EP1508638A1 - Method for treating pulp containing disturbing vessel cells - Google Patents

Method for treating pulp containing disturbing vessel cells Download PDF

Info

Publication number
EP1508638A1
EP1508638A1 EP04015698A EP04015698A EP1508638A1 EP 1508638 A1 EP1508638 A1 EP 1508638A1 EP 04015698 A EP04015698 A EP 04015698A EP 04015698 A EP04015698 A EP 04015698A EP 1508638 A1 EP1508638 A1 EP 1508638A1
Authority
EP
European Patent Office
Prior art keywords
consistency
vascular cells
pulp
less
dispersion
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.)
Withdrawn
Application number
EP04015698A
Other languages
German (de)
French (fr)
Inventor
Harald Selder
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1508638A1 publication Critical patent/EP1508638A1/en
Withdrawn legal-status Critical Current

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
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • vascular cells As is well known, fresh pulps containing rapidly growing hardwoods, especially tropical hardwoods are used, so-called vascular cells (English: vessels), which have relatively large dimensions due to the climatic conditions. you Amount of pulp is usually at 3 to 5%. These vascular cells are used in the Pulp production are not removed and are in the paper made from such a pulp disturbing, because they are responsible for certain disadvantages. So it can be e.g. that happen Vascular cells break out of the paper structure, whereby the surface deteriorates and the Paper properties are impaired. Unlike the pulp fibers, they are hydrophobic Character.
  • the invention is therefore based on the object to provide a method with which it is possible to reduce the disadvantages that result from the content of vascular cells, or completely eliminate and at the same time the desired properties, such as specific volume, if possible to obtain.
  • vascular cells threatening loss of quality for the pulp produced later paper no longer occur.
  • the vast majority of vascular cells can be removed, and they may not removed vascular cells are anchored (fused) in the fiber composite so that they remain in it, even if the paper is claimed.
  • the process is usually used in stock preparation at a paper mill. It can but also already be carried out in the pulp mill after digestion.
  • Fig. 1 shows an important example for carrying out the method. That is how it works Pulp 1 in suspended form or after - not shown - dissolution in water and possibly Pre-cleaning in a thickener 2 brought to a consistency between 15 and 35%.
  • the Subsequent dispersion takes place here in a known per se from the waste paper preparation Disk disperger 3. In other cases a kneading disperger can be used.
  • the trimmings of disk dispersers have a very large number of slots and become relatively fast moving past each other.
  • An example is shown in DE 30 47 013 A1. Knetdisperger contrast (see, e.g. DE 42 37 433 A1) have a coarser structure and work with less Relative speeds.
  • the latter usually consists of a large number of highly efficient hydrocyclones, so-called cleaners, working with centrifugal fields that reach at least 200 times the gravitational acceleration.
  • cleaners working with centrifugal fields that reach at least 200 times the gravitational acceleration.
  • These are also known from waste paper processing.
  • With the reject 7 of these cleaners will be Vascular cells deposited while accepting 8 a raw material for flawless paper quality represents. Besides the benefit of Accept 8, there are no harmful vascular cells to contain the fibers in good condition, especially what drainage properties on the Paper machine and specific volume of the paper produced.
  • the in the reject 7 contained fibers may by other - not shown - Cleanerpawn possibly in combination be recovered with mechanical processing.
  • the particle size 9 of the vascular cells in the range of 0.1 to 1 mm below applied, increasing to the right.
  • the ordinate shows the area-related frequency 10 of the vascular cells found in the sample sheet, for example measured in 1 / mm 2 .
  • the diagram has four curves that represent the relationship, depending on the treatment experienced by the pulp used. The uppermost of these curves, the curve 11, represents the frequency distribution of the vascular cells in the pulp 1, ie before it has been subjected to the process according to the invention. It turns out that in the initial state, the area-related frequency 10 is relatively high for a small particle size 9 and decreases to larger particle sizes. The merely dispersed substance 4 already has a significantly better quality, which is shown schematically in the curve 13.
  • the acceptance 8 of the hydrocyclones has the distribution registered in curve 14, ie there are hardly any vascular cells present.
  • the curve 12 has been determined, which lies between the curves 11 and 13 and describes the state after hydrocyclone, bypassing the disk disperger 3. It can therefore be stated that the dispersion already achieves the stated object and that in particular an excellent pulp can be produced by the combination of both process steps, which is practically free of disturbing vascular cells.
  • the diagram according to FIG. 2 is intended to show the relationships only qualitatively. It is depending on Pulp species and choice of parameters deviations from this course possible, with the However, fundamental improvement by the inventive method clearly confirmed.
  • the accept 8 of the hydrocyclone unit 6 After dispersion and any dilution of the pulp the accept 8 of the hydrocyclone unit 6 again be added, so that a suspension 15 is formed, which is free of interfering vascular cells.
  • the in the accept 8 'of the hydrocyclone unit 6 remaining vascular cells are so small that they little disturbing even without dispersion of this partial stream.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Medicines Containing Plant Substances (AREA)

Abstract

In a papermaking process the cellular pulp contains residual non-cellular organic vessels found in natural wood. In a process to remove the non-cellular vessels from the pulp, the mixture of pulp and vessels is dispersed to a consistency of between 15 and 35 % and fractionated in a hydrocyclone at a consistency of less than 3%. Dispersal takes place at a consistency of between 15 and 35 %, and the great majority of non-cellular vessels separate in the hydrocyclone at a consistency of less than 3%. Dispersal tales place in a disc dispersal assembly requiring a specific energy input of more than 70 kWh/t at an operating temperature of less than 70C.

Description

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

Bekanntlich enthalten Frischzellstoffe, zu deren Erzeugung schnell wachsende Laubhölzer, insbesondere tropische Laubhölzer verwendet werden, sogenannte Gefäßzellen (englisch: vessels), welche in Folge der klimatischen Bedingungen relativ große Abmessungen aufweisen. Ihr Mengenanteil am Zellstoff liegt zumeist bei 3 bis 5 %. Diese Gefäßzellen werden bei der Zellstofferzeugung nicht entfernt und sind bei dem aus einem solchen Zellstoff hergestellten Papier störend, da sie für bestimmte Nachteile verantwortlich sind. So kann es z.B. passieren, dass die Gefäßzellen aus dem Papiergefüge ausbrechen, wodurch sich die Oberfläche verschlechtert und die Papiereigenschaften beeinträchtigt sind. Anders als die Zellstofffasern haben sie hydrophoben Charakter.As is well known, fresh pulps containing rapidly growing hardwoods, especially tropical hardwoods are used, so-called vascular cells (English: vessels), which have relatively large dimensions due to the climatic conditions. you Amount of pulp is usually at 3 to 5%. These vascular cells are used in the Pulp production are not removed and are in the paper made from such a pulp disturbing, because they are responsible for certain disadvantages. So it can be e.g. that happen Vascular cells break out of the paper structure, whereby the surface deteriorates and the Paper properties are impaired. Unlike the pulp fibers, they are hydrophobic Character.

Zwar ist aus der DE 198 16 621 A1 bereits ein Verfahren bekannt, um dieses Problem zu lösen, es findet aber seine Grenzen, wenn die Zellstofffasern durch die dabei angewandte Mahlung in unerwünschter Weise verändert werden.Although a method is known from DE 198 16 621 A1 to solve this problem, it but finds its limits when the pulp fibers through the applied grinding in be changed undesirably.

Der Erfindung liegt daher die Aufgabe zu Grunde, ein Verfahren zu schaffen, mit dem es möglich ist, die Nachteile, die sich aus dem Gehalt an Gefäßzellen ergeben, zu reduzieren oder ganz zu beseitigen und gleichzeitig die gewünschten Eigenschaften, wie z.B. spezifisches Volumen, möglichst zu erhalten.The invention is therefore based on the object to provide a method with which it is possible to reduce the disadvantages that result from the content of vascular cells, or completely eliminate and at the same time the desired properties, such as specific volume, if possible to obtain.

Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 genannten Merkmale in Verbindung mit denen des Oberbegriffs gelöst.This object is achieved by the features mentioned in the characterizing part of claim 1 in connection solved with those of the generic term.

Beim erfindungsgemäßen Verfahren wird erreicht, dass die durch die genannten Gefäßzellen drohenden Qualitätseinbußen für das aus dem Zellstoff später hergestellte Papier nicht mehr auftreten. Der weit überwiegende Teil der Gefäßzellen kann entfernt werden, und die eventuell nicht entfernten Gefäßzellen werden so im Faserverbund verankert (verfilzt), dass sie darin verbleiben, auch wenn das Papier beansprucht wird.In the method according to the invention is achieved that by the said vascular cells threatening loss of quality for the pulp produced later paper no longer occur. The vast majority of vascular cells can be removed, and they may not removed vascular cells are anchored (fused) in the fiber composite so that they remain in it, even if the paper is claimed.

Das Verfahren wird üblicherweise in der Stoffaufbereitung einer Papierfabrik angewendet. Es kann aber auch bereits in der Zellstofffabrik nach dem Aufschluss durchgeführt werden.The process is usually used in stock preparation at a paper mill. It can but also already be carried out in the pulp mill after digestion.

Die Erfindung wird erläutert an Hand von Zeichnungen. Dabei zeigen:

Fig. 1
ein vereinfacht dargestelltes Verfahrensbeispiel;
Fig. 2
ein Diagramm;
Fig. 3
eine vereinfacht dargestellte Verfahrensvariante.
The invention will be explained with reference to drawings. Showing:
Fig. 1
a simplified illustrated method example;
Fig. 2
a diagram;
Fig. 3
a simplified method variant shown.

Das Schema der Fig. 1 zeigt ein wichtiges Beispiel zur Durchführung des Verfahrens. So wird der Zellstoff 1 in suspendierter Form oder nach - nicht gezeigter - Auflösung in Wasser und eventueller Vorreinigung in einem Eindicker 2 auf eine Konsistenz zwischen 15 und 35 % gebracht. Die anschließende Dispergierung erfolgt hier in einem an sich aus der Altpapier-Aufbereitung bekannten Scheibendisperger 3. In anderen Fällen kann ein Knetdisperger verwendet werden. Die Garnituren von Scheibendispergern haben eine sehr große Anzahl von Schlitzen und werden relativ schnell aneinander vorbei bewegt. Ein Beispiel zeigt die DE 30 47 013 A1. Knetdisperger dagegen (s. z.B. DE 42 37 433 A1) haben eine gröbere Struktur und arbeiten mit geringeren Relativgeschwindigkeiten.The diagram of Fig. 1 shows an important example for carrying out the method. That is how it works Pulp 1 in suspended form or after - not shown - dissolution in water and possibly Pre-cleaning in a thickener 2 brought to a consistency between 15 and 35%. The Subsequent dispersion takes place here in a known per se from the waste paper preparation Disk disperger 3. In other cases a kneading disperger can be used. The trimmings of disk dispersers have a very large number of slots and become relatively fast moving past each other. An example is shown in DE 30 47 013 A1. Knetdisperger contrast (see, e.g. DE 42 37 433 A1) have a coarser structure and work with less Relative speeds.

Nach Verdünnung des dispergierten Stoffes 4 in der Bütte 16 wird bei der hier dargestellten Ausführungsform die Suspension mit einer Stoffpumpe 5 durch eine Hydrozyklonanlage 6 gepumpt. Letztere besteht im Regelfall aus einer Vielzahl hochwirksamer Hydrozyklone, sogenannte Cleaner, die mit Zentrifugalfeldern arbeiten, die mindestens das 200-Fache der Erdbeschleunigung erreichen. Auch diese sind aus der Altpapier-Aufbereitung bekannt. Mit dem Rejekt 7 dieser Cleaner werden Gefäßzellen abgeschieden, während der Akzept 8 einen Rohstoff für einwandfreie Papierqualität darstellt. Neben dem Vorteil des Akzeptes 8, keine schädlichen Gefäßzellen zu enthalten, sind auch die Fasern in gutem Zustand, insbesondere was Entwässerungseigenschaften auf der Papiermaschine und spezifisches Volumen des erzeugten Papiers betrifft. Die im Rejekt 7 enthaltenen Fasern können durch weitere - nicht gezeigte - Cleanerstufen eventuell in Verbindung mit mechanischer Bearbeitung zurückgewonnen werden.After dilution of the dispersed substance 4 in the chest 16 is shown here Embodiment pumped the suspension with a fuel pump 5 through a hydrocyclone unit 6. The latter usually consists of a large number of highly efficient hydrocyclones, so-called cleaners, working with centrifugal fields that reach at least 200 times the gravitational acceleration. These are also known from waste paper processing. With the reject 7 of these cleaners will be Vascular cells deposited while accepting 8 a raw material for flawless paper quality represents. Besides the benefit of Accept 8, there are no harmful vascular cells to contain the fibers in good condition, especially what drainage properties on the Paper machine and specific volume of the paper produced. The in the reject 7 contained fibers may by other - not shown - Cleanerstufen possibly in combination be recovered with mechanical processing.

Im Diagramm der Fig. 2 ist die Partikelgröße 9 der Gefäßzellen im Bereich von 0,1 bis 1 mm unten aufgetragen, nach rechts zunehmend. Die Ordinate zeigt die flächenbezogene Häufigkeit 10 der im Probeblatt gefundenen Gefäßzellen, z.B. gemessen in 1/mm2. Das Diagramm weist vier Kurven auf, die den Zusammenhang darstellen, je nach dem welche Behandlung der eingesetzte Zellstoff erfahren hat. Die oberste dieser Kurven, die Kurve 11, stellt die Häufigkeitsverteilung der Gefäßzellen im Zellstoff 1 dar, also bevor dieser dem erfindungsgemäßen Verfahren unterzogen wurde. Dabei zeigt sich, dass im Ausgangszustand die flächenbezogene Häufigkeit 10 bei einer kleinen Partikelgröße 9 relativ hoch ist und zu größer werdenden Partikelgrößen abfällt. Der lediglich dispergierte Stoff 4 hat bereits eine deutlich bessere Qualität, was schematisch in der Kurve 13 dargestellt ist. Nach Durchführung des Verfahrens in der in Fig. 1 gezeigten Form hat der Akzept 8 der Hydrozyklone die in Kurve 14 eingetragene Verteilung, d.h. es sind kaum noch Gefäßzellen vorhanden. In einem Vergleichsversuch ist noch die Kurve 12 ermittelt worden, die zwischen den Kurven 11 und 13 liegt und die den Zustand nach Hydrozyklon unter Umgehung des Scheibendispergers 3 beschreibt. Man kann also feststellen, dass die Dispergierung bereits die gestellte Aufgabe löst und dass insbesondere durch die Kombination beider Verfahrensschritte ein ausgezeichneter Faserstoff erzeugt werden kann, der praktisch frei ist von störenden Gefäßzellen. Selbst wenn im Akzept 8 noch ein Rest von Gefäßzellen vorhanden ist, sind diese sehr stark mit den Zellstofffasern verfilzt, wie es sich mit Hilfe von rasterelekronischen Aufnahmen von aus dieser Suspension gebildeten Blättern klar erkennen ließ, so dass auch von diesen keine qualitätsschädigende Wirkung mehr ausgehen kann.In the diagram of FIG. 2, the particle size 9 of the vascular cells in the range of 0.1 to 1 mm below applied, increasing to the right. The ordinate shows the area-related frequency 10 of the vascular cells found in the sample sheet, for example measured in 1 / mm 2 . The diagram has four curves that represent the relationship, depending on the treatment experienced by the pulp used. The uppermost of these curves, the curve 11, represents the frequency distribution of the vascular cells in the pulp 1, ie before it has been subjected to the process according to the invention. It turns out that in the initial state, the area-related frequency 10 is relatively high for a small particle size 9 and decreases to larger particle sizes. The merely dispersed substance 4 already has a significantly better quality, which is shown schematically in the curve 13. After carrying out the process in the form shown in FIG. 1, the acceptance 8 of the hydrocyclones has the distribution registered in curve 14, ie there are hardly any vascular cells present. In a comparative experiment, the curve 12 has been determined, which lies between the curves 11 and 13 and describes the state after hydrocyclone, bypassing the disk disperger 3. It can therefore be stated that the dispersion already achieves the stated object and that in particular an excellent pulp can be produced by the combination of both process steps, which is practically free of disturbing vascular cells. Even if there is still a residue of vascular cells in the accept 8, they are very heavily entangled with the pulp fibers, as can be clearly seen with the aid of grid-electronic recordings of leaves formed from this suspension, so that no quality-damaging effects emanate from them can.

Das Diagramm gemäß der Fig. 2 soll die Zusammenhänge nur qualitativ zeigen. Es sind je nach Zellstoffart und Wahl der Parameter Abweichungen von diesem Verlauf möglich, wobei sich die grundsätzliche Verbesserung durch das erfindungsgemäße Verfahren jedoch eindeutig bestätigt.The diagram according to FIG. 2 is intended to show the relationships only qualitatively. It is depending on Pulp species and choice of parameters deviations from this course possible, with the However, fundamental improvement by the inventive method clearly confirmed.

Eine Möglichkeit, das Problem der Gefäßzellen mit einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens zu lösen, zeigt die Fig. 3. Demnach werden die Zellstofffasern in der Hydrozyklonanlage 6 wiederum von Gefäßzellen gereinigt, aber bereits vor der Dispergierung. Dann ist der Rejekt 7' der Hydrozyklonanlage 6 stark mit Gefäßzellen angereichert, so dass die anschließende Dispergerbehandlung gezielt auf die Zerkleinerung und Verfilzung dieser Gefäßzellen gerichtet werden kann. Wegen der weitaus geringeren Menge bleiben Energieverbrauch und apparativer Aufwand in engen Grenzen, so dass diese Variante besonders wirtschaftlich ist. Auch Faserverluste und Faserschädigung lassen sich noch leichter vermeiden. Nach der Dispergierung und eventuellen Verdünnung kann der Faserstoff dem Akzept 8 der Hydrozyklonanlage 6 wieder zugegeben werden, so dass eine Suspension 15 entsteht, die frei ist von störenden Gefäßzellen. Die im Akzept 8' der Hydrozyklonanlage 6 enthaltenen restlichen Gefäßzellen sind so klein, dass sie auch ohne Dispergierung dieses Teilstromes wenig stören.One possibility, the problem of vascular cells with a further embodiment of the The process according to the invention is to be solved, as shown in FIG. 3. Accordingly, the pulp fibers in the Hydrocyclone unit 6 again cleaned by vascular cells, but even before the dispersion. Then the reject 7 'of the hydrocyclone unit 6 is strongly enriched with vascular cells, so that the subsequent Dispergerbehandlung targeted to the crushing and entanglement of these vascular cells can be directed. Because of the much smaller amount of energy consumption and Apparent effort within narrow limits, so that this variant is particularly economical. Also Fiber losses and fiber damage are even easier to avoid. After dispersion and any dilution of the pulp the accept 8 of the hydrocyclone unit 6 again be added, so that a suspension 15 is formed, which is free of interfering vascular cells. The in the accept 8 'of the hydrocyclone unit 6 remaining vascular cells are so small that they little disturbing even without dispersion of this partial stream.

Claims (8)

Verfahren zur Behandlung einer störende Gefäßzellen enthaltenden, insbesondere aus Laubholz hergestellten Frischzellstoffsuspension, durch das die Schädlichkeit der Gefäßzellen ausreichend beseitigt wird,
dadurch gekennzeichnet, dass das Gemisch aus Zellstofffasern und Gefäßzellen bei einer hohen Konsistenz, vorzugsweise zwischen 15 und 35 % dispergiert wird.Process for the treatment of a fresh pulp suspension containing disturbing vascular cells, in particular made of hardwood, by means of which the harmfulness of the vascular cells is sufficiently eliminated,
characterized in that the mixture of pulp fibers and vascular cells is dispersed at a high consistency, preferably between 15 and 35%. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass das Gemisch nach dem Dispergieren bei einer niedrigen Konsistenz, vorzugsweise unter 3 % in Hydrozyklonen fraktioniert wird und dass dabei zumindest der überwiegende Teil der Gefäßzellen bei einer Konsistenz unter 3 % in Hydrozyklonen ausgeschieden wird.Method according to claim 1,
characterized in that the mixture is fractionated after dispersion at a low consistency, preferably below 3% in hydrocyclones, and that at least the major part of the vascular cells is excreted in hydrocyclones at a consistency of less than 3%. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass aus dem Gemisch bei einer Konsistenz unter 3 % der überwiegende Teil der Gefäßzellen als Rejekt (7') von Hydrozyklonen ausgeschieden und dass der Rejekt (7') anschließend bei einer Konsistenz zwischen 15 und 35 % dispergiert wird.Method according to claim 1,
characterized in that from the mixture at a consistency of less than 3% of the majority of vascular cells as a reject (7 ') of hydrocyclones excreted and that the reject (7') is then dispersed at a consistency between 15 and 35%. Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, dass die Dispergierung in einem Scheibendisperger bei einer Konsistenz von 25 bis 35 % durchgeführt wird und dass dabei eine spezifische Arbeit von mehr als 70 kWh/t übertragen wird.Method according to claim 1, 2 or 3,
characterized in that the dispersion is carried out in a Scheibendisperger at a consistency of 25 to 35% and that while a specific work of more than 70 kWh / t is transmitted. Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, dass die Dispergierung in einem Knetdisperger bei einer Konsistenz von 25 bis 35 % durchgeführt wird und dass dabei eine spezifische Arbeit von mehr als 90 kWh/t übertragen wird.Method according to claim 1, 2 or 3,
characterized in that the dispersion is carried out in a Knetdisperger at a consistency of 25 to 35% and that while a specific work of more than 90 kWh / t is transmitted. Verfahren nach Anspruch 1, 2, 3, 4 oder 5,
dadurch gekennzeichnet, dass die Dispergierung bei einer Temperatur unter 70° C durchgeführt wird.Method according to claim 1, 2, 3, 4 or 5,
characterized in that the dispersion is carried out at a temperature below 70 ° C. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, dass am Zulauf in die Hydrozyklone eine Konsistenz von weniger als 1,3 %, vorzugsweise unter 0,8 %, eingestellt wird.Method according to one of the preceding claims,
characterized in that at the inlet to the hydrocyclones a consistency of less than 1.3%, preferably below 0.8%, is set. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, dass am Hydrozyklon ein Rejektstrom kontinuierlich abgezogen wird, dessen Größe 10 - 30 Vol% des Zulaufstromes zum Hydrozyklon entspricht.Method according to one of the preceding claims,
characterized in that at the hydrocyclone a Rejektstrom is withdrawn continuously, whose size corresponds to 10 - 30 vol% of the feed stream to the hydrocyclone.
EP04015698A 2003-08-18 2004-07-03 Method for treating pulp containing disturbing vessel cells Withdrawn EP1508638A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003137821 DE10337821B3 (en) 2003-08-18 2003-08-18 Process to remove non-cellular matter from cellular paper pulp cellulose and foreign matter are dispersed and fractionated
DE10337821 2003-08-18

Publications (1)

Publication Number Publication Date
EP1508638A1 true EP1508638A1 (en) 2005-02-23

Family

ID=33521565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04015698A Withdrawn EP1508638A1 (en) 2003-08-18 2004-07-03 Method for treating pulp containing disturbing vessel cells

Country Status (4)

Country Link
EP (1) EP1508638A1 (en)
AU (1) AU2004203404A1 (en)
BR (1) BRPI0403189A (en)
DE (1) DE10337821B3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1889971A1 (en) * 2006-08-18 2008-02-20 Voith Patent GmbH Method for treating a paper fibre mixture

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006012835B3 (en) * 2006-03-21 2007-11-15 Voith Patent Gmbh Process for the treatment of pulp containing disruptive vascular cells
US10385508B2 (en) * 2016-03-24 2019-08-20 The Procter & Gamble Company Process for producing strong and soft tissue and towel products

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568404A1 (en) * 1992-04-17 1993-11-03 Kimberly-Clark Corporation Method of treating papermaking fibers for making tissue
DE19816621A1 (en) * 1998-04-15 1999-11-04 Voith Sulzer Papiertech Patent Reducing tropical, hardwood cellulose using rotary blade refiner
EP1147804A1 (en) * 2000-04-11 2001-10-24 Voith Paper Patent GmbH Apparatus to disperse a high consistency paper fibers slurry and linings for this apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT375417B (en) * 1980-11-25 1984-08-10 Escher Wyss Gmbh DISPERSING DEVICE FOR THE TREATMENT OF WASTE PAPER
DE4237433C2 (en) * 1992-11-06 1994-05-11 Voith Gmbh J M Kneading machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568404A1 (en) * 1992-04-17 1993-11-03 Kimberly-Clark Corporation Method of treating papermaking fibers for making tissue
DE19816621A1 (en) * 1998-04-15 1999-11-04 Voith Sulzer Papiertech Patent Reducing tropical, hardwood cellulose using rotary blade refiner
EP1147804A1 (en) * 2000-04-11 2001-10-24 Voith Paper Patent GmbH Apparatus to disperse a high consistency paper fibers slurry and linings for this apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1889971A1 (en) * 2006-08-18 2008-02-20 Voith Patent GmbH Method for treating a paper fibre mixture

Also Published As

Publication number Publication date
BRPI0403189A (en) 2005-05-24
DE10337821B3 (en) 2005-01-13
AU2004203404A1 (en) 2005-03-10

Similar Documents

Publication Publication Date Title
DE69412028T2 (en) Method and device for cleaning waste paper pulp
EP1728918A2 (en) Proces for removing impurities from an aqueous fibrous suspension
DE2053419A1 (en) Method and apparatus for grinding paper stock
EP1799903A1 (en) Method for fractionating an aqueous paper fibre suspension and hydrocyclone for carrying out said method
DE69923603T2 (en) RECYCLING TMP FIBROUS TO SC / LWC QUALITY
DE2834907C2 (en) Process for the production of wood pulp
EP1798329B1 (en) Method for removing impurities from an aqueous fibre suspension
DE102007029806A1 (en) Process for the treatment of waste paper
DE69912761T2 (en) METHOD AND DEVICE FOR PRODUCING CELLULOSE MASH WITH IMPROVED PROPERTIES
WO2006108508A1 (en) Method for preparing paper-fibre raw material
AT501932A1 (en) METHOD FOR RECONSTRUCTING ALTPAPER
DE102008063785A1 (en) Process for the treatment of waste paper-containing raw materials to form a fibrous suspension suitable for the production of graphic papers
DE10337821B3 (en) Process to remove non-cellular matter from cellular paper pulp cellulose and foreign matter are dispersed and fractionated
DE10135699A1 (en) Process for processing dry waste
DE3029978A1 (en) METHOD FOR CLEANING WOODEN GRIND AND DEVICE FOR CARRYING OUT THE METHOD
DE102005016192A1 (en) Process for dissolving and cleaning contaminant-containing paper tubes
DE60214421T2 (en) METHOD FOR SEPARATING COLORING MATERIAL, IN PARTICULAR PRINTING COLOR, FROM FIBROUS MATERIAL
DE10132743A1 (en) Recovery of at least two different paper fractions, from pulped used paper for recycling, the fraction which is less well pulped is separated for further intensive pulping into the second fraction
DE3409121C2 (en)
EP1921205A1 (en) Method for removing disturbing fibres, fibre fragments or vessel cells from an aqueous fibrous solution
DE19938976A1 (en) Process for the preparation of a paper fiber raw material containing wood pulp
EP0828026B1 (en) Process for cleaning a pulp of primary fibres
DE69931007T2 (en) Process and plant for the production of paper pulp
DE102008013458A1 (en) Method for eliminating extraneous material from aqueous fiber suspension, particularly waste paper suspension, involves accomplishing fractionation of aqueous fiber suspension for forming fine fraction and coarse fraction
DE19808355A1 (en) Paper fiber suspension grinding operation for papermaking fibers

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 IT LI LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL HR LT LV MK

17P Request for examination filed

Effective date: 20050823

AKX Designation fees paid

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

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VOITH PATENT GMBH

17Q First examination report despatched

Effective date: 20070702

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20091124