EP1112123B1 - Segment d'une plaque de raffineur - Google Patents

Segment d'une plaque de raffineur Download PDF

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Publication number
EP1112123B1
EP1112123B1 EP98944457A EP98944457A EP1112123B1 EP 1112123 B1 EP1112123 B1 EP 1112123B1 EP 98944457 A EP98944457 A EP 98944457A EP 98944457 A EP98944457 A EP 98944457A EP 1112123 B1 EP1112123 B1 EP 1112123B1
Authority
EP
European Patent Office
Prior art keywords
bar
leading
trailing
top surface
grooves
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.)
Expired - Lifetime
Application number
EP98944457A
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German (de)
English (en)
Other versions
EP1112123A1 (fr
Inventor
Luc Gingras
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.)
Durametal Corp
Original Assignee
Durametal Corp
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 Durametal Corp filed Critical Durametal Corp
Publication of EP1112123A1 publication Critical patent/EP1112123A1/fr
Application granted granted Critical
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    • 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
    • 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

Definitions

  • the present invention relates generally to disc refiners for lignocellulosic material. More particularly, the present invention relates to refiner plate segments for such an apparatus.
  • the wood fibers are worked between two relatively rotating discs on which refiner plates are mounted.
  • the plates usually have radial bars and grooves.
  • a large volume of steam is produced between the plates as a result of this refining work.
  • the fibrous material must be retained between the plates on the bar surfaces despite the high velocity of the flowing steam, and the enormous centrifugal forces.
  • the steam is exhausted via the grooves. Dams which extend to the bar surface are provided in the grooves to interrupt material flow and thus improve the retention time of the material in the refining region.
  • the bars provide impacts or pressure pulses which separate and fibrillate the fibers.
  • the grooves enable radially directed feeding of the fibers and steam extraction. Near the perimeter of the plates, high radial steam flow and high centrifugal force both act to sweep the fibers outwardly from between the plates prematurely, thus reducing the refining effectiveness.
  • the flow restrictions due to a small gap between opposed plates and fiber-filled grooves result in a steam pressure peak between the plates, located radially inward from the perimeter. This pressure peak is a major source of the refining thrust load, and can induce control instability at high motor loads. It is thus desirable that the steam generated during refining be discharged from the refining region as quickly as possible, while retaining the pulp within the region as long as possible.
  • the surface dams promote better and more homogeneous refining and help develop the pulp pad between the segments, they restrict the flow of steam in the grooves. Reduced steam flow results in higher pressure peaks, creating a greater thrust load and more instability.
  • EP-A-565 779 discloses a refiner plate segment having an inner, primary refining zone and an outer, secondary refining zone. Improved steam flow and material retention may be achieved through the use of the two refining zones described above, that only the primary refining zone requires dams and that such dams have one single height portion.
  • US-A-5 476 228 discloses a refiner plate having a combination of shallow grooves and deep grooves where the combination provides increased openness while retaining bar strength. Both grooves have dams of similar height, however the dams in the deep grooves leave an open cross section for improved steam flow. There exists the problem, that also a lot of the material passes along the groove without being deflected to get into the refining zone.
  • US-A-5 373 995 discloses a refiner plate whose grooves are blocked by dams and intergroove slots connecting neighboring grooves forming venting passages for steam in the form of a zigzag course which bypasses the refining zone.
  • WO-A-95 25199 discloses a refiner segment with special curved breaker bars and dams also between neighboring bars. In addition it shows how the segment is mounted by bolts.
  • the invention is a refiner plate segment for refining lignocellulosic material.
  • the refiner plate segment has a refining zone comprising a plurality of alternating, substantially radially disposed bars and grooves.
  • Each of the bars has a top grinding surface, a leading surface and a trailing surface.
  • At least one dam extends radially across a groove intermediate the leading bar and the trailing bar of a bar pair.
  • the dam comprises a first portion extending from the trailing surface of the leading bar and a second portion extending from the leading surface of the trailing bar
  • Each of the portions of the dam have a top surface, where the top surface of the first portion is substantially co-planar with the top surface of the bars and the top surface of the second portion is disposed intermediate the top surface of the bars and the base of the groove.
  • a plurality of the dams are disposed in each of the grooves.
  • the leading surface and the top surface of the trailing bar define a cavity disposed adjacent the second portion of the dam.
  • the cavity creates an arcuate shaped segment in the leading face of the trailing bar and has a bottom which is substantially co-planar with the top surface of the second portion of the dam to reduce the possibility of inducing turbulence in the flow of material.
  • a refiner plate having a steam management system in accordance with the present invention comprises a plurality of refiner plate segments 10 which are securable to the front face of a substantially circular refiner disc 12 (Figure 3).
  • each segment 10 has two zones 14, 16 each having a differently oriented set of patterns, each segment 10 could alternatively have a single, three or more zones having respective sets of patterns ( Figure 1).
  • the plate segments 10 are attached to the disc face, in any convenient or conventional manner, such as by bolts (not shown) passing through bores 18. One end of the bolt engages the disc and at the other end has head structure bearing against a countersunk surface 20.
  • the refiner plate segments 10 are arranged side-by-side on the face of the disc 12, to form a substantially annular refiner face 22, shown generally at ( Figure 3).
  • the refiner face 22 forms a portion of a refiner region, when confronting another refiner plate (not shown) carried by another disc.
  • each refiner plate segment 10 has an inner edge 24 near the center of the disc, an outer edge 26 near the periphery of the disc, and trailing and leading side edges 28, 30 which abut the leading and trailing side edges of adjacent refiner plate segments, respectively.
  • the remainder of this description will refer to a single plate segment 10, but it should be understood that all the segments 10 which define the annular plate, are preferably substantially similar.
  • the plate segment 10 has, on its face, at least one, and preferably two or three, distinct patterns of bars 32 and grooves 34 between the bars, whereby material to be refined can flow in the grooves 34 in the general direction from the inner edge 24 to the outer edge 26 of the plate segment 10.
  • the bars 32 and grooves 34 extend substantially radially, i.e., radially, or parallel to a radius of the disc 12, or obliquely at an acute angle to such a radius.
  • a first or inlet zone 14 has a multiplicity of bars 36 and grooves 38 between adjacent bars 36, all of which extend substantially in the radial direction. This pattern is especially adapted for receiving wood chips, wood pulp, or the like and performing an initial refining operation thereon to reduce the size of the material and funnel it radially outward into a second, refining zone 16.
  • the refining zone 16 has a multiplicity of bars 40 and grooves 42 between adjacent bars 40, which also extend in parallel, substantially radially.
  • a third, outer zone may be provided between the refining zone 16 and the outer edge 26 of the plate. As shown in Figure 1, each zone 14, 16 may comprise a plurality of fields 44, 44', where each field 44, 44' has a uniform pattern.
  • the segment 10 has two fields 44, 44' in each zone 14, 16.
  • the patterns promote the flow of steam radially outward to the outer edge of the disc and radially inward to the inner edge of the disc for evacuation while retarding the flow of material to ensure that the material is fully refined.
  • the partially refined material is directed, as a result of centrifugal force, radially outward.
  • Substantial quantities of steam are also generated in the refining zone 16 producing a steam flow with high radial velocity.
  • the centrifugal forces acting on the steam and partially refined chips increase dramatically as the material moves farther and farther radially outward.
  • the steam be quickly exhausted from the refining region, it is essential that the partially refined fibers not be prematurely exhausted along with the steam. This condition is influenced by the radial pressure profile along the disc face due to steam generated by the refining at high consistency. Since the pressure peak is between the inner and outer edges 24, 26 of the plate, the steam flows forward (radially outward) from the outer side of the pressure peak and backward (radially inward) inside the pressure peak, against the material feed.
  • the refining zone 16 of a first embodiment of refiner plate segment 10 includes a plurality of partial dams 46 disposed in each of the grooves 42.
  • Each dam 46 includes a full height portion 48 having a top surface 50 which is substantially co-planar with the top grinding surface 52 of the bars 40 and a partial height portion 54 having a top surface 56 disposed intermediate the top surface 52 of the bars 40 and the base 58 of the grooves 42.
  • the full height portion 48 extends from the leading surface 60 of an adjacent trailing bar 62 to a point P intermediate the leading edge 64 of the trailing bar 62 and the trailing edge 66 of an adjacent leading bar 68.
  • the partial height portion 54 extends from point P to the trailing face 70 of the leading bar 68.
  • the relative width of the full height portion 48 and the partial height portion 54, the height of the partial height portion 54, and the shape of the partial dam 46 are dependent on the characteristics of the material to be refined and the degree of refining that is desired.
  • point P may be substantially mid way between the leading edge 64 of the trailing bar 62 and the trailing edge 66 of the leading bar 68 and the partial height portion 54 may extend substantially half way up the height of the groove 42, as shown in Figure 3.
  • the fibers or material in the groove 42 has a tendency to travel along the leading surface or face 60 of the trailing bar 62. Therefore, the full height portion 48 is positioned adjacent the leading face 60 of the trailing bar 62 to block the flow of material through the grooves 42 and to force such material up into the gap between the opposed refiner plates for further refining.
  • the dam 46 may have a radially extending ramp face 72 to guide the material out of the groove 42 and into the gap.
  • the steam flowing through the passage 74 provided by the partial height portion 54 adjacent the trailing face 70 of the leading bar 68 carries very little material. Therefore, the amount of material that bypasses each partial dam 46 is very small.
  • each leading bar 68' may also be removed to form a cavity 76 which extends the cross-sectional area of the passage 74' defined by the partial height portion 54 of the dam 46.
  • the cavity 76 forms an arcuate-shape trailing face segment 78 adjacent the partial dam 46.
  • Such a shape minimizes the turbulence on the inboard side of the partial dam 46 which could cause additional material to be entrained in the steam that passes through the flow passage 74'.
  • the bottom surface 80 of the cavity 76 is substantially co-planar with the top 56 of the partial height portion 54 to provide a relatively smooth surface that minimizes turbulence.
  • the additional flow area provides for increased steam flow with little or no additional bypass flow of material.
  • US-A-5 893 525 filed July 1, 1997 and published April 13, 1999, assigned to the assignee of the subject invention discloses a refiner plate having a variable pitch.
  • One or more fields in the refining zone of such a refiner plate may have a combination of wide, deep grooves 82 and shallow, narrow mini-grooves 84.
  • the wider and deeper grooves 82 provide a greater cross-sectional area for the flow of steam.
  • the blades 86 created by the mini-grooves 84 define additional grinding surfaces and cause additional pulsations during refining operations, increasing the grinding efficacy of the refiner disc.
  • a variable pitch refiner may also include partial dams 46' in accordance with the subject invention.
  • Each dam 46' includes a full height portion 48' having a top surface 50' which is substantially co-planar with the top grinding surface 52' of the blades 86 and a partial height portion 54' having a top surface 56' disposed intermediate the top surface 52' of the blades 86 and the base 58' of the wide grooves 82.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)

Claims (8)

  1. Un segment de plaque de raffineur (10) pour raffiner de la matière lignocellulose, comprenant une zone de raffinage (16) avec une pluralité de barrettes (40) disposées essentiellement radialement, chacune de ces barrettes ayant une face supérieure (52), une face avant (60) et une face arrière (70), cette pluralité de barrettes formant une pluralité de paires de barrettes comprenant chacune une barrette avant (68) et une barrette arrière (62); une pluralité de rainures (42) en alternance avec les barrettes, chacune de ces rainures formant une base (58); au moins une digue (46) s'étendant latéralement à travers la rainure (42) entre la barrette avant (68) et la barrette arrière (62) d'au moins une paire de barrettes, caractérisé en ce que la digue comporte une première partie (54) s'étendant de la face arrière (70) de la barrette avant (68), et une deuxième partie (48) s'étendant de la face avant (60) de la barrette arrière (62), la première et la deuxième partie de la digue ayant chacune une face supérieure dans laquelle la face supérieure (50) de la deuxième partie (48) est disposée essentiellement coplanairement à la face supérieure (52) de la barrette arrière (62) et la surface supérieure (56) de la première partie (54) est disposée entre la face supérieure (52) de la barrette avant (68) et la base (58) de la rainure (42).
  2. Segment de raffineur selon la revendication 1, caractérisé en ce qu'au moins une des digues (46) est disposée dans chaque rainure (42).
  3. Segment de raffineur selon la revendication 2, caractérisé en ce qu'une pluralité de digues (46) est disposée dans chaque rainure (42).
  4. Segment de raffineur selon la revendication 1, caractérisé en ce que la face arrière (70) et la face supérieure (50) de la barrette avant (68) forment une cavité (76) disposée adjacente à la première partie (54) de la digue (46).
  5. Segment de raffineur selon la revendication 4, caractérisé en ce que la face arrière (70) de la barrette avant (68) comporte un segment arqué (78) qui forme la cavité (76).
  6. Segment de raffineur selon la revendication 4, caractérisé en ce que la cavité (76) a une base (80) essentiellement coplanaire à la face supérieure (56) de la première partie (54) de la digue (46).
  7. Segment de raffineur selon la revendication 1, caractérisé en ce que chacune des digues (46) a une face avant inclinée (72) s'étendant radialement.
  8. Segment de raffineur selon la revendication 1, caractérisé en ce que la face supérieure (52) comporte une pluralité de barrettes (40), chacune des barrettes définissant au moins une rainure mini (84), aucune des digues (46) étant disposée dans la rainure mini.
EP98944457A 1998-08-19 1998-08-19 Segment d'une plaque de raffineur Expired - Lifetime EP1112123B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1998/017184 WO2000010710A1 (fr) 1998-08-19 1998-08-19 Systeme de controle de la circulation de la vapeur dans une plaque de raffineur

Publications (2)

Publication Number Publication Date
EP1112123A1 EP1112123A1 (fr) 2001-07-04
EP1112123B1 true EP1112123B1 (fr) 2002-10-02

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Application Number Title Priority Date Filing Date
EP98944457A Expired - Lifetime EP1112123B1 (fr) 1998-08-19 1998-08-19 Segment d'une plaque de raffineur

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EP (1) EP1112123B1 (fr)
KR (1) KR20010106424A (fr)
AU (1) AU742531B2 (fr)
CA (1) CA2337636C (fr)
DE (1) DE69808524T2 (fr)
WO (1) WO2000010710A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11965290B2 (en) 2018-01-02 2024-04-23 International Paper Company Apparatus and method for processing wood fibers
US11982054B2 (en) 2018-01-02 2024-05-14 International Paper Company Apparatus and method for processing wood fibers

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9968938B2 (en) * 2012-09-17 2018-05-15 Andritz Inc. Refiner plate with gradually changing geometry
US20140110511A1 (en) * 2012-10-18 2014-04-24 Andritz Inc. Refiner plates with short groove segments for refining lignocellulosic material, and methods related thereto
CA3114202A1 (fr) 2018-10-11 2020-04-16 Andritz Inc. Plaque de raffineur ayant des saillies d'usure entre les barres
WO2020163459A1 (fr) 2019-02-06 2020-08-13 Andritz Inc. Segments de plaque de raffineur comportant des rainures d'alimentation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE441649B (sv) * 1982-12-15 1985-10-28 Sca Development Ab For bearbetning av cellulosahaltigt material avsett malsegment
FI73256C (fi) * 1984-10-19 1987-09-10 Yhtyneet Paperitehtaat Oy Malsegment.
US5181664A (en) * 1992-04-17 1993-01-26 Andritz Sprout-Bauer, Inc. Grinding plate with angled outer bars
US5373995A (en) * 1993-08-25 1994-12-20 Johansson; Ola M. Vented refiner and venting process
US5476228A (en) * 1994-03-07 1995-12-19 Beloit Technologies, Inc. Refiner disk with alternating depth grooves
AU2117695A (en) * 1994-03-15 1995-10-03 Beloit Technologies, Inc. Breaker bar section for a high consistency refiner
US5893525A (en) * 1997-07-01 1999-04-13 Durametal Corporation Refiner plate with variable pitch
US6032888A (en) * 1999-04-16 2000-03-07 Durametal Corporation Refiner plate with interspersed surface and subsurface dams

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11965290B2 (en) 2018-01-02 2024-04-23 International Paper Company Apparatus and method for processing wood fibers
US11982054B2 (en) 2018-01-02 2024-05-14 International Paper Company Apparatus and method for processing wood fibers

Also Published As

Publication number Publication date
AU9199498A (en) 2000-03-14
DE69808524T2 (de) 2003-06-26
CA2337636C (fr) 2004-12-14
CA2337636A1 (fr) 2000-03-02
EP1112123A1 (fr) 2001-07-04
KR20010106424A (ko) 2001-11-29
DE69808524D1 (de) 2002-11-07
WO2000010710A1 (fr) 2000-03-02
AU742531B2 (en) 2002-01-03

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