EP0432448B1 - Procédé de fabrication de tamis à fentes - Google Patents
Procédé de fabrication de tamis à fentes Download PDFInfo
- 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
Links
Images
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)
- 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. - Procédé selon la revendication 1, caractérisé en ce que les jonctions (3) recouvertes sont des jonctions par soudage.
- 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.
- Procédé selon la revendication 1, caractérisé en ce que les revêtements (4) sont arrondis et lisses sur leur face extérieure.
- Procédé selon la revendication 1, caractérisé en ce que les revêtements (4) ont la forme d'une moulure concave sur leur face extérieure.
- 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.
- 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.
- 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).
- 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.
- 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.
- 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).
- Procédé selon la revendication 11, caractérisé en ce que l'arc est formé sous un gaz de soudage protecteur.
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)
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)
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 |
-
1990
- 1990-11-07 DE DE90121239T patent/DE59004134D1/de not_active Expired - Fee Related
- 1990-11-07 EP EP90121239A patent/EP0432448B1/fr not_active Expired - Lifetime
- 1990-11-07 AT AT90121239T patent/ATE99749T1/de not_active IP Right Cessation
- 1990-11-27 CA CA002030712A patent/CA2030712A1/fr not_active Abandoned
- 1990-12-07 US US07/623,512 patent/US5237154A/en not_active Expired - Fee Related
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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