EP0658651A1 - Blade for coating webs of paper or cardboard - Google Patents

Blade for coating webs of paper or cardboard Download PDF

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Publication number
EP0658651A1
EP0658651A1 EP94117721A EP94117721A EP0658651A1 EP 0658651 A1 EP0658651 A1 EP 0658651A1 EP 94117721 A EP94117721 A EP 94117721A EP 94117721 A EP94117721 A EP 94117721A EP 0658651 A1 EP0658651 A1 EP 0658651A1
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EP
European Patent Office
Prior art keywords
lamellae
doctor blade
blade according
coated
curvature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94117721A
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German (de)
French (fr)
Inventor
Friedhelm Ruhl
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.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0658651A1 publication Critical patent/EP0658651A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a doctor blade according to the preamble of claim 1.
  • a doctor blade is known from DE 38 39 564. With this doctor blade, individual lamellae of different diameters are alternately fastened next to one another on a carrier rod. This construction gives a doctor rod which corresponds essentially to known doctor rods with circumferential grooves. The application takes place with a drive which drives the doctor rod in the opposite direction or in the same direction to the web running direction or running direction of the surface to be coated.
  • doctor blades are of course subject to considerable wear, so that the larger diameter fins are made from a harder material.
  • doctor blades in the form of coating blades (leaf springs) which can be adjusted by means of adjusting means in their contact pressure and the angle of attack against the web or the surface to be coated.
  • the object of the invention is to form a doctor blade that is variable in terms of setting, which can be exchanged relatively easily and which is also relatively inexpensive.
  • doctor rod constructed according to the invention Due to the doctor rod constructed according to the invention, the usual volumetric metering option is the same as for grooved ones Doctor rod still given. Another great advantage is that you can change the configuration during operation and thus vary the dosage, for example. Worn doctor blades can be replaced simply by changing the doctor blades.
  • FIG. 1 showing a cross section
  • FIG. 2 a partial view of the doctor carrier.
  • a squeegee holder 4 holds a carrier 2, which is essentially a long plate, the length being formed in the usual way according to the width of the paper web. It has individual slots 8, in which slats 1 are guided, which are relatively thin and easily deformable, which is done here by a pressure hose 6. This presses on the individual lamellae via a pressure piece 7, whereby it acts essentially centrally on the latter.
  • the slats 1 are convexly curved, protrude from the slots 8 in their central region and rest on the web W.
  • the surface of the carrier 2 facing the web W can also have a slight curvature, at least in the region where the lamellae 1 protrude from the slots 8.
  • the radius of curvature of the lamellas in operation namely their surface facing the web W, can be between a minimum of 12, generally 25 and 200 mm, in order to meet practical requirements.
  • the curvature of the carrier 2 on this side can be between 100 and 400 mm, the curvature meaning the radius R1 or R2.
  • the surface of the carrier 2 facing the web W can of course be be even in the area of the slats.
  • the pressure piece has a projection 9, by means of which it engages in a groove 5 of the doctor blades 1.
  • the slats can be made of highly wear-resistant material, e.g. made from a carbide or an oxide.
  • 2 shows the grooves or metering channels 12 formed between the lamellae 1, which are used for volumetric metering of the coating slip.
  • the groove thickness (of the spaces or metering channels 12) is approximately between 0.1 and 0.6 mm in terms of width and between 0.1 and 0.3 mm in terms of maximum height. However, these values can also be exceeded considerably - e.g. up to more than 1 mm wide - or even slightly less - e.g. up to 0.05 mm -. These values are to be measured according to practical requirements.
  • a pressure chamber could also be provided behind the slats 1 and the support 2.
  • the lamellae can be formed from thin sheet metal.
  • the fins can be straight and are deformed by the pressure hose 6 or by the internal pressure in the holder 4.

Abstract

The applicator assembly has a longitudinal carrier (2) secured in a holder (4). It is fitted with slits (8) along the lines of the dosing groove channels (12), to take thin blades (1) to define the dosing channels (12) between them. The blades (1) have a curved shape or form a curve, with their convex sides forming the laying surface against the web or roller to be coated.

Description

Die Erfindung betrifft eine Rakel entsprechend dem Oberbegriff des Patentanspruchs 1. Eine solche Rakel ist bekannt aus DE 38 39 564. Bei dieser Rakel werden einzelne Lamellen verschiedenen Durchmessers abwechselnd nebeneinander auf einem Trägerstab befestigt. Durch diesen Aufbau erhält man einen Rakelstab, der im wesentlichen bekannten Rakelstäben mit Umfangsrillen entspricht. Die Anwendung erfolgt dabei mit einem Antrieb, der den Rakelstab gegensinnig oder auch gleichsinnig zur Bahnlaufrichtung bzw. Laufrichtung der zu beschichtenden Oberfläche antreibt.The invention relates to a doctor blade according to the preamble of claim 1. Such a doctor blade is known from DE 38 39 564. With this doctor blade, individual lamellae of different diameters are alternately fastened next to one another on a carrier rod. This construction gives a doctor rod which corresponds essentially to known doctor rods with circumferential grooves. The application takes place with a drive which drives the doctor rod in the opposite direction or in the same direction to the web running direction or running direction of the surface to be coated.

Diese Rakelstäbe unterliegen natürlich einem erheblichen Verschleiß, so daß man die Lamellen größeren Durchmessers aus einem härteren Material herstellt.These doctor blades are of course subject to considerable wear, so that the larger diameter fins are made from a harder material.

Andererseits gibt es Rakel in Form von Streichblättern (Blattfedern), die durch Einstellmittel in ihrer Anpreßkraft und dem Anstellwinkel an die Bahn bzw. die zu beschichtende Oberfläche eingestellt werden können.On the other hand, there are doctor blades in the form of coating blades (leaf springs) which can be adjusted by means of adjusting means in their contact pressure and the angle of attack against the web or the surface to be coated.

Beide Rakelelemente unterliegen wie gesagt dem Verschleiß und müssen öfter ausgetauscht werden, wobei der Rollrakelstab relativ teuer ist.As said, both doctor elements are subject to wear and have to be replaced more often, the roller doctor rod being relatively expensive.

Die Aufgabe der Erfindung ist es, eine hinsichtlich Einstellung variable Rakel zu bilden, deren Austausch relativ einfach erfolgen kann und die auch relativ preisgünstig ist.The object of the invention is to form a doctor blade that is variable in terms of setting, which can be exchanged relatively easily and which is also relatively inexpensive.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst.This object is achieved by the features of the characterizing part of patent claim 1.

Durch den erfindungsgemäß aufgebauten Rakelstab ist die übliche volumetrische Dosiermöglichkeit wie beim gerillten Rakelstab weiterhin gegeben. Als großer Vorteil kommt hinzu, daß man während des Betriebes die Konfiguration verändern und somit z.B. die Dosiermenge variieren kann. Der Austausch abgenutzter Rakelstäbe kann einfach durch Auswechseln der Rakellamellen erfolgen.Due to the doctor rod constructed according to the invention, the usual volumetric metering option is the same as for grooved ones Doctor rod still given. Another great advantage is that you can change the configuration during operation and thus vary the dosage, for example. Worn doctor blades can be replaced simply by changing the doctor blades.

Nachfolgend wird die Erfindung anhand des in den Figuren dargestellten Beispiels erläutert, wobei Figur 1 einen Querschnitt und Figur 2 eine Teilansicht des Rakelträgers darstellen.The invention is explained below with reference to the example shown in the figures, FIG. 1 showing a cross section and FIG. 2 a partial view of the doctor carrier.

In einem Rakelhalter 4 ist ein Träger 2 gehalten, der im wesentlichen eine lange Platte ist, wobei die Länge ja in der üblichen Weise entsprechend der Breite der Papierbahn ausgebildet ist. Er weist einzelne Schlitze 8 auf, in denen Lamellen 1 geführt sind, die relativ dünn und leicht verformbar sind, was hier durch einen Druckschlauch 6 erfolgt. Dieser drückt über ein Anpreßstück 7 auf die einzelnen Lamellen, wobei es im wesentlichen mittig an diesen angreift. Die Lamellen 1 sind konvex gewölbt, ragen in ihrem mittleren Bereich aus den Schlitzen 8 heraus und liegen an der Bahn W an. Dies könnte auch eine zu beschichtende Walze sein, welche an anderer Stelle von der zu beschichtenden Bahn umschlungen ist, oder die über einen mit einer weiteren Walze gebildeten Preßspalt die Beschichtungsmasse auf die Bahn drückt. Die der Bahn W zugewandte Oberfläche des Trägers 2 kann auch eine leichte Krümmung, zumindest in dem Bereich, wo die Lamellen 1 aus den Schlitzen 8 herausragen, aufweisen.A squeegee holder 4 holds a carrier 2, which is essentially a long plate, the length being formed in the usual way according to the width of the paper web. It has individual slots 8, in which slats 1 are guided, which are relatively thin and easily deformable, which is done here by a pressure hose 6. This presses on the individual lamellae via a pressure piece 7, whereby it acts essentially centrally on the latter. The slats 1 are convexly curved, protrude from the slots 8 in their central region and rest on the web W. This could also be a roller to be coated, which is wrapped elsewhere by the web to be coated, or which presses the coating composition onto the web via a press nip formed with another roller. The surface of the carrier 2 facing the web W can also have a slight curvature, at least in the region where the lamellae 1 protrude from the slots 8.

Der Krümmungsradius der Lamellen im Betrieb, und zwar deren der Bahn W zugewandte Fläche, kann zwischen minimal 12, allgemein 25 und 200 mm liegen, um den praktischen Bedürfnissen zu entsprechen. Ebenso kann die Krümmung des Trägers 2 an dieser Seite zwischen 100 und 400 mm betragen, wobei mit Krümmung der Radius R1 bzw. R2 gemeint ist. Die der Bahn W zugewandte Fläche des Trägers 2 kann natürlich auch im Bereich der Lamellen eben sein. Das Anpreßstück weist einen Vorsprung 9 auf, mittels dem es in eine Nut 5 der Rakellamellen 1 eingreift.The radius of curvature of the lamellas in operation, namely their surface facing the web W, can be between a minimum of 12, generally 25 and 200 mm, in order to meet practical requirements. Likewise, the curvature of the carrier 2 on this side can be between 100 and 400 mm, the curvature meaning the radius R1 or R2. The surface of the carrier 2 facing the web W can of course be be even in the area of the slats. The pressure piece has a projection 9, by means of which it engages in a groove 5 of the doctor blades 1.

Man kann die Lamellen aus hochverschleißfestem Material, z.B. aus einem Karbid oder einem Oxid herstellen. Man erkennt aus Figur 2 die zwischen den Lamellen 1 gebildeten Rillen oder Dosierkanäle 12, die zur volumetrischen Dosierung der Streichmasse dienen. Die Rillenstärke (der Zwischenräume oder Dosierkanäle 12) liegt etwa zwischen 0,1 und 0,6 mm hinsichtlich der Breite und zwischen 0,1 und 0,3 mm hinsichtlich der maximalen Höhe. Diese Werte können aber auch noch erheblich überschritten - z.B. bis mehr als 1 mm Breite - oder auch etwas unterschritten werden - z.B. bis 0,05 mm -. Diese Werte sind nach den praktischen Erfordernissen zu bemessen.The slats can be made of highly wear-resistant material, e.g. made from a carbide or an oxide. 2 shows the grooves or metering channels 12 formed between the lamellae 1, which are used for volumetric metering of the coating slip. The groove thickness (of the spaces or metering channels 12) is approximately between 0.1 and 0.6 mm in terms of width and between 0.1 and 0.3 mm in terms of maximum height. However, these values can also be exceeded considerably - e.g. up to more than 1 mm wide - or even slightly less - e.g. up to 0.05 mm -. These values are to be measured according to practical requirements.

Anstatt des Druckschlauches 6 könnte auch eine Druckkammer hinter den Lamellen 1 und dem Träger 2 vorgesehen sein. Die Lamellen können aus dünnem Blech gebildet sein. Die Lamellen können im Prinzip gerade sein und werden durch den Druckschlauch 6 bzw. durch den Innendruck im Halter 4 verformt.Instead of the pressure hose 6, a pressure chamber could also be provided behind the slats 1 and the support 2. The lamellae can be formed from thin sheet metal. In principle, the fins can be straight and are deformed by the pressure hose 6 or by the internal pressure in the holder 4.

Claims (7)

Rakel, insbesondere zum Streichen von Papier oder Karton, mit einer Längsachse und Dosierrillen (Dosierkanäle 12), die sich quer zur Längsachse erstrecken, das einzelne, aneinander gereihte, durch eine Vorrichtung zusammengehaltene Einzelelemente (1) aufweist, dadurch gekennzeichnet, daß ein länglicher, in einem Halter (4) fixierbarer Träger (2) vorgesehen ist, der entsprechend der Rillenverlaufsrichtung Schlitze (8) aufweist, in denen dünne Lamellen (1) fixierbar sind, um die Rillen (Dosierkanäle 12) durch die Zwischenräume zwischen ihnen zu bilden, und daß die Lamellen (1) eine gewölbte Form haben oder erhalten, um mit ihrer konvexen Seite die Anlagefläche an der zu beschichtenden Oberfläche (Bahn oder diese führenden Walze) zu bilden.Squeegee, in particular for coating paper or cardboard, with a longitudinal axis and metering grooves (metering channels 12) which extend transversely to the longitudinal axis and which has individual, lined up individual elements (1) held together by a device, characterized in that an elongated, in a holder (4) fixable support (2) is provided, which has slots (8) according to the direction of the groove, in which thin lamellae (1) can be fixed in order to form the grooves (metering channels 12) through the spaces between them, and that the lamellae (1) have or receive a curved shape in order to form with their convex side the contact surface on the surface to be coated (web or roller carrying this). Rakel nach Anspruch 1, dadurch gekennzeichnet, daß der Träger (2) eine konvexe Wölbung zumindest in seinem mittleren Bereich, wo im wesentlichen die Lamellen (1) aus den Schlitzen (8) herausragen, vorgesehen ist.Doctor blade according to claim 1, characterized in that the carrier (2) is provided with a convex curvature at least in its central region, where the lamellae (1) essentially protrude from the slots (8). Rakel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Wölbung der Lamellen (1) mit einem Radius zwischen 0 und 200 mm gebildet ist.Doctor blade according to claim 1 or 2, characterized in that the curvature of the lamellae (1) is formed with a radius between 0 and 200 mm. Rakel nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß die Wölbung des Trägers (2) mit einem Radius zwischen 100 und ∞, vorzugsweise zwischen 100 und 400 mm gebildet ist.Doctor blade according to one of claims 1-3, characterized in that the curvature of the carrier (2) is formed with a radius between 100 and ∞, preferably between 100 and 400 mm. Rakel nach einem der Ansprüche 1-4, gekennzeichnet durch ein Anpreßstück (7) zum Führen bzw. Halten und Anpressen der Lamellen (1) an die zu beschichtende Oberfläche.Doctor blade according to one of claims 1-4, characterized by a pressure piece (7) for guiding or holding and pressing the lamellae (1) against the surface to be coated. Rakel nach Anspruch 5, dadurch gekennzeichnet, daß das Anpreßstück (7) an den Lamellen mittig, d.h. im Mittelbereich der Wölbung angreift.Doctor blade according to claim 5, characterized in that the contact piece (7) is centered on the lamellae, i.e. attacks in the middle of the arch. Rakel nach einem der Ansprüche 1-6, dadurch gekennzeichnet, daß ein Druckschlauch (6) im Halter (4) vorgesehen ist, der auf das Anpreßstück zum Anpressen der Lamellen (1) an die zu beschichtende Oberfläche einwirkt.Squeegee according to one of claims 1-6, characterized in that a pressure hose (6) is provided in the holder (4), which acts on the pressure piece for pressing the lamellae (1) onto the surface to be coated.
EP94117721A 1993-11-29 1994-11-10 Blade for coating webs of paper or cardboard Withdrawn EP0658651A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934340578 DE4340578C2 (en) 1993-11-29 1993-11-29 Squeegee for coating webs of paper or cardboard
DE4340578 1993-11-29

Publications (1)

Publication Number Publication Date
EP0658651A1 true EP0658651A1 (en) 1995-06-21

Family

ID=6503680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94117721A Withdrawn EP0658651A1 (en) 1993-11-29 1994-11-10 Blade for coating webs of paper or cardboard

Country Status (5)

Country Link
EP (1) EP0658651A1 (en)
JP (1) JPH07195021A (en)
CA (1) CA2136806A1 (en)
DE (1) DE4340578C2 (en)
FI (1) FI945577A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4402226C2 (en) * 1994-01-27 1997-11-06 Voith Gmbh J M Doctor device
DE29621876U1 (en) * 1996-12-17 1997-02-13 Voith Sulzer Papiermasch Gmbh Doctor device
DE19711728A1 (en) * 1997-03-20 1998-09-24 Voith Sulzer Papiermasch Gmbh Papermaking doctor blade
US6192597B1 (en) 1997-04-17 2001-02-27 Voith Sulzer Papiermaschinen Gmbh Device for treating a fibrous pulp web as well as a sealing device for a device of this kind
DE19729663A1 (en) * 1997-07-11 1999-01-14 Voith Sulzer Papiermasch Gmbh Doctor blade device for applying liquid or paste
DE19817202A1 (en) * 1998-04-17 1999-10-21 Voith Sulzer Papiertech Patent Seal for the press or drying station of a paper making machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB697512A (en) * 1950-11-09 1953-09-23 Asea Ab Apparatus for coating smooth surfaces with liquids
DE3438643A1 (en) * 1983-10-22 1985-05-02 Konishiroku Photo Industry Co., Ltd., Tokio/Tokyo METHOD FOR SMOOTHING A COATING AND DEVICE FOR CARRYING OUT THIS METHOD
DE3931793A1 (en) * 1988-09-27 1990-03-29 Btg Kaelle Inventing Ab A DEVICE FOR COATING A DRIVING TRAIN
DE3839564A1 (en) * 1988-11-24 1990-05-31 Jagenberg Ag Doctor shaft for the volumetric metering out of coating material

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8232839U1 (en) * 1982-11-23 1984-06-14 Jagenberg AG, 4000 Düsseldorf DEVICE FOR COATING CONTINUOUS MATERIALS

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB697512A (en) * 1950-11-09 1953-09-23 Asea Ab Apparatus for coating smooth surfaces with liquids
DE3438643A1 (en) * 1983-10-22 1985-05-02 Konishiroku Photo Industry Co., Ltd., Tokio/Tokyo METHOD FOR SMOOTHING A COATING AND DEVICE FOR CARRYING OUT THIS METHOD
DE3931793A1 (en) * 1988-09-27 1990-03-29 Btg Kaelle Inventing Ab A DEVICE FOR COATING A DRIVING TRAIN
DE3839564A1 (en) * 1988-11-24 1990-05-31 Jagenberg Ag Doctor shaft for the volumetric metering out of coating material

Also Published As

Publication number Publication date
CA2136806A1 (en) 1995-05-30
DE4340578A1 (en) 1994-05-26
JPH07195021A (en) 1995-08-01
FI945577A (en) 1995-05-30
DE4340578C2 (en) 1995-03-30
FI945577A0 (en) 1994-11-28

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