EP1700709A2 - Method and apparatus for the treatment of a reusable printing plate - Google Patents

Method and apparatus for the treatment of a reusable printing plate Download PDF

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Publication number
EP1700709A2
EP1700709A2 EP06101616A EP06101616A EP1700709A2 EP 1700709 A2 EP1700709 A2 EP 1700709A2 EP 06101616 A EP06101616 A EP 06101616A EP 06101616 A EP06101616 A EP 06101616A EP 1700709 A2 EP1700709 A2 EP 1700709A2
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EP
European Patent Office
Prior art keywords
printing
amphiphilic molecules
printing form
printing plate
aqueous solution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06101616A
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German (de)
French (fr)
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EP1700709B1 (en
EP1700709A3 (en
Inventor
Martin Gutfleisch
Matthias Dr. Schlörholz
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
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Heidelberger Druckmaschinen AG
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Publication of EP1700709A3 publication Critical patent/EP1700709A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B41C1/1033—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials by laser or spark ablation
    • 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
    • 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
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Definitions

  • the present invention relates to a method of treating a re-imageable printing plate after printing according to the preamble of claim 1.
  • the present invention relates to an apparatus for treating a re-imageable printing plate after printing according to the preamble of claim 9.
  • the DE 102 27 054 A1 describes a reusable printing form, in particular for use in offset printing, wherein the printing form z. B. has a support of titanium with a native oxidized titanium surface, which with amphiphilic molecules in aqueous or alcoholic solution, eg. B. is coated with a hydroxamic acid or a phosphonic acid such that the printing plate has a hydrophobic surface.
  • the printing form can be imaged by means of infrared light, wherein at the points which were exposed to infrared light, the amphiphilic molecules are removed and the hydrophilic surface of the printing plate is exposed. After a printing process, the surface of the printing form z. B.
  • UV extinguishing devices or other known extinguishing devices, such as.
  • plasma extinguishing devices or mechano-chemically acting devices to dispense and instead provide only a cleaning device and a device for covering with amphiphilic molecules. Since the production is interrupted during the re-imaging, there is also the desire to reduce this interruption by consuming extinguishing operations with long process times to a minimum or even avoid.
  • a method according to the invention for treating a re-imageable printing plate after printing, wherein the printing form has an amphiphilic-molecule-containing support and is cleaned of printing ink and provided with amphiphilic molecules for reprinting in the course of a re-imaging process, is characterized in that the printing plate in the History of Wiederbebsammlungsvorgangs is provided substantially before the cleaning of ink with amphiphilic molecules.
  • the re-imageable printing form in the still unpurified, ie provided with ink state already provided with amphiphilic molecules.
  • the amphiphilic molecules applied to the surface of the printing ink reach the surface of the printing plate at least at the points of the printing forme which are not provided with ink and bind there.
  • the surface of the printing form can be fully coated with amphiphilic molecules before the printing form is cleaned of printing ink. It has been found to be particularly advantageous that carrying out the cleaning after repopulation with amphiphilic molecules in a simpler manner feasible and in particular in a short time leads to a satisfactory cleaning result, since the ink does not come directly into contact with the surface of the carrier.
  • the surface of the printing form which was previously coated with amphiphilic molecules, is thus available for a renewed imaging process and subsequent re-printing.
  • a separate step of deleting the printing form can be advantageously avoided in this way, since the printing plate is transferred by the application of the amphiphilic molecules in a defined, homogeneously hydrophobic state and thus in an erased state.
  • the printing plate is provided with molecules in aqueous solution.
  • amphiphilic molecules in aqueous solution problems associated with the use of alcoholic solution due to low flash points can be advantageously avoided.
  • the water-soluble amphiphilic molecules can very easily diffuse through the dampening medium on the printing plate surface towards the surface of the support and bind there.
  • the aqueous solution does not dissolve the carrier, which would be expected with the use of ethanolic solution.
  • the printing plate is provided with Alcylphosphonklare in aqueous solution and / or located in aqueous solution of salt of Alcylphosphonklare.
  • the printing plate can also be provided with Alcylphosphat in aqueous solution and / or with befindlichem in aqueous solution salt of Alcylphosphat.
  • the printing plate is rinsed with water, in particular with distilled water, before and / or after being provided with amphiphilic molecules during the re-imaging process.
  • water in particular with distilled water
  • the dampening solution located on the printing form is replaced by water, by means of which the amphiphilic molecules can more easily reach the surface of the printing form than by the fountain solution mixed with auxiliaries.
  • an excess of such molecules can be easily removed.
  • Another embodiment of the method according to the invention is characterized in that the printing form is imaged with infrared radiation during the re-imaging process.
  • the amphiphilic molecules are removed from the surface of the printing form and the hydrophilic property of the printing form leads to a good moisturization at these points, ie to a very good wetting with Dampening solution.
  • the hydrophilic property of the printing form can be improved according to a further, particularly preferred embodiment of the invention by treating the printing form with a gumming agent during the re-imaging process. This deposits on the imaged areas of the printing form surface and positively influences the hydrophilic property.
  • the erfmdungshacke method for treating a Wegbembobaren printing form after printing and the advantageous embodiments of the method can also be used in a wet offset printing process, in which a Wegbecularbare printing form, which has a provided with amphiphilic molecules carrier is used.
  • a device for treating a re-imageable printing form after printing, wherein the printing form comprises a support provided with amphiphilic molecules, and wherein the device comprises a cleaning unit for cleaning the printing form of printing ink and a unit for covering the printing form with amphiphilic molecules characterized in that the device has a control unit which activates the unit for covering the printing form in amphiphilic molecules in such a way that it essentially acts before the cleaning unit in the course of a re-imaging operation.
  • a device according to the invention can be used in a substrate-processing machine, in particular in an offset printing press.
  • Fig. 1 shows schematically the sequence of an embodiment of the method according to the invention.
  • a titanium printing plate 110 which comprises a support 120 of titanium (Ti) with an oxidized surface 130 of titanium dioxide (TiO 2) - alternatively of TiOx, ZrO 2, A 12 O 3, another metal oxide or stainless steel - and a provided on the surface 130 occupancy with a layer 140 of amphiphilic molecules provided.
  • TiO 2 titanium dioxide
  • TiO 2 titanium dioxide
  • the surface of the printing plate 110 has a defined homogeneous hydrophobicity.
  • the printing plate 110 In a first preparation of the printing plate 110 before a first printing, the printing plate can be pre-cleaned with acetone in a first step and cleaned with ultraviolet radiation and activated (Example: using a xenon excimer UV lamp with an intensity of 45 mW / cm 2 and a wavelength of 172 nm, application about 10 minutes).
  • the printing plate 110 In a second step of the first preparation, the printing plate 110 can be immersed in 1 mM aqueous solution of amphiphilic molecules for up to 60 seconds, whereby the surface of the printing plate 110 obtains a hydrophobic character and becomes oleophilic for conventional offset printing inks.
  • titanium printing plates can also be roughened during the initial preparation, with a roughness (RMS) of approximately 350 nm having proved successful.
  • a process step 200 imaging
  • the printing plate 110 at non-image locations 210, ie at those locations which are not intended to accept color
  • infrared radiation 220 Example: wavelength about 810 to 1100 nm, power about 1 to 5 W, fluence about 30 to 40 J / cm 2 at a imaging speed, ie, a movement of the printing form, of about 1 to 2 m / s
  • the layer 140 ie the amphiphilic molecules
  • Irradiation produces imagewise hydrophilic areas.
  • the printing form 110 is imprinted with image information (positive image) in the form of remaining amphiphilic molecules or the printing form 110 with the image information is described.
  • the imaged printing form surface is coated with a gumming agent 260, e.g. B. the gum arabic-based product AGUM-Z (the company Hanns Eggen GmbH & Co. KG, Sarstedt in Germany), wetted and hydrophilized at the imaged sites.
  • a gumming agent 260 e.g. B. the gum arabic-based product AGUM-Z (the company Hanns Eggen GmbH & Co. KG, Sarstedt in Germany), wetted and hydrophilized at the imaged sites.
  • a method step 300 the printing forme 110 is provided with fountain solution 310, which adheres to the previously imaged and optionally rubberized areas 210.
  • the printing form 110 is provided with printing ink 410, which adheres to the locations of the printing form which are coated with amphiphilic molecules 140.
  • the locations of the printing form 110, which are coated with fountain solution 310 and therefore lipophobic, take on the other hand, no ink.
  • the surface of the printing form 110 has a printed image in the form of ink and fountain solution areas, and can therefore be used in a process step 500 (printing), e.g. As in the conventional wet offset printing process and in appropriately equipped offset printing presses are printed, including the surface of the printing plate 110 is brought into contact with a substrate 510.
  • the printed image can be reprinted several times, wherein the repeating 520 of steps 300 and 400, the printing plate 110 can be re-moistened and colored.
  • step 600 the printing plate 110 is rinsed with distilled water 610, which displaces the dampening solution located on the surface 110 and possibly contaminated.
  • a method step 700 (covering), the printing block 110, which is still uncoated by printing ink (or colorant-dampening emulsion), is charged with an aqueous solution of amphiphilic molecules, e.g. B. sprayed (alternatively: for example, dipping or rolling), which at the points 210, where dampening solution and / or distilled water is, reach the surface of the printing plate 110 and accumulate there, so that the surface 110 over the entire surface occupied with amphiphilic molecules 710 and the previous printed image is deleted. In other words, the previously imaged spots are refilled with amphiphilic molecules before cleaning ink.
  • an aqueous solution of amphiphilic molecules e.g. B. sprayed (alternatively: for example, dipping or rolling), which at the points 210, where dampening solution and / or distilled water is, reach the surface of the printing plate 110 and accumulate there, so that the surface 110 over the entire surface occupied with amphiphilic molecules 710 and the previous
  • the amphiphilic molecules must now diffuse to the printing plate surface only through the distilled water and not through the dampening solution, which may also contain isopropyl alcohol (IPA) and additives in addition to water Way leads to a better result in the occupancy with amphiphilic molecules and thus to a better erasure of the image information.
  • the exposure time of the aqueous solution of amphiphilic molecules is preferably about one minute. However, sufficient hydrophobization of the surface can be achieved after just a few seconds.
  • step 750 the printing plate 110 can be rinsed again with distilled water 760, whereby an excess of amphiphilic molecules can be removed.
  • a method step 800 cleaning
  • the printing form 110 is cleaned of printing ink 410.
  • the cleaning can be carried out using one or more cleaning agents, for. As the commercial cleaning agent Eurostar and IPA.
  • the printing plate 110 can be washed with ethanol and then z. B. are blown dry with nitrogen.
  • the printing plate 110 After completion of cleaning, the printing plate 110 is in a state corresponding to the state of printing in the provisioning step 100, that is, the printing plate 110 can be re-imaged, moistened, colored, printed and then processed (occupied and cleaned) by a repeat 810. In this way, the printing form can be used several times.
  • rinsing 600, coating 700, rinsing 750, cleaning 800, imaging 200, and hydrophilizing 250 may also be collectively referred to as a re-imaging process, wherein the reanimation process need not include all of these steps. So z. B. the optional process steps are omitted.
  • FIG. 2 the structure of an embodiment of the device according to the invention is shown schematically.
  • This has a printing form cylinder 912, a transfer cylinder 914 and an impression cylinder 916, wherein on the printing form cylinder 912 a printing plate 110 with a support 120 and a surface 130 and on the transfer cylinder 914 a blanket 915 are provided, and wherein a substrate 510 in the gap between the transfer cylinder 914 and the impression cylinder 916 is provided with ink.
  • the plate cylinder 912 may optionally be turned off the transfer cylinder 914.
  • a rinse unit 920 sprays the surface of the printing plate 110 with distilled water, thereby displacing the dampening solution.
  • a unit 930 for coating the printing plate 110 with amphiphilic molecules in aqueous solution is arranged downstream of the unit 920 in the direction of rotation of the printing plate cylinder 912 and sprays the surface of the printing plate 110 with the aqueous solution of amphiphilic molecules, whereby a full-surface layer of amphiphilic molecules is formed previous print image is deleted.
  • a cleaning unit 940 which z. B. with a brush washer the ink removed from the surface of the printing plate 110 (Alternatively, the printing ink can also be removed with a cloth washing device or via a washing device associated with an inking unit).
  • a imaging unit 950 which has an infrared laser, which writes a negative image on the printing plate 110 by infrared laser radiation and thus imaged, and optionally followed by a developing unit 960, the surface of the printing plate 110 z.
  • a developing unit 960 the surface of the printing plate 110 z.
  • dampening unit 970 and an inking unit 980 which provided the printing plate 110 with dampening solution and printing ink.
  • the printing forme 110 is thus available for reprinting after rinsing, proofing, rinsing, cleaning, imaging and hydrophilization.
  • the device 900 has a control unit 990 which via connections 995 drives at least the units 930 and 940 during a re-imaging operation, the control being designed such that the unit 930 operates in front of the unit 940, ie essentially before cleaning the printing form 110 of printing ink is assigned to the printing plate 110 with amphiphilic molecules in aqueous solution.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

Method involves basically a cleaning (800) of the printing ink (410) by amphiphilic molecules (140,710), which are provided during the reusable procedure (600,700,750,200,250) of printing plate (110). The printing plate is provided with an amphiphilic molecule carrier (120). The printing plate is provided with amphiphilic molecules present in the aqueous solution. Independent claims are also included for the following: (A) Wet offset printing procedure; (B) Device for treatment of reusable printing plate; and (C) Print processing machine.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Behandeln einer wiederbebilderbaren Druckform nach einem Drucken gemäß dem Oberbegriff von Anspruch 1.The present invention relates to a method of treating a re-imageable printing plate after printing according to the preamble of claim 1.

Des Weiteren betrifft die vorliegende Erfindung eine Vorrichtung zum Behandeln einer wiederbebilderbaren Druckform nach einem Drucken gemäß dem Oberbegriff von Anspruch 9.Furthermore, the present invention relates to an apparatus for treating a re-imageable printing plate after printing according to the preamble of claim 9.

Aus dem Stand der Technik ist es bekannt, Druckformen, insbesondere solche für den Offsetdruck, derart auszugestalten, dass diese nicht nur für einen Druckvorgang, sondern für mehrere, verschiedene Druckbilder erzeugende Druckvorgänge verwendet werden können und folglich als wiederverwendbare oder wiederbebilderbare Druckformen bezeichnet werden können. Bevor eine Druckform, welche zum Drucken mit Druckfarbe eingefärbt wurde, für einen erneuten Druckvorgang mit einem neuen Druckbild versehen werden kann, muss die von dem vorhergehenden Druckvorgang auf der Oberfläche der Druckform verbliebene Restfarbe von der Oberfläche in einem Reinigungsschritt entfernt werden. Gegebenenfalls muss die gereinigte Druckformoberfläche vor einem Wiederbebilderungsvorgang, z. B. durch Einstrahlung von UV-Licht, aktiviert werden.It is known from the prior art to design printing forms, in particular those for offset printing, in such a way that they can be used not only for one printing operation but for a plurality of different printing images producing printing operations and consequently can be referred to as reusable or reproducible printing forms. Before a printing form which has been inked for printing with printing ink can be provided with a new printed image for a reprinting operation, the residual ink remaining on the surface of the printing form from the preceding printing process must be removed from the surface in a cleaning step. Optionally, the cleaned printing surface must be before a Wiederbebilderungsvorgang, z. B. by irradiation of UV light activated.

Die DE 102 27 054 A1 beschreibt eine wiederverwendbare Druckform, insbesondere für den Einsatz im Offsetdruck, wobei die Druckform z. B. einen Träger aus Titan mit einer nativ oxidierten Titanoberfläche aufweist, welche mit amphiphilen Molekülen in wässriger oder alkoholischer Lösung, z. B. mit einer Hydroxamsäure oder einer Phosphonsäure derart belegt ist, dass die Druckform eine hydrophobe Oberfläche aufweist. Die Druckform kann mittels Infrarotlicht bebildert werden, wobei an den Stellen, welche mit Infrarotlicht beaufschlagt wurden, die amphiphilen Moleküle entfernt und die hydrophile Oberfläche der Druckform freigelegt wird. Nach einem Druckvorgang wird die Oberfläche der Druckform z. B. unter Zuhilfenahme eines handelsüblichen Reinigungsmittels wie Eurostar (der Firma DC Druck Chemie GmbH, Ammerbuch-Altingen in Deutschland) von Druckfarbe gereinigt bzw. befreit und mit UV-Licht großflächig gelöscht. Daran anschließend wird die Oberfläche der Druckform mit amphiphilen Molekülen belegt.The DE 102 27 054 A1 describes a reusable printing form, in particular for use in offset printing, wherein the printing form z. B. has a support of titanium with a native oxidized titanium surface, which with amphiphilic molecules in aqueous or alcoholic solution, eg. B. is coated with a hydroxamic acid or a phosphonic acid such that the printing plate has a hydrophobic surface. The printing form can be imaged by means of infrared light, wherein at the points which were exposed to infrared light, the amphiphilic molecules are removed and the hydrophilic surface of the printing plate is exposed. After a printing process, the surface of the printing form z. B. with the aid of a commercial cleaning agent such as Eurostar (the company DC Druck Chemie GmbH, Ammerbuch-Altingen in Germany) cleaned of printing ink or freed and erased over a large area with UV light. Subsequently, the surface of the printing form is coated with amphiphilic molecules.

Aus der EP 0 911 154 A1 ist ebenfalls bereits die Verwendung einer Titandioxid-Oberfläche als wiederbebilderbare Druckform bekannt, wobei auch hier ein UV-Löschen vorgesehen ist und die Druckform direkt nach dem Druckende in einer Waschstation von Druckfarbe gereinigt wird.From the EP 0 911 154 A1 The use of a titanium dioxide surface is also already known as a re-imageable printing form, wherein a UV erasing is also provided here and the printing form is cleaned of printing ink directly after the end of printing in a washing station.

Es wäre wünschenswert und unter Kostenaspekten vorteilhaft, auf eine Löschvorrichtung wie z. B. die in den oben zitierten Druckschriften verwendeten UV-Löschvorrichtungen, oder auch andere bekannte Löschvorrichtungen, wie z. B. Plasmalöschvorrichtungen oder mechano-chemisch wirkende Vorrichtungen, verzichten zu können und stattdessen lediglich eine Reinigungsvorrichtung und eine Vorrichtung zum Belegen mit amphiphilen Molekülen vorzusehen. Da die Produktion während des Wiederbebilderns unterbrochen ist, besteht ebenfalls der Wunsch, diese Unterbrechung durch aufwendige Löschvorgänge mit langen Prozesszeiten auf ein Minimum zu reduzieren oder gar zu vermeiden.It would be desirable and advantageous from a cost point of view, to an extinguishing device such. As used in the above-cited references UV extinguishing devices, or other known extinguishing devices, such as. As plasma extinguishing devices or mechano-chemically acting devices to dispense and instead provide only a cleaning device and a device for covering with amphiphilic molecules. Since the production is interrupted during the re-imaging, there is also the desire to reduce this interruption by consuming extinguishing operations with long process times to a minimum or even avoid.

In der EP 0 962 333 A1 wird ein Wiederbebilderungsverfahren beschrieben, bei welchem nach Druckende alle auf der Oberfläche der verwendeten Druckform befindlichen selbstorganisierenden Moleküle zunächst durch Energiezufuhr entfernt werden und eine neue Schicht dieser Moleküle aufgebracht wird.In the EP 0 962 333 A1 describes a Wiederbebilderungsverfahren in which after printing all located on the surface of the printing plate used self-organizing molecules are first removed by energy supply and a new layer of these molecules is applied.

Da auch der Prozessschritt des Entfernens von selbstorganisierenden Molekülen Zeit kostet und somit Produktionsausfallzeiten erzeugt, wäre es weiterhin wünschenswert, auf diese Entfernen verzichten zu können.Also, since the process step of removing self-assembling molecules takes time and thus produces production downtime, it would further be desirable to be able to dispense with such removal.

Aus einer Veröffentlichung von R. Hofer et al. in Langmuir 2001, 17, 4014 - 4020 , sind bereits spezielle amphiphile Moleküle in wässriger Lösung bekannt.From a publication of R. Hofer et al. in Langmuir 2001, 17, 4014 - 4020 , special amphiphilic molecules are already known in aqueous solution.

Ausgehend von dem oben zitierten Stand der Technik ist es eine Aufgabe der vorliegenden Erfindung, ein Verfahren und eine Vorrichtung zu schaffen, die es jeweils ermöglichen, eine wiederbebilderbare Druckform auf einfache Weise in einen für eine erneute Bebilderung und ein erneutes Drucken defmierten, homogen hydrophoben Ausgangszustand zu bringen.Starting from the above-cited prior art, it is an object of the present invention to provide a method and a device, each of which enables a reproducible printing form in a simple manner in a defined for re-imaging and reprinting, homogeneously hydrophobic initial state to bring.

Diese Aufgabe wird mit den Merkmalen der Patentansprüche 1 und 9 gelöst. Weitere vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen enthalten.This object is achieved with the features of claims 1 and 9. Further advantageous embodiments of the invention are contained in the subclaims.

Ein erfindungsgemäßes Verfahren zum Behandeln einer wiederbebilderbaren Druckform nach einem Drucken, wobei die Druckform einen mit amphiphilen Molekülen versehenen Träger aufweist und für ein erneutes Drucken im Verlauf eines Wiederbebilderungsvorgangs von Druckfarbe gereinigt und mit amphiphilen Molekülen versehen wird, zeichnet sich dadurch aus, dass die Druckform im Verlauf des Wiederbebilderungsvorgangs im Wesentlichen vor dem Reinigen von Druckfarbe mit amphiphilen Molekülen versehen wird.A method according to the invention for treating a re-imageable printing plate after printing, wherein the printing form has an amphiphilic-molecule-containing support and is cleaned of printing ink and provided with amphiphilic molecules for reprinting in the course of a re-imaging process, is characterized in that the printing plate in the History of Wiederbebierungsvorgangs is provided substantially before the cleaning of ink with amphiphilic molecules.

Erfmdungsgemäß und in Abkehr von den Lösungen des Standes der Technik wird in dem Verfahren die wiederbebilderbare Druckform im noch ungereinigten, d. h. mit Druckfarbe versehenen Zustand, bereits mit amphiphilen Molekülen versehen. Die dabei auf die Oberfläche der Druckfarbe aufgebrachten amphiphilen Moleküle gelangen zumindest an den nicht mit Druckfarbe versehenen Stellen der Druckform an die Oberfläche der Druckform und binden dort an. Auf diese Weise kann die Oberfläche der Druckform vollflächig mit amphiphilen Molekülen belegt werden, bevor die Druckform von Druckfarbe gereinigt wird. Es hat sich dabei als besonders vorteilhaft herausgestellt, dass das Durchführen der Reinigung nach dem Wiederbelegen mit amphiphilen Molekülen in einfacherer Weise durchführbar ist und insbesondere in kurzer Zeit zu einem befriedigenden Reinigungsergebnis führt, da die Druckfarbe nicht direkt mit der Oberfläche des Trägers in Berührung kommt. Nach dem Reinigen steht somit die bereits vorher mit amphiphilen Molekülen belegte Oberfläche der Druckform für einen erneuten Bebilderungsprozess und ein sich daran anschließendes erneutes Drucken zur Verfügung. Ein separater Schritt des Löschens der Druckform kann auf diese Weise vorteilhaft vermieden werden, da die Druckform durch das Aufbringen der amphiphilen Moleküle in einen definierten, homogen hydrophoben Zustand und somit in einen gelöschten Zustand überführt wird.According to the invention and in departure from the solutions of the prior art, in the process the re-imageable printing form in the still unpurified, ie provided with ink state, already provided with amphiphilic molecules. The amphiphilic molecules applied to the surface of the printing ink reach the surface of the printing plate at least at the points of the printing forme which are not provided with ink and bind there. In this way, the surface of the printing form can be fully coated with amphiphilic molecules before the printing form is cleaned of printing ink. It has been found to be particularly advantageous that carrying out the cleaning after repopulation with amphiphilic molecules in a simpler manner feasible and in particular in a short time leads to a satisfactory cleaning result, since the ink does not come directly into contact with the surface of the carrier. After cleaning, the surface of the printing form, which was previously coated with amphiphilic molecules, is thus available for a renewed imaging process and subsequent re-printing. A separate step of deleting the printing form can be advantageously avoided in this way, since the printing plate is transferred by the application of the amphiphilic molecules in a defined, homogeneously hydrophobic state and thus in an erased state.

Gemäß einer bevorzugten Ausführungsform der Erfindung wird die Druckform mit in wässriger Lösung befindlichen Molekülen versehen. Durch die Verwendung von amphiphilen Molekülen in wässriger Lösung können Probleme, welche im Zusammenhang mit der Verwendung von alkoholischer Lösung auf Grund niedriger Flammpunkte entstünden, in vorteilhafter Weise vermieden werden. Gleichzeitig ergibt sich der Vorteil, dass die wasserlöslichen amphiphilen Moleküle sehr leicht durch das Feuchtmitttel auf der Druckformoberfläche zur Oberfläche des Trägers hin diffundieren und dort anbinden können. Darüber hinaus ergibt sich der Vorteil, dass die wässrige Lösung den Träger nicht anlöst, was bei der Verwendung von ethanolischer Lösung zu erwarten wäre.According to a preferred embodiment of the invention, the printing plate is provided with molecules in aqueous solution. By using amphiphilic molecules in aqueous solution, problems associated with the use of alcoholic solution due to low flash points can be advantageously avoided. At the same time there is the advantage that the water-soluble amphiphilic molecules can very easily diffuse through the dampening medium on the printing plate surface towards the surface of the support and bind there. In addition, there is the advantage that the aqueous solution does not dissolve the carrier, which would be expected with the use of ethanolic solution.

Gemäß einer diesbezüglich besonders bevorzugten Ausführungsform der Erfindung wird die Druckform mit in wässriger Lösung befindlicher Alcylphosphonsäure und/oder mit in wässriger Lösung befindlichem Salz von Alcylphosphonsäure versehen. Alternativ kann die Druckform auch mit in wässriger Lösung befindlichem Alcylphosphat und/oder mit in wässriger Lösung befindlichem Salz von Alcylphosphat versehen werden.According to a particularly preferred embodiment of the invention, the printing plate is provided with Alcylphosphonsäure in aqueous solution and / or located in aqueous solution of salt of Alcylphosphonsäure. Alternatively, the printing plate can also be provided with Alcylphosphat in aqueous solution and / or with befindlichem in aqueous solution salt of Alcylphosphat.

Gemäß einer weiteren, besonders bevorzugten Ausführungsform der Erfindung wird die Druckform im Verlauf des Wiederbebilderungsvorgangs vor und/oder nach dem Versehen mit amphiphilen Molekülen mit Wasser, insbesondere mit destilliertem Wasser, gespült. Durch das Spülen der Druckform vor dem Versehen mit amphiphilen Molekülen wird das auf der Druckform befindliche Feuchtmittel durch Wasser ersetzt, durch welches die amphiphilen Moleküle leichter zur Oberfläche der Druckform gelangen können, als durch das mit Hilfsstoffen versetzte Feuchtmittel. Durch das Spülen der Druckform nach dem Versehen mit amphiphilen Molekülen kann ein Überschuss an solchen Molekülen auf einfache Weise entfernt werden.According to a further, particularly preferred embodiment of the invention, the printing plate is rinsed with water, in particular with distilled water, before and / or after being provided with amphiphilic molecules during the re-imaging process. By rinsing the printing forme before being provided with amphiphilic molecules, the dampening solution located on the printing form is replaced by water, by means of which the amphiphilic molecules can more easily reach the surface of the printing form than by the fountain solution mixed with auxiliaries. By rinsing the printing plate after being provided with amphiphilic molecules, an excess of such molecules can be easily removed.

Eine weitere Ausführungsform des erfmdungsgemäßen Verfahrens zeichnet sich dadurch aus, dass die Druckform im Verlauf des Wiederbebilderungsvorgangs mit Infrarotstrahlung bebildert wird. An den bebilderten Stellen werden die amphiphilen Moleküle von der Oberfläche der Druckform entfernt und die hydrophile Eigenschaft der Druckform führt zu einem guten Feuchten an diesen Stellen, d. h. zu einer sehr guten Benetzung mit Feuchtmittel. Die hydrophile Eigenschaft der Druckform kann gemäß einer weiteren, besonders bevorzugten Ausführungsform der Erfindung verbessert werden, indem die Druckform im Verlauf des Wiederbebilderungsvorgangs mit einem Gummiermittel behandelt wird. Dieses lagert sich an den bebilderten Stellen der Druckformoberfläche an und beeinflusst die hydrophile Eigenschaft in positiver Weise.Another embodiment of the method according to the invention is characterized in that the printing form is imaged with infrared radiation during the re-imaging process. At the imaged points, the amphiphilic molecules are removed from the surface of the printing form and the hydrophilic property of the printing form leads to a good moisturization at these points, ie to a very good wetting with Dampening solution. The hydrophilic property of the printing form can be improved according to a further, particularly preferred embodiment of the invention by treating the printing form with a gumming agent during the re-imaging process. This deposits on the imaged areas of the printing form surface and positively influences the hydrophilic property.

Das erfmdungsgemäße Verfahren zum Behandeln einer wiederbebilderbaren Druckform nach einem Drucken sowie die vorteilhaften Ausführungsformen des Verfahrens können weiterhin in einem Nassoffset-Druckverfahren Anwendung finden, bei welchem eine wiederbebilderbare Druckform, welche einen mit amphiphilen Molekülen versehenen Träger aufweist, zum Einsatz kommt.The erfmdungsgemäße method for treating a wiederbebilderbaren printing form after printing and the advantageous embodiments of the method can also be used in a wet offset printing process, in which a wiederbebilderbare printing form, which has a provided with amphiphilic molecules carrier is used.

Eine erfmdungsgemäße Vorrichtung zum Behandeln einer wiederbebilderbaren Druckform nach einem Drucken, wobei die Druckform einen mit amphiphilen Molekülen versehenen Träger aufweist, und wobei die Vorrichtung eine Reinigungseinheit zum Reinigen der Druckform von Druckfarbe und eine Einheit zum Belegen der Druckform mit amphiphilen Molekülen aufweist, zeichnet sich dadurch aus, dass die Vorrichtung eine Steuereinheit aufweist, welche die Einheit zum Belegen der Druckform in amphiphilen Molekülen derart ansteuert, dass diese im Verlauf eines Wiederbebilderungsvorgangs im Wesentlichen vor der Reinigungseinheit tätig wird.A device according to the invention for treating a re-imageable printing form after printing, wherein the printing form comprises a support provided with amphiphilic molecules, and wherein the device comprises a cleaning unit for cleaning the printing form of printing ink and a unit for covering the printing form with amphiphilic molecules characterized in that the device has a control unit which activates the unit for covering the printing form in amphiphilic molecules in such a way that it essentially acts before the cleaning unit in the course of a re-imaging operation.

Mit der erfmdungsgemäßen Ansteuerung gehen dieselben Vorteile einher, wie sie oben mit Bezug zu dem erfindungsgemäßen Verfahren beschrieben wurden.With the inventive control associated with the same advantages, as described above with reference to the inventive method.

Eine erfindungsgemäße Vorrichtung kann in einer Bedruckstoff verarbeitenden Maschine, insbesondere in einer Offsetdruckmaschine, eingesetzt werden.A device according to the invention can be used in a substrate-processing machine, in particular in an offset printing press.

Die Erfindung wird nachfolgend mit Bezug auf die Zeichnungen näher erläutert.The invention will be explained in more detail with reference to the drawings.

In den Zeichnungen zeigen:

  • Fig. 1 Ablauf einer Ausführungsform des erfindungsgemäßen Verfahrens; und
  • Fig. 2 Ausführungsform einer erfindungsgemäßen Vorrichtung.
In the drawings show:
  • Fig. 1 sequence of an embodiment of the method according to the invention; and
  • Fig. 2 embodiment of a device according to the invention.

In den Figuren sind einander entsprechende oder gleiche Merkmale mit den gleichen Bezugszeichen versehen.In the figures, corresponding or identical features are provided with the same reference numerals.

Fig. 1 zeigt schematisch den Ablauf einer Ausführungsform des erfindungsgemäßen Verfahrens. In einem Verfahrensschritt 100 (Bereitstellen) wird eine Titan-Druckform 110, welche einen Träger 120 aus Titan (Ti) mit einer oxidierten Oberfläche 130 aus Titandioxid (TiO2) - alternativ aus TiOx, ZrO2, A12O3, einem anderen Metalloxid oder Edelstahl - und eine auf der Oberfläche 130 befindliche Belegung mit einer Schicht 140 aus amphiphilen Molekülen aufweist, bereitgestellt. Durch die Belegung mit den amphiphilen Molekülen weist die Oberfläche der Druckform 110 eine defmierte homogene Hydrophobie auf.Fig. 1 shows schematically the sequence of an embodiment of the method according to the invention. In a method step 100 (providing), a titanium printing plate 110 which comprises a support 120 of titanium (Ti) with an oxidized surface 130 of titanium dioxide (TiO 2) - alternatively of TiOx, ZrO 2, A 12 O 3, another metal oxide or stainless steel - and a provided on the surface 130 occupancy with a layer 140 of amphiphilic molecules provided. By occupying with the amphiphilic molecules, the surface of the printing plate 110 has a defined homogeneous hydrophobicity.

Bei einer Erstpräparation der Druckform 110 vor einem ersten Drucken kann die Druckform in einem ersten Schritt mit Aceton vorgereinigt und mit ultravioletter Strahlung gereinigt und aktiviert werden (Beispiel: Verwendung eines Xenon-Excimer-UV-Strahlers mit einer Intensität von 45 mW/cm2 und einer Wellenlänge von 172 nm; Anwendung etwa 10 Minuten). In einem zweiten Schritt der Erstpräparation kann die Druckform 110 für bis zu 60 Sekunden in 1 mM wässriger Lösung amphiphiler Moleküle getaucht werden, wodurch die Oberfläche der Druckform 110 einen hydrophoben Charakter erhält und oleophil für konventionelle Offsetdruckfarben wird. Ferner können Titan-Druckformen während der Erstpräparation auch aufgeraut werden, wobei sich eine Rauheit (RMS) von etwa 350 nm bewährt hat.In a first preparation of the printing plate 110 before a first printing, the printing plate can be pre-cleaned with acetone in a first step and cleaned with ultraviolet radiation and activated (Example: using a xenon excimer UV lamp with an intensity of 45 mW / cm 2 and a wavelength of 172 nm, application about 10 minutes). In a second step of the first preparation, the printing plate 110 can be immersed in 1 mM aqueous solution of amphiphilic molecules for up to 60 seconds, whereby the surface of the printing plate 110 obtains a hydrophobic character and becomes oleophilic for conventional offset printing inks. Furthermore, titanium printing plates can also be roughened during the initial preparation, with a roughness (RMS) of approximately 350 nm having proved successful.

In einem Verfahrensschritt 200 (Bebildern) wird die Druckform 110 an Nicht-Bildstellen 210, d. h. an solchen Stellen, die keine Farbe annehmen sollen, mit Infrarotstrahlung 220 (Beispiel: Wellenlänge etwa 810 bis 1100 nm, Leistung etwa 1 bis 5 W, Fluenz etwa 30 bis 40 J/cm2 bei einer Bebilderungsgeschwindigkeit, d. h. einer Bewegung der Druckform, von etwa 1 bis 2 m/s) in Form eines Negativ-Bildes bestrahlt, wodurch die Schicht 140, d. h. die amphiphilen Moleküle, an den Stellen 210 entfernt wird.In a process step 200 (imaging), the printing plate 110 at non-image locations 210, ie at those locations which are not intended to accept color, with infrared radiation 220 (Example: wavelength about 810 to 1100 nm, power about 1 to 5 W, fluence about 30 to 40 J / cm 2 at a imaging speed, ie, a movement of the printing form, of about 1 to 2 m / s) in the form of a negative image, whereby the layer 140, ie the amphiphilic molecules, is removed at the locations 210 ,

Durch die Bestrahlung werden bildpunktweise hydrophile Bereiche erzeugt. Auf diese Weise wird der Druckform 110 eine Bildinformation (Positiv-Bild) in Form von verbleibenden amphiphilen Molekülen aufgeprägt bzw. wird die Druckform 110 mit der Bildinformation beschrieben.Irradiation produces imagewise hydrophilic areas. In this way, the printing form 110 is imprinted with image information (positive image) in the form of remaining amphiphilic molecules or the printing form 110 with the image information is described.

In einem optionalen Verfahrensschritt 250 (Hydrophilisieren) wird die bebilderte Druckformoberfläche mit einem Gummiermittel 260, z. B. dem auf Gummiarabikum basierenden Produkt AGUM-Z (der Firma Hanns Eggen GmbH & Co. KG, Sarstedt in Deutschland), benetzt und an den bebilderten Stellen hydrophilisiert.In an optional process step 250 (hydrophilization), the imaged printing form surface is coated with a gumming agent 260, e.g. B. the gum arabic-based product AGUM-Z (the company Hanns Eggen GmbH & Co. KG, Sarstedt in Germany), wetted and hydrophilized at the imaged sites.

In einem Verfahrensschritt 300 (Feuchten) wird die Druckform 110 mit Feuchtmittel 310 versehen, welches an den zuvor bebilderten und gegebenenfalls gummierten Stellen 210 anhaftet.In a method step 300 (moist), the printing forme 110 is provided with fountain solution 310, which adheres to the previously imaged and optionally rubberized areas 210.

In einem Verfahrensschritt 400 (Einfärben) wird die Druckform 110 mit Druckfarbe 410 versehen, welche an den Stellen der Druckform anhaftet, welche mit amphiphilen Molekülen 140 belegt sind. Die Stellen der Druckform 110, welche mit Feuchtmittel 310 belegt und daher lipophob sind, nehmen dagegen keine Druckfarbe an.In a method step 400 (inking), the printing form 110 is provided with printing ink 410, which adheres to the locations of the printing form which are coated with amphiphilic molecules 140. The locations of the printing form 110, which are coated with fountain solution 310 and therefore lipophobic, take on the other hand, no ink.

Nach dem Feuchten 300 und dem Einfärben 400 weist die Oberfläche der Druckform 110 ein Druckbild in Form von Druckfarbe- und Feuchtmittelbereichen auf, und kann daher in einem Verfahrensschritt 500 (Drucken), z. B. im konventionellen Nassoffset-Druckverfahren und in entsprechend ausgerüsteten Offsetdruckmaschinen, abgedruckt werden, wozu die Oberfläche der Druckform 110 mit einem Bedruckstoff 510 in Kontakt gebracht wird. Das Druckbild kann mehrfach abgedruckt werden, wobei durch die Wiederholung 520 der Schritte 300 und 400 die Druckform 110 erneut gefeuchtet und eingefärbt werden kann.After the moistening 300 and the inking 400, the surface of the printing form 110 has a printed image in the form of ink and fountain solution areas, and can therefore be used in a process step 500 (printing), e.g. As in the conventional wet offset printing process and in appropriately equipped offset printing presses are printed, including the surface of the printing plate 110 is brought into contact with a substrate 510. The printed image can be reprinted several times, wherein the repeating 520 of steps 300 and 400, the printing plate 110 can be re-moistened and colored.

In einem optionalen Verfahrensschritt 600 (Spülen) wird die Druckform 110 mit destilliertem Wasser 610 gespült, welches das auf der Oberfläche 110 befindliche und gegebenenfalls Verschmutzungen aufweisende Feuchtmittel verdrängt.In an optional method step 600 (rinsing), the printing plate 110 is rinsed with distilled water 610, which displaces the dampening solution located on the surface 110 and possibly contaminated.

In einem Verfahrensschritt 700 (Belegen) wird die noch von Druckfarbe (bzw. Farb-Feuchtmittel-Emulsion) ungereinigte Druckform 110 mit einer wässrigen Lösung amphiphiler Moleküle beaufschlagt, z. B. besprüht (alternativ: z. B. Tauchen oder Aufwalzen), welche an den Stellen 210, an denen sich Feuchtmittel und/oder destilliertes Wasser befindet, an die Oberfläche der Druckform 110 gelangen und sich dort anlagern, so dass die Oberfläche 110 vollflächig mit amphiphilen Molekülen 710 belegt und das vorherige Druckbild gelöscht wird. Mit anderen Worten: die zuvor bebilderten Stellen werden - vor dem Reinigen von Druckfarbe - wieder mit amphiphilen Molekülen aufgefüllt. Wurde die Druckform 110 zuvor in Verfahrensschritt 600 mit destilliertem Wasser gespült, so müssen die amphiphilen Moleküle nun nur durch das destillierte Wasser und nicht durch das Feuchtmittel, welches außer Wasser auch Isopropylalkohol (IPA) und Zusatzstoffe enthalten kann, zur Druckformoberfläche diffundieren, was in vorteilhafter Weise zu einem besseren Ergebnis bei der Belegung mit amphiphilen Molekülen und somit zu einem besseren Löschen der Bildinformation führt. Die Einwirkzeit der wässrigen Lösung amphiphiler Moleküle beträgt bevorzugt etwa eine Minute. Eine ausreichende Hydrophobisierung der Oberfläche ist jedoch schon nach wenigen Sekunden erreichbar.In a method step 700 (covering), the printing block 110, which is still uncoated by printing ink (or colorant-dampening emulsion), is charged with an aqueous solution of amphiphilic molecules, e.g. B. sprayed (alternatively: for example, dipping or rolling), which at the points 210, where dampening solution and / or distilled water is, reach the surface of the printing plate 110 and accumulate there, so that the surface 110 over the entire surface occupied with amphiphilic molecules 710 and the previous printed image is deleted. In other words, the previously imaged spots are refilled with amphiphilic molecules before cleaning ink. If the printing plate 110 was previously rinsed with distilled water in method step 600, the amphiphilic molecules must now diffuse to the printing plate surface only through the distilled water and not through the dampening solution, which may also contain isopropyl alcohol (IPA) and additives in addition to water Way leads to a better result in the occupancy with amphiphilic molecules and thus to a better erasure of the image information. The exposure time of the aqueous solution of amphiphilic molecules is preferably about one minute. However, sufficient hydrophobization of the surface can be achieved after just a few seconds.

Als amphiphile, wasserlösliche Moleküle werden bevorzugt folgende Substanzen gewählt:

  • Alcylphosphonsäuren oder Salze von Alcylphosphonsäuren (Phosphonate):
    Figure imgb0001
    Figure imgb0002
  • Alcylphosphate oder Salze von Alcylphosphaten (Phosphatate)
    Figure imgb0003
    Figure imgb0004
K = Kation (z.B. Ca, K, Na, Cs, Mg)
R=
Figure imgb0005
 Es wird bevorzugt eine 0,1 bis 1 mM wässrige Lösung verwendet.The following substances are preferably selected as amphiphilic, water-soluble molecules:
  • Alcylphosphonic acids or salts of Alcylphosphonsäuren (phosphonates):
    Figure imgb0001
    Figure imgb0002
  • Alcylphosphates or salts of Alcylphosphaten (Phosphatate)
    Figure imgb0003
    Figure imgb0004
K = cation (eg Ca, K, Na, Cs, Mg)
R =
Figure imgb0005
 It is preferred to use a 0.1 to 1 mM aqueous solution.

In einem optionalen Verfahrensschritt 750 (Nachspülen) kann die Druckform 110 mit destilliertem Wasser 760 erneut gespült werden, wodurch ein Überschuss an amphiphilen Molekülen entfernt werden kann.In an optional process step 750 (rinsing), the printing plate 110 can be rinsed again with distilled water 760, whereby an excess of amphiphilic molecules can be removed.

In einem Verfahrensschritt 800 (Reinigen) wird die Druckform 110 von Druckfarbe 410 gereinigt. Die Reinigung kann unter Einsatz eines oder mehrerer Reinigungsmittel erfolgen, z. B. des handelsüblichen Reinigungsmittels Eurostar und IPA. Weiterhin kann die Druckform 110 mit Ethanol gewaschen und anschließend z. B. mit Stickstoff trocken geblasen werden.In a method step 800 (cleaning), the printing form 110 is cleaned of printing ink 410. The cleaning can be carried out using one or more cleaning agents, for. As the commercial cleaning agent Eurostar and IPA. Furthermore, the printing plate 110 can be washed with ethanol and then z. B. are blown dry with nitrogen.

Nach abgeschlossener Reinigung befindet sich die Druckform 110 in einem Zustand, der dem Zustand der Druckfom im Bereitstellungsschritt 100 entspricht, d. h. die Druckform 110 kann durch eine Wiederholung 810 erneut bebildert, gefeuchtet, eingefärbt, abgedruckt und anschließend prozessiert (belegt und gereinigt) werden. Auf diese Weise kann die Druckform mehrfach verwendet werden.After completion of cleaning, the printing plate 110 is in a state corresponding to the state of printing in the provisioning step 100, that is, the printing plate 110 can be re-imaged, moistened, colored, printed and then processed (occupied and cleaned) by a repeat 810. In this way, the printing form can be used several times.

Die Verfahrensschritte des Spülens 600, des Belegens 700, des Nachspülens 750, des Reinigens 800, des Bebilderns 200 und des Hydrophilisierens 250 können zusammengefasst auch als Wiederbebilderungsvorgang verstanden werden, wobei der Wiederbebilderungsvorgang nicht alle diese Schritte umfassen muss. So können z. B. die optionalen Verfahrensschritte ausgelassen werden.The process steps of rinsing 600, coating 700, rinsing 750, cleaning 800, imaging 200, and hydrophilizing 250 may also be collectively referred to as a re-imaging process, wherein the reanimation process need not include all of these steps. So z. B. the optional process steps are omitted.

In Fig. 2 ist schematisch der Aufbau einer Ausführungsform der erfindungsgemäßen Vorrichtung dargestellt. Diese weist einen Druckformzylinder 912, einen Übertragungszylinder 914 und einen Gegendruckzylinder 916 auf, wobei auf dem Druckformzylinder 912 eine Druckform 110 mit einem Träger 120 und einer Oberfläche 130 und auf dem Übertragungszylinder 914 ein Gummituch 915 vorgesehen sind, und wobei ein Bedruckstoff 510 im Spalt zwischen dem Übertragungszylinder 914 und dem Gegendruckzylinder 916 mit Druckfarbe versehen wird.In Fig. 2, the structure of an embodiment of the device according to the invention is shown schematically. This has a printing form cylinder 912, a transfer cylinder 914 and an impression cylinder 916, wherein on the printing form cylinder 912 a printing plate 110 with a support 120 and a surface 130 and on the transfer cylinder 914 a blanket 915 are provided, and wherein a substrate 510 in the gap between the transfer cylinder 914 and the impression cylinder 916 is provided with ink.

Nach einem Drucken kann der Druckformzylinder 912 optional von dem Übertragungszylinder 914 abgestellt werden. Eine Spüleinheit 920 besprüht die Oberfläche der Druckform 110 mit destilliertem Wasser, wodurch das Feuchtmittel verdrängt bzw. weggespült wird.After printing, the plate cylinder 912 may optionally be turned off the transfer cylinder 914. A rinse unit 920 sprays the surface of the printing plate 110 with distilled water, thereby displacing the dampening solution.

Eine Einheit 930 zum Belegen der Druckform 110 mit amphiphilen Molekülen in wässriger Lösung ist der Einheit 920 in Drehrichtung des Druckformzylinders 912 an dessen Umfang nachgeordnet und besprüht die Oberfläche der Druckform 110 mit der wässrigen Lösung amphiphiler Moleküle, wodurch eine vollflächige Schicht amphiphiler Moleküle entsteht und das vorherige Druckbild gelöscht wird.A unit 930 for coating the printing plate 110 with amphiphilic molecules in aqueous solution is arranged downstream of the unit 920 in the direction of rotation of the printing plate cylinder 912 and sprays the surface of the printing plate 110 with the aqueous solution of amphiphilic molecules, whereby a full-surface layer of amphiphilic molecules is formed previous print image is deleted.

In Drehrichtung folgt eine Reinigungseinheit 940, welche z. B. mit einer Bürstenwascheinrichtung die Druckfarbe von der Oberfläche der Druckform 110 entfernt (alternativ kann die Druckfarbe auch mit einer Tuchwascheinrichtung oder über eine einem Farbwerk zugeordnete Wascheinrichtung abgenommen werden).In the direction of rotation is followed by a cleaning unit 940, which z. B. with a brush washer the ink removed from the surface of the printing plate 110 (Alternatively, the printing ink can also be removed with a cloth washing device or via a washing device associated with an inking unit).

Es folgt weiterhin eine Bebilderungseinheit 950, welche einen Infrarot-Laser aufweist, der durch Infrarot-Laserstrahlung ein Negativ-Bild auf die Druckform 110 schreibt und diese somit bebildert, und es folgt gegebenenfalls eine Entwicklungseinheit 960, welche die Oberfläche der Druckform 110 z. B. mit einem Gummiermittel zur Hydrophilisierung benetzt.This is followed by a imaging unit 950, which has an infrared laser, which writes a negative image on the printing plate 110 by infrared laser radiation and thus imaged, and optionally followed by a developing unit 960, the surface of the printing plate 110 z. B. wetted with a gum for hydrophilization.

Weiterhin nachgeordnet sind ein Feuchtwerk 970 und ein Farbwerk 980, welche die Druckform 110 mit Feuchtmittel und Druckfarbe versehen. Die Druckform 110 steht nach dem Spülen, Belegen, Nachspülen, Reinigen, Bebildern und Hydrophilisieren somit für ein erneutes Drucken zur Verfügung.Further downstream are a dampening unit 970 and an inking unit 980, which provided the printing plate 110 with dampening solution and printing ink. The printing forme 110 is thus available for reprinting after rinsing, proofing, rinsing, cleaning, imaging and hydrophilization.

Die Vorrichtung 900 weist eine Steuerungseinheit 990 auf, welche über Verbindungen 995 zumindest die Einheiten 930 und 940 während eines Wiederbebilderungsvorgangs ansteuert, wobei die Ansteuerung derart ausgelegt, ist, dass die Einheit 930 vor der Einheit 940 tätig wird, d. h. dass im Wesentlichen vor einer Reinigung der Druckform 110 von Druckfarbe eine Belegung der Druckform 110 mit amphiphilen Molekülen in wässriger Lösung erfolgt.The device 900 has a control unit 990 which via connections 995 drives at least the units 930 and 940 during a re-imaging operation, the control being designed such that the unit 930 operates in front of the unit 940, ie essentially before cleaning the printing form 110 of printing ink is assigned to the printing plate 110 with amphiphilic molecules in aqueous solution.

Liste der BezugszeichenList of reference numbers

100100
Bereitstellen der DruckformProviding the printing form
110110
Druckformprinting form
120120
Trägercarrier
130130
Oberflächesurface
140140
Schicht amphiphiler MoleküleLayer of amphiphilic molecules
200200
Bebildernillustrate
210210
Nicht-BildstellenNon-image areas
220220
IR-StrahlungIR radiation
250250
Hydrophilisierenhydrophilizing
260260
Gummiermittelgumming
300300
Feuchtenwet
310310
Feuchtmitteldampening solution
400400
Einfärbendye
410410
Druckfarbeprinting ink
500500
DruckenTo Print
510510
Bedruckstoffsubstrate
520520
Wiederholungrepeat
600600
Spülendo the washing up
610610
Destilliertes WasserDistilled water
700700
BelegenOccupy
710710
Schicht amphiphiler MoleküleLayer of amphiphilic molecules
750750
Nachspülenrinse
760760
Destilliertes WasserDistilled water
800800
Reinigungcleaning
810810
Wiederholungrepeat
900900
Vorrichtungcontraption
912912
DruckformzylinderPlate cylinder
914914
Übertragungszylindertransfer cylinder
916916
GegendruckzylinderImpression cylinder
915915
Gummituchblanket
920920
Spüleinheitrinsing unit
930930
Einheit zum BelegenUnit to prove
940940
Reinigungseinheitcleaning unit
950950
Bebilderungseinheitimaging unit
960960
Entwicklungseinheitdevelopment unit
970970
Feuchtwerkdampening
980980
Farbwerkinking
990990
Steuerungseinheitcontrol unit
995995
Verbindungenlinks

Claims (10)

Verfahren zum Behandeln einer wiederbebilderbaren Druckform nach einem Drucken, wobei die Druckform (110) einen mit amphiphilen Molekülen (140) versehenen Träger (120) aufweist und für ein erneutes Drucken im Verlauf eines Wiederbebilderungsvorgangs (600, 700, 750, 800, 200, 250) von Druckfarbe (410) gereinigt (800) und mit amphiphilen Molekülen (710) versehen (700) wird,
dadurch gekennzeichnet,
dass die Druckform (110) im Verlauf des Wiederbebilderungsvorgangs (600, 700, 750, 800, 200, 250) im Wesentlichen vor dem Reinigen (800) von Druckfarbe mit amphiphilen Molekülen (710) versehen (700) wird.A method of treating a re-imageable printing form after printing, wherein the printing form (110) comprises a support (120) provided with amphiphilic molecules (140) and for reprinting during a re-imaging operation (600, 700, 750, 800, 200, 250 ) is cleaned (800) of printing ink (410) and provided with amphiphilic molecules (710) (700),
characterized,
in that the printing form (110) is provided (700) with amphiphilic molecules (710) substantially before the cleaning (800) of printing ink during the re-imaging process (600, 700, 750, 800, 200, 250). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Druckform (110) mit in wässriger Lösung befindlichen amphiphilen Molekülen (710) versehenen (700) wird.Method according to claim 1,
characterized,
in that the printing form (110) is provided with aqueous solution amphiphilic molecules (710) (700). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Druckform (110) mit in wässriger Lösung befindlicher Alcylphosphonsäure und/oder in wässriger Lösung befindlichem Salz von Alcylphosphonsäure versehen (700) wird.Method according to claim 1,
characterized,
in that the printing form (110) is provided with acylphosphonic acid in aqueous solution and / or salt of alcylphosphonic acid present in aqueous solution (700). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Druckform (110) mit in wässriger Lösung befindlichem Alkylphosphat und/oder in wässriger Lösung befindlichem Salz von Alcylphosphat versehen (700) wird.Method according to claim 1,
characterized,
that the printing form (110) provided with befindlichem in aqueous solution alkyl phosphate and / or in aqueous solution befindlichem salt of Alcylphosphat (700). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Druckform (110) im Verlauf des Wiederbebilderungsvorgangs (600, 700, 750, 800, 200, 250) vor und/oder nach dem Versehen (700) mit amphiphilen Molekülen (710) mit Wasser (610, 760), insbesondere mit destilliertem Wasser, gespült (600, 750) wird.Method according to claim 1,
characterized,
that the printing forme (110) during the Wiederbebierungsvorgangs process (600, 700, 750, 800, 200, 250) before and / or after the oversight (700) with amphiphilic molecules (710) with water (610, 760), in particular with distilled Water, rinsed (600, 750) becomes. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Druckform (110) im Verlauf des Wiederbebilderungsvorgangs (600, 700, 750, 800, 200, 250) mit Infrarot-Strahlung (220) bebildert (200) wird.Method according to claim 1,
characterized,
in that the printing form (110) is imaged (200) with infrared radiation (220) during the re-imaging process (600, 700, 750, 800, 200, 250). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Druckform (110) im Verlauf des Wiederbebilderungsvorgangs (600, 700, 750, 800, 200, 250) mit einem Gummiermittel (260) behandelt (250) wird.Method according to claim 1,
characterized,
in that the printing form (110) is treated (250) with a gumming agent (260) in the course of the repainting process (600, 700, 750, 800, 200, 250). Nassoffset-Druckverfahren, wobei eine wiederbebilderbaren Druckform (110), welche einen mit amphiphilen Molekülen (140) versehenen Träger (120) aufweist, zum Einsatz kommt,
gekennzeichnet,
durch ein Verfahren nach einem der vorhergehenden Ansprüche.Wet offset printing method, wherein a re-imageable printing plate (110) having a support (120) provided with amphiphilic molecules (140) is used,
in
by a method according to any one of the preceding claims. Vorrichtung zum Behandeln einer wiederbebilderbaren Druckform nach einem Drucken, wobei die Druckform (110) einen mit amphiphilen Molekülen (140) versehenen Träger (120) aufweist und wobei die Vorrichtung eine Reinigungseinheit (940) zum Reinigen (800) der Druckform (110) von Druckfarbe (410) und eine Einheit (930) zum Belegen (700) der Druckform (110) mit amphiphilen Molekülen (710) aufweist,
dadurch gekennzeichnet,
dass die Vorrichtung eine Steuereinheit (990) aufweist, welche die Einheit (930) zum Belegen (700) der Druckform (110) mit amphiphilen Molekülen (710) derart ansteuert, dass diese im Verlauf eines Wiederbebilderungsvorgangs (600, 700, 750, 800, 200, 250) im Wesentlichen vor der Reinigungseinheit (940) tätig wird.Apparatus for treating a re-imageable printing form after printing, the printing form (110) comprising a support (120) provided with amphiphilic molecules (140), and wherein the apparatus comprises a cleaning unit (940) for cleaning (800) the printing form (110) of ink (410) and a unit (930) for covering (700) the printing form (110) with amphiphilic molecules (710),
characterized,
in that the device has a control unit (990) which activates the unit (930) for covering (700) the printing forme (110) with amphiphilic molecules (710) in such a way that during the re-imaging process (600, 700, 750, 800, 200, 250) operates substantially in front of the cleaning unit (940). Bedruckstoff verarbeitende Maschine, insbesondere Offsetdruckmaschine,
gekennzeichnet durch
wenigstens eine Vorrichtung nach Anspruch 9.Substrate processing machine, especially offset printing machine,
marked by
at least one device according to claim 9.
EP20060101616 2005-03-09 2006-02-14 Method and apparatus for the treatment of a reusable printing plate Not-in-force EP1700709B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510011192 DE102005011192A1 (en) 2005-03-09 2005-03-09 Method and apparatus for treating a reproducible printing form

Publications (3)

Publication Number Publication Date
EP1700709A2 true EP1700709A2 (en) 2006-09-13
EP1700709A3 EP1700709A3 (en) 2011-01-19
EP1700709B1 EP1700709B1 (en) 2012-05-16

Family

ID=36636976

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Country Status (4)

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EP (1) EP1700709B1 (en)
JP (1) JP4970809B2 (en)
CN (1) CN1830682B (en)
DE (1) DE102005011192A1 (en)

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Also Published As

Publication number Publication date
JP2006248225A (en) 2006-09-21
EP1700709B1 (en) 2012-05-16
DE102005011192A1 (en) 2006-09-28
JP4970809B2 (en) 2012-07-11
CN1830682A (en) 2006-09-13
CN1830682B (en) 2012-01-11
EP1700709A3 (en) 2011-01-19

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