WO1999012726A1 - Caring doctor blade and method for manufacture of same - Google Patents

Caring doctor blade and method for manufacture of same Download PDF

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Publication number
WO1999012726A1
WO1999012726A1 PCT/FI1998/000690 FI9800690W WO9912726A1 WO 1999012726 A1 WO1999012726 A1 WO 1999012726A1 FI 9800690 W FI9800690 W FI 9800690W WO 9912726 A1 WO9912726 A1 WO 9912726A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
doctor blade
layers
carbon fibre
grinding particles
Prior art date
Application number
PCT/FI1998/000690
Other languages
French (fr)
Inventor
Ilkka Rata
Juha Vestola
Original Assignee
Valmet Corporation
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 Valmet Corporation filed Critical Valmet Corporation
Priority to DE69804427T priority Critical patent/DE69804427T2/en
Priority to CA002270770A priority patent/CA2270770C/en
Priority to US09/297,627 priority patent/US6416843B1/en
Priority to AT98942708T priority patent/ATE215012T1/en
Priority to EP98942708A priority patent/EP0944470B1/en
Priority to AU90740/98A priority patent/AU9074098A/en
Publication of WO1999012726A1 publication Critical patent/WO1999012726A1/en
Priority to NO20001206A priority patent/NO319535B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
    • B29C70/021—Combinations of fibrous reinforcement and non-fibrous material
    • B29C70/025—Combinations of fibrous reinforcement and non-fibrous material with particular filler
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24174—Structurally defined web or sheet [e.g., overall dimension, etc.] including sheet or component perpendicular to plane of web or sheet
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers

Definitions

  • the invention concerns a caring doctor blade for a paper/board machine and a method for manufacture of same.
  • doctor blades are employed.
  • Typical commercial blades are described, for example, in the US Patent 4,549,933 and in the SU Patent 1,694,755.
  • a doctor blade for a paper machine which consists of a number of alternating layers of fibre and carbon fibre so that the fibre layer may be composed of cotton, paper, fibreglass, or equivalent.
  • Such a blade detaches contaminations, but, on the other, foreign material is separated from the blade onto the roll face.
  • a doctor blade meant for cleaning of rolls and cylinders is described for use in pulp and paper industry.
  • This blade is made of a composite material, in which, over the thickness of the blade, layers of fibre and fabric filler perpendicular to the blade edge alternate.
  • This doctor blade is used for cleaning of the roll faces.
  • the fabric filler for the doctor, carbon band, boron fibre or tungsten is used as fibre, and the alignment of the fibres is perpendicular to the direction of the blade.
  • a polishing doctor blade for polishing the metal face of a calender roll.
  • the machining face placed at the head of the blade comprises grinding particles mixed with an epoxy matrix, such as carbides or diamonds.
  • the blade does not operate as a doctoring blade. It is meant exclusively for calender rolls, at which its function is exclusively to grind/polish the face of the calender roll.
  • FI Patent Application No. 941620 a method and an equipment are described for conditioning of the coating on a roll in a paper machine. What is concerned is not a doctor blade, but in the method of FI-941620 the roll is ground by means of a separate grinding rib to be attached to a doctor blade so as to correct the roughness of the roll face to make the face either smoother or rougher, as required. In such a case, the conditioning of the roll face takes place during a standstill on-site, i.e without removing the roll from the machine, but the device does not operate during production or at a production speed.
  • Coating with a foreign material often results in alteration of the surface properties of a roll, which again deteriorates the runnability and the properties of paper. If the coating is intensive, the roll face may become excessively smooth, which results, on a centre roll in the press, for example, in more difficult separation of the paper web, passing of the web through the doctor, and, thus, in increased susceptibility of web breaks. Besides the coating effect, a second negative aspect in the case of metal blades is scratching of the roll face or, in some cases, penetration of the blade into the roll coating if a polymer-based coating is concerned. Also, excessive roughening of a roll face, which occurs with prolonged operation of metal blades, causes deterioration of the operating capacity of the roll face.
  • Smoothing or roughening of a roll face is typical of a roll that contains ceramic coating material, but it also occurs with other coatings.
  • the coating effect of the blades of reinforced plastic commonly employed with ceramic roll coatings mainly results from adhesion of particles detached from the blade by abrasion or from melting of the matrix plastic onto the roll face.
  • materials coming from the process also adhere to the roll face, which materials cannot be removed by the doctor from the recesses in the roughness of the face, as the doctor cannot remove the layer of impurities deposited on these materials "anchored" on the bottom of said recesses either, because the adhesion is too strong.
  • doctor blade Even the best conventional doctor blade cannot remove all the undesirable material already adhering to the roll face from the roll face, but the blade often brings more material to the roll face. This is why there has been a need to develop a doctor blade which removes undesirable contaminations or other material coated onto the roll face from the roll face to a greater extent than the blade itself brings onto the roll face and which doctor blade keeps the roll face in its original condition or restores it to its original condition.
  • the object of the present invention is a caring doctor blade for a paper/board machine, which blade removes undesirable coated material from the roll face and, at the same time, services the roll face, and a method for manufacture of such a blade.
  • doctor blade in accordance with the present invention and the method for manufacture of same are characterized in what is stated in the patent claims.
  • the problems involved in the prior-art solutions are avoided and the objectives that have been set are achieved.
  • the caring doctor blade is not supposed to be exclusively abrasive, as the conventional abrasive blades are, but it is also supposed to have excellent doctoring and cleaning properties.
  • the functions of two different blade types are combined.
  • the blade is a carbon-fibre/fibreglass composite, which contains a grinding material in a layer that contains fibreglass or carbon fibre. The content of carbon fibre in the composite is high, the content of the matrix material is low, and the fibre orientation is optimal.
  • the doctor blade as shown in Fig. 1 comprises a rigid laminate structure consisting of fibreglass and carbon fibre layers 2 and 3 and of at least one caring layer 1.
  • the caring layer 1 is surrounded by fibreglass layers and possibly by carbon fibre layers.
  • the carbon fibre layers 3 may also contain fibreglass.
  • the fibreglass layers 2 are orientated parallel to the longitudinal axis of the blade, and in at least some of the layers that contain carbon fibre, the carbon fibres are orientated substantially obliquely to the longitudinal axis of the doctor blade, preferably transversely to the blade direction.
  • the topmost layers 4 are preferably mats with fibreglass surface.
  • the caring layer 1 comprises carbon fibres and grinding particles in direct vicinity of the carbon fibres, possibly additionally also glass fibres.
  • the grinding particles it is possible to employ silicon carbide particles, diamond, boron nitride, aluminum oxide, or equivalent, the preferable one being silicon carbide.
  • the grinding particles have been introduced into connection with the carbon fibres, for example, by impregnating into a carbon fibre fabric by means of a matrix material, which can be thermosetting or thermoplastic resin, and its basic matrix can be fluorinated.
  • the nature of the grinding agent (silicon carbide, diamonds, boron nitride, aluminium oxide, or equivalent; preferably silicon carbide) and the particle size (30 ... 250 ⁇ m; preferably 45 ... 125 ⁇ m) and the amount of particles on the wear face placed against the roll are chosen appropriately.
  • the amount can be changed by adjusting the density of particles in the layer and/or by increasing the number of the layers that contain particles, for example 1...5 layers.
  • the duration of the grinding effect can be regulated by fitting the particles on a certain distance within the wear margin only. In this way the grinding effect can be standardized in the cross direction of the whole roll even if the rate of wear of the blade in different areas were different. When expensive grinding materials are used, it is preferable to place the particles in the area of the wear margin only.
  • the thickness of the doctor blade is preferably about 1.3 ... 2.8 mm, while the thicknesses of the individual layers are of an order of about 0.1 ... 0.3 mm, the caring layer about 0.1 ... 0.4 mm.
  • the doctor blade is manufactured preferably by means of a pultrusion method. In such a case, the grinding material is brought into connection with the carbon fibre fabric, for example impregnated into said fabric, before the pultrusion stage. Also, conventional methods known from the manufacture of sandwich constructions can be employed.
  • the grinding, hard particles, for example silicon carbide are surrounded by carbon fibre.
  • the function of the carbon fibre is to conduct the arising friction heat away from the grinding particles so that the matrix material around the particles of grinding material does not burn or melt, with resulting removal of the grinding particles.
  • a substantially cross-direction orientation of the carbon fibres provides good conductivity of heat away from the tip of the blade, i.e. away from the matrix which constitutes the fixing agent for the grinding material and from the particles of grinding material, in which case the melting of the matrix is reduced. Further, the rigidity of the blade in the cross direction is high, which improves the doctoring result.
  • the blade is, however, resilient in the longitudinal direction of the blade, in which case the blade follows the roll face and complies with the roll face well over the entire length of the blade.
  • Such a doctor blade operates excellently as a shearing blade, in addition to the abrading effect; a conventional abrasive blade cannot cut off the impurities.
  • a single blade a multiple effect is obtained, which provides evident advantages also in a case in which, on the rolls, both a grinding blade and a shearing blade can be used separately in a doctor.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Centrifugal Separators (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Prostheses (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention concerns a caring doctor blade for a paper/board machine, which blade comprises layers of fibreglass and carbon fibre and a caring layer as a rigid laminated structure, which caring layer comprises carbon fibres and grinding particles in direct vicinity of the carbon fibres. The orientation of the fibreglass layers is parallel to the longitudinal axis of the blade, and at least in some of the layers that contain carbon fibre the orientation of the carbon fibres is substantially diverging from the direction of the longitudinal axis of the blade. The invention also concerns a method for manufacture of a doctor blade for a paper/board machine by means of a pultrusion method.

Description

Caring doctor blade and method for manufacture of same
The invention concerns a caring doctor blade for a paper/board machine and a method for manufacture of same.
The faces of the rolls in a paper/board machine tend to be coated with impurities coming from the process and with material of the doctor blade. For removal of these materials from the roll faces, doctor blades are employed.
Typical commercial blades are described, for example, in the US Patent 4,549,933 and in the SU Patent 1,694,755.
In the US Patent No. 4,549,933, a doctor blade for a paper machine is described, which consists of a number of alternating layers of fibre and carbon fibre so that the fibre layer may be composed of cotton, paper, fibreglass, or equivalent. Such a blade detaches contaminations, but, on the other, foreign material is separated from the blade onto the roll face.
In the SU Patent No. 1,694, 755, a doctor blade meant for cleaning of rolls and cylinders is described for use in pulp and paper industry. This blade is made of a composite material, in which, over the thickness of the blade, layers of fibre and fabric filler perpendicular to the blade edge alternate. This doctor blade is used for cleaning of the roll faces. Besides the fabric filler, for the doctor, carbon band, boron fibre or tungsten is used as fibre, and the alignment of the fibres is perpendicular to the direction of the blade.
None of said blade constructions contains particles of abrasive material. In the US Patent No. 5,174,862, a polishing doctor blade is described for polishing the metal face of a calender roll. The machining face placed at the head of the blade comprises grinding particles mixed with an epoxy matrix, such as carbides or diamonds. The blade does not operate as a doctoring blade. It is meant exclusively for calender rolls, at which its function is exclusively to grind/polish the face of the calender roll.
In the FI Patent Application No. 941620, a method and an equipment are described for conditioning of the coating on a roll in a paper machine. What is concerned is not a doctor blade, but in the method of FI-941620 the roll is ground by means of a separate grinding rib to be attached to a doctor blade so as to correct the roughness of the roll face to make the face either smoother or rougher, as required. In such a case, the conditioning of the roll face takes place during a standstill on-site, i.e without removing the roll from the machine, but the device does not operate during production or at a production speed.
Coating with a foreign material often results in alteration of the surface properties of a roll, which again deteriorates the runnability and the properties of paper. If the coating is intensive, the roll face may become excessively smooth, which results, on a centre roll in the press, for example, in more difficult separation of the paper web, passing of the web through the doctor, and, thus, in increased susceptibility of web breaks. Besides the coating effect, a second negative aspect in the case of metal blades is scratching of the roll face or, in some cases, penetration of the blade into the roll coating if a polymer-based coating is concerned. Also, excessive roughening of a roll face, which occurs with prolonged operation of metal blades, causes deterioration of the operating capacity of the roll face.
Smoothing or roughening of a roll face is typical of a roll that contains ceramic coating material, but it also occurs with other coatings. The coating effect of the blades of reinforced plastic commonly employed with ceramic roll coatings mainly results from adhesion of particles detached from the blade by abrasion or from melting of the matrix plastic onto the roll face. On the other hand, materials coming from the process also adhere to the roll face, which materials cannot be removed by the doctor from the recesses in the roughness of the face, as the doctor cannot remove the layer of impurities deposited on these materials "anchored" on the bottom of said recesses either, because the adhesion is too strong.
Even the best conventional doctor blade cannot remove all the undesirable material already adhering to the roll face from the roll face, but the blade often brings more material to the roll face. This is why there has been a need to develop a doctor blade which removes undesirable contaminations or other material coated onto the roll face from the roll face to a greater extent than the blade itself brings onto the roll face and which doctor blade keeps the roll face in its original condition or restores it to its original condition.
The object of the present invention is a caring doctor blade for a paper/board machine, which blade removes undesirable coated material from the roll face and, at the same time, services the roll face, and a method for manufacture of such a blade.
The doctor blade in accordance with the present invention and the method for manufacture of same are characterized in what is stated in the patent claims.
By means of the solution that will be described in the following, the problems involved in the prior-art solutions are avoided and the objectives that have been set are achieved. In the solution in accordance with the invention, in the caring doctor blade, an abrasive blade and an almost optimal, carbon-fibre reinforced composite blade of reinforced plastic are combined. The caring doctor blade is not supposed to be exclusively abrasive, as the conventional abrasive blades are, but it is also supposed to have excellent doctoring and cleaning properties. Thus, in the caring doctor blade, the functions of two different blade types are combined. It is an essential feature of the properties of the caring blade that the structure of the blade is of a correct sort. The blade is a carbon-fibre/fibreglass composite, which contains a grinding material in a layer that contains fibreglass or carbon fibre. The content of carbon fibre in the composite is high, the content of the matrix material is low, and the fibre orientation is optimal.
The solution in accordance with the invention will be described in detail in Fig. 1 , in which a preferred solution in accordance with the present invention is illustrated by way of example.
The doctor blade as shown in Fig. 1 comprises a rigid laminate structure consisting of fibreglass and carbon fibre layers 2 and 3 and of at least one caring layer 1. The caring layer 1 is surrounded by fibreglass layers and possibly by carbon fibre layers. Besides carbon fibre, the carbon fibre layers 3 may also contain fibreglass. In the fibreglass layers 2, the fibreglass layers are orientated parallel to the longitudinal axis of the blade, and in at least some of the layers that contain carbon fibre, the carbon fibres are orientated substantially obliquely to the longitudinal axis of the doctor blade, preferably transversely to the blade direction. The topmost layers 4 are preferably mats with fibreglass surface.
The caring layer 1 comprises carbon fibres and grinding particles in direct vicinity of the carbon fibres, possibly additionally also glass fibres. As the grinding particles, it is possible to employ silicon carbide particles, diamond, boron nitride, aluminum oxide, or equivalent, the preferable one being silicon carbide. In the layer, there may be grinding particles across the entire width of the blade, but they can also be placed differently, for example at the edge of the blade that enters into contact with the roll. The grinding particles have been introduced into connection with the carbon fibres, for example, by impregnating into a carbon fibre fabric by means of a matrix material, which can be thermosetting or thermoplastic resin, and its basic matrix can be fluorinated.
In order that a suitable caring grinding effect could be obtained, the nature of the grinding agent (silicon carbide, diamonds, boron nitride, aluminium oxide, or equivalent; preferably silicon carbide) and the particle size (30 ... 250 μm; preferably 45 ... 125 μm) and the amount of particles on the wear face placed against the roll are chosen appropriately. The amount can be changed by adjusting the density of particles in the layer and/or by increasing the number of the layers that contain particles, for example 1...5 layers. The duration of the grinding effect can be regulated by fitting the particles on a certain distance within the wear margin only. In this way the grinding effect can be standardized in the cross direction of the whole roll even if the rate of wear of the blade in different areas were different. When expensive grinding materials are used, it is preferable to place the particles in the area of the wear margin only.
The thickness of the doctor blade is preferably about 1.3 ... 2.8 mm, while the thicknesses of the individual layers are of an order of about 0.1 ... 0.3 mm, the caring layer about 0.1 ... 0.4 mm. The doctor blade is manufactured preferably by means of a pultrusion method. In such a case, the grinding material is brought into connection with the carbon fibre fabric, for example impregnated into said fabric, before the pultrusion stage. Also, conventional methods known from the manufacture of sandwich constructions can be employed.
The higher the content of carbon fibre in the doctor blade of reinforced plastic is in relation to fibreglass and in particular in relation to matrix plastic, the slower is the covering of the roll face with plastic or the coating of the roll face at least in respect of the material separated from the blade. The case is also affected by how optimal the fibre orientation in the blade is and how good the resistance to heat of the matrix is. Favourable matrix materials are thermosetting or thermoplastic resins that endure a temperature higher than 200°C. Longitudinal glass fibres and possible carbon fibres give the structure the necessary robustness and rigidity in the longitudinal direction.
From the point of view of the operability of the blade, it is important that the grinding, hard particles, for example silicon carbide, are surrounded by carbon fibre. The function of the carbon fibre is to conduct the arising friction heat away from the grinding particles so that the matrix material around the particles of grinding material does not burn or melt, with resulting removal of the grinding particles. A substantially cross-direction orientation of the carbon fibres provides good conductivity of heat away from the tip of the blade, i.e. away from the matrix which constitutes the fixing agent for the grinding material and from the particles of grinding material, in which case the melting of the matrix is reduced. Further, the rigidity of the blade in the cross direction is high, which improves the doctoring result. The blade is, however, resilient in the longitudinal direction of the blade, in which case the blade follows the roll face and complies with the roll face well over the entire length of the blade. Such a doctor blade operates excellently as a shearing blade, in addition to the abrading effect; a conventional abrasive blade cannot cut off the impurities. Thus, by means of a single blade, a multiple effect is obtained, which provides evident advantages also in a case in which, on the rolls, both a grinding blade and a shearing blade can be used separately in a doctor.

Claims

Claims
1. A doctor blade for a paper/board machine, which blade comprises a number of fibrous layers as a laminated structure, characterized in that the structure comprises at least one layer made of carbon fibre or substantially containing carbon fibre, which layer contains grinding particles in direct vicinity of the carbon fibres and in which layer the orientation of the carbon fibres is substantially diverging from the direction of the longitudinal axis of the blade, preferably in the cross direction of the blade.
2. A doctor blade as claimed in claim 1 , characterized in that the grinding material is silicon carbide, diamond, boron nitride, aluminum oxide, or equivalent, and its particle size is 30 ... 250 μm, preferably 45 ... 125 μm.
3. A doctor blade as claimed in claim 1 or 2, characterized in that the grinding particles are impregnated into a fabric of carbon fibre by means of a matrix material, which can be a thermosetting or thermoplastic resin and possibly fluorinated.
4. A doctor blade as claimed in claim 1 , characterized in that the grinding particles are placed at the edge that enters into contact with the roll, preferably in the area of the wear margin of the blade only or in a part of said area only.
5. A doctor blade as claimed in claim 1 , characterized in that the layer of carbon fibre that contains grinding particles has been surrounded with layers of fibreglass and carbon fibre, in which layers the directions of orientation of the glass fibres are substantially parallel to the longitudinal axis of the blade, and in which layers the directions of orientation of the carbon fibres are substantially diverging from the direction of the longitudinal axis of the blade.
6. A method for manufacture of a doctor blade for a paper/board machine, characterized in that the blade is manufactured by means of a pultrusion method, in which the grinding particles are affixed, for example, by impregnating by means of a matrix material, to the fibre fabric before the pultrusion stage.
y AMENDED CLAIMS
[received by the International Bureau on 16 February 1999 (16.02.99); original claims 1-6 replaced by amended claims 1-6 (2 pages)]
1. A doctor blade for a paper/board machine, which blade comprises a number of fibrous layers as a laminated structure, characterized in that the structure comprises at least one layer made of carbon fibre or substantially containing carbon fibre, which layer contains grinding particles in direct vicinity of the carbon fibres and in which layer the orientation of the carbon fibres is substantially diverging from the direction of the longitudinal axis of the blade, preferably in the cross direction of the blade.
2. A doctor blade as claimed in claim 1. characterized in that the grinding material is silicon carbide, diamond, boron nitride, aluminum oxide, or equivalent, and its particle size is 30 ... 250 μm, preferably 45 ... 125 μm.
3. A doctor blade as claimed in claim 1 or 2. characterized in that the grinding particles are impregnated into a fabric of carbon fibre by means of a matrix material, which can be a thermosetting or thermoplastic resin and possibly fluorinated.
4. A doctor blade as claimed in claim 1. characterized in that the grinding particles are placed at the edge that enters into contact with the roll, preferably in the area of the wear margin of the blade only or in a part of said area only.
5. A doctor blade as claimed in claim 1 , characterized in that the layer of carbon fibre that contains grinding particles has been surrounded with layers of fibreglass and carbon fibre, in which layers the directions of orientation of the glass fibres are substantially parallel to the longitudinal axis of the blade, and in which layers the directions of orientation of the carbon fibres are substantially diverging from the direction of the longitudinal axis of the blade.
6. A method for manufacture of a doctor blade for a paper/board machine, characterized in that the blade is manufactured by means of a pultrusion method, in which the grinding particles are affixed, for example, by impregnating by means of a matrix material, to the fibre fabric before the pultrusion stage.
PCT/FI1998/000690 1997-09-08 1998-09-04 Caring doctor blade and method for manufacture of same WO1999012726A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE69804427T DE69804427T2 (en) 1997-09-11 1998-09-04 SCRAPER BLADE AND METHOD FOR THE PRODUCTION THEREOF
CA002270770A CA2270770C (en) 1997-09-11 1998-09-04 Caring doctor blade and method for manufacture of same
US09/297,627 US6416843B1 (en) 1997-09-11 1998-09-04 Caring doctor blade and method for manufacture of same
AT98942708T ATE215012T1 (en) 1997-09-11 1998-09-04 SPRAYER BLADE AND METHOD FOR PRODUCING SAME
EP98942708A EP0944470B1 (en) 1997-09-11 1998-09-04 Caring doctor blade and method for manufacture of same
AU90740/98A AU9074098A (en) 1997-09-11 1998-09-04 Caring doctor blade and method for manufacture of same
NO20001206A NO319535B1 (en) 1997-09-08 2000-03-08 Method and apparatus for controlling a pneumatic cargo paving device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI973659 1997-09-11
FI973659A FI101637B (en) 1997-09-11 1997-09-11 Caring creation work and procedure for making this

Publications (1)

Publication Number Publication Date
WO1999012726A1 true WO1999012726A1 (en) 1999-03-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1998/000690 WO1999012726A1 (en) 1997-09-08 1998-09-04 Caring doctor blade and method for manufacture of same

Country Status (8)

Country Link
US (2) US6416843B1 (en)
EP (1) EP0944470B1 (en)
AT (1) ATE215012T1 (en)
AU (1) AU9074098A (en)
CA (1) CA2270770C (en)
DE (1) DE69804427T2 (en)
FI (1) FI101637B (en)
WO (1) WO1999012726A1 (en)

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EP1123751A1 (en) * 2000-02-08 2001-08-16 Metso Paper, Inc.(Reg.No. 763281) Composite blade and a method for its manufacture
WO2002092340A1 (en) * 2001-05-17 2002-11-21 Lingol Corporation Composite
WO2003060231A1 (en) * 2002-01-11 2003-07-24 S.D. Warren Services Company Composite doctor blades
US6643890B2 (en) 2000-12-01 2003-11-11 S. D. Warren Services Company Composite doctor blades
US6687950B1 (en) 1998-06-09 2004-02-10 Metso Paper, Inc. Doctor blade and blade holder comprising composite material and ceramic coating
US6758944B2 (en) 1998-09-10 2004-07-06 Metso Paper, Inc. Doctor blade
WO2007030392A1 (en) * 2005-09-08 2007-03-15 Kadant Web Systems, Inc. Planar elements incorporating basalt fibers for use in papermaking apparatus
WO2007036606A1 (en) 2005-09-28 2007-04-05 Ike-Service Oy Blade, structural components op a blade, and method for manufacturing a blade and the structural components of a blade
WO2007065974A1 (en) * 2005-12-07 2007-06-14 Exel Oyj Doctor blade for the roll of a paper or board machine and method for manufacturing the doctor blade
WO2010146227A1 (en) * 2009-06-18 2010-12-23 Exel Composites Oyj Doctor blade material
WO2014018524A1 (en) * 2012-07-23 2014-01-30 Kadant Inc. Doctor blade including combination carbon / glass yarns
EP2726278A1 (en) * 2011-06-28 2014-05-07 Exel Composites OYJ Doctor blade material

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DE20216016U1 (en) * 2002-10-18 2004-03-04 Rk Siebdrucktechnik Gmbh Squeegees, especially for screen printing
DE102004004500A1 (en) * 2004-01-23 2005-08-11 Joh. Clouth Gmbh & Co. Kg Blade for a scraper and method of making such a blade
FI116797B (en) * 2004-03-25 2006-02-28 Runtech Systems Oy spring Scraper
FI1776503T4 (en) * 2004-06-14 2023-08-31 Planar elements for use in papermaking machines
DE102005002640A1 (en) 2005-01-20 2006-07-27 Voith Paper Patent Gmbh doctor means
US7431801B2 (en) * 2005-01-27 2008-10-07 The Procter & Gamble Company Creping blade
US7691236B2 (en) * 2006-07-26 2010-04-06 The Procter + Gamble Company Creping blade with a highly smooth bevel surface
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AU9074098A (en) 1999-03-29
CA2270770A1 (en) 1999-03-18
FI101637B1 (en) 1998-07-31
US6416843B1 (en) 2002-07-09
CA2270770C (en) 2006-01-24
DE69804427D1 (en) 2002-05-02
DE69804427T2 (en) 2002-08-08
EP0944470A1 (en) 1999-09-29
EP0944470B1 (en) 2002-03-27
US6991757B2 (en) 2006-01-31
FI101637B (en) 1998-07-31
FI973659A0 (en) 1997-09-11
ATE215012T1 (en) 2002-04-15
US20020176934A1 (en) 2002-11-28

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