US3674217A - Pulp fiberizing grinding plate - Google Patents

Pulp fiberizing grinding plate Download PDF

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Publication number
US3674217A
US3674217A US59660A US3674217DA US3674217A US 3674217 A US3674217 A US 3674217A US 59660 A US59660 A US 59660A US 3674217D A US3674217D A US 3674217DA US 3674217 A US3674217 A US 3674217A
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ribs
grinding
plate
working area
angle
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US59660A
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Rolf Bertil Reinhall
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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

Definitions

  • ABSTRACT berizing grinding plate or disc known in the art as the Asplund De [54] PULP FIBERIZING GRINDING PLATE [72] Inventor: Rolf Berti] Reinhall, 16, Killingevagen, Apulp Lidingo, 3,Sweden brator, employed for breaking down wood chips, or the like fibrous material into :bers for use in various 13 Claims, 5 Drawing Figures l PTNTl-INULv 41972 INVENTOR ROLF REINHALL MIM ATTORNEYS ⁇ PULP FIBERIZING GRINDING PLATE BACKGROUND OF THE INVENTION
  • This invention relates to the art of fiber separation, and more particularly to an improved grinding plate for use in breaking up brous materials into their constituent fibers.
  • These grinding plates as conventionally employed, comprise a rotating disc or plate, having a plurality of spaced ridges, moving against an opposed surface having similarly arranged ridges, with the stock fed between the relatively moved ridge surfaces so as to crush the stock into a brous pulp.
  • the action is of a grinding nature, and it is common to refer to such discs as grinding discs or plates.
  • the quality of the fibrous pulp produced by any of these grinding plates is determined by an analysis of the liber length of the fibers comprising the pulp. This fiber length is dependent on nature of the stock fed to the discs, and on the nature of the grinding action.
  • Grinding plates generally comprise a plurality of arcuate segments arranged end-to-end around the center portion of the disc.
  • the segments are formed with ribbed grinding faces, and the disc is mounted to move against a surface having similar ribs.
  • the chips of the stock to be ground are delivered to the center of the grinding disc where they are thrown outward by the centrifugal force imparted to them.
  • Fiber separation takes place as the steam softened chips pass between the grinding segments, thus the centrifugal force of the rotating plate carries the chips between the ridges on opposed faces, and in moving between these ridges, the chips are broken down into their fiber constituents.
  • the ridges extend substantially radially over the surface of the plate.
  • the chips which are being moved across the working area of the plate are thus crushed between the relatively moving ridges.
  • the relatively moving ridges simultaneously act as a pair of shears on the fibers being separated from the chips, with the result that the fibers are cut as they are separated from the chip. ⁇ 'This produces an undesirably small fiber length in the fibrous pulp.
  • the present improved grinding plate or disc has been evolved serving to crush the chips of fibrous material to break the chips into their fibrous constituents, with minimal cutting of the fibers, and in a fashion such that the entire working area of the grinding plate is kept filled with material being processed.
  • a further object of the invention is to provide a grinding plate with a working surface configuration such that the rate of feed along the plate working surface of the chips being ground into their fibrous constituents is controlled so that the entire working surface of the plate segment is filled.
  • a grinding plate segment with a plurality of ridges arranged over the working surface of the segment so that at the inner end of the ridge on the working area, the ridges lie at an angle of between 0 and 60 to a radius extending from the center of the grinding plate to the point of interception of the working area, with the ridges transitioning across the working area at a gradually increasing angle to a plate radius extending from the center of rotation of the first mentioned radius so that at the leaving end of the working area, the grinding ridge lies at an aiigle of between 65 and 90 to the last mentioned radius.
  • a feature of the invention resides in the fact that the ridges or ribs which exert a pushing force on the chips being processed, not only minimize fiber damage, but reduce wear on the giinding ridges.
  • Another feature of the invention resides in the fact that the formation of the ridges or ribs with channels therebetween of gradually restricted cross section permits a relatively uniform continuity of out-put of the pulp from the grinding equipment.
  • FIG. 1 is a plan view of a grinding disc segment showing the working area formed with ridges or ribs contoured in accordance with the teachings of this invention
  • FIG. 2 is an enlarged cross sectional view taken on line 2-2 of FIG. 1 illustrating how the ridges are formed to permit the pulp to roll from one channel to the other;
  • FIG. 3 is a cross sectional view taken on line 3-3 through a dam ridge at the end of a channel;
  • FIG. 4 is an enlarged schematic view showing the action of the ridges on a pulp chip caught therebetween;
  • FIG. 5 is a schematic view showing the action of the ridges on the pulp chip of a conventional grinding disc.
  • the grinding plate segment 10 illustrated in FIG. l is of an arcuate configuration, conventionally formed by casting in the shape of the illustrated configuration.
  • the lateral edges 12 and 14 of the illustrated segment 10 lie along the radii of the grinding disc of which the illustrated segment 10 will form a part, as hereinafter described.
  • a plurality of spaced ridges or ribs 15 are formed on the segment l0, with these ribs l5 extending from a point towards the inner edgel of the work area (closer to the lower end of the illustrated grinding segment) to a point at the periphery 22 of the segment.
  • the segment is fiornied with a center of curvature 18 about which arcs 20 and 22 are swung defining the beginning and end respectively of the working area 25 of the plate.
  • ridge 15l merges into ridge 152, connected by connecting ridge portion 153, from which ridge 154 extends.
  • the specific parameters of the radii may be varied. However, it is found preferable to form the rib arc circle of a radius between 50 and 90 percent of that of the radius of the circle defining the beginning of the working area.
  • the velocity of feed of the fibrous material is inversely proportional to the angle of inclination of the ribs so that the velocity of feed decreases as the rib angle increases.
  • the total area of the channels between the ribs increases towards the outer edge of the disc working surface, preferably to the second power of' the radius.
  • the radius increases from the center by two inches the channel area increases by four inches.
  • the inclination of the ribs with respect to the radii increases so that the rate of material feed decreases.
  • the decrease in material velocity is compensated by increased channel area insuring the fact that all channels are filled throughout.
  • the ribs upstream of others of the ribs be provided at a greater spacing between said upstream ribs that the downstream ribs so that the upstream channel will be greater in cross section than its preceding downstream channel thereby providing for a turbulence producing pressure relief on the fiber chips being ground.
  • Each of the ridges or ribs 28, as best seen in FIG. 2 is formed with an inclined sidewall 33 terminating in a rounded fillet 34 between the inclined rib sidewall 33 and the channel bottom, on the side of the rib closest to the beginning of the working area 25.
  • the opposite rib of sidewall 33 is substantially perpendicular to the channel bottom.
  • Dam ribs or ridges 37 are extended between ribs to define the ends of the channels 29 between ribs 15. These dam ridges, are positioned at different spaced points on the grinding plate so that the free length of adjacent channels will be different.
  • Each dam ridge 37 as best seen in FIG. 3 is formed with an inclined wall 38 merging into the channel bottom at rounded fillet 39 on the downstream side of ridge 37.
  • the ribs 15 at the beginning of the working area be of gradually increasing height and bevelled as at 40 to form entry tips on the ribs, thereby implementing the flow of material into the channels 29 between the ribs.
  • the grinding plate segment 10 will as understood by those skilled in the art be assembled with a plurality of like segments to form a disc which is mounted in opposition to a similar disc, as set forth by way of example in U.S. Pat. No. 2,035,994 so that wood chips or the like fibrous material will be broken down into its fibrous constituents when the material moves outwardly from the center between the relatively moving discs.
  • a wood chip or the like fibrous material M as seen in FIG. 4 moves into the working area 25 of FIG. l, entering channels 29 between the gradually increasing in height entry end of ribs l having bevelled entry tips 40 (see lower left of FIG. 1).
  • the chips M are pushed along the channel by the action of the channels on the opposed grinding disc.
  • ribs 15 exert a pushing force on chip M at an angle to the desired direction of movement of the chip in the channel which is not perpendicular to the desire direction of movement, as is illustrated in FIG. S, but is preferably at an angle of between 15 and 75 to a diameter of M perpendicular to the desired direction of movement of chip M.
  • the chips may roll over the rib edges up filleted inclined walls, thus producing desired crushing without fiber cutting.
  • Agitation of the ground chips, implementing turbulence and fiber separation is provided by feeding the chips from a constrained portion of one channel to a wider channel section.
  • a grinding plate segment comprising: a plate ember having a grinding face on one surface thereof; a plurality of spaced arcuate ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, at a progressively increasing angle as the distance from the working area increases, said angle being between 0 and 60 to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65 and 90 to a radius intercepting the end of the rib at the periphery of the working area of said plate member.
  • each of said ribs is formed with a rounded fillet between the rib sidewall and the channel bottom on the side of said rib closest to the beginning of the working area of said grinding plate.
  • a grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0 and 60 to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65 and 90 to a radius intercepting the end of the rib at the periphery of the working area of said plate member and plurality of dam ridges are fonned at spaced intervals on said plate member between two adjacent ribs.
  • a grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0 and 60j to the radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65 and 90 to a radius intercepting the end of the rib at the periphery of the working area of said plate member, at least one of the channels of the segment being formed with a spacing between the ribs defining said channel of a gradually approaching orientation in a direction towards the outer edge of said segment.
  • a grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0 and 60 to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65 and 90 to a radius intercepting the end of the rib at the periphery of the working area of said plate member, some of the channels downstream of other of said channels in the direction of the flow of material over said segment having greater cross-section than the preceding channels.
  • a grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0 and 60 to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65 and 90 to a radius intercepting the end of the rib at the periphery of the working area of said plate member, at least one of said ribs being formed with entry tips cut at an angle to the direction of flow of material in the channels formed by said ribs.
  • a grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0 and 60 to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65 and 90 to a radius intercepting the end of the rib at the periphery of the working area of said plate member, at least some of said ribs being formed of gradually increasing height at their ends adjacent the beginning of the working area.
  • a method of breaking fibrous material into its fiber constituents comprising the steps of moving the fibrous material along a rigid surface; exerting a pushing force on the brous material at an angle to the desired direction of movement of the fibrous material having a vector resultant in the desired direction of movement, said pushing force being exerted at an angle of between 15 and 75 to a diameter perpendicular to the desired direction of movement of said fibrous material, thereby minimizing the shear force exerted on the fibers of said fibrous material.
  • a method as in claim 11 in which the pushing force on said fibrous material is periodically relieved as the fibrous material is moved over the rigid surface, thus disturbing any equilibrium of said material, and implementing its break down.
  • a grinding disc having a grinding surface formed by spaced arcuate ribs and channels intermediate said ribs, said ribs extending from the beginning of a working area towards the center of said disc at an angle of between 0 and 60 to a radius of said disc and increasing progressively as the distance from the center increases towards the periphery of said disc where said ribs lie at an angle of between 65 and 90 to the radius of said disc, the rate of increase of the angle of said ribs with respect to the disc radius being such as to correspond to the decrease in the rate of feed of material and to the increase in channel area to maintain said channels filled with brous material throughout.

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US59660A 1970-07-30 1970-07-30 Pulp fiberizing grinding plate Expired - Lifetime US3674217A (en)

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US (1) US3674217A (fr)
JP (1) JPS5429601B1 (fr)
CA (1) CA937085A (fr)
DE (1) DE2130503C3 (fr)
FR (1) FR2103814A5 (fr)
GB (1) GB1355971A (fr)
NO (1) NO140276C (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023737A (en) * 1976-03-23 1977-05-17 Westvaco Corporation Spiral groove pattern refiner plates
US4090672A (en) * 1975-08-12 1978-05-23 Alf Societe Anonyme Grinding apparatus
US5373995A (en) * 1993-08-25 1994-12-20 Johansson; Ola M. Vented refiner and venting process
US5439183A (en) * 1993-06-17 1995-08-08 Sunds Defibrator Industries Aktiebolag Refiner segment
US5823453A (en) * 1995-11-14 1998-10-20 J & L Fiber Services, Inc. Refiner disc with curved refiner bars
US5863000A (en) * 1997-07-01 1999-01-26 Durametal Corporation Refiner plate with steam relief pockets
US5893525A (en) * 1997-07-01 1999-04-13 Durametal Corporation Refiner plate with variable pitch
US6276622B1 (en) 1997-09-18 2001-08-21 Valmet Fibertech Ab Refining disc for disc refiners
US20040149844A1 (en) * 2002-04-25 2004-08-05 Peter Antensteiner Refiner plates with logarithmic spiral bars
WO2004110628A1 (fr) * 2003-06-18 2004-12-23 Metso Paper Inc Raffineur
EP1700949A1 (fr) 2005-03-08 2006-09-13 Andritz Inc. Plaques coniques de raffinage à barres en spirale logarithmique
US20120294725A1 (en) * 2010-01-14 2012-11-22 Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. Rotor disk
US20130119173A1 (en) * 2010-01-14 2013-05-16 Erema Engineering Recycling Maschinen Und Anlagen Rotor disk
US9211546B2 (en) 2010-01-14 2015-12-15 Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. Rotor disk
US20160184830A1 (en) * 2013-08-05 2016-06-30 Sharp Kabushiki Kaisha Mill and beverage preparation apparatus including the same
USD914777S1 (en) * 2018-07-09 2021-03-30 Kennametal Inc. Wear resistant centrifuge tile
US20210222364A1 (en) * 2018-06-04 2021-07-22 Valmet Ab Refiner segment
US11090715B2 (en) 2018-10-30 2021-08-17 Shaanxi University Of Science & Technology Method for designing refiner plates with equidistant curved bars
US11446673B2 (en) * 2018-10-30 2022-09-20 Shaanxi University Of Science & Technology Method for designing refiner plates with three-stage radial curved bars

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2394638A1 (fr) * 1977-06-14 1979-01-12 Vyzk Ustav Papieru Celulozy Dispositif pour traiter des suspensions de fibres par action mecanique de lames
DE2825731C3 (de) * 1978-06-12 1981-11-19 Vsesojuznoe naučno-proizvodstvennoe ob"edinenie celljuloznobumažnoj promyšlennosti, Leningrad Zerfaserungsscheibe für eine Scheibenmühle
FR2600089B1 (fr) * 1986-06-17 1989-02-24 Bonpertuis Acieries Procede et dispositif de raffinage de pate a papier
US5181664A (en) * 1992-04-17 1993-01-26 Andritz Sprout-Bauer, Inc. Grinding plate with angled outer bars
US5425508A (en) * 1994-02-17 1995-06-20 Beloit Technologies, Inc. High flow, low intensity plate for disc refiner
JP7335967B2 (ja) 2019-02-06 2023-08-30 アンドリッツ インコーポレーテッド 供給溝を有するリファイナプレートセグメント

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1223497A (en) * 1915-04-17 1917-04-24 Letz Mfg Co Grinding-machine.
US1269762A (en) * 1916-08-29 1918-06-18 Landers Frary & Clark Grinding-disk.
US1556323A (en) * 1925-06-04 1925-10-06 Garza Pablo Gongales Mill disk
US2035994A (en) * 1934-10-03 1936-03-31 Jr Daniel Manson Sutherland Fiber refining and refiner
US2654295A (en) * 1951-05-02 1953-10-06 Sutherland Refiner Corp Refiner apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1223497A (en) * 1915-04-17 1917-04-24 Letz Mfg Co Grinding-machine.
US1269762A (en) * 1916-08-29 1918-06-18 Landers Frary & Clark Grinding-disk.
US1556323A (en) * 1925-06-04 1925-10-06 Garza Pablo Gongales Mill disk
US2035994A (en) * 1934-10-03 1936-03-31 Jr Daniel Manson Sutherland Fiber refining and refiner
US2654295A (en) * 1951-05-02 1953-10-06 Sutherland Refiner Corp Refiner apparatus

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4090672A (en) * 1975-08-12 1978-05-23 Alf Societe Anonyme Grinding apparatus
US4023737A (en) * 1976-03-23 1977-05-17 Westvaco Corporation Spiral groove pattern refiner plates
US5439183A (en) * 1993-06-17 1995-08-08 Sunds Defibrator Industries Aktiebolag Refiner segment
US5373995A (en) * 1993-08-25 1994-12-20 Johansson; Ola M. Vented refiner and venting process
US5823453A (en) * 1995-11-14 1998-10-20 J & L Fiber Services, Inc. Refiner disc with curved refiner bars
US5975438A (en) * 1995-11-14 1999-11-02 J & L Fiber Services Inc. Refiner disc with curved refiner bars
US5893525A (en) * 1997-07-01 1999-04-13 Durametal Corporation Refiner plate with variable pitch
US5863000A (en) * 1997-07-01 1999-01-26 Durametal Corporation Refiner plate with steam relief pockets
US6276622B1 (en) 1997-09-18 2001-08-21 Valmet Fibertech Ab Refining disc for disc refiners
US20040149844A1 (en) * 2002-04-25 2004-08-05 Peter Antensteiner Refiner plates with logarithmic spiral bars
US7712694B2 (en) * 2002-04-25 2010-05-11 Durametal Corporation Disc refiner with plates having logarithmic spiral bars
US20090001204A1 (en) * 2002-04-25 2009-01-01 Peter Antensteiner Disc refiner with plates having logarithmic spiral bars
US7407123B2 (en) 2002-04-25 2008-08-05 Durametal Corporation Refiner plates with logarithmic spiral bars
US7191967B2 (en) 2003-06-18 2007-03-20 Metso Paper, Inc. Refiner
CN100368091C (zh) * 2003-06-18 2008-02-13 美卓纸业公司 精磨机
US20060151648A1 (en) * 2003-06-18 2006-07-13 Petteri Vuorio Refiner
WO2004110628A1 (fr) * 2003-06-18 2004-12-23 Metso Paper Inc Raffineur
JP2006527650A (ja) * 2003-06-18 2006-12-07 メトソ ペーパー インク リファイナー
EP1700949A1 (fr) 2005-03-08 2006-09-13 Andritz Inc. Plaques coniques de raffinage à barres en spirale logarithmique
US9539741B2 (en) * 2010-01-14 2017-01-10 Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. Rotor disk
US20120294725A1 (en) * 2010-01-14 2012-11-22 Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. Rotor disk
US20130119173A1 (en) * 2010-01-14 2013-05-16 Erema Engineering Recycling Maschinen Und Anlagen Rotor disk
US9211546B2 (en) 2010-01-14 2015-12-15 Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. Rotor disk
US20160184830A1 (en) * 2013-08-05 2016-06-30 Sharp Kabushiki Kaisha Mill and beverage preparation apparatus including the same
US10239062B2 (en) * 2013-08-05 2019-03-26 Sharp Kabushiki Kaisha Mill and beverage preparation apparatus including the same
US20210222364A1 (en) * 2018-06-04 2021-07-22 Valmet Ab Refiner segment
US11846069B2 (en) * 2018-06-04 2023-12-19 Valmet Ab Refiner segment
USD914777S1 (en) * 2018-07-09 2021-03-30 Kennametal Inc. Wear resistant centrifuge tile
US11065628B2 (en) 2018-07-09 2021-07-20 Kennametal Inc. Centrifuge tile assembly
US11090715B2 (en) 2018-10-30 2021-08-17 Shaanxi University Of Science & Technology Method for designing refiner plates with equidistant curved bars
US11446673B2 (en) * 2018-10-30 2022-09-20 Shaanxi University Of Science & Technology Method for designing refiner plates with three-stage radial curved bars

Also Published As

Publication number Publication date
JPS5429601B1 (fr) 1979-09-25
DE2130503A1 (de) 1972-02-17
GB1355971A (en) 1974-06-12
CA937085A (en) 1973-11-20
NO140276B (no) 1979-04-23
FR2103814A5 (fr) 1972-04-14
DE2130503C3 (de) 1975-03-20
DE2130503B2 (de) 1974-08-08
NO140276C (no) 1979-08-01

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