EP0432448B1 - Process for making a wedge wire - Google Patents
Process for making a wedge wire 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.
Abstract
Description
Die Erfindung 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. Ein solches Verfahren ist aus der Druckschrift EP-A-0 287 408The 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. Such a method is known from EP-A-0 287 408
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.Such 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.
Bei der 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 paper production, 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 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%.
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 production 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 method, 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 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 in the maximum way 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 members 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 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.
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 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).
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 fließenden 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 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.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind gegenstand der Ansprüche 2 bis 12Further advantageous embodiments of the invention are the subject of
Das Verfahren zur Herstellung wird anhand von Zeichnungen erläutert. Es zeigen:
- Figur 1:
- den Schnitt durch eine erfindungsgemäß 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 gemäß Anspruch 10 oder 11 abgedeckte Schweißverbindung
- 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 connection 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
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.From Fig. 4 the known connection can be seen by intertwining the
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
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
Claims (12)
- A method of producing a bar screen, which is more especially suitable for use in installations for the sorting or cleaning treatment of aqueous suspensions of fibrous material, e.g. when making paper, in which method wire-shaped or bar-shaped longitudinal bodies (1) which define the screen gaps are applied to transverse rods (2), characterised in that the joints (3) between the longitudinal bodies (1) and the transverse rods (2) are covered at their exposed surfaces with solidified material which has flowed smoothly, so that after use of the method the joints are provided there with coverings (4) possessing a smooth surface.
- A method according to claim 1, characterised in that the joints (3) are welded joints.
- A method according to claim 1, characterised in that the joints (3) come about in that the longitudinal bodies (1) are wound around the transverse rods (2), in which respect distance pieces may be present for adherence to a desired gap.
- A method according to claim 1, characterised in that the coverings (4) are smoothly rounded off on their outside.
- A method according to claim 1, characterised in that the coverings (4) are flute-shaped on their outside.
- A method according to claim 5, characterised in that the coverings (4) consist of a material which in liquid form by reason of its surface tension attaches itself to the surfaces that are to be covered.
- A method according to claim 1, characterised in that solder, thermosetting plastics or thermoplastics or similar smoothly flowing, solidifying material is applied in a covering manner to the joints (3) between the longitudinal bodies and the transverse rods.
- A method according to any one or more of claims 1 to 7, characterised in that powder or paste, which in a subsequent treatment is liquefied and then solidified, so that the coverings (4) are formed therefrom, is applied to the joints (3) between the longitudinal bodies and the transverse rods.
- A method according to any one or more of claims 1 to 7, characterised in that the smoothly flowing, solidifying material is applied by a dipping process, in which those regions of the bar screen which are not to be covered are previously provided with a layer which repels the smoothly flowing material.
- A method according to claim 2, characterised in that the welded joints are incipiently melted by in particular short-time heating at their surfaces in such a way that the coverings (4) are formed there from the original welding material.
- A method according to claim 10, characterised in that the short-time heating is effected by an arc brought for a short time into the immediate vicinity of the joints (3).
- A method according to claim 11, characterised in that the arc is formed under gas shielding.
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 EP0432448A1 (en) | 1991-06-19 |
| EP0432448B1 true EP0432448B1 (en) | 1994-01-05 |
Family
ID=6395127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90121239A Expired - Lifetime EP0432448B1 (en) | 1989-12-09 | 1990-11-07 | Process for making a wedge wire |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5237154A (en) |
| EP (1) | EP0432448B1 (en) |
| AT (1) | ATE99749T1 (en) |
| CA (1) | CA2030712A1 (en) |
| DE (1) | DE59004134D1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI100344B (en) | 1995-11-28 | 1997-11-14 | Ahlstrom Machinery Oy | Process for making a sieve product and sieve product |
| ATE210756T1 (en) * | 1996-05-24 | 2001-12-15 | Voith Sulzer Stoffaufbereitung | METHOD FOR PRODUCING A SCREENING DEVICE WITH GAP-SHAPED OPENINGS AND SCREENING DEVICE PRODUCED THEREFROM |
| 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 |
| CA2802168A1 (en) * | 2001-04-16 | 2002-10-24 | 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 |
| DE102005034789A1 (en) * | 2005-07-21 | 2007-01-25 | Boll & Kirch Filterbau Gmbh | Method for producing metallic gap filters, method for producing metallic canned filters and canned filters |
| 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 (en) * | 2009-09-14 | 2011-03-14 | Gea Houle Inc. | Separator with horizontal rotary screen |
| US9023456B2 (en) | 2011-03-18 | 2015-05-05 | Bilfinger Water Technologies, Inc. | Profiled wire screen for process flow and other applications |
| DE102015003020B3 (en) * | 2015-03-06 | 2016-03-03 | Andritz Fiedler Gmbh | bar screen basket |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR329445A (en) * | 1903-02-20 | 1903-07-30 | Carriere H | Improvements to pulp cleaning devices |
| US3370150A (en) * | 1965-07-07 | 1968-02-20 | Leonard Concrete Pipe Company | Welding apparatus and method |
| DE1760694A1 (en) * | 1968-06-21 | 1971-03-11 | Kufferath Antonius | Screen cloth and process for its manufacture |
| BE792211A (en) * | 1971-12-03 | 1973-06-01 | Rech Des Etats De Surface Cent | FILTER ELEMENT |
| 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 (en) * | 1987-03-13 | 1991-02-08 | Lamort E & M | IMPROVEMENT IN SCREENS FOR PURIFIER AND THEIR MANUFACTURE |
| DE8910605U1 (en) * | 1989-09-06 | 1989-10-26 | Steinhaus Gmbh, 4330 Muelheim, De |
-
1990
- 1990-11-07 DE DE90121239T patent/DE59004134D1/en not_active Expired - Fee Related
- 1990-11-07 AT AT90121239T patent/ATE99749T1/en not_active IP Right Cessation
- 1990-11-07 EP EP90121239A patent/EP0432448B1/en not_active Expired - Lifetime
- 1990-11-27 CA CA002030712A patent/CA2030712A1/en 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 |
|---|---|
| DE59004134D1 (en) | 1994-02-17 |
| CA2030712A1 (en) | 1991-06-10 |
| US5237154A (en) | 1993-08-17 |
| EP0432448A1 (en) | 1991-06-19 |
| ATE99749T1 (en) | 1994-01-15 |
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