EP1108813A1 - Verfahren zum Fraktionieren einer Papierfasersuspension - Google Patents
Verfahren zum Fraktionieren einer Papierfasersuspension Download PDFInfo
- Publication number
- EP1108813A1 EP1108813A1 EP00126763A EP00126763A EP1108813A1 EP 1108813 A1 EP1108813 A1 EP 1108813A1 EP 00126763 A EP00126763 A EP 00126763A EP 00126763 A EP00126763 A EP 00126763A EP 1108813 A1 EP1108813 A1 EP 1108813A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber
- separation step
- fibers
- fraction
- wet sieving
- 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.)
- Granted
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
-
- 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
Definitions
- the invention relates to a method according to the preamble of claim 1.
- WO 95/00702 A1 describes a method which is used for the Production of tissue paper to produce particularly suitable fibrous material.
- a two-stage separation process proposed with a first fractionation stage in which the fibers according to their Fiber length can be classified.
- the short fiber fraction of this first Fractionation step is then another with the help of centrifugal forces Subjected to fractionation to the length-related fiber weight (coarseness) to significantly reduce.
- This process is used to produce a special for the Tissue production optimized, particularly soft fiber.
- the invention is based on the object of creating a method with which it succeeds in fractionating a fiber so far that certain properties of its Components even better exploited in the subsequent paper production can be.
- the separation into wood-rich and wood-poor should Varieties can be improved.
- Another application is the separation into early wood and Late wood parts of pulp.
- the process enables namely by specified combination of at least two separation steps a particularly effective Separation of pulp, since these are separated one after the other with specially set Separation effect can be carried out.
- the one executed first Fiber length separation step the long fibers from the short fibers at least up to separated to a certain extent.
- Sieve fractionators e.g. Sieve fractionators.
- you can such machines tend to have high flow speeds parallel to Screen area are operated.
- slotted screens very fine slits (e.g. 0.1 mm) often a particularly pronounced length fractionation. Because in many cases low-lignin pulp fibers are longer than the wood pulp fibers Long fiber fraction be less lignin than the short fiber fraction. This side effect of Length fractionation is not always desirable.
- a second one Separation step which is designed so that more flexible fibers from the stiffer Fibers are separated, even if they are about the same length or about the same Have fiber length weight.
- the latter is the length of the outstretched - fiber-related mass, e.g. in milligrams per meter.
- sieve fractionators can be used, e.g. are equipped with less fine slot openings and relatively high Flow rate can be operated through the slot openings.
- the the prevailing separation characteristic of this further separation step is therefore not the length, but the flexibility of the fibers.
- Such a fractionation is with one narrow fiber length spectrum - as a result of a previous one Fiber length separation step - particularly effective.
- boundary layer fractionators are also known, in which long and Short fibers are separated.
- the method according to the invention is not in the order: first Fiber length fractionation and then separation based on flexibility of the fibers.
- the optimal order depends on the fiber materials, especially theirs Composition, the separators and the requirements for the finished Paper pulp.
- the paper fiber suspension S is one Fiber length separation step 1 supplied, in which the suspension in a short fibers enriched short fiber fraction A1 and one enriched with long fibers Long fiber fraction A2 is divided.
- both Fractions - i.e. both the short fiber fraction A1 and the long fiber fraction A2 - each passed to a further separation step 2 or 3.
- These are more Separation steps 2 and 3 are intended to re-feed the suspension fractionate, in such a way that one fraction with more flexible and one with stiffer fibers.
- the term soft fraction was used for the flexible variety A2, A3 and for the other the term hard fraction R2, R3 selected.
- the pulp fibers obtained by chemical digestion flexible and low in lignin i.e.
- a fiber length separation step 1 and a further separation step 2 with the help of a sieve fractionator only indicated carried out.
- the paper fiber suspension S from a chest 5 over a Pump 6 pumped through the fractionators.
- Fiber length separation step 1 creates a pass that forms the short fiber fraction A1, as well as an overflow, namely the long fiber fraction A2.
- the short fiber fraction A1 will then subjected to a further separation step 2, whereby the soft fraction A2 as Pass and the hard fraction R2 as an overflow occurs.
- a long fiber material collects in the chest 7, in the chest 8 a fabric with rigid, e.g. lignin-rich short fibers and in the chest 9 a material with flexible, e.g. low lignin Short fibers.
- a dashed line 4 indicates a possibility that Soft fraction A2, in which the flexible long fibers of the second separation step 2 be enriched with the soft fraction A3 from the third separation step 3 into one summarize common variety in the chest 10. This then contains one flexible fiber with a wide range of lengths, e.g. with mostly chemical disrupted pulp.
- Fig. 4 is a schematic representation of the enrichment of late wood pulp fibers taking advantage of their lower flexibility. You can clearly see that through the first performed fiber length separation step 1, a slight increase in the late wood content 11th is achieved in the hard fraction R1. When fractionating again in another Separation step 2 can significantly improve the result.
- a sieve symbol is shown on the right edge of the diagram with the inflow in the form the paper fiber suspension S, which is divided into the continuous fraction D and the Overflow fraction U.
- the diagram shows qualitatively, like such a sieve fractionator at an assumed operating point 18 den Pulp content in the fractions formed and how to move through set parameters can influence this shift. It is without further accept that the fiber raw material examined here is the first Separation step even brought an enrichment of stiff fibers in the run. This is due to the fact that the stiff fibers are average in many raw materials the shorter ones are too. This is just one example of how to interpret one for differences in the fiber flexibility directed fractionation step. Other options are in the design of the fractionation openings of wet sieves.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Description
- Fig. 1
- ein Schema, welches das erfindungsgemäße Verfahren grundsätzlich darstellt;
- Fig. 2
- ein vereinfachtes Anlagenschema;
- Fig. 3
- ein weiteres vereinfachtes Anlagenschema;
- Fig. 4
- Diagramm zur zweistufigen Fraktionierung;
- Fig. 5
- ein Diagramm zur Fahrweise eines Fraktionators.
Claims (9)
- Verfahren zum Fraktionieren einer Papierfasersuspension (S), bei dem diese mindestens einem Faserlängen-Trennschritt (1) unterzogen wird, welcher mindestens eine mit Kurzfasem angereicherte Kurzfaserfraktion (A1)und mindestens eine mit Langfasern angereicherte Langfaserfraktion (R1) erzeugt,
dadurch gekennzeichnet,
dass der Faserlängen-Trennschritt (1) mit mindestens einem weiteren Trennschritt (2, 3) kombiniert wird, durch den eine mit flexiblen Fasern angereicherte Weichfraktion (A2, A3) und eine mit steifen Fasern angereicherte Hartfraktion (R2, R3) gebildet wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass der Faserlängen-Trennschritt (1) zuerst durchgeführt wird und dass dessen Kurzfaserfraktion (A1) in einen weiteren Trennschritt (2) gelangt. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass der Faserlängen-Trennschritt (1) zuerst durchgeführt wird und dass dessen Langfaserfraktion (A2) in einen weiteren Trennschritt (3) gelangt. - Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
dass der Faserlängen-Trennschritt (1) als Nasssiebung durchgeführt wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass mindestens ein weiterer Trennschritt (2, 3) als Nasssiebung durchgeführt wird. - Verfahren nach Anspruch 4 und 5,
dadurch gekennzeichnet,
dass die in der ersten Nasssiebung eingestellte Siebdurchtrittsgeschwindigkeit geringer ist als die in der zweiten Nasssiebung. - Verfahren nach Anspruch 4, 5 oder 6,
dadurch gekennzeichnet,
dass mindestens eine Nasssiebung mit einem Schlitzsieb durchgeführt wird. - Verfahren nach Anspruch 4 und 5,
dadurch gekennzeichnet,
dass in der ersten Nasssiebung ein Schlitzsieb mit geringerer Schlitzweite als in der zweiten Nasssiebung verwendet wird. - Verfahren nach Anspruch 8,
dadurch gekennzeichnet,
dass die Schlitzweite in der ersten Nasssiebung 0,1 - 0,2 mm und die in der zweiten Nasssiebung 0,3 - 0,6 mm beträgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19960218 | 1999-12-14 | ||
DE19960218A DE19960218A1 (de) | 1999-12-14 | 1999-12-14 | Verfahren zum Fraktionieren einer Papierfasersuspension |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1108813A1 true EP1108813A1 (de) | 2001-06-20 |
EP1108813B1 EP1108813B1 (de) | 2004-08-18 |
Family
ID=7932593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00126763A Expired - Lifetime EP1108813B1 (de) | 1999-12-14 | 2000-12-06 | Verfahren zum Fraktionieren einer Papierfasersuspension |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1108813B1 (de) |
AT (1) | ATE274097T1 (de) |
DE (2) | DE19960218A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1710347A1 (de) * | 2005-04-08 | 2006-10-11 | Voith Patent GmbH | Verfahren zum Auflösen und Reinigen von störstoffhaltigen Papierrohstoffen |
WO2006108508A1 (de) * | 2005-04-15 | 2006-10-19 | Voith Patent Gmbh | Verfahren zur aufbereitung von papierfaser-rohstoffen |
WO2008031921A1 (en) * | 2006-09-11 | 2008-03-20 | M-Real Oyj | Method of manufacturing a multilayer fibrous product |
DE102012216950A1 (de) * | 2012-09-21 | 2014-03-27 | Voith Patent Gmbh | Fraktionierung |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008063785A1 (de) | 2008-12-18 | 2010-06-24 | Voith Patent Gmbh | Verfahren zur Aufbereitung von Altpapier enthaltenden Rohstoffen zu einer zur Erzeugung graphischer Papiere geeigneten Faserstoffsuspension |
DE102017110815A1 (de) * | 2017-05-18 | 2018-11-22 | Voith Patent Gmbh | Verfahren zur Behandlung eines Fasersuspensionsstromes |
DE102019125317A1 (de) * | 2019-09-20 | 2021-03-25 | Voith Patent Gmbh | Reinigungsverfahren |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995000702A1 (en) * | 1993-06-24 | 1995-01-05 | The Procter & Gamble Company | Cellulose pulps having improved softness potential and method of making such pulps |
-
1999
- 1999-12-14 DE DE19960218A patent/DE19960218A1/de not_active Withdrawn
-
2000
- 2000-12-06 EP EP00126763A patent/EP1108813B1/de not_active Expired - Lifetime
- 2000-12-06 DE DE50007459T patent/DE50007459D1/de not_active Expired - Lifetime
- 2000-12-06 AT AT00126763T patent/ATE274097T1/de active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995000702A1 (en) * | 1993-06-24 | 1995-01-05 | The Procter & Gamble Company | Cellulose pulps having improved softness potential and method of making such pulps |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1710347A1 (de) * | 2005-04-08 | 2006-10-11 | Voith Patent GmbH | Verfahren zum Auflösen und Reinigen von störstoffhaltigen Papierrohstoffen |
WO2006108508A1 (de) * | 2005-04-15 | 2006-10-19 | Voith Patent Gmbh | Verfahren zur aufbereitung von papierfaser-rohstoffen |
WO2008031921A1 (en) * | 2006-09-11 | 2008-03-20 | M-Real Oyj | Method of manufacturing a multilayer fibrous product |
CN101553622B (zh) * | 2006-09-11 | 2011-12-14 | M-真实公司 | 制造多层纤维产品的方法 |
DE102012216950A1 (de) * | 2012-09-21 | 2014-03-27 | Voith Patent Gmbh | Fraktionierung |
CN104755672A (zh) * | 2012-09-21 | 2015-07-01 | 福伊特专利有限公司 | 分馏方法 |
CN104755672B (zh) * | 2012-09-21 | 2017-03-08 | 福伊特专利有限公司 | 分馏方法 |
Also Published As
Publication number | Publication date |
---|---|
DE19960218A1 (de) | 2001-06-28 |
ATE274097T1 (de) | 2004-09-15 |
DE50007459D1 (de) | 2004-09-23 |
EP1108813B1 (de) | 2004-08-18 |
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