WO2012146263A1 - Impression offset à déshumidification - Google Patents

Impression offset à déshumidification Download PDF

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Publication number
WO2012146263A1
WO2012146263A1 PCT/EP2011/002134 EP2011002134W WO2012146263A1 WO 2012146263 A1 WO2012146263 A1 WO 2012146263A1 EP 2011002134 W EP2011002134 W EP 2011002134W WO 2012146263 A1 WO2012146263 A1 WO 2012146263A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
printing
moisture
blanket cylinder
blanket
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.)
Ceased
Application number
PCT/EP2011/002134
Other languages
German (de)
English (en)
Inventor
Peter Kaufmann
Werner Hofer
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+Devrient GmbH
Original Assignee
Giesecke+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+Devrient GmbH filed Critical Giesecke+Devrient GmbH
Priority to PCT/EP2011/002134 priority Critical patent/WO2012146263A1/fr
Publication of WO2012146263A1 publication Critical patent/WO2012146263A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F22/00—Means preventing smudging of machine parts or printed articles

Definitions

  • the invention relates to a device and a method for removing moisture from an offset printing machine, which consists of at least one blanket cylinder, at least one printing cylinder with at least one substrate and at least one printing unit consisting of at least one printing form cylinder, at least one inking unit and at least one dampening unit.
  • the printing plate on the printing form cylinder is first moistened with the dampening unit and then inked with the inking unit.
  • the ink and dampening solution are transferred from the printing plate to the blanket cylinder and from there to the substrate.
  • the printing inks absorb up to a certain amount of dampening solution and form a so-called “emulsion” or a color-water dispersion, the dampening solution being present in the form of droplets embedded in the printing ink, but also partially exposed on the paint layer.
  • dampening solution is printed, one part emulsifies into the paint, and one part evaporates.
  • the "misprinted" quantity of ink and the amount of dampening solution consumed must, with a balanced balance of quantities, because supplied quantities correspond. If the droplet size of the dampening solution falls below a certain value, the offset printing process collapses immediately, ie there is no longer a uniform print-form-dependent ink transfer. If, on the other hand, too much dampening solution is introduced into the paint, the behavior of the paint-water dispersion becomes unreliable. In particular, in the case of UV-curing printing inks, it can lead to strong density and Tonwertschwankache.
  • EP 2 047991 A2 discloses a thermo-air drying device for a printing machine for discharging moisture from the printing substrate, comprising an inflator for directing a dry air stream onto a printing substrate, a conveying device for conveying the dry air stream through the inflator, a heating device for heating the dry air stream, a control device for adjusting the temperature of the drying air flow, and a cooling device for cooling the printing material in the region of a back side facing away from the inflator Betigstoffschseite.
  • the invention is therefore the object of developing a generic device and a generic method such that the disadvantages of the prior art are eliminated.
  • At least one dehumidifying device removes excess moisture from the at least one blanket cylinder and / or the at least one printing form cylinder.
  • Excess moisture in the context of this invention is moisture which makes the behavior of the color-water dispersion unreliable, so that an uneven and unpredictable printed image is formed on the substrate and, in particular, no sufficient separation of printing and non-printing elements on the printing plate cylinder or blanket cylinder takes place.
  • the amount of remaining moisture is dependent on the printing conditions, ie, for example, type of substrate, ink system, printing plates, printing machines.
  • the dehumidifying device is at least one air flow or a fan, the so-called air knife, the heated and / or dry air passes to the at least one blanket cylinder and / or the at least one printing plate cylinder.
  • an exhaust system sucks the cooled and / or moisture-enriched air from the at least one blanket cylinder and / or the at least one printing form cylinder.
  • the temperatures, temperature differences and relative or absolute humidities used are dependent on the pressure conditions, i. For example, type of substrate, color system, printing plates, printing machines. Basically, the temperature of the supplied air should be slightly higher than the temperature inside the press and the relative or absolute humidity should be slightly lower.
  • the moisture is thus removed from the blanket cylinder or from the plate cylinder without mechanical contact with other components and thus indirectly. In this way, it is advantageously achieved that no additional wear or abrasion occurs on the blanket cylinder or the printing form cylinder.
  • the dehumidifying device consists of at least one cylinder which contacts the surface of the at least one blanket cylinder and / or the at least one pressure cylinder and which has a surface which the excess moisture of the at least one blanket cylinder and / or the at least one At least partially accommodates the printing form cylinder.
  • the dehumidifying device consists of at least one flexible band, which contacts the surface of the at least one blanket cylinder and / or the at least one printing forme cylinder and which has a surface which the excess moisture of the at least one blanket cylinder and / or the at least a printing form cylinder accommodates.
  • the flexible band is preferably designed as an endless belt and guided by at least two cylinders.
  • At least the surface of the cylinder or the flexible belt which contacts the blanket cylinder or the printing form cylinder is made of a moisture-absorbing or hydrophilic material.
  • a moisture-absorbing or hydrophilic material is, for example, an open-pore elastomer, in particular polyurethane. The moisture penetrates into the open pores as a result of capillary forces and is thereby removed from the blanket cylinder and / or the printing plate cylinder.
  • the printing material is preferably made of a material having a surface that absorbs little or no moisture.
  • a material is, for example, a film or plastic film of polyvinyl chloride, polycarbonate, polyethylene terephthalate or ABS (acrylonitrile-butadiene-styrene copolymer) or a film composite of at least two of the films mentioned or plastic films.
  • a material is a composite of at least one paper layer which is covered on its two surfaces by at least one film or plastic film and / or at least one lacquer layer.
  • the paper layer here preferably consists of paper made of cotton fibers or other natural fibers or synthetic fibers, ie a mixture of natural and synthetic fibers.
  • the invention can of course also be applied to materials whose surface absorbs moisture, for example paper.
  • materials whose surface absorbs moisture for example paper.
  • so much moisture is applied to the substrate that while the substrate can absorb some of the excess moisture, it is unable to absorb all of the excess moisture.
  • the removal of moisture according to the invention makes it possible to remove this portion of the excess moisture even before application to the paper so that little or no excess moisture is transferred to the printing material.
  • 1 is an offset printing machine with an indirect discharge of the excess moisture of the blanket cylinder with an air knife before the blanket cylinder has come into contact with the plate cylinder,
  • FIG. 2 alternative mounting locations of the air knife of FIG. 1 and in this case
  • Blanket cylinder has come into contact with the plate cylinder
  • Printing plate cylinder has come into contact with the blanket cylinder
  • Fig. 3 is an offset printing machine with a discharge of the excess
  • Fig. 4 is an offset printing machine with a discharge of the excess
  • FIG 6 shows an air flow plan for the removal of the excess moisture with supply line and discharge of air.
  • Fig. 1 shows schematically an offset printing machine (1) from a blanket cylinder (3), a printing cylinder (4) with a substrate (5) and a printing unit.
  • the printing unit here consists of a printing form cylinder (2), an inking unit (6) and a dampening unit (7).
  • the removal of the excess moisture of the blanket cylinder takes place in this embodiment indirectly with an air knife before the blanket cylinder (3) has come into contact with the printing form cylinder (2).
  • an air flow (8) with controllable temperature, relative humidity, flow rate and speed is guided obliquely in the direction of rotation on the blanket cylinder (3) via a nozzle from a fan.
  • the air flow (8) absorbs moisture from the blanket cylinder (3).
  • the cooled and moisture-enriched air (9) by an extraction which is located slightly further in the direction of rotation of the blanket cylinder (3), discharged again.
  • This mounting location has the advantage that the printed image on the blanket cylinder (3) is not or only slightly negatively affected. This means in particular that the printed image is not smeared.
  • the apparatus for removing moisture prior to the passage of the printing material (5) through rubber cylinder (3) and printing cylinder (4) is particularly preferably applied.
  • This mounting location has the advantage that the moisture of the ink is reduced to the substrate before the application of the ink, so that the moisture content of the ink does not change further until it is applied to the printing substrate. If this
  • FIG. 2 b and FIG. 2 c it is also possible to have the device for removing moisture according to FIG. 2 b and FIG. 2 c acting on the printing form cylinder (2), so that the moisture of the printing form cylinder (2) is removed. Also in this case, it is possible either to let the air doctor blade act on the printing form cylinder before the printing form cylinder has come into contact with the blanket cylinder ( Figure 2b) or after the printing form cylinder has come into contact with the blanket cylinder ( Figure 2c).
  • Fig. 3 shows a further embodiment in which instead of the air knife of Fig. 1, a flexible band (11) at least partially receives the excess moisture of the blanket cylinder (3).
  • the flexible band (11) is designed as an endless belt and is guided by the two cylinders (10) and (12) in an "orbit", wherein the axis of rotation of the cylinder (10), which brings the flexible band (11) with the blanket cylinder (3) into contact, is aligned substantially parallel to the axis of rotation of the blanket cylinder (3).
  • Fig. 4 shows a further embodiment in which instead of a flexible belt (11) of FIG. 3, a rotating cylinder (13) at least partially absorbs the excess moisture of the blanket cylinder (3), whereby also the axis of rotation of the cylinder (13) in Aligned substantially parallel to the axis of rotation of the blanket cylinder (3).
  • the cylinder (13) has the same dimensions as the blanket cylinder (3).
  • Fig. 5 shows an alternative mounting location for the flexible band (11) or the cylinder (13).
  • the flexible band (11) or the cylinder (13) acts on the printing form cylinder after the printing form cylinder has come into contact with the blanket cylinder.
  • Fig. 6 shows schematically an air flow plan for the dampening solution removal with supply and discharge of air, as he can get used in the embodiments of FIG. 1 or FIG.
  • the devices for removing moisture from the respective printing units (1) with leads (8) and suction (9) of the printing units (1) via hoses to a separate air conditioning unit (15) are connected, so that they form a closed circuit.
  • the air stream is dried in the air conditioning unit (15) before reuse with a condenser (16), tempered with a tempering device (1) and regulated with a fan or blower (18) with respect to flow rate and flow rate.
  • the parameters drying, temperature, volume Current and flow rate of the air flow can be controlled separately.
  • Boom (19) and feeder (20) are shown here only for the sake of completeness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)

Abstract

L'invention concerne un dispositif d'évacuation de l'humidité d'une machine à imprimer offset (1), constituée d'au moins un cylindre de blanchet (3), d'au moins un cylindre d'impression (4) présentant au moins un support d'impression (5) et au moins un groupe d'impression constitué d'au moins un cylindre porte-forme (2), la machine à imprimer étant également constituée d'au moins un mécanisme d'encrage (6) et d'au moins un dispositif de mouillage (7). Selon l'invention, au moins un dispositif de déshumidification évacue l'humidité en excès du ou des cylindres de blanchet (3) et/ou du ou des cylindres porte-forme (4).
PCT/EP2011/002134 2011-04-28 2011-04-28 Impression offset à déshumidification Ceased WO2012146263A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/002134 WO2012146263A1 (fr) 2011-04-28 2011-04-28 Impression offset à déshumidification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/002134 WO2012146263A1 (fr) 2011-04-28 2011-04-28 Impression offset à déshumidification

Publications (1)

Publication Number Publication Date
WO2012146263A1 true WO2012146263A1 (fr) 2012-11-01

Family

ID=44626194

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/002134 Ceased WO2012146263A1 (fr) 2011-04-28 2011-04-28 Impression offset à déshumidification

Country Status (1)

Country Link
WO (1) WO2012146263A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017004234A1 (de) * 2017-05-02 2018-11-08 Giesecke+Devrient Currency Technology Gmbh Befeuchtungsverfahren und Befeuchtungsvorrichtung zur Wiederbefeuchtung nach Applikationselementapplikation und Wertdokumentsubstrat

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2036719A1 (fr) * 2007-08-23 2009-03-18 Rr Donnelley Appareil et procédé pour contrôler l'application d'une substance sur un substrat
EP2047991A2 (fr) 2007-10-11 2009-04-15 manroland AG Dispositif de séchage à air thermique et procédé destiné à sécher une matière d'impression
DE102008014953A1 (de) * 2008-03-19 2009-09-24 Manroland Ag Druckwerk für eine Rotationsdruckmaschine und Verfahren zum Betreiben dessen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2036719A1 (fr) * 2007-08-23 2009-03-18 Rr Donnelley Appareil et procédé pour contrôler l'application d'une substance sur un substrat
EP2047991A2 (fr) 2007-10-11 2009-04-15 manroland AG Dispositif de séchage à air thermique et procédé destiné à sécher une matière d'impression
DE102008014953A1 (de) * 2008-03-19 2009-09-24 Manroland Ag Druckwerk für eine Rotationsdruckmaschine und Verfahren zum Betreiben dessen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HELMUT KIPPHAN: "Handbuch der Printmedien", 2000, SPRINGER, pages: 215

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017004234A1 (de) * 2017-05-02 2018-11-08 Giesecke+Devrient Currency Technology Gmbh Befeuchtungsverfahren und Befeuchtungsvorrichtung zur Wiederbefeuchtung nach Applikationselementapplikation und Wertdokumentsubstrat

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