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 PDFInfo
- 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
Links
- 239000012530 fluid Substances 0.000 title description 2
- 239000000203 mixture Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 11
- 239000012895 dilution Substances 0.000 description 10
- 238000010790 dilution Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
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.
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)
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)
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)
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 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE551386C (de) * | 1929-02-17 | 1932-05-30 | Gustav Kaemmerer | Mischer fuer Stoffdichteregler |
US1947329A (en) * | 1930-10-16 | 1934-02-13 | Bastian Blessing Co | Faucet |
US2802648A (en) * | 1953-12-01 | 1957-08-13 | Lockheed Aircraft Corp | Proportioning and mixing fluid dispensing device |
US2894732A (en) * | 1955-09-29 | 1959-07-14 | Shell Dev | Fluid mixing device |
US4018426A (en) * | 1976-03-17 | 1977-04-19 | Petrolite Corporation | System for producing emulsions |
US4074363A (en) * | 1976-09-17 | 1978-02-14 | Ric-Wil, Incorporated | Apparatus for generating plastic foam |
US4302113A (en) * | 1980-04-11 | 1981-11-24 | Eastman Kodak Company | Method and apparatus for admixing photographic processing compositions |
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 |
-
1992
- 1992-04-03 DE DE4211291A patent/DE4211291C3/de not_active Expired - Fee Related
-
1993
- 1993-03-25 EP EP93104916A patent/EP0565923B1/fr not_active Revoked
- 1993-03-25 DE DE59301614T patent/DE59301614D1/de not_active Revoked
- 1993-03-25 AT AT93104916T patent/ATE134232T1/de not_active IP Right Cessation
- 1993-04-02 US US08/042,158 patent/US5316383A/en not_active Expired - Lifetime
- 1993-04-02 FI FI931508A patent/FI112388B/fi active
- 1993-04-02 JP JP07689193A patent/JP3254035B2/ja not_active Expired - Fee Related
- 1993-04-05 CA CA002093366A patent/CA2093366A1/fr not_active Abandoned
Patent Citations (3)
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)
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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