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EP2898143A1 - Fractionnement - Google Patents

Fractionnement

Info

Publication number
EP2898143A1
EP2898143A1 EP13752884.0A EP13752884A EP2898143A1 EP 2898143 A1 EP2898143 A1 EP 2898143A1 EP 13752884 A EP13752884 A EP 13752884A EP 2898143 A1 EP2898143 A1 EP 2898143A1
Authority
EP
European Patent Office
Prior art keywords
pulp suspension
fiber fraction
rotor
fractionation
jet
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Withdrawn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
EP13752884.0A
Other languages
German (de)
English (en)
Inventor
Wolfgang Mannes
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 EP2898143A1 publication Critical patent/EP2898143A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • 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
    • D21D5/22—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in apparatus with a vertical axis
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D99/00—Subject matter not provided for in other groups of this subclass

Definitions

  • the invention relates to a process for the fractionation of a pulp suspension produced from waste paper or scrap of a machine for the production of multilayer or multilayer fibrous webs, wherein a long fiber fraction with predominantly long fibers and a short fiber fraction with predominantly short fibers is formed.
  • the recycling of waste paper is practiced for a long time. It is also common not only to clean the pulp suspension but also to fractionate. Fractionation is usually done mostly through sorters.
  • Fractionationation allows the higher-grade long-fiber fraction to be used as needed.
  • the purified fibers are referred to as DIP and reused alone or together with pulp in the formation of fibrous webs.
  • the reprocessing committee so far includes the dissolution and the exclusive reuse in a layer or layer with low demands on the pulp quality.
  • the object of the invention is therefore to allow the discharge of high-quality pulp to improve the efficiency of reuse.
  • this object is achieved in that the kappa number of the long fiber fraction is less than that of the pulp suspension to be fractionated. Since the fractionation is now not only based on the fiber length but also the kappa number of the long fiber fraction is taken into account, there is a significant increase in the quality of the long fiber fraction.
  • the reduced kappa number means over known fractionation processes that more flexible fibers with improved bondability are accumulated in the long fiber fraction. As a result, so can the strength of the fibrous web or layer or layer produced from this long fiber fraction be significantly improved, so that can be dispensed with the use of virgin fibers.
  • the mean length-weighted fiber length of the long fiber fraction is at least 0.4 mm, preferably at least 0.5 mm larger than that of the short fiber fraction.
  • the aim should be that the mean length-weighted fiber length of the long fiber fraction is at least 1.4 mm and otherwise at least 1.6 mm for a pulp suspension formed at least partially from printed waste paper.
  • the pulp suspension should impinge on at least one rotor in the form of a free jet.
  • a beam of pulp suspension is directed to the rotor blades of a rotor for fractionation, wherein the jet direction with the rotation axis forms an angle of less than 45 ° and longer adhering to the rotor blades fibers due to Centrifugal force are thrown off the rotor blades and collected separately.
  • fractionation is very efficient, as mainly only the long, flexible fibers adhere to the rotor blades, collect, slide radially outward on the rotor blades and are thrown off from there.
  • the beam direction of the pulp suspension jet should be approximately parallel to the axis of rotation of the rotor.
  • the jet of pulp suspension is accelerated before striking the rotor blades. This acceleration causes alignment of the fibers in the flow direction, which assists in capturing the long fibers by the rotor blades.
  • the speed of the pulp suspension jet when hitting the rotor blades is between 3 and 20 m / s and / or the peripheral speed of the rotor blades is between 10 and 70, preferably between 20 and 40 m / s. In this way it is ensured that if possible only the long, flexible fibers adhere to the rotor blades, whereby the proportion of removed long fibers can be increased by increasing the peripheral speed.
  • the pulp suspension jet should extend at least predominantly, preferably exclusively only over a radially inner region of the rotor blades.
  • a comprehensive use of the rotor blades can be achieved, in particular, if the pulp suspension jet has an annular cross-section enclosing the axis of rotation of the rotor. It is advantageous if the annular pulp suspension jet has a ring thickness between 1 and 5 mm. If the pulp suspension is formed from scrap of a machine, in particular a machine for producing multilayer or multilayer fibrous webs, then this pulp suspension should be led to fractionation at a pulp density between 1, 0 and 5.0%. This high consistency leads due to the lower thickening to a much higher efficiency.
  • the long fiber fraction should comprise at least 10% of the fiber content of the reject pulp suspension.
  • the fractionation enables the separation of a better pulp quality in the form of the long fiber fraction, which can then be reused in a layer or layer with higher demands.
  • the use with other paper machines is possible. This also means that both fractions are used to form different layers or layers of the fibrous web.
  • the effort for the ejection of high-quality pulp can be significantly reduced if the pulp suspension prepared from waste paper before the actual fractionation an additional, known fractionation for pre-fractionation goes through, which long fiber fraction with increased length Fibers and a short fiber fraction with increasingly short fibers forms, with only the long fiber fraction is continued to fractionation.
  • the pulp suspension produced from waste paper flows along the rotor with a pulp density of between 0.5 and 4.0%.
  • FIG. 1 shows a schematic cross section through a fractionating device 5 according to the invention
  • Figure 2 a plant scheme for the treatment of waste
  • Figure 3 a plant scheme for waste paper processing.
  • fractionating device 5 for forming a long fiber fraction 1 1 with predominantly long fibers and a short fiber fraction 12 with predominantly short fibers is particularly suitable because of the high separating sharpness shown in Figure 1 device.
  • annular pulp suspension jet is formed from the pulp suspension 1 via a centrally arranged shaped body 8 and directed onto the rotor blades 2 of a rotor.
  • the gap between the nozzle housing 13 bounding the outside of the jet and the shaped body 8 is increased. This is in the example shown simply by a displacement of the nozzle housing thirteenth possible contrary to the flow direction.
  • the molded body 8 causes an increase in the flow velocity of the pulp suspension 1 and thereby an increased orientation of the fibers in the flow direction, which supports the detection of long fibers by the rotor blades 2.
  • the rotor is driven here by a motor 9 arranged below.
  • the jet direction of the pulp suspension jet coincides with the rotor axis 3 of the rotor, wherein the velocity of the pulp suspension jet when hitting the rotor blades 2 is between 3 and 15 m / s and the peripheral speed of the rotor blades 2 is between 20 and 30 m / s.
  • the centrifuging is not affected by the pulp suspension jet, the pulp suspension jet is directed only to the radially inner part of the rotor blades 2, wherein the ring thickness is between 1 and 5 mm and the rotor blades 2 have a length between 10 and 20 mm.
  • the rotor with the rotor blades 2 sweeps over a circular area with a diameter between 300 and 2000 mm, which also ensures a sufficient capacity for an annular pulp suspension jet in conjunction with the desired flow rate. Since the annular pulp suspension jet is arranged coaxially to the axis of rotation 3, results in an optimal and uniform effect.
  • the rotor blades 2 have a wing edge having a width with respect to the jet direction between 1 and 5 mm.
  • the vane edge may be radially outwardly inclined in the beam direction of the pulp suspension jet.
  • this fractionating device 5 1 1 not only long, but in particular also flexible fibers can be accumulated in the long fiber fraction. Accordingly, the kappa number of the long fiber fraction can be lowered to below the capping number of the pulp suspension 1 and the short fiber fraction 12.
  • the average length-weighted fiber length of the long fiber fraction 1 1 is at least 0.5 mm larger than that of the short fiber fraction 12.
  • the mean length-weighted fiber length of the long-fiber fraction 11 is at least 1.6 mm.
  • the fibrous web is intended, by way of example, to consist of three separate headboxes 10a, 10b, 10c Layers are produced.
  • the material flows supplied to the headboxes 10a, 10b, 10c may differ from one another with regard to their composition, in particular with regard to fiber content, fiber type, fiber properties, fine and filler content and consistency.
  • The, in the production of multi-ply fibrous web resulting scrap is usually discharged into an area below the paper machine and there dissolved in a reject pulper 4 again.
  • the pulp suspension 1 formed from the broke can then be conducted at a pulp density between 1, 0 and 5.0% to a fractionating device 5 according to the invention.
  • the fractionating 5 it comes, as already mentioned, for splitting a long fiber fraction 1 1 with a high proportion of long, flexible fibers and a less valuable short fiber fraction 12 with a high proportion of short fibers.
  • the long fiber fraction 1 1 comprises at least 10% of the fiber content of the broke in order to ensure sufficient economy.
  • FIG. 3 shows a system diagram for the treatment of a pulp suspension 1 produced at least partly from printed waste paper.
  • the dissolution of the waste paper takes place in a pulper 14, wherein in addition to water and the replacement of printing inks supporting chemicals are added.
  • the pulp suspension 1 passes through several cleaning and Sorting stages 15, in which impurities are removed. Between these or as here thereafter, the pulp suspension 1 also passes through at least one deinking stage 16 in which the printing inks are removed. The ink removal is usually done by flotation.
  • a stock preparation plant usually has several successively arranged water circuits, also called loops.
  • the pulp suspension 1 passes through at least one cleaning stage 15 in the form of a flotation, a sorter, or the like.
  • the loops often also have drainage facilities, such as disc filters, screw press o, ä.
  • the discharge of long and flexible fibers to form a high quality pulp takes place in the form of long fiber fraction 1 1.
  • the highly consistent accepts of the stock preparation formed essentially of processed fibers and fillers are diluted with the white water collected in the paper machine, deaerated and fed to the headbox of the paper machine.
  • the pulp suspension 1 for pre-fractionation is passed through an additional fractionating device 17 of known design. This additional fractionating device 17 forms a short fiber fraction with predominantly short fibers and a long fiber fraction with predominantly long fibers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de fractionnement d'une suspension de matière fibreuse (1) obtenue à partir de vieux papiers ou de déchets d'une machine permettant d'obtenir des bandes de matière fibreuse multicouches ou monocouches, une fraction de fibres longues (11) présentant des fibres principalement longues et une fraction de fibres courtes (12) présentant des fibres principalement courtes étant formées. L'invention vise à améliorer l'efficacité du recyclage. A cet effet, l'indice Kappa de la fraction de fibres longues (11) est inférieur à celle de la suspension de matière fibreuse (1).
EP13752884.0A 2012-09-21 2013-08-15 Fractionnement Withdrawn EP2898143A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210216950 DE102012216950A1 (de) 2012-09-21 2012-09-21 Fraktionierung
PCT/EP2013/067063 WO2014044475A1 (fr) 2012-09-21 2013-08-15 Fractionnement

Publications (1)

Publication Number Publication Date
EP2898143A1 true EP2898143A1 (fr) 2015-07-29

Family

ID=49034083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13752884.0A Withdrawn EP2898143A1 (fr) 2012-09-21 2013-08-15 Fractionnement

Country Status (4)

Country Link
EP (1) EP2898143A1 (fr)
CN (1) CN104755672B (fr)
DE (1) DE102012216950A1 (fr)
WO (1) WO2014044475A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112411241B (zh) * 2020-10-26 2021-10-26 华南理工大学 一种纤维分级方法和分级式布浆装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427541A (en) * 1982-04-28 1984-01-24 Wisconsin Alumni Research Foundation Method and apparatus for spray fractionation of particles in liquid suspension
DE4029545A1 (de) 1990-09-18 1992-03-19 Escher Wyss Gmbh Stoffauflauf-einrichtung
DE4031038C2 (de) 1990-10-01 1997-01-23 Voith Sulzer Papiermasch Gmbh Vorrichtung zum Herstellen eines mehrlagigen Papiers oder Kartons
DE19960218A1 (de) * 1999-12-14 2001-06-28 Voith Paper Patent Gmbh Verfahren zum Fraktionieren einer Papierfasersuspension
DE10116368A1 (de) * 2001-04-02 2002-10-10 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von holzstoffhaltigem Altpapier
DE10244521B3 (de) * 2002-09-25 2004-02-19 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von Altpapier
EP1798329B1 (fr) * 2005-12-17 2010-05-19 Voith Patent GmbH Procédé pour enlever des contaminants d'une suspension aqueuse de fibres
DE102007029805A1 (de) * 2007-06-27 2009-01-02 Voith Patent Gmbh Verfahren zur Erzeugung von mehrlagigem Karton oder Verpackungspapier aus Altpapier
DE102008009134A1 (de) * 2008-02-14 2009-08-20 Voith Patent Gmbh Verfahren zur Entfernung von Störstoffen aus einer wässrigen Faserstoffsuspension

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014044475A1 *

Also Published As

Publication number Publication date
WO2014044475A1 (fr) 2014-03-27
DE102012216950A1 (de) 2014-03-27
CN104755672A (zh) 2015-07-01
CN104755672B (zh) 2017-03-08

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