EP1084298A1 - Device for applying a coating substance to a continuous paper web - Google Patents

Device for applying a coating substance to a continuous paper web

Info

Publication number
EP1084298A1
EP1084298A1 EP99917837A EP99917837A EP1084298A1 EP 1084298 A1 EP1084298 A1 EP 1084298A1 EP 99917837 A EP99917837 A EP 99917837A EP 99917837 A EP99917837 A EP 99917837A EP 1084298 A1 EP1084298 A1 EP 1084298A1
Authority
EP
European Patent Office
Prior art keywords
paper web
roller
applying
deflector roll
metering roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99917837A
Other languages
German (de)
French (fr)
Other versions
EP1084298B1 (en
Inventor
Ernst Klas
Gisbert Krossa
Willi Erkelenz
Heinz MÖRTL
Udo Unger
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 Maschinenbau GmbH
Kronospan GmbH
Original Assignee
Vits Maschinenbau GmbH
Kronospan 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
Priority claimed from DE1998114212 external-priority patent/DE19814212C1/en
Application filed by Vits Maschinenbau GmbH, Kronospan GmbH filed Critical Vits Maschinenbau GmbH
Publication of EP1084298A1 publication Critical patent/EP1084298A1/en
Application granted granted Critical
Publication of EP1084298B1 publication Critical patent/EP1084298B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/009—Tools not otherwise provided for
    • 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
    • B05C1/0834—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 the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/028—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with a body having a large flat spreading or distributing surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/045—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by the blades themselves
    • 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
    • D21H23/50—Spraying or projecting
    • 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
    • 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
    • D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • 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 which is intended for use in the production of abrasion-resistant laminates.
  • Alpha cellulose serves as a stiffening and suspending agent.
  • the corundum particles have a grain size of 15 to 50 ⁇ m.
  • the application rate is 80 to 200 g / m 2 , so that a layer thickness of 20 to 65 ⁇ m results after the final moisture has been reached.
  • the coating compound should be applied using a wire doctor, a reverse coating system or an anilox roller.
  • the invention has for its object to provide a device for applying a coating composition consisting of liquid resin and fine-grained abrasive material, in particular corundum, to a continuous paper web, which meets the following requirements:
  • a coating composition consisting of liquid resin and fine-grained abrasive material, in particular corundum
  • the coating composition should be applied in a relatively thick, uniform layer , as is required for papers intended for the production of abrasion-resistant laminates, in particular with an application amount of 80 to 200 g / m 2 .
  • the feature of claim 2 improves the uniformity of the applied layer even further.
  • the subject of claim 3 is a preferred embodiment of this feature.
  • An advantageous embodiment of the invention is the subject of claim 4 and in particular of claim 5.
  • the feature of claim 6 ensures that the coating composition applied to the metering roller can be observed much better. This makes pre-dosing easier. Since in the arrangement according to claim 6 the nozzle slot is at the bottom, it is possible to work with a low pump pressure. The settling of particles in the nozzle is completely avoided.
  • the feature of claim 7 prevents coating material from running into the nip when the machine is at a standstill and smearing the deflecting roller.
  • FIGS. 1 to 3 The drawing serves to illustrate the invention with reference to the exemplary embodiments shown schematically in FIGS. 1 to 3.
  • a paper web 1 which has already been pre-impregnated with resin, possibly also already dried, is fed to a deflecting roller 2 in the horizontal direction according to FIG. It wraps around the deflecting roller 2 in the region of an arc of 180 °, which is delimited on one side by the run-up line 3 and on the other side by the run-off line 4. Then it runs in the horizontal direction, as symbolized by arrow 5, to a dryer, not shown.
  • a metering roller 6 with a smooth roller jacket is arranged.
  • it has the same diameter as the deflecting roller 2.
  • the axes of the deflecting roller 2 and the metering roller 6 are mounted parallel to one another at the same height in a machine frame.
  • the mounting of one of the two rollers 2, 6 can be displaced in parallel in the horizontal direction, so that the width of the narrow gap existing between the two rollers 2, 6 is variable.
  • the metering roller 6, like the deflection roller 2, is 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.
  • a slot nozzle 7 for applying the coating material is arranged under the deflection roller 2.
  • the nozzle slot is adjacent to the ramp line 3.
  • a holding strip 8 Arranged above the deflecting roller 2 is a holding strip 8 which is connected to the machine frame and is parallel to the axes of the two rollers 2, 6. Attached to this - seen in the direction of arrow 5 - is the rear edge of a rectangular flap 9 made of flexible, rubber-like material, which extends over the entire working width, ie the width of the paper web 1 to be coated. The remaining edges of the rectangular tab 9 are free. Therefore, a strip-shaped part of the slack flap 9 lying opposite the retaining strip 8 lies loosely on the upper run of the paper web 1 running off the deflecting roller 2 in the vicinity of the drain line 4.
  • the length of the flap 9 - viewed in the direction of the arrow 5 - is approximately between 5 and 50 cm, preferably between approximately 10 and 30 cm.
  • the flap 9 is about 2 to 5 mm thick.
  • the paper web 1 runs at a speed between approximately 10 and 70 m / min, preferably between 20 and 50 m / min.
  • coating composition consisting of liquid resin and fine corundum particles suspended therein is applied in excess.
  • the layer thus applied is split in the narrow gap between deflection roller 2 and metering roller 6, so that part of the coating composition sticks to the paper web and another part is carried along by the metering roller 6. Excess coating mass is stowed in the gap and drips off. Since the surface speeds of the two rollers 2, 6 match at least approximately, the abrasive particles contained in the coating material do not cause any significant wear on the metering roller 6.
  • the layer adhering to the paper web 1 - on average about 80 to 200 g / m 2 - is initially uneven, so that longitudinal stripes are clearly visible. Experience has shown that their width is usually around 5 mm. The distance between the strips is usually between about 10 and 30 mm. The unwanted
  • the exemplary embodiment illustrated in FIG. 2 differs from the previously described exemplary embodiment in particular in that the slot nozzle 7 is directed onto the outer surface of the metering roller 6.
  • the coating composition applied to the metering roller 6 is partially transferred to the paper web 1 in the gap between the two rollers 2, 6. Otherwise, the two exemplary embodiments correspond to such an extent that further explanations of FIG. 2 are unnecessary. 5
  • the slot nozzle 7 is arranged above the metering roller 6, so that the coating composition is applied from above. It is somewhat offset to the apex line of the metering roller 6 in the direction of rotation. In the drawing, it is shown approximately in the Elschreib position.
  • the retaining bar 8 is flexible or connected by flexible fasteners to the machine frame, not shown, so that it can perform small movements relative to the machine frame.
  • a compressed air turbine vibrator 10 sits on the holding bar 8. It essentially consists of a block-shaped housing with a cylindrical cavity. A rotor 11 is rotatably mounted in the cavity so that its axis of rotation is aligned parallel to the retaining strip 8. It is provided with an imbalance, which is symbolically indicated in the drawing by a black colored sector. Radial ribs sit on the jacket of the rotor, comparable to the blades of a Pelton turbine. Two channels 12, 13, the axes of which are oriented tangentially to the rotor 11, open into the cavity of the vibrator on opposite sides. The channel 12 is connected to a compressed air source.
  • the duct 13, which may be provided with a silencer, not shown, is the outlet for the exhaust air.
  • the vibrator 10 is supplied with compressed air via the channel 12.
  • the rotor 11 is rotated.
  • Circular vibrations are generated by the imbalance of the rotor 1 1, which are transmitted to the retaining strip 8.
  • the flap 9 is also set in vibration.
  • the frequency of the vibrations is determined by the pressure of the air supplied. It is preferably between 100 and 200 Hz.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention relates to a device for applying a coating substance to a continuous paper web in a process for producing abrasion-resistant laminates for manufacturing decorative paper. Said coating substance consists of a viscous mixture of melamine resin and alphacellulose to which particles of corundum are added, and is applied to the visible surface of the paper. The inventive device comprises the following parts: a deflector roll (2) on which the paper web (1) lies in an area in which it loops around; a metering roll (6) which is arranged parallel to the deflector roll (2) and forms the boundary of a gap with the same, and which is driven synchronously or almost synchronously with said deflector roll; a slit nozzle (7) for applying the coating substance either directly to the paper web (1) on the deflector roll (2) or to the metering roll (6); a doctor blade consisting essentially of a rectangular piece (9) of flexible rubber-type material. This material is fixed on one side by its back edge, parallel to the axes of the two rolls (2, 6) and lies loosely on the upper end of the paper web (1) running off of the deflector roll (2).

Description

Vorrichtung zum Auftragen einer Beschichtungsmasse auf eine • durchlaufende PapierbahnDevice for applying a coating compound on a continuous paper web
Die Erfindung betrifft eine Vorrichtung zum Auftragen einer aus flüssigem Harz und feinkörnigem abrasivem Material, insbesondere Korund, bestehenden Beschichtungsmasse auf eine durchlaufende Papierbahn, die zur Verwendung bei der Herstellung abriebfester Laminate bestimmt ist.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 which is intended for use in the production of abrasion-resistant laminates.
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-Zellulose, dem Korundpartikel zugesetzt sind, als Beschichtungsmasse auf die Sichtfläche eines Dekorpapiers aufgetragen. Die Alpha-Zellulose dient dabei als Versteifungs- und Suspendierungsmittel. Die Korundpartikel haben eine Korngröße von 15 bis 50 μm. Die Auftragmenge beträgt 80 bis 200 g/m2, so daß sich nach Erreichen der Endfeuchte eine Schichtdicke von 20 bis 65 μm ergibt. Die Beschichtungsmasse soll mittels einer Drahtrakel, 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. A viscous mixture of melamine resin and alpha-cellulose, to which corundum particles have been added, is applied as a coating material to the visible surface of a decorative paper. Alpha cellulose serves as a stiffening and suspending agent. The corundum particles have a grain size of 15 to 50 μm. The application rate is 80 to 200 g / m 2 , so that a layer thickness of 20 to 65 μm results after the final moisture has been reached. The coating compound should be applied using a wire doctor, a reverse coating system or an anilox roller.
Die betriebliche Praxis hat gezeigt, daß die mit der Beschichtungsmasse in Berührung kommenden beweglichen Bauteile derartiger Auftragsysteme durch die abrasiven Korundpartikel in kürzester Zeit verschlissen werden.Operational practice has shown that the moving components of such application systems that come into contact with the coating material are worn out in a very short time by the abrasive corundum particles.
In einem Aufsatz von H. Peters, der in der Zeitschrift „Wochenblatt für Papierfabrikation" 6, 1973, 164 - 169 erschienen ist, wird u. a. ein Düsenauftrag- werk kurz beschrieben. Dabei ist eine Schlitzdüse von unten auf eine durchlaufende Kartonbahn gerichtet, die eine rotierende Walze im unteren Bereich haarnadelförmig umschlingt. In Bewegungsrichtung hinter der Düse ist ein Schaberblatt zum Glattstreichen der aufgetragenen Schicht und zum Entfernen überschüssiger Beschichtungsmasse angeordnet. Dem Aufsatz ist zu entnehmen, daß das Auftragwerk für Auftragmengen bis zu 25 bis 30 g/m2 geeignet ist und insbesondere bei hohen Geschwindigkeiten Vorteile bietet. Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Auftragen einer aus flüssigem Harz und feinkörnigem abrasivem Material, insbesondere Korund, bestehenden Beschichtungsmasse auf eine durchlaufende Papierbahn zu schaffen, die den folgenden Anforderungen genügt: Einerseits soll die Beschichtungsmasse in relativ dicker, gleichmäßiger Schicht aufgetragen werden, wie es bei Papieren erforderlich ist, die für die Herstellung von abriebfesten Laminaten bestimmt sind, insbesondere mit einer Auftragmenge von 80 bis 200 g/m2. Andererseits soll es weitgehend vermieden werden, daß teuere Maschinenteile einem übermäßigen Verschleiß durch die abrasiven Partikel ausgesetzt sind.In an article by H. Peters, which appeared in the magazine "Wochenblatt für Papierfabrikation" 6, 1973, 164-169, a nozzle applicator is briefly described, among other things A scraper blade is arranged behind the nozzle in the direction of movement to smooth the applied layer and to remove excess coating material. The article shows that the application unit is suitable for application quantities of up to 25 to 30 g / m 2 and offers advantages especially at high speeds. The invention has for its object to provide a device for applying a coating composition consisting of liquid resin and fine-grained abrasive material, in particular corundum, to a continuous paper web, which meets the following requirements: On the one hand, the coating composition should be applied in a relatively thick, uniform layer , as is required for papers intended for the production of abrasion-resistant laminates, in particular with an application amount of 80 to 200 g / m 2 . On the other hand, it should be largely avoided that expensive machine parts are exposed to excessive wear from the abrasive particles.
Diese Aufgabe wird durch die im Patentanspruch 1 angegebene Vorrichtung gelöst.This object is achieved by the device specified in claim 1.
Durch das Merkmal des Anspruchs 2 wird die Gleichmäßigkeit der aufgetragenen Schicht noch weiter verbessert.The feature of claim 2 improves the uniformity of the applied layer even further.
Gegenstand des Anspruchs 3 ist eine bevorzugte Ausbildung dieses Merkmals.The subject of claim 3 is a preferred embodiment of this feature.
Eine vorteilhafte Ausführungsform der Erfindung ist Gegenstand des Anspruchs 4 und insbesondere des Anspruchs 5.An advantageous embodiment of the invention is the subject of claim 4 and in particular of claim 5.
Durch das Merkmal des Anspruchs 6 wird erreicht, daß die auf die Dosierwalze aufgetragene Beschichtungsmasse wesentlich besser zu beobachten ist. Das erleichtert die Vordosierung. Da bei der Anordnung gemäß Anspruch 6 der Düsenschlitz unten liegt, kann mit niedrigem Pumpendruck gearbeitet werden. Das Absetzen von Partikeln in der Düse wird völlig vermieden.The feature of claim 6 ensures that the coating composition applied to the metering roller can be observed much better. This makes pre-dosing easier. Since in the arrangement according to claim 6 the nozzle slot is at the bottom, it is possible to work with a low pump pressure. The settling of particles in the nozzle is completely avoided.
Durch das Merkmal des Anspruchs 7 wird vermieden, daß im Stillstand der Maschine Beschichtungsmasse in den Walzenspalt läuft und die Umlenkwalze beschmiert.The feature of claim 7 prevents coating material from running into the nip when the machine is at a standstill and smearing the deflecting roller.
Die Zeichnung dient zur Veranschaulichung der Erfindung anhand der in Figur 1 bis Figur 3 schematisch dargestellten Ausführungsbeispiele. Eine Papierbahn 1 , die bereits mit Harz vorimprägniert, ggf. auch schon getrocknet ist, wird gemäß Figur 1 in waagerechter Richtung einer Umlenkwalze 2 zugeführt. Sie umschlingt die Umlenkwalze 2 im Bereich eines Bogens von 180°, der an der einen Seite durch die Auflauflinie 3, an der anderen Seite durch die Ablauflinie 4 begrenzt ist. Anschließend läuft sie in waagerechter Richtung, wie durch Pfeil 5 symbolisiert, zu einem nicht dargestellten Trockner.The drawing serves to illustrate the invention with reference to the exemplary embodiments shown schematically in FIGS. 1 to 3. A paper web 1, which has already been pre-impregnated with resin, possibly also already dried, is fed to a deflecting roller 2 in the horizontal direction according to FIG. It wraps around the deflecting roller 2 in the region of an arc of 180 °, which is delimited on one side by the run-up line 3 and on the other side by the run-off line 4. Then it runs in the horizontal direction, as symbolized by arrow 5, to a dryer, not shown.
Neben der Umlenkwalze 2 ist eine Dosierwalze 6 mit glattem Walzenmantel angeordnet. Sie hat bei dem 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 Maschinengestell gelagert. Die Lagerung einer der beiden Walzen 2, 6 ist in waagerechter Richtung parallel 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.In addition to the deflection roller 2, a metering roller 6 with a smooth roller jacket is arranged. In the exemplary embodiment, it has the same diameter as the deflecting roller 2. The axes of the deflecting roller 2 and the metering roller 6 are mounted parallel to one another at the same height in a machine frame. The mounting of one of the two rollers 2, 6 can be displaced in parallel in the horizontal direction, so that the width of the narrow gap existing between the two rollers 2, 6 is variable. The metering roller 6, like the deflection roller 2, is 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.
Unter der Umlenkwalze 2 ist eine Schlitzdüse 7 zum Auftragen der Beschichtungsmasse angeordnet. Der Düsenschlitz ist der Auflauflinie 3 benachbart.A slot nozzle 7 for applying the coating material is arranged under the deflection roller 2. The nozzle slot is adjacent to the ramp line 3.
Über der Umlenkwalze 2 ist eine mit dem Maschinengestell verbundene, zu den Achsen der beiden Walzen 2, 6 parallele Halteleiste 8 angeordnet. Daran ist die - in Richtung des Pfeiles 5 gesehen - rückwärtige Kante eines rechteckigen Lappens 9 aus flexiblem, gummiartigem Material befestigt, der sich über die gesamte Arbeitsbreite, d. h. Breite der zu beschichtenden Papierbahn 1 erstreckt. Die übrigen Kanten des rechteckigen Lappens 9 sind frei. Daher liegt ein streifenförmiger, der Halteleiste 8 gegenüberliegender Teil des schlaffen Lappens 9 lose auf dem von der Umlenkwalze 2 ablaufenden oberen Trum der Papierbahn 1 in der Nähe der Ablauflinie 4 auf. Die Länge des Lappens 9 - in Richtung des Pfeils 5 gesehen - liegt etwa zwischen 5 und 50 cm, vorzugsweise zwischen etwa 10 und 30 cm. Der Lappen 9 ist etwa 2 bis 5 mm dick. Im Betrieb läuft die Papierbahn 1 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 aufgetragen. Die so aufgetragene Schicht wird in dem engen Spalt zwischen Umlenkwalze 2 und Dosierwalze 6 gespalten, so daß ein Teil der Beschichtungsmasse an der Papierbahn haften bleibt, ein anderer Teil von der Dosierwalze 6 mitgeführt wird. Überschüssige Beschichtungsmasse wird im Spalt gestaut und tropft ab. Da die Oberflächengeschwindigkeiten der beiden Walzen 2, 6 zumindest annähernd übereinstimmen, verursachen die in der Beschichtungsmasse enthaltenen abrasiven Partikel keinen nennenswerten Verschleiß an der Dosierwalze 6.Arranged above the deflecting roller 2 is a holding strip 8 which is connected to the machine frame and is parallel to the axes of the two rollers 2, 6. Attached to this - seen in the direction of arrow 5 - is the rear edge of a rectangular flap 9 made of flexible, rubber-like material, which extends over the entire working width, ie the width of the paper web 1 to be coated. The remaining edges of the rectangular tab 9 are free. Therefore, a strip-shaped part of the slack flap 9 lying opposite the retaining strip 8 lies loosely on the upper run of the paper web 1 running off the deflecting roller 2 in the vicinity of the drain line 4. The length of the flap 9 - viewed in the direction of the arrow 5 - is approximately between 5 and 50 cm, preferably between approximately 10 and 30 cm. The flap 9 is about 2 to 5 mm thick. In operation, the paper web 1 runs at a speed between approximately 10 and 70 m / min, preferably between 20 and 50 m / min. With the slot nozzle 7, coating composition consisting of liquid resin and fine corundum particles suspended therein is applied in excess. The layer thus applied is split in the narrow gap between deflection roller 2 and metering roller 6, so that part of the coating composition sticks to the paper web and another part is carried along by the metering roller 6. Excess coating mass is stowed in the gap and drips off. Since the surface speeds of the two rollers 2, 6 match at least approximately, the abrasive particles contained in the coating material do not cause any significant wear on the metering roller 6.
Die an der Papierbahn 1 anhaftende Schicht - im Mittel etwa 80 bis 200 g/m2 - ist zunächst ungleichmäßig, so daß Längsstreifen deutlich sichtbar sind. Ihre Breite beträgt erfahrungsgemäß in der Regel etwa 5 mm. Der Abstand der Streifen voneinander liegt meistens zwischen etwa 10 und 30 mm. Das unerwünschteThe layer adhering to the paper web 1 - on average about 80 to 200 g / m 2 - is initially uneven, so that longitudinal stripes are clearly visible. Experience has shown that their width is usually around 5 mm. The distance between the strips is usually between about 10 and 30 mm. The unwanted
Streifenmuster ändert sich mitunter in unvorhersehbarer Weise. Es wird durch denStripe patterns sometimes change in an unpredictable way. It is through the
Lappen 9, der durch Friktionswirkung an der laufenden Papierbahn 1 leicht gespannt wird, egalisiert, so daß von den Streifen praktisch nichts mehr zu sehen ist. Dabei wird im stationären Zustand keine Beschichtungsmasse abgestreift. DerRag 9, which is slightly stretched by the friction effect on the running paper web 1, leveled, so that practically nothing is visible from the strips. No coating material is stripped off in the stationary state. The
Lappen 9 hat also lediglich eine vergleichmäßigende, aber keine dosierendeRag 9 thus has only a comparative, but no dosing
Wirkung. Er wird von den abrasiven Partikeln naturgemäß angegriffen und muß daher von Zeit zu Zeit erneuert werden. Die Erneuerung ist sehr einfach und verursacht keine nennenswerten Kosten.Effect. It is naturally attacked by the abrasive particles and must therefore be renewed from time to time. The renewal is very easy and does not cause any significant costs.
Von dem bisher beschriebenen Ausführungsbeispiei unterscheidet sich das in Figur 2 veranschaulichte Ausführungsbeispiel insbesondere dadurch, daß die Schlitzdüse 7 auf die Mantelfläche der Dosierwalze 6 gerichtet ist. Die auf die Dosierwalze 6 aufgetragene Beschichtungsmasse wird im Spalt zwischen den beiden Walzen 2, 6 teilweise auf die Papierbahn 1 übertragen. Im übrigen stimmen die beiden Ausführungsbeispiele soweit überein, daß weitere Erläuterungen der Figur 2 entbehrlich sind. 5The exemplary embodiment illustrated in FIG. 2 differs from the previously described exemplary embodiment in particular in that the slot nozzle 7 is directed onto the outer surface of the metering roller 6. The coating composition applied to the metering roller 6 is partially transferred to the paper web 1 in the gap between the two rollers 2, 6. Otherwise, the two exemplary embodiments correspond to such an extent that further explanations of FIG. 2 are unnecessary. 5
Bei dem in Figur 3 dargestellten Ausführungsbeispiel ist die Schlitzdüse 7 über der Dosierwalze 6 angeordnet, so daß die Beschichtungsmasse von oben aufgetragen wird. Sie ist zur Scheitellinie der Dosierwalze 6 in Drehrichtung etwas versetzt. In der Zeichnung ist sie etwa in der Elfuhr-Stellung dargestellt.In the embodiment shown in Figure 3, the slot nozzle 7 is arranged above the metering roller 6, so that the coating composition is applied from above. It is somewhat offset to the apex line of the metering roller 6 in the direction of rotation. In the drawing, it is shown approximately in the Elfuhr position.
Die Halteleiste 8 ist biegeeiastisch oder durch nachgiebige Befestigungselemente mit dem nicht dargestellten Maschinengestell verbunden, so daß sie relativ zum Maschinengestell kleine Bewegungen ausführen kann. Auf der Halteleiste 8 sitzt ein Druckluft-Turbinenvibrator 10. Er besteht im wesentlichen aus einem blockförmigen Gehäuse mit zylindrischem Hohlraum. In dem Hohlraum ist ein Rotor 11 drehbar gelagert, so daß seine Drehachse parallel zu der Halteleiste 8 ausgerichtet ist. Er ist mit einer Unwucht versehen, die in der Zeichnung symbolisch durch einen schwarz gefärbten Sektor angedeutet ist. Auf dem Mantel des Rotors sitzen -vergleichbar mit den Schaufeln einer Pelton-Turbine- radiale Rippen. In den Hohlraum des Vibrators münden auf gegenüberliegenden Seiten zwei Kanäle 12, 13, deren Achsen tangential zu dem Rotor 11 ausgerichtet ist. Der Kanal 12 ist mit einer Druckluftquelle verbunden. Der Kanal 13, der ggf. mit einem nicht dargestellten Schalldämpfer versehen ist, ist der Ausgang für die Abluft.The retaining bar 8 is flexible or connected by flexible fasteners to the machine frame, not shown, so that it can perform small movements relative to the machine frame. A compressed air turbine vibrator 10 sits on the holding bar 8. It essentially consists of a block-shaped housing with a cylindrical cavity. A rotor 11 is rotatably mounted in the cavity so that its axis of rotation is aligned parallel to the retaining strip 8. It is provided with an imbalance, which is symbolically indicated in the drawing by a black colored sector. Radial ribs sit on the jacket of the rotor, comparable to the blades of a Pelton turbine. Two channels 12, 13, the axes of which are oriented tangentially to the rotor 11, open into the cavity of the vibrator on opposite sides. The channel 12 is connected to a compressed air source. The duct 13, which may be provided with a silencer, not shown, is the outlet for the exhaust air.
Im Betrieb wird dem Vibrator 10 über den Kanal 12 Druckluft zugeführt. Dadurch wird der Rotor 11 in Umdrehung versetzt. Durch die Unwucht des Rotors 1 1 werden Kreisschwingungen erzeugt, die sich auf die Halteleiste 8 übertragen. Der Lappen 9 wird ebenfalls in Schwingungen versetzt. Die Frequenz der Schwingungen wird durch den Druck der zugeführten Luft bestimmt. Sie liegt vorzugsweise zwischen 100 und 200 Hz.In operation, the vibrator 10 is supplied with compressed air via the channel 12. As a result, the rotor 11 is rotated. Circular vibrations are generated by the imbalance of the rotor 1 1, which are transmitted to the retaining strip 8. The flap 9 is also set in vibration. The frequency of the vibrations is determined by the pressure of the air supplied. It is preferably between 100 and 200 Hz.
Überraschenderweise hat sich gezeigt, daß die egalisierende Wirkung des Lappens 9 durch die Schwingungen deutlich verbessert wird.Surprisingly, it has been shown that the leveling effect of the flap 9 is significantly improved by the vibrations.
Auf dem Weg zwischen der Schlitzdüse 7 und dem zwischen den beiden Walzen 2, 6 bestehenden Spalt sind Organe zum Vordosieren oder Glätten der von der Dosierwalze 6 mitgeführten Beschichtungsmasse nicht vorgesehen. On the way between the slot nozzle 7 and the gap existing between the two rollers 2, 6, organs for predosing or smoothing the coating mass carried by the metering roller 6 are not provided.

Claims

Patentansprüche claims
1. Vorrichtung zum Auftragen einer aus flüssigem Harz und feinkörnigem abrasivem Material, insbesondere Korund, bestehenden Beschichtungsmasse auf eine durchlaufende Papierbahn, die zur Verwendung bei der Herstellung abriebfester Laminate bestimmt ist,1. Device for applying a coating composition consisting of liquid resin and fine-grained abrasive material, in particular corundum, to a continuous paper web which is intended for use in the production of abrasion-resistant laminates.
mit einer Umlenkwalze (2), an der die Papierbahn (1) in einem Umschlingsbereich anliegt,with a deflection roller (2) against which the paper web (1) lies in a wrapping area,
mit einer Dosierwalze (6), die parallel zur Umlenkwalze (2) angeordnet ist, mit ihr einen engen Spalt einschließt und synchron oder annähernd synchron mit der Umlenkwalze (2) angetrieben ist,with a metering roller (6) which is arranged parallel to the deflection roller (2), encloses a narrow gap with it and is driven synchronously or approximately synchronously with the deflection roller (2),
mit einer Schlitzdüse (7) zum Auftragen der Beschichtungsmasse entweder direkt auf die an der Umlenkwalze (2) anliegende Papierbahn (1) oder auf die Dosierwalze (6)with a slot nozzle (7) for applying the coating composition either directly onto the paper web (1) lying against the deflection roller (2) or onto the metering roller (6)
und mit einer Rakel, bestehend im wesentlichen aus einem rechteckigen Lappenand with a squeegee consisting essentially of a rectangular rag
(9) aus einem flexiblen gummiartigen Material, der an seiner rückwärtigen, zu den Achsen der beiden Walzen (2, 6) parallelen Kante einseitig befestigt ist und schlaff auf dem von der Umlenkwalze (2) ablaufenden oberen Trum der Papierbahn (1) aufliegt.(9) made of a flexible rubber-like material, which is fastened on one side at its rear edge parallel to the axes of the two rollers (2, 6) and lies slack on the upper run of the paper web (1) running off the deflection roller (2).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß der Lappen (9) an einer Halteleiste (8) befestigt ist, welche in Schwingungen versetzbar ist.2. Apparatus according to claim 1, characterized in that the tab (9) is attached to a retaining strip (8) which can be set in vibration.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Schwingungen in einer Ebene erfolgen, zu der die Halteleiste (8) rechtwinklig angeordnet ist.3. Apparatus according to claim 2, characterized in that the vibrations take place in a plane to which the retaining strip (8) is arranged at right angles.
4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß auf der Halteieiste (8) ein Vibrator (10) mit rotierender Unwucht sitzt. 4. Apparatus according to claim 2 or 3, characterized in that a vibrator (10) with rotating unbalance sits on the holding strip (8).
5. Vorrichtung nach Anspruch 4, gekennzeichnet durch einen Druckluft- Turbinenvibrator (10).5. The device according to claim 4, characterized by a compressed air turbine vibrator (10).
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Schlitzdüse (7) von oben auf die Dosierwaize (6) gerichtet ist.6. Device according to one of claims 1 to 5, characterized in that the slot nozzle (7) is directed from above onto the metering roller (6).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Schlitzdüse (7) relativ zur Scheitellinie der Dosierwalze (6) in Drehrichtung der Dosierwalze versetzt ist. 7. The device according to claim 6, characterized in that the slot nozzle (7) is offset relative to the apex line of the metering roller (6) in the direction of rotation of the metering roller.
EP99917837A 1998-03-31 1999-03-23 Device for applying a coating substance to a continuous paper web Expired - Lifetime EP1084298B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE1998114212 DE19814212C1 (en) 1998-03-31 1998-03-31 Apparatus to apply an abrasive coating mass to a moving paper web surface
DE19814212 1998-03-31
DE19825156A DE19825156C1 (en) 1998-03-31 1998-06-05 Device for applying a coating material to a continuous paper web
DE19825156 1998-06-05
PCT/EP1999/001946 WO1999050501A1 (en) 1998-03-31 1999-03-23 Device for applying a coating substance to a continuous paper web

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EP1084298A1 true EP1084298A1 (en) 2001-03-21
EP1084298B1 EP1084298B1 (en) 2003-06-04

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US (1) US6432201B1 (en)
EP (1) EP1084298B1 (en)
AT (1) ATE242357T1 (en)
CA (1) CA2326527C (en)
DE (2) DE19825156C1 (en)
ES (1) ES2201706T3 (en)
PT (1) PT1084298E (en)
WO (1) WO1999050501A1 (en)

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ATE254692T1 (en) 1999-01-26 2003-12-15 Kronospan Tech Co Ltd METHOD FOR IMPREGNATION OF DECORATIVE PAPERS
RU2226285C2 (en) * 2000-07-11 2004-03-27 ОПТИВА, Инк. Gear to form polarizer, device for local removal of polarizer film and production line to form polarizers
EP1174738A3 (en) * 2000-07-11 2004-05-26 Optiva, Inc. Technological machinery for production of polarizers
US6818062B2 (en) * 2001-10-29 2004-11-16 Fuji Photo Film Co., Ltd. Coating method and apparatus
US6582769B2 (en) * 2001-11-28 2003-06-24 Meadwestvaco Corporation Method for conditioning a metering blade
US6942904B2 (en) * 2001-12-11 2005-09-13 Ultra Technology Europe Ab Dry end surface treatment using ultrasonic transducers
DE102004063043B3 (en) * 2004-12-22 2006-07-20 Vits Systems Gmbh Apparatus for applying a coating composition to a paper web
JP4536555B2 (en) * 2005-03-02 2010-09-01 三菱電機株式会社 Search display device
TWI453071B (en) 2011-08-03 2014-09-21 Nat Univ Chung Cheng Coating thickness adjustment device
CN104907221A (en) * 2015-06-21 2015-09-16 李亚光 Coating system and coating method

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EP1084298B1 (en) 2003-06-04
WO1999050501A1 (en) 1999-10-07
DE59905852D1 (en) 2003-07-10
US6432201B1 (en) 2002-08-13
ES2201706T3 (en) 2004-03-16
DE19825156C1 (en) 1999-10-07
CA2326527C (en) 2004-06-22
ATE242357T1 (en) 2003-06-15
PT1084298E (en) 2003-10-31
CA2326527A1 (en) 1999-10-07

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