WO2000058555A1 - Support revetu et tige dans un appareil de revetement a bande de type tige - Google Patents

Support revetu et tige dans un appareil de revetement a bande de type tige Download PDF

Info

Publication number
WO2000058555A1
WO2000058555A1 PCT/FI2000/000241 FI0000241W WO0058555A1 WO 2000058555 A1 WO2000058555 A1 WO 2000058555A1 FI 0000241 W FI0000241 W FI 0000241W WO 0058555 A1 WO0058555 A1 WO 0058555A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod
cradle
surfacing layer
doctor
doctor according
Prior art date
Application number
PCT/FI2000/000241
Other languages
English (en)
Inventor
Petri Parni
Atte Takkinen
Original Assignee
Metso Paper, Inc.
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 Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to DE10084391T priority Critical patent/DE10084391B3/de
Priority to AU35613/00A priority patent/AU3561300A/en
Publication of WO2000058555A1 publication Critical patent/WO2000058555A1/fr
Priority to SE0103195A priority patent/SE523538C2/sv

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • 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 present invention relates to a rod doctor according to the preamble of claim 1.
  • the coating mix is first applied to the surface of a moving web, whereupon the excess coating is removed from the surface of the web and the coating layer is smoothed. Finally, the excess moisture content of the coating is removed in dryers.
  • a doctor blade is used for metering the applied amount of coat and smoothing the surface of the applied coating.
  • a rod doctor an air doctor or different kinds of rolls or scrapers can be used in the metering of the coating mix.
  • the doctor blade of a blade coater can be replaced by a doctor rod.
  • the rod doctor comprises a framework, which extends over the cross-machine width of the paper/boardmaking machine and has connected thereto a flexible loading hose, and a cradle into which the doctor rod is rotatingly mounted.
  • the rod is rotated in the cradle by means of a drive mechanism generally in a reverse direction to the travel direction of the moving web.
  • the cradle is fabricated from a polymeric material, but may also be made from metal materials, for instance.
  • the doctor rod may be made from a polymeric or metal material .
  • a problem generally occurring in conventional rod doctor constructions is vibration of the rod that makes the applied coat layer uneven after leveling. Such vibration also causes clearly detectable pulsation in the running of the rod drive motors.
  • a plausible cause of the vibration is the high friction between the cradle and the rod rotating therein. The amplitude of the vibration has also been found to increase as the paper/boardmaking machines become wider.
  • the gap between the cradle and the rod can be filled with water that acts as a lubricant.
  • the lubricating water may leak from the cradle into the coating mix thus diluting the coating and deteriorating the quality of the applied coat.
  • Another problem typically handicapping rod doctor assem- blies is a rapid wear of the rod and its support cradle that also causes unevennes ⁇ on the applied coat.
  • Cradles made from urethane polymers have been found particularly prone to a fast wear.
  • Attempts have been made to slow down the wear rate by means different ways, e.g., by coating the rod with a chromium, a glass/carbon- fiber or ceramic surface coatings, but these measures only serve to improve the wear resistance of the rod without exhibiting any essential reduction of the friction between the rod and the cradle.
  • the goal of the invention is achieved by way of surfacing at least the cradle of the rod doctor by a thin surface coating layer.
  • a surface coating may also be made on the rod that supportedly rotates in the cradle.
  • the surface coating used herein is selected from a group of hard materials having good sliding and self- lubricating properties, whereby the coefficient of friction between the cradle and the rod rotating therein is reduced.
  • the coating layer may be fabricated using, e.g., so-called vacuum deposition techniques, one of which is physical vapor deposition.
  • the leveling rod according to the invention is characterized by what is stated in the characterizing part of claim 1.
  • the invention offers significant benefits.
  • the sliding conditions between the rod and the cradle are improved, whereby the rod vibration and the problems associated therewith are reduced or even eliminated entirely.
  • the drive mechanisms of a lower power rating than those of the prior art may be used for rotating the rod.
  • the wear rate of the rod and its cradle is reduced resulting in less frequent need for leveling rod unit maintenance and giving a longer life.
  • the rod can be rotated in its cradle without necessarily needing any lubricating water, whereby the web coating problems caused by water leakage are eliminated.
  • the construction of the leveling rod unit is simplified, because no connections or other specific means for the lubrication water circulation are required.
  • the surface coating also serves to improve the corrosion resistance of the cradle and the rod .
  • Figure 1 shows a first embodiment of a rod doctor according to the invention having its cradle surfaced
  • Figure 2 shows another embodiment of a rod doctor according to the invention having both the cradle and the rod surfaced.
  • the leveling rod unit shown in figure 1 comprises support frame elements 2, 8 extending over the entire width of the paper/boardmaking machine and having a flexible loading hose 4 mounted therebetween.
  • a cradle 3 Into the support frame element 2 is adapted a cradle 3 having a rod 1 adapted to supportedly rotate therein.
  • the rod 1 is rotated by means of a drive mechanism, typically reverse to the travel direction of a web 5 being coated.
  • the rod 1 is pressed by means of the loading hose 4 against the web 5 being coated, whereby the excess coating mix applied to the surface of the web 5 is removed and the applied coating layer is smoothed.
  • the cradle 3 is covered by a surfacing layer 6 with a thickness typically varying from a few nanometers to a few tens of micrometers.
  • the layer 6 is selected from the group of hard materials exhibiting good sliding and self -lubricating properties.
  • both the leveling rod cradle 3 and the rod 1 rotatingly mounted therein are provided with a surfacing layer 6, 7.
  • the surfacing layer 7 serves to improve the wear resistance of the rod 1 and to reduce the coefficient of friction between the cradle 3 and the rod 1.
  • the surfacing layer 7 of the rod 1 may be of the same material as that of the surfacing layer 6 of the cradle 3. Normally, the surfacing layers 6, 7 are made from different materials, whereby the seizing tendency and wear rate of the sliding surfaces are generally reduced.
  • the surfacing layers 6, 7 may be formed by means of, e.g., vacuum deposition techniques.
  • vacuum deposition method is the so-called physical vapor deposition (PVD) , wherein the deposition process is carried out under a vacuum or in a low-pressure chamber into which the gas-phase coating material is introduced.
  • PVD physical vapor deposition
  • the coating material is vaporized by means of an electron beam or resistive heating. Transported in the gas phase, the coating material adheres to the surface of the object being surfaced.
  • the coating process can be performed at an elevated temperature of about 400-500 °C .
  • a surfacing layer fabricated by vacuum deposition tech- niques is comparatively thin; its thickness typically varies from 1 nm to 90 m. In spite of its infinitesimal thickness, the surfacing layer is entirely free from pores and conforms without cracks to the contour of the object being coated as the layer is produced at an atomic layer deposition level.
  • the substrate to be surfaced by vacuum deposition can be of almost any material such as a metal, stone, plastic or glass.
  • the surfacing materials used herein are selected from the groups of metals, metal alloys, oxides, nitrides or carbides. Different kinds of surface coatings may vary vastly in terms of their properties .
  • the surfacing layers 6, 7 of the cradle 3 and the rod 1 may be, e.g., a silicon molybdenum alloy in which silicon makes the surfacing layer 6, 7 hard, while molybdenum gives the favorable self -lubricating and sliding properties.
  • a surface coating is a vacuum-deposited layer of diamond (DLC, Diamond Layer Coating) having a hardness typically in the range of 6,000 - 10,000 HV. This coating is highly resistant to acids and bases.
  • a diamond coating gives a very low coefficient of friction against most other materials. For instance, the coefficient of friction between steel and a diamond coating is typically 0.1 in a sliding contact of dry surfaces that is only one-fifth of the coefficient of friction between two sliding steel surfaces under similar conditions.
  • Other advantageous surfacing layer materials in an embodiment according to the invention are chromium and cromium- teflon composition.
  • the invention may have alternative embodiments.
  • the technique used for applying the surface coating may be selected rather freely.
  • the coating process may be performed using, e.g., thermal spraying in which the coating material is molten into a hot plasma that is directed to impinge on the surface of the object to be coated.
  • the coating materials are generally metals and plastics such as chromium, molybdenum or teflon.
  • the rod doctor according to the invention may be used for metering the amount of coating mix applied to the appli- cator roll surface in a film-transfer coater and for leveling the applied coat.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne une raclette en forme de tige destinée à mesurer la quantité de mélange de revêtement appliquée sur la surface d'une bande défilant (5) de carton ou papier ou sur la surface d'applicateur à rouleau dans un dispositif de revêtement à transfert de film. Cette raclette est aussi destinée à niveler le revêtement appliqué. Elle comprend un élément cadre de support (2), une entaille de guidage (3) adaptée dans l'élément cadre de support (2) et une tige conçue pour tourner dans l'entaille (3). Les surfaces de l'entaille (3) sur lesquelles la tige (1) tourne sont revêtues d'une couche de surface (6) servant à améliorer la résistance à l'usure et le frottement de glissement de ces surfaces.
PCT/FI2000/000241 1999-03-26 2000-03-23 Support revetu et tige dans un appareil de revetement a bande de type tige WO2000058555A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10084391T DE10084391B3 (de) 1999-03-26 2000-03-23 Rakelbett und Rakel in einer Rollrakelstreichvorrichtung
AU35613/00A AU3561300A (en) 1999-03-26 2000-03-23 Coated holder and rod in a rod-type web coating apparatus
SE0103195A SE523538C2 (sv) 1999-03-26 2001-09-26 Belagd hållare och stav i en banbestrykningsanordning av stavtyp

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990684 1999-03-26
FI990684A FI106139B (fi) 1999-03-26 1999-03-26 Sauvakaavin

Publications (1)

Publication Number Publication Date
WO2000058555A1 true WO2000058555A1 (fr) 2000-10-05

Family

ID=8554297

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000241 WO2000058555A1 (fr) 1999-03-26 2000-03-23 Support revetu et tige dans un appareil de revetement a bande de type tige

Country Status (5)

Country Link
AU (1) AU3561300A (fr)
DE (1) DE10084391B3 (fr)
FI (1) FI106139B (fr)
SE (1) SE523538C2 (fr)
WO (1) WO2000058555A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005061798A1 (fr) 2003-12-22 2005-07-07 Metso Paper, Inc. Palier d'axe de bobine de films, revetements ou materiaux d'etancheite
EP1567284A1 (fr) * 2002-12-06 2005-08-31 Stora Enso North America Corporation Appareil a racle
WO2005110621A1 (fr) * 2004-05-14 2005-11-24 Voith Patent Gmbh Support de racle
WO2007027150A1 (fr) * 2005-08-30 2007-03-08 Mattssonföretagen I Uddevalla Aktiebolag Dispositif et procédé de couchage
EP1954880A1 (fr) * 2005-12-02 2008-08-13 Metso Paper, Inc. Palier d axe, insert à utiliser dans un palier d axe et procédé pour introduire un axe dans un palier d axe
WO2010136377A1 (fr) * 2009-05-27 2010-12-02 Voith Patent Gmbh Dispositif de racloir
DE102011112956A1 (de) * 2011-09-13 2013-03-14 Horst Sprenger Gmbh Rakel-Dosiersystem
US20140083354A1 (en) * 2012-09-27 2014-03-27 Metso Paper, Inc. Rod-bed assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009050917B3 (de) 2009-10-23 2010-10-07 Salzgitter Mannesmann Präzisrohr GmbH Rakelstange für Dosiersysteme zum Verteilen und Abstreifen eines flüssigen oder viskosen Mediums auf laufenden Materialbahnen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1281931A (en) * 1968-12-18 1972-07-19 Beloit Corp Doctor blade roll assembly
SE377056B (fr) * 1970-02-17 1975-06-23 Feldmuehle Anlagen Prod
US4245582A (en) * 1979-02-02 1981-01-20 Beloit Corporation Adjustable rod holder for metering rod coaters
US5264247A (en) * 1990-09-14 1993-11-23 Valmet Paper Machinery Inc. Process for the manufacture of a coating bar for a bar coater
DE19626580A1 (de) * 1996-07-02 1998-01-08 Jagenberg Papiertech Gmbh Dosiersystem für Vorrichtungen zum Beschichten von Materialbahnen, insbesondere Papier- oder Kartonbahnen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3703834A1 (de) * 1987-02-07 1988-08-18 Jagenberg Ag Rollschaberauftragwerk zum auftragen von beschichtungen auf materialbahnen
DE4123326C2 (de) * 1991-07-15 1994-11-17 Horst Sprenger Gmbh Rakelwelle für Streich- und Beschichtungsanlagen sowie für Leim- und Filmpressen
DE19606459A1 (de) * 1996-02-21 1997-08-28 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtungen zum Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1281931A (en) * 1968-12-18 1972-07-19 Beloit Corp Doctor blade roll assembly
SE377056B (fr) * 1970-02-17 1975-06-23 Feldmuehle Anlagen Prod
US4245582A (en) * 1979-02-02 1981-01-20 Beloit Corporation Adjustable rod holder for metering rod coaters
US5264247A (en) * 1990-09-14 1993-11-23 Valmet Paper Machinery Inc. Process for the manufacture of a coating bar for a bar coater
DE19626580A1 (de) * 1996-07-02 1998-01-08 Jagenberg Papiertech Gmbh Dosiersystem für Vorrichtungen zum Beschichten von Materialbahnen, insbesondere Papier- oder Kartonbahnen

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1567284A1 (fr) * 2002-12-06 2005-08-31 Stora Enso North America Corporation Appareil a racle
EP1567284A4 (fr) * 2002-12-06 2006-04-05 Stora Enso North America Corp Appareil a racle
JP2007515274A (ja) * 2003-12-22 2007-06-14 メッツォ ペーパー インコーポレイテッド フィルム、コーティング、又はシーリングロッド用のクレードル
WO2005061798A1 (fr) 2003-12-22 2005-07-07 Metso Paper, Inc. Palier d'axe de bobine de films, revetements ou materiaux d'etancheite
US7798093B2 (en) 2003-12-22 2010-09-21 Metso Paper, Inc. Rod cradle for a film, coating or sealing rod
WO2005110621A1 (fr) * 2004-05-14 2005-11-24 Voith Patent Gmbh Support de racle
CN100441319C (zh) * 2004-05-14 2008-12-10 沃依特专利有限责任公司 刮刀床
US8286577B2 (en) 2005-08-30 2012-10-16 Mattssonforetagen I Uddevalla Aktiebolag Device and method for coating
WO2007027150A1 (fr) * 2005-08-30 2007-03-08 Mattssonföretagen I Uddevalla Aktiebolag Dispositif et procédé de couchage
EP1954880A1 (fr) * 2005-12-02 2008-08-13 Metso Paper, Inc. Palier d axe, insert à utiliser dans un palier d axe et procédé pour introduire un axe dans un palier d axe
EP1954880A4 (fr) * 2005-12-02 2012-01-25 Metso Paper Inc Palier d axe, insert à utiliser dans un palier d axe et procédé pour introduire un axe dans un palier d axe
WO2010136377A1 (fr) * 2009-05-27 2010-12-02 Voith Patent Gmbh Dispositif de racloir
DE102011112956A1 (de) * 2011-09-13 2013-03-14 Horst Sprenger Gmbh Rakel-Dosiersystem
US20140083354A1 (en) * 2012-09-27 2014-03-27 Metso Paper, Inc. Rod-bed assembly
US9205450B2 (en) * 2012-09-27 2015-12-08 Valmet Technologies, Inc. Rod-bed assembly

Also Published As

Publication number Publication date
FI106139B (fi) 2000-11-30
DE10084391B3 (de) 2013-02-21
FI990684A0 (fi) 1999-03-26
SE0103195D0 (sv) 2001-09-26
SE0103195L (sv) 2001-11-27
FI990684A (fi) 2000-09-27
SE523538C2 (sv) 2004-04-27
DE10084391T1 (de) 2003-07-03
AU3561300A (en) 2000-10-16

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