EP1179425B1 - Method for treating a reusable printing form or cylinder in a printing machine - Google Patents
Method for treating a reusable printing form or cylinder in a printing machine Download PDFInfo
- Publication number
- EP1179425B1 EP1179425B1 EP01115575A EP01115575A EP1179425B1 EP 1179425 B1 EP1179425 B1 EP 1179425B1 EP 01115575 A EP01115575 A EP 01115575A EP 01115575 A EP01115575 A EP 01115575A EP 1179425 B1 EP1179425 B1 EP 1179425B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- laser
- coating
- cylinder
- treating
- 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
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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
-
- 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 treating reimageable printing plates or printing forme cylinders in printing machines, wherein on the surface to be treated a imageable coating is applied.
- the invention further relates to a device for carrying out the method, consisting from an imaging device with a laser, which is assigned to a laser head,
- the regeneration of the printing plate includes the Removal of the imaging on the printing form and hydrophilization of the surface of the Printing form. According to this document, the regeneration takes place in that on the Printing form applied an ionized process gas by means of a loading device with a reactive deletion of the imaging and the simultaneous hydrophilization in a process step is made. The resulting volatile reaction products are removed by a suction device.
- a disadvantage of this regeneration device is the high technical complexity required for the Regeneration of the printing plates must be operated.
- the invention has the advantage that now the process of removing the image information in a much shorter time.
- FIG. 1 shows a printing unit 1 of a multicolour sheet-fed rotary printing press.
- the printing unit 1 contains, as a sheet-guiding cylinder, a printing cylinder 2 and a transfer cylinder 3 and as a print image transferring cylinder a printing form cylinder 4 and a Rubber cylinder 5.
- Each printing form cylinder 4 is assigned an inking unit 6 and a dampening unit 7. On the Printing form cylinder 4 can also be clamped (not shown here printing plate).
- the printing form cylinder 4 is a (not shown) mounted in the frame imaging device 8 assigned.
- This consists of a laser head 12, in which a laser 9 integrated is.
- the power of the laser 9 is controllable. It can be both solid state lasers and Gas discharge laser can be applied.
- the prepared after application of the medium printing form cylinder 4 can now be imaged by the imaging device 8.
- the printing process is completed.
- the artwork will be taken of the printing form cylinder 4 deleted. This is also done by the imaging device 8, which then works as an ablation device and the coating 11 detaches from the surface of the plate cylinder or from the printing plate.
- the intensity of the laser beam of the imaging device 8 increases and thus increased the effect on the surface to be treated.
- the happens according to the invention by increasing the power of the laser 9 by the electrical operating parameters are changed.
- An advantageous embodiment of the invention is the diameter of the laser beam to increase by changing the focus.
- the reliability of the Image resolution can be increased.
- the imaging of the applied coating 11 and the image removal take place with rotating It is advantageous to the printing form cylinder 4 when Imaging Disconnect from the drive and delete.
- the printing forme cylinder has in this case for the Imaging and image removal a separate drive.
- FIG. 2 shows a further exemplary embodiment of the invention.
- the construction of the Printing unit 1 is analogous to the embodiment shown above.
- the imaging device also consists of a laser head 12, which is associated with a laser 9.
- the laser 9 is connected via a light guide cable with a second laser 10.
- several lasers are assigned via fiber optic cable 14.
- the coating and the imaging are carried out analogously to the above-mentioned embodiment.
- To detach the coating is in the laser head 12 via the optical fiber 14th the light of the second laser 10 or further laser supplied and thus the intensity of the Increased effect on the surface to be treated.
- FIG. 2 shows a further exemplary embodiment of the invention.
- the construction of the Printing unit 1 is analogous to the embodiment shown above.
- the imaging device also consists of a laser head 12, which is associated with a laser 9.
- the coating and the imaging are carried out analogously to the above-mentioned embodiment.
- the light beam of the second laser 10 'over the mirror system 13 is supplied to the laser head 12 so that the intensity of the effect is enhanced and the coating can be peeled off within a very short time.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Printing Plates And Materials Therefor (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Processing (AREA)
- Printing Methods (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Behandeln von erneut bebilderbaren Druckformen oder Druckformzylindern in Druckmaschinen, wobei auf die zu behandelnde Oberfläche eine bebilderbare Beschichtung aufgebracht wird.The invention relates to a method for treating reimageable printing plates or printing forme cylinders in printing machines, wherein on the surface to be treated a imageable coating is applied.
Die Erfindung betrifft weiterhin eine Einrichtung zur Durchführung des Verfahrens, bestehend aus einer Bebilderungseinrichtung mit einem Laser, der einem Laserkopf zugeordnet ist,The invention further relates to a device for carrying out the method, consisting from an imaging device with a laser, which is assigned to a laser head,
Aus der Druckschrift DE 195 08 843 A1 ist ein Verfahren zur Bebilderung bzw. zur Bebilderung und Neutralisation einer Druckplatte eines Druckformzylinders einer Druckmaschine bekannt. Hierbei liegen die auf die Druckplatte aufzubringenden Druckbildinformationen in digitaler Form vor. Zur Verwendung der Druckplatte in der Druckmaschine wird ein die Druckbildinformationen tragendes Medium auf die Druckplatte aufgebracht und nach dem Druckprozess abgelöst.From the document DE 195 08 843 A1 is a method for imaging or for imaging and neutralization of a printing plate of a printing forme cylinder of a printing press known. Here are the printed image information to be applied to the printing plate in digital form. To use the printing plate in the printing press is the a Printed image information carrying medium applied to the printing plate and after the Printing process replaced.
Aus der Druckschrift DE 41 23 959 C1 ist ein Verfahren zur Regenerierung einer für den Offsetdruck geeigneten Druckform bekannt. Die Regenerierung der Druckplatte umfasst die Entfernung der Bebilderung auf der Druckform und eine Hydrophilierung der Oberfläche der Druckform. Gemäß dieser Druckschrift erfolgt die Regenerierung dadurch, dass auf die Druckform ein ionisiertes Prozessgas mittels einer Beaufschlagungseinrichtung aufgebracht wird, wobei ein reaktives Löschen der Bebilderung und die gleichzeitige Hydrophilierung in einem Prozessschritt vorgenommen wird. Die dabei entstehenden flüchtigen Reaktionsprodukte werden durch eine Absaugvorrichtung abgeführt.From the document DE 41 23 959 C1 is a method for the regeneration of a for offset printing suitable printing form known. The regeneration of the printing plate includes the Removal of the imaging on the printing form and hydrophilization of the surface of the Printing form. According to this document, the regeneration takes place in that on the Printing form applied an ionized process gas by means of a loading device with a reactive deletion of the imaging and the simultaneous hydrophilization in a process step is made. The resulting volatile reaction products are removed by a suction device.
Nachteilig an dieser Regenerierungseinrichtung ist der hohe technische Aufwand, der für die Regenerierung der Druckplatten betrieben werden muss.A disadvantage of this regeneration device is the high technical complexity required for the Regeneration of the printing plates must be operated.
Aus der US 4,718, 340 ist ein Druckverfahren bekannt, bei dem auf eine Druckplatte oder auf die Oberfläche eines Druckformzylinders eine wasserfreundliche Schicht aufgebracht wird. Diese wiederum wird mit einer farbfreundlichen Schicht belegt. Um das Druckbild zu erzeugen, wird die farbfreundliche Schicht durch einen Ablations-Laser teilweise abgelöst, so dass druckende und nichtdruckende Stellen entstehen.From US 4,718,340 a printing method is known in which on a printing plate or on the surface of a printing forme cylinder is applied a water-friendly layer. This in turn is covered with a color-friendly layer. To create the print image, the color-friendly layer is partially detached by an ablation laser, so that printing and non-printing areas arise.
Um die Druckform zu regenerieren, wird die farbfreundliche, die Bildinformation tragende Schicht, oder beide Schichten entfernt. Das geschieht in einer der gezeigten Varianten mit dem selben Ablations-Laser, der für das Erzeugen der Bildinformation auf der Druckform verwendet wurde.To regenerate the printing form, the color-friendly, the image information bearing Layer, or both layers removed. This happens in one of the variants shown the same ablation laser used to generate the image information on the printing form has been used.
Nachteilig an dieser Lösung ist es, dass die Entfernung des Druckbildes bzw. der Schichten sehr zeitaufwendig ist.A disadvantage of this solution is that the removal of the printed image or the layers very time consuming.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, ein Verfahren und eine Einrichtung zu schaffen, durch welche die die Bildinformation tragende Schicht schnell und sicher von der Oberfläche des Druckzylinders bzw. von der Druckplatte entfernt wird.Based on this prior art, it is an object of the invention to provide a method and to provide a device by which the layer carrying the image information rapidly and safely removed from the surface of the printing cylinder or from the printing plate.
Erfindungsgemäß wird die Aufgabe durch die Merkmale des Anspruchs 1 gelöst.According to the invention the object is achieved by the features of
Die Erfindung hat den Vorteil, dass nunmehr der Vorgang des Entfernens der Bildinformation in einer wesentlich kürzeren Zeit vollzogen werden kann.The invention has the advantage that now the process of removing the image information in a much shorter time.
Anhand eines Ausführungsbeispieles soll die Erfindung nachfolgend näher erläutert werden. Die dazugehörigen Zeichnungen haben folgende Bedeutung:
- Figur 1:
- Schematische Darstellung eines Druckwerkes mit einem Laserkopf zum Übertragen und Löschen der Bildinformation
- Figur 2:
- Schematische Darstellung eines Druckwerkes mit einem Laserkopf zum Übertragen und Löschen der Bildinformation und einem per Lichtleitkabel verbundenen zusätzlichen Laser
- Figur 3:
- Schematische Darstellung eines Druckwerkes mit einem Laserkopf zum Übertragen und Löschen der Bildinformation und einem über ein Spiegelsystem angekoppelten zusätzlichen Laser
- FIG. 1:
- Schematic representation of a printing unit with a laser head for transmitting and erasing the image information
- FIG. 2:
- Schematic representation of a printing unit with a laser head for transmitting and erasing the image information and an additional laser connected by optical cable
- FIG. 3:
- Schematic representation of a printing unit with a laser head for transmitting and erasing the image information and a coupled via a mirror system additional laser
Die Figur 1 zeigt ein Druckwerk 1 einer Mehrfarben - Bogenoffsetrotationsdruckmaschine.
Das Druckwerk 1 enthält als bogenführende Zylinder einen Druckzylinder 2 und einen Übergabezylinder
3 und als druckbildübertragende Zylinder einen Druckformzylinder 4 und einen
Gummizylinder 5. FIG. 1 shows a
Jedem Druckformzylinder 4 ist ein Farbwerk 6 und ein Feuchtwerk 7 zugeordnet. Auf dem
Druckformzylinder 4 kann auch eine (hier nicht dargestellte Druckform) aufgespannt sein.Each
Dem Druckformzylinder 4 ist eine im (nicht dargestellten) Gestell gelagerten Bebilderungseinrichtung
8 zugeordnet. Diese besteht aus einem Laserkopf 12, in dem ein Laser 9 integriert
ist. Die Leistung des Lasers 9 ist steuerbar. Es können sowohl Festkörperlaser als auch
Gasentladungslaser angewendet werden.The
Das erfindungsgemäße Verfahren wird mit dieser Einrichtung wie folgt realisiert:The inventive method is realized with this device as follows:
Bei abgestelltem Druck und abgestelltem Farb- und Feuchtwerk 6; 7 wird durch eine hier
nicht dargestellte Beschichtungseinrichtung ein Medium auf die Oberfläche des Druckformzylinders
4 oder - falls mit einer Druckplatte gearbeitet wird - dieses Medium auf die Oberfläche
der Druckplatte aufgebracht. Dadurch wird eine Beschichtung 11 gebildet. Diese Beschichtung
besteht im Ausführungsbeispiel aus einem Polymer.With the pressure off and the inking and dampening
Der nach dem Aufbringen des Mediums präparierte Druckformzylinder 4 kann nunmehr
durch die Bebilderungseinrichtung 8 bebildert werden.The prepared after application of the medium
Dabei werden in einem nicht dargestellten Rechner Daten für den Druckprozess in allgemein
bekannter Art und Weise aufbereitet und der Bebilderungseinrichtung 8 zugeleitet. Die Rotationsgeschwindigkeit
des Druckformzylinders 4 wird mit der Bewegung der Bebilderungseinrichtung
8 synchronisiert. Im Ergebnis des Bebilderungsprozesses wird die Oberfläche der
Beschichtung 11 mit einer Bildinformation beaufschlagt und an den druckenden Stellen das
Polymer durch den Laserstrahl gehärtet, so dass druckende und nichtdruckende Stellen entstehen.
Die nichtdruckenden Stellen müssen durch eine geeignete Einrichtung von den
nichtpolymerisierten Material befreit werden.In this case, in a computer, not shown, data for the printing process in general
prepared manner known and supplied to the
Nachfolgend wird der Druckprozess vollzogen. Nach dem Druckvorgang wird die Bebilderung
des Druckformzylinders 4 gelöscht. Dies erfolgt ebenfalls durch die Bebilderungseinrichtung
8, wobei diese dann als eine Ablations-Einrichtung arbeitet und die Beschichtung
11 von der Oberfläche des Druckformzylinders oder von der Druckplatte ablöst.Subsequently, the printing process is completed. After printing, the artwork will be taken
of the
Während des Löschvorganges wird die Intensität des Laserstrahles der Bebilderungseinrichtung
8 erhöht und somit die Wirkung auf die zu behandelnde Oberfläche gesteigert. Das
geschieht erfindungsgemäß durch die Vergrößerung der Leistung des Lasers 9, indem die
elektrischen Betriebsparameter geändert werden.During the erasing process, the intensity of the laser beam of the
Eine vorteilhafte Ausführung der Erfindung besteht darin, den Durchmesser des LaserStrahls durch Veränderung des Fokus zu vergrößern. Damit kann die Zuverlässigkeit der Bildablösung vergrößert werden.An advantageous embodiment of the invention is the diameter of the laser beam to increase by changing the focus. Thus the reliability of the Image resolution can be increased.
Die Bebilderung der aufgetragenen Beschichtung 11 und die Bildablösung erfolgen bei rotierendem
Druckformzylinder 4. Dafür ist es vorteilhaft, den Druckformzylinder 4 beim Bebildern
und Löschen vom Antrieb abzukuppeln. Der Druckformzylinder besitzt in diesem Fall für die
Bebilderung und Bildablösung einen eigenen Antrieb.The imaging of the applied
In der Figur 2 ist ein weiteres Ausführungsbeispiel der Erfindung dargestellt. Der Aufbau des
Druckwerkes 1 ist analog zum oben gezeigten Ausführungsbeispiel. Die Bebilderungseinrichtung
besteht ebenfalls aus einem Laserkopf 12, dem ein Laser 9 zugeordnet ist. Der Laser
9 ist über ein Lichtleitkabel mit einem zweiten Laser 10 verbunden. In einer weiteren (hier
nicht dargestellten) Ausführung sind mehrere Laser über Lichtleitkabel 14 zugeordnet.FIG. 2 shows a further exemplary embodiment of the invention. The construction of the
Das erfindungsgemäße Verfahren wird hier wie folgt realisiert:The process according to the invention is realized here as follows:
Die Beschichtung und die Bebilderung erfolgen analog zum oben angeführten Ausführungsbeispiel.
Zum Ablösen der Beschichtung wird in den Laserkopf 12 über das Lichtleitkabel 14
das Licht des zweiten Lasers 10 bzw. weiterer Laser zugeführt und damit die Intensität der
Wirkung auf die zu behandelnde Oberfläche erhöht.The coating and the imaging are carried out analogously to the above-mentioned embodiment.
To detach the coating is in the
In der Figur 2 ist ein weiteres Ausführungsbeispiel der Erfindung dargestellt. Der Aufbau des
Druckwerkes 1 ist analog zum oben gezeigten Ausführungsbeispiel. Die Bebilderungseinrichtung
besteht ebenfalls aus einem Laserkopf 12, dem ein Laser 9 zugeordnet ist. Ein oder
mehrere weitere Laser 10' sind in Nähe des Lasers 9 angeordnet und können bei Bedarf ihre
Energie über ein Spiegelsystem 13 dem Laser 9 zuführen.FIG. 2 shows a further exemplary embodiment of the invention. The construction of the
Das erfindungsgemäße Verfahren wird hier wie folgt realisiert: The process according to the invention is realized here as follows:
Die Beschichtung und die Bebilderung erfolgen analog zum oben angeführten Ausführungsbeispiel.
Zum Ablösen der Beschichtung wird der Lichtstrahl des zweiten Lasers 10' über
das Spiegelsystem 13 dem Laserkopf 12 zugeführt, so dass die Intensität der Wirkung verstärkt
wird und die Beschichtung innerhalb kürzester Zeit abgelöst werden kann. The coating and the imaging are carried out analogously to the above-mentioned embodiment.
To detach the coating, the light beam of the second laser 10 'over
the
- 11
- Druckwerkprinting unit
- 22
- Druckzylinderpressure cylinder
- 33
- ÜbergabezylinderTransfer cylinder
- 44
- DruckformzylinderPlate cylinder
- 55
- Gummizylinderrubber cylinder
- 66
- Farbwerkinking
- 77
- Feuchtwerkdampening
- 88th
- Bebilderungseinrichtungimaging
- 99
- Laserlaser
- 10; 10'10; 10 '
- zweiter Lasersecond laser
- 1111
- Schichtlayer
- 1212
- Laserkopflaser head
- 1313
- Spiegel-SystemMirror System
- 1414
- Lichtleitkabeloptical cable
Claims (5)
- Method of treating printing formes or printing forme cylinders, which can be imaged again, in printing machines, whereina coating (11), which can be imaged, is applied to the surface to be treated,this coating (11) is, for producing an image information, acted on by energy by way of an imaging device (8) equipped with a laser (9),the printing process is initiated with the imaged printing forme andafter printing has taken place the imaging is erased from the printing forme cylinder, whereinthe imaging device (8) is also used for removing the coating (11) in thatduring removal of the coating by the imaging device (8) the intensity of the laser for action on the surface to be treated is increased.
- Method of treating printing formes or printing forme cylinders, which can be imaged again, in printing machines according to claim 1, characterised in that in the imaging by the energy feed into the coating (11) the image-carrying elements are polymerised.
- Method of treating printing formes or printing forme cylinders, which can be imaged again, in printing machines according to claim 1, characterised in that for power amplification of the imaging device (9) during detaching of the coating (11) the power of the laser is increased to the requisite value.
- Method of treating printing formes or printing forme cylinders, which can be imaged again, in printing machines according to claim 1, characterised in that for power amplification of the imaging device (8) during detaching of the coating (11) at least one further laser (10, 10') is switched on.
- Method of treating printing formes or printing forme cylinders, which can be imaged again, in printing machines according to claims 1 to 4, characterised in that the diameter of the laser beam is enlarged during the erasing process.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10039822 | 2000-08-09 | ||
DE10039822A DE10039822A1 (en) | 2000-08-09 | 2000-08-09 | Method and device for treating reimageable printing forms or printing form cylinders in printing machines |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1179425A2 EP1179425A2 (en) | 2002-02-13 |
EP1179425A3 EP1179425A3 (en) | 2003-09-03 |
EP1179425B1 true EP1179425B1 (en) | 2005-08-24 |
Family
ID=7652481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01115575A Expired - Lifetime EP1179425B1 (en) | 2000-08-09 | 2001-06-28 | Method for treating a reusable printing form or cylinder in a printing machine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20020066383A1 (en) |
EP (1) | EP1179425B1 (en) |
AT (1) | ATE302695T1 (en) |
DE (2) | DE10039822A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6820552B2 (en) * | 2001-02-14 | 2004-11-23 | Agfa-Gevaert | Cleaning method for recycling a printing substrate by laser ablation |
DE10217172A1 (en) | 2002-04-18 | 2003-10-30 | Koenig & Bauer Ag | Process for treating reimageable printing forms or printing form cylinders in printing machines |
DE102007005815A1 (en) * | 2007-02-06 | 2008-08-07 | Maschinenfabrik Wifag | Method for illustrating printing plate in offset printing machine, involves applying thermosetting coating material on hydrophobic surface of printing plate, in which coating material is hardened by irradiation or drying process |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3654864A (en) * | 1970-01-16 | 1972-04-11 | Energy Conversion Devices Inc | Printing employing materials with variable volume |
DE4342954C2 (en) * | 1993-12-16 | 1998-01-22 | Roland Man Druckmasch | Method for producing and deleting an erasable high-pressure mold, device for carrying out the method and its use |
IL116885A0 (en) * | 1996-01-24 | 1996-05-14 | Scitex Corp Ltd | An imaging apparatus for exposing a printing member |
DE69805385T2 (en) * | 1997-10-24 | 2002-09-12 | Fuji Photo Film Co., Ltd. | Device for making a printing plate and printer and printing system using this device |
US6072511A (en) * | 1997-12-12 | 2000-06-06 | Presstek, Inc. | Method and apparatus for diode-laser imaging with compensation for output variations |
JP3739962B2 (en) * | 1998-05-18 | 2006-01-25 | 富士写真フイルム株式会社 | Planographic printing plate precursor, lithographic printing plate making method using the same, and lithographic printing plate precursor manufacturing method |
-
2000
- 2000-08-09 DE DE10039822A patent/DE10039822A1/en not_active Withdrawn
-
2001
- 2001-06-28 AT AT01115575T patent/ATE302695T1/en not_active IP Right Cessation
- 2001-06-28 EP EP01115575A patent/EP1179425B1/en not_active Expired - Lifetime
- 2001-06-28 DE DE50107181T patent/DE50107181D1/en not_active Expired - Lifetime
- 2001-08-07 US US09/924,159 patent/US20020066383A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP1179425A2 (en) | 2002-02-13 |
EP1179425A3 (en) | 2003-09-03 |
DE10039822A1 (en) | 2002-02-21 |
US20020066383A1 (en) | 2002-06-06 |
ATE302695T1 (en) | 2005-09-15 |
DE50107181D1 (en) | 2005-09-29 |
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