WO1995016074A1 - Metering system for devices for coating materials webs, especially paper or cardboard webs - Google Patents

Metering system for devices for coating materials webs, especially paper or cardboard webs Download PDF

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Publication number
WO1995016074A1
WO1995016074A1 PCT/EP1994/003885 EP9403885W WO9516074A1 WO 1995016074 A1 WO1995016074 A1 WO 1995016074A1 EP 9403885 W EP9403885 W EP 9403885W WO 9516074 A1 WO9516074 A1 WO 9516074A1
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WO
WIPO (PCT)
Prior art keywords
webs
doctor
roller
hose
pressure
Prior art date
Application number
PCT/EP1994/003885
Other languages
German (de)
French (fr)
Inventor
Reinhard Knop
Original Assignee
Jagenberg Papiertechnik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6504169&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1995016074(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Jagenberg Papiertechnik Gmbh filed Critical Jagenberg Papiertechnik Gmbh
Priority to DE59407565T priority Critical patent/DE59407565D1/en
Priority to JP7515920A priority patent/JPH08506525A/en
Priority to EP95903275A priority patent/EP0682728B1/en
Publication of WO1995016074A1 publication Critical patent/WO1995016074A1/en
Priority to FI953719A priority patent/FI100814B/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/202—Rotors with adjustable area of intercepted fluid
    • F05B2240/2022—Rotors with adjustable area of intercepted fluid by means of teetering or coning blades

Definitions

  • Dosiers ⁇ stem for devices for coating material webs in particular paper or cardboard webs
  • the invention relates to a metering system for devices for coating running material webs, in particular paper or cardboard webs, according to the preamble of patent claim 1.
  • devices for coating paper or cardboard webs which have an application system for applying coating material in excess and a subsequent metering system with a doctor element which doctor the excess down to the desired coat weight.
  • the application and dosing is either carried out directly on the web in an area in which it is deflected by a roller, or indirectly initially also on the
  • Web deflecting roller which then transfers the metered film of coating material to the web.
  • a generic metering system with a doctor rod is known, which is obtained from a doctor bed made of rubber-elastic material.
  • the doctor bed is mounted in a holder which is connected to the machine frame and is supported on its rear side facing away from the doctor rod by a pressure hose. With this system the thickness of the metered film can be measured
  • the relatively small adjustment range is caused by irregularities in the web and / or
  • the object of the invention is to expand the adjustment range for the coat weight in a metering system of the generic type, in particular to be able to achieve higher coat weights with a uniform application.
  • the contact pressure generated by the pressure hose it is possible to set the contact pressure generated by the pressure hose locally differently over the working width in order to compensate for system-related errors in order to equalize the coat weight.
  • This extends the adjustment range for the stroke weight, since local irregularities no longer affect the entire working width when adjusting the stroke weight.
  • Another advantage is that a different stroke weight can be set in individual areas, e.g. B. to compensate for fluctuations in thickness in a paper web or to achieve a smaller line thickness at the edges of the web.
  • Figure 1 shows a longitudinal section through a metering system according to the invention
  • Figure 2 shows a section of a cross section.
  • the metering system shown in Figure 1 is part of a device for coating a paper or cardboard web, in which a pre-metered film of coating material is first produced on a roller 1 and then released from the latter in a press nip between the roller 1 and a further press roller to the web becomes.
  • Roll 1 is therefore partially wrapped in the area not shown in Figure 1 by the web.
  • Such coating devices are e.g. B. described in DE-A-34 17 487.
  • the dosing system can also be used for direct dosing on a paper web, such as. B. shown in DE-A-30 22 955. Then the roller 1 is wrapped in the area shown in Figure 1 with the metering system of the paper or cardboard web.
  • the metering system contains as a metering element a doctor rod 2 which is rotatably mounted in a doctor bed 3 which is partially open towards the roller 1 by means of a rotary drive.
  • the diameter of the doctor rod 2 is 8 to 50 mm, preferably 10 mm to 25 mm, its length corresponds to the working width of the coating device, which can be up to 10 m. It is made of stainless steel and its outer surface is coated so that it is wear-resistant, e.g. B. chrome 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 approximately 80, in the present exemplary embodiment made of rubber.
  • open channels 4 are incorporated into the doctor rod 1, into which water is introduced as a lubricant and cleaning agent during operation.
  • the doctor bed 3 is mounted in a bed holder 5 which is open towards the roller 1 and has two dovetail-like widenings on its side facing the roller 1 in order to prevent the penetration of coating material into the holder 5.
  • the squeegee bed 3 is supported in the holder 5 by a pressure hose 6, which extends across the working width and presses in the direction of the roller 1 and which is arranged in an adapted recess in the holder 5.
  • the pressure hose 6 consists of individual separate pressure chambers 6.1 -6.4, which - as can be seen in FIG. 2 - each have their own compressed air supply 7. They can be supplied with compressed air separately so that separate pressures can be set in chambers 6.1 -6.4.
  • the pressure hose 6 is preferably via a central one running parallel to the doctor rod 2
  • the tube 6 can be arranged separately on the back of the doctor bed 3 or can be made in one piece with it.
  • the individual pressure chambers 6.1 -6.4 are formed by - as shown in FIG. 2 - a series of pressure hoses 6.1 -6.4 are arranged in succession on the back of the doctor bed 3. Alternatively, a single pressure hose divided by partitions can also be used.
  • the individual pressure chambers 6.1-6.4 have a length of approximately 300-500 mm measured parallel to the doctor rod 2. This length can be in critical areas, especially at the edges of the web, less and in non-critical areas, e.g. B. in the middle of the roller 1 or the web, be longer. In particular, it is also possible to arrange separate pressure chambers at the edges only in critical areas in order to be able to work with a lower hose pressure there.
  • the hose 6 (or the hoses 6.1 -6.4) consists of a rubber-elastic material with the thinnest possible hose walls (wall thickness less than or equal to 3 mm), so that manufacturing inaccuracies do not have an effect on optimal positioning behavior and no hysteresis effects occur.
  • the hose 6 has a height parallel to the tangent to the roller 1 of 20-50 mm and is designed as a flat hose, i. H. its thickness radial to the roller 1 is less than its height. If a divided pressure hose 6 is used, the partitions between the individual pressure chambers 6.1 - 6.4 are also rubber-elastic, preferably of the same
  • the hose 6 is supported on its rear side facing away from the doctor bed 3 by a holder.
  • the doctor bed 3 is mounted in the holder 5, which is limited in terms of friction and can be moved with as little friction as possible in the direction of the roller 1, said holder being clamped in a clamping beam 9 fastened to a supporting beam 8.
  • the supporting beam 8 can be adjusted in the direction of the roller 1 in order to be able to set a preselected gap between the roller 1 or the web resting thereon and the doctor rod 2.
  • the compressed air connections 7 are guided to the outside through bores in the rear of the holder 5 and connected to a compressed air supply (not shown) via controllable valves in order to be able to regulate an individual pressure in each chamber 6.1-6.4.
  • An application system 11 is arranged in the direction of rotation of the roller 1 (arrow 10) in front of the metering system.
  • a nozzle applicator with an applicator chamber 1 2 which is closed at its outlet end by the metering system.
  • the application chamber 1 2 is delimited by an overflow plate 1 3 ending at a short distance from the roller 1, so that part of the coating material supplied via the adjustable feed channel 14 overflows on the inlet side to prevent the ingress of air and contaminants into the Prevent application chamber 1 1.
  • a preselected gap between the doctor rod 2 and the roller 1 is first set by adjusting the supporting beam 8. Coating material in the application chamber 1 2 is then applied in excess to the roller 1, and the pressure chambers 6.1 -6.4 are also applied
  • the process is carried out analogously if the application chamber 1 2 or another application system, eg. B. a roller application system, the coating material is applied directly to the web.
  • the doctor rod 2 then lies on the web and doses the amount of coating material directly on the web in the manner described above.

Landscapes

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

Abstract

Devices for coating paper or cardboard webs with a metering system which contains a doctor blade (2) as the metering component are known. The doctor blade (2) is held by a bed (3) of elastic, preferably rubber-elastic, material fitted in an adjustable holder (5) and supported on the rear away from the doctor blade (2) by a pressure hose (6) extending transversely across the working width. According to the invention, the pressure hose (6) is divided transversely over the working width into individual pressure chambers (6.1-6.4) to which compressed air can be separately applied.

Description

B E S C H R E I B U N G DESCRIPTION
Dosiersγstem für Vorrichtungen zum Beschichten von Materialbahnen, insbesondere Papier- oder KartonbahnenDosiersγstem for devices for coating material webs, in particular paper or cardboard webs
Technisches GebietTechnical field
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, in particular paper or cardboard webs, according to the preamble of patent claim 1.
Zum Beschichten von Papier- oder Kartonbahnen werden bekannterweise Vorrichtun¬ gen eingesetzt, die ein Auftragssystem 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 die Bahn in einem Bereich, in dem diese von einer Walze umgelenkt wird, oder indirekt zunächst auf eine ebenfalls dieAs is known, devices for coating paper or cardboard webs are used, which have an application system for applying coating material in excess and a subsequent metering system with a doctor element which doctor the excess down to the desired coat weight. The application and dosing is either carried out directly on the web in an area in which it is deflected by a roller, or indirectly initially also on the
Bahn umlenkenden Walze, die anschließend den dosierten Film von Beschichtungs¬ material an die Bahn übergibt.Web deflecting roller, which then transfers the metered film of coating material to the web.
Stand der TechnikState of the art
Aus der DE-A-30 22 955 ist ein gattungsgemäßes Dosiersystem mit einer Rakel¬ stange bekannt, die von einem Rakelbett aus gummielastischen Material erhalten wird. Das Rakelbett ist in einem mit dem Maschinengestell in Verbindung stehenden Halter gelagert und an seinem der Rakelstange abgewandten Rückseite von einem Druckschlauch abgestützt. Mit diesem System läßt sich die Dicke des dosierten FilmsFrom DE-A-30 22 955 a generic metering system with a doctor rod is known, which is obtained from a doctor bed made of rubber-elastic material. The doctor bed is mounted in a holder which is connected to the machine frame and is supported on its rear side facing away from the doctor rod by a pressure hose. With this system the thickness of the metered film can be measured
( = Strichgewicht) auf der Walze oder der Bahn nur begrenzt über den Schlauchdruck variieren, da es erforderlich ist, die Rakelstange mit einem gewissen Anpreßdruck gegen die Walze zu drücken, damit sich über die Arbeitsbreite ein gleichmäßiges Profil einstellt. Ist der für ein gleichmäßiges Profil erforderliche Anpreßdruck höher als der von der Gegenwalze weg wirkende hydrodynamische Gegendruck im Dosierspalt zwischen der Walze bzw. Bahn und der Rakelstange, so läßt sich das Strichgewicht über den Anpreßdruck nicht mehr nennenswert beeinflussen.(= Coating weight) on the roller or web only limited by the hose pressure vary, since it is necessary to press the doctor rod against the roller with a certain contact pressure so that a uniform profile is established over the working width. If the contact pressure required for a uniform profile is higher than the hydrodynamic counter pressure acting away from the counter roll in the metering gap between the roll or web and the squeegee rod, the coating weight can no longer be significantly influenced by the contact pressure.
Der relativ geringe Stellbereich wird durch Unregelmäßigkeiten der Bahn und/oder derThe relatively small adjustment range is caused by irregularities in the web and / or
Walze über die Arbeitsbreite weiter eingeschränkt. Falls im Querprofil lokal aufgrund der Unregelmäßigkeiten ein erhöhtes Strichgewicht auftritt, muß der Anpreßdruck erhöht werden, um wieder ein gleichmäßiges Querprofil zu erhalten. Dies beschränkt wiederum die Höhe des auftragbaren Strichgewichts.Roller further restricted across the working width. If an increased line weight occurs locally in the cross profile due to the irregularities, the contact pressure must be increased in order to obtain a uniform cross profile again. This in turn limits the height of the coat weight that can be applied.
Ähnliche Probleme treten auf, wenn Rakelstangen mit Umfangsrillen eingesetzt werden, so daß volumetrisch dosiert wird, also das Strichgewicht primär über den Rillenquerschnitt bestimmt wird. Diese Dosiersysteme reagieren unempfindlicher auf eine Änderung des Schlauchdrucks, so daß bei lokalen Unregelmäßigkeiten größere Druckänderungen erforderlich sind, die sich dann auf die gesamte Arbeitsbreite, also auch auf nicht zu korrigierende Bereiche, auswirken.Similar problems occur when doctor rods with circumferential grooves are used, so that metering is carried out volumetrically, that is to say the coating weight is determined primarily via the groove cross section. These metering systems are less sensitive to a change in hose pressure, so that in the event of local irregularities, larger pressure changes are required, which then have an effect on the entire working width, that is to say also on areas which cannot be corrected.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, den Stellbereich für das Strichgewicht bei einem gattungsgemäßen Dosiersystem zu erweitern, insbesondere höhere Strichge¬ wichte bei einem gleichmäßigen Auftrag erzielen zu können..The object of the invention is to expand the adjustment range for the coat weight in a metering system of the generic type, in particular to be able to achieve higher coat weights with a uniform application.
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 es möglich, den vom Druckschlauch erzeugten Anpreßdruck über die Arbeitsbreite lokal unterschiedlich einzustellen, um systembedingte Fehler zur Vergleichmäßigung des Strichgewichtes auszugleichen. Dies erweitert den Stellbereich für das Strichgewicht, da lokale Unregelmäßigkeiten sich bei der Strich- gewichtseinstellung nicht mehr über die gesamte Arbeitsbreite auswirken. Als weiterer Vorteil tritt hinzu, daß sich auch gezielt ein in einzelnen Bereichen unter¬ schiedliches Strichgewicht einstellen läßt, z. B. um Dickenschwankungen in einer Papierbahn auszugleichen oder an den Bahnrändern eine geringere Strichdicke zu erzielen.According to the invention, it is possible to set the contact pressure generated by the pressure hose locally differently over the working width in order to compensate for system-related errors in order to equalize the coat weight. This extends the adjustment range for the stroke weight, since local irregularities no longer affect the entire working width when adjusting the stroke weight. Another advantage is that a different stroke weight can be set in individual areas, e.g. B. to compensate for fluctuations in thickness in a paper web or to achieve a smaller line thickness at the edges of the web.
Die Unteransprüche enthalten bevorzugte, da besonders vorteilhafte Ausführungs¬ formen der Erfindung.The subclaims contain preferred, since particularly advantageous, embodiments of the invention.
Kurze Beschreibung der ZeichnungBrief description of the drawing
Die Zeichnung dient zur Erläuterung der Erfindung anhand eines vereinfacht darge¬ stellten Ausführungsbeispiels.The drawing serves to explain the invention on the basis of a simplified exemplary embodiment.
Figur 1 zeigt einen Längsschnitt durch ein Dosiersystem nach der ErfindungFigure 1 shows a longitudinal section through a metering system according to the invention
Figur 2 zeigt ausschnittsweise einen Querschnitt.Figure 2 shows a section of a cross section.
Wege zur Ausführung der ErfindungWays of Carrying Out the Invention
Das in Figur 1 gezeigte Dosiersystem ist Teil einer Vorrichtung zum Beschichten einer Papier- oder Kartonbahn, bei der ein vordosierter Film von Beschichtungsmaterial zunächst auf einer Walze 1 erzeugt und anschließend von dieser in einem Preßspalt zwischen der Walze 1 und einer weiteren Preßwalze an die Bahn abgegeben wird. DieThe metering system shown in Figure 1 is part of a device for coating a paper or cardboard web, in which a pre-metered film of coating material is first produced on a roller 1 and then released from the latter in a press nip between the roller 1 and a further press roller to the web becomes. The
Walze 1 ist daher in dem nicht in Figur 1 dargestellten Bereich teilweise von der Bahn umschlungen. Derartige Beschichtungsvorrichtungen sind z. B. in der DE-A-34 17 487 beschrieben.Roll 1 is therefore partially wrapped in the area not shown in Figure 1 by the web. Such coating devices are e.g. B. described in DE-A-34 17 487.
Ebenso kann das Dosiersystem zum direkten Dosieren auf einer Papierbahn eingesetzt werden, wie z. B. in der DE-A-30 22 955 dargestellt. Dann ist die Walze 1 in dem in Figur 1 dargestellten Bereich mit dem Dosiersystem von der Papier- oder Kartonbahn umschlungen. 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 bis 50 mm, vorzugsweise 10 mm bis 25 mm, ihre Länge entspricht der Arbeitsbreite der Beschichtungsvorrichtung, die bis zu 1 0 m betragen kann. Sie ist aus Edelstahl gefertigt, und ihre Mantelfläche ist verschleißfest beschichtet, z. B. verchromt oder mit Keramik beschichtet. Das die Rakelstange 2 haltende Rakelbett 3 ist aus einem elastischen, vorzugsweise gummi- elastischen Material mit einer Shore-Härte von ca. 80 gefertigt, im vorliegenden Aus¬ führungsbeispiel aus Gummi. In das Rakelbett 3 sind zur Rakelstange 1 offene Kanäle 4 eingearbeitet, in die während des Betriebes Wasser als Schmier- und Reinigungs¬ mittel eingeleitet wird.The dosing system can also be used for direct dosing on a paper web, such as. B. shown in DE-A-30 22 955. Then the roller 1 is wrapped in the area shown in Figure 1 with the metering system of the paper or cardboard web. The metering system contains as a metering element a doctor rod 2 which is rotatably mounted in a doctor bed 3 which is partially open towards the roller 1 by means of a rotary drive. The diameter of the doctor rod 2 is 8 to 50 mm, preferably 10 mm to 25 mm, its length corresponds to the working width of the coating device, which can be up to 10 m. It is made of stainless steel and its outer surface is coated so that it is wear-resistant, e.g. B. chrome 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 approximately 80, in the present exemplary embodiment made of rubber. In the doctor bed 3 open channels 4 are incorporated into the doctor rod 1, into which water is introduced as a lubricant and cleaning agent during operation.
Das Rakelbett 3 ist in einem zur Walze 1 hin offenen Betthalter 5 gelagert und weist an seiner der Walze 1 zugewandten Seite zwei schwalbenschwanzähnliche Verbreite¬ rungen auf, um das Eindringen von Beschichtungsmaterial in den Halter 5 zu verhin¬ dern. An seinem der Rakelstange 2 entgegengesetzten Rückseite ist das Rakelbett 3 im Halter 5 von einem sich quer über die Arbeitsbreite erstreckenden in Richtung zur Walze 1 drückenden Druckschlauch 6 abgestützt, der in einer angepaßten Aus¬ sparung des Halters 5 angeordnet ist. Der Druckschlauch 6 besteht aus einzelnen getrennten Druckkammern 6.1 -6.4, die - wie aus Figur 2 ersichtlich - jeweils eine eigene Druckluftzufuhr 7 aufweisen. Sie sind so getrennt mit Druckluft beaufschiag- bar, um in den Kammern 6.1 -6.4 getrennte Drücke einstellen zu können. Bevorzugt ist der Druckschlauch 6 über einen parallel zur Rakelstange 2 verlaufenden mittigenThe doctor bed 3 is mounted in a bed holder 5 which is open towards the roller 1 and has two dovetail-like widenings on its side facing the roller 1 in order to prevent the penetration of coating material into the holder 5. On its rear side opposite the squeegee rod 2, the squeegee bed 3 is supported in the holder 5 by a pressure hose 6, which extends across the working width and presses in the direction of the roller 1 and which is arranged in an adapted recess in the holder 5. The pressure hose 6 consists of individual separate pressure chambers 6.1 -6.4, which - as can be seen in FIG. 2 - each have their own compressed air supply 7. They can be supplied with compressed air separately so that separate pressures can be set in chambers 6.1 -6.4. The pressure hose 6 is preferably via a central one running parallel to the doctor rod 2
Steg mit dem Rakelbett 3 verbunden. Der Schlauch 6 kann getrennt an der Rückseite des Rakelbetts 3 angeordnet oder mit diesem aus einem Stück gefertigt sein.Web connected to the doctor bed 3. The tube 6 can be arranged separately on the back of the doctor bed 3 or can be made in one piece with it.
Die einzelnen Druckkammern 6.1 -6.4 werden gebildet, indem - wie in Fig. 2 gezeigt - an der Rückseite des Rakelbettes 3 eine Reihe von Druckschläuchen 6.1 -6.4 unmittel¬ bar aufeinanderfolgend angeordnet werden. Alternativ kann auch ein einziger, durch Zwischenwände unterteilter Druckschlauch eingesetzt werden.The individual pressure chambers 6.1 -6.4 are formed by - as shown in FIG. 2 - a series of pressure hoses 6.1 -6.4 are arranged in succession on the back of the doctor bed 3. Alternatively, a single pressure hose divided by partitions can also be used.
Die einzelnen Druckkammern 6.1 - 6.4 haben eine parallel zur Rakelstange 2 gemes- sene Länge von etwa 300 - 500 mm. Diese Länge kann in kritischen Bereichen, insbesondere an den Bahnrändern, geringer und in unkritischen Bereichen, z. B. in der Mitte der Walze 1 bzw. der Bahn, länger sein. Insbesondere ist es auch möglich, nur in kritischen Bereichen an den Rändern getrennte Druckkammern anzuordnen, um dort mit einem geringeren Schlauchdruck arbeiten zu können.The individual pressure chambers 6.1-6.4 have a length of approximately 300-500 mm measured parallel to the doctor rod 2. This length can be in critical areas, especially at the edges of the web, less and in non-critical areas, e.g. B. in the middle of the roller 1 or the web, be longer. In particular, it is also possible to arrange separate pressure chambers at the edges only in critical areas in order to be able to work with a lower hose pressure there.
Der Schlauch 6 (bzw. die Schläuche 6.1 -6.4) besteht aus einem gummielastischen Material mit möglichst dünnen Schlauchwänden (Wanddicke kleiner/gleich 3 mm), damit sich für ein optimales Stellverhalten Fertigungsungenauigkeiten nicht auswirken und keine Hystereseeffekte auftreten. Der Schlauch 6 weist eine Höhe parallel zur Tangente an die Walze 1 von 20 - 50 mm auf und ist als Flachschlauch ausgebildet, d. h. seine Dicke radial zur Walze 1 ist geringer als seine Höhe. Falls ein unterteilter Druckschlauch 6 eingesetzt wird, sind die Trennwände zwischen den einzelnen Druckkammern 6.1 - 6.4 ebenfalls gummielastisch, vorzugsweise aus dem gleichenThe hose 6 (or the hoses 6.1 -6.4) consists of a rubber-elastic material with the thinnest possible hose walls (wall thickness less than or equal to 3 mm), so that manufacturing inaccuracies do not have an effect on optimal positioning behavior and no hysteresis effects occur. The hose 6 has a height parallel to the tangent to the roller 1 of 20-50 mm and is designed as a flat hose, i. H. its thickness radial to the roller 1 is less than its height. If a divided pressure hose 6 is used, the partitions between the individual pressure chambers 6.1 - 6.4 are also rubber-elastic, preferably of the same
Material wie der Schlauch 6 und mit gleicher Wandstärke gefertigt, damit an den Grenzbereichen zwischen den Druckkammern 6.1 - 6.4 ebenfalls auf die Rakelstange 1 eingewirkt werden kann.Material like the hose 6 and made with the same wall thickness, so that the doctor rod 1 can also be acted on at the border areas between the pressure chambers 6.1 - 6.4.
Wichtig ist, daß der Schlauch 6 an seiner dem Rakelbett 3 abgewandten Rückseite von einem Halter abgestützt ist. Im vorliegenden Beispiel ist vorteilhaft ein gemein¬ samer Halter 5 für das Rakelbett 3 und den Schlauch 6 vorhanden. Ebenso ist es möglich, das Bett 3 und den Schlauch 6 jeweils an einem eigenen Halter zu befesti¬ gen, die dann gemeinsam in Richtung zur Walze 1 verstellbar (z. B. in einem ver- stellbaren Traggestell) gelagert sind.It is important that the hose 6 is supported on its rear side facing away from the doctor bed 3 by a holder. In the present example, there is advantageously a common holder 5 for the doctor bed 3 and the tube 6. It is also possible to attach the bed 3 and the hose 6 to a separate holder, which are then jointly adjustable in the direction of the roller 1 (for example, in an adjustable support frame).
Im vorliegenden Ausführungsbeispiel ist das Rakelbett 3 in Richtung zur Walze 1 über den erforderlichen Stellweg möglichst reibungsarm begrenzt beweglich in dem Halter 5 gelagert, der in einem an einem Tragbalken 8 befestigten Klemmbalken 9 festge- klemmt ist. Der Tragbalken 8 ist in Richtung zur Walze 1 verstellbar, um einen vor¬ gewählten Spalt zwischen der Walze 1 bzw. der auf ihr aufliegenden Bahn und dem Rakelstab 2 einstellen zu können. Die Druckluftanschlüsse 7 sind durch Bohrungen in der Rückseite des Halters 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 regeln zu können. In Drehrichtung der Walze 1 (Pfeil 10) vor dem Dosiersystem ist ein Auftragsystem 1 1 angeordnet. Im vorliegenden Beispiel ein Düsenauftragwerk mit einer Auftragkam- mer 1 2, die an ihrem auslaufseitigen Ende von dem Dosiersystem abgeschlossen ist.In the present exemplary embodiment, the doctor bed 3 is mounted in the holder 5, which is limited in terms of friction and can be moved with as little friction as possible in the direction of the roller 1, said holder being clamped in a clamping beam 9 fastened to a supporting beam 8. The supporting beam 8 can be adjusted in the direction of the roller 1 in order to be able to set a preselected gap between the roller 1 or the web resting thereon and the doctor rod 2. The compressed air connections 7 are guided to the outside through bores in the rear of the holder 5 and connected to a compressed air supply (not shown) via controllable valves in order to be able to regulate an individual pressure in each chamber 6.1-6.4. An application system 11 is arranged in the direction of rotation of the roller 1 (arrow 10) in front of the metering system. In the present example, a nozzle applicator with an applicator chamber 1 2, which is closed at its outlet end by the metering system.
An dem einlaufseitigen Ende ist die Auftragkammer 1 2 von einer mit geringem Abstand von der Walze 1 endenden Überlaufplatte 1 3 begrenzt, so daß ein Teil des über den einstellbaren Zufuhrkanal 14 zugeführten Beschichtungsmaterials an der Einlaufseite überfließt, um das Eindringen von Luft und Verunreinigungen in die Auftragkammer 1 1 zu verhindern.At the inlet end, the application chamber 1 2 is delimited by an overflow plate 1 3 ending at a short distance from the roller 1, so that part of the coating material supplied via the adjustable feed channel 14 overflows on the inlet side to prevent the ingress of air and contaminants into the Prevent application chamber 1 1.
Vor Beginn des Beschichtungsvorgangs wird zunächst durch Verstellung des Tragbal¬ kens 8 ein vorgewählter Spalt zwischen der Rakelstange 2 und der Walze 1 einge¬ stellt. Anschließend wird Beschichtungsmaterial in der Auftragkammer 1 2 im Über- schuß auf die Walze 1 aufgetragen, und die Druckkammern 6.1 -6.4 werden mitBefore the coating process begins, a preselected gap between the doctor rod 2 and the roller 1 is first set by adjusting the supporting beam 8. Coating material in the application chamber 1 2 is then applied in excess to the roller 1, and the pressure chambers 6.1 -6.4 are also applied
Druckluft beaufschlagt, so daß die Rakelstange 2 in Richtung zur Walze 1 gedrückt wird. Die Rakelstange 2 räkelt das im Überschuß aufgetragene Beschichtungsmaterial bis auf das gewünschte Strichgewicht wieder ab. In Abhängigkeit von dem Strichge¬ wicht in den einzelnen Walzenbereichen, wird in den zugehörigen Schlauchabschnit- ten (Druckkammern 6.1 -6.4) ein Überdruck zwischen 0,3 und 1 ,3 bar eingestellt. Je höher der Druck in einem Abschnitt ist, desto geringer stellt sich das Strichgewicht in diesem Abschnitt ein. So läßt sich sowohl das Strichgewicht vergleichmäßigen, als auch - falls gewünscht - in einzelnen Bereichen gezielt ein unterschiedliches Strichge¬ wicht einstellen. Das auf die Walze 1 aufgetragene Beschichtungsmaterial wird anschließend in einem Preßspalt an die Papier- oder Kartonbahn übergeben.Compressed air is applied so that the doctor rod 2 is pressed in the direction of the roller 1. The squeegee rod 2 lifts off the coating material applied in excess to the desired coat weight. Depending on the line weight in the individual roller areas, an overpressure between 0.3 and 1.3 bar is set in the associated hose sections (pressure chambers 6.1-6.4). The higher the pressure in a section, the lower the coating weight in this section. In this way, both the coat weight can be made uniform and, if desired, a different coat weight can be set in individual areas. The coating material applied to the roller 1 is then transferred to the paper or cardboard web in a press nip.
Analog wird das Verfahren durchgeführt, falls von der Auftragkammer 1 2 oder einem anderen Auftragsystem, z. B. einem Walzen-Auftragssystem, das Beschichtungs¬ material direkt auf die Bahn aufgetragen wird. Dann liegt die Rakelstange 2 auf der Bahn auf und dosiert die Menge an Beschichtungsmaterial auf die vorstehend beschriebene Weise direkt auf der Bahn. The process is carried out analogously if the application chamber 1 2 or another application system, eg. B. a roller application system, the coating material is applied directly to the web. The doctor rod 2 then lies on the web and doses the amount of coating material directly on the web in the manner described above.

Claims

PATENTANSPRÜ CHE PATENT CLAIMS
1.1.
Dosiersystem für Vorrichtungen zum Beschichten von Materialbahnen, insbesonde¬ re Papier- oder Kartonbahnen, mit einer Rakelstange (2) als Dosierelement, die von einem Rakelbett (3) aus elastischem, bevorzugt gummielastischen, Material gehalten wird, das in einem verstellbaren Halter (5) gelagert ist und an seiner derDosing 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 held in an adjustable holder (5) is stored and at its
Rakelstange (2) abgewandten Rückseite von einem sich quer über die Arbeitsbreite erstreckenden Druckschlauch (6) abgestützt ist, d adurch ge kenn¬ zeichnet, daß der Druckschlauch (6) quer über die Arbeitsbreite in einzelne Druckkammern (6.1-6.4) unterteilt ist, die jeweils getrennt mit Druckluft beauf- schlagbar sind.Doctor rod (2) facing away from the back is supported by a pressure hose (6) extending across the working width, characterized by the fact that the pressure hose (6) is divided into individual pressure chambers (6.1-6.4) across the working width compressed air can be applied separately.
2.Second
Dosiersystem nach Anspruch 1, dadurch gekennzeichnet, daß das Rakelbett (3) und der Druckschlauch (6) in einem gemeinsamen, quer verstell- barem Halter (5) angeordnet sind.Dosing system according to claim 1, characterized in that the doctor bed (3) and the pressure hose (6) are arranged in a common, transversely adjustable holder (5).
3.Third
Dosiersystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Schlauch (6) aus einem gummielastischen Material gefertigt ist und eine Wanddicke von kleiner/gleich 3 mm aufweist.Dosing system according to claim 1 or 2, characterized in that the hose (6) is made of a rubber-elastic material and has a wall thickness of less than / equal to 3 mm.
4.4th
Dosiersystem nach Anspruch 2 oder 3, d adurch gekennzeichnet, daß jede Druckkammer (6.1-6.4) einen Druckluftanschluß (7) aufweist, der durch die Rückseite des Halters (5) nach außen geführt ist. Dosing system according to claim 2 or 3, characterized in that each pressure chamber (6.1-6.4) has a compressed air connection (7) which is guided outwards through the rear of the holder (5).
PCT/EP1994/003885 1993-12-06 1994-11-24 Metering system for devices for coating materials webs, especially paper or cardboard webs WO1995016074A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59407565T DE59407565D1 (en) 1993-12-06 1994-11-24 DOSING SYSTEM FOR DEVICE FOR COATING MATERIAL SHEETS, IN PARTICULAR PAPER OR CARDBOARD SHEETS
JP7515920A JPH08506525A (en) 1993-12-06 1994-11-24 Metering system for devices for coating strips, especially paper or carton strips
EP95903275A EP0682728B1 (en) 1993-12-06 1994-11-24 Metering system for devices for coating materials webs, especially paper or cardboard webs
FI953719A FI100814B (en) 1993-12-06 1995-08-04 Dosing system for devices for coating material webs, special paper or cardboard webs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4341341.2 1993-12-06
DE4341341A DE4341341C1 (en) 1993-12-06 1993-12-06 Metering system for devices for coating material webs, in particular paper or board webs

Publications (1)

Publication Number Publication Date
WO1995016074A1 true WO1995016074A1 (en) 1995-06-15

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PCT/EP1994/003885 WO1995016074A1 (en) 1993-12-06 1994-11-24 Metering system for devices for coating materials webs, especially paper or cardboard webs

Country Status (7)

Country Link
EP (1) EP0682728B1 (en)
JP (1) JPH08506525A (en)
AT (1) ATE175251T1 (en)
DE (2) DE4341341C1 (en)
ES (1) ES2128035T3 (en)
FI (1) FI100814B (en)
WO (1) WO1995016074A1 (en)

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US9427767B2 (en) 2012-02-23 2016-08-30 Panasonic Intellectual Property Management Co., Ltd. Apparatus for applying coating liquid and coating bar

Also Published As

Publication number Publication date
FI100814B (en) 1998-02-27
FI953719A0 (en) 1995-08-04
DE4341341C1 (en) 1995-03-09
ES2128035T3 (en) 1999-05-01
ATE175251T1 (en) 1999-01-15
FI953719A (en) 1995-08-04
JPH08506525A (en) 1996-07-16
DE59407565D1 (en) 1999-02-11
EP0682728B1 (en) 1998-12-30
EP0682728A1 (en) 1995-11-22

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