EP0423492A2 - Metering device for metering coatings for paper or cardboard webs - Google Patents

Metering device for metering coatings for paper or cardboard webs Download PDF

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Publication number
EP0423492A2
EP0423492A2 EP90117799A EP90117799A EP0423492A2 EP 0423492 A2 EP0423492 A2 EP 0423492A2 EP 90117799 A EP90117799 A EP 90117799A EP 90117799 A EP90117799 A EP 90117799A EP 0423492 A2 EP0423492 A2 EP 0423492A2
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EP
European Patent Office
Prior art keywords
squeegee
ribs
width
trailing edge
paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90117799A
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German (de)
French (fr)
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EP0423492B1 (en
EP0423492A3 (en
Inventor
Rudolf Beisswanger
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JM Voith GmbH
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JM Voith GmbH
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Priority to AT90117799T priority Critical patent/ATE98528T1/en
Publication of EP0423492A2 publication Critical patent/EP0423492A2/en
Publication of EP0423492A3 publication Critical patent/EP0423492A3/en
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    • 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
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters

Definitions

  • the invention relates to a doctor blade according to the preamble of claim 1.
  • a doctor blade is known from US Pat. No. 4,279,949.
  • a strip-shaped doctor body is provided, which is pivotally mounted around the contact pressure of its sharp wiping edge at the end of the doctor body to be able to adjust.
  • This doctor blade body can be provided with a wear-resistant surface, in particular made of carbide material.
  • squeegees with an irregular cross-section in cross section perpendicular to the longitudinal extent of the squeegee strip and an arcuate squeegee surface are known from EP-A 0109520 and DE-OS 36 20 374.
  • either the squeegee surface or the entire squeegee strip should consist of ceramic, in particular oxide-ceramic material, because the latter is particularly wear-resistant.
  • the squeegee devices known from the first two publications were based on the idea that a uniform, abrupt trailing edge at the end of the squeegee surface of the squeegee bar could ensure the uniformity of the coating application even with changing contact pressures.
  • the doctor surface was very smooth.
  • the object of the invention is to make it possible in the known devices mentioned at the outset, by means of a specific groove shape, to achieve a good metering possibility with extremely even stroke application, even with squeegee strips with an irregular cross section.
  • the squeegee 1 As is customary in doctor squeegee rods guided in squeegee beds, is carried by a retaining blade or retaining leaf spring 2. It can be pressed against the counter-roller C and thus against the paper or cardboard web guided by a pressure bar or other pressure means, which act on the squeegee bar or the leaf spring in this specified area.
  • the radius of the counter roll C is indicated by R w and the radius of curvature of the arcuate doctor surface by R.
  • the squeegee surface consists of nothing but side by side arranged grooves 3, between which there are ribs 4. In this case, the ribs end in a flat roof surface 5 of width b.
  • these ribs narrow towards the trailing edge 7 of the squeegee strip 1, where their expansion is zero, ie they disappear.
  • a rounding radius R2 is provided for this. It can be seen from FIG. 1 that the grooves 3 flatten out towards the trailing edge, specifically a value between 10 and 25% of the normal height of the ribs 4 being provided for this.
  • For the rounding radius R1 applies approximately that it is between 3 and 30 mm, and it can generally R1 between 10 and 35% of the rounding radius R of the squeegee surface or between 5 and 30% of the diameter of the counter-roller after the point of their closest distance to the paper web or whose guide element is C.
  • the absolute values for the rib height a are 0.3 to 3 mm and for the rib width b 0.4 to 8 mm; A technology is to be aimed at that allows lower limit values of 0.1 mm. The same dimension ranges also apply to the corresponding groove width c.
  • the radius R of the doctor surface is at least 0.02 times, preferably between 0.1 and 0.2 times the radius R w of the counter roll C guiding the paper or cardboard web.
  • the trailing edge 7 of the doctor blade is located at a distance between 0 and 10 mm, preferably 0 and 6 mm, from the closest point of the doctor blade surface with respect to the paper web or the guide element C supporting it.
  • the selected shape of the groove ensures that a uniform line application is produced across the paper, that is, seen along the web width.
  • the ribs 3 end at the point of contact or the point of closest distance to the counter-roller C.
  • the grooves 3 at the end that is to say in the region of the run-off edge 7 ', are substantially widened and the coating is smoothed evenly by the run-off edge 7'.
  • the radius of curvature R1 continues, with which the grooves flatten from their base towards the trailing edge 7 'to the latter.
  • the squeegee 1 ⁇ is guided in the groove 13 of a compact squeegee holder 11.
  • a pressure hose 12 is provided for pressing the squeegee against the counter roll C.
  • a squeegee with a grooved surface is a metering coating element with which a relatively precisely metered amount can be applied to the paper web. Due to the protrusion, by pivoting the curved squeegee surface formed by the ribs and grooves, the wear of the ribs, which cannot be completely avoided even in the case of ceramic-coated grooves, can be somewhat compensated for. This compensation option is reinforced by the rounding radius R1.

Abstract

In a squeegee device, a squeegee is provided which is constructed as an elongate blade strip 1' which, from the cross-section transversely to its longitudinal extent, has an irregular cross-section and an arcuate blade surface which is provided with channels 3 as metering channels which extend transversely or perpendicularly to the longitudinal extent of the strip. The channels flatten out by 10 to 25 % of their normal height from their base towards the run-off edge 7 of the blade strip 1', preferably in an arcuate shape. In addition, they broaden out in this area so that the ribs provided between the channels disappear. Preferably, the blade strip consists of oxide-ceramic material or has a layer of such material on its coating surface 5. <IMAGE>

Description

Die Erfindung betrifft eine Rakel entsprechend dem Oberbegriff des Patentanspruchs 1. Eine solche Rakel ist bekannt aus der US-PS 42 79 949. Bei dieser Rakel ist ein leistenförmiger Ra­kelkörper vorgesehen, der schwenkbar gelagert ist, um den An­preßdruck seiner scharfen Abstreifkante am Ablaufende des Ra­kelkörpers einstellen zu können. Dieser Rakelkörper kann mit einer verschleißfesten, insbesondere aus karbidischem Material bestehenden Oberfläche versehen sein. Weitere solcher Rakeln mit im Querschnitt senkrecht zur Längserstreckung der Rakel­leiste unregelmäßigem Querschnitt und bogenförmiger Rakelfläche sind bekannt aus EP-A 0109520 und DE-OS 36 20 374. Auch hier soll entweder die Rakelfläche oder die gesamte Rakelleiste aus keramischem, insbesondere oxydkeramischem Material bestehen, weil letzteres besonders verschleißfest ist.The invention relates to a doctor blade according to the preamble of claim 1. Such a doctor blade is known from US Pat. No. 4,279,949. In this doctor blade, a strip-shaped doctor body is provided, which is pivotally mounted around the contact pressure of its sharp wiping edge at the end of the doctor body to be able to adjust. This doctor blade body can be provided with a wear-resistant surface, in particular made of carbide material. Further such squeegees with an irregular cross-section in cross section perpendicular to the longitudinal extent of the squeegee strip and an arcuate squeegee surface are known from EP-A 0109520 and DE-OS 36 20 374. Here too, either the squeegee surface or the entire squeegee strip should consist of ceramic, in particular oxide-ceramic material, because the latter is particularly wear-resistant.

Den aus den beiden zuerstgenannten Veröffentlichungen bekannten Rakeleinrichtungen lag die Vorstellung zugrunde, daß man mit­tels einer scharfen, abrupten Ablaufkante am Ende der Rakel­fläche der Rakelleiste auch bei wechselnden Anpreßdrücken die Gleichmäßigkeit des Strichauftrages gewährleisten könnte. Bei allen genannten Veröffentlichungen war die Rakelfläche sehr glatt ausgeführt.The squeegee devices known from the first two publications were based on the idea that a uniform, abrupt trailing edge at the end of the squeegee surface of the squeegee bar could ensure the uniformity of the coating application even with changing contact pressures. In all of the publications mentioned, the doctor surface was very smooth.

Es ist aber von antreibbaren, kreiszylindrischen Rakelstäben bekannt, mittels Umfangsrillen eine genaue Dosiermöglichkeit der Rakeleinrichtung zu schaffen.However, it is known from drivable, circular-cylindrical doctor blades to create a precise metering possibility of the doctor device by means of circumferential grooves.

Die Aufgabe der Erfindung ist es, bei den eingangs genannten, bekannten Einrichtungen durch eine bestimmte Rillenformgebung es zu ermöglichen, auch bei Rakelleisten mit unregelmäßigem Querschnitt eine gute Dosiermöglichkeit bei äußerst gleichmäßi­gem Strichauftrag zu erreichen.The object of the invention is to make it possible in the known devices mentioned at the outset, by means of a specific groove shape, to achieve a good metering possibility with extremely even stroke application, even with squeegee strips with an irregular cross section.

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.

Nachfolgend wird die Erfindung anhand zwei in den Figuren der Zeichnung dargestellter Ausführungsbeispiele erläutert, wobei

  • Fig. 1 einen Querschnitt durch eine erfindungsgemäße Ra­kelleiste,
  • Fig. 2 einen Längsschnitt entsprechend der Angabe "A" in Fig. 1,
  • Fig. 3 eine Ansicht entsprechend der Angabe in Fig.1
  • Fig. 4 einen der Fig. 1 entsprechenden Querschnitt einer anderen Ausführungsform einer erfindungsgemäßen Rakelleiste,
  • Fig. 5 eine Ansicht zu Fig. 4 entsprechend Angabe "B" in Fig. 4 und
  • Fig. 6 eine andere Befestigungsart der erfindungsgemäßen Rakelleiste
darstellen.The invention is explained below with reference to two exemplary embodiments shown in the figures of the drawing, wherein
  • 1 shows a cross section through a squeegee according to the invention,
  • 2 shows a longitudinal section corresponding to the indication "A" in Fig. 1,
  • Fig. 3 is a view corresponding to the information in Fig.1
  • 4 shows a cross section corresponding to FIG. 1 of another embodiment of a doctor blade according to the invention,
  • Fig. 5 is a view of Fig. 4 corresponding to "B" in Fig. 4 and
  • Fig. 6 shows another type of attachment of the squeegee according to the invention
represent.

In Fig. 1 wird die Rakelleiste 1, wie es bei in Rakelbetten ge­führten Rakelrundstäben üblich ist, von einer Halteklinge bzw. Halteblattfeder 2 getragen. Sie kann durch eine strichpunktiert dargestellte Druckleiste oder andere Druckmittel, die etwa in diesem angegebenen Bereich an der Rakelleiste oder an der Blattfeder angreifen, an die Gegenwalze C und somit an die von dieser geführten Papier- bzw. Kartonbahn angepreßt werden. In dieser Figur ist der Radius der Gegenwalze C mit Rw und der Krümmungsradius der bogenförmigen Rakelfläche mit R angegeben. Gemäß Fig. 2 besteht die Rakelfläche aus lauter nebeneinander angeordneten Rillen 3, zwischen denen sich Rippen 4 befinden. Die Rippen enden in diesem Fall in einer ebenen Dachfläche 5 der Breite b. Gemäß Fig. 3 verschmälern sich diese Rippen zur Ablaufkante 7 der Rakelleiste 1 hin, wo ihr Ausdehnung gleich Null ist, d.h. sie verschwinden. Es ist hierfür ein Abrundungs­radius R₂ vorgesehen. Man erkannt aus Fig. 1, daß sich die Ril­len 3 zur Ablaufkante hin verflachen, und zwar ist hierfür ein Wert zwischen 10 und 25 % der normalen Höhe der Rippen 4 vorge­sehen. Für den Abrundungsradius R₁ gilt etwa, daß er zwischen 3 und 30 mm beträgt, und er kann allgemein R1 zwischen 10 und 35 % des Abrundungsradius R der Rakelfläche oder zwischen 5 und 30 % des Durchmessers der Gegenwalze nach der Stelle ihrer ge­ringsten Entfernung zur Papierbahn bzw. dessen Führungselements C betragen. Die Rillenbreite c soll ein bestimmtes Verhältnis zur Breite der Rippen haben, wofür gelten soll b/c = 0,3 bis 0,8. Falls die Rippen 4 nicht durch eine Dachfläche 5 abge­flacht sind, gelten die angegebenen Werte und Beziehungen in einem Schnitt bei zwei Drittel der Rippenhöhe. Die Absolutwerte für die Rippenhöhe a betragen 0,3 bis 3 mm und für die Rippen­breite b 0,4 bis 8 mm; anzustreben ist eine Technologie, die untere Grenzwerte von 0,1 mm erlaubt. Die gleichen Dimensionsbereiche gelten auch für die entsprechende Rillenbreite c.In Fig. 1, the squeegee 1, as is customary in doctor squeegee rods guided in squeegee beds, is carried by a retaining blade or retaining leaf spring 2. It can be pressed against the counter-roller C and thus against the paper or cardboard web guided by a pressure bar or other pressure means, which act on the squeegee bar or the leaf spring in this specified area. In this figure, the radius of the counter roll C is indicated by R w and the radius of curvature of the arcuate doctor surface by R. According to FIG. 2, the squeegee surface consists of nothing but side by side arranged grooves 3, between which there are ribs 4. In this case, the ribs end in a flat roof surface 5 of width b. 3, these ribs narrow towards the trailing edge 7 of the squeegee strip 1, where their expansion is zero, ie they disappear. A rounding radius R₂ is provided for this. It can be seen from FIG. 1 that the grooves 3 flatten out towards the trailing edge, specifically a value between 10 and 25% of the normal height of the ribs 4 being provided for this. For the rounding radius R₁ applies approximately that it is between 3 and 30 mm, and it can generally R1 between 10 and 35% of the rounding radius R of the squeegee surface or between 5 and 30% of the diameter of the counter-roller after the point of their closest distance to the paper web or whose guide element is C. The groove width c should have a certain ratio to the width of the ribs, for which b / c = 0.3 to 0.8 should apply. If the ribs 4 are not flattened by a roof surface 5, the values and relationships given apply in one cut at two thirds of the rib height. The absolute values for the rib height a are 0.3 to 3 mm and for the rib width b 0.4 to 8 mm; A technology is to be aimed at that allows lower limit values of 0.1 mm. The same dimension ranges also apply to the corresponding groove width c.

Es ist möglich, daß der Radius R der Rakelfläche mindestens das 0,02-fache, vorzugsweise zwischen dem 0,1- und dem 0,2-fachen des Radius Rw der die Papier- bzw. Kartonbahn führenden Gegen­walze C beträgt.It is possible that the radius R of the doctor surface is at least 0.02 times, preferably between 0.1 and 0.2 times the radius R w of the counter roll C guiding the paper or cardboard web.

Es ist günstig, wenn die Ablaufkante 7 der Rakel sich in einem Abstand zwischen 0 und 10 mm vorzugsweise 0 und 6 mm von der nahesten Stelle der Rakelfläche in bezug auf die Papierbahn bzw. des diese stützenden Führungselements C befindet.It is advantageous if the trailing edge 7 of the doctor blade is located at a distance between 0 and 10 mm, preferably 0 and 6 mm, from the closest point of the doctor blade surface with respect to the paper web or the guide element C supporting it.

Durch die gewählte Form der Rille ist gewährleistet, daß ein gleichmäßiger Strichauftrag quer über das Papier, also entlang der Bahnbreite gesehen, erzeugt wird.The selected shape of the groove ensures that a uniform line application is produced across the paper, that is, seen along the web width.

In Fig. 4 und 5 ist dargestellt, daß die Rippen 3 an der Berüh­rungsstelle bzw. der Stelle der geringsten Entfernung zur Ge­genwalze C enden. Die Ablaufkante 7′ der Rakelleiste 1′ endet jedoch hier um den Wert d = 2 bis 4 mm in Bahnlaufrichtung da­hinter. Auch hier sind, wie im Falle von Fig. 3, die Rillen 3 am Ende, also im Bereich der Ablaufkante 7′, wesentlich ver­breitert ausgeführt und es erfolgt ein gleichmäßiges Glatt­streichen der Beschichtung durch die Ablaufkante 7′.4 and 5 it is shown that the ribs 3 end at the point of contact or the point of closest distance to the counter-roller C. The trailing edge 7 'of the squeegee 1' ends here, however, by the value d = 2 to 4 mm in the web running direction behind it. Here, too, as in the case of FIG. 3, the grooves 3 at the end, that is to say in the region of the run-off edge 7 ', are substantially widened and the coating is smoothed evenly by the run-off edge 7'.

Dabei setzt sich der Abrundungsradius R₁, mit dem sich die Rillen von ihrem Grunde aus hin zur Ablaufkante 7′ verflachen bis zu letzterer fort.Here, the radius of curvature R₁ continues, with which the grooves flatten from their base towards the trailing edge 7 'to the latter.

Dabei ist es günstig, wenn die Ablaufkante 7′ der Rakelfläche 0 bis 3 mm nach dem Ende der Rippen 4 folgt.It is advantageous if the trailing edge 7 'of the doctor surface 0 to 3 mm after the end of the ribs 4 follows.

Gemäß Fig. 6 ist die Rakelleiste 1˝ in der Nut 13 eines kompak­ten Rakelhalters 11 geführt. Ein Druckschlauch 12 ist zur An­pressung der Rakelleiste an die Gegenwalze C vorgesehen.6, the squeegee 1˝ is guided in the groove 13 of a compact squeegee holder 11. A pressure hose 12 is provided for pressing the squeegee against the counter roll C.

Durch den Überbestand der Ablaufkante 7 bzw. 7′ in bezug auf die der Warenbahn bzw. Gegenwalze C nahste Stelle der Rakel­oberfläche kann man eine Steuerung der Dosierung der Streich­masse erreichen. Eine Rakel mit gerillter Oberfläche ist ja ein dosierendes Streichelement, mit welchem man eine relativ genau dosierte Menge auf die Papierbahn auftragen kann. Durch den Überstand kann man durch Verschwenken der gebogenen, durch die Rippen und Rillen gebildeten Rakelfläche den auch bei mit Kera­mik beschichteten Rillen nicht ganz zu vermeidenden Verschleiß der Rippen etwas kompensieren. Diese Kompensationsmöglichkeit wird noch verstärkt durch den Abrundungsradius R₁.Due to the excess of the trailing edge 7 or 7 'in relation to the closest to the web or counter roll C point of the doctor surface, one can achieve a control of the dosage of the coating slip. A squeegee with a grooved surface is a metering coating element with which a relatively precisely metered amount can be applied to the paper web. Due to the protrusion, by pivoting the curved squeegee surface formed by the ribs and grooves, the wear of the ribs, which cannot be completely avoided even in the case of ceramic-coated grooves, can be somewhat compensated for. This compensation option is reinforced by the rounding radius R₁.

Claims (14)

1. Rakel zum Dosieren von Beschichtungen von Papier- oder Kar­tonbahnen, deren eigentlicher, die Dosierfläche aufweisen­der Rakelkörper als eine Leiste mit unregelmäßigem bzw. eckigem Querschnitt im Schnitt senkrecht zur Längser­streckung der Leiste und mit einer scharfen Ablauf- oder Abrißkante ausgebildet ist und deren Dosierfläche eben oder mit einer Rundung ausgebildet ist, so daß sich der Abstand derselben von der Papier- bzw. Kartonbahn in Laufrichtung - ausgenommen höchstens der Bereich an ihrer ablaufenden Kante - laufend kontinuierlich verringert, dadurch gekennzeichnet, daß die Rakelfläche gerillt ausgeführt ist mit zueinander parallelen Rillen (3), bildenden Rippen (4), die sich im wesentlichen quer bzw. senkrecht zur Längserstreckung der Rakelleiste (1) erstrecken und die ihre nächste Annäherung an die Papierbahn bzw. ein diese führendes Unterstützungselement (C) in einem Abstand von höchstens 6 mm, vorzugsweise 4 mm, von dem Bereich haben, wo sie an der Rakelfläche ablaufseitig enden, wobei die Rippen (4) in ihren Endbereichen zum Ablaufende des Rakelkörpers (1) hin mit allmählich abnehmender Breite (quer zu dem Verlauf der Rillen gemessen) ausgeführt sind und in einem Bereich von 0 bis 10 mm vorzugsweise 0 bis 6 mm vor der Ablaufkante (7, 7′) nicht mehr vorhanden sind.1. Squeegee for dosing coatings on paper or cardboard webs, the actual squeegee body of the metering surface being designed as a strip with an irregular or angular cross section in section perpendicular to the longitudinal extension of the strip and with a sharp trailing or tear-off edge and the dosing surface being flat or is designed with a rounding, so that the distance of the same from the paper or cardboard web in the running direction - except for at most the area at its trailing edge - continuously decreases continuously, characterized in that the doctor surface is grooved with mutually parallel grooves ( 3), forming ribs (4) which extend essentially transversely or perpendicularly to the longitudinal extension of the squeegee bar (1) and which come closest to the paper web or a supporting element (C) guiding it at a distance of at most 6 mm, preferably 4 mm from the area where they are de r Squeegee surface ends on the outlet side, the ribs (4) in their end regions toward the outlet end of the squeegee body (1) being designed with a gradually decreasing width (measured transversely to the course of the grooves) and preferably in a range from 0 to 10 mm 0 to 6 mm before the trailing edge (7, 7 ') no longer exist. 2. Rakel nach Anspruch 1, dadurch gekennzeichnet, daß im Schnitt längs der Rakelleistenlängsachse die Rakelfläche mit abgeflachten Oberflächen zumindest der Wellenberge (Rippen 4) ausgeführt ist.2. Squeegee according to claim 1, characterized in that in section along the longitudinal axis of the squeegee strip, the squeegee surface is designed with flattened surfaces of at least the wave crests (ribs 4). 3. Rakel nach Anspruch 2, dadurch gekennzeichnet, daß zur Ab­laufkante (7, 7′) hin in einer Entfernung von 0 bis 6 mm vorzugsweise 0 bis 3 mm von der nahsten Stelle der Rakelfläche in bezug auf die Papierbahn bzw. das diese führende Führungselement (C) sich die Rippen (4) verschmälern.3. Squeegee according to claim 2, characterized in that towards the trailing edge (7, 7 ') towards a distance of 0 to 6 mm, preferably 0 to 3 mm from the closest point of the squeegee surface with respect to the paper web or the guide element leading this (C) the ribs (4) narrow. 4. Rakel nach einem der Ansprüche 1 bis 3, dadurch gekenn­zeichnet, daß die Ablaufkante (7) der Rakel sich in einem Abstand zwischen 0 bis 10 vorzugsweise 0 und 6 mm von der nahesten Stelle der Rakelfläche in bezug auf die Papierbahn bzw. des diese stützenden Führungselements (C) befindet.4. Squeegee according to one of claims 1 to 3, characterized in that the trailing edge (7) of the squeegee is at a distance between 0 to 10, preferably 0 and 6 mm from the closest point of the squeegee surface with respect to the paper web or this supporting guide element (C). 5. Rakel nach einem der Ansprüche 1 bis 4, dadurch gekenn­zeichnet, daß die Rillen (3) sich zur Ablaufkante (7) hin bogenförmig von ihrem Grunde aus um 10 bis 25 % ihrer Ge­samthöhe mit einem Abrundungsradius (R1) zwischen 10 und 35 % des Abrundungsradius (R) der Rakelfläche oder zwischen 5 und 30 % des Durchmessers der Gegenwalze nach der Stelle ihrer geringsten Entfernung zur Papierbahn bzw. dessen Füh­rungselements (C) verflachen.5. Squeegee according to one of claims 1 to 4, characterized in that the grooves (3) towards the trailing edge (7) arcuate from their base by 10 to 25% of their total height with a radius of curvature (R1) between 10 and 35% flatten the radius of curvature (R) of the squeegee surface or between 5 and 30% of the diameter of the counter roll after the point of its closest distance to the paper web or its guide element (C). 6. Rakel nach einem der Ansprüche 1 bis 5, dadurch gekenn­zeichnet, daß das Verhältnis der Breite (b) der (flachen) Dachfläche (5) der Rippen (4) zur Breite (c) des zwischen benachbarten Rippen (4) liegenden Zwischenraums b/c = 0,3 bis 0,8 beträgt.6. Squeegee according to one of claims 1 to 5, characterized in that the ratio of the width (b) of the (flat) roof surface (5) of the ribs (4) to the width (c) of the intermediate space b between adjacent ribs (4) / c = 0.3 to 0.8. 7. Rakel nach einem der Ansprüche 1 bis 5, dadurch gekenn­zeichnet, daß das Verhältnis der Breite (b′) der Rippen (4), bei zwei Drittel der Rippenhöhe gemessen, zur Breite (c) des zwischen benachbarten Rippen liegenden Zwischenrau­mes b/c = 0,3 bis 0,8 beträgt.7. Squeegee according to one of claims 1 to 5, characterized in that the ratio of the width (b ') of the ribs (4), measured at two-thirds of the rib height, to the width (c) of the space between adjacent ribs b / c = 0.3 to 0.8. 8. Rakel nach einem der Ansprüche 1 bis 7, dadurch gekenn­zeichnet, daß das Verhältnis der Rillentiefe (a) zur Breite (b) der Dachfläche (5) bzw. der Rippen (4) bei zwei Drit­teln der Rippenhöhe gemessen a/b zwischen 1 und 2,5 be­trägt.8. Doctor blade according to one of claims 1 to 7, characterized in that the ratio of the groove depth (a) to the width (b) of the roof surface (5) or the ribs (4) measured at two thirds of the rib height a / b between 1 and 2.5. 9. Rakel nach einem der Ansprüche 1 bis 8, dadurch gekenn­zeichnet, daß der Radius (R) der Rakelfläche mindestens das 0,02-fache, vorzugsweise zwischen dem 0,1- und dem 0,2-fachen des Radius (Rw) der die Papier- bzw. Kartonbahn führenden Gegenwalze (C) beträgt.9. Doctor blade according to one of claims 1 to 8, characterized in that the radius (R) of the doctor blade surface at least 0.02 times, preferably between 0.1 and 0.2 times the radius (R w ) the counter roll (C) guiding the paper or cardboard web. 10. Rakel nach einem der Ansprüche 1 bis 9, dadurch gekenn­zeichnet, daß die Tiefe (a) der Rillen (3) zwischen 0,3 und 8 mm beträgt.10. Doctor blade according to one of claims 1 to 9, characterized in that the depth (a) of the grooves (3) is between 0.3 and 8 mm. 11. Rakel nach einem der Ansprüche 1 bis 10, dadurch gekenn­zeichnet, daß Rillenbreite (c) und die Breite (b) der Dachfläche (5) der Rippen (4) bzw. die Breite (b′) der Rippen bei zwei Drittel der Rippenhöhe gemessen, zwischen 0,3 und 3 mm beträgt.11. Squeegee according to one of claims 1 to 10, characterized in that the groove width (c) and the width (b) of the roof surface (5) of the ribs (4) or the width (b ') of the ribs at two thirds of the rib height measured, is between 0.3 and 3 mm. 12. Rakel nach einem der Anprüche 1 bis 11, dadurch gekennzeichnet, daß die Ablaufkante (7′) der Rakelfläche 0 bis 3 mm nach dem Ende der Rippen (4) folgt und der Rundungsradius (R₁), mit dem sich die Rillen (3) von ihrem Grunde aus verflachen, sich bis zur Ablaufkante (7′) im wesentlichen fortsetzt.12. Squeegee according to one of claims 1 to 11, characterized in that the trailing edge (7 ') of the squeegee surface 0 to 3 mm after the end of the ribs (4) and the radius of curvature (R₁) with which the grooves (3 ) flatten from the bottom, essentially continues to the drainage edge (7 ′). 13. Rakel nach einem der Ansprüche 1 bis 12, dadurch gekenn­zeichnet, daß zumindest die Oberfläche des Rakelkörpers (1) zumindest im Bereich seiner Rakelfläche aus einer keramisch harten und verschleißfesten Schicht besteht oder mit einer solchen versehen ist.13. Squeegee according to one of claims 1 to 12, characterized in that at least the surface of the squeegee body (1) at least in the area of its squeegee surface consists of a ceramic hard and wear-resistant layer or is provided with such. 14. Rakel nach einem der Ansprüche 1 bis 13, dadurch gekenn­zeichnet, daß der eigentliche Rakelkörper (1) aus oxidkera­mischem Material besteht.14. Doctor blade according to one of claims 1 to 13, characterized in that the actual doctor blade body (1) consists of oxide ceramic material.
EP90117799A 1989-10-14 1990-09-15 Metering device for metering coatings for paper or cardboard webs Expired - Lifetime EP0423492B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90117799T ATE98528T1 (en) 1989-10-14 1990-09-15 DOSING DEVICE FOR DOSING COATINGS OF PAPER OR CARDBOARD WEBS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3934418A DE3934418A1 (en) 1989-10-14 1989-10-14 RAKEL
DE3934418 1989-10-14

Publications (3)

Publication Number Publication Date
EP0423492A2 true EP0423492A2 (en) 1991-04-24
EP0423492A3 EP0423492A3 (en) 1991-10-23
EP0423492B1 EP0423492B1 (en) 1993-12-15

Family

ID=6391527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90117799A Expired - Lifetime EP0423492B1 (en) 1989-10-14 1990-09-15 Metering device for metering coatings for paper or cardboard webs

Country Status (9)

Country Link
US (1) US5119755A (en)
EP (1) EP0423492B1 (en)
JP (1) JPH03165868A (en)
AT (1) ATE98528T1 (en)
BR (1) BR9005306A (en)
DE (1) DE3934418A1 (en)
ES (1) ES2047224T3 (en)
FI (1) FI95942C (en)
NO (1) NO175707C (en)

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EP0556551A1 (en) * 1992-02-21 1993-08-25 J.M. Voith GmbH Roller assembly for applying a coating colour onto a paper web

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US5632814A (en) * 1992-02-27 1997-05-27 Jagenberg Aktiengesellschaft Device for applying a coating material to a running web
JP2622054B2 (en) * 1992-08-07 1997-06-18 ノムラテクノリサーチ株式会社 Coater blade and method for manufacturing the same
DE4302435A1 (en) * 1993-01-29 1993-08-12 Voith Gmbh J M Paper web coating appts. - has smoother against side of web in free path after leaving gap between applicator rollers
DE4334555C2 (en) * 1993-10-11 2003-06-26 Jagenberg Papiertech Gmbh Mount for a squeegee rod
DE4402226C2 (en) * 1994-01-27 1997-11-06 Voith Gmbh J M Doctor device
US5713276A (en) * 1995-09-22 1998-02-03 Motorola, Inc. Flexible self-level squeegee blade
JP3315595B2 (en) * 1996-06-10 2002-08-19 キヤノン株式会社 Developer regulating member and developing device
JP3443519B2 (en) * 1996-09-30 2003-09-02 京セラ株式会社 blade
DE29617230U1 (en) * 1996-10-04 1996-12-05 Voith Sulzer Papiermasch Gmbh Application device for applying a coating medium
SE507926C2 (en) * 1996-12-19 1998-07-27 Btg Kaelle Inventing Ab Coating sheet for coating a running track
SE511082C2 (en) * 1996-12-20 1999-08-02 Btg Eclepens Sa coating Sheet
US5846325A (en) * 1997-02-25 1998-12-08 The Mead Corporation Coating blade and method of using the same
DE102005029613A1 (en) * 2005-06-23 2007-01-04 Voith Patent Gmbh Device for metering and / or leveling
US8474378B1 (en) * 2010-02-23 2013-07-02 Valley Holdings, Llc Chamber blade/sealing assembly for a printing press

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Publication number Priority date Publication date Assignee Title
EP0556551A1 (en) * 1992-02-21 1993-08-25 J.M. Voith GmbH Roller assembly for applying a coating colour onto a paper web

Also Published As

Publication number Publication date
FI904876A0 (en) 1990-10-03
US5119755A (en) 1992-06-09
BR9005306A (en) 1991-09-17
NO175707C (en) 1994-11-23
FI95942B (en) 1995-12-29
NO904399D0 (en) 1990-10-11
FI95942C (en) 1996-04-10
ES2047224T3 (en) 1994-02-16
ATE98528T1 (en) 1994-01-15
EP0423492B1 (en) 1993-12-15
NO175707B (en) 1994-08-15
DE3934418A1 (en) 1991-04-18
JPH03165868A (en) 1991-07-17
NO904399L (en) 1991-04-15
EP0423492A3 (en) 1991-10-23

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