EP0301061B1 - Applicator with rolling scraper for applying coatings on webs of material - Google Patents

Applicator with rolling scraper for applying coatings on webs of material Download PDF

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Publication number
EP0301061B1
EP0301061B1 EP88901583A EP88901583A EP0301061B1 EP 0301061 B1 EP0301061 B1 EP 0301061B1 EP 88901583 A EP88901583 A EP 88901583A EP 88901583 A EP88901583 A EP 88901583A EP 0301061 B1 EP0301061 B1 EP 0301061B1
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EP
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Prior art keywords
ductor
core
roll
sheathing
web
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EP88901583A
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German (de)
French (fr)
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EP0301061A1 (en
Inventor
Herbert Sommer
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Jagenberg AG
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Jagenberg AG
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Priority to AT88901583T priority Critical patent/ATE57480T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • B05C1/0817—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 characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • 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
    • B05C1/083—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 being passed between the coating roller and one or more backing 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D21H23/60—Details thereof, e.g. surface characteristics, peripheral speed the material on the applicator roll being subjected to a particular treatment before applying to the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod

Definitions

  • the invention relates to a roller scraper applicator for direct or indirect application of coatings to material webs with a doctor rod rotatably mounted in a holder, resting on the material web or on a roller guiding the material web.
  • Roller scraper applicators of this type are used to apply primers and top coats directly or indirectly to cardboard and paper.
  • Other, non-pigmented application media for example for surface gluing, for coating or pretreating technical papers and films, are also suitable.
  • dry application weights 0.5 to 20 g / m 2 are sought with a surface that is as smooth as possible, ie with a good cross profile without streaking.
  • the thickness of the coating is established on the basis of an equilibrium of forces between the elastic pressure and the hydrodynamic liquid pressure of the application medium which arises in the wedge-shaped gap between the material web or the roller guiding the material web and the doctor rod.
  • Rotatable doctor rods made of solid steel are known and described in DE-PS 30 22 955. They are well suited for the metered application of pigment coats on paper, so that a desired coat weight range with a good cross profile can be covered as far as possible.
  • doctor blades are less suitable if a pigmented application medium is to be applied indirectly first to a rubberized roller or directly to a very smooth, closed web surface, for example a film.
  • the hydrodynamic fluid pressure is often so low that the contact pressure cannot be reduced as much as would be necessary without any irregularities in the transverse profile, i.e. Streaks with lower and higher order result.
  • the object of the invention is to improve the roller scraper applicator in such a way that there is a wide coat weight range with a good cross profile on different web materials and with a wide variety of coating materials.
  • the doctor rod in the case of a roller scraper applicator of the type mentioned at the outset, the doctor rod consists of a core and a sheathing with different elastic modulus. In this way, the relatively high rigidity in relation to the contact pressure can be reduced in the case of a doctor rod made of solid material, so that the doctor rod lies evenly against the material web or aligns the surface of a counter roller.
  • the doctor rod according to the invention consisting of a core and a jacket with a different modulus of elasticity, is based on the knowledge that a reduction in the doctor rod diameter alone reduces its rigidity, but does not provide a solution to the problem, since with the reduction in the doctor rod diameter, the hydrodynamic liquid pressure due to the geometric change in the dosing zone, ie with the associated increase in the wedge angle, drops faster than the stiffness of the doctor rod decreases.
  • the modulus of elasticity of the sheathing is preferably smaller than that of the core, which can advantageously be achieved in that the sheathing is made of plastic, for example PTFE or PVC, and the core is made of steel.
  • the core absorbs the torsional stress that occurs in the doctor rod, while the flexible plastic coating brings the outside diameter to the value that is required for optimal coating.
  • the diameter of the steel core is preferably 6 to 10 mm and the outer diameter of the plastic sheathing is 10 to 20 mm.
  • the surface of the core can be structured, e.g. out of round and the complementary inner surface of the casing, for example, be positively connected to the surface of the core.
  • a thin-walled, wear-resistant casing can be placed around the casing, which consists of an approximately 0.3 mm thick steel casing.
  • This embodiment is used in particular for the direct coating of paper webs, since increased wear of the elastic sheathing occurs in this application.
  • the squeegee rod is driven, preferably in the opposite direction to the counter-roller movement or to the material web movement, and is mounted in the holder by means of a squeegee bed from a compressed air hose, so that the contact pressure can be changed by changing the compressed air supply to the hose.
  • the coating material is applied directly to a material web.
  • a material web 2 runs around a counter roller 1, of which only one segment is shown, and is provided with a coating 3 of a predetermined square meter weight.
  • excess coating material is removed by means of a doctor rod 5 rotatably mounted in a holder 4.
  • This doctor rod 5 is driven counter to the direction of movement of the counter-roller 1 indicated by an arrow and displaces the superfluous coating material downwards, where it drips into a tub (not shown).
  • the doctor rod 5 consists of a core 6 made of steel, on which the drive torque acts.
  • the core 6 is provided with a casing 7 made of plastic, for example PTFE or PVC, and additionally has a wear-resistant casing 8, which in turn consists of steel. This wear-resistant sleeve 8 is required when the coating material and the material web 2 lead to increased abrasion of the doctor rod 5.
  • the doctor rod 5 is held in a doctor bed 9, which consists of a compressed air rubber tube with a hollow chamber 10.
  • a doctor bed 9 which consists of a compressed air rubber tube with a hollow chamber 10.
  • the modulus of elasticity of PTFE is approximately 400 N / mm 2 and that of steel is approximately 210,000 N / mm 2
  • the bending resistance of the doctor rod according to the invention is thus only about a fifth of that of a doctor rod made of solid steel.
  • the coating 3 is applied indirectly.
  • the material web 2 is only brought up to the roller when the coating 3 has been applied in the manner described to the roller surface instead of onto the material web.
  • the coating is then taken over by the material web guided up and around the roller 1.
  • the counter-rollers 1 Since the counter-rollers 1 have a rubber or rubber jacket, hardly any abrasion occurs on the doctor rods 5. These therefore do not require a wear-resistant casing. Their construction corresponds to the doctor rod shown in FIG. 1, with the wear-resistant casing 8 missing. The casing 7 of the doctor rods 5 is thus on the counter-rollers 1.
  • a roller applicator 11 with an ink pan 12 and an application roller 13 is used in both embodiments.
  • the application rollers 13 scoop the coating material from the ink trays 12 and carry it in excess on the material web 2 (FIG. 1) or the counter-rollers 1 ( Figure 2).
  • Dosing to the desired coat weight is then carried out using the roller scrapers 5 according to the invention.

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  • Coating Apparatus (AREA)

Abstract

An applicator with a rolling scraper for directly or indirectly applying fluid coatings (3) on webs of material (2) has a scraping bar (5) rotatably mounted in a support (9) and lying with a variable pressure on a web of material conveyed around a counter-roller (1) or on a web-guiding roller. The scraping bar (5) is composed of a core (6) with a high modulus of elasticity and of an envelope (7) with a low modulus of elasticity, in order to generate uniform coating films from the most different materials with different coating thicknesses.

Description

Technisches GebietTechnical field

Die Erfindung betrifft ein Rollschaberauftragwerk zum direkten oder indirekten Auftragen von Beschichtungen auf Materialbahnen mit einer in einem Halter drehbar gelagerten, auf der Materialbahn oder auf einer die Materialbahn führenden Walze aufliegenden Rakelstange.The invention relates to a roller scraper applicator for direct or indirect application of coatings to material webs with a doctor rod rotatably mounted in a holder, resting on the material web or on a roller guiding the material web.

Derartige Rollschaberauftragwerke dienen dazu, Vor- und Deckstriche direkt oder indirekt auf Karton und Papier aufzutragen. Auch andere, nicht pigmentierte Auftragmedien, beispielsweise zum Oberflächenleimen, zum Beschichten oder Vorbehandeln technischer Papiere und Folie kommen in Frage. Abhängig von der Laufgeschwindigkeit der Materialbahn, ihren Materialeigenschaften sowie der Zusammensetzung und dem rheologischen Verhalten der Auftragmedien strebt man Trockenauftraggewichte von 0,5 bis 20 g/m2 bei möglichst glatter Oberfläche, d.h. bei gutem Querprofil ohne Streifenbildung an.Roller scraper applicators of this type are used to apply primers and top coats directly or indirectly to cardboard and paper. Other, non-pigmented application media, for example for surface gluing, for coating or pretreating technical papers and films, are also suitable. Depending on the running speed of the material web, its material properties as well as the composition and the rheological behavior of the application media, dry application weights of 0.5 to 20 g / m 2 are sought with a surface that is as smooth as possible, ie with a good cross profile without streaking.

Die Dicke der Beschichtung stellt sich aufgrund eines Kräftegleichgewichts zwischen elastischer Anpressung und dem im keilförmigen Spalt zwischen der Materialbahn oder der die Materialbahn führenden Walze und der Rakelstange entstehenden hydrodynamischen Flüssigkeitsdruck des Auftragsmediums ein.The thickness of the coating is established on the basis of an equilibrium of forces between the elastic pressure and the hydrodynamic liquid pressure of the application medium which arises in the wedge-shaped gap between the material web or the roller guiding the material web and the doctor rod.

Stand der TechnikState of the art

Drehbare Rakelstangen aus Stahlvollmaterial sind bekannt und in der der DE-PS 30 22 955 beschrieben. Sie sind zum dosierten Aufbringen von Pigmentstrichen auf Papier gut geeignet, so daß sich ein gewünschter Strichgewichtsbereich bei gutem Querprofil weitestgehend abdecken läßt.Rotatable doctor rods made of solid steel are known and described in DE-PS 30 22 955. They are well suited for the metered application of pigment coats on paper, so that a desired coat weight range with a good cross profile can be covered as far as possible.

Demgegenüber sind diese Rakelstangen weniger gut geeignet, wenn ein pigmentiertes Auftragmedium indirekt zunächst auf eine gummierte Walze oder direkt auf eine sehr glatte, geschlossene Warenbahnoberfläche, beispielsweise eine Folie, aufgetragen werden soll.In contrast, these doctor blades are less suitable if a pigmented application medium is to be applied indirectly first to a rubberized roller or directly to a very smooth, closed web surface, for example a film.

In diesen Fällen ergibt sich häufig ein so niedriger hydro- dynamischer Flüssigkeitsdruck, daß sich der Anpreßdruck nicht so weit herabsetzen läßt, wie das erforderlich wäre, ohne daß sich Ungleichmäßigkeiten im Querprofil, d.h. Streifen mit geringerem und höherem Auftrag ergeben.In these cases, the hydrodynamic fluid pressure is often so low that the contact pressure cannot be reduced as much as would be necessary without any irregularities in the transverse profile, i.e. Streaks with lower and higher order result.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, das Rollschaberauftragwerk so zu verbessern, daß sich ein weiter Strichgewichts- bereich bei gutem Querprofil auf unterschiedlichen Bahnmaterialien und mit den verschiedensten Beschichtungsmaterialien ergibt.The object of the invention is to improve the roller scraper applicator in such a way that there is a wide coat weight range with a good cross profile on different web materials and with a wide variety of coating materials.

Gelöst wird diese Aufgabe dadurch, daß bei einem Rollschaberauftragwerk der eingangs erwähnten Art erfindungsgemäß die Rakelstange aus einem Kern und einer Ummantelung mit unterschiedlich großem Elastizitätsmodul besteht. Auf diese Weise läßt sich die bei einer Rakelstange aus Vollmaterial im Verhältnis zur Anpressung relativ hohe Steifigkeit verringern, so daß sich die Rakelstange gleichmäßig an die Materialbahn anlegt bzw. Oberfläche einer Gegenwalze ausrichtet.This object is achieved in that, in the case of a roller scraper applicator of the type mentioned at the outset, the doctor rod consists of a core and a sheathing with different elastic modulus. In this way, the relatively high rigidity in relation to the contact pressure can be reduced in the case of a doctor rod made of solid material, so that the doctor rod lies evenly against the material web or aligns the surface of a counter roller.

Die erfindungsgemäße Rakelstange aus einem Kern und einer Ummantelung mit unterschiedlich großem Elastizitätsmodul beruht auf der Erkenntnis, daß eine Verringerung des Rakelstangendurchmessers allein zwar deren Steifigkeit verringert, jedoch keine Lösung des Problems ergibt, da mit der Verringerung des Rakelstangendurchmessers auch der hydrodynamische Flüssigkeitsdruck aufgrund der geometrischen Änderung in der Dosierzone, d.h. mit der damit einhergehenden Vergrößerung des Keilwinkels, schneller absinkt, als sich die Steifigkeit der Rakelstange verringert.The doctor rod according to the invention, consisting of a core and a jacket with a different modulus of elasticity, is based on the knowledge that a reduction in the doctor rod diameter alone reduces its rigidity, but does not provide a solution to the problem, since with the reduction in the doctor rod diameter, the hydrodynamic liquid pressure due to the geometric change in the dosing zone, ie with the associated increase in the wedge angle, drops faster than the stiffness of the doctor rod decreases.

Umgekehrt führt eine Vergrößerung des Rakelstangendurchmessers zwar zu einer Erhöhung des hydrodynamischen Flüssigkeitsdrucks in der Dosierzone, jedoch steigt der Flüssigkeitsdruck langsamer an als sich die Steifigkeit der Rakelstange mit zunehmendem Druchmesser vergrößert.Conversely, an increase in the doctor rod diameter leads to an increase in the hydrodynamic liquid pressure in the metering zone, but the liquid pressure rises more slowly than the stiffness of the doctor rod increases with increasing diameter.

Vorzugsweise ist der Elastizitätsmodul der Ummantelung kleiner als der des Kerns, was sich vorteilhafterweise dadurch erreichen läßt, daß die Ummantelung aus Kunststoff, beispielsweise PTFE oder PVC, und der Kern aus Stahl besteht.The modulus of elasticity of the sheathing is preferably smaller than that of the core, which can advantageously be achieved in that the sheathing is made of plastic, for example PTFE or PVC, and the core is made of steel.

Der Kern nimmt hierbei die in der Rakelstange auftretende Torsionsspannung auf, während die flexible Kunststoffummantelung den Außendurchmeser auf den Wert bringt, der für ein optimales Beschichten erforderlich ist.The core absorbs the torsional stress that occurs in the doctor rod, while the flexible plastic coating brings the outside diameter to the value that is required for optimal coating.

Der Durchmesser des Stahlkerns liegt vorzugsweise bei 6 bis 10 mm und der Außendurchmeser der Kunststoffummantelung bei 10 bis 20 mm.The diameter of the steel core is preferably 6 to 10 mm and the outer diameter of the plastic sheathing is 10 to 20 mm.

Um ein Versetzen oder Verrutschen des Kunststoffmantels gegenüber dem Stahlkern zu verhindern, kann die Oberfläche des Kerns strukturiert, z.B. unrund und die beispielsweise komplementäre Innenfläche der Ummantelung formschlüssig mit der Oberfläche des Kerns verbunden sein.In order to prevent the plastic jacket from shifting or slipping relative to the steel core, the surface of the core can be structured, e.g. out of round and the complementary inner surface of the casing, for example, be positively connected to the surface of the core.

Des weiteren kann zusätzlich eine dünnwandige, verschleißfeste Hülle um die Ummantelung herumgelegt sein, die aus einem etwa 0,3 mm dicken Stahlmantel besteht. Diese Ausführungsform wird insbesondere zum direkten Beschichten von Papierbahnen eingesetzt, da bei dieser Anwendung ein erhöhter Verschleiß der elastischen Ummantelung auftritt.Furthermore, a thin-walled, wear-resistant casing can be placed around the casing, which consists of an approximately 0.3 mm thick steel casing. This embodiment is used in particular for the direct coating of paper webs, since increased wear of the elastic sheathing occurs in this application.

Die Rakelstange ist angetrieben, vorzugsweise gegensinnig zur Gegenwalzenbewegung bzw. zur Materialbahnbewegung, und mittels eines Rakelbetts aus einem druckluftbeaufschlagten Schlauch im Halter gelagert, so daß sich der Anpreßdruck durch Änderung der Druckluftbeaufschlagung des Schlauchs verändern läßt.The squeegee rod is driven, preferably in the opposite direction to the counter-roller movement or to the material web movement, and is mounted in the holder by means of a squeegee bed from a compressed air hose, so that the contact pressure can be changed by changing the compressed air supply to the hose.

Kurze Beschreibung der ZeichnungBrief description of the drawing

Die Zeichnung dient zur Erläuterung der Erfindung anhand zweier Ausführungsbeispiele. In der Zeichnung zeigt:

  • Fig. 1 Ausschnittweise ein Rollschaberauftragwerk zum direkten Beschichten einer Papierbahn, die um eine Gegenwalze geführt ist.
  • Fig. 2 ein Rollschaberauftragwerk zum beiderseitigen indirekten Beschichten einer Materialbahn.
The drawing serves to explain the invention using two exemplary embodiments. The drawing shows:
  • Fig. 1 cutout a roller scraper application for direct coating of a paper web, which is guided around a counter roller.
  • 2 shows a roller scraper applicator for indirect coating of a material web on both sides.

Wege zur Ausführung der ErfindungWays of Carrying Out the Invention

Bei der Ausführungsform nach Figur 1 wird das Beschichtungsmaterial direkt auf eine Materialbahn aufgetragen. Um eine Gegenwalze 1, von der nur ein Segment dargestellt ist, läuft eine Materialbahn 2 und wird mit einer Beschichtung 3 vorgegebenen Quadratmetergewichts versehen. Um dieses Quadratmetergewicht zu erreichen, wird überschlüssiges Beschichtungsmaterial mittels einer in einem Halter 4 drehbar gelagerten Rakelstange 5 entfernt.In the embodiment according to FIG. 1, the coating material is applied directly to a material web. A material web 2 runs around a counter roller 1, of which only one segment is shown, and is provided with a coating 3 of a predetermined square meter weight. In order to achieve this square meter weight, excess coating material is removed by means of a doctor rod 5 rotatably mounted in a holder 4.

Diese Rakelstange 5 ist entgegen der durch einen Pfeil angegebenen Bewegungsrichtung der Gegenwalze 1 angetrieben und verdrängt das überflüssige Beschichtungsmaterial nach unten, wo es in eine nicht dargestellte Wanne abtropft. Die Rakelstange 5 besteht aus einem Kern 6 aus Stahl, auf den das Antriebsmoment wirkt. Der Kern 6 ist mit einer Ummantelung 7 aus Kunststoff, beispielsweise PTFE oder PVC, versehen und weist zusätzlich eine verschleißfeste Hülle 8 auf, die wiederum aus Stahl besteht. Diese verschleißfeste Hülle 8 ist dann erforderlich, wenn das Beschichtungsmaterial und die Materialbahn 2 zu einem erhöhten Abrieb der Rakelstange 5 führen.This doctor rod 5 is driven counter to the direction of movement of the counter-roller 1 indicated by an arrow and displaces the superfluous coating material downwards, where it drips into a tub (not shown). The doctor rod 5 consists of a core 6 made of steel, on which the drive torque acts. The core 6 is provided with a casing 7 made of plastic, for example PTFE or PVC, and additionally has a wear-resistant casing 8, which in turn consists of steel. This wear-resistant sleeve 8 is required when the coating material and the material web 2 lead to increased abrasion of the doctor rod 5.

Die Rakelstange 5 ist in einem Rakelbett 9 gehalten, das aus einem mit Druckluft beaufschlagten Gummischlauch mit einer Hohlkammer 10 besteht. Durch eine Änderung des Luftdrucks in der Hohlkammer 10 läßt sich der Anpreßdruck der Materialbahn 2 und dem Beschichtungsmaterial anpassen, so daß der Strichauftrag eine einwandfreie Oberfläche aufweist und sich sein Quadratmetergewicht in weiten Grenzen variieren läßt.The doctor rod 5 is held in a doctor bed 9, which consists of a compressed air rubber tube with a hollow chamber 10. By changing the air pressure in the hollow chamber 10, the contact pressure of the material web 2 and the coating material can be adjusted so that the line application has a perfect surface and its square meter weight can be varied within wide limits.

Da der Elastizitätsmodul von PTFE ungefähr 400 N/mm2 und der von Stahl etwa 210 000 N/mm2 beträgt, ergibt sich für den Biegewiderstand einer Rakelstange mit 12 mm Durchmesser aus Stahlvollmaterial E x 1 = 2,2 x 108 N/mm2, während sich der Biegewiderstand für eine erfindungsgemäße Rakelstange mit einem Kerndurchmesser von 8 mm und einem Außendurchmesser von 12 mm, deren Kern aus Stahl und deren Ummantelung aus PTFE besteht, E x I = 0,43 x 108 N/mm2 ergibt. Der Biegewiderstand der erfindungsgemäßen Rakelstange beträgt somit nur etwa ein Fünftel desjenigen einer Rakelstange aus Stahlvollmaterial. Auch wenn zusätzlich noch eine dünnwandige, verschleißfeste Hülle aus Stahl mit einer Wanddicke von 0,3 mm um die Ummantelung aus PTFE herumgelegt ist, erhöht sich der Biegewiderstand mit E x 1 = 0,85 x 108 N/mm2 nur auf das Doppelte; er liegt immer noch erheblich unter dem Biegewiderstand einer Rakelstange gleichen Durchmessers aus Stahlvollmaterial.Since the modulus of elasticity of PTFE is approximately 400 N / mm 2 and that of steel is approximately 210,000 N / mm 2 , the bending resistance of a doctor rod with a diameter of 12 mm from solid steel material is E x 1 = 2.2 x 10 8 N / mm 2 , while the bending resistance for a doctor rod according to the invention with a core diameter of 8 mm and an outer diameter of 12 mm, the core of which is made of steel and the sheathing of which is made of PTFE, results in E x I = 0.43 x 10 8 N / mm 2 . The bending resistance of the doctor rod according to the invention is thus only about a fifth of that of a doctor rod made of solid steel. Even if a thin-walled, wear-resistant steel sheath with a wall thickness of 0.3 mm is wrapped around the PTFE sheathing, the bending resistance increases only twice with E x 1 = 0.85 x 10 8 N / mm 2 ; it is still considerably below the bending resistance of a doctor rod of the same diameter made of solid steel.

Bei der Ausführungsform nach Figur 2 wird die Beschichtung 3 indirekt auftragen. In diesem Fall wird die Materialbahn 2 erst dann an die Walze herangeführt, wenn die Beschichtung 3 in der beschriebenen Weise dosiert auf die Walzenoberfläche statt auf die Materialbahn aufgetragen ist.In the embodiment according to FIG. 2, the coating 3 is applied indirectly. In this case, the material web 2 is only brought up to the roller when the coating 3 has been applied in the manner described to the roller surface instead of onto the material web.

Die Beschichtung wird dann von der an die Walze 1 heran- und herumgeführten Materialbahn übernommen.The coating is then taken over by the material web guided up and around the roller 1.

Da die Gegenwalzen 1 einen Gummi- oder Kautschukmantel aufweisen, tritt kaum Abrasion an den Rakelstangen 5 auf. Diese benötigen daher keine verschleißfeste Hülle. Ihr Aufbau entspricht der in Figur 1 gezeigten Rakelstange, wobei die verschleißfeste Hülle 8 fehlt. Die Ummantelung 7 der Rakelstangen 5 liegt somit an den Gegenwalzen 1 an.Since the counter-rollers 1 have a rubber or rubber jacket, hardly any abrasion occurs on the doctor rods 5. These therefore do not require a wear-resistant casing. Their construction corresponds to the doctor rod shown in FIG. 1, with the wear-resistant casing 8 missing. The casing 7 of the doctor rods 5 is thus on the counter-rollers 1.

Zum Auftragen des Beschichtungsmaterials im Überschuß dient nach beiden Ausführungsformen ein Walzenauftragwerk 11 mit einer Farbwanne 12 und einer Auftragwalze 13. Die Auftragwalzen 13 schöpfen das Beschichtungsmaterial aus den Farbwannen 12 und tragen es im Überschuß auf die Materialbahn 2 (Figur 1 ) oder die Gegenwalzen 1 (Figur 2) auf.To apply the coating material in excess, a roller applicator 11 with an ink pan 12 and an application roller 13 is used in both embodiments. The application rollers 13 scoop the coating material from the ink trays 12 and carry it in excess on the material web 2 (FIG. 1) or the counter-rollers 1 ( Figure 2).

Die Dosierung auf das gewünschte Strichgewicht erfolgt anschließend mit den erfindungsgemäßen Rollschabern 5.Dosing to the desired coat weight is then carried out using the roller scrapers 5 according to the invention.

Claims (9)

1. Roll-ductor applicator for the direct or indirect application of coatings to webs of material, with a rotatably mounted ductor rod resting on the web of material or on a roller guiding the web of material, characterized in that the ductor rod (5) consists of a core (6) and of a sheathing (7) with a differing modulus of elasticity.
2. Roll-ductor applicator according to Claim 1, characterized in that the modulus of elasticity of the sheathing (7) is lower than that of the core (6).
3. Roll-ductor applicator according to Claim 1 or 2, characterized in that the sheathing (7) consists of plastic and the core (6) of steel.
4. Roll-ductor applicator according to Claim 3, characterized in that the diameter of the steel core (6) is 6 to 10 mm and the outside diameter of the plastic sheathing (7) is 10 to 20 mm.
5. Roll-ductor applicator according to one or more of Claims 1 to 4, characterized in that the surface of the core (6) is structured and the inner face of the sheathing (7) is connected positively to the surface of the core.
6. Roll-ductor applicator according to one or more of Claims 2 to 5, characterized in that a thin- walled wear-resistant envelope (8) surrounds the sheathing (7).
7. Roll-ductor applicator according to one or more of Claims 1 to 6, characterized in that the ductor rod (5) is driven.
8. Roll-ductor applicator according to Claim 7, characterized in that the ductor rod (5) is driven in the opposite direction to the movement of the web of material or of the roller guiding the web of material.
9. Roll-ductor applicator according to one or more of Claims 1 to 8, characterized in that the ductor rod (5) is mounted in the holder (4) by means of a ductor bed (9) consisting of a hose loaded with compressed air.
EP88901583A 1987-02-07 1988-02-06 Applicator with rolling scraper for applying coatings on webs of material Expired - Lifetime EP0301061B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88901583T ATE57480T1 (en) 1987-02-07 1988-02-06 ROLLER SCRAPER APPLICATOR FOR APPLYING COATINGS TO MATERIAL WEBS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3703834 1987-02-07
DE19873703834 DE3703834A1 (en) 1987-02-07 1987-02-07 ROLLER SCRAPER APPLICATION TO APPLY COATINGS ON MATERIALS

Publications (2)

Publication Number Publication Date
EP0301061A1 EP0301061A1 (en) 1989-02-01
EP0301061B1 true EP0301061B1 (en) 1990-10-17

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EP88901583A Expired - Lifetime EP0301061B1 (en) 1987-02-07 1988-02-06 Applicator with rolling scraper for applying coatings on webs of material

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EP (1) EP0301061B1 (en)
DE (2) DE3703834A1 (en)
FI (1) FI884637A0 (en)
WO (1) WO1988005698A1 (en)

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DE4341341C1 (en) * 1993-12-06 1995-03-09 Jagenberg Ag Metering system for devices for coating material webs, in particular paper or board webs
DE29609053U1 (en) * 1996-05-20 1996-08-22 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Device for the direct or indirect application or final metering of a liquid or pasty medium onto a running material web
FI104103B (en) * 1998-11-09 1999-11-15 Valmet Corp The coating bar
FI106139B (en) * 1999-03-26 2000-11-30 Valmet Corp Stavskavare
JP2002239431A (en) * 2001-02-13 2002-08-27 Mitsubishi Heavy Ind Ltd Coating apparatus and method for manufacturing coated paper
DE102005009590A1 (en) * 2005-02-25 2006-08-31 Kiener Maschinenbau Gmbh Dosing device for coating and laminating machines has doctor blade whose scraping edge is flush with separator pointing away from applicator roller to keep out particles
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JP5884985B2 (en) * 2012-05-14 2016-03-15 Ｊｆｅスチール株式会社 Painting equipment
CN113106780A (en) * 2021-04-19 2021-07-13 刘小建 Antibacterial kraft paper and preparation method thereof

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GB1449993A (en) * 1973-10-01 1976-09-15 American Can Co Method and apparatus for distributing plastics on an irregular wokpiece surface
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Also Published As

Publication number Publication date
FI884637A (en) 1988-10-07
DE3860821D1 (en) 1990-11-22
WO1988005698A1 (en) 1988-08-11
DE3703834A1 (en) 1988-08-18
EP0301061A1 (en) 1989-02-01
FI884637A0 (en) 1988-10-07

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