EP0520332A1 - Presse à imprimer avec une forme d'impression à supprimer - Google Patents

Presse à imprimer avec une forme d'impression à supprimer Download PDF

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Publication number
EP0520332A1
EP0520332A1 EP92110378A EP92110378A EP0520332A1 EP 0520332 A1 EP0520332 A1 EP 0520332A1 EP 92110378 A EP92110378 A EP 92110378A EP 92110378 A EP92110378 A EP 92110378A EP 0520332 A1 EP0520332 A1 EP 0520332A1
Authority
EP
European Patent Office
Prior art keywords
printing form
printing
printed image
image deposit
deposit
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
EP92110378A
Other languages
German (de)
English (en)
Other versions
EP0520332B1 (fr
Inventor
Asbjorn John Kanck
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 EP0520332A1 publication Critical patent/EP0520332A1/fr
Application granted granted Critical
Publication of EP0520332B1 publication Critical patent/EP0520332B1/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
    • 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
    • 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

Definitions

  • the present invention relates to a method for producing a reusable lithographic printing plate with a printed image deposit, a method for removing the printed image deposit from the printing plate and a printing unit for carrying out the method.
  • This method has some disadvantages, in particular the step of removing the image from the printing form is very complex because it requires the simultaneous use of a suitable solvent and friction. This is a tedious and time consuming process which can also degrade the surface grain of the lithographic printing form and significantly reduce the hydrophilicity of the printing form.
  • the printed image deposit is removed by a heating process which is also known per se, this requires the printing form to be removed from the printing unit and heated in an oven at a suitable temperature for a certain time in order to remove the printed image deposit.
  • a heating process is not suitable for carrying it out within the printing unit because the application of a heating jacket or a similar device is necessary in order to liquefy the print image deposit and to remove it from the printing form.
  • a printing unit is also to be made available for carrying out the method.
  • the figure shows a device that is used to apply a print deposit 2 to the surface of a printing form 1 by melting and then to remove the print deposit from the printing form 1 again.
  • the printing form 1 carries the printed image deposit 2 on its outer surface, while it is itself applied to the outer surface of a rotatable forme cylinder 3.
  • a curved electrode 4, which belongs to a high-frequency induction heater 5, is arranged in the vicinity of the printing form 1, its distance from the printing form 1 can be changed. If energy is supplied to the high-frequency induction heater 5, voltage is also present at the electrode 4.
  • the forme cylinder 3 serves as the counter electrode. If the printing form consists of a metal, the forme cylinder 3 is preferably conductively connected to it.
  • the forme cylinder 3 is preferably at ground potential.
  • the printing form 1 can also consist of a non-conductive material, for example ceramic.
  • the printed image deposit 2 can preferably be sprayed onto the printing form 1 from one nozzle or from a plurality of nozzles, for example arranged side by side.
  • a liquid medium sprayable through the nozzle or nozzles contains volatile components, as will be described below.
  • the melting and the removal of the printed image deposit 2 are independent of the method by which the liquid medium was applied beforehand, and that these methods can also be used in connection with electrostatographic methods for producing a print template.
  • a hydrophobic print image deposit 2 is applied; if it has a hydrophobic surface, a hydrophilic printed image deposit 2 is applied.
  • the electrode 4 of the high-frequency induction heater 5 is in the form of a circular arc and is located at a certain distance from the printing form 1.
  • the frequency and the operating time of the induction heater 5 more or less superficial heating can be achieved of the lithographic printing plate 1 in order to effectively heat the printed image deposit 2 on its surface from the inside out.
  • the print image deposit 2 is melted on the surface of the printing form 1 before it becomes internally coherent. This avoids the formation of bridges within the printed image deposit 2, which could lead to its premature destruction during the printing process.
  • the liquid medium which can be sprayed on from the nozzle or the nozzles to form the printed image precipitate 2 is composed, for example, as follows: Styrene maleic anhydride 12 g ammonia 5 g Bactericide 2 g dye 2 g Diethylene glycol diethyl ether 30 g water 949 g
  • styrene maleic anhydride is the heat-fusible component.
  • Styrene maleic anhydride is soluble in an aqueous alkaline medium.
  • the dye is used only to produce a visually visible print image precipitate 2. It is not necessarily part of the liquid medium.
  • the bactericide and the diethylene glycol diethyl ether are only relevant for the application through the nozzle and are of no importance for the resulting print image deposition 2.
  • the printing form 1 is, for example, an aluminum plate with a granular surface, which is attached to the form cylinder 3.
  • the resulting print image precipitate 2 is now solidified by melting on the surface of the printing form 1 by means of the induction heater 5, the induction heater 5 being able to be operated at variable frequencies in the kHz range.
  • the electrode 4, to which the voltage is applied is, for example, at a distance of 6 mm. Since the electrode 4, for example, does not cover the entire width of the surface of the printing form 1, it is moved parallel to the longitudinal axis of the form cylinder 3, for example at a speed of 0.5 cm / s by a stepping motor 6. At a frequency of 140 kHz, the power is 1.5 kW.
  • the forme cylinder 3 rotates accordingly, so that the electrode 4 passes over the forme cylinder 3 again in the next step parallel to its longitudinal axis in the other direction.
  • the printed image deposit 2 is melted on the entire surface of the printing form 1. If, as shown in the figure, the electrode 4 extends, for example, over a quarter of the circular section of the forme cylinder 3, three further rotations of the forme cylinder 3 by a quarter of its circumference are required in order to deposit the printing forme 1 over its entire surface with a constant print image to provide.
  • the print image deposit 2 is to be removed again.
  • a melting process is carried out again.
  • the distance between the surface of the printing form 1 and the electrode 4 is chosen to be smaller than when the print image precipitate 2 solidifies. In this case it is, for example, 4 mm in order to remove the print image deposit 2 and to prepare the printing form 1 for the next imaging process.
  • the energy supply per unit of time is used to detach the print image precipitate 2 1.6 kW increased while the frequency is 150 kHz.
  • the distances between the electrode 4 when applying and when removing the printed image deposit 2 are chosen to be the same.
  • An electrode in the form of a circular arc is again used as the electrode 4.
  • a flat electrode which has only a slight extension in the circumferential direction of the forme cylinder 3 and extends over the entire length of the lateral surface. It is at a distance of 5 mm from the surface of the printing form 1. With an energy supply of 3 kW per time unit and a frequency of 150 kHz, the printed image deposit 2 is melted. The forme cylinder 3 is rotated at a speed of 1 cm / s when applying and at a speed of 0.5 cm / s when removing the print image precipitate 2. In this case, the stepper motor 6 is not required.
  • the distance between the electrode 4 and the printing form 1 can be adapted accordingly in accordance with the desired depth of invention of the heating from the electrode 4 into the interior of the printing form 1; the frequencies and the energy supply can also be adapted in accordance with the various printing forms 1 that can be used. For example, cleaning of the printing form 1, which in any case requires more energy than the application of the printed image deposit 2 on it, can be carried out at a higher frequency than the application of the printed image deposit 2.
  • the invention can also be used when the printing form 1 is not applied to the form cylinder 3.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
EP92110378A 1991-06-28 1992-06-19 Presse à imprimer avec une forme d'impression à supprimer Expired - Lifetime EP0520332B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU6993/91 1991-06-28
AUPK699391 1991-06-28

Publications (2)

Publication Number Publication Date
EP0520332A1 true EP0520332A1 (fr) 1992-12-30
EP0520332B1 EP0520332B1 (fr) 1996-03-20

Family

ID=3775517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92110378A Expired - Lifetime EP0520332B1 (fr) 1991-06-28 1992-06-19 Presse à imprimer avec une forme d'impression à supprimer

Country Status (4)

Country Link
US (1) US5213041A (fr)
EP (1) EP0520332B1 (fr)
JP (1) JPH05185575A (fr)
DE (1) DE59205729D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6796237B2 (en) 1996-01-24 2004-09-28 Man Roland Druckmaschinen Ag Method for imaging and erasing an erasable printing form

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2700296B1 (fr) * 1993-01-14 1995-02-24 Nipson Procédé d'impression et presse pour la mise en Óoeuvre.
US5816161A (en) * 1994-07-22 1998-10-06 Man Roland Druckmaschinen Ag Erasable printing plate having a smooth pore free metallic surface
EP0724967A1 (fr) * 1995-01-31 1996-08-07 Rockwell International Corporation Assemblage d'impression par contact des caractères effaçables, appareil de reproduction et procédé de reproduction et procédé de production de l'assemblage
US5738013A (en) * 1996-05-14 1998-04-14 New England Science & Specialty Products, Inc. Method of making a lithographic printing plate with an ink jet fluid material
US5811792A (en) * 1997-01-02 1998-09-22 Wisconsin Label Corporation Method and apparatus for accessing contents of envelopes and other similarly concealed information
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
EP0963841B1 (fr) * 1998-06-12 2003-05-28 Agfa-Gevaert Méthode de fabrication de plaques d'impression travaillant en positif à partir d'un latex
IL124981A0 (en) * 1998-06-17 1999-01-26 Scitex Corp Ltd A system and method for offset lithographic printing utilizing a reusable plate
GB9828154D0 (en) * 1998-12-22 1999-02-17 Eastman Kodak Co Surfactants for preparation of printing plates
GB9828153D0 (en) * 1998-12-22 1999-02-17 Eastman Kodak Co Method of preparing a printing plate
WO2001019613A1 (fr) 1999-09-15 2001-03-22 Scitex Corporation Ltd. Systeme d'imprimerie sans plaque
EP1118473B1 (fr) * 2000-01-18 2004-01-28 Agfa-Gevaert Appareil pour le revêtement et le nettoyage automatiques des plaques d'impression lithographique
DE10008213B4 (de) 2000-02-23 2005-12-08 Man Roland Druckmaschinen Ag Einrichtung zur thermischen Energieeinkopplung
JP3422754B2 (ja) * 2000-05-31 2003-06-30 三菱重工業株式会社 印刷用版材の作製方法、再生方法及び印刷機
US6748864B2 (en) 2000-11-14 2004-06-15 Agfa-Gevaert Apparatus for automatic plate coating and cleaning
AU2003273785A1 (en) * 2002-10-28 2004-05-13 Glunz And Jensen A/S Ink composition for ink-jetting upon substrates for a print form, process for producing it, and method of preparing a lithographic print form
DE60306898T2 (de) * 2003-05-14 2007-01-04 Agfa-Gevaert "Computer-zur-Platte " Tintenstrahldruckverfahren
US20050153243A1 (en) * 2004-01-09 2005-07-14 Kodak Polychrome Graphics Llc Ink-jet formation of flexographic printing plates
DE102007007183A1 (de) * 2007-02-14 2008-08-21 Man Roland Druckmaschinen Ag Verfahren zur Herstellung von Druckformen
JP5409153B2 (ja) * 2009-07-16 2014-02-05 旭化成イーマテリアルズ株式会社 印刷原版の製造方法、印刷版の製造方法、印刷原版、及び印刷原版の製造装置
JP6475773B2 (ja) * 2016-06-06 2019-02-27 住友化学株式会社 積層フィルム、マーク付き積層フィルムの製造方法、及び、画像表示装置の製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741118A (en) * 1970-06-17 1973-06-26 A Carley Method for electronic lithography
US3928883A (en) * 1972-10-31 1975-12-30 Joseph J Gregory Apparatus for removal of lithography from metal surfaces
LU73769A1 (fr) * 1975-11-10 1976-09-06
EP0003789A1 (fr) * 1978-02-17 1979-09-05 Hoechst Aktiengesellschaft Procédé de fabrication de plaques d'impression lithographiques
EP0298580A2 (fr) * 1987-07-08 1989-01-11 Dataproducts Corporation Appareil et technique lithographique par transfert par jet d'encre

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153132A (en) * 1960-09-08 1964-10-13 Rockwell Standard Co Induction heating apparatus
JPS6341746B2 (fr) * 1974-09-02 1988-08-18 Risaachi Lab Obu Oosutoraria Pty Ltd
JPS51135709A (en) * 1975-05-19 1976-11-24 Canon Kk Electrostatic printing method
US4718340A (en) * 1982-08-09 1988-01-12 Milliken Research Corporation Printing method
US4527032A (en) * 1982-11-08 1985-07-02 Armco Inc. Radio frequency induction heating device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741118A (en) * 1970-06-17 1973-06-26 A Carley Method for electronic lithography
US3928883A (en) * 1972-10-31 1975-12-30 Joseph J Gregory Apparatus for removal of lithography from metal surfaces
LU73769A1 (fr) * 1975-11-10 1976-09-06
EP0003789A1 (fr) * 1978-02-17 1979-09-05 Hoechst Aktiengesellschaft Procédé de fabrication de plaques d'impression lithographiques
EP0298580A2 (fr) * 1987-07-08 1989-01-11 Dataproducts Corporation Appareil et technique lithographique par transfert par jet d'encre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6796237B2 (en) 1996-01-24 2004-09-28 Man Roland Druckmaschinen Ag Method for imaging and erasing an erasable printing form

Also Published As

Publication number Publication date
EP0520332B1 (fr) 1996-03-20
JPH05185575A (ja) 1993-07-27
DE59205729D1 (de) 1996-04-25
US5213041A (en) 1993-05-25

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