EP2780505B1 - Tamis - Google Patents

Tamis Download PDF

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Publication number
EP2780505B1
EP2780505B1 EP12779044.2A EP12779044A EP2780505B1 EP 2780505 B1 EP2780505 B1 EP 2780505B1 EP 12779044 A EP12779044 A EP 12779044A EP 2780505 B1 EP2780505 B1 EP 2780505B1
Authority
EP
European Patent Office
Prior art keywords
screen
slot
openings
section
front 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.)
Active
Application number
EP12779044.2A
Other languages
German (de)
English (en)
Other versions
EP2780505A1 (fr
Inventor
Werner Brettschneider
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
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Voith Patent GmbH
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Publication date
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Publication of EP2780505A1 publication Critical patent/EP2780505A1/fr
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Publication of EP2780505B1 publication Critical patent/EP2780505B1/fr
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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
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the invention relates to a sieve according to the preamble of claim 1.
  • the invention also relates to a method for producing the screen.
  • Such screens are used for example for wet screening of pulp suspensions to remove impurities present therein. As a rule, they are rigid and differ from flexible endless screens used in screen presses and paper machines.
  • the EP 0 613 509 B1 discloses a sieve according to the preamble of claim 1.
  • the object of the invention is to improve the sorting effect and / or throughput while ensuring the required screen stability.
  • the one-piece design because of the lack of dividing lines within the respective section of the screen surface ensures the required strength of the section or of the screen at all. This high strength in turn allows the increase of the open screen area and thus the throughput.
  • slots are formed with and between parallel screen bars.
  • this is relatively expensive to manufacture and, on the other hand, limits the achievable open screen area while ensuring high strength.
  • the profiled screen front creates turbulence in the suspension, significantly improving sorting efficiency and throughput, which has a positive impact on energy requirements.
  • the throughput can also be increased by the fact that at least a portion of the slot-shaped screen openings at least a section opens into a survey of the profile of the Siebvorderseite and / or at least in part of the slot-shaped screen openings, the height of the mouth on the Siebvorderseite in the longitudinal direction of the slot changed.
  • the open screen area of the section is between 15 and 25%.
  • the positive effects of the invention can then be used extensively if the entire sieve, in particular the entire perforated sieve surface is integrally formed.
  • the profile depth of the screen front side is between 0.5 and 3 mm, preferably between 0.7 and 1.2 mm.
  • the thickness of the screen between 2 and 8 mm, preferably between 4 and 6 mm and / or the web width between adjacent slot-shaped screen openings should be greater than 0.3 mm, and preferably between 1 and 5 mm.
  • the cross section of the slot-shaped screen openings lying perpendicular to the flow direction has at least one round section or only straight sections.
  • the sieve can be flat or designed as a cylinder, wherein the slot-shaped sieve openings preferably extend approximately parallel to the cylinder axis.
  • the use of the invention is particularly suitable for treating a pulp suspension suitable for producing a paper, board, tissue or other fibrous web.
  • at least the one-piece section of the screen preferably the entire screen should be made of metal.
  • the slot-shaped screen openings should have a width between 0.1 and 1.0 mm, preferably between 0.1 and 0.45 mm. Cost advantages in the manufacture of the screen arise when the slot-shaped screen openings of at least one section and preferably also the profile of the front side of the screens are produced by means of water jet cutting. For this purpose, the thickness of the screen should be less than 20 mm.
  • the result of the production of the slot-shaped screen openings is also an irregular profiling of the area of the opening, which can already be sufficient in many cases.
  • FIG. 1 can be seen a pressure sorter according to the invention with a one-piece, metallic screen 2, here in the form of a cylindrical screen basket with a vertical cylinder axis 10, which divides the interior of the pressure sorter in an inlet space 8 and an accepts space 9.
  • a pressure sorter according to the invention with a one-piece, metallic screen 2, here in the form of a cylindrical screen basket with a vertical cylinder axis 10, which divides the interior of the pressure sorter in an inlet space 8 and an accepts space 9.
  • the pulp suspension 1 is fed via a suspension feed 11.
  • the pulp suspension 1 receives an angular momentum which causes it to move circumferentially.
  • a transport flow is generated as a result of the applied pressure gradient between the above drawn suspension inlet 11 and the underlying Rejektauslauf 12 of the inlet chamber 8.
  • the rejected from the screen 2 part of the pulp suspension 1 is conveyed as a reject 18 via the Rejektauslauf 12 from the feed chamber 8.
  • this sieve scraper is formed by a rotor 6 rotating in the screen 2 with rotor blades 15 attached thereto.
  • the rotor 6 has the shape of a cylindrical drum, wherein the axis of rotation 7 coincides with the cylinder axis 10.
  • All rotor blades 15 in this case have the same shape, which leads to a uniform effect on the pulp suspension 1 and the wire 2.
  • the rotor blades 15 are arranged distributed over a plurality of perpendicular to the axis of rotation 7 extending circumferential planes of the rotor 6.
  • the rotor blades 15 are formed by way of example as elevations on the rotor 6.
  • the sieve surface comprises a multiplicity of sieve openings 3 arranged as uniformly as possible with the same minimum cross-sectional area in the direction of flow 5 to ensure the same sorting effect.
  • the open screen area of the screen 2 is between 15 and 25%.
  • the sum of the smallest flow cross-sections through the sieve 2 relative to the respective perforated sieve surface is considered as open sieve surface.
  • FIG. 2 represented a pulper, in whose container 16 a suspension 1 of pulp and water is formed.
  • the suspension is 1 from a front of a sieve 2 at the bottom of the container 16 rotating rotor 6 mixed.
  • the rotor 6 generates in front of the screen 2 a rotational flow, which improves the sorting effect and the passage.
  • the screen 2 which is an example here, is flowed through by the pulp suspension 1 from the front of the sieve 4. Larger impurities are retained and can be cleared away from the rotor 6 on the Siebvorderseite 4.
  • the suspension 1 After flowing through the sieve 2, the suspension 1 can be collected and removed under the sieve 2.
  • the longest extent of the slots in the screen 2 is approximately perpendicular to the rotational flow generated by the rotor 6 14 of the suspension 1 in front of the screen. 2
  • the slot-shaped screen openings 3 have a width of 0.1 to 0.45 mm and a length of between 10 and 100 mm.
  • the Siebvorderseite 4 of the screen 2 according to the FIGS. 3 and 4 an irregular micro-profile whose depth is between 0.5 and 1.2 mm. This profile has the consequence that the height of the mouth on the Siebvorderseite 4 changed in the longitudinal direction of the slot and ensures microturbulence in the suspension.
  • the sieve 2 in addition to this micro-profile, the sieve 2, as in FIG. 4 shown, still makroProfile in the form of grooves o.ä. having a tread depth between 1.2 and 3 mm or more.
  • the screen openings 3 on the Siebvorderseite 4th partially or wholly in the sinks or even in the surveys of the macro-profile.
  • This variety of mouth design also extends the sorting characteristics of the screen openings 3 and also has more turbulence in the suspension 1 result.
  • the screen openings 3 are arranged in parallel rows, wherein the web width between the, on the long sides adjacent slot-shaped screen openings 3 is approximately between 1 and 5 mm.
  • FIGS. 5a-d show ways of slot design of the screen openings 3.
  • the slots are formed only by a single straight section.
  • the slots have at FIG. 5b two straight sections, the sections forming an obtuse angle. at FIG. 5d These obtuse-angled slots are arranged offset to one another.
  • the slots in FIG. 5c are formed exclusively by round sections.
  • the material to be processed is separated by a high-pressure water jet, wherein a cutting agent, a so-called abrasive, is added to the water to increase the cutting power.
  • a cutting agent a so-called abrasive
  • the water jet cutting allows the introduction of narrow slits even in such a thick, metallic screens 2. As a result, a large open screen surface generated and also counted because of the one-piece with a high strength of the screen 2 become.
  • a conical or trumpet-shaped widening of the screen openings 3 in the flow direction 5, as in FIG. 4 shown, can be easily generated with the water jet cutting from the back of the screen.
  • the angle 19 between a straight line through the sieve front-side beginning and the siebrück workede end of the wall of the sieve opening 3 and the flow direction 5 is between 3 and 5 °.

Landscapes

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

Claims (15)

  1. Tamis (2) avec une face avant de tamis profilée (4) destiné au traitement d'une suspension (1) muni d'une multiplicité d'ouvertures de tamis en forme de fentes (3), dans lequel au moins une portion du tamis (2) comprenant plusieurs ouvertures de tamis en forme de fentes (3) est réalisée en une seule pièce, caractérisé en ce que le tamis (2) présente une surface de tamis ouverte comprise entre 12 et 33 %, dans lequel au moins pour une partie des ouvertures de tamis en forme de fentes (3) au moins une partie débouchent dans une surélévation du profil de la face avant de tamis (4) et/ou au moins pour une partie des ouvertures de tamis en forme de fentes (3) la hauteur de l'embouchure sur la face avant de tamis (4) varie dans la direction longitudinale de la fente.
  2. Tamis (2) selon la revendication 1, caractérisé en ce que la face de tamis ouverte de la portion se situe entre 15 et 25 %.
  3. Tamis (2) selon une revendication 1 ou 2, caractérisé en ce que toute la face de tamis perforée est réalisée en une seule pièce.
  4. Tamis (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'épaisseur du tamis (2) est inférieure à 20 mm et se situe de préférence entre 2 et 8 mm.
  5. Tamis (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que la profondeur du profil de la face avant de tamis (4) est inférieure à 3 mm et se situe de préférence entre 0,7 et 1,2 mm.
  6. Tamis (2) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins une partie importante, de préférence la totalité, des ouvertures de tamis en forme de fentes (3) sont disposées parallèlement l'une à l'autre.
  7. Tamis (2) selon la revendication 6, caractérisé en ce que la largeur de plage entre des ouvertures de tamis en forme de fentes voisines (3) est supérieure à 0,3 mm et se situe de préférence entre 1 et 5 mm.
  8. Tamis (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que les ouvertures de tamis en forme de fentes (3) ont une largeur comprise entre 0,1 et 1,0 mm, de préférence entre 0,1 et 0,45 mm.
  9. Tamis (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que la section transversale des ouvertures de tamis en forme de fentes (3) située transversalement à la direction d'écoulement (5) présente au moins une portion ronde.
  10. Tamis (2) selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la section transversale des ouvertures de tamis en forme de fentes (3) située transversalement à la direction d'écoulement (5) ne présente que des portions droites.
  11. Tamis (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que les ouvertures de tamis (3) s'élargissent dans la direction d'écoulement (5), en particulier s'évasent en forme de cône ou de trompette, dans lequel l'angle (19) entre une droite passant par le début côté face avant de tamis et la fin côté face arrière de tamis de la paroi de l'ouverture de tamis (3) et la direction d'écoulement (5) se situe entre 1 et 8°, de préférence entre 3 et 5°.
  12. Tamis (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que le tamis (2) est plan.
  13. Tamis (2) selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le tamis (2) est réalisé sous forme de cylindre et les ouvertures de tamis en forme de fentes (3) s'étendent de préférence environ parallèlement à l'axe du cylindre (10).
  14. Tamis (2) selon l'une quelconque des revendications précédentes destiné au traitement d'une suspension de matière fibreuse (1) convenant pour la fabrication d'une bande de papier, de carton, d'essuie-tout ou d'une autre bande de matière fibreuse, caractérisé en ce qu'au moins la portion en une seule pièce du tamis (2) est constituée de métal.
  15. Procédé de fabrication d'un tamis (2) avec des ouvertures de tamis en forme de fentes (3) et une face avant de tamis profilée (4) selon l'une quelconque des revendications précédentes, dans lequel on réalise les ouvertures de tamis en forme de fentes (3) d'au moins une portion et de préférence aussi le profil de la face avant de tamis (4) par découpe au jet d'eau.
EP12779044.2A 2011-11-16 2012-10-25 Tamis Active EP2780505B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011086428A DE102011086428A1 (de) 2011-11-16 2011-11-16 Sieb
DE202011108856U DE202011108856U1 (de) 2011-11-16 2011-12-06 Sieb
PCT/EP2012/071140 WO2013072174A1 (fr) 2011-11-16 2012-10-25 Tamis

Publications (2)

Publication Number Publication Date
EP2780505A1 EP2780505A1 (fr) 2014-09-24
EP2780505B1 true EP2780505B1 (fr) 2019-09-11

Family

ID=45805113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12779044.2A Active EP2780505B1 (fr) 2011-11-16 2012-10-25 Tamis

Country Status (6)

Country Link
EP (1) EP2780505B1 (fr)
CN (1) CN103930617B (fr)
DE (2) DE102011086428A1 (fr)
ES (1) ES2751461T3 (fr)
PT (1) PT2780505T (fr)
WO (1) WO2013072174A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014013650A1 (de) * 2014-09-19 2016-03-24 Siebtechnik Gmbh Siebbelag und Verfahren zur Herstellung eines Siebbelages
CN105317702A (zh) * 2015-10-28 2016-02-10 泉州市永茂电子科技有限公司 一种远程控制水泵
DE102016202586A1 (de) * 2016-02-19 2017-08-24 Voith Patent Gmbh Stofflöser

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2086271U (zh) * 1991-03-12 1991-10-09 邱俊雄 用于筛选机的圆筒形筛板
FI89521C (fi) * 1991-10-04 1993-10-11 Cae Investments Bv Foerfarande foer framstaellning av en silprodukt och genom foerfarandet framstaelld silprodukt
US5607589A (en) * 1995-06-06 1997-03-04 Cae Screenplates Inc. Multiple contour screening
SE507471C2 (sv) * 1996-08-09 1998-06-08 Sunds Defibrator Ind Ab Silpanel samt sätt för dess framställning
WO2011113990A1 (fr) * 2010-03-16 2011-09-22 Tampulping Oy Filtre sous pression

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE202011108856U1 (de) 2012-01-20
CN103930617B (zh) 2017-02-22
EP2780505A1 (fr) 2014-09-24
ES2751461T3 (es) 2020-03-31
PT2780505T (pt) 2019-11-27
DE102011086428A1 (de) 2013-05-16
CN103930617A (zh) 2014-07-16
WO2013072174A1 (fr) 2013-05-23

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