EP0735188A1 - Process and apparatus for making a paper sheet having a CF-coat applied thereon - Google Patents

Process and apparatus for making a paper sheet having a CF-coat applied thereon Download PDF

Info

Publication number
EP0735188A1
EP0735188A1 EP96102320A EP96102320A EP0735188A1 EP 0735188 A1 EP0735188 A1 EP 0735188A1 EP 96102320 A EP96102320 A EP 96102320A EP 96102320 A EP96102320 A EP 96102320A EP 0735188 A1 EP0735188 A1 EP 0735188A1
Authority
EP
European Patent Office
Prior art keywords
coating
roller
roll
web
paper
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.)
Withdrawn
Application number
EP96102320A
Other languages
German (de)
French (fr)
Inventor
Rüdiger Dr. Kurtz
Martin Kustermann
Michael Trefz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0735188A1 publication Critical patent/EP0735188A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work

Definitions

  • the invention relates to a method for producing a paper web which has a so-called CF layer, in particular with the features specified in the preamble of claim 1.
  • the invention also relates to an apparatus for performing this method.
  • a CF layer (applied to paper) contains a color-reactive pigment that interacts with a so-called CB layer of another paper (e.g. in a set of forms) in such a way that visible signs are created when pressure is applied (e.g. when copying).
  • the nip is set to a distance "not less than the thickness of the uncoated paper".
  • a line force of 10-40 kN / m is set between the two rollers.
  • the CF layer to be applied is pressed too hard into the paper (into the cavities between the paper fibers).
  • the penetration of the coating slip into the paper is too high. Consequently, a higher and thus relatively expensive ink application is required in order to ensure the desired "copy intensity" later when using the coated paper.
  • the uniformity of the CF layer also leaves something to be desired; sometimes an orange peel-like surface is created, which impairs the utility. For example, the printability of the paper side having the CF layer is reduced.
  • the invention is therefore based on the object of further developing the method specified in the preamble of claim 1 in such a way that the finished paper web having a CF layer meets higher quality requirements than hitherto.
  • the device specified in the preamble of claim 3 is to be further developed.
  • the object is achieved by the characterizing method feature of claim 1 or by the characterizing device feature of claim 3.
  • Particularly advantageous embodiments of the invention can consist in that a certain length of the nip is ensured according to the subclaims; i.e. the paper web comes into contact with both roller shells simultaneously in the nip over a certain running distance.
  • the specific surface pressure can be kept at particularly low values. This is especially true when one of the two rollers is designed as a shoe press roller; because in this case, the contact pressure is known to be distributed over a particularly large area. Similar to known shoe press rolls (from paper making machines), a particularly sensitive and gradual increase in the contact pressure can be ensured when the paper web and the CF layer to be applied enter the roll nip. At the same time, it is possible to ensure a relatively rapid, steep drop in pressure when leaving the nip. This further increases the uniformity (in other words: the smoothness) of the surface of the CF layer. The previously feared orange peel effect is almost completely avoided.
  • FIGS. 1 to 4 shows a device according to the invention for producing a CF layer, in each case in a schematic side view.
  • a coating roller 2 and a counter roller 1 together form a nip through which a paper web 3 to be coated runs.
  • a feed and metering device for CF coating ink is arranged in the free area of the outer surface of the coating roller 2.
  • This device comprises in a known manner a nozzle-like feed channel 9 and as a metering element a doctor blade 11, which is preferably provided with circumferential grooves. This device creates a thin coating film on the roll shell of the coating roll from the supplied CF coating ink, which film is then transferred to the paper web in the nip.
  • one of the two rollers preferably the counter roller 1 rests in immovable bearings.
  • the bearings of the other roller that is preferably the coating roller 2 are movable; i.e. they rest, for example, in swivel levers 4, which can be actuated by means of a loading device (e.g. hydraulic cylinder 13).
  • the hydraulic cylinder presses the two rollers 1 and 2 against each other. It is counteracted by an energy accumulator, e.g. a compression spring 14.
  • an energy accumulator e.g. a compression spring 14.
  • the other side of the paper web 3 (the bottom side according to FIG. 1) can remain unchanged when the CF layer is applied to the top side.
  • any medium for example water or starch or any coating color (for example a CB coating color) can be used by means of an additional application roller 15 which works together with an additional feed and metering device 16. are applied to the counter roller 1, which then transfers this medium to the underside of the paper web 3.
  • the peripheral speed v 1 of the additional coating roller is lower than the working speed v of the entire device. In this way, a particularly fine metering of the medium to be applied is achieved.
  • FIG. 2 differs from FIG. 1 essentially only in that a shoe press roll 1 'is provided instead of a normal counter roll.
  • This has a circumferential flexible press jacket 1a through which a stationary support body 7 extends.
  • a radially movable press shoe 5 has a concave (and adapted to the coating roller 2) sliding surface for the press jacket 1a. It is guided in the support body 7 and can press the press cover 1a sensitively onto the coating roller 2.
  • a stationary slide shoe 8 with a convex slide surface is provided on the support body 7.
  • an additional feed and metering device 16 can be provided on the outside of the press casing 1a in order to apply any medium to the other paper side via the press casing 1a.
  • FIGS. 1 and 2 the paper web essentially runs through the nip from top to bottom.
  • FIGS. 3 and 4 show.
  • Feed and metering devices CF or 16 or 16 ' are used here. These are designed so constructively that they can be arranged on the downward-facing side of the roll shell in question.
  • the feed and metering device 16 'provided on the counter roll 1 in FIG. 3 forms, together with the roll shell, a liquid sump, while the other feed and metering devices CF and 16 avoid such a sump and are therefore suitable for higher working speeds.
  • the CF coating color (and / or possibly the medium to be applied to the opposite side) can be supplied to the relevant roller 2 or 1 by means of a free jet nozzle known per se. If necessary, excess CF coating color (or excess medium) can then be scraped off the roller.

Abstract

In a process for the mfr. of paper having a CF coating on one side, the raw paper is passed through the gap between a coating roll (2) and an opposing roll (1). The CF coating material, which contains a mineral or organic colour reactive pigment, is continuously applied to the coating roll - at a thickness determined by a metering roll (14) - and is applied by the coating roll to the paper. The coating and opposing rolls (2, 1) are pressed against one another in such a way that an average linear force of a max. of 10 N/m is exerted between them. Also claimed is a coating machine for the process in which the coating and opposing rolls are provided with a means of sensitively generating a linear force between them in the region of up to 10 kN/m.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Papierbahn, die eine sogenannte CF-Schicht aufweist, im einzelnen mit den im Oberbegriff des Anspruches 1 angegebenen Merkmalen. Die Erfindung betrifft außerdem eine Vorrichtung zur Durchführung dieses Verfahrens. Bekanntlich enthält eine (auf Papier aufgetragene) CF-Schicht ein farbreaktives Pigment, das mit einer sogenannten CB-Schicht eines anderen Papiers (z.B. in einem Formularsatz) derart zusammenwirkt, daß unter Druckeinwirkung (z.B. beim Durchschreiben) sichtbare Zeichen entstehen.The invention relates to a method for producing a paper web which has a so-called CF layer, in particular with the features specified in the preamble of claim 1. The invention also relates to an apparatus for performing this method. As is known, a CF layer (applied to paper) contains a color-reactive pigment that interacts with a so-called CB layer of another paper (e.g. in a set of forms) in such a way that visible signs are created when pressure is applied (e.g. when copying).

Zum Stand der Technik wird hingewiesen auf die DE 4224716 C2 und die DE 4224719 C2 sowie auf die dort angegebene Literatur. Bei jedem der bekannten Verfahren werden unterschiedliche Methoden angewandt zur Einstellung von zwei Walzen, die einen Walzenspalt bilden, durch den eine zu beschichtende Papierbahn hindurchläuft.With regard to the prior art, reference is made to DE 4224716 C2 and DE 4224719 C2 and to the literature cited there. In each of the known methods, different methods are used to set two rollers which form a nip through which a paper web to be coated passes.

Bei der einen Methode wird der Walzenspalt auf einen Abstand eingestellt, der "nicht kleiner als die Dicke des ungestrichenen Papiers ist". Bei dieser bekannten Methode ist zu erwarten, daß es sehr schwierig oder gar unmöglich ist, die Streichmasse mit der notwendigen Gleichmäßigkeit auf die Papierbahn-Oberfläche zu übertragen. Es ist nämlich sehr schwierig, den Walzenspalt über die gesamte Bahnbreite hinweg (die viele Meter betragen kann, max. ca. 10 m) exakt gleich einzustellen. So kann beispielsweise durch unterschiedliche Temperaturen und hierdurch verursachte örtliche Durchmesser-Veränderungen der Abstand zwischen den zwei Walzenmänteln unterschiedlich sein.In one method, the nip is set to a distance "not less than the thickness of the uncoated paper". With this known method it can be expected that it is very difficult or even impossible to transfer the coating slip onto the paper web surface with the necessary uniformity. It is very difficult to set the roller gap exactly the same across the entire web width (which can be many meters, max. Approx. 10 m). For example, the distance between the two roller shells can be different due to different temperatures and the resulting local changes in diameter.

Bei einer anderen Methode wird zwischen den zwei Walzen eine Linienkraft von 10-40 kN/m eingestellt. Hierbei besteht die Gefahr, daß die aufzutragende CF-Schicht zu stark in das Papier (in die Hohlräume zwischen den Papierfasern) hineingedrückt wird. Mit anderen Worten: die Penetration der Streichmasse in das Papier ist zu hoch. Folglich ist ein höherer und somit relativ teurer Farbauftrag erforderlich, um später beim Gebrauch des beschichteten Papiers die gewünschte "Durchschrift-Intensität" sicherzustellen. Auch die Gleichmässigkeit der CF-Schicht läßt zu wünschen übrig; es entsteht mitunter eine orangenschalen-artige Oberfläche, die den Gebrauchsnutzen beeinträchtigt. Beispielsweise wird die Bedruckbarkeit der die CF-Schicht aufweisenden Papierseite vermindert.In another method, a line force of 10-40 kN / m is set between the two rollers. There is a risk here that the CF layer to be applied is pressed too hard into the paper (into the cavities between the paper fibers). In other words, the penetration of the coating slip into the paper is too high. Consequently, a higher and thus relatively expensive ink application is required in order to ensure the desired "copy intensity" later when using the coated paper. The uniformity of the CF layer also leaves something to be desired; sometimes an orange peel-like surface is created, which impairs the utility. For example, the printability of the paper side having the CF layer is reduced.

Der Erfindung liegt deshalb die Aufgabe zugrunde, das im Oberbegriff des Anspruches 1 angegebene Verfahren dahingehend weiterzuentwickeln, daß die fertige, eine CF-Schicht aufweisende Papierbahn höheren Qualitätsansprüchen genügt als bisher. In gleicher Weise soll die im Oberbegriff des Anspruches 3 angegebene Vorrichtung weiterentwickelt werden.The invention is therefore based on the object of further developing the method specified in the preamble of claim 1 in such a way that the finished paper web having a CF layer meets higher quality requirements than hitherto. In the same way, the device specified in the preamble of claim 3 is to be further developed.

Die gestellte Aufgabe wird durch das kennzeichnende Verfahrensmerkmal des Anspruches 1 bzw. durch das kennzeichnende Vorrichtungsmerkmal des Anspruches 3 gelöst.The object is achieved by the characterizing method feature of claim 1 or by the characterizing device feature of claim 3.

Vorteile der Erfindung: Es wurde erkannt, daß optimale Ergebnisse hinsichtlich der Qualität der CF-Schicht gerade im Linienkraft-Bereich zwischen Null und 10 kN/m erzielt werden können. Insbesondere wird durch die Anwendung der relativ geringen Linienkraft dafür gesorgt, daß der Pigment-Anteil der CF-Streichmasse eine sehr gleichmäßige und geschlossene Schicht bildet, ohne daß eine übermäßig hohe Menge an CF-Streichfarbe zugeführt werden muß. Dies trägt wesentlich zur Verringerung der Herstellungskosten bei. Des weiteren wurde erkannt, daß dank der relativ geringen Linienkraft auch der flüssige Bindemittelanteil der CF-Streichfarbe weniger in das Papier penetriert. Dadurch verbleibt ein größerer Anteil des Bindemittels in der CF-Schicht. Daraus resultiert beim Bedrukken der CF-Schicht des fertigen Papiers der unerwartete Vorteil, daß bisherige unerwünschte Begleiterscheinigungen wie Staubbildung oder Verkleben des Druckmittels weitgehend vermieden werden.Advantages of the invention: It was recognized that optimal results with regard to the quality of the CF layer can be achieved precisely in the line force range between zero and 10 kN / m. In particular, the use of the relatively low line force ensures that the pigment portion of the CF coating slip forms a very uniform and closed layer without an excessively high amount of CF coating slip having to be added. This contributes significantly to reducing manufacturing costs. Furthermore was recognized that thanks to the relatively low line force, the liquid binder component of the CF coating color also penetrates less into the paper. As a result, a larger proportion of the binder remains in the CF layer. This results in the unexpected advantage when printing the CF layer of the finished paper that previous undesirable side effects such as dust formation or sticking of the pressure medium are largely avoided.

Besonders vorteilhafte Ausgestaltungen der Erfindung können darin bestehen, daß gemäß den Unteransprüchen für eine bestimmte Länge des Walzenspaltes gesorgt wird; d.h. die Papierbahn kommt im Walzenspalt über eine gewisse Laufstrecke gleichzeitig mit beiden Walzenmänteln in Kontakt. Dabei kann die spezifische Flächenpressung auf besonders niedrigen Werten gehalten werden. Dies gilt besonders auch dann, wenn eine der beiden Walzen als Schuhpreßwalze ausgebildet ist; denn in diesem Fall wird bekanntlich die Anpreßkraft auf eine besonders große Fläche aufgeteilt. Ähnlich wie bei (von Papierherstellungsmaschinen) bekannten Schuhpreßwalzen, kann beim Einlauf der Papierbahn und der aufzutragenden CF-Schicht in den Walzenspalt für ein besonders feinfühliges und allmähliches Ansteigen des Anpreßdruckes gesorgt werden. Zugleich ist es möglich, beim Auslauf aus dem Walzenspalt für einen relativ raschen, steilen Druckabfall zu sorgen. Dadurch wird die Gleichmäßigkeit (mit anderen Worten: die Glätte) der Oberfläche der CF-Schicht noch weiter erhöht. Der bisher gefürchtete Orangenschalen-Effekt wird hierdurch so gut wie vollkommen vermieden.Particularly advantageous embodiments of the invention can consist in that a certain length of the nip is ensured according to the subclaims; i.e. the paper web comes into contact with both roller shells simultaneously in the nip over a certain running distance. The specific surface pressure can be kept at particularly low values. This is especially true when one of the two rollers is designed as a shoe press roller; because in this case, the contact pressure is known to be distributed over a particularly large area. Similar to known shoe press rolls (from paper making machines), a particularly sensitive and gradual increase in the contact pressure can be ensured when the paper web and the CF layer to be applied enter the roll nip. At the same time, it is possible to ensure a relatively rapid, steep drop in pressure when leaving the nip. This further increases the uniformity (in other words: the smoothness) of the surface of the CF layer. The previously feared orange peel effect is almost completely avoided.

Das Einstellen der sehr kleinen Linienkraft zwischen Null und 10 kN/m ist mit den herkömmlichen Anpreßeinrichtungen nur schwer oder gar nicht erreichbar. Möglich ist dies jedoch mit einer speziellen Weiterbildung gemäß Anspruch 4.Setting the very small line force between zero and 10 kN / m is difficult or impossible to achieve with the conventional pressure devices. However, this is possible with a special training according to claim 4.

Jede der Figuren 1 bis 4 zeigt eine erfindungsgemäße, zum Herstellen einer CF-Schicht dienende Vorrichtung, jeweils in einer schematischen Seitenansicht.Each of FIGS. 1 to 4 shows a device according to the invention for producing a CF layer, in each case in a schematic side view.

In Fig. 1 ist folgendes vorgesehen: Eine Beschichtungswalze 2 und eine Gegenwalze 1 bilden miteinander einen Walzenspalt, durch den eine zu beschichtende Papierbahn 3 hindurchläuft. Im freiem Bereich der Mantelfläche der Beschichtungswalze 2 ist eine insgesamt mit CF bezeichnete Zuführ- und Dosiereinrichtung für CF-Streichfarbe angeordnet. Diese Einrichtung umfaßt in bekannter Weise einen düsenartigen Zuführkanal 9 und als Dosierelement eine Rollrakel 11, die vorzugsweise mit Umfangsrillen versehen ist. Diese Einrichtung erzeug auf dem Walzenmantel der Beschichtungswalze aus der zugeführten CF-Streichfarbe einen dünnen Streichfarbe-Film, der sodann im Walzenspalt auf die Papierbahn übertragen wird.The following is provided in FIG. 1: A coating roller 2 and a counter roller 1 together form a nip through which a paper web 3 to be coated runs. In the free area of the outer surface of the coating roller 2, a feed and metering device for CF coating ink, generally designated CF, is arranged. This device comprises in a known manner a nozzle-like feed channel 9 and as a metering element a doctor blade 11, which is preferably provided with circumferential grooves. This device creates a thin coating film on the roll shell of the coating roll from the supplied CF coating ink, which film is then transferred to the paper web in the nip.

Schematisch ist angedeutet, daß die eine der beiden Walzen, vorzugsweise die Gegenwalze 1, in unbeweglichen Lagern ruht. Dagegen sind die Lager der anderen Walze, also vorzugsweise der Beschichtungswalze 2, beweglich; d.h. sie ruhen beispielsweise in Schwenkhebeln 4, die mittels je einer Belastungseinrichtung (z.B. Hydraulikzylinder 13) betätigbar sind. Der Hydraulikzylinder bewirkt ein gegenseitiges Anpressen der beiden Walzen 1 und 2. Ihm wirkt entgegen ein Kraftspeicher, z.B. eine Druckfeder 14. Dadurch kann die im Walzenspalt wirkende Anpreßkraft sehr feinfühlig auf extrem niedrige Werte eingestellt werden.It is indicated schematically that one of the two rollers, preferably the counter roller 1, rests in immovable bearings. In contrast, the bearings of the other roller, that is preferably the coating roller 2, are movable; i.e. they rest, for example, in swivel levers 4, which can be actuated by means of a loading device (e.g. hydraulic cylinder 13). The hydraulic cylinder presses the two rollers 1 and 2 against each other. It is counteracted by an energy accumulator, e.g. a compression spring 14. As a result, the contact pressure acting in the nip can be set very sensitively to extremely low values.

Man wählt die Durchmesser der beiden Walzen 1 und 2 und die Werkstoffe, E-Modul und Härte der Walzenmäntel bzw. der Walzenbezüge sowie die Höhe der im Walzenspalt wirkenden Linienkraft derart, daß - in Laufrichtung gemessen - die Länge a des Walzenspaltes mindestens 5 mm beträgt, vorzugsweise zwischen 10 und 20 mm.One chooses the diameter of the two rolls 1 and 2 and the materials, modulus of elasticity and hardness of the roll shells or the roll covers as well as the height of the line force acting in the roll gap such that - measured in the running direction - the length a of the roll gap is at least 5 mm , preferably between 10 and 20 mm.

Die andere Seite der Papierbahn 3 (gemäß Fig. 1 die Unterseite) kann beim Auftragen der CF-Schicht auf die Oberseite unverändert bleiben. Alternativ hierzu kann - wie in Fig. 1 schematisch angedeutet - mittels einer zusätzlichen Auftragswalze 15, die mit einer zusätzlichen Zuführ- und Dosiereinrichtung 16 zusammenarbeitet, irgend ein Medium, z.B. Wasser, oder Stärke oder eine beliebige Streichfarbe, (beispielsweise eine CB-Streichfarbe) auf die Gegenwalze 1 aufgetragen werden, welche dieses Medium sodann auf die Unterseite der Papierbahn 3 überträgt. In der Figur 1 ist angedeutet, daß die Umfangsgeschwindigkeit v1 der zusätzlichen Beschichtungswalze kleiner ist als die Arbeitsgeschwindigkeit v der gesamten Vorrichtung. Hierdurch wird eine besonders feine Dosierung des aufzutragenden Mediums erreicht.The other side of the paper web 3 (the bottom side according to FIG. 1) can remain unchanged when the CF layer is applied to the top side. As an alternative to this - as indicated schematically in FIG. 1 - any medium, for example water or starch or any coating color (for example a CB coating color) can be used by means of an additional application roller 15 which works together with an additional feed and metering device 16. are applied to the counter roller 1, which then transfers this medium to the underside of the paper web 3. In FIG. 1 it is indicated that the peripheral speed v 1 of the additional coating roller is lower than the working speed v of the entire device. In this way, a particularly fine metering of the medium to be applied is achieved.

Das Ausführungsbeispiel gemäß Figur 2 unterscheidet sich von Figur 1 im wesentlichen nur dadurch, daß anstelle einer normalen Gegenwalze eine Schuhpreßwalze 1' vorgesehen ist. Diese hat einen umlaufenden flexiblen Preßmantel 1a, durch den sich ein stationärer Tragkörper 7 erstreckt. Ein radial beweglicher Preßschuh 5 hat für den Preßmantel 1a eine konkave (und an die Beschichtungswalze 2 angepaßte) Gleitfläche. Er ist in dem Tragkörper 7 geführt und kann den Preßmantel 1a feinfühlig an die Beschichtungswalze 2 anpressen. Gegenüber dem beweglichen Preßschuh 5 ist am Tragkörper 7 ein stationärer Gleitschuh 8 mit einer konvexen Gleitfläche vorgesehen. Hier kann an der Außenseite des Preßmantels 1a eine zusätzliche Zuführ- und Dosiereinrichtung 16 vorgesehen werden, um irgendein Medium über den Preßmantel 1a auf die andere Papierseite aufzutragen.The exemplary embodiment according to FIG. 2 differs from FIG. 1 essentially only in that a shoe press roll 1 'is provided instead of a normal counter roll. This has a circumferential flexible press jacket 1a through which a stationary support body 7 extends. A radially movable press shoe 5 has a concave (and adapted to the coating roller 2) sliding surface for the press jacket 1a. It is guided in the support body 7 and can press the press cover 1a sensitively onto the coating roller 2. Compared to the movable press shoe 5, a stationary slide shoe 8 with a convex slide surface is provided on the support body 7. Here, an additional feed and metering device 16 can be provided on the outside of the press casing 1a in order to apply any medium to the other paper side via the press casing 1a.

Gemäß den Figuren 1 und 2 läuft die Papierbahn im wesentlichen von oben nach unten durch den Walzenspalt hindurch. Das umgekehrte ist jedoch ebenfalls möglich, wie die Figuren 3 und 4 zeigen. Man verwendet hierbei Zuführ- und Dosiereinrichtungen CF bzw. 16 oder 16'. Diese sind derart konstruktiv gestaltet, daß sie an der nach unten laufenden Seite des betreffenden Walzenmantels angeordnet werden können. Die an der Gegenwalze 1 der Figur 3 vorgesehene Zuführ- und Dosiereinrichtung 16' bildet zusammen mit dem Walzenmantel einen Flüssigkeitssumpf, während die anderen Zuführ- und Dosiereinrichtungen CF bzw. 16 einen solchen Sumpf vermeiden und deshalb für höhere Arbeitsgeschwindigkeiten geeignet sind.According to FIGS. 1 and 2, the paper web essentially runs through the nip from top to bottom. The reverse is also possible, however, as FIGS. 3 and 4 show. Feed and metering devices CF or 16 or 16 'are used here. These are designed so constructively that they can be arranged on the downward-facing side of the roll shell in question. The feed and metering device 16 'provided on the counter roll 1 in FIG. 3 forms, together with the roll shell, a liquid sump, while the other feed and metering devices CF and 16 avoid such a sump and are therefore suitable for higher working speeds.

Abweichend von den Figuren 1-4 könnte folgendes vorgesehen werden: Die CF-Streichfarbe (und/oder ggf. das auf die Gegenseite aufzutragende Medium) kann mittels einer an sich bekannten Freistrahldüse der betreffenden Walze 2 bzw. 1 zugeführt werden. Danach kann, falls erforderlich, überschüssige CF-Streichfarbe (bzw. überschüssiges Medium) von der Walze abgerakelt werden.Deviating from FIGS. 1-4, the following could be provided: The CF coating color (and / or possibly the medium to be applied to the opposite side) can be supplied to the relevant roller 2 or 1 by means of a free jet nozzle known per se. If necessary, excess CF coating color (or excess medium) can then be scraped off the roller.

Claims (6)

Verfahren zum Herstellen einer Papierbahn, die auf einer Bahnseite eine sogenannte CF-Schicht aufweist, mit den folgenden Verfahrensschritten: a) Die auf einer Papiermaschine hergestellte rohe Papierbahn führt man durch einen von einer Beschichtungswalze (2) und einer Gegenwalze (1) gebildeten Walzenspalt (a); b) CF-Streichfarbe, die ein mineralisches oder organisches farbreaktives Pigment enthält, wird kontinuierlich auf den umlaufenden Walzenmantel der Beschichtungswalze (2) aufgetragen und dort mittels einer Dosiereinrichtung (z.B. Rollrakel 11) dosiert; c) die derart dosierte CF-Streichfarbe wird mittels der rotierenden Beschichtungswalze (2) in dem genannten Walzenspalt auf die Papierbahn (3) übertragen; d) dadurch gekennzeichnet, daß die zwei Walzen (1, 2) mit einer Linienkraft von höchstens 10 kN/m gegeneinander gedrückt werden. Method for producing a paper web which has a so-called CF layer on one side of the web, with the following method steps: a) The raw paper web produced on a paper machine is passed through a nip (a) formed by a coating roller (2) and a counter roller (1); b) CF coating color, which contains a mineral or organic color-reactive pigment, is continuously applied to the circumferential roller jacket of the coating roller (2) and metered there by means of a metering device (eg roller doctor blade 11); c) the CF coating ink metered in this way is transferred to the paper web (3) by means of the rotating coating roller (2) in the said nip; d) characterized in that the two rollers (1, 2) are pressed against each other with a line force of at most 10 kN / m. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Linienkraft - unter Berücksichtigung des Werkstoffes, der Härte und des Elastizitäts-Moduls der Walzenbezüge sowie der Walzen-Durchmesser - derart wählt, daß, in Bahnlaufrichtung gemessen, eine Spaltlänge von mindestens 5 mm vorhanden ist.Method according to Claim 1, characterized in that the line force - taking into account the material, the hardness and the modulus of elasticity of the roll covers and the roll diameter - is selected such that, measured in the direction of web travel, there is a gap length of at least 5 mm . Vorrichtung zur Durchführung des Verfahrens nach einem der vorangehenden Ansprüche, mit einer Beschichtungswalze (2), die mit einer Gegenwalze (1) einen Walzenspalt (a) bildet, mit einer der freien Mantelfläche der Beschichtungswalze zugeordneten Zuführ- und Dosiereinrichtung (10) für CF-Streichfarbe sowie mit einer Einrichtung (13) zum gegenseitigen Anpressen der genannten Walzen,
gekennzeichnet durch Maßnahmen, durch welche die Anpreßeinrichtung (13) zum feinfühligen Einstellen beliebiger Linienkräfte im Bereich bis 10 kN/m geeignet ist.Device for carrying out the method according to one of the preceding claims, with a coating roller (2), which forms a roller gap (a) with a counter roller (1), with a feed and metering device (10) for CF- associated with the free outer surface of the coating roller Coating color and with a device (13) for pressing the rollers mentioned against each other,
characterized by measures by which the pressing device (13) is suitable for the sensitive adjustment of any line forces in the range up to 10 kN / m. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Anpreßeinrichtung einen variablen Krafterzeuger umfaßt, dem ein Kraftspeicher (z.B. Feder, Gegendruck-Zylinder oder dgl.) entgegenwirkt.Apparatus according to claim 3, characterized in that the pressing device comprises a variable force generator which is counteracted by a force accumulator (e.g. spring, counter-pressure cylinder or the like). Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Werkstoff, die Härte und der E-Modul der Walzenbezüge sowie die Walzen-Durchmesser derart gewählt sind, daß unter Anwendung der genannten Linienkraft eine Walzenspalt-Länge (a) von mindestens 5 mm vorhanden ist, gemessen in Bahnlaufrichtung.Apparatus according to claim 3 or 4, characterized in that the material, the hardness and the modulus of elasticity of the roll covers and the roll diameters are chosen such that a roll gap length (a) of at least 5 mm is present using the line force mentioned is measured in the direction of web travel. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß eine der beiden Walzen einen elastisch verformbaren Preßmantel (1a) aufweist, der über einen Preßschuh (5) gleitet, so daß ein in Bahnlaufrichtung verlängerter Walzenspalt vorhanden ist.Apparatus according to claim 3 or 4, characterized in that one of the two rolls has an elastically deformable press jacket (1a) which slides over a press shoe (5) so that a roll nip which is elongated in the web running direction is present.
EP96102320A 1995-03-25 1996-03-01 Process and apparatus for making a paper sheet having a CF-coat applied thereon Withdrawn EP0735188A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19511050 1995-03-25
DE19511050A DE19511050A1 (en) 1995-03-25 1995-03-25 Method and device for producing a paper web having a CF layer

Publications (1)

Publication Number Publication Date
EP0735188A1 true EP0735188A1 (en) 1996-10-02

Family

ID=7757773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102320A Withdrawn EP0735188A1 (en) 1995-03-25 1996-03-01 Process and apparatus for making a paper sheet having a CF-coat applied thereon

Country Status (4)

Country Link
US (1) US5811157A (en)
EP (1) EP0735188A1 (en)
JP (1) JPH08294652A (en)
DE (1) DE19511050A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI111134B (en) * 1997-03-13 2003-06-13 Metso Paper Inc Method and apparatus for preventing vibration of rollers in a film press
US6372090B1 (en) * 1998-08-04 2002-04-16 Valmet Corporation Method and apparatus for handling paper or cardboard webs
WO2000078468A1 (en) * 1999-06-18 2000-12-28 Voith Paper Patent Gmbh Roller provided for use in coating machines
US20040076753A1 (en) * 2002-09-25 2004-04-22 Ballard Power Systems Inc. Impregnation of porous substrates
US20060147636A1 (en) * 2004-12-30 2006-07-06 Cooprider Terrence E Method and apparatus of forming a coating fluid pattern
US7625605B2 (en) * 2004-12-30 2009-12-01 3M Innovative Properties Company Method for coating a surface with a pattern of coating fluid
CN102493280A (en) * 2011-12-02 2012-06-13 牡丹江恒丰纸业股份有限公司 Device and method for manufacturing cigarette paper with flame-retardant belt

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433165A (en) * 1973-09-13 1976-04-22 Wiggins Teape Ltd Coated
US4347269A (en) * 1980-04-08 1982-08-31 The Wiggins Teape Group Limited Method of and apparatus for applying a coating to a web of sheet material
EP0385640A2 (en) * 1989-02-23 1990-09-05 The Wiggins Teape Group Limited Process for applying microcapsule-containing compositions to paper
WO1991015306A1 (en) * 1990-04-03 1991-10-17 Btg Källe Inventing Ab Process for two-faced coating of a travelling web
DE4224719A1 (en) * 1992-07-27 1994-02-03 Feldmuehle Ag Stora Rapid CF paper prodn. for pressure-sensitive carbon@ paper - using 2 roll appts. (e.g. speed sizer) to give simultaneous front and back coating with uniform thin CF layer contg. colour acceptor
DE4224716A1 (en) * 1992-07-27 1994-02-03 Feldmuehle Ag Stora Coated front paper prodn. for pressure-sensitive recording paper - by simultaneous application of front coat and back size coat with aq soln pref starch soln using rollers fed by grooved dosing doctors.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664058A (en) * 1985-10-25 1987-05-12 International Paper Company Coating roll surface configuration for applying liquid sterilant to a moving web
FI88421C (en) * 1990-04-19 1993-05-10 Valmet Paper Machinery Inc BESTRYKNINGSANORDNING FOER BESTRYKNINGS AV VALS I EN LIMPRESS, PAPPER ELLER KARTONG
DE4014647C2 (en) * 1990-05-08 1995-03-30 Voith Gmbh J M Device for applying a coating to a running web

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433165A (en) * 1973-09-13 1976-04-22 Wiggins Teape Ltd Coated
US4347269A (en) * 1980-04-08 1982-08-31 The Wiggins Teape Group Limited Method of and apparatus for applying a coating to a web of sheet material
EP0385640A2 (en) * 1989-02-23 1990-09-05 The Wiggins Teape Group Limited Process for applying microcapsule-containing compositions to paper
WO1991015306A1 (en) * 1990-04-03 1991-10-17 Btg Källe Inventing Ab Process for two-faced coating of a travelling web
DE4224719A1 (en) * 1992-07-27 1994-02-03 Feldmuehle Ag Stora Rapid CF paper prodn. for pressure-sensitive carbon@ paper - using 2 roll appts. (e.g. speed sizer) to give simultaneous front and back coating with uniform thin CF layer contg. colour acceptor
DE4224716A1 (en) * 1992-07-27 1994-02-03 Feldmuehle Ag Stora Coated front paper prodn. for pressure-sensitive recording paper - by simultaneous application of front coat and back size coat with aq soln pref starch soln using rollers fed by grooved dosing doctors.

Also Published As

Publication number Publication date
JPH08294652A (en) 1996-11-12
US5811157A (en) 1998-09-22
DE19511050A1 (en) 1996-09-26

Similar Documents

Publication Publication Date Title
AT392426B (en) GLUE PRESS WITH TWO PARALLEL PRESS ROLLERS
EP0675224B1 (en) Press for web material
DE3131799A1 (en) "ROLLING MILL, ESPECIALLY CALENDAR, FOR PAPER AND OTHER MATERIAL SHEETS"
DE2457618C3 (en) Method of creating a contrasting pattern on a plate and patterned plate - US Pat
DE2833377B2 (en) Process for applying * 1 "1" "* 1" coating material to a metal strip and apparatus for carrying out this process
DE2143950B2 (en) Process for the production of double-coated paper
DE2522965B2 (en) Smoothing device in the drying section of a paper machine
EP0735188A1 (en) Process and apparatus for making a paper sheet having a CF-coat applied thereon
DE19714645A1 (en) Web coating station roller
EP1755901B1 (en) Method for producing thermosensitive recording material and recording material produced according to said method
DE60016175T2 (en) Apparatus and method for embossing paper or nonwoven fabric, and the product produced
DE3714498A1 (en) COATED PAPER AND METHOD AND DEVICE FOR ITS PRODUCTION
DE19520442C2 (en) Roller press
EP1736321A1 (en) Process for producing a thermosensitive paper
DE2939757A1 (en) METHOD FOR PRODUCING ROLLS WITH NEGATIVE BALANCE
DE4115816A1 (en) Press bands prodn. for paper-making - by feeding e.g. fabric strips obliquely on to roller or substrate belt and embedding them in liq. coating of e.g. polyurethane resin
DE3129251C2 (en) Device for regulating the application weight of coatings on material guided in a moving web
DE19511049C2 (en) Method and device for producing a paper web having a CB layer
DE4243518C2 (en) Devices for applying liquid to both sides of a material web and method for applying a liquid to a material web with these devices
DE102019103703B4 (en) Device and method for coating and computer program product
EP1593778B1 (en) Process and apparatus for treating a web of paper or board
EP0799934A1 (en) Process and apparatus for applying a CB coat on a paper web
EP0029865B1 (en) Apparatus and process for coating moving webs of e.g. paper or board
DE3225982A1 (en) INK FOR A LITHOGRAPHIC PRINTING MACHINE
DE19642047A1 (en) Press unit of a paper or paperboard-making machine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FI FR GB SE

17P Request for examination filed

Effective date: 19961011

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VOITH SULZER PAPIERTECHNIK PATENT GMBH

17Q First examination report despatched

Effective date: 20000717

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20001128