WO1993023609A1 - Procede et appareil d'epuration de suspension de pate a papier - Google Patents

Procede et appareil d'epuration de suspension de pate a papier Download PDF

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Publication number
WO1993023609A1
WO1993023609A1 PCT/FI1993/000213 FI9300213W WO9323609A1 WO 1993023609 A1 WO1993023609 A1 WO 1993023609A1 FI 9300213 W FI9300213 W FI 9300213W WO 9323609 A1 WO9323609 A1 WO 9323609A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
rotor
dilution water
screening
pipes
Prior art date
Application number
PCT/FI1993/000213
Other languages
English (en)
Inventor
Paul Olof Meinander
Original Assignee
Pom Technology Oy Ab
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 Pom Technology Oy Ab filed Critical Pom Technology Oy Ab
Publication of WO1993023609A1 publication Critical patent/WO1993023609A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
    • B01D29/118—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration open-ended
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B01D29/6446—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/78—Handling the filter cake in the filter for purposes other than for regenerating for washing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/86—Retarding cake deposition on the filter during the filtration period, e.g. using stirrers
    • 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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the present invention relates to a pressurized screen and a process for scree ⁇ ning a pulp suspension in a pressurized screen.
  • the invention also relates to the use of said screen in a paper machine short circulation.
  • the invention relates principally to the removal of impurities from fibre slurries used in the pulp and paper industries.
  • the invention presents a further development of commonly used pressurized screens, by which the loss of good material together with rejects is minimized so that the cleaning process becomes more efficient, compact and energy efficient.
  • the temporary hold of fibres at the screen plate also makes the liquid compo ⁇ nent of the suspension pass the screen faster than the fibres, which causes the suspension to be screened to become gradually more concentrated in the screening zone. This again gradually decreases the functionality of the scree ⁇ ning, until the screening has to be interrupted in order to prevent excessive concentration and a resulting clogging of the screen.
  • Removing the fraction not passing the screen, i.e. the reject, from the screen also requires a sufficient volume flow so that the flow speed in reject pipes can be kept sufficiently high, and the separation of solids and consequent clogging of the piping can be avoided.
  • the multistage screening is obviously disadvantageous regarding need for space, investment, energy consumption, cleanliness and also otherwise regar ⁇ ding controllability.
  • FI Patent 70059 and FI Patent 70614 present solutions, whereby dilution water is fed into a screening zone through the screen rotor. Both these solu ⁇ tions entail complicated mechanisms for the distribution of dilution water, and the risk for build up of dirt and slime. Such problems are mentioned in the dis ⁇ closure of US Patent 3,437,204, and are obvious if operated with paper machine backwater. These screens are thus not suited for the use in a paper machine wet end.
  • Copending Patent Application FI 922285 by the present inventor provides a novel solution to the problems regarding controllability and cleanli ⁇ ness in a papermaking process. Said solution essentially eliminates the huge water volumes and the feedbacks in a paper machine short circulation.
  • the object of the present invention is to avoid the limitations set by the prior art by feeding dilution water as small partial flows through the rotor of a pressurized screen, so that the kinetic energy of the water is utilized for the generation of useful turbulence and the resuspension of concentrated fibre layer.
  • An object of the invention is also to avoid the previous problem of clogged channels and nozzles.
  • the object of the present invention is to produce a screening process involving a small volume and avoiding feedback loops. Said screening process is especially useful in a self cleaning papermaking process.
  • the invention provides a process, whereby the thickening of a fibre suspension to be screened is prevented by continuous dilution and which makes an essentially total separation of good fibres from the reject before said reject is extracted from the screen. This makes possible the efficient cleaning of the fibre suspension in one stage and produces a simpler and more advantageous process.
  • the invention relates to a pressurized screen for the screening of a fibre suspension
  • a pressurized screen for the screening of a fibre suspension comprising a screen housing outside and a rotor inside a perforated screen plate cylinder, whereby a screening zone retaining the reject is formed between said screen plate cylinder and said rotor and an accept chamber receiving the accept is formed between said screen plate cylinder and said screen housing said rotor having means for the feeding of dilution water into said fibre suspension.
  • a characteristic feature of a screen according to the present invention resides in that said rotor comprises a dilu ⁇ tion water piping leading directly from outside said housing to multiple dilution water nozzles opening close to the screening surface of said screen plate cylinder and rotating with said rotor.
  • the pipes should be designed to provide a continuous and relatively high speed of flow in each of said pipes in order to prevent biological activity and buildup of deposits in the pipes.
  • said suspension is diluted during the screening process by water fed through a rotor rotating inside a screen plate cylinder. Said dilution water is led from outside said screen directly via numerous pipes in said rotor to the screening zone of said screen as locally directed flows generating turbulence close to the screening surface of said screen.
  • the screen according to the invention is particularly well suited for use in a paper machine short circulation immediately before the paper machine head- box, in a process wherein backwater is recycled as air free flows directly from the paper machine forming fabric to the dilution water nozzles of the pressuri ⁇ zed screen.
  • Fig 1 shows a preferred embodiment of a screen according to the invention as a schematic section.
  • Fig 2 shows a section of the screen represented in Fig 1 along line A-A.
  • Fig 3 shows another embodiment of the screen according to the invention.
  • Fig 4 shows a papermachine wet end, in which a pressurized screen according to the invention is used.
  • Fig 1 represents in general a pressurized screen 10 according to the invention, which has an essentially cylindrical housing 12 and situated therein an essen ⁇ tially cylindrical perforated screen plate cylinder 16, the holes of which are designed to allow passage of the accept of a fibre suspension to be screened.
  • Inside the screen plate cylinder 16 at a distance from its inner surface is a rotor 14 coaxial with the same.
  • a fibre suspension inlet 10 and an inject chamber 1 1 are a fibre suspension inlet 10 and an inject chamber 1 1 , limited by the bottom 12' of housing 12 and correspondingly of the bottom 14' of rotor 14.
  • a screening zone 15 is formed between the screen plate cylinder 16 and the mantle of rotor 14 .
  • an accept chamber 17 forms outside screen plate cylinder 16, between said cylinder 16 and the mantle of housing 12.
  • the mantle of housing 1 2 is slightly conical and equally the mantle of rotor 14 is slightly conical, so that their diameters are smaller at the inlet end than at the outlet end.
  • the screen plate cylinder 1 6 between them is however essentially cylindrical.
  • the section of the screening zone 1 5 decreases and correspondingly the section of accept chamber 1 7 increases from the inlet end towards the outlet end, permitting the axial flow speed of the fibre suspension to be screened and of the accept to remain essentially constant and sufficiently high throughout the screen, in spite of the flow of accepts from the screening zone to the accept chamber.
  • an accept outlet pipe or pipes 24 join the accept chamber 1 7.
  • the outlets 24 of Fig 1 are positioned opposite to the inlet chamber 1 1 .
  • the outlets can also be positioned at other parts of the mantle of housing 1 2, favorably close to the inlet chamber 1 1 , and that in this case the favorable conicity of housing 1 2 would be reversed so that the largest section of accept chamber 17 would be closest to the outlet pipe or pipes 24.
  • reject zone 19 At the end of the screening zone 1 5 begins a reject zone 19, limited by the separation ring 25 and the rotor mantle.
  • reject dilution water is brought through an inlet 29 through a top cover 30 of housing 1 2 and further into a distribution space formed between the top cover 30 and the top 31 rotor 14, said top 31 favorably being equipped with grooves or ribs for facilitating the distribution of dilution water to the reject zone.
  • the reject dilution water is brought to reject dilution nozzles in the reject zone, through a sepa ⁇ rate piping in the rotor in a similar manner as the dilution water for dilution in the screening zone.
  • the fibre suspension to be screened contains a relatively higher proportion of reject material. It may therefore be appropriate to graduate the perforation of the screen plate cylinder so, that the perforation is finer at the reject end of the screening zone.
  • the shaft 28 of rotor 14 contains a number of dilution water pipes 22, which lead into rotor 14 ending at dilution water nozzles 20 close to the screen plate cylinder 1 6.
  • a fibre suspension is fed through the inlet pipe 10 to inject chamber 1 1 , from where it passes into the screening zone 1 5.
  • the feeding pressure and centrifugal force cause a flow through the screen plate cylinder 1 6 to the accept chamber 17.
  • An acceptable fine fraction flows with the flow whereas the screen plate cylinder 1 6 retains the coarse fraction to be separa ⁇ ted and also a statistical part of the acceptable fibres.
  • the screen plate retains the material to be separated as well as a part of the acceptable fibres, relatively more water than solids pass the screen plate cylinder 16. Therefore the solids content tends to increase in the scree ⁇ ning zone 1 5.
  • the increase in solids content is countered by feeding dilution water into the screening zone.
  • the dilution water is fed through the pipes 22 going directly through the rotor 14 to nozzles 20 at the surface of the rotor.
  • the dilution water is fed so, that the discharge of water through nozzles 20 cause local spots of turbu ⁇ lence, which act on the fibre material collected on screen plate cylinder 1 6, detaching the layer of fibres and reject which has gathered on the screen plate and impedes the flow.
  • the number of nozzles 20 should be sufficiently big, typically 5 to 100, favorably 20 to 50, so that essentially all the screening surface, subject to thickening can be swept by the dilution water jets, and so that the dilution can be split into parts, sufficiently small for not causing significant variation in accept consistency.
  • the thickening of inject stock progresses gradually, and normally does not constitute a problem at the beginning of the screening process.
  • the dilution nozzles therefore, can favorably be concentrated to the second half or last third of the screening zone.
  • the flow can also be promoted by causing turbulence and counter flow pressure pulses at the screening surface by means of mechanical turbulence generators 18.
  • the turbulence generators 18 can be for example bumps in the rotor surface or separate foils.
  • the dilution water is favorably fed into dilution water pipes 20 through a rotary joint 27 arranged at the shaft 28 of rotor 14.
  • the dilution lines 22 can be grouped into groups, having separately controllable feeding flows.
  • Fig 2 represents section A-A of the screen in Fig 1 seen from above. It shows an arrangement of separate dilution water pipes 22, ending in nozzles 20, which in the represented embodiment are integrated into turbulence generating bumps 18.
  • the nozzles can also be arranged independently of the bumps, preferably so, that the direction of the dilution water jet from the nozzles is essentially parallel or tangential to the screen plate cylinder 16.
  • Fig 2 also shows how the outlet pipes 24 are separated from the direct influ ⁇ ence of pressure pulses from bumps 18 by the separation ring 25.
  • Figures 1 and 2 represent an embodiment of the invention, where every nozzle 20 has its own feeding pipe 22, without ramifications, designed for a conti ⁇ nuous high flow speed.
  • the flow speed should be sufficient to prevent biological activity in the pipes and also prevent build-up of deposits. It is known that piping will remain clean by itself, if the flow passes the pipe wall with a sufficient speed, or at least about 3 meters per second and there are no sharp angles or dead spaces retarding the flow. It is also known that in such situations turbulence prevents the forming of fibre bundles.
  • nozzles 20 are very large, it is difficult to install an individual feeding pipe 22 for every nozzle in rotor 14. In this case the nozzles can be grouped so, that the distribution between nozzles is made inside the rotor.
  • the nozzles 20 are preferably shaped for feeding the dilution water locally at a high speed close to the screening surface.
  • Fig 3 represents an embodiment, where the parts and the used reference numbers correspond to those presented in Fig 1.
  • the screen according to Fig 3 functions essentially in the same way as the screen according to Fig 1.
  • the feeding pipes 22 and 26 leading to nozzles 20 and 20', respecti ⁇ vely, are grouped together in the center of the rotor 14.
  • the dilution water is lead directly from the dilution water lines 21 and 29, respectively, through rotary joint 27 to distribution pipes 22 and 26.
  • the reject dilution water is fed to separate reject dilution nozzles 20' by the reject dilution water line 29 through rotary joint 27 and reject dilution pipes 26 going through the rotor shaft 28 and the rotor 14.
  • the dilution water pipes have one or more ramifications, these have to be executed according to known technology, so that, by action of the flow, the ramification point is kept in such state of turbulence that deposition of dirt and forming of fibre bundles is avoided.
  • the suspension to be cleaned is kept in a consistency suitable for efficient screening by means of continuous dilution, until essentially all acceptable fibres have passed the screening plate cylinder 16 at the end of the screening zone 15.
  • the reject which is retained by the screening drum has a tendency to thicken.
  • a last dilution is made in the reject zone at the end of the screening zone by separate reject extracting water 29, whereby the consistency of the reject is brought to a level whereby it can be discharged through reject discharge 23 without risk for clogging or abrasion.
  • Figure 4 represents an forming process for a paper web, where the advantages of a screen according to the invention, functioning efficiently in one single stage, are utilized particularly efficiently.
  • the distribution piping 125 consists of a multiple accept pipes of the screen 121 , arranged so that they are of essentially equal length, and further so that the number and curvature of eventual sharp bends are essentially identical for all pipes. With this arrangement, a uniform distribution of stock across the whole width of the paper machine can be granted.
  • the stock is fed to a sheet forming part, which can be of different known types.
  • sheet forming the major part of the water contained in the fibre suspension is drained into separate draining boxes 101 , 102, 103 in connection with the forming fabric or fabrics.
  • the backwater, collected in the draining boxes is preferably recycled back into the main process flow as separate air free flows, without passing through open vessels, by means of multiple pumps of which at least a part are preferably air separa ⁇ ting pumps 1 10, such as gas separation pumps according to copending Patent Application 922283, by same inventor.
  • the backwater to be recycled is brought to the various dilution points of the short circulation as separate flows, so that the dilution water required by the screen, subject to the present inven ⁇ tion, and by the cleaner preceding the same in the stock flow, flows directly to the stock main flow, without tube ramifications or upstream recirculations.
  • the single stage function without feed back of reject and without recycling of backwater or fibre suspension essentially accelerates reaching of a new state of equilibrium in connection with a change of paper grade or process adjust ⁇ ment, and thus considerably reduces the amount of waste paper produced at a grade change and improves the process controllability.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un épurateur pressurisé conçu pour épurer les suspensions de pâte à papier. Ledit épurateur est constitué d'un cylindre (16) de platine d'épurateur ceint d'un carter (12) et contient un rotor (14). Ledit rotor contient des conduites d'eau de dilution (22) directement raccordées à des buses d'eau de dilution (20) déchargeant à proximité de la surface d'épuration dudit cylindre de la platine d'épurateur (16) et tournant avec ledit rotor (14). L'invention porte également sur un procédé de lavage d'une suspension de fibres dans un épurateur pressurisé, qui consiste à diluer, au cours du procédé d'épuration, la suspension de fibres avec l'eau de dilution envoyée directement de l'extérieur dudit carter (12) vers ladite surface d'épuration. L'épurateur selon l'invention est particulièrement utile dans le cyclage court d'une machine de fabrication de papier.
PCT/FI1993/000213 1992-05-19 1993-05-19 Procede et appareil d'epuration de suspension de pate a papier WO1993023609A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI922284 1992-05-19
FI922284A FI90792C (fi) 1992-05-19 1992-05-19 Menetelmä ja laite kuitususpension puhdistamiseksi

Publications (1)

Publication Number Publication Date
WO1993023609A1 true WO1993023609A1 (fr) 1993-11-25

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Family Applications (1)

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PCT/FI1993/000213 WO1993023609A1 (fr) 1992-05-19 1993-05-19 Procede et appareil d'epuration de suspension de pate a papier

Country Status (3)

Country Link
AU (1) AU4071393A (fr)
FI (1) FI90792C (fr)
WO (1) WO1993023609A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016226A1 (fr) * 1994-11-21 1996-05-30 Pom Technology Oy Ab Appareil et procede d'epuration d'une suspension fibreuse et procede de production de papier mettant en ×uvre ces derniers
US5567278A (en) * 1992-05-19 1996-10-22 Pom Technology Oy Ab Process and apparatus for circulating backwater in a papermaking machine
WO1998046821A1 (fr) * 1997-04-14 1998-10-22 Sunds Defibrator Industries Ab Appareil de tamisage dote d'un moyen d'alimentation en liquide de dilution
WO1999032711A1 (fr) * 1997-12-19 1999-07-01 Valmet Fibertech Ab Dispositif de tamisage
EP0936300A1 (fr) * 1998-02-11 1999-08-18 Voith Sulzer Papiertechnik Patent GmbH Procédé pour nettoyer et amener une suspension
WO2001040570A1 (fr) * 1999-11-29 2001-06-07 Andritz Oy Dispositif et rotor destines au criblage de pulpes
WO2003104549A1 (fr) * 2002-06-07 2003-12-18 Metso Paper, Inc Appareil classeur a plusieurs etages, panier classeur et procede pour classer des suspensions de pate
US6702120B1 (en) 1999-03-29 2004-03-09 Valmet Fibertech Ab Screening apparatus including two screen means
US6938846B1 (en) 1999-04-08 2005-09-06 Valmet Fibertech Ab Screening apparatus with slot ring moveable in axial direction
CN106758467A (zh) * 2016-11-17 2017-05-31 绥阳县双龙纸业有限公司 压力筛缓冲装置
WO2018124443A1 (fr) * 2016-12-26 2018-07-05 나성주 Machine de tamisage pour le tamisage de matériau en papier, corps de carter pour machine de tamisage et panier à tamis
US20220349124A1 (en) * 2021-04-30 2022-11-03 Andritz (China) Ltd. Pressure Screen and Method for Dilution for a Pressure Screen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1007576A (en) * 1973-07-18 1977-03-29 Andrew C. Martin Vertical pressure pulp screening device
US4202761A (en) * 1977-03-23 1980-05-13 Hermann Finckh Maschinenfabrik Sorting apparatus for sorting fiber suspensions
US4749474A (en) * 1986-08-27 1988-06-07 Ingersoll-Rand Company Screening apparatus
FR2666598A1 (fr) * 1990-09-10 1992-03-13 Escher Wyss Gmbh Procede de separation, notamment de tri ou de fractionnement d'une suspension de pate a papier.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1007576A (en) * 1973-07-18 1977-03-29 Andrew C. Martin Vertical pressure pulp screening device
US4202761A (en) * 1977-03-23 1980-05-13 Hermann Finckh Maschinenfabrik Sorting apparatus for sorting fiber suspensions
US4749474A (en) * 1986-08-27 1988-06-07 Ingersoll-Rand Company Screening apparatus
FR2666598A1 (fr) * 1990-09-10 1992-03-13 Escher Wyss Gmbh Procede de separation, notamment de tri ou de fractionnement d'une suspension de pate a papier.

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5567278A (en) * 1992-05-19 1996-10-22 Pom Technology Oy Ab Process and apparatus for circulating backwater in a papermaking machine
US5968315A (en) * 1994-11-21 1999-10-19 Pom Technology Oy Ab Process and apparatus for screening a fibre suspension in a pressurized screen having a rotating screen-drum
WO1996016226A1 (fr) * 1994-11-21 1996-05-30 Pom Technology Oy Ab Appareil et procede d'epuration d'une suspension fibreuse et procede de production de papier mettant en ×uvre ces derniers
US6290067B1 (en) 1997-04-14 2001-09-18 Valmet Fibertech Aktiebolag Screening apparatus with dilution liquid supply means
WO1998046821A1 (fr) * 1997-04-14 1998-10-22 Sunds Defibrator Industries Ab Appareil de tamisage dote d'un moyen d'alimentation en liquide de dilution
WO1999032711A1 (fr) * 1997-12-19 1999-07-01 Valmet Fibertech Ab Dispositif de tamisage
US6241102B1 (en) 1997-12-19 2001-06-05 Valmet Fibertech Ab Screening device
EP0936300A1 (fr) * 1998-02-11 1999-08-18 Voith Sulzer Papiertechnik Patent GmbH Procédé pour nettoyer et amener une suspension
US6702120B1 (en) 1999-03-29 2004-03-09 Valmet Fibertech Ab Screening apparatus including two screen means
US6938846B1 (en) 1999-04-08 2005-09-06 Valmet Fibertech Ab Screening apparatus with slot ring moveable in axial direction
WO2001040570A1 (fr) * 1999-11-29 2001-06-07 Andritz Oy Dispositif et rotor destines au criblage de pulpes
US6719145B1 (en) 1999-11-29 2004-04-13 Andritz Oy Arrangement and rotor for screening of pulp
WO2003104549A1 (fr) * 2002-06-07 2003-12-18 Metso Paper, Inc Appareil classeur a plusieurs etages, panier classeur et procede pour classer des suspensions de pate
US7491296B2 (en) 2002-06-07 2009-02-17 Metso Paper, Inc. Multi-stage screening apparatus, screen basket and method for screening pulp suspensions
CN106758467A (zh) * 2016-11-17 2017-05-31 绥阳县双龙纸业有限公司 压力筛缓冲装置
WO2018124443A1 (fr) * 2016-12-26 2018-07-05 나성주 Machine de tamisage pour le tamisage de matériau en papier, corps de carter pour machine de tamisage et panier à tamis
CN110168163A (zh) * 2016-12-26 2019-08-23 罗诚柱 用于筛选纸料的筛选机、筛选机壳体以及筛篮
US11286616B2 (en) 2016-12-26 2022-03-29 Sung Ju NA Screen machine for screening for paper material, casing body for screen machine, and screen basket
US20220349124A1 (en) * 2021-04-30 2022-11-03 Andritz (China) Ltd. Pressure Screen and Method for Dilution for a Pressure Screen
US11926961B2 (en) * 2021-04-30 2024-03-12 Andritz (China) Ltd. Pressure screen and method for dilution for a pressure screen

Also Published As

Publication number Publication date
FI922284A (fi) 1993-08-03
FI922284A0 (fi) 1992-05-19
FI90792B (fi) 1993-12-15
FI90792C (fi) 1994-03-25
AU4071393A (en) 1993-12-13

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