EP0609693B1 - Device for capturing vagrant aerosol in a rotary printing machine - Google Patents

Device for capturing vagrant aerosol in a rotary printing machine Download PDF

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Publication number
EP0609693B1
EP0609693B1 EP94100677A EP94100677A EP0609693B1 EP 0609693 B1 EP0609693 B1 EP 0609693B1 EP 94100677 A EP94100677 A EP 94100677A EP 94100677 A EP94100677 A EP 94100677A EP 0609693 B1 EP0609693 B1 EP 0609693B1
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EP
European Patent Office
Prior art keywords
roller
aerosol
capturing
receptor
contact
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
EP94100677A
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German (de)
French (fr)
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EP0609693A1 (en
Inventor
Martin Schoeps
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Koenig and Bauer AG
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Koenig and Bauer Albert AG
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Publication of EP0609693A1 publication Critical patent/EP0609693A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F7/00Rotary lithographic machines
    • B41F7/20Details
    • B41F7/24Damping devices
    • B41F7/30Damping devices using spraying elements

Definitions

  • the invention relates to a device for trapping a stray aerosol according to the preamble of claim 1.
  • US-A-31 39 028 has made known a generic device for trapping vagabond aerosol in a printing press.
  • the device is arranged in the vicinity of the circumference of a receptor roller, wherein it cooperates with at least one further roller, on which it delivers a liquid application.
  • the generic device is - seen in the direction of rotation of the receptor roller - in front of a point of contact of the receptor roller with the roller interacting with it.
  • the facility is also geared towards the receptor roller itself.
  • DE-PS 622359 also shows a device for trapping vagabond aerosol. This device is also oriented towards a receptor roller.
  • a humidification device has become known from US-A-40 44 674, in which by means of a spraying device, dampening solution is applied to dampening solution rollers, which transfer the dampening solution to a plate cylinder by means of damp application pads.
  • dampening solution rollers which transfer the dampening solution to a plate cylinder by means of damp application pads.
  • spray nozzles arranged in the axial direction above the dampening solution rollers are shielded on both sides by spray shields running in the same direction against escaping dampening solution.
  • a brush dampening unit has become known from US-A-41 43 596 and a centrifugal dampening unit from US-A-40 34 670 for applying dampening solution to dampening solution rollers of a rotary printing press.
  • the invention has for its object to provide a device for preventing the precipitation of unwanted aerosol-like media on parts of a rotary printing press.
  • the invention has the following advantages in particular: By removing the unwanted moisture and / or color particles in volatile Form is recovered depending on the intended use of printing ink or dampening solution or cleaning liquid. This also removes undesired paint particles that cannot be transported immediately by the transfer rollers, so that at least the cross section of the spray cone emerging through the nozzle outlet opening is not impaired. Furthermore, by preventing the undesirable settling of very finely divided particles on machine parts, corrosion-resistant coatings on these machine parts can be dispensed with.
  • FIG. 1 shows a schematic side view of a device according to the invention, which consists of a transmission device or droplet generator device, generally designated 1, for a droplet-capable medium and a discharge device or aerosol trap device, generally designated 2, for a droplet-capable medium.
  • Both devices 1, 2 are housed together in a housing 3 which extends in the axial direction to two transfer rollers, which are designed as a receptor roller 4 and a smoothing roller 6 cooperating with it.
  • the receptor roller 4 is connected to a plate cylinder 8 via a further transfer roller 7.
  • the devices 1, 2 are arranged at an angle which can be in a range from three to 90 °.
  • the housing 3 is approximately U-shaped in cross section and is directed with its free edges 12, 13 against the outer surface of the smoothing roller 6 or the receptor roller 4.
  • the distance of the free edges 12, 13, against the rollers 6, 4 is minimal and can be in the range from 0.5 to 25 mm.
  • the generator device 1 preferably flat jet nozzles, of which only two nozzles 14, 16 are shown in FIG. 2.
  • the nozzles 14, 16 are form-fitting in a holding element 17, e.g. B. attached to an axially extending sheet metal strip.
  • the nozzles 14, 16 are each connected to a solenoid valve 18 which controls the supply of dampening solutions via an electrical connection 19.
  • the dampening solution is supplied via a connection 21 on the solenoid valve 18.
  • the upper free edge 12 of the housing 3 which is U-shaped in cross section and extends in the axial direction towards the rollers 4, 6 can be pivoted with its subsequent upper housing part 22 about a hinge 23, so that after the upper housing part 22 has been swung forward, only the holding element 17 with the nozzles 14, 16 remains, which is attached to a lower housing part 24.
  • the two devices 1, 2 are accommodated in the front part of the housing 3 which is open in the direction of the rollers 4, 6. Both devices 1, 2 are separated by a guide plate 26, which is arranged parallel to the housing parts 22, 24 and extends in the axial direction of the rollers 4, 6. An end 27 of the guide plate 26 which extends in the direction of the rollers 4, 6, with its edge 28 which extends in the axial direction to the rollers 4, 6, is short of the outer surface of the receptor roller 4 arranged.
  • the guide plate 26 is arranged to be adjustable in the direction B on the rollers 4, 6, so that a gap f located between the edge 28 (FIG. 3) of the guide plate 26 and the outer surface of the receptor roller 4 has a size of approximately between 0.5 to 25 mm is adjustable.
  • the guide plate 26 can be made in two parts and overlap one another, so that this can be moved in the direction of arrow B by means of indicated screws 31 and the elongated holes located on the upper part of the guide plate 26.
  • the guide plate 26 is held by supports 32, 33 arranged in a form-fitting manner on the lower housing part 24.
  • the supports 32, 33 are in the direction of movement C by means of a threaded spindle 34 and a handle attached thereto, for. B. a knurled nut 36 adjustable in height.
  • the guide plate 26 is simultaneously adjusted in this direction of movement C.
  • the guide plate 26 is angled at right angles in the direction of its second end 37 in the direction of the lower housing part 24 and extends to the lower housing part 24.
  • the height of the guide plate 26 can be adjusted in the C direction.
  • the baffle 26 is angled such that its second end 37 extends at a distance d from the parallel holding element 17, so that a channel 39 is formed for the discharge device, through which moisture or paint particles can be discharged.
  • a channel 39 is formed for the discharge device, through which moisture or paint particles can be discharged.
  • one or more discharge ports 41 are arranged on the lower housing part (24), which is connected via a cleaning or filter system (not shown).
  • the guide plate 26 has U-shaped recesses 42 in the vicinity of the nozzles 14, 16, through which the spray heads of the nozzles 14, 16 protrude through.
  • the devices 1, 2 are limited at the end by the side shields 43, 44, which are adapted to the contour of the rollers 4, 6.
  • the devices 1, 2 arranged in the housing 3 are arranged with respect to the rollers 4, 6 in such a way that a spray jet 46 from the nozzles 14, 16 is directed onto the outer surface of the receptor roller 4.
  • An opening 47 of the discharge device 2 directed in the direction of the rollers 4, 6 aims at a line of contact 55 between the receptor roller 4 and the smoothing roller 6 over its entire axial length.
  • the opening 47 has a clear width e seen in cross section.
  • the device works as follows: From the nozzles 14, 16 z. B. dampening solution applied to the clockwise rotating receptor roller 4 and transported further by this in the direction of the contact line 55, which is formed with the counterclockwise rotating smoothing roller 6.
  • the application of the dampening solution produces aerosols, that is to say volatile, mist-like particles, which are entrained in the direction of rotation of the receptor roller 4 by the air flow circulating around the receptor roller 4.
  • These particles emerging behind the edge 28 are discharged through the opening 47.
  • the edge 28 of the first end 27 of the guide plate 26 serves as a tear-off edge in terms of flow technology, so that the volatile aerosols are deflected behind the edge 28 and diverted away.
  • the Air flows of the smoothing roller 6 and the receptor roller 4 are deflected in the roller inlet nip 48 due to physical conditions in the direction of the discharge device 2.
  • the volatile particles are thus discharged through the opening 47.
  • This also applies to the anti-clockwise smoothing roller 6, which partly recycles aerosols, which can now be removed in a controlled manner.
  • color particles are transferred back from the plate cylinder 8 via the transfer roller 7 to the receptor roller 4, which previously hovered uncontrollably in the transfer device 1 and could settle near the openings of the nozzles 14, 16. These color particles are now also suctioned off.
  • the edge 28 of the first end 27 of the guide plate 26 located in the vicinity of the receptor roller 4 minus a gap 29 can have different cross sections, e.g. B. be angled in the direction of the upper housing part 22 or the lower housing part 24, be sharp or rounded.
  • the edge 28 can also be provided with a bead which, viewed in cross section, is circular with a diameter which corresponds to two to four times the material density of the end 27 of the guide plate 26.
  • the edge 28 can also be designed at right angles in a simple material thickness.
  • the device according to the invention makes it possible to apply cleaning agents to ink application rollers, ink rubbing cylinders, ink transfer rollers and blanket cylinders.
  • the device according to the invention can be used when applying ink to the rollers of an inking unit.
  • FIG. 4 shows a second exemplary embodiment of a device according to the invention.
  • a housing 3 only the transmission device 1 for droplet media, z. B. arranged in the form of a spray dampening system.
  • the housing 3 also consists of an upper and a lower housing part 22, 24, the upper housing part 22 being pivotable by means of a hinge 23.
  • a housing-fixed holder 17 for receiving the nozzle 16 with the associated solenoid valve 18 is angled below the upper housing part 22 and serves as a support for the upper articulated housing part 22.
  • a discharge device, generally designated 49, with a housing 50 is placed, which is arranged parallel to the transmission device 1. and, seen in cross section according to FIG.
  • the housing 50 of the discharge device 49 is non-positively and positively connected on the upper housing part 22 of the transmission device 1 by means of a symbolically indicated dovetail guide 54, so that the discharge device 49 can be moved in the direction of arrow B.
  • a cooling device 56 can be incorporated, by means of cooling coils indicated in cross section, or, as shown, can be applied on the outside of the housing 50, so that the discharged particles can condense.
  • the discharge device 49 is provided with a derivative 57 for the discharge, for. B. provided suction medium. Otherwise, the explanations of the first exemplary embodiment apply.
  • a discharge device 58 which consists of a trough 59 which is arranged on the upper housing part 22 and runs parallel to it and over which one or more cooling devices 61 are attached, to which the excess dripable medium condenses, drips into the tub 59 and is discharged via the discharge line 57. It is then also possible to replace the cooling device 61 with one designed as a cathode or anode Arrange electrode 62 in the form of a metal plate on which the droplet-capable medium settles, provided that a medium mixed with a positive or negative electrical charge, e.g. B. dampening solution by the transmission device 1, z. B. is applied via the nozzles 14, 16.
  • a medium mixed with a positive or negative electrical charge e.g. B. dampening solution by the transmission device 1, z. B.
  • a discharge device 63 is provided which has a function analogous to that of the discharge device 49 shown in FIG. 4, but which is arranged completely separately from the transmission device 1 and with excess medium from a roll inlet gap 64 between the receptor roll 4 and the transfer roller 7 is suctioned off.
  • the transmission device 1 is seen in the direction of rotation of the receptor roller 4 and is arranged in front of the roller inlet gap 64.
  • the aerosol (mist) trap 2; 49; 58; 63 is at a distance f from the circumference and in a position around the circumference of the receptor roller 4, seen in the direction of rotation of the receptor roller 4, before or after a line of contact 55 of the receptor roller 4 with an immediately next roller 6 interacting with it; 7 arranged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Description

Die Erfindung betrifft eine Einrichtung zum Einfangen eines vagabundierenden Aerosol entsprechend dem Oberbegriff des Patentanspruches 1.The invention relates to a device for trapping a stray aerosol according to the preamble of claim 1.

Durch die US-A-31 39 028 ist eine gattungsgemäße Einrichtung zum Einfangen von vagabundierendem Aerosol in einer Druckmaschine bekanntgeworden. Die Einrichtung ist in der Nähe des Umfanges einer Receptorwalze angeordnet, wobei sie mit mindestens einer weiteren Walze zusammenwirkt, auf welche sie einen Flüssigkeitsauftrag abgibt. Die gattungsgemäße Einrichtung ist - in Drehrichtung der Receptorwalze gesehen - vor einer Berührungsstelle der Receptorwalze mit der mit ihr zusammenwirkenden Walze angeordnet. Die Einrichtung ist außerdem auf die Receptorwalze selbst hin ausgerichtet.US-A-31 39 028 has made known a generic device for trapping vagabond aerosol in a printing press. The device is arranged in the vicinity of the circumference of a receptor roller, wherein it cooperates with at least one further roller, on which it delivers a liquid application. The generic device is - seen in the direction of rotation of the receptor roller - in front of a point of contact of the receptor roller with the roller interacting with it. The facility is also geared towards the receptor roller itself.

Die DE-PS 622359 zeigt ebenfalls eine Einrichtung zum Einfangen von vagabundierendem Aerosol. Diese Einrichtung ist ebenfalls auf eine Receptorwalze hin ausgerichtet.DE-PS 622359 also shows a device for trapping vagabond aerosol. This device is also oriented towards a receptor roller.

Durch die US-A-40 44 674 ist eine Befeuchtungseinrichtung bekanntgeworden, bei welcher mittels einer Sprühvorrichtung Feuchtmittel auf Feuchtmittelwalzen aufgebracht werden, welche das Feuchtmittel über Feuchtauftragswatzen auf einen Plattenzylinder übertragen. Dabei werden in axialer Richtung über den Feuchtmittelwalzen angeordnete Sprühdüsen beidseits durch in gleicher Richtung verlaufende Sprühschilde gegen austretendes Feuchtmittel abgeschirmt.A humidification device has become known from US-A-40 44 674, in which by means of a spraying device, dampening solution is applied to dampening solution rollers, which transfer the dampening solution to a plate cylinder by means of damp application pads. In this case, spray nozzles arranged in the axial direction above the dampening solution rollers are shielded on both sides by spray shields running in the same direction against escaping dampening solution.

Durch die US-A-41 43 596 ist ein Bürstenfeuchtwerk und durch die US-A-40 34 670 ist ein Schleuderfeuchtwerk zum Aufbringen von Feuchtmittel auf Feuchtmittelwalzen einer Rotationsdruckmaschine bekanntgeworden.A brush dampening unit has become known from US-A-41 43 596 and a centrifugal dampening unit from US-A-40 34 670 for applying dampening solution to dampening solution rollers of a rotary printing press.

Nachteilig bei diesen Einrichtungen ist, daß das gegen eine oder mehrere Feuchtmittelwalzen gesprühte Feuchtmittel als Aerosol teilweise unkontrolliert im Druckwerksraum umherschwebt. Nach der US-PS 40 44 674 tritt Feuchtmittel in Form von Aerosol aus einem Spalt zwischen der Manteloberfläche der Feuchtmittelwalzen und den Kanten der axial verlaufenden Sprühschilde aus, zumal dann, wenn das Feuchtmittel mit einem Hochgeschwindigkeitsstrahl aus der Düse austritt und die Feuchtmittelwalzen mit einer glatten, harten Mantelfläche ausgeführt sind. Ein in solcher Art austretendes Aerosol ist jedoch unerwünscht, da einerseits ein Verlust an Feuchtmittel eintritt und andererseits das durch den Spalt austretende Feuchtmittel bzw. Aerosol bereits mit vom Plattenzylinder zurückgeführten Farbpartikeln angereichert sein kann. Diese Farbpartikel können sich in der Nähe des Düsenaustritts absetzen, was zu Verengungen des Düsenaustritts und somit zu Veränderungen des Sprühkegels des austretenden Feuchtmittels führen kann, was wiederum Unregelmäßigkeiten beim Feuchtmittelauftrag zur Folge hat.A disadvantage of these devices is that the sprayed against one or more fountain solution rollers The dampening solution as an aerosol is floating around in the printing unit room in an uncontrolled manner. According to US Pat. No. 4,044,674, dampening solution in the form of aerosol emerges from a gap between the jacket surface of the dampening solution rollers and the edges of the axially extending spray shields, especially when the dampening solution emerges from the nozzle with a high-speed jet and the dampening solution rollers with a smooth one , hard outer surface are executed. However, an aerosol that emerges in this way is undesirable since, on the one hand, there is a loss of dampening solution and, on the other hand, the dampening solution or aerosol emerging through the gap can already be enriched with ink particles returned from the plate cylinder. These color particles can settle near the nozzle outlet, which can lead to narrowing of the nozzle outlet and thus to changes in the spray cone of the emerging dampening solution, which in turn leads to irregularities in the application of the dampening solution.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung zum Verhindern des Niederschlages unerwünschter aerosolartiger Medien auf Teile einer Rotationsdruckmaschine zu schaffen.The invention has for its object to provide a device for preventing the precipitation of unwanted aerosol-like media on parts of a rotary printing press.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des kennzeichnenden Teils des Patentanspruches 1 gelöst.According to the invention, this object is achieved by the features of the characterizing part of patent claim 1.

Durch die Erfindung treten insbesondere folgende Vorteile ein: Durch das Abführen der unerwünschten Feucht- und / oder Farbpartikel in flüchtiger Form wird je nach Verwendungszweck Druckfarbe oder Feuchtmittel bzw. Reinigungsflüssigkeit zurückgewonnen. Somit werden auch unerwünschte Farbpartikel entfernt, die nicht durch die Übertragungswalzen sofort weitertransportiert werden können, so daß zumindest der durch die Düsenaustrittsöffnung austretende Sprühkegel nicht in seinem Querschnitt beeinträchtigt wird. Weiterhin kann durch das Verhindern des unerwünschten Absetzens feinstverteilter Partikel auf Maschinenteile auf korrosionsbeständige Überzüge dieser Maschinenteile verzichtet werden.The invention has the following advantages in particular: By removing the unwanted moisture and / or color particles in volatile Form is recovered depending on the intended use of printing ink or dampening solution or cleaning liquid. This also removes undesired paint particles that cannot be transported immediately by the transfer rollers, so that at least the cross section of the spray cone emerging through the nozzle outlet opening is not impaired. Furthermore, by preventing the undesirable settling of very finely divided particles on machine parts, corrosion-resistant coatings on these machine parts can be dispensed with.

Die Erfindung wird an mehreren Ausführungsbeispielen näher erläutert. Die zugehörigen Zeichnungen zeigen in

Fig. 1
eine schematische Seitenansicht einer erfindungsgemäßen Vorrichtung,
Fig. 2
einen Schnitt II - II nach Fig. 1,
Fig. 3
eine vergrößerte Darstellung der Abführvorrichtung am Walzeneinlaufspalt,
Fig. 4
eine schematische Seitenansicht einer erfindungsgemäßen Vorrichtung in einem zweiten Ausführungsbeispiel,
Fig. 5
ein drittes Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung,
Fig. 6
ein viertes Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung
The invention is explained in more detail using several exemplary embodiments. The associated drawings show in
Fig. 1
2 shows a schematic side view of a device according to the invention,
Fig. 2
2 shows a section II-II according to FIG. 1,
Fig. 3
an enlarged view of the discharge device at the roll inlet nip,
Fig. 4
2 shows a schematic side view of a device according to the invention in a second exemplary embodiment,
Fig. 5
a third embodiment of a device according to the invention,
Fig. 6
a fourth embodiment of a device according to the invention

Nach Fig. 1 ist die schematische Seitenansicht einer erflndungsgemäßen Vorrichtung dargestellt, welche aus einer insgesamt mit 1 bezeichneten Übertragungseinrichtung bzw. Tröpfchenerzeugereinrichtung für ein tröpfchenfähiges Medium und aus einer insgesamt mit 2 bezeichneten Abführeinrichtung bzw. Aerosol-Fangeinrichtung für ein tröpfchenfähiges Medium besteht. Beide Einrichtungen 1, 2 sind gemeinsam in einem Gehäuse 3 untergebracht, welches sich in axialer Richtung zu zwei Übertragungswalzen erstreckt, welche als Receptorwalze 4 und eine mit dieser zusammenwirkenden Glättungswalze 6 ausgeführt sind. Die Receptorwalze 4 steht über eine weitere Übertragungswalze 7 mit einem Plattenzylinder 8 in Verbindung. Die Einrichtungen 1, 2 sind in einem Winkel , der in einem Bereich von drei bis 90° liegen kann, angeordnet. Dabei ist es auch möglich, die Einrichtungen 1, 2 im Gehäuse 3 um eine Senkrechte 11 zu schwenken, so daß eine zur Senkrechten 11 spiegelbildlich angeordnete Zylindergruppe, analog der mit den Walzen 4, 6, 7 und dem Zylinder 8, ebenfalls mit einem tröpfchenfähigen Medium beaufschlagt werden kann. Das Gehäuse 3 ist im Querschnitt etwa U - förmig ausgebildet und ist mit seinen freien Kanten 12, 13 gegen die Mantelfläche der Glättungswalze 6 bzw. der Receptorwalze 4 gerichtet. Der Abstand der freien Kanten 12, 13, gegen die Walzen 6, 4 ist minimal und kann im Bereich von 0,5 bis 25 mm liegen. Im unteren bzw. hinteren Teil des Gehäuses 3 befinden sich mehrere, in axialer Richtung angeordnete Drüsen 14, 16, der Erzeugereinrichtung 1, vorzugsweise Flachstrahldüsen, von denen in Fig. 2 lediglich zwei Düsen 14, 16 dargestellt sind. Die Düsen 14, 16 sind formschlüssig in einem gehäusefesten Halteelement 17, z. B. einem sich in axialer Richtung erstreckendem Blechstreifen befestigt. Die Düsen 14, 16 stehen jeweils mit einem Magnetventil 18 in Verbindung, welches über einen elektrischen Anschluß 19 die Zufuhr von Feuchtmitteln steuert. Die Feuchtmittelzufuhr erfolgt über einen Anschluß 21 am Magnetventil 18. Die obere freie, sich in axialer Richtung zu den Walzen 4, 6 erstreckende Kante 12 des im Querschnitt U - förmigen Gehäuses 3 ist mit seinem nachfolgendem oberen Gehäuseteil 22 um ein Scharnier 23 schwenkbar, so daß nach Vorschwenken des oberen Gehäuseteils 22 nur noch das Halteelement 17 mit den Düsen 14, 16 stehen bleibt, was an einem unteren Gehäuseteil 24 befestigt ist. Im vorderen, in Richtung der Walzen 4, 6 geöffneten Teil des Gehäuses 3 sind die beiden Einrichtungen 1, 2 untergebracht. Beide Einrichtungen 1, 2 sind durch ein Leitblech 26 getrennt, welches parallel zu den Gehäuseteilen 22, 24 angeordnet ist und sich in axialer Richtung der Walzen 4, 6 erstreckt. Ein sich in Richtung der Walzen 4, 6 erstreckendes Ende 27 des Leitbleches 26 ist mit seiner sich in axialer Richtung zu den Walzen 4, 6 erstreckenden Kante 28 kurz vor der Mantelfläche der Receptorwalze 4 angeordnet. Dazu ist das Leitblech 26 in Richtung B auf die Walzen 4, 6 verstellbar angeordnet, so daß ein zwischen der Kante 28 (Fig. 3) des Leitbleches 26 und der Mantelfläche der Receptorwalze 4 befindlicher Spalt f in seiner Größe etwa zwischen 0,5 bis 25 mm einstellbar ist. Dazu kann das Leitblech 26 zweiteilig ausgeführt sein und gegenseitig überlappt, so daß dies mittels angedeuteter Schrauben 31 und dem auf dem oberen Teil des Leitbleches 26 befindlichen Langlöchern in Pfeilrichtung B bewegbar ist. Das Leitblech 26 wird durch auf dem unteren Gehäuseteil 24 formschlüssig angeordneten Stützen 32, 33 gehalten. Die Stützen 32, 33, sind in Bewegungsrichtung C mittels einer Gewindespindel 34 und einer daran befestigten Handhabe, z. B. einer Rändelmutter 36 höhenverstellbar. Somit wird gleichzeitig das Leitblech 26 in dieser Bewegungsrichtung C verstellt. Das Leitblech 26 ist in Richtung seines zweiten Endes 37 rechtwinklig in Richtung unteres Gehäuseteil 24 abgewinkelt und reicht bis zum unteren Gehäuseteil 24. Das Leitblech 26 ist in Richtung C höhenverstellbar. Das Leitblech 26 ist derart abgewinkelt, daß sein zweites Ende 37 in einem Abstand d zum parallel verlaufenden Haltelement 17 verläuft, so daß ein Kanal 39 für die Abführeinrichtung gebildet wird, durch welchen eine Ableitung von Feucht- oder Farbpartikeln erfolgen kann. Am Ende diese Kanals 39 sind ein oder mehrere Abführstutzen 41 am unteren Gehäuseteil (24) angeordnet, welcher über nichtdargestellte Reinigungs- oder Filteranlage verbunden ist. Das Leitblech 26 weist in der Nähe der Düsen 14, 16 U - förmige Aussparungen 42 auf, durch welche die Sprühköpfe der Düsen 14, 16 hindurchragen. Die Einrichtungen 1, 2 werden stirnseitig durch die Seitenschilde 43, 44 begrenzt, die der Kontur der Walzen 4, 6 angepaßt sind.1 shows a schematic side view of a device according to the invention, which consists of a transmission device or droplet generator device, generally designated 1, for a droplet-capable medium and a discharge device or aerosol trap device, generally designated 2, for a droplet-capable medium. Both devices 1, 2 are housed together in a housing 3 which extends in the axial direction to two transfer rollers, which are designed as a receptor roller 4 and a smoothing roller 6 cooperating with it. The receptor roller 4 is connected to a plate cylinder 8 via a further transfer roller 7. The devices 1, 2 are arranged at an angle which can be in a range from three to 90 °. It is also possible to pivot the devices 1, 2 in the housing 3 about a vertical 11, so that a cylinder group arranged in mirror image to the vertical 11, analogous to that with the rollers 4, 6, 7 and the cylinder 8, also with a droplet capable Medium can be applied. The housing 3 is approximately U-shaped in cross section and is directed with its free edges 12, 13 against the outer surface of the smoothing roller 6 or the receptor roller 4. The distance of the free edges 12, 13, against the rollers 6, 4 is minimal and can be in the range from 0.5 to 25 mm. In the lower or rear part of the housing 3 there are a plurality of glands 14, 16, arranged in the axial direction, of the generator device 1, preferably flat jet nozzles, of which only two nozzles 14, 16 are shown in FIG. 2. The nozzles 14, 16 are form-fitting in a holding element 17, e.g. B. attached to an axially extending sheet metal strip. The nozzles 14, 16 are each connected to a solenoid valve 18 which controls the supply of dampening solutions via an electrical connection 19. The dampening solution is supplied via a connection 21 on the solenoid valve 18. The upper free edge 12 of the housing 3 which is U-shaped in cross section and extends in the axial direction towards the rollers 4, 6 can be pivoted with its subsequent upper housing part 22 about a hinge 23, so that after the upper housing part 22 has been swung forward, only the holding element 17 with the nozzles 14, 16 remains, which is attached to a lower housing part 24. The two devices 1, 2 are accommodated in the front part of the housing 3 which is open in the direction of the rollers 4, 6. Both devices 1, 2 are separated by a guide plate 26, which is arranged parallel to the housing parts 22, 24 and extends in the axial direction of the rollers 4, 6. An end 27 of the guide plate 26 which extends in the direction of the rollers 4, 6, with its edge 28 which extends in the axial direction to the rollers 4, 6, is short of the outer surface of the receptor roller 4 arranged. For this purpose, the guide plate 26 is arranged to be adjustable in the direction B on the rollers 4, 6, so that a gap f located between the edge 28 (FIG. 3) of the guide plate 26 and the outer surface of the receptor roller 4 has a size of approximately between 0.5 to 25 mm is adjustable. For this purpose, the guide plate 26 can be made in two parts and overlap one another, so that this can be moved in the direction of arrow B by means of indicated screws 31 and the elongated holes located on the upper part of the guide plate 26. The guide plate 26 is held by supports 32, 33 arranged in a form-fitting manner on the lower housing part 24. The supports 32, 33 are in the direction of movement C by means of a threaded spindle 34 and a handle attached thereto, for. B. a knurled nut 36 adjustable in height. Thus, the guide plate 26 is simultaneously adjusted in this direction of movement C. The guide plate 26 is angled at right angles in the direction of its second end 37 in the direction of the lower housing part 24 and extends to the lower housing part 24. The height of the guide plate 26 can be adjusted in the C direction. The baffle 26 is angled such that its second end 37 extends at a distance d from the parallel holding element 17, so that a channel 39 is formed for the discharge device, through which moisture or paint particles can be discharged. At the end of this channel 39, one or more discharge ports 41 are arranged on the lower housing part (24), which is connected via a cleaning or filter system (not shown). The guide plate 26 has U-shaped recesses 42 in the vicinity of the nozzles 14, 16, through which the spray heads of the nozzles 14, 16 protrude through. The devices 1, 2 are limited at the end by the side shields 43, 44, which are adapted to the contour of the rollers 4, 6.

Die in dem Gehäuse 3 angeordneten Einrichtungen 1, 2 sind bezüglich der Walzen 4, 6 so angeordnet, daß ein Sprühstrahl 46 der Düsen 14, 16 auf die Mantelfläche der Receptorwalze 4 gerichtet ist. Eine in Richtung der Walzen 4, 6 gerichtete Öffnung 47 der Abführeinrichtung 2 zielt auf eine Berührungslinie 55 zwischen der Receptorwalze 4 und der Glättungswalze 6 auf ihrer gesamten axialen Länge. Die Öffnung 47 weist eine im Querschnitt gesehene, lichte Weite e auf.The devices 1, 2 arranged in the housing 3 are arranged with respect to the rollers 4, 6 in such a way that a spray jet 46 from the nozzles 14, 16 is directed onto the outer surface of the receptor roller 4. An opening 47 of the discharge device 2 directed in the direction of the rollers 4, 6 aims at a line of contact 55 between the receptor roller 4 and the smoothing roller 6 over its entire axial length. The opening 47 has a clear width e seen in cross section.

Die Funktionsweise der Vorrichtung ist wie folgt:
Von den Düsen 14, 16 wird z. B. Feuchtmittel auf die sich in Uhrzeigerrichtung drehende Receptorwalze 4 aufgebracht und von dieser in Richtung Berührungslinie 55, der mit der sich im Gegenuhrzeigersinn drehenden Glättungswalze 6 gebildet wird, weitertransportiert. Durch das Aufbringen des Feuchtmittels entstehen Aerosole, also leichtflüchtige, nebelförmige Teilchen, die von der um die Receptorwalze 4 zirkulierenden Luftströmung in Drehrichtung der Receptorwalze 4 mitgerissen werden. Diese hinter der Kante 28 austretenden Teilchen werden durch die Öffnung 47 abgeführt. Dabei dient die Kante 28 des ersten Endes 27 des Leitbleches 26 strömungstechnisch als Abrißkante, so daß die flüchtigen Aerosole hinter der Kante 28 umgelenkt und abgeleitet werden. Die Luftströmungen der Glättwalze 6 und der Receptorwalze 4 werden im Walzeneinlaufspalt 48 auf Grund physikalischer Gegebenheiten in Richtung Abführeinrichtung 2 umgelenkt. Somit werden die leichtflüchtigen Teilchen durch die Öffnung 47 abgeführt. Dadurch werden bisher ungenutzte Partikel des Feuchtmittels zurückgewonnen. Dies trifft auch auf die im Gegenuhrzeigersinn drehende Glättungswalze 6 zu, welche zum Teil Aerosole wieder rückführt, welche nunmehr kontrolliert abgeführt werden können. Weiterhin werden über die Übertragungswalze 7 auf die Receptorwalze 4 Farbpartikel vom Plattenzylinder 8 zurückübertragen, welche bisher unkontrolliert in der Übertragungseinrichtung 1 umherschwebten und sich in der Nähe der Öffnungen der Düsen 14, 16 absetzen konnten. Diese Farbpartikel werden nunmehr ebenfalls abgesaugt.
The device works as follows:
From the nozzles 14, 16 z. B. dampening solution applied to the clockwise rotating receptor roller 4 and transported further by this in the direction of the contact line 55, which is formed with the counterclockwise rotating smoothing roller 6. The application of the dampening solution produces aerosols, that is to say volatile, mist-like particles, which are entrained in the direction of rotation of the receptor roller 4 by the air flow circulating around the receptor roller 4. These particles emerging behind the edge 28 are discharged through the opening 47. The edge 28 of the first end 27 of the guide plate 26 serves as a tear-off edge in terms of flow technology, so that the volatile aerosols are deflected behind the edge 28 and diverted away. The Air flows of the smoothing roller 6 and the receptor roller 4 are deflected in the roller inlet nip 48 due to physical conditions in the direction of the discharge device 2. The volatile particles are thus discharged through the opening 47. As a result, previously unused particles of the dampening solution are recovered. This also applies to the anti-clockwise smoothing roller 6, which partly recycles aerosols, which can now be removed in a controlled manner. Furthermore, color particles are transferred back from the plate cylinder 8 via the transfer roller 7 to the receptor roller 4, which previously hovered uncontrollably in the transfer device 1 and could settle near the openings of the nozzles 14, 16. These color particles are now also suctioned off.

Die in der Nähe der Receptorwalze 4 abzüglich eines Spaltes 29 befindliche Kante 28 des ersten Endes 27 des Leitbleches 26 kann verschiedene Querschnitte aufweisen, z. B. in Richtung des oberen Gehäuseteils 22 oder des unteren Gehäuseteils 24 abgewinkelt sein, scharfkantig oder rundkantig ausgeführt sein. Die Kante 28 kann auch mit einem Wulst versehen sein, der im Querschnitt gesehen kreisförmig ist mit einem Durchmesser, der der zwei- bis vierfachen Materialdichte des Endes 27 des Leitbleches 26 entspricht. Die Kante 28 kann auch rechtwinklig in einfacher Materialdicke ausgeführt sein.The edge 28 of the first end 27 of the guide plate 26 located in the vicinity of the receptor roller 4 minus a gap 29 can have different cross sections, e.g. B. be angled in the direction of the upper housing part 22 or the lower housing part 24, be sharp or rounded. The edge 28 can also be provided with a bead which, viewed in cross section, is circular with a diameter which corresponds to two to four times the material density of the end 27 of the guide plate 26. The edge 28 can also be designed at right angles in a simple material thickness.

Es ist auch möglich, statt der Sprühdüsen 14, 16 ein Schleuderfeuchtwerk oder ein Bürstenfeuchtwerk einzusetzen, um Feuchtmittel auf einen Plattenzylinder zu übertragen. Weiterhin ist es mit der erfindungsgemäßen Vorrichtung möglich, Reinigungsmittel auf Farbauftragswalzen, Farbreibzylinder, Farbübertragungswalzen und Gummituchzylinder aufzubringen. Darüberhinaus ist der Einsatz der erfindungsgemäßen Vorrichtung beim Auftrag von Farbe auf Walzen eines Farbwerkes möglich.It is also possible, instead of the spray nozzles 14, 16 use a centrifugal dampening system or a brush dampening system to transfer dampening solution to a plate cylinder. Furthermore, the device according to the invention makes it possible to apply cleaning agents to ink application rollers, ink rubbing cylinders, ink transfer rollers and blanket cylinders. In addition, the device according to the invention can be used when applying ink to the rollers of an inking unit.

Entsprechend der Darstellung nach Fig. 4 ist ein zweites Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung gezeigt. Hier ist in einem Gehäuse 3 nur die Übertragungseinrichtung 1 für tröpfchenfähige Medien, z. B. in Form eines Sprühfeuchtwerkes angeordnet. Das Gehäuse 3 besteht ebenfalls aus einem oberen und einem unteren Gehäuseteil 22, 24, wobei das obere Gehäuseteil 22 mittels eines Scharnieres 23 schwenkbar ist. Eine gehäusefeste Halterung 17 zur Aufnahme der Düse 16 mit dem dazugehörigen Magnetventil 18 ist unterhalb des oberen Gehäuseteils 22 abgewinkelt und dient dem oberen angelenkten Gehäuseteil 22 als Auflage. Auf dem oberen Gehäuseteil 22 ist eine insgesamt mit 49 bezeichnete Abführeinrichtung mit einem Gehäuse 50 aufgesetzt, welches parallel zur Übertragungseinrichtung 1 angeordnet ist. und ein im Querschnitt nach Fig. 4 gesehen, U - förmiges Profil aufweist, dessen freie, in Richtung auf die Mantelfläche der Walzen 4, 6 gerichtete Kanten 51, 52 abzüglich einem Spalt 29 bis zur Walzenmantelfläche reichen. Dabei zielt eine Öffnung 53 des Gehäuses 50 der Abführeinrichtungichtung 49 auf den Walzeneinlaufspalt 48 zwischen der Receptorwalze 4 und der Glättungswalze 6, so daß vorzugsweise die erste Kante 51 in die Nähe der Mantelfläche 6 und die zweite Kante 52 der Abführeinrichtung 49 in die Nähe der Mantelfläche der Receptorwalze 4 geführt ist. Die Öffnung 53 weist ebenfalls eine lichte Weite e auf. Ein Ende der freien Kante 52 der Abführeinrichtung 49 kann mit einem anderem bereits beschriebenen Profil versehen sein. Das Gehäuse 50 der Abführeinrichtung 49 ist auf dem oberen Gehäuseteil 22 der Übertragungseinrichtung 1 mittels einer symbolisch angedeuteten Schwalbenschwanzführung 54 kraft- und formschlüssig verbunden, so daß die Abführeinrichtung 49 in Pfeilrichtung B bewegbar ist. Im Gehäuse 50 der Abführeinrichtung 49 kann eine Kühleinrichtung 56, durch im Querschnitt angedeutete Kühlschlangen, eingearbeitet sein oder wie dargestellt, außen auf dem Gehäuse 50 aufgebracht sein, so daß die abgeführten Partikel kondensieren können. Die Abführeinrichtung 49 ist mit einer Ableitung 57 für das abzuführende, z. B. abzusaugende Medium versehen. Ansonsten treffen die Ausführungen des ersten Ausführungsbeispiels zu.4 shows a second exemplary embodiment of a device according to the invention. Here is in a housing 3 only the transmission device 1 for droplet media, z. B. arranged in the form of a spray dampening system. The housing 3 also consists of an upper and a lower housing part 22, 24, the upper housing part 22 being pivotable by means of a hinge 23. A housing-fixed holder 17 for receiving the nozzle 16 with the associated solenoid valve 18 is angled below the upper housing part 22 and serves as a support for the upper articulated housing part 22. On the upper housing part 22, a discharge device, generally designated 49, with a housing 50 is placed, which is arranged parallel to the transmission device 1. and, seen in cross section according to FIG. 4, has a U-shaped profile, the free edges 51, 52 of which, directed in the direction of the outer surface of the rollers 4, 6, minus a gap 29, extend to the outer surface of the roller. An opening 53 of the housing 50 of the discharge device device 49 is aimed at the roller inlet gap 48 between the receptor roller 4 and the smoothing roller 6, so that preferably the first edge 51 into the Near the outer surface 6 and the second edge 52 of the discharge device 49 is guided in the vicinity of the outer surface of the receptor roller 4. The opening 53 also has a clear width e. One end of the free edge 52 of the discharge device 49 can be provided with another profile already described. The housing 50 of the discharge device 49 is non-positively and positively connected on the upper housing part 22 of the transmission device 1 by means of a symbolically indicated dovetail guide 54, so that the discharge device 49 can be moved in the direction of arrow B. In the housing 50 of the discharge device 49, a cooling device 56 can be incorporated, by means of cooling coils indicated in cross section, or, as shown, can be applied on the outside of the housing 50, so that the discharged particles can condense. The discharge device 49 is provided with a derivative 57 for the discharge, for. B. provided suction medium. Otherwise, the explanations of the first exemplary embodiment apply.

Entsprechend einem weiteren Ausführungsbeispiel nach Fig. 5 ist eine Abführeinrichtung 58 vorgesehen, die aus einer auf dem oberen Gehäuseteil 22 angeordneten und parallel zu dieser verlaufenden Wanne 59 besteht, über welcher ein oder mehrere Kühlgeräte 61 angebracht sind, an welchen das überschüssige tropfenfähige Medium kondensiert, in die Wanne 59 abtropft und über die Ableitung 57 abgeführt wird. Es ist dann auch möglich, statt des Kühlgerätes 61 einen mit einem als Kathode oder Anode ausgebildeten Elektrode 62 in Form einer Metallplatte anzuordnen, an welcher sich das tröpfchenfähige Medium absetzt, sofern ein mit einer positiven oder negativen elektrischen Ladung versetztes Medium, z. B. Feuchtmittel durch die Übertragungseinrichtung 1, z. B. über die Düsen 14, 16 ausgebracht wird.According to a further exemplary embodiment according to FIG. 5, a discharge device 58 is provided, which consists of a trough 59 which is arranged on the upper housing part 22 and runs parallel to it and over which one or more cooling devices 61 are attached, to which the excess dripable medium condenses, drips into the tub 59 and is discharged via the discharge line 57. It is then also possible to replace the cooling device 61 with one designed as a cathode or anode Arrange electrode 62 in the form of a metal plate on which the droplet-capable medium settles, provided that a medium mixed with a positive or negative electrical charge, e.g. B. dampening solution by the transmission device 1, z. B. is applied via the nozzles 14, 16.

In einem weiteren Ausführungsbeispiel nach Fig. 6 ist eine Abführeinrichtung 63 vorgesehen, die eine analoge Funktion wie die in Fig. 4 gezeigte Abführeinrichtung 49 aufweist, die jedoch von der Übertragungseinrichtung 1 völlig getrennt angeordnet ist und wobei überschüssiges Medium aus einem Walzeneinlaufspalt 64 zwischen der Receptorwalze 4 und der Übertragungswalze 7 abgesaugt wird. Dabei ist die Übertragungseinrichtung 1 in Drehrichtung der Receptorwalze 4 gesehen, vor dem Walzeneinlaufspalt 64 angeordnet.In a further exemplary embodiment according to FIG. 6, a discharge device 63 is provided which has a function analogous to that of the discharge device 49 shown in FIG. 4, but which is arranged completely separately from the transmission device 1 and with excess medium from a roll inlet gap 64 between the receptor roll 4 and the transfer roller 7 is suctioned off. The transmission device 1 is seen in the direction of rotation of the receptor roller 4 and is arranged in front of the roller inlet gap 64.

Die Aerosol(Nebel-)Fangeinrichtung 2; 49; 58; 63 ist in einem Abstand f zum Umfang und in einer Lage um den Umfang der Receptorwalze 4, in Drehrichtung der Receptorwalze 4 gesehen, vor oder nach einer Berührungslinie 55 der Receptorwalze 4 mit einer, mit ihr zusammenwirkenden unmittelbar nächsten Walze 6; 7 angeordnet.The aerosol (mist) trap 2; 49; 58; 63 is at a distance f from the circumference and in a position around the circumference of the receptor roller 4, seen in the direction of rotation of the receptor roller 4, before or after a line of contact 55 of the receptor roller 4 with an immediately next roller 6 interacting with it; 7 arranged.

TeilelisteParts list

11
TröpfchenerzeugereinrichtungDroplet generator
22nd
Aerosol-FangeinrichtungAerosol trap
33rd
Gehäuse (1, 2)Housing (1, 2)
44th
ReceptorwalzeReceptor roller
55
--
66
GlättungswalzeSmoothing roller
77
ÜbertragungswalzeTransfer roller
88th
PlattenzylinderPlate cylinder
99
WaagerechteHorizontal
1010th
--
1111
Senkrechtevertical
1212th
Kante, freie (3)Free edge (3)
1313
Kante, freie (3)Free edge (3)
1414
Düsejet
1515
--
1616
Düsejet
1717th
Halteelement (16, 18)Holding element (16, 18)
1818th
Magnetventilmagnetic valve
1919th
Anschluß, elektrischer (18)Electrical connection (18)
2020th
--
2121
Anschluß FeuchtmittelConnection dampening solution
2222
Gehäuseteil, oberes (3)Upper housing part (3)
2323
Scharnierhinge
2424th
Gehäuseteil, unteres (3)Housing part, lower (3)
2525th
--
2626
LeitblechBaffle
2727
Ende (26), erstesEnd (26), first
2828
Kante (27)Edge (27)
2929
Spaltgap
3030th
--
3131
Schraube (26)screw (26)
3232
Stütze (26)Support (26)
3333
Stütze (26)Support (26)
3434
Gewindespindel (33)Lead screw (33)
3535
--
3636
Rändelmutter (34)Knurled Nut (34)
3737
Ende (26), zweitesEnd (26), second
3838
--
3939
Kanal (2)Channel (2)
4040
--
4141
Abführstutzen (24)Discharge pipe (24)
4242
Aussparung (26)Notch (26)
4343
Seitenschild (1, 2)Side plate (1, 2)
4444
Seitenschild (1, 2)Side plate (1, 2)
4545
--
4646
Sprühstrahl (14, 16)Spray jet (14, 16)
4747
Öffnung (2)Opening (2)
4848
Spaltgap
4949
AbführeinrichtungDischarge device
5050
Gehäuse (49)Housing (49)
5151
Kante freie (49)Edge free (49)
5252
Kante, freie (49)Free edge (49)
5353
Öffnung (49)Opening (49)
5454
Schwalbenschwanzführung (50, 3)Dovetail guide (50, 3)
5555
BerührungslinieContact line
5656
KühleinrichtungCooling device
5757
AbleitungDerivative
5858
AbführeinrichtungDischarge device
5959
WanneTub
6060
--
6161
Kühlgerät (58)Cooling unit (58)
6262
Elektrode (58)Electrode (58)
6363
AbführeinrichtungDischarge device
6464
Spaltgap
6565
--
6666
--
6767
AbführeinrichtungDischarge device
αα
Winkel (3, 9)Angle (3, 9)
BB
Bewegungsrichtung (26)Direction of movement (26)
CC.
Bewegungsrichtung (26)Direction of movement (26)
dd
Abstand (3, 37)Distance (3, 37)
ee
lichte Weite (47)clear width (47)
ff
Abstanddistance

Claims (6)

  1. A device for capturing stray aerosol produced by impacting droplets, generated in a device for generating liquid droplets, on a receptor roller, the device being arranged in the vicinity of the periphery of the receptor roller, and the receptor roller cooperating with at least one further - with respect to a common line of contact (55) immediately adjacent - roller (6; 7) which it supplies with a liquid coating, for use in a rotary printing machine, characterized in that the capturing device (2; 49; 58; 63) is arranged immediately before or after the line of contact (55) - as seen in the direction of rotation of the receptor roller (4) - and is aligned therewith.
  2. A device according to Claim 1, characterized in that a brush-type damping system, centrifugal damping system or spray-type damping system is provided to generate liquid droplets (1).
  3. A device according to Claim 1, characterized in that a spray system for printing ink is provided to generate liquid droplets (1).
  4. A device according to Claims 1 to 3, characterized in that the device for capturing (2; 39) stray aerosol (2; 39) is arranged before the line of contact (55), and in that it is constructed as an outlet channel (39; 53) leading away from the line of contact (55) and is connected with form fit to the device (1) for generating droplets.
  5. A device according to Claims 1 to 4, characterized in that the device for capturing aerosol (58) comprises a cooling apparatus (61) which is arranged above an outlet trough (59).
  6. A device according to Claims 1 to 5, characterized in that the device for capturing aerosol (58) comprises an electrode (62) which is constructed as a cathode or anode, is arranged above a trough (59) and on which the stray aerosol, provided with a positive or negative charge, deposits.
EP94100677A 1993-01-25 1994-01-19 Device for capturing vagrant aerosol in a rotary printing machine Expired - Lifetime EP0609693B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301950A DE4301950A1 (en) 1993-01-25 1993-01-25 Aerosol-deposit-prevention system in rotary printing press - has collector for stray aerosol generated by droplet impact on receptor roller
DE4301950 1993-01-25

Publications (2)

Publication Number Publication Date
EP0609693A1 EP0609693A1 (en) 1994-08-10
EP0609693B1 true EP0609693B1 (en) 1997-07-23

Family

ID=6478872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94100677A Expired - Lifetime EP0609693B1 (en) 1993-01-25 1994-01-19 Device for capturing vagrant aerosol in a rotary printing machine

Country Status (4)

Country Link
US (1) US5438923A (en)
EP (1) EP0609693B1 (en)
JP (1) JPH06255075A (en)
DE (2) DE4301950A1 (en)

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Also Published As

Publication number Publication date
DE59403414D1 (en) 1997-08-28
US5438923A (en) 1995-08-08
JPH06255075A (en) 1994-09-13
DE4301950A1 (en) 1994-07-28
EP0609693A1 (en) 1994-08-10

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