EP2570194B1 - Squeegee metering system - Google Patents

Squeegee metering system Download PDF

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Publication number
EP2570194B1
EP2570194B1 EP12178051.4A EP12178051A EP2570194B1 EP 2570194 B1 EP2570194 B1 EP 2570194B1 EP 12178051 A EP12178051 A EP 12178051A EP 2570194 B1 EP2570194 B1 EP 2570194B1
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EP
European Patent Office
Prior art keywords
doctor
bed
supporting part
base
metering system
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
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EP12178051.4A
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German (de)
French (fr)
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EP2570194A1 (en
Inventor
Reinhard Knop
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Horst Sprenger GmbH
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Horst Sprenger GmbH
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Publication of EP2570194A1 publication Critical patent/EP2570194A1/en
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Publication of EP2570194B1 publication Critical patent/EP2570194B1/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
    • B05C11/023—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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
    • 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
    • D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades

Definitions

  • the invention relates to a doctor metering system for a device for coating a material web, in particular paper or board web, with a doctor rod as metering element, which is mounted in a groove of a doctor bed, which is removably mounted in the frame of the system.
  • a squeegee system of the generic type is in the WO 03/078077 A1 described.
  • the doctor bar is held in a doctor bed of elastomeric material which is stored in a holder associated with the machine frame.
  • the squeegee bed is supported by a pressure hose, so that the thickness of the metered film on the roller or the web can be limited by the pressure in the pressure hose.
  • the squeegee bars are usually made of steel with a diameter between 6 mm - 40 mm. Depending on the application, squeegee bars with a smooth outer surface or squeegee bars with circumferential grooves are used. In the case of doctor blades with a smooth lateral surface, a small gap is created during operation to the web to be coated, through which the coating material passes in the desired amount.
  • the doctoring and metering system is preferably used in a region in which the web is supported by a counter-roller. Squeegee bars with circumferential grooves abut when dosing on the web or the roller. The remaining coating weight is determined primarily by the groove cross section through which the coating material can pass.
  • the rotating doctor blade rod in operation causes considerable wear of the doctor bed, especially when abrasive pigment coatings are used in the coating of paper or board webs.
  • the material and production-intensive doctor beds must therefore be replaced at regular intervals.
  • a relatively small diameter doctor bed is removably inserted into a groove of a holder at the front thereof.
  • the doctor bed is designed as small as possible wearing part and can be easily installed and removed with inserted doctor rod.
  • a squeegee device which is modular, comprising a head part and a foot part.
  • the head part is provided with a first holder for receiving it pressure hose and the foot part with a second holder for receiving a clamping tube.
  • the doctor device leaves Install and remove as a unit with the hoses, especially to realize a hose change outside the machine.
  • the invention has for its object to make a doctor metering system so that both allows a quick change of wearing parts, as well as a simple cleaning, for example, with high-pressure cleaners allows.
  • the system consists of two separately removable from the machine frame components.
  • the first component contains the doctor bed with the doctor rod, optionally with an additional holding part. It is supported on its back by a second component, to which both the hose for pressing the doctor bed and a member for clamping the feet are fixed in the system.
  • the wear parts can be so in case of wear by easier release of the clamping element of the frame remove, leaving the support member with the pressure hose and the clamping element in the machine.
  • the design of the doctor bed can be made so that it consists of one piece of the doctor rod holding part and a downwardly extending foot-like extension.
  • the doctor bed including the extension is preferably supported on the entire back of the support member. His foot is clamped together with the foot of the support and holding part by means of the clamping element in the system.
  • the doctor bed can be arranged in a separate holding part, as for example in the WO 03/078077 A1 is described. Then the support member supports the additional holding the doctor bed holding part at the back.
  • the additional holding member also has a downwardly extending foot, which is clamped together with the foot of the support member by means of the clamping member in the context of the system.
  • the clamping element is attached to the back of the support member clamping hose. This ensures an automatic adaptation to manufacturing or installation inaccuracies.
  • a clamping rod it can also be advantageously mounted vertically movable as a clamping element on the support member, a clamping rod.
  • the clamp bar is located at the rear of the support member and clamps downwardly as it moves downwardly between a foot of the support member and the frame. This will cause a mechanical lock.
  • the foot has a cross-section widening downwards.
  • the dosing systems shown in the figures are part of an apparatus for coating a paper or board web 1 with a coating color. When directly applied to the web this is supported in the dosing of a counter-roller 2.
  • the metering dosing system can be used for indirect dosing, in which a predosed film of coating material is first applied to a roller and then discharged from this to the web.
  • a known application system (nozzle applicator, roller applicator, etc.) is arranged, is applied by the coating color in excess to the web 1 or - in the indirect dosing - on the roller 2.
  • an application chamber 15 is arranged in front of the dosing, which is bounded on the inlet side by an overflow plate 16.
  • In the application chamber 15 opens a supply line 17, is supplied by the coating material in excess. The excess passes through the gap between the overflow plate 16 and the roller 2.
  • the metering metering system contains a metering element as a doctor bar 3 which is rotatably mounted in a direction towards the web 1 partially open doctor bed 4 by means of a rotary drive.
  • the lateral surface of the doctor bar 3 is provided either smooth or circumferential grooves. Its diameter is 6 mm - 40 mm, preferably 9 mm - 25 mm.
  • the axial length of the doctor bar 3 corresponds to the working width of the coating device, which may be 10 m or more.
  • the doctor bar 3 is made of stainless steel, and its outer surface is wear-resistant coated, for example, chrome-plated or coated with ceramic.
  • the doctor bed 4 is preferably made of an at least limited elastic material. Suitable materials are elastomers, preferably polyurethane or polyethylene. The hardness of the material is chosen so that the bed 4 can be sealingly applied to the doctor bar 3 in order to prevent penetration of coating color into the bed 4.
  • the doctor bed 4 has a groove 5, in which the doctor bar 3 is inserted, the doctor bed 4, the doctor bar 3 in an angular range of at least 180 °, so that it is held securely.
  • the doctor bed 4 is configured over the working width of the coating device, ie the length of the doctor bar 3 with a constant cross section. It contains at least one channel 6 which is open toward the doctor bar 3 and into which water is introduced as lubricant and cleaning agent during operation.
  • the doctor blade bed 4 carrying the doctor bar 3 is clamped with a foot-like part 8 in the frame 9 of the system.
  • the doctor bed 4 is extended down to a foot 8.
  • the doctor bed 4 in a holding part 10th mounted, which also has a downwardly extending foot 8, with which it can be firmly clamped in the frame 9.
  • a support member 7 is arranged on the side facing away from the doctor bar 3 back of the doctor bed 4, since either the doctor bed 4 directly ( FIG. 1 ) or the holding part 10 is supported with the doctor bed 4 therein flat on the back.
  • the support member 7 is designed separately from the doctor bed 3 or the holding part 10, it supports these parts only at the back from. Thus, the support member 7 can be removed separately from the doctor bed 4 / holding part 10 removed from the dosing and reinstalled.
  • a pressure hose 11 is fixed at the level of the doctor rod 3, which serves to adjust the contact pressure of the doctor rod 3.
  • the pressure hose 11 is supported on the side facing away from the doctor bed 4 on a profile rail 21 mounted in the frame 9.
  • the profile strip 21 can be adjusted by means of screws 22 toward the pressure hose 11 back and forth. If a profiling over the machine width should be possible, the profile strip 21 is limited elastic, and there are over the machine width a number of screws 22 spaced from each other to selectively bend the profile strip 21 in individual areas.
  • a clamping element is attached, which is arranged on the back of the support member 7 in the region of the foot 12 acts. It serves to clamp the doctor bed 4 or the holding part 10 together with the foot 12 in the frame 9 of the system. For this purpose, when inserting the parts of the foot 8 of the doctor bed 4 or the holding part 10 between the foot 12 of the support member and the frame 9 is clamped.
  • a clamping hose 14 By applying the clamping hose 14 with air this presses against the frame 9 and thus fixes the two feet 8, 12th
  • the foot 12 of the support member 7 is mechanically clamped and locked with the foot 8 of the doctor bed 4.
  • the foot 12 has a wedge-shaped cross-section widening downwards.
  • a clamping rod 18 is arranged vertically movable on its rear side, which clamps in the movement down between the foot 12 and the frame 9.
  • the clamping rod 18 is secured at its upper edge to a plurality of thin lifting plates 19 which are vertically movable by a vertical gap 20 in the upper part of the support member 7 movable.
  • the lifting plates 19 can be so lower the clamping bar 18 for clamping and locking and lift to release and unlock.
  • the upper end of the lifting plate 19 is attached to the top of the support member 7 so that it can be removed together with the clamp rod 18 attached to it from the frame 9.
  • the clamping rod 18 may also be attached to one or more lifting wires, which are then also mounted vertically movable on the support member 7.
  • the pressure hose 11 is also supported on the frame 9 for pressing the doctor rod 3.
  • the point of action of the clamping element is the point of attachment of the clamping tube 14.
  • the doctor bed 4 according to the FIGS. 1 and 3 , as well as the holding part 10 after FIG. 2 are also designed with a reduced diameter in the area of the weak point 13, so that the upper parts can tilt.

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft ein Rakel-Dosiersystem für eine Vorrichtung zum Beschichten einer Materialbahn, insbesondere Papier- oder Kartonbahn, mit einer Rakelstange als Dosierelement, die in einer Nut eines Rakelbetts gelagert ist, das herausnehmbar im Rahmen des Systems befestigt ist.The invention relates to a doctor metering system for a device for coating a material web, in particular paper or board web, with a doctor rod as metering element, which is mounted in a groove of a doctor bed, which is removably mounted in the frame of the system.

Zum Beschichten von laufenden Papier- oder Kartonbahnen werden bekannterweise Vorrichtungen eingesetzt, die ein Auftragssystem zum Auftragen eines flüssigen Beschichtungsmaterials im Überschuss und ein nachfolgendes Dosiersystem mit einer Rakelstange als Dosierelement aufweisen. Die Rakelstange rakelt den Überschuss an Beschichtungsmaterial bis auf das gewünschte Strichgewicht wieder ab. Das Auftragen und Dosieren erfolgt entweder direkt auf die Bahn oder indirekt zunächst auf eine die Bahn umlenkende Walze, die anschließend den dosierten Film von Beschichtungsmaterial an die Bahn abgibt.For coating of running paper or board webs devices are known to be used, which have an application system for applying a liquid coating material in excess and a subsequent dosing with a doctor bar as dosing. The doctor rod scrapes the surplus of coating material down to the desired coating weight. The application and metering takes place either directly on the web or indirectly first on a web deflecting roller, which then delivers the metered film of coating material to the web.

Ein Rakel-System der gattungsgemäßen Art ist in der WO 03/078077 A1 beschrieben. Die Rakelstange wird in einem Rakelbett aus gummielastischem Material gehalten, das in einem mit dem Maschinengestell in Verbindung stehenden Halter gelagert ist. An seiner der Rakelstange abgewandten Rückseite wird das Rakelbett von einem Druckschlauch abgestützt, so dass sich die Dicke des dosierten Films auf der Walze oder der Bahn begrenzt über den Druck im Druckschlauch variieren lässt.A squeegee system of the generic type is in the WO 03/078077 A1 described. The doctor bar is held in a doctor bed of elastomeric material which is stored in a holder associated with the machine frame. At its rear side facing away from the squeegee rod, the squeegee bed is supported by a pressure hose, so that the thickness of the metered film on the roller or the web can be limited by the pressure in the pressure hose.

Die Rakelstangen sind üblicherweise aus Stahl mit einem Durchmesser zwischen 6 mm - 40 mm gefertigt. Je nach Anwendungsfall werden Rakelstangen mit glatter Mantelfläche oder Rakelstangen mit Umfangsrillen eingesetzt. Bei Rakelstangen mit glatter Mantelfläche stellt sich im Betrieb ein geringer Spalt zu der zu beschichtenden Bahn ein, durch den das Beschichtungsmaterial in der gewünschten Menge durchtritt. Beim direkten Auftragen auf eine Bahn wird das Rakel- und Dosiersystem bevorzugt in einem Bereich eingesetzt, in dem die Bahn von einer Gegenwalze abgestützt wird. Rakelstangen mit Umfangsrillen liegen beim Dosieren an der Bahn oder der Walze an. Das verbleibende Strichgewicht wird primär durch den Rillenquerschnitt bestimmt, durch den das Beschichtungsmaterial durchtreten kann.The squeegee bars are usually made of steel with a diameter between 6 mm - 40 mm. Depending on the application, squeegee bars with a smooth outer surface or squeegee bars with circumferential grooves are used. In the case of doctor blades with a smooth lateral surface, a small gap is created during operation to the web to be coated, through which the coating material passes in the desired amount. When applied directly to a web, the doctoring and metering system is preferably used in a region in which the web is supported by a counter-roller. Squeegee bars with circumferential grooves abut when dosing on the web or the roller. The remaining coating weight is determined primarily by the groove cross section through which the coating material can pass.

Die sich in Betrieb drehende Rakelstange bewirkt einen erheblichen Verschleiß des Rakelbettes, insbesondere wenn beim Beschichten von Papier- oder Kartonbahnen abrasive Pigmentstreichfarben verwendet werden. Die material- und fertigungsintensiven Rakelbetten müssen daher in regelmäßigen Intervallen ausgetauscht werden.The rotating doctor blade rod in operation causes considerable wear of the doctor bed, especially when abrasive pigment coatings are used in the coating of paper or board webs. The material and production-intensive doctor beds must therefore be replaced at regular intervals.

Um die durch den Verschleiß bedingten Ersatzkosten zu verringern und einen schnellen Austausch eines Rakelbettes oder einer Rakelstange zu ermöglichen, ist bei dem Rakel-Dosiersystem nach der WO 03/078077 A1 ein Rakelbett mit relativ geringem Durchmesser in eine Nut eines Halters an dessen Vorderseite herausnehmbar eingesetzt. Das Rakelbett ist als möglichst kleines Verschleißteil ausgeführt und kann einfach mit eingelegter Rakelstange ein- und ausgebaut werden.In order to reduce the replacement costs caused by the wear and to enable a quick exchange of a doctor bed or a doctor bar, is in the doctor metering after the WO 03/078077 A1 a relatively small diameter doctor bed is removably inserted into a groove of a holder at the front thereof. The doctor bed is designed as small as possible wearing part and can be easily installed and removed with inserted doctor rod.

Aus der EP 1 761 341 B1 ist eine Rakelvorrichtung bekannt, die baukastenartig, ein Kopfteil und ein Fußteil aufweisend, aufgebaut ist. Das Kopfteil ist mit einer ersten Halterung zur Aufnahme es Anpressschlauches und das Fußteil mit einer zweiten Halterung zur Aufnahme eines Klemmschlauches versehen. Die Rakelvorrichtung lässt sich als Einheit mit den Schläuchen ein- und ausbauen, insbesondere um einen Schlauchwechsel außerhalb der Maschine zu realisieren.From the EP 1 761 341 B1 a squeegee device is known which is modular, comprising a head part and a foot part. The head part is provided with a first holder for receiving it pressure hose and the foot part with a second holder for receiving a clamping tube. The doctor device leaves Install and remove as a unit with the hoses, especially to realize a hose change outside the machine.

Der Erfindung liegt die Aufgabe zugrunde, ein Rakel-Dosiersystem so zu gestalten, dass sowohl einen schnellen Wechsel von Verschleißteilen ermöglicht, als auch eine einfache Reinigung beispielsweise mit Hochdruckreinigern ermöglicht.The invention has for its object to make a doctor metering system so that both allows a quick change of wearing parts, as well as a simple cleaning, for example, with high-pressure cleaners allows.

Dieser Aufgabe wird nach der Erfindung dadurch gelöst, dass an der zur Rakelstange abgewandten Rückseite des Rakelbetts ein Abstützteil angeordnet ist, welches

  • das Rakelbett oder ein das Rakelbett haltendes Halteteil auf der Rückseite abstützt,
  • getrennt von dem Rakelbett oder dem das Rakelbett haltenden Halteteil aus dem Dosiersystem entfernbar gestaltet ist, und
  • an dessen dem Rakelbett abgewandten Rückseite in Höhe der Rakelstange ein Druckschlauch befestigt und ein im Bereich des Fußes des Abstützteils wirkendes Klemmelement angeordnet ist,
wobei das Rakelbett (4) nach unten zu einem Fuß (8) verlängert ist, der gemeinsam mit dem Fuß (12) des Abstützteils (7) mittels des Klemmelementes (14, 18) im Rahmen (9) des Systems festklemmbar ist.This object is achieved according to the invention in that on the side facing away from the doctor bar back of the doctor bed, a support member is arranged, which
  • supports the doctor bed or a holding part holding the doctor bed on the back,
  • separated from the doctor bed or the holding the doctor blade holding part from the dosing system is removable, and
  • at the side facing away from the doctor blade bed, a pressure hose is fastened at the level of the doctor rod and a clamping element acting in the region of the foot of the support part is arranged,
the doctor bed (4) being extended downwards to a foot (8) which, together with the foot (12) of the support part (7), can be clamped in the frame (9) of the system by means of the clamping element (14, 18).

Nach der Erfindung besteht das System aus zwei getrennt aus dem Maschinengestell entnehmbaren Bauteilen. Das erste Bauteil enthält das Rakelbett mit der Rakelstange, gegebenenfalls mit einem zusätzlichen Halteteil. Es wird an seiner Rückseite von einem zweiten Bauteil abgestützt, an dem sowohl der Schlauch zum Andrücken des Rakelbetts als auch ein Element zum Festklemmen der Füße im Rahmen des Systems befestigt sind.According to the invention, the system consists of two separately removable from the machine frame components. The first component contains the doctor bed with the doctor rod, optionally with an additional holding part. It is supported on its back by a second component, to which both the hose for pressing the doctor bed and a member for clamping the feet are fixed in the system.

Die Verschleißteile (Rakelbett, Rakelstab) lassen sich so bei Verschleiß durch einfacheres Lösen des Klemmelements aus dem Rahmen entfernen, wobei das Abstützteil mit dem Druckschlauch und dem Klemmelement in der Maschine verbleibt.The wear parts (doctor bed, doctor bar) can be so in case of wear by easier release of the clamping element of the frame remove, leaving the support member with the pressure hose and the clamping element in the machine.

Ebenso ist es möglich, das Abstützteil mit dem daran befestigten Klemmelement aus dem Rahmen einfach zu entfernen. Dies erfolgt, falls die Klemmung gereinigt werden soll, was beispielsweise mit Hochdruckreinigern zwangsläufig nur in der Maschine selbst erfolgen kann. Ebenso wird das Abstützteil ausgebaut, wenn ein Schlauch oder ein Klemmelement defekt ist.It is also possible to easily remove the support member with the attached clamping element from the frame. This is done if the clamp is to be cleaned, which can be done for example with high-pressure cleaners inevitably only in the machine itself. Likewise, the support member is removed if a hose or a clamping element is defective.

Die Gestaltung des Rakelbetts kann so erfolgen, dass es einteilig aus einem die Rakelstange haltenden Teil und einer sich nach unten erstreckenden fußartigen Verlängerung besteht. Das Rakelbett einschließlich der Verlängerung wird dabei bevorzugt auf der gesamten Rückseite von dem Abstützteil abgestützt. Sein Fuß wird gemeinsam mit dem Fuß des Abstütz- und Halteteils mittels des Klemmelements im Rahmen des Systems festgeklemmt.The design of the doctor bed can be made so that it consists of one piece of the doctor rod holding part and a downwardly extending foot-like extension. The doctor bed including the extension is preferably supported on the entire back of the support member. His foot is clamped together with the foot of the support and holding part by means of the clamping element in the system.

Alternativ kann das Rakelbett in einem getrennten Halteteil angeordnet werden, wie es beispielsweise in der WO 03/078077 A1 beschrieben ist. Dann stützt das Abstützteil das zusätzliche, das Rakelbett haltenden Halteteil an dessen Rückseite ab. Das zusätzliche Halteteil weist ebenfalls einen sich nach unten erstreckenden Fuß auf, der gemeinsam mit dem Fuß des Abstützteils mittels des Klemmelements im Rahmen des Systems festklemmbar ist.Alternatively, the doctor bed can be arranged in a separate holding part, as for example in the WO 03/078077 A1 is described. Then the support member supports the additional holding the doctor bed holding part at the back. The additional holding member also has a downwardly extending foot, which is clamped together with the foot of the support member by means of the clamping member in the context of the system.

Bei einer vorteilhaften Ausführungsform ist das Klemmelement ein an der Rückseite des Abstützteils befestigter Klemmschlauch. Dies gewährleistet eine selbsttätige Anpassung an Fertigungs- oder Einbauungenauigkeiten.In an advantageous embodiment, the clamping element is attached to the back of the support member clamping hose. This ensures an automatic adaptation to manufacturing or installation inaccuracies.

Alternativ kann auch vorteilhaft als Klemmelement an dem Abstützteil eine Klemmstange vertikal beweglich befestigt sein. Die Klemmstange ist an der Rückseite des Abstützteils angeordnet und klemmt sich bei der Bewegung nach unten zwischen einem Fuß des Abstützteils und dem Rahmen fest. So wird eine mechanische Verriegelung bewirkt. Dazu weist der Fuß einen sich nach unten verbreiternden Querschnitt auf. Diese Ausführungsform hat den Vorteil, dass selbst bei einem Ausfall oder einer Beschädigung von haltenden Elementen, beispielsweise bei einem Druckluftausfall, die Dosierelemente sicher in dem System gehalten werden.Alternatively, it can also be advantageously mounted vertically movable as a clamping element on the support member, a clamping rod. The clamp bar is located at the rear of the support member and clamps downwardly as it moves downwardly between a foot of the support member and the frame. This will cause a mechanical lock. For this purpose, the foot has a cross-section widening downwards. These Embodiment has the advantage that even with a failure or damage of holding elements, for example in a compressed air failure, the metering be securely held in the system.

Nachfolgend wird die Erfindung an Hand dreier vereinfacht dargestellter Ausführungsbeispiele beschrieben. Es zeigen

- Figur 1
den Querschnitt durch ein Rakel-Dosiersystem mit einem Rakelbett, das zum Festklemmen ein verlängertes Fußteil aufweist,
- Figur 2
den Querschnitt durch eine Ausführungsform, bei der das Rakelbett in einem getrennten Halteteil gelagert ist, und
- Figur 3
den Querschnitt durch ein Rakel-Dosiersystem mit einer Klemmstange als Klemmelement.
The invention will be described with reference to three simplified illustrated embodiments. Show it
- Figure 1
the cross section through a doctor metering system with a doctor bed, which has an extended foot part for clamping,
- Figure 2
the cross section through an embodiment in which the doctor bed is mounted in a separate holding part, and
- Figure 3
the cross section of a doctor metering system with a clamping rod as a clamping element.

Die in den Figuren dargestellten Dosiersysteme sind Teil einer Vorrichtung zum Beschichten einer Papier- oder Kartonbahn 1 mit Streichfarbe. Beim direkten Auftragen auf die Bahn wird diese im Bereich des Dosiersystems von einer Gegenwalze 2 abgestützt. Ebenso kann das Rakel-Dosiersystem zum indirekten Dosieren eingesetzt werden, bei dem ein vordosierter Film von Beschichtungsmaterial zunächst auf eine Walze aufgetragen und anschließend von dieser an die Bahn abgegeben wird.The dosing systems shown in the figures are part of an apparatus for coating a paper or board web 1 with a coating color. When directly applied to the web this is supported in the dosing of a counter-roller 2. Likewise, the metering dosing system can be used for indirect dosing, in which a predosed film of coating material is first applied to a roller and then discharged from this to the web.

In Drehrichtung der Walze 2 vor dem Dosiersystem ist ein bekanntes Auftragssystem (Düsenauftragwerk, Walzenauftragwerk etc.) angeordnet, von dem Streichfarbe im Überschuss auf die Bahn 1 oder - beim indirekten Dosieren - auf die Walze 2 aufgetragen wird. Bei den Ausführungsbeispielen ist vor dem Dosiersystem eine Auftragkammer 15 angeordnet, die einlaufseitig von einer Überlaufplatte 16 begrenzt wird. In die Auftragkammer 15 mündet eine Zuführleitung 17, durch die Beschichtungsmaterial im Überschuss zugeführt wird. Der Überschuss läuft durch den Spalt zwischen der Überlaufplatte 16 und der Walze 2 ab.In the direction of rotation of the roller 2 before the metering a known application system (nozzle applicator, roller applicator, etc.) is arranged, is applied by the coating color in excess to the web 1 or - in the indirect dosing - on the roller 2. In the embodiments, an application chamber 15 is arranged in front of the dosing, which is bounded on the inlet side by an overflow plate 16. In the application chamber 15 opens a supply line 17, is supplied by the coating material in excess. The excess passes through the gap between the overflow plate 16 and the roller 2.

Das Rakel-Dosiersystem enthält als Dosierelement eine Rakelstange 3 die in einem zur Bahn 1 hin teilweise offenen Rakelbett 4 mittels eines Drehantriebs drehbar gelagert ist. Die Mantelfläche der Rakelstange 3 ist entweder glatt oder Umfangsrillen versehen. Ihr Durchmesser beträgt 6 mm - 40 mm, bevorzugt 9 mm - 25 mm. Die axiale Länge der Rakelstange 3 entspricht der Arbeitsbreite der Beschichtungsvorrichtung, die 10 m und mehr betragen kann. Bevorzugt ist die Rakelstange 3 aus Edelstahl gefertigt, und ihre Mantelfläche ist verschleißfest beschichtet, beispielsweise verchromt oder mit Keramik beschichtet.The metering metering system contains a metering element as a doctor bar 3 which is rotatably mounted in a direction towards the web 1 partially open doctor bed 4 by means of a rotary drive. The lateral surface of the doctor bar 3 is provided either smooth or circumferential grooves. Its diameter is 6 mm - 40 mm, preferably 9 mm - 25 mm. The axial length of the doctor bar 3 corresponds to the working width of the coating device, which may be 10 m or more. Preferably, the doctor bar 3 is made of stainless steel, and its outer surface is wear-resistant coated, for example, chrome-plated or coated with ceramic.

Das Rakelbett 4 ist vorzugsweise aus einem zumindest begrenzt elastischen Material gefertigt. Geeignete Materialien sind Elastomere, vorzugsweise Polyurethan oder Polyethylen. Die Härte des Materials ist so gewählt, dass sich das Bett 4 dichtend an die Rakelstange 3 anlegen kann, um ein Eindringen von Streichfarbe in das Bett 4 zu verhindern. Auf bekannte Weise weist das Rakelbett 4 eine Nut 5 auf, in die die Rakelstange 3 eingelegt wird, wobei das Rakelbett 4 die Rakelstange 3 in einem Winkelbereich von zumindest 180° umfasst, damit diese sicher gehalten wird. Das Rakelbett 4 ist über die Arbeitsbreite der Beschichtungsvorrichtung, also die Länge der Rakelstange 3 mit gleichbleibendem Querschnitt ausgestaltet. Es enthält zumindest einen zur Rakelstange 3 hin offenen Kanal 6, in den während des Betriebes Wasser als Schmier- und Reinigungsmittel eingeleitet wird.The doctor bed 4 is preferably made of an at least limited elastic material. Suitable materials are elastomers, preferably polyurethane or polyethylene. The hardness of the material is chosen so that the bed 4 can be sealingly applied to the doctor bar 3 in order to prevent penetration of coating color into the bed 4. In a known manner, the doctor bed 4 has a groove 5, in which the doctor bar 3 is inserted, the doctor bed 4, the doctor bar 3 in an angular range of at least 180 °, so that it is held securely. The doctor bed 4 is configured over the working width of the coating device, ie the length of the doctor bar 3 with a constant cross section. It contains at least one channel 6 which is open toward the doctor bar 3 and into which water is introduced as lubricant and cleaning agent during operation.

Das die Rakelstange 3 tragende Rakelbett 4 ist mit einem fußartigen Teil 8 im Rahmen 9 des Systems festgeklemmt. Bei der Ausführungsform nach Figur 1 ist das Rakelbett 4 nach unten zu einem Fuß 8 verlängert. Bei der Ausführungsform nach Figur 2 ist das Rakelbett 4 in einem Halteteil 10 gelagert, das ebenfalls einen sich nach unten erstreckenden Fuß 8 aufweist, mit dem es im Rahmen 9 fest geklemmt werden kann.The doctor blade bed 4 carrying the doctor bar 3 is clamped with a foot-like part 8 in the frame 9 of the system. In the embodiment according to FIG. 1 the doctor bed 4 is extended down to a foot 8. In the embodiment according to FIG. 2 is the doctor bed 4 in a holding part 10th mounted, which also has a downwardly extending foot 8, with which it can be firmly clamped in the frame 9.

Bei allen Ausführungsformen ist an der zur Rakelstange 3 abgewandten Rückseite des Rakelbetts 4 ein Abstützteil 7 angeordnet, da entweder das Rakelbett 4 direkt (Figur 1) oder das Halteteil 10 mit dem darin befindlichen Rakelbett 4 flächig an der Rückseite abstützt.In all embodiments, a support member 7 is arranged on the side facing away from the doctor bar 3 back of the doctor bed 4, since either the doctor bed 4 directly ( FIG. 1 ) or the holding part 10 is supported with the doctor bed 4 therein flat on the back.

Das Abstützteil 7 ist getrennt von dem Rakelbett 3 oder dem Halteteil 10 gestaltet, es stützt diese Teile nur an deren Rückseite ab. Somit kann das Abstützteil 7 getrennt von dem Rakelbett 4 / Halteteil 10 aus dem Dosiersystem ausgebaut und wieder eingebaut werden. An der Rückseite des Abstützteils 7 ist in Höhe der Rakelstange 3 ein Druckschlauch 11 befestigt, der dazu dient, den Anpressdruck der Rakelstange 3 einzustellen. Der Druckschlauch 11 stützt sich an der zum Rakelbett 4 abgewandten Seite an einer im Rahmen 9 gelagerten Profilleiste 21 ab. Die Profilleiste 21 kann mittels Stellschrauben 22 in Richtung zum Druckschlauch 11 hin und zurück verstellt werden. Falls eine Profilierung über die Maschinenbreite möglich sein soll, ist die Profilleiste 21 begrenzt elastisch, und es sind über die Maschinenbreite eine Reihe von Stellschrauben 22 mit Abstand voneinander angeordnet, um die Profilleiste 21 in einzelnen Bereichen gezielt zu verbiegen.The support member 7 is designed separately from the doctor bed 3 or the holding part 10, it supports these parts only at the back from. Thus, the support member 7 can be removed separately from the doctor bed 4 / holding part 10 removed from the dosing and reinstalled. At the back of the support member 7, a pressure hose 11 is fixed at the level of the doctor rod 3, which serves to adjust the contact pressure of the doctor rod 3. The pressure hose 11 is supported on the side facing away from the doctor bed 4 on a profile rail 21 mounted in the frame 9. The profile strip 21 can be adjusted by means of screws 22 toward the pressure hose 11 back and forth. If a profiling over the machine width should be possible, the profile strip 21 is limited elastic, and there are over the machine width a number of screws 22 spaced from each other to selectively bend the profile strip 21 in individual areas.

An dem Abstützteil 7 ist ein Klemmelement befestigt, das an der Rückseite des Abstützteils 7 angeordnet im Bereich des Fußes 12 wirkt. Es dient dazu, das Rakelbett 4 oder das Halteteil 10 gemeinsam mit dem Fuß 12 im Rahmen 9 des Systems festzuklemmen. Dazu wird beim Einsetzen der Teile der Fuß 8 des Rakelbetts 4 oder des Halteteils 10 zwischen dem Fuß 12 des Abstützteils und dem Rahmen 9 eingeklemmt. Bei den Ausführungsformen nach den Figuren 1 und 2 ist als Klemmelement an der Rückseite des Abstützelements 7 ein Klemmschlauch 14 befestigt. Durch Beaufschlagung des Klemmschlauchs 14 mit Luft drückt dieser gegen den Rahmen 9 und fixiert so die beiden Füße 8, 12.On the support part 7, a clamping element is attached, which is arranged on the back of the support member 7 in the region of the foot 12 acts. It serves to clamp the doctor bed 4 or the holding part 10 together with the foot 12 in the frame 9 of the system. For this purpose, when inserting the parts of the foot 8 of the doctor bed 4 or the holding part 10 between the foot 12 of the support member and the frame 9 is clamped. In the embodiments of the FIGS. 1 and 2 is attached as a clamping element on the back of the support member 7, a clamping hose 14. By applying the clamping hose 14 with air this presses against the frame 9 and thus fixes the two feet 8, 12th

Bei der Ausführungsform nach Figur 3 wird der Fuß 12 des Abstützteils 7 mit dem Fuß 8 des Rakelbetts 4 mechanisch festgeklemmt und verriegelt. Dazu weist der Fuß 12 einen keilförmigen, sich nach unten verbreiternden Querschnitt auf. Als Klemmelement ist an seiner Rückseite eine Klemmstange 18 vertikal beweglich angeordnet, die sich bei der Bewegung nach unten zwischen dem Fuß 12 und dem Rahmen 9 festklemmt. Die Klemmstange 18 ist an ihrer oberen Kante an mehreren dünnen Hebeblechen 19 befestigt, die vertikal beweglich durch einen senkrechten Spalt 20 im oberen Teil des Abstützteils 7 bewegbar sind. Mittels der Hebebleche 19 lässt sich so die Klemmstange 18 zum Klemmen und Verriegeln absenken und zum Lösen und Entriegeln anheben. Das obere Ende der Hebebleche 19 ist an der Oberseite des Abstützteils 7 befestigt, damit es mit der an ihm befestigten Klemmstange 18 gemeinsam aus dem Rahmen 9 ausgebaut werden kann. Anstelle der Hebebleche 19 kann die Klemmstange 18 auch an einem oder mehreren Hebedrähten befestigt sein, die dann ebenfalls vertikal bewegbar an dem Abstützteil 7 befestigt sind.In the embodiment according to FIG. 3 the foot 12 of the support member 7 is mechanically clamped and locked with the foot 8 of the doctor bed 4. For this purpose, the foot 12 has a wedge-shaped cross-section widening downwards. As a clamping element, a clamping rod 18 is arranged vertically movable on its rear side, which clamps in the movement down between the foot 12 and the frame 9. The clamping rod 18 is secured at its upper edge to a plurality of thin lifting plates 19 which are vertically movable by a vertical gap 20 in the upper part of the support member 7 movable. By means of the lifting plates 19 can be so lower the clamping bar 18 for clamping and locking and lift to release and unlock. The upper end of the lifting plate 19 is attached to the top of the support member 7 so that it can be removed together with the clamp rod 18 attached to it from the frame 9. Instead of the lifting plates 19, the clamping rod 18 may also be attached to one or more lifting wires, which are then also mounted vertically movable on the support member 7.

Der Druckschlauch 11 stützt sich zum Andrücken der Rakelstange 3 ebenfalls an dem Rahmen 9 ab. Damit beim Andrücken die oberen Teile 3, 4, 7, 10 unabhängig von den festgeklemmten Füßen 8, 9 begrenzt kippen können, enthält das Abstützteil 7 zwischen der Befestigung des Andruckschlauchs 11 und dem Wirkungsort des Klemmelements 14,18 eine als Gelenkstelle wirkende Schwachstelle 13. Bei den Ausführungsformen nach den Figuren 1 und 2 ist der Wirkungsort des Klemmelements die Stelle der Befestigung des Klemmschlauchs 14. Das Rakelbett 4 nach den Figuren 1 und 3, sowie das Halteteil 10 nach Figur 2 sind im Bereich der Schwachstelle 13 ebenfalls mit verringertem Durchmesser gestaltet, so dass die oberen Teile kippen können.The pressure hose 11 is also supported on the frame 9 for pressing the doctor rod 3. Thus, when pressing the upper parts 3, 4, 7, 10 can tilt limited, regardless of the clamped feet 8, 9, the support part 7 between the attachment of the pressure hose 11 and the site of action of the clamping element 14,18 a weak point acting as a hinge point 13th In the embodiments of the FIGS. 1 and 2 the point of action of the clamping element is the point of attachment of the clamping tube 14. The doctor bed 4 according to the FIGS. 1 and 3 , as well as the holding part 10 after FIG. 2 are also designed with a reduced diameter in the area of the weak point 13, so that the upper parts can tilt.

Claims (6)

  1. Doctor metering system for an apparatus for coating material webs (1), in particular paper or cardboard webs, having a doctor rod (3) as metering element, which is mounted in a groove of a doctor bed (4) which is fastened removably in the frame of the system, a supporting part (7) being arranged on the rear side of the doctor bed (4) which faces away from the doctor rod (3), which supporting part (7)
    - supports the doctor bed (4) or a holding part (10) which holds the doctor bed (4), on the rear side,
    - is designed such that it can be removed from the metering system separately from the doctor bed (4) or the holding part (10) which holds the doctor bed (4), and
    - on the rear side of which, which faces away from the doctor bed (4), a pressure hose (11) is fastened at the level of the doctor rod (3) and a clamping element (14, 18) is arranged which acts in the region of the base (12) of the supporting part (7),
    characterized in that the doctor bed (4) is extended downwards to a base (8) which, together with the base (12) of the supporting part (7), can be clamped fixedly in the frame (9) of the system by means of the clamping element (14, 18).
  2. Doctor metering system according to Claim 1, characterized in that the doctor bed (4) is mounted in a holding part (10) which is supported on its rear side by the supporting part (7) and has a downwardly extending base (8) which, together with the base (12) of the supporting part (7), can be clamped fixedly in the frame (9) of the system by means of the clamping element (14, 18).
  3. Doctor metering system according to Claim 1 or 2, characterized in that the clamping element is a clamping hose (14) which is fastened to the rear side of the supporting part (7).
  4. Doctor metering system according to one of Claims 1 to 3, characterized in that the base (12) of the supporting part (7) has a wedge-shaped, downwardly widening cross section, and a clamping rod (18) is arranged on its rear side as a clamping element such that it can be moved vertically, which clamping rod (18) is clamped fixedly between the base (12) and the frame (9) during the downward movement.
  5. Doctor metering system according to Claim 4, characterized in that the clamping rod (18) is fastened to the lower edge of a thin lifting plate (19) or a lifting wire which is fastened to the upper side of the supporting part (7) such that it can be moved vertically.
  6. Doctor metering system according to one of Claims 1 to 5, characterized in that, between the active location of the clamping element (14, 17) and the fastening means of the pressing hose (11), the supporting part (7) comprises a weak point (13) which acts as a hinge point and makes a tilting movement of the upper part which is brought about by the pressure hose (11) possible, in order to press on the doctor bed (4) independently of the fixedly clamped base (12).
EP12178051.4A 2011-09-13 2012-07-26 Squeegee metering system Not-in-force EP2570194B1 (en)

Applications Claiming Priority (1)

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DE102011112956A DE102011112956A1 (en) 2011-09-13 2011-09-13 Squeegee metering

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EP2570194B1 true EP2570194B1 (en) 2016-10-12

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