EP0681057B1 - Mehrschichten-Stoffauflauf - Google Patents
Mehrschichten-Stoffauflauf Download PDFInfo
- Publication number
- EP0681057B1 EP0681057B1 EP95106390A EP95106390A EP0681057B1 EP 0681057 B1 EP0681057 B1 EP 0681057B1 EP 95106390 A EP95106390 A EP 95106390A EP 95106390 A EP95106390 A EP 95106390A EP 0681057 B1 EP0681057 B1 EP 0681057B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slat
- flow
- flowbox
- turbulence
- region
- 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.)
- Expired - Lifetime
Links
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
- D21F1/028—Details of the nozzle 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
- D21F1/02—Head boxes of Fourdrinier machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
Definitions
- the invention relates to a multi-layer headbox as part of a Machine for producing a multilayer fibrous web, especially paper web.
- a multi-layer headbox is used for independent loading of the individual nozzle spaces with material suspensions to produce a multi-layer paper web.
- a lamella is provided between two adjacent nozzle spaces to avoid premature mixing of the different material suspensions until they are brought together outside the nozzle space.
- Document (1) discloses a lamella in the form of an inherently rigid partition which has a pivot axis at its upstream end, on which an adjusting device engages.
- Document (1) discloses a lamella in the form of an inherently rigid partition which has a pivot axis at its upstream end, on which an adjusting device engages.
- This known construction is intended to enable material flows to be fed to the individual nozzle chambers at mutually independent speeds and pressures.
- the outlet gaps of the individual nozzle chambers should be adjustable independently of one another.
- the slats have the task of neighboring Separate material flows in a multi-layer headbox so that no mixing of the different currents come, until finally the currents in as undisturbed form as possible be united in a single flow, at the same time if possible no disturbances in this flow, e.g. by fluttering the Lamella (s) may occur.
- the end of the Slats since this area is also very often the origin of Forms flow disturbances. To avoid these flow disorders different approaches have been taken.
- Document (3) was in Document (3) proposed to design the slats so that a increased convergence in the exit area of the nozzle arises in order to thereby the increase in flow velocity in this area Achieve reduction in disturbances due to turbulence.
- Document (5) shows a headbox of a machine for manufacturing a multilayer fibrous web, which is used for very different Volume flow relationships should enable. It is said by a Slidable joining point of the partition walls just bending of the partition walls can be prevented (page 6, paragraphs 2 and 3).
- Document (6) shows a paper machine headbox with Partitions that have corrugated top and bottom surfaces and to Taper to the end. It should be avoided that this Discard partitions during manufacture or operation or warp (page 5, lines 18-28). However, the free end is supposed to come from one easily deformable material, but this has the disadvantage implies that it tends to vibrate. So it will be exactly one execution contrary to that of the present invention, since the present invention is the execution of the partition walls as flexible plate with one end that does not swing tends (page 4, lines 5-17).
- Document (7) shows a headbox of a paper machine without large pressure loss should be inexpensive to operate. Furthermore, the Possibility are offered, targeted influence on the basis weight cross section and fiber cross section without being able to take to influence the other parameter. So it won't Problem of the quality of the paper web, especially with regard to the even coverage of multilayered webs treated.
- the invention has for its object a multi-layer headbox to represent the high quality of the fibrous web to be produced ensures. High demands are placed on the uniform Coverage of the individual layers and the uniform cross profile of the Fiber web provided. It is important that the cross section both in terms of basis weight as well as in terms of fiber orientation can be set specifically.
- the invention ensures through a design with flexible Slats that are also freely movable on an upstream, transverse to the Direction of flow lying axis are suspended, one automatically pressure equalization between the flow levels. Thereby is achieved that the flow velocities of the individual Align layers well with each other so that unwanted ones Turbulence at the borders can be largely avoided. Exactly same speeds can be achieved in that additional a sectioned suspension flow influence in at least one, preferably middle flow level is introduced. Through the the shear forces between the same speeds Layers almost eliminated and the coverage of the layers optimized. By means of the devices shown in the prior art, one can not achieve such high quality of the fibrous webs.
- claim 1 becomes the main body (or main part) of the Slat formed as a flexible plate so that it does not tend to flutter and still freely between the can adjust two material flows.
- claim 3 is the Lamella at its upstream end freely around a (across axis pivoting to the machine. Also in this case it can move freely between the two Adjust material flows. As a result, they may be the same pressure differences occurring between the two neighboring material flows, so that the Speeds of the two material flows as possible largely align with each other. This results in advantageous way that vortex formation, which their cause in a speed difference between the two Material flows, is avoided.
- an aperture adjustment device also requires that the nozzle the headbox, especially when used in conjunction with twin wire formers, not close enough to the wire can be introduced, whereby an undesirably long, To accept unmanaged material jet is what is quality-reducing especially for multi-layer papers noticeable.
- Nozzle end of the headbox is very simple, this also requires little effort in terms of production technology and also very much due to the elimination of the adjustment devices close to the sieve or between the sieves can be, which in turn has the advantage of being strong shortened, free stream of fabric is obtained. Farther there is also the possibility of the end area of the nozzle to optimize for the flow without on Adjustment options of the cover must be observed.
- the proposed flexible slat can be firmly attached to a component at its upstream end the headbox. However, preference is given provided that the flexible slat can move freely an upstream, transverse to the flow direction hanging axis. Through this suspension ensures that due to the emerging Equalization the flow velocities of the even better align individual layers, whereby - after the neighboring layers meet - at least the unwanted turbulence at the borders is largely avoided.
- the lamella is preferably made of a plastic manufactured.
- the lamella is possible to assemble the lamella from a plastic base body and from a metallic lamella end, it being provided that the difference in the coefficients of thermal expansion is ⁇ 10 -7 1 / K. It is advantageous here that there are no tensions and bends in the lamella, in particular the end region of the lamella, at different temperatures, which would cause an uneven layer thickness transverse profile.
- Figure 1 shows an inventive Three-layer headbox with feeders 1.1, 1.2 and 1.3 to the individual flow levels I, II and III.
- This Feeders can either be through cross distributors or through a variety of individually adjustable material flows be fed.
- a special economic one Design is when the middle layer II with Using a variety of mixing devices (similar to Figure 2) is supplied in a concentration-controlled manner, as a result of which Can easily adjust basis weight.
- the material flows then arrive in an anteroom 2.1, 2.2 and 2.3, from which they generate turbulence Section 3 pass through microturbulence here creates the wall friction effect of a plurality of channels.
- the individual arrive Material suspension flows, through slats 5.1 and 5.2 separated from each other in the nozzle 4 of the headbox.
- the Slats are each on machine-wide axes 6.1 and 6.2 are articulated without torque and thus free themselves according to the flow conditions as described above on.
- the lamellae either consist entirely of plastic or two materials, namely plastic for the base body and metal for the downstream lamella end 5a.
- the plate is flexible, but does not tend to flutter in the flow.
- the plastic preferably has an elastic modulus ⁇ 80,000 N / mm 2 ; the thickness of the plate is approximately on the order of 3 to 12 mm.
- the end of the lamella has a thickness S of at most 0.3, preferably at most 0.1 to 0.2 mm. It can also be seen in the very schematic drawing here that the headbox nozzle, due to the lack of an aperture adjustment, comes very close between the dotted screen guide rollers 7.1, 7.2, as a result of which an extraordinarily short free material jet can be achieved.
- FIG. 2 shows a two-layer headbox, together with a schematically represented pipe system for feeding various fiber suspensions.
- the Nozzle 4 is limited by two in a known manner machine-wide power supply walls 4a and 4b. These are via a known turbulence generator 3 with a middle stationary partition 9 connected. At the outlet end of the partition 9 is again by means of a hinge 6 a slat 5 pivotally attached. Deviating from this, the lamella 5 can also be rigid on the Partition 9 be attached.
- a first main stream, consisting of a first type of paper stock passes over a cross distribution line 11 and branched off from one of them Row of sectional feed lines 13 to one of the two turbulence generators 3.
- Deviating from Figure 2 can in each of the sectional feed lines 13 Volume flow controllers are provided.
- a second Main stream consisting of another Type of paper stock passes through a cross distribution line 12 and across a branched series of sectional ones Feed lines 14, 14 'to the other turbulence generator 3. So that, if necessary, the Basis weight cross-section of the paper web to be produced can be corrected is a third Cross distribution line 15 is provided for supplying a so-called secondary material flow. This consists e.g. out Dilution water or from the second type of paper, but with a different, preferably lower consistency.
- Of the cross distribution line 15 are several sectional Feed lines 16 branched off with a control valve 17 each.
- Each of the lines 16 thus carries a controllable one sectional side stream to a mixing point 18 where it is mixed with one of the sectional main material flows.
- you will Line system 12-17 with the mixing points 18 preferably assign to the middle layer.
- more Feed lines for individually controllable sectional Auxiliary streams could enter the sectional feed lines 13 open for the first main material flow.
Landscapes
- Paper (AREA)
- Magnetic Heads (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
Description
Dokument (1) offenbart eine Lamelle in Form einer in sich steifen Trennwand, die an ihrem stromaufwärtigen Ende eine Schwenkachse aufweist, an der eine Verstelleinrichtung angreift. Diese bekannte Konstruktion soll es ermöglichen, daß den einzelnen Düsenkammern Stoffströme mit voneinander unabhängigen Geschwindigkeiten und Drücken zugeführt werden. Außerdem sollen die Austrittsspalte der einzelnen Düsenkammern voneinander unabhängig einstellbar sein.
- Fig. 1:
- Querschnitt durch einen erfindungsgemäßen Dreischichten-Stoffauflauf.
- Fig. 2:
- Schrägansicht auf einen Zweischichten-Stoffauflauf mit schematisch dargestellten
Claims (11)
- Mehrschichten-Stoffauflauf als Teil einer Maschine zur Erzeugung einer mehrschichtigen Faserstoffbahn, insbesondere Papierbahn, mit den folgenden Merkmalen:1.1 es sind mindestens zwei Faserstoffsuspension führende Strömungsebenen (I, II, III) vorgesehen mit je mindestens einer Zuführeinrichtung (1.1, 1.2, 1.3) für die Faserstoffsuspensionen;1.2 es ist je Strömungsebene ein Abschnitt (3) mit Mitteln vorgesehen, um in der Suspensions-Strömung eine Mikroturbulenz zu erzeugen ("Turbulenzerzeuger");1.3 die Turbulenzerzeuger (3) münden in eine Düse (4), die einen maschinenbreiten Austrittspalt (8) aufweist;1.4 in der Düse (4) befindet sich mindestens eine Lamelle (5; 5.1, 5.2), die zwei benachbarte Suspensionsströme bis in den Bereich des Austrittspaltes (8) voneinander getrennt hält;1.5 die Lamelle (5; 5.1, 5.2) ist vom Bereich des Turbulenzgenerators (3) bis in den Bereich des Austrittsspaltes (8) als eine biegeweiche Platte ausgebildet;1.6 das stromabwärtige Ende der Lamelle (5; 5.1, 5.2) besitzt eine Dicke S von höchstens 0,3 mm;1.7 der Bereich des Austrittsspaltes (8) ist frei von Blenden-Einstellvorrichtungen;1.8 mindestens eine Strömungsebene (I, II, III), vorzugsweise eine mittlere Strömungsebene II, weist eine sektionierte Stoffdichteregelung auf.
- Stoffauflauf nach Anspruch 1, dadurch gekennzeichnet, daß jede Lamelle (5; 5.1, 5.2) an ihrem stromaufwärtigen Ende frei beweglich um eine Achse (6; 6.1, 6.2) gelagert ist, die sich quer zur Strömungsrichtung über die Maschinenbreite erstreckt.
- Mehrschichten-Stoffauflauf als Teil einer Maschine zur Erzeugung einer mehrschichtigen Faserstoffbahn, insbesondere Papierbahn, mit den folgenden Merkmalen:3.1 es sindmindestens zwei Faserstoffsuspension führende Strömungsebenen (I, II, III) vorgesehen mit je mindestens einer Zuführeinrichtung (1.1, 1.2, 1.3) für die Faserstoffsuspensionen;3.2 es ist je Strömungsebene ein Abschnitt (3) mit Mitteln vorgesehen, um in der Suspensions-Strömung eine Mikroturbulenz zu erzeugen ("Turbulenzerzeuger");3.3 die Turbulenzerzeuger (3) münden in eine Düse (4), die einen maschinenbreiten Austrittsspalt (8) aufweist;3.4 in der Düse (4) befindet sich mindestens eine Lamelle (5; 5.1, 5.2), die zwei benachbarte Suspensionsströme bis in den Bereich des Austrittsspaltes (8) voneinander getrennt hält;3.5 die Lamelle (5; 5.1, 5.2) ist an ihrem stromaufwärtigen Ende frei beweglich um eine Achse (6; 6.1, 6.2) gelagert, die sich quer zur Strömungsrichtung über die Maschinenbreite erstreckt;3.6 das stromabwärtige Ende der Lamelle (5; 5.1, 5.2) besitzt eine Dicke S von höchstens 0,3 mm;3.7 der Bereich des Austrittsspaltes (8) ist frei von Blenden-Einstellvorrichtungen;3.8 mindestens eine Strömungsebene (I, II, III), vorzugsweise eine mittlere Strömungsebene II, weist eine sektionierte Stoffdichteregelung auf.
- Stoffauflauf nach Anspruch 3, dadurch gekennzeichnet, daß jede Lamelle (5; 5.1, 5.2) vom Bereich des Turbulenzgenerators (3) bis in den Bereich des Austrittsspaltes (8) als eine biegeweiche Platte ausgebildet ist.
- Stoffauflauf nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das stromabwärtige Ende der Lamelle (5; 5.1, 5.2) eine Dicke S von höchstens 0,1 bis 0,2 mm aufweist.
- Stoffauflauf gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Turbulenzgenerator (3) mindestens einer Strömungsebene (I, II, III) aus einer Vielzahl von in Strömungsrichtung verlaufenden und über die gesamte Maschinenbreite verteilten Kanälen oder Rohren besteht.
- Stoffauflauf nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die sektionierte Stoffdichteregelung durch folgende Merkmale erreicht wird:7.1 es sind über die Maschinenbreite verteilt eine Vielzahl von Stoffsuspensionszufuhrleitungen (14, 14') für mindestens eine Strömungsebene (II) vorgesehen;7.2 es sind Mischer (18) in den Stoffsuspensionszufuhrleitungen vorgesehen, wobei die Mischer die folgenden Merkmale aufweisen:7.3 jeder Mischer (18) besitzt mindestens zwei Zugänge (14, 16) und einen Ausgang (14');7.4 mindestens jeweils einer der Zugänge (16) der Mischer (18) besitzt Mittel (17) zur Durchflußregelung;7.5 die zugeführten Teilströme (Leitungen 12, 15) jedes Mischers (18) besitzen unterschiedliche Eigenschaften.
- Stoffauflauf gemäß Anspruch 7, dadurch gekennzeichnet, daß in mindestens einer stoffdichteregelungsfreien Strömungsebene (I) über die Maschinenbreite verteilt eine Vielzahl von Stoffsuspensionszufuhrleitungen (13) vorgesehen sind.
- Stoffauflauf gemäß einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß jede Lamelle (5; 5.1, 5.2) aus einem Kunststoff gebildet ist.
- Stoffauflauf nach Anspruch 9, dadurch gekennzeichnet, daß jede Lamelle (5; 5.1, 5.2) aus einem Grundkörper aus Kunststoff und aus einem stromabwärtigen metallischen Ende (5a) besteht, wobei der Unterschied der Wärmeausdehnungskoeffizienten < 10-7 1/K beträgt.
- Stoffauflauf gemäß Anspruch 9 oder 10, dadurch gekennzeichnet, daß der E-Modul des Kunststoffs kleiner als 80.000 N/mm2 ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4415053 | 1994-04-29 | ||
DE4415053 | 1994-04-29 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0681057A2 EP0681057A2 (de) | 1995-11-08 |
EP0681057A3 EP0681057A3 (de) | 1997-04-16 |
EP0681057B1 true EP0681057B1 (de) | 2002-08-28 |
Family
ID=6516813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95106390A Expired - Lifetime EP0681057B1 (de) | 1994-04-29 | 1995-04-27 | Mehrschichten-Stoffauflauf |
Country Status (4)
Country | Link |
---|---|
US (1) | US5849159A (de) |
EP (1) | EP0681057B1 (de) |
AT (1) | ATE222971T1 (de) |
DE (1) | DE59510338D1 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6425984B2 (en) * | 1995-10-20 | 2002-07-30 | Institute Of Paper Science And Technology, Inc. | Layered fiber structure in paper products |
FI115646B (fi) * | 1996-11-26 | 2005-06-15 | Metso Paper Inc | Paperikoneen/kartonkikoneen monikerrosperälaatikko |
WO1998051856A1 (en) * | 1997-05-12 | 1998-11-19 | Beloit Technologies, Inc. | A trailing element device |
SE510341C2 (sv) | 1997-08-19 | 1999-05-17 | Sca Research Ab | Metod och anordning för formning av en flerskiktsbana |
AT406171B (de) * | 1998-02-05 | 2000-03-27 | Andritz Patentverwaltung | Vorrichtung zur zufuhr einer faserstoffsuspension auf eine entwässerungseinrichtung |
DE19962709A1 (de) * | 1999-12-23 | 2001-06-28 | Voith Paper Patent Gmbh | Stoffauflauf |
DE10051802A1 (de) * | 2000-10-18 | 2002-04-25 | Voith Paper Patent Gmbh | Lamelle eines Stoffauflaufs einer Papier-, Karton- oder Tissuemaschine |
DE10122047A1 (de) * | 2001-05-07 | 2002-11-14 | Voith Paper Patent Gmbh | Blattbildungsvorrichtung und -verfahren |
US7435369B2 (en) * | 2001-06-06 | 2008-10-14 | Bpb Plc | Method for targeted delivery of additives to varying layers in gypsum panels |
TW593838B (en) * | 2001-06-11 | 2004-06-21 | Sca Hygiene Prod Ab | A patterned paper and a method for manufacturing such |
DE102008000564A1 (de) | 2008-03-07 | 2009-09-10 | Voith Patent Gmbh | Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn |
DE202009013111U1 (de) | 2009-09-30 | 2010-01-07 | Voith Patent Gmbh | Trennelement für einen Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn |
CN116536950A (zh) | 2018-01-05 | 2023-08-04 | 国际纸业公司 | 具有增加的弯曲刚度和横向强度的纸产品及其制造方法 |
DE102018120162A1 (de) * | 2018-08-20 | 2019-10-10 | Voith Patent Gmbh | Stoffauflauf |
CA3172222A1 (en) * | 2020-03-31 | 2021-10-07 | Kimberly-Clark Worldwide, Inc. | Zoned and/or layered substrates and method and apparatus for producing the same |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI58364C (fi) * | 1977-07-13 | 1981-01-12 | Tampella Oy Ab | Matningsanordning foer en banformningsmaskin foer framstaellning av en tvao- eller flerskiktig fiberbana |
AT361772B (de) * | 1977-12-13 | 1981-03-25 | Escher Wyss Gmbh | Stoffauflauf fuer papiermaschinen |
SE421328B (sv) * | 1978-04-25 | 1981-12-14 | Karlstad Mekaniska Ab | Forfarande och anordning for bildande av en flerskiktsmeldstrale |
FI69664C (fi) * | 1980-04-11 | 1986-03-10 | Valmet Oy | Inloppslaoda foer en pappersmaskin |
AT377026B (de) * | 1980-12-19 | 1985-01-25 | Escher Wyss Gmbh | Stoffauflauf fuer eine papiermaschine |
AT378793B (de) * | 1981-05-14 | 1985-09-25 | Escher Wyss Gmbh | Stoffauflaufvorrichtung fuer papiermaschinen |
CA1230251A (en) * | 1983-11-25 | 1987-12-15 | Jose J. A. Rodal | Converflo trailing element |
US4566945A (en) * | 1984-04-11 | 1986-01-28 | Beloit Corporation | Headbox trailing element |
DE3502885A1 (de) * | 1985-01-29 | 1986-07-31 | Mitsubishi Jukogyo K.K., Tokio/Tokyo | Papiermaschinen-stoffauflauf |
US4604164A (en) * | 1985-01-30 | 1986-08-05 | Mitsubishi Jukogyo Kabushiki Kaisha | Flow restraining elements in the headbox of a paper machine |
CH672515A5 (de) * | 1987-02-02 | 1989-11-30 | Escher Wyss Gmbh | |
FR2631353A1 (fr) * | 1988-05-13 | 1989-11-17 | Semti | Dispositif d'alimentation en melange pateux |
US4941950A (en) * | 1989-07-26 | 1990-07-17 | Beloit Corporation | Headbox with grooved trailing element |
US5013406A (en) * | 1989-11-09 | 1991-05-07 | Beloit Corporation | Trailing element device for a headbox |
DE4019593C2 (de) * | 1990-06-20 | 1994-01-20 | Voith Gmbh J M | Stoffauflauf für Papiermaschinen |
DE4225297C2 (de) * | 1992-07-31 | 1996-11-28 | Voith Sulzer Papiermasch Gmbh | Stoffauflauf für eine Papiermaschine |
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 |
DE4440079C2 (de) * | 1994-11-10 | 1997-10-02 | Voith Sulzer Papiermasch Gmbh | Mehrschichten-Stoffauflauf |
-
1995
- 1995-04-27 EP EP95106390A patent/EP0681057B1/de not_active Expired - Lifetime
- 1995-04-27 AT AT95106390T patent/ATE222971T1/de not_active IP Right Cessation
- 1995-04-27 DE DE59510338T patent/DE59510338D1/de not_active Expired - Fee Related
-
1997
- 1997-02-27 US US08/801,132 patent/US5849159A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0681057A2 (de) | 1995-11-08 |
ATE222971T1 (de) | 2002-09-15 |
US5849159A (en) | 1998-12-15 |
DE59510338D1 (de) | 2002-10-02 |
EP0681057A3 (de) | 1997-04-16 |
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