EP1334230B1 - Method and apparatus and screen for screening mechanical fibre pulp - Google Patents

Method and apparatus and screen for screening mechanical fibre pulp Download PDF

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Publication number
EP1334230B1
EP1334230B1 EP01978484A EP01978484A EP1334230B1 EP 1334230 B1 EP1334230 B1 EP 1334230B1 EP 01978484 A EP01978484 A EP 01978484A EP 01978484 A EP01978484 A EP 01978484A EP 1334230 B1 EP1334230 B1 EP 1334230B1
Authority
EP
European Patent Office
Prior art keywords
gap
screen
fibre pulp
fibres
pulp mixture
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.)
Expired - Lifetime
Application number
EP01978484A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1334230A1 (en
Inventor
Jouko Hautala
Vesa Juutinen
Erkka Nieminen
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1334230A1 publication Critical patent/EP1334230A1/en
Application granted granted Critical
Publication of EP1334230B1 publication Critical patent/EP1334230B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp

Definitions

  • the invention relates to a method and an apparatus for screening a mechanically manufactured fibre pulp mixture containing fibres of varying lengths comprising the features summarized in the preambles of claims 1 and 6, respectively.
  • the invention further relates to a gap screen for screening a mechanically manufactured fibre pulp mixture containing fibres of varying lengths comprising the features summarized in the preamble of claim 14.
  • the fibre material is screened in the prior art methods using screens comprising various screening surfaces so that fibres, which are smaller than a particular size and which have passed through a screening surface, are directed for use, and the coarser fibres are removed from the process and returned again to the process through reject refining.
  • the final result is a fibre pulp mixture, where the lengths of the fibres and thus their freeness values vary widely, and the structure of the fibre pulp mixture and the properties thereof do not correspond with the desired ones.
  • Document WO 97 32079 A1 discloses a method and an apparatus for the recovery of fibres from a fibre pulp mixture containing fibres of varying lengths, contaminants and a liquid carrier. Moreover, this document discloses a gap screen for screening a fibre pulp mixture containing fibres of varying lengths, contaminants and a liquid carrier.
  • the method and apparatus as well as the gap screen according to document WO 97 32079 A1 comprise the features summarized in the preambles of claims 1, 6 and 14, respectively, except that this document does not explicitly disclose that the fibre pulp mixture is obtained by mechanically defibering wood in the presence of water.
  • the gap screen according to this document is formed as a drum washer, and the convergent gap is formed between the upper surface of a vat and a rotatable drum the surface of which is formed by a wire.
  • this object is achieved by the method defined in claim 1, the apparatus defined in claim 6 and the gap screen defined in claim 14.
  • An essential idea of the invention is that an extremely fine and short-fibred fibre pulp material is separated from the fibre pulp mixture using the gap screen formed by means of twin wires, whereby a very short-fibred material having a high Bauer McNett value is obtained that cannot be so distinctly distinguished as a specific pulp by means of other screening methods.
  • a part of a fibre pulp mixture containing medium-length and shorter fibre materials preferably already screened by separating long fibres therefrom is screened anew using said gap screen formed by means of twin wires.
  • the medium-sized fibre material containing some fine fibres exiting from the gap screen is directed further to be refined. As a result a fraction containing medium-sized and short fibres with the desired properties is obtained.
  • the invention provides such an advantage that a fibre fraction that is shorter than a fraction representing a particular length can be very accurately separated from the fibre pulp mixture containing fibres of varying lengths.
  • An advantage provided by a preferred embodiment of the invention is that as the long-fibred fibre material is at first screened and thereafter a very short fibre material having a high freeness value is separated using the gap screen from the remaining fraction containing medium-sized and short-fibred material, then the final result is that three fibre pulp fractions with different properties are obtained that can be mixed with one another or with other fibre materials in order to achieve a desired fibre web quality.
  • long fibres can be combined with very short fibres in order to obtain a particular paper quality, which is not possible when medium-sized fibres are included in the fibre pulp.
  • fibre pulp fractions of varying properties and lengths can be obtained as desired from the mechanically manufactured fibre pulp, and thereby the desired fractions can easily be combined with the manufacturing of fibre web, and only the fibre pulp fractions required can be used to produce a particular type of fibre web.
  • a fibre web that contains only long or short fibres can be manufactured and the medium-sized fibre obtained can be used to produce another type of fibre web.
  • Figure 1 schematically shows the method and apparatus of the invention, in which Bauer McNett values of a particular fibre pulp are provided by way of example, on the basis of which values the division into different fibre pulp fractions can be carried out.
  • Figure 1 schematically shows how a material 1 to be defibered is directed to a defibrator 2, which may be a grinder known per se or a refiner, typically a thermomechanical pulp refiner.
  • the fibre pulp mixture obtained from defibration is directed to screening means, at first to a first screen 3, where the mixture can be divided for example in accordance with Bauer McNett value "16" so that the fraction containing long fibres and having passed through the first screen 3 proceeds to be further processed and the fraction containing even longer fibres and shives and having not passed through said screen is directed to be refined to a first recirculation refiner 4, from where the fraction is returned to the first screen 3 for screening.
  • a defibrator 2 which may be a grinder known per se or a refiner, typically a thermomechanical pulp refiner.
  • the fibre pulp mixture obtained from defibration is directed to screening means, at first to a first screen 3, where the mixture can be divided for example in accordance with Bauer McNett value "16" so that
  • the first refiner may either be a separate refiner, or the fraction to be returned can also be returned to the actual defibrator 2 as indicted by the dashed line.
  • the fibre pulp fraction containing long fibres and having passed through the first screen is directed forward to a second screen 5, where the fraction is screened again according to length on the basis of the fibre length provided by way of example with Bauer McNett value "28".
  • the fibre pulp fraction that has passed through the second screen 5 continues forward to be further processed and the longer fibre pulp fraction that is unable to pass through said screen is directed to a second refiner 6, which is preferably a refiner known per se.
  • the fibre pulp obtained from the second refiner 6 is directed to a third screen 7, from where the fibre that is shorter than a particular length and that has passed through said screen, for example a fibre provided with Bauer McNett value "40" is directed forward for use, and correspondingly the fibre that is unable to pass through the screen 7 is returned again to the second refiner 6 to be refined.
  • the long fibre circulates the same loop until it is shortened to a desired size in such a manner that it passes through the third screen 7 and is then ready for use.
  • the fibre pulp fraction that has passed through the second screen 5 is directed to a fine screening, where a fine fibre pulp fraction is separated from the fibre pulp using a separate gap screen 10, for example fibres provided with a Bauer McNett value of at least "200" and correspondingly fibres that are longer than that are directed to a third refiner 9, which preferably is a refiner known per se.
  • the fibre pulp fraction obtained from the output of the third refiner 9 contains high-quality fines and medium-sized material.
  • the gap screen 10 is a twin wire structured screen. Such a screen can be used to efficiently remove a desired amount of fibre pulp of a particular length or shorter than that from the fibre pulp mixture, thus making the division between the fractions drastic and providing a desired ratio.
  • the other screens are screens known as such either so that each screen represents a separate individual screen or that two or more screens form one multi-phase screen. Then again it is necessary to use a gap screen to separate short fibres.
  • FIG. 2 schematically shows a twin wire structured gap screen 10.
  • the gap screen allows to screen the fibre pulp into two fractions.
  • the gap screen comprises two movable wires 11 and 12 forming opposing screening surfaces that move through the gap screen and return as closed loops so as to form a convergent gap 13 within the gap screen in the direction of movement thereof.
  • Supporting structures 14 and 15 are placed at the back of the wires 11 and 12, i.e. on the opposite side of the gap 13.
  • the wires 11 and 12 are supported against the supporting structures 14 and 15, which naturally include openings for receiving water and the fine fibre material removed through the openings of the wires 11 and 12 and removing the same from the gap screen as schematically shown by arrows A.
  • the wires 11 and 12 circulate around rollers 16 and 17 shown by way of example, which as such is known in the art.
  • the sides of the gap 13 at the edges of the wires 11 and 12 are naturally dosed, so that the fibre pulp mixture can be fed from a feeding channel 18 to the gap screen appropriately under pressure so as to remove the water and fine fibre material as desired.
  • engines 19 and 20 which are connected to rotate one of the rollers 16, and 17 respectively, although in a normal situation the engines can be used to circulate each roller separately or a required amount of the rollers in a manner known as such in the art.
  • the engines 19 and 20 are, in turn, connected to a control unit 21 included in the control means that allows to adjust, for example, the rotational speed of the engines so as to make the wires 11 and 12 move at a desired pace, which may deviate from the flowing rate of the fibre pulp through the screen and most preferably exceeds the flowing rate of the fibre pulp mixture.
  • the fibre pulp mixture is fed from the feeding channel 18 to the gap screen, and the mixture thus flows through the gap 13 of the screen and exits from a narrower output port 22 of the gap 13, i.e. the smaller output port in cross section as regards the feeding opening, from the same side of the screening surfaces or the wires, to which the fibre pulp mixture was originally fed.
  • a narrower output port 22 of the gap 13 i.e. the smaller output port in cross section as regards the feeding opening
  • water is removed from the openings in the wires as well as short fibre material.
  • the speed of motion in the wires can be adjusted in relation to the feeding rate of the fibre pulp mixture fed into the gap screen until the desired screening result is obtained.
  • the output port 22 refers to that part in the gap screen, where water and fibres are no longer removed through the wires and the remaining fibre pulp mixture is transferred from the screening phase to the following possible processing phases either directly or controlled by various conveyor means and control means such as wires and the like.
  • What can naturally also affect the quality of the fraction is to appropriately select the dimensioning and penetration of the wires 11 and 12, whereby wires provided with different penetration properties can be used for different purposes.
  • What can also affect the screening is to set one or both of the wires to move towards the gap along a convex supporting structure, in which case water and the fine fibres are at the same time removed more efficiently from the fibre pulp fraction at the feeding end of the gap screen, and correspondingly more slowly towards the output end of the gap screen.
  • the adjustment of the screening is mainly based on the fact that the gap screen adjusts the basis weight of the fibre pulp mixture including the long-fibred fibre material that flows through said gap screen.
  • This can be implemented either by adjusting the consistency of the fibre pulp mixture to be fed into the screening or the velocity of the wires in relation to the feeding rate of the fibre pulp mixture.
  • a diluted fibre pulp mixture is fed into the gap screen, more short fibres can be removed from the fibre pulp mixture than if a more consistent fibre pulp mixture is fed under similar circumstances.
  • the velocity of the wires is increased in relation to the feeding rate of the fibre pulp mixture, then more short fibres can correspondingly be removed from the fibre pulp mixture.
  • the separation value of the short fibres can be set at a desired level by adjusting the consistency of the feed and/or the velocity of the wires, so that the result obtained is distinctly different fibre pulp fractions, where the fraction that passes through the wires contains only very short fibres and correspondingly the fraction that flows through the gap of the gap screen contains longer fibres but very few short fibres.
  • the velocity of the wires can be adjusted in various ways, so that it remains below the feeding rate of the fibre pulp, exceeds the feeding rate of the fibre pulp or equals the feeding rate of the fibre pulp. The choice of velocity is based on the properties of the fibre pulp mixture to be screened and on the desired screening result.
  • Figure 3 schematically shows the result of the screening obtained by means of a gap screen shown in Figure 1 in accordance with the method of the invention.
  • Figure 3 shows the screening result, or the portion of the fibres having different Bauer McNett values, in the fibre pulp mixture fed and correspondingly in the fraction that passes through the gap and exits through the output end of the gap screen.
  • the portions of the fibres having different freeness values are presented in such a manner that each portion of different fibres in the fibre pulp mixture fed of the entire fibre pulp mixture is indicated by a black column and correspondingly each portion of fibres having a corresponding freeness value included in the fibre pulp fraction that exits through the output end is indicated by a white column.
  • the fibre pulp that has completed the screening shows that the portion of coarse fibres has risen proportionally by nearly 50%, the portion of the following fibres approximately 25%, whereas the portion of the shorter fibres has increased only slightly.
  • the extremely short fibres have, in turn, been removed to a great extent through the wires with the water, and the portion of the short fibres has therefore decreased proportionally by 60%.
  • the extremely short fibres can efficiently be removed from the fibre pulp mixture to be screened, and thus a specific fibre pulp fraction can be obtained that can be used for various purposes by mixing a desired amount thereof to the long fibres for example, in order to manufacture a particular type of fibre web provided with specific properties.
  • the average freeness value of the fibre pulp mixture that passes through the gap screen has increased.
  • Figure 3 shows that the amount of long fibres in the fraction that passes through the wires is substantially 0 and correspondingly the amount of short fibres in the long-fibred fraction that passes through the gap screen is very low. This indicates that the gap screen operates fairly efficiently and divides the fibre pulp mixture drastically into two fractions of distinctly varying lengths.
  • An appropriate selection of wire structures in the gap screen allows to determine the applicable screening conditions for the fibres of varying lengths in accordance with use and to adjust the efficiency of the screening by controlling the velocity and/or the consistency of the fibre pulp mixture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Preliminary Treatment Of Fibers (AREA)
EP01978484A 2000-10-16 2001-10-16 Method and apparatus and screen for screening mechanical fibre pulp Expired - Lifetime EP1334230B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20002283 2000-10-16
FI20002283A FI110619B (fi) 2000-10-16 2000-10-16 Menetelmä ja laitteisto sekä lajitin mekaanisen kuitumassan lajittelemiseksi
PCT/FI2001/000896 WO2002033165A1 (en) 2000-10-16 2001-10-16 Method and apparatus and screen for screening mechanical fibre pulp

Publications (2)

Publication Number Publication Date
EP1334230A1 EP1334230A1 (en) 2003-08-13
EP1334230B1 true EP1334230B1 (en) 2006-08-30

Family

ID=8559306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01978484A Expired - Lifetime EP1334230B1 (en) 2000-10-16 2001-10-16 Method and apparatus and screen for screening mechanical fibre pulp

Country Status (14)

Country Link
US (1) US20040011483A1 (pt)
EP (1) EP1334230B1 (pt)
JP (1) JP2004511676A (pt)
CN (1) CN1280477C (pt)
AT (1) ATE338159T1 (pt)
AU (2) AU1059602A (pt)
BR (1) BR0114591A (pt)
CA (1) CA2425511A1 (pt)
DE (1) DE60122766T2 (pt)
ES (1) ES2269473T3 (pt)
FI (1) FI110619B (pt)
NO (1) NO20031662D0 (pt)
NZ (1) NZ524942A (pt)
WO (1) WO2002033165A1 (pt)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0413068D0 (en) * 2004-06-11 2004-07-14 Imerys Minerals Ltd Treatment of pulp
SE533736C2 (sv) * 2009-03-19 2010-12-21 Metso Paper Inc Anordning, system och metod för behandling av cellulosamassa
FR2995325B1 (fr) * 2012-09-11 2015-03-13 Ct Tech De L Ind Des Papiers Cartons Et Celluloses Procede de fabrication d'un support fibreux multicouche par fractionnement et stratification
US10941520B2 (en) 2015-08-21 2021-03-09 Pulmac Systems International, Inc. Fractionating and refining system for engineering fibers to improve paper production
US10041209B1 (en) 2015-08-21 2018-08-07 Pulmac Systems International, Inc. System for engineering fibers to improve paper production
US11214925B2 (en) 2015-08-21 2022-01-04 Pulmac Systems International, Inc. Method of preparing recycled cellulosic fibers to improve paper production
CN115418878A (zh) * 2022-08-17 2022-12-02 中集竹链科技有限公司 物料筛分系统及筛分方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228954A (en) * 1991-05-28 1993-07-20 The Procter & Gamble Cellulose Company Cellulose pulps of selected morphology for improved paper strength potential
US5405499A (en) * 1993-06-24 1995-04-11 The Procter & Gamble Company Cellulose pulps having improved softness potential
WO1997032079A1 (en) * 1996-02-28 1997-09-04 Alfa Laval Ab Improved recovery of fine fibers from suspensions containing fibers and contaminants
US5916417A (en) * 1997-08-22 1999-06-29 International Paper Company Method of making multi-ply paperboard sheet having layers of different fiber properties
FI108152B (fi) * 1999-07-22 2001-11-30 Metso Paper Inc Menetelmä ja laitteisto kuitumassaseoksen pesemiseksi

Also Published As

Publication number Publication date
FI20002283A0 (fi) 2000-10-16
AU1059602A (en) 2002-04-29
ES2269473T3 (es) 2007-04-01
EP1334230A1 (en) 2003-08-13
BR0114591A (pt) 2003-10-14
CN1553979A (zh) 2004-12-08
FI110619B (fi) 2003-02-28
WO2002033165A1 (en) 2002-04-25
NO20031662L (no) 2003-04-10
JP2004511676A (ja) 2004-04-15
DE60122766D1 (de) 2006-10-12
DE60122766T2 (de) 2007-08-30
ATE338159T1 (de) 2006-09-15
US20040011483A1 (en) 2004-01-22
CA2425511A1 (en) 2002-04-25
AU2002210596B2 (en) 2006-05-18
FI20002283A (fi) 2002-04-17
NZ524942A (en) 2004-12-24
CN1280477C (zh) 2006-10-18
AU2002210596C1 (en) 2006-09-28
NO20031662D0 (no) 2003-04-10

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