EP0992626A2 - Metering system for devices for coating webs, particularly paper or board web - Google Patents

Metering system for devices for coating webs, particularly paper or board web Download PDF

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Publication number
EP0992626A2
EP0992626A2 EP99118438A EP99118438A EP0992626A2 EP 0992626 A2 EP0992626 A2 EP 0992626A2 EP 99118438 A EP99118438 A EP 99118438A EP 99118438 A EP99118438 A EP 99118438A EP 0992626 A2 EP0992626 A2 EP 0992626A2
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EP
European Patent Office
Prior art keywords
pressure
pressure hose
bed
doctor
divided
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.)
Withdrawn
Application number
EP99118438A
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German (de)
French (fr)
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EP0992626A3 (en
Inventor
Gerhard Wohlfeil
Volker Fäthke
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Voith Patent GmbH
Original Assignee
Jagenberg Papiertechnik GmbH
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Publication date
Application filed by Jagenberg Papiertechnik GmbH filed Critical Jagenberg Papiertechnik GmbH
Publication of EP0992626A2 publication Critical patent/EP0992626A2/en
Publication of EP0992626A3 publication Critical patent/EP0992626A3/en
Withdrawn legal-status Critical Current

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    • 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
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • 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
    • B05C11/042—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 allowing local positioning, loading or deforming along the blades
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • 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
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod

Definitions

  • the invention relates to a metering system for devices for coating running material webs, especially paper or cardboard webs, according to Preamble of claim 1.
  • DE-A-30 22 955 discloses a metering system with a doctor rod as a doctor element known, which is held by a doctor bed made of rubber-elastic material.
  • the Doctor bed is in a holder connected to the machine frame stored and is on its back facing away from the doctor rod by one Pressure hose supported.
  • the invention has for its object to a generic metering system improve that an even coat weight can be set very sensitively.
  • the invention is on the back of the doctor bed between the pressure hose and the doctor bed an elastic element arranged as a buffer in the edge areas in each case between two pressure chambers to balance the pressure transmission works.
  • the dosing system shown in the figures is part of a device for coating a paper or cardboard web, in which a pre-dosed film of pigment coating ink as Coating material first produced on a roller 1 and then by this is delivered to the paper or cardboard web.
  • a pre-dosed film of pigment coating ink as Coating material first produced on a roller 1 and then by this is delivered to the paper or cardboard web.
  • Such coating devices are described for example in DE-34 17 487-A.
  • the dosing system can also be used for direct dosing on a paper or cardboard web are used, as shown for example in DE-30 22 955. Then the roller 1 in the area shown in Figure 1 with the metering system of the Wrapped around paper or cardboard.
  • the metering system contains as a metering element a doctor rod 2, which in one to the roller 1 partially open doctor bed 3 is rotatably mounted by means of a rotary drive.
  • the diameter of the doctor rod 2 is 8 mm to 50 mm, preferably 10 mm to 25 mm. Their length corresponds to the working width of the coating device, which is up to Can be 10 m.
  • the doctor rod 2 is made of stainless steel and its outer surface is wear-resistant coated, for example chrome-plated or coated with ceramic.
  • the doctor bed 3 holding the doctor rod 2 is made of an elastic, preferably rubber-elastic material with a Shore hardness of approx. 80. In the doctor bed 3 channels 4 open towards the doctor rod 1 are incorporated, into which during operation Water is introduced as a lubricant and cleaning fluid.
  • the doctor bed 3 can be moved back and forth to the roller 1 in a rigid bed holder 5 stored, which is preferably made of aluminum. It points at its roller 1 or paper web side facing an opening from which the end of the doctor bed 3 protrudes with the squeegee rod 2 stored therein.
  • the doctor bed 3 preferably instructs this side two rearward-looking dovetail-like extensions that prevent the penetration of coating material into the holder 5. Against the back of the doctor bed 3 facing away from the doctor rod 2 is pressed across the working width extending pressure hose 6, the pressure of the relative position of the Doctor bed 3 in the holder 5 and thus the contact pressure of the doctor blade 2 against the roller 1 certainly.
  • the pressure hose 6 consists of individual, separate pressure chambers 6.1 - 6.4, which - as can be seen from FIG. 2 - each have their own compressed air supply 7. Each pressure chamber 6.1 - 6.4 can be acted upon separately with compressed air in order to associated area of the doctor rod 2 to set an individual pressure.
  • the elastic element On the back of the doctor bed 3 is between this and the pressure hose 6 arranged elastic element, which is more effective than in the axial direction of the doctor rod 2 Compensating for the pressure transfer from the pressure hose 6 to the doctor bed 3 works.
  • the elastic element therefore also extends over the entire working width, i. e. the length of the doctor bed 3 in the axial direction of the doctor rod 2.
  • the pressure hose 8 preferably consists of a rubber-elastic one Material with a wall thickness of 3 mm or greater.
  • the wall thickness of the in Pressure hose 6 subdivided into pressure chambers is less than that of pressure hose 8.
  • the divided pressure hose 6 consists of a rubber-elastic material hose walls as thin as possible, so that optimal positioning behavior Manufacturing inaccuracies do not affect and no hysteresis effects occur.
  • His Wall thickness is preferably less than 3 mm and its height parallel to the tangent to the roller 1 is 20 mm - 50 mm. It is preferably designed as a flat tube, its width radial to the roller 1 is less than its height.
  • the continuous pressure hose 8 is in the embodiment of Figures 1 and 2 also designed as a flat hose. It is preferably via a parallel to the Doctor bar 2 extending central web 9 with the remaining part of the doctor bed 3 connected.
  • the doctor bed 3, the central web 9 and the continuous are advantageous Pressure hose 8 made from one piece.
  • the pressure hose 6 divided into pressure chambers is attached to the doctor bed 3 supported back from the holder 5.
  • it is arranged in front of the rear inner wall of the holder 5 and presses against the pressure hose 8 from behind in the direction of the roller it can be arranged in front of a side wall in the holder 5. He pushes from one side against the pressure hose 8, as shown in Figure 4.
  • a common holder 5 for the doctor bed 3 and the two tubes 6, 8 available. It is also possible to use the doctor bed 3, the tube 8 and / or the Attach hose 6 each in its own holder, which then together in Direction to the roller 1 are adjustable.
  • the doctor bed 3 is possible in the direction of the roller 1 over the required travel limited friction limited storage in the holder 5.
  • the holder 5 is on one Clamping bar 10 clamped, which is attached to a support beam 11.
  • the support beam 11 is adjustable in the direction of the roller 1 to a preselected gap between adjust the roller 1 or the track lying on it and the doctor rod 2 can.
  • the compressed air connections 7 of the pressure chambers 6.1 - 6.4 are through holes in the holder 5 outwards and via adjustable valves to a not shown Compressed air supply connected to an individual pressure in each chamber 6.1 - 6.4 to be able to adjust.
  • the application system is a nozzle application unit with an application chamber 14, which is completed at its outlet end by the metering system is.
  • the application chamber 14 is of a small size Distance from the roller 1 ending overflow plate 15 limited, so that part of the via the adjustable feed channel 16 supplied coating material on the Inflow side overflows to prevent air and contaminants from entering Prevent application chamber 14.
  • a preselected gap between the doctor rod 2 and the roller 1 is set. Coating material is then applied in excess in the application chamber 14 the roller 1 applied, and the pressure chambers 6.1-6.4 are with compressed air acted on, so that the doctor rod 2 is pressed in the direction of the roller 1.
  • the Doctor rod 2 squeegees the coating material applied in excess to the desired coating weight again.
  • an overpressure between 0.3 and 2.0 bar is set.
  • This Pressure is applied to the doctor bed 3 via the pressure hose 8 acting as a buffer transferred, but no sudden change in the Edge areas between two adjacent pressure chambers 6.1-6.4 occurs, but a Compensation takes place. In particular, a pressure drop in the edge area between avoided two adjacent pressure chambers 6.1-6.4, which leads to an undesirable would increase the coat weight in this area.
  • the stroke weight is like this uniformized, it being possible to either over the entire width of the roller same coat weight or a different one in individual areas Adjust stroke weight.
  • FIGS. 3 and 4 show embodiments of a metering system according to the invention shown, in which the continuous pressure hose 8 on the back 3 with a pressure surface that can be changed under pressure is present.
  • the changeability of the Contact surface is achieved in that the with the flat back of the doctor bed 3rd contacting wall of the continuous pressure hose 8 in cross section is curved.
  • Its hose wall is designed so that at a constant Internal pressure over its length locally different pressures from the pressure chambers of the divided pressure hose 6 a locally different contact surface on the Squeegee bed 3 effect. Because the inner pressure of the hose 8 over the entire working width is constant, an increase in the contact surface leads to an increasing contact force of the doctor bed 3 with the doctor rod 2 mounted therein against the roller 1 in this area.
  • the continuous pressure hose 8 is in one Own bed 17 stored, which can be moved in and against the roller 1 in the holder 5 is arranged.
  • the divided pressure hose 6 is between the rear inner wall the holder 5 and the bed 17 and thus presses the pressure hose from behind 8 against the back of the doctor bed 3.
  • the continuous pressure hose 8 fills the Area between the back of the doctor bed 3 and the rear wall of the Holder 5 out.
  • the divided pressure hose 6 presses from one side - in the example from above - against the pressure hose 8.
  • An increase in pressure in a chamber of the Pressure hose 6 thus causes an increase in the pressure surface of the pressure hose 8 on the doctor bed 3 in this area and thus an increased contact pressure Doctor rod 2 to the roller 1.
  • the pressure hose 6 also acts in the embodiments according to FIGS. 3 and 4 as an effective buffer in the axial direction of the doctor rod 2 compensating for the pressure transmission from the chambers of the pressure hose 6 to the doctor bed.
  • a pressure equalization takes place between two pressure chambers, which both a sudden change in the contact pressure as well as one of the edges of the Pressure chambers caused pressure drop prevented.

Landscapes

  • Coating Apparatus (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Abstract

Between divided pressure tubing sections (6) and rear of the wiper bed, a resilient section (8) intervenes. This is an axial buffer for the wiper rod (2), which equalizes pressure transmission from the compression tube sections (6) onto the wiper bed (3). Preferred features: The resilient section has a variable modulus of elasticity. It is a pressure tube (8) extending continuously over the width of the work which is one-piece with the wiper bed. The wiper bed, continuous tube and divided pressure tube (6) are arranged in a common, transversely-adjustable holder (5). The divided tube, is located in front of the rear inner wall of the holder, hence presses from behind, against the continuous pressure tube. The continuous pressure tube is connected by a central bridge parallel to the wiper rod, to the remainder of the wiper bed. The continuous tube presses against the rear of the bed, with a contact area varying in accordance with applied pressure. Each pressure chamber of the divided tube has a compressed air connection (7), led below through the holder. Wall thickness of the continuous pressure tube exceeds that of the divided pressure tube.

Description

Die Erfindung betrifft ein Dosiersystem für Vorrichtungen zum Beschichten von laufenden Materialbahnen, insbesondere Papier- oder Kartonbahnen, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a metering system for devices for coating running material webs, especially paper or cardboard webs, according to Preamble of claim 1.

Zum Beschichten von Papier- oder Kartonbahnen werden bekannterweise Vorrichtungen eingesetzt, die ein Auftragsystem zum Auftragen von Beschichtungsmaterial im Überschuß und ein nachfolgendes Dosiersystem mit einem Rakelelement aufweisen, das den Überschuß bis auf das gewünschte Strichgewicht wieder abrakelt. Das Auftragen und Dosieren erfolgt entweder direkt auf der Bahn in einem Bereich, in dem diese von einer Walze umgelenkt wird, oder indirekt zunächst auf eine Walze, die anschließend den dosierten Film von Beschichtungsmaterial an die Bahn übergibt.Devices are known for coating paper or cardboard webs used an application system for applying coating material in the Have excess and a subsequent metering system with a doctor element, which scrapes the excess back to the desired coat weight. The Application and dosing take place either directly on the web in an area in which this is deflected by a roller, or indirectly first on a roller that then transfers the metered film of coating material to the web.

Aus der DE-A-30 22 955 ist ein Dosiersystem mit einer Rakelstange als Rakelelement bekannt, die von einem Rakelbett aus gummielastischem Material gehalten wird. Das Rakelbett ist in einem mit dem Maschinengestell in Verbindung stehenden Halter gelagert und wird an seiner der Rakelstange abgewandten Rückseite von einem Druckschlauch abgestützt.DE-A-30 22 955 discloses a metering system with a doctor rod as a doctor element known, which is held by a doctor bed made of rubber-elastic material. The Doctor bed is in a holder connected to the machine frame stored and is on its back facing away from the doctor rod by one Pressure hose supported.

Die DE 43 41 341-C beschreibt ein gattungsgemäßes Dosiersystem, bei dem der Druckschlauch in einzelne Druckkammern unterteilt ist, die jeweils getrennt mit Druckluft beaufschlagbar sind. Bei diesem Dosiersystem ist es möglich, den vom Druckschlauch erzeugten Anpreßdruck über die Arbeitsbreite lokal unterschiedlich einzustellen, um systembedingte Fehler in der Gleichmäßigkeit des Strichgewichts zu korrigieren. So wird der Stellbereich für das Strichgewicht erweitert, da lokale Unregelmäßigkeiten sich bei der Strichgewichtseinstellung nicht mehr über die gesamte Arbeitsbreite auswirken. Weiterhin läßt sich gezielt in einzelnen Bereichen ein unterschiedliches Strichgewicht einstellen, um beispielsweise Dickenschwankungen in einer Papierbahn auszugleichen oder an den Bahnrändern eine geringere Strichdicke einzustellen.DE 43 41 341-C describes a generic metering system in which the Pressure hose is divided into individual pressure chambers, each separated with compressed air are acted upon. With this dosing system it is possible to use the pressure hose generated contact pressure locally different over the working width to Correct system-related errors in the uniformity of the coat weight. So will the adjustment range for the stroke weight expands because local irregularities the stroke weight setting no longer affect the entire working width. Furthermore, a different coat weight can be targeted in individual areas adjust, for example to compensate for fluctuations in thickness in a paper web or set a smaller line thickness at the edges of the web.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Dosiersystem so zu verbessern, dass sich sehr feinfühlig ein gleichmässiges Strichgewicht einstellen läßt.The invention has for its object to a generic metering system improve that an even coat weight can be set very sensitively.

Diese Aufgabe wird mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved with the features of patent claim 1.

Nach der Erfindung ist an der Rückseite des Rakelbetts zwischen dem Druckschlauch und dem Rakelbett ein elastisches Element angeordnet, das als Puffer in den Randbereichen jeweils zwischen zwei Druckkammern ausgleichend auf die Druckübertragung wirkt.According to the invention is on the back of the doctor bed between the pressure hose and the doctor bed an elastic element arranged as a buffer in the edge areas in each case between two pressure chambers to balance the pressure transmission works.

Die Unteransprüche enthalten bevorzugte, da besonders vorteilhafte Ausgestaltungen der Erfindung.The subclaims contain preferred, since particularly advantageous, configurations the invention.

Die Zeichnung dient zur Erläuterung der Erfindung anhand vereinfacht dargestellter Ausführungsbeispiele:

  • Figur 1 zeigt einen Längsschnitt durch ein Dosiersystem nach der Erfindung.
  • Figur 2 zeigt ausschnittsweise einen Querschnitt durch das Dosiersystem nach Figur 1.
  • Die Figuren
    3 und 4 zeigen jeweils eine alternative Ausgestaltung des Dosiersystems.
    • The drawing serves to explain the invention on the basis of simplified exemplary embodiments:
  • Figure 1 shows a longitudinal section through a metering system according to the invention.
  • FIG. 2 shows a section of a cross section through the metering system according to FIG. 1.
  • The figures
    3 and 4 each show an alternative embodiment of the metering system.

    • Das in den Figuren dargestellte Dosiersystem ist Teil einer Vorrichtung zum Beschichten einer Papier- oder Kartonbahn, bei der ein vordosierter Film von Pigmentstreichfarbe als Beschichtungsmaterial zunächst auf einer Walze 1 erzeugt und anschließend von dieser an die Papier- oder Kartonbahn abgegeben wird. Derartige Beschichtungsvorrichtungen sind beispielsweise in der DE-34 17 487-A beschrieben.The dosing system shown in the figures is part of a device for coating a paper or cardboard web, in which a pre-dosed film of pigment coating ink as Coating material first produced on a roller 1 and then by this is delivered to the paper or cardboard web. Such coating devices are described for example in DE-34 17 487-A.

    Ebenso kann das Dosiersystem zum direkten Dosieren auf einer Papier- oder Kartonbahn eingesetzt werden, wie beispielsweise in der DE-30 22 955 dargestellt ist. Dann ist die Walze 1 in dem in Figur 1 dargestellten Bereich mit dem Dosiersystem von der Papier- oder Kartonbahn umschlungen. The dosing system can also be used for direct dosing on a paper or cardboard web are used, as shown for example in DE-30 22 955. Then the roller 1 in the area shown in Figure 1 with the metering system of the Wrapped around paper or cardboard.

    Das Dosiersystem enthält als Dosierelement eine Rakelstange 2, die in einem zur Walze 1 hin teilweise offenen Rakelbett 3 mittels eines Drehantriebs drehbar gelagert ist. Der Durchmesser der Rakelstange 2 beträgt 8 mm bis 50 mm, vorzugsweise 10 mm bis 25 mm. Ihre Länge entspricht der Arbeitsbreite der Beschichtungsvorrichtung, die bis zu 10 m betragen kann. Die Rakelstange 2 ist aus Edelstahl gefertigt und ihre Mantelfläche ist verschleißfest beschichtet, beispielsweise verchromt oder mit Keramik beschichtet. Das die Rakelstange 2 haltende Rakelbett 3 ist aus einem elastischen, vorzugsweise gummielastischen Material mit einer Shore-Härte von ca. 80 gefertigt. In das Rakelbett 3 sind zur Rakelstange 1 hin offene Kanäle 4 eingearbeitet, in die während des Betriebes Wasser als Schmier- und Reinigungsflüssigkeit eingeleitet wird.The metering system contains as a metering element a doctor rod 2, which in one to the roller 1 partially open doctor bed 3 is rotatably mounted by means of a rotary drive. The The diameter of the doctor rod 2 is 8 mm to 50 mm, preferably 10 mm to 25 mm. Their length corresponds to the working width of the coating device, which is up to Can be 10 m. The doctor rod 2 is made of stainless steel and its outer surface is wear-resistant coated, for example chrome-plated or coated with ceramic. The doctor bed 3 holding the doctor rod 2 is made of an elastic, preferably rubber-elastic material with a Shore hardness of approx. 80. In the doctor bed 3 channels 4 open towards the doctor rod 1 are incorporated, into which during operation Water is introduced as a lubricant and cleaning fluid.

    Das Rakelbett 3 ist zur Walze 1 hin und zurück bewegbar in einem starren Betthalter 5 gelagert, der vorzugsweise aus Aluminium gefertigt ist. Er weist an seiner der Walze 1 bzw. Papierbahn zugewandten Seite eine Öffnung auf, aus der das Ende des Rakelbetts 3 mit der darin gelagerten Rakelstange 2 herausragt. Bevorzugt weist das Rakelbett 3 an dieser Seite zwei nach hinten gerichtete schwalbenschwanzähnliche Verbreiterungen auf, die das Eindringen von Beschichtungsmaterial in den Halter 5 verhindern. Gegen die der Rakelstange 2 abgewandte Rückseite des Rakelbetts 3 drückt ein sich quer über die Arbeitsbreite erstreckender Druckschlauch 6, dessen Druck die relative Position des Rakelbetts 3 im Halter 5 und somit den Anpreßdruck der Rakel 2 gegen die Walze 1 bestimmt. Der Druckschlauch 6 besteht aus einzelnen, getrennten Druckkammern 6.1 - 6.4, die - wie aus Figur 2 ersichtlich - jeweils eine eigene Druckluftzufuhr 7 aufweisen. Jede Druckkammer 6.1 - 6.4 ist so getrennt mit Druckluft beaufschlagbar, um in dem zugehörigen Bereich der Rakelstange 2 einen individuellen Druck einstellen zu können.The doctor bed 3 can be moved back and forth to the roller 1 in a rigid bed holder 5 stored, which is preferably made of aluminum. It points at its roller 1 or paper web side facing an opening from which the end of the doctor bed 3 protrudes with the squeegee rod 2 stored therein. The doctor bed 3 preferably instructs this side two rearward-looking dovetail-like extensions that prevent the penetration of coating material into the holder 5. Against the back of the doctor bed 3 facing away from the doctor rod 2 is pressed across the working width extending pressure hose 6, the pressure of the relative position of the Doctor bed 3 in the holder 5 and thus the contact pressure of the doctor blade 2 against the roller 1 certainly. The pressure hose 6 consists of individual, separate pressure chambers 6.1 - 6.4, which - as can be seen from FIG. 2 - each have their own compressed air supply 7. Each pressure chamber 6.1 - 6.4 can be acted upon separately with compressed air in order to associated area of the doctor rod 2 to set an individual pressure.

    An der Rückseite des Rakelbetts 3 ist zwischen diesem und dem Druckschlauch 6 ein elastisches Element angeordnet, das als in Achsrichtung der Rakelstange 2 wirksamer Puffer ausgleichend auf die Druckübertragung vom Druckschlauch 6 auf das Rakelbett 3 wirkt. Das elastische Element erstreckt sich daher ebenfalls über die gesamte Arbeitsbreite, i. e. die Länge des Rakelbetts 3 in Achsrichtung der Rakelstange 2.On the back of the doctor bed 3 is between this and the pressure hose 6 arranged elastic element, which is more effective than in the axial direction of the doctor rod 2 Compensating for the pressure transfer from the pressure hose 6 to the doctor bed 3 works. The elastic element therefore also extends over the entire working width, i. e. the length of the doctor bed 3 in the axial direction of the doctor rod 2.

    Bevorzugt wird als elastisches Element - wie in Figur 1, Figur 3 und Figur 4 dargestellt - ein durchgehender Druckschlauch 8 verwendet, der an eine eigene Druckluftzufuhr angeschlossen ist, um sein Elastizitätsmodul und somit sein Pufferverhalten verändern zu können. Über den Druck im Druckschlauch 8 läßt sich sowohl die Druckverteilung in Achsrichtung der Rakelstange 2 im Rakelbett 3 als auch die Steifigkeit des Gesamtsystems Rakelstange 2 - Rakelbett 3 - Druckschlauch 8 beeinflussen, um die gewünschte Wirkung auf die Rakelstange 2 zu erzielen. Insbesondere kann Einfluß auf die Feinfühligkeit der Regelung des Strichgewichts genommen werden.Is preferred as an elastic element - as shown in Figure 1, Figure 3 and Figure 4 - a continuous pressure hose 8 is used, which has its own compressed air supply is connected to change its modulus of elasticity and thus its buffer behavior to be able to. About the pressure in the pressure hose 8, both the pressure distribution in Axial direction of the doctor rod 2 in the doctor bed 3 as well as the rigidity of the overall system Doctor rod 2 - doctor bed 3 - pressure hose 8 to influence the desired To achieve effect on the doctor rod 2. In particular, can influence the Sensitivity of the regulation of the coating weight can be taken.

    Damit der durchgehende Druckschlauch 8 einen lokal unterschiedlichen Druck auf die Rückseite des Rakelbetts 3 übertragen kann, weist er eine Wandstärke auf, die ausreichend dick ist. Bevorzugt besteht der Druckschlauch 8 aus einem gummielastischen Material mit einer Wandstärke von größer/gleich 3 mm. Die Wandstärke des in Druckkammern unterteilten Druckschlauchs 6 ist geringer als die des Druckschlauchs 8. Der unterteilte Druckschlauch 6 besteht aus einem gummielastischen Material mit möglichst dünnen Schlauchwänden, damit sich für ein optimales Stellverhalten Fertigungsungenauigkeiten nicht auswirken und keine Hystereseeffekte auftreten. Seine Wanddicke beträgt bevorzugt weniger als 3 mm und seine Höhe parallel zur Tangente an die Walze 1 beträgt 20 mm - 50 mm. Bevorzugt ist er als Flachschlauch ausgebildet, seine Breite radial zur Walze 1 ist geringer als seine Höhe.So that the continuous pressure hose 8 a locally different pressure on the Back of the doctor bed 3 can transmit, it has a wall thickness that is sufficiently thick. The pressure hose 8 preferably consists of a rubber-elastic one Material with a wall thickness of 3 mm or greater. The wall thickness of the in Pressure hose 6 subdivided into pressure chambers is less than that of pressure hose 8. The divided pressure hose 6 consists of a rubber-elastic material hose walls as thin as possible, so that optimal positioning behavior Manufacturing inaccuracies do not affect and no hysteresis effects occur. His Wall thickness is preferably less than 3 mm and its height parallel to the tangent to the roller 1 is 20 mm - 50 mm. It is preferably designed as a flat tube, its width radial to the roller 1 is less than its height.

    Der durchgehende Druckschlauch 8 ist bei der Ausführungsform nach den Figuren 1 und 2 ebenfalls als Flachschlauch ausgebildet. Bevorzugt ist er über einen parallel zur Rakelstange 2 verlaufenden mittigen Steg 9 mit dem übrigen Teil des Rakelbetts 3 verbunden. Vorteilhaft sind das Rakelbett 3, der mittige Steg 9 und der durchgehende Druckschlauch 8 aus einem Stück gefertigt.The continuous pressure hose 8 is in the embodiment of Figures 1 and 2 also designed as a flat hose. It is preferably via a parallel to the Doctor bar 2 extending central web 9 with the remaining part of the doctor bed 3 connected. The doctor bed 3, the central web 9 and the continuous are advantageous Pressure hose 8 made from one piece.

    Der in Druckkammern unterteilte Druckschlauch 6 wird an seiner dem Rakelbett 3 abgewandten Rückseite von dem Halter 5 abgestützt. Bei den Ausfführungsformen nach den Figuren 1 bis 3 ist er vor der rückwärtigen Innenwand des Halters 5 angeordnet und drückt so von hinten in Richtung zur Walze gegen den Druckschlauch 8. Alternativ kann er vor einer Seitenwand im Halter 5 angeordnet werden. Er drückt so von einer Seite gegen den Druckschlauch 8, wie in Figur 4 dargestellt ist. In den vorliegenden Beispielen ist vorteilhaft ein gemeinsamer Halter 5 für das Rakelbett 3 und die beiden Schläuche 6, 8 vorhanden. Ebenso ist es möglich, das Rakelbett 3, den Schlauch 8 und/oder den Schlauch 6 jeweils in einem eigenen Halter zu befestigen, die dann gemeinsam in Richtung zur Walze 1 verstellbar gelagert sind.The pressure hose 6 divided into pressure chambers is attached to the doctor bed 3 supported back from the holder 5. In the embodiments according to Figures 1 to 3, it is arranged in front of the rear inner wall of the holder 5 and presses against the pressure hose 8 from behind in the direction of the roller it can be arranged in front of a side wall in the holder 5. He pushes from one side against the pressure hose 8, as shown in Figure 4. In the present examples is advantageous a common holder 5 for the doctor bed 3 and the two tubes 6, 8 available. It is also possible to use the doctor bed 3, the tube 8 and / or the Attach hose 6 each in its own holder, which then together in Direction to the roller 1 are adjustable.

    Das Rakelbett 3 ist in Richtung zur Walze 1 über den erforderlichen Stellweg möglichst reibungsarm begrenzt beweglich in dem Halter 5 gelagert. Der Halter 5 ist an einem Klemmbalken 10 festgeklemmt, der an einem Tragbalken 11 befestigt ist. Der Tragbalken 11 ist in Richtung zur Walze 1 verstellbar, um einen vorgewählten Spalt zwischen der Walze 1 oder der auf ihr aufliegenden Bahn und der Rakelstange 2 einstellen zu können. Die Druckluftanschlüsse 7 der Druckkammern 6.1 - 6.4 sind durch Bohrungen in dem Halter 5 nach außen geführt und über regelbare Ventile an eine nicht dargestellte Druckluftzufuhr angeschlossen, um in jeder Kammer 6.1 - 6.4 einen individuellen Druck einstellen zu können.The doctor bed 3 is possible in the direction of the roller 1 over the required travel limited friction limited storage in the holder 5. The holder 5 is on one Clamping bar 10 clamped, which is attached to a support beam 11. The support beam 11 is adjustable in the direction of the roller 1 to a preselected gap between adjust the roller 1 or the track lying on it and the doctor rod 2 can. The compressed air connections 7 of the pressure chambers 6.1 - 6.4 are through holes in the holder 5 outwards and via adjustable valves to a not shown Compressed air supply connected to an individual pressure in each chamber 6.1 - 6.4 to be able to adjust.

    In Drehrichtung der Walze 1 (Pfeil 12) vor dem Dosiersystem ist ein bekanntes Auftragsystem 13 (beispielsweise ein Düsen- oder Walzenauftragwerk) angeordnet. Im vorliegenden Beispiel ist das Auftragsystem ein Düsenauftragwerk mit einer Auftragkammer 14, die an ihrem auslaufseitigen Ende von dem Dosiersystem abgeschlossen ist. An ihrem einlaufseitigen Ende ist die Auftragkammer 14 von einer mit geringem Abstand von der Walze 1 endenden Überlaufplatte 15 begrenzt, so dass ein Teil des über den einstellbaren Zufuhrkanal 16 zugeführten Beschichtungsmaterials an der Einlaufseite überfließt, um das Eindringen von Luft und Verunreinigungen in die Auftragkammer 14 zu verhindern.In the direction of rotation of the roller 1 (arrow 12) before the metering system is a known one Application system 13 (for example, a nozzle or roller applicator) arranged. in the In the present example, the application system is a nozzle application unit with an application chamber 14, which is completed at its outlet end by the metering system is. At its inlet end, the application chamber 14 is of a small size Distance from the roller 1 ending overflow plate 15 limited, so that part of the via the adjustable feed channel 16 supplied coating material on the Inflow side overflows to prevent air and contaminants from entering Prevent application chamber 14.

    Vor Beginn des Beschichtungsvorgangs wird zunächst durch Verstellung des Tragbalkens 11 ein vorgewählter Spalt zwischen der Rakelstange 2 und der Walze 1 eingestellt. Anschließend wird Beschichtungsmaterial in der Auftragkammer 14 im Überschuß auf die Walze 1 aufgetragen, und die Druckkammern 6.1-6.4 werden mit Druckluft beaufschlagt, so dass die Rakelstange 2 in Richtung zur Walze 1 gedrückt wird. Die Rakelstange 2 rakelt das im Überschuß aufgetragene Beschichtungsmaterial bis auf das gewünschte Strichgewicht wieder ab. In Abhängigkeit von dem Strichgewicht in den einzelnen Walzenbereichen wird in den zugehörigen Schlauchabschnitten (Druckkammern 6.1-6.4) ein Überdruck zwischen 0,3 und 2,0 bar eingestellt. Dieser Druck wird über den als Puffer wirkenden Druckschlauch 8 auf das Rakelbett 3 übertragen, wobei durch die Pufferwirkung keine sprunghafte Änderung in den Randbereichen zwischen zwei benachbarten Druckkammern 6.1-6.4 auftritt, sondern ein Ausgleich stattfindet. Insbesondere wird so ein Druckabfall im Randbereich zwischen zwei benachbarten Druckkammern 6.1-6.4 vermieden, der zu einem unerwünschten Anstieg des Strichgewichts in diesem Bereich führen würde. Das Strichgewicht wird so vergleichmäßigt, wobei es möglich ist, entweder über die gesamte Walzenbreite ein gleich hohes Strichgewicht oder in einzelnen Bereichen gezielt ein unterschiedliches Strichgewicht einzustellen.Before starting the coating process, first adjust the support beam 11 a preselected gap between the doctor rod 2 and the roller 1 is set. Coating material is then applied in excess in the application chamber 14 the roller 1 applied, and the pressure chambers 6.1-6.4 are with compressed air acted on, so that the doctor rod 2 is pressed in the direction of the roller 1. The Doctor rod 2 squeegees the coating material applied in excess to the desired coating weight again. Depending on the coat weight in the individual roller areas is in the associated hose sections (Pressure chambers 6.1-6.4) an overpressure between 0.3 and 2.0 bar is set. This Pressure is applied to the doctor bed 3 via the pressure hose 8 acting as a buffer transferred, but no sudden change in the Edge areas between two adjacent pressure chambers 6.1-6.4 occurs, but a Compensation takes place. In particular, a pressure drop in the edge area between avoided two adjacent pressure chambers 6.1-6.4, which leads to an undesirable Would increase the coat weight in this area. The stroke weight is like this uniformized, it being possible to either over the entire width of the roller same coat weight or a different one in individual areas Adjust stroke weight.

    In den Figuren 3 und 4 sind Ausführungsformen eines erfindungsgemäßen Dosiersystems dargestellt, bei denen der durchgehende Druckschlauch 8 an der Rückseite 3 mit einer unter Druck veränderbaren Anpreßfläche anliegt. Die Veränderbarkeit der Anpreßfläche wird dadurch erreicht, dass die mit der ebenen Rückseite des Rakelbetts 3 in Kontakt stehende Wand des durchgehenden Druckschlauchs 8 im Querschnitt gekrümmt verläuft. Seine Schlauchwand ist so gestaltet, dass bei einem konstanten Innendruck über seine Länge lokal unterschiedliche Drücke von den Druckkammern des unterteilten Druckschlauchs 6 eine lokal unterschiedliche Anpreßfläche an dem Rakelbett 3 bewirken. Da der Innendruck des Schlauchs 8 über die gesamte Arbeitsbreite konstant ist, führt eine Vergrößerung der Anpreßfläche zu einer steigenden Anpreßkraft des Rakelbetts 3 mit der darin gelagerten Rakelstange 2 gegen die Walze 1 in diesem Bereich.FIGS. 3 and 4 show embodiments of a metering system according to the invention shown, in which the continuous pressure hose 8 on the back 3 with a pressure surface that can be changed under pressure is present. The changeability of the Contact surface is achieved in that the with the flat back of the doctor bed 3rd contacting wall of the continuous pressure hose 8 in cross section is curved. Its hose wall is designed so that at a constant Internal pressure over its length locally different pressures from the pressure chambers of the divided pressure hose 6 a locally different contact surface on the Squeegee bed 3 effect. Because the inner pressure of the hose 8 over the entire working width is constant, an increase in the contact surface leads to an increasing contact force of the doctor bed 3 with the doctor rod 2 mounted therein against the roller 1 in this area.

    Bei der Ausführungsform nach Figur 3 ist der durchgehende Druckschlauch 8 in einem eigenen Bett 17 gelagert, das in und gegen die Walze 1 verschiebbar im Halter 5 angeordnet ist. Der unterteilte Druckschlauch 6 ist zwischen der rückwärtigen Innenwand des Halters 5 und dem Bett 17 angeordnet und drückt so von hinten den Druckschlauch 8 gegen die Rückseite des Rakelbetts 3.In the embodiment according to FIG. 3, the continuous pressure hose 8 is in one Own bed 17 stored, which can be moved in and against the roller 1 in the holder 5 is arranged. The divided pressure hose 6 is between the rear inner wall the holder 5 and the bed 17 and thus presses the pressure hose from behind 8 against the back of the doctor bed 3.

    Bei der Ausführungsform nach Figur 4 füllt der durchgehende Druckachlauch 8 den Bereich zwischen der Rückseite des Rakelbetts 3 und der rückwärtigen Wand des Halters 5 aus. Der unterteilte Druckschlauch 6 drückt von einer Seite - im Beispiel von oben - gegen den Druckschlauch 8. Eine Erhöhung des Drucks in einer Kammer des Druckschlauchs 6 bewirkt so eine Vergrößerung der Anpreßfläche des Druckschlauchs 8 an dem Rakelbett 3 in diesem Bereich und somit eine erhöhte Anpreßkraft der Rakelstange 2 an die Walze 1.In the embodiment according to FIG. 4, the continuous pressure hose 8 fills the Area between the back of the doctor bed 3 and the rear wall of the Holder 5 out. The divided pressure hose 6 presses from one side - in the example from above - against the pressure hose 8. An increase in pressure in a chamber of the Pressure hose 6 thus causes an increase in the pressure surface of the pressure hose 8 on the doctor bed 3 in this area and thus an increased contact pressure Doctor rod 2 to the roller 1.

    Auch bei den Ausführungsformen nach den Figuren 3 und 4 wirkt der Druckschlauch 6 als in Achsrichtung der Rakelstange 2 wirksamer Puffer ausgleichend auf die Druckübertragung von den Kammern des Druckschlauchs 6 auf das Rakelbett. In den Randbereichen jeweils zwischen zwei Druckkammern findet ein Druckausgleich statt, der sowohl eine sprunghafte Änderung des Anpreßdrucks als auch einen von den Rändern der Druckkammern verursachten Druckabfall verhindert.The pressure hose 6 also acts in the embodiments according to FIGS. 3 and 4 as an effective buffer in the axial direction of the doctor rod 2 compensating for the pressure transmission from the chambers of the pressure hose 6 to the doctor bed. In the marginal areas A pressure equalization takes place between two pressure chambers, which both a sudden change in the contact pressure as well as one of the edges of the Pressure chambers caused pressure drop prevented.

    Claims (10)

    Dosiersystem für Vorrichtungen zum Beschichten von Materialbahnen, insbesondere Papier- oder Kartonbahnen, mit einer Rakelstange (2) als Dosierelement, die von einem Rakelbett (3) aus elastischem, bevorzugt gummielastischem, Material gehalten wird, das in einem Halter (5) gelagert ist und gegen dessen der Rakelstange (2) abgewandte Rückseite ein Druckschlauch (6) drückt, der sich über die Arbeitsbreite erstreckt und
    quer über die Arbeitsbreite in einzelne Druckkammern (6.1 - 6.4) unterteilt ist, die jeweils getrennt mit Druckluft beaufschlagbar sind,
    dadurch gekennzeichnet, dass zwischen dem Druckschlauch (6) und der Rückseite des Rakelbetts (3) ein elastisches Element angeordnet ist, das als in Achsrichtung der Rakelstange (2) wirksamer Puffer ausgleichend auf die Druckübertragung vom Druckschlauch (6) auf das Rakelbett (3) wirkt.         Dosing system for devices for coating material webs, in particular paper or cardboard webs, with a doctor rod (2) as a metering element, which is held by a doctor bed (3) made of elastic, preferably rubber-elastic, material, which is mounted in a holder (5) and against which the doctor rod (2) facing away from the back presses a pressure hose (6) extends across the working width and
    is divided across the working width into individual pressure chambers (6.1 - 6.4), each of which can be pressurized separately with compressed air,
    characterized in that an elastic element is arranged between the pressure hose (6) and the back of the doctor bed (3), which acts as a buffer acting in the axial direction of the doctor rod (2) to compensate for the pressure transmission from the pressure hose (6) to the doctor bed (3) works.     Dosiersystem nach Anspruch 1, dadurch gekennzeichnet, dass das Elastizitätsmodul des elastischen Elements veränderbar ist.Dosing system according to claim 1, characterized in that the modulus of elasticity of the elastic element is changeable. Dosiersystem nach Anspruch 2, dadurch gekennzeichnet, dass das elastische Element ein sich quer über die Arbeitsbreite erstreckender durchgehender Druckschlauch (8) ist.Dosing system according to claim 2, characterized in that the elastic element is a continuous pressure hose (8) extending across the working width. Dosiersystem nach Anspruch 3, dadurch gekennzeichnet, dass der durchgehende Druckschlauch (8) mit dem Rakelbett (3) aus einem Stück gefertigt ist. Dosing system according to claim 3, characterized in that the continuous pressure hose (8) with the doctor bed (3) is made in one piece. Dosiersystem nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass das Rakelbett (3), der durchgehende Druckschlauch (8) und der unterteilte Druckschlauch (6) in einem gemeinsamen, querverstellbaren Halter (5) angeordnet sind.Dosing system according to claim 3 or 4, characterized in that the doctor bed (3), the continuous pressure hose (8) and the divided pressure hose (6) are arranged in a common, cross-adjustable holder (5). Dosiersystem nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass der in Druckkammern (6.1-6.4) unterteilte Druckschlauch (6) vor der rückwärtigen Innenwand des Halters (5) angeordnet ist und so von hinten gegen den durchgehenden Druckschlauch (8) drückt.Dosing system according to one of claims 3 to 5, characterized in that the pressure hose (6) divided into pressure chambers (6.1-6.4) is arranged in front of the rear inner wall of the holder (5) and thus presses against the continuous pressure hose (8) from behind. Dosiersystem nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass der durchgehende Druckschlauch (8) über einen parallel zur Rakelstange (2) verlaufenden mittigen Steg (9) mit dem übrigen Teil des Rollrakelbetts (3) verbunden ist.Dosing system according to one of claims 3 to 6, characterized in that the continuous pressure hose (8) is connected to the remaining part of the roll doctor bed (3) via a central web (9) running parallel to the doctor rod (2). Dosiersystem nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass der durchgehende Druckschlauch (8) an der Rückseite des Rakelbetts (3) mit einer unter Druck veränderbaren Anpreßfläche anliegt.Dosing system according to one of claims 3 to 6, characterized in that the continuous pressure hose (8) rests on the back of the doctor bed (3) with a pressure surface which can be changed under pressure. Dosiersystem nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass jede Druckkammer (6.1-6.4) des unterteilten Schlauches (6) einen Druckluftanschluß (7) aufweist, der durch den Halter (5) nach außen geführt ist.Dosing system according to one of claims 1 to 8, characterized in that each pressure chamber (6.1-6.4) of the divided hose (6) has a compressed air connection (7) which is guided through the holder (5) to the outside. Dosiersystem nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, dass die Wandstärke des durchgehenden Druckschlauchs (8) größer ist als die Wandstärke des unterteilten Druckschlauchs (6).Dosing system according to one of claims 3 to 9, characterized in that the wall thickness of the continuous pressure hose (8) is greater than the wall thickness of the divided pressure hose (6).
    EP99118438A 1998-10-09 1999-09-17 Metering system for devices for coating webs, particularly paper or board web Withdrawn EP0992626A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19846708A DE19846708A1 (en) 1998-10-09 1998-10-09 Dosing system for devices for coating material webs, in particular paper or cardboard webs
    DE19846708 1998-10-09

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    EP0992626A2 true EP0992626A2 (en) 2000-04-12
    EP0992626A3 EP0992626A3 (en) 2001-08-01

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    RU2507012C1 (en) * 2010-08-04 2014-02-20 Рико Компани, Лтд. Method of coat application by roller blade and device to this end

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    EP0992626A3 (en) 2001-08-01
    US6379462B1 (en) 2002-04-30
    DE19846708A1 (en) 2000-04-13

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