EP2933103B1 - Verfahren zum Reinigen einer Farbauftragsvorrichtung und Farbauftragsvorrichtung - Google Patents

Verfahren zum Reinigen einer Farbauftragsvorrichtung und Farbauftragsvorrichtung Download PDF

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Publication number
EP2933103B1
EP2933103B1 EP14164622.4A EP14164622A EP2933103B1 EP 2933103 B1 EP2933103 B1 EP 2933103B1 EP 14164622 A EP14164622 A EP 14164622A EP 2933103 B1 EP2933103 B1 EP 2933103B1
Authority
EP
European Patent Office
Prior art keywords
paint
applying device
doctor blade
paint applying
blade beam
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.)
Not-in-force
Application number
EP14164622.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2933103A1 (de
Inventor
Udo WISSING
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.)
Mayr Melnhof Karton AG
Original Assignee
Mayr Melnhof Karton AG
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 Mayr Melnhof Karton AG filed Critical Mayr Melnhof Karton AG
Priority to EP14164622.4A priority Critical patent/EP2933103B1/de
Priority to PL14164622T priority patent/PL2933103T3/pl
Publication of EP2933103A1 publication Critical patent/EP2933103A1/de
Application granted granted Critical
Publication of EP2933103B1 publication Critical patent/EP2933103B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/008—Cleaning arrangements or devices for doctor blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing
    • 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
    • B41P2235/30—Recovering used solvents or residues
    • B41P2235/31—Recovering used solvents or residues by filtering

Definitions

  • the invention relates to a method for cleaning a paint application device. This can for example be designed as part of a printing device for applying colored print on packaging material. Furthermore, the invention relates to a paint application device for applying paint to a medium, such as a printing roller or a cliché.
  • squeegee bars or squeegee chambers in order to apply ink to a rotating, so-called anilox roller.
  • the applied color is in turn transferred from the anilox roller to a plate cylinder rotating in opposite directions to the anilox roller, which has a particularly soft surface.
  • the ink applied to the plate cylinder is applied to a substrate which is moved in accordance with a rotation of a printing cylinder (hard surface) leading to the substrate.
  • the plate cylinder and the printing cylinder rotate in opposite directions to each other, wherein the substrate is clamped for applying the ink between the plate cylinder and the impression cylinder.
  • the substrate corresponds to a substrate, such as paper, cardboard, foil, sheet, textiles or other printable materials.
  • an inking device to which the doctor bar or the doctor chamber belongs, from time to time to clean and accordingly, for example Residues such as dried paint, water (eg condensation water) or operational abrasion.
  • the invention has for its object to enable a particularly thorough cleaning of a paint application device of the type mentioned.
  • the color residues include, for example, dried paint or old paint, which may be located in so-called dead water zones.
  • condensation residues or solvent residues are to be counted among the liquid residues, and the soil residues are formed, for example, by wear residues such as, for example, metallic abrasion of moving components of the paint application device.
  • the blown paint can be recycled and thus the Coloring device can be supplied in a subsequent printing process as a consumable for application to the medium.
  • the inking device not rinse with ink to clean the inking apparatus, but it even picks up the ink ejected from the inking apparatus to use for subsequent printing of the inking apparatus.
  • the supply lines or return lines are opened by re-switching the inlet valve or return valve after blowing and the entire inking device (including the doctor blade) by feeding of cleaning fluid flushed out through the port or other suitable opening.
  • cleaning liquid for example, a special paint remover or - depending on the nature of the color or the residues - also normal water in question, which is pumped through the paint application device.
  • the rinsing of the doctor blade bar by means of the cleaning liquid is significantly less critical in terms of the emergence of color from the respective openings of the doctor blade as the exposure of the doctor blade with compressed air, as even under low pressure of the cleaning liquid a particularly far-reaching cleaning effect, eg. B. can be achieved by the cleaning liquid as a result of the action or softening of the residues.
  • a shut-off valve of the paint application device is switched over, and a supply line for supplying the inking device with ink is closed upstream of the connection opening.
  • This pump may be, for example, a flow pump, which is used in normal printing operation or printing process for conveying color to the doctor bar.
  • This pump is particularly well suited for conveying the cleaning liquid through the paint application device (including the squeegee), since the pump capacity, or the delivery pressure of this pump is already set to a maximum allowable fluid pressure within the paint application device, and accordingly no further action required are to press out the color from the doctor blade as a result of the application of the cleaning liquid prevention.
  • a particularly effective cleaning of the paint application device including the doctor blade bar is achieved by pumping the cleaning fluid by means of the pump, without the need for costly measures to prevent the escape of paint or cleaning fluid from respective openings of the doctor blade.
  • the ink is conveyed into a paint container of the inking device and made available for reuse in a printing operation of the inking device.
  • a paint container for example, a paint bucket or other suitable container can be used, in which the blown paint is collected.
  • the collected paint can be cleaned, for example, by a filter, upon introduction of the blown paint from the paint container into the supply container.
  • the color and / or liquid and / or dirt residues by a separator of the paint application device downstream of the doctor blade in a first residue part, which is supplied to the ink container, and in a second residue part, which is fed to a residue container , separated.
  • a separator for example, a liquid separator can be used, in which the residues or residues of the cleaning liquid, eg. as a result of their different density to the color, be deposited by the color. It is clear that the gravitational separation, which is thus caused by density differences, is only one of several possibilities of deposition. Such a separator allows a particularly automated separation of the usable color of residues to be disposed of or residues of the cleaning liquid.
  • a discharge line can be closed, via which the paint flowing back from the doctor bar during normal printing operation or printing operation (eg excess paint) is returned to the ink fountain or supply tank for reuse.
  • the ink fountain serves as a reservoir for providing the paint for the paint application device. While recycling is desired in the normal printing process, it is not desired during cleaning.
  • an influx of residues or residues of the cleaning liquid can be effectively prevented in the ink fountain.
  • a supply of the residues or the cleaning liquid to the separator allows and thus effectively avoided any contamination or dilution of the color contained in the ink fountain.
  • the auxiliary pump may for example be designed as a return pump, which is used in the normal printing operation or printing for sucking excess paint from the doctor bar.
  • this auxiliary pump is not only suitable for conveying the paint, but also the cleaning liquid.
  • the inking device upstream of the inlet valve and downstream of the connection opening to a pump, by means of which the doctor bar color or the cleaning liquid can be supplied.
  • the pump may for example be designed as a positive displacement pump, which particularly effectively prevents a backflow of the paint or the cleaning liquid.
  • This pump allows a particularly uniform feeding and, accordingly, a particularly uniform volume flow of the ink or the cleaning liquid, whereby components of the inking device, such as the doctor bar, can be particularly uniformly pressurized, and are accordingly exposed to life-shortening pressure fluctuations and the amount of ink application remains constant so that an over or under dosage of color is effectively prevented.
  • the paint application device has a shut-off valve upstream of the connection opening, by means of which a supply line, via which paint can be supplied to the paint application device, can be closed.
  • This check valve not only prevents backflow of cleaning fluid when cleaning the paint application device, but can also be used to minimize the amount of air sucked by the pump, if the pump z. B. was removed as a result of maintenance from the paint application device, or replaced by a new pump.
  • closing the supply line by means of the check valve prior to removal of the pump allows the paint remaining in the supply line to be held against gravity in a particularly efficient manner, thereby minimizing the amount of intake air when the pump is restarted can be reduced.
  • This contributes in a particularly efficient way to the longevity of the pump, in addition, an influx of air is avoided in the doctor bar. This would affect the print quality, eg as a result of blistering when applied to the medium (eg an anilox roller).
  • a further advantage is when the paint application device downstream of the squeegee bar has a separation valve, by means of which the color and / or liquid and / or dirt residues can be fed to a separator of the paint application device, and by means of which a drain line, via which color downstream of the squeegee a color box the paint application device is fed, can be closed.
  • the separation valve By means of the separation valve can be prevented in a particularly effective manner leakage or spilling of the paint when, for example, the paint application device is rinsed with the cleaning liquid, or if the ink fountain itself is subjected to cleaning, or is replaced by a new ink fountain.
  • the Abscheideventils a particularly long dripping of the paint from the drain line can be particularly effectively shortened and accordingly a spill of paint when exchanging the ink fountain are prevented.
  • the paint application device has an additional pump downstream of the doctor blade bar, by means of which ink or the cleaning liquid can be sucked out of the doctor blade beam.
  • the promotion of the color or the cleaning liquid can be carried out particularly effectively by the paint application device, in particular if respective lines of the paint application device are already heavily contaminated and accordingly have a narrowed cross-section.
  • An associated increased flow resistance of the paint application device can accordingly be counteracted particularly effectively by means of the auxiliary pump.
  • doctor bar has at least one ventilation opening.
  • an overloading of the pumps of the paint application device can be particularly effectively prevented, provided that respective connecting lines between the squeegee bar and the pumps due to heavy contamination have increased flow resistance. Furthermore, by means of the ventilation opening, a vacuum application of the doctor blade bar z. B. prevented by the auxiliary pump, thereby avoiding that it comes to a deterioration of the paint on the medium by the doctor bar.
  • the paint application device is designed as part of a flexographic printing press.
  • Flexographic printing machines have a particularly simple printing unit structure and are particularly well suited to use low-viscosity printing inks. These low-viscosity inks can be conveyed through the inking device with a particularly low pumping capacity, as a result of which the inking device as part of a flexographic printing press is particularly efficient and accordingly can be operated with particularly low energy requirements.
  • the figure shows a schematic structure of an embodiment of the paint application device according to the invention, which can be cleaned very efficiently.
  • the figure shows a schematic representation of individual components of a paint application device 10, which is presently designed as part of a flexographic printing machine.
  • the illustrated embodiment of the inking device 10 is used for applying ink 26 to a medium which may correspond to a pressure roller or a cliché.
  • the ink 26 is distributed on the medium by means of a doctor bar 12 of the paint application device 10.
  • a doctor bar 12 of the paint application device 10 In order to supply the doctor bar 12 with ink 26, it is sucked from a paint box 48 of the paint application device 10 in accordance with a direction indicated by an arrow flow direction 56 via a supply line 32 by means of a pump 34 from the ink fountain 48.
  • the pump 34 is designed as a so-called flow pump.
  • the pump 34 conveys the paint 26 via a supply line 16 to an inlet opening 58 of the doctor blade 12, wherein the color 26 is distributed after its entry via the inlet opening 58 in the doctor bar 12.
  • a uniform application or distribution of the ink 26 on the medium can take place by means of the doctor bar 12.
  • To opposite sides of the doctor bar 12 has these respective outlet openings 60, which are coupled to respective return lines 20.
  • the return lines 20 are in turn fluidly coupled to an auxiliary pump 50 which is presently designed as a return pump and by means of which the excess color 26 can be sucked via the return lines 20 from the doctor bar 12.
  • the excess paint 26 can be returned in turn via a drain line 52 into the ink fountain 48.
  • the squeegee bar 12 In order to prevent the auxiliary pump 50, the squeegee bar 12 applied during vacuuming of the paint 26 with a vacuum, the squeegee bar 12 also has respective ventilation openings 54, via which air to avoid Vacuum structure can be sucked into the blade bar 12.
  • the doctor bar 12 In a normal printing operation, therefore, the doctor bar 12 is supplied with the ink 26 from the ink fountain 48 by means of the pump 34 located upstream of the doctor bar 12 and the excess ink 26 is conveyed from the doctor bar 12 back into the ink fountain 48 by means of the auxiliary pump 50 arranged downstream of the doctor bar 12 ,
  • the paint application device 10 shown in the figure can be cleaned in a particularly thorough cleaning process, in which color and / or liquid and / or dirt residues, which are to be referred to as residues 24 below, can be removed particularly largely from the paint application device.
  • the feed line 16 is closed to the doctor bar 12 by switching an inlet valve 14 of the paint application device 10.
  • the inlet valve 14 By means of the inlet valve 14, the supply line 16 downstream of the pump 34 and upstream of the doctor blade bar 12 is closed.
  • the return lines 20 are closed by switching respective return valves 18 of the paint application device 10. In other words, therefore, by closing the supply line 16 by means of the inlet valve 14 and by closing the return lines 20 by means of the respective return valves 18, both the inflow and the outflow of color from the doctor bar 12 is initially prevented, whereby the color during operation of the pump 34 and additionally or alternatively the auxiliary pump 50 is conveyed according to the dashed line shown by the applicator 10 and thereby the doctor bar 12 is bypassed accordingly.
  • the valves used can preferably be designed as 3-way valves. After closing the feed line 16 and the return lines 20, the residues 24 are blown out with compressed air, which is supplied to the paint application device 10 upstream of the doctor blade 12 and upstream of the pump 34 via a connection opening 28 of the paint application device 10.
  • a check valve 30 is the Paint application device 10 is switched, while the supply line 32 for supplying the paint application device 10 closed with ink 26 upstream of the connection opening 28.
  • a separation valve 46 is closed before the blowing, which prevents the influx of the blown-out paint 26, and a portion of the residues 24 via a drain line 52 into the ink fountain 48.
  • the paint container 38 may be suitable for example a screen, filter or others Contain separation means by which the color 26 can be separated from the residues 24.
  • the inlet valve 14 and the two return valves 18 are opened again, whereby a fluid flow to the squeegee bar 12 or the squeegee bar 12 is accordingly made possible via the feed line or the return lines 20.
  • the check valve 30 remains closed.
  • the separation valve 46 remains closed, by means of which the drainage line 52 to the ink fountain 48 was already closed during the blowing out.
  • the residues 24 are now flushed out by applying the paint application device 10 with a cleaning liquid 22 fed via the connection opening 28.
  • the cleaning liquid 22 can be fed to the paint application device 10 via the connection opening 28 on the one hand and with a certain pressure at standstill Pump 34 or additional pump 50 flow through the paint application device 10, and on the other hand are conveyed by the paint application device 10 by means of the pump 34 and the auxiliary pump 50, similar to the color 26 in the printing operation.
  • the first residue portion 40 (the paint 26 deposited by the separator 38) may be returned from the ink container 36 to the ink fountain 48 and thus used for another printing operation.
  • the second residue part 42 is composed, for example, of wastewater or dirty cleaning liquid 22, which may contain, for example, condensation residues or wear residues, such as, for example, abrasion.
  • the first residue portion 40 may be reused as the color 26 in a further printing operation, the second residue portion 42 is to be disposed of.

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  • Coating Apparatus (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP14164622.4A 2014-04-14 2014-04-14 Verfahren zum Reinigen einer Farbauftragsvorrichtung und Farbauftragsvorrichtung Not-in-force EP2933103B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14164622.4A EP2933103B1 (de) 2014-04-14 2014-04-14 Verfahren zum Reinigen einer Farbauftragsvorrichtung und Farbauftragsvorrichtung
PL14164622T PL2933103T3 (pl) 2014-04-14 2014-04-14 Sposób czyszczenia urządzenia do nakładania farby i urządzenie do nakładania farby

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14164622.4A EP2933103B1 (de) 2014-04-14 2014-04-14 Verfahren zum Reinigen einer Farbauftragsvorrichtung und Farbauftragsvorrichtung

Publications (2)

Publication Number Publication Date
EP2933103A1 EP2933103A1 (de) 2015-10-21
EP2933103B1 true EP2933103B1 (de) 2018-08-01

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ID=50478758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14164622.4A Not-in-force EP2933103B1 (de) 2014-04-14 2014-04-14 Verfahren zum Reinigen einer Farbauftragsvorrichtung und Farbauftragsvorrichtung

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Country Link
EP (1) EP2933103B1 (pl)
PL (1) PL2933103T3 (pl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113352749A (zh) * 2021-06-16 2021-09-07 陕西北人印刷机械有限责任公司 一种ci柔性版印刷设备清洗墨路控制方法
CN113815300B (zh) * 2021-10-15 2022-07-19 深圳市至臻精密股份有限公司 一种半导体制备用弧面丝网印刷机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0970810B1 (de) * 1998-06-25 2001-11-28 Fischer & Krecke Gmbh & Co. Verfahren und Vorrichtung zum Reinigen des Farbtransportsystems einer Druckmaschine
ITGE20020033A1 (it) * 2002-04-24 2003-10-24 Schiavi Spa Metodo di lavaggio automatico del circuito di inchiostrazione nelle macchine da stampa rotative, ed impianto per l'attuazione di detto metod
EP1762390B1 (fr) * 2005-09-13 2016-11-30 Bobst Mex Sa Installation pour le changement de l'encre dans une station d'impression d'une imprimeuse flexographique

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PL2933103T3 (pl) 2018-12-31
EP2933103A1 (de) 2015-10-21

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