EP0368180B1 - Verfahren zur Bebilderung eines Druckformzylinders - Google Patents

Verfahren zur Bebilderung eines Druckformzylinders Download PDF

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Publication number
EP0368180B1
EP0368180B1 EP89120430A EP89120430A EP0368180B1 EP 0368180 B1 EP0368180 B1 EP 0368180B1 EP 89120430 A EP89120430 A EP 89120430A EP 89120430 A EP89120430 A EP 89120430A EP 0368180 B1 EP0368180 B1 EP 0368180B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
substance
printing form
transfer
form cylinder
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
EP89120430A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0368180A2 (de
EP0368180A3 (en
Inventor
Ingo Köbler
Hartmut Fuhrmann
Josef 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 EP0368180A2 publication Critical patent/EP0368180A2/de
Publication of EP0368180A3 publication Critical patent/EP0368180A3/de
Application granted granted Critical
Publication of EP0368180B1 publication Critical patent/EP0368180B1/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
    • B41C1/1091—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
    • 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
    • B41C1/1075—Mechanical aspects of on-press plate preparation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/70—Forming the printing surface directly on the form cylinder

Definitions

  • the invention relates to a method for imaging a printing form cylinder in a printing press according to the preamble of patent claim 1.
  • an offset printing press which has an electronically controlled pixel transmission unit. This is designed, for example, as a thermal print head and, according to digital image information, removes substance parts from a continuously coated thermal transfer film and places them directly on the printing form cylinder.
  • thermal print head - thermal transfer film - printing form cylinder spacing and contact fluctuations can occur if both the pin electrodes or heating elements of the thermal printing head and the surface of the printing form cylinder are rigid and inelastic.
  • the surface of the printing form cylinder is made of aluminum. Even the smallest deviations in shape of one of the parts involved impair the effective contact pressure and thus the heat transfer, which is reflected in an unevenly transmitted print image or poorly anchored print image elements.
  • a printing form is known from EP 0 264 604 A2, which is also coated by the thermal transfer process. Its surface is also made of aluminum, chrome, a metal oxide such as aluminum oxide, a ceramic material or a plastic. This surface is characterized by a high Print run resistance, but has the disadvantages mentioned above.
  • FR 457 270 From FR 457 270 a method and an apparatus for the production of printing plates are known, which are used in machines for producing prints on rubber or other plastic materials. This machine has two cylinders that are in contact with each other and coated with a rubber layer. However, no device for substance application is provided on the cylinders, especially not by the thermal transfer method.
  • the invention has for its object to provide a method in which the above disadvantages are avoided and even with relatively large manufacturing tolerances of the parts involved in the substance transfer, a uniform transfer is guaranteed.
  • This object is achieved in that the substance is applied, at least in the alternative, to a soft surface of a cylinder of the offset printing press.
  • This feature includes variants on the one hand the direct interaction of the pixel transfer unit with a printing form cylinder that has a soft surface and on the other hand the interposition of another cylinder with a soft surface - for example the blanket cylinder of an offset printing machine - from where in a second Transfer step the transfer to the printing form cylinder takes place.
  • a three-cylinder printing unit of a web-fed offset printing press is shown schematically.
  • a printing material web 3 is passed between a printing cylinder 1 and a blanket cylinder 2 during the printing process.
  • the blanket cylinder 2 serves as a transfer cylinder for a print image generated by the surface of a printing form cylinder 4.
  • the printing form cylinder 4 has an elastomeric surface with a preferably hydrophilic property.
  • Acrylic ester rubber, nitrile rubber or modified polyvinyl chloride (PVC), for example, are suitable as materials for such a surface.
  • a pixel transfer unit 5 which consists of a thermal print head 7 equipped with a plurality of heatable heating elements 6 or pen electrodes, one of which parallel to a surface line of the printing form cylinder 4 leading guide bar 8 and a control unit 9.
  • the control unit 9 is connected via a signal line 10 to the thermal print head 7 which can be moved along the guide bar 8 and via a further signal line 11 to a preferably electronic image memory 12.
  • a thermal transfer film 13 is arranged between the printing form cylinder 4 and the heating elements 6 of the thermal print head.
  • the thermal transfer film 13 is continuously coated on its side facing the printing form cylinder 4 with a substance 14 which is meltable when supplied with energy and solid at room temperature and which preferably has oleophilic properties.
  • a substance 14 which is meltable when supplied with energy and solid at room temperature and which preferably has oleophilic properties.
  • wax or a thermoplastic material are suitable as substance 14.
  • the thermal transfer film 13 is wound on a drum 17 and is used to image the printing form cylinder 4 together with the image transfer unit so far that it touches the surface of the same in one part.
  • a further drum 18 is provided for winding up the part of the thermal transfer film 13 used in the imaging.
  • the control unit 9 To transfer parts 14 a of the substance 14 to the printing form cylinder 4, the control unit 9 first reads image information digitally stored there for each pixel from the image memory 12 and activates one of the heating elements 6 of the thermal printhead depending on whether an image point is to transfer color or not 7.
  • the heating elements 6 placed on the thermal transfer film 13 are acted upon with energy if a pixel is to be color-guiding.
  • the energy can be generated directly as thermal energy in the heating elements or can be released in the case of training as pin electrodes by their interaction with a thermal transfer film formed from several layers of different electrical resistance according to the "resistive ribbon method".
  • the substance parts 14 a melted by the action of energy are deposited on the surface of the printing form cylinder 4 and solidify there very quickly.
  • the fact that the surface of the printing form cylinder 4 is provided with a soft layer means that the manufacturing accuracy of the print head and the guide bar as well as the printing form cylinder are not subject to excessive demands.
  • the substance parts are transferred pixel by pixel line by line, when using several heating elements 6 (or pin electrodes) in several lines in parallel.
  • the feed of the print head 7 and the further rotation of the printing form cylinder 4 after transmission of one (or more image line (s) generated in parallel) are also controlled by the control unit 9.
  • both the printing form cylinder 4 or 15 and the blanket cylinder 2 or 2 'can advantageously be provided with a seamless surface.
  • a print head that extends over the entire width of the printing form cylinder can also be used, which is either formed in one piece or is composed of several parts that are offset with respect to one another in the direction of travel of the transfer film.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Electronic Switches (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rotary Presses (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
EP89120430A 1988-11-09 1989-11-04 Verfahren zur Bebilderung eines Druckformzylinders Expired - Lifetime EP0368180B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837978A DE3837978A1 (de) 1988-11-09 1988-11-09 Verfahren zur bebilderung eines druckformzylinders
DE3837978 1988-11-09

Publications (3)

Publication Number Publication Date
EP0368180A2 EP0368180A2 (de) 1990-05-16
EP0368180A3 EP0368180A3 (en) 1990-11-22
EP0368180B1 true EP0368180B1 (de) 1993-10-20

Family

ID=6366798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89120430A Expired - Lifetime EP0368180B1 (de) 1988-11-09 1989-11-04 Verfahren zur Bebilderung eines Druckformzylinders

Country Status (3)

Country Link
EP (1) EP0368180B1 (enrdf_load_html_response)
JP (1) JP2974699B2 (enrdf_load_html_response)
DE (2) DE3837978A1 (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10121827A1 (de) * 2001-05-04 2002-12-05 Roland Man Druckmasch Druckwerk mit reversibler Bebilderung und digitaler Umrüstung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19811029C2 (de) 1998-03-13 2000-02-24 Roland Man Druckmasch Regelung der Geschwindigkeiten bei einem Verfahren und Vorrichtung zur Herstellung eines Thermotransferdrucks mittels bandförmiger Transferfolien
EP1048458B1 (en) * 1999-04-27 2003-05-14 Agfa-Gevaert Method for making a lithographic printing master
DE19947225A1 (de) * 1999-10-01 2001-04-12 Koenig & Bauer Ag Verfahren zur Behandlung von Druckplatten in Druckmaschinen
DE10030599A1 (de) * 2000-06-21 2002-01-03 Koenig & Bauer Ag Verfahren und Einrichtung in Druckmaschinen zum Aufbringen bebilderbarer Schichten
DE10030601A1 (de) * 2000-06-21 2002-01-03 Koenig & Bauer Ag Verfahren und Einrichtung in Druckmaschinen zum Aufbringen von Bildinformationen tragenden Schichten
DE10153794A1 (de) * 2001-10-31 2003-05-22 Roland Man Druckmasch Verfahren und Vorrichtung zur integrierten Druckformerzeugung in einer Verarbeitungsmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248178C2 (de) * 1982-12-27 1987-02-19 Forschungsgesellschaft Druckmaschinen E.V., 6000 Frankfurt Bildmäßige Beschichtung von Druckformen für den Flachdruck
EP0363842A2 (de) * 1988-10-08 1990-04-18 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Verfahren zur Herstellung von Druckformen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR457270A (fr) * 1913-04-30 1913-09-15 J Voirin Des Ets Procédé et dispositif pour l'obtention directe des planches d'impression utilisées dans les machines à report sur caoutchouc ou autres matières plastiques
NL269626A (enrdf_load_html_response) * 1960-09-28
US3299807A (en) * 1963-10-22 1967-01-24 Minnesota Mining & Mfg Direct imaging of offset plates
DE3636129A1 (de) * 1986-10-23 1988-05-05 Man Technologie Gmbh Druckform fuer den flachdruck
DE3809915A1 (de) * 1988-03-24 1989-10-05 Man Technologie Gmbh Verfahren zum uebertragen von druckbildern im flachdruck

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248178C2 (de) * 1982-12-27 1987-02-19 Forschungsgesellschaft Druckmaschinen E.V., 6000 Frankfurt Bildmäßige Beschichtung von Druckformen für den Flachdruck
EP0363842A2 (de) * 1988-10-08 1990-04-18 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Verfahren zur Herstellung von Druckformen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10121827A1 (de) * 2001-05-04 2002-12-05 Roland Man Druckmasch Druckwerk mit reversibler Bebilderung und digitaler Umrüstung
DE10121827B4 (de) * 2001-05-04 2005-12-22 Man Roland Druckmaschinen Ag Druckwerk mit reversibler Bebilderung und digitaler Umrüstung

Also Published As

Publication number Publication date
EP0368180A2 (de) 1990-05-16
DE3837978A1 (de) 1990-05-10
EP0368180A3 (en) 1990-11-22
DE58905972D1 (de) 1993-11-25
DE3837978C2 (enrdf_load_html_response) 1990-08-16
JPH02172740A (ja) 1990-07-04
JP2974699B2 (ja) 1999-11-10

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