EP0799931A1 - Cylinder press - Google Patents

Abstract

`A roller press for a, esp. paper mfg., machine has a suction press roller (4) which with an encircling felt (6) accepts a material web (A), e.g. cardboard or paper, from a machine wire (1) etc. and a delivery press roller (7) forming a pressure gap (B) with the suction roller and taking the web for delivery to a following machine section. An auxiliary press roller (14, 24) is assigned to suction and delivery rollers to form an additional pressure gap (R, S) with each. A press felt (15, 25) is led over each auxiliary and at least one of the additional gaps is extended in the direction in which the web runs.

Description

The invention relates to a roller press of a machine such as, in particular, a paper machine, with a suction press roll taking over a material web, in particular a cardboard or paper web from a screen or the like, with an associated press felt guided around the suction press roll and with a press nip forming a press nip with the suction press roll, the material web from the suction press roll taking delivery press roll to deliver the material web to a subsequent part of the machine.

Such a roller press is used in particular to dewater the material web in question. Here, the drainage performance achieved depends, among other things, on the number of press nips. However, there are generally limits to increasing the number of press nips. So it has already been proposed to add at least one further separate roller pair to the roller pair formed from the suction press roller and the discharge press roller to form a respective additional roller gap. However, the resulting space requirement is considerable. The open trains that result between the respective roller pairs are also problematic.

The aim of the invention is to provide a roller press of the type mentioned at the outset which, with minimum space requirement, has a higher press output, i.e. ensures a higher drainage capacity.

The object is achieved according to the invention in that both the suction press roll and the discharge press roll are each assigned at least one additional press roll in order to at least each with the suction press roll or the discharge press roll to form an additional press nip, a press felt being passed over each additional press roll, and that at least one of the additional press nips is an extended press nip in the running direction of the material web.

This design results in an extremely compact roller press with high press performance. In the simplest case, a roll arrangement comprising three press nips results from only four rolls with double-sided dewatering in the area of the first press nip between the suction press roll and the associated additional press roll, at least one-sided dewatering in the area of the press nip between the suction press roll and the delivery press roll and an at least one-sided Drainage in the area of the third press nip between the delivery press roll and the additional press roll assigned to it. In addition, there is a closed web guide with pre-dewatering of the cardboard or paper web starting from the screen-side take-over point to the delivery point. Due to the rewetting reduced to a minimum, a maximum dry content can be achieved. Due to the lack of open draws between the roller arrangements, any paper stretching is also excluded. There are no losses in wet strength. The first open tension only occurs after the press arrangement with maximum wet strength. A decisive advantage of the invention can be seen in particular in the fact that, due to the at least one extended additional press nip, despite the extremely compact roller arrangement, a significantly higher pressing performance or dewatering performance is achieved.

It is particularly advantageous here if at least the additional press nip between the discharge press roll and the associated additional press roll is an extended press nip.

In a preferred embodiment of the roller press according to the invention, the suction press roller rests on the associated press felt for the direct takeover of the material web on the wire. This simplifies the takeover of the material web with the simplest construction.

Advantageously, at least one of the additional press rolls is a deflection compensating roll with a rotating roll shell, a yoke penetrating the roll shell and at least one hydrostatic and / or hydrodynamic support element, by means of which the roll shell is supported on the yoke.

In a preferred embodiment, the suction press roll, the dispensing press roll and the additional press rolls are arranged and / or supported in such a way that the forces of the press nips are short-circuited to one another and are not absorbed by the machine foundation and / or a possibly provided outer frame.

According to a preferred embodiment of the invention, it is provided that the discharge press roll is assigned at least one additional press roll designed as a deflection compensating roll with a flexible roll shell, a yoke penetrating the flexible roll shell and at least one non-convex hydrostatic and / or hydrodynamic support element in order to be able to run in the running direction with the discharge press roll the material web to form an extended press nip.

Due to the lengthened press nip that results between the delivery press roll and the associated additional press roll optimum drainage performance is achieved while maintaining a compact roller arrangement consisting of a small number of rollers.

Preferably, the suction press roll is also assigned at least one additional press roll designed as a deflection compensation roll with a flexible roll casing, a yoke passing through the flexible roll casing and at least one non-convex hydrostatic and / or hydrodynamic support element, in order to form a press nip extended in the running direction of the material web with the suction press roll. which further optimizes drainage performance.

The dispensing press roller can also advantageously be a deflection compensation roller with a rotating roller shell, a yoke passing through the roller shell and at least one hydrostatic and / or hydrodynamic support element, by means of which the roller shell is supported on the yoke.

Such a delivery press roll designed as a deflection compensation roll preferably has a rigid roll shell. In principle, however, this roller can also be provided with a flexible jacket.

The roll shell of a delivery press roll designed as a deflection compensation roll can be fixed radially at least at its ends during operation. This at least essentially excludes radial movements during operation. A respective position can thus be maintained even under pressure.

In particular, in the event that the discharge press roller is assigned at least one additional press roller designed as a deflection compensation roller and also the discharge press roller is a deflection compensating roller, the hydraulically actuated hydrostatic and / or hydrodynamic support elements of the additional press roller and the discharge press roller can advantageously be hydraulically coupled to one another, which is advantageous, for example, in connection with position control.

In order to achieve the most defined possible conditions, the dispensing press roll is preferably fixed in a defined position on a stand, which in turn is firmly mounted on the machine foundation, without the possibility of radial deflection.

The dispensing press roll can be designed as a deflection compensation roll with a flexible roll casing, a yoke passing through the flexible roll casing and at least one non-convex hydrostatic and / or hydrodynamic support element in order to form a press nip which is extended in the running direction of the material web with the associated additional press roll and / or suction roll.

If, in addition, the additional press roll assigned to the delivery press roll is a deflection compensation roll with a flexible roll jacket, the support elements of the delivery press roll and the associated additional press roll on its side facing the relevant roll jacket can advantageously be at least essentially flat in order to form an at least essentially flat press nip .

In certain cases it can be useful to design at least one of the rolls as a deflection compensation roll with a radially displaceable roll shell. In this case, the roll shell in question is preferably rigid.

In principle, however, it is also possible to use a flexible roller jacket here.

Again, in order to achieve the most defined possible conditions, at least the press nip formed between the dispensing press roll and the associated additional press roll is expediently held in a certain position during operation by a corresponding position control.

The suction press roll can be a hollow roll with a roll jacket that is supported on the inside around a core. In this case, the suction roll is preferably provided with an outer suction box through which an area located inside the roll is sucked off.

Further advantageous design variants of the roller press according to the invention are specified in the subclaims.

Figur 1

eine vereinfachte schematische Teildarstellung einer Ausführungsform einer Walzenpresse,

Figur 2

eine vereinfachte schematische Darstellung einer weiteren Ausführungsform der Walzenpresse,

Figur 3

eine Teildarstellung der in Figur 2 gezeigten Walzenpresse mit angedeuteten Kraftflußverläufen in den Spaltbereichen,

Figur 4

die in Figur 2 gezeigte Walzenpresse in einer Phase, in der der Preßfilz für die Saugpreßwalze ausgewechselt wird,

Figur 5

die in Figur 2 gezeigte Walzenpresse in einer Phase, in der der Preßfilz für die der Abgabepreßwalze zugeordnete zusätzliche Preßwalze ausgewechselt wird,

Figur 6

die in Figur 2 gezeigte Walzenpresse in einer Phase, in der der Preßfilz für die der Saugpreßwalze zugeordnete zusätzliche Preßwalze ausgewechselt wird,

The invention is explained below using exemplary embodiments with reference to the drawing; in this show:

Figure 1

a simplified schematic partial representation of an embodiment of a roller press,

Figure 2

a simplified schematic representation of a further embodiment of the roller press,

Figure 3

3 shows a partial representation of the roller press shown in FIG. 2 with indicated force flow profiles in the gap areas,

Figure 4

the roller press shown in Figure 2 in a phase in which the press felt for the suction press roll is replaced,

Figure 5

the roll press shown in Figure 2 in a phase in which the press felt for the additional press roll associated with the discharge press roll is replaced,

Figure 6

the roll press shown in Figure 2 in a phase in which the press felt for the additional press roll associated with the suction press roll is replaced,

A roller press of a machine, in particular a paper machine, is shown in FIG. 1 in a simplified schematic representation. This roller press comprises a web of material such as, in particular, a cardboard or paper web A from a wire 1, a suction press roll 4 with an associated press felt 6 guided around the suction press roll 4 and a press nip B forming a press nip B with the suction press roll 4, the cardboard or paper web A from Suction press roll 4 taking delivery press roll 7 for dispensing the cardboard or paper web A an adjoining machine part.

As can be clearly seen, for example, from FIG. 1, the suction press roll 4 lies against the screen 1 via the associated press felt 6 in such a way that it takes over the material web A directly.

Both the suction press roll 4 and the delivery press roll 7 are each assigned an additional press roll 14 or 24 in order to form an additional press nip R, S with the suction press roll 4 or the delivery press roll 7, respectively. A press felt 15, 25 is in turn guided over each additional press roll 14, 24.

This end of a wire section of the paper machine shown in FIG. 1 further comprises wire rollers 2, 3, around which the wire 1 is guided. Here, the suction press roll 4 lies against the assigned press felt 6 in the area between the two screen rolls 2, 3 on the screen 1.

The cardboard or paper web A formed on the screen 1 is lifted off the screen 1 by the press felt 6 and the suction press roll 4 and then passed in succession through the three press nips R, B and S. Two-sided dewatering takes place in the first press nip R between the suction press roll 4 and the associated additional press roll 14 due to the press action of the suction press roll 4 or the press felt 15 associated with the additional press roll 14. In contrast, the press nip B formed between the suction press roll 4 and the delivery press roll 7 takes place only one-sided drainage due to the suction effect of the suction press roll 4. In the press nip S formed between the discharge press roll 7 and the additional press roll 24 associated therewith, unilateral drainage also occurs again, which is achieved by the press felt 25 assigned to the additional press roll 24.

In the exemplary embodiment shown in FIG. 1, the suction press roll 4 is designed as a hollow roll with a rigid roll shell 30 which can be supported on its inside and rotates around a core 32.

Here, the suction press roll 4 is provided with an outer suction box 34, through which an area 36 located inside the roll is sucked off.

In the embodiment shown in Figure 1, both additional press nips R and S in the direction of the web A extended. The same applies in the present case to the press nip B between the suction press roll 4 and the delivery press roll 7.

For this purpose, both the two additional press rolls 14, 24 and the discharge press roll 7 are each designed as deflection compensation rolls with a rotating roll jacket 17, 26, 38, a yoke 16 passing through the roll jacket and at least one hydrostatic and / or hydrodynamic support element 18, 27, 40, by which the relevant roll jacket 17, 26, 38 is supported in the respective gap area on the yoke 16. The roll shell 38 of the delivery press roll 7 is thus supported not only in the area of the press nip S, but also via the at least one hydrostatic and / or hydrodynamic support element 40 in the area of the press nip B formed with the suction press roll 4.

The roll jacket 26 of the additional press roll 24, which is designed as a deflection compensating roll and is assigned to the discharge press roll 7, is flexible. The hydrostatic and / or hydrodynamic support element 27, which can be seen in FIG. 1 and is assigned to this additional press roller 24, is not convex on its side assigned to the roller shell 26, in the present case it is flat. The same also applies to the hydrostatic and / or hydrodynamic support element 27 assigned to the opposite delivery press roll 7, which supports the roll jacket 38 of the delivery press roll 7, which is also flexible in the present case. This results in a flat press nip S elongated in the running direction of the cardboard or paper web A.

In contrast, the support element 40 arranged on the opposite side of the yoke 16 of the dispensing press roll 7 is provided with a concave contact surface, through which the flexible roll jacket 38 against the rigid roll jacket 30 of the suction press roll 4 is pressed. Here too, however, a press nip B is formed which is elongated in the running direction of the cardboard or paper web A.

The additional press roll 14 assigned to the suction press roll 4 is in turn designed as a deflection compensation roll with a flexible roll jacket 17, a yoke 16 passing through the flexible roll jacket 17 and at least one non-convex hydrostatic and / or hydrodynamic support element 18. In the present case, this support element 18 has a concave contact surface. This extends over a larger part of the circumference of the suction press roll 4 than the concave contact surface of the support element 40. A press nip R which is extended in the running direction of the cardboard or paper web A is thus formed between the suction press roll 4 and the additional press roll 4 associated therewith.

In particular, the additional press roll 24 assigned to the dispensing press roll 7 can also be provided with a roll shell which has recesses for receiving press water. These recesses can be provided, for example, in the form of circumferential grooves and / or blind holes.

The yokes 16 of the deflection compensation rollers are stationary, at least during operation. In addition, the dispensing press roll 7 in particular can be provided with a roll jacket which is fixed radially at least at its ends during operation.

According to FIG. 1, the suction press roll 4, the delivery press roll 7 and the additional press roll 24 associated therewith lie on a straight line which includes an angle with the vertical which in the present case is, for example, approximately 45 °. The additional pressure roller 14 assigned to the suction pressure roller 4 is arranged on the right below the suction pressure roller 4. The straight line running through the axes of these two rolls forms a right angle with the straight line running through the suction press roll 4, the discharge press roll 7 and the additional press roll 24 associated therewith.

In the embodiment shown in FIG. 2, the additional press roll 24 assigned to the delivery press roll 7 is arranged directly above the delivery press roll 7, so that the straight line extending through the axes of these two rolls runs in the vertical direction. Otherwise, the roller press shown in FIG. 2 has essentially the same structure as the press shown in FIG. 1. The same reference numerals have been assigned to corresponding parts.

The respective mounting of the rollers also results from FIG.

Thus, the dispensing press roll 7 is firmly attached to a stand 42 in a defined position without the possibility of radial deflection, which in turn is fixedly mounted on the machine foundation 44.

The jacket of the dispensing press roll 7 can be at least substantially radially fixed at its ends, at least during operation, so that it maintains a substantially unchanged position even under pressure.

Position control can ensure that the press nip S remains in a predetermined position. In this position, it is thus kept independent of the respective pressing force and the respective machine speed. For this purpose, at least one position sensor and a pressure force control can be provided for at least one of the supporting elements in question.

As can be seen in particular from FIGS. 2 and 3, the rollers 4, 7, 14 and 24 forming the three press nips are braced and / or connected to one another during operation so that practically no pressing forces have to be absorbed by other frame elements. These are only to be picked up by the assigned bearing parts that support the roll neck or the roll yokes.

In Figure 3, the corresponding force flow curves resulting in the area of the three pressing points are indicated by bold lines. Accordingly, there are self-contained lines of force via the respective press nips, which means that the generally relatively high press forces only have to be absorbed by the associated bearing parts which support the roll neck or the yokes. The other chair elements therefore do not need to be designed for these high pressing forces.

The connecting elements provided between these bearing parts can be released for a roll or clothing change.

In Figure 4, the roller press of Figure 2 is shown in a phase in which the press felt 6 for the suction press roll 4 is replaced. After loosening the connecting elements to the dispensing press roll 7 and to the additional press roll 14, the press felt 6 is carried freely by a cantilever 46 on the operator's or operator's side. This is supported on the drive side. The intermediate pieces 48 shown in FIG. 2 were previously removed, for which purpose the bearing arrangement above them was first lifted by means of a crane.

The press felt 6 previously stretched over a deflection roller 50 (cf. FIG. 2) is partially wound onto a roller 52 according to FIG.

FIG. 5 shows the roll press of FIG. 2 in a phase in which the press felt 25 for the additional press roll 24 assigned to the discharge press roll 7 is replaced after the corresponding intermediate pieces 48 (see FIG. 2) have been removed.

To replace this press felt 25, the connecting elements of the additional press roll 24 to the dispensing press roll 7 and to the chair on the driver's side are first released. The additional press roller 24 is then raised by a support device which can be fastened to the yoke and around which the felt has previously been draped.

The press felt 25 previously stretched over a deflection roller 54 (see FIG. 2) is partially wound onto a roller 56 according to FIG.

The frame chair is intended exclusively for carrying the felt running devices and for taking up the dead weights of the pressing devices. It is therefore not used to absorb pressing forces exerted on the cardboard or paper web.

The frame frame can be integrated in the upstream shaping and screening section and can have appropriate interruption devices provided on the driver's side for changing the screen. Here, the frame is carried by the cantilever of the suction press roll 4 on the driver's side.

The entire press arrangement has no parts of the frame in front of the paper machine on the machine floor, ie that in front of the driver's machine beam on which the Frame stand and the stand of the dispensing press are supported, is free of such parts of the chair.

According to FIG. 6, for a change of the press felt 15 guided around the additional press roll 14, the additional press roll 14 is lowered after a release of the connecting elements on the driver side to the suction press roll 4 on the driver side by a support device which can be fastened to the yoke of the press roll 14 and around which the new felt is draped beforehand has been. The support device can be, for example, a push-on tube.

For each roll change, the roll press can have a crane rail that runs transversely to the paper machine and should at least perform the following functions:

This crane rail 58 should initially serve as an extension aid for carrying the drive end of the suction roll 4. Furthermore, it is used as a run-in aid for carrying the drive-side end of the felt-in device for the press felt 6 assigned to the suction press roll 4. Finally, it can also serve as a run-in aid for carrying the drive-side end of the felt-in device for the press felt 25, which is around the additional press roll associated with the discharge press roll 7 24 is performed.

The roller press according to the invention has the following advantages, among others:

The result is a closed web guide from the pick-up location on the screen to the end of the press. Overall, a low level of rewetting is guaranteed, which results in a high level of dryness. Since there are no open trains between the press, there is no paper stretching and no loss of wet strength. The first open tension after the press is at maximum wet strength. Since there is only one transfer point after the press section, maximum wet strength is guaranteed.

Even with a production width variation, it is always possible to ensure a constant paper width through all press nips or nips. A variable edge strip runs off the central roller. It is also essential that felts and rollers can always be run with the same paper width. The desired high dry content can be achieved in particular with only one shoe press, which entails a smaller number of rollers.

In addition, there is an extremely compact design, which in addition to saving space is particularly important for problem-free conversions.

There is a direct flow of force for all nips. There is no portal seating. No external stands are provided on the driver's side. More space is created in front of the machine. There is no ceiling load.

Furthermore, good accessibility is ensured by the bridge frame. A respective change of felt and roller is possible without any problems. In addition, better accessibility for adjustment, maintenance and cleaning work is ensured.

If there is no cross member above the press, an optimal nip arrangement results as a 4-roll NipconFlex combi press.

With a fixed driven central roller (Nipco-P roller), a stationary web running geometry results after the press after this roller has been mounted on a stand. A stable scraper connection is also possible. The arrangement is also insensitive to drive vibrations.

In addition, there is a high level of operational reliability for a respective shoe press in such an installation position. The closed web inspection reduces the risk of chunks to a minimum. Manual application (using a glass tube) is eliminated, as are the two nips for pre-calibration in front of the shoe press. With inverted shoe arrangement, optimal press jacket lubrication results.

Despite the compact design, a relatively simple roll change is possible. The press rolls can be replaced independently of one another in a short amount of time. Extending devices can be provided for all the press rolls. There is only a short-term use of the crane. In principle, however, it is also possible to change the roll without a crane, for example using rails in front of the machine.

The press felt associated with the suction press roll can be fully cantilevered. The felt can be easily replaced using a felt changing entry device.

The upper felt can be portrayed by means of a press jacket changing device. Again, a felt change entry device can be provided.

The bottom felt is portable (slip-on tube on Nipco yoke). Internally extendable felt guide rollers can be provided.

In addition, improved accessibility for Scanpro measurements is achieved.

Ultimately, this results in an inexpensive press concept. Since no separate NipcoFlex press is provided, only a few reserve rollers are required. Due to the small space requirement, there is also a low proportion of construction costs.

Reference list

1

Sieve

2nd

Screen roller

3rd

Screen roller

4th

Suction press roll

6

Press felt

7

Dispensing press roller

14

additional press roll

15

Press felt

16

yoke

17th

Roller shell

18th

Support element

24th

additional press roll

25th

Press felt

26

Roller shell

27

Support element

30th

Roller shell

32

core

34

Suction box

36

Area

38

Roller shell

40

Support element

42

Stand

44

Machine foundation

46

Cantilever

48

Spacers

50

Pulley

52

roller

54

Pulley

56

roller

A

Paper web

B

Press nip

R

additional press nip

S

additional press nip

Claims (25)

Roller press of a machine such as a paper machine in particular, with a suction press roll (4) taking over a material web (A) such as in particular a cardboard or paper web from a screen (1) or the like with an associated press felt (6) guided around the suction press roll (4) and with a delivery press roll (7) forming a press nip (B) with the suction press roll (4) and taking over the material web (A) from the suction press roll (4) for delivering the material web (A) to a subsequent part of the machine,
characterized by
that both the suction press roll (4) and the delivery press roll (7) are each assigned at least one additional press roll (14, 24) to each with the suction press roll (4) or the delivery press roll (7) at least one additional press nip (R, S ), with a press felt (15, 25) being guided over each additional press roll (14, 24), and that preferably at least one of the additional press nips (R, S) is a press nip which is extended in the direction of travel of the material web (A). Roll press according to claim 1,
characterized by
that at least the additional press nip (S) between the dispensing press roll (7) and the associated additional press roll (24) is an extended press nip. Roll press according to claim 1 or 2,
characterized by
that the suction press roll (4) rests on the associated press felt (6) on the screen (1) and takes over the material web (A) immediately. Roll press according to one of the preceding claims,
characterized by
that the suction press roll (4), the dispensing press roll (7) and the additional press rolls (14, 24) are arranged and / or supported such that the forces of the press nips (R, B, S) are short-circuited to one another and not by the machine foundation and / or a possibly provided outside seating. Roll press according to one of the preceding claims,
characterized by
that at least one of the additional press rolls (14, 24) has a deflection compensation roll with a circumferential roll casing (17, 26), a yoke (16) passing through the roll casing (17, 26) and at least one hydrostatic and / or hydrodynamic support element (18, 27) through which the roller jacket (17, 26) is supported on the yoke (16). Roll press according to claim 5,
characterized by
that the dispensing press roll (7) has at least one additional press roll (24) designed as a deflection compensation roll with a flexible roll casing (26), a yoke (16) passing through the flexible roll casing (26) and at least one non-convex hydrostatic and / or hydrodynamic support element (27) is assigned in order to form a press nip (S) which is extended in the running direction of the material web (A) with the delivery press roll (7). Roll press according to claim 5 or 6,
characterized by
that the suction press roll (4) has at least one additional press roll (14) designed as a deflection compensation roll with a flexible roll casing (17), a yoke (16) passing through the flexible roll casing (17) and at least one non-convex hydrostatic and / or hydrodynamic support element (18) is assigned in order to form with the suction press roll (4) an extended press nip (R) in the running direction of the material web (A). Roll press according to one of the preceding claims,
characterized by
that the dispensing press roll (7) is assigned at least one additional press roll (24) designed as a deflection compensation roll with a rigid roll jacket (26). Roll press according to one of the preceding claims,
characterized by
that the suction press roll (4) is assigned at least one additional press roll (14) designed as a deflection compensating roll with a rigid roll jacket (17). Roll press according to one of the preceding claims,
characterized by
that the roll shell is provided with at least one deflection compensating roll with recesses for receiving press water in the press nip in question. Roll press according to one of the preceding claims,
characterized by
that the discharge press roll (7) has a deflection compensation roll with a rotating roll shell (38), a yoke (16) passing through the roll shell and at least one hydrostatic and / or hydrodynamic support element (27, 40), by which the roller jacket (38) is supported on the yoke (16). Roll press according to claim 11,
characterized by
that the discharge press roll (7) designed as a deflection compensation roll has a rigid roll shell (38). Roll press according to claim 11 or 12,
characterized by
that the roller jacket (38) of the delivery press roller (7) designed as a deflection compensation roller is fixed radially at least at its ends during operation. Roll press according to one of the preceding claims,
characterized by
that the discharge press roll (7) is assigned at least one additional press roll (24) designed as a deflection compensating roll, that the discharge press roll (7) is a deflection compensating roll and that the hydraulically actuated hydrostatic and / or hydrodynamic support elements (27) of the additional press roll (24) and the Dispensing press roll (7) are hydraulically coupled. Roll press according to one of the preceding claims,
characterized by
that the dispensing press roller (7) is preferably rotatably mounted on a stand (42) on which it can be fixed in a defined position without the possibility of radial deflection, the stand (42) in turn being firmly mounted on the machine foundation. Roll press according to one of the preceding claims,
characterized by
that the delivery press roller (7) is a deflection compensation roller with a flexible roller shell (38), a yoke (16) passing through the flexible roller shell (38) and at least one non-convex hydrostatic and / or hydrodynamic support element (27, 40) in order to match the associated one additional press roll (24) and / or the suction press roll (4) to form a press nip (R) extended in the running direction of the material web (A). Roll press according to claim 16,
characterized by
that the additional pressing roller (7) assigned to the discharge press roller (7) is a deflection compensation roller with a flexible roller shell (26) and that the supporting elements (27) of the discharge pressure roller (7) and the associated additional pressing roller (24) on their respective roller shell (26 ) facing side are at least substantially flat to form an at least substantially flat press nip (S). Roll press according to one of the preceding claims,
characterized by
that at least one of the rollers is designed as a deflection compensation roller with a radially displaceable roller shell. Roll press according to one of the preceding claims,
characterized by
that at least the press nip (S) formed between the dispensing press roll (7) and the associated additional press roll (24) is firmly held at a certain spatial position during operation by a corresponding position control. Roll press according to one of the preceding claims,
characterized by
that the suction press roll (4) is a hollow roll with a roll shell (30) which is supported on the inside and runs around a core (32). Roll press according to one of the preceding claims,
characterized by
that the suction press roll (4) is provided with an outer suction box (34) through which an area (36) located inside the roll is sucked off. Roll press according to one of the preceding claims,
characterized by
that a respective felt change entry device is provided for replacing at least one of the press felts (6, 15, 25). Roll press according to one of the preceding claims,
characterized by
that a cantle carrier (46) is provided for replacing the press felt (6) for the suction press roll (4), from which the press felt (6) is carried freely. Roll press according to one of the preceding claims,
characterized by
that for replacing the press felt (25) for the additional press roll (24) associated with the delivery press roll (7), this additional press roll (24) can be raised by a support device which can be fastened to its yoke (16), by which the press felt (25) can be draped beforehand . Roll press according to one of the preceding claims,
characterized by
that for exchanging the press felt (15) for the additional press roll (14) associated with the suction press roll (4), this additional press roll (14) can be lowered by a supporting device acting on its yoke (6), in particular a push-on tube or the like, around which the press felt (15) can be draped beforehand.

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