EP0523313B1 - Element for screen - Google Patents
Element for screen Download PDFInfo
- Publication number
- EP0523313B1 EP0523313B1 EP92102068A EP92102068A EP0523313B1 EP 0523313 B1 EP0523313 B1 EP 0523313B1 EP 92102068 A EP92102068 A EP 92102068A EP 92102068 A EP92102068 A EP 92102068A EP 0523313 B1 EP0523313 B1 EP 0523313B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieve
- rods
- gap
- screen
- parallel
- 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
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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
Definitions
- the invention relates to a sieve element, in particular for sorting / classifying, in particular fiber suspensions, consisting of a plurality of parallel rods connected to one another by cross bars, which form a sieve surface, between which slit-shaped sieve gaps are formed, which run essentially transversely to the main inflow direction of the fiber suspension , and furthermore each rod is provided with flat side surfaces which adjoin the end face and extend transversely to the sieve surface and form the sieve gap of two adjacent rods.
- Such a screen element is known from DE-A-33 27 422.
- the object of the invention is now to further reduce the wear on the rods and thereby further increase the service life of the rods.
- this is achieved in that the side walls delimiting the screen gap run parallel and so are formed so that - seen in the direction of flow through the screen gap - the downstream edge C of the side wall of the preceding rod lies in front of the downstream edge B of the side wall of the following rod.
- the depth of the screen gap delimited by the parallel side walls or in other words the overlap of the parallel side surfaces of the bars delimiting the screen gap is approximately 0.2-0.8, in particular approximately 0.5 mm.
- the distance T measured in the direction of flow through the screen gap between the downstream edge C of the preceding bar and the downstream edge B of the following bar is preferably approximately 1.0-2.0 times and in particular approximately 1.0-1.5 times the parallel overlap Ü of the two bars.
- the parallel side surfaces are followed by inclined side surfaces, which form an acute angle of approximately 10-25 ° to a perpendicular to the screen surface, the angle ⁇ 1 preferably being approximately 15 ° and the angle ⁇ 2 preferably being approximately 20 °.
- the end face of the rods can run parallel to the sieve surface, but preferably it runs at an acute angle ⁇ to the sieve surface, which can be approximately 10-30 °, in particular approximately 15 °.
- the figure shows two adjacent rods 12 which form part of a sieve element, for example a sieve basket.
- the central axes 44 of the two rods 12 run at an angle of 90 ° to the sieve surface 22 of the sieve basket, which is otherwise not shown.
- the end faces 18 of the rods can run parallel to the sieve surface 22, but in the embodiment shown they form an acute angle ⁇ to the sieve surface 22, which can be approximately 10-30 °, preferably approximately 15 °.
- the two rods 12 are delimited on their two longitudinal sides by two flat side surfaces 24 and 26 which extend from the ends of their end surfaces 18 and extend in the direction of the flow direction of the screen gap 16 indicated by the arrow P.
- the two side surfaces 24 and 26 run transversely to the screen surface 22 and thus parallel to the central planes 44 of the bars 12 and parallel to the central plane 38 of the screen gap 16, which is formed between the two adjacent bars 12.
- the rods 12 are also each delimited by two side surfaces 28 and 30, which form the angles ⁇ 1 and ⁇ 2 with a perpendicular to the screen surface 22 and thus also with the central planes 44 and the central plane 38.
- the screen gap is limited by the side surface 26 of the left rod 12, the side surface 24 of the right rod 12, which run parallel to each other, and by the side surface 30 of the left rod 12 and the side surface 28 of the right rod 12, which the aforementioned angles ⁇ 1 and ⁇ 2 form the central plane 38 of the screen gap 16.
- the parallel surfaces 24 and 26 delimiting the screen gap 16 are offset from one another in the flow direction P.
- the side surface 26 is offset in the flow direction P against the side surface 24.
- the two side surfaces 24 and 26, which delimit and form the screen gap 16 overlap by the dimension U, whereby, as the figure shows, the edge A of the left bar (formed by the intersection of the surfaces 26 and 18) before the edge C (formed by the intersection of the surfaces 28 and 24) of the right rod 12 lies.
- the parallel screen gap 16 thus extends in the flow direction P from the edge A of the left rod 12 to the edge C of the right rod 12.
- the overlap Ü can be a few tenths of a millimeter to approximately 1 millimeter, preferably approximately 0.2-0.8 mm and particularly preferably approximately 0.5 mm, viewed in the flow direction P.
- the side surface 26 of the left rod 12 (which is the following rod in relation to the direction of rotation of the rotor indicated by the arrow) extends further in the direction of the arrow P than the side surface 24 of the right rod 12 (which relates to FIG the working direction of the rotor indicated by the arrow is the preceding rod).
- the downstream edge B of the left rod 12 (formed by the intersection of the surfaces 26 and 30) extends by the dimension T further in the direction of the flow direction of the screen gap 16 indicated by the arrow P than the downstream edge C of the right rod 12, which is formed by the intersection of the side surfaces 24 and 28 of the right rod 12.
- the dimension T can be approximately 1.0-2.0 times and in particular approximately 1.0-1.5 times the overlap Ü of the two parallel side surfaces 24 and 26. (If the end faces 18 of the rods 12, which is not shown here, run parallel to the sieve surface 22, then the side surface 26 of the left rod 12, viewed in the direction of flow P, is longer by the dimension T than the side surface 24 of the right rod 12) .
- the gap width of the screen gap 16 remains constant until the edge A, that is to say the cutting line between the surfaces 18 and 26, comes to lie deeper than the edge C.
- the gap width also only increases here with further wear slowly, because there is also the surface 26 of the left rod 12, which is also parallel to the central plane 38 and extends to the downstream edge B.
- the screen gap is therefore only widened due to the inclination of the surface 28 of the right rod 12. The widening of the screen gap is thus reduced by the side surface 26, which forms a wear surface and runs parallel to the direction of flow.
- the angles ⁇ 1 and ⁇ 2 are preferably about 15 °. Increasing the angle ⁇ 2 to about 20 ° leads to a somewhat faster expansion of the screen gap, but it has been shown that the flow resistance could be reduced as a result.
- the bar width b can be approximately 1.5-4 mm and the bar height H approximately 2.5-7 mm.
- the height h results from the bar width B and the angle ⁇ .
- the gap width of the screen gap is approximately in the range from 0.05 to approximately 1 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combined Means For Separation Of Solids (AREA)
- Paper (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Die Erfindung betrifft ein Siebelement, insbesondere zum Sortieren/Klassieren, insbesondere von Fasersuspensionen, bestehend aus einer Mehrzahl von parallelen, miteinander durch Querstäbe verbundenen Stäben, die eine Siebfläche bilden, zwischen denen schlitzförmige Siebspalte gebildet sind, die im wesentlichen quer zur Hauptanströmrichtung der Fasersuspension verlaufen, und ferner jeder Stab mit sich an die Stirnfläche anschließenden, quer zur Siebfläche verlaufenden ebenen Seitenflächen versehen ist, die den Siebspalt zweier benachbarter Stäbe bilden.The invention relates to a sieve element, in particular for sorting / classifying, in particular fiber suspensions, consisting of a plurality of parallel rods connected to one another by cross bars, which form a sieve surface, between which slit-shaped sieve gaps are formed, which run essentially transversely to the main inflow direction of the fiber suspension , and furthermore each rod is provided with flat side surfaces which adjoin the end face and extend transversely to the sieve surface and form the sieve gap of two adjacent rods.
Ein derartiges Siebelement ist aus der DE-A-33 27 422 bekannt.Such a screen element is known from DE-A-33 27 422.
Die Abnutzung der Kanten an den Stäben im Bereich des Siebspaltes führt bei Verschleiß schnell zu einer größeren Spaltweite und damit zu einer Verschlechterung der Sortierqualität.
Um dies zu reduzieren, ist bereits vorgeschlagen worden, den Siebspalt durch parallele Seitenwände zu begrenzen, die quer zur Siebfläche verlaufen.
Hierdurch konnte der Verschleiß verringert und die Lebensdauer der Stäbe bereits deutlich gesteigert werden gegenüber Stäben mit etwa dreieckförmigem Querschnitt, deren Siebspalt durch divergierende Wände begrenzt wird.The wear of the edges on the bars in the area of the screen gap quickly leads to a larger gap width when worn and thus to a deterioration in the sorting quality.
In order to reduce this, it has already been proposed to limit the screen gap by means of parallel side walls which run transversely to the screen surface.
As a result, wear was reduced and the lifespan of the rods was already significantly increased compared to rods with an approximately triangular cross-section, the sieve gap of which is limited by diverging walls.
Aufgabe der Erfindung ist es nun, den Verschleiß an den Stäben weiter zu reduzieren und dadurch die Lebensdauer der Stäbe weiter zu steigern.The object of the invention is now to further reduce the wear on the rods and thereby further increase the service life of the rods.
Nach der Erfindung wird dies dadurch erreicht, daß die den Siebspalt begrenzenden, Seitenwände parallel verlaufen und so ausgebildet sind, daß - gesehen in Durchströmungsrichtung des Siebspaltes - die stromabwärtige Kante C der Seitenwand des vorausgehenden Stabes vor der stromabwärtigen Kante B der Seitenwand des nachfolgenden Stabes liegt.According to the invention, this is achieved in that the side walls delimiting the screen gap run parallel and so are formed so that - seen in the direction of flow through the screen gap - the downstream edge C of the side wall of the preceding rod lies in front of the downstream edge B of the side wall of the following rod.
Die Tiefe des durch die parallelen Seitenwände begrenzten Siebspaltes oder mit anderen Worten die Überdeckung der den Siebspalt begrenzenden parallelen Seitenflächen der Stäbe liegt bei etwa 0,2 - 0,8, insbesondere bei etwa 0,5 mm.
Der in Durchströmungsrichtung des Siebspaltes gemessene Abstand T zwischen der stromabwärtigen Kante C des vorausgehenden Stabes und der stromabwärtigen Kante B des nachfolgenden Stabes beträgt vorzugsweise etwa das 1,0 - 2,0fache und insbesondere etwa das 1,0 - 1,5fache der parallelen Überdeckung Ü der beiden Stäbe.
Zweckmäßigerweise schließen sich an die parallelen Seitenflächen schräg verlaufende Seitenflächen an, die zu einer Senkrechten auf die Siebfläche einen spitzen Winkel von etwa 10 - 25° bilden, wobei der Winkel φ₁ vorzugsweise bei etwa 15° und der Winkel φ₂ vorzugsweise bei etwa 20° liegt.The depth of the screen gap delimited by the parallel side walls or in other words the overlap of the parallel side surfaces of the bars delimiting the screen gap is approximately 0.2-0.8, in particular approximately 0.5 mm.
The distance T measured in the direction of flow through the screen gap between the downstream edge C of the preceding bar and the downstream edge B of the following bar is preferably approximately 1.0-2.0 times and in particular approximately 1.0-1.5 times the parallel overlap Ü of the two bars.
Advantageously, the parallel side surfaces are followed by inclined side surfaces, which form an acute angle of approximately 10-25 ° to a perpendicular to the screen surface, the angle φ₁ preferably being approximately 15 ° and the angle φ₂ preferably being approximately 20 °.
Die Stirnfläche der Stäbe kann parallel zur Siebfläche verlaufen, vorzugsweise verläuft sie aber in einem spitzen Winkel β zur Siebfläche, der etwa 10 - 30°, insbesondere etwa 15° betragen kann.The end face of the rods can run parallel to the sieve surface, but preferably it runs at an acute angle β to the sieve surface, which can be approximately 10-30 °, in particular approximately 15 °.
Eine beispielsweise Ausführungsform der Erfindung wird nachfolgend anhand der einzigen Figur der Zeichnung erläutert, die im Schnitt zwei benachbarte Stäbe des erfindungsgemäßen Siebelementes zeigt, zwischen denen ein Siebspalt ausgebildet ist.An example embodiment of the invention is explained below with reference to the single figure of the drawing, which shows in section two adjacent bars of the screen element according to the invention, between which a screen gap is formed.
Die Figur zeigt zwei benachbarte Stäbe 12, die Teil eines Siebelementes z.B. eines Siebkorbes bilden. Die Mittelachsen 44 der beiden Stäbe 12 verlaufen in einem Winkel von 90° zur Siebfläche 22 des im übrigen nicht dargestellten Siebkorbes.
Die Stirnflächen 18 der Stäbe können parallel zu der Siebfläche 22 verlaufen, in der dargestellten Ausführungsform bilden sie jedoch einen spitzen Winkel β zur Siebfläche 22, der etwa 10 - 30°, vorzugsweise etwa 15° betragen kann.The figure shows two
The end faces 18 of the rods can run parallel to the
Die beiden Stäbe 12 sind an ihren beiden Längsseiten durch zwei ebene Seitenflächen 24 und 26 begrenzt, die von den Enden ihrer Stirnflächen 18 ausgehen und sich in Richtung der durch den Pfeil P angegebenen Durchströmungsrichtung des Siebspaltes 16 erstrecken.
Die beiden Seitenflächen 24 und 26 verlaufen quer zur Siebfläche 22 und damit parallel zu den Mittelebenen 44 der Stäbe 12 und parallel zur Mittelebene 38 des Siebspaltes 16, der zwischen den beiden benachbarten Stäben 12 gebildet ist. Die Stäbe 12 werden darüber hinaus jeweils durch zwei Seitenflächen 28 und 30 begrenzt, die mit einer Senkrechten auf die Siebfläche 22 und damit auch mit den Mittelebenen 44 und der Mittelebene 38 die Winkel φ₁ und φ₂ bilden.
Der Siebspalt wird begrenzt durch die Seitenfläche 26 des linken Stabes 12, die Seitenfläche 24 des rechten Stabes 12, die parallel zueinander verlaufen, sowie durch die Seitenfläche 30 des linken Stabes 12 und die Seitenfläche 28 des rechten Stabes 12, welche die vorgenannten Winkel φ₁ und φ₂ zur Mittelebene 38 des Siebspaltes 16 bilden.The two
The two
The screen gap is limited by the
Bei der in der Zeichnung dargestellten Ausführungsform der Erfindung sind die den Siebspalt 16 begrenzenden parallelen Flächen 24 und 26 in Strömungsrichtung P versetzt zueinander angeordnet, wobei die Seitenfläche 26 in Strömungsrichtung P versetzt gegen die Seitenfläche 24 ist.
Die beiden Seitenflächen 24 und 26, die den Siebspalt 16 begrenzen und bilden, überlappen sich jedoch um das Maß Ü, wobei, wie die Figur zeigt, die Kante A des linken Stabes (gebildet durch den Schnitt der Flächen 26 und 18) vor der Kante C (gebildet durch den Schnitt der Flächen 28 und 24) des rechten Stabes 12 liegt.
Der parallele Siebspalt 16 erstreckt sich somit in Strömungsrichtung P gesehen von der Kante A des linken Stabes 12 bis zur Kante C des rechten Stabes 12.
Die Überlappung Ü kann wenige Zehntel Millimeter bis etwa 1 Millimeter, vorzugsweise etwa 0,2 - 0,8 mm und besonders bevorzugt etwa 0,5 mm betragen, gesehen in Strömungsrichtung P.In the embodiment of the invention shown in the drawing, the
However, the two
The parallel screen gap 16 thus extends in the flow direction P from the edge A of the
The overlap Ü can be a few tenths of a millimeter to approximately 1 millimeter, preferably approximately 0.2-0.8 mm and particularly preferably approximately 0.5 mm, viewed in the flow direction P.
Wie die Figur zeigt, erstreckt sich nun die Seitenfläche 26 des linken Stabes 12 (der bezogen auf die durch den Pfeil angegebene Drehrichtung des Rotors der nachfolgende Stab ist) in Richtung des Pfeiles P weiter als die Seitenfläche 24 des rechten Stabes 12 (der bezogen auf die durch den Pfeil gegebene Arbeitsrichtung des Rotors der vorangehende Stab ist).
Mit anderen Worten, die stromabwärtige Kante B des linken Stabes 12 (gebildet durch den Schnitt der Flächen 26 und 30) erstreckt sich um das Maß T weiter in Richtung der durch den Pfeil P angezeigten Durchströmungsrichtung des Siebspaltes 16 als die stromabwärtige Kante C des rechten Stabes 12, die durch den Schnitt der Seitenflächen 24 und 28 des rechten Stabes 12 gebildet wird.
Das Maß T kann hierbei etwa das 1,0 - 2,0fache und insbesondere etwa das 1,0 - 1,5fache der Überlappung Ü der beiden parallelen Seitenflächen 24 und 26 betragen.
(Wenn die Stirnflächen 18 der Stäbe 12, was hier nicht dargestellt ist, parallel zur Siebfläche 22 verlaufen, so ist die Seitenfläche 26 des linken Stabes 12, gesehen in Durchströmungsrichtung P, um das Maß T länger als die Seitenfläche 24 des rechten Stabes 12).As the figure shows, the
In other words, the downstream edge B of the left rod 12 (formed by the intersection of the
The dimension T can be approximately 1.0-2.0 times and in particular approximately 1.0-1.5 times the overlap Ü of the two
(If the end faces 18 of the
Es hat sich gezeigt, daß das Verschleißverhalten der Stäbe 12 im Bereich des Siebspaltes durch die asymmetrische Ausbildung der den Siebspalt begrenzenden parallelen Seitenflächen 24 und 26 verbessert und die Lebensdauer der Stäbe (das heißt ihre Verwendungsdauer) um ca. 15 % - 20 % gesteigert werden kann gegenüber solchen Stäben, bei denen der Siebspalt durch zwei parallele, gleich lange und nicht versetzte Seitenwände begrenzt ist.It has been shown that the wear behavior of the
Bei einem Verschleiß der Kante A bleibt die Spaltweite des Siebspaltes 16 solange konstant, bis die Kante A, das heißt die Schnittlinie zwischen den Flächen 18 und 26, tiefer zu liegen kommt als die Kante C. Bei weiterem Verschleiß nimmt die Spaltweite aber auch hier nur langsam zu, weil auch die weiterhin zur Mittelebene 38 parallele Fläche 26 des linken Stabes 12 vorhanden ist, die sich bis zur stromabwärtigen Kante B erstreckt. Bei einem weiteren Verschleiß erfolgt deshalb nur eine Erweiterung des Siebspaltes infolge der Neigung der Fläche 28 des rechten Stabes 12.
Durch die Seitenfläche 26, die eine Verschleißfläche bildet und parallel zur Strömungsrichtung verläuft, wird somit die Aufweitung des Siebspaltes reduziert.
Die Winkel φ₁ und φ₂ liegen vorzugsweise bei etwa 15°. Eine Vergrößerung des Winkels φ₂ auf etwa 20° führt zwar zu einer etwas schnelleren Aufweitung des Siebspaltes, es hat sich aber gezeigt, daß der Strömungswiderstand hierdurch reduziert werden konnte.If the edge A wears, the gap width of the screen gap 16 remains constant until the edge A, that is to say the cutting line between the
The widening of the screen gap is thus reduced by the
The angles φ₁ and φ₂ are preferably about 15 °. Increasing the angle φ₂ to about 20 ° leads to a somewhat faster expansion of the screen gap, but it has been shown that the flow resistance could be reduced as a result.
Bei der dargestellten Ausführungsform kann die Stabbreite b etwa 1,5 - 4 mm und die Stabhöhe H etwa 2,5 - 7 mm betragen. Die Höhe h ergibt sich aus der Stabbreite B und dem Winkel β.In the embodiment shown, the bar width b can be approximately 1.5-4 mm and the bar height H approximately 2.5-7 mm. The height h results from the bar width B and the angle β.
Die Spaltweite des Siebspaltes liegt etwa im Bereich von 0,05 bis etwa 1 mm.The gap width of the screen gap is approximately in the range from 0.05 to approximately 1 mm.
Claims (8)
- Sieve element or sieve basket, particularly for sorting/grading in particular fibre suspensions, consisting of a plurality of parallel rods (12) connected to one another by means of transverse rods and forming a sieve surface (22) between which slot-like sieve gaps (16) are formed which extend essentially transversely to the main direction of flow (3) of the fibre suspension, wherein each rod (12) is provided with flat side faces (24, 26) extending transversely to the sieve surface and connected to its end face (18) and which form the sieve gap (16) of two neighbouring rods (12), characterised in that the side faces (24, 26) of the rods (12) defining the sieve gap (16) extend in parallel in the flow direction (7) of the sieve gap (16) and are designed so that at sieve gap (16) the outlet edge (C) of the side face (24) of the preceding rod (12) lies in front of the outlet edge (B) of the side face (26) of the subsequent rod (12).
- Sieve element according to claim 1, characterised in that the cover (U) of the parallel side faces (24, 26) of the rods (12) defining the sieve gap (16) is about 0.2 - 0.8, in particular about 0.5 mm.
- Sieve element according to claim 2, characterised in that the distance (T) between the outlet edge (C) of the preceding rod (12) and the outlet edge (B) of the subsequent rod (12) measured in the flow direction of the sieve gap (16) is about 1.0 - 1.2 times, in particular about 1.0 - 1.5 times, the cover (U).
- Sieve element according to one of claims 1 - 3, characterised in that side faces (28, 30) extending at an angle on the parallel side faces (24, 26) of the rods (12) are added and form an acute angle (φ₁) or (φ₂) to a vertical on the sieve surface (22).
- Sieve element according to claim 4, characterised in that the angle (φ₁) is about 10 - 25°, preferably about 15°.
- Sieve element according to claim 4, characterised in that the angle (φ₂) is about 10 - 25°, preferably about 20°.
- Sieve element according to one of the preceding claims, characterised in that the end face (18) of the rods (12) extends at an acute angle (β) to the sieve surface (22).
- Sieve element according to claim 7, characterised in that the angle (β) between the sieve surface (22) and the end face (18) of the rods is about 10 - 30°, in particular about 15°.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4121897A DE4121897A1 (en) | 1991-07-02 | 1991-07-02 | SCREEN ELEMENT |
| DE4121897 | 1991-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0523313A1 EP0523313A1 (en) | 1993-01-20 |
| EP0523313B1 true EP0523313B1 (en) | 1995-11-29 |
Family
ID=6435271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92102068A Expired - Lifetime EP0523313B1 (en) | 1991-07-02 | 1992-02-07 | Element for screen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5255790A (en) |
| EP (1) | EP0523313B1 (en) |
| AT (1) | ATE130889T1 (en) |
| CA (1) | CA2072771C (en) |
| DE (2) | DE4121897A1 (en) |
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| DE102012217579A1 (en) | 2012-09-27 | 2014-03-27 | Skz - Kfe Ggmbh Kunststoff-Forschung Und -Entwicklung | Feeder for feeding fibers in the production of fiber reinforced plastics |
| DE212015000246U1 (en) | 2014-10-14 | 2017-05-19 | Aikawa Fiber Technologies Trust | screen cylinder |
| AU2016318341A1 (en) * | 2015-09-08 | 2018-02-15 | Schenck Process Australia Pty Ltd | Screening panel |
| US20200147646A1 (en) * | 2017-07-20 | 2020-05-14 | Aqseptence Group Pty Ltd | A screen |
| DE102018005307B3 (en) * | 2018-07-04 | 2019-06-06 | Andritz Fiedler Gmbh | screening device |
| CN111035983B (en) * | 2020-01-06 | 2024-07-05 | 湖南三友环保科技有限公司 | A filter equipment that is arranged in biological diatomaceous earth mixed solution impurity to get rid of |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US703683A (en) * | 1902-02-21 | 1902-07-01 | Nathaniel L Vrooman | Screen-plate for pulp-strainers. |
| FR631856A (en) * | 1926-12-21 | 1927-12-28 | Sieve in profiled metal bars or wires | |
| GB291530A (en) * | 1927-03-04 | 1928-06-05 | Hermann Schubert | Improvements in or relating to sieves |
| DE658759C (en) * | 1935-04-18 | 1938-04-12 | Hermann Schubert | Profile bars for setting material carriers in setting machines, especially air setting machines |
| GB450534A (en) * | 1935-07-26 | 1936-07-21 | George William Mensforth | Improvements in and relating to filtering apparatus |
| DE969759C (en) * | 1955-05-03 | 1958-07-17 | Brueckenbau Flender G M B H | Profile bar for sieve floors |
| DE2460167C3 (en) * | 1974-12-19 | 1983-11-17 | Krauss-Maffei AG, 8000 München | Slotted sieve with exchangeable sieve bars |
| US4113626A (en) * | 1975-09-19 | 1978-09-12 | The Black Clawson Company | Dewatering screen |
| US4396503A (en) * | 1981-08-10 | 1983-08-02 | Hein Lehmann Ag | Method and device for coating elements and screen elements made thereby |
| DE3327422C2 (en) * | 1983-07-29 | 1995-03-16 | Voith Gmbh J M | Sieve, in particular for sorting fiber suspensions based on waste paper |
| FR2572950B1 (en) * | 1984-11-12 | 1987-01-23 | Lamort E & M | IMPROVEMENTS ON SCREENS FOR CLEANERS AND THEIR MANUFACTURE |
| DE3816152A1 (en) * | 1987-11-14 | 1989-11-23 | Voith Gmbh J M | SCREEN BASKET AND METHOD FOR THE PRODUCTION THEREOF |
| DE3927748C2 (en) * | 1989-08-23 | 1994-03-10 | Voith Gmbh J M | Process for producing a screen basket and screen basket produced according to this method |
| DE9108129U1 (en) * | 1991-07-02 | 1991-09-05 | Heinrich Fiedler GmbH & Co. KG, 8400 Regensburg | Sieve element |
-
1991
- 1991-07-02 DE DE4121897A patent/DE4121897A1/en not_active Withdrawn
-
1992
- 1992-01-23 US US07/824,365 patent/US5255790A/en not_active Expired - Lifetime
- 1992-02-07 AT AT92102068T patent/ATE130889T1/en not_active IP Right Cessation
- 1992-02-07 DE DE59204473T patent/DE59204473D1/en not_active Expired - Fee Related
- 1992-02-07 EP EP92102068A patent/EP0523313B1/en not_active Expired - Lifetime
- 1992-06-30 CA CA002072771A patent/CA2072771C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5255790A (en) | 1993-10-26 |
| CA2072771A1 (en) | 1993-01-03 |
| CA2072771C (en) | 2005-05-10 |
| ATE130889T1 (en) | 1995-12-15 |
| EP0523313A1 (en) | 1993-01-20 |
| DE4121897A1 (en) | 1993-01-07 |
| DE59204473D1 (en) | 1996-01-11 |
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