EP1348547B1 - Procédé pour maintenir l'mage sur une plaque d'impression imagée - Google Patents

Procédé pour maintenir l'mage sur une plaque d'impression imagée Download PDF

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Publication number
EP1348547B1
EP1348547B1 EP03405111A EP03405111A EP1348547B1 EP 1348547 B1 EP1348547 B1 EP 1348547B1 EP 03405111 A EP03405111 A EP 03405111A EP 03405111 A EP03405111 A EP 03405111A EP 1348547 B1 EP1348547 B1 EP 1348547B1
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EP
European Patent Office
Prior art keywords
printing
action
printing block
image
printing form
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
Application number
EP03405111A
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German (de)
English (en)
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EP1348547A2 (fr
EP1348547A3 (fr
Inventor
Matthias Riepenhoff
Reinhold Güth
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 date
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Publication of EP1348547A2 publication Critical patent/EP1348547A2/fr
Publication of EP1348547A3 publication Critical patent/EP1348547A3/fr
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Publication of EP1348547B1 publication Critical patent/EP1348547B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/06—Lithographic printing
    • 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
    • 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 for obtaining image information of an imaged printing form.
  • Newspapers are mainly produced in wet offset.
  • Printing machines as it relates to the present invention preferably, typically contain printing units with blanket cylinders, plate cylinders, inking units and dampening units.
  • a printing form stretched onto a printing form cylinder usually has a surface in the form of a top layer, which has hydrophilic (water-friendly) and hydrophobic (water-repellent) or lipophilic regions in the imaged state.
  • the printing form is formed by a printing plate, which is mounted on a plate cylinder designed as a plate cylinder.
  • the printing form has imagewise applied lipophilic areas.
  • the non-image sites are hydrophilic and bind water more than the color used for printing.
  • the lipophilic areas repel water and therefore have a color-friendly effect.
  • any surface can be used for the offset process, which can be divided into hydrophilic and hydrophobic or lipophilic areas.
  • an imaging is understood to mean a process in which the printing form is acted on at the points which form the pixels, so that a template corresponding to the printed image is produced on the printing form by forming hydrophilic and lipophilic regions.
  • a deletion is understood to mean a process in which the printing form is preferably treated, not as a function of the image, but over the entire surface in such a way that the image information applied in the imaging, that is to say the printed image, is removed again.
  • printing plates or printing plates exist a variety of materials and methods.
  • imagewise irradiate a printing plate with a laser and then develop it chemically.
  • printing forms can be produced by laser ablation. In this case, either lipophilic areas under a hydrophilic layer or hydrophilic areas under a lipophilic layer are exposed.
  • ink-jet process or by thermal diffusion imagewise applied material to a surface, thereby creating an offset printing form.
  • the decisive for the imaging of the printing forme process can either be done in a separate system or within the printing press.
  • the object of the present invention is to provide a method to enable the preservation of image information of a printing plate in a simple manner and thus to enable the printing of long runs.
  • a preferred application relates to the preservation of image information of erasable printing forms, preferably in offset printing, more preferably in wet offset printing.
  • the image information of an imaged printing form is maintained by acting on the imaged printing form with the color transferred to it in such a way that surface properties of the printing form corresponding to the imaging are obtained or refreshed. It is advantageous that the rewritable printing form for maintaining a sufficient print quality is not first deleted and then reimaged with fresh image information, but the surface properties that are responsible for color transfer, print quality, etc., are maintained during production or refreshed again , The inventive method thus enables high print runs while maintaining print quality. Since the printing form used must not be erased and rewritten or replaced by another printing form, production can preferably be made without interruption while maintaining print quality.
  • the differently hydrophobic and hydrophilic areas of the printing plate responsible for the image formation are influenced so that the hydrophobic and hydrophilic properties of imagewise areas of the imaged printing plate with the ink transferred thereto are modified according to the strength of the action on the printing plate, so that overall the imaging on the printing form is maintained.
  • Very particular preference is given to influencing the surface properties of the same by the action on the imaged printing form, which in turn may have an influence on image transfer properties and / or ink adhesion properties of the imaged printing form, the effect being such that the achievable print quality remains substantially constant.
  • the action on the imaged printing plate takes place during production at a plate cylinder rotating essentially at normal printing speed, so that no slowing down of the current production occurs.
  • the impact can also during a comparatively short stoppage of production, without the image being deleted and the printing form being reprinted. Rather, the printing form cylinder is rotated comparatively slowly, while the action on the printing form to maintain the responsible for the print quality surface properties of the printing form.
  • the action on the printing form during production is possible, for example, when the image data forming the printed image is transmitted to actuators or process means which, in correspondence with the transmitted image data, are directed specifically to the image sites or to the non-image sites of the printing form or printing process
  • the hydrophobic or hydrophilic areas act. Examples of such action mechanisms are described in the Handbuch der Printmedien by H. Kipphan, supra, so that details may be omitted for reasons of clarity.
  • the image-wise action is particularly preferably carried out during production with essentially stationary or only slowly rotating printing form cylinder, since the currently known actuators can act only comparatively slowly on the printing plate.
  • the action during production takes place essentially over the entire area of the printing form.
  • This is described by way of example with reference to a wet offset printing process in which, as is known, the image areas or hydrophobic sections of the printing form are affixed with a color layer during the printing process, whereas the non-image areas are not covered with printing ink.
  • the action mechanism can be chosen such that the hydrophobic and hydrophilic sections of the printing form are influenced differently due to the applied ink layer, wherein the applied ink layer is utilized for the required differentiation of the action mechanism.
  • an optical radiation acts on a printing form that responds to optical radiation during printing
  • the influence of the optical radiation on the non-image areas differs from that of the image locations because the radiation is imagewise filtered because of the color layer applied to the printing form.
  • the whole area Irradiation of the printing form is thus due to the overlying color layer automatically an imagewise different influence on the image locations and non-image areas of the printing form.
  • This effect is enhanced when optical radiation is applied to the printing form whose frequency is in an absorption band of the color used for printing.
  • the maximum of the absorption band, the spectral width of the absorption band and the frequency of the optical radiation used the visual preservation of the interface properties of the printing form can be optimally adapted to the operating conditions.
  • the aforesaid radiation absorption can also be used to suppress the hydrophilization of these areas due to local heating due to absorption in the color areas above the image areas.
  • optical radiation having other wavelengths for example wavelengths in the visible wavelength range or in the infrared wavelength range, can also be used for such locally different heating, as long as the optical radiation of pigments or other constituents of the printing ink used, for example additives, is sufficiently absorbed.
  • additives can z. B. absorb only in the UV range and thus have no effect on the print quality.
  • a printing plate is used in which a permanent hydrophilization can be achieved on the surface, for example by photocatalysis.
  • a printing forme is known, which can be rendered hydrophilic by UV radiation. This leads to an excitation of the atoms in a higher energetic state, which allows an interaction with water molecules of the environment. In the presence of water in the environment, such as fountain solution, it will bind the water to the surface of the printing plate, thereby retaining the hydrophilicity even after the irradiation is stopped. However, if there is no water in the environment, they return to their original energetic state and do not remain permanently hydrophilic.
  • the non-image areas are covered with a water film, whereas the image areas are covered with an oily color layer which contains only relatively little water.
  • the UV radiation reaches not only the color-free non-image areas, but also passes through the ink layer through to the image locations (apart from absorption - and scattering effects) and can in principle stimulate the surface of the printing plate.
  • the wavelength of the optical radiation, the absorption wavelength of the printing ink and the width of the absorption of the color are available as parameters. These parameters can be changed by changing the wavelength of the light or using Adjustments to the color to be adjusted in order to allow an optimal image refreshing of the imaging with full-area irradiation of the printing plate.
  • an electric field or an electrostatic potential may be applied to the surface of the printing form, for example by means of a high-voltage electrode which is arranged at a uniform, small distance from the surface of the printing form.
  • the effect of an electric field or electrostatic potential is different on image sites and non-image sites and can be exploited according to the invention.
  • Additives can render the dampening solution used in the wet offset printing process conductive, so that charges which form on sections of the printing form surface which are not covered with ink can be diverted, while the insulating, oily printing ink without such an additive prevents discharges of charges.
  • the insulating, oily ink remains electrostatically charged.
  • imagewise action can be achieved, so that, for example, the ink adhesion properties and / or the image transfer properties of the printing plate to a downstream roller, such as blanket cylinder, are imagewise modifiable.
  • the surface of the printing form can contain ferroelectric materials, for example ceramics, multilayer ceramic systems or also polymers, as are known for direct imaging systems of the prior art.
  • ferroelectric materials for example ceramics, multilayer ceramic systems or also polymers, as are known for direct imaging systems of the prior art.
  • the orientation of the ferroelectric materials can be changed pixel by pixel. Due to the known hysteresis curve, which describes the dependence of the polarization on the electric field strength, the ferroelectric material can usually be in three excellent states, which are referred to as electrically positive, electrically negative and neutral, and between which the material can be switched back and forth , where the states are each stable.
  • the ink layer adhering to the printing form may be in the form of a dielectric Be treated layer. The dielectric constant of the ink layer can be further enhanced by dielectric additives.
  • the acting dielectric displacement D is different at image sites and non-image sites, so that despite full-surface application of an electrostatic potential or electric field imagewise influencing the surface properties of the printing plate can be effected to imagewise modifying Farbhaftigenschaften and / or image transfer properties.
  • the chemical substance in the form of a liquid or as an additive to a liquid sprayed over the entire surface or applied over the entire surface by means of a dampening unit Due to the imagewise applied ink layer, the liquid comes into contact only at the non-image areas with the surface of the printing plate. If the printing form is chosen so that hydrophilization of the surface can be effected by photocatalysis or other optical effects, then the liquid required for the hydrophilization is automatically available at the non-image sites. By appropriate irradiation, thus, the hydrophilization at the non-image sites can be suitably obtained.
  • Another example is the supply of airflow to the surface of the printing plate.
  • wet offset can be promoted by means of an air flow, the evaporation of fountain solution, which rests on the non-image areas.
  • the printing form is thus removed from the heat of evaporation and cooled the printing form surface locally.
  • the cooling effect is less at the image points if the ink evaporates less strongly, and stronger if the ink contains volatile substances.
  • full-surface exposure of the printing plate surface with the air flow thus imagewise influencing the relevant parameters for the print quality can be achieved, for example, the ink adhesion properties and / or ink transfer properties of the printing plate.
  • the air flow may be mixed with a chemical substance which enhances or alleviates the aforementioned effects.
  • Fig. 1 shows schematically a method according to the present invention.
  • the printing form 1 On a support of the printing form 1 are imagewise applied hydrophilic region 20 and hydrophobic regions 30, which are formed by known methods on the printing plate.
  • the printing form 1 can have a photocatalytically and / or thermally changeable material, as disclosed, for example, in DE 101 15 435.
  • the hydrophilic and hydrophobic regions can also be produced, for example, by laser ablation, ink-jet processes, toner application, polarization of ferroelectric materials of the printing form or by locally different image-wise heat input.
  • a wet offset printing process as exemplified by FIG.
  • a water layer 21 is located on the hydrophilic areas, while a color layer 31 rests on the hydrophobic areas 30.
  • On the surface of the printing plate 1 is in shape the differently hydrophilic and hydrophobic regions 20, 30 applied an imaging corresponding to the current print production, in particular in the form of areas of different surface properties.
  • a process means 40 which acts on the surface of the printing form 1 to obtain or refresh the image information of the imaging of the printing form 1.
  • the process means 40 comprises a number of processing means 41, which are preferably arranged in the axial direction of the printing form 1 at a substantially constant distance therefrom in order to ensure uniform action on the printing form 1.
  • the processing means 40 can act imagewise on the printing form 1.
  • the hydrophilic properties of the hydrophilic region 20 can be refreshed or obtained and / or the hydrophobic properties of the hydrophobic regions 30 can be maintained or refreshed again.
  • the image information required for this purpose is applied to the process means 40 in a known manner, for example as a bitmap file, and serves for imagewise control of the process means 41 serving as actuators, which act locally on the printing form surface in accordance with the image information of the imaging.
  • the process means 40 acts on the surface of the printing form 1 over the whole area. Since the surface of the printing form 1 includes both areas covered with a coloring layer 31 and areas not covered with a coloring layer, for example, portions covered with the fountain solution film 21, the action on the surface of the printing form 1 locally becomes different be. Thus, in spite of full-surface impact automatically imagewise acted on the surface.
  • the physical and / or chemical effect underlying the action only has to be chosen such that the action is attenuated or intensified by the ink layer 31 adhering to the surface of the printing form 1. Suitable physical and / or chemical effects will become apparent to those skilled in the art upon studying this application.
  • the process means 40 is a light source with a number of individual light sources 41 (for example LEDs or laser diodes with associated imaging optics) which irradiate the surface of the printing form 1 uniformly and over the entire surface.
  • the light source 40 is aligned in a strip parallel to the printing form 1 and illuminates a strip-shaped portion of the printing form 1.
  • the irradiation causes a locally different modification of print quality relevant parameters, such as the ink adhesion properties and / or ink transfer properties of the printing form 1. This is required in that interfacial properties of the printing form 1 are suitably modified by the interaction of the printing form surface with the optical radiation 42.
  • the printing forme 1 preferably comprises a material which, by irradiation with light, is photocatalytically displaceable into a hydrophilic state and thermally, namely by heating, into a lipophilic state.
  • the optical radiation 42 passes substantially unhindered onto the surface of the printing form 1.
  • atoms are locally excited to higher energetic states. This results in an interaction with the environment, namely in the water film 21, existing water molecules.
  • the hydrophilic properties of the sections 20 are refreshed and maintained.
  • the ink layer 31, which contains relatively few water molecules prevents sufficient water molecules from being available at the regions 30 in order to be able to effect hydrophilization of the surface sections 30 by means of the photocatalytic effect.
  • the hydrophobic regions 30 remain hydrophobic.
  • a possible hydrophilization of the regions 30, for example due to residual moisture in the printing ink, can be even more inhibited if the wavelength of the optical radiation 42 is chosen so that it is in an absorption band of the dye contained in the ink layer 31 and / or a therein Addition lies.
  • the optical radiation 42 is UV light and is said absorption band in the ultraviolet spectral range.
  • the imaging can thus be obtained or refreshed again. In the enlarged partial section according to FIG. 2, this effect is more clearly recognizable.
  • the action on the printing form 1 with the aid of the process means 40 can be continuous or discontinuous.
  • a fixed program may specify that the action be turned on at constant time intervals or after printing a predetermined number of copies or a predetermined length of substrate for a given time interval.
  • the time interval can be varied depending on characteristics of the current print production.
  • the strength and / or duration of the action can be adjusted by means of an automatic control or regulation.
  • an operator can determine the conditions of the action, in particular strength and / or duration; initially set manually, in accordance with the expected or achievable production conditions. Then the further setting of the relevant parameters of the automatic control or regulation can be transferred. This automatically makes an adjustment of the strength and / or duration of the action based on measurements.
  • the parameters to be set depend on the action mechanism underlying the action. If the action takes place, for example, with the aid of optical radiation, then the wavelength and / or intensity and / or focusing and / or polarization and / or duration and / or modulation of the optical radiation can be varied.
  • printed copies or the printed web can be measured using optical sensors to assess the print quality; For this purpose, with the knowledge of the printed image information, it is possible to measure selected sections by means of which the print quality can be suitably assessed. Examples are little or no sections to be printed, which give information about the so-called toning of the printing plate or the blanket cylinder. Another example is transition areas between low-printed areas and heavily printed areas, from which contrast information can be derived. Another example is test patterns that are printed, for example, at the edge of the current print production. Measurements can also be taken directly from the printing form are derived and later removed, for example, can be separated. For example, the electrostatic charge of the printing form can be measured or the light scattering or the degree of coverage of the printing plate surface with color can be measured by reflection measurement in order to obtain information about the surface properties of the surface of this printing plate.
  • the action may also be based on a different physical and / or chemical effect. Suitable mechanisms of action will become apparent to those skilled in the art upon study of this application.
  • an electric field or electrostatic potential and / or a magnetic field to the printing plate 1 and / or by the action of heat and / or a gas and / or blown air and / or a liquid and / or a vapor on the printing form. 1 the image obtained in the aforementioned manner or be refreshed.
  • Fig. 3 shows schematically a printing unit for the inventive method.
  • This comprises a printing form cylinder 52, an associated blanket cylinder 58 and an impression cylinder 59, which forms a printing gap for a web 57 to be printed with the blanket cylinder 58.
  • two pressure plates 51 are fixed in a known manner.
  • each of the two printing plates 51 is formed by a printing plate according to the invention, as shown for example in FIGS. 1 and 2.
  • an imaging device 53 for imaging, inking rollers 55 and a dampening roller 56 are arranged over the circumference around the printing form cylinder 52.
  • an imaging device 53 for imaging, inking rollers 55 and a dampening roller 56.
  • a dampening solution film preferably a water film
  • the counter-pressure cylinder 59 may itself be a blanket cylinder of another printing unit for double-sided printing, a steel cylinder for only a single pressure point or a steel cylinder of a satellite printing unit, for example a 9 or 10 cylinder printing unit.
  • a process means 54 which acts on the printing form cylinder 52 in the aforementioned field.
  • erasing means (not shown) may be provided in known manner to erase the artwork on the printing plates.
  • the process means 54 is directly facing the surface of the printing forme 51 to be imaged and arranged parallel to the axis of rotation of the printing forme cylinder 52. Thus, a full-surface impact on the surface of the plate cylinder 52 can be achieved.
  • the quenchers not shown, are turned off.
  • the process agent 54 continuously or discontinuously acts on the surface of the plate cylinder 52 in the manner described above to refresh the image provided on the printing plates 51.
  • the refreshing or preservation of the imaging is preferably carried out at substantially with the normal printing speed rotating printing plate cylinder 52.
  • the print production can also be interrupted for a short time and the rotational speed of the plate cylinder 52 significantly lowered or brought to a standstill with the aid of the processing means 54, the imaging to refresh or receive again.
  • This procedure is particularly suitable for a pictorial refreshing or preservation of the imaging, so that the duration of the action can be sufficiently selected.
  • the erasers not shown, preferably remain switched off and an ink layer is applied to the image areas, which allows the image conservation or refreshment of the invention despite full-surface exposure to the plate cylinder 52 and the printing plates 1.

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  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Claims (13)

  1. Procédé pour maintenir des informations image d'une plaque d'impression (1) imagée qui comprend des zones (29, 30) ayant des caractéristiques de surface différentes, procédé dans lequel
    a) l'encre (31) est transférée sur la plaque d'impression (1) imagée conformément à une production d'une image, et
    b) une action est exercée sur toute la surface de la plaque d'impression (1) imagée sur laquelle l'encre (31) a été transférée afin de maintenir les caractéristiques de surface de la plaque d'impression conformément à production d'une image, dans lequel
    c) une couche d'encre appliquée au moyen de l'encre (31) sur la plaque d'impression (1) est utilisée pour une différenciation par zone du mécanisme d'action.
  2. Procédé selon la revendication 1, dans lequel, sous l'effet de l'action, des caractéristiques hydrophobes et hydrophiles de zones de type image de la plaque d'impression imagée sont modifiées en fonction de l'intensité de l'action.
  3. Procédé selon l'une des revendications précédentes, dans lequel, sous l'effet de l'action, des caractéristiques de surfaces limites de la plaque d'impression (1) sont influencées pour modifier les caractéristiques de transfert d'image et/ou les caractéristiques d'adhérence de l'encre de la plaque d'impression (1) imagée.
  4. Procédé selon l'une des revendications précédentes, dans lequel l'action intervient pendant une production avec un cylindre de plaque d'impression (52), tournant essentiellement à la vitesse d'impression, qui porte la plaque d'impression (1) imagée.
  5. Procédé selon l'une des revendications 1 à 3, dans lequel l'action intervient pendant une production avec un cylindre de plaque d'impression (52), essentiellement immobile ou ne tournant que lentement, qui porte la plaque d'impression (1) imagée.
  6. Procédé selon l'une des revendications précédentes, dans lequel l'action s'effectue de façon continue ou discontinue.
  7. Procédé selon l'une des revendications précédentes, dans lequel l'intensité et/ou la durée de l'action dans le temps est réglable.
  8. Procédé selon la revendication 6, dans lequel l'intensité et/ou la durée dans le temps de l'action est réglée par une régulation ou une commande automatique.
  9. Procédé selon la revendication 8, dans lequel la commande ou la régulation s'effectue sur la base d'une analyse d'exemplaires imprimés ou d'une feuille continue imprimée.
  10. Procédé selon l'une des revendications précédentes, dans lequel un rayonnement électromagnétique, en particulier un rayonnement dans la plage optique des longueurs d'ondes, est utilisé pour l'action.
  11. Procédé selon la revendication 10, dans lequel le rayonnement électromagnétique comprend au moins des composantes UV.
  12. Procédé selon la revendication 10 ou 11, dans lequel le rayonnement présente des composantes spectrales dans une bande d'absorption d'une encre utilisée qui est transférée sur la plaque d'impression (1).
  13. Procédé selon une des revendications précédentes, dans lequel l'action, s'effectue sur la plaque d'impression (1) par l'application d'un champ électrique ou d'un potentiel électrostatique et/ou d'un champ magnétique sur la plaque d'impression (1) et/ou par l'action de chaleur et/ou d'un gaz et/ou d'insufflation d'air et/ou d'un liquide et/ou d'une vapeur sur la plaque d'impression (1).
EP03405111A 2002-03-27 2003-02-21 Procédé pour maintenir l'mage sur une plaque d'impression imagée Expired - Lifetime EP1348547B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10213802 2002-03-27
DE10213802A DE10213802B4 (de) 2002-03-27 2002-03-27 Verfahren zur Erhaltung von Bildinformation einer bebilderten Druckform

Publications (3)

Publication Number Publication Date
EP1348547A2 EP1348547A2 (fr) 2003-10-01
EP1348547A3 EP1348547A3 (fr) 2004-03-10
EP1348547B1 true EP1348547B1 (fr) 2007-05-23

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US (1) US7059246B2 (fr)
EP (1) EP1348547B1 (fr)
JP (1) JP2004291454A (fr)
AT (1) ATE362845T1 (fr)
DE (2) DE10213802B4 (fr)

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US20030183105A1 (en) 2003-10-02
EP1348547A2 (fr) 2003-10-01
JP2004291454A (ja) 2004-10-21
EP1348547A3 (fr) 2004-03-10
DE50307308D1 (de) 2007-07-05
US7059246B2 (en) 2006-06-13
DE10213802B4 (de) 2010-02-18
ATE362845T1 (de) 2007-06-15
DE10213802A1 (de) 2003-10-16

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