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EP1748852A1 - Doctor blade holder - Google Patents

Doctor blade holder

Info

Publication number
EP1748852A1
EP1748852A1 EP05733530A EP05733530A EP1748852A1 EP 1748852 A1 EP1748852 A1 EP 1748852A1 EP 05733530 A EP05733530 A EP 05733530A EP 05733530 A EP05733530 A EP 05733530A EP 1748852 A1 EP1748852 A1 EP 1748852A1
Authority
EP
European Patent Office
Prior art keywords
doctor
bed according
doctor bed
respective insert
insert part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05733530A
Other languages
German (de)
French (fr)
Other versions
EP1748852B1 (en
Inventor
Christoph Henninger
Martin Schaubmaier
Michael Heitzinger
Rüdiger Keinberger
Horst Kaipf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1748852A1 publication Critical patent/EP1748852A1/en
Application granted granted Critical
Publication of EP1748852B1 publication Critical patent/EP1748852B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/044—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for holding the blades

Definitions

  • the invention relates to a doctor bed, designed as a profile strip with an axially continuous groove for receiving a rotatable doctor rod, which can be pressed against a running surface and metered and / or leveled liquid to pasty medium applied to the running surface, the running surface at direct application of the medium is one side of a paper, cardboard or other fibrous web and, with indirect application, is the surface of a transfer element which transfers the medium to the fibrous web.
  • Doctor beds are used for the storage and support of circular cylindrical doctor rods, which are used for dosing and / or leveling a liquid to pasty medium applied to a running surface within so-called coating machines.
  • the doctor blades are usually made of a homogeneous material. Very long and slender cylindrical doctor rods are to be held at low to high speeds, while they apply, strip or only distribute the coating material as evenly as possible. The use of such doctor blades is susceptible to wear. The replacement of the very expensive rods is then associated with labor and downtime. The doctor beds must also be replaced regularly due to wear. The stability of the doctor bed is thus limited, which should press the rod very precisely and evenly over its entire length.
  • the doctor bed requires its own elasticity and at the same time the best possible lubricity and abrasion resistance.
  • the doctor bed is supplied with water under appropriate pressure via internal channels or profile chambers, so that the Doctor rod receives a floating storage in the doctor bed.
  • modern doctor blades provided with a profiling which create a better application dosage, wear the doctor beds particularly in areas with high support pressure.
  • DE 101 20 786 A1 discloses a doctor bed for pressing a rotating doctor rod against a roller, such as an applicator roller or coating roller in paper machines, the doctor bed being designed as a profiled strip which supports the doctor rod elastically in the pressing direction.
  • the doctor bed consists of an elastomeric polyurethane material which is mixed with an amount of at least 3 percent by weight with ultra-high molecular weight polyethylene.
  • the admixture of an ultra-high-molecular polyethylene is intended to achieve longer service lives in terms of lubricity and abrasion resistance.
  • DE 43 34 555 A1 describes a holder for a doctor rod which has a doctor bed which holds the doctor rod and is mounted so that it can move in the direction of the holder opening in a holder which is open on one side.
  • An elastic pressure hose which presses in the direction of the holder opening, is arranged between the holder and the doctor bed.
  • a further pressure hose pushing in the opposite direction is provided. Due to the respective loading of the pressure hoses, the cross profile should be adjustable independently of the contact pressure with a finely adjustable profiling device.
  • problems with an uneven load can result in increased wear due to partial deformation, for example in the edge area of the paper web, due to insufficient lubrication, fiber deposits from the paper web edge, unfavorable friction conditions in the transition from coating material to edge moistening or partial dry running.
  • the invention is based on the object of developing a doctor bed in such a way that it has wear that is uniform over its entire length.
  • a doctor bed designed as a profile strip with a groove running through in the axial direction for supporting a doctor rod in the pressing direction, the doctor bed being formed in sections in the axial direction by at least one insert which is more dimensionally stable in relation to the other material.
  • the invention proposes a relatively short component, which is inserted in each case in the critical area and thereby maintains the inherent elasticity of the entire doctor device required for operation.
  • a doctor rod arranged in the groove is flexibly supported in the pressing direction, that is to say in the direction of the running substrate to be coated, for example an application roller of a coating machine.
  • One insert part or several insert parts are integrated in the doctor bed along the axial direction and in particular are arranged at places where particularly high wear occurs with conventional doctor beds.
  • a particular advantage is the low abrasion or wear achieved by the solution according to the invention and a low coefficient of friction of the materials used, which lead to an increased service life of the doctor bed. There may be several critical zones with increased wear.
  • a particular advantage of the invention results from the use of materials which are matched to one another in terms of wear behavior, for example with rubber-elastic materials as the base material in conjunction with appropriately dimensionally and abrasion-resistant insert parts.
  • the doctor bed thus has wear that is uniform over its entire length.
  • an insert - also known as an insert - heat-resistant, dimensionally stable, abrasion-resistant and low-friction materials that are coordinated with one another at low cost are considered.
  • An advantageous embodiment of the invention provides that a plurality of insert parts are located in the outer area in the axial direction.
  • an insert part is arranged in a critical area in order to compensate for a partial deformation, for example in the edge area of a paper web, due to insufficient lubrication, fiber deposits or unfavorable friction conditions. This eliminates the problems mentioned at the outset, which result from an unequal load.
  • transitions of the individual material combinations which can have very different mechanical properties in the basic material of the doctor bed and an insert, also play a special role.
  • the component geometry of the respective insert part forms a homogeneous transition of the materials used for an insert part and the remaining profile strip. In this way, a homogeneous and soft transition of different materials can be created.
  • the common contact surfaces of the respective insert part with the surrounding material are advantageously arranged essentially at an angle of 45 ° -90 °, preferably at 70 ° -90 °, with respect to the axial direction.
  • the respective insert part is heat-resistant.
  • the doctor beds assume the guiding and supporting function for the rotatably mounted doctor bars. These should be guided through material that is as slippery as possible, but which should still meet further requirements with regard to a sufficiently long service life of the device.
  • the respective insert part is wear-resistant.
  • the respective insert part advantageously consists of thermoplastic.
  • An insert made of polyethylene (PE) or high-strength polyether ether ketone (PEEK) is particularly advantageous due to the correspondingly high toughness of the materials. In this way, a homogeneous transition over the entire length of the doctor bed is already created with the rest of the base material with regard to the elasticity of the doctor bed by the choice of material.
  • the thermoplastic is preferably selected so that it still remains more rigid than the base material when heated.
  • the respective insert part can advantageously also consist of polymers, for example of polyurethane (PU) or polyamide (PA).
  • PU polyurethane
  • PA polyamide
  • the elastomer, such as polyurethane (PU) is particularly suitable for this purpose, since mechanical properties can be elastic until hard and abrasion resistant. In contrast to its abrasion resistance, polyamide (PA) is comparatively hard.
  • the respective insert part can advantageously consist of a composite material.
  • the insert can advantageously be constructed from a composite of rubber and graphite.
  • the respective insert part can advantageously also consist of ceramic. This creates a particularly dimensionally and wear-resistant insert in the doctor bed.
  • the respective insert part can advantageously also consist of metal.
  • Metals made of a copper alloy, for example bronze, are particularly suitable for this.
  • Bronze as a material is also particularly resistant to corrosion.
  • the respective insert part is form-fitting, glued, screwed, riveted, pressed in, cast in or welded in.
  • the most favorable joining method can be selected with regard to the mechanical stress on the doctor bed during operation.
  • FIG. 2 shows a view of a doctor bed with a centrally arranged Insert part
  • Fig. 3 is a view of a doctor bed with an insert part held by positive locking.
  • FIG. 1 shows a view of a doctor device according to the invention with a doctor bed 1 and a doctor rod 2 with an insert part 4 arranged in the edge region.
  • the doctor rod 2 is rotatably supported in the axially extending groove 3 in the doctor bed 1.
  • a relatively short insert part 4 is arranged in the profile strip, seen in the axial direction, in order to maintain the required inherent elasticity of the entire doctor device. In this case, the component extends over the entire width of the doctor bed 1.
  • FIG. 2 shows a doctor device with a doctor bed 1 with a centrally arranged insert 4.
  • one or more insert parts 4 integrated in the doctor bed 1 along the axial direction can be arranged at places where particularly high mechanical loads occur in conventional doctor beds.
  • the insert part 4 extends over the entire width of the doctor bed 1.
  • Fig. 3 shows a view of a doctor device according to the invention with a doctor bed 1 with a centrally arranged insert 4, which is held by positive locking.
  • the insert part 4 extends only over part of the width of the doctor blade and is already sufficiently fixed due to the positive fit alone.
  • the dovetail shape is particularly advantageous.
  • Other geometries, for example omega-shaped, are also conceivable. LIST OF REFERENCE NUMBERS

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Ladders (AREA)
  • Soil Working Implements (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

The invention relates to a doctor bed, formed as a profiled strip having a continuous groove in the axial direction to hold a rotatable metering rod, which can be pressed against a moving surface and meters and/or evens out liquid to pasty medium applied to the moving surface, the moving surface in the case of direct application of the medium being one side of a paper, board or other fibrous web and in the case of indirect application being the surface of a transfer element which transfers the medium to the fibrous web.

Description

Rakelbett doctor bed
Die Erfindung betrifft ein Rakelbett, ausgebildet als Profilleiste mit einer in axialer Richtung durchlaufenden Nut zur Aufnahme eines drehbaren Rakelstabs, der gegen eine laufende Oberfläche anpressbar ist und auf die laufende Oberfläche aufgebrachtes flüssiges bis pastöses Medium dosiert und/oder egalisiert, wobei die laufende Oberfläche bei direktem Auftrag des Mediums eine Seite einer Papier-, Karton- oder anderen Faserstoffbahn ist und bei indirektem Auftrag die Oberfläche eines Übertragungselementes ist, welches das Medium an die Faserstoffbahn überträgt.The invention relates to a doctor bed, designed as a profile strip with an axially continuous groove for receiving a rotatable doctor rod, which can be pressed against a running surface and metered and / or leveled liquid to pasty medium applied to the running surface, the running surface at direct application of the medium is one side of a paper, cardboard or other fibrous web and, with indirect application, is the surface of a transfer element which transfers the medium to the fibrous web.
Rakelbetten dienen der Lagerung und Abstützung von kreiszylindrischen Rakelstäben, die zum Dosieren und/oder Egalisieren eines auf einen laufenden Untergrund aufgebrachten flüssigen bis pastösen Mediums innerhalb von sogenannten Streichmaschinen Verwendung finden. Die Rakelstäbe werden üblicherweise aus einem homogenen Werkstoff hergestellt. Dabei sind sehr lange und schlanke zylindrische Rakelstäbe bei geringen bis hohen Drehzahlen zu haltern, während diese das Beschichtungsmaterial möglichst gleichmäßig aufbringen, abstreifen oder nur verteilen. Der Einsatz solcher Rakelstäbe ist verschleißträchtig. Das Auswechseln der sehr teuren Stäbe ist dann mit Arbeitsaufwand und Betriebsausfall verbunden. Auch die Rakelbetten sind aufgrund von Verschleiß regelmäßig zu erneuern. Die Standfestigkeit des Rakelbetts ist somit begrenzt, welches den Stab über seine gesamte Länge hochgenau und gleichmäßig andrücken soll. Dazu benötigt das Rakelbett eine Eigenelastizität und gleichzeitig eine möglichst gute Gleitfähigkeit und Abriebfestigkeit. Üblicherweise wird das Rakelbett über innere Kanäle oder Profilkammern mit Wasser unter entsprechendem Druck beaufschlagt, so dass der Rakelstab eine schwimmende Lagerung im Rakelbett erhält. Insbesondere moderne, mit einer Profilierung versehene Rakelstäbe, die eine bessere Auftragsdosierung schaffen, nutzen die Rakelbetten in Bereichen mit hohem Abstützuπgsdruck besonders ab.Doctor beds are used for the storage and support of circular cylindrical doctor rods, which are used for dosing and / or leveling a liquid to pasty medium applied to a running surface within so-called coating machines. The doctor blades are usually made of a homogeneous material. Very long and slender cylindrical doctor rods are to be held at low to high speeds, while they apply, strip or only distribute the coating material as evenly as possible. The use of such doctor blades is susceptible to wear. The replacement of the very expensive rods is then associated with labor and downtime. The doctor beds must also be replaced regularly due to wear. The stability of the doctor bed is thus limited, which should press the rod very precisely and evenly over its entire length. For this purpose, the doctor bed requires its own elasticity and at the same time the best possible lubricity and abrasion resistance. Usually, the doctor bed is supplied with water under appropriate pressure via internal channels or profile chambers, so that the Doctor rod receives a floating storage in the doctor bed. In particular modern doctor blades provided with a profiling, which create a better application dosage, wear the doctor beds particularly in areas with high support pressure.
Aus der DE 101 20 786 A1 ist ein Rakelbett zum Andruck eines rotierenden Rakelstabs gegen eine Walze bekannt, wie etwa eine Auftragswalze oder Beschichtungswalze in Papiermaschinen, wobei das Rakelbett als Profilleiste ausgebildet ist, die den Rakelstab elastisch in Andruckrichtung abstützt. Das Rakelbett besteht aus einem elastomeren Polyurethanmaterial, das mit einem Anteil von zumindest 3 Gewichtsprozenten mit ultrahochmolekularem Polyäthylen gemischt ist. Durch die Beimischung eines ultrahochmolekularen Polyäthylens sollen hinsichtlich der Gleitfähigkeit und Abriebfestigkeit längere Standzeiten erzielt werden.DE 101 20 786 A1 discloses a doctor bed for pressing a rotating doctor rod against a roller, such as an applicator roller or coating roller in paper machines, the doctor bed being designed as a profiled strip which supports the doctor rod elastically in the pressing direction. The doctor bed consists of an elastomeric polyurethane material which is mixed with an amount of at least 3 percent by weight with ultra-high molecular weight polyethylene. The admixture of an ultra-high-molecular polyethylene is intended to achieve longer service lives in terms of lubricity and abrasion resistance.
Des Weiteren ist in der DE 43 34 555 A1 eine Halterung für eine Rakelstange beschrieben, welche ein die Rakelstange haltendes Rakelbett aufweist, das in einem an einer Seite offenen Halter in Richtung der Halteroffnung bewegbar gelagert ist. Zwischen Halter und Rakelbett ist ein elastischer, in Richtung der Halteröffnung drückender Druckschlauch angeordnet. Um einen in seiner Weite präzisen und über die Arbeitsbreite gleichmäßigen Spalt zwischen Rakelstange und einer Walze einstellen zu können, ist ein weiterer, in Gegenrichtung drückender Druckschlauch vorgesehen. Durch die jeweilige Beaufschlagung der Druckschläuche soll sich das Querprofil unabhängig vom Anpressdruck mit einer fein einstellbaren Profiliereinrichtung einstellen lassen.Furthermore, DE 43 34 555 A1 describes a holder for a doctor rod which has a doctor bed which holds the doctor rod and is mounted so that it can move in the direction of the holder opening in a holder which is open on one side. An elastic pressure hose, which presses in the direction of the holder opening, is arranged between the holder and the doctor bed. In order to be able to set a gap between the doctor rod and a roller that is precise in its width and uniform over the working width, a further pressure hose pushing in the opposite direction is provided. Due to the respective loading of the pressure hoses, the cross profile should be adjustable independently of the contact pressure with a finely adjustable profiling device.
Bei den vorgeschlagenen Lösungen treten jedoch über die gesamte Länge einer Rakelvorrichtung zonar unterschiedliche Verschleißerscheinungen auf oder stellen bezüglich des Anpressdrucks zwar steuerbare, technisch jedoch sehr aufwändige Lösungen dar.In the proposed solutions, however, different signs of wear occur over the entire length of a doctor device or represent controllable but technically very complex solutions with regard to the contact pressure.
Des Weiteren können sich Probleme bei einer ungleichen Belastung dadurch ergeben, dass sich ein erhöhter Verschleiß durch eine partielle Deformation, beispielsweise im Randbereich der Papierbahn, aufgrund ungenügender Schmierung, Faserablagerungen vom Papierbahnrand, ungünstiger Reibungsverhältnisse im Übergang von Beschichtungsmaterial zur Randbefeuchtung oder partiellem Trockenlauf einstellt.Furthermore, problems with an uneven load can result result in increased wear due to partial deformation, for example in the edge area of the paper web, due to insufficient lubrication, fiber deposits from the paper web edge, unfavorable friction conditions in the transition from coating material to edge moistening or partial dry running.
Der Erfindung liegt die Aufgabe zugrunde, ein Rakelbett so weiterzubilden, dass es über seine gesamte Länge eine im Verschleißverhalten gleichmäßige Abnutzung aufweist.The invention is based on the object of developing a doctor bed in such a way that it has wear that is uniform over its entire length.
Diese Aufgabe wird durch ein Rakelbett nach Anspruch 1 gelöst.This object is achieved by a doctor bed according to claim 1.
Erfindungsgemäß ist ein Rakelbett vorgesehen, ausgebildet als Profilleiste mit einer in axialer Richtung durchlaufenden Nut zur Abstützung eines Rakelstabs in Andruckrichtung, wobei das Rakelbett abschnittsweise in axialer Richtung durch wenigstens ein Einsatzteil gebildet ist, das in Bezug zum übrigen Werkstoff formbeständiger ist.According to the invention, a doctor bed is provided, designed as a profile strip with a groove running through in the axial direction for supporting a doctor rod in the pressing direction, the doctor bed being formed in sections in the axial direction by at least one insert which is more dimensionally stable in relation to the other material.
Die Erfindung schlägt ein relativ kurzes' Bauteil vor, das jeweils im kritischen Bereich eingefügt ist und dabei die für einen Betrieb erforderliche Eigenelastizität der gesamten Rakelvorrichtung bewahrt.The invention proposes a relatively short component, which is inserted in each case in the critical area and thereby maintains the inherent elasticity of the entire doctor device required for operation.
Durch die entsprechende Eigenelastizität wird ein in der Nut angeordneter Rakelstab in Andruckrichtung, also in Richtung des zu beschichtenden laufenden Untergrundes, beispielsweise einer Auftragswalze einer Streichmaschine, flexibel abgestützt. Ein Einsatzteil ist oder mehrere Einsatzteile sind entlang der axialen Richtung im Rakelbett eingebunden und insbesondere an Stellen angeordnet, an denen bei herkömmlichen Rakelbetten besonders hoher Verschleiß auftritt. Ein besonderer Vorteil ist der durch die erfindungsgemäße Lösung erzielte geringe Abrieb oder Verschleiß und ein niedriger Reibungskoeffizient der verwendeten Materialien, die zu einer erhöhten Standzeit des Rakelbetts führen. Es können dabei mehrere kritische Zonen mit erhöhtem Verschleiß vorhanden sein. Ein besonderer Vorteil der Erfindung ergibt sich durch die Verwendung der im Verschleißverhalten aufeinander abgestimmten Werkstoffe, beispielsweise mit gummielastischen Werkstoffen als Grundmaterial in Verbindung mit entsprechend form- und abriebbeständigen Einsatzteilen. Damit weist das Rakelbett über seine gesamte Länge eine im Verschleißverhalten gleichmäßige Abnutzung auf. Für ein Einsatzteil - auch als Insert bezeichnet - kommen günstig aufeinander abgestimmte hitzebeständige, formbeständige, abriebbeständige und reibungsarme Werkstoffe in Betracht.Due to the corresponding inherent elasticity, a doctor rod arranged in the groove is flexibly supported in the pressing direction, that is to say in the direction of the running substrate to be coated, for example an application roller of a coating machine. One insert part or several insert parts are integrated in the doctor bed along the axial direction and in particular are arranged at places where particularly high wear occurs with conventional doctor beds. A particular advantage is the low abrasion or wear achieved by the solution according to the invention and a low coefficient of friction of the materials used, which lead to an increased service life of the doctor bed. There may be several critical zones with increased wear. A particular advantage of the invention results from the use of materials which are matched to one another in terms of wear behavior, for example with rubber-elastic materials as the base material in conjunction with appropriately dimensionally and abrasion-resistant insert parts. The doctor bed thus has wear that is uniform over its entire length. For an insert - also known as an insert - heat-resistant, dimensionally stable, abrasion-resistant and low-friction materials that are coordinated with one another at low cost are considered.
Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, dass sich mehrere Einsatzteile in axialer Richtung im Außenbereich befinden. Es ist aber auch möglich, dass nur ein Einsatzteil bevorzugt in der Mitte angeordnet ist und/oder in der Mitte angeordnet sind. Partiell wird also ein Einsatzteil in einem kritischen Bereich angeordnet, um eine partielle Deformation, beispielsweise im Randbereich einer Papierbahn, aufgrund ungenügender Schmierung, Faserablagerungen oder ungünstige Reibungsverhältnisse auszugleichen. Hierdurch werden die eingangs erwähnten Probleme, die sich aus einer ungleichen Belastung ergeben behoben.An advantageous embodiment of the invention provides that a plurality of insert parts are located in the outer area in the axial direction. However, it is also possible for only one insert part to be preferably arranged in the middle and / or to be arranged in the middle. Partially, therefore, an insert part is arranged in a critical area in order to compensate for a partial deformation, for example in the edge area of a paper web, due to insufficient lubrication, fiber deposits or unfavorable friction conditions. This eliminates the problems mentioned at the outset, which result from an unequal load.
Eine besondere Rolle spielen auch die Übergänge der einzelnen Materialkombinationen, die im Grundmaterial des Rakelbetts und einem Einsatzteil stark unterschiedliche mechanische Eigenschaften aufweisen können. In bevorzugter Ausführungsform wird durch die Bauteilgeometrie des jeweiligen Einsatzteils ein homogener Übergang der für ein Einsatzteil und der übrigen Profilleiste verwendeten Werkstoffe ausgebildet. Hierdurch kann ein homogener und weicher Übergang unterschiedlicher Materialien geschaffen werden.The transitions of the individual material combinations, which can have very different mechanical properties in the basic material of the doctor bed and an insert, also play a special role. In a preferred embodiment, the component geometry of the respective insert part forms a homogeneous transition of the materials used for an insert part and the remaining profile strip. In this way, a homogeneous and soft transition of different materials can be created.
Vorteilhafterweise sind die gemeinsamen Berührungsflächen des jeweiligen Einsatzteils mit dem umgebenden Werkstoff im Wesentlichen unter einem Winkel von 45°-90°, bevorzugt unter 70°-90°, bezüglich der axialen Richtung angeordnet.The common contact surfaces of the respective insert part with the surrounding material are advantageously arranged essentially at an angle of 45 ° -90 °, preferably at 70 ° -90 °, with respect to the axial direction.
Diese Anordnung ergibt einen harmonischeren Übergang der unterschiedlichen Werkstoffe. Im Wesentlichen bedeutet in diesem Zusammenhang, dass aus geometrischen Gründen bei der konstruktiven Auslegung der Einsatzteile natürlich auch andere Flächenorientierungen auftreten können. Diese Orientierungen sollen jedoch einen untergeordneten Einfluss auf die Elastizität des Rakelbetts und insbesondere auf die Art und Weise eines fließenden Übergangs der Krafteinleitung auf einen Rakelstab besitzen.This arrangement results in a more harmonious transition of the different ones Materials. In this context, this essentially means that, for geometrical reasons, other surface orientations can of course also occur when constructing the insert parts. However, these orientations are said to have a subordinate influence on the elasticity of the doctor bed and in particular on the manner in which the force application flows smoothly onto a doctor rod.
Beim Auftragen eines flüssigen oder pastösen Mediums, beispielsweise auf eine laufende Materialbahn aus Papier oder Karton, können beträchtliche Temperaturen auftreten, die auch Rakelvorrichtungen in ihrer Funktionsweise beeinträchtigen können. In bevorzugter Ausführungsform ist dazu das jeweilige Einsatzteil hitzebeständig.When applying a liquid or pasty medium, for example on a running material web made of paper or cardboard, considerable temperatures can occur which can also impair the functioning of squeegee devices. In a preferred embodiment, the respective insert part is heat-resistant.
Beispielsweise bei Rollrakeleinrichtungen übernehmen die Rakelbetten die Fuhrungs- und Stützfunktion für die drehbar gelagerten Rakelstäbe. Diese sollten durch möglichst gleitfähiges Material geführt werden, das jedoch noch weitere Anforderungen bezüglich ausreichend langer Standzeiten der Vorrichtung erfüllen soll. In bevorzugter Ausführungsform ist dazu das jeweilige Einsatzteil verschleißbeständig.For example, in the case of roll doctor devices, the doctor beds assume the guiding and supporting function for the rotatably mounted doctor bars. These should be guided through material that is as slippery as possible, but which should still meet further requirements with regard to a sufficiently long service life of the device. In a preferred embodiment, the respective insert part is wear-resistant.
Vorteilhafterweise besteht das jeweilige Einsatzteil aus Thermoplast. Insbesondere vorteilhaft ist ein Einsatzteil aus Polyethylen (PE) oder hochfestem Polyetheretherketon (PEEK) durch eine entsprechend hohe Zähigkeit der Materialien. Hierdurch wird zum übrigen Grundmaterial bezüglich der Elastizität des Rakelbetts bereits durch die Werkstoffauswahl ein homogener Übergang über die gesamte Länge des Rakelbetts geschaffen. Der Thermoplast wird jedoch bevorzugt so ausgewählt, dass dieser bei Erwärmung dennoch starrer bleibt, als das Grundmaterial.The respective insert part advantageously consists of thermoplastic. An insert made of polyethylene (PE) or high-strength polyether ether ketone (PEEK) is particularly advantageous due to the correspondingly high toughness of the materials. In this way, a homogeneous transition over the entire length of the doctor bed is already created with the rest of the base material with regard to the elasticity of the doctor bed by the choice of material. However, the thermoplastic is preferably selected so that it still remains more rigid than the base material when heated.
Alternativ kann vorteilhafterweise auch das jeweilige Einsatzteil aus Polymeren bestehen, beispielsweise aus Polyurethan (PU) oder Polyamid (PA). Hierzu eignet sich insbesondere das Elastomer wie Polyurethan(PU), da es bezüglich seiner mechanischen Eigenschaften gummielastisch bis hart sein kann und dabei abriebfest ist. Polyamid (PA) ist dagegen außer seiner Abriebfestigkeit vergleichsweise hart.Alternatively, the respective insert part can advantageously also consist of polymers, for example of polyurethane (PU) or polyamide (PA). The elastomer, such as polyurethane (PU), is particularly suitable for this purpose, since mechanical properties can be elastic until hard and abrasion resistant. In contrast to its abrasion resistance, polyamide (PA) is comparatively hard.
Alternativ kann vorteilhafterweise das jeweilige Einsatzteil aus einem Werkstoffverbund bestehen. Insbesondere kann vorteilhafterweise das Einsatzteil aus einem Werkstoffverbund aus Gummi und Graphit aufgebaut sein.Alternatively, the respective insert part can advantageously consist of a composite material. In particular, the insert can advantageously be constructed from a composite of rubber and graphite.
Alternativ kann vorteilhafterweise auch das jeweilige Einsatzteil aus Keramik bestehen. Hierdurch wird ein besonders form- und verschleißbeständiges Einsatzteil im Rakelbett geschaffen.Alternatively, the respective insert part can advantageously also consist of ceramic. This creates a particularly dimensionally and wear-resistant insert in the doctor bed.
Alternativ kann vorteilhafterweise auch das jeweilige Einsatzteil aus Metall bestehen. Metalle aus einer Kupferlegierung, beispielsweise aus Bronze, eignen sich hierzu besonders gut. Bronze als Werkstoff zeichnet sich auch als besonders korrosionsbeständig aus.Alternatively, the respective insert part can advantageously also consist of metal. Metals made of a copper alloy, for example bronze, are particularly suitable for this. Bronze as a material is also particularly resistant to corrosion.
In bevorzugter Ausführungsform ist das jeweilige Einsatzteil formschlüssig, geklebt, geschraubt, genietet, eingepresst, eingegossen oder eingeschweißt. Je nach Einsatzbereich kann das jeweils günstige Fügeverfahren im Hinblick auf die mechanische Beanspruchung des Rakelbetts im Betrieb ausgewählt werden.In a preferred embodiment, the respective insert part is form-fitting, glued, screwed, riveted, pressed in, cast in or welded in. Depending on the area of application, the most favorable joining method can be selected with regard to the mechanical stress on the doctor bed during operation.
Weitere Vorteile, Besonderheiten und zweckmäßige Weiterbildungen der Erfindung ergeben sich aus den weiteren Unteransprüchen oder deren Unterkombinationen.Further advantages, special features and expedient developments of the invention result from the further subclaims or their subcombinations.
Nachfolgend wird die Erfindung anhand der Zeichnungen weiter erläutert. Im Einzelnen zeigt die schematische Darstellung in:The invention is explained in more detail below with reference to the drawings. The schematic diagram shows in detail:
Fig. 1 eine Ansicht eines Rakelbetts mit Einsatzteil am Rand,1 is a view of a doctor bed with insert at the edge,
Fig.2 eine Ansicht eines Rakelbetts mit einem mittig angeordneten Einsatzteil, und2 shows a view of a doctor bed with a centrally arranged Insert part, and
Fig. 3 eine Ansicht eines Rakelbetts mit einem durch Formschluss gehalterten Einsatzteil.Fig. 3 is a view of a doctor bed with an insert part held by positive locking.
Die in den Figuren gleichen Bezugsziffern bezeichnen gleiche oder gleich wirkende Elemente.The same reference numerals in the figures designate elements that are the same or have the same effect.
Fig. 1 zeigt eine Ansicht einer erfindungsgemäßen Rakelvorrichtung mit einem Rakelbett 1 und ein Rakelstab 2 mit einem im Randbereich angeordneten Einsatzteil 4. Der Rakelstab 2 wird in der axial verlaufenden Nut 3 im Rakelbett 1 drehbar gelagert. Zur Abstützung eines Rakelstabs 2 in Andruckrichtung ist in der Profilleiste in axialer Richtung gesehen ein relativ kurzes Einsatzteil 4 angeordnet, um die erforderliche Eigenelastizität der gesamten Rakelvorrichtung zu bewahren. Das Bauteil erstreckt sich in diesem Falle über die ganze Breite des Rakelbetts 1.1 shows a view of a doctor device according to the invention with a doctor bed 1 and a doctor rod 2 with an insert part 4 arranged in the edge region. The doctor rod 2 is rotatably supported in the axially extending groove 3 in the doctor bed 1. To support a doctor rod 2 in the pressing direction, a relatively short insert part 4 is arranged in the profile strip, seen in the axial direction, in order to maintain the required inherent elasticity of the entire doctor device. In this case, the component extends over the entire width of the doctor bed 1.
In Fig. 2 ist eine Rakelvorrichtung mit einem Rakelbett 1 mit einem mittig angeordneten Einsatzteil 4 gezeigt. So können ein oder mehrere entlang der axialen Richtung im Rakelbett 1 eingebundene Einsatzteile 4 an Stellen angeordnet sein, an denen bei herkömmlichen Rakelbetten besonders hohe mechanische Belastungen auftreten. Auch hier erstreckt sich das Einsatzteil 4 über die ganze Breite des Rakelbetts 1.2 shows a doctor device with a doctor bed 1 with a centrally arranged insert 4. Thus, one or more insert parts 4 integrated in the doctor bed 1 along the axial direction can be arranged at places where particularly high mechanical loads occur in conventional doctor beds. Here, too, the insert part 4 extends over the entire width of the doctor bed 1.
Fig. 3 zeigt eine Ansicht einer erfindungsgemaßen Rakelvorrichtung mit einem Rakelbett 1 mit einem mittig angeordneten Einsatzteils 4, das durch Formschluss gehaltert ist. Dabei erstreckt sich das Einsatzteil 4 lediglich über einen Teil der Rakelbettbreite und wird allein aufgrund des Formschlusses bereits ausreichend fixiert. Besonders vorteilhaft ist dabei die schwalbenschwanzartige Form. Auch andere, beispielsweise Omega-förmige Geometrien sind denkbar. BezugszeichenlisteFig. 3 shows a view of a doctor device according to the invention with a doctor bed 1 with a centrally arranged insert 4, which is held by positive locking. In this case, the insert part 4 extends only over part of the width of the doctor blade and is already sufficiently fixed due to the positive fit alone. The dovetail shape is particularly advantageous. Other geometries, for example omega-shaped, are also conceivable. LIST OF REFERENCE NUMBERS
Rakelbettdoctor bed
Rakelstabdoctor bar
Nutgroove
Einsatzteil insert

Claims

Patentansprüche claims
1. Rakelbett (1), ausgebildet als Profilieiste mit einer in axialer Richtung durchlaufenden Nut (3) zur Aufnahme eines drehbaren Rakelstabs (2), der gegen eine laufende Oberfläche anpressbar ist und auf die laufende Oberfläche aufgebrachtes flüssiges bis pastoses Medium dosiert und/oder egalisiert, wobei die laufende Oberfläche bei direktem Auftrag des Mediums eine Seite einer Papier-, Karton- oder anderen Faserstoffbahn ist und bei indirektem Auftrag die Oberfläche eines Übertragungselementes ist, welches das Medium an die Faserstoffbahn überträgt, dadurch g e k e n n z e i c h n e t, dass das Rakelbett abschnittsweise in axialer Richtung durch wenigstens ein Einsatzteil (4) gebildet ist, das in Bezug zum übrigen Werkstoff verschleißbeständiger und/oder hitzebeständiger ist.1. Squeegee bed (1), designed as a profiled strip with a groove (3) running through in the axial direction for receiving a rotatable squeegee bar (2) which can be pressed against a running surface and metered liquid to pasty medium applied to the running surface and / or equalized, whereby the running surface is a side of a paper, cardboard or other fibrous web when the medium is applied directly and is the surface of a transfer element that transmits the medium to the fibrous web when indirectly applied, characterized in that the doctor bed in sections in the axial direction Direction is formed by at least one insert part (4) which is more wear-resistant and / or heat-resistant in relation to the other material.
2. Rakelbett nach Anspruch 1 , dadurch g e k e n n z e i c h n e t, dass ein Einsatzteil (4) in der Mitte angeordnet ist oder mehrere Einsatzteile (4) in axialer Richtung im Außenbereich und/oder in der Mitte angeordnet sind.2. Doctor bed according to claim 1, characterized in that an insert part (4) is arranged in the middle or a plurality of insert parts (4) are arranged in the axial direction in the outer region and / or in the middle.
3. Rakelbett nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t, dass eine derartige Bauteilgeometrie des jeweiligen Einsatzteils (4) gewählt ist, dass ein homogener Übergang der für ein Einsatzteil und der übrigen Profilleiste verwendeten Werkstoffe besteht. 3. Doctor bed according to claim 1 or 2, characterized in that such a component geometry of the respective insert (4) is selected such that there is a homogeneous transition of the materials used for an insert and the rest of the profile strip.
4. Rakelbett nach Anspruch 3, dadurch g e k e n n z e i c h n e t, dass gemeinsame Berührungsflächen des jeweiligen Einsatzteils (4) mit dem umgebenden Werkstoff im Wesentlichen unter einem Winkel von 45°-90°, bevorzugt unter 70°-90°, bezüglich der axialen Richtung angeordnet sind.4. Doctor bed according to claim 3, characterized in that common contact surfaces of the respective insert (4) with the surrounding material are arranged essentially at an angle of 45 ° -90 °, preferably below 70 ° -90 °, with respect to the axial direction.
5. Rakelbett nach einem der Ansprüche 1 bis 4, dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) eine hohe Gleitfähigkeit aufweist.5. Doctor bed according to one of claims 1 to 4, characterized in that the respective insert part (4) has a high sliding ability.
10 6. Rakelbett nach einem der Ansprüche 1 bis 5, dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) formbeständiger ist.10 6. Doctor bed according to one of claims 1 to 5, characterized in that the respective insert part (4) is more dimensionally stable.
15 7. Rakelbett nach einem der Ansprüche 1 bis 6, dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) aus Thermoplaste besteht.15 7. Doctor bed according to one of claims 1 to 6, characterized in that the respective insert part (4) consists of thermoplastics.
8. Rakelbett nach Anspruch 7,8. doctor bed according to claim 7,
20 dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) aus Polyethylen oder hochfestem Polyetheretherketon (PEEK) besteht.20 due to the fact that the respective insert (4) consists of polyethylene or high-strength polyether ether ketone (PEEK).
9. Rakelbett nach einem der Ansprüche 1 bis 6,9. doctor bed according to one of claims 1 to 6,
25 dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) aus Polyurethan oder Polyamid besteht.25 by the fact that the respective insert (4) consists of polyurethane or polyamide.
10. Rakelbett nach einem der Ansprüche 1 bis 6, dadurch g e k e n n z e i c h n e t, dass10. doctor bed according to one of claims 1 to 6, characterized g e k e n n z e i c h n e t that
30. das jeweilige Einsatzteil (4) aus einem Werkstoffverbund besteht.30. the respective insert (4) consists of a composite material.
11. Rakelbett nach Anspruch 10, dadurch g e k e n n z e i c h n e , dass der Werkstoffverbund eines Einsatzteils (4) aus Gummi und Graphit aufgebaut ist.11. doctor bed according to claim 10, characterized in that the material composite of an insert (4) is made of rubber and graphite.
12. Rakelbett nach einem der Ansprüche 1 bis 6, dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) aus Keramik besteht.12. Doctor bed according to one of claims 1 to 6, characterized in that the respective insert part (4) consists of ceramic.
13. Rakelbett nach einem der Ansprüche 1 bis 6, dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) aus Metall besteht.13. Doctor bed according to one of claims 1 to 6, characterized in that the respective insert part (4) consists of metal.
14. Rakelbett nach Anspruch 13, dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) aus einer Kupferlegierung besteht, beispielsweise aus Bronze.14. Doctor bed according to claim 13, characterized in that the respective insert part (4) consists of a copper alloy, for example of bronze.
15. Rakelbett nach einem der Ansprüche 1 bis 14, dadurch g e k e n n z e i c h n e t, dass das jeweilige Einsatzteil (4) formschlüssig, geklebt, geschraubt, genietet, eingepresst, eingegossen oder eingeschweißt ist. 15. Squeegee bed according to one of claims 1 to 14, characterized in that the respective insert part (4) is positively, glued, screwed, riveted, pressed in, cast in or welded in.
EP05733530A 2004-05-14 2005-04-14 Doctor blade holder Not-in-force EP1748852B1 (en)

Applications Claiming Priority (2)

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DE102004024079A DE102004024079A1 (en) 2004-05-14 2004-05-14 doctor bed
PCT/EP2005/051640 WO2005110621A1 (en) 2004-05-14 2005-04-14 Doctor blade holder

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EP1748852A1 true EP1748852A1 (en) 2007-02-07
EP1748852B1 EP1748852B1 (en) 2008-10-08

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US (1) US20070131163A1 (en)
EP (1) EP1748852B1 (en)
JP (1) JP4672721B2 (en)
CN (1) CN100441319C (en)
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BR (1) BRPI0510199B1 (en)
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ATE410242T1 (en) 2008-10-15
CN1976762A (en) 2007-06-06
DE502005005627D1 (en) 2008-11-20
US20070131163A1 (en) 2007-06-14
EP1748852B1 (en) 2008-10-08
BRPI0510199B1 (en) 2018-02-14
CN100441319C (en) 2008-12-10
DE102004024079A1 (en) 2005-12-08
WO2005110621A1 (en) 2005-11-24
BRPI0510199A (en) 2008-03-04
JP4672721B2 (en) 2011-04-20

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