EP1096063B1 - Procédé et dispositif de fractionnement d'une suspension de fibres à papier - Google Patents

Procédé et dispositif de fractionnement d'une suspension de fibres à papier Download PDF

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Publication number
EP1096063B1
EP1096063B1 EP00121414A EP00121414A EP1096063B1 EP 1096063 B1 EP1096063 B1 EP 1096063B1 EP 00121414 A EP00121414 A EP 00121414A EP 00121414 A EP00121414 A EP 00121414A EP 1096063 B1 EP1096063 B1 EP 1096063B1
Authority
EP
European Patent Office
Prior art keywords
wire
clearer
sieve
sweeper
suspension
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.)
Revoked
Application number
EP00121414A
Other languages
German (de)
English (en)
Other versions
EP1096063A1 (fr
Inventor
Samuel Dr. Schabel
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 Paper Patent GmbH
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Filing date
Publication date
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1096063A1 publication Critical patent/EP1096063A1/fr
Application granted granted Critical
Publication of EP1096063B1 publication Critical patent/EP1096063B1/fr
Anticipated expiration legal-status Critical
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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

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a fractionation device according to the preamble of claim 8.
  • aqueous paper fiber suspensions by wet sieving can be fractionated.
  • sorting i.e. the removal of unwanted components from the paper fiber suspension
  • Fiber fractionation i.e. division of the paper fibers themselves into several fractions.
  • Fiber fractionation certain Properties of paper fibers, e.g. Length, thickness or flexibility as Separation characteristic used.
  • Such a process enables extraction of fiber materials with special properties from fiber mixtures such as Waste paper.
  • native raw materials can also be fractionated according to their fiber properties become.
  • a concentration of the Long fibers in the overflow of the sieve and a concentration of the short fibers in the Pass of the sieve reached. So far there have been processes for fiber fractionation Selectivity and / or throughput are inadequate in many cases.
  • the devices used for sorting on the one hand and for fiber fractionation on the other hand are very similar in structure. As is known, almost always a screen clearer moves close to the screen to clear the blockage to prevent the sieve and thereby enable a large sieve throughput.
  • a sorting device i.e. Separate unwanted components a fiber suspension is described in EP-A-0 299 258.
  • Throughput To be able to increase, it is proposed that the surface of the screen clearer with webs provided due to their size and shape, e.g. inclined side surfaces, suction and Generate pressure pulses. These are intended in particular in cooperation with grooved Seven improve their freedom.
  • the invention is based on the object of creating a method with which it succeeds in achieving a greater separation effect when fractionating - even from problematic ones Components such as Long fibers and stickies - to achieve.
  • the inventive method leads to a Drag flow at the scraper, which is essentially parallel to the screen surface Moves circumferentially.
  • the fibers in the suspension are therefore evenly oriented and the separation based on their length and / or their Flexibility is possible with a better effect. This is especially true for across Sorting columns aligned in parallel flow. Keeping the sieve openings clear is due to the surface structure of the sieve in cooperation with the Drag flow caused micro vortices and / or small-scale turbulence reached.
  • the gentle sieve clearance according to the invention is cheaper.
  • the scraper can be roughened, e.g. with a Be provided with a plurality of grooves. Even a felt placed on the surface can Develop a drag effect.
  • the advantages of the invention are best with such rooms achievable, the surface of which faces the sieve is predominantly continuous, which is not e.g. have a number of foils, wings, or bumps. In other cases it may be useful to find a compromise between the Separation effect and throughput. For technical / physical reasons namely that are often accepted that when generating a pure Parallel flow throughput through the screen is reduced compared to one Prior art methods with high turbulence. It must then be weighed up between the parallel flow which is as rectified as possible or a limited one Generation of vortices. Weak vortices can be created by e.g. a sieve and / or a reamer with profile grooves or strips is used.
  • Fig. 1 the relationships are shown that occur when performing the method in the area of sieve 1, scraper 5 and the paper fiber-containing moving in between Play suspension S.
  • the suspension S is passed through the sieve 1 fractionated by a fraction flowing through the sieve openings 6, while a other part is rejected and ultimately in a designated place the equipment used for the process is removed.
  • the scraper 5 is in Distance A from and relative to sieve 1 in the direction shown by arrow Movement direction 3 moves. Since the surface 8 of the reamer 5 is rough, e.g. like here shown, provided with a number of grooves 7, the suspension is almost dragged along without slip, so that a parallel flow 4 arises. This Parallel flow 4 is not strictly parallel to that facing the suspension Surface of the sieve.
  • the grooves 7 provided to form the rough surface are dimensioned.
  • Their width B at the widest point is advantageously less than 3 mm and theirs Height H at a maximum of 2 mm.
  • other dimensions can also be useful his.
  • this scraper as many as possible to accommodate such grooves, i.e. they have a small distance C at surface 8 from each other. They can be straight parallel, but it is also a diamond or Conceivable wave pattern.
  • the sieve 1 'used according to FIG. 3 has a profile structure on its inlet side:
  • the tops of the sieve bars 12 are opposite to the direction of movement 3
  • Angle a slightly inclined so that it is spatially narrow at the inlet into the sieve openings can form limited micro-vortices. Due to the inclination, protrusions form the sieve columns with the height E. It is also possible to use groove-like depressions with a appropriate depth in the sieve.
  • FIG. 4 shows part of a further sieve with which the method can be carried out.
  • the sieve is provided with a plurality of sieve openings 6, which are designed as narrow slots with a slot width D between 0.1 and 0.4 mm, preferably 0.15 to 0.25 mm.
  • Their longitudinal extent has an angle of attack ⁇ of 100 ° with respect to the direction of movement 3 in the case shown. In general, however, it is 90 °.
  • Fig. 5 shows schematically a fractionation device in a view from above. It contains a housing 13 with a partially drawn cover 14.
  • the sieve 1 is cylindrical Sieve basket, and the reamer 5 is designed as a cylindrical rotor.
  • the rough one Surface 8 is indicated as a thick circular line.
  • the suspension flows through the Inlet 15 between screen 1 and rotor.
  • the sieve pass is through the Fine fraction outlet 16 and the sieve overflow through the coarse fraction outlet 17 dissipated.
  • more than these two fractions can be formed e.g. several fine fractions with the help of differently designed Screen openings.
  • Sieve and rotor are arranged concentrically to each other, but they are other embodiments are also conceivable.
  • Fig. 6 shows a geometric representation of a circular cylindrical rotor trained reamer 5 with substantially axially parallel grooves 7.
  • a shape inserted concentrically in a circular cylindrical sieve, has a very gentle Effect, i.e. generates no significant pressure / suction impulses.
  • pressure / suction pulses are to be generated with Profile strips 18 are provided. These can also generate the Support parallel flow, e.g. with the help of a steep leading edge.
  • the Profile strips 18 have only a small height F (Fig. 8). Your number can too be small, e.g. two to five spread over the circumference.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (11)

  1. Procédé pour le fractionnement d'une suspension contenant des fibres à papier, dans lequel la suspension (S) est divisée par un tamis (1, 1') en au moins deux fractions de fibres, un racleur (5) déplacé par rapport à ce tamis étant utilisé pour la libération du tamis,
    caractérisé en ce que
       à l'aide d'une surface (8) rugueuse du racleur (5), on génère un écoulement parallèle (4) sur le côté arrivée (2) du tamis (1, 1'),
       en utilisant un racleur (5) qui est pourvu sur sa surface (8) d'une pluralité de cavités allongées, de préférence des rainures (7) ou d'une couche feutrée et facilement mouillable, et
       la suspension (5) étant entraínée pratiquement sans glissement par le racleur (5) par le fait qu'elle est déplacée dans la zone de contact s'étendant jusqu'à un millimètre de la surface du racleur (5) à au moins 90% de la vitesse du racleur.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
       le racleur (5) est déplacé le long du côté arrivée (2) du tamis (1, 1') à une distance (A) de 20 mm maximum.
  3. Procédé selon la revendication 1 ou 2,
       caractérisé en ce que
       le racleur (5) est déplacé à une vitesse d'au moins 10 m/s par rapport au tamis (1, 1').
  4. Procédé selon la revendication 3,
       caractérisé en ce que
       le racleur (5) est déplacé à une vitesse d'au moins 20 m/s par rapport au tamis (1, 1').
  5. Procédé selon l'une quelconque des revendications précédentes,
       caractérisé en ce que
       le racleur (5) ne génère pas d'impulsions de pression ou d'aspiration en direction du tamis (1, 1').
  6. Procédé selon l'une des revendications précédentes,
       caractérisé en ce que
       on fractionne avec un tamis (1, 1'), dont les orifices (6) sont allongés, présentant une extension longitudinale qui est située par rapport au sens de déplacement (3) du racleur (5) selon un angle d'attaque (β) compris entre 70° et 110°.
  7. Procédé selon l'une quelconque des revendications précédentes,
       caractérisé en ce que
       on fractionne avec un tamis (1, 1'), sur lequel des tourbillons limités dans l'espace sont générés à l'aide de saillies ou de cavités conjointement avec l'écoulement parallèle (4).
  8. Dispositif pour l'application du procédé selon l'une des revendications précédentes avec un boítier (13), dans lequel se trouve au moins un tamis (1, 1'), le long duquel un racleur (5) peut être déplacé du côté arrivée, afin d'empêcher l'obstruction des orifices (6) du tamis (1, 1'),
       caractérisé en ce que
       le racleur (5) présente une surface (8) fermée et rugueuse qui est formée par une couche de feutre.
  9. Dispositif selon la revendication 8,
       caractérisé en ce que
       le tamis (1') est pourvu de saillies ou de cavités d'une hauteur ou profondeur maximum de 2 mm.
  10. Dispositif selon la revendication 8 ou 9,
       caractérisé en ce que
       le tamis (1, 1') est un tamis cylindrique dans lequel un rotor cylindrique est disposé de façon rotative comme racleur (5).
  11. Dispositif selon la revendication 10,
       caractérisé en ce que
       le panier de tamis et le rotor sont concentriques.
EP00121414A 1999-10-27 2000-09-29 Procédé et dispositif de fractionnement d'une suspension de fibres à papier Revoked EP1096063B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19951711 1999-10-27
DE19951711A DE19951711A1 (de) 1999-10-27 1999-10-27 Verfahren und Vorrichtung zum Fraktionieren einer papierfaserhaltigen Suspension

Publications (2)

Publication Number Publication Date
EP1096063A1 EP1096063A1 (fr) 2001-05-02
EP1096063B1 true EP1096063B1 (fr) 2004-08-11

Family

ID=7927027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00121414A Revoked EP1096063B1 (fr) 1999-10-27 2000-09-29 Procédé et dispositif de fractionnement d'une suspension de fibres à papier

Country Status (5)

Country Link
US (1) US6409023B1 (fr)
EP (1) EP1096063B1 (fr)
AT (1) ATE273415T1 (fr)
CA (1) CA2324338A1 (fr)
DE (2) DE19951711A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007029806A1 (de) 2007-06-27 2009-01-02 Voith Patent Gmbh Verfahren zur Aufbereitung von Altpapier
DE102007029805A1 (de) 2007-06-27 2009-01-02 Voith Patent Gmbh Verfahren zur Erzeugung von mehrlagigem Karton oder Verpackungspapier aus Altpapier
CN114932652B (zh) * 2022-04-11 2024-09-27 青岛天物金佰包装制品有限公司 一种eps泡沫充分熟化的熟化设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411721A (en) * 1966-09-02 1968-11-19 Ingersoll Rand Canada Refining and screening apparatus
FI77279C (fi) * 1987-04-30 1989-02-10 Ahlstroem Oy Foerfarande och anordning foer behandling av fibersuspension.
WO1988010335A1 (fr) * 1987-06-26 1988-12-29 A. Ahlstrom Corporation Appareil pour tamiser la pate de cellulose et procede de tamisage d'une suspension de pate
FI92227C (fi) * 1992-04-23 1994-10-10 Ahlstroem Oy Laite kuitususpension käsittelemiseksi
US5307939A (en) * 1992-07-13 1994-05-03 Ingersoll-Rand Company Screening apparatus for papermaking pulp
US5385240A (en) * 1993-04-30 1995-01-31 The Black Clawson Company Screening apparatus with adjustable hydrofoil portion
DE19836318A1 (de) * 1998-08-11 1999-07-15 Voith Sulzer Papiertech Patent Rotor für Drucksortierer

Also Published As

Publication number Publication date
US6409023B1 (en) 2002-06-25
CA2324338A1 (fr) 2001-04-27
ATE273415T1 (de) 2004-08-15
DE19951711A1 (de) 2001-05-03
EP1096063A1 (fr) 2001-05-02
DE50007359D1 (de) 2004-09-16

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