EP1375746A1 - Process and apparatus for applying onto one side or both sides a fluid to pasty medium - Google Patents

Process and apparatus for applying onto one side or both sides a fluid to pasty medium Download PDF

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Publication number
EP1375746A1
EP1375746A1 EP03101583A EP03101583A EP1375746A1 EP 1375746 A1 EP1375746 A1 EP 1375746A1 EP 03101583 A EP03101583 A EP 03101583A EP 03101583 A EP03101583 A EP 03101583A EP 1375746 A1 EP1375746 A1 EP 1375746A1
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EP
European Patent Office
Prior art keywords
curtain
fibrous web
web
electrostatic
electric field
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.)
Granted
Application number
EP03101583A
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German (de)
French (fr)
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EP1375746B1 (en
Inventor
Benjamin Dr. Méndez-Gallon
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication date
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Publication of EP1375746A1 publication Critical patent/EP1375746A1/en
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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
    • 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
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0283—Flat jet coaters, i.e. apparatus in which the liquid or other fluent material is projected from the outlet as a cohesive flat jet in direction of the work
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
    • 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
    • B05C9/04—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 liquid or other fluent material to opposite sides of the work

Definitions

  • the invention relates to a method and a device for one or both sides Apply a liquid to pasty medium, for example coating color a running fibrous web, especially made of paper or cardboard
  • a liquid to pasty medium for example coating color a running fibrous web, especially made of paper or cardboard
  • a curtain application which the suspension in finished dose in the form of a curtain with the effect of electrostatic forces releases to the running fibrous web.
  • the invention is based on DE10012256 A1.
  • an application device in which a device for generating an electric field is provided in the area of the curtain application unit. This electric field exerts a force on the curtain moving from the application work to the running surface in such a way that the curtain, which essentially falls due to gravity, can move in a stretched form in a stable manner from top to bottom.
  • the curtain application unit is above that to be coated, the current one Surface arranged.
  • the surface to be coated can be, for example Applicator roller or an applicator belt, the medium being indirect the fibrous web is released. When applied directly, the fibrous web forms the running surface.
  • the object of the present invention is a curtain coating method and to provide a device which overcomes the disadvantages of the prior art are avoidable.
  • the object is achieved by a method according to the Characteristic of claim 1 and a device with the characteristic of Claim 6 specified feature.
  • Electrostatics can counteract the effect of gravity on the curtain Steer the fibrous web and there also for a uniform coat application to care.
  • free jet applicators are also included operated at high pressure and work with excess. The one in excess applied stroke is then to the required dimension (stroke weight) and doctored to achieve a uniform line thickness.
  • the web is coated on both sides or one simultaneous simultaneous curtain coating of both sides of the web possible.
  • The can be horizontal or approximately horizontal, as well as vertical or approximate vertically running path.
  • Another advantage of the invention is that the same type of order work, ie. So curtain applicators can be used for both sides of the web.
  • An advantage of the arrangement below the web is that none collecting trays spanning the web width, including their drives for the Swinging away, must be installed between the curtain nozzle and the web because all the things that occur during the coating process or when starting up or Execution of the coating process occurs (e.g. spraying of the application medium, Medium discharge when starting up or shutting down, condensation, Cleaning liquid) due to the arrangement below the track not on this can reach.
  • Another advantage is that it is easier to vent the curtain nozzle. As a result of the outlet nozzle now directed from the bottom upwards, the air can escape upwards.
  • the electrostatic field is in the range (Environment) of the nozzle of the curtain applicator.
  • the electrostatic charging of the fibrous web is also provided.
  • the electrostatic field has an output from approx. 0.025 to 1.0 kW / m, a current of approx. 0.01 to 10 mA and one Voltage of about 5 to 60 kV is operated.
  • the polarity of the electrodes is preferably chosen to be positive, because of this stronger effects are achievable. But also with negative polarity effect according to the invention achievable.
  • the fibrous web should have a moisture content of approximately 1% to 4.5% exhibit.
  • the curtain applicator can have a continuous slot nozzle, that is to say that extends across the width of the fibrous web, from which the closed curtain emerges.
  • a large number of application spray nozzles it is also possible for a large number of application spray nozzles to be arranged distributed over the width of the web and for the spray jets to be combined to form a closed curtain.
  • suspensions in particular aqueous pigment suspensions and emulsions are understood, their viscosities can fluctuate.
  • FIG. 1 shows a paper or cardboard web 1 which, coming from below, is guided over a deflection roller 2 and from there continues at an acute angle to an imaginary horizontal H to a treatment location where coating color is to be applied to the web 1.
  • coating color it is also conceivable to glue or impregnate the web.
  • both sides of the web are to be coated one curtain applicator 3 each for the web side 1a and one conventional Acting curtain applicator 4 available for the web side 1b.
  • the web is passed through a contactless web redirector Drying device 5 directed from where it is not another in the Figures treatment step shown can be supplied.
  • Said application unit 4 is a conventional curtain unit, which is the order medium, i.e. the curtain 4a essentially releases under the influence of gravity from above onto the paper web side 1b.
  • the curtain applicator 3 is arranged to coat the web side 1a. In principle, it is constructed like the application unit 4.
  • the field generating device 6 is located above the web side 1b in the area of the deflecting roller 2.
  • the field generating device 7 is also located above the web side 1b, but here in the area of the line of incidence of the curtain 3a, which originates from the application unit 3.
  • Both field generating devices 6 and 7 consist of an electrode arrangement, which in turn consist of a large number of individual electrodes (electrode tips) exists, which is arranged evenly distributed over the entire width of the web are.
  • the electric field F generated by the device 7 extends over the entire area or the vicinity of the application unit 3 in a zone above the web side 1b to the web side 1a, where the upward curtain 3a emerges from the application unit 3.
  • the length of the curtain or the distance between the curtain nozzle and web 1 can be 5 mm to 50 mm.
  • FIG. 2 shows one-sided application by means of an application unit 3 arranged below the web 1 with a so-called Paint distribution tube 3b and a metering gap 3c shown, the curtain again reaches the paper web against gravity.
  • the dashed circle shows the extent of the electric field F.
  • FIG. 3 provides an enlarged section of the image.
  • the horizontal lines within the web 1 show its electrostatic Charging by means of the generating device 6.
  • the vertical lines give the Size and spread of the electrostatic field F with which it it is possible to feed said curtain 3a from below to web side 1a, to immobilize there as layer 3aS.
  • FIG. 4 shows an arrangement for simultaneous, that is to say simultaneous, coating.
  • the web 1 runs from bottom to top via the deflection roller 2 provided with earth potential.
  • a curtain applicator 3 arranged at the same height and essentially horizontally.
  • the medium curtain 3a is replaced by the electrostatic Forces drawn to the train.
  • An electrode arrangement 6 also serves to charge the web 1 and each Electrode arrangements 7 arranged on both sides of the web 1 produce up to Opposite or beyond electrostatic fields.
  • a collecting trough 8 is also shown in FIG. 4, as in FIG.
  • This Catch pan is in and out of curtain 3a pivotable so that the application medium, i.e. the coating color used here Start of the actual coating process on the running web 1 and after Completion of this process and / or the side edges of the curtain 3a Desired stroke-free edge can be caught on the web 1.
  • the application medium i.e. the coating color used here Start of the actual coating process on the running web 1 and after Completion of this process and / or the side edges of the curtain 3a Desired stroke-free edge
  • devices 10 for air boundary layer removal or Suction or counter air bubbles or the like in The direction of travel of the web must be arranged before the curtain applicator can.
  • the electrostatic forces should start from the start of the starting process, at the latest but from the beginning of the current coating process to the end of the Coating work.
  • curtain works on each side of the web for one Multiple orders can be arranged.

Abstract

An electrostatic curtain discharge process applies a coat liquid or paste medium to one or both sides of a moving web of paper or carton. In the process, an electrostatic force especiallyecially. deflects the curtain (3a) towards the web (1) and away from the path it would otherwise take under the influence of the earth's gravity. Also claimed is a commensurate assembly in which an electrostatic charge is applied to the web which is subjected to an electrostatic field. The field electrostatic potential is in the range 5 to 60 kW, at a current of 0.01 to 10 mA. The web humidity is in the range 1 to 4.5 per cent. The field drives the curtain upwards (3a) against the web lower face.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum ein- oder beidseitigen Auftra-gen eines flüssigen bis pastösen Mediums, beispielsweise Streichfarbe, auf eine laufende Faserstoffbahn, insbesondere aus Papier oder Karton unter Verwendung eines Vorhang-Auftragswerkes, welches die Suspension in fertigdosierter Menge in Form eines Vorhanges mit Wirkung elektrostatischer Kräfte an die laufende Faserstoffbahn abgibt.The invention relates to a method and a device for one or both sides Apply a liquid to pasty medium, for example coating color a running fibrous web, especially made of paper or cardboard Use of a curtain application, which the suspension in finished dose in the form of a curtain with the effect of electrostatic forces releases to the running fibrous web.

Ziel eines solchen Vorhang-Auftragswerkes ist es, auf die Faserstoffbahn genau die Menge an Auftragsmedium aufzubringen, die auf dieser auch verbleiben soll (1:1-Auftrag).The goal of such a curtain application is to produce exactly that on the fibrous web Apply the amount of application medium that should remain on it (1: 1 order).

Dies steht im Gegensatz zu anderen verbreiteten Anordnungen und Verfahren, mit denen das Medium im Überschuss abgegeben wird. Dieser Überschuss muss im weiteren Verlauf des Verfahrens wieder von der Faserstoffbahn abgestreift (abgerakelt) werden, weshalb man unter anderem große Mengen an Auftragsmedium und Pumpenenergie benötigt.This is in contrast to other common arrangements and procedures with to which the medium is given in excess. This excess must be in the stripped further course of the process again from the fibrous web (scraped off), which is why, among other things, large amounts of application medium and pump energy needed.

Die Erfindung geht aus von der DE10012256 A1.
In dieser Druckschrift ist eine Auftragsvorrichtung offenbart, bei der im Bereich des Vorhang-Auftragswerkes eine Vorrichtung zum Erzeugen eines elektrischen Feldes vorgesehen ist.
Dieses elektrische Feld übt auf den sich vom Auftragswerk zur laufenden Oberfläche bewegenden Vorhang eine dessen Bewegung unterstützende Kraft dergestalt aus, dass der im wesentlichen schwerkraftbedingt fallende Vorhang in gestreckter Form sich von oben nach unten stabil bewegen kann. The invention is based on DE10012256 A1.
In this document, an application device is disclosed in which a device for generating an electric field is provided in the area of the curtain application unit.
This electric field exerts a force on the curtain moving from the application work to the running surface in such a way that the curtain, which essentially falls due to gravity, can move in a stretched form in a stable manner from top to bottom.

Das Vorhang-Auftragswerk ist dazu oberhalb der zur beschichtenden, laufenden Oberfläche angeordnet. Die zu beschichtende Oberfläche kann beispielsweise ein Auftragswalze oder ein Auftragsband sein, wobei in indirekter Weise das Medium an die Faserstoffbahn abgegeben wird. Bei direktem Auftrag bildet die Faserstoffbahn die laufende Oberfläche.The curtain application unit is above that to be coated, the current one Surface arranged. The surface to be coated can be, for example Applicator roller or an applicator belt, the medium being indirect the fibrous web is released. When applied directly, the fibrous web forms the running surface.

Derartige Anordnungen zur Beschichtung einer Bahnseite mit von oben nach unten fallendem Vorhang sind bereits bekannt und werden in der Fachwelt als "Curtain Coating" bezeichnet.Such arrangements for coating a web side with from top to bottom falling curtain are already known and are called "curtain Coating ".

Sie werden vor allem genutzt bei bekannten Extrusionsverfahren, Verfahren zur Beschichtung von fotografischen Filmen, Tonbändern oder zur Beschichtung von Spezialpapieren mit Mikrokapseln. In diesem Zusammenhang wird beispielsweise auf die DE19716466 A1 verwiesen.They are mainly used in known extrusion processes, processes for Coating of photographic films, tapes or for coating Special papers with microcapsules. In this context, for example referred to DE19716466 A1.

Bei der gewünschten Beschichtung von nur einer Bahnseite, beispielsweise der Oberseite der Bahn, mittels Vorhang, wendet man die vorstehend genannte Ausführung mit von oben nach unten herabfallendem Vorhang an.With the desired coating from only one side of the web, for example the The top of the web, using a curtain, is used to apply the above Version with curtain falling from top to bottom.

Soll aber noch die zweite Seite oder auch nur die zweite bzw. untere Bahnseite mittels Vorhang beschichtet werden, müssen andere Arten an Beschichtungsverfahren und Auftragwerken eingesetzt werden oder es ist eine sehr aufwändige Bahnführung mit langen Bahnwegen und einer Vielzahl an Bahnführungselementen und Ausrüstungsteilen notwendig, damit die jeweilige Bahnseite wiederum mit einem Vorhang von oben her beschichtet werden kann.But should still the second side or only the second or lower side of the web other types have to be coated with a curtain Coating processes and application systems are used or it is a very elaborate web guidance with long train paths and a multitude of Web guiding elements and equipment parts necessary so that the respective Web side can in turn be coated with a curtain from above.

Aufgabe der vorliegenden Erfindung ist es, ein Vorhangbeschichtungs - Verfahren und eine Vorrichtung zu schaffen, mit dem die Nachteile des Standes der Technik vermeidbar sind. The object of the present invention is a curtain coating method and to provide a device which overcomes the disadvantages of the prior art are avoidable.

Die Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren gemäß dem Kennzeichen des Anspruches 1 und einer Vorrichtung mit dem im Kennzeichen des Anspruches 6 angegebenen Merkmal.The object is achieved by a method according to the Characteristic of claim 1 and a device with the characteristic of Claim 6 specified feature.

Als völlig überraschend und unerwartet hat sich herausgestellt, dass die angelegte Elektrostatik es vermag, den Vorhang entgegen der Wirkung der Schwerkraft an die Faserstoffbahn zu lenken und dort auch für einen gleichmäßigen Strichauftrag zu sorgen.It turned out to be completely surprising and unexpected that the created Electrostatics can counteract the effect of gravity on the curtain Steer the fibrous web and there also for a uniform coat application to care.

Das ist um so bedeutender, da immer öfter breite Faserstoffbahnen, insbesondere Papier- und Kartonbahnen von 10m breite und mehr, gleichmäßig und bei hohen Bahngeschwindigkeiten um ca.2000m/min zu beschichten sind. Dabei ist auch bedeutsam, dass ein Vorhangs-Auftragswerk ja nahezu drucklos bzw. mit nur geringstem Mediendruck und ohne Überschussauftrag arbeitet und die Qualität des aufgetragenen Striches hoch sein muss.This is all the more important since broad fibrous webs, in particular, are becoming increasingly common Paper and cardboard webs of 10m width and more, even and at high Web speeds around 2000m / min are to be coated. It is also meaning that a curtain commissioned work is almost without pressure or with only lowest media pressure and without a surplus order and the quality of the applied stroke must be high.

Im Gegensatz zu den Vorhang-Auftragswerken werden Freistrahlauftragsdüsen mit hohem Druck betrieben und arbeiten mit Überschuss. Der im Überschuss aufgetragene Strich wird anschließend auf das geforderte Maß (Strichgewicht) und zur Erreichen einer gleichmäßigen Strichdicke abgerakelt.In contrast to the curtain applicators, free jet applicators are also included operated at high pressure and work with excess. The one in excess applied stroke is then to the required dimension (stroke weight) and doctored to achieve a uniform line thickness.

Neben der wesentlich einfacheren Bahnführung (kürzere Bahnwege) ist auch die Einsparung von Bahnführungselementen als Vorteil der Erfindung anzusehen.In addition to the much simpler path guidance (shorter pathways) is also the Saving web guide elements to be considered an advantage of the invention.

Erstmalig ist mit der Erfindung ein beidseitiges Beschichten der Bahn bzw. auch ein gleichzeitiges simultanes Vorhang-Beschichten beider Seiten der Bahn möglich. Das kann bei horizontaler oder annähernd horizontaler, als auch vertikal oder annähernd vertikal laufender Bahn erfolgen.It is the first time with the invention that the web is coated on both sides or one simultaneous simultaneous curtain coating of both sides of the web possible. The can be horizontal or approximately horizontal, as well as vertical or approximate vertically running path.

Ein weiterer Vorteil der Erfindung besteht darin, dass derselbe Typ Auftragswerk, dh. also jeweils Vorhangauftragswerke für beide Bahnseiten verwendet werden können. Another advantage of the invention is that the same type of order work, ie. So curtain applicators can be used for both sides of the web.

Der besondere Vorteil der Erfindung besteht aber darin, dass auf Grund der nun möglichen Anordnung des Vorhang-Auftragswerkes unterhalb der Papierbahn mehr Flexibilität in den Streichmaschinen einschließlich Bedienerfreundlichkeit erreicht wird.The particular advantage of the invention is, however, that due to the now possible arrangement of the curtain application work below the paper web more Flexibility in coating machines including user friendliness achieved becomes.

Ein Vorteil der genannten Anordnung unterhalb der Bahn besteht darin, dass keine die Bahnbreite überspannende Auffangwannen ,einschließlich ihrer Antriebe für das Abschwenken, zwischen Vorhangdüse und der Bahn installiert werden müssen, weil all die Dinge, die während des Beschichtungsprozesses bzw. beim Anfahren oder Abfahren des Streichprozesses entstehen (z.B. Abspritzungen des Auftragsmediums, Ablauf des Mediums beim Anfahren oder Abfahren, Kondenswasser, Reinigungsflüssigkeit) aufgrund der Anordnung unterhalb der Bahn nicht auf diese gelangen können.An advantage of the arrangement below the web is that none collecting trays spanning the web width, including their drives for the Swinging away, must be installed between the curtain nozzle and the web because all the things that occur during the coating process or when starting up or Execution of the coating process occurs (e.g. spraying of the application medium, Medium discharge when starting up or shutting down, condensation, Cleaning liquid) due to the arrangement below the track not on this can reach.

Ein weiterer Vorteil ist darin zu sehen, dass die Entlüftung der Vorhangdüse einfacher ist.
Infolge der nun von unten nach oben gerichteten Austrittsdüse kann die Luft nach oben hin austreten.Another advantage is that it is easier to vent the curtain nozzle.
As a result of the outlet nozzle now directed from the bottom upwards, the air can escape upwards.

Auch ein einfacheres nachträgliches Einbauen oder ein einfacheres Umrüsten innerhalb einer Maschine zur Herstellung der Faserstoffbahn ist somit möglich.Also easier retrofitting or easier retrofitting is therefore possible within a machine for producing the fibrous web.

Besonders vorteilhaft hat sich erwiesen, wenn das elektrostatische Feld im Bereich (Umgebung) der Düse des Vorhang-Auftragswerkes angelegt wird. Zusätzlich oder alternierend ist auch die elektrostatische Aufladung der Faserstoffbahn vorgesehen.It has proven particularly advantageous if the electrostatic field is in the range (Environment) of the nozzle of the curtain applicator. In addition or alternately, the electrostatic charging of the fibrous web is also provided.

Erfindungsgemäß ist vorgesehen, dass das elektrostatische Feld mit einer Leistung von ca. 0,025 bis 1,0 kW/m, einer Stromstärke von ca. 0,01 bis 10 mA und einer Spannung von ca. 5 bis 60 kV betrieben wird. According to the invention, it is provided that the electrostatic field has an output from approx. 0.025 to 1.0 kW / m, a current of approx. 0.01 to 10 mA and one Voltage of about 5 to 60 kV is operated.

Die Polarität der Elektroden ist dabei vorzugsweise positiv gewählt, weil dadurch stärkere Effekte erreichbar sind. Aber auch mit negativer Polarität ist der erfindungsgemäße Effekt erreichbar.The polarity of the electrodes is preferably chosen to be positive, because of this stronger effects are achievable. But also with negative polarity effect according to the invention achievable.

Die Faserstoffbahn sollte einen Feuchtigkeitsgehalt von ungefähr 1% bis 4,5% aufweisen.The fibrous web should have a moisture content of approximately 1% to 4.5% exhibit.

Weitere zweckmäßige Ausgestaltungsmerkmale der Erfindung ergeben sich aus den Unteransprüchen.Further expedient design features of the invention result from the Dependent claims.

Nachzutragen ist, dass das Vorhang-Auftragswerk eine durchgängige, also über die Breite der Faserstoffbahn reichende Schlitzdüse aufweisen kann, aus der der geschlossene Vorhang austritt.
Im Rahmen der Erfindung ist es aber auch möglich, dass eine Vielzahl von Auftragssprühdüsen verteilt über die Breite der Bahn angeordnet sind und wobei die ausgestoßenen Sprühstrahlen sich zu einem geschlossenen Vorhang vereinen.It must be added that the curtain applicator can have a continuous slot nozzle, that is to say that extends across the width of the fibrous web, from which the closed curtain emerges.
In the context of the invention, however, it is also possible for a large number of application spray nozzles to be arranged distributed over the width of the web and for the spray jets to be combined to form a closed curtain.

Außerdem ist nachzutragen, dass unter dem Auftragsmedium Suspensionen, insbesondere wässrige Pigmentsuspensionen und Emulsionen verstanden werden, wobei deren Viskositäten schwanken können.It must also be added that suspensions, in particular aqueous pigment suspensions and emulsions are understood, their viscosities can fluctuate.

Nachfolgend soll die Erfindung anhand von Ausführungsbeispielen näher erläutert werden. Es zeigen:

  • Figur 1: eine schematische Seitenansicht einer ersten Ausführungsvariante des Verfahrens bzw. der Vorrichtung für das beidseitige direkte Auftragen einer Suspension auf eine Faserstoffbahn.
  • Figur 2: eine schematische Seitenansicht einer zweiten Ausführungsvariante für ein einseitiges Auftragen.
  • Figur 3: eine vergrösserte Ansicht des Auftragsbereiches aus Figur 2.
  • Figur 4: eine schematische Seitenansicht einer dritten Ausführungsvariante für das beidseitige direkte und simultane Auftragen.
    • The invention will be explained in more detail below on the basis of exemplary embodiments. Show it:
  • Figure 1: a schematic side view of a first embodiment of the method or the device for the direct application of a suspension on both sides to a fibrous web.
  • Figure 2 is a schematic side view of a second embodiment for a one-sided application.
  • FIG. 3: an enlarged view of the application area from FIG. 2.
  • FIG. 4: a schematic side view of a third embodiment variant for direct and simultaneous application on both sides.

    • In den Figuren sind gleiche Bauteile mit gleiche Bezugszeichen versehen.In the figures, the same components are provided with the same reference symbols.

    Die Figur 1 zeigt eine Papier- bzw. Kartonbahn 1, die von unten kommend über eine Umlenkwalze 2 geführt wird und von da aus im spitzen Winkel zu einer gedachten Horizontale H weiterläuft zu einem Behandlungsort, wo Streichfarbe, auf die Bahn 1 aufgebracht werden soll.
    Anstelle von Streichfarbe ist auch das Leimen oder Imprägnieren der Bahn denkbar.    FIG. 1 shows a paper or cardboard web 1 which, coming from below, is guided over a deflection roller 2 and from there continues at an acute angle to an imaginary horizontal H to a treatment location where coating color is to be applied to the web 1.
    Instead of coating color, it is also conceivable to glue or impregnate the web.

    Wie aus der Figur 1 zu entnehmen ist, sind zur Beschichtung beider Bahnseiten jeweils ein Vorhangs-Auftragswerk 3 für die Bahnseite 1a sowie ein herkömmlich wirkendes Vorhang- Auftragswerk 4 für die Bahnseite 1b vorhanden.As can be seen from FIG. 1, both sides of the web are to be coated one curtain applicator 3 each for the web side 1a and one conventional Acting curtain applicator 4 available for the web side 1b.

    Dieser Behandlung folgend, wird die Bahn über eine kontaktlose Bahnumlenkungsund Trocknungseinrichtung 5 gelenkt, von wo aus sie einem weiteren nicht in den Figuren dargestellten Behandlungsschritt zugeführt werden kann.Following this treatment, the web is passed through a contactless web redirector Drying device 5 directed from where it is not another in the Figures treatment step shown can be supplied.

    Das besagte Auftragswerk 4 ist, wie gesagt, ein herkömmliches Vorhang-Auftragswerk, welches das Auftragsmedium, d.h. den Vorhang 4a im wesentlichen unter Einfluss der Schwerkraft von oben herab auf die Papierbahnseite 1b abgibt.Said application unit 4, as said, is a conventional curtain unit, which is the order medium, i.e. the curtain 4a essentially releases under the influence of gravity from above onto the paper web side 1b.

    In stromaufwärtiger Richtung ist das Vorhang-Auftragswerk 3 zur Beschichtung der Bahn-seite 1a angeordnet.
    Es ist prinzipiell aufgebaut wie das Auftragswerk 4. Dieses unterhalb der Bahn 1 angeordnete Auftragswerk 3 gibt, von unten nach oben, völlig ungewöhnlich , einen gegen die Wirkung der Schwerkraft gerichteten Vorhang ab. Diese Wirkung wird verstärkt, wenn zum einen die Bahn im Beispiel selbst mittels Erzeugungseinrichtung 6 bereits statisch aufgeladen ist und zum anderen (oder alternierend dazu) eine zusätzliche Felderzeugungsvorrichtung 7 vorhanden ist.
    Die Felderzeugungsvorrichtung 6 befindet sich oberhalb der Bahnseite 1b im Bereich der Umlenkwalze 2 .Die Felderzeugungsvorrichtung 7 befindet sich ebenfalls oberhalb der Bahnseite 1b, aber hier im Bereich der Auftrefflinie des Vorhanges 3a, welcher vom Auftragswerk 3 ausgeht.    In the upstream direction, the curtain applicator 3 is arranged to coat the web side 1a.
    In principle, it is constructed like the application unit 4. This application unit 3, which is arranged below the web 1, emits, from bottom to top, completely unusual, a curtain directed against the effect of gravity. This effect is enhanced if, on the one hand, the web in the example itself is already statically charged by means of generating device 6, and on the other hand (or alternately) an additional field generating device 7 is present.
    The field generating device 6 is located above the web side 1b in the area of the deflecting roller 2. The field generating device 7 is also located above the web side 1b, but here in the area of the line of incidence of the curtain 3a, which originates from the application unit 3.

    Beide Felderzeugungsvorrichtungen 6 und 7 bestehen aus einer Elektroden-Anordnung, die wiederum aus einer Vielzahl von Einzelelektroden (Elektodenspitzen) besteht, welche über die gesamte Breite der Bahn gleichmäßig verteilt angeordnet sind.Both field generating devices 6 and 7 consist of an electrode arrangement, which in turn consist of a large number of individual electrodes (electrode tips) exists, which is arranged evenly distributed over the entire width of the web are.

    Das mit der Vorrichtung 7 erzeugte elektrische Feld F erstreckt sich über den gesamten Bereich bzw. die Umgebung des Auftragswerkes 3 in einer Zone oberhalb der Bahnseite 1b bis hin zur Bahnseite 1a, wo der nach oben gerichtete Vorhang 3a aus dem Auftragswerk 3 austritt.
    Die Länge des Vorhanges bzw. der Abstand zwischen Vorhangdüse und Bahn 1 kann 5mm bis 50 mm betragen.    The electric field F generated by the device 7 extends over the entire area or the vicinity of the application unit 3 in a zone above the web side 1b to the web side 1a, where the upward curtain 3a emerges from the application unit 3.
    The length of the curtain or the distance between the curtain nozzle and web 1 can be 5 mm to 50 mm.

    In der Figur 2 ist im Gegensatz zur Variante gemäß Figur 1 das einseitige Auftragen mittels einem unterhalb der Bahn 1 angeordneten Auftragswerk 3 mit sogenanntem Farbverteilrohr 3b und einem Dosierspalt 3c dargestellt, wobei der Vorhang wiederum gegen die Schwerkraft auf die Papierbahn gelangt.In contrast to the variant according to FIG. 1, FIG. 2 shows one-sided application by means of an application unit 3 arranged below the web 1 with a so-called Paint distribution tube 3b and a metering gap 3c shown, the curtain again reaches the paper web against gravity.

    Aus der Figur 2 ist zu entnehmen, dass auch eine zur Bahn 1 schräg gestellte Anordnung des Vorhang-Auftragswerkes 3 möglich ist.It can be seen from FIG. 2 that also one inclined to the path 1 Arrangement of the curtain application unit 3 is possible.

    Das Ausmaß des elektrischen Feldes F zeigt der gestrichelte Kreis.The dashed circle shows the extent of the electric field F.

    Einen vergrößerten Bildausschnitt davon liefert die Figur 3. FIG. 3 provides an enlarged section of the image.

    Die waagrechten Striche innerhalb der Bahn 1 zeigen deren elektrostatische Aufladung mittels der Erzeugungsvorrichtung 6. Die senkrechten Striche geben die Größe und die Ausbreitung des elektrostatischen Feldes F an, mit welchem es möglich ist, den besagten Vorhang 3a von unten her der Bahnseite 1a zuzuführen, um sich dort als Schicht 3aS zu immobilisieren.The horizontal lines within the web 1 show its electrostatic Charging by means of the generating device 6. The vertical lines give the Size and spread of the electrostatic field F with which it it is possible to feed said curtain 3a from below to web side 1a, to immobilize there as layer 3aS.

    Ohne die Wirkung des elektrischen Feldes würde, wie mit strichpunktierter Linie dargestellt, der Vorhang 3a dem Gesetz der Schwerkraft folgend nach unten ablaufen. Dies ist mit 3aA bezeichnet.Without the effect of the electric field, as with a dash-dotted line shown, the curtain 3a down following the law of gravity expire. This is designated 3aA.

    Schließlich zeigt die Figur 4 eine Anordnung zur simultanen, also gleichzeitigen Beschichtung.
    Über die mit Erdpotential versehene Umlenkwalze 2 läuft bei dieser Anordnung die Bahn 1 von unten nach oben. Beidseitig der Bahn 1 ist jeweils ein in gleicher Höhe und im Wesentlichen horizontal angeordnetes Vorhang-Auftragswerk 3 vorgesehen.    Finally, FIG. 4 shows an arrangement for simultaneous, that is to say simultaneous, coating.
    In this arrangement, the web 1 runs from bottom to top via the deflection roller 2 provided with earth potential. On both sides of the web 1 there is a curtain applicator 3 arranged at the same height and essentially horizontally.

    Auch bei dieser Variante wird der Mediumsvorhang 3a durch die elektrostatischen Kräfte zur Bahn hingezogen.In this variant, the medium curtain 3a is replaced by the electrostatic Forces drawn to the train.

    Eine Elektroden-Anordnung 6 dient auch hier der Aufladung der Bahn 1 und jeweils beidseitig der Bahn 1 angeordnete Elektroden-Anordnungen 7 erzeugen bis zur Gegenseite hin bzw. darüberhinaus elektrostatische Felder.An electrode arrangement 6 also serves to charge the web 1 and each Electrode arrangements 7 arranged on both sides of the web 1 produce up to Opposite or beyond electrostatic fields.

    In der Figur 4 ist ebenfalls wie in Figur 2 eine Auffangwanne 8 dargestellt. Diese Auffang-wanne ist in den Vorhang 3a hinein und aus diesem wieder heraus schwenkbar, so dass das Auftragsmedium, d.h. die hier verwendete Streichfarbe vor Beginn des eigentlichen Beschichtungsvorganges auf die laufende Bahn 1 und nach Beendigung dieses Vorganges und/oder die Seitenränder des Vorhanges 3a bei gewünschtem strichfreien Rand auf der Bahn 1 aufgefangen werden kann.A collecting trough 8 is also shown in FIG. 4, as in FIG. This Catch pan is in and out of curtain 3a pivotable so that the application medium, i.e. the coating color used here Start of the actual coating process on the running web 1 and after Completion of this process and / or the side edges of the curtain 3a Desired stroke-free edge can be caught on the web 1.

    Bei der Anordnung des Vorhang-Auftragswerkes unterhalb der Bahn 1 gemäß Figur 1,2 und 3, wird in der Regel nur eine kurze Wanne 8 für die Seitenränder benötigt. Die andere bahnbreite Wanne kann dann entfallen, weil Abspritzungen oder Bahnfetzen bei Bahnabrissen im wesentlichen nach unten fallen und nicht die über dem Auftragswerk fortlaufende, frisch gestrichene Bahnoberfläche schädigen können.When arranging the curtain application unit below the web 1 according to the figure 1,2 and 3, usually only a short tub 8 is required for the side edges. The other web-wide tub can then be omitted because of spraying or Scraps of web in the case of web breaks essentially fall down and not those above can damage the continuous, freshly painted web surface.

    Es ist vorteilhaft, wenn die Felderzeugungseinrichtung 7 an der Auffangwanne 8 befestigt und mit dieser gemeinsam verfahrbar ist, wie die Doppelpfeile und die punktierten Linien in der Figur 4 zeigen.It is advantageous if the field generating device 7 on the collecting trough 8 attached and can be moved together with it, like the double arrows and the Show dotted lines in Figure 4.

    Nachzutragen ist, dass Vorrichtungen 10 zur Luftgrenzschicht-Entfernung bzw. zur Absau-gung oder Gegenluftblasen oder dergleichen (siehe Figur 1 und 3) in Laufrichtung der Bahn noch vor dem Vorhangs-Auftragswerk angeordnet sein können.It is to be added that devices 10 for air boundary layer removal or Suction or counter air bubbles or the like (see Figures 1 and 3) in The direction of travel of the web must be arranged before the curtain applicator can.

    Die elektrostatischen Kräfte sollten von Beginn des Anfahrvorganges an, spätestens aber von Beginn des laufenden Beschichtungsprozesses an, bis hin zum Ende der Beschichtung wirken.The electrostatic forces should start from the start of the starting process, at the latest but from the beginning of the current coating process to the end of the Coating work.

    Es ist weiterhin nachzutragen, dass auch mehrere, aber nicht in den Figuren dargestellte Vorhangs-Auftragswerke pro Bahnseite hintereinander für einen Mehrfachauftrag angeordnet sein können.It should also be added that several, but not in the figures illustrated curtain works on each side of the web for one Multiple orders can be arranged.

    Claims (13)

    Verfahren zum ein- oder beidseitigen Auftragen eines flüssigen bis pastösen Mediums, beispielsweise Streichfarbe, auf eine laufende Faserstoffbahn, insbesondere aus Papier oder Karton unter Verwendung eines Vorhang-Auftragswerkes, welches das Medium in fertigdosierter Menge, in Form eines Vorhanges mit Wirkung von elektrostatischen Kräften an die laufende Faserstoffbahn abgibt,
    dadurch gekennzeichnet, dass
    ein derartiges elektrostatisches Potential erzeugt wird, welches den Vorhang (3a) gegen die Wirkung der Schwerkraft zur laufenden Faserstoffbahn (1) lenkt.    Process for applying a liquid to pasty medium, for example coating slip, on one or both sides to a running fibrous web, in particular made of paper or cardboard, using a curtain applicator which applies the medium in a metered amount in the form of a curtain with the effect of electrostatic forces releases the running fibrous web,
    characterized in that
    such an electrostatic potential is generated which directs the curtain (3a) against the action of gravity to the running fibrous web (1).         Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die Faserstoffbahn (1) elektrostatisch aufgeladen wird.    Method according to claim 1,
    characterized in that
    the fibrous web (1) is charged electrostatically.         Verfahren nach Anspruch 1 und 2,
    dadurch gekennzeichnet, dass
    ein elektrostatisches Feld (F) im Bereich des Vorhang-Auftragswerkes (3) erzeugt wird.    Method according to claims 1 and 2,
    characterized in that
    an electrostatic field (F) is generated in the area of the curtain application unit (3).         Verfahren nach Anspruch 1 bis Anspruch 4,
    dadurch gekennzeichnet, dass
    das elektrostatische Potenzial des elektrischen Feldes (F) einen Wert von ca.5 bis 60 kW und eine Stromstärke von 0,01 bis 10 mA aufweist.    Method according to claim 1 to claim 4,
    characterized in that
    the electrostatic potential of the electric field (F) has a value of approx. 5 to 60 kW and a current of 0.01 to 10 mA.         Verfahren nach Anspruch 1 bis Anspruch 5,
    dadurch gekennzeichnet, dass
    der Feuchtigkeitsgehalt der Faserstoffbahn(1 ) ca. 1% bis 4,5 % beträgt.    Method according to claim 1 to claim 5,
    characterized in that
    the moisture content of the fibrous web (1) is approximately 1% to 4.5%.         Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, umfassend ein Vorhang-Auftragswerk (3), welches den Mediums-Vorhang (3a) frei und ungestützt an die Faserstoffbahn (1) abgibt und eine Einrichtung (7) zum Erzeugen eines elektrischen Feldes (F), welches auf den sich vom Auftragswerk (3) zur Faserstoffbahn (1) bewegenden Vorhang (3a) eine dessen Bewegung unterstützende Kraft ausübt, dadurch gekennzeichnet, dass
    das erzeugte elektrische Feld (F) in der Lage ist, den Vorhang (3a) gegen die Wirkung der Schwerkraft an die Faserstoffbahn (1) zu lenken.    Device for performing the method according to claim 1, comprising a curtain application unit (3) which releases the medium curtain (3a) freely and unsupported to the fibrous web (1) and a device (7) for generating an electric field (F) which exerts a force on the curtain (3a) moving from the application unit (3) to the fibrous web (1), which supports its movement, characterized in that
    the generated electric field (F) is able to direct the curtain (3a) against the action of gravity to the fibrous web (1).         Vorrichtung nach Anspruch 4,
    dadurch gekennzeichnet, dass
    wenigstens eine Felderzeugungsvorrichtung (6,7) in Form einer über die Breite der Faserstoffbahn (1) angeordneten Elektroden-Anordnung, bestehend aus einer Vielzahl Einzelelektroden vorhanden ist, mit welcher sowohl die Faserstoffbahn (1) aufladbar ist, als auch das elektrische Feld (F) im Bereich des Auftragswerkes (3, 4) erzeugbar ist.    Device according to claim 4,
    characterized in that
    at least one field generating device (6, 7) in the form of an electrode arrangement arranged over the width of the fibrous web (1), consisting of a large number of individual electrodes, with which both the fibrous web (1) can be charged and the electric field (F ) can be generated in the area of the commissioned work (3, 4).         Vorrichtung nach Anspruch 6 und 7,
    dadurch gekennzeichnet, dass
    das Vorhang-Auftragswerk (3) unterhalb einer im wesentlichen horizontal geführten Faserstoffbahn (1) angeordnet ist mit einer von unten nach oben laufenden Bewegungsrichtung des Vorhangs (3a).    Device according to claims 6 and 7,
    characterized in that
    the curtain applicator (3) is arranged below an essentially horizontally guided fibrous web (1) with a direction of movement of the curtain (3a) running from bottom to top.         Vorrichtung nach Anspruch 6 bis 9,
    dadurch gekennzeichnet, dass
    ein Vorhangs-Auftragswerk (4) oberhalb einer im wesentlichen horizontal geführten Faserstoffbahn (1) angeordnet ist, welches gemäß dem Schwerkraftprinzip arbeitet.    Device according to claims 6 to 9,
    characterized in that
    a curtain applicator (4) is arranged above a substantially horizontally guided fibrous web (1), which works according to the principle of gravity.         Vorrichtung nach Anspruch 6 bis 8,
    dadurch gekennzeichnet, dass
    das Vorhangs-Auftragswerk (3) waagrecht mit horizontaler Bewegungsrichtung des Vorhanges (3a) auf wenigstens einer Seite einer vertikal geführten Faserstoffbahn (1) angeordnet ist.    Device according to claims 6 to 8,
    characterized in that
    the curtain application unit (3) is arranged horizontally with the horizontal direction of movement of the curtain (3a) on at least one side of a vertically guided fibrous web (1).         Vorrichtung nach Anspruch 6 bis 10,
    dadurch gekennzeichnet, dass
    das Potenzial für die elektrostatische Aufladung der Faserstoffbahn (1) und/oder zur Erzeugung des elektrischen Feldes (F) zur Bewegungsrichtung des Vorhanges (3a) gegen die Schwerkraft eine Leistung von ca.12 bis 1000 W/m, eine Spannung von ca. 5 bis 60 kV und eine Stromstärke von o,1 bis 10 mA aufweist.    Device according to claims 6 to 10,
    characterized in that
    the potential for electrostatically charging the fibrous web (1) and / or for generating the electric field (F) for the direction of movement of the curtain (3a) against gravity, a power of approx. 12 to 1000 W / m, a voltage of approx. 5 up to 60 kV and a current of 0.1 to 10 mA.         Vorrichtung nach Anspruch 6 bis 10,
    dadurch gekennzeichnet, dass
    die Felderzeugungseinrichtungen (6, 7) oberhalb der im Wesentlichen horizontal laufenden Faserstoffbahn (1) angeordnet sind.    Device according to claims 6 to 10,
    characterized in that
    the field generating devices (6, 7) are arranged above the essentially horizontally running fibrous web (1).         Vorrichtung nach Anspruch 6 bis 10,
    dadurch gekennzeichnet, dass
    die Felderzeugungseinrichtungen (7) bei im Wesentlichen vertikal laufender Faserstoffbahn (1) jeweils beiden Bahnseiten (1a, 1b) zugeordnet sind.    Device according to claims 6 to 10,
    characterized in that
    the field generating devices (7) are each assigned to both web sides (1a, 1b) when the fibrous web (1) runs essentially vertically.
    EP03101583A 2002-06-21 2003-06-02 Process and apparatus for applying onto one side or both sides a fluid to pasty medium Expired - Lifetime EP1375746B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10227934A DE10227934A1 (en) 2002-06-21 2002-06-21 Method and device for applying a liquid to pasty medium on one or both sides
    DE10227934 2002-06-21

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    EP1375746A1 true EP1375746A1 (en) 2004-01-02
    EP1375746B1 EP1375746B1 (en) 2006-05-24

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    WO2004001133A2 (en) * 2002-06-24 2003-12-31 Voith Paper Patent Gmbh Device for coating and drying the front and back of a web, particularly one consisting of paper or cardboard
    WO2005059250A1 (en) * 2003-12-17 2005-06-30 Voith Paper Patent Gmbh Curtain application system
    WO2009000715A1 (en) * 2007-06-26 2008-12-31 Voith Patent Gmbh Application method and curtain applicator unit
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    Also Published As

    Publication number Publication date
    DE10227934A1 (en) 2004-01-08
    DE50303434D1 (en) 2006-06-29
    EP1375746B1 (en) 2006-05-24
    ATE327379T1 (en) 2006-06-15

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