EP0413095B1 - Roller squeegee - Google Patents

Roller squeegee Download PDF

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Publication number
EP0413095B1
EP0413095B1 EP90109539A EP90109539A EP0413095B1 EP 0413095 B1 EP0413095 B1 EP 0413095B1 EP 90109539 A EP90109539 A EP 90109539A EP 90109539 A EP90109539 A EP 90109539A EP 0413095 B1 EP0413095 B1 EP 0413095B1
Authority
EP
European Patent Office
Prior art keywords
annular discs
diameter
doctor
support bar
another
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
EP90109539A
Other languages
German (de)
French (fr)
Other versions
EP0413095A2 (en
EP0413095A3 (en
Inventor
Klaus Henseler
Rudolf Beisswanger
Hans-Peter Dr. Sollinger
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
Priority to AT90109539T priority Critical patent/ATE94431T1/en
Publication of EP0413095A2 publication Critical patent/EP0413095A2/en
Publication of EP0413095A3 publication Critical patent/EP0413095A3/en
Application granted granted Critical
Publication of EP0413095B1 publication Critical patent/EP0413095B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/15—Roller structure

Definitions

  • the invention relates to a doctor blade according to the preamble of claim 1.
  • a doctor blade is known from US-PS 30 84 663.
  • doctor rods act as a very precise dosing agent.
  • the ribs remaining between the grooves or forming these grooves wear out very quickly during operation. There is therefore an endeavor to produce the doctor rods from the most wear-resistant material, but here the limits are soon reached by the production.
  • the object is to produce a doctor blade provided with circumferential grooves, so-called roller doctor blades, with a very wear-resistant surface.
  • the disks 2 of smaller diameter consist e.g. made of normal steel, while the disks 1 of the larger diameter preferably consist of ceramic, in particular oxide ceramic.
  • the difference in diameter is dimensioned depending on the required depth of the grooves 6. It is generally less than 1.5 mm, with an application of the doctor rod at groove depths of at most 0.2 mm preferably being considered here.
  • These grooves are very difficult to manufacture, on the other hand, wear plays a special role here due to the small groove depth.
  • Normal, e.g. Doctor rods made entirely of steel have a far too short service life in operation.
  • the thickness of the washers is generally between 0.1 and 0.5 mm in these applications.
  • the intermediate ring disks 2 are preferably made of an elastic material, for example steel, or a solid aluminum. They can also preferably be made somewhat thicker than the ceramic disks 1. As a result, the entire rod becomes more elastic, so that when the doctor rod deflects, the relatively brittle ceramic disks 1 cannot be overstressed so easily. It can be seen from FIG. 2 that the ceramic disks 1 are fixed in the circumferential direction on the carrier rod 3 by means of a groove 5 and a tongue 4. The whole package from the washers is clamped on both or at one end of the support rod 3, for example by a nut 8. But you can also glue the washers to each other and to the support rod 3.
  • Another manufacturing method consists of alternately applying disks 1, 2 made of different materials with the same outside diameter to the support rod 3, clamping them and grinding the outside diameter continuously. Then the spacers 2 can be reduced in their outer diameter by etching to the required groove depth, e.g. partially immerse the squeegee in an etching bath while rotating until the required groove depth is reached. Corresponding material removal by spark erosion or electrochemical erosion is also possible.
  • the carrier rod 3 should be made of this material because of the same possible thermal expansion coefficient.

Landscapes

  • Medicines Containing Plant Substances (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Coating Apparatus (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Farming Of Fish And Shellfish (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Coating With Molten Metal (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Confectionery (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Lubricants (AREA)
  • Closures For Containers (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Bakery Products And Manufacturing Methods Therefor (AREA)
  • Paper (AREA)

Abstract

A roller squeegee consists of two different annular plates 2 which are clamped tightly on a cylindrical support rod 3 or fastened in some other way. In this arrangement, annular plates 2 of a smaller diameter and made of elastic material alternate with annular plates of a larger diameter made of very hard-wearing material, in particular made of ceramic. The difference in the outer diameters results in a halving of the groove depth of the circumferential grooves, of the roller squeegee, formed between the different annular plates. <IMAGE>

Description

Die Erfindung betrifft eine Stabrakel entsprechend dem Oberbegriff des Patentanspruchs 1. Eine solche Rakel ist bekannt aus der US-PS 30 84 663.The invention relates to a doctor blade according to the preamble of claim 1. Such a doctor blade is known from US-PS 30 84 663.

Die im wesentlichen in Umfangsrichtung verlaufenden Oberflächenrillen dieser Rakelstäbe wirken als ein recht genaues Dosiermittel. Die zwischen den Rillen verbleibenden bzw. diese Rillen bildenden Rippen verschleißen allerdings recht schnell im Betrieb. Es besteht daher das Bestreben, die Rakelstäbe aus möglichst verschleißfestem Material herzustellen, wobei hier jedoch durch die Herstellung bald die Grenzen erreicht sind.The essentially circumferential surface grooves of these doctor rods act as a very precise dosing agent. However, the ribs remaining between the grooves or forming these grooves wear out very quickly during operation. There is therefore an endeavor to produce the doctor rods from the most wear-resistant material, but here the limits are soon reached by the production.

Erfindungsgemäß besteht die Aufgabe darin, eine mit Umfangsrillen versehene Rakel, sogenannte Rollrakelstäbe, mit sehr verschleißfester Oberfläche herzustellen.According to the invention, the object is to produce a doctor blade provided with circumferential grooves, so-called roller doctor blades, with a very wear-resistant surface.

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.

Ein vorteilhaftes Herstellungsverfahren geht aus Anspruch 6 hervor.An advantageous manufacturing method is evident from claim 6.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert, wobei

Fig. 1
eine Seitenansicht und
Fig. 2
einen Querschnitt durch einen erfindungsgemäßen Rakelstab

zeigen.The invention is explained below using an exemplary embodiment shown in the drawing, wherein
Fig. 1
a side view and
Fig. 2
a cross section through a doctor rod according to the invention

demonstrate.

Auf einem zylindrischen Trägerstab 3 sind Ringscheiben 1 und 2 verschiedenen Materials nebeneinander aufgereiht. Die Scheiben 2 kleineren Durchmessers bestehen dabei z.B. aus einem normalen Stahl, während die Scheiben 1 des größeren Durchmessers vorzugsweise aus Keramik, insbesondere Oxidkeramik, bestehen. Der Durchmesserunterschied wird dabei je nach der erforderlichen Tiefe der Rillen 6 bemessen. Er beträgt im allgemeinen weniger als 1,5 mm, wobei hier vorzugsweise an eine Anwendung des Rakelstabes bei Rillentiefen von höchstens 0,2 mm gedacht ist. Diese Rillen lassen sich sehr schwer herstellen, andererseits spielt hier bei der geringen Rillentiefe der Verschleiß eine besondere Rolle. Normale, z.B. ganz aus Stahl hergestellte Rakelstäbe haben eine bei weitem zu geringe Standzeit im Betrieb.On a cylindrical support rod 3, washers 1 and 2 of different materials are lined up side by side. The disks 2 of smaller diameter consist e.g. made of normal steel, while the disks 1 of the larger diameter preferably consist of ceramic, in particular oxide ceramic. The difference in diameter is dimensioned depending on the required depth of the grooves 6. It is generally less than 1.5 mm, with an application of the doctor rod at groove depths of at most 0.2 mm preferably being considered here. These grooves are very difficult to manufacture, on the other hand, wear plays a special role here due to the small groove depth. Normal, e.g. Doctor rods made entirely of steel have a far too short service life in operation.

Die Dicke der Ringscheiben beträgt im allgemeinen bei diesen Anwendungsfällen zwischen 0,1 und 0,5 mm. Vorzugsweise werden die Zwischenringscheiben 2 aus einem elastischen Material, z.B. Stahl, oder einem festen Aluminium hergestellt. Man kann sie auch vorzugsweise etwas dicker machen als die Keramikscheiben 1. Dadurch wird der ganze Stab elastischer, so daß bei Durchbiegungen des Rakelstabes es nicht so leicht zu Überbeanspruchungen der relativ spröden Keramikscheiben 1 kommen kann. Man erkennt aus Figur 2, daß die Keramikscheiben 1 mittels Nut 5 und Feder 4 an dem Trägerstab 3 in Umfangsrichtung festgelegt sind. Das ganze Paket aus den Ringscheiben wird an beiden oder an einem Ende des Trägerstabes 3 z.B. durch eine Mutter 8 festgespannt. Man kann die Ringscheiben aber auch gegenseitig und auf den Trägerstab 3 festkleben.The thickness of the washers is generally between 0.1 and 0.5 mm in these applications. The intermediate ring disks 2 are preferably made of an elastic material, for example steel, or a solid aluminum. They can also preferably be made somewhat thicker than the ceramic disks 1. As a result, the entire rod becomes more elastic, so that when the doctor rod deflects, the relatively brittle ceramic disks 1 cannot be overstressed so easily. It can be seen from FIG. 2 that the ceramic disks 1 are fixed in the circumferential direction on the carrier rod 3 by means of a groove 5 and a tongue 4. The whole package from the washers is clamped on both or at one end of the support rod 3, for example by a nut 8. But you can also glue the washers to each other and to the support rod 3.

Ein anderes Herstellungsverfahren besteht darin, Scheiben 1, 2 aus verschiedenem Material mit gleichem Außendurchmesser abwechselnd auf dem Trägerstab 3 aufzubringen, festzuspannen und den Außendurchmesser durchgehend zu schleifen. Danach können die Abstandsscheiben 2 in ihrem Außendurchmesser durch Ätzen auf die benötigte Rillentiefe verringert werden, indem man z.B. den Rakelstab in ein Ätzbad teilweise eintauchen und dabei rotieren läßt, solange bis die nötige Rillentiefe erreicht ist. Es ist auch eine entsprechende Materialabtragung durch Funkenerosion oder elektrochemische Erosion möglich.Another manufacturing method consists of alternately applying disks 1, 2 made of different materials with the same outside diameter to the support rod 3, clamping them and grinding the outside diameter continuously. Then the spacers 2 can be reduced in their outer diameter by etching to the required groove depth, e.g. partially immerse the squeegee in an etching bath while rotating until the required groove depth is reached. Corresponding material removal by spark erosion or electrochemical erosion is also possible.

Bestehen die Zwischenscheiben 2 z.B. aus einem festen Aluminium, so sollte wegen möglichst gleicher Wärmedehnungskoeffizienten auch der Trägerstab 3 aus diesem Material hergestellt werden.If the washers 2 exist e.g. made of a solid aluminum, the carrier rod 3 should be made of this material because of the same possible thermal expansion coefficient.

Claims (7)

  1. Doctor bar comprising surface grooves running basically in the circumferential direction, characterized by a plurality of annular discs in two different forms of construction (1, 2), which differ both in the material and also in the external diameter, the latter by at most 1.5 mm, and which are disposed tightly alongside one another and alternately on a cylindrical support bar (3), the annular discs (2) of smaller diameter being of a substantially elastic material and the annular discs (1) of the larger diameter being of a highly wear-resistant material, especially ceramic.
  2. Doctor bar according to Claim 1, characterized in that the thickness of the annular discs (1, 2) is between 0.1 and 0.5 mm.
  3. Doctor bar according to Claim 1 or 2, characterized in that the difference in diameter between the annular discs (1, 2) is at most 0.2 mm.
  4. Doctor bar according to one of Claims 1 to 3, characterized in that at least the annular discs (1) of larger diameter are secured in the circumferential direction on the support bar (3) by groove (5) and tongue (4).
  5. Doctor bar according to one of Claims 1 to 4, characterized in that the annular discs (1, 2) are tightened onto one another on the support bar (3).
  6. Method of making a doctor bar according to one of Claims 1 to 5, characterized in that first the annular discs (1, 2) of different materials but of the same external diameter are secured tightly alongside one another and alternately on the support bar (3), then the external diameter of the annular discs (1, 2) is ground and finally the material of the annular discs (2) of smaller diameter is etched away or electrically eroded down to the required depth of the grooves (6) existing between the annular discs (1) of larger diameter.
  7. Method according to Claim 6, characterized in that the annular discs (1, 2) are glued to one another on the support bar (3).
EP90109539A 1989-07-19 1990-05-19 Roller squeegee Expired - Lifetime EP0413095B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90109539T ATE94431T1 (en) 1989-07-19 1990-05-19 ROD BRACKET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3923850 1989-07-19
DE3923850A DE3923850A1 (en) 1989-07-19 1989-07-19 STICK RAKEL

Publications (3)

Publication Number Publication Date
EP0413095A2 EP0413095A2 (en) 1991-02-20
EP0413095A3 EP0413095A3 (en) 1991-11-21
EP0413095B1 true EP0413095B1 (en) 1993-09-15

Family

ID=6385357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109539A Expired - Lifetime EP0413095B1 (en) 1989-07-19 1990-05-19 Roller squeegee

Country Status (10)

Country Link
US (1) US5103759A (en)
EP (1) EP0413095B1 (en)
JP (1) JPH0352667A (en)
AT (1) ATE94431T1 (en)
BR (1) BR9003252A (en)
CA (1) CA2021479A1 (en)
DE (1) DE3923850A1 (en)
ES (1) ES2045640T3 (en)
FI (1) FI903601A0 (en)
NO (1) NO175684C (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5179909A (en) * 1988-07-27 1993-01-19 J.M. Voith Gmbh Device for dosing coating substances on a traveling web of paper or cardboard or the like
DE4210529A1 (en) * 1991-12-11 1993-10-07 Kochsmeier Hans Hermann Dosing device for liquid application agents
DE4317657C1 (en) * 1993-05-27 1994-07-14 Voith Gmbh J M Coating device for coating running webs
DE4330545C2 (en) * 1993-09-09 1996-02-01 Voith Gmbh J M Doctor device
DE29506731U1 (en) * 1995-04-20 1995-06-22 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Application work for coating a running web, in particular made of paper or cardboard
US5599393A (en) * 1995-04-25 1997-02-04 Macmillan Bloedel Limited Metering rod coaters
DE19711728A1 (en) * 1997-03-20 1998-09-24 Voith Sulzer Papiermasch Gmbh Papermaking doctor blade
DE19840951A1 (en) * 1998-09-08 2000-03-09 Jagenberg Papiertech Gmbh Doctor rod for a coating device
US7016327B2 (en) * 2002-08-21 2006-03-21 Qualcomm Incorporated Method and system for communicating content on a broadcast services communication system
ATE427793T1 (en) * 2005-06-17 2009-04-15 Sandvik Intellectual Property ROLLER
DE102009060666A1 (en) * 2009-12-22 2011-06-30 Kiener Maschinenbau GmbH, 73466 Device for the surface application of a flowable medium on a material web
MX2011000634A (en) * 2010-01-18 2011-11-04 Basf Se Strand guide assembly and method of controlling a flow of molten thermoplastic.

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1517036A (en) * 1919-03-10 1924-11-25 Karlstad Mekaniska Ab Roller for pressing apparatus for wood pulp and cellulose
US1428142A (en) * 1920-12-17 1922-09-05 Canda Ferdinand Mora Roll for rolling mills
GB731530A (en) * 1950-08-17 1955-06-08 Winkler Fallert & Co Maschf Ink transfer roller for continuous inking mechanisms of book printing presses, offset presses and like printing presses
US2961336A (en) * 1955-06-17 1960-11-22 Nat Steel Corp Method of hot coating strip materials with paints or enamels
US2808616A (en) * 1956-06-22 1957-10-08 Ernest C Baldasarre Mineral wool spinning wheel
NL126326C (en) * 1960-08-29
US3336866A (en) * 1965-05-14 1967-08-22 Friden Inc Ink roller
US3457618A (en) * 1967-01-10 1969-07-29 Gunter & Cooke Inc Magnetic roll structure and method of forming same
JPS55164162A (en) * 1979-06-06 1980-12-20 Hitachi Ltd Forming method for thin film
US4352230A (en) * 1980-01-11 1982-10-05 New Hudson Corporation Fiber covered roller for high temperature applications
DE3201417C2 (en) * 1981-01-22 1986-01-16 Nippon Steel Corp., Tokio/Tokyo Solid metal roller for transporting hot material
WO1989005732A1 (en) * 1987-12-21 1989-06-29 Kinyosha Co., Ltd Ink roller for printing press and production thereof

Also Published As

Publication number Publication date
NO902722D0 (en) 1990-06-19
ATE94431T1 (en) 1993-10-15
ES2045640T3 (en) 1994-01-16
US5103759A (en) 1992-04-14
JPH0352667A (en) 1991-03-06
NO902722L (en) 1991-01-21
NO175684B (en) 1994-08-08
CA2021479A1 (en) 1991-01-20
DE3923850A1 (en) 1991-01-31
EP0413095A2 (en) 1991-02-20
NO175684C (en) 1994-11-16
EP0413095A3 (en) 1991-11-21
FI903601A0 (en) 1990-07-17
BR9003252A (en) 1991-08-27

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