WO2018210495A1 - Procédé de traitement d'un flux de suspension de fibres - Google Patents

Procédé de traitement d'un flux de suspension de fibres Download PDF

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Publication number
WO2018210495A1
WO2018210495A1 PCT/EP2018/059353 EP2018059353W WO2018210495A1 WO 2018210495 A1 WO2018210495 A1 WO 2018210495A1 EP 2018059353 W EP2018059353 W EP 2018059353W WO 2018210495 A1 WO2018210495 A1 WO 2018210495A1
Authority
WO
WIPO (PCT)
Prior art keywords
stream
fiber fraction
short fiber
stage
grinding
Prior art date
Application number
PCT/EP2018/059353
Other languages
German (de)
English (en)
Inventor
Linus FRIEDRICH
Alexander Wohlmuth
Thomas RÜHL
Falk Albrecht
Christoph Adams
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
Priority to EP18717595.5A priority Critical patent/EP3625390A1/fr
Priority to CN201880030294.9A priority patent/CN110603359A/zh
Publication of WO2018210495A1 publication Critical patent/WO2018210495A1/fr

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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
    • D21D99/00—Subject matter not provided for in other groups of this subclass
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the invention relates to a process for the treatment of a pulp suspension stream formed at least partly from recovered paper, in particular OCC, comprising at least one dissolution and a fractionation stage to form a long fiber fraction stream and a first short fiber fraction stream, wherein the long fiber fraction stream is passed into a first milling stage and ground.
  • the invention also relates to a device for carrying out the method.
  • pulp suspensions used to make a fibrous web contain not only the actual paper fibers but also a more or less large amount of fine solids.
  • fine solids may be mineral fillers, called fillers for short, such as kaolins, carbonates, etc., which are generally needed for paper production. They are also mostly called ashes, as the mineral fillers are incombustible. However, they may also be fiber fragments which are e.g. arise during the grinding of fibers. These are also called fines.
  • the dissolution stage the dissolution of the fibers and the waste paper takes place. This is followed by several process steps for the treatment of the pulp suspension until the pulp suspension meets the required property parameters and to a machine for producing a Fiber web can be handed over.
  • these property parameters should be constant over time in order to achieve properties of the fibrous web produced in the paper machine which are as constant as possible over time, in particular their mechanical properties, in particular their strength parameters.
  • the object is solved by features of claim 1. It is a method for treating a pulp suspension stream formed at least partially from waste paper, in particular OCC, at least comprising a resolution and a fractionation stage for forming a long fiber fraction stream and a first short fiber fraction stream, wherein the long fiber fraction stream is passed into a first milling stage and ground. It is essential to the invention that the first short fiber fraction stream, preferably directly, is passed into a separation stage to form a first particulate filler stream and a second short fiber fraction stream, and at least a portion of the first particulate filler stream enters a milling stage and / or at least a portion of the second short fiber fraction stream the grinding step and / or in a further grinding step is performed and ground.
  • suspension streams are produced with improved strength potential.
  • This has a dampening effect in the subsequent paper machine on the negative effects of fluctuations in the composition of the raw material, in particular the fluctuations in the proportion of mineral fillers from.
  • the strengths of the fibrous web produced from the suspension streams are increased.
  • This effect can be used, for example, to produce packaging papers and board, for example liners, with increased strength values and thus a packaging paper or board, for example liners, which is superior to the "CEPI Container Board List.”
  • This has a direct positive economic impact for the paper manufacturer It is also possible for the papermaker to produce equivalent wrapping paper or equivalent but lower basis weight paperboard, thereby reducing manufacturing costs.
  • the method according to the invention can also be advantageously used in the production of kraftliner, high-performance liners, corrugated medium and flouting. Again, the mechanical properties of the fibrous webs are improved.
  • the grinding of the second short fiber fraction stream is preferably carried out combatfibrillierend, so that a sufficiently high number of fibrils to achieve the required strength of the fibrous web produced therefrom arises.
  • HC refiner and so-called dispersers, cone refiners and double disc refiners which are equipped with known, suitable for the fibrillating refining knurls. These can be, for example, basalt sets.
  • cone refiners For the first milling stage for the milling of the long fiber fraction stream, cone refiners, double-disc refiner and high-consistency refiner are suitable.
  • the long fiber fraction stream can be used directly after milling for papermaking.
  • the separation step for forming a first particulate filler stream and a second short fiber fraction stream from the first short fiber fraction stream may comprise a washing step.
  • Suitable scrubbers are known oblique screens, curved screens, drum thickeners, deashing devices (for example the Voith product VarioSplit), screw presses, flotation devices, etc.
  • deashing devices for example the Voith product VarioSplit
  • screw presses for example the Voith product VarioSplit
  • flotation devices for example the Voith product VarioSplit
  • cone refiners, double-disc refiners and high-consistency refiner (HC refiner) are suitable.
  • the second short fiber fraction stream is passed to a separation stage to form a short fiber fraction stream and a short fiber fraction fraction stream and the short fiber fraction fraction is ground in the milling stage and / or in the further milling stage.
  • the separation stage can be designed as a fractionation stage.
  • a classifier such as, for example, Applicant's "Fiber Splitter” product may be used to adjust the proportion of the second short fiber fraction stream to be ground, and the short fiber fraction stream may be fed directly to the paper machine.
  • the proportion of the second short fiber fraction stream to be ground with the aim of minimizing the effects of fluctuations in the composition of the raw material for producing the pulp suspension stream may also be controlled or regulated
  • the short-fiber fraction fraction is ground high-fibrillating in the milling stage or the further milling stage.
  • HC refiner and so-called dispersers, cone refiners and double disc refiners which are equipped with known, suitable for the fibrillating refining knurls. These can be, for example, basalt sets.
  • the entire first particulate matter stream is passed to the milling stage and ground together with the short fiber fraction fraction to form a particulate filler stream. By the common grinding of the first fines filler stream with the short fiber fraction fraction the fibrillating grinding is supported, so that the strength potential of the short fiber fraction fraction is increased and thus the mechanical properties of the fibrous web produced therefrom is improved.
  • first particulate filler stream may be passed to a further separation stage to form a first particulate filler sub-stream and a second particulate filler sub-stream and the second particulate filler sub-stream may be ground in the milling stage along with the short fiber fraction fraction.
  • the further separation stage may be embodied as a separator such as a hydrocyclone or classifier for separating the first particulate filler stream into two partial streams having different density of the particles, wherein preferably the second particulate filler partial stream has the higher average density of the particles. This also positively influences the grinding and makes it more efficient. However, it is also conceivable to carry out the further separation stage as a flow divider, wherein both partial streams have approximately the same composition.
  • the first fine material filler partial stream is subsequently fed again, that is to say after common grinding, to the short-fiber fraction fractionated fraction and to the second fine-substance filler partial stream, with the formation of a fine material filler stream.
  • the fine material filler stream can be fed directly to the paper machine.
  • At least a portion, preferably the entire first fine material filler stream is fed to the milling stage and ground and the short fiber fraction fraction ground in a further milling stage is fed to the milled first particulate filler stream after the milling stage to form a fines filler stream.
  • the second short fiber fraction stream is not ground and forms the short fiber fraction stream which can be fed directly to the paper machine.
  • the milled first fines filler stream forms the fines filler stream.
  • the first fines filler stream is not ground and forms the fines filler stream.
  • the milled second short fiber fraction stream forms the short fiber fraction stream. It is also possible that the first short fiber fraction stream is fed into a milling stage and ground. Since the short fiber fraction stream also contains fillers and fines, this variant also has a positive effect on the milling result in terms of increasing the strength potential of the pulp suspension and minimizing the effects of fluctuations in the composition of the raw material for the production of pulp suspension stream.
  • the virgin fibers and / or fillers may differ from the virgin fibers and / or fillers contained in the pulp suspension stream.
  • the fraction streams long fiber fraction stream, short fiber fraction stream, and fines flow stream are formed to feed a paper machine.
  • fillers in the long fiber fraction stream or short fiber fraction stream or fines filler stream additional adjuvants from the following group to be added: fillers, highly fibrillated fibers, in particular highly-fibrillated short fibers, strength-increasing additives, retention aids, virgin fibers.
  • the long fiber fraction stream and the short fiber fraction stream and the fines filler stream are mixed and fed to a headbox of a paper machine.
  • the long fiber fraction stream and the short fiber fraction stream are mixed and fed into the outer layers of a multi-layer headbox of a paper machine and fed the fines Fül Istoffstrom in the arranged between the outer layers middle layer of the multi-layer headbox.
  • the object is also achieved by a device according to claim 16 for carrying out the method according to claim 1.
  • Figure 1 shows a first embodiment of the inventive method in
  • FIG. 2 shows a second embodiment of the method according to the invention in FIG
  • FIG. 3 shows a third embodiment of the method according to the invention in FIG.
  • Figure 4 shows a fourth embodiment of the method according to the invention in a schematic representation
  • Figure 5 shows a fifth embodiment of the inventive method in
  • FIG. 6 shows a variant of the method according to the invention in terms of
  • the method is used, for example, to produce a testliner, a carton, a kraftliner, a high-performance liner, a corrugated medium or a flooding in a paper machine.
  • the raw material 1 which comprises at least partially recovered paper, in particular OCC, is first processed in one or more treatment stages 5 to form a pulp suspension stream by known processes.
  • the raw material 1 is dissolved in a dissolution stage and then coarsely and finely purified by conventional methods by means of one or more purification stages.
  • the pulp suspension is buffered in laid paper for buffering fluctuating volume flows.
  • the pulp suspension is introduced into a fractionation stage 13 Forming a long fiber fraction stream 2 and a first short fiber fraction stream 3.1 out.
  • the long fiber fraction stream 2 has a high content of long fibers with few fillers and fines, in the short fiber fraction stream 3.1 the proportion of short fibers and fillers and fines is high.
  • the long fiber fraction stream 2 can therefore be fed and ground after one or more treatment stages 6 of a first milling stage 15.2.
  • the milling stage may comprise a cone refiner or a double disc refiner or a high consistency refiner or a disperser.
  • the finished long fiber fraction stream 2 is fed to a paper machine 9 for producing, for example, a testliner.
  • the short fiber fraction stream 3.1 is led to further treatment of a separation stage 14 to form a first particulate filler stream 4.1 and a second short fiber fraction stream 3.2.
  • the separation stage 14 comprises a washing step. Suitable scrubbers are known oblique screens, curved screens, drum thickeners, deashing devices (for example the Voith product VarioSplit), screw presses, flotation devices, etc.
  • the fine material filler stream 4.1 contains a high proportion of fillers and fines, as well as only a small amount of short fibers. This is then thickened in the treatment stage 8 and driven over a buffer chest.
  • the second short fiber fraction stream 3.2 is thickened in the treatment stage 7 and drained and dispersed and also passed through a chest to buffer fluctuations in the volume flow.
  • the long fiber fraction stream 2 consequently has, after the fractionation stage 13, a filler content of less than 70% and a freeness of less than 65% and an average fiber length of more than 120% of the corresponding values of the pulp suspension prior to the fractionation stage 13.
  • the characteristic values of the other currents can be taken from the table.
  • the treatment stages 6, 7, 8 are optional and the process steps carried out therein are adapted to the requirements of the method according to the invention.
  • a separation stage 13.3 is provided for forming a short-fiber fractional fractional stream 3.3 and for forming a short-fiber fractional stream 3.
  • the separation stage 13.3 may be fractionating or merely designed as a flow divider.
  • two fractions are produced with different proportions of short short fibers and long short fibers.
  • the short fiber fraction stream 3 carries the larger proportion of long short fibers and the short fiber fraction fraction 3.3 the larger proportion of short short fibers.
  • the separation stage 13.3 it is also possible to operate the separation stage 13.3 so that the short fiber fraction stream 3 leads the larger proportion of short short fibers and the short fiber fraction fraction 3.3 the larger proportion of long short fibers. If the separation stage 13.3 is designed as a current divider, the composition of the short-fiber fraction stream 3 and the short-fiber fractional fractional stream 3.3 is the same as separation stage 13.3
  • the proportion of the second short fiber fraction stream to be milled may also be controlled or controlled with known control and annealing means in order to minimize the effects of fluctuations in the composition of the raw material for the production of the pulp suspension stream.
  • a grinding stage 15.4 is provided in which both the first fine material filler stream 4.1 after the treatment stage 8 and the short fiber fraction fraction 3.3 is supplied.
  • suitable milling stages with conical refiner, double disc refiner or Dickstoffrefiner (HC refiner).
  • HC refiner Dickstoffrefiner
  • the second embodiment shown in FIG. 2 differs from the first embodiment in that the first fine-material filler stream 4.1 before the grinding stage 15.4 is led to a further separation stage 13.4 for forming a first fine-material filler partial stream 4.2 and a second fine-material filler partial stream 4.3.
  • the second fine material filler sub-stream 4.3 is ground in the grinding stage 15.4 together with the short-fiber fraction fraction 3.3.
  • the further separation stage may be embodied as a separator such as a hydrocyclone or classifier for separating the first particulate filler stream 4.1 into two partial streams having different densities of the particles, wherein preferably the second particulate filler partial stream 4.3 has the higher average density of the particles.
  • the second fine-material filler sub-stream 4.3 has a higher proportion of fillers. This also positively influences the grinding and makes it more efficient. However, it is also conceivable to carry out the further separation stage 13.4 as a flow divider, wherein both partial flows have approximately the same composition. After the common refining of the short-fiber fraction fraction 3.3 and of the second fine-material filler fraction 4.3, the first fine-material filler fraction 4.2 is fed back to form a fine-material filler stream 4. The fine material filler stream 4 can be fed directly to the paper machine.
  • the third embodiment shown in FIG. 3 differs from the first embodiment in that the short fiber fraction sub-stream 3.3 is not ground together with the first fine-material filler stream 4.1 but is separately ground in a further grinding stage 15.3 and then ground to the first fine-material filler stream 4.1 is supplied to form the fines filler stream 4.
  • Grind stage 15.3 is suitable for taper refiner, double-disc refiner and high-consistency refiner (HC refiner).
  • the entire first fine material filler stream 4.1 is ground after the treatment stage 8 in a milling stage 15.4 and subsequently fed as a fine material filler stream 4 to a paper machine 9 for producing a fibrous web.
  • the second short fiber fraction stream 3.2 is fed as a short fiber fraction stream 3 to a paper machine 9 for producing a fibrous web.
  • suitable cone refiner, double disc refiner and high-consistency refiner HC refiner.
  • the entire second short fiber fraction stream 3.2 after the treatment stage 7 is ground in a further grinding stage 15.3 and subsequently fed as short fiber fraction stream 3 to a paper machine 9 for producing a fibrous web.
  • the first fine material filler stream 4.1 is fed unground as a fine material filler stream 4 to a paper machine 9 for producing a fibrous web.
  • the grinding of the second short fiber fraction stream 3.2 is preferably carried out highly fibrillating, so that a sufficiently high number of fibrils to achieve the required strength of the fibrous web produced therefrom.
  • HC refiner and so-called dispersers, cone refiners and double disc refiners which are equipped with known, suitable for the fibrillating refining knurls. These can be, for example, basalt sets.
  • fresh fibers and / or fillers can be added to positively influence the grinding result of the first grinding stage 15.2 and / or the further grinding stage 15.3 and / or the grinding stage 15.4.
  • the fresh fibers and / or fillers may differ from those in the Fibrous suspension stream contained F fibers and / or fillers. It is also possible to add to the respective long fiber fraction stream or short fiber fraction stream or fines filler stream additional adjuvants from the following group: fillers, highly fibrillated fibers, especially highly fibrillated short fibers, strength increasing additives, retention agents, virgin fibers.
  • FIG. 6 shows a schematic representation of a variant of the method according to the invention with regard to the feeding of a paper machine 9.
  • the long-fiber fraction stream 2 and the short-fiber fraction stream 3 and the fine-material filler stream 4 are mixed in a chest 12 and fed to a headbox 11 of a paper machine.
  • the mixed pulp suspension is fed via the headbox 1 1 to a former 10 for forming a fibrous web, for example a liner web.
  • FIG. 7 shows a further variant of the method according to the invention with regard to the feeding of a paper machine 9 in a schematic representation.
  • the long fiber fraction stream 2 and the short fiber fraction stream 3 are mixed in a vat 12 and fed separately from the fines filler stream 4 to a headbox 11.
  • This is designed as a multi-layer casserole 1 1 with two outer layers and an intermediate middle layer.
  • the short fiber fraction stream 3 mixed with the long fiber fraction stream 2 is fed to the outer layers and the fines filler stream 4 is fed to the middle layer via a chest 12.
  • a strength-increasing additive for example starch, can be added to the fines filler stream 4. The addition can be done before or after the chest 12 or in the chest or within the headbox 1 1 in the middle layer.
  • LIST OF REFERENCE NUMBERS for example starch

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Abstract

L'invention concerne un procédé de traitement d'un flux de suspension de fibres au moins partiellement formé de vieux papier, notamment de papier OCC, comprenant au moins une dissolution ainsi qu'un étage de fractionnement (13) destinée à former un flux de fraction de fibres longues (2) et un premier flux de fraction de fibres courtes (3.1). Le flux de fraction de fibres longues (2) est acheminé à un premier étage de trituration (15.2) et il est trituré. Le procédé selon l'invention est caractérisé en ce que le premier flux de fraction de fibres courtes (3.1) est acheminé, de préférence directement, dans un étage de séparation (14) en vue de former un premier flux de matière fine - matière de remplissage (4.1) et un deuxième flux de fraction de fibres courtes (3.2) et en ce qu'au moins une partie du premier flux de matière fine - matière de remplissage (4.1) est acheminée dans un étage de trituration (15.4) puis est triturée et/ou au moins une partie du deuxième flux de fraction de fibres courtes (3.2) est acheminée dans l'étage de trituration (15.4) et/ou dans un autre étage de trituration (15.3) puis est triturée.
PCT/EP2018/059353 2017-05-18 2018-04-12 Procédé de traitement d'un flux de suspension de fibres WO2018210495A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18717595.5A EP3625390A1 (fr) 2017-05-18 2018-04-12 Procédé de traitement d'un flux de suspension de fibres
CN201880030294.9A CN110603359A (zh) 2017-05-18 2018-04-12 用于处理纤维悬浮液流的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017110815.7 2017-05-18
DE102017110815.7A DE102017110815A1 (de) 2017-05-18 2017-05-18 Verfahren zur Behandlung eines Fasersuspensionsstromes

Publications (1)

Publication Number Publication Date
WO2018210495A1 true WO2018210495A1 (fr) 2018-11-22

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Application Number Title Priority Date Filing Date
PCT/EP2018/059353 WO2018210495A1 (fr) 2017-05-18 2018-04-12 Procédé de traitement d'un flux de suspension de fibres

Country Status (4)

Country Link
EP (1) EP3625390A1 (fr)
CN (1) CN110603359A (fr)
DE (1) DE102017110815A1 (fr)
WO (1) WO2018210495A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022129052A1 (fr) * 2020-12-15 2022-06-23 Papierholz Austria Gmbh Procédé de séparation de matières fines cellulosiques contenues dans des suspensions fibreuses et/ou des filtrats

Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2009077001A1 (fr) * 2007-12-17 2009-06-25 Sca Hygiene Products Gmbh Procédé de préparation de pâte, et de traitement de pâte, et papier, en particulier un papier de soie
DE102008053858A1 (de) * 2008-10-30 2010-05-06 Voith Patent Gmbh Algen-Faserstoff
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
DE102015201996A1 (de) * 2015-02-05 2016-08-11 Voith Patent Gmbh Faserstoffbehandlung

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Publication number Priority date Publication date Assignee Title
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
FI20055635A (sv) * 2005-12-01 2007-06-02 Metso Paper Inc Förfarande för framställning av papper
DE102008010447A1 (de) * 2008-02-21 2009-08-27 Voith Patent Gmbh Verfahren zur Behandlung und Verwendung einer Faserstoffsuspension
CN105088845B (zh) * 2014-05-09 2017-05-31 安德里茨（中国）有限公司 用于对废纸进行材料处理的方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009077001A1 (fr) * 2007-12-17 2009-06-25 Sca Hygiene Products Gmbh Procédé de préparation de pâte, et de traitement de pâte, et papier, en particulier un papier de soie
DE102008053858A1 (de) * 2008-10-30 2010-05-06 Voith Patent Gmbh Algen-Faserstoff
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
DE102015201996A1 (de) * 2015-02-05 2016-08-11 Voith Patent Gmbh Faserstoffbehandlung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022129052A1 (fr) * 2020-12-15 2022-06-23 Papierholz Austria Gmbh Procédé de séparation de matières fines cellulosiques contenues dans des suspensions fibreuses et/ou des filtrats

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DE102017110815A1 (de) 2018-11-22
EP3625390A1 (fr) 2020-03-25
CN110603359A (zh) 2019-12-20

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