EP0970810B1 - Procédé et dispositif pour nettoyer le système de transport d'encre d'une machine à imprimer - Google Patents

Procédé et dispositif pour nettoyer le système de transport d'encre d'une machine à imprimer Download PDF

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Publication number
EP0970810B1
EP0970810B1 EP19980111701 EP98111701A EP0970810B1 EP 0970810 B1 EP0970810 B1 EP 0970810B1 EP 19980111701 EP19980111701 EP 19980111701 EP 98111701 A EP98111701 A EP 98111701A EP 0970810 B1 EP0970810 B1 EP 0970810B1
Authority
EP
European Patent Office
Prior art keywords
chamber
doctor blade
ink chamber
ink
slide
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.)
Expired - Lifetime
Application number
EP19980111701
Other languages
German (de)
English (en)
Other versions
EP0970810A1 (fr
Inventor
Lars Grüter
Wilfried Kolbe
Klaus Schirrich
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.)
Fischer and Krecke GmbH and Co KG
Original Assignee
Fischer and Krecke GmbH and Co KG
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 Fischer and Krecke GmbH and Co KG filed Critical Fischer and Krecke GmbH and Co KG
Priority to ES98111701T priority Critical patent/ES2166122T3/es
Priority to DE59802237T priority patent/DE59802237D1/de
Priority to EP19980111701 priority patent/EP0970810B1/fr
Publication of EP0970810A1 publication Critical patent/EP0970810A1/fr
Application granted granted Critical
Publication of EP0970810B1 publication Critical patent/EP0970810B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices

Definitions

  • the invention relates to a method and a device for cleaning the ink system of a printing press, for example a flexographic printing machine, with an ink chamber, the formed by a chamber doctor blade adjustable to the circumference of an application roller in which the ink chamber is blown out with a gaseous pressure medium becomes.
  • Flexographic printing machines have, for example, one with a roller Cup grid provided with the liquid, with solvent diluted ink is applied to an impression cylinder.
  • the chamber doctor blade is pneumatically operated on the circumference of the application roller turned on so that the ink cups with each rotation of the applicator roller, after applying their ink to the printing parts of the impression cylinder have passed through the paint chamber again with paint be filled.
  • the color system also includes a conveyor a supply pump arranged in a supply line, with which the printing ink is conveyed from a paint container into the chambered doctor blade, and one in one Return line arranged return pump with which the printing ink is made the chambered doctor blade is removed and returned to the ink container becomes. In this way, the printing ink is constantly in during printing circulated in a closed cycle.
  • the same conveyor is used instead the printing ink a cleaning liquid, such as water, soapy water or solvent to pump through the doctor blade to close the ink system rinse and clean.
  • a cleaning liquid such as water, soapy water or solvent
  • EP-A-0 556 460 describes a method according to the preamble of claim 1 known in which the ink chamber and the supply and return lines be blown out with a gaseous pressure medium.
  • the doctor blade is retractable on the applicator roller by means of a fluid cylinder or a ball bushing held.
  • EP-A-0 612 618 describes a printing machine in which the feed and return system for the paint, including the associated pumps, rinsed and then can be ventilated. From EP-A-0 607 574 it is known the rinsing liquid with the help of separate nozzles and the ink chamber.
  • the object of the invention is to provide a more thorough cleaning of the color system enable.
  • This object is achieved in that the doctor blade, the force against the platen during printing is limited is pressed during the blow-out process with increased force in her the applicator roller position is blocked.
  • the chambered doctor blade is usually opened using Pneumatic cylinders with limited pressing force against the circumference of the application roller biased so that on the one hand an adequate seal of the Ink chamber is guaranteed, but on the other hand excessive wear avoided on the doctor blades and seals delimiting the ink chamber becomes.
  • blowing out with high air flow can Form a considerable overpressure in the ink chamber, as this continues downstream pipe system inevitably has a certain flow resistance having.
  • This overpressure in the ink chamber can do this lead that the doctor blade against the force of the pneumatic cylinder of the Applicator roller is pushed away. According to the chamber doctor blade during the blow-out process in its position on the applicator roller blocked, so that despite the overpressure prevailing in the ink chamber the scope of the application roller remains set.
  • the gaseous pressure medium for example compressed air
  • the gaseous pressure medium can therefore be relative high flow rate can be passed through the ink chamber, so that liquid residues that wet the walls of the paint chamber or become recessed collected, are carried away by the air flow. On in this way the liquid residues can be considerably reduced, so that the number of rinses and thus the consumption of solvent can be reduced without impairing the cleaning success.
  • Blowing out with compressed air can occur at various stages in the cleaning process and possibly also take place several times, for example immediately after the Drain the ink after pre-cleaning with a cleaning fluid and after every rinse during the main cleaning.
  • a Blow-out after the last rinsing process can be done in the color system considerably reduce remaining residues of cleaning fluid or solvent, so that when filling with new printing ink an uncontrolled dilution the ink is avoided. This is therefore of particular advantage because the right solvent concentration and therefore the right viscosity the printing ink is a decisive parameter for the print quality.
  • the supply and discharge of the compressed air can be via the supply line and the return line of the color system, so that the entire color system is blown out in one go. In this way, those in the Remove sagging liquid residues from sagging sections of the hoses.
  • a Cleaning fluid with the help of compressed air in the ink chamber or in the whole Color system fogged In this case, the entire color system does not need to be flooded with cleaning liquid, but through the liquid mist only the walls of the paint chamber and possibly the tubes wetted with the cleaning liquid. This allows the use of cleaning fluid still reduce considerably. Part of the sprayed liquid the color system is left through the return line without using touched the walls of the color system. This liquid is practically not contaminated with the paint residues and can be used in one Liquid separators can be recovered so that you get a high purity Receives liquid back. After the liquid is atomized in the color system the paint system is blown out again with "dry" compressed air, so that the heavily contaminated liquid is removed from the system becomes.
  • the compressed air throughput is preferably so high that a turbulent gas flow forms in the color system. This will create a achieved particularly efficient removal of liquid residues. Between the turbulent Gas flow and the liquid that wets the walls of the paint system, there is high friction, with the result that the liquid arrives "creeps" along the walls of the paint system and finally through the return line is dissipated.
  • the applicator roller can be rotated, so that the surface of the applicator roller is thoroughly cleaned and after each Rinsing process is freed of liquid residues.
  • a suitable blocking device for the chamber doctor blade is the subject of the claim 5 and the claims dependent thereon.
  • FIG. 1 and 2 is a side view and an end view, respectively an application roller 10 of a flexographic printing machine is shown.
  • Applicator roller 10 is a chamber doctor blade 12 adjustable, the ink chamber 14th forms.
  • the ink chamber 14 is delimited by doctor blades 16, 18, which doctor the circumference of the rotating applicator roller 10.
  • the applicator roller 10 is in turn on the circumference of a not shown Adjustable printing cylinder and gives the in the printing operation Ink chamber 14 received ink to the printing parts of the Clichés on the impression cylinder.
  • a conveyor 20 is also shown schematically, which is used during printing to be diluted with solvent Ink continuously between the ink chamber 14 of the doctor blade and to circulate a paint container, not shown.
  • Figure 1 shows the color system however during a cleaning process.
  • the paint container replaced by a storage container 22, the used, so already contains cleaning fluid contaminated with printing ink to a certain degree.
  • the conveyor 20 includes a feed line 24 which from the Storage container 22 leads to the ink chamber 14 and contains a feed pump 26, and one returning from the ink chamber 14 to the reservoir 22 Return line 28 with a return pump 30.
  • the feed pump 26 and the return pump 30 are driven by compressed air Diaphragm pumps formed, which with compressed air lines 32, 34 Compressed air can be supplied from a compressed air source, not shown.
  • an expansion tank 36 is connected, which in a known manner to compensate for pressure fluctuations serves the pulsating diaphragm pumps.
  • the feed pump 26 is connected to the associated compressed air line 32 via a metering valve 38 connected to the adjustable delivery rate of this pump is.
  • the delivery rate of the return pump 30 is correspondingly changeable with the aid of a metering valve 40.
  • the supply line 24 and the return line are 28 still connected to the paint container, not shown.
  • the supply line 24 is separated from the paint container, and the color still contained in the color chamber is over the Return line 28 conveyed into the paint container.
  • there is one Pre-cleaning with used cleaning fluid e.g. with solvent, Water or soapy water.
  • the supply line 24 and the return line 28 connected to the reservoir 22, as shown in Fig. 1 in dash-dotted lines.
  • the cleaning fluid is in a closed circuit circulated so that the ink chamber 14 rinsed with the cleaning liquid becomes. Finally, the cleaning liquid is put back into the reservoir 22 is drained and the ink chamber is supplied via the supply line 24 ventilated.
  • the paint system is blown through with compressed air.
  • the supply line 24 is connected to the outlet of a valve 42 (Dashed lines in Fig. 1)
  • the valve 42 is compressed with air from the Compressed air line 32 is fed and preferably contains an adjustable throttle to control the air flow.
  • the return line 28 is also separated from the storage container 22 and via a liquid separator 44 associated with the atmosphere.
  • the pumps 26 and 30 each contain two permeable in the conveying direction Check valves that are in operation with the diaphragm pumps during pump operation open and close. During the blow-out process, the Flow of compressed air through these check valves is not impeded. The Compressed air therefore flows from the outlet of the valve 42 through the entire length the supply line 24, through the ink chamber 14 and through the entire length the return line 28 to the liquid separator 44. In this way the entire color system can be blown out thoroughly.
  • the diaphragm pumps can continue to run, but they can also be switched off become. The liquid residues still contained in the color system are entrained by the compressed air and finally in the liquid separator 44 deposited.
  • the required pressure of the compressed air depends on the flow resistance dependent on the color system and is typically in the On the order of 400 to 600 kPa (4 to 6 bar).
  • a feed pump 46 connects the reservoir 22 or 22 'to the Outlet of the valve 42.
  • the feed pump 46 When the feed pump 46 is in operation, thus Cleaning fluid fed into the compressed air flow and through the compressed air nebulized in the supply line 24.
  • the color system instead of the color system during a rinsing process It is therefore also completely flooded with cleaning liquid possible to clean the cleaning system with a liquid mist that is reflected on the walls of the color system and then through the Compressed air is entrained to the liquid separator 44. In this way the color system can use a much lower amount of cleaning fluid to be cleaned.
  • the supply of the cleaning liquid can possibly also self-priming according to the jet pump principle, so that under certain circumstances, the additional feed pump 46 can be dispensed with can.
  • the cleaning liquid is directly at the outlet of the valve 42 is supplied, it is in modified embodiments also possible, the cleaning liquid or at least part of the same downstream of the feed pump 26 or only immediately before or in the Feed ink chamber 14.
  • the color system is preferably used again blown out with compressed air, without supply of cleaning fluid, so that the refilling with printing ink no residues of cleaning liquid are more contained in the color system.
  • FIG. 2 schematically shows one of two or more pneumatic cylinders 48 shown with which the doctor blade 12 against during the printing operation the scope of the application roller 10 is biased. If during the blowing process a relatively high pressure inside the ink chamber 14 prevails, acts on the relatively large floor area of the ink chamber 14 a force that has the tendency to counteract the doctor blade 12 Force the pneumatic cylinder 48 away from the applicator roller 10. This is in the embodiment shown by one or more blocking devices 50 prevented, which are assigned to the pneumatic cylinders 48.
  • the piston rod 52 of the pneumatic cylinder 48 occurs on the chamber doctor 12 opposite side from the pneumatic cylinder and can with Locked mechanically in one position with the aid of the blocking device 50 be in which the doctor blades 16, 18 rest on the circumference of the applicator roller 10.
  • the blocking device 50 has a guide 54 which is connected to the piston rod 52 forms an angle of approximately 80 ° and in which a slide 56 is guided is.
  • Fig. 2 shows the blocking device in the unlocked state. In this The condition is a bore 58 of the slide 56 with the piston rod 52 aligned so that the free end of the piston rod 52 is not through the Slider 56 is supported. The chamber doctor blade is thus in this state 12 solely by the force of the pneumatic cylinder 48 with the applicator roller 10 kept in investment.
  • the slide 56 has a support surface 60 adjacent to the bore 58, which is perpendicular to the piston rod 52 and consequently with the longitudinal axis the guide 54 forms an angle of approximately 10 °.
  • a pneumatic actuating cylinder 62 is the slide 56 along the guide 54 between the unlocking position shown in FIG. 2 and one shown in FIG. 3 Locking position adjustable. Supports in the locked position the free end of the piston rod 52 on the support surface 60.
  • the actuator cylinder 62 exerts an upward force in FIG. 3 on the slide 56 on, so that the piston rod 52 and the chambered doctor blade 12 by wedge action be pressed against the applicator roller 10.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (9)

  1. Procédé pour le nettoyage du système d'encrage d'une machine à imprimer avec une chambre à encre (14) qui est formée par une racle de chambre (12) pouvant être appliquée contre la périphérie d'un rouleau applicateur (10), procédé dans lequel la chambre à encre (14) est purgée avec un agent de pression gazeux, caractérisé en ce que la racle de chambre (12), laquelle n'est appliquée contre le rouleau applicateur (10) qu'avec une force limitée durant le processus d'impression, est bloquée, durant le processus de purge, avec une force accrue dans sa position de contact avec le rouleau applicateur (10).
  2. Procédé selon la revendication 1, caractérisé en ce qu'une conduite d'amenée (24) reliée à la chambre à encre (14) et une conduite de retour (28) reliée à la chambre à encre sont purgées en même temps que la chambre à encre (14).
  3. Procédé selon la revendication 2, caractérisé en ce qu'on fait aussi circuler l'agent de pression gazeux à travers une pompe (26, 30) implantée sur la conduite d'amenée (24) et/ou sur la conduite de retour (28).
  4. Procédé selon une des revendications précédentes, caractérisé en ce qu'un liquide de nettoyage est nébulisé, à l'aide de l'agent de pression gazeux, dans la chambre à encre (14) et/ou dans la conduite d'amenée ou de retour (24, 28).
  5. Dispositif pour la mise en oeuvre du procédé selon une des revendications précédentes, caractérisé par un dispositif de blocage (50) avec un guide (54), qui s'étend en biais par rapport à la direction selon laquelle la racle de chambre (12) est mobile par rapport au rouleau applicateur (10), et avec un coulisseau (56) qui est guidé et maintenu contre le guide (54) et qui peut se déplacer le long du guide entre une position de verrouillage, dans laquelle il maintient de manière autobloquante un élément structurel (52) relié à la racle de chambre (12), et une position de déverrouillage dans laquelle il libère l'élément structurel (52).
  6. Dispositif selon la revendication 5, caractérisé en ce que le coulisseau (56) comporte une surface de maintien (60) qui forme avec le guide (54) un angle de moins de 30° et contre lequel l'élément structurel (52) prend appui.
  7. Dispositif selon la revendication 6, caractérisé en ce que l'élément structurel (52) relié à la racle de chambre (12) est en forme de barre, et en ce que le coulisseau (56) est pourvu d'un perçage (58) qui débouche dans la surface de maintien (60) et qui, dans la position de déverrouillage, est aligné avec l'élément structurel en forme de barre (52).
  8. Dispositif selon l'une des revendications 5 à 7, caractérisé par un vérin de positionnement pneumatique (62) pour déplacer le coulisseau (56) entre la position de verrouillage et la position de déverrouillage.
  9. Dispositif selon l'une des revendications 5 à 8, caractérisé en ce qu'un vérin pneumatique (48) est prévu pour plaquer la racle de chambre (12) contre le rouleau applicateur (10), et en ce que l'élément structurel maintenu par le coulisseau (56) est l'extrémité libre d'une tige de piston (52) du vérin pneumatique (48).
EP19980111701 1998-06-25 1998-06-25 Procédé et dispositif pour nettoyer le système de transport d'encre d'une machine à imprimer Expired - Lifetime EP0970810B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES98111701T ES2166122T3 (es) 1998-06-25 1998-06-25 Procedimiento y dispositivo para la limpieza del sistema de transporte de tinta de una maquina de imprimir.
DE59802237T DE59802237D1 (de) 1998-06-25 1998-06-25 Verfahren und Vorrichtung zum Reinigen des Farbtransportsystems einer Druckmaschine
EP19980111701 EP0970810B1 (fr) 1998-06-25 1998-06-25 Procédé et dispositif pour nettoyer le système de transport d'encre d'une machine à imprimer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980111701 EP0970810B1 (fr) 1998-06-25 1998-06-25 Procédé et dispositif pour nettoyer le système de transport d'encre d'une machine à imprimer

Publications (2)

Publication Number Publication Date
EP0970810A1 EP0970810A1 (fr) 2000-01-12
EP0970810B1 true EP0970810B1 (fr) 2001-11-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980111701 Expired - Lifetime EP0970810B1 (fr) 1998-06-25 1998-06-25 Procédé et dispositif pour nettoyer le système de transport d'encre d'une machine à imprimer

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EP (1) EP0970810B1 (fr)
DE (1) DE59802237D1 (fr)
ES (1) ES2166122T3 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1197333B1 (fr) 2000-10-13 2006-03-01 Fischer & Krecke GmbH & Co. Machine d'impression flexographique avec un dispositif de nettoyage pour le cylindre d'impression
DE10133349B4 (de) * 2001-07-15 2006-04-06 Harald Janzen Vierkammer-Membranpumpe
DE20302462U1 (de) * 2003-02-15 2003-04-17 MAN Roland Druckmaschinen AG, 63075 Offenbach Waschvorrichtung für Druck- und/oder Beschichtungswerke in einer Verarbeitungsmaschine
ES2606783T3 (es) * 2005-09-13 2017-03-27 Bobst Mex Sa Instalación para el cambio de tinta en una estación de impresión de una impresora flexográfica
JP5529497B2 (ja) * 2009-11-05 2014-06-25 三菱重工印刷紙工機械株式会社 フレキソ印刷機のインキ洗浄方法及び装置
EP2620285B1 (fr) * 2012-01-25 2019-11-13 Bobst Bielefeld GmbH Système de nettoyage pour chambre d'encre
CN103625110A (zh) * 2013-11-21 2014-03-12 山东沃源新型面料股份有限公司 圆网印花机刮刀清洁装置
PL2933103T3 (pl) * 2014-04-14 2018-12-31 Mayr-Melnhof Karton Ag Sposób czyszczenia urządzenia do nakładania farby i urządzenie do nakładania farby

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5003876A (en) * 1989-02-10 1991-04-02 The Ward Machinery Company Printing apparatus with dual inking system
US5184556A (en) * 1992-02-18 1993-02-09 Paper Converting Machine Company Printing apparatus and method
US5410961A (en) * 1992-12-30 1995-05-02 Fit Group, Inc. Fountain assembly
US5367982A (en) * 1993-02-25 1994-11-29 Howard W. DeMoore Automatic coating circulation and wash-up system for printing presses
DE19516456C2 (de) * 1995-05-04 1999-04-15 Windmoeller & Hoelscher Vorrichtung zur Reinigung einer Rakelvorrichtung für ein Spülfarbwerk einer Rotationsdruckmaschine
DE19536268C1 (de) * 1995-09-28 1997-02-06 Windmoeller & Hoelscher Rakelvorrichtung für ein Spülfarbwerk einer Rotationsdruckmaschine

Also Published As

Publication number Publication date
DE59802237D1 (de) 2002-01-10
ES2166122T3 (es) 2002-04-01
EP0970810A1 (fr) 2000-01-12

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