[go: up one dir, main page]

EP1876289B1 - Method for separating impurities from a fibrous suspension - Google Patents

Method for separating impurities from a fibrous suspension Download PDF

Info

Publication number
EP1876289B1
EP1876289B1 EP07008488A EP07008488A EP1876289B1 EP 1876289 B1 EP1876289 B1 EP 1876289B1 EP 07008488 A EP07008488 A EP 07008488A EP 07008488 A EP07008488 A EP 07008488A EP 1876289 B1 EP1876289 B1 EP 1876289B1
Authority
EP
European Patent Office
Prior art keywords
stream
return flow
piece
pipe
pressure screen
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.)
Not-in-force
Application number
EP07008488A
Other languages
German (de)
French (fr)
Other versions
EP1876289A1 (en
Inventor
Georg Jäger
Reimund Rienecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1876289A1 publication Critical patent/EP1876289A1/en
Application granted granted Critical
Publication of EP1876289B1 publication Critical patent/EP1876289B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • D21D5/26—De-aeration of paper stock
    • 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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • Such a method is for example off EP-A-1 184 509 known.
  • Such a separation process serves to remove undesired accompanying substances, so-called impurities, in particular from a fiber suspension suitable for paper production.
  • pulp suspensions to be used for papermaking especially those recovered from waste paper, often contain a greater or lesser amount of impurities which must be removed in the processing plant.
  • Screening apparatuses which are called sorters or pressure sorters have proved particularly suitable for this purpose.
  • the suspension on a sieve is divided into at least two fractions, one that contains the substances that have passed through the sieve and one that overflows with the substances that have been rejected because of their size.
  • the fibers get into the pass as purified accepts suspension. It is also the abundant water is preferably in the flow, so that the overflow is thickened.
  • the invention is based on the object to provide a reliable method, can be returned to the return streams easily and easily in the pressure sorter.
  • the return flow is diverted as recirculation from the overflow stream.
  • Such return flow improves the safe operation of the pressure sorter. It is favorable that the overflow can be set to such amounts, in which a sufficient discharge speed of the overflow is ensured without undue impact losses or material losses occur: The excess of overflow is returned to the separation process. Also, a safety margin for the overflow amount to compensate for throughput volume fluctuations is easy to implement. However, it is also easily possible to control the amount of the recirculation component in such a way that the overflow quantity remains constant even with changed throughput ratios or is kept above a set minimum value.
  • the return flow from the flow stream can be divided.
  • Fig. 1 shows schematically a pressure sorter 1.
  • the incoming pulp suspension stream 2 is guided into the interior of the housing 11 and then passes radially from inside to outside partly the cylindrical screen basket 7.
  • This can be provided with slot-shaped screen openings whose width, for example between 0 , 08 and 0.5 mm.
  • a flow stream 3 is formed and an overflow stream 4. Both streams can then leave the housing 11 through the connection piece.
  • a rotating scraper 13 located radially inside the screen basket 7, a rotating scraper 13.
  • Such pressure graders are known in many variations and need not be described in detail machine technology.
  • the overflow stream 4 is divided in a distribution device 8.
  • the overflow stream 4 exits the housing with an overpressure, which makes it possible to return the diverted from the overflow stream 4 return flow 5 without further pump in the housing again.
  • This is in the center of the lid, so where a relatively low pressure prevails, a Rezirkulationsaufsatzteil 14, whose function on hand Fig. 2 is explained.
  • the recirculation attachment part 14 is placed concentrically with the housing 11 on the lid 10 arranged above, preferably screwed to it via flanges.
  • the pipe section 16 is open to the inlet space 17 of the pressure sorter 1.
  • the pipe section 16 terminate internally with the cover 10, while the return line 18 opens at a distance A from the lid 10, which corresponds for example to 1 to 5 times the inner diameter of the return line 18.
  • the vent line 15 'can have a connection angle ⁇ to the horizontal, which is greater than 0, for example between 5 and 30 °, which can be easily deduct the gases accumulating above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

In a method for removing impurities from a fiber suspension involving passing a suspension stream (2) into a pressure sorter (1), in which an overflow stream (4) is abstracted and a back-flow stream (5) is is fed back to the center of the sorter inflow chamber through a line in the middle of the sorter lid (10), gases (12) from the center of the sorter housing (11) are passed through a piece of tubing concentrically surrounding the back-flow line. A method for removing impurities from a fiber suspension involves passing a stream (2) of the suspension into the inflow chamber (17) of a pressure sorter (1), in which the components to be separated are enriched before a wire basket (7) and an overflow stream (4) is abstracted. The remainder of the suspension forms the through-flow stream (3) of the sorter. A back-flow stream (5) is formed, and is fed back to the center of the inflow chamber through a back-flow line in the middle of the lid (10) of the sorter. The novel feature is that gases (12) from the central region of the sorter housing (11) are passed through a piece of tubing concentrically surrounding the back-flow line.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.

Ein derartiges Verfahren ist beispielsweise aus EP-A-1 184 509 bekannt.Such a method is for example off EP-A-1 184 509 known.

Ein solches Trennverfahren dient zur Entfernung von unerwünschten Begleitstoffen, sogenannten Störstoffen, insbesondere aus einer zur Papiererzeugung geeigneten Fasersuspension. Bekanntlich enthalten Faserstoffsuspensionen, die zur Papiererzeugung eingesetzt werden sollen, insbesondere solche, die aus Altpapier gewonnen worden sind, oft eine mehr oder weniger große Menge von Störstoffen, die in der Aufbereitungsanlage entfernt werden müssen. Als hierzu besonders zweckmäßig haben sich Siebapparate erwiesen, die Sortierer oder Drucksortierer genannt werden.Such a separation process serves to remove undesired accompanying substances, so-called impurities, in particular from a fiber suspension suitable for paper production. As is known, pulp suspensions to be used for papermaking, especially those recovered from waste paper, often contain a greater or lesser amount of impurities which must be removed in the processing plant. Screening apparatuses which are called sorters or pressure sorters have proved particularly suitable for this purpose.

Bei einem Drucksortierer wird die Suspension an einem Sieb in mindestens zwei Fraktionen aufgeteilt, und zwar einen Durchlauf, der die Stoffe, die das Sieb passiert haben, enthält und einen Überlauf mit den Stoffen, die auf Grund ihrer Größe abgewiesen wurden. Bei Verfahren dieser Art gelangen die Fasern als gereinigte Gutstoffsuspension in den Durchlauf. Dabei geht auch das reichlich enthaltene Wasser vorzugsweise in den Durchlauf, so dass der Überlauf eingedickt wird.In a pressure sorter, the suspension on a sieve is divided into at least two fractions, one that contains the substances that have passed through the sieve and one that overflows with the substances that have been rejected because of their size. In processes of this type, the fibers get into the pass as purified accepts suspension. It is also the abundant water is preferably in the flow, so that the overflow is thickened.

Bei sehr kleiner Menge des Überlaufes kann diese Eindickung zu Schwierigkeiten beim Abtransport aus dem Siebbereich führen. Neben dem Nachteil der eingeschränkten Betriebssicherheit des Drucksortierers wird ein Teil des Siebes so belegt, dass dort kaum noch Durchlauf gebildet wird. Oft ist aber gerade der Abzug von relativ kleinen Überlaufmengen erwünscht, z.B. dann, wenn bei Störstoffsortierung keine weitere Sortierstufe für den Überlauf vorgesehen ist. Außerdem geht bei modernen hochwirksamen Drucksortierern die Entwicklung hin zu größeren Sieben mit feinen Öffnungen und kleineren Überlaufraten, was das Problem der Überlaufeindickung weiter vergrößert. Kommen dann noch größere Mengenschwankungen im Durchsatz durch den Drucksortierer hinzu, lässt sich mancher Sortierer nicht mehr befriedigend betreiben.With very small amount of overflow, this thickening can lead to difficulties in removal from the screen area. In addition to the disadvantage of the limited reliability of the pressure sorter, a part of the screen is so occupied that there hardly any passage is formed. Often, however, the withdrawal of relatively small overflow quantities is often desirable, for example, if there is no further sorting stage for the overflow during the sorting of contaminants. In addition, modern high efficiency pressure sorters are moving towards larger screens with fine openings and smaller overflow rates, further increasing the problem of overflow thickening. Then come even larger volume fluctuations in throughput through the Add pressure sorter, some sorters can no longer operate satisfactorily.

Aus der DE 101 25 975 ist ein Verfahren bekannt, bei dem ein Teil des Überlaufes in den Zulauf des Drucksortierers zurückgeführt wird.From the DE 101 25 975 a method is known in which a part of the overflow is fed back into the inlet of the pressure sorter.

Der Erfindung liegt die Aufgabe zu Grunde, ein betriebssicheres Verfahren zu schaffen, mit dem Rücklaufströme einfach und problemlos in den Drucksortierer zurückgeführt werden können.The invention is based on the object to provide a reliable method, can be returned to the return streams easily and easily in the pressure sorter.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 in vollem Umfang gelöst.This object is solved by the features of claim 1 in its entirety.

Typischerweise wird der Rücklaufstrom als Rezirkulationsanteil vom Überlaufstrom abgezweigt. Ein solcher Rücklaufstrom verbessert den sicheren Betrieb des Drucksortierers. Günstig ist, dass der Überlauf auf solche Mengen eingestellt werden kann, bei denen eine ausreichende Abflussgeschwindigkeit des Überlaufes gewährleistet ist, ohne dass unzulässige Wirkungseinbußen oder Stoffverluste auftreten: Das Mehr an Überlauf wird wieder in den Trennprozess zurückgeführt. Auch ein Sicherheitszuschlag für die Überlaufmenge zum Ausgleich von Durchsatz-Mengenschwankungen ist problemlos zu realisieren. Es ist aber auch leicht möglich, die Menge des Rezirkulationsanteils so zu steuern, dass die Überlaufmenge auch bei geänderten Durchsatzverhältnissen konstant bleibt oder oberhalb eines eingestellten Mindestwertes gehalten wird.Typically, the return flow is diverted as recirculation from the overflow stream. Such return flow improves the safe operation of the pressure sorter. It is favorable that the overflow can be set to such amounts, in which a sufficient discharge speed of the overflow is ensured without undue impact losses or material losses occur: The excess of overflow is returned to the separation process. Also, a safety margin for the overflow amount to compensate for throughput volume fluctuations is easy to implement. However, it is also easily possible to control the amount of the recirculation component in such a way that the overflow quantity remains constant even with changed throughput ratios or is kept above a set minimum value.

In besonderen Fällen kann auch der Rücklaufstrom vom Durchlaufstrom abgeteilt werden.In special cases, the return flow from the flow stream can be divided.

Durch die im Anspruch beschriebene Art der Zugabe des Rücklaufstromes besteht die Möglichkeit, mit einfachen Mitteln sowohl den Inhalt des Sortierers zu entlüften, als auch den Rücklaufstrom optimal einzuleiten. Diese Anordnung führt dazu, dass der Rücklaufstrom besonders günstig ohne separate Pumpe wieder zugegeben werden kann, da im Zentrum des Sortierers ein sehr geringer Druck herrscht. Gase und Leichtstoffe sammeln sich bei senkrecht stehendem Sortierer unmittelbar unter dem Deckel und können in ein am Deckel angeschlossenes Rezirkulationsaufsatzteil abfließen.By described in the claim type of addition of the return flow, it is possible to vent with simple means both the contents of the sorter, as well as optimally initiate the return flow. This arrangement means that the return flow can be added again particularly favorably without a separate pump, since there is a very low pressure in the center of the sorter. Gases and light materials accumulate in a vertical sorter directly under the lid and can drain into a connected to the lid recirculation attachment part.

Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen

Figur 1:
Ein exemplarisches Verfahrensschema zur erfindungsgemäßen Störstoffentfernung;
Figur 2:
Detail eines erfindungsgemäßen Drucksortierers mit montiertem Rezirkulationsaufsatzteil;
Figur 3:
Rezirkulationsaufsatzteil zur Durchführung des Verfahrens in Ansicht von oben;
Figur 4:
Eine Variante des in Fig. 2 gezeigten Teils in Seitenansicht;
Figur 5:
Eine alternative Nutzung des Anschlusses.
The invention and its advantages will be explained with reference to drawings. Show
FIG. 1:
An exemplary process scheme for the removal of contaminants according to the invention;
FIG. 2:
Detail of a pressure sorter according to the invention with mounted recirculation attachment part;
FIG. 3:
Recirculation attachment for carrying out the process in top view;
FIG. 4:
A variant of in Fig. 2 shown part in side view;
FIG. 5:
An alternative use of the connection.

Fig. 1 zeigt schematisch einen Drucksortierer 1. Beim Betrieb einer solchen Maschine wird der zuströmende Faserstoffsuspensionsstrom 2 in das Innere des Gehäuses 11 geführt und passiert dann radial von innen nach außen teilweise den zylindrischen Siebkorb 7.Dieser kann mit schlitzförmigen Sieböffnungen versehen sein, deren Weite z.B. zwischen 0,08 und 0,5 mm liegt. Am Siebkorb 7 wird ein Durchlaufstrom 3 gebildet sowie ein Überlaufstrom 4. Beide Ströme können dann durch Anschlussstutzen das Gehäuse 11 wieder verlassen. Um ein Verstopfen des Siebes zu verhindern, befindet sich radial innerhalb des Siebkorbes 7 ein rotierender Räumer 13. Solche Drucksortierer sind in sehr vielen Variationen bekannt und brauchen maschinentechnisch nicht näher beschrieben zu werden. Beim hier gezeigten Beispiel wird der Überlaufstrom 4 in einer Verteileinrichtung 8 aufgeteilt. Wegen der Rotationsbewegung, die innerhalb des Siebkorbes 7 durch den Räumer 13 erzeugt wird, tritt der Überlaufstrom 4 aus dem Gehäuse aus mit einem Überdruck, der es ermöglicht, den aus dem Überlaufstrom 4 abgezweigten Rücklaufstrom 5 ohne weitere Pumpe in das Gehäuse wieder zurückzuführen. Dazu befindet sich im Zentrum des Deckels, also wo ein relativ geringer Druck herrscht, ein Rezirkulationsaufsatzteil 14, dessen Funktion an Hand der Fig. 2 erläutert wird. Fig. 1 shows schematically a pressure sorter 1. In operation of such a machine, the incoming pulp suspension stream 2 is guided into the interior of the housing 11 and then passes radially from inside to outside partly the cylindrical screen basket 7.This can be provided with slot-shaped screen openings whose width, for example between 0 , 08 and 0.5 mm. At the strainer 7, a flow stream 3 is formed and an overflow stream 4. Both streams can then leave the housing 11 through the connection piece. In order to prevent clogging of the screen, located radially inside the screen basket 7, a rotating scraper 13. Such pressure graders are known in many variations and need not be described in detail machine technology. In the example shown here, the overflow stream 4 is divided in a distribution device 8. Because of the rotational movement that is generated within the screen basket 7 by the reamer 13, the overflow stream 4 exits the housing with an overpressure, which makes it possible to return the diverted from the overflow stream 4 return flow 5 without further pump in the housing again. This is in the center of the lid, so where a relatively low pressure prevails, a Rezirkulationsaufsatzteil 14, whose function on hand Fig. 2 is explained.

Das Rezirkulationsaufsatzteil 14 ist konzentrisch mit dem Gehäuse 11 auf den oben angeordneten Deckel 10 aufgesetzt, vorzugsweise mit diesem über Flansche verschraubt.The recirculation attachment part 14 is placed concentrically with the housing 11 on the lid 10 arranged above, preferably screwed to it via flanges.

Im Zentrum des Rezirkulationsaufsatzteils 14 mündet die Rücklaufleitung 18. Sie ist umgeben von einem konzentrisch angeordneten Rohrstück 16, an das die Entlüftungsleitung 15 angeschlossen ist, und zwar vorzugsweise tangential (s. Fig. 3). Durch diese können die Gase, eventuell auch Leichtstoffe aus dem Zulaufraum 17 des Drucksortierers 1 abfließen. Das Rohrstück 16 ist zum Zulaufraum 17 des Drucksortierers 1 geöffnet. Vorteilhafterweise kann das Rohrstück 16 innen mit dem Deckel 10 abschließen, während die Rücklaufleitung 18 in einem Abstand A vom Deckel 10 mündet, der z.B. dem 1- bis 5-Fachen des Innendurchmessers der Rücklaufleitung 18 entspricht.It is surrounded by a concentrically arranged pipe section 16, to which the vent line 15 is connected, preferably tangentially (s. Fig. 3 ). Through this, the gases, possibly also light materials from the inlet space 17 of the pressure sorter 1 flow. The pipe section 16 is open to the inlet space 17 of the pressure sorter 1. Advantageously, the pipe section 16 terminate internally with the cover 10, while the return line 18 opens at a distance A from the lid 10, which corresponds for example to 1 to 5 times the inner diameter of the return line 18.

Wie Fig. 4 zeigt, kann die Entlüftungsleitung 15' einen Anschlusswinkel α gegenüber der Waagerechten haben, der größer ist als 0, z.B. zwischen 5 und 30° liegt, wodurch sich die oben ansammelnden Gase leichter abziehen lassen.As Fig. 4 shows, the vent line 15 'can have a connection angle α to the horizontal, which is greater than 0, for example between 5 and 30 °, which can be easily deduct the gases accumulating above.

Das Verfahren wurde in den Figuren am Beispiel eines gewölbten Deckels 10 erläutert. Es ist aber weitgehend von der Deckelform unabhängig, kann also auch bei Sortierern mit konischem oder flachem Deckel verwendet werden. Eine gewölbte oder konische Form ist im Allgemeinen vorzuziehen.The method was explained in the figures using the example of a curved lid 10. However, it is largely independent of the lid shape, so it can also be used in sorters with conical or flat lid. A domed or conical shape is generally preferable.

Claims (15)

  1. Method for separating impurities from a fibrous suspension, a fibrous suspension stream (2) being led into a feed chamber (17) of a pressure screen (1), a fraction of the fibrous suspension that is to be separated off in the pressure screen (1) being enriched in front of a screen basket (7) and led out in an overflow stream (4), while the other fraction of the fibrous suspension leaves the pressure screen (1) as a through-feed stream (3), a return flow stream (5) being formed, which is led back into the centre of the feed chamber (17) of the pressure screen through a central return flow line (18) fitted in the centre of the cover (10) of the pressure screen,
    characterized in that
    gases (12) are led out of a central region of the housing (11) of the pressure screen (1) through a concentric piece of pipe (16) surrounding the return flow line (18).
  2. Method according to Claim 1,
    characterized in that
    part of the overflow stream (4) is taken as the return flow stream (5).
  3. Method according to Claim 2,
    characterized in that
    the other part of the overflow stream (4) is used to form a rejects stream (6), with which undesired contaminants are led away.
  4. Method according to Claim 2 or 3, the pressure screen (1) being operated in such a way that the overflow stream (4) is thickened and the through-feed stream (3) becomes thinner,
    characterized in that
    the return flow stream (5) is set to be at least so large that the thickening of the overflow stream (4) remains so low under all operating conditions that its flow out of the pressure screen (1) is not impeded.
  5. Method according to one of the preceding claims,
    characterized in that
    a stream of gas (12), in particular of air, is led out of the central region of the feed chamber (17) .
  6. Method according to one of the preceding claims,
    characterized in that
    a cylindrical screen basket (7) with slot-like screen openings is used.
  7. Method according to one of Claims 2, 3, 4, 5 or 6,
    characterized in that
    the dividing of the overflow stream (4) is set by a controller which activates an appropriate distribution device (8).
  8. Method according to one of the preceding claims,
    characterized in that
    the return flow stream (5) is guided in a pipeline arranged outside the housing (11) of the pressure screen (1).
  9. Method according to one of the preceding claims, characterized in that
    use is made of a recirculation attachment (14), which is fitted in the centre of the cover (10) of the pressure screen (1) and comprises the central return flow line (18) and the concentric piece of pipe (16) surrounding the latter, to which piece of pipe a vent line (15, 15') is connected, and in that both the return flow line (18) and the piece of pipe (16) open into the feed chamber (17) of the pressure screen (1).
  10. Method according to Claim 9,
    characterized in that
    the gases (12) are led tangentially away out of the piece of pipe (16).
  11. Method according to Claim 9 or 10,
    characterized in that
    the vent line (15') is aligned with respect to the horizontal at a connection angle (α) which lies between 5 and 30°.
  12. Method according to one of Claims 9, 10 or 11,
    characterized in that
    the return flow line (18) opens into the feed chamber (17) at an axial distance (A) from the piece of pipe (16) which is 1 to 10 times, preferably 2 to 5 times, the internal diameter of the return flow line (18).
  13. Method according to one of Claims 9 to 12,
    characterized in that
    the internal diameter of the piece of pipe (16) has a dimension between 5% and 40%, preferably 10 and 20%, of the internal diameter of the housing (11) in the region of the feed chamber (17).
  14. Method according to one of Claims 9 to 13,
    characterized in that
    the internal diameter of the piece of pipe (16) has a dimension of 150% to 400% of the internal diameter of the return flow line (18).
  15. Method according to one of Claims 9 to 14,
    characterized in that
    an axial length of the piece of pipe (16) lies between 100 and 1000 mm.
EP07008488A 2006-07-04 2007-04-26 Method for separating impurities from a fibrous suspension Not-in-force EP1876289B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006030905A DE102006030905B3 (en) 2006-07-04 2006-07-04 Removing impurities from fiber suspension, especially for use in paper-making, by use of pressure sorter in which back-flow stream is recirculated to sorter via line surrounded by gas-containing tube

Publications (2)

Publication Number Publication Date
EP1876289A1 EP1876289A1 (en) 2008-01-09
EP1876289B1 true EP1876289B1 (en) 2011-08-10

Family

ID=38190277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07008488A Not-in-force EP1876289B1 (en) 2006-07-04 2007-04-26 Method for separating impurities from a fibrous suspension

Country Status (4)

Country Link
US (1) US20080006580A1 (en)
EP (1) EP1876289B1 (en)
AT (1) ATE519889T1 (en)
DE (1) DE102006030905B3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008061970A1 (en) 2008-12-12 2010-06-17 Voith Patent Gmbh Approach flow sorting
DE102012215577A1 (en) 2012-09-03 2014-03-06 Voith Patent Gmbh pressure screens
CN112892219B (en) * 2021-01-22 2022-11-29 宜昌天仁药业有限责任公司 Microfiltration membrane experimental equipment for membrane separation

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2249013A (en) * 1939-09-01 1941-07-15 Paul B Levengood Cleaning apparatus
US3209914A (en) * 1961-08-15 1965-10-05 Carl H Nordell Screen and rake combination for removing solids from liquids
US3255884A (en) * 1962-10-09 1966-06-14 Jr George W Sargent Paper stock screen
US3363771A (en) * 1966-08-03 1968-01-16 Brown Charles H Liquid filter
US4027691A (en) * 1972-01-08 1977-06-07 N.V. Spiro Research Device for venting and aerating closed circulatory water flow systems
DE3519373A1 (en) * 1985-05-30 1986-12-04 J.M. Voith Gmbh, 7920 Heidenheim SORTING DEVICE
FI87999C (en) * 1990-08-14 1993-03-25 Ahlstroem Oy Separation method and apparatus for separating valuable or useless fraction from pulp, solvent or equivalent material suspension by utilizing the flotation process
FI94440C (en) * 1990-08-14 1995-09-11 Ahlstroem Oy Process and plant for treating air and / or gas-containing liquid or fiber suspension and use of a gas separating pulp pump
FI93979C (en) * 1993-08-20 1995-06-26 Tampella Oy Valmet Method and pressure sorter for sorting pulp
DE19702044C1 (en) * 1997-01-22 1998-04-16 Voith Sulzer Stoffaufbereitung Sieve assembly for papermaking fibre suspension
FI103290B1 (en) * 1997-11-13 1999-05-31 Valmet Raisio Oy A method and arrangement for separating impurities from a machine cycle of a coating station
US6571957B1 (en) * 2000-08-07 2003-06-03 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension
DE10060822B4 (en) * 2000-12-07 2006-04-27 Voith Paper Patent Gmbh Pressure sorter for removing contaminants from a paper pulp suspension containing contaminants
DE10125975A1 (en) * 2001-05-29 2002-12-05 Voith Paper Patent Gmbh Process for separating fractions from a fiber suspension
DE10233364C1 (en) * 2002-07-23 2003-12-24 Voith Paper Patent Gmbh Pressure sorter for sieving a fiber suspension

Also Published As

Publication number Publication date
DE102006030905B3 (en) 2007-07-19
EP1876289A1 (en) 2008-01-09
ATE519889T1 (en) 2011-08-15
US20080006580A1 (en) 2008-01-10

Similar Documents

Publication Publication Date Title
DE68928632T2 (en) Process and apparatus for treating pulp
DE102004051327B4 (en) Method for degassing and feeding a pulp suspension to a headbox and degassing
EP1876289B1 (en) Method for separating impurities from a fibrous suspension
EP1799903B1 (en) Method for fractionating an aqueous paper fibre suspension and hydrocyclone for carrying out said method
EP1860231A2 (en) Method and device for cleaning paper raw materials containing impurities
EP1826314A1 (en) Process for pulping and cleaning of papermaking raw materials containing impurities
EP1245724B1 (en) Pressure screen for cleaning paper pulp containing impurities and its use
DE10038282C2 (en) Hydrocyclone and its use
DE69611732T2 (en) SCREEN DEVICE
DE69417763T2 (en) PLANT IN A PRESSURE SCREEN FOR SEPARATING THE IMPURITIES FROM A FIBER SUSPENSION INSERTED IN THE SCREEN
DE102007033919A1 (en) Cyclone oil filter e.g. for machine or engine, has separation tube, filter tube, through separation tube and pushed at upper end is sealed, so that space between pipes is created
EP1749923B1 (en) Apparatus for treating a fibrous suspension
CH644029A5 (en) METHOD AND DEVICE FOR COLLECTING AND REMOVING FLOATING SUBSTANCES AND COMPACT IMPURITIES FROM A SUSPENSION.
AT413391B (en) SORTER FOR CLEANING A FIBER SUSPENSION
EP1884591A1 (en) Method for feeding a fibrous material suspension into a headbox
EP1710347A1 (en) Process for pulping and cleaning of papermaking raw materials containing impurities
DE69914068T2 (en) PRESSURE SORTER WITH WASTE SEPARATION
EP1262594B1 (en) Process for separating specified materials from an aqueous fibrous material suspension
EP1479425A1 (en) Plant for cleaning and degassing fibrous suspension
EP1462567B1 (en) Screen for purification of fibrous pulp
DE102006003648A1 (en) Apparatus for ventilation, cleaning or sorting of fiber suspension, has close casing with inlet, outlet, centrally arranged rotor and hydraulic lead element which moves fiber suspension in rotation
DE19738912A1 (en) Separator removing solids from gaseous flow
DE102004051887B3 (en) Pressure material sorting system for sieving suspension of fibers in liquid has vessel with tangential entry and narrow gap leading to chamber inside cylindrical sieve containing rotor with paddles
EP3398671A1 (en) Device for the separation of solid particles from suspensions
DE102024113569A1 (en) Underflow discharge device and hydrocyclone with such an underflow discharge device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20080709

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502007007885

Country of ref document: DE

Effective date: 20111013

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20110810

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20110810

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111210

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111212

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111111

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

26N No opposition filed

Effective date: 20120511

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502007007885

Country of ref document: DE

Effective date: 20120511

BERE Be: lapsed

Owner name: VOITH PATENT G.M.B.H.

Effective date: 20120430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20120426

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20121228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120426

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120426

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502007007885

Country of ref document: DE

Effective date: 20121101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120427

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111121

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 519889

Country of ref document: AT

Kind code of ref document: T

Effective date: 20120426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120426

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110810

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121101