scott Paper Company Printing plate by laser transfer
US5395729A (en) * 1993-04-30 1995-03-07 E. I. Du Pont De Nemours And Company Laser-induced thermal transfer process
WO1998008142A1 (fr) * 1996-08-20 1998-02-26 Minnesota Mining And Manufacturing Company Production d'epreuves en couleur et de planches de tirage

Also Published As

Publication number Publication date
CA2316429A1 (fr) 2001-02-18
EP1077129A3 (fr) 2001-03-07
DE50004626D1 (de) 2004-01-15
CA2316429C (fr) 2004-05-18
EP1077129B1 (fr) 2003-12-03
DE19939240A1 (de) 2001-03-22
JP3323186B2 (ja) 2002-09-09
DE19939240C2 (de) 2002-09-26
JP2001080025A (ja) 2001-03-27
US6424366B1 (en) 2002-07-23

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