EP0523584B1 - Process for the regeneration of direct image offset printing forms - Google Patents
Process for the regeneration of direct image offset printing forms Download PDFInfo
- Publication number
- EP0523584B1 EP0523584B1 EP92111869A EP92111869A EP0523584B1 EP 0523584 B1 EP0523584 B1 EP 0523584B1 EP 92111869 A EP92111869 A EP 92111869A EP 92111869 A EP92111869 A EP 92111869A EP 0523584 B1 EP0523584 B1 EP 0523584B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing forme
- printing
- process according
- gas
- reaction chamber
- 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
Links
Images
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
- B41C1/1075—Mechanical aspects of on-press plate preparation
-
- 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
- One way of transferring information to a printing plate or cylinder suitable for offset printing is to transfer electronically stored information, such as texts or images, directly.
- electronically stored information such as texts or images
- organic substances influencing the color guidance are applied to parts of the printing form surface by means of a pixel transfer unit in accordance with digital image information.
- the applied parts of the substance with their oleophilic properties mark the ink-bearing parts of the printed image.
- the previously hydrophilic plate surface is made hydrophobic at the transfer points.
- the application can be carried out, for example, by means of ink-jet, electrostatic or, as proposed in DE-PS 39 17 844 by the same applicant, thermal transfer processes.
- Both a printing plate, preferably anodized, hydrophilized aluminum plate, and a printing cylinder, the outer surface of which has hydrophilic properties, can serve as the printing form.
- Both a pressure cylinder with a cylinder jacket made of ceramic (preferably Al2O3, but also Cr2O3, ZrSiO4 or Al-Mg silicate), as well as a solid ceramic or glass cylinder can be used.
- the object of the invention is to develop a method for the regeneration of such printing forms, the removal of the imaging and the hydrophilization can be carried out without damaging or attacking the surface of the printing form and the method has fewer steps.
- the reactive species (oxygen ions and radicals) formed during the high-frequency excitation of the process gas and the resulting UV radiation are essentially responsible for the chemical reaction on the material surface.
- High-molecular components of the imagewise applied material "crack" by oxidative and / or photolytic attack.
- the resulting volatile reaction products are removed using a suction device. Any physical attack on the printing form surface is avoided.
- the reactive cleaning processes for surfaces include, above all, corona treatment, UV radiation or treatment with a detonating gas flame.
- low-pressure plasma and flame treatment are common methods for improving the adhesive strength of plastic surfaces in particular when painting, printing or coating.
- plasma treatment is used, among other things. successfully used for photoresist stripping and surface cleaning.
- the printing form cylinder to be deleted is preferably moved under the nozzle burner 3 at 20 mm per second.
- the distance between the nozzle burner 3 and the surface of the printing form cylinder 1 is usually 10 to 50 mm.
- the nozzles of the nozzle burner 3 are offset from one another in a row (see FIG. 2).
- the volatile substances formed on the surface of the printing form 1 during the reactive deletion of the substance parts are discharged via a suction device, which is not shown for reasons of clarity and is connected downstream of the application device 2.
- the nozzle burner 3 covers the entire width of the printing form 1.
- a nozzle burner with only one punctiform nozzle opening which is moved axially along the printing form 1 while the printing form 1 passes underneath it rotates and the nozzle burner thus machined the surface of the printing form 1.
- FIG. 3 shows a second example of a reactive method for regeneration of a printing form.
- a printing form cylinder 8 moves under an application device 9 in the manner shown.
- This essentially has a reaction chamber 10 which is arranged over the entire width of the surface of the printing form cylinder 8 in the manner shown and gas lines 11 which on the one hand open into the reaction chamber 10 and on the other hand connect the reaction chamber 10 to a plasma generation chamber 12.
- a high-frequency generator magnet
- gases are introduced into the plasma generation chamber 12 at a pressure of 50 to 200 Pa (0.5 to 2 mbar), preferably 80 to 140 Pa (0.8 to 1.4 mbar).
- Oxygen or an oxygen / CF4 mixture is preferably used as the reaction gas.
- a gas discharge is ignited by applying a high-frequency alternating voltage in the GHz range in the microwave range of preferably 2.45 GHz. This creates the plasma.
- the plasma also contains ions, electrons and uncharged reaction gas molecules.
- UV light is created as a result of recombination processes.
- This plasma is fed via the gas lines 11 to the reaction chamber 10, which is evacuated to about 50 Pa (0.5 mbar) by means of a high vacuum pump 13.
- the surface of the printing form cylinder 8 offers the chemical radicals the opportunity to make new connections.
- the spatial separation of the plasma generator 12 and the reaction chamber 10 is due to the fact that the microwave sealing against a rotating cylinder is problematic. If the plasma generation chamber 12 and reaction chamber 10 are separated, only a static, microwave seal on the remoate chamber 12 is necessary. The seal the reaction chamber 10 against the rotating cylinder need only be a vacuum seal 14.
- the illustrated areas e.g. be pretreated with ultrasound in various solvents or cleaning agents.
- Post-treatment with ultrasound to remove inorganic constituents loosely adhering to the surface after the plasma treatment is also conceivable.
- Aftertreatment of the printing form surface, which can be wetted very well after the plasma treatment, by UV radiation to prevent recontamination of the surface by organic contaminants is also conceivable. It is also possible to support the degradation reaction of the imaging layer initiated by radical attack during the plasma treatment by simultaneous UV irradiation.
Description
Gegenstand der Erfindung ist ein Verfahren zur Regenerierung einer vorzugsweise vorher direkt bebilderten, für den Offsetdruck geeigneten Druckform, das die Entfernung der Bebilderung auf der Druckform und eine Hydrophilierung der Oberfläche der Druckform umfaßt.The invention relates to a process for the regeneration of a printing form, which is preferably previously directly imaged and is suitable for offset printing, which comprises removing the imaging on the printing form and hydrophilizing the surface of the printing form.
Ein derartiges Verfahren ist aus dem Dokument DE-A-3713801 bekannt.Such a method is known from document DE-A-3713801.
Eine Möglichkeit der Informationsübertragung auf eine für den Offsetdruck geeignete Druckplatte oder -zylinder besteht darin, elektronisch gespeicherte Informationen, wie Texte oder auch Bilder, direkt zu übertragen. Es werden beispielsweise auf eine anodisierte Alu-Platte, die eine hydrophile Oberfläche aufweist, bildadäquat die Farbführung beeinflussende organische Substanzen auf Teile der Druckformoberfläche mittels einer Bildpunkt-Übertragungseinheit entsprechend einer Digitalbildinformation aufgetragen. Die aufgebrachten Substanzteile mit ihrer oleophilen Eigenschaft markieren die farbführenden Druckbildteile. Die vorher hydrophile Plattenoberfläche wird an den Übertragungsstellen hydrophobiert. Das Auftragen kann zum Beispiel mittels Ink-Jet-, elektrostatischer oder, wie in der DE-PS 39 17 844 der gleichen Anmelderin vorgeschlagen, Thermotransferverfahren vorgenommen werden. Als Druckform kann dabei sowohl eine Druckplatte, vorzugsweise anodisierte, hydrophilierte Alu-Platte, als auch ein Druckzylinder, dessen äußere Mantelfläche hydrophile Eigenschaften aufweist, dienen. Dabei kann sowohl ein Druckzylinder mit einem Zylindermantel aus Keramik (vorzugsweise Al₂O₃, aber auch Cr₂O₃, ZrSiO₄ oder Al-Mg-Silikat), als auch ein massiver keramischer oder gläserner Zylinder verwendet werden.One way of transferring information to a printing plate or cylinder suitable for offset printing is to transfer electronically stored information, such as texts or images, directly. For example, on an anodized aluminum plate which has a hydrophilic surface, organic substances influencing the color guidance are applied to parts of the printing form surface by means of a pixel transfer unit in accordance with digital image information. The applied parts of the substance with their oleophilic properties mark the ink-bearing parts of the printed image. The previously hydrophilic plate surface is made hydrophobic at the transfer points. The application can be carried out, for example, by means of ink-jet, electrostatic or, as proposed in DE-PS 39 17 844 by the same applicant, thermal transfer processes. Both a printing plate, preferably anodized, hydrophilized aluminum plate, and a printing cylinder, the outer surface of which has hydrophilic properties, can serve as the printing form. Both a pressure cylinder with a cylinder jacket made of ceramic (preferably Al₂O₃, but also Cr₂O₃, ZrSiO₄ or Al-Mg silicate), as well as a solid ceramic or glass cylinder can be used.
Diese direkt bebilderten Druckformen müssen wiederholt verwendbar sein, was bei der Verwendung von Druckzylindern zwingend einleuchtet. Dazu müssen die in der oben beschriebenen Weise bebilderten Druckformen regeneriert werden, d.h. das die druckenden Stellen bildende Material muß entfernt bzw. gelöscht und danach die Druckformoberfläche einer Hydrophilierungsbehandlung unterworfen werden.These directly illustrated printing forms must be able to be used repeatedly, which is evident when using printing cylinders. To do this, you must do so in the manner described above Imaged printing forms are regenerated, ie the material forming the printing areas must be removed or deleted and then the printing form surface must be subjected to a hydrophilization treatment.
Aus der Oberflächentechnik bekannte Reinigungsmethoden haben häufig den Nachteil, daß die Reinigung mehrstufig erfolgt und das Material mechanisch oder abrassiv stark belastet wird. Insbesondere erfordern Aluminiumoberflächen, wenn sie als Druckplatten verwendet werden sollen, anschließend noch eine Hydrophilierungsbehandlung, so daß die Regenerierung mehrere Verfahrensschritte erfordert und somit aufwendig ist.Cleaning methods known from surface technology often have the disadvantage that cleaning takes place in several stages and the material is subjected to high mechanical or abrasive loads. In particular, aluminum surfaces, if they are to be used as printing plates, subsequently require a hydrophilization treatment, so that the regeneration requires several process steps and is therefore complex.
Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Regenerierung solcher Druckformen zu entwickeln, wobei die Entfernung der Bebilderung und die Hydrophilierung ohne Beschädigung oder Angriff der Oberfläche der Druckform durchgeführt werden kann und das Verfahren weniger Schritte aufweist.Based on this prior art, the object of the invention is to develop a method for the regeneration of such printing forms, the removal of the imaging and the hydrophilization can be carried out without damaging or attacking the surface of the printing form and the method has fewer steps.
Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebene Vorgehensweise gelöst.This object is achieved by the procedure specified in the characterizing part of
Dadurch, daß die Druckform mit einem ionisierten Prozeßgas beaufschlagt wird, wird ein reaktiver Löschvorgang eingeleitet, d.h. es findet eine chemische Reaktion auf der Materialoberfläche statt, wobei die zu entfernenden organischen Substanzteile im wesentlichen in flüchtige Reaktionsprodukte wie H₂O und gasartiges CO₂ umgewandelt werden, so daß die Oberfläche gelöscht wird. In einem Prozeßschritt mit dem Löschen findet zugleich die Regeneration, d.h. die Hydrophilierung der Druckform statt, die auf die Ausbildung polarer Gruppen an der Druckformoberfläche (Oxidation durch das Prozeßgas) und auf die Adsorption des beim Löschvorgang gebildeten H₂O an der Druckformoberfläche zurückzuführen ist.The fact that the printing form is charged with an ionized process gas, a reactive quenching process is initiated, ie there is a chemical reaction on the material surface, the organic substance parts to be removed are essentially converted into volatile reaction products such as H₂O and gaseous CO₂, so that the surface is deleted. In a process step with the extinguishing takes place at the same time the regeneration, ie the hydrophilization of the printing form, which is due to the formation of polar groups on the printing form surface (oxidation by the process gas) and to the adsorption of the H₂O formed during the deletion process on the printing form surface.
Auf diesem Wege können beträchtliche Mengen an Säuren oder Lösungsmittel eingespart werden. Für die chemische Reaktion an der Materialoberfläche sind im wesentlichen die bei der Hochfrequenzanregung des Prozeßgases gebildeten reaktiven Spezies (Sauerstoffionen und -radikale) und die entstehende UV-Strahlung verantwortlich, die die organischen, z.T. hochmolekularen, Bestandteile des bildmäßig aufgebrachten Materials durch oxidativen und/oder photolythischen Angriff "cracken". Die dabei entstehenden flüchtigen Reaktionsprodukte werden mittels einer Absaugvorrichtung entfernt. Dabei wird jeglicher physikalische Angriff der Druckformoberfläche vermieden. Als reaktive Reinigungsverfahren für Oberflächen sind neben der Niederdruckplasmabehandlung vor allem die Korona-Behandlung, die UV-Bestrahlung oder die Behandlung mit einer Knallgasflamme zu nennen. In der Praxis (Automobil- und Verpackungsindustrie) sind die Niederdruckplasma- und die Flammenbehandlung gängige Verfahren zur Verbesserung der Haftfestigkeit von insbesondere Kunststoffoberflächen beim Lackieren, Bedrucken oder, Beschichten. In der Halbleitertechnologie wird die Plasmabehandlung u.a. erfolgreich zum Photolackstrippen und zur Oberflächenreinigung eingesetzt.In this way, considerable amounts of acids or solvents can be saved. The reactive species (oxygen ions and radicals) formed during the high-frequency excitation of the process gas and the resulting UV radiation are essentially responsible for the chemical reaction on the material surface. High-molecular components of the imagewise applied material "crack" by oxidative and / or photolytic attack. The resulting volatile reaction products are removed using a suction device. Any physical attack on the printing form surface is avoided. In addition to low-pressure plasma treatment, the reactive cleaning processes for surfaces include, above all, corona treatment, UV radiation or treatment with a detonating gas flame. In practice (automotive and packaging industry), low-pressure plasma and flame treatment are common methods for improving the adhesive strength of plastic surfaces in particular when painting, printing or coating. In semiconductor technology, plasma treatment is used, among other things. successfully used for photoresist stripping and surface cleaning.
Nachstehend sind zwei Ausführungsbeispiele für die Erfindung anhand der Zeichnung erklärt. Es zeigt stark schematisiert
- Fig. 1
- die Beaufschlagungsvorrichtung für eine Brenngasbehandlung der Oberfläche eines Druckformzylinders;
- Fig. 2
- eine Detailansicht der Beaufschlagungsvorrichtung gemäß Fig. 1;
- Fig. 3
- die Beaufschlagungsvorrichtung für eine Niederdruckplasmabehandlung der Oberfläche eines Druckformzylinders.
- Fig. 1
- the application device for a fuel gas treatment of the surface of a printing form cylinder;
- Fig. 2
- a detailed view of the loading device according to FIG. 1;
- Fig. 3
- the application device for a low-pressure plasma treatment of the surface of a printing form cylinder.
In Fig. 1 ist mit 1 ein Druckformzylinder und mit 2 eine Beaufschlagungsvorrichtung, die im wesentlichen einen sich über die gesamte Breite des Druckformzylinders 1 erstreckenden Düsenbrenner 3 und mit diesem verbundene Gaszuleitungen 4, 5 aufweist. Der Druckformzylinder 1 bewegt sich unter der Beaufschlagungsvorrichtung 2 hinweg. Wasserstoff und Sauerstoff werden mittels der Gaszuleitung 4, 5 über das gemeinsame Leitungsendstück 6 zum Düsenbrenner 3 geführt, wo sie verbrennen. Dabei werden die organischen Bestandsteile der Bebilderung abgebrannt und es entstehen im wesentlichen CO₂ und Wasser als Reaktionsprodukte. Das Wasser leistet die Hydrophilierung der Oberfläche der Druckform. Die thermische Belastung der Druckform ist gering.In Fig. 1, 1 is a printing form cylinder and 2 is an application device which essentially has a
Als besonders geeignet hat sich dabei eine sauerstoffreiche Sauerstoff-Wasserstoff-Flamme erwiesen. Der zu löschende Druckformzylinder wird vorzugsweise mit 20 mm pro Sekunde unter dem Düsenbrenner 3 hindurchbewegt. Der Abstand des Düsenbrenners 3 zur Oberfläche des Druckformzylinders 1 beträgt üblicherweise 10 bis 50 mm. Um eine möglichst gleichmäßige Löschung zu erzielen, sind die Düsen des Düsenbrenners 3 zeilenförmig gegeneinander versetzt (siehe Fig. 2).An oxygen-rich oxygen-hydrogen flame has proven to be particularly suitable. The printing form cylinder to be deleted is preferably moved under the
Die beim reaktiven Löschen der Substanzteile auf der Oberfläche der Druckform 1 entstehenden flüchtigen Stoffe werden über eine aus Übersichtlichkeitsfründen nicht dargestellte, der Beaufschlagungsvorrichtung 2 nachgeschalteten Absaugvorrichtung abgeführt.The volatile substances formed on the surface of the
Im Ausführungsbeispiel überdeckt der Düsenbrenner 3 die gesamte Breite der Druckform 1. Im Rahmen der Erfindung ist es jedoch auch denkbar, einen Düsenbrenner mit nur einer punktförmigen Düsenöffnung zu verwenden, der axial entlang der Druckform 1 bewegt wird, während die Druckform 1 sich unter ihm hindurch dreht und der Düsenbrenner somit die Oberfläche der Druckform 1 wendelförmig bearbeitet.In the exemplary embodiment, the
Ein zweites Beispiel für ein reaktives Verfahren zur Regeneration einer Druckform zeigt Fig. 3. Ein Druckformzylinder 8 bewegt sich in der dargestellten Weise unter einer Beaufschlagungsvorrichtung 9 hinweg. Diese weist im wesentlichen eine Reaktionskammer 10, die über die gesamte Breite der Oberfläche des Druckformzylinders 8 in der dargestellten Weise angeordnet ist und Gasleitungen 11 die einerseits in die Reaktionskammer 10 münden, andererseits die Reaktionskammer 10 mit einer Plasmaerzeugungskammer 12 verbinden, auf. In der Plasmaerzeugungs (Remoat) -Kammer befindet sich ein Hochfrequenzgenerator (Magnetron) der mit einer Leistung bis zu 600 W belastet werden kann. In die Plasmaerzeugungskammer 12 werden bei einem Druck von 50 bis 200 Pa (0,5 bis 2 mbar), vorzugsweise 80 bis 140 Pa (0,8 bis 1,4 mbar), Gase eingeleitet. Als Reaktionsgas wird vorzugsweise Sauerstoff oder ein Sauerstoff/CF₄-Gemisch verwendet. Durch Anlegen einer hochfrequenten Wechselspannung im GHz-Bereich im Mikrowellenbereich von vorzugsweise 2,45 GHz wird eine Gasentladung gezündet. Dabei entsteht das Plasma. Im Plasma sind neben Radikalen noch Ionen, Elektronen und ungeladene Reaktionsgasmoleküle enthalten. Ferner entsteht als Ergebnis von Rekombinationsprozessen UV-Licht. Dieses Plasma wird über die Gasleitungen 11 der Reaktionskammer 10, die mittels einer Hochvakuumpumpe 13 auf etwa 50 Pa (0,5 mbar) evakuiert wird, zugeführt. Hier bietet die Oberfläche des Druckformzylinders 8 den chemischen Radikalen die Möglichkeit, neue Verbindungen einzugehen. Dabei werden zum einen Sauerstoffspezies unmittelbar an der Oberfläche gebunden, es entstehen polare Oberflächengruppen, wodurch sich die Oberflächenenergie des Druckformzylinders 8 erhöht, seine Oberfläche wird hydrophil. Zum anderen reagieren die chemischen Radikale mit dem bildmäßig aufgebrachten, organischem Material. Die dabei entstehenden flüchtigen Verbindungen werden durch die Vakuumpumpe 13 abgesaugt.FIG. 3 shows a second example of a reactive method for regeneration of a printing form. A
Die räumliche Trennung des Plasmaerzeugers 12 und der Reaktionskammer 10 hat ihre Ursache darin, daß die Mirkrowellenabdichtung gegen einen rotierenden Zylinder problematisch ist. Trennt man Plasmaerzeugungskammer 12 und Reaktionskammer 10, so ist nur eine, statische, Mikrowellenabdichtung an der Remoat-Kammer 12 nötig. Die Abdichtung der Reaktionskammer 10 gegen den rotierenden Zylinder muß nur eine Vakuumdichtung 14 sein.The spatial separation of the
Der besondere Vorteil der sogenannten Niederdruckplasmabehandlung ist darin zu sehen, daß die Reaktionen in einem Temperaturbereich von etwa 30°C bis 100°C ablaufen können, die bei Atmosphärendruck erst bei mehreren 100°C möglich sind. Somit werden schädliche Temperaturen an der Oberfläche der Druckform 8 von vornherein vermieden.The particular advantage of the so-called low-pressure plasma treatment can be seen in the fact that the reactions can take place in a temperature range of about 30 ° C to 100 ° C, which are only possible at several 100 ° C at atmospheric pressure. Harmful temperatures on the surface of the
Die erforderliche Vakuumabdichtung 14 der Reaktionskammer 10 gegen den Druckformzylinder 8 geschieht in der aus der Dichttechnik von Drehdurchführungen bekannten Weise in Form von Gleitdichtungen oder durch den Einsatz von Ferrofluiden, die in den Spalt zwischen dem Gehäuse der Reaktionskammer 10 und des Druckformzylinders 8 eingesetzt werden.The required vacuum seal 14 of the
Zur Unterstützung der Niederdruckplasmabehandlung können die bebilderten Stellen, z.B. mit Ultraschall in verschiedenen Lösungs- oder Reinigungsmitteln vorbehandelt werden. Auch eine Nachbehandlung mit Ultraschall zur Entfernung von nach der Plasmabehandlung lose an der Oberfläche haftenden anorganischen Bestandteilen ist denkbar. Des weiteren ist eine Nachbehandlung der nach der Plasmabehandlung sehr gut benetzbaren Druckformoberfläche durch UV-Bestrahlung zur Verhinderung der Rekontamination der Oberfläche durch organische Verunreinigungen denkbar. Auch eine Unterstützung der durch radikalischen Angriff iniziierten Abbaureaktion der Bebilderungsschicht bei der Plasmabehandlung durch gleichzeitige UV-Bestrahlung ist möglich.To support the low pressure plasma treatment, the illustrated areas, e.g. be pretreated with ultrasound in various solvents or cleaning agents. Post-treatment with ultrasound to remove inorganic constituents loosely adhering to the surface after the plasma treatment is also conceivable. Aftertreatment of the printing form surface, which can be wetted very well after the plasma treatment, by UV radiation to prevent recontamination of the surface by organic contaminants is also conceivable. It is also possible to support the degradation reaction of the imaging layer initiated by radical attack during the plasma treatment by simultaneous UV irradiation.
Stellt man die möglichen reaktiven Oberflächenbehandlungen einer Druckform, bei denen ein Reaktionsgas verwendet wird der Niederdruckplasmabehandlung gegenüber, so zeigt sich, daß zwar alle in der Wirkungsweise sich sehr ähneln, jedoch liegt die Effektivität der Reaktion bei der Niederdruckplasmabehandlung höher. Der Grund dafür ist mit der höheren Lebensdauer der aktiven Teilchen bei vermindertem Druck zu erklären. Des weiteren zeichnet sich insbesondere die Plasmabehandlung mit einem durch Mikrowellen angeregten Plasma durch besondere Effektivität aus, da die Konzentration der reaktiven Spezies in einem mittels Mikrowellen angeregtem Plasma höher ist als in niederfrequenter angeregten Plasmen.If one compares the possible reactive surface treatments of a printing form, in which a reaction gas is used, with the low-pressure plasma treatment, it can be seen that although all of the effects are very similar, the effectiveness of the reaction in the low-pressure plasma treatment is higher. The reason for this is due to the longer life of the active particles to explain reduced pressure. Furthermore, plasma treatment with a plasma excited by microwaves is particularly effective because the concentration of the reactive species in a plasma excited by microwaves is higher than in low-frequency excited plasmas.
Claims (7)
- Process for the repeated reversible regeneration of preferably previously directly imaged printing formes suitable for offset printing, which includes the removal of the imaging on the printing forme and hydrophilising of the surface of the printing forme, characterised in that an ionised process gas is applied by means of an impact device (2, 9) onto the printing forme (1, 8), a reactive deletion of the image and the simultaneous hydrophilising being carried out in one process step and the resultant volatile reaction products being conveyed away by means of a suction device (13).
- Process according to claim 1, characterised in that combustion gas is used as the process gas, the printing forme (1) being acted on over the entire width by means of a nozzle burner (3), whilst the printing forme (1) moves through under the nozzle burner (3).
- Process according to claim 2, characterised in that an oxygen-rich oxygen/hydrogen mixture is preferably used as combustion gas, and a printing forme cylinder (1) is moved through under the nozzle burner (3) preferably at a speed of 20 mm per second, the distance of the nozzle burner (3) from the surface of the printing forme (1) preferably being 10 to 50 mm.
- Process according to claim 1, characterised in that plasma is used as the process gas and is conveyed to the printing forme (8) by means of an evacuated reaction chamber (10) which extends over the entire width of the printing forme (8) and is sealed by means of a vacuum seal (14) against the printing forme (8).
- Process according to claim 4, characterised in that the plasma is produced in a plasma generator (12) locally separated from the reaction chamber (10), preferably by means of a high-frequency alternating current voltage in the GHz range, and is conveyed via gas lines (11) to the reaction chamber (10).
- Process according to claim 4, characterised in that oxygen or an oxygen/CF₄ gas mixture is preferably used for plasma production.
- Process according to claim 4, characterised in that the reaction chamber (10) is evacuated by means of a high-vacuum pump (13) to a pressure of preferably 50 Pa (0.5 mbar).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4123959 | 1991-07-19 | ||
| DE4123959A DE4123959C1 (en) | 1991-07-19 | 1991-07-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0523584A1 EP0523584A1 (en) | 1993-01-20 |
| EP0523584B1 true EP0523584B1 (en) | 1995-08-23 |
Family
ID=6436542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92111869A Expired - Lifetime EP0523584B1 (en) | 1991-07-19 | 1992-07-13 | Process for the regeneration of direct image offset printing forms |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5317970A (en) |
| EP (1) | EP0523584B1 (en) |
| JP (1) | JP3217464B2 (en) |
| CA (1) | CA2071773C (en) |
| DE (2) | DE4123959C1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7746088B2 (en) | 2005-04-29 | 2010-06-29 | Applied Materials, Inc. | In-line electron beam test system |
| US7786742B2 (en) | 2006-05-31 | 2010-08-31 | Applied Materials, Inc. | Prober for electronic device testing on large area substrates |
| US7847566B2 (en) | 2004-02-12 | 2010-12-07 | Applied Materials, Inc. | Configurable prober for TFT LCD array test |
| US7919972B2 (en) | 2004-02-12 | 2011-04-05 | Applied Materials, Inc. | Integrated substrate transfer module |
| US8208114B2 (en) | 2002-06-19 | 2012-06-26 | Akt Electron Beam Technology Gmbh | Drive apparatus with improved testing properties |
Families Citing this family (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6006666A (en) * | 1992-05-20 | 1999-12-28 | Man Roland Druckmaschinen Ag | Method and apparatus for erasing the ink-carrying layer from the surface of an image-containing printing form |
| DE4216636C2 (en) * | 1992-05-20 | 1995-11-23 | Roland Man Druckmasch | Process and device for erasing and hydrophilizing a printing form imaged by means of a thermal transfer process |
| FR2700296B1 (en) * | 1993-01-14 | 1995-02-24 | Nipson | Printing process and press for implementation. |
| US5816161A (en) * | 1994-07-22 | 1998-10-06 | Man Roland Druckmaschinen Ag | Erasable printing plate having a smooth pore free metallic surface |
| DE4426012C2 (en) | 1994-07-22 | 1998-05-20 | Roland Man Druckmasch | Erasable printing form, its use and methods for erasing and regenerating the printing form |
| US5839369A (en) * | 1995-10-20 | 1998-11-24 | Eastman Kodak Company | Method of controlled laser imaging of zirconia alloy ceramic lithographic member to provide localized melting in exposed areas |
| US5836249A (en) * | 1995-10-20 | 1998-11-17 | Eastman Kodak Company | Laser ablation imaging of zirconia-alumina composite ceramic printing member |
| US5855173A (en) * | 1995-10-20 | 1999-01-05 | Eastman Kodak Company | Zirconia alloy cylinders and sleeves for imaging and lithographic printing methods |
| US5839370A (en) * | 1995-10-20 | 1998-11-24 | Eastman Kodak Company | Flexible zirconia alloy ceramic lithographic printing tape and method of using same |
| US5743188A (en) * | 1995-10-20 | 1998-04-28 | Eastman Kodak Company | Method of imaging a zirconia ceramic surface to produce a lithographic printing plate |
| US5870956A (en) * | 1995-12-21 | 1999-02-16 | Eastman Kodak Company | Zirconia ceramic lithographic printing plate |
| DE19600844A1 (en) * | 1996-01-12 | 1997-07-17 | Heidelberger Druckmasch Ag | Cleaning device for directly produced printing formes |
| DE19600846C1 (en) * | 1996-01-12 | 1997-04-03 | Heidelberger Druckmasch Ag | Cleaning device for laser image printing plate |
| DE19602328A1 (en) * | 1996-01-24 | 1997-07-31 | Roland Man Druckmasch | Process for imaging an erasable printing form |
| US5893328A (en) * | 1997-05-01 | 1999-04-13 | Eastman Kodak Company | Method of controlled laser imaging of zirconia-alumina composite ceramic lithographic printing member to provide localized melting in exposed areas |
| US5836248A (en) * | 1997-05-01 | 1998-11-17 | Eastman Kodak Company | Zirconia-alumina composite ceramic lithographic printing member |
| US5927207A (en) * | 1998-04-07 | 1999-07-27 | Eastman Kodak Company | Zirconia ceramic imaging member with hydrophilic surface layer and methods of use |
| DE19826377A1 (en) * | 1998-06-12 | 1999-12-16 | Heidelberger Druckmasch Ag | Printing press and printing process |
| DE19932071A1 (en) * | 1998-07-22 | 2000-01-27 | Heidelberger Druckmasch Ag | Simple and robust imaging head preparing surface of offset printing plate, has fine matrix of insulated pins selectively connected to HF power source |
| DE69913518T2 (en) * | 1999-08-31 | 2004-11-11 | Agfa-Gevaert | Process for renewing a planographic printing plate |
| US6408755B1 (en) | 1999-08-31 | 2002-06-25 | Agfa-Gavaert | Method for erasing a lithographic printing master |
| DE10037998A1 (en) * | 2000-08-04 | 2002-02-14 | Heidelberger Druckmasch Ag | Method and device for deleting a reimageable printing form |
| DE10039818A1 (en) * | 2000-08-09 | 2002-02-21 | Koenig & Bauer Ag | Process for producing a printing press |
| DE10115435B8 (en) * | 2001-03-29 | 2007-02-08 | Maschinenfabrik Wifag | Method for producing a printed image and / or deleting a printed image of a wet offset printing form with photothermally changeable material |
| DE10132204A1 (en) * | 2001-07-03 | 2003-01-30 | Oce Printing Systems Gmbh | Production of different printed images with the same print substrate using a printer with an integral cleaning device so that the same print substrate can be used for different images without renewal or removal |
| US6610458B2 (en) | 2001-07-23 | 2003-08-26 | Kodak Polychrome Graphics Llc | Method and system for direct-to-press imaging |
| US20040135828A1 (en) * | 2003-01-15 | 2004-07-15 | Schmitt Stephen E. | Printer and method for printing an item with a high durability and/or resolution image |
| US6981767B2 (en) * | 2003-01-15 | 2006-01-03 | Ssgii, Inc. | Printed item having an image with a high durability and/or resolution |
| WO2004080721A1 (en) * | 2003-03-13 | 2004-09-23 | Ajinomoto Co., Inc. | Image erasing method, apparatus therefor and recycling method for recording medium |
| US20050229800A1 (en) * | 2004-04-20 | 2005-10-20 | Heidelberger Druckmaschinen Ag | Plate cylinder with larger diameter central image area |
| DE102005028817A1 (en) * | 2005-06-22 | 2007-01-11 | Man Roland Druckmaschinen Ag | Process for the production of printing plates |
| TW200814170A (en) * | 2006-09-13 | 2008-03-16 | Ind Tech Res Inst | Method of adjusting surface characteristic of a substrate |
| US20080136887A1 (en) * | 2006-12-11 | 2008-06-12 | Schmitt Stephen E | Printed item having an image with a high durability and/or resolution |
| DE102007024611A1 (en) * | 2007-05-25 | 2008-11-27 | Manroland Ag | Method and device for producing a permanent and erasable image on a printing form |
| DE102010013100A1 (en) * | 2009-11-06 | 2011-05-12 | Christian Maass | Feinstaubabsaugeeinrichtung |
| JP2016037419A (en) | 2014-08-08 | 2016-03-22 | 日本碍子株式会社 | Ozone generator |
| JP2016037420A (en) | 2014-08-08 | 2016-03-22 | 日本碍子株式会社 | Ozone generator and fault diagnosis method for the same |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535278B2 (en) * | 1974-03-18 | 1980-09-12 | ||
| DE3008176C2 (en) * | 1979-03-07 | 1986-02-20 | Crosfield Electronics Ltd., London | Engraving of printing cylinders |
| US4292397A (en) * | 1980-04-17 | 1981-09-29 | Dai Nippon Printing Co., Ltd. | Method for preparing dry planographic plates with plasma |
| US4718340A (en) * | 1982-08-09 | 1988-01-12 | Milliken Research Corporation | Printing method |
| DE3713801A1 (en) * | 1987-04-24 | 1988-11-10 | Forschungsgesellschaft Fuer Dr | Printing forme material for lithoprinting |
| US4777109A (en) * | 1987-05-11 | 1988-10-11 | Robert Gumbinner | RF plasma treated photosensitive lithographic printing plates |
| US5062364A (en) * | 1989-03-29 | 1991-11-05 | Presstek, Inc. | Plasma-jet imaging method |
| DE3917844C1 (en) * | 1989-06-01 | 1990-10-31 | Man Roland Druckmaschinen Ag, 6050 Offenbach, De | |
| US5187046A (en) * | 1991-03-18 | 1993-02-16 | Aluminum Company Of America | Arc-grained lithoplate |
| US5129321A (en) * | 1991-07-08 | 1992-07-14 | Rockwell International Corporation | Direct-to-press imaging system for use in lithographic printing |
-
1991
- 1991-07-19 DE DE4123959A patent/DE4123959C1/de not_active Expired - Fee Related
-
1992
- 1992-06-16 US US07/899,337 patent/US5317970A/en not_active Expired - Lifetime
- 1992-06-22 CA CA002071773A patent/CA2071773C/en not_active Expired - Fee Related
- 1992-07-13 EP EP92111869A patent/EP0523584B1/en not_active Expired - Lifetime
- 1992-07-13 DE DE59203363T patent/DE59203363D1/en not_active Expired - Lifetime
- 1992-07-16 JP JP18911892A patent/JP3217464B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8208114B2 (en) | 2002-06-19 | 2012-06-26 | Akt Electron Beam Technology Gmbh | Drive apparatus with improved testing properties |
| US7847566B2 (en) | 2004-02-12 | 2010-12-07 | Applied Materials, Inc. | Configurable prober for TFT LCD array test |
| US7919972B2 (en) | 2004-02-12 | 2011-04-05 | Applied Materials, Inc. | Integrated substrate transfer module |
| US7746088B2 (en) | 2005-04-29 | 2010-06-29 | Applied Materials, Inc. | In-line electron beam test system |
| US7786742B2 (en) | 2006-05-31 | 2010-08-31 | Applied Materials, Inc. | Prober for electronic device testing on large area substrates |
Also Published As
| Publication number | Publication date |
|---|---|
| US5317970A (en) | 1994-06-07 |
| JPH05193086A (en) | 1993-08-03 |
| DE59203363D1 (en) | 1995-09-28 |
| EP0523584A1 (en) | 1993-01-20 |
| CA2071773A1 (en) | 1993-01-20 |
| JP3217464B2 (en) | 2001-10-09 |
| DE4123959C1 (en) | 1993-02-04 |
| CA2071773C (en) | 1996-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0523584B1 (en) | Process for the regeneration of direct image offset printing forms | |
| EP1902156B1 (en) | Method for treating plasma and/or covering plasma of workpieces under continuous atmospheric pressure | |
| DE69532853T2 (en) | METHOD AND DEVICE FOR MICROWAVE PLASMA PRODUCTION | |
| EP1177914B1 (en) | Method to reclaim a reusable printing plate | |
| DE10227054B4 (en) | Reusable printing form, printing unit and printing machine with it as well as methods for imaging the printing form | |
| DE2531812B2 (en) | Gas discharge device | |
| EP0786337B1 (en) | Process for the imaging of erasable printing forms | |
| DE202005021576U1 (en) | Apparatus for carrying out a method for modifying surfaces of radiation-curable paints and lacquers by photochemical microfolding using short-wave monochromatic UV radiation under stable irradiation and inerting conditions | |
| DE60307062T2 (en) | METHOD FOR THE PLASMA CLEANING OF MATERIAL SURFACES COATED WITH AN ORGANIC SUBSTANCE AND DEVICE THEREFOR | |
| EP0570879A2 (en) | Process and device for erasing the ink-bearing layer on the surface of an imaged printing form | |
| EP0510503A2 (en) | Process for the treatment of surfaces | |
| EP0402798A2 (en) | Coating device | |
| EP1971448B1 (en) | Method and apparatus for treating a surface in order to free it of impurities | |
| DE2152100A1 (en) | Cascade pump - for electron beam welding appts | |
| WO2008131831A2 (en) | Method for the production of ceramic films, and apparatus for carrying out said method | |
| EP1375142A2 (en) | Rotary printing machine with a coating unit and procedure for coating a sheet conveying cylinder | |
| DE3120793A1 (en) | "METHOD AND DEVICE FOR THE DECONTAMINATION OF SOLID BODIES" | |
| EP1050395B1 (en) | Open uv/vuv excimer radiator and method for surface modification of polymers | |
| DE10204472A1 (en) | Polymer print surface is exposed to plasma discharge and laser light to create hydrophobic and hydrophilic print surface | |
| DE2433690C2 (en) | Device for the surface treatment of a metallographic sample | |
| EP1199165B1 (en) | Device for acting upon printing supports within a printing machine | |
| DE102006055186A1 (en) | Method for generating color information, e.g. B. motifs, on a support, in particular of glass | |
| DE2738839A1 (en) | Plasma etching metal coated substrates - by using a reaction gas composed of oxygen and carbon tetra:fluoride | |
| DE60133070T2 (en) | Treatment device and method | |
| CH675558A5 (en) | Mfg. screen mesh for screen printing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE FR GB IT LI NL SE |
|
| 17P | Request for examination filed |
Effective date: 19930203 |
|
| 17Q | First examination report despatched |
Effective date: 19940923 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO ROMA S.P.A. |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CH DE FR GB IT LI NL SE |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19950829 |
|
| REF | Corresponds to: |
Ref document number: 59203363 Country of ref document: DE Date of ref document: 19950928 |
|
| ET | Fr: translation filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20030630 Year of fee payment: 12 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20030708 Year of fee payment: 12 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040714 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050201 |
|
| EUG | Se: european patent has lapsed | ||
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20050201 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PFA Owner name: M.A.N.-ROLAND DRUCKMASCHINEN AKTIENGESELLSCHAFT Free format text: M.A.N.-ROLAND DRUCKMASCHINEN AKTIENGESELLSCHAFT#MUEHLHEIMERSTRASSE 341#D-63075 OFFENBACH A.M. (DE) -TRANSFER TO- M.A.N.-ROLAND DRUCKMASCHINEN AKTIENGESELLSCHAFT#MUEHLHEIMERSTRASSE 341#D-63075 OFFENBACH A.M. (DE) |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PFA Owner name: MANROLAND AG Free format text: M.A.N.-ROLAND DRUCKMASCHINEN AKTIENGESELLSCHAFT#MUEHLHEIMERSTRASSE 341#D-63075 OFFENBACH A.M. (DE) -TRANSFER TO- MANROLAND AG#MUEHLHEIMER STRA?E 341#63075 OFFENBACH (DE) |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20080715 Year of fee payment: 17 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20080725 Year of fee payment: 17 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20080722 Year of fee payment: 17 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: CD |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20090713 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090731 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090731 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090713 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20100723 Year of fee payment: 19 Ref country code: FR Payment date: 20100805 Year of fee payment: 19 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090713 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20120330 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120201 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110801 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59203363 Country of ref document: DE Effective date: 20120201 |