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
  • B41C1/055—Thermographic processes for producing printing formes, e.g. with a thermal print head

Definitions

• the invention relates to a method for the production of printing plates according to the preamble of patent claim 1.
• the present invention relates to a method for producing a permanent and erasable image on such a rewritable printing form.
• a printing master base cylinder is preferably subjected to an erasing step and an imaging step.
• the imaging of the printing form is followed by fixing and conditioning of the imaged printing form.
• An erase device which can be used in erasing such a printing form is disclosed, for example, in US Pat DE 100 08 214 A1 disclosed.
• the DE 100 23 319 A1 discloses a device for imaging such printing forms.
• Further basic features of the DICOweb technology reference can be made to " Handbuch der Printmedien, Helmut Kipphan, pages 674 - 680, year 2000, Springer-Verlag ".
• the present invention is based on the problem to provide a novel method for the production of printing plates.
• Producing a permanent and erasable image on a rewritable printing form then ideally involves only the steps of erasing and imaging, with the steps of fixing and hydrophilizing through the plasma treatment becoming superfluous. This drastically reduces the number of devices or devices required to produce the rewritable and erasable printing plates. This results in a reduction in the required space, a reduction in investment costs and a reduction in the time required for retooling. Further advantages of the process according to the invention are a clean surface, adhesion support, correct surface tension to support the hydrophilicity.
• the method comprises without delays in the sequence of the individual process steps, ie without timers between the individual steps, only the steps deleting, imaging and printing.
• the method comprises the steps of: deleting, timer (15 to 30 minutes), preparing, imaging and printing.
• the inclusion of the gumming step in the process of the invention allows for a timer between imaging and printing, such that the process includes the steps of erasing, imaging, gumming, timing (15 to 30 minutes), printing.
• the method according to the invention including the possible timers can be represented in particular as follows: erase, timer, preparation, imaging, gumming, timer, printing.
• the atmospheric plasma acts to extinguish the surface, or fixing, or preparing, in particular hydrophilizing the same with different power densities on the surface to be erased or imaged.
• the present invention relates to a method for producing a printing form, namely to produce a permanent and erasable image on the surface of a rewritable and erasable printing form, wherein the method is preferably carried out within a printing press.
• a printing form or a printing form base cylinder with a rewritable and erasable surface is provided. The surface is first deleted and then imaged.
• the atmospheric plasma for extinguishing the surface is provided by means of a plasma generating device, wherein the plasma generating means comprises at least two electrodes positioned at a distance from the surface of the printing form, between each of which an electric arc is formed. This results in large quantities of positive or negative charge carriers, which are conducted via compressed air onto the surface to be extinguished. With a correspondingly high power density of the atmospheric plasma, the surface of a printing plate can thus be effectively cleaned or extinguished.
• the same is subjected to a plasma treatment with atmospheric plasma in the sense of the present invention immediately before the actual imaging of the surface so that the imaging of the surface takes place directly after the plasma treatment via the thermal transfer process known from the prior art can.
• a plasma treatment for erasing the surface to be imaged with the atmospheric plasma and the actual imaging of the same with the aid of the thermal transfer process can then be a period of up to 30 minutes, preferably a maximum of 15 minutes, ie a timer.
• the atmospheric plasma is in turn formed by an electric arc between at least two electrodes of the plasma generating device, which are positioned at a distance from the surface to be imaged.
• the power density of the plasma treatment or of the atmospheric plasma during preparation and fixing is preferably lower than the power density of the plasma treatment or of the atmospheric plasma when the printing form is extinguished.
• the power density for fixing is preferably larger than the power density for preparing.
• the adhesion of the imaging material to be applied by the thermal transfer method can be improved by the plasma treatment immediately before the imaging of the printing form in such a way that it is possible to dispense with a fixing step subsequent to the imaging according to the prior art.
• the surface of the printing plate which usually consists of a metal, is influenced by the plasma treatment in such a way that it has good dampening wet-wetting properties in the sections in which no imaging material is applied, thus dispensing with the hydrophilization step required according to the prior art can be.
• Immediately after imaging is therefore a print-ready printing form, so that immediately after the imaging can be started with the printing.
• the steps of fixing and hydrophilizing become superfluous by the plasma treatment.
• the atmospheric plasma with different power densities acts on the surface to be erased or imaged, whereby when the surface is erased, the plasma has a higher power density than when preparing for imaging.
• the different power densities can be adjusted by operating the plasma generating device with different intensities. It is also possible to adjust the distance of the plasma generating device to the surface of the printing plate. Then, when the printing forme production takes place within a printing press, the plasma generating device is positioned together with an imaging device on a traverse and is moved in translation relative to the printing plate with rotating printing form. In this case, the power density can also be adjusted by adjusting the speed of the translatory relative movement of the plasma generating device relative to the rotating printing plate and / or the rotational speed of the rotating printing plate.

Landscapes

• Manufacture Or Reproduction Of Printing Formes (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Printing Plates And Materials Therefor (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=36922265

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Citations (5)

Family Cites Families (8)

• 2005
  • 2005-06-22 DE DE102005028817A patent/DE102005028817A1/de not_active Withdrawn
• 2006
  • 2006-06-14 JP JP2006165285A patent/JP2007001305A/ja not_active Withdrawn
  • 2006-06-17 EP EP06012495A patent/EP1736823A3/fr not_active Withdrawn
  • 2006-06-21 US US11/472,212 patent/US20070006761A1/en not_active Abandoned

Patent Citations (5)

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