EP1813721B1 - Verfahren und Vorrichtung zur Bildung einer Papier- oder Kartonbahn - Google Patents

Verfahren und Vorrichtung zur Bildung einer Papier- oder Kartonbahn Download PDF

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Publication number
EP1813721B1
EP1813721B1 EP06126500A EP06126500A EP1813721B1 EP 1813721 B1 EP1813721 B1 EP 1813721B1 EP 06126500 A EP06126500 A EP 06126500A EP 06126500 A EP06126500 A EP 06126500A EP 1813721 B1 EP1813721 B1 EP 1813721B1
Authority
EP
European Patent Office
Prior art keywords
dewatering
forming
zone
elements
wires
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.)
Not-in-force
Application number
EP06126500A
Other languages
English (en)
French (fr)
Other versions
EP1813721A1 (de
Inventor
Erkki Ilmoniemi
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1813721A1 publication Critical patent/EP1813721A1/de
Application granted granted Critical
Publication of EP1813721B1 publication Critical patent/EP1813721B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • D21F1/028—Details of the nozzle section

Definitions

  • the present invention concerns a method for the forming of a paper or board web as defined in the preamble of claim 1.
  • the invention also concerns an equipment for the forming of a paper or board web as defined in the preamble of claim 6. Such a method and such an equipment is shown in DE 297 02 548 U1 .
  • the roll and blade former is the roll and blade former.
  • the pulp suspension is fed from the slice opening of a headbox as an open jet into a curved forming gap bordered by two wires.
  • the forming gap there are a number of dewatering blades which are arranged on the side of either wire loop.
  • the curved forming gap is achieved by means of a forming roll over which the wires are arranged to run.
  • the inner wire is supported against the surface of the forming roll while the outer wire is unsupported so that the outer wire receives some of the pressure of the slice jet.
  • the tension of the outer wire contributes to dewatering from the pulp suspension fed between the wires.
  • a vacuum pulse is created on its outgoing side.
  • This vacuum pulse may damage the structure of the partly dewatered web located between the wires. In this case, the damaged web can no longer endure the strong pulsation in the pulsating dewatering zone following the forming roll.
  • Another problem of roll and blade formers is insufficient dewatering capacity at great speeds.
  • the forming roll is also expensive. Having a large size, the forming roll requires much space, and a backup roll is always required by it.
  • gap formers equipped with a fixed gap, into which the pulp suspension is fed as a closed jet without free bordering surfaces and where the web is formed between two wires which advance under mechanical control.
  • FI patent 85885 presents such web-forming equipment, where a forming gap which narrows in the machine direction is restricted by a dewatering box on both sides. The pressure created in the gap presses water from the pulp suspension located between the wires through the holes in the cover of the dewatering boxes. The goal is to carry out the dewatering as slowly as possible in a long and narrow gap. After the mechanically-controlled forming gap, the web is led to the forming roll via a wet suction box. The formation of flocks must be prevented as early as at the area influenced by the dewatering boxes, because this is no longer possible in subsequent dewatering stages as the fibers already form a uniform fiber network.
  • the objective of the present invention is to solve the problems related to prior art technology.
  • the headbox and the forming zone are integrated to each other in a known manner so that the pulp suspension is transferred from the headbox to the forming zone as a closed jet without free boundary surfaces.
  • the transfer of the pulp suspension in an enclosed space improves the evenness of the web, since the wind effect of surrounding air exerted on a free jet, with this wind effect causing small waves on the surface of the free jet, is eliminated.
  • Initial dewatering takes place by means of dewatering elements which support the wires and which guide the wires mechanically closer to each other. After the short initial dewatering zone, dewatering continues on the curved surface of the forming shoe, where the tension of the outer wire and the pressure pulsation created by the dewatering blades promote dewatering and improve web formation.
  • the maximum length of the initial dewatering zone bordered by the dewatering elements is 50 %, preferably at the most 30 %, of the length of the forming shoe following it.
  • Initial dewatering is preferably carried out using non-pulsating dewatering elements, in which case water is removed from the pulp suspension gently, only by the effect of pressure difference. After initial dewatering, the dry matter content of the pulp suspension is still relatively low, preferably less than 3 %. This gives an opportunity to influence web formation in the subsequent dewatering stages. After the initial dewatering zone, dewatering is intensified and web formation is improved by means of the blades and curvature of the forming shoe.
  • the present invention helps to avoid problems caused by high wire tensions.
  • Wire rolls are not required to be as rigid as in roll and blade formers. An expensive forming roll is not needed.
  • Initial dewatering can be adjusted easily by adjusting the internal pressure of the dewatering box. This adjustment also changes the propagation velocity of the pulp suspension in relation to the wires and hence influences fiber orientation in the paper web formed.
  • the forming section shown in the figure comprises the first wire loop 11 and the second wire loop 12, which border the two-wire forming zone between them.
  • first wire loop 11 Inside the first wire loop 11 are the first breast roll 13, the first guide strip 14 and the first dewatering element 23, which guide the travel of the first wire 11 in the entry area of the forming zone.
  • second wire loop 12 Inside the second wire loop 12 are the second breast roll 15, the second guide strip 16 and the second dewatering element 24, which guide the travel of the second wire 12 in the entry area of the forming zone.
  • the headbox 17 is located between the breast rolls 13, 15 so that its slice channel 18, which narrows in the flow direction, extends deep between the wires 11, 12.
  • Plate-like support elements 21, 22 have been attached after the walls 19, 20 which border the slice channel 18. The support elements 21, 22 extend into contact with the wires 11, 12.
  • the flexible support elements 21, 22 are installed so that their outer surfaces are in close contact against the wires 11, 12 which move along the guide strips 14, 16, so that the pulp suspension is transferred from the headbox 17 to the forming zone without free boundary surfaces.
  • the pulp suspension is accelerated in the headbox 17 essentially to the same velocity with the wires 11, 12.
  • the pulp suspension is discharged from the slice channel 18 to between the wires 11, 12 at a point where both wires 11, 12 are supported by the dewatering element 23 and 24. Between them, the dewatering elements 23 and 24 provide the borders for a gap which narrows in the flow direction, with the gap being a direct continuation to the slice channel 18 which is bordered by the walls 19, 20 and support elements 21, 22.
  • the pressure created in the gap presses water from the pulp suspension located between the wires 11, 12 through the openings 26, 27 in the water removal elements 23, 24.
  • the openings 26, 27 are preferably arranged so that they accomplish non-pulsating dewatering. There are no pressure pulses for example when the openings 26, 27 are holes, or slots which run across the cover diagonally.
  • One of the dewatering elements 23, 24 comprises a dewatering box 25, within the region of which dewatering can be adjusted by changing the internal pressure (overpressure or vacuum) in the dewatering box by means of known methods used on paper machines.
  • both dewatering elements 23, 24 can be equipped with an adjustable dewatering box.
  • the stationary dewatering elements 23, 24 are followed by a forming shoe 29 equipped with a curved blade cover, with the forming shoe 29 placed inside the second wire loop 12.
  • the forming shoe 29 can be composed of one or more consecutive suction boxes depending on the application, and its total length L 1 is preferably 500-1500 mm.
  • the forming shoe 29 comprises a number of dewatering blades 28 which are in cross direction to the travel direction of the web.
  • the dewatering blades 28 create pulsating dewatering, which intensifies dewatering from the pulp suspension located between the wires 11, 12 and improves the formation of the web.
  • loading elements 30 can be used for improving the formation.
  • the loading elements 30 are located on the side of the opposite wire loop 11 so that they meet the openings remaining between the dewatering blades 28.
  • the dewatering elements 23, 24 provide the borders for the initial dewatering zone, which is relatively short.
  • Its length L 0 is at the most 50 %, preferably at the most 30 %, of the length L 1 of the forming shoe 29 following the initial dewatering zone.
  • the length L 0 of the initial dewatering zone is usually 50-500 mm, preferably 100-300 mm.
  • the length of the initial dewatering zone L 0 depends on the properties of the pulp suspension. When making paper or board from an easily dewatered pulp, the initial dewatering zone can be shorter than when making paper or board from a dense pulp which is more difficult to dewater.
  • the dewatering elements 23, 24 can have a straight or curved surface. By using known mechanisms, they can be adjusted to a suitable position in relation to the frame of the machine in order to adjust the width of the gap.

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  • Paper (AREA)
  • Making Paper Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (12)

  1. Verfahren zum Ausbilden einer Papier- oder Kartonbahn, wobei eine Pulpesuspension von einem Stoffauflaufkasten (17) als ein geschlossener Strom zu einer Anfangsentwässerungspartie übertragen wird, die sich zwischen zwei stationären Entwässerungselementen (23, 24) befindet und durch diese begrenzt ist, über welche Formiersiebe (11, 12) zum Laufen angeordnet sind, während zu derselben Zeit Wasser durch Öffnungen (26, 27) in den Abdeckungen der Entwässerungselemente (23, 24) aus der sich zwischen den Sieben (11, 12) befindenden Pulpesuspension entfernt wird, wobei die Siebe (11, 12) nach der Anfangsentwässerungspartie über die gekrümmte Abdeckung eines Formierschuhs (29) geführt werden, während zu derselben Zeit Druckimpulse auf die sich zwischen den Sieben (11, 12) befindende Pulpesuspension unter Verwendung von Entwässerungsleisten (28) ausgeübt werden, die sich an der Abdeckung des Formierschuhs (29) befinden,
    dadurch gekennzeichnet, dass
    die Länge (L0) der durch die Entwässerungselemente (23, 24) begrenzten Anfangsentwässerungspartie höchstens 50% der Länge (L1) des dieser folgenden Formierschuhs (29) ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Länge (L0) der Anfangsentwässerungspartie höchstens 30% der Länge (L1) des Formierschuhs (29) ist.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Öffnungen (26, 27) der Entwässerungselemente (23, 24) so angeordnet sind, dass sie ein nicht-pulsierendes Entwässern bewerkstelligen.
  4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens eines der Entwässerungselemente (23, 24) mit einem Entwässerungskasten (25) ausgerüstet ist, wobei dessen Entwässerung einstellbar ist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Druckimpulse auf die Pulpesuspension in der Partie des Formierschuhs (29) unter Verwendung von Leisten (30) ausgeübt werden, welche belastet werden können, wobei die Leisten (30) im Inneren der Siebschleife (11) angeordnet sind, die sich gegenüber von dem Formierschuh (29) befindet.
  6. Anlage für das Ausbilden einer Papier- oder Kartonbahn, wobei die Anlage einen Stoffauflaufkasten (17) und zwei Siebschleifen (11, 12) aufweist, die eine Formierpartie zwischen diesen eingrenzen, wobei der Stoffauflaufkasten (17) in Beziehung auf die Siebe (11, 12) so abgedichtet ist, dass die Pulpesuspension von dem Stoffauflaufkasten (17) zu der Formierpartie als ein geschlossener Strom ohne freie Grenzflächen geleitet wird, wobei die Formierpartie ein erstes stationäres Entwässerungselement (23), das sich im Inneren der ersten Siebschleife (11) befindet, und ein zweites stationäres Entwässerungselement (24) aufweist, das sich im Inneren der zweiten Siebschleife (12) befindet, so dass das erste und das zweite Entwässerungselement (23, 24) eine sich in der Strömungsrichtung verengende Anfangsentwässerungspartie zwischen diesen begrenzen, wobei die Entwässerungselemente (23, 24) mit Öffnungen (26, 27) zum Entfernen von Wasser aus der Pulpesuspension versehen sind, welche zwischen den Sieben (11, 12) gefördert wird, wobei die Anfangsentwässerungspartie, die durch die Entwässerungselemente (23, 24) begrenzt ist, von einem Formierschuh (29) gefolgt wird, der mit einer gekrümmten Abdeckung ausgerüstet ist, wobei der Formierschuh (29) im Inneren von einer der Siebschleifen (11, 12) angeordnet ist und mit Entwässerungsleisten (28) ausgerüstet ist,
    dadurch gekennzeichnet, dass
    die Länge (L0) der durch die Entwässerungselemente (23, 24) begrenzten Anfangsentwässerungspartie höchstens 50% der Länge (L1) des dieser folgenden Formierschuhs (29) ist.
  7. Anlage nach Anspruch 6, dadurch gekennzeichnet, dass die Länge (L0) der Anfangsentwässerungspartie höchstens 30% der Länge (L1) des Formierschuhs (29) ist.
  8. Anlage nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass wenigstens eines der Entwässerungselemente (23, 24) mit einem Entwässerungskasten (25) ausgerüstet ist, dessen Entwässerung einstellbar ist.
  9. Anlage nach einem der vorhergehenden Ansprüche 6 bis 8, dadurch gekennzeichnet, dass wenigstens eines von den Entwässerungselementen (23, 24) gekrümmt ist.
  10. Anlage nach einem der vorhergehenden Ansprüche 6 bis 8, dadurch gekennzeichnet, dass beide Entwässerungselemente (23, 24) eine gerade Oberfläche haben und einen Entwässerungskasten aufweisen, dessen Entwässerung einstellbar ist.
  11. Anlage nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, dass die Öffnungen (26, 27) der Entwässerungselemente (23, 24) so angeordnet sind, dass sie ein nicht pulsierendes Entwässern bewerkstelligen.
  12. Anlage nach einem der vorhergehenden Ansprüche 6 bis 11, dadurch gekennzeichnet, dass wenigstens eine Leiste (30), die belastet werden kann, im Inneren der Siebschleife (11) angeordnet ist, welche dem Formierschuh (29) gegenüberliegt, wobei die Leiste (30) so angepasst ist, dass sie das Sieb (11) an dem Schlitz berührt, der zwischen zwei Entwässerungsleisten (28) verbleibt.
EP06126500A 2006-01-27 2006-12-19 Verfahren und Vorrichtung zur Bildung einer Papier- oder Kartonbahn Not-in-force EP1813721B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20065056A FI120457B (fi) 2006-01-27 2006-01-27 Menetelmä ja laitteisto paperi- tai kartonkirainan muodostamiseksi

Publications (2)

Publication Number Publication Date
EP1813721A1 EP1813721A1 (de) 2007-08-01
EP1813721B1 true EP1813721B1 (de) 2008-12-03

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EP06126500A Not-in-force EP1813721B1 (de) 2006-01-27 2006-12-19 Verfahren und Vorrichtung zur Bildung einer Papier- oder Kartonbahn

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EP (1) EP1813721B1 (de)
AT (1) ATE416274T1 (de)
DE (1) DE602006003992D1 (de)
FI (1) FI120457B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9333468B2 (en) 2012-09-24 2016-05-10 Abengoa Bioenergy New Technologies, Llc Soak vessels and methods for impregnating biomass with liquid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE532154C2 (sv) * 2006-10-06 2009-11-03 Metso Paper Inc Dubbelvirapress innefattande tätningselement för avvattning av en fibersuspension

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29702548U1 (de) * 1997-02-14 1997-04-10 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Stoffauflauf einer Papiermaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9333468B2 (en) 2012-09-24 2016-05-10 Abengoa Bioenergy New Technologies, Llc Soak vessels and methods for impregnating biomass with liquid

Also Published As

Publication number Publication date
FI20065056A0 (fi) 2006-01-27
EP1813721A1 (de) 2007-08-01
DE602006003992D1 (de) 2009-01-15
FI20065056A (fi) 2007-07-28
ATE416274T1 (de) 2008-12-15
FI120457B (fi) 2009-10-30

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