EP0418476B1 - Apparatus for coating a webmaterial moving around a counter roll - Google Patents

Apparatus for coating a webmaterial moving around a counter roll Download PDF

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Publication number
EP0418476B1
EP0418476B1 EP90110856A EP90110856A EP0418476B1 EP 0418476 B1 EP0418476 B1 EP 0418476B1 EP 90110856 A EP90110856 A EP 90110856A EP 90110856 A EP90110856 A EP 90110856A EP 0418476 B1 EP0418476 B1 EP 0418476B1
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EP
European Patent Office
Prior art keywords
doctor blade
counter
piezotranslators
roller
coating
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.)
Expired - Lifetime
Application number
EP90110856A
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German (de)
French (fr)
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EP0418476A2 (en
EP0418476A3 (en
Inventor
Egbert Dr.-Ing. Most
Reinhard Knop
Runald Meyer
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Jagenberg AG
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Jagenberg AG
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Publication date
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Priority to AT90110856T priority Critical patent/ATE94781T1/en
Publication of EP0418476A2 publication Critical patent/EP0418476A2/en
Publication of EP0418476A3 publication Critical patent/EP0418476A3/en
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Publication of EP0418476B1 publication Critical patent/EP0418476B1/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
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/041—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades
    • B05C11/042—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades allowing local positioning, loading or deforming along the blades
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • 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 device for coating a material web, in particular a paper or cardboard web, guided around a counter roller, according to the preamble of patent claim 1.
  • the known coating devices have an applicator (roller or nozzle applicator) with which the coating material, for. B. coating color, is applied in excess to the web.
  • a metering system arranged after the application unit with a scraper knife as metering element doses the coating color to the desired coat weight, the setting of which is carried out via the contact pressure of the scraper knife on the counter roller.
  • EP-A-0 307 618 describes a generic coating device in which the elastic scraper knife is supported by a support bar and adjustment elements below the support bar act independently of one another on individual areas of the scraper knife.
  • Spindle hoists alternatively pneumatically or hydraulically actuated adjusting elements or thermal expansion elements, and independently pressurizable pressure chambers are used as adjusting elements, with which the contact pressure of the doctor knife can be automatically and locally adjusted differently during operation.
  • the invention has for its object to provide a generic device in which the adjusting elements are able to react very quickly to changes in the coating weight, allow a very sensitive influence on the coating weight and are encapsulated against contamination for a control with high resolution are arranged close to each other can.
  • Piezo translators have a high resolution of the travel ranges in the nanometer range and, thanks to their slim design, can be encapsulated close to each other to protect them against contamination.
  • Another advantage is that a reproducible setting of the contact pressure after production interruptions is possible and wear on the doctor blade tip can be compensated for during production.
  • claim 2 contains a particularly advantageous embodiment for transferring a locally different contact pressure to the doctor blade, a coating weight control is made possible to a greater extent in the embodiment according to claim 3.
  • the translation is optimally matched to the forces that can be applied by the piezotranslator and the counterforces when the doctor blade is bent for the greatest possible adjustment path.
  • too low tensile forces of the piezotranslator can be increased by the spring to the required degree.
  • the feature of claim 6 enables an optimal adjustment of the counterforce of the spring, since this also reduces the pressing force of the piezotranslator.
  • the displaceable mounting of the piezotranslators according to claim 7 enables a rough adjustment before the start of the coating process, which extends beyond the maximum adjustment path of the piezotranslators.
  • the material web 2 which is provided with a layer 1 applied in excess, a paper or cardboard web, is guided around a counter roller 3 in the area of the metering system.
  • the metering system contains a scraper bar 4 in which a clamping bar 5 which is displaceable in the direction of the counter roll 3 is mounted.
  • the metering element - an elastic scraper knife 6 - is clamped on its foot in the clamping bar 5.
  • a support bar 7 engages on the scraper knife 6, which on the scraper bar 4 for adjusting the contact pressure approximately parallel to the direction of movement of the clamping bar 5 is slidably mounted.
  • the support bar 7, which extends over the working width, is slotted at regular intervals on the side opposite the support line, or is designed to be flexible in some other way, and is therefore flexible to a limited extent in order to enable the setting of a locally different contact pressure across the width of the scraper knife 6.
  • the support bar 7 is mounted on the scraper bar 4 via axially displaceable bolts 8 which are fastened to the rear at regular intervals - preferably approximately every 75 mm - and each of which is engaged by an adjustment mechanism, a preferred embodiment of which is shown in more detail in FIGS. 2 and 3 is described:
  • the bolts 8, which extend radially from the counter-roller 3, are mounted at a distance from the support bar 7 in a bar 9 which extends over the working width, a spring 10 pushing away from the counter-roller 3, the spring force of which is screwed with a screw 11, onto the projecting end is adjustable.
  • a lever 12 substantially parallel to the support bar 7 is articulated on the bolt 8, the other end of which is rotatably fastened on the scraper bar 4 about the point 13.
  • a further bolt 14 which is essentially parallel to the latter, for the transmission of the compressive forces is fastened and which is likewise arranged displaceably through the strip 9.
  • the fastening points of the bolts 8 and 14 on the lever 12 are selected so that a transmission ratio of the movement of the bolt 8 to the movement of the bolt 14 is between 1/1 and 10/1, preferably approximately 4/1.
  • the end of the bolt 14 protruding from the strip 9 is connected via a joint 15 to a piezo translator 16 which extends away from the counter-roller 3 and is slidably attached to the scraper beam 4 at its other end.
  • a sliding segment 18 is connected via a joint 17, which is displaceable on the scraper beam 4 rests and can be positioned by an adjusting screw 19 via a differential thread 20 in the direction of the counter roller 3 and away from it.
  • pressure-medium-operated translation elements can also be used; in particular, the desired transmission ratio can advantageously be realized with hydraulically operating elements.
  • the adjusting screw 19 is operated manually, and a motor drive can also be connected.
  • Each piezotranslator 16 is connected to a voltage supply 16.1 (not shown), the outputs of which are regulated by a control device as a function of the line weight measured in the associated area.
  • a basic setting of the contact pressure of the support bar 7 on the set screws 19 is carried out for the respective areas: turning the set screws 19 causes a displacement of the sliding segment 18, the piezo translator 16 and the pin 18, via the lever 12 and the pin 8 results in a displacement of the support bar 7 which is dependent on the transmission ratio.
  • the fine adjustment of the cross profile during the coating takes place via the piezotranslators 16 for the respective area.
  • the weight distribution is determined over the working width; in the event of deviations from a uniform distribution, the voltage present at the corresponding piezo translator 16 is changed, which causes the piezo translator 16 to expand or contract in the axial direction.
  • the change in length of the piezotranslator 16 is transmitted from the lever 12, in accordance with the transmission ratio, to the bolt 8, which moves the elastic support strip 7 in the respective region toward the counter-roller 3 or away from it.
  • the piezotranslators 16 contract, the required tensile force is applied to the support bar 7 by the spring 10.
  • An increase or decrease in the contact pressure of the doctor knife 6 brings about the desired reduction or increase in the coating weight in the respective area.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Replacement Of Web Rolls (AREA)
  • Lubricants (AREA)
  • Luminescent Compositions (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Dry Shavers And Clippers (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Telephone Set Structure (AREA)

Abstract

In an apparatus for coating a material web (2), in particular a web of paper or cardboard which is guided about an opposite roller (3) and has a scraper blade (6) which can be pressed against the opposite roller (3), piezotranslators (16) arranged over the width of the cutter are used in order to set the contact pressure in individual areas. <??>The piezotranslators (16) preferably act indirectly on a support strip (7) with a path transmission ratio of between 1:1 and 10:1, in particular approximately 4:1. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Beschichten einer um eine Gegenwalze geführten Materialbahn, insbesondere einer Papier- oder Kartonbahn, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for coating a material web, in particular a paper or cardboard web, guided around a counter roller, according to the preamble of patent claim 1.

Die bekannten Beschichtungsvorrichtungen weisen ein Auftragwerk (Walzen- oder Düsenauftragwerk) auf, mit dem das Beschichtungsmaterial, z. B. Streichfarbe, im Überschuß auf die Bahn aufgebracht wird. Ein im Anschluß an das Auftragswerk angeordnetes Dosiersystem mit einem Schabermesser als Dosierelement dosiert die Streichfarbe auf das gewünschte Strichgewicht, dessen Einstellung über den Anpreßdruck des Schabermessers an die Gegenwalze erfolgt.The known coating devices have an applicator (roller or nozzle applicator) with which the coating material, for. B. coating color, is applied in excess to the web. A metering system arranged after the application unit with a scraper knife as metering element doses the coating color to the desired coat weight, the setting of which is carried out via the contact pressure of the scraper knife on the counter roller.

Beim Streichen von Papier- oder Kartonbahnen treten produktionsbedingte Schwankungen im Querprofil der Bahnen auf, die es erforderlich machen, den Anpreßdruck des Schabermessers über die Arbeitsbreite lokal unterschiedlich einzustellen, um einen gleichmäßigen Strich zu erhalten. Dazu kann in der Vorrichtung nach der DE-C-28 25 907 eine in Grenzen biegsame, am Schabermesser anliegende Abstützleiste über Zug- und Druckschrauben entlang der Unterstützungslinie einjustiert werden, je nachdem, ob das Strichgewicht an den entsprechenden Stellen zu hoch oder zu niedrig ist. Eine automatische Regelung der lokalen Verteilung des Anpreßdrucks des Schabermessers, und damit des Strichgewichts, während des Streichens ist nicht möglich.When coating paper or cardboard webs, there are production-related fluctuations in the cross-section of the webs, which make it necessary to adjust the contact pressure of the doctor knife locally differently across the working width in order to obtain a uniform line. For this purpose, in the device according to DE-C-28 25 907, a support bar which is flexible within limits and which bears against the scraper knife can be adjusted via tension and compression screws along the support line, depending on whether the coat weight is too high or too low at the corresponding points . Automatic control of the local distribution of the contact pressure of the doctor knife, and thus the coating weight, during the coating process is not possible.

Die EP-A-0 307 618 beschreibt eine gattungsgemäße Beschichtungsvorrichtung, bei der das elastische Schabermesser von einer Abstützleiste abgestützt wird und unterhalb der Abstützleiste Verstellelemente unabhängig voneinander auf einzelne Bereiche des Schabermessers einwirken. Als Verstellelemente werden Spindelhubwerke, alternativ pneumatisch oder hydraulisch betätigte Verstellelemente oder thermische Ausdehnungselemente, und unabhängig mit Druck beaufschlagbare Druckkammern verwendet, mit denen der Anpreßdruck des Schabermessers während des Betriebs lokal unterschiedlich automatisch eingestellt werden kann.EP-A-0 307 618 describes a generic coating device in which the elastic scraper knife is supported by a support bar and adjustment elements below the support bar act independently of one another on individual areas of the scraper knife. Spindle hoists, alternatively pneumatically or hydraulically actuated adjusting elements or thermal expansion elements, and independently pressurizable pressure chambers are used as adjusting elements, with which the contact pressure of the doctor knife can be automatically and locally adjusted differently during operation.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung zu schaffen, bei der die Verstellelemente in der Lage sind, sehr schnell auf Strichgewichtsänderungen zu reagieren, eine sehr feinfühlige Beeinflussung des Strichgewichts ermöglichen und gegen Verschmutzung abgekapselt für eine Regelung mit hoher Auflösung dicht nebeneinander angeordnet werden können.The invention has for its object to provide a generic device in which the adjusting elements are able to react very quickly to changes in the coating weight, allow a very sensitive influence on the coating weight and are encapsulated against contamination for a control with high resolution are arranged close to each other can.

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

Piezo-Translatoren haben eine hohe Auflösung der Stellwege im Nanometer-Bereich und können aufgrund ihrer schlanken Bauweise gegen Verschmutzung eingekapselt dicht nebeneinander angeordnet werden.Piezo translators have a high resolution of the travel ranges in the nanometer range and, thanks to their slim design, can be encapsulated close to each other to protect them against contamination.

Als weitere Vorteile treten hinzu, daß eine reproduzierbare Einstellung des Anpreßdrucks nach Produktionsunterbrechungen möglich ist und ein Verschleiß der Schabermesserspitze während der Produktion kompensiert werden kann.Another advantage is that a reproducible setting of the contact pressure after production interruptions is possible and wear on the doctor blade tip can be compensated for during production.

Die Unteransprüche enthalten bevorzugte Ausgestaltungen der Erfindung.The subclaims contain preferred embodiments of the invention.

Während Patentanspruch 2 eine besonders vorteilhafte Ausgestaltung zur Übertragung eines lokal unterschiedlichen Anpreßdrucks an das Schabermesser enthält, wird bei der Ausgestaltung nach Anspruch 3 eine Strichgewichtsregelung im größeren Umfang ermöglicht.While claim 2 contains a particularly advantageous embodiment for transferring a locally different contact pressure to the doctor blade, a coating weight control is made possible to a greater extent in the embodiment according to claim 3.

Bei der bevorzugten Ausgestaltung nach Anspruch 4 ist die Übersetzung optimal auf die vom Piezotranslator aufbringbaren Kräfte und die Gegenkräfte beim Verbiegen des Schabermessers für einen möglichst großen Verstellweg abgestimmt.In the preferred embodiment according to claim 4, the translation is optimally matched to the forces that can be applied by the piezotranslator and the counterforces when the doctor blade is bent for the greatest possible adjustment path.

Bei der Ausgestaltung nach Anspruch 5 lassen sich zu geringe Zugkräfte des Piezotranslators durch die Feder auf das erforderliche Maß verstärken. Das Merkmal des Anspruchs 6 ermöglicht eine optimale Einstellung der Gegenkraft der Feder, da diese gleichfalls die Andrückkraft des Piezotranslators verringert.In the embodiment according to claim 5, too low tensile forces of the piezotranslator can be increased by the spring to the required degree. The feature of claim 6 enables an optimal adjustment of the counterforce of the spring, since this also reduces the pressing force of the piezotranslator.

Die verschiebbare Lagerung der Piezotranslatoren nach Anspruch 7 ermöglicht eine Grobeinstellung vor Beginn des Beschichtungsvorgangs, die über den maximalen Verstellweg der Piezotranslatoren hinwegreicht.The displaceable mounting of the piezotranslators according to claim 7 enables a rough adjustment before the start of the coating process, which extends beyond the maximum adjustment path of the piezotranslators.

Die Zeichnung dient zur Erläuterung der Erfindung anhand eines vereinfacht dargestellten Ausführungsbeispiels.

Fig. 1
zeigt eine erfindungsgemäße Vorrichtung in perspektivischer Darstellung quer zur Bahn,
Fig. 2
zeigt eine Seitenansicht und
Fig. 3
eine Draufsicht eines Verstellelementes.
The drawing serves to explain the invention with reference to an embodiment shown in simplified form.
Fig. 1
shows a device according to the invention in a perspective view transverse to the web,
Fig. 2
shows a side view and
Fig. 3
a plan view of an adjusting element.

Die mit einer im Überschuß aufgetragenen Schicht 1 versehene Materialbahn 2, eine Papier- oder Kartonbahn, wird im Bereich des Dosiersystems um eine Gegenwalze 3 geführt. Das Dosiersystem enthält einen Schaberbalken 4, in dem ein in Richtung zur Gegenwalze 3 verschiebbarer Klemmbalken 5 gelagert ist. Im Klemmbalken 5 ist das Dosierelement - ein elastisches Schabermesser 6 - an seinem Fuß eingespannt.The material web 2, which is provided with a layer 1 applied in excess, a paper or cardboard web, is guided around a counter roller 3 in the area of the metering system. The metering system contains a scraper bar 4 in which a clamping bar 5 which is displaceable in the direction of the counter roll 3 is mounted. The metering element - an elastic scraper knife 6 - is clamped on its foot in the clamping bar 5.

Unterhalb der an der Gegenwalze 3 anliegenden Schabermesserspitze greift eine Abstützleiste 7 an dem Schabermesser 6 an, die am Schaberbalken 4 zur Einstellung des Anpreßdruckes in etwa parallel zur Bewegungsrichtung des Klemmbalkens 5 verschiebbar gelagert ist. Die sich über die Arbeitsbreite erstreckende Abstützleiste 7 ist an der der Abstützlinie entgegengesetzten Seite in regelmäßigen Abständen geschlitzt, oder auf sonstige Weise nachgiebig ausgebildet, und daher in Grenzen biegsam, um die Einstellung eines lokal unterschiedlichen Anpreßdrucks über die Breite des Schabermessers 6 zu ermöglichen. Die Lagerung der Abstützleiste 7 am Schaberbalken 4 erfolgt über an der Rückseite in regelmäßigen Abständen - bevorzugt etwa alle 75 mm - befestigte, axial verschiebbare Bolzen 8, an denen jeweils ein Verstellmechanismus angreift, von dem in den Fig. 2 und 3 eine bevorzugte Ausgestaltung näher beschrieben ist:Below the scraper knife tip resting on the counter roller 3, a support bar 7 engages on the scraper knife 6, which on the scraper bar 4 for adjusting the contact pressure approximately parallel to the direction of movement of the clamping bar 5 is slidably mounted. The support bar 7, which extends over the working width, is slotted at regular intervals on the side opposite the support line, or is designed to be flexible in some other way, and is therefore flexible to a limited extent in order to enable the setting of a locally different contact pressure across the width of the scraper knife 6. The support bar 7 is mounted on the scraper bar 4 via axially displaceable bolts 8 which are fastened to the rear at regular intervals - preferably approximately every 75 mm - and each of which is engaged by an adjustment mechanism, a preferred embodiment of which is shown in more detail in FIGS. 2 and 3 is described:

Die sich radial von der Gegenwalze 3 erstreckenden Bolzen 8 sind mit Abstand von der Abstützleiste 7 in einer sich über die Arbeitsbreite erstreckenden Leiste 9 gelagert, wobei auf das überstehende Ende eine von der Gegenwalze 3 wegdrückende Feder 10 aufgezogen ist, deren Federkraft mit einer Schraube 11 einstellbar ist. Zwischen der Leiste 9 und der Abstützleiste 7 ist am Bolzen 8 das Ende eines zur Abstützleiste 7 im wesentlichen parallelen Hebels 12 angelenkt, dessen anderes Ende auf dem Schaberbalken 4 um den Punkt 13 drehbar befestigt ist. Am Hebel 12, im Bereich zwischen Drehpunkt 13 und der Befestigung des Bolzens 8, ist ein zu diesem im wesentlichen paralleler weiterer Bolzen 14 zur Übertragung der Druckkräfte befestigt, der ebenfalls durch die Leiste 9 hindurch verschiebbar angeordnet ist. Die Befestigungspunkte der Bolzen 8 und 14 am Hebel 12 sind so gewählt, daß ein Übersetzungsverhältnis der Bewegung des Bolzens 8 zur Bewegung des Bolzens 14 zwischen 1/1 und 10/1, bevorzugt ca. 4/1, vorliegt. Das aus der Leiste 9 herausragende Ende des Bolzens 14 ist über ein Gelenk 15 mit einem sich von der Gegenwalze 3 weg erstreckenden Piezotranslator 16 koaxial verbunden, der an seinem anderen Ende auf dem Schaberbalken 4 verschiebbar befestigt ist. An diesem Ende ist über ein Gelenk 17 ein Gleitsegment 18 angeschlossen, das auf dem Schaberbalken 4 verschiebbar aufliegt und von einer Stellschraube 19 über ein Differenzgewinde 20 in Richtung zur Gegenwalze 3 und von dieser weg positioniert werden kann.The bolts 8, which extend radially from the counter-roller 3, are mounted at a distance from the support bar 7 in a bar 9 which extends over the working width, a spring 10 pushing away from the counter-roller 3, the spring force of which is screwed with a screw 11, onto the projecting end is adjustable. Between the bar 9 and the support bar 7, the end of a lever 12 substantially parallel to the support bar 7 is articulated on the bolt 8, the other end of which is rotatably fastened on the scraper bar 4 about the point 13. On the lever 12, in the area between the pivot point 13 and the fastening of the bolt 8, a further bolt 14, which is essentially parallel to the latter, for the transmission of the compressive forces is fastened and which is likewise arranged displaceably through the strip 9. The fastening points of the bolts 8 and 14 on the lever 12 are selected so that a transmission ratio of the movement of the bolt 8 to the movement of the bolt 14 is between 1/1 and 10/1, preferably approximately 4/1. The end of the bolt 14 protruding from the strip 9 is connected via a joint 15 to a piezo translator 16 which extends away from the counter-roller 3 and is slidably attached to the scraper beam 4 at its other end. At this end, a sliding segment 18 is connected via a joint 17, which is displaceable on the scraper beam 4 rests and can be positioned by an adjusting screw 19 via a differential thread 20 in the direction of the counter roller 3 and away from it.

Alternativ zu dem vorstehend beschriebenen Hebelmechanismus können auch druckmittelbetriebene Übersetzungselemente eingesetzt werden; insbesondere läßt sich das gewünschte Übersetzungsverhältnis vorteilhaft mit hydraulisch arbeitenden Elementen realisieren.As an alternative to the lever mechanism described above, pressure-medium-operated translation elements can also be used; in particular, the desired transmission ratio can advantageously be realized with hydraulically operating elements.

Im vorliegenden Ausführungsbeispiel wird die Stellschraube 19 manuell betätigt, ebenso kann ein motorischer Antrieb angeschlossen sein.In the present exemplary embodiment, the adjusting screw 19 is operated manually, and a motor drive can also be connected.

Jeder Piezotranslator 16 ist mit einer weiter nicht dargestellten Spannungsversorgung 16.1 verbunden, deren Ausgänge in Abhängigkeit von dem im zugehörigen Bereich gemessenen Strichgewicht von einer Regeleinrichtung geregelt werden.Each piezotranslator 16 is connected to a voltage supply 16.1 (not shown), the outputs of which are regulated by a control device as a function of the line weight measured in the associated area.

Zu Beginn des Beschichtungsvorgangs erfolgt eine Grundeinstellung des Anpreßdrucks der Abstützleiste 7 an den Stellschrauben 19 für die jeweiligen Bereiche: Ein Drehen an den Stellschrauben 19 bewirkt eine Verschiebung des Gleitsegments 18, des Piezotranslators 16 und des Bolzens 18, die über den Hebel 12 und den Bolzen 8 eine vom Übersetzungsverhältnis abhängige Verschiebung der Abstützleiste 7 ergibt. Die Grundeinstellung ist so gewählt, daß die Hälfte der maximalen Spannung an den Piezotranslatoren 16 (im vorliegenden Beispiel: U max = 800 V) anliegt und die Feder 10 soweit zusammengedrückt ist, daß die Federkraft ausreicht, um die Abstützleiste 7 bei Verminderung der Spannung von der Gegenwalze 3 wegzuziehen. Dies ist erforderlich, da die Piezotranslatoren 16 in der handelsüblichen Bauform mit lediglich geringer Vorspannung nicht in der Lage sind, ausreichende Zugkräfte aufzubringen.At the beginning of the coating process, a basic setting of the contact pressure of the support bar 7 on the set screws 19 is carried out for the respective areas: turning the set screws 19 causes a displacement of the sliding segment 18, the piezo translator 16 and the pin 18, via the lever 12 and the pin 8 results in a displacement of the support bar 7 which is dependent on the transmission ratio. The basic setting is selected so that half of the maximum voltage is applied to the piezotranslators 16 (in the present example: U max = 800 V) and the spring 10 is compressed to such an extent that the spring force is sufficient to support the support bar 7 while reducing the voltage from pull the counter roller 3 away. This is necessary because the piezotranslators 16 in the commercial design with only a slight preload are not able to apply sufficient tensile forces.

Die Feineinstellung des Querprofils während der Beschichtung erfolgt über die Piezotranslatoren 16 für den jeweiligen Bereich. Dazu wird die Strichgewichtsverteilung über die Arbeitsbreite ermittelt; bei Abweichungen von einer gleichmäßigen Verteilung wird die am entsprechenden Piezotranslator 16 anliegende Spannung verändert, was eine Ausdehnung oder Kontraktion des Piezotranslators 16 in axialer Richtung bewirkt. Die Längenveränderung des Piezotranslators 16 wird von dem Hebel 12 entsprechend dem Übersetzungsverhältnis vergrößert an den Bolzen 8 übertragen, der die elastische Abstützleiste 7 in dem jeweiligen Bereich zur Gegenwalze 3 hin oder davon weg bewegt. Bei einer Kontraktion der Piezotranslatoren 16 wird die erforderliche Zugkraft an der Abstützleiste 7 von der Feder 10 aufgebracht. Ein Ansteigen bzw. Absinken des Anpreßdrucks des Schabermessers 6 bewirkt die gewünschte Verminderung bzw. Erhöhung des Strichgewichts im jeweiligen Bereich.The fine adjustment of the cross profile during the coating takes place via the piezotranslators 16 for the respective area. For this purpose, the weight distribution is determined over the working width; in the event of deviations from a uniform distribution, the voltage present at the corresponding piezo translator 16 is changed, which causes the piezo translator 16 to expand or contract in the axial direction. The change in length of the piezotranslator 16 is transmitted from the lever 12, in accordance with the transmission ratio, to the bolt 8, which moves the elastic support strip 7 in the respective region toward the counter-roller 3 or away from it. When the piezotranslators 16 contract, the required tensile force is applied to the support bar 7 by the spring 10. An increase or decrease in the contact pressure of the doctor knife 6 brings about the desired reduction or increase in the coating weight in the respective area.

Claims (7)

  1. Device for coating a material strip (2) guided around a counter-roller (3), having a doctor blade (6) which can be pressed against the counter-roller (3) and having adjusting elements for influencing the contact pressure, which adjusting elements, disposed across the width of the blade, act upon individual regions of the doctor blade (6), characterised in that, as adjusting elements, piezotranslators (16) are used.
  2. Device according to Claim 1, characterised in that the piezotranslators (16) act, in an individually controllable manner, upon a flexible supporting strip (7), which bears beneath the doctor blade tip against the doctor blade (6).
  3. Device according to Claim 1 or 2, characterised in that the piezotranslators (16) act upon the doctor blade (6) indirectly via translation elements, in particular via a lever mechanism (8, 12-14) or via elements driven by a pressure medium, having a path-translation ratio greater than 1.
  4. Device according to Claim 3, characterised in that the ratio of the length alteration of the piezotranslator (16) to the path of adjustment of the doctor blade (6) at its point of application is less than 10:1, preferably about 4:1.
  5. Device according to one of Claims 1 to 4, characterised by a spring (10) which counteracts the contact pressure of the doctor blade (6) against the counter-roller (3) by means of the piezotranslator (16).
  6. Device according to Claim 5, characterised by means (11) for adjusting the counter-force of the spring (10).
  7. Device according to one of Claims 1 to 6, characterised in that the piezotranslators (16) are mounted, in order to set a basic position of the doctor blade (6), displaceably in the direction of the counter-roller (3).
EP90110856A 1989-08-18 1990-06-08 Apparatus for coating a webmaterial moving around a counter roll Expired - Lifetime EP0418476B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90110856T ATE94781T1 (en) 1989-08-18 1990-06-08 DEVICE FOR COATING A MATERIAL WEB FEED AROUND A COUNTER ROLLER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3927329A DE3927329A1 (en) 1989-08-18 1989-08-18 DEVICE FOR COATING A MATERIAL RAIL THROUGH A COUNTER ROLLER
DE3927329 1989-08-18

Publications (3)

Publication Number Publication Date
EP0418476A2 EP0418476A2 (en) 1991-03-27
EP0418476A3 EP0418476A3 (en) 1991-11-27
EP0418476B1 true EP0418476B1 (en) 1993-09-22

Family

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Application Number Title Priority Date Filing Date
EP90110856A Expired - Lifetime EP0418476B1 (en) 1989-08-18 1990-06-08 Apparatus for coating a webmaterial moving around a counter roll

Country Status (8)

Country Link
US (1) US5081951A (en)
EP (1) EP0418476B1 (en)
JP (1) JPH0394867A (en)
AT (1) ATE94781T1 (en)
BR (1) BR9004072A (en)
CA (1) CA2018990A1 (en)
DE (2) DE3927329A1 (en)
FI (1) FI904076A0 (en)

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EP0922500A2 (en) 1997-12-12 1999-06-16 Voith Sulzer Papiertechnik Patent GmbH Doctoring apparatus

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DE4207731A1 (en) * 1992-03-11 1993-09-16 Jagenberg Ag SUPPORT BAR FOR A COATING DEVICE
WO1993020275A1 (en) * 1992-03-31 1993-10-14 Minnesota Mining And Manufacturing Company Roll gap controller
DE4334556A1 (en) * 1993-10-11 1995-04-13 Jagenberg Ag Device for coating a material web, in particular a paper or cardboard web
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DE19627489A1 (en) * 1996-07-08 1998-01-15 Voith Sulzer Papiermasch Gmbh Web coating applicator
DE19627470A1 (en) * 1996-07-08 1998-01-15 Voith Sulzer Papiermasch Gmbh Web coating applicator for use in coating web of paper or fabric
DE19715117A1 (en) * 1997-04-11 1998-10-15 Voith Sulzer Papiermasch Gmbh Assembly to coat a moving web
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP0922500A2 (en) 1997-12-12 1999-06-16 Voith Sulzer Papiertechnik Patent GmbH Doctoring apparatus
US6203615B1 (en) 1997-12-12 2001-03-20 Voith Sulzer Papiertechnik Patent Gmbh Doctoring device

Also Published As

Publication number Publication date
EP0418476A2 (en) 1991-03-27
DE3927329A1 (en) 1991-02-21
JPH0394867A (en) 1991-04-19
CA2018990A1 (en) 1991-02-18
BR9004072A (en) 1991-09-03
FI904076A0 (en) 1990-08-17
EP0418476A3 (en) 1991-11-27
DE59002829D1 (en) 1993-10-28
US5081951A (en) 1992-01-21
ATE94781T1 (en) 1993-10-15

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