EP0802052B1 - Device for remoistening a printed web - Google Patents

Device for remoistening a printed web Download PDF

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Publication number
EP0802052B1
EP0802052B1 EP97104467A EP97104467A EP0802052B1 EP 0802052 B1 EP0802052 B1 EP 0802052B1 EP 97104467 A EP97104467 A EP 97104467A EP 97104467 A EP97104467 A EP 97104467A EP 0802052 B1 EP0802052 B1 EP 0802052B1
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EP
European Patent Office
Prior art keywords
housing
air
movement
stock web
section
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EP97104467A
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German (de)
French (fr)
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EP0802052A1 (en
Inventor
Karl-Heinz Reichel-Langer
Werner Kettl
Peter Schüller
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Baldwin Grafotec GmbH
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Baldwin Grafotec GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/02—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by dampening

Definitions

  • the invention relates to a device for rewetting a fresh printed and dried printing material web with one in a downstream area from the dryer, preferably in the area between Dryer and cooler, arranged, with an inlet slot and an outlet slit, through which the printing material web passes Housing in which the above and below the transport level Printing material web arranged, which can be acted upon by a dampening agent Spray nozzles are provided.
  • DE 44 05 332 A1 discloses a device of this type which is arranged between the dryer and the cooling device. At this known arrangement run the substrate in the area of the input and Exhaust slot crossing housing walls at its lower end free out. There is therefore a risk that the in the form of Splashes of liquid or mist on the walls and / or the liquid condensing on the walls from the lower ones Edges of the walls of the upper one crossing the printing material web Drains the housing area and reaches the printing material web. Such When the printing material web is moving, drops can mark on it to lead. In the event of a train stop, paper can be used Drops of printing material falling down to soften of the paper so that there is an increased risk of breakage when restarting consists.
  • Another disadvantage of the known arrangement is that that moisture in the form of liquid splashes over the web outlet slot and / or fog and / or steam can escape to the outside.
  • This Danger can be reduced by reducing the clear slot width reduce but not eliminate.
  • the slot width must not be too small, since the printing material web, caused by the application of liquid to flutter movements can not be excited to avoid damage may come into contact with the slot edges.
  • the known Arrangement can therefore lead to an undesirable liquid precipitation in the area and especially on the rollers of the downstream cooling device come, which negatively affects the cooling effect can influence.
  • the known arrangement therefore does not prove to be reliable and safe enough.
  • the drip catchers on the lower edges of the transverse walls of the upper one Housing area and the drainage of the liquid accumulating in the housing make sure that the printing material web only with the spray nozzles atomized liquid and not with large accumulations of liquid is applied, so that the printing material web only re-moistened, but is not contaminated or softened, which increases operational safety and improved the work result.
  • the drip catchers can expediently be designed as at least closed, tubes provided with at least one upper row of holes be, each with a textile material, preferably velvet, existing stocking are covered. These measures result in a particularly high reliability. Due to the capillary effect of the textile Material is the collected liquid through the holes in the pipes fed and thus initiated into this. The use of velvet results in particularly good absorbency.
  • the pipes with suction draft acting as drip catchers can expediently be used be acted upon. This will make the textile stocking absorbent supports and reliable drainage of the collected liquid ensured.
  • the housing two detachable, designed as upper and lower part Has housing parts, which in the mutually engaged state in the area the housing end faces are sealed against each other.
  • This can advantageously be stationary be arranged. Nevertheless, it is ensured that the parallel to the direction no liquid on the front of the housing can leak. Since the housing width is larger than the web width, can the liquid which precipitates on the end faces mentioned Walk up and down without affecting the track.
  • Another advantageous measure particularly in the case of between Dryer and the cooling device arranged remoistening device is preferable, may be that the housing above and below each a spray chamber containing the spray nozzles and one this nozzle-less downstream in the direction of the substrate Has condensation chamber.
  • the nozzleless condensation chamber can excess liquid not absorbed by the printing material web evaporate from the hot substrate. This steam can condense on the walls of the condensation chamber without a disturbance of this condensation by sprayed from the spray nozzles Liquid can take place. This therefore ensures that the environment stays dry. Because of these measures, it is more advantageous Way also possible with the help of the condensation chambers connected exhaust air chimneys for reliable pressure equalization care and to avoid overpressure inside the housing.
  • the housing of the rewetting device can expediently be by means of a holding device on the stand of the cooling device. This saves a separate stand.
  • the spray nozzles can be used for further training of the higher-level measures as two-substance nozzles to which liquid and air can be applied be trained. This ensures that comparatively small Liquid droplets are formed, but with a comparatively high Energy are applied.
  • the droplets mentioned therefore have one high penetration and can therefore be on the top and bottom easily penetrate the air layer adjacent to the substrate and reliably get onto the printing material web, so that this one experiences even rewetting.
  • a web-fed rotary printing press for example a web-fed offset printing press, passes through the printed substrate 1, as indicated in FIG. 1, one downstream of the last printing unit Dryer 2, in which the fresh pressure is dried by the application of heat and then a cooling device 3, in which the heated in the dryer Printing material web 1 is cooled.
  • the cooling device 3 consists in the Rule of cooling rollers 5 arranged in a cooling roller stand 4 Compensation for the material emitted in the dryer 2 from the printing material web Moisture is subjected to rewetting.
  • FIG. 1 there is one in FIG. 1 between the dryer 2 and the cooling device 3 arranged, through which the printing material web 1 passes Remoistening device 6 is provided.
  • This can be seen in FIG. 2 is, with above and below the substrate 1 arranged spray nozzles 7 for loading the printing material web with Provide remoistening liquid.
  • the spray nozzles 7 are in a housing that is below the transport level of the Printing substrate 1 arranged lower housing part 8 and one on this attachable, above the transport level of the substrate 1 arranged upper housing part 9.
  • the upper housing part 9 can be raised by means of a lifting device 10 lowerable. 1, indicated by broken lines in FIG. raised position of the upper housing part 9 is a simple and easy insertion of the substrate 1 possible.
  • the two housing parts are designed so that there is one of the substrate web on the entry side 1 assigned inlet slot 11 and one on the outlet side Print substrate web 1 assigned outlet slot 12 result. On the across for this purpose, ie extending in the direction of travel of the web End walls are the two housing parts in the superimposed Condition sealed against each other by means of a suitable sealing strip 13.
  • the lifting device 10 for lifting the upper housing part 9 consists in shown example from two arranged in parallelogram Swivel levers that can be actuated by means of a lifting cylinder.
  • the pivot lever and the lifting cylinder are, as best shown in Figure 2 is recognizable, recorded on side consoles 14 with which the stationary housing lower part 8 attached to the stand 4 of the cooling device 3 is.
  • the remoistening device 6 assign your own machine stand.
  • the nozzles 7 provided in the lower housing part 8 and upper housing part 9, those in the form of a transverse to the direction of the printing substrate 1 Arranged in rows and distributed evenly across the width, 3, are supplied from a supply station 15.
  • the Supply station 15 can be integrated in the remoistening device be.
  • the example shown is a provided by lines with supply station connected to the respective consumers.
  • nozzles 7 are designed as two-component nozzles with liquid, which is usually plain tap water can act, and air is applied. Accordingly, everyone is Nozzle 7 two supply lines 16, 17 for liquid and air assigned.
  • the mixing ratio between liquid and air is adjustable. For this purpose there are corresponding metering valves in the supply lines 18, 19 arranged. This enables the mixing ratio to be adjusted of liquid and air to the respective paper quality.
  • the spray nozzles 7 generate an aerosol-like spray. Equal time steam is generated.
  • the printing material web 1 leaving the dryer 2 has namely a comparatively high temperature of often more than 100 ° C, so that a large amount of the impinging on the printing material web 1 Liquid is evaporated.
  • an air jet 21 the opposite from above and below the transport direction of the printing material web 1 obliquely into the outlet gap 12 blows in and thus ensures that the printing material web 1 nothing can sweep along to the outside.
  • the air doctor devices 20 operate in advantageously contactless and at the same time ensure that the Outlet gap 12 can have a comparatively large clear width, so that the printing material web 1 also in the event of fluttering with the gap edges does not come into contact.
  • Air knife devices of the type mentioned above can also be used in the area of the inlet slot 11 may be provided. As a rule, however, this is not necessary because the layers of air entrained by the substrate already ensure that no liquid after through the inlet slot 11 can leak outside. It would also be conceivable in the area of the passage slots inner transverse walls of the housing such air doctor devices to provide. In normal cases, however, it is sufficient if, as shown in the Example, only the exit slot 12 air knife devices assigned.
  • the air doctor devices 20 each consist of one over the whole Slot width or width of the rewetting device 6 continuous Tube that is outside the outlet slot 12 obliquely above or obliquely arranged below this and provided with nozzle bores, their axis with respect to a solder on the substrate web level in the direction of travel is tilted forward so that the obliquely in the outlet gap 12th rays 21 result.
  • the nozzleless condensation chambers 24 result simultaneously a comparatively long one, the outlet slot 12 upstream Evaporation section, within the excess, from the substrate 1 not absorbed liquid can evaporate, causing the substrate web 1 heat is removed in a desired manner, which the downstream cooling device 3 can relieve.
  • Spraying takes place in the spray chambers 22. On the walls of the spray chamber Therefore, in addition to steam, mist and splashes of liquid also strike down, which can lead to droplets indicated at 26.
  • Condensation chambers 24 condense steam.
  • the in the condensation chambers 24 evaporating from the substrate 1 Steam condenses on the relatively cold chamber walls, where collections can form, which are also shown in FIG Droplets 26 are indicated. This also applies to the exhaust air chimneys 25. This are expediently led beyond the spray chambers 23, so that result in comparatively cold zones in which condensation favors and thus the air is dried before exiting into the environment.
  • the ceiling walls of the upper spray chamber 23 and Condensation chamber 24 are inclined obliquely, so that the attached forming droplets can run off without dripping.
  • the Lower housing part 8 is a mirror image of upper housing part 9, so that there are accordingly inclined floor surfaces.
  • the lower spray chamber 23 is in the deepest area with a bottom Provided output 27, which is connected to a drain line 28 to the Supply station 15 returns. As a result, the lower spray chamber 23 liquid running down to the supply station 15 returned.
  • the lower exhaust stack 25 is equipped with a Provided liquid outlet 27, which is connected to the drain line 28 , so that also on the walls of the lower condensation chamber 24th and the lower exhaust chimney 25 running down liquid Supply station 15 is returned.
  • the precipitation on the in the running direction of the substrate 1 itself extending walls of the upper housing part 9 can simply on the Pass the respective sealing strip downwards and so over the respective liquid outlet 27 are discharged because the housing is wider than the printing material web 1.
  • the precipitation on the across Running direction of the printing material web 1 extending walls of the Upper housing part 9 is caught on the lower wall edge in order dripping onto the printing material web 1 and thus its contamination and prevent softening if necessary.
  • Drip catcher 31 arranged on the respective associated wall Pick up and drain off the falling drops.
  • the drip catchers 31 can be seen as the lower edge of the assigned wall Gutters. In the example shown, the drip catchers 31 tubular and attached to the assigned wall, that there is a small groove between the wall and the pipe circumference.
  • the drip catchers 31 consist of how best FIG. 4 can be seen from an inner tube 32 on which a stocking 33 is made of textile material.
  • the tube 32 is with one or provided several rows of holes 34 which are arranged so that the tube 32nd is closed down. In the example shown there is an upper row of holes 34 provided.
  • the stocking 33 suitably consists of a close-knit Textile material, such as velvet. This is good absorbency guaranteed. Because of this absorbency, the extent of the so trained drip 31 collected liquid the holes of the Row of holes 34 fed through which the liquid enters the tube 32 and can be dissipated from this.
  • the tubes of the drip catcher 31 be subjected to suction, as in FIG. 4 by an arrow 35 is indicated.
  • the tubes 32 are closed at one end and connected at the other end to the suction port of a pump.
  • a liquid separator can be provided before or after the pump, whose output can open into the drain line 28, so that the over the drip 31 collected liquid to the supply station 35 is returned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Drying Of Solid Materials (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Rückbefeuchtung einer frisch bedruckten und getrockneten Bedruckstoffbahn mit einem in einem stromabwärts vom Trockner liegenden Bereich, vorzugsweise im Bereich zwischen Trockner und Kühleinrichtung, angeordneten, mit einem Einlaßschlitz und einem Auslaßschlitz versehenen, von der Bedruckstoffbahn durchlaufenen Gehäuse, in dem oberhalb und unterhalb der Transportebene der Bedruckstoffbahn angeordnete, mit Befeuchtungsmittel beaufschlagbare Sprühdüsen vorgesehen sind.The invention relates to a device for rewetting a fresh printed and dried printing material web with one in a downstream area from the dryer, preferably in the area between Dryer and cooler, arranged, with an inlet slot and an outlet slit, through which the printing material web passes Housing in which the above and below the transport level Printing material web arranged, which can be acted upon by a dampening agent Spray nozzles are provided.

Aus der DE 44 05 332 A1 ist eine Vorrichtung dieser Art bekannt, die zwischen Trockner und Kühleinrichtung angeordnet ist. Bei dieser bekannten Anordnung laufen die die Bedruckstoffbahn im Bereich des Ein- und Auslaßschlitzes überquerenden Gehäusewände an ihrem unteren Ende frei aus. Es besteht daher die Gefahr, daß die in Form von Flüssigkeitsspritzern oder Nebel auf die Wände gelangende Flüssigkeit und/oder die an den Wänden kondensierende Flüssigkeit von den unteren Kanten der die Bedruckstoffbahn überquerenden Wände des oberen Gehäusebereichs abtropft und auf die Bedruckstoffbahn gelangt. Derartige Tropfen können bei bewegter Bedruckstoffbahn zu Markierungen auf dieser führen. Im Falle eines Bahnstopps können auf die aus Papier bestehende Bedruckstoffbahn herabfallenden Flüssigkeitstropfen zu einem Aufweichen des Papiers führen, sodaß beim Wiederanfahren eine erhöhte Bruchgefahr besteht. Ein weiterer Nachteil der bekannten Anordnung ist darin zu sehen, daß über den Bahn-Auslaßschlitz Feuchtigkeit in Form von Flüssigkeitsspritzern und/oder Nebel und/oder Dampf nach außen gelangen kann. Diese Gefahr läßt sich zwar durch Herabsetzung der lichten Schlitzweite verringern, aber nicht beseitigen. In diesem Zusammenhang ist nämlich davon auszugehen, daß die Schlitzweite nicht zu klein sein darf, da die Bedruckstoffbahn, die durch die Flüssigkeitsbeaufschlagung zu Flatterbewegungen angeregt werden kann, zur Vermeidung einer Beschädigung nicht in Kontakt mit den Schlitzkanten kommen darf. Bei der bekannten Anordnung kann es daher zu einem unerwünschten Flüssigkeitsniederschlag in der Umgebung und insbesondere auf den Walzen der nachgeordneten Kühleinrichtung kommen, was den Kühleffekt negativ beeinflussen kann. Die bekannte Anordnung erweist sich demnach als nicht zuverlässig und sicher genug.DE 44 05 332 A1 discloses a device of this type which is arranged between the dryer and the cooling device. At this known arrangement run the substrate in the area of the input and Exhaust slot crossing housing walls at its lower end free out. There is therefore a risk that the in the form of Splashes of liquid or mist on the walls and / or the liquid condensing on the walls from the lower ones Edges of the walls of the upper one crossing the printing material web Drains the housing area and reaches the printing material web. Such When the printing material web is moving, drops can mark on it to lead. In the event of a train stop, paper can be used Drops of printing material falling down to soften of the paper so that there is an increased risk of breakage when restarting consists. Another disadvantage of the known arrangement is that that moisture in the form of liquid splashes over the web outlet slot and / or fog and / or steam can escape to the outside. This Danger can be reduced by reducing the clear slot width reduce but not eliminate. In this context is namely assume that the slot width must not be too small, since the printing material web, caused by the application of liquid to flutter movements can not be excited to avoid damage may come into contact with the slot edges. With the known Arrangement can therefore lead to an undesirable liquid precipitation in the area and especially on the rollers of the downstream cooling device come, which negatively affects the cooling effect can influence. The known arrangement therefore does not prove to be reliable and safe enough.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Vorrichtung gattungsgemäßer Art mit einfachen und kostengünstigen Mitteln so zu verbessern, daß eine hohe Störungs- und Verschmutzungsfreiheit erreicht werden.Proceeding from this, it is therefore the object of the present invention a device of the generic type with simple and inexpensive Means to improve so that a high level of interference and pollution can be achieved.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß an den Unterkanten der die Transportebene der Bedruckstoffbahn überquerenden Wände des oberen Gehäusebereichs Tropfenfänger angeordnet sind, daß die in den Tropfenfängern und im unteren Gehäusebereich anfallende Flüssigkeit abführbar ist und daß zumindest im Berich des Austrittsschlitzes bezüglich der Transportebene der Bedruckstoffbahn einander gegenüberliegende, mit Druckluft beaufschlagbare Luftrakeleinrichtungen vorgesehen sind.This object is achieved in that on the lower edges that crossing the transport plane of the printing material web Walls of the upper housing drip are arranged that that accumulating in the drip catchers and in the lower housing area Liquid can be removed and that at least in the area of the outlet slot with respect to the transport plane of the printing material web, Air doctor devices can be supplied with compressed air are.

Die Tropfenfänger an den Unterkanten der Querwände des oberen Gehäusebereichs und die Drainage der im Gehäsue anfallenden Flüssigkeit stellen sicher, daß die Bedruckstoffbahn nur mit mittels der Sprühdüsen zerstäubter Flüssigkeit und nicht mit größeren Flüssigkeitsansammlungen beaufschlagt wird, sodaß die Bedruckstoffbahn lediglich nachbefeuchtet, aber nicht verschmutzt oder aufgeweicht wird, was die Betriebssicherheit erhöht und das Arbeitsergebnis verbessert. Diese Vorteile werden durch die dem Auslaßschlitz zugeordneten Luftrakeleinrichtungen noch unterstützt. Diese arbeiten in vorteilhafter Weise berührungslos und ermöglichen eine große lichte Weite des Auslaßschlitzes, sodaß eine Beschädigung der Bahn, auch wenn diese sehr stark aus der ideellen Transportebene ausgelenkt wird, unterbleibt. Dennoch wird zuverlässig verhindert, daß Feuchtigkeit in Form von Flüssigkeitsspritzern, Nebel oder Dampf von der mit hoher Geschwindigkeit bewegten Bedruckstoffbahn mit nach außen gerissen werden kann. Eine Beaufschlagung der Umgebung und eventuell nachgeordneter Kühlwalzen mit Flüssigkeit ist damit wirksam unterbunden.The drip catchers on the lower edges of the transverse walls of the upper one Housing area and the drainage of the liquid accumulating in the housing make sure that the printing material web only with the spray nozzles atomized liquid and not with large accumulations of liquid is applied, so that the printing material web only re-moistened, but is not contaminated or softened, which increases operational safety and improved the work result. These are the benefits of air doctor devices associated with the outlet slot are still supported. These work in an advantageous manner without contact and enable one large clear width of the outlet slot, so that damage to the Railway, even if this is very much from the ideal transport level is deflected, does not occur. Nevertheless, it is reliably prevented that Moisture in the form of liquid splashes, mist or steam from the Printing material web moved at high speed with outwards can be torn. An exposure to the environment and possibly Downstream chill rolls with liquid are effectively prevented.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben.Advantageous refinements and expedient training of the parent Measures are specified in the subclaims.

Zweckmäßig können die Tropfenfänger als zumindest nach unten geschlossene, zumindest mit einer oberen Lochreihe versehene Rohre ausgebildet sein, die jeweils mit einem aus textilem Material, vorzugsweise Samt, bestehenden Strumpf überzogen sind. Diese Maßnahmen ergeben eine besonders hohe Zuverlässigkeit. Aufgrund der Kapilarwirkung des textilen Materials wird die aufgefangene Flüssigkeit den Löchern der Rohre zugeführt und so in diese eingeleitet. Die Verwendung von Samt ergibt in diesem Zusammenhang eine besonders gute Saugfähigkeit.The drip catchers can expediently be designed as at least closed, tubes provided with at least one upper row of holes be, each with a textile material, preferably velvet, existing stocking are covered. These measures result in a particularly high reliability. Due to the capillary effect of the textile Material is the collected liquid through the holes in the pipes fed and thus initiated into this. The use of velvet results in particularly good absorbency.

Zweckmäßig können die als Tropfenfänger fungierenden Rohre mit Saugzug beaufschlagbar sein. Hierdurch wird die Saugwirkung des textilen Strumpfes untersützt und eine zuverlässige Drainage der aufgefangenen Flüssigkeit sichergestellt.The pipes with suction draft acting as drip catchers can expediently be used be acted upon. This will make the textile stocking absorbent supports and reliable drainage of the collected liquid ensured.

Eine weitere vorteilhafte Maßnahme kann darin bestehen, daß das Gehäuse zwei voneinander abhebbare, als Oberteil und Unterteil ausgebildete Gehäuseteile aufweist, die im aneinander angestellten Zustand im Bereich der Gehäusestirnseiten gegeneinander abgedichtet sind. Hierbei ist es möglich, das Oberteil zur Erleichterung des Bahneinzugs einfach vom Unterteil abzuheben. Dieses kann in vorteilhafter Weise stationär angeordnet sein. Dennoch ist sichergestellt, daß an den parallel zur Laufrichtung der Bahn verlaufenden Gehäusestirnseiten keine Flüssigkeit austreten kann. Da die Gehäusebreite größer als die Bahnbreite ist, kann die an den genannten Stirnseiten sich niederschlagende Flüssigkeit von oben nach unten durchlaufen, ohne die Bahn zu beeinträchtigen. Another advantageous measure can be that the housing two detachable, designed as upper and lower part Has housing parts, which in the mutually engaged state in the area the housing end faces are sealed against each other. Here it is possible to easily remove the top from the web Lift off the lower part. This can advantageously be stationary be arranged. Nevertheless, it is ensured that the parallel to the direction no liquid on the front of the housing can leak. Since the housing width is larger than the web width, can the liquid which precipitates on the end faces mentioned Walk up and down without affecting the track.

Eine weitere vorteilhafte Maßnahme, die besonders bei zwischen dem Trockner und der Kühleinrichtung angeordneter Rückbefeuchtungsvorrichtung zu bevorzugen ist, kann darin bestehen, daß das Gehäuse oben und unten jeweils eine die Sprühdüsen enthaltende Sprühkammer und eine dieser in Laufrichtung der Bedruckstoffbahn nachgeordnete, düsenlose Kondensationskammer aufweist. In der düsenlosen Kondensationskammer kann überschüssige, von der Bedruckstoffbahn nicht aufgenommene Flüssigkeit von der heißen Bedruckstoffbahn abdampfen. Dieser Dampf kann sich an den Wänden der Kondensationskammer niederschlagen, ohne daß eine Störung dieser Kondensation durch von den Sprühdüsen eingesprühte Flüssigkeit erfolgen kann. Hierdurch wird daher sichergestellt, daß die Umgebung trocken bleibt. Aufgrund dieser Maßnahmen ist es in vorteilhafter Weise auch möglich, mit Hilfe von an die Kondensationskammern angeschlossenen Abluftkaminen für einen zuverlässigen Druckausgleich zu sorgen und einen Überdruck im Inneren des Gehäuses zu vermeiden.Another advantageous measure, particularly in the case of between Dryer and the cooling device arranged remoistening device is preferable, may be that the housing above and below each a spray chamber containing the spray nozzles and one this nozzle-less downstream in the direction of the substrate Has condensation chamber. In the nozzleless condensation chamber can excess liquid not absorbed by the printing material web evaporate from the hot substrate. This steam can condense on the walls of the condensation chamber without a disturbance of this condensation by sprayed from the spray nozzles Liquid can take place. This therefore ensures that the environment stays dry. Because of these measures, it is more advantageous Way also possible with the help of the condensation chambers connected exhaust air chimneys for reliable pressure equalization care and to avoid overpressure inside the housing.

Zweckmäßig kann das Gehäuse der Rückbefeuchtungvorrichtung mittels einer Halteeinrichtung am Ständer der Kühleinrichtung aufgenommen sein. Hierdurch wird ein eigener Ständer eingespart.The housing of the rewetting device can expediently be by means of a holding device on the stand of the cooling device. This saves a separate stand.

In weiterer Fortbildung der übergeordneten Maßnahmen können die Sprühdüsen als mit Flüssigkeit und Luft beaufschlagbare Zweistoffdüsen ausgebildet sein. Hierbei ist sichergestellt, daß vergleichsweise kleine Flüssigkeitströfpchen gebildet werden, die aber mit vergleichsweise hoher Energie beaufschlagt werden. Die genannten Tröpfchen besitzen daher eine hohe Durchschlagskraft und können daher die an der Ober- und Unterseite der Bedruckstoffbahn anliegende Luftschicht ohne weiteres durchschlagen und zuverlässig auf die Bedruckstoffbahn gelangen, sodaß diese eine gleichmäßige Rückbefeuchtung erfährt.The spray nozzles can be used for further training of the higher-level measures as two-substance nozzles to which liquid and air can be applied be trained. This ensures that comparatively small Liquid droplets are formed, but with a comparatively high Energy are applied. The droplets mentioned therefore have one high penetration and can therefore be on the top and bottom easily penetrate the air layer adjacent to the substrate and reliably get onto the printing material web, so that this one experiences even rewetting.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den restlichen Unteransprüchen angegeben und aus der nachstehenden, anhand der Zeichnung erfolgenden Beispielsbeschreibung entnehmbar.Further advantageous refinements and practical training of overriding measures are in the remaining subclaims specified and from the following, based on the drawing Example description can be removed.

In der Zeichnung zeigen:

Figur 1
eine Seitenansicht einer zwischen Trockner und Kühleinrichtung einer Rotationsdruckmaschine angeordneten, erfindungsgemäßen Rückbefeuchtungsvorrichtung,
Figur 2
eine Frontansicht der erfindungsgemäßen Rückbefeuchtungsvorrichtung gemäß Figur 1,
Figur 3
einen Schnitt durch die erfindungsgemäße Rückbefeuchtungsvorrichtung und
Figur 4
eine Teilansicht eines Tropfenfängerrohrs der erfindungsgemäßen Rückbefeuchtungsvorrichtung.
The drawing shows:
Figure 1
2 shows a side view of a remoistening device according to the invention arranged between the dryer and cooling device of a rotary printing press,
Figure 2
2 shows a front view of the rewetting device according to the invention according to FIG. 1,
Figure 3
a section through the rewetting device according to the invention and
Figure 4
a partial view of a drip tube of the rewetting device according to the invention.

Bei einer Rollenrotationsdruckmaschine, beispielsweise einer Rollenrotations-Offsetdruckmaschine, durchläuft die bedruckte Bedruckstoffbahn 1, wie in Figur 1 angedeutet ist, einen dem letzen Druckwerk nachgeordneten Trockner 2, in welchem der frische Druck durch Wärmezufuhr getrocknet wird, und danach eine Kühleinrichtung 3, in welcher die im Trockner erhitzte Bedruckstoffbahn 1 abgekühlt wird. Die Kühleinrichtung 3 besteht in der Regel aus in einem Kühlwalzenständer 4 angeordneten Kühlwalzen 5. Zum Ausgleich der im Trockner 2 von der Bedruckstoffbahn abgegebenen Feuchtigkeit wird diese einer Rückbefeuchtung unterzogen.In a web-fed rotary printing press, for example a web-fed offset printing press, passes through the printed substrate 1, as indicated in FIG. 1, one downstream of the last printing unit Dryer 2, in which the fresh pressure is dried by the application of heat and then a cooling device 3, in which the heated in the dryer Printing material web 1 is cooled. The cooling device 3 consists in the Rule of cooling rollers 5 arranged in a cooling roller stand 4 Compensation for the material emitted in the dryer 2 from the printing material web Moisture is subjected to rewetting.

Hierzu ist eine in Figur 1 zwischen dem Trockner 2 und der Kühleinrichtung 3 angeordnete, von der Bedruckstoffbahn 1 durchlaufene Rückbefeuchtungsvorrichtung 6 vorgesehen. Diese ist, wie aus Figur 2 entnehmbar ist, mit oberhalb und unterhalb der Bedruckstoffbahn 1 angeordneten Sprühdüsen 7 zur Beaufschlagung der Bedruckstoffbahn mit Rückbefeuchtungsflüssigkeit versehen. Die Sprühdüsen 7 befinden sich in einem Gehäuse, das ein unterhalb der Transportebene der Bedruckstoffbahn 1 angeordnetes Gehäuseunterteil 8 und ein auf dieses aufsetzbares, oberhalb der Transportebene der Bedruckstoffbahn 1 angeordnetes Gehäuseoberteil 9 aufweist.For this purpose, there is one in FIG. 1 between the dryer 2 and the cooling device 3 arranged, through which the printing material web 1 passes Remoistening device 6 is provided. This can be seen in FIG. 2 is, with above and below the substrate 1 arranged spray nozzles 7 for loading the printing material web with Provide remoistening liquid. The spray nozzles 7 are in a housing that is below the transport level of the Printing substrate 1 arranged lower housing part 8 and one on this attachable, above the transport level of the substrate 1 arranged upper housing part 9.

Das Gehäuseoberteil 9 ist mittels einer Hubeinrichtung 10 anhebbar und absenkbar. In der in Figur 1 mit unterbrochenen Linien angedeuteten, angehobenen Stellung des Gehäuseoberteils 9 ist ein einfacher und bequemer Einzug der Bedruckstoffbahn 1 möglich. Die beiden Gehäuseteile sind so ausgebildet, daß sich an der Eintrittsseite ein der Bedruckstoffbahn 1 zugeordneter Einlaßschlitz 11 und an der Austrittsseite ein der Bedruckstoffbahn 1 zugeordneter Auslaßschlitz 12 ergeben. An den quer hierzu verlaufenden, also in Laufrichtung der Bahn sich erstreckenden Stirnwänden sind die beiden Gehäuseteile im aufeinander aufgesetzten Zustand mittels einer geeigneten Dichtleiste 13 gegeneinander abgedichtet.The upper housing part 9 can be raised by means of a lifting device 10 lowerable. 1, indicated by broken lines in FIG. raised position of the upper housing part 9 is a simple and easy insertion of the substrate 1 possible. The two housing parts are designed so that there is one of the substrate web on the entry side 1 assigned inlet slot 11 and one on the outlet side Print substrate web 1 assigned outlet slot 12 result. On the across for this purpose, ie extending in the direction of travel of the web End walls are the two housing parts in the superimposed Condition sealed against each other by means of a suitable sealing strip 13.

Die Hubeinrichtung 10 zum Anheben des Gehäuseoberteils 9 besteht im dargestellten Beispiel aus zwei parallelogrammartig angeordneten Schwenkhebeln, die mittels eines Hubzylinders betätigbar sind. Die Schwenkhebel und der Hubzylinder sind, wie am besten aus Figur 2 erkennbar ist, auf seitlichen Konsolen 14 aufgenommen, mit denen das stationäre Gehäuseunterteil 8 am Ständer 4 der Kühleinrichtung 3 befestigt ist. Es wäre aber auch ohne weiteres denkbar, der Rückbefeuchtungsvorrichtung 6 einen eigenen Maschinenständer zuzuordnen.The lifting device 10 for lifting the upper housing part 9 consists in shown example from two arranged in parallelogram Swivel levers that can be actuated by means of a lifting cylinder. The The pivot lever and the lifting cylinder are, as best shown in Figure 2 is recognizable, recorded on side consoles 14 with which the stationary housing lower part 8 attached to the stand 4 of the cooling device 3 is. However, it would also be easily conceivable for the remoistening device 6 assign your own machine stand.

Die im Gehäuseunterteil 8 und Gehäuseoberteil 9 vorgesehenen Düsen 7, die in Form einer quer zur Laufrichtung der Bedruckstoffbahn 1 gerichteten Reihe angeordnet und gleichmäßig über die Breite verteilt sein können, werden, wie Figur 3 zeigt, von einer Versorgungstation 15 aus versorgt. Die Versorgungsstation 15 kann in die Rückbefeuchtungsvorrichtung integriert sein. Dem dargestellten Beispiel liegt eine beigestellte, durch Leitungen mit den jeweiligen Verbrauchern verbundene Versorgungsstation zugrunde. Die Düsen 7 sind im dargestellten Beispiel als Zweistoffdüsen ausgebildet, die mit Flüssigkeit, bei der es sich in der Regel um einfaches Leitungswasser handeln kann, und Luft beaufschlagt werden. Dementsprechend sind jeder Düse 7 zwei Versorgungsleitungen 16,17 für Flüssigkeit und Luft zugeordnet. Das Mischungsverhältnis zwischen Flüssigkeit und Luft ist einstellbar. Hierzu sind in den Versorgungsleitungen entsprechende Dosierventile 18, 19 angeordnet. Dies ermöglicht eine Anpassung des Mischungsverhältnisses von Flüssigkeit und Luft an die jeweilige Papierqualität.The nozzles 7 provided in the lower housing part 8 and upper housing part 9, those in the form of a transverse to the direction of the printing substrate 1 Arranged in rows and distributed evenly across the width, 3, are supplied from a supply station 15. The Supply station 15 can be integrated in the remoistening device be. The example shown is a provided by lines with supply station connected to the respective consumers. The In the example shown, nozzles 7 are designed as two-component nozzles with liquid, which is usually plain tap water can act, and air is applied. Accordingly, everyone is Nozzle 7 two supply lines 16, 17 for liquid and air assigned. The mixing ratio between liquid and air is adjustable. For this purpose there are corresponding metering valves in the supply lines 18, 19 arranged. This enables the mixing ratio to be adjusted of liquid and air to the respective paper quality.

Die Verwendung von Zweistoffdüsen stellt sicher, daß kleine Flüssigkeitströfchen entstehen, die nicht nur gleichmäßig über der Breite der Bedruckstoffbahn 1 verteilt werden, sondern auch mit hoher Energie beaufschlagt werden und dementsprechend eine hohe Durchschlagskraft besitzen und damit zuverlässig auf die Bedruckstoffbahn 1 gelangen. In diesem Zusammenhang ist nämlich davon auszugehen, daß die mit hoher Geschwindigkeit bewegte Bedruckstoffbahn 1 an ihre Ober- und Unterseite sich anlegende Luftschichten mitreißt, die von den Flüssigkeitströpfchen durchschlagen werden müssen, um eine zuverlässige Rückbefeuchtung der Bedruckstoffbahn 1 zu gewährleisten.The use of two-fluid nozzles ensures that small Liquid droplets are created that are not only even across the width of the Printing material web 1 are distributed, but also with high energy be applied and accordingly a high penetration own and thus reliably get onto the substrate 1. In In this context it can be assumed that those with high Speed moving substrate 1 to its top and bottom entraining layers of air entrained by the liquid droplets must be penetrated in order to reliably rewet the Ensure substrate 1.

Die Sprühdüsen 7 erzeugen einen aerosolartigen Sprühnebel. Gleichzeit entsteht Dampf. Die den Trockner 2 verlassende Bedruckstoffbahn 1 besitzt nämlich eine vergleichsweise hohe Temperatur von vielfach über 100° C, sodaß eine große Menge der auf die Bedruckstoffbahn 1 auftreffenden Flüssigkeit verdampft wird. Um zu verhindern, daß durch die bewegte Bedruckstoffbahn 1 bzw. durch die von dieser mitgerissenen Luftschichten Nebel und/oder Dampf aus der durch das Gehäuseunterteil 8 und Gehäuseoberteil 9 gebildeten, von der Bedruckstoffbahn 1 durchfahrenen Umhausung herausgeführt werden, sind am Auslaßschlitz 12 bezüglich der Transportebene der Bedruckstoffbahn 1 einander gegenüberliegende Luftrakeleinrichtungen 20 vorgesehen. Diese erzeugen über der ganzen Breite des Auslaßspalts 12 einen Luftstrahl 21, der von oben bzw. unten entgegen der Transportrichtung der Bedruckstoffbahn 1 schräg in den Auslaßspalt 12 hineinbläst und damit sicherstellt, daß die Bedruckstoffbahn 1 nichts mit nach außen mitreißen kann. Die Luftrakeleinrichtungen 20 arbeiten in vorteilhafter Weise berührungslos und stellen gleichzeitig sicher, daß der Auslaßspalt 12 eine vergleichsweise große lichte Weite aufweisen kann, sodaß die Bedruckstoffbahn 1 auch im Falle eines Flatterns mit den Spaltkanten nicht in Berühung kommt.The spray nozzles 7 generate an aerosol-like spray. Equal time steam is generated. The printing material web 1 leaving the dryer 2 has namely a comparatively high temperature of often more than 100 ° C, so that a large amount of the impinging on the printing material web 1 Liquid is evaporated. To prevent moving through Printing material web 1 or through the air layers entrained by it Mist and / or steam from through the lower housing part 8 and upper housing part 9 formed, traversed by the printing material web 1 Housing are brought out at the outlet slot 12 with respect to Transport plane of the substrate 1 opposite to each other Air doctor devices 20 are provided. These generate all over Width of the outlet gap 12 an air jet 21, the opposite from above and below the transport direction of the printing material web 1 obliquely into the outlet gap 12 blows in and thus ensures that the printing material web 1 nothing can sweep along to the outside. The air doctor devices 20 operate in advantageously contactless and at the same time ensure that the Outlet gap 12 can have a comparatively large clear width, so that the printing material web 1 also in the event of fluttering with the gap edges does not come into contact.

Luftrakeleinrichtungen vorstehend erwähnter Art können auch im Bereich des Einlaßschlitzes 11 vorgesehen sein. In der Regel ist dies jedoch nicht notwendig, da die von der Bedruckstoffbahn mitgerissenen Luftschichten bereits dafür sorgen, daß über den Einlaßschlitz 11 keine Flüssigkeit nach außen austreten kann. Ebenso wäre es denkbar, im Bereich der Durchtrittsschlitze innerer Querwände des Gehäuses derartige Luftrakeleinrichtungen vorzusehen. Im Normalfall genügt es jedoch, wenn, wie im dargestellten Beispiel, lediglich dem Austrittsschlitz 12 Luftrakeleinrichtuungen zugeordnet sind.Air knife devices of the type mentioned above can also be used in the area of the inlet slot 11 may be provided. As a rule, however, this is not necessary because the layers of air entrained by the substrate already ensure that no liquid after through the inlet slot 11 can leak outside. It would also be conceivable in the area of the passage slots inner transverse walls of the housing such air doctor devices to provide. In normal cases, however, it is sufficient if, as shown in the Example, only the exit slot 12 air knife devices assigned.

Die Luftrakeleinrichtungen 20 bestehen jeweils aus einem über die ganze Schlitzbreite bzw. Breite der Rückbefeuchtungsvorrichtung 6 durchgehenden Rohr, das außerhalb des Auslaßschlitzes 12 schräg oberhalb bzw. schräg unterhalb von diesem angeordnet und mit Düsenbohrungen versehen ist, deren Achse gegenüber einem Lot auf die Bedruckstoffbahnebene in Laufrichtung nach vorne gekippt ist, sodaß sich die schräg in den Auslaßspalt 12 hineingerichteten Strahlen 21 ergeben.The air doctor devices 20 each consist of one over the whole Slot width or width of the rewetting device 6 continuous Tube that is outside the outlet slot 12 obliquely above or obliquely arranged below this and provided with nozzle bores, their axis with respect to a solder on the substrate web level in the direction of travel is tilted forward so that the obliquely in the outlet gap 12th rays 21 result.

Um die Luftrakeleinrichtungen 20 zu entlasten, sind das Gehäuseunterteil 8 und Gehäuseoberteil 9, wie Figur 3 weiter zeigt, jeweils durch eine innere Querwand 22 in zwei Kammern unterteilt, nämlich eine eingangsseitige, die Sprühdüsen 7 aufnehmende Sprühkammer 23 und eine dieser nachgeordnete, düsenlose Kondensationskammer 24. Durch die Trennwand 22 wird verhindert, daß die Luftrakeleinrichtungen 20 direkt mit von den Sprühdüsen 7 erzeugten Sprühstrahlen und Flüssigkeitsspritzern etc. beaufschlagt werden. Die düsenlosen Kondensationskammern 24 ergeben gleichzeitig eine vergleichsweise lange, dem Auslaßschlitz 12 vorgeordnete Abdampfstrecke, innerhalb der überschüssige, von der Bedruckstoffbahn 1 nicht aufgenommene Flüssigkeit abdampfen kann, wodurch der Bedruckstoffbahn 1 in erwünschter Weise Wärme entzogen wird, was die nachgeordnete Kühleinrichtung 3 entlasten kann. Um die Bildung eines Überdurcks im Gehäuseinneren zu vermeiden sind von den Kondensationskammern 24 nach oben bzw. unten abgehende Abluftkamine 25 vorgesehen.In order to relieve the air doctor devices 20, the lower housing part 8 and upper housing part 9, as shown in Figure 3, each by an inner Cross wall 22 divided into two chambers, namely an input side, the Spray nozzle 23 receiving spray nozzles 23 and a downstream, nozzleless condensation chamber 24 prevents the air doctor devices 20 directly from the spray nozzles 7 generated spray jets and liquid splashes etc. applied become. The nozzleless condensation chambers 24 result simultaneously a comparatively long one, the outlet slot 12 upstream Evaporation section, within the excess, from the substrate 1 not absorbed liquid can evaporate, causing the substrate web 1 heat is removed in a desired manner, which the downstream cooling device 3 can relieve. To form a Overpressure inside the housing should be avoided by the condensation chambers 24 upward or downward exhaust air chimneys 25 are provided.

In den Sprühkammern 22 wird gesprüht. An den Wänden der Sprühkammer 23 schlagen sich daher neben Dampf auch Nebel und Flüssigkeitsspritzer nieder, was zu bei 26 angedeuteten Tröpfchen führen kann. In den Kondensationskammern 24 findet eine Kondensation von Dampf statt. Der in den Kondensationskammern 24 von der Bedruckstoffbahn 1 abdampfende Dampf schlägt sich an den vergleichsweise kalten Kammerwänden nieder, wobei sich Ansammlungen bilden können, die in Figur 3 ebenfalls durch Tröfpchen 26 angedeutet sind. Dies gilt auch für die Abluftkamine 25. Diese sind zweckmäßig über die Sprühkammern 23 hinausgeführt, sodaß sich vergleichsweise kalte Zonen ergeben, in denen die Kondensation begünstigt ist und damit die Luft vor dem Austritt in die Umgebung getrocknet wird.Spraying takes place in the spray chambers 22. On the walls of the spray chamber Therefore, in addition to steam, mist and splashes of liquid also strike down, which can lead to droplets indicated at 26. In the Condensation chambers 24 condense steam. The in the condensation chambers 24 evaporating from the substrate 1 Steam condenses on the relatively cold chamber walls, where collections can form, which are also shown in FIG Droplets 26 are indicated. This also applies to the exhaust air chimneys 25. This are expediently led beyond the spray chambers 23, so that result in comparatively cold zones in which condensation favors and thus the air is dried before exiting into the environment.

Die deckenseitigen Wände der oberen Sprühkammer 23 und Kondensationskammer 24 sind schräg geneigt, sodaß die hieran sich bildenden Tröpfchen ablaufen können, ohne abzutropfen. Das Gehäuseunterteil 8 ist spiegelbildlich zum Gehäuseoberteil 9 ausgebildet, sodaß sich hier dementsprechend geneigte Bodenflächen ergeben. Die untere Sprühkammer 23 ist im tiefsten Bereich mit einem bodenseitigen Ausgang 27 versehen, der mit einer Ablaufleitung 28 verbunden ist, die zur Versorgungsstation 15 zurückführt. Hierdurch wird an den Wänden der unteren Sprühkammer 23 herunterlaufende Flüssigkeit zur Versorgungsstation 15 zurückgeführt. Ebenso ist der untere Abluftkamin 25 mit einem Flüssigkeitsausgang 27 versehen, der mit der Ablaufleitung 28 verbunden ist, sodaß auch die an den Wänden der unteren Kondensationskammer 24 und des unteren Abluftkamins 25 herunterlaufende Flüssigkeit zur Versorgungsstation 15 zurückgeführt wird.The ceiling walls of the upper spray chamber 23 and Condensation chamber 24 are inclined obliquely, so that the attached forming droplets can run off without dripping. The Lower housing part 8 is a mirror image of upper housing part 9, so that there are accordingly inclined floor surfaces. The lower spray chamber 23 is in the deepest area with a bottom Provided output 27, which is connected to a drain line 28 to the Supply station 15 returns. As a result, the lower spray chamber 23 liquid running down to the supply station 15 returned. Likewise, the lower exhaust stack 25 is equipped with a Provided liquid outlet 27, which is connected to the drain line 28 , so that also on the walls of the lower condensation chamber 24th and the lower exhaust chimney 25 running down liquid Supply station 15 is returned.

Der Niederschlag an den in Laufrichtung der Bedruckstoffbahn 1 sich erstreckenden Wänden des Gehäuseoberteils 9 kann einfach an der jeweiligen Dichtleiste vorbei nach unten durchlaufen und so über den jeweiligen Flüssigkeitsausgang 27 abgeführt werden, da das Gehäuse breiter als die Bedruckstoffbahn 1 ist. Der Niederschlag auf den quer zur Laufrichtung der Bedruckstoffbahn 1 verlaufenden Wänden des Gehäuseoberteils 9 wird an der jeweils unteren Wandkante aufgefangen, um ein Abtropfen auf die Bedruckstoffbahn 1 und damit deren Verschmutzung und gegebenenfalls Aufweichung zu verhindern.The precipitation on the in the running direction of the substrate 1 itself extending walls of the upper housing part 9 can simply on the Pass the respective sealing strip downwards and so over the respective liquid outlet 27 are discharged because the housing is wider than the printing material web 1. The precipitation on the across Running direction of the printing material web 1 extending walls of the Upper housing part 9 is caught on the lower wall edge in order dripping onto the printing material web 1 and thus its contamination and prevent softening if necessary.

Hierzu sind an den unteren Enden der quer zur Laufrichtung der Bedruckstoffbahn 1 verlaufenden Wände des Gehäuseoberteils 9, also hier an der Trennwand 22 zwischen Sprühkammer 23 und Kondensationskammer 24 und der hierzu parallelen vorderen bzw. hinteren Frontwand 29, 30 von Sprühkammer 23 bzw. Kondensationskammer 24, Tropfenfänger 31 angeordnet, welche die an der jeweils zugehörigen Wand herablaufenden Tropfen aufnehmen und abführen. Die Tropfenfänger 31 können als die untere Kante der jeweils zugeordneten Wand unterfassende Rinnen ausgebildet sein. Im dargestellten Beispiel sind die Tropfenfänger 31 rohrförmig ausgebildet und so an die jeweils zugeordnete Wand angesetzt, daß sich eine kleine Rinne zwischen Wand und Rohrumfang ergibt.For this purpose, at the lower ends of the cross to the direction of the Printing material web 1 running walls of the upper housing part 9, so here on the partition 22 between the spray chamber 23 and Condensation chamber 24 and the parallel front and rear Front wall 29, 30 of spray chamber 23 or condensation chamber 24, Drip catcher 31 arranged on the respective associated wall Pick up and drain off the falling drops. The drip catchers 31 can be seen as the lower edge of the assigned wall Gutters. In the example shown, the drip catchers 31 tubular and attached to the assigned wall, that there is a small groove between the wall and the pipe circumference.

Die Tropfenfänger 31 bestehen im dargestellten Beispiel, wie am besten aus Figur 4 erkennbar ist, aus einem inneren Rohr 32, auf das ein Strumpf 33 aus textilem Material aufgezogen ist. Das Rohr 32 ist mit einer oder mehreren Lochreihen 34 versehen, die so angeordnet sind, daß das Rohr 32 nach unten geschlossen ist. Im dargestellten Beispiel ist eine obere Lochreihe 34 vorgesehen. Der Strumpf 33 besteht zweckmäßig aus einem engmaschigen Textilmaterial, wie Samt. Hierdurch ist eine gute Saugfähigkeit gewährleistet. Aufgrund dieser Saugfähigkeit wird die am Umfang der so ausgebildeten Tropfenfänger 31 aufgesammelte Flüssigkeit den Löchern der Lochreihe 34 zugeführt, über die die Flüssigkeit in das Rohr 32 gelangt und von diesem abgeführt werden kann.In the example shown, the drip catchers 31 consist of how best FIG. 4 can be seen from an inner tube 32 on which a stocking 33 is made of textile material. The tube 32 is with one or provided several rows of holes 34 which are arranged so that the tube 32nd is closed down. In the example shown there is an upper row of holes 34 provided. The stocking 33 suitably consists of a close-knit Textile material, such as velvet. This is good absorbency guaranteed. Because of this absorbency, the extent of the so trained drip 31 collected liquid the holes of the Row of holes 34 fed through which the liquid enters the tube 32 and can be dissipated from this.

Um diesen Vorgang zu unterstützen können die Rohre der Tropfenfänger 31 mit Saugzug beaufschlagt sein, wie in Figur 4 durch einen Pfeil 35 angedeutet ist. Hierzu sind die Rohre 32 an einem Ende geschlossen und am anderen Ende mit dem Saugstutzen einer Pumpe verbunden. Im Bereich vor oder nach der Pumpe kann ein Flüssigkeitsabscheider vorgesehen sein, dessen Ausgang in die Ablaufleitung 28 münden kann, sodaß auch die über die Tropfenfänger 31 aufgefangene Flüssigkeit zur Versorgungsstation 35 zurückgeführt wird.In order to support this process, the tubes of the drip catcher 31 be subjected to suction, as in FIG. 4 by an arrow 35 is indicated. For this purpose, the tubes 32 are closed at one end and connected at the other end to the suction port of a pump. In the area A liquid separator can be provided before or after the pump, whose output can open into the drain line 28, so that the over the drip 31 collected liquid to the supply station 35 is returned.

Claims (10)

  1. Device for re-moistening a freshly-printed and dried stock web (1) with a housing, provided with an inlet aperture (11) and an outlet aperture (12), through which the stock web (1) passes, this housing being located in a zone lying downstream of the drier (2), preferably in the zone between the drier (2) and the cooling unit (3) and being provided with spray nozzles (7) which can be supplied with moistening agent, mounted above and below the plane of movement of the stock web (1), characterized in that drip-catchers (31) are arranged on the lower edges of the walls (22,29,30) of the upper housing section which cross the plane of movement of the stock web (1), that liquid accumulating in the drip-catchers (31) and in the lower housing section can be carried away, and that air-knife devices (20) which can be supplied with compressed air are provided opposite one another relative to the plane of movement of the stock web (1), at least in the area of the outlet aperture (12).
  2. Device according to claim 1, characterized in that each of the drip-catchers (31) is made of a tube (32) sealed at the bottom and covered with a stocking (33) of textile material, preferably close-meshed textile material, preferably velvet.
  3. Device according to claim 2, characterized in that the tube (32) is provided with at least an upper series of holes (34) and can preferably be subjected to a suction draught.
  4. Device according to any of the preceding claims, characterized in that the housing (2) has separable housing sections in the form of a bottom section (8) and a top section (9) which, when placed together, can be sealed relative to one another in the area of the housing end faces which are parallel to the direction of movement of the stock web (1), wherein preferably the housing bottom section (8) is fixed and the housing upper section can be raised by means of a lifting device (10).
  5. Device according to any of the preceding claims, characterized in that the housing has at top and bottom a spray chamber (23) containing the spray nozzles (7), and a condensing chamber (24) without nozzles, downstream of the former in the direction of movement of the stock web (1), each preferably having an exhaust flue (25), while the lower spray chamber (23) and the exhaust flue (25) of the lower condensing chamber (24) each has a fluid outlet (27) connected to an outlet line (28).
  6. Device according to any of the preceding claims, characterized in that the upper-side wall areas of the housing top section (9) and the lower-side wall areas of the housing bottom section (8) are inclined relative to the plane of movement of the stock web (1).
  7. Device according to any of the preceding claims, characterized in that the housing may be located by means of a retaining device (14) on the column (4) of the cooling unit (3), wherein the retaining device (14) preferably has a bracket connected to the housing bottom section (8), on which is mounted the lifting device (10) in contact with the housing top section.
  8. Device according to any of the preceding claims, characterized in that the spray nozzles (7) can be supplied with fluid, preferably water, and with air.
  9. Device according to any of the preceding claims, characterized in that the mixing ratio of the media supplied to the spray nozzles (7) is adjustable.
  10. Device according to any of the preceding claims, characterized in that each of the air-knife devices (20) has a pipe to which compressed-air can be admitted, and which is provided with air nozzles with an air direction component directed against the direction of movement of the stock web (1).
EP97104467A 1996-04-17 1997-03-15 Device for remoistening a printed web Expired - Lifetime EP0802052B1 (en)

Applications Claiming Priority (2)

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DE19615198A DE19615198C1 (en) 1996-04-17 1996-04-17 Rewetting freshly printed dried printed matter
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ES2135275T3 (en) 1999-10-16
DE19615198C1 (en) 1997-07-24
US5813332A (en) 1998-09-29
DE59700209D1 (en) 1999-07-22
EP0802052A1 (en) 1997-10-22

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