EP0458799B1 - Vorrichtung zur herstellung eines bandes aus einer papierpulpe - Google Patents

Vorrichtung zur herstellung eines bandes aus einer papierpulpe Download PDF

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Publication number
EP0458799B1
EP0458799B1 EP90902035A EP90902035A EP0458799B1 EP 0458799 B1 EP0458799 B1 EP 0458799B1 EP 90902035 A EP90902035 A EP 90902035A EP 90902035 A EP90902035 A EP 90902035A EP 0458799 B1 EP0458799 B1 EP 0458799B1
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EP
European Patent Office
Prior art keywords
wire
stock
disposed
endless loop
water
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EP90902035A
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English (en)
French (fr)
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EP0458799A1 (de
Inventor
J. A. Turner
Paul T. Gray
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Beloit Corp
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Beloit Corp
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    • 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

Definitions

  • This invention relates to a forming apparatus for forming a web from stock. More particularly, the present invention relates to a forming apparatus for forming a web from stock ejected through a slice lip of a headbox into a forming section defined between a first and a second wire.
  • a headbox was disposed at the upstream end of a moving fourdrinier wire and stock was ejected from the slice lip of the headbox onto the forming wire such that water drained through the wire leaving a formed web on the top surface of the wire.
  • the speed of the former is considerably less than the speed of the former when forming lightweight grades because more time is required in draining the water from the larger quantity of stock used in the production of heavier grade webs.
  • the slice lip be disposed as close as possible to the upstream end of the forming section. If the headbox is disposed at a relatively considerable distance from the upstream end of the forming section, there exists a tendency for the trajectory of the jet of stock to be excessively curved and the angle of impingement of the stock relative to the lower wire to be increased to an unacceptable angle.
  • the impingement angle relative to the lower wire should be as small as possible so that as the jet impinges on the wire, minimum disturbance to the stock occurs and the stock impinges on the lower wire at a speed which is the same as that of the lower wire.
  • the present invention attains the aforementioned objective by substituting turning bars for the breast rolls disclosed in the aforementioned proposal as taught in US Patent No. 4,830,709.
  • Another object of the present invention is the provision of a twin-wire forming apparatus including a first and a second turning bar which permit the headbox slice lip to be disposed in close proximity to the first or upstream end of the forming section defined by the wires.
  • Another object of the present invention is the provision of a forming apparatus which includes at least two auto slices with means for adjusting the vacuum slots of the auto slices relative to the second wire for varying the amount of water removed from the second wire.
  • Another object of the present invention is the provision of a forming apparatus in which the forming section is disposed substantially horizontally.
  • Another object of the present invention is the provision of a forming apparatus in which the forming section follows a generally sinusoidal path from the first to the second end thereof.
  • Another object of the present invention is the provision of a vacuum box disposed between the first and the second vacuum slots and on the opposite side of the wires relative to the vacuum slots, the vacuum box having a curved surface which permits removal of water downwardly through the first wire and upward removal of water centrifugally through the second wire.
  • Another object of the present invention is the provision of a forming apparatus which includes at least one further vacuum slot disposed between the first and the second vacuum slot for upward removal of water through the second wire.
  • the present invention relates to a forming apparatus and method for forming a web from stock. More particularly, the present invention relates to a forming apparatus and method for forming a web from stock ejected through a slice lip of a headbox.
  • the apparatus includes a first wire which extends in an endless loop past the slice lip such that the stock is ejected through the slice lip onto the first wire.
  • a second wire extends in a further endless loop with the second wire cooperating with the first wire for defining therebetween a forming section having a first and a second end such that the web is formed during passage of the stock through the forming section.
  • a first turning bar is disposed within the endless loop and adjacent to the first end of the forming section such that the first wire is sandwiched between the stock and the first turning bar.
  • a second turning bar is disposed within the further endless loop and adjacent to the first end of the forming section such that the stock is disposed between the wires, the wires being disposed between the turning bars permitting the slice lip to be disposed in close proximity to the first end of the forming section.
  • a curved drainage means is disposed within the endless loop immediately downstream relative to the first turning bar for removing a first portion of water from the stock through the first wire and for removing a second portion of water centrifugally through the second wire during passage of the stock through the forming section and past the curved draining means.
  • a first vacuum slot is disposed within the further endless loop and extends in a cross-machine direction immediately downstream relative to the curved drainage means for removing a third portion of water from the stock through the second wire.
  • a vacuum box is disposed within the endless loop immediately downstream relative to the vacuum slot with the vacuum box defining a curved surface for removing a fourth portion of water from the stock through the first wire.
  • a second vacuum slot is disposed within the further endless loop and extends in a cross-machine direction downstream relative to the vacuum box for removing further water from the stock through the second wire.
  • a further curved drainage means is disposed within the further endless loop and immediately downstream relative to the second vacuum slot for removing water from the stock through the second wire. The curvature of the curved drainage means and the vacuum box is opposite to the curvature of the further curved drainage means such that the stock is progressively drained through both wires during passage through the forming section from the first towards the second end thereof.
  • the first wire is disposed relative to the slice lip such that the stock impinges on the first wire before contacting the second wire.
  • the forming section is disposed substantially horizontally and the forming section follows a generally sinusoidal path.
  • the turning bars are of ceramic material and the curved drainage means also includes a plurality of drainage slots which are connected to a source of partial vacuum.
  • the curved drainage means defines a face having a radius of curvature which is greater than the radius of curvature of the curved surface of the vacuum box.
  • the first vacuum slot is a first auto slice which includes adjusting means for adjusting the vertical and/or the angular position of the first vacuum slot relative to the second wire.
  • the adjusting means also permits movement of the first vacuum slot between the curved drainage means and the vacuum box.
  • the curved surface of the vacuum box permits centrifugal removal of a fifth portion of water from the stock through the second wire.
  • the forming apparatus includes an adjustable foil which is disposed within the endless loop between the vacuum box and the second vacuum slot for assisting removal of further water through the second vacuum slot.
  • the forming apparatus also includes a further vacuum slot which is disposed within the further endless loop and disposed between the first and second vacuum slots for removing water from the stock through the second wire.
  • the second vacuum slot is a second auto slice which includes further adjusting means for adjusting the second vacuum slot relative to the second wire for skimming the further water removed from the stock through the second wire.
  • the further curved drainage means also includes a plurality of cross-machine direction shoes defining therebetween a plurality of openings connected to a source of partial vacuum for removing water from the stock through the second wire.
  • the present invention also includes a method of forming a web from stock ejected through a slice lip of a headbox.
  • the method comprises the steps of moving a first wire, which extends in an endless loop, past the slice lip and then ejecting the stock through the slice lip onto the first wire.
  • the arrangement is such that the stock contacts the first wire at a minimal angle of impingement due to the first wire extending around a first turning bar disposed adjacent to the point of impingement of the stock onto the first wire.
  • the method includes the step of moving a second wire, which extends in a further endless loop, around a second turning bar such that the second turning bar is disposed adjacent to the first turning bar so that the slice lip is disposed in close proximity to a first end of the forming section defined between the wires.
  • the method includes the step of forming the web from the stock during passage of the stock through the forming section by progressively removing water from the stock through both wires.
  • the step of forming the web from stock during passage of the stock through the forming section includes removing a portion of water from the stock through a curved vacuum box disposed downstream and on the opposite side of the wires relative to a vacuum slot.
  • Figure 1 is a side-elevational view of a forming apparatus generally designated 10 according to a preferred embodiment of the present invention.
  • the forming apparatus 10 forms a web W from stock S ejected through a slice lip 12 of a headbox generally designated 14.
  • the apparatus 10 includes a first wire 16 which extends in an endless loop generally designated 18 past the slice lip 12 such that the stock S is ejected through the slice lip 12 onto the first wire 16.
  • a second wire 20 extends in a further endless loop generally designated 22.
  • the second wire 20 cooperates with the first wire 16 for defining therebetween a forming section generally designated 24 having a first and a second end 26 and 28, respectively, such that the web W is formed during passage of the stock S through the forming section 24.
  • a first turning bar 30 is disposed within the endless loop 18 and adjacent to the first end 26 of the forming section 24 such that the first wire 16 is sandwiched between the stock S and the first turning bar 30.
  • a second turning bar 32 is disposed within the further endless loop 22 and adjacent to the first end 26 of the forming section 24 such that the stock S is disposed between the wires 16 and 20.
  • the wires 16 and 20 respectively are disposed between the turning bars 30 and 32 respectively thereby permitting the slice lip 12 to be disposed in close proximity to the first end 26 of the forming section 24.
  • a curved drainage means generally designated 34 is disposed within the endless loop 18 immediately downstream relative to the first turning bar 30.
  • the drainage means 34 removes a first portion of water from the stock S through the first wire 16 and removes a second portion of water centrifugally through the second wire 20 during passage of the stock S through the forming section 24 and past the curved drainage means 34.
  • a first vacuum slot generally designated 36 is disposed within the further endless loop 22 and extends in a cross-machine direction immediately downstream relative to the curved drainage means 34 for removing a third portion of water from the stock S through the second wire 20.
  • a vacuum box 38 is disposed within the endless loop 18 immediately downstream relative to the vacuum slot 36.
  • the vacuum box 38 defines a curved surface 40 for removing a fourth portion of water from the stock S through the first wire 16 and removes another portion of water centrifugally through the second wire 20 during passage of the stock S through the forming section.
  • a second vacuum slot generally designated 42 is disposed within the further endless loop 22 and extends in a cross-machine direction downstream relative to the vacuum box 38 for removing further water from the stock S through the second wire 20.
  • a further curved drainage means generally designated 44 is disposed within the further endless loop and immediately downstream relative to the second vacuum slot 42 for removing water from the stock S through the second wire 20.
  • the curvature of the curved drainage means 34 and the vacuum box 38 are opposite to the curvature of the further curved drainage means 44 such that the stock S is progressively drained through both wires 16 and 20 respectively during passage through the forming section 24 from the first end 26 towards the second end 28 thereof.
  • the forming apparatus 10 is arranged such that the first wire 16 is disposed relative to the slice lip 12 so that the stock S impinges on the first wire 16 before contacting the second wire 22.
  • the forming section 10 is disposed substantially horizontally and the forming section 24 follows a generally sinusoidal path.
  • the turning bars 30 and 32 are of ceramic material.
  • Figure 2 is an enlarged fragmentary view of the drainage means 34 in which the curved drainage means 34 further includes a plurality of support foils 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62 and 63 which define therebetween a plurality of drainage slots 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80 and 81.
  • the plurality of drainage slots 64 to 81 are connected to a source of partial vacuum 82.
  • the curved drainage means 34 defines a face 84 having a radius of curvature which is greater than the radius of curvature of the curved surface 40 of the vacuum box 38.
  • the first vacuum slot 36 is a first auto slice 86 which includes adjusting means 88 for adjusting the angular and vertical position of the first vacuum slot 36 relative to the second wire 20.
  • the adjusting means 88 permits movement of the first vacuum slot 36 between the curved drainage means 34 and the vacuum box 38.
  • the curved surface 40 of the vacuum box 38 also permits centrifugal removal of a fifth portion of water from the stock S through the second wire 20.
  • Figure 3 is an enlarged fragmentary view showing the further curved drainage means or curved inverted vacuum boxes 44.
  • the forming apparatus 10 also includes an adjustable vacuum foil 90 which is disposed within the endless loop 18 between the vacuum box 38 and the second vacuum slot 42 for assisting removal of the further water through the second vacuum slot 42.
  • Figure 3 also shows the second vacuum slot 42 as a second auto slice 92 with the second auto slice 92 further including further adjusting means 94 for adjusting the second vacuum slot 42 relative to the second wire 20 for skimming the further water removed from the stock S through the second wire 20.
  • Figure 3 shows the further curved drainage means 44 as including a plurality of cross-machine direction shoes 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113 and 114 which define therebetween a plurality of openings 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131 and 132 connected to a source of partial vacuum (not shown) for removing water from the stock through the second wire 20.
  • a source of partial vacuum not shown
  • a forming apparatus generally designated 10A further includes a further vacuum slot 134 which is disposed within a further endless loop 18A and disposed between the first and the second vacuum slots 36A and 42A respectively for removing water from the stock through the second wire 20A.
  • high consistency stock S is ejected from the headbox 14 through the slice lip 12 such that the angle of impingement of the jet of stock relative to the first wire 16 is very small. Furthermore, the slice lip 12 is able to be disposed in very close proximity to the first end 26 of the forming section 24 due to the provision of the turning bars 30 and 32 respectively. Therefore, according to the present invention, when ejecting high consistency stock at relatively low machine speeds, the stock is deposited on the lower wire 16 with minimal disturbance of the stock.
  • a first portion of water is removed downwardly through the curved drainage means 34 and a second portion of water is removed upwardly through the second wire 20 due to the centrifugal force applied to the stock during passage of the stock through the forming section 24 around the curved drainage means 34.
  • the vacuum box 38 having a curved surface 40 results in a fifth portion of water being removed upwardly through the second wire 20.
  • the first wire 16 then passes over the foil 90 which assists the removal of a further portion of water through the second vacuum slot 42.
  • the wires then proceed to extend around at least one curved inverted vacuum box or further curved drainage means 44 for removing water through the second wire 20.
  • the curved drainage means 34 and vacuum box 38 have a radius of curvature which is opposite to the radius of curvature of the further curved drainage means 44 so that the forming section 24 follows a generally sinusoidal configuration from the first end 26 to the second end 28 of the forming section 24.
  • the operation of the apparatus shown in figure 4 is similar to the operation of the apparatus shown in figures 1-3 except in that a further auto slice 134 is used for assisting withdrawal of water upwardly through the wire 20A.
  • the aforementioned arrangement not only permits progressive drainage through both wires during passage through the forming section but also permits the high consistency stock to be ejected into the forming section with a minimum trajectory thereby improving formation and the two-sidedness of the resultant web.

Landscapes

  • Paper (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Replacement Of Web Rolls (AREA)

Claims (18)

  1. Formungsvorrichtung (10) zum Formen einer Bahn (W) aus Stoff (S), der über eine Austrittsspaltlippe (12) eines Stoffauflaufs (14) ausgestoßen wird, mit:
    einem ersten Sieb (16), das sich in einer endlosen Schleife (18) vorbei an der Austrittsspaltlippe (12) erstreckt, so daß der Stoff (S) über die Austrittsspaltlippe (12) auf das erste Sieb (16) ausgestoßen wird;
    einem zweiten Sieb (20), das sich in einer weiteren endlosen Schleife (22) erstreckt, wobei das zweite Sieb (20) mit dem ersten Sieb (16) zusammenwirkt, um zwischen ihnen einen Formungsabschnitt (24) zu bilden, der ein erstes und ein zweites Ende (26, 28) hat, so daß die Bahn (W) während der Passage des Stoffs (S) durch den Formungsabschnitt (24) geformt wird;
    einer ersten Umlenkstange (30), die in der endlosen Schleife (18) und an dem ersten Ende (26) des Formungsabschnitts (24) angeordnet ist, so daß das erste Sieb (16) zwischen dem Stoff (S) und der ersten Umlenkstange (30) angeordnet ist;
    einer zweiten Umlenkstange (32), die in der weiteren endlosen Schleife (22) und an dem ersten Ende (26) des Formungsabschnitts (24) angeordnet ist, so daß der Stoff (S) zwischen den Sieben (16, 20) angeordnet ist, wobei die Siebe (16, 20) zwischen den Umlenkstangen (30, 32) angeordnet sind, was gestattet, die Austrittsspaltlippe (12) in enger Nähe zu dem ersten Ende (26) des Formungsabschnitts (24) anzuordnen;
    einer gekrümmten Entwässerungseinrichtung (34), die innerhalb der endlosen Schleife (18) unmittelbar stromabwärts relativ zu der ersten Umlenkstange (30) angeordnet ist, um einen ersten Teil Wasser aus dem Stoff (S) durch das erste Sieb (16) und einen zweiten Teil Wasser zentrifugal durch das zweite Sieb (20) während der Passage des Stoffs (S) durch den Formungsabschnitt (24) und vorbei an der gekrümmten Entwässerungseinrichtung (34) zu entfernen;
    einem ersten Schlitz (36), der in der ersten endlosen Schleife (22) angeordnet ist und sich in Richtung quer zur Maschine unmittelbar stromabwärts relativ zu dem gekrümmten Entwässerungsabschnitt (34) erstreckt, um einen dritten Teil Wasser aus dem Stoff (S) über das zweite Sieb (20) zu entfernen;
    einem Kasten (38), der in der endlosen Schleife (18) unmittelbar stromabwärts relativ zu dem Schlitz (36) angeordnet ist, wobei der Kasten (38) eine gekrümmte Oberfläche (40) aufweist, um einen vierten Teil Wasser aus dem Stoff (S) über das erste Sieb (16) zu entfernen;
    einem zweiten Schlitz (42), der in der weiteren endlosen Schleife (22) angeordnet ist und sich in Richtung quer zur Maschine stromabwärts relativ zu dem Kasten (38) erstreckt, um weiteres Wasser aus dem Stoff (S) über das zweite Sieb (20) zu entfernen; und
    einer weiteren gekrümmten Entwässerungseinrichtung (44), die in der weiteren endlosen Schleife (22) und unmittelbar stromabwärts relativ zu dem zweiten Schlitz (42) angeordnet ist, um Wasser aus dem Stoff (S) über das zweite Sieb (20) zu entfernen, wobei die Krümmung der gekrümmten Entwässerungseinrichtung (34) und des Kastens (38) entgegengesetzt zu der Krümmung der weiteren gekrümmten Entwässerungseinrichtung (44) ist, so daß der Stoff (S) durch beide Siebe (16, 20) während der Passage durch den Formungsabschnitt (24) von dem ersten (26) zu dem zweiten Ende (28) desselben fortschreitend entwässert wird.
  2. Formungsvorrichtung (10) nach Anspruch 1, wobei das erste Sieb (16) relativ zu der Austrittsspaltlippe (12) so angeordnet ist, daß der Stoff (S) auf das erste Sieb (16) auftrifft, bevor er mit dem zweiten Sieb (20) in Berührung kommt.
  3. Formungsvorrichtung (10) nach Anspruch 1, wobei der Formungsabschnitt (24) im wesentlichen horizontal angeordnet ist.
  4. Formungsvorrichtung (10) nach Anspruch 1, wobei der Formungsabschnitt (24) einer insgesamt sinusförmigen Bahn folgt.
  5. Formungsvorrichtung (10) nach Anspruch 1, wobei die Umlenkstangen (30, 32) aus keramischem Material bestehen.
  6. Formungsvorrichtung (10) nach Anspruch 1, wobei die gekrümmte Entwässerungseinrichtung (34) weiter aufweist:
    mehrere Tragentwässerungsleisten (46-63), die zwischen sich mehrere Entwässerungsschlitze (64-81) begrenzen.
  7. Formungsvorrichtung (10) nach Anspruch 6, wobei die Entwässerungsschlitze (64-81) mit einer Teilvakuumquelle (82) verbunden sind.
  8. Formungsvorrichtung (10) nach Anspruch 1, wobei die gekrümmte Entwässerungseinrichtung (34) eine Stirnseite (84) aufweist, die einen Krümmungsradius hat, der größer als der Krümmungsradius der gekrümmten Oberfläche (40) des Kastens (38) ist.
  9. Formungsvorrichtung (10) nach Anspruch 1, wobei der erste Schlitz (36) ein erster automatischer Austrittsspalt (86) ist, mit:
    einer Einstelleinrichtung (88) zum Einstellen der Winkel-oder Vertikalposition des ersten Schlitzes (36) relativ zu dem zweiten Sieb (20).
  10. Formungsvorrichtung (10) nach Anspruch 9, wobei die Einstelleinrichtung (88) eine Bewegung des ersten Schlitzes (36) zwischen der gekrümmten Entwässerungseinrichtung (34) und dem Kasten (38) gestattet.
  11. Formungsvorrichtung (10) nach Anspruch 1, wobei die gekrümmte Oberfläche (40) des Kastens (38) das zentrifugale Entfernen eines fünften Teils Wasser aus dem Stoff (S) über das zweite Sieb (20) gestattet, wobei der Kasten (38) mit einer Partialdruckquelle verbunden ist.
  12. Formungsvorrichtung (10) nach Anspruch 1, weiter mit:
    einer einstellbaren Vakuumentwässerungsleiste (90), die in der endlosen Schleife (18) zwischen dem Kasten (38) und dem zweiten Schlitz (42) angeordnet ist, um das Entfernen des weiteren Wassers über den zweiten Schlitz (42) zu unterstützen.
  13. Formungsvorrichtung (10A) nach Anspruch 1, weiter mit:
    einem weiteren Schlitz (134), der in der weiteren endlosen Schleife (18A) und zwischen dem ersten und zweiten Schlitz (36A, 42A) angeordnet ist, um Wasser aus dem Stoff über das zweite Sieb (20A) zu entfernen.
  14. Formungsvorrichtung (10) nach Anspruch 1, wobei der zweite Schlitz (42) ein zweiter automatischer Austrittsspalt (92) ist, wobei der zweite automatische Austrittsspalt (92) weiter beinhaltet:
    eine weitere Einstelleinrichtung (94) zum Einstellen des zweiten Schlitzes (42) relativ zu dem zweiten Sieb (20), um das aus dem Stoff (S) über das zweite Sieb (20) entfernte weitere Wasser abzuschöpfen.
  15. Formungsvorrichtung (10) nach Anspruch 1, wobei die weitere gekrümmte Entwässerungseinrichtung (44) weiter aufweist:
    mehrere Schuhe (96-114) in Richtung quer zur Maschine, die zwischen sich mehrere Öffnungen (115-132) bilden, welche mit einer Teilvakuumquelle (nicht dargestellt) verbunden sind, um Wasser aus dem Stoff (S) über das zweite Sieb (20) zu entfernen.
  16. Formungsvorrichtung (10) zum Formen einer Bahn (W) aus Stoff (S), der über eine Austrittsspaltlippe (12) eines Stoffauflaufs (14) ausgestoßen wird, mit:
    einem ersten Sieb (16), das sich in einer endlosen Schleife (18) vorbei an der Austrittsspaltlippe (12) erstreckt, so daß der Stoff (S) über die Austrittsspaltlippe (12) auf das erste Sieb (16) ausgestoBen wird;
    einem zweiten Sieb (20), das sich in einer weiteren endlosen Schleife (22) erstreckt, wobei das zweite Sieb (20) mit dem ersten Sieb (16) zusammenwirkt, um zwischen ihnen einen Formungsabschnitt (24) zu bilden, der ein erstes und ein zweites Ende (26, 28) hat, so daß die Bahn (W) während der Passage des Stoffs (S) durch den Formungsabschnitt (24) geformt wird;
    einer ersten Umlenkstange (30), die in der endlosen Schleife (18) und an dem ersten Ende (26) des Formungsabschnitts (24) angeordnet ist, so daß das erste Sieb (16) zwischen dem Stoff (S) und der ersten Umlenkstange (30) angeordnet ist;
    einer zweiten Umlenkstange (32), die in der weiteren endlosen Schleife (22) und an dem ersten Ende (26) des Formungsabschnitts (24) angeordnet ist, so daß der Stoff (S) zwischen den Sieben (16, 20) angeordnet ist, wobei die Siebe (16, 20) zwischen den Umlenkstangen (30, 32) angeordnet sind, was gestattet, die Austrittsspaltlippe (12) in enger Nähe zu dem ersten Ende (26) des Formungsabschnitts (24) anzuordnen;
    einer gekrümmten Entwässerungseinrichtung (34), die innerhalb der endlosen Schleife (18) unmittelbar stromabwärts relativ zu der ersten Umlenkstange (30) angeordnet ist, um einen ersten Teil Wasser aus dem Stoff (S) durch das erste Sieb (16) und einen zweiten Teil Wasser zentrifugal durch das zweite Sieb (20) während der Passage des Stoffs (S) durch den Formungsabschnitt (24) und vorbei an der gekrümmten Entwässerungseinrichtung (34) zu entfernen;
    einem ersten Vakuumschlitz (36), der in der weiteren endlosen Schleife (22) angeordnet ist und sich in Richtung quer zur Maschine unmittelbar stromabwärts relativ zu der gekrümmten Entwässerungseinrichtung (34) erstreckt, um einen dritten Teil Wasser aus dem Stoff (S) über das zweite Sieb (20) zu entfernen;
    einem Vakuumkasten (38), der in der endlosen Schleife (18) unmittelbar stromabwärts relativ zu dem Vakuumschlitz (36) angeordnet ist, wobei der Vakuumkasten (38) eine gekrümmte Oberfläche (40) bildet, um einen vierten Teil Wasser aus dem Stoff (S) über das erste Sieb (16) zu entfernen;
    einem zweiten Vakuumschlitz (42), der in der weiteren endlosen Schleife (22) angeordnet ist und sich in Richtung quer zur Maschine stromabwärts relativ zu dem Vakuumkasten (38) erstreckt, um weiteres Wasser aus dem Stoff (S) über das zweite Sieb (20) zu entfernen; und
    einer weiteren gekrümmten Entwässerungseinrichtung (44), die in der weiteren endlosen Schleife (22) und unmittelbar stromabwärts relativ zu dem zweiten Schlitz (42) angeordnet ist, um Wasser aus dem Stoff (S) über das zweite Sieb (20) zu entfernen, wobei die Krümmung der gekrümmten Entwässerungseinrichtung (34) und des Kastens (38) entgegengesetzt zu der Krümmung der weiteren gekrümmten Entwässerungseinrichtung (44) ist, so daß der Stoff (S) durch beide Siebe (16, 20) während der Passage durch den Formungsabschnitt (24) von dem ersten (26) zu dem zweiten Ende (28) desselben fortschreitend entwässert wird.
  17. Verfahren zum Formen einer Bahn (W) aus einem Stoff (S) hoher Konsistenz, der über eine Austrittsspaltlippe (12) eines Stoffauflaufs (14) ausgestoßen wird, wobei das Verfahren die Schritte beinhaltet:
    Bewegen eines ersten Siebes (16), das sich in einer endlosen Schleife (18) erstreckt, vorbei an der Austrittsspaltlippe (12);
    Ausstoßen des Stoffes (S) über die Austrittsspaltlippe (12) auf das erste Sieb (16), so daß der Stoff (S) den ersten Draht (16) unter einem minimalen Auftreffwinkel berührt, weil sich der erste Draht (16) um eine Umlenkstange (30) erstreckt, die nahe dem Auftreffen des Stoffes (S) auf das erste Sieb (16) angeordnet ist;
    Bewegen eines zweiten Siebes (20), das sich in einer weiteren endlosen Schleife (22) erstreckt, um eine zweite Umlenkstange (32), so daß die zweite Umlenkstange (32) nahe der ersten Umlenkstange (30) und die Austrittsspaltlippe (12) in enger Nähe zu einem ersten Ende (26) eines Formungsabschnittes (24) angeordnet ist, der zwischen den Sieben (16, 20) gebildet ist; und
    Formen der Bahn (W) aus dem Stoff (S) während der Passage des Stoffes (S) durch den Formungsabschnitt (24) durch progressives Entfernen von Wasser aus dem Stoff (S) durch die beiden Siebe (16, 20).
  18. Verfahren zum Formen einer Bahn (W) nach Anspruch 17, wobei der Schritt des Formens der Bahn (W) aus dem Stoff (S) während der Passage des Stoffes (S) durch den Formungsabschnitt (24) beinhaltet:
    Entfernen eines Teils des Wassers aus dem Stoff (S) durch einen gekrümmten Vakuumkasten (38), der stromabwärts und auf der entgegengesetzten Seite der Siebe (16, 20) relativ zu einem ersten Vakuumschlitz (36) angeordnet ist.
EP90902035A 1989-02-16 1990-01-17 Vorrichtung zur herstellung eines bandes aus einer papierpulpe Expired - Lifetime EP0458799B1 (de)

Applications Claiming Priority (2)

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GB8903517 1989-02-16
GB898903517A GB8903517D0 (en) 1989-02-16 1989-02-16 A forming apparatus for forming a web from stock

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EP0458799A1 EP0458799A1 (de) 1991-12-04
EP0458799B1 true EP0458799B1 (de) 1993-06-09

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JP (1) JPH0726354B2 (de)
KR (1) KR0153748B1 (de)
AU (1) AU629901B2 (de)
BR (1) BR9007120A (de)
CA (1) CA2046588C (de)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084138A (en) * 1990-11-13 1992-01-28 Beloit Corporation Deflection compensated forming wire turning bar
DE4037017C2 (de) * 1990-11-20 1994-12-08 Escher Wyss Gmbh Naßteil einer Doppelsieb-Papiermaschine
JPH04194093A (ja) * 1990-11-28 1992-07-14 Mitsubishi Heavy Ind Ltd 抄紙機のツインワイヤホーマ
US5201999A (en) * 1991-06-10 1993-04-13 Beloit Technologies, Inc. Twin wire forming apparatus
CA2142262C (en) * 1992-08-19 1999-05-25 Paul T. Gray A multi-ply web forming apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856593B2 (ja) * 1980-09-08 1983-12-15 工業技術院長 低膨脹接着剤
DE3128156C2 (de) * 1981-07-16 1985-01-24 J.M. Voith Gmbh, 7920 Heidenheim Siebpartie einer Papiermaschine
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus

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WO1990009481A1 (en) 1990-08-23
KR0153748B1 (ko) 1998-12-01
GB8903517D0 (en) 1989-04-05
JPH0726354B2 (ja) 1995-03-22
CA2046588C (en) 1996-04-02
EP0458799A1 (de) 1991-12-04
AU629901B2 (en) 1992-10-15
JPH03505352A (ja) 1991-11-21
AU4943990A (en) 1990-09-05
FI913867A0 (fi) 1991-08-15
BR9007120A (pt) 1991-11-12
KR920701567A (ko) 1992-08-12
CA2046588A1 (en) 1990-08-17

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