EP3009269A2 - Remplissage de couleur d'une plaque d'heliogravure - Google Patents

Remplissage de couleur d'une plaque d'heliogravure Download PDF

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Publication number
EP3009269A2
EP3009269A2 EP15002716.7A EP15002716A EP3009269A2 EP 3009269 A2 EP3009269 A2 EP 3009269A2 EP 15002716 A EP15002716 A EP 15002716A EP 3009269 A2 EP3009269 A2 EP 3009269A2
Authority
EP
European Patent Office
Prior art keywords
printing plate
intaglio printing
areas
ink
intaglio
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.)
Withdrawn
Application number
EP15002716.7A
Other languages
German (de)
English (en)
Other versions
EP3009269A3 (fr
Inventor
Peter Schiffmann
Peter Franz
Günter OLSCHEWSKI
Holger Kleine
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.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP3009269A2 publication Critical patent/EP3009269A2/fr
Publication of EP3009269A3 publication Critical patent/EP3009269A3/fr
Withdrawn legal-status Critical Current

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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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio 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
    • B41N3/003—Preparing for use and conserving printing surfaces of intaglio formes, e.g. application of a wear-resistant coating, such as chrome, on the already-engraved plate or cylinder; Preparing for reuse, e.g. removing of the Ballard shell; Correction of the engraving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • 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
    • B41M1/10—Intaglio printing ; Gravure printing

Definitions

  • the invention relates to a gravure printing method for printing substrate with a printing ink, wherein the substrate is printed by a gravure printing plate, wherein the surface of the intaglio printing plate is provided with first areas which have no ink for transfer to the substrate, and provided with second areas, having the ink for transfer to the substrate.
  • the invention further relates to a gravure printing plate for printing substrate with a printing ink, wherein the surface of the intaglio printing plate has first regions which have no ink for transfer to the substrate, and second regions which have printing ink for transfer to the substrate.
  • intaglio printing process it is known to ink a gravure printing plate which is clamped on a cylinder directly via a stencil plate or indirectly via a blanket cylinder with up to five colors.
  • the coloring is usually done in the form that the different colors that differ in hue or other features, adjacent to each other or slightly overlapping applied to the intaglio printing plate.
  • the selective coloring takes place via stencil plates, which in turn are inked via a short inking unit.
  • the stencil plates are flexible high pressure plates, with raised areas transferring the ink.
  • the excess color is removed outside the engraving by means of a wiping cylinder which is cleaned by a system of brushes and / or sprayers or a dip bath with each revolution. In this case, for example, "wiper" is sprayed onto the wiper cylinder.
  • the ink is transferred from the intaglio printing plate to the substrate, for example banknote paper.
  • the peculiarity of the intaglio printing process compared to the intaglio printing method lies in the extremely high mechanical pressure between the intaglio printing plate and an impression cylinder, so that not only color is transferred to the substrate, but the substrate is also permanently deformed or embossed. This embossment of the substrate is tactile detectable, which leads to an increased protection against counterfeiting, as required for example in banknotes.
  • the wiping cylinder absorbs about 60% of the ink and only about 40% of the ink is transported to the substrate. The overwhelming proportion of the ink is thus not applied to the substrate in the intaglio printing process, but remains unused and must be disposed of or destroyed consuming.
  • the invention is therefore the object of developing a generic intaglio printing such that the disadvantages of the prior art are eliminated.
  • the first areas of the surface of the intaglio printing plate are or are provided with a hydrophobization according to a first alternative, and the second areas of the intaglio printing plate are not provided with a hydrophobization.
  • the first areas of the surface of the intaglio printing plate are provided with a hydrophilic fluid coating to be applied again before each staining of the intaglio printing plate.
  • the first areas of the surface of the intaglio printing plate which are not intended to transfer color to the substrate, are made hydrophobic and repel the paint.
  • the ink can thus accumulate only on the second areas of the surface of the intaglio printing plate, which are not designed to be hydrophobic or are designed to be less hydrophobic than the surrounding areas, that accumulates here the color.
  • the repulsion or poor wetting of the printing ink on the intaglio printing plate works particularly well when the surface energy (measured in mN / m) of the intaglio printing plate is lower than the surface tension (measured in mN / m) of the printing ink.
  • the hydrophobing of the first areas of the surface of the intaglio printing plate is produced by a hydrophobic coating which is applied to the surface of the intaglio printing plate.
  • a hydrophobic coating of the surface of printing plates is known, for example, from lithography.
  • a lithographic stone is treated such that fat-friendly printing areas, such as a drawing, are reinforced in their capacity and the non-printing Regions of the lithographic stone remain fat-repellent and water-receptive or hydrophilic.
  • the color used to label the lithographic stone consists of the basic substances wax, grease, soap and soot.
  • the technique known from lithography can not be transferred to intaglio printing since printing plates or printing cylinders made of a completely different material are used and the printing process is completely different.
  • the intaglio printing plate is thus structured with respect to their surface tension, so that the ink is not or less transmitted to the non-printing areas.
  • the ink is thus only or almost exclusively on the non-hydrophobic areas of the intaglio printing plate, whereas there is no or almost no ink on the hydrophobic areas of the intaglio printing plate.
  • This structuring or hydrophobing of the intaglio printing plate can take place in the region of the non-printing areas, for example with fluoropolymers, silicones or non-stick coatings based on ceramics or SiO 2 nanoparticles.
  • a hydride material consisting of an organic and an inorganic component, which is marketed, for example, under the trade name "Ormocere” (a trademark of the Fraunhofer Deutschen).
  • Ormocere a trademark of the Fraunhofer Deutschen Deutschen Republic.
  • the processing and adhesion of the coating to the intaglio printing plate and, via the inorganic component, the physical strength of the coating can be set particularly advantageously via the organic component of the hydride material.
  • the layer thickness of the applied and dried hydrophobic coatings is approximately between 5 nm and 5 microns, depending on the material of the hydrophobic coating used.
  • stainless steel seals can be used, which are sprayed as an ultra-thin layer on the surface of the intaglio printing plate. These stainless steel seals are applied at a rate of about 10 to 20 ml / m 2 and then dry at room temperature within 30 minutes, with a higher ambient temperature accelerating drying.
  • silane coatings or so-called “easy to clean coatings” which are applied to the intaglio printing plate with a layer thickness of about 10 nm can be used as the hydrophobic coating.
  • the hydrophobic structuring is carried out directly on the intaglio printing plate by means of a cylinder or roller method or a digital printing method such as ink-jet printing.
  • the hydrophobic coatings can also be baked or sintered.
  • the color savings on the hydrophobing of a chromed intaglio printing plate in the non-printing areas is achieved.
  • the color transfer or wetting of spot ink which usually has a surface tension of about 34 mN / m
  • the chromium-plated printing plate which usually has a surface energy of about 40 mN / m, avoided in the non-printing areas.
  • the engraved areas, ie the lower lying, printing areas of the intaglio printing plate, on the other hand, are wetted sufficiently well with ink and are therefore preferably not rendered hydrophobic.
  • the hydrophobic coating is resistant to temperatures of about 80 ° C to about 90 ° C and high contact pressures of about 8 t / cm line pressure against paper. Furthermore, the hydrophobic coating is resistant to abrasion due to friction of the wiping cylinder whose surface is usually made of PVC. In addition, the hydrophobic coating has a resistance to a wash liquor, such as 0.5% to 0.8% NaOH, and / or surfactants, such as sulfated castor oil, for a contact time of about 5 minutes once per hour. Preferably, the hydrophobic coating is stable at least over 150,000 rollovers.
  • the still ungrievATOR intaglio printing plate is provided over its entire surface with a hydrophobic surface.
  • the hydrophobic coating is applied to the intaglio printing plate, for example by means of dip coating, roll coating via applicator roll, blade coating process or spray coating process.
  • a doctor blade traverses the intaglio printing plate at a defined distance from the intaglio printing plate and as it were advances the coating material in front of it, so that only a thin film of the hydrophobic coating agent is transferred to the intaglio printing plate.
  • the spray-coating process is comparable to the painting of automobiles with a spray gun.
  • the engraving of the intaglio printing plate by means of laser or mechanical means, such as rotating stylus, carried out so that the engraved areas of the intaglio printing plate no longer have a hydrophobic surface.
  • the hydrophobing of the first regions of the surface of the intaglio printing plate is produced by microstructures and / or nanostructures which are introduced into the surface of the intaglio printing plate.
  • microstructures and / or nanostructures which are introduced into the surface of the intaglio printing plate.
  • partial or full-surface microstructures or nanostructures which have hydrophobic properties are introduced into the surface of the intaglio printing plate.
  • These microstructures or nanostructures form for example a so-called shark skin or the so-called lotus effect and can be embossed, for example, into the surface of the intaglio printing plate.
  • the first areas of the surface of the intaglio printing plate are or are provided with a hydrophilic fluid coating to be applied again before each staining of the intaglio printing plate.
  • the intaglio printing plate is precoated immediately before each new coloration with water or a hydrophilic emulsion or solution in the non-printing areas, so that no color transfer takes place at these locations.
  • a hydrophilic emulsion or solution is, for example, an alcohol / water mixture and more preferably an alcohol having a boiling temperature higher than water in order to prevent evaporation on the intaglio printing plate whose surface in practice has a temperature of about 80 ° C slow it down.
  • a trihydric alcohol such as glycerol with a very high boiling range is possible.
  • hydrophilic fluid coating is such that it completely wets the stitch printing plate in the non-printing areas and is immiscible with the printing inks used to color the stitch printing plate or the ink is not soluble in the hydrophilic fluid coating.
  • the hydrophilic fluid coating serves as a temporary separating layer between printing ink and engraving printing plate.
  • the hydrophilic fluid coating is particularly preferably transparent or colorless so as to have no influence on the hue of the printing motif.
  • the hydrophilic fluid coating is emulsified in low concentrations of preferably 2% to 10% in the printing ink. Due to the large surface of the ink fountain roller (which is the roller immersed in the ink fountain in the ink) and the associated low ink layer thickness, the hydrophilic fluid coating evaporates, so that an uncontrolled enrichment of the hydrophilic fluid coating in the ink is avoided.
  • the remaining hydrophilic fluid coating on the stitch pressure plate is removed by a wiping operation by means of wiper liquor from the printing plate.
  • the hydrophilic fluid coating is transported in low concentrations in the wiper solution. This means that the hydrophilic fluid coating must be soluble in the wiper and have a neutral pH.
  • the application of the hydrophilic coating takes place by means of a blanket cylinder directly on the intaglio printing plate.
  • the application of the hydrophilic coating can take place via a spray device on the blanket cylinder or via an intermediate cylinder.
  • the application of the hydrophilic coating can also be controlled via a squeeze cylinder.
  • An application by means of a cylinder ensures that only the upper, non-printing area and not the engraving is wetted.
  • the order is expediently always carried out immediately before the inking of the intaglio printing plate, for example in a intaglio printing machine with direct staining always before each staining by means of stencil plate and in an indirect coloring prior to coloring the intaglio printing plate by means of collecting cylinder.
  • the moistening is particularly preferably immediately before the coloring of the intaglio printing plate.
  • the non-printing regions of the intaglio printing plate are provided with a hydrophilic coating.
  • a hydrophobic wash ink is applied to the intaglio printing plate, wherein the hydrophobic wash ink remains only in those areas of the intaglio printing plate on which there is no hydrophilic coating, ie the printing areas of the intaglio printing plate.
  • the collecting cylinder (or else Orlofzylinder called) accurately hydrophobic to the structures or engravings of the intaglio printing plate as a negative image element.
  • digital printing methods are particularly suitable. This has the particular advantage that not the entire collecting cylinder must be charged with color, but only the areas that subsequently transfer the color to the intaglio printing plate. This achieves a further saving of printing ink.
  • Another particular advantage of the invention is that in a gravure printing plate with uniform or at least almost uniformly deep engravings on the wiping cylinder can either be dispensed with completely or the wiping cylinder can be partially milled, as evenly distributed by the invention, the inking in the ink-transferring areas of the intaglio printing plate is thick and no or at least almost no color is transferred to the non-printing areas of the intaglio printing plate, which consequently do not have to be wiped.
  • the substrate which is printed with the intaglio printing plate according to the invention is particularly preferably made of paper from cotton fibers, as used for example for banknotes, or from other natural fibers or from synthetic fibers or a mixture of natural and synthetic fibers, or from at least one plastic film.
  • the substrate consists of a combination of at least two superimposed and interconnected different substrates, a so-called hybrid.
  • the substrate consists for example of a combination of plastic film-paper-plastic film, ie a paper substrate is on each of its two sides by a Plastic film covered, or a combination of paper-plastic film paper, ie a substrate made of a plastic film is covered on each side by paper.
  • the font DE 102 43 653 A9 in particular states that the paper layer usually has a weight of 50 g / m 2 to 100 g / m 2 , preferably from 80 g / m 2 to 90 g / m 2 .
  • any other suitable weight can be used.
  • Documents of value in which such a substrate or security paper can be used are, in particular, banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers which are subject to counterfeiting, such as passports and other identity documents, as well as cards, such as credit cards. or debit cards whose card body has at least one layer of security paper, and also product securing elements such as labels, seals, packages and the like.
  • the simplified term value document includes all the above materials, documents and product safeguards.
  • Fig. 1 shows in side view schematically the process of color transfer in intaglio printing, as it is known from the prior art.
  • a printing cylinder 1 serves as a counter-pressure cylinder to a plate cylinder 2 to transfer the color with high contact pressure to the substrate 5.
  • chromed intaglio printing plates are applied. Engravings on the intaglio printing plates are filled with color by a color collecting cylinder 3.
  • the engraving lower areas
  • the excess ink is removed by the wiping cylinder 4 running at a peripheral speed other than the plate cylinder 2.
  • Fig. 2 shows in side view another simplified representation of the intaglio printing method, as is known from the prior art.
  • Three stencil cylinders 6.1, 6.2 and 6.3 which are covered with a flexible high-pressure plate, dye a collecting cylinder 7 (also called Orlofzylinder) with three different printing inks. Preferably, the three colors are not applied overlapping.
  • the collecting cylinder 7 then colors the intaglio printing plate 8 with engravings 9.
  • the excess ink on non-printing areas is removed by means of the wiping cylinder 10.
  • the wiping cylinder 10 is cleaned by wiper in each revolution.
  • the wiper liquor can be applied to the wiping cylinder via a dipping or spraying device 11. Using brush systems, the cleaning effect can be further improved.
  • Fig. 3 shows in side view the application of color 12 according to the prior art on the (here just shown) intaglio printing plate 8 by means of collecting cylinder 7 in cross section before the wiping process.
  • Fig. 4 shows the coloring of the intaglio printing plate 8 Fig. 3 during the wiping process.
  • the remote by means of wiper cylinder 10 color 13 is now on the wiper cylinder 10th
  • the following figures show embodiments of the invention.
  • the arrows indicate the direction of rotation of the respective cylinder or the direction of movement of printing devices relative to intaglio printing plate.
  • Fig. 5 shows a side view of the application of color 12 to an inventively hydrophobically coated intaglio printing plate 8 by means of collecting cylinder 7 before the wiping process.
  • color from the collecting cylinder 7 does not arise the intaglio printing plate 8 transmitted. This means that only the partial areas of color are transferred from the collecting cylinder, which affect the engraving area. The remaining paint 14 still adheres to the collecting cylinder. 7
  • Fig. 6 shows in side view an embodiment in which a hydrophobic coating 16 is applied by means of a job cylinder 15, so that only the non-printing areas and not the engraving is coated on the Druckbei ein the order cylinder 15 for intaglio printing plate 8. Via a doctor blade 17 (blade gap), the order quantity of the hydrophobic coating 16 is metered onto the application cylinder 15.
  • the hydrophobizing agent could also be transferred to the applicator cylinder by means of a spraying device, an inkjet printhead or a roller system according to the Abqetsch principle. In the latter system, the amount of hydrophobizing agent is metered to one another via the pressure supply of rollers to one another via the or different peripheral speeds.
  • Fig. 7 shows in side view an embodiment in which the hydrophobic coating 16 by means of a digital printing process, for example by means of an ink-jet print head 18, accurately applied to the non-printing areas of intaglio printing plate 8.
  • the print data (engraving surfaces) are generally available in digital form or can be generated relatively easily.
  • the intaglio printing plate 8 is first scanned and, based on this data, a print of the hydrophobic coating 16 is made, wherein an inversion of the scanned image data is required.
  • the engraving of intaglio printing plate 8 is first coated with a wash ink 19, for example by means of a digital printing method via an ink-jet print head 18.
  • the printing plate is provided by means of a dip or a spray coating process with the hydrophobic coating.
  • the wash color is dissolved by means of a suitable solvent, for example water, and removed from the printing plate.
  • a suitable solvent for example water
  • the hydrophobic coating applied over the wash color is also removed. The washing process thus prevents a hydrophobic coating of the engraving and thus leads to a color wetting in the engraving.
  • the solvent can also by means of a high pressure device (also tempered) with high pressure (2 bar to 15 bar) and with the aid of brush systems (may be rotating or standing brushes) are applied.
  • a high pressure device also tempered
  • high pressure 2 bar to 15 bar
  • brush systems may be rotating or standing brushes
  • Fig. 9 shows in side view the application of the hydrophobing agent 16 by means of a spray coating method via a spray head 20 after application the wash ink 19 in the engraved areas of intaglio printing 8.
  • Fig. 10 shows in side view the removal of the wash ink 19 after application of the hydrophobizing agent 16 by means of a spray coating process.
  • the solvent 22 is sprayed onto the intaglio printing plate 8 coated with wash ink 19 and hydrophobizing agent 16.
  • the solvent dissolves the wash ink 19 and thus the hydrophobizing agent 16 from the printing plate, so that the hydrophobing agent 16 remains only on the areas of the intaglio printing plate 8, on which there is no wash ink 19.
  • the removal of the wash ink 19 after application of the hydrophobizing agent 16 may also be effected by means of a laser.
  • the wash ink 19 additionally contains absorbers which are tuned to the wavelength of the laser. The wash ink is thus ablated by the laser and additionally tears away the hydrophobic coating located directly above it. Subsequently, by means of a water jet and / or a rotating brush, a final cleaning done to ensure that all impurities are removed from the engraving.
  • the laser may be an Nd: Yag laser, wherein the wash ink contains carbon black as an absorber for the light of the laser at a wavelength of 1065 nm.
  • Fig. 11 shows in side view an embodiment of the invention for a temporary coating of intaglio printing plate 8 with a fluid, for example water or an alcohol-water mixture.
  • the device consists of a curved intaglio printing plate 8 with engravings 9, a Application cylinder 23, with which the fluid is applied to the intaglio printing plate 8, a squeezing cylinder 24 for controlling the amount of fluid and a dipping or scooping cylinder 25 to remove the fluid from the reservoir 26.
  • Fig. 12 shows a side view of an embodiment of the invention with the pressure plate 8 and a recess 9.
  • a stencil plate 28 with a raised 29 and the ink 19 applied thereon transfers the ink to the intaglio printing plate 8.
  • the hydrophobic coating 16 does not have in the entire area of non-printing areas the intaglio printing plate 8 are applied to achieve the goal of the color saving or larger amount of the transferred ink to the substrate. It is already sufficient to hydrophobize the overlap of the stencil plate for engraving. Therefore, the hydrophobic coating 16 is applied only in the overlapping region 27 between the elevation 29 and the engraving 9 outside the engraving 9.
  • Fig. 13 shows in plan view an embodiment of the invention with the intaglio printing plate 8 and the engraving 9.
  • the hydrophobic coating 16 is recessed in the screened edge region 30 around the engraving 9 grid-like. This ensures that the ink is not torn off during the wiping process from the edge of the engraving and an optimal and over the entire area of the engraving 9 uniform filling of the engraving 9 takes place with the ink.

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EP15002716.7A 2014-09-29 2015-09-18 Remplissage de couleur d'une plaque d'heliogravure Withdrawn EP3009269A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014014062.8A DE102014014062A1 (de) 2014-09-29 2014-09-29 Farbfüllung einer Stichtiefdruckplatte

Publications (2)

Publication Number Publication Date
EP3009269A2 true EP3009269A2 (fr) 2016-04-20
EP3009269A3 EP3009269A3 (fr) 2016-06-29

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Application Number Title Priority Date Filing Date
EP15002716.7A Withdrawn EP3009269A3 (fr) 2014-09-29 2015-09-18 Remplissage de couleur d'une plaque d'heliogravure

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EP (1) EP3009269A3 (fr)
DE (1) DE102014014062A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10243653A9 (de) 2002-09-19 2006-11-23 Giesecke & Devrient Gmbh Sicherheitspapier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1564653A (fr) * 1968-02-12 1969-04-25
CH484752A (de) * 1968-12-12 1970-01-31 De La Rue Giori Sa Stahlstichdruckplatte
CA1116461A (fr) * 1977-01-28 1982-01-19 Daniel Beaune Methode d'heliogravure, et machine connexe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10243653A9 (de) 2002-09-19 2006-11-23 Giesecke & Devrient Gmbh Sicherheitspapier

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Publication number Publication date
DE102014014062A1 (de) 2016-03-31
EP3009269A3 (fr) 2016-06-29

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