WO2006134207A1 - Method and apparatus for making a wear-resistant coating on a coating blade or equivalent - Google Patents

Method and apparatus for making a wear-resistant coating on a coating blade or equivalent Download PDF

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Publication number
WO2006134207A1
WO2006134207A1 PCT/FI2006/000195 FI2006000195W WO2006134207A1 WO 2006134207 A1 WO2006134207 A1 WO 2006134207A1 FI 2006000195 W FI2006000195 W FI 2006000195W WO 2006134207 A1 WO2006134207 A1 WO 2006134207A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
blade
coated
treatment
pvd
Prior art date
Application number
PCT/FI2006/000195
Other languages
French (fr)
Inventor
Ingmar Vesterlund
Original Assignee
Ingmar Westerlund Consulting Oy
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 Ingmar Westerlund Consulting Oy filed Critical Ingmar Westerlund Consulting Oy
Publication of WO2006134207A1 publication Critical patent/WO2006134207A1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B05D1/42—Distributing applied liquids or other fluent materials by members moving relatively to surface by non-rotary members
    • 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
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26—Deposition of carbon only
    • C23C16/27—Diamond only
    • 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
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters

Definitions

  • the present invention relates to a method for making a wear-resistant, diamond- like coating on a treatment blade, such as a coating blade or doctor blade or equivalent, intended for the treatment of a paper web.
  • the invention also relates to an apparatus for making such a wear-resistant coating on a blade.
  • the paper is generally coated with a paste-like additive containing e.g. a pigment and binding agents.
  • the aim of coating is to improve the properties of the paper surface.
  • the coating is performed in the coating unit of the paper machine, where a coating material is applied to the surface of the raw paper and smoothed out.
  • the coating may be performed e.g. in a trailing blade coater, where the coating material is applied to the paper surface and smoothed by means of a coating roll and coating blades arranged in conjunction with it. The coating blade edge facing towards the paper web is beveled.
  • the edge of the coating blade facing towards the paper web is coated with a wear-resistant material, such as a ceramic or hard-metal material (e.g. TiO2 or WC-Co).
  • a wear-resistant material such as a ceramic or hard-metal material (e.g. TiO2 or WC-Co).
  • Machine parts can also be protected with coatings other than thermal sprayed coatings.
  • Wear-resistant parts are also often coated using thin-film technology.
  • the coating is often carried out in PVD (Physical Vapour Deposition) reactors, where the coating temperature is low enough to ensure that the hardened steel often used as base material will not soften ⁇ 300 C.
  • the hardness of the steel strip is > HV 500.
  • the object of the present invention is to eliminate the drawbacks of prior art and to achieve a new type of diamond-like coating (DLC), a method and an apparatus (PVD, Physical Vapour Deposition) for making a wear-resistant coating on the edge of a coating blade or equivalent.
  • DLC diamond-like coating
  • PVD Physical Vapour Deposition
  • An embodiment of the method of the invention is based on the idea that, since wear of coating blades only occurs at the edge of the blade, it will suffice to coat the blade in its edge area of 2-12 mm.
  • the coating of the blade can be implemented by wrapping the blade in spiral around a drum, so that only the blade portion to be coated remains exposed to view.
  • Fig. 1 presents a coating blade produced by an apparatus according to the invention, fitted in conjunction with a coating roll,
  • Fig. 2 illustrates blade coating according to the invention.
  • Fig. 1 presents a coating device designed for the coating of paper, wherein a coating agent 1 is applied to the surface of a paper web 2 running between rolls and smoothed by means of a coating roll 3 rotated in the direction indicated by the arrow and a coating blade 4 arranged in conjunction with it.
  • the coating blade edge 41 facing towards the paper web 2 is beveled.
  • the edge 41 of the coating blade facing towards the paper web is coated with a coating 42 resistant to wear in the direction of web motion.
  • Fig. 2 By winding the blade 4 in spiral around a conical drum DRUM1 , it is possible to place a strip of flexible blade material even hundreds of meters long in a small coating reactor (chamber) REACTOR1. As wear of coating blades only oc- curs at the edge of the blade, it suffices to coat the blade in an area of only 2-12 mm at its edge. As the coating of the blade can be implemented by winding the blade in spiral around the drum, only the blade portion to be coated is exposed. By winding the blade in a coil as described above, it is possible to solve the prob- lem of coating the edge of a long object.
  • Blades used at present are hardened and coated with ceramics or hard metal to increase the service life (e.g. WC-CoCr or TiO2).
  • the reduction of blade wear is based on the hardness of the coating.
  • the hardness of the coatings and harden- ing varies in the range of HV 700-1500.
  • Harder than the above- mentioned coatings are diamond or diamond-like carbon coatings (DLC).
  • Diamond-like coatings are used because diamond is the hardest material known, having a hardness value of about HV 10000 on Vickers scale. By using diamond, the durability of the blade can be significantly improved. By increasing the durability of the blade, the interval between blade changes in the paper machine can be considerably increased.
  • the coating is formed as a film of a thickness of 1-20 ⁇ m on the edge of a pre-ground blade.
  • Fig. 2 presents a schematic illustration of the position of the coating on the pre-ground blade.
  • the method of the invention for forming a coating on a coating and doctor blade designed for the treatment of a paper web and a roll surface works as follows:
  • the blade manufacturing method is characterized in that the blade is coated under a negative pressure of ⁇ 0.1 bar by the PVD method by forming a dia- mond-like coating on a steel strip.
  • the steel strip is wound in spiral in a coating chamber either freely or around a cylinder.
  • the length of the strip thus coiled may be 3-1000 m.
  • the area to be coated is 2-12 mm wide on the exposed outer surface of the coiled strip - if necessary, the coating is made on a pre-ground edge having a width of 0.1- 3 mm,
  • the angle of the pre-ground edge may be 0-60°
  • the coating consists of a diamond-like coating (DLC).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Coating Apparatus (AREA)

Abstract

A method for making a wear-resistant coating on a treatment blade (4), such as a coating or doctor blade, designed for the treatment of a paper web, in a treatment space, in which method the area to be coated is located at the edge of the blade, in which the treatment blade is coated with a diamond-like coating (DLC) by the PVD (PVD = Physical Vapour Deposition) method.

Description

METHOD AND APPARATUS FOR MAKING A WEAR-RESISTANT COATING ON A COATING BLADE OR EQUIVALENT
The present invention relates to a method for making a wear-resistant, diamond- like coating on a treatment blade, such as a coating blade or doctor blade or equivalent, intended for the treatment of a paper web.
The invention also relates to an apparatus for making such a wear-resistant coating on a blade.
In the coating of paper, the paper is generally coated with a paste-like additive containing e.g. a pigment and binding agents. The aim of coating is to improve the properties of the paper surface. The coating is performed in the coating unit of the paper machine, where a coating material is applied to the surface of the raw paper and smoothed out. The coating may be performed e.g. in a trailing blade coater, where the coating material is applied to the paper surface and smoothed by means of a coating roll and coating blades arranged in conjunction with it. The coating blade edge facing towards the paper web is beveled.
To increase the wear resistance of coating blades, the edge of the coating blade facing towards the paper web is coated with a wear-resistant material, such as a ceramic or hard-metal material (e.g. TiO2 or WC-Co). With a coated blade, a longer service life is achieved, leading to fewer blade changes, less waste paper, more paper for the same machine time and a better paper quality.
Machine parts can also be protected with coatings other than thermal sprayed coatings. Wear-resistant parts are also often coated using thin-film technology. The coating is often carried out in PVD (Physical Vapour Deposition) reactors, where the coating temperature is low enough to ensure that the hardened steel often used as base material will not soften <300 C. The hardness of the steel strip is > HV 500.
However, the coating of coating blades is subject to a restriction due to the large size 2000-12000 mm of the blades. However, the blades are thin, typically 0.4 *80 mm, and therefore flexible. Blades of this length can not be fitted in the coating devices, whose vacuum chamber often has a diameter below 1000 mm. The object of the present invention is to eliminate the drawbacks of prior art and to achieve a new type of diamond-like coating (DLC), a method and an apparatus (PVD, Physical Vapour Deposition) for making a wear-resistant coating on the edge of a coating blade or equivalent.
An embodiment of the method of the invention is based on the idea that, since wear of coating blades only occurs at the edge of the blade, it will suffice to coat the blade in its edge area of 2-12 mm. Thus, the coating of the blade can be implemented by wrapping the blade in spiral around a drum, so that only the blade portion to be coated remains exposed to view.
The features characteristic of the method and apparatus of the invention are set forth in detail in the claims below.
The advantages achieved as compared to earlier blade manufacturing methods: Even long blades can be coated with a DLC in PVD reactors. In addition, the coating arrangement of the invention is simple and economical.
In the following, the invention will be described in detail by referring to an exam- pie and the attached drawings, wherein
Fig. 1 presents a coating blade produced by an apparatus according to the invention, fitted in conjunction with a coating roll,
Fig. 2 illustrates blade coating according to the invention.
Fig. 1 presents a coating device designed for the coating of paper, wherein a coating agent 1 is applied to the surface of a paper web 2 running between rolls and smoothed by means of a coating roll 3 rotated in the direction indicated by the arrow and a coating blade 4 arranged in conjunction with it. The coating blade edge 41 facing towards the paper web 2 is beveled. To increase the wear resistance of the coating blades, the edge 41 of the coating blade facing towards the paper web is coated with a coating 42 resistant to wear in the direction of web motion.
Fig. 2. By winding the blade 4 in spiral around a conical drum DRUM1 , it is possible to place a strip of flexible blade material even hundreds of meters long in a small coating reactor (chamber) REACTOR1. As wear of coating blades only oc- curs at the edge of the blade, it suffices to coat the blade in an area of only 2-12 mm at its edge. As the coating of the blade can be implemented by winding the blade in spiral around the drum, only the blade portion to be coated is exposed. By winding the blade in a coil as described above, it is possible to solve the prob- lem of coating the edge of a long object.
Blades used at present are hardened and coated with ceramics or hard metal to increase the service life (e.g. WC-CoCr or TiO2). The reduction of blade wear is based on the hardness of the coating. The hardness of the coatings and harden- ing varies in the range of HV 700-1500. By increasing the hardness of the coating, it is possible to extend the service life of the blade. Harder than the above- mentioned coatings are diamond or diamond-like carbon coatings (DLC). Diamond-like coatings are used because diamond is the hardest material known, having a hardness value of about HV 10000 on Vickers scale. By using diamond, the durability of the blade can be significantly improved. By increasing the durability of the blade, the interval between blade changes in the paper machine can be considerably increased. The coating is formed as a film of a thickness of 1-20 μm on the edge of a pre-ground blade. Fig. 2 presents a schematic illustration of the position of the coating on the pre-ground blade.
The method of the invention for forming a coating on a coating and doctor blade designed for the treatment of a paper web and a roll surface works as follows:
- the blade manufacturing method is characterized in that the blade is coated under a negative pressure of <0.1 bar by the PVD method by forming a dia- mond-like coating on a steel strip.
- the steel strip is wound in spiral in a coating chamber either freely or around a cylinder. The length of the strip thus coiled may be 3-1000 m.
- the area to be coated is 2-12 mm wide on the exposed outer surface of the coiled strip - if necessary, the coating is made on a pre-ground edge having a width of 0.1- 3 mm,
- the angle of the pre-ground edge may be 0-60°
- the coating consists of a diamond-like coating (DLC).

Claims

1. Method for making a wear-resistant coating on a treatment blade (4), such as a coating or doctor blade, designed for the treatment of a paper web, in a treat- ment space, in which method the area to be coated is located at the edge of the blade, characterized in that the treatment blade is coated with a diamond-like coating (DLC) by the PVD (PVD = Physical Vapour Deposition) method.
2. Method according to claim 1 , characterized in that a steel strip is wound in spiral in a coating reactor chamber (CHAMBER1) either in free space or around a cylindrical part (DRUM1 ).
3. Method according to claim 1 , characterized in that the area to be coated is within a 2-12 mm area on the exposed outer surface of the coiled strip.
4. Method according to claim 1 , characterized in that the coating is made on a pre-ground edge.
5. Method according to claim 1 , characterized in that the angle of the pre-ground edge is 0-60°.
6. Apparatus for making a wear-resistant coating on a treatment blade (4), such as a coating or doctor blade, designed for the treatment of a paper web, in a treatment space, in which method the area to be coated is located at the edge of the blade, characterized in that the apparatus contains a PVD (PVD = Physical Vapour Deposition) reactor (REACTOR1), where the treatment blade is coated by the PVD (PVD = Physical Vapour Deposition) method with a diamond-like coating (DLC).
7. Apparatus according to claim 6, characterized in that the apparatus contains a cylinder or equivalent (DRUM1), a steel strip being wound in spiral around the cylindrical part (DRUM1 ) in the coating chamber.
8. Apparatus according to claim 6, characterized in that the area to be coated is on the exposed outer surface of the coiled strip within an area of 2-12 mm.
9. Apparatus according to claim 6, characterized in that the cylindrical part (DRUM1) is conical.
PCT/FI2006/000195 2005-06-14 2006-06-14 Method and apparatus for making a wear-resistant coating on a coating blade or equivalent WO2006134207A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20050628A FI123788B (en) 2005-06-14 2005-06-14 Method and equipment for making a wear resistant coating on a coating sheet or equivalent
FI20050628 2005-06-14

Publications (1)

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WO2006134207A1 true WO2006134207A1 (en) 2006-12-21

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WO (1) WO2006134207A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448352A (en) * 2007-04-12 2008-10-15 Dek Int Gmbh Wiper blade for a screen printing machine
DE202009000562U1 (en) 2009-01-17 2009-03-12 Voith Patent Gmbh doctor blade

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3272175A (en) * 1965-05-12 1966-09-13 Heraeus Gmbh W C Vapor deposition means for strip-coating continuously moving, helically wound ribbon
US3784458A (en) * 1973-04-03 1974-01-08 Warner Lambert Co Method of coating a continuous strip of ribbon razor blade material
WO1999054520A1 (en) * 1998-04-22 1999-10-28 Valmet Corporation Parts of a paper/board or finishing machine that are subjected to intensive wear and method for manufacture of such parts
WO2001000402A1 (en) * 1999-06-24 2001-01-04 Henrik Ljungcrantz Wear resistant surface and a method for its manufacturing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3272175A (en) * 1965-05-12 1966-09-13 Heraeus Gmbh W C Vapor deposition means for strip-coating continuously moving, helically wound ribbon
US3784458A (en) * 1973-04-03 1974-01-08 Warner Lambert Co Method of coating a continuous strip of ribbon razor blade material
WO1999054520A1 (en) * 1998-04-22 1999-10-28 Valmet Corporation Parts of a paper/board or finishing machine that are subjected to intensive wear and method for manufacture of such parts
WO2001000402A1 (en) * 1999-06-24 2001-01-04 Henrik Ljungcrantz Wear resistant surface and a method for its manufacturing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448352A (en) * 2007-04-12 2008-10-15 Dek Int Gmbh Wiper blade for a screen printing machine
DE202009000562U1 (en) 2009-01-17 2009-03-12 Voith Patent Gmbh doctor blade

Also Published As

Publication number Publication date
FI20050628A (en) 2006-12-15
FI123788B (en) 2013-10-31
FI20050628A0 (en) 2005-06-14

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