EP0643164A1 - Verfahren zur Herstellung von Papier und damit verwendete Vorrichtung - Google Patents

Verfahren zur Herstellung von Papier und damit verwendete Vorrichtung Download PDF

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Publication number
EP0643164A1
EP0643164A1 EP94305938A EP94305938A EP0643164A1 EP 0643164 A1 EP0643164 A1 EP 0643164A1 EP 94305938 A EP94305938 A EP 94305938A EP 94305938 A EP94305938 A EP 94305938A EP 0643164 A1 EP0643164 A1 EP 0643164A1
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EP
European Patent Office
Prior art keywords
water
backwater
fraction
papermaking process
solids
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.)
Granted
Application number
EP94305938A
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English (en)
French (fr)
Other versions
EP0643164B1 (de
Inventor
Colin Austin Harris
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.)
Arjo Wiggins Fine Papers Ltd
Original Assignee
Wiggins Teape Group Ltd
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 Wiggins Teape Group Ltd filed Critical Wiggins Teape Group Ltd
Publication of EP0643164A1 publication Critical patent/EP0643164A1/de
Application granted granted Critical
Publication of EP0643164B1 publication Critical patent/EP0643164B1/de
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
    • 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
    • D21F1/68—Pulp catching, de-watering, or recovering; Re-use of pulp-water using hydrocyclones
    • 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

Definitions

  • This invention relates to a papermaking process and apparatus for use therewith. More particularly, it is concerned with such a process and apparatus having as its purpose to improve the retention of solids materials within the process, thereby reducing both materials wastage and the unacceptable discharge of such materials as effluent into the environment.
  • the papermaking process involves the slushing together of papermaking fibres and water in a machine such as a hydrapulper to form an aqueous slurry.
  • the papermaking fibres may be introduced as sheet woodpulp or (where the papermachine forms part of an integrated pulping and papermaking process) as a pulp slurry fed from the pulp mill.
  • Mineral fillers may also be added at this stage, typically being china clay, calcium carbonate or titanium dioxide.
  • the slurry from the pulper is held in stock chests and then fed through refiners and stock cleaners to the paper machine after dilution to a suitable consistency.
  • Small quantities of polyelectrolyte may also be added so as to improve retention of the solids materials after the aqueous dispersion has been laid down to form a web on the papermachine wire.
  • a papermaking process includes preparing a papermaking stock and delivering that stock to the headbox of the paper machine for delivery onto the machine wire, draining the stock on the wire and processing the backwater or white water thus obtained to generate two fractions one of which fractions has a higher solids content than the other fraction, delivering the fraction having a high solids content for use in preparing papermaking stock and discharging the fraction having a low solids content to waste or for re-use as process water in another part of the process.
  • the process includes using a centrifugal separator to form the said two fractions.
  • the centrifugal separator can supply a volume of water containing concentrated solids to each new fill of pulp to be slushed in a hydrapulper.
  • the residual clarified water is either allowed to flow to waste, perhaps after more limited effluent treatment, or used for other purposes. Due to the substantial reduction in the solids content of the clarified water, there is a corresponding substantial reduction in the load on the effluent treatment plant.
  • centrifugal separator combines the normal storage function of a backwater tank with the function of a saveall system so as to reduce material losses.
  • the separator thus permits storage of an appropriate volume of backwater or white water carrying concentrated solids for re-use in the pulp slushing process whilst leaving a residual low solids concentration in the surplus water flowing to waste.
  • This method rather than employing a separate saveall system such a disc filter, both capital and running costs are reduced significantly.
  • both energy and maintenance costs are minimised since there are no moving parts to the system.
  • a centrifugal separator comprising an upper cylindrical portion and a lower portion which can be tapered, dish shaped or of any other shape which promotes the concentration of solids.
  • the backwater or white water is introduced tangentially near the outer wall in the upper portion so as to generate a slow peripheral rotation defining a vortex. This rotation causes the solids to be retained and concentrated in the annular region adjacent to the wall of the tank. Due to the slow rotation there is minimal turbulence and the solids sediment to the bottom of the lower portion.
  • the water separating from the solids migrates inwardly and is then caused to flow upwardly in the centre of the separator as a result of displacement by new incoming backwater. As it is withdrawn this water is discharged directly or through an effluent plant to waste, or alternatively is re-used as appropriate in the papermaking process.
  • Apparatus for carrying out the process set forth above may comprise a pulp dispersion unit, means for delivering prepared stock to the headbox of a papermachine incorporating a machine wire, means for removing backwater drained through said machine wire during formation of a paper web and for delivering said backwater to a centrifugal separator for generating the first water fraction having a higher solids content and a second water fraction having a lower solid content, the capacity of said separator in respect of the high solids fraction being sufficient to hold enough liquid to supply the requirements of said pulper, and means to deliver the second fraction to waste or to another part of the process.
  • this shows a hydrapulper 1 into which raw pulp is fed as indicated at P to be slushed with water from a combined backwater tank and centrifugal separator 2 (which is described in more detail below with reference to Figures 2 and 3).
  • the pulp P fed to the hydrapulper 1 may be in the form of bales of dry papermaking pulp, or when the system is embodied in an integrated pulp and papermaking system, a pulp slurry fed from the pulping plant. Slushed pulp from the pulping plant is stored into stock chests 3 from which it is then withdrawn as required by a pump 4 and fed through refiners 5 to a small header chest 6.
  • the slurry is withdrawn from the chest 6 by pump 8 through a valve 7 and fed to cyclone cleaners 9 to the headbox 10 of the papermachine.
  • Slurry entering the pump 8 is reduced to an acceptable consistency for paper formation by the addition of high solids backwater, the source of which is described below, through the connection 11.
  • a polyelectrolyte may be added from a supply 12 thereof as to improve retention of papermaking materials on the papermachine.
  • Papermaking stock from the headbox 10 is laid down on a papermachine wire 13 and drained with the assistance of underwire foils 14 and vacuum boxes 15.
  • the formed web 16 is then lifted from the wire and fed into the press section of the papermachine, the first press of which is shown at 17.
  • sprays 19, utilising clean water are used to wash solids residues from the wire.
  • Water withdrawn by drainage through the first set 20 of the foils 14 is drained directly into a high solids backwater tank 21.
  • Vacuum is applied to the vacuum box 15 by a vacuum pump or exhauster 22 which applies vacuum through a vacuum separator 23.
  • Water collected in the holding tank 23 is withdrawn by a pump 24 and fed into the backwater tank 21.
  • Water drained from the set of foils 20 and from the vacuum boxes 15 has a relatively high solids content and is fed through the line 11 in order to adjust the consistency of the aqueous slurry being withdrawn from the header chest 6 by the pumps.
  • Water from the second set 25 of foils 14 has a lower solids content and is allowed to drain directly into the machine pit 26.
  • This water together with the wash water from the sprays 19 which collects in the machine pit 26 is passed to a medium solids backwater tank 28.
  • Further water extracted from the sheet or derived from the felt washing sprays (not shown) in the first press 17 is withdrawn by a pump 29 and also fed to the medium solids backwater tank 28.
  • Water collected in the hogpit 27 is derived from the sprays 32 immediately thereabove and has a high fibre content. This water is returned directly to the stock chests 3 through connection 33.
  • the medium solids backwater collected in the tank 28 is withdrawn by a pump 30 and fed to the separator 2, the operation of which is described below with reference to Figures 2 and 3.
  • Clarified water withdrawn from outlet 31 of the separator 2 is fed either to an effluent pit 34 or for reuse in the cleaner sprays 19, pump seals etc. in the process as indicated at 35.
  • Water flowing to the effluent pit 34 is withdrawn by a pump 36 and fed to an effluent plant 37 of known kind. Clean water from the effluent plant may then be discharged to the environment through line 38 whilst residual solids are retained at 39 for disposal.
  • the volume of residual solids is substantially less than in the same process in which a conventional backwater tank is used in place of the separator 2.
  • the separator comprises a stainless steel circular tank 40 with a conical lower portion 41.
  • the tank had a diameter of 4 metres and a capacity of the order of 30 m3.
  • Incoming backwater was pumped from the medium solids backwater tank 28 into the outer zone of the separator through a pipe 42, the water discharge being tangential so as to produce a vortex with a slow liquid rotation at a minimum velocity of approximately 0.3 m/sec. as indicated by arrows 43 in Figure 3.
  • a cylindrical baffle 46 extends downwards into the water in the tank and a weir 47 is provided in the form of an annular trough 48.
  • the trough 48 has a lower wall 49, an outer side wall 50 and an inner annular wall 51, the upper edge 52 of which is below the upper level 53 of the liquid in the tank when it is full. Liquid escaping over the weir is indicated by arrows 54 and the clarified water is removed from the trough 48 by a pipe 55 which exists from the lower wall 49 of the trough.
  • the lower portion 41 is conical but it could be dish-shaped or any other convenient shape which promotes the collection of solids.
  • Operation of such apparatus was typically as follows. For a backwater separator of 30 m3 capacity, the rate of flow of backwater from the papermachine to the separator was 80 m3/hour. The concentration of solids in the incoming backwater was measured at 165 mg/1 with the solids comprising cellulose fibre, kaolin and titanium dioxide. During a period of one hour, the pulper was filled twice with a total of 60 m3 of backwater. Clarified water overflowed from the separator for 15 minutes flowing to waste and then to Effluent Treatment. The suspended solids present in the clarified water was measured and was found to be 40 mg/1. The backwater separator therefore functioned to reduce the solids in the waste water from 165 mg/1 to 40 mg/1. This represents a typical saving.
  • Some papermaking machines employ a backwater silo. In such machines the separator of the present invention will be operated in place of this silo.

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EP94305938A 1993-08-27 1994-08-11 Verfahren zur Herstellung von Papier und damit verwendete Vorrichtung Expired - Lifetime EP0643164B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9317817 1993-08-27
GB939317817A GB9317817D0 (en) 1993-08-27 1993-08-27 Papermaking process and apparatus for use therewith

Publications (2)

Publication Number Publication Date
EP0643164A1 true EP0643164A1 (de) 1995-03-15
EP0643164B1 EP0643164B1 (de) 1997-11-26

Family

ID=10741113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94305938A Expired - Lifetime EP0643164B1 (de) 1993-08-27 1994-08-11 Verfahren zur Herstellung von Papier und damit verwendete Vorrichtung

Country Status (12)

Country Link
EP (1) EP0643164B1 (de)
JP (1) JPH07207592A (de)
AT (1) ATE160602T1 (de)
AU (1) AU667015B2 (de)
BR (1) BR9403343A (de)
CA (1) CA2130712A1 (de)
DE (1) DE69407007T2 (de)
FI (1) FI114872B (de)
GB (2) GB9317817D0 (de)
IE (1) IE940642A1 (de)
NZ (1) NZ264280A (de)
ZA (1) ZA946261B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998041684A1 (en) * 1997-03-18 1998-09-24 Valmet Corporation System for treatment and circulation of dilution water for the headbox of a paper machine
WO2002053831A1 (en) * 2000-12-19 2002-07-11 Metso Paper, Inc. Method for removing air from the tail water reservoir of a paper machine and a corresponding tail water reservoir
US6423183B1 (en) 1997-12-24 2002-07-23 Kimberly-Clark Worldwide, Inc. Paper products and a method for applying a dye to cellulosic fibers
US6582560B2 (en) 2001-03-07 2003-06-24 Kimberly-Clark Worldwide, Inc. Method for using water insoluble chemical additives with pulp and products made by said method
WO2012097938A1 (de) * 2011-01-17 2012-07-26 Voith Patent Gmbh Papiermaschine
KR101330831B1 (ko) * 2011-12-30 2013-11-18 김용철 절전형 펄프 회수장치
WO2016041773A1 (de) * 2014-09-18 2016-03-24 Voith Patent Gmbh Verfahren und vorrichtung zur herstellung eines vliesstoffes

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI117102B (fi) 1996-05-23 2006-06-15 Metso Paper Inc Menetelmä paperikoneella sen vesikiertojen järjestämiseksi
US6749721B2 (en) 2000-12-22 2004-06-15 Kimberly-Clark Worldwide, Inc. Process for incorporating poorly substantive paper modifying agents into a paper sheet via wet end addition
US7749356B2 (en) 2001-03-07 2010-07-06 Kimberly-Clark Worldwide, Inc. Method for using water insoluble chemical additives with pulp and products made by said method
US7670459B2 (en) 2004-12-29 2010-03-02 Kimberly-Clark Worldwide, Inc. Soft and durable tissue products containing a softening agent
DE102006034186A1 (de) * 2006-07-24 2008-01-31 Siemens Ag Einrichtung zur Papierherstellung, insbesondere Altpapier
FR2918678A1 (fr) * 2007-07-13 2009-01-16 Arjowiggins Licensing Soc Par Procede de traitement des eaux blanches provenant d'une machine de type machine a papier
JP6042161B2 (ja) * 2012-10-04 2016-12-14 有限会社エムエスエンジニアリング 固液分離装置
CN104562825B (zh) * 2013-10-18 2017-06-13 上海东冠纸业有限公司 一种高效的白水盘排污装置
CN106758476B (zh) * 2017-03-21 2018-03-09 李飞 一种制浆造纸白水的封闭循环系统及处理方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003023A1 (en) * 1985-11-06 1987-05-21 Sunds Defibrator Aktiebolag Method of processing waste paper

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053496A (de) * 1900-01-01
GB280456A (en) * 1927-05-30 1927-11-17 John Stanley Hancock Improved method of and means for preparing a wet mixture of fibre and cementitious material
GB526866A (en) * 1939-03-27 1940-09-26 August Reiss Improvements in and relating to treatment of waste water in the manufacture of paper
US3415253A (en) * 1967-01-13 1968-12-10 Philip Morris Inc Process for manufacturing reconstituted tobacco sheet material in a substantially closed system
CH560651A5 (de) * 1973-10-04 1975-04-15 Stoecklin & Cie
ES2023626T3 (es) * 1989-10-10 1994-07-01 Nils Anders Lennart Wikdahl Metodo y dispositivo para la produccion de pulpa de celulosa de calidad mejorada.
US5196090A (en) * 1989-11-03 1993-03-23 Glauco Corbellini Method for recovering pulp solids from whitewater using a siphon

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003023A1 (en) * 1985-11-06 1987-05-21 Sunds Defibrator Aktiebolag Method of processing waste paper

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI,nŸ 91-079108,Derwent Publications Ltd,London,GB; & SE-A-8902087(ABB ATOM) *The entire abstract* *
DATABASE WPI,nŸ 94-239403,Derwent Publications Ltd,London,GB; & JP-A-6173183(MITSUBISHI PAPER MILLS) *The entire abstract* *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998041684A1 (en) * 1997-03-18 1998-09-24 Valmet Corporation System for treatment and circulation of dilution water for the headbox of a paper machine
US6423183B1 (en) 1997-12-24 2002-07-23 Kimberly-Clark Worldwide, Inc. Paper products and a method for applying a dye to cellulosic fibers
WO2002053831A1 (en) * 2000-12-19 2002-07-11 Metso Paper, Inc. Method for removing air from the tail water reservoir of a paper machine and a corresponding tail water reservoir
US6582560B2 (en) 2001-03-07 2003-06-24 Kimberly-Clark Worldwide, Inc. Method for using water insoluble chemical additives with pulp and products made by said method
WO2012097938A1 (de) * 2011-01-17 2012-07-26 Voith Patent Gmbh Papiermaschine
KR101330831B1 (ko) * 2011-12-30 2013-11-18 김용철 절전형 펄프 회수장치
WO2016041773A1 (de) * 2014-09-18 2016-03-24 Voith Patent Gmbh Verfahren und vorrichtung zur herstellung eines vliesstoffes

Also Published As

Publication number Publication date
DE69407007D1 (de) 1998-01-08
ATE160602T1 (de) 1997-12-15
FI943895A (fi) 1995-02-28
CA2130712A1 (en) 1995-02-28
DE69407007T2 (de) 1998-04-16
ZA946261B (en) 1995-07-05
BR9403343A (pt) 1995-08-08
GB2281319A (en) 1995-03-01
FI943895A0 (fi) 1994-08-24
JPH07207592A (ja) 1995-08-08
IE940642A1 (en) 1995-03-08
GB9416214D0 (en) 1994-10-05
GB2281319B (en) 1997-03-05
EP0643164B1 (de) 1997-11-26
FI114872B (fi) 2005-01-14
GB9317817D0 (en) 1993-10-13
AU7031494A (en) 1995-03-09
AU667015B2 (en) 1996-02-29
NZ264280A (en) 1995-10-26

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