US20090056888A1 - Process for loading a fibrous slurry with filler - Google Patents

Process for loading a fibrous slurry with filler Download PDF

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Publication number
US20090056888A1
US20090056888A1 US12/254,857 US25485708A US2009056888A1 US 20090056888 A1 US20090056888 A1 US 20090056888A1 US 25485708 A US25485708 A US 25485708A US 2009056888 A1 US2009056888 A1 US 2009056888A1
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US
United States
Prior art keywords
process according
loading
carrying
light fraction
fibrous slurry
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Abandoned
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US12/254,857
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English (en)
Inventor
Klaus Doelle
Joachim Henssler
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Voith Patent GmbH
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Voith Patent GmbH
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Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DOELLE, KLAUS, HENSSLER, JOACHIM
Publication of US20090056888A1 publication Critical patent/US20090056888A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the present invention relates to a process for loading a fibrous slurry with a filler.
  • the fibrous material is then brought into connection with carbon dioxide, and simultaneously subjected to a shear mixing process, in order to produce a fiber material having a considerable quantity of calcium carbonate in the hollow interiors and within the fiber walls of the pulp fibers as a result of precipitation.
  • DE 102 04 254 A1 discloses a further process for loading a fibrous slurry.
  • the process comprises the following steps: introduction of calcium hydroxide in liquid or dry form or of calcium oxide into the fibrous slurry, introduction of gaseous carbon dioxide into the fibrous slurry, and precipitation of calcium carbonate by the carbon dioxide.
  • the present invention provides a process, for producing fibrous material loaded with calcium carbonate (FLPCC or fiber loaded precipitated calcium carbonate), in particular for pulp production or for the use of pulp in papermaking.
  • the raw fibrous material to be loaded is produced, for example, from recycled paper, from DIP (deinked paper), from secondary fibrous material, bleached or unbleached chemical pulp, groundwood of any type, any paper raw chemical pulp, bleached or unbleached sulphate pulp, finished material broke, linen, cotton and/or hemp fibers (predominantly used for cigarette paper) and/or any other raw paper material which is used in a paper machine.
  • the process can be employed irrespective of the raw fibrous material to be loaded.
  • the area of application of the present invention extends to the production of paper and pulp and the process technology including the filler produced, and comprises areas of application in all grades of paper including packaging paper grades and the broke accumulating during production, which has a filler content of between 1% and 60% and/or has a white top layer with a filler content of between 1% and 60%.
  • the filler content can preferably lie between 5% and 50%.
  • the fractionation can beneficially be carried out with hydrocyclones, which produce a high centrifugal field which, for example, corresponds to 200 times the effect of the earth's force of gravity.
  • the process according to the present invention is carried out advantageously such that the different effect of the loading of the fibrous material suspension is either utilized or, by means of appropriate measures, is partly or completely compensated again.
  • a fibrous material suspension composed of various types of fibers is formed.
  • the loading is not the same in all the participating fibers.
  • a statistical influence is conceivable such that, on the basis of parameter fluctuations during the precipitation process, be they temporal or local, the precipitation is not uniform.
  • the different level of loading that is to say the quantity of precipitated crystals adhering to the fibers, permits fractionation following the loading process, in which at least two fractions with a different level of loading are formed. Since it is to be assumed that more highly loaded fibers are heavier than less highly loaded ones, the designations heavy fraction for fibers with a higher level of loading and light fraction for fibers with a lower level of loading are chosen here.
  • One embodiment of the present invention is to carry out the loading process again by way of recirculation of the light function in a part of the plant which is located before the loading, which is advantageous in particular, for example, when these fibers carried in the light fraction are able to achieve a significantly higher level of loading as a result of being loaded once more.
  • the reason may be that, on account of the fiber properties, a longer period for loading or a higher concentration of the chemicals would be more beneficial. In such cases, it is more economical not to tune the process to the “heaviest fibers” but to optimize it economically as a whole.
  • Another embodiment of the present invention is to use the specific fractions formed differently during the paper or board production. As is known, during the production of paper for the individual grades and, possibly, also layers on the paper machine, different quality requirements are set. It is therefore possible to improve the entire process of paper production by means of the fractionation.
  • the loading makes it possible to achieve a higher level of refining with energetic benefits; for example, up to 50% of the refining energy can be saved.
  • This has an effect in particular on all paper grades which pass through a refining process during the production and, above all, in those which have a high or very high level of refining, such as FL (FL fiber loaded) cigarette papers, FL printing and writing paper, FL sack kraft papers and FL filter papers.
  • FL FL fiber loaded
  • FL FL fiber loaded
  • FL sack kraft papers FL filter papers.
  • free filler which is not deposited in or on the fibers can be removed after the refining process or before the introduction of the fibrous slurry into the machine chest or before the supply to the paper machine.
  • the fibers themselves are, however, provided with filler on the outside and/or inside and outside, so that the positive effects of the fiber loading technology are maintained.
  • the loading has a positive effect on the production of all paper grades since, as a result of process-induced mechanical loadings in the various sections of the paper machine, such as in the press section, in the drying section or in the region in which the paper web is reeled up, the intermediate product produced and the end product to be produced is highly loaded mechanically by the use of reeling, winding, rewinding and converting machines.
  • a further advantage in using the technology according to the present invention in the paper grades listed above is that these can also be processed further in a calendar.
  • the fact that, when the fiber loading technology is used, fiber loading particles are deposited in, around and on the fibers means that blackening, i.e. calendar blackening, is avoided.
  • the starting material used is aqueous fibrous material, in particular 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 stock in a range between 0.01 and 60% of the proportion of solids present.
  • a static mixer, a mixing chest or a pulper system is used; in this case, a pH in the range between 7 and 12, preferably between 9 and 12, is used.
  • the reactivity of the calcium hydroxide is between 0.01 and 10 minutes, preferably between 1 second and 3 minutes.
  • Dilution water is mixed in accordance with predefined reaction parameters.
  • Carbon dioxide is mixed in accordance with the reaction parameters in a wet paper stock dimension. In the process, calcium carbonate is precipitated in the carbon dioxide atmosphere.
  • the process temperature preferably lies between ⁇ 15° C. and 120° C., in particular between 20° and 90° C.
  • Rhombohedric, scalenohedric 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.
  • 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 advantageously carried out at a pH between 6 and 10, in particular between 6.5 and 9.5.
  • the reaction time is between 0.03 seconds and 1 minute, in particular between 0.05 and 10 seconds.
  • precipitation product particles of rhombohedral form with a respective grain size in a range from about 0.05 to about 2 ⁇ m to be produced.
  • the solids concentration of the fibrous slurry provided for precipitation is chosen to lie in a range from about 0.1 to about 60% and preferably in a range from about 15 to 35%.
  • the carbon dioxide is added of the to the fibrous slurry at a temperature in a range from about 15 to about 120° C. and preferably in a range from about 20 to about 90° C.
  • FIG. 1 shows a schematic drawing of a plant to illustrate an example of the process according to the invention
  • FIG. 2 shows a variant of the process.
  • the fibrous material P for example, chemical pulp or deinked wastepaper, together with water W
  • Pulper 10 can be constructed conventionally, that is to say contain pulper screen 11 in its bottom region, and also pulper rotor 12 , which ensures circulation in the pulper and keeps pulper screen 11 free of blockages.
  • the fibrous material pulped in this way is fed to a number of cleaning apparatuses in the example shown here, which are illustrated symbolically as stock cleaner 14 and stock screen 15 .
  • screw press 16 in order to raise the consistency of the fibrous slurry S again.
  • Press filtrate 18 from screw press 16 can be sent back into pulper 10 for pulping.
  • Thickened fibrous material 19 then passes into crystalliser 20 which, with the aid of carbon dioxide gas 24 that is supplied, is used to trigger the desired precipitation of calcium carbonate in the form of finely distributed filler.
  • Carbon dioxide gas 24 is provided by carbon dioxide supply 21 and can be brought to the desired temperature in heat exchanger 22 with the aid of cooling or heating medium 23 .
  • temperature for example, the direct addition of steam, if an increase in the temperature is expedient.
  • the loaded fibrous slurry, possibly diluted with dilution water 27 is collected in storage chest 26 .
  • fractionation of the loaded fibrous slurry S′ directly or after intermediate treatment, such as refining, there follows fractionation of the loaded fibrous slurry S′.
  • a cleaner plant with highly effective hydrocyclones 13 is used here.
  • Fibers which are more highly loaded with adhering fillers are specifically heavier than less highly loaded fibers. They can also be stiffer.
  • the fractionation carried out in accordance with the invention in particular, when sedimentation or centrifugal forces are used, makes use of these differences. It is therefore possible to assume that heavy fraction 2 contains fibers more highly loaded with fillers than light fraction 1 .
  • Heavy fraction 2 is made available as fibrous slurry 28 , for example, to a paper machine, not shown.
  • the part of the plant shown in FIG. 1 for loading with fillers, in particular calcium carbonate is to be viewed only as a simplified example. In many cases, bleaching can also be integrated. More relating to carrying out the loading can be seen from the publications mentioned at the beginning.
  • the loading process is advantageously operated as an online process in the paper mill.
  • FIG. 2 shows a schematic drawing of a plant as an example, in which, however, the pulping and the pre-cleaning of the fibrous slurry are no longer illustrated. These can correspond to FIG. 1 or to comparable parts of the plant known per se.
  • it is possible for example to manage light fraction 1 that is to say that with the less loaded fibers, separately from heavy fraction 2 as far as headbox 32 of a paper or board machine.
  • the addition of further components 30 and 31 normally has to be carried out.
  • Headbox 32 in this example forms three layers.
  • Light fraction 1 is advantageously led into the inner layer and heavy fraction 2 into the outer layers, in particular, when the higher strength and/or the better retention of the more highly loaded fibers are to be used.
  • a plurality of layers can also be formed with the aid of a plurality of headboxes.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
US12/254,857 2006-06-28 2008-10-21 Process for loading a fibrous slurry with filler Abandoned US20090056888A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006029642.7 2006-06-28
DE102006029642A DE102006029642B3 (de) 2006-06-28 2006-06-28 Verfahren zum Beladen einer Faserstoffsuspension mit Füllstoff
PCT/EP2007/002535 WO2008000308A1 (de) 2006-06-28 2007-03-22 Verfahren zum beladen einer faserstoffsuspension mit füllstoff

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/002535 Continuation WO2008000308A1 (de) 2006-06-28 2007-03-22 Verfahren zum beladen einer faserstoffsuspension mit füllstoff

Publications (1)

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US20090056888A1 true US20090056888A1 (en) 2009-03-05

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US12/254,857 Abandoned US20090056888A1 (en) 2006-06-28 2008-10-21 Process for loading a fibrous slurry with filler

Country Status (9)

Country Link
US (1) US20090056888A1 (de)
EP (1) EP2038477A1 (de)
JP (1) JP2009541604A (de)
KR (1) KR20090031848A (de)
CN (1) CN101479427A (de)
BR (1) BRPI0712858A2 (de)
CA (1) CA2636454A1 (de)
DE (1) DE102006029642B3 (de)
WO (1) WO2008000308A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130126116A1 (en) * 2010-08-20 2013-05-23 Upm-Kymmene Corporation Method and a system for precipitation of calcium carbonate and a product comprising calcium carbonate
US10487452B1 (en) * 2017-01-26 2019-11-26 Kimberly-Clark Worldwide, Inc. Treated fibers and fibrous structures comprising the same

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100997254B1 (ko) 2008-09-18 2010-11-29 한국지질자원연구원 Ｉｎ－ｓｉｔｕ 프로세스를 통한 재활용 제지 제조방법
PL3617400T3 (pl) * 2009-03-30 2023-01-02 Fiberlean Technologies Limited Zastosowanie zawiesin nanofibrylarnej celulozy
EP2314765B1 (de) 2009-10-01 2017-11-29 bene_fit systems GmbH & Co. KG Herstellung eines faserverbundes, dessen verwendung und faserverbund
EP2365130A1 (de) 2010-02-18 2011-09-14 Bene_fit Systems GmbH & Co. KG Imprägnierter Faserverbund, dessen Herstellung und Verwendung
FI125836B (fi) 2013-04-26 2016-03-15 Wetend Tech Oy Menetelmä täyteaineen järjestämiseksi paperi- tai kartonkimassaan ja paperi tai kartonki
CN107190561A (zh) * 2017-07-26 2017-09-22 深圳市天橙宝投资发展有限公司 纸浆组合物以及纸浆组合物制品
KR102583061B1 (ko) * 2022-10-27 2023-09-26 주식회사 에쓰큐씨 패각 탄산칼슘을 함유하는 종이 및 그 제조방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292122A (en) * 1976-12-06 1981-09-29 Domtar Inc. Bonding properties of mechanical pulps
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
US5830364A (en) * 1992-12-23 1998-11-03 Ecc International Limited Process for the treatment of waste material suspensions
US20060032596A1 (en) * 2002-10-24 2006-02-16 Markku Leskela Method for producing fiber product

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522030A1 (fr) * 1982-02-19 1983-08-26 Scherb Metenett Papeteries Procede de blanchiment selectif de pate a papier et papier obtenu par mise en oeuvre de ce procede
FI100729B (fi) * 1995-06-29 1998-02-13 Metsae Serla Oy Paperinvalmistuksessa käytettävä täyteaine ja menetelmä täyteaineen va lmistamiseksi
US6579410B1 (en) * 1997-07-14 2003-06-17 Imerys Minerals Limited Pigment materials and their preparation and use
FI120463B (fi) * 2003-07-15 2009-10-30 Upm Kymmene Corp Menetelmä paperin valmistamiseksi ja paperi
GB0413068D0 (en) * 2004-06-11 2004-07-14 Imerys Minerals Ltd Treatment of pulp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292122A (en) * 1976-12-06 1981-09-29 Domtar Inc. Bonding properties of mechanical pulps
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
US5830364A (en) * 1992-12-23 1998-11-03 Ecc International Limited Process for the treatment of waste material suspensions
US20060032596A1 (en) * 2002-10-24 2006-02-16 Markku Leskela Method for producing fiber product

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130126116A1 (en) * 2010-08-20 2013-05-23 Upm-Kymmene Corporation Method and a system for precipitation of calcium carbonate and a product comprising calcium carbonate
US9051689B2 (en) * 2010-08-20 2015-06-09 Upm-Kymmene Corporation Method for precipitating calcium carbonate
US10487452B1 (en) * 2017-01-26 2019-11-26 Kimberly-Clark Worldwide, Inc. Treated fibers and fibrous structures comprising the same
US10563355B1 (en) * 2017-01-26 2020-02-18 Kimberly-Clark Worldwide, Inc. Treated fibers and fibrous structures comprising the same

Also Published As

Publication number Publication date
JP2009541604A (ja) 2009-11-26
BRPI0712858A2 (pt) 2012-07-31
KR20090031848A (ko) 2009-03-30
WO2008000308A1 (de) 2008-01-03
DE102006029642B3 (de) 2008-02-28
CA2636454A1 (en) 2008-01-03
EP2038477A1 (de) 2009-03-25
CN101479427A (zh) 2009-07-08

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Owner name: VOITH PATENT GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DOELLE, KLAUS;HENSSLER, JOACHIM;REEL/FRAME:021829/0784;SIGNING DATES FROM 20081023 TO 20081028

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