EP1245385A2 - Plaque d'impression offset comprenant un matériau photo-thermo convertible, procédé et dispositif pour créer et/ou effacer l'image de la plaque d'impression offset - Google Patents

Plaque d'impression offset comprenant un matériau photo-thermo convertible, procédé et dispositif pour créer et/ou effacer l'image de la plaque d'impression offset Download PDF

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Publication number
EP1245385A2
EP1245385A2 EP02405245A EP02405245A EP1245385A2 EP 1245385 A2 EP1245385 A2 EP 1245385A2 EP 02405245 A EP02405245 A EP 02405245A EP 02405245 A EP02405245 A EP 02405245A EP 1245385 A2 EP1245385 A2 EP 1245385A2
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EP
European Patent Office
Prior art keywords
printing form
layer
photocatalytically
offset printing
wet offset
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
EP02405245A
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German (de)
English (en)
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EP1245385B1 (fr
EP1245385A3 (fr
Inventor
Matthias Riepenhoff
Olivier Stehlin
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.)
Wifag Maschinenfabrik AG
Original Assignee
Wifag Maschinenfabrik AG
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Publication of EP1245385A2 publication Critical patent/EP1245385A2/fr
Publication of EP1245385A3 publication Critical patent/EP1245385A3/fr
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Publication of EP1245385B1 publication Critical patent/EP1245385B1/fr
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41CPROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00Forme preparation
    • B41C1/10Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1041Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by modification of the lithographic properties without removal or addition of material, e.g. by the mere generation of a lithographic pattern
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING 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
    • B41N3/00Preparing for use and conserving printing surfaces
    • B41N3/006Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/70Forming the printing surface directly on the form cylinder

Definitions

  • the invention relates to a wet offset printing form with a surface that with a Print image is imageable or illustrated, this surface of a material is formed, which is a photocatalytically and thermally changeable material as part of contains even distribution or consists solely of such a material.
  • a Photocatalytically and thermally changeable material is used in the sense of the invention Material understood that by irradiation with light photocatalytically into a hydrophilic State and thermally, namely by heating, can be brought into a lipophilic state is.
  • the invention further relates to a method for generating the printed image, i.e.
  • the invention particularly preferably relates to a method and a device for imaging and erasing a printing form, for example for a Repeated imaging of the same printing form with different printing images.
  • the printing form, the method and the device are preferably used in Wet offset web-fed rotary printing, especially in newspaper printing.
  • an image is understood to mean a process in which the Printing form is acted on at the points that form the pixels, so that a latent Image is generated on the printing form.
  • a deletion is within the meaning of the invention understood a process in which the printing form is preferably not image-dependent but is treated over the whole area in such a way that the image information applied during the imaging, i.e. the printed image is eliminated.
  • the influence on the imaging is preferably an image-based heating, but in principle can also be image-based Be irradiated with UV light.
  • Newspapers are mainly produced using wet offset.
  • Printing machines like the invention it preferably concerns, typically contain printing units with blanket cylinders, Plate cylinders, inking units and dampening units.
  • One on a printing form cylinder stretched printing form has a surface mostly in the form of an upper layer, the in the illustrated state, hydrophilic (water-friendly) and lipophilic (water-repellent) Areas.
  • the printing form is usually formed by a printing plate, which is clamped on a plate cylinder designed as a plate cylinder.
  • the printing form has imagewise applied lipophilic areas.
  • the non-image areas are hydrophilic and bind water more strongly than color.
  • the lipophilic areas repel water and therefore look color-friendly.
  • any surface can be used for the offset process can be used, which can be divided into hydrophilic and lipophilic areas.
  • a large number of methods and devices are used to produce printing forms known using appropriate printing forms. You can, for example, with irradiate a printing form imagewise with a laser and then develop it chemically. Printing forms can also be produced by laser ablation. Doing so either lipophilic areas under a hydrophilic layer or hydrophilic areas under a lipophilic layer exposed.
  • the exposure process relevant for image generation can be done either in a separate system or within the press, as the invention prefers.
  • the outer drum principle is known for exposure or imaging in the printing press. Usually come so-called process-free Printing forms that do not require chemical development are used.
  • Printing forms used today are used only once. From economic and for ecological reasons it is desirable to use the same printing form several times to be able to use.
  • EP 0 911 155 A1 describes the imaging of a printing form by a photocatalytic one Known reaction.
  • the hydrophilic non-image areas are used to generate the printed image irradiated with UV laser light.
  • the printing form exposed in this way and thereby illustrated becomes extinguished by heating.
  • the printing form must reach a high temperature.
  • a cleaning process for deleting the printed image after using the printing form with a cleaning device required to remove the paint residue from the Remove printing form. Without cleaning, heating the printing form would result in erasure cause burnt-in ink residues in the printing plate surface of the print image, which would make the printing form unusable.
  • EP 0 911 154 A1 describes the imaging by image-wise heating and the Deletion by UV radiation. Further details are given in EP 1 020 304 A2 described.
  • the printing form does not have to be used specifically for deleting the Print image to be cleaned.
  • the illustration of a printing form and / or the deletion of a printed image of a printing form should or should be facilitated, preferably in one Wet offset press.
  • the invention is based on the idea of local Wetting behavior, i.e. the hydrophilic or lipophilic behavior of a printing form, thereby achieving that the atoms or molecules of a photocatalytic and thermal changeable material, which is the imageable or illustrated surface of the printing form from an excited state in which they are normally through the Imaging can be converted into a low-energy state.
  • a photocatalytic and thermal changeable material which is the imageable or illustrated surface of the printing form from an excited state in which they are normally through the Imaging can be converted into a low-energy state.
  • the printing form is thus before performing a Imaging process or after performing a deletion process in one initial hydrophilic state, characterized by a local, imagewise, preferred temporary, heating of the photocatalytically and thermally changeable material in the lipophilic and hydrophilic usage state is transferred according to the image.
  • An advantage of this type of imaging is that the unimaged printing form is easy to use Daylight can be handled.
  • the deletion of the printed image and not that Imaging takes place through the action of natural or artificial daylight or UV light, preferably on the surface having the printed image the whole area.
  • the loss of an image in the installed state is Printing form unlikely, since the printing machine no longer has daylight on the Printing form that would fear deletion to a relevant extent.
  • Yet an advantage lies in the self-cleaning properties of the photocatalytic and thermally changeable material formed surface, which in the deletion of the image comes into play.
  • the surface of the printing form is not only hydrophilic but also organic residues are also catalytically oxidized.
  • a full-surface heating to the required high Temperatures can only be achieved with much greater effort within the printing press as an irradiation with daylight or UV light.
  • daylight has short-wave, ultraviolet (UV) light, which the Normally existing hydrophilicity of the photocatalytically and thermally changeable Material causes.
  • UV ultraviolet
  • the printing form By imaging the printing form by image-wise local radiation, preferably Laser irradiation, not the entire printing form, but only a near surface Depth area of the printing form locally warmed briefly.
  • the printing form as a whole remains to ambient temperature, which generally corresponds to the usual room temperature.
  • a printing form according to the invention has in an upper layer, on the surface of which Print image is generated, absorption centers for radiation to pass through absorption to generate heat from this radiation in the upper layer.
  • the absorption centers become formed by particles of a material that absorbs light, preferably infrared light (IR), which extends into the visible range, i.e. into the near infrared range (NIR) can extend.
  • IR infrared light
  • NIR near infrared range
  • the absorbent material is in fine particles in the photocatalytic and thermally changeable material evenly dispersed.
  • the particles of the Absorbent material is preferably nanoparticles, i.e. around particles, whose maximum spatial extension is in the nano range.
  • Photo-catalytically and photothermally changeable material created.
  • the well-known namely, photocatalytic materials are transparent. The transparency is immediate follow the band structure of the material. In fact, there is a band gap of more than 3 eV required to excite the photocatalytic material into a state effect in the binding of OH groups to the surface of the concerned Material is possible. At this bandgap energy, i.e. Band gap energy, however an interaction with low-energy, long-wave photons is not possible.
  • the known photocatalytic semiconductors are therefore transparent in the visible range.
  • a photothermal effect and change of the photocatalytic material can therefore can only be brought about indirectly.
  • the invention creates a photocatalytic and photothermally changeable material due to the fine distribution of the absorption centers in the photo-catalytically and thermally changeable material.
  • Semiconductors are special preferred examples of materials for forming the absorption centers.
  • the upper layer which forms the surface to be imaged or already imaged, comprises thus a material that interacts photocatalytically with light and the absorption centers, those in the photo-catalytically interacting material, hereinafter also simply as called photocatalytic material, are finely divided.
  • the photocatalytic material interacts with light whose wavelength is less than the wavelength or the Wavelength range of radiation absorbed and absorbed by the absorption centers Heat is converted. Due to its band gap energy of at least 3 eV the photocatalytic material only interacts with light whose wavelength is less than Is 400 nm.
  • the material that forms the absorption centers interacts accordingly Radiation, the wavelength of which is 400 nm or greater, preferably absorbs light the IR wavelength range.
  • the invention creates a new material that is both photocatalytic also has absorbent properties.
  • One advantage is that the coating of one Carrier material can be simplified because both interactions, namely the Photocatalysis and absorption take place in a single layer and therefore one only the absorption layer used for absorption can be saved.
  • the thickness of the layer is photocatalytically and photothermally changeable Material less critical. While in a multi-layer system, the thickness of the photothermally changeable upper layer can have a great influence on the heating more uniform heating can be achieved within a single layer, if the absorption centers are distributed homogeneously in this layer. Furthermore, the heat-generating absorption centers closer to the imageable or already illustrated Surface, so that sharper temperature gradients in the surface are possible.
  • Particularly sharp temperature gradients can be generated on the surface particularly advantageous for preferred imaging by image-based heating, because the sharpness of the printed image is improved.
  • the printing form according to the invention is in principle, however, also advantageous for an imaging process in which the Imaging by image-wise hydrophilization of the surface and the deletion by full-surface hydrophobization can be brought about.
  • a printing form also according to the invention, has underneath an upper layer, on the other Surface of the printed image is generated, an absorption layer.
  • the Absorption layer becomes correspondingly local by brief, local radiation warmed, i.e. it is warmed up in accordance with the image with locally warm and in contrast to it cold spots.
  • the absorption layer should be even for image-based heating be thin to the heat in the first place normal to the absorption layer to the preferably immediately above top layer with the photocatalytic and deliver thermally changeable material and a heat balance within the Absorption layer in the tangential direction between the locally warm and to prevent cold spots of the absorption layer.
  • the locally generated heat in the absorption layer is via heat conduction from the absorption layer into the Upper layer transferred so that the lipophilic sites on the surface of the upper layer of the printed image.
  • the two layers are thermally conductive with one another over the entire surface connected.
  • the absorption layer preferably borders directly on the top layer.
  • Each of the two layers interacts with radiation from a specific one Wavelength range, the top layer containing radiation that is particularly strong Dimensions is absorbed by the absorption layer, interacts little or not at all, i.e. is transparent to this radiation.
  • the upper layer interacts photocatalytically with light from the UV range while the absorption layer interacts with Radiation from a different wavelength range, preferably from the IR range is let through by the upper layer, is heated.
  • the upper class is through Heat conduction from the absorption layer heated in accordance with the image also correspondingly warms up imagewise and forms the lipophilic surface on its surface due to this heating Image areas.
  • a thermal one Insulation layer is provided between the absorption layer and a printing form carrier to minimize heat loss to the carrier.
  • an absorption layer does not exist, so a thermal insulation layer nevertheless be formed between the top layer and the carrier.
  • a printing form according to the invention by means of the absorption layer is also possible also advantageous for an imaging process in which the imaging by irradiation with UV light and the extinction caused by heating.
  • a diffusion barrier can advantageously be provided between the carrier and the top layer in order to prevent diffusion of atoms of the carrier, in particular of Fe or Al atoms.
  • the diffusion barrier can be formed, for example, by an SiO 2 quartz layer.
  • a layer that acts as a diffusion barrier should be at most 1 ⁇ m thick, such a layer preferably has a uniform thickness of 100 nm or less.
  • a gradual diffusion of, for example, Fe and / or A1 atoms into the top layer could disturb the semiconductor effect used according to the invention, since the electron band structure of the top layer could change adversely during the operation of the printing form due to such diffusion effects.
  • the diffusion barrier can also be designed as a thermal insulation layer.
  • a diffusion barrier can likewise be formed by a layer provided specifically for this purpose, which can in principle be arranged between each of the layers mentioned in a printing form according to the invention.
  • a layer provided specifically as a diffusion barrier is formed between the carrier and the absorption layer if an absorption layer is provided. If a thermal insulation layer is present, the diffusion barrier can be provided between the carrier and the insulation layer or between the insulation layer and the absorption layer which may be present.
  • Such a layer acting as a diffusion barrier can particularly preferably be arranged directly under the top layer. In this case, foreign atoms, which may not only originate from a carrier but also from another functional layer, can be most safely prevented from diffusing into the upper layer.
  • the printing form is erased by irradiating the surface with UV light.
  • Moisture is taken care of. If the activated surface lacks moisture, this leads to a recombination of the electron-hole pairs generated by UV radiation, so that a permanent hydrophilization of the surface is not achieved.
  • the surface preferably becomes water during the extinguishing process supplied that a high humidity is set on the surface.
  • the Increasing the humidity compared to the environment can be caused in particular by Supply of water vapor can be effected or by means of a dampening system Printing machine, which in this case is a device for atomizing water is assigned.
  • the moisture is on and near the surface preferably such that the air adjacent there is saturated with moisture.
  • moisturizing is therefore preferred also a temperature maintenance, i.e. an air conditioning of the printing unit in this way made that a high during the hydrophilization by means of UV radiation Humidity of more than 60%, more preferably of more than 80%, and for that Hydrophobization of the surface set a significantly lower humidity becomes. Furthermore, a significantly lower humidity is also during the Printing process and preferably at all times outside of the hydrophilization adjusted by moisturizing, preferably air conditioning.
  • An encapsulation of the Printing unit simplifies the setting and maintenance of the desired moisture values and preferably also the temperature in the printing unit and in particular at the Printing form.
  • the humidity or the climate can be determined by the arrangement of Humidity sensors and preferably also be monitored by temperature sensors.
  • FIG. 1a shows a surface that is hydrophilic due to irradiation with light from the UV range 130 of a wet offset printing form 31, which is also referred to below as UV-hydrophilic Surface is called.
  • the surface 130 is covered by an upper layer 11 of the printing form 31 formed, which contains a photocatalytically and thermally changeable material or consists entirely of such a material.
  • the excited one that normally exists Condition results for example from the irradiation with natural or artificial Daylight.
  • the layer 11 is irradiated by a light source, the UV light emits at least as part of its spectrum, preferably a daylight source and / or a UV light source 12, the layer 11 is irradiated with high energetic photons 17, so that in the vicinity of the surface 130 of the layer 11 Electrons from the valence band of the photocatalytically and thermally changeable Material into the conduction band. The electrons missing in the valence band leave positive holes h +. Is the electrical potential of the holes h + sufficient high, so can the photocatalytically and thermally changeable material Water molecules 14 react such that a hydroxyl radical ⁇ OH is formed which the atoms or molecules of the photocatalytically and thermally changeable material binds. With increasing number of OH groups bound to the surface 130 the hydrophilic character of surface 130 increases. In particular, water molecules can 14 bind to the OH groups via hydrogen bonds, which in turn bind to the positive holes h + the top layer 11 are bound.
  • FIG. 1b illustrates the wetting of the UV-hydrophilic surface 130 of the layer 11 with a water drop 140.
  • the acute contact angle that the edge of the water drop 140 with the surface 130 is a measure of the hydrophilicity of the surface 130th
  • a preferred photocatalytically and thermally changeable material for the upper layer 11 of the printing form 31 is titanium oxide TiO 2 in the anatase crystal structure.
  • the excitation energy from the valence band to the conduction band is approximately 3.2 eV, which corresponds to a wavelength of 387 nm.
  • the action of ultraviolet light the wavelength of which is not greater than 387 nm, excites valence electrons of the TiO 2 in the conduction band of the semiconductor. This creates a positive hole h + in the valence band.
  • the excited electron is prevented from falling back onto the positive hole h + if a chemical bond of another substance to the activated semiconductor surface takes place beforehand.
  • anatase titanium oxide and certain other semiconductors for example, this is possible if water is present.
  • the hydrophilic state can persist even if UV light no longer acts on the photothermally changeable material.
  • the material which is photocatalytically and thermally changeable in the sense of the invention, should have a valence band energy and a conduction band energy, measured in each case on the two mutually facing edges of the energy bands, which are suitable for the reduction and oxidation of water.
  • the conduction band energy should therefore be at least as negative as the energy required to reduce water (0.0 V in acid solution), and the valence band energy should be at least as positive as the energy required to oxidize water (+1.23 V).
  • the band-gap energy is the energy required to excite electrons from the valence band into the conduction band.
  • the positive holes of the valence band created by the excitation in this case have an advantageously large potential in order to form highly reactive ⁇ OH radicals in connection with water.
  • Particularly preferred materials are the anatase-TiO 2 already mentioned and other materials with a suitable electronic structure in order to bind hydroxyl groups to the material surface by excitation with UV light in the manner described.
  • suitable materials are zinc oxide, ZrO 2 , SrTiO 3 , KTaO 3 or KTa 0.77 Nb 0.23 O 3 , which like TiO 2, the photocatalytically and thermally changeable material, either alone or in a material combination of at least two of the mentioned materials including TiO 2 form.
  • the printing form 31 preferably has at least 40% by weight of the photocatalytically and thermally changeable material in the depth range relevant for the UV-hydrophilic surface, measured on the total weight of the material of the printing form which forms this area. If the photocatalytically and catalytically and thermally changeable material is formed by a combination of materials, a combination of TiO 2 and SiO 2 is a particularly preferred material. SiO 2 can advantageously also form a material in combination with another or more of the materials mentioned which contains photocatalytically and thermally changeable material.
  • hydrophilicity of anatase titanium oxide as an effect of a photocatalytic reaction is known and is used, for example, for self-cleaning surfaces on buildings and anti-fog glass, for example in the automotive sector.
  • titanium oxide layers Another advantageous property of titanium oxide layers is self-cleaning to act because organic particles on the surface decompose photocatalytically over time become. This also applies to the other materials mentioned.
  • the printing form can by natural or artificial daylight can be extinguished.
  • the deletion can be supported by a additional UV source.
  • One for extinguishing alone or in combination with daylight UV lamps used should have a spectrum with a sufficient amount of UV light with a wavelength of 387 nm and smaller.
  • the peak is preferably of the emitted spectrum at a wavelength of 387 nm, corresponding to a band gap energy of 3.2 eV, or a shorter wavelength. It's the spectral one Distribution of the radiation preferably predominantly below 387 nm.
  • a UV laser or UV laser system can be used as the UV lamp.
  • Focusing optics for the laser or lasers are preferably dispensed with.
  • the UV-hydrophilic surface is localized by irradiation with (IR) infrared laser light made color friendly.
  • the printing form is not significantly heated overall. It remains at the temperature normally prevailing in a printing press Range from 10 ° C to 40 ° C.
  • FIG. 1c illustrates the removal of the hydrophilicity of the UV-hydrophilic surface 130. This is done by locally heating the top layer 11 according to the image.
  • the exposure or imaging is carried out by irradiation with laser light 18.
  • the wavelength of the laser light 18 can be in the visible range up to the near infrared (NIR), ie between approximately 400 and 3000 nm.
  • Laser light from the range from 700 nm to 3000 nm and particularly preferably from the range from 800 nm to 1100 nm is preferably used for imaging. Due to the local action of the laser light 18, a lipophilic surface area 131 corresponding to the laser spot on the surface is generated on the surface 130.
  • NIR near infrared
  • Figure 1d illustrates the wetting of layer 11 by water in the non-irradiated Surface area 130 and the irradiated surface area 131.
  • the irradiated and thereby heated material in the surface area 131 is water wetting low.
  • the contact angle formed in the surface area 131 between the surface area 131 and the water drop 141 is large, and the layer 11 is lipophilic in this surface area 131.
  • UV light from the Environment for a new stimulation of the photocatalytically and thermally changeable Material it is sufficient that the printing form is in the shade. This is in Usually given after installing the printing form in a printing press.
  • FIGS. 2a to 2d show advantageous exemplary embodiments for a layered structure Printing form 31, which is preferably designed as a printing plate and on a Printing form cylinder can be clamped or is already clamped.
  • the printing form 31 of FIG. 2a has a two-layer structure with a carrier layer 21 and a single top layer 24, applied directly to the carrier layer 21, on the other free surface the print image is generated or in the case of an illustrated printing form 31 already exists.
  • Layer 24 contains a photocatalytic and thermal changeable material 24a in a sufficiently large proportion to a pixel-wise fine To enable imaging. The case is to be included that the layer 24 exclusively from a photo-catalytically and thermally changeable material 24a consists.
  • the carrier layer 21 is made of one flexible steel plate or aluminum plate formed and subsequently simply as Carrier designated.
  • the upper layer 24 is a dispersion from the photocatalytic in the exemplary embodiment and thermally changeable material 24a and absorbent particles contained in the material 24a are dispersed in a fine, uniform distribution.
  • the absorption particles are nanoparticles of a semiconductor material that emit radiation from the IR wavelength range absorbed, converted into heat and transferred to the surrounding, outputs photocatalytically and thermally changeable material 24a.
  • the absorption particles form the absorption centers 24b for the radiation used for heating. It can also particles of several semiconductor materials that form absorption centers 24b.
  • a printing form carrier has a high mechanical strength should, in order to enable permanent installation within the printing press such a carrier consist of steel or aluminum, for example.
  • a carrier to decrease the imaging effect of the top layer locally increase heat generated.
  • an insulation layer can be provided, which conducts heat to the carrier reduced.
  • the material of the insulation layer should naturally have a low thermal conductivity exhibit.
  • FIG. 2b shows an embodiment in which an absorption layer is initially on the carrier 21 23 and the top layer 24 are applied thereon.
  • This three-layer structure is locally imaged by the radiation during the imaging in the absorption layer 23 Generates heat.
  • the heat generated in the absorption layer 23 is transferred via the Contact surface in the upper layer 24, which is the photocatalytic and thermal changeable material 24a contains, transferred and reaches the surface of the top layer 24.
  • the heat transfer to the atoms or Molecules on the surface to which the OH groups are attached split of these bonds, causing recombinations and a decrease in hydrophilicity comes.
  • a layer thickness of the absorption layer 23 of 1 ⁇ m to 5 ⁇ m is advantageous.
  • the upper layer 24 has a special absorption layer 23 uniform thickness from preferably 0.05 ⁇ m to 5 ⁇ m, particularly preferably from 0.05 ⁇ m to 2 ⁇ m. Without an absorption layer, such as in the first In the exemplary embodiment, the top layer 24 advantageously has a layer thickness of 1 ⁇ m to 30 ⁇ m, particularly advantageously between 1 ⁇ m to 10 ⁇ m.
  • Figure 2c shows a third preferred embodiment.
  • a thermally insulating intermediate layer 22 on which immediately the upper layer 24 with the photocatalytically and thermally active material 24a is arranged.
  • the thickness of the intermediate layer 22 is preferably between 1 ⁇ m and 30 ⁇ m.
  • absorption centers 24b evenly distributed.
  • the upper layer 24 has preferably a thickness of 1 ⁇ m to 30 ⁇ m, particularly preferably a thickness of 1 ⁇ m up to 10 ⁇ m.
  • Figure 2d shows a fourth embodiment.
  • a thermally insulating intermediate layer 22 the thickness of which is preferably above the substrate 21 is between 1 ⁇ m and 30 ⁇ m.
  • an absorption layer 23 is provided, the layer thickness of which is preferably between 1 ⁇ m and is 5 ⁇ m.
  • An upper layer 24 is arranged on the absorption layer 23 the photocatalytically and thermally changeable material 24a contains or exclusively consists of such material and preferably has a thickness of 0.05 ⁇ m to 5 ⁇ m, particularly preferably from 0.05 ⁇ m to 2 ⁇ m.
  • top layers 24 of the exemplary embodiments in FIGS. 2b and 2d can likewise have dispersed absorption centers, although because of the absorption layer 23 also on the installation of absorption centers in which the photocatalytic and thermal changeable material can be dispensed with. In the embodiment of Figure 2d nevertheless a top layer 24 with dispersed absorption centers 24b is formed.
  • top layer and one or more additional layers or Layers are, for example, the sol-gel process and the CVD process (Chemical Vapor deposition).
  • the layer or layers can or can be immediate applied on top of each other, i.e. without mediating layers such as Adhesive layers.
  • FIG. 3 shows a printing unit with a printing form cylinder 32, an associated one Blanket cylinder 38 and an impression cylinder 39, which with the blanket cylinder 38 forms a printing nip for a web 37 to be printed.
  • On the printing form cylinder 32 two pressure plates 31 are attached in a known manner.
  • an imaging device are arranged in the printing press 33, two quenching devices 34, inking rollers 35 and a dampening roller 36.
  • a dampening solution film is applied in a known manner via the dampening application roller 36, preferably a film of water, to which printing formes 31 are brought up.
  • the paint application rollers 35 becomes imagewise color during printing in a manner also known transferred to the printing forms 31, which of the printing forms 31 initially to the blanket cylinder 38 and is transmitted from this to the web 37.
  • the Impression cylinder 39 can itself be a blanket cylinder of another printing unit for double-sided printing, a steel cylinder for only one printing point or one Steel cylinder of a satellite printing unit, for example a 9 or 10 cylinder printing unit his.
  • the imaging device 33 is the surface of the printing form 31 to be imaged directly facing and arranged parallel to the axis of rotation of the printing form cylinder 32.
  • the imaging unit 33 has a plurality of along the axis of rotation of the Printing form cylinder 32 lasers arranged side by side. The laser spots of this Lasers are focused on the surface of the printing form 31.
  • the lasers of the Imaging device 33 are preferably side by side to one or more arranged laser arrays summarized. An imaging device in preferred Embodiments are described in DE 199 11 907 A1, which is used as an example is taken.
  • the two extinguishing devices 34 each have at least one daylight emitter and / or at least one UV lamp.
  • the extinguishers 34 are over the scope of the Printing form cylinder 32 spaced from each other parallel to the axis of rotation of the Printing form cylinder 32 arranged. Basically, a single would Erasing devices 34 are sufficient to close the imaged surfaces of the printing formes 31 delete by using the photothermally modifiable surface Material in relation to the respective print image in the normal hydrophilic state whole-area irradiation with light from the UV range is set back.
  • the erasure devices 34 are switched off during the imaging.
  • the extinguishers 34 turned on.
  • the surfaces of the printing formes 31 is wetted with water in order to previously lipophilic surface areas permanently bound by OH groups to make hydrophilic.
  • the dampening unit of the printing unit or a Steam generator can be used.
  • the printing unit, the printing form cylinder 32 and the Blanket cylinder 38 includes, encapsulated and conditioned to the environment within the encapsulation 40 the humidity and also the temperature of the particular one To be able to optimally adapt the operating state. So within the encapsulation 40 a uniformly high humidity of at least 60% during the extinguishing process prevail, preferably at least 80%, while for imaging and ongoing Pressure production the humidity should be significantly lower. Preferably encloses the Encapsulation 40 as in the embodiment also the impression cylinder 39. If that Printing unit includes other cylinders, are preferably also to the printing unit belonging further cylinder enclosed by the encapsulation 40.
  • the encapsulation 40 preferably each of the two against each other Blanket cylinders and their associated printing form cylinders. It can Encapsulations 40 in the case of printing units formed in this way also for the conventional H or N bridges, i.e. for four blanket cylinders and their plate cylinders, be formed. For satellite printing units with nine or ten cylinder units these units are preferably each of its own encapsulation 40 enclosed.
  • the a predetermined humidity for adjusting and attitude F to and a predetermined temperature T set air conditioner used comprises on the encapsulation 40 and the means for the supply of water, in the embodiment, the dampener roller 36, a humidity and temperature controller 43 and at least one within the Encapsulation 40 arranged moisture sensor 41 and at least one temperature sensor 42 arranged inside the encapsulation 40.
  • the sensors 41 and 42 record the air humidity and the temperature within the encapsulation 40 and give both the air humidity and the temperature depending on the control variable F ist and T ist the controller 43.
  • the controller 43 forms the difference between the recorded values of humidity and temperature and the predetermined values to the respective difference F-F and T to T and forms in dependence on the humidity difference and the temperature difference, the humidity control variable F and the temperature control variable T for the devices acting within the encapsulation 40 for the supply of water and the influencing of the temperature.
  • Imaging and deletion in the printing press is preferred, especially imaging and deletion on the printing form cylinder on which the printing form is also in the Print production is attached or integrated on the cylinder. Basically you can however, the imaging and erasure are also carried out outside the printing press become. Also performing one of the operations in the press and performing the other of the operations outside the press is not intended to be excluded become.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Materials For Photolithography (AREA)
  • Printing Methods (AREA)
  • Catalysts (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP02405245A 2001-03-29 2002-03-27 Plaque d'impression offset comprenant un matériau photo-thermo convertible, procédé et dispositif pour créer et/ou effacer l'image de la plaque d'impression offset Expired - Lifetime EP1245385B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10115435A DE10115435B8 (de) 2001-03-29 2001-03-29 Verfahren zur Erzeugung eines Druckbilds und/oder zur Löschung eines Druckbilds einer Nassoffset-Druckform mit fotothermisch veränderbarem Material
DE10115435 2001-03-29

Publications (3)

Publication Number Publication Date
EP1245385A2 true EP1245385A2 (fr) 2002-10-02
EP1245385A3 EP1245385A3 (fr) 2002-11-20
EP1245385B1 EP1245385B1 (fr) 2006-03-29

Family

ID=7679484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02405245A Expired - Lifetime EP1245385B1 (fr) 2001-03-29 2002-03-27 Plaque d'impression offset comprenant un matériau photo-thermo convertible, procédé et dispositif pour créer et/ou effacer l'image de la plaque d'impression offset

Country Status (7)

Country Link
US (2) US7051652B2 (fr)
EP (1) EP1245385B1 (fr)
JP (3) JP3874692B2 (fr)
AT (1) ATE321661T1 (fr)
DE (2) DE10115435B8 (fr)
DK (1) DK1245385T3 (fr)
ES (1) ES2261623T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004007600A1 (de) * 2004-02-17 2005-09-01 Heidelberger Druckmaschinen Ag Druckform mit mehreren flächigen Funktionszonen
EP1834769A2 (fr) * 2006-03-18 2007-09-19 MAN Roland Druckmaschinen AG Machine d'impression de feuilles
US7735421B2 (en) 2004-08-25 2010-06-15 Heidelberger Druckmaschinen Ag Method for manufacturing a printing form and printing form with thermally insulating layer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10213802B4 (de) 2002-03-27 2010-02-18 Wifag Maschinenfabrik Ag Verfahren zur Erhaltung von Bildinformation einer bebilderten Druckform
FI116389B (fi) * 2002-07-16 2005-11-15 Millidyne Oy Menetelmä pinnan ominaisuuksien säätämiseksi
US20090130451A1 (en) * 2007-11-19 2009-05-21 Tony Farrell Laser-weldable thermoplastics, methods of manufacture, and articles thereof
US8246754B2 (en) * 2009-09-25 2012-08-21 Hewlett-Packard Development Company, L.P. Process for removing ink from printed substrate
CN102248688A (zh) * 2011-03-14 2011-11-23 北京工业大学 水膜快速擦写导电聚偏乙烯导电层的方法
DE102013114706B4 (de) * 2013-12-20 2017-02-16 Sandvik Surface Solutions Division Of Sandvik Materials Technology Deutschland Gmbh Reinigung von Pressblechen oder umlaufenden Pressbändern
CN114911141B (zh) * 2022-07-11 2022-09-23 上海传芯半导体有限公司 Euv光刻方法及euv光刻设备

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EP0911154A1 (fr) 1997-10-24 1999-04-28 Fuji Photo Film Co., Ltd. Appareil pour la fabrication d'une plaque d'impression et imprimante et système d'impression utilisant cet appareil
EP0911155A1 (fr) 1997-10-24 1999-04-28 Fuji Photo Film Co., Ltd. Appareil pour la fabrication d'une plaque d'impression et imprimante et système d'impression utilisant cet appareil
EP1020304A2 (fr) 1999-01-18 2000-07-19 Fuji Photo Film Co., Ltd. Procédé d'impression lithographique et imprimante l'utilisant
DE19911907A1 (de) 1999-03-17 2000-10-19 Wifag Maschf Belichtungsverfahren und Belichtungsvorrichtung zur Bebilderung einer Druckform für einen Nassoffsetdruck

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DE19612927B4 (de) * 1995-05-11 2009-12-10 Kodak Graphic Communications Canada Company, Burnaby Druckmaschine und Bilderzeugungsverfahren für eine Druckmaschine
US5743188A (en) * 1995-10-20 1998-04-28 Eastman Kodak Company Method of imaging a zirconia ceramic surface to produce a lithographic printing plate
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US5836248A (en) * 1997-05-01 1998-11-17 Eastman Kodak Company Zirconia-alumina composite ceramic lithographic printing member
DE69805723T2 (de) * 1997-09-12 2003-01-02 Fuji Photo Film Co Ltd Flachdruckverfahren und Druckplatte-Vorstufe für den Flachdruck
US6096471A (en) * 1998-05-25 2000-08-01 Agfa-Gevaert, N.V. Heat sensitive imaging element for providing a lithographic printing plate
DE19826377A1 (de) * 1998-06-12 1999-12-16 Heidelberger Druckmasch Ag Druckmaschine und Druckverfahren
US6391522B1 (en) * 1998-10-23 2002-05-21 Fuji Photo Film Co., Ltd. Offset printing plate precursor and method for offset printing using the same
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JP2000272265A (ja) * 1999-03-29 2000-10-03 Kodak Polychrome Graphics Japan Ltd 直描型平版印刷版原版およびそれを用いた印刷刷版作製方法
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EP0911154A1 (fr) 1997-10-24 1999-04-28 Fuji Photo Film Co., Ltd. Appareil pour la fabrication d'une plaque d'impression et imprimante et système d'impression utilisant cet appareil
EP0911155A1 (fr) 1997-10-24 1999-04-28 Fuji Photo Film Co., Ltd. Appareil pour la fabrication d'une plaque d'impression et imprimante et système d'impression utilisant cet appareil
EP1020304A2 (fr) 1999-01-18 2000-07-19 Fuji Photo Film Co., Ltd. Procédé d'impression lithographique et imprimante l'utilisant
DE19911907A1 (de) 1999-03-17 2000-10-19 Wifag Maschf Belichtungsverfahren und Belichtungsvorrichtung zur Bebilderung einer Druckform für einen Nassoffsetdruck

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004007600A1 (de) * 2004-02-17 2005-09-01 Heidelberger Druckmaschinen Ag Druckform mit mehreren flächigen Funktionszonen
US7704590B2 (en) 2004-02-17 2010-04-27 Heidelberger Druckmaschinen Ag Printing form having a plurality of planar functional zones
US7735421B2 (en) 2004-08-25 2010-06-15 Heidelberger Druckmaschinen Ag Method for manufacturing a printing form and printing form with thermally insulating layer
EP1834769A2 (fr) * 2006-03-18 2007-09-19 MAN Roland Druckmaschinen AG Machine d'impression de feuilles
EP1834769A3 (fr) * 2006-03-18 2010-10-20 manroland AG Machine d'impression de feuilles

Also Published As

Publication number Publication date
US7051652B2 (en) 2006-05-30
DK1245385T3 (da) 2006-07-24
DE50206222D1 (de) 2006-05-18
DE10115435B4 (de) 2006-11-02
EP1245385B1 (fr) 2006-03-29
JP2006137197A (ja) 2006-06-01
ES2261623T3 (es) 2006-11-16
JP2004306613A (ja) 2004-11-04
JP3874692B2 (ja) 2007-01-31
DE10115435B8 (de) 2007-02-08
US6976428B2 (en) 2005-12-20
EP1245385A3 (fr) 2002-11-20
US20020139269A1 (en) 2002-10-03
US20040168599A1 (en) 2004-09-02
ATE321661T1 (de) 2006-04-15
JP2003011536A (ja) 2003-01-15
DE10115435A1 (de) 2002-10-24

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