EP2823098A1 - Apparatus for manufacturing fibre pulp from lignocellulose-containing material - Google Patents

Apparatus for manufacturing fibre pulp from lignocellulose-containing material

Info

Publication number
EP2823098A1
EP2823098A1 EP13757781.3A EP13757781A EP2823098A1 EP 2823098 A1 EP2823098 A1 EP 2823098A1 EP 13757781 A EP13757781 A EP 13757781A EP 2823098 A1 EP2823098 A1 EP 2823098A1
Authority
EP
European Patent Office
Prior art keywords
refining
rotary
rear side
disk
wing member
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
EP13757781.3A
Other languages
German (de)
French (fr)
Other versions
EP2823098A4 (en
EP2823098B1 (en
Inventor
Örjan AHLGREN
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
Valmet AB
Original Assignee
Valmet Oy
Valmet AB
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 Oy, Valmet AB filed Critical Valmet Oy
Publication of EP2823098A1 publication Critical patent/EP2823098A1/en
Publication of EP2823098A4 publication Critical patent/EP2823098A4/en
Application granted granted Critical
Publication of EP2823098B1 publication Critical patent/EP2823098B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs

Definitions

  • the invention is related to an apparatus for manufacturing fibre pulp from lignocellulose-containing material, according to the preamble of claim 1 .
  • a disk refiner or grinder comprises a housing enclosing two opposed refining disks, at least one of which is rotary.
  • the refining disks each have refining elements, between which a refining gap is formed for disintegrating lignocellulose-containing material, such as chips from soft- or hardwood, bamboo, straw, bagasse or similar into fibre pulp.
  • the pulp leaves the refiner via a space on the rear side of the rotary refining disk.
  • a problem is that the pulp sticks to said rear side of the rotary refining disk and to the housing and also create forces to the bearings which may destroy them. Build ups of burnt fibre bindles or particles may later come loose and create problems further down the line in other processing steps.
  • a common problem is e.g. spots on board.
  • An object of the invention is to solve the problems with an invention as in claim 1 .
  • Fig. 1 is a schematic cross-sectional view illustrating an apparatus according to an exemplifying embodiment of the invention.
  • Fig. 2 is a schematic front view illustrating the apparatus in Fig. 1 according to an exemplifying embodiment of the invention.
  • Fig. 3 is a schematic front view illustrating the apparatus in Fig. 1 according to another exemplifying embodiment of the invention.
  • Figs. 4a-e are schematic views illustrating the apparatus in Fig. 1 according to further exemplifying embodiments of the invention.
  • a refiner 1 according to the invention is disclosed, which is an example of an apparatus 1 for manufacturing fibre pulp from lignocellulose- containing material.
  • the refiner 1 comprises a housing 2 enclosing a stationary refining disk 3, also called stator, and a rotary refining disk 4, also called rotor.
  • the stationary refining disk 3 may be connected to the housing 2.
  • the rotary refining disk 4 is driven by a motor (not shown) through a rotary shaft 5 and preferably rotates with 1500-2300 rpm. It is also possible to have two rotating refining disks 3, 4.
  • the refining disks 3, 4 are provided on their surfaces facing towards each other with refining elements 6, 7, which between themselves define a refining gap 8, which preferably is 0.1 -2 mm.
  • the stationary refining disk 3 has an inlet 9, through which material to be refined is fed into the gap 8. It is preferable to preheat the material with e.g. steam before feeding into the refiner 1 and to refine under pressure in the refiner 1 . It is also possible to have chemical treatment of the material before feeding into the refiner 1 .
  • the material is preferably first crushed into thin sticks, which by the centrifugal force are fed outwards to a grinding zone, where the fibres are uncovered and worked so that they become soft and so that the surfaces of the fibres get a good binding capability.
  • a space 10 is provided between the housing 2 and a rear side 1 1 of the rotary refining disk 4.
  • the material processed in the refiner 1 is collected in the space 10 and leaves the refiner 1 through an outlet 18.
  • the rear side 1 1 of the rotary refining disk 4 is provided with a centre 14 and a circumference 17. At least one thought radial line 13 extends at least from the centre 14 to the circumference 17.
  • the rear side 1 1 is also provided with at least one wing member 12.
  • the wing members 12 can be part of the rotary refining disk 4 by e.g. making larger or smaller cutouts in the rear side 1 1 between where the wings members 12 are going to be.
  • the wing members 12 are preferable separate from, but attached to the rotary refiner disk 4, because then the wing member 12 can easily be replaced when worn and may also be made from a different material than the rotary refining disk 4, preferably harder. Harder material is often more expensive and since the wing member 12 is a wear part, then the area of the wing members 12 is preferably smaller than the area between the wing members 12. Further, the manufacture of the refiner 1 is simplified if the wing members 12 are separate from the rotary refiner disk 4, instead of having to make cutouts in the rotary refining disk 12.
  • At least one wing member 12 is at a positive angle a, a1 , a2, a3 larger than zero, e.g. around 45°, from a thought radial line 13, towards the direction of rotation R.
  • Different wing members may be at an angle a, a1 , a2, a3 to different thought radial lines 13.
  • the wing members 12 are preferably placed in a pattern that points in a direction opposite to the direction of rotation R.
  • a pattern is defined as one set of wing members 12 that are arranged between the rotary shaft 5 and the circumference 17. A pattern may then be repeated symmetrically around the rotary shaft 5.
  • the wing members 12 are at an angle a, a1 , a2, a3 with a thought radial line 13, the wing members 12 work better than if they had been placed straight radially aligned, since the material is thrown out more efficiently from the centre 14 of the rotary refining disk 4. This gives better cleaning and less wear. Further, energy can be saved since the direction of the transportation of the material will be more directed towards the circumference 17 of the rotary refining disk 4, where the outlet 18 preferably is located.
  • all wing members 12 are at the same angle a from the thought radial lines 13.
  • the wing members 12c further from the centre 14 of the rotary refining disk 4 are arranged at a smaller angle a3 (which in this case may be as small as 0°), than the wing members 12b, 12a closer to the centre 14 of the rotary refining disk 4, which wing members 12b, 12a are placed at increasingly larger angles a2, a1 . This is because the rotation speed of the material is lower closer to the centre 14 and thus a larger angle is preferred.
  • wing members 12, 12a, 12b, 12c are most economical, since they are cheapest to manufacture and you only need to replace the wing members 12, 12a, 12b, 12c that are most worn and therefore not necessarily all at the same time. A stronger attachment may, however, be gained if the wing members 12 are provided with a collar 15, which fits in a corresponding notch 16 in the rear side of the rotary refining disk 4.
  • wing members 12 In Fig. 4a-c is shown schematically other alternatives of wing members 12 where the wing members 12 go more or less the whole way from the rotary shaft 5 to the periphery 17 of the rotary refining disk 4.
  • the wing members 12 may be straight or curved and may have equal or varying width. There may be one wing member 12 going all the way from the rotary shaft 5 to the periphery 17 of the rotary refining disk 4 as in Fig. 4a and 4b. Or else there may be a number of separate wing members 12 arranged from the rotary shaft 5 to the periphery 17, either spaced apart as in Fig. 2, 3, 4d and 4e or overlapping as in Fig. 4c.
  • the wing members 23 are preferably arranged symmetrical with respect to the rotary shaft 5.
  • the figures show 2-4 patterns, but more are possible. The invention is of course not restricted to the shown embodiments, but may be varied within the scope of the claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention is related to an apparatus for manufacturing fibre pulp from lignocellulose-containing material, comprising a housing (2) enclosing two refining disks (3, 4) having opposing refining elements (6, 7), which refining elements (6, 7) between themselves form at least one refining gap (8), in which refining gap (8) the lingocellulose-containing material is arranged to be disintegrated into fibre pulp, wherein at least one refining disk (4) is arranged on a rotary shaft (5) and is rotary in a direction of rotation (R) and having a rear side (11) away from the refining gap (8), so that a space (10) is created between the rear side (11) of the rotary refining disk (4) and the housing (2), which rear side (11) is provided with a centre (14), a circumference (17) and at least one wing member (12, 12a, 12b, 12c) arranged to prevent pulp from sticking on the rear side (11). According to the invention, the rotary refining disk (4) has at least one thought radial line (13) on its rear side (11) extending from the centre (14) to the circumference (17) and in that at least one wing member (12, 12a, 12b, 12c) is attached to the rear side (11) at an (α, α1, α2, α3) from the at least one thought radial line (13) and towards the direction of rotation (R).

Description

APPARATUS FOR MANUFACTURING FIBRE PULP FROM LIGNOCELLULOSE-CONTAINING MATERIAL
TECHNICAL FIELD
The invention is related to an apparatus for manufacturing fibre pulp from lignocellulose-containing material, according to the preamble of claim 1 .
BACKGROUND
A disk refiner or grinder comprises a housing enclosing two opposed refining disks, at least one of which is rotary. The refining disks each have refining elements, between which a refining gap is formed for disintegrating lignocellulose-containing material, such as chips from soft- or hardwood, bamboo, straw, bagasse or similar into fibre pulp. The pulp leaves the refiner via a space on the rear side of the rotary refining disk. A problem is that the pulp sticks to said rear side of the rotary refining disk and to the housing and also create forces to the bearings which may destroy them. Build ups of burnt fibre bindles or particles may later come loose and create problems further down the line in other processing steps. A common problem is e.g. spots on board.
It is known to have straight wing elements aligned along thought radial lines on the rear side of the rotary refining disks to prevent pulp to stick to the rear side and/or the housing. A problem with them is that they are not efficient enough. Further, they have a tendency to create turbulence, which creates wear.
SUMMARY
An object of the invention is to solve the problems with an invention as in claim 1 . By placing the wing members in a positive angle from a thought radial line and towards a direction of rotation, a better cleaning and less wear of the rear side of the rotary refining disk is obtained. Further, energy can be saved since the direction of the transportation of the particles will be more directed towards the circumference of the refining disk, where an outlet preferably is located. .
Other advantages may be obtained by the different embodiments in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS
The invention, together with further objects and advantages thereof, may best be understood by reference to the following description and appended drawings, in which:
Fig. 1 is a schematic cross-sectional view illustrating an apparatus according to an exemplifying embodiment of the invention.
Fig. 2 is a schematic front view illustrating the apparatus in Fig. 1 according to an exemplifying embodiment of the invention.
Fig. 3 is a schematic front view illustrating the apparatus in Fig. 1 according to another exemplifying embodiment of the invention. Figs. 4a-e are schematic views illustrating the apparatus in Fig. 1 according to further exemplifying embodiments of the invention.
DETAILED DESCRIPTION
In Fig. 1 and 2 a refiner 1 according to the invention is disclosed, which is an example of an apparatus 1 for manufacturing fibre pulp from lignocellulose- containing material. The refiner 1 comprises a housing 2 enclosing a stationary refining disk 3, also called stator, and a rotary refining disk 4, also called rotor. The stationary refining disk 3 may be connected to the housing 2. The rotary refining disk 4 is driven by a motor (not shown) through a rotary shaft 5 and preferably rotates with 1500-2300 rpm. It is also possible to have two rotating refining disks 3, 4. The refining disks 3, 4 are provided on their surfaces facing towards each other with refining elements 6, 7, which between themselves define a refining gap 8, which preferably is 0.1 -2 mm.
The stationary refining disk 3 has an inlet 9, through which material to be refined is fed into the gap 8. It is preferable to preheat the material with e.g. steam before feeding into the refiner 1 and to refine under pressure in the refiner 1 . It is also possible to have chemical treatment of the material before feeding into the refiner 1 .
In the gap 8, the material is preferably first crushed into thin sticks, which by the centrifugal force are fed outwards to a grinding zone, where the fibres are uncovered and worked so that they become soft and so that the surfaces of the fibres get a good binding capability.
A space 10 is provided between the housing 2 and a rear side 1 1 of the rotary refining disk 4. The material processed in the refiner 1 is collected in the space 10 and leaves the refiner 1 through an outlet 18.
The rear side 1 1 of the rotary refining disk 4 is provided with a centre 14 and a circumference 17. At least one thought radial line 13 extends at least from the centre 14 to the circumference 17.
To prevent the processed material from sticking to the rear side 1 1 of the rotary refining disk 4 and to the housing 2, the rear side 1 1 is also provided with at least one wing member 12. The wing members 12 can be part of the rotary refining disk 4 by e.g. making larger or smaller cutouts in the rear side 1 1 between where the wings members 12 are going to be. However, the wing members 12 are preferable separate from, but attached to the rotary refiner disk 4, because then the wing member 12 can easily be replaced when worn and may also be made from a different material than the rotary refining disk 4, preferably harder. Harder material is often more expensive and since the wing member 12 is a wear part, then the area of the wing members 12 is preferably smaller than the area between the wing members 12. Further, the manufacture of the refiner 1 is simplified if the wing members 12 are separate from the rotary refiner disk 4, instead of having to make cutouts in the rotary refining disk 12.
Instead of placing all the wing members 12 straight radially aligned, at least one wing member 12 is at a positive angle a, a1 , a2, a3 larger than zero, e.g. around 45°, from a thought radial line 13, towards the direction of rotation R. Different wing members may be at an angle a, a1 , a2, a3 to different thought radial lines 13. The wing members 12 are preferably placed in a pattern that points in a direction opposite to the direction of rotation R. A pattern is defined as one set of wing members 12 that are arranged between the rotary shaft 5 and the circumference 17. A pattern may then be repeated symmetrically around the rotary shaft 5. Since the wing members 12 are at an angle a, a1 , a2, a3 with a thought radial line 13, the wing members 12 work better than if they had been placed straight radially aligned, since the material is thrown out more efficiently from the centre 14 of the rotary refining disk 4. This gives better cleaning and less wear. Further, energy can be saved since the direction of the transportation of the material will be more directed towards the circumference 17 of the rotary refining disk 4, where the outlet 18 preferably is located.
In Fig. 2, all wing members 12 are at the same angle a from the thought radial lines 13. However, preferably, as in Fig. 3, the wing members 12c further from the centre 14 of the rotary refining disk 4 are arranged at a smaller angle a3 (which in this case may be as small as 0°), than the wing members 12b, 12a closer to the centre 14 of the rotary refining disk 4, which wing members 12b, 12a are placed at increasingly larger angles a2, a1 . This is because the rotation speed of the material is lower closer to the centre 14 and thus a larger angle is preferred.
Small, straight, separate wing members 12, 12a, 12b, 12c as in Fig. 2 and 3 are most economical, since they are cheapest to manufacture and you only need to replace the wing members 12, 12a, 12b, 12c that are most worn and therefore not necessarily all at the same time. A stronger attachment may, however, be gained if the wing members 12 are provided with a collar 15, which fits in a corresponding notch 16 in the rear side of the rotary refining disk 4.
In Fig. 4a-c is shown schematically other alternatives of wing members 12 where the wing members 12 go more or less the whole way from the rotary shaft 5 to the periphery 17 of the rotary refining disk 4. The wing members 12 may be straight or curved and may have equal or varying width. There may be one wing member 12 going all the way from the rotary shaft 5 to the periphery 17 of the rotary refining disk 4 as in Fig. 4a and 4b. Or else there may be a number of separate wing members 12 arranged from the rotary shaft 5 to the periphery 17, either spaced apart as in Fig. 2, 3, 4d and 4e or overlapping as in Fig. 4c. For stability the wing members 23 are preferably arranged symmetrical with respect to the rotary shaft 5. The figures show 2-4 patterns, but more are possible. The invention is of course not restricted to the shown embodiments, but may be varied within the scope of the claims.

Claims

1 . Apparatus for manufacturing fibre pulp from lignocellulose- containing material, comprising a housing (2) enclosing two refining disks (3, 4) having opposing refining elements (6, 7), which refining elements (6, 7) between themselves form at least one refining gap (8), in which refining gap (8) the lingocellulose-containing material is arranged to be disintegrated into fibre pulp, wherein at least one refining disk (4) is arranged on a rotary shaft (5) and is rotary in a direction of rotation (R) and having a rear side (1 1 ) away from the refining gap (8), so that a space (10) is created between the rear side (1 1 ) of the rotary refining disk (4) and the housing (2), which rear side (1 1 ) is provided with a centre (14), a circumference (17) and at least one wing member (12, 12a, 12b, 12c) arranged to prevent pulp from sticking on the rear side (1 1 ), characterised in that the rotary refining disk (4) has at least one thought radial line (13) on its rear side (1 1 ) extending from the centre (14) to the circumference (17) and in that at least one wing member (12, 12a, 12b, 12c) is attached to the rear side (1 1 ) at a positive angle (a, a1 , a2, a3) from the at least one thought radial line (13) and towards the direction of rotation (R).
2. Apparatus according to claim 1 , characterised in that the at least one wing member (12, 12a, 12b, 12c) is integrated into the rotary refining disk (4).
3. Apparatus according to claim 1 , characterised in that the at least one wing member (12, 12a, 12b, 12c) is separated from and attached to the rotary refining disk (4).
4. Apparatus according to any of the claims 1 -3, characterised in that a wing member (12a, 12b) further from the centre (14) of the rotary refining disk (4) is at a smaller angle (a1 , a2) from the at least one thought radial line (13) than a wing member (12b, 12c) closer to the centre (14) of the rotary refining disk (4).
5. Apparatus according to any of the claims 1 -3, characterised in that all wing members (12, 12a, 12b, 12c) are at the same angle (a, a1 , a2, a3) from the at least one thought radial line (13).
6. Apparatus according to any of the claims 1 -5, characterised in that the at least one wing member (12, 12a, 12b, 12c) is of a harder material than the rotary refining disk (4).
7. Apparatus according to any of the claims 1 -6, characterised in that the at least one wing member (12, 12a, 12b, 12c) is provided almost all the way from the rotary shaft (5) to the circumference (17) of the rotary refining disk (4).
8. Apparatus according to any of the claims 1 -6, characterised in that more than one separate wing member (12, 12a, 12b, 12c) are provided between the rotary shaft (5) and the circumference (17) of the rotary refining disk (4).
9. Apparatus according to any of the claims 1 -8, characterised in that the rotary refining disk (4) is provided with notches (16) and in that the wing members (12, 12a, 12b, 12c) are provided with collars (15) fitting in the notches (16).
10. Apparatus according to any of the claims 1 -9, characterised in that a pattern is defined as one set of wing members (12) that are arranged between the rotary shaft (5) and the circumference (17), which pattern is repeated symmetrically around the rotary shaft (5).
EP13757781.3A 2012-03-05 2013-02-20 Apparatus for manufacturing fibre pulp from lignocellulose-containing material Active EP2823098B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1250207A SE537048C2 (en) 2012-03-05 2012-03-05 Apparatus for producing fibrous pulp of lignocellulosic material
PCT/SE2013/050144 WO2013133750A1 (en) 2012-03-05 2013-02-20 Apparatus for manufacturing fibre pulp from lignocellulose-containing material

Publications (3)

Publication Number Publication Date
EP2823098A1 true EP2823098A1 (en) 2015-01-14
EP2823098A4 EP2823098A4 (en) 2016-01-13
EP2823098B1 EP2823098B1 (en) 2017-05-03

Family

ID=49117108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13757781.3A Active EP2823098B1 (en) 2012-03-05 2013-02-20 Apparatus for manufacturing fibre pulp from lignocellulose-containing material

Country Status (4)

Country Link
EP (1) EP2823098B1 (en)
CN (1) CN104145059B (en)
SE (1) SE537048C2 (en)
WO (1) WO2013133750A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019104105B3 (en) * 2019-02-19 2020-06-18 Voith Patent Gmbh Grinding set segment
SE542986C2 (en) * 2019-03-13 2020-09-22 Valmet Oy Double disc pulp refiner comprising a center plate
CN110314734A (en) * 2019-08-01 2019-10-11 黄志云 A kind of fiberizer and its refining device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI18090A (en) * 1936-01-04 1938-05-13 Biffar Louise Machinery for treating wood chips and pulp or the like for the manufacture of fibrous material
GB641298A (en) * 1948-02-23 1950-08-09 John Wild & Sons Ltd Improved machine for beating and refining paper making stock
GB757862A (en) * 1954-02-05 1956-09-26 Bauer Bros Co Disc mill
GB943882A (en) 1962-01-09 1963-12-11 Sprout Waldron & Co Inc Attrition mill apparatus
SE435532B (en) * 1983-02-22 1984-10-01 Sunds Defibrator SET AND DEVICE FOR MANUFACTURING FIBER MASS FROM LIGNOCELLULOSALLY MATERIAL
US4725336A (en) 1985-01-31 1988-02-16 Swm Corporation Refiner apparatus with integral steam separator
US4820381A (en) * 1987-02-25 1989-04-11 Internationa Paper Company Pulp refiner with fluidizing inlet
SE519395C2 (en) * 2000-06-08 2003-02-25 Valmet Fibertech Ab Template segments and grinding apparatus comprising the template segment

Also Published As

Publication number Publication date
EP2823098A4 (en) 2016-01-13
EP2823098B1 (en) 2017-05-03
CN104145059B (en) 2016-05-04
WO2013133750A1 (en) 2013-09-12
SE1250207A1 (en) 2013-09-06
SE537048C2 (en) 2014-12-16
CN104145059A (en) 2014-11-12

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