EP1027470B1 - Rakelstab verwendbar in der papierindustrie - Google Patents

Rakelstab verwendbar in der papierindustrie Download PDF

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Publication number
EP1027470B1
EP1027470B1 EP98952799A EP98952799A EP1027470B1 EP 1027470 B1 EP1027470 B1 EP 1027470B1 EP 98952799 A EP98952799 A EP 98952799A EP 98952799 A EP98952799 A EP 98952799A EP 1027470 B1 EP1027470 B1 EP 1027470B1
Authority
EP
European Patent Office
Prior art keywords
coating
mixture
coating rod
rod according
bar
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
EP98952799A
Other languages
English (en)
French (fr)
Other versions
EP1027470A1 (de
Inventor
Peter Brodbeck
Christian Coddet
Bernard Hansz
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.)
BTG Eclepens SA
Original Assignee
BTG Eclepens SA
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 BTG Eclepens SA filed Critical BTG Eclepens SA
Publication of EP1027470A1 publication Critical patent/EP1027470A1/de
Application granted granted Critical
Publication of EP1027470B1 publication Critical patent/EP1027470B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/4956—Fabricating and shaping roller work contacting surface element
    • Y10T29/49563—Fabricating and shaping roller work contacting surface element with coating or casting about a core

Definitions

  • the present invention relates to a sleeping bar for the paper industry.
  • the sleeping bar or rod is used in industry paper mill to bring a coating material (or "sauce") generally on cardboard or paper to make a cardboard or paper layer.
  • the sleeping bar consists of a metal rod having a diameter generally between 10 and 20 mm. Bar is generally kept in any support such as that a polymer sheath, also called a bed, in which it can turn.
  • the sleeping bar by turning, constitutes in some so a doctor blade that removes excess coating material or "sauce” on paper, dosing the coating material or obtaining a desired thickness of material on paper, being obtained by varying the pressure for applying the coating bar to the paper and / or varying the speed of rotation.
  • Coated paper is a strong paper added value and in general of very high quality, the paper being obtained in depositing two or three layers of coating material on each side.
  • the machines include four or more sleeping heads. he It follows that intensive use of the coating bars in the manufacturing leads to rapid wear of said bars, said wear being accelerated when using pigmented coating material due to the high abrasion of pigments on the coating bars. The consequence of this rapid wear is that it is necessary to change the sleeping bars from each machine every two days. As currently the machines each includes eight sleeping bars, you can easily measure the economic impact of coating bars on papermaking.
  • the object of the present invention is to propose a sleeping bar smooth or grooved, the service life of which has been considerably increased, by at least minus 50%.
  • An object of the present invention is to provide a coating bar which is coated with a coating constituted by a mixture of ceramics, said coating having a wetting or wetting angle between 30 ° and 90 ° and a porosity of less than 5%, the size of the pores not exceeding 5 ⁇ m.
  • the The behavior of the coating material may vary from one situation to another. Indeed, it has been found that it is necessary that the surface tension between the transfer cylinder and the coating material had to be higher than the tension existing between said coating material and the coating bar, if we want all or almost all of the coating material contained, for example example, in the hollow of the grooves is transferred. Therefore, if the wettability of the coating of the coating bar is not sufficient, then it produces dry friction between the coating and the coating material; if the wettability is too high, then at least some of the material coating remains on the coating, for example in the bottom of the grooves. In the latter case, the grooves no longer perfectly play their role of dosage since a certain amount of coating material remains trapped in the bottom of the grooves.
  • the angle of coating wettability or wettability is between 30 ° and 90 ° and, preferably between 60 ° and 85 °.
  • the wettability of the coating of the bar is modified coating, by varying certain parameters of said coating, such as the porosity or size of the pores, the structure of the coating, for example at within the network of the ceramic mixture used to constitute said coating.
  • the coating may consist of grains of juxtaposed ceramics, it will be preferable, in some cases, to vary the concentration or molar content of the ceramics used in the mixed.
  • the present invention recommends using in said mixture a main constituent whose molar content is between 40 and 60%.
  • the coating is obtained by spraying onto the coating bar, a powder of agglomerated ceramic grains or of sintered or split agglomerated grains ground with a size of each agglomerate of less than 5 ⁇ m and, preferably, of the order of a micrometer.
  • the particle size of the sprayed powder is less than 80 ⁇ m and preferably between 10 and 45 ⁇ m .
  • the coating thus obtained has a thickness of between 15 and 60 ⁇ m and a porosity of less than 5% with an average pore size of less than 5 ⁇ m .
  • the preferred ceramics according to the invention are chosen from Cr 2 O 3 , MgO, Al 2 O 3 , TiO 2 , SiO 2 and ZrO 2 .
  • a particular mixture consists of 50% Cr 2 O 3 and 50% MgO.
  • the coating bar is maintained at a temperature below 50 ° C by means of a CO 2 jet for example.
  • the final coating obtained according to the invention has a certain surface roughness which it is necessary to eliminate in large part so as not to alter the surface condition of the finished coating bar.
  • a treatment is applied to the coated coating bar so as to obtain a surface roughness of less than 1 ⁇ m .
  • the surface treatment may for example be wet polishing.
  • Another treatment consists in placing the coating bar in a rubber roller or between two rubber rollers which rotate on the coating bar, the coating bar-rubber roller assembly being immersed in a slip loaded with 50% by volume.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Glass Compositions (AREA)
  • Paper (AREA)
  • Liquid Crystal Substances (AREA)
  • Materials For Medical Uses (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)

Claims (8)

  1. Streichstange, umfassend ein Substrat, das zumindest auf dem größten Teil seiner Länge mit einem Überzug versehen ist, der eine Keramik enthält, deren Porosität unter 5% liegt, dadurch gekennzeichnet, dass der genannte Überzug durch ein Keramikgemisch gebildet wird, wobei der genannte Überzug einen Benetzungswinkel zwischen 30° und 90° und eine Porengröße von unter 5 µm aufweist.
  2. Streichstange nach Anspruch 1, dadurch gekennzeichnet, dass das Keramikgemisch einen Hauptbestandteil enthält, dessen Molgehalt zwischen 40 und 60% in Bezug auf den Gesamtgehalt des Gemisches beträgt.
  3. Streichstange nach Anspruch 1, dadurch gekennzeichnet, dass der Benetzungswinkel zwischen 60° und 85° beträgt.
  4. Streichstange nach Anspruch 1, dadurch gekennzeichnet, dass der Überzug eine Oberflächenrauheit von unter 1 µm aufweist.
  5. Streichstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Keramiken aus Cr2O3, MgO, Al2O3, TiO2, SiO2 und ZrO2 gewählt werden.
  6. Streichstange nach Anspruch 5, dadurch gekennzeichnet, dass das Gemisch aus 50 Mol% Cr2O3 und MgO besteht.
  7. Streichstange nach Anspruch 5, dadurch gekennzeichnet, dass das Gemisch einen Molgehalt von
    48% Al2O3,
    35% TiO2,
    15% Cr2O3,
    2% SiO2
    aufweist.
  8. Streichstange nach Anspruch 5, dadurch gekennzeichnet, dass das Gemisch aus ZrO2, Al2O3, SiO2 und TiO2 gebildet wird.
EP98952799A 1997-10-27 1998-10-27 Rakelstab verwendbar in der papierindustrie Expired - Lifetime EP1027470B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9713450 1997-10-27
FR9713450A FR2770234B1 (fr) 1997-10-27 1997-10-27 Barre de couchage pour l'industrie papetiere
PCT/FR1998/002299 WO1999022040A1 (fr) 1997-10-27 1998-10-27 Barre de couchage pour l'industrie papetiere

Publications (2)

Publication Number Publication Date
EP1027470A1 EP1027470A1 (de) 2000-08-16
EP1027470B1 true EP1027470B1 (de) 2001-08-08

Family

ID=9512694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98952799A Expired - Lifetime EP1027470B1 (de) 1997-10-27 1998-10-27 Rakelstab verwendbar in der papierindustrie

Country Status (7)

Country Link
US (1) US6666807B2 (de)
EP (1) EP1027470B1 (de)
JP (1) JP3553877B2 (de)
AT (1) ATE204027T1 (de)
DE (1) DE69801338T2 (de)
FR (1) FR2770234B1 (de)
WO (1) WO1999022040A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002239431A (ja) * 2001-02-13 2002-08-27 Mitsubishi Heavy Ind Ltd 塗工装置及び塗工紙の製造方法
JP4460257B2 (ja) * 2003-10-02 2010-05-12 富士フイルム株式会社 塗工用ロッド及びその製造方法
SE0403178D0 (sv) 2004-12-28 2004-12-28 Btg Eclepens Sa Method of manufacturing a coating or doctoring blade
US7263981B2 (en) 2005-05-23 2007-09-04 Walbro Engine Management, L.L.C. Controlling evaporative emissions in a fuel system
DE102009029698A1 (de) 2009-09-23 2011-03-24 Voith Patent Gmbh Klingenbeschichtung
DE102010005389A1 (de) * 2010-01-22 2011-07-28 MTU Aero Engines GmbH, 80995 Strukturierte Oberflächenbeschichtung mittels kinetischem Kaltgasspritzen
CN104762583A (zh) * 2015-01-06 2015-07-08 马鞍山蓝科再制造技术有限公司 一种热喷涂模具表面用纳米陶瓷材料的制备方法
FI129111B (en) * 2018-06-20 2021-07-15 Kemira Oyj Coating structure, sheet-like product and its use

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SE437682B (sv) * 1982-10-13 1985-03-11 Inventing Ab Sett och anleggning for att applicera en notningsbestendig beleggning pa ett tunnt metalliskt, bandformigt berarmaterial
SE437681B (sv) * 1982-10-13 1985-03-11 Inventing Ab Schaber eller rakel for kontrollerbar paforing och utjemning av bestrykningsmedel pa en lopande pappersbana
US4621936A (en) * 1983-10-14 1986-11-11 Corning Glass Works Zirconia pen balls
US4856161A (en) * 1985-01-09 1989-08-15 Valmet Oy Press roll
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US4626516A (en) * 1985-07-31 1986-12-02 General Electric Company Infiltration of Mo-containing material with silicon
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Also Published As

Publication number Publication date
US20030092549A1 (en) 2003-05-15
JP2001521063A (ja) 2001-11-06
WO1999022040A1 (fr) 1999-05-06
FR2770234A1 (fr) 1999-04-30
DE69801338T2 (de) 2002-06-20
JP3553877B2 (ja) 2004-08-11
FR2770234B1 (fr) 1999-12-24
EP1027470A1 (de) 2000-08-16
US6666807B2 (en) 2003-12-23
DE69801338D1 (de) 2001-09-13
ATE204027T1 (de) 2001-08-15

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