EP0583434B1 - Device for applying coating material to a moving material web - Google Patents

Device for applying coating material to a moving material web Download PDF

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Publication number
EP0583434B1
EP0583434B1 EP93902130A EP93902130A EP0583434B1 EP 0583434 B1 EP0583434 B1 EP 0583434B1 EP 93902130 A EP93902130 A EP 93902130A EP 93902130 A EP93902130 A EP 93902130A EP 0583434 B1 EP0583434 B1 EP 0583434B1
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EP
European Patent Office
Prior art keywords
web
metering
coating material
gap
axis
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
EP93902130A
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German (de)
French (fr)
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EP0583434A1 (en
Inventor
Gerhard Wohlfeil
Herbert Sommer
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Jagenberg AG
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Jagenberg AG
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Publication of EP0583434A1 publication Critical patent/EP0583434A1/en
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    • 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

Definitions

  • the invention relates to a device for applying coating material to a running material web, in particular a paper or cardboard web, according to the preamble of patent claim 1.
  • devices For coating running webs of material, in particular paper or cardboard webs, devices are known with a counter roll deflecting the web, an application system with a metering element for setting the desired application weight being arranged in the wrapping area of the counter roll.
  • the surface of the metering element which extends over the working width, forms with the counter-roller an application gap converging in the direction of web travel, via which the coating material is guided to the web.
  • the desired application weight can be set via the gap width at the narrowest point of the application gap, which is referred to as the metering line.
  • a device is known with an application roller scooping from a liquid chamber, which forms an application gap with the counter roller.
  • An inelastically supported pre-metering device which extends into the area of the application gap and delimits it in the form of a chamber on the outlet side, forms a pre-metering gap with the counter roller, with an outflow channel remaining free to the application roller.
  • DE-OS 36 20 374 describes a generic device without scooping application roller, in which the coating material is pumped into the converging gap between the counter roller and a doctor element via a channel.
  • Rotating doctor bars or cross-sectionally shaped distribution elements are provided as doctor elements, which can be pressed against the counter-roller in an elastically supported manner in order to be able to adjust the line pressure on the metering line.
  • the invention has for its object to improve a generic device for applying coating material so that different coating materials at high web speeds can be applied evenly and trouble-free even with low application weights.
  • the converging application gap for adjusting the hydrodynamic pressure and the gap width on the metering line can be changed.
  • the edge with the small radius on the dosing line prevents film splitting from occurring and thus leads to a more even application.
  • the metering element is supported on a cylindrical support element parallel to the counter-roller axis and pivotable about an axis which extends coaxially to the cylinder axis of the support element.
  • the support element is a driven, coating material in the application gap promoting roller, which takes over the function of a pump, via the rotational speed of the flow rate to the metering / pre-metering gap can be influenced.
  • the rotatable doctor rod on the metering line according to claim 6 ensures longer service life and self-cleaning of the metering / pre-metering element, since it has significantly less wear and tear than a fixed metering element subject to.
  • the inelastic support of the metering element according to claim 7 enables the setting of a certain gap width on the metering line regardless of the hydrodynamic pressure.
  • a certain hydrodynamic pressure can also be set, then the metering element is pressed against the counter roller at a preselected pressure.
  • the ink feed in the application gap is calmed by the guide plate arranged in front of the metering element in the web running direction. This ensures an even application and thus enables the pressure in the application gap to be reduced without uncovered spots on the web.
  • the application device has a driven counter roller 1, from which the material web 2 - a paper or cardboard web with a width of 8 m and more - is deflected.
  • a cylindrical support element 3 parallel to the counter-roller 1 is arranged at a distance therefrom Intermediate space between the support element 3 and the counter-roller 1 supports dosing element 4.
  • the surface 6 of the metering element 4 facing the counter roller 1 forms with the counter roller 1 an application gap converging in the web running direction, the gap width of which at the narrowest point (metering line 7) is less than 2 mm.
  • the elements described above (counter roller 1, support element 3, metering element 4, feed channel 5) extend over the entire working width, ie the width of the web 2, with the cross section remaining the same.
  • the length of the surface 6 of the metering element 4 as far as the metering line 7 measured in the direction of web travel between 5 mm and 50 mm.
  • the metering element 4 is rigidly attached to the outer surface of the support element 3. Its surface 6 guiding the coating color extends in the web running direction (in the figures from left to right) approximately tangentially with increasing distance from the outer surface of the support element 3. In the embodiment according to FIG. 1, this is implemented constructively by a metering element 4 which is wedge-shaped in cross section, in the embodiment according to FIG. 2 by a scraper knife 8 which is correspondingly fastened and supported on the outer surface of the support element 3.
  • the support element 3 is mounted so as to be pivotable within limits about a pivot axis 9.
  • the pivoting takes place by means of two levers 10, each fastened to the end faces of the support element 3, which can be pivoted by means of two pneumatic cylinders 11, 12 adjustable in the opposite direction. Since the distance 13 of the surface 6, referred to as radius 13, increases continuously from the pivot axis 9 of the metering element 6 in the web running direction to the metering line 7, both the geometry of the application gap formed by it together with the counter roller 1 and the width of the gap on the Set metering line 7 by swiveling the support element 3.
  • the pivoting movement of the metering element 4 in the counterclockwise direction, in which the gap width at the metering line 7 is reduced, is limited by a mechanical stop 14, so that the minimum gap width is not undershot.
  • a certain hydrodynamic pressure can be set, the gap width being variable. A certain pressure is then set in the pneumatic cylinder 12 without a mechanical stop, for which a corresponding hydrodynamic pressure builds up in the application gap.
  • the metering element 4 dodges and opens the application gap; e.g. B. when passing through a thickened adhesive point of the paper web.
  • the support element 3 is preferably designed as a double-walled hollow body through which a cooling liquid flows. In this way, thermal deformations that would be transferred to the metering element 4 are avoided. Cooling also reduces the build-up of coating color.
  • the support element 3 can be made relatively slim. In the case of large working widths, it is supported on its underside to avoid bending. As shown in FIG. 1, this is expediently carried out with a continuous bar 15 which is pressed against the underside by means of a series of adjusting screws 16.
  • the surface 6 of the dosing element 4 ends at the dosing line 7 with an edge whose radius is less than 8 mm.
  • the edge thus forms an abrupt end of the application gap on the metering line 7 in order to keep the forces on the coating color acting radially away from the counter roller 1 as low as possible.
  • a guide plate 17 is arranged, which, adapted to the circumferential surface of the support element 3, extends at a distance from it and thus forms the feed channel 5 of the coating color into the application gap.
  • the baffle 17 extends into the application gap or ends at a short distance in front of the metering element 4.
  • the coating color is pumped into the feed channel 5 with an adjustable pump 18 in excess.
  • the Excess quantity runs back through the guide plate 17 from the incoming coating color against the web running direction via the rear side 19 into a collecting trough 20.
  • the support element consists of a driven roller 21 which conveys the coating color into the application gap.
  • an additional final metering device 22 is arranged, which contains a doctor blade 23 as the final metering element, which can be adjusted in a known manner Angle and contact pressure against the web 2 guided by the counter roll 1 can be pressed.
  • the coating knife scraped off by the doctor knife 23 runs back into an ink pan 24 arranged below the application roller 21, from which it is conveyed into the application gap together with freshly supplied coating ink.
  • a guide plate 17 is also arranged on the web inlet side and separates the inlet from the returning excess in the manner described above.
  • the area of the application gap with the metering element 6 is shown enlarged in FIG. 4:
  • the metering element 4 is also wedge-shaped in cross section and ends at the metering line 7 in a sharp edge. However, it is not attached to the applicator roller 21, but only supported on it.
  • the application roller 21 rotates under the metering element to convey coating color into the application gap.
  • the gap width at the metering line is a maximum of 2 mm and the length of the surface 6 of the metering element guiding the coating color up to the metering line 7 is between 5 mm and 50 mm.
  • the guide plate 17 extends into the vicinity of the application gap, the distance of its end from the metering line is a maximum of 80 mm.
  • the dosing element 4 is attached to the end of a pivot lever 25 which is pivotably mounted about the axis of rotation 26 of the application roller 21 in order to be able to adjust the geometry of the application gap in the manner described in the embodiment according to FIG. 1.
  • FIG. 5 also shows an embodiment with an application roller 21 which conveys the coating color into the feed channel 5.
  • the metering element 4 is, as described in the embodiment according to FIGS. 3 and 4, pivotably mounted about the axis of rotation 26 of the application roller 21. It has a wedge-shaped inlet flank, which forms the feed channel 5 with the guide plate 17.
  • a holder 27 for a rotatable doctor rod 28 is fitted into the metering element 4.
  • the outer surface of the driven doctor rod 29 is either smooth or has elevations and depressions; preferably in the form of circumferential grooves which, for. B. were generated by wrapping with a wire or by incorporating annular or spiral grooves.
  • the circumference of the doctor rod 28 is tangential to the inlet flank, so that the tear-off edge on the metering line 7 is formed by it.
  • the radius of the doctor rod 28 is a maximum of 8 mm, it is expediently driven by the drive of the application roller 21.
  • the embodiment according to FIG. 5 has the advantage that the wear of the rotatable doctor rod at the critical point, namely the metering line 7, is considerably less than that of a metering element which is rigid in this area. Furthermore, the doctor rod 28 can be easily replaced when worn.

Abstract

Devices for applying coating material to a moving material web (2), especially a paper or cardboard web, are known which comprise a mating roll (1) reversing the material web (2), a metering unit (4), the surface of which forms a convergent application gap with the mating roll (1) in the direction of movement of the web, and means for feeding coating material into the application gap. In order to be able to apply different coating materials evenly and without problems at high web speeds even at low coating weights, according to the invention the metering unit (4) is fitted to pivot about an axis (9, 26) parallel to that of the mating roll, the radius (13) of its surface (6) guiding the coating material increases continuously in the direction of travel of the web as far as the metering line (7) and the surface (6) terminates at the metering line (7) in an edge, the radius of which is smaller than 8 mm.

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Vorrichtung zum Auftragen von Beschichtungsmaterial auf eine laufende Materialbahn, insbesondere eine Papier- oder Kartonbahn, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for applying coating material to a running material web, in particular a paper or cardboard web, according to the preamble of patent claim 1.

Zum Beschichten von laufenden Materialbahnen, insbesondere Papier- oder Kartonbahnen, sind Vorrichtungen mit einer die Bahn umlenkenden Gegenwalze bekannt, wobei im Umschlingungsbereich der Gegenwalze ein Auftragsystem mit einem Dosierelement zur Einstellung des gewünschten Auftraggewichts angeordnet ist. Die Oberfläche des sich über die Arbeitsbreite erstreckenden Dosierelements bildet mit der Gegenwalze einen in Bahnlaufrichtung konvergierenden Auftragspalt, über den das Beschichtungsmaterial an die Bahn geführt wird. Das gewünschte Auftraggewicht läßt sich über die Spaltweite an der engsten Stelle des Auftragspalts, die als Dosierlinie bezeichnet wird, einstellen. Um die Strichqualität zu verbessern und/oder das Strichgewicht zu verringern (= aufgetragene Menge an Beschichtungsmaterial pro Quadratmeter Bahnfläche), ist es bekannt, hinter dem Auftragsystem ein zusätzliches Dosiersystem anzuordnen, das die vordosiert und im Überschuß aufgetragene Menge an Beschichtungsmaterial bis auf das gewünschte Strichgewicht wieder abstreift, z. B. mit einem Schabermesser.For coating running webs of material, in particular paper or cardboard webs, devices are known with a counter roll deflecting the web, an application system with a metering element for setting the desired application weight being arranged in the wrapping area of the counter roll. The surface of the metering element, which extends over the working width, forms with the counter-roller an application gap converging in the direction of web travel, via which the coating material is guided to the web. The desired application weight can be set via the gap width at the narrowest point of the application gap, which is referred to as the metering line. To improve the line quality and / or reduce the line weight (= applied amount of coating material per square meter Web area), it is known to arrange an additional metering system behind the application system, which strips the pre-metered and excess amount of coating material down to the desired coat weight, e.g. B. with a doctor knife.

Stand der TechnikState of the art

Aus der DE-OS 39 16 620 ist eine Vorrichtung mit einer aus einer Flüssigkeitskammer schöpfenden Auftragwalze bekannt, die mit der Gegenwalze einen Auftragspalt bildet. Eine unelastisch abgestützte Vordosiereinrichtung, die bis in den Bereich des Auftragsspalts reicht und diesen auslaufseitig kammerförmig begrenzt, bildet mit der Gegenwalze einen Vordosierspalt, wobei zur Auftragwalze ein Abströmkanal freibleibt.From DE-OS 39 16 620 a device is known with an application roller scooping from a liquid chamber, which forms an application gap with the counter roller. An inelastically supported pre-metering device, which extends into the area of the application gap and delimits it in the form of a chamber on the outlet side, forms a pre-metering gap with the counter roller, with an outflow channel remaining free to the application roller.

Die DE-OS 36 20 374 beschreibt eine gattungsgemäße Vorrichtung ohne schöpfende Auftragwalze, bei der das Beschichtungsmaterial in den konvergierenden Spalt zwischen der Gegenwalze und einem Rakelelement über einen Kanal gepumpt wird. Als Rakelelemente sind rotierende Rakelstäbe oder im Querschnitt bogenartig geformte Verteilungselemente vorgesehen, die elastisch abgestützt gegen die Gegenwalze andrückbar sind, um den Liniendruck an der Dosierlinie einstellen zu können.DE-OS 36 20 374 describes a generic device without scooping application roller, in which the coating material is pumped into the converging gap between the counter roller and a doctor element via a channel. Rotating doctor bars or cross-sectionally shaped distribution elements are provided as doctor elements, which can be pressed against the counter-roller in an elastically supported manner in order to be able to adjust the line pressure on the metering line.

Beim Beschichten von saugfähigen Papier- oder Kartonbahnen ist es erforderlich, das Beschichtungsmaterial, üblicherweise Streichfarbe in wässriger Lösung, mit möglichst geringem Druck an die Bahn heranzuführen, um ein unerwünschtes Eindringen in die Bahn zu verhindern. Dabei muß gewährleistet sein, daß die Streichfarbe gleichmäßig verteilt wird, insbesondere keine unbedeckten Stellen auftreten. Falls nach dem Auftragen ein zusätzliches Enddosiersystem angeordnet ist, soll auch der Überschußauftrag möglichst gleichmäßig und so gering wie möglich sein. Dies bei verschiedenen Streichfarbenzusammensetzungen ohne störende Nebeneffekte wie Filmsplitting, hoher Verschleiß etc. zu erreichen, erweist sich bei zunehmenden Bahngeschwindigkeiten in der Praxis als schwierig.When coating absorbent paper or cardboard webs, it is necessary to apply the coating material, usually coating color in aqueous solution, to the web with as little pressure as possible in order to prevent undesired penetration into the web. It must be ensured that the coating color is evenly distributed, especially that no uncovered areas occur. If an additional final dosing system is arranged after application, the excess application should also be as uniform and as low as possible. To achieve this with different coating color compositions without annoying side effects such as film splitting, high wear, etc., proves to be difficult in practice with increasing web speeds.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung zum Auftragen von Beschichtungsmaterial so zu verbessern, daß verschiedene Beschichtungsmaterialien bei hohen Bahngeschwindigkeiten gleichmäßig und störungsfrei auch mit geringen Auftragsgewichten aufgetragen werden können.The invention has for its object to improve a generic device for applying coating material so that different coating materials at high web speeds can be applied evenly and trouble-free even with low application weights.

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

Nach der Erfindung läßt sich der konvergierende Auftragspalt zur Einstellung des hydrodynamischen Drucks und der Spaltweite an der Dosierlinie verändern. Die Kante mit dem geringen Radius an der Dosierlinie vermeidet das Auftreten von Filmsplitting und führt somit zu einem gleichmäßigeren Auftrag.According to the invention, the converging application gap for adjusting the hydrodynamic pressure and the gap width on the metering line can be changed. The edge with the small radius on the dosing line prevents film splitting from occurring and thus leads to a more even application.

Die Unteransprüche enthalten bevorzugte, da besonders vorteilhafte Ausgestaltungen einer erfindungsgemäßen Vorrichtung.The subclaims contain preferred, since particularly advantageous, configurations of a device according to the invention.

Nach Patentanspruch 2 ist das Dosierelement auf einem zur Gegenwalzenachse parallelen, zylinderförmigen Tragelement abgestützt und um eine Achse schwenkbar, die koaxial zur Zylinderachse des Tragelements verläuft. Diese Lösung ist konstruktiv vorteilhaft, sie kann insbesondere nachträglich in bestehende Anlagen mit einer Auftragwalze eingebaut werden.According to claim 2, the metering element is supported on a cylindrical support element parallel to the counter-roller axis and pivotable about an axis which extends coaxially to the cylinder axis of the support element. This solution is structurally advantageous, it can be retrofitted to existing systems with an application roller.

Bei der Ausführungsform nach Patentanspruch 3 ist das Tragelement eine angetriebene, Beschichtungsmaterial in den Auftragspalt fördernde Walze, die die Funktion einer Pumpe übernimmt, über deren Drehgeschwindigkeit die Fördermenge zum Dosier-/Vordosierspalt beeinflußt werden kann.In the embodiment according to claim 3, the support element is a driven, coating material in the application gap promoting roller, which takes over the function of a pump, via the rotational speed of the flow rate to the metering / pre-metering gap can be influenced.

Während die Patentansprüche 4 und 5 Merkmale enthalten, die sich für einen gleichmäßigen Auftrag als vorteilhaft gezeigt haben, gewährleistet die drehbare Rakelstange an der Dosierlinie nach Anspruch 6 längere Standzeiten und eine Selbstreinigung des Dosier-/Vordosierelementes, da sie erheblich geringerem Verschleiß als ein feststehendes Dosierelement unterliegt.While the claims 4 and 5 contain features that have been shown to be advantageous for a uniform application, the rotatable doctor rod on the metering line according to claim 6 ensures longer service life and self-cleaning of the metering / pre-metering element, since it has significantly less wear and tear than a fixed metering element subject to.

Die unelastische Abstützung des Dosierelements nach Anspruch 7 ermöglicht die Einstellung einer bestimmten Spaltweite an der Dosierlinie unabhängig vom hydrodynamischen Druck. Alternativ kann auch ein bestimmter hydrodynamischer Druck eingestellt werden, dann wird das Dosierelement mit einem vorgewählten Druck gegen die Gegenwalze gepreßt.The inelastic support of the metering element according to claim 7 enables the setting of a certain gap width on the metering line regardless of the hydrodynamic pressure. Alternatively, a certain hydrodynamic pressure can also be set, then the metering element is pressed against the counter roller at a preselected pressure.

Durch das in Bahnlaufrichtung vor dem Dosierelement angeordnete Leitblech nach Patentanspruch 8 wird die Farbzuführung im Auftragspalt beruhigt. Dies sichert einen gleichmäßigen Auftrag und ermöglicht so den Druck im Auftragspalt zu vermindern, ohne daß unbedeckte Stellen auf der Bahn entstehen.The ink feed in the application gap is calmed by the guide plate arranged in front of the metering element in the web running direction. This ensures an even application and thus enables the pressure in the application gap to be reduced without uncovered spots on the web.

Kurze Beschreibung der ZeichnungBrief description of the drawing

Die Zeichnung dient zur Erläuterung der Erfindung anhand vereinfacht dargestellter Ausführungsbeispiele. Es zeigen:

Fig. 1
die Seitenansicht einer Vorrichtung mit einem keilförmigen Dosierelement, das auf einem schwenkbaren zylindrischen Tragelement befestigt ist,
Fig. 2
zeigt eine Ausführungsform mit einem abgestützten Schabermesser als Dosierelement,
Fig. 3
zeigt die Seitenansicht einer Vorrichtung mit einer schöpfenden Auftragwalze,
Fig. 4
zeigt einen vergrößerten Ausschnitt von Fig. 3,
Fig. 5
zeigt eine Vorrichtung, bei der die Dosierlinie von einer drehbaren Rakelstange begrenzt wird.
The drawing serves to explain the invention on the basis of simplified exemplary embodiments. Show it:
Fig. 1
the side view of a device with a wedge-shaped metering element which is fastened on a pivotable cylindrical support element,
Fig. 2
shows an embodiment with a supported doctor blade as a metering element,
Fig. 3
shows the side view of a device with a scooping application roller,
Fig. 4
shows an enlarged section of Fig. 3,
Fig. 5
shows a device in which the metering line is limited by a rotatable doctor rod.

Wege zur Ausführung der ErfindungWays of Carrying Out the Invention

Bei allen in der Zeichnung beschriebenen Ausführungsformen weist die Auftragsvorrichtung eine angetriebene Gegenwalze 1 auf, von der die Materialbahn 2 - eine Papier- oder Kartonbahn mit einer Breite von 8 m und mehr - umgelenkt wird. Im Umschlingungsbereich der Bahn 2 ist mit Abstand von dieser ein zur Gegenwalze 1 paralleles, zylinderförmiges Tragelement 3 angeordnet, das ein im Zwischenraum zwischen dem Tragelement 3 und der Gegenwalze 1 angeordnetes Dosierelement 4 abstützt. In Bahnlaufrichtung vor dem Dosierelement 4 befindet sich ein Zuführkanal 5, über den Beschichtungsmaterial - im vorliegenden Beispiel Streichfarbe - über die Oberfläche 6 des Dosierelements 4 an die Bahn 2 geführt wird. Die der Gegenwalze 1 zugewandte Oberfläche 6 des Dosierelements 4 bildet mit der Gegenwalze 1 einen in Bahnlaufrichtung konvergierenden Auftragspalt, dessen Spaltweite an der engsten Stelle (Dosierlinie 7) weniger als 2 mm beträgt. Die vorstehend beschriebenen Elemente (Gegenwalze 1, Tragelement 3, Dosierelement 4, Zuführkanal 5) erstrecken sich bei gleichbleibendem Querschnitt über die gesamte Arbeitsbreite, i. e. die Breite der Bahn 2. Die in Bahnlaufrichtung gemessene Länge der Oberfläche 6 des Dosierelements 4 bis zur Dosierlinie 7 beträgt zwischen 5 mm und 50 mm.In all the embodiments described in the drawing, the application device has a driven counter roller 1, from which the material web 2 - a paper or cardboard web with a width of 8 m and more - is deflected. In the wrapping area of the web 2, a cylindrical support element 3 parallel to the counter-roller 1 is arranged at a distance therefrom Intermediate space between the support element 3 and the counter-roller 1 supports dosing element 4. In the web running direction in front of the metering element 4 there is a feed channel 5, via which coating material - in the present example coating color - is guided to the web 2 via the surface 6 of the metering element 4. The surface 6 of the metering element 4 facing the counter roller 1 forms with the counter roller 1 an application gap converging in the web running direction, the gap width of which at the narrowest point (metering line 7) is less than 2 mm. The elements described above (counter roller 1, support element 3, metering element 4, feed channel 5) extend over the entire working width, ie the width of the web 2, with the cross section remaining the same. The length of the surface 6 of the metering element 4 as far as the metering line 7 measured in the direction of web travel between 5 mm and 50 mm.

Bei den Ausführungsformen nach den Fig. 1 und 2 ist das Dosierelement 4 an der Mantelfläche des Tragelements 3 starr befestigt. Seine die Streichfarbe führende Oberfläche 6 erstreckt sich in Bahnlaufrichtung (in den Fig. von links nach rechts) in etwa tangential mit zunehmendem Abstand von der Mantelfläche des Tragelements 3 weg. Bei der Ausführungsform nach Fig. 1 ist dies konstruktiv durch ein im Querschnitt keilförmiges Dosierelement 4, bei der Ausführungsform nach Fig. 2 durch ein entsprechend an der Außenfläche des Tragelements 3 befestigtes und abgestütztes Schabermesser 8 realisiert. Das Tragelement 3 ist um eine Schwenkachse 9 in Grenzen schwenkbar gelagert. Das Verschwenken erfolgt mittels zweier jeweils an den Stirnseiten des Tragelements 3 befestigter Hebel 10, die durch zwei in entgegengesetzte Richtung verstellbare Pneumatikzylinder 11, 12 verschwenkbar sind. Da sich der als Radius 13 bezeichnete Abstand der Oberfläche 6 von der Schwenkachse 9 des Dosierelements 6 in Bahnlaufrichtung bis zur Dosierlinie 7 kontinuierlich vergrößert, läßt sich sowohl die Geometrie des von ihr gemeinsam mit der Gegenwalze 1 gebildeten Auftragspalts als auch die Weite des Spalts an der Dosierlinie 7 durch Verschwenken des Tragelements 3 einstellen. Die Schwenkbewegung des Dosierelements 4 im entgegengesetzten Uhrzeigersinn, bei der die Spaltweite an der Dosierlinie 7 verringert wird, ist durch einen mechanischen Anschlag 14 begrenzt, damit eine minimale Spaltweite nicht unterschritten wird. Alternativ kann ein bestimmter hydrodynamischer Druck eingestellt werden, wobei die Spaltweite variabel ist. Dann wird ohne einen mechanischen Anschlag im Pneumatikzylinder 12 ein bestimmter Druck eingestellt, zu dem sich ein entsprechender hydrodynamischer Druck im Auftragspalt aufbaut.In the embodiments according to FIGS. 1 and 2, the metering element 4 is rigidly attached to the outer surface of the support element 3. Its surface 6 guiding the coating color extends in the web running direction (in the figures from left to right) approximately tangentially with increasing distance from the outer surface of the support element 3. In the embodiment according to FIG. 1, this is implemented constructively by a metering element 4 which is wedge-shaped in cross section, in the embodiment according to FIG. 2 by a scraper knife 8 which is correspondingly fastened and supported on the outer surface of the support element 3. The support element 3 is mounted so as to be pivotable within limits about a pivot axis 9. The pivoting takes place by means of two levers 10, each fastened to the end faces of the support element 3, which can be pivoted by means of two pneumatic cylinders 11, 12 adjustable in the opposite direction. Since the distance 13 of the surface 6, referred to as radius 13, increases continuously from the pivot axis 9 of the metering element 6 in the web running direction to the metering line 7, both the geometry of the application gap formed by it together with the counter roller 1 and the width of the gap on the Set metering line 7 by swiveling the support element 3. The pivoting movement of the metering element 4 in the counterclockwise direction, in which the gap width at the metering line 7 is reduced, is limited by a mechanical stop 14, so that the minimum gap width is not undershot. Alternatively, a certain hydrodynamic pressure can be set, the gap width being variable. A certain pressure is then set in the pneumatic cylinder 12 without a mechanical stop, for which a corresponding hydrodynamic pressure builds up in the application gap.

Falls der Druck im Auftragspalt den vom Pneumatikzylinder 12 aufgebrachten Druck übersteigt, weicht das Dosierelement 4 aus und öffnet den Auftragspalt; z. B. beim Durchlauf einer verdickten Klebestelle der Papierbahn.If the pressure in the application gap exceeds the pressure applied by the pneumatic cylinder 12, the metering element 4 dodges and opens the application gap; e.g. B. when passing through a thickened adhesive point of the paper web.

Damit der Auftragspalt über die Arbeitsbreite mit gleichmäßigem Querschnitt verläuft, ist das Tragelement 3 vorzugsweise als doppelwandiger Hohlkörper ausgebildet, der von einer Kühlflüssigkeit durchflossen ist. So werden thermische Verformungen, die sich auf das Dosierelement 4 übertragen würden, vermieden. Gleichfalls wird durch die Kühlung ein Ansetzen von Streichfarbe reduziert. Im Gegensatz zu den bekannten Auftragwalzen kann das Tragelement 3 relativ schlank ausgebildet werden. Bei großen Arbeitsbreiten wird es an seiner Unterseite zur Vermeidung von Durchbiegungen unterstützt. Wie in Fig. 1 dargestellt, erfolgt dies zweckmäßigerweise mit einer durchgehenden Leiste 15, die mittels einer Reihe von Einstellschrauben 16 gegen die Unterseite gedrückt wird.So that the application gap extends over the working width with a uniform cross section, the support element 3 is preferably designed as a double-walled hollow body through which a cooling liquid flows. In this way, thermal deformations that would be transferred to the metering element 4 are avoided. Cooling also reduces the build-up of coating color. In contrast to the known applicator rollers, the support element 3 can be made relatively slim. In the case of large working widths, it is supported on its underside to avoid bending. As shown in FIG. 1, this is expediently carried out with a continuous bar 15 which is pressed against the underside by means of a series of adjusting screws 16.

Die Oberfläche 6 des Dosierelements 4 endet an der Dosierlinie 7 mit einer Kante, deren Radius weniger als 8 mm beträgt. Die Kante bildet so ein abruptes Ende des Auftragspalts an der Dosierlinie 7, um die radial von der Gegenwalze 1 weg wirkenden Kräfte auf die Streichfarbe möglichst gering zu halten. Diese Kräfte führen zu dem nachteiligen Filmsplitting-Effekt, der die Gleichmäßigkeit des Auftrags negativ beeinflußt.The surface 6 of the dosing element 4 ends at the dosing line 7 with an edge whose radius is less than 8 mm. The edge thus forms an abrupt end of the application gap on the metering line 7 in order to keep the forces on the coating color acting radially away from the counter roller 1 as low as possible. These forces lead to the disadvantageous film splitting effect, which negatively affects the uniformity of the application.

In Bahnlaufrichtung vor dem Dosierelement 4 ist ein Leitblech 17 angeordnet, das der Mantelfläche des Tragelements 3 angepaßt gekrümmt mit Abstand von dieser verläuft und so mit dieser den Zuführkanal 5 der Streichfarbe in den Auftragspalt bildet. Das Leitblech 17 reicht bis in den Auftragspalt oder endet mit geringem Abstand vor dem Dosierelement 4. Die Streichfarbe wird in den Zuführkanal 5 mit einer regelbaren Pumpe 18 im Überschuß gepumpt. Die überschüssige Menge läuft durch das Leitblech 17 von der zulaufenden Streichfarbe getrennt gegen die Bahnlaufrichtung über die Rückseite 19 in eine Auffangwanne 20 zurück. Durch die Trennung der zulaufenden von der rücklaufenden Streichfarbe beruhigt sich die Strömung im Auftragspalt 6 erheblich, so daß der Druck abgesenkt werden kann, ohne daß unbedeckte Stellen entstehen.In the web running direction in front of the metering element 4, a guide plate 17 is arranged, which, adapted to the circumferential surface of the support element 3, extends at a distance from it and thus forms the feed channel 5 of the coating color into the application gap. The baffle 17 extends into the application gap or ends at a short distance in front of the metering element 4. The coating color is pumped into the feed channel 5 with an adjustable pump 18 in excess. The Excess quantity runs back through the guide plate 17 from the incoming coating color against the web running direction via the rear side 19 into a collecting trough 20. By separating the incoming and the returning coating color, the flow in the application gap 6 calms down considerably, so that the pressure can be reduced without uncovered areas.

Bei der in Fig. 3 gezeigten Ausführungsform besteht das Tragelement aus einer angetriebenen, die Streichfarbe in den Auftragspalt fördernden Walze 21. Im Anschluß an die Auftragsvorrichtung ist eine zusätzliche Enddosiereinrichtung 22 angeordnet, die als Enddosierelement ein Schabermesser 23 enthält, das auf bekannte Weise mit einstellbarem Winkel und Anpreßdruck gegen die von der Gegenwalze 1 geführte Bahn 2 anpreßbar ist. Die vom Schabermesser 23 abgerakelte Streichfarbe läuft in eine unterhalb der Auftragwalze 21 angeordnete Farbwanne 24 zurück, aus der sie gemeinsam mit frisch zugeführter Streichfarbe in den Auftragspalt gefördert wird. An der Bahneinlaufseite ist ebenfalls ein Leitblech 17 angeordnet, der auf vorstehend beschriebene Weise den Zulauf von dem rücklaufenden Überschuß trennt. Der Bereich des Auftragspalts mit dem Dosierelement 6 ist in Fig. 4 vergrößert dargestellt:In the embodiment shown in Fig. 3, the support element consists of a driven roller 21 which conveys the coating color into the application gap. Following the application device, an additional final metering device 22 is arranged, which contains a doctor blade 23 as the final metering element, which can be adjusted in a known manner Angle and contact pressure against the web 2 guided by the counter roll 1 can be pressed. The coating knife scraped off by the doctor knife 23 runs back into an ink pan 24 arranged below the application roller 21, from which it is conveyed into the application gap together with freshly supplied coating ink. A guide plate 17 is also arranged on the web inlet side and separates the inlet from the returning excess in the manner described above. The area of the application gap with the metering element 6 is shown enlarged in FIG. 4:

Das Dosierelement 4 ist ebenfalls im Querschnitt keilförmig und endet an der Dosierlinie 7 in einer scharfen Kante. Es ist jedoch nicht auf der Auftragwalze 21 befestigt, sondern nur auf dieser abgestützt. Die Auftragwalze 21 dreht sich unter dem Dosierelement, um Streichfarbe in den Auftragspalt zu fördern. Auch bei dieser Ausführungsform beträgt die Spaltweite an der Dosierlinie maximal 2 mm und die Länge der die Streichfarbe führenden Oberfläche 6 des Dosierelements bis zur Dosierlinie 7 beträgt zwischen 5 mm und 50 mm. Das Leitblech 17 reicht bis in die Nähe des Auftragspalts, der Abstand seines Endes von der Dosierlinie beträgt maximal 80 mm. Das Dosierelement 4 ist am Ende eines Schwenkhebels 25 befestigt, der um die Drehachse 26 der Auftragwalze 21 schwenkbar gelagert ist, um auf die bei der Ausführungsform nach Fig. 1 beschriebene Weise die Geometrie des Auftragspalts einstellen zu können.The metering element 4 is also wedge-shaped in cross section and ends at the metering line 7 in a sharp edge. However, it is not attached to the applicator roller 21, but only supported on it. The application roller 21 rotates under the metering element to convey coating color into the application gap. In this embodiment, too, the gap width at the metering line is a maximum of 2 mm and the length of the surface 6 of the metering element guiding the coating color up to the metering line 7 is between 5 mm and 50 mm. The guide plate 17 extends into the vicinity of the application gap, the distance of its end from the metering line is a maximum of 80 mm. The dosing element 4 is attached to the end of a pivot lever 25 which is pivotably mounted about the axis of rotation 26 of the application roller 21 in order to be able to adjust the geometry of the application gap in the manner described in the embodiment according to FIG. 1.

Fig. 5 zeigt ebenfalls eine Ausführungsform mit einer die Streichfarbe in den Zuführkanal 5 fördernden Auftragwalze 21. Das Dosierelement 4 ist - wie bei der Ausführungsform nach den Fig. 3 und 4 beschrieben - um die Drehachse 26 der Auftragwalze 21 schwenkbar gelagert. Es weist eine keilförmige Einlaufflanke auf, die mit dem Leitblech 17 den Zuführkanal 5 bildet. Im Bereich der Dosierlinie 7 ist in das Dosierelement 4 ein Halter 27 für eine drehbare Rakelstange 28 eingepaßt. Die Mantelfläche der angetriebenen Rakelstange 29 ist entweder glatt oder weist Erhebungen und Vertiefungen auf; bevorzugt in der Form von umlaufenden Rillen, die z. B. durch Umwicklung mit einem Draht oder durch Einarbeiten von ring- oder spiralförmigen Nuten erzeugt wurden. Der Umfang der Rakelstange 28 schließt sich tangential an die Einlaufflanke an, so daß die Abrißkante an der Dosierlinie 7 von ihr gebildet wird. Um den Filmsplitting-Effekt zu verringern, beträgt der Radius der Rakelstange 28 maximal 8 mm, zweckmäßigerweise wird sie von dem Antrieb der Auftragwalze 21 mit angetrieben. Die Ausführungsform nach Fig. 5 hat den Vorteil, daß der Verschleiß der drehbaren Rakelstange an der kritischen Stelle, nämlich der Dosierlinie 7, wesentlich geringer ist als der eines in diesem Bereich starren Dosierelements. Weiterhin kann bei einem Verschleiß die Rakelstange 28 einfach ausgetauscht werden.FIG. 5 also shows an embodiment with an application roller 21 which conveys the coating color into the feed channel 5. The metering element 4 is, as described in the embodiment according to FIGS. 3 and 4, pivotably mounted about the axis of rotation 26 of the application roller 21. It has a wedge-shaped inlet flank, which forms the feed channel 5 with the guide plate 17. In the area of the metering line 7, a holder 27 for a rotatable doctor rod 28 is fitted into the metering element 4. The outer surface of the driven doctor rod 29 is either smooth or has elevations and depressions; preferably in the form of circumferential grooves which, for. B. were generated by wrapping with a wire or by incorporating annular or spiral grooves. The circumference of the doctor rod 28 is tangential to the inlet flank, so that the tear-off edge on the metering line 7 is formed by it. In order to reduce the film splitting effect, the radius of the doctor rod 28 is a maximum of 8 mm, it is expediently driven by the drive of the application roller 21. The embodiment according to FIG. 5 has the advantage that the wear of the rotatable doctor rod at the critical point, namely the metering line 7, is considerably less than that of a metering element which is rigid in this area. Furthermore, the doctor rod 28 can be easily replaced when worn.

Claims (8)

  1. Device for applying coating material to a running material web (2), especially a paper or board web, having a mating roll (1) which deflects the material web (2), and a metering element (4), which extends over the working width and whose surface, which feeds the coating material to the web (2), forms with the mating roll (1) an applicator gap converging in the web running direction, and having means for conveying coating material into the applicator gap, characterized in that the metering element (4) is mounted so as to be able to swivel about an axis (9, 26) which is parallel to the mating roll axis, the distance (13) of its surface (6) which is guiding the coating material increasing continuously from the axis (9, 26) in the web running direction as far as the narrowest point of the applicator gap, and in that the surface (6) ends at the narrowest point of the applicator gap in an edge whose radius is less than 8 mm.
  2. Device according to Claim 1, characterized in that the metering element (4) is supported on a cylindrical carrier element (3) which is parallel to the mating roll and whose axis (9, 26) extends coaxially to the swivelling axis.
  3. Device according to Claim 2, characterized in that the carrier element (3) is a driven roll (21) which conveys coating material into the applicator gap.
  4. Device according to one of Claims 1 to 3, characterized in that the gap width at the metering line (7) is less than 2 mm.
  5. Device according to one of Claims 1 to 4, characterized in that the length of the surface (6) of the metering element (4), measured in the web running direction as far as the metering line (7), is between 5 and 50 mm.
  6. Device according to one of Claims 1 to 5, characterized in that the edge at the metering line (7) is formed by a rotatable doctor rod (28).
  7. Device according to one of Claims 1 to 6, characterized in that the metering element (4) is supported inelastically.
  8. Device according to one of Claims 2 to 7, characterized in that, in the web running direction upstream of the metering element (4), there is arranged a sheet-metal guide (17) which extends over the working width, forms with the carrier element (3) a feed channel (5) for coating material and reaches into the region of the applicator gap or ends shortly before the latter.
EP93902130A 1992-02-27 1992-12-24 Device for applying coating material to a moving material web Expired - Lifetime EP0583434B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4205993A DE4205993A1 (en) 1992-02-27 1992-02-27 DEVICE FOR APPLYING COATING MATERIAL ON A RUNNING MATERIAL RAIL
DE4205993 1992-02-27
PCT/EP1992/002996 WO1993017181A1 (en) 1992-02-27 1992-12-24 Device for applying coating material to a moving material web

Publications (2)

Publication Number Publication Date
EP0583434A1 EP0583434A1 (en) 1994-02-23
EP0583434B1 true EP0583434B1 (en) 1995-09-27

Family

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Application Number Title Priority Date Filing Date
EP93902130A Expired - Lifetime EP0583434B1 (en) 1992-02-27 1992-12-24 Device for applying coating material to a moving material web

Country Status (7)

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EP (1) EP0583434B1 (en)
JP (1) JPH06507120A (en)
AT (1) ATE128501T1 (en)
DE (2) DE4205993A1 (en)
ES (1) ES2080606T3 (en)
FI (1) FI98543C (en)
WO (1) WO1993017181A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19508178A1 (en) * 1995-03-09 1996-09-12 Draiswerke Gmbh Process and plant for treating coating color when applied to a paper web
DE29506731U1 (en) * 1995-04-20 1995-06-22 Voith Sulzer Papiermasch Gmbh Application work for coating a running web, in particular made of paper or cardboard
US5665163A (en) * 1995-08-22 1997-09-09 Beloit Technologies, Inc. Film applicator with entrained air removal and surface control

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2055405B2 (en) * 1970-11-11 1973-10-04 Joseph Eck & Soehne, 4000 Duesseldorf Device for applying coating compounds to web-shaped supports
DE8522036U1 (en) * 1985-07-31 1987-03-05 Jagenberg Ag, 4000 Duesseldorf, De
FI853041A0 (en) * 1985-08-07 1985-08-07 Valmet Oy ANORDING FROM THE MATERIAL.
DE3916620A1 (en) * 1989-05-22 1990-12-06 Jagenberg Ag DEVICE FOR COATING A MATERIAL RAIL THROUGH A COUNTER ROLLER

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Publication number Publication date
JPH06507120A (en) 1994-08-11
DE59203854D1 (en) 1995-11-02
FI934734A0 (en) 1993-10-26
DE4205993A1 (en) 1993-09-02
FI98543C (en) 1997-07-10
FI98543B (en) 1997-03-27
ES2080606T3 (en) 1996-02-01
ATE128501T1 (en) 1995-10-15
FI934734A (en) 1993-10-26
WO1993017181A1 (en) 1993-09-02
EP0583434A1 (en) 1994-02-23

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