EP0807709A1 - Dispositif pour l'épuration d'une suspension fibreuse - Google Patents

Dispositif pour l'épuration d'une suspension fibreuse Download PDF

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Publication number
EP0807709A1
EP0807709A1 EP97104828A EP97104828A EP0807709A1 EP 0807709 A1 EP0807709 A1 EP 0807709A1 EP 97104828 A EP97104828 A EP 97104828A EP 97104828 A EP97104828 A EP 97104828A EP 0807709 A1 EP0807709 A1 EP 0807709A1
Authority
EP
European Patent Office
Prior art keywords
section
cross
sorting
sieve element
inlet side
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
EP97104828A
Other languages
German (de)
English (en)
Other versions
EP0807709B1 (fr
Inventor
Manfred Duchow
Peter Schweiss
Hans Friedrich
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 Paper Fiber and Environmental Solutions GmbH and Co KG
Original Assignee
Voith Sulzer Stoffaufbereitung 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 Sulzer Stoffaufbereitung GmbH filed Critical Voith Sulzer Stoffaufbereitung GmbH
Publication of EP0807709A1 publication Critical patent/EP0807709A1/fr
Application granted granted Critical
Publication of EP0807709B1 publication Critical patent/EP0807709B1/fr
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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • 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
    • D21D5/04—Flat screens
    • 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 invention relates to a device for sorting fibrous suspension according to the preamble of claim 1.
  • sorting devices are used in the pulp and paper industry, in which the fibrous suspension is treated in a kind of wet screening. In most cases, foreign fibers should be retained on a sieve element due to their size and then separated. The fibers can pass through the sorting openings together with some of the water. In principle, such machines are widely known and are often used.
  • the sieve elements can have a cylindrical structure, then they are called sieve baskets, or they can be made essentially flat, that is, as plate sieves.
  • the strips placed on such screens are mostly intended to protect the screen element from wear. They are therefore often made from particularly wear-resistant material, such as hard metal. In addition to the wear-reducing effect, they can also improve the function of the sorting device. Since such a sorting device has at least one clearing element, which is designed, for example, as a wing and is moved relatively close to the sorting element, additional vortices can be generated by the relative movement, which favors the keeping of the sorting opening. In the case of fibrous material containing specks, the interaction of the clearing element and the strip can achieve an entirely desirable dissolution of the specks. In addition, the strips can be attached in such a way that, together with the clearing element, they deflect the substances rejected at the sorting opening in the direction of the outlet from the sorting device.
  • the sorting cross-section means the narrowest cross-section in the sorting opening, which is known to have the sorting characteristic, i.e. the separation limit of such a sieve element is decisively determined.
  • FIG. 1 schematically shows the part of the sorting device that is essential to the invention.
  • the sieve element 1 drawn in section, which contains a number of sorting openings 2.
  • Two different configurations of such sorting openings are shown by way of example, whereby in reality mostly the same holes are used for one and the same screen element.
  • the illustration is chosen so that the inlet side 4 is at the top, that is to say the suspension is to be guided through the sorting openings 2 from top to bottom. In principle, however, any position is possible.
  • Three strip-shaped elevations 5 are drawn on the inlet side 4.
  • a clearing element 3 is moved relative to the sieve element 1.
  • the sieve element 1 is usually permanently installed and the clearing element 3 e.g.
  • the clearing element On its underside 8, which faces the sieve element, the clearing element has different distances from the inlet side 4 of the sieve element 1. In the running direction at the front, the primary distance a is smaller than behind it the secondary distance b.
  • This sensible embodiment of the invention can favor keeping the sorting openings 2 free, since it generates suction pulses.
  • the clearing wing is given a bead-like reinforcement at that point, which is particularly highly stressed.
  • the broaching element 3 Seen in the direction of movement, has the extension c, which in particularly favorable designs is at least 8 times as long as the secondary distance b. This creates an extensive suction zone under the clearing element, which is useful for keeping the sieve free.
  • the sorting openings 2 on the inlet side 4 have an inlet cross-section 6 which is larger than the actual sorting cross-section 7.
  • the sorting cross-section 7 is known to be the narrowest point of a sorting opening and crucially determines the separation characteristic of the device.
  • the somewhat different sorting openings shown on the right have extensions towards the outlet side. This means, known per se, is intended to further reduce the tendency towards constipation.
  • Fig. 2 the device of Fig. 1 is outlined in supervision.
  • the main thing is the arrangement of the sorting openings 2 and the strip-shaped elevations 5.
  • the arrangement and orientation of these strip-shaped elevations relative to the direction of movement of the rotor can be selected so that pushing away the rejected substances on the strips is promoted by the rotor movement.
  • FIG. 3 shows the conditions in the area of the sorting openings 2 schematically but in somewhat more detail.
  • a sorting opening 2 is shown on the left such that the inlet cross section 6 and the sorting cross section 7 are visible.
  • the measure of the height h is indicated with which the strip-shaped elevations 5 protrude above the inlet side 4 of the sieve element 1.
  • the transition from the inlet cross section 6 to the narrower cross section located downstream can, as shown here, take place in a gradual course of the depth t.
  • FIG. 4 shows a practical form of the sorting device, in which the housing and the volume flows are also visible.
  • the suspension S enters the sorting housing 9 through the inlet connection 10.
  • the housing is divided by the sieve element 1 into two unequal chambers.
  • the clearing element 3 in the form of a drivable vane rotor is moved past the sieve element 1 so closely that blockages of the sorting openings 2 are prevented.
  • What is rejected on the sieve element 1 is discharged through the outlet nozzle 11 and the accept that could pass through the sieve through the accept nozzle 12.
  • the embodiment shown here contains a vertical sieve plate in the operating position in the form of the sieve element 1, but other arrangements are possible , e.g.
  • the sieve element 1 be designed as a horizontal plate; it is also conceivable that additional screen elements are present in the same housing. Furthermore, as already mentioned, the invention can also be applied to cylindrical sieve elements. A graphic representation is not necessary for this, since such devices are well known to the person skilled in the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP97104828A 1996-05-18 1997-03-21 Dispositif pour l'épuration d'une suspension fibreuse Expired - Lifetime EP0807709B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620051A DE19620051A1 (de) 1996-05-18 1996-05-18 Vorrichtung zum Sortieren von faserstoffhaltiger Suspension
DE19620051 1996-05-18

Publications (2)

Publication Number Publication Date
EP0807709A1 true EP0807709A1 (fr) 1997-11-19
EP0807709B1 EP0807709B1 (fr) 2001-11-21

Family

ID=7794658

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97104828A Expired - Lifetime EP0807709B1 (fr) 1996-05-18 1997-03-21 Dispositif pour l'épuration d'une suspension fibreuse

Country Status (2)

Country Link
EP (1) EP0807709B1 (fr)
DE (2) DE19620051A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217122A1 (fr) * 2000-12-22 2002-06-26 Voith Paper Patent GmbH Procédé de fabrication de tamis pour l' épuration de pâte à papier

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747653C2 (de) * 1997-10-29 2002-04-25 Voith Paper Patent Gmbh Sieb für Faserstoffsuspensionen
DE102009015405A1 (de) * 2009-03-27 2010-09-30 Voith Patent Gmbh Sieb
DE202012012678U1 (de) * 2012-08-02 2013-08-22 Voith Patent Gmbh Siebvorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276159A (en) * 1980-06-19 1981-06-30 The Black Clawson Company Apparatus for screening paper fiber stock
EP0119345A1 (fr) * 1983-01-21 1984-09-26 The Black Clawson Company Epurateur d'une pâte fibreuse à papier
EP0182688A1 (fr) * 1984-11-12 1986-05-28 E. + M. Lamort Société Anonyme dite: Perfectionnements aux tamis pour épurateurs et à leur mode de fabrication
FR2586720A1 (fr) * 1985-09-05 1987-03-06 Black Clawson Co Appareil de criblage pour pate a papier
US4657636A (en) * 1985-01-28 1987-04-14 Hitoshi Satomi High density pulp screening apparatus
EP0287267A2 (fr) * 1987-04-16 1988-10-19 The Black Clawson Company Platines cylindriques pour épurateurs
DE4324662A1 (de) * 1993-07-22 1995-01-26 Voith Gmbh J M Sieb

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR828473A (fr) * 1937-01-28 1938-05-18 Pressoirs Mabille Perfectionnements aux pressoirs continus ou similaires
DE2226050A1 (de) * 1972-05-29 1973-12-13 Voith Gmbh J M Vorrichtung zum stetigen ausscheiden von grobstoff aus faserstoffaufschwemmungen
DE3010952A1 (de) * 1980-03-21 1981-10-08 J.M. Voith Gmbh, 7920 Heidenheim Scheibensortierer zum reinigen von faserstoffsuspensionen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276159A (en) * 1980-06-19 1981-06-30 The Black Clawson Company Apparatus for screening paper fiber stock
EP0119345A1 (fr) * 1983-01-21 1984-09-26 The Black Clawson Company Epurateur d'une pâte fibreuse à papier
EP0182688A1 (fr) * 1984-11-12 1986-05-28 E. + M. Lamort Société Anonyme dite: Perfectionnements aux tamis pour épurateurs et à leur mode de fabrication
US4657636A (en) * 1985-01-28 1987-04-14 Hitoshi Satomi High density pulp screening apparatus
FR2586720A1 (fr) * 1985-09-05 1987-03-06 Black Clawson Co Appareil de criblage pour pate a papier
EP0287267A2 (fr) * 1987-04-16 1988-10-19 The Black Clawson Company Platines cylindriques pour épurateurs
DE4324662A1 (de) * 1993-07-22 1995-01-26 Voith Gmbh J M Sieb

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217122A1 (fr) * 2000-12-22 2002-06-26 Voith Paper Patent GmbH Procédé de fabrication de tamis pour l' épuration de pâte à papier
US6905032B2 (en) 2000-12-22 2005-06-14 Voith Paper Patent Gmbh Screens for fibrous paper suspensions and process for making same

Also Published As

Publication number Publication date
DE59705439D1 (de) 2002-01-03
DE19620051A1 (de) 1997-11-20
EP0807709B1 (fr) 2001-11-21

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