A PRESS SECTION APPARATUS

Description

[0001] The present invention relates to a press section apparatus for pressing water from a formed web. More specifically, the present invention relates to an extended nip press.

Information Disclosure Statement

[0002] US-A-4,257,844 to Schmitt et al teaches a double felted vented nip press followed by a suction turning roll with a vented roll couple press disposed immediately downstream relative to the turning roll.

[0003] Furthermore, US-A-4,988,410 to Albrecht teaches an ENP, the bearing blanket and felt of which transport the pressed web past a further extended nip press shoe for removing further water from the web.

[0004] However, in the arrangement taught by the US-A-4 988 410 patent, the web is unstable after the first extended nip at the point of separation of the respective press felts. Accordingly, there is a tendency for high pressure air or steam within the first ENP to blow the web away from the press felt 11.

[0005] Additionally, with the US-A-4 988 410 arrangement, the web tends to be thrown off of the felt by centrifugal force as the web travels around the FLEX-O-NIP type roll upstream relative to the second extended nip press.

[0006] EP-A-0 289 477 describes a press apparatus including two extended nip presses downstream of successive nips formed by press roll couples in the first pressing stage.

[0007] In GB-A-2 127 449 there is described a press apparatus according to the preamble of claim 1. More specifically, GB-A-2 127 449 discloses a press section apparatus which includes first extended nip press for pressing a first portion of water from the web. A press pick-up felt loop extends through the first extended nip press and a suction turning roll is disposed downstream relative to the first extended nip press and within the pick-up felt loop for guiding the press felt and for urging the web towards and around the turning roll. A second extended nip press is disposed downstream relative to the turning roll. The pick-up felt extends through the second extended nip press. The second press includes a backing roll disposed on one side of the web having a smooth circumferential surface such that the web follows the surface when the web emerges from the second extended nip press. A transfer means transfers the web away from the smooth surface.

[0008] It is a primary objective of the present invention to overcome the aforementioned disadvantages of the prior art arrangements and to provide a press section apparatus which enables stabilization of the relatively wet web from the first extended nip press to the second extended nip press and which controls two-sidedness of the resultant web.

[0009] To achieve this, the press apparatus of the invention is characterized by the features claimed in the characterizing portion of claim 1.

[0010] Basically, in the press section apparatus according to the invention, the first extended nip press includes a first extended nip press shoe disposed within the loop of a second press felt which is disposed between the first extended nip press shoe and the web.

[0011] A first vented controlled deflection roll cooperates with the first shoe. The first roll is disposed within the loop defined by the pick-up felt. The arrangement is such that the web is disposed between the press felt and the second press felt. During movement of the press felt, the web and the second press felt are disposed between the first vented deflection roll and the first extended nip press shoe.

[0012] The first extended nip press further includes a vented extended nip press blanket which is disposed between the first extended nip press shoe and the second press felt.

[0013] A further press felt is disposed downstream relative to the smooth surface. The arrangement is such that the transfer means transfers the web from the smooth surface onto the further press felt.

[0014] Also, a third extended nip press is disposed downstream relative to the transfer means. The third extended nip press includes a further backing roll disposed on the opposite side of the web, thereby controlling two-sidedness of the resultant web.

[0015] According to the press section apparatus of the present invention, the web is fully supported between the first and second extended nip presses by the pick-up felt and two-sided ness of the resultant web is controlled by the third extended nip press.

[0016] In one embodiment of the present invention, the first extended nip press shoe is a hydrodynamic shoe, and in another embodiment cf the present invention, the first press shoe is a hydrostatic shoe.

[0017] The suction turning roll is connected to a source of partial vacuum such that the web is urged towards the press felt when the press felt and the second press felt diverge relative to each other.

[0018] The second extended nip press includes a second extended nip press shoe which is disposed within a loop defined by the press felt.

[0019] The press section apparatus also includes a second vented blanket which is disposed between the second extended nip press shoe and the press felt.

[0020] The second extended nip press shoe, according to one embodiment of the present invention, is a hydrodynamic shoe, and in another embodiment of the present invention, is a hydrostatic shoe.

[0021] The second extended nip press includes a second controlled deflection backing roll which cooperates with the second extended nip press shoe for removing a second portion of water from the web.

[0022] The transfer means includes a lead-in roll which is disposed in close proximity to the smooth surface and downstream relative to the second press shoe for leading the pressed web from the smooth surface towards the further press felt.

[0023] Additionally, the transfer means includes a suction transfer roll which is disposed within a further loop defined by the further press felt such that the web supported by the further press felt is guided from the lead-in roll towards the third extended nip press.

[0024] The third extended nip press includes a third extended nip press shoe which is disposed within the further loop.

[0025] Additionally, the third extended nip press includes a third vented blanket which is disposed between the third press shoe and the further press felt.

[0026] In one embodiment of the present invention, the third press shoe is a hydrodynamic shoe, and in another embodiment of the present invention, the third press shoe is a hydrostatic shoe.

[0027] The third extended nip press also includes a third controlled deflection controlled backing roll which cooperates with the third extended nip press shoe for pressing the web and for controlling two-sidedness of the resultant web.

Brief Description Of The Drawings

[0028] 

Figure 1 is a side-elevational view of the press section apparatus according to the present invention; and

Figure 2 is a similar view to that shown in Figure 1, but shows the respective extended nip presses having hydrostatic rather than hydrodynamic shoes.

Similar reference characters refer to similar parts throughout the various views of the drawings.

Detailed Description Of The Drawings

[0029] Figure 1 is a side-elevational view of a press section apparatus, generally designated 10 according to the present invention, for pressing water from a formed web W. The apparatus 10 includes a first extended nip press N1 for pressing a first portion of water from the web W.

[0030] A press felt 12 extends through the first extended nip press N1, and a suction turning roll 14 is disposed downstream relative to the first extended nip press N1 for guiding the press felt 12 and for urging the web W towards and around the turning roll 14.

[0031] A second extended nip press N2 is disposed downstream relative to the turning roll 14.

[0032] The second extended nip press N2 includes a backing roll 16 having a smooth circumferential surface 18 such that the web W follows the surface 18 when the web W emerges from the second extended nip press N2.

[0033] Transfer means, generally designated 20, transfer the web W away from the smooth surface 18 to a further press felt 22 which is disposed downstream relative to the smooth surface 18. The arrangement is such that the transfer means 20 transfers the web W from the smooth surface 18 onto the further press felt 22.

[0034] A third extended nip press N3 is disposed downstream relative to the transfer means 20 for controlling two-sidedness of the resultant web W.

[0035] The first extended nip press N1 includes a first extended nip press shoe 24. The press N1 also includes a second press felt 26 which is disposed between the first extended nip press shoe 24 and the web W.

[0036] A first vented controlled deflection roll 28 cooperates with the first shoe 24, the arrangement being such that the web W is disposed between the press felt 12 and the second press felt 26 during movement of the press felt 12, the web W and the second press felt 26 between the first vented deflection roll 28 and the first extended nip press shoe 24.

[0037] The first extended nip press N1 also includes a vented extended nip press blanket 30 which is disposed between the first extended nip press shoe 24 and the second press felt 26.

[0038] As shown in Figure 1, the first extended nip press shoe 24 is a hydrodynamic shoe.

[0039] However, in an alternative embodiment of the present invention as shown in Figure 2, the first extended nip press shoe 24A is a hydrostatic shoe.

[0040] The suction turning roll 14 is connected to a source of partial vacuum 32 such that the web W is urged towards the press felt 12 when the press felt 12 and the second press felt 26 diverge relative to each other.

[0041] The second extended nip press N2 includes a second extended nip press shoe 34 which is disposed within a loop defined by the press felt 12.

[0042] The press section apparatus 10 also includes a second vented blanket 36 which is disposed between the second extended nip press shoe 34 and the press felt 12.

[0043] In one embodiment of the present invention, the second extended nip press shoe is a hydrodynamic shoe, as indicated in Figure 1, and in a second embodiment of the present invention as shown in Figure 2, the second extended nip press shoe 34A is a hydrostatic shoe.

[0044] The second extended nip press N2 includes the backing roll 16 which is a second controlled deflection backing roll. The backing roll 16 cooperates with the second extended nip press shoe 34 for removing a second portion of water from the web W.

[0045] The transfer means 20 includes a lead-in roll 38 which is disposed in close proximity to the smooth surface 18 and downstream relative to the second press shoe 34 for leading the pressed web W from the smooth surface 18 towards the further press felt 22.

[0046] The transfer means 20 also includes a suction transfer roll 40 which is disposed within a further loop defined by the further press felt 22. The arrangement is such that the web W supported by the further press felt 22 is guided from the lead-in roll 38 towards the third extended nip press N3.

[0047] The third extended nip press N3 includes a third extended nip press shoe 42 disposed within the further loop.

[0048] The third extended nip press shoe 42 cooperates with a third vented blanket 44 which is disposed between the third press shoe 42 and the further press felt 22.

[0049] In the embodiment shown in Figure 1, the third press shoe 42 is a hydrodynamic shoe, whereas in Figure 2, the third press shoe 42A is a hydrostatic shoe.

[0050] The third extended nip press N3 also includes a third controlled deflection controlled backing roll 46 which cooperates with the third extended nip press shoe 42 for pressing the web W and for controlling two-sidedness of the resultant web.

[0051] Figure 2 shows an alternative embodiment of the present invention in which each of the press shoes 24A,34A and 42A is a hydrostatic shoe, rather than a hydrodynamic shoe. In other respects, the arrangement shown in Figure 2 is identical to that shown in Figure 1, and similar reference characters are used to identify similar parts, such numerals having the suffix "A" added thereto.

[0052] In operation of the press section apparatus according to the present invention, the web is fully supported through the first extended nip press N1A between cooperating felts 12A and 26A. Subsequently, the suction turning roll 14 guides the web supported by the felt 12 so that the web W is guided through the second nip N2. The arrangement particularly enables stabilization of the relatively wet web from the first extended nip press N1 to the second extended nip press N2.

[0053] The web adheres to the smooth surface 18 of the backing roll 16 and is doctored therefrom so that a tail can be threaded under the lead roll 38 and drawn onto the further felt 22 for guidance through the third nip press N3.

[0054] The present invention provides a significant improvement over the prior art presses and avoids the problem of blowing the unstable pressed web away from a supporting press felt when such web emerges from a first extended nip press.

Claims

1. a press section apparatus (10) for pressing water form a formed web (W), said apparatus comprising:

a first extended nip press (N1) for pressing a first portion of water from the web (W), said first extended nip press (N1) including a first extended nip press shoe (24), a first vented roll (28) cooperating with said first shoe (24) and an extended nip press blanket (30) disposed between said first shoe (24) and the web (W);

a press pick-up felt (12) loop and a second press felt (26) loop extending through said first extended nip press (N1), the arrangement being such that the web (W) is disposed between said press pick-up felt (12) and said second press felt (26) during movement of said press pick-up felt (12), the web (W) and said second press felt (26) between said first vented roll (28) and said first extended nip press shoe (24);

a suction turning roll (14) disposed downstream relative to said first extended nip press (N1) and within said press pick-up felt (12) loop for guiding said pick-up press felt (12) and for urging the web (W) towards and around said turning roll (14);

a second extended nip press (N2) disposed downstream relative to said turning roll (14);

said press pick-up felt (12)extending through said second extended nip press (N2);

   said second extended nip press (N2) including:

a backing roll (16) disposed on one side of the web (W), said backing roll (16) having a smooth circumferential surface (18) structured and arranged so that the web (W) follows said surface (18) when the web (W) emerges from said second extended nip press (N2) ; and

transfer means (20) for transferring the web (W) away from said smooth surface (18),

   characterized in that

said first extended nip press shoe (24) is disposed within the loop defined by said second press felt (26),

said second press felt (26) being disposed between said first extended nip press shoe (24) and the web (W),

that said first vented roll (28) is a vented controlled deflection roll, said first vented controlled deflection roll (28) being disposed within the loop defined by said press pick-up felt (12), and

that said extended nip press blanket (30) is a vented extended nip press blanket which is disposed between said first extended nip press shoe (24) and said second press felt (26), said apparatus further comprising

a further press felt (22) disposed downstream relative to said smooth surface (18), the arrangement being such that said transfer means (20) transfers the web (W) from said smooth surface (18) onto said further press felt (22); and

a third extended nip press (N3) disposed downstream relative to said transfer means (20), said third extended nip press (N3) including a further backing roll (46) which is disposed on the opposite side of the web (W), thereby controlling two-sidedness of the resultant web (W).

2. A press section apparatus as set forth in claim 1, characterized in that said first extended nip press shoe (24) is a hydrodynamic shoe.

3. A press section apparatus as set forth in claim 1, characterized in that said first extended nip press shoe (24A) is a hydrostatic shoe.

4. A press section apparatus as set forth in claim 1, characterized in that said suction turning roll (14) is connected in a source of partial vacuum (32) such that the web (W) is urged towards said press pick-up felt (12) when said press pick-up felt (12) and said second press felt (26) diverge relative to each other.

5. A press section apparatus as set forth in claim 1, characterized in that said second extended nip press (N2) includes :

a second extended nip press shoe (34) disposed within said loop defined by said press pick-up felt (12).

6. A press section apparatus as set forth in claim 5, characterized in further including a vented blanket (36) disposed between said second extended nip press shoe (34) and said press pick-up felt (12).

7. A press section apparatus as set forth in claim 5, characterized in that said second extended nip press shoe (34) is a hydrodynamic shoe.

8. A press section apparatus as set forth in claim 5, characterized in that said second extended nip press shoe (34A) is a hydrostatic shoe.

9. A press section apparatus as set forth in claim 5, characterized in that said backing roll (16) in said second extended nip press (N2) is a second controlled deflection backing roll (16) which cooperates with said second extended nip press shoe (34) for removing a second portion of water from the web (W).

10. A press section apparatus as set forth in claim 1, characterized in that said transfer means (20) includes:

a lead-in roll (38) disposed in close proximity to said smooth surface (18) and downstream relative to said press shoe (34) for leading the pressed web (W) from said smooth surface (18) towards said further press felt (22),

a suction transfer roll (40) disposed within a further loop defined by said further press felt (22) such that the web (W) supported by said further press felt (22) is guided from said lead-in roll (38) towards said third extended nip press (N3).

11. A press section apparatus as set forth in claim 10, characterized in that said third extended nip press (N3) includes:

an extended nip press shoe (42) disposed within said further loop.

12. A press section apparatus as set forth in claim 11, characterized in that said third extended nip press (N3) includes:

a vented blanket (44) disposed between said press shoe (42) disposed within said further loop and said further press felt (22).

13. A press section apparatus as set forth in claim 11, characterized in that said press shoe (42) disposed within said further loop is a hydrodynamic shoe.

14. A press section apparatus as set forth in claim 11, characterized in that said press shoe (42A) disposed within said further loop is a hydrostatic shoe.

15. A press section apparatus as set forth in claim 11, characterized in that said further backing roll (46) in said third extended nip press (N3) is a controlled deflection backing roll (46) which cooperates with said extended nip press shoe (42) disposed within said further loop for pressing the web (W) and for controlling two-sidedness of the resultant web.

Ansprüche

1. Pressenpartievorrichtung (10) zum Pressen von Wasser aus einer gebildeten Bahn (W), wobei die Vorrichtung aufweist:

eine erste Presse (N1) mit ausgedehnter Preßzone zum Pressen eines ersten Teils von Wasser aus der Bahn (W), wobei die erste Presse (N1) mit ausgedehnter Preßzone einen ersten Schuh (24) der ersten Presse mit ausgedehnter Preßzone, eine erste belüftete Walze (28), die mit dem ersten Schuh (24) zusammenwirkt, und eine Decke (30) der Presse mit ausgedehnter Preßzone, welche zwischen dem ersten Schuh (24) und der Bahn (W) angeordnet ist, aufweist;

eine Schleife eines ersten Abnahmefilzes (12) und eine Schleife eines zweiten Preßfilzes (26), die sich durch die erste Presse (N1) mit ausgedehnter Preßzone erstrecken, wobei die Anordnung so getroffen ist, daß die Bahn (W) zwischen dem Pressenabnahmefilz (12) und dem zweiten Preßfilz (26) während der Bewegung des Pressenabnahmefilzes (12), der Bahn (W) und des zweiten Preßfilzes (26) zwischen der ersten belüfteten Walze (28) und dem Schuh (24) der ersten Presse mit ausgedehnter Preßzone angeordnet ist;

eine Saugumlenkwalze (14), die relativ zu der ersten Presse (N1) mit ausgedehnter Preßzone stromabwärts und innerhalb der Schleife des Pressenabnahmefilzes (12) angeordnet ist, um den Abnahmepreßfilz (12) zu führen und um die Bahn (W) zu der und um die Umlenkwalze (14) zu drängen;

eine zweite Presse (N2) mit ausgedehnter Preßzone, die relativ zu der Umlenkwalze (14) stromabwärts angeordnet ist;

wobei sich der Pressenabnahmefilz (12) durch die zweite Presse (N2) mit ausgedehnter Preßzone erstreckt;

wobei die zweite Presse (N2) mit ausgedehnter Preßzone aufweist:

eine Gegenwalze (16), die auf einer Seite der Bahn (W) angeordnet ist, wobei die Gegenwalze (16) eine glatte Umfangsoberfläche (18) hat, die so strukturiert und angeordnet ist, daß die Bahn (W) der Oberfläche (18) folgt, wenn die Bahn (W) aus der zweiten Presse (N2) mit ausgedehnter Preßzone austritt; und

eine Überführeinrichtung (20) zum Überführen der Bahn (W) von der glatten Oberfläche (18) aus,

dadurch gekennzeichnet,

daß der Schuh (24) der ersten Presse mit ausgedehnter Preßzone innerhalb der durch den zweiten Preßfilz (26) gebildeten Schleife angeordnet ist,

daß der zweite Preßfilz (26) zwischen dem Schuh (24) der ersten Presse mit ausgedehnter Preßzone und der Bahn (W) angeordnet ist,

daß die erste belüftete Walze (28) eine belüftete Walze mit gesteuerter Durchbiegung ist, wobei die erste belüftete Walze (28) mit gesteuerter Durchbiegung innerhalb der durch den Pressenabnahmefilz (12) gebildeten Schleife angeordnet ist, und

daß die Decke (30) der Presse mit ausgedehnter Preßzone eine belüftete Decke der Presse mit ausgedehnter Preßzone ist, die zwischen dem Schuh (24) der ersten Presse mit ausgedehnter Preßzone und dem zweiten Preßfilz (26) angeordnet ist, wobei die Vorrichtung weiter aufweist:

einen dritten Preßfilz (22), der relativ zu der glatten Oberfläche (18) stromabwärts angeordnet ist, wobei die Anordnung so getroffen ist, daß die Überführeinrichtung (20) die Bahn (W) von der glatten Oberfläche (18) auf den weiteren Preßfilz (20) überführt; und

eine dritte Presse (N3) mit ausgedehnter Preßzone, die relativ zu der Überführeinrichtung (20) stromabwärts angeordnet ist, wobei die dritte Presse (N3) mit ausgedehnter Preßzone eine weitere Gegenwalze (46) aufweist, die auf der entgegengesetzten Seite der Bahn (W) angeordnet ist, um dadurch die Zweiseitigkeit der resultierenden Bahn (W) zu steuern.

2. Pressenpartievorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Schuh (24) der ersten Presse mit ausgedehnter Preßzone ein hydrodynamischer Schuh ist.

3. Pressenpartievorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Schuh (24A) der ersten Presse mit ausgedehnter Preßzone ein hydrostatischer Schuh ist.

4. Pressenpartievorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Saugumlenkwalze (14) an eine Teilvakuumquelle (32) angeschlossen ist, so daß die Bahn (W) zu dem Pressenabnahmefilz (12) gedrängt wird, wenn der Pressenabnahmefilz (12) und der zweite Preßfilz (26) relativ zueinander divergieren.

5. Pressenpartievorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Presse (N2) mit ausgedehnter Preßzone aufweist:

einen Schuh (34) der zweiten Presse mit ausgedehnter Preßzone, der innerhalb der durch den Pressenabnahmefilz (12) gebildeten Schleife angeordnet ist.

6. Pressenpartievorrichtung nach Anspruch 5, gekennzeichnet weiter durch eine belüftete Decke (36), die zwischen dem Schuh (34) der zweiten Presse mit ausgedehnter Preßzone und dem Pressenabnahmefilz (12) angeordnet ist.

7. Pressenpartievorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Schuh (34) der zweiten Presse mit ausgedehnter Preßzone ein hydrodynamischer Schuh ist.

8. Pressenpartievorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Schuh (34A) der zweiten Presse mit ausgedehnter Preßzone ein hydrostatischer Schuh ist.

9. Pressenpartievorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Gegenwalze (16) in der zweiten Presse (N2) mit ausgedehnter Preßzone eine zweite Gegenwalze (16) mit gesteuerter Durchbiegung ist, die mit dem Schuh (34) der zweiten Presse mit ausgedehnter Preßzone zusammenwirkt, um einen zweiten Teil von Wasser aus der Bahn (W) zu entfernen.

10. Pressenpartievorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Überführeinrichtung (20) aufweist:

eine Einführwalze (38), die in enger Nähe zu der glatten Oberfläche (18) und relativ zu dem Preßschuh (34) stromabwärts angeordnet ist, um die gepreßte Bahn (W) von der glatten Oberfläche (18) aus zu dem weiteren Preßfilz (22) zu führen, und

eine Saugüberführwalze (40), die innerhalb einer durch den weiteren Preßfilz (22) gebildeten Schleife angeordnet ist, so daß die durch den weiteren Preßfilz (22) abgestützte Bahn (W) von der Einführwalze (38) aus zu der dritten Presse (N3) mit ausgedehnter Preßzone geführt wird.

11. Pressenpartievorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die dritte Presse (N3) mit ausgedehnter Preßzone aufweist:

einen Schuh (42) der Presse mit ausgedehnter Preßzone, welcher innerhalb der weiteren Schleife angeordnet ist.

12. Pressenpartievorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die dritte Presse (N3) mit ausgedehnter Preßzone aufweist:

eine belüftete Decke (44), die zwischen dem Preßschuh (42), der in der weiteren Schleife angeordnet ist, und dem weiteren Preßfilz (22) angeordnet ist.

13. Pressenpartievorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß der Preßschuh (42), der in der weiteren Schleife angeordnet ist, ein hydrodynamischer Schuh ist.

14. Pressenpartievorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß der Preßschuh (42A), der in der weiteren Schleife angeordnet ist, ein hydrostatischer Schuh ist.

15. Pressenpartievorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die weitere Gegenwalze (46) in der dritten Presse (N3) mit ausgedehnter Preßzone eine Gegenwalze (46) mit gesteuerter Druchbiegung ist, die mit dem Schuh (42) der Presse mit ausgedehnter Preßzone, welcher in der weiteren Schleife angeordnet ist, zusammenwirkt, um die Bahn (W) zu pressen und um die Zweiseitigkeit der resultierenden Bahn zu steuern.

Revendications

1. Appareil (10) pour la section de presses pour presser de l'eau d'une bande façonnée (W), ledit appareil comprenant:

une première presse à écartement étendu (N1) pour presser une première portion d'eau de la bande (W), ladite première presse à écartement étendu (NI) englobant un premier sabot (24) pour la section de presses à écartements étendus, un premier cylindre rainuré (28) coopérant avec ledit premier sabot (24) et un blanchet (30) pour la section de presses à écartements étendus disposé entre ledit premier sabot (24) et la bande (W);

un feutre preneur (12) pour la section de presses s'étendant en boucle et un deuxième feutre (26) pour la section de presses s'étendant en boucle à travers ladite première presse à écartement étendu (N1), l'arrangement étant tel que la bande (W) est disposée entre ledit feutre preneur (12) pour la section de presses et ledit deuxième feutre (26) pour la section de presses au cours du mouvement dudit feutre preneur (12) pour la section de presses, de la bande (W) et dudit deuxième feutre (26) pour la section de presses entre ledit premier cylindre rainuré (28) et ledit premier sabot (24) pour la section de presses à écartements étendus;

un cylindre rotatif d'aspiration (14) disposé en aval par rapport à ladite première presse à écartement étendu (N1) et à l'intérieur de la boucle formée par ledit feutre preneur (12) pour la section de presses pour guider ledit feutre preneur (12) pour la section de presses et pour presser la bande (W) en direction et autour dudit cylindre rotatif (14);

une deuxième presse à écartement étendu (N2) disposée en aval par rapport audit cylindre rotatif (14);

ledit feutre preneur (12) pour la section de presses s'étendant à travers ladite deuxième presse à écartement étendu (N2) ;

   ladite deuxième presse à écartement étendu (N2) englobant:

un cylindre de support (16) disposé d'un côté de la bande (W), ledit cylindre de support (16) possédant une surface circonférentielle lisse (18) structurée et arrangée de telle sorte que la bande (W) suit ladite surface (18) lorsque la bande (W) ressort de ladite deuxième presse à écartement étendu (N2); et

un moyen de transfert (20) pour transférer la bande (W) à l'écart de ladite surface lisse (18),

   caractérisé en ce que

ledit premier sabot (24) pour la section de presses à écartements étendus est disposé dans la boucle définie par ledit deuxième feutre (26) pour la section de presses,

ledit deuxième feutre (26) pour la section de presses est disposé entre ledit premier sabot (24) pour la section de presses à écartements étendus et la bande (W),

ledit premier cylindre rainuré (28) est un cylindre rainuré à flexion réglée, ledit premier cylindre rainuré à flexion réglée (28) étant disposé à l'intérieur de la boucle définie par ledit feutre preneur (12) pour la section de presses, et

   ledit blanchet (30) pour la section de presses à écartements étendus est un blanchet rainuré pour la section de presses à écartements étendus qui est disposé entre ledit premier sabot (24) pour la section de presses à écartements étendus et ledit deuxième feutre (26) pour la section de presses, ledit appareil comprenant en outre:

un feutre supplémentaire (22) pour la section de presses disposé en aval par rapport à ladite surface lisse (18), l'arrangement étant tel que ledit moyen de transfert (20) transfère la bande (W) depuis ladite surface lisse (18) sur ledit feutre supplémentaire (22) pour la section de presses; et

une troisième presse à écartement étendu (N3) disposée en aval par rapport audit moyen de transfert (20), ladite troisième presse à écartement étendu (N3) englobant un cylindre de support supplémentaire (46) qui est disposé sur le côté opposé de la bande (W), pour ainsi régler la bilatéralité de la bande résultante (W).

2. Appareil pour la section de presses selon la revendication 1, caractérisé en ce que ledit premier sabot (24) pour la section de presses à écartements étendus est un sabot hydrodynamique.

3. Appareil pour la section de presses selon la revendication 1, caractérisé en ce que ledit premier sabot (24A) pour la section de presses à écartements étendus est un sabot hydrostatique.

4. Appareil pour la section de presses selon la revendication 1, caractérisé en ce que ledit cylindre rotatif d'aspiration (14) est raccordé à une source de vide partiel (32) de telle sorte que la bande (W) est pressée contre ledit feutre preneur (12) pour la section de presses lorsque ledit feutre preneur (12) pour la section de presses et ledit deuxième feutre (26) pour la section de presses s'écartent l'un de l'autre.

5. Appareil pour la section de presses selon la revendication 1, caractérisé en ce que ladite deuxième presse à écartement étendu (N2) englobe:

un deuxième sabot (34) pour la section de presses à écartements étendus disposé à l'intérieur de ladite boucle définie par ledit feutre preneur (12) pour la section de presses.

6. Appareil pour la section de presses selon la revendication 5, caractérisé en ce qu'il englobe en outre un blanchet rainuré (36) disposé entre ledit deuxième sabot (34) pour la section de presses à écartements étendus et ledit feutre preneur (12) pour la section de presses.

7. Appareil pour la section de presses selon la revendication 5, caractérisé en ce que ledit deuxième sabot (34) pour la section de presses à écartements étendus est un sabot hydrodynamique.

8. Appareil pour la section de presses selon la revendication 5, caractérisé en ce que ledit deuxième sabot (34A) pour la section de presses à écartements étendus est un sabot hydrostatique.

9. Appareil pour la section de presses selon la revendication 5, caractérisé en ce que ledit cylindre de support (16) dans ladite deuxième presse à écartement étendu (N2) est un deuxième cylindre de support à flexion réglée (16) qui coopère avec ledit deuxième sabot (34) pour la section de presses à écartements étendus pour éliminer une seconde portion d'eau de la bande (W).

10. Appareil pour la section de presses selon la revendication 1, caractérisé en ce que ledit moyen de transfert (20) englobe:

un cylindre d'entrée (38) disposé à proximité étroite de ladite surface lisse (18) et en aval par rapport audit sabot (34) pour la section de presses pour amener la bande pressée (W) depuis ladite surface lisse (18) en direction dudit feutre supplémentaire (22) pour la section de presses,

un cylindre d'aspiration-transfert (40) disposé à l'intérieur d'une boucle supplémentaire définie par ledit feutre supplémentaire (22) pour la section de presses de telle sorte que la bande (W) supportée par ledit feutre supplémentaire (22) pour la section de presses est guidée depuis ledit cylindre d'entrée (38) en direction de ladite troisième presse à écartement étendu (N3).

11. Appareil pour la section de presses selon la revendication 10, caractérisé en ce que ladite troisième presse à écartement étendu (N3) englobe:

un sabot (40) pour la section de presses à écartements étendus disposé à l'intérieur de ladite boucle supplémentaire.

12. Appareil pour la section de presses selon la revendication 11, caractérisé en ce que ladite troisième presse à écartement étendu (N3) englobe:

un blanchet rainuré (44) disposé entre ledit sabot (42) pour la section de presses disposé à l'intérieur de ladite boucle supplémentaire et ledit feutre supplémentaire (22) pour la section de presses.

13. Appareil pour la section de presses selon la revendication 11, caractérisé en ce que ledit sabot (42) pour la section de presses disposé à l'intérieur de ladite boucle supplémentaire est un sabot hydrodynamique.

14. Appareil pour la section de presses selon la revendication 11, caractérisé en ce que ledit sabot (42A) pour la section de presses disposé à l'intérieur de ladite boucle supplémentaire est un sabot hydrostatique.

15. Appareil pour la section de presses selon la revendication 11, caractérisé en ce que ledit cylindre de support supplémentaire (46) dans ladite troisième presse à écartement étendu (N3) est un cylindre de support à flexion réglée (46) qui coopère avec ledit sabot (42) pour la section de presses à écartements étendus disposé à l'intérieur de ladite boucle supplémentaire pour presser la bande (W) et pour régler la bilatéralité de la bande résultante.

Drawing