EP0432448A1 - Process for making a wedge wire - Google Patents

Process for making a wedge wire Download PDF

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Publication number
EP0432448A1
EP0432448A1 EP90121239A EP90121239A EP0432448A1 EP 0432448 A1 EP0432448 A1 EP 0432448A1 EP 90121239 A EP90121239 A EP 90121239A EP 90121239 A EP90121239 A EP 90121239A EP 0432448 A1 EP0432448 A1 EP 0432448A1
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EP
European Patent Office
Prior art keywords
connections
overlaps
longitudinal members
screen
covered
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.)
Granted
Application number
EP90121239A
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German (de)
French (fr)
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EP0432448B1 (en
Inventor
Maurus Pellhammer
Wolfgang Ehmcke
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Sulzer Escher Wyss GmbH
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Sulzer Escher Wyss GmbH
Escher Wyss GmbH
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Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT90121239T priority Critical patent/ATE99749T1/en
Publication of EP0432448A1 publication Critical patent/EP0432448A1/en
Application granted granted Critical
Publication of EP0432448B1 publication Critical patent/EP0432448B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 process 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-like or rod-shaped long bodies are attached to cross bars, which limit the screen gaps.
  • Such slotted screens which are also understood to mean limited shorter slot lengths or so-called slot screens with interrupted gaps, come in different 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 fiber suspension, which in this phase of the treatment has about 0.5 to 4% fibers and about 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 connections between longitudinal members and cross bars are mostly produced by welding or looping around.
  • the known so-called resistance welding for example, can be used as the welding process, in which an electrical current generates the heat of fusion at the contact points.
  • other welding processes are also generally suitable.
  • the method has the disadvantage that the sieves produced in this way have undesirable burrs on their exposed surfaces and have unwanted roughness, depressions, gaps or elevations.
  • 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 are suitable for the smooth covering of the connections, which, due to their surface tension, may 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 burrs 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 which flows at a relatively low temperature in comparison with the melting temperature of the rods and longitudinal members gives a further advantage.
  • the e.g. The relatively low temperature required for soldering poses little risk of warping the slotted screen, 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 profiled 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.

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

Abstract

In a process for making a slotted screen, which is suitable especially for use in plants for the sorting or cleaning treatment of aqueous suspensions of fibre material, for example in paper manufacture, longitudinal bodies (1) in the form of wire or rods and bounding the screen slots are fitted to transverse bars (2). To reduce the risk of catching and hence flocking and/or spinning of the fibres present in the suspension on the slotted screen as far as possible in the later operation of the screen, the joints (3) between the longitudinal bodies (1) and the transverse bars (2) are provided on their free surfaces with covers (4) which have a smooth outside and consist of a solder or another smooth-flowing, solidifying material. <IMAGE>

Description

Die Ertindung betrifft ein Verfahren zur Herstellung eines Spaltsiebes, welches insbesondere zur Verwendung in Anlagen zur sortierenden oder reinigenden Behandlung von wässrigen Faserstoffsuspensionen, z.B. bei der Papierherstellung, geeignet ist, bei welchem Verfahren an Querstäbe draht- oder stabförmige Langskörper angebracht werden, welche die Siebspalte begrenzen. Solche Spaltsiebe,worunter auch begrenzte kürzere Schlitzlängen oder unterbrochene Spalte aufweisende sogenannte Schlitzsiebe verstanden werden, kommen in verschiedenen Siebformen, z.B. als zylindrische Siebkörbe, Flachsiebe, Bogensiebe, Halbschalensiebe, Trommelsiebe oder dergl. vor.The invention relates to a process 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-like or rod-shaped long bodies are attached to cross bars, which limit the screen gaps. Such slotted screens, which are also understood to mean limited shorter slot lengths or so-called slot screens with interrupted gaps, come in different screen shapes, e.g. as cylindrical sieve baskets, flat sieves, curved sieves, half-shell sieves, drum sieves or the like.

Beider Papierherstellung werden solche Spaltsiebe u.a. in Sortierern, Rejectsortern und sog. Fraktionatoren eingesetzt. Die Sortierer dienen dazu, aus einer wässrigen Faserstoffsuspension, die in dieser Phase der Aufbereitung ca. 0,5 bis 4 % Fasern und etwa 96 bis 99,5% Wassergehalt hat, die darin enthaltenen Störstoffe, wie Verunreinigungsteilchen, zu entfernen, wahrend die Fraktionatoren dazu dienen, zwei Fraktionen mit verschieden langen Fasern voneinander zu trennen und die Langfasern am Sieb zurückzuhalten und getrennt abzuführen. Auch in Rejectsortern und Trommelsieben, welche bei Stoffdichten bis zu 20% arbeiten, werden derartige Siebe verwendet.In papermaking, such 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 fiber suspension, which in this phase of the treatment has about 0.5 to 4% fibers and about 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%.

In den bekannten Herstellungsverfahren für solche Spaltsiebe werden die Verbindungen zwischen Längskörpern und Querstäben zumeist durch Schweißen oder Herumschlingen erzeugt. Als Schweißverfahren kann z.B. das bekannte sogenannte Widerstandschweißen angewendet werden, bei dem an den Kontaktstellen ein elektrischer Strom die Schmelzwärme erzeugt. Aber auch andere Schweißverfahren sind grundsätzlich geeignet. Bei Schweißverbunden hat das Verfahren den Nachteil, daß die so erzeugten Siebe an ihren frei liegenden Oberflächen unerwünschte Gratbildung sowie unerwünschte Rauhigkeit, Vertiefungen, Spalte oder Erhebungen aufweisen. Auch bei Schlingverbindungen, bei denen die Längskörper um die Querstäbe herumgeschlungen werden, bilden sich Vertiefungen und Kanten. So kann es dazu kommen, daß bei Verwendung des Siebes Fasern aus der Faserstoffsuspension an den Verbindungen hängen bleiben können, wobei die Gefahr besteht, daß sich an diesen weitere Fasern anlegen und zusammenhängende Flocken, Spinnen oder Zöpfe bilden. Wenn sich nach einer gewissen Einsatzzeit des Spaltsiebes die so entstandenen Faserbündel vom Sieb ablösen und in den Durchlaufstoff hinter dem Sieb hineingespült werden, ist der gewünschte Sortiereffekt oder Fraktioniereffekt der Siebe nicht mehr gewährleistet. Dies ist bei der Papierherstellung höchst nachteilig, bei der es darauf ankommt, daß die Papierfasern in der Faserstoffsuspension vor deren Aufbringen auf das Entwässerungssieb in maximaler Weise vereinzelt sind und keine zusammenhängenden Flocken oder Verspinnungen bilden, welche die Qualitat des herzustellen den Papiers erheblich verschlechtern und zu Produktionsstörungen führen können. Es kann auch zu Verstopfungen des Sortiersiebes kommen.In the known manufacturing processes for such slotted sieves, the connections between longitudinal members and cross bars are mostly produced by welding or looping around. The known so-called resistance welding, for example, can be used as the welding process, in which an electrical current generates the heat of fusion at the contact points. However, other welding processes are also generally suitable. In the case of welded bonds, the method has the disadvantage that the sieves produced in this way have undesirable burrs on their exposed surfaces and have unwanted roughness, depressions, gaps or elevations. Even in the case of loop connections in which the longitudinal members are looped around the cross bars, depressions and edges are formed. So it can happen that when using the sieve fibers from the fiber suspension can get stuck to the connections, with the danger that further fibers attach to them and form coherent flakes, spiders or braids. If after a certain period of use of the slotted screen the resulting fiber bundles detach from the screen and are flushed into the continuous material behind the screen, the desired sorting or fractioning effect of the screens is no longer guaranteed. This is extremely disadvantageous in papermaking, in which it is important that the paper fibers in the pulp suspension are separated to a maximum extent before they are applied to the dewatering screen and do not form any coherent flakes or spunbands which considerably deteriorate and reduce the quality of the paper to be produced Can cause production disruptions. The sorting sieve can also become blocked.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung von Spaltsieben zu schaffen, das die Siebe an ihren Verbindungen derart gestaltet, daß die Gefahr des Hängenbleibens und damit des Verflockens und/oder Verspinnens der Fasern an den Spaltsieben sowie von Verstopfungen ganz oder weitgehend reduziert ist, und mit dem auch eine Erhöhung der Festigkeit an den Verbindungsstellen verbunden sein kann.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.

Dies wird erfindungsgemäß dadurch erreicht, daß die Verbindungen zwischen den Längskörpern und den Querstäben des Spaltsiebes an ihren nach dem Verbinden freiliegenden Oberflächen mit glatt geflossenem, erstarrten Material überdeckt werden, so daß nach Anwendung des Verfahrens die Verbindungsstellen an ihren freiliegenden Außenseiten mit eine glatte Oberfläche besitzenden Überdeckungen versehen sind. Dabei sollten diese Überdeckungen zweckmäßig an ihrer Außenseite glatt ausgerundet oder hohlkehlenförmig ausgebildet sein. Neben einem Löt-oder Schweißmaterial kommen also für die glatte Überdeckung der Verbindungen alle Medien in Frage, welche aufgrund ihrer Oberflächenspannung eine oberflächenglatte und unter Umstanden ausgerundete Überdeckung der Verbindung ergeben.This is achieved according to the invention in that the connections between the longitudinal bodies and the cross bars of the slotted screen are covered on their exposed surfaces after the connection with smoothly flowed, solidified material, so that after application of the method the 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. In addition to a soldering or welding material, all media are suitable for the smooth covering of the connections, which, due to their surface tension, may have a surface smooth and rounded under certain circumstances Coverage of the connection result.

Es kann auch das beim Schweißen bereits angeschmolzene und später gratbildend erstarrte Material zur Abdeckung verwendet werden, indem es nach dem eigentlichen Schweißvorgang erneut partiell erhitzt und erschmolzen wird, z.B. unter Schutzgas (sog. WIG-Lichtbogen).The material that has already melted during welding and later solidifies to form burrs 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).

Das erfindungsgemäß hergestellte Spaltsieb bietet den Vorteil, daß seine Festigkeit an der Verbindungsstelle erhöht wird (z.B.Verminderung der Kerbwirkung), was insbesondere wegen der dort im Betrieb auftretenden Wechsel belastung von Bedeutung ist. Durch die Wahl eines bei relativ niedriger Temperatur flie ßenden Materials im Vergleich zur Schmelztemperatur der Stäbe und Längskörper ergibt sich ein weiterer Vorteil. Die z.B. beim Löten notwendige relativ niedrige Temperatur bringt nur eine geringe Gefahr des Verziehens des Spaltsiebes mit sich, und die vorhandenen Verbindungen werden nicht mehr erweicht oder aufgeschmolzen.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 which flows at a relatively low temperature in comparison with the melting temperature of the rods and longitudinal members gives a further advantage. The e.g. The relatively low temperature required for soldering poses little risk of warping the slotted screen, and the existing connections are no longer softened or melted.

Das Verfahren zur Herstellung wird anhand von Zeichnungen erläutert. Es zeigen:

Figur 1:
den Schnitt durch eine erfindungsgemaß überdeckte Schweißverbindung,
Figur 2:
einen Teil eines Siebes mit nicht überdeckter Schweißverbindung,
Figur 3
: einen Teil eines Siebes mit überdeckter Schweißverbindung,
Figur 4:
einen Teil eines Siebes mit nicht überdeckter Schlingverbindung,
Figur 5:
einen Teil eines Siebes mit überdeckter Schlingverbindung.
Figur 6:
Schnitt durch eine nicht überdeckte Schweißverbindung.
Figur 7:
Schnitt durch eine gemaß Anspruch 10 oder 11 abgedeckte Schweißverbindung
The method for manufacturing is explained with reference to drawings. Show it:
Figure 1:
the section through a welded joint covered according to the invention,
Figure 2:
part of a sieve with an uncovered welded connection,
Figure 3
: part of a sieve with covered welded connection,
Figure 4:
part of a sieve with uncovered loop connection,
Figure 5:
part of a sieve with a covered loop connection.
Figure 6:
Cut through an uncovered welded joint.
Figure 7:
Section through a welded joint covered according to claim 10 or 11

In den Fig.2 und 3 ist jeweils als Ausschnitt eine besonders vorteilhafte Ausführungsform des erfindungsgemäßen Spaltsiebes in Schrägansicht dargestellt, die im folgenden näher beschrieben wird.2 and 3 each show a particularly advantageous embodiment of the slotted screen according to the invention in an oblique view, which is described in more detail below.

Das in der Zeichnung dargestellte Spaltsieb hat aus keilförmigen Profilstäben gebildete Längskörper 1,die an ihrer Unterseite durch im Querschnitt runde Querstäbe 2 miteinander verbunden sind, an welchen sie angeschweißt sind. Die Schweißverbindungen 3 zwischen den Profilstäben 1 und dem Querstab 2 haben noch im unfertigen Zustand unregelmäßige und unebene Oberflächen (Fig. 2). Die erfindungsgemäß auf die freiliegenden Bereiche dieser Oberflächen aufgebrachten Überdeckungen 4 aus Lot oder einem anderen glatt fließenden, erstarrenden Material sind in Fig.3 dargestellt. Diese Überdeckungen haben aufgrund der hohen Oberflächenspannung des Überdeckungsmaterial eine glatte Oberfläche, die insbesondere im Bereich ihres Anschlusses an die Umfangsfläche des Querstabes 2 glatt ausgerundet sind.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 profiled 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.

Aus Fig. 4 ist die an sich bekannte Verbindung durch Verschlingung der Profilstäbe 1 um die Querstäbe 2 erkennbar. Bei diesem Herstellungsverfahren können sich die Verbindungsstellen 3 für den Betrieb des Siebes ebenfalls nachteilig ausbilden, wie bereits anhand der Schweißnähte beschrieben. Vergleichbares gilt für die Stellen 5, welche für die genaue Distanz der Profilstäbe 1 von den jeweils benachbarten Profilstäben sorgen.The known connection can be seen from FIG. 4 by intertwining the profiled bars 1 around the transverse bars 2. In this production method, the 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.

Figur 5 zeigt den Erfindungsgegenstand gemäß dem Anspruch 3 bzw. den auf diesen Bezug nehmenden Ansprüchen. Die Überdeckungen 4 verschließendie nachteiligen Hohlräume an den Verbindungsstellen und decken Kanten und Grate ab.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.

Figur 7 erläutert insbesondere die Ansprüche 10 und 11. Es wird gezeigt, daß die Abdeckung 4 aus dem Material der vorher angebrachten Schweißnaht gebildet wird.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.

Claims (12)

Verfahren zur Herstellung eines Spaltsiebes, welches insbesondere zur Verwendung in Anlagen zur sortierenden oder reinigenden Behandlung von wässrigen Faserstoffsuspensionen, z.B. bei der Papierherstellung, geeignet ist, bei welchem Verfahren an Querstäbe (2) draht- oder stabförmige Längskörper (1) angebracht werden, welche die Siebspalte begrenzen, dadurch gekennzeichnet, daß die Verbindungen (3)zwischen den Längskörpern (1) und den Querstäben (2) an ihren freiliegenden Oberflächen mit glatt geflossenem, erstarrten Material überdeckt werden, so daß nach Anwendung des Verfahrens die Verbindungsstellen dort mit eine glatte Oberfläche besitzenden Überdeckungen (4) versehen sind.Process for producing a slotted screen, which is particularly suitable for use in systems for sorting or cleaning treatment of aqueous fiber suspensions, for example in papermaking, in which process wire or rod-shaped longitudinal members (1) are attached to cross bars (2), which the Limit screen gaps, characterized in that the connections (3) between the longitudinal members (1) and the crossbars (2) are covered on their exposed surfaces with smoothly flowing, solidified material, so that after application of the method, the connection points there with a smooth surface possessing overlaps (4) are provided. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die überdeckten Verbindungen (3) Schweißverbindungen sind.Method according to claim 1, characterized in that the covered connections (3) are welded connections. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Verbindungen (3)dadurch entstehen, daß die Längskörper (1) um die Querstäbe (2) herumgeschlungen werden, wobei zur Einhaltung eines gewünschten Spaltes Abstandshalter vorhanden sein können.Method according to Claim 1, characterized in that the connections (3) are formed by the longitudinal members (1) being looped around the transverse bars (2), with spacers being able to be provided to maintain a desired gap. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Überdeckungen (4) an ihrer Außenseite glatt ausgerundet sind.Method according to claim 1, characterized in that the overlaps (4) are smoothly rounded on their outside. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Überdeckungen (4) an ihrer Außenseite hohlkehlenförmig ausgebildet sind.Method according to claim 1, characterized in that the overlaps (4) are formed in the shape of a groove on the outside. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Überdeckungen (4) aus einem Material bestehen, das in flüssiger Form sich aufgrund seiner Oberflächenspannung auf den zu überdeckenden Flächen aufzieht.A method according to claim 5, characterized in that the coverings (4) consist of a material which is in liquid form due to its Surface tension builds up on the areas to be covered. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß auf die Verbindungen (3) zwischen den Längskörpern und den Querstäben Lot, duro-oder thermoplastische Kunststoffe oder dergl. glatt fließendes, erstarrendes Material überdeckend aufgebracht wird.A method according to claim 1, characterized in that solder, thermosetting or thermoplastic plastics or the like is applied to the connections (3) between the longitudinal members and the cross bars covering smoothly flowing, solidifying material. Verfahren nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß auf die Verbindungen (3) zwischen den Längskörpern und den Querstäben Pulver oder Paste aufgebracht wird, welches bzw. welche in einer nachfolgenden Behandlung verflüssigt wird und anschließend erstarrt, so daß daraus die Überdeckungen (4) gebildet werden.Method according to one or more of claims 1 to 7, characterized in that powder or paste is applied to the connections (3) between the longitudinal members and the transverse bars, which powder or liquefies in a subsequent treatment and then solidifies, so that from it the overlaps (4) are formed. Verfahren nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das glattflie ßende, erstarrende Material durch ein Tauchverfahren aufgebracht wird, bei dem vorher die nicht abzudeckenden Bereiche des Spaltsiebes mit einer das glattfließende Material abweisenden Schicht versehen sind.Method according to one or more of claims 1 to 7, characterized in that the smooth-flowing, solidifying material is applied by an immersion process in which the areas of the slotted screen not to be covered are previously provided with a layer which repels the smooth-flowing material. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Schweißverbindungen durch insbesondere kurzzeitiges Erwärmen an ihren Oberflächen so angeschmolzen werden,daß sich dort aus dem ursprünglichen Schweißmaterial die Überdeckungen (4) bilden.Method according to claim 2, characterized in that the welded connections are melted on their surfaces by in particular brief heating so that the overlaps (4) form there from the original welding material. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß das kurzzeitige Erwärmen durch einen kurzzeitig in unmittelbare Nähe der Verbindungen (3) gebrachten Lichtbogen erfolgt.Method according to Claim 10, characterized in that the brief heating takes place by means of an arc brought briefly into the immediate vicinity of the connections (3). Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Lichtbogen unter Schweiß-Schutzgas gebildet wird.A method according to claim 11, characterized in that the arc is formed under protective welding gas.
EP90121239A 1989-12-09 1990-11-07 Process for making a wedge wire Expired - Lifetime EP0432448B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90121239T ATE99749T1 (en) 1989-12-09 1990-11-07 PROCESS FOR MANUFACTURING A WIRE SCREEN.

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 true EP0432448A1 (en) 1991-06-19
EP0432448B1 EP0432448B1 (en) 1994-01-05

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EP90121239A Expired - Lifetime EP0432448B1 (en) 1989-12-09 1990-11-07 Process for making a wedge wire

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US (1) US5237154A (en)
EP (1) EP0432448B1 (en)
AT (1) ATE99749T1 (en)
CA (1) CA2030712A1 (en)
DE (1) DE59004134D1 (en)

Cited By (4)

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WO1997020104A1 (en) * 1995-11-28 1997-06-05 Ahlstrom Machinery Oy Method of manufacturing a wire screen product and a wire screen product
EP1745879A1 (en) * 2005-07-21 2007-01-24 Boll & Kirch Filterbau GmbH Methode of manufacturing wedge wire screens and product
EP2477710A1 (en) * 2009-09-14 2012-07-25 GEA Houle Inc. Liquid separating drum, separator provided with such a drum, and kit for assembling the same
DE102015003020B3 (en) * 2015-03-06 2016-03-03 Andritz Fiedler Gmbh bar screen basket

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EP0808941B1 (en) * 1996-05-24 2001-12-12 Voith Sulzer Stoffaufbereitung GmbH Process to make a screening apparatus having slotted apertures and screening apparatus obtained by this process
WO2001051168A1 (en) * 2000-01-07 2001-07-19 Kadant Black Clawson, Inc. Wedge wire screen cylinder and method of manufacturing the same
US6491168B1 (en) 2000-04-23 2002-12-10 J + L Fiber Services, Inc. Pulp screen basket
FR2809029B1 (en) * 2000-05-16 2002-06-21 Johnson Filtration Systems METHOD FOR MANUFACTURING A MECHANICAL FILTRATION BASKET
US6460757B1 (en) 2000-11-14 2002-10-08 Newscreen As Apparatus and method for forming slotted wire screens
CA2444486C (en) * 2001-04-16 2013-04-02 J & L Fiber Services, Inc. Screen cylinder and method
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 (en) * 2004-02-20 2005-09-02 Toyoda Mach Works Ltd Tig welding method for different kinds of metals and its welding structure
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
US9023456B2 (en) 2011-03-18 2015-05-05 Bilfinger Water Technologies, Inc. Profiled wire screen for process flow and other applications

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EP0287408A1 (en) * 1987-03-13 1988-10-19 E. et M. LAMORT Filter screens

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997020104A1 (en) * 1995-11-28 1997-06-05 Ahlstrom Machinery Oy Method of manufacturing a wire screen product and a wire screen product
EP1745879A1 (en) * 2005-07-21 2007-01-24 Boll & Kirch Filterbau GmbH Methode of manufacturing wedge wire screens and product
EP2477710A1 (en) * 2009-09-14 2012-07-25 GEA Houle Inc. Liquid separating drum, separator provided with such a drum, and kit for assembling the same
EP2477710A4 (en) * 2009-09-14 2013-03-13 Gea Houle Inc Liquid separating drum, separator provided with such a drum, and kit for assembling the same
DE102015003020B3 (en) * 2015-03-06 2016-03-03 Andritz Fiedler Gmbh bar screen basket
US10589196B2 (en) 2015-03-06 2020-03-17 Andritz Fiedler Gmbh Bar-type screen cage

Also Published As

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CA2030712A1 (en) 1991-06-10
US5237154A (en) 1993-08-17
DE59004134D1 (en) 1994-02-17
EP0432448B1 (en) 1994-01-05
ATE99749T1 (en) 1994-01-15

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