EP2070600B1 - Method for coating a running web of paper, cardboard or another fibrous material using curtain coating - Google Patents
Method for coating a running web of paper, cardboard or another fibrous material using curtain coating Download PDFInfo
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- EP2070600B1 EP2070600B1 EP08170659A EP08170659A EP2070600B1 EP 2070600 B1 EP2070600 B1 EP 2070600B1 EP 08170659 A EP08170659 A EP 08170659A EP 08170659 A EP08170659 A EP 08170659A EP 2070600 B1 EP2070600 B1 EP 2070600B1
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- European Patent Office
- Prior art keywords
- application
- curtain
- guide plate
- medium
- heads
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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
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
- B05C5/008—Slide-hopper curtain coaters
Definitions
- the present invention relates to a method for coating a running paper, cardboard or other fibrous web by means of curtain coating, in which from at least two arranged above the fibrous web applicator heads directed down application medium in the form of medium curtains is delivered in order on one, a reach inclined plane forming guide plate on which the application media superimposed flow down and get from a downwardly directed curtain guide at the bottom of a two- or multi-layerschreibmediums- curtain on the surface of the fibrous web.
- Coated paper such as printing paper, pressure-sensitive paper, thermal paper, catalogs, etc.
- Coated paper is prepared by passing a pre-dried moving web through a coater and then finish drying.
- Coating machines are conventionally in the form of blade coaters which work with a doctor blade element, such as a blade or doctor blade or an air knife, and which use the method of replenishment. That is, it is here applied to the web application medium in abundance and brought to the required coating weight, which scraped by means of doctor blade, the excess application medium or blown away by means of the air knife.
- the disadvantages are such that, due to the fluid pressure when the application medium is applied to the web and also due to the pressure force of the doctor blade, a large amount of application medium penetrates into the web and the maintenance costs are high due to the wear of the doctor blade, rod or the like.
- the superfluous Scrapped medium dissipated, including additional effort is necessary.
- curtain coaters have frequently been used to coat the surface of a web of material, i. a paper carton or other fibrous web used.
- a curtain applicator coating is done "contactless" and only in the amount in which the application medium is to remain on the fibrous web. This means that no additional dosage takes place.
- the curtain coating is carried out in such a way that the relevant application medium is delivered to the moving web by an application head arranged above the web.
- the at least web-width application head has at least one application medium chamber and at least one likewise web-wide nozzle for dispensing the application medium in the form of a curtain layer.
- the delivered curtain layer then deposits on the surface of the web as a coating layer.
- curtain coaters that form multiple layers using two or more guns.
- FIG. 3 This prior art is shown in a partial sectional drawing of a curtain coater for two layers.
- the curtain coater for two layers of the invention has two curtain heads 1a and 1b, which deliver the flowing through the inside of the slots da and db application medium ta and tb directed downward.
- the curtain coater on a guide plate B with an inclined plane Ba receives from the said two curtain heads 1a and 1b respectively successively discharged application medium ta and tb, which flows down on this inclined plane in succession überchrolases and from the downwardly directed curtain guide part Bb at the lower edge portion of this inclined plane Ba as medium curtain ca, cb is dropped onto the surface of the material or fibrous web w.
- the two coating layers sa (lower layer) and sb (upper layer) are formed on the surface of the moving fibrous web w.
- the arrow shows the direction of movement of the web w.
- Fig. 4 shows explanatory figures of the disclosed in said known patent document method.
- 1a, 1b and 1c are applicator heads and ca
- cb and cc are the curtains emitted by the respective applicator heads.
- 2a, 2b and 2c are the catch basin and B is the guide plate.
- Bb represents a curtain guide and w is the material web.
- 3 is the application medium catch basin for the mixed application medium coming from the curtain guide Bb.
- FIG. 4a shows how the medium curtain ca from the applicator head 1a, the medium curtain cb from the applicator head 1b and the medium curtain cc from the applicator head 1c on the guide plate B are stacked in order and allowed to flow from the curtain guide Bb as a three-layered medium curtain on the surface of the fibrous web w and so is deleted. In this case, it does not happen that the color curtains ca, cb and cc are received and circulated by the paint collecting tanks 2a, 2b and 2c.
- FIG. 4b shows how the medium curtain CA from the application head 1a and the medium curtain cc from the application head 1c on the guide plate B of Row after layer and flowed by the curtain guide Bb as a two-layer medium curtain on the surface of the web w and is painted so.
- the applicator head 1b is placed in the standby position, the medium curtain cb is received by the catch basin 2b and runs around or in place of the application medium warm water runs around.
- the Figure 4c shows how the medium curtain cb from the applicator head 1b and the medium curtain cc from the applicator head 1c on the guide plate B are stacked in sequence and flowed by the curtain guide Bb as a two-layered medium curtain on the surface of the web w and painted so.
- the applicator head 1a is placed in the ready position, the medium curtain ca is received by the catch basin 2a and runs around or in place of the application medium warm water runs around.
- FIG. 4d shows how the medium curtain CA from the applicator head 1a and the medium curtain cb from the applicator head 1b on the guide plate B are stacked in order and flowed from the curtain guide Bb as a two-layered medium curtain on the surface of the web w and painted so.
- the applicator head 1c is set in the standby position, the medium curtain cc is received by the paint collecting basin 2c and circulates, or warm water flows in place of the application medium.
- the application heads 1a, 1b and 1c are in the standby position, the curtains ca, cb and cc discharged therefrom are received and run by the catch basins 2a, 2b and 2c around.
- the distance from the gun to the guide plate B is significant. In Fig. 5 this is shown. Also, due to the specific properties of the application media, if the distance s from the applicator head to the guide plate B is inappropriate, the flow amount is small and the thickness of the medium curtain c is thin, it happens that the medium curtain c is torn by the surface tension during its fall by its own weight in the width direction, and the flux takes a split shape.
- the invention has for its object to provide a method for operating a curtain coater for multi-layer order, in which the disadvantages of the prior art do not occur.
- the respective applicator heads used are regulated in their position in the direction of movement of the web, wherein Beginning of the coating operation stand by the respective application heads in front of the guide plate and submit application medium, and below the respective application heads each a coating medium catch basin is ready, which receives the respective application medium from the respective application head and collects. There is a common mixing catch basin under these individual catch basins.
- the respective application heads are moved horizontally until their lower edge approaches the inclined plane of the guide plate. Meanwhile, the lower gun header is also moved to approach the sump for the nearest upper gun. As the lower collection head passes over the lower gun header, the transfer medium dispensed from the lower gun is guided by the guide plate so that it does not flow into the catch tray for the next upper gun. Only when the curtains delivered by the respective guns are stable, the mixing catch basin is withdrawn forward and the normal sweeping operation is underway.
- the rear edge of the mixing catch basin is positioned further back, that is to say positioned further in the upstream direction, than a lower edge of the guide plate. This one comes out with relatively little space.
- the distance between the lower edge of the respective applicator heads and the inclined plane of the guide plate is 0.1-100 mm.
- FIG. 12 shows the state in which both existing guns, ie, the upper-flow-side gun (in the upstream position) and the lower-gun gun (in the downstream position) are in standby and discharge the application medium, respectively.
- Fig. 2 (b) shows the operating state in which the order in the upstream and downstream direction with respect to the direction of the fibrous web arranged applicator heads are positioned over a guide plate.
- Figs. 1 (b) and 1 (c) such as Fig. 2 (a) each show the state during the movement of the guns, according to the previous figure, from a standby position to an operating position.
- the medium curtain discharged from the application head of the upper flow side 1a and cb is the medium curtain discharged from the application head of the lower flow side 1b.
- a catch basin 2a for the applicator head 1a and another catch basin 2b for the applicator head 1b are also recognizable.
- a guide plate is designated, which is arranged at the catch basin 2b for the applicator head 1b in the downstream position (seen in the direction of movement L of Faserstoffbah w).
- This guide plate 2c forms an inclined plane for the flowing down therefrom Application medium from the applicator head 1b in the interior of the catch basin 2b.
- the guide plate B which receives the medium curtains (curtains of, for example, coating color) ca and cb discharged from the respective applicator heads 1a and 1b in turn on their inclined plane Ba, flows down along the inclined plane Ba, and from a downwardly directed curtain guide Bb the guide plate B or from its lower edge as a two-layer medium curtain ca, cb flow onto the surface of the fibrous web w.
- medium curtains curtains of, for example, coating color
- the applicator head 1a, the applicator head 1b, and the applicator cup 2b move horizontally toward the back of the guide plate B (in the upstream direction).
- the medium curtain cb is further received by the catch basin 2b and circulated by means of a pump, not shown in the figure.
- the medium curtain ca is received by the mixing catch basin 3. Since the mixed application medium usually can not be recycled and reused, it is eliminated. Further, holders for the applicator head 1a, for the applicator head 1b and for the catch basin 2b on both sides of the curtain coater are provided horizontally along the curtain coater and can be moved on rails which are also not drawn in the figure.
- the applicator head 1a and the applicator head 1b even further moved in the direction of the guide plate B to the rear horizontally.
- the medium curtain cb flows down on the guide plate 2c, flows along its inclined plane, and flows into the interior of the catch basin 2b.
- the medium curtain ca is received by the mixing catch basin 3.
- the applicator head 1a and the applicator head 1b further moved horizontally in the direction of the guide plate B to the rear.
- the application head 1a is now located above the front edge of the guide plate B, wherein the medium curtain ca first flows down onto the guide plate B and thereby flows along the slated plane and then falls from the curtain guide Bb down into the mixing catch basin 3.
- the medium curtain cb moves away from the space above the guide plate 2c and is caught by the mixing catch basin 3.
- the applicator head 1a and the applicator head 1b are moved further backward, ie moved horizontally in the upward direction with respect to the running direction of the fibrous web w, so that the lower edges of the upstream applicator head 1a and that of the downstream applicator head 1b become the inclined plane Ba approximate the guide plate B and thus reach the desired operating position.
- the mixing catch basin 3 is pulled back forward (that is, in the downstream direction).
- the two-layer medium curtain ca, cb is then allowed to flow onto the surface of the fibrous web w.
- the present invention is not limited to the embodiment described above, and various changes are possible.
- the direction of movement of the web w in the Fig. 1 or Fig. 2 be shown opposite direction.
- the explanation was made so that the sump 2a is fixed to the application head 1a, but it may be horizontally movable.
- a further application head can be provided, which is attached even further upstream than the already existing upstream head 1 a, so that then three application layers are formed.
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- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paper (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Beschichtung einer laufenden Papier-, Karton- oder anderen Faserstoffbahn mittels Vorhangbeschichtung, bei der aus wenigstens zwei oberhalb der Faserstoffbahn angeordneten Auftragsköpfen nach unten gerichtet Auftragsmedium in Form von Mediumsvorhängen abgegeben wird, die der Reihe nach auf eine, eine schiefe Ebene bildende Führungsplatte gelangen, auf der die Auftragsmedien übereinandergelegt herabfließen und von einer nach unten gerichteten Vorhangführung am unteren Rand aus als zwei- bzw. mehrschichtiger Auftragsmediums- Vorhang auf die Oberfläche der Faserstoffbahn gelangen.The present invention relates to a method for coating a running paper, cardboard or other fibrous web by means of curtain coating, in which from at least two arranged above the fibrous web applicator heads directed down application medium in the form of medium curtains is delivered in order on one, a reach inclined plane forming guide plate on which the application media superimposed flow down and get from a downwardly directed curtain guide at the bottom of a two- or multi-layer Auftragmediums- curtain on the surface of the fibrous web.
Beschichtetes Papier, wie Druckpapier, Haftklebepapier, Thermopapier, Kataloge usw. wird hergestellt, indem eine vorgetrocknete laufende Materialbahn durch eine Streichmaschine läuft und anschließend fertiggetrocknet wird.Coated paper, such as printing paper, pressure-sensitive paper, thermal paper, catalogs, etc., is prepared by passing a pre-dried moving web through a coater and then finish drying.
Herkömmlich sind Streichmaschinen in Form von Rakelstreichmaschinen, die mit einem Rakelelement, wie Klinge oder Rakelstab oder einem Luftmesser arbeiten und die die Methode des Nachdosierens anwenden. Das heißt, es wird hierbei auf die Bahn Auftragsmedium im Überfluss aufgetragen und auf das erforderliche Strichgewicht gebracht, wobei mittels Rakelelement das überschüssige Auftragsmedium abgeschabt oder mittels dem Luftmesser weggeblasen wird. Allerdings hat das Nachteile derart, dass durch den Flüssigkeitsdruck beim Auftragen des Auftragsmediums auf die Bahn und auch durch die Druckkraft der Rakel viel Auftragsmedium in die Bahn eindringt und dass durch den Verschleiß von Rakel, Stab o. ä. die Instandhaltungskosten hoch sind. Außerdem muss das überflüssige abgeschabte Medium abgeführt, wozu zusätzlicher Aufwand notwendig ist.Coating machines are conventionally in the form of blade coaters which work with a doctor blade element, such as a blade or doctor blade or an air knife, and which use the method of replenishment. That is, it is here applied to the web application medium in abundance and brought to the required coating weight, which scraped by means of doctor blade, the excess application medium or blown away by means of the air knife. However, the disadvantages are such that, due to the fluid pressure when the application medium is applied to the web and also due to the pressure force of the doctor blade, a large amount of application medium penetrates into the web and the maintenance costs are high due to the wear of the doctor blade, rod or the like. In addition, the superfluous Scrapped medium dissipated, including additional effort is necessary.
In den letzten Jahren wurden häufig Vorhang-Auftragswerke zur Beschichtung der Oberfläche einer Materialbahn, d.h. einer Papier- Karton- oder anderen Faserstoffbahn eingesetzt. Mit Hilfe eines Vorhang-Auftragswerkes erfolgt das Beschichten "kontaktlos" und nur in der Menge, in der das Auftragsmedium auf der Faserstoffbahn verbleiben soll. Das heißt, es findet hierbei keine Nachdosierung mehr statt.In recent years, curtain coaters have frequently been used to coat the surface of a web of material, i. a paper carton or other fibrous web used. With the help of a curtain applicator coating is done "contactless" and only in the amount in which the application medium is to remain on the fibrous web. This means that no additional dosage takes place.
Das Vorhangbeschichten erfolgt derart, dass auf die sich bewegende Bahn das betreffende Auftragsmedium von einem oberhalb der Bahn angeordneten Auftragskopf abgegeben wird. Der mindestens bahnbreite Auftragskopf weist dazu mindestens eine Auftragsmediumskammer und mindestens eine ebenso bahnbreite Düse zur Abgabe des Auftragsmediums in Form einer Vorhangschicht auf. Die abgegebene Vorhangschicht legt sich dann auf die Oberfläche der Bahn als Auftragsschicht ab.The curtain coating is carried out in such a way that the relevant application medium is delivered to the moving web by an application head arranged above the web. For this purpose, the at least web-width application head has at least one application medium chamber and at least one likewise web-wide nozzle for dispensing the application medium in the form of a curtain layer. The delivered curtain layer then deposits on the surface of the web as a coating layer.
Vorhang-Auftragswerke arbeiten wie gesagt, anders als herkömmliche Streichmaschinen, weil nur soviel an Auftragsmedium abgegeben wird, wie auf der Bahn auch verbleiben soll und dadurch keine Nachdosierung erfolgt. Es sind deshalb auch keine Verschleißteile, wie Rakelelemente vorhanden. Dadurch erreicht man Vorteile derart, dass die Instandhaltung einfach ist, die Strichmenge einfach mit hoher Präzision reguliert werden kann, die Bedienbarkeit gut ist und der Effekt der Oberflächenverbesserung durch Konturstrich (Contour Coat) hoch ist.Curtain commissioned work as I said, unlike conventional coating machines, because only as much of the application medium is delivered, as will remain on the train and thus no additional dosing takes place. There are therefore no wearing parts, such as doctor elements available. This achieves advantages such that the maintenance is easy, the amount of coating can be easily regulated with high precision, the operability is good, and the effect of the surface enhancement by Contour Coat is high.
Indessen gibt es Vorhangstreichmaschinen, die unter Verwendung von zwei oder mehr Auftragsköpfen mehrere Schichten bilden.Meanwhile, there are curtain coaters that form multiple layers using two or more guns.
Aus der
In der
Wie
Ferner weist die Vorhangstreichmaschine eine Führungsplatte B mit einer schiefen Ebene Ba auf. Diese schiefe Ebene ba empfängt das von den besagten zwei Vorhangköpfen 1a und 1b jeweils der Reihe nach abgegebene Auftragsmedium ta und tb, welches sich auf dieser schiefen Ebene der Reihe nach übereinanderlegt herabfließt und vom nach unten gerichteten Vorhangsführungsteil Bb am unteren Randteil dieser schiefen Ebene Ba aus als Mediumsvorhang ca, cb auf die Oberfläche der Material- bzw. Faserstoffbahn w fallengelassen wird. Auf diese Art und Weise werden auf der Oberfläche der sich bewegenden Faserstoffbahn w die zwei Streichschichten sa (untere Schicht) und sb (obere Schicht) gebildet. Ferner zeigt der Pfeil die Bewegungsrichtung der Bahn w.Further, the curtain coater on a guide plate B with an inclined plane Ba. This inclined plane ba receives from the said two
Übrigens ist es im Falle des betreffenden Streichens mehrerer Schichten notwendig, dass die Auftragsköpfe vor dem Streichen schon das Auftragsmedium ausströmen. Das von den Auftragsköpfen abgegebene flüssige bis pastöse Medium wird von vorhandenen Farbauffangbecken empfangen, läuft um und wird danach wieder verwendet. Da relativ viel Zeit vergeht, bis man einen stabilen Vorhang mit bestimmter Temperatur und Viskosität erhält, ist in dieser Zeit das Produkt nicht stabil und es gibt Verluste.Incidentally, in the case of coating several layers at a time, it is necessary for the application heads to discharge the application medium before painting. The liquid to pasty medium dispensed from the applicator heads is received by existing paint collectors, recirculates and then reused. Since it takes a relatively long time to obtain a stable curtain with a certain temperature and viscosity, the product is not stable during this time and there are losses.
In dem Falle, dass ein Auftragskopf stillsteht und nur der andere Auftragskopf betrieben wird und danach der Betrieb unter Verwendung beider Auftragsköpfe durchgeführt werden soll, passiert es, dass das Auftragsmedium im Innenteil des nichtbenutzten Auftragskopfes eintrocknet und/oder das Schlitzteil verstopft. Durch eine Veränderung der Temperatur vor und nach Zuführung des Mediums wird die Form des Schlitzes instabil. Daher lässt muss man auch während des Betriebsstillstandes des Auftragskopfes oder nach Betriebsstillstand eine angemessene Zeit lang zum Beispiel warmes Wasser umlaufen lassen.In the event that one application head is stationary and only the other application head is operated and then the operation is to be carried out using both application heads, it happens that the application medium in the inner part of the unused application head dries and / or clogged the slot part. By changing the temperature before and after feeding the medium becomes the shape of the slot unstable. For this reason, warm water must be circulated for a reasonable amount of time even during the standstill of the application head or after a shutdown.
Ein Verfahren bzw. eine Betriebsmethode, die diese Probleme löst, ist in dem schon angesprochenen Patentdokument
Die
Die
Die
Die
Übrigens ist der Abstand vom Auftragskopf bis zu der Führungsplatte B bedeutsam. In
Um dafür zu sorgen, dass ein solches Phänomen nicht auftritt, wäre es wünschenswert, den Abstand s vom Auftragskopf 1 bis zur Führungsplatte B bis zu dem Abstand s1 vor dem Zerreißen in Breitenrichtung zu kürzen, aber wenn dies realisiert wird, passiert es, dass im Falle einer großen Flussmenge die Mediumsschicht r auf der Führungsplatte B unregelmäßig wird. Insbesondere wenn der Abstand s vom unteren Auftragskopf 1b (siehe
Um bei der mit
Der Erfindung liegt die Aufgabe zugrunde ein Verfahren zum Betreiben einer Vorhangstreichmaschine für mehrschichtigen Auftrag anzugeben, bei dem die Nachteile des Standes der Technik nicht auftreten.The invention has for its object to provide a method for operating a curtain coater for multi-layer order, in which the disadvantages of the prior art do not occur.
Erfindungsgemäß wird die Aufgabe durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.According to the invention the object is achieved by the characterizing features of claim 1.
Demgemäß werden die jeweiligen verwendeten Auftragsköpfe in ihrer Position in Bewegungsrichtung der Materialbahn reguliert, wobei vor Beginn des Beschichtungsbetriebes die jeweiligen Auftragsköpfe vor der Führungsplatte in Bereitschaft stehen und Auftragsmedium abgeben, und unter den jeweiligen Auftragsköpfen jeweils ein Auftragsmediums-Auffangbecken bereitsteht, welches das betreffende Auftragsmedium vom jeweiligen Auftragskopf empfängt und sammelt. Dabei steht unter diesen einzelnen Auffangbecken ein gemeinsames Vermischungs- Auffangbecken bereit.Accordingly, the respective applicator heads used are regulated in their position in the direction of movement of the web, wherein Beginning of the coating operation stand by the respective application heads in front of the guide plate and submit application medium, and below the respective application heads each a coating medium catch basin is ready, which receives the respective application medium from the respective application head and collects. There is a common mixing catch basin under these individual catch basins.
Beim Beginnen des Beschichtungsbetriebes werden dann die jeweiligen Auftragsköpfe horizontal bewegt bis ihr unterer Rand sich der schiefen Ebene der Führungsplatte annähert. Währenddessen wird auch das Auffangbecken für den unteren Auftragskopf so bewegt, dass es sich dem Auffangbecken für den nächst gelegenen, oberen Auftragskopf annähert. Während der untere Auffangkopf über dem Auffangbecken für den unteren Auftragskopf durchläuft, wird mittels der Führungsplatte das vom unteren Auftragskopf abgegebene Auftragsmedium so geführt, dass es nicht in das Auffangbecken für den nächst gelegenen oberen Auftragskopf fließt. Erst wenn die von den jeweiligen Auftragsköpfen abgegebenen Vorhänge stabil sind, wird das Vermischungsauffangbecken nach vorn zurückgezogen und der normale Streichbetrieb läuft.When starting the coating operation then the respective application heads are moved horizontally until their lower edge approaches the inclined plane of the guide plate. Meanwhile, the lower gun header is also moved to approach the sump for the nearest upper gun. As the lower collection head passes over the lower gun header, the transfer medium dispensed from the lower gun is guided by the guide plate so that it does not flow into the catch tray for the next upper gun. Only when the curtains delivered by the respective guns are stable, the mixing catch basin is withdrawn forward and the normal sweeping operation is underway.
Auf diese Art und Weise ist bei der Bewegung der Auftragsköpfe von der Bereitschaftsposition bis zur Betriebsposition eine nur horizontale Bewegung notwendig und auch während der Bewegung der Auftragsköpfe tritt ein Vermischen der Auftragsmedien nicht oder nur sehr wenig auf.In this way, in the movement of the guns from the standby position to the operating position only a horizontal movement is necessary and even during the movement of the guns occurs a mixing of the application media is not or only very little.
Vorteilhaft ist es, wenn für den Bereitschaftszustand der hintere Rand des Vermischungsauffangbeckens weiter hinten positioniert wird, also weiter in stromaufwärtige Richtung positioniert wird, als ein unterer Rand der Führungsplatte. Damit kommt man mit relativ geringem Platzbedarf aus.It is advantageous if, for the ready state, the rear edge of the mixing catch basin is positioned further back, that is to say positioned further in the upstream direction, than a lower edge of the guide plate. This one comes out with relatively little space.
Vorteilhaft ist auch hinsichtlich der Platzverhältnisse, wenn für die Betriebsphase, also für das Vorhangbeschichten die einzelnen Auffangbecken eine Position oberhalb des Vermischungsauffangbeckens gebracht werden.It is also advantageous in terms of space when, for the operating phase, ie for the curtain coating the individual catch basins are placed a position above the mixing catch basin.
Das erfolgt ebenfalls sehr einfach nur in horizontaler Richtung.This is also done very simply only in the horizontal direction.
Es ist außerdem zweckmäßig, wenn bei Betrieb der Abstand zwischen dem unteren Rand der jeweiligen Auftragsköpfe und der schiefen Ebene der Führungsplatte 0,1 - 100 mm beträgt.It is also useful if, during operation, the distance between the lower edge of the respective applicator heads and the inclined plane of the guide plate is 0.1-100 mm.
Insgesamt erreicht man mit dem erfindungsgemäßen Verfahren, dass:
- keine Verstopfungen der Mediums-führenden Bauteile eintreten,
- die einzelnen Mediumsvorhänge nicht zerreißen und dadurch auch der mehrschichtige Vorhang sich einwandfrei ausbildet,
- die Qualität der auf die Führungsplatte sich übereinanderlegenden Schichten hoch ist, z. B. keine Kratzer entstehen,
- die Auftragsqualität der Mehrfachschicht auf der Faserstoffbahnoberfläche sehr gut ist,
- keine aufwändigen Schwenkbewegungen durchgeführt werden müssen, sondern nur Bewegungen der Auftragsköpfe und der Auffangbecken in horizontaler Richtung notwendig ist,
- und während der Bewegungen die Auftragsmedien sich nicht vermischen.
- no clogging of the medium-carrying components occur
- The individual medium curtains do not tear and thus the multilayer curtain is formed properly,
- the quality of the overlying layers on the guide plate is high, e.g. B. no scratches occur,
- the application quality of the multi-layer on the fibrous web surface is very good,
- no elaborate pivoting movements must be carried out, but only movements of the application heads and the catch basin in the horizontal direction is necessary,
- and during the movements the order media do not mix.
Im Folgenden wird eine Ausführungsform der vorliegenden Erfindung unter Bezugnahme auf die Zeichnungen erklärt.Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.
Es zeigen:
- Fig.1:
- eine schematisch dargestellte Seitenansicht einer Vorhangstreichmaschine zur Erklärung der Betriebsmethode der Vorhangstreichmaschine gemäß der vorliegenden Erfindung.
- Fig. 2:
- eine schematisch dargestellte Seitenansicht zur weiteren Erklärung der Betriebsmethode der Vorhangstreichmaschine gemäß der vorliegenden Erfindung.
- Fig. 3:
- eine Schnittzeichnung eines Teils einer Vorhangstreichmaschine für zwei Schichten gemäß dem Stand der Technik (prior art)
- Fig. 4:
- eine erklärende Zeichnung der in
Figur 3 dargestellten herkömmlichen Betriebsmethode einer Vorhangstreich- maschine (prior art) - Fig. 5
- ist eine Zeichnung, die erklärt, dass der Abstand vom Auftragskopf bis zur Führungsplatte wichtig ist.(prior art)
- Fig.1:
- a schematically illustrated side view of a curtain coater for explaining the operating method of the curtain coater according to the present invention.
- Fig. 2:
- a schematically illustrated side view for further explanation of the method of operation of the curtain coater according to the present invention.
- 3:
- a sectional view of part of a curtain coater for two layers according to the prior art (prior art)
- 4:
- an explanatory drawing of the in
FIG. 3 illustrated conventional operating method of a curtain coater (prior art) - Fig. 5
- is a drawing that explains that the distance from the gun to the guide plate is important. (prior art)
Die
In diesen Zeichnungen ist, wie in
Wie in
Danach werden, wie in
Danach werden, wie in der
Danach werden, wie in
Danach werden, wie in
Bei einer Unterbrechung die geschilderten Vorgänge in der der oben beschriebenen Reihenfolge werden sie in entgegengesetzter Reihenfolge ausgeführt. Zum Schluss wird warmes Wasser in Umlauf gebracht und die Reinigung der Mediums-führenden Einrichtungen, also Auftragsköpfe und das Innere der zugehörigen Leitungen, durchgeführt.When interrupted, the described operations in the order described above, they are executed in opposite order. Finally, hot water is circulated and the cleaning of the medium-carrying facilities, ie guns and the interior of the associated lines, performed.
Auf diese Art und Weise ist bei der Bewegung der Auftragsköpfe 1 a und 1 b von der Bereitschaftsposition bis zur Betriebsposition eine nur horizontale Bewegung notwendig und auch während der Bewegung der Auftragsköpfe tritt ein Vermischen der Auftragsmedien nur wenig auf.In this way, in the movement of the applicator heads 1 a and 1 b from the standby position to the operating position only a horizontal movement is necessary and even during the movement of the guns occurs mixing of the application media only slightly.
Die vorliegende Erfindung ist nicht auf die oben beschriebene Ausführungsform beschränkt und es sind vielerlei Änderungen möglich. Z. B. kann die Bewegungsrichtung der Bahn w auch der in
- 1a1a
- stromaufwärtig angeordneter Auftragskopfupstream applicator head
- 1b1b
- stromabwärtig angeordneter Auftragskopfdownstream applicator head
- 2a2a
- Auffangbecken für den stromaufwärtig angeordneten AuftragskopfSump for the upstream arranged gun
- 2b2 B
- Farbauffangbecken für den stromabwärtig angeordneten AuftragskopfPaint catcher for the downstream gun
- 2c2c
- Führungsplatteguide plate
- 33
- Vermischungsauffangbeckenmixing catch basin
- BB
- Führungsplatteguide plate
- BaBa
- schiefe Ebene der Führungsplatteinclined plane of the guide plate
- Bbbb
- Vorhangführungcurtain guide
- LL
- Bewegungsrichtung der FaserstoffbahnDirection of movement of the fibrous web
Claims (4)
- Method for operating a curtain coating machine for multilayer application to a running paper, board or other fibrous web, where, during the curtain coating, application medium curtains directed downwards are discharged from at least two application heads (1a, 1b) arranged above the fibrous web (w) and, one after another, reach a guide plate forming an inclined plane (Ba), on which the application media, lying one above another, flow down and reach the surface of the fibrous web (w) as a multilayer application medium curtain directed downwards from a curtain guide (Bb) of the guide plate (B),
characterized in that
the positions of the respective application heads (1a, 1b) can be changed in such a way that, before the start of the coating operation, the respective application heads are standing by in front of the guide plate (B) and in each case discharge application medium, which is in each case picked up and collected by individual collecting trays (2a; 2b) assigned to the application heads (1a, 1b), and a common mixture collecting tray (3) is also standing by, in the standby state and for the start of the operation of the coating operation, the respective application heads (1a, 1b) being moved horizontally until their lower edge approaches the guide plate (B), while the collecting tray (2b) is also initially moved in such a way that it approaches the collecting tray (2a) for the nearest upstream application head (1a) and, while the downstream application head (1b) is above the collecting tray (2b), the application medium discharged from the downstream application head (1b) is guided by means of a guide plate (2c) such that it does not flow into the collecting tray (2a) for the next upstream application head (1a), and in that when the curtains discharged by the respective application heads (1a, 1b) are stable, the application heads (1a, 1b) are moved further in the upstream, horizontal direction until they have assumed their operating or coating position and, at the same time, the mixture collecting tray (3) is drawn back towards the front, i.e. in the downstream direction, so that the curtain discharged in many layers then reaches the fibrous web (w) from the guide plate (B). - Method according to Claim 1, characterized in that the mixture collecting tray (3) for the standby position is displaced in such a way that its rear edge is positioned further in the upstream direction than a lower edge (Bb) of the guide plate (B).
- Method according to Claim 1 or 2, characterized in that during coating operation, the distance between the lower edge of the respective application heads (1a, 1b) and the inclined plane (Ba) of the guide plate (B) is about 0.1 - 100 mm.
- Method according to Claims 1 to 3, characterized in that during the curtain coating (operating phase), the individual collecting trays (2a, 2b) assume a position above the mixture collecting tray (3).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007314894A JP5076215B2 (en) | 2007-12-05 | 2007-12-05 | Curtain coater operation method |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2070600A2 EP2070600A2 (en) | 2009-06-17 |
EP2070600A3 EP2070600A3 (en) | 2010-03-24 |
EP2070600B1 true EP2070600B1 (en) | 2011-05-25 |
Family
ID=40380303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08170659A Not-in-force EP2070600B1 (en) | 2007-12-05 | 2008-12-04 | Method for coating a running web of paper, cardboard or another fibrous material using curtain coating |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2070600B1 (en) |
JP (1) | JP5076215B2 (en) |
AT (1) | ATE510630T1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007029646A1 (en) * | 2007-06-26 | 2009-01-08 | Voith Patent Gmbh | Application process as well as curtain applicator |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3903570B2 (en) * | 1998-01-20 | 2007-04-11 | 石川島播磨重工業株式会社 | Coating method and apparatus |
DE10359117A1 (en) * | 2003-12-17 | 2005-07-28 | Voith Paper Patent Gmbh | Curtain applicator unit |
DE10359122A1 (en) * | 2003-12-17 | 2005-07-14 | Voith Paper Patent Gmbh | applicator |
JP4746894B2 (en) * | 2005-03-14 | 2011-08-10 | ボイス ペ−パ− パテント ゲ−エムベ−ハ− | Coating equipment |
-
2007
- 2007-12-05 JP JP2007314894A patent/JP5076215B2/en not_active Expired - Fee Related
-
2008
- 2008-12-04 EP EP08170659A patent/EP2070600B1/en not_active Not-in-force
- 2008-12-04 AT AT08170659T patent/ATE510630T1/en active
Also Published As
Publication number | Publication date |
---|---|
JP5076215B2 (en) | 2012-11-21 |
EP2070600A2 (en) | 2009-06-17 |
ATE510630T1 (en) | 2011-06-15 |
JP2009136753A (en) | 2009-06-25 |
EP2070600A3 (en) | 2010-03-24 |
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