EP0565923A1 - Mélangeur pour le mélange de deux fluides, produisant un courrant de volume constant, pour l'alimentation de la caisse de tête d'une machine à papier - Google Patents

Mélangeur pour le mélange de deux fluides, produisant un courrant de volume constant, pour l'alimentation de la caisse de tête d'une machine à papier Download PDF

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Publication number
EP0565923A1
EP0565923A1 EP93104916A EP93104916A EP0565923A1 EP 0565923 A1 EP0565923 A1 EP 0565923A1 EP 93104916 A EP93104916 A EP 93104916A EP 93104916 A EP93104916 A EP 93104916A EP 0565923 A1 EP0565923 A1 EP 0565923A1
Authority
EP
European Patent Office
Prior art keywords
volume flow
mixing
mixing device
flow
partial volume
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
EP93104916A
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German (de)
English (en)
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EP0565923B1 (fr
Inventor
Ulrich Begemann
Thoröe Scherb
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 Sulzer Papiermaschinen GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
JM Voith GmbH
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Application filed by Voith Sulzer Papiermaschinen GmbH, JM Voith GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0565923A1 publication Critical patent/EP0565923A1/fr
Application granted granted Critical
Publication of EP0565923B1 publication Critical patent/EP0565923B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence section
    • 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 mixing device for mixing two liquids at a constant mixture volume flow to supply the headbox of a paper machine.
  • a mixing device according to the preamble of claim 1 is known from DE-PS 40 05 281 (Fig.3).
  • a mixing device for achieving the same purpose and is known from the German utility model application G 91 04 609.
  • a mixing device is presented which also serves to mix several partial volume flows in such a way that a constant mixture volume flow is created.
  • a state-of-the-art concept is to section the headbox over the working width and to supply the individual sections with suspensions of different material densities. As the material density of a section increases, the basis weight of the paper web increases at this point and vice versa.
  • the fiber orientation of the paper web is a function of the angle at which the jet emerges from the headbox
  • the fiber orientation can be influenced in a targeted manner by changing the headbox geometry, for example in the form of geometry changes at the exit gap.
  • Geometry changes on the headbox influence the to different degrees, depending on the point of action Amount of suspension released from the headbox in the associated section. This has the consequence that, in the above-described conception, the basis weight at the point of engagement of the paper web also changes unintentionally when there is an intervention in the fiber orientation profile.
  • the variation of the material densities in the individual sections can be achieved by assigning a mixer to each section, in which two partial volume flows of different material density are mixed with one another, and the mixture volume flow is fed exclusively to the corresponding section of the headbox.
  • An indispensable prerequisite for not changing the fiber orientation of the section when changing the consistency is the absolute constancy of the mixture volume flow irrespective of the partial volume flow ratio set on the mixer.
  • Another concept for influencing the fiber orientation and surface cross-section provides for the mixture volume flow and the consistency to be changed in a locally restricted manner.
  • the effect of the mixture volume flow change on fiber orientation is based on the relationships described above.
  • the weight per unit area is adjusted by changing the consistency, whereby in this concept, too, the demand for absolute consistency of the mixture volume flow in the case of changes in consistency remains, so as not to influence the fiber orientation profile at the same time as changes in consistency.
  • a valve can be installed in the mixture volume flow as an actuator for fiber orientation adjustment.
  • the invention has for its object to design a structurally simple, inexpensive and reliable mixing device such that the mixture volume flow c, regardless of the size of the partial volume flow b, remains constant around the basis weight and fiber orientation cross profile of a paper web largely independent of one another and locally narrowly limited influence and to avoid the aforementioned disadvantages of the prior art.
  • an essential idea of the invention is to combine two opposing effects of fluid mechanics so that the sum of two partial volume flows a and b entering a mixer always remains constant, regardless of the ratio of the partial volume flows to one another and with a low pressure drop across the mixer.
  • the mixture volume flow c decreases, which is due to the increase in turbulence at the mixing point. This corresponds to the negative effect.
  • the inventors have now recognized that a combination of both effects can be achieved by skillfully selecting the angles ⁇ and ⁇ in such a way that the decrease in the mixture volume flow due to turbulence at the mixing point is exactly compensated for by the Venturi effect. I.e. the same mixture volume flows are always obtained regardless of the partial volume flow ratio.
  • the solid curve III in FIG. 1 shows the relationships measured on a real mixer. Turbulence and Venturi effect are the same in their effect on the mixture volume flow with a suitable choice of the angle over a large operating range, as shown in FIG. 1.
  • the angle of the equilibrium state is a function of the mixer geometry.
  • a prerequisite for the constancy of the mixture volume flow is the existence of the flow resistance W in the course of the discharge line C and further that the inlet pressure of the partial volume flow a in which no actuator is located and the outlet pressure of the mixer is kept constant.
  • the idea according to the invention is to make the energy exchange between the partial volume flows at the mixing point leading to acceleration or deceleration by a suitable choice of the angle of the partial volume flows to one another and the pipe diameter so large that the mixture volume flow is always constant regardless of the partial volume flow ratio.
  • the fact that the inlet pressure of a partial volumetric flow and the outlet pressure of the mixture volumetric flow must be constant does not represent a restriction for the operation of the mixing device on a paper machine, since steady pressure fields are always sought in the distribution system before the headbox and in the headbox in order to ensure constant paper properties .
  • the existing problem can therefore be solved by using a single valve which is specially adapted to the properties of the fiber suspension and which controls a partial volume flow of low material density.
  • the design of the supply and discharge lines described can take any cross-sectional shape.
  • FIG. 1 shows the measurement results of a mixing device corresponding to that shown in FIG. 2.
  • the partial volume flow ratio a / b is plotted on the abscissa, and the mixture volume flow c is shown on the ordinate.
  • Fig. 2 shows a mixing device according to claim 2.
  • supply line B also a straight supply line, is added at a mixing angle.
  • An actuator S is installed in the feed line B and regulates the size of the partial volume flow b.
  • the partial volume flow b is led through the actuator via the supply line B to the mixing chamber M, in that the partial volume flow a coming through the supply line A meets the partial volume flow b and is discharged as a mixture volume flow c through the discharge line C.
  • a flow resistance W is further stylized in the derivation C, which contains a necessary prerequisite for the functioning of the mixing device.
  • Fig. 3 shows a mixing device as described under Fig. 1, however, in addition to the built-in the partial volume flow control device S1 there is a further control device S2, which is installed in the course of the derivative C following the flow resistance W.
  • Fig. 4 shows a mixing device, as described in Fig. 3, however, in addition, in the derivative C built-in resistor W1 a second flow resistance W2 is installed in the course of the feed line A.
  • Fig. 5 shows a mixing device similar to Fig. 2, but this time the lines are not in one plane, but are spatially arranged.
  • Part a of FIG. 5 shows a top view, in which the angle ⁇ , the angle between A and C is shown, and part b shows the mixing device in a side view.
EP93104916A 1992-04-03 1993-03-25 Mélangeur pour le mélange de deux fluides, produisant un courrant de volume constant, pour l'alimentation de la caisse de tête d'une machine à papier Revoked EP0565923B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4211291A DE4211291C3 (de) 1992-04-03 1992-04-03 Mischeinrichtung und Verfahren zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
DE4211291 1992-04-03

Publications (2)

Publication Number Publication Date
EP0565923A1 true EP0565923A1 (fr) 1993-10-20
EP0565923B1 EP0565923B1 (fr) 1996-02-14

Family

ID=6456041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93104916A Revoked EP0565923B1 (fr) 1992-04-03 1993-03-25 Mélangeur pour le mélange de deux fluides, produisant un courrant de volume constant, pour l'alimentation de la caisse de tête d'une machine à papier

Country Status (7)

Country Link
US (1) US5316383A (fr)
EP (1) EP0565923B1 (fr)
JP (1) JP3254035B2 (fr)
AT (1) ATE134232T1 (fr)
CA (1) CA2093366A1 (fr)
DE (2) DE4211291C3 (fr)
FI (1) FI112388B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6303001B1 (en) 1998-09-24 2001-10-16 Voith Sulzer Papiertechnik Patent Gmbh Process for improving the shrinkage cross direction profile and paper having an improved cross
EP1422337A1 (fr) * 2002-09-27 2004-05-26 Voith Paper Patent GmbH Caisse de tête avec dispositif de dosage

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI92230C (fi) * 1993-07-01 1994-10-10 Valmet Paper Machinery Inc Menetelmä monikerrosperälaatikon säädössä ja monikerrosperälaatikko
FI100894B (fi) * 1993-07-01 1998-03-13 Valmet Paper Machinery Inc Menetelmä ja laite perälaatikon säädössä
EP0635599B1 (fr) * 1993-07-01 2002-01-23 Metso Paper, Inc. Procédé et dispositif pour la régulation d'une caisse de tête
FI92229C (fi) * 1993-07-01 1994-10-10 Valmet Paper Machinery Inc Menetelmä ja laite perälaatikon säädössä
DE4323263C2 (de) * 1993-07-12 2001-11-29 Voith Paper Patent Gmbh Verfahren zur sektionalen Beeinflussung der Stoffdichte und der Faserorientierung in einem Stoffauflauf einer Papiermaschine und Stoffauflauf zur Durchführung des Verfahrens
DE4422907C2 (de) 1994-06-30 1997-03-06 Voith Gmbh J M Sektionale Stoffzuführung des Stoffauflaufs einer Papiermaschine
US5510005A (en) * 1994-07-25 1996-04-23 Westvaco Corporation Venturi headbox for a papermaking machine
DE4433445C1 (de) 1994-09-20 1996-03-28 Voith Gmbh J M Stoffauflauf einer Papiermaschine
DE4435860C2 (de) * 1994-10-07 1998-03-19 Voith Gmbh J M Stoffauflauf zur Erzeugung einer mehrschichtigen Papierbahn
DE4440079C2 (de) * 1994-11-10 1997-10-02 Voith Sulzer Papiermasch Gmbh Mehrschichten-Stoffauflauf
DE19509522C2 (de) * 1995-03-20 1999-03-11 Voith Sulzer Papiermasch Gmbh Naßpartie einer Papiermaschine
US6406595B1 (en) * 1995-10-20 2002-06-18 Institute Of Paper Science And Technology, Inc. Methods and apparatus to enhance paper and board forming qualities
US5853545A (en) * 1996-03-08 1998-12-29 Valmet-Karlstad Ab Arrangement for feeding stock to a headbox in a papermaking machine
SE506322C2 (sv) * 1996-03-08 1997-12-01 Valmet Karlstad Ab Anordning för matning av mäld till en inloppslåda i en pappersmaskin
US6113741A (en) * 1996-12-06 2000-09-05 Eka Chemicals Ab Process for the production of paper
US5779355A (en) * 1997-02-27 1998-07-14 Roger H. Woods Limited Mixing apparatus venturi coupled multiple shear mixing apparatus for repairing a liquid-solid slurry
DE19728599A1 (de) * 1997-07-04 1999-01-07 Voith Sulzer Papiermasch Gmbh Stoffauflauf
DE19733454A1 (de) 1997-08-02 1999-02-04 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Erkennung und Korretur einer Faserorientierungs-Querprofil-Veränderung
DE19736048A1 (de) * 1997-08-20 1999-02-25 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zur Steuerung oder Regelung eines Bahneigenschaftsprofils
US6117272A (en) * 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
DE19843727A1 (de) 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Verfahren und Stoffauflaufsystem zur Verbesserung des Konsistenzquerprofils einer Faserbahn
FI116078B (fi) * 1998-12-30 2005-09-15 Metso Paper Inc Menetelmä massan syöttämiseksi perälaatikkoon
DE19908298A1 (de) * 1999-02-26 2000-08-31 Voith Sulzer Papiertech Patent Stoffauflauf mit Dosierelement
DE19908898A1 (de) 1999-03-02 2000-09-07 Voith Sulzer Papiertech Patent Verfahren zur Zudosierung eines fluiden Mediums in einen Suspensionsstrom eines Stoffauflaufes und Stoffauflauf
US6227696B1 (en) * 1999-03-31 2001-05-08 J.H. Horne & Sons Company Radial diffuser
FI114030B (fi) * 1999-10-12 2004-07-30 Metso Paper Inc Menetelmä ja sovitelma paperinvalmistuksen massakomponenttien sekoittamiseksi
FI116147B (fi) 2001-02-21 2005-09-30 Metso Paper Inc Järjestely paperinvalmistusprosessin virtausten sekoittamiseksi
WO2002072250A1 (fr) * 2001-02-21 2002-09-19 Metso Paper Inc Ensemble pour melanger des courants dans un processus de fabrication du papier
ZA200508659B (en) * 2003-05-09 2007-03-28 Akzo Nobel Nv A process for the production of paper
FI116473B (fi) * 2004-07-16 2005-11-30 Wetend Technologies Oy Menetelmä ja laitteisto kemikaalien syöttämiseksi prosessinestevirtaan
CN101589296B (zh) * 2006-02-01 2015-04-22 美商艾斯登强生股份有限公司 造纸机送浆系统及浆料的定量黏度规划方法
FI119559B (fi) * 2007-06-01 2008-12-31 Upm Kymmene Corp Menetelmä massan käsittelemiseksi
US7871493B2 (en) * 2008-06-26 2011-01-18 Kimberly-Clark Worldwide, Inc. Environmentally-friendly tissue
DE102009014268B3 (de) 2009-03-20 2010-04-08 Andritz Küsters Gmbh Anordnung an Papiermaschinen zur Einstellung eines Flächengewichts-Querprofils
HUE031720T2 (en) * 2009-05-26 2017-07-28 Eurogentec Sa Method and means for the preparation and / or purification of polynucleotides and products thereof
DE102009047041A1 (de) 2009-11-24 2011-05-26 Voith Patent Gmbh Verfahren zur Steuerung/Regelung der mittleren Gesamtmenge, insbesondere Gesamtvolumenstroms an Verdünnungsmedium
CN106758471B (zh) * 2017-02-09 2018-05-15 华南理工大学 一种改变稀释水浓度调节纸张横幅定量的装置及方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1571410A (fr) * 1967-04-15 1969-06-20
EP0462472A1 (fr) * 1990-06-20 1991-12-27 J.M. Voith GmbH Caisse de tête de machines à papier
DE9115296U1 (de) * 1991-12-10 1992-03-19 J.M. Voith Gmbh, 7920 Heidenheim Stoffauflauf

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US4018426A (en) * 1976-03-17 1977-04-19 Petrolite Corporation System for producing emulsions
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FR2631353A1 (fr) * 1988-05-13 1989-11-17 Semti Dispositif d'alimentation en melange pateux
DE4005281C2 (de) * 1990-02-20 1995-04-06 Schultz Hans Joachim Dr Ing Stoffauflauf mit Regelung des Flächengewicht-Querprofiles über die Verdünnung der Fasersuspension
FI901593A (fi) * 1990-03-30 1991-10-01 Tampella Oy Ab Foerfarande vid en pappers- eller kartongmaskin foer reglering av ur inloppslaodan loepande massa samt inloppslaoda foer en papperseller kartongmaskin.
DE9104609U1 (de) * 1991-04-16 1991-05-29 J.M. Voith Gmbh, 7920 Heidenheim Ventileinrichtung für die Papierindustrie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1571410A (fr) * 1967-04-15 1969-06-20
EP0462472A1 (fr) * 1990-06-20 1991-12-27 J.M. Voith GmbH Caisse de tête de machines à papier
DE9115296U1 (de) * 1991-12-10 1992-03-19 J.M. Voith Gmbh, 7920 Heidenheim Stoffauflauf

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6303001B1 (en) 1998-09-24 2001-10-16 Voith Sulzer Papiertechnik Patent Gmbh Process for improving the shrinkage cross direction profile and paper having an improved cross
EP1422337A1 (fr) * 2002-09-27 2004-05-26 Voith Paper Patent GmbH Caisse de tête avec dispositif de dosage

Also Published As

Publication number Publication date
CA2093366A1 (fr) 1993-10-04
JP3254035B2 (ja) 2002-02-04
EP0565923B1 (fr) 1996-02-14
FI931508A (fi) 1993-10-04
DE4211291C2 (de) 1994-07-07
US5316383A (en) 1994-05-31
DE59301614D1 (de) 1996-03-28
DE4211291A1 (de) 1993-10-07
DE4211291C3 (de) 2001-06-07
JPH0610289A (ja) 1994-01-18
ATE134232T1 (de) 1996-02-15
FI112388B (fi) 2003-11-28
FI931508A0 (fi) 1993-04-02

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