EP1385635B1 - Device for suctioning an air boundary layer from a running web of material and apparatus for coating a running web using said suction device - Google Patents
Device for suctioning an air boundary layer from a running web of material and apparatus for coating a running web using said suction device Download PDFInfo
- Publication number
- EP1385635B1 EP1385635B1 EP02727525A EP02727525A EP1385635B1 EP 1385635 B1 EP1385635 B1 EP 1385635B1 EP 02727525 A EP02727525 A EP 02727525A EP 02727525 A EP02727525 A EP 02727525A EP 1385635 B1 EP1385635 B1 EP 1385635B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- seal
- outlet
- suction box
- suction
- 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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Classifications
-
- 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
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S118/00—Coating apparatus
- Y10S118/04—Curtain coater
Definitions
- the invention relates to a device for extracting an air boundary layer of a running, deflected by a roller material web and a device for coating a moving material web with such a suction device.
- curtain coaters For coating of running webs such as paper or board webs, plastic or metal foils, so-called curtain coaters are known in which the coating material (adhesive dispersions, pigment coating, etc.) is applied from a slot in a free-falling curtain on the web.
- the coating material adheresive dispersions, pigment coating, etc.
- the air boundary layer adhering to the web causes problems, especially at high web speeds of more than 400 mlmin.
- the air boundary layer adhering to the web causes irregular fluctuations of the curtain and leads to trapped air which leads to unevenness in the coating thickness.
- a curtain coater for the production of photographic materials in which in front of the slot nozzle, a shield-shaped element ("air shield”) is arranged, which serves to remove the air boundary layer.
- the element is arranged in the region of a deflection roller for the web and extends arcuately curved over a certain angular range of the guide roller.
- the element is designed so that in the inlet area and the outlet area zones are determined in which the air resistance is greater than in a zone between the two areas. In the zone between the areas with greater air resistance, there is a chamber connected to a suction pump to reduce the pressure is.
- the distance between the sealing elements at the inlet and outlet side and the guide roller is between 0.5 mm and 2 mm.
- the distance between the outlet end of the shield-shaped element and the curtain is between 5 mm and 30 mm.
- the invention has for its object to provide a device which makes it possible to reduce the air boundary layer of a wide (3 m and more) web at high web speeds (1000 m / min and more) so that a subsequently arranged curtain coater evenly apply the coating material.
- the coating device shown in the figures is used to apply a dispersion adhesive (eg an acrylate) in aqueous solution to a siliconized paper web 1. Because of its advantageous properties, the device can also be used for applying other dispersions on paper, plastic films or use thin strips or to coat paper or board webs with coating color.
- a dispersion adhesive eg an acrylate
- the coating apparatus includes a slot nozzle 2 which is suspended above the run of the web 1 in a rack.
- the slit nozzle 2 is connected to a supply for coating material and has on its underside a slot-shaped opening from which the coating material emerges and forms a free-falling curtain 3, which falls on the web surface.
- the width of the slot nozzle 2 is greater than the width of the web 1 to be coated.
- the web 1 is deflected by a deflection roller 4 which extends in its axial length over the entire working width of the coating device, i.e. the maximum width of a web 1 to be coated, extends.
- edge troughs 5 are arranged below the slot nozzle, which limit the curtain 3 to the desired coating width.
- the edge troughs are each attached to the frame of the nozzle 2, so that they are moved in a displacement of the nozzle 2 in or against the running direction.
- the coating material separated off at the edges of the curtain is collected and removed against the running direction of the web in a drip pan 6.
- the drip pan 6 is arranged immediately in front of the deflection roller 4.
- the slot nozzle 2 is in its working position above the guide roller 4 ( FIG. 1 ) or just behind it ( FIG. 3 ) emotional.
- the embodiment according to FIG. 1 serves to apply a coating with a width less than the web width. On the coated web 1 so remain coating-free edges.
- the web 1 is coated over its entire width.
- the curtain 3 is wider than the web 1.
- the slit nozzle 2 is located in its working position at a distance behind the apex line of the guide roller 4, so that below the curtain 3, a trough 7 can be arranged, from which the laterally collected next to the web edges coating material becomes.
- the web 1 is guided horizontally in the region below the slot nozzle 2 and then deflected downwards by a second deflection roller 8.
- a suction device is arranged at a small distance in the web running direction in front of the slot 2, which in the Figures 2 and 4 is shown enlarged.
- a suction box 8 is arranged, which is the guide roller 4 - ie to the web 1 - open and connected via at least one opening into the rear wall suction line 9 to a suction fan.
- the suction box 8 extends in its width over the entire axial length of the guide roller 4. At its inlet side, it has an inlet seal 10 and at its outlet side an outlet seal 11 which extend over the axial length of the guide roller 4 and with the web. 1 form a gap 12, 13. At least the end of the inlet seal 10 and the beginning of the outlet seal 11 are located in the deflection of the web 1 on the guide roller 4.
- the suction box 8 includes a frontal seal 14, which is parallel to the outside of the front side at a small distance from this extends.
- the sealing elements 14 extend with a width of at least 10 mm, preferably more than 15 mm, measured radially to the deflecting roller 4 into the frontal region of the deflecting roller 4.
- the outlet seal 11 is arranged and designed so that an outlet gap 13 forms with the web 1, the height and length measured in the web running direction over the entire width of the suction box 8, ie over the entire axial length of the guide roller 4, is substantially constant.
- the length of the outlet gap 13 is more than 10 mm, preferably more than 30 mm, in particular 50 mm - 70 mm.
- the height of the outlet gap 13 is chosen as a function of the web speed so that the value of the product web speed (in m / min) x gap height (in mm) is less than 1500. At a web speed of 1000 m / min, the gap height is thus less than 1.5 mm.
- the measured over the roll circumference distance between the end of the inlet seal 10 and the beginning of the outlet seal 11 is 50 mm - 500 mm.
- the air boundary layer is sucked by the negative pressure in the suction box 8 of the web 1. It has been found that the suction is improved when the inlet seal 10 and the outlet seal 11 are designed so that they each have a sharp edge at its inlet and outlet ends.
- At least the outlet seal 11 is therefore at its inlet and designed their sharp-edged outlet, preferably, the inlet seal 10 at least at its outlet end on a correspondingly sharp edge.
- wall 15 is arranged, which extends across the entire width of the suction box 8.
- the wall 15 is formed by a perforated plate which separates the rear region of the suction chamber 8 with the suction line 9 from the front region, which is open to the web 1 out. The wall 15 additionally stabilizes the construction of the suction box 8.
- a corona charging electrode 16 is arranged in the suction box 8, which is connected to a high voltage source.
- a corona charging electrode and its use for peeling off a gaseous laminar boundary layer is described in detail in US Pat EP 0837824 B1 described.
- the charging electrode 8 extends across the width of the suction box 8 and has a series of parallel aligned tips 17 which are directed towards the web 1.
- the applied high voltage causes 16 emerge from the tips 17 of the charging electrode electrons or positrons, which generate turbulence in the air boundary layer and thus stir it up.
- the tips 17 extend as close as possible to the web 1, wherein the distance to the web 1 0.1 mm - 10 mm, preferably 1 mm - 5 mm. The distance across the web 1 between two tips 17 is about 5 mm.
- the coating device shown in the suction box 8 is in each case arranged so that the distance from the end of the outlet seal 11 to the exiting the slot 2 curtain 3 10 mm - 200 mm, preferably 20 mm - 70 mm. At this distance, on the one hand ensures that no new disturbing air boundary layer builds up on the way the train to the curtain 3, on the other disturbances of the curtain 3 are avoided by sucking air into the outlet gap 13.
- Suction box 8 shown formed extended at its end. The end of the suction box 8 with the outlet seal 11 extends over the apex line of the guide roller 4 of time.
- the upper boundary of the suction box 8 is designed so that it protrudes only slightly over the circumference of the guide roller 4 upwards. This makes it possible to arrange the edge troughs 5 above the suction box 8 immediately above the web run so that they run slightly downwards against the web running direction, so that the collected coating material runs into the trough 6.
- the suction box 8 is pivoted away from the deflection roller 4, so that a new web 1 can be introduced into the coating apparatus. In addition, its open to the web 1 front is accessible for maintenance.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Coating Apparatus (AREA)
- Paper (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zum Absaugen einer Luftgrenzschicht von einer laufenden, von einer Walze umgelenkten Materialbahn sowie einer Vorrichtung zum Beschichten einer laufenden Materialbahn mit einer derartigen Absaugevorrichtung.The invention relates to a device for extracting an air boundary layer of a running, deflected by a roller material web and a device for coating a moving material web with such a suction device.
Zum Beschichten von laufenden Materialbahnen wie Papier- oder Kartonbahnen, Kunststoff- oder Metallfolien sind sogenannte Curtain-Coater bekannt, bei denen das Beschichtungsmaterial (Klebstoffdispersionen, Pigmentstreichfarbe etc.) aus einer Schlitzdüse in einem freifallenden Vorhang auf die Materialbahn aufgetragen wird. Um mit einem Curtain-Coater sehr gleichmäßig zu beschichten, ist es erforderlich, daß der aus der Schlitzdüse fallende Vorhang stabil, ohne Schwankungen und ohne Lufteinschlüsse auf die Bahn aufgelegt wird. Dabei bereitet die an der Bahn anhaftende Luftgrenzschicht insbesondere bei hohen Bahngeschwindigkeiten von mehr als 400 mlmin Probleme. Die an der Bahn anhaftende Luftgrenzschicht löst unregelmäßige Schwankungen des Vorhangs aus und führt zu Lufteinschlüssen, die zu Ungleichmäßigkeiten in der Beschichtungsdicke führen.For coating of running webs such as paper or board webs, plastic or metal foils, so-called curtain coaters are known in which the coating material (adhesive dispersions, pigment coating, etc.) is applied from a slot in a free-falling curtain on the web. In order to coat very evenly with a curtain coater, it is necessary that the curtain falling from the slot nozzle be placed on the web stably, without fluctuations and without air inclusions. The air boundary layer adhering to the web causes problems, especially at high web speeds of more than 400 mlmin. The air boundary layer adhering to the web causes irregular fluctuations of the curtain and leads to trapped air which leads to unevenness in the coating thickness.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, die es ermöglicht, die Luftgrenzschicht von einer breiten (3 m und mehr) Bahn bei hohen Bahngeschwindigkeiten (1000 m/min und mehr) so zu vermindern, daß ein nachfolgend angeordneter Curtain-Coater das Beschichtungsmaterial gleichmäßig aufträgt.The invention has for its object to provide a device which makes it possible to reduce the air boundary layer of a wide (3 m and more) web at high web speeds (1000 m / min and more) so that a subsequently arranged curtain coater evenly apply the coating material.
Diese Aufgabe wird dadurch gelöst, daß im Bereich einer die Materialbahn umlenkenden Walze ein Saugkasten mit folgenden Merkmalen angeordnet ist:
- Der sich in seiner Breite über die axiale Länge der Umlenkwalze erstreckende Saugkasten ist zur Umlenkwalze hin offen und an ein Sauggebläse angeschlossen,
- er weist eine einlaufseitige und eine auslaufseitige Dichtung auf, die jeweils einen Spalt mit der Bahn bilden und sich über die axiale Länge der Umlenkwalze erstrekken, wobei sich zumindest das Ende der einlaufseitigen Dichtung und der Anfang der auslaufseitigen Dichtung im Umlenkungsbereich der Bahn auf der Umlenk-
- walze befinden,
- an jeder Stirnseite der Umlenkwalze enthält der Saugkasten eine stirnseitige Dichtung, die sich außen neben der Stirnseite parallel mit geringem Abstand von dieser erstreckt,
- die auslaufseitige Dichtung bildet mit der Bahn einen Auslaufspalt, dessen Höhe und in Bahnlaufrichtung gemessene Länge über die gesamte Breite des Saugkastens im wesentlichen konstant ist, wobei die Länge mehr als 10 mm, vorzugsweise mehr als 30 mm, insbesondere 50 mm - 70 mm, beträgt und die Spalthöhe in Abhängigkeit von der Bahngeschwindigkeit so gewählt ist, daß der Wert des Produkts Bahngeschwindigkeit (in m/min) x Spalthöhe (in mm) kleiner als 1500 ist.
- der über den Walzenumfang gemessene Abstand zwischen dem Ende der Einlaufdichtung (10) und dem Anfang der Auslaufdichtung (11) mehr als 10 mm, vorzugsweise 50 mm-500 mm, beträgt.
- The suction box extending in its width over the axial length of the guide roller is open towards the guide roller and connected to a suction fan,
- it has an inlet-side and an outlet-side seal, each forming a gap with the web and extending over the axial length of the guide roller, wherein at least the end of the inlet-side seal and the beginning of the outlet-side seal in the deflection region of the web on the deflection
- roller,
- on each end face of the deflecting roller, the suction box contains an end-side seal, which extends parallel to the outside of the end face at a small distance therefrom,
- the outlet-side seal forms with the web an outlet gap whose height and length measured in the web running direction over the entire width of the suction box is substantially constant, the length is more than 10 mm, preferably more than 30 mm, in particular 50 mm - 70 mm and the gap height is selected as a function of the web speed such that the value of the product web speed (in m / min) x gap height (in mm) is less than 1500.
- the distance measured between the end of the inlet seal (10) and the beginning of the outlet seal (11) measured over the roll circumference is more than 10 mm, preferably 50 mm-500 mm.
Nach der Erfindung wird kein sogenannter "air shield", sondern ein Saugkasten eingesetzt, um die Luftgrenzschicht abzusaugen. Dabei hat sich gezeigt, daß für die Absaugwirkung die Gestaltung der auslaufseitigen Dichtung von entscheidender Bedeutung ist. Diese wird in Abhängigkeit von der Bahngeschwindigkeit so angeordnet und gestaltet, daß die Luftgrenzschicht auf der Bahn und auf den Rändern der Umlenkwalze unmittelbar hinter der Dichtung sehr weitgehend verringert ist. Der Vorhang aus Beschichtungsmaterial eines in diesem Bereich angeordneten Curtain-Coaters wird somit nicht mehr störend beeinträchtigt.According to the invention, no so-called "air shield", but a suction box is used to suck the air boundary layer. It has been shown that the design of the outlet-side seal is of crucial importance for the suction effect. This is arranged and designed in dependence on the web speed so that the air boundary layer on the web and on the edges of the deflecting roller immediately after the seal is very largely reduced. The curtain of coating material of a arranged in this area curtain coater is thus no longer disturbing impaired.
Die Unteransprüche enthalten bevorzugte, da besonders vorteilhafte Ausgestaltungen der Erfindung.The subclaims contain preferred, as particularly advantageous embodiments of the invention.
Nachfolgend wird die Erfindung anhand von Ausführungsbeispielen näher erläutert, die in der Zeichnung grob schematisch dargestellt sind.
Figur 1- zeigt die Seitenansicht eines Curtain-Coaters, bei dem die Schlitzdüse so angeordnet ist, daß der Vorhang entlang der Scheitellinie einer die Bahn abstützenden Umlenkwalze auf die Bahn fällt.
Figur 2- zeigt in vergrößerter Darstellung die Vorrichtung zum Absaugen der Luftgrenzschicht.
Figur 3- zeigt einen Curtain-Coater, bei dem der Vorhang aus Beschichtungsmaterial hinter der Umlenkwalze auf die Bahn fällt.
Figur 4- zeigt die Absaugevorrichtung des Curtain-Coaters nach
in vergrößerter Darstellung.Figur 3
- FIG. 1
- shows the side view of a curtain coater, wherein the slot nozzle is arranged so that the curtain along the apex line of a web supporting the deflection roller falls on the web.
- FIG. 2
- shows an enlarged view of the device for extracting the air boundary layer.
- FIG. 3
- shows a curtain coater in which the curtain of coating material falls behind the guide roller on the web.
- FIG. 4
- shows the suction device of the curtain coater after
FIG. 3 in an enlarged view.
Die in den Figuren dargestellte Beschichtungsvorrichtung dient zum Auftragen eines Dispersionshaftklebstoffes (z. B. eines Acrylats) in wässriger Lösung auf eine silikonisierte Papierbahn 1. Aufgrund ihrer vorteilhaften Eigenschaften läßt sich die Vorrichtung auch zum Auftragen anderer Dispersionen auf Papier, Kunststoffolien oder dünne Bänder oder zum Beschichten von Papier- oder Kartonbahnen mit Streichfarbe einsetzen.The coating device shown in the figures is used to apply a dispersion adhesive (eg an acrylate) in aqueous solution to a siliconized
Die Beschichtungsvorrichtung enthält eine Schlitzdüse 2, die oberhalb des Laufs der Bahn 1 in einem Gestell aufgehängt ist. Die Schlitzdüse 2 ist an eine Zufuhr für Beschichtungsmaterial angeschlossen und weist an ihrer Unterseite eine schlitzförmige Öffnung auf, aus der das Beschichtungsmaterial austritt und einen freifallenden Vorhang 3 bildet, der auf die Bahnoberfläche fällt. Die Breite der Schlitzdüse 2 ist größer als die Breite der zu beschichtenden Bahn 1. Vor der Schlitzdüse 2 wird die Bahn 1 von einer Umlenkwalze 4 umgelenkt, die sich in ihrer axialen Länge über die gesamte Arbeitsbreite der Beschichtungsvorrichtung, i.e. die maximale Breite einer zu beschichtenden Bahn 1, erstreckt.The coating apparatus includes a
An beiden Längsseiten der Beschichtungsvorrichtung sind unterhalb der Schlitzdüse 2 Randrinnen 5 angeordnet, die den Vorhang 3 auf die gewünschte Beschichtungsbreite begrenzen. Die Randrinnen sind jeweils am Gestell der Düse 2 befestigt, so daß sie bei einer Verschiebung der Düse 2 in oder gegen Bahnlaufrichtung mitbewegt werden. In den Randrinnen 5 wird das an den Vorhangrändern abgetrennte Beschichtungsmaterial aufgefangen und gegen Bahnlaufrichtung in eine Auffangwanne 6 abgeführt. Die Auffangwanne 6 ist unmittelbar vor der Umlenkwalze 4 angeordnet. Beim Start des Beschichtungsvorganges wird die Schlitzdüse 2 mit den an ihr befestigten Elementen in den Bereich oberhalb der Auffangwanne 6 bewegt. Dort wird zunächst ein stabiler Vorhang 3 erzeugt, der in die Auffangwanne 6 fällt. Anschließend wird die Schlitzdüse 2 in ihre Arbeitsposition oberhalb der Umlenkwalze 4 (
Die Ausführungsform nach
The embodiment according to
Zum Absaugen der Luftgrenzschicht von der Bahn 1 und den Rändern der Umlenkwalze 4 ist mit geringem Abstand in Bahnlaufrichtung vor der Schlitzdüse 2 eine Absaugevorrichtung angeordnet, die in den
Im Umlenkungsbereich der Umlenkwalze 4 ist ein Saugkasten 8 angeordnet, der zur Umlenkwalze 4 - also zur Bahn 1 - hin offen ist und über mindestens eine in die Rückwand mündende Saugleitung 9 an ein Sauggebläse angeschlossen ist. Der Saugkasten 8 erstreckt sich in seiner Breite über die gesamte axiale Länge der Umlenkwalze 4. An seiner Einlaufseite weist er eine Einlaufdichtung 10 und an seiner Auslaufseite eine Auslaufdichtung 11 auf, die sich jeweils über die axiale Länge der Umlenkwalze 4 erstrecken und mit der Bahn 1 einen Spalt 12, 13 bilden. Zumindest das Ende der Einlaufdichtung 10 und der Anfang der Auslaufdichtung 11 befinden sich im Umlenkungsbereich der Bahn 1 auf der Umlenkwalze 4. An jeder Stirnseite der Umlenkwalze 4 enthält der Saugkasten 8 eine stirnseitige Dichtung 14, die sich außen neben der Stirnseite parallel mit geringem Abstand von dieser erstreckt. Für eine ausreichende Abdichtung an den Stirnseiten erstrecken sich die Dichtelemente 14 mit einer radial zur Umlenkwalze 4 gemessenen Breite von mindestens 10 mm, vorzugsweise mehr als 15 mm, in den stirnseitigen Bereich der Umlenkwalze 4 hinein.In the deflection of the
Die Auslaufdichtung 11 ist so angeordnet und gestaltet, daß sich ein Auslaufspalt 13 mit der Bahn 1 bildet, dessen Höhe und in Bahnlaufrichtung gemessene Länge über die gesamte Breite des Saugkastens 8, also über die gesamte axiale Länge der Umlenkwalze 4, im wesentlichen konstant ist. Die Länge des Auslaufspalts 13 beträgt mehr als 10 mm, vorzugsweise mehr als 30 mm, insbesondere 50 mm - 70 mm. Die Höhe des Auslaufspalts 13 wird in Abhängigkeit von der Bahngeschwindigkeit so gewählt, daß der Wert des Produkts Bahngeschwindigkeit (in m/min) x Spalthöhe (in mm) kleiner als 1500 ist. Bei einer Bahngeschwindigkeit von 1000 m/min ist die Spalthöhe somit geringer als 1,5 mm.The
Der über den Walzenumfang gemessene Abstand zwischen dem Ende der Einlaufdichtung 10 und dem Anfang der Auslaufdichtung 11 beträgt 50 mm - 500 mm. In diesem Bereich wird die Luftgrenzschicht durch den Unterdruck in dem Saugkasten 8 von der Bahn 1 abgesaugt. Es hat sich gezeigt, daß die Absaugung verbessert wird, wenn die Einlaufdichtung 10 und die Auslaufdichtung 11 so gestaltet sind, daß sie jeweils an ihrem Einlauf- und Auslaufende eine scharfe Kante aufweisen. Zumindest die Auslaufdichtung 11 ist daher an ihrem Einlauf- und ihrem Auslaufende scharfkantig gestaltet, bevorzugt weist auch die Einlaufdichtung 10 zumindest an ihrem Auslaufende eine entsprechend scharf gestaltete Kante auf.The measured over the roll circumference distance between the end of the
Für eine gleichmäßige Verteilung des Unterdrucks in der Saugkammer 8 ist in dieser zumindest eine mit regelmäßig verteilten Öffnungen versehene Wand 15 angeordnet, die sich quer über die gesamte Breite des Saugkastens 8 erstreckt. Bevorzugt wird die Wand 15 von einem Lochblech gebildet, der den hinteren Bereich der Saugkammer 8 mit der Saugleitung 9 von dem vorderen Bereich abtrennt, der zur Bahn 1 hin geöffnet ist. Die Wand 15 stabilisiert zusätzlich den Aufbau des Saugkastens 8.For a uniform distribution of the negative pressure in the
Zur weiteren Verbesserung des Ablösens der Luftgrenzschicht ist in dem Saugkasten 8 eine Korona-Aufladeelektrode 16 angeordnet, die mit einer Hochspannungsquelle verbunden ist. Eine derartige Korona-Aufladeelektrode und ihre Verwendung zum Ablösen einer gasförmigen laminaren Grenzschicht ist ausführlich in der
Bei den in den
Vorteilhafterweise ist die obere Begrenzung des Saugkastens 8 so gestaltet, daß er nur wenig über den Umfang der Umlenkwalze 4 nach oben hinausragt. Dies ermöglicht es, die Randrinnen 5 oberhalb des Saugkastens 8 unmittelbar oberhalb des Bahnlaufs so anzuordnen, daß sie etwas gegen die Bahnlaufrichtung nach unten geneigt verlaufen, damit das aufgefangene Beschichtungsmaterial in die Wanne 6 abläuft. Bevorzugt ist der Saugkasten 8 von der Umlenkwalze 4 abschwenkbar gelagert, damit eine neue Bahn 1 in die Beschichtungsvorrichtung eingeführt werden kann. Zusätzlich wird so seine zur Bahn 1 hin offene Vorderseite für Wartungsarbeiten zugänglich.Advantageously, the upper boundary of the
Claims (8)
- Device for sucking an air boundary layer away from a moving material web (1) deflected by a roll (4), having a suction box (8) which is arranged in the region of the deflecting roll (4) and which has the following features:a) the suction box (8) extends in its width over the axial length of the deflection roll (4), is open towards the deflection roll (4) and is connected to a suction fan,b) it has a seal (10, 11) on the inlet side and outlet side, which each form a gap (12, 13) with the web (1) and extend over the axial length of the deflection roll (4), at least the end of the seal (10) on the inlet side and the start of the seal (11) on the outlet side being located in the deflection region of the web (1) on the deflection roll (4),c) at each end of the deflection roll (4), the suction box (8) has an end seal (14), which extends on the outside beside the end, parallel to and at a short distance from the latter,d) the seal (11) on the outlet side is able to form an outlet gap (13) with the web (1), the height of which and the length of which, measured in the web running direction, are substantially constant over the entire width of the suction box (8), the length being more than 10 mm, preferably more than 30 mm, in particular 50 mm - 70 mm, and the gap height as a function of the web speed (m/min) x gap height (in mm) being less than 1500, ande) the distance, measured over the circumference of the roll, between the end of the inlet seal (10) and the start of the outlet seal (11) is 50 mm - 500 mm.
- Device according to Claim 1, characterized in that the outlet seal (11) is configured with a sharp edge at its inlet end and its outlet end.
- Device according to either of Claims 1 and 2, characterized in that in the suction chamber (8) there is arranged a wall (15) extending transversely and provided with openings, which separates the rear region having the suction line (9) from the front region which is open towards the web (1).
- Device according to one of Claims 1 to 3, characterized in that the suction box (8) is mounted such that it can be pivoted away from the deflection roll (4).
- Device according to one of Claims 1 to 4, characterized in that in the suction box (8) there is arranged a corona discharge electrode (16) having a series of tips oriented parallel to the web (1), which is connected to a high-voltage source.
- Device according to Claim 5, characterized in that the tips (17) of the electrode (16) have a spacing from the web (1) of 0.1 mm - 10 mm, preferably 1 mm - 5 mm.
- Apparatus for coating a moving material web (1), having a slot nozzle (2), from which the coating material emerges in a free-falling curtain (3), and a device arranged in front of the slot nozzle (2) for removing the air boundary layer adhering to the web (1), characterized in that, in the web running direction, a device according to one of Claims 1 to 6 is arranged in front of the slot nozzle (2).
- Apparatus according to Claim 7, characterized in that the suction box (8) is arranged in such a way that the distance from the end of the outlet seal (11) to the curtain (3) emerging from the slot nozzle (2) is 10 mm - 200 mm, preferably 20 mm - 70 mm.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10117667 | 2001-04-09 | ||
DE10117667A DE10117667A1 (en) | 2001-04-09 | 2001-04-09 | Device for extracting an air boundary layer from a running material web |
PCT/EP2002/003775 WO2002081102A1 (en) | 2001-04-09 | 2002-04-05 | Device for suctioning an air boundary layer from a running web of material |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1385635A1 EP1385635A1 (en) | 2004-02-04 |
EP1385635B1 true EP1385635B1 (en) | 2012-09-12 |
Family
ID=7680953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02727525A Expired - Lifetime EP1385635B1 (en) | 2001-04-09 | 2002-04-05 | Device for suctioning an air boundary layer from a running web of material and apparatus for coating a running web using said suction device |
Country Status (4)
Country | Link |
---|---|
US (1) | US7175710B2 (en) |
EP (1) | EP1385635B1 (en) |
DE (1) | DE10117667A1 (en) |
WO (1) | WO2002081102A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI115732B (en) * | 2003-06-05 | 2005-06-30 | Metso Paper Inc | Method and apparatus for surface sizing of paper or board |
DE102004023575A1 (en) * | 2004-05-13 | 2005-12-15 | Voith Paper Patent Gmbh | Device for applying one or both sides of at least one liquid or pasty application medium to a running surface |
DE102004062330A1 (en) | 2004-12-20 | 2006-06-22 | Tlt-Turbo Gmbh | Device for extracting a near-wall air boundary layer |
US7707963B2 (en) * | 2006-03-31 | 2010-05-04 | 3M Innovative Properties Company | System for forming multi-layer films using corona treatments |
US8281734B2 (en) * | 2006-05-02 | 2012-10-09 | Dow Corning Ireland, Ltd. | Web sealing device |
JP2009535514A (en) * | 2006-05-02 | 2009-10-01 | ダウ・コーニング・アイルランド・リミテッド | Fluid exchange system |
FI123510B (en) * | 2008-12-15 | 2013-06-14 | Metso Paper Inc | Arrangement for restoration of a press fabric in a fiber web machine |
US8590479B2 (en) | 2011-07-25 | 2013-11-26 | Transform Pack Inc. | Preserving seasoning flavour profiles during the manufacturing of food-seasoning sheets |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3347378A (en) * | 1966-06-14 | 1967-10-17 | Ajem Lab Inc | Filter apparatus |
FR2000001A1 (en) * | 1968-07-31 | 1969-08-29 | Eastman Kodak Co | |
FI59637C (en) * | 1979-11-20 | 1981-09-10 | Valmet Oy | ANORDNING I TORKPARTIET AV EN PAPPERSMASKIN |
DE3710143A1 (en) * | 1987-03-31 | 1988-10-13 | Jagenberg Ag | RAIL FEEDER ON ROLLING MACHINES |
EP0440279A1 (en) * | 1990-01-29 | 1991-08-07 | Agfa-Gevaert N.V. | Curtain coater for photographic elements |
DE69026097T2 (en) * | 1990-12-12 | 1996-10-02 | Agfa Gevaert Nv | Curtain coater |
DE4116222A1 (en) * | 1991-05-17 | 1992-11-19 | Voith Gmbh J M | RAILWAY APPARATUS |
DE4141296A1 (en) * | 1991-12-14 | 1993-06-17 | Voith Gmbh J M | Papermaking drying section - has suction box with structured sealing bar positions to detach web and carrier belt together from the drying cylinder surface |
DE9211302U1 (en) * | 1992-08-22 | 1992-10-08 | Hoechst Ag, 6230 Frankfurt | Device for generating a negative pressure |
DE19525453A1 (en) * | 1995-07-13 | 1997-01-16 | Eltex Elektrostatik Gmbh | Device for removing the gaseous laminar boundary layer |
EP0906789B1 (en) * | 1997-10-03 | 2001-09-19 | TSE Troller Schweizer Engineering AG | Process and apparatus for curtain coating of a travelling support |
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 |
-
2001
- 2001-04-09 DE DE10117667A patent/DE10117667A1/en not_active Withdrawn
-
2002
- 2002-04-05 US US10/474,789 patent/US7175710B2/en not_active Expired - Fee Related
- 2002-04-05 EP EP02727525A patent/EP1385635B1/en not_active Expired - Lifetime
- 2002-04-05 WO PCT/EP2002/003775 patent/WO2002081102A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2002081102A1 (en) | 2002-10-17 |
US7175710B2 (en) | 2007-02-13 |
DE10117667A1 (en) | 2002-10-10 |
EP1385635A1 (en) | 2004-02-04 |
US20040112282A1 (en) | 2004-06-17 |
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