EP1682722A1 - Procede pour charger une suspension fibreuse et systeme pour mettre ledit procede en oeuvre - Google Patents

Procede pour charger une suspension fibreuse et systeme pour mettre ledit procede en oeuvre

Info

Publication number
EP1682722A1
EP1682722A1 EP04787229A EP04787229A EP1682722A1 EP 1682722 A1 EP1682722 A1 EP 1682722A1 EP 04787229 A EP04787229 A EP 04787229A EP 04787229 A EP04787229 A EP 04787229A EP 1682722 A1 EP1682722 A1 EP 1682722A1
Authority
EP
European Patent Office
Prior art keywords
suspension
fiber
fiber suspension
carbon dioxide
calcium hydroxide
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Withdrawn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
EP04787229A
Other languages
German (de)
English (en)
Inventor
Lothar Pfalzer
Klaus Dölle
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 EP1682722A1 publication Critical patent/EP1682722A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates

Definitions

  • the invention relates to a method for loading a fibrous suspension containing cellulose fibers with calcium carbonate.
  • this object is achieved by a method with the following method steps:
  • GCC Ground Calcium Carbonate
  • 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 that have a filler content between 1 and 60% or that 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 after the grinding process and / or during the grinding process and / or after the crystallization process in a crystallizer and / or in front of the headbox or before being fed to the paper machine or by returning the press filtrate to a storage tank or other storage arrangement on the input side, it is achieved that a constant content of calcium hydroxide in the feed system of the fiber loading device is set or regulated.
  • the calcium hydroxide can be fed directly into a pulp dissolver.
  • the press filtrate can be returned to the pulping system.
  • Calcium hydroxide that is not converted into calcium carbonate or that does not attach to or in the fibers is returned to the upstream processes. Only the filler that is not deposited on or in the fibers, ie free precipitated calcium carbonate, is washed out.
  • the fibers themselves, which are filled with filler on the inside and outside, do not lose it due to the washing process and the return of the press filtrate, so that the positive effects of fiber loading technology remain.
  • 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, in particular between 8 and 12 is maintained.
  • aqueous fibrous material in particular aqueous paper stock, of 0.1 to 20% consistency, preferably between 2 and 8%, can be used as the starting material.
  • 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 and 180 seconds, preferably between 0.05 and 60 seconds. According to the given Reaction parameters are mixed in dilution water to produce an aqueous starting material.
  • Carbon dioxide is mixed in according to the reaction parameters in a moist paper stock suspension. Calcium carbonate precipitates in the carbon dioxide atmosphere.
  • the high mechanical strength of the end product achieved through the high degree of grinding has a positive effect on the production of all types of paper, in particular FL-cigarette papers, FL-B&P papers, FL-sack kraft papers and FL-filter papers, because of process-related mechanical loads in the Various 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, the intermediate product and the end product to be produced are subjected to high mechanical loads through the use of rewinding, winding, rewinding and converting machines becomes. Particularly in the manufacture of cigarette paper, high mechanical loads are created on the cigarette paper used. These are caused, among other things, by the use of winding machines in the manufacture of cigarettes and by the low basis weight.
  • 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 a brightness which is up to 15 brightness points better 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 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.
  • the process temperature is preferably between -15 and 120 ° C., in particular between 20 and 90 ° C.
  • Rhombohedral, scalohedral are preferred and produces spherical crystals, 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 process is also advantageously carried out at a pH between 6 and 10, in particular between 6.5 and 9.5.
  • the response time here is between 0.01 and 180 seconds, in particular between 0.05 and 60 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 fiber material produced with the fiber loading combination process technology according to the invention has a higher drainage capacity than conventionally produced fiber 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, which is less in the paper manufacturing process, and on the printability of the paper types produced.
  • the invention also relates to a device for performing one of the above described method.
  • filtrate of the fibrous suspension obtained in the dewatering screw can be returned via a line to a storage tank or another upstream device for processing the fibrous suspension.
  • An additional static mixer is advantageously used in front of a crystallizer, in which the fiber suspension is washed.
  • an additional washing device for cleaning the fiber suspension is arranged after the crystallizer.
  • an additional static mixer is present in front of the crystallizer, into which the fiber suspension is mixed with a filtrate and / or a calcium hydroxide suspension.
  • FIG. 1 shows a first diagram of the preparation of a fiber suspension for use in a machine for producing a fibrous web
  • FIG. 2 shows a second diagram.
  • a pipe system 1 (FIG. 1) is provided for a fiber suspension, which 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 and / or preferably filtrate crosslinked with calcium hydroxide 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. From the chest 7 the pulp suspension is pumped to a further static mixer 9 via 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.
  • a vessel 25 (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.
  • 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 the 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 fibrous suspension flows out of the mixer 34 into a mixing container 37.
  • a filtration device 38 can be arranged between the mixer 34 and the mixing container 37. From the filtration device 38, 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.
  • a fiber suspension is transported in a device 48 (FIG. 2) in a pipeline system equipped with control valves 49, 50 for loading with calcium carbonate.
  • the control valve 49 is arranged in a line 51, via which the piping system is connected to a static mixer 52. This can be fed through a valve 53 dilution water.
  • the inflow of a suspension of calcium hydroxide is controlled via a further valve 55 installed in a line 54.
  • This is made available by a preparation device 56 in which solid calcium oxide or calcium hydroxide is introduced into water.
  • the preparation device 56 is supplied with water via a line with a valve 57.
  • the suspension generated in the preparation device 56 is introduced into the line 55 via a pump 58.
  • Calcium hydroxide mixed and diluted fiber suspension thus flows out of the mixer 52 into a line 59 with a valve 60.
  • the line 59 feeds the suspension directly to a vessel 61 (crystallizer).
  • This is connected via a line 65 equipped with valves 62, 63 and with a pump 64 for supplying carbon dioxide to a carbon dioxide storage container 66.
  • carbon dioxide is introduced into the crystallizer 61 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 calcium hydroxide can also be mixed in from a feed tank.
  • the line 65 is connected via a further valve 67 to a static mixer 68, which serves to add further carbon dioxide to the fibrous stock suspension flowing out of the crystallizer 61 via a line 69 provided with a valve 69.
  • the pulp suspension flows out of the mixer 68 into a mixing container 71 (blend chest) which is equipped with a rotor 72 for mixing the pulp suspension.
  • the fiber suspension either flows directly from the mixing container 71 to a headbox of a paper machine or is subjected to a further mechanical treatment, for example in a refiner feed chest.
  • the mixing container 71 can additionally be supplied via the valve 50 and a line 73 with fiber suspension which is not loaded with calcium hydroxide.
  • a refiner 74 can be introduced into the piping system to refine the fiber suspension by means of an additional grinding process. This is fed to a pulp suspension via a line 75 branching off line 59. From the refiner 74, the pulp suspension, which has been ground again, passes via a line 76 into the line 70 and from there, as described above, into the storage container.
  • the refiner 74 is supplied with carbon dioxide from the carbon dioxide storage container 66 via a line 77 branching off the line 65 and a static mixer 78 connecting it to the line 75.
  • the vessel 74 additionally takes over the grinding process, so that a simple construction of the system for processing the fiber is created.
  • the grinding process also serves as a stirring process in order to store the calcium carbonate in the fibers by means of a shearing process.
  • a filtration device 79 similar to the filtration device 38 can also be present between the mixer 68 and the mixing container 71, from which the filtrate enriched with calcium carbonate is returned to a storage tank or to another upstream unit for processing the dilution water or the fiber suspension.
  • valve 63 valve 64 pump 65 line 66 carbon dioxide storage container 67 valve 68 mixer 69 valve 70 line 71 mixing container

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

L'invention concerne un procédé permettant de charger une suspension fibreuse contenant des fibres de cellulose, avec du carbonate de calcium, qui présente les étapes suivantes : introduire de l'hydroxyde de calcium sous forme liquide ou sèche ou de l'oxyde de calcium dans la suspension fibreuse ; introduire du dioxyde de carbone sous forme gazeuse dans la suspension fibreuse ; précipiter le carbone de calcium par le dioxyde de carbone ; triturer la suspension fibreuse pendant le processus de charge et laver ladite suspension fibreuse après le processus de cristallisation et/ou avant le processus de broyage et/ou pendant le processus de broyage et/ou après le processus de broyage.
EP04787229A 2003-10-31 2004-09-28 Procede pour charger une suspension fibreuse et systeme pour mettre ledit procede en oeuvre Withdrawn EP1682722A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10351292A DE10351292A1 (de) 2003-10-31 2003-10-31 Verfahren zum Beladen einer Faserstoffsuspension und Anordnung zur Durchführung des Verfahrens
PCT/EP2004/052331 WO2005042841A1 (fr) 2003-10-31 2004-09-28 Procede pour charger une suspension fibreuse et systeme pour mettre ledit procede en oeuvre

Publications (1)

Publication Number Publication Date
EP1682722A1 true EP1682722A1 (fr) 2006-07-26

Family

ID=34530079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04787229A Withdrawn EP1682722A1 (fr) 2003-10-31 2004-09-28 Procede pour charger une suspension fibreuse et systeme pour mettre ledit procede en oeuvre

Country Status (6)

Country Link
US (1) US20070068640A1 (fr)
EP (1) EP1682722A1 (fr)
CN (1) CN1867732A (fr)
BR (1) BRPI0416090A (fr)
DE (1) DE10351292A1 (fr)
WO (1) WO2005042841A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP1904681A2 (fr) * 2005-07-12 2008-04-02 Voith Patent GmbH Procede pour charger des fibres contenues dans une suspension de matieres fibreuses
US8728274B2 (en) * 2006-09-22 2014-05-20 Akzo Nobel N.V. Treatment of pulp
FI123392B (fi) * 2008-02-22 2013-03-28 Upm Kymmene Oyj Menetelmä kalsiumkarbonaatin saostamiseksi kuiturainaprosessin yhteydessä ja kuiturainakoneen lähestymisjärjestelmä
US20100106971A1 (en) * 2008-10-27 2010-04-29 Domagoj Premec Method and communication system for protecting an authentication connection
FI125278B (fi) * 2010-08-20 2015-08-14 Upm Kymmene Corp Menetelmä kalsiumkarbonaatin saostamiseksi sekä menetelmän käyttö
US20130168893A1 (en) * 2011-12-29 2013-07-04 Hollingsworth & Vose Company Charging of filter media
DE102012104773A1 (de) * 2012-06-01 2013-12-05 Delfortgroup Ag Zigarettenpapier mit plättchenförmigem Füllstoff
DE102020108071A1 (de) * 2020-03-24 2021-09-30 Delfortgroup Ag Umhüllungspapier für Rauchartikel mit verbessertem Aschebild

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223090A (en) * 1991-03-06 1993-06-29 The United States Of America As Represented By The Secretary Of Agriculture Method for fiber loading a chemical compound
DE10107448A1 (de) * 2001-02-16 2002-08-22 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit einem Füllstoff
DE10113998A1 (de) * 2001-03-22 2002-09-26 Voith Paper Patent Gmbh Verfahren zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit einem Hilfsstoff
US6413365B1 (en) * 2001-07-11 2002-07-02 Voith Paper Patent Gmbh Method of loading a fiber suspension with calcium carbonate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005042841A1 *

Also Published As

Publication number Publication date
WO2005042841A1 (fr) 2005-05-12
CN1867732A (zh) 2006-11-22
BRPI0416090A (pt) 2007-01-02
US20070068640A1 (en) 2007-03-29
DE10351292A1 (de) 2006-02-02

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