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EP2038477A1 - Procede pour ajouter une charge a une suspension de fibres - Google Patents

Procede pour ajouter une charge a une suspension de fibres

Info

Publication number
EP2038477A1
EP2038477A1 EP07723492A EP07723492A EP2038477A1 EP 2038477 A1 EP2038477 A1 EP 2038477A1 EP 07723492 A EP07723492 A EP 07723492A EP 07723492 A EP07723492 A EP 07723492A EP 2038477 A1 EP2038477 A1 EP 2038477A1
Authority
EP
European Patent Office
Prior art keywords
loading
pulp
pulp suspension
light fraction
loaded
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Withdrawn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
EP07723492A
Other languages
German (de)
English (en)
Inventor
Klaus Doelle
Joachim Henssler
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 EP2038477A1 publication Critical patent/EP2038477A1/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Withdrawn legal-status Critical Current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
    • 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 invention relates to a method for loading a pulp suspension according to the preamble of claim 1.
  • US 5,223,090 discloses a process employing fibrous material having elongated fibers with a cell wall surrounding a cavity, the fibers having a humidity sufficient to form a dewatered pulp slurry.
  • the fibers have a moisture content corresponding to a proportion of 40 to 50% of the weight of the fibers.
  • the water is essentially present inside the fibers and inside the fiber walls.
  • calcium oxide or calcium hydroxide is added to the pulp so that at least part of the incorporated calcium oxide or calcium hydroxide is associated with the water present in the pulp.
  • the fibrous cellulosic material is contacted with carbon dioxide while simultaneously subjected to a shear mixing process to produce a fibrous material having a substantial amount of calcium carbonate in the hollow interior and within the fibrous walls of the cellulosic fibers by precipitation.
  • a further method for loading a pulp suspension comprises the following steps: introduction of calcium hydroxide in liquid or dry form or of calcium oxide into the pulp suspension, introduction of gaseous carbon dioxide into the pulp suspension, precipitation of calcium carbonate by the carbon dioxide.
  • fiber loaded with calcium carbonate fiber loaded precipitate calcium carbonate
  • the process can be used independently of the fiber raw material to be loaded.
  • the field of application of the invention extends to paper and pulp production and process technology, including the filler produced, and includes applications of all paper grades, including packaging paper grades and production-related rejects, having a filler content between 1% and 60%, and / or a white topcoat having a filler content between 1% and 60%.
  • the filler content may be between 5% and 50%.
  • Treating a pulp suspension in papermaking with fiber-loading technology results in a completely new product that has new and improved properties over the products known in the market. Such a process allows, directly in the stock preparation in one
  • the fractionation may conveniently be carried out with hydrocyclones which produce a high centrifugal field, eg 200 times the gravitational field of the earth.
  • pressure sorters especially if they are designed as fiber fractionators, ie provided with fine screen openings.
  • pressure sorters especially if they are designed as fiber fractionators, ie provided with fine screen openings.
  • multi-stage separation systems and / or combinations of different separation principles are conceivable.
  • the inventive method is carried out with particular advantage so that the different effect of loading the pulp suspension is either used or compensated by appropriate measures partially or completely.
  • a loading method embodying this invention e.g. a pulp suspension composed of different fibers is formed. Due to the different properties, it is possible that the loading is not the same for all participating fibers. In addition, a statistical influence is conceivable such that, due to parameter variations during the precipitation process, whether temporal or local, precipitation is not uniform.
  • the different degree of loading that is to say the amount of precipitated crystals adhering to the fibers, makes it possible to carry out a fractionation subsequent to the loading process in which at least two fractions having different degrees of loading are formed. Since heavier loaded fibers are expected to be heavier than less heavily loaded fibers, the terms heavier fraction for higher load fiber and light fraction for lower load fiber are used herein.
  • the first possibility is to recycle the light fraction into a plant part which is before loading, to perform the loading process again, which is e.g. is particularly advantageous if they are guided in the light fraction
  • Fibers by a re-loading a significantly higher degree of loading reachable The cause may be that, due to the fiber properties, a longer loading time or a higher concentration of the chemicals would be more favorable. In such cases it is more economical not to tune the process to the "most difficult fibers", but to optimize the overall economy.
  • the second possibility is to selectively use the fractions formed in paper or board production.
  • different quality requirements are placed on paper production for the individual grades and possibly also layers on the paper machine. It is therefore possible to improve the overall process of paper production through fractionation.
  • the loading has a positive effect on the production of all types of paper, since by process-related mechanical stresses in the various sections of the paper machine, as in the press section, the dryer section or in the area in which the paper web is rolled, the intermediate product produced and the end product to be produced is mechanically stressed by the use of reeling, winding, reeling and converting machines.
  • Another advantage of using the technology of the invention in the above listed paper types is that they can be further processed in a calender.
  • fiber-loading technology fiber-loading particles are deposited in, around and on the fibers, thus avoiding blackening, ie black satin coating.
  • the starting material used is aqueous fibrous material, in particular aqueous paper stock, of from 0.1 to 20% consistency, preferably between 2 and 8%.
  • Calcium hydroxide in aqueous or in dry form or calcium oxide is mixed in a range between 0.01 and 60% of the existing solids content in the aqueous paper pulp.
  • a static mixer, a receiver chest or a material dissolving 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 according to given reaction parameters.
  • Carbon dioxide is mixed in accordance with the reaction parameters in a moist pulp dimension. Calcium carbonate precipitates in the carbon dioxide atmosphere.
  • the process temperature is between -15 ° C and 120 ° C, in particular between 20 ° and 90 ° C.
  • rhombohedral, scalenohedral and spherical crystals are produced, wherein the crystals dimensions between 0.05 and 5 .mu.m, in particular between 0.3 and 2.5 ⁇ m.
  • Static and / or mobile, in particular rotating, mixing elements are used to produce a fibrous suspension laden 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 advantageously carried out at a pH of 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.
  • precipitate product particles of a rhombohedral shape having a respective cube size in a range of about 0.05 to about 2 ⁇ m can be produced.
  • the solids concentration of the pulp suspension provided for precipitation is selected 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 to the pulp suspension at a temperature in a range of about -15 to about 120 ° C and preferably in a range of about 20 to about 9O 0 C.
  • FIG. 1 system diagram to illustrate an example of the invention
  • Fig. 2 shows a variant of the method.
  • FIG. 1 shows by way of example a system with the most important method steps and devices.
  • the pulp P for example, pulp or deinked waste paper
  • a pulper 10 may be conventionally built, ie in its bottom area containing a pulper screen 11 and a pulper rotor 12, which provides for the Umtrieb in the pulper and the pulper screen 11 keeps free of blockages.
  • the pulp thus dissolved is supplied to a plurality of cleaning devices, which are symbolically represented as a fabric cleaner 14 and a fabric sorter 15. It then follows a screw press 16 to raise the consistency of the pulp suspension S again.
  • the press filtrate 18 of the screw press 16 can be recycled for dissolution in the pulper 10.
  • the thickened pulp 19 then passes into a crystallizer 20, which serves to initiate the desired precipitation of calcium carbonate in the form of finely divided filler with the aid of supplied carbon dioxide gas 24.
  • the carbon dioxide gas is provided by a carbon dioxide supply 21 and can be brought in a heat exchanger 22 by means of a cooling or heating means 23 to the desired temperature. But there are other possibilities for temperature control, for example, the direct addition of steam, if an increase in temperature is appropriate.
  • a Vorratsbütte 26 the loaded pulp suspension is collected, possibly diluted with dilution water 27.
  • a fractionation of the loaded pulp suspension S ' It then follows directly or after an intermediate treatment, such as grinding, a fractionation of the loaded pulp suspension S ' .
  • a cleaner system with highly effective hydrocyclones 13 is used here by way of example and with advantage.
  • Fibers that are more heavily loaded with adhesive fillers are specifically heavier than less heavily loaded fibers. They can also be stiffer.
  • the fractionation carried out according to the invention in particular when using sedimentation or centrifugal forces, makes use of these differences. It is therefore to be assumed that the heavy fraction 2 contains fibers loaded with fillers more strongly than the light fraction 1.
  • the light fraction 1 is recirculated here in the loading process, ie guided into the inlet of the screw press 16.
  • the heavy fraction 2 stands as Pulp suspension 28 eg a - not shown - paper machine available.
  • the plant part shown in Fig. 1 for loading with fillers, in particular calcium carbonate, is to be regarded only as a simplified example. In many cases, a bleach can be integrated. More details on the implementation of the load can be seen from the publications mentioned above.
  • the loading process is advantageously operated as an online process in the paper mill.
  • the fractionation of the loaded pulp can also be used to produce different material qualities or to provide different qualities in paper production.
  • Figure 2 shows a plant scheme as an example, in which, however, the resolution and the pre-cleaning of the pulp suspension are no longer shown. This can correspond to that of FIG. 1 or comparable plant components known per se.
  • Heavy fraction 2 to lead the headbox 32 of a paper or board machine separately.
  • the addition of further components 30, 31 to lead the headbox 32 of a paper or board machine separately.
  • the headbox 32 forms three layers in this example.
  • the light fraction 1 is guided into the inner layer and the heavy fraction 2 into the outer layers, in particular if the higher strength and / or the better retention of the higher-loaded fibers are to be utilized.
  • Several layers can also be formed with the help of several headboxes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

Le procédé selon l'invention sert à ajouter une charge et en particulier du carbonate de calcium à une suspension de fibres S (charge de fibres). Selon l'invention, la suspension de fibres S' chargée est divisée en au moins deux fractions, une fraction légère (1) et une fraction lourde (2), et dans ce but, on utilise dans un mode de réalisation avantageux des hydrocyclones (13). Les différentes fractions ont un degré de chargement différent, c'est-à-dire que la quantité des charges précipitées et adhérant aux fibres est à chaque fois différente. Il est possible de renvoyer les fibres moins fortement chargées dans l'opération de chargement pour encore augmenter le degré de chargement de cette fraction.
EP07723492A 2006-06-28 2007-03-22 Procede pour ajouter une charge a une suspension de fibres Withdrawn EP2038477A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006029642A DE102006029642B3 (de) 2006-06-28 2006-06-28 Verfahren zum Beladen einer Faserstoffsuspension mit Füllstoff
PCT/EP2007/002535 WO2008000308A1 (fr) 2006-06-28 2007-03-22 procédé pour ajouter une charge à une suspension de fibres

Publications (1)

Publication Number Publication Date
EP2038477A1 true EP2038477A1 (fr) 2009-03-25

Family

ID=38169389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07723492A Withdrawn EP2038477A1 (fr) 2006-06-28 2007-03-22 Procede pour ajouter une charge a une suspension de fibres

Country Status (9)

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

Families Citing this family (9)

* 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
PT2236664E (pt) * 2009-03-30 2016-03-04 Omya Int Ag Processo para a produção de suspensões de celulose nanofibrilar
EP2314765B1 (fr) 2009-10-01 2017-11-29 bene_fit systems GmbH & Co. KG Fabrication d'un composite en fibre, son utilisation et composite en fibre
EP2365130A1 (fr) 2010-02-18 2011-09-14 Bene_fit Systems GmbH & Co. KG Composite de fibres imprégné, sa fabrication et son utilisation
FI125278B (fi) * 2010-08-20 2015-08-14 Upm Kymmene Corp Menetelmä kalsiumkarbonaatin saostamiseksi sekä menetelmän käyttö
FI125836B (fi) 2013-04-26 2016-03-15 Wetend Tech Oy Menetelmä täyteaineen järjestämiseksi paperi- tai kartonkimassaan ja paperi tai kartonki
WO2018140252A1 (fr) * 2017-01-26 2018-08-02 Kimberly-Clark Worldwide, Inc. Fibres traitées et structures fibreuses les comprenant
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

Family Cites Families (9)

* 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
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
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
PT604095E (pt) * 1992-12-23 2001-10-31 Imerys Minerals Ltd Processo para o tratamento da suspensoes de material residual
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
FI122074B (fi) * 2002-10-24 2011-08-15 M Real Oyj Menetelmä kuitutuotteen valmistamiseksi
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008000308A1 *

Also Published As

Publication number Publication date
CA2636454A1 (fr) 2008-01-03
BRPI0712858A2 (pt) 2012-07-31
WO2008000308A1 (fr) 2008-01-03
JP2009541604A (ja) 2009-11-26
DE102006029642B3 (de) 2008-02-28
KR20090031848A (ko) 2009-03-30
US20090056888A1 (en) 2009-03-05
CN101479427A (zh) 2009-07-08

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