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EP0418476A2 - 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
EP0418476A2
EP0418476A2 EP90110856A EP90110856A EP0418476A2 EP 0418476 A2 EP0418476 A2 EP 0418476A2 EP 90110856 A EP90110856 A EP 90110856A EP 90110856 A EP90110856 A EP 90110856A EP 0418476 A2 EP0418476 A2 EP 0418476A2
Authority
EP
European Patent Office
Prior art keywords
piezotranslators
knife
coating
counter
roller
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
EP90110856A
Other languages
German (de)
French (fr)
Other versions
EP0418476A3 (en
EP0418476B1 (en
Inventor
Egbert Dr.-Ing. Most
Reinhard Knop
Runald Meyer
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.)
Jagenberg AG
Original Assignee
Jagenberg AG
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 Jagenberg AG filed Critical Jagenberg AG
Priority to AT90110856T priority Critical patent/ATE94781T1/en
Publication of EP0418476A2 publication Critical patent/EP0418476A2/en
Publication of EP0418476A3 publication Critical patent/EP0418476A3/en
Application granted granted Critical
Publication of EP0418476B1 publication Critical patent/EP0418476B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—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 application unit (roller or nozzle application unit) with which the coating material, e.g. 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.
  • the invention has for its object to provide a generic device in which the contact pressure of the doctor blade can be set locally different automatically during operation.
  • the piezotranslators used according to the invention have several advantages: - You are able to react very quickly to changes in the coating weight, - The high resolution of the adjustment paths in the nanometer range enables a very sensitive influence on the coating weight due to their slim design, piezo-encapsulators encapsulated against contamination can also be arranged closely next to one another for high-resolution control, - a reproducible setting of the contact pressure after production interruptions is possible, - Wear of the scraper knife tip can be compensated for during production.
  • claim 2 contains a particularly advantageous embodiment for transferring a locally different contact pressure to the doctor knife, 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 at the rear at regular intervals, preferably about 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 being pushed away from the counter-roller 3, the spring force of which is tightened with a screw 11, on 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, is fastened for the transmission of the compressive forces and which is likewise arranged displaceably through the bar 9.
  • the fastening points of the bolts 8 and 14 on the lever 12 are selected so that there is a transmission ratio of the movement of the bolt 8 to the movement of the bolt 14 between 1/1 and 10/1, preferably approximately 4/1.
  • the end of the bolt 14 protruding from the strip 9 is connected coaxially via a joint 15 to a piezotranslator 16 which extends away from the counter-roller 3 and which is displaceably fastened on the scraper bar 4 at its other end.
  • a sliding segment 18 is connected via a joint 17, which can be moved 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 line weight distribution over the working width is determined; 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)
  • Dry Shavers And Clippers (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Telephone Set Structure (AREA)
  • Replacement Of Web Rolls (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Lubricants (AREA)
  • Luminescent Compositions (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 application unit (roller or nozzle application unit) with which the coating material, e.g. 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 gattungsgemäßen Vorrichtung nach der DE-PS 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 generic device according to DE-PS 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 . An automatic control of the local distribution of the contact pressure of the doctor knife, and thus the coating weight, during the coating is not possible.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung zu schaffen, bei der der Anpreßdruck des Schabermessers während des Betriebs lokal unterschiedlich automatisch eingestellt werden kann.The invention has for its object to provide a generic device in which the contact pressure of the doctor blade can be set locally different automatically during operation.

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

Die nach der Erfindung eingesetzten Piezotranslatoren weisen mehrere Vorteile auf:
- Sie sind in der Lage, sehr schnell auf Strichgewichts­änderungen zu reagieren,
- die hohe Auflösung der Stellwege im Nanometer-Bereich ermöglicht eine sehr feinfühlige Beeinflussung des Strichgewichtes
- aufgrund ihrer schlanken Bauweise können auch gegen Verschmutzung eingekapselte Piezotranslatoren für eine Regelung mit hoher Auflösung dicht nebeneinander angeordnet werden,
- eine reproduzierbare Einstellung des Anpreßdrucks nach Produktionsunterbrechungen ist möglich,
- ein Verschleiß der Schabermesserspitze ist während der Produktion kompensierbar.The piezotranslators used according to the invention have several advantages:
- You are able to react very quickly to changes in the coating weight,
- The high resolution of the adjustment paths in the nanometer range enables a very sensitive influence on the coating weight
due to their slim design, piezo-encapsulators encapsulated against contamination can also be arranged closely next to one another for high-resolution control,
- a reproducible setting of the contact pressure after production interruptions is possible,
- Wear of the scraper knife tip can be compensated for during production.

Die Unteransprüche enthalten bevorzugte Ausgestaltungen der Erfindung.The sub-claims 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 knife, 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 using a simplified embodiment.
  • 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 is 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 at the rear at regular intervals, preferably about 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 being pushed away from the counter-roller 3, the spring force of which is tightened with a screw 11, on 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, is fastened for the transmission of the compressive forces and which is likewise arranged displaceably through the bar 9. The fastening points of the bolts 8 and 14 on the lever 12 are selected so that there is a transmission ratio of the movement of the bolt 8 to the movement of the bolt 14 between 1/1 and 10/1, preferably approximately 4/1. The end of the bolt 14 protruding from the strip 9 is connected coaxially via a joint 15 to a piezotranslator 16 which extends away from the counter-roller 3 and which is displaceably fastened on the scraper bar 4 at its other end. At this end, a sliding segment 18 is connected via a joint 17, which can be moved 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 roll 3 away. This is necessary because the piezotranslators 16 in the commercially available design with only a slight pretension 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 line weight distribution over the working width is determined; 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. Vorrichtung zum Beschichten einer um eine Gegenwalze geführten Materialbahn, mit einem an die Gegenwalze anpreßbaren Schabermesser und mit Verstellelementen zur Beeinflussung des Anpreßdrucks, die über die Messerbreite angeordnet auf einzelne Bereiche des Schabermessers einwirken,
dadurch gekennzeichnet, daß als Verstellelemente Piezotranslatoren (16) eingesetzt sind.1. Device for coating a material web guided around a counter roller, with a scraper knife that can be pressed against the counter roller and with adjusting elements for influencing the contact pressure, which act on individual areas of the doctor blade, arranged across the knife width,
characterized in that piezotranslators (16) are used as adjusting elements. 2.Vorrichtung nach Anspruch 2, dadurch gekenn­zeichnet, daß die Piezotranslatoren einzeln ansteuerbar auf eine biegsame Abstützleiste (7) einwirken, die unterhalb der Schabermesserspitze am Schabermesser (6) anliegt.2.Device according to claim 2, characterized in that the piezotranslators act individually controllable on a flexible support bar (7) which bears below the scraper knife tip on the scraper knife (6). 3.Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Piezotranslatoren (16) indirekt über Übersetzungselemente, insbesondere einem Hebelmechanismus (8, 12 - 14) oder mit einem Druckmittel betriebene Elemente, mit einem Wegübersetzungsverhältnis größer als 1 auf das Schabermesser (6) einwirken.3.Device according to claim 1 or 2, characterized in that the piezotranslators (16) indirectly via translation elements, in particular a lever mechanism (8, 12 - 14) or elements operated with a pressure medium, with a displacement ratio greater than 1 on the doctor blade (6 ) act. 4.Vorrichtung nach Anspruch 3, dadurch gekenn­zeichnet, daß das Verhältnis der Längenänderung des Piezotranslators (16) zum Verstellweg des Schabermessers (6) an dessen Angriffspunkt weniger als 10 : 1, bevorzugt ca. 4 : 1 beträgt.4.The device according to claim 3, characterized in that the ratio of the change in length of the piezotranslator (16) to the displacement of the doctor knife (6) at its point of application is less than 10: 1, preferably about 4: 1. 5.Vorrichtung nach einem der Ansprüche 1 bis 4, gekenn­zeichnet durch eine Feder (10), die dem Anpressen des Schabermessers (6) an die Gegenwalze (3) mit dem Piezotranslator (16) entgegenwirkt.5.Device according to one of claims 1 to 4, characterized by a spring (10) which counteracts the pressing of the doctor knife (6) on the counter-roller (3) with the piezotranslator (16). 6.Vorrichtung nach Anspruch 5, gekennzeichnet durch Mittel (11) zum Einstellen der Gegenkraft der Feder (10).6.Device according to claim 5, characterized by means (11) for adjusting the counterforce of the spring (10). 7.Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Piezotranslatoren (16) zur Einstellung einer Grundposition des Schabermessers (6) in Richtung zur Gegenwalze (3) verschiebbar gelagert sind.7. Device according to one of claims 1 to 6, characterized in that the piezotranslators (16) for setting a basic position of the doctor knife (6) in the direction of the counter-roller (3) are slidably mounted.
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
DE3927329 1989-08-18
DE3927329A DE3927329A1 (en) 1989-08-18 1989-08-18 DEVICE FOR COATING A MATERIAL RAIL THROUGH A COUNTER ROLLER

Publications (3)

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

Family

ID=6387388

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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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EP0651094A1 (en) * 1993-10-11 1995-05-03 Jagenberg Papiertechnik GmbH Apparatus for coating a web, particularly a paper or cardboard web
WO1995017550A1 (en) * 1993-12-21 1995-06-29 Beloit Technologies, Inc. Continuous adjustable backing bar for profiling coater blade
DE19812929A1 (en) * 1998-03-24 1999-09-30 Voith Sulzer Papiertech Patent Machine continuously metering and leveling coating of fluid or viscous material
EP2789734A1 (en) * 2013-04-09 2014-10-15 Valmet Technologies, Inc. Assembly for a device of a fiber web production line

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DE9109787U1 (en) * 1991-08-07 1991-09-26 J.M. Voith Gmbh, 7920 Heidenheim Clamping device for blades, especially in coating machines
DE4207731A1 (en) * 1992-03-11 1993-09-16 Jagenberg Ag SUPPORT BAR FOR A COATING DEVICE
US5733373A (en) * 1992-03-11 1998-03-31 Jagenberg Aktiengesellschaft Pressure strip for coating device
JPH07505334A (en) * 1992-03-31 1995-06-15 ミネソタ・マイニング・アンド・マニュファクチュアリング・カンパニー roll gap controller
US5743964A (en) * 1995-01-24 1998-04-28 Fata Hunter, Inc. Roll coating system
US5597415A (en) * 1995-02-09 1997-01-28 Voith Sulzer Paper Technology North America, Inc. Profiling bar for a web coating device
EP0821102B1 (en) * 1996-07-08 2002-03-27 Voith Paper Patent GmbH Apparatus for applying directly a fluid or pasty material onto a moving web, especially of paper or paperboard
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
DE19734718A1 (en) * 1997-08-11 1999-02-18 Voith Sulzer Papiermasch Gmbh Web coating applicator
DE19755411A1 (en) * 1997-12-12 1999-06-17 Voith Sulzer Papiertech Patent Doctor device
FI4290U1 (en) 1999-09-14 2000-01-19 Valmet Corp Paper machine scraper
US9925555B2 (en) * 2016-02-08 2018-03-27 Valmet Technologies, Inc. Folded sealing blade for a coating applicator

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EP0307618A1 (en) * 1987-09-04 1989-03-22 JAGENBERG Aktiengesellschaft Apparatus for coating a web material moving around a counter roll
FR2623743A1 (en) * 1987-11-26 1989-06-02 Reifenhaeuser Masch PROCESS FOR PRODUCING A SHEET OF THERMOPLASTIC MATERIAL USING AN ADJUSTABLE FLAT DIE

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Publication number Priority date Publication date Assignee Title
EP0651094A1 (en) * 1993-10-11 1995-05-03 Jagenberg Papiertechnik GmbH Apparatus for coating a web, particularly a paper or cardboard web
WO1995017550A1 (en) * 1993-12-21 1995-06-29 Beloit Technologies, Inc. Continuous adjustable backing bar for profiling coater blade
DE19812929A1 (en) * 1998-03-24 1999-09-30 Voith Sulzer Papiertech Patent Machine continuously metering and leveling coating of fluid or viscous material
EP2789734A1 (en) * 2013-04-09 2014-10-15 Valmet Technologies, Inc. Assembly for a device of a fiber web production line

Also Published As

Publication number Publication date
EP0418476A3 (en) 1991-11-27
US5081951A (en) 1992-01-21
CA2018990A1 (en) 1991-02-18
ATE94781T1 (en) 1993-10-15
FI904076A0 (en) 1990-08-17
BR9004072A (en) 1991-09-03
DE59002829D1 (en) 1993-10-28
EP0418476B1 (en) 1993-09-22
JPH0394867A (en) 1991-04-19
DE3927329A1 (en) 1991-02-21

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