EP0335821B1 - Vorrichtung zur Herstellung einer Bahn - Google Patents

Vorrichtung zur Herstellung einer Bahn Download PDF

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Publication number
EP0335821B1
EP0335821B1 EP19890630068 EP89630068A EP0335821B1 EP 0335821 B1 EP0335821 B1 EP 0335821B1 EP 19890630068 EP19890630068 EP 19890630068 EP 89630068 A EP89630068 A EP 89630068A EP 0335821 B1 EP0335821 B1 EP 0335821B1
Authority
EP
European Patent Office
Prior art keywords
stock
wire
headbox
disposed
turning bar
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
Application number
EP19890630068
Other languages
English (en)
French (fr)
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EP0335821A3 (en
EP0335821A2 (de
Inventor
Merle Wayne North
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.)
Beloit Corp
Original Assignee
Beloit Corp
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Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Publication of EP0335821A2 publication Critical patent/EP0335821A2/de
Publication of EP0335821A3 publication Critical patent/EP0335821A3/en
Application granted granted Critical
Publication of EP0335821B1 publication Critical patent/EP0335821B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 present invention relates to an apparatus and method for forming a web from paper stock ejected from a headbox. More particularly, this invention relates to a twin-wire forming section in which the headbox is disposed in close proximity to a first end of the forming section.
  • a typical paper web forming section includes a headbox for ejecting paper stock onto a moving flat screen known as a fourdrinier wire.
  • the stock from the headbox impinges against the moving fourdrinier wire and water within the stock is drained downwardly through the wire so that a fibrous web is formed on the upper surface of the fourdrinier wire.
  • the resultant web has an upper surface which displays different surface characteristics from the lower surface of the web.
  • Such two-sidedness, or lack of uniformity between the upper and lower surfaces of the web has caused problems in the finished product when used for printing in which uniformity of the surfaces is desirable.
  • twin-wire machine which enables the web to be dewatered upwardly as well as downwardly is known from DE 35 01 312 A1.
  • This so-called twin-wire machine includes an upper wire loop which cooperates with the lower fourdrinier wire such that the stock entering a forming section is dewatered through the upper and lower wires for removing a further portion of water from the web upwardly through the second wire.
  • FIG 8C of DE 35 01 312 A1 a first 63 and a second turning bar 62 are shown. These turning bars are disposed facing each other between the forming section and the first and second breast roll respectively.
  • the rotating breast rolls are of a diameter such that it is not possible to position the slice lip of the headbox very close to the first end of the forming section. Therefore, the slice lip of the headbox is disposed at a considerable distance from the forming section. It is evident that the wires 20 and 10 are very close to each other at the downstream edge of the turning bars 63 and 61 and the slice lip is not positioned in the gap between the turning bars, but it is positioned outside this gap between the breast rolls.
  • This distance between the slice lip and the gap causes the stock ejected from the headbox to contact the wires in the region of the turning bars and the jetted stock is splashing against the wires upstream relative to the turning bars. This splashing causes disturbance of the stock between the headbox and the first end of the forming section.
  • US-3 440 136 discloses also an apparatus for forming a web from paper stock ejected from a headbox.
  • Figure 2 two turning bars disposed close to the first end of a forming section are shown However, the stock from the headbox contacts both forming wires simultaneously at a point on the turning bars
  • the present invention reduces the distance between the headbox and the first end of the forming section by using stationary turning bars in place of the aforementioned rotatable breast rolls.
  • the present invention when combined with the extended trailing elements as taught by U.S. patent number 4,141,788 assigned to Beloit Corporation, provides a layered sheet having enhanced layer purity.
  • FIG. 1 is a side-elevational view of a horizontal BEL BAIE forming apparatus generally designated 10 according to the present invention.
  • the apparatus 10 forms a web W from paper stock ejected from a headbox 12.
  • the apparatus 10 includes a first and a second forming wire 14 and 16 respectively which cooperate together to define therebetween a forming section 18 having a first and a second end 20 and 22 respectively.
  • the first end 20 of the forming section 18 is disposed adjacent to the headbox 12 such that the stock ejected from the headbox 12 enters the first end 20 of the forming section 18 so that the stock is dewatered during passage from the first towards the second end 20 to 22 respectively of the forming section 18.
  • a first turning bar generally designated 24 is disposed adjacent to the first end 20 of the forming section 18 for guiding the first forming wire 14 such that the first wire 14 is disposed between the first turning bar 24 and the stock.
  • a second turning bar generally designated 26 is disposed adjacent to the first end 20 of the forming section 18 for guiding the second forming wire 16 such that the second wire 16 is disposed between the second turning bar 26 and the stock.
  • Figure 2 is an enlarged detailed view of the first end 20 of the forming section 18 showing the first and second turning bars 24 and 26 respectively.
  • the first and second turning bars 24 and 26 define respectively a first and second convex surface 28 and 30 for slidingly engaging the first and second wires 14 and 16 respectively such that the headbox 12 is disposed in close proximity to the first end 20 of the forming section 18 so that disturbance of the stock between the headbox 12 and the first end 20 of the forming section 18 is minimized.
  • the stock 32 ejected from the headbox 12 enters the forming section 18 centrally such that the stock 32 first contacts the first and second wires 14 and 16 respectively at approximately the same distance D from the headbox 12.
  • the angular disposition of the headbox 12 relative to the first end 20 of the forming section 18 is adjustable so that a first distance D1 between the headbox 12 and the point P1 at which the stock 32 first contacts the first wire 14 is adjustable relative to a second distance D2 between the headbox 12 and a second point P2 at which the stock 32 first contacts the second wire 16.
  • the first turning bar 24 is disposed downstream relative to the second turning bar 26 and the first convex surface 28 defines a leading and a trailing edge 34 and 36 respectively.
  • the trailing edge 36 of the first convex surface 28 is disposed almost parallel to the stock 32.
  • the second convex surface 30 defines a forward and a rearward portion 38 and 40 respectively with the rearward portion 40 being disposed almost parallel to the stock 32.
  • the convex surfaces 28 and 30 are ceramic for reducing wear between the respective wires 14 and 16 and the turning bars 24 and 26.
  • the convex surfaces 28 and 30 are fabricated from zirconia and in another embodiment of the present invention, these surfaces are of aluminum oxide.
  • Figure 2 further shows a solid shoe 42 which is disposed downstream relative to the first turning bar 24 such that the first wire 14 is disposed between the shoe 42 and the stock 32. More particularly, the solid shoe 42 defines an upstream and a downstream end 44 and 46 respectively such that the stock 32 first contacts the first wire 14 between the upstream and downstream ends 44 and 46 of the shoe 42 as shown in figure 2.
  • the angular disposition of the headbox can be adjusted such that the stock 32 first contacts the first wire 14 between the first turning bar 24 and the solid shoe 42 such that a first portion of water is removed from the stock 32 upstream relative to the solid shoe 42.
  • Figure 2 further shows a first shower 48 disposed upstream relative to the first turning bar 24 for spraying lubricating water between the first wire 14 and the first turning bar 24 for assisting movement of the first wire 14 relative to the first turning bar 24.
  • a second shower 50 is disposed upstream relative to the second turning bar 26 for spraying lubricating water between the second wire 16 and the second turning bar 26 for assisting movement of the second wire 16 relative to the second turning bar 26.
  • Figure 4 shows a second embodiment of the present invention in which the forming section 18A is disposed vertical with the headbox 12A being disposed beneath the forming section 18A.
  • This arrangement is known as the BEL BAIE III FORMER.
  • BEL BAIE III is a registered trademark of Beloit Corporation.
  • Figure 5 is a side-elevational view of a further embodiment of the present invention for the manufacture of a multi-ply board having enhanced outer layer purity which results in a web having improved printing characteristics.
  • a headbox generally designated 12B is of the type shown in U.S. patent number 4,141,788 assigned to Beloit Corporation.
  • the aforementioned headbox 12B is a CONVERFLO headbox.
  • CONVERFLO is a registered trademark of Beloit Corporation.
  • the headbox 12B includes trailing elements 52,53,54,55,56 and 57.
  • the elements 53 and 56 extend downstream relative to the slice lip 62.
  • the arrangement is such that during formation, the inner layer 64 of relatively low quality stock does not come into physical contact with the outer layers 66 and 68 which are of a relatively high quality stock until the outer layers 66 and 68 have been dewatered to a certain degree.
  • This has the advantage that migration or diffusion of the relatively low quality stock of the layer 64 into the adjacent layers 66 and 68 is minimized thereby maintaining a very good outer layer purity.
  • Such purity of the outer layers 66 and 68 improves the printability of the resultant board.
  • stock is ejected from a headbox such that the stock enters the forming section at the first end thereof.
  • the first and second wires are guided respectively by first and second turning bars which define convex surfaces such that the slice lip of the headbox may be moved into close proximity to the first end of the forming section thereby minimizing disturbance and breakup of the stock between the slice lip and the first end 20 of the forming section thereby increasing the uniformity of the resultant web and inhibiting streaking thereof and enabling the angle at which the stock impinges against the first wire to be minimized.
  • the present invention by substituting stationary turning bars for rotatable breast rolls, enables the headbox to be positioned very close to the forming section thereby enhancing the uniformity of the resultant web by inhibiting disturbance, breaking up and streaking of the stock.
  • the present invention is useful in the production of all grades of paper and board, the present invention is particularly useful and applicable to the production of fine paper grades and newsprint.

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  • Paper (AREA)

Claims (13)

  1. Vorrichtung zur Bildung einer Bahn (W) aus Papierpulpe, die aus einem Stoffauflaufkasten (12) ausgestoßen wird, wobei die Vorrichtung folgendes beinhaltet:
       ein erstes und ein zweites Formsieb (14, 16), die zusammenwirken, um zwischen sich eine Formationszone (18) mit einem ersten und einem zweiten Ende (20, 22) zu bilden,
       wobei das erste Ende (20) der Formationszone (18) an den Stoffauflaufkasten (12) angrenzend angeordnet ist, derart, daß die von dem Stoffauflaufkasten (12) ausgestoßene Pulpe (32) in das erste Ende (20) der Formationszone (18) eintritt und während des Durchlaufens der Formationszone (18) von dem ersten Ende (20) bis zu dem zweiten Ende (22) entwässert wird,
       eine erste Wendeleiste (24), die an dem ersten Ende (20) der Formationszone (18) angrenzend angeordnet ist und zum Führen des ersten Formsiebs (14) dient, derart, daß das erste Sieb (14) zwischen der ersten Wendeleiste (24) und der Pulpe (32) angeordnet ist,
       eine zweite Wendeleiste (26), die an dem ersten Ende (20) der Formationszone (18) angrenzend angeordnet ist und zum Führen des zweiten Formsiebs (16) dient, derart, daß das zweite Sieb (16) zwischen der zweiten Wendeleiste (26) und der Pulpe (32) angeordnet ist,
       wobei die erste bzw. die zweite Wendeleiste (24, 26) eine erste bzw. eine zweite konvexe Oberfläche (28, 30) bilden, an der das erste bzw. das zweite Sieb (14, 16) in gleitendem Eingriff anliegt,
       und wobei die erste und die zweite Wendeleiste (24, 26) jeweils Brustwalzen ersetzen, wodurch der Stoffauflaufkasten (12) in nächster Nähe der Formationszone (18) angeordnet werden kann, dadurch gekennzeichnet, daß
       eine stromabwärts bezüglich der ersten Wendeleiste (24) angeordnete massive Schuhleiste vorgesehen ist, derart, daß das erste Sieb (14) zwischen der Schuhleiste (42) und der Pulpe (32) angeordnet ist,
       daß die erste Wendeleiste (24) stromabwärts bezüglich der zweiten Wendeleiste (26) angeordnet ist, derart, daß die Pulpe (32) das erste Sieb (14) zuerst zwischen der ersten Wendeleiste (24) und der Schuhleiste (42) berührt,
       und daß das erste und das zweite Sieb (14, 16) so geführt werden, daß der Winkel, unter dem die Pulpe (32) das erste Sieb (14) berührt, minimiert ist.
  2. Vorrichtung nach Anspruch 1, bei der die Formationszone (18) vertikal angeordnet ist, wobei der Stoffauflaufkasten (12) unterhalb der Formationszone (18) angeordnet ist.
  3. Vorrichtung nach Anspruch 1, bei der die Formationszone (18) und der Stoffauflaufkasten (12) horizontal angeordnet sind.
  4. Vorrichtung nach Anspruch 1, bei der von dem Stoffauflaufkasten (12) ausgestoßene Pulpe (32) zentriert in die Formationszone (18) eintritt, derart, daß die Pulpe (32) das erste und das zweite Sieb (14, 16) jeweils zuerst in etwa dem gleichen Abstand (D) von dem Stoffauflaufkasten (12) berührt.
  5. Vorrichtung nach Anspruch 1, bei der die relative Winkelstellung des Stoffauflaufkastens (12) zu dem ersten Ende (20) der Formationszone (18) einstellbar ist, derart, daß ein erster Abstand (D1) zwischen dem Stoffauflaufkasten (12) und der Stelle (P1), an der die Pulpe (32) das erste Sieb (14) zuerst berührt, bezüglich einem zweiten Abstand (D2) zwischen dem Stoffauflaufkasten (12) und einer zweiten Stelle (P2), an der die Pulpe (32) das zweite Sieb (16) zuerst berührt, einstellbar ist.
  6. Vorrichtung nach Anspruch 1, bei der die erste konvexe Oberfläche (28) eine Vorderkante (34) und eine Hinterkante (36) bildet, wobei die Hinterkante (36) der ersten konvexen Oberfläche (28) beinahe parallel zu der Pulpe (32) angeordnet ist.
  7. Vorrichtung nach Anspruch 1, bei der die zweite konvexe Oberfläche (30) einen vorderen Bereich (38) und einen hinteren Bereich (40) bildet, wobei der hintere Bereich (36) beinahe parallel zu der Pulpe (32) angeordnet ist.
  8. Vorrichtung nach Anspruch 1, bei der die erste und die zweite konvexe Oberfläche (28, 30) aus Keramik bestehen, um die Abnutzung zwischen den Sieben (14, 16) und den zugeordneten Wendeleisten (24, 26) zu vermindern.
  9. Vorrichtung nach Anspruch 8, bei der die erste und die zweite konvexe Oberfläche (28, 30) aus Zirkonium hergestellt sind.
  10. Vorrichtung nach Anspruch 8, bei der die erste und die zweite konvexe Oberfläche (28, 30) aus Aluminiumoxid bestehen.
  11. Vorrichtung nach Anspruch 1, die ferner folgendes beinhaltet:
       eine stromaufwärts bezüglich der ersten Wendeleiste (24) angeordnete erste Brause (48) zum Versprühen von Schmierwasser zwischen dem ersten Sieb (14) und der ersten Wendeleiste (24), um so die Bewegung des ersten Siebs (14) bezüglich der ersten Wendeleiste (24) zu unterstützen, und
       eine stromaufwärts bezüglich der zweiten Wendeleiste (26) angeordnete zweite Brause (50) zum Versprühen von Schmierwasser zwischen dem zweiten Sieb (16) und der zweiten Wendeleiste (26), um so die Bewegung des zweiten Siebs (16) bezüglich der zweiten Wendeleiste (26) zu unterstützen.
  12. Vorrichtung nach Anspruch 1, mit einem Stoffauflaufkasten, der folgendes beinhaltet:
       eine Trennlippe (62) und
       ein erstes und ein zweites Austrittsterteil (53, 56), die sich von innerhalb des Stoffauflaufkastens (12B) stromabwärts bis zur Trennlippe (62) erstrecken, derart, daß, während der Herstellung von mehrlagiger Pappe, eine Lage Pulpe (74) relativ niedriger Qualität zwischen dem ersten und dem zweiten Austrittsteil (53, 56) fließt und von den äußeren Lagen (66, 68) der Pulpe bis zu dem Zeitpunkt getrennt wird, an dem die äußeren Lagen (66, 68) einer teilweise Entwässerung unterzogen worden sind, wodurch einer Diffusion und Migration der inneren Lage (64) in die äußeren Lagen (66, 68) relativ hoher Qualität verhindert wird und die Bedruckbarkeit der so erhaltenen Pappe verbessert wird.
  13. Verfahren zur Bildung einer Bahn aus Papierpulpe (32), die aus einem Stoffauflaufkasten (12) ausgestoßen wird, das folgende Verfahrensschritte aufweist:
       Ausstoßen der Pulpe aus dem Stoffauflaufkasten (12) und Einbringen zwischen einem ersten und einem zweiten Formsieb (14, 16), die zusammenwirken, um zwischen sich eine Formationszone (18) mit einem ersten und einem zweiten Ende (20, 22) zu bilden,
       Führen des ersten Siebs (14) um eine erste Wendeleiste (24), derart, daß der Stoffauflaufkasten (12) in nächster Nähe zum ersten Ende (20) der Formationszone (18) angeordnet ist, und
       Führen des zweiten Siebs (16) um eine zweite Wendeleiste (26), die stromaufwärts bezüglich der ersten Wendeleiste (24) angeordnet ist, wobei die erste bzw. die zweite Wendeleiste (24, 26) eine erste bzw. eine zweite konvexe Oberfläche (28, 30) bilden, an der das erste bzw. das zweite Sieb (14, 16) in gleitenden Eingriff anliegt,
    qekennzeichnet durch folgende weitere Verfahrensschritte:
       Führen des ersten Siebs (24) um eine stromabwärts bezüglich der ersten Wendeleiste (24) gelegene Schuhleiste, derart, daß das erste Sieb (14) zwischen der Schuhleiste (42) und der Pulpe (32) angeordnet ist,
       Hinleiten des Pulpenstrahls derart, daß dieser das erste Sieb (14) zuerst zwischen der ersten Wendeleiste (24) und der Schuhleiste (42) berührt,
       Entfernen eines ersten Wasseranteils aus der Pulpe an einer stromaufwärts der Schuhleiste (42) gelegenen Stelle und
       Führen der Siebe (14, 16) derart, daß der Winkel, unter dem die Pulpe (32) das erste Sieb (14) berührt, minimiert ist.
EP19890630068 1988-03-30 1989-03-30 Vorrichtung zur Herstellung einer Bahn Expired - Lifetime EP0335821B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17501288A 1988-03-30 1988-03-30
US175012 1988-03-30

Publications (3)

Publication Number Publication Date
EP0335821A2 EP0335821A2 (de) 1989-10-04
EP0335821A3 EP0335821A3 (en) 1990-01-31
EP0335821B1 true EP0335821B1 (de) 1993-10-06

Family

ID=22638468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890630068 Expired - Lifetime EP0335821B1 (de) 1988-03-30 1989-03-30 Vorrichtung zur Herstellung einer Bahn

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EP (1) EP0335821B1 (de)
JP (1) JPH01314797A (de)
CA (1) CA1313964C (de)
DE (1) DE68909651T2 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9001078D0 (en) * 1990-01-17 1990-03-14 Kodak Ltd Photographic silver chloride emulsions
DE4105215C2 (de) * 1991-02-20 1996-10-17 Voith Gmbh J M Sieb-Formerpartie
DE4117597A1 (de) * 1991-05-29 1992-12-03 Voith Gmbh J M Doppelsiebformer fuer eine papiermaschine
US5160583A (en) * 1991-12-02 1992-11-03 Beloit Corporation Controlled jet injection apparatus for a papermaking machine headbox
DE4332162C2 (de) * 1993-09-22 1994-12-01 Voith Gmbh J M Doppelsiebformer einer Papiermaschine
US6372091B2 (en) 1999-06-18 2002-04-16 Metso Paper, Inc. Method and apparatus for forming a paper web
DE10012342A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Doppelsiebformer
FI122893B (fi) 2010-12-20 2012-08-31 Metso Paper Inc Kuiturainakoneen muodostusosan kitajärjestely

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440136A (en) * 1965-12-16 1969-04-22 Kimberly Clark Co Papermaking apparatus including two wire sheet formers having means for air purging
US3743571A (en) * 1969-02-03 1973-07-03 Int Paper Co Paper web formation using dual fabrics
AT322963B (de) * 1970-10-30 1975-06-25 Arledter Hanns F Dr Ing Verfahren zur blattbildung bei einer doppelsieb-papiermaschinen
US3823062A (en) * 1972-02-28 1974-07-09 Int Paper Co Twin-wire papermaking employing stabilized stock flow and water filled seal(drainage)boxes
FI63077C (fi) * 1977-09-21 1983-04-11 Tampella Oy Ab Foerfarande och anordning foer reglering av profilen av en fiberbana i en pappersmaskin
FI840246A (fi) * 1984-01-20 1985-07-21 Valmet Oy Foerfarande och anordning vid formning av pappersbana.

Also Published As

Publication number Publication date
EP0335821A3 (en) 1990-01-31
DE68909651D1 (de) 1993-11-11
JPH0413479B2 (de) 1992-03-09
DE68909651T2 (de) 1994-02-10
EP0335821A2 (de) 1989-10-04
JPH01314797A (ja) 1989-12-19
CA1313964C (en) 1993-03-02

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