FI111860B - Roll with a long press nip and a press section in a paper machine applying it - Google Patents

Abstract

The invention relates to an extended-nip press roll (10) for a paper machine, comprising a stationary central axle (15), a loading shoe (11), and hydraulic loading elements (12) situated between the stationary axle (15) and the loading shoe (11), by means of which elements an active frontal face (18) of the loading shoe (11) is pressed against an inner face fo a flexible hose mantle (16) of the extended-nip press roll (10) in order to produce a compression pressure in an extended-nip zone (EN; EN1;EN2) formed by said extended-nip press roll with its backup roll (20). The loading shoe (11) and its loading and oil-drain arrangements are substantially symmetrical in relation to the axial centre plane (K-K) of the extended-nip press roll (10) so that the direction of rotation of the hose mantle (16) may be either direction and as required by the position of the extended-nip press roll (10). In addition, press section geometries applying these extended-nip press rolls (10) are presented.

Description

111860

Long nip press roll and papermaking press section

The invention relates to a paper machine long nip press roll as defined in the preamble of claim 1.

The invention further relates to a press section of a papermaking machine as defined in the preamble of claim 5.

15

Prior art long nip rolls, i.e. hose reels, are designed and constructed to have a specific direction of rotation, and known rolls do not operate in the opposite direction because the press shoe structure and the oil recycling and discharge systems do not allow rotation of the rotation. However, today, press sections employing long nip zones and long nip press rolls employ two or even more long nip rolls, which are arranged so that the direction of rotation of their hose diaper in the above long nip rolls,, ··, ·. since the long nip roll is in the same press section with both upper and lower portions; 25 thios. This results in the long nip rolls being particularly mouth-watering! to be rotated, which increases manufacturing and * spare parts costs. In addition, these multi-nip long nip clamps must have their own • long nip freewheel for both directions of rotation. This significantly increases the cost of capital, warehousing and spare parts, as the typical cost of a long nozzle hose reel is in the range of 5 to 15 M FIM.

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For the known structures of long nip rolls, or hose reels, the following references in the applicant's patent application FI-830995, FI-892517, FI-892518, FI-925943 and FI943041 are referred to by way of example.

* · • · · • 111860 2

The main object of the present invention is to eliminate the drawbacks discussed above and to provide a new long nip press roll and papermaking press section solutions thereof.

In order to achieve the foregoing and later objects, the long nip press roll according to the invention is essentially characterized in what is stated in the characterizing part of claim 1.

The press section according to the invention, in turn, is essentially characterized by what is stated in the characterizing section of claim 5.

The structure of the long nip press roll according to the invention is such that its direction of rotation can be changed without changing the internal structure of the roll. This is advantageous because, for example, in a press section comprising two long nipples, the long nip rolls can be exactly the same, even though their positions and directions of rotation are opposite. In this case, the pre-assembled spare long nip roller fits into demanding positions with different manual rotation directions. There are also advantages in designing and manufacturing long nip rolls when the roll direction of rotation can be either '* · so that only one type of long nip rolls and their spare:: ί rolls are required.

The lubricating oil drainage system of the long nip press roll according to the invention is such that the lubricating oil is discharged from the roll in both rotational directions, with the press shoe in either the upper or lower position or even in the intermediate position. in the chamber area of the hydrostatic central area of the front and rear edges of the shoes 30. The compression shoe is shaped i · · '· * “to minimize paper breakage of the conveyor belt in the hydrostatic chamber area.

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• · 3 111860 change of direction, the lubrication of the press shoe is secured by the press shoe tilt system, which allows the pressure at the front of the shoe to be lower than the pressure at the rear.

The invention also encompasses clamping parts applying the same longitudinal nip press rolls according to the invention having at least two long nip rolls according to the invention which are in positions with each other in the direction of rotation and which form a long nip zone with their counter rolls. The counter roll may be e.g. a plain-faced central roll of the applicant's Sym-Press II ™ press section, or the press section may comprise at least two consecutive separate long nip press zones between which the web preferably has closed passage provided by press fabrics and suction transfer rolls and / or known to exploit-15.

In the following, the invention will be described in detail with reference to certain embodiments of the invention shown in the figures of the accompanying drawings, in which details the invention is not limited in any way.

Figure 1 shows a long nip press roll according to the invention in a lower position with a counter roll in the lower position forming a long nip zone.

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Fig. 1A shows, similarly to Fig. 1, a long nip press roll of the invention and an embodiment of a press shoe thereof in which the hydrostatic chamber is provided with circular arcs.

Fig. IB is a sectional view of the compression shoe IB-IB of Fig. IA in Fig. IA: · ', i.e., a transverse section of the machine.

Fig. 2 shows an elongated nip press roll ... identical to Fig. 1 in an upper position such that the direction of rotation of the long nip roll is opposite to that of the long nip roll of Fig. 1.

4, 111860

Fig. 3 is an axonometric view of the press shoe of the long nip press roll of Figs.

Fig. 4 is an axial vertical cross-sectional view of the long nip press 5 along line IV-IV in Fig. 1.

Figure 5 shows the applicant's Sym-Press II ™ press section using two long nip press rolls according to the invention in different hand positions.

10

Fig. 6 shows a paper machine press section with two successive long nip rolls according to the invention, utilizing a fully enclosed outlet from the forming wire to a drying wire and having the long nip press rolls in different hand positions.

15

The long nip press shown in Figures 1,1A, 2 and 4 comprises a long nip press roll 10 (later hose roll 10) of the invention and a counter roll which is a flat roll jacket 21. Alternatively, the counter roll 20 may be a deflected roll 20 which may also have an on surface. the paper web W passes through the long nip zone EN between two felts. As shown in Figures 1,1A and 2, a conveyor belt 16, a press felt 22 and a paper to be squeezed by a press shoe 11 in its area AA pass through the long nip zone EN in Figures 1 and 2 on the other side: 25 against the outer surface of the loop of the water receiving press felt 22; :; one side against the smooth surface 21 of the counter roll 20.

In accordance with the present invention, the hose reel 10 is symmetrical in structure with respect to its axial center plane K-K. In part, this allows the hose reel 10 of the same structure to be used in the lower position shown in Figures 1, IA and 4 and in the upper position shown in Figure 2. In the lower position of Figs. T >> * 1, IA and 4, the direction of rotation of the hose diaper 16 is opposite to the direction of rotation of the hose diaper 16 at the upper position of Fig. 2. In Figures 1, 1A and 4, the direction of rotation 35 of the hose diaper 16 is clockwise (clockwise) and in Figure 2, respectively, counterclockwise. Thus, in the two and more nip presses of the papermaking machine, the same length of hose reel 10 can be used in different long nips, because the direction of rotation of the hose sleeve 16 can be reversed, i.e. the direction of rotation of the hose sleeve 16 can be changed.

5

Figures 5 and 6, which will be described in more detail below, show some particularly advantageous press sections, each of which is provided with two hose reels 10 of the same construction according to the invention.

The structure of the hose reel 10 shown in Figures 1, IA, IB, 2,3 and 4 will now be described in more detail.

Figure 3 is an axonometric view of the structure of the press shoe 11. As stated, it is essential that the clamping shoe 11 is symmetrical about its longitudinal center plane K-K so that the direction of rotation of the hose sheath 16 in the hose reel 10 can be easily changed. The press shoe 11 has an active face 18 pressed against the inner surface of the flexible hose mantle 16, and the hydrostatic chambers 191 ... 19N open to the face face 18. When the loading cylinders of the press shoe 11-. 20 to 12 are supplied with different pressures in the transverse direction of the machine to • MM «| The pressure pressure distribution is adjusted in the transverse direction of the machine. Typically, N · 150 ... 1500 kN / m. • · · Adjustment of the machine's transverse compression pressure is usually max. n. ± 5 ... 15%.

::: 25 of Figure 4, the two loading cylinder series 12 is brought 0in direction of the arrow through the tube bundle 25 different pressures P1 ... PN, which allows nippipainejakautumaa and the cross direction and the machine direction nip A can be adjusted by per se known. The hydro-static chambers 191 ... 19N are introduced via a bundle of tubes 25 and capillary nozzles 17 (FIG. 1B) into a so-called. lubricating oil with a flow rate> · »; · Can be controlled, whereby the flow rate and the compression load of the press shoe determine together the pressure of the oil formed in the static chambers 19 ^, 19N. The pressure P of the oil P in the chambers 19j ... 19N provides a pressure in the area of the static chambers.

35 6 111860

As shown in Figure 4, the upper press roll 20 is mounted on its bearing pins 22a and 22b in the bearing brackets 23a, 23b. The roller 20 is rotated by the actuator 24. The jacket 16 of the hose reel 10 is arranged to rotate about a central axis 15. The central shaft 15 is supported by brackets 27a and 27b, 5, which are supported on a frame part 50. Lubricating and loading oils will be the hose roll 10 from its driving side through the tube bundle 25 and the oils are returned through the operating side by means of a hose 26 for circulation oout.

At the ends and spacings of the chambers 191 ... 19N of the compression shoe 11 there are spacers 10a 19a. The face 18 of the press shoes 11 is symmetrical with respect to plane K-K, starting from the outer edges starting from rounded edge portions having a radius of curvature R3 extending as front and rear edge portions 11a and 11b of substantially greater radius of curvature R4. The parts 11a and 11b having a radius of curvature R4 pivotally position the press shoe 11 between the inner planes of the support members 14. The support members 14 are fixed to a central shaft 15 which is stationary. Positioned by the inner surfaces of the support members 14 and supported by the loading cylinders 12, the face 18 of the press shoe 11 loads the long nip zone EN. The long nip zone EN is formed between the lines A-A comprising its median symmetry plane K-K 20 on both sides inwards including the plane portions A-B of the face surface 18, the portions B-C having a curvature radius R2 and the plane portions C-D. The radius of curvature R2 of the curved portions B-C is R2 = R4 + P + Δ, where Rx is the radius of the counter roll 20, ·, '· P is the thickness of the fabric 22 + hose envelope such as belt 16 and Δ is

1 'dimension Δ = 0.. .5mm. Preferably, the radius of curvature R is R4 * = 0.5 x L, where L

25 (Fig. 3) is the total length of the shoe 11, i.e. the central distance of the parts 11a and 11b in the machine direction. On both sides of the supports 14 of the press shoe 11 are inside the hose mantle 16 the oil drain troughs 13 and the tubes 60. The press shoe 11 scrapes the lubricating oil into the oil drain trough 13 and out of the hose reel 10 via an internal overpressure 30. When the clamping shoe 11 is in the lower position as shown in Fig. 2, the lubricating oil is discharged from the "air reservoir" * ·; raised by the hose reel 10 through the center tube (not shown) out of the hose reel 10.

The preferred design and dimensioning example of the press shoe 11 shown in Figures 1 and 3, and in particular the front face 18 thereof, will now be described.

7, 111860

From point A to point B of Figure 1 of the press shoe 11 is a hydrodynamic region, most preferably parallel to the tangent of radius R2 of part B-C and of length n.

0 ... 25 mm. A short dimension A-B is an advantageous rapid drop for minimizing edge pressure drop and minimizing wetting of web W to be compressed, but dimension A-B must be long enough to form a good layer of lubricating oil. Alternatively, if dimension A-B is zero, the radius R 3 should be relatively large, e.g. about 50-100 mm, to form a sufficiently hydrodynamic wedge. From line B to line C of the face 18 of the press shoe 11 is the radius of curvature R2 of the shoe. The dimension 10 B-C is about 10 ... 50 mm. On the curved regions B-C, hydrodynamic wedges are formed by the load cylinder series 12 forces "F1, F2" when "darting". The nip pressure in the long nip zone EN is achieved by two sets of loading cylinders 12 and by the pressure P supplied to the hydrostatic chambers 191 ... 19n. In the machine direction, two sets (rows) of loading cylinders 12 are placed side by side. The individual cylinders 15 may also be replaced by two machine transverse chambers and movably sealed chamber-shaped piston portions, and a load pressure is applied "below" the piston portions sealed to the chamber walls. Load Loop - ..: by varying the magnitude and relation of the loading forces F1 and F2 of the blades 12. ': The aforesaid "rite", i.e. pressure distributions of the front face 18 of the load shoe 11, can be obtained: · 20 ground in the machine direction.

"111860 19i ... 194 ... (19n) are limited to the circular arc portions R5, R6, R8, R7 and R9, which delimit said bases 19a. The design variant of the hydrostatic chambers 191 to 194 shown in Fig. 1B is advantageous in particular in terms of the duration of the conveyor belt 16.

A preferred dimensioning example of the clamping shoe shown in Fig. 1B is shown below: R 5 = 40 to 200 mm, most preferably 60 to 120 mm R 6 = 5 to 15 mm, most preferably 7 to 10 mm 10 R 7 = 10. .50 mm, most preferably 15 to 30 mm R8 = 5 to 20 mm, most preferably 7 to 15 mm R9 = 5 to 20 mm, most preferably 7 to 15 mm

H1 = 1 ... 10 mm, (height of hydrostatic chamber relative to radius R2), most preferably 3 to 6 mm H2 = 0 ... 2 mm, (height of hydrostatic chamber heels), most preferably 0.1 ... 0 , 5 mm (H2 may also be = H1) L1 = 7 ... 40 mm, (width of hydrostatic chamber stems in the transverse direction of the machine) most preferably 10 ... 25 mm L2 = 50 ... 300 mm, (hydrostatic chamber stems distance 20), most preferably 70 to 200 mm s * · 17 = capillary nozzle through which the pressurized oil is supplied (L! t to hydrostatic chambers 191 to 19 n · · · d = 0.5 to 4 mm (capillary nozzle diameter) ), most preferably 1 ... 3 mm.

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The above dimensioning is also suitable for use in the embodiment 25 of Figures 1, 2 and 3.

IB and 2 show the heels 19a of the hydrostatic chambers 19i ... l94. · «*, Alternatively can also be completely removed, whereby the hydrostatic chamber is uniform · ·,;, uniform across the shoe, i.e. H2 = H1. However, the ends 11 of the press-fit shoe 30 have hydrostatic chamber limiting walls shown in Figure 3. However, in this embodiment, capillary nozzles 17 are used which distribute the pressure lubricating oil fairly evenly along the width of the machine, especially when the dimension H1 is small, i.e. H1 «1 ... 3 mm, although the leakage of hydrostatic chambers 191-19 due to differences in compression pressure 5.

The correct design or possible removal of the hydrostatic chambers 19i ... 19n and their partitions 19a is particularly advantageous in terms of the duration of the belt 16. The sharp bends of the belt 16 caused by the "paper molds" are reduced and the pressure peaks 10 are reduced. Also, the worse local lubrication situations caused by the partition walls 19a of the press shoe 11 and the resulting higher temperature strips on the belt 16 can be reduced or eliminated.

In Fig. 4, upper roll 20 is a counter roll of a long nip press roll 10, which may be e.g.

15 rigid so-called. a tubular roller or a deflection compensated roller with a static shaft and slides. The counter roll 20 is provided with a drive 24 having an electric motor and a gear gear located on the drive side of the machine. The lower roll is a hose reel 10 according to the invention with a hose diaper 16 which is not actuated. The upper roll 20 and the lower hose roll 10 are connected to one another by means of high-load carrying and openable bonding devices 27c and 27d from their bearing housings 23a, 27a and 23b, 27b.

. Into the long nip roll 10 is supplied the pressure oil of the loading cylinders 12 of the night shoe 11 and the high pressure lubricating oil of the static chambers 19i ... 19n of the shoe 11: ·. most preferably from the machine side. These pressurized oil pipes, pressure and temperature measurement lines, and longitudinal nip roller air pressure import lines are generally; V. 25 machine widths, grouping of load cylinders 12 and inner nip roll 10; '' '; depending on these measurements, a total of about 5 ... 40 pcs. They are advantageously placed in the machine * · ·; '· (On the drive side so that they do not have to be removed while belt belt 16 or press fabrics 22 are replaced, the oil fed into hose reel 10 is generally removed from the treatment side # ·

III

by means of one or two large tubes or tubes 26. During the replacement of press felts 22 and belt * i * *, 30, flange connection 26a »» »: of the aforesaid drain oil hose or pipe 26 is opened to remove the pipes from the machine pushing path.

10 111860

Referring now to Figures 5 and 6, two particularly advantageous press section geometries, in which the long nip roll, or hose roll 10, of the invention is applied, will first be described. The paper web W is detached from the forming fabric 30 at the pickup point P and is moved by the suction zone 30a of the pickup roll on the underside of the first press felt and pick up felt 31 to the first nip N1 in Figure 5 and the long nip EN1. In Fig. 5, the first roll nip N1 is formed between an upper press suction roll 29 and a hollow lower press roll 28. The web W and the top felt 31 pass through the suction zone 29a of the suction roll roll 29 through the second roll nip N2. The second nip N2 is formed between a press suction roll 29 and a smooth-faced 21 roll roll 20. In Figure 5, the first roll nip N1 is dual felt including bottom felt 32. The second nip N2 is single felt and passes through only the top felt 31. The web W engages the surface of the smooth surface 21 roll 20 and the web W is inserted into the first .

Fig. 5 shows another separate long nip EN2 having a lower felt 34. The web W is released. is provided as a short free draft WP from the surface 21 of the center roll 20 and guided by the guide roller through the suction zone 37a of the transfer suction roll 37 to the water receiving lower 20 felt passing through the second longitudinal nip EN2. The long nip EN2 has a press roll 20 having a smooth surface 21, from which the web W is guided in a short free pass, guided by a guide roll WP, onto a drying wire 40 and further over a multicylinder dryer 42 and turning suction cylinders 43.

In the press section alternative shown in Fig. 5, the press nipple 11 of the third nip of the press EN 1: * ": the hose reel 10 of the invention is in the lower position. The press section is:. ·. Provided with a separate fourth long nip press EN2 The smooth roller press roller 21 and the lower roller are hose rollers 10 according to the invention, which are wrapped around by a press felt loop 34. The presser shoe 11 of the fourth press EN2 according to the invention is in the upper position.

n 1Ί1860

As shown in Figure 6, the two long nipples EN1 and EN2 are provided with two felts 31.32 / 33.34. The first long-nip EN1 upper roll is a press roll 20 with an on-surface 2Γ and a lower roll long nip roll 10 according to the invention. 33 which introduces web W into another long nip EN2. The second long nip EN2 has a hose reel 10 according to the invention as a top roll having a direction of rotation opposite the hose reel 10 of the first long nip EN1. Thus, the clamp component alternative shown in Fig. 6 has two separate handed 10 long nipples EN1 and EN2. The first long-nip EN1 hose reel 10 is in the lower position (clamping shoe 11 in the upper position of the hose reel 10) and the second long-nip EN2 hose reel 10 in the upper position (clamping shoe 11 in the lower position of the hose reel 10).

The reason for the varied positioning of the hose reels 10 in the longitudinal nipples EN1 and 15 EN2 is due to the felt geometry of the press section which takes into account the most advantageous displacements of web W by transfer suction rolls 35,36,37 from one press felt that, for example, the press felt does not press the belt nipple 16 of the long nip press EN1, EN2 against the inlet and outlet edges of the press shoe 11, resulting in sharp bending of the belt nozzle 16 and a reduction in life. Also, the various positioning of the hose reels 10 according to the invention can influence the symmetry of the paper, especially if smooth belt diapers of a long nip press are used. ·, 16 and 2inta counter rolls on the surface 20.

The following are claims in which, within the scope of the inventive concept '25, various details of the invention may vary and depart from the above; '': Only as an example.

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Claims (11)

A long nip press roller (10) in a paper machine comprising a stationary center shaft (15), a loading shoe (11) and hydraulic loading elements (12) between said stationary shaft (15) and loading shoe (11), with which an active front surface (18) of the loading shoe (11) is pressed against the inner surface of a flexible hose sheath (16) of the long nip press roll (10) to provide compression pressure in a long nip zone (ΕΝ / ΕΝ- its counter roll (20), characterized in that the loading shoe (11), the loading arrangement of the loading shoe and the oil drainage arrangement of the loading shoe, which comprises on both sides of the loading shoe (11) within the loop (16) of the non-draining grooves (13) and to these connected non-discharge pipes (60), are substantially symmetrical with respect to an axial central plane (KK) of the longitudinal nip roll (10) in such a way that the direction of rotation of the hose sheath (16) may be any about the heist and the one assuming the position of the long nip press roller (10). 2. A long nip press roll according to claim 1, characterized in that the loading shoe (11) in the long nip press roll is symmetrical with respect to the central plane (KK) of a front surface area (AA) forming the long nip zone, which plane (KK) extends through the center axis of:; : the counter roll (20) in the longitudinal nip zone or near it. 3. A long nip press roll according to claim 1, characterized in that the long nip press roll (10) has symmetrically on the bed, sides of its axially directed central plane (KK) at the outer edges, areas with a large radius of curvature (R4), which support each other. between support portions (14) attached in connection with the center shaft (15) of the longitudinal press roll (10), so that after the side portions (11a, lib) with said curvature radius (R4) follow edge-ft portions with smaller radius of curvature (R3) ), the elongation of which consists of flat ·; ·· parts (AB) forming a hydraulic wedge and after these parts having a slightly larger radius of curvature (R2) than the radius of curvature (R1) of the counter roll (t) • (20), which continue as pipe or leg portions to the center line of the on 35 load shoe (11), wherein symmetrically on both sides of this line 17 lies a series of hydraulic load chambers (191 ... 19N) to which load oil (0) can be passed through capillaries (17 ). 4. A long nip press roller according to any of claims 1-3, characterized in that the front surface (18) of the loading shoe (11) of the long nip press (10) has a series of hydrostatic load pressure chambers (19). 19, to which pressure chambers (191 ... 19N) can be fed a pressure medium of adjustable pressure (P), most preferably lubricating and loading oil a. 5. Press section in a paper machine, comprising at least two long nip (EN1, EN2), characterized in that the long nip (EN1, EN2) in the press section has a long nip press roll (10) according to any of claims 1-4 in positions with one another different direction of rotation and which longitudinal nip roll (10) together with its counter roll (20) forms long nip zones (EN1, EN2) through which the paper web (W) is guided (Figures 5 and 6). 6. Press section in a paper machine according to claim 5, characterized in that the press section has a first nip with double felt (31,32) a roll nip (N1), the upper felt (31) being a pick-up. -: blanket which also runs through a second roll nip (N2) in the press section, which; ; ; is formed between a press roll (29) common to the above-mentioned press nip (N1, N2) and a smooth surface (21) middle roll (20), that a first longitudinal nip (20) is formed in conjunction with said smooth surface (21) EN1) in the press section, in which a longitudinal nip press (10) according to any of claims 1-5 is upper roll and said middle roll (20) lower roll and through which longitudinal nip (EN1) is led a water receiving upper press blanket (33) and to the press portion additionally belong to a second separated longitudinal type t> 30 (ΞΝ2), the lower roll of which is a longitudinal press roll (10) according to any of the claims · 1 to 1 and upper roll a press roll (20) (Figure 5). »· # 1 1, 1 ·, 7. Press section in a paper machine according to claim 6, characterized in that the web (W) is released from the smooth surface (21) of the middle roller (20) after the first longitudinal nip (EN1). and is transferred to the upper surface of a lower tissue (34) by the second longitudinal nip zone (EN2), from which the web (W) after the second long nip zone (EN2) is released on the surface of the upper smooth surface (21). 20) in this and is further passed on to it and most conveniently in a short free pull (WP) further to a drying wire (40) in a first drying cylinder group of a drying portion following the pressing portion 5 (Figure 5). 8. Press section in a paper machine according to claim 7, characterized in that the press section has two consecutive long nip zones (EN1, EN2), through which the web (W) is guided in the final draw 10 (Figure 6). 9. Press section in a paper machine according to claim 8, characterized in that both the longitudinal nip zones (EN1, EN2) are provided with two water-absorbing transfer tissues and press tissues or with this and a transfer belt such that the web (W) has a closed pull at the transfer. to the drying wire (40) after the aforementioned long-nip zones (EN1, EN2) and the press section (Figure 6). 10. Press section of a paper machine according to claim 9, characterized in that the upper press tissue of the first longitudinal nip (EN1) of the press section is a pick-up tissue (31), with which the web (W) is released at a pick. up position (P) from a forming wire (30), that. ; The web (W) after the first longitudinal nip zone (EN1) follows, most preferably with the aid of suction roll transfer (35,35a), with a lower press tissue (32) in the first longitudinal nip zone (EN1), with which the web (W) is conveyed to one, ·, upper press tissue (33) of the second longitudinal zone (EN2) by means of suction roll transfer (36,36a) and that the web (W) after the second longitudinal zone (EN2) is arranged to follow a lower tissue (34) or a transfer belt of the second longitudinal nip zone (EN2), with which the web (W) '' is finally pulled to the drying wire (40) in the first drying cylinder in the group of the drying portion following the press section with the aid of ..... a transfer suction zone (41a) on a transfer suction roll (41). »I 11. Press section in a paper machine according to claim 10, characterized in that the first longitudinal nip zone (EN1) has as a lower press roll a long nip press roll (10) according to any of claims 1-5 19 111860 and which an upper press roll is provided with a grooved surface (21 ') and the second long nip zone (EN2) has as a top press roll a long nip press (10) according to any of claims 1-5 and as a lower press roll with a grooved surface ( 21 ') provided press roll (20) (Figure 6). 5> · t * »•« I 1 · · «· • * *» * * · ·