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EP0065783B1 - Device for drying printed webs in a printing machine - Google Patents

Device for drying printed webs in a printing machine Download PDF

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Publication number
EP0065783B1
EP0065783B1 EP82104556A EP82104556A EP0065783B1 EP 0065783 B1 EP0065783 B1 EP 0065783B1 EP 82104556 A EP82104556 A EP 82104556A EP 82104556 A EP82104556 A EP 82104556A EP 0065783 B1 EP0065783 B1 EP 0065783B1
Authority
EP
European Patent Office
Prior art keywords
drying
air
printing
hoods
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82104556A
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German (de)
French (fr)
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EP0065783A1 (en
Inventor
Helmut Dr. Helbig
Manfred Verlemann
Günter Köwener
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0065783A1 publication Critical patent/EP0065783A1/en
Application granted granted Critical
Publication of EP0065783B1 publication Critical patent/EP0065783B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • 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
    • B41F23/0403—Drying webs
    • B41F23/0423—Drying webs by convection
    • B41F23/0426—Drying webs by convection using heated air

Definitions

  • the invention relates to a device for drying printed webs in a printing press according to the preamble of claim 1 (DE-A-2150 259).
  • the performance of printing machines essentially depends on the speed at which the printed webs can be dried, so that the achievable printing performance is determined more by the drying speed than by the machine speed which is possible per se.
  • the drying performance can be increased by increasing the temperature of the drying air, with which the saturation limit increases, and by increasing the air throughput.
  • the temperature of the drying air must be kept below areas where damage or shrinkage of the material could occur, and the air flow cannot be increased arbitrarily, especially since the circulation and the heating of considerable amounts of air cause considerable costs.
  • a partial amount is constantly branched off from the amount of circulating air that a fan blows through the drying hood assigned to the printing unit and fed to a system for recovering the solvent.
  • the continuously diverted partial quantity is replaced by a corresponding quantity of fresh air which enters the web through the inlet slots of the drying hood.
  • the object of the invention is to design the device according to the preamble of patent claim 1 in such a way that there is little exhaust air to be cleaned, so that cleaning systems can be installed at reasonable costs.
  • the inking unit drying and the bridge drying are connected in series in a dry air circuit, not only can the amount of air held in the circuit be reduced, but this is also loaded with solvent twice with each circulation, so that high solvent concentrations can be reached earlier. The desired high solvent concentrations would not be achievable if the drying air were diluted by entering the wrong air. Since the inlet and outlet slots for the web cannot be reduced arbitrarily because the web flutters, the false air is extracted according to the invention to prevent entry into the slot areas. Taking into account the false air that is still sucked in, the circuit can be set so that the air discharged from the mixing chamber has the desired high concentration and the circulated air circulated in the circuit is kept at the permissible concentration values through the entry of supply air and false air. It is also possible to remove all or part of the circulated air after it has been enriched to the highest permissible concentration value and to replace it with fresh air.
  • the air can be circulated until it has been enriched with solvent to a preselectable value, for example 0.5 LEL (lower explosion limit).
  • a preselectable value for example 0.5 LEL (lower explosion limit).
  • the explosion protection regulations allow solvent concentrations of up to 0.5 LEL, which are more than 100 times as high as the legally permissible solvent concentrations of the exhaust air blown into the open. For example, at temperatures above 50 ° C, the solvent concentration corresponding to 0.5 LEL is still far below the saturation limit of the drying air of solvent, so that the drying properties of the circulating drying air are not appreciably impaired up to a concentration level corresponding to 0.5 LEL.
  • the drying air can therefore be loaded with solvent up to the maximum concentration value permitted by the explosion protection regulations, so that the drying air can be used for drying in the highest permissible manner and only the smallest possible amount of exhaust air has to be delivered to downstream cleaning systems.
  • Bypass lines can be provided for partially bridging the drying hoods of the printing units, because the amount of air required for drying the intermediate inking unit will usually be smaller than that required for drying the bridge.
  • Fresh air is drawn in by a fan 3 via a mixing chamber 4, as is known for example from DE-B-1 262 296, heated in a heating chamber 5 and measured by a thermometer 6, via a distributor pipe 7 to the individual slot nozzles 1.1 of the bridge 1 or the individual slot blowers 2.2 of the printing unit drying device 2.
  • the hot air laden with solvents is extracted together with the leaked air drawn in from the side of the printed web by a fan 8 via a common suction line 9 from the drying boxes 1.3 or 2.3 and fed to the mixing chamber 4, where, depending on the position of the control flap 4.1 either released into the open or possibly returned to the drying process together with fresh air.
  • Fig. 3 the arrangement of the bridge 1 and the drying boxes 2 on the printing unit can be seen.
  • the drying process will now be explained using the course of the web to be printed.
  • the web 11 is drawn off from a supply roll 12 and fed to the printing unit via guide rollers 13, where it is printed by the individual plate cylinders 15. Between the individual plate cylinders 15 drying boxes 2.3 are arranged, in which warm air is blown onto the freshly printed web 11.
  • the web is then fed to the drying box 1 on the bridge 16, where the remaining solvents of the web 11 are removed by blowing warm air.
  • the web then comes via a pressure monitoring station 17 to the winding station 18, where it is wound up into a supply roll 19.
  • the air can be further heated by a further heating chamber 5.2 if this is necessary.
  • a heat exchanger 33 is arranged in the line 31, 32 and emits its heat via a line 34 to a heat exchanger 35 arranged in the line 21. This reduces the heat output to be applied by the heating chamber 5.1.
  • a temperature sensor 36 is arranged in line 32, the signal of which is processed in a control device 37, which either supplies the heating chamber 5.2 with current or actuates a valve 38 arranged in line 34, depending on whether the printing unit 2 receives warmer or colder air should.
  • the warm air passes from line 32 to the drying boxes 2 arranged on the printing unit, each of which can be shut off individually by means of flaps 7.1 or 9.1.
  • the supply air can also be supplied through a bypass 39, in which a control flap 40 is arranged, bypassing the drying boxes 2 directly or in part to the suction line 9.
  • a pressure measuring device 41 is arranged behind the fan 27, by means of which the servomotor 42 moving the control flap 40 is influenced.
  • a fan 43 is arranged in line 9, which sucks the air to be circulated from the drying boxes 2 arranged on the printing unit and forwards it to the mixing chamber 4.
  • a bypass 44 branches off from line 31 and leads to line 9, into which it opens in front of fan 43. The flow through the bypass 44 can be adjusted by an adjusting flap 45.
  • the control flap 4.1 of the mixing chamber 4 is controlled by a servomotor 4.2.
  • a measuring device 46, 47, 48 is arranged, with which the concentration of solvents of the warm air circulating in the lines is measured.
  • the values ejected by the measuring devices 46 to 48 are processed and converted into control pulses for the servomotor 4.2.
  • the measuring devices 46 to 48 work continuously and are adjustable to the organic solvents used. Your control signals can be set to a percentage LEL value (lower explosion limit), preferably 50% according to the current safety rules.
  • control flap 4.1 If the control flap 4.1 has already opened completely or cannot be opened further because it is stuck or because of another obstacle, an output is provided in the associated control electronics, not shown, which is connected to the main drive of the printing press by an electrical line and by means of which the speed of the machine is reduced until the selected and set maximum permissible concentration value is reached again.
  • the measuring devices 46 to 48 are equipped with a self-monitoring device, ie if the concentration control fails, appropriate safety measures are initiated, such as opening the control flap 4.1 or reducing the machine speed.

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

Description

Die Erfindung betrifft eine Vorrichtung zum Trocknen von bedruckten Bahnen in einer Druckmaschine nach dem Oberbegriff des Patentanspruchs 1 (DE-A-2150 259).The invention relates to a device for drying printed webs in a printing press according to the preamble of claim 1 (DE-A-2150 259).

Die Leistung von Druckmaschinen hängt ganz wesentlich von der Geschwindigkeit ab, mit der die bedruckten Bahnen getrocknet werden können, so dass die erreichbaren Druckleistungen mehr durch die Trocknungsgeschwindigkeit als durch die an sich mögliche Maschinengeschwindigkeit bestimmt werden. Die Trocknungsleistung kann durch Erhöhung der Temperatur der Trocknungsluft, mit der die Sättigungsgrenze steigt, und durch Erhöhung des Luftdurchsatzes gesteigert werden. Die Temperatur der Trocknungsluft muss jedoch unterhalb von Bereichen gehalten werden, in denen eine Schädigung oder ein Schrumpfen des Materials eintreten könnte, und der Luftdurchsatz lässt sich auch nicht beliebig steigern, zumal die Umwälzung und das Erwärmen beträchtlicher Luftmengen erhebliche Kosten verursachen.The performance of printing machines essentially depends on the speed at which the printed webs can be dried, so that the achievable printing performance is determined more by the drying speed than by the machine speed which is possible per se. The drying performance can be increased by increasing the temperature of the drying air, with which the saturation limit increases, and by increasing the air throughput. However, the temperature of the drying air must be kept below areas where damage or shrinkage of the material could occur, and the air flow cannot be increased arbitrarily, especially since the circulation and the heating of considerable amounts of air cause considerable costs.

Weitere Beschränkungen ergeben sich aus gesetzlichen Bestimmungen für Abluft, die Lösungsmittelkonzentrationen in der ins Freie abgeblasenen Trocknungsluft nur bis maximal 0,3 g/m3 zulassen, wobei als Lösungsmittel üblicherweise Äthanol, A-Glykol, Ä-Acetat oder Toluol verwendet werden. Die gesetzlich zulässigen Höchstkonzentrationen von Lösungsmitteln in der Abluft in Bezug auf Explosionsschutz werden jedoch gegenwärtig teilweise nicht erreicht, so dass stillschweigend Lösungsmittelkonzentrationen bis 10 g/m3 und mehr geduldet werden. Würden die gesetzlichen Bestimmungen eingehalten werden, wären Reinigungsanlagen erforderlich, deren Kosten wegen der anfallenden grossen Mengen an zu reinigender Abluft etwa die Kosten der Druckmaschinen selbst erreichen würden.Further restrictions result from legal regulations for exhaust air, which allow solvent concentrations in the drying air blown out only up to a maximum of 0.3 g / m 3 , with ethanol, A-glycol, Ä-acetate or toluene usually being used as solvents. However, the legally permissible maximum concentrations of solvents in the exhaust air with regard to explosion protection are currently not being reached, so that solvent concentrations of up to 10 g / m 3 and more are tacitly tolerated. If the legal provisions were observed, cleaning systems would be required, the costs of which would, due to the large quantities of exhaust air to be cleaned, roughly equal the costs of the printing machines themselves.

Bei einer aus der Veröffentlichung DE-A-2150259 bekannten Vorrichtung zum Regeln der Bahntrocknung an einer Tiefdruckrotationsmaschine wird ständig von der Umluftmenge, die ein Gebläse durch die dem Druckwerk zugeordnete Trockenhaube bläst, eine Teilmenge abgezweigt und einer Anlage zur Rückgewinnung des Lösungsmittels zugeführt. Die ständig abgezweigte Teilmenge wird durch eine entsprechende Menge von Frischluft ersetzt, die durch die Eintrittsschlitze der Trockenhaube für die Bahn eintritt. Durch dieses offene Ende können jedoch grosse Mengen von Falschluft eintreten, so dass eine zu grosse Menge von Abluft abzuführen ist.In a device known from the publication DE-A-2150259 for regulating the web drying on a rotogravure printing machine, a partial amount is constantly branched off from the amount of circulating air that a fan blows through the drying hood assigned to the printing unit and fed to a system for recovering the solvent. The continuously diverted partial quantity is replaced by a corresponding quantity of fresh air which enters the web through the inlet slots of the drying hood. Through this open end, however, large amounts of false air can enter, so that too much exhaust air has to be removed.

Aufgabe der Erfindung ist es, die Vorrichtung nach dem Oberbegriff des Patentanspruchs 1 derart auszugestalten, dass nur wenig zu reinigende Abluft anfällt, so dass sich Reinigungsanlagen zu vertretbaren Kosten installieren lassen.The object of the invention is to design the device according to the preamble of patent claim 1 in such a way that there is little exhaust air to be cleaned, so that cleaning systems can be installed at reasonable costs.

Erfindungsgemäss wird diese Aufgabe bei einer Vorrichtung der gattungsgemässen Art durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.According to the invention, this object is achieved in a device of the generic type by the characterizing features of patent claim 1.

Dadurch, dass die Farbwerkstrocknung und die Brückentrocknung in einem Trockenluftkreislauf in Reihe geschaltet sind, kann nicht nur die im Kreislauf gehaltene Luftmenge verringert werden, sondern diese wird bei jedem Umlauf auch zweimal mit Lösungsmittel beladen, so dass sich hohe Lösungsmittelkonzentrationen früher erreichen lassen. Diese gewünschten hohen Lösungsmittelkonzentrationen wären nicht erreichbar, wenn die Trocknungsluft durch Falschluftzutritt verdünnt würde. Da sich die Ein- aus Auslaufschlitze für die Bahn nicht beliebig verkleinern lassen, weil die Bahn flattert, wird die Falschluft erfindungsgemäss zum Verhindern des Eintritts in den Schlitzbereichen abgesaugt. Unter Berücksichtigung der dennoch angesaugten Falschluft kann der Kreislauf so eingestellt werden, dass die aus der Mischkammer abgeführte Luft die gewünschte hohe Konzentration hat und durch den Zutritt von Zuluft und Falschluft die im Kreislauf geführte Umluft gerade auf den zulässigen Konzentrationswerten gehalten wird. Es ist auch möglich, die im Kreislauf geführte Luft nach ihrer Anreicherung auf den höchst zulässigen Konzentrationswert insgesamt oder teilweise abzuführen und durch Frischluft zu ersetzen.Because the inking unit drying and the bridge drying are connected in series in a dry air circuit, not only can the amount of air held in the circuit be reduced, but this is also loaded with solvent twice with each circulation, so that high solvent concentrations can be reached earlier. The desired high solvent concentrations would not be achievable if the drying air were diluted by entering the wrong air. Since the inlet and outlet slots for the web cannot be reduced arbitrarily because the web flutters, the false air is extracted according to the invention to prevent entry into the slot areas. Taking into account the false air that is still sucked in, the circuit can be set so that the air discharged from the mixing chamber has the desired high concentration and the circulated air circulated in the circuit is kept at the permissible concentration values through the entry of supply air and false air. It is also possible to remove all or part of the circulated air after it has been enriched to the highest permissible concentration value and to replace it with fresh air.

In der erfindungsgemässen Vorrichtung lässt sich die Luft solange im Kreislauf führen, bis sie sich auf einen vorwählbaren Wert, beispielsweise 0,5 UEG (untere Explosionsgrenze) mit Lösungsmittel angereichert hat. Die Explosionsschutzbestimmungen lassen Lösungsmittelkonzentrationen bis 0,5 UEG zu, die mehr als hundertmal so hoch sind, wie die gesetzlich zulässigen Lösungsmittelkonzentrationen der ins Freie abgeblasenen Abluft. Beispielsweise bei Temperaturen über 50°C liegt die 0,5 UEG entsprechende Lösungsmittelkonzentration noch weit unter der Sättigungsgrenze der Trocknungsluft an Lösungsmittel, so dass die trocknenden Eigenschaften der im Kreislauf geführten Trocknungsluft bis zu einem 0,5 UEG entsprechenden Konzentrationsgrad merklich nicht beeinträchtigt sind. In der erfindungsgemässen Vorrichtung lässt sich also die Trocknungsluft bis zu dem nach den Explosionsschutzbestimmungen maximal zulässigen Konzentrationswert mit Lösungsmittel beladen, so dass die Trocknungsluft zur Trocknung in der höchst zulässigen Weise ausgenutzt werden kann und nur die geringstmöglichen Mengen an Abluft an nachgeschaltete Reinigungsanlagen abgegeben werden müssen.In the device according to the invention, the air can be circulated until it has been enriched with solvent to a preselectable value, for example 0.5 LEL (lower explosion limit). The explosion protection regulations allow solvent concentrations of up to 0.5 LEL, which are more than 100 times as high as the legally permissible solvent concentrations of the exhaust air blown into the open. For example, at temperatures above 50 ° C, the solvent concentration corresponding to 0.5 LEL is still far below the saturation limit of the drying air of solvent, so that the drying properties of the circulating drying air are not appreciably impaired up to a concentration level corresponding to 0.5 LEL. In the device according to the invention, the drying air can therefore be loaded with solvent up to the maximum concentration value permitted by the explosion protection regulations, so that the drying air can be used for drying in the highest permissible manner and only the smallest possible amount of exhaust air has to be delivered to downstream cleaning systems.

Zum teilweisen Überbrücken der Trockenhauben der Druckwerke können Bypassleitungen vorgesehen werden, weil üblicherweise die für die Zwischenfarbwerkstrocknung benötigte Luftmenge kleiner sein wird als die für die Brückentrocknung benötigte.Bypass lines can be provided for partially bridging the drying hoods of the printing units, because the amount of air required for drying the intermediate inking unit will usually be smaller than that required for drying the bridge.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. In dieser zeigt:

  • Fig. 1 eine schematische Darstellung des Kreislaufs der Brückentrocknung,
  • Fig. 2 eine schematische Darstellung des Kreislaufs der Zwischenfarbwerkstrocknung,
  • Fig. 3 eine Seitenansicht der Flexodruckmaschine in schematischer Darstellung und
  • Fig. 4 eine schematische Darstellung des Trocknungskreislaufes, in dem die Zwischenfarbwerkstrocknung und die Brückentrocknung hintereinandergeschaltet sind.
An embodiment of the invention is explained below with reference to the drawing. In this shows:
  • 1 is a schematic representation of the cycle of bridge drying,
  • 2 shows a schematic representation of the cycle of the intermediate inking unit drying,
  • Fig. 3 is a side view of the flexographic printing machine in a schematic representation and
  • Fig. 4 is a schematic representation of the drying circuit in which the intermediate ink drying and the bridge drying are connected in series.

Mit 1 ist die Brücken- und mit 2 die Druckwerkstrockenvorrichtung bezeichnet. Durch einen Ventilator 3 wird Frischluft über eine Mischkammer 4, wie sie beispielsweise aus der DE-B-1 262 296 bekannt ist, angesaugt, in einer Heizkammer 5 erwärmt und durch ein Thermometer 6 gemessen, über ein Verteilerrohr 7 den einzelnen Schlitzdüsen 1.1 der Brücke 1 bzw. den einzelnen Schlitzbläsern 2.2 der Druckwerkstrockenvorrichtung 2 zugeführt. Von dort wird die mit Lösungsmitteln beladene Warmluft zusammen mit der von der Seite der bedruckten Bahn hereingesaugten Leckluft durch einen Ventilator 8 über eine gemeinsame Absaugleitung 9 aus den Trockenkästen 1.3 bzw. 2.3 abgesaugt und der Mischkammer 4 zugeführt, wo sie je nach Stellung der Stellklappe 4.1 entweder ins Freie entlassen oder eventuell zusammen mit Frischluft wieder dem Trockenprozess zugeführt wird.1 with the bridge and 2 with the printing unit drying device. Fresh air is drawn in by a fan 3 via a mixing chamber 4, as is known for example from DE-B-1 262 296, heated in a heating chamber 5 and measured by a thermometer 6, via a distributor pipe 7 to the individual slot nozzles 1.1 of the bridge 1 or the individual slot blowers 2.2 of the printing unit drying device 2. From there, the hot air laden with solvents is extracted together with the leaked air drawn in from the side of the printed web by a fan 8 via a common suction line 9 from the drying boxes 1.3 or 2.3 and fed to the mixing chamber 4, where, depending on the position of the control flap 4.1 either released into the open or possibly returned to the drying process together with fresh air.

In Fig. 3 ist die Anordnung der Brücke 1 sowie der Trockenkästen 2 am Druckwerk ersichtlich. Der Vorgang derTrocknung wird nun anhand des Laufes der zu bedruckenden Bahn erläutert. Die Bahn 11 wird von einer Vorratsrolle 12 abgezogen, über Leitwalzen 13 dem Druckwerk zugeführt, wo sie durch die einzelnen Klischeezylinder 15 bedruckt wird. Zwischen den einzelnen Klischeezylindern 15 sind Trockenkästen 2.3 angeordnet, in denen Warmluft auf die frisch bedruckte Bahn 11 aufgeblasen wird. Die Bahn wird sodann dem Trockenkasten 1 auf der Brücke 16 zugeleitet, wo die restlichen Lösungsmittel der Bahn 11 durch Aufblasen von Warmluft entzogen werden. Die Bahn kommt dann über eine Druckbeobachtungsstation 17 zur Aufwickelstation 18, wo sie zu einer Vorratsrolle 19 aufgewickelt wird.In Fig. 3 the arrangement of the bridge 1 and the drying boxes 2 on the printing unit can be seen. The drying process will now be explained using the course of the web to be printed. The web 11 is drawn off from a supply roll 12 and fed to the printing unit via guide rollers 13, where it is printed by the individual plate cylinders 15. Between the individual plate cylinders 15 drying boxes 2.3 are arranged, in which warm air is blown onto the freshly printed web 11. The web is then fed to the drying box 1 on the bridge 16, where the remaining solvents of the web 11 are removed by blowing warm air. The web then comes via a pressure monitoring station 17 to the winding station 18, where it is wound up into a supply roll 19.

Eine Erhöhung der Lösungsmittelkonzentration bis auf einen 0,5 UEG entsprechenden Wert lässt sich jedoch bei den anhand der Fig. 1 und 2 erläuterten Zwischenfarbwerks- und Brückentrocknungen wegen der in beiden Kreisläufen notwendigerweise erforderlichen grossen Luftmengen nicht erreichen.However, an increase in the solvent concentration to a value corresponding to 0.5 LEL cannot be achieved in the intermediate inking unit and bridge drying explained with reference to FIGS. 1 and 2 because of the large amounts of air that are necessary in both circuits.

Um die gewünschte hohe Lösungsmittelkonzentration der Trocknungsluft zu erreichen, werden in der aus Fig. 4 ersichtlichen Weise die anhand der Fig. 1 und 2 erläuterten bekannten Kreisläufe in Reihe geschaltet. Dadurch lässt sich die pro Zeiteinheit umgewälzte Luft beispielsweise von 200 M 3/Min. auf 100 M 3/min. reduzieren.In order to achieve the desired high solvent concentration of the drying air, the known circuits explained with reference to FIGS. 1 and 2 are connected in series in the manner shown in FIG. 4. This allows the air circulated per unit of time, for example from 200 M 3 / M in. To 100 M 3 / min. to reduce.

Bei der Reihenschaltung entsprechend Fig. 4 wird Luft durch eine einzige Mischkammer 4 über eine Leitung 21 von einem Ventilator 22 angesaugt und in einer Heizkammer 5.1 vorgewärmt, die mittels eines Temperaturfühlers 23 und einer dazugehörigen Steuereinrichtung 24 gesteuert wird. Die Warmluft gelangt zu dem Trockenkasten der Brücke 1 und wird von dort zusammen mit der Leckluft durch eine Saugleitung 26 mittels eines Ventilators 27 den Trockenkästen 2 am Druckwerk durch Leitungen 31, 32 zugeführt. Falls am Druckwerk relativ weniger Trocknung als an der Brücke 1 notwendig ist, kann die Druckwerkstrocknung durch einen Bypass 28 teilweise umgangen werden. Zum Einschalten des Bypasses 28 sind Klappen 29, 30 vorgesehen.4, air is drawn in through a single mixing chamber 4 via a line 21 by a fan 22 and preheated in a heating chamber 5.1, which is controlled by means of a temperature sensor 23 and an associated control device 24. The warm air arrives at the drying box of the bridge 1 and is fed from there together with the leakage air through a suction line 26 by means of a fan 27 to the drying boxes 2 at the printing unit through lines 31, 32. If relatively less drying is required on the printing unit than on the bridge 1, the printing unit drying can be partially bypassed by a bypass 28. Flaps 29, 30 are provided for switching on the bypass 28.

Die Luft kann durch eine weitere Heizkammer 5.2 weiter angewärmt werden, wenn dies notwendig ist. In der Leitung 31, 32 ist ein Wärmetauscher 33 angeordnet, der seine Wärme über eine Leitung 34 an einen in der Leitung 21 angeordneten Wärmetauscher 35 abgibt. Dadurch reduziert sich die von der Heizkammer 5.1 aufzubringende Wärmeleistung. In der Leitung 32 ist ein Temperaturfühler 36 angeordnet, dessen Signal in einer Steuereinrichtung 37 verarbeitet wird, die entweder die Heizkammer 5.2 mit Strom beschickt oder ein in der Leitung 34 angeordnetes Ventil 38 betätigt, je nachdem, ob das Druckwerk 2 wärmere oder kältere Luft erhalten soll. Die Warmluft gelangt von der Leitung 32 zu den am Druckwerk angeordneten Trockenkästen 2, der jeder für sich durch Stellklappen 7.1 bzw. 9.1 abgesperrt werden können. Die Zuluft kann aber auch durch einen Bypass 39, in dem eine Stellklappe 40 angeordnet ist, unter Umgehung der Trockenkästen 2 direkt oder zum Teil der Absaugleitung 9 zugeführt werden. Hinter dem Ventilator 27 ist ein Druckmessgerät 41 angeordnet, mit dem der die Stellklappe 40 bewegende Stellmotor 42 beeinflusst wird. In der Leitung 9 ist ein Ventilator 43 angeordnet, der die umzuwälzende Luft von den am Druckwerk angeordneten Trokkenkästen 2 absaugt und an die Mischkammer 4 weiterleitet. Von der Leitung 31 zweigt ein Bypass 44 ab, der zur Leitung 9 führt, in die er vor dem Ventilator 43 einmündet. Der Durchfluss durch den Bypass 44 kann durch eine Stellklappe 45 eingestellt werden.The air can be further heated by a further heating chamber 5.2 if this is necessary. A heat exchanger 33 is arranged in the line 31, 32 and emits its heat via a line 34 to a heat exchanger 35 arranged in the line 21. This reduces the heat output to be applied by the heating chamber 5.1. A temperature sensor 36 is arranged in line 32, the signal of which is processed in a control device 37, which either supplies the heating chamber 5.2 with current or actuates a valve 38 arranged in line 34, depending on whether the printing unit 2 receives warmer or colder air should. The warm air passes from line 32 to the drying boxes 2 arranged on the printing unit, each of which can be shut off individually by means of flaps 7.1 or 9.1. The supply air can also be supplied through a bypass 39, in which a control flap 40 is arranged, bypassing the drying boxes 2 directly or in part to the suction line 9. A pressure measuring device 41 is arranged behind the fan 27, by means of which the servomotor 42 moving the control flap 40 is influenced. A fan 43 is arranged in line 9, which sucks the air to be circulated from the drying boxes 2 arranged on the printing unit and forwards it to the mixing chamber 4. A bypass 44 branches off from line 31 and leads to line 9, into which it opens in front of fan 43. The flow through the bypass 44 can be adjusted by an adjusting flap 45.

Die Stellklappe 4.1 der Mischkammer 4 ist durch einen Stellmotor 4.2 steuerbar eingerichtet. In der Leitung 26 vor dem Ventilator 27, in der Leitung 9 zwischen den Bypässen 39 und 44 sowie nach dem Ventilator 43 ist je ein Messgerät 46, 47, 48 angeordnet, mit dem die Konzentration an Lösungsmitteln der in den Leitungen zirkulierenden Warmluft gemessen wird. In einer nicht dargestellten Steuerelektrik werden die von den Messgeräten 46 bis 48 ausgeworfenen Werte verarbeitet und in Steuerimpulse für den Stellmotor 4.2 umgeformt. Die Messgeräte 46 bis 48 arbeiten kontinuierlich und sind einstellbar auf die verwendeten organischen Lösungsmittel. Ihre Steuersignale sind einstellbar auf einem prozentualen UEG-Wert (untere Explosionsgrenze), nach den derzeitigen Sicherheitsregeln vorzugsweise 50%. Falls die Stellklappe 4.1 bereits ganz geöffnet hat oder sich nicht weiter öffnen lässt, weil sie klemmt oder wegen eines sonstigen Hindernisses, ist in der dazugehörigen nicht dargestellten Steuerelektrik ein Ausgang vorgesehen, der durch eine elektrische Leitung mit dem Hauptantrieb der Druckmaschine verbunden ist und über den die Geschwindigkeit der Maschine solange reduziert wird, bis der gewählte und eingestellte maximal zulässige Konzentrationswert wieder erreicht ist. Die Messgeräte 46 bis 48 sind mit einer Selbstüberwachungseinrichtung ausgerüstet, d.h. bei Versagen der Konzentrationskontrolle werden entsprechende Sicherheitsmassnahmen eingeleitet, wie Öffnen der Steuerklappe 4.1 bzw. Reduktion der Maschinengeschwindigkeit.The control flap 4.1 of the mixing chamber 4 is controlled by a servomotor 4.2. In the line 26 in front of the fan 27, in the line 9 between the bypasses 39 and 44 and after the fan 43, a measuring device 46, 47, 48 is arranged, with which the concentration of solvents of the warm air circulating in the lines is measured. In a control electronics, not shown, the values ejected by the measuring devices 46 to 48 are processed and converted into control pulses for the servomotor 4.2. The measuring devices 46 to 48 work continuously and are adjustable to the organic solvents used. Your control signals can be set to a percentage LEL value (lower explosion limit), preferably 50% according to the current safety rules. If the control flap 4.1 has already opened completely or cannot be opened further because it is stuck or because of another obstacle, an output is provided in the associated control electronics, not shown, which is connected to the main drive of the printing press by an electrical line and by means of which the speed of the machine is reduced until the selected and set maximum permissible concentration value is reached again. The measuring devices 46 to 48 are equipped with a self-monitoring device, ie if the concentration control fails, appropriate safety measures are initiated, such as opening the control flap 4.1 or reducing the machine speed.

Claims (2)

1. Apparatus for drying printed webs in a printing press, preferably in a flexographic printing press, wherein heated air is blown against the web as it travels through drying chambers (1) or is covered by drying hoods (2.3), part of said air is circulated until a desired solvent concentration has been reached, part of said air is continually supplied as fresh air, and the air that has been withdrawn from circulation and has the desired solvent concentration is supplied to an afterburner or a recovering plant, characterized in that the drying chamber (1) on a bridge (16) disposed between the printing mechanisms and a succeeding station, the parallel-connected drying hoods (2.3) for the individual printing mechanisms, the mixing chamber (4), the circulating fan (3) and the heating chamber (5) are connected in series by connecting pipes and at least the inlet slots of the drying chamber (1) and of the drying hoods (2.3) are surrounded by annular suction seals.
2. Apparatus according to claim 1, characterized in that by-pass lines (28, 39, 44) are provided for partly by-passing the drying hoods (2.3) for the printing mechanisms.
EP82104556A 1981-05-25 1982-05-25 Device for drying printed webs in a printing machine Expired EP0065783B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813120738 DE3120738A1 (en) 1981-05-25 1981-05-25 METHOD AND DEVICE FOR DRYING PRINTED OR COATED FILMS.
DE3120738 1981-05-25

Publications (2)

Publication Number Publication Date
EP0065783A1 EP0065783A1 (en) 1982-12-01
EP0065783B1 true EP0065783B1 (en) 1986-01-29

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EP82104556A Expired EP0065783B1 (en) 1981-05-25 1982-05-25 Device for drying printed webs in a printing machine

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US (1) US4502228A (en)
EP (1) EP0065783B1 (en)
DE (2) DE3120738A1 (en)

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Also Published As

Publication number Publication date
EP0065783A1 (en) 1982-12-01
DE3268772D1 (en) 1986-03-13
DE3120738A1 (en) 1982-12-09
US4502228A (en) 1985-03-05

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