EP1333124A2 - Process and apparatus for making a paper web - Google Patents

Process and apparatus for making a paper web Download PDF

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Publication number
EP1333124A2
EP1333124A2 EP03000981A EP03000981A EP1333124A2 EP 1333124 A2 EP1333124 A2 EP 1333124A2 EP 03000981 A EP03000981 A EP 03000981A EP 03000981 A EP03000981 A EP 03000981A EP 1333124 A2 EP1333124 A2 EP 1333124A2
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EP
European Patent Office
Prior art keywords
paper web
glue
wide nip
nip
roller
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
EP03000981A
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German (de)
French (fr)
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EP1333124A3 (en
EP1333124B1 (en
Inventor
Rüdiger Dr. Kurtz
Josef Schneid
Thomas Hermsen
Udo Gabbusch
Harald Hess
Rainer Fenske
Alexander Wassermann
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Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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Filing date
Publication date
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Publication of EP1333124A2 publication Critical patent/EP1333124A2/en
Publication of EP1333124A3 publication Critical patent/EP1333124A3/en
Application granted granted Critical
Publication of EP1333124B1 publication Critical patent/EP1333124B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • 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
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28—Addition before the dryer section, e.g. at the wet end or press section
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents

Definitions

  • the invention relates to a method for producing a Paper web with a glue coating on the Paper web applied and then the paper web through a press device is directed. Furthermore concerns the invention an apparatus for producing a paper web with a glue application device and one Press means.
  • Some types of paper are in the course of the manufacturing process a glue application required.
  • a liquid glue usually based on starch, applied to the paper web and the paper web then passed through one nip, followed by two Rolls is formed which the paper web with a predetermined Apply pressure.
  • the glue application or the glue coating primarily serves the To increase the strength of the paper web, in particular the Surface strength.
  • the invention has for its object the strength to improve the paper web.
  • the paper web is guided after the glue application through a wide nip.
  • the paper web has an essential longer stay. Accordingly, the glue coating into the paper web over a longer period of time pressed in or held in the paper web, so that it can take effect there.
  • the surface pressure in the wide nip is usually slightly smaller than a roller nip. The longer dwell time at lower pressure allows an improved connection of the glue with the fibers the paper web.
  • the paper web is preferably heated in the wide nip. This improves the strength, especially the surface strength, the paper web.
  • the paper web is preferably provided in a still moist state Condition with glue. This improves the absorption capacity the paper web for the glue.
  • the object is achieved in a device of the type mentioned Art solved in that the press device is designed as a wide nip press.
  • the broad nip press preferably has a hard roller and a circumferential coat and one on the curvature support shoe adapted to the hard roller, the presses the jacket against the roller, between the Roller and the jacket a nip is formed.
  • the Support shoe has a convex opposite the roller Surface on, so that the coat leading to this Must have some flexibility about one purpose relatively large portion of the circumference on the roller Plant is compared to a nip that is brought is formed between two rollers.
  • Such "Shoe press” is from some areas of the paper machine known. It mainly becomes Drying the paper web used. In the present In this case, however, it serves to apply the glue to even out and the glue in the paper web better let it work.
  • the wide nip press preferably has a temperature control device on. With the temperature control device it is possible to heat the paper web in the wide nip to for example the reaction of the glue in the wide nip accelerate.
  • the glue application device is preferably direct arranged in front of the Breitnippresse.
  • the glue will that is, immediately after application to the paper web pushed. He has no opportunity before Entering into the wide nip to harden or in annoying Measures to react chemically with the atmospheric oxygen.
  • the Breitnippresse is preferably in the middle of a Drying section of a paper machine arranged.
  • the paper web is not yet completely dry, but has a predetermined humidity. This Moisture makes it easier for the glue to penetrate into it Inside of the paper web so that not only the surface, but also underlying areas of the paper web can be solidified.
  • the jacket and the roller are preferably used as a liquid barrier educated. This prevents the Glue that is usually liquid or with the help of a Liquid is applied, escape in the wide nip can.
  • the broad nip press serves not to dry the web. It can even happen that through the application of glue the moisture of the Paper web is increased at least briefly.
  • a paper web 1 leaves the first only schematically illustrated section 2 of a dryer section, the in first third of the dryer section is arranged.
  • the Paper web 1 then passes through a glue application device 3, in which a glue 4 in liquid form on the paper web 1 is applied.
  • glue application such as by squeegee or by rolling into a Immerse liquid are also conceivable.
  • the paper web 1 then runs through a wide nip press 5, which is formed by a roller 6, the hard roller is formed, and a coat 7, which with the help a support shoe 8 over a length in the range of 70 up to 250 mm is pressed against the roller 6.
  • the support shoe 8 has a concave support surface 9, the Curvature essentially the curvature of the roller 6 is adjusted so that the jacket 7 over a relative large angular range pressed against the circumference of the roller 6 and thus a correspondingly wide nip 10 forms with the roller 6.
  • the interface between the jacket 7 and the support shoe 8 is hydraulic lubricated.
  • the jacket 7 is made of a well deformable Plastic formed.
  • the coat 7, the rest of the Support and holding elements not shown performed is sufficiently flexible to be in the shown way to be deformed.
  • the paper web After passing through the wide nip press 5, the paper web occurs 1 in a further section 11 of the dryer section the paper machine. Shown schematically are guide rollers 12, 13 over which the paper web is guided becomes.
  • a scraper 14 with which the Roller 6 can be cleaned continuously during operation.
  • the glue application device 3 is immediately before Nip 10 arranged.
  • the one shown in the drawing The distance is not to be understood to scale.
  • the Glue is applied just before entering the nip 10 that the glue has not had time to close solidify or change. This almost takes place overall reaction of the glue with paper web 1 in the nip 10, i.e. the Breitnip.
  • the dwell time of the paper web in the nip 10 is extraordinary due to the length of this nip high. This also applies at higher speeds the paper web 1. For this is the surface pressure, i.e. the compressive stress, versus one by two rollers formed nip relatively low.
  • the roller 6 and the jacket 7 are impermeable to liquids trained, i.e. the paper web 1 is in the Nip practically not dried. So it won't be Liquid squeezed out.
  • the glue 4 is rather in the paper web 1 pressed in. Even if he may does not penetrate the entire paper web 1, it leads to a noticeable solidification of the Surface.
  • the roller 6 can be heated so that the reaction time the glue 4 can be shortened with the paper web 1.
  • the dwell time of the paper web 1 in the nip 10 is so long that the glue 4 in the paper web 1 largely set has when the paper web 1 leaves the nip 10 again.
  • the paper web 1 has after leaving the first section 2 of the dryer section still a moisture of 90 up to 97%. This moisture content is related with the wide nip 10 so that the glue 4 distributed very evenly on the paper web 1. Any Irregularities in the application of glue become broad Nip 10 fairly balanced again.

Abstract

To coat the surface of a moving web (1) with glue, the glue is sprayed (3) on to the web surface, and then it passes directly through a wide nip (10) of the web drying section (2,11) in a papermaking machine. The wide nip is formed by a press unit (5), between a hard roller (6) and a rotating mantle (7). The web is preferably moist, for better glue absorption.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen einer Papierbahn, bei dem eine Leimbeschichtung auf die Papierbahn aufgetragen und die Papierbahn danach durch eine Presseneinrichtung geleitet wird. Ferner betrifft die Erfindung eine Vorrichtung zum Herstellen einer Papierbahn mit einer Leimauftragseinrichtung und einer Presseneinrichtung.The invention relates to a method for producing a Paper web with a glue coating on the Paper web applied and then the paper web through a press device is directed. Furthermore concerns the invention an apparatus for producing a paper web with a glue application device and one Press means.

Bei manchen Papierarten ist im Laufe des Herstellungsprozesses ein Leimauftrag erforderlich. Hierbei wird ein flüssiger Leim, der in der Regel auf Stärke basiert, auf die Papierbahn aufgebracht und die Papierbahn danach durch einen Nip geleitet, der durch zwei Walzen gebildet ist, die die Papierbahn mit einem vorbestimmten Druck beaufschlagen. Der Leimauftrag oder die Leimbeschichtung dient in erster Linie dazu, die Festigkeit der Papierbahn zu erhöhen, insbesondere die Oberflächenfestigkeit.Some types of paper are in the course of the manufacturing process a glue application required. Here will a liquid glue, usually based on starch, applied to the paper web and the paper web then passed through one nip, followed by two Rolls is formed which the paper web with a predetermined Apply pressure. The glue application or the glue coating primarily serves the To increase the strength of the paper web, in particular the Surface strength.

Es hat sich nun bei immer schneller laufenden Papiermaschinen gezeigt, daß mit dem Leimauftrag die gewünschte Festigkeitserhöhung der Papierbahn nicht immer erzielt werden konnte.It has now become faster and faster with paper machines shown that with the glue application the desired Strength increase in the paper web is not always achieved could be.

Der Erfindung liegt die Aufgabe zugrunde, die Festigkeit der Papierbahn zu verbessern.The invention has for its object the strength to improve the paper web.

Hierzu leitet man die Papierbahn nach dem Leimauftrag durch einen Breitnip.To do this, the paper web is guided after the glue application through a wide nip.

In einem Breitnip hat die Papierbahn eine wesentlich höhere Verweildauer. Dementsprechend wird die Leimbeschichtung über einen längeren Zeitraum in die Papierbahn hineingedrückt bzw. in der Papierbahn festgehalten, so daß sie dort zur Wirkung kommen kann. Zu der gegenüber einem normalen Walzennip verlängerten Einwirkzeit kommt, daß die Flächenpressung in dem Breitnip in der Regel etwas kleiner ist als bei einem Walzennip. Die längere Verweildauer bei geringerem Druck erlaubt eine verbesserte Verbindung des Leimes mit den Fasern der Papierbahn.In a wide nip, the paper web has an essential longer stay. Accordingly, the glue coating into the paper web over a longer period of time pressed in or held in the paper web, so that it can take effect there. To the prolonged exposure time compared to a normal roller nip comes that the surface pressure in the wide nip is usually slightly smaller than a roller nip. The longer dwell time at lower pressure allows an improved connection of the glue with the fibers the paper web.

Vorzugsweise beheizt man die Papierbahn im Breitnip. Dies verbessert die Festigkeit, insbesondere die Oberflächenfestigkeit, der Papierbahn weiter.The paper web is preferably heated in the wide nip. This improves the strength, especially the surface strength, the paper web.

Auch ist von Vorteil, wenn man die Leimbeschichtung unmittelbar vor dem Breitnip aufträgt. Im Breitnip wird dann der Leim vergleichmäßigt und in die Papierbahn hineingedrückt, ohne daß er vorher Gelegenheit hat, sich zu verfestigen. Dies gibt eine sehr gleichmäßige Festigkeitsstruktur innerhalb der Papierbahn.It is also an advantage if you apply the glue coating immediately before the wide nip. In the Breitnip then the glue is evened out and into the paper web pushed in without first having the opportunity to solidify. This gives a very smooth one Strength structure within the paper web.

Vorzugsweise versieht man die Papierbahn im noch feuchten Zustand mit Leim. Dies verbessert die Aufnahmefähigkeit der Papierbahn für den Leim.The paper web is preferably provided in a still moist state Condition with glue. This improves the absorption capacity the paper web for the glue.

Die Aufgabe wird bei einer Vorrichtung der eingangs genannten Art dadurch gelöst, daß die Presseneinrichtung als Breitnippresse ausgebildet ist.The object is achieved in a device of the type mentioned Art solved in that the press device is designed as a wide nip press.

Mit dieser Ausgestaltung erreicht man, daß die Papierbahn nicht mehr in einem relativ schmalen Nip zwischen zwei einander gegenüberliegenden Walzen mit Druck beaufschlagt wird, also sozusagen mit einem Druckstoß. Bei ansonsten unveränderten Parametern, wie Geschwindigkeit und Anpreßkraft, wird die Verweilzeit der Papierbahn im Breitnip erhöht und dafür die Flächenpressung oder Druckspannung verringert.With this configuration, it is achieved that the paper web no longer in a relatively narrow nip between pressurized two opposing rollers with a pressure surge, so to speak. With otherwise unchanged parameters, such as speed and contact pressure, the dwell time of the paper web increased in the wide nip and therefore the surface pressure or compressive stress reduced.

Vorzugsweise weist die Breitnippresse eine harte Walze und einen umlaufenden Mantel sowie einen an die Krümmung der harten Walze angepaßten Stützschuh auf, der den Mantel gegen die Walze drückt, wobei zwischen der Walze und dem Mantel ein Nip ausgebildet ist. Der Stützschuh weist eine der Walze gegenüberliegende konvexe Oberfläche auf, so daß der Mantel, der zu diesem Zweck eine gewisse Flexibilität haben muß, über einen relativ großen Abschnitt des Umfangs an der Walze zur Anlage gebracht wird, verglichen mit einem Nip, der zwischen zwei Walzen gebildet ist. Eine derartige "Schuhpresse" ist zwar aus einigen Bereichen der Papiermaschine bekannt. Sie wird hauptsächlich zur Trocknung der Papierbahn verwendet. Im vorliegenden Fall dient sie allerdings dazu, den Auftrag des Leimes zu vergleichmäßigen und den Leim in der Papierbahn besser wirken zu lassen.The broad nip press preferably has a hard roller and a circumferential coat and one on the curvature support shoe adapted to the hard roller, the presses the jacket against the roller, between the Roller and the jacket a nip is formed. The Support shoe has a convex opposite the roller Surface on, so that the coat leading to this Must have some flexibility about one purpose relatively large portion of the circumference on the roller Plant is compared to a nip that is brought is formed between two rollers. Such "Shoe press" is from some areas of the paper machine known. It mainly becomes Drying the paper web used. In the present In this case, however, it serves to apply the glue to even out and the glue in the paper web better let it work.

Bevorzugterweise weist die Breitnippresse eine Temperiereinrichtung auf. Mit der Temperiereinrichtung ist es möglich, die Papierbahn im Breitnip zu erwärmen, um beispielsweise die Reaktion des Leimes im Breitnip zu beschleunigen.The wide nip press preferably has a temperature control device on. With the temperature control device it is possible to heat the paper web in the wide nip to for example the reaction of the glue in the wide nip accelerate.

Vorzugsweise ist die Leimauftragseinrichtung unmittelbar vor der Breitnippresse angeordnet. Der Leim wird also unmittelbar nach dem Auftragen in die Papierbahn hineingedrückt. Er hat damit keine Gelegenheit, vor dem Eintreten in den Breitnip auszuhärten oder in störendem Maße chemisch mit dem Luftsauerstoff zu reagieren.The glue application device is preferably direct arranged in front of the Breitnippresse. The glue will that is, immediately after application to the paper web pushed. He has no opportunity before Entering into the wide nip to harden or in annoying Measures to react chemically with the atmospheric oxygen.

Vorzugsweise ist die Breitnippresse inmitten einer Trockenpartie einer Papiermaschine angeordnet. Die Papierbahn ist also noch nicht vollständig getrocknet, sondern weist eine vorbestimmte Feuchtigkeit auf. Diese Feuchtigkeit erleichtert dem Leim das Vordringen in das Innere der Papierbahn, so daß nicht nur die Oberfläche, sondern auch darunterliegende Bereiche der Papierbahn verfestigt werden können.The Breitnippresse is preferably in the middle of a Drying section of a paper machine arranged. The paper web is not yet completely dry, but has a predetermined humidity. This Moisture makes it easier for the glue to penetrate into it Inside of the paper web so that not only the surface, but also underlying areas of the paper web can be solidified.

Vorzugsweise sind der Mantel und die Walze als Flüssigkeitssperre ausgebildet. Damit wird verhindert, daß der Leim, der in der Regel flüssig oder mit Hilfe einer Flüssigkeit aufgetragen wird, im Breitnip entweichen kann. Wie oben ausgeführt, dient die Breitnippresse also nicht dazu, die Bahn zu trocknen. Es kann sogar vorkommen, daß durch den Leimauftrag die Feuchtigkeit der Papierbahn zumindest kurzzeitig erhöht wird.The jacket and the roller are preferably used as a liquid barrier educated. This prevents the Glue that is usually liquid or with the help of a Liquid is applied, escape in the wide nip can. As stated above, the broad nip press serves not to dry the web. It can even happen that through the application of glue the moisture of the Paper web is increased at least briefly.

Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung näher beschrieben. Hierin zeigt die

einzige Fig.
eine schematische Darstellung eines Ausschnitts aus einer Vorrichtung zum Herstellen einer Papierbahn.
The invention is described below with reference to a preferred embodiment in connection with the drawing. Here shows the
only fig.
is a schematic representation of a section of a device for producing a paper web.

Eine Papierbahn 1 verläßt einen ersten nur schematisch dargestellten Abschnitt 2 einer Trockenpartie, der im ersten Drittel der Trockenpartie angeordnet ist. Die Papierbahn 1 durchläuft dann eine Leimauftragseinrichtung 3, in der ein Leim 4 in flüssiger Form auf die Papierbahn 1 aufgetragen wird. Andere Formen des Leimauftrags, etwa durch Rakel oder durch Walzen, die in eine Flüssigkeit eintauchen, sind ebenfalls denkbar.A paper web 1 leaves the first only schematically illustrated section 2 of a dryer section, the in first third of the dryer section is arranged. The Paper web 1 then passes through a glue application device 3, in which a glue 4 in liquid form on the paper web 1 is applied. Other forms of glue application, such as by squeegee or by rolling into a Immerse liquid are also conceivable.

Die Papierbahn 1 durchläuft dann eine Breitnippresse 5, die gebildet ist durch eine Walze 6, die als harte Walze ausgebildet ist, und einen Mantel 7, der mit Hilfe eines Stützschuhs 8 über eine Länge im Bereich von 70 bis 250 mm an die Walze 6 angepreßt wird. Der Stützschuh 8 hat eine konkav ausgebildete Stützfläche 9, deren Krümmung im wesentlichen der Krümmung der Walze 6 angepaßt ist, so daß der Mantel 7 über einen relativ großen Winkelbereich an den Umfang der Walze 6 angepreßt wird und dadurch einen entsprechend breiten Nip 10 mit der Walze 6 bildet. Die Berührungsfläche zwischen dem Mantel 7 und dem Stützschuh 8 ist hydraulisch geschmiert. Der Mantel 7 ist aus einem gut verformbaren Kunststoff gebildet. Der Mantel 7, der im übrigen über nicht näher dargestellte Stütz- und Halteelemente geführt werden kann, ist ausreichend flexibel, um in der dargestellten Art und Weise verformt zu werden.The paper web 1 then runs through a wide nip press 5, which is formed by a roller 6, the hard roller is formed, and a coat 7, which with the help a support shoe 8 over a length in the range of 70 up to 250 mm is pressed against the roller 6. The support shoe 8 has a concave support surface 9, the Curvature essentially the curvature of the roller 6 is adjusted so that the jacket 7 over a relative large angular range pressed against the circumference of the roller 6 and thus a correspondingly wide nip 10 forms with the roller 6. The interface between the jacket 7 and the support shoe 8 is hydraulic lubricated. The jacket 7 is made of a well deformable Plastic formed. The coat 7, the rest of the Support and holding elements not shown performed is sufficiently flexible to be in the shown way to be deformed.

Nach dem Durchlaufen der Breitnippresse 5 tritt die Papierbahn 1 in einen weiteren Abschnitt 11 der Trockenpartie der Papiermaschine ein. Schematisch dargestellt sind Leitwalzen 12, 13, über die die Papierbahn geführt wird.After passing through the wide nip press 5, the paper web occurs 1 in a further section 11 of the dryer section the paper machine. Shown schematically are guide rollers 12, 13 over which the paper web is guided becomes.

An der Walze 6 liegt ein Schaber 14 an, mit dem die Walze 6 im Betrieb laufend gereinigt werden kann.On the roller 6 is a scraper 14 with which the Roller 6 can be cleaned continuously during operation.

Die Leimauftragseinrichtung 3 ist unmittelbar vor dem Nip 10 angeordnet. Der in der Zeichnung dargestellte Abstand ist hierbei nicht maßstäblich zu verstehen. Der Leimauftrag erfolgt so kurz vor dem Eintritt in den Nip 10, daß der Leim noch keine Zeit gehabt hat, sich zu verfestigen oder zu verändern. Damit erfolgt nahezu die gesamte Reaktion des Leimes mit der Papierbahn 1 im Nip 10, d.h. dem Breitnip. Die Verweilzeit der Papierbahn im Nip 10 ist aufgrund der Länge dieses Nips außerordentlich hoch. Dies gilt auch bei höheren Geschwindigkeiten der Papierbahn 1. Dafür ist der Flächendruck, d.h. die Druckspannung, gegenüber einem durch zwei Walzen gebildeten Nip relativ gering.The glue application device 3 is immediately before Nip 10 arranged. The one shown in the drawing The distance is not to be understood to scale. The Glue is applied just before entering the nip 10 that the glue has not had time to close solidify or change. This almost takes place overall reaction of the glue with paper web 1 in the nip 10, i.e. the Breitnip. The dwell time of the paper web in the nip 10 is extraordinary due to the length of this nip high. This also applies at higher speeds the paper web 1. For this is the surface pressure, i.e. the compressive stress, versus one by two rollers formed nip relatively low.

Die Walze 6 und der Mantel 7 sind flüssigkeitsundurchlässig ausgebildet, d.h. die Papierbahn 1 wird in dem Nip praktisch nicht getrocknet. Es wird also keine Flüssigkeit herausgepreßt. Der Leim 4 wird vielmehr in die Papierbahn 1 hineingedrückt. Auch wenn er möglicherweise nicht die gesamte Papierbahn 1 durchdringt, führt er doch zu einer merklichen Verfestigung der Oberfläche.The roller 6 and the jacket 7 are impermeable to liquids trained, i.e. the paper web 1 is in the Nip practically not dried. So it won't be Liquid squeezed out. The glue 4 is rather in the paper web 1 pressed in. Even if he may does not penetrate the entire paper web 1, it leads to a noticeable solidification of the Surface.

Die Walze 6 kann beheizt sein, so daß die Reaktionszeit des Leimes 4 mit der Papierbahn 1 verkürzt werden kann.The roller 6 can be heated so that the reaction time the glue 4 can be shortened with the paper web 1.

Die Verweilzeit der Papierbahn 1 im Nip 10 ist so groß, daß der Leim 4 in der Papierbahn 1 weitgehend abgebunden hat, wenn die Papierbahn 1 den Nip 10 wieder verläßt.The dwell time of the paper web 1 in the nip 10 is so long that the glue 4 in the paper web 1 largely set has when the paper web 1 leaves the nip 10 again.

Die Papierbahn 1 hat nach dem Verlassen des ersten Abschnitts 2 der Trockenpartie noch eine Feuchte von 90 bis 97 %. Dieser Feuchtigkeitsgehalt führt in Verbindung mit dem breiten Nip 10 dazu, daß sich der Leim 4 sehr gleichmäßig auf der Papierbahn 1 verteilt. Etwaige Ungleichmäßigkeiten beim Leimauftrag werden im breiten Nip 10 relativ weitgehend wieder ausgeglichen.The paper web 1 has after leaving the first section 2 of the dryer section still a moisture of 90 up to 97%. This moisture content is related with the wide nip 10 so that the glue 4 distributed very evenly on the paper web 1. any Irregularities in the application of glue become broad Nip 10 fairly balanced again.

Neben der Verfestigung der Oberfläche der Papierbahn erfolgt als Nebeneffekt auch eine verbesserte Glätte der Oberfläche der Papierbahn 1.In addition to solidifying the surface of the paper web As a side effect, there is also an improved smoothness the surface of the paper web 1.

Claims (11)

Verfahren zum Herstellen einer Papierbahn, bei dem eine Leimbeschichtung auf die Papierbahn aufgetragen und die Papierbahn danach durch eine Presseneinrichtung geleitet wird, dadurch gekennzeichnet, daß man die Papierbahn nach dem Leimauftrag durch einen Breitnip leitet.A process for producing a paper web, in which a glue coating is applied to the paper web and the paper web is then passed through a press device, characterized in that the paper web is passed through a wide nip after the glue application. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Papierbahn im Breitnip beheizt.A method according to claim 1, characterized in that the paper web is heated in the wide nip. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man die Leimbeschichtung unmittelbar vor dem Breitnip aufträgt.A method according to claim 1 or 2, characterized in that the glue coating is applied immediately before the wide nip. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man die Papierbahn im Breitnip zwischen zwei geschlossenen, wasserundurchlässigen Oberflächen einschließt. Method according to one of claims 1 to 3, characterized in that the paper web is enclosed in the wide nip between two closed, water-impermeable surfaces. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man die Papierbahn im noch feuchten Zustand mit Leim versieht.Method according to one of claims 1 to 4, characterized in that the paper web is provided with glue while still moist. Vorrichtung zum Herstellen einer Papierbahn mit einer Leimauftragseinrichtung und eine Presseneinrichtung, dadurch gekennzeichnet, daß die Presseneinrichtung als Breitnippresse (5) ausgebildet ist.Device for producing a paper web with a glue application device and a press device, characterized in that the press device is designed as a wide nip press (5). Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Breitnippresse (5) eine harte Walze (6) und einen umlaufenden Mantel (7) sowie einen an die Krümmung der harten Walze (6) angepaßten Stützschuh (8) aufweist, der den Mantel (7) gegen die Walze (6) drückt, wobei zwischen der Walze (6) und dem Mantel (7) ein Nip (10) ausgebildet ist.Apparatus according to claim 6, characterized in that the wide nip press (5) has a hard roller (6) and a circumferential jacket (7) and a support shoe (8) which is adapted to the curvature of the hard roller (6) and which has the jacket (7 ) presses against the roller (6), a nip (10) being formed between the roller (6) and the jacket (7). Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Breitnippresse (5) eine Temperiereinrichtung aufweist.Apparatus according to claim 6 or 7, characterized in that the wide nip press (5) has a temperature control device. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Leimauftragseinrichtung (3) unmittelbar vor der Breitnippresse (5) angeordnet ist.Device according to one of claims 6 to 8, characterized in that the glue application device (3) is arranged directly in front of the wide nip press (5). Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß die Breitnippresse (5) inmitten einer Trockenpartie (2, 11) einer Papiermaschine angeordnet ist. Device according to one of claims 6 to 9, characterized in that the wide nip press (5) is arranged in the middle of a dryer section (2, 11) of a paper machine. Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß der Mantel (7) und die Walze (6) als Flüssigkeitssperre ausgebildet sind.Device according to one of claims 7 to 10, characterized in that the jacket (7) and the roller (6) are designed as a liquid barrier.
EP20030000981 2002-02-02 2003-01-17 Process and apparatus for making a paper web Expired - Fee Related EP1333124B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10204285 2002-02-02
DE2002104285 DE10204285C1 (en) 2002-02-02 2002-02-02 For increased paper web strength, web surface is sprayed with glue, and web passes directly through wide nip between hard roller and rotating mantle

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EP1333124A2 true EP1333124A2 (en) 2003-08-06
EP1333124A3 EP1333124A3 (en) 2004-11-03
EP1333124B1 EP1333124B1 (en) 2012-10-17

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Publication number Priority date Publication date Assignee Title
DE10329675A1 (en) * 2003-07-01 2005-02-03 Voith Paper Patent Gmbh Pressing and coating treatment for fibrous web in papermaking plant producing e.g. newsprint, coats chemical agent on wet side of dewatering nip

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Publication number Priority date Publication date Assignee Title
US4287021A (en) * 1979-08-27 1981-09-01 Beloit Corporation Extended nip press
DE3317455A1 (en) * 1983-05-13 1984-11-15 J.M. Voith Gmbh, 7920 Heidenheim PRESSING DEVICE, IN PARTICULAR FOR DRAINING A PAPER RAIL
DE3920204A1 (en) * 1988-10-31 1990-05-10 Escher Wyss Gmbh METHOD FOR SMOOTHING A PAPER OR CARDBOARD SHEET
DE4446308C2 (en) * 1994-12-23 2000-10-26 Voith Sulzer Papiermasch Gmbh Device for applying a liquid or pasty medium to a running web of material
SE9500949L (en) * 1995-03-16 1996-07-08 Korsnaes Ab Coated cardboard for shaped articles, production line for production of coated cardboard, method for making coated cardboard and ways to reduce the cracking propensity when folding a coated cardboard
DE19715345A1 (en) * 1997-03-27 1998-10-01 Voith Sulzer Papiermasch Gmbh Process for producing a coated web, in particular from paper or cardboard
US6287424B1 (en) * 1998-09-22 2001-09-11 International Paper Company Method for finishing paperboard to achieve improved smoothness

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EP1333124A3 (en) 2004-11-03
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