EP0432448B1 - Procédé de fabrication de tamis à fentes - Google Patents

Procédé de fabrication de tamis à fentes Download PDF

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Publication number
EP0432448B1
EP0432448B1 EP90121239A EP90121239A EP0432448B1 EP 0432448 B1 EP0432448 B1 EP 0432448B1 EP 90121239 A EP90121239 A EP 90121239A EP 90121239 A EP90121239 A EP 90121239A EP 0432448 B1 EP0432448 B1 EP 0432448B1
Authority
EP
European Patent Office
Prior art keywords
joints
coverings
longitudinal bodies
screen
transverse rods
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.)
Expired - Lifetime
Application number
EP90121239A
Other languages
German (de)
English (en)
Other versions
EP0432448A1 (fr
Inventor
Maurus Pellhammer
Wolfgang Ehmcke
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss 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 Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT90121239T priority Critical patent/ATE99749T1/de
Publication of EP0432448A1 publication Critical patent/EP0432448A1/fr
Application granted granted Critical
Publication of EP0432448B1 publication Critical patent/EP0432448B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/496—Multiperforated metal article making
    • Y10T29/49604—Filter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/4962—Grille making

Definitions

  • the invention relates to a method for producing a slotted screen, which is particularly suitable for use in plants for sorting or cleaning treatment of aqueous fiber suspensions, e.g. in paper production, it is suitable in which method wire or rod-shaped long bodies are attached to cross bars, which limit the screen gaps.
  • a method for producing a slotted screen which is particularly suitable for use in plants for sorting or cleaning treatment of aqueous fiber suspensions, e.g. in paper production, it is suitable in which method wire or rod-shaped long bodies are attached to cross bars, which limit the screen gaps.
  • Such a method is known from EP-A-0 287 408
  • slotted screens which are also understood to mean limited shorter slot lengths or so-called slot screens having interrupted gaps, come in various screen shapes, e.g. as cylindrical sieve baskets, flat sieves, curved sieves, half-shell sieves, drum sieves or the like.
  • slotted screens are used, among other things. used in sorters, reject sorters and so-called fractionators.
  • the sorters are used to remove the contaminants, such as impurity particles, from an aqueous fibrous stock suspension, which in this phase of the treatment has approx. 0.5 to 4% fibers and approx. 96 to 99.5% water content, while the fractionators serve to separate two fractions with fibers of different lengths from each other and to hold the long fibers on the sieve and remove them separately.
  • Such screens are also used in reject sorters and drum screens, which work at fabric densities of up to 20%.
  • the invention is therefore based on the object to provide a method for producing slotted screens, which designs the screens on their connections in such a way that the risk of snagging and thus of flocculation and / or spinning of the fibers on the slotted screens and of blockages entirely or largely is reduced, and which can also be associated with an increase in strength at the connection points.
  • connection points on their exposed outer sides have a smooth surface Overlaps are provided. These overlaps should expediently be smoothly rounded on their outside or be shaped like a groove.
  • all media can be used for the smooth covering of the connections, which, due to their surface tension, have a surface-smooth and rounded under certain circumstances Coverage of the connection result.
  • the material that has already melted during welding and later solidifies to form a burr can also be used for covering, by partially heating and melting again after the actual welding process, e.g. under protective gas (so-called TIG arc).
  • the slotted screen produced according to the invention has the advantage that its strength at the connection point is increased (e.g. reduction in the notch effect), which is particularly important because of the alternating load occurring there during operation.
  • the choice of a material flowing at a relatively low temperature in comparison to the melting temperature of the bars and longitudinal members gives a further advantage.
  • the e.g. The relatively low temperature required for soldering poses little risk of the slotted screen being distorted, and the existing connections are no longer softened or melted.
  • the slotted screen shown in the drawing has longitudinal bodies 1 formed from wedge-shaped profile bars, which are connected to one another on their underside by cross bars 2 which are round in cross section and to which they are welded.
  • the welded connections 3 between the profile bars 1 and the cross bar 2 still have irregular and uneven surfaces in the unfinished state (FIG. 2).
  • the coverings 4 made of solder or another smooth-flowing, solidifying material applied to the exposed areas of these surfaces according to the invention are shown in FIG. Due to the high surface tension of the covering material, these overlaps have a smooth surface, which are smoothly rounded off, in particular in the region of their connection to the peripheral surface of the crossbar 2.
  • connection points 3 for the operation of the screen can also be disadvantageous, as already described with reference to the weld seams. The same applies to the points 5, which ensure the exact distance of the profile bars 1 from the adjacent profile bars.
  • Figure 5 shows the subject matter of the invention according to claim 3 or the claims referring to this.
  • the covers 4 close the disadvantageous cavities at the connection points and cover edges and ridges.
  • Figure 7 explains in particular claims 10 and 11. It is shown that the cover 4 is formed from the material of the previously applied weld.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Inert Electrodes (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Filtering Materials (AREA)

Claims (12)

  1. Procédé de fabrication d'un tamis à fentes convenant en particulier à être utilisé dans des installations de traitement pour classer ou épurer des suspensions aqueuses de matière fibreuse, par exemple dans la fabrication de papier, dans lequel des corps longitudinaux (1) en forme de fils ou de baguettes délimitant les fentes du tamis sont posés sur des barreaux transversaux (2),
    caractérisé en ce que les jonctions (3) entre les corps longitudinaux (1) et les barreaux transversaux (2) sont recouvertes sur leurs surfaces exposées avec un matériau s'écoulant en formant une surface lisse, solidifiée, de telle sorte qu'après l'application du procédé les points de jonction sont munis, en ces endroits, de revêtements (4) ayant une surface lisse.
  2. Procédé selon la revendication 1, caractérisé en ce que les jonctions (3) recouvertes sont des jonctions par soudage.
  3. Procédé selon la revendication 1, caractérisé en ce que les jonctions (3) sont formées par enroulement des corps longitudinaux (1) autour des barreaux transversaux (2), des entretoises pouvant être présentes pour maintenir une fente voulue.
  4. Procédé selon la revendication 1, caractérisé en ce que les revêtements (4) sont arrondis et lisses sur leur face extérieure.
  5. Procédé selon la revendication 1, caractérisé en ce que les revêtements (4) ont la forme d'une moulure concave sur leur face extérieure.
  6. Procédé selon la revendication 5, caractérisé en ce que les revêtements (4) sont faits d'un matériau qui, dans sa forme liquide, s'étire sur les surfaces à recouvrir grâce à sa tension superficielle.
  7. Procédé selon la revendication 1, caractérisé en ce que de la brasure, de la soudure tendre, ou des matières plastiques dures ou thermoplastiques ou autres, s'écoulant et se solidifiant de manière lisse, est appliquée sur les jonctions (3) entre les corps longitudinaux et les barreaux transversaux, en recouvrant ces jonctions.
  8. Procédé selon une ou plusieurs des revendications 1 à 7, caractérisé par l'application sur les jonctions (3) entre les corps longitudinaux et les barreaux transversaux de poudre ou de pâte qui est ensuite fondue lors d'un traitement ultérieur et se solidifie ensuite de manière à former les revêtements (4).
  9. Procédé selon une ou plusieurs des revendications 1 à 7, caractérisé en ce que le matériau s'écoulant et se solidifiant sous forme lisse est appliqué par immersion, les zones du tamis à fentes ne devant pas être recouvertes étant préalablement munies d'une couche qui repousse le matériau à écoulement lisse.
  10. Procédé selon la revendication 2, caractérisé en ce que les jonctions soudées sont refondues par un réchauffage particulièrement bref de leur surface, de telle sorte que les revêtements (4) se forment à ces endroits à partir du matériau de soudage initial.
  11. Procédé selon la revendication 10, caractérisé en ce que le bref réchauffage a lieu au moyen d'un arc électrique appliqué pendant un temps bref à proximité immédiate des jonctions (3).
  12. Procédé selon la revendication 11, caractérisé en ce que l'arc est formé sous un gaz de soudage protecteur.
EP90121239A 1989-12-09 1990-11-07 Procédé de fabrication de tamis à fentes Expired - Lifetime EP0432448B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90121239T ATE99749T1 (de) 1989-12-09 1990-11-07 Verfahren zur herstellung eines spaltsiebes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3940718 1989-12-09
DE3940718 1989-12-09

Publications (2)

Publication Number Publication Date
EP0432448A1 EP0432448A1 (fr) 1991-06-19
EP0432448B1 true EP0432448B1 (fr) 1994-01-05

Family

ID=6395127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90121239A Expired - Lifetime EP0432448B1 (fr) 1989-12-09 1990-11-07 Procédé de fabrication de tamis à fentes

Country Status (5)

Country Link
US (1) US5237154A (fr)
EP (1) EP0432448B1 (fr)
AT (1) ATE99749T1 (fr)
CA (1) CA2030712A1 (fr)
DE (1) DE59004134D1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI100344B (fi) * 1995-11-28 1997-11-14 Ahlstrom Machinery Oy Menetelmä lankaseulatuotteen valmistamiseksi ja lankaseulatuote
EP0808941B1 (fr) * 1996-05-24 2001-12-12 Voith Sulzer Stoffaufbereitung GmbH Procédé de fabrication d'un appareil de tamisage à ouvertures en forme de fentes et appareil de tamisage produit par ce procédé
WO2001051168A1 (fr) * 2000-01-07 2001-07-19 Kadant Black Clawson, Inc. Crible a fils profiles cylindrique et son procede de fabrication
US6491168B1 (en) 2000-04-23 2002-12-10 J + L Fiber Services, Inc. Pulp screen basket
FR2809029B1 (fr) * 2000-05-16 2002-06-21 Johnson Filtration Systems Procede de fabrication d'un panier mecanique de filtration
US6460757B1 (en) 2000-11-14 2002-10-08 Newscreen As Apparatus and method for forming slotted wire screens
CA2802168A1 (fr) * 2001-04-16 2002-10-24 J & L Fiber Services, Inc. Epurateur a pate a papier et son procede
US7108152B2 (en) * 2002-02-08 2006-09-19 Henny Penny Corporation Fryer vats having strengthened vat welds and methods of manufacturing such fryer vats
JP2005230869A (ja) * 2004-02-20 2005-09-02 Toyoda Mach Works Ltd 異種金属ｔｉｇ溶接方法及びその溶接構造
DE102005034789A1 (de) * 2005-07-21 2007-01-25 Boll & Kirch Filterbau Gmbh Verfahren zum Herstellen von metallischen Spaltsieben, Verfahren zum Herstellen von metallischen Spaltrohrfiltern und Spaltrohrfilter
US20090211965A1 (en) * 2008-02-21 2009-08-27 Weatherford/Lamb, Inc. Arrangement for splicing panels together to form a cylindrical screen
US8028691B2 (en) 2008-10-27 2011-10-04 Johnson Screens, Inc. Passive solar wire screens for buildings
CA2678839A1 (fr) * 2009-09-14 2011-03-14 Gea Houle Inc. Separateur a grille horizontale rotative
US9023456B2 (en) 2011-03-18 2015-05-05 Bilfinger Water Technologies, Inc. Profiled wire screen for process flow and other applications
DE102015003020B3 (de) * 2015-03-06 2016-03-03 Andritz Fiedler Gmbh Stabsiebkorb

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR329445A (fr) * 1903-02-20 1903-07-30 Carriere H Perfectionnements aux appareils d'épuration des pates à papier
US3370150A (en) * 1965-07-07 1968-02-20 Leonard Concrete Pipe Company Welding apparatus and method
DE1760694A1 (de) * 1968-06-21 1971-03-11 Kufferath Antonius Siebgewebe und Verfahren zu seiner Herstellung
BE792211A (fr) * 1971-12-03 1973-06-01 Rech Des Etats De Surface Cent Element filtrant
US4221319A (en) * 1978-08-09 1980-09-09 Paco Corporation Apparatus for welding metal grating structures
US4221951A (en) * 1978-10-10 1980-09-09 Connolly James D Screen welding machine
FR2612081B1 (fr) * 1987-03-13 1991-02-08 Lamort E & M Perfectionnement aux tamis pour epurateur et a leur mode de fabrication
DE8910605U1 (de) * 1989-09-06 1989-10-26 Steinhaus GmbH, 4330 Mülheim Schweißspaltsiebfeld

Also Published As

Publication number Publication date
US5237154A (en) 1993-08-17
CA2030712A1 (fr) 1991-06-10
EP0432448A1 (fr) 1991-06-19
ATE99749T1 (de) 1994-01-15
DE59004134D1 (de) 1994-02-17

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