EP0695828A2 - Apparatus for alternatively treating a moving web - Google Patents

Apparatus for alternatively treating a moving web Download PDF

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Publication number
EP0695828A2
EP0695828A2 EP95108358A EP95108358A EP0695828A2 EP 0695828 A2 EP0695828 A2 EP 0695828A2 EP 95108358 A EP95108358 A EP 95108358A EP 95108358 A EP95108358 A EP 95108358A EP 0695828 A2 EP0695828 A2 EP 0695828A2
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EP
European Patent Office
Prior art keywords
web
drying
coating
group
coating unit
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.)
Granted
Application number
EP95108358A
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German (de)
French (fr)
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EP0695828B1 (en
EP0695828A3 (en
Inventor
Bernhard Kohl
Stefan Reich
Wilfried Kraft
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Voith Patent GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
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Publication of EP0695828A2 publication Critical patent/EP0695828A2/en
Publication of EP0695828A3 publication Critical patent/EP0695828A3/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D21H23/72—Plural serial stages only
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper

Definitions

  • the invention relates to a device for the optional treatment of a running web, preferably of paper or cardboard with the features specified in the preamble of claim 1 in in-line arrangements.
  • the web running routes are still relatively long.
  • Figure 8 shows the subsequent installation of the coating unit for applying the coating medium on both sides in an existing paper machine.
  • the coating unit is followed by the installation of contactless dryers arranged on both sides of the web, so that an arrangement down to the basement was necessary.
  • this variant also has disadvantages with regard to the necessary construction measures and the operating options.
  • the invention is therefore based on the object of providing a device with which the surface treatment with coating liquid or the impregnation of a running web can be carried out with little effort, the coating units required for this also being able to be retrofitted into existing dryer sections of a paper machine and yet only a small installation space, a shorter overall length, good operating options from the base of the paper machine and the shortest possible free paper draws for the drying process are possible.
  • the short free paper draws are intended to enable high running efficiency, particularly at high speeds and low web strengths.
  • the invention it is easily possible to retrofit an existing conventional dryer section with coating units and contactless dryers for surface treatment of the running paper or cardboard web. It is also possible to use the invention in a new construction of a paper machine.
  • the dryer section can be one that is described, for example, in DE 4328554 and can consist of initially single-row dryer groups, each with a single endless felt. The last one-felt dryer group is then followed by at least one two-felt dryer group with some lower cylinders and some upper cylinders, as well as with an upper and an under felt.
  • the dryer groups can of course also be designed in three rows or inclined in the so-called "V" shape.
  • the first coating unit to be installed is preferably arranged behind a two-row drying cylinder group. This has the advantage that the web, if desired, with a residual moisture content of z. B. only 2% can enter the first coating unit.
  • the dryer section can be used for higher speeds (since the previously removed drying cylinders are missing and the desired degree of drying is to be achieved).
  • drying cylinders need to be removed if an existing dryer section is to be retrofitted for surface treatment or impregnation of the web.
  • the path of the paper web does not have to leave the normal area of the dryer section at any point, so that in particular the coating units can always be operated approximately from the base of the paper machine.
  • the short free paper draws allow the application area to be passed through with web dryness levels of ⁇ 80% if the application units are not used.
  • Figures 1 to 7 show schematic side views of various embodiments of dryer sections consisting of several dryer groups, which contain coating units for treating the paper or cardboard web.
  • FIG. 1 shows three double-row dryer groups 10, 11, 12 arranged one behind the other, namely so-called two-felt dryer groups. They each consist of the lower cylinders 15 with a conventional lower felt UF (felt or dryer fabric) and upper cylinders 16 with an upper felt OF.
  • FIG. 1 shows a first drying group 10, a second drying group 12 and a drying group 11 arranged between them.
  • This intermediate drying group 11 can contain only one or more upper cylinders 16 and at least one lower cylinder 15 (not shown). Drives are not shown since they are of a conventional type.
  • a first coating unit 35 is arranged for treating one side (eg the underside) of the web 40.
  • the coating unit 35 for one-sided application of a liquid coating medium is here assigned to a pair of rollers, consisting of two rollers forming a press nip with one another.
  • the roller 1 is the application roller on which a (nozzle) application unit 20 acts and the roller 2 is the counter roller.
  • the coating unit 35 is followed by a deflection roller 30 wrapped in the web 40 and located at the level of the lower drying cylinders 15 of the first and second drying cylinder groups 10 and 12. This can be heated or unheated, rotating or fixed.
  • the coating unit 35 is retrofitted into an already existing drying section, an existing, lower, heatable drying cylinder is used as the deflection roller 39.
  • the coated side of the web 40 is dried by means of a contactless drying device 21 arranged on the circumference of the roller 30 to such an extent that it can then be dried further by contact with a further upper dryer 16 of the drying group 11. (If necessary, an spreader roller can be arranged before or after the deflection roller 30.)
  • the web 40 runs over paper guide rollers 22, from where it is in the upward direction to the next coating unit 35 'for treating the other side, e.g. B. the top of the web is supplied.
  • the web again passes through a pair of rolls consisting of rolls 1 and 2, forming a press nip.
  • This coating unit 35 ' preferably comprises a special nozzle applicator 20' according to patent application P 44 13 232.8.
  • Another contactless drying device 21 on the roller 30 ' is arranged downstream of the coating unit 35'.
  • FIG. 2 shows, it is also possible to use the deflecting rollers 30 and 30 'without a contactless dryer 21.
  • FIGS. 3 and 4 show the use of non-contact web deflecting means instead of deflecting rollers 30 and 30 ', FIG. 3 showing the so-called “air turn” 39' and FIG. 4 the so-called “air can” 39.
  • the air turns and air cans are equipped with air nozzles for heated or unheated air, which create an air cushion for the purpose of deflecting the web.
  • An air turn is usually subjected to cold air and is used to divert the web.
  • An Air can that works with heated air is a web deflection device and a web dryer at the same time.
  • the web 40 is then further dried in the next or second drying group 12, after which further coating units (not shown in the figures) can also be arranged.
  • the deflecting roller 30 ' can also be heated or unheated. In the latter case, this then represents a simple web guide roller.
  • the roller 30 ' can also rotate or be stationary like the roller 30.
  • FIGS. 1 to 4 operating passages 23, which are provided with railings and a collecting trough for spraying off the liquid application medium, are also shown under the coating units 35 and 35 '.
  • FIG. 5 shows the subsequent installation of coating units 35 and 35 'in an already existing double-row dryer section.
  • the drive must be converted so that this cylinder can run counter to the original direction of rotation and can be controlled separately.
  • FIGS. 6 and 7 Two further variants of the web guide are shown in FIGS. 6 and 7.
  • the first coating unit 35 can also be connected to a single-row dryer group 13 consisting of drying cylinders 17.
  • the paper web 40 can have a residual moisture content of between approximately 2% and approximately 6%, depending on the existing operating conditions and the type of subsequently applied
  • the drying group 13 has an endless felt F which, together with the web 40, runs alternately over the drying cylinders 17 and deflection rollers 18. It is conceivable that the deflecting rollers 18 can also be designed as suction rollers with an external suction box 19.
  • the web 40 again passes through a single-row dryer group 14, which is also like the dryer group 13. Paper guide rollers 22 then transport the web 40 to the second coating unit 35 ′ and then to the roller 30 ′ with the contactless dryers 21.
  • the web 40 is subjected to further drying in a double-row dryer group 12, as is already shown in FIG. 1.
  • FIG. 7 shows that the application of the liquid coating medium to the other side of the web 40 can take place immediately after the contactless drying, which was carried out after the first application with the coating unit 35.
  • the second contactless drying and the contact drying with the drying group 12 then take place in the same way as in FIGS. 1, 2 and 3.

Landscapes

  • Paper (AREA)
  • Replacement Of Web Rolls (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Advancing Webs (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

The assembly for the selective coating o a moving web such as of paper or cardboard, for surface coating or impregnation, has an initial coating station (35) to coat one side of the web (40), following a dryer group (10). A further coating station is in front of a further drying group (12), to act on the other side of the web (40). The non-contact dryer (12) is formed by drying cylinders (30,30') acting as deflection rollers.

Description

Die Erfindung betrifft eine Einrichtung zur wahlweisen Behandlung einer laufenden Bahn, vorzugsweise aus Papier oder Karton mit den im Oberbegriff des Anspruches 1 angegebenen Merkmalen in In-Line Anordnungen.The invention relates to a device for the optional treatment of a running web, preferably of paper or cardboard with the features specified in the preamble of claim 1 in in-line arrangements.

Zum Stand der Technik wird auf folgende Druckschriften hingewiesen:

  • D1: Voith-Druck P 2771
  • D2: DE 43 13 628
Aus der D1 ist als Streichaggregat der sogenannte "Speedsizer" (mit dem der Auftrag des Streichmediums auf beide Seiten der Bahn gleichzeitig erfolgt) insbesondere aus den Abb. 2 bis 8 entnehmbar, wobei die Abbildungen 6 bis 8 bereits einfachere Bahnführungen zeigen.The following publications are referred to the state of the art:
  • D1: Voith printing P 2771
  • D2: DE 43 13 628
The so-called "Speedsizer" (with which the coating medium is applied to both sides of the web at the same time) can be inferred from the D1 as a coating unit, in particular from FIGS. 2 to 8, wherein Figures 6 to 8 already show simpler web guides.

Bei all diesen dargestellten Beispielen sind die Bahnlaufstrecken (Papierzüge) noch relativ lang. Insbesondere wird das bei der Abbildung 8 deutlich, in der der nachträgliche Einbau des Streichaggregates zum beidseitigen Auftragen des Streichmediums in eine vorhandene Papiermaschine dargestellt ist. An das Streichaggregat schließt sich der Einbau von beidseitig der Bahn angeordneten kontaktlosen Trocknern an, wodurch eine Anordnung bis in den Keller erfolgen mußte. Neben den langen Papierzügen bringt diese Variante auch hinsichtlich der notwendigen Baumaßnahmen und der Bedienmöglichkeit Nachteile mit sich.In all of the illustrated examples, the web running routes (paper trains) are still relatively long. This is particularly evident in Figure 8, which shows the subsequent installation of the coating unit for applying the coating medium on both sides in an existing paper machine. The coating unit is followed by the installation of contactless dryers arranged on both sides of the web, so that an arrangement down to the basement was necessary. In addition to the long paper draws, this variant also has disadvantages with regard to the necessary construction measures and the operating options.

Ebenfalls lange Bahnlaufstrecken für den Einbau von Streichaggregaten und kontaktlosen Trocknern, die sich hierbei in die Höhe erstrecken, sind bei der D2 notwendig, mit ebensolchen Nachteilen wie sie bei der D1 aufgezeigt wurden.Long web running distances for the installation of coating units and contactless dryers, which in this case extend upwards, are necessary with the D2, with the same disadvantages as were shown with the D1.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Einrichtung zu schaffen, mit der die Oberflächen-Behandlung mit Beschichtungsflüssigkeit bzw. das Imprägnieren einer laufenden Bahn mit nur geringem Aufwand erfolgen kann, wobei die dazu notwendigen Streichaggregate auch nachträglich in bereits vorhandene Trockenpartien einer Papiermaschine einbaubar sind und dennoch ein nur geringer Bauraum, eine geringere Baulänge, gute Bedienmöglichkeiten vom Papiermaschinenboden aus und möglichst kurze freie Papierzüge für den Trocknungsvorgang möglich sind. Zudem soll durch die kurzen freien Papierzüge ein hoher Laufwirkungsgrad, insbesondere bei hohen Geschwindigkeiten und niedrigen Bahnfestigkeiten ermöglicht werden.The invention is therefore based on the object of providing a device with which the surface treatment with coating liquid or the impregnation of a running web can be carried out with little effort, the coating units required for this also being able to be retrofitted into existing dryer sections of a paper machine and yet only a small installation space, a shorter overall length, good operating options from the base of the paper machine and the shortest possible free paper draws for the drying process are possible. In addition, the short free paper draws are intended to enable high running efficiency, particularly at high speeds and low web strengths.

Erfindungsgemäß wird die Aufgabe durch die kennzeichnenden Merkmale des Hauptanspruches gelöst.According to the invention the object is achieved by the characterizing features of the main claim.

Gemäß der Erfindung ist es problemlos möglich, eine bereits vorhandene herkömmliche Trockenpartie mit Streichaggregaten und kontaktlosen Trocknern zur Oberflächenbehandlung der laufenden Papier- oder Kartonbahn nachzurüsten. Genauso ist es auch möglich, die Erfindung bei einem Neubau einer Papiermaschine zu verwenden.According to the invention, it is easily possible to retrofit an existing conventional dryer section with coating units and contactless dryers for surface treatment of the running paper or cardboard web. It is also possible to use the invention in a new construction of a paper machine.

Die Trockenpartie kann dabei eine solche sein, die beispielsweise in der DE 4328554 beschrieben ist und aus zunächst einreihigen Trockengruppen mit je einem einzigen endlosen Filz bestehen kann. Auf die letzte Ein-Filz-Trockengruppe folgt dann wenigstens eine Zwei-Filz-Trockengruppe mit einigen unteren Zylindern und einigen oberen Zylindern, sowie mit einem Ober- und einem Unterfilz. Die Trockengruppen können selbstverständlich auch dreireihig oder schräggestellt in sogenannter "V"-Form ausgeführt sein.The dryer section can be one that is described, for example, in DE 4328554 and can consist of initially single-row dryer groups, each with a single endless felt. The last one-felt dryer group is then followed by at least one two-felt dryer group with some lower cylinders and some upper cylinders, as well as with an upper and an under felt. The dryer groups can of course also be designed in three rows or inclined in the so-called "V" shape.

Das einzubauende erste Streichaggregat ist bevorzugt hinter einer zweireihigen Trockenzylindergruppe angeordnet. Das hat den Vorteil, daß die Bahn, falls gewünscht, mit einem Restfeuchtigkeitsgehalt von z. B. nur 2 % in das erste Streichaggregat einlaufen kann.The first coating unit to be installed is preferably arranged behind a two-row drying cylinder group. This has the advantage that the web, if desired, with a residual moisture content of z. B. only 2% can enter the first coating unit.

Mit der erfindungsgemäßen Lösung ist es auch möglich, bei nicht erwünschter Oberflächenbehandlung bzw. Imprägnierung der Bahn, die in die Trockenpartie integrierten Streichaggregate zeitweilig nicht zu benutzen. Bei der Nicht-Benutzung der Streichaggregate kann der Bahnverlauf nahezu unverändert bleiben. In diesem Fall kann die Nachtrockenpartie für höhere Geschwindigkeiten (da ja die vorher ausgebauten Trockenzylinder fehlen und der gewünschte Trocknungsgrad erreicht werden soll) genützt werden.With the solution according to the invention, it is also possible, if the surface treatment or impregnation of the web is not desired, to temporarily not use the coating units integrated in the dryer section. If the coating units are not used, the course of the web can remain almost unchanged. In this case, the dryer section can be used for higher speeds (since the previously removed drying cylinders are missing and the desired degree of drying is to be achieved).

Es brauchen insgesamt nur wenige (ca. 3) Trockenzylinder entfernt zu werden, wenn eine vorhandene Trockenpartie nachträglich zwecks Oberflächenbehandlung bzw. Imprägnierung der Bahn umgerüstet werden soll.Overall, only a few (approx. 3) drying cylinders need to be removed if an existing dryer section is to be retrofitted for surface treatment or impregnation of the web.

Der Laufweg der Papierbahn muß an keiner Stelle den normalen Raum der Trockenpartie verlassen, so daß insbesondere die Bedienung der Streichaggregate immer in etwa vom Papiermaschinenboden aus erfolgen kann.The path of the paper web does not have to leave the normal area of the dryer section at any point, so that in particular the coating units can always be operated approximately from the base of the paper machine.

Durch die erfindungsgemäße Anordnung der Streichaggregate, mit denen an getrennten Stellen jeweils einmal die Unterseite und einmal die Oberseite der Bahn behandelt wird und den sich anschließenden Bahnumlenkungsmitteln, z. B. Umlenkwalzen oder berührungslose Umlenkeinrichtungen, die mit unbeheizter oder beheizter Luft arbeiten und unter den Namen "Air turn" oder "Air can" bekannt sind, werden die Vorteile, die in einer geringen Baulänge, einem geringen Bauraum sowie sehr kurzen freien Papierzügen liegen, erreicht. Dabei ist es vorteilhaft, kontaktlose Trockner einem als Umlenkwalze ausgebildeten Trockenzylinder zuzuordnen, im Gegensatz zum Stand der Technik, wo die kontaktlosen Trockner beidseitig an der Bahn angeordnet waren und dadurch lange Papierzüge verursachten.Due to the arrangement of the coating units according to the invention, with which the underside and once the top of the web are treated at separate points and the subsequent web deflection means, for. B. deflection rollers or non-contact deflection devices that work with unheated or heated air and are known under the name "Air turn" or "Air can", the advantages are that they have a small overall length, a small installation space and very short free paper draws, reached. In this case, it is advantageous to assign contactless dryers to a drying cylinder designed as a deflection roller, in contrast to the prior art, where the contactless dryers were arranged on both sides of the web and thereby caused long paper draws.

Durch kurze freie Papierzüge sind auch höhere Bahngeschwindigkeiten, ohne daß es zu Bahnabrissen kommt, erreichbar.Higher web speeds can also be achieved with short free paper runs without web breaks.

Außerdem erlauben die kurzen freien Papierzüge ein Durchfahren des Auftragsbereiches bei Bahntrockengehalten von ≦ 80 % im Falle der Nichtbenutzung der Auftragswerke.In addition, the short free paper draws allow the application area to be passed through with web dryness levels of ≦ 80% if the application units are not used.

Die Erfindung wird nachfolgend an Hand der zeichnerisch dargestellten Ausführungsbeispiele erläutert:
Die Figuren 1 bis 7 zeigen schematische Seitenansichten auf verschiedene Ausführungsformen von aus mehreren Trockengruppen bestehenden Trockenpartien, die Streichaggregate zur Behandlung der Papier- oder Kartonbahn enthalten.The invention is explained below using the exemplary embodiments shown in the drawings:
Figures 1 to 7 show schematic side views of various embodiments of dryer sections consisting of several dryer groups, which contain coating units for treating the paper or cardboard web.

In den Figuren sind gleiche Bauteile auch mit den gleichen Bezugszeichen versehen worden. Auf diese soll in den einzelnen Figurenbeschreibungen nicht näher eingegangen werden.In the figures, the same components have been given the same reference numerals. These will not be discussed in more detail in the individual figure descriptions.

In der Figur 1 sind drei hintereinander angeordnete doppelreihige Trockengruppen 10, 11, 12, nämlich sogenannte Zwei-Filz-Trockengruppen dargestellt. Sie bestehen jeweils aus den unteren Zylindern 15 mit einem üblichen unteren Filz UF (Filz- oder Trockensiebbespannung) sowie oberen Zylindern 16 mit einem oberen Filz OF. Mit anderen Worten: Fig. 1 zeigt eine erste Trockengruppe 10, eine zweite Trockengruppe 12 und eine dazwischen angeordnete Trockengruppe 11. Diese ZwischenTrockengruppe 11 kann nur einen oder auch mehrere obere Zylinder 16 und wenigstens einen unteren Zylinder 15 (nicht dargestellt) enthalten. Nicht dargestellt sind Antriebe, da sie herkömmlicher Art sind.FIG. 1 shows three double-row dryer groups 10, 11, 12 arranged one behind the other, namely so-called two-felt dryer groups. They each consist of the lower cylinders 15 with a conventional lower felt UF (felt or dryer fabric) and upper cylinders 16 with an upper felt OF. In other words: FIG. 1 shows a first drying group 10, a second drying group 12 and a drying group 11 arranged between them. This intermediate drying group 11 can contain only one or more upper cylinders 16 and at least one lower cylinder 15 (not shown). Drives are not shown since they are of a conventional type.

Nach der ersten Trockengruppe 10, die die Bahn 40 in schräg abwärtslaufender Richtung verläßt, ist ein erstes Streichaggregat 35 zur Behandlung der einen Seite (z. B. der Unterseite) der Bahn 40 angeordnet. Das Streichaggregat 35 für den einseitigen Auftrag eines flüssigen Streichmediums ist hier einem Walzenpaar, bestehend aus zwei miteinander einen Preßspalt bildenden Walzen, zugeordnet. Dabei ist die Walze 1 die Auftragswalze, auf die ein (Düsen-)Auftragswerk 20 wirkt und die Walze 2 ist die Gegenwalze.After the first drying group 10, which leaves the web 40 in an obliquely downward direction, a first coating unit 35 is arranged for treating one side (eg the underside) of the web 40. The coating unit 35 for one-sided application of a liquid coating medium is here assigned to a pair of rollers, consisting of two rollers forming a press nip with one another. The roller 1 is the application roller on which a (nozzle) application unit 20 acts and the roller 2 is the counter roller.

Dem Streichaggregat 35 schließt sich eine von der Bahn 40 umschlungene, in der Höhe der unteren Trockenzylinder 15 der ersten und zweiten Trockenzylindergruppe 10 und 12 befindliche Umlenk-Walze 30 an. Diese kann beheizbar oder unbeheizt sein, rotierend oder auch feststehend ausgeführt sein.The coating unit 35 is followed by a deflection roller 30 wrapped in the web 40 and located at the level of the lower drying cylinders 15 of the first and second drying cylinder groups 10 and 12. This can be heated or unheated, rotating or fixed.

Wird das Streichaggregat 35 in eine bereits vorhandene Trockenpartie nachträglich eingebaut, wird ein vorhandener, unterer heizbarer Trockenzylinder als Umlenkwalze 39 genutzt.If the coating unit 35 is retrofitted into an already existing drying section, an existing, lower, heatable drying cylinder is used as the deflection roller 39.

Wie in Fig. 1 ersichtlich ist, wird die bestrichene Seite der Bahn 40 mittels einer am Umfang der Walze 30 angeordneten kontaktlosen Trocknungseinrichtung 21 soweit getrocknet, daß sie danach zunächst durch Kontakt mit einem weiteren oberen Trockner 16 der Trockengruppe 11 weitergetrocknet werden kann. (Falls erforderlich, kann vor oder nach der Umlenkwalze 30 eine Breitstreckwalze angeordnet werden.)As can be seen in FIG. 1, the coated side of the web 40 is dried by means of a contactless drying device 21 arranged on the circumference of the roller 30 to such an extent that it can then be dried further by contact with a further upper dryer 16 of the drying group 11. (If necessary, an spreader roller can be arranged before or after the deflection roller 30.)

Anschließend läuft die Bahn 40 über Papierleitwalzen 22, von wo aus sie in aufwärtiger Richtung dem nächsten Streichaggregat 35' zur Behandlung der anderen Seite, z. B. der Oberseite der Bahn, zugeführt wird. Die Bahn passiert dabei wieder ein aus Walzen 1 und 2 bestehendes, einen Preßspalt bildendes Walzenpaar. Dieses Streichaggregat 35' umfaßt vorzugsweise ein spezielles Düsenauftragswerk 20' gemäß Patentanmeldung P 44 13 232.8. Eine weitere kontaktlose Trocknungseinrichtung 21 an der Walze 30' ist dem Streichaggregat 35' nachgeordnet.Then the web 40 runs over paper guide rollers 22, from where it is in the upward direction to the next coating unit 35 'for treating the other side, e.g. B. the top of the web is supplied. The web again passes through a pair of rolls consisting of rolls 1 and 2, forming a press nip. This coating unit 35 'preferably comprises a special nozzle applicator 20' according to patent application P 44 13 232.8. Another contactless drying device 21 on the roller 30 'is arranged downstream of the coating unit 35'.

Wie Fig. 2 zeigt, ist es auch möglich, die Umlenkwalzen 30 bzw. 30' ohne kontaktlose Trockner 21 zu benutzen.As FIG. 2 shows, it is also possible to use the deflecting rollers 30 and 30 'without a contactless dryer 21.

In den Figuren 3 und 4 ist der Einsatz von berührungslosen Bahn-Umlenkmitteln anstelle der Umlenkwalzen 30 und 30' dargestellt, wobei Fig. 3 den sogenannten "Air turn" 39' und Fig. 4 den sogenannten "Air can" 39 zeigt. Die Air turns und Air cans sind mit Luftdüsen für beheizte oder unbeheizte Luft versehen, die ein Luftpolster zwecks Bahnumlenkung erzeugen. Ein Air turn wird in der Regel mit Kaltluft beaufschlagt und dient der Bahnumlenkung. Ein Air can, der mit beheizter Luft arbeitet, ist Bahnumlenkeinrichtung und Bahntrockner zugleich.FIGS. 3 and 4 show the use of non-contact web deflecting means instead of deflecting rollers 30 and 30 ', FIG. 3 showing the so-called "air turn" 39' and FIG. 4 the so-called "air can" 39. The air turns and air cans are equipped with air nozzles for heated or unheated air, which create an air cushion for the purpose of deflecting the web. An air turn is usually subjected to cold air and is used to divert the web. An Air can that works with heated air is a web deflection device and a web dryer at the same time.

In üblicher Weise erfolgt danach, wie in den Figuren 1 bis 3 zu sehen, die weitere Trocknung der Bahn 40 in der nächsten oder zweiten Trockengruppe 12, wonach auch weitere Streichaggregate (nicht dargestellt in den Figuren) angeordnet sein können.1 to 3, the web 40 is then further dried in the next or second drying group 12, after which further coating units (not shown in the figures) can also be arranged.

Auch die Umlenkwalze 30' kann genau wie die Walze 30 beheizbar oder unbeheizt sein. In letzterem Falle stellt diese dann eine einfache Bahnleitwalze dar. Die Walze 30' kann ebenfalls wie die Walze 30 rotieren oder feststehen.The deflecting roller 30 ', like the roller 30, can also be heated or unheated. In the latter case, this then represents a simple web guide roller. The roller 30 'can also rotate or be stationary like the roller 30.

In den Figuren 1 bis 4 sind darüber hinaus unter den Streichaggregaten 35 und 35' Bediengänge 23, die mit Geländer und einer Auffangwanne für das Abspritzen des flüssigen Auftragsmediums versehen sind, mit dargestellt.In FIGS. 1 to 4, operating passages 23, which are provided with railings and a collecting trough for spraying off the liquid application medium, are also shown under the coating units 35 and 35 '.

Die Figur 5 zeigt den nachträglichen Einbau von Streichaggregaten 35 und 35' in eine bereits vorhandene doppelreihige Trockenpartie. Die Trockenzylinder und Leitwalzen, die aufgrund des Einbaus der Streichaggregate 35 und 35' ausgebaut werden mußten, wurden in der Zeichnung gestrichelt dargestellt. Der Antrieb muß so umgebaut werden, daß dieser Zylinder entgegen der ursprünglichen Drehrichtung laufen kann und separat drehzahlregelbar ist.FIG. 5 shows the subsequent installation of coating units 35 and 35 'in an already existing double-row dryer section. The drying cylinders and guide rollers, which had to be removed due to the installation of the coating units 35 and 35 ', were shown in dashed lines in the drawing. The drive must be converted so that this cylinder can run counter to the original direction of rotation and can be controlled separately.

Anstelle von ausgebauten Trockenzylindern 15' sind für die einzubauenden Streichaggregate 35 und 35' wieder Auftragswalzen 1 angebracht. Als Gegenwalze dient hierbei je ein vorhandener Trockenzylinder, der in der Figur 5 mit 16'', (bei Streichaggregat 35) und 15'' (bei Streichaggregat 35') bezeichnet wurde. In Fig. 5 ist in strichpunktierter Linie noch der Verlauf der Bahn 40 eingezeichnet - bei Nichtbenutzung des Streichaggregats 35' -, wenn der Weg über die Papierleitwalzen 22 nicht genommen werden soll.Instead of removed drying cylinders 15 ', application rollers 1 are again fitted for the coating units 35 and 35' to be installed. An existing drying cylinder, which was designated in FIG. 5 by 16 ″ (in the case of coating unit 35) and 15 ″ (in the case of coating unit 35 ′), serves as the counter-roller. In FIG. 5, the course of the web 40 is also shown in a dash-dotted line - when the coating unit 35 'is not in use - if the path over the paper guide rollers 22 is not to be taken.

Zwei weitere Varianten der Bahnführung sind in den Figuren 6 und 7 dargestellt. Bei beiden Figuren 6 und 7 ist gezeigt, daß sich das erste Streichaggregat 35 auch an eine einreihige Trockengruppe 13, bestehend aus Trockenzylindern 17 anschließen kann. Am Ende dieser einreihigen Trockengruppe 13 kann die Papierbahn 40 einen Restfeuchtigkeitsgehalt zwischen ca. 2 % und ca. 6 % aufweisen, je nach den vorliegenden Betriebsbedingungen und je nach der Art des nachfolgend aufgetragenenTwo further variants of the web guide are shown in FIGS. 6 and 7. In both Figures 6 and 7 it is shown that the first coating unit 35 can also be connected to a single-row dryer group 13 consisting of drying cylinders 17. At the end of this single-tier dryer group 13, the paper web 40 can have a residual moisture content of between approximately 2% and approximately 6%, depending on the existing operating conditions and the type of subsequently applied

Streichmediums. Die Trockengruppe 13 hat einen endlosen Filz F, der zusammen mit der Bahn 40 abwechselnd über die Trockenzylinder 17 und Umlenkwalzen 18 läuft. Es ist denkbar, daß die Umlenkwalzen 18 auch als Saugwalzen mit externen Saugkasten 19 ausgebildet sein können.Coating medium. The drying group 13 has an endless felt F which, together with the web 40, runs alternately over the drying cylinders 17 and deflection rollers 18. It is conceivable that the deflecting rollers 18 can also be designed as suction rollers with an external suction box 19.

Im Anschluß an das Streichaggregat 35 und die kontaktlosen Trockner 21 durchläuft die Bahn 40 wieder eine einreihige Trockengruppe 14, die ebenfalls wie die Trockengruppe 13 beschaffen ist. Papierleitwalzen 22 transportieren die Bahn 40 danach zum zweiten Streichaggregat 35' und danach zur Walze 30' mit den kontaktlosen Trocknern 21.Following the coating unit 35 and the contactless dryers 21, the web 40 again passes through a single-row dryer group 14, which is also like the dryer group 13. Paper guide rollers 22 then transport the web 40 to the second coating unit 35 ′ and then to the roller 30 ′ with the contactless dryers 21.

Nachfolgend wird die Bahn 40 einer weiteren Trocknung in einer doppelreihigen Trockengruppe 12, wie sie bereits in Figur 1 dargestellt ist, ausgesetzt.Subsequently, the web 40 is subjected to further drying in a double-row dryer group 12, as is already shown in FIG. 1.

Bei der Figur 7 dagegen ist gezeigt, daß der Auftrag des flüssigen Streichmediums auf die andere Seite der Bahn 40 gleich im Anschluß an die kontaktlose Trocknung, welche nach dem ersten Auftrag mit dem Streichaggregat 35 vorgenommen wurde, erfolgen kann. In gleicher Weise wie bei Figur 1, 2 und 3 erfolgt danach die zweite kontaktlose Trocknung und die Kontakttrocknung mit der Trockengruppe 12.In contrast, FIG. 7 shows that the application of the liquid coating medium to the other side of the web 40 can take place immediately after the contactless drying, which was carried out after the first application with the coating unit 35. The second contactless drying and the contact drying with the drying group 12 then take place in the same way as in FIGS. 1, 2 and 3.

Es ist auch denkbar, dabei auf die kontaktlose Trocknung 21 zu verzichten. Das ist insbesondere dann sinnvoll, wenn nur geringe Strichgewichte aufzubringen sind.It is also conceivable to dispense with contactless drying 21. This is particularly useful when only light coat weights need to be applied.

Es versteht sich, daß die in den Figuren 2 bis 4 dargestellten Bahn-Umlenkmittel 30, 30', 40 und 40' ebenfalls bei den in Fig. 6 und 7 dargestellten Varianten jeweils Anwendung finden können.It goes without saying that the web deflecting means 30, 30 ', 40 and 40' shown in FIGS. 2 to 4 can also be used in each case in the variants shown in FIGS. 6 and 7.

Aus allen Figuren ist ersichtlich, daß die Bahn in jedem Bereich nur sehr kurze freie Papierlaufstrecken zurücklegen muß, was neben den bereits beschriebenen Vorteilen noch einen verbesserten Laufwirkungsgrad, insbesondere bei hohen Geschwindigkeiten und niedrigen Bahnfestigkeiten hat. Mit anderen Worten, die Gefahr von Papierabrissen wird beträchtlich verringert.It can be seen from all the figures that the web only has to cover very short free paper runs in each area, which in addition to the advantages already described has an improved running efficiency, in particular at high speeds and low web strengths. In other words, the risk of paper tears is significantly reduced.

Claims (14)

Einrichtung zur wahlweisen Behandlung einer laufenden Bahn, vorzugsweise aus Papier oder Karton, durch Oberflächenbeschichtung oder Imprägnieren, wobei im Falle der Behandlung der Bahn wenigstens ein Streichaggregat einer ein- oder mehrreihigen Trockenpartie einer Papiermaschine derart zugeordnet ist, daß a) in die Trockenpartie je ein Streichaggregat (35, 35') für je eine Seite der Bahn (40) integriert ist, b) das Streichaggregat (35, 35') Streichmedienzuführungen für indirekten Auftrag des Streichmediums auf die Bahn hat, dadurch gekennzeichnet, daß c) wenigstens ein Streichaggregat (35) zur Behandlung der einen Seite der Bahn (40) einer Trockengruppe (10, 13) der Trockenpartie nachgeordnet ist, und d) wenigstens ein weiteres Streichaggregat (35') vor einer weiteren Trockengruppe (12) der Trockenpartie zur Behandlung der anderen Seite der Bahn angeordnet ist, e) den Streichaggregaten (35, 35') Mittel zur Bahnumlenkung (30, 30', 39, 39') nachgeordnet sind. Device for the optional treatment of a running web, preferably of paper or cardboard, by surface coating or impregnation, wherein in the case of treating the web at least one coating unit is assigned to a single or multi-row dryer section of a paper machine in such a way that a) a coating unit (35, 35 ') for each side of the web (40) is integrated in the dryer section, b) the coating unit (35, 35 ') has coating media feeds for indirect application of the coating medium to the web, characterized in that c) at least one coating unit (35) for treating one side of the web (40) is arranged after a drying group (10, 13) of the drying section, and d) at least one further coating unit (35 ') is arranged in front of a further dryer group (12) of the dryer section for treating the other side of the web, e) the coating units (35, 35 ') are arranged downstream of web deflection means (30, 30', 39, 39 '). Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zwischen beiden Streichaggregaten (35, 35') eine ZwischenTrockengruppe (11 oder 14) angeordnet ist.Device according to claim 1, characterized in that an intermediate drying group (11 or 14) is arranged between the two coating units (35, 35 '). Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein, dem Streichaggregat (35, 35') nachgeordneter Trockenzylinder der Trockengruppe (11, 12, 14) als Bahn-Umlenkwalze (30, 30') ausgebildet ist.Device according to claim 1, characterized in that a drying cylinder of the drying group (11, 12, 14) arranged downstream of the coating unit (35, 35 ') is designed as a web deflecting roller (30, 30'). Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß dem als Bahn-Umlenkwalze (30, 30') ausgebildeten Trockenzylinder kontaktlose Trockner (21) zugeordnet sind.Device according to Claim 3, characterized in that contactless dryers (21) are assigned to the drying cylinder designed as a web deflecting roller (30, 30 '). Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß dem Streichaggregat (35, 35') wenigstens eine berührungslos arbeitende Bahn-Umlenkeinrichtung (39, 39') nachgeordnet ist.Device according to claim 1, characterized in that at least one non-contact web deflecting device (39, 39 ') is arranged downstream of the coating unit (35, 35'). Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß mindestens eine Trockenzylindergruppe (10, 11, 12) doppelreihig ausgebildet ist, wobei die Streichaggregate (35, 35') jeweils zwischen den Trockenzylindern (15, 16) der unteren und oberen Reihe angeordnet sind.Device according to claim 1, characterized in that at least one drying cylinder group (10, 11, 12) is double-rowed, the coating units (35, 35 ') each being arranged between the drying cylinders (15, 16) of the lower and upper rows. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß mindestens eine Trockenzylindergruppe (13, 14) einreihig ausgebildet ist, wobei die Streichaggregate (35, 35') jeweils ungefähr in Höhe der Trockenzylinder (17) angeordnet sind.Device according to claim 1, characterized in that at least one drying cylinder group (13, 14) is designed in a single row, the coating units (35, 35 ') each being arranged approximately at the height of the drying cylinders (17). Einrichtung nach Anspruch 1 bis 7, dadurch gekennzeichnet, daß die Streichaggregate (35, 35'), die berührungslos arbeitenden Bahn-Umlenkeinrichtungen (39, 39') sowie die kontaktlosen Trockner (21) nachträglich in bereits vorhandene Trockenpartien einbaubar sind.Device according to claims 1 to 7, characterized in that the coating units (35, 35 '), the non-contact web deflection devices (39, 39') and the contactless dryers (21) can be retrofitted into existing dryer sections. Einrichtung nach Anspruch 8, dadurch gekennzeichnet, daß beim nachträglichen Einbau der Streichaggregate (35, 35') in die Trockenpartie für ein Streichaggregat (35, 35') jeweils ein bereits vorhandener Trockenzylinder (15,16) eine Gegenwalze (15'', 16'') darstellt und eine Auftragswalze (1) angeordnet ist, die mit der Gegenwalze (15'', 16'') einen Preßspalt für die Bahn (40) bildet.Device according to claim 8, characterized in that when the coating units (35, 35 ') are subsequently installed in the drying section for a coating unit (35, 35'), an existing drying cylinder (15, 16) is in each case represents a counter roller (15 '', 16 '') and an application roller (1) is arranged, which forms a press nip for the web (40) with the counter roller (15 '', 16 ''). Einrichtung nach Anspruch 1 bis 9, dadurch gekennzeichnet, daß für einen Betrieb der Trockenpartie ohne gewünschte Behandlung der Bahn die Streichaggregate (35, 35') unbenutzt bleiben können.Device according to claims 1 to 9, characterized in that the coating units (35, 35 ') can remain unused for operating the dryer section without the desired treatment of the web. Einrichtung nach Anspruch 1 bis 9, dadurch gekennzeichnet, daß das Streichaggregat (35') zwischen zwei Trockengruppen (14 und 12 oder 11 und 12) angeordnet ist.Device according to claims 1 to 9, characterized in that the coating unit (35 ') is arranged between two drying groups (14 and 12 or 11 and 12). Einrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Streichaggregat (35') unmittelbar dem als Umlenkwalze (30) ausgebildeten Trockenzylinder nachgeordnet ist.Device according to claim 3 or 4, characterized in that the coating unit (35 ') is arranged directly after the drying cylinder designed as a deflection roller (30). Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß wenigstens eines der Streichaggregate (35, 35') unmittelbar zwischen dem letzten Zylinder (15 oder 16) der Trockengruppe (10 oder 11 oder 12) und der Bahnumlenkung (30 oder 30' oder 39 oder 39') angeordnet ist, wobei der letzte Zylinder (15 oder 16) in Höhe der oberen oder unteren Reihe und die Bahnumlenkung (30 oder 30' oder 39 oder 39') in Höhe der anderen (unteren oder oberen) Reihe der Trockengruppe positioniert ist.Device according to claim 6, characterized in that at least one of the coating units (35, 35 ') directly between the last cylinder (15 or 16) of the drying group (10 or 11 or 12) and the web deflector (30 or 30' or 39 or 39 ') is arranged, the last cylinder (15 or 16) being positioned at the level of the upper or lower row and the web deflector (30 or 30' or 39 or 39 ') at the level of the other (lower or upper) row of the drying group. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß wenigstens eines der Streichaggregate (35, 35') unmittelbar zwischen der einen Bahnumlenkung (30) und der anderen Bahnumlenkung (30') angeordnet ist, wobei die Bahnumlenkung (30) in Höhe einer oberen oder unteren Reihe der Trockengruppe (10 oder 11 oder 12) und die Bahnumlenkung (30') in Höhe der anderen (unteren oder oberen) Reihe der Trockengruppe positioniert ist.Device according to claim 6, characterized in that at least one of the coating units (35, 35 ') is arranged directly between the one web deflector (30) and the other web deflector (30'), the web deflector (30) being at the height of an upper or lower one Row of the dryer group (10 or 11 or 12) and the web deflector (30 ') is positioned at the level of the other (lower or upper) row of the dryer group.
EP95108358A 1994-06-10 1995-06-01 Method for providing the drying section of an existing papermachine with a device for coating or impregnating a moving web Expired - Lifetime EP0695828B1 (en)

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DE4420242A DE4420242A1 (en) 1994-06-10 1994-06-10 Equipment for the alternative treatment of a running web
DE4420242 1994-06-10

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CA2151287A1 (en) 1995-12-11
JPH08120588A (en) 1996-05-14
DE4420242A1 (en) 1995-01-05
ATE224976T1 (en) 2002-10-15
FI110136B (en) 2002-11-29
EP0695828B1 (en) 2002-09-25
KR960001341A (en) 1996-01-25
US6051068A (en) 2000-04-18
FI952822A (en) 1995-12-11
DE59510389D1 (en) 2002-10-31
EP0695828A3 (en) 1996-12-18

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