EP1088595B1 - Device for applying an abrasive substance onto a moving web - Google Patents

Device for applying an abrasive substance onto a moving web Download PDF

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Publication number
EP1088595B1
EP1088595B1 EP00116909A EP00116909A EP1088595B1 EP 1088595 B1 EP1088595 B1 EP 1088595B1 EP 00116909 A EP00116909 A EP 00116909A EP 00116909 A EP00116909 A EP 00116909A EP 1088595 B1 EP1088595 B1 EP 1088595B1
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EP
European Patent Office
Prior art keywords
roller
paper web
textured
guide roller
metering
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.)
Expired - Lifetime
Application number
EP00116909A
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German (de)
French (fr)
Other versions
EP1088595A3 (en
EP1088595A2 (en
Inventor
Gisbert Krossa
Walter Müller
Ernst Klas
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.)
Vits Verwaltungs GmbH
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Vits Verwaltungs GmbH
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Publication date
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Publication of EP1088595A2 publication Critical patent/EP1088595A2/en
Publication of EP1088595A3 publication Critical patent/EP1088595A3/en
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Publication of EP1088595B1 publication Critical patent/EP1088595B1/en
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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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • 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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0245—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
    • 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
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D21H23/72—Plural serial stages only
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/18—Paper- or board-based structures for surface covering
    • D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
    • D21H27/26—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
    • D21H27/28—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures treated to obtain specific resistance properties, e.g. against wear or weather

Definitions

  • the invention relates to a device for applying a coating composition consisting of liquid resin and fine-grained abrasive material, in particular corundum, to a continuous paper web intended for use in the production of abrasion-resistant laminates, according to the preamble of claim 1.
  • DE 195 08 797 C1 describes a process for the production of decorative paper for use in the production of abrasion-resistant laminates.
  • a viscous mixture of melamine resin and alpha-cellulose the corundum particles are added, applied as a coating composition on the visible surface of a decorative paper.
  • the alpha-cellulose serves as a stiffening and suspending agent.
  • the corundum particles have a particle size of 15-50 microns.
  • the order amount is 80-200 g / m 2 , so that after reaching the final moisture a layer thickness of 20-65 microns results.
  • the coating composition should be applied by means of a wire doctor blade, a reverse coating system or an anilox roller.
  • a leveling device namely a squeegee, consisting of a substantially rectangular lobe made of a flexible rubber-like material, which is secured on its rear, parallel to the axes of the two rollers edge on one side of a retaining strip and limp rests on the run of the guide roller upper run of the paper web.
  • a worm is used for smoothing the surface of wet brick moldings.
  • a mold filled with moist clay is moved under the rotating screw. In doing so, excess clay is stripped off. It falls into a laterally arranged shaft and is recycled.
  • DE 195 41 000 A1 describes a device for smoothing continuous gypsum fiber boards, consisting essentially of a screw which is arranged transversely over a conveyor belt for the continuous gypsum fiber boards.
  • the rotating screw carries in the manner of a scraper from the surface of the passing below her, already set gypsum fiber board, which may still be moist or already dried, from fine particles, which are transported by the conveying action of the screw to the edge and fall into a container.
  • EP 362 174 A discloses a device for coating a paper web, in which the coating is applied to a metering roller with a textured roller whose circumferential surface is provided with grooves and then onto the paper web from this.
  • the coating is not smoothed after application to the paper web.
  • the device is not suitable because of high wear for applying abrasive coating materials.
  • the invention has for its object to further develop a device according to the preamble of claim 1, so that it is difficult even when using Processible coating compositions evenly coated papers without visible stripes supplies.
  • the leveling device comprises at least one structure roller whose envelope has a thread-like structure, and a doctor blade, which is arranged in the web before or behind the (the) structure roller (s) and an im has substantially rectangular flap of flexible, rubbery material which is fixed on one side at its rear edge, parallel to the axis of the structure roller (s) and rests flaccid on the running of the guide roller upper run of the paper web
  • FIGS 1, 2 and 4 illustrate various devices according to the prior art.
  • FIGS 3 and 3a illustrate various devices according to the invention.
  • FIG. 5 to 7 illustrate various structural rolls.
  • a paper web 1 which is already pre-impregnated with resin, if appropriate also already dried, is fed in a horizontal direction to a deflecting roller 2. It wraps around the guide roller 2 in the region of an arc of 180 °, which is limited approximately in the six o'clock position by the casserole line 3 and in the twelve o'clock position by the discharge line 4. Subsequently, the paper web 1 runs in the horizontal direction, as symbolized by the arrow 5, to a dryer, not shown.
  • a metering roller 6 is arranged with a smooth lateral surface. It has in the illustrated embodiment, the same diameter as the guide roller 2.
  • the axes of the guide roller 2 and the metering roller 6 are mounted parallel to each other at the same height in a machine frame, not shown.
  • the storage of one of the two rollers 2, 6 is displaceable in the horizontal direction, so that the width of the existing between the two rollers 2, 6 narrow gap is variable.
  • the metering roller 6 is as well as the guide roller 2 provided with a drive.
  • the drives of the two rollers 2, 6 are mechanically or electrically coupled, so that the rollers 2, 6 rotate synchronously or approximately synchronously, that is preferably with matching surface speed, which corresponds to the conveying speed of the paper web.
  • a slot nozzle 7 is arranged for applying the coating composition.
  • the slot nozzle 7 is adjacent the casserole line 3.
  • a leveling device 8 is arranged above the running upper run of the paper web 1. It comprises a structure roller 9 and a smooth roller 10, which is arranged in the web running direction behind the structure roller 9.
  • the structure roller 9 and the smooth roller 10 are adjustable in height, so that their distances from the paper web 1 are variable.
  • a support roller 11 is arranged in the direction of the arrow 5 behind the equalizer 8 under the paper web 1.
  • the envelope surface of the structure roller 9 has a thread-like structure.
  • the illustrated in Figure 5 structure roller is provided with a helical groove 12 which extends in accordance with the working width substantially over the entire length of the pattern roller 9.
  • the remaining between adjacent passages web 13 is rectangular in section and has approximately the same width as the groove 12.
  • the envelope surface therefore has the structure of a catchy thread.
  • the structure roller illustrated in Figure 6 differs in that it is provided with a multi-thread, namely with a three-start thread.
  • the pitch is increased accordingly with unchanged cross-section of the grooves and lands, as well as the pitch angle.
  • the structural roll illustrated in Figure 7 is opposed to a system of helical grooves of equal pitch Provided screw sense.
  • the system comprises three right-handed and left-handed grooves.
  • the left-hand grooves correspond to the grooves illustrated in FIG.
  • By the intersecting grooves a flat, pronounced of a tile surface relief of diamond-shaped islands 14 is worked out of the roller, whose one diagonal is directed parallel to the roll axis.
  • the second diagonal is perpendicular to it.
  • the paper web 1 runs in operation at a speed between about 10 and 70 m / min, preferably between 20 and 50 m / min.
  • coating composition which consists of liquid resin and fine corundum particles suspended therein, in excess directly on the paper web.
  • the thus formed layer is split in the narrow gap between the guide roller 2 and the metering roller 6, so that a part of the coating material adheres to the paper, the other part is carried by the metering roller 6. Excess coating mass is jammed in the gap and drips off. Since the surface speeds of the two rollers 2, 6 have the same direction and are preferably at least approximately the same size, the abrasive particles contained in the coating mass do not cause any significant wear on the metering roller 6.
  • the layer adhering to the paper web - on average about 30 to 100 g / m 2 - is initially uneven, so that longitudinal strips are clearly visible.
  • the streaks can be explained by the fact that the liquid coating composition, when the nip is split due to surface tension, tends to contract at certain more or less evenly spaced locations.
  • the profile of the layer adhering to the paper web has maximums which appear as narrow stripes.
  • the width of a strip is usually about 5 mm, as a rule.
  • the distance between two adjacent strips is usually between about 10 and 30 mm.
  • the unwanted stripe pattern sometimes changes in an unpredictable way.
  • the pattern roller 9 is set to contact the paper web.
  • the rapidly rotating structure roller 9 in the embodiment according to FIG. 5 or FIG. 6 exercises with a screw comparable to the accumulated in the strip coating mass in the direction of its axis, that is transverse to the paper web 1, a promotional effect.
  • the prerequisite is that the surface speed of the structure roller 9 in the engagement region deviates considerably from the speed at which the paper web 1 moves in the direction of the arrow 5.
  • the conveying effect is directed on one side to one or the other edge of the paper web. Due to the conveying effect, the thickened strips are blurred in the transverse direction, so to speak. However, no coating composition is removed from the paper web 1.
  • the structure roller 9 therefore has only a comparative effect, but no influence on the dosage. For this reason, in the case of the structure roller 9-unlike in the case of the metering roller 6-extreme dimensional stability does not occur. Some wear has little effect on the effectiveness of the pattern roller 9. Therefore, the pattern roller 9 does not cause a particularly high cost.
  • the downstream smooth roller 10 which also rotates at high speed, causes even further homogenization.
  • the guide roller 2 and arranged in a relatively short distance support roller 11 the slack of the paper web 1, which is usually under a certain tension in operation, reduced in the region of the equalizer 8 to an imperceptible degree.
  • a roller may also be used as a structural roller 9, the envelope surface of which has the structure illustrated in FIG.
  • the coating material accumulated in the strip is removed by the edges of the diamond-shaped islands 14 inclined at an angle with respect to the surface speed, viewed partly in the direction of the surface speed, partly on one side and partly on the other side. This achieves a uniform distribution.
  • the embodiment illustrated in Figure 2 differs in particular in that the equalizer 8 comprises two successively arranged structural rollers 9, 9a. Another difference is that the slot nozzle 7 is assigned to the metering roller 6.
  • the leveling device comprises a doctor blade 15, which is arranged in the web run in front of the structure roller 9. It consists of a substantially rectangular lobes 16 of flexible rubber-like material, which is fixed on its rear, parallel to the axis of the structure roller 9 edge on one holding strip 17 and slack on the running of the guide roller 2 upper run of the paper web 1 rests.
  • the flap 16 already causes a certain pre-adjustment.
  • the embodiment of Figure 3 differs from the previously discussed embodiments in that the metering roller 6 is associated with a similar squeegee 18.
  • the associated retaining strip 19 is arranged obliquely above the metering roller 6, on the side facing away from the deflecting roller 2.
  • FIG. 3 a differs from that of FIG. 3 in that the squeegee 15, viewed in the direction of travel, is arranged behind the structure roller 9, so that the tab 16 rests on the paper web 1 via the support roller 11. Any behind the pattern roller 9 still visible, obliquely running strips are smoothed by the flap 16.
  • the metering roller 6 is arranged almost vertically-approximately in the eleven-clock position-above the deflecting roller 2. Therefore, the paper web passes between metering and leveling only a relatively short distance and only needs a correspondingly short time interval for this. This has, as experiments have shown, a positive influence on the equalization.

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  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The coating levelling device (8) comprises at least one textured roll (9) with a threaded mantle. The coating station contains a guide roll (2) around which the paper web (1) is passed, and which forms a nip with a parallel dosing roll (6). A slit nozzle (7) applies the coating material to the dosing roll or to the web on the guide roll.

Description

Die Erfindung betrifft eine Vorrichtung zum Auftragen einer aus flüssigem Harz und feinkörnigem abrasiven Material, insbesondere Korund, bestehenden Beschichtungsmasse auf eine durchlaufende Papierbahn, die zur Verwendung bei der Herstellung abriebfester Laminate bestimmt ist, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for applying a coating composition consisting of liquid resin and fine-grained abrasive material, in particular corundum, to a continuous paper web intended for use in the production of abrasion-resistant laminates, according to the preamble of claim 1.

Die DE 195 08 797 C1 beschreibt ein Verfahren zur Herstellung von Dekorpapier zur Verwendung bei der Herstellung von abriebfesten Laminaten. Dabei wird ein viskoses Gemisch aus Melaminharz und Alpha-Cellulose, dem Korundpartikel zugesetzt sind, als Beschichtungsmasse auf die Sichtfläche eines Dekorpapiers aufgetragen. Die Alpha-Cellulose dient dabei als Versteifungs- und Suspendierungsmittel. Die Korundpartikel haben eine Korngröße von 15 - 50 µm. Die Auftragmenge beträgt 80 - 200 g/m2, so daß sich nach Erreichen der Endfeuchte eine Schichtdicke von 20 - 65 µm ergibt. Die Beschichtungsmasse soll mittels eines Drahtrakels, eines Reverse Coating Systems oder einer Rasterwalze aufgetragen werden.DE 195 08 797 C1 describes a process for the production of decorative paper for use in the production of abrasion-resistant laminates. In this case, a viscous mixture of melamine resin and alpha-cellulose, the corundum particles are added, applied as a coating composition on the visible surface of a decorative paper. The alpha-cellulose serves as a stiffening and suspending agent. The corundum particles have a particle size of 15-50 microns. The order amount is 80-200 g / m 2 , so that after reaching the final moisture a layer thickness of 20-65 microns results. The coating composition should be applied by means of a wire doctor blade, a reverse coating system or an anilox roller.

In der DE 198 14 212 C1 wird eine Vorrichtung beschrieben, die speziell zum Auftragen einer derartigen Beschichtungsmasse bestimmt ist. Auf dieser Vorrichtung, die sich schon seit einiger Zeit im großtechnischen Maßstab bewährt hat, baut die Erfindung auf. Bei der bekannten Vorrichtung ist die Dosierwalze mit der Umlenkwalze synchronisiert, so daß die Oberflächengeschwindigkeiten der beiden Walzen am Dosierspalt nach Größe und Richtung übereinstimmen. Zwischen der Dosierwalze und der an der Papierbahn anhaftenden Beschichtungsmasse besteht daher keine Relativgeschwindigkeit. Auf diese Weise wird der Verschleiß der Dosierwalze durch die in der Beschichtungsmasse enthaltenen abrasiven Partikel so klein wie möglich gehalten. Man entnimmt aber der Schrift, daß der Gleichlauf der beiden Walzen ein anderes Problem verursacht: In dem engen Spalt zwischen Dosierwalze und Umlenkwalze wird die an der Papierbahn bereits anhaftende Schicht - anders als bei einer gegenläufigen Dosierwalze- gespalten, so daß ein Teil der Beschichtungsmasse an der Papierbahn haften bleibt, ein anderer Teil von der Dosierwalze mitgeführt wird. Nachdem die Papierbahn den Walzenspalt durchlaufen hat, ist die anhaftende Schicht zunächst noch ungleichmäßig, so daß Längsstreifen deutlich sichtbar sind. Um dieses Streifenmuster zu beseitigen, ist eine Egalisiereinrichtung vorgesehen, und zwar ein Rakel, bestehend aus einem im wesentlichen rechteckigen Lappen aus einem flexiblen gummiartigen Material, der an seiner rückwärtigen, zu den Achsen der beiden Walzen parallelen Kante einseitig an einer Halteleiste befestigt ist und schlaff auf dem von der Umlenkwalze ablaufenden oberen Trum der Papierbahn aufliegt.In DE 198 14 212 C1, a device is described, which is intended specifically for applying such a coating composition. On this device, which has been proven for some time on an industrial scale, the invention is based on. In the known device, the metering roller is synchronized with the guide roller, so that the surface velocities of the two rollers on the metering coincide in size and direction. There is therefore no relative speed between the metering roller and the coating material adhering to the paper web. In this way, the wear of the metering roller is kept as small as possible by the abrasive particles contained in the coating composition. However, it is apparent from the document that the synchronization of the two rolls causes another problem: in the narrow gap between metering roll and guide roll the layer already adhering to the paper web is split, unlike a counter-rotating metering roller, so that part of the coating material adheres to the paper web and another part is carried along by the metering roller. After the paper web has passed through the nip, the adherent layer is initially still uneven, so that longitudinal strips are clearly visible. To eliminate this fringe pattern, a leveling device is provided, namely a squeegee, consisting of a substantially rectangular lobe made of a flexible rubber-like material, which is secured on its rear, parallel to the axes of the two rollers edge on one side of a retaining strip and limp rests on the run of the guide roller upper run of the paper web.

Je nach der Konsistenz der Beschichtungsmasse, die wegen der unterschiedlichen Rezepturen der einzelnen Hersteller von Dekorpapier merkliche Unterschiede aufweisen kann, reicht aber ein derartiger Lappen nicht immer aus, um das unerwünschte Streifenmuster völlig unsichtbar zu machen.Depending on the consistency of the coating composition, which may have noticeable differences because of the different formulations of the individual manufacturers of decorative paper, but such a lobe is not always enough to make the unwanted stripe pattern completely invisible.

Gemäß US-PS 19 39 012 wird zum Glattstreichen der Oberfläche von feuchten Ziegelsteinformlingen eine Schnecke eingesetzt. Eine mit feuchtem Lehm gefüllte Form wird unter der rotierenden Schnecke hindurchbewegt. Dabei wird überschüssiger Lehm abgestreift. Er fällt in einen seitlich angeordneten Schacht und wird einer neuen Verwertung zugeführt.According to US-PS 19 39 012, a worm is used for smoothing the surface of wet brick moldings. A mold filled with moist clay is moved under the rotating screw. In doing so, excess clay is stripped off. It falls into a laterally arranged shaft and is recycled.

Die DE 195 41 000 A1 beschreibt eine Vorrichtung zum Glätten von durchlaufenden Gipsfaserplatten, bestehend im wesentlichen aus einer Schnecke, die quer über einem Förderband für die durchlaufenden Gipsfaserplatten angeordnet ist. Die rotierende Schnecke trägt nach Art eines Schabers von der Oberfläche der unter ihr durchlaufenden, bereits abgebundenen Gipsfaserplatte, die noch feucht oder schon getrocknet sein kann, feine Partikel ab, die durch die Förderwirkung der Schnecke zum Rand transportiert werden und dort in einen Behälter fallen.DE 195 41 000 A1 describes a device for smoothing continuous gypsum fiber boards, consisting essentially of a screw which is arranged transversely over a conveyor belt for the continuous gypsum fiber boards. The rotating screw carries in the manner of a scraper from the surface of the passing below her, already set gypsum fiber board, which may still be moist or already dried, from fine particles, which are transported by the conveying action of the screw to the edge and fall into a container.

Die EP 362 174 A offenbart eine Vorrichtung zum Beschichten einer Papierbahn, bei der die Beschichtung mit einer Strukturwalze, deren Mantelfläche mit Nuten versehen ist, auf eine Dosierwalze und dann von dieser auf die Papierbahn aufgetragen wird. Die Beschichtung wird nach dem Auftrag auf die Papierbahn nicht geglättet. Die Vorrichtung ist wegen hohen Verschleißes zum Auftragen von abrasiven Beschichtungsmassen nicht geeignet.EP 362 174 A discloses a device for coating a paper web, in which the coating is applied to a metering roller with a textured roller whose circumferential surface is provided with grooves and then onto the paper web from this. The coating is not smoothed after application to the paper web. The device is not suitable because of high wear for applying abrasive coating materials.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 weiter zu entwickeln, so daß sie auch bei Einsatz schwer verarbeitbarer Beschichtungsmassen gleichmäßig beschichtete Papiere ohne sichtbare Streifen liefert.The invention has for its object to further develop a device according to the preamble of claim 1, so that it is difficult even when using Processible coating compositions evenly coated papers without visible stripes supplies.

Diese Aufgabe wird gemäß dem Kennzeichen des Anspruchs 1 dadurch gelöst, daß die Egalisiereinrichtung mindestens eine Strukturwalze, deren Hüllfläche eine gewindeartige Struktur hat, sowie ein Rakel umfaßt, welches im Bahnlauf vor oder hinter der (den) Strukturwalze(n) angeordnet ist und einen im wesentlichen rechtwinkeligen Lappen aus flexiblem, gummiartigem Material aufweist, der an seiner rückwärtigen, zur Achse der Strukturwalze(n) parallelen Kante einseitig befestigt ist und schlaff auf dem von der Umlenkwalze ablaufenden oberen Trum der Papierbahn aufliegtThis object is achieved according to the characterizing part of claim 1, characterized in that the leveling device comprises at least one structure roller whose envelope has a thread-like structure, and a doctor blade, which is arranged in the web before or behind the (the) structure roller (s) and an im has substantially rectangular flap of flexible, rubbery material which is fixed on one side at its rear edge, parallel to the axis of the structure roller (s) and rests flaccid on the running of the guide roller upper run of the paper web

Weitere vorteilhafte Merkmale der Erfindung sind Gegenstand der Ansprüche 2 bis 9.Further advantageous features of the invention are subject matter of claims 2 to 9.

Die Zeichnung dient zur Erläuterung der Erfindung anhand von schematisch dargestellten Ausführungsbeispielen.The drawing serves to explain the invention with reference to schematically illustrated embodiments.

Die Figuren 1, 2 und 4 veranschaulichen verschiedene Vorrichtungen gemäß dem Stand der Technik.Figures 1, 2 and 4 illustrate various devices according to the prior art.

Die Figuren 3 und 3a veranschaulichen verschiedene Vorrichtungen gemäß der Erfindung.Figures 3 and 3a illustrate various devices according to the invention.

Die Figuren 5 bis 7 veranschaulichen verschiedene Strukturwalzen.Figures 5 to 7 illustrate various structural rolls.

Gemäß Figur 1 wird eine Papierbahn 1, die bereits mit Harz vorimprägniert, gegebenenfalls auch schon getrocknet ist, in waagerechter Richtung einer Umlenkwalze 2 zugeführt. Sie umschlingt die Umlenkwalze 2 im Bereich eines Bogens von 180°, der etwa in der Sechsuhr- Position durch die Auflauflinie 3 und in der Zwölfuhr- Position durch die Ablauflinie 4 begrenzt ist. Anschließend läuft die Papierbahn 1 in waagerechter Richtung, wie durch den Pfeil 5 symbolisiert, zu einem nicht dargestellten Trockner.According to FIG. 1, a paper web 1, which is already pre-impregnated with resin, if appropriate also already dried, is fed in a horizontal direction to a deflecting roller 2. It wraps around the guide roller 2 in the region of an arc of 180 °, which is limited approximately in the six o'clock position by the casserole line 3 and in the twelve o'clock position by the discharge line 4. Subsequently, the paper web 1 runs in the horizontal direction, as symbolized by the arrow 5, to a dryer, not shown.

Neben der Umlenkwalze 2 ist eine Dosierwalze 6 mit glatter Mantelfläche angeordnet. Sie hat bei dem dargestellten Ausführungsbeispiel den gleichen Durchmesser wie die Umlenkwalze 2. Die Achsen der Umlenkwalze 2 und der Dosierwalze 6 sind parallel zueinander in gleicher Höhe in einem nicht dargestellten Maschinengestell gelagert. Die Lagerung einer der beiden Walzen 2, 6 ist in waagerechter Richtung verschieblich, so daß die Breite des zwischen den beiden Walzen 2, 6 bestehenden engen Spaltes veränderlich ist. Die Dosierwalze 6 ist ebenso wie die Umlenkwalze 2 mit einem Antrieb versehen. Die Antriebe der beiden Walzen 2, 6 sind mechanisch oder elektrisch gekoppelt, so daß die Walzen 2, 6 synchron oder annähernd synchron umlaufen, das heißt vorzugsweise mit übereinstimmender Oberflächengeschwindigkeit, die der Fördergeschwindigkeit der Papierbahn entspricht.In addition to the guide roller 2, a metering roller 6 is arranged with a smooth lateral surface. It has in the illustrated embodiment, the same diameter as the guide roller 2. The axes of the guide roller 2 and the metering roller 6 are mounted parallel to each other at the same height in a machine frame, not shown. The storage of one of the two rollers 2, 6 is displaceable in the horizontal direction, so that the width of the existing between the two rollers 2, 6 narrow gap is variable. The metering roller 6 is as well as the guide roller 2 provided with a drive. The drives of the two rollers 2, 6 are mechanically or electrically coupled, so that the rollers 2, 6 rotate synchronously or approximately synchronously, that is preferably with matching surface speed, which corresponds to the conveying speed of the paper web.

Unter der Umlenkwalze 2 ist eine Schlitzdüse 7 zum Auftragen der Beschichtungsmasse angeordnet. Die Schlitzdüse 7 ist der Auflauflinie 3 benachbart.Under the deflection roller 2, a slot nozzle 7 is arranged for applying the coating composition. The slot nozzle 7 is adjacent the casserole line 3.

In kurzem Abstand von der Ablauflinie 4 ist über dem ablaufenden oberen Trum der Papierbahn 1 eine Egalisiereinrichtung 8 angeordnet. Sie umfaßt eine Strukturwalze 9 und eine glatte Walze 10, die in Bahnlaufrichtung hinter der Strukturwalze 9 angeordnet ist. Die Strukturwalze 9 und die glatte Walze 10 sind höhenverstellbar, so daß ihre Abstände von der Papierbahn 1 veränderlich sind. In kurzem Abstand, der etwa dem Abstand der Walze 10 von der Auflauflinie 4 entspricht, ist in Richtung des Pfeils 5 hinter der Egalisiereinrichtung 8 unter der Papierbahn 1 eine Stützwalze 11 angeordnet.At a short distance from the flow line 4, a leveling device 8 is arranged above the running upper run of the paper web 1. It comprises a structure roller 9 and a smooth roller 10, which is arranged in the web running direction behind the structure roller 9. The structure roller 9 and the smooth roller 10 are adjustable in height, so that their distances from the paper web 1 are variable. At a short distance, which corresponds approximately to the distance of the roller 10 from the casserole line 4, a support roller 11 is arranged in the direction of the arrow 5 behind the equalizer 8 under the paper web 1.

Die Hüllfläche der Strukturwalze 9 hat eine gewindeartige Struktur. Die in Figur 5 veranschaulichte Strukturwalze ist mit einer schraubenlinienförmigen Nut 12 versehen, die sich entsprechend der Arbeitsbreite im wesentlichen über die ganze Länge der Strukturwalze 9 erstreckt. Der zwischen benachbarten Gängen verbleibende Steg 13 ist im Schnitt rechteckig und hat etwa die gleiche Breite wie die Nut 12. Die Hüllfläche hat daher die Struktur eines eingängigen Gewindes.The envelope surface of the structure roller 9 has a thread-like structure. The illustrated in Figure 5 structure roller is provided with a helical groove 12 which extends in accordance with the working width substantially over the entire length of the pattern roller 9. The remaining between adjacent passages web 13 is rectangular in section and has approximately the same width as the groove 12. The envelope surface therefore has the structure of a catchy thread.

Hiervon unterscheidet sich die in Figur 6 veranschaulichte Strukturwalze dadurch, daß sie mit einem mehrgängigen, und zwar mit einem dreigängigen Gewinde versehen ist. Dadurch wird bei unverändertem Querschnitt der Nuten und Stege die Ganghöhe entsprechend vergrößert, ebenso der Steigungswinkel.Of these, the structure roller illustrated in Figure 6 differs in that it is provided with a multi-thread, namely with a three-start thread. As a result, the pitch is increased accordingly with unchanged cross-section of the grooves and lands, as well as the pitch angle.

Die in Figur 7 veranschaulichte Strukturwalze ist mit einem System von schraubenlinienförmigen Nuten gleicher Steigung mit entgegengesetztem Schraubensinn versehen. Das System umfaßt je drei rechtsgängige und linksgängige Nuten. Die linksgängigen Nuten entsprechen den in Figur 6 veranschaulichten Nuten. Durch die einander kreuzenden Nuten wird aus der Walze ein flaches, an einen Fliesenbelag erinnerndes Relief aus rautenförmigen Inseln 14 herausgearbeitet, deren eine Diagonale parallel zur Walzenachse gerichtet ist. Die zweite Diagonale liegt rechtwinkelig dazu.The structural roll illustrated in Figure 7 is opposed to a system of helical grooves of equal pitch Provided screw sense. The system comprises three right-handed and left-handed grooves. The left-hand grooves correspond to the grooves illustrated in FIG. By the intersecting grooves a flat, reminiscent of a tile surface relief of diamond-shaped islands 14 is worked out of the roller, whose one diagonal is directed parallel to the roll axis. The second diagonal is perpendicular to it.

Bei der Vorrichtung gemäß Figur 1 läuft die Papierbahn 1 im Betrieb mit einer Geschwindigkeit zwischen etwa 10 und 70 m/min, vorzugsweise zwischen 20 und 50 m/min durch. Mit der Schlitzdüse 7 wird von unten Beschichtungsmasse, die aus flüssigem Harz und darin suspendierten feinen Korundpartikeln besteht, im Überschuß direkt auf die Papierbahn aufgetragen. Die so gebildete Schicht wird in dem engen Spalt zwischen der Umlenkwalze 2 und der Dosierwalze 6 gespalten, so daß ein Teil der Beschichtungsmasse an dem Papier haften bleibt, der andere Teil von der Dosierwalze 6 mitgeführt wird. Überschüssige Beschichtungsmasse wird in dem Spalt gestaut und tropft ab. Da die Oberflächengeschwindigkeiten der beiden Walzen 2, 6 die gleiche Richtung haben und vorzugsweise zumindest annähernd gleich groß sind, verursachen die in der Beschichtungsmasse enthaltenen abrasiven Partikel keinen nennenswerten Verschleiß an der Dosierwalze 6.In the apparatus of Figure 1, the paper web 1 runs in operation at a speed between about 10 and 70 m / min, preferably between 20 and 50 m / min. With the slit nozzle 7 is applied from below coating composition, which consists of liquid resin and fine corundum particles suspended therein, in excess directly on the paper web. The thus formed layer is split in the narrow gap between the guide roller 2 and the metering roller 6, so that a part of the coating material adheres to the paper, the other part is carried by the metering roller 6. Excess coating mass is jammed in the gap and drips off. Since the surface speeds of the two rollers 2, 6 have the same direction and are preferably at least approximately the same size, the abrasive particles contained in the coating mass do not cause any significant wear on the metering roller 6.

Die an der Papierbahn anhaftende Schicht -im Mittel etwa 30 bis 100 g/m2- ist zunächst ungleichmäßig, so daß Längsstreifen deutlich sichtbar sind. Die Streifen sind dadurch zu erklären, daß die flüssige Beschichtungsmasse bei der Aufspaltung der Schicht im Walzenspalt infolge der Oberflächenspannung dazu tendiert, sich an bestimmten, mehr oder weniger gleichmäßig über die Breite verteilten Stellen zusammenzuziehen. An diesen Stellen hat das Profil der an der Papierbahn anhaftenden Schicht Maxima, die als schmale Streifen in Erscheinung treten. Die Breite eines Streifens beträgt erfahrungsgemäß in der Regel etwa 5 mm. Der Abstand zweier benachbarter Streifen liegt meistens zwischen etwa 10 und 30 mm. Das unerwünschte Streifenmuster ändert sich mitunter in unvorhersehbarer Weise.The layer adhering to the paper web - on average about 30 to 100 g / m 2 - is initially uneven, so that longitudinal strips are clearly visible. The streaks can be explained by the fact that the liquid coating composition, when the nip is split due to surface tension, tends to contract at certain more or less evenly spaced locations. At these points, the profile of the layer adhering to the paper web has maximums which appear as narrow stripes. The width of a strip is usually about 5 mm, as a rule. The distance between two adjacent strips is usually between about 10 and 30 mm. The unwanted stripe pattern sometimes changes in an unpredictable way.

Die Strukturwalze 9 ist so eingestellt, daß sie die Papierbahn berührt. Die schnell rotierende Strukturwalze 9 in der Ausführung gemäß Figur 5 oder Figur 6 übt -mit einer Schnecke vergleichbar- auf die in den Streifen angehäufte Beschichtungsmasse in Richtung ihrer Achse, das heißt quer zur Papierbahn 1, eine fördernde Wirkung aus. Voraussetzung ist natürlich, daß die Oberflächengeschwindigkeit der Strukturwalze 9 im Eingriffsbereich erheblich von der Geschwindigkeit abweicht, mit der sich die Papierbahn 1 in Richtung des Pfeils 5 bewegt. Je nach dem Drehsinn, mit dem die Strukturwalze 9 rotiert, und dem Schraubensinn des Gewindes ist die fördernde Wirkung einseitig zu dem einen oder dem anderen Rand der Papierbahn gerichtet. Durch die Förderwirkung werden die verdickten Streifen dabei in Querrichtung sozusagen verwischt. Es wird aber keine Beschichtungsmasse von der Papierbahn 1 entfernt. Die Strukturwalze 9 hat daher nur eine vergleichmäßigende Wirkung, aber keinen Einfluß auf die Dosierung. Aus diesem Grunde kommt es bei der Strukturwalze 9 -anders als bei der Dosierwalze 6- nicht auf extreme Maßhaltigkeit an. Ein gewisser Verschleiß hat kaum einen Einfluß auf die Wirksamkeit der Strukturwalze 9. Daher verursacht die Strukturwalze 9 keine besonders hohen Kosten.The pattern roller 9 is set to contact the paper web. The rapidly rotating structure roller 9 in the embodiment according to FIG. 5 or FIG. 6 exercises with a screw comparable to the accumulated in the strip coating mass in the direction of its axis, that is transverse to the paper web 1, a promotional effect. The prerequisite, of course, is that the surface speed of the structure roller 9 in the engagement region deviates considerably from the speed at which the paper web 1 moves in the direction of the arrow 5. Depending on the direction of rotation, with which the structure roller 9 rotates, and the screw sense of the thread, the conveying effect is directed on one side to one or the other edge of the paper web. Due to the conveying effect, the thickened strips are blurred in the transverse direction, so to speak. However, no coating composition is removed from the paper web 1. The structure roller 9 therefore has only a comparative effect, but no influence on the dosage. For this reason, in the case of the structure roller 9-unlike in the case of the metering roller 6-extreme dimensional stability does not occur. Some wear has little effect on the effectiveness of the pattern roller 9. Therefore, the pattern roller 9 does not cause a particularly high cost.

Die nachgeschaltete glatte Walze 10, die ebenfalls mit hoher Geschwindigkeit rotiert, bewirkt noch eine weitere Vergleichmäßigung.The downstream smooth roller 10, which also rotates at high speed, causes even further homogenization.

Durch die Umlenkwalze 2 und die in relativ kurzem Abstand angeordnete Stützwalze 11 wird der Durchhang der Papierbahn 1, die in Betrieb üblicherweise unter einer gewissen Zugspannung steht, im Bereich der Egalisiereinrichtung 8 auf ein unmerkliches Maß reduziert.By the guide roller 2 and arranged in a relatively short distance support roller 11, the slack of the paper web 1, which is usually under a certain tension in operation, reduced in the region of the equalizer 8 to an imperceptible degree.

Bei der Vorrichtung gemäß Figur 1 kann auch als Strukturwalze 9 eine Walze eingesetzt werden, deren Hüllfläche die in Figur 7 veranschaulichte Struktur hat. Hierbei wird das in den Streifen akkumulierte Beschichtungsmaterial durch die -in Richtung der Oberflächengeschwindigkeit gesehen- vorderen, in Bezug auf die Oberflächengeschwindigkeit schiefwinkligen Kanten der rautenförmigen Inseln 14 teils zur einen und teils zur anderen Seite abgetragen. Dadurch wird eine gleichmäßige Verteilung erreicht.In the apparatus according to FIG. 1, a roller may also be used as a structural roller 9, the envelope surface of which has the structure illustrated in FIG. Here, the coating material accumulated in the strip is removed by the edges of the diamond-shaped islands 14 inclined at an angle with respect to the surface speed, viewed partly in the direction of the surface speed, partly on one side and partly on the other side. This achieves a uniform distribution.

Von dem soeben beschriebenen Ausführungsbeispiel gemäß Figur 1 unterscheidet sich das in Figur 2 veranschaulichte Ausführungsbeispiel insbesondere dadurch, daß die Egalisiereinrichtung 8 zwei hintereinander angeordnete Strukturwalzen 9, 9a umfaßt. Ein weiterer Unterschied besteht darin, daß die Schlitzdüse 7 der Dosierwalze 6 zugeordnet ist.Of the embodiment just described according to Figure 1, the embodiment illustrated in Figure 2 differs in particular in that the equalizer 8 comprises two successively arranged structural rollers 9, 9a. Another difference is that the slot nozzle 7 is assigned to the metering roller 6.

Bei dem Ausführungsbeispiel gemäß Figur 3 umfaßt die Egalisiereinrichtung ein Rakel 15, welches im Bahnlauf vor der Strukturwalze 9 angeordnet ist. Es besteht aus einem im wesentlichen rechteckigen Lappen 16 aus flexiblem, gummiartigem Material, der an seiner rückwärtigen, zur Achse der Strukturwalze 9 parallelen Kante einseitig an einer Halteleiste 17 befestigt ist und schlaff auf dem von der Umlenkwalze 2 ablaufenden oberen Trum der Papierbahn 1 aufliegt. Der Lappen 16 bewirkt schon eine gewisse Voregalisierung. Weiterhin unterscheidet sich das Ausführungsbeispiel nach Figur 3 von den vorher erörterten Ausführungsbeispielen dadurch, daß der Dosierwalze 6 ein ähnliches Rakel 18 zugeordnet ist. Die zugehörige Halteleiste 19 ist schräg über der Dosierwalze 6 angeordnet, und zwar an der Seite, die der Umlenkwalze 2 abgekehrt ist. Daran ist ein flexibler rechteckiger Kunststofflappen 20 einseitig aufgehängt. Der vordere Teil des Lappens liegt schlaff auf der Dosierwalze 6 auf. Durch den Lappen 20 wird die an der Dosierwalze 6 anhaftende Beschichtungsmasse egalisiert. Dadurch wird verhindert, daß ein ungleichmäßiges Profil der an der Dosierwalze 6 anhaftenden Schicht auf die Beschichtung der Papierbahn 1 übertragen wird.In the embodiment according to FIG. 3, the leveling device comprises a doctor blade 15, which is arranged in the web run in front of the structure roller 9. It consists of a substantially rectangular lobes 16 of flexible rubber-like material, which is fixed on its rear, parallel to the axis of the structure roller 9 edge on one holding strip 17 and slack on the running of the guide roller 2 upper run of the paper web 1 rests. The flap 16 already causes a certain pre-adjustment. Furthermore, the embodiment of Figure 3 differs from the previously discussed embodiments in that the metering roller 6 is associated with a similar squeegee 18. The associated retaining strip 19 is arranged obliquely above the metering roller 6, on the side facing away from the deflecting roller 2. At a flexible rectangular plastic cloth 20 is suspended on one side. The front part of the flap lies slack on the metering roller 6. By the tab 20, the adhering to the metering roller 6 coating composition is equalized. This prevents that an uneven profile of the adhering to the metering roller 6 layer is transferred to the coating of the paper web 1.

Das durch Figur 3 a veranschaulichte Ausführungsbeispiel unterscheidet sich von dem der Figur 3 dadurch, daß das Rakel 15 -in Laufrichtung gesehen- hinter der Strukturwalze 9 angeordnet ist, so daß der Lappen 16 über der Stützwalze 11 auf der Papierbahn 1 aufliegt. Etwaige hinter der Strukturwalze 9 noch sichtbare, schräg verlaufende Streifen werden durch den Lappen 16 geglättet.The exemplary embodiment illustrated by FIG. 3 a differs from that of FIG. 3 in that the squeegee 15, viewed in the direction of travel, is arranged behind the structure roller 9, so that the tab 16 rests on the paper web 1 via the support roller 11. Any behind the pattern roller 9 still visible, obliquely running strips are smoothed by the flap 16.

Bei dem Ausführungsbeispiel gemäß Figur 4 ist die Dosierwalze 6 nahezu senkrecht -etwa in der Elfuhr-Position- über der Umlenkwalze 2 angeordnet. Daher durchläuft die Papierbahn zwischen Dosierung und Egalisierung nur eine relativ kurze Strecke und benötigt dafür nur ein entsprechend kurzes Zeitintervall. Das hat, wie Versuche ergeben haben, einen positiven Einfluß auf die Egalisierung.In the embodiment according to FIG. 4, the metering roller 6 is arranged almost vertically-approximately in the eleven-clock position-above the deflecting roller 2. Therefore, the paper web passes between metering and leveling only a relatively short distance and only needs a correspondingly short time interval for this. This has, as experiments have shown, a positive influence on the equalization.

Claims (9)

  1. A device for applying a coating mass comprising a liquid resin and a fine-grain abrasive material, particularly corundum, to a continuous paper web (1), which is intended for use in the manufacture of abrasion-resistant laminates,
    having a guide roller (2) against which the paper web (1) lies in a contact region,
    having a metering roller (6) which is arranged parallel to the guide roller (2) and forms a narrow gap therewith, having a slot nozzle (7) for applying the coating mass either directly to the paper web (1) lying against the guide roller (2) or to the metering roller (6),
    and having a device for levelling (8) the coating mass freshly applied to the paper web (1),
    characterised in that the levelling device (8) comprises at least one textured roller (9, 9a) whereof the enveloping surface has a thread-like structure, and in that the levelling device (8) furthermore comprises a doctor blade (15) which is arranged in the path of the web upstream or downstream of the textured roller(s) (9, 9a) and has a substantially rectangular tab (16) of flexible rubber-like material which is secured on one side by its rear edge, which is parallel to the axis of the textured roller(s) (9, 9a), and lies loosely against the upper strand of the paper web (1), which runs off the guide roller (2).
  2. A device according to Claim 1, characterised in that the textured roller (9, 9a) is provided with a multiple thread.
  3. A device according to Claim 1 or 2, characterised in that the textured roller (9, 9a) is provided with a system of mutually crossing helical grooves.
  4. A device according to one of Claims 1 to 3,
    characterised in that the levelling device (8) comprises at least two textured rollers (9, 9a).
  5. A device according to one of Claims 1 to 4,
    characterised in that the levelling device (8) comprises a smooth roller (10), which is arranged downstream of the textured roller(s) (9, 9a) in the running direction of the web.
  6. A device according to one of Claims 1 to 5,
    characterised in that supporting members (2, 11) for the paper web (1) are arranged at a slight distance upstream and downstream of the region in which the levelling device (8) acts on the paper web (1).
  7. A device according to Claim 6, characterised in that the guide roller (2) forms one supporting member and an additional supporting roller (11) is provided as the second supporting member.
  8. A device according to one of Claims 1 to 7,
    characterised in that, when the strand of the paper web (1) which runs off the guide roller (2) is guided horizontally, the metering roller (6) is arranged perpendicularly or virtually perpendicularly above the guide roller (2).
  9. A device according to one of Claims 1 to 8,
    characterised in that a doctor blade (18) is associated with the metering roller (6).
EP00116909A 1999-09-28 2000-08-05 Device for applying an abrasive substance onto a moving web Expired - Lifetime EP1088595B1 (en)

Applications Claiming Priority (2)

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DE19946325 1999-09-28
DE19946325A DE19946325A1 (en) 1999-09-28 1999-09-28 Device for applying an abrasive coating compound to a continuous paper web

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EP1088595A3 EP1088595A3 (en) 2004-07-14
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EP1088595A3 (en) 2004-07-14
EP1088595A2 (en) 2001-04-04
ATE337106T1 (en) 2006-09-15
ES2270767T3 (en) 2007-04-16
DE50013349D1 (en) 2006-10-05
US6471776B1 (en) 2002-10-29

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