EP0826818A2 - Verfahren und Vorrichtung zum Einstellen des Stoffdichte- und Faserorientierungsprofils in einem Stoffauflauf - Google Patents
Verfahren und Vorrichtung zum Einstellen des Stoffdichte- und Faserorientierungsprofils in einem Stoffauflauf Download PDFInfo
- Publication number
- EP0826818A2 EP0826818A2 EP97111794A EP97111794A EP0826818A2 EP 0826818 A2 EP0826818 A2 EP 0826818A2 EP 97111794 A EP97111794 A EP 97111794A EP 97111794 A EP97111794 A EP 97111794A EP 0826818 A2 EP0826818 A2 EP 0826818A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- turbulence
- suspension
- headbox
- angle
- 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.)
- Withdrawn
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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 headbox for a paper machine according to the Preamble of claim 1 and a method for adjusting the Material density and fiber orientation cross profile in a headbox according to the preamble of claim 10.
- Material density-controlled headboxes for adjusting the material density and Fiber orientation cross profiles are from a variety of applications known.
- the water or can also be a diluted stock suspension are parallel to these feed lines for a diluent, the water or can also be a diluted stock suspension.
- the dilution takes place in that the control current through the slow suspension stream flowing in the distribution pipe along the machine width Is deflected 180 ° and so with the input side into the distribution pipe fed in the suspension stream in the respective area of the Turbulence insert entering suspension stream forms with respect to Material density compared to that fed into the distribution pipe Corresponding suspension flow while keeping the volume flow constant was discontinued.
- a disadvantage of headboxes according to the first concept is that due to the only very small diameter of the dilution tubes Exit rate of the diluent or control flows into the Distribution pipe is very high. This requires a relatively large broad impact such control current, which has the consequence that the consistency in the individual sections of the headbox can only be set very roughly can. Furthermore, such thin tubes only allow the implementation of very small doses, so the range in which the consistency relative to the specified average consistency of the in the distribution pipe entering suspension flow can be set is very low.
- the suspension flow is fed again via a common distribution pipe, sectioned, that is in partial streams that are independent of one another across the width of the headbox, so-called section streams. This can be done, for example happen that the headbox across its width through partitions is divided into sections.
- the consistency is then adjusted by adding Control currents in the individual sections in a mixer.
- the one assigned to the individual sections closes Turbulence insert on.
- the consistency of the respective section streams is set, the Volume flow of the section flow is kept constant.
- DE 43 23 263 is for a sectioned headbox according to the DE 40 19 593 made known that the control current at angles between 5 ° and 90 ° in relation to the main flow direction in the individual sections can be injected.
- a disadvantage of the headboxes according to the second concept is that the Always set a material density and fiber orientation cross profile assumes that the supplied suspension stream is divided into partial streams is going to be in a subsequent mixer for the individual Sections to be adjusted accordingly.
- the object of the invention is therefore to offer a headbox in which the disadvantages of the arrangements according to the prior art avoided will.
- a headbox is to be created in which without a sectioning of the suspension stream introduced into the headbox is sufficient sharp regulation of the material density cross profile is made possible. Especially the width effect compared to that known from US 5196091 Device improved, that is, minimized.
- the invention is also intended to provide a method with which a Adjustment of the fabric density and basis weight cross profile is possible, whereby a division of the partial streams is avoided and still one sufficiently low broad impact is observed.
- this object is achieved by the headbox in claim 1 and the method according to claim 10 is achieved.
- the plurality of supply lines for the Control currents as in US 5196091 directly into the machine-wide distribution pipe flow out.
- the supply lines are immediately before the upstream end arranged of the turbulence insert, the suspension flow in this Only one flow component in the direction of the Has turbulence insert.
- As an angle, under which the supply line for the control current is introduced into the distribution pipe are angles between 5 ° and 170 ° with respect to the flow direction of the Suspension flow possible in turbulence, but is preferred under injected at a right angle.
- control currents directly before the suspension stream enters the Turbulence insert are preferably fed at a right angle. It is particularly preferred if the control current speed is selected in this way will be the most distant from the feed opening Turbulence tube of the turbulence insert a flow component in Direction of the injection and transverse to the direction of the suspension flow is present.
- Fig. 1 is a longitudinal section through a headbox according to the invention shown.
- the stock suspension is fed over a distribution pipe 1 along the machine width made available.
- the distributor pipe has one on the inflow side larger diameter 3 than 5 on the outlet side.
- the distribution pipe 1 is direct connected to the turbulence insert 7.
- the supply lines 13 for the control currents so-called Control power supply lines, provided.
- control valves 15 To the control current, which over the Lines 13 of the suspension stream flowing into the turbulence insert control valves 15 are in the supply line provided by an appropriate control or regulation, such as from DE 42 39 845, the disclosure content of which is fully in the application is involved, can be controlled known.
- Such Regulation is not shown in the present exemplary embodiment.
- Turbulence insert 7 comprises a plurality of in one embodiment Turbulence tubes 20, one over the height h of the turbulence insert
- a plurality of turbulence tubes 201, 202, 203, 204, 205 in a column 200 can be arranged.
- adjustable Apertures 32, 34 are provided, from which the material jet through a Outlet opening 36 flows out.
- Fig. 2 is an enlarged view again the input side Area of the headbox according to the invention shown in FIG. 1 with the there prevailing flow conditions shown in section.
- the Distribution tube 1 is the suspension from the paper plane of the drawing like represented by arrow 40 in the direction of the machine width.
- the distribution pipe itself finds a deflection according to the suspension flow Arrow 40 in the machine longitudinal direction, that is, on the input side End 11 of the turbulence insert 7, instead. It results in the connection area of the distribution pipe 9 a flow behavior as shown by arrow 42, i.e. in the direction of the turbulence insert.
- a control current 50 is fed into the connection area 9 via the feed line 13 the distribution pipe at an angle ⁇ , which in the present case is 90 °, fed.
- the control current 50 has a sufficiently high speed on, so that also at the feed opening 52 opposite end of the Distribution tube, that is, at a distance h from the feed opening, the Control current is a component perpendicular to the direction of the Has suspension flow 42. But serves to adjust the consistency only that existing at the inflow end 11 of the turbulence insert Component of the control current parallel to the direction of the Suspension flow 42. That means the control current must be used to adjust the Fabric density can be redirected.
- a deflection ⁇ 180 ° of the flow direction has a number of advantages over the injection according to US 5196091.
- the size of the feed opening can be chosen arbitrarily and is not limited by that of the surrounding turbulence tube as in the above-mentioned US patent.
- a larger feed opening allows the control streams to be injected at a lower speed and with a higher consistency, so that a greater range of variation ⁇ ⁇ 0 for the adjustability of the consistency increases by an average, supplied consistency value ⁇ 0 .
- This allows the stock density to be at least in one area across the width of the headbox ⁇ 0 - ⁇ 0 ⁇ ⁇ (d) ⁇ ⁇ 0 + ⁇ can be adjusted.
- Another advantage is that due to the low Injection speed and a deflection of the control current, the smaller than 180 °, the width effect of the injected control current is less than in the case of the above-mentioned US 5196091. This in turn has the advantage that the fabric density in the desired area is relatively sharply limited exactly can be set without overlapping the control effect comes in neighboring areas that are very difficult to influence can.
- FIG. 3 shows a top view of a headbox according to FIG. 1, however only part of the total machine width b is shown.
- the distribution pipe 1 which extends over the entire machine width b, tapering from the inflow to the outflow end formed, that is, the cross section 3 at The inlet end is larger than the cross section 5 at the outlet end 60.
- an outlet nozzle 62 through the outlet end through which the portion of the suspension stream supplied, which is not as indicated by arrow 40 in Direction of the turbulence insert is deflected, can be dissipated.
- the turbulence insert 7 comprises adjacent tube bundles, that is, arranged in a row or pipe gaps of turbulence pipes 20. In the present Embodiments are a total of five in the sectional view adjacent turbulence pipes 2000, 2001, 2002, 2003 and 2004 shown. At the turbulence insert 7 one closes on the Machine width adjustable aperture 32 on.
- Fig. 4 is the input end 11 of the turbulence insert, the a perforated plate 100 is closed off from the distribution pipe, shown.
- the perforated plate 100 has arranged in columns and rows Openings 110 for the adjoining turbulence tubes 20, in the present example, these in a column with six superposed turbulence pipes next to each other in series over the entire machine width b are arranged.
- are the feed openings 52 with the adjoining ones Supply lines 13 for the control currents at the upper end of not here shown distribution pipe, with which the plate 100 closes, attached.
- Each supply line 13 is assigned a control valve 15, which in turn is on a common control power supply line 112 through which the Diluent, for example the diluted suspension or also regulated only in the corresponding areas of the water Distribution tube can be supplied.
- 5 are the standard supply lines at an angle ⁇ ⁇ 90 ° to the Horizontal in a plane parallel to the plane of the entry surface of the Stock suspension arranged in the turbulence bundle.
- control currents 50 By injecting the control currents 50 at an angle ⁇ ⁇ 90 ° the control currents a component opposite to the direction of the Suspension stream 40 on. This can deflect the control currents reduced by the suspension flow or completely if ⁇ is correctly selected be avoided. Ideally, there is a broad effect 402 of the Control current, which is limited to a pipe gap.
- To prefer means on the feed lines 13 with which the inclination the same and thus ⁇ can be changed or adjusted.
- the deflection of the flow direction of the Control current is ⁇ 180 °.
Landscapes
- Paper (AREA)
Abstract
Description
- Fig. 1:
- eine Schnittansicht durch einen erfindungsgemäßen Stoffauflauf in Maschinenlängsrichtung;
- Fig. 2:
- eine vergrößerte Darstellung des Bereiches, in dem die Regelströme dem Suspensionsstrom zugemischt werden;
- Fig. 3:
- eine Draufsicht auf einen erfindungsgemäßen Stoffauflauf nach Fig. 1 in Maschinenlängsrichtung;
- Fig. 4 und Fig. 5:
- einen Ausschnitt einer Draufsicht auf den eingangsseitigen Teil des Turbulenzabschnittes mit den Zufuhrleitungen für die Regelströme im maschinenbreiten Verteilrohr;
- Fig. 6:
- dieselbe Ansicht wie Fig. 4 oder 5, gemäß dem Stand der Technik, wie aus der US 5196091 bekannt.
Claims (13)
- Stoffauflauf für eine Papiermaschine mit1.1 einem Turbulenzeinsatz (7);1.2 einem Verteilrohr (1), das sich ungeteilt über die gesamte Maschinenbreite (b) erstreckt zur Zufuhr eines Suspensionsstromes in den Turbulenzeinsatz (7);1.3 einer Düse mit einem Austrittsspalt (36);1.4 einer Vielzahl von Zufuhrleitungen (13) für einen Regelstrom; dadurch gekennzeichnet, daß1.5 die Vielzahl von Zufuhrleitungen (13) in dem Anschlußbereich (9) des Verteilrohres, in dem der Suspensionsstrom im wesentlichen eine Strömungskomponente in Richtung des Turbulenzeinsatzes (7) aufweist, an den Turbulenzeinsatz unmittelbar vor dessen einströmseitigem Ende (11) unter einem Winkel α zwischen 5° und 170° zur Richtung des Suspensionsstromes im Turbulenzeinsatz angeordnet sind, so daß1.6 mittels der über die Zufuhrleitungen (13) eingespeisten Regelströme die Stoffdichte des Suspensionsstromes in den Bereich der Einspeisestelle auf einen vorbestimmten Wert eingestellt werden kann, wobei der Volumenstrom des Suspensionsstromes in diesem Bereich konstant gehalten wird.
- Stoffauflauf gemäß Anspruch 1, dadurch gekennzeichnet, daß der Winkel α zwischen 85° und 95° liegt.
- Stoffauflauf gemäß Anspruch 2, dadurch gekennzeichnet, daß der Winkel α 90° beträgt.
- Stoffauflauf gemäß einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß die Vielzahl von Zufuhrleitungen (13) unter einem Winkel γ zwischen 5° und 90° zur Richtung des Suspensionsstromes im Verteilrohr (1) in einer Ebene parallel zur Ebene der Eintrittsfläche des Turbulenzeinsatzes angeordnet ist.
- Stoffauflauf gemäß Anspruch 4, daudrh gekennzeichnet, daß γ kleiner 90° ist.
- Stoffauflauf gemäß einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die Vielzahl von Zufuhrleitungen im Winkel γ einstellbar sind.
- Stoffauflauf gemäß einem der Ansprüche 1 - 6, dadurch gekennzeichnet, daß im Verteilrohr (1) Führungseinrichtungen (300) zu Umlenkung des Suspensionsstromes (40) in Richtung des Turbulenzeinsatzes vorgesehen sind.
- Stoffauflauf gemäß Anspruch 7, dadurch gekennzeichnet, daß die Führungseinrichtungen einstellbar sind.
- Stoffauflauf gemäß einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Turbulenzeinsatz (7) eine Vielzahl von Turbulenzrohren (20) umfaßt.
- Verfahren zum Einstellen des Stoffdichte- und/oder Faserorientierungsquerprofiles in einem Stoffauflauf umfassend folgende Verfahrensschritte:10.1 es wird dem Stoffauflauf über die gesamte Maschinenbreite ein Suspensionsstrom zugeführt;10.2 das Stoffdichtequerprofil des Suspensionsstromes wird mittels einer Vielzahl von über die Maschinenbreite (b) verteilten Regelströmen eingestellt, wobei der Volumenstrom des Suspensionsstromes konstant gehalten wird;
das Verfahren ist dadurch gekennzeichnet, daß10.3 die Regelströme in einem Bereich direkt vor dem Turbulenzeinsatz (7), in dem der Suspensionsstrom im wesentlichen nur noch eine Strömungskomponente in Richtung des Turbulenzeinsatzes aufweist in das Verteilrohr (1) unter einem Winkel α zur Richtung des Suspensionsstromes im Turbulenzeinsatz eingespeist wird, wobei α zwischen 5° und 170° liegt, so daß die Regelströme um weniger als 180° im Verteilrohr (1) umgelenkt werden und eine Strömungsrichtung parallel zum Suspensionsstrom aufweisen. - Verfahren gemäß Anspruch 10, dadurch gekennzeichnet, daß der Winkel α zwischen 85° und 95° liegt.
- Verfahren gemäß Anspruch 11, dadurch gekennzeichnet, daß die Regelströme senkrecht zur Richtung des Suspensionsstromes im Turbulenzeinsatz eingedüst werden.
- Verfahren gemäß einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, daß die Regelströme eine derartige Strömungsgeschwindigkeit relativ zur Suspensionsstromgeschwindigkeit aufweisen, daß der Regelstrom noch an den am weitesten von der Zufuhröffnung entfernten Turbulenzrohren einer Turbulenzrohrspalte des Turbulenzrohreinsatzes eine Strömungskomponente in Richtung der Eindüsung und quer zur Richtung der Suspensionsströmung aufweisen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19634993A DE19634993A1 (de) | 1996-08-30 | 1996-08-30 | Verfahren und Vorrichtung zum Einstellen des Stoffdichte- und Faserorientierungsprofils in einem Stoffauflauf |
DE19634993 | 1996-08-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0826818A2 true EP0826818A2 (de) | 1998-03-04 |
EP0826818A3 EP0826818A3 (de) | 1998-04-01 |
Family
ID=7804064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97111794A Withdrawn EP0826818A3 (de) | 1996-08-30 | 1997-07-11 | Verfahren und Vorrichtung zum Einstellen des Stoffdichte- und Faserorientierungsprofils in einem Stoffauflauf |
Country Status (4)
Country | Link |
---|---|
US (1) | US6136152A (de) |
EP (1) | EP0826818A3 (de) |
CN (1) | CN1175644A (de) |
DE (1) | DE19634993A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
FI105407B (fi) * | 1999-05-27 | 2000-08-15 | Valmet Corp | Paperikoneen tai kartonkikoneen perälaatikko |
EP1556544A2 (de) * | 2002-11-01 | 2005-07-27 | International Paper Company | Verfahren zur herstellung von mehrschichtigem papier |
EP1844192B1 (de) * | 2005-02-03 | 2011-04-06 | PMT Italia S.p.A. | Vorrichtung und verfahren zur regelung der konsistenz eines stoffsuspensionsstroms in einer papiermaschine |
CN102154914B (zh) * | 2011-02-24 | 2013-03-20 | 钟洲 | 制备芳纶纸的方法及由该方法获得的芳纶纸 |
EP3088604B1 (de) * | 2015-04-28 | 2020-03-25 | Valmet Technologies Oy | Verfahren und system zum optimieren der eigenschaften einer mehrschichtigen faserstoffbahn in der faserbahnherstellung |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3002558A (en) * | 1957-12-21 | 1961-10-03 | Voith Gmbh J M | Flow distributor for fiber material for use in connection with paper making machines |
US3328236A (en) * | 1964-06-22 | 1967-06-27 | Black Clawson Co | Bunched tube approach to a headbox of a papermaking machine |
DE4323263A1 (de) * | 1993-07-12 | 1994-01-13 | Voith Gmbh J M | Stoffauflauf einer Papiermaschine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4469556A (en) * | 1982-09-29 | 1984-09-04 | Beloit Corporation | Flow distributor |
DE3741603A1 (de) * | 1987-12-09 | 1989-06-22 | Voith Gmbh J M | Stoffauflauf fuer eine papiermaschine od.dgl. |
US5196091A (en) * | 1991-10-29 | 1993-03-23 | Beloit Technologies, Inc. | Headbox apparatus with stock dilution conduits for basis weight control |
DE4140657C2 (de) * | 1991-12-10 | 1994-07-14 | Voith Gmbh J M | Stoffauflauf |
DE4416909C2 (de) * | 1994-05-13 | 1997-12-11 | Voith Sulzer Papiermasch Gmbh | Stoffauflauf für eine Papiermaschine |
DE4437180C2 (de) * | 1994-10-18 | 1997-03-20 | Voith Sulzer Papiermasch Gmbh | Verfahren zur Herstellung eines Stoffauflaufes und Zwischenteil eines Stoffaufllaufes einer Papier- oder Kartonmaschine |
US5626722A (en) * | 1995-06-01 | 1997-05-06 | Valmet Corporation | Headbox of a paper/board machine |
-
1996
- 1996-08-30 DE DE19634993A patent/DE19634993A1/de not_active Withdrawn
-
1997
- 1997-07-11 EP EP97111794A patent/EP0826818A3/de not_active Withdrawn
- 1997-08-13 CN CN97117360A patent/CN1175644A/zh active Pending
- 1997-08-29 US US08/921,022 patent/US6136152A/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3002558A (en) * | 1957-12-21 | 1961-10-03 | Voith Gmbh J M | Flow distributor for fiber material for use in connection with paper making machines |
US3328236A (en) * | 1964-06-22 | 1967-06-27 | Black Clawson Co | Bunched tube approach to a headbox of a papermaking machine |
DE4323263A1 (de) * | 1993-07-12 | 1994-01-13 | Voith Gmbh J M | Stoffauflauf einer Papiermaschine |
Also Published As
Publication number | Publication date |
---|---|
DE19634993A1 (de) | 1998-03-05 |
EP0826818A3 (de) | 1998-04-01 |
CN1175644A (zh) | 1998-03-11 |
US6136152A (en) | 2000-10-24 |
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