EP3750710B1 - Rotationstiefdruckeinheit - Google Patents

Rotationstiefdruckeinheit Download PDF

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Publication number
EP3750710B1
EP3750710B1 EP20175984.2A EP20175984A EP3750710B1 EP 3750710 B1 EP3750710 B1 EP 3750710B1 EP 20175984 A EP20175984 A EP 20175984A EP 3750710 B1 EP3750710 B1 EP 3750710B1
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EP
European Patent Office
Prior art keywords
pressure roller
electrostatic
printing
bar
lateral surface
Prior art date
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Active
Application number
EP20175984.2A
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English (en)
French (fr)
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EP3750710A1 (de
Inventor
Daniele BARBUI
Maurizio BARBUI
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.)
ACE Srl
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Ace Di Barbui Davide & Figli Srl
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/18—Impression cylinders
    • B41F13/187—Impression cylinders for rotogravure

Definitions

  • the present invention relates to a printing unit for rotogravure printing comprising a pressure roller adapted to be pressed against a printing roller, with the interposition therebetween of a sheet material to be printed, for example wound in a roll. Both the pressure roller and the printing roller are configured to rotate about the axis thereof, feeding the sheet or roll material therebetween during printing.
  • the pressure roller is coated with a coating layer, or sleeve, made of elastomeric material which is electrostatically charged by an electrostatic printing aid apparatus.
  • Rotogravure printing is a direct printing technique for printing a sheet or roll material, in particular, a strip material.
  • Such technique involves a pressure roller and a printing roller, both rotating about the rotation axes thereof, and pressed against each other, so that they may rotate together, and so as to feed and print during the rotation, a material interposed therebetween.
  • the printing roller has an outer surface, generally cylindrical, having a plurality of grooves or cells, corresponding to a figure to be printed on the sheet or roll material, and adapted to receive within them respective quantities of ink to be transferred to the surface of the sheet or roll material.
  • the ink is generally liquid and contained in an ink tank in which a portion of the lateral surface of the printing roller is immersed, so that the outer printing roller surface may be progressively wetted into the ink during the rotation thereof.
  • the excess of ink on the outer printing roller surface is generally removed by using a blade, or doctor blade, arranged so as to scrub such outer printing roller surface of the printing roller and remove the ink which remains outside the grooves or cells.
  • the printing roller is coated with a copper layer which defines the engraved outer surface thereof.
  • the pressure roller is coated with a coating layer, or sleeve, made of elastomeric material.
  • the elasticity of the coating material of the pressure roller which is pressed against the printing roller, with the sheet or roll material to be printed interposed, allows pressing the sheet or roll material to be printed on the grooves, or cells, of the printing roller, so as to transfer the ink contained in such cells to the sheet or roll material to be printed.
  • the presence of such surface charge has the purpose of generating an electric field between the pressure roller and the printing roller, through the sheet or roll material to be printed, interposed therebetween.
  • Such electric field helps to polarize the ink contained in the grooves, or cells, of the printing roller, to attract it against the sheet or roll material to be printed, considerably improving the ink coverage of the printed areas and, therefore, the resulting print quality, which is consequently more detailed and precise.
  • US 5 205 212 A discloses a method of gravure printing utilizing electrostatic assist in the transfer of ink from a printing cylinder to a paper web.
  • the potential of electrets formed in dry ink on the web is minimized by operating the last impression roll and cylinder with a DC potential of the polarity opposite that of the preceding impression rolls.
  • Such inlet and outlet anti-static bars have a plurality of electrodes operatively facing the sheet or roll material, and are supplied, by means of a special electrostatic generator, with polarity alternating over time, in an attempt to remove both the positive and the negative charges.
  • the ink remains polarized with electrostatic charges with a polarity equal to the charges distributed by the electrostatic printing aid apparatus associated with the pressure roller.
  • the printing unit 1 comprises a printing roller 20, a pressure roller 10, pressing means 60 for pressing said pressure roller 10 against said printing roller 20, an electrostatic printing aid apparatus 50 associated with said pressure roller 10, an electrostatic neutralization bar 110 arranged at the outlet with respect to said pressure roller 10 according to a feeding direction 73 of the material 74.
  • the pressure roller body 11 defines a rotation axis of the pressure roller 12 and a pressure roller body lateral surface 13.
  • the pressure roller sleeve 30 comprises an outer layer 32 made of elastomeric material delimited by the outer sleeve lateral surface 31.
  • the elastomeric material is selected from synthetic rubber and natural rubber.
  • the electrostatic printing aid apparatus 50 associated with said pressure roller 10 is configured to transmit electrostatic charges having a first electrical polarity to said outer lateral surface 31 of said sleeve 30.
  • the electrostatic bar 110 comprises at least one row of electrodes and an electrostatic generator connected to said electrodes.
  • the electrodes are adapted to supply a preset electrical voltage and to be crossed by a preset current, during use.
  • the preset electrical voltage supplied by the electrodes of the electrostatic neutralization bar 110 is preferably lower than 8 kVolts, even more preferably between 6 kVolts and 8 kVolts.
  • the preset electrical voltage supplied by the electrodes of the electrostatic neutralization bar 110 is preferably lower than the preset electrical voltage presented to the electrodes of the non-contact electrostatic charge bar 53, which will be described below.
  • Such voltage of the electrostatic neutralization bar 110 may be measured by means of a high voltage probe, placed in electrical contact with said electrodes and capable of measuring the voltage difference between said electrodes and the ground.
  • the electrostatic generator is supplied at low voltage, preferably at about 24 Volts.
  • the electrical cables which carry the power supply to the electrostatic bar 110 are supplied at low voltage, thus avoiding the risks deriving from a high voltage.
  • the charge generator is incorporated within said electrostatic bar 110.
  • Such charges distributed on the outer sleeve lateral surface 31, have the function of electrostatically attracting the ink collected in the grooves, or small cells, of the outer lateral surface of the printing roller, which is arranged on the opposite side of the pressure roller with respect to the sheet material.
  • the ink is attracted towards the surface of the sheet material to be printed, facing the printing roller.
  • the ink collected in the small cells of the printing roller is polarized.
  • the outer sleeve layer 32 made of elastomeric material is semiconductive.
  • Semiconductive elastomeric material means an elastomeric material which has an electrical resistance, and therefore a conductivity, of a preset value.
  • the resistance may be considered as the surface resistance between two points of the outer sleeve lateral surface, or as the insulation resistance between the outer sleeve lateral surface and the inner sleeve lateral surface.
  • Both the surface resistance value and the insulation resistance value are chosen according to the printing needs.
  • said inner sleeve lateral surface 33 may comprise, in accordance with an embodiment, an electrically conductive surface portion 96 electrically connected to said outer sleeve layer 32, for example, by means of an electric resistance element 97, so that when the sleeve 30 is fitted on the pressure roller body 10, said electrically conductive surface portion 96 is in electrical contact with a corresponding conductive portion of said pressure roller body lateral surface 13.
  • the conductive portion of said pressure roller body lateral surface 13 is connected with an electrical ground connection 95 to earth 100.
  • the semiconductivity of the sleeve allows the charges to cross the thickness of the sleeve 30 from the outer sleeve lateral surface 31 towards the roller body lateral surface 13, and then to earth 100 by means of the electrical ground connection 95.
  • the conductive annular element is made of carbon.
  • Such electrodes of the non-contact electrostatic charge bar 53 of the electrostatic printing aid apparatus are adapted to present a preset electrical voltage and to be crossed by a preset current during use.
  • such preset electrical voltage presented to the electrodes of the non-contact electrostatic charge bar 53 is between 9 kVolts and 11 kVolts, preferably it is about 10 kVolts.
  • the non-contact electrostatic charge bar 53 of the electrostatic printing aid apparatus comprises an electrostatic charge generator connected to said electrodes and arranged inside said electrostatic charge bar, said generator being preferably supplied at low voltage, for example at 24 Volts.
  • the electrical supply cables connected to the electrostatic charge bar 53 are supplied at low voltage, thus avoiding the risks on the operational safety of the machine which, instead, would be caused by high voltage.
  • the electrostatic printing aid apparatus 50 comprises an electrostatic charge transmitter of the direct charging type 51, configured to transmit, to the outer lateral surface 31 of the sleeve 30, the electrostatic charges having the first electrical polarity from the interior of the pressure roller 10 towards the exterior of the pressure roller 10, through said sleeve 30, by means of a direct electrical connection between the electrostatic charge transmitter and the pressure roller body lateral surface 13.
  • the outer sleeve layer 32 made of elastomeric material is preferably conductive.
  • the electrostatic charge generator is preferably integrated inside the pressure roller 10, or arranged axially in contact with said pressure roller 10, or arranged at an axial end of the pressure roller 10.
  • the electrostatic charge generator of the electrostatic charge transmitter of the direct charging type 53 is adapted to be supplied at low voltage, preferably at about 24 Volts.
  • the electrical supply cables connected to the electrostatic charge generator integrated inside the pressure roller are supplied at low voltage, thus avoiding the risks on the operational safety of the machine which, instead, may be caused by high voltage.
  • the printing unit 1 comprises at least one anti-static outlet bar 72 interposed between the pressure roller 10 and the electrostatic bar 110.
  • the anti-static outlet bar 72 comprises at least one row of electrodes and an electrostatic discharge generator, said electrodes being adapted to face said sheet or roll material 74 at the outlet with respect to said pressure roller 10, and adapted to be excited, by means of said generator, with electrostatic charges of alternating sign over time, so as to remove both the positive and the negative charges from the material 74 at the outlet with respect to the pressure roller 10.
  • the electrostatic neutralization bar 110 is arranged downstream of the pressure roller and before a drying oven.
  • the electrostatic neutralization bar 110 is adapted to neutralize the ink before the drying thereof by means of the drying oven, and the drying oven is adapted to dry the ink after having been neutralized by means of the electrostatic bar 110.
  • the electrostatic bar 110 is interposed between the anti-static outlet bar 70 and the drying oven.
  • the printing unit 1 comprises said drying oven.
  • each printing unit 1 on a printing line having a plurality of printing units 1 in sequence comprises a respective electrostatic neutralization bar 110 arranged downstream of the pressure roller 10 and before a drying oven.
  • each printing unit 1 on a printing line having a plurality of printing units 1 in sequence comprises a respective electrostatic neutralization bar 110 interposed between the anti-static outlet bar 70 and the drying oven.
  • the printing unit 1 comprises at least one anti-static inlet bar 71 arranged at the inlet with respect to the pressure roller 10 according to the feeding direction 73 of the sheet or roll material 74.
  • said anti-static inlet bar 71 comprises at least one row of electrodes and an electrostatic discharge generator, said electrodes being adapted to face said sheet or roll material 74 at the inlet with respect to the pressure roller 10, and adapted to be excited, by means of said generator, with electrostatic charges of alternating sign over time, so as to remove both the positive and the negative charges from the material 74 at the inlet with respect to the pressure roller 10.
  • the sheet or roll material 74 comprises a film, or a layer, made of polymeric material.
  • the sheet or roll material 74 comprises a paper layer and/or a fabric layer.
  • the printing unit comprises a pair of anti-static bars 70, of which one anti-static inlet bar 71 is arranged at the inlet with respect to the pressure roller 10, and one anti-static outlet bar 72 is arranged at the outlet with respect to the pressure roller 10, proceeding according to said feeding direction 73, said anti-static inlet bar 71 and said anti-static outlet bar 72 being configured to remove the electrostatic charges from the sheet or roll material at the inlet and at the outlet of the pressure roller 10.
  • the anti-static inlet bar 71 and/or the anti-static outlet bar 72 each comprise a respective electrostatic charge generator inside them.
  • the anti-static inlet bar 71 and/or the anti-static outlet bar 72 are supplied at low voltage, preferably at about 24 Volts.
  • the printing unit 1 comprises a guide roller 111 arranged upstream of the electrostatic bar 110, adapted to guide the sheet or roll material 74 at the inlet of the electrostatic bar 110.
  • the guide roller 111 is interposed between the anti-static outlet bar 72 and the electrostatic bar 110.
  • the printing unit 1 comprises at least one tensioning roller 65, 66, arranged on at least one side with respect to the pressure roller 10, adapted to press on the substrate, or sheet or roll material to be printed, so as to keep it tense.
  • a first roller 65 of said two guide rollers is interposed between the anti-static inlet bar 71 and the pressure roller 10
  • a second roller 66 of said two guide rollers is interposed between the roller presser 10 and the anti-static outlet bar 72.
  • each of said at least one tensioning roller 65, 66, or each of said two tensioning rollers 65, 66 has a rotation axis which is parallel to the rotation axis of the pressure roller 10.
  • the method further comprises the steps of:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Claims (11)

  1. Druckeinheit (1) zum Tiefdruck eines Bogen- oder Rollenmaterials (74), umfassend:
    - eine Druckwalze (20), die eine Druckwalzendrehachse (22) und eine äußere Druckwalzenseitenfläche (21) definiert;
    - eine Andruckwalze (10), umfassend einen Andruckwalzenkörper (11) und eine Andruckwalzenhülse (30), die auf den Andruckwalzenkörper (11) aufgesetzt bzw. aufsetzbar ist, wobei der Andruckwalzenkörper (11) eine Andruckwalzendrehachse (12) und eine Seitenfläche des Andruckwalzenkörpers (13) definiert; wobei die Andruckwalzenhülse (30) eine röhrenförmige Form aufweist, die eine äußere Hülsenseitenfläche (31) und eine innere Hülsenseitenfläche (33) definiert, wobei die Andruckwalzenhülse (30) eine äußere Schicht (32) aus Elastomermaterial aufweist, die durch die äußere Hülsenseitenfläche (31) begrenzt ist;
    - Andruckmittel (60) zum Andrücken der Andruckwalze (10) gegen die Druckwalze (20), sodass eine Drehung der Andruckwalze (10) und der Druckwalze (20) das Bogen- oder Rollenmaterial (74) zuführen kann, das zwischen der äußeren Druckwalzenseitenfläche (21) und der äußeren Hülsenseitenfläche (31) entsprechend einer Zuführrichtung (73) des Materials (74) angeordnet ist;
    - eine elektrostatische Druckhilfsvorrichtung (50), die mit der Andruckwalze (10) verbunden und so konfiguriert ist, dass sie elektrostatische Ladungen mit einer ersten elektrischen Polarität auf die äußere Seitenfläche (31) der Hülse (30) überträgt;
    - einen elektrostatischen Stab (110), der am Auslass in Bezug auf die Andruckwalze (10) entsprechend der Zuführrichtung (73) des Materials (74) angeordnet ist und so ausgelegt ist, dass er dem Material (74) zugewandt ist, wobei der elektrostatische Stab (110) dazu konfiguriert ist, elektrostatische Ladungen mit einer zweiten elektrischen Polarität, die der ersten elektrischen Polarität entgegengesetzt ist, auf das Material (74) zu übertragen, um verbleibende elektrische Ladungen mit der ersten elektrischen Polarität zu neutralisieren, die mit dem Material (74) stromabwärts der Andruckwalze (10) verbunden blieben;
    - einen antistatischen Auslassstab (72), der zwischen der Andruckwalze (10) und dem elektrostatischen Stab (110) angeordnet ist, wobei der antistatische Auslassstab (72) mindestens eine Reihe von Elektroden und einen elektrostatischen Entladungsgenerator umfasst, wobei die Elektroden so ausgelegt sind, dass sie dem Bogen- oder Rollenmaterial (74) am Auslass in Bezug auf die Andruckwalze (10) zugewandt sind und so ausgelegt sind, dass sie mittels des elektrostatischen Entladungsgenerators mit elektrostatischen Ladungen wechselnden Vorzeichens über die Zeit angeregt werden, um sowohl die positiven als auch negativen Ladungen vom Material (74) am Auslass in Bezug auf die Andruckwalze (10) zu entfernen.
  2. Druckeinheit (1) nach Anspruch 1, wobei der elektrostatische Stab (110) mindestens eine Reihe von Elektroden und einen mit den Elektroden verbundenen elektrostatischen Generator umfasst.
  3. Druckeinheit (1) nach Anspruch 2, wobei die Elektroden so ausgelegt sind, dass sie während des Gebrauchs eine voreingestellte elektrische Spannung liefern und von einem voreingestellten Strom durchflossen werden.
  4. Druckeinheit (1) nach Anspruch 3, wobei die voreingestellte Spannung und/oder der voreingestellte Strom einstellbar sind.
  5. Druckeinheit (1) nach mindestens einem der Ansprüche 2 bis 4, wobei der elektrostatische Generator mit Niederspannung, vorzugsweise etwa 24 Volt, versorgt wird.
  6. Druckeinheit (1) nach mindestens einem der Ansprüche 2 bis 5, wobei der elektrostatische Generator innerhalb des elektrostatischen Stabs (110) untergebracht ist.
  7. Druckeinheit (1) nach mindestens einem vorhergehenden Anspruch, wobei die elektrostatische Druckhilfsvorrichtung (50) einen berührungslosen oder von oben ladenden elektrostatischen Ladungsstab (53) umfasst, der so konfiguriert ist, dass er die elektrostatischen Ladungen mit der ersten elektrischen Polarität von der Außenseite der Andruckwalze auf die äußere Seitenfläche (31) der Hülse (30) überträgt, wodurch ein elektrischer Kontakt mit der äußeren Seitenfläche (31) der Hülse (30) vermieden wird.
  8. Druckeinheit (1) nach Anspruch 7, wobei die äußere Hülsenschicht (32) aus Elastomermaterial halbleitend ist.
  9. Druckeinheit (1) nach mindestens einem der Ansprüche 1 bis 6, wobei die elektrostatische Druckhilfsvorrichtung (50) einen elektrostatischen Ladungsgeber (51) vom Direktladetyp umfasst, der so konfiguriert ist, dass er die elektrostatischen Ladungen mit der ersten elektrischen Polarität vom Inneren der Andruckwalze (10) durch die Hülse (30) hindurch zur Außenseite der Andruckwalze (10) auf die äußere Seitenfläche (31) der Hülse (30) überträgt, und zwar mittels einer direkten elektrischen Verbindung zwischen dem elektrostatischen Ladungsgeber und der Seitenfläche des Andruckwalzenkörpers (13).
  10. Druckeinheit (1) nach Anspruch 9, wobei die äußere Hülsenschicht (32) aus Elastomermaterial leitend ist.
  11. Druckeinheit (1) nach mindestens einem vorhergehenden Anspruch, umfassend mindestens einen antistatischen Einlassstab (71), der am Einlass in Bezug auf die Andruckwalze (10) entsprechend der Zuführrichtung (73) des Bogen- oder Rollenmaterials (74) angeordnet ist, wobei der antistatische Einlassstab (71) mindestens eine Reihe von Elektroden und einen elektrostatischen Entladungsgenerator umfasst, wobei die Elektroden so ausgelegt sind, dass sie dem Bogen- oder Rollenmaterial (74) am Einlass in Bezug auf die Andruckwalze (10) zugewandt sind und so ausgelegt sind, dass sie mittels des elektrostatischen Entladungsgenerators mit elektrostatischen Ladungen wechselnden Vorzeichens über die Zeit angeregt werden, um sowohl die positiven als auch negativen Ladungen vom Material (74) am Einlass in Bezug auf die Andruckwalze (10) zu entfernen.
EP20175984.2A 2019-06-10 2020-05-22 Rotationstiefdruckeinheit Active EP3750710B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000008466A IT201900008466A1 (it) 2019-06-10 2019-06-10 Gruppo di stampa per stampa a rotocalco

Publications (2)

Publication Number Publication Date
EP3750710A1 EP3750710A1 (de) 2020-12-16
EP3750710B1 true EP3750710B1 (de) 2023-12-27

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ID=68073085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20175984.2A Active EP3750710B1 (de) 2019-06-10 2020-05-22 Rotationstiefdruckeinheit

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EP (1) EP3750710B1 (de)
IT (1) IT201900008466A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4440082A (en) * 1978-11-13 1984-04-03 Dayco Corporation Electrostatically assisted printing system
US5205212A (en) * 1989-03-17 1993-04-27 Wolfe Gene H Method of reducing ink electrets in gravure web printing
DE202006016178U1 (de) * 2006-10-19 2008-03-06 Dettke, Christa Rotationsdruckmaschine
ITUA20162595A1 (it) * 2016-04-14 2017-10-14 Ace Di Barbui Davide & Figli Srl Apparecchiatura per l'assistenza elettrostatica alla stampa a rotocalco.

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IT201900008466A1 (it) 2020-12-10
EP3750710A1 (de) 2020-12-16

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