EP0399147A2 - Coating device for a strip around a roller - Google Patents

Coating device for a strip around a roller Download PDF

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Publication number
EP0399147A2
EP0399147A2 EP90103325A EP90103325A EP0399147A2 EP 0399147 A2 EP0399147 A2 EP 0399147A2 EP 90103325 A EP90103325 A EP 90103325A EP 90103325 A EP90103325 A EP 90103325A EP 0399147 A2 EP0399147 A2 EP 0399147A2
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EP
European Patent Office
Prior art keywords
roller
metering
gap
application
counter
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
EP90103325A
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German (de)
French (fr)
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EP0399147A3 (en
EP0399147B1 (en
Inventor
Herbert Sommer
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Jagenberg AG
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Jagenberg AG
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Publication date
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Priority to AT90103325T priority Critical patent/ATE91921T1/en
Publication of EP0399147A2 publication Critical patent/EP0399147A2/en
Publication of EP0399147A3 publication Critical patent/EP0399147A3/en
Application granted granted Critical
Publication of EP0399147B1 publication Critical patent/EP0399147B1/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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • 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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • 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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/041—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters

Definitions

  • the invention relates to a device for coating a material web, in particular a paper or cardboard web, guided around a counter roller, according to the preamble of patent claim 1.
  • flooded-nip coater for applying coating material in excess and a subsequent metering system
  • the metering system contains a pre-metering device with which a large part of the coating material applied in excess, e.g. B. coating color, is removed, then is scraped with a final metering device to the desired coat weight.
  • the use of a pre-metering device has the advantage that just as much excess is carried along for final metering as is necessary for sufficient rinsing on the final metering element and that the same conditions exist across the entire web width by equalizing the irregular excess behind the application gap.
  • An elastically supported pre-metering element is used there at a distance from the application gap between the application roller and the counter roller. Between the pre-metering element and the application gap there is a wedge-shaped tapered guide body for guiding the coating material, which is provided in front of the pre-metering element with openings through which the doctored coating material runs in the direction of the application roller.
  • predosing devices which operate according to the hydrodynamic principle, that is to say directly against the liquid pressure on the material web (as described in DE-PS 36 23 402), are difficult to control.
  • These elastically supported pre-metering devices require a noticeable contact pressure against the liquid to function. It has been shown that even at the slightest contact pressure, the dewatering of the coating material is already too strong, which causes rheological problems during the final metering, which are noticeable in the so-called "bleeding" and / or streaks on the material web . The desired positive effect of drainage then turns into negative.
  • the invention has for its object to provide a generic device with which even at high web speeds better coverage is achieved with a smaller amount of application and reduced contact forces on the end metering device.
  • the uniformity of the pre-metering gap is ensured over the web width.
  • the adjustability according to claim 3 enables the pre-metering gap to be set independently of the order gap.
  • the effective liquid pressure contributes to the uniform support of the pre-metering device on the application roller, and it is prevented that hydrodynamic forces lift the pre-metering device from the application roller.
  • claims 5 and 6 contain features that simplify maintenance, with the cavities serving as cooling channels according to claim 7, color deposits can be avoided. With the guide plate according to claim 8, the ink application with the application roller is further evened out.
  • the coating device has an applicator unit 1 with a rotating application roller 2, which conveys coating material in a known manner from a liquid chamber 4 connected to an inlet 3 into an application nip 5 which is located between the application roller 2 and a counter roller 6 around which the Material web 7 is guided.
  • a baffle 8 extending into the application gap 5 is arranged, which on its side facing the application roller 2 is curved in accordance with the circumference of the application roller 2 and is arranged at a short distance therefrom, so that a conveyor gap 9 remains free.
  • the side of the guide plate 8 facing away from the applicator roller 2 forms a return surface for excess material 10, which is fed to a collecting line 12 via a return line 11.
  • a metering system 13 follows in the web running direction, which consists of a pre-metering device 14 and a final metering device 15.
  • the pre-metering device 14 shown in more detail in FIG. 2 has, as the base body 16, a flat hollow profile (for example made of aluminum coated with corrosion protection) which extends across the working width and whose cavities 17 are flowed through by a cooling liquid as cooling channels.
  • the base body 16, which is arranged approximately tangentially to the application roller 2, is displaceably mounted on its side facing away from the counter roller 6 on a support 18 of a pivotable frame 19 approximately tangentially to the application roller 2 in the direction of the counter roller 6.
  • the other side extends into the area of order gap 5 and is supported there by Outflow openings 20 interrupted projections 21 firmly and inelastically on the application roller 2.
  • the projections 21 are coated on their surface on the application roller 2 with little wear or there are separate wear plates there.
  • the face 16.1 of the base body 16 facing the counter-roller 6 - it forms the inflow surface for the coating material emerging from the application gap 5 - extends at an angle greater than 90 ° to the tangent in the support line of the base body 16 to the application roller 2 and thus forms with the Counter-roller 5 has a pre-metering nip 22 tapering to an acute angle.
  • the end face 16.1 of the base body 16 closes off the application nip 5 in the form of a chamber on the outlet side, only the narrow pre-metering nip 22 and outflow channels 23 remaining free along the surface of the application roller 2.
  • the pre-metering gap 22 can be adjusted very precisely and independently of the application gap 5 between the application roller 2 and the counter roller 6 by moving the base body 16 on the carrier 18. At its narrowest point, it is much narrower than order gap 5.
  • the base body 16 is formed on its side facing the applicator roller 2 in the area corresponding to its circumference and is kept at a distance with the projections 21 so that the outflow channels 23 are formed, through which excess coating material can flow, so that no pressure between the Applicator roller 2 and the base body 16 that would lift it off. Lifting of the base body 15 from the application roller 2 is also avoided by the end face 16.1 arranged at an obtuse angle to the tangent to the application roller 2, since the liquid pressure building up in the pre-metering gap 22 presses the base body 16 against the roller 2. This also ensures that the base body 16 rests evenly on the applicator roller 2 and thus an over the working width of the uniform pre-metering gap 22 is created.
  • the base body 16 can rest directly on the application roller 2. Then its overlying side contains holes or slots that form outflow channels. In order to ensure that the base body 16 is securely placed on the application roller 2, a pretensioned spring plate 24 is fastened on its side facing away from the application roller 2 and presses the base body 16 against the application roller 2. The excess coating material flowing out through the outflow channel 23 is fed to the manifold 12 via a chamber 25.
  • the inflow surface of the base body 16 delimiting the pre-metering gap 22 can be formed directly by the end face 16.1 thereof. In this case, it is advantageous to design the edge adjacent the counter roller 6, which delimits the narrowest point of the pre-metering gap 22, as a wearing part; e.g. in that a replaceable wire is inserted at this point.
  • the inflow surface is formed by a short blade 26, which is held by permanent magnets 27 in the exemplary embodiment. The blade 26 is thus interchangeable when worn.
  • the final metering device 15 contains a doctor knife 28 as a metering element, which is clamped with its foot in a clamping bar 29 and is supported by a support bar 30.
  • the final metering gap 28.1 exists between the doctor knife tip and the paper web 7.
  • other known final metering elements can also be used, for example a driven doctor rod or a scraper bar, as described in DE-PS 33 38 323.
  • the gap width of the application gap 5 can advantageously be increased to values between 1 and 3 mm even at high web speeds (1000-2000 m / min), without air inclusions having a negative effect on the line pattern. Due to the accumulation effect in the application gap 5 by the pre-metering element 14, an equalization of the coating material applied in excess (e.g. coating color) is brought about, to which the guide plate 8 also contributes by separating the coating material flowing into the application gap 5 from the returning coating material.
  • the excess film applied in the application gap 5 is then reduced with the pre-metering device 14 to a substantially smaller excess amount, which is then doctored down to the desired coating weight with the final metering element (scraper knife 28). It has proven to be advantageous for the uniformity of the line application if the opening widths of the various gaps 5 or 22 or 28.1 are approximately in the following relationship to one another: application gap 5: pre-metering gap 22: final metering gap 28.1 approximately 50: 10: 1.
  • the pre-metering device 14 according to the invention almost no pressure is exerted during pre-metering on the applied excess film, since the pre-metering device 14 does not work against the liquid pressure, but is supported firmly and thus inelastically. In this way, the problems at the end of dosing due to excessive drainage, such as boiling over and streaking, are avoided.
  • the cooling by means of the cooling channels through the cavities 17 prevents deposits of coating material.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Ticket-Dispensing Machines (AREA)
  • Enzymes And Modification Thereof (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

In a device for coating a web of material (7) guided about a mating roller (6) having an application roller (2) which is fed from a liquid chamber (3) and forms with the mating roller (6) an application gap (5), and having a metering system (13) with a premetering device (14) and a final metering device (15), according to the invention the premetering device (14) is constructed in such a way that it extends into the area of the application gap (5) and limits the latter in a chamber shape on the outlet side, a premetering gap (22) remaining free towards the mating roller (6) and discharge channels (23) remaining free towards the application roller (2). In addition, the premetering device (14) is supported in an inelastic fashion, preferably on the application roller (2). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Beschichten einer um eine Gegenwalze geführten Materialbahn, insbesondere einer Papier- oder Kartonbahn, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for coating a material web, in particular a paper or cardboard web, guided around a counter roller, according to the preamble of patent claim 1.

Bei Vorrichtungen zum Beschichten einer Materialbahn, die ein Auftragwerk mit einer aus einer Flüssigkeitskammer schöpfenden Auftragwalze ("flooded-nip coater") zum Auftragen von Beschichtungsmaterial im Überschuß und ein nachfolgendes Dosiersystem enthalten, ist es bekannt, das Dosiersystem zweistufig auszubilden. Das Dosiersystem enthält eine Vordosiereinrichtung, mit der ein großer Teil des im Überschuß aufgetragenen Beschichtungsmaterials, z. B. Streichfarbe, entfernt wird, anschließend wird mit einer Enddosiereinrichtung bis auf das gewünschte Strichgewicht abgerakelt. Der Einsatz einer Vordosiereinrichtung hat den Vorteil, daß zum Enddosieren gerade soviel Überschuß mitgeführt wird, wie für eine ausreichende Spülung am Enddosierelement erforderlich ist und daß am Enddosierelement durch Egalisierung des unregelmäßigen Überschusses hinter dem Auftragspalt gleiche Verhältnisse über die gesamte Bahnbreite bestehen. Man ist dabei bemüht, den Vordosiervorgang so einzustellen, daß eine teilweise Entwässerung einer dünnen, der Materialbahn nahen Grenzschicht des Beschichtungsmaterials stattfindet, in der die Festbestandteile (Pigmente und Bindemittel) des Beschichtungsmaterials weitestgehend immobilisiert sind. Die sich auf diese Weise bildende Schicht wirkt dann während des Enddosierens als Sperrschicht und verhindert das Eindringen von Festbestandteilen des Beschichtungsmaterials in die Papierbahn.In devices for coating a material web, which contain an application unit with an application roller ("flooded-nip coater") for applying coating material in excess and a subsequent metering system, it is known to design the metering system in two stages. The metering system contains a pre-metering device with which a large part of the coating material applied in excess, e.g. B. coating color, is removed, then is scraped with a final metering device to the desired coat weight. The use of a pre-metering device has the advantage that just as much excess is carried along for final metering as is necessary for sufficient rinsing on the final metering element and that the same conditions exist across the entire web width by equalizing the irregular excess behind the application gap. One tries to adjust the pre-metering process so that a partial Dewatering of a thin boundary layer of the coating material close to the material web takes place, in which the solid components (pigments and binders) of the coating material are largely immobilized. The layer formed in this way then acts as a barrier layer during the final metering and prevents the penetration of solid components of the coating material into the paper web.

Eine gattungsgemäße Vorrichtung, die dieses Ziel verfolgt, ist in der DE-PS 36 23 402 beschrieben. Dort ist mit Abstand von dem zwischen Auftragwalze und Gegenwalze befindlichen Auftragspalt ein elastisch abgestütztes Vordosierelement eingesetzt. Zwischen dem Vordosierelement und dem Auftragspalt befindet sich ein sich keilförmig verjüngender Leitkörper zur Führung des Beschichtungsmaterials, der vor dem Vordosierelement mit Öffnungen versehen ist, durch die das abgerakelte Beschichtungsmaterial in Richtung zur Auftragwalze abläuft.A generic device that pursues this goal is described in DE-PS 36 23 402. An elastically supported pre-metering element is used there at a distance from the application gap between the application roller and the counter roller. Between the pre-metering element and the application gap there is a wedge-shaped tapered guide body for guiding the coating material, which is provided in front of the pre-metering element with openings through which the doctored coating material runs in the direction of the application roller.

In der Praxis hat sich jedoch als Nachteil gezeigt, daß Vordosiereinrichtungen, die nach dem hydrodynamischen Prinzip, also direkt gegen den Flüssigkeitsdruck auf der Materialbahn arbeiten (wie in der DE-PS 36 23 402 beschrieben), nur schwer kontrollierbar sind. Diese elastisch abgestützten Vordosiereinrichtungen benötigen zur Funktion einen merklichen Anpreßdruck gegen die Flüssigkeit. Es hat sich gezeigt, daß selbst bei geringstem Anpreßdruck die Entwässerung des Beschichtungsmaterials bereits zu stark ist, wodurch bei der Enddosierung rheologische Probleme auftreten, die sich im sogenannten "Überkochen" (engl. "bleeding") und/oder Streifen auf der Materialbahn bemerkbar machen. Der gewünschte positive Effekt der Entwässerung schlägt dann ins Negative um.In practice, however, it has been shown to be a disadvantage that predosing devices which operate according to the hydrodynamic principle, that is to say directly against the liquid pressure on the material web (as described in DE-PS 36 23 402), are difficult to control. These elastically supported pre-metering devices require a noticeable contact pressure against the liquid to function. It has been shown that even at the slightest contact pressure, the dewatering of the coating material is already too strong, which causes rheological problems during the final metering, which are noticeable in the so-called "bleeding" and / or streaks on the material web . The desired positive effect of drainage then turns into negative.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung zu schaffen, mit der auch bei hohen Bahngeschwindig­keiten eine bessere Abdeckung bei geringerer Auftragmenge und reduzierten Anpreßkräften an der Enddosiereinrichtung erreicht wird.The invention has for its object to provide a generic device with which even at high web speeds better coverage is achieved with a smaller amount of application and reduced contact forces on the end metering device.

Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst. Nach der Erfindung werden konstruktiv einfach zwei vorteilhafte Auswirkungen erreicht. Zum einen ist es aufgrund der unelastischen Abstützung der Vordosiereinrichtung möglich nahezu ohne Druck auf den aufgetragenen Überschußfilm vorzudosieren. Damit werden die vorhin geschilderten Nachteile vermieden. Zum anderen wird mit der kammerförmigen Begrenzung des Auftragspaltes eine Stauwirkung erzielt, die eine Erweiterung des Auftragspaltes ermöglicht. Dies reduziert die Druckpenetration im Auftragspalt erheblich, so daß weniger Streichfarbe in das Papier gedrückt wird, ohne daß bei hohen Bahngeschwindigkeiten Unregelmäßigkeiten im Auftrag (z. B. Lufteinschlüsse) auftreten.This object is achieved with the features of claim 1. According to the invention, two advantageous effects are achieved in a structurally simple manner. On the one hand, because of the inelastic support of the pre-metering device, it is possible to pre-meter almost without pressure on the excess film applied. This avoids the disadvantages described above. On the other hand, the chamber-shaped delimitation of the application gap achieves an accumulation effect, which enables the application gap to be widened. This considerably reduces the pressure penetration in the application gap, so that less coating ink is pressed into the paper without irregularities in the application (e.g. air pockets) occurring at high web speeds.

Die Unteransprüche enthalten bevorzugte, da besonders vorteilhafte Ausführungsformen der Erfindung.The subclaims contain preferred, since particularly advantageous, embodiments of the invention.

Mit der Abstützung der Vordosiereinrichtung auf der Auftragwalze nach Anspruch 2 wird die Gleichmäßigkeit des Vordosierspaltes über die Bahnbreite sichergestellt. Die Verstellbarkeit nach Anspruch 3 ermöglicht eine Einstellung des Vordosierspaltes unabhängig vom Auftragspalt. Bei der Anordnung der angeströmten Stirnfläche nach Anspruch 4 trägt der wirksame Flüssigkeitsdruck zur gleichmäßigen Auflage der Vordosiereinrichtung auf der Auftragwalze bei, und es wird verhindert, daß hydrodynamische Kräfte die Vordosiereinrichtung von der Auftragwalze abheben.With the support of the pre-metering device on the applicator roller according to claim 2, the uniformity of the pre-metering gap is ensured over the web width. The adjustability according to claim 3 enables the pre-metering gap to be set independently of the order gap. In the arrangement of the flow face, according to claim 4, the effective liquid pressure contributes to the uniform support of the pre-metering device on the application roller, and it is prevented that hydrodynamic forces lift the pre-metering device from the application roller.

Während die Ansprüche 5 und 6 Merkmale enthalten, die die Wartung vereinfachen, lassen sich mit den als Kühlkanäle dienenden Hohlräumen nach Anspruch 7 Farbablagerungen vermeiden. Mit dem Leitblech nach Anspruch 8 wird der Farbauftrag mit der Auftragwalze weiter vergleichmäßigt.While claims 5 and 6 contain features that simplify maintenance, with the cavities serving as cooling channels according to claim 7, color deposits can be avoided. With the guide plate according to claim 8, the ink application with the application roller is further evened out.

Die Zeichnung dient zur Erläuterung der Erfindung anhand eines vereinfacht dargestellten Ausführungsbeispiels.
Es zeigen:

  • Fig. 1 eine Seitenansicht einer erfindungsgemäßen Beschichtungs­vorrichtung,
  • Fig. 2 einen vergrößerten Ausschnitt von Fig. 1 mit dem Vordosierelement.
The drawing serves to explain the invention with reference to an embodiment shown in simplified form.
Show it:
  • 1 is a side view of a coating device according to the invention,
  • Fig. 2 shows an enlarged section of Fig. 1 with the pre-metering element.

Die Beschichtungsvorrichtung weist ein Auftragwerk 1 mit einer umlaufenden Auftragwalze 2 auf, die in bekannter Weise aus einer mit einem Zulauf 3 in Verbindung stehenden Flüssigkeitskammer 4 Beschichtungsmaterial in einen Auftragspalt 5 fördert, der sich zwischen der Auftragwalze 2 und einer Gegenwalze 6 befindet, um die die Materialbahn 7 geführt ist. An der Einlaufseite ist ein bis in den Auftragspalt 5 reichendes Leitblech 8 angeordnet, das an seiner der Auftragwalze 2 zugewandten Seite entsprechend dem Umfang der Auftragwalze 2 gekrümmt und mit einem geringen Abstand von dieser angeordnet ist, so daß ein Förderspalt 9 frei bleibt. Die der Auftragwalze 2 abgewandte Seite des Leitbleches 8 bildet eine Rücklauffläche für überschüssiges Material 10, das über eine Rücklaufleitung 11 einer Sammelleitung 12 zugeführt wird.The coating device has an applicator unit 1 with a rotating application roller 2, which conveys coating material in a known manner from a liquid chamber 4 connected to an inlet 3 into an application nip 5 which is located between the application roller 2 and a counter roller 6 around which the Material web 7 is guided. At the inlet side, a baffle 8 extending into the application gap 5 is arranged, which on its side facing the application roller 2 is curved in accordance with the circumference of the application roller 2 and is arranged at a short distance therefrom, so that a conveyor gap 9 remains free. The side of the guide plate 8 facing away from the applicator roller 2 forms a return surface for excess material 10, which is fed to a collecting line 12 via a return line 11.

Im Anschluß an das Auftragwerk 1 folgt in Bahnlaufrichtung ein Dosiersystem 13, das aus einer Vordosiereinrichtung 14 und einer Enddosiereinrichtung 15 besteht. Die in der Fig. 2 detaillierter dargestellte Vordosiereinrichtung 14 weist als Grundkörper 16 ein sich über die Arbeitsbreite erstreckendes flaches Hohlprofil (z.B. aus mit Korrosionsschutz beschichtetem Aluminium) auf, dessen Hohlräume 17 als Kühlkanäle von einer Kühlflüssigkeit durchströmt werden. Der in etwa tangential zur Auftragwalze 2 angeordnete Grundkörper 16 ist an seiner der Gegenwalze 6 abgewandten Seite auf einem Träger 18 eines schwenkbaren Rahmens 19 in etwa tangential zur Auftragwalze 2 in Richtung zur Gegenwalze 6 verschiebbar gelagert. Die andere Seite reicht bis in den Bereich des Auftragspalts 5 und stützt sich dort mit von Abströmöffnungen 20 unterbrochenen Vorsprüngen 21 fest und unelastisch auf der Auftragwalze 2 ab. Die Vorsprünge 21 sind an ihrer auf der Auftragwalze 2 aufliegenden Fläche verschleißarm beschichtet oder es befinden sich dort separate Verschleißplättchen.Following the applicator 1, a metering system 13 follows in the web running direction, which consists of a pre-metering device 14 and a final metering device 15. The pre-metering device 14 shown in more detail in FIG. 2 has, as the base body 16, a flat hollow profile (for example made of aluminum coated with corrosion protection) which extends across the working width and whose cavities 17 are flowed through by a cooling liquid as cooling channels. The base body 16, which is arranged approximately tangentially to the application roller 2, is displaceably mounted on its side facing away from the counter roller 6 on a support 18 of a pivotable frame 19 approximately tangentially to the application roller 2 in the direction of the counter roller 6. The other side extends into the area of order gap 5 and is supported there by Outflow openings 20 interrupted projections 21 firmly and inelastically on the application roller 2. The projections 21 are coated on their surface on the application roller 2 with little wear or there are separate wear plates there.

Die der Gegenwalze 6 zugewandte Stirnfläche 16.1 des Grundkörpers 16 - sie bildet die Anströmfläche für das aus dem Auftragspalt 5 austretende Beschichtungsmaterial - verläuft unter einem Winkel größer als 90° zur Tangente in der Auflagelinie des Grundkörpers 16 an die Auftragwalze 2 geneigt und bildet somit mit der Gegenwalze 5 einen spitzwinkelig zulaufenden Vordosierspalt 22. Die Stirnfläche 16.1 des Grundkörpers 16 schließt den Auftragspalt 5 auslaufseitig kammerförmig ab, wobei nur der schmale Vordosierspalt 22 und Abströmkanäle 23 entlang der Oberfläche der Auftragwalze 2 freibleiben.The face 16.1 of the base body 16 facing the counter-roller 6 - it forms the inflow surface for the coating material emerging from the application gap 5 - extends at an angle greater than 90 ° to the tangent in the support line of the base body 16 to the application roller 2 and thus forms with the Counter-roller 5 has a pre-metering nip 22 tapering to an acute angle. The end face 16.1 of the base body 16 closes off the application nip 5 in the form of a chamber on the outlet side, only the narrow pre-metering nip 22 and outflow channels 23 remaining free along the surface of the application roller 2.

Der Vordosierspalt 22 läßt sich durch Verschieben des Grundkörpers 16 auf dem Träger 18 sehr genau und unabhängig vom Auftragspalt 5 zwischen Auftragwalze 2 und Gegenwalze 6 einstellen. Er ist an seiner engsten Stelle wesentlich enger als der Auftragspalt 5.The pre-metering gap 22 can be adjusted very precisely and independently of the application gap 5 between the application roller 2 and the counter roller 6 by moving the base body 16 on the carrier 18. At its narrowest point, it is much narrower than order gap 5.

Der Grundkörper 16 ist an seiner der Auftragwalze 2 zugewandten Seite in deren Bereich entsprechend zu deren Umfang gekrümmt ausgebildet und wird mit den Vorsprüngen 21 so auf Abstand gehalten, daß die Abströmkanäle 23 entstehen, durch die überschüssiges Beschichtungsmaterial abfließen kann, damit sich kein Druck zwischen der Auftragwalze 2 und dem Grundkörper 16 aufbaut, der diesen abheben würde. Ein Abheben des Grundkörpers 15 von der Auftragwalze 2 wird auch durch die stumpfwinkelig zur Tangente an die Auftragwalze 2 angeordnete Stirnfläche 16.1 vermieden, da so der sich im Vordosierspalt 22 aufbauende Flüssigkeitsdruck den Grundkörper 16 an die Walze 2 andrückt. Damit wird gleichzeitig gewährleistet, daß der Grundkörper 16 gleichmäßig auf der Auftragwalze 2 aufliegt und somit ein über die Arbeitsbreite gleichmäßiger Vordosierspalt 22 entsteht. Alternativ kann der Grundkörper 16 direkt auf der Auftragwalze 2 aufliegen. Dann enthält seine aufliegende Seite Bohrungen oder Schlitze, die Abströmkanäle bilden. Um ein sicheres Anlegen des Grundkörpers 16 an der Auftragwalze 2 zu sichern, ist auf seiner der Auftragwalze 2 abgewandten Seite ein vorgespanntes Federblech 24 befestigt, das den Grundkörper 16 gegen die Auftragwalze 2 andrückt. Das durch den Abströmkanal 23 abfließende überschüssige Beschichtungsmaterial wird über eine Kammer 25 der Sammelleitung 12 zugeführt.The base body 16 is formed on its side facing the applicator roller 2 in the area corresponding to its circumference and is kept at a distance with the projections 21 so that the outflow channels 23 are formed, through which excess coating material can flow, so that no pressure between the Applicator roller 2 and the base body 16 that would lift it off. Lifting of the base body 15 from the application roller 2 is also avoided by the end face 16.1 arranged at an obtuse angle to the tangent to the application roller 2, since the liquid pressure building up in the pre-metering gap 22 presses the base body 16 against the roller 2. This also ensures that the base body 16 rests evenly on the applicator roller 2 and thus an over the working width of the uniform pre-metering gap 22 is created. Alternatively, the base body 16 can rest directly on the application roller 2. Then its overlying side contains holes or slots that form outflow channels. In order to ensure that the base body 16 is securely placed on the application roller 2, a pretensioned spring plate 24 is fastened on its side facing away from the application roller 2 and presses the base body 16 against the application roller 2. The excess coating material flowing out through the outflow channel 23 is fed to the manifold 12 via a chamber 25.

Die den Vordosierspalt 22 begrenzende Anströmfläche des Grundkörpers 16 kann direkt von dessen Stirnfläche 16.1 gebildet sein. In diesem Fall ist es vorteilhaft, die der Gegenwalze 6 benachbarte Kante, die die engste Stelle des Vordosierspaltes 22 begrenzt, als Verschleißteil auszubilden; z.B. dadurch, daß an dieser Stelle ein austauschbarer Draht eingelegt ist. In der Ausführungsform nach Fig. 2 wird die Anströmfläche von einem kurzen Blade 26 gebildet, das beim Ausführungsbeispiel von Permanentmagneten 27 gehalten wird. Das Blade 26 ist so bei einem Verschleiß austauschbar.The inflow surface of the base body 16 delimiting the pre-metering gap 22 can be formed directly by the end face 16.1 thereof. In this case, it is advantageous to design the edge adjacent the counter roller 6, which delimits the narrowest point of the pre-metering gap 22, as a wearing part; e.g. in that a replaceable wire is inserted at this point. In the embodiment according to FIG. 2, the inflow surface is formed by a short blade 26, which is held by permanent magnets 27 in the exemplary embodiment. The blade 26 is thus interchangeable when worn.

Im Anschluß an die Vordosiereinrichtung 14 folgt eine auf bekannte Weise aufgebaute Enddosiereinrichtung 15, die an einem getrennt vom Rahmen 18 schwenkbaren Rahmen befestigt ist. Im vorliegenden Ausführungsbeispiel enthält die Enddosiereinrichtung 15 als Dosierelement ein Schabermesser 28, das mit seinem Fuß in einem Klemmbalken 29 festgeklemmt ist und von einer Abstützleiste 30 abgestützt ist. Zwischen der Schabermesserspitze und der Papierbahn 7 besteht im Betrieb der Enddosierspalt 28.1. Anstelle des Schabermessers 28 können auch andere bekannte Enddosierelemente eingesetzt werden, z.B. eine angetriebene Rakelstange oder eine Schaberleiste, wie sie in der DE-PS 33 38 323 beschrieben ist. Das beim Enddosieren abgeschabte überflüssige Beschichtungsmaterial wird von der Wanne 31 aufgefangen und über einen Ablaufkanal 32 und die Kammer 25 ebenfalls der Sammelleitung 12 zugeführt. Im Betrieb läßt sich bei der erfindungsgemäßen Vorrichtung die Spaltweite des Auftragspalts 5 auch bei hohen Bahngeschwindigkeiten (1000-2000 m/min) vorteilhaft auf Werte zwischen 1 und 3 mm vergrößern, ohne daß Lufteinschlüsse das Strichbild negativ beeinflussen. Durch die Stauwirkung im Auftragspalt 5 durch das Vordosierelement 14 wird eine Vergleichmäßigung des im Überschuß aufgetragenen Beschichtungsmaterials (z. B. Streichfarbe) bewirkt, wozu auch das Leitblech 8 durch die Trennung des in den Auftragspalt 5 zulaufenden Beschichtungsmaterials von dem rücklaufenden Beschichtungsmaterial beiträgt.Following the pre-metering device 14 is a known end metering device 15, which is fastened to a frame which can be pivoted separately from the frame 18. In the present exemplary embodiment, the final metering device 15 contains a doctor knife 28 as a metering element, which is clamped with its foot in a clamping bar 29 and is supported by a support bar 30. During operation, the final metering gap 28.1 exists between the doctor knife tip and the paper web 7. Instead of the scraper knife 28, other known final metering elements can also be used, for example a driven doctor rod or a scraper bar, as described in DE-PS 33 38 323. The superfluous coating material scraped off during the final metering is collected by the trough 31 and likewise fed to the collecting line 12 via an outlet channel 32 and the chamber 25. Operational In the device according to the invention, the gap width of the application gap 5 can advantageously be increased to values between 1 and 3 mm even at high web speeds (1000-2000 m / min), without air inclusions having a negative effect on the line pattern. Due to the accumulation effect in the application gap 5 by the pre-metering element 14, an equalization of the coating material applied in excess (e.g. coating color) is brought about, to which the guide plate 8 also contributes by separating the coating material flowing into the application gap 5 from the returning coating material.

Der im Auftragspalt 5 aufgetragene Überschußfilm wird anschließend mit der Vordosiereinrichtung 14 auf eine wesentlich geringere Überschußmenge reduziert, die danach mit dem Enddosierelement (Schabermesser 28) bis auf das gewünschte Strichgewicht abgerakelt wird. Es hat sich für die Gleichmäßigkeit des Strichauftrages als vorteilhaft erwiesen, wenn die Öffnungsweiten der verschiedenen Spalte 5 bzw. 22 bzw. 28.1 etwa im folgenden Verhältnis zueinander stehen: Auftragspalt 5 : Vordosierspalt 22 : Enddosierspalt 28.1 ungefähr 50 : 10 : 1.
Mit der Vordosiereinrichtung 14 nach der Erfindung wird nahezu kein Druck beim Vordosieren auf den aufgetragenen Überschußfilm ausgeübt, da die Vordosiereinrichtung 14 nicht gegen den Flüssigkeitsdruck arbeitet, sondern fest und somit unelastisch abgestützt ist. So werden die eingangs beschriebenen Probleme beim Enddosieren aufgrund zu starker Entwässerung, wie Überkochen und Streifenbildung, vermieden. Durch die Kühlung mittels der Kühlkanäle durch die Hohlräume 17 werden Ablagerungen von Beschichtungsmaterial verhindert.The excess film applied in the application gap 5 is then reduced with the pre-metering device 14 to a substantially smaller excess amount, which is then doctored down to the desired coating weight with the final metering element (scraper knife 28). It has proven to be advantageous for the uniformity of the line application if the opening widths of the various gaps 5 or 22 or 28.1 are approximately in the following relationship to one another: application gap 5: pre-metering gap 22: final metering gap 28.1 approximately 50: 10: 1.
With the pre-metering device 14 according to the invention, almost no pressure is exerted during pre-metering on the applied excess film, since the pre-metering device 14 does not work against the liquid pressure, but is supported firmly and thus inelastically. In this way, the problems at the end of dosing due to excessive drainage, such as boiling over and streaking, are avoided. The cooling by means of the cooling channels through the cavities 17 prevents deposits of coating material.

Claims (9)

1. Vorrichtung zum Beschichten einer um eine Gegenwalze geführten Materialbahn, insbesondere einer Papier- oder Kartonbahn, mit einer aus einer Flüssigkeitskammer schöpfenden Auftragwalze, die mit der Gegenwalze einen Auftragspalt bildet, und mit einem Dosiersystem mit einer Enddosiereinrichtung und einer in Bahnlaufrichtung davor angeordneten Vordosiereinrichtung, die mit der Gegenwalze einen Vordosierspalt bildet,
gekennzeichnet durch eine unelastisch abgestützte Vordosiereinrichtung (14), die bis in den Bereich des Auftragspaltes (5) reicht und diesen auslaufseitig kammerförmig begrenzt, wobei zur Gegenwalze (6) der Vordosierspalt (22) und zur Auftragwalze (2) ein Abströmkanal (23) freibleiben.1.Device for coating a material web guided around a counter roller, in particular a paper or cardboard web, with an application roller drawing from a liquid chamber, which forms an application gap with the counter roller, and with a metering system with a final metering device and a pre-metering device arranged in front of it in the direction of web travel, which forms a pre-metering gap with the counter roller,
characterized by an inelastically supported pre-metering device (14) which extends into the area of the application gap (5) and delimits it on the outlet side in the form of a chamber, the pre-metering gap (22) to the counter-roller (6) and an outflow channel (23) remaining free to the application roller (2) . 2. Vorrichtung nach Anspruch 1, dadurch gekenn­zeichnet, daß sich die Vordosiereinrichtung (14) auf der Auftragwalze (2) abstützt.2. Device according to claim 1, characterized in that the pre-metering device (14) is supported on the applicator roller (2). 3. Vorrrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Vordosiereinrichtung (14) in Richtung zur Gegenwalze (6) verstellbar ausgebildet ist.3. Device according to claim 1 or 2, characterized in that the pre-metering device (14) in the direction of the counter-roller (6) is adjustable. 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die vom Beschichtungsmaterial angeströmte Stirnfläche (16.1) der Vordosiereinrichtung (14) unter einem Winkel größer als 90° zur Tangente an die Auftragwalze (2) in der Auflagelinie verläuft.4. Device according to one of claims 1 to 3, characterized in that the face (16.1) of the pre-metering device (14) against which the coating material flows extends at an angle greater than 90 ° to the tangent to the application roller (2) in the support line. 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die angeströmte Stirnfläche (16.1) von einem austauschbaren Blade (26) gebildet wird.5. Device according to one of claims 1 to 4, characterized in that the flow against the end face (16.1) is formed by an exchangeable blade (26). 6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß an in die der Gegenwalze (6) benachbarte Kante der angeströmten Stirnfläche (16.1) der Vordosiereinrichtung (14) ein austauschbares Verschleißteil, insbesondere ein Draht, eingelegt ist.6. Device according to one of claims 1 to 5, characterized in that an exchangeable wear part, in particular a wire, is inserted into the edge of the face (16.1) of the pre-metering device (14) adjacent to the counter-roller (6). 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Vordosiereinrichtung (14) einen Grundkörper (16) mit als Kühlkanäle dienenden Hohlräumen (17) enthält.7. Device according to one of claims 1 to 6, characterized in that the pre-metering device (14) contains a base body (16) with cavities (17) serving as cooling channels. 8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß einlaufseitig an der Auftragwalze (2) ein Leitblech (8) angeordnet ist, das bis in den Auftragspalt (5) reicht.8. Device according to one of claims 1 to 7, characterized in that a guide plate (8) is arranged on the inlet side of the application roller (2), which extends into the application gap (5). 9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Verhältnis der Spaltweiten von Auftragspalt (5) : Vordosierspalt (22) : Enddosier­spalt (28.1) ungefähr 50 : 10 : 1 beträgt.9. Device according to one of claims 1 to 8, characterized in that the ratio of the gap widths of the application gap (5): pre-metering gap (22): final metering gap (28.1) is approximately 50: 10: 1.
EP90103325A 1989-05-22 1990-02-21 Coating device for a strip around a roller Expired - Lifetime EP0399147B1 (en)

Priority Applications (1)

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AT90103325T ATE91921T1 (en) 1989-05-22 1990-02-21 DEVICE FOR COATING A MATERIAL WEB FEED AROUND A COUNTER ROLLER.

Applications Claiming Priority (2)

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DE3916620A DE3916620A1 (en) 1989-05-22 1989-05-22 DEVICE FOR COATING A MATERIAL RAIL THROUGH A COUNTER ROLLER
DE3916620 1989-05-22

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EP0399147A2 true EP0399147A2 (en) 1990-11-28
EP0399147A3 EP0399147A3 (en) 1991-04-17
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EP (1) EP0399147B1 (en)
JP (1) JPH034959A (en)
AT (1) ATE91921T1 (en)
BR (1) BR9002358A (en)
CA (1) CA2017140A1 (en)
DE (2) DE3916620A1 (en)
ES (1) ES2052084T3 (en)
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US5246854A (en) * 1991-12-16 1993-09-21 The United States Of America As Represented By The Secretary Of Agriculture Attached growth biological reactor
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Also Published As

Publication number Publication date
ES2052084T3 (en) 1994-07-01
EP0399147A3 (en) 1991-04-17
FI902506A0 (en) 1990-05-21
JPH034959A (en) 1991-01-10
BR9002358A (en) 1991-08-06
CA2017140A1 (en) 1990-11-22
EP0399147B1 (en) 1993-07-28
DE59002072D1 (en) 1993-09-02
DE3916620A1 (en) 1990-12-06
US5117767A (en) 1992-06-02
ATE91921T1 (en) 1993-08-15

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