EP0180541B1 - Method and device for cleaning a printing form - Google Patents

Method and device for cleaning a printing form Download PDF

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Publication number
EP0180541B1
EP0180541B1 EP85810469A EP85810469A EP0180541B1 EP 0180541 B1 EP0180541 B1 EP 0180541B1 EP 85810469 A EP85810469 A EP 85810469A EP 85810469 A EP85810469 A EP 85810469A EP 0180541 B1 EP0180541 B1 EP 0180541B1
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EP
European Patent Office
Prior art keywords
nozzle
pressure
printing
filter
pump
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Expired
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EP85810469A
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German (de)
French (fr)
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EP0180541A1 (en
Inventor
Hanspeter Schneebeli
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H Schneebeli & Coag
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H Schneebeli & Coag
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Priority to AT85810469T priority Critical patent/ATE47690T1/en
Publication of EP0180541A1 publication Critical patent/EP0180541A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/001—Devices for cleaning parts removed from the printing machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/02—Cleaning arrangements or devices for forme cylinders
    • 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

  • Printing forms e.g. B. printing cylinder
  • cleaned with solvents by spraying the printing form in a cleaning booth over a perforated tube with the solvent.
  • the ink residues on the printing form are at least partially dissolved in the solvent.
  • the dissolved color residues accumulate in the solvent, so that it has to be replaced relatively often.
  • the contaminated solvent is difficult to remove in an environmentally friendly manner. It is also very expensive to use the solvent in a closed circuit because the dissolved paint residues are difficult to chemically separate from the solvent.
  • contact with the solvent and its vapors endangers the operating personnel.
  • a device is known from FR-A 1 249140: A flat printing form is attached to a pivotable table and pivoted into a vertical position. To clean the printing form, you drive along a carriage with a rotating, roller-shaped brush and two rows of spray nozzles. First, a solvent is sprayed onto the printing form via the row of spray nozzles. With the help of the brush, the color residues are solved. The printing plate is then rinsed with fresh water through the second row of spray nozzles.
  • a method according to the preamble of claim 1 is known from FR-A 1 012 324.
  • a solvent is sprayed over a horizontal tube with a series of openings onto a dampening roller that is rotatably mounted and driven underneath. This removes the ink residues on the dampening roller and throws them off.
  • a device for cleaning screen printing screens is known.
  • the sieve to be cleaned is clamped on a frame in a chamber.
  • Below the sieve there are two pipes that can be rotated about their axis, each with a row of spray nozzles.
  • the screen is sprayed with a solvent through these nozzles.
  • the backflowing solvent is recycled through a filter and a pump.
  • the solvent vapors are extracted.
  • a similar device for cleaning screen printing screens with which water-soluble inks have been printed is known from US Pat. No. 3,656,493.
  • a slide is passed over the sieve in a two-dimensional pattern.
  • the slide carries a nozzle with which the screen is sprayed with a steam or water jet.
  • the feed pressure of the nozzle is significantly below 20 bar, otherwise the sieve would be torn apart.
  • This device is only suitable for screens that have water-soluble color residues.
  • FR-A 2 288 616 other solvents would have to be used for water-insoluble paints.
  • the invention has for its object to reduce the risk to the operating personnel from solvent vapors.
  • a cleaning cabin 1 in which a pressure cylinder 2 is cleaned with a high-pressure water jet.
  • the water 10 is drawn from a container 8 via a suction line 9 by a high-pressure pump 3 and fed to the nozzle in the cabin 1 via a high-pressure line 4 at a pressure between approximately 100 and 500 bar.
  • a drain line 5 is connected, which feeds the polluted water via a distributor screen 6 to a filter system 7.
  • the filter system 7 comprises an endless screen 21 stretched over two deflection rollers 22, 23, which carries a disposable paper filter belt 25.
  • One of the rollers 22, 23 is driven by a motor.
  • the filter belt 25 is drawn off from a supply roll 20, reaches the screen 21 via a deflection roller 24 and falls at the other end into a container 26.
  • the water cleaned by the filter system 7 drips back into the water container 8.
  • a return pump 16 is additionally arranged in the drain line 5, which returns the contaminated water to the distributor screen 6 via lines 17, 18.
  • Fig. 2 shows a section through the cleaning cabin 1, which has a trough-shaped lower part 1b and a closable cover 1a.
  • the pressure cylinder 2 carries the inner rings 30 of roller bearings on its journal 31.
  • the rings 30 are mounted on rollers 33, 35.
  • the roller 35 can be driven by a motor 37 via a shaft 36.
  • the cylinder 2 is rotated slowly.
  • a high-pressure water jet splashes out of a nozzle 12 against the cylinder surface and removes paint residues adhering to the printing cylinder through its impulse.
  • the roller 33 can be axially displaceable relative to its bearing 34 in order to be able to accommodate printing cylinders 2 of different lengths.
  • the nozzle 12 is arranged in a nozzle holder 40 which is fastened on a slide 50 which can be displaced along a C profile rail.
  • the longitudinal movement of the carriage 50 is controlled by an endless chain 57 attached to the carriage 50 and guided via deflection wheels 58, 59.
  • the one deflection wheel 59 is driven by a reversible motor 60.
  • the water is supplied to the nozzle 12 via a high-pressure hose 41 connected to the high-pressure line 4 and bores 42, 43.
  • a threaded spindle can also be provided, which engages in a nut attached to the slide 50.
  • the height of the rail 51 can be adjusted to adjust the distance between the nozzle 12 and the surface of the printing cylinder 2.
  • the rail 51 is fastened to swivel arms 52 which are pivotably mounted at one end by means of a bearing 53. Their swivel position is set by a cylinder 54 by means of its piston rod 55 via control lines 56.
  • a fixed rail can also be provided.
  • a vertical guide is provided on the slide 50, through which the height of the nozzle holder 40 is guided.
  • the vertical position of the nozzle holder can e.g. B. can be adjusted by a gear meshing with a rack.
  • the nozzle holder 40 is pivotably mounted on the carriage 50.
  • the slide 50 has vertical flanges 48, in which the cylindrical nozzle holder 40 is mounted.
  • the nozzle 12 is arranged in a radial attachment 44.
  • a radial arm 47 is connected to the nozzle holder 40 and is articulated on the piston rod of a cylinder 45.
  • the cylinder 45 is controlled via control lines 46.
  • both the distance of the nozzle 12 from the surface of the cylinder 2 and the pivoting angle of the nozzle 12 can be optimally adapted to the contour of the printing cylinder during the displacement of the slide 50.
  • nozzle movements can be preprogrammed so that the entire cleaning process runs automatically.
  • sensors in the cabin which scan the contour of the pressure cylinder and accordingly control the movements of the nozzle.
  • FIG. 4 a nozzle rotating during operation is shown in FIG. 4.
  • the nozzle holder 62 is fastened on a pin 61 of the slide 50 ′ so that it can rotate about a vertical axis.
  • the holes 63, 64 communicating with the high-pressure hose 41 are connected to an annular groove 65 in the nozzle holder 62.
  • the axes of the nozzles 12 connected to the annular groove 65 are arranged skew to the axis of the pin 61, so that the recoil of the water jet emerging from the nozzles 12 exerts a torque on the nozzle holder 62 and rotates it rapidly.
  • an anti-corrosion agent can be added to the water in the circuit.

Abstract

1. A method for cleaning colour residues from a printing cylinder by means of a liquid, characterised in that the printing cylinder (2) is sprayed with a high-pressure water jet with a feed pressure of over 100 bar, in such a manner, that the colour residues are removed wholly mechanically by the impact of the water jet.

Description

Herkömmlich werden Druckformen, z. B. Druckzylinder, mit Lösungsmitteln gereinigt, indem die Druckform in einer Reinigungskabine über ein gelochtes Rohr mit dem Lösungsmittel besprüht wird. Dabei werden die Farbreste auf der Druckform wenigstens teilweise im Lösungsmittel aufgelöst. Die gelösten Farbreste akkumulieren im Lösungsmittel, so dass dieses relativ oft ausgewechselt werden muss. Das verschmutzte Lösungsmittel ist dabei nur schwer umweltfreundlich zu beseitigen. Es ist auch sehr aufwendig, das Lösungsmittel in einem geschlossenen Kreislauf einzusetzen, weil die gelösten Farbreste schlecht chemisch wieder vom Lösungsmittel getrennt werden können. Ausserdem gefährdet bei bekannten Anlagen der Kontakt mit dem Lösungsmittel und seinen Dämpfen das Bedienungspersonal.Printing forms, e.g. B. printing cylinder, cleaned with solvents by spraying the printing form in a cleaning booth over a perforated tube with the solvent. The ink residues on the printing form are at least partially dissolved in the solvent. The dissolved color residues accumulate in the solvent, so that it has to be replaced relatively often. The contaminated solvent is difficult to remove in an environmentally friendly manner. It is also very expensive to use the solvent in a closed circuit because the dissolved paint residues are difficult to chemically separate from the solvent. In addition, in known systems, contact with the solvent and its vapors endangers the operating personnel.

Eine Vorrichtung gemäss Oberbegriff des Anspruchs 3 ist aus FR-A 1 249140 bekannt : Auf einem schwenkbaren Tisch wird eine flache Druckform befestigt und in senkrechte Lage geschwenkt. Zum Reinigen der Druckform fährt ihr ein Wagen entlang mit einer rotierenden, walzenförmigen Bürste und zwei Reihen von Sprühdüsen. Zunächst wird über die eine Sprühdüsenreihe ein Lösungsmittel auf die Druckform gesprüht. Damit werden, unterstützt durch die Bürste, die Farbrückstände gelöst. Anschliessend wird durch die zweite Sprühdüsenreihe die Druckform mit Frischwasser gespült.A device according to the preamble of claim 3 is known from FR-A 1 249140: A flat printing form is attached to a pivotable table and pivoted into a vertical position. To clean the printing form, you drive along a carriage with a rotating, roller-shaped brush and two rows of spray nozzles. First, a solvent is sprayed onto the printing form via the row of spray nozzles. With the help of the brush, the color residues are solved. The printing plate is then rinsed with fresh water through the second row of spray nozzles.

Ein Verfahren gemäß Oberbegriff des Anspruchs 1 ist aus der FR-A 1 012 324 bekannt. Hier wird in einer abgeschlossenen Kammer über ein horizontales Rohr mit einer Reihe von Öffnungen ein Lösungsmittel auf eine darunter drehbar gelagerte und angetriebene Feuchtwalze gesprüht. Damit werden die Farbrückstände auf der Feuchtwalze gelöst und abgeschleudert.A method according to the preamble of claim 1 is known from FR-A 1 012 324. Here, in a closed chamber, a solvent is sprayed over a horizontal tube with a series of openings onto a dampening roller that is rotatably mounted and driven underneath. This removes the ink residues on the dampening roller and throws them off.

Aus der FR-A 2 288 616 ist eine Vorrichtung zum Reinigen von Siebdrucksieben bekannt. Das zu reinigende Sieb wird in einer Kammer auf einen Rahmen gespannt Unterhalb des Siebes sind zwei um ihre Achse drehbare Rohre mit je einer Reihe von Sprühdüsen angeordnet. Ueber diese Düsen wird das Sieb mit einem Lösungsmittel besprüht. Das zurückfliessende Lösungsmittel wird über ein Filter und eine Pumpe rezykliert. Die Lösungsmitteldämpfe werden abgesaugt.From FR-A 2 288 616 a device for cleaning screen printing screens is known. The sieve to be cleaned is clamped on a frame in a chamber. Below the sieve there are two pipes that can be rotated about their axis, each with a row of spray nozzles. The screen is sprayed with a solvent through these nozzles. The backflowing solvent is recycled through a filter and a pump. The solvent vapors are extracted.

Eine ähnliche Vorrichtung zum Reinigen von Siebdrucksieben, mit welchen wasserlösliche Farben gedruckt wurden, ist aus der US-A 3 656 493 bekannt. Hier wird ein Schlitten in einem zweidimensionalen Muster über das Sieb geführt. Der Schlitten trägt eine Düse, mit welcher das Sieb mit einem Dampf- oder Wasserstrahl abgespritzt wird. Der Speisedruck der Düse ist wesentlich unter 20 bar, weil sonst das Sieb zerfetzt würde. Diese Vorrichtung eignet sich nur für Siebe, die wasserlösliche Farbrückstände haben. Für wasserunlösliche Farben müssten, wie bei der FR-A 2 288 616, andere Lösungsmittel verwendet werden.A similar device for cleaning screen printing screens with which water-soluble inks have been printed is known from US Pat. No. 3,656,493. Here a slide is passed over the sieve in a two-dimensional pattern. The slide carries a nozzle with which the screen is sprayed with a steam or water jet. The feed pressure of the nozzle is significantly below 20 bar, otherwise the sieve would be torn apart. This device is only suitable for screens that have water-soluble color residues. As with FR-A 2 288 616, other solvents would have to be used for water-insoluble paints.

Alle diese beschriebenen Vorrichtungen arbeiten mit einem Lösungsmittel und relativ niedrigen Drücken, basieren also auf dem Lösen der Farbreste mittels des Lösungsmittels. In einigen dieser Vorschläge wird zwar das Lösungsmittel in einem geschlossenen Kreislauf, allenfalls mit einem Filter, umgewälzt doch akkumulieren die gelösten Farbreste im Lösungsmittel, so dass es relativ oft ausgetauscht werden muss, was die erwähnten Probleme mit der Entsorgung nach sich zieht.All these described devices work with a solvent and relatively low pressures, so they are based on the dissolving of the paint residues by means of the solvent. In some of these proposals, although the solvent is circulated in a closed circuit, if necessary with a filter, the dissolved paint residues accumulate in the solvent, so that it has to be replaced relatively often, which leads to the mentioned problems with disposal.

Der Erfindung liegt die Aufgabe zugrunde, die Gefährdung des Bedienungspersonals durch Lösungsmitteldämpfe zu reduzieren.The invention has for its object to reduce the risk to the operating personnel from solvent vapors.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen der Ansprüche 1 und 3 gelöst.This object is achieved with the characterizing features of claims 1 and 3.

Der Kem dieser Lösung liegt darin, dass die Farbreste durch den Impuls eines Wasserstrahls abgelöst werden, also einer Flüssigkeit, in welcher die Farbreste nicht löslich sind.The essence of this solution is that the color residues are removed by the impulse of a water jet, i.e. a liquid in which the color residues are not soluble.

Dadurch ist es möglich, die abgelösten Farbreste durch einfaches Filtrieren wieder vom Wasser zu trennen, so dass das Wasser in einem geschlossenen Kreislauf eingesetzt werden kann und keine flüssigen Abfälle anfallen. Die abfiltrierten Farbreste sind umweltfreundlich beseitigbar, z. B. durch Verbrennen in Müllverbrennungsanlagen. Da als Reinigungsflüssigkeit bloss Wasser erforderlich ist, ist das Bedienungspersonal weder durch Hautkontakt noch durch Dämpfe gefährdet. Zudem ist die bei den herkömmlichen Reinigungsflüssigkeiten akute Explosions- und Brandgefahr beseitigt.This makes it possible to separate the removed paint residues from the water by simply filtering them, so that the water can be used in a closed circuit and no liquid waste is generated. The filtered paint residues are environmentally friendly, z. B. by burning in waste incineration plants. Since only water is required as the cleaning liquid, the operating personnel are not at risk from skin contact or vapors. In addition, the acute explosion and fire hazard associated with conventional cleaning fluids has been eliminated.

Aus der GB-A 2 003 840 ist es zwar bekannt, Plastikbehälter für Lebensmittel wie Früchte, Gemüse, Fleisch, Fisch oder Getränke mit einem Hochdruckwasserstrahl zu reinigen. Das Wasser kann in einem geschlossenen Kreislauf mit einer Hochdruckpumpe und Filtern umgewälzt werden. Da die Lebensmittel teilweise im Wasser gelöst werden, muss das Wasser ebenfalls periodisch gewechselt werden. Hier entsteht allerdings kein Entsorgungsproblem, weil das verschmutzte Wasser problemlos in die Kanalisation geleitet werden kann.From GB-A 2 003 840 it is known to clean plastic containers for foods such as fruits, vegetables, meat, fish or drinks with a high pressure water jet. The water can be circulated in a closed circuit with a high pressure pump and filters. Since some of the food is dissolved in the water, the water must also be changed periodically. However, there is no disposal problem here because the polluted water can be fed into the sewage system without any problems.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung beschrieben. Darin zeigt :

  • Fig. 1 ein Schema einer Anlage,
  • Fig. 2 einen Axialschnitt durch eine Reinigungskabine,
  • Fig. 3 einen Schnitt längs der Linie lll-lll in Fig. 2,
  • Fig. 4 eine Variante mit drehbarem Düsenhalter.
An exemplary embodiment of the invention is described below with reference to the drawing. It shows:
  • 1 is a diagram of a plant,
  • 2 shows an axial section through a cleaning booth,
  • 3 shows a section along the line III-III in FIG. 2,
  • Fig. 4 shows a variant with a rotatable nozzle holder.

Die Anlage gemäss Fig. 1 umfasst eine Reinigungskabine 1, in welcher ein Druckzylinder 2 mit einem Hochdruckwasserstrahl gereinigt wird. Das Wasser 10 wird aus einem Behälter 8 über eine Saugleitung 9 von einer Hochdruckpumpe 3 angesaugt und über eine Hochdruckleitung 4 mit einem Druck zwischen etwa 100 und 500 bar der Düse in der Kabine 1 zugeführt. An der Kabine 1 ist eine Abflussleitung 5 angeschlossen, welche das verschmutzte Wasser über ein Verteilersieb 6 einer Filteranlage 7 zuführt. Die Filteranlage 7 umfasst ein über zwei Umlenkwalzen 22, 23 gespanntes endloses Sieb 21, welches ein Einweg-Papierfilterband 25 trägt. Eine der Walzen 22, 23 ist motorisch angetrieben. Das Filterband 25 wird dabei von einer Vorratsrolle 20 abgezogen, gelangt über eine Umlenkwalze 24 auf das Sieb 21 und fällt am andem Ende in einen Behälter 26. Das durch die Filteranlage 7 gereinigte Wasser tropft zurück in den Wasserbehälter 8.1 comprises a cleaning cabin 1, in which a pressure cylinder 2 is cleaned with a high-pressure water jet. The water 10 is drawn from a container 8 via a suction line 9 by a high-pressure pump 3 and fed to the nozzle in the cabin 1 via a high-pressure line 4 at a pressure between approximately 100 and 500 bar. At the cabin 1 a drain line 5 is connected, which feeds the polluted water via a distributor screen 6 to a filter system 7. The filter system 7 comprises an endless screen 21 stretched over two deflection rollers 22, 23, which carries a disposable paper filter belt 25. One of the rollers 22, 23 is driven by a motor. The filter belt 25 is drawn off from a supply roll 20, reaches the screen 21 via a deflection roller 24 and falls at the other end into a container 26. The water cleaned by the filter system 7 drips back into the water container 8.

Falls aus Platzgründen die Filteranlage 7 nicht unterhalb der Reinigungskabine 1 angeordnet werden kann, ist in der Abflussleitung 5 zusätzlich eine Rücklaufpumpe 16 angeordnet, welche das verschmutzte Wasser über Leitungen 17, 18 dem Verteilersieb 6 zuführt.If, for reasons of space, the filter system 7 cannot be arranged below the cleaning cabin 1, a return pump 16 is additionally arranged in the drain line 5, which returns the contaminated water to the distributor screen 6 via lines 17, 18.

Fig. 2 zeigt einen Schnitt durch die Reinigungskabine 1, welche einen wannenförmigen Unterteil 1b und einen schliessbaren Deckel 1a aufweist. Der Druckzylinder 2 trägt auf seinen Lagerzapfen 31 die Innenringe 30 von Wälzlagem. Die Ringe 30 sind auf Rollen 33, 35 gelagert. Die Rolle 35 ist über eine Welle 36 durch einen Motor 37 antreibbar. Dadurch wird der Zylinder 2 langsam gedreht. Während dieser Drehung spritzt ein Hochdruckwasserstrahl aus einer Düse 12 gegen die Zylinderoberfläche und löst durch seinen Impuls auf dem Druckzylinder haftende Farbreste ab. Die Rolle 33 kann gegenüber ihrem Lager 34 axial verschiebbar sein, um unterschiedlich lange Druckzylinder 2 aufnehmen zu können.Fig. 2 shows a section through the cleaning cabin 1, which has a trough-shaped lower part 1b and a closable cover 1a. The pressure cylinder 2 carries the inner rings 30 of roller bearings on its journal 31. The rings 30 are mounted on rollers 33, 35. The roller 35 can be driven by a motor 37 via a shaft 36. As a result, the cylinder 2 is rotated slowly. During this rotation, a high-pressure water jet splashes out of a nozzle 12 against the cylinder surface and removes paint residues adhering to the printing cylinder through its impulse. The roller 33 can be axially displaceable relative to its bearing 34 in order to be able to accommodate printing cylinders 2 of different lengths.

Die Düse 12 ist in einem Düsenhalter 40 angeordnet, der auf einem längs einer C-Profilschiene verschiebbaren Schlitten 50 befestigt ist. Die Längsbewegung des Schlittens 50 wird durch eine am Schlitten 50 befestigte, über Umlenkräder 58, 59 geführte endlose Kette 57 gesteuert. Das eine Umlenkrad 59 wird dazu durch einen reversierbaren Motor 60 angetrieben. Das Wasser wird über einen mit der Hochdruckleitung 4 verbundenen Hochdruckschlauch 41 und Bohrungen 42, 43 der Düse 12 zugeführt.The nozzle 12 is arranged in a nozzle holder 40 which is fastened on a slide 50 which can be displaced along a C profile rail. The longitudinal movement of the carriage 50 is controlled by an endless chain 57 attached to the carriage 50 and guided via deflection wheels 58, 59. The one deflection wheel 59 is driven by a reversible motor 60. The water is supplied to the nozzle 12 via a high-pressure hose 41 connected to the high-pressure line 4 and bores 42, 43.

Statt der Kette 57 kann auch eine Gewindespindel vorgesehen werden, die in eine am Schlitten 50 befestigte Mutter eingreift.Instead of the chain 57, a threaded spindle can also be provided, which engages in a nut attached to the slide 50.

Zur Einstellung des Abstandes zwischen der Düse 12 und der Oberfläche des Druckzylinders 2 ist die Schiene 51 in der Höhe einstellbar. Dazu ist die Schiene 51 an Schwenkarmen 52 befestigt, die am einen Ende mittels eines Lagers 53 schwenkbar gelagert sind. Ihre Schwenkstellung wird durch einen Zylinder 54 mittels dessen Kolbenstange 55 über Steuerleitungen 56 eingestellt.The height of the rail 51 can be adjusted to adjust the distance between the nozzle 12 and the surface of the printing cylinder 2. For this purpose, the rail 51 is fastened to swivel arms 52 which are pivotably mounted at one end by means of a bearing 53. Their swivel position is set by a cylinder 54 by means of its piston rod 55 via control lines 56.

Statt der in der Höhe einstellbaren Schiene 51 kann auch eine fest montierte Schiene vorgesehen werden. Auf dem Schlitten 50 ist in diesem Fall eine vertikale Führung vorgesehen, durch welche der Düsenhalter 40 in der Höhe einstellbar geführt ist. Die vertikale Stellung des Düsenhalters kann z. B. durch ein mit einer Zahnstange kämmendes Zahnrad eingestellt werden.Instead of the height-adjustable rail 51, a fixed rail can also be provided. In this case, a vertical guide is provided on the slide 50, through which the height of the nozzle holder 40 is guided. The vertical position of the nozzle holder can e.g. B. can be adjusted by a gear meshing with a rack.

Um auch die Stimflächen 32 des Zylinders 2 durch den Wasserstrahl bestreichen zu können, ist der Düsenhalter 40 auf dem Schlitten 50 schwenkbar gelagert. Dazu weist der Schlitten 50 vertikale Flansche 48 auf, in welchen der zylindrische Düsenhalter 40 gelagert ist. Die Düse 12 ist in einem radialen Aufsatz 44 angeordnet. Mit dem Düsenhalter 40 ist ein radialer Arm 47 verbunden, der an der Kolbenstange eines Zylinders 45 angelenkt ist. Der Zylinder 45 wird über Steuerleitungen 46 angesteuert.In order to be able to also coat the end faces 32 of the cylinder 2 with the water jet, the nozzle holder 40 is pivotably mounted on the carriage 50. For this purpose, the slide 50 has vertical flanges 48, in which the cylindrical nozzle holder 40 is mounted. The nozzle 12 is arranged in a radial attachment 44. A radial arm 47 is connected to the nozzle holder 40 and is articulated on the piston rod of a cylinder 45. The cylinder 45 is controlled via control lines 46.

Damit kann während der Verschiebung des Schlittens 50 sowohl der Abstand der Düse 12 von der Oberfläche des Zylinders 2 als auch der Schwenkwinkel der Düse 12 optimal der Kontur des Druckzylinders angepasst werden.Thus, both the distance of the nozzle 12 from the surface of the cylinder 2 and the pivoting angle of the nozzle 12 can be optimally adapted to the contour of the printing cylinder during the displacement of the slide 50.

Diese Düsenbewegungen können vorprogrammiert werden, so dass der ganze Reinigungsvorgang automatisch abläuft. Es ist jedoch zum selben Zweck auch möglich, in der Kabine Fühler vorzusehen, welche die Kontur des Druckzylinders abtasten und entsprechend die Bewegungen der Düse steuern.These nozzle movements can be preprogrammed so that the entire cleaning process runs automatically. However, for the same purpose it is also possible to provide sensors in the cabin which scan the contour of the pressure cylinder and accordingly control the movements of the nozzle.

Als Variante zu einer schwenkbaren Düse ist in Fig. 4 eine im Betrieb rotierende Düse dargestellt Der Düsenhalter 62 ist um eine vertikale Achse drehbar auf einem Zapfen 61 des Schlittens 50' befestigt. Die mit dem Hochdruckschlauch 41 kommunizierenden Bohrungen 63, 64 sind mit einer Ringnut 65 im Düsenhalter 62 verbunden. Die Achsen der mit der Ringnut 65 verbundenen Düsen 12 sind windschief zur Achse des Zapfens 61 angeordnet, so dass der Rückstoss des aus den Düsen 12 austretenden Wasserstrahls ein Drehmoment auf den Düsenhalter 62 ausübt und diesen rasch dreht.As a variant of a pivotable nozzle, a nozzle rotating during operation is shown in FIG. 4. The nozzle holder 62 is fastened on a pin 61 of the slide 50 ′ so that it can rotate about a vertical axis. The holes 63, 64 communicating with the high-pressure hose 41 are connected to an annular groove 65 in the nozzle holder 62. The axes of the nozzles 12 connected to the annular groove 65 are arranged skew to the axis of the pin 61, so that the recoil of the water jet emerging from the nozzles 12 exerts a torque on the nozzle holder 62 and rotates it rapidly.

Um ein Rosten der Druckform zu vermeiden, kann dem Wasser im Kreislauf ein Antikorrosionsmittel beigegeben werden.To prevent the printing form from rusting, an anti-corrosion agent can be added to the water in the circuit.

Claims (7)

1. A method for cleaning colour residues from a printing cylinder by means of a liquid, characterised in that the printing cylinder (2) is sprayed with a high-pressure water jet with a feed pressure of over 100 bar, in such a manner, that the colour residues are removed wholly mechanically by the impact of the water jet
2. A method according to Claim 1, characterised in that the water sprayed on the printing attachment (2) is collected, filtered and thereafter re-used in a closed cycle.
3. An apparatus for carrying out the method according to Claim 1, comprising a cleaning cabin (1) with supports (33, 35) for a printing attachment (2) and with a nozzle (12) which is fast with a nozzle holder (40) which is slidable in the cabin (1) along a line, a filter (7) connected to the cabin (1) through an outlet conduit (5) as well as a pump (3), the delivery side of which is connected through a hose (41) with the nozzle (12), characterised in that the pump (3) is constructed as a high-pressure pump with an operating pressure greater than 100 bar, that the hose (41) is a high-pressure hose, that only one nozzle (12) is mounted on the nozzle holder (40), that the support consists of two roller pairs (33, 35) for receiving the journals (31) of the printing attachment (2) having the form of a printing cylinder, and that one of the roller pairs (35) is connected with a motor (37) for slow rotation of the printing cylinder.
4. An apparatus according to Claim 3, characterised in that the intake side of pump (3) is connected with the discharge side of filter (7).
5. An apparatus according to Claim 3 or 4, characterised in that the filter (7) comprises a filter belt (25) which can be drawn from a magazine roll (20)..
6. An apparatus according to any one of Claims 3 to 5, characterised in that the line of displacement of the nozzle holder (40) is adjustable relative to the supports (33, 35).
7. An apparatus according to any one of Claims 3 to 6, characterised in that the nozzle holder (40) is pivotable.
EP85810469A 1984-10-31 1985-10-14 Method and device for cleaning a printing form Expired EP0180541B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810469T ATE47690T1 (en) 1984-10-31 1985-10-14 METHOD AND PLANT FOR CLEANING A PRINTING FORM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5241/84 1984-10-31
CH524184 1984-10-31

Publications (2)

Publication Number Publication Date
EP0180541A1 EP0180541A1 (en) 1986-05-07
EP0180541B1 true EP0180541B1 (en) 1989-11-02

Family

ID=4290301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810469A Expired EP0180541B1 (en) 1984-10-31 1985-10-14 Method and device for cleaning a printing form

Country Status (3)

Country Link
EP (1) EP0180541B1 (en)
AT (1) ATE47690T1 (en)
DE (1) DE3574000D1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4118944A1 (en) * 1991-06-08 1992-12-10 Ind Siebdruck Systeme Neckarwe Cleaning device for circuit board printing mask - uses cleaning jets moved along both sides of mask in lowered cleaning position
DE4224511A1 (en) * 1992-07-24 1994-01-27 Albert Rose Zweigniederlassung Removing template sediments from screen printing template support - involves directing liq. jet at impingement pressure, sufficient for mechanical removal, onto template support
AUPM470494A0 (en) * 1994-03-24 1994-04-21 Deegan, Terence Michael Cleaning method means
DE19845367C2 (en) * 1998-10-02 2002-12-19 Gsb Wahl Gmbh Method and device for cleaning parts of printing machines
EP1038674A1 (en) * 1999-02-26 2000-09-27 Alfred M. Petersen Blast cleaning apparatus for printing machines
US20020157205A1 (en) * 2001-04-27 2002-10-31 Akira Hara Cylinder cleaning brush unit
DE20203521U1 (en) * 2002-03-05 2002-05-29 Technotrans Ag Filter device for the dampening solution circuit of an offset printing machine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB326588A (en) * 1929-01-01 1930-03-20 Hermann Hahn Improvements in apparatus for cleaning metal articles
FR1012324A (en) * 1950-02-10 1952-07-08 Traitement Interne Des Chaudie Machine for cleaning rollers of printing machines
FR1146383A (en) * 1956-03-29 1957-11-12 Filtered
FR1249140A (en) * 1960-02-25 1960-11-14 Machine for cleaning and drying printing forms
US3656493A (en) * 1969-09-11 1972-04-18 Black James Screen washing apparatus
FR2288616A1 (en) * 1974-10-21 1976-05-21 Tiflex Ets Silk printing screen washing equipment - has closed tank with hollow rotary spray shafts and perforated screen support
FR2293252A1 (en) * 1974-12-02 1976-07-02 Benhaim Albert High pressure cleaning jet nozzle - has head with discharge slot between two blocks with chamber behind
DE2740923A1 (en) * 1977-09-10 1979-03-22 Woma Maasberg Co Gmbh W DEVICE FOR CLEANING FLAT BODIES OR THE LIKE. CLEANING GOODS, ESPECIALLY PLASTIC CASES

Also Published As

Publication number Publication date
DE3574000D1 (en) 1989-12-07
ATE47690T1 (en) 1989-11-15
EP0180541A1 (en) 1986-05-07

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