WO2008037840A1 - Procédé servant à ajouter une matière de charge à une suspension de fibres - Google Patents

Procédé servant à ajouter une matière de charge à une suspension de fibres Download PDF

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Publication number
WO2008037840A1
WO2008037840A1 PCT/FI2007/050465 FI2007050465W WO2008037840A1 WO 2008037840 A1 WO2008037840 A1 WO 2008037840A1 FI 2007050465 W FI2007050465 W FI 2007050465W WO 2008037840 A1 WO2008037840 A1 WO 2008037840A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibre
aluminium
aluminium hydroxide
fibre suspension
paper
Prior art date
Application number
PCT/FI2007/050465
Other languages
English (en)
Inventor
Jukka Selin
Original Assignee
Upm-Kymmene Corporation
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 Upm-Kymmene Corporation filed Critical Upm-Kymmene Corporation
Priority to DE112007000876T priority Critical patent/DE112007000876T5/de
Priority to GB0816304A priority patent/GB2455168A/en
Publication of WO2008037840A1 publication Critical patent/WO2008037840A1/fr

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
    • D21H17/64—Alkaline 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
    • 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
    • D21H17/66—Salts, e.g. alums
    • 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 according to the preamble of the appended claim 1 for adding filler to a fibre suspension.
  • fillers used in it.
  • the fillers have an effect on the appearance and the technical properties of the paper.
  • the fillers are normally inorganic and are based on minerals, and they consist of smaller particles that fit in the spaces of the fibre network of the paper. Fillers can be selected from a variety of inorganic minerals, and their content in the paper may be quite high.
  • a filler that is available from a filler supplier meets certain quality requirements and has a suitable particle size distribution, and it is admixed with other pulp components, and following this, the pulp having a suitable consistency is led from the headbox to the forming section, in which dewatering of the pulp sus- pension and the formation of paper to a cohesive fibre web are started.
  • One object in papermaking is to achieve good retention; in other words, as large an amount as possible of the paper pulp entering the wire should remain in the paper web forming on the wire.
  • fillers admixed with the paper pulp are left circulating in the circulation water of the paper machine, where problems are caused by them.
  • organic material is accumulated on their surface, causing discolouration of the fillers and thereby affecting the optical properties of the final product.
  • fillers left in the water circulations hinder the treatment of effluents from the paper mill, because the fillers are not burnt or degraded in biological effluent treatment.
  • the method according to the invention is primarily characterized in that at least one aluminium salt is dissolved into the fibre suspension, and aluminium hydroxide used as filler is precipitated onto the surface of the fibre by means of the pH conditions of the fibre suspension.
  • the method according to the invention is based on the idea that the fibre suspension is treated with an aluminium salt to form filler for the papermaking process.
  • aluminium hydroxide acting as filler can be precipitated onto the surface of the fibre.
  • the filler can be attached to the fibre and it does not remain circulating in the water circulations of the paper machine.
  • the present invention is different in that a starting material for the filler is admixed with the fibre suspension, after which the filler is formed and precipitated directly onto the surface of the fibre in the fibre suspension.
  • fibre suspension refers to an aqueous suspension which contains fibre material and whose consistency may vary.
  • the fibre suspension also refers to a clear filtrate that contains mostly water but also a small amount of short fibre.
  • aluminium salt is used for a compound that can be dissolved into an aqueous phase, wherein aluminium ions are released into the solution.
  • aluminium salt refers, for example, to aluminium sulphate, which is the most commonly used aluminium salt.
  • the fibre suspension prepared by the method according to the inven- tion can be used as a raw material for paper or paperboard.
  • the most significant advantage of the method according to the invention is the improvement in the optical properties of the final product.
  • the precipitation of aluminium hydroxide onto the surface of the fibre improves the optical properties by way of the brightness of the aluminium hydroxide and as a result of the fact that the fillers do not circulate in the water circulations of the paper machine, which causes their discolouration.
  • the method according to the invention has an opacity-improving effect.
  • the precipitating aluminium hydroxide is also used for binding other fillers to the surface of the fibre, for example kaoline, GCC (Ground Calcium Carbonate), titanium dioxide, and other possible fillers which have an anionic surface charge or which have been turned anionic.
  • the content of other fillers can also be reduced in the water circulations of the paper machine, where they have previously caused problems.
  • the better binding of the fillers to the fibres facilitates the treatment of effluents from the paper mill, because the fillers are not degraded in biological sewage treatment.
  • one advantage of the invention to be mentioned is the better filler retention compared with conventionally used methods, and thereby the reduction of solid matter discharges from the process.
  • Yet another advantage of the method according to the invention is a reduction in transportation costs, because the method makes it possible to prepare the filler from the starting materials in situ at the mill.
  • Fig. 1 shows aluminium hydroxide precipitated onto the surface of a fibre in a clear filtrate
  • Fig. 2 shows a fibre in a clear filtrate, totally covered with aluminium hydroxide
  • Fig. 3 shows aluminium hydroxide particles precipitated onto the surface of an unbleached refined fibre
  • Fig. 4 shows an aluminium hydroxide layer precipitated onto the surface of an unbleached refined fibre
  • Fig. 5 shows single aluminium hydroxide particles precipitated onto the surface of an unbleached refined fibre
  • Fig. 6 shows kaoline particles precipitated together with aluminium hydroxide onto the surface of a fibre.
  • An aluminium ion and the components formed by it are strongly dependent on the pH of the liquid phase. Consequently, changes in the pH of the liquid phase are utilized when precipitating the aluminium salt to aluminium hydroxide.
  • Aluminium is present as aluminium hydroxide in water primarily in the pH range from 6.5 to 8. Partly in this range, aluminium can also be present in other forms.
  • aluminium hydroxide in aqueous phase in more detail, using aluminium sulphate as a reactant.
  • aluminium sulphate (AI 2 (SO 4 ) 3 ) is dissolved into the aqueous phase, in this case a fibre suspension, wherein a trivalent aluminium ion and a sulphate ion are produced in the solution.
  • the pH of the solution is on the acidic side.
  • the precipitation of alumin- ium hydroxide AI(OH) 3 is possible by raising the pH of the solution, because aluminium is present in the form of aluminium hydroxide in aqueous phase in the pH range from 6.5 to 8.0. Therefore, the pH of the solution is raised with an alkaline solution, for example sodium hydroxide (NaOH), wherein aluminium is precipitated to aluminium hydroxide.
  • NaOH sodium hydroxide
  • the most optimal pH for the precipitation of aluminium hydroxide is 7.5.
  • Figures 1 to 6 show the precipitation of aluminium hydroxide onto the surface of fibres captured by a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • 100 ml of aluminium sulphate, whose relative density was 11.8 0 Be (degrees Baume), i.e. about 1088 kg/m 3 was added to two different samples, 200 ml of clear filtrate and unbleached TMP (Thermo Mechanical Pulp).
  • the fibre content of the samples was 100 mg/l.
  • the pH of the clear filtrate dropped from about 5 to 3.1.
  • the pH of the solution was then raised to 7.5 by adding sodium hydroxide, wherein the aluminium was precipitated to aluminium hydroxide.
  • aluminium hydroxide seems to precipitate as particles having primarily a rhombo- hedral shape.
  • Figures 1 and 2 show a fibre in a clear solution
  • Fig- ures 3 to 6 show a single unbleached refined fibre captured from a TMP sample.
  • Figures 1 , 3 and 5 show aluminium hydroxide precipitated on the surface of a fibre, partly in the form of single particles (Fig. 5).
  • Figure 4 also shows precipitated aluminium hydroxide forming a layer on the surface of an unbleached refined fibre.
  • aluminium hydroxide binds other fillers to the surface of the fibre, as shown in Fig. 6, where kaoline par- tides (flat large particles) are attached to the surface of the fibre.
  • the precipitation is performed by dissolving aluminium salt into the fibre suspension, after which the precipitation may take place by two different principles:
  • the fibre suspension has such pH conditions that result in the precipitation of aluminium hydroxide, or
  • the pH conditions of the fibre suspension are changed so that aluminium hydroxide will precipitate.
  • the pH conditions of the fibre suspension can be changed by purpose for precipi- tating aluminium hydroxide, or they become suitable in connection with the normal treatment process of paper pulp.
  • the pH conditions favourable for the precipitation are obtained, for example, by admixing an alkaline solution with the fibre suspension. The content of the addition depends on the pH conditions of the fibre suspension at the time. The precipitation to form aluminium hydroxide takes place in the pH range from 6.5 to 8.0.
  • the dissolution of the aluminium salt into the fibre suspension and the precipitation to form aluminium hydroxide are carried out in the short circulation of a paper or paperboard machine, as close to the headbox as possible.
  • the delay between the precipitation of the aluminium hydroxide and the spreading of the pulp onto the wire section is as short as possible, at the most about 15 s. In this way, good adhesion of fillers to the forming paper or paperboard web is achieved in the wire section, and thereby the filler contents in the water circulation of the paper mill can be reduced.
  • the aluminium salt can be dosed and dissolved into the aqueous phase also in a side flow or in a separate water circulation, after which the aqueous solution that contains aluminium salt is admixed with the fibre suspension in which aluminium hydroxide is precipitated either by changing the pH conditions of the fibre suspension, or the fibre suspension already has pH conditions that are favourable for the precipitation.
  • the dosage into the fibre suspension and the precipitation to form aluminium hydroxide take place in the short circulation as close to the headbox as possible, as presented above.
  • An alternative method is to admix aluminium salt directly with mechanical pulp before the aqueous fibre suspension is formed. After this, the precipitation to form aluminium hydroxide can be carried out as close to the headbox as possible, by changing the conditions to be favourable for the precipitation by the above-described methods.
  • the method does not set any constraints on the consistency of the pulp, at which the precipitation of aluminium hydroxide can take place.
  • the precipitation of aluminium hydroxide can take place, for example, in a clear filtrate which consists mostly of water but also contains short fibres. In this case, some of the aluminium ions will form aluminium hydroxide that is not attached to the surface of the fibre.
  • the risk of alkaline discolouration is smaller than when the precipitation takes place in a high consistency pulp, because the brightness of the pulps will decrease when the pH rises above six.
  • the content of the aluminium salt to be dissolved into the pulp can be used to adjust the content of aluminium hydroxide precipitating onto the surface of the fibres. Normally, excess quantities of aluminium salt are admixed with the fibre suspension to provide sufficient precipitation.
  • the precipitating aluminium hydroxide may also bind other fillers, which thus improves the retention of the fillers. Such fillers include, for example, kaoline, GCC, titanium dioxide, and other possible fillers which have an anionic surface charge or which have been turned anionic. The binding between aluminium hydroxide and other fillers is assumed to take place as chemical binding.
  • the filler retention can be improved by 20 to 60%, depending on the fillers used, compared with the conventionally used method, in which finished filler is admixed with the pulp.
  • the filler retention will depend on the pulp consistency, at which the precipitation of aluminium hydroxide has been performed. A better filler retention is obtained in high consistency pulps than, for example, in a clear filtrate, because in high consistency pulps most of the aluminium hydroxide is attached to the fibre.
  • the optical properties of the paper pulp are improved by way of the brightness of the aluminium hydroxide, because the ISO brightness of aluminium hydroxide is 98.
  • the improvement in the optical properties is also a result from the fact that when aluminium hydroxide is formed, it is attached to the surface of the fibre and does not remain circulating in the circulation waters, which causes discolouration of fillers.
  • the method according to the invention has an opacity- improving effect on the final product.
  • the method according to the invention is suitable for a variety of pulps, including chemical, mechanical, chemimechanical, or thermomechani- cal pulps, as well as recycled pulp, or mixtures of these pulps.
  • the paper pulp formed by the fibre suspension according to the invention, treated with aluminium salt, is led to the forming section of a paper or paperboard machine, and paper or cardboard is made of it in the form of a continuous web by letting it infiltrate through a forming medium that is permeable to water.
  • the fibre suspension according to the invention can thus be used as a raw material for paper, paper- board, or another corresponding web or pulp product made of a fibrous material.
  • aluminium hydroxide is precipitated by adding e.g. aluminium sulphate to water, for example circulation water, and by adjusting the pH of the water to be suitable for precipitation, for example by using sodium hydroxide.
  • the formed salt can be ground to a desired particle size and shape.
  • the aluminium hydroxide can be admixed with the pulp components according to common practice.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)

Abstract

L'invention concerne un procédé servant à ajouter une matière de charge à une suspension de fibres, ledit procédé consistant à dissoudre au moins un sel d'aluminium dans la suspension de fibres et à faire précipiter de l'hydroxyde d'aluminium servant de matière de charge sur la surface des fibres en ajustant le pH de la suspension de fibres.
PCT/FI2007/050465 2006-09-25 2007-08-30 Procédé servant à ajouter une matière de charge à une suspension de fibres WO2008037840A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112007000876T DE112007000876T5 (de) 2006-09-25 2007-08-30 Verfahren zum Zugeben eines Füllstoffes zu einer Fasersuspension
GB0816304A GB2455168A (en) 2006-09-25 2007-08-30 A method for adding filler to a fibre suspension

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20065589 2006-09-25
FI20065589A FI20065589L (fi) 2006-09-25 2006-09-25 Menetelmä täyteaineen lisäämiseksi kuitususpensioon

Publications (1)

Publication Number Publication Date
WO2008037840A1 true WO2008037840A1 (fr) 2008-04-03

Family

ID=37067240

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2007/050465 WO2008037840A1 (fr) 2006-09-25 2007-08-30 Procédé servant à ajouter une matière de charge à une suspension de fibres

Country Status (5)

Country Link
CN (1) CN101432483A (fr)
DE (1) DE112007000876T5 (fr)
FI (1) FI20065589L (fr)
GB (1) GB2455168A (fr)
WO (1) WO2008037840A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB818652A (en) * 1956-04-23 1959-08-19 Armstrong Cork Co Manufacture of paper or the like
US3074843A (en) * 1958-10-24 1963-01-22 Linden Lab Process for treating cellulose and other materials
US4911790A (en) * 1987-01-09 1990-03-27 Stfi Paper production
WO1997039188A1 (fr) * 1996-04-15 1997-10-23 Stora Kopparbergs Bergslags Aktiebolag Procede de preparation de pate cellulosique, pate cellulosique utile dans des produits absorbants, et un tel produit absorbant
US6942726B2 (en) * 2002-08-23 2005-09-13 Bki Holding Corporation Cementitious material reinforced with chemically treated cellulose fiber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB818652A (en) * 1956-04-23 1959-08-19 Armstrong Cork Co Manufacture of paper or the like
US3074843A (en) * 1958-10-24 1963-01-22 Linden Lab Process for treating cellulose and other materials
US4911790A (en) * 1987-01-09 1990-03-27 Stfi Paper production
WO1997039188A1 (fr) * 1996-04-15 1997-10-23 Stora Kopparbergs Bergslags Aktiebolag Procede de preparation de pate cellulosique, pate cellulosique utile dans des produits absorbants, et un tel produit absorbant
US6942726B2 (en) * 2002-08-23 2005-09-13 Bki Holding Corporation Cementitious material reinforced with chemically treated cellulose fiber

Also Published As

Publication number Publication date
GB0816304D0 (en) 2008-10-15
CN101432483A (zh) 2009-05-13
GB2455168A (en) 2009-06-03
FI20065589A0 (fi) 2006-09-25
FI20065589L (fi) 2008-03-26
DE112007000876T5 (de) 2009-02-19

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