EP1782891B1 - Method of and apparatus for deposition of at least two layers of coating colour onto the surface of a moving web, in particular a paper or cardboard web - Google Patents
Method of and apparatus for deposition of at least two layers of coating colour onto the surface of a moving web, in particular a paper or cardboard web Download PDFInfo
- Publication number
- EP1782891B1 EP1782891B1 EP06122981A EP06122981A EP1782891B1 EP 1782891 B1 EP1782891 B1 EP 1782891B1 EP 06122981 A EP06122981 A EP 06122981A EP 06122981 A EP06122981 A EP 06122981A EP 1782891 B1 EP1782891 B1 EP 1782891B1
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- European Patent Office
- Prior art keywords
- web
- coating
- curtain
- colour
- curtain coating
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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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- 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
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
Definitions
- the present invention relates to a method and a device for at least two-layer application of coating color on the surface of a moving web, in particular paper or board web, using a coating device, in which for the at least two-layer application of coating color at least two arranged at any distance Vorhangstreichkexcellent which are each coating color down to the web provided and wherein on a guide plate on which the successively from the above Vorhangstreichgropfen in the direction of an inclined plane of the guide plate down respective coating colors to form a layer of at least two layers of paint in the course of their movement over the oblique plane are laminated and said color layers are delivered in the form of a color curtain to the surface of the moving web.
- a coating color or coating composition or a coating medium is applied to a serving as a base paper base sheet using a coater and then dried.
- the devices used in the coating application for this purpose are referred to as coating machines.
- squeegee element by means of squeegee element include the high maintenance and other associated costs due to, for example, the large amount of coating ink penetrating the paper, and further due to the wear of the doctor elements. This wear is caused, for example, by the fluid pressure and pressure forces acting on the application of the coating color.
- curtain coater in which a curtain-shaped coating film from a curtain coating head comprising a spray nozzle chamber for forming a curtain film of coating paint is applied to a traveling web to form a coating layer
- curtain coaters have been used in the field of photographic printing paper production for many years, curtain coaters in the paper industry often remain unused due to the instability of the coating, which is due to the instability of the coating curtain due to draft, bubble entrapment and lack of mechanical precision at high operating speeds.
- curtain coaters over the prior art post-mark coaters include simplified maintenance by eliminating wearing parts such as doctoring elements, ie blades and round spreading bars, simple high-precision setting of the application amount, improved operability and a strong improvement in surface properties in relation to the outline stroke.
- FIG.4 shows a major part cross-section of a two-layer curtain coater used for this purpose.
- the coating colors ta, tb are applied from above Vorhangstreichköpfen a, b as color curtains ca, cb in a direction of the arrow moving web w and form on the surface of the web w a two-layer line consisting of the layers sa, sb.
- a coating layer is usually formed as a first layer on the film surface, and the coating layer sb is usually formed as a second layer on the surface of the first coating layer sa.
- FIG. 5 shows the cross section of a known two-layer coating device.
- the coating colors ta, tb are dispensed from a dual curtain coating head c as overlapped two-layer color curtains ca, cb, following in the same manner as in FIG FIG. 4 a two-layer coating layer sa, sb on the surface a running web w is formed.
- the known device is at different composition of the coating colors ta, tb, the first layer ca of the color curtain wider than the web w, the other layer cb of the color curtain, which is narrower than the web w, does not flow over the web w.
- the overflowing color ta can be collected and recycled for reuse for the application of a coating layer same recipe for liquid feed. Note that during free fall, the color curtain will shrink in width due to changes in surface tension.
- the present invention has for its object to avoid the disadvantages of the prior art.
- the object of the invention is achieved by a method and a device such that the curtain coating heads are laterally displaceable to the web, wherein the width of the coating discharged from one of the Vorhangstreichköpfe width is greater than the web width, the width of the dispensed from the other Vorhangstreichkopf coating color is smaller than the web width and an offset sensor for detecting the roll misalignment of the web is provided.
- the position of the two curtain coating heads in the lateral direction is controlled by signals supplied by the displacement sensor so that it corresponds to the rolling offset of the web.
- the beneficial effects of the coater and coating method of the present invention include, for example, facilitating a trouble-free stroke even with skew-related paper misalignment and further enabling easy color recovery and system rinse with water before and after brushing.
- the coating device according to the invention is a coating device 1 for the two-layer application of coating colors provided in the example to a moving, ie traveling web w.
- the device 1 includes two curtain coating heads 1a, 1b arranged at any desired distance from each other for the downwardly directed delivery of corresponding coating colors.
- the symbol 2 refers to a guide plate, on which the two successive Vorhangstreichkopf 1a, 1b down in the direction of an inclined plane 2a successively applied coating colors are laminated so that they in the course of their movement over the inclined plane 2a in a corresponding order form multi-layered or here two-layer paint layer.
- a downward-pointing curtain guide 2b is provided at the lower end of said inclined plane 2a.
- This curtain guide directs the curtain down onto the surface of the web w where a uniform laminated overlay sa resulting from the curtain ca and an upper overlay sb resulting from the curtain cb are formed.
- the color curtain ca is wider than the web w and, as in FIG. 3 (A) to see, on both sides of the web w out flowing portion of the color curtain ca in a paint tray 3 is collected.
- the apparatus includes means for recovering the coating color to independently collect and recycle all ink discharged from the curtain coating heads 1a, 1b prior to coating the web.
- the ink recovery means includes a paint tray 4a which is wider than the ink discharged from the curtain coating head 1a and intended for the recovery of the total amount of ink and water discharged by the curtain coating head 1a, and a color tray 4b which is wider than the ink discharged from the curtain coating head 1b the recovery of the total quantity of paint and water discharged by the curtain coating head 1a is determined, using a pump, not shown in the figures, the entire collected in the ink pans 4a, 4b color returns to the corresponding raw material supply systems. It should be mentioned that in FIG. 3 (B) only the guide plate 2 is moved.
- the curtain coating heads 1a, 1b are displaceable in the lateral direction of the web w. That is, the curtain coating heads 1a, 1b have a sliding part 5.
- the sliding part 5, which includes a rail 5a and an engaging part 5b engaging in the rail 5a, is driven by an actuator 8.
- the actuator 8 may be a hydraulic cylinder or a servo cylinder.
- the width of the ink discharged from the curtain coating head la is greater than the width of the web w, and the width of the ink discharged from the curtain coating head 1b is smaller than the width of the web w.
- the symbol 6 denotes an offset sensor for detecting the roll offset of the web w.
- the offset sensor 6 may, for example, represent a device for detecting the position of a web edge using a CCD camera.
- the offset sensor 6 sends signals to a controller 7 and sends control signals to the actuators 8, 8a, 8b of the curtain coaters 1a, 1b to laterally change the position of the curtain coaters 1a, 1b to match the skew offset of FIG Train correspond.
- the solid line indicates the mean position of the web w
- the broken line indicates the curl thereof
- x indicates the distance between the middle position and the offset position.
- the center positions of the curtain coating heads 1a, 1b are shown with solid lines, and the state after the movement made by the actuators 8a, 8b is indicated by the broken lines. The size of this movement (adjustment path) corresponds to x.
- the coating color can be easily recovered before and after painting and the system rinsed with water become.
- the width of the ink discharged from the curtain coating head la larger than the web width and the width of the ink discharged from the curtain coating head 1b smaller than the web width, whereby their color remains all on the web w, even if the two curtain coating heads have separate colors use, the color can be easily recovered without mixing between the color curtain cb and the over the two edges of the web w out flowing portions of the color curtain ca.
- the present invention is not limited to the embodiment described above, and accordingly, a number of changes can be made thereto within the spirit of the present invention.
- a CCD camera as an offset sensor
- other types of sensors such as a photoelectric cell sensor may be used.
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- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Paper (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren und eine Vorrichtung zum wenigstens zweischichtigen Auftrag von Streichfarbe auf die Oberfläche einer laufenden Bahn, insbesondere Papier- oder Kartonbahn, unter Verwendung einer Streichvorrichtung, bei der für den wenigstens zweischichtigen Auftrag von Streichfarbe wenigstens zwei in beliebigem Abstand zueinander angeordnete Vorhangstreichköpfe, die jeweils Streichfarbe nach unten an die Bahn abgeben vorgesehen sind und wobei auf einem Führungsblech, auf dem die von den vorgenannten Vorhangstreichköpfen nacheinander in Richtung einer schiefen Ebene des Führungsbleches nach unten abgegebenen jeweiligen Streichfarben unter Ausbildung einer mindestens zweischichtigen Farbschicht im Zuge ihrer Bewegung über die schiefe Ebene laminiert werden und die besagten Farbschichten in Form eines Farbvorhanges an die Oberfläche der laufenden Bahn abgegeben werden.The present invention relates to a method and a device for at least two-layer application of coating color on the surface of a moving web, in particular paper or board web, using a coating device, in which for the at least two-layer application of coating color at least two arranged at any distance Vorhangstreichköpfe which are each coating color down to the web provided and wherein on a guide plate on which the successively from the above Vorhangstreichköpfen in the direction of an inclined plane of the guide plate down respective coating colors to form a layer of at least two layers of paint in the course of their movement over the oblique plane are laminated and said color layers are delivered in the form of a color curtain to the surface of the moving web.
Bei der Herstellung einer gestrichenen Bahn, insbesondere gestrichener Papiere, wie allgemeiner Druckpapiere für den Einsatz in Katalogen und ähnlichem sowie druck-und wärmeempfindlicher Papiere, wird mit Hilfe einer Streichmaschine eine Streichfarbe bzw. Streichmasse bzw. ein Auftragsmedium auf eine als Streichrohpapier dienende Bahn aufgetragen und danach getrocknet. Die beim Streichmassenauftrag dafür verwendeten Vorrichtungen werden als Streichmaschinen bezeichnet. Die bis heute am häufigsten eingesetzten Arten von Streichmaschinen, zu denen Rakel-, Rollrakel- und Luftmesserstreichmaschinen gehören, verwenden ein Verfahren mit nachträglicher Gewichtsbestimmung basierend auf dem Auftrag einer überschüssigen Menge von Streichfarbe auf eine Bahn, der Entfernung der überschüssigen Streichfarbe durch Abstreifen mit einem Rakelelement bzw. einer Rakelklinge oder einem dünnen runden Verstreichstab oder ähnlichem oder durch Abblasen mit Luftbürste bzw. Luftmesser sowie der anschließenden Gewichtsbestimmung der Papierbahn. Zu den inhärenten Problemen beim Streichen unter Verwendung eines Verfahrens mit nachträglicher Dosierung mittels Rakelelement gehören jedoch die hohen Wartungs- und damit verbundenen sonstigen Kosten infolge beispielsweise der großen das Papier durchdringenden Streichfarbmenge, und ferner infolge des Verschleißes der Rakelelemente. Dieser Verschleiß wird beispielsweise durch den Flüssigkeitsdruck und die Druckkräfte verursacht, die beim Auftrag der Streichfarbe wirken.In the production of a coated web, in particular coated papers, such as general printing papers for use in catalogs and the like and pressure-sensitive and heat-sensitive papers, a coating color or coating composition or a coating medium is applied to a serving as a base paper base sheet using a coater and then dried. The devices used in the coating application for this purpose are referred to as coating machines. The most common types of coating machines to date, including doctor, doctor and air knife coater, use a post-weight determination method based on applying an excess amount of coating to a web, removing the excess coating by doctor blade stripping or a doctor blade or a thin round dispensing rod or the like or by blowing off with air brush or air knife and the subsequent weight determination of the paper web. Among the problems inherent in painting using a post-dosing process However, by means of squeegee element include the high maintenance and other associated costs due to, for example, the large amount of coating ink penetrating the paper, and further due to the wear of the doctor elements. This wear is caused, for example, by the fluid pressure and pressure forces acting on the application of the coating color.
In den letzten Jahren erfolgt deshalb vermehrt der Einsatz von Vorhangstreichmaschinen, bei denen ein vorhangförmiger Streichmassenfilm von einem Vorhangstreichkopf, aufweisend eine Kammer mit Sprühdüse zur Ausbildung eines Vorhangfilms von Streichfarbe, auf eine laufende Materialbahn abgegeben wird und dort eine Auftragsschicht (z.B. Deckstrich) bildet. Obwohl Vorhangstreichmaschinen seit vielen Jahren auf dem Gebiet der Fotodruckpapierherstellung verwendet werden, bleiben Vorhangstreichmaschinen in der Papierindustrie infolge des instabilen Strichs oft noch ungenutzt, was durch die Instabilität des Streichfarbvorhangs infolge von Luftzug, Blaseneinschluss sowie mangelnder mechanischer Präzision bei hohen Betriebsgeschwindigkeiten bedingt ist.In recent years, therefore, the use of curtain coater in which a curtain-shaped coating film from a curtain coating head comprising a spray nozzle chamber for forming a curtain film of coating paint is applied to a traveling web to form a coating layer (e.g. Although curtain coaters have been used in the field of photographic printing paper production for many years, curtain coaters in the paper industry often remain unused due to the instability of the coating, which is due to the instability of the coating curtain due to draft, bubble entrapment and lack of mechanical precision at high operating speeds.
Zu den charakterisierenden Merkmalen von Vorhangstreichmaschinen, gegenüber den mit nachträglicher Gewichtsbestimmung arbeitenden Streichmaschinen nach dem Stand der Technik, gehören vereinfachte Wartung durch Wegfall von Verschleißteilen wie Rakelelemente, also Klingen und runde Verstreichstäbe, einfache hochpräzise Einstellung der Auftragsmenge, verbesserte Betriebsfähigkeit und eine starke Verbesserung der Oberflächeneigenschaften in Bezug auf den Konturstrich.The characterizing features of curtain coaters over the prior art post-mark coaters include simplified maintenance by eliminating wearing parts such as doctoring elements, ie blades and round spreading bars, simple high-precision setting of the application amount, improved operability and a strong improvement in surface properties in relation to the outline stroke.
Es wurden Versuche unternommen, unter Einsatz der beschriebenen Vorhangstreichtechnologie zwei oder mehr Schichten von Streichfarbe auf eine Bahn aufzubringen.
Beim Einsatz von Vorhangstreichmaschinen der dargestellten Art zur Herstellung von Fotofilmen oder ähnlichem, wo die Bahn w mit geringer Laufgeschwindigkeit (beispielsweise 120 m/min) bewegt wird, wird aufgrund der großen Differenz zwischen der Laufgeschwindigkeit des Films und der Fallgeschwindigkeit der Farbvorhänge ca, cb die Auftragsschicht sa gewöhnlich als erste Schicht auf der Filmoberfläche und die Auftragsschicht sb gewöhnlich als zweite Schicht auf der Oberfläche der ersten Auftragsschicht sa ausgebildet.When using curtain coater of the kind shown for producing photo films or the like, where the web w is moved at a low running speed (for example, 120 m / min), the color curtains ca, cb become due to the large difference between the running speed of the film and the falling speed A coating layer is usually formed as a first layer on the film surface, and the coating layer sb is usually formed as a second layer on the surface of the first coating layer sa.
Bei der Anwendung dieser Vorhangstreichvorrichtung auf eine Papierbahn w besteht jedoch eine große Differenz zwischen der hohen Bahnlaufgeschwindigkeit von 300 bis 1800 m/min und der Fallgeschwindigkeit der Streichfarbvorhänge ca, cb, die etwa 180 m/min beträgt. Da in diesem Falle der Streichfarbvorhang ca auf die Oberfläche der Bahn w nass auf trocken auftrifft, ist der dazwischen liegende Reibungskoeffizient groß genug, um die gleichförmige Farbausdehnung über die Oberfläche der Bahn w zu ermöglichen, was wiederum die normale Ausbildung einer gleichförmigen fehlerfreien in erster Schicht aufgetragenen Strichschicht sa ermöglicht. Da andererseits das Auftreffen des Streichfarbvorhangs cb auf die erste Auftragsschicht nass auf nass erfolgt, ist der Reibungskoeffizient zwischen beiden klein und das führt dementsprechend mitunter zur Entstehung von Schlupf und somit, weil keine ordnungsgemäße Ausdehnung entlang der Oberfläche der ersten Auftragsschicht sa ermöglicht wird, zur Ausbildung einer in zweiter Schicht aufgetragenen anormalen Strichschicht sb mit sichtbaren Fehlern.In the application of this curtain coater on a paper web w, however, there is a large difference between the high web running speed of 300 to 1800 m / min and the falling speed of the coating color curtains ca, cb, which is about 180 m / min. In this case, since the paint curtain c falls wet on the surface of the web w wet, the intervening friction coefficient is large enough to allow the uniform color expansion across the surface of the web w, which in turn provides the normal formation of a uniform defect-free first layer applied coating layer sa allows. On the other hand, since the impact of the coating color curtain cb on the first coating layer is wet to wet, the coefficient of friction between them is small, and thus sometimes leads to the occurrence of slippage and thus to formation because proper expansion along the surface of the first coating layer sa is not enabled an applied in the second layer abnormal coating layer sb with visible errors.
Für das Streichen mit zwei oder mehr Farbschichten ist neben der Vorrichtung / dem Verfahren, das aus der
Gemäß der bekannten Vorrichtung ist bei unterschiedlicher Zusammensetzung der Streichfarben ta, tb die erste Schicht ca des Farbvorhangs breiter als die Bahn w, wobei die andere Schicht cb des Farbvorhangs, die schmaler ist als die Bahn w, nicht über die Bahn w hinausströmt. Da infolge dessen nur ein einschichtiger Flüssigkeitsfilm (Farbvorhang) ca über die Kante der Bahn w hinweg abströmt, kann die überströmende Farbe ta aufgefangen und zur Wiederverwendung für den Auftrag einer Strichschicht gleicher Rezeptur zur Flüssigrohstoffzuführung rückgeführt werden. Zu beachten ist, dass der Farbvorhang während des freien Falls aufgrund von Änderungen in der Oberflächenspannung in der Breite schrumpft. Aus diesem Grund kommt es beim Streichen einer Bahn w, wenn die Breite des Vorhangs gleich der oder kleiner als die Bahnbreite ist, tendenziell dazu, dass die auf die Bahnoberfläche aufgebrachte Auftragsschicht in den seitlichen Randpartien dicker ist und sich infolge dessen eine gleichförmige Dicke der Auftragsschicht schwer erzielen lässt. Entsprechend gilt, dass sich, wenn die Vorhangbreite größer ist als die Bahnbreite und somit der Vorhang über die Bahnränder hinweg abströmt, eine Auftragsschicht gleichförmiger Dicke erzeugen lässt.According to the known device is at different composition of the coating colors ta, tb, the first layer ca of the color curtain wider than the web w, the other layer cb of the color curtain, which is narrower than the web w, does not flow over the web w. As a result, only a single-layer liquid film (color curtain) flows ca over the edge of the web w away, the overflowing color ta can be collected and recycled for reuse for the application of a coating layer same recipe for liquid feed. Note that during free fall, the color curtain will shrink in width due to changes in surface tension. For this reason, when a web w is wiped, when the width of the curtain is equal to or smaller than the web width, the coat layer applied to the web surface tends to be thicker in the side edge portions and, as a result, a uniform thickness of the coat layer difficult to achieve. Accordingly, if the curtain width is greater than the web width and thus the curtain drains past the web edges, then a coating layer of uniform thickness can be created.
Die mit der Rückgewinnung der Streichfarbe während des Streichens der Bahn w verbundenen Probleme in derbekannten Streichvorrichtung sind vernachlässigbar. Ein Problem stellt jedoch die Rückgewinnung der Farbe in der Vorbereitungsphase zur Einleitung des Betriebs der Vorrichtung dar. Das heißt, dass generell über einen kurzen Zeitraum vor Einleitung des Streichvorgangs bis zur erfolgten Ausbildung eines stabilen Farbvorhangs Streichfarbe an die Vorhangstreichköpfe geschickt und von diesen ausgebracht wird, während die Bahn sich in einem stationären Zustand befindet. In dieser Phase kommt es zu einer Vermischung der beiden Streichfarben, so dass keine Rückgewinnung möglich ist.The problems associated with the recovery of the coating color during coating of the web w in the known coating device are negligible. One problem, however, is the recovery of the paint in the preparation phase to initiate the operation of the apparatus. That is, over a short period of time prior to the initiation of the brushing operation until a stable color curtain is formed, paint is sent to and applied to the curtain coaters, while the web is in a steady state. In this phase comes it is a mixture of the two coating colors, so that no recovery is possible.
Es handelt sich hierbei um einen sogenannten Schlingerversatz (Snaking) der Bahn bzw. einer Karton- oder Papierbahn. Wird also eine Papierbahn, die von einer mit einem Abroller verbundenen Wickelrolle abgewickelt wird, unmittelbar nach dem Abrollen gestrichen, so ist das Schlingerproblem der Bahn im Wesentlichen vernachlässigbar. Erfolgt jedoch das Streichen einer von einer Wickelrolle abgewickelten Bahn mit einem Streichgang und nachfolgender Trocknung sowie einem weiteren zusätzlichen Streichgang mit erneuter nachfolgender Trocknung, so wird, da die gestrichene Oberfläche vor der Trocknung nicht mit einem Festkörper in Berührung gebracht werden darf, ein Lufttrockner in aufgehängtem Zustand über das Papier geführt und bläst zu dessen Trocknung Heißluft darüber, was dazu führt, dass das Papier bis zum Zeitpunkt des zweiten Strichs in der fortgesetzten Bewegung einen Seitenversatz um ganze 30 mm erfährt. Dementsprechend ist die Möglichkeit groß, dass bei Auftreten dieses Problems die Bahn auf ihrem Weg durch die Papiermaschine an den Rändern ungestrichen bleibt.This is a so-called snaking of the web or a cardboard or paper web. Thus, if a paper web which is unwound from a take-up roll connected to a dispenser is painted immediately after unwinding, the web sling problem is essentially negligible. However, if the coating of a unwound from a winding roll web with a Streichgang and subsequent drying and another additional Streichgang with renewed subsequent drying, it is because the coated surface before drying must not be brought into contact with a solid, an air dryer in suspended Condition passes over the paper and blows over it to dry hot air above it, which causes the paper by the time of the second stroke in the continued movement of a page offset by as much as 30 mm. Accordingly, there is a great possibility that when this problem occurs, the web will remain uncoated on its way through the paper machine at the edges.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Nachteile des Standes der Technik zu vermeiden.The present invention has for its object to avoid the disadvantages of the prior art.
Die Aufgabe der Erfindung wird durch ein Verfahren und eine Vorrichtung derart gelöst, dass die Vorhangstreichköpfe seitlich zur Bahn verschiebbar sind, wobei die Breite der von einem der Vorhangstreichköpfe abgegebenen Streichfarbe größer ist als die Bahnbreite, die Breite der vom anderen Vorhangstreichkopf abgegebenen Streichfarbe kleiner ist als die Bahnbreite und ein Versatz-Sensor zur Erkennung des Schlingerversatzes der Bahn vorgesehen ist. Dadurch wird die Position der beiden Vorhangstreichköpfe in seitlicher Richtung durch vom Versatz-Sensor gelieferte Signale so gesteuert, dass sie dem Schlingerversatz der Bahn entspricht.The object of the invention is achieved by a method and a device such that the curtain coating heads are laterally displaceable to the web, wherein the width of the coating discharged from one of the Vorhangstreichköpfe width is greater than the web width, the width of the dispensed from the other Vorhangstreichkopf coating color is smaller than the web width and an offset sensor for detecting the roll misalignment of the web is provided. As a result, the position of the two curtain coating heads in the lateral direction is controlled by signals supplied by the displacement sensor so that it corresponds to the rolling offset of the web.
Damit kann zwischen den Farbvorhängen und der Bahn in seitlicher Richtung eine feste relative Position aufrechterhalten werden und es ist dementsprechend nicht möglich, dass die Seitenränder des durch die Maschine geführten Bahn bzw. des Papiers ungestrichen bleiben. In Anbetracht der Tatsache, dass die getrennt vorgesehenen mehreren Vorhangstreichköpfe Farbrückgewinnungsmittel zur Aufnahme und unabhängigen Rückführung sämtlicher von den Vorhangstreichköpfen abgegebener Streichfarbe aufweisen, kann problemlos vor und nach dem Streichen die Streichfarbe zurückgewonnen und das System mit Wasser gespült werden.Thus, a fixed relative position can be maintained between the color curtains and the web in the lateral direction and, accordingly, it is not possible for the side edges of the web or web guided by the machine to be maintained Papers remain uncoated. In view of the fact that the separately provided multiple curtain coaters have color recovery means for receiving and independently recycling all the coating color dispensed by the curtain coaters, the coating color can be easily recovered before and after painting and the system rinsed with water.
Zu den vorteilhaften Auswirkungen der Streichvorrichtung und des Streichverfahrens der vorliegenden Erfindung, wie oben beschrieben, gehören beispielsweise die Ermöglichung eines problemlosen Strichs auch bei schlingerbedingtem Papierversatz und ferner die Ermöglichung problemloser Farbrückgewinnung und Systemspülung mit Wasser vor und nach dem Streichen.The beneficial effects of the coater and coating method of the present invention, as described above, include, for example, facilitating a trouble-free stroke even with skew-related paper misalignment and further enabling easy color recovery and system rinse with water before and after brushing.
Weitere vorteilhafte Ausgestaltungsmöglichkeiten ergeben sich aus den Unteransprüchen.Further advantageous embodiment possibilities emerge from the subclaims.
Nachfolgend soll die Erfindung anhand eines Ausführungsbeispieles näher beschrieben werden.The invention will be described in more detail with reference to an embodiment.
Es zeigen:
- FIG. 1
- eine Seitenansicht der Vorhand-Streichvorrichtung der vorliegenden Erfindung;
- FIG. 2
- eine Draufsicht der Streichvorrichtung der vorliegenden Erfindung;
- FIG.3
- eine Teilseitenansicht der Streichvorrichtung der vorliegenden Erfindung: (A) illustriert den Zustand der Vorrichtung während des Streichvorgangs und (B) illustriert den Zustand der Vorrichtung während der Streichvorbereitung;
- FIG. 4
- ein Hauptteil-Querschnitt der Zweischicht-Vorhangstreichmaschine nach dem Stand der Technik;
- FIG.5
- ein Querschnitt der Zweischicht-Vorhangstreichmaschine nach dem Stand der Technik;
- FIG. 1
- a side view of the forehand coater of the present invention;
- FIG. 2
- a plan view of the coating device of the present invention;
- FIG.3
- A partial side view of the coater of the present invention: (A) illustrates the state of the device during the coating operation, and (B) illustrates the state of the device during the coating preparation;
- FIG. 4
- a major part cross section of the two-layer curtain coater of the prior art;
- FIG.5
- a cross section of the two-layer curtain coater of the prior art;
Wie in den
Der Farbvorhang ca ist dabei breiter als die Bahn w und, wie in
Die Vorhangstreichköpfe 1a, 1b sind in seitlicher Richtung der Bahn w verschiebbar. Das heißt, dass die Vorhangstreichköpfe 1a, 1b ein Schiebeteil 5 aufweisen. Das Schiebeteil 5, welches eine Schiene 5a und ein in die Schiene 5a eingreifendes Anhängeteil 5b beinhaltet, wird von einem Stellglied 8 angetrieben. Das Stellglied 8 kann ein Hydraulikzylinder oder ein Servozylinder sein. Die Breite der vom Vorhangstreichkopf 1a abgegebenen Farbe ist größer als die Breite der Bahn w und die Breite der vom Vorhangstreichkopf 1b abgegebenen Farbe ist kleiner als die Breite der Bahn w. Das Symbol 6 bezeichnet einen Versatz-Sensor für die Erkennung des Schlingerversatzes der Bahn w. Der Versatz-Sensor 6 kann beispielsweise eine Vorrichtung zur Erkennung der Position einer Bahnkante mithilfe einer CCD-Kamera darstellen.The curtain coating heads 1a, 1b are displaceable in the lateral direction of the web w. That is, the curtain coating heads 1a, 1b have a sliding part 5. The sliding part 5, which includes a
Der Versatz-Sensor 6 sendet Signale an ein Steuergerät 7 und dieses sendet Steuersignale an die Stellglieder 8, 8a, 8b der Vorhangstreichköpfe 1a, 1b, um die Position der Vorhangstreichköpfe 1a, 1 b in seitlicher Richtung so zu ändern, dass sie dem Schlingerversatz der Bahn entsprechen.The offset sensor 6 sends signals to a controller 7 and sends control signals to the
In
Es folgt eine Beschreibung der Verfahrensweise dieser Ausführungsform. In Anbetracht der Tatsache, dass die Vorhangstreichköpfe 1a, 1b seitlich zur Bahn verschiebbar sind und ihre Position in seitlicher Richtung zur Bahn w über von einem Versatz-Sensor 6 kommende Signale so gesteuert wird, dass sie dem Schlingerversatz der Bahn w entspricht, kann zwischen den Farbvorhängen ca, cb und der Bahn w in seitlicher Richtung eine feste relative Position konstant aufrechterhalten werden und es ist dementsprechend nicht möglich, dass die Seitenränder der durch die Maschine geführten Bahn bzw. das Papier ungestrichen bleiben. In Anbetracht der Tatsache, dass die beiden getrennt vorgesehenen Vorhangstreichköpfe 1a, 1b Farbrückgewinnungsmittel 4a, 4b zur Aufnahme und unabhängigen Rückführung sämtlicher von den Vorhangstreichköpfen 1a, 1b abgegebener Streichfarbe aufweisen, kann problemlos vor und nach dem Streichen die Streichfarbe zurückgewonnen und das System mit Wasser gespült werden. Dadurch dass die Breite der vom Vorhangstreichkopf 1a abgegebenen Farbe größer als die Bahnbreite und die Breite der vom Vorhangstreichkopf 1 b abgegebenen Farbe kleiner als die Bahnbreite ist, wodurch deren Farbe sämtlich auf der Bahn w bleibt, kann selbst dann, wenn die beiden Vorhangstreichköpfe getrennte Farben einsetzen, die Farbe problemlos rückgewonnen werden, ohne dass zwischen dem Farbvorhang cb und den über die beiden Ränder der Bahn w hinausströmenden Abschnitten des Farbvorhangs ca eine Vermischung erfolgt.The following is a description of the procedure of this embodiment. In view of the fact that the curtain coating heads 1a, 1b are laterally of the web are displaceable and their position in the lateral direction to the web w via signals coming from an offset sensor 6 is controlled so that it corresponds to the Schlingerversatz the web w, between the color curtains ca, cb and the web w in the lateral direction a fixed relative Position are maintained constant and it is accordingly not possible that the side edges of the guided through the machine web or paper remain uncoated. In view of the fact that the two separately provided curtain coater heads 1a, 1b have color recovery means 4a, 4b for receiving and independently recycling all the coating color dispensed by the curtain coater heads 1a, 1b, the coating color can be easily recovered before and after painting and the system rinsed with water become. By making the width of the ink discharged from the curtain coating head la larger than the web width and the width of the ink discharged from the
Die vorliegende Erfindung ist nicht auf die oben beschriebene Ausführungsform beschränkt und entsprechend können innerhalb des Wesens der vorliegenden Erfindung eine Reihe von Änderungen an ihr vorgenommen werden. Beispielsweise wird zwar oben die Verwendung einer CCD-Kamera als Versatz-Sensor beschrieben, aber es können andere Messfühlerarten wie ein Sensor mit fotoelektrischer Zelle eingesetzt werden.The present invention is not limited to the embodiment described above, and accordingly, a number of changes can be made thereto within the spirit of the present invention. For example, while the use of a CCD camera as an offset sensor is described above, other types of sensors such as a photoelectric cell sensor may be used.
- 11
- Streichvorrichtungcoater
- 1 a1 a
- VorhangstreichkopfCurtain coating head
- 1 b1 b
- VorhangstreichkopfCurtain coating head
- 22
- Führungsblechguide plate
- 2a2a
- schiefe Ebeneinclined plane
- 2b2 B
- Vorhangführungcurtain guide
- 33
- Farbwannepaint tray
- 4a4a
- Farbrückgewinnungsmittel (Farbwanne)Color recovery agent (ink tray)
- 4b4b
- Farbrückgewinnungsmittel (Farbwanne)Color recovery agent (ink tray)
- 55
- Schiebeteilsliding part
- 5a5a
- Schienerail
- 5b5b
- Anhängeteilattachments part
- 66
- Schlingerversatz-SensorSnaking offset sensor
- 77
- Steuergerätcontrol unit
- 88th
- Stellgliedactuator
- 8a8a
- Stellgliedactuator
- 8b8b
- Stellgliedactuator
- caca
- Farbvorhangcolor Blind
- cbcb
- Farbvorhangcolor Blind
- ww
- Bahn (Papier)Railway (paper)
- xx
- Abstanddistance
Claims (9)
- Method for applying at least two layers of coating colour to the surface of a moving web (w), in particular a paper or board web, by using a coating apparatus (1) in which, for the application of at least two layers of coating colour, at least two curtain coating heads (1a, 1b) are provided at an arbitrary distance from each other, which in each case discharge coating colour downwards onto the web (w) and, on a guide plate (2) the respective coating colours discharged downwards one after another in the direction of an inclined plane (2a) of the guide plate (2) from the aforementioned curtain coating heads being laminated in the course of their movement over the inclined plane, forming an at least two-layer colour layer, and the aforesaid colour layers being discharged onto the surface of the moving web (w) in the form of a colour curtain (ca, cb),
characterized in that
the curtain coating heads (1a, 1b) are displaced laterally with respect to the web (w), an offset sensor (6) being used to detect a snaking offset of the web (w) and the position of the curtain coating heads (1a, 1b) in the lateral direction being controlled by means of signals supplied by the offset sensor (6) in such a way that the said position corresponds to the snaking offset of the web. - Method according to Claim 1,
characterized in that
using an actuating element (8), the curtain coating heads (1a, 1b) are displaced laterally with respect to the web (w), the actuating element (8) receiving signals from the snaking offset sensor (6) via a control device (7). - Method according to Claim 1 or 2,
characterized in that
all the coating colour discharged by the curtain coating heads (1a, 1b) can be caught and fed back. - Apparatus (1) for applying at least two layers of coating colour to the surface of a moving web (w), in particular a paper or board web, having:- at least two curtain coating heads (1a, 1b) arranged at an arbitrary distance from each other, which in each case discharge coating colour downwards onto the web (w)- a guide plate (2), on which the respective coating colours discharged downwards one after another in the direction of an inclined plane (2a) from the aforementioned at least two curtain coating heads (1a, 1b) are laminated in the course of their movement over the inclined plane (2a), forming an at least two-layer colour layer,characterized in that
the curtain coating heads (1a, 1b) can be displaced laterally with respect to the web (w), and an offset sensor (6) is provided to detect a snaking offset of the web (w) and to adjust the position of the curtain coating heads (1a, 1b) in the lateral direction in such a way that, by means of signals supplied by the offset sensor (6), the position of the curtain coating heads (1a, 1b) can be controlled such that it corresponds to the snaking offset of the web (w). - Apparatus according to Claim 4,
characterised in that
a curtain guide (2b) pointing downwards is provided at the lower end of the aforesaid inclined plane (2a) in order to lead away the laminated colour layer in the form of a colour curtain (ca, cb). - Apparatus according to Claim 4 or 5,
characterized in that
means (4a, 4b) are provided to catch and to feed back the coating colour discharged by the curtain coating heads (1a, 1b). - Apparatus according to Claims 4 to 6,
characterized in that
the curtain coating heads (1a, 1b) each have a sliding part (5) having a rail (5a) and a suspension part (5b) engaging in the rail (5a). - Apparatus according to Claim 7,
characterized in that
the sliding part (5) can be driven by an actuating element (8), the actuating element (8) receiving signals from the snaking offset sensor (6) via a control device (7). - Apparatus according to one of Claims 4 to 8,
characterized in that
the width of the coating colour discharged by the first curtain coating head (1a) is wider than the width of the web (w), and the width of the coating colour discharged by the second curtain coating head (1b) is smaller than the width of the web (w).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005318582A JP4902984B2 (en) | 2005-11-01 | 2005-11-01 | Coating apparatus and coating method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1782891A2 EP1782891A2 (en) | 2007-05-09 |
| EP1782891A3 EP1782891A3 (en) | 2008-05-07 |
| EP1782891B1 true EP1782891B1 (en) | 2009-09-16 |
Family
ID=37695983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06122981A Not-in-force EP1782891B1 (en) | 2005-11-01 | 2006-10-26 | Method of and apparatus for deposition of at least two layers of coating colour onto the surface of a moving web, in particular a paper or cardboard web |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1782891B1 (en) |
| JP (1) | JP4902984B2 (en) |
| AT (1) | ATE442913T1 (en) |
| DE (1) | DE502006004846D1 (en) |
Families Citing this family (6)
| 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 |
| DE102007000782A1 (en) | 2007-09-27 | 2009-04-02 | Voith Patent Gmbh | Device for applying two layers of curtain application medium on moving paper-, cardboard- or other fibrous web, comprises two applicator nozzles for the medium in gravitational direction, and inclined slide plate arranged below the nozzles |
| DE102007000781A1 (en) | 2007-09-27 | 2009-04-02 | Voith Patent Gmbh | Curtain applicator for applying two layers of application medium on a moving paper-, cardboard- or other fibrous-material web, comprises two parallel application nozzles for delivering the layer of application medium, and a sliding plate |
| CN102773200B (en) * | 2012-08-09 | 2014-12-17 | 深圳市浩能科技有限公司 | Extrusion die head adjusting device |
| WO2018030944A1 (en) * | 2016-08-09 | 2018-02-15 | Ikea Supply Ag | Device and method for applying paint on objects |
| CN111344457B (en) * | 2017-12-28 | 2021-03-12 | 科亚列士信荣株式会社 | Method for producing deodorizing paper |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1321474A (en) * | 1970-10-19 | 1973-06-27 | British Iron Steel Research | Method and apparatus for guiding sheet |
| DE19631888A1 (en) * | 1996-08-07 | 1998-02-12 | Voith Sulzer Papiermasch Gmbh | Applicator for direct or indirect application of a liquid or pasty coating medium to a running material web, in particular made of paper or cardboard |
| DE10057729A1 (en) * | 2000-11-22 | 2002-05-23 | Voith Paper Patent Gmbh | Web coating station, has two applicators, to deliver the coatings as falling curtains, with different coating media and a structured gap between the strike points of each at the moving substrate for the overlaid layers |
| US6706315B2 (en) * | 2001-09-17 | 2004-03-16 | Xerox Corporation | Coating process for coating die with laser position sensors |
| JP2003241405A (en) * | 2001-12-12 | 2003-08-27 | Xerox Corp | Process for coating photoconductor |
| DE20321815U1 (en) * | 2003-05-06 | 2010-07-22 | Voith Patent Gmbh | Multi-layer application device for applying application medium by way of at least one multilayer curtain or veil |
| JP2005230683A (en) * | 2004-02-19 | 2005-09-02 | Nippon Steel Corp | Manufacturing method for precoated steel sheet and coating apparatus for steel sheet |
| JP4746894B2 (en) * | 2005-03-14 | 2011-08-10 | ボイス ペ−パ− パテント ゲ−エムベ−ハ− | Coating equipment |
| JP4902160B2 (en) * | 2005-09-22 | 2012-03-21 | ボイス ペ−パ− パテント ゲ−エムベ−ハ− | Coating equipment |
-
2005
- 2005-11-01 JP JP2005318582A patent/JP4902984B2/en not_active Expired - Fee Related
-
2006
- 2006-10-26 EP EP06122981A patent/EP1782891B1/en not_active Not-in-force
- 2006-10-26 AT AT06122981T patent/ATE442913T1/en active
- 2006-10-26 DE DE502006004846T patent/DE502006004846D1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP1782891A2 (en) | 2007-05-09 |
| EP1782891A3 (en) | 2008-05-07 |
| JP2007125464A (en) | 2007-05-24 |
| JP4902984B2 (en) | 2012-03-21 |
| DE502006004846D1 (en) | 2009-10-29 |
| ATE442913T1 (en) | 2009-10-15 |
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