EP1596004B1 - Curtain coater - Google Patents
Curtain coater Download PDFInfo
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- EP1596004B1 EP1596004B1 EP20050102931 EP05102931A EP1596004B1 EP 1596004 B1 EP1596004 B1 EP 1596004B1 EP 20050102931 EP20050102931 EP 20050102931 EP 05102931 A EP05102931 A EP 05102931A EP 1596004 B1 EP1596004 B1 EP 1596004B1
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- European Patent Office
- Prior art keywords
- curtain
- application medium
- collecting device
- applicator
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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
- D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
- D21H23/48—Curtain coaters
Definitions
- the invention relates to a device for applying one or both sides of at least one liquid or pasty application medium to a running surface, comprising a curtain applicator for applying the at least one application medium and having at least one catching device for collecting the at least one application medium in the start and stop Phase of the coating process of the curtain applicator, wherein the curtain applicator delivers the at least one application medium as a substantially gravity-moving curtain during the coating process to the moving surface, and the surface when directly applied the surface of a paper, cardboard or other fibrous web and indirect application the surface of a transfer element, preferably an applicator roll, which delivers the at least one application medium to the surface of the fibrous web.
- a curtain applicator for applying the at least one application medium and having at least one catching device for collecting the at least one application medium in the start and stop Phase of the coating process of the curtain applicator, wherein the curtain applicator delivers the at least one application medium as a substantially gravity-moving curtain during the coating process to the moving surface, and the surface when directly applied the
- the fibrous web to be coated is provided with the application medium over a maximum length, it seems obvious to move the catching device as quickly as possible under the curtain when starting the coating process.
- the catcher is moved too fast under the thin curtain, the thin curtain is entrained by the air surrounding the catcher in the direction of movement of the catcher, so that application medium reaches the outer edge of the catcher and drips onto the fibrous web. Due to the dripping coating material it comes to order errors. As far as the coating material does not drip down and on the outer edge of the Drip tray dries, the dried-on paint can peel off and fall on the fibrous web, so it also comes to order errors.
- the curtain oscillates back and forth a few times, which also leads to order errors, in the form of areas of different line thicknesses.
- areas with too low line width and areas with a very high line width can arise.
- the areas with the very high line thickness can lead to a rupture of the fibrous web and cause drying problems. Since the dryer has to provide a higher drying capacity for drying these areas at times, this requires either a high level of skill of the machine operator or an elaborate control technology of the dryer.
- the thin curtain is moved too slowly away from the catcher, then the thin curtain is attracted by cohesive forces from the catcher.
- the curtain By attracting the curtain to the catcher also gets application medium to the outer edge of the catcher.
- the application medium then runs down the outer edge of the collecting device and drips onto the fibrous web.
- the curtain performs in this case again a pendulum motion, so that the above problems arise.
- the pendulum movement can also pollute a arranged near the curtain applicator suction for sucking the entrained by the fast moving fibrous web air layer.
- the invention has the object to improve the device of the type mentioned in that when starting the coating process order errors are reduced and the fibrous web is coated over its maximum length.
- the invention solves the problem by a device of the type mentioned, in accordance with the invention, the curtain applicator and the At least one collecting device at the beginning of the coating process at a speed of 20 mm / s to 150 mm / s are movable relative to each other.
- this speed range ensures that the fibrous web to be coated is provided with the application medium over its maximum length.
- the at least one collecting device further comprises a trough with an edge facing the curtain during the coating process, wherein the edge has a gradient of at least 10 ° relative to the horizontal.
- the edge has a gradient of at least 10 ° relative to the horizontal.
- At a gradient of at least 10 ° avoids that when hitting the coating medium on the edge air enters the application medium, which forms bubbles in the application medium and thus leads to order errors.
- the exact inclination of the slope depends on the application medium used and on its formulation.
- the curtain falls permanently on the at least 10 ° inclined edge, which is preferably only a few millimeters high.
- the slope of the edge passes into a tank bottom which has a gradient of less than 10 °, preferably a gradient of 1 ° to 5 °. This ensures that the catcher does not interfere with the collides under the catcher continuous fibrous web and the collected application medium is still dissipated satisfactorily.
- the speed range of the invention is meaningful only when starting the coating process, but can also be used when interrupting the coating process.
- the curtain applicator and the catcher can also be moved toward each other at a higher speed.
- the speed of the fibrous web can be at least 500 m / min.
- web speeds of 2500 m / min are also possible.
- the relative speed according to the invention between the curtain applicator and the catcher is large enough to provide the fibrous web to be coated with the application medium over the maximum length.
- the relative speed according to the invention between the curtain application unit and the collecting device can also be realized at a falling speed of at least 50 m / min. Even at the present time maximum falling speeds of 200 m / min, the relative speed of the invention between the curtain applicator and catcher can be realized.
- the relative speed of the curtain applicator and the at least one Capture device can be constant or variable.
- the relative speed at the beginning and end of the relative movement between the curtain applicator and the catcher may be lower and highest between the two endpoints of the travel path.
- the unwanted pendulum motion can be additionally reduced.
- the edge of the edge can be razor sharp. This ensures that no application medium runs down outside on the edge of the catcher when the catcher is driven into the curtain when interrupting the coating process or is moved out under the curtain when starting the coating process.
- Fig. 1 shows a device 10 for one or both sides applying a curtain forming application medium 11 on a fibrous web 12.
- the apparatus 10 has a curtain applicator 13 for applying the application medium 11 and a trough-shaped collecting device 14 for collecting the application medium 11.
- the curtain applicator 13 and the catcher 14 may, depending on If necessary, be moved along an arrow 15 for the running direction relative to each other. In this case, the curtain applicator 13 stand still and the catcher 14 are moved or the catcher 14 is stationary and the curtain applicator 13 moves. In a further alternative, it is also possible that the curtain applicator 13 and the catcher 14 move simultaneously.
- the curtain applicator 13 and the collecting device 14 move at a speed of 20 mm / s to 150 mm / s relative to each other.
- a relative speed between the curtain applicator 13 and the catcher 14 in this speed range an optimal order is achieved and at the same time the fibrous web 12 deleted over its maximum length.
- the trough-shaped collecting device 14 has an edge 16 which has a gradient with an inclination angle ⁇ of at least 10 °. Due to the gradient of at least 10 ° is avoided that upon impact of the application medium 11 on the edge 16 air enters the application medium 11, which may lead to order errors.
- the application medium 11 During the standby state of the catcher 14, where the fibrous web 12 is not coated, the application medium 11, as shown, permanently falls on the at least 10 ° inclined edge 16. Since the application medium 11 falls during the standby state on the outer edge 16, must of the Curtain applicator 13 and / or the catcher 14 are covered only a small distance to start the coating process from the standby state (start phase) or to interrupt the coating process (stop phase).
- the edge 16 is preferably only a few millimeters high.
- the slope of the edge 16 passes into a trough bottom 17, which usually has a gradient with an inclination angle ⁇ of 1 ° to 5 °, so that the collecting device 14 does not collide with the fibrous web 12 and the captured application medium is still dissipated satisfactorily.
- the edge 16 has a razor-sharp edge 20 (see Fig. 2 ).
- a razor-sharp edge 20 At the razor-sharp edge 20 is a surface 21 which drops at an angle ⁇ to the trough interior. By the surface 21 it is ensured that the application medium 11 is guided when hitting the edge 20 into the tub interior, and does not run down the outside edge 16 when the catcher 14 is driven when interrupting the coating process under the curtain formed by the falling application medium 11 or when starting the coating process is moved out under the curtain.
Description
Die Erfindung betrifft eine Vorrichtung zum ein- oder beidseitigen Auftragen von mindestens einem flüssigen oder pastösen Auftragsmedium auf eine laufende Oberfläche, aufweisend ein Vorhangauftragswerk zum Auftragen des mindestens einen Auftragsmediums und aufweisend mindestens eine Auffangeinrichtung zum Auffangen des mindestens einen Auftragsmediums in der Start- und Stopp-Phase des Beschichtungsvorganges des Vorhangauftragswerkes, wobei das Vorhangauftragswerk das mindestens eine Auftragsmedium als sich im wesentlichen schwerkraftbedingt bewegenden Vorhang während des Beschichtungsvorganges an die laufende Oberfläche abgibt, und die Oberfläche bei direktem Auftrag die Oberfläche einer Papier-, Karton- oder anderen Faserstoffbahn und bei indirektem Auftrag die Oberfläche eines Übertragungselementes, vorzugsweise eine Auftragswalze ist, welches das mindestens eine Auftragsmedium an die Oberfläche der Faserstoffbahn abgibt.The invention relates to a device for applying one or both sides of at least one liquid or pasty application medium to a running surface, comprising a curtain applicator for applying the at least one application medium and having at least one catching device for collecting the at least one application medium in the start and stop Phase of the coating process of the curtain applicator, wherein the curtain applicator delivers the at least one application medium as a substantially gravity-moving curtain during the coating process to the moving surface, and the surface when directly applied the surface of a paper, cardboard or other fibrous web and indirect application the surface of a transfer element, preferably an applicator roll, which delivers the at least one application medium to the surface of the fibrous web.
Damit die zu beschichtende Faserstoffbahn über eine maximale Länge mit dem Auftragsmedium versehen wird, scheint es naheliegend zu sein, die Auffangeinrichtung beim Starten des Beschichtungsvorganges möglichst schnell unter dem Vorhang wegzubewegen. Wenn jedoch beim Starten des Beschichtungsvorganges die Auffangeinrichtung zu schnell unter dem dünnen Vorhang wegbewegt wird, so wird der dünne Vorhang durch die die Auffangeinrichtung umgebende Luft in Bewegungsrichtung der Auffangeinrichtung mitgerissen, so dass Auftragsmedium an den äußeren Rand der Auffangeinrichtung gelangt und auf die Faserstoffbahn tropft. Durch das herunter tropfende Beschichtungsmaterial kommt es zu Auftragsfehlern. Soweit das Beschichtungsmaterial nicht herunter tropft und am äußeren Rand der Auffangeinrichtung antrocknet, kann die angetrocknete Farbe abplatzen und auf die Faserstoffbahn fallen, sodass es ebenso zu Auftragsfehlern kommt. Durch die Auslenkung des Vorhangs aus der Vertikalen pendelt der Vorhang einige Male hin und her, wodurch es ebenfalls zu Auftragsfehlern, und zwar in Form von Bereichen unterschiedlicher Strichstärken kommt. Somit können Bereiche mit einer zu geringen Strichstärke und Bereiche mit einer sehr hohen Strichstärke entstehen. Die Bereiche mit der sehr hohen Strichstärke können zu einem Abriss der Faserstoffbahn führen und Trocknungsprobleme bereiten. Da der Trockner zur Trocknung dieser Bereiche zeitweilig eine höhere Trockenleistung erbringen muss, erfordert dies entweder ein hohes Geschick des Maschinenführers oder eine aufwändige Regelungstechnik des Trockners. Wenn im umgekehrten Fall beim Starten des Beschichtungsvorganges der dünne Vorhang zu langsam von der Auffangeinrichtung wegbewegt wird, dann wird der dünne Vorhang durch Kohäsionskräfte von der Auffangeinrichtung angezogen. Durch die Anziehung des Vorhangs an die Auffangeinrichtung gelangt ebenfalls Auftragsmedium an den äußeren Rand der Auffangeinrichtung. Das Auftragsmedium läuft dann am äußeren Rand der Auffangeinrichtung herunter und tropft auf die Faserstoffbahn. Außerdem führt der Vorhang auch in diesem Fall wieder eine Pendelbewegung aus, sodass die obengenannten Probleme entstehen. Die Pendelbewegung kann außerdem eine in der Nähe des Vorhangauftragswerkes angeordnete Absaugeinrichtung zur Absaugung der durch die schnell laufende Faserstoffbahn mitgerissenen Luftschicht verschmutzen.So that the fibrous web to be coated is provided with the application medium over a maximum length, it seems obvious to move the catching device as quickly as possible under the curtain when starting the coating process. However, if at the start of the coating process, the catcher is moved too fast under the thin curtain, the thin curtain is entrained by the air surrounding the catcher in the direction of movement of the catcher, so that application medium reaches the outer edge of the catcher and drips onto the fibrous web. Due to the dripping coating material it comes to order errors. As far as the coating material does not drip down and on the outer edge of the Drip tray dries, the dried-on paint can peel off and fall on the fibrous web, so it also comes to order errors. Due to the deflection of the curtain from the vertical, the curtain oscillates back and forth a few times, which also leads to order errors, in the form of areas of different line thicknesses. Thus, areas with too low line width and areas with a very high line width can arise. The areas with the very high line thickness can lead to a rupture of the fibrous web and cause drying problems. Since the dryer has to provide a higher drying capacity for drying these areas at times, this requires either a high level of skill of the machine operator or an elaborate control technology of the dryer. Conversely, if, at the start of the coating process, the thin curtain is moved too slowly away from the catcher, then the thin curtain is attracted by cohesive forces from the catcher. By attracting the curtain to the catcher also gets application medium to the outer edge of the catcher. The application medium then runs down the outer edge of the collecting device and drips onto the fibrous web. In addition, the curtain performs in this case again a pendulum motion, so that the above problems arise. The pendulum movement can also pollute a arranged near the curtain applicator suction for sucking the entrained by the fast moving fibrous web air layer.
Aus der
Die Erfindung hat die Aufgabe die Vorrichtung der eingangs genannten Art dahingehend zu verbessern, dass beim Starten des Beschichtungsvorganges Auftragsfehler reduziert werden und die Faserstoffbahn über ihre maximale Länge bestrichen wird.The invention has the object to improve the device of the type mentioned in that when starting the coating process order errors are reduced and the fibrous web is coated over its maximum length.
Die Erfindung löst die gestellte Aufgabe durch eine Vorrichtung der eingangs genannten Art, bei der erfindungsgemäß das Vorhangauftragswerk und die mindestens eine Auffangeinrichtung zu Beginn des Beschichtungsvorganges mit einer Geschwindigkeit von 20 mm/s bis 150 mm/s relativ zueinander bewegbar sind.The invention solves the problem by a device of the type mentioned, in accordance with the invention, the curtain applicator and the At least one collecting device at the beginning of the coating process at a speed of 20 mm / s to 150 mm / s are movable relative to each other.
Bei einer Relativgeschwindigkeit zwischen dem Vorhangauftragswerk und der Auffangeinrichtung in diesem Geschwindigkeitsbereich werden Auftragsfehler deutlich reduziert. Insbesondere wird verhindert, dass Auftragsmedium an den äußeren Rand der Auffangeinrichtung gelangt und auf die Faserstoffbahn tropft. Außerdem sind auch die Pendelbewegungen des dünnen Vorhangs vernachlässigbar oder gar nicht mehr wahrnehmbar. Folglich entfallen auch die erhöhten Anforderungen an die Trocknung und die Gefahr eines unerwünschten Abrisses der Faserstoffbahn. Außerdem gewährleistet dieser Geschwindigkeitsbereich, dass die zu beschichtende Faserstoffbahn über ihre maximale Länge mit dem Auftragsmedium versehen wird.At a relative speed between the curtain applicator and the catcher in this speed range, job errors are significantly reduced. In particular, it is prevented that application medium reaches the outer edge of the collecting device and drips onto the fibrous web. In addition, the pendulum movements of the thin curtain are negligible or no longer noticeable. Consequently, the increased demands on the drying and the risk of undesired tears of the fibrous web are also eliminated. In addition, this speed range ensures that the fibrous web to be coated is provided with the application medium over its maximum length.
Bei der erfindungsgemäßen Vorrichtung weist die mindestens eine Auffangeinrichtung ferner eine Wanne mit einem während des Beschichtungsvorganges dem Vorhang zugewandten Rand auf, wobei der Rand gegenüber der Horizontalen ein Gefälle von mindestens 10° aufweist. Bei einem Gefälle von mindestens 10° wird vermieden, dass beim Auftreffen des Auftragsmediums auf den Rand Luft in das Auftragsmedium gelangt, die im Auftragsmedium Blasen bildet und folglich zu Auftragsfehlern führt. Die genaue Neigung des Gefälles hängt vom jeweils verwendeten Auftragsmedium und von seiner Rezeptur ab. Während des Bereitschaftszustandes, in dem also die Faserstoffbahn nicht beschichtet wird, fällt der Vorhang permanent auf den mindestens 10° geneigten Rand, der vorzugsweise nur wenige Millimeter hoch ist. Da der Vorhang während des Bereitschaftszustandes auf den äußeren Rand der Auffangeinrichtung fällt, ist nur eine geringe Relativbewegung zwischen dem Vorhangauftragswerk und der Auffangeinrichtung nötig, um den Beschichtungsvorgang vom Bereitschaftszustand aus zu starten und um den Beschichtungsvorgang zu unterbrechen.
Ferner geht bei der erfindungsgemäßen Vorrichtung das Gefälle des Randes in einen Wannenboden über, der ein Gefälle von weniger als 10° vorzugsweise ein Gefälle von 1° ° bis 5° aufweist. Damit wird erreicht, dass die Auffangeinrichtung nicht mit der unter der Auffangeinrichtung durchlaufenden Faserstoffbahn kollidiert und das aufgefangene Auftragsmedium trotzdem zufriedenstellend abgeführt wird.In the device according to the invention, the at least one collecting device further comprises a trough with an edge facing the curtain during the coating process, wherein the edge has a gradient of at least 10 ° relative to the horizontal. At a gradient of at least 10 ° avoids that when hitting the coating medium on the edge air enters the application medium, which forms bubbles in the application medium and thus leads to order errors. The exact inclination of the slope depends on the application medium used and on its formulation. During the standby state, in which therefore the fibrous web is not coated, the curtain falls permanently on the at least 10 ° inclined edge, which is preferably only a few millimeters high. Since the curtain falls on the outer edge of the catcher during the standby condition, only a small relative movement between the curtain applicator and the catcher is required to start the coating operation from the standby state and to interrupt the coating operation.
Furthermore, in the device according to the invention, the slope of the edge passes into a tank bottom which has a gradient of less than 10 °, preferably a gradient of 1 ° to 5 °. This ensures that the catcher does not interfere with the collides under the catcher continuous fibrous web and the collected application medium is still dissipated satisfactorily.
Besonders gute Resultate werden erzielt, wenn sich das Vorhangauftragswerk und die Auffangeinrichtung mit einer Relativgeschwindigkeit zwischen 100 mm/s und 150 mm/s zueinander bewegen.Particularly good results are achieved when moving the curtain applicator and the catcher with a relative speed between 100 mm / s and 150 mm / s to each other.
Der erfindungsgemäße Geschwindigkeitsbereich ist ausschließlich beim Starten des Beschichtungsvorganges bedeutungsvoll, kann aber auch beim Unterbrechen des Beschichtungsvorganges verwendet werden. Beim Unterbrechen des Beschichtungsvorganges können das Vorhangauftragswerk und die Auffangeinrichtung jedoch auch mit einer höheren Geschwindigkeit zueinander bewegt werden. Insbesondere bei einem Abriss der Faserstoffbahn ist es sinnvoll, das Vorhangauftragswerk und die Auffangeinrichtung mit maximaler Geschwindigkeit aufeinander zuzubewegen, um den Vorhang so schnell wie möglich vollständig aufzufangen.The speed range of the invention is meaningful only when starting the coating process, but can also be used when interrupting the coating process. However, when interrupting the coating process, the curtain applicator and the catcher can also be moved toward each other at a higher speed. In particular, in an outline of the fibrous web, it makes sense to the curtain applicator and the catcher to move towards each other at maximum speed to completely catch the curtain as quickly as possible.
Vorteilhafterweise kann die Geschwindigkeit der Faserstoffbahn mindestens 500 m/min betragen. Es sind jedoch auch Bahngeschwindigkeiten von 2500 m/min möglich. Bei diesen Bahngeschwindigkeiten ist die erfindungsgemäße Relativgeschwindigkeit zwischen dem Vorhangauftragswerk und der Auffangeinrichtung groß genug um die zu beschichtende Faserstoffbahn über die maximale Länge mit dem Auftragsmedium zu versehen.Advantageously, the speed of the fibrous web can be at least 500 m / min. However, web speeds of 2500 m / min are also possible. At these web speeds, the relative speed according to the invention between the curtain applicator and the catcher is large enough to provide the fibrous web to be coated with the application medium over the maximum length.
In einer Weiterbildung der Erfindung kann die erfindungsgemäße Relativgeschwindigkeit zwischen dem Vorhangauftragswerk und der Auffangeinrichtung auch bei einer Fallgeschwindigkeit von mindestens 50 m/min realisiert werden. Auch bei zur Zeit maximalen Fallgeschwindigkeiten von 200 m/min kann die erfindungsgemäße Relativgeschwindigkeit zwischen dem Vorhangauftragswerk und Auffangeinrichtung realisiert werden.In a development of the invention, the relative speed according to the invention between the curtain application unit and the collecting device can also be realized at a falling speed of at least 50 m / min. Even at the present time maximum falling speeds of 200 m / min, the relative speed of the invention between the curtain applicator and catcher can be realized.
Die Relativgeschwindigkeit vom Vorhangauftragswerk und der mindestens einen Auffangeinrichtung kann konstant oder veränderlich sein. Somit kann beispielsweise bei einer veränderlichen Relativgeschwindigkeit die Relativgeschwindigkeit zu Anfang und zum Ende der Relativbewegung zwischen dem Vorhangauftragswerk und der Auffangeinrichtung niedriger sein und zwischen den beiden Endpunkten des Verfahrweges am höchsten. Dadurch kann die unerwünschte Pendelbewegung zusätzlich reduziert werden.The relative speed of the curtain applicator and the at least one Capture device can be constant or variable. Thus, for example, at a variable relative speed, the relative speed at the beginning and end of the relative movement between the curtain applicator and the catcher may be lower and highest between the two endpoints of the travel path. As a result, the unwanted pendulum motion can be additionally reduced.
Die Kante des Randes kann messerscharf sein. Damit wird sichergestellt, dass kein Auftragsmedium außen am Rand der Auffangeinrichtung herunterläuft, wenn die Auffangeinrichtung beim Unterbrechen des Beschichtungsvorganges in den Vorhang hineingefahren wird oder beim Starten des Beschichtungsvorganges unter dem Vorhang herausgefahren wird.The edge of the edge can be razor sharp. This ensures that no application medium runs down outside on the edge of the catcher when the catcher is driven into the curtain when interrupting the coating process or is moved out under the curtain when starting the coating process.
Aus diesem Grund ist es zweckmäßig, wenn zwischen der messerscharfen Kante und der Innenseite des Randes eine zum Wanneninneren abfallende Fläche vorgesehen ist.For this reason, it is expedient if between the razor sharp edge and the inside of the edge, a sloping to the tub interior surface is provided.
Nachfolgend wird ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung anhand der beiliegenden Zeichnungen näher erläutert.Hereinafter, an embodiment of the device according to the invention will be explained in more detail with reference to the accompanying drawings.
Im Einzelnen zeigen:
- Fig. 1
- eine Schnittansicht durch eine erfindungsgemäße Vorrichtung;
- Fig. 2
- eine Detailansicht auf die messerscharfe Kante der Vorrichtung aus
Fig. 1 .
- Fig. 1
- a sectional view through a device according to the invention;
- Fig. 2
- a detailed view of the razor sharp edge of the device
Fig. 1 ,
Die wannenförmige Auffangeinrichtung 14 weist einen Rand 16 auf, der ein Gefälle mit einem Neigungswinkel β von mindestens 10° aufweist. Durch das Gefälle von mindestens 10° wird vermieden, dass beim Auftreffen des Auftragsmediums 11 auf den Rand 16 Luft in das Auftragsmediums 11 gelangt, wodurch es zu Auftragsfehlern kommen kann. Während des Bereitschaftszustandes der Auffangeinrichtung 14, wo die Faserstoffbahn 12 nicht beschichtet wird, fällt das Auftragsmedium 11, wie dargestellt, permanent auf den mindestens 10° geneigten Rand 16. Da das Auftragsmedium 11 während des Bereitschaftszustandes auf den äußeren Rand 16 fällt, muss von dem Vorhangauftragswerk 13 und/oder der Auffangeinrichtung 14 nur eine geringe Wegstrecke zurückgelegt werden, um den Beschichtungsvorgang vom Bereitschaftszustand (Start-Phase) aus zu starten oder um den Beschichtungsvorgang zu unterbrechen (Stopp-Phase).The trough-
Der Rand 16 ist vorzugsweise nur wenige Millimeter hoch. Das Gefälle des Randes 16 geht in einen Wannenboden 17 über, der üblicherweise ein Gefälle mit einem Neigungswinkel α von 1° bis 5 ° aufweist, damit die Auffangeinrichtung 14 nicht mit der Faserstoffbahn 12 kollidiert und das aufgefangene Auftragsmedium trotzdem zufriedenstellend abgeführt wird.The
Der Rand 16 weist eine messerscharfe Kante 20 auf (siehe
- 1010
- Vorrichtungcontraption
- 1111
- Auftragsmediumapplication medium
- 1212
- FaserstoffbahnFibrous web
- 1313
- VorhangauftragswerkCurtain applicator
- 1414
- Auffangeinrichtungcatcher
- 1515
- Laufrichtungdirection
- 1616
- Randedge
- 1717
- WannenbodenWannenboden
- 2020
- Kanteedge
- 2121
- Flächearea
- αα
- Neigungswinkeltilt angle
- ββ
- Neigungswinkeltilt angle
- δδ
- Winkelangle
Claims (7)
- Assembly (10) for applying at least one liquid or pasty application medium (11) to one or both sides of a moving surface, having a curtain applicator (13) for applying the at least one application medium (11) and having at least one collecting device (14) for collecting the at least one application medium (11) in the starting and stopping phase of the coating operation of the curtain applicator (13), the curtain applicator (13) discharging the at least one application medium (11) onto the moving surface as a curtain moving substantially under the force of gravity during the coating operation, and the surface in the case of direct application being the surface of a paper, board or other fibrous web (12), and in the case of indirect application being the surface of a transfer element, preferably an applicator roll, which discharges the at least one application medium (11) onto the surface of the fibrous web (12),
characterized in that
the curtain applicator (13) and the at least one collecting device (14) can be moved relative to each other at a speed of 20 mm/s to 150 mm/s in the starting and stopping phase of the coating operation, and the speed of the fibrous web (12) is at least 300 m/min, the at least one collecting device (14) having a trough with a border (16), the border (16) having a slope or an angle of inclination β of at least 10° with respect to an imaginary horizontal,
the slope of the border (16) merging into a trough bottom (17), which has a slope of less than 10°, preferably an angle of inclination α of 1° to 5°, and
during the coating operation, the border (16) facing the curtain (11). - Assembly (10) according to Claim 1,
characterized in that
the curtain applicator (13) and the at least one collecting device (14) can be moved relative to each other at a speed between 100 and 150 mm/s. - Assembly (10) according to Claim 1 or 2,
characterized in that
the curtain has a falling speed of at least 50 m/min. - Assembly (10) according to one of Claims 1 to 3,
characterized in that
the relative speed of the curtain applicator (13) and the at least one collecting device (14) is constant or variable. - Assembly (10) according to Claim 1,
characterized in that
one edge (20) of the border (16) is knife-sharp. - Assembly (10) according to Claim 5,
characterized in that
a surface (21) falling at an angle δ towards the interior of the trough is provided between the knife-sharp edge (20) and the inside of the border (16). - Assembly (10) according to one of Claims 1 to 6,
characterized in that
the collecting device (14) can be adjusted such that, when the same is located in the standby position and the curtain applicator (13) is located in the starting or stopping phase, the application medium (11) discharged as a curtain falls onto the border (16) of the collecting device (14).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004023575 | 2004-05-13 | ||
| DE200410023575 DE102004023575A1 (en) | 2004-05-13 | 2004-05-13 | Device for applying one or both sides of at least one liquid or pasty application medium to a running surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1596004A1 EP1596004A1 (en) | 2005-11-16 |
| EP1596004B1 true EP1596004B1 (en) | 2014-07-02 |
Family
ID=34939271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20050102931 Active EP1596004B1 (en) | 2004-05-13 | 2005-04-14 | Curtain coater |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1596004B1 (en) |
| JP (1) | JP2005324193A (en) |
| DE (1) | DE102004023575A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010041716A1 (en) * | 2010-09-30 | 2012-04-05 | Voith Patent Gmbh | Device for direct or indirect application of liquid to pasty application medium and method for operating such a device |
| DE102010042560A1 (en) * | 2010-10-18 | 2012-04-19 | Voith Patent Gmbh | Method for operating an application device for applying liquid to pasty application media in the form of at least one free-falling curtain and application device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4851268A (en) * | 1988-01-29 | 1989-07-25 | Eastman Kodak Company | Curtain coating start-up method and apparatus |
| US5017408A (en) * | 1990-08-08 | 1991-05-21 | Eastman Kodak Company | Curtain coating start/finish method and apparatus |
| JP3621204B2 (en) * | 1996-08-20 | 2005-02-16 | 三菱製紙株式会社 | Curtain coating apparatus and coating method |
| JP3563560B2 (en) * | 1997-05-28 | 2004-09-08 | 三菱製紙株式会社 | Curtain coating device and coating method |
| DE19954391A1 (en) * | 1999-11-12 | 2001-05-31 | Jagenberg Papiertech Gmbh | Device for determining coating parameters for a curtain coater |
| DE10117667A1 (en) * | 2001-04-09 | 2002-10-10 | Bachofen & Meier Ag Buelach | Device for extracting an air boundary layer from a running material web |
| EP1319747A2 (en) * | 2001-12-13 | 2003-06-18 | Dow Global Technologies Inc. | Method and apparatus for curtain coating |
-
2004
- 2004-05-13 DE DE200410023575 patent/DE102004023575A1/en not_active Withdrawn
-
2005
- 2005-04-14 EP EP20050102931 patent/EP1596004B1/en active Active
- 2005-05-12 JP JP2005139994A patent/JP2005324193A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005324193A (en) | 2005-11-24 |
| EP1596004A1 (en) | 2005-11-16 |
| DE102004023575A1 (en) | 2005-12-15 |
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