WO2017207577A1 - Dispositif et procédé pour nettoyer un cylindre de contre-pression central d'une machine d'impression flexographique - Google Patents

Dispositif et procédé pour nettoyer un cylindre de contre-pression central d'une machine d'impression flexographique Download PDF

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Publication number
WO2017207577A1
WO2017207577A1 PCT/EP2017/063048 EP2017063048W WO2017207577A1 WO 2017207577 A1 WO2017207577 A1 WO 2017207577A1 EP 2017063048 W EP2017063048 W EP 2017063048W WO 2017207577 A1 WO2017207577 A1 WO 2017207577A1
Authority
WO
WIPO (PCT)
Prior art keywords
impression cylinder
nozzle
carbon dioxide
cleaning
printing material
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.)
Ceased
Application number
PCT/EP2017/063048
Other languages
German (de)
English (en)
Inventor
Adrian SCHÜTTE
Uwe Rogge
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher 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 Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Priority to EP17730694.1A priority Critical patent/EP3463891B1/fr
Priority to ES17730694T priority patent/ES2801474T3/es
Publication of WO2017207577A1 publication Critical patent/WO2017207577A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/006—Cleaning arrangements or devices for impression cylinders
    • 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
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/26—Spraying devices
    • 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
    • B41P2235/50—Selection of materials or products for cleaning

Definitions

  • the invention relates to a device and a method for cleaning a central impression cylinder of a flexographic printing press according to the preambles of claims 1 and 7.
  • the object of the present invention is therefore to propose a device and a method for cleaning a central impression cylinder of a flexographic printing press, with which the disadvantages described above can be avoided.
  • At least one nozzle is provided, from which gaseous and / or liquid carbon dioxide can be led out in an exit direction, wherein the exit direction is directed to the impression cylinder and wherein the nozzle - seen in the direction of rotation of the impression cylinder - between the line of contact of a printing material and the Abletteline the substrate web is arranged.
  • the nozzle serves to provide a constriction in the direction of movement of the carbon dioxide in order to accelerate the carbon dioxide molecules.
  • the carbon dioxide is already passed through the nozzle at a pressure which is higher than the ambient pressure.
  • An acceleration causes the carbon dioxide to expand, at least in part, after leaving the nozzle, where it passes directly from the gaseous or liquid phase into the solid phase, ie, resublimates or solidifies. These solid particles are now able to lift, reduce or soften the contamination from the central impression cylinder, so that in an optional further step, if necessary, the contaminants can be removed.
  • the nozzle causes the jet containing the carbon dioxide to be directed onto the impression cylinder.
  • the often occurring sublimation effects can enhance the cleaning effect.
  • the particles pass through the phase transition from solid to liquid, which is associated in particular with an increase in volume of the particle in question. Due to the increase in volume, an additional pressure surge is caused, which may also be useful for the dissolution of dirt particles.
  • this nozzle and the necessary supply and / or discharge lines build small. Therefore, the invention provides that this nozzle - seen in the direction of rotation of the impression cylinder - is arranged between the line of contact of the printing substrate and the release line of the printing material. It is therefore not necessary to remove the printing material web for cleaning at least areas of the central impression cylinder.
  • the substrate web is printed when it rests on the impression cylinder.
  • the printing material web is laid on the impression cylinder by means of a roller or roller, frequently referred to as a pressure roller.
  • the printing material web can now pass one or more printing units until it is lifted along a separation line from the impression cylinder.
  • a guide roller is provided, which, however, does not form a common nip with the impression cylinder.
  • the wrap angle of the printing material web is often at least 270 degrees, in particular at least 300 degrees.
  • the state of matter of the solid carbon dioxide will change again in gaseous form within a short time, either directly or via the liquid phase.
  • the carbon dioxide can be led out of the nozzle by means of a carrier fluid, in particular by means of a carrier gas.
  • a carrier gas normal air can be used.
  • the carrier gas is under high pressure and is thereby guided at high speed through the nozzle.
  • the carbon dioxide must be added in this case only before passing through the nozzle, with a slight overpressure is sufficient.
  • the carrier gas is under a pressure of at least 5 bar, preferably at least 6 bar.
  • the already often existing compressed air connections can be used to provide the pressurized carrier gas.
  • a suction device is provided with which the carbon dioxide and / or dirt particles are removable.
  • this suction device may comprise a suction nozzle, which is arranged in the vicinity of the above-mentioned nozzle, in order to be able to carry out the suction even where it is necessary.
  • the suction nozzle between the line of contact and the release line of the printing material web is arranged
  • the nozzles have an oval or round outlet cross-section. Even rectangular cross sections can be beneficial.
  • the outlet cross-section preferably has a diameter or a side length of at least 1 mm and at most 100 mm. In this way, a good cleaning effect can be achieved because both in the direction of rotation of the impression cylinder as well as across a sufficiently large irradiation area is achieved. It is also advantageous if the outlet of the nozzle has a distance of at least 10 mm, in particular of at least 20 mm from the surface of the impression cylinder, measured in the direction of the main axis of the nozzle. The distance of the nozzle from the surface of the impression cylinder, however, should not exceed 100 mm, preferably not 80 mm.
  • the main axis of the nozzle and the surface of the impression cylinder occupy an angle of 45 degrees to 135 degrees to each other.
  • the nozzle radiates perpendicular to the impression cylinder or with a deviation of up to 45 degrees from the vertical direction.
  • a particularly good cleaning effect can be achieved because then the carbon dioxide is concentrated on a comparatively small area.
  • the main axis of the nozzle is inclined counter to the direction of rotation of the impression cylinder.
  • the nozzle is movable, in particular displaceable, arranged on a linear axis, which extends transversely to the transport direction of the impression cylinder.
  • the nozzle is arranged on a carriage and that the traverse is designed as a rail. It may be advantageous if the nozzle is motor-driven by means of a drive device.
  • a single nozzle or a small number of nozzles can be provided, which are selectively movable to positions at which contaminants are to be removed. This can be achieved with a cost-effective device for cleaning a central impression cylinder of a flexographic printing press sufficient cleaning.
  • the nozzle it is particularly preferred to position the nozzle at the extension of the side edges of the printing material web during a running print job.
  • the current print job it can happen again and again that splashes of ink impinge on the impression cylinder in the region of the edge of the printing material web.
  • the proportion of these splashes which is not taken through the printing material, adheres to the impression cylinder and could lead to problems in the long run. Therefore, it is advantageous to continuously or intermittently clean the region of the side edges of the printing material web by the measure mentioned during the current print job.
  • the provision of at least two nozzles can be advantageous in this connection in order to be able to assign a nozzle to each side edge of the printing material web. An immediate removal of dirt is then possible without first having to move a single nozzle.
  • a printing press which comprises a device for detecting the side edges of the printing material, to pass on the information about the position of the side edges to a control device which controls the drive device for positioning the nozzle transversely to the impression cylinder.
  • This automation can be created with which the areas of the side edges on the impression cylinder are automatically cleaned.
  • a sensor device with which contaminants can be detected.
  • an electromagnetic radiation such as visible light
  • the intensity of the reflected light can now be measured, in particular the spectral intensity.
  • the cleaning device can be controlled in particular with regard to the position as well as with regard to the cleaning intensity.
  • the sensor device, as described above, and the nozzle itself, at least transversely to the impression cylinder is movable, so that the sensor position is adjustable, so that the points of supposedly largest contamination can be examined.
  • the sensor device also be adjusted in terms of their position by the means for detecting the side edge of the printing substrate.
  • the said control device can also cope with this task.
  • a sensor device can be used while the printing presses continuously print the printing material web (so-called continuous printing). In this case, it can be cleaned as needed at a detected pollution, which reduces the use of consumables.
  • the present invention although described with respect to a central cylinder flexographic printing machine, can also be used in an in-line printing unit, which is also preferably configured as a flexographic printing unit, or in a gravure printing unit.
  • the impression cylinder of a gravure printing unit is usually referred to as impression roller.
  • Other cylinders of a printing press can also be cleaned with the present invention.
  • the pressure roller is called, which is in contact with the impression cylinder and therefore is particularly susceptible to contamination.
  • FIG. 1 side view of a flexographic printing machine with the cleaning device according to the invention
  • FIG. 2 detail of Figure 1 with further details of the Device according to the invention.
  • FIG. 1 shows a flexographic printing machine 100 with a central impression cylinder 101, via which a printing material web 102 can be guided.
  • the printing material web 102 is preferably initially guided over at least one guide roller 103 in the transport direction T. This is followed by a pressure roller 104, with which the printing substrate 102 is pressed onto the peripheral surface of the impression cylinder 101.
  • the counter-pressure cylinder 101 rotates in the direction R, so that the printing material web is guided past a plurality of - shown are four - inking units 105, 105 ', 105 "and 105"'.
  • such an inking unit 105 comprises a format cylinder 106 which carries the print motif.
  • the necessary printing ink is applied by the inking roller 107, usually an anilox roller, to the printing motif of the format cylinder 106, which in turn applies this printing ink to the printing substrate 102 in an appropriate manner.
  • Each inking unit usually prints with a different color.
  • the area between this common tangent and the pressure roller 104 is the web-free area represented by the double arrow 110.
  • a nozzle 120 is arranged according to the invention explained throughout the description.
  • FIG. 2 now shows further details for cleaning the impression cylinder 101, which rotates in the direction R.
  • the printing material web 102 is shown, which can be placed on the impression cylinder 102 by means of a pressure or pressure roller 104.
  • the release line of the printing material web of the impression cylinder is not shown in this figure.
  • the nozzle 120 receives via a supply line 121, which may be configured for example as a tube, the carbon dioxide and / or the carrier fluid. Due to the narrowing in the flow direction of the gas or the carrier fluid cross-section of the nozzle, the carbon dioxide is accelerated in the direction of arrow 122 placed on the impression cylinder to solve soiling.
  • the nozzle 120 is arranged on a carrier 132, preferably via a rotary joint 133.
  • a hinge may allow angular adjustment of the nozzle 120 and thus the direction 122 relative to the impression cylinder.
  • the carrier is preferably mounted on a carriage 130, which can be moved along the linear axis 131.
  • the linear axis preferably extends parallel to the axis of rotation of the counter-pressure cylinder and may be fastened, for example, to the machine frame, not shown, of the printing press.
  • linear axis and slide can be designed as a linear motor.
  • a position sensor can be provided, via which the transverse position of the nozzle can be determined.
  • a position sensor is important in connection with an automatic cleaning function.
  • at least one contamination sensor which is not shown, may be provided in order to be able to determine contamination of the impression cylinder.
  • a control device which receives a contamination signal from the pollution sensor, the nozzle can now be positioned by displacement of the carriage relative to the pollution.
  • FIG. 2 additionally shows a suction device 140 with which, in particular, the particles of contamination dissolved by the counter-pressure cylinder can be reliably sucked away from the surroundings of the impression cylinder, which is shown by the arrow 141.
  • the suction device Via the line 142, the suction device may be connected to a vacuum source.
  • the suction device 140 may extend in the transverse direction over the entire width of the impression cylinder. Alternatively, it may be made smaller so that it substantially covers an area that also reaches the carbon dioxide exiting the nozzle. In this case it can be provided that the suction device is also connected via holding elements with the carriage 130 in order to allow a simultaneous displacement with the nozzle 120.

Landscapes

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

Abstract

L'invention concerne un dispositif pour nettoyer au moins certaines zones d'un cylindre de contre-pression (101) central d'une machine d'impression flexographique (100), caractérisé en ce qu'il présente au moins une buse (120) à partir de laquelle du dioxyde de carbone gazeux et/ou liquide peut être guidé dans une direction de sortie orientée vers le cylindre de contre-pression (101), ladite buse étant disposée, vue dans le sens de rotation du cylindre de contre-pression (101), entre la ligne de séparation d'une bande de matériau à imprimer (102) et la ligne de contact de la bande de matériau à imprimer.
PCT/EP2017/063048 2016-05-30 2017-05-30 Dispositif et procédé pour nettoyer un cylindre de contre-pression central d'une machine d'impression flexographique Ceased WO2017207577A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17730694.1A EP3463891B1 (fr) 2016-05-30 2017-05-30 Dispositif et procédé pour nettoyer un cylindre de contre-pression central d'une machine d'impression flexographique
ES17730694T ES2801474T3 (es) 2016-05-30 2017-05-30 Dispositivo y un procedimiento para la limpieza de un cilindro de contrapresión central de una máquina de impresión flexográfica

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016209352 2016-05-30
DE102016209352.5 2016-05-30

Publications (1)

Publication Number Publication Date
WO2017207577A1 true WO2017207577A1 (fr) 2017-12-07

Family

ID=59070609

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/063048 Ceased WO2017207577A1 (fr) 2016-05-30 2017-05-30 Dispositif et procédé pour nettoyer un cylindre de contre-pression central d'une machine d'impression flexographique

Country Status (3)

Country Link
EP (1) EP3463891B1 (fr)
ES (1) ES2801474T3 (fr)
WO (1) WO2017207577A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991012137A1 (fr) * 1990-02-13 1991-08-22 Baldwin Technology Corporation Nettoyage au dioxyde de carbone d'equipement d'arts graphiques
EP0544126A2 (fr) * 1991-11-21 1993-06-02 WindmÀ¶ller & Hölscher Machine d'impression
US20050132913A1 (en) * 2003-12-19 2005-06-23 Man Roland Druckmaschinen Ag Apparatus for cleaning rolls, cylinders and printing forms
EP2537678A1 (fr) * 2011-06-20 2012-12-26 Christian Fappiano Appareil de nettoyage pour le nettoyage des cylindres rotatifs d'une machine d'impression

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991012137A1 (fr) * 1990-02-13 1991-08-22 Baldwin Technology Corporation Nettoyage au dioxyde de carbone d'equipement d'arts graphiques
EP0544126A2 (fr) * 1991-11-21 1993-06-02 WindmÀ¶ller & Hölscher Machine d'impression
US20050132913A1 (en) * 2003-12-19 2005-06-23 Man Roland Druckmaschinen Ag Apparatus for cleaning rolls, cylinders and printing forms
EP2537678A1 (fr) * 2011-06-20 2012-12-26 Christian Fappiano Appareil de nettoyage pour le nettoyage des cylindres rotatifs d'une machine d'impression

Also Published As

Publication number Publication date
EP3463891B1 (fr) 2020-05-20
EP3463891A1 (fr) 2019-04-10
ES2801474T3 (es) 2021-01-11

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