EP0403749A2 - Coating apparatus - Google Patents

Coating apparatus Download PDF

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Publication number
EP0403749A2
EP0403749A2 EP90107008A EP90107008A EP0403749A2 EP 0403749 A2 EP0403749 A2 EP 0403749A2 EP 90107008 A EP90107008 A EP 90107008A EP 90107008 A EP90107008 A EP 90107008A EP 0403749 A2 EP0403749 A2 EP 0403749A2
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EP
European Patent Office
Prior art keywords
coating
blade
magnets
doctor
coating device
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
EP90107008A
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German (de)
French (fr)
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EP0403749B1 (en
EP0403749A3 (en
Inventor
Hans-Peter Dr. Sollinger
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JM Voith GmbH
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JM Voith GmbH
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Priority to AT90107008T priority Critical patent/ATE98529T1/en
Publication of EP0403749A2 publication Critical patent/EP0403749A2/en
Publication of EP0403749A3 publication Critical patent/EP0403749A3/en
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Publication of EP0403749B1 publication Critical patent/EP0403749B1/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

Definitions

  • the invention relates to a coating device for coating running webs, in particular made of paper or cardboard, according to the preamble of patent claim 1.
  • Such devices are widely known e.g. from DE-PS 35 30 063.
  • pressure hoses When applying pressure forces, pressure hoses are often used in coating devices. It can be used to clamp a squeegee designed as a doctor blade in the holder and also to exert pressure on the squeegee to control the thickness of the coating applied to the paper.
  • strip-shaped pressure pieces 3 used, which are adjustable by means of screws against the coating blade and thus control the contact pressure. You can use it to create the so-called cross profile of the stroke order, i.e. Control in the width or cross direction of the paper web in such a way that a line profile that is as uniform as possible, i.e. basically no profile at all, namely a uniform layer thickness.
  • the disadvantage here is that the local control of the contact pressure of the coating blade means that the contact angle ⁇ of the narrow coating edge of the coating blade on the paper web varies somewhat. This is disadvantageous in order to produce a uniform stroke application, also because the coating edge of the coating blade is ground unevenly.
  • the object of the invention in contrast, is to provide a device with which the cross profile of the stroke order can be controlled without the disadvantageous effects described.
  • a coating device has become known from AT-PS 386 762, in which magnetic forces act on a doctor element which is designed as a coating strip.
  • This doctor element is part of a larger arrangement, which also has the feed chamber for the coating slip and is suspended in an oscillating manner, so that it essentially floats on the material web or the coating slip applied thereon.
  • the scraper bar has a contour which essentially corresponds to the counter roll guiding the web or to the web guide resulting from the guidance of the web over the counter roll with partial wrapping around the same. It is not a question of an unchangeability of the position of the coating element in relation to the material web, but on the contrary, the coating effect is brought about here by a displacement of the coating strip while pivoting the entire coating arrangement comprising it.
  • the web is denoted by C, on which the doctor blade 1 rests with a contact pressure set by setting the doctor beam 13, 14.
  • This contact pressure can be generated by, for example, pivoting the doctor beam 14 about a pivot axis 23.
  • the doctor blade 1 serving as a squeegee is clamped in a holding strip 13 of the squeegee bar 14 via pressure piece 8 and counter pressure piece 12.
  • a pressure bar 9 serves to generate the necessary contact pressure by means of an S-shaped deflection of the coating blade.
  • individual electromagnets 4, 5 (4 is the coil, 5 is the core made of iron) are now provided as a control device for the transverse profile, which are mounted in a carriage 3 by means of a holding sleeve 6.
  • the entire profile correction device is designated by 2. This also includes a bearing cam 16 in which actuating rods 18 engage the carriage 3 by means of bolts 17.
  • the carriage is arranged in a guide 7 of the retaining strip 13 so as to be displaceable against the doctor blade of the paper web.
  • the feed lines to the electromagnets are designated 19 and 20, which run in an envelope 21.
  • the electromagnets locally exert a line load q f on the area of the coating blade 1 close to the paper web or the counter roller 10. These counteract the contact pressure F and thus control the cross profile of the stroke application.
  • the basic contact pressure is generated by the displacement ⁇ s by means of the pressure bar 9.
  • the magnetic induction of the magnets is controlled via their coil current in accordance with the locally required contact pressure of the coating blade 1.
  • a permanent magnet 4 ' can be used as a magnet and a hose 24 can be used as a pressure piece, which can also perform the function as the pressure bar 9. This is already known from other publications.
  • the individual permanent magnets are precisely adjusted in their distance from the doctor blade 1 in order to control their contact pressure.
  • the doctor blade 1 is clamped on the doctor bar 31 by a clamping strip 32.
  • a pressure bar 29 for setting a contact pressure of the doctor blade 1 is guided in a guide 30.
  • the drive for this pressure bar is given here by a pressure hose 35.
  • other drive options also come, e.g. by means of hydraulic pistons or via linkage and lever, in question.
  • the profile correction is effected here by individual magnets 25, which are arranged in a row parallel to the contact edge of the coating blade 1 and counter-roller C on the doctor bar 31.
  • These magnets can be electromagnets, which consist of a yoke plate 34, a sleeve 33 and a wire coil 28 contained therein, arranged around an iron core, as shown in dashed lines.
  • the magnets can be adjusted by means of a lifting plate 27 via an adjusting rod 37.
  • the current strengths of the coils 28 can be adjustable in order to control the field strength of the coils.
  • the doctor blade 1 is attracted to different degrees in its area opposite the magnet, and thus the contact pressure of the doctor blade on the counter roller C or web of material varies significantly.
  • the doctor blade has a shape that consists of two arches parts composed, the part of the arch near the clamping is curved to the left in the drawing and the other part to the right is curved.
  • the magnets 25 are arranged at the beginning of the curved part to the right. Depending on the design options, the magnets can also be moved closer to the pressure bar 29.
  • permanent magnets can also be selected which can be adjusted by means of the lifting rods 37, depending on a signal which measures the stroke application or its profile. Likewise, the current is controlled in the same way in the case of electromagnets.
  • a support 36 which is arranged along the support device 35 of the paper web and is designed as a hollow roller, must be designed to be very rigid. It runs inside the hollow roller 35 parallel to its axis over its entire length. He carries at the end facing the hollow roll shell, the magnets 5 ', which are shown here in this case as electromagnets. These magnets exert tensile forces on the doctor blade 1 in accordance with their magnetic induction, as in the case of FIG. 1, and are therefore able to locally change the contact force of the coating blade 1 on the hollow roller 36 in accordance with their control, for example by their coil current. There the line profile can also be controlled with.
  • the yoke carrier 36 is advantageously made of high-strength aluminum. But it can also consist of steel and you can isolate the magnets against the yoke support by means of insulation plates 37.
  • the hollow roller 35 is preferably given a jacket made of non-magnetic material.
  • the outflow device 29 for the doctor blade is here by pressure elements, e.g. adjustable by pneumatic pressure medium from the inside expanded pressure elements, possibly also variable. This support can also be used in the case of FIG. 1.

Abstract

In the coating blade 1 which is bent in an S-shape by means of a pressure strip 9 for the purpose of applying its pressing force, for the purpose of profile correction an additional force of the profile correcting device 2 is exerted by means of magnets 4, 5. This additional force preferably acts counter to the main pressing force F. In this way, a change in the geometry of the coating blade in the contact area, i.e. in the area of its coating edge, is prevented from occurring by the profile correcting device. <IMAGE>

Description

Die Erfindung betrifft eine Streicheinrichtung zur Beschichtung laufender Bahnen, insbesondere aus Papier oder Karton, entspre­chend dem Oberbegriff des Patentanspruchs 1.The invention relates to a coating device for coating running webs, in particular made of paper or cardboard, according to the preamble of patent claim 1.

Solche Einrichtungen sind vielfach bekannt z.B. aus der DE-PS 35 30 063.Such devices are widely known e.g. from DE-PS 35 30 063.

Beim Aufbringen von Druckkräften wird bei Streicheinrichtungen vielfach von Druckschläuchen Gebrauch gemacht. Man kann damit einerseits eine als Streichklinge ausgebildete Rakel in der Halterung festklemmen und andererseits aber auch Drücke auf die Rakel ausüben, um die Dicke der auf das Papier aufgetragenen Beschichtung zu steuern. Gemäß der einleitend genannten Schrift werden zur Steuerung der Dicke des Strichauftrages u.a. leistenförmige Druckstücke 3 verwendet, die mittels Schrauben gegen die Streichklinge einstellbar sind und so deren Anpreß­kraft steuern. Man kann damit das sogenannte Querprofil des Strichauftrages, d.h. in Breiten- oder Querrichtung der Papier­bahn steuern, derart, daß sich ein möglichst gleichmäßiges Strichprofil, d.h. im Grunde genommen gar kein Profil, nämlich eine gleichmäßige Schichtdicke ergibt.When applying pressure forces, pressure hoses are often used in coating devices. It can be used to clamp a squeegee designed as a doctor blade in the holder and also to exert pressure on the squeegee to control the thickness of the coating applied to the paper. According to the document mentioned in the introduction, to control the thickness of the stroke order, strip-shaped pressure pieces 3 used, which are adjustable by means of screws against the coating blade and thus control the contact pressure. You can use it to create the so-called cross profile of the stroke order, i.e. Control in the width or cross direction of the paper web in such a way that a line profile that is as uniform as possible, i.e. basically no profile at all, namely a uniform layer thickness.

Hierbei tritt der Nachteil auf, daß durch die örtliche Steue­rung der Anpreßkraft der Streichklinge der Anliegewinkel α der schmalen Streichkante der Streichklinge an der Papierbahn etwas variiert. Dies ist nachteilig, um einen gleichmäßigen Strich­auftrag zu erzeugen, auch deswegen, weil es zu einem ungleich­mäßigen Abschleifen der Streichkante der Streichklinge kommt.The disadvantage here is that the local control of the contact pressure of the coating blade means that the contact angle α of the narrow coating edge of the coating blade on the paper web varies somewhat. This is disadvantageous in order to produce a uniform stroke application, also because the coating edge of the coating blade is ground unevenly.

Die Aufgabe der Erfindung ist es, demgegenüber eine Einrichtung anzugeben, mit der das Querprofil des Strichauftrages ohne die geschilderten nachteiligen Effekte gesteuert werden kann.The object of the invention, in contrast, is to provide a device with which the cross profile of the stroke order can be controlled without the disadvantageous effects described.

Diese Aufgabe wird erfindungsgemäß bei einer Einrichtung der eingangs genannten Art durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst.This object is achieved in a device of the type mentioned by the features of the characterizing part of claim 1.

Durch das Aufbringen der magnetischen Zugkräfte auf den der Wa­renbahn nahen Bereich der Streichklinge wird an der Geometrie der Streichbedingungen an der Streichklinge in bezug auf die Pa­pierbahn nichts verändert, so daß die geschilderten nachteiligen Effekte nicht auftreten können.By applying the magnetic tensile forces to the area of the coating blade near the web, the geometry of the coating conditions on the coating blade with respect to the paper web is not changed, so that the described adverse effects cannot occur.

Es ist allerdings durch die AT-PS 386 762 eine Streicheinrich­tung bekanntgeworden, bei der Magnetkräfte auf ein Rakelelement einwirken, das als eine Streichleiste ausgebildet ist. Dabei ist dieses Rakelelement Bestandteil einer größeren Anordnung, die auch die Zufuhrkammer für die Streichmasse aufweist und pendelnd aufgehängt ist, so daß sie im wesentlichen auf der Warenbahn bzw. der darauf aufgetragenen Streichmasse schwimmt. Dabei hat die Streichleiste eine Kontur, die im wesentlichen der die Wa­renbahn führenden Gegenwalze bzw. der durch die Führung der Wa­renbahn über die Gegenwalze unter teilweiser Umschlingung der­selben sich ergebenden Bahnführung entspricht. Hierbei kommt es nicht auf eine Unveränderbarkeit der Lage des Streichelements in bezug auf die Warenbahn an, sondern im Gegenteil wird hier der Streicheffekt gerade durch eine Verschiebung der Streichleiste unter Verschwenkung der gesamten, diese aufweisenden Streichan­ordnung bewirkt. Dabei ist allerdings offengelassen, in welcher Weise hier die genaue Zuordnung der einzelnen Teile bzw. die geometrische Ausbildung derselben vorgenommen werden soll, damit sich das beabsichtigte Streichergebnis auch einstellt. Ferner ist hierbei nur eine magnetisierbare, sehr starre Leiste vorge­ sehen, die offenbar von einer einheitlichen Magnetanordnung ins­gesamt angezogen werden soll. Eine Aufteilung in mehrere Einzel­magnete ist hierbei nicht vorgesehen, weil diese durch die star­re Ausbildung des Rakelelements bzw. der gesamten Rakeleinrich­tung ohne Effekt sein würde.However, a coating device has become known from AT-PS 386 762, in which magnetic forces act on a doctor element which is designed as a coating strip. This doctor element is part of a larger arrangement, which also has the feed chamber for the coating slip and is suspended in an oscillating manner, so that it essentially floats on the material web or the coating slip applied thereon. The scraper bar has a contour which essentially corresponds to the counter roll guiding the web or to the web guide resulting from the guidance of the web over the counter roll with partial wrapping around the same. It is not a question of an unchangeability of the position of the coating element in relation to the material web, but on the contrary, the coating effect is brought about here by a displacement of the coating strip while pivoting the entire coating arrangement comprising it. However, it is left open in which way the precise assignment of the individual parts or the geometrical design thereof is to be carried out so that the intended deletion result is also achieved. Furthermore, only a magnetizable, very rigid bar is featured here see, which is apparently to be attracted overall by a uniform magnet arrangement. A division into several individual magnets is not provided here because this would have no effect due to the rigid design of the doctor element or the entire doctor device.

Nachfolgend wird die Erfindung anhand der in den Figuren darge­stellten Ausführungsbeispiele erläutert, wobei

  • Fig. 1 prinzipmäßig einen Querschnitt durch die Streichein­richtung,
  • Fig. 1a eine Prinzipskizze der Kräfte dazu,
  • Fig. 2 eine weitere Variante der erfindungsgemäßen Streich­eineinrichtung und
  • Fig. 3 eine weitere Ausbildungsform der Erfindung darstellen.
The invention is explained below on the basis of the exemplary embodiments illustrated in the figures, wherein
  • 1 shows in principle a cross section through the coating device,
  • 1a is a schematic diagram of the forces to
  • Fig. 2 shows a further variant of the coating device according to the invention and
  • Fig. 3 represent another embodiment of the invention.

In Fig. 1 ist die Warenbahn mit C bezeichnet, an der die Streichklinge 1 mit einem durch Einstellung des Rakeltragbalkens 13, 14 angestellten Anpreßdruck anliegt. Man kann diesen Anpreß­druck dadurch erzeugen, daß man z.B. den Rakeltragbalken 14 um eine Schwenkachse 23 schwenkt. Die als Rakel dienende Streich­klinge 1 ist hierbei in eine Halteleiste 13 des Rakelbalkens 14 über Druckstück 8 und Gegendruckstück 12 eingeklemmt. Eine Druckleiste 9 dient dazu, den nötigen Anpreßdruck durch eine S-förmige Durchbiegung der Streichklinge zu erzeugen. Erfin­dungsgemäß sind nun als Steuereinrichtung für das Querprofil einzelne Elektromagneten 4, 5 (4 ist die Spule, 5 der Kern aus Eisen) vorgesehen, die mittels einer Haltehülse 6 in einem Schlitten 3 gelagert sind. Die gesamte Profilkorrektur­einrichtung ist mit 2 bezeichnet. Dazu gehört noch ein Lager­nocken 16, bei dem Betätigungsstangen 18 mittels Bolzen 17 am Schlitten 3 angreifen. Der Schlitten ist in einer Führung 7 der Halteleiste 13 gegen die Streichklinge der Papierbahn verschieb­lich angeordnet. Die Zuleitungen zu den Elektromagneten sind mit 19 und 20 bezeichnet, die in einer Umhüllung 21 laufen.In Fig. 1, the web is denoted by C, on which the doctor blade 1 rests with a contact pressure set by setting the doctor beam 13, 14. This contact pressure can be generated by, for example, pivoting the doctor beam 14 about a pivot axis 23. The doctor blade 1 serving as a squeegee is clamped in a holding strip 13 of the squeegee bar 14 via pressure piece 8 and counter pressure piece 12. A pressure bar 9 serves to generate the necessary contact pressure by means of an S-shaped deflection of the coating blade. According to the invention, individual electromagnets 4, 5 (4 is the coil, 5 is the core made of iron) are now provided as a control device for the transverse profile, which are mounted in a carriage 3 by means of a holding sleeve 6. The entire profile correction device is designated by 2. This also includes a bearing cam 16 in which actuating rods 18 engage the carriage 3 by means of bolts 17. The carriage is arranged in a guide 7 of the retaining strip 13 so as to be displaceable against the doctor blade of the paper web. The feed lines to the electromagnets are designated 19 and 20, which run in an envelope 21.

Gemäß Fig. 1a üben die Elektromagnete örtlich eine Streckenlast qf auf den der Papierbahn oder der Gegenwalze 10 nahen Bereich der Streichklinge 1 aus. Diese wirken der Anpreßkraft F entgegen und steuern somit das Querprofil des Strichauftrages. Die Grund­anpreßkraft wird durch die Verschiebung Δs mittels der Druck­leiste 9 erzeugt.According to FIG. 1a, the electromagnets locally exert a line load q f on the area of the coating blade 1 close to the paper web or the counter roller 10. These counteract the contact pressure F and thus control the cross profile of the stroke application. The basic contact pressure is generated by the displacement Δ s by means of the pressure bar 9.

Die magnetische Induktion der Magnete wird über deren Spulen­strom entsprechend der örtlich erforderlichen Anpreßkraft der Streichklinge 1 gesteuert.The magnetic induction of the magnets is controlled via their coil current in accordance with the locally required contact pressure of the coating blade 1.

Gemäß Fig. 2 kann als Magnet auch ein Permanentmagnet 4′ benützt werden und als Druckstück kommt ein Schlauch 24 in Frage, der ebenso die Funktion wie die Druckleiste 9 ausüben kann. Dies ist von anderen Veröffentlichungen her aber schon bekannt.2, a permanent magnet 4 'can be used as a magnet and a hose 24 can be used as a pressure piece, which can also perform the function as the pressure bar 9. This is already known from other publications.

Über eine Anstellung des Schlittens 3 wird eine genaue Einstel­lung der einzelnen Permanentmagnete in ihrer Entfernung von der Streichklinge 1 vorgenommen, um deren Anpreßkraft zu steuern. Man kann dazu z.B. Schrittmotoren verwenden, die über ein Ge­triebe an der jeweiligen Betätigungsstange 18 angreifen. Dies kann man natürlich auch im Falle der Elektromagnete 4, 5 durch­führen und dabei deren Induktion unverändert lassen.By adjusting the carriage 3, the individual permanent magnets are precisely adjusted in their distance from the doctor blade 1 in order to control their contact pressure. You can e.g. Use stepper motors which engage the respective actuating rod 18 via a gear. This can of course also be done in the case of the electromagnets 4, 5, while leaving their induction unchanged.

Da die Magnete die Anpreßkraft örtlich zwar verringern, aber nicht auf die Geometrie der verformten Streichklinge einwirken, da sie ja eine kleinere Kraft ausüben als die Hauptanpreßkraft F beträgt, treten keine Veränderungen in der Geometrie an der Streichklinge auf, so daß eine genaue Strichkorrektur ohne schädliche Einflüsse möglich ist.Since the magnets reduce the contact pressure locally, but do not affect the geometry of the deformed coating blade, since they exert a smaller force than the main contact pressure F, there are no changes in the geometry of the coating blade, so that an exact stroke correction without harmful effects Influences is possible.

Bei den oben beschriebenen Anordnungen wird eine Profilkorrektur erreicht, ohne daß sich durch die Einwirkung der Magnete die Form und damit auch die Lage der Streichklinge irgendwie ändert.In the arrangements described above, a profile correction is achieved without the shape and thus the position of the coating blade being changed in any way by the action of the magnets.

Gemäß der Ausführungsform nach Fig. 3 ist erkannt worden, daß auch bei einer etwas anderen Anordnung im der Gegenwalze nahen Bogenteil der Streichklinge auch eine nur so geringe Formände­rung der Streichklinge auftritt, daß sie vernachlässigbar klein ist und nicht zu einem unregelmäßigen Strichauftrag führt. Man kann nämlich eine Grundeinstellung durch die Abstützung 29 vor­nehmen, so daß die Verstellung der Streichklinge bzw. Verände­rung ihrer Geometrie, insbesondere in bezug auf ihre Anliegekan­te bei der Profilkorrektur, äußerst gering ist. Nachfolgend wird die Fig. 3 im einzelnen erläutert.According to the embodiment according to FIG. 3, it has been recognized that even with a somewhat different arrangement in the bow part of the coating blade near the counter roller, there is only a slight change in shape of the coating blade that it is negligibly small and does not lead to an irregular stroke application. You can namely make a basic setting by the support 29 so that the adjustment of the doctor blade or change in its geometry, especially with respect to its contact edge during the profile correction, is extremely small. 3 is explained in detail below.

Die Streichklinge 1 ist an dem Rakelbalken 31 durch eine Klemm­leiste 32 eingespannt. Eine Druckleiste 29 zur Einstellung einer Anpreßkraft der Streichklinge 1 ist in einer Führung 30 beweg­lich geführt. Der Antrieb für diese Druckleiste ist hier durch einen Druckschlauch 35 gegeben. Natürlich kommen auch andere An­triebsmöglichkeiten, z.B. mittels hydraulischer Kolben oder über Gestänge und Hebel, in Frage.The doctor blade 1 is clamped on the doctor bar 31 by a clamping strip 32. A pressure bar 29 for setting a contact pressure of the doctor blade 1 is guided in a guide 30. The drive for this pressure bar is given here by a pressure hose 35. Of course, other drive options also come, e.g. by means of hydraulic pistons or via linkage and lever, in question.

Die Profilkorrektur wird hier durch einzelne Magnete 25 bewirkt, die in einer Reihe parallel zur Anliegekante der Streichklinge 1 und Gegenwalze C auf dem Rakelbalken 31 angeordnet sind. Diese Magnete können Elektromagnete sein, die aus einer Jochplatte 34, einer Hülse 33 und einer darin enthaltenen, um einen Eisenkern herum angeordneten Drahtspule 28, wie gestrichelt dargestellt ist, besteht. Die Magnete können mittels einer Hubplatte 27 über Stellstange 37 verstellt werden. Die Stromstärken der Spulen 28 können regelbar sein, um die Feldstärke der Spulen zu steuern. Dadurch wird die Streichklinge 1 verschieden stark in ihrem den Magneten gegenüberliegenden Bereich angezogen, und somit die An­preßkraft der Streichklinge an der Gegenwalze C bzw. Warenbahn deutlich variiert. Dadurch kommt es nur zu einer geringfügigen Anderung der Form und damit der Anliegekante der Streichklinge. Dabei hat die Streichklinge eine Form, die sich aus zwei Bogen­ teilen zusammensetzt, wobei der der Einspannung nahe Bogenteil in der Zeichnung nach links und der andere Bogenteil nach rechts gekrümmt ist. Die Magnete 25 sind dabei am Beginn des sich nach rechts krümmenden Bogenteils angeordnet. Je nach konstruktiven Möglichkeiten können auch die Magnete noch näher an die Druck­leiste 29 herangerückt werden.The profile correction is effected here by individual magnets 25, which are arranged in a row parallel to the contact edge of the coating blade 1 and counter-roller C on the doctor bar 31. These magnets can be electromagnets, which consist of a yoke plate 34, a sleeve 33 and a wire coil 28 contained therein, arranged around an iron core, as shown in dashed lines. The magnets can be adjusted by means of a lifting plate 27 via an adjusting rod 37. The current strengths of the coils 28 can be adjustable in order to control the field strength of the coils. As a result, the doctor blade 1 is attracted to different degrees in its area opposite the magnet, and thus the contact pressure of the doctor blade on the counter roller C or web of material varies significantly. As a result, there is only a slight change in the shape and thus the contact edge of the doctor blade. The doctor blade has a shape that consists of two arches parts composed, the part of the arch near the clamping is curved to the left in the drawing and the other part to the right is curved. The magnets 25 are arranged at the beginning of the curved part to the right. Depending on the design options, the magnets can also be moved closer to the pressure bar 29.

Man kann statt Elektromagneten auch Permanentmagnete wählen, die mittels der Hubstangen 37 verstellbar sind, abhängig von einem Signal, das den Strichauftrag bzw. dessen Profil mißt. Ebenso wird in gleicher Abhängigkeit der Strom im Fall von Elektro­magneten gesteuert.Instead of electromagnets, permanent magnets can also be selected which can be adjusted by means of the lifting rods 37, depending on a signal which measures the stroke application or its profile. Likewise, the current is controlled in the same way in the case of electromagnets.

Man kann auch ohne eine von einem Signal abhängigen Verstellbar­keit der Druckleiste 29 auskommen und die gesamte Anpreßkraft der Streichklinge durch die Magnete aufbringen. Da dann die un­terschiedlichen Kräfte ja auch nur durch unterschiedliche, auf die Streichklinge wirkende Magnetkräfte erzeugt werden, die in ihrer Höhe sich nicht so sehr unterscheiden, ist auch hier gege­ben, daß die Streichklinge in ihrer Form und der Lage ihrer Streichkante bei der Profileinstellung nur wenig verändert wird.It is also possible to do without an adjustability of the pressure bar 29 which is dependent on a signal and to apply the entire contact pressure of the coating blade by means of the magnets. Since the different forces are then only generated by different magnetic forces acting on the coating blade, which do not differ so much in terms of height, it is also the case here that the coating blade has only a little shape and position of its coating edge when the profile is adjusted is changed.

In Fig. 4 ist eine weitere Variante der magnetischen Anpressung dargestellt. Hierbei ist ein längs der als Hohlwalze ausgeführ­ten Unterstützungseinrichtung 35 der Papierbahn angeordneter Trager 36 vorgesehen, der sehr biegesteif ausgeführt werden muß. Er verläuft innerhalb der Hohlwalze 35 parallel zu deren Achse über deren gesamte Länge. Er trägt an dem dem Hohlwalzenmantel zugewandten Ende jeweils die Magnete 5′, die hier in diesem Fal­le als Elektromagnete dargestellt sind. Diese Magnete üben ent­sprechend ihrer magnetischen Induktion wie im Falle von Fig. 1 Zugkräfte auf die Rakel 1 aus, und vermögen somit entsprechend ihrer Ansteuerung, z.B. durch ihren Spulenstrom, die Anpreßkraft der Streichklinge 1 an der Hohlwalze 36 örtlich zu verändern. Da­ mit wird ebenfalls das Strichprofil steuerbar. Dies allerdings hier in umgekehrter Richtung wie im Falle von Fig. 1, indem näm­lich örtlich die Anpreßkraft durch die Anziehungskraft der Elek­tromagneten auf die Streichklinge 1 erhöht wird. Vorteilhafter­weise wird in diesem Falle der Jochträger 36 aus hochfestem Alu­minium ausgeführt. Er kann aber auch aus Stahl bestehen und man kann mittels Isolierungsplatten 37 die Magnete gegen den Joch­träger isolieren. Die Hohlwalze 35 erhält vorzugsweise einen Mantel aus unmagnetischem Material.4 shows a further variant of the magnetic contact pressure. In this case, a support 36, which is arranged along the support device 35 of the paper web and is designed as a hollow roller, must be designed to be very rigid. It runs inside the hollow roller 35 parallel to its axis over its entire length. He carries at the end facing the hollow roll shell, the magnets 5 ', which are shown here in this case as electromagnets. These magnets exert tensile forces on the doctor blade 1 in accordance with their magnetic induction, as in the case of FIG. 1, and are therefore able to locally change the contact force of the coating blade 1 on the hollow roller 36 in accordance with their control, for example by their coil current. There the line profile can also be controlled with. This, however, here in the opposite direction as in the case of FIG. 1, namely by locally increasing the contact pressure by the attractive force of the electromagnet on the doctor blade 1. In this case, the yoke carrier 36 is advantageously made of high-strength aluminum. But it can also consist of steel and you can isolate the magnets against the yoke support by means of insulation plates 37. The hollow roller 35 is preferably given a jacket made of non-magnetic material.

Die Abströmeinrichtung 29 für die Streichklinge ist hier durch Druckelemente, z.B. durch pneumatisches Druckmedium von innen aufgeweiteter Druckglieder, eventuell auch örtlich veränderlich, einstellbar. Diese Abstützung kann auch im Fall von Fig. 1 ange­wendet werden.The outflow device 29 for the doctor blade is here by pressure elements, e.g. adjustable by pneumatic pressure medium from the inside expanded pressure elements, possibly also variable. This support can also be used in the case of FIG. 1.

Claims (11)

1. Streicheinrichtung mit einer Rakel in Form einer Streich­klinge, die auf einem Rakelbalken eingespannt und abge­stützt ist, wodurch durch die Durchbiegung der Streichklin­ge die Anpreßkraft derselben aufgebracht wird zum Streichen von Papier oder Karton, dadurch gekennzeichnet, daß mehrere Magnete (4, 5) in einer zur Anliegekante der Streichklinge parallelen Reihe angeordnet sind, die an dem der Warenbahn bzw. Abstützeinrichtung derselben nahen Bogen der Streich­klinge (1) angreifende, magnetische Zugkräfte zur Profil­einstellung des aufgetragenen Strichs aufbringen.1. Coating device with a doctor blade in the form of a doctor blade, which is clamped and supported on a doctor bar, whereby the contact pressure of the doctor blade is applied by the deflection of the doctor blade for coating paper or cardboard, characterized in that several magnets (4, 5) in are arranged in a row parallel to the abutting edge of the coating blade, which apply magnetic tensile forces acting on the sheet of the coating blade (1) close to the material web or supporting device for adjusting the profile of the applied coating. 2. Streicheinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei einer gegebenenfalls auch einstellbaren Abstützung (9, 29, 35) der Streichklinge (1) zwischen ihrer Einspan­nung (12) und ihrer Anliegekante an der Warenbahn bzw. einer diese führenden Abstützungeinrichtung (C) die Magnete (4, 5; 4′ξ) zwischen der Abstutzung (9) der Streichklinge (1) und der Abstützeinrichtung (C) auf dem Rakelbalken (13, 14) angeordnet sind.2. Coating device according to claim 1, characterized in that in an optionally also adjustable support (9, 29, 35) of the coating blade (1) between its clamping (12) and its abutting edge on the web or a supporting device leading this (C) the magnets (4, 5; 4'ξ) are arranged between the support (9) of the doctor blade (1) and the support device (C) on the doctor bar (13, 14). 3. Streicheinrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Druckleiste (29) in Richtung auf die die Warenbahn abstützende Abstützeinrichtung (C) beweglich angeordnet ist.3. Coating device according to claim 2, characterized in that the pressure bar (29) is arranged movably in the direction of the support device (C) supporting the web. 4. Streicheinrichtung nach einem der Ansprüche 1 bis 3, da­durch gekennzeichnet, daß die Magnete Elektromagnete (4, 5) sind.4. Coating device according to one of claims 1 to 3, characterized in that the magnets are electromagnets (4, 5). 5. Streicheinrichtung nach Anspruch 4, dadurch gekennzeichnet, daß zur Profileinstellung die Elektromagnete (4, 5) in ihrer magnetischen Induktion entsprechend der geforderten Profilkorrektur einstellbar sind.5. Coating device according to claim 4, characterized in that for adjusting the profile, the electromagnets (4, 5) are adjustable in their magnetic induction in accordance with the required profile correction. 6. Streicheinrichtung nach einem der Ansprüche 1 bis 3, da­durch gekennzeichnet, daß die Magnete Permanentmagnete (4′) sind.6. Coating device according to one of claims 1 to 3, characterized in that the magnets are permanent magnets (4 '). 7. Streicheinrichtung nach einem der Ansprüche 1 bis 6, da­durch gekennzeichnet, daß die Magnete (4, 5) quer zu ihrer Reihenanordnung in Richtung auf die Streichklinge auf dem Rakelbalken (13, 14) verstellbar angeordnet sind.7. Coating device according to one of claims 1 to 6, characterized in that the magnets (4, 5) are arranged transversely to their row arrangement in the direction of the doctor blade on the doctor bar (13, 14) adjustable. 8. Streicheinrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Magnete auf Schlitten (3), die in einer Führung (7) des Rakelbalkens (14) oder eines damit verbundenen Halte­teils (13) verschiebbar sind, angeordnet sind.8. Coating device according to claim 7, characterized in that the magnets on slides (3) which are displaceable in a guide (7) of the doctor bar (14) or an associated holding part (13) are arranged. 9. Streicheinrichtung nach einem der Ansprüche 1 bis 8, da­durch gekennzeichnet, daß die Abstützeinrichtung für die Streichklinge (1) eine starre Stützleiste (9) ist.9. coating device according to one of claims 1 to 8, characterized in that the support device for the coating blade (1) is a rigid support strip (9). 10. Streicheinrichtung nach einem der Ansprüche 1 bis 9, da­durch gekennzeichnet, daß die Abstützeinrichtung der Streichklinge (1) ein Druckschlauch (23) ist.10. Coating device according to one of claims 1 to 9, characterized in that the supporting device of the coating blade (1) is a pressure hose (23). 11. Streicheinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Warenbahn von einer als Hohlwalze (25) ausgebilde­ten Gegenwalze im Bereich der Streichklinge (1) geführt ist, und daß im Inneren der Hohlwalze (25) ein Jochträger (26) angeordnet ist, der an seiner dem Mantel der Hohlwalze (25) benachbarten Seite die Elektromagnete (4) dem Mantel der Hohlwalze (25) eng benachbart trägt.11. Coating device according to claim 1, characterized in that the web is guided by a counter-roller designed as a hollow roller (25) in the region of the coating blade (1), and that in the interior of the hollow roller (25) a yoke carrier (26) is arranged, which on its side adjacent to the jacket of the hollow roller (25), the electromagnet (4) carries the jacket of the hollow roller (25) closely adjacent.
EP90107008A 1989-06-22 1990-04-11 Coating apparatus Expired - Lifetime EP0403749B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90107008T ATE98529T1 (en) 1989-06-22 1990-04-11 STREAMING.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3920445 1989-06-22
DE3920445 1989-06-22
DE4008435A DE4008435A1 (en) 1989-06-22 1990-03-16 PAINTING DEVICE
DE4008435 1990-03-16

Publications (3)

Publication Number Publication Date
EP0403749A2 true EP0403749A2 (en) 1990-12-27
EP0403749A3 EP0403749A3 (en) 1991-11-27
EP0403749B1 EP0403749B1 (en) 1993-12-15

Family

ID=25882219

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EP90107008A Expired - Lifetime EP0403749B1 (en) 1989-06-22 1990-04-11 Coating apparatus

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US (1) US5085168A (en)
EP (1) EP0403749B1 (en)
JP (1) JPH0330867A (en)
BR (1) BR9002990A (en)
CA (1) CA2018804A1 (en)
DE (2) DE4008435A1 (en)
ES (1) ES2047743T3 (en)
FI (1) FI903063A0 (en)
NO (1) NO177796C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512971A1 (en) * 1991-05-09 1992-11-11 Valmet Paper Machinery Inc. Method and device for coating of a moving base
GB2259262A (en) * 1991-09-03 1993-03-10 Univ Hull Blade control system
GB2278315A (en) * 1993-05-27 1994-11-30 Roland Man Druckmasch Chambered doctor blade
EP0829575A1 (en) * 1996-09-12 1998-03-18 Voith Sulzer Papiermaschinen GmbH Process and device for direct or indirect application of liquid or pasty media on a running material web
DE19904112A1 (en) * 1999-02-02 2000-08-03 Voith Sulzer Papiertech Patent Web coating station has two setting units to position the doctor blade upstream and downstream of it acting at different points from the blade edge to use less energy with a relatively high response speed

Families Citing this family (13)

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FI91025C (en) * 1991-02-08 1995-08-22 Valmet Paper Machinery Inc Method for adjusting the cross-sectional profile of the amount of paper or other web material and a coating station for carrying out the method
DE4130118C2 (en) * 1991-09-11 1995-04-20 Jagenberg Ag Device for coating a web of material guided around a counter roller, in particular a paper or cardboard web
US5242498A (en) * 1992-08-04 1993-09-07 The Kohler Coating Machinery Corporation Adjustable blade coater
DE4302373A1 (en) * 1993-01-28 1994-08-04 Voith Gmbh J M Coating device for running webs of paper or cardboard
FI94269C (en) * 1993-04-16 1995-08-10 Valmet Paper Machinery Inc Method and arrangement for loading a scraper blade
DE4401737C1 (en) * 1994-01-21 1995-05-04 Voith Gmbh J M Coating device
JP3331735B2 (en) * 1994-04-15 2002-10-07 ソニー株式会社 Coating device
DE19627688A1 (en) * 1996-07-10 1998-01-15 Jagenberg Papiertech Gmbh System for metering a coating on a web product, especially paper or board
EP0848110B1 (en) * 1996-12-13 2003-03-05 Beloit Technologies, Inc. Coating applicator with blade shaping
DE19843733A1 (en) * 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Wiper blade assembly coating paper or card bands with optionally-viscous liquid, employs system of leaf spring tensioning which forms ductor chamber and is readily replaced and adjusted
JP4711495B2 (en) 2000-08-08 2011-06-29 スリーエム イノベイティブ プロパティズ カンパニー Coating device
ES2310976B1 (en) * 2007-07-11 2009-11-19 Jose Joaquin Amonarriz Azcolain SCRAPER DEVICE FOR THE PAPER INDUSTRY.
DE102022112542A1 (en) 2022-05-19 2023-11-23 Voith Patent Gmbh Device, use and method for dosing or leveling

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DE3001073B1 (en) * 1980-01-14 1981-06-04 Jagenberg-Werke AG, 4000 Düsseldorf Device for applying a coating to a material web

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AT386762B (en) * 1985-05-08 1988-10-10 Zimmer Johannes METHOD AND DEVICE FOR IMPREGNATING AND / OR COATING APPLICATION ON A TRACK OF GOODS
SE447545B (en) * 1985-06-12 1986-11-24 Inventing Ab SET AND DEVICE FOR LEAF COATING OF A CURRENT MATERIAL COAT
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FR2364122A1 (en) * 1976-09-14 1978-04-07 Zimmer Johannes Squeegee for screen printing machine - has holding rod attracted towards screen by magnet and mounting movable relative to screen
DE3001073B1 (en) * 1980-01-14 1981-06-04 Jagenberg-Werke AG, 4000 Düsseldorf Device for applying a coating to a material web

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512971A1 (en) * 1991-05-09 1992-11-11 Valmet Paper Machinery Inc. Method and device for coating of a moving base
GB2259262A (en) * 1991-09-03 1993-03-10 Univ Hull Blade control system
GB2259262B (en) * 1991-09-03 1995-04-12 Univ Hull Blade control system
GB2278315A (en) * 1993-05-27 1994-11-30 Roland Man Druckmasch Chambered doctor blade
GB2278315B (en) * 1993-05-27 1996-06-12 Roland Man Druckmasch Chambered doctor blade unit
EP0829575A1 (en) * 1996-09-12 1998-03-18 Voith Sulzer Papiermaschinen GmbH Process and device for direct or indirect application of liquid or pasty media on a running material web
DE19904112A1 (en) * 1999-02-02 2000-08-03 Voith Sulzer Papiertech Patent Web coating station has two setting units to position the doctor blade upstream and downstream of it acting at different points from the blade edge to use less energy with a relatively high response speed

Also Published As

Publication number Publication date
DE4008435A1 (en) 1991-01-03
ES2047743T3 (en) 1994-03-01
EP0403749B1 (en) 1993-12-15
NO177796C (en) 1995-11-22
US5085168A (en) 1992-02-04
FI903063A0 (en) 1990-06-18
EP0403749A3 (en) 1991-11-27
CA2018804A1 (en) 1990-12-22
NO902080L (en) 1990-12-27
BR9002990A (en) 1991-08-20
NO902080D0 (en) 1990-05-10
JPH0330867A (en) 1991-02-08
DE59003847D1 (en) 1994-01-27
NO177796B (en) 1995-08-14

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