EP1593440B1 - Doctor blade - Google Patents

Doctor blade Download PDF

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Publication number
EP1593440B1
EP1593440B1 EP05102326A EP05102326A EP1593440B1 EP 1593440 B1 EP1593440 B1 EP 1593440B1 EP 05102326 A EP05102326 A EP 05102326A EP 05102326 A EP05102326 A EP 05102326A EP 1593440 B1 EP1593440 B1 EP 1593440B1
Authority
EP
European Patent Office
Prior art keywords
doctor
additional element
clamping device
hose
flexible tube
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.)
Not-in-force
Application number
EP05102326A
Other languages
German (de)
French (fr)
Other versions
EP1593440A3 (en
EP1593440A2 (en
Inventor
Eckard Wozny
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Filing date
Publication date
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Publication of EP1593440A2 publication Critical patent/EP1593440A2/en
Publication of EP1593440A3 publication Critical patent/EP1593440A3/en
Application granted granted Critical
Publication of EP1593440B1 publication Critical patent/EP1593440B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/044—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for holding the blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/041—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors

Definitions

  • the invention relates to a squeegee device for means for applying liquid to pasty media on a running surface with a pressing against the surface doctor element for dosing and / or equalization of the applied medium and with a squeegee holding the clamping device, a first pressurizable hose for closing and a second pressurizable hose for opening the chuck.
  • a generic doctor device 10 is known. This is for better understanding in FIG. 1 shown. It has a clamping device 11, in which a squeegee element, not shown here, can be clamped between a support strip 12 and a guide strip 13.
  • a first hose 14 is subjected to a pressure, in particular compressed air, whereby the hose 14 expands and the support strip 12 and the guide rail 13 in the clamping area E, in which the squeegee element is to be held, abut each other.
  • a pressure in particular compressed air
  • the clamping device 11 is opened only up to an intermediate position.
  • the second tube 15 with a certain pressure, which is less than the maximum pressure, expanded as far as balls 17 are pressed by means of springs 18 in recesses 19.
  • An edge 19a of the recesses 19 prevents the clamping device 11 for changing the doctor element via the intermediate position can be opened out when the lower pressure is applied.
  • the second tube 15 is subjected to the maximum pressure, so that the balls 17 are pressed over the edge 19 a of the recesses 19 also.
  • the doctor device 10 requires a pressure control for the second tube 15 to open the clamping device 11 to the intermediate position. This requires a certain amount of control.
  • the holes for receiving the springs 18 and the recesses 19 require a certain amount of space.
  • the springs 18 and the balls 17 are mechanically stressed components that can wear out over time, the springs 18 also tend to a pollution affecting their function. In the course of time, in the closed state of the clamping device 11, undesired depressions in the support strip 12 can form due to the punctiform loading of the balls 17.
  • Another squeegee device is eg from the DE 4341341 C1 having at least three provided for opening the clamping device, each substantially identical tubes.
  • the invention has the object to improve the doctor device of the type mentioned in such a way that the disadvantages mentioned are avoided in the future.
  • the invention solves this problem by a doctor device of the type mentioned, which is equipped according to the invention with an additional element for opening the clamping device.
  • This additional element has a lower stroke than the second hose available for opening. This eliminates the known from the prior art springs 18, the balls 17, the spring 18 receiving holes and the recesses 19.
  • the additional element actuated, the stroke as I said, is less than the stroke of the hose.
  • the additional element opens the doctor device only to the intermediate position, in which then the doctor element can be replaced. If the squeegee device must be opened beyond the intermediate position for cleaning purposes, the second hose, which is also referred to as opening hose, is actuated, and the first hose, ie the clamping hose relieved.
  • the doctor device according to the invention the number of wear parts is significantly reduced, whereby the reliability of the doctor device is improved. By eliminating the holes and the recesses, the production and assembly costs are significantly reduced and reduces the space required for the doctor device.
  • the additional element is elastically deformable. Consequently, it can be compressed when closing the chuck, and reset when opening the chuck back to its original shape.
  • the additional element can be realized, if it is also designed as a hose.
  • the additional element and / or the hose can be connected to an existing compressed air supply and acted upon to open the clamping device with compressed air.
  • the chuck can be opened with little design effort, which can be used on existing utilities.
  • the additional element may be only an elongated rubber strip.
  • the rubber strip is naturally elastically deformable. If the clamping hose is vented, this elastic rubber strip causes by its rebound that the clamping, i. the clamping device opens a small defined piece. This small piece opening width is completely sufficient for changing the doctor element. Consequently, the rubber strip is a structurally particularly simple and therefore cost-effective solution. For this alternative, sponge rubber has been well proven.
  • the additional element is arranged in the second tube provided for opening the clamping device.
  • the additional element is then protected by the surrounding hose.
  • the additional element has only a total size of a maximum of 1/3 of the opening tube.
  • the additional element can be retrofitted. Then already existing doctor devices can be equipped with the advantages of the doctor device according to the invention.
  • the invention relates to a coating device operated offline or online (ie within a production machine, ie a paper machine for a fibrous web) according to claim 7.
  • This coating device according to the invention comprises a doctor device according to one of claims 1 to 6 and is for the one-sided or two-sided, direct or indirect coating of a running fibrous web, in particular made of paper or cardboard with a liquid to pasty medium provided.
  • the coating is carried out to refine the fibrous web in order to achieve good printing properties for subsequent printing processes in printing presses.
  • Fig. 2 shows a doctor device 20 with a chuck 21.
  • a doctor element 22 held in the form of a machine-wide coating blade.
  • the clamping device 21 has a support strip 23 and a guide rail 24. Between the guide rail 24 and a retaining strip 25 is acted upon by compressed air first hose 26 for closing the clamping device 21 is arranged. Between the retaining strip 25 and a base body 27 there are a second hose 28 and also formed as a hose additional element 29. The additional element 29 is placed inside the hose 28.
  • the jig 21 holds the squeegee element 22
  • the second tube 28 and the additional element 29 are compressed.
  • the clamping device 21 can be opened.
  • the first tube 26 is pressed together.
  • Fig. 3 the clamping device 21 of the doctor device 20 is opened and the doctor element 22 is already removed, for example, to be exchanged for a doctor element with newly ground tip.
  • the clamping device 21 only has to be opened slightly.
  • the additional element 29 is acted upon by compressed air, whereby the retaining strip 25 and thus the support bar 23 are moved by a relatively small stroke.
  • the second tube 28, which surrounds the additional element 29, need not be pressurized with compressed air to change the doctor element 22.
  • the clamping device 21 For cleaning work of the doctor device 20, it is expedient to open the clamping device 21 further than is necessary for changing the doctor element 22. This possibility is in Fig. 4 shown. Therefore, for cleaning purposes, the hose 28, which has a diameter which is several times greater than the hose-like additional element 29, is pressurized with compressed air. As a result, the retaining strip 25 and the support strip 23 are moved by a large stroke. The additional element 29 does not have to be subjected to compressed air for cleaning work.
  • the additional element 29 does not have to be formed like a tube, but may also be an elongated rubber strip.
  • This elongated rubber strip is elastically deformable and opens to replace the doctor element 22 with its restoring force, the clamping device 21 as soon as the prevailing pressure in the tube 26 is reduced.
  • the additional element 29 may also be arranged alongside the tube 28 running along.
  • the strokes of the additional member 29 and the tube 28 may add up so that the tube 28 may be made smaller to open the doctoring device 20 for cleaning purposes with a large stroke.
  • the doctor device according to the invention is used for devices for applying liquid to pasty media on a running surface O.
  • This surface O is for clarity only FIG. 2
  • the surface O is a transfer element, such as an applicator roll or a circulating belt, the transfer element then the application medium to the moving fibrous web in transmits a so-called nip.
  • the pressing against the surface O squeegee element 22 is used for metering and / or equalization of the applied medium and can be as in the FIG. 2 is shown, be designed as a doctor blade.
  • the squeegee element 22 may also be a rotatable grooved or smooth squeegee rod received in a squeegee bed, which in turn is supported on a blade-like foot (formed somewhat like the squeegee blade of FIG. 2 ) is supported.

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  • Paper (AREA)
  • Coating Apparatus (AREA)

Abstract

In a papermaking process a semi-liquid suspension of fibrous material is spread evenly over a flat moving surface by a scraper blade (22) secured within a clamp. The clamping action is effected by two inflatable hoses (14, 26). The clamp action is supported by a rubber hose (29) whose contraction distance is less than that of the second hose (28). The supplementary hose (29) can also be retro-fitted to existing machinery.

Description

Die Erfindung betrifft eine Rakelvorrichtung für Einrichtungen zum Auftragen von flüssigen bis pastösen Medien auf eine laufende Oberfläche mit einem gegen die Oberfläche drückenden Rakelelement zur Dosierung und/oder Vergleichmäßigung des aufgebrachten Mediums und mit einer das Rakelelement haltenden Einspanneinrichtung, einem ersten mit Druck beaufschlagbaren Schlauch zum Schließen und einem zweiten mit Druck beaufschlagbaren Schlauch zum Öffnen der Einspanneinrichtung.The invention relates to a squeegee device for means for applying liquid to pasty media on a running surface with a pressing against the surface doctor element for dosing and / or equalization of the applied medium and with a squeegee holding the clamping device, a first pressurizable hose for closing and a second pressurizable hose for opening the chuck.

Aus dem Stand der Technik ist eine gattungsgemäße Rakelvorrichtung 10 bekannt. Diese ist zum besseren Verständnis in Figur 1 dargestellt. Sie weist eine Einspanneinrichtung 11 auf, in die ein hier nicht dargestelltes Rakelelement zwischen eine Stützleiste 12 und eine Führungsleiste 13 eingespannt werden kann. Zum Einspannen des nicht gezeigten Rakelelements wird ein erster Schlauch 14 mit einem Druck, insbesondere Druckluft beaufschlagt, wodurch der Schlauch 14 expandiert und die Stützleiste 12 und die Führungsleiste 13 im Einspannbereich E, in dem das Rakelelement gehalten werden soll, aneinanderstoßen. Zum Öffnen der Einspanneinrichtung 11 dient ein zweiter parallel verlaufender und durch eine Halteleiste 16 von einander getrennter Schlauch 15. Wird dieser mit Druck beaufschlagt, expandiert er und der erste Schlauch wird entlastet, d.h. der erste Schlauch 14 wird dabei zusammengedrückt. Zum Wechseln des Rakelelements wird die Einspanneinrichtung 11 nur bis zu einer Zwischenstellung geöffnet. Dazu wird der zweite Schlauch 15 mit einem bestimmten Druck, der geringer ist als der maximale Druck, soweit expandiert bis Kugeln 17 mittels Federn 18 in Ausnehmungen 19 gedrückt werden. Ein Rand 19a der Ausnehmungen 19 verhindert, dass die Einspanneinrichtung 11 zum Wechseln des Rakelelements über die Zwischenstellung hinaus geöffnet werden kann, wenn der geringere Druck anliegt. Zu Reinigungsarbeiten an der Rakelvorrichtung 10, der eine größere Öffnungsweite als beim Rakelwechsel erfordert, wird der zweite Schlauch 15 mit dem maximalen Druck beaufschlagt, sodass die Kugeln 17 über den Rand 19a der Ausnehmungen 19 hinaus gedrückt werden.From the prior art, a generic doctor device 10 is known. This is for better understanding in FIG. 1 shown. It has a clamping device 11, in which a squeegee element, not shown here, can be clamped between a support strip 12 and a guide strip 13. For clamping the squeegee element, not shown, a first hose 14 is subjected to a pressure, in particular compressed air, whereby the hose 14 expands and the support strip 12 and the guide rail 13 in the clamping area E, in which the squeegee element is to be held, abut each other. To open the clamping device 11 is a second parallel and by a retaining strip 16 of separate hose 15. If this is pressurized, it expands and the first tube is relieved, ie, the first tube 14 is compressed. To change the doctor element, the clamping device 11 is opened only up to an intermediate position. For this purpose, the second tube 15 with a certain pressure, which is less than the maximum pressure, expanded as far as balls 17 are pressed by means of springs 18 in recesses 19. An edge 19a of the recesses 19 prevents the clamping device 11 for changing the doctor element via the intermediate position can be opened out when the lower pressure is applied. For cleaning work on the doctor device 10, which requires a larger opening width than the blade change, the second tube 15 is subjected to the maximum pressure, so that the balls 17 are pressed over the edge 19 a of the recesses 19 also.

Nachteilig bei dieser aus dem Stand der Technik bekannten Rakelvorrichtung 10 ist, dass bei ihrer Herstellung Bohrungen zur Aufnahme der Federn 18 vorgesehen und die Ausnehmungen 19 gefertigt werden müssen. Ferner müssen die Federn 18 und die Kugeln 17 montiert werden. Dies erhöht den Fertigungs- und Montageaufwand für die Rakelvorrichtung 10. Die Rakelvorrichtung 10 erfordert eine Drucksteuerung für den zweiten Schlauch 15, um die Einspanneinrichtung 11 bis zur Zwischenstellung zu öffnen. Hierzu ist ein bestimmter Steuerungsaufwand erforderlich. Außerdem erfordern die Bohrungen zur Aufnahme der Federn 18 und die Ausnehmungen 19 einen bestimmten Platzbedarf. Bei den Federn 18 und den Kugeln 17 handelt es sich um mechanisch beanspruchte Bauteile, die im Laufe der Zeit verschleißen können, wobei die Federn 18 auch zu einer ihre Funktion beeinträchtigende Verschmutzung neigen. Im Laufe der Zeit können sich im geschlossenen Zustand der Einspanneinrichtung 11 durch die punktförmige Belastung der Kugeln 17 unerwünschte Vertiefungen in der Stützleiste 12 bilden.A disadvantage of this known from the prior art doctor device 10 that provided in their preparation holes for receiving the springs 18 and the recesses 19 must be made. Furthermore, the springs 18 and the balls 17 must be mounted. This increases the manufacturing and assembly costs for the doctor device 10. The doctor device 10 requires a pressure control for the second tube 15 to open the clamping device 11 to the intermediate position. This requires a certain amount of control. In addition, the holes for receiving the springs 18 and the recesses 19 require a certain amount of space. When the springs 18 and the balls 17 are mechanically stressed components that can wear out over time, the springs 18 also tend to a pollution affecting their function. In the course of time, in the closed state of the clamping device 11, undesired depressions in the support strip 12 can form due to the punctiform loading of the balls 17.

Eine weitere Rakelvorrichtung ist z.B. aus der DE 4341341 C1 bekannt, die mindestens drei zum Öffnen der Einspanneinrichtung vorgesehenen, zueinander im Wesentlichen identischen Schläuche aufweist.Another squeegee device is eg from the DE 4341341 C1 having at least three provided for opening the clamping device, each substantially identical tubes.

Die Erfindung hat die Aufgabe die Rakelvorrichtung der eingangs genannten Art dahingehend zu verbessern, dass die genannten Nachteile zukünftig vermieden werden.The invention has the object to improve the doctor device of the type mentioned in such a way that the disadvantages mentioned are avoided in the future.

Die Erfindung löst die gestellte Aufgabe durch eine Rakelvorrichtung der eingangs genannten Art, die erfindungsgemäß mit einem zusätzlichen Element zum Öffnen der Einspanneinrichtung ausgerüstet ist. Dieses zusätzliche Element weist einen geringeren Hub auf als der zweite zum Öffnen vorhandene Schlauch. Dadurch kann es auf die aus dem Stand der Technik bekannten Federn 18, die Kugeln 17, die die Feder 18 aufnehmenden Bohrungen und die Ausnehmungen 19 verzichtet werden. Zum Wechseln des Rakelelements wird zukünftig das zusätzliche Element betätigt, dessen Hub wie gesagt, geringer ist als der Hub des Schlauchs. Somit öffnet das zusätzliche Element die Rakelvorrichtung nur bis zur Zwischenstellung, in der dann das Rakelelement ausgewechselt werden kann. Wenn die Rakelvorrichtung zu Reinigungszwecken über die Zwischenstellung hinaus geöffnet werden muss, wird der zweite Schlauch, der auch als Öffnungsschlauch bezeichnet wird, betätigt, und der erste Schlauch, d.h. der Klemmschlauch entlastet. Bei Einsatz der erfindungsgemäßen Rakelvorrichtung ist die Anzahl an Verschleißteilen erheblich reduziert, wodurch die Betriebssicherheit der Rakelvorrichtung verbessert wird. Durch den Wegfall der Bohrungen und der Ausnehmungen werden die Fertigungs- und Montagekosten deutlich gesenkt und der Platzbedarf für die Rakelvorrichtung reduziert.The invention solves this problem by a doctor device of the type mentioned, which is equipped according to the invention with an additional element for opening the clamping device. This additional element has a lower stroke than the second hose available for opening. This eliminates the known from the prior art springs 18, the balls 17, the spring 18 receiving holes and the recesses 19. To change the doctor element in the future, the additional element actuated, the stroke as I said, is less than the stroke of the hose. Thus, the additional element opens the doctor device only to the intermediate position, in which then the doctor element can be replaced. If the squeegee device must be opened beyond the intermediate position for cleaning purposes, the second hose, which is also referred to as opening hose, is actuated, and the first hose, ie the clamping hose relieved. When using the doctor device according to the invention, the number of wear parts is significantly reduced, whereby the reliability of the doctor device is improved. By eliminating the holes and the recesses, the production and assembly costs are significantly reduced and reduces the space required for the doctor device.

Erfindungsgemäß ist das zusätzliche Element elastisch verformbar. Folglich kann es beim Schließen der Einspanneinrichtung zusammengedrückt werden, und sich beim Öffnen der Einspanneinrichtung wieder in seine ursprüngliche Form zurückstellen.According to the invention, the additional element is elastically deformable. Consequently, it can be compressed when closing the chuck, and reset when opening the chuck back to its original shape.

Konstruktiv besonders einfach und kostengünstig lässt sich das zusätzliche Element realisieren, wenn es ebenfalls als ein Schlauch ausgebildet ist.Constructively particularly simple and inexpensive, the additional element can be realized, if it is also designed as a hose.

Das zusätzliche Element und/oder der Schlauch können an eine vorhandene Druckluftversorgung angeschlossen und zum Öffnen der Einspanneinrichtung mit Druckluft beaufschlagt werden. Somit lässt sich die Einspanneinrichtung mit geringem konstruktiven Aufwand öffnen, wobei auf schon bestehende Versorgungseinrichtungen zurückgegriffen werden kann.The additional element and / or the hose can be connected to an existing compressed air supply and acted upon to open the clamping device with compressed air. Thus, the chuck can be opened with little design effort, which can be used on existing utilities.

In diesem Zusammenhang ist es denkbar, dass das zusätzliche Element von einer Vorrichtungsseite her und der zweite Schlauch von der anderen Vorrichtungsseite her mit Druckluft beaufschlagt werden. Diese Ausführung bedeutet allerdings einen zusätzlichen apparativen Aufwand. Deshalb ist es zweckmäßiger, wenn das zusätzliche Element und der zweite Schlauch an derselben Vorrichtungsseite, d.h. den Stirnseiten, beispielsweise an der Führerseite einer Maschine zur Herstellung und/oder Veredelung einer Faserstoffbahn, über ein Anschlussstück mit der Druckluftzufuhr verbunden sind. Auf der anderen Vorrichtungsseite (z.B. der Triebseite) sind dann beide Elemente verschlossen.In this connection, it is conceivable that compressed air is applied to the additional element from one side of the device and the second tube from the other side of the device. However, this design means additional equipment. Therefore, it is more convenient if the additional element and the second hose on the same device side, ie the end faces, for example on the leader side of a machine for manufacturing and / or finishing a fibrous web, are connected via a connecting piece with the compressed air supply. On the other side of the device (eg the drive side) then both elements are closed.

In einer weiteren bevorzugten Ausführungsform kann das zusätzliche Element nur ein länglicher Gummistreifen sein. Der Gummistreifen ist naturgemäß elastisch verformbar. Wird der Klemmschlauch entlüftet, bewirkt dieser elastische Gummistreifen durch sein Ausfedern, dass die Klemmung, d.h. die Einspanneinrichtung ein kleines definiertes Stück öffnet. Dieses kleine Stück Öffnungsweite ist zum Wechseln des Rakelelements völlig ausreichend. Folglich stellt der Gummistreifen eine konstruktiv besonders einfache und somit kostengünstige Lösung dar. Für diese Alternative hat sich Moosgummi gut bewährt.In a further preferred embodiment, the additional element may be only an elongated rubber strip. The rubber strip is naturally elastically deformable. If the clamping hose is vented, this elastic rubber strip causes by its rebound that the clamping, i. the clamping device opens a small defined piece. This small piece opening width is completely sufficient for changing the doctor element. Consequently, the rubber strip is a structurally particularly simple and therefore cost-effective solution. For this alternative, sponge rubber has been well proven.

Besonders platzsparend und elegant ist es, wenn das zusätzliche Element in dem zum Öffnen der Einspanneinrichtung vorgesehenen zweiten Schlauch angeordnet ist. Außerdem wird dann das zusätzliche Element durch den ihn umgebenden Schlauch geschützt. Das zusätzliche Element weist dabei nur eine Gesamtgröße von maximal 1/3 des Öffnungsschlauches auf.It is particularly space-saving and elegant when the additional element is arranged in the second tube provided for opening the clamping device. In addition, the additional element is then protected by the surrounding hose. The additional element has only a total size of a maximum of 1/3 of the opening tube.

Es ist jedoch auch möglich, das zusätzliche Element und den zum Öffnen der Einspanneinrichtung vorgesehenen zweiten Schlauch nebeneinander entlanglaufend anzuordnen. Dadurch addieren sich die Hübe des zusätzlichen Elementes und des Öffnungsschlauchs, sodass auch dieser kleiner dimensioniert werden kann.However, it is also possible to arrange the additional element and the second tube provided for opening the clamping device running alongside one another. This adds the strokes of the additional element and the opening tube, so that it can be dimensioned smaller.

Das zusätzliche Element kann nachrüstbar sein. Dann können auch schon bestehende Rakelvorrichtungen mit den Vorteilen der erfindungsgemäßen Rakelvorrichtung ausgestattet werden.The additional element can be retrofitted. Then already existing doctor devices can be equipped with the advantages of the doctor device according to the invention.

Außerdem betrifft die Erfindung eine offline oder online (d.h. innerhalb einer Herstellungsmaschine, d.h. Papiermaschine für eine Faserstoffbahn) betriebene Streicheinrichtung gemäß Anspruch 7. Diese Streicheinrichtung weist erfindungsgemäß eine Rakelvorrichtung nach einem der Ansprüche 1 bis 6 auf und ist für die einseitige oder beidseitige, direkte oder indirekte Beschichtung einer laufenden Faserstoffbahn, insbesondere aus Papier oder Karton mit einem flüssigen bis pastösen Medium vorgesehen. Die Beschichtung wird zur Veredelung der Faserstoffbahn vorgenommen, um gute Bedruckungseigenschaften für spätere Druckverfahren in Druckmaschinen erreichen zu können.Moreover, the invention relates to a coating device operated offline or online (ie within a production machine, ie a paper machine for a fibrous web) according to claim 7. This coating device according to the invention comprises a doctor device according to one of claims 1 to 6 and is for the one-sided or two-sided, direct or indirect coating of a running fibrous web, in particular made of paper or cardboard with a liquid to pasty medium provided. The coating is carried out to refine the fibrous web in order to achieve good printing properties for subsequent printing processes in printing presses.

Nachfolgend wird ein Ausführungsbeispiel anhand der beiliegenden Zeichnungen näher erläutert.Hereinafter, an embodiment will be explained in more detail with reference to the accompanying drawings.

Im Einzelnen zeigen:

Fig. 1
eine aus dem Stand der Technik bekannte Rakelvorrichtung;
Fig. 2
eine erfindungsgemäße Rakelvorrichtung mit einem eingespannten Rakelelement;
Fig. 3
die Rakelvorrichtung aus Fig. 2, die zum Wechseln des Rakelelements geöffnet ist; (Zwischenstellung)
Fig. 4
die Rakelvorrichtung aus Fig. 3, die zur Reinigung geöffnet ist.
In detail show:
Fig. 1
a known from the prior art doctor device;
Fig. 2
a doctor device according to the invention with a clamped doctor element;
Fig. 3
the squeegee device Fig. 2 , which is open to change the doctor element; (Intermediate position)
Fig. 4
the squeegee device Fig. 3 , which is open for cleaning.

Fig. 2 zeigt eine Rakelvorrichtung 20 mit einer Einspanneinrichtung 21. Mit der Einspanneinrichtung 21 wird im dargestellten Beispiel ein Rakelelement 22, in Form einer maschinenbreiten Streichklinge gehalten. Die Einspanneinrichtung 21 weist eine Stützleiste 23 und eine Führungsleiste 24 auf. Zwischen der Führungsleiste 24 und einer Halteleiste 25 ist ein mit Druckluft beaufschlagbarer erster Schlauch 26 zum Schließen der Einspanneinrichtung 21 angeordnet. Zwischen der Halteleiste 25 und einem Grundkörper 27 befinden sich ein zweiter Schlauch 28 und ein ebenfalls als Schlauch ausgebildetes zusätzliches Element 29. Das zusätzliche Element 29 ist im Inneren des Schlauches 28 platziert. Wenn die Einspanneinrichtung 21 das Rakelelement 22 hält, werden der zweite Schlauch 28 und das zusätzliche Element 29 zusammengedrückt. Durch Beaufschlagung des zweiten Schlauchs 28 und des zusätzlichen Elementes 29 mit Druckluft kann die Einspanneinrichtung 21 geöffnet werden. Beim Öffnen der Einspanneinrichtung 21 wird dagegen der erste Schlauch 26 zusammen gedrückt. Fig. 2 shows a doctor device 20 with a chuck 21. With the chuck 21 in the example shown, a doctor element 22, held in the form of a machine-wide coating blade. The clamping device 21 has a support strip 23 and a guide rail 24. Between the guide rail 24 and a retaining strip 25 is acted upon by compressed air first hose 26 for closing the clamping device 21 is arranged. Between the retaining strip 25 and a base body 27 there are a second hose 28 and also formed as a hose additional element 29. The additional element 29 is placed inside the hose 28. When the jig 21 holds the squeegee element 22, the second tube 28 and the additional element 29 are compressed. By applying the second tube 28 and the additional element 29 with compressed air, the clamping device 21 can be opened. When opening the clamping device 21, however, the first tube 26 is pressed together.

In Fig. 3 ist die Einspanneinrichtung 21 der Rakelvorrichtung 20 geöffnet und das Rakelelement 22 ist bereits ausgebaut, um beispielsweise gegen ein Rakelelement mit neu angeschliffener Spitze getauscht zu werden. Hierzu muss die Einspanneinrichtung 21 nur etwas geöffnet werden. Zum Öffnen der Einspanneinrichtung 21 für den Wechsel des Rakelelements 22 wird nur das zusätzliche Element 29 mit Druckluft beaufschlagt, wodurch die Halteleiste 25 und somit die Stützleiste 23 um einen relativ geringen Hub verschoben werden. Dadurch wird die Einspanneinrichtung 21 bzw. die Einspannstelle E weit genug geöffnet, um das Rakelelement 22 wechseln zu können. Der zweite Schlauch 28, der das zusätzliche Element 29 umgibt, muss zum Wechseln des Rakelelements 22 nicht mit Druckluft beaufschlagt werden.In Fig. 3 the clamping device 21 of the doctor device 20 is opened and the doctor element 22 is already removed, for example, to be exchanged for a doctor element with newly ground tip. For this purpose, the clamping device 21 only has to be opened slightly. To open the clamping device 21 for the change of the doctor element 22, only the additional element 29 is acted upon by compressed air, whereby the retaining strip 25 and thus the support bar 23 are moved by a relatively small stroke. As a result, the clamping device 21 or the clamping point E is opened far enough to change the doctor element 22 can. The second tube 28, which surrounds the additional element 29, need not be pressurized with compressed air to change the doctor element 22.

Für Reinigungsarbeiten der Rakelvorrichtung 20 ist es zweckmäßig die Einspanneinrichtung 21 weiter zu öffnen als dies zum Wechseln des Rakelelements 22 erforderlich ist. Diese Möglichkeit ist in Fig. 4 dargestellt. Deshalb wird für Reinigungszwecke der Schlauch 28, der einen mehrfach größeren Durchmesser aufweist als das schlauchartig ausgebildete zusätzliche Element 29, mit Druckluft beaufschlagt. Dadurch werden die Halteleiste 25 und die Stützleiste 23 um einen großen Hub verschoben. Das zusätzliche Element 29 muss für Reinigungsarbeiten nicht mit Druckluft beaufschlagt werden.For cleaning work of the doctor device 20, it is expedient to open the clamping device 21 further than is necessary for changing the doctor element 22. This possibility is in Fig. 4 shown. Therefore, for cleaning purposes, the hose 28, which has a diameter which is several times greater than the hose-like additional element 29, is pressurized with compressed air. As a result, the retaining strip 25 and the support strip 23 are moved by a large stroke. The additional element 29 does not have to be subjected to compressed air for cleaning work.

Das zusätzliche Element 29 muss auch nicht schlauchartig ausgebildet sein, sondern kann auch ein länglicher Gummistreifen sein. Dieser längliche Gummistreifen ist elastisch verformbar und öffnet zum Wechseln des Rakelelements 22 mit seiner Rückstellkraft die Einspanneinrichtung 21, sobald im Schlauch 26 der darin herrschende Druck reduziert wird.The additional element 29 does not have to be formed like a tube, but may also be an elongated rubber strip. This elongated rubber strip is elastically deformable and opens to replace the doctor element 22 with its restoring force, the clamping device 21 as soon as the prevailing pressure in the tube 26 is reduced.

Statt das zusätzliche Element 29 im Schlauch 28 zu platzieren, kann es auch neben dem Schlauch 28 entlanglaufend angeordnet sein. Somit können sich die Hübe des zusätzlichen Elementes 29 und des Schlauchs 28 addieren, sodass der Schlauch 28 kleiner dimensioniert werden kann, um die Rakelvorrichtung 20 zu Reinigungszwecken mit einem großen Hub zu öffnen.Instead of placing the additional element 29 in the tube 28, it may also be arranged alongside the tube 28 running along. Thus, the strokes of the additional member 29 and the tube 28 may add up so that the tube 28 may be made smaller to open the doctoring device 20 for cleaning purposes with a large stroke.

Die erfindungsgemäße Rakelvorrichtung wird für Einrichtungen zum Auftragen von flüssigen bis pastösen Medien auf eine laufende Oberfläche O eingesetzt. Diese Oberfläche O ist aus Übersichtlichkeitsgründen nur Figur 2 dargestellt und stellt bei direktem Auftrag des Auftragsmediums eine laufende Papier-, Karton- oder andere Faserstoffbahn dar. Bei indirektem Auftrag ist die Oberfläche O ein Übertragselement, beispielsweise eine Auftragswalze oder auch ein umlaufendes Band, wobei das Übertragselement dann das Auftragsmedium an die laufende Faserstoffbahn in einem sogenannten Nip überträgt.
Das gegen die Oberfläche O drückende Rakelelement 22 dient der Dosierung und/oder Vergleichmäßigung des aufgebrachten Mediums und kann so wie in der Figur 2 dargestellt ist, als Rakelklinge ausgebildet sein. Das Rakelelement 22 kann aber auch ein drehbarer gerillter oder glatter Rakelstab sein, der in einem Rakelbett aufgenommen ist, welches sich wiederum auf einem klingenartigen Fuß (ausgebildet in etwa wie die Rakelklinge von Figur 2) abstützt.The doctor device according to the invention is used for devices for applying liquid to pasty media on a running surface O. This surface O is for clarity only FIG. 2 For indirect application, the surface O is a transfer element, such as an applicator roll or a circulating belt, the transfer element then the application medium to the moving fibrous web in transmits a so-called nip.
The pressing against the surface O squeegee element 22 is used for metering and / or equalization of the applied medium and can be as in the FIG. 2 is shown, be designed as a doctor blade. However, the squeegee element 22 may also be a rotatable grooved or smooth squeegee rod received in a squeegee bed, which in turn is supported on a blade-like foot (formed somewhat like the squeegee blade of FIG FIG. 2 ) is supported.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Rakelvorrichtungdoctor device
1111
Einspanneinrichtungchuck
1212
Stützleistesupporting strip
1313
Führungsleisteguide rail
1414
erster Schlauchfirst hose
1515
zweiter Schlauchsecond hose
1616
Halteleisteretaining strip
1717
KugelBullet
1818
Federfeather
1919
Ausnehmungrecess
19a19a
Rand der AusnehmungEdge of the recess
2020
Rakelvorrichtungdoctor device
2121
Einspanneinrichtungchuck
2222
Rakelelementdoctor element
2323
Stützleistesupporting strip
2424
Führungsleisteguide rail
2525
Halteleisteretaining strip
2626
erster Schlauchfirst hose
2727
Grundkörperbody
2828
zweiter Schlauchsecond hose
2929
zusätzliches Elementadditional element
Ee
Einspannstelleclamping
OO
Oberflächesurface

Claims (7)

  1. Doctor device for apparatus for applying liquid to pasty media to a moving surface, having a doctor element (22) pressing against the surface for metering and/or equalizing the medium applied, and having a clamping device (11, 21) holding the doctor element (22), a flexible tube (14, 26) that can be pressurized and therefore executes a stroke in order to close the clamping device (11, 21) and a second flexible tube (15, 28) that can be pressurized and likewise executes a stroke to open the clamping device (11, 21), characterized in that an additional element (29) which has a shorter stroke than the second flexible tube (28) is provided to open the clamping device (21), the additional element (29) being elastically deformable.
  2. Doctor device according to Claim 1, characterized in that the additional element (29) is likewise a flexible tube that can be pressurized.
  3. Doctor device according to Claim 1, characterized in that the additional element (29) is an elongated rubber strip, in particular a sponge rubber strip.
  4. Doctor device according to one of Claims 1 to 3, characterized in that the additional element (29) is arranged within the second flexible tube (28) provided for opening the clamping device (21).
  5. Doctor device according to one of Claims 1 to 3, characterized in that the additional element (29) and the second flexible tube (28) provided for opening the clamping device (21) are arranged to run along beside each other.
  6. Doctor device according to one of Claims 1 to 5, characterized in that the additional element (29) can be retrofitted.
  7. Coating device, characterized in that it is provided for single-sided or double-sided direct or indirect coating of a moving paper, board or other fibrous web with a liquid to pasty medium, and has a doctor device (20) according to one of Claims 1 to 6.
EP05102326A 2004-04-17 2005-03-23 Doctor blade Not-in-force EP1593440B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004018770A DE102004018770A1 (en) 2004-04-17 2004-04-17 Scraper blade pneumatic clamp for papermaking assembly incorporates secondary expansion hose
DE102004018770 2004-04-17

Publications (3)

Publication Number Publication Date
EP1593440A2 EP1593440A2 (en) 2005-11-09
EP1593440A3 EP1593440A3 (en) 2010-12-22
EP1593440B1 true EP1593440B1 (en) 2012-05-09

Family

ID=34939051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05102326A Not-in-force EP1593440B1 (en) 2004-04-17 2005-03-23 Doctor blade

Country Status (3)

Country Link
EP (1) EP1593440B1 (en)
AT (1) ATE556787T1 (en)
DE (1) DE102004018770A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004040622A1 (en) † 2004-08-21 2006-02-23 Voith Paper Patent Gmbh doctor device
US20150182982A1 (en) * 2012-06-11 2015-07-02 Btg Ipi, Llc Insert and holder for a metering device
CN103861768B (en) * 2014-03-29 2016-08-17 周午贤 A kind of self adaptation high degree type cage guide device for painting

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8232839U1 (en) * 1982-11-23 1984-06-14 Jagenberg AG, 4000 Düsseldorf DEVICE FOR COATING CONTINUOUS MATERIALS
US4789432A (en) * 1987-06-08 1988-12-06 Thermo Electron Web Systems, Inc. Doctoring apparatus
FI91367C (en) * 1990-12-13 1994-06-27 Valmet Paper Machinery Inc Bending compensated blade beam
DE4334555C2 (en) * 1993-10-11 2003-06-26 Jagenberg Papiertech Gmbh Mount for a squeegee rod
DE4341341C1 (en) * 1993-12-06 1995-03-09 Jagenberg Ag Metering system for devices for coating material webs, in particular paper or board webs

Also Published As

Publication number Publication date
DE102004018770A1 (en) 2005-11-03
ATE556787T1 (en) 2012-05-15
EP1593440A3 (en) 2010-12-22
EP1593440A2 (en) 2005-11-09

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