EP0286535B1 - Siebe für Papierstoffreiniger - Google Patents

Siebe für Papierstoffreiniger Download PDF

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Publication number
EP0286535B1
EP0286535B1 EP88400827A EP88400827A EP0286535B1 EP 0286535 B1 EP0286535 B1 EP 0286535B1 EP 88400827 A EP88400827 A EP 88400827A EP 88400827 A EP88400827 A EP 88400827A EP 0286535 B1 EP0286535 B1 EP 0286535B1
Authority
EP
European Patent Office
Prior art keywords
perforation
obstacle
section
entry
perforations
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
EP88400827A
Other languages
English (en)
French (fr)
Other versions
EP0286535A1 (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
Original Assignee
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 ET M LAMORT filed Critical E ET M LAMORT
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 sieve thus formed produces turbulence in a very small volume, of the order of mm3 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 makes it possible to reduce the number of purification stages and the water consumption necessary for the dilution of the refusals usually thickened at the outlet of the purifier.
  • 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 a projecting downstream part 4a which rises above the inlet section 2c of the perforation, and partially obscures it, thus forming a entrance baffle in front of the perforation, called zone 8 for 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 obscures 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 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Filtration Of Liquid (AREA)

Claims (5)

1. Siebvorrichtung für Reinigungssvorrichtungen oder Separatoren, insbesondere für Reinigungsvorrichtungen für Papierstoff, bestehend aus einer perforierten Oberfläche, deren Perforationen eine im wesentlichen zu dieser Oberfläche senkrechte Achse aufweisen und in der Art von kalibrierten Spalten oder Löchern ausgebildet sind, wenigstens einer Schaufel mit hydrodynamischem Profil, die mit großer Geschwindigkeit vor der perforierten Oberfläche umläuft und die dazu dient, das Abfließen der Paste zu beschleunigen und ein Verstopfen der Perforationen zu verhindern, wobei die Oberfläche mit Hindernissen versehen ist, um damit Turbulenzen im Abfluß der Paste zu erzeugen, dadurch gekennzeichnet, daß der Teil des Hindernisses, der der Schaufel am nächsten liegt, eine ebene Oberfläche aufweist, die parallel ist zu der Ebene der perforierten Oberfläche, und daß die Hindernisse (4) vollständig oder teilweise die Perforationen dergestalt verbergen, daß jede Perforation (2) vollständig oder teilweise durch das Ende (4a) des Hindernisses (4) bedeckt wird.
2. Sieb für Reiniger nach Anspruch 1, dadurch gekennzeichnet, daß der untere Abschnitt (9) des Hindernisses (4) in Bezug auf den gegenüberliegenden Rand (10) der Perforation dergestalt erhöht ist, daß im vertikalen Querschnitt die Eintrittsfläche (11) in die Eingangszone (8) der Perforation mit der Horizontalen einen Winkel bildet, der zwischen 0° und 90° liegt.
3. Sieb für Reiniger nach Anspruch 1, dadurch gekennzeichnet, daß das Ende (4a) des Hindernisses den gegenüberliegenden Rand (10) der Perforation (2) überragt, um damit den Eintrittsabschnitt (2c) der Perforation dergestalt zu verschließen, daß im vertikalen Querschnitt die Eintrittsfläche (11) des Eingangsbereiches (8) der Perforation mit der Horizontalen einen Winkel α bildet, der größer ist als 90°.
4. Sieb nach einem Beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Höhe (5) des Hindernisses (4) zwischen 0,2 und 1 mm liegt.
5. Sieb nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Breite des Eingangsabschnitts (2c) der Perforation zwischen 0,1 und 1 mm beträgt.
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 EP0286535A1 (de) 1988-10-12
EP0286535B1 true 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)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635125B1 (fr) * 1988-08-08 1995-08-11 Lamort E & M Perfectionnement aux tamis pour epurateurs de pate a papier
DE3940334A1 (de) * 1989-12-06 1991-06-13 Finckh Maschf Sieb fuer drucksortierer fuer fasersuspensionen
US5791495A (en) * 1996-03-11 1998-08-11 Beloit Technologies, Inc. Paper pulp screen cylinder
ATE264940T1 (de) 1999-03-25 2004-05-15 Voith Paper Patent Gmbh Verfahren zum nasssieben von faserstoffsuspensionen in drucksortierern und drucksortierersieb
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

Family Cites Families (11)

* 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
SE374148B (de) * 1972-08-31 1975-02-24 S E E Ahlfors
JPS5637393A (en) * 1979-08-30 1981-04-11 Mitsubishi Heavy Ind Ltd Screen apparatus for paper stock
SE427124B (sv) * 1980-01-28 1983-03-07 Celleco Ab Anordning for silning av fibermassasuspensioner
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.
SE428134B (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

Also Published As

Publication number Publication date
FI92339C (fi) 1994-10-25
EP0286535A1 (de) 1988-10-12
FI881567A0 (fi) 1988-04-05
FI92339B (fi) 1994-07-15
FR2613389A1 (fr) 1988-10-07
ES2023500B3 (es) 1992-01-16
FI881567L (fi) 1988-10-07
DE3862986D1 (de) 1991-07-04
US4898665A (en) 1990-02-06
JPS63249793A (ja) 1988-10-17

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