US20080023161A1 - Method and apparatus for loading fibers or cellulose which are contained in a suspension with a filler - Google Patents

Method and apparatus for loading fibers or cellulose which are contained in a suspension with a filler Download PDF

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Publication number
US20080023161A1
US20080023161A1 US11/748,814 US74881407A US2008023161A1 US 20080023161 A1 US20080023161 A1 US 20080023161A1 US 74881407 A US74881407 A US 74881407A US 2008023161 A1 US2008023161 A1 US 2008023161A1
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United States
Prior art keywords
suspension
accordance
carbon dioxide
cellulose
lime
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.)
Abandoned
Application number
US11/748,814
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English (en)
Inventor
Reinhard Gather
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
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Voith Patent GmbH
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Filing date
Publication date
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Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GATHER, REINHARD
Publication of US20080023161A1 publication Critical patent/US20080023161A1/en
Abandoned legal-status Critical Current

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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
    • 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 as well as to an apparatus for loading of fibers or cellulose contained in a suspension with a filler by way of a chemical precipitation reaction, wherein the fibers or cellulose are provided in the form of a suspension having a predetermined solids concentration.
  • PCC precipitated calcium carbonate
  • GCC disintegrated or ground calcium carbonate
  • PCC or GCC fillers are bulk materials which are produced in special manufacturing facilities which may be satellite plants of a paper or cardboard plant.
  • An on-line production of PCC however has never been considered, or is never considered in the paper or cardboard industry because of the special process characteristics which are associated with the production of PCC. Instead, PCC or GCC are transported as bulk material or in the form of a suspension to the paper or cardboard plants.
  • Loading of fibers or cellulose contained in a suspension with an additive may for example occur through a chemical precipitation reaction, in other words especially through a so-called “Fiber LoadingTM” process as described in the U.S. patent document U.S. Pat. No. 5,223,090 A.
  • a chemical precipitation reaction in other words especially through a so-called “Fiber LoadingTM” process as described in the U.S. patent document U.S. Pat. No. 5,223,090 A.
  • at least one additive, especially a filler is deposited onto the moistened fiber surfaces of the fibrous material.
  • the fibers may for example be loaded with calcium carbonate.
  • calcium oxide and/or calcium hydroxide is added to the moist, disintegrated fibrous material in such a way that at least a portion associates itself with the water which is contained in the fibrous material.
  • the thus treated fibrous material is subsequently supplied, preferably in a shear field with carbon dioxide.
  • a method which is based on and at the same time improves upon the method described in the aforementioned U.S. patent specification for loading of fibers contained in a suspension is known, for example from the German disclosure document DE 102 04 254 A1.
  • the fibers which are loaded with a precipitant are ground in order to produce precipitant product particles having maximum dimensions in the range of approximately 0.05 to approximately 5 ⁇ m, wherein the creation of the crystalline precipitant product particles occurs in an online process in the stock preparation line.
  • a method for the production of cellulose for subsequent use in the production of a fibrous web, especially a paper or cardboard web is known from the German disclosure document DE 101 20 526 A1.
  • the cellulose obtained in a cellulose production process is initially loaded with an additive through a chemical precipitation reaction, preferably in accordance with the already mentioned U.S. patent document U.S. Pat. No. 5,223,090.
  • the already loaded cellulose is then dried and made available for subsequent use or shipment.
  • the present invention provides a method wherein carbon dioxide is added to the fibers or the cellulose in the form of a suspension, and the fibers or the cellulose in form of a suspension to which carbon dioxide has been added are mixed with milk of lime or slaked lime, such as in at least one reactor, thereby triggering and extensively, such as completely, concluding the chemical precipitation reaction.
  • the loaded cellulose can—as supported by the already mentioned disclosure document DE 101 20 526 A1—subsequently be dried and be made available or prepared for shipment for subsequent use.
  • the cellulose material can be made available for subsequent use or shipped in the form of bales, rolls or the like.
  • the cellulose itself can for example be manufactured in accordance with the sulphate and/or sulphite method.
  • the milk of lime or the slaked lime reacts to the introduction of carbon dioxide such, that crystalline structures are formed.
  • the shape of the forming conglomerates can be influenced partially by the volume of carbon dioxide and the speed of introducing the carbon dioxide and by the system temperature and possibly also substantially by the prevailing flow conditions.
  • Two basic types can be determined under the microscope: the rather rod shaped or the flat or round shaped structures.
  • the shape of the structure is especially significant with certain specialty papers. Cigarette paper, for example, requires rod-shaped structures in order to guarantee the necessary opacity at a defined porosity.
  • the carbon dioxide is added to the suspension in a unit which is located upstream from the reactor in the process sequence and which can be heated, or the carbon dioxide is added to the suspension in the reactor where the blending of the suspension with the milk of lime or the slaked lime can be staggered. Both methods offer individual advantages.
  • the suspension receives a massive carbon dioxide treatment prior to the chemical reaction.
  • the fibers enrich themselves with carbon dioxide on the inside and arrive practically “pre-loaded” in the actual reaction vessel.
  • the cellulose deposits itself around the respective surface of the fibers or the cellulose.
  • An additional improvement of the loading process is also made possible by the inventive method characterized in that the fibers or the cellulose themselves are “saturated” with carbon dioxide.
  • the milk of lime or the slaked lime therefore comes into contact already with the surfaces which are activated by the educt carbon dioxide. The precipitation reaction can therefore run its course in a shorter period of time and, above all, completely.
  • the first method also permits continuous adding of the carbon dioxide and/or continuous mixing with milk of lime or slaked lime.
  • the second method basically offers the same advantages, however it is disadvantageous that the addition of the carbon dioxide and the mixing process with the milk of lime or the slaked lime can occur only in batch operation.
  • the output volume in this second method is therefore accordingly reduced wherein however investment and even operational costs can be saved due to a simplified system design.
  • the first method offers a plurality of variations:
  • water for example fresh water or white water
  • milk of lime or slaked lime is added into the reactor itself prior to and/or during and/or after the addition of milk of lime or slaked lime. This allows a subsequent adjustment of the suspension's consistency.
  • Additional designs provide that the suspension is degassed by way of at least one degassing unit prior to the addition of the carbon dioxide and/or that the carbon dioxide is added to the suspension under pressure. Both specified designs contribute positively to a successful loading of the fibers or the cellulose in the course of the chemical reaction.
  • the carbon dioxide can be added to the suspension as pure carbon dioxide and/or as flue gas.
  • the flue gas can be taken for example from boilers or power plants. Both methods support the loading process, wherein the utilization of flue gas is generally probably more cost efficient.
  • suspension is produced by dissolving cellulose or waste paper with additives in at least one pulper, or is supplied to the loading process as a non-dried pulp which is also known as so-called “never dried pulp” for example from another pulp mill.
  • the reaction parameters are measured in at least one reactor and if necessary are utilized for the control of the chemical precipitation reaction.
  • the reaction parameters which are relevant for a reliable and optimum process progression include at least the pH-value, the temperature, the dwell time, the throughput of suspension and/or milk of lime or slaked lime.
  • At least the pH-value of the suspension as measured at the end of the reaction can be compared with a desired value and any deviation is ideally reduced or removed through at least one of the following correcting variables: addition of milk of lime or slaked lime, addition of carbon dioxide, throughput of suspension and/or the like.
  • the present invention also provides an apparatus for loading of fibers or cellulose which are contained in a suspension with a filler by way of a chemical precipitation reaction, wherein the fibers or cellulose are provided in the form of a suspension having a predetermined solids concentration.
  • This apparatus is characterized in that at least one reactor is provided in which the fibers or the cellulose in form of a suspension to which carbon dioxide has been added are mixed with milk of lime or slaked lime, thereby triggering and extensively, such as completely, concluding the chemical precipitation reaction.
  • inventive method and the inventive apparatus can also be applied in a suitable manner in the production of a fibrous web, especially a paper or cardboard web, wherein at least fibers or cellulose in the form of a suspension which were loaded according to the inventive method were utilized for the production of said web.
  • FIG. 1 is a schematic depiction of an apparatus for loading fibers which are contained in a suspension with a filler by way of a chemical precipitation reaction;
  • FIG. 2 is a schematic depiction of an additional apparatus for loading fibers which are contained in a suspension with a filler by way of a chemical precipitation reaction.
  • FIG. 1 there is shown a schematic depiction of a device 1 for loading fibers 2 . 1 or cellulose 2 . 2 which are contained in a suspension 3 with a filler 4 by way of a chemical precipitation reaction, wherein the fibers 2 . 1 or the cellulose 2 . 2 in form of a suspension 3 are made available with a pre-determined solids concentration c.
  • the apparatus 1 includes reactor 5 in which the fibers 2 . 1 or the cellulose 2 . 2 in form of a suspension 3 to which carbon dioxide 6 has been added are mixed with milk of lime or slaked lime 7 , thereby triggering and extensively, such as completely, concluding the chemical precipitation reaction.
  • the carbon dioxide 6 can be added to the suspension 3 as pure carbon dioxide and/or as flue gas.
  • the reactor 5 includes at least one supply line 8 for carbon dioxide 6 so that the carbon dioxide 6 can be supplied to the fibers 2 . 1 or to the cellulose 2 . 2 in form of a suspension 3 prior to and/or at the same time as the milk of lime or the slaked lime 7 is supplied via a line 9 .
  • the filler 4 in this scenario is calcium carbonate.
  • a supply line 11 is provided for water 10 which can be added prior to the addition of carbon dioxide and/or prior to and/or during and/or after the addition of milk of lime or slaked lime 7 .
  • a degassing unit 12 for the purpose of degassing the suspension 3 prior to adding of the carbon dioxide 6 , as well as a pressure generating unit 13 for the purpose of a pressurized addition of carbon dioxide 6 to the suspension 3 , are provided.
  • the known and purely schematically depicted degassing unit 12 is connected to the reactor 5 by way of a line 14 whereas the known and also purely schematically depicted pressure generating unit 13 is connected to the reactor 5 via the already present line 8 .
  • a pulper 15 which is known in the state of the art is provided in order to produce the suspension 3 by way of dissolving cellulose or waste paper through the use of additives.
  • the production of the suspension 3 can of course also occur through a supply of non-dried pulp.
  • the reactor 5 includes at least one system 16 to measure the reaction parameter and if necessary to adjust the chemical precipitation reaction.
  • the relevant reaction parameters include at least the pH-value, the temperature, the dwell time, the throughput of suspension and/or milk of lime or slaked lime.
  • a system of this type 16 including measuring devices and actuators or control elements are generally known and are therefore indicated merely exemplary.
  • reaction parameters can be in the following value ranges: pH-value of the suspension in the reactor between 6 and 11, preferably between 7 and 10; temperature of the suspension in the reactor between approximately ⁇ 15 and approximately 120° C., preferably between approximately 20 and approximately 90° C.; dwell time of the suspension in the reactor between 0.5 minutes and approximately 4 hours, preferably between 3 minutes and approximately 1 hour.
  • the throughput of the suspension and/or the milk of lime or slaked lime depends substantially upon the size of the reactor and cannot therefore be easily quantified.
  • FIG. 2 illustrates a schematic depiction of an additional apparatus 1 for loading fibers 2 . 1 or cellulose 2 . 2 which are contained in a suspension 3 with a filler 4 by way of a chemical precipitation reaction.
  • This device 1 is essentially based on the apparatus described in FIG. 1 , so that reference is made to said apparatus regarding basic components and their description.
  • the apparatus 1 also includes a reactor 5 in which the fibers 2 . 1 or the cellulose 2 . 2 in form of a suspension 3 are mixed with milk or lime or slaked lime 7 thereby triggering and largely, such as completely, concluding the chemical precipitation reaction.
  • a supply line 9 is provided for the addition of milk of lime or slaked lime 7 into the reactor.
  • this example includes a unit 17 which is located upstream from the reactor 5 in the process sequence and which can be heated and in which carbon dioxide 6 is added to the fibers 2 . 1 or to the cellulose 2 . 2 in form of a suspension.
  • the unit 17 includes at least one supply line 8 for carbon dioxide 6 .
  • the possible heating of the unit 17 in a known manner allows for a direct influence upon the reaction temperature of the subsequent chemical reaction.
  • the carbon dioxide 6 can be added to the suspension 3 as pure carbon dioxide and/or as flue gas.
  • the filler in this instance is then calcium carbonate.
  • the unit 17 which is located upstream from the reactor 5 in the process sequence includes at least one pump disperger 18 which produces shear forces during the addition of carbon dioxide 6 to the suspension 3 via the at least one supply line 8 .
  • a pump disperger 18 of this type is constructively and functionally already cited for example in the German disclosure document DE 101 07 448 A1. The content of said document is therefore included into the present description by way of reference.
  • the unit 17 which is located upstream from the reactor 5 in the process sequence can also include at least one stationary mixing system—for example a stationary mixer or a supply line through which the suspension flows—which causes mixing effects during the addition of the carbon dioxide to the suspension.
  • at least one stationary mixing system for example a stationary mixer or a supply line through which the suspension flows—which causes mixing effects during the addition of the carbon dioxide to the suspension.
  • at least a partially driven mixing system for example an agitator, which produces mixing effects while the carbon dioxide is added to the suspension.
  • the apparatus 1 also includes a degassing unit 12 for the purpose of degassing the suspension 3 prior to the addition of the carbon dioxide 6 , as well as a pressure generating unit 13 for the purpose of a pressurized addition of carbon dioxide 6 to the suspension 3 .
  • the known and purely schematically depicted degassing unit 12 is connected to the reactor 5 by way of a line 14
  • the known and also purely schematically depicted pressure generating unit 13 is connected to the reactor 5 via the already present line 8 .
  • a pulper 15 which is known in the state of the art is provided in order to produce the suspension 3 by way of dissolving cellulose or waste paper through the use of additives.
  • the production of the suspension 3 can of course also occur through a supply of non-dried pulp.
  • the reactor 5 again includes at least one system 16 to measure the reaction parameter and to possibly make adjustments to the chemical precipitation reaction.
  • the relevant reaction parameters include at least the pH-value, the temperature, the dwell time, the throughput of suspension and/or milk of lime or slaked lime.
  • a system of this type 16 including measuring devices and actuators or control elements are generally known and are therefore indicated merely as an example.
  • the apparatus 1 therefore is ideally suited for the production of a fibrous web in the production of which at least fibers 2 . 1 or cellulose 2 . 2 in the form of at least one suspension 3 were used which were loaded in accordance with the inventive method while utilizing the inventive apparatus 1 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
US11/748,814 2004-12-14 2007-05-15 Method and apparatus for loading fibers or cellulose which are contained in a suspension with a filler Abandoned US20080023161A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004060405.3 2004-12-14
DE102004060405A DE102004060405A1 (de) 2004-12-14 2004-12-14 Verfahren und Vorrichtung zum Beladen von in einer Suspension enthaltenen Fasern oder enthaltenem Zellstoff mit einem Füllstoff
PCT/EP2005/011498 WO2006063632A1 (de) 2004-12-14 2005-10-27 Verfahren und vorrichtung zum beladen von in einer suspension enthaltenen fasern oder enthaltenem zellstoff mit einem füllstoff

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/011498 Continuation WO2006063632A1 (de) 2004-12-14 2005-10-27 Verfahren und vorrichtung zum beladen von in einer suspension enthaltenen fasern oder enthaltenem zellstoff mit einem füllstoff

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US20080023161A1 true US20080023161A1 (en) 2008-01-31

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US (1) US20080023161A1 (de)
EP (1) EP1828478A1 (de)
CN (1) CN101091021A (de)
BR (1) BRPI0518040A (de)
CA (1) CA2590079A1 (de)
DE (1) DE102004060405A1 (de)
WO (1) WO2006063632A1 (de)

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JP2010176115A (ja) * 2009-01-30 2010-08-12 Samsung Electronics Co Ltd 表示板、薄膜トランジスター表示板および基板の修理方法
US20110000633A1 (en) * 2008-02-22 2011-01-06 Kukkamaeki Esko Method for crystallizing a filler in connection with a fiber web process, and an approach system for a fiber web machine
US8231764B2 (en) 2009-05-15 2012-07-31 Imerys Minerals, Limited Paper filler method
US20130126112A1 (en) * 2010-04-27 2013-05-23 Patrick A.C. Gane Process for the manufacture of structured materials using nano-fibrillar cellulose gels
US8871056B2 (en) 2009-03-30 2014-10-28 Omya International Ag Process for the production of nano-fibrillar cellulose gels
US8871057B2 (en) 2009-03-30 2014-10-28 Omya International Ag Process for the production of nano-fibrillar cellulose suspensions
EP2761080B1 (de) 2011-09-29 2017-05-17 Voith Patent GmbH Betriebsverfahren für eine stoffaufbereitung
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US10794006B2 (en) 2016-04-22 2020-10-06 Fiberlean Technologies Limited Compositions comprising microfibrilated cellulose and polymers and methods of manufacturing fibres and nonwoven materials therefrom
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DE102007007295A1 (de) * 2007-02-14 2008-08-21 Voith Patent Gmbh Verfahren zum Bilden von Füllstoffen, insbesondere Calciumcarbonat in einer Faserstoffsuspension
DE102007020324A1 (de) * 2007-04-30 2008-11-06 Voith Patent Gmbh Verfahren zur Bildung von Calciumcarbonat in einer Faserstoffsuspension
DE102007028540A1 (de) * 2007-06-21 2008-12-24 Voith Patent Gmbh Verfahren zum Bilden von Füllstoffen, insbesondere Calciumcarbonat in einer Faserstoffsuspension
DE102007028539A1 (de) * 2007-06-21 2008-12-24 Voith Patent Gmbh Verfahren zum Bilden von Calciumcarbonat in einer Faserstoffsuspension

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DE10120526A1 (de) * 2001-04-26 2002-10-31 Voith Paper Patent Gmbh Verfahren zur Herstellung von Zellstoff
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US10801162B2 (en) 2016-04-05 2020-10-13 Fiberlean Technologies Limited Paper and paperboard products
US11732421B2 (en) 2016-04-05 2023-08-22 Fiberlean Technologies Limited Method of making paper or board products
US11846072B2 (en) 2016-04-05 2023-12-19 Fiberlean Technologies Limited Process of making paper and paperboard products
US11572659B2 (en) 2016-04-22 2023-02-07 Fiberlean Technologies Limited Compositions comprising microfibrillated cellulose and polymers and methods of manufacturing fibres and nonwoven materials therefrom
US10794006B2 (en) 2016-04-22 2020-10-06 Fiberlean Technologies Limited Compositions comprising microfibrilated cellulose and polymers and methods of manufacturing fibres and nonwoven materials therefrom
CN114960280A (zh) * 2022-06-29 2022-08-30 重庆秋之艺文化用品有限公司 一种抗菌纸品生产***

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BRPI0518040A (pt) 2008-10-28
EP1828478A1 (de) 2007-09-05

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