EP0633353B1 - Metering device - Google Patents

Metering device Download PDF

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Publication number
EP0633353B1
EP0633353B1 EP94109366A EP94109366A EP0633353B1 EP 0633353 B1 EP0633353 B1 EP 0633353B1 EP 94109366 A EP94109366 A EP 94109366A EP 94109366 A EP94109366 A EP 94109366A EP 0633353 B1 EP0633353 B1 EP 0633353B1
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EP
European Patent Office
Prior art keywords
clamping
holder
wall
metering system
continuation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94109366A
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German (de)
French (fr)
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EP0633353A1 (en
Inventor
Richard Bernert
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
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JM Voith GmbH
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Publication date
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Publication of EP0633353A1 publication Critical patent/EP0633353A1/en
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Publication of EP0633353B1 publication Critical patent/EP0633353B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod

Definitions

  • the invention relates to a metering system according to the preamble of claim 1.
  • Such metering systems are mainly used for coating webs of paper or cardboard, which is also provided in this case.
  • doctor blades known or designed as roller doctor blades, are used for coating or metering coating slip on sheets of paper or cardboard (see, for example, DE-C-21 50 906).
  • a roller guiding the paper web is generally associated with the doctor rod. It is often also provided that the coating slip used for coating is fed from a chamber through an orifice which, as a boundary wall, has the clamping wall to which the holder of the doctor blade bed receiving the roller doctor rod is fixed, e.g. is pressed.
  • edges or cross-sectional changes in the flow channel now generally arise, which can have a disadvantageous effect on the coating.
  • Such a paragraph also arises in particular at the transition between the aforementioned clamping wall and the holder of the doctor bed.
  • the object of the invention is to design the metering system so that as few edges and jumps in the flow path as possible, i.e. Corresponding cross-sectional enlargements or narrowing occur on the same.
  • the doctor blade bar with 1 and the receiving it generally made of plastic bed with 2 and the holder made in one piece with the bed 2 with 3.
  • the doctor blade rod 1 is generally in contact with a counter roller C guiding the web W, either the coating slip being fed directly to the web or initially only to the roller C, and then later being transferred to the web in an area where it wraps around the roller or touched.
  • the latter is generally the case when a press nip is formed between two web guide rollers and the coating slip is transferred there to the web.
  • the coating slip is fed through the channel 4, which is delimited on one side by a clamping wall 8, on which the holder 3 is pressed by means of a hydraulically or pneumatically operating pressure element 13 - generally designed as a pressure hose.
  • a projection 12 of the holder 3 serves as a fixation.
  • the holder 3 now has a thickness jump in the region of the end of the clamping wall 8, an extension 6 of the holder being formed which has a bevel which is at a corresponding bevel of the end wall of the clamping wall 8 is present.
  • the angle which the bevel of the extension 6 forms with the corresponding side wall surface of the holder 3 is between 15 and 55 °.
  • the extension of a tip 7 is formed according to Figure 1, so that there is a smooth transition between the clamping wall 8 and the holder 3 and thus there is a relatively low-loss flow out of the channel 4.
  • a groove at the transition between the extension 6 and the Provided end of the holder is a groove at the transition between the extension 6 and the Provided end of the holder. This mobility is necessary so that the doctor bed and thus the doctor rod can be pushed in the direction of the roller C. This is also generally done by means of a pneumatically acting pressure hose 14.
  • FIG. 3 shows a variant in which the extension 6 ′′ of the holder 3 ′′ is relatively long and slender.
  • its side delimitation surface which is distant from the clamping part of the holder 3 ′′, is aligned with the corresponding side delimitation surface of the clamping 8 ′′.
  • the angle of the inclination of the clamping and the extension is approximately 70 ° relatively large and therefore not as cheap as a smaller angle. It is namely favorable if the extension can slide relatively easily on the corresponding wall of the clamping 8 ′′ when the holder 3 ′′ is bent.
  • FIG. 4 shows a relatively short extension 6 '' 'of the holder 3' '', which ends in a small rounded tip and which bears against the corresponding mating surface of the clamping 8 '' '.
  • the holder 23 has a further thick crack at 29 and forms on it with a relatively small cross section trained, relatively weakened point of rotation for the doctor bed.
  • the projection 26 is supported on the clamping wall 28 of the doctor holder. This is arranged approximately at right angles to the wall along which the coating slip flows according to the arrow entered. So here the slope of the clamping wall is no longer available in other figures. In this respect, as well as a slope with too little inclination, ie an angle greater than 55 °, is unfavorable in the event that the doctor bed and holder are replaced by a doctor blade. You then no longer have such a streamlined course of the channel to the web or counter roll or coating edge of the doctor element.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention relates to a metering system with a doctor element designed as a doctor rod for coating material webs, which are guided over at least one roll which is assigned to the doctor element, the doctor element being held in a bed which is carried by a holder which is designed in one piece with the bed and which is held on one wall of a clamp which is simultaneously one boundary wall of the opening channel for the coating compound, the holder having at its end a clamping or tensioning surface on its side opposite the clamping wall. The invention is characterised in that, in the region of the end of the clamping wall bounding the supply channel, the holder has a step change in thickness and has there, at its side opposite the said clamping or tensioning surface, an extension which is designed with a bevel which forms an angle between 15 and 55 DEG with the boundary wall of the holder which is on the side opposite the clamping or tensioning surface, this boundary wall surface being flush with the wall surface of the clamping wall. <IMAGE>

Description

Die Erfindung betrifft ein Dosiersystem entsprechend dem Oberbegriff des Patentanspruchs 1. Solche Dosiersysteme werden hauptsächlich für die Beschichtung von Bahnen aus Papier oder Karton benutzt, was in diesem Fall ebenso vorgesehen ist.The invention relates to a metering system according to the preamble of claim 1. Such metering systems are mainly used for coating webs of paper or cardboard, which is also provided in this case.

Vielfach werden als Rollrakelstäbe bezeichnete bzw. ausgebildete Rakeln zur Beschichtung oder Dosierung von Streichmasse auf Bahnen aus Papier oder Karton benutzt (siehe z.B. DE-C- 21 50 906). Dabei ist dem Rakelstab im allgemeinen eine die Papierbahn führende Walze zugeordnet. Dabei ist oft auch vorgesehen, daß die zur Beschichtung dienende Streichmasse von einer Kammer her durch eine Mündung zugeführt wird, die als Begrenzungswand die Einspannwand hat, an der der Halter des den Rollrakelstab aufnehmenden Rakelbetts festgelegt, z.B. angepreßt ist.In many cases, doctor blades, known or designed as roller doctor blades, are used for coating or metering coating slip on sheets of paper or cardboard (see, for example, DE-C-21 50 906). A roller guiding the paper web is generally associated with the doctor rod. It is often also provided that the coating slip used for coating is fed from a chamber through an orifice which, as a boundary wall, has the clamping wall to which the holder of the doctor blade bed receiving the roller doctor rod is fixed, e.g. is pressed.

Im Wege des Flusses der Streichmasse von der Mündung zur Walze bzw. dem Rollrakelstab entstehen nun im allgemeinen Kanten oder Querschnittsänderungen des Strömungskanals, die sich nachteilig auf den Strich auswirken können. Ein solcher Absatz entsteht insbesondere auch an dem Übergang zwischen der genannten Einspannwand und dem Halter des Rakelbetts. Die Aufgabe der Erfindung ist es, das Dosiersystem so auszubilden, daß möglichst wenig Kanten und Sprünge im Strömungsweg, d.h. entsprechende Querschnittserweiterungen oder -verengungen auf demselben auftreten.In the course of the flow of the coating slip from the mouth to the roller or the doctor blade rod, edges or cross-sectional changes in the flow channel now generally arise, which can have a disadvantageous effect on the coating. Such a paragraph also arises in particular at the transition between the aforementioned clamping wall and the holder of the doctor bed. The object of the invention is to design the metering system so that as few edges and jumps in the flow path as possible, i.e. Corresponding cross-sectional enlargements or narrowing occur on the same.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst. Die erfindungsgemäße Lösung ermöglicht es, die Verstellbewegung der Rakelhalterung ohne eine größere Behinderung durchzuführen und dabei zumindest an der Seite der Rakelhalterung einen glatten Strömungsweg zu erzeugen.This object is achieved by the features of the characterizing part of patent claim 1. The solution according to the invention makes it possible to carry out the adjustment movement of the squeegee holder without a major hindrance and to produce a smooth flow path at least on the side of the squeegee holder.

Nachfolgend wird die Erfindung anhand der beigefügten Figuren erläutert, die Ausführungsbeispiele im Querschnitt vereinfacht darstellen.The invention is explained below with reference to the attached figures, which illustrate exemplary embodiments in simplified cross-section.

In Figur 1 ist der Rollrakelstab mit 1 und das ihn aufnehmende, im allgemeinen aus Kunststoff ausgebildete Bett mit 2 sowie der mit dem Bett 2 einstückig ausgeführte Halter mit 3 bezeichnet. Der Rollrakelstab 1 liegt im allgemeinen an einer die Bahn W führenden Gegenwalze C an, wobei entweder die Streichmasse direkt zur Bahn oder zunächst nur zur Walze C geführt wird, und dann später in einem Bereich auf die Bahn übertragen wird, wo diese die Walze umschlingt oder berührt. Letzteres ist dann im allgemeinen der Fall, wenn ein Preßspalt zwischen zwei Bahnführungswalzen gebildet ist und dort die Übertragung der Streichmasse auf die Bahn erfolgt.In Figure 1, the doctor blade bar with 1 and the receiving it, generally made of plastic bed with 2 and the holder made in one piece with the bed 2 with 3. The doctor blade rod 1 is generally in contact with a counter roller C guiding the web W, either the coating slip being fed directly to the web or initially only to the roller C, and then later being transferred to the web in an area where it wraps around the roller or touched. The latter is generally the case when a press nip is formed between two web guide rollers and the coating slip is transferred there to the web.

Die Zuführung der Streichmasse erfolgt durch den Kanal 4, der auf einer Seite von einer Einspannwand 8 begrenzt ist, an der der Halter 3 mittels einem hydraulisch oder pneumatisch arbeitenden Druckelement 13 - im allgemeinen ausgeführt als Druckschlauch - angepreßt wird. Als Fixierung dient dabei ein Vorsprung 12 des Halters 3. Der Halter 3 hat nun einen Dickensprung im Bereich des Endes der Einspannwand 8, wobei ein Fortsatz 6 des Halters gebildet ist, der eine Schräge aufweist, die an einer entsprechenden Schräge der Stirnwand der Einspannwand 8 anliegt. Der Winkel, den die Schräge des Fortsatzes 6 mit der entsprechenden Seitenwandfläche des Halters 3 bildet, beträgt zwischen 15 und 55°. Praktisch ist nach Figur 1 der Fortsatz von einer Spitze 7 ausgebildet, so daß sich ein glatter Übergang zwischen der Einspannwand 8 und dem Halter 3 ergibt und somit sich eine relativ verlustarme Strömung aus dem Kanal 4 heraus ergibt.The coating slip is fed through the channel 4, which is delimited on one side by a clamping wall 8, on which the holder 3 is pressed by means of a hydraulically or pneumatically operating pressure element 13 - generally designed as a pressure hose. A projection 12 of the holder 3 serves as a fixation. The holder 3 now has a thickness jump in the region of the end of the clamping wall 8, an extension 6 of the holder being formed which has a bevel which is at a corresponding bevel of the end wall of the clamping wall 8 is present. The angle which the bevel of the extension 6 forms with the corresponding side wall surface of the holder 3 is between 15 and 55 °. In practice, the extension of a tip 7 is formed according to Figure 1, so that there is a smooth transition between the clamping wall 8 and the holder 3 and thus there is a relatively low-loss flow out of the channel 4.

Für eine freie Beweglichkeit des Halters 3 ist eine Hohlkehle beim Übergang zwischen dem Fortsatz 6 und dem Ende des Halters vorgesehen. Diese Beweglichkeit ist nötig, damit das Rakelbett und damit der Rakelstab in Richtung auf die Walze C geschoben werden kann. Dies erfolgt im allgemeinen auch durch einen pneumatisch wirkenden Druckschlauch 14.For a free mobility of the holder 3 is a groove at the transition between the extension 6 and the Provided end of the holder. This mobility is necessary so that the doctor bed and thus the doctor rod can be pushed in the direction of the roller C. This is also generally done by means of a pneumatically acting pressure hose 14.

In Figur 2 ist die Anordnung ähnlich mit einem ähnlichen Fortsatz 6', der jedoch nicht in einer Spitze endet, sondern abgerundet ist. Es kann ein ganz minimaler Spalt zwischen einer entsprechenden Hohlkehle der Einspannwand 8' vorliegen. Auch hierdurch sind die Strömungsverhältnisse günstig, und es ist die freie Beweglichkeit des Halters 3 im erforderlichen Maß gegeben.In Figure 2, the arrangement is similar with a similar extension 6 ', but which does not end in a tip, but is rounded. There can be a very minimal gap between a corresponding fillet of the clamping wall 8 '. This also makes the flow conditions favorable, and there is free movement of the holder 3 to the extent required.

In Figur 3 ist eine Variante dargestellt, bei welcher der Fortsatz 6'' des Halters 3'' relativ lang und schlank ausgebildet ist. Auch in diesem Fall fluchtet seine von dem Einspannteil des Halters 3'' entfernte Seitenbegrenzungsfläche mit der entsprechenden Seitenbegrenzungsfläche der Einspannung 8''. Hier ist der Winkel der Schrägung der Einspannung und des Fortsatzes etwa 70° relativ groß ausgebildet und daher an sich nicht so günstig wie ein kleinerer Winkel. Es ist nämlich günstig, wenn der Fortsatz relativ leicht auf der entsprechenden Wand der Einspannung 8'' bei Verbiegung des Halters 3'' gleiten kann.FIG. 3 shows a variant in which the extension 6 ″ of the holder 3 ″ is relatively long and slender. In this case too, its side delimitation surface, which is distant from the clamping part of the holder 3 ″, is aligned with the corresponding side delimitation surface of the clamping 8 ″. Here the angle of the inclination of the clamping and the extension is approximately 70 ° relatively large and therefore not as cheap as a smaller angle. It is namely favorable if the extension can slide relatively easily on the corresponding wall of the clamping 8 ″ when the holder 3 ″ is bent.

In Figur 4 ist ein relativ kurzer Fortsatz 6''' des Halters 3''' dargestellt, der in einer kleinen abgerundeten Spitze endet und mit dieser an der entsprechenden Gegenfläche der Einspannung 8''' anliegt.FIG. 4 shows a relatively short extension 6 '' 'of the holder 3' '', which ends in a small rounded tip and which bears against the corresponding mating surface of the clamping 8 '' '.

Bei der in Figur 5 dargestellten Anordnung ist ein anderer Weg beschritten worden, um den Fortsatz auszubilden und den glatten Strömungskanal bis zum Rakelbett herzustellen. Hier weist der Halter 23 bei 29 einen weiteren dicken Sprung auf und bildet an dieser mit relativ geringem Querschnitt ausgebildete, relativ geschwächten Stelle einen Drehpunkt für das Rakelbett. Dabei stützt sich der Vorsprung 26 auf der Einspannwand 28 der Rakelhalterung ab. Diese ist etwa rechtwinklig zu der Wand angeordnet, an der die Streichmasse entsprechend dem eingetragenen Pfeil entlangströmt. Hier ist also die Schräge der Einspannwand bei anderen Figuren nicht mehr vorhanden. Dies ist insofern - ebenso wie eine Schräge mit zu geringer Neigung, d.h. Winkel größer als 55° - für den Fall ungünstig, daß man das Rakelbett samt Halter austauscht durch eine Streichklinge. Man hat dann keinen so strömungsgünstigen Verlauf des Kanals bis zur Warenbahn oder Gegenwalze bzw. Streichkante des Rakelelements mehr.In the arrangement shown in FIG. 5, another path has been taken in order to form the extension and to produce the smooth flow channel up to the doctor bed. Here, the holder 23 has a further thick crack at 29 and forms on it with a relatively small cross section trained, relatively weakened point of rotation for the doctor bed. The projection 26 is supported on the clamping wall 28 of the doctor holder. This is arranged approximately at right angles to the wall along which the coating slip flows according to the arrow entered. So here the slope of the clamping wall is no longer available in other figures. In this respect, as well as a slope with too little inclination, ie an angle greater than 55 °, is unfavorable in the event that the doctor bed and holder are replaced by a doctor blade. You then no longer have such a streamlined course of the channel to the web or counter roll or coating edge of the doctor element.

Claims (6)

  1. A metering system with a doctor element designed as a doctor rod for coating webs of material which are guided over at least one roller which is associated with the doctor element, the doctor element (1) being held in a bed (2) which is borne by a holder (3) which is held on a wall (8) in a clamping means which at the same time is one limiting wall of the opening duct (4) for the coating substance, the holder (3) having a clamping or gripping surface on its end on the side located opposite the clamping wall (8), characterised in that in the region of the end of the clamping wall (8) limiting the feed duct (4) the holder (3) has a step in thickness and has there on its side located opposite said clamping or gripping surface a continuation (6), the side of which which is remote from the clamping or gripping surface of the holder (3) is flush with the corresponding side limiting surface of the holder and with the corresponding side limiting surface of the clamping wall (8).
  2. A metering system according to Claim 1, characterised in that the continuation (6) is designed with a slope which forms an angle of between 15 and 55° with the limiting wall of the holder (3) which is located on the side opposite the clamping or gripping surface.
  3. A metering system according to Claim 3 [sic], characterised in that the clamping wall (8) on its end facing the continuation (6) is matched to the slope thereof and has the corresponding inclination, so that the inclined wall section of the continuation (6) lies fully against the clamping wall (8).
  4. A metering system according to Claim 4, characterised in that the continuation (6) of the holder (3) is designed as a point (7).
  5. A metering system according to one of Claims 1 to 4, characterised in that a groove is provided at the transition between the continuation (6) and the side of the holder (3) adjacent to the clamping or gripping surface.
  6. A metering system according to one of Claims 1 to 5, characterised in that the holder (3) is formed of one piece with the bed (2).
EP94109366A 1993-07-10 1994-06-17 Metering device Expired - Lifetime EP0633353B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4323166 1993-07-10
DE4323166 1993-07-10
DE4327544 1993-08-16
DE4327544A DE4327544C1 (en) 1993-07-10 1993-08-16 Dosing system

Publications (2)

Publication Number Publication Date
EP0633353A1 EP0633353A1 (en) 1995-01-11
EP0633353B1 true EP0633353B1 (en) 1996-08-28

Family

ID=25927582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94109366A Expired - Lifetime EP0633353B1 (en) 1993-07-10 1994-06-17 Metering device

Country Status (7)

Country Link
US (1) US5445673A (en)
EP (1) EP0633353B1 (en)
JP (1) JPH07108202A (en)
AT (1) ATE141975T1 (en)
CA (1) CA2127663A1 (en)
DE (2) DE4327544C1 (en)
FI (1) FI943279A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29510486U1 (en) * 1995-06-30 1995-08-17 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Squeegee assembly
DE102005029613A1 (en) * 2005-06-23 2007-01-04 Voith Patent Gmbh Device for metering and / or leveling

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2150907C3 (en) * 1971-10-13 1978-03-30 Feldmuehle Ag, 4000 Duesseldorf Device for painting web-shaped material
US3859690A (en) * 1972-10-02 1975-01-14 Ross Ltd James Doctor blade assembly
DE3022955C2 (en) * 1980-06-19 1982-12-16 Jagenberg-Werke AG, 4000 Düsseldorf Device for regulating the application thickness when coating moving material webs
DE3236991A1 (en) * 1982-10-06 1984-04-12 J.M. Voith Gmbh, 7920 Heidenheim Coating device for running webs of material
FI72903C (en) * 1984-04-17 1987-08-10 Ahlstroem Oy Method and apparatus for coating web.
FI73266C (en) * 1984-06-29 1987-09-10 Waertsilae Oy Ab Rod scraper for paper coating device.
FI81734C (en) * 1987-12-03 1990-12-10 Valmet Paper Machinery Inc FOERFARANDE OCH ANORDNING FOER APPLICERING OCH DOSERING AV BESTRYKNINGSMEDEL PAO ROERLIGT UNDERLAG.
US5192591A (en) * 1991-11-14 1993-03-09 Beloit Technologies, Inc. Short dwell coater apparatus

Also Published As

Publication number Publication date
FI943279A (en) 1995-01-11
JPH07108202A (en) 1995-04-25
EP0633353A1 (en) 1995-01-11
ATE141975T1 (en) 1996-09-15
DE4327544C1 (en) 1995-01-19
US5445673A (en) 1995-08-29
DE59400547D1 (en) 1996-10-02
FI943279A0 (en) 1994-07-08
CA2127663A1 (en) 1995-01-11

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