DE69133030T2 - Method and device for dewatering a paper web by pressing - Google Patents

Abstract

Method and device in the manufacture of paper or board for dewatering of the paper web (W) that is being manufactured. The paper web (W) is transferred from the forming wire (10) onto the wire (80) in the drying section while constantly on support of a fabric that receives water, a transfer febric, or of any other, corresponding transfer surface (105') as a closed draw, at a particularly high speed, which is, as a rule, higher than about 25...30 m/s. Dewatering of the paper web (W) is carried out by means of two subsequent extended press nips (NP1, NP2), whose length (z) in the machine direction is larger than z > about 100 mm. After the first extended press nip (NP1), through which the web is passed between two fabrics (20, 30) the web is transferred by means of a suction roll (40) to a single upper fabric (40) passing through the second extended nip (NP2), which has a smooth faced counter roll (105) in a lower position. <IMAGE>

Description

The invention relates to a method for dewatering a paper web or cardboard web according to the preamble of claim 1, wherein it is based on the document "on the use of shoe presses for writing and printing papers", Wochenblatt für Papierfabrikation No. 3, 1988, page 177, Fig. 15.

Furthermore, the invention relates to a papermaking machine according to the preamble of claim 7, which is based on the above-mentioned prior art document.

One of the most important quality requirements for all paper and cardboard qualities is the uniformity of the structure, both in a microscopic and macroscopic sense. The structure of the paper and in particular of printing paper must also be symmetrical. The good printing properties required of printing paper mean good smoothness, uniformity and certain absorption properties on both sides. The properties of paper and in particular the density symmetry are significantly influenced by the operation of the press section of a paper machine, which is also of crucial importance for the uniformity of the cross-section and longitudinal profiles of the paper.

Increasing running speeds of paper machines create new problems, mainly related to the running quality of the machine. Currently, running speeds of up to approximately 1400 m/min are used. At these speeds, so-called closed press sections, which have a compact combination of press rolls mounted around a center roll provided with a smooth surface, usually work satisfactorily. As an example of such press sections, the press sections "Sym-Press II" and "Sym-Press O" (trademarks) of the applicant of the present patent application should be mentioned. One point that requires development is the central roller in the compact press sections and the material of the roller, which is usually stone, but which, being a natural material, has certain disadvantages.

Dewatering by means of pressing is preferable to dewatering by evaporation in terms of energy consumption. Attempts have therefore been made to remove a maximum proportion of water from a paper web by pressing, so that the proportion of water that has to be removed by evaporation can be made as small as possible. However, the increasing running speeds of the paper machine create new and as yet unsolved problems, particularly in dewatering that takes place by pressing, since the pressing impulse cannot be sufficiently met by the devices known in the state of the art, especially because at high speeds the nip times remain excessively short and, on the other hand, the peak compression pressure cannot be increased beyond a certain limit without destroying the structure of the web.

As paper machine running speeds increase, the problems of paper machine running quality become even more serious, since a low strength aqueous web cannot withstand an extremely high and sudden impulse of compression pressure or dynamic forces generated by the high speeds, but the web breaks and other operational disturbances are caused with the resulting stoppages. In modern printing paper machines, the cost of an interrupted stoppage currently amounts to approximately 40,000 FIM per hour.

Other disadvantages of the prior art press sections include the requirement for suction energy of the suction rolls, which is usually used in them, and also the noise problems that occur with the suction rolls. In addition, the suction rolls with their perforated shells, internal suction boxes and other suction systems are components that are expensive and require repeated maintenance.

Other problems which become more serious at high paper machine speeds and for which, at least not all of them, satisfactory solutions have so far been found include the quality problems relating to the requirements for the uniformity of the longitudinal and transverse property profiles of the paper web. The uniformity of the web to be produced also influences the running quality of the entire paper machine and is thus an important quality factor of the finished paper, which is even more serious with regard to copying paper and printing paper as the requirements for the speeds of copying and printing machines and for the uniformity of the printing result increase. The property profiles of the paper to be produced in the machine direction are also greatly influenced by vibrations of the press section, transverse changes in properties due to the transverse profiles of the nip pressures in the press nips, and with increasing machine running speeds these profile problems tend to increase greatly.

Up to now, running speeds of up to about 40 m/s = 2400 m/min have been considered as running speeds of paper machines. The realization of such high speeds, especially in wide machines, creates even more serious problems to be solved, the most important of which is the running quality of the machine and adequate dewatering performance at high speeds.

With regard to the prior art closest to the invention, reference is made to US Patent Nos. 4,483,745 (Beloit Corp.), 4,526,655 (Valmet Oy), 4,561,939 (Beloit Corp.) and to published patent applications WO-85/00 841 (J. M. Voith GmbH), DE-OS-37 42 848 (Sulzer-Escher Wyss GmbH) and to Finnish patent applications 842 114 (Valmet Oy), 842 115 (Valmet Oy) and 850 665 (Valmet Oy).

Thus, the object of the present invention is to provide new solutions to the problems discussed above in such a way that the above-mentioned disadvantages of the prior art and the disadvantages arising from the wider context are essentially avoided.

An object of the present invention is to provide a method for dewatering a paper web by pressing at high speeds and in particular at speeds of approximately 25 to 40 m/s, such that the adjustability of the press section is versatile, the quality properties of the web produced can be kept high and the web is not subjected to excessive dynamic forces that cause tearing. Furthermore, it is an object of the present invention that the overall structure of the press section and in particular its frame structure should be such that the replacement of press rolls and press fabrics can be carried out quickly, so as to minimize downtime.

With a view to achieving the objects set out above and those which emerge from the wider context, the method according to the invention is characterized by the features of the characterizing portion of claim 1.

On the other hand, the papermaking machine of the invention is characterized by the features of the characterizing portion of claim 7.

In the present invention it has become possible in a satisfactory manner to combine certain partial solutions in a new and inventive manner, some of these solutions being known per se in paper machine technology, so that the problems discussed above, which are of different natures, have been brought under control and solved by means of a new overall concept.

The most important task solved by the present invention is a satisfactory running quality of the paper machine even at speeds as high as about 30 to 40 m/s. This was achieved due to a "linear" tension of the web and a nip structure that creates sufficiently long nip times.

The method and the press section according to the invention are intended for use mainly with thin paper qualities whose basis weight is less than 120 g/m² and for which a closed web tension is essential at the high web speeds mentioned in the invention.

The invention also achieves a sufficiently gentle and soft start of dewatering, which is important since at high speeds the water content in the web after the former also tends to be higher.

According to the invention, the long-nip presses are realized by hose rollers or belt rollers and are provided with a number of different possibilities of adjustment or active regulation, whereby it is possible to

To control the property profiles of the web in both the machine direction and the cross direction.

In the most advantageous embodiment of the invention, a new long-nip press is used in a new way, which has been developed by the applicant of the present patent application and has been brought to the market by the applicant of the present patent application under the trademark "Sym-Belt Press" and which is based on the use of a so-called hose roller. When used in the environment according to the invention, the "Sym-Belt Press" creates various synergistic advantages, of which it should be mentioned that the press produces practically no fluctuations at all, and for this reason it is also well suited for very high speeds, the press allows the nip loads to be kept at a sufficiently low level, especially in the initial section of the press section, and allows the nip times to be kept at a reasonable level, even at very high speeds (30 to 40 m/s).

Furthermore, the "Sym-Belt Press" creates completely new possibilities for controlling and regulating the distribution of the nip pressures in the long nip zone in both the machine direction and the cross direction. Further advantages include low energy consumption, elimination of difficulties related to oil treatment, reduced wear of the hose roll shell and adequate dryness of the web even at high speeds (30 to 40 m/s). Regarding the details of the construction of the hose rolls, reference is made to US patent No. 4 584 059 and to the applicant's Finnish patent applications Nos. 892 517 and 892 518 and Finnish patent No. 66 932.

One possibility for realizing the long nip zone used in the invention is the press solution described in the applicant's Finnish patent application No. 891 380, in which the press wall loop is relatively short and has a run that is guided by a press shoe and a guide roller or an equivalent guide element, and in which solution the ends of the belt are sealed in a novel way. Thus, there is no risk of oil splashing and the distributions of the nip pressures in both the machine direction and the cross direction are adjustable.

In the following, the present invention is described in detail with reference to a number of different embodiments of the invention, which are illustrated in the accompanying drawings, whereby the invention is by no means strictly limited to the details of these embodiments.

Fig. 1 shows a version of the invention provided by two consecutive "Sym-Belt Presses" (trademark of the applicant of the present patent application), whereby of the long nips a press fabric is applied to the latter nip.

Fig. 2 shows an axonometric detail-like sectional view of a hose roller of a "Sym-Belt Press" applicable to the invention.

Fig. 3 shows an axonometric view of a press shoe, which can be loaded and profiled in a versatile manner, which sits inside the hose roller and is applied to a press shown in Fig. 10.

Fig. 4 shows an alternative structure that implements a long gap and is provided with a closed sliding belt loop.

First, the features of the construction of the press geometries shown in Fig. 1 are described. As shown in Fig. 1 in a closed draw of the web in a paper machine or board machine, the press section has a first upper fabric 20 which absorbs water, on which fabric the web W is transferred to the suction zone 21a of the take-up roll 21 at the take-up point P from the web forming wire 10, the return of which starts from the wire drive roll 12. According to Fig. 1, the press has two consecutive press nips which efficiently remove water from the web W and between which the web W has a completely closed draw such that it is constantly supported by a fabric. In Fig. 1, both nips NP₁ and HP₂ are so-called long nips, the press zone of which is considerably longer than in a normal sharp nip. The detailed embodiments of the long gaps are referred to again below mainly in connection with the description relating to Figs. 2, 3 and 4.

In Fig. 1, the first upper fabric is guided by aligning, tensioning and guiding rolls 22 and conditioned by conditioning devices 23. The first extended nip NP₁ has a lower fabric 30 which receives water and is guided by aligning, tensioning and guiding rolls 32 and conditioned by conditioning devices 33. The first extended nip NP₁ and also the second extended nip NP₂ are realized in a "Sym-Belt Press" of the applicant of the present patent application and the details of the construction of this press are explained below. With regard to its main features, the construction of the press is such that the extended nip NP₁ consists of a flexible sleeve and a counter roll Inside the hose casing there is a hydrostatically and/or hydrodynamically lubricated slide shoe 210, the hydraulic loading device being used in conjunction with the shoe and pressing the shoe 210 against the counter roll 35, 55 provided with a hollow side. The counter roll 35, 55 is a press roll provided with a hollow side, such as the adjustable crowning roll "Sym-Z Roll" (trademark) of the applicant of the present patent application.

According to Fig. 1, the press section has a second upper fabric 40, to which the web W is transferred as a closed draw by means of the suction zone 41a of the suction roll 41. After the first nip NP1, it is ensured that the web W follows the first lower fabric 30 by means of a suction box 36 or a corresponding foil structure. The second upper fabric 40 is guided by alignment, tensioning and guide rolls 42 and conditioned by conditioning devices 43.

According to Fig. 1, the second extended nip NP₂ is also designed in connection with a hose roll 45, which is similar to the hose roll in the extended nip NP₁. The lower press element at the nip NP₂ is a press roll 105 provided with a smooth side 105', in connection with the lower sector of which operates a doctor blade 107 which doctor blades the web WO going to the broke treatment and the guide belt to the broke treatment assembly (not shown) arranged below. The smooth side 105' of the press roll 105 ensures that after the extended nip NP the web W follows the side 105' of the lower roll 105, from which it is detached by means of a transfer nip Ns and, supported on the drying wire 80 guided by the guide roll 81, is transferred to the drying section, of which the first heated drying cylinders 82 and guide cylinders 83 are shown in the drawings. A single wire draw is used at least in the first cylinder group in the dryer section.

From Fig. 1 it can be seen directly that the path of the web W to be pressed through the press section is highly linear without major curves. Due to the linear path of movement of the web, the dynamic forces applied to the web remain sufficiently low with a view to minimizing the risk of web breakage. In preferred embodiments, the size of the angle a of the change in direction of the web W in the area a is around 10 to 30º and is usually a < 15º. An exception to this can be formed by the take-up roller 21 and its suction zone, where even a high negative pressure can be applied locally, and in Fig. 1 by the lower press roller 105 provided with the smooth side 105' and its turning sector b. For the reasons set out above, a press geometry shown in Fig. 1 is not preferred when the maximum speed range (30 to 40 m/s) of the applications of the invention is used.

In the press structure described above, the closed draw is realized in such a way that it is possible to minimize the dynamic forces applied to the web W and the risks related to web travel. Thus, the running quality is satisfactory even at high speeds (30 to 40 m/s). Moreover, if long nips NP₁ and NP₂, realized by means of hose rolls 200; 300, are applied to a press section according to the invention, it is possible to ensure sufficient dewatering performance and sufficient dry content even at high speeds without applying compression stages with extremely high peak pressures to the web W. Another significant property of the long nip presses used in the invention is that they practically do not experience vibrations.

It is a further important feature of the invention that the length z of the long nip zones NP₁ and NP₂ (z is usually in the range of z = 100 to 300 mm) in the machine direction is sufficiently long so that sufficiently long nip times are generated at the high speeds (25 to 40 m/s) and also a sufficient compression impulse, although the compression peak pressure is kept appropriate and such that even a web with a very high water content (for example k₀ 10%) can be pressed without deterioration of the structure of the web. The length z of the long nip zones NP₁ and NP₂ in the machine direction in the invention is usually always z > 100 to 300 mm and preferably z = 200 mm. In such a case, it is important for the long nips NP₁ and NP₂ to be long enough to be able to press the web with a very high water content (for example k₀ 10%). possible to apply maximum compression pressures that are in the order of p = 3-9 MPa and preferably in the range of p = 5-8 MPa.

As can be seen from Fig. 1, the passage of the paper web W through the entire press section is extremely "linear" and essentially horizontal.

The hose rolls 200 and 300 used in the embodiments of the long nips NP used in the press section according to the invention are described below with reference to Figs. 2, 3 and 4.

According to Fig. 2, the hose roller 200 has an elastic jacket 201, which is made of, for example, a fiber-reinforced polyurethane, so that the hose jacket 201 is made of a rubber-like stretching material, the maximum stretch of which is, for example, approximately 20 to 40%. The thickness of the hose jacket 201 is, for example, approximately 2 to 5 m. Ring-like ends 202a and 202b are permanently fixed to the hose jacket 201, with inner portions of the ends being fixed and sealed to rotating axle journals 207a and 207b. which are mounted on the frame sections 110 of the machine by means of fixed bearing supports. The hose roller 200 has a stationary inner frame 205 around which the hose jacket 201 rotates with its ends 202a and 202b on the bearings 206a and 206b.

As shown in Fig. 3, cylinder block sets 203, i.e. two sets, are inserted side by side into the inner frame 205. Hydraulic support elements 206 and 207 of the sliding shoe 210 act in the bores arranged in the sets of cylinder blocks 203, these elements thus being arranged one behind the other in two rows, for example with a distance of approximately 20 cm in the transverse direction. The two rows of hydraulic support elements 206 and 207 support a support plate 209, to which a sliding shoe 210, for example made of aluminum, is attached, in the area of which a long gap zone NP is formed on a counter roller. The sliding shoe 210 is provided with a smooth sliding side 211, which acts as a pressing element against the smooth inside of the hose casing 201. The sliding shoe 210 has a series of hydrostatic chambers 212 arranged one behind the other, which chambers contribute to the formation of a hydrostatic loading pressure and to the oil lubrication of the sliding side 211. Each of the successive cylinder blocks 203 is connected to a pipe connection 214 to which pipes 213 for a loading medium are connected so that a separately adjustable pressure can be supplied to each individual block in the row of cylinder blocks 203. In this way, the pressure profile in a long gap zone NP can be adjusted and precisely controlled in a variety of ways both in the machine direction and in the transverse direction. The pressure ratio p₂/p₁ of the two different rows of support elements 206 and 207 is usually fixed as p₂/p₁. = 1.5 to 2, whereas the pressure applied to each block can be freely adjusted within certain limit values.

An example of the distribution of the nip pressure in a long nip zone NP is such a distribution in the machine direction where the nip pressure (the pressure applied to the web W) at the leading edge of the shoe 210 increases due to the hydrodynamically generated pressure to about 40 bar, whereupon the pressure remains fixed at this value, and in the trailing area of the shoe there is still a pressure increase, while the peak pressure is about 70 bar, from which value the pressure suddenly becomes 0 at the trailing edge of the shoe 210. As stated, the distribution of the pressure can be varied so that an optimal pressing result is achieved. In any case, the compression pressure on the hose roll 200 and the distribution of the pressure in the machine direction can be arranged such that the start of the dewatering, while the dry content of the web W is still relatively low, can be carried out so gently that the fiber structure of the web W is not deteriorated.

In Fig. 2 an adjustment system relating to the invention is shown, by means of which the pressure profiles of the long nip NP in the cross direction and in the machine direction can be controlled. The adjustment system is represented by the block 250, from which a series of adjustment signals c₁ are issued, which adjust the hydraulic pressures supplied through the pipes 213. In addition to the adjustment system 250, a feedback signal is received from separate lines 214, which is represented by the series of signals c₂. Furthermore, the system 250 is connected to a measuring setup 260, by means of which the various profiles of the produced paper web W, such as the moisture profile or the thickness profile, are measured and from which a series of feedback signals c₁ are provided to the adjustment system 250, which adjusts the series of setting signals c₁ are generated.

The hose roller 200 is oil-tight and the interior of the hose 201 can be set up with a slight pressure. A slight oil leakage occurs from the sliding sides of the sliding shoes 210, whereby this oil is collected from the inside of the hose jacket 201 and returns to the oil circulation through the pipe 215.

The hose roller 200 shown in Figs. 2 and 3 is preferably mounted on fixed bearing supports, in which case the long gap NP must be opened by means of a movement of the counter roller. This is necessary because a play of, for example, approximately 40 mm for the movement of the slide shoes 210 of the hose roller is not sufficient to sufficiently open the gap NP, for example for exchanging the fabrics.

Fig. 4 shows a second embodiment of a hose roller 300. A loop of a belt 301 is used which is longer than the circular hose casing 201. The belt 301 is guided from the inside and the long gap NP is loaded by a hydrostatically and hydronamically loaded sliding shoe 310 which sits inside the loop of the belt 301 and has a hydrostatically loadable series of pressure fluid chambers 2312 in the area of the long gap NP. Inside the belt loop 301 sits a beam 305 which is provided with a series of hydraulic loading elements 306 and 307 by means of which the sliding shoe 310 can be loaded in a controlled manner. The belt loop 301 is guided by a guide roller 311, in which connection a spreader roller 312 is effective. The two ends of the belt loop 301 are closed by means of end pieces so that oil leakage and splashing are prevented, whereby a piece 312a of the end pieces is shown in Fig. 4. The detailed embodiment of the belt roller shown in Fig. 4 is based on the Finnish patent application No. 891 380 (which is assigned to the US Patent application 486 754) of the applicant of the present patent application.

The counter roll used in a long nip NP shown in Fig. 4 is a roll 160 with adjustable crowning and, for example, a roll with adjustable crowning marketed by the applicant of the present patent application under the trademark "Sym-Z Roll", which forms a long nip NP by means of its sector C with the belt roll 300. A corresponding roll can be used together with the hose roll 200. The roll 160 has a cylinder jacket 161, against the smooth inner side 162 of which acts a series of sliding shoes 165, which are provided with hydraulic lubrication and loading chambers 166. The series of shoes 165 is loaded by means of a series of hydraulic actuators 164. When the backing roll 160 is used together with the fabric 60 as an element that absorbs water, the outside of the shell 160 is provided with a hollow side. On the other hand, when the main purpose of the roll 160 is to heat the web 60, for example by means of induction heating devices 170, the smooth shell side is applied to the roll.

According to Fig. 4, a heating device is provided in connection with the shell 161 of the roll 160, ie for example an induction heating device 170, by means of which the temperature profile of the roll shell and thereby the profile and the dewatering performance of the extended nip can be influenced. The roll 160 can also be used so that it has a smooth outer side and that the web W is pressed directly through it, in which case there is no fabric 60 in between, and in this way the web W can be heated directly, thereby influencing the viscosity of the water present in the web and the elastic properties of the web W, thus improving the dewatering and the cross profile of the dry matter content.

The dry content kout of the web, when it emerges from the press section according to the invention, is generally in the range kout = 35 to 65 and preferably in the range kout = 40 to 55.

Claims (13)

1. A method for dewatering a paper web or board web by pressing in a paper machine in which the web (W) passes from a web forming section to a press section and subsequently to a drying section, the paper web having been subjected to draining in the web forming section, the dewatering being effected by the paper web passing on water absorption fabrics through the press section having two successive dewatering long nip presses (NP1, NP2) formed by a hose roll or a belt roll and a counter roll, the web having a closed draw which is constantly supported by a water absorption fabric from the take-up point (P) of the web forming wire (10) to the second long press nip (NP2), the method comprising the following steps: a) transferring the web from the receiving point (P) on the web forming wire (10) to the lower side of a first upper water absorption fabric (20); b) Passing the web between the first upper fabric (20) and a first lower water absorption fabric (30) through the first long press nip (NP1) c) causing the web to follow the first lower fabric (30) after the first long press nip (NP1); d) transferring the web from the first lower fabric (30) to a second upper water absorption fabric (40); e) passing the web together with the second upper fabric (40) through the second long press nip (NP2); e1) wherein the second long press nip (NP2) is formed between the hose roll or the belt roll at an upper position and a cylindrical roller provided with a smooth side Counter roller 105 is formed at a lower position; e2) wherein the web is in direct contact with the smooth-side cylindrical counter roll (105) during passage through the second extended nip (NP2); and f) passing the web along a part of the circumference of the cylindrical counter roll (105) after the second long nip press (NP2), characterized in that A) the paper web is transferred from the smooth-sided cylindrical counter roll (105) of the second long press nip (NP2) to the drying wire (80) by means of a transfer nip formed between the counter roll and a guide roll (81) around which the drying wire is arranged to pass; B) the length of each of the two consecutive longitudinal gaps (NP1, NP2) is more than approximately 100 mm; C) the web passes through the press section at a speed exceeding approximately 25 m/s; D) the transfer of the web from the first lower fabric (30) to the second upper fabric (40) is effected by means of a suction roll (41) located between the first and second long press nips; E) the distribution of compression pressure in at least one of the long press nips is regulated and/or selected both in the cross direction of the web and in the machine direction of the web to adjust or control the different profiles of the properties of the web. 2. Method according to claim 1, characterized in that the suction roller (41) is wrapped by the second upper fabric (40). 3. Method according to one of claims 1-2, characterized in that the maximum compression pressure (P) used in the long gap zones (NP1, NP2) is set to the range 3-9 MPa and preferably 5-8 MPa, and the distribution of the pressure is preferably adjusted in such a way that at the initial section of the long press nip the compression pressure rises steeply, whereupon the compression pressure is kept substantially constant and at the rear end of the long press nip the compression pressure is regulated in such a way that it is higher than in the region of the constant compression pressure. 4. Method according to any one of claims 1-3, characterized in that the dewatering pressing of the web (W) is started when the dry content of the web (W) is 10% and water is removed from the web so that after the press section its dry content is kout = 35-65% and preferably kout = 40-55%. 5. Method according to one of claims 1-4, characterized in that applying a doctor device (104) to the cylindrical counter roller (105) provided with the smooth side. 6. Method according to one of claims 1-5, characterized in that conditioning the first fabrics (20, 30) and the second fabric (40) with conditioning devices. 7. Papermaking machine in which a paper web or board web (W) which is dewatered by pressing passes from a web forming section to a press section and further into a drying section, the press section having two consecutive long press nips NP1, NP2 and water-absorbing press fabrics (39, 40) which through the long press gap. are used in such a way that the paper web to be dewatered has a closed draw which is constantly supported by a water absorption press fabric from the take-up point (P) on the web forming wire (10) to the second long press nip (NP2), the machine comprising: a) a first loop of an upper water absorption press fabric (20) arranged to pass through the first extended nip (NP1); b) a first lower water absorption press fabric (30) arranged to pass through the first long press nip; c) wherein the first extended nip press (NP1) is formed between a hose roller or belt roller (25) and an opposing counter roller (35); d) a first suction pickup roll (21) within the loop of the first upper press fabric (20) for transferring the web from the forming wire to the first upper press fabric (20); e) a second upper looped water absorption press fabric (40) arranged to pass through the second long press nip (NP2); f) wherein the second long press nip (NP2) is formed between a smooth-sided cylindrical counter roll (105) at a lower position and a tubular roll at an upper position, wherein the paper web is in direct contact with the smooth-sided counter roll (105) in the second long press nip and follows the side of the counter roll after the second long press nip, characterized in that A) the paper web (W) is transferred from the smooth-sided cylindrical counter roll (105) of the second long press nip (NP2) to the drying wire (80) by means of a transfer nip (S) formed between the counter roll and a guide roll (81) around which the drying wire is arranged to pass; B) the length of the two Longitudinal press gap (NP1, NP2) is more than approximately 100 mm; C) a second suction pickup roll (41) is provided between the first and second long press nips to transfer the web from the first lower press fabric (30) to the second upper press fabric (40); D) a doctor blade (107) is arranged on the cylindrical counter roll of the second long press nip (NP2) provided with the smooth side. 8. Papermaking machine according to claim 7, characterized in that the second suction pickup roller (41) is arranged within the loop of the second upper fabric (30). 9. Papermaking machine according to one of claims 7 and 8, characterized in that the first long press nip (NP1) is formed between a cylindrical hollow-sided press roll (35) at a lower position and the hose roll or belt roll (201) at an upper position. 10. Papermaking machine according to one of claims 7-9, characterized in that the doctor blade (107) is arranged so that the paper web passes to a waste material treatment. 11. Papermaking machine according to one of claims 7-10, characterized in that at least one roller of the belt roller or hose roller (200, 300) has a flexible belt loop (301) with closed ends. 12. Papermaking machine according to one of claims 7 to 11, characterized in that at least one Roller of the belt roller or hose roller (200, 300) is a hose roller with closed ends. 13. Papermaking machine according to one of claims 7 to 12, characterized by conditioning devices (23; 33; 43) for conditioning the first fabric (20, 30) and the second fabric (40).