EP1177914B1 - Procédé pour régénérer une plaque d'impression réutilisable - Google Patents

Procédé pour régénérer une plaque d'impression réutilisable Download PDF

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Publication number
EP1177914B1
EP1177914B1 EP01118705A EP01118705A EP1177914B1 EP 1177914 B1 EP1177914 B1 EP 1177914B1 EP 01118705 A EP01118705 A EP 01118705A EP 01118705 A EP01118705 A EP 01118705A EP 1177914 B1 EP1177914 B1 EP 1177914B1
Authority
EP
European Patent Office
Prior art keywords
printing
printing form
extinguishing agent
liquid
printing plate
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
EP01118705A
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German (de)
English (en)
Other versions
EP1177914A2 (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 for deleting a Wegbelogbaren printing form, which in particular is cleaned of printing ink.
  • Printing forms which can be imaged multiple times. These Printing forms have a surface, the z. B. from the hydrophobic state reversible in the hydrophilic state can be transferred.
  • EP 0 911 154 A1 describes such a printing form whose surface is in contact with Titanium oxide or zinc oxide is coated.
  • the surface property 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 under Heat effect, z. B. mediated by an infrared laser or a heating elements 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 originally in the hydrophobic or lipophilic Condition is fully irradiated with ultraviolet radiation and thus is completely hydrophilic.
  • Heat is supplied by means of the heating elements arrangement, whereby the printing form is local imaged, that is locally lipophilic. Thereafter, printing ink and dampening solution on the Surface of the printing form applied, the ink and dampening only on adheres to the respective, these accepting bodies and thus the printing for Printing is prepared.
  • the printing plate is in a washing facility initially cleaned of printing ink and re-exposure to UV radiation again set back in the full-surface hydrophilic state. The print is thus deleted from the printing form and this can be another imaging process be subjected.
  • EP 0 911 155 A1 there is furthermore a likewise with titanium oxide or zinc oxide coated printing form, which is as described in EP 0 911 154 A1
  • Printing form by use of UV radiation in the hydrophilic and by use of Heat can be added to the lipophilic state.
  • the described printing form is initially in the lipophilic state and is only local to the non-printing Make exposure to UV radiation to these sites in the hydrophilic state convict. The printing form is therefore negatively imaged.
  • the First printing form of the remaining ink cleaned and then by Heat treatment fully restored back to the lipophilic state, thereby 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. These Duration can only be reduced by increasing the temperature. For example, a To reach extinguishing duration of 10 seconds, the temperature must be during the Heat treatment already increased to 250 ° C. A gradual reduction of Erase duration is on the one hand the temperature compatibility, in particular the Destruction of the oxide layer by the heat, on the other hand Temperature sensitivity of the extinguishing device, which, for example, in the Printing machines can be located, as well as the printing press itself.
  • the invention is accordingly based on the object, a method to create, with which Contrefork printing forms in a short time Time can be deleted.
  • the method according to the invention for deleting a re-imageable printing form, which is in particular cleaned of printing ink, is characterized in that the Printing form is treated with a liquid or gaseous extinguishing agent.
  • the extinguishing process can advantageously in a very short time be performed.
  • the action of the extinguishing agent on the surface of the printing form which may be, for example, a titanium dioxide layer, this leads, for example, from hydrophilic in the hydrophobic state or from hydrophobic to hydrophilic Condition over.
  • the user of the method according to the invention thus becomes allows the erasure of re-imageable printing forms in such a short time to perform that, for example, printing forms in computer-to-press applications can be deleted by the method according to the invention.
  • printing forms which from a printing cylinder in one Printing presses were removed outside the press in a very short time to clear the Wiederbecularn and then back to the press use.
  • the Printing form during the treatment with the liquid extinguishing agent with ultrasound be treated.
  • the duration of the deletion process in an advantageous manner further shortened.
  • the deletion process can be both in the printing press as well as in a Ultrasonic bath be performed outside the printing machine, the liquid Extinguishing agent can form at least a portion of the dip liquid. After completion Extinguishing process is the printing plate surface in a hydrophobic state.
  • the printing plate during the treatment with the liquid extinguishing agent to be exposed to the action of a heat source.
  • the action of the heat source on the printing form during treatment with the liquid extinguishing agent is the time which is required to erase the printing form, in an advantageous manner further shortened.
  • the printing form of the action of the heat source within the printing press get abandoned.
  • the action of the heat source to perform on the printing form outside the printing press.
  • 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, with manual adjustment as well can be done automatically.
  • Heat is the printing technology relevant outer layer of the printing plate in one holistically hydrophobic state switched back.
  • the printing form during the treatment with the liquid extinguishing agent over the Normal pressure to expose elevated ambient pressure.
  • the boiling point of the liquid extinguishing agent is also increased and it is thus possible to carry out the erasing process at a temperature which is higher than the boiling point of the liquid extinguishing agent at atmospheric pressure. That's the way it works
  • a preferred embodiment of the method according to the invention can continue characterized in that the liquid extinguishing agent using at least one Spraying device is applied to the printing plate.
  • This will be advantageous Make a uniform, areal order of the liquid extinguishing agent on the Printing form achieved, while still a very accurate dosage of extinguishing agent by adjusting the spray nozzles or by adjusting the pressure with which the Extinguishing agent is applied, is made possible.
  • Printing form during treatment with the gaseous extinguishing agent of the action be removed from light, as the gaseous extinguishing agent, for example, oxygen can be used.
  • Treating the printing form with an oversupply Oxygen in a darkened environment leads the entire printing form back into one uniform hydrophobic state and thus deletes one on the printing plate itself located print image.
  • the deletion process can, for example, within the printing press be performed, wherein the area around the printing form cylinder on which the Printing form is located, as far as possible darkened, for example by a Abschottvorraum effected, and whereby with the help of one or more Feeders, for example in the form of nozzles, the printing form surface pure Oxygen is offered.
  • An apparatus for erasing a re-imageable printing form, which is cleaned of ink characterized by a means for applying of liquid or gaseous extinguishing agent on the printing form.
  • the means for applying extinguishing agent to the printing form may, for example a spraying device, in particular one or more spray nozzles, an applicator roll, a mist chamber or means for applying the extinguishing agent be electrostatic charge of the extinguishing agent and the printing form.
  • a unit for adjusting the dosage of the extinguishing agent in Apply to the printing form include.
  • the flowchart of a method for deleting a re-imageable printing form shown in FIG. 1 shows a first method step 2, in which the printing form is first cleaned of the printing ink. This cleaning of the printing plate can be carried out by means of a known washing device.
  • a further method step 4 it is determined whether the deletion process is to be carried out subsequently in the printing press (on-press) or outside the printing press (off-press). If the deletion process is carried out off-press, in a further method step 6, the printing form is removed from the printing cylinder and used in the subsequent method step 8 in an extinguishing device located outside the printing press.
  • the printing plate may be plate-shaped or cylindrical, wherein the plate-shaped printing plate is fixed by a known disk clamping device on the printing form cylinder, while a cylindrical printing form is pushed axially on the printing form cylinder and withdrawn from this.
  • the printing forme which has, for example, a titanium dioxide layer on its surface, is then treated, in method step 10, with a liquid extinguishing agent, wherein the liquid extinguishing agent can be applied to the printing form by means of an applicator, for example a spraying device, or the printing form in a dip, which consists at least partially of the liquid extinguishing agent is introduced.
  • an applicator for example a spraying device
  • the printing form in a dip which consists at least partially of the liquid extinguishing agent is introduced.
  • the deletion of the printing plate by means of a dip bath is preferably used in the off-press embodiment of the method according to the invention.
  • the printing plate By performing in step 10 treatment of the printing plate with a liquid extinguishing agent, the printing plate is set back over the entire surface in a hydrophilic or hydrophobic state depending on the extinguishing agent used, whereby all image information on the surface of the printing plate are irreversibly deleted.
  • a hydrophilic or hydrophobic state depending on the extinguishing agent used, whereby all image information on the surface of the printing plate are irreversibly deleted.
  • hydrogen peroxide H 2 O 2 can be used, while the surface layer 36 can be added, for example, with sodium hydroxide NaOH in the hydrophilic starting state.
  • a 30% aqueous solution of H 2 O 2 and a 20% aqueous solution of NaOH can be used.
  • the printing plate is additionally treated with ultrasound during the treatment with the liquid extinguishing agent.
  • the extinguishing process is advantageously further supported and shortened. It is preferably possible to use ultrasound in the frequency range between 30 kHz and 50 kHz.
  • FIG. 2 shows a further embodiment of the method according to the invention, in which the printing form is treated with water as a liquid extinguishing agent and continues to be exposed to the action of a heat source.
  • Process steps 2, 4, 6 and 8 are equal to the method steps described in FIG. 1.
  • Process step 14 is the printing plate first with water as a liquid extinguishing agent treated. This may be ordinary tap water, but also special treated extinguishing water, which, for example, subjected to a distillation process became, act.
  • the printing for the Support of the extinguishing process additionally the action of a heat source exposed.
  • the supply of heat energy for example in the form of heat radiation, provides advantageous support for the deletion process and further reduction the duration of the deletion process.
  • Another method step 18 includes the Increase of the ambient pressure of the printing plate 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 heat energy.
  • increase in ambient pressure can at Use of water as a liquid extinguishing agent at temperatures higher than 100 ° C the deletion of the printing form are carried out, and thus the duration of the deletion of Printing form can be further shortened in an advantageous manner.
  • a temperature of the Compressor 36, or the surface thereof, to about a temperature in the range of 50 ° C to 120 ° C proves to be favorable in support of the extinguishing agent-induced Deletion.
  • FIG. 3 shows a further flowchart for a method according to the invention, which is described in FIG the process steps 2, 4, 6 and 8 with the method shown in FIGS. 1 and 2 matches.
  • the printing plate with oxygen treated as a gaseous extinguishing agent whereby the printing plate in a full-surface hydrophobic state and any image information on the surface the printing form is lost.
  • the action of light on the surface of the printing plate is the transfer into the hydrophobic state of the surface favors and temporally shortened.
  • the illustrated in Fig. 4 embodiment of the device comprises a printing form cylinder 30, a blanket cylinder 32 and a Impression cylinder 34.
  • a printed image which is on the surface of a reusable printing plate 36 is placed on a blanket 38 of the Transfer blanket cylinder 32 and from there to an image carrier 40, for example a Paper sheet or a paper web, which through the nip between the Rubber cylinder 32 and the impression cylinder 34 is running, transfer.
  • the printing plate 36 To delete the woolbecularbaren printing plate 36 on the plate cylinder 30 in an on-press Embodiment of the device is the printing plate 36, after it was cleaned by an unillustrated washing device of ink, with a liquid extinguishing agent 42, which by means of a spray 44 on the Surface of the householdbecularbaren printing plate 36 is sprayed treated.
  • the Liquid extinguishing agent forms a thin film 46 on the surface of the Wegbecularbaren printing form 36, which, starting from the point at which the liquid extinguishing agent 42 is sprayed onto the printing plate in the direction of rotation of the Printing form cylinder 30 extends.
  • the printed image or remains of the print image on the surface of the reimageable printing plate 36 to detect and depending on the amount of liquid extinguishing agent 42, the point of application of the liquid extinguishing agent 42 or the local intensity of the ultrasonic radiation 50 for a more efficient erase process to the detected image or to the not yet to adjust deleted remnants of the printed image.
  • the control unit 56 further controls the Motor 52 for rotating the plate cylinder 30, so that a targeted, for example gradual, slow or fast rotation of the plate cylinder in forward or Reverse direction is enabled.
  • the spraying device 44 is an infrared laser 58 downstream in the direction of rotation of the plate cylinder 30.
  • the with the liquid Extinguishing agent 42 treated surface of the reimageable printing plate 36 is further treated with infrared radiation 60.
  • the infrared laser unit 58 can in this case consist of a single infrared laser 58, the laser beam 60 by a not shown Abscann worn over the surface of Miberecibaren Printing form 36 is reciprocated in the axial direction.
  • an infrared laser unit in the form of a linear, axial Laser arrangement of several infrared laser use, which is near the surface the Dembercisbaren printing form 36 parallel to the axis 31 of the plate cylinder 30th is arranged.
  • the control unit 56 the power of the infrared laser 58th controlled and continuously, for example, during the progress of the deletion process be reduced.
  • Fig. 6 shows a further embodiment of the device, 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 re-imageable Printing form 36 is arranged. Also in this embodiment of the device for Erasing a reproducible printing form, it is possible by means of a Control unit 56, the output of the heat source in the form of a heat radiator 62nd to regulate.
  • Fig. 7 shows a device in which for heating the Surface of the reimageable printing plate 36 a hot air blower 64 adjacent to two sprayers 44 are disposed near the surface of the printing plate.
  • the Use of two sprayers 44 allows for an extinguishing agent mixture to apply the surface of the printing plate 36, wherein the proportion of a first and a second extinguishing agent in the extinguishing agent mixture by a controlled adjustment of Metering can be effected at the spray 44.
  • the embodiment of the device for erasing shown in FIG a householdbercisbaren printing form shows a nozzle 66, which oxygen 68 against the Surface of householdbercisbaren printing form 36 blows.
  • the Printing form cylinder 30 by a Abschott Anlagen 70 which the printing form cylinder encloses as gas-tight as possible, surrounded.
  • the amount of oxygen 68 supplied may be set by the control unit 56, wherein, for example, by a not shown sensor unit, the oxygen concentration within the Abschott Anlagen 70 is determined and compared with a predetermined setpoint becomes.

Landscapes

  • 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)

Claims (12)

  1. Procédé pour effacer ou régénérer une plaque ou forme d'impression réutilisable ou réinscriptible, qui présente une surface et est débarrassée notamment de l'encre d'impression (2),
    caractérisé en ce que la surface de la forme d'impression est traitée à l'aide d'un agent d'effacement (10, 14, 20) liquide ou gazeux de façon telle, qu'il se produise une transformation de la surface de la forme d'impression de l'état hydrophile à l'état hydrophobe ou de l'état hydrophobe à l'état hydrophile.
  2. Procédé selon la revendication 1, caractérisé en ce que la forme d'impression, pendant le traitement avec l'agent d'effacement liquide (10, 14), est soumise à l'irradiation d'une source à ultrasons ou est traitée par des ultrasons (12).
  3. Procédé selon la revendication 1, caractérisé en ce que la forme d'impression, pendant le traitement avec l'agent d'effacement liquide (10, 14), est soumise à l'action d'une source de chaleur (16).
  4. Procédé selon la revendication 3, caractérisé en ce qu'en guise de source de chaleur, on utilise au moins un laser infrarouge, au moins un dispositif de rayonnement thermique et/ou au moins un ventilateur de soufflage d'air chaud.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que la forme d'impression, pendant le traitement avec l'agent d'effacement liquide (10, 14), est exposée à une pression environnante (18) augmentée par rapport à la pression normale.
  6. Procédé selon l'une des revendications 2 à 5,
    caractérisé en ce que l'agent d'effacement liquide est de l'eau (14).
  7. Procédé selon la revendication 1, caractérisé en ce que l'agent d'effacement liquide est un acide.
  8. Procédé selon la revendication 1, caractérisé en ce que l'agent d'effacement liquide est un bain de lessivage alcalin.
  9. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que l'agent d'effacement liquide est appliqué sur la forme d'impression en utilisant au moins un dispositif de pulvérisation.
  10. Procédé selon la revendication 1, caractérisé en ce que la forme d'impression, pendant le traitement avec l'agent d'effacement gazeux (20), est soustraite à l'action de la lumière (22).
  11. Procédé selon la revendication 10, caractérisé en ce que l'agent d'effacement gazeux et de l'oxygène (20).
  12. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que le procédé est mis en oeuvre dans une machine à imprimer ou dans un dispositif d'effacement ou de régénération à l'extérieur d'une machine à imprimer.
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
DE10037998 2000-08-04
DE10037998A DE10037998A1 (de) 2000-08-04 2000-08-04 Verfahren und Vorrichtung zum Löschen einer wiederbebilderbaren Druckform

Publications (3)

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

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Family Applications (1)

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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US8733248B2 (en) 2006-02-21 2014-05-27 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance and printing system
US8869698B2 (en) 2007-02-21 2014-10-28 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance
US8967044B2 (en) 2006-02-21 2015-03-03 R.R. Donnelley & Sons, Inc. Apparatus for applying gating agents to a substrate and image generation kit
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

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US8733248B2 (en) 2006-02-21 2014-05-27 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance and printing system
US8011300B2 (en) 2006-02-21 2011-09-06 Moore Wallace North America, Inc. Method for high speed variable printing
US8967044B2 (en) 2006-02-21 2015-03-03 R.R. Donnelley & Sons, Inc. Apparatus for applying gating agents to a substrate and image generation kit
US8402891B2 (en) 2006-02-21 2013-03-26 Moore Wallace North America, Inc. Methods for printing a print medium, on a web, or a printed sheet output
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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
US8899151B2 (en) 2006-02-21 2014-12-02 R.R. Donnelley & Sons Company Methods of producing and distributing printed product
US9114654B2 (en) 2006-02-21 2015-08-25 R.R. Donnelley & Sons Company Systems and methods for high speed variable printing
US9505253B2 (en) 2006-02-21 2016-11-29 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance and printing system
US8887633B2 (en) 2006-02-21 2014-11-18 R.R. Donnelley & Sons Company Method of producing a printed sheet output or a printed web of a printing press
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US8887634B2 (en) 2006-02-21 2014-11-18 R.R. Donnelley & Sons Company Methods for printing a printed output of a press and variable printing
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US8136936B2 (en) 2007-08-20 2012-03-20 Moore Wallace North America, Inc. Apparatus and methods for controlling application of a substance to a substrate
US8496326B2 (en) 2007-08-20 2013-07-30 Moore Wallace North America, Inc. Apparatus and methods for controlling application of a substance to a substrate
US8328349B2 (en) 2007-08-20 2012-12-11 Moore Wallace North America, Inc. Compositions compatible with jet printing and methods therefor

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CA2353162C (fr) 2009-06-16
CA2353162A1 (fr) 2002-02-04
DE50107888D1 (de) 2005-12-08
US20020017209A1 (en) 2002-02-14
ATE308424T1 (de) 2005-11-15
DE10037998A1 (de) 2002-02-14
EP1177914A2 (fr) 2002-02-06
IL144666A0 (en) 2002-05-23
EP1177914A3 (fr) 2003-08-20
JP2002103559A (ja) 2002-04-09

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