EP0733735A2 - Partie humide d'une machine à papier - Google Patents

Partie humide d'une machine à papier Download PDF

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Publication number
EP0733735A2
EP0733735A2 EP96102508A EP96102508A EP0733735A2 EP 0733735 A2 EP0733735 A2 EP 0733735A2 EP 96102508 A EP96102508 A EP 96102508A EP 96102508 A EP96102508 A EP 96102508A EP 0733735 A2 EP0733735 A2 EP 0733735A2
Authority
EP
European Patent Office
Prior art keywords
lines
white water
machine
water
consistency
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
EP96102508A
Other languages
German (de)
English (en)
Other versions
EP0733735A3 (fr
EP0733735B1 (fr
Inventor
Ulrich Begemann
Dirk Thomas
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.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
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 Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0733735A2 publication Critical patent/EP0733735A2/fr
Publication of EP0733735A3 publication Critical patent/EP0733735A3/fr
Application granted granted Critical
Publication of EP0733735B1 publication Critical patent/EP0733735B1/fr
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
    • 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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a wet end of a paper machine according to the preamble of claim 1.
  • the most important quality requirements relate to the fiber orientation in the material jet leaving the outlet nozzle and thus in the paper web after its completion, as well as the basis weight profile, i.e. the distribution of the basis weight transversely to the running direction of the paper web as well as lengthways to it.
  • White water is preferably used as the dilution water, ie the water which is separated from the fibrous materials in the sheet formation process. This white water is collected in a collecting trough, the so-called screen ship, from where it reaches a white water chest of relatively large volume.
  • the use of white water is cheaper than the use of fresh water for various reasons. This means saving fresh water.
  • the valuable fibers and fillers still contained in the white water are reused.
  • connecting lines are provided which provide a conductive connection between the Establish the white water chest and the partial flow lines to the flow chamber.
  • the invention has for its object to design a wet end according to the preamble of claim 1 such that fluctuations in basis weight are largely suppressed.
  • the dilution water line is instead connected directly to the collecting trough, this means that when the retention and thus the consistency of the dilution water obtained change, the dilution water reaches the partial flow lines directly, with the "correct" consistency.
  • FIG. 1 A wet section of a paper machine is shown there. The following elements can be seen in FIG. 1:
  • a distributor 1 with a vertical longitudinal axis has a connection 1.1 for supplying a main stream of a stock suspension. This main stream comes from a stock preparation system, not shown here.
  • the distributor has a circular cross section.
  • the distributor 1 also has a multiplicity of connections which are located in one and the same plane. In the present case, only the connections 1.2 and 1.3 can be seen.
  • a hose line is led from each connection - see hose lines 1.22, 1.33, 1.44 and 1.55. These hose lines lead to a machine-wide flow chamber 2. This has corresponding connecting pieces 2.2, 2.3, 2.4 and 2.5, and - on the outlet side - an outlet nozzle 2.1. See also Figure 2.
  • hose lines 1.22, 1.33, 1.44 and 1.55 are considerably more numerous than shown here, and they expediently all have the same length.
  • the inlet ports to the nozzle chamber 2 are in turn in one and the same horizontal plane. They are preferably at the same mutual distance.
  • the inside of the nozzle chamber 2 can have dividing walls, which are only shown in broken lines here, and which lie in vertical planes. If they are provided, they either extend over the entire length of the nozzle chamber 2 or only over a part thereof.
  • the wire section 3 comprises in a known manner a fourdrinier wire 3.1, a breast roller 3.2, a deflection roller 3.3 and a plurality of guide rollers 3.4.
  • the white water is known to be used to dilute the main stream of the stock suspension. In the present case, according to the invention, it is discharged from the collecting trough at a very specific point - see connection point 4.1. The removal takes place by means of a pump 6 to which a pressure line 6.1 is connected.
  • the pressure line 6.1 branches into lines 6.2, 6.3, 6.4 and 6.5.
  • Line 6.2 opens into hose line 1.22, line 6.3 into hose line 1.33, line 6.4 into hose line 1.44 and line 6.5 into hose line 1.55.
  • the branching lines of the white water namely the lines 6.2, 6.3, 6.4 and 6.5, contain valves with which the inflow of the white water serving for dilution to the hose lines 1.22, 1.33, 1.44 and 1.55 can be regulated Way can be set.
  • valves can also be provided in the hose lines. The individual partial streams guided in the hose lines thus reach the flow chamber 2, whereby they have exactly the right fiber content.
  • connection point 4.2 Due to the location of the connection point 4.2, the white water is led to the consumption points in a very narrow circuit according to the invention.
  • the regulation is very quick, i.e. without great time lag, so that one could speak of a dynamic self-regulating effect.
  • the dilution water lines and / or the partial flow lines of the main and / or mixture flow have connections for introducing chemicals, such as retention aids, or of additional fiber suspensions or suspensions containing fine particles.
  • retention agent is added in accordance with the second main claim, this occurs for the following reasons: the retention agent must preferably be associated with those constituents which have poor retention behavior; In the white water stream, there are particularly high levels of fines and fillers.
  • the retention agent is preferably added in the ratio of the fine and fillers in the main stream and in the dilution stream in the main and dilution water stream.
  • the invention can be used in wet sections in which two or more distributors are assigned to a single nozzle chamber, in a multi-layer headbox. It is also possible to apply the invention to multi-layer headboxes in which a first layer of fibrous material is first formed, onto which a second layer is placed, produced by a secondary headbox, etc.

Landscapes

  • Paper (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP96102508A 1995-03-20 1996-02-20 Partie humide d'une machine à papier Expired - Lifetime EP0733735B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19509522A DE19509522C2 (de) 1995-03-20 1995-03-20 Naßpartie einer Papiermaschine
DE19509522 1995-03-20

Publications (3)

Publication Number Publication Date
EP0733735A2 true EP0733735A2 (fr) 1996-09-25
EP0733735A3 EP0733735A3 (fr) 1998-01-14
EP0733735B1 EP0733735B1 (fr) 2001-01-24

Family

ID=7756830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102508A Expired - Lifetime EP0733735B1 (fr) 1995-03-20 1996-02-20 Partie humide d'une machine à papier

Country Status (4)

Country Link
US (1) US5958189A (fr)
EP (1) EP0733735B1 (fr)
AT (1) ATE198917T1 (fr)
DE (2) DE19509522C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998024973A1 (fr) * 1996-12-06 1998-06-11 Eka Chemicals Ab Procede de fabrication de papier
WO1998041684A1 (fr) * 1997-03-18 1998-09-24 Valmet Corporation Systeme de traitement et de circulation de l'eau de dilution pour la caisse de tete d'une machine a papier
EP0989230A1 (fr) * 1998-09-24 2000-03-29 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour tenir propre ou pour nettoyer le conduit de la faible consistance d'un système de caisse de tête

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627669C2 (de) * 1996-07-10 2001-03-01 Stora Enso Publication Paper A Verfahren zur Verbesserung von Druckpapieren
FI115646B (fi) * 1996-11-26 2005-06-15 Metso Paper Inc Paperikoneen/kartonkikoneen monikerrosperälaatikko
DE19736047A1 (de) * 1997-08-20 1999-02-25 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zur Steuerung oder Regelung des Flächengewichts einer Papier- oder Kartonbahn
FI103822B (fi) * 1998-06-16 1999-09-30 Valmet Corp Menetelmä flokkisuuden optimoimiseksi
DE19859770A1 (de) * 1998-06-29 1999-12-30 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zum Mischen von Sroffsuspension
ATE262611T1 (de) 1998-06-29 2004-04-15 Voith Paper Patent Gmbh Verfahren und vorrichtung zur durchmissung von faserstoffsuspensionen
DE19830600A1 (de) 1998-07-09 2000-01-13 Voith Sulzer Papiertech Patent Misch- und Rezirkulationskreislauf
FI116078B (fi) 1998-12-30 2005-09-15 Metso Paper Inc Menetelmä massan syöttämiseksi perälaatikkoon
DE19922817A1 (de) * 1999-05-19 2000-11-23 Voith Sulzer Papiertech Patent Vorrichtung und Verfahren zur Steuerung oder Regelung des Flächengewichts einer Papier- oder Kartonbahn
US6270625B1 (en) * 1999-06-29 2001-08-07 The Mead Corporation Method for manufacturing colored stripped paper
DE29916787U1 (de) * 1999-09-23 1999-12-30 Voith Sulzer Papiertech Patent Vorrichtung zum Führen von an einer Papiermaschine anfallendem Siebwasser
FI109712B (fi) * 2000-09-14 2002-09-30 Metso Paper Inc Menetelmä ja laitteisto massan fraktioinnissa paperi- tai kartonkikoneessa
PL1987329T3 (pl) * 2006-02-01 2011-12-30 Astenjohnson Inc Skrzynia przelewowa i system dostarczania surowca w maszynie do produkcji papieru
US8715466B1 (en) * 2012-10-19 2014-05-06 Theodore Caouette Method and system for reducing water loss in a paper mill

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239647A1 (de) * 1992-11-26 1994-06-01 Voith Gmbh J M Verfahren und Vorrichtung zur Vergleichmäßigung des Flächengewichtsquerprofils mittels Siebkreislaufsektionierung
EP0600251A1 (fr) * 1992-11-05 1994-06-08 J.M. Voith GmbH Procédé pour uniformiser la composition d'un bande de papier

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296066A (en) * 1963-11-13 1967-01-03 Black Clawson Co Headbox for papermaking machine and stock distributor thereto
GB1179847A (en) * 1966-09-01 1970-02-04 St Annes Board Mill Co Ltd Flowbox
US4021295A (en) * 1975-05-05 1977-05-03 Beloit Corporation Method and apparatus for supplying white water from a single silo in the formation of a multi-ply web
DE3028186C2 (de) * 1980-07-25 1982-07-08 J.M. Voith Gmbh, 7920 Heidenheim Stoffauflauf für Papiermaschinen
SE428811B (sv) * 1981-12-03 1983-07-25 Karlstad Mekaniska Ab Forfarande och anordning for framstellning av en flerskiktad pappersbana
DE4211291C3 (de) * 1992-04-03 2001-06-07 Voith Gmbh J M Mischeinrichtung und Verfahren zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
DE4402273C2 (de) * 1994-01-27 1995-11-23 Voith Gmbh J M Papiermaschine zur Herstellung mehrlagiger Papierbahnen
US5505819A (en) * 1994-03-31 1996-04-09 Macmillan Bloedel Limited Neutral papermaking

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0600251A1 (fr) * 1992-11-05 1994-06-08 J.M. Voith GmbH Procédé pour uniformiser la composition d'un bande de papier
DE4239647A1 (de) * 1992-11-26 1994-06-01 Voith Gmbh J M Verfahren und Vorrichtung zur Vergleichmäßigung des Flächengewichtsquerprofils mittels Siebkreislaufsektionierung

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998024973A1 (fr) * 1996-12-06 1998-06-11 Eka Chemicals Ab Procede de fabrication de papier
AU723127B2 (en) * 1996-12-06 2000-08-17 Eka Chemicals Ab A process for the production of paper
US6113741A (en) * 1996-12-06 2000-09-05 Eka Chemicals Ab Process for the production of paper
CN1094540C (zh) * 1996-12-06 2002-11-20 埃卡化学公司 一种造纸方法
EP1586705A1 (fr) * 1996-12-06 2005-10-19 Eka Chemicals AB Procédé de production de papier
NO326717B1 (no) * 1996-12-06 2009-02-02 Eka Chemicals Ab Fremgangsmåte ved fremstilling av papir
WO1998041684A1 (fr) * 1997-03-18 1998-09-24 Valmet Corporation Systeme de traitement et de circulation de l'eau de dilution pour la caisse de tete d'une machine a papier
EP0989230A1 (fr) * 1998-09-24 2000-03-29 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour tenir propre ou pour nettoyer le conduit de la faible consistance d'un système de caisse de tête
US6214170B1 (en) 1998-09-24 2001-04-10 Voith Sulzer Papiertechnik Patent Gmbh Process for cleaning or maintaining the cleanliness of the low-consistency branch of a headbox system

Also Published As

Publication number Publication date
DE19509522C2 (de) 1999-03-11
ATE198917T1 (de) 2001-02-15
DE59606354D1 (de) 2001-03-01
DE19509522A1 (de) 1996-09-26
EP0733735A3 (fr) 1998-01-14
US5958189A (en) 1999-09-28
EP0733735B1 (fr) 2001-01-24

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