EP1432525B1 - Application device - Google Patents
Application device Download PDFInfo
- Publication number
- EP1432525B1 EP1432525B1 EP02771657A EP02771657A EP1432525B1 EP 1432525 B1 EP1432525 B1 EP 1432525B1 EP 02771657 A EP02771657 A EP 02771657A EP 02771657 A EP02771657 A EP 02771657A EP 1432525 B1 EP1432525 B1 EP 1432525B1
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- EP
- European Patent Office
- Prior art keywords
- substrate
- application
- blowing
- air
- weakening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- B05C5/005—Curtain coaters
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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
- D21H23/30—Pretreatment of the paper
Definitions
- the invention relates to a device for applying liquid or pasty application medium by means of a commissioned work on a running surface, wherein the substrate for direct application, the surface of a material web, in particular of paper or cardboard, and for indirect application, the surface of a transfer element, preferably a transfer roller, is, which then transfers the application medium to the surface of the material web, and wherein in the running direction of the substrate in front of the commissioned work a device for weakening the entrained by the underground air boundary layer is arranged.
- curtain coater i. an applicator device in which the applicator dispenses the application medium to the substrate as a curtain or veil that moves essentially by gravity.
- the application medium is delivered to the substrate in the form of a coating medium curtain, which moves substantially by gravity from the commissioned work to the ground.
- a curtain applicator also known in the art as "curtain coating”
- the curtain applicator is located at a predetermined distance from the ground, among other things, has the advantage that it is exposed to a lower risk of damage, for example, in a web break.
- Curtain coats differ from other "contactless" coater sets, such as free-jet jet coaters, where the movement the application medium to the substrate mainly results from the ejection pulse from the delivery nozzle of the commissioned work, fundamentally, since the shape of the discharge from the dispensing nozzle curtain is exposed only to the interplay between the surface tension of the coating medium and gravity.
- the surface tension tries to contract the curtain, which has a very large surface or circumferential length in relation to its volume or its cross-sectional area, so as to reduce its surface area. This effect is resisted only by gravity, which seeks to stretch the curtain. It is therefore easy to see that it is all the more difficult to obtain a uniformly over the entire working width Ansprgasmedium curtain, the larger this working width.
- the coating of webs by means of a curtain applicator, which feeds the web to the application medium as a substantially gravitationally moving application medium curtain has long been known from the coating of photographic films, tapes, and the like.
- the webs in these applications have a significantly smaller width than is the case with modern systems for the production of paper and paperboard webs, in which web widths of more than 10 m are required.
- Forming a uniformly thick application medium curtain over this width and being able to hold it in a stable manner is a task in which it is far from obvious to expect suggestions for a functional solution from the comparatively easy-to-control known narrow application medium curtains.
- the webs move in modern paper and paperboard production lines at speeds of up to 3000 m / min, which is many times the speed at which the known narrow webs move, and also a further high load on the Stability of the application medium curtain.
- the application devices for use in plants for the production and / or finishing of wide and fast-moving material webs, preferably made of paper or cardboard, to further improve, in particular as regards the weakening of the influence of the air boundary layer.
- Such wear can be prevented according to the invention by the combined use of a blowing device and one of these upstream in the running direction of the material web suction device.
- the blower has the one hand, the task vorzuschw kauen the entrained on the surface of the current underground air boundary layer. On the other hand, it supports the action of the blowing device, by sucking the air flow emitted by this and thereby stabilized in its movement along the ground.
- the weakening device according to the invention does not have any weakening elements set against the surface of the material web, ie, these contacting, but is free of such elements. In this sense, the weakening device according to the invention is a purely or exclusively non-contact weakening device.
- the blowing device used according to the invention may comprise a blow box to which air is supplied in the region of both side edges of the substrate.
- a substantially uniform over the working width of the ground air flow can be obtained, which moves in the opposite direction carried by the entrained air boundary layer.
- the outlet nozzle of the blowing device may comprise a slot nozzle or a plurality of individual nozzles.
- the suction device used according to the invention may comprise a suction box from which air is sucked off only in the region of one of the side edges of the substrate, preferably in the region of the drive-side side edge.
- the invention proposes that the applicator end facing the blowing device in the direction of the substrate from the impact position of the application medium on the ground a distance of between about 10th mm and about 50 mm.
- the blowing device has a guide wall which is arranged at a predetermined distance from the running substrate, a blowing channel can be formed through this guide wall in cooperation with the substrate, in which the air ejected from the blowing device flows in the opposite direction to the running direction of the substrate.
- the efficiency of the action of the ejected from the blowing air flow on the surface entrained air boundary layer can be improved.
- This effect is particularly effective when the baffle in the direction of the ground has a length of between about 300 mm and about 500 mm. This corresponds to when the blowing device is arranged in the region of a support roller, around which the material web is guided at least partially, depending on the roll diameter a wrap angle of about 90 °.
- the suction device in the running direction of the ground from the end facing the guide wall or the blowing device has a distance of between about 0 mm and about 50 mm.
- the blowing device and the suction device can thus both directly adjoin (distance: 0 mm) and have a predetermined distance from one another in the running direction of the ground, so that the suction device does not necessarily have to be able to extract all the air expelled from the blowing device.
- the attenuation device is preceded by a conditioning device which substantially completely removes the uppermost layers of the air boundary layer.
- a conditioning device which substantially completely removes the uppermost layers of the air boundary layer.
- the efficiency of the weakening device depends on various factors, for example the running speed of the ground.
- the conditioning device ensures that dependency on these influences is minimized, if not completely eliminated.
- the weakening device does not need to proceed against the entire air boundary layer, but only against the transmitted by the conditioning device part. As a result, the weakening device is relieved and can be designed correspondingly lower power.
- the conditioning device may comprise a strip extending in the transverse direction of the substrate, which may for example be formed by a simple metal strip.
- the conditioning device it is also possible for the conditioning device to exploit aerodynamic effects, for example by having a transverse cross-section which has the shape of an inverted airfoil profile.
- the conditioning device may be self-supporting or attached to the attenuation device.
- the weakening device according to the invention can be used in particular in an applicator device which has a curtain applicator, i. a commissioned work which emits the application medium as a curtain or veil moving essentially by gravity to the ground.
- air in the context of the present description, any gas or gas mixture can be understood, which is capable of affecting the entrained air boundary layer in a weakening sense.
- nitrogen gas could be used instead of air.
- air as a treatment gas is only preferred because compressed air in almost every machine hall anyway and thus without additional infrastructure and cost is available.
- a curved course takes.
- the material web may be guided around a support roller and / or around a support belt and / or around a support shoe.
- the air boundary layer is subject to centrifugal forces which seek to lift the air boundary layer away from the material web and thus facilitate the action of the weakening device, in particular the blowing device, on the air boundary layer.
- the radius of curvature of the curved course can be between about 300 mm and about 500 mm.
- the radius of curvature The smaller the radius of curvature, the greater the centrifugal force generated, but in practice the radius of curvature has a lower limit due to the deflection behavior of the material web. And upwards, the radius of curvature is limited on the one hand by the decrease in centrifugal force and, on the other, by space considerations.
- an applicator device is generally designated 10. It comprises a curtain applicator 12, from the discharge nozzle 14 application medium 16 is discharged as a coating medium curtain 18 to a moving in the direction L substrate U.
- the impact position of the application medium curtain 18 on the substrate U is in Fig. 1 denoted by P.
- the substrate U is formed by the surface 20a of a material web 20 onto which the application medium 16 is applied as a coating layer 22.
- a weakening device 24 is provided in the running direction L in front of the applicator 12.
- This weakening device 24 comprises on the one hand a blowing device 26 with a blow box 28 and on the other hand a suction device 30 with a suction box 32.
- the blow box 28 is located in relation to the running direction L of the substrate U immediately upstream of the applicator 12 and in particular of the application medium curtain 18.
- the tuyere 28a of the application medium curtain 18 has a distance a, which is preferably between about 10 mm and about 50 mm.
- the blowing nozzle 28a discharges an air flow 34 directed in the opposite direction to the running direction L, which moves in a blow channel 36 formed by a guide wall 28b of the blow box 28 and the substrate U.
- This baffle 28b has a length b of between about 300 mm and about 500 mm.
- This suction box 32 has on the one hand the task of weakening the air boundary layer G by sucking it from the ground U. This is in Fig. 1 indicated by the relative to the substrate U obliquely extending lines.
- the Suction box 32 but also the task to stabilize the ejected from the blow box 28 air flow 34, in particular to keep the surface of the substrate U by also sucks them from the blower passage 36. This is in Fig. 1 indicated by the contrasting from the underground U small arrows.
- a conditioning device in the form of a square bar 38 This conditioning strip 38 has the task of lifting the uppermost layers of the air boundary layer G, before the subsurface regions of the air boundary layer are supplied to the suction box 32.
- the suction device 30 can be provided poorer in performance and thus more cost.
- the strength of the air boundary layer G after the conditioning strip 38 no longer varies as much as a function of the operating parameters of the application device 10, as is the case without the conditioning strip 38.
- Fig. 2 is still nachzutragen that the blowing device 26, the blow box 28, the air feeds on both sides. That is, the supply line 28c divides into two branch lines 28d and 28e which open into the suction box 28 with respect to the transverse direction or working width direction Q of the substrate U in its drive-side end face 28f or guide-side end face 28g.
- the supply line 28c divides into two branch lines 28d and 28e which open into the suction box 28 with respect to the transverse direction or working width direction Q of the substrate U in its drive-side end face 28f or guide-side end face 28g.
- the air from the suction box 32 of the suction device 30 is only at one.
- Front side 32a of the suction box 32 sucked, and although preferably on the drive-side end face of the suction box 32, as in Fig. 3 is shown.
- Fig. 1 is still nachzutragen that the web 20 is guided around a support roller 40 in the region of the blowing device 26.
- the air boundary layer G is subjected to a centrifugal force which seeks to detach it from the material web 20, which facilitates the action of the blowing device 26 on the air boundary layer G.
- the web 20 of the support roller 40 is fed from below, so as not to disturb the application medium curtain 18 in its flow behavior.
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Auftragen von flüssigem oder pastösem Auftragsmedium mittels eines Auftragswerks auf einen laufenden Untergrund, wobei der Untergrund bei direktem Auftrag die Oberfläche einer Materialbahn, insbesondere aus Papier oder Karton, und bei indirektem Auftrag die Oberfläche eines Übertragselements, vorzugsweise einer Übertragswalze, ist, welches das Auftragsmedium dann an die Oberfläche der Materialbahn überträgt, und wobei in Laufrichtung des Untergrundes vor dem Auftragswerk eine Vorrichtung zur Schwächung der von dem Untergrund mitgeführten Luftgrenzschicht angeordnet ist.The invention relates to a device for applying liquid or pasty application medium by means of a commissioned work on a running surface, wherein the substrate for direct application, the surface of a material web, in particular of paper or cardboard, and for indirect application, the surface of a transfer element, preferably a transfer roller, is, which then transfers the application medium to the surface of the material web, and wherein in the running direction of the substrate in front of the commissioned work a device for weakening the entrained by the underground air boundary layer is arranged.
Obgleich die vom Untergrund mitgeführte Luftgrenzschicht auch bei anderen Typen von Auftragswerken das Auftragsergebnis nachteilig beeinflussen kann, wird die Erfindung nachfolgend am Beispiel einer Vorhang-Auftragsvorrichtung näher diskutiert werden, d.h. einer Auftragsvorrichtung, bei welcher das Auftragswerk das Auftragsmedium als sich im Wesentlichen schwerkraftbedingt bewegenden Vorhang oder Schleier an den Untergrund abgibt.Although the subsurface airlaid boundary layer may adversely affect the order result for other types of coater, the invention will be further discussed below using the example of a curtain coater, i. an applicator device in which the applicator dispenses the application medium to the substrate as a curtain or veil that moves essentially by gravity.
Bei der Beschichtung von Materialbahnen unter Einsatz eines Vorhang-Auftragswerks (in der Fachwelt auch als "Curtain Coating" bekannt) wird das Auftragsmedium an den Untergrund in Form eines Auftragsmedium-Vorhangs abgegeben, der sich im Wesentlichen schwerkraftbedingt vom Auftragswerk zum Untergrund bewegt. Dass das Vorhang-Auftragswerk sich dabei in einem vorbestimmten Abstand vom Untergrund befindet, hat unter anderem den Vorteil, dass es beispielsweise bei einem Bahnabriss einem geringeren Beschädigungsrisiko ausgesetzt ist. Vorhang-Auftragswerke unterscheiden sich von anderen "kontaktlosen" Auftragswerken, beispielsweise Freistrahl-Düsenauftragswerken, bei welchen die Bewegung des Auftragsmediums vom Auftragswerk zum Untergrund hauptsächlich vom Ausstoßimpuls aus der Abgabedüse des Auftragswerks herrührt, grundlegend, da die Gestalt des aus der Abgabedüse austretenden Vorhangs lediglich dem Wechselspiel zwischen der Oberflächenspannung des Auftragsmediums und der Schwerkraft ausgesetzt ist. Die Oberflächenspannung versucht dabei, den Vorhang, der bezogen auf sein Volumen bzw. seine Querschnittsfläche eine sehr große Oberfläche bzw. Umfangslänge aufweist, zusammenzuziehen, um so seine Oberfläche zu verringern. Diesem Effekt widersetzt sich lediglich die Schwerkraft, die den Vorhang zu strecken sucht. Es ist daher leicht einzusehen, dass es umso schwieriger ist, einen über die gesamte Arbeitsbreite gleichmäßig dicken Auftrgasmedium-Vorhang zu erhalten, je größer diese Arbeitsbreite ist.In the coating of webs using a curtain applicator (also known in the art as "curtain coating"), the application medium is delivered to the substrate in the form of a coating medium curtain, which moves substantially by gravity from the commissioned work to the ground. The fact that the curtain applicator is located at a predetermined distance from the ground, among other things, has the advantage that it is exposed to a lower risk of damage, for example, in a web break. Curtain coats differ from other "contactless" coater sets, such as free-jet jet coaters, where the movement the application medium to the substrate mainly results from the ejection pulse from the delivery nozzle of the commissioned work, fundamentally, since the shape of the discharge from the dispensing nozzle curtain is exposed only to the interplay between the surface tension of the coating medium and gravity. The surface tension tries to contract the curtain, which has a very large surface or circumferential length in relation to its volume or its cross-sectional area, so as to reduce its surface area. This effect is resisted only by gravity, which seeks to stretch the curtain. It is therefore easy to see that it is all the more difficult to obtain a uniformly over the entire working width Ansprgasmedium curtain, the larger this working width.
Die Beschichtung von Materialbahnen mittels eines Vorhang-Auftragswerks, das der Materialbahn das Auftragsmedium als sich im Wesentlichen schwerkraftbedingt bewegenden Auftragsmedium-Vorhang bzw. -Schleier zuführt, ist von der Beschichtung von photographischen Filmen, Tonbändern und dergleichen seit langem bekannt. Allerdings weisen die Materialbahnen auf diesen Anwendungsgebieten eine erheblich geringere Breite auf, als dies bei moderenen Anlagen zur Herstellung von Papier- und Pappebahnen der Fall ist, bei denen Materialbahnbreiten von mehr als 10 m gefordert werden. Einen über diese Breite gleichmäßig dicken Auftragsmedium-Vorhang bilden und stabil halten zu können, ist eine Aufgabe, bei der es alles andere als naheliegt, sich von den vergleichsweise einfach zu kontrollierenden bekannten schmalen Auftragsmedium-Vorhängen Anregungen für eine funktionstaugliche Lösung zu erwarten. Darüber hinaus bewegen sich die Materialbahnen in modernen Anlagen zur Herstellung von Papier- und Pappebahnen mit Geschwindigkeiten von bis zu 3000 m/min, was ein Vielfaches der Geschwindigkeit ist, mit der sich die bekannten schmalen Materialbahnen bewegen, und überdies eine weitere hohe Belastung für die Stabilität des Auftragsmedium-Vorhangs darstellt.The coating of webs by means of a curtain applicator, which feeds the web to the application medium as a substantially gravitationally moving application medium curtain, has long been known from the coating of photographic films, tapes, and the like. However, the webs in these applications have a significantly smaller width than is the case with modern systems for the production of paper and paperboard webs, in which web widths of more than 10 m are required. Forming a uniformly thick application medium curtain over this width and being able to hold it in a stable manner is a task in which it is far from obvious to expect suggestions for a functional solution from the comparatively easy-to-control known narrow application medium curtains. In addition, the webs move in modern paper and paperboard production lines at speeds of up to 3000 m / min, which is many times the speed at which the known narrow webs move, and also a further high load on the Stability of the application medium curtain.
Die
Aus der
Zum weiteren Stand der Technik sei der Vollständigkeit halber noch auf die
Demgegenüber ist es Aufgabe der vorliegenden Erfindung, die Auftragsvorrichtungen für den Einsatz in Anlagen zur Herstellung oder/und Veredelung von breiten und sich schnell bewegenden Materialbahnen, vorzugsweise aus Papier oder Karton, weiter zu verbessern, insbesondere was die Schwächung des Einflusses der Luftgrenzschicht anbelangt.In contrast, it is an object of the present invention, the application devices for use in plants for the production and / or finishing of wide and fast-moving material webs, preferably made of paper or cardboard, to further improve, in particular as regards the weakening of the influence of the air boundary layer.
Diese Aufgabe wird erfindungsgemäß gelöst durch eine Vorrichtung gemäß dem Anspruch 1.This object is achieved by a device according to claim 1.
Der Einsatz alleine einer Blasvorrichtung und der Einsatz alleine einer Absaugvorrichtung zur Verbesserung der Schwächung der Luftgrenzschicht sind an sich aus der Hauptanmeldung
Einem derartigen Verschleiß kann erfindungsgemäß durch den kombinierten Einsatz einer Blasvorrichtung und einer dieser in Laufrichtung der Materialbahn vorgeordneten Absaugvorrichtung vorgebeugt werden. Die Blasvorrichtung hat zum einen die Aufgabe, die an der Oberfläche des laufenden Untergrunds mitgeführte Luftgrenzschichtvorzuschwächen. Zum anderen unterstützt sie die Wirkung der Blasvorrichtung, indem sie den von dieser ausgestoßenen Luftstrom ansaugt und dadurch in seiner Bewegung längs des Untergrunds stabilisiert. Insbesondere weist die erfindungsgemäße Schwächungsvorrichtung keine gegen die Oberfläche der Materialbahn angestellte, d.h. diese berührende, Schwächungselemente auf, sondern ist frei von derartigen Elementen. In diesem Sinne ist die erfindungsgemäße Schwächungsvorrichtung eine rein bzw. ausschließlich berührungslos arbeitende Schwächungsvorrichtung.Such wear can be prevented according to the invention by the combined use of a blowing device and one of these upstream in the running direction of the material web suction device. The blower has the one hand, the task vorzuschwächen the entrained on the surface of the current underground air boundary layer. On the other hand, it supports the action of the blowing device, by sucking the air flow emitted by this and thereby stabilized in its movement along the ground. In particular, the weakening device according to the invention does not have any weakening elements set against the surface of the material web, ie, these contacting, but is free of such elements. In this sense, the weakening device according to the invention is a purely or exclusively non-contact weakening device.
Die erfindungsgemäß eingesetzte Blasvorrichtung kann einen Blaskasten umfassen, dem im Bereich beider Seitenränder des Untergrunds Luft zugeführt wird. Durch diese beidseitige und vorzugsweise symmetrische Luftzufuhr in den Blaskasten kann ein über die Arbeitsbreite des Untergrunds im Wesentlichen gleichmäßiger Luftstrom erhalten werden, der sich der vom Untergrund mitgeführten Luftgrenzschicht entgegengesetzt gerichtet bewegt. Die Austrittsdüse der Blasvorrichtung kann dabei eine Schlitzdüse oder eine Mehrzahl von Einzeldüsen umfassen.The blowing device used according to the invention may comprise a blow box to which air is supplied in the region of both side edges of the substrate. By this two-sided and preferably symmetrical air supply into the blow box, a substantially uniform over the working width of the ground air flow can be obtained, which moves in the opposite direction carried by the entrained air boundary layer. The outlet nozzle of the blowing device may comprise a slot nozzle or a plurality of individual nozzles.
In analoger Weise kann die erfindungsgemäß eingesetzte Absaugvorrichtung einen Saugkasten umfassen, aus dem lediglich im Bereich eines der Seitenränder des Untergrunds, vorzugsweise im Bereich des triebseitigen Seitenrands, Luft abgesaugt wird. Diese Weiterbildung der Erfindung macht sich zunutze, dass die Absaugvorrichtung hauptsächlich der Vorschwächung der Luftgrenzschicht dient. Daher kann ohne Weiteres auf eine konstruktiv aufwendige und dementsprechend kostspielige beidseitige Absaugung verzichtet werden.In an analogous manner, the suction device used according to the invention may comprise a suction box from which air is sucked off only in the region of one of the side edges of the substrate, preferably in the region of the drive-side side edge. This development of the invention makes use of the fact that the suction device mainly serves to pre-weaken the air boundary layer. Therefore, a structurally complex and therefore costly two-sided extraction can be dispensed with without further notice.
Um durch die Wirkung der Blasvorrichtung auch die Stabilität des Auftragsmediums-Vorhangs verbessern zu können, wird in Weiterbildung der Erfindung vorgeschlagen, dass das dem Auftragswerk zugewandte Ende der Blasvorrichtung in Laufrichtung des Untergrunds von der Auftreffposition des Auftragsmediums auf dem Untergrund einen Abstand von zwischen etwa 10 mm und etwa 50 mm aufweist.In order to improve the stability of the coating medium curtain by the effect of the blowing device, the invention proposes that the applicator end facing the blowing device in the direction of the substrate from the impact position of the application medium on the ground a distance of between about 10th mm and about 50 mm.
Wenn die Blasvorrichtung eine Leitwand aufweist, die in einem vorbestimmten Abstand von dem laufenden Untergrund angeordnet ist, so kann durch diese Leitwand in Zusammenwirkung mit dem Untergrund ein Blaskanal gebildet werden, in dem die von der Blasvorrichtung ausgestoßene Luft der Laufrichtung des Untergrunds entgegengesetzt gerichtet strömt. Hierdurch kann die Effizienz der Einwirkung des von der Blasvorrichtung ausgestoßenen Luftstroms auf die vom Untergrund mitgeführte Luftgrenzschicht verbessert werden. Dieser Effekt ist besonders wirksam, wenn die Leitwand in Laufrichtung des Untergrunds eine Länge von zwischen etwa 300 mm und etwa 500 mm aufweist. Dies entspricht dann, wenn die Blasvorrichtung im Bereich einer Stützwalze angeordnet ist, um welche die Materialbahn zumindest teilweise herumgeführt ist, je nach Walzendurchmesser einem Umschlingungswinkel von etwa 90°.If the blowing device has a guide wall which is arranged at a predetermined distance from the running substrate, a blowing channel can be formed through this guide wall in cooperation with the substrate, in which the air ejected from the blowing device flows in the opposite direction to the running direction of the substrate. As a result, the efficiency of the action of the ejected from the blowing air flow on the surface entrained air boundary layer can be improved. This effect is particularly effective when the baffle in the direction of the ground has a length of between about 300 mm and about 500 mm. This corresponds to when the blowing device is arranged in the region of a support roller, around which the material web is guided at least partially, depending on the roll diameter a wrap angle of about 90 °.
In Weiterbildung der Erfindung wird vorgeschlagen, dass die Absaugvorrichtung in Laufrichtung des Untergrunds von dem ihr zugewandten Ende der Leitwand bzw. der Blasvorrichtung einen Abstand von zwischen etwa 0 mm und etwa 50 mm aufweist. Die Blasvorrichtung und die Absaugvorrichtung können somit in Laufrichtung des Untergrunds sowohl unmittelbar aneinander anschließen (Abstand: 0 mm) als auch einen vorbestimmten Abstand voneinander haben, so dass die Saugvorrichtung nicht notwendigerweise die gesamte von der Blasvorrichtung ausgestoßene Luft absaugen können muss.In a further development of the invention it is proposed that the suction device in the running direction of the ground from the end facing the guide wall or the blowing device has a distance of between about 0 mm and about 50 mm. The blowing device and the suction device can thus both directly adjoin (distance: 0 mm) and have a predetermined distance from one another in the running direction of the ground, so that the suction device does not necessarily have to be able to extract all the air expelled from the blowing device.
Vorteilhaft ist es ferner, wenn der Schwächungsvorrichtung eine Konditionierungsvorrichtung vorgeordnet ist, welche die obersten Schichten der Luftgrenzschicht im Wesentlichen vollständig entfernt. Üblicherweise hängt die Effizienz der Schwächungsvorrichtung von verschiedenen Einflüssen ab, beispielsweise der Laufgeschwindigkeit des Untergrunds. Die Konditionierungsvorrichtung sorgt durch die Entfernung der obersten Bereiche der Luftgrenzschicht dafür, dass die Abhängigkeit von diesen Einflüssen gemindert, wenn nicht gar vollständig unterbunden wird. Zudem braucht die Schwächungsvorrichtung nicht mehr gegen die gesamte Luftgrenzschicht vorzugehen, sondern nur noch gegen den von der Konditionierungsvorrichtung durchgelassenen Teil. Hierdurch wird die Schwächungsvorrichtung entlastet und kann entsprechend leistungsärmer ausgebildet sein.It is also advantageous if the attenuation device is preceded by a conditioning device which substantially completely removes the uppermost layers of the air boundary layer. Usually, the efficiency of the weakening device depends on various factors, for example the running speed of the ground. By removing the uppermost areas of the air boundary layer, the conditioning device ensures that dependency on these influences is minimized, if not completely eliminated. In addition, the weakening device does not need to proceed against the entire air boundary layer, but only against the transmitted by the conditioning device part. As a result, the weakening device is relieved and can be designed correspondingly lower power.
In einer einfachen Ausführungsform kann die Konditionierungsvorrichtung eine sich in Querrichtung des Untergrunds erstreckende Leiste umfassen, die beispielsweise von einem einfachen Blechstreifen gebildet sein kann. Es ist jedoch auch möglich, dass die Konditionierungsvorrichtung aerodynamische Effekte ausnutzt, beispielsweise indem sie in Querrichtung gesehen einen Querschnitt aufweist, der die Gestalt eines auf dem Kopf stehenden Tragflächenprofils hat.In a simple embodiment, the conditioning device may comprise a strip extending in the transverse direction of the substrate, which may for example be formed by a simple metal strip. However, it is also possible for the conditioning device to exploit aerodynamic effects, for example by having a transverse cross-section which has the shape of an inverted airfoil profile.
Gute Ergebnisse können beispielsweise dann erzielt werden, wenn die Konditionierungsvorrichtung vom Untergrund in einem Abstand von zwischen etwa 3 mm und etwa 10 mm angeordnet ist. Die Konditionierungsvorrichtung kann selbsttragend ausgebildet oder auch an der Schwächungsvorrichtung angebracht sein.Good results can be achieved, for example, if the conditioning device is located from the ground at a distance of between about 3 mm and about 10 mm. The conditioning device may be self-supporting or attached to the attenuation device.
Wie vorstehend bereits erwähnt, kann die erfindungsgemäße Schwächungsvorrichtung insbesondere bei einer Auftragsvorrichtung eingesetzt werden, welche ein Vorhang-Auftragswerk aufweist, d.h. ein Auftragswerk, welches das Auftragsmedium als sich im Wesentlichen schwerkraftbedingt bewegenden Vorhang oder Schleier an den Untergrund abgibt.As already mentioned above, the weakening device according to the invention can be used in particular in an applicator device which has a curtain applicator, i. a commissioned work which emits the application medium as a curtain or veil moving essentially by gravity to the ground.
Festzuhalten ist ferner, dass unter dem Begriff "Luft" im Zusammenhang mit der vorliegenden Beschreibung jedes Gas oder Gasgemisch verstanden werden kann, das geeignet ist, die vom Untergrund mitgeführte Luftgrenzschicht in schwächendem Sinne zu beeinflussen. Beispielsweise könnte anstelle von Luft auch Stickstoffgas verwendet werden. Der Einsatz von Luft als Behandlungsgas ist lediglich deshalb bevorzugt, weil Druckluft in nahezu jeder Maschinenhalle ohnehin und somit ohne zusätzliche Infrastrukturmaßnahmen und kostengünstig zur Verfügung steht.It should also be noted that the term "air" in the context of the present description, any gas or gas mixture can be understood, which is capable of affecting the entrained air boundary layer in a weakening sense. For example, nitrogen gas could be used instead of air. The use of air as a treatment gas is only preferred because compressed air in almost every machine hall anyway and thus without additional infrastructure and cost is available.
Zur Schwächung der Luftgrenzschicht kann zusätzlich oder alternativ ferner vorgesehen sein, dass die Materialbahn im Bereich der Schwächungsvorrichtung, vorzugsweise im Bereich oder unmittelbar vor dem Luftaustritt der Blasvorrichtung, einen gekrümmten Verlauf nimmt. Beispielsweise kann die Materialbahn um eine Stützwalze oder/und um ein Stützband oder/und um einen Stützschuh herumgeführt sein. In Folge des gekrümmten Verlaufs unterliegt die Luftgrenzschicht Fliehkräften, welche die Luftgrenzschicht von der Materialbahn abzuheben suchen und somit die Einwirkung der Schwächungsvorrichtung, insbesondere der Blasvorrichtung, auf die Luftgrenzschicht erleichtern. Der Krümmungsradius des gekrümmten Verlaufs kann dabei zwischen etwa 300 mm und etwa 500 mm betragen. Je kleiner der Krümmungsradius ist, desto größer ist zwar auch die erzeugte Fliehkraft, in der Praxis ist dem Krümmungsradius jedoch durch das Durchbiegungsverhalten der Materialbahn eine untere Grenze gesetzt. Und nach oben sind dem Krümmungsradius zum einen durch die Abnahme der Fliehkraft und zum anderen durch Bauraum-Überlegungen Grenzen gesetzt.To weaken the air boundary layer, additionally or alternatively, it may further be provided that the material web is in the region of the weakening device, preferably in the region or directly in front of the air outlet the blowing device, a curved course takes. For example, the material web may be guided around a support roller and / or around a support belt and / or around a support shoe. As a result of the curved course, the air boundary layer is subject to centrifugal forces which seek to lift the air boundary layer away from the material web and thus facilitate the action of the weakening device, in particular the blowing device, on the air boundary layer. The radius of curvature of the curved course can be between about 300 mm and about 500 mm. The smaller the radius of curvature, the greater the centrifugal force generated, but in practice the radius of curvature has a lower limit due to the deflection behavior of the material web. And upwards, the radius of curvature is limited on the one hand by the decrease in centrifugal force and, on the other, by space considerations.
Um von der Bahnführung herrührende Störungen des Fließverhaltens des Auftragsmedium-Vorhangs möglichst klein halten zu können, wird schließlich vorgeschlagen, dass die Materialbahn der Auftreffposition des Auftragsmediums auf den Untergrund von unten her zugeführt wird. Steht ausreichender Bauraum zur Verfügung, so ist grundsätzlich jedoch auch eine Zuführung von oben her denkbar.In order to minimize disturbances in the flow behavior of the application medium curtain caused by the web guide, it is finally proposed that the material web be fed to the impact position of the application medium on the substrate from below. If sufficient installation space is available, however, in principle it is also conceivable to supply it from above.
Die Erfindung wird im Folgenden an einem Ausführungsbeispiel anhand der beigefügten Zeichnung näher erläutert werden. Es stellt dar:
- Fig. 1
- eine grobschematische Seitenansichten einer erfindungs- gemäßen Auftragsvorrichtungen;
- Fig. 2 und 3
- schematische, in Laufrichtung genommene Ansichten des Untergrunds einer Blasvorrichtung (
Fig. 2 ) und einer Absaugvorrichtung (Fig. 3 ).
- Fig. 1
- a rough schematic side views of an inventive applicators;
- FIGS. 2 and 3
- schematic, in the running direction views of the bottom of a blowing device (
Fig. 2 ) and a suction device (Fig. 3 ).
In
Zur Schwächung der vom Untergund U an seiner Oberfläche mitgeführten Luftgrenzschicht G ist in Laufrichtung L vor dem Auftragswerk 12 eine Schwächungsvorrichtung 24 vorgesehen. Diese Schwächungsvorrichtung 24 umfasst zum einen eine Blasvorrichtung 26 mit einem Blaskasten 28 und zum anderen eine Absaugvorrichtung 30 mit einem Saugkasten 32.To weaken the air boundary layer G entrained by the substrate U on its surface, a weakening
Der Blaskasten 28 ist bezogen auf die Laufrichtung L des Untergrunds U unmittelbar stromaufwärts des Auftragswerks 12 und insbesondere des Auftragsmedium-Vorhangs 18 angeordnet. Insbesondere weist die Blasdüse 28a vom Auftragsmedium-Vorhang 18 einen Abstand a auf, der vorzugsweise zwischen etwa 10 mm und etwa 50 mm beträgt. Die Blasdüse 28a stößt einen zur Laufrichtung L entgegengesetzt gerichteten Luftstrom 34 aus, der sich in einem von einer Leitwand 28b des Blaskastens 28 und dem Untergrund U gebildeten Blaskanal 36 bewegt und den Einfluss der Luftgrenzschicht G auf den Auftragsmedium-Vorhang 18 schwächt. Diese Leitwand 28b weist eine Länge b von zwischen etwa 300 mm und etwa 500 mm auf.The
In einem Abstand c ist bezogen auf die Laufrichtung L stromaufwärts des Blaskastens 28 der Saugkasten 32 angeordnet. Dieser Saugkasten 32 hat zum einen die Aufgabe, die Luftgrenzschicht G zu schwächen, indem er sie vom Untergrund U absaugt. Dies ist in
Schließlich ist in
Mit Bezug auf
Demgegenüber wird die Luft aus dem Saugkasten 32 der Saugvorrichtung 30 lediglich an einer. Stirnseite 32a des Saugkastens 32 abgesaugt, und zwar vorzugsweise an der triebseitigen Stirnseite des Saugkastens 32, wie dies in
Zu
Claims (15)
- Device (10) for applying liquid or pasty application medium (16) to a moving substrate (U) by means of an applicator (12),
the substrate (U) in the case of direct application being the surface (20a) of a web (20), in particular of paper or board, and in the case of indirect application being the surface of a transfer element, preferably a transfer roll, which then transfers the application medium to the surface of the web, and
a device (24) for weakening the air boundary layer (G) carried along by the substrate (U) being arranged before the applicator (12) in the direction of movement (L) of the substrate (U),
the weakening device (24) comprising a blowing device (26) and an extraction device (30),
the blowing device (26) being arranged before the applicator (12) in the direction of movement (L) of the substrate (U) and discharging an air stream (34) aimed counter to the direction of movement (L),
the extraction device (30) being arranged before the blowing device (26) in the direction of movement (L) of the substrate (U) and extracting at least part of the air stream (34) produced by the blowing device (26) and also at least part of the air boundary layer (G) carried along by the substrate (U), and
the blowing device (26) having a guide wall (28b), which is arranged at a predetermined distance (3b) from the moving substrate (U) in order to form a blowing channel (36) between the guide wall (28b) and the substrate (U), in which channel the air stream (34) discharged by the blowing device (26) moves. - Application device according to Claim 1,
characterized in that the device (10) applies liquid or pasty application medium (16) to the moving substrate (U) by means of a curtain applicator (12). - Application device according to Claim 1 or 2,
characterized in that the blowing device (26) comprises a blower box (28), to which air is supplied in the region of both side edges of the substrate (U). - Application device according to one of the preceding claims,
characterized in that the extraction device (30) comprises a suction box (32), from which air is extracted only in the region of one of the side edges of the substrate (U), preferably in the region of the drive-side edge. - Application device according to one of the preceding claims,
characterized in that the end of the blowing device (26) which faces the applicator (12) has a distance (a) from the impingement position (P) of the application medium (16) on the substrate (U) of between about 10 mm and about 50 mm in the direction of movement (L) of the substrate (U). - Application device according to one of the preceding claims,
characterized in that the guide wall (28b) has a length (b) of between about 300 mm and about 500 mm in the direction of movement (L) of the substrate (U). - Application device according to one of the preceding claims,
characterized in that the extraction device (30) has a distance (c) of between about 0 mm and about 50 mm from the end of the guide wall (28b) and the blowing device (26) that faces it in the direction of movement (L) of the substrate (U). - Application device according to one of the preceding claims,
characterized in that the outlet nozzle (28a) of the blowing device (26) comprises a slot nozzle or a plurality of individual nozzles. - Application device according to one of the preceding claims,
characterized in that a conditioning device (38), which removes the uppermost layers of the air boundary layer (G) substantially completely, is arranged upstream of the weakening device (24). - Application device according to Claim 9,
characterized in that the conditioning device (38) comprises a bar extending in the transverse direction (Q) of the substrate (U). - Application device according to Claim 9 or 10,
characterized in that the conditioning device (38) is arranged at a distance of between about 3 mm and about 10 mm from the substrate (U). - Application device according to one of the preceding claims,
characterized in that the substrate (U) assumes a curved course in the area of the weakening device (24), preferably in the area of or immediately before the air outlet (28a) of the blowing device (26). - Application device according to Claim 12,
characterized in that the web (20) is led around a supporting roll (40) and/or around a supporting belt and/or around a supporting shoe. - Application device according to Claim 12 or 13,
characterized in that the radius of curvature (R) of the curved course is between about 300 mm and about 500 mm. - Application device according to one of the preceding claims,
characterized in that the substrate (U) is fed from below to the impingement position (P) of the application medium (16) on the substrate (U).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2001125376 DE10125376A1 (en) | 2000-03-14 | 2001-05-23 | Paper or carton curtain-coating assembly has combined suction/blower unit disrupting air boundary layer over moving web |
| DE10125376 | 2001-05-23 | ||
| PCT/EP2002/005621 WO2002094452A2 (en) | 2001-05-23 | 2002-05-22 | Application device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1432525A2 EP1432525A2 (en) | 2004-06-30 |
| EP1432525B1 true EP1432525B1 (en) | 2010-04-07 |
Family
ID=7686014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02771657A Expired - Lifetime EP1432525B1 (en) | 2001-05-23 | 2002-05-22 | Application device |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US7037375B2 (en) |
| EP (1) | EP1432525B1 (en) |
| JP (1) | JP4020198B2 (en) |
| AT (1) | ATE463620T1 (en) |
| DE (1) | DE50214344D1 (en) |
| WO (1) | WO2002094452A2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004056271A1 (en) * | 2004-11-22 | 2006-05-24 | Basf Ag | Arrangement and method for curtain coating of moving substrates |
| DE102010001616A1 (en) | 2010-02-05 | 2011-08-11 | Voith Patent GmbH, 89522 | applicator |
| FI20105915A0 (en) * | 2010-08-31 | 2010-08-31 | Metso Paper Inc | METHOD AND EQUIPMENT FOR HANDLING THE FIBER |
| DE102011079568A1 (en) | 2011-07-21 | 2013-01-24 | Voith Patent Gmbh | Curtain coating comprises removing moving air boundary layer, which is located at inlet side of curtain applicator and adjustably running from fibrous material web, from web side to be coated, using air-boundary layer-control device |
| DE102017101373B4 (en) * | 2017-01-25 | 2022-02-03 | Voith Patent Gmbh | Curtain applicator and method for applying an application medium |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3424884C1 (en) * | 1984-07-06 | 1986-02-20 | Du Pont de Nemours (Deutschland) GmbH, 4000 Düsseldorf | Device for applying at least one pouring layer and method for operating this device |
| DE3706542A1 (en) | 1987-02-28 | 1988-09-08 | Voith Gmbh J M | AIR GUIDE BOX FOR THE DRYING PART OF A HIGH SPEED PAPER MACHINE |
| US4821429A (en) | 1987-11-30 | 1989-04-18 | J. M. Voith, Gmbh | Air guide box for stabilizing the run of a web, for instance a paper web |
| FI108061B (en) * | 1995-10-05 | 2001-11-15 | Metso Paper Inc | Method for coating a paper or cardboard web |
| DE19716647A1 (en) | 1997-04-21 | 1998-10-22 | Jagenberg Papiertech Gmbh | Method and device for applying a pigment coating ink to a paper or cardboard web |
| DE19800954A1 (en) * | 1998-01-13 | 1999-07-15 | Voith Sulzer Papiertech Patent | Device for direct or indirect application of a liquid or pasty application medium to a running material web, in particular made of paper or cardboard |
| DE19803240A1 (en) | 1998-01-28 | 1999-07-29 | Voith Sulzer Papiertech Patent | Paint curtain applicator |
| DE19903559B4 (en) | 1998-01-30 | 2004-02-26 | Mitsubishi Paper Mills Limited | Process and apparatus for curtain coating |
| DE19827030A1 (en) * | 1998-06-17 | 1999-12-23 | Voith Sulzer Papiertech Patent | Application device |
| DE19829449A1 (en) * | 1998-07-01 | 2000-01-05 | Voith Sulzer Papiertech Patent | Application device and application method |
| JP4113985B2 (en) | 1998-07-22 | 2008-07-09 | 富士フイルム株式会社 | Application method and apparatus |
| JP3625254B2 (en) * | 1998-12-11 | 2005-03-02 | 三菱製紙株式会社 | Coating device |
| FI115295B (en) | 1999-09-01 | 2005-04-15 | Metso Paper Inc | Curtain coating device and curtain coating method |
| DE10012347A1 (en) | 2000-03-14 | 2001-09-20 | Voith Paper Patent Gmbh | Curtain coating applicator for a moving paper/cardboard web has electrodes at given electrical potentials to generate magnetic fields to affect the coating medium flow between the applicator and web surface in direct or indirect coating |
| DE10012257A1 (en) | 2000-03-14 | 2001-09-20 | Voith Paper Patent Gmbh | Coating equipment for paper or card manufacture or finishing, includes air boundary layer reduction unit in form of suction device with sliding resilient sections |
| JP3676182B2 (en) * | 2000-04-03 | 2005-07-27 | 三菱重工業株式会社 | Coating apparatus and coating method |
| JP4403632B2 (en) * | 2000-04-27 | 2010-01-27 | 株式会社Ｉｈｉ | Curtain coater air cut device |
| DE20023954U1 (en) | 2000-11-22 | 2007-12-06 | Voith Patent Gmbh | Curtain coater |
| FI115314B (en) * | 2001-03-13 | 2005-04-15 | Metso Paper Inc | Arrangement for handling paper or cardboard |
-
2002
- 2002-05-22 JP JP2002591160A patent/JP4020198B2/en not_active Expired - Fee Related
- 2002-05-22 WO PCT/EP2002/005621 patent/WO2002094452A2/en active Application Filing
- 2002-05-22 DE DE50214344T patent/DE50214344D1/en not_active Expired - Lifetime
- 2002-05-22 EP EP02771657A patent/EP1432525B1/en not_active Expired - Lifetime
- 2002-05-22 AT AT02771657T patent/ATE463620T1/en active
-
2003
- 2003-11-18 US US10/716,303 patent/US7037375B2/en not_active Expired - Fee Related
-
2005
- 2005-11-17 US US11/281,171 patent/US7326301B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE463620T1 (en) | 2010-04-15 |
| US7037375B2 (en) | 2006-05-02 |
| WO2002094452A3 (en) | 2004-03-11 |
| US20040107899A1 (en) | 2004-06-10 |
| JP4020198B2 (en) | 2007-12-12 |
| DE50214344D1 (en) | 2010-05-20 |
| WO2002094452A2 (en) | 2002-11-28 |
| US7326301B2 (en) | 2008-02-05 |
| US20060065190A1 (en) | 2006-03-30 |
| JP2004531387A (en) | 2004-10-14 |
| EP1432525A2 (en) | 2004-06-30 |
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