EP1177914A2 - Procédé et appareil pour régénérer une plaque d'impression réutilisable - Google Patents

Procédé et appareil pour régénérer une plaque d'impression réutilisable Download PDF

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Publication number
EP1177914A2
EP1177914A2 EP01118705A EP01118705A EP1177914A2 EP 1177914 A2 EP1177914 A2 EP 1177914A2 EP 01118705 A EP01118705 A EP 01118705A EP 01118705 A EP01118705 A EP 01118705A EP 1177914 A2 EP1177914 A2 EP 1177914A2
Authority
EP
European Patent Office
Prior art keywords
printing form
printing
extinguishing agent
liquid
press
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
EP01118705A
Other languages
German (de)
English (en)
Other versions
EP1177914B1 (fr
EP1177914A3 (fr
Inventor
Martin Gutfleisch
Martin Schmitt-Lewen
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger 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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1177914A2 publication Critical patent/EP1177914A2/fr
Publication of EP1177914A3 publication Critical patent/EP1177914A3/fr
Application granted granted Critical
Publication of EP1177914B1 publication Critical patent/EP1177914B1/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

Definitions

  • the invention relates to a method and a device for deleting a reimageable printing form, which is cleaned in particular of printing ink.
  • Offset printing form are prepared in such a way that they are in a hydrophilic state that is, they accept water or a dampening solution while the printing areas of an offset printing form are in the hydrophobic state that means they do not accept water or dampening solution.
  • dampening the z. B. on one Plate cylinder applied to the printing plate thus only the hydrophilic areas wetted, so that when the printing form is subsequently colored, the greasy printing ink only at the hydrophobic and at the same time lipophilic, i.e. fat-accepting areas the printing form is applied.
  • the print image generated in this way is then from Plate cylinder on a blanket cylinder and from there under pressure on one Print media, e.g. B. paper, cardboard or film transferred.
  • the offset method is thus an indirect printing process.
  • Printing forms are also known which can be illustrated several times. This Printing forms have a surface which, for. B. reversible from the hydrophobic state the hydrophilic state can be transferred.
  • EP 0 911 154 A1 describes such a printing form, the surface of which also Titanium oxide or zinc oxide is coated.
  • the surface properties of this printing form changes under the influence of UV radiation of preferably less than 400 nm wavelength, from the hydrophobic to the hydrophilic state.
  • the printing form can be found under Exposure to heat, e.g. B. mediated by an infrared laser or a heating element arrangement, be put back into the hydrophobic state, which at the same time represents the lipophilic state.
  • the print image is now generated in such a way that the coated printing form, which is originally in the hydrophobic or lipophilic Condition, is fully irradiated with ultraviolet radiation and thus becomes completely hydrophilic.
  • the printing form is local illustrated, that is, becomes locally lipophilic.
  • ink and fountain solution are applied to the Surface of the printing form applied, the ink and fountain solution only on the respective, these accepting offices and thus the printing form for Is ready to print.
  • the printing form is in a washing facility first cleaned of printing ink and by renewed exposure to UV radiation returned to the fully hydrophilic state. The print image is thus deleted from the printing form and this can be a further imaging process be subjected.
  • EP 0 911 155 A1 is also one with titanium oxide or zinc oxide coated printing form known, which like that described in EP 0 911 154 A1 Printing form by using UV radiation in the hydrophilic and by using Heat can be put into the lipophilic state.
  • the printing form described is initially in the lipophilic state and is only local to the non-printing Places exposed to UV radiation to keep these places in the hydrophilic state convict. The printing form is therefore negatively illustrated.
  • the Print form first cleaned of the remaining printing ink and then by Thereby, the entire heat treatment is returned to the lipophilic state, as a result deleted and prepared for another imaging process.
  • the described deletion of the printing form takes a duration of several Minutes, for example about 10 minutes at a temperature of about 150 ° C.
  • This Duration can only be reduced by increasing the temperature. For example, one To reach extinguishing duration of 10 seconds, the temperature must be reached during the Heat treatment can already be increased to 250 ° C.
  • the deletion duration is the temperature tolerance, in particular the Destruction of the oxide layer by the action of heat, on the other hand the Temperature sensitivity of the extinguishing device, which, for example, in the Printing machines can be located, as well as the printing press itself.
  • Printing forms which are used as reproducible printing forms continue to be used after the cleaning process in a coating process with an imageable Surface to be re-coated. It does not become the most relevant in terms of printing technology Surface layer in the molecular area changed and deleted, but one already illustrated layer covered with a layer not yet illustrated.
  • the invention is accordingly based on the object of a method and a device to create with which or with which reimageable printing forms in a short time Time can be deleted.
  • the method according to the invention for deleting a reimageable printing form, which is cleaned of printing ink in particular is characterized by the fact that the Printing form is treated with a liquid or gaseous extinguishing agent.
  • the extinguishing process can advantageously be gaseous extinguishing agent in a very short time be performed.
  • the action of the extinguishing agent on the surface of the printing form which can be a titanium dioxide layer, for example, leads from hydrophilic in the hydrophobic state or from the hydrophobic to the hydrophilic Condition about.
  • the user of the method according to the invention thus becomes enables the deletion of reimageable printing forms in such a short time perform that for example using printing forms in computer-to-press applications the method according to the invention can be deleted.
  • printing forms which from a printing cylinder in a Printing presses were removed outside the printing press in a very short space of time delete the re-images and then back into the printing press use.
  • the Printing form during treatment with the liquid extinguishing agent with ultrasound be treated.
  • the duration of the extinguishing process is advantageous further shortened.
  • the deletion process can take place both in the printing press and in one Ultrasonic bath can be carried out outside the printing press, the liquid Extinguishing agent can form at least part of the immersion bath liquid. After completion Deletion process, the printing form surface is in a hydrophobic state.
  • the printing form during treatment with the liquid extinguishing agent exposed to the influence of a heat source By the action of the heat source the time on the printing form during treatment with the liquid extinguishing agent which is required to delete the printing form, is further shortened in an advantageous manner.
  • the printing form can act on the heat source within the printing press get abandoned.
  • the action of the heat source can also be provided to perform on the printing form outside the printing press.
  • as Heat source at least one infrared laser, at least one heat radiator and / or at least one hot air blower can be used.
  • the Power of the heat source is changeable, setting by hand as well can be done automatically.
  • the printing forme during the treatment with the liquid extinguishing agent Expose normal pressure to increased ambient pressure.
  • the Ambient pressure By increasing the Ambient pressure, the boiling temperature of the liquid extinguishing agent is also increased and it is thus possible to carry out the extinguishing process at a temperature which is higher than the boiling point of the liquid extinguishing agent at normal pressure.
  • the method provides that water is used as a liquid extinguishing agent.
  • a preferred embodiment of the method according to the invention can also be used characterized in that the liquid extinguishing agent using at least one Spray device is applied to the printing form.
  • the Printing form during the treatment with the gaseous extinguishing agent of the action be withdrawn from light, using, for example, oxygen as a gaseous extinguishing agent can be used.
  • Treating the printing form with an oversupply Oxygen in a darkened environment brings the entire printing form back into one uniform hydrophobic state and thus erases itself on the printing form located print image.
  • the deletion process can take place within the printing press, for example be carried out, the area around the printing form cylinder on which the Printing form, is largely darkened, for example by a Partitioning device causes, and with the help of one or more Feed devices, for example in the form of nozzles, the printing form surface cleaner Oxygen is offered.
  • the device according to the invention for deleting a reimageable printing form, which is cleaned of printing ink is characterized by a device for application from liquid or gaseous extinguishing agent onto the printing form.
  • the device for applying extinguishing agent to the printing form can, for example a spray device, in particular one or more spray nozzles, an application roller, a cloud chamber or a device for applying the extinguishing agent electrostatic charge of the extinguishing agent and the printing form.
  • the facility can also be a unit for adjusting the dosage of the extinguishing agent Apply to the printing form.
  • FIG. 1 For brevity, the device according to the invention can Ultrasound source for irradiating the printing form with ultrasound or a heat source Provide for heating the printing form.
  • At least one can be used as the heat source Infrared laser, at least one heat radiator and / or at least one hot air blower be used.
  • the ultrasound source and the heat source can, for example, in the Proximity of the printing form cylinder can be arranged such that they are the device for Applying the extinguishing agent to the printing form in the direction of rotation of the printing form cylinder are subordinate, whereby the ultrasound or heat directly acts on the printing form previously treated with extinguishing agent.
  • Printing processes are also conceivable, which are characterized in that each Rotation of the printing form cylinder deleted the previous image and the printing form anew is illustrated. This is a very quick and effective deletion process necessary, the method and device described above, insofar as they are feasible on-press, can be used.
  • the flow chart shown in FIG. 1 of a method for deleting a reimageable printing form shows a first method step 2, in which the printing form is first cleaned of the printing ink. This cleaning of the printing form can be carried out using a known washing device.
  • a further method step 4 it is determined whether the deletion process should subsequently be carried out in the printing press (on-press) or outside the printing press (off-press). If the extinguishing process is carried out off-press, the printing form is removed from the printing cylinder in a further method step 6 and inserted in an extinguishing device located outside the printing machine in the subsequent method step 8.
  • the printing form can be plate-shaped or cylindrical, the plate-shaped printing form being fastened to the printing form cylinder by a known plate clamping device, while a cylindrical printing form is pushed axially onto the printing form cylinder and pulled off from it.
  • the printing form which has, for example, a titanium dioxide layer on its surface, is now treated in step 10 with a liquid extinguishing agent, the liquid extinguishing agent being able to be applied to the printing form with the aid of an application device, for example a spray device, or wherein the printing form is placed in an immersion bath which at least partially consists of the liquid extinguishing agent. Deleting the printing form with the aid of an immersion bath is preferably used in the off-press embodiment of the method according to the invention.
  • the printing form is reset over its entire surface to a hydrophilic or hydrophobic state, as a result of which all image information on the surface of the printing form is irreversibly erased.
  • Hydrogen peroxide H 2 O 2 for example, can be used to switch the surface layer 36 of the printing form back into the hydrophobic starting state, while the surface layer 36 can be brought into the hydrophilic starting state, for example, with sodium hydroxide solution NaOH.
  • a 30% aqueous solution of H 2 O 2 and a 20% aqueous solution of NaOH can be used.
  • the printing form is additionally treated with ultrasound during the treatment with the liquid extinguishing agent in method step 12.
  • the energy supply mediated by the ultrasound advantageously further supports and shortens the extinguishing process.
  • Ultrasound in the frequency range between 30 kHz and 50 kHz can preferably be used.
  • Process step 14 is the printing form first with water as a liquid extinguishing agent treated.
  • water can be ordinary tap water, but it can also be special treated fire-fighting water, which is subjected to a distillation process, for example was act.
  • the printing form becomes Supports the extinguishing process in addition to the action of a heat source exposed.
  • the supply of thermal energy for example in the form of heat radiation, provides an advantageous support for the deletion process and a further reduction the duration of the deletion process.
  • Another method step 18 includes Increase in the ambient pressure of the printing form compared to the normal pressure of the air during the treatment of the printing form with the liquid extinguishing agent water and the Supply of thermal energy. Due to the above-mentioned increase in ambient pressure, Use of water as a liquid extinguishing agent at temperatures higher than 100 ° C the deletion of the printing form is carried out, and thus the duration of the deletion of the Printing form can be further shortened in an advantageous manner.
  • a tempering of the Printing form 36, or its surface, to a temperature in the range of 50 ° C to 120 ° C proves to be beneficial for supporting the extinguishing agent-induced Deletion.
  • FIG. 3 shows a further flow chart for a method according to the invention, which is shown in process steps 2, 4, 6 and 8 with the process shown in FIGS. 1 and 2 matches.
  • the printing form with oxygen treated as a gaseous extinguishing agent which means that the printing form in a full area hydrophobic state and any image information on the surface the printing form is lost.
  • a further method step 22 Support for the deletion process will continue to be provided during the printing process Treatment with oxygen to avoid exposure to light.
  • Treatment with oxygen to avoid exposure to light.
  • the printing form in a substantially more complete by a partitioning device Darkness can be stored while being exposed to an oxygen bath. By preventing the exposure of light to the surface of the printing form the conversion into the hydrophobic state of the surface favors and time shortened.
  • the embodiment of the device according to the invention shown in FIG. 4 comprises a printing form cylinder 30, a blanket cylinder 32 and one Impression cylinder 34.
  • a print image which is on the surface of a reimageable printing plate 36 is on a blanket 38 of the Transfer rubber cylinder 32 and from there to an image carrier 40, for example Sheets of paper or a sheet of paper which is passed through the nip between the Rubber cylinder 32 and the impression cylinder 34 runs, transferred.
  • the printing form 36 after it was cleaned of printing ink by a washing device, not shown, with a liquid extinguishing agent 42 which is sprayed onto the Surface of the reimageable printing plate 36 is sprayed treated.
  • the liquid extinguishing agent forms a thin film 46 on the surface of the reimageable printing form 36, which is based on the point at which the liquid extinguishing agent 42 is sprayed onto the printing form in the direction of rotation Printing form cylinder 30 extends.
  • the spray device 44 in the direction of rotation Printing form cylinder 30 downstream ultrasound source 48, the printing form 36 with Ultrasound 50 treated.
  • a motor 52 rotates the printing form cylinder with that on it arranged reimageable printing form 36 during the deletion in the by the direction of rotation shown arrow 54.
  • the dosage is controlled by a control unit 56 of the extinguishing agent 42 and the intensity of the ultrasound radiation 50 are controlled. It is for example, the printed image or remnants possible through a sensor unit (not shown) to detect the printed image on the surface of the reimageable printing form 36 and depending on this, the amount of liquid extinguishing agent 42, the application site of the liquid extinguishing agent 42 or the local intensity of the ultrasound radiation 50 for a more efficient deletion of the detected print image or not yet to adjust deleted remnants of the printed image.
  • the control unit 56 also controls the Motor 52 for rotating the printing form cylinder 30 so that a targeted, for example gradual, slow or fast rotation of the printing form cylinder in forward or Reverse direction is made possible.
  • the spray device 44 is an infrared laser 58 downstream in the direction of rotation of the printing form cylinder 30.
  • the one with the liquid Extinguishing agent 42 treated surface of the reimageable printing plate 36 further treated with infrared radiation 60.
  • the infrared laser unit 58 can do this consist of a single infrared laser 58, the laser beam 60 of which is not shown scanning device over the surface of the reimageable Printing form 36 is moved back and forth in the axial direction.
  • an infrared laser unit in the form of a linear, axial Use laser array of multiple infrared lasers, which are near the surface the reimageable printing form 36 parallel to the axis 31 of the printing form cylinder 30 is arranged.
  • the power of the infrared laser 58 can be controlled by the control unit 56 controlled and, for example, continuously during the ongoing deletion process be reduced.
  • FIG. 6 shows a further embodiment of the device according to the invention, in which instead of an infrared laser as shown in Fig. 5, a heat radiator 62 for Sprayer 44 adjacent near the surface of the reimageable Printing form 36 is arranged. Also in this embodiment of the device for Deleting a reimageable printing form is possible using a Control unit 56 the output power of the heat source in the form of a heat radiator 62 to regulate.
  • Fig. 7 shows a device according to the invention, in which for heating the Surface of the reimageable printing plate 36 is adjacent to a hot air blower 64 two spray devices 44 is arranged near the surface of the printing form.
  • the Use of two spray devices 44 allows an extinguishing agent mixture to be applied to apply the surface of the printing form 36, the proportion of a first and a second extinguishing agent in the extinguishing agent mixture by a controlled setting of the Dosage at the spray devices 44 can be effected.
  • a reimageable printing form shows a nozzle 66 which oxygen 68 against the Blows surface of the reimageable printing plate 36.
  • To increase concentration To reach oxygen in the ambient air of the printing plate 36 is the Printing form cylinder 30 by a partition device 70, which the printing form cylinder encloses as gas-tight as possible, surround.
  • the amount of oxygen supplied 68 can be set by the control unit 56, for example not by a Sensor unit shown the oxygen concentration within the Isolation device 70 is determined and compared with a predetermined target value becomes.

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  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
EP01118705A 2000-08-04 2001-08-03 Procédé pour régénérer une plaque d'impression réutilisable Expired - Lifetime EP1177914B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10037998A DE10037998A1 (de) 2000-08-04 2000-08-04 Verfahren und Vorrichtung zum Löschen einer wiederbebilderbaren Druckform
DE10037998 2000-08-04

Publications (3)

Publication Number Publication Date
EP1177914A2 true EP1177914A2 (fr) 2002-02-06
EP1177914A3 EP1177914A3 (fr) 2003-08-20
EP1177914B1 EP1177914B1 (fr) 2005-11-02

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Application Number Title Priority Date Filing Date
EP01118705A Expired - Lifetime EP1177914B1 (fr) 2000-08-04 2001-08-03 Procédé pour régénérer une plaque d'impression réutilisable

Country Status (7)

Country Link
US (1) US20020017209A1 (fr)
EP (1) EP1177914B1 (fr)
JP (1) JP2002103559A (fr)
AT (1) ATE308424T1 (fr)
CA (1) CA2353162C (fr)
DE (2) DE10037998A1 (fr)
IL (1) IL144666A0 (fr)

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EP1834769A2 (fr) * 2006-03-18 2007-09-19 MAN Roland Druckmaschinen AG Machine d'impression de feuilles
EP1700709A3 (fr) * 2005-03-09 2011-01-19 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et appareil pour traitement d'une plaque d'impression réutilisable
US8256347B2 (en) 2005-03-09 2012-09-04 Heidelberger Druckmaschinen Ag Method and apparatus for treating a reimagable printing plate
US9701120B2 (en) 2007-08-20 2017-07-11 R.R. Donnelley & Sons Company Compositions compatible with jet printing and methods therefor
US10022965B2 (en) 2006-02-21 2018-07-17 R.R. Donnelley & Sons Company Method of operating a printing device and an image generation kit

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DE10115435B8 (de) * 2001-03-29 2007-02-08 Maschinenfabrik Wifag Verfahren zur Erzeugung eines Druckbilds und/oder zur Löschung eines Druckbilds einer Nassoffset-Druckform mit fotothermisch veränderbarem Material
DE10143626B4 (de) * 2001-09-06 2005-03-03 Koenig & Bauer Ag Verfahren zur Herstellung einer bebilderten wieder bebilderbaren Druckplatte
EP1346847B1 (fr) * 2002-03-22 2006-09-13 Mitsubishi Heavy Industries, Ltd. Presse à imprimer, dispositif et procédé pour la régénération d'une plaque d'impression
DE10227054B4 (de) * 2002-06-17 2013-01-03 Heidelberger Druckmaschinen Ag Wiederverwendbare Druckform, Druckwerk und Druckmaschine damit sowie Verfahren zur Bebilderung der Druckform
US6851366B2 (en) * 2002-06-17 2005-02-08 Heidelberger Druckmaschinen Ag Reusable printing form
DE10311514B4 (de) * 2003-03-17 2005-10-06 Heidelberger Druckmaschinen Ag Verfahren zum Betreiben eines Offset-Druckwerks und Offset-Druckwerk
DE102004047456A1 (de) * 2004-09-30 2006-08-03 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zum Auftragen eines Mediums auf eine Druckform
EP1986858B1 (fr) 2006-02-21 2010-04-28 Moore Wallace North America, Inc. Systèmes et procédés d'impression variable haute vitesse
US9463643B2 (en) 2006-02-21 2016-10-11 R.R. Donnelley & Sons Company Apparatus and methods for controlling application of a substance to a substrate
US8869698B2 (en) 2007-02-21 2014-10-28 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance
US8881651B2 (en) 2006-02-21 2014-11-11 R.R. Donnelley & Sons Company Printing system, production system and method, and production apparatus
ATE520536T1 (de) 2007-08-20 2011-09-15 Moore Wallace North America Verfahren und vorrichtung für tintenstrahldruck
US7861732B2 (en) * 2007-11-30 2011-01-04 Safety-Kleen Systems, Inc. Immersion cleaner for print rollers
US9564019B2 (en) 2013-11-19 2017-02-07 Gsn Games, Inc. Computerized bingo-type game using bingo symbols drawn from symbol groups
US9542813B2 (en) 2013-11-19 2017-01-10 Gsn Games, Inc. System and method for allowing players to play matching games with card symbols
CN114312049B (zh) * 2021-12-23 2023-12-08 江苏高达新材料有限公司 一种用于纺织物激光打印的防护装置

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US5644986A (en) * 1993-07-09 1997-07-08 Maskinfabriken Tresu A/S Method and apparatus for cleaning a roller surface
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1700709A3 (fr) * 2005-03-09 2011-01-19 Heidelberger Druckmaschinen Aktiengesellschaft Procédé et appareil pour traitement d'une plaque d'impression réutilisable
US8256347B2 (en) 2005-03-09 2012-09-04 Heidelberger Druckmaschinen Ag Method and apparatus for treating a reimagable printing plate
US10022965B2 (en) 2006-02-21 2018-07-17 R.R. Donnelley & Sons Company Method of operating a printing device and an image generation kit
EP1834769A2 (fr) * 2006-03-18 2007-09-19 MAN Roland Druckmaschinen AG Machine d'impression de feuilles
EP1834769A3 (fr) * 2006-03-18 2010-10-20 manroland AG Machine d'impression de feuilles
US9701120B2 (en) 2007-08-20 2017-07-11 R.R. Donnelley & Sons Company Compositions compatible with jet printing and methods therefor

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US20020017209A1 (en) 2002-02-14
IL144666A0 (en) 2002-05-23
ATE308424T1 (de) 2005-11-15
DE10037998A1 (de) 2002-02-14
EP1177914B1 (fr) 2005-11-02
CA2353162C (fr) 2009-06-16
EP1177914A3 (fr) 2003-08-20
CA2353162A1 (fr) 2002-02-04
DE50107888D1 (de) 2005-12-08
JP2002103559A (ja) 2002-04-09

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