WO2000015900A1 - Procede et dispositif de lavage de melange de pate a fibres - Google Patents

Procede et dispositif de lavage de melange de pate a fibres Download PDF

Info

Publication number
WO2000015900A1
WO2000015900A1 PCT/FI1999/000751 FI9900751W WO0015900A1 WO 2000015900 A1 WO2000015900 A1 WO 2000015900A1 FI 9900751 W FI9900751 W FI 9900751W WO 0015900 A1 WO0015900 A1 WO 0015900A1
Authority
WO
WIPO (PCT)
Prior art keywords
wires
dewatering section
dewatering
fibre pulp
pulp
Prior art date
Application number
PCT/FI1999/000751
Other languages
English (en)
Inventor
Vesa Juutinen
Jouko Hautala
Original Assignee
Metso Paper Inc.
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 Inc. filed Critical Metso Paper Inc.
Priority to DE69941984T priority Critical patent/DE69941984D1/de
Priority to AU57493/99A priority patent/AU5749399A/en
Priority to JP2000570414A priority patent/JP2002525446A/ja
Priority to CA002343957A priority patent/CA2343957A1/fr
Priority to KR1020017003210A priority patent/KR20010075065A/ko
Priority to BR9913695-3A priority patent/BR9913695A/pt
Priority to AT99944666T priority patent/ATE456700T1/de
Priority to EP99944666A priority patent/EP1115945B1/fr
Publication of WO2000015900A1 publication Critical patent/WO2000015900A1/fr
Priority to US09/808,554 priority patent/US20020056532A1/en

Links

Classifications

    • 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
    • D21D1/40—Washing the fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
    • 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
    • D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts

Definitions

  • the invention relates to a method for washing fibre pulp, in which method fibre pulp is fed into a dewatering section and water and, with it, ash and/or other impurities are removed through a wire running in the same direction as the fibre pulp in the dewatering section.
  • the invention further relates to an apparatus for washing a fibre pulp mixture, which apparatus comprises a dewatering section which is restricted by a wire moving longitudinally along it and to the other end of which the fibre pulp mixture is fed and correspondingly removed at the other end, and water is removed from the fibre pulp mixture through the wire in the dewatering section.
  • Fibre pulp such as recycled fibre
  • water is removed from it in a manner that aims at removing particle-type material, such as ash, with the water while useful fibres are retained in the fibre pulp.
  • Apparatuses like this were presented in the Tappi Conference 15 to 19 June 1998, for instance, and according to a presentation given in the conference, a good washing result is achieved by two wire-type apparatuses only.
  • One apparatus comprises two separate large-diameter rolls around which runs a wire.
  • the other apparatus comprises only one large-diameter roll and a separate wire section with associated apparatuses.
  • the fibre matter is fed into a gap between the roll and the wire.
  • both apparatuses a majority of the water is removed through one wire.
  • a problem with both apparatuses is the small fibre matter washing capacity per width meter of apparatus.
  • a further problem with both apparatuses is a poor wire durability, because, in both solutions, the finer side of the wire is against the roll.
  • neither solution provides the possibility of substantially adjusting the level of dewatering or thereby the quantity of fines lost during washing by other means than changing wires.
  • a yet further problem with both apparatuses is that the dry stuff content of the washed fibre material exiting the apparatus is relatively low and thus usually requires a separate concentration prior to further processing.
  • a yet another problem with both apparatuses is that they require a high wire speed which is disadvantageous with respect to both energy consumption and wire durability.
  • the method of the invention is characterized in that the pulp is fed into a dewatering section formed between two wires and the wires are arranged to run in such a way that the dewatering section converges from the feed end to the outlet end, that water and, with it, impurities are removed in the dewatering section through both wires, and that after the dewatering section, the wires and the pulp between them are led to run along a curving surface in such a way that pressure caused by the tightness of the wires and the centrifugal force produced by the curved movement cause the removal of any extra water from the pulp.
  • the apparatus of the invention is characterized in that there is a first and a second wire and a dewatering section is formed between the wires, and water and, with it, impurities are removed through both wires, that the wires are arranged to run in such a way that the dewatering section converges from the end where the fibre pulp mixture is fed in towards the outlet end of the dewatering section, and that the apparatus comprises a curved surface located after the dewatering section, along which surface both wires and the fibre pulp mixture between them is arranged to turn to remove any extra water from the fibre pulp by means of pressure caused by the tightness of the wires and the centrifugal force produced by the curved movement.
  • the essential idea of the invention is that the fibre pulp is fed between two wires, whereby dewatering and thus also washing occurs in both directions in the dewatering section.
  • a further essential idea of the invention is that the fibre pulp coming out of the dewatering section between the wires is led together with both wires to run along a curved surface, preferably a turning roll, whereby the removal of any extra water is achieved by means of pressure caused by the tightness of the wires and the centrifugal force produced by the curved movement.
  • the fibre pulp is preferably fed to a closed dewatering chamber through which the wires run in such a manner that produces a convergent dewatering section between the wires.
  • One preferred embodiment of the invention is based on the idea that turbulence is caused in the fibre pulp before it is fed into the dewatering section, whereby dewatering and thus also washing is performed as efficiently as possible and as far as possible along the length of the dewatering section without causing layers of fibres on top of the wires.
  • An essential idea of one preferred embodiment of the invention is that the dewatering in the beginning of the dewatering zone is performed in such a manner that the flow rate of the fibre pulp differs from the motion speed of the wires in the beginning of the dewatering section. This way, turbulence caused in the fibre pulp before it is fed into the section can be efficiently maintained for as long as possible.
  • a yet another essential idea of the invention is that the dewatering section is made so as to curve towards the inside in such a manner that its cross-profile decreases quicker at the forward end than at the tail end.
  • the invention provides the advantage that this way a very efficient dewatering is achieved, which combined with the dewatering performed by means of the turning roll results in preferably achieving a high enough dry stuff content in the washed fibre material for the purpose of further processing.
  • a further advantage of the invention is that when washing the fibre pulp, ash and other particle-type material can very efficiently be removed from the fibre pulp along with water while the fibres of desired length remain efficiently in the fibre pulp mixture.
  • a yet further advantage of the invention is that a sufficiently high concentration of the fibre pulp is achieved after washing without additional presses or corresponding mechanical apparatuses.
  • dewatering and thus also the washing result can substantially be adjusted with control valves or other control elements in the area of the dewatering chamber, which also improves the washing result and fines loss.
  • dewatering is adjusted in such a manner that more water per length of fibre pulp mixture in the motion direction is removed in the forward end than in the tail end of the dewatering zone.
  • dewatering is adjusted in such a manner that approximately the same amount of water or less per length of fibre pulp mixture in the motion direction is removed in the forward end than in the tail end of the dewatering zone.
  • the apparatus of the invention also enables additional dewatering by means of a curved surface, such as a turning roll, located after the dewatering section. No edge sealing is necessary after the actual dewatering section, because the clearance in the outlet end of the section is adjusted in such a manner that the dry stuff content of the fibre pulp mixture in the outlet end is already sufficiently high.
  • the actual additional dewatering is done based on wire tightness and centrifugal force on the curved surface.
  • the apparatus of the invention provides considerable advantages in comparison with other corresponding apparatuses.
  • Dewatering and washing with the apparatus of the invention occurs in two directions, which provides a considerable capacity increase in comparison with the working width of the apparatuses described above.
  • the apparatus also preferably contains a separate turbulence element. With the apparatus, the flow rate of the fibre pulp mixture in the dewatering section is kept suitable in relation to the wire speed. Both factors thus contribute to effectively preventing an eariier than necessary infiltration of the fibre pulp mixture on the surface of the wires, thus maintaining a good washing result.
  • the washing result and fines loss can also effectively be adjusted by controlling the dewatering in different ways in the longitudinal direction of the apparatus.
  • Figure 1 shows a schematic sectional side view of an embodiment of the apparatus of the invention
  • Figures 2a and 2b show schematically a structure of the apparatus of the invention after the outlet opening of the dewatering section and a detail of it,
  • Figure 3 shows a schematic sectional side view of a second embodiment of the apparatus of the invention
  • Figure 4 shows a sectional side view of a third embodiment of the apparatus of the invention.
  • Figure 5 shows schematically the effect of washing on the fibre distribution of a fibre pulp implemented by the apparatus and method of the invention.
  • FIG. 1 shows a schematic sectional side view of an embodiment of the apparatus of the invention.
  • the apparatus comprises a first wire 1 and a second wire 2, between which a dewatering section 3 is formed.
  • the first wire 1 runs as a closed loop around guide rolls 4a to 4d and the second wire 2 correspondingly around a turning roll 5 and guide rolls 6a and 6b.
  • the number and location of guide rolls can be any suitable one, which fact is known per se and obvious to a person skilled in the art.
  • the fibre pulp mixture to be washed is fed into a feeder chamber 7 from which it is preferably fed for instance through turbulence generator 8, known per se, to the dewatering section 3 formed between the first and second wire 1 and 2.
  • the dewatering section 3 is preferably a closed chamber formed by sides and support structures between the sides, along which the wires 1 and 2 run inside the dewatering chamber.
  • the dewatering boxes 9, 10 or the like are installed on the support structures in such a manner that the water draining through the wires runs through the support structures into the dewatering boxes or the like.
  • a closed dewatering chamber refers specifically to a structure in which the fibre pulp and the water it contains cannot exit the dewatering section along other than the desired dewatering routes.
  • the fibre pulp mixture has to flow from the dewatering section 3 onward in the same direction as the wires 1 and 2. Simultaneously, water is removed from it along the entire way. Dewatering occurs in the dewatering section for instance in such a manner that preferably more water per length of fibre pulp mixture in the motion direction is removed in the forward end of the dewatering section 3, i.e. the incoming end of the fibre pulp, than in the tail end of the dewatering section 3.
  • Turbulence caused in the fibre pulp mixture in advance can also be maintained by adjusting the dewatering based on the speed ratio difference and the fibres stay suitably mixed without any significant infiltration on the surfaces of the wires 1 and 2.
  • the fibre pulp mixture arrives at the turning roll 5, more water is removed from it by means of the centrifugal force and the tightness of the wires up through the wire 1 to a dewatering tray 11 resulting in a fibre pulp with a suitable dry stuff content. Since the concentration of the fibre pulp mixture when coming out of the dewatering section 3 is rather high, the fibre pulp mixture stays between the wires 1 and 2 without gushing out from the side. Thus, this apparatus does not need any separate sealing after the dewatering section.
  • the dewatering distribution along the length of the dewatering section can be altered in many ways. If, in the forward end of the dewatering section, water is drained from the fibre pulp mixture faster than the speed with which the cross-sectional area of the dewatering section decreases, the flow speed of the fibre pulp decreases in this area. Another consequence is that closer to the outlet opening of the dewatering section, water is drained slower than the speed with which the cross-sectional area of the dewatering section decreases, which results in a fibre pulp mixture speed at the outlet opening which equals the motion speed of the wires.
  • the speed of the fibre pulp mixture becomes higher than the motion speed of the wires, and in this case dewatering closer to the outlet opening of the dewatering section must be greater in relation to the decrease in the cross-sectional area of the dewatering section so that the speed of the fibre pulp mixture at the outlet opening is the same as the motion speed of the wires 1 and 2.
  • Both alternatives can be achieved for instance by constricting the dewatering channels and thus adjusting the outflow, or by various other generally known measures.
  • the result is that a flow speed of fibre pulp mixture differing from the motion speed of wires maintains/causes turbulence and thus aids the operation of the apparatus in certain conditions.
  • water can be fed into the fibre pulp mixture before the turning roll 5 from nozzles 13 below the wire 2, in which case water, while flowing through the fibre pulp mixture, transports these particle-type solids to the other side of the fibre pulp mixture and on through the wire 1 , after which both water and particles are hurled into the dewatering tray 11.
  • Figure 2a shows schematically a structure of the apparatus of the invention immediately after the outlet opening of the dewatering section before the wires and the fibre pulp arrive at the turning roll 5.
  • the figure shows how the dewatering zone is everywhere surrounded by either the higher or the lower support structure, such as cover part 3a or 3b or sides 3c, and the wires 1 and 2 correspondingly press against the higher and the lower support structures.
  • the fibre pulp mixture for its part, fills the space between the wires 1 and 2 and the dewatering section from the wires towards the edges.
  • the first wire 1 higher in the figure is preferably slightly narrower than the lower second wire 2.
  • Figure 3 shows a sectional side view of a second embodiment corresponding to the embodiment of the apparatus in Figure 1 , except that a separate dewatering shoe 15 has been added to it between the dewatering section and the turning roll 5, along which shoe the wires 1 and 2 run to remove water from the fibre pulp mixture.
  • the dewatering shoe 15 has advantageously a curved surface, preferably so that its curve is smaller than the curve of the turning roll 5 following it, or of any other corresponding curved surface. This way, dry stuff content can be raised even further without complex and expensive presses or other corresponding apparatuses.
  • the figure shows pressure pulse elements, in this case separate strips 16, located in the dewatering section at the second wire 2.
  • Figure 4 shows a third embodiment of the apparatus of the invention, in which the turning roll 5 is replaced by a curved shoe 17 around which the wires and the fibre pulp mixture turn.
  • the shoe can have a surface with strips, or be implemented in any other manner known per se, whereby water can also be sucked through the wire 2, or strips can be used to produce suction to improve dewatering.
  • Figure 5 shows schematically the effect of washing on the fibre distribution of a fibre pulp implemented by the apparatus and method of the invention.
  • the distribution of fibres of different lengths is measured by a measuring method known per se and the figure illustrates the proportion of the fibres of different lengths in the fibre pulp used in the test before and after washing.
  • I represents the proportion of the longest fibres
  • V the proportion of the fines and ash in the pulp.
  • a significant amount of parts in the V group i.e. ash and fines
  • the proportion of other fibre contents in the washed pulp is correspondingly higher.
  • the figure shows clearly that washing removes the part of the pulp being washed that it is supposed to, and other fibres remain well in the pulp being washed.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

La présente invention concerne un procédé et un appareil de lavage d'un mélange de pâte à fibres permettant d'en éliminer l'eau entraînant avec elle les cendres et autres impuretés particulaires. En l'occurrence, on introduit entre deux toiles métalliques la pâte à fibres à laver de façon à faire passer par les deux toiles métalliques l'eau et les cendres à éliminer de la pâte à fibres. On fait alors défiler les toiles métalliques et la pâte à fibres sur une surface incurvée de façon à retirer tout supplément d'eau sous l'effet de la pression des toiles métalliques et de la force centrifuge. L'appareil comporte deux toiles métalliques (1, 2) et un poste d'essorage entre les deux toiles métalliques (1, 2), l'eau et les impuretés étant éliminées dans le poste d'essorage au travers des deux toiles (1, 2).
PCT/FI1999/000751 1998-09-14 1999-09-14 Procede et dispositif de lavage de melange de pate a fibres WO2000015900A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE69941984T DE69941984D1 (de) 1998-09-14 1999-09-14 Verfahren und vorrichtung zum waschen einer mischung von faserstoffsuspensionen
AU57493/99A AU5749399A (en) 1998-09-14 1999-09-14 Method and apparatus for washing fibre pulp mixture
JP2000570414A JP2002525446A (ja) 1998-09-14 1999-09-14 繊維素パルプ混合物の洗浄方法及び洗浄装置
CA002343957A CA2343957A1 (fr) 1998-09-14 1999-09-14 Procede et dispositif de lavage de melange de pate a fibres
KR1020017003210A KR20010075065A (ko) 1998-09-14 1999-09-14 섬유 펄프 혼합물 세척 방법 및 장치
BR9913695-3A BR9913695A (pt) 1998-09-14 1999-09-14 Processo e aparelho para lavagem de mistura de polpa de fibra
AT99944666T ATE456700T1 (de) 1998-09-14 1999-09-14 Verfahren und vorrichtung zum waschen einer mischung von faserstoffsuspensionen
EP99944666A EP1115945B1 (fr) 1998-09-14 1999-09-14 Procede et dispositif de lavage de melange de pate a fibres
US09/808,554 US20020056532A1 (en) 1998-09-14 2001-03-14 Method and apparatus for washing fiber pulp mixture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981974 1998-09-14
FI981974A FI114812B (fi) 1998-09-14 1998-09-14 Menetelmä ja laite kuitumassaseoksen pesemiseksi

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/808,554 Continuation US20020056532A1 (en) 1998-09-14 2001-03-14 Method and apparatus for washing fiber pulp mixture

Publications (1)

Publication Number Publication Date
WO2000015900A1 true WO2000015900A1 (fr) 2000-03-23

Family

ID=8552481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000751 WO2000015900A1 (fr) 1998-09-14 1999-09-14 Procede et dispositif de lavage de melange de pate a fibres

Country Status (12)

Country Link
US (1) US20020056532A1 (fr)
EP (1) EP1115945B1 (fr)
JP (1) JP2002525446A (fr)
KR (1) KR20010075065A (fr)
CN (1) CN1156629C (fr)
AT (1) ATE456700T1 (fr)
AU (1) AU5749399A (fr)
BR (1) BR9913695A (fr)
CA (1) CA2343957A1 (fr)
DE (1) DE69941984D1 (fr)
FI (1) FI114812B (fr)
WO (1) WO2000015900A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100858678B1 (ko) * 2006-09-01 2008-09-17 한국생산기술연구원 불순입자 제거 장치
FI120880B (fi) * 2008-10-24 2010-04-15 Metso Paper Inc Muodostusosa

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491521A (en) * 1981-09-29 1985-01-01 Escher Wyss Gmbh Dewatering apparatus
US4544447A (en) * 1983-02-09 1985-10-01 Maschinenfabrik Andritz Actiengesellschaft Dehydration machine for pulp, sludges or similar fibrous materials
DE4218174A1 (de) 1991-06-13 1992-12-17 Andritz Patentverwaltung Doppelsiebentwaesserungseinrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491521A (en) * 1981-09-29 1985-01-01 Escher Wyss Gmbh Dewatering apparatus
US4544447A (en) * 1983-02-09 1985-10-01 Maschinenfabrik Andritz Actiengesellschaft Dehydration machine for pulp, sludges or similar fibrous materials
DE4218174A1 (de) 1991-06-13 1992-12-17 Andritz Patentverwaltung Doppelsiebentwaesserungseinrichtung

Also Published As

Publication number Publication date
US20020056532A1 (en) 2002-05-16
FI981974A0 (fi) 1998-09-14
EP1115945B1 (fr) 2010-01-27
ATE456700T1 (de) 2010-02-15
EP1115945A1 (fr) 2001-07-18
DE69941984D1 (de) 2010-03-18
JP2002525446A (ja) 2002-08-13
CN1318119A (zh) 2001-10-17
FI114812B (fi) 2004-12-31
FI981974A (fi) 2000-03-15
KR20010075065A (ko) 2001-08-09
AU5749399A (en) 2000-04-03
CA2343957A1 (fr) 2000-03-23
BR9913695A (pt) 2001-06-05
CN1156629C (zh) 2004-07-07

Similar Documents

Publication Publication Date Title
US4501040A (en) Method and apparatus for washing stock suspensions by removing undesired material through an endless wire
US3823062A (en) Twin-wire papermaking employing stabilized stock flow and water filled seal(drainage)boxes
TWI530604B (zh) 用於降低纖維懸浮稠度之節能造紙成形裝置、系統及方法
US4447320A (en) Device for cleaning and recovering paper pulp
US5382327A (en) Apparatus for thickening pulp and paper stock
FI77281C (fi) Hybridformare foer en pappersmaskin.
US8236139B1 (en) Apparatus for improving basis weight uniformity with deckle wave control
PL143034B1 (en) Double-sieve paper-making machine
US5077913A (en) Self-cleaning steambox
FI90792C (fi) Menetelmä ja laite kuitususpension puhdistamiseksi
EP1115945B1 (fr) Procede et dispositif de lavage de melange de pate a fibres
US2881670A (en) Apparatus and method for de-watering stock on a fourdrinier type paper or board-making machine
KR100685759B1 (ko) 섬유 펄프 혼합물을 세척하는 방법 및 장치
US5186791A (en) Apparatus for thickening pulp and paper stock
US6491791B1 (en) Apparatus and method for treating roll surfaces and/or fabrics
JPH02133689A (ja) 抄紙機ツインワイヤホーマ
US7141143B2 (en) Method and apparatus for draining fibre pulp suspension
JP2722027B2 (ja) 円網抄紙機における供給紙料液の流量調整装置
FI56566C (fi) Viraparti i en pappermaskin med banbildning mellan tvao viror som omsluter en formeringsvals
CA2373644C (fr) Processus et dispositif pour l'essorage d'une pate mecanique, d'une pate chimique ou de papier en feuille
US4146426A (en) Apparatus for the manufacture of paper and board
FI84638C (fi) Hybridformare foer en pappersmaskin.
FI111653B (fi) Menetelmä ja laite paperin valmistusprosessin tehostamiseksi
GB1569592A (en) Method and apparatus for paper quality in a foundrinier paper making machine
CA1310500C (fr) Nettoyage de tissu

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 99810905.3

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ CZ DE DE DK DK DM EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
ENP Entry into the national phase

Ref document number: 2343957

Country of ref document: CA

Ref document number: 2343957

Country of ref document: CA

Kind code of ref document: A

Ref document number: 2000 570414

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 1999944666

Country of ref document: EP

Ref document number: 1020017003210

Country of ref document: KR

WWE Wipo information: entry into national phase

Ref document number: 09808554

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: CA

WWP Wipo information: published in national office

Ref document number: 1999944666

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 1020017003210

Country of ref document: KR

WWW Wipo information: withdrawn in national office

Ref document number: 1020017003210

Country of ref document: KR