EP1034078B2 - Dispositif electrostatique pour rotogravure et flexographie - Google Patents

Dispositif electrostatique pour rotogravure et flexographie Download PDF

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Publication number
EP1034078B2
EP1034078B2 EP97913072A EP97913072A EP1034078B2 EP 1034078 B2 EP1034078 B2 EP 1034078B2 EP 97913072 A EP97913072 A EP 97913072A EP 97913072 A EP97913072 A EP 97913072A EP 1034078 B2 EP1034078 B2 EP 1034078B2
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EP
European Patent Office
Prior art keywords
layer
voltage electrode
plate cylinder
impression roller
printing plate
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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.)
Expired - Lifetime
Application number
EP97913072A
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German (de)
English (en)
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EP1034078B1 (fr
EP1034078A2 (fr
Inventor
Alfred Doppler
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Spengler Electronic AG
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Spengler Electronic AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • 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

Definitions

  • the present invention relates to an arrangement to transfer an electrostatic charge within a gravure and flexographic printing press for improvement the print quality by polarizing the ink droplets on the printing plate cylinder.
  • the electrostatic charge is applied to the outer jacket of a printing press, from which she flows to the outer shell of the printing forme cylinder.
  • the flexographic printing unit brings the electrostatic charge on the printing forme cylinder, from which they to both the substrate transfer roller and the Impression cylinder flows. Under the influence of a applied electric field are in the Cups of the plate cylinder (gravure printing) or the on the surface of the plate cylinder (flexo printing) polarized color molecules, and the color droplets experience a total volume increase.
  • FIGS. 1A and 1 D in connection with Figure 1C show a two-roll system of a gravure printing unit with a multi-layer impression 1 - here according to the invention already three layers - the printing form cylinder 2 and between the two guided over the guide roller 3 substrate 4.
  • a bar-shaped voltage electrode 5 extending over its entire length is arranged.
  • the inking doctor 6 is indicated for wiping off excess-applied ink from the printing form cylinder 2.
  • the inking roller and the return, which are not shown, are seated in a paint trough 7 .
  • the voltage electrode 5 is connected to a high voltage source 8 .
  • the jacket of the three-layer impression roller 1 has a semiconductor layer 10 on the outside and a high-conductor layer 11 underneath. Below the high-conductor layer 11, as electrical insulation to the impression core 13, there is an insulator layer 12 .
  • FIG. 1B shows a three-roller system which, unlike the previously described two-roller system, has an additionally arranged support roller 9 above the multi-layer impression roller 1 , which is preferably electrically insulated.
  • the voltage electrode 5 is positioned here laterally of the multi-layer impression roller 1 .
  • FIG. 1E with the electrical circuit diagram of the two- or three-roller system according to FIGS. 1A to 1D illustrates the flow of current within the electrostatic arrangements.
  • a DC voltage U is supplied and the voltage electrode 5 has the internal resistance R 1 .
  • the upper semiconductor layer 10 and the high-conductor layer 11 form the resistors R 3 , R 4 .
  • the grounded insulator layer 12 acts as an excessively large resistor R 5 .
  • the current flows through the underlying semiconductor layer 10, which here forms the resistor R 6 , further through the printing material 4, which represents the resistor R 7 .
  • Practically the resistance value R 8 0 has the grounded pressure cylinder 2.
  • the main part of the electric current takes the path of the lower resistance via the high-conductor layer 11, while a small fraction flows directly over the semiconductor layer 10 to the printing substrate 4 .
  • a voltage drop .DELTA.U which represents the so-called nip voltage, which is decisive for the polarization of the color droplets in the cups of the plate cylinder 2 .
  • the current I flows, starting from the voltage electrode 5, to the ground terminal E.
  • electrostatic arrangement is a voltage electrode in the form of a brush in direct electrical Contact with a semiconductor layer of a multilayer impression roller.
  • DE-U-9419 540 is an electrostatic Arrangement described in which a voltage electrode at a distance to an outer semiconductor layer of a Three-layer impression rollers with one under the semiconductor layer lying Hochleiter für and an underlying Insulator layer attached to the impression core adjacent, is arranged.
  • the as a sheet metal part, grid or the like formed voltage electrode and form the semiconductor layer and the high-conductor layer a capacitor used for transmission of AC voltage suitable is.
  • the electrostatic arrangement according to the independent claim 1 is opposite to in DE-A-27 09 254 described electrostatic Arrangement delimited.
  • the invention is based on the object, an arrangement to create where a soiled voltage electrode quickly remove from a person, clean and reinstalled. Or you should the polluted Voltage electrode quickly against a clean Electrode can exchange for cleaning make the contaminated electrode externally. service costs and machine downtime must be lowered significantly.
  • the arrangement should be with electrodes as small a dimension as possible, in particular suitable for retrofitting of printing presses and the initial cost must be low being held. But for the print quality apply unabated high demands.
  • the rod-shaped voltage electrode As alternatives to the rod-shaped voltage electrode one found such, which the outer coat of the impression or the printing forme cylinder in one Spacing gap surrounded arcuately.
  • the homogeneous Charge distribution over the entire contact pressure range is achieved by using the relatively low-impedance high-conductor layer of the impression roller or the printing plate cylinder in the axial direction and the other hand, high impedance Semiconductor layer achieved in the radial direction.
  • FIGS. 2A and 2B are identical to FIGS. 2A and 2B.
  • the three-layer impression roller 1 has a jacket over the impression roller core 13 which consists externally of a semiconductor layer 10, an underlying high-conductor layer 11 and an underlying insulator layer 12 adjoining the impression core 13 . All three layers 10, 11, 12 extend as far as the end faces of the impression roller 1 , so that an electrical short circuit can occur, in particular when they are soiled, for example by paint residues. To prevent this, various insulating precautions are taken.
  • the high-conductor layer 11 is preferably large-volume and is for example at least 1/3 of the thickness of the semiconductor layer 10.
  • the Hochleiter- and the insulating layer 11,12 to the adjacent regions of the outer semiconductor layer 10 and the inner roll core 13 are each provided frontally with an insulating coating 14 for insulation purposes.
  • the front-side insulation is here by a recessed on both sides shortening of high-conductor and semiconductor layer 11,10 and filling the space formed by the shortening with the quasi up to the outer surface of the semiconductor layer 10 pulled up, overlapping insulator layer 12 , which the cut edges of both shortened layers 11,10 surrounds, reaches.
  • the outermost semiconductor layer 10 is shortened from the left end side so that an annular surface 110 of the high-conductor layer 11 underlying the semiconductor layer 10 is exposed.
  • an insulator coating 14 on this end face, which covers the high-conductor layer 11 and the underlying insulator layer 12 and extends as far as the edge region of the adjoining impression core 13 .
  • the exposed ring surface 110 makes it possible to apply thereto a voltage electrode 5a, 5b, 5c (see the other figures).
  • FIGS. 3A and 3B are identical to FIGS. 3A and 3B.
  • the rod-shaped voltage electrode 5 which is provided as an inductor for the contactless application to the impression roller 1 , is known in its construction per se.
  • emission needles 51 are systematically arranged in series, for example at a distance of 1 cm. Behind each emission needle 51 , a protective resistor 52 is connected. Emission needles 51 and protective resistors 52 are advantageously positioned on a printed circuit board, which is inserted into the insulating body 50 and, for example, cast with synthetic resin.
  • the terminal contact of the voltage electrode 5 is connected to the high voltage source 8 , so that the voltage U is applied.
  • This likewise rod-shaped voltage electrode 5a differs from the embodiment according to FIG. 3A only in that, instead of a row of emission needles 51, three axially extending rows of emission needles 51 are provided. Thus, the length of the voltage electrode 5a can be further shortened and / or the required high voltage U lowered.
  • the number of emission needles 51 can be further reduced for a voltage electrode 5a -here arranged in an approximately square field-and thus further reduce the dimension of the voltage electrode 5a .
  • the emission needles 51 are arranged within a circular area, and the insulation body 50 has a cylindrical shape.
  • a contactless inductor electrode in its length for example, to 1/6 of the length of the three-layer impression roller 1 shortened rod-shaped voltage electrode 5a is placed in a gravure printing on a impression roller 1 with a gap distance S.
  • the voltage electrode 5a can advantageously be arranged in all positions in the semicircle around the impression roller 1 over the moving web of the printing material 4 .
  • the arrangement of the voltage electrode 5a is directed below the printing substrate 4 and on the semiconductor layer 10 of the impression roller 1 , conceivable.
  • the voltage electrode 5a is connected to the high voltage source 8 , so that a current flow from the voltage electrode 5a through the impression roller 1 and the polarization of the color molecules in the wells of the plate cylinder 2 is formed.
  • the applied high voltage up to 30kV DC, and the air gap S is set with 5mm to 30mm, preferably here with 5mm to 15mm.
  • substrates 4 all common types and grades of paper, plastic films, textiles and coated or coated with insulating paint metal foils into consideration. All color systems that can be used on rotogravure presses, such as Tuluol, alcohol or ethyl acetate-based inks, as well as watercolors, can be used for packaging and commercial printing.
  • FIGS. 5A and 5B are identical to FIGS. 5A and 5B.
  • the voltage electrode 5c has a half-shell shape and surrounds the three-layer impression roller 1 with a gap distance S.
  • the voltage electrode 5c extends with its insulator body 50 in an arc over 180 °, wherein therein a series of emission needles 51st is provided.
  • the voltage electrode 5c will be arranged at least near one end of the impression roller 1 .
  • the length of the arcuate tension electrode 5c corresponds approximately to half the outer circumference of the impression roller 1 , if the necessary increase due to the gap distance S is disregarded.
  • the flexographic printing unit has the three-layer printing form cylinder 20 , the substrate transfer roller 30 (also called inking roller or anilox roller) arranged underneath, and the counter-pressure cylinder 40 (also called the pressure roller) lying at the level of the three-layer printing plate cylinder 20 . Between the three-layer printing form cylinder 20 and the impression cylinder 40 , the web of the printing material 4 passes through.
  • a shortened rod-shaped voltage electrode 5a is placed with a gap distance S , which acts as a contactless inductor and z. B. about 1/6 of the length of the three-layer printing forme cylinder 20 has.
  • the voltage electrode 5a is seated at one end of the three-layer printing plate cylinder 20 so as to facilitate the lateral access for service work.
  • the substrate transfer roller 30 is supplied with the ink from a scoop roller 60 , which dips into the ink tray 7 .
  • the voltage electrode 5a can be variably arranged in all positions in the semicircle about the three-layer printing form cylinder 20 in the two free spaces between substrate transfer roller 30 and impression cylinder 40 .
  • the three-layer printing form cylinder 20 has on the outside the cliché 24 made of semiconductor material, underneath a high-conductivity layer 21 and below the latter an insulator layer 22 .
  • the insulator layer 22 is seated on the inner cylinder core 23 .
  • the voltage electrode 5a is connected to the high voltage source 8 ;
  • State-of-the-art flexographic printing units also do without a scoop roller 60 .
  • the ink is sprayed onto the substrate transfer roller 30 with a comb blade 6a ; excess ink absorbs the comb scraper 6a .
  • the invention is now an electrostatic Arrangement as printing aid for gravure and flexographic printing units available, the service work, in particular the cleaning, much easier.
  • Special Advantages arise in the accessibility during service work through the reduced dimensions opposite the previously used voltage electrodes, especially when the voltage electrode in an end region of the impression roller or printing forme cylinder is arranged. Due to the smaller field extent Deposits on machine parts are reduced of undesired charged particles, namely Color fog and abrasion from the substrate.
  • the inventive Arrangement brings through the facilitated Assembly and the lower material costs significantly Cost advantages. Losses in the homogeneity of the Polarization over the entire printing width does not occur on. Priority favorable is the arrangement for retrofitting of already in operation printing presses. The inventive arrangement thus satisfies in principle a long-felt need, wherein the professional world for decades on the dogma of necessity widely extended voltage electrodes of the local Type of electrostatic printing aids arrested.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (10)

  1. Dispositif électrostatique pour une unité d'héliogravure, comprenant :
    a) un rouleau presseur à plusieurs couches (1), une électrode de tension (5a, 5c) disposée à distance de ce dernier avec un interstice d'air (S) et un cylindre à forme d'impression (2),
    b) l'électrode de tension (5a, 5c) contenant comme électrode inductrice des aiguilles d'émission (51) disposées à distance l'une de l'autre, à partir des pointes desquelles, en situation de fonctionnement dans laquelle une tension continue est appliquée à l'électrode de tension (5a, 5c), un courant pénètre dans le rouleau presseur (1) par l'interstice d'air (S) ionisé,
    c) le passage d'une bande d'un matériau à imprimer (4) étant prévu entre le rouleau presseur (1) et le cylindre à forme d'impression (2), et
    d) le dispositif étant destiné à polariser les molécules d'encre présentes dans les cuvettes du cylindre à forme d'impression (2),
    caractérisé en ce que
    e) le rouleau presseur à plusieurs couches est un rouleau presseur à trois couches (1) avec une couche extérieure semi-conductrice (10), une couche sous-jacente hautement conductrice (11) et une couche d'isolant (12) située par-dessous et adjacente au noyau (13) du rouleau presseur, et
    f) l'électrode de tension (5a, 5c) est disposée avec un interstice d'air (S) à distance radiale de la couche semi-conductrice (10);
    g) une électrode de tension (5a) s'étendant axialement le long du rouleau presseur (1) présentant une longueur comprise dans la plage d'environ ≤ 50 %, de préférence d'environ ≤ 10 % de la longueur du rouleau presseur (1), ou
    h) une électrode de tension (5c) s'étendant radialement autour du rouleau presseur (1) présentant un arc de cercle compris dans la plage d'environ ≤ 270°, de préférence d'environ ≤ 30°.
  2. Dispositif électrostatique pour une unité de flexographie, comprenant :
    a) un cylindre à forme d'impression (20) à plusieurs couches, une électrode de tension (5a, 5b, 5c) disposée à distance de ce dernier avec un interstice d'air (S), un cylindre (30) de transfert de substrat et un cylindre de contre - pression (40),
    b) l'électrode de tension (5a, 5b, 5c) contenant comme électrode inductrice des aiguilles d'émission (51) situées à distance l'une de l'autre, à partir des pointes desquelles, en situation de fonctionnement dans laquelle une tension continue est appliquée sur l'électrode de tension (5a, 5b, 5c), du courant pénètre dans le cylindre à forme d'impression (20) à plusieurs couches à travers l'interstice d'air (S) ionisé,
    c) le passage de la bande d'un matériau à imprimer (4) étant prévu entre le cylindre à forme d'impression (20) à plusieurs couches et le cylindre de contre - pression (40), et
    d) le dispositif étant destiné à la polarisation des molécules d'encre sur le cylindre (30) de transfert de substrat et sur le cylindre à forme d'impression (20) à plusieurs couches,
    caractérisé en ce que
    e) le cylindre à forme d'impression à plusieurs couches est un cylindre à forme d'impression (20) à trois couches, avec une couche extérieure semi-conductrice servant de cliché (24), une couche hautement conductrice (21) sous-jacente et une couche d'isolant (22) située par-dessous la précédente et adjacente au noyau (23) du cylindre, et l'électrode de tension (5a, 5b, 5c)
    f) est disposée avec un interstice d'air (S) à distance du cliché semi-conducteur (24) ; ou
    g) est disposée avec l'interstice d'air (S) à distance d'une surface frontale de la couche hautement conductrice (21) ; ou
    h) est disposée avec l'interstice d'air (S) à distance d'une surface annulaire ouverte de la couche hautement conductrice (21) ;
    i) une électrode de tension (5a, 5b) qui s'étend dans la direction axiale présentant une longueur comprise dans la plage d'environ ≤ 50 %, de préférence d'environ ≤ 10 % de la longueur du cylindre à forme d'impression à trois couches (20), ou
    j) une électrode de tension (5c) qui s'étend radialement autour du cylindre à forme d'impression à trois couches (20) présentant un arc de cercle compris dans la plage d'environ ≤ 270°, de préférence d'environ ≤ 30°.
  3. Dispositif électrostatique selon la revendication 1 ou 2, caractérisé en ce que les aiguilles d'émission (51) de l'électrode de tension (5a, 5b, 5c) sont systématiquement écartées l'une de l'autre.
  4. Dispositif électrostatique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que sur le rouleau presseur (1) ou selon le cas sur le cylindre à forme d'impression (20) à trois couches est prévu, chaque fois du côté frontal, un revêtement isolant (14) qui recouvre les surfaces de coupe de la couche hautement conductrice (11, 21) et de la couche d'isolant (12, 22) et qui s'étend jusque dans les zones adjacentes de la couche semi-conductrice (10, 24) disposée par-dessus ainsi que jusque dans celles du noyau (13, 23) disposé par-dessous.
  5. Dispositif électrostatique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que sur le rouleau presseur (1) ou selon le cas sur le cylindre à forme d'impression (20) à trois couches, la couche fortement conductrice (11, 21) est chaque fois reculée par raccourcissement du côté frontal, et l'espace libre résultant du raccourcissement est rempli jusqu'à la couche d'isolant (12, 22) par la couche semi-conductrice (10, 24) qui s'étend qui vers le bas et qui entoure les bords de coupe de la couche (11, 21) raccourcie.
  6. Dispositif électrostatique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que sur le rouleau presseur (1) ou selon le cas sur le cylindre à forme d'impression (20) à trois couches, la couche semi-conductrice (10, 24) et la couche fortement conductrice (11, 21) sont chaque fois reculées par raccourcissement du côté frontal, et l'espace libre résultant du raccourcissement est rempli par la couche d'isolant (12, 22) qui s'étend vers le haut jusqu'au côté supérieur extérieur de la couche semi-conductrice (10, 24) et qui entoure les bords de coupe des couches (10, 11; 24, 21) raccourcies.
  7. Dispositif électrostatique selon l'une des revendications 1 à 6, caractérisé en ce que la haute tension (U) appliquée sur les électrodes de tension (5a, 5b, 5c) peut monter jusqu'à 30 kV.
  8. Dispositif électrostatique selon l'une des revendications 1 à 7, caractérisé en ce que l'électrode de tension (5a, 5b, 5c) est disposée à une distance d'interstice efficace (8) comprise entre 5 mm et 30 mm sur le rouleau presseur (1) ou selon le cas sur le cylindre à forme d'impression à trois couches (20).
  9. Dispositif électrostatique selon l'une des revendications 1 à 8, caractérisé en ce que l'électrode de tension (5a, 5b, 5c) est disposée dans une zone d'extrémité du rouleau presseur (1) ou selon le cas du cylindre à forme d'impression à trois couches (20).
  10. Dispositif électrostatique selon l'une des revendications 1 à 9, caractérisé en ce que l'épaisseur de la couche hautement conductrice (11, 21) s'élève à au moins 1/3 de l'épaisseur de la couche semi-conductrice (10, 24).
EP97913072A 1997-11-27 1997-11-27 Dispositif electrostatique pour rotogravure et flexographie Expired - Lifetime EP1034078B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH1997/000447 WO1998003049A2 (fr) 1997-11-27 1997-11-27 Dispositif electrostatique pour rotogravure et flexographie

Publications (3)

Publication Number Publication Date
EP1034078A2 EP1034078A2 (fr) 2000-09-13
EP1034078B1 EP1034078B1 (fr) 2002-03-06
EP1034078B2 true EP1034078B2 (fr) 2005-08-17

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EP97913072A Expired - Lifetime EP1034078B2 (fr) 1997-11-27 1997-11-27 Dispositif electrostatique pour rotogravure et flexographie

Country Status (7)

Country Link
US (1) US6578478B2 (fr)
EP (1) EP1034078B2 (fr)
AT (1) ATE213997T1 (fr)
AU (1) AU5046098A (fr)
DE (1) DE59706583D1 (fr)
ES (1) ES2173430T5 (fr)
WO (1) WO1998003049A2 (fr)

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US6314879B1 (en) * 1999-05-12 2001-11-13 Hurletron Incorporated Flexographic printing apparatus
DE202004014952U1 (de) * 2004-09-25 2006-02-02 Dettke, Christa Elektrode für eine Rotationsdruckmaschine und elektrostatische Druckhilfe
DE202006016178U1 (de) * 2006-10-19 2008-03-06 Dettke, Christa Rotationsdruckmaschine
EP2209630B1 (fr) 2007-11-07 2016-03-09 Alfred Doppler Rouleau presseur
DE102008006269B3 (de) * 2008-01-25 2009-05-14 Eltex-Elektrostatik Gmbh Presseur sowie dessen Verwendung
US8955434B2 (en) * 2009-08-11 2015-02-17 Xerox Corporation Apparatus for digital flexographic printing
US8820233B2 (en) * 2009-09-24 2014-09-02 Palo Alto Research Center Incorporated Anilox metering system for electrographic printing
US8869695B2 (en) * 2009-09-24 2014-10-28 Palo Alto Research Center Incorporated Anilox metering system for electrographic printing
ES2402151B1 (es) * 2011-10-17 2014-02-28 Miquel Y Costas & Miquel, S.A. Procedimiento de impresión monocapa de papel para artículos de fumar.
KR20140084291A (ko) * 2011-10-25 2014-07-04 유니-픽셀 디스플레이스, 인코포레이티드 플렉소그래픽 인쇄 롤 구성을 사용한 플렉소그래픽 인쇄
US8750769B2 (en) 2012-04-23 2014-06-10 Xerox Corporation Inferring toner contamination of electrodes from printing parameters
US12566397B2 (en) 2021-10-21 2026-03-03 Viavi Solutions Inc. Electrostatic printing method
US12083813B2 (en) 2021-10-21 2024-09-10 Viavi Solutions Inc. Printing machine and fixed patterned plate
US12481852B2 (en) 2021-11-12 2025-11-25 Viavi Solutions Inc. Article including an image including two or more types of pixels

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1772933A1 (fr) * 2005-10-06 2007-04-11 Eltex-Elektrostatik GmbH Structure d'électrodes haute tension
DE102005048002B4 (de) * 2005-10-06 2010-03-25 Eltex-Elektrostatik Gmbh Hochspannungselektrodenanordnung

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WO1998003049A3 (fr) 1998-10-01
AU5046098A (en) 1998-02-10
ATE213997T1 (de) 2002-03-15
DE59706583D1 (de) 2002-04-11
WO1998003049A2 (fr) 1998-01-29
US6578478B2 (en) 2003-06-17
ES2173430T5 (es) 2006-02-16
EP1034078B1 (fr) 2002-03-06
ES2173430T3 (es) 2002-10-16
US20030066443A1 (en) 2003-04-10
EP1034078A2 (fr) 2000-09-13

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