EP0286535A1 - Siebe für Papierstoffreiniger - Google Patents

Siebe für Papierstoffreiniger Download PDF

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Publication number
EP0286535A1
EP0286535A1 EP88400827A EP88400827A EP0286535A1 EP 0286535 A1 EP0286535 A1 EP 0286535A1 EP 88400827 A EP88400827 A EP 88400827A EP 88400827 A EP88400827 A EP 88400827A EP 0286535 A1 EP0286535 A1 EP 0286535A1
Authority
EP
European Patent Office
Prior art keywords
perforation
obstacle
plane
fin
obstacles
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
EP88400827A
Other languages
English (en)
French (fr)
Other versions
EP0286535B1 (de
Inventor
Jean-Pierre Lamort
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.)
E ET M LAMORT
Kadant Lamort SAS
Original Assignee
E&M Lamort Fils SA
E ET M LAMORT
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 E&M Lamort Fils SA, E ET M LAMORT filed Critical E&M Lamort Fils SA
Publication of EP0286535A1 publication Critical patent/EP0286535A1/de
Application granted granted Critical
Publication of EP0286535B1 publication Critical patent/EP0286535B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 is an improvement to sieves with holes or slits for the purification of paper pulp and to separators or purifiers provided with such sieves.
  • each of these factors acts in fact on the fluidization of the dough on the upstream surface of the sieve and on the resistance to the passage of the fibers, and very often the improvement of one of the sieving factors (for example flow rate) is achieved to the detriment another factor (for example the resistance to the passage of fibers causes a variation in the concentration).
  • one of the sieving factors for example flow rate
  • another factor for example the resistance to the passage of fibers causes a variation in the concentration
  • the sieves which have an obstacle in the vicinity of each perforation whether they are produced by juxtaposition of bars with downstream heel or by sheet metal machining, have, with respect to the sieves with obstacle distant from the perforation (s), higher sieved throughput and reduced thickening of the outgoing dough, but to the detriment of the sieving quality which decreases.
  • the present invention has for its object a sieve which increases the fluidization of the dough at its upstream surface and which reduces the resistance to the passage of the fibers.
  • the subject of the invention is a sieving device for a purifier or separator, in particular for a paper pulp purifier, comprising a perforated surface, the perforations being of general axis substantially perpendicular to said surface, of the type slots or calibrated holes, at least a hydrodynamic profile fin circulating at high speed in front of the perforated surface intended to entrain the moving dough and to unclog the perforations, said surface being provided with obstacles on the side which looks at the fin in order to create turbulence in the movement of the dough, characterized in that the part of the obstacle closest to the fin, has a plane face parallel to the plane of the perforated surface and the obstacles protrude into the perforations so that each perforation is partially covered by the end of the obstacle.
  • the invention is also remarkable for the following characteristics: - the lower part of the obstacle is raised relative to the opposite edge of the perforation so that in vertical transverse section the plane of entry into the access area to the perforation makes with the horizontal an angle of greater value at 0 ° and less than or equal to 90 °. - the end of the obstacle is overhanging the opposite edge of the perforation in order to cover the entry section of the perforation so that in vertical transverse section the entry plane of the access area to the perforation an angle ⁇ greater than 90 ° passes with the horizontal. - the height of the obstacle is of the order of a few tenths of a millimeter between 0.2 and 1 mm. - The width of the entry section of the perforation is between 0.1 and 1 millimeter.
  • the sieve thus formed produces turbulence in a very small volume, of the order of mm 3 and presents the entry of the perforations normally in the direction of the turbulent current, which promotes the circulation of the dough in the perforations.
  • This sieve provides the following advantages: - increase in purification capacity (input pulp flow), - improvement of the quality of treatment with the same capacities: treatment is finer, - decrease in the refusal rate with . reduced thickening factor: the dry matter concentration at the outlet varies little, and the thickening of the rejected dough part is low. . reduced long fiber reject content . increased contaminant rejection concentration,
  • this sieve makes it possible to reduce the number of purification stages and the water consumption necessary for diluting the refusals usually thickened at the outlet of the purifier.
  • the sieving device illustrated in the figures comprises on the one hand: - A sieve consisting of a metal surface 1 having perforations 2. These are slots or holes which have, in cross section, according to the known technique, from one side 13 to the other 14 of the surface 1 , a first narrow part 2a, with parallel walls 2d, of axis generally perpendicular to the surface of the sieve, and of inlet section 2c parallel to the surface of the sieve, followed by a second part which widens towards the outlet , forming a trapezoidal section 2b.
  • this second part 2b is a truncated cone; on the other hand : - A hydrodynamic profile fin or foil which circulates at high speed in front of the face 13 of the screen, parallel to this face, in the direction indicated by the arrow in the figures.
  • the movement of the fin 3 is communicated to the dough, which circulates along the surface of the sieve, and the good dough progressively crosses the perforations from the side 13 upstream, to the side 14 downstream.
  • the upstream face 13 of the screen has obstacles 4 intended to break the component of the speed parallel to the speed of the liquid.
  • the obstacles 4 are arranged in front of each perforation 12 in order to cause turbulence in the flow of the liquid for each perforation. These obstacles 4 often have varied profiles, but in general they have a general parallelpipedic or trapezoidal shape.
  • This arrangement is to promote the formation of turbulence applied around the end of the obstacle and to guide the flow directly into the perforation 2.
  • the height 5 of the obstacle is of the same order of magnitude as the width of the perforation (diameter in the case of holes), that is to say a few tenths of a millimeter.
  • the height of the obstacle within the meaning of the invention is the distance between the plane 15 defined by the surface 1 of the screen and the face 12 parallel to said plane.
  • the height of the obstacle is between 0.2 and 1 millimeter
  • the width of the inlet section 2c of the perforation is between 0.1 and 1 millimeter, both of which may vary. independently. This characteristic combined with these orders of magnitude indeed seems to favor the formation of turbulence developing in the volume determined by the height of the obstacle and the perforation section, that is to say in a very small volume.
  • Such sieves can be produced by machining the perforated sheet, the obstacle 4 being integrated into the mass of the sieve, the upper profile of the obstacle being obtained by milling, the perforation being obtained in a second step.
  • They can also be produced by assembling bars 6 on crosspieces 7, with or without juxtaposition of said bars against each other, this embodiment making it possible to use various bar profiles.
  • the obstacle has a projecting downstream end 4a which projects into the section 2c itself.
  • the section 2c in this case is slightly reduced by the projecting part 4a.
  • the obstacle comprises an overhanging downstream part 4a which rises above the inlet section 2c of the perforation, and comes to partially cover it, thus forming a baffle of entry in front of the perforation, called zone 8 of access to the perforation.
  • the lower part 9 of the obstacle is raised relative to the base surface of the screen, that is to say relative to the opposite edge 10 of the perforation so that the entry plane 11 into the area d 'access is inclined to the horizontal by an angle ⁇ between 0 and 90 °.
  • the obstacle 4 completely covers the perforation 2: it overhangs at least slightly the opposite edge 10 of the perforation; in this variant, the baffle thus formed has an entry plane inclined relative to the horizontal at an angle ⁇ greater than 90 °.
  • the shape of the end 4a can vary and have a more or less angular outline, or even rounded, as illustrated in FIGS. 5 and 6; therefore, it is not always possible to measure the precise inclination of the entry plane 11 in the access area.
  • the plane 16 tangent to the end 4a of the obstacle 4 and perpendicular to the entry section 2c that is to say to the plane 15: - In the first and second variants, passes into the entry section 2c of perforation 2; - In the third variant, overhang in FIG. 3, passes beyond the inlet section 2c of the perforation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Filtration Of Liquid (AREA)
EP88400827A 1987-04-06 1988-04-06 Siebe für Papierstoffreiniger Expired - Lifetime EP0286535B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8704833 1987-04-06
FR8704833A FR2613389A1 (fr) 1987-04-06 1987-04-06 Perfectionnement aux tamis pour epurateurs de pate a papier

Publications (2)

Publication Number Publication Date
EP0286535A1 true EP0286535A1 (de) 1988-10-12
EP0286535B1 EP0286535B1 (de) 1991-05-29

Family

ID=9349852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400827A Expired - Lifetime EP0286535B1 (de) 1987-04-06 1988-04-06 Siebe für Papierstoffreiniger

Country Status (7)

Country Link
US (1) US4898665A (de)
EP (1) EP0286535B1 (de)
JP (1) JPS63249793A (de)
DE (1) DE3862986D1 (de)
ES (1) ES2023500B3 (de)
FI (1) FI92339C (de)
FR (1) FR2613389A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635125A1 (fr) * 1988-08-08 1990-02-09 Lamort E & M Perfectionnement aux tamis pour epurateurs de pate a papier
WO1991008338A1 (de) * 1989-12-06 1991-06-13 Hermann Finckh Maschinenfabrik Gmbh & Co. Sieb für drucksortierer für fasersuspensionen
EP1039021A1 (de) * 1999-03-25 2000-09-27 Voith Sulzer Papiertechnik Patent GmbH Verfahren zum Nasssieben von Faserstoffsuspensionen in Drucksortierern und Drucksortierersieb

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5791495A (en) * 1996-03-11 1998-08-11 Beloit Technologies, Inc. Paper pulp screen cylinder
FI118810B (fi) * 2003-09-01 2008-03-31 Anpap Oy Sihtirakenne käytettäväksi kuitutuotteen valmistuksessa
JP4376151B2 (ja) * 2004-08-09 2009-12-02 相川鉄工株式会社 スクリーン装置
US8381916B2 (en) * 2005-05-26 2013-02-26 Paul W. Bossen Rotary aggregate washing and classification system
CN104338675A (zh) * 2014-10-30 2015-02-11 安徽捷迅光电技术有限公司 椭圆形物料的分选装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939065A (en) * 1972-08-31 1976-02-17 Ahlfors S E E Screening device
GB2067911A (en) * 1980-01-28 1981-08-05 Celleco Ab Strainer for purification of pulp

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR629799A (fr) * 1926-07-20 1927-11-17 Perfectionnement aux installations de lavage de minéraux au moyen de courants liquidds dans les couloirs à poches d'évacuation
US2038931A (en) * 1934-04-21 1936-04-28 Louis B Goldberg Self cleaning screen for placer mining machines
US2827169A (en) * 1954-12-07 1958-03-18 Internat Pulp Products Inc Screen plate
FR1539846A (fr) * 1967-08-02 1968-09-20 E Et M Lamort Fils Ets Perfectionnement aux épurateurs notamment pour les pâtes à papier
JPS5637393A (en) * 1979-08-30 1981-04-11 Mitsubishi Heavy Ind Ltd Screen apparatus for paper stock
DE3023746C2 (de) * 1980-06-25 1986-04-10 Ruhrkohle Ag, 4300 Essen Fester Siebrost für Aufbereitungsanlagen, insbesondere für Verladungen von Steinkohle
CH649112A5 (de) * 1980-10-03 1985-04-30 Escher Wyss Gmbh Verfahren zum fraktionieren von aus altpapier gewonnenem faserstoff sowie anlage zur ausfuehrung des verfahrens.
SE8107772L (sv) * 1981-12-23 1983-06-06 Karl Gunnar Malm Silplat samt sett att framstella en dylik
FI67588C (fi) * 1983-01-26 1985-04-10 Ahlstroem Oy Silplaot

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939065A (en) * 1972-08-31 1976-02-17 Ahlfors S E E Screening device
GB2067911A (en) * 1980-01-28 1981-08-05 Celleco Ab Strainer for purification of pulp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635125A1 (fr) * 1988-08-08 1990-02-09 Lamort E & M Perfectionnement aux tamis pour epurateurs de pate a papier
WO1991008338A1 (de) * 1989-12-06 1991-06-13 Hermann Finckh Maschinenfabrik Gmbh & Co. Sieb für drucksortierer für fasersuspensionen
US5259512A (en) * 1989-12-06 1993-11-09 Hermann Finckh Maschinenfabrik Gmbh & Co. Screen for pressure sorters for fiber suspensions
EP1039021A1 (de) * 1999-03-25 2000-09-27 Voith Sulzer Papiertechnik Patent GmbH Verfahren zum Nasssieben von Faserstoffsuspensionen in Drucksortierern und Drucksortierersieb
US6273266B1 (en) 1999-03-25 2001-08-14 Voith Sulzer Papiertechnik Patent Gmbh Process for the wet screening of stock suspensions in pressure graders and pressure graders screen

Also Published As

Publication number Publication date
FI881567L (fi) 1988-10-07
FI881567A0 (fi) 1988-04-05
FI92339C (fi) 1994-10-25
JPS63249793A (ja) 1988-10-17
EP0286535B1 (de) 1991-05-29
FR2613389A1 (fr) 1988-10-07
US4898665A (en) 1990-02-06
DE3862986D1 (de) 1991-07-04
FI92339B (fi) 1994-07-15
ES2023500B3 (es) 1992-01-16

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