EP1476304B1 - Procede et dispositif d'impression, une hydrophilisation du support d'impression s'effectuant grace a des ions libres - Google Patents

Procede et dispositif d'impression, une hydrophilisation du support d'impression s'effectuant grace a des ions libres Download PDF

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Publication number
EP1476304B1
EP1476304B1 EP03717187A EP03717187A EP1476304B1 EP 1476304 B1 EP1476304 B1 EP 1476304B1 EP 03717187 A EP03717187 A EP 03717187A EP 03717187 A EP03717187 A EP 03717187A EP 1476304 B1 EP1476304 B1 EP 1476304B1
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EP
European Patent Office
Prior art keywords
ink
print carrier
print
carrier
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP03717187A
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German (de)
English (en)
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EP1476304A1 (fr
Inventor
Martin Berg
Erich Kattner
Robert Link
Klaus Pachonik
Wolfgang Schullerus
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.)
Canon Production Printing Germany GmbH and Co KG
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Oce Printing Systems GmbH and Co KG
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Publication of EP1476304A1 publication Critical patent/EP1476304A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/006—Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes
    • 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

Definitions

  • the invention relates to a method and a device for producing a printed image on a carrier material, wherein on the surface of the print carrier ink-attracting and ink-repellent regions are generated according to the structure of the printed image to be printed, wherein the ink-repellent regions are provided with a layer of a ink-repellent medium in that ink is applied to the surface of the print substrate, which adheres to the ink-attracting areas and which is not accepted by the ink-repellent areas, and in which the color distributed on the surface is printed on the substrate.
  • a method which is called a direct imaging method in which a printing original is created in the printing device on a multilayer, silicone-coated film by selective burning away of the silicone top layer.
  • the silicone-free areas are the ink-attracting areas that accept printing ink during the printing process. Every new print requires a new foil.
  • hydrophobic and hydrophilic areas are produced on the surface of the print carrier in accordance with the structure of the print image to be printed.
  • a thin film of moisture is first applied to the print substrate using applicator rollers or spray devices, which wets the hydrophilic area of the print substrate.
  • the inking roller transfers ink to the surface of the print substrate, which wets only those areas not covered by the moisture film. After dyeing, the color is finally transferred to the carrier material.
  • a hydrophobic layer is removed by partial burning away and exposing a hydrophilic layer.
  • the hydrophilic layer can be wetted with an ink-repellent fountain solution.
  • the hydrophobic areas are ink accepting and can absorb ink during the printing process.
  • a new printing plate must be used.
  • the wetting of the printing plate with the ink-repelling dampening solution is achieved by targeted roughening and structuring of the plate surface.
  • the resulting increase in surface area and porosity produces microcapillaries and leads to an increase in the effective surface energy and thus to a good wetting or spreading of the dampening solution.
  • wetting-promoting substances are added to the wetting agent during offset printing. These reduce the surface tension of the fountain solution, which also leads to improved wetting of the surface of the print carrier.
  • a hydrophilization is carried out in which the surface is exposed to free ions. It becomes a corona process used. Exposure to free ions increases the surface energy, thereby improving wetting with a fountain solution, preferably water-based. Accordingly, the fountain solution can be applied very thin and subsequent structuring in digital printing can be done with reduced energy. These measures ensure a high print quality and the effort for digital structuring is reduced.
  • the printing device of claim II is specified, by which the described method can be realized. Preferred embodiments are mentioned in the dependent claims to the method and to the printing device.
  • color repellent or ink-receptive layer occurs.
  • This layer is adapted to the applied color.
  • the fountain solution layer is color-repellent.
  • this fountain solution layer is color-attracting.
  • oily inks are used, so that a water-containing fountain solution layer is ink repellent.
  • FIG. 1 is a schematic representation of a printing device shown, which is constructed similar to that in the US Patent No. 5,067,404 the same applicant is described.
  • a print carrier 10 in the present case an endless Band, is passed through a pretreatment device 12, which includes a scoop roller 14 and an applicator roll 16.
  • the scoop roller 14 immersed in a liquid contained in a container 13, which contains a wetting-promoting substance.
  • On the surface of the print carrier 10 is applied over the applicator roll 16, this substance containing surfactant in a molecular layer thickness.
  • the layer thickness is typically less than 0.1 ⁇ m.
  • the surface of the print carrier 10 is then guided in the direction of arrow P1 to a dampening unit 18, which applies a ink-repelling or ink-attracting dampening solution, for example water, from a dampening solution reservoir 24 to the surface of the print substrate 10 via a scoop roller 20 and an applicator roller 22.
  • dampening solutions other than water can also be used.
  • the order of the fountain solution layer can also be done by other methods, for example by steaming or spraying.
  • the pressure-active surface of the print carrier 10 is completely provided with this fountain solution layer.
  • the fountain solution layer typically has a layer thickness of less than 1 ⁇ m.
  • the generally ink-repellent fountain solution layer is then patterned by an imaging device 26.
  • laser radiation 28 is used for this purpose.
  • ink-attracting regions and ink-repelling regions are formed according to the structure of the printed image to be printed.
  • the structured dampening solution layer reaches an inking unit 30, which transfers ink from a storage container 38 onto the surface of the print carrier 10 with the aid of the rollers 32, 34, 36.
  • the oil-containing color deposits on areas without water-containing dampening solution.
  • the ink can also be transferred to the surface of the print carrier 10 by spraying, knife coating or condensing.
  • a transfer to a carrier material 40 Upon further transport of the print carrier 10, a transfer to a carrier material 40, generally a paper web.
  • the carrier material 40 is passed between two rollers 42, 44.
  • a blanket cylinder (not shown) and further intermediate cylinders can be connected between the roller 42 and the print carrier 10, which effect a color split, as is known per se from the field of offset printing methods.
  • the surface of the print carrier 10 is cleaned in a cleaning station 46.
  • the cleaning station 46 includes a brush 48 and a wiper lip 50, which are brought into contact with the surface of the print carrier 10.
  • the cleaning can be assisted by using ultrasound, high pressure liquid and / or steam.
  • the cleaning can also be done using cleaning fluids and / or solvents.
  • a new application of the wetting-promoting substance e.g. a surfactant, and a fountain solution and re-structuring done.
  • a new print image can be printed.
  • the cleaning device 46, the device 12 and the device 26 are then switched inactive.
  • the still present in color residues print image is then colored again by the inking unit 30 and reprinted. In this mode, therefore, a plurality of identical printed images can be printed.
  • FIG. 2 schematically shows a cross section through the print carrier 10 before and after structuring using the laser beam 28.
  • the wetting is conveyed to the print substrate surface 10 by the application of a wetting-promoting substance. This happens within the printing cycle before the application of the ink-repellent dampening solution. Due to its physical and chemical properties, the wetting-promoting substance can be applied to the surface as an extremely thin layer of a few molecule layers, preferably smaller than 0.1 .mu.m. This layer is sufficient to favor on its free surface, the wetting with the ink-repellent fountain solution, so that this can also be applied as a very thin layer 54, preferably less than 1 micron.
  • the continuing printing process is not affected by the small amount of wetting-promoting substance, in this case a surfactant layer 52. It can be easily removed by the cleaning process integrated in the printing cycle.
  • the wetting-promoting layer 52 can be dispensed with the otherwise roughened, porous printing plate surface. Instead, a smooth surface of the print carrier 10 is possible to clean with significantly less effort. A fast and stable cleaning process is indispensable for such a digital lithographic printing process or offset printing process and a decisive factor for its effectiveness. Accordingly, the surface of the print carrier 10 has a roughness which is smaller than the roughness used in the standard offset printing process. Typically, the mean roughness R z is less than 10 microns, preferably less than 5 microns. Expressed as the average roughness value R a , the roughness value lies in the range of less than 2 ⁇ m, preferably less than 1 ⁇ m.
  • a change in the molecular or atomic structure of the material of the print carrier and a permanent and firmly anchored to the surface of the print carrier wetting-promoting layer is not necessary.
  • the additionally applied wetting-promoting substance proposed here for example the surfactant layer 52, develops its wetting-promoting action even at very low levels. Accordingly, its influence on the characteristics of the print substrate 10 is negligible in many respects.
  • the dampening agent layer 54 and the surfactant layer 52 are removed by the laser beam 28 in accordance with the required image structure. These areas are then colored by the inking unit 30 with color. Due to the very smooth surface of the print carrier 10, the cleaning is facilitated, the surfactant layer 52 is completely removed again. Furthermore, the wear of the surface of the print carrier 10 is reduced.
  • FIG. 3 takes place in contrast to example after FIG. 1 before applying the ink-repellent or ink-receptive layer on the usable surface of the print carrier structuring of a hydrophilic layer having a molecular layer thickness.
  • a steam device 60 is used, which acts on the surface of the print carrier 10 with hot water vapor.
  • the print carrier 10 is provided on its surface with a SiO 2 coating. After the steam treatment, the print carrier 10 is dried by a suction device 62.
  • the hot water vapor generates a hydrophilic molecular structure on the outer surface, for example SiOH.
  • hydrophilic regions and hydrophobic regions arise in accordance with the structure of the printed image to be printed.
  • the downstream dampening unit 18 the entire usable surface of the print carrier 10 is brought into contact with a fountain solution layer, wherein the dampening agent attaches only to the hydrophilic areas, so that ink-attracting areas and ink-repellent areas arise in accordance with the structuring.
  • a paint is applied by the inking unit 30, wherein the oil-containing color attaches to areas without aqueous dampening solution.
  • the transfer printing of the printed image onto the carrier material 40 takes place.
  • the hydrophilic layer is patterned on the surface of the print carrier 10 according to the printed image.
  • the hydrophilic layer is extremely thin and only a few nanometers, typically less than 4 nm. It can therefore be patterned with very little energy expenditure during a printing cycle, whereby the hydrophilic molecular layer disappears.
  • the fountain solution which produces a moisture film only on the non-hydrophilic areas.
  • Dyeing and transfer printing takes place according to the described known principles of planographic printing or offset printing. After cleaning, in addition to the color residues and the hydrophilic layer are removed but may not necessarily be removed, the printing cycle may begin again.
  • the hydrophilic layer is regenerated or reapplied, and then the hydrophilic layer is patterned according to the new image data.
  • the hydrophilic layer is formed by activating the surface of the print substrate and by suitably changing the outer molecular surface structure.
  • this can be made possible by the use of chemical activators, reactive gases and / or a suitable energy supply.
  • water vapor as in the example below FIG. 3 can also be formed by the action of hot water and by leaching, such as NaOH, a hydrophilic SiOH structure on the surface.
  • the print carrier is to be provided for this purpose with a SiO2 coating. It is also possible for the print carrier to pass through an activator bath to produce hydrophilization of the surface. It is also possible to order an activator via a nozzle system. Another possibility is to produce the hydrophilic layer by flaming the surface of the print carrier 10. Here too, wetting-promoting surface structures in a molecular layer thickness are formed.
  • An advantageous arrangement is the combination of hydrophilization with cleaning.
  • Both the cleansing and the hydrophilizing effect of a hot water jet or a hot steam jet can be used.
  • the cleaning and the production of the hydrophilic layer are then carried out in a single process step.
  • a wetting-promoting substance is applied to the surface of the print carrier to produce the hydrophilic layer applied.
  • pretreatment device 12 can be used.
  • a liquid which contains a wetting-promoting substance for example a surfactant, are applied in a molecular layer thickness.
  • the layer thickness is typically less than 0.1 microns.
  • a further wetting-promoting substance are also alcohols into consideration.
  • the job can alternatively be done by doctoring, spraying and vapor deposition.
  • the partial removal of this hydrophilic layer can be done by local thermal energy supply. Due to the small layer thickness, the energy consumption can be low.
  • LEDs, LED combs or heating elements can be used.
  • FIGS. 3 and 4 can be done per circulation of the print carrier 10, a re-structuring, whereby each circulation a new print image is printed.
  • the devices for the restructuring are then switched inactive.
  • FIG. 5 shows a cross section through the print carrier 10 before and after patterning by the laser beam 28 for the example FIG. 4 ,
  • the surface of the print substrate 10 is very smooth, as is the case with the previous examples.
  • the thin surfactant layer 52 is patterned by the laser beam 28, ie, hydrophilic regions 68 and hydrophobic regions 64 are produced.
  • the dampening unit 18 is a thin water-containing Wet film applied only to the hydrophilic areas.
  • the regions 64 are then colored by the inking unit 30 with an oily color which is repelled by the fountain solution 54 in the region of the hydrophilic regions 68.
  • the surface energy of the print substrate 10 must be at least as high as the surface tension of the dampening solution film. This means that the value of the contact angle between the surface of the print carrier 10 and the fountain solution must have a value below 90 °. In practice, it is necessary that a contact angle of ⁇ 25 ° must be achieved in order to produce the required liquid film with a thickness of about 1 micron. This places a high demand on the surface energy of the print carrier, which, especially when taking into account the extremely high surface tension value of water, namely 72 mN / M, as the basis of the ink-repellent fountain solution.
  • Plastic print carrier or metallic print carrier can do this without further measures, such as roughening, application of surfactants, production of microcapillaries, etc., not afford.
  • the contact angle of water to polyimide or polycarbonate is about 75 °.
  • metal surfaces, which in their purest form have very high surface energies and thus smallest contact angles, exhibit relatively hydrophobic behavior under normal environmental conditions. This is essentially due to the fact that the oxidation layer is effective on metal surfaces and always forms under normal conditions. Even the slightest impurities have a negative effect in this context for the desired surface energy. Contact angles of over 70 ° are hereby frequently encountered in practice.
  • a corona treatment of the surface of the print carrier 10 is carried out.
  • a high voltage generator 70 generates an AC voltage in the range of 10 to 30 kV, preferably in the range of 15 to 20 kV, at a frequency of 10 to 40 kHz, preferably in the range of 15 to 25 kHz.
  • An output terminal of the high voltage generator 70 is connected to an insulated electrode 72.
  • the other output terminal is placed in the present case of a metallic print carrier 10 to a sliding contact 74 which is connected to the print carrier 10.
  • the relatively high voltage at the electrode 72 leads to the ionization of the air.
  • the result is a corona discharge, wherein the surface of the print carrier 10 is bombarded with free ions.
  • the cleaning effect is in the foreground, whereby an increase in the surface energy and thus a reactivation of the hydrophilic properties of metals is achieved by degreasing the surface and removing the oxide layer. In this way, contact angles to water of up to less than 20 ° in plastic surfaces and metal surfaces can be achieved.
  • the corona treatment previously alters the physical surface properties of the support, but not its mechanical properties. There are no visible changes eg detectable with a scanning electron microscope.
  • the hydrophilization can be improved by supplying process gases, preferably oxygen or nitrogen.
  • FIG. 6 is like the example after FIG. 1 applied to the hydrophilized surface of the print carrier 10 in the dampening unit 18 a fountain solution; This is followed by structuring with the aid of laser radiation 28.
  • the structured fountain solution layer is inked by the inking unit 30 and the ink is later transferred to the carrier material 40.
  • paint residues are removed. Since the surface of the print carrier 10 is also very smooth as in the previous example, the cleaning process is easy to implement and with high efficiency. Following this, the cyclical printing process can start anew. Alternatively, a restructuring can also be omitted and the previous print image is dyed and reprinted again.
  • FIG. 7 shows the insulated electrode 72.
  • a metallic core 76 is surrounded by a ceramic shell 78.
  • electrical flashovers are prevented. This is especially advantageous if 10 metal is used as the print carrier.
  • the insulation can also be produced by a plastic jacket.
  • FIG. 8 shows the structure of a print carrier 10 made of plastic.
  • An electrode plate 80 is disposed on the side of the print carrier 10 opposite to the electrode 72.
  • the electrode 72 may be made without isolation.
  • FIG. 9 shows a hydrophilization process with an indirect corona treatment.
  • the output terminals of the high voltage generator 70 are connected to two electrodes 82, 84, which are arranged above the print carrier 10.
  • the electrical discharges generated by the high voltage between the two electrodes 82, 84 generate ions which are conducted by an air stream or process gas stream to the surface of the print carrier 10 and here develop the wetting-promoting effect.
  • a blower 86 is used to generate the flow.
  • a low-pressure plasma treatment which increases the surface energy at the surface of the print carrier 10.
  • a high-voltage discharge is generated under vacuum conditions, for example in the range of 0.3 to 20 mbar, is ionized by the process gas and is added to the plasma state. This plasma comes into contact with the surface of the print substrate 10.
  • the effect of the plasma is comparable to the effect of corona treatment.
  • the layer thickness is typically in the range of 1 ⁇ m.
  • the described hydrophilization process offers various advantages. It is possible to dispense with the roughened porous printing plate surface as in the standard offest printing method. Instead, a very smooth surface is possible whose roughness range is very low, for example in a region of the average roughness value R a ⁇ 1 ⁇ m. This allows a quick and stable cleaning process for the surface.
  • the print carrier can be optimized without regard to the surface energy with regard to further requirements.
  • the described hydrophilization process also allows the waiver of the wetting-promoting additives used in offset printing for dampening solution. Another order of additional wetting-promoting substances is no longer required. This avoids a relatively complicated process management and reduces the overhead of consumables. Another advantage lies in the cleaning effect of the hydrophilization process. It supports the cleaning process necessary for the digital printing process and thus further reduces the required hardware expenditure.
  • FIG. 10 shows a further embodiment.
  • the constant and well-defined thickness of the dampening solution layer on the surface of the print carrier plays a crucial role for the stability and efficiency of the printing process.
  • a printing device is described which allows and monitors a defined, controllable and controllable very thin application of dampening solution.
  • the standardized offset printing process usually uses a dampening system consisting of a number of rotating rollers for the application of the dampening solution. Together with a roughened or porous well-water pressure plate results in a sufficiently stable for standard offset printing water film.
  • the amount of dampening solution and the thickness of the fountain solution layer can be, for example, the delivery of certain rollers to each other or set the speed of the scoop roller.
  • the storage effect of the dampening unit and also the pressure plate leads to a strong delaying response to adjustment measures.
  • the roughened, strongly water-storing printing plates are essential.
  • the thickness of the water film is highly dependent on the ambient conditions, such as humidity and temperature, and is to be kept constant over a long period of time.
  • FIG. 10 a structure is used which is similar to that in the aforementioned DE-A-101 32 204 described structure which realizes a CTP (Computer-To-Press) method.
  • CTP Computer-To-Press
  • the printing device allows to produce 10 different printed images on the same surface of the cylindrical print carrier.
  • the printing device includes the inking unit 30, with a plurality of rollers, is transferred by the oily ink from the reservoir 38 to the surface of the print carrier 10.
  • the inked surface of the print carrier 10 transfers the ink to a blanket cylinder 90. From there, the ink reaches the paper web 40, which is pressed by the impression cylinder 42 against the blanket cylinder 90.
  • the dampening unit 18 transfers dampening solution, eg water, from the dampening solution reservoir 24 onto the surface of the print carrier 10 via three rollers.
  • the surface of the print carrier 10 can be coated using wetting agents and / or surfactants or by corona and / or Plasma treatment be brought into a more hydrophilic state, as above has already been described.
  • the dampening solution layer is selectively removed by supplying energy by means of a laser beam 28 and there is the desired image structure.
  • the inking by the inking unit 30 then takes place at the ink-attracting areas of the structuring. After patterning, the color may be solidified using a fuser 92.
  • a large number of printing processes take place before the surface is restructured.
  • the print image located on the print carrier 10 is inked and reprinted once per print, ie there is a multiple inking of the printed image.
  • a second mode a new print image is applied to the surface of the print carrier.
  • This cleaning station can be pivoted to the print carrier 10 according to the arrow P2 and swung away from it again. Further details of the structure of the printing device after FIG. 10 are in the mentioned DE-A-101 32 204 described.
  • an energy source 94 which emits heat energy to the dampening solution film on the surface of the print carrier 10. This energy reduces the thickness of the fountain solution layer.
  • the energy source is followed by a layer thickness measuring device 96.
  • This layer thickness measuring device 96 determines the actual thickness of the dampening solution film and outputs an electrical signal corresponding to the thickness to a controller 98.
  • the controller 98 compares the measured actual thickness with a predetermined target thickness. With a nominal-actual value deviation, the energy source 94 is activated in such a way that that the thickness of the fountain solution layer to the desired. Target thickness is reduced.
  • the layer thickness measuring device 96 can operate without contact, for example, according to the triangulation method, the transmission method or the capacitive method.
  • energy source 94 is one or more IR lamps, radiant heaters, laser systems, laser diodes or heating elements into consideration.
  • the interaction of the energy source 94, the Schichtdikkenmeß réelles 96 and the controller 98 may be such that only a monitoring function is performed. If the layer thickness exceeds or falls below a predetermined desired value, then a corresponding warning signal is emitted and then the energy supply for the energy source 94 is readjusted. However, the energy source 94, the Schichtdickenmeß réelle 96 and the controller 98 may also be combined to form a control loop in which the energy source 94 is driven so that at a control deviation between the actual value and target value of the layer thickness minimizes this deviation and preferably to zero is regulated.
  • the power source 94 may be driven by the controller using analog voltage regulation or digitally by pulse modulation, as indicated by the signal sequence 100.
  • a thick-constant dampening solution film is produced, which is reduced in its layer thickness defined in a subsequent second step.
  • the result is a uniform fountain solution layer with a defined and very small thickness.
  • the subsequent structuring can thus be done with minimal energy and with consistent results be performed. Overall, the print quality is thus increased.
  • the advantages of the printing device shown are that a direct reaction to a change in the layer thickness of the fountain solution layer can be made that a known and defined thickness of the dampening solution layer can be adjusted and that extremely thin fountain solution layers can be produced. Furthermore, the required structuring energy can be minimized, in particular for digital printing methods.
  • both an endless belt and a cylinder can be used as the print carrier.
  • the transfer to the substrate can be done directly or with the interposition of a blanket cylinder or other intermediate cylinders for a color separation.
  • the layer thickness control according to the example according to FIG. 10 can also be used for the other examples.
  • a fixation of the applied color by means of a fixing device.
  • the cleaning station 46, the dampening unit 18 and the image forming device can be switched inactive and active, for example by pivoting.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Ink Jet (AREA)

Claims (20)

  1. Procédé de production d'une image d'impression sur un matériau de support (40), dans lequel :
    la surface d'un support d'impression (10) est enduite d'une couche (54) d'un agent mouillant repoussant l'encre ou acceptant l'encre,
    au moyen d'un processus de structuration utilisant un faisceau, des zones acceptant l'encre et des zones repoussant l'encre sont ensuite produites sur la surface du support d'impression (10), en fonction de la structure de l'image d'impression à imprimer,
    sur la surface portant la couche structurée d'agent mouillant est appliquée de l'encre qui adhère aux zones acceptant l'encre et qui n'est pas acceptée par les zones repoussant l'encre,
    l'encre appliquée est ensuite transférée sur le matériau de support (40),
    la surface du support d'impression (10) est nettoyée et à nouveau structurée avant un nouveau processus de structuration,
    avant l'application de l'agent mouillant sur la surface du support d'impression (10) est effectuée une hydrophilisation au cours de laquelle la surface est soumise à des ions libres,
    on utilise pour la production des ions libres un procédé corona avec une tension alternative de l'ordre de 10 à 30 kV,
    et la surface du support d'impression (10) présente une rugosité dont la valeur de rugosité moyenne Ra est inférieure à 2 µm.
  2. Procédé selon la revendication 1, dans lequel la surface du support d'impression (10) présente une rugosité dont la valeur de rugosité moyenne Ra est inférieure à 1 µm.
  3. Procédé selon la revendication 1 ou 2, dans lequel la tension alternative pour le procédé corona est de l'ordre de 15 à 20 kV.
  4. Procédé selon la revendication 2 ou 3, dans lequel la tension alternative présente une fréquence comprise entre 10 et 40 kHz, et de préférence de l'ordre de 15 à 25 kHz.
  5. Procédé selon l'une des revendications précédentes, dans lequel la surface est en outre soumise à des gaz de process, de préférence de l'oxygène et/ou de l'azote.
  6. Procédé selon l'une des revendications précédentes, dans lequel on utilise par ailleurs pour la production des ions libres un procédé plasma à basse pression, dans lequel un gaz de process est ionisé, et le gaz de process est amené à la surface du réservoir de pression.
  7. Procédé selon l'une des revendications précédentes, dans lequel le film d'agent mouillant sur la surface du support d'impression présente une épaisseur inférieure ou égale à 1 µm.
  8. Procédé selon l'une des revendications précédentes, dans lequel on utilise le faisceau d'un système laser, d'un laser, de diodes laser, de LED, ou d'une barrette de diodes laser.
  9. Procédé selon l'une des revendications précédentes, dans lequel une séparation de l'encre est effectuée avant le transfert de l'encre sur le matériau de support (40).
  10. Procédé selon l'une des revendications précédentes, dans lequel la surface du support d'impression (10) est une surface enveloppante de cylindre ou une bande sans fin.
  11. Dispositif de production d'une image d'impression sur un matériau de support (40), comprenant un support d'impression (10),
    dans lequel sont prévus des moyens par lesquels
    la surface d'un support d'impression (10) est enduite d'une couche (54) d'un agent mouillant repoussant l'encre ou acceptant l'encre,
    au moyen d'un processus de structuration utilisant un faisceau, des zones acceptant l'encre et des zones repoussant l'encre sont ensuite produites sur la surface du support d'impression (10), en fonction de la structure de l'image d'impression à imprimer,
    sur la surface portant la couche structurée d'agent mouillant est appliquée de l'encre qui adhère aux zones acceptant l'encre et qui n'est pas acceptée par les zones repoussant l'encre,
    l'encre appliquée est ensuite transférée sur le matériau de support (40),
    la surface du support d'impression (10) est nettoyée et à nouveau structurée avant un nouveau processus de structuration,
    avant l'application de l'agent mouillant sur la surface du support d'impression (10) est effectuée une hydrophilisation au cours de laquelle la surface est soumises à des ions libres,
    un dispositif corona (70, 72) présentant une tension alternative de l'ordre de 10 à 30 kV étant prévu pour la production des ions libres,
    et la surface du support d'impression (10) présentant une rugosité dont la valeur de rugosité moyenne Ra est inférieure à 2 µm.
  12. Dispositif selon la revendication 11, dans lequel la surface du support d'impression présente une rugosité dont la valeur de rugosité moyenne Ra est inférieure à 1 µm.
  13. Dispositif selon la revendication 11 ou 12, dans lequel la tension alternative du dispositif corona (70, 72) est de l'ordre de 15 à 20 kV.
  14. Dispositif selon l'une des revendications 11 à 13, caractérisé en ce que la tension alternative présente une fréquence de 10 à 40 kHz, et de préférence de l'ordre de 15 à 25 kHz.
  15. Dispositif selon l'une des revendications précédentes, dans lequel la surface est en outre soumise à des gaz de process, de préférence de l'oxygène et/ou de l'azote.
  16. Dispositif selon l'une des revendications précédentes, dans lequel dans lequel on utilise par ailleurs pour la production des ions libres un procédé plasma à basse pression, dans lequel un gaz de process est ionisé, et le gaz de process est amené à la surface du réservoir de pression.
  17. Dispositif selon l'une des revendications précédentes, dans lequel le film d'agent mouillant sur la surface du support d'impression présente une épaisseur inférieure ou égale à 1 µm.
  18. Procédé selon l'une des revendications précédentes, dans lequel on utilise le faisceau d'un système laser, d'un laser, de diodes laser, de LED, ou d'une barrette de diodes laser.
  19. Procédé selon l'une des revendications précédentes, dans lequel une séparation de l'encre est effectuée avant le transfert de l'encre sur le matériau de support (40).
  20. Procédé selon l'une des revendications précédentes, dans lequel la surface du support d'impression (10) est une surface enveloppante de cylindre ou une bande sans fin.
EP03717187A 2002-02-19 2003-02-18 Procede et dispositif d'impression, une hydrophilisation du support d'impression s'effectuant grace a des ions libres Expired - Lifetime EP1476304B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10206946A DE10206946A1 (de) 2002-02-19 2002-02-19 Verfahren und Einrichtung zum Drucken, wobei eine Hydrophilisierung des Druckträgers durch freie Ionen erfolgt
DE10206946 2002-02-19
PCT/EP2003/001623 WO2003070463A1 (fr) 2002-02-19 2003-02-18 Procede et dispositif d'impression, une hydrophilisation du support d'impression s'effectuant grace a des ions libres

Publications (2)

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EP1476304A1 EP1476304A1 (fr) 2004-11-17
EP1476304B1 true EP1476304B1 (fr) 2008-10-29

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EP03717187A Expired - Lifetime EP1476304B1 (fr) 2002-02-19 2003-02-18 Procede et dispositif d'impression, une hydrophilisation du support d'impression s'effectuant grace a des ions libres

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EP (1) EP1476304B1 (fr)
AT (1) ATE412514T1 (fr)
DE (2) DE10206946A1 (fr)
WO (1) WO2003070463A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1591268A1 (fr) * 2004-04-26 2005-11-02 CHIORINO S.p.A. Procédé du traitement d'une couche d'impression d'un blanchet d'impression ou d'une plaque de vernissage
DE102018115486A1 (de) 2018-06-27 2020-01-02 Océ Holding B.V. Digitales Druckverfahren

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5535278B2 (fr) * 1974-03-18 1980-09-12
JPS58168562A (ja) * 1982-03-29 1983-10-04 ハリス・グラフィックス・コ−ポレ−ション 刷版製作方法及び装置
US4777109A (en) * 1987-05-11 1988-10-11 Robert Gumbinner RF plasma treated photosensitive lithographic printing plates
DE3871398D1 (de) 1988-02-26 1992-06-25 Siemens Nixdorf Inf Syst Verfahren und vorrichtung zum drucken durch einfaerben eines latenten bildes.
JPH02265795A (ja) * 1989-04-06 1990-10-30 Asahi Chem Ind Co Ltd オフセット印刷用版材の改良された製法
US5379698A (en) 1992-07-20 1995-01-10 Presstek, Inc. Lithographic printing members for use with laser-discharge imaging
US5816161A (en) * 1994-07-22 1998-10-06 Man Roland Druckmaschinen Ag Erasable printing plate having a smooth pore free metallic surface
JP2000507512A (ja) * 1996-03-29 2000-06-20 オーセ プリンティング システムズ ゲゼルシャフト ミット ベシュレンクテル ハフツング キャリア材料に印刷するための印刷法
US6295928B1 (en) * 1997-01-27 2001-10-02 OCé PRINTING SYSTEMS GMBH Method and device for printing on a carrier material using a structured ice layer
DE69703879T2 (de) * 1997-07-04 2001-08-02 Agfa-Gevaert N.V., Mortsel Verfahren zur Behandlung eines Trägers und Verwendung des Trägers in einer lithographischen Druckplatte
DE19826377A1 (de) * 1998-06-12 1999-12-16 Heidelberger Druckmasch Ag Druckmaschine und Druckverfahren
ATE254534T1 (de) 1998-09-21 2003-12-15 Presstek Inc Lithographische druckplatten zum gebrauch in einem laser-bilderzeugungsgerät
US6146798A (en) * 1998-12-30 2000-11-14 Xerox Corporation Printing plate with reversible charge-controlled wetting
EP1080942B2 (fr) * 1999-08-31 2009-10-14 Agfa Graphics N.V. Méthode de régénération d'une plaque d'impression lithographique
ATE486717T1 (de) * 2001-07-03 2010-11-15 Oce Printing Systems Gmbh Verfahren und einrichtung zum erzeugen unterschiedlicher druckbilder auf demselben druckträger
DE10132204A1 (de) * 2001-07-03 2003-01-30 Oce Printing Systems Gmbh Verfahren und Vorrichtung zum Erzeugen unterschiedlicher Druckbilder auf demselben Druckträger

Also Published As

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DE10206946A1 (de) 2003-09-04
EP1476304A1 (fr) 2004-11-17
DE50310698D1 (de) 2008-12-11
WO2003070463A1 (fr) 2003-08-28
ATE412514T1 (de) 2008-11-15

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