EP2510152A1 - Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine - Google Patents

Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine

Info

Publication number
EP2510152A1
EP2510152A1 EP10835547A EP10835547A EP2510152A1 EP 2510152 A1 EP2510152 A1 EP 2510152A1 EP 10835547 A EP10835547 A EP 10835547A EP 10835547 A EP10835547 A EP 10835547A EP 2510152 A1 EP2510152 A1 EP 2510152A1
Authority
EP
European Patent Office
Prior art keywords
blade
doctor
doctor blade
section
fiber web
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.)
Granted
Application number
EP10835547A
Other languages
German (de)
French (fr)
Other versions
EP2510152B1 (en
EP2510152A4 (en
Inventor
Reijo Hassinen
Harri Ruotsalainen
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper 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
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Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP2510152A1 publication Critical patent/EP2510152A1/en
Publication of EP2510152A4 publication Critical patent/EP2510152A4/en
Application granted granted Critical
Publication of EP2510152B1 publication Critical patent/EP2510152B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • B05C1/08—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 using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—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 using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • 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
    • B05C11/04—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 with blades
    • B05C11/041—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 with blades characterised by means for positioning, loading, or deforming the blades
    • 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
    • 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
    • B05C11/04—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 with blades
    • B05C11/044—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 with blades characterised by means for holding the blades
    • 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
    • B05C11/04—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 with blades
    • B05C11/045—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 with blades characterised by the blades themselves

Definitions

  • the invention relates to a doctor blade for a fiber web ma- chine, the doctor blade including a blade section and a fastening detent section.
  • the invention also relates to a doctor arrangement in a fiber web machine.
  • doctor blades are used in a fiber web machine mainly for keeping the roll surfaces clean. Doctor blades can also be used for dewatering, for example, at a suction roll.
  • the blade section is composed of a plate-like component having one of its edges chamfered and the edge opposite to the chamfer arranged as a fastening detent. Rivets are used in thin doctor blades, and particularly in thick doctor blades, the fastening detent can be formed in the basic material of the doctor blade. The fastening detent section ensures that the doctor blade keeps in place in the blade holder. Doctor blades are usually made of metal, plastic, fiber-reinforced plastic, or a plastic composition. Some known doctor blades are proposed in Finnish patent application No. 20065601.
  • doctor blades have a number of shortcomings. Firstly, several positions require a certain kind of doctor blade, which increases the number of different doctor blades in a fiber web machine. Moreover, blade holders may set additional requirements for doctor blades. For doctoring of particularly soft-surfaced rolls or belts, plastic blades are used which bend disadvantageously and the blade section of which becomes easily swaged. Plastic blades also bend easily during storage. Adaptation of a bent doctor blade to the roll surface is incomplete, which causes, for example, unevenness in the contact profile or an otherwise incomplete doctoring result. Disturbances in doctoring cause web breaks and local surface pressure variations shorten the fabric life. It is an object of the invention to provide a novel doctor blade for a fiber web machine with more versatile functions than before.
  • Another object of the invention is to provide a novel doctor arrangement in a fiber web machine which arrange- ment can be adapted in many positions.
  • the characteristic features of the doctor blade according to this invention are that in the cross-sectional plane the blade section is asymmetric while the fastening detent section is substantially symmetric so that the doctor blade can be installed in two opposite positions for providing two different functions. Due to the asymmetry of the blade section, the doctor blade is provided with two kinds of property, which diversifies the use of the doctor blade. In other words, one kind of a doctor blade can be used for two different purposes simply by changing the position of the doctor blade.
  • the characteristic features of the doctor arrangement according to the invention are that in the cross-sectional plane the blade section is asymmetric while the fastening detent section is substantially symmetric so that the doctor blade can be installed in the blade holder by its fastening detent section in two opposite positions for providing two different functions.
  • a symmetric fastening detent section enables to install the doctor blade in the blade holder in both directions.
  • the doctor blade according to the invention can be installed in most positions in which case a fiber web machine requires fewer different doctor blades compared to heretofore.
  • Figure 1 shows two doctor arrangements according to the in- vention adapted to the vicinity of a surface to be doctored
  • Figure 2a is an end view of a first application example of the doctor blade according to the invention
  • Figure 2b is an end view of a second application example of the doctor blade according to the invention.
  • Figure 3 is an axonometric cross-sectional view of the application example of Figure 2a
  • Figure 4 shows a modification of the doctor arrangement according to the invention.
  • Figure 1 shows two doctor arrangements according to the invention for a fiber web machine.
  • the doctor blade included in the doctor arrangement is meant particularly for removing water and fine matter from the surface to be doctored.
  • the doctor arrangement according to the invention is suitable for doctoring coated rolls, belts and transfer belts as well as open-surfaced rolls.
  • open-surfaced rolls are used for several different reasons.
  • the shell is perforated for leading a vacuum effect from the inside of the roll to the outside of it.
  • the holes make the shell open-surfaced.
  • grooved rolls are also used, in which the shell surface is grooved mainly for improving dewatering.
  • a suction roll with a grooved surface also exists, the shell of which is provided with both holes and grooves.
  • blind bores for example, can be used.
  • Soft coatings are also used in the rolls while belts and transfer belts are soft-surfaced by their nature.
  • the surface of a belt for example, can be grooved.
  • the doctor blade 10 includes a blade section 11 and a fastening detent section 12 ( Figures 2a and 2b) . In both embodiments shown in Figure 1, the blade section 11 is adapted to a light contact with the surface 14 of the roll 13.
  • the doctor blade 10 can be loaded, for example, with the blade holder 15 proposed, which includes a fastening plate 16 and a holder 17.
  • the fastening plate 16 is supported to the construe- tions of the fiber web machine and a loading hose 18 is provided between the fastening plate 16 and the holder 17.
  • the doctor blade is loaded by pressurizing the loading hose.
  • the doctor blade can be detached from the surface to be doctored by leading a vacuum to the loading hose for a doctor blade replacement, for example.
  • This blade holder design also includes a presser blade 19 with which the supporting and loading effect of the holder 17 can be extended sufficiently far.
  • the characteristics of the blade holder can be varied by changing the presser blade.
  • the profiled lower clamp 20 of the holder 17 together with the presser blade 19 form a gap to which the fastening detent section of the doctor blade 10 is adapted. This ensures that the doctor blade keeps in place in the blade holder while allowing at the same time easy and fast doctor blade replacement.
  • the blade section is asymmetric in the cross-sectional plane while the fastening detent section is substantially symmetric so that the doctor blade can be installed in two opposite positions for providing two different functions. Due to the asymmetric design, the doctor blade is surprisingly provided with two functionalities of which the one that suits the position concerned is selected in each specific case.
  • the doctor blade is turned in such a way that the surface being the bottom surface of the blade section in one application, is the top surface in the second application and vice versa.
  • the one and the same side of the doctor blade is in the gap in both applications.
  • the doctor blade is turned around about the center axis located in its width direction. According to Figure 2a, this center axis is parallel to the axis of symmetry of the fastening detent section 12.
  • the axis of symmetry is illustrated with a dot-and-dash line in Figures 2a and 2b.
  • the doctor arrangement located in the upper position of Figure 1 corresponds to the first function according to the invention, this function being a doctoring blade.
  • the tip 21 of the blade section 11 of the doctor blade 10 contacts the surface 14 to be doctored and removes water and impurities.
  • the doctoring blade has a chamfered tip 22 for providing a contact surface.
  • the length of the chamfered tip naturally depends on the dimensioning of the doctor blade. Generally, the length of the chamfered tip is 10 - 20% of the width of the doctor blade.
  • the angle of the chamfered tip is so dimensioned that the chamfered tip can be adapted substantially according to the surface to be doctored. With such a doctor blade, a good doctoring result is achieved even with a small blade load. Furthermore, wearing of the doctor blade is reduced, and above all, the risk of damaging a soft surface is low .
  • the doctor arrangement located in the lower position of Figure 1 corresponds to the second function according to the invention, this function being a foil blade.
  • the foil blade too, partly doctors the surface 14 with the tip 21; however, it is essential that a narrow gap is formed between the surface 14 and the doctor blade 10 in which gap a vacuum is created due to the mutual movement of the surface 14 and the doctor blade 10.
  • This vacuum absorbs water and fine matter from the open surface, which is advantageous for the operation of the fiber web machine.
  • Known foil blades are thick and require a holder of the kind completely of their own. Regardless of the application, the doctor blade according to the invention can be used for a blade holder of one kind.
  • the dimensioning of the bulge depends greatly on the dimensioning of the doctor blade.
  • the effective length of the flow surface is about half of the width of the doctor blade.
  • the effective length t of the flow surface 23 is 30 - 60 mm, more advantageously 40 - 55 mm.
  • the effective length is also influ- enced by the rest of the design of the doctor blade.
  • the bulge 24 forms a wedge-shaped blade section 11, whose angle a between the outer surfaces 25 and 26 is 10 - 30°, more advantageously 15 - 20° ( Figure 2a).
  • this angle grows, the effective length shortens. However, this shortening can be compensated by the design of the doctor blade.
  • the doctor blade 10 of Figure 2a is dimensioned with consideration to known blade holders.
  • the width of the doctor blade is in a class of 100 mm, but narrower or wider ones than this can also be manufactured.
  • the minimum thickness of the doctor blade is approximately 2.5 mm in which case it suits known blade holders.
  • the thinned part forms a neck 28 which is symmetric together with shoulders 29.
  • the width of the thin area is approxi- mately 25 mm, after which the thickness of the doctor blade increases at least to four millimeters. With this thickening, harmful bending of the doctor blade is avoided.
  • the blade arrangement according to the invention has new features.
  • the blade section is thus asymmetric in the cross-sectional plane while the fastening detent section is substantially symmetric so that the doctor blade can be installed by its fastening detent section in two opposite positions for providing two different functions.
  • the doctor blade 10 has mainly a doctoring function and it is so adapted that the angle ⁇ between the doctor blade 10 and the surface 13 to be doctored is 6 - 16°, more advantageously 10 - 14° ( Figure 1) . Then the blade angle formed is advantageously small, whereby it is avoided that the doctor blade bites the soft surface. The biting tendency is also reduced by the above mentioned chamfered tip.
  • the foil blade is so adapted that the angle ⁇ between the doctor blade 10 and the surface 13 to be doctored is 1 - 10°, more advantageously 4 - 6° ( Figure 1) .
  • the slightly growing gap forms an efficient vacuum effect.
  • a space is formed for water between the flow surface and the surface.
  • the doctor arrangement is placed so that water can drop down by gravity after the flow surface. Suction rolls, for example, are provided with collecting pans of their own, while from grooved rolls, water flows to the pans of the press and further to the sewerage. Detached water can also be doctored with another doctor blade according to the invention.
  • a doctor blade according to the invention is advantageously made of a plastic material so that the doctor blade can be used for doctoring soft roll surfaces, belts and transfer belts.
  • plastic materials There are several possible plastic materials but advantageously HD or LD polyethylene or polypropylene is used.
  • the raw material of the final product has a high molecular weight and selected alloying additives are used in the manufacture. Specifically, by maximizing the polymerization degree and saturating the raw material with dry grease material and finally by sinter-pressing, a wear resistant and rigid final product is achieved, which is additionally stress-free and stable in form.
  • a doctor blade according to the invention can be manufactured by machining. The production method also enables to manufacture long pieces. Thus the completed doctor blade is seamless.
  • the doctor blade includes an integral fastening detent section, separate rivetings are unnecessary .
  • Figure 2b shows the second embodiment of the doctor blade 10 according to the invention.
  • the bulge 24 is formed with a wing 27.
  • the partly open construction reduces the amount of raw material and the design is also suitable for manufacturing by pultrusion. Pultrusion also enables to manufacture a hollow bulge (not shown) .
  • the doctor blade can be manufactured by combining several pieces. For example, a key-like component can be fastened to a wedge-shaped blade blank as a bulge.
  • Figure 4 shows a modification of the doctor arrangement according to the invention. Here the universal applicability of the doctor blade 10 is illustrated using two different blade holders 15.
  • FIG. 4 shows a so called DST blade holder on the left-hand ⁇ side provided with two loading hoses 18.
  • the functional presser blade 19 is composed of an upper plate fastened to the holder 17.
  • Figure 4 shows a so called K35 blade holder on the right-hand side which is rigid and has been fastened to the doctor beam provided with loading elements (not shown) .
  • the functional presser blade 19 is composed of the fastening plate 16 of the holder.
  • the doctor blade according to the invention also suits other types of blade holders, such as the applicant's own FiberDoc blade holder, for example.
  • Blade holders can also be provided with a presser blade.
  • the blade holder can be made of a composite or a metal material.
  • the doctor blade according to the invention is so universal in design that it can be adapted to almost all known blade holders. Moreover, the surprising dual function covers most doctoring positions and requirements. By simply turning the doctor blade, either a doctoring blade or a foil blade is provided. In case the position allows it, a doctor blade that has been used in a doctoring application can be adapted as a foil blade when worn. On the other hand, applicable surface pressures are low and the blade material is wear-resistant so that the doctor blade remains operational for a long time. With the blade according to the invention it is possible to remarkably reduce the number of different doctor blades in a fiber web machine. Moreover, a novel doctor blade can be taken into use without major equipment changes or investments.

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  • Paper (AREA)

Abstract

The invention relates to a doctor blade for a fiber web machine. The doctor blade (10) includes a blade section (11) and a fastening detent sect ion (12). In the cross-sectional plane, the blade section (11) is asymmetric while the fastening detent section (12) is substantially symmetric so that the doctor blade (10) can be installed in two opposite positions for providing two different functions. The invention also relates to a doctor arrangement in a fiber web machine.

Description

DOCTOR BLADE FOR A FIBER WEB MACHINE AND DOCTOR ARRANGEMENT IN A FIBER WEB MACHINE
The invention relates to a doctor blade for a fiber web ma- chine, the doctor blade including a blade section and a fastening detent section. The invention also relates to a doctor arrangement in a fiber web machine.
Various doctor blades are used in a fiber web machine mainly for keeping the roll surfaces clean. Doctor blades can also be used for dewatering, for example, at a suction roll. Conventionally, the blade section is composed of a plate-like component having one of its edges chamfered and the edge opposite to the chamfer arranged as a fastening detent. Rivets are used in thin doctor blades, and particularly in thick doctor blades, the fastening detent can be formed in the basic material of the doctor blade. The fastening detent section ensures that the doctor blade keeps in place in the blade holder. Doctor blades are usually made of metal, plastic, fiber-reinforced plastic, or a plastic composition. Some known doctor blades are proposed in Finnish patent application No. 20065601.
However, known doctor blades have a number of shortcomings. Firstly, several positions require a certain kind of doctor blade, which increases the number of different doctor blades in a fiber web machine. Moreover, blade holders may set additional requirements for doctor blades. For doctoring of particularly soft-surfaced rolls or belts, plastic blades are used which bend disadvantageously and the blade section of which becomes easily swaged. Plastic blades also bend easily during storage. Adaptation of a bent doctor blade to the roll surface is incomplete, which causes, for example, unevenness in the contact profile or an otherwise incomplete doctoring result. Disturbances in doctoring cause web breaks and local surface pressure variations shorten the fabric life. It is an object of the invention to provide a novel doctor blade for a fiber web machine with more versatile functions than before. Another object of the invention is to provide a novel doctor arrangement in a fiber web machine which arrange- ment can be adapted in many positions. The characteristic features of the doctor blade according to this invention are that in the cross-sectional plane the blade section is asymmetric while the fastening detent section is substantially symmetric so that the doctor blade can be installed in two opposite positions for providing two different functions. Due to the asymmetry of the blade section, the doctor blade is provided with two kinds of property, which diversifies the use of the doctor blade. In other words, one kind of a doctor blade can be used for two different purposes simply by changing the position of the doctor blade. Correspondingly, the characteristic features of the doctor arrangement according to the invention are that in the cross-sectional plane the blade section is asymmetric while the fastening detent section is substantially symmetric so that the doctor blade can be installed in the blade holder by its fastening detent section in two opposite positions for providing two different functions. A symmetric fastening detent section enables to install the doctor blade in the blade holder in both directions. With suitable dimensioning and design the doctor blade fits in the blade holders of vari- ous manufacturers. Thus the doctor blade according to the invention can be installed in most positions in which case a fiber web machine requires fewer different doctor blades compared to heretofore. The invention is described below in detail by making reference to the enclosed drawings which illustrate some of the embodi¬ ments of the invention, in which
Figure 1 shows two doctor arrangements according to the in- vention adapted to the vicinity of a surface to be doctored, Figure 2a is an end view of a first application example of the doctor blade according to the invention,
Figure 2b is an end view of a second application example of the doctor blade according to the invention.
Figure 3 is an axonometric cross-sectional view of the application example of Figure 2a,
Figure 4 shows a modification of the doctor arrangement according to the invention. Figure 1 shows two doctor arrangements according to the invention for a fiber web machine. The doctor blade included in the doctor arrangement is meant particularly for removing water and fine matter from the surface to be doctored. Specifically, the doctor arrangement according to the invention is suitable for doctoring coated rolls, belts and transfer belts as well as open-surfaced rolls. In a fiber web machine, such as a paper or board machine, open-surfaced rolls are used for several different reasons. In a suction roll, for example, the shell is perforated for leading a vacuum effect from the inside of the roll to the outside of it. The holes make the shell open-surfaced. On the other hand, grooved rolls are also used, in which the shell surface is grooved mainly for improving dewatering. A suction roll with a grooved surface also exists, the shell of which is provided with both holes and grooves. In addition to or instead of grooves, blind bores, for example, can be used. Soft coatings are also used in the rolls while belts and transfer belts are soft-surfaced by their nature. In addition, the surface of a belt, for example, can be grooved. Generally, the doctor blade 10 includes a blade section 11 and a fastening detent section 12 (Figures 2a and 2b) . In both embodiments shown in Figure 1, the blade section 11 is adapted to a light contact with the surface 14 of the roll 13. The doctor blade 10 can be loaded, for example, with the blade holder 15 proposed, which includes a fastening plate 16 and a holder 17. The fastening plate 16 is supported to the construe- tions of the fiber web machine and a loading hose 18 is provided between the fastening plate 16 and the holder 17. Here the doctor blade is loaded by pressurizing the loading hose. Correspondingly, the doctor blade can be detached from the surface to be doctored by leading a vacuum to the loading hose for a doctor blade replacement, for example. This blade holder design also includes a presser blade 19 with which the supporting and loading effect of the holder 17 can be extended sufficiently far. In addition, the characteristics of the blade holder can be varied by changing the presser blade.
The profiled lower clamp 20 of the holder 17 together with the presser blade 19 form a gap to which the fastening detent section of the doctor blade 10 is adapted. This ensures that the doctor blade keeps in place in the blade holder while allowing at the same time easy and fast doctor blade replacement. According to the invention, the blade section is asymmetric in the cross-sectional plane while the fastening detent section is substantially symmetric so that the doctor blade can be installed in two opposite positions for providing two different functions. Due to the asymmetric design, the doctor blade is surprisingly provided with two functionalities of which the one that suits the position concerned is selected in each specific case. As is also shown in the figures, the doctor blade is turned in such a way that the surface being the bottom surface of the blade section in one application, is the top surface in the second application and vice versa. At the same time, the one and the same side of the doctor blade is in the gap in both applications. In other words, the doctor blade is turned around about the center axis located in its width direction. According to Figure 2a, this center axis is parallel to the axis of symmetry of the fastening detent section 12. The axis of symmetry is illustrated with a dot-and-dash line in Figures 2a and 2b. The doctor arrangement located in the upper position of Figure 1 corresponds to the first function according to the invention, this function being a doctoring blade. In other words, the tip 21 of the blade section 11 of the doctor blade 10 contacts the surface 14 to be doctored and removes water and impurities. Advantageously, the doctoring blade has a chamfered tip 22 for providing a contact surface. With this, the formation of a linear load is avoided and the doctor blade as if leans to the surface to be doctored over a longer distance than in known applications. The length of the chamfered tip naturally depends on the dimensioning of the doctor blade. Generally, the length of the chamfered tip is 10 - 20% of the width of the doctor blade. In addition, the angle of the chamfered tip is so dimensioned that the chamfered tip can be adapted substantially according to the surface to be doctored. With such a doctor blade, a good doctoring result is achieved even with a small blade load. Furthermore, wearing of the doctor blade is reduced, and above all, the risk of damaging a soft surface is low .
The doctor arrangement located in the lower position of Figure 1 corresponds to the second function according to the invention, this function being a foil blade. The foil blade, too, partly doctors the surface 14 with the tip 21; however, it is essential that a narrow gap is formed between the surface 14 and the doctor blade 10 in which gap a vacuum is created due to the mutual movement of the surface 14 and the doctor blade 10. This vacuum absorbs water and fine matter from the open surface, which is advantageous for the operation of the fiber web machine. Known foil blades are thick and require a holder of the kind completely of their own. Regardless of the application, the doctor blade according to the invention can be used for a blade holder of one kind. This has been achieved by forming the flow surface 23 of the foil blade from an asymmet- ric bulge 24 in the blade section 11. In other words, the blade section of the doctor blade is so asymmetric that it comprises a distinct bulge. Thus the blade holder can be placed in a normal position and used in a normal way.
The dimensioning of the bulge depends greatly on the dimensioning of the doctor blade. Generally, the effective length of the flow surface is about half of the width of the doctor blade. For example, in a 100 mm wide doctor blade, the effective length t of the flow surface 23 is 30 - 60 mm, more advantageously 40 - 55 mm. The effective length is also influ- enced by the rest of the design of the doctor blade. According to the invention, the bulge 24 forms a wedge-shaped blade section 11, whose angle a between the outer surfaces 25 and 26 is 10 - 30°, more advantageously 15 - 20° (Figure 2a). Generally, as this angle grows, the effective length shortens. However, this shortening can be compensated by the design of the doctor blade.
The doctor blade 10 of Figure 2a is dimensioned with consideration to known blade holders. Here the width of the doctor blade is in a class of 100 mm, but narrower or wider ones than this can also be manufactured. Great freedom exists for the dimensioning of the bulge, whereas the fastening detent section must be sufficiently thin to fit in the gap. Here the minimum thickness of the doctor blade is approximately 2.5 mm in which case it suits known blade holders. The thinned part forms a neck 28 which is symmetric together with shoulders 29. Thus the doctor blade can be adapted in the blade holder in two different ways while the holder composed by the shoulders keeps the doctor blade in the gap. The width of the thin area is approxi- mately 25 mm, after which the thickness of the doctor blade increases at least to four millimeters. With this thickening, harmful bending of the doctor blade is avoided.
Besides the novel doctor blade, the blade arrangement according to the invention has new features. According to the invention, the blade section is thus asymmetric in the cross-sectional plane while the fastening detent section is substantially symmetric so that the doctor blade can be installed by its fastening detent section in two opposite positions for providing two different functions. In addition, in the first func- tion, the doctor blade 10 has mainly a doctoring function and it is so adapted that the angle β between the doctor blade 10 and the surface 13 to be doctored is 6 - 16°, more advantageously 10 - 14° (Figure 1) . Then the blade angle formed is advantageously small, whereby it is avoided that the doctor blade bites the soft surface. The biting tendency is also reduced by the above mentioned chamfered tip.
In the second function of the doctor arrangement the foil blade is so adapted that the angle γ between the doctor blade 10 and the surface 13 to be doctored is 1 - 10°, more advantageously 4 - 6° (Figure 1) . The slightly growing gap forms an efficient vacuum effect. At the same time, a space is formed for water between the flow surface and the surface. Advantageously, the doctor arrangement is placed so that water can drop down by gravity after the flow surface. Suction rolls, for example, are provided with collecting pans of their own, while from grooved rolls, water flows to the pans of the press and further to the sewerage. Detached water can also be doctored with another doctor blade according to the invention.
A doctor blade according to the invention is advantageously made of a plastic material so that the doctor blade can be used for doctoring soft roll surfaces, belts and transfer belts. There are several possible plastic materials but advantageously HD or LD polyethylene or polypropylene is used. The raw material of the final product has a high molecular weight and selected alloying additives are used in the manufacture. Specifically, by maximizing the polymerization degree and saturating the raw material with dry grease material and finally by sinter-pressing, a wear resistant and rigid final product is achieved, which is additionally stress-free and stable in form. Using such a material, a doctor blade according to the invention can be manufactured by machining. The production method also enables to manufacture long pieces. Thus the completed doctor blade is seamless. When the doctor blade includes an integral fastening detent section, separate rivetings are unnecessary .
Figure 2b shows the second embodiment of the doctor blade 10 according to the invention. Dimensioning and profiling corre- sponds to the embodiment of Figure 2a excluding the flow surface 23 of the foil blade. Here the bulge 24 is formed with a wing 27. The partly open construction reduces the amount of raw material and the design is also suitable for manufacturing by pultrusion. Pultrusion also enables to manufacture a hollow bulge (not shown) . On the other hand, the doctor blade can be manufactured by combining several pieces. For example, a key-like component can be fastened to a wedge-shaped blade blank as a bulge. Figure 4 shows a modification of the doctor arrangement according to the invention. Here the universal applicability of the doctor blade 10 is illustrated using two different blade holders 15. Functionally similar parts are referred to using identical reference numbers. Figure 4 shows a so called DST blade holder on the left-hand ^side provided with two loading hoses 18. The functional presser blade 19 is composed of an upper plate fastened to the holder 17. Figure 4 shows a so called K35 blade holder on the right-hand side which is rigid and has been fastened to the doctor beam provided with loading elements (not shown) . Here the functional presser blade 19 is composed of the fastening plate 16 of the holder. In addition to these, the doctor blade according to the invention also suits other types of blade holders, such as the applicant's own FiberDoc blade holder, for example. Blade holders can also be provided with a presser blade. In addition, the blade holder can be made of a composite or a metal material. The doctor blade according to the invention is so universal in design that it can be adapted to almost all known blade holders. Moreover, the surprising dual function covers most doctoring positions and requirements. By simply turning the doctor blade, either a doctoring blade or a foil blade is provided. In case the position allows it, a doctor blade that has been used in a doctoring application can be adapted as a foil blade when worn. On the other hand, applicable surface pressures are low and the blade material is wear-resistant so that the doctor blade remains operational for a long time. With the blade according to the invention it is possible to remarkably reduce the number of different doctor blades in a fiber web machine. Moreover, a novel doctor blade can be taken into use without major equipment changes or investments.

Claims

1. Doctor blade for a fiber web machine, the doctor blade (10) including a blade section (11) and a fastening detent section (12), character! zed in that in the cross-sectional plane, the blade section (11) is asymmetric while the fastening detent section (12) is substantially symmetric so that the doctor blade (10) can be installed in two opposite positions for providing two different functions.
2. Doctor blade according to claim 1, characterized in that the first function is a doctoring blade and the second function is a foil blade.
3. Doctor blade according to claim 2, characterized in that the doctoring blade has a chamfered tip (22) for forming a contact surface.
4. Doctor blade according to claim 2, characterized in that the flow surface (23) of the foil blade is composed of an asymmetric bulge (24) in the blade section (11).
5. Doctor blade according to claim 4, characterized in that the effective length of the flow surface (23) is 30 - 50 mm, more advantageously 35 - 45 mm.
6. Doctor blade according to claim 4, characterized in that the bulge (24) forms a wedge-shaped blade section (11), whose angle a between the outer surfaces (25, 26) is 10 - 30°, more advantageously 15 - 20°.
7. Doctor arrangement in a fiber web machine, wherein, in the vicinity of the surface to be doctored, there is arranged a blade holder (15) having a doctor blade (10) adapted thereto which includes a blade section (11) and a fastening detent section (12), characterized in that in the cross-sectional plane, the blade section (11) is asymmetric while the fastening detent section (12) is substantially symmetric so that the doctor blade (10) can be installed in two opposite positions for providing two different functions.
8. Doctor arrangement according to claim 7, characterized in that the first function is a doctoring blade adapted in such a way that the angle β between the doctor blade (10) and the surface to be doctored (13) is 6 - 16°, more advantageously 10 - 14°.
9. Doctor arrangement according to claim 7 or 8, character- i zed in that the second function is a foil blade adapted in such a way that the angle γ between the doctor blade (10) and the surface to be doctored (13) is 1 - 10°, more advantageously 4 - 6°.
10. Doctor arrangement according to any of claims 7 - 9, characterized in that the doctor blade (10) included in the doctor arrangement is a doctor blade according to any of claims 2 - 6.
EP10835547.0A 2009-12-11 2010-11-26 Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine Active EP2510152B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20096312A FI121853B (en) 2009-12-11 2009-12-11 Scraper blade for fiber web machine and scraper assembly in fiber web machine
PCT/FI2010/050966 WO2011070229A1 (en) 2009-12-11 2010-11-26 Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine

Publications (3)

Publication Number Publication Date
EP2510152A1 true EP2510152A1 (en) 2012-10-17
EP2510152A4 EP2510152A4 (en) 2013-05-01
EP2510152B1 EP2510152B1 (en) 2016-05-11

Family

ID=41462776

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Application Number Title Priority Date Filing Date
EP10835547.0A Active EP2510152B1 (en) 2009-12-11 2010-11-26 Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine

Country Status (6)

Country Link
EP (1) EP2510152B1 (en)
CN (1) CN102652197B (en)
DE (1) DE202010018268U1 (en)
ES (1) ES2580205T3 (en)
FI (1) FI121853B (en)
WO (1) WO2011070229A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8771473B2 (en) 2009-12-11 2014-07-08 Valmet Technologies, Inc. Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine
ES1075921Y (en) * 2011-10-26 2012-03-29 Grafometal S A Scraper blade
CN105641999B (en) * 2016-03-16 2017-09-22 柳州市杰特建材有限责任公司 Natural-dehydration case and collection slurry processes dewatering system
CN105639779B (en) * 2016-03-23 2018-03-23 杭州奥科服装辅料有限公司 A kind of adhesion lining cloth and its production technology
CN106493437A (en) * 2016-12-29 2017-03-15 泰州前进科技有限公司 A kind of scraper
US20210316329A1 (en) * 2018-08-31 2021-10-14 Kadant Inc. Doctor blade with polymeric retention means, doctor blade holder comprising such a doctor blade and method for providing retention means on a doctor blade
AT526290B1 (en) * 2022-07-13 2024-09-15 Voith Patent Gmbh Scraper holder and scraper device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184429A (en) * 1972-02-09 1980-01-22 Max Datwyler & Co. Constant bevel doctor blade and method and apparatus using same
US5520731A (en) * 1990-10-20 1996-05-28 Zanders Feinpapiere Ag Doctor blade for use in coating continuous strips of material or similar substrates
FI114328B (en) * 2003-01-30 2004-09-30 Metso Paper Inc Composite construction treatment plant
US20040149414A1 (en) * 2003-01-31 2004-08-05 Watson Robert Bradley Apparatus for removing liquid from a press roll sleeve or belt on a paper making machine
FI20065573A0 (en) * 2006-09-20 2006-09-20 Ike Service Oy Blade and method of making the blade
DE112007002273T8 (en) * 2006-09-27 2009-11-12 Metso Paper, Inc. Method for producing a doctor blade, doctor blade and blade holder

Also Published As

Publication number Publication date
EP2510152B1 (en) 2016-05-11
FI20096312A0 (en) 2009-12-11
EP2510152A4 (en) 2013-05-01
FI121853B (en) 2011-05-13
WO2011070229A1 (en) 2011-06-16
ES2580205T3 (en) 2016-08-22
CN102652197B (en) 2015-10-14
DE202010018268U1 (en) 2015-03-25
CN102652197A (en) 2012-08-29

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