EP1449957A1 - Process for determining the properties of a fibrous suspension - Google Patents
Process for determining the properties of a fibrous suspension Download PDFInfo
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- EP1449957A1 EP1449957A1 EP03025880A EP03025880A EP1449957A1 EP 1449957 A1 EP1449957 A1 EP 1449957A1 EP 03025880 A EP03025880 A EP 03025880A EP 03025880 A EP03025880 A EP 03025880A EP 1449957 A1 EP1449957 A1 EP 1449957A1
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- Prior art keywords
- pressure
- sorter
- measured
- rotor
- pulses
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/023—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.
- Fibrous suspensions formed because a large part of the required The best way to carry out work steps with such suspensions. Fibrous suspensions of this type have a complex rheological behavior. Your Toughness depends not only on the composition of the fibers, the proportion of Additives, the solids content in the suspension and the treatment status of the Fibers, but also from the applied shear force gradient. When regulating and It is the control system for the processing of pulp or waste paper usually very important, the consistency of the fiber suspension, i.e. the Knowing the solids content at certain points in the system as precisely as possible. For this there are inline-working consistency measuring devices, but they are complex and also do not always give good results.
- An important step in pulp and paper fiber processing is in executed a pressure sorter and serves to use a fiber suspension dividing a sieve into at least two fractions.
- the in the fiber suspension Fibers contained are said to flow through the openings of the sieve pass through while the unwanted solid components are rejected and as Overflow current from the sorter to be led out separately. In other cases it should be aimed to divide the fiber suspension into fractions, the fibers in the Seen in different lengths mean.
- the sorting openings are e.g. slots or round holes are used. It is known for the effect of a sorter not only the selection of the sieve is important, but also operating parameters such as the quantitative division into flow and overflow. When laying down This division takes into account the requirements placed on the sorting process, the rheological behavior of the pulp suspension in the pressure sorter Sets limits.
- Pressure sorters can have both flat and cylindrical sieve inserts. To prevent the sieve openings from becoming blocked, they are equipped with rotors, e.g. are provided with wings that are moved along the surface of the screen can, so that vortices arise there for the stated purpose. Then you also speak from siebdisproportionater.
- the invention is based on the object of a method for determining the to find rheological properties of the fiber suspension that can be used there, where a pressure screen with a rotor is used. It's supposed to be special be simple and in special embodiments for regulating or controlling the Pressure sorter.
- the process takes advantage of the fact that the rotor in the pulp suspension generated pressure surges depending on the rheology of the suspension until the Pressure transducer can be damped to different degrees.
- the pressure pulses are evaluated, for example, so that the pressure surges generated by the rotor are filtered out and their amplitudes are used to form a measured value.
- Pressure signals are subjected to a fast Fourier transformation and the Peak values added. This is then verified by appropriate calibration e.g. with the The consistency of the suspension has been linked.
- Most known Consistency measuring devices also work on the principle of measurement rheological quantities to correlate a consistency measurement.
- the inventive method offers a particular advantage when the rheological properties of the fiber suspension significantly on the operation of the Impact sorter.
- the operating behavior depends on a Pressure sorter also depends on how far a thickening of the pressure sorter passed suspension takes place. So there are operating conditions where a relatively small overflow quantity set for sorting technology reasons should be, but operational safety no longer for rheological reasons is guaranteed.
- a Operating mode can be found that requires a good compromise between Operational safety (larger overflow) and optimal reject composition (smaller overflow) of the pressure sorter.
- Another rule option is to increase the rotor speed if the thickening of the rotor is too strong Suspension is reported. You can do this at a selected point in the Pressure sorter measured pressure pulse value are sufficient. The use is more precise two pressure pulse signals at different points, which are chosen so that the Thickening of the fiber suspension determined their way through the pressure sorter becomes.
- a pressure sorter is shown in section, without this figure as Engineering drawing would be understood.
- the actual sieve 3 is designed as a cylindrical sieve basket and divides from the inlet space 1 an accept material space 4, which with the accept material outlet 5 for the flow A in Connection is established.
- the inlet space 1 goes into the reject space 6 at its lower end via, to which a reject line 7 is connected, through which the overflow current R flows.
- the screen 3 is kept free of blockages by a rotor 8, whereby here as an example a hub part 9 with attached clearing blades 10 (in the form hydraulic foils) is drawn.
- the housing wall 11 of the pressure sorter that closes the accepting substance space 4 is two here Pressure transducers 12, 13 shown, the hydraulically with the 4 Gutstoffraum Connect. This allows those in the suspension to appear there Pressure pulses are measured and sent to a measured value evaluation device 14 to get redirected.
- the pressure transducers 12, 13 are advantageously there positioned where clear measurement signals occur. This is particularly the case in the hazardous materials room 4 the case where the pulsations generated by the clearing vanes 10 have an effect and the is generally easily accessible.
- the reject line 7 is here with a controllable valve 15 provided with the during operation of the pressure sorter the amount of reject can be adjusted. This control process is only an example to watch.
- the pressures P measured by a pressure transducer, plotted over time T, are shown qualitatively in Fig. 2.
- a curve 16 is shown on the left, which is shown in Dependence on rotor speed and number of blades at certain intervals Contains peak values 17.
- the size of these peak values is - as already explained - as a measured value for assessing the rheological properties of the suspension to watch.
- the peak values become larger or smaller displayed. While the left part of the diagram shows a first operating state 18 represents, the second part shows a changed operating state 19, in which the Peak values 17 'of curve 16' become smaller as a result of increasing suspension thickening became.
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- Mechanical Engineering (AREA)
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Abstract
Description
Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of
Bekanntlich werden bei der Zellstoff- und Papierfaseraufbereitung Faserstoffsuspensionen gebildet, da sich ein großer Teil der dabei erforderlichen Arbeitsschritte am günstigsten mit solchen Suspensionen durchführen lässt. Faserstoffsuspensionen dieser Art haben ein komplexes rheologisches Verhalten. Ihre Zähigkeit hängt nicht nur von der Zusammensetzung der Fasern, dem Anteil der Zusatzstoffe, dem Feststoffgehalt in der Suspension und dem Behandlungszustand der Fasern ab, sondern auch vom anliegenden Scherkraftsgefälle. Bei der Regelung und Steuerung von Anlagen, die der Aufbereitung von Zellstoff oder Altpapier dienen, ist es in der Regel sehr wichtig, die Konsistenz der Faserstoffsuspension, d.h. den Feststoffgehalt an bestimmten Stellen in der Anlage möglichst genau zu kennen. Hierzu gibt es inline-arbeitende Konsistenz-Messgeräte, die aber aufwändig sind und auch nicht immer gute Ergebnisse liefern.It is well known in pulp and paper fiber processing Fibrous suspensions formed because a large part of the required The best way to carry out work steps with such suspensions. Fibrous suspensions of this type have a complex rheological behavior. Your Toughness depends not only on the composition of the fibers, the proportion of Additives, the solids content in the suspension and the treatment status of the Fibers, but also from the applied shear force gradient. When regulating and It is the control system for the processing of pulp or waste paper usually very important, the consistency of the fiber suspension, i.e. the Knowing the solids content at certain points in the system as precisely as possible. For this there are inline-working consistency measuring devices, but they are complex and also do not always give good results.
Ein wichtiger Arbeitsschritt in der Zellstoff- und Papierfaseraufbereitung wird in einem Drucksortierer ausgeführt und dient dazu, eine Faserstoffsuspension mit Hilfe eines Siebes in mindestens zwei Fraktionen aufzuteilen. Die in der Faserstoffsuspension enthaltenen Fasern sollen dabei als Durchlaufstrom durch die Öffnungen des Siebes hindurchtreten, während die nicht gewünschten festen Bestandteile abgewiesen und als Überlaufstrom aus dem Sortierer separat herausgeleitet werden. In anderen Fällen kann es angestrebt sein, die Faserstoffsuspension in Fraktionen aufzuteilen, deren Fasern im Mittel gesehen verschiedene Längen haben. Als Sortieröffnungen werden z.B. Schlitze oder runde Löcher verwendet. Es ist bekannt, dass für die Wirkung eines Sortierers nicht nur die Auswahl des Siebes wichtig ist, sondern auch Betriebsparameter, wie z.B. die mengenmäßige Aufteilung in Durchlaufstrom und Überlaufstrom. Bei der Festlegung dieser Aufteilung wird die an den Sortierprozess gestellte Anforderung berücksichtigt, wobei das rheologische Verhalten der Faserstoffsuspension in dem Drucksortierer Grenzen setzt.An important step in pulp and paper fiber processing is in executed a pressure sorter and serves to use a fiber suspension dividing a sieve into at least two fractions. The in the fiber suspension Fibers contained are said to flow through the openings of the sieve pass through while the unwanted solid components are rejected and as Overflow current from the sorter to be led out separately. In other cases it should be aimed to divide the fiber suspension into fractions, the fibers in the Seen in different lengths mean. The sorting openings are e.g. slots or round holes are used. It is known for the effect of a sorter not only the selection of the sieve is important, but also operating parameters such as the quantitative division into flow and overflow. When laying down This division takes into account the requirements placed on the sorting process, the rheological behavior of the pulp suspension in the pressure sorter Sets limits.
Drucksortierer können sowohl ebene, als auch zylindrisch geformte Siebeinsätze haben. Um das Verstopfen der Sieböffnungen zu verhindern, sind sie mit Rotoren ausgestattet, die z.B. mit Flügeln versehen sind, die entlang der Sieboberfläche bewegt werden können, so dass dort zu dem genannten Zweck Wirbel entstehen. Man spricht dann auch von Siebräumern.Pressure sorters can have both flat and cylindrical sieve inserts. To prevent the sieve openings from becoming blocked, they are equipped with rotors, e.g. are provided with wings that are moved along the surface of the screen can, so that vortices arise there for the stated purpose. Then you also speak from siebräumer.
Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zur Bestimmung der rheologischen Eigenschaften der Faserstoffsuspension zu finden, das dort einsetzen kann, wo ein mit einem Rotor versehener Drucksortierer verwendet wird. Es soll besonders einfach sein und in speziellen Ausführungsformen zur Regelung oder Steuerung des Drucksortierers dienen.The invention is based on the object of a method for determining the to find rheological properties of the fiber suspension that can be used there, where a pressure screen with a rotor is used. It's supposed to be special be simple and in special embodiments for regulating or controlling the Pressure sorter.
Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 genannten Merkmale
gelöst.This object is achieved by the features mentioned in the characterizing part of
Das Verfahren nutzt die Tatsache, dass die vom Rotor in der Faserstoffsuspension erzeugten Druckstöße je nach Rheologie der Suspension bis zum Erreichen des Druckaufnehmers unterschiedlich stark gedämpft werden. Die Druckimpulse werden beispielsweise so ausgewertet, dass die vom Rotor erzeugten Druckstöße herausgefiltert und ihre Amplituden zur Bildung eines Messwertes benutzt werden. Oder die Drucksignale werden einer schnellen Fourier Transformation unterzogen und die Peakwerte addiert. Dieser wird dann durch entsprechende Eichung z.B. mit der Konsistenz der Suspension in Verbindung gebracht. Die meisten bekannten Konsistenzmessgeräte arbeiten ebenfalls nach dem Prinzip, aus der Messung rheologischer Größen einen Konsistenzmesswert zu korrelieren.The process takes advantage of the fact that the rotor in the pulp suspension generated pressure surges depending on the rheology of the suspension until the Pressure transducer can be damped to different degrees. The pressure pulses are evaluated, for example, so that the pressure surges generated by the rotor are filtered out and their amplitudes are used to form a measured value. Or that Pressure signals are subjected to a fast Fourier transformation and the Peak values added. This is then verified by appropriate calibration e.g. with the The consistency of the suspension has been linked. Most known Consistency measuring devices also work on the principle of measurement rheological quantities to correlate a consistency measurement.
Es ist im Allgemeinen nicht schwierig, die in einer Faserstoffsuspension vorliegenden Druckimpulse an der Außenwand eines Drucksortierers zu messen. Derartige Druckaufnehmer und die entsprechende Auswertung sind wesentlich einfacher und billiger als Konsistenzmessgeräte. Sie haben auch keinen störenden Einfluss auf den Betrieb des Drucksortierers. In den Fällen, in denen also eine Konsistenzmessung vorgenommen werden soll, z.B. um den Betrieb der Anlage zu steuern, kann auf relativ einfache Weise ein solcher Wert ermittelt werden, wobei lediglich eine Eichung erforderlich ist. Bei dieser Eichung könnte in den seltenen Fällen, bei denen die Drehzahl des Rotors im Drucksortierer nicht konstant gehalten wird, eine Korrektur bei geänderter Drehzahl erfolgen. Auch das lässt sich durch entsprechende Eichkurven oder einfache Versuche leicht durchführen.It is generally not difficult to find those in a pulp suspension Measure pressure pulses on the outside wall of a pressure sorter. such Pressure sensors and the corresponding evaluation are much easier and cheaper than consistency measuring devices. They also have no disruptive influence on the Operation of the pressure sorter. In cases where there is a consistency measurement to be carried out, e.g. to control the operation of the plant can be relative Such a value can be determined in a simple manner, with only one calibration is required. In the rare cases where the Speed of the rotor in the pressure sorter is not kept constant, a correction at a changed speed. This can also be done using appropriate calibration curves or easily carry out simple experiments.
Einen besonderen Vorteil bietet das erfindungsgemäße Verfahren dann, wenn sich die rheologischen Eigenschaften der Faserstoffsuspension signifikant auf den Betrieb des Drucksortierers auswirken. Bekanntlich hängt das Betriebsverhalten eines Drucksortierers auch davon ab, wie weit eine Eindickung der durch den Drucksortierer hindurchgeführten Suspension stattfindet. So gibt es Betriebszustände, bei denen zwar aus sortiertechnologischen Gründen eine relativ geringe Überlaufmenge eingestellt werden sollte, aber die Betriebssicherheit aus rheologischen Gründen nicht mehr gewährleistet ist. Mit Hilfe des erfindungsgemäßen Verfahrens kann dann eine Betriebsweise gefunden werden, die einen guten Kompromiss zwischen erforderlicher Betriebssicherheit (größerer Überlauf) und optimaler Spuckstoffzusammensetzung (kleinerer Überlauf) des Drucksortierers darstellt. Eine andere Regel-Möglichkeit liegt darin, die Drehzahl des Rotors zu erhöhen, wenn eine zu starke Eindickung der Suspension gemeldet wird. Dazu kann bereits der an einer ausgewählten Stelle des Drucksortierers gemessene Druckimpuls-Wert ausreichen. Genauer ist die Verwendung zweier Druckimpulssignale an verschiedenen Stellen, die so gewählt sind, dass die Eindickung der Faserstoffsuspension ihren Weg durch den Drucksortierer ermittelt wird.The inventive method offers a particular advantage when the rheological properties of the fiber suspension significantly on the operation of the Impact sorter. As is known, the operating behavior depends on a Pressure sorter also depends on how far a thickening of the pressure sorter passed suspension takes place. So there are operating conditions where a relatively small overflow quantity set for sorting technology reasons should be, but operational safety no longer for rheological reasons is guaranteed. With the aid of the method according to the invention, a Operating mode can be found that requires a good compromise between Operational safety (larger overflow) and optimal reject composition (smaller overflow) of the pressure sorter. Another rule option is to increase the rotor speed if the thickening of the rotor is too strong Suspension is reported. You can do this at a selected point in the Pressure sorter measured pressure pulse value are sufficient. The use is more precise two pressure pulse signals at different points, which are chosen so that the Thickening of the fiber suspension determined their way through the pressure sorter becomes.
Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen:
- Fig. 1
- einen gemäß dem Verfahren ausgerüsteten Drucksortierer;
- Fig. 2
- qualitativ eine Drucksignalkurve.
- Fig. 1
- a pressure sorter equipped according to the method;
- Fig. 2
- qualitatively a pressure signal curve.
In Fig. 1 ist ein Drucksortierer im Schnitt dargestellt, ohne dass diese Figur als
Konstruktionszeichnung zu verstehen wäre. Im oberen Teil befindet sich ein Zulaufraum
1, der mit dem Einlaufstutzen 2 für die Faserstoffsuspension S verbunden ist. Das
eigentliche Sieb 3 ist als zylindrischer Siebkorb ausgeführt und teilt vom Zulaufraum 1
einen Gutstoffraum 4 ab, der mit dem Gutstoffauslauf 5 für den Durchlaufstrom A in
Verbindung steht. Der Zulaufraum 1 geht an seinem unteren Ende in den Rejektraum 6
über, an den eine Rejektleitung 7 angeschlossen ist, durch die der Überlaufstrom R
abfließt. Das Sieb 3 wird durch einen Rotor 8 von Verstopfungen frei gehalten, wobei
hier als Beispiel ein Nabenteil 9 mit aufgesetzten Räumflügeln 10 (in Form
hydraulischer Foils) gezeichnet ist. Bekanntlich gibt es auch andere Rotorformen, mit
denen sich das erfinderische Verfahren ebenfalls durchführen lässt. An der den
Gutstoffraum 4 abschließenden Gehäusewand 11 des Drucksortierers sind hier zwei
Druckaufnehmer 12, 13 eingezeichnet, die hydraulisch mit dem Gutstoffraum 4 in
Verbindung stehen. Dadurch können die dort in der Suspension auftretenden
Druckimpulse gemessen und an eine Messwert- Auswertungsvorrichtung 14
weitergeleitet werden. Die Druckaufnehmer 12, 13 werden mit Vorteil dort
positioniert, wo deutliche Messsignale auftreten. Das ist besonders im Gutstoffraum 4
der Fall, wo sich die von den Räumflügeln 10 erzeugten Pulsationen auswirken und der
im Allgemeinen räumlich leicht zugänglich ist. Die Rejektleitung 7 ist hier mit einem
ansteuerbaren Ventil 15 versehen, mit dem während des Betriebes des Drucksortierers
die Rejektmenge eingestellt werden kann. Dieser Regelvorgang ist nur als Beispiel
anzusehen.In Fig. 1, a pressure sorter is shown in section, without this figure as
Engineering drawing would be understood. In the upper part there is an
Die durch einen Druckaufnehmer gemessenen Drücke P, aufgetragen über der Zeit T,
sind qualitativ in Fig. 2 dargestellt. Links wird eine Kurve 16 gezeigt, die in
Abhängigkeit von Rotordrehzahl und Flügelanzahl in bestimmten Abständen deutliche
Peakwerte 17 enthält. Die Größe dieser Peakwerte ist - wie bereits erläutert wurde -
als Messwert zur Beurteilung der rheologischen Eigenschaften der Suspension
anzusehen. Je nach dem, wie groß die Zähigkeit der Suspension ist (Konsistenz,
Aschegehalt, Faserzusammensetzung), werden die Peakwerte größer oder kleiner
angezeigt. Während der linke Teil des Diagramms einen ersten Betriebszustand 18
darstellt, zeigt der zweite Teil einen geänderten Betriebszustand 19, bei dem die
Peakwerte 17' der Kurve 16' in Folge zunehmender Eindickung der Suspension kleiner
geworden sind.The pressures P measured by a pressure transducer, plotted over time T,
are shown qualitatively in Fig. 2. A
Claims (12)
dadurch gekennzeichnet, dass Druckimpulse an der Gehäusewand (11) des Drucksortierers gemessen und als Messsignal verwendet werden.Method for determining the rheological properties of a fiber suspension (S) in a pressure sorter used in pulp or paper fiber processing and provided with at least one rotor (8), which forms at least one throughflow (A) and at least one overflow (R), measuring signals being determined and be evaluated,
characterized in that pressure pulses are measured on the housing wall (11) of the pressure sorter and used as a measurement signal.
dadurch gekennzeichnet, dass aus den Druckimpulsen die Konsistenz der Faserstoffsuspension (S) im Drucksortierer ermittelt wird.Method according to claim 1,
characterized in that the consistency of the fiber suspension (S) in the pressure sorter is determined from the pressure pulses.
dadurch gekennzeichnet, dass die gemessenen Druckimpulse zur Ermittlung der im Drucksignal gespeicherten Energie zeitlich integriert werden.Method according to claim 1 or 2,
characterized in that the measured pressure pulses are integrated in time to determine the energy stored in the pressure signal.
dadurch gekennzeichnet, dass die gemessenen Drucksignale einer schnellen Fourier-Analyse unterzogen und dass die Peakwerte (17, 17') addiert werden.Method according to claim 1 or 2,
characterized in that the measured pressure signals are subjected to a fast Fourier analysis and that the peak values (17, 17 ') are added.
dadurch gekennzeichnet, dass das Messsignal zur Einstellung des am Drucksortierer abgezogenen Überlaufstromes (R) in der Weise benutzt wird, dass dessen Menge bei Abnahme der Druckimpulshöhe vergrößert und bei Zunahme verkleinert wird. The method of claim 1, 2, 3 or 4,
characterized in that the measurement signal for setting the overflow current (R) drawn off at the pressure sorter is used in such a way that its amount is increased as the pressure pulse height decreases and as it increases.
dadurch gekennzeichnet, dass das Sieb (3) zwischen dem Rotor (8) und den zur Messung der Druckimpulse dienenden Druckaufnehmern (12, 13) angeordnet ist.Method according to one of the preceding claims,
characterized in that the screen (3) is arranged between the rotor (8) and the pressure transducers (12, 13) used to measure the pressure pulses.
dadurch gekennzeichnet, dass das Sieb (3) des Drucksortierers ein zylindrischer Siebkorb ist, der radial
von innen nach außen durchströmt wird und der einen mit radial innerhalb des Siebkorbes angeordneten Räumelementen versehenen Rotor aufweist, und dass die Druckimpulse an der Innenseite der radial äußeren Gehäusewand (11) des Drucksortierers gemessen werden.Method according to one of the preceding claims,
characterized in that the screen (3) of the pressure sorter is a cylindrical screen basket which is radial
is flowed through from the inside to the outside and which has a rotor provided with clearing elements arranged radially inside the screen basket, and that the pressure pulses are measured on the inside of the radially outer housing wall (11) of the pressure sorter.
dadurch gekennzeichnet, dass die siebräumenden Räumelemente des Rotors auf derselben Seite des Siebes angeordnet sind, auf der sich auch die zur Messung der Druckimpulse dienenden Druckaufnehmer befinden.Method according to one of claims 1 to 5,
characterized in that the sieve clearing elements of the rotor are arranged on the same side of the sieve on which the pressure transducers used to measure the pressure pulses are also located.
dadurch gekennzeichnet, dass das Sieb eine ebene Scheibe ist mit einem konzentrisch zur Scheibenmitte angeordneten Rotor.Method according to one of claims 1 to 6 or 8,
characterized in that the sieve is a flat disc with a rotor arranged concentrically to the center of the disc.
dadurch gekennzeichnet, dass die Druckimpulse im Gutstoffraum (4) des Drucksortierers gemessen werden.Method according to one of the preceding claims,
characterized in that the pressure pulses are measured in the accepted material space (4) of the pressure sorter.
dadurch gekennzeichnet, dass an mindestens zwei Stellen des Gehäuses Druckimpulse gemessen werden. Method according to one of the preceding claims,
characterized in that pressure pulses are measured at at least two points in the housing.
dadurch gekennzeichnet, dass eine Stelle nahe dem Zulauf der Faserstoffsuspension in dem Drucksortierer liegt und eine andere Stelle nahe dem Auslauf aus dem Drucksortierer.A method according to claim 11,
characterized in that one point is close to the inlet of the pulp suspension in the pressure sorter and another point is close to the outlet from the pressure sorter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10304621A DE10304621B4 (en) | 2003-02-05 | 2003-02-05 | Method for determining rheological properties of a pulp suspension |
| DE10304621 | 2003-02-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1449957A1 true EP1449957A1 (en) | 2004-08-25 |
| EP1449957B1 EP1449957B1 (en) | 2009-02-11 |
Family
ID=32730765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03025880A Expired - Lifetime EP1449957B1 (en) | 2003-02-05 | 2003-11-12 | Process for determining the properties of a fibrous suspension |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1449957B1 (en) |
| AT (1) | ATE422578T1 (en) |
| DE (2) | DE10304621B4 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008006939A2 (en) * | 2006-07-10 | 2008-01-17 | Metso Paper, Inc. | Method and apparatus for determining the consistency of a suspension |
| CN106968119A (en) * | 2015-12-02 | 2017-07-21 | 相川铁工株式会社 | Paper-making screen apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0905309A2 (en) * | 1995-02-03 | 1999-03-31 | Hermann Finckh Maschinenfabrik GmbH & Co. | Screen and pressure screening device for fibre suspensions |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2018492A (en) * | 1992-06-20 | 1994-01-24 | Hermann Finckh Maschinenfabrik Gmbh & Co. | Pressure sorter for fibre suspensions |
| DE19856207A1 (en) * | 1998-12-05 | 2000-06-08 | Voith Sulzer Papiertech Patent | Assembly for cleaning a paper fiber suspension has a vertical round sieve with an upper flotation foam collection zone and a pump action for the suspension and bubbles through the sieve without a turbulence generator |
-
2003
- 2003-02-05 DE DE10304621A patent/DE10304621B4/en not_active Expired - Fee Related
- 2003-11-12 EP EP03025880A patent/EP1449957B1/en not_active Expired - Lifetime
- 2003-11-12 AT AT03025880T patent/ATE422578T1/en active
- 2003-11-12 DE DE50311169T patent/DE50311169D1/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0905309A2 (en) * | 1995-02-03 | 1999-03-31 | Hermann Finckh Maschinenfabrik GmbH & Co. | Screen and pressure screening device for fibre suspensions |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008006939A2 (en) * | 2006-07-10 | 2008-01-17 | Metso Paper, Inc. | Method and apparatus for determining the consistency of a suspension |
| WO2008006939A3 (en) * | 2006-07-10 | 2008-04-03 | Metso Paper Inc | Method and apparatus for determining the consistency of a suspension |
| CN106968119A (en) * | 2015-12-02 | 2017-07-21 | 相川铁工株式会社 | Paper-making screen apparatus |
| CN106968119B (en) * | 2015-12-02 | 2019-05-31 | 相川铁工株式会社 | Paper-making screen apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10304621B4 (en) | 2005-04-28 |
| EP1449957B1 (en) | 2009-02-11 |
| ATE422578T1 (en) | 2009-02-15 |
| DE10304621A1 (en) | 2004-08-26 |
| DE50311169D1 (en) | 2009-03-26 |
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