EP1759059A1 - Procede et dispositif pour preparer une suspension de matiere fibreuse - Google Patents

Procede et dispositif pour preparer une suspension de matiere fibreuse

Info

Publication number
EP1759059A1
EP1759059A1 EP05751729A EP05751729A EP1759059A1 EP 1759059 A1 EP1759059 A1 EP 1759059A1 EP 05751729 A EP05751729 A EP 05751729A EP 05751729 A EP05751729 A EP 05751729A EP 1759059 A1 EP1759059 A1 EP 1759059A1
Authority
EP
European Patent Office
Prior art keywords
suspension
fibrous
paper
fiber
carbon dioxide
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Withdrawn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
EP05751729A
Other languages
German (de)
English (en)
Inventor
Klaus Doelle
Niggl Volker
Bernd Gueldenberg
Holger Humberg
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 EP1759059A1 publication Critical patent/EP1759059A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/20—Chemically or biochemically modified fibres
    • 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately

Definitions

  • the invention relates to SC paper which is produced using a fibrous suspension containing fibers partially loaded with ash.
  • this object is achieved in the case of newsprint of the type mentioned at the outset in that the ash content in the fibrous web of the newsprint produced from the fibrous suspension is higher than 15%, preferably higher than 19%.
  • this object is achieved in the case of wood-free paper of the type mentioned at the outset in that the ash content in the fibrous web of wood-free, uncoated paper produced from the fiber suspension is higher than 15%, preferably higher than 19%.
  • the invention allows the ash content in a paper to be maximized, which has economic and qualitative advantages. Ash is less expensive than fiber and at the same time advantageous in terms of the optical properties of whiteness and opacity.
  • this object is also achieved with the papers listed above by a process with the following process steps: introduction of calcium hydroxide in liquid or dry form or of cal ciumoxide in the fiber suspension,
  • the filler material used in other manufacturing processes is replaced by the filler material produced with the fiber loading process technology.
  • the field of application of the filler produced with the fiber loading process technology extends to paper production and to the fields of application of all types of paper, including packaging papers, which have a filler content between 1 and 60% or which have a white top layer with a filler content between 1 and 60% ,
  • the field of application of the invention is not restricted to the use of these fillers in paper-producing processes; the invention can be used in any paper making or auxiliary process including pulping. If a fiber suspension is treated with fiber loading technology in papermaking, a completely new product results which has new and improved properties compared to the products known on the market.
  • the process described below makes it possible to precipitate filler (calcium carbonate) directly during stock preparation in a paper mill, which is exclusively evenly distributed and deposited on and in the fibrous material, in particular the paper fiber.
  • a combination or a single application of the embodiments of the invention described below ensures that only fibrous material loaded with precipitated calcium carbonate is produced, the calcium carbonate being attached to or in the fibers;
  • the formation of free precipitated calcium carbonate (PCC) is prevented: by using an additional washing process before a grinding process and / or after the grinding process and / or before the crystallization process in a crystallizer and / or in front of the headbox or before the feed to the paper machine or by returning the press filtrate to a feed chest or other storage arrangement on the input side, it is achieved that a constant content of calcium hydroxide is set or regulated in the feed system of the fiber loading device.
  • the calcium hydroxide can be fed directly into a pulp dissolver.
  • the press filtrate can be returned to the pulping system. Calcium hydroxide that does not attach to or in the fibers is returned to the upstream processes.
  • the invention comprises a method according to which the fiber suspension is introduced into a press arrangement for pressing out a filtrate.
  • the filtrate is then at least partially returned to an arrangement for dissolving the pulp suspension, i.e. that is, in an input-side storage vessel, for example in a storage container.
  • the calcium hydroxide is at least partially added to the pulp dissolver assembly.
  • a pH between 7 and 12, especially between 9 and 12 is maintained.
  • aqueous fibrous pulp can be used as the starting material.
  • use material especially aqueous paper stock, from 0.1 to 20% consistency, preferably between 2 and 8%.
  • Calcium hydroxide in aqueous or in dry form or calcium oxide is mixed into the aqueous paper pulp in a range between 0.01 and 60% of the solid content present.
  • a static mixer, feed hopper or pulping system is used for the mixing process; a pH in the range between 7 and 12, preferably between 9 and 12, is used here.
  • the reactivity of the calcium hydroxide is between 0.01 seconds and 10 minutes, preferably between 1 second and 3 minutes.
  • Dilution water is mixed in according to the specified reaction parameters.
  • Carbon dioxide is mixed in according to the reaction parameters in a moist paper material dimension. Calcium carbonate precipitates in the carbon dioxide atmosphere.
  • the high mechanical strengths achieved by the high degree of grinding The end product has a positive effect on the production of all types of paper, because the process-related mechanical loads in the different sections of the paper machine, such as in the press section, the dryer section or in the area in which the paper web is rolled up, mean that the intermediate product and the product to be produced End product is subjected to high mechanical loads through the use of rewinding, winding, rewinding and converting machines.
  • the pretreatment of the fiber suspension according to the invention also creates the prerequisite for better drying, by means of which the efficiency in the production of all types of paper is increased. Residual moisture in the range between 1 and 20% is an advantage.
  • the invention also achieves higher degrees of whiteness and / or higher optical values with up to 15 brightness points better brightness in the production of all types of paper, cardboard or in various forms of use of cardboard, including the white top layer on a cardboard layer.
  • the energy input during the grinding process i.e. H. the amount of heat and the resulting heating is controlled. Crystals of various shapes can be produced according to the control.
  • the invention relates to a method in which a static mixer, a refiner, a disperger and / or a fluffer-FLPCC reactor is used as the reactor, the fiber content, in particular the paper content, in the case of a static mixer between 0.01 and 15%; is between 2 and 40% for a refiner and a disperser, in particular between 2 and 8% for an LC grinding and between 20 and 35% for an HC grinding, and between 15 and 60% for a Fluffer-FLPCC reactor ,
  • the invention also relates to a method according to which an energy expenditure of between 0.3 and 8 kWh / t, in particular between 0.5 and 4 kWh / t, is used for the precipitation reaction, in particular if no grinding process is used comes.
  • the process temperature is preferably between ⁇ 15 and 120 ° C., in particular between 20 and 90 ° C.
  • Rhombohedral, scalalenohedral and spherical crystals are preferably produced, the crystals having dimensions between 0.05 and 5 ⁇ m, in particular between 0.3 and 2.5 ⁇ m.
  • Static and / or movable, in particular rotating, mixing elements are used to produce a fibrous stock suspension loaded with calcium carbonate.
  • the process is preferably carried out in a pressure range between 0 and 15 bar, in particular between 0 and 6 bar.
  • the method is also advantageously carried out at a pH between 6 and 10, in particular between 6.5 and 9.0.
  • the reaction time here is between 0.01 seconds and 1 minute, in particular between 0.05 and 10 seconds.
  • Another advantage of using the technology according to the invention in the paper types listed above is that they can also be processed further in a calender. Due to the fact that when using fiber loading technology, fiber loading particles are deposited in, around and on the fibers, the blackening, i. H. Black satin, avoided.
  • the fibrous material produced with the fiber loading combination process technology according to the invention has a higher drainage capacity than conventionally produced fibrous material, which is in the range between 5 and 100 ml CSF or from 0.2 to 15 ° SR and is dependent on the required degree of grinding and filler content.
  • This pulp has a lower water retention of about 2 to 25%, depending on the raw material used for papermaking. Compared to conventional fiber, the water can be removed from the fiber suspension more quickly, and the fiber dries correspondingly faster. This also has a positive impact on the rewetting processing, which is therefore lower in the paper manufacturing process, and on the printability of the paper types produced.
  • the invention also relates to an apparatus for performing one of the methods described above.
  • the device is characterized in that it has a static mixer, a preparation device for introducing calcium oxide or calcium hydroxide, a press or dewatering screw, a compensating reactor or a leveling screw, a vessel serving as a crystallizer, a further static mixer, a carbon dioxide storage container or comprises an additional device for the recovery of carbon dioxide.
  • An embodiment is advantageous in which a high-consistency cleaner and / or a carbon dioxide heater and / or a storage container for press water or for water extracted in the dewatering screw are provided.
  • the filtrate of the fibrous suspension obtained in the dewatering screw is returned via a line to a feed tank or another upstream device for processing the fibrous suspension.
  • FIG. 1 shows a diagram of the preparation of a fiber suspension for use in a machine for producing a fiber web
  • FIG. 1 A pipeline system 1 (FIG. 1) is provided for a fiber suspension and is equipped with control valves 2, 3.
  • the control valve 2 is arranged in a line 4, via which the piping system 1 is connected to a static mixer 5.
  • Dilution water is fed into the mixer 5 via a valve 6.
  • a mixer 7 or a container for storing the fiber suspension is arranged downstream of the mixer 5 in the flow direction of the fiber suspension.
  • the pulp suspension is pumped from the chest 7 to a further static mixer 9 by a pump 8.
  • Dilution water is also supplied to the mixer 9 via a valve 10.
  • the inflow of a suspension of calcium hydroxide is controlled via a valve 11, which is attached in a line 12.
  • a preparation device 13 in which solid calcium oxide or calcium hydroxide is introduced into water.
  • the preparation device 13 is supplied with water via a line 14 with a valve 15.
  • the suspension generated in the preparation device 13 is introduced into the line 12 via a pump 16.
  • a pulp suspension mixed with calcium hydroxide thus flows from the mixer 9 into a line 17 with a valve 18 to a dewatering screw 19 in which water is withdrawn from the pulp suspension, which water is returned, for example via a line 20, to the mixer 5 as dilution water.
  • the water extracted in the dewatering screw 19 can also be passed to a storage container 21 for the fiber suspension, or it is returned to the mixer 9.
  • the pH value in the units upstream of the dewatering screw 19 can be increased and regulated by the reflux of water containing calcium hydroxide.
  • the fiber suspension passes through a line 22 to a leveling screw 23 in order to even out the fiber suspension.
  • This is a vessel 25 in the flow direction via a line 24 Subordinate (crystallizer).
  • This is connected to a carbon dioxide reservoir 30 via a line 29 equipped with valves 26, 27 and a pump 28 for supplying carbon dioxide. From this, carbon dioxide is introduced into the crystallizer 25 in order to produce the desired precipitation reaction of calcium hydroxide and carbon dioxide to form calcium carbonate as a filler in the fibers of the fibrous material.
  • the carbon dioxide storage container 30 is additionally connected to the leveling screw 23 via a further line 31 branching off from line 29 and equipped with a valve 32. As a result, carbon dioxide can also be introduced into this in order to at least partially carry out the precipitation reaction there.
  • Line 29 is also connected to a static mixer 34 via a further valve 33. This serves to add further carbon dioxide to the fibrous material suspension flowing out of the crystallizer 25 via a line 36 provided with a valve 35.
  • the fiber suspension flows out of the mixer 34 into a mixing container 37.
  • a storage container 38 can be arranged, which also serves as a filtration device.
  • calcium carbonate-enriched filtrate is returned to the storage tank 7 or to another upstream unit for the treatment of the dilution water or the fiber suspension.
  • the mixing container 37 is equipped with a rotor 39 for mixing the fiber suspension.
  • the fiber suspension either flows directly from the mixer 34 to a headbox of a paper machine or is subjected to a further mechanical treatment, for example in a refiner feed chest.
  • the mixer 34 can also be fed from the pipeline system 1 via the valve 3 and a line 40 in which it is attached, fiber suspension which has not yet been subjected to calcium hydroxide. It is further provided that from the machine for producing the fibrous web, in particular the paper machine, white water or process water, which has been recovered, for example, in the screen area of the paper machine, or, as already described above, fibrous suspension from the dewatering screw 19 is fed to the container 21 , Dilution water is supplied to this, for example, via a line 41 with a valve 42.
  • Dilution water mixed with process water flows from the container 21 via a line 43, a pump 44 and a valve 45 to the crystallizer 25.
  • a high-consistency refiner 46 is advantageously arranged within line 4.
  • a heater 47 for the carbon dioxide supplied from the storage container 30 is also optional. The heater 47 works with superheated steam, which is fed in via an inlet 48 and discharged again via an outlet 49.
  • the machine comprises a twin-wire former 50, a press section 51 with two press nips arranged one behind the other, a single-row dryer section 52, calender 53 with a plurality of soft and hard rolls, and a winding device 54.
  • a machine for the production of newsprint, which comprises a twin-wire former 55, a press section 56 with two press nips arranged one behind the other, a single-row dryer section 57 and two calenders 58, 59 each comprising a soft and a hard roller.
  • the paper web is wound up by a winding device 60.
  • a machine (FIG. 4) for producing WFU paper comprises a twin-wire former 61, a press section 62 with two press nips arranged one behind the other, a single-row dryer section 63, within which an application device 64 is arranged, a two-row dryer section 65, two, each a pair of calenders 66, 67 and a winding device 68.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un papier supercalandré (SC), fabriqué au moyen d'une suspension de matière fibreuse contenant des fibres partiellement chargées de cendres et caractérisé en ce que la teneur en cendres de la bande de papier SC, produite à partir de la suspension de matière fibreuse, est supérieure à 35 %, de préférence supérieure à 39 %. Cette invention concerne également un papier journal, fabriqué au moyen d'une suspension de matière fibreuses contenant des fibres partiellement chargées de cendres et caractérisé en ce que la teneur en cendres de la bande de papier journal, produite à partir de la suspension de matière fibreuse, est supérieure à 15 %, de préférence supérieure à 19 %. Ladite invention concerne en outre un papier non couché sans bois, fabriqué au moyen d'une suspension de matière fibreuse contenant des fibres partiellement chargées de cendres et caractérisé en ce que la teneur en cendres de la bande de papier non couché sans bois, produite à partir de la suspension de matière fibreuse, est supérieure à 15 %, de préférence supérieure à 19 %.
EP05751729A 2004-06-09 2005-06-01 Procede et dispositif pour preparer une suspension de matiere fibreuse Withdrawn EP1759059A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004028045A DE102004028045A1 (de) 2004-06-09 2004-06-09 Verfahren und Vorrichtung zur Aufbereitung einer Faserstoffsuspension
PCT/EP2005/005863 WO2005121448A1 (fr) 2004-06-09 2005-06-01 Procede et dispositif pour preparer une suspension de matiere fibreuse

Publications (1)

Publication Number Publication Date
EP1759059A1 true EP1759059A1 (fr) 2007-03-07

Family

ID=34980283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05751729A Withdrawn EP1759059A1 (fr) 2004-06-09 2005-06-01 Procede et dispositif pour preparer une suspension de matiere fibreuse

Country Status (7)

Country Link
US (1) US20070119561A1 (fr)
EP (1) EP1759059A1 (fr)
CN (1) CN1961117A (fr)
BR (1) BRPI0511518A (fr)
DE (1) DE102004028045A1 (fr)
RU (1) RU2006146682A (fr)
WO (1) WO2005121448A1 (fr)

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DE10302783A1 (de) * 2003-01-24 2004-08-12 Voith Paper Patent Gmbh Verfahren zur Erzeugung einer für die Herstellung einer Tissue- oder Hygienebahn bestimmten Faserstoffsuspension
DE10335751A1 (de) * 2003-08-05 2005-03-03 Voith Paper Patent Gmbh Verfahren zum Beladen einer Faserstoffsuspension und Anordnung zur Durchführung des Verfahrens
DE10357437A1 (de) * 2003-12-09 2005-07-07 Voith Paper Patent Gmbh Verfahren zum Beladen einer Faserstoffsuspension und Anordnung zur Durchführung des Verfahrens
US20060096525A1 (en) * 2004-11-08 2006-05-11 Sirkar Kamalesh K Solid hollow fiber cooling crystallization systems and methods
DE102006003647A1 (de) * 2005-07-14 2007-01-18 Voith Patent Gmbh Verfahren und Vorrichtung zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit Füllstoff
DE102007011796A1 (de) * 2007-03-12 2008-09-18 Voith Patent Gmbh Verfahren zur Aufbereitung von beladenen Fasern
DE102007051664A1 (de) * 2007-10-30 2009-05-07 Voith Patent Gmbh Verfahren zur Bildung von Calciumcarbonat in einer Faserstoffsuspension II
DE102007051665A1 (de) * 2007-10-30 2009-05-07 Voith Patent Gmbh Verfahren zur Bildung von Calciumcarbonat in einer Faserstoffsuspension
US8021517B2 (en) * 2008-02-28 2011-09-20 Honeywell Asca Inc. Use of fluorescent nanoparticles to make on-line measurements of cross-web and machine-direction component and property variations in paper and continuous web products
US7858953B2 (en) * 2008-05-23 2010-12-28 Honeywell Asca Inc. Use of fluorescent nanoparticles to measure individual layer thicknesses or composition in multi-layer films and to calibrate secondary measurement devices
FI124831B (fi) 2010-03-10 2015-02-13 Upm Kymmene Oyj Menetelmä ja reaktori kalsiumkarbonaatin in-line-valmistamiseksi paperimassavirtaukseen
FI125278B (fi) * 2010-08-20 2015-08-14 Upm Kymmene Corp Menetelmä kalsiumkarbonaatin saostamiseksi sekä menetelmän käyttö

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US2599091A (en) * 1946-04-23 1952-06-03 Vanderbilt Co R T Forming pigment in cellulose fiber and paper containing the pigmented fiber
US5096539A (en) * 1989-07-24 1992-03-17 The Board Of Regents Of The University Of Washington Cell wall loading of never-dried pulp fibers
US5718801A (en) * 1994-08-11 1998-02-17 Ppg Industries, Inc. Method for controlling froth and reducing stickies in the flotation process for deinking waste paper using a froth moderating agent
US5662773A (en) * 1995-01-19 1997-09-02 Eastman Chemical Company Process for preparation of cellulose acetate filters for use in paper making
DE10115421A1 (de) * 2001-03-29 2002-10-02 Voith Paper Patent Gmbh Verfahren und Aufbereitung von Faserstoff
US6413365B1 (en) * 2001-07-11 2002-07-02 Voith Paper Patent Gmbh Method of loading a fiber suspension with calcium carbonate
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern
EA006451B1 (ru) * 2002-02-02 2005-12-29 Фойт Пэйпер Патент Гмбх Способ обработки волокон, содержащихся в суспензии волокнистого материала
DE10208983A1 (de) * 2002-02-28 2003-09-11 Voith Paper Patent Gmbh Verfahren zur Herstellung einer Faserbahn

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Also Published As

Publication number Publication date
CN1961117A (zh) 2007-05-09
DE102004028045A1 (de) 2005-12-29
BRPI0511518A (pt) 2007-12-26
WO2005121448A1 (fr) 2005-12-22
US20070119561A1 (en) 2007-05-31
RU2006146682A (ru) 2008-07-10

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