EP1895046A1 - Dépulpeuse dotée d'une plaque perforée avec un maximum de bords de défibrage - Google Patents

Dépulpeuse dotée d'une plaque perforée avec un maximum de bords de défibrage Download PDF

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Publication number
EP1895046A1
EP1895046A1 EP07015571A EP07015571A EP1895046A1 EP 1895046 A1 EP1895046 A1 EP 1895046A1 EP 07015571 A EP07015571 A EP 07015571A EP 07015571 A EP07015571 A EP 07015571A EP 1895046 A1 EP1895046 A1 EP 1895046A1
Authority
EP
European Patent Office
Prior art keywords
grooves
screen plate
recesses
screening machine
plate
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
EP07015571A
Other languages
German (de)
English (en)
Other versions
EP1895046B1 (fr
Inventor
Michael Piper
Robert J. Matz
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to PL07015571T priority Critical patent/PL1895046T3/pl
Publication of EP1895046A1 publication Critical patent/EP1895046A1/fr
Application granted granted Critical
Publication of EP1895046B1 publication Critical patent/EP1895046B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the present invention relates to pulpers for a pulp suspension and in particular pulper with a screen plate for the separation of accepts and overflow.
  • a pulper is used for the processing of fiber raw materials, which are to be used in the form of a pulp suspension in a paper machine.
  • fiber raw materials for example, fresh fibers (primary pulp) or waste paper fibers (secondary pulp) can be considered.
  • the pulper and subsequent apparatuses comminute the fiber furnish into single fibers which are used in the pulp suspension in a paper machine.
  • a pulper which has a perforated plate / screen plate and a rotor which is arranged in a container.
  • perforated plate / sieve plate is referred to here as a sieve plate.
  • the rotor causes a circulation of the pulp source down to the screen plate.
  • the accept passes through a plurality of holes in the screen plate to be further processed, while undesirable substances such as foreign matter, etc. are retained by the holes of the screen plate and can be discharged. Not yet sufficiently dissolved pulp is also retained and further crushed / dissolved.
  • a screen plate is usually a perforated screen plate or provided with otherwise profiled holes or slots.
  • the surfaces of the screen plate may have a planar design or have various overshoots such as bars, bars, etc. These fixed elevations work in conjunction with the leading edges of the rotating rotor blades and crush specks / fiber bundles and other uncorrugated aggregates in the suspension.
  • Bars and bars on a screen plate have the disadvantage that they reduce the available Siebsutz type, so they are provided in a limited amount, so as to maintain the necessary open screen area and the required Sieb trimgangs illness.
  • Certain methods, e.g. Welding to attach the strips and bars requires high temperatures, resulting in surface distortion and warpage of the screen plate, and then requires additional work processes to restore sufficient sheet flatness.
  • a screen plate may have holes formed directly in the screen plate, or the holes may be formed by inserts inserted into corresponding openings of the screen plate. These inserts can be releasably or permanently attached to the base plate of the screen plate, for example by arc welding. The inserts may extend beyond the plane of the base plate so that the overhanging edges of the inserts exert a shearing action on the pulp suspension.
  • An example of a screen plate with inserts that protrude beyond the plane of the base plate is in U.S. Patent No. 6,254,729 (Doelle et al. ) disclosed.
  • inserts as described above are typically formed as short tube sections which are inserted into the corresponding circular holes formed in the base plate.
  • the exposed edges of the inserts thus form a rounded leading edge that limits the amount of shear applied to the pulp suspension.
  • the manufacturing cost of the screen plate by the time required for the metallurgical connection, such as welding increases the inserts with the base plate.
  • the present invention provides a screen plate for a pulper in which a series of intersecting grooves defines a crisscross pattern of peaks ("mountains”) and valleys ("valleys”), with a hole formed in each mountain and valley.
  • the raised blocks which are defined by the elevations, each have side edges that provide maximum Kantenaufschlags vom depending on the direction of rotation of the rotor in interaction with the leading edges of the rotor blades.
  • the invention in one embodiment includes a screening machine for a pulp suspension with a container; a rotor disposed in the container; and a screen plate disposed near the rotor.
  • the screen plate includes a plurality of substantially parallel first grooves extending in a first direction and a plurality of substantially parallel second grooves extending in a second direction.
  • the first grooves intersect with the second grooves.
  • the first grooves and the second grooves define in cooperation a plurality of projections and depressions.
  • a variety of surveys and a variety of wells include a through hole that extends through the screen plate.
  • the invention in another embodiment, includes a screen plate for use in a screening machine.
  • the screen plate contains a base plate with a work surface.
  • the work surface includes a plurality of substantially parallel first grooves extending in a first direction and a plurality of substantially parallel second grooves extending in a second direction.
  • the first grooves intersect with the second grooves and the first and second grooves define together a plurality of protrusions and depressions.
  • a plurality of the protrusions and a plurality of recesses include a through hole extending through the screen plate.
  • the invention includes a method of manufacturing a screen plate for use in a screening machine, comprising the steps of: forming a plurality of substantially parallel first grooves in a first direction in a base plate; Forming a plurality of substantially parallel second grooves in a second direction of travel in said base plate, said first grooves intersecting said second grooves, said first and second grooves together forming a plurality of peaks and valleys; and forming a plurality of through-holes through the screen plate, wherein each through-hole may be positioned in one of these protrusions or depressions.
  • An advantage of the present invention is that the criss-cross pattern of the peaks and valleys ensures a maximum supply of impact edges between the rotor blades and the screen plate surface profile.
  • the screen plate has a maximum available edge impact surface profile without reducing the available open screen passage area.
  • a Flat screen 10 of the present invention which generally includes a container 12, a rotor 14 and a screen plate 16.
  • the rotor 14 is located in the vicinity of the screen plate 16, so that in operation an intended interaction of the rotor 14 and screen plate 16 takes place.
  • the flat screen machine 10 is a pulper.
  • the flat screen machine 10 may be a machine of any other type used for processing fibers, pulps, or a pulp suspension, such as a fiber sorter or a secondary pulper.
  • the container 12 may have any suitable shape, for example, closed at the top or open at the top.
  • FIG. 1 shows only one wall of the container 12.
  • the rotor 14 is arranged in the container 12 and has a generally circular cross-section in the plan view.
  • clockwise i.e., clockwise viewed from above
  • a portion of the rotor 14 moves, from right to left, as indicated by arrow 18.
  • the section which adjoins the illustrated side wall of the container 12 moves towards the viewer of FIG.
  • the rotor 14 is shown for ease of illustration with a smooth bottom surface 20, but sometimes has a profiled surface or protruding from the lower surface 20 projections that support the formation of a circumferential flow of the pulp suspension between the rotor 14 and screen plate 16.
  • the screen plate 16 is arranged stationarily in the container 12. It includes a base plate 22 which has a working surface 24 on one side opposite to the rotor 14.
  • the work surface 24 includes a plurality of substantially parallel first grooves 26 extending in a first direction 28 and a plurality of substantially parallel second grooves 30 extending in a second direction 32.
  • the First grooves 26 intersect with the second grooves 30 and define a cross pattern of grooves.
  • the first grooves 26 and second grooves 30 cooperatively define a plurality of ridges 34 and recesses 36.
  • the first grooves 26 and second grooves 30 generally intersect at right angles but may also intersect at a different angle. whereby the elevations 34 and depressions 36 assume a different shape frontally.
  • the elevations 34 may in particular have a square, a rectangular or a rhombic shape.
  • the screen plate 16 of a screening machine is composed of a number (e.g., 4, 6, 8 or 12) ring segments. These are generally equal to one another, so that when installed, the grooves 26 of adjacent ring segments are not parallel at the segment boundaries.
  • each protrusion 34 is provided with a centrally located through hole 38 and each recess 36 is provided with a centrally located through hole 38.
  • each protrusion 34 and / or depressions 36 include a through hole 38.
  • the through-holes 38 in the respective elevations 34 or depressions 36 need not be arranged centrally.
  • Each bump 34 includes a plurality of fiberizing edges 40, each representing a straight edge in the illustrated embodiment. Which of the edges is used as a leading edge, ie defibering edge, depends on the direction of rotation of the rotor 14.
  • Defibering edges 40 are generally sharp edges, which in the pulp suspension is a maximum Shear action on the medium to exercise.
  • a plurality of adjacent sidewalls 42 extend between ridges 34 and recesses 36 generally at right angles to a corresponding ridge 34.
  • the sidewalls 42 could also be positioned slightly acute angled to a corresponding ridge 34 to provide a slight undercut and an even sharper rippling edge ,
  • all elevations 34 lie in a common plane and all depressions 36 in another common plane.
  • the elevations extend approximately 2.5 to 5 mm above the depressions 36 and preferably approximately 3 to 4 mm above the depressions 36.
  • the base plate 22 has a total thickness of approximately 22 mm (from the rear side to the elevations 34). and a thickness of about 20 mm from the back to the recesses 36.
  • the protrusions 34 and recesses 36 each have a generally square shape in the dimensions of about 20 x 20 mm.
  • the multiplicity of substantially parallel first grooves 26 are introduced into the base plate 22 in a first direction of progression.
  • the plurality of substantially parallel second grooves 30 are inserted into the base plate 22 in a second direction of travel 32, wherein the first grooves 26 intersect generally at right angles with the second grooves 30.
  • the plurality of through holes 38 are then inserted into the screen plate 22, each through hole 38 being centrally located in the respective bump or recess.
  • the screen plate 16 is particularly suitable for the use of pulpers, in which a high dissolution effect is required. As a rule, this is a discontinuous or continuous pulp solution in which rapid dissolution and / or defibration is brought about by constant material circulation and shear forces becomes. This effectively reduces defibration / dissolution times and results in significant energy savings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP07015571A 2006-08-30 2007-08-08 Dépulpeuse dotée d'une plaque perforée avec un maximum de bords de défibrage Not-in-force EP1895046B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07015571T PL1895046T3 (pl) 2006-08-30 2007-08-08 Aparat do rozpuszczania zawiesiny z płytą sitową i z maksymalnymi krawędziami rozwłókniającymi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/512,852 US7987991B2 (en) 2006-08-30 2006-08-30 Pulper with screen plate having maximum defibering edges

Publications (2)

Publication Number Publication Date
EP1895046A1 true EP1895046A1 (fr) 2008-03-05
EP1895046B1 EP1895046B1 (fr) 2011-01-05

Family

ID=38739404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07015571A Not-in-force EP1895046B1 (fr) 2006-08-30 2007-08-08 Dépulpeuse dotée d'une plaque perforée avec un maximum de bords de défibrage

Country Status (6)

Country Link
US (1) US7987991B2 (fr)
EP (1) EP1895046B1 (fr)
CN (1) CN101135121B (fr)
AT (1) ATE494420T1 (fr)
DE (1) DE502007006160D1 (fr)
PL (1) PL1895046T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152882A1 (fr) * 2008-06-18 2009-12-23 Voith Patent Gmbh Dispositif de désagrégation de matière
EP3023541A1 (fr) * 2014-11-21 2016-05-25 Aikawa Iron Works Co., Ltd. Tamis pour la fabrication du papier, appareil de séparation de matériau étranger pour fabrication de papier et procédé de fabrication d'un tamis pour la fabrication du papier

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8192436B2 (en) 2007-12-07 2012-06-05 Baxano, Inc. Tissue modification devices
JP6460741B2 (ja) * 2014-08-06 2019-01-30 相川鉄工株式会社 製紙用ストレーナ及び製紙用異物分離装置
JP6876210B2 (ja) * 2016-12-29 2021-05-26 デュプロ精工株式会社 再生パルプ製造装置および古紙再生処理装置
CN113680116A (zh) * 2021-09-01 2021-11-23 安德里茨（中国）有限公司 筛板及筛浆机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB659111A (en) * 1949-03-23 1951-10-17 Douglas Fraser An improved machine for disintegrating paper mill waste, straw and the like
US3150038A (en) * 1962-09-21 1964-09-22 Improved Machinery Inc Continuous pulping apparatus
WO1990010110A1 (fr) * 1989-03-02 1990-09-07 A. Ahlstrom Corporation Methode et appareil pour l'epaississement d'une suspension de fibres
EP0479203A1 (fr) * 1990-10-01 1992-04-08 Aikawa Iron Works Co., Ltd. Pulpeur pour la fabrication du papier
WO1998049392A1 (fr) * 1995-11-08 1998-11-05 Ab Knutsilplätar Barriere d'essorage de suspensions fibreuses

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3006364B1 (de) * 1980-02-20 1980-11-13 Steinhaus Gmbh Lochplatten-Siebboden mit Selbstreinigungswirkung
US5064537A (en) * 1987-04-16 1991-11-12 The Black Clawson Company Seamless screen cylinder with laser cut openings
US4832834A (en) * 1988-07-11 1989-05-23 Baird Jr Howard R Elastomer sieve screen
FR2707677B1 (fr) * 1993-07-13 1995-08-25 Technogenia Plaque de défibrage ou de raffinage de pâte à papier, et procédé pour sa réalisation.
US5798025A (en) * 1997-03-13 1998-08-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for screening waste paper pulp
US6254729B1 (en) * 1999-03-22 2001-07-03 Voith Sulzer Paper Technology North America, Inc. Pulper with extraction plate assembly having removable inserts and method of manufacturing same
US6571957B1 (en) * 2000-08-07 2003-06-03 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB659111A (en) * 1949-03-23 1951-10-17 Douglas Fraser An improved machine for disintegrating paper mill waste, straw and the like
US3150038A (en) * 1962-09-21 1964-09-22 Improved Machinery Inc Continuous pulping apparatus
WO1990010110A1 (fr) * 1989-03-02 1990-09-07 A. Ahlstrom Corporation Methode et appareil pour l'epaississement d'une suspension de fibres
EP0479203A1 (fr) * 1990-10-01 1992-04-08 Aikawa Iron Works Co., Ltd. Pulpeur pour la fabrication du papier
WO1998049392A1 (fr) * 1995-11-08 1998-11-05 Ab Knutsilplätar Barriere d'essorage de suspensions fibreuses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152882A1 (fr) * 2008-06-18 2009-12-23 Voith Patent Gmbh Dispositif de désagrégation de matière
DE102008029043A1 (de) * 2008-06-18 2009-12-24 Voith Patent Gmbh Stoffauflöser
EP3023541A1 (fr) * 2014-11-21 2016-05-25 Aikawa Iron Works Co., Ltd. Tamis pour la fabrication du papier, appareil de séparation de matériau étranger pour fabrication de papier et procédé de fabrication d'un tamis pour la fabrication du papier

Also Published As

Publication number Publication date
EP1895046B1 (fr) 2011-01-05
CN101135121A (zh) 2008-03-05
CN101135121B (zh) 2011-09-14
ATE494420T1 (de) 2011-01-15
DE502007006160D1 (de) 2011-02-17
PL1895046T3 (pl) 2011-05-31
US20080053874A1 (en) 2008-03-06
US7987991B2 (en) 2011-08-02

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