WO2007003504A1

WO2007003504A1 - Method for the production of a paper web, especially rotogravure paper

Info

Publication number: WO2007003504A1
Application number: PCT/EP2006/063332
Authority: WO
Inventors: Ulrich Begemann
Original assignee: Voith Patent Gmbh
Priority date: 2005-07-01
Filing date: 2006-06-20
Publication date: 2007-01-11
Also published as: CN101213340A; EP1910613A1; DE102005031202A1; JP2008545068A; US20080236776A1

Abstract

The invention relates to a method for producing a paper web or another fibrous web. According to said method, the fibrous web is impinged upon by pressure in the penultimate press nip and then in a last press nip of a press section. One face of the fibrous web is in contact with a smooth surface when penetrating the penultimate press nip while the other face of the fibrous web is in contact with a smooth surface the when penetrating the last press nip.

Description

Process for producing a paper web, in particular gravure paper

The invention relates to a method for producing a paper or another fibrous web according to the preamble of patent claim 1.

As high-speed paper machines, the following configurations are currently used for the production of high-quality SC paper (SC = super calendered): what are known as roll-blade shapers, i. H. Screen former with a forming roller and drainage strips, without flexible strips in conjunction with a downstream conventional press section built with three press nips. The press nips can also be formed by shoe press rolls. Subsequently, a free-standing press unit is preferably arranged for a fourth press nip. Outside the paper machine, the fibrous web is smoothed by at least two offline multi-nip calenders which follow the paper machine production at a lower calendering speed.

To set the required inlet moisture and the most uniform possible moisture distribution over the entire width of the web, the fibrous web is usually dried in the dryer section to a residual moisture content of 2 to 3% and moistened before the reeling station still within the paper machine with the help of a Wasserauftragsaggregates, such as a Düsenfeuchters. The residence time of the wound with the paper web of the after winding in the paper machine to the calendering of the paper web in the calenders is between 0.5 and 2 hours. Thanks to the drying out and the long dwell time, a very good moisture distribution in all directions within the paper web can be assumed.

The integration of the multinip calender in the paper machine (online process) generally results in a significant speed increase of the calendering process. Due to the shorter residence time in the nip and due to other web running conditions, the online process has cost advantages compared to the classic offline process described above; At the same time, however, it leads to quality disadvantages, which manifest themselves in particular in the printability in the gravure printing process in the form of print unrest and a higher number of missing dots (missing dots).

Such on-line processes are carried out in the following manner: A roll-blade former with or without flexible twin-mesh bars is used in conjunction with two freestanding shoe presses or a freestanding roller press and a subsequent shoe press in conjunction with a multi-pin calender.

Alternatively, a roll-blade former with or without flexible strips in the twin-wire area and a conventional three-nip press with or without Schuhnip used in conjunction with a multi-pin calender.

Or a roll-blade former without flexible strips in the twin-wire area and a conventional three-nip press with or without Schuhnip and a freestanding fourth press in conjunction with a multi-pin calender used.

Compared to an offline process, the productivity in an online process can be significantly higher due to the loss of rewinding losses caused by winding, unwinding and rewinding the paper web after calendering.

A conventional press section, which is designed as a three-nip press without an additional free-standing fourth press, generally shows a very strong

Structural two-sidedness of the paper due to asymmetric

Dewatering conditions in the press, as in the second and third press nip the Drainage is done only to the top. When operating a shoe tip in the third position, the dry content may indeed be increased significantly, which generally leads to a higher speed and consequently also to a higher productivity. However, the heavier dewatering to the top further increases paper two-sidedness.

The press configurations with two free-standing press nips are either fourfold felted or have an impermeable transfer belt in the second lower position. As a result, a supported web run is possible with little trains. In the quadruple felted configuration, this results in increased roughness of the base paper. When configured with the transfer belt in the second lower position, the base paper has increased two-sidedness.

It is the object of the invention to propose a process for the production of a fibrous web, in particular high-quality SC papers, in which with regard to the runnability, d. H. run time and material efficiency, and product quality, paper surface roughness, and missing dots improve results.

According to the invention, this object is achieved by a method for producing a paper or another fibrous web, in which the fibrous web is subjected to pressure in a press section at several press nips, wherein one side of the fibrous web in contact with a smooth surface through the penultimate press nip of the press section is guided and wherein the one side opposite side of the fibrous web is guided in contact with a smooth surface through the last press nip of the press section.

According to the invention, the fibrous web is thus smoothed on both sides at low dry contents in the two last press nips of the press section, since each side of the fibrous web is guided with a smooth side into contact through a press nip becomes. Thus, in the last two press nips a two-sided macro-smoothing of the surface of the fibrous web, which leads to a significantly improved calendering in the subsequent calender.

Experiments by the Applicant have shown that due to the two-sided wet smoothing according to the invention in the press section, the calendering line forces required for a given PPS roughness after calendering can be lower by up to 100 kN / m.

This results in a significantly improved end product quality, since negative effects of the calendering, such as, for example, black satalay or decrease in volume, can be significantly reduced by the reduction of the calendering line forces.

The smooth surface with which the fibrous web is brought into contact when passing through a press nip can be formed both by a roll cover with a smooth cover or by a smooth transfer belt.

If it is a transfer belt with which the fibrous web is brought into contact with the press nip, this may be permeable or impermeable depending on the application.

A preferred embodiment of the invention provides that the press section comprises a three-nip press with a central roll and a free-standing press with a single nip, wherein the third nip of the three-nip press is the penultimate press nip of the press section and wherein the Einzelnip the freestanding Press is the last press nip of the press section.

A further embodiment of the invention provides that the fibrous web is passed together with a transfer belt through the second and third press nips of the three-nip press formed between the central roll and the press rolls. In a further embodiment of the invention it is provided that the one side of the fibrous web is guided in contact with the transfer belt and the other side of the fibrous web in contact with a press felt through the penultimate press nip. Thus, dewatering takes place in the direction of the press felt, whereas the fibrous web is smoothed by contact with the smooth transfer ribbon in the wet state.

If the press, as described above, for example, formed by a three-nip press with central roll and downstream freestanding press with a single nip, so preferably one side of the fibrous web in contact with the lateral surface of the central roll and the other side of the fibrous web in Contact with a press felt passed through the third press nip of the three-nip press forming the penultimate press nip of the press.

Further, preferably, one side of the fibrous web in contact with a press felt and the other side of the fibrous web in contact with the shell surface of the press roll pass through the last press nip, which can be formed by the single press nip of the free-standing press.

In order to be able to achieve higher production speeds, it is necessary to increase the dry content after the press section, in order thus to avoid, for example, overstretching and tearing off of the fibrous web due to web tension. By forming the penultimate press nip and / or the last press nip as a shoe press nip, the dry content of the fibrous web can be increased. For example, by using a shoe press in the penultimate press nip, the dry content is increased by 4%. Furthermore, the smoother effect is enhanced by the longer residence time of the fibrous web in the shoe press nip compared to conventional press nips.

If the fibrous web is guided, for example, on the transfer belt through the three-nip press and then through the single press nip of the freestanding press, it makes sense if the fibrous web by a transfer suction of the Transfer belt is transferred to the press felt on which this happens the only press nip the freestanding press.

If, for example, in a subsequent step, smoothing of the fibrous web in an on-line process (on-line calendering) is to be carried out, then because of the higher calendering speeds compared with the offline process, this places very high demands on the cross-sectional quality of area-related mass and moisture. Accordingly, a preferred embodiment of the method according to the invention provides that, in order to correct the moisture transverse profile of the fibrous web at a moisture content of less than 50%, preferably after the press section, at least once in the cross-machine direction a fountain solution is applied to the fibrous web.

Furthermore, it may be useful to selectively apply at least once a dampening solution to correct the moisture profile in the forming section and / or in the press section on the fibrous web in the cross machine direction.

Preferably, the fibrous web is formed in a vertical gap former, in particular twin-wire former.

The gap former has flexible formation strips. As a result, the formation and the pressure balance in half and full tones is improved. Experiments have shown that by using flexible formation strips in a drainage range between 2% and 8% dry content, preferably between 3% and 6% dry content, the formation index according to Ambertec can be significantly reduced.

Experiments showed an average formation improvement of 20% as well as an improvement of moping of 10%. In the case of the formation with flexible formation strips, in comparison with the formation without formation strips, a fiber with a significantly lower freeness can be used to obtain a fibrous web with the same quality properties become. Due to the lower degree of grinding, the required specific grinding energy is significantly reduced. Assuming that the specific grinding energy, the Mahlgard and the formation / pressure rest are linearly linked together, this results in an energy cost advantage of up to 20% in the area of pulp processing.

It has been found that the best results with regard to the abovementioned properties are achieved if preferably 1 to 10 flexible formation strips, more preferably 3 to 5 flexible formation strips, are used.

Furthermore, the formation strips are advantageously pressed against the sandwich, consisting of the two forming fabrics with interposed fibrous web, with a contact pressure in the range between 5kPA and 3OkPa, preferably between 8kPa and 25kPa.

Furthermore, the flexible formation strips cause additional drainage in the twin-wire area.

For optimum drainage, the wrap angle of the forming roll through the two forming fabrics is between 30 ° and 60 °, preferably between 40 ° and 55 °. Thus, it is possible to achieve dry contents of 18% to 20% at the end of the forming section, even at speeds of up to 2000 m / min.

With increasing speed of the fibrous web, the properties of the forming fabrics used for the dewatering regime and the structure of the paper surface play an increasingly important role.

Here, the forming fabrics used should ensure a sufficiently high dewatering rate, a low

Have water storage volume and a fine paper-side surface exhibit. Forming fabrics with a sieve thickness of less than 0.7 mm, preferably less than 0.65 mm and with a number of fiber support points of more than 1400 / cm ² , preferably more than 1500 / cm ² , more preferably more than 1600 / cm ² are for this purpose particularly suitable.

After the press section, the fibrous web passes through a drying section and is dried in this. There are different ways to dry the fibrous web, for example by drying on heated cylinders or by Impallströmtrocknung with hot air.

In another variant of the invention, the press section consists only of three press nips and is additionally arranged between the press section and the actual dryer section an impingement drying device, also called impingement drying device. Even with this arrangement, good results, in particular good runability and good gravure printability can be achieved. In particular, by this arrangement, the two-sidedness of the paper web can be significantly reduced.

Preferably, the three press nips are formed by a three-nip press with a central roll and two press rolls. This results in a compact construction and therefore has advantages in terms of space requirements and production costs.

The first and / or the third press nip can in this variant be designed in each case as a roller press or as a shoe press. With shoe presses, the drying performance can be increased.

A preferred embodiment of the impingement drying device or impingement device consists in a high dryer, which in particular comprises two drying cylinders and impingement hoods. It is preferred if the drying cylinders are slightly sucked. For the suction advantageously stabilizers can be used. The drying cylinders of the impingement drying device preferably have one Diameter of 3 feet or more.

After drying the fibrous web in the dryer section, this is, if it is, for example, rotogravure paper, fed to a multinip calendering device. The multi-pin calendering device can have between 6 and 12 rollers.

To increase the productivity, it makes sense if the multinip calendering device is an on-line calendering device, since, for example, offline calenders permit significantly lower web speeds and a repeated rewinding of the paper web is necessary.

Especially for Offestdruck- applications has been found, for example, in experiments with fibers with a high fines content that over-drying of the fibrous web and subsequent humidifying between dryer section and online Multinip -Kalander is advantageous, whereby disturbances in dimensional stability such as cockling and fluting significantly reduced or be prevented. A preferred embodiment of the method according to the invention therefore provides that the moisture content of the fibrous web when leaving the dryer section is below the equilibrium moisture content at standard conditions. A further preferred embodiment of the method according to the invention further provides that the fibrous web is preferably wetted selectively in the cross machine direction before entering the calendering device. By selective moistening in the cross-machine direction, moisture transverse profile fluctuations can be compensated.

To produce a same two-sided paper surface, a same treatment on both sides of the paper web is advantageous. A preferred embodiment of the invention therefore provides that one of the two sides of the fibrous web is brought into contact in each case with a heated roller in a first sequence of Kalandemips and that the other of the two sides of the fibrous web in a second sequence of Kalandemips each is brought into contact with a heated roller.

In order to achieve the same smoothness on both sides, it makes sense if the fibrous web is moistened on both sides after leaving the dryer section.

It is possible that before each sequence of Kalandernips each side of the fibrous web is moistened, which is brought into contact with the heated rollers.

On the other hand, another embodiment provides that the fibrous web is moistened on both sides prior to entry into the calendering device.

Furthermore, it is possible to provide additional humidifying devices between the above-mentioned locations in order to apply the required amount of moisture to the fibrous web.

Best smoothness of the calendered fibrous web is achieved when the fibrous web is moistened to a moisture content of 7% to 9%, preferably to a moisture content of 8%.

It makes sense here if the fibrous web has a moisture content of 7% to 9%, preferably 8%, before each sequence of calender nips.

Preferably, the fibrous web is moistened by means of steam humidifier and / or nozzle moistener.

Due to the very short residence time between dampening solution application and first Kalandemip the droplets must be finely distributed for a sufficient humidification of the fibrous web. This can be achieved by a two-fluid humidifier with air and dampening solution.

The method described above with its various inventive Embodiments are preferably used for the production of intaglio paper or SC or SCA + paper, which preferably has a filler content of 25% or more, more preferably a filler content of 30% or more.

The invention will be explained in more detail below with reference to two exemplary embodiments. Show it:

Figure 1 is a schematic view of a paper machine for carrying out the method according to the invention, and

FIG. 2 shows a variant of FIG. 1.

FIG. 1 shows a paper machine 1 for producing SC paper, which preferably has a filler content of 25% or more.

In the production of a fibrous web 2, this successively passes through the following sections of the paper machine 1. Forming section 3, press section 4, dryer section 5 and calendering device 6 before it is wound in a winding device, not shown.

The fibrous web 2 is formed in the formed as a vertical gap former Formierpartie 3 in a stock inlet gap 7 between an upper Formiersieb 11 and a lower Formierieb 10. After the fabric inlet gap 7 wrap around the sandwich consisting of upper forming fabric 11, fibrous web 2 and lower forming fabric 10 for dewatering the fibrous web 2 a forming roller 8 in the angular range between 30 ° and 60 °, preferably between 40 ° and 55 °.

Subsequently, the fibrous web 2 is further dehydrated in a drainage range between 2% and 8% dry content, preferably between 3% and 6% dry content by means of three flexible formation strips 12. The flexible one Formation strips 12 are in this case pressed with a contact pressure in the range between 8 kPa and 25 kPa against the sandwich consisting of upper forming fabric 11, fibrous web 2 and lower forming fabric 10.

As a result, the formation and the pressure balance in half and full tones is improved. Experiments have shown that the use of flexible formation strips significantly reduces the formation index according to Ambertec. In addition, a formation improvement of 20% on average and an improvement of mottling of 10% are observed. In the formation with flexible formation strips can be compared to the formation without formation strips a pulp with a significantly lower freeness used to obtain a fibrous web with the same quality properties. Due to the lower degree of grinding, the required specific grinding energy is significantly reduced. Assuming that the specific grinding energy, the Mahlgard and the formation / pressure rest are linearly linked together, this results in an energy cost advantage of up to 20% in the area of pulp processing.

The fibrous web has an upper side 27 and a lower side 28 arranged opposite the upper side 27.

Subsequently, the sandwich consisting of upper Formierieb 11, fibrous web 2 and lower Formierieb 10 is passed over a Siebsaugwalze 13 before the upper Formiersieb 11 is lifted from the upper side 27 of the fibrous web 2 and this with the lower side 28 on the lower Formierieb 10 for Press section 4 is performed.

Due to the configuration of the forming section 3 described above, optimal dewatering of the fibrous web 2 takes place, so that it is possible to achieve dry contents of the fibrous web 2 of 18% to 20% at the end of the forming section 3, even at speeds of up to 2000 m / min. In order to ensure a sufficiently high dewatering speed combined with a small water storage volume and a fine paper-side surface, the upper forming mesh 11 and the lower forming mesh 10 have a mesh thickness smaller than 0.7 mm and have a number of fiber support sites of more than 1500 / cm ² .

The fibrous web 2 is transferred at the end of the forming section 2 via a pick-up roller 24 from the lower forming fabric 10 to a press felt 20 of the press section 4.

By means of the press felt 20, the fibrous web 2 is guided on its upper side 27 to a first press nip 14 of a three-nip press 13 and guided in a sandwich between the press felt 20 and a press felt 19 through the first press nip 14.

The three-nip press 13 has a central roller 21 which forms a second press nip 15 with a roller 25 and a third press nip 16 with a roller 26.

When passing through the second press nip 15, the upper side 27 of the fibrous web 2 in contact with the press felt 20 and the lower side 28 of the fibrous web 2 in contact with the smooth circumferential surface of the central roll 21st

When passing through the third press nip 16, the upper side 27 of the fibrous web 2 is in contact with a press felt 22 and the lower side 28 of the fibrous web 2 in contact with the smooth surface of the central roller 21. The third press nip 16 is the penultimate press nip of the press section represents.

Subsequently, the fibrous web 2 passes through the single press nip 17 of a free-standing press 18. The press nip 17 forms the last press nip of the press section 4.

When passing through the press nip 17, the upper side 27 of the fibrous web 2 is in contact with the smooth lateral surface of a press roll 29 and the lower side 28 the fibrous web 2 in contact with a press felt 23rd

Thus, the fibrous web 2 at a low dry content in the last two press nips 16, 17 of the press section 4 is successively smoothed on both sides 27, 28, since each side 27, 28 of the fibrous web 2 with a smooth side in contact by one of the press nips 16, 17 is led. Thus, in the two last press nips 16, 17, a two-sided macro-smoothing of the surface of the fibrous web 2, which leads to a significantly improved calenderability in the subsequent calender.

In order to be able to achieve higher production speeds, it is necessary to increase the dry content after the press section, in order thus to avoid, for example, overstretching and tearing off of the fibrous web due to web tension. Therefore, optionally, the penultimate press nip 16 and / or the last press nip 17 could be formed as a shoe press nip. Furthermore, the longer dwell time of the fibrous web 2 in the shoe press nip would increase the smoothness effect compared to conventional press nips.

Due to the to be performed in a subsequent step smoothing of the fibrous web 2 in an online process (online calendering) to be

Fibrous web 2 because of the higher Satiniergeschwindigkeiten over the

Offline process placed very high demands on the cross-sectional quality of area-related mass and moisture. Accordingly, to correct the moisture profile of the fibrous web 2 at a moisture content of less than 50% after the press section 4 in the cross machine direction selectively at least once a dampening solution are applied to the fibrous web 2.

After the press section 4, the fibrous web 2 is transferred to the dryer section 5, which in the present embodiment has a plurality of single-row arranged drying cylinder 30 and is not fully shown in its length. After drying the fibrous web 2 in the dryer section 5, this is fed to an online multi-pin calendering device 6.

When leaving the dryer section 5, the fibrous web has a moisture content that is below the equilibrium moisture content at standard climate. The fibrous web 2 has a moisture content of about 2.5%. Before entering the calendering device 6, the fibrous web 2 is selectively moistened in the cross machine direction, so that the fibrous web 2 has a uniform moisture content of about 8% over the web width.

The moistening takes place on the lower side 28 of the fibrous web 2 by means of a nozzle moistener 35, which is designed as a two-component nozzle moistener, from which an air-dampening solution mixture emerges.

The above-described process step of overdrying the fibrous web 2 with subsequent rewet before entering the multinip calender 6 has been found to be advantageous, especially in experiments with fibrous materials with a high fines content, as this significantly reduces or prevents disturbances in dimensional stability such as cockling and fluting become. By selective moistening in the cross machine direction can

Moisture transverse profile fluctuations are compensated.

The on-line multi-pin calender 6 has six elastic rollers 31 and four heating rollers 32, which form eight calender nips 33 and one calender nip 34.

By the calendering device 6 is a same two-sided treatment of the fibrous web 2 takes place. This is achieved by first bringing the lower side 28 of the fibrous web 2 in contact with one of the heating rollers 32 in a first sequence 37 of four calendering nips 33 and subsequently, after passing through the calendering nip 34, which is also referred to as an alternating nip, the upper side 27 of the fibrous web 2 is brought into contact with one of the heating rollers 32 in a second sequence 38 of four calendering nips 33. After leaving the first sequence 37 of Kalandemips 33 and before entering the second sequence 38 on Kalandemips 38, the upper side 27 of the fibrous web 2 by means of a Düsenfeuchters 36, which is designed as Zweistoffdüsenbefeuchter moistened. After this moistening, the fibrous web 2 has a moisture content of about 8%.

Furthermore, steam humidifiers 39 to 41 are provided in order to apply the required amount of moisture to the fibrous web 2.

The variant shown in FIG. 2 corresponds to a large extent to the variant of FIG. However, there is no freestanding press 18 here. Instead, after the three-nip press 13, an impingement drying device or impingement drying device 42 is provided. This comprises a first vacuumed drying cylinder 43 and a second vacuumed drying cylinder 44 disposed opposite thereto. Furthermore, the impingement drying device 42 has a clothing 55 which wraps around the first drying cylinder 43 in sections and a clothing 56 which wraps around the second drying cylinder 44 in sections. In the impingement-drying device 42, the fibrous web 2 is not guided between the clothing cylinders 55 and 56 wrapping around the drying cylinders 43 and 44 so that the fibrous web 2 is not pressed against the drying cylinders 43 and 44 by them, which results in web guiding problems can. By the suction of the two drying cylinders 43 and 44, the guidance of the fibrous web 2 is improved by the impingement drying device 42. The two fabrics 55 and 56 are each formed as a sieve. The first drying cylinder 43 is provided with an overhead hot air hood 45, the second drying cylinder 44 is provided with two underlying hot air hoods 46, each of which hot air is directed directly to the fibrous web 2 and which, in contrast to the TAD principle, not by the Fiber web 2 occurs, but is reflected back from the fibrous web 2. This will increase the dry performance considerably increased. Accordingly, in the impingement drying device 42, the hot air is directed by the hot air hoods 45 and 46 directly onto the fibrous web 2 without any stringing therebetween.

The central roller 21 is looped by a transfer belt 47, which is guided with the paper web 2 through the second and the third press nip 15, 16. From the transfer belt 47, the fibrous web 2 is removed by means of a suction roll 48 and transferred to the first drying cylinder 43. The suction roll 48 is looped by a felt belt 49, which is also guided over three web guide rollers 50.

From the first drying cylinder 43, the fibrous web 2 is transferred directly to the second drying cylinder 44. From this, the fibrous web 2 passes through a roller 51 and a suction roller 52 in the drying section 5. The suction roller 52 is thereby looped by the dryer felt 53 of the dryer section 5. Of the drying section 5, only the first two drying cylinders 30 are shown.

Finally, the two drying cylinders 43 and 44 are each sucked by stabilizers 54 which are arranged outside the two drying cylinders 43, 44 on the side facing away from the impingement hoods 45, 46. The stabilizers 54 are located in each case within the loops formed by the wires 55, 56, which loop around the first drying cylinder 43 and the second drying cylinder 44 of the impingement drying device 42 in sections. In addition, each web guide rollers 57, 58 are provided for the loops.

Claims

claims

1. A process for producing a paper or another fibrous web, wherein the fibrous web is subjected to pressure in a penultimate press nip and then in a last Presnip a press section, characterized in that one side of the fibrous web in passing through the penultimate press nip in contact with a smooth surface and that the other side of the fibrous web is in contact with a smooth surface when passing through the last press nip.

2. The method according to claim 1, characterized in that the smooth surface is formed by a roll shell with a smooth cover and / or by a smooth transfer belt.

3. The method according to claim 2, characterized in that the transfer belt is permeable or impermeable.

4. The method according to any one of claims 1 to 3, characterized in that the press section comprises a three-nip press with a central roller and a free-standing press with a single nip, wherein the third nip of

Three-nip press is the penultimate press nip of the press section and where the Einzelnip the freestanding press is the last press nip the press section.

5. The method according to claim 4, characterized in that the fibrous web is passed together with a transfer belt through the second and third press nips of the three-nip press formed between the central roll and press rolls.

6. The method according to any one of claims 2 to 5, characterized in that the one side of the fibrous web is guided in contact with the transfer belt and the other side of the fibrous web in contact with a press felt through the penultimate press nip.

7. The method according to any one of claims 2 to 5, characterized in that the one side of the fibrous web in contact with the lateral surface of a

Roller, in particular the central roller, and the other side of the fibrous web is guided in contact with a press felt through the penultimate press nip.

8. The method according to any one of claims 1 to 7, characterized in that the one side of the fibrous web in contact with a press felt and the other side of the fibrous web in contact with the lateral surface of a

Press roll is guided by the last press nip.

9. The method according to any one of claims 1 to 8, characterized in that the penultimate press nip and / or the last press nip is designed as a shoe press nip.

10. The method according to any one of claims 1 to 9, characterized in that the fibrous web is guided in the press section by four press nips.

11. The method according to any one of claims 2 to 10, characterized in that the fibrous web is transferred by a transfer suction roll from the transfer belt to the press felt of the last press nip.

12. The method according to claim 11, characterized in that the transfer suction roll has a rubberized mantle surface and / or a drilling pattern in the mantle surface.

13. The method according to any one of claims 11 to 12, characterized in that the transfer suction roll is adjustable in its immersion depth relative to the transfer belt and the fibrous web.

14. The method according to any one of claims 1 to 13, characterized in that for correcting the moisture profile at a moisture content of the fibrous web of less than 50%, preferably after the press section, in the cross machine direction selectively at least once a dampening solution on the

Fibrous web is applied.

15. The method according to any one of claims 1 to 14, characterized in that for correcting the moisture profile in the Formierpartie and / or in the

Pressing the fiber web in the cross machine direction selectively at least once a fountain solution is applied.

16. The method according to any one of claims 1 to 15, characterized in that the fibrous web is formed in a Gapformer, in particular Doppelsiebformer.

17. The method according to claim 16, characterized in that the gap former has flexible formation strips, preferably 1 to 10 formation strips, particularly preferably 3 to 5 formation strips.

18. The method according to claim 16 or 17, characterized in that the gap former is a vertical gap former.

19. The method according to any one of claims 16 to 18, characterized in that the wrap angle of the forming roller through the two Formiersiebe in the range of 30 ° to 60 °, preferably from 40 ° to 55 °.

20. The method according to any one of claims 17 to 19, characterized in that the formation strips against the sandwich consisting of the two forming fabrics with interposed fibrous web is pressed with a contact pressure in the range between 5kPA and 3OkPa, preferably between 8kPa and 25kPa.

21. The method according to any one of claims 16 to 20, characterized in that forming fabrics are used with a sieve thickness of less than 0.7 mm, preferably less than 0.65 mm and with a number of

Fiber support sites greater than 1400 / cm ² , preferably greater than 1500 / cm ² , more preferably greater than 1600 / cm ² .

22. The method according to any one of claims 1 to 21, characterized in that the fibrous web is dried after passing through the press section in a drying section.

23. The method according to claim 22, characterized in that the fibrous web is exposed after passing through the press section of a Impallströmtrocknung.

24. The method according to claim 23, characterized in that the press section (4) only three press nips (14, 15, 16) and that between Pressenpartie (4) and drying section (5) an impingement drying device (42) is arranged.

25. The method according to claim 24, characterized in that the three press nips (14, 15, 16) by a three-nip press (13) with a central roller (21) and two press rollers (25, 26) are formed.

26. The method according to claim 24 or 25, characterized in that the first and / or the third press nip (14, 16) is designed as a shoe press nip.

27. The method according to any one of claims 24 to 26, characterized in that the impingement drying device (42) is designed as a high dryer.

28. The method according to any one of claims 24 to 27, characterized in that at least one drying cylinder (43, 44) of the impingement drying device (42) is slightly sucked.

29. The method according to claim 28, characterized in that for the suction of the drying cylinder (43, 44) stabilizers (54) are used.

30. The method according to any one of claims 1 to 29, characterized in that the fibrous web is fed after drying in the dryer section of a multi-pin calendering device.

31. The method according to claim 30, characterized in that the multi-pin calendering device is an online calendering device.

32. The method according to any one of claims 1 to 31, characterized in that the moisture content of the fibrous web when leaving the dryer section is below the equilibrium moisture content at standard climate.

33. The method according to claim 32, characterized in that the fibrous web is moistened before entering the calendering device.

34. The method according to claim 33, characterized in that the fibrous web is selectively moistened in the cross machine direction.

35. The method according to any one of claims 30 to 34, characterized in that one of the two sides of the fibrous web is brought in a first sequence of nips in each case with a heated roller in contact and that the other of the two sides of the fibrous web following in a second Sequence of nips in each case is brought into contact with a heated roller.

36. The method according to claim 35, characterized in that before each sequence of nips in each case the side of the fibrous web which is brought into contact with the heated roll is moistened.

37. The method according to claim 36, characterized in that the fibrous web is preferably moistened to a moisture content of 7% to 9%, particularly preferably to a moisture content of 8%.

38. The method according to any one of claims 30 to 37, characterized in that the fibrous web is moistened before entering the calendering, preferably to a moisture content of 7% to 9%, more preferably to a moisture content of 8%.

39. The method according to claim 38, characterized in that the fibrous web is moistened on both sides before entering the calendering device.

40. The method according to any one of claims 36 to 39, characterized in that the fibrous web is moistened by means of steam humidifier and / or nozzle moistener.

41. The method according to any one of claims 1 to 40, characterized in that the fibrous web produced is rotogravure paper (SC or SCA + paper).

42. The method according to claim 41, characterized in that the gravure paper has a filler content of 25% or more, preferably 30% or more.