EP1022136B1 - Device for conditioning a paper web - Google Patents

Device for conditioning a paper web Download PDF

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Publication number
EP1022136B1
EP1022136B1 EP00100099A EP00100099A EP1022136B1 EP 1022136 B1 EP1022136 B1 EP 1022136B1 EP 00100099 A EP00100099 A EP 00100099A EP 00100099 A EP00100099 A EP 00100099A EP 1022136 B1 EP1022136 B1 EP 1022136B1
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EP
European Patent Office
Prior art keywords
dryer
paper web
moisturising
spray
temperature
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EP00100099A
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German (de)
French (fr)
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EP1022136A3 (en
EP1022136A2 (en
Inventor
Michael Motzke
Bruno Brischler
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Baldwin Germany GmbH
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Baldwin Germany 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
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0483—Drying combined with cooling
    • 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 conditioning a preferably freshly printed paper web with a dryer and a rewet, wherein the dryer a Heating zone, temperature maintenance zone and cooling zone and the Remoistening device above and below the Transport level of the paper web arranged, with Humidifier acted upon spray nozzles and these have receiving spray chambers.
  • a device of this type is known from DE 44 05 332 A1.
  • a tunnel housing passed through by the paper web, which has two successive departments of, from the dryer-free department as a remoistening device with above and below the Transport level of the paper web arranged, with Humidifying agent containing spray nozzles containing Chambers is formed and the department close to and arranged below the transport plane of the paper web, Air knives to be doctored with compressed air for doctoring off the Paper web entrained solvents is provided. That to the Dryer attached tunnel housing requires comparatively much Space between dryer and chill roll stand.
  • the cooling zone The known dryer usually contains cooling air act on blowing nozzles. Because the heat capacity of the air comparatively is low, this is a comparatively large Space required, apart from the construction effort.
  • This object is achieved in that the immediately adjacent to the temperature holding zone, in the Dryer integrated cooling zone of the dryer one for rewetting and cooling the paper web (2) serving humidifier (8), the spray nozzles (10) one for the rewetting required amount of liquid exceeding amount of liquid can be fed.
  • the amount of fountain solution supplied to the spray nozzles is greater than the rewet amount is ensured that in addition to the Remoistening also a reliable cooling of the paper web he follows. Because the rewet device integrates with the dryer is, the distance between the dryer and a this downstream chill roll stand comparatively small be, resulting in a relatively short overall arrangement results. Even the dryer itself can be used as a result of coming liquid cooling of the paper web comparatively be compact.
  • the moistening of the paper web use namely, has a liquid compared to the heat capacity of air comparatively high heat capacity, so that already a comparatively small amount of dampening solution to accomplish sufficient reliable cooling of the web.
  • An advantageous measure may be that the spray nozzles with dampening solution and compressed air for blowing can be acted upon are. As a result, advantageously a good distribution the dampening solution and in particular a high penetration of dampening solution achieved.
  • Another, particularly preferable, measure may be that the spray chambers in a respective associated suction are arranged, which by means of at least one associated, Extractable in the dryer exhaust blower are. This results in the spray chambers flanking, one and exit-side ducts, which provide a reliable discharge ensure an expected, large volume of air. There The exhaust ducts are sucked, it is ensured that no Air can escape to the outside. Air squeegee can therefore either completely omitted or dimensioned comparatively weak, which is beneficial to avoiding effort and avoidance a railway disturbance. At the same time this is thereby Ensure that no moisture escapes to the outside. A condensation outside the humidifier is therefore not to be feared. Because the blower (s) in the dryer blow out, also results in a comparatively simple construction. In addition, this measure also proves to be energetically favorable, since the blown air already tempered is.
  • each suction fan at least one cooler be upstream. This will achieve that from the air entrained oil and water are excreted, causing the Eradication eased.
  • the drawing described below shows a schematic longitudinal section through one with a Humidifier provided dryer.
  • the dryer 1 shown in the drawing between the last printing unit of a non-illustrated Web-fed rotary printing press and also not closer shown cooling roller stand is arranged, has three in Running direction of the paper web 2 zones arranged one behind the other, namely, a heating zone 3, a temperature holding zone 4 and a Cooling zone 5. Each zone is a compartment inside the housing of the Drier 1 assigned. Between successive Compartments are partitions 6 are provided.
  • the cooling zone 5 associated compartment contains a as a whole with 8 designated moistening, the Cooling and remoistening of the paper web 2 is used in the upstream zones due to the local there Heat exposure Moisture loses.
  • the paper web is the second with a dampening solution, preferably in the form of water, applied.
  • the paper web 2 supplied dampening solution is so large that the paper web 2 to the desired Temperature is cooled and the moisture content of the Paper web 3 is simultaneously raised to the desired level becomes.
  • the cooling takes place by evaporation of liquid, wherein the heat of vaporization of the paper web 2 is withdrawn.
  • the vaporizing liquid gives but no rewetting.
  • the total amount of the paper web 2 supplied liquid consists therefore of a remindbefeuchtungsanteil and a Supplement for the cooling.
  • the setting of the total liquid quantity takes place Accordingly, depending on the moisture requirement of Paper web 2 and the desired cooling temperature difference.
  • Simple cases can be a function of the temperature the paper web 2 in front of the moistening device 8, i. expedient when leaving the temperature maintenance zone 4, and the Web speed and paper type control be provided. But it would also be possible to have a regulation the additionally or alternatively still the humidity and / or Temperature of the paper web 2 after the moistening device 8 and / or the temperature in the cooling zone 5 as actual values received.
  • the moistening device 8 contains above and below the transport plane of the paper web 2 provided, here roof or V-shaped spray chambers 9, each one about the whole width of the paper web 2 continuous row of Spray nozzles 10 included.
  • roof or V-shaped spray chambers 9 each one about the whole width of the paper web 2 continuous row of Spray nozzles 10 included.
  • the spray nozzle row extends appropriate over the entire width of the dryer and is through Shutdown of external nozzles to the paper web width customizable.
  • the spray nozzles 10 are in the example shown with Dampening solution, preferably in the form of water, and compressed air subjected to the blowing out and atomizing of the dampening solution, as indicated by the supply lines 11, 12. These are provided with switching elements 13, 14 in the form of valves, etc., which are controllable here by means of a control device 15, the actual value inputs for the temperature of the paper web 2 before Humidification, the temperature of the cooling zone 5 and the humidity and temperature of the paper web 2 after moistening. These actual value inputs are via signal lines with associated sensors, here the temperature sensors 16, 17 and a combined temperature and humidity sensor 30 connected.
  • Temperature sensor 16 is in the output range of Temperature holding zone 4 is arranged near the paper web 2.
  • associated temperature sensor 17 is in the cooling zone 5 outside the humidifier 8 i arranged.
  • the combined temperature and Humidity sensor 30 is in the area of the outlet of the dryer 1 arranged.
  • the controller 15 is still with another, beneficial with the printing press coupled input 31 for the web speed and with an input option 32 for the input of fixed parameters, like the paper type.
  • the spray chambers 9 are so from a respectively assigned, Roof or V-shaped suction chamber 18 overlapped or understood that the inlet and outlet side ducts 19 result. These are extracted individually or together. in the example shown here is one in the field of remote Corner of each suction chamber 18 arranged exhaust fan 20th provided that the respectively associated suction chamber 18th sucks and in the cooling zone 5 associated compartment of the Drier 1 blows out. As a result, the dryer 1 tempered Supplied with air, so that sucked from the outside, by arrows 21 indicated fresh air can be reduced accordingly, which has a favorable effect on the energy requirement.
  • Each exhaust fan 20 is preceded by a radiator 22.
  • the dryer 1 is therefore by the blower 20 supplied comparatively unloaded air.
  • the means of the radiator 22 condensate is discharged via a condensate drain line 23 dissipated.
  • the secluded Water can to avoid disposal of the nozzles 10th be fed again.
  • the water outlet 33 of the Wasserabscheiders 24 returned to the supply line 11 be.
  • the confluence is conveniently upstream from the switching element 13.
  • To one Dripping from the lower ends of the walls of the upper Preventing chambers are at the lower ends of the walls the upper spray chamber 9 and suction 18 drip 27 attached, which expediently in not shown here Way be connected to the condensate drain line 23 can.

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

Description

Die Erfindung betrifft eine Vorrichtung zum Konditionieren einer vorzugsweise frisch bedruckten Papierbahn mit einem Trockner und einer Rückbefeuchtungseinrichtung, wobei der Trockner eine Aufheizzone, Temperaturhaltezone und Abkühlzone und die Rückbefeuchtungseinrichtung oberhalb und unterhalb der Transportebene der Papierbahn angeordnete, mit Befeuchtungsmittel beaufschlagbare Sprühdüsen und diese aufnehmende Sprühkammern aufweisen.The invention relates to a device for conditioning a preferably freshly printed paper web with a dryer and a rewet, wherein the dryer a Heating zone, temperature maintenance zone and cooling zone and the Remoistening device above and below the Transport level of the paper web arranged, with Humidifier acted upon spray nozzles and these have receiving spray chambers.

Eine Vorrichtung dieser Art ist aus der DE 44 05 332 A1 bekannt. Bei dieser bekannten Anordnung ist zwischen dem Ausgang des Trockners und einem diesem nachgeordneten Kühlwalzenständer ein von der Papierbahn durchlaufenes Tunnelgehäuse vorgesehen, das zwei hintereinander angeordnete Abteilungen aufweist, von denen die trocknerferne Abteilung als Rückbefeuchtungseinrichtung mit ober- und unterhalb der Transportebene der Papierbahn angeordnete, mit Befeuchtungsmittel beaufschlagbare Sprühdüsen enthaltenden Kammern ausgebildet ist und die trocknernahe Abteilung mit ober- und unterhalb der Transportebene der Papierbahn angeordneten, mit Pressluft beaufschlagbaren Luftrakeln zum Abrakeln der von der Papierbahn mitgeführten Lösungsmitteln versehen ist. Das an den Trockner angebaute Tunnelgehäuse erfordert vergleichsweise viel Bauraum zwischen Trockner und Kühlwalzenständer. Die Abkühlzone der bekannten Trockner enthält in der Regel mit Kühlluft beaufschlagbare Blasdüsen. Da die Wärmekapazität der Luft vergleichsweise gering ist, wird auch hierbei ein vergleichsweise großer Bauraum benötigt, vom baulichen Aufwand ganz abgesehen.A device of this type is known from DE 44 05 332 A1. In this known arrangement is between the output of Trockners and this downstream chill roll stand a tunnel housing passed through by the paper web, which has two successive departments of, from the dryer-free department as a remoistening device with above and below the Transport level of the paper web arranged, with Humidifying agent containing spray nozzles containing Chambers is formed and the department close to and arranged below the transport plane of the paper web, Air knives to be doctored with compressed air for doctoring off the Paper web entrained solvents is provided. That to the Dryer attached tunnel housing requires comparatively much Space between dryer and chill roll stand. The cooling zone The known dryer usually contains cooling air act on blowing nozzles. Because the heat capacity of the air comparatively is low, this is a comparatively large Space required, apart from the construction effort.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Vorrichtung eingangs erwähnter Art mit einfachen und kostengünstigen Mitteln so zu verbessern, dass eine kompakte Gesamtbauweise erreichbar ist.On this basis, it is the object of the present invention, a device of the type mentioned with simple and cost-effective means to improve so that a compact overall design is reachable.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die sich an die Temperaturhaltezone unmittelbar anschließende, in den Trockner integrierte Abkühlzone des Trockners eine zur Rückbefeuchtung und Kühlung der Papierbahn (2) dienende Befeuchtungseinrichtung (8) enthält, deren Sprühdüsen (10) eine die zur Rückbefeuchtung benötigte Flüssigkeitsmenge übersteigende Flüssigkeitsmenge zuführbar ist.This object is achieved in that the immediately adjacent to the temperature holding zone, in the Dryer integrated cooling zone of the dryer one for rewetting and cooling the paper web (2) serving humidifier (8), the spray nozzles (10) one for the rewetting required amount of liquid exceeding amount of liquid can be fed.

Da die den Sprühdüsen zugeführte Feuchtmittelmenge größer als die Rückbefeuchtungsmenge ist, ist sichergestellt, dass neben der Rückbefeuchtung auch eine zuverlässige Kühlung der Papierbahn erfolgt. Da die Rückbefeuchtungseinrichtung in den Trockner integriert ist, kann der Abstand zwischen dem Trockner und einem diesem nachgeordneten Kühlwalzenständer vergleichsweise klein sein, wodurch sich eine vergleichsweise kurze Gesamtanordnung ergibt. Auch der Trockner selbst kann in Folge der zur Anwendung kommenden Flüssigkeitskühlung der Papierbahn vergleichsweise kompakt sein. Die zur Befeuchtung der Papierbahn Verwendung findende Flüssigkeit besitzt nämlich eine im Vergleich zur Wärmekapazität von Luft vergleichsweise hohe Wärmekapazität, so dass bereits eine vergleichsweise geringe Feuchtmittelmenge zur Bewerkstelligung einer zuverlässigen Kühlung der Bahn ausreicht. Man kommt daher mit vergleichsweise wenig Sprühdüsen aus, was Bauraum spart und sich vorteilhaft auf die Vermeidung einer Beunruhigung der laufenden Papierbahn auswirkt. Ein weiterer Vorteil der erfindungsgemäßen Maßnahmen ist darin zu sehen, dass die Feuchtmittelstrahlen in Folge ihrer hohen Durchschlagskraft sowie in Folge der bei der Verdampfung sich ergebenden Volumenvergrößerung die die Papierbahn flankierende, mit Lösungsmittel beladene, laminare Luftschicht zuverlässig aufreißen können. Hierdurch ist sichergestellt, dass diese mit Lösungsmittel beladene Luft schon im Trockner zur Ablösung von der Papierbahn gebracht wird, was die Entsorgung erleichtert, da der Trockner ohnehin mit geeigneten Einrichtungen versehen ist, und eine unerwünschte, äußere Ausbreitung von Lösungsmittel verhindert. Gleichzeitig ist hierdurch sichergestellt, dass zusätzliche Mittel zum Aufreißen der laminiaren Luftschicht, wie beim Stand der Technik vorhandene Tunnel mit und ohne Blasdüsen, nicht benötigt werden, was ebenfalls Bauraum und baulichen Aufwand spart. Since the amount of fountain solution supplied to the spray nozzles is greater than the rewet amount is ensured that in addition to the Remoistening also a reliable cooling of the paper web he follows. Because the rewet device integrates with the dryer is, the distance between the dryer and a this downstream chill roll stand comparatively small be, resulting in a relatively short overall arrangement results. Even the dryer itself can be used as a result of coming liquid cooling of the paper web comparatively be compact. The moistening of the paper web use namely, has a liquid compared to the heat capacity of air comparatively high heat capacity, so that already a comparatively small amount of dampening solution to accomplish sufficient reliable cooling of the web. you Therefore, it comes with comparatively little spray nozzles, which means space saves and is beneficial to avoiding worry the running paper web. Another advantage of inventive measures can be seen in that the Dampening solution blasting as a result of their high penetration power as well as a result of the resulting increase in volume during evaporation the paper web flanking, solvent laden, Laminar air layer can tear reliably. This is ensures that these air laden with solvent already in Dryer for detachment from the paper web is brought what the Disposal easier, since the dryer anyway with suitable facilities is provided, and an undesirable, external spread prevented by solvent. At the same time this ensures additional means for tearing the laminar air layer, as in the prior art existing tunnel with and without tuyeres, not needed, what also space and Structural effort saves.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben.Advantageous embodiments and expedient further developments of Parent measures are specified in the subclaims.

Eine vorteilhafte Maßnahme kann darin bestehen, dass die Sprühdüsen mit Feuchtmittel und Druckluft zum Ausblasen beaufschlagbar sind. Hierdurch werden in vorteilhafter Weise eine gute Verteilung des Feuchtmittels und insbesondere auch eine hohe Durchschlagskraft des Feuchtmittels erreicht.An advantageous measure may be that the spray nozzles with dampening solution and compressed air for blowing can be acted upon are. As a result, advantageously a good distribution the dampening solution and in particular a high penetration of dampening solution achieved.

Eine weitere, besonders zu bevorzugende Maßnahme kann darin bestehen, dass die Sprühkammern in einer jeweils zugeordneten Absaugkammer angeordnet sind, die mittels wenigstens eines zugeordneten, in den Trockner ausblasenden Absauggebläses absaugbar sind. Hierdurch ergeben sich die Sprühkammern flankierende, ein- und ausgangsseitige Abzugschächte, die eine zuverlässige Abführung eines zu erwartenden, großen Luftvolumens gewährleisten. Da die Abzugschächte abgesaugt werden, ist sichergestellt, dass keine Luft nach außen austreten kann. Luftrakel können daher entweder ganz entfallen oder vergleichsweise schwach dimensioniert werden, was sich vorteilhaft auf die Vermeidung von Aufwand und die Vermeidung einer Bahnbeunruhigung auswirkt. Gleichzeitig wird hierdurch sichergestellt, dass keine Feuchtigkeit nach außen austritt. Eine Kondensatbildung außerhalb der Befeuchtungseinrichtung ist daher nicht zu befürchten. Da das bzw. die Gebläse in den Trockner ausblasen, ergibt sich auch eine vergleichsweise einfache Bauweise. Zudem erweist sich diese Maßnahme auch als energetisch günstig, da die ausgeblasene Luft bereits temperiert ist.Another, particularly preferable, measure may be that the spray chambers in a respective associated suction are arranged, which by means of at least one associated, Extractable in the dryer exhaust blower are. This results in the spray chambers flanking, one and exit-side ducts, which provide a reliable discharge ensure an expected, large volume of air. There The exhaust ducts are sucked, it is ensured that no Air can escape to the outside. Air squeegee can therefore either completely omitted or dimensioned comparatively weak, which is beneficial to avoiding effort and avoidance a railway disturbance. At the same time this is thereby Ensure that no moisture escapes to the outside. A condensation outside the humidifier is therefore not to be feared. Because the blower (s) in the dryer blow out, also results in a comparatively simple construction. In addition, this measure also proves to be energetically favorable, since the blown air already tempered is.

Zweckmäßig kann jedem Absauggebläse wenigstens ein Kühler vorgeordnet sein. Hierdurch wird erreicht, dass von der Luft mitgeführtes Öl und Wasser ausgeschieden werden, was die Beseitigung erleichtert.Suitably, each suction fan at least one cooler be upstream. This will achieve that from the air entrained oil and water are excreted, causing the Eradication eased.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den restlichen Unteransprüchen angegeben und aus der nachstehenden Beispielsbeschreibung anhand der Zeichnung näher entnehmbar.Further advantageous embodiments and expedient Trainings of the superordinate measures are in the rest of subclaims and from the following example description with reference to the drawing closer removable.

Die nachstehend beschriebene Zeichnung zeigt einen schematischen Längsschnitt durch einen mit einer Befeuchtungseinrichtung versehenen Trockner.The drawing described below shows a schematic longitudinal section through one with a Humidifier provided dryer.

Anwendungsgebiet der Erfindung sind in der Regel Rollenrotationsdruckmaschinen, denen ein Trockner nachgeordnet ist. Der grundsätzliche Aufbau und die Wirkungsweise derartiger Anordnungen sind an sich bekannt. Die nachfolgende Beschreibung erstreckt sich daher im Wesentlichen auf den erfindungsgemäßen Bereich des Trockners.Field of application of the invention are in the rule Web-fed rotary printing machines, which have a dryer is subordinate. The basic structure and the Mode of action of such arrangements are known per se. The The following description therefore essentially extends on the inventive area of the dryer.

Der in der Zeichnung gezeigte Trockner 1, der zwischen dem letzten Druckwerk einer nicht näher dargestellten Rollenrotationsdruckmaschine und einem ebenfalls nicht näher dargestellten Kühlwalzenständer angeordnet ist, besitzt drei in Laufrichtung der Papierbahn 2 hintereinander angeordnete Zonen, nämlich eine Aufheizzone 3, eine Temperaturhaltezone 4 und eine Kühlzone 5. Jeder Zone ist ein Abteil innerhalb des Gehäuses des Trockners 1 zugeordnet. Zwischen den aufeinanderfolgenden Abteilen sind Trennwände 6 vorgesehen.The dryer 1 shown in the drawing, between the last printing unit of a non-illustrated Web-fed rotary printing press and also not closer shown cooling roller stand is arranged, has three in Running direction of the paper web 2 zones arranged one behind the other, namely, a heating zone 3, a temperature holding zone 4 and a Cooling zone 5. Each zone is a compartment inside the housing of the Drier 1 assigned. Between successive Compartments are partitions 6 are provided.

In der Aufheizzone 3 und der Temperaturhaltezone 4 wird die Papierbahn 2 mit Heißluft etc. beaufschlagt, wie durch Düsen 7 angedeutet ist. Das der Kühlzone 5 zugeordnete Abteil enthält eine als Ganzes mit 8 bezeichnete Befeuchtungseinrichtung, die zur Kühlung und Rückbefeuchtung der Papierbahn 2 dient, die in den vorgeordneten Zonen auf Grund der dortigen Wärmebeaufschlagung Feuchtigkeit verliert.In the heating zone 3 and the temperature holding zone 4 is the Paper web 2 with hot air, etc. acted upon, as by nozzles. 7 is indicated. The cooling zone 5 associated compartment contains a as a whole with 8 designated moistening, the Cooling and remoistening of the paper web 2 is used in the upstream zones due to the local there Heat exposure Moisture loses.

Mit Hilfe der Befeuchtungseinrichtung 8 wird die Papierbahn 2 mit einem Feuchtmittel, vorzugsweise in Form von Wasser, beaufschlagt. Die der Papierbahn 2 zugeführte Feuchtmittelmenge ist dabei so groß, dass die Papierbahn 2 auf die gewünschte Temperatur abgekühlt wird und der Feuchtigkeitsgehalt der Papierbahn 3 gleichzeitig auf das gewünschte Niveau angehoben wird. Die Kühlung erfolgt durch Verdampfung von Flüssigkeit, wobei die Verdampfungswärme der Papierbahn 2 entzogen wird. Die verdampfende Flüssigkeit ergibt aber keine Rückbefeuchtung. Die Gesamtmenge der der Papierbahn 2 zugeführten Flüssigkeit besteht daher aus einem Rückbefeuchtungsanteil und einem Zuschlag für die Kühlung. With the help of the moistening 8, the paper web is the second with a dampening solution, preferably in the form of water, applied. The paper web 2 supplied dampening solution is so large that the paper web 2 to the desired Temperature is cooled and the moisture content of the Paper web 3 is simultaneously raised to the desired level becomes. The cooling takes place by evaporation of liquid, wherein the heat of vaporization of the paper web 2 is withdrawn. The vaporizing liquid gives but no rewetting. The total amount of the paper web 2 supplied liquid consists therefore of a Rückbefeuchtungsanteil and a Supplement for the cooling.

Die Einstellung der Gesamtflüssigkeitsmenge erfolgt dementsprechend in Abhängigkeit vom Feuchtigkeitsbedarf der Papierbahn 2 und der gewünschten Abkühltemperaturdifferenz. In einfachen Fällen kann eine in Abhängigkeit von der Temperatur der Papierbahn 2 vor der Befeuchtungseinrichtung 8, d.h. zweckmäßig beim Verlassen der Temperaturhaltezone 4, sowie der Bahngeschwindigkeit und Papierart erfolgende Steuerung vorgesehen sein. Es wäre aber auch eine Regelung denkbar, bei der zusätzlich oder alternativ noch die Feuchtigkeit und/oder Temperatur der Papierbahn 2 nach der Befeuchtungseinrichtung 8 und/oder die Temperatur in der Kühlzone 5 als Ist-Werte eingehen.The setting of the total liquid quantity takes place Accordingly, depending on the moisture requirement of Paper web 2 and the desired cooling temperature difference. In Simple cases can be a function of the temperature the paper web 2 in front of the moistening device 8, i. expedient when leaving the temperature maintenance zone 4, and the Web speed and paper type control be provided. But it would also be possible to have a regulation the additionally or alternatively still the humidity and / or Temperature of the paper web 2 after the moistening device 8 and / or the temperature in the cooling zone 5 as actual values received.

Die Befeuchtungseinrichtung 8 enthält oberhalb und unterhalb der Transportebene der Papierbahn 2 vorgesehene, hier dach- bzw. v-förmig ausgebildete Sprühkammern 9, die jeweils eine über die ganze Breite der Papierbahn 2 durchgehende Reihe von Sprühdüsen 10 enthalten. Es könnten natürlich auch mehrere Düsenreihen vorgesehen sein. Die Sprühdüsenreihe erstreckt sich zweckmäßig über die ganze Trocknerbreite und ist durch Abschaltung äußerer Düsen an die Papierbahnbreite anpassbar.The moistening device 8 contains above and below the transport plane of the paper web 2 provided, here roof or V-shaped spray chambers 9, each one about the whole width of the paper web 2 continuous row of Spray nozzles 10 included. Of course, there could be several Be provided nozzle rows. The spray nozzle row extends appropriate over the entire width of the dryer and is through Shutdown of external nozzles to the paper web width customizable.

Die Sprühdüsen 10 werden im dargestellten Beispiel mit Feuchtmittel, vorzugsweise in Form von Wasser, und Druckluft zum Ausblasen und Zerstäuben des Feuchtmittels beaufschlagt, wie durch die Versorgungsleitungen 11, 12 angedeutet ist. Diese sind mit Schaltorganen 13, 14 in Form von Ventilen etc. versehen, die hier mittels einer Regelungseinrichtung 15 ansteuerbar sind, die Ist-Wert-Eingänge für die Temperatur der Papierbahn 2 vor der Befeuchtung, die Temperatur der Kühlzone 5 und die Feuchtigkeit und Temperatur der Papierbahn 2 nach der Befeuchtung aufweist. Diese Ist-Wert-Eingänge sind über Signalleitungen mit zugeordneten Sensoren, hier den Temperaturfühlern 16, 17 und einem kombinierten Temperatur- und Feuchtigkeitsfühler 30 verbunden.The spray nozzles 10 are in the example shown with Dampening solution, preferably in the form of water, and compressed air subjected to the blowing out and atomizing of the dampening solution, as indicated by the supply lines 11, 12. These are provided with switching elements 13, 14 in the form of valves, etc., which are controllable here by means of a control device 15, the actual value inputs for the temperature of the paper web 2 before Humidification, the temperature of the cooling zone 5 and the humidity and temperature of the paper web 2 after moistening. These actual value inputs are via signal lines with associated sensors, here the temperature sensors 16, 17 and a combined temperature and humidity sensor 30 connected.

Der der Bahntemperatur vor der Befeuchtung zugeordnete Temperaturfühler 16 ist im Ausgangsbereich der Temperaturhaltezone 4 nahe der Papierbahn 2 angeordnet. Der der Temperatur in der Kühlzone 5 zugeordnete Temperaturfühler 17 ist in der Kühlzone 5 außerhalb der Befeuchtungseinrichtung 8 i angeordnet. Der kombinierte Temperatur- und Feuchtigkeitsfühler 30 ist im Bereich des Ausgangs des Trockners 1 angeordnet. Zusätzlich ist die Steuerungseinrichtung 15 noch mit einem weiteren, vorteilhaft mit der Druckmaschine gekoppelten Eingang 31 für die Bahngeschwindigkeit und mit einer Eingabemöglichkeit 32 zur Eingabe von festen Parametern, wie der Papierart, versehen.The associated with the web temperature before moistening Temperature sensor 16 is in the output range of Temperature holding zone 4 is arranged near the paper web 2. Of the the temperature in the cooling zone 5 associated temperature sensor 17 is in the cooling zone 5 outside the humidifier 8 i arranged. The combined temperature and Humidity sensor 30 is in the area of the outlet of the dryer 1 arranged. In addition, the controller 15 is still with another, beneficial with the printing press coupled input 31 for the web speed and with an input option 32 for the input of fixed parameters, like the paper type.

Die Sprühkammern 9 sind so von einer jeweils zugeordneten, dach- bzw. v-förmigen Absaugkammer 18 übergriffen bzw. unterfaßt, dass sich ein- und ausgangsseitige Abzugschächte 19 ergeben. Diese werden einzeln oder gemeinsam abgesaugt. Im dargestellten Beispiel ist hierzu ein im Bereich der bahnfernen Ecke jeder Absaugkammer 18 angeordnetes Absauggebläse 20 vorgesehen, das die jeweils zugeordnete Absaugkammer 18 absaugt und in das der Kühlzone 5 zugeordnete Abteil des Trockners 1 ausbläst. Dadurch wird dem Trockner 1 temperierte Luft zugeführt, so dass die von außen angesaugte, durch Pfeile 21 angedeutete Frischluft entsprechend reduziert werden kann, was sich günstig auf den Energiebedarf auswirkt.The spray chambers 9 are so from a respectively assigned, Roof or V-shaped suction chamber 18 overlapped or understood that the inlet and outlet side ducts 19 result. These are extracted individually or together. in the example shown here is one in the field of remote Corner of each suction chamber 18 arranged exhaust fan 20th provided that the respectively associated suction chamber 18th sucks and in the cooling zone 5 associated compartment of the Drier 1 blows out. As a result, the dryer 1 tempered Supplied with air, so that sucked from the outside, by arrows 21 indicated fresh air can be reduced accordingly, which has a favorable effect on the energy requirement.

Jedem Absauggebläse 20 ist ein Kühler 22 vorgeordnet. Dieser fungiert praktisch als Kondensator zum Ausscheiden von Flüssigkeit in Form von Feuchtmittel und Öl aus der abgesaugten Luft. Dem Trockner 1 wird daher durch die Gebläse 20 vergleichsweise unbelastete Luft zugeführt. Das mittels der Kühler 22 ausgeschiedene Kondensat wird über eine KondensatAblaufleitung 23 abgeführt. Diese führt über einen Wasserabscheider 24, wo Wasser abgeschieden wird, zu einem vorzugsweise im Trockner 1, hier in der Temperaturhaltezone 4, angeordneten Ölverdampfer 25, wo Öl verdampft wird, so dass eine Entsorgung über die trocknereigenen Nachverbrennungseinrichtungen etc. erfolgen kann. Das abgeschiedene Wasser kann zur Vermeidung einer Entsorgung den Düsen 10 wieder zugeführt werden. Hierzu kann der Wasserausgang 33 des Wasserabscheiders 24 in die Versorgungsleitung 11 zurückgeführt sein. Die Einmündung befindet sich zweckmäßig stromaufwärts vom Schaltorgan 13.Each exhaust fan 20 is preceded by a radiator 22. This practically acts as a capacitor for leaving Liquid in the form of dampening solution and oil from the extracted Air. The dryer 1 is therefore by the blower 20 supplied comparatively unloaded air. The means of the radiator 22 condensate is discharged via a condensate drain line 23 dissipated. This leads over one Water separator 24, where water is separated, to a preferably in the dryer 1, here in the temperature-holding zone 4, arranged oil evaporator 25, where oil is evaporated, so that disposal via the drier's own afterburners etc. can take place. The secluded Water can to avoid disposal of the nozzles 10th be fed again. For this purpose, the water outlet 33 of the Wasserabscheiders 24 returned to the supply line 11 be. The confluence is conveniently upstream from the switching element 13.

Am Ein- und Ausgang der Absaugkammern 18 können mit Druckluft beaufschlagbare Luftrakel 26 vorgesehen sein, die einen Austritt von mit Feuchtigkeit beladener Luft aus den Absaugkammern 18 verhindern. Hierdurch ist sichergestellt, dass sich außerhalb der Befeuchtungseinrichtung 8 innerhalb und außerhalb des Trockners 1 kein Kondensat bilden kann, das auf die Papierbahn 2 abtropfen und diese verunreinigen könnte. An den Innenseiten der Sprühkammern 9 bzw. Absaugkammern 18 bildet sich Kondensat, das nach unten abläuft. In den unteren Kammern gelangt dieses in den Kühler 22 und wird über die dort ohnehin vorgesehenen Ablaufeinrichtungen abgeführt. Um ein Abtropfen von den unteren Enden der Wände der oberen Kammern zu verhindern, sind an den unteren Enden der Wände der oberen Sprühkammer 9 und Absaugkammer 18 Tropfenfänger 27 angebracht, die zweckmäßig in hier nicht näher dargestellter Weise an die Kondensatablaufleitung 23 angeschlossen sein können.At the inlet and outlet of the suction chambers 18 can with Compressed air acting air knife 26 may be provided, the one Outlet of moisture laden air from the Prevent suction chambers 18. This ensures that outside of the humidifier 8 within and outside the dryer 1 can not form a condensate on drain the paper web 2 and could contaminate it. At the insides of the spray chambers 9 and suction chambers 18 condensate forms, which runs downwards. In the bottom Chambers enters this in the cooler 22 and is over there discharged drainage devices provided anyway. To one Dripping from the lower ends of the walls of the upper Preventing chambers are at the lower ends of the walls the upper spray chamber 9 and suction 18 drip 27 attached, which expediently in not shown here Way be connected to the condensate drain line 23 can.

Mittels der mit der in die Kühlzone 5 integrierten Befeuchtungseinrichtung 8 erzielbaren Flüssigkeitskühlung der Papierbahn 2 ergibt sich, wie die Zeichnung anschaulich erkennen lässt, eine im Vergleich zu den Zonen 3, 4 sehr kompakte Bauweise der Kühlzone 5. Die mittels der Sprühdüsen 10 erzeugbaren Flüssigkeitsstrahlen 28 besitzen eine hohe Durchschlagskraft, wodurch die die Papierbahn 2 flankierenden, laminaren Luftschichten, die mit Lösungsmittel beladen sind, zuverlässig aufgerissen werden. Dies wird durch die in Folge der Verdampfung erfolgende Volumenvergrößerung noch unterstützt. Das Lösungsmittel wird zusammen mit der Luft abgesaugt und damit zuverlässig entsorgt.By means of integrated with the in the cooling zone 5 Humidifying 8 achievable liquid cooling the Paper web 2 results, as the drawing clearly shows leaves, in comparison to the zones 3, 4 very compact Construction of the cooling zone 5. The means of the spray nozzles 10 can be generated liquid jets 28 have a high Penetrating force, whereby the paper web 2 flanking, laminar air layers loaded with solvent, be torn open reliably. This is done by in consequence of Evaporation volume increase still supported. The solvent is sucked off together with the air and so disposed of reliably.

Claims (10)

  1. A device for conditioning a preferably freshly printed paper web (2) with a dryer (1) and a remoistening device, wherein the dryer (1) exhibits a heating zone (3), a temperature maintenance zone (4) and a cooling zone (5) and the remoistening device exhibits spray jets (10) through which moisturising agents can be admitted, arrayed above and below the transport surface of the paper web (2), and spray chambers (9) containing the same, characterised in that the cooling zone (5) of the dryer (1) which is integrated in the dryer (1) and follows immediately to temperature maintenance zone (4) contains a moisturising device (8) for the purpose of remoistening and cooling the paper web (2), whereby the amount of moisturising agent channelled to the spray jets (10) of the moisturising device (8) is greater than the amount which is needed for remoistening purposes.
  2. A device according to claim 1, characterised in that the amount of moisturising agent channelled to the spray jets (10) can be adjusted, by means of an adjustment device (15), as a function of velocity of the paper web (2), of the type of paper, of the temperature of the paper web (2) when the web is leaving the temperature maintenance zone (4).
  3. A device according claim 2, characterised in that the amount of moisturising agent channelled to the spray jets (10) can be adjusted by means of the adjustement device (15) also as a function of the temperature in the cooling zone (5) of the dryer (1) and/or the humidity and/or the temperature of the paper web (2) downstream of the moisturising device (8).
  4. A device according to one of the forgoing claims, characterised in that a moisturising agent and compressed air can be admitted to the spray jets (10) for the purpose of blowing out the moisturising agent.
  5. A device according to one of the forgoing claims, characterised in that each of the spray chambers (9) is arrayed in a dedicated suction chamber (18), which can be sucked out by means of at least one dedicated extraction fan (20) blowing out into the dryer (1).
  6. A device according to claim 5, characterised in that at least one cooler (22) is arrayed upstream of each extraction fan (20).
  7. A device according to claim 6, characterised in that each cooler (22) is connected via a condensation drainage conduit (23) to an oil vaporiser (25) arrayed in the dryer (1), preferably in the area of the temperature maintenance zone (4) of the said dryer (1) and in that at least one water separator (24) is arrayed downstream of each cooler (22).
  8. A device according to one of the forgoing claims 5 - 7, characterised in that air squeegees (26) through which compressed air can be admitted are provided at the entrance and the exit of the suction chambers (18).
  9. A device according to one of the forgoing claims, characterised in that drop catchers (27) are situated at the lower ends of the bulkheads of the upper spray chamber (9) and suction chamber (18).
  10. A device according to one of the forgoing claims, characterised in that the spray chambers (9) and the suction chambers (18) have a roof- or v-shaped form.
EP00100099A 1999-01-19 2000-01-07 Device for conditioning a paper web Expired - Lifetime EP1022136B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19901801A DE19901801C2 (en) 1999-01-19 1999-01-19 Device for conditioning a paper web
DE19901801 1999-01-19

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EP1022136A2 EP1022136A2 (en) 2000-07-26
EP1022136A3 EP1022136A3 (en) 2002-05-15
EP1022136B1 true EP1022136B1 (en) 2005-09-14

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US (1) US6223448B1 (en)
EP (1) EP1022136B1 (en)
JP (1) JP2000211111A (en)
CN (1) CN1261027A (en)
DE (2) DE19901801C2 (en)

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Also Published As

Publication number Publication date
DE19901801A1 (en) 2000-07-27
EP1022136A3 (en) 2002-05-15
DE50011142D1 (en) 2005-10-20
JP2000211111A (en) 2000-08-02
US6223448B1 (en) 2001-05-01
CN1261027A (en) 2000-07-26
EP1022136A2 (en) 2000-07-26
DE19901801C2 (en) 2003-12-11

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