EP1034078B1 - Dispositif electrostatique pour rotogravure et flexographie - Google Patents

Dispositif electrostatique pour rotogravure et flexographie Download PDF

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Publication number
EP1034078B1
EP1034078B1 EP97913072A EP97913072A EP1034078B1 EP 1034078 B1 EP1034078 B1 EP 1034078B1 EP 97913072 A EP97913072 A EP 97913072A EP 97913072 A EP97913072 A EP 97913072A EP 1034078 B1 EP1034078 B1 EP 1034078B1
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EP
European Patent Office
Prior art keywords
layer
voltage electrode
plate cylinder
impression roller
printing plate
Prior art date
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Expired - Lifetime
Application number
EP97913072A
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German (de)
English (en)
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EP1034078A2 (fr
EP1034078B2 (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 for transmission an electrostatic charge within a Gravure and flexographic printing unit to improve print quality by polarizing the ink drops on the printing form cylinder.
  • the electrostatic Charge applied to the outer surface of a press from which they go to the outer jacket of the printing form cylinder flowing forth.
  • the electrostatic is brought into the flexographic printing unit Charge on the printing form cylinder, of which them to both the substrate transfer roller and the Counter pressure cylinder flows.
  • Under the influence of a applied electric field are those in the wells of the printing form cylinder (gravure) or that on the surface of the printing form cylinder (flexographic printing) Color molecules polarize, and learn the color droplets overall an increase in volume.
  • a fluent one electric current is taken up for the polarization work to supply the necessary energy.
  • the droplets of color from the substrate become polarized attracted and moreover the transfer of color droplets by increasing their volume to those passed by Imprints favored.
  • FIGS. 1A and 1D in connection with FIG. 1C show a two-roll system of a gravure printing unit with a multi-layer impression roller 1 - but here already three-layer according to the invention -, the printing form cylinder 2 and the printing material 4 passed between the two over the deflection roller 3.
  • a rod-shaped voltage electrode 5 extending over its entire length is arranged above the impression roller 1 .
  • the ink squeegee 6 is indicated for stripping excess ink from the printing form cylinder 2.
  • the inking roller and the return, which are not shown, are seated in an ink trough 7 .
  • the voltage electrode 5 is connected to a high voltage source 8 .
  • the outer surface of the three-layer impression roller 1 has a semiconductor layer 10 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, in deviation from the two-roller system described above, 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 on the side 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 current flow within the electrostatic arrangements.
  • a direct voltage U is supplied to the voltage electrode 5 from the high voltage source 8 and the voltage electrode 5 has the internal resistance R 1 .
  • the air gap S existing between the voltage electrode 5 and impression roller 1 - usually in the size of approximately 5 mm to 30 mm - represents the resistor R 2.
  • 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 oversized resistor R 5 .
  • the current flows through the semiconductor layer 10 lying below , which here forms the resistor R 6 , further through the printing material 4, which represents the resistor R 7 .
  • Printing aids where the current is over the impression core is initiated and largely against pollution are protected so that practically no maintenance is given (see e.g. EP-A-0 115 611; company letter of Spengler Electronic AG, Biel-Benken / CH: Electrostatic Printing aid, SR-HELIOFURN 94). These are the most modern to date Printing aids cause a relatively high mechanical Effort with new printing presses from the start equipped with it is still acceptable. When retrofitting older printing presses in operation with encapsulated pressure aids and introduction of the current into the However, the retrofitting effort would be enormous rise, so that the previous printing aids continue to do so used with long, rod-shaped voltage electrodes. (see, for example, the company lettering of SHTNKO Co., Ltd., Osaka / JP: ESAPRINT 21, ELECTROSTATIC ASSIST SYSTEM; Print No .: 97043000).
  • electrostatic Printing aids are known in which a roller electrode is attached a three-layer impression roller with an outer semiconductor layer, an underlying conductor layer and one Insulator layer underneath that on the impression core adjacent, is applied.
  • the roller electrode is in direct electrical contact with an exposed ring surface the conductor layer.
  • a voltage electrode is in the form of an arrangement Brush in direct electrical contact with a semiconductor layer a multi-shift press.
  • DE-U-94 19 540 there is an electrostatic arrangement described in which a voltage electrode at a distance an outer semiconductor layer of a three-layer pressurizer with a high-conductor layer lying under the semiconductor layer and an underlying insulator layer, which is adjacent to the impression core.
  • a voltage electrode at a distance an outer semiconductor layer of a three-layer pressurizer with a high-conductor layer lying under the semiconductor layer and an underlying insulator layer, which is adjacent to the impression core.
  • Sheet metal part, grid or the like trained voltage electrode and the semiconductor layer and the high conductor layer form a capacitor that is used for transmission of AC voltage is suitable.
  • the electrostatic arrangement according to the independent Claim 1 is compared to that in the DE-A-27 09 254 described electrostatic arrangement demarcated.
  • electrostatic printing aids lies the invention based on the task of creating an arrangement where a dirty voltage electrode from one person can be removed, cleaned and re-installed quickly. Or one should quickly counter the soiled voltage electrode a clean electrode can be exchanged for cleaning the dirty electrode externally. service costs and machine downtimes have to be reduced significantly become.
  • the arrangement should be as small as possible with electrodes Dimension, especially for retrofitting printing machines be suitable and the initial procurement costs be kept low. Apply to print quality but still high demands.
  • rod-shaped voltage electrode one such that the outer shell of the press or the Printing cylinder surrounded by a gap in a gap.
  • the homogeneous charge distribution over the entire pressure range is achieved by using the relatively low impedance High conductor layer of the impression cylinder or the printing form cylinder in the axial direction and the high-resistance semiconductor layer reached in the radial direction.
  • Frontal insulation is used to increase safety the impression cylinder or the printing form cylinder against their cores provided by applying an insulation coating that at least from the high conductor layer into the adjacent one Areas of the overlying semiconductor layer and the underlying one Insulator layer extends. Isolation can also by shortening the high-conductor layer on the face side when filling in the resulting from the shortening Free space achieved with the semiconductor or insulator layer become.
  • the three-layer impression roller 1 has a jacket over the impression roller core 13 , which externally consists of a semiconductor layer 10 , an underlying high-conductor layer 11 and an underlying insulator layer 12 adjoining the impression roller core 13 . All three layers 10, 11, 12 extend to 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 color residues. To prevent this, various isolating measures are taken.
  • the high-conductor layer 11 is preferably of 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 insulation is here a shortening of the high-conductor and semiconductor layers 11, 10 set back on both sides and filling of the space created by the shortening with the overlapping insulator layer 12 , which extends up to the outer surface of the semiconductor layer 10 and which intersects the cut edges of both shortened layers 11, 10 surrounds, reached.
  • the external semiconductor layer 10 is shortened from the left end side, so that an annular surface 110 of the high-conductor layer 11 lying under the semiconductor layer 10 is exposed.
  • an insulator coating 14 can also be provided on this end face, which covers the high-conductor layer 11 and the insulator layer 12 underneath and extends to the edge region of the adjacent impression core 13 .
  • the exposed ring surface 110 allows a voltage electrode 5a, 5b, 5c to be attached to it (see the further figures).
  • Emission needles 51 are systematically arranged in a row in an elongated insulation body 50 , for example at a distance of 1 cm.
  • a protective resistor 52 is connected behind each emission needle 51 .
  • Emission needles 51 and protective resistors 52 are advantageously positioned on a printed circuit board which is inserted into the insulating body 50 and is cast, for example, with synthetic resin.
  • the connection contact of the voltage electrode 5 is connected to the high voltage source 8 , so that the voltage U is present.
  • This likewise rod-shaped voltage electrode 5a differs from the embodiment according to FIG. 3A only in that three axially extending rows of emission needles 51 are now provided instead of a row of emission needles 51 . This allows the overall length of the voltage electrode 5a to be further shortened and / or the required high voltage U to be reduced.
  • the number of emission needles 51 can be further reduced for a voltage electrode 5a - here arranged in an approximately square field - and thus the size of the voltage electrode 5a can be further reduced.
  • the emission needles 51 are arranged within a circular area and the insulation body 50 has a cylindrical shape.
  • the rod-shaped voltage electrode 5a which is reduced in length, for example to 1/6 the length of the three-layer impression 1 , is placed in a gravure printing unit on an impression 1 with a gap distance S.
  • the voltage electrode 5a can advantageously be arranged in all positions in a semicircle around the impression roller 1 above the running web of the printing substrate 4 .
  • the arrangement of the voltage electrode 5a below the printing substrate 4 and directed towards the semiconductor layer 10 of the impression roller 1 is also conceivable.
  • the printing material 4 for example damp paper, then acts as a current conductor.
  • the voltage electrode 5a is connected to the high-voltage source 8 , so that a current flows from the voltage electrode 5a through the impression cylinder 1 and the polarization of the color molecules in the cells of the printing form cylinder 2 occurs.
  • the high voltage applied is up to 30 kV DC
  • the air gap S is set at 5 mm to 30 mm, here preferably at 5 mm to 15 mm.
  • 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 with its insulating body 50 extends in an arc over 180 °, with a row of emission needles 51 therein is provided.
  • the voltage electrode 5c will be arranged at least near one end of the impression roller 1 .
  • the length of the arcuate voltage 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 arranged below it (also called inking roller or anilox roller) and the impression cylinder 40 (also called the pressure roller) located at the level of the three-layer printing form cylinder 20 .
  • the web of printing material 4 runs between the three-layer printing form cylinder 20 and the impression cylinder 40 .
  • a shortened rod-shaped voltage electrode 5a is placed on top of the three-layer printing form cylinder 20 with a gap distance S , which acts as a contactless inductor electrode and has, for example, approximately 1/6 the length of the three-layer printing form cylinder 20 .
  • the voltage electrode 5a is preferably located at one end of the three-layer printing form cylinder 20, in order thus to facilitate lateral access for service work.
  • the printing ink is fed to the substrate transfer roller 30 from a scoop roller 60 , which is immersed in the ink tank 7 .
  • the voltage electrode 5a can advantageously be variably arranged in all positions in a semicircle around the three-layer printing form cylinder 20 in the two spaces between the substrate transfer roller 30 and the impression cylinder 40 .
  • the three-layer printing form cylinder 20 externally has the cliché 24 made of semiconductor material, underneath a high-conductor layer 21 and an insulator layer 22 underneath the latter.
  • the insulator layer 22 sits on the inner cylinder core 23 .
  • the voltage electrode 5a is connected to the high voltage source 8 ; a current flows from the three-layer printing form cylinder 20 to the substrate transfer roller 30 on the one hand and to the impression cylinder 40 on the other hand.
  • the electrostatic charge has the effect that the ink particles are better transferred from the substrate transfer roller 30 to the three-layer printing form cylinder 20 , ie its plate 24 , and ultimately to the printing material 4 .
  • State-of-the-art flexographic printing units also dispense with a scoop roller 60 .
  • the printing ink is sprayed onto the substrate transfer roller 30 with a comb doctor 6a ; Excess ink sucks off the squeegee 6a .

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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, 5b, 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, 5b, 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,5b,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 l'électrode de tension (5a,5b,5c)
    f) est disposée avec un interstice d'air (S) à distance de la couche semi-conductrice (10) ; ou
    g) est disposée avec l'interstice d'air (S) à distance d'une surface frontale de la couche semi-conductrice (11) ; ou
    h) est disposée avec l'interstice d'air (S) à distance d'une surface annulaire ouverte (110) de la couche hautement conductrice (11),
    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 rouleau presseur (1), ou
    j) une électrode de tension (5c) s'étendant radialement autour du rouleau presseur (1) présente 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)

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

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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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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
US12083813B2 (en) 2021-10-21 2024-09-10 Viavi Solutions Inc. Printing machine and fixed patterned plate
US12566397B2 (en) 2021-10-21 2026-03-03 Viavi Solutions Inc. Electrostatic printing method
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DE59706583D1 (de) 2002-04-11
ATE213997T1 (de) 2002-03-15
US6578478B2 (en) 2003-06-17
AU5046098A (en) 1998-02-10
ES2173430T3 (es) 2002-10-16
WO1998003049A3 (fr) 1998-10-01
US20030066443A1 (en) 2003-04-10
EP1034078A2 (fr) 2000-09-13
ES2173430T5 (es) 2006-02-16
EP1034078B2 (fr) 2005-08-17
WO1998003049A2 (fr) 1998-01-29

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