EP0831172B1 - Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie - Google Patents
Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie Download PDFInfo
- Publication number
- EP0831172B1 EP0831172B1 EP97115325A EP97115325A EP0831172B1 EP 0831172 B1 EP0831172 B1 EP 0831172B1 EP 97115325 A EP97115325 A EP 97115325A EP 97115325 A EP97115325 A EP 97115325A EP 0831172 B1 EP0831172 B1 EP 0831172B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- suction
- web
- wet end
- zones
- papermaking machine
- 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
- D21F1/48—Suction apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/10—Suction rolls, e.g. couch rolls
-
- 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
Definitions
- the invention relates to a method for dewatering a Fiber web in a wire section of a paper machine, at which a fiber suspension from a headbox on Sieve is spread and dewatered.
- the invention further relates to a wire section of a paper machine.
- the width of the Outlet gap, through which the material jet exits, via the Specifically influenced web width in order to be as uniform as possible Adjust the fabric density cross profile (aperture control). however is the setting of a uniform formation cross profile problematic.
- EP-A-0 629 740 and DE-A-43 30 546 disclose Twin-wire former with formation strips that overlap extend the web width and one on the sieves Apply varying contact pressure across the web width.
- the invention has for its object a screen section and a method for dewatering a fibrous web in a To specify the wire section of a paper machine, with which one if possible uniform formation cross profile can be achieved.
- the object of the invention is in a method according to the achieved at the outset in that the drainage rate seen across the web running direction Reaching the immobility point in the lateral edge areas in the Relationship to the center of the fibrous web by means of a suction device, which extends across the web width the paper machine extends and the one across the web width Has varied suction, in particular a forming roller, is changed such that the formation cross-section is as uniform as possible.
- the drainage rate seen transversely to the web running direction in the edge areas in Ratio to the center of the fibrous web changed preferably is slowed down before the immobility point is reached becomes a uniformity of the cross-sectional density reached even before the formation cross profile was finally determined is.
- the Object of the invention by a arranged in front of the immobility point Suction device that extends across the web width of the paper machine extends and a suction effect varied over the web width in order to achieve a formation cross-section that is as uniform as possible has, solved.
- the drainage device can be a stationary one or rotating element, such as a suction roll.
- the drainage element is an advantageous further development formed as a suction roll, in particular as a forming roll, the divided into at least two lateral and a central zone which can be acted upon with different negative pressures.
- the zones can be separated from one another by partitions be displaceable in the axial direction.
- the drainage rate can be adjusted the edge areas in relation to the drainage speed be changed in the middle.
- the marginal areas lower suction angle than intended in the middle area, a faster drainage in the middle area to enable.
- the vacuum is adjustable at least in the peripheral areas.
- Fig. 1 is a screen section with the number 10 designated.
- the wire section 10 comprises a so-called duoformer CFD, such as this in the "Wochenblatt für Textilfabrikation” 119, 1992, no. 11/12, page 455-460 is described in detail.
- the pulp suspension is between a headbox 12 between a forming roll 20 arranged below and one laterally screen guide roller 20 or breast roller arranged obliquely above it diagonally upwards between an upper sieve 16 and a lower sieve 14 shot.
- the stream of fabric passes diagonally upwards the upper sieve 16 and is discharged via a jet channel (not shown). After the jet channel, the rest water passing through the upper sieve 16 together with the leading edge drainage removed on a vacuum skimmer (likewise not shown) .
- D-part 24 in which the fibrous web through pulsating forming elements in shape of forming strips 27, 28, which are on both sides of the screens 14, 16 are arranged, is dewatered.
- immobility point i.e. the point at which a final fixation the fibers between the sieves 14, 16.
- a suction area connects to the D-part, which is separated by a Wet vacuum cleaner 30 and a combination suction box 32, which is a vacuum cleaner for separating the upper sieve 16 and two flat suction zones, before the lower wire 14 is designed as a suction roll Screen guide roller 34 is guided.
- the ISO fabric density lines 36 would be transverse to 11 running lines before the immobility point is achieved.
- the fibrous web 18 at its edge areas becomes a significant homogenization of the formation profile achieved compared to the prior art.
- a particularly preferred way to control the drainage rate the fibrous web 18 at its edge areas to slow down is to use a forming roller 20, according to FIG. 3, at least in two lateral zones 76, 80 and a central zone 78 divided with different ones Suppress can be applied.
- the particular advantage of using such a forming roller 20 is that by this special design the forming roller only the dewatering speed the fibrous web 18 is affected in this area, while the drainage rate after leaving the D-part 24 can be largely constant seen over the web width.
- the forming roller 20 comprises a perforated roller jacket 39 with two roller covers 40, 42, which with tubular extensions and by means of a roller bearing 48, 50 in stationary bearing housings 44, 46 are supported.
- the latter also wear a stationary suction box, designated 38 in total is.
- the suction box 38 is composed of e.g. tubular seal support body 41, end plates 58, 60, and Support tubes 52, 54, which rest in the bearing housings 54, 56 and which serve as suction lines on both roller ends.
- the length of the suction box 38 is in the three suction zones 76, 78, 80 divided, the two lateral zones 76, 80 from the central zone 78 through two partitions 62, 64 are divided.
- the two edge zones 76, 80 are marked by a Connecting tube 56 connected to each other, so that both of the right side over the support tube 54 with the same negative pressure can be acted upon via a suction line 72 connected fan 74 is generated.
- the middle zone 78 through the left support tube 52 via a suction line 68 applied with a different vacuum, which over a connected blower 70 is generated.
- suction zones 76, 78, 80 are through in relation to the perforated jacket Sealing strips 66 sealed, both in the axial direction as well as in the circumferential direction, as can be seen from FIG. 4.
- the two partitions 62, 64 are in the direction of arrows 82, 84 adjustable towards the center, so the size of the edge zones 76, 80 in relation to the central zone 78.
- the suction angle ⁇ i.e. the center angle, over which the suction zones extend, in the Edge zones 76, 80 are smaller than in the central zone 78 be to a lower drainage performance in the peripheral areas than allow in the middle.
- the forming roller 20 also in a larger Number of suction zones can be divided to better Fine adjustment of the drainage speed in the axial direction to enable.
- one or more of the blowers 70, 74 be designed to be adjustable to the respective suction zones applied vacuum to the respective requirements optimal to be able to vote.
Description
- Fig. 1
- eine erfindungsgemäße Siebpartie in schematischer Darstellung;
- Fig. 2
- ein Aufsicht auf die Faserstoffbahn im Formerbereich, wobei Linien gleicher Stoffdichte eingezeichnet sind;
- Fig. 3
- einen Längsschnitt durch eine erfindungsgemäße Saugwalze und
- Fig. 4
- einen schematischen Querschnitt durch die Saugwalze gemäß Fig. 3 in vereinfachter, verkleinerter Darstellung zur Erläuterung des Besaugungswinkels.
Claims (9)
- Verfahren zum Entwässern einer Faserstoffsuspension in einer Siebpartie (10) einer Papiermaschine, bei dem die Faserstoffsuspension aus einem Stoffauflauf (12) auf ein Sieb (14) ausgebracht und entwässert wird, dadurch gekennzeichnet, daß noch vor Erreichen des Immobilitätspunktes die Entwässerungsgeschwindigkeit quer zur Bahnlaufrichtung (11) gesehen in den seitlichen Randbereichen im Verhältnis zur Mitte der Faserstoffbahn (18) mittels einer Saugeinrichtung, die sich über die Bahnbreite der Papiermaschine erstreckt und die eine über die Bahnbreite variierte Saugwirkung aufweist, insbesondere eine Formierwalze (20), derart verändert wird, daß ein möglichst gleichmäßiges Formationsquerprofil erreicht wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Faserstoffbahn (18) in den seitlichen Randbereichen weniger stark besaugt wird als in der Mitte.
- Siebpartie (10) einer Papiermaschine, gekennzeichnet durch eine vor dem Immobilitätspunkt angeordnete Saugeinrichtung, die sich über die Bahnbreite der Papiermaschine erstreckt und eine über die Bahnbreite variierte Saugwirkung zwecks Erreichung eines möglichst gleichmäßigen Formationsquerprofils aufweist.
- Siebpartie (10) einer Papiermaschine nach Anspruch 3, dadurch gekennzeichnet, daß die Saugeinrichtung als eine Saugwalze, insbesondere eine Formierwalze (20), ausgebildet ist und daß die Saugwalze zumindest in zwei seitliche Zonen (76, 80) und eine mittlere Zone (78) aufgeteilt ist, die mit unterschiedlichen Unterdrücken beaufschlagbar sind.
- Siebpartie (10) einer Papiermaschine nach Anspruch 4, dadurch gekennzeichnet, daß die Breite der Zonen (76, 78, 80) veränderbar ist.
- Siebpartie (10) einer Papiermaschine nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Zonen (76, 78, 80) durch Trennwände (62, 64) voneinander getrennt sind, die in Axialrichtung verschiebbar sind.
- Siebpartie (10) einer Papiermaschine nach einem oder mehreren der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß in den einzelnen Zonen verschiedene Besaugungswinkel (α) vorgesehen sind.
- Siebpartie (10) einer Papiermaschine nach einem oder mehreren der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß der Unterdruck zumindest in den seitlichen Randzonen (76, 80) einstellbar ist.
- Siebpartie (10) einer Papiermaschine nach einem oder mehreren der Ansprüche 4 bis 8, gekennzeichnet durch einen Mantel (39), dessen Strömungswiderstand über die Walzenbreite variiert ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19636792A DE19636792A1 (de) | 1996-09-11 | 1996-09-11 | Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie |
DE19636792 | 1996-09-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0831172A2 EP0831172A2 (de) | 1998-03-25 |
EP0831172A3 EP0831172A3 (de) | 1998-04-01 |
EP0831172B1 true EP0831172B1 (de) | 2003-08-06 |
Family
ID=7805181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97115325A Expired - Lifetime EP0831172B1 (de) | 1996-09-11 | 1997-09-04 | Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie |
Country Status (3)
Country | Link |
---|---|
US (1) | US6027612A (de) |
EP (1) | EP0831172B1 (de) |
DE (2) | DE19636792A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT405538B (de) * | 1997-11-28 | 1999-09-27 | Andritz Patentverwaltung | Vorrichtung zum entwässern einer faserstoffbahn |
US6190506B1 (en) * | 1998-10-29 | 2001-02-20 | Voith Sulzer Papiertechnik Patent Gmbh | Paper making apparatus having pressurized chamber |
DE10339262A1 (de) * | 2003-08-26 | 2005-03-17 | Voith Paper Patent Gmbh | Bahnführungseinrichtung |
DE10343914A1 (de) * | 2003-09-19 | 2005-05-04 | Voith Paper Patent Gmbh | Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren |
DE102008000236A1 (de) | 2008-02-05 | 2009-08-06 | Voith Patent Gmbh | Formiervorrichtung |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0332599A2 (de) * | 1988-03-09 | 1989-09-13 | Valmet Corporation | Verfahren und Vorrichtung in der Trockenpartie mit einzigem Trockentuch einer Papiermaschine und eine Walze zur Anwendung des Verfahrens |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US483340A (en) * | 1892-09-27 | Suction-roll for paper-machines | ||
DE233618C (de) * | ||||
US1805499A (en) * | 1930-02-14 | 1931-05-19 | Brown Co | Mask for cylinder molds |
US2369653A (en) * | 1942-06-08 | 1945-02-20 | Beloit Iron Works | Multicouch roll papermaking machine |
US2714342A (en) * | 1950-11-02 | 1955-08-02 | Beloit Iron Works | Suction roll |
US2929450A (en) * | 1957-07-18 | 1960-03-22 | Escher Wyss Gmbh | Suction roll for drying pulp webs, more especially in the paper and cellulose industry |
US3024839A (en) * | 1959-05-18 | 1962-03-13 | Beloit Iron Works | Suction regulating means |
US3322617A (en) * | 1964-05-22 | 1967-05-30 | Dexter Corp | Paper making apparatus to form paper with a simulated woven texture |
US3549742A (en) * | 1967-09-29 | 1970-12-22 | Scott Paper Co | Method of making a foraminous drainage member |
BE757981A (fr) * | 1969-11-14 | 1971-04-01 | Neyrpric Bmb | Dispositif de controle d'egouttage d'une suspension de particules pour la realisation d'un voile |
US3881987A (en) * | 1969-12-31 | 1975-05-06 | Scott Paper Co | Method for forming apertured fibrous webs |
US3775244A (en) * | 1971-10-14 | 1973-11-27 | Rhodiaceta | Apparatus for manufacturing nonwoven textiles |
CA1155370A (en) * | 1980-10-16 | 1983-10-18 | Huyck Corporation | Dryer fabric and method of making it |
DE3123131C2 (de) * | 1981-06-11 | 1986-01-09 | J.M. Voith Gmbh, 7920 Heidenheim | Entwässerungswalze mit Wasserabführungselement für ein Papiermaschinen-Siebband |
US4980979A (en) * | 1987-02-13 | 1991-01-01 | Beloit Corporation | Vacuum roll transfer apparatus |
FI97245C (fi) * | 1989-12-12 | 1996-11-11 | Valmet Paper Machinery Inc | Paperikoneen imutela |
DE9212448U1 (de) * | 1992-09-16 | 1992-11-05 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
FI103995B1 (fi) * | 1993-06-17 | 1999-10-29 | Valmet Paper Machinery Inc | Menetelmä ja laite sekä säätöjärjestely paperikoneessa paperirainan poikittaisen profiilin hallinnassa |
US5766419A (en) * | 1996-07-23 | 1998-06-16 | Valmet Corporation | Twin-wire gap former in a paper machine |
-
1996
- 1996-09-11 DE DE19636792A patent/DE19636792A1/de not_active Withdrawn
-
1997
- 1997-09-04 DE DE59710534T patent/DE59710534D1/de not_active Expired - Lifetime
- 1997-09-04 EP EP97115325A patent/EP0831172B1/de not_active Expired - Lifetime
- 1997-09-11 US US08/927,876 patent/US6027612A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0332599A2 (de) * | 1988-03-09 | 1989-09-13 | Valmet Corporation | Verfahren und Vorrichtung in der Trockenpartie mit einzigem Trockentuch einer Papiermaschine und eine Walze zur Anwendung des Verfahrens |
Also Published As
Publication number | Publication date |
---|---|
EP0831172A3 (de) | 1998-04-01 |
US6027612A (en) | 2000-02-22 |
EP0831172A2 (de) | 1998-03-25 |
DE59710534D1 (de) | 2003-09-11 |
DE19636792A1 (de) | 1998-03-12 |
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