WO2006097180A1 - Procede et dispositif pour charger en matiere de charge des fibres contenues dans une suspension de matiere fibreuse - Google Patents

Procede et dispositif pour charger en matiere de charge des fibres contenues dans une suspension de matiere fibreuse Download PDF

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Publication number
WO2006097180A1
WO2006097180A1 PCT/EP2006/001587 EP2006001587W WO2006097180A1 WO 2006097180 A1 WO2006097180 A1 WO 2006097180A1 EP 2006001587 W EP2006001587 W EP 2006001587W WO 2006097180 A1 WO2006097180 A1 WO 2006097180A1
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WO
WIPO (PCT)
Prior art keywords
pulp suspension
screw
pulp
arrangement according
suspension
Prior art date
Application number
PCT/EP2006/001587
Other languages
German (de)
English (en)
Inventor
Klaus Doelle
Stefan Hartmann
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 WO2006097180A1 publication Critical patent/WO2006097180A1/fr

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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
    • 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
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/342—Mixing apparatus

Definitions

  • the invention relates to a method for charging a pulp suspension with
  • Pulp suspension is formed, wherein the pulp suspension is at least partially compressed in a screw, introducing gaseous carbon dioxide into the moist pulp suspension,
  • 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.
  • DE 197 12 653 A1 discloses a method and a device for dispersing paper pulp.
  • the paper pulp is converted into fine Faserstoffkrümel so that it can be heated relatively quickly to the temperature required for dispersing.
  • the heating and dispersing of the pulp takes place according to the invention in the same apparatus, in particular in a disperser.
  • this object is achieved in that the pulp suspension is heated by steam in the region of the screw.
  • Tissue paper is produced at a very low basis weight, depending on the final product to be produced, for example, cellulosic filling material (8 to 30 g / m 2 ), cosmetic or tissue paper for the sanitary sector (14 to 25 g / m 2 ), sanitary paper (8 to 30 g / m 2 ), napkin paper (20 to 30 g / m 2 ) and tissue paper (20 to 40 g / m 2 ) is between 8 and 40 g / m 2 .
  • Another factor is the low degree of grinding of the tissue papers, which is required for a high suction and drying capacity of the end products. As is known, the freeness is an important parameter for determining the mechanical properties of each paper product.
  • the invention describes a method for producing a loaded one
  • the material that is currently used in a conventional process is currently either a precipitated material or an artificial material, such as plastic.
  • a precipitated material such as plastic.
  • an artificial material such as plastic.
  • the conventional materials can be replaced by the fiber-loading process.
  • sanitary papers, tissue paper, wax tissue paper, wrapping papers for example, for fruits and vegetables, various toilet, sanitary or cosmetic papers, tissue papers, napkin or diaper papers, wipes, wax papers, wrapping papers, all for sanitary, but also for non-sanitary use, as well as various other tissue products.
  • Cigarette paper is a paper with a basis weight of 16 to 26 g / m 2 . It should be very thin, smoldering and tasteless. In addition, it should have good optical values with respect to the whiteness. The glowing power is usually achieved through impregnation to leave a good-looking white ash. Cigarette paper is mostly made from linen or hemp fibers, cotton, sulphate pulp, papermaking pulp and other fiber sources. The filler content of cigarette paper is between 5 and 40%, with 30% being the standard value.
  • Packaging papers and cardboard can be divided into three main classes:
  • Crate board for packaging applications crate board for consumer packaging applications and specialty papers such as wallpaper,
  • Packaging papers are usually called multilayer - A -
  • Product produced with basis weights above 150 g / m 2 The freeness varies from 600 to 50 CSF or 20 to 80 0 SR, based on the final product produced.
  • Sack papers require high porosity and high mechanical strength to meet the high demands of rough handling during filling and during use, such as cement bags.
  • the paper must be strong enough to absorb shock, and accordingly have a high rate of energy absorption.
  • the sack paper must also be porous and sufficiently air permeable to ensure easy filling.
  • Sack papers are commonly produced as a product having basis weights between 70 and 80 g / m 2 from a long fiber kraft pulp and with a freeness between 600 to 425 CSF or 20 to 30 ° SR.
  • a medium freeness, as described above, is sought, which is usually achieved by high consistency milling, while conventional grades of paper, such as graphic papers, use low consistency milling. The result of the high consistency milling are good connections between the fibers and a high porosity.
  • the sack kraft paper is predominantly made from bleached and unbleached fibers, with a filler content of 5 to 15% in the sack paper produced.
  • Filter paper requires a high controlled porosity and pore distribution. It must have a sufficiently high mechanical strength to counteract the flow of the medium to be filtered.
  • Filter paper is produced with a basis weight of 12 to 1200 g / m 2 .
  • an air filter it is between 100 and 200 g / m 2
  • an oil and fuel filter between 50 and 80 g / m 2
  • for a coffee filter up to 100 g / m 2 with a teabag between 12 and 20 g / m 2 and with a vacuum cleaner bag between 100 and 150 g / m 2 .
  • All filters are bleached and bleached from a variety of fibers, such as pulp fibers unbleached fibers, Kraft pulp, DIP (deinked) paper, recycled fiber, TMP (thermo-mechanical) paper, etc.
  • the invention is suitable, but especially for the production of tissue papers for various applications.
  • a new process for producing a fibrous web in particular a tissue web and new tissue products, is created, in which the process of fiber loading (loading of the fibrous suspension with calcium carbonate) is integrated.
  • This process allows the production of individual calcium carbonate particles which are equally spaced and which adhere well to and coat the fibers uniformly. This is achieved through an online manufacturing process in which the calcium carbonate is generated simultaneously with the processing of the pulp suspension.
  • filler particles are introduced into the pulp suspension according to the following variables or constraints: a wet pulp suspension, calcium or calcium hydroxide in liquid or dry form, carbon dioxide, a gas feed area, a stator co-operating with a stator, producing the crystals in a gas atmosphere without the use of mixing energy.
  • the pulp suspension After being mixed with calcium hydroxide, the pulp suspension is introduced into a disperser, fluffer or refiner, the pulp suspension having a solids content of between 5 and 60%, in particular between 15 and 35%.
  • a disperser fluffer or refiner
  • the pulp suspension is contacted with carbon dioxide.
  • the carbon dioxide can be added at temperatures between -15 ° C and 120 ° C, especially in a temperature range between 20 ° C and 90 ° C.
  • the pulp suspension enters a gas zone in which each individual fiber is exposed to a gas atmosphere, so that directly the reaction of the Calcium hydroxide to calcium carbonate occurs. This forms different crystal types, for example rhombohedral or scalenohedral crystals. The crystal size depends on the selected temperature range, the carbon dioxide and the Calciumhydroxdid content in the pulp suspension.
  • pulp suspension After this pulp suspension has passed through a zone for the introduction of carbon dioxide and the precipitated calcium carbonate crystals have formed in the lumen on the fibers and embedded between the fibers, they are passed between a stator and a rotor, whereby the final position of the crystals in the pulp suspension induced becomes; Here, only a low shear energy is used.
  • the shape of the filler particles is substantially rhombohedral with a spatial size in the range between 0.05 and 2.0 microns or scalenohedrisch with a length between 0.05 and 2.0 microns and a diameter between 0.01 and 0.5 microns in Dependence on the paper quality used.
  • the concentration of the pulp suspension flowing past the rotor disk is between 0.1 and 50%, preferably between 5 and 35%.
  • the pressure used in the carbon dioxide feed line is between 0.1 and 6 bar, preferably between 0.5 and 3 bar, to ensure uniform delivery of the carbon dioxide and to maintain the chemical reaction. Since the carbon dioxide is a compressible gas, the feed can be increased slightly with increasing pressure to ensure complete reaction with the calcium hydroxide.
  • the supply of carbon dioxide and thus the precipitation reaction to calcium carbonate is controlled by the pH. This should be between 6.0 and 10.0, preferably between 7.0 and 8.5.
  • the energy used in this process is between 0.3 kWh / t and 8 kWh / t, preferably between 0.5 kWh / t and 4 kWh / t.
  • dilution water is added and mixed with the pulp suspension to achieve a final dilution of the filler-laden pulp suspension ranging between 0.1 and 16% solids, preferably between 2 and 6% solids.
  • the pulp suspension is introduced at normal pressure in a subsequent machine or chest or in a paper machine.
  • the rotational speed of the rotor is at its outer diameter between 20 and 100 m / s, preferably between 40 and 60 m / s.
  • the gap between the rotor and the stator has a width between 0.5 and 100 mm, preferably between 25 and 75 mm.
  • the diameter of the rotor and the stator is between 0.5 m and 2 m.
  • the reaction time is preferably between 0.01 and 60 seconds, preferably between 0.1 and 10 seconds.
  • Fibrous fibers have a lower water retention level of between 2 and 25%, depending on the pulp used. This will be a more economical
  • Pulp suspension can be removed, and the sheet dries faster.
  • the free precipitated calcium carbonate i. H. the calcium carbonate not bound in or on the fibers to be removed by a washing process before the
  • Pulp suspension is forwarded to a paper machine, or even more before the grinding process. Also in this case, calcium carbonate-covered fibers remain, giving the advantage of good drainability and good drying as well as less rewetting of the finished tissue product.
  • the fiber loading process can be implemented as needed for the final product before or after a milling process. Since the loading of the pulp gives higher freeness values, a higher freeness can be achieved, which leads to better mechanical properties of the final product. The better water retention and better drying also have a positive effect if the product is to be printed later.
  • vapor is introduced from openings in a shaft of the screw in the pulp suspension.
  • the openings are in the lateral surface and / or additionally on a side facing a downstream transfer cylinder end face.
  • a further advantage results if the pulp suspension is subsequently converted and dispersed in a pulp crumb in a comminution step.
  • Another advantage is a method in which the pulp suspension is mixed in an arrangement with relatively rotating plates, in particular with a stator and a rotor, with low shear energy.
  • the invention also relates to an arrangement for carrying out one of the methods listed above.
  • the arrangement is characterized in that it has a
  • Screw for thickening the pulp suspension and heating the Fiber suspension by means of steam one of the screw in the transport direction of the pulp suspension downstream transfer cylinder and a disperser comprises.
  • the screw is designed as a screw press.
  • the screw comprises a shaft formed as a hollow shaft through which heating steam can be passed, which can be introduced from openings in the shaft in the pulp suspension.
  • the transfer cylinder comprises rotation crushers for receiving a component of movement of the pulp suspension in the direction of rotation.
  • the disperser comprises a distribution cross.
  • the crystalliser has a disc set of triangular finishes whose teeth are e.g. seen in the circumferential direction have a triangular contour.
  • An advantageous arrangement is also characterized in that supply lines for introducing reactants, in particular chemicals, are connected to the transfer cylinder and / or the disperser.
  • a further advantageous arrangement is that at the Disperger a circular surrounding supply line for water is connected.
  • filler calcium oxide or calcium hydroxide
  • the screw press 1 comprises a motor-driven hollow shaft 3, through which heating steam is introduced in the direction of an arrow A 1, which also denotes the direction of movement of the pulp suspension or pulp. This flows out of openings 4 of the hollow shaft 3 out to heat the pulp suspension.
  • a coil 5 Around the hollow shaft 3 around a coil 5 extends, which presses the pulp suspension so that the water escapes from the holes in the casing wall 2.
  • the transfer cylinder 8 is provided with rotation crushers 9, d. H. with projections on the inside of its shell wall, which receive the rotational component in the movement of the pulp suspension. Subsequently, this is forwarded to a distribution cross 10 of a disperser or crystallizer 11.
  • the pulp suspension passes through a gap of a crystallizer pulley set 12 comprising a stator 13 and a rotor 14.
  • the rotor 14 preferably moves together with the distribution cross 10.
  • the stator 13 and the rotor 14 each have projections with a triangular cross-section to comminute the pulp.
  • a shaft 15, on the rotor 14 is mounted, can be moved in the direction of a double arrow B to change the gap width of the gap between the stator 13 and the rotor 14. It is understood that alternatively and / or additionally, the stator can be arranged to be movable in the direction of arrow B.
  • a supply line 16 is provided for supplying carbon dioxide. It can also be provided several, distributed over the circumference leads. Or it is an annular ring over the circumference of the transfer cylinder 8 extending, supplied by one or more leads with carbon dioxide feed ring available to achieve the most uniform distribution of carbon dioxide in the pulp suspension. Likewise, at least one supply line 17 for reaction chemicals is provided in the connection region of the transfer cylinder 8 to the crystallizer 11.
  • a drain line 19 for the pulp suspension, d. H. the Accept provided, which is forwarded from there to further processing units, for example, to a refiner, or directly to a machine for producing a fibrous web.
  • the pulp suspension is already heated in the screw press 1 and not only in the crystallizer 11, the temperature and pressure of the heating steam can be adjusted independently of the required conditions in the crystallizer 11 boundary conditions.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un procédé pour charger en carbonate de calcium une suspension de matière fibreuse comprenant des fibres de cellulose. Ce procédé consiste à introduire de l'hydroxyde de calcium sous forme liquide ou sèche ou de l'oxyde de calcium dans la suspension de matière fibreuse, à déshydrater la suspension de matière fibreuse jusqu'à obtention d'une suspension de matière fibreuse qui n'est plus liquide, mais qui est encore humide, à comprimer cette suspension de matière fibreuse au moins partiellement dans une vis sans fin (1), à introduire du dioxyde de carbone gazeux dans la suspension de matière fibreuse humide, puis à faire précipiter le carbonate de calcium par le dioxyde de carbone. Cette invention est caractérisée en ce que la suspension de matière fibreuse est chauffée par de la vapeur dans la zone de la vis sans fin (1).
PCT/EP2006/001587 2005-03-17 2006-02-22 Procede et dispositif pour charger en matiere de charge des fibres contenues dans une suspension de matiere fibreuse WO2006097180A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510012168 DE102005012168A1 (de) 2005-03-17 2005-03-17 Verfahren und Vorrichtung zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit Füllstoff
DE102005012168.3 2005-03-17

Publications (1)

Publication Number Publication Date
WO2006097180A1 true WO2006097180A1 (fr) 2006-09-21

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DE (1) DE102005012168A1 (fr)
WO (1) WO2006097180A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009056177A1 (fr) * 2007-10-30 2009-05-07 Voith Patent Gmbh Procédé pour former du carbonate de calcium dans une suspension fibreuse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028539A1 (de) * 2007-06-21 2008-12-24 Voith Patent Gmbh Verfahren zum Bilden von Calciumcarbonat in einer Faserstoffsuspension

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002788A1 (fr) * 1982-02-16 1983-08-18 Klinga, Leif Appareil et procede de production d'une pulpe fibreuse a partir de materiaux contenant de la lignocellulose fibreuse
US5176793A (en) * 1988-08-30 1993-01-05 Cellwood Machinery Ab Method of treating and a disperger for disintegrating wood pulp, especially containing waste paper
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
WO1996018769A1 (fr) * 1994-12-14 1996-06-20 Kvaerner Hymac A.S. Dispositif de traitement d'une masse particulaire
US6250573B1 (en) * 1997-03-26 2001-06-26 Voith Sulzer Papiertechnik Patent Gmbh Process and device for the dispersion of a fibrous paper material
DE10219843C1 (de) * 2002-05-03 2003-08-21 Voith Paper Patent Gmbh Verfahren zur Dispergierung eines Papierfaserstoffes
US20040112557A1 (en) * 2001-05-16 2004-06-17 Weyerhaeuser Company Refiner bleaching with magnesium oxide and hydrogen peroxide
DE10317722A1 (de) * 2003-04-17 2004-11-11 Voith Paper Patent Gmbh Verfahren zum Beladen einer Faserstoffsuspension mit Kalziumkarbonat und Anordnung zur Durchführung des Verfahrens

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002788A1 (fr) * 1982-02-16 1983-08-18 Klinga, Leif Appareil et procede de production d'une pulpe fibreuse a partir de materiaux contenant de la lignocellulose fibreuse
US5176793A (en) * 1988-08-30 1993-01-05 Cellwood Machinery Ab Method of treating and a disperger for disintegrating wood pulp, especially containing waste paper
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
WO1996018769A1 (fr) * 1994-12-14 1996-06-20 Kvaerner Hymac A.S. Dispositif de traitement d'une masse particulaire
US6250573B1 (en) * 1997-03-26 2001-06-26 Voith Sulzer Papiertechnik Patent Gmbh Process and device for the dispersion of a fibrous paper material
US20040112557A1 (en) * 2001-05-16 2004-06-17 Weyerhaeuser Company Refiner bleaching with magnesium oxide and hydrogen peroxide
DE10219843C1 (de) * 2002-05-03 2003-08-21 Voith Paper Patent Gmbh Verfahren zur Dispergierung eines Papierfaserstoffes
DE10317722A1 (de) * 2003-04-17 2004-11-11 Voith Paper Patent Gmbh Verfahren zum Beladen einer Faserstoffsuspension mit Kalziumkarbonat und Anordnung zur Durchführung des Verfahrens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009056177A1 (fr) * 2007-10-30 2009-05-07 Voith Patent Gmbh Procédé pour former du carbonate de calcium dans une suspension fibreuse

Also Published As

Publication number Publication date
DE102005012168A1 (de) 2006-09-28

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