EP2751335B1 - Tamis pour le traitement d'un fluide de liquide à pateux - Google Patents

Tamis pour le traitement d'un fluide de liquide à pateux Download PDF

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Publication number
EP2751335B1
EP2751335B1 EP12743978.4A EP12743978A EP2751335B1 EP 2751335 B1 EP2751335 B1 EP 2751335B1 EP 12743978 A EP12743978 A EP 12743978A EP 2751335 B1 EP2751335 B1 EP 2751335B1
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EP
European Patent Office
Prior art keywords
screen
screen according
layer
sieve
layers
Prior art date
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Active
Application number
EP12743978.4A
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German (de)
English (en)
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EP2751335A2 (fr
Inventor
Werner Brettschneider
Christian Steinmassl
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 EP2751335A2 publication Critical patent/EP2751335A2/fr
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Publication of EP2751335B1 publication Critical patent/EP2751335B1/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
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the invention relates to a screen for the treatment of a liquid to pasty medium consisting of a plurality of layers and with a plurality of screen openings and a counter to the flow direction facing inlet side and a flow direction facing in the flow side.
  • Such sieves are inter alia in the DE 195 47 585 A1 described and 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 characteristic of such a sieve results essentially from the size, shape and number of sieve openings therein. These are usually kept smaller than the Stanfordsiebenden substances.
  • Such screens should have a sorting characteristic z. B. by round openings between 0.8 and 30 mm, depending on the coarseness of the materials, is achievable.
  • the object of the invention is therefore to ensure the most consistent sorting effect at constant throughput over the operating time.
  • the inlet side is formed by a wear-resistant layer, which consists of ceramic, chromium or a sintered metal such as tungsten carbide and that the drain side is formed by a layer of reduced adhesion, which consists of Teflon.
  • a wear-resistant layer which consists of ceramic, chromium or a sintered metal such as tungsten carbide
  • the drain side is formed by a layer of reduced adhesion, which consists of Teflon.
  • the inlet side of the screen is usually exposed to high wear, the inlet side is formed by a layer of very wear-resistant material, which consists of ceramic, chrome or a sintered metal such as tungsten carbide. It is advantageous if the wear-resistant layer of the inlet side has a hardness between 800 and 2800HV (Vickers hardness). Due to the different layers, the different requirements and loads on both sides of the screen can be better addressed. In particular, for thin layers, it is advantageous if they are applied to a base body. This can be done for example by applying a layer in liquid or pasty form or by gluing or welding a film. It may be advantageous to apply only one layer in this way. However, if both layers, ie, the wear-resistant layer and the reduced adhesion layer are applied to a base body, so the effort is reduced if this is the common basic body of both layers in the form of a middle layer.
  • the respective layer is exposed to a high stress, it may be advantageous for the formation of a robust and usually also relatively thick layer if at least one layer is formed by a separate sieve layer which is connected in a planar manner to a base body, for example adhesively bonded.
  • the screen may be rigid or flexible. Furthermore, this also determines whether the sieve is flat or uneven, in particular designed as a cylinder.
  • the inlet-side surface of the screen can be formed profiled. This is relatively easy to apply by welding beads or by laser.
  • the use of the screen according to the invention is particularly advantageous for treating a pulp suspension suitable for producing a paper, board, tissue or other fibrous web or in wastewater treatment or in the food industry.
  • FIGS. 1 to 3 schematic partial cross sections through differently constructed sieves.
  • the multilayer screens have a plurality of screen openings 1 arranged as uniformly as possible distributed with the same minimum cross-sectional area to ensure the same sorting effect.
  • the cross-sectional area of all screen openings 1 is exemplified by a circle.
  • Sieves which are to be used for the treatment of suspensions, must have a sufficient wall thickness for strength reasons.
  • the z. B. between 0.8 and 30 millimeters, particularly favorable methods, such as punching or laser cutting, can be used. This usually causes less costs than boring.
  • Further methods for producing the screen openings 1 are: milling, water jet cutting, etching, erosion, electrochemical drilling, flow hole forming or broaching. This can be easily screen openings 1 produce whose cross sections are not rotationally symmetric: z. As slots, rectangles, diamonds, hexagons or other polygons with rounded corners.
  • the sieve openings 1 can also increase towards the inlet 3 and / or the outlet side 4 of the sieve.
  • Most all adjacent screen openings 1 have the same distance from each other, which ensures effective utilization of the screen surface with high stability.
  • the screen openings 1 are often arranged in parallel rows.
  • the sieve which is here by way of example, flows through the pulp suspension from the feed side 3 in the flow direction 2. Larger impurities are retained and can be removed on the inlet side 3, for example, with a reamer. To ensure sufficient stability, the thickness of the screen in such applications is between 3 and 30 mm.
  • the inlet side 3 of the screen is formed by a wear-resistant layer 5 of chromium, carbide or tungsten carbide.
  • the hardness is in the range between 800 and 2800 HV / Vickers hardness.
  • the discharge side 4 is formed by a layer 6 with reduced adhesion, a so-called non-stick layer.
  • the service life of the screen at constant operating parameters can be significantly extended.
  • the effort to clean the screens can be omitted or reduced.
  • the structure can vary accordingly.
  • Both layers were 5.6 on one common body in the form of a middle layer 7 applied.
  • This is possible, for example, by the application of the layer 5, 6 in liquid or pasty form and subsequent hardening of the layers 5, 6.
  • FIGS. 1 and 2 show the variant that both layers 5,6 form the sieve alone, ie without intermediate middle layer 7.
  • at least one layer 5, 6 should be in solid form, so that the other layer 6, 5 can be applied to it.
  • Lying, as in FIG. 1 Both layers 5.6 in solid form, so they are releasably or permanently connected to form the screen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Claims (9)

  1. Tamis pour le traitement d'un fluide de liquide à pâteux, se composant de plusieurs couches (5, 6, 7) et avec une multiplicité d'ouvertures de tamis (1) ainsi qu'avec un côté d'arrivée (3) orienté à l'opposé de la direction d'écoulement (2) et un côté d'évacuation (4) orienté dans la direction d'écoulement (2), caractérisé en ce que le côté d'arrivée (3) est formé par une couche résistant à l'abrasion (5), qui se compose de céramique, de chrome ou d'un matériau fritté comme le carbure de tungstène, et en ce que le côté d'évacuation (4) est formé par une couche (6) d'adhérence moindre, qui se compose de téflon.
  2. Tamis selon la revendication 1, caractérisé en ce que la couche résistant à l'abrasion (5) présente une dureté comprise entre 800 et 2800 HV.
  3. Tamis selon la revendication 1 ou 2, caractérisé en ce qu'au moins une couche intermédiaire (7) est disposée entre les couches (5, 6) du côté d'arrivée (3) et du côté d'évacuation (4).
  4. Tamis selon l'une quelconque des revendications précédentes, caractérisé en ce que les couches voisines (5, 6, 7) sont assemblées à plat l'une à l'autre.
  5. Tamis selon l'une quelconque des revendications précédentes, caractérisé en ce que le tamis est plan.
  6. Tamis selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le tamis n'est pas plan, en particulier est réalisé en forme de cylindre.
  7. Tamis selon l'une quelconque des revendications précédentes, caractérisé en ce que le côté d'arrivée (3) du tamis est de forme profilée.
  8. Utilisation du tamis selon l'une quelconque des revendications précédentes pour le traitement d'une suspension de matière fibreuse convenant pour la fabrication d'une bande de papier, de carton, d'essuie-tout ou d'une autre bande de matière fibreuse.
  9. Utilisation du tamis selon l'une quelconque des revendications 1 à 7 lors du traitement des eaux usées.
EP12743978.4A 2011-09-01 2012-08-07 Tamis pour le traitement d'un fluide de liquide à pateux Active EP2751335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110081957 DE102011081957A1 (de) 2011-09-01 2011-09-01 Sieb II
PCT/EP2012/065386 WO2013029931A2 (fr) 2011-09-01 2012-08-07 Toile ii

Publications (2)

Publication Number Publication Date
EP2751335A2 EP2751335A2 (fr) 2014-07-09
EP2751335B1 true EP2751335B1 (fr) 2016-12-07

Family

ID=46639504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12743978.4A Active EP2751335B1 (fr) 2011-09-01 2012-08-07 Tamis pour le traitement d'un fluide de liquide à pateux

Country Status (4)

Country Link
EP (1) EP2751335B1 (fr)
CN (1) CN204282111U (fr)
DE (1) DE102011081957A1 (fr)
WO (1) WO2013029931A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105126469A (zh) * 2015-09-06 2015-12-09 成都易态科技有限公司 改性滤芯及其改性方法和应用
CN106049158A (zh) * 2016-05-30 2016-10-26 许昌中亚工业智能装备股份有限公司 一种新型造纸机用过滤网

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0567726A1 (fr) * 1992-04-29 1993-11-03 Voith Sulzer Stoffaufbereitung GmbH Dispositif de tamisage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1760694A1 (de) * 1968-06-21 1971-03-11 Kufferath Antonius Siebgewebe und Verfahren zu seiner Herstellung
US4601942A (en) * 1984-08-10 1986-07-22 Asten Group Inc. Laminated soft faced-spiral woven papermakers fabric
DE3909534A1 (de) * 1989-03-22 1990-09-27 Oberdorfer Fa F Formiersieb fuer die nasspartie einer papiermaschine
US5207873A (en) * 1992-04-17 1993-05-04 Huyck Corporation Anti-contaminant treatment for papermaking fabrics
DE19547585A1 (de) * 1995-12-20 1996-12-05 Voith Sulzer Stoffaufbereitung Verfahren zur Herstellung eines Siebelementes sowie nach diesem Verfahren hergestelltes Siebelement
AT413110B (de) * 2003-10-15 2005-11-15 Andritz Ag Maschf Sortierer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0567726A1 (fr) * 1992-04-29 1993-11-03 Voith Sulzer Stoffaufbereitung GmbH Dispositif de tamisage

Also Published As

Publication number Publication date
WO2013029931A3 (fr) 2013-08-15
WO2013029931A2 (fr) 2013-03-07
CN204282111U (zh) 2015-04-22
DE102011081957A1 (de) 2013-03-07
EP2751335A2 (fr) 2014-07-09

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