WO2010079263A2 - Raffineur et procédé de raffinage de pâte à papier - Google Patents

Raffineur et procédé de raffinage de pâte à papier Download PDF

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Publication number
WO2010079263A2
WO2010079263A2 PCT/FI2010/050009 FI2010050009W WO2010079263A2 WO 2010079263 A2 WO2010079263 A2 WO 2010079263A2 FI 2010050009 W FI2010050009 W FI 2010050009W WO 2010079263 A2 WO2010079263 A2 WO 2010079263A2
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
refining
stator
pulp
refiner
Prior art date
Application number
PCT/FI2010/050009
Other languages
English (en)
Other versions
WO2010079263A3 (fr
Inventor
Timo Koskinen
Kari Edelman
Helmer Gustafsson
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
Publication of WO2010079263A2 publication Critical patent/WO2010079263A2/fr
Publication of WO2010079263A3 publication Critical patent/WO2010079263A3/fr

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs
    • 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
    • D21B1/14—Disintegrating in mills
    • 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
    • D21B1/14—Disintegrating in mills
    • D21B1/26—Driving or feeding arrangements
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/22—Jordans
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/34—Other mills or refiners
    • D21D1/38—Other mills or refiners with horizontal shaft

Definitions

  • the invention relates to a refiner which is of the type presented in the preamble of the appended claim 1.
  • the invention further relates to a method for refining pulp.
  • the field of invention is the manufacture of mechanical pulp from a wood-based raw material.
  • Mechanical pulp is manufactured industrially by grinding or refining wood raw material.
  • whole trees are pressed against a rotating cylindrical surface, whose surface structure is formed to detach fibres from a tree.
  • the obtained pulp is discharged with shower water from the grinder to fractionation, and the reject is ground with a disc refiner.
  • This method produces pulp that contains short fibres and scatters light well.
  • a typical example to be mentioned of a grinding process is US patent 4,381 ,217.
  • the starting material consists of wood chips which are directed to the centre of a disc refiner, from where they are transferred by the effect of a centrifugal force and a steam flow to the circumference of the refiner while being disintegrated by the blades at the surface of the disc.
  • High energy consumption is characteristic to both methods of manufacturing mechanical pulp.
  • the energy consumption for LWC paper pulp is about 2 MWh/ton, and ( in addition, because of the short fibres, chemical pulp fibres are needed for strengthening the structure in order to achieve sufficient runnability of a paper web.
  • the typical energy consumption for LWC paper pulp is about 3 MWh/ton. Because of the long fibres of the product obtained with this method, it is not necessary to strengthen the structure of the paper with chemical pulp.
  • the present invention relates precisely to a refiner mechanical pulp manufacturing process, in which the fibre raw material fed to the process is in the form of particles, for example wood chips or similar, and it is refined by bringing it into a blade gap where the mechanical working of the moving surfaces refines it and detaches fibres from it.
  • This kind of a process is typically implemented by high-consistency refining (HC refining) in the above- described disc refiner, between two refiner disc with profiled surfaces, where the pulp to be refined and the steam generated are carried outwards in the radial direction of the discs.
  • HC refining high-consistency refining
  • Such a refiner has a small blade gap, about 0.2 mm at the smallest.
  • Another refiner type is the conical refiner, in which the fibre raw material is fed into a refining zone formed by a conical rotating rotor and a stator surrounding the rotor, in which zone it is refined to pulp.
  • This process is carried out in the form of low consistency pulp processing at the consistency of about 4%, wherein the blade gap is also very small, close to a blade contact.
  • the refining is based on the fact that in such a small blade gap, the fibre is flattened and the blade gap is lubricated by water that is amply present. This kind of processing is not suitable for refining in the first step.
  • the refiner according to the invention is primarily characterized in what will be presented in the characterizing part of the appended claim 1.
  • the refining zone is between a rotor arranged to rotate around an axis and a stator surrounding the rotor, wherein the high-consistency pulp can be directed to the blade gap, thanks to the centrifugal force generated by the rotor.
  • the blade gap is larger than conventionally, about 0.5 to 5 mm, advantageously about 1 to 3 mm, and its opposite surfaces (the refining surface of the rotor blade and the inner surface of the stator) has a sufficient roughness/fine toothing to generate a sufficient friction with the pulp therebetween. In this way, shearing forces are generated in the pulp, and the fibres are also rubbed against each other in the blade gap.
  • the pulp In the annular refining zone, the pulp is conveyed in the axial direction, that is, in the direction of the rotating axis of the rotor, from the feeding end to the discharging end, all the time subjected to said phenomena. Refining energy can be directed to the pulp at a good efficiency.
  • Fig. 1 shows a refiner according to the invention in a longitudinal section in the direction of the rotor axis
  • Fig. 2 shows the rotor of the refiner seen from the front
  • Fig. 3 shows the surfaces of the rotor and the stator of the refiner in a detailed view in a section perpendicular to the rotor axis
  • Fig. 4 shows an example of a rotor blade in a top view.
  • Figure 1 shows a refiner according to the invention, comprising a rotor R arranged rotatable around an axis A and rotating inside a stator S. Between the rotor and the stator, an annular space is formed, in which refining takes place at the same time when the pulp to be refined advances in the direction of the rotation axis of the rotor.
  • said space expands in the direction of feeding the raw material, or the direction of flow of the pulp, wherein the refiner in question is a conical refiner with a conical rotor.
  • said annular space has a constant diameter, wherein it is a cylindrical refiner with a cylindrical rotor R.
  • Wood-based raw material consisting of wood chips or pulp that has already been partly refined, is fed in the direction of the arrow to the first end of the rotor, that is, to the initial end of the refining zone, for example with a feed screw 1.
  • a feed screw 1 At the initial end of the refining space between the rotor and the stator, there are crushing teeth 2 attached to the rotor, having the function of crushing the fed wood chips before they enter the actual refining space where they are refined to fibres.
  • the chips to be refined pass the refining space between the rotor and the stator in the axial direction with a given retention time, after which they are taken out of the refiner as refined pulp.
  • the retention time is longer than in conventional disc refiners, in which the centrifugal force rather carries the pulp away and cannot press it to the refining zone.
  • the refining is high-consistency pulp refining, in which the consistency of the pulp is at least 10%, advantageously at least 18%.
  • the consistency may be at least 30%, for example in the order of 50%.
  • the consistency is adjusted by supplying a suitable quantity of water with the wood raw material entering the refiner, for example into the feed screw 1.
  • Figure 2 shows the rotor of the refiner seen from the front, that is, from the direction of the first end (initial end of the refining zone).
  • the rotor of the refiner typically comprises axially directed blades 3 spaced at certain intervals on its circumference, passages 4 being formed between them, the bottom of the passages being the body of the rotor R. Because the thermal energy generated in high-consistency refining converts water present in the pulp into steam, the passages 4 extending in the axial direction from the feeding end to the discharging end constitute a means to guide the steam out of the refining zone. Said blades 3 and passages 4 extend at an angle outwards according to the conicality of the rotor R.
  • the height of the blades 3 from the body of the rotor R that is, the depth of the passages 4, may be in the order of a few millimetres, for example 5 to 15 mm, advantageously about 10 mm.
  • the passages 4 of the rotor R typically and preferably have no obstacles or "dams" known from low-consistency refining, but the passages formed by them are open from the initial end (feeding end) of the rotor to the terminal end (discharging end) of the rotor, so that the steam generated during the refining can flow without obstacles to the terminal end of the rotor and out of the refining zone.
  • refining energy is directed to the mechanical processing of the pulp in the refining space, and the generation of steam from the water in the pulp is minimized, because it takes energy.
  • FIG. 3 shows the refining space 5 between the rotor R and the stator S in a larger scale.
  • a so-called blade clearance d is formed, which is in this case larger than in low-consistency refining, that is, in the order of 0.5 to 5 mm, advantageously 1 to 3 mm.
  • the blade clearance can be easily adjusted by changing the position of the rotor in the axial direction. Because of the centrifugal force effective in the refining, the fibre material M to be refined is against the inner wall of the stator S, and it moves, being continuously ground against the wall of the stator, in the axial direction towards the discharging end.
  • the fibres are not entrained in the movement of the rotor R but rub against each other also in the blade gap.
  • the steam generated in refining is allowed to pass freely in the radial direction inwards in the refining space, from the pulp compressed against the inner wall of the rotor into the passages 4 and further away in the axial direction, along the bottoms of the passages 4.
  • stator friction properties it may be provided with zones of a given width distributed on the circumference, having a fine toothing or a surface that is otherwise rougher than the smooth surface of the stator. This can be achieved by techniques of metal machining or surface treatment. A rougher surface can be provided by attaching, for example, hard particles (grits) to the surface. If these zones are oriented directly in the axial direction, their fine toothing (alternating grooves and elevations) may be in parallel or at an angle with the ⁇ axial direction (for example, at an angle of 45 degrees at the maximum), to give a forward transferring effect in addition to the refining effect.
  • the zones may protrude slightly from the smooth surface of the rotor, for example at a maximum of 3 mm, advantageously 1 to 1.5 mm. If the roughness of the zones has no orienting property as such, these rougher surfaces may extend at an angle to the axial direction, for example at an angle of 45 degrees at the maximum, so that they can also have a forward transferring effect.
  • the width of said zones of the stator in the direction of the circumference is, for example, 15 to 30 mm, and their spacing in the direction of the circumference may be 15 to 30 mm.
  • Figure 3 shows a blade gap formed momentarily between a blade 3 of the rotor R and the toothed zone of the inner surface of the stator S. It is obvious that when the rotor is rotating, the blades 3 come by such zones and the smoother sections of the rotor in an alternating manner.
  • stator with said friction-increasing surface on the whole circumference, but experience has shown that a better result is obtained by the alternation of zones with varying friction properties (smooth - fine toothed or containing particles embedded in the surface).
  • Figure 3 shows that a fine toothing may be provided at the outer surface 3a of the rotor blade as well, wherein the grooves/elevations may extend in parallel with the blade or at an angle of 45 degrees, at the maximum, to that, as shown in Fig. 4. Also this has a directing effect, thanks to the rotation of the rotor R, for example in the case that the zones on the inner surface of the stator are equipped with axial grooves, or the inner surface of the stator comprises zones that are otherwise rougher and extend in the axial direction. Also, the roughness of the refining surfaces 3a of the rotor blades can be achieved with suitable techniques of metal machining or surface treatment, for example by attaching hard particles (grits) to it.
  • suitable techniques of metal machining or surface treatment for example by attaching hard particles (grits) to it.
  • the refiner used in the invention is advantageously a conical refiner, because it has the possibility of adjusting the blade gap easily, and furthermore, the risk of blade contact is small, because the axial forces are smaller than in disc refiners.
  • the cone angle of the rotor (the angle of the surface to the rotation axis A) is, for example, 10 to 30 degrees, advantageously 15 to 25 degrees, but these numerical values should not be considered limiting.
  • the invention also encompasses a cylindrical refiner.
  • the refining surfaces of the rotor blades may be spaced at a constant distance from the surface of the stator, or they may also open slightly in the advancing and/or trailing directions.
  • the above-defined blade gap is thus the minimum distance between the refining surface and the stator surface.
  • the invention is particularly intended for refining in the first step, wherein the wood raw material to be fed consists of wood chips, but it may also be applied in high-consistency pulp refining in the second step, for processing pulp that has already been refined once.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un raffineur comprenant un rotor (R) disposé rotatif autour d'un axe à l'intérieur d'un stator (S), et des pales agencées sur la périphérie du rotor opposées au stator. Un espace de raffinage annulaire est formé entre le rotor et le stator, s'étend dans la direction axiale et présente un jeu entre les pales et la surface intérieure du stator (S). Les moyens d'alimentation (1) du raffineur sont agencés pour alimenter l'espace de raffinage en pâte à papier à consistance élevée. Le jeu entre les pales est de 0,5 à 5 mm, et avantageusement de 1 à 3 mm.
PCT/FI2010/050009 2009-01-08 2010-01-08 Raffineur et procédé de raffinage de pâte à papier WO2010079263A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20095009A FI121816B (fi) 2009-01-08 2009-01-08 Jauhin ja menetelmä massan jauhamiseksi
FI20095009 2009-01-08

Publications (2)

Publication Number Publication Date
WO2010079263A2 true WO2010079263A2 (fr) 2010-07-15
WO2010079263A3 WO2010079263A3 (fr) 2010-08-26

Family

ID=40329467

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2010/050009 WO2010079263A2 (fr) 2009-01-08 2010-01-08 Raffineur et procédé de raffinage de pâte à papier

Country Status (2)

Country Link
FI (1) FI121816B (fr)
WO (1) WO2010079263A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140083634A1 (en) * 2010-12-31 2014-03-27 Upm-Kymmene Corporation Method and an apparatus for producing nanocellulose
CN115198550A (zh) * 2022-06-06 2022-10-18 江苏博汇纸业有限公司 一种用于纸张生产用化学浆料的锥形磨浆机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381217A (en) 1980-11-18 1983-04-26 Oy. Tampella Ab Method of increasing the temperature of shower water used in a wood grinding process
US4421595A (en) 1979-01-12 1983-12-20 Yhtyneet Paperitehtaat Oy Jylhavaara Process for preparing thermomechanical pulp with heat recovery
WO1998050623A1 (fr) 1997-05-05 1998-11-12 Sunds Defibrator Industries Ab Appareil d'alimentation et de raffinage de matiere lignocellulosique
US7237733B2 (en) 2002-11-18 2007-07-03 M-Real Oyj Method and apparatus for producing mechanical fibers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327952A (en) * 1964-08-01 1967-06-27 West Virginia Pulp & Paper Co Method for the preparation of fibrous materials for the production of paper and cardboard
US3661328A (en) * 1970-03-30 1972-05-09 Bauer Bros Co Pulp refining system and process
US5200038A (en) * 1985-08-28 1993-04-06 International Paper Company Pulp refiner with fluidizing inlet
DE19541892C1 (de) * 1995-11-10 1996-11-21 Voith Sulzer Stoffaufbereitung Vorrichtung zur mechanischen Behandlung von hochkonsistentem Faserstoff
AT408768B (de) * 2000-02-03 2002-03-25 Andritz Ag Maschf Refiner zur zerkleinerung von faserstoffen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4421595A (en) 1979-01-12 1983-12-20 Yhtyneet Paperitehtaat Oy Jylhavaara Process for preparing thermomechanical pulp with heat recovery
US4381217A (en) 1980-11-18 1983-04-26 Oy. Tampella Ab Method of increasing the temperature of shower water used in a wood grinding process
WO1998050623A1 (fr) 1997-05-05 1998-11-12 Sunds Defibrator Industries Ab Appareil d'alimentation et de raffinage de matiere lignocellulosique
US7237733B2 (en) 2002-11-18 2007-07-03 M-Real Oyj Method and apparatus for producing mechanical fibers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140083634A1 (en) * 2010-12-31 2014-03-27 Upm-Kymmene Corporation Method and an apparatus for producing nanocellulose
US8945346B2 (en) * 2010-12-31 2015-02-03 Upm-Kymmene Corporation Method and an apparatus for producing nanocellulose
CN115198550A (zh) * 2022-06-06 2022-10-18 江苏博汇纸业有限公司 一种用于纸张生产用化学浆料的锥形磨浆机

Also Published As

Publication number Publication date
FI20095009A0 (fi) 2009-01-08
FI20095009A (fi) 2010-08-04
FI121816B (fi) 2011-04-29
WO2010079263A3 (fr) 2010-08-26

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