WO2013029930A1 - Toile - Google Patents

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Publication number
WO2013029930A1
WO2013029930A1 PCT/EP2012/065379 EP2012065379W WO2013029930A1 WO 2013029930 A1 WO2013029930 A1 WO 2013029930A1 EP 2012065379 W EP2012065379 W EP 2012065379W WO 2013029930 A1 WO2013029930 A1 WO 2013029930A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen according
screen
coating
sieve
coatings
Prior art date
Application number
PCT/EP2012/065379
Other languages
German (de)
English (en)
Inventor
Werner Brettschneider
Christian Steinmassl
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
Priority to CN201290000781.9U priority Critical patent/CN204282112U/zh
Priority to EP12750559.2A priority patent/EP2751336B1/fr
Publication of WO2013029930A1 publication Critical patent/WO2013029930A1/fr

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
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the invention relates to a screen for the treatment of a liquid to pasty medium with a plurality of screen openings and a coated, facing the direction of flow inlet side and a coated, pointing in the flow direction drainage side.
  • Such screens are used for example for wet screening of pulp suspensions to remove impurities present therein.
  • they are rigid and differ from flexible endless screens used in screen presses and paper machines.
  • 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 object has been achieved in that the coatings of the inlet and the outlet side are formed differently. Due to the different coating, it is also possible to better address the different requirements and loads on both sides of the screen. Since the inlet side is usually exposed to high wear, the coating of the inlet side should consist of very wear-resistant material. For this purpose, in particular ceramic, chromium or a sintered metal such as tungsten carbide is suitable.
  • the coating of the inlet side is wear-resistant, wherein the hardness of which is preferably between 800 and 2800 HV (Vickers hardness) and / or the coating of the drain side has a reduced adhesion, wherein the adhesion is less than 60 mJ / mm 2 and preferably between 15 and 30 mJ / mm 2 .
  • Teflon, nanoparticles, plastics are particularly suitable for the realization of a coating with reduced adhesion.
  • the screen may be rigid or flexible. Furthermore, this also determines whether the sieve is flat or uneven, in particular designed as a cylinder. In particular, for thin coatings, it is advantageous if they are applied to a base body. This can be done for example by applying a coating in liquid or pasty form or by gluing or welding a film.
  • both coatings are applied to a base body, the effort is reduced if this is the common base of both coatings.
  • the main body of a separate body or one common to the other coating or from the other coating itself be formed.
  • 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.
  • Figures 1 and 2 show schematic partial cross sections through differently constructed sieves.
  • the sieves have a plurality of as evenly distributed arranged sieve openings 1 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.
  • 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.
  • Impurities are retained and can be removed on the inlet side 3, for example, with a reamer.
  • 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 coating 5 of chromium, ceramic or tungsten carbide.
  • the hardness is in the range between 800 and 2800 HV (Vickers hardness).
  • the discharge side 4 is formed by a coating 6 with reduced adhesion, a so-called non-stick layer.
  • the service life of the screen at constant operating parameters be significantly extended.
  • the effort to clean the screens can be omitted or reduced.
  • the structure can vary accordingly.
  • both coatings 5, 6 were applied to a common main body 7. This is possible, for example, by applying the coatings 5, 6 in liquid or pasty form and subsequent curing of the coatings 5, 6.
  • the screen according to FIG. 2 differs therefrom in that both coatings 5, 6 have each been applied to a separate main body 7, 8.
  • the two main body 7,8 are here releasably or permanently connected to each other.

Landscapes

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

Abstract

L'invention concerne une toile servant à traiter un milieu liquide à pâteux, comprenant une pluralité d'ouvertures de toile (1) ainsi qu'un côté entrée (3) revêtu, orienté dans le sens inverse au sens de passage (2), et un côté sortie (4) revêtu, orienté dans le sens de passage (2). L'objectif de l'invention est d'obtenir un effet de tri et un débit qui soient les plus constants possibles. À cet effet, les revêtements (5, 6) du côté entrée (3) et du côté sortie (4) sont conçus différemment.
PCT/EP2012/065379 2011-09-01 2012-08-07 Toile WO2013029930A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201290000781.9U CN204282112U (zh) 2011-09-01 2012-08-07 筛网
EP12750559.2A EP2751336B1 (fr) 2011-09-01 2012-08-07 Tamis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011081951.7 2011-09-01
DE102011081951A DE102011081951A1 (de) 2011-09-01 2011-09-01 Sieb I

Publications (1)

Publication Number Publication Date
WO2013029930A1 true WO2013029930A1 (fr) 2013-03-07

Family

ID=46724369

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/065379 WO2013029930A1 (fr) 2011-09-01 2012-08-07 Toile

Country Status (4)

Country Link
EP (1) EP2751336B1 (fr)
CN (1) CN204282112U (fr)
DE (1) DE102011081951A1 (fr)
WO (1) WO2013029930A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020219637A1 (fr) * 2019-04-26 2020-10-29 Kadant Black Clawson, Llc Cylindre de tamis à protection de largeur de fente améliorée et procédé d'élimination de contaminants solides d'une suspension solide

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10099155B2 (en) * 2016-02-26 2018-10-16 Crown Iron Works Company Screen for extractor system
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2723032A (en) * 1950-12-18 1955-11-08 Mining Process & Patent Co Vibrating screens
EP0471195A1 (fr) * 1990-08-16 1992-02-19 CAE Investments B.V. Toiles et techniques de fabrications
DE4334283A1 (de) * 1993-10-08 1995-04-13 Voith Gmbh J M Verfahren zur Bereitstellung von rezyklisierbarem Feinstoff
WO1995023655A1 (fr) * 1994-03-03 1995-09-08 United Wire Limited Tamis ameliore
WO2008131974A1 (fr) * 2007-04-30 2008-11-06 Voith Patent Gmbh Procédé de fabrication d'un classeur, en particulier d'un classeur rigide pour le traitement de suspensions de matières fibreuses convenant à la fabrication du papier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3013941A1 (de) * 1980-04-11 1981-10-29 J.M. Voith Gmbh, 7920 Heidenheim Siebkorb
FI862725A0 (fi) * 1986-06-26 1986-06-26 Ahlstroem Oy Slitfast haolplatta.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2723032A (en) * 1950-12-18 1955-11-08 Mining Process & Patent Co Vibrating screens
EP0471195A1 (fr) * 1990-08-16 1992-02-19 CAE Investments B.V. Toiles et techniques de fabrications
DE4334283A1 (de) * 1993-10-08 1995-04-13 Voith Gmbh J M Verfahren zur Bereitstellung von rezyklisierbarem Feinstoff
WO1995023655A1 (fr) * 1994-03-03 1995-09-08 United Wire Limited Tamis ameliore
WO2008131974A1 (fr) * 2007-04-30 2008-11-06 Voith Patent Gmbh Procédé de fabrication d'un classeur, en particulier d'un classeur rigide pour le traitement de suspensions de matières fibreuses convenant à la fabrication du papier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020219637A1 (fr) * 2019-04-26 2020-10-29 Kadant Black Clawson, Llc Cylindre de tamis à protection de largeur de fente améliorée et procédé d'élimination de contaminants solides d'une suspension solide
CN114026284A (zh) * 2019-04-26 2022-02-08 凯登百利可乐生有限公司 具有改善的槽宽保护的筛筒和从固体悬浮物去除固体污染物的方法

Also Published As

Publication number Publication date
EP2751336A1 (fr) 2014-07-09
EP2751336B1 (fr) 2020-10-28
DE102011081951A1 (de) 2013-03-07
CN204282112U (zh) 2015-04-22

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