WO2012119998A2 - Dispositif de tamisage - Google Patents

Dispositif de tamisage Download PDF

Info

Publication number
WO2012119998A2
WO2012119998A2 PCT/EP2012/053772 EP2012053772W WO2012119998A2 WO 2012119998 A2 WO2012119998 A2 WO 2012119998A2 EP 2012053772 W EP2012053772 W EP 2012053772W WO 2012119998 A2 WO2012119998 A2 WO 2012119998A2
Authority
WO
WIPO (PCT)
Prior art keywords
screening device
sieve
screen element
nozzles
screen
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.)
Ceased
Application number
PCT/EP2012/053772
Other languages
German (de)
English (en)
Other versions
WO2012119998A3 (fr
Inventor
Till Huesmann
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
Publication of WO2012119998A2 publication Critical patent/WO2012119998A2/fr
Publication of WO2012119998A3 publication Critical patent/WO2012119998A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • D21D5/06—Rotary screen-drums
    • 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 screening device for treating a suitable for producing a paper, cardboard, tissue or other fibrous web
  • Pulp suspension with a rotationally symmetrical, rotating screen element with screen openings which is guided past at least one nozzle which directs a jet of pulp suspension on the screen element. If a new pulp suspension made of wood or if
  • the fibers generally have very different lengths. It may then be advantageous to separate the short cellulose fibers from long cellulose fibers, especially to be able to produce paper sheets with different qualities.
  • a short fiber fraction which contains predominantly short fibers whose maximum lengths are in the order of one millimeter to one and a half millimeters, and on the other hand a
  • long fiber fraction which mainly contains long fibers whose minimum lengths are of the order of one millimeter to one and a half millimeters.
  • Fiber webs can be used.
  • Pulp suspension to be removed by washing.
  • pulp suspension also extends to fibers containing process or wastewater.
  • the object of the invention is therefore to develop a simple to produce and easy to clean screen element. According to the invention, this object is achieved in that the sieve element is formed as a tissue.
  • the manufacturing cost of the fabric is relatively low, with the large variability in mesh size greatly expanding the range of application of the screening device.
  • the washing of the pulp suspension is possible with such screening devices, wherein the mesh size of the screening element between 100 and 800 ⁇ should preferably be between 300 and 500.
  • the mesh size of the sieve should be less than 100 ⁇ and preferably between 20 and 50 ⁇ lie.
  • the axis of rotation of the screen element is approximately perpendicular. With this arrangement, the fibers or, when fractionating, at least a fraction can be collected at least partially just below the sieve element.
  • the screen element should have a cylindrical shape.
  • the screen element can be made open at the bottom.
  • the nozzles can be arranged inside, but also outside of the sieve element. However, the arrangement offers advantages in terms of
  • At least one collecting trough should be arranged below the sieve element.
  • At least one pressurized fluid nozzle should be arranged outside the screen element in the direction of rotation after a nozzle, which directs a fluid, in particular steam, water or compressed air onto the screen element.
  • a fluid in particular steam, water or compressed air onto the screen element.
  • the fibers released from the fabric then fall into the sump tray.
  • a plurality of nozzles should each direct at least one jet of pulp suspension onto the screen element.
  • the fabric should be designed as a spiral fabric or as a mesh fabric. Although in this case fabric made of metal are preferred, but also plastic fabric can be used.
  • the thread thickness of the tissue should be between 0.25 and 1.5 mm, so that tissue thicknesses between about 0.5 and 3 mm result.
  • the small thickness of the screen element facilitates cleaning through the Druckfluid- nozzles considerably, which is correspondingly positive to the necessary
  • the sieve element is formed by at least two interconnected fabric layers, preferably those facing the nozzles
  • Fabric layer has larger mesh sizes than the other and acts as a supporting fabric layer.
  • the connection between the fabric layers can be done simply over United. In this context, it can also be advantageous if different materials are used for the fabric layers,
  • the rotational speed of the sieve element is in the range between 4 and 16 m / s.
  • Sieve element on the nozzle-facing side has a coarser surface structure than on the opposite side.
  • This coarser structure can be produced with advantage by forming the sieve element of at least two interconnected fabric layers, the fabric layer facing the nozzles having larger mesh sizes than the other and / or by applying profile elements to the sieve element on the side facing the nozzles.
  • the invention will be explained in more detail below with reference to several exemplary embodiments.
  • Figure 1 a schematic representation of a screening device
  • FIG. 2 shows a cross section through the screening device
  • FIG. 3 a mesh fabric
  • Figure 4 a spiral fabric
  • Figure 5 a two-ply fabric.
  • the fractionator according to FIGS. 1 and 2 is formed by a rotating cylindrical sieve element 2.
  • the vertically arranged cylinder jacket consists of a metallic screen mesh.
  • the mesh size is exemplarily between 1, 2 and 2 mm.
  • the downwardly open screen element 2 is driven by an upper
  • nozzles 4 distributed over the circumference, which in each case direct a jet of the pulp suspension 1 against the sieve element 2.
  • the nozzles 4 can direct the beam perpendicular or inclined to the screen openings 3.
  • the short fibers pass easily through the meshes of the fabric, while the long fibers bounce off or hang on the filaments.
  • a drip pan 7 for receiving and transporting away the short fibers and the part of the water through the slits of the pulp suspension.
  • a jet of water on the screen element 2 directed in each case outside the cylindrical screen element 2 in the direction of rotation 9 for a nozzle 4 water nozzles 8 a jet of water on the screen element 2.
  • the thereby detached long fibers are used together with the already bounced during spraying long fibers and the Rest of the water of the pulp suspension 1 is received by a arranged under the cylindrical screen 2 collecting tray 6.
  • the screening device described here can also be used for fiber recovery in process or wastewater or drainage during washing. Essentially, only the screen mesh has to be adapted with regard to the size of its screen openings.
  • the sieve element 2 can be formed as a square mesh fabric as in FIG. 3 or, as in FIG. 4, as a spiral fabric.
  • the mesh is lightweight yet sufficiently stiff. In addition, it can be because of the small thickness and the associated shortness of the
  • FIG. 5 shows in addition a two-ply fabric, the fabric layers 1 1, 12 are connected to each other cohesively (sintered). While the fabric layer 1 1 facing the nozzles 4 is very coarse-meshed, the other fabric layer 12 has substantially smaller screen openings 3.
  • the threads of the coarse mesh layer 1 1 are also much stronger than that of the fine-mesh fabric layer 12. Without the treatment of
  • the coarse-meshed fabric layer 1 1 ensures that the coarse-meshed fabric layer 1 1 ensures that the side of the screen element 2 facing the nozzles 4 has a substantially coarser surface structure than the other side. This rough surface structure supports the entrainment of the applied to the screen element 2
  • Pulp suspension 1 in the direction of rotation 9 the pulp suspension 1 can be accelerated to speeds of 4 to 16 m / s, which leads to the orientation of the fibers in the direction of rotation 9 and the drainage through the
  • the entrainment of the pulp suspension 1 can alternatively or additionally also be supported by elevations extending preferably transversely to the direction of rotation 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un dispositif de tamisage pour le traitement d'une suspension fibreuse (1) appropriée à la production d'une bande de papier, de carton, de papier à usage sanitaire et domestique ou d'une autre bande fibreuse, lequel dispositif comprend un élément de tamisage (2) rotatif, à symétrie de rotation, muni d'ouvertures de tamisage (3) et amené devant au moins une buse (4) qui dirige un jet de suspension fibreuse (1) vers l'élément de tamisage (2). Selon l'invention, la fabrication est simplifiée et la consommation d'énergie est réduite par le fait que l'élément de tamisage (2) est réalisé sous la forme d'un tissu.
PCT/EP2012/053772 2011-03-08 2012-03-06 Dispositif de tamisage Ceased WO2012119998A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011005224.0 2011-03-08
DE201110005224 DE102011005224A1 (de) 2011-03-08 2011-03-08 Siebvorrichtung

Publications (2)

Publication Number Publication Date
WO2012119998A2 true WO2012119998A2 (fr) 2012-09-13
WO2012119998A3 WO2012119998A3 (fr) 2012-11-01

Family

ID=45808933

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/053772 Ceased WO2012119998A2 (fr) 2011-03-08 2012-03-06 Dispositif de tamisage

Country Status (2)

Country Link
DE (1) DE102011005224A1 (fr)
WO (1) WO2012119998A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018073491A1 (fr) * 2016-10-17 2018-04-26 Andritz Oy Ensemble tamis destiné à des lessiveurs de pâte et autres récipients de traitement dans la fabrication de pâte

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001029297A1 (fr) 1999-10-20 2001-04-26 Auckland Uniservices Limited Procede de separation de fibres
WO2010018120A2 (fr) 2008-08-11 2010-02-18 Voith Patent Gmbh Dispositif de fractionnement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5881887A (en) * 1993-04-16 1999-03-16 Fongen; Sigurd Apparatus called "TSS"-the turbo screening system, for filtering and fractionation of suspensions containing fibres, fibre fragments, fines and other particles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001029297A1 (fr) 1999-10-20 2001-04-26 Auckland Uniservices Limited Procede de separation de fibres
WO2010018120A2 (fr) 2008-08-11 2010-02-18 Voith Patent Gmbh Dispositif de fractionnement

Also Published As

Publication number Publication date
WO2012119998A3 (fr) 2012-11-01
DE102011005224A1 (de) 2012-09-13

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