EP0482309B1 - Apparatus for coating both sides of a web - Google Patents

Apparatus for coating both sides of a web Download PDF

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Publication number
EP0482309B1
EP0482309B1 EP91113557A EP91113557A EP0482309B1 EP 0482309 B1 EP0482309 B1 EP 0482309B1 EP 91113557 A EP91113557 A EP 91113557A EP 91113557 A EP91113557 A EP 91113557A EP 0482309 B1 EP0482309 B1 EP 0482309B1
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EP
European Patent Office
Prior art keywords
web
coating material
application
coating
press
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EP91113557A
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German (de)
French (fr)
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EP0482309A1 (en
Inventor
Reinhard Knop
Volker Fäthke
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Jagenberg AG
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Jagenberg AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • 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
    • B05C1/12—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 fed round the roller
    • 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
    • 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 device for coating a material web on both sides, in particular a paper or cardboard web, according to the preamble of patent claim 1.
  • Devices with a pair of press rolls are known for applying glue (starch, CMC, synthetic glue) or pigment dispersions to paper or cardboard webs on both sides, the web being guided through the press nip.
  • glue starch, CMC, synthetic glue
  • An application and metering system is arranged on each of the press rolls, which first applies a metered film of coating material to each press roll, which is then transferred to the web in the press nip.
  • a generic device is described in DE-GM 84 14 413.
  • a nozzle chamber which is open towards the press roll is used as the application and metering system and has a metering element which can be pressed against the press roll at its outlet end is completed.
  • a metering rod is used as the metering element, which has circumferential grooves which were produced by wrapping it with a wire.
  • the amount of coating material applied to a roller can be influenced via the groove cross section.
  • Other known metering elements are doctor bars with a smooth surface, doctor blades or doctor strips. With these elements, the application weight can be varied using the contact pressure.
  • EP-A-0 186 620 it is known on printing presses to determine the film thickness of a mixture of oily material and water on a cylinder of the inking unit by means of infrared absorption. Based on the measurement, a predetermined film thickness is set on the cylinder which is dependent on the printing speed and ambient temperature.
  • the invention has for its object to improve a generic device so that the amount of coating material applied by each system can be determined for separate adjustment and / or control of the application and metering systems.
  • the amount of coating material taken up by the web is determined not directly on the web, but on each of the press rolls before being transferred to the web. This enables the quantitative determination of the coating material delivered to the web by each application and metering system.
  • Another advantage is that when using dosing elements that are subject to wear - z. B. wire-wound doctor rods -, monitoring of wear is possible in order to be able to exchange worn out dosing elements early. Because of the wear, the quantity applied to the respective press roll changes; when a certain limit value is reached, the metering elements can be changed so that damage to the roll surface due to wire breakage, etc. is avoided.
  • the second measuring device on each press roll according to claim 2 each measures the amount of coating material not taken up by the material web before the rolls are newly coated. This enables an even more precise determination of the amount of coating material actually taken up by the material web, in particular in the case of types of paper or cardboard in which the transfer from a press roller to the web cannot be exactly predetermined.
  • Measuring devices for determining the amount of water on the press rolls according to claim 3 are sufficient in many applications to be able to set or control the coating device exactly.
  • the proportion of solid constituents applied to the web can be calculated with sufficient accuracy from the composition of the coating material.
  • Measuring systems based on infrared absorption have been found to be particularly advantageous. They use the effect that molecular compounds, e.g. B. OH and CH, absorb light energy at precisely defined wavelengths. For this purpose, a light beam emitted by a halogen lamp is emitted onto the measuring surface to be tested (coated press roll surface). The reflected radiation is collected and evaluated. So a quantity of substance on the roller surfaces can be measured directly and the proportion absorbed by the web, e.g. B. determine the amount of water or solids.
  • molecular compounds e.g. B. OH and CH
  • Fig. 1 shows roughly schematically a coating device according to the invention in side view.
  • the coating device shown in the drawing is integrated in a paper machine. It consists of two identical press rolls 1, 2, between which a press nip 3 is formed.
  • the paper web 4 to be coated is fed to the press nip 3 from above so that the press roll 1 is wrapped around a little.
  • the web 4 is deflected by a guide roller 5 to a drying device, not shown.
  • the press rolls 1, 2 are rubberized on their surface. Outside the area of the press nip 3, an application and metering system 6, 7 is arranged on each press roll 1, 2, which can be pivoted onto the respective press roll 1, 2 in the area not wrapped by the web 4.
  • Each of the application and metering systems 6, 7 has an application chamber 6.1, 7.1 which is open towards the respective press roll and into which the coating material is fed under pressure.
  • each application chamber 6.1, 7.1 is closed off by a metering element 6.2, 7.2, which strips off the excess coating material applied to the press roll 1 or 2 to the desired film thickness.
  • a metering rod with a structured surface that is to say elevations and depressions, is preferably used as the metering element, with which metering can be carried out volumentrically.
  • Such doctor rods are known. You assign z. B. circumferential grooves that are generated by wrapping with a wire.
  • doctor rods with a smooth surface, doctor blades or doctor strips can also be used as dosing elements.
  • a measuring system based on the absorption of infrared radiation is preferably used.
  • infrared radiation is generated by a halogen lamp, a spectrum of which is selected with filters and radiated onto the surface to be tested.
  • the reflected radiation is collected and evaluated by a concave receiver.
  • filters infrared radiation is preferably radiated onto the roller surfaces in a spectrum that contains wavelengths that are absorbed by OH compounds.
  • the water content of the coating material that is located on the roller surfaces can be determined quantitatively.
  • the coating material is delivered to the web 4 in the press nip 3.
  • the proportion of solids can be calculated from the composition of the coating material.
  • the device is calibrated at the beginning. For this purpose, different amounts are applied to the press rolls 1, 2 with the same water or solids content and the amounts taken up by the web are then measured; e.g. B. by weighing or moisture measurement directly on the web. With the calibration curve determined in this way, the amount of coating material taken up can be calculated directly from the amount on the roller surfaces during operation.
  • a further measuring device is arranged on each press roll 1, 2 in the area behind the press nip 3 and in front of the respective application and metering system 6, 7, with which the amount of coating material remaining on the roller surfaces after the transfer to the web 4 and before the new coating is determined.
  • the amount of coating material taken up by the material web 4 can thus be determined as the difference between the two respective measured values.
  • the amount of coating material applied to the web 4 by each application and metering system 6, 7 can be determined separately. This enables an even coating on both sides, in particular the even application of pigments on each side of the web.
  • the device according to the invention offers the possibility of monitoring the wear of metering elements. Due to the wear, the order quantity given to the respective press roll changes. With metering elements with a structured surface, the application quantity drops because the passage cross-section is reduced when worn. When a certain limit value is reached, the dosing elements can be exchanged early in order to avoid damage to the roller surface due to wire break etc.

Abstract

Apparatuses for coating both sides of a web (4) of material, in particular of a web of paper or cardboard, are known which have two pressing rollers (1, 2) arranged one next to the other, between which rollers a pressing gap (3) is formed through which the web (4) is guided. An application and metering system (6, 7) is arranged on each pressing roller (1, 2) outside the area of the pressing gap (3) and applies a metered film of coating material to each pressing roller (1, 2) which is subsequently transferred onto the web (4) in the pressing gap (3). According to the invention, a measuring device (8, 9) for continuously determining the amount of coating material applied to the rollers (1, 2) is arranged on each pressing roller (1, 2) in the direction of rotation behind the application and metering system (6, 7) and in front of the pressing gap (3). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum beidseitigen Beschichten einer Materialbahn, insbesondere einer Papier- oder Kartonbahn, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for coating a material web on both sides, in particular a paper or cardboard web, according to the preamble of patent claim 1.

Zum beidseitigen Auftragen von Leim (Stärke, CMC, synthetischer Leim) oder Pigmentdispersionen auf Papier- oder Kartonbahnen sind Vorrichtungen mit einem Preßwalzenpaar bekannt, wobei die Bahn durch den Preßspalt geführt wird. An jeder der Preßwalzen ist ein Auftrag- und Dosiersystem angeordnet, das zunächst auf jede Preßwalze einen dosierten Film von Beschichtungsmaterial aufträgt, der anschließend in dem Preßspalt an die Bahn übergeben wird.Devices with a pair of press rolls are known for applying glue (starch, CMC, synthetic glue) or pigment dispersions to paper or cardboard webs on both sides, the web being guided through the press nip. An application and metering system is arranged on each of the press rolls, which first applies a metered film of coating material to each press roll, which is then transferred to the web in the press nip.

Eine gattungsgemäße Vorrichtung ist in dem DE-GM 84 14 413 beschrieben. Als Auftrag- und Dosiersystem wird eine zur Preßwalze hin offene Düsenkammer verwendet, die an ihrem auslaufseitigen Ende von einem gegen die Preßwalze andrückbaren Dosierelement abgeschlossen ist. Als Dosierelement wird eine Rakelstange verwendet, die auf ihrem Umfang Rillen aufweist, die durch Umwicklung mit einem Draht erzeugt wurden. Die auf eine Walze aufgetragene Beschichtungsmaterialmenge läßt sich über den Rillenquerschnitt beeinflussen. Andere bekannte Dosierelemente sind Rakelstangen mit glatter Oberfläche, Schabermesser oder Schaberleisten. Bei diesen Elementen läßt sich das Auftragsgewicht über den Anpreßdruck variieren.A generic device is described in DE-GM 84 14 413. A nozzle chamber which is open towards the press roll is used as the application and metering system and has a metering element which can be pressed against the press roll at its outlet end is completed. A metering rod is used as the metering element, which has circumferential grooves which were produced by wrapping it with a wire. The amount of coating material applied to a roller can be influenced via the groove cross section. Other known metering elements are doctor bars with a smooth surface, doctor blades or doctor strips. With these elements, the application weight can be varied using the contact pressure.

Es ist bekannt, die auf eine Bahn aufgetragene Menge an Beschichtungsmaterial kontinuierlich direkt an der Bahn zu messen. Dazu werden radioaktiv strahlende Elemente eingesetzt und aus der Absorbtion der radioaktiven Strahlung kann das Strichgewicht und/oder die Feuchte der Bahn bestimmt werden. Zur Einstellung und/oder der Regelung der Auftragsgewichte getrennt für jede Seite sind die bekannten, direkt an der Bahn messenden Vorrichtungen nur bedingt geeignet, da nur die Gesamtmenge des beidseitig aufgetragenen Beschichtungsmaterials bestimmt werden kann.It is known to continuously measure the amount of coating material applied to a web directly on the web. For this purpose, radioactive elements are used and the coating weight and / or the moisture of the web can be determined from the absorption of the radioactive radiation. The known devices which measure directly on the web are only suitable to a limited extent for setting and / or regulating the application weights separately for each side, since only the total amount of coating material applied on both sides can be determined.

Aus der EP-A-0 186 620 ist es an Druckmaschinen bekannt, die Filmdicke einer Mischung aus öligem Material und Wasser auf einem Zylinder des Farbwerks mittels Infrarot-Absorbtion zu bestimmen. Auf Basis der Messung wird eine von der Druckgeschwindigkeit und Umgebungstemperatur abhängige, vorbestimmte Filmdicke auf dem Zylinder eingestellt.From EP-A-0 186 620 it is known on printing presses to determine the film thickness of a mixture of oily material and water on a cylinder of the inking unit by means of infrared absorption. Based on the measurement, a predetermined film thickness is set on the cylinder which is dependent on the printing speed and ambient temperature.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung so zu verbessern, daß zur getrennten Einstellung und/oder Regelung der Auftrag- und Dosiersysteme die von jedem System aufgetragene Beschichtungsmaterialmenge bestimmt werden kann.The invention has for its object to improve a generic device so that the amount of coating material applied by each system can be determined for separate adjustment and / or control of the application and metering systems.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst.This object is achieved with the characterizing features of patent claim 1.

Nach der Erfindung wird die von der Bahn aufgenommene Menge an Beschichtungsmaterial nicht direkt an der Bahn, sondern vor Übergabe an die Bahn auf jeder der Preßwalzen bestimmt. Dies ermöglicht die quantitative Bestimmung des von jedem Auftrag- und Dosiersystems an die Bahn abgegebenen Beschichtungsmaterials.According to the invention, the amount of coating material taken up by the web is determined not directly on the web, but on each of the press rolls before being transferred to the web. This enables the quantitative determination of the coating material delivered to the web by each application and metering system.

Als weiterer Vorteil tritt hinzu, daß bei Verwendung von Dosierelementen, die einem Verschleiß unterliegen - z. B. drahtumwickelte Rakelstangen -, eine Überwachung des Verschleißes möglich ist, um frühzeitig verschlissene Dosierelemente austauschen zu können. Aufgrund des Verschleißes ändert sich die an die jeweilige Preßwalze abgegebene Auftragsmenge, beim Erreichen eines bestimmten Grenzwertes kann ein Wechsel der Dosierelemente veranlaßt werden, so daß Beschädigungen der Walzenoberfläche durch Drahtbruch etc. vermieden werden.Another advantage is that when using dosing elements that are subject to wear - z. B. wire-wound doctor rods -, monitoring of wear is possible in order to be able to exchange worn out dosing elements early. Because of the wear, the quantity applied to the respective press roll changes; when a certain limit value is reached, the metering elements can be changed so that damage to the roll surface due to wire breakage, etc. is avoided.

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

Die zweite Meßeinrichtung an jeder Preßwalze nach Anspruch 2 mißt jeweils die nicht von der Materialbahn aufgenommene Menge an Beschichtungsmaterial bevor die Walzen neu beschichtet werden. Dies ermöglicht eine noch exaktere Bestimmung der tatsächlich von der Materialbahn aufgenommenen Beschichtungsmaterialmenge, insbesondere bei Papier- oder Kartonsorten, bei denen sich die Übergabe von einer Preßwalze an die Bahn nicht genau vorherbestimmen läßt.The second measuring device on each press roll according to claim 2 each measures the amount of coating material not taken up by the material web before the rolls are newly coated. This enables an even more precise determination of the amount of coating material actually taken up by the material web, in particular in the case of types of paper or cardboard in which the transfer from a press roller to the web cannot be exactly predetermined.

Meßeinrichtungen zur Bestimmung der Wassermenge auf den Preßwalzen nach Anspruch 3 sind in vielen Anwendungsfällen ausreichend, um die Beschichtungsvorrichtung exakt einzustellen oder regeln zu können. Der Anteil der auf die Bahn aufgetragenen festen Bestandteile läßt sich mit genügender Genauigkeit aus der Zusammensetzung des Beschichtungsmaterials berechnen.Measuring devices for determining the amount of water on the press rolls according to claim 3 are sufficient in many applications to be able to set or control the coating device exactly. The proportion of solid constituents applied to the web can be calculated with sufficient accuracy from the composition of the coating material.

Auf Basis von Infrarot-Absorbtion arbeitende Meßsysteme nach Anspruch 4 haben sich als besonders vorteilhaft gezeigt. Sie nutzen den Effekt, daß Molekularverbindungen, z. B. OH und CH, Lichtenergie bei genau definierten Wellenlängen absorbieren. Dazu wird ein von einer Halogenlampe abgesandter Lichtstrahl auf die zu prüfende Meßfläche (beschichtete Preßwalzenoberfläche) abgesandt. Die reflektierte Strahlung wird gesammelt und ausgewertet. So läßt sich eine auf den Walzenoberflächen befindliche Stoffmenge direkt messen und durch entsprechende Kalibrierung der von der Bahn aufgenommene Anteil, z. B. die Wasser- oder Feststoffmenge, bestimmen.Measuring systems based on infrared absorption have been found to be particularly advantageous. They use the effect that molecular compounds, e.g. B. OH and CH, absorb light energy at precisely defined wavelengths. For this purpose, a light beam emitted by a halogen lamp is emitted onto the measuring surface to be tested (coated press roll surface). The reflected radiation is collected and evaluated. So a quantity of substance on the roller surfaces can be measured directly and the proportion absorbed by the web, e.g. B. determine the amount of water or solids.

Die Zeichnung dient zur Erläuterung der Erfindung anhand eines vereinfacht dargestellten Ausführungsbeispiels.The drawing serves to explain the invention with reference to an embodiment shown in simplified form.

Fig. 1 zeigt grob schematisch eine Beschichtungsvorrichtung nach der Erfindung in Seitenansicht.Fig. 1 shows roughly schematically a coating device according to the invention in side view.

Die in der Zeichnung dargestellte Beschichtungsvorrichtung ist in eine Papiermaschine integriert. Sie besteht aus zwei gleich aufgebauten Preßwalzen 1, 2, zwischen denen ein Preßspalt 3 ausgebildet ist. Die zu beschichtende Papierbahn 4 wird dem Preßspalt 3 von oben so zugeführt, daß die Preßwalze 1 etwas umschlungen wird. Im Anschluß an die Beschichtungsvorrichtung wird die Bahn 4 von einer Leitwalze 5 zu einer nicht dargestellten Trocknungsvorrichtung umgelenkt.The coating device shown in the drawing is integrated in a paper machine. It consists of two identical press rolls 1, 2, between which a press nip 3 is formed. The paper web 4 to be coated is fed to the press nip 3 from above so that the press roll 1 is wrapped around a little. Following the coating device, the web 4 is deflected by a guide roller 5 to a drying device, not shown.

Die Preßwalzen 1, 2 sind an ihrer Oberfläche gummiert. Außerhalb des Bereichs des Preßspalts 3 ist an jeder Preßwalze 1, 2 ein Auftrag- und Dosiersystem 6, 7 angeordnet, das an die jeweilige Preßwalze 1, 2 im nicht von der Bahn 4 umschlungenen Bereich anschwenkbar ist. Jedes der Auftrag- und Dosiersysteme 6, 7 weist eine zur jeweiligen Preßwalze hin offene Auftragkammer 6.1, 7.1 auf, in die das Beschichtungsmaterial unter Druck zugeführt wird. Auslaufseitig wird jede Auftragkammer 6.1, 7.1 von einem Dosierelement 6.2, 7.2 abgeschlossen, das das im Überschuß auf die Preßwalze 1 bzw. 2 aufgetragene Beschichtungsmaterial bis auf die gewünschte Filmdicke abstreift. Als Dosierelement wird bevorzugt eine Rakelstange mit strukturierter, also Erhebungen und Vertiefungen aufweisender Oberfläche eingesetzt, mit der volumentrisch dosiert werden kann. Derartige Rakelstangen sind bekannt. Sie weisen z. B. Umfangsrillen auf, die durch Umwickeln mit einem Draht erzeugt werden. Alternativ können als Dosierelemente auch Rakelstangen mit glatter Oberfläche, Schabermesser oder Schaberleisten eingesetzt werden.The press rolls 1, 2 are rubberized on their surface. Outside the area of the press nip 3, an application and metering system 6, 7 is arranged on each press roll 1, 2, which can be pivoted onto the respective press roll 1, 2 in the area not wrapped by the web 4. Each of the application and metering systems 6, 7 has an application chamber 6.1, 7.1 which is open towards the respective press roll and into which the coating material is fed under pressure. On the outlet side, each application chamber 6.1, 7.1 is closed off by a metering element 6.2, 7.2, which strips off the excess coating material applied to the press roll 1 or 2 to the desired film thickness. A metering rod with a structured surface, that is to say elevations and depressions, is preferably used as the metering element, with which metering can be carried out volumentrically. Such doctor rods are known. You assign z. B. circumferential grooves that are generated by wrapping with a wire. Alternatively, doctor rods with a smooth surface, doctor blades or doctor strips can also be used as dosing elements.

An jeder Preßwalze 1, 2 ist in Drehrichtung hinter dem Auftrag- und Dosiersystem 6 bzw. 7 und vor dem Preßspalt 3 eine Meßeinrichtung 8, 9 zur kontinuierlichen Bestimmung der auf die Preßwalzen 1, 2 aufgetragenen Beschichtungsmaterialmenge angeordnet. Bevorzugt wird ein auf der Absorbtion von Infrarotstrahlung basierendes Meßsystem eingesetzt. Bei diesen Meßsystemen wird von einer Halogenlampe Infrarotstrahlung erzeugt, von der mit Filtern ein Spektrum selektiert und auf die zu prüfende Fläche gestrahlt wird. Die reflektierte Strahlung wird von einem konkaven Empfänger gesammelt und ausgewertet. Bevorzugt wird durch Einsatz entsprechender Filter Infrarotstrahlung in einem Spektrum auf die Walzenoberflächen gestrahlt, das Wellenlängen enthält, die von OH-Verbindungen absorbiert werden. Auf diese Weise läßt sich der Wasseranteil des Beschichtungsmaterials quantitativ ermitteln, das sich auf den Walzenoberflächen befindet. Das Beschichtungsmaterial wird im Preßspalt 3 an die Bahn 4 abgegeben. Der Anteil an Feststoffen kann aus der Zusammensetzung des Beschichtungsmaterials errechnet werden. Um das Übergabeverhalten im Preßspalt an die Bahn 4 bei der Berechnung berücksichtigen zu können, wird die Einrichtung zu Beginn kalibriert. Dazu werden bei gleichem Wasser- bzw. Feststoffgehalt unterschiedliche Mengen auf die Preßwalzen 1, 2 aufgetragen und anschließend die von der Bahn aufgenommenen Mengen gemessen; z. B. durch eine Wägung oder eine Feuchtemessung direkt an der Bahn. Mit der so ermittelten Eichkurve kann während des Betriebs die aufgenommene Menge an Beschichtungsmaterial direkt aus der sich auf den Walzenoberflächen befindlichen Menge errechnet werden.On each press roll 1, 2 is in the direction of rotation behind the application and metering system 6 or 7 and in front of the press nip 3, a measuring device 8, 9 for the continuous determination of the Press rolls 1, 2 applied amount of coating material arranged. A measuring system based on the absorption of infrared radiation is preferably used. In these measuring systems, infrared radiation is generated by a halogen lamp, a spectrum of which is selected with filters and radiated onto the surface to be tested. The reflected radiation is collected and evaluated by a concave receiver. By using appropriate filters, infrared radiation is preferably radiated onto the roller surfaces in a spectrum that contains wavelengths that are absorbed by OH compounds. In this way, the water content of the coating material that is located on the roller surfaces can be determined quantitatively. The coating material is delivered to the web 4 in the press nip 3. The proportion of solids can be calculated from the composition of the coating material. In order to be able to take into account the transfer behavior in the press nip to the web 4 in the calculation, the device is calibrated at the beginning. For this purpose, different amounts are applied to the press rolls 1, 2 with the same water or solids content and the amounts taken up by the web are then measured; e.g. B. by weighing or moisture measurement directly on the web. With the calibration curve determined in this way, the amount of coating material taken up can be calculated directly from the amount on the roller surfaces during operation.

Um die aufgenommene Menge an Beschichtungsmaterial direkt ermitteln zu können, ist bei einer anderen Ausführungsform der Erfindung an jeder Preßwalze 1, 2 im Bereich hinter dem Preßspalt 3 und vor dem jeweiligen Auftrag- und Dosiersystem 6, 7 eine weitere Meßeinrichtung angeordnet, mit der die auf den Walzenoberflächen verbliebende Beschichtungsmaterialmenge nach der Übergabe an die Bahn 4 und vor dem Neubeschichten bestimmt wird. Die von der Materialbahn 4 aufgenommene Beschichtungsmaterialmenge läßt sich so als Differenz zwischen den beiden jeweiligen Meßwerten ermitteln.In order to be able to directly determine the amount of coating material taken up, in another embodiment of the invention, a further measuring device is arranged on each press roll 1, 2 in the area behind the press nip 3 and in front of the respective application and metering system 6, 7, with which the the amount of coating material remaining on the roller surfaces after the transfer to the web 4 and before the new coating is determined. The amount of coating material taken up by the material web 4 can thus be determined as the difference between the two respective measured values.

Mittels der Meßeinrichtungen 8, 9 läßt sich die von jedem Auftrag- und Dosiersystem 6, 7 an die Bahn 4 aufgetragene Menge an Beschichtungsmaterial getrennt bestimmen. Dies ermöglicht eine gleichmäßige Beschichtung an beiden Seiten, insbesondere die gleichmäßige Auftragung von Pigmenten auf jede Bahnseite. Weiterhin bietet die erfindungsgemäße Vorrichtung die Möglichkeit, den Verschleiß von Dosierelementen zu überwachen. Aufgrund des Verschleißes ändert sich die an die jeweilige Preßwalze abgegebene Auftragsmenge. Bei Dosierelementen mit strukturierter Oberfläche sinkt die Auftragsmenge ab, da sich der Durchtrittsquerschnitt bei Verschleiß verringert. Bei Erreichen eines gewissen Grenzwertes können so die Dosierelemente frühzeitig ausgewechselt werden, um Beschädigungen der Walzenoberfläche durch Drahtbruch etc. zu vermeiden.By means of the measuring devices 8, 9, the amount of coating material applied to the web 4 by each application and metering system 6, 7 can be determined separately. This enables an even coating on both sides, in particular the even application of pigments on each side of the web. Furthermore, the device according to the invention offers the possibility of monitoring the wear of metering elements. Due to the wear, the order quantity given to the respective press roll changes. With metering elements with a structured surface, the application quantity drops because the passage cross-section is reduced when worn. When a certain limit value is reached, the dosing elements can be exchanged early in order to avoid damage to the roller surface due to wire break etc.

Claims (4)

  1. Apparatus for coating a paper or cardboard web (4) on both sides, having two press rollers (1, 2) which are disposed side by side and between which there is configured a nip (3) through which the web (4) is guided, and having for each press roller (1, 2) an application and metering system (6, 7), which is disposed outside the region of the nip (3), characterized in that for the separate determination of the quantity of coating material applied to the web (4) by each application and metering system (6, 7), at each press roller (1, 2), behind the application and metering system (6, 7) and in front of the nip (3) in the direction of rotation, there is disposed a measuring device (8, 9) for continuous determination of the quantity of coating material applied to the press rollers (1, 2).
  2. Apparatus according to Claim 1, characterized in that behind the nip (3) and in front of the application and metering system (6, 7) in the direction of rotation, on each press roller (1, 2), there is disposed a further measuring device for determining the quantity of coating material located on the roller surface.
  3. Apparatus according to Claims 1 or 2, characterized in that the measuring devices (8, 9), for determining the quantity of coating material, measure the water quantity.
  4. Apparatus according to one of Claims 1 to 3, characterized by a measuring system working on the basis of infrared absorption.
EP91113557A 1990-10-22 1991-08-13 Apparatus for coating both sides of a web Expired - Lifetime EP0482309B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033521 1990-10-22
DE4033521A DE4033521C2 (en) 1990-10-22 1990-10-22 Device for coating a material web on both sides

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EP0482309A1 EP0482309A1 (en) 1992-04-29
EP0482309B1 true EP0482309B1 (en) 1995-05-17

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EP (1) EP0482309B1 (en)
AT (1) ATE122586T1 (en)
DE (2) DE4033521C2 (en)
ES (1) ES2075278T3 (en)
FI (1) FI98709B (en)

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ATE210223T1 (en) * 1995-07-29 2001-12-15 Jagenberg Papiertech Gmbh APPLICATION SYSTEM FOR A DEVICE FOR COATING A PAPER OR CARDBOARD WEB
DE19527902B4 (en) * 1995-07-29 2004-02-26 Voith Paper Patent Gmbh Application system for a device for coating a paper or cardboard web
DE19627456A1 (en) * 1996-07-08 1998-01-15 Voith Sulzer Papiermasch Gmbh Coater for use in web products, especially paper or paper board
DE29714193U1 (en) * 1997-08-08 1997-10-16 Voith Sulzer Papiermasch Gmbh Device for coating a running web
DE19958109A1 (en) * 1999-12-02 2001-06-07 Voith Paper Patent Gmbh Assembly for the indirect coating of a moving paper/cardboard web has structured peripheral positions and peripheral angles around the transfer roller for an effective and consistent surface coating action
DE102004039162B4 (en) * 2004-08-11 2013-03-14 Horst Sprenger Gmbh Apparatus for coating paper and board webs
CN102302994B (en) * 2011-08-26 2013-08-28 安徽南澳地毯有限公司 Sizing leveling device for carpet
CN115228707B (en) * 2022-06-22 2023-12-19 杭州林伟工贸有限公司 Corrosion-resistant plastic spraying device for surface of welding net

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DE8414413U1 (en) * 1984-05-11 1987-11-19 J.M. Voith Gmbh, 7920 Heidenheim, De
EP0186620B1 (en) * 1984-12-24 1992-04-15 Mitsubishi Jukogyo Kabushiki Kaisha Method of controlling film thickness of mixture liquid layer of oil material and water in printing machines
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CN104437997A (en) * 2014-09-30 2015-03-25 浙江华祥皮革有限公司 Slurry storage table of coating machine
CN104437997B (en) * 2014-09-30 2017-01-11 浙江华祥皮革有限公司 Slurry storage table of coating machine

Also Published As

Publication number Publication date
FI914948A0 (en) 1991-10-21
DE4033521A1 (en) 1992-04-30
ATE122586T1 (en) 1995-06-15
EP0482309A1 (en) 1992-04-29
ES2075278T3 (en) 1995-10-01
DE59105512D1 (en) 1995-06-22
FI914948A (en) 1992-04-23
FI98709B (en) 1997-04-30
DE4033521C2 (en) 1994-12-01

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