EP2888112B1 - Method for producing a value document - Google Patents

Method for producing a value document Download PDF

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Publication number
EP2888112B1
EP2888112B1 EP13722684.1A EP13722684A EP2888112B1 EP 2888112 B1 EP2888112 B1 EP 2888112B1 EP 13722684 A EP13722684 A EP 13722684A EP 2888112 B1 EP2888112 B1 EP 2888112B1
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EP
European Patent Office
Prior art keywords
drying
printing
value document
substrate
room temperature
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.)
Not-in-force
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EP13722684.1A
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German (de)
French (fr)
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EP2888112A2 (en
Inventor
Alexander Bornschlegl
Christoph Mengel
Andreas BAADER
Günter OLSCHEWSKI
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Giesecke and Devrient GmbH
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Giesecke and Devrient GmbH
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Publication of EP2888112A2 publication Critical patent/EP2888112A2/en
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Publication of EP2888112B1 publication Critical patent/EP2888112B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/0443—Drying sheets, e.g. between two printing stations after printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/045—Drying sheets, e.g. between two printing stations by radiation
    • B41F23/0453—Drying sheets, e.g. between two printing stations by radiation by ultraviolet dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes

Definitions

  • the invention relates to a method for producing a value document, such as a banknote, a document or a document of identification.
  • the printing equipment of the subsequent printing steps can be adjusted, which is associated with high costs and high costs.
  • the drying of a printed value document substrate can be further accelerated by the addition of metal-containing driers.
  • Oxidatively drying inks i.e., non-UV inks or UV inks
  • Drying agents are, in particular, organic salts of certain metals, such as cobalt (e.g., cobalt octoate, cobalt naphthenate), manganese, calcium (e.g., calcium octoate), zirconium, or cerium.
  • Metal-containing driers develop their effect only in the presence of oxygen. Provided that storage and transport are largely carried out under exclusion of air, a dry matter can already be incorporated into the paint ex works.
  • the disadvantage of these driers is that the use of (heavy) metal compounds for reasons of work-related safety and health hazards are problematic. A low use concentration would therefore be desirable, but this leads to long drying times.
  • the drying of a printed value-added substrate can be accelerated by the addition of peroxide-containing substances, such as inorganic or organic peroxides.
  • peroxide-containing substances such as inorganic or organic peroxides.
  • This also works in places where air or oxygen deficiency prevails, consequently also in non-impacting substrates and in high or large value document stacks.
  • the disadvantage is that peroxide-containing substances of color may be added relatively shortly before printing, because the color can not be stored for a longer period of time by the onset of the addition of the peroxide chemical reaction.
  • the WO 2009/013169 describes the drying of inks wherein an oxidatively curing ink comprises a combination of meltable wax and a UV-chelating binder component.
  • step b) the treatment of the value document substrate with UV radiation and additionally with ozone takes place.
  • the additional treatment with ozone is preferably carried out by applying the value document substrate with ozone in room air at a concentration in the range of 1 to 15 ppm.
  • step b) the treatment with UV radiation is carried out by a (simultaneous) printing machine equipped with a UV drying system, preferably a UV dose rate of 10 mJ / cm 2 to 200 mJ / cm 2 per side is selected. A UV dose rate of 15 mJ / cm 2 to 80 mJ / cm 2 per side is particularly preferred.
  • the measurement of the UV dose can be carried out by means of a photochromic film, for example by means of a 70 mm x 19 mm measuring strip "tesa® UV Strip" from Dr. Ing. Hönle AG.
  • step c) drying is preferably carried out at room temperature. Furthermore, it is preferred to carry out the drying of the value documents in the form of a document of value document, wherein the document of value documents, in particular 200 to 10,000 sheets, preferably 5000 to 7000 sheets.
  • the inventive method is applicable to all conventional value document substrates, in particular paper substrates, polymer substrates and so-called hybrid substrates, which are to be understood composite film substrates, either a paper-based core and polymer-based outer layers or a core of a plastic material and outer layers on a paper basis. It is preferred to use substrates based on cotton fibers.
  • the substrate may have certain coatings, impregnations or imprints and / or security elements or film elements.
  • a polymer substrate or composite substrate having a core of paper and polymer-based outer layers, it is desirable Apply to the polymeric material one or more coatings that ensure the adhesion of the applied to the respective substrate printing.
  • This layer applied to the polymeric material is commonly referred to as the ink accepting layer.
  • ink receiving layers are usually dispensable, but the paper substrate can be wholly or partially coated to provide it with certain properties, such as luminescent properties due to applied luminescent substances.
  • Oxidatively drying inks include (or consist of the following components): oxidatively drying film formers, (color) pigments, fillers, solvents, and additives.
  • the film former is that component of the binder which is essential for the formation of the film (see also: Thomas Brock: “textbook of paint technology", 2nd edition, Curt R. Vincentz Verlag, 2000, page 190 ). Film formers are especially macromolecular organic substances.
  • the term “binder” refers to the non-volatile content of a coating material without pigment and filler, but including plasticizers, driers and other nonvolatile excipients.
  • nonvolatile fraction is to be understood here as the non-volatile fraction according to ISO 4618.
  • oxidatively drying film former which can be used for the oxidatively drying printing ink
  • film former molecules which can be linked to aliphatic double bonds by the action of atmospheric oxygen via oxygen bridges are preferred.
  • oxidatively drying alkyd resins, Urethanalkyde, epoxy resin esters with unsaturated fatty acids, oil-modified phenolic resins, and natural or synthetic Triglycerides with at least partially unsaturated fatty acid residues as film formers preferred.
  • the oxidatively drying ink may preferably comprise driers or siccatives, especially organic salts of certain metals such as cobalt (e.g., cobalt octoate, cobalt naphthenate), manganese, calcium (e.g., calcium octoate), zirconium, cerium, zinc, lead, or iron.
  • Organic acids especially higher fatty acids such as linseed oil fatty acid or tall oil fatty acid, rosin acids, naphthenic acid or 2-ethylhexanoic acid can be used to form the organic salts.
  • the dry substances catalyze the oxygen transfer from the air by redox reactions and accelerate film formation by polymerization.
  • the oxidatively drying printing ink is in particular a background printing ink.
  • the step of treating the printed value document substrate with UV radiation is expediently carried out by using UV drying systems which can be based in particular on medium-pressure mercury UV lamps or iron or gallium-doped medium-pressure mercury UV lamps.
  • the emitter power per lamp is in the range of 120 W / cm to 250 W / cm, preferably 180 W / cm.
  • a suitable emitter system are, for example, the units BLK-5 or BLK-2 offered by the company IST METZ GmbH.
  • the method expediently takes place at a printing speed of 8000 to 12000 sheets / h, in particular 10,000 sheets / h, and a setting of a single-jet dose rate within a range of 4 mJ / cm 2 to 100 mJ / cm 2 .
  • the step of drying the UV-treated printed value-added substrate is at room temperature or elevated temperature.
  • room temperature is meant herein a temperature of 20 ° C.
  • the drying at elevated temperature can be carried out in particular at a temperature in a range of 35 ° C to 40 ° C.
  • the step of drying the value documents in the form of a document of value document In order to avoid the shrinkage of the value document substrate, it is preferred to perform the step of drying the value documents in the form of a document of value document.
  • the value document stack may in particular have 200 to 10,000 signatures, preferably 5000 to 7000 signatures. A value document stack with approximately 6000 signatures is particularly preferred for drying. Furthermore, it is preferred that the stack core temperature does not exceed a temperature of 40 ° C.
  • the drying of the value documents in the form of a document of value document is preferably carried out at room temperature.
  • a suitable for printing with conventionally drying inks suitable simultaneous printing machine with retrofitted UV drying system of IST Metz ("BLK-5", two spotlights per side with a radiator output of 180 W / cm) was used.
  • Cotton velor paper was printed on both sides in a simultaneous sheetfed press with one offset and two letter set inks.
  • the paints contained 3% by weight cobalt / manganese salt drier.
  • the printing speed was 8000 sheets / h.
  • the signatures were dried at room temperature in stacks of 6000 sheets each and could be further processed by intaglio printing after 48 hours at the earliest. After connecting two UV aggregates (IST Metz, model "BLK-5”) on each side at 40% of the maximum output and subsequent drying at room temperature in stacks of 6000 sheets each, further processability by intaglio printing could be achieved after only 20 hours.
  • the paper substrate is not appreciably changed in dimension or spatial dimension, whereas a higher heat input by hot air leads to a higher shrinkage of the substrate , In the event that increased shrinkage is desired, the power of the UV lamps can be increased.
  • Cotton velor paper was printed on both sides in a simultaneous sheetfed press with three letter set colors each.
  • the paints contained 3% by weight cobalt / manganese salt drier.
  • the printing speed was 10,000 sheets / h.
  • the signatures were dried at room temperature in batches of 6000 sheets each until further processing. Five sheets each from the stack top, the stack center and the bottom of the stack were taken from the stack after one hour, measured and the average of the measured values determined.
  • Cotton velvet paper with film elements applied in subregions was printed on both sides in each case with one offset and three letter set inks in a simultaneous sheetfed press.
  • the paints contained 3% by weight cobalt / manganese salt drier.
  • the printing speed was 8000 sheets / h.
  • the film areas that were printed with the wet offset ink were not sufficiently dried in the arrangement of the printed sheets in the stack, so that strong deposition was observed in the stack on the respective next sheet back page.
  • the print strips were dried open in the room air at a temperature of 20 ° C for four hours.
  • the print strips were irradiated immediately after printing in a continuous UV belt dryer at the indicated UV dose rate.
  • the UV lamps used were both normal mercury UV medium-pressure lamps (company IST, spectra type CK) and iron-doped mercury UV medium-pressure lamps (company IST, spectrum type CK-II).
  • the print strips were also fixed on a metal support for rapid heat dissipation. The temperature of the printing strips reached room temperature again after only 5 to 10 seconds after the dryer had been run through. The strips were then dried next to the reference strips for four hours.
  • the printing strips were dried in a drying oven at 35 ° C. for one, two or three hours immediately after printing. After each time, the strips were removed from the oven and further dried at room temperature for the remaining time to the total drying time of four hours, in addition to the reference stiffeners.
  • the printing strips were fumigated immediately after printing in a chamber with a mixture of atmospheric air and ozone under the conditions indicated at room pressure. At the end of the indicated time, the strips were removed from the chamber and further dried at room temperature for the remaining time to the total drying time of four hours, in addition to the reference stiffeners.
  • the connected ozone generator was operated with dried room air and worked with a corona discharge.
  • FIG. 1 shows the transferred by the compression of the unprinted substrate amount of ink. The larger this is, the worse the color was dried at the time of the Abklatschs.
  • a dry-free paint at room temperature has to dry for at least a week or more until the signatures can be further processed. So there is no industrial production possible.
  • the drying in the oven also requires a relatively long drying time and also changes the dimension of the paper substrate.
  • a three-hour heat input can not achieve a significant effect compared to the reference.
  • UV radiation already achieves a measurable effect.
  • FIG. 2 shows the transferred by the compression of the unprinted substrate amount of ink. The larger this is, the worse the paint was dried.
  • FIG. 3 shows the transferred by the compression of the unprinted substrate amount of ink. The larger this is, the worse the paint was dried.
  • UV radiation compared to the reference can achieve effects in the order of magnitude that otherwise can only be caused by heat. Ozone also shows a beneficial effect.

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  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
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  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Wertdokuments, wie eine Banknote, eine Urkunde oder ein Ausweisdokument.The invention relates to a method for producing a value document, such as a banknote, a document or a document of identification.

Bei der Herstellung von Wertdokumenten erfolgt der Druckvorgang zumeist in mehreren Druckschritten, wobei vielfältige aufeinanderfolgende Druck-und Veredelungsverfahren zum Einsatz kommen können. Einer der ersten Schritte ist hierbei in der Regel ein einfarbiger oder mehrfarbiger Untergrunddruck im Offset- und/oder Letterset-Verfahren. Die hierfür verwendete Druckausstattung kann stark variieren und ist von den folgenden Parametern abhängig:

  • die verwendeten Sicherheitsfarben bzw. Sicherheitspigmente;
  • die Art des verwendeten Wertdokumentsubstrats (z.B. Substrate auf Basis von Baumwollfasern; auf Mischfasern beruhende Substrate; Substrate auf Basis von Kunststofffolien);
  • die Bereitstellung von zu bedruckenden Substraten, die einen inhomogenen Aufbau aufweisen (z.B. Papiersubstrate, die mit einem Folienelement versehen sind; teilweise vorbedruckte Substrate);
  • die Bereitstellung von zu bedruckenden Substraten, die an verschiedenen Stellen einen unterschiedlichen pH-Wert und/oder eine unterschiedliche Papierfeuchte aufweisen.
In the production of value documents, the printing process is usually carried out in several printing steps, wherein a variety of successive printing and finishing processes can be used. One of the first steps here is usually a monochrome or multicolored background printing in the offset and / or Letterset method. The printing equipment used for this can vary greatly and depends on the following parameters:
  • the safety colors or safety pigments used;
  • the type of value document substrate used (eg, cotton fiber based substrates, mixed fiber based substrates, plastic film based substrates);
  • the provision of substrates to be printed which have a nonhomogeneous structure (eg paper substrates provided with a film element, partially preprinted substrates);
  • the provision of substrates to be printed, which have at different locations a different pH and / or a different paper moisture.

Während Produktionsfehler, die zu einer sichtbaren Verschlechterung des Druckergebnisses führen, bereits an der Druckmaschine entdeckt und ausgeglichen werden können (z.B. die Farbführung), besteht bei sich auf die Substrattrocknung und/oder die Substratabmessungen auswirkenden Produktionsfehlem die Gefahr, dass diese den weiteren Produktionsprozess stark verzögern und zudem die Makulaturmenge erhöhen. Die für die Bedruckung notwendigen unterschiedlichen Druckausstattungen haben zudem einen starken Einfluss auf das Verhalten der Druckbögen in den weiteren Druckschritten. Druckschritte, die Wärme zuführen, führen zu Substratschrumpfungen. Bei Druckschritten, die unter hohem mechanischem Druck erfolgen, zeigen sich Dimensionsveränderungen (insbesondere Dimensionsvergrößerungen) am Substrat. Vor allem der im Wertpapier- und Sicherheitsdruck weitverbreitete Stichtiefdruck belastet Substrat und Farbschichten in besonderer Weise, so dass eine ausreichende Trocknung essentiell ist.While production errors, which lead to a visible deterioration of the printing result, can already be detected and compensated on the printing press (for example the color guide), there is a risk that production delays affecting the substrate drying and / or the substrate dimensions will greatly delay the further production process and also increase the waste volume. The different printing equipment required for the printing also have a strong influence on the behavior of the signatures in the other Printing steps. Pressure steps that introduce heat lead to substrate shrinkage. In printing steps that take place under high mechanical pressure, dimensional changes (in particular dimensional enlargements) on the substrate are evident. In particular, the intaglio printing, which is widespread in securities and security printing, places a particular burden on the substrate and ink layers, so that adequate drying is essential.

Wenn die Dimensionsveränderungen am Substrat bestimmte Toleranzgrenzen überschreiten, bleibt oft nur der Neudruck mit einer veränderten Druckausstattung. Alternativ kann die Druckausstattung der nachfolgenden Druckschritte angepasst werden, was mit hohem Aufwand und hohen Kosten verbunden ist.If the dimensional changes on the substrate exceed certain tolerance limits, often only the reprint with an altered printing equipment remains. Alternatively, the printing equipment of the subsequent printing steps can be adjusted, which is associated with high costs and high costs.

Die mangelnde Trocknung eines bedruckten Wertdokumentsubstrats infolge einer problematischen Farbrezeptur oder infolge eines nicht wegschlagenden Substrats lässt sich zum Teil durch die Zufuhr von Wärme beschleunigen. Allerdings führt die Erwärmung von Druckerzeugnissen häufig zu einer schlecht kontrollierbaren Veränderung der Abmessungen des bedruckten Substrats. Dies ist insbesondere bei Zellulose-, Baumwoll- und weiteren Papiersubstraten der Fall, bei denen der Wärmeeintrag zu Feuchtigkeitsverlust führt. Als Folge kann der Passer bei den nachfolgenden Druckschritten oft nicht eingehalten werden. Auch bei der Verwendung von Kunststoffsubstraten oder hybriden Substraten (z.B. mehrlagige Folie/Papier/Folie-Substrate, wie sie aus WO 2004/028825 A2 bekannt sind) tritt der Effekt auf. Ein weiterer Nachteil besteht darin, dass sich das Ablegen von Druckfarbe innerhalb eines Stapels von Wertdokumenten auf diese Weise nicht wesentlich verbessern lässt. Das Ablegen von Druckfarbe bezeichnet hierin die Erscheinung, dass sich die noch nasse Druckfarbe am nächsten Druckbogen abbildet und dort das Druckergebnis stört.The lack of drying of a printed value document substrate due to a problematic colorant formulation or due to a non-repulsive substrate can be accelerated in part by the supply of heat. However, the heating of printed products often leads to a poorly controllable change in the dimensions of the printed substrate. This is especially the case with cellulosic, cotton and other paper substrates in which the heat input leads to moisture loss. As a result, the register can often not be complied with during the subsequent printing steps. Also in the use of plastic substrates or hybrid substrates (eg multilayer film / paper / film substrates, as is WO 2004/028825 A2 known) occurs the effect. A further disadvantage is that the deposition of ink within a stack of value documents can not be significantly improved in this way. The laying down of printing ink here denotes the phenomenon that the still wet printing ink forms on the next printed sheet and disturbs the printing result there.

Die Trocknung eines bedruckten Wertdokumentsubstrats lässt sich des Weiteren durch den Zusatz von metallhaltigen Trockenstoffen beschleunigen. Oxidativ trocknende Druckfarben (d.h. Druckfarben, die nicht zu den UV-Farben oder UV-Lacken gehören) enthalten üblicherweise einen Trockenstoff bzw. Sikkativ. Trockenstoffe sind insbesondere organische Salze bestimmter Metalle wie Cobalt (z.B. Cobaltoctoat, Cobaltnaphthenat), Mangan, Calcium (z.B. Calciumoctoat), Zirkonium oder Cer. Metallhaltige Trockenstoffe entfalten lediglich in der Anwesenheit von Sauerstoff ihre Wirkung. Unter der Voraussetzung, dass Lagerung und Transport weitgehend unter Luftabschluss erfolgen, kann ein Trockenstoff bereits ab Werk in die Farbe eingearbeitet werden. Der Nachteil an diesen Trockenstoffen ist allerdings, dass die Verwendung von (Schwer-)Metallverbindungen aus Gründen der arbeitsbedingten Sicherheits- und Gesundheitsgefährdungen problematisch sind. Eine geringe Einsatzkonzentration wäre daher wünschenswert, was aber zu langen Trocknungszeiten führt.The drying of a printed value document substrate can be further accelerated by the addition of metal-containing driers. Oxidatively drying inks (i.e., non-UV inks or UV inks) typically include a siccative. Drying agents are, in particular, organic salts of certain metals, such as cobalt (e.g., cobalt octoate, cobalt naphthenate), manganese, calcium (e.g., calcium octoate), zirconium, or cerium. Metal-containing driers develop their effect only in the presence of oxygen. Provided that storage and transport are largely carried out under exclusion of air, a dry matter can already be incorporated into the paint ex works. However, the disadvantage of these driers is that the use of (heavy) metal compounds for reasons of work-related safety and health hazards are problematic. A low use concentration would therefore be desirable, but this leads to long drying times.

Die Trocknung eines bedruckten Wertdokumentsubstrats lässt sich darüber hinaus durch den Zusatz von peroxidhaltigen Stoffen, wie etwa anorganische oder organische Peroxide, beschleunigen. Diese setzen beim Zerfallen radikalischen Sauerstoff frei und beschleunigen so die oxidative Trocknung der Farbschicht. Dies funktioniert auch an Stellen, an denen Luft- bzw. Sauerstoffmangel herrscht, folglich auch bei nicht wegschlagenden Substraten und in hohen bzw. großflächigen Wertdokument-Stapeln. Von Nachteil ist allerdings, dass peroxidhaltige Stoffe der Farbe erst verhältnismäßig kurz vor dem Druck hinzugefügt werden dürfen, weil die Farbe durch die mit dem Hinzufügen des Peroxids einsetzende chemische Reaktion nicht über einen längeren Zeitraum gelagert werden kann.Moreover, the drying of a printed value-added substrate can be accelerated by the addition of peroxide-containing substances, such as inorganic or organic peroxides. These decompose free radical oxygen and thus accelerate the oxidative drying of the ink layer. This also works in places where air or oxygen deficiency prevails, consequently also in non-impacting substrates and in high or large value document stacks. The disadvantage, however, is that peroxide-containing substances of color may be added relatively shortly before printing, because the color can not be stored for a longer period of time by the onset of the addition of the peroxide chemical reaction.

Die Trocknung eines bedruckten Wertdokumentsubstrats lässt sich darüber hinaus durch den Einsatz von UV-trocknenden Untergrundfarben oder hybriden UV-Systemen anstelle von oxidativ trocknenden Systemen beschleunigen. Solche Farben sind allerdings deutlich teurer, besitzen häufig sensibilisierende Eigenschaften und weisen unter Umständen eine schlechte Überdruckbarkeit auf. Zudem besitzen sie als Fertigfarbe nur eine begrenzte Haltbarkeit. Ähnliches gilt auch für neuartige hybride Farbformulierungen, die sowohl konventionelle, oxidativ trocknende Farbbestandteile, als auch UVhärtende Farbbestandteile enthalten.The drying of a printed value document substrate can also be accelerated by the use of UV-drying undercoats or hybrid UV systems instead of oxidative drying systems. However, such colors are much more expensive, often have sensitizing properties and may have poor overprintability. In addition, they have only a limited durability as finished paint. The same applies to novel hybrid color formulations which contain both conventional, oxidatively drying paint components and UV-curable paint components.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein im Hinblick auf die Trocknung bedruckter Wertdokumentsubstrate verbessertes Verfahren bereitzustellen.It is therefore an object of the present invention to provide a process improved with regard to the drying of printed value document substrates.

Das Verfahren sollte insbesondere einen oder mehrere der folgenden technischen Effekte bewirken:

  • die Anpassung der Schrumpfung des Druckbogens an die Bedürfnisse der nachfolgenden Druckschritte;
  • die Behebbarkeit von Problemen mit der Farbrezeptur (z.B. der Gehalt an Trockenstoffen), bevorzugt auch nach dem erfolgten Druck;
  • die Verkürzung der Trocknungszeit, um auf diese Weise eine kürzere Produktionszeit und eine Verkleinerung der Lagerfläche zu ermöglichen.
In particular, the method should produce one or more of the following technical effects:
  • the adaptation of the shrinkage of the signature to the needs of the subsequent printing steps;
  • the recoverability of problems with the color formulation (eg the content of dry substances), preferably also after the pressure has been applied;
  • the shortening of the drying time, in order to allow a shorter production time and a reduction of the storage area.

Diese Aufgabe wird durch die Merkmalskombinationen gemäß dem unabgängigen Anspruch gelöst. Die abhängigen Ansprüche stellen bevorzugte Ausführungsformen dar.This object is achieved by the feature combinations according to the independent claim. The dependent claims represent preferred embodiments.

Die WO 2009/013169 beschreibt das Trocknen von Druckfarben, bei denen eine oxidativ härtende Tinte eine Kombination aus schmelzfähigem Wachs und einer UV-häutenden Bindemittelkomponente umfasst.The WO 2009/013169 describes the drying of inks wherein an oxidatively curing ink comprises a combination of meltable wax and a UV-chelating binder component.

Zusammenfassung der ErfindungSummary of the invention

Ein erster Aspekt der Erfindung betrifft ein Verfahren zum Herstellen eines Wertdokuments, umfassend:

  1. a) das Bedrucken eines Wertdokumentsubstrats mit einer oxidativ trocknenden Druckfarbe, d.h. einer Druckfarbe, die nicht zu den UV-Farben oder UV-Lacken gehört;
  2. b) das Behandeln des bedruckten Wertdokumentsubstrats mit UV-Strahlung durch eine mit einem UV-Trocknungssystem ausgerüstete Druckmaschine; und
  3. c) das Trocknen des mit UV-Strahlung behandelten, bedruckten Wertdokumentsubstrats bei Raumtemperatur in einem Stapel.
A first aspect of the invention relates to a method for producing a value document, comprising:
  1. a) printing a value document substrate with an oxidatively drying printing ink, ie a printing ink that does not belong to the UV inks or UV varnishes;
  2. b) treating the printed value document substrate with UV radiation through a printing machine equipped with a UV drying system; and
  3. c) drying the UV-treated printed value document substrate at room temperature in a stack.

Es wird bevorzugt, dass im Schritt b) das Behandeln des Wertdokumentsubstrats mit UV-Strahlung und zusätzlich mit Ozon erfolgt. Die zusätzliche Behandlung mit Ozon erfolgt bevorzugt durch Beaufschlagen des Wertdokumentsubstrats mit Ozon in Raumluft mit einer Konzentration in einem Bereich von 1 bis 15 ppm.It is preferred that in step b) the treatment of the value document substrate with UV radiation and additionally with ozone takes place. The additional treatment with ozone is preferably carried out by applying the value document substrate with ozone in room air at a concentration in the range of 1 to 15 ppm.

Weiterhin wird bevorzugt, dass im Schritt b) das Behandeln mit UV-Strahlung durch eine mit einem UV-Trocknungssystem ausgerüstete (Simultan-)Druckmaschine erfolgt, wobei bevorzugt eine UV-Dosisleistung von 10 mJ/cm2 bis 200 mJ/cm2 pro Seite gewählt wird. Eine UV-Dosisleistung von 15 mJ/cm2 bis 80 mJ/cm2 pro Seite wird insbesondere bevorzugt. Die Messung der UV-Dosis kann mittels eines fotochromatischen Films, z.B. mittels eines 70 mm x 19 mm großen Messstreifens "tesa® UV Strip" der Firma Dr. Hönle AG erfolgen.Furthermore, it is preferred that in step b) the treatment with UV radiation is carried out by a (simultaneous) printing machine equipped with a UV drying system, preferably a UV dose rate of 10 mJ / cm 2 to 200 mJ / cm 2 per side is selected. A UV dose rate of 15 mJ / cm 2 to 80 mJ / cm 2 per side is particularly preferred. The measurement of the UV dose can be carried out by means of a photochromic film, for example by means of a 70 mm x 19 mm measuring strip "tesa® UV Strip" from Dr. Ing. Hönle AG.

Im Schritt c) erfolgt das Trocknen bevorzugt bei Raumtemperatur. Des Weiteren wird bevorzugt, das Trocknen der Wertdokumente in Form eines Wertdokument-Stapels durchzuführen, wobei der Wertdokument-Stapel insbesondere 200 bis 10 000 Druckbögen, bevorzugt 5000 bis 7000 Druckbögen, aufweist.In step c) drying is preferably carried out at room temperature. Furthermore, it is preferred to carry out the drying of the value documents in the form of a document of value document, wherein the document of value documents, in particular 200 to 10,000 sheets, preferably 5000 to 7000 sheets.

Ausführliche Beschreibung der ErfindungDetailed description of the invention

Die Erfindung wird nachfolgend anhand von bevorzugten Ausführungsformen beschrieben.The invention will be described below with reference to preferred embodiments.

Die erfindungsgemäße Verfahren ist bei allen üblichen Wertdokumentsubstraten anwendbar, insbesondere bei Papiersubstraten, Polymersubstraten und sogenannten Hybridsubstraten, worunter Folienverbundsubstrate zu verstehen sind, die entweder einen Kern auf der Basis von Papier und Außenschichten auf der Basis von Polymeren oder aber einen Kern aus einem Kunststoffmaterial und Außenschichten auf Papierbasis aufweisen. Es wird bevorzugt, Substrate auf Basis von Baumwollfasern zu verwenden.The inventive method is applicable to all conventional value document substrates, in particular paper substrates, polymer substrates and so-called hybrid substrates, which are to be understood composite film substrates, either a paper-based core and polymer-based outer layers or a core of a plastic material and outer layers on a paper basis. It is preferred to use substrates based on cotton fibers.

Das Substrat kann bestimmte Beschichtungen, Imprägnierungen oder auch Aufdrucke und/oder Sicherheitselemente bzw. Folienelemente aufweisen. Im Falle eines Polymersubstrats oder eines Verbundsubstrats mit einem Kern aus Papier und Außenschichten auf der Basis von Polymeren ist es zweckmäßig, auf das polymere Material eine oder mehrere Beschichtungen aufzubringen, die die Haftung des auf das jeweilige Substrat aufzubringenden Aufdrucks sicherstellen. Diese auf das polymere Material aufgebrachte Schicht wird üblicherweise als Farbannahmeschicht bezeichnet. Im Falle eines Papiersubstrats sind Farbannahmeschichten in der Regel entbehrlich, allerdings kann das Papiersubstrat ganz oder teilweise beschichtet werden, um es mit bestimmten Eigenschaften, z.B. lumineszierenden Eigenschaften aufgrund aufgebrachter Lumineszenzstoffe, auszustatten.The substrate may have certain coatings, impregnations or imprints and / or security elements or film elements. In the case of a polymer substrate or composite substrate having a core of paper and polymer-based outer layers, it is desirable Apply to the polymeric material one or more coatings that ensure the adhesion of the applied to the respective substrate printing. This layer applied to the polymeric material is commonly referred to as the ink accepting layer. In the case of a paper substrate, ink receiving layers are usually dispensable, but the paper substrate can be wholly or partially coated to provide it with certain properties, such as luminescent properties due to applied luminescent substances.

Oxidativ trocknende Druckfarben umfassen (oder bestehen aus nachfolgenden Komponenten): oxidativ trocknende Filmbildner, (Farb-)Pigmente, Füllstoffe, Lösungsmittel und Additive. Entsprechend DIN 55 945 ist der Filmbildner derjenige Bestandteil des Bindemittels, der für das Zustandekommen des Films wesentlich ist (siehe auch: Thomas Brock: "Lehrbuch der Lacktechnologie", 2. Auflage, Curt R. Vincentz Verlag, 2000, Seite 190 ). Filmbildner sind insbesondere makromolekulare organische Stoffe. Entsprechend dieser Norm versteht man unter dem Bindemittel den nichtflüchtigen Anteil eines Beschichtungsstoffes ohne Pigment und Füllstoff, aber einschließlich Weichmachern, Trockenstoffen und anderen nichtflüchtigen Hilfsstoffen. Unter dem Begriff nichtflüchtiger Anteil" ist hierin der nichtflüchtige Anteil gemäß ISO 4618 zu verstehen.Oxidatively drying inks include (or consist of the following components): oxidatively drying film formers, (color) pigments, fillers, solvents, and additives. According to DIN 55 945, the film former is that component of the binder which is essential for the formation of the film (see also: Thomas Brock: "textbook of paint technology", 2nd edition, Curt R. Vincentz Verlag, 2000, page 190 ). Film formers are especially macromolecular organic substances. According to this standard, the term "binder" refers to the non-volatile content of a coating material without pigment and filler, but including plasticizers, driers and other nonvolatile excipients. The term "nonvolatile fraction" is to be understood here as the non-volatile fraction according to ISO 4618.

Mit Bezug auf den für die oxidativ trocknende Druckfarbe verwendbaren oxidativ trocknenden Filmbildner werden Filmbildnermoleküle, die durch Einwirkung von Luftsauerstoff über Sauerstoffbrücken an aliphatische Doppelbindungen verknüpfbar sind, bevorzugt. Insbesondere werden oxidativ trocknende Alkydharze, Urethanalkyde, Epoxidharzester mit ungesättigten Fettsäuren, ölmodifizierte Phenolharze, sowie natürliche oder synthetische Triglyceride mit mindestens zum Teil ungesättigten Fettsäureresten als Filmbildner bevorzugt.With respect to the oxidatively drying film former which can be used for the oxidatively drying printing ink, film former molecules which can be linked to aliphatic double bonds by the action of atmospheric oxygen via oxygen bridges are preferred. In particular, oxidatively drying alkyd resins, Urethanalkyde, epoxy resin esters with unsaturated fatty acids, oil-modified phenolic resins, and natural or synthetic Triglycerides with at least partially unsaturated fatty acid residues as film formers preferred.

Die oxidativ trocknende Druckfarbe kann bevorzugt Trockenstoffe bzw. Sikkative, insbesondere organische Salze bestimmter Metalle wie Cobalt (z.B. Cobaltoctoat, Cobaltnaphthenat), Mangan, Calcium (z.B. Calciumoctoat), Zirkonium, Cer, Zink, Blei oder Eisen aufweisen. Zur Bildung der organischen Salze können organische Säuren, insbesondere höhere Fettsäuren wie Leinölfettsäure oder Tallölfettsäure, Harzsäuren, Naphthensäure oder 2-Ethylhexansäure verwendet werden. Bei oxidativ trocknenden Filmbildnern katalysieren die Trockenstoffe durch Redoxreaktionen die Sauerstoff-Übertragung aus der Luft und beschleunigen durch Polymerisation die Filmbildung.The oxidatively drying ink may preferably comprise driers or siccatives, especially organic salts of certain metals such as cobalt (e.g., cobalt octoate, cobalt naphthenate), manganese, calcium (e.g., calcium octoate), zirconium, cerium, zinc, lead, or iron. Organic acids, especially higher fatty acids such as linseed oil fatty acid or tall oil fatty acid, rosin acids, naphthenic acid or 2-ethylhexanoic acid can be used to form the organic salts. In the case of oxidatively drying film formers, the dry substances catalyze the oxygen transfer from the air by redox reactions and accelerate film formation by polymerization.

Die oxidativ trocknende Druckfarbe ist insbesondere eine Untergrunddruckfarbe.The oxidatively drying printing ink is in particular a background printing ink.

Der Schritt des Behandelns des bedruckten Wertdokumentsubstrats mit UV-Strahlung erfolgt zweckmäßigerweise durch Anwendung von UV-Trocknungssystemen, die insbesondere auf Quecksilber-UV-Mitteldruckstrahlern oder Eisen- oder Gallium-dotierten Quecksilber-UV-Mitteldruckstrahlern basieren können. Die Strahlerleistung pro Lampe liegt im Bereich von 120 W/cm bis 250 W/cm, bevorzugt bei 180 W/cm. Ein geeignetes Strahlersystem sind zum Beispiel die von der Firma IST METZ GmbH angebotenen Aggregate BLK-5 oder BLK-2.The step of treating the printed value document substrate with UV radiation is expediently carried out by using UV drying systems which can be based in particular on medium-pressure mercury UV lamps or iron or gallium-doped medium-pressure mercury UV lamps. The emitter power per lamp is in the range of 120 W / cm to 250 W / cm, preferably 180 W / cm. A suitable emitter system are, for example, the units BLK-5 or BLK-2 offered by the company IST METZ GmbH.

Im Falle einer mit einem UV-Trocknungssystem ausgerüsteten (Simultan-)Druckmaschine erfolgt das Verfahren zweckmäßigerweise bei einer Druckgeschwindigkeit von 8000 bis 12000 Bögen/h, insbesondere 10000 Bögen/h, und einer Einstellung einer Einzelstrahlerdosisleistung innerhalb eines Bereichs von 4 mJ/cm2 bis 100 mJ/cm2. Mit Bezug auf die Vermeidung der Schrumpfung des Druckbogens wird bevorzugt, die Strahlerleistung innerhalb eines Bereichs von 4 mJ/cm2 bis 60 mJ/cm2 einzustellen, wobei der Bereich von 10 mJ/cm2 bis 40 mJ/cm2 insbesondere bevorzugt wird.In the case of a (simultaneous) printing machine equipped with a UV drying system, the method expediently takes place at a printing speed of 8000 to 12000 sheets / h, in particular 10,000 sheets / h, and a setting of a single-jet dose rate within a range of 4 mJ / cm 2 to 100 mJ / cm 2 . With respect to the prevention of the shrinkage of the printing sheet, it is preferable to set the radiator power within a range of 4 mJ / cm 2 to 60 mJ / cm 2 , with the range of 10 mJ / cm 2 to 40 mJ / cm 2 being particularly preferred.

Der Schritt des Trocknens des mit UV-Strahlung behandelten, bedruckten Wertdokumentsubstrats erfolgt bei Raumtemperatur oder bei erhöhter Temperatur. Unter Raumtemperatur wird hierin eine Temperatur von 20°C verstanden. Die Trocknung bei erhöhter Temperatur kann insbesondere bei einer Temperatur in einem Bereich von 35°C bis 40°C erfolgen.The step of drying the UV-treated printed value-added substrate is at room temperature or elevated temperature. By room temperature is meant herein a temperature of 20 ° C. The drying at elevated temperature can be carried out in particular at a temperature in a range of 35 ° C to 40 ° C.

Um die Schrumpfung des Wertdokumentsubstrats zu vermeiden, wird bevorzugt, den Schritt des Trocknens der Wertdokumente in Form eines Wertdokument-Stapels durchzuführen. Der Wertdokument-Stapel kann insbesondere 200 bis 10 000 Druckbögen, bevorzugt 5000 bis 7000 Druckbögen, aufweisen. Ein Wertdokument-Stapel mit ca. 6000 Druckbögen wird für das Trocknen insbesondere bevorzugt. Des Weiteren wird bevorzugt, dass die Stapelkerntemperatur eine Temperatur von 40°C nicht überschreitet. Das Trocknen der Wertdokumente in Form eines Wertdokument-Stapels erfolgt bevorzugt bei Raumtemperatur.In order to avoid the shrinkage of the value document substrate, it is preferred to perform the step of drying the value documents in the form of a document of value document. The value document stack may in particular have 200 to 10,000 signatures, preferably 5000 to 7000 signatures. A value document stack with approximately 6000 signatures is particularly preferred for drying. Furthermore, it is preferred that the stack core temperature does not exceed a temperature of 40 ° C. The drying of the value documents in the form of a document of value document is preferably carried out at room temperature.

Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nachfolgend in Verbindung mit den Figuren erläutert.Further embodiments and advantages of the invention are explained below in conjunction with the figures.

Es zeigen:

  • Fig. 1 die Ergebnisse der Versuchsreihe gemäß Ausführungsbeispiel D, die auf Basis eines Rußschwarzpigments ohne Trockenstoff erhalten wurden;
  • Fig. 2 die Ergebnisse der Versuchsreihe gemäß Ausführungsbeispiel E, die auf Basis eines Rußschwarzpigments mit Trockenstoff erhalten wurden;
  • Fig. 3 die Ergebnisse der Versuchsreihe gemäß Ausführungsbeispiel F, die auf Basis eines organischen Buntpigments mit Trockenstoff erhalten wurden.
Show it:
  • Fig. 1 the results of the test series according to embodiment D, which were obtained on the basis of a carbon black pigment without dry matter;
  • Fig. 2 the results of the test series according to embodiment E, which were obtained on the basis of a carbon black pigment with dry matter;
  • Fig. 3 the results of the test series according to embodiment F, which were obtained on the basis of an organic colored pigment with dry matter.

In den Ausführungsbeispielen wurde eine für den Druck mit konventionell trocknenden Druckfarben geeignete Simultandruckmaschine mit nachgerüstetem UV-Trocknungssystem der Firma IST Metz ("BLK-5", zwei Strahler pro Seite mit einer Strahlerleistung von jeweils 180 W/cm) verwendet.In the embodiments, a suitable for printing with conventionally drying inks suitable simultaneous printing machine with retrofitted UV drying system of IST Metz ("BLK-5", two spotlights per side with a radiator output of 180 W / cm) was used.

Ausführungsbeispiel A:Embodiment A:

Baumwollvelinpapier wurde in einer Simultan-Bogendruckmaschine beidseitig mit jeweils einer Offset- und zwei Lettersetfarben bedruckt. Die Farben enthielten 3 Gew.-% Trockenstoff auf Cobalt-/Mangansalzbasis. Die Druckgeschwindigkeit betrug 8000 Bögen/h. Die Druckbögen wurden bei Raumtemperatur in Stapeln von jeweils 6000 Bögen getrocknet und konnten frühestens nach 48 Stunden im Stichtiefdruckverfahren weiterverarbeitet werden. Nach Zuschalten von zwei UV-Aggregaten (Firma IST Metz, Modell "BLK-5") je Seite bei 40 % der Maximalleistung und anschließender Trocknung bei Raumtemperatur in Stapeln von jeweils 6000 Bögen konnte eine Weiterverarbeitbarkeit im Stichtiefdruckverfahren bereits nach 20 Stunden erreicht werden.Cotton velor paper was printed on both sides in a simultaneous sheetfed press with one offset and two letter set inks. The paints contained 3% by weight cobalt / manganese salt drier. The printing speed was 8000 sheets / h. The signatures were dried at room temperature in stacks of 6000 sheets each and could be further processed by intaglio printing after 48 hours at the earliest. After connecting two UV aggregates (IST Metz, model "BLK-5") on each side at 40% of the maximum output and subsequent drying at room temperature in stacks of 6000 sheets each, further processability by intaglio printing could be achieved after only 20 hours.

Es konnte gezeigt werden, dass das Papiersubstrat durch die zur Reduzierung der Trocknungszeit auf weniger als 20 Stunden benötigten UV-Dosen nicht spürbar in seiner Dimension bzw. räumlichen Abmessung verändert wird, während ein höherer Wärmeeintrag durch Heißluft sehr wohl zu einem höherem Schrumpf des Substrats führt. Im Falle, dass ein erhöhter Schrumpf erwünscht ist, kann die Leistung der UV-Strahler erhöht werden.It has been shown that due to the UV doses required to reduce the drying time to less than 20 hours, the paper substrate is not appreciably changed in dimension or spatial dimension, whereas a higher heat input by hot air leads to a higher shrinkage of the substrate , In the event that increased shrinkage is desired, the power of the UV lamps can be increased.

Ausführungsbeispiel B:Embodiment B:

Baumwollvelinpapier wurde in einer Simultan-Bogendruckmaschine beidseitig mit jeweils drei Lettersetfarben bedruckt. Die Farben enthielten 3 Gew.-% Trockenstoff auf Cobalt-/Mangansalzbasis. Die Druckgeschwindigkeit betrug 10000 Bögen/h. Die Druckbögen wurden bei Raumtemperatur in Stapeln von jeweils 6000 Bögen bis zur Weiterverarbeitung getrocknet. Je fünf Bögen von der Stapeloberseite, der Stapelmitte und der Stapelunterseite wurden nach einer Stunde dem Stapel entnommen, vermessen und der Durchschnitt der Messwerte bestimmt.Cotton velor paper was printed on both sides in a simultaneous sheetfed press with three letter set colors each. The paints contained 3% by weight cobalt / manganese salt drier. The printing speed was 10,000 sheets / h. The signatures were dried at room temperature in batches of 6000 sheets each until further processing. Five sheets each from the stack top, the stack center and the bottom of the stack were taken from the stack after one hour, measured and the average of the measured values determined.

Bei einer Strahlungsleistung von 90 % der maximalen Leistung wurde eine durchschnittliche Schrumpfung des Substrats in einem Bereich von 1,5 mm bis 1,9 mm festgestellt. Eine Weiterverarbeitung nach 20 Stunden im Stichtiefdruck war problemlos möglich. Die durch den Stichtiefdruck verursachte Dimensionsvergrößerung des Substrats lag in der gleichen Größenordnung, so dass mit der beschriebenen Methode eine weitgehende Dimensionsneutralität erreicht werden konnte.At a radiant power of 90% of the maximum power, an average shrinkage of the substrate was found in a range of 1.5 mm to 1.9 mm. Further processing after 20 hours in intaglio printing was possible without problems. The dimensional enlargement of the substrate caused by intaglio printing was of the same order of magnitude, so that with the described method a substantial dimensional neutrality could be achieved.

Ausführungsbeispiel C:Embodiment C:

Baumwollvelinpapier mit in Teilbereichen applizierten Folienelementen wurde in einer Simultan-Bogendruckmaschine beidseitig mit jeweils einer Offset- und drei Lettersetfarben bedruckt. Die Farben enthielten 3 Gew.-% Trockenstoff auf Cobalt-/Mangansalzbasis. Die Druckgeschwindigkeit betrug 8000 Bögen/h. Besonders die Folienbereiche, die mit der Nassoffsetfarbe bedruckt wurden, waren bei der Anordnung der bedruckten Bögen im Stapel nicht ausreichend getrocknet, so dass starkes Ablegen im Stapel auf die jeweilige nächste Bogenrückseite zu beobachten war. Nach Zuschalten von zwei UV-Aggregaten (Firma IST Metz, Modell "BLK-5") je Seite bei 50 % der Maximalleistung trat das Problem des Ablegens nicht weiter auf. Folglich bewirkte die UV-Strahlung bereits innerhalb weniger Minuten eine deutliche Härtung der Farboberfläche.Cotton velvet paper with film elements applied in subregions was printed on both sides in each case with one offset and three letter set inks in a simultaneous sheetfed press. The paints contained 3% by weight cobalt / manganese salt drier. The printing speed was 8000 sheets / h. In particular, the film areas that were printed with the wet offset ink were not sufficiently dried in the arrangement of the printed sheets in the stack, so that strong deposition was observed in the stack on the respective next sheet back page. After connecting two UV aggregates (IST Metz, model "BLK-5") per side at 50% of the maximum power, the problem of dropping did not occur. Consequently, the UV radiation already within a few minutes caused a significant hardening of the paint surface.

Die weiteren Ausführungsbeispiele D, E und F wurden an Labordruckaggregaten durchgeführt. Die prinzipielle Vorgehensweise war wie folgt:

  • An einem Probedruckgeräte der Firma IGT Metz wurde ein Probedruck mit einer Auftragsmenge der Druckfarbe von 1 g/m2 auf Baumwollvelinpapier durchgeführt. Nach einer Trocknung unter den angegebenen Bedingungen wurde die bedruckte Seite auf ein unbedrucktes Stück Papier gleicher Größe gelegt und dieser Zusammenschluss gemeinsam verpresst. Die Menge der auf das zuvor unbedruckte Papier übertragenen Farbe wurde als Maß der Trocknung verwendet. Diese Methode spiegelt die realen Produktionsbedingungen gut wieder, weil auch hier die bedruckten Bögen im nächsten Verarbeitungsschritt einer ähnlichen Belastung standhalten müssen.
The further embodiments D, E and F were carried out on laboratory pressure units. The basic procedure was as follows:
  • On a sample printing equipment from IGT Metz, a trial print with an application quantity of the printing ink of 1 g / m 2 was carried out on cotton velvet paper. After drying under the conditions indicated, the printed side was placed on an unprinted piece of paper of the same size and this combination was pressed together. The amount of ink transferred to the previously unprinted paper was used as a measure of drying. This method reflects the real production conditions well, because here too the printed sheets in the next processing step have to withstand a similar load.

Bereitstellung der Referenzproben:Provision of reference samples:

Die Druckstreifen wurden offen an der Raumluft bei einer Temperatur von 20 °C für vier Stunden getrocknet.The print strips were dried open in the room air at a temperature of 20 ° C for four hours.

Durchführung der Trocknung mittels UV-Strahlung:Carrying out the drying by means of UV radiation:

Die Druckstreifen wurden unmittelbar nach dem Druck in einem Durchlauf-UV-Bandtrockner mit der angegebenen UV-Dosisleistung bestrahlt. Als UV-Strahler kamen sowohl normale Quecksilber-UV-Mitteldruckstrahler (Firma IST, Spektrentyp CK) als auch eisendotierte Quecksilber-UV-Mitteldruckstrahler (Firma IST, Spektrentyp CK-II) zum Einsatz. Die Druckstreifen wurden zudem auf einem Metallträger zur schnellen Wärmeableitung fixiert. Die Temperatur der Druckstreifen erreichte bereits nach 5 bis 10 Sekunden nach dem Trockner-Durchlauf wieder Raumtemperatur. Die Streifen wurden dann vier Stunden lang neben den Referenzstreifen getrocknet.The print strips were irradiated immediately after printing in a continuous UV belt dryer at the indicated UV dose rate. The UV lamps used were both normal mercury UV medium-pressure lamps (company IST, spectra type CK) and iron-doped mercury UV medium-pressure lamps (company IST, spectrum type CK-II). The print strips were also fixed on a metal support for rapid heat dissipation. The temperature of the printing strips reached room temperature again after only 5 to 10 seconds after the dryer had been run through. The strips were then dried next to the reference strips for four hours.

Durchführung der Trocknung mittels Wärme:Carrying out the drying by means of heat:

Die Druckstreifen wurden unmittelbar nach dem Druck in einem Trockenschrank umluftfrei bei 35 °C für ein, zwei oder drei Stunden getrocknet. Nach der jeweiligen Zeit wurden die Streifen aus dem Trockenschrank genommen und für die verbleibende Zeit bis zur Gesamttrocknungszeit von vier Stunden neben den Referenzsteifen bei Raumtemperatur weitergetrocknet.The printing strips were dried in a drying oven at 35 ° C. for one, two or three hours immediately after printing. After each time, the strips were removed from the oven and further dried at room temperature for the remaining time to the total drying time of four hours, in addition to the reference stiffeners.

Durchführung der Trocknung mittels Ozon:Execution of drying by ozone:

Die Druckstreifen wurden unmittelbar nach dem Druck in einer Kammer mit einer Mischung aus atmosphärischer Luft und Ozon unter den angegebenen Bedingungen bei Raumdruck begast. Nach Ablauf der angegebenen Zeit wurden die Streifen aus der Kammer genommen und für die verbleibende Zeit bis zur Gesamttrocknungszeit von vier Stunden neben den Referenzsteifen bei Raumtemperatur weitergetrocknet. Der angeschlossene Ozongenerator wurde mit getrockneter Raumluft betrieben und arbeitete mit einer Koronaentladung.The printing strips were fumigated immediately after printing in a chamber with a mixture of atmospheric air and ozone under the conditions indicated at room pressure. At the end of the indicated time, the strips were removed from the chamber and further dried at room temperature for the remaining time to the total drying time of four hours, in addition to the reference stiffeners. The connected ozone generator was operated with dried room air and worked with a corona discharge.

Ausführungsbeispiel D (Versuchsreihe):Exemplary embodiment D (test series):

Eine schwarze Lettersetfarbe auf Basis eines Rußschwarzpigments ohne Trockenstoff wurde mit einer Auftragsmenge von 1 g/m2 auf Baumwollvelinsubstrat aufgebracht und auf verschiedene Arten getrocknet:

Referenz:
vierstündige Trocknung bei Raumtemperatur.
UV 1:
Bestrahlung mit einer UV-Dosisleistung von 70 mJ/cm2, mit anschließender vierstündiger Trocknung bei Raumtemperatur.
UV 2:
Bestrahlung mit der doppelten UV-Dosisleistung von UV 1, mit anschließender vierstündiger Trocknung bei Raumtemperatur.
UV 3:
Bestrahlung mit der dreifachen UV-Dosisleistung von UV 1, mit anschließender vierstündiger Trocknung bei Raumtemperatur.
Wärme 1:
einstündige Trocknung bei 35 °C mit anschließender dreistündiger Weitertrocknung bei Raumtemperatur.
Wärme 2:
zweistündige Trocknung bei 35 °C mit anschließender zweistündiger Weitertrocknung bei Raumtemperatur.
Wärme 3:
zweistündige Trocknung bei 35 °C mit anschließender einstündiger Weitertrocknung bei Raumtemperatur.
A black letter set paint based on a carbon black pigment without dry matter was applied to cotton veline substrate at an application rate of 1 g / m 2 and dried in various ways:
Reference:
four hours drying at room temperature.
UV 1:
Irradiation with a UV dose rate of 70 mJ / cm 2 , followed by four hours of drying at room temperature.
UV 2:
Irradiation with double UV dose rate of UV 1, followed by four hours of drying at room temperature.
UV 3:
Irradiation with three times the UV dose rate of UV 1, followed by four hours of drying at room temperature.
Heat 1:
one hour drying at 35 ° C followed by further drying at room temperature for 3 hours.
Heat 2:
drying for two hours at 35 ° C followed by further drying at room temperature for two hours.
Heat 3:
drying for two hours at 35 ° C followed by drying for one more hour at room temperature.

Figur 1 zeigt die durch die Verpressung auf das unbedruckte Substrat übertragene Farbmenge. Je größer diese ist, desto schlechter war die Farbe zum Zeitpunk des Abklatschs getrocknet. FIG. 1 shows the transferred by the compression of the unprinted substrate amount of ink. The larger this is, the worse the color was dried at the time of the Abklatschs.

Üblicherweise muss eine Farbe ohne Trockenstoff bei Raumtemperatur mindestes eine Woche oder länger trocknen, bis die Druckbögen weiterverarbeitet werden können. Es ist also keine industrielle Produktion möglich. Auch die Trocknung im Wärmeschrank erfordert eine verhältnismäßig lange Trocknungsdauer und verändert zudem die Abmessung des Papiersubstrats. So zeigt sich auch im Ausführungsbeispiel D, dass ein dreistündiger Wärmeeintrag keinen signifikanten Effekt gegenüber der Referenz erzielen kann. Die UV-Strahlung hingegen erzielt bereits eine messbare Wirkung.Usually, a dry-free paint at room temperature has to dry for at least a week or more until the signatures can be further processed. So there is no industrial production possible. The drying in the oven also requires a relatively long drying time and also changes the dimension of the paper substrate. Thus, in the exemplary embodiment D as well, a three-hour heat input can not achieve a significant effect compared to the reference. By contrast, UV radiation already achieves a measurable effect.

Ausführungsbeispiel E (Versuchsreihe):Exemplary embodiment E (test series):

Eine schwarze Lettersetfarbe auf Basis eines Rußschwarzpigments mit 3 Gew.-% eines Trockenstoffs auf Cobaltsalzbasis wurde mit einer Auftragsmenge von 1 g/m2 auf ein Baumwollvelinsubstrat aufgebracht und auf verschiedene Arten getrocknet:

Referenz:
vierstündige Trocknung bei Raumtemperatur.
UV 1:
Bestrahlung mit einer UV-Dosisleistung von 70 mJ/cm2 mit anschließender vierstündiger Trocknung bei Raumtemperatur.
UV 2:
Bestrahlung mit der doppelten UV-Dosisleistung von UV 1 mit anschließender vierstündiger Trocknung bei Raumtemperatur.
UV 3:
Bestrahlung mit der dreifachen UV-Dosisleistung von UV 1 mit anschließender vierstündiger Trocknung bei Raumtemperatur.
Wärme 1:
einstündige Trocknung bei 35 °C mit anschließender dreistündiger Weitertrocknung bei Raumtemperatur.
Wärme 2:
zweistündige Trocknung bei 35 °C mit anschließender zweistündiger Weitertrocknung bei Raumtemperatur.
Wärme 3:
zweistündige Trocknung bei 35 °C mit anschließender einstündiger Weitertrocknung bei Raumtemperatur.
A black paint composition based on a carbon black pigment containing 3% by weight of a cobalt salt-based dry substance was applied to a cotton wool substrate at an application rate of 1 g / m 2 and dried in various ways:
Reference:
four hours drying at room temperature.
UV 1:
Irradiation with a UV dose rate of 70 mJ / cm 2 followed by four hours of drying at room temperature.
UV 2:
Irradiation with the double UV dose rate of UV 1 followed by four hours of drying at room temperature.
UV 3:
Irradiation with three times the UV dose rate of UV 1 followed by four hours of drying at room temperature.
Heat 1:
one hour drying at 35 ° C followed by further drying at room temperature for 3 hours.
Heat 2:
drying for two hours at 35 ° C followed by further drying at room temperature for two hours.
Heat 3:
drying for two hours at 35 ° C followed by drying for one more hour at room temperature.

Figur 2 zeigt die durch die Verpressung auf das unbedruckte Substrat übertragene Farbmenge. Je größer diese ist, desto schlechter war die Farbe getrocknet. FIG. 2 shows the transferred by the compression of the unprinted substrate amount of ink. The larger this is, the worse the paint was dried.

Es zeigt sich also deutlich, dass die UV-Strahlung gegenüber der Referenz Effekte in einer Größenordnung erzielen kann, wie sie sonst nur durch Wärme hervorgerufen werden können.It is thus clear that the UV radiation compared to the reference can achieve effects in the order of magnitude that otherwise can only be caused by heat.

Ausführungsbeispiel F (Versuchsreihe):Exemplary embodiment F (test series):

Eine rote Lettersetfarbe auf Basis eines organischen Buntpigments wurde mit einer Auftragsmenge von 1 g/m2 auf ein Baumwollvelinsubstrat aufgebracht und auf verschiedene Arten getrocknet. Die Farbe enthielt 3 Gew.-% Trockenstoff:

Referenz:
vierstündige Trocknung bei Raumtemperatur.
UV 1:
Bestrahlung mit einer UV-Dosisleistung von 70 mJ/cm2 mit anschließender vierstündiger Trocknung bei Raumtemperatur.
UV 2:
Bestrahlung mit der doppelten UV-Dosisleistung von UV 1 mit anschließender vierstündiger Trocknung bei Raumtemperatur.
UV 3:
Bestrahlung mit der dreifachen UV-Dosisleistung von UV 1 mit anschließender vierstündiger Trocknung bei Raumtemperatur.
Wärme 1:
einstündige Trocknung bei 40 °C mit anschließender dreistündiger Weitertrocknung bei Raumtemperatur.
Wärme 2:
zweistündige Trocknung bei 40 °C mit anschließender zweistündiger Weitertrocknung bei Raumtemperatur.
Wärme 3:
zweistündige Trocknung bei 40 °C mit anschließender einstündiger Weitertrocknung bei Raumtemperatur.
Ozon 1:
einminütige Beaufschlagung mit Ozon in Raumluft mit einer Konzentration von ca. 10 ppm mit anschließender vierstündiger Weitertrocknung bei Raumtemperatur.
A red letter set paint based on an organic colored pigment was applied to a cotton wool substrate at an application rate of 1 g / m 2 and dried in various manners. The paint contained 3% by weight of dry matter:
Reference:
four hours drying at room temperature.
UV 1:
Irradiation with a UV dose rate of 70 mJ / cm 2 followed by four hours of drying at room temperature.
UV 2:
Irradiation with the double UV dose rate of UV 1 followed by four hours of drying at room temperature.
UV 3:
Irradiation with three times the UV dose rate of UV 1 followed by four hours of drying at room temperature.
Heat 1:
Drying for one hour at 40 ° C followed by further drying at room temperature for 3 hours.
Heat 2:
drying for two hours at 40 ° C followed by further drying at room temperature for two hours.
Heat 3:
drying for two hours at 40 ° C followed by drying for one more hour at room temperature.
Ozone 1:
One-minute exposure to ozone in room air with a concentration of approx. 10 ppm followed by further drying at room temperature for four hours.

Figur 3 zeigt die durch die Verpressung auf das unbedruckte Substrat übertragene Farbmenge. Je größer diese ist, desto schlechter war die Farbe getrocknet. FIG. 3 shows the transferred by the compression of the unprinted substrate amount of ink. The larger this is, the worse the paint was dried.

Es zeigt sich also deutlich, dass die UV-Strahlung gegenüber der Referenz Effekte in einer Größenordnung erzielen kann, wie sie sonst nur durch Wärme hervorgerufen werden können. Auch Ozon zeigt eine vorteilhafte Wirkung.It is thus clear that the UV radiation compared to the reference can achieve effects in the order of magnitude that otherwise can only be caused by heat. Ozone also shows a beneficial effect.

In Kombinationsversuchen konnte gezeigt werden, dass Ozon die Wirkung der UV-Strahlung noch weiter verstärkt.Combination experiments have shown that ozone enhances the effect of UV radiation even further.

Die Wirkung einer UV-Behandlung von unter einer Sekunde Dauer mit anschließender vierstündiger Weitertrocknung bei Raumtemperatur hat z.B. bei einer getesteten Farbe, die ein normales Sikkativ enthält, eine ähnlich hohe Wirkung wie die vierstündige Trocknung bei einer Temperatur von 35 °C gezeigt. Besonders interessant ist die zusätzliche Beobachtung, dass die UV-Bestrahlung bei Farben ohne Sikkativ ebenfalls eine Wirkung zeigt, während die Beaufschlagung mit Wärme innerhalb das beobachteten Zeitraums keine nennenswerte Trocknung bewirkt hat.The effect of UV treatment of less than one second, followed by further drying at room temperature for four hours, has e.g. for a tested paint containing a normal siccative, the effect is similar to the four hour drying at a temperature of 35 ° C. Particularly interesting is the additional observation that the UV irradiation also shows an effect on colors without siccatives, while the application of heat within the observed period has caused no appreciable drying.

Claims (4)

  1. A method for manufacturing a value document, comprising:
    a) printing a value document substrate with an oxidatively drying printing ink, i.e. a printing ink which does not belong to the UV inks or UV lacquers;
    b) treating the printed value document substrate with UV radiation by a printing machine equipped with a UV drying system; and
    c) drying the printed value document substrate, which was treated with UV radiation, at room temperature in a stack.
  2. The method according to claim 1, wherein in step b) the treating of the value document substrate is effected with UV radiation and additionally with ozone.
  3. The method according to any of claims 1 or 2, wherein in step b) the treating with UV radiation is effected by a (simultaneous) printing machine equipped with a UV drying system, in which at a print speed of 10000 sheets/h a UV dose rate of 10 mJ/cm2 to 40 mJ/cm2 per radiator is chosen.
  4. The method according to any of claims 1 to 3, wherein the drying of the value documents is carried out in the form of a value document stack and the value document stack has 1000 to 10 000 print sheets, preferably 5000 to 7000 print sheets.
EP13722684.1A 2012-05-29 2013-05-14 Method for producing a value document Not-in-force EP2888112B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012010534A DE102012010534A1 (en) 2012-05-29 2012-05-29 Method for producing a value document
PCT/EP2013/001421 WO2013178325A2 (en) 2012-05-29 2013-05-14 Method for producing a value document

Publications (2)

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EP2888112A2 EP2888112A2 (en) 2015-07-01
EP2888112B1 true EP2888112B1 (en) 2016-07-13

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CN (1) CN104321199B (en)
BR (1) BR112014029183A2 (en)
CA (1) CA2870463C (en)
DE (1) DE102012010534A1 (en)
HK (1) HK1201234A1 (en)
MX (1) MX359340B (en)
WO (1) WO2013178325A2 (en)
ZA (1) ZA201408152B (en)

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ES2735949T3 (en) * 2015-04-28 2019-12-20 Sicpa Holding Sa Wet offset printing process
DE102017213226A1 (en) * 2016-09-27 2018-03-29 Heidelberger Druckmaschinen Ag Method for producing a printed product
WO2021197663A1 (en) 2020-04-03 2021-10-07 Giesecke+Devrient Currency Technology Gmbh Valuable document substrate and method for disinfection

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CH674989A5 (en) * 1988-09-05 1990-08-15 Sicpa Holding Sa
JPH0369394A (en) * 1989-08-09 1991-03-25 Hitachi Maxell Ltd Drying method for oxidative polymerization type ink and production of print information recording medium
JPH03281249A (en) * 1990-03-29 1991-12-11 Dainippon Printing Co Ltd Prevention of offset in offset printing
DE10243653A1 (en) 2002-09-19 2004-04-01 Giesecke & Devrient Gmbh security paper
UA99468C2 (en) * 2007-07-20 2012-08-27 Сікпа Холдінг Са Intaglio printing ink, process for the preparation and use thereof, intaglio process with use of ink and security document
DE102008058397A1 (en) * 2008-11-21 2010-05-27 Giesecke & Devrient Gmbh Value document with matt and glossy surface areas and method for its production
AR090178A1 (en) * 2012-03-23 2014-10-22 Sicpa Holding Sa PRINTING METHOD WITH OXIDATION DRY CALCOGRAPHIC INK AND UV-VIS CURABLE CALCOGRAPHIC INKS

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DE102012010534A1 (en) 2013-12-05
WO2013178325A3 (en) 2014-04-24
BR112014029183A2 (en) 2017-06-27
MX2014014369A (en) 2015-02-05
CN104321199B (en) 2016-11-23
ZA201408152B (en) 2015-11-25
MX359340B (en) 2018-09-26
HK1201234A1 (en) 2015-08-28
CN104321199A (en) 2015-01-28
EP2888112A2 (en) 2015-07-01
CA2870463A1 (en) 2013-12-05
CA2870463C (en) 2017-04-18
WO2013178325A2 (en) 2013-12-05

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