AT510652B1 - APPARATUS AND METHOD FOR TREATING A FIBERWORK - Google Patents

Abstract

Plant for treating a fibrous web (1), the plant comprising a first metering device (6) for applying a treatment agent to a first side of the fibrous web and a second metering device (7) for applying a treatment agent to a second side of the fibrous web and a press nip (N ) formed by two pressing members (2, 2 ') between them and through which the fibrous web passes after application of the treating agent. The system comprises a movement device (8, 8 ') for moving at least one metering device (6, 7) along a movement path (6', 7 ') which follows the surface of the pressing element (2, 2'). Process for treating a fibrous web (1).

Description

Austrian Patent Office AT 510 652 B1 2014-02-15

description

APPARATUS AND METHOD FOR TREATING A FIBERGLAVE FIELD OF THE INVENTION

The invention relates to a system and a method for treating a fibrous web. In particular, but not exclusively, the invention relates to a spray and / or sump press for a fibrous web and a method for treating a fibrous web in a spray and sump press. The plant and method can be used in a paper, board and aftertreatment machine.

BACKGROUND OF THE INVENTION

At certain points in the papermaking or paperboard manufacturing process, paper or paperboard is to be treated with a liquid treating agent, for example, with a size, a pigmenting agent or a coating slip. For applying the treating agent, various techniques are known, such as a ponding application method or a film transferring method.

In the publication Fl 102200 B some examples of a Sumpfleimpressen and a film transfer presses are shown.

The operation with a two-sided pond or swamp deteriorates greatly with increasing operating speed, especially at operating speeds over 1,000 m / min. Operation with a one-sided swamp is slightly better, but the difficulty is to get enough glue on the web. In general, the problem with squeegee presses is the low desiccant level of the glue, which is about 10% at the maximum, but 6 to 8% for a two-sided treatment. Increasing the desiccant level of the glue is particularly limited by the operation of the device. The sump becomes unstable as the level of desiccant is raised and the operating speed is increased.

From the publication WO 2006/058961 a method and a device are known, wherein sprayed from a spray glue on the surface of a paper or board web and then the web is fed into a press nip.

When spraying glue on the fiber web, it has proved difficult to obtain a sufficient amount of glue for the fiber web, especially at large square meter weights, for example, from a weight of 120 g / m2. When glue is applied, a drop of glue may also be present on the fibrous web or the rollers of the size presses.

SUMMARY

According to a first aspect of the invention, a system for treating a fiber web is offered, wherein the system comprises a first metering device for applying a treatment agent on a first side of the fiber web and a second metering device for applying a treatment agent on a second side of the fiber web and a Press nip formed by two pressing members between them and through which the fiber web passes after application of the treating agent, the system comprises a moving device for moving at least one metering device along a movement path which follows the surface of the pressing member.

According to a second aspect of the invention, a method for treating a fibrous web in a plant is offered, comprising a first metering device for applying a treatment agent on a first side of the fibrous web and a second metering device for applying a treatment agent on a second side of the fibrous web and comprises a press nip, which is formed by two pressing members between them and through which the fiber web is guided after application of the treatment agent, wherein the Appendix 1/12 Austrian Patent Office AT510 652B1 2014-02-15 comprises a moving device, with the at least one metering device along a trajectory is moved, which follows the surface of the pressing member.

Preferably, the movement device between a mounting body of the pressing member and the metering device is arranged and includes a guide and stop members, which are arranged to move along the guide on a movement path which follows the surface of the pressing member. A part of the guide can be interrupted and fixed to run with the pressing member with, when the pressing member is lifted away. The trajectory preferably has the shape of a circular arc.

Preferably, the moving device comprises a guide, which is attached to the mounting body for the pressing member, and the moving device comprises stop members which are attached to the metering device and arranged to move along the guide on a movement path, the surface of the pressing member follows.

Preferably, the movement device on the one hand at the end of the metering device and on the other hand on the Au ßenseite attached to the end of the pressing member.

Preferably, the movement device comprises a plate-like guide on which a groove is formed as a guide surface, and on the metering device stop members are mounted, which slide or roll in the groove.

Preferably, the moving device comprises a guide and attached to the guide sprocket and attached to the metering drive disk which is driven by a motor, and the drive disk acts together with the toothing of the ring gear.

Preferably, spray nozzles for spraying a treatment agent on the first surface of the fiber web and / or supply pipes for forming a sump between the first pressing member and the fiber web are arranged on the first metering device.

Preferably, spray nozzles for spraying a treatment agent on the second surface of the fiber web and / or feed pipes for forming a sump between the second pressing member and the fiber web are arranged on the second metering device.

Preferably, the supply pipes are arranged to supply the treatment agent in any manner to the sump, for example over the surface of the pressing member or directly into the sump.

Preferably, the position of the metering device around the pressing member and the angle of attack of the fiber web are adjustable.

The distance between the spray nozzles on the metering device to the press nip can be adjustable with a movement device acting on this metering device.

Preferably, the system is a spray and Sumpfleimpressanlage. The system can also be a film dosing system.

Preferably, the treatment agent is arranged in the system for supplying to the surface of the first pressing member and / or the second pressing member for forming a treating agent film on the surface of the pressing member, and the treating agent film is arranged in the system, by means of the surface of the pressing member in to get to the press nip.

Preferably, the system is a spray and Sumpfleimpressanlage, the nip angle is a maximum of 30 degrees. According to some preferred embodiments, the nip angle of the plant is a maximum of 20 degrees. By a nip angle in this context is meant the angle across a nip between a tangent of the nip roll and the vertical.

The pressing member may be a nip roll or a belt.

The first metering device, the first pressing member and the fiber web are preferably arranged to form between these a dense first injection chamber and / or the second metering device, the second pressing member and the fibrous web are preferably arranged to form a dense second spray chamber therebetween to effectively remove mist and reduce an air-mist mist volume to be aspirated from the spray chamber.

The various embodiments of the present invention will be described only in connection with one or some aspects of the invention. It will be understood by those skilled in the art that any embodiment of any aspect of the invention may be practiced in accordance with the same aspect of the invention, and in other aspects, alone or in combination with other embodiments.

BRIEF DESCRIPTION OF THE FIGURES

The invention will be further described by way of example with reference to the accompanying drawings, in which Figure 1 illustrates an integrated spray and sump sizing apparatus in which an angle of attack of a fibrous web can be changed, moving application bars around a nip roll with a moving device can be sprayed and sprayed from spray nozzles on both sides of the fiber web; Fig. 2 shows the plant of Figure 1, in which a first application bar with Sprühdü sen for a first side of the fiber web and a second application bar is equipped with supply pipes for a to be arranged on the second side of the fiber web sump. Fig. 3 illustrates the plant of Fig. 1 in which a sump is formed on the upper side of a press nip on both sides of the fibrous web; and Fig. 4 illustrates the plant of Fig. 1 in which the first application bar is equipped with feed tubes and the second application bar is with spray nozzles.

DETAILED DESCRIPTION

In the following description similar parts are designated by the same reference numerals. It should be understood that the figures to be presented are not to scale in their entirety and that they are primarily for the purpose of illustrating embodiments of the invention only.

To avoid problems of the prior art, a use of the spray system is also shown as pond Sumpfverimungsvorrichtung. With the same equipment, two desiccants can be used to produce a high desiccant-containing size glue with a high operating speed and product properties, typically with a high-square-weight product and various combinations of sump and spray. For example, with the same equipment, operation can be done only with a one-sided sump, with a one-sided sump simultaneously from the other side, or with a bilateral sump. If the system is suitable for all operating modes, a suitable operating mode can be selected for each situation. When switching from a two-sided injection to a sump spray process, the desiccant and operating speed must be reduced somewhat, but not as much as conventional sump sizing. The illustrated combination of a spray and sump sizing device also reduces dripping problems under certain circumstances, since the angle of attack of the web can be converted to such that no dripping machine elements are present above the web.

Furthermore, the system can be driven at least on one side using the desiccant and operating speed potential of the method with a spray mode. [0033] FIGS. 1 to 4 illustrate a treatment plant for a fiber web 1, which comprises application bars 6, 7 for applying the treatment agent. The treatment agent can be sprayed onto the surface of the fiber web 1 with the application beams 6, 7 and / or the treatment agent can be supplied to the sump 5 to be formed between the fiber web 1 and the roll 2, 2 '. The application bar may include spray nozzles 3 and / or feed tubes 4.

The treatment plant for the fibrous web comprises moving devices 8, 8 'for moving the application bars around the nip rolls 2, 2'. Thus, the spraying position of the fibrous web treating agent for the fibrous web can be changed, and the distance of the spraying position from the press nip N can be appropriately selected. With the choice of the injection position distance to the press nip N, the duration of action of the treatment agent on the fiber web and thus on penetration of the treatment agent into the fiber web 1 can be acted upon. Also, the angle of attack of the fiber web to the nip N can be changed. Moving the application bars around the nip rolls 2, 2 'in this manner allows both the spray unit and the sump sizing unit to be integrated into the treatment plant for the fibrous web. If necessary, a bilateral sump 5 for the web can also be formed on the upper side of the press nip N.

When using the application beam as a spray bar, the spray chamber formed by the spray bar, the nip roll and the web between them can be kept sealed at all angles of incidence of the web against the nip roll. The tightness of the injection chamber essentially has an effect on the amount of mist removal required in the injection process for the glue. An arrangement according to the invention thus allows at all angles of attack of the web an optimal function for the process. The movement devices preferably act on the ends of the application bars. Preferably, the moving devices 8, 8 'are arranged on the outside of the ends of the nip rolls 2, 2'. Thus, in some embodiments, the nip rolls may be lifted away, for example, for change or maintenance, without having to remove the moving devices 8, 8 'or the application bars 6, 7. The nip roll can be repaired in place, for example, the roll cover can be ground when the metering device is moved with the moving devices. The movement path for the application bars 6, 7 made possible by the movement devices is preferably circular.

The fiber web 1 is guided from above via a guide roller 20 in the press nip N formed by the nip rollers 2, 2 'between them. The guide roll can be moved back and forth along the trajectory 20 'of the fibrous web 1 to change the angle of attack to suit the treatment process permitted by the spray and sump sizing unit.

By means of the moving devices 8, 8 ', the application beam 6, 7 can be brought into different positions around the nip roll 2, 2', for example in maintenance, home position, supply and insertion positions.

The first application bar 6 for the spray and Sumpfschleimungsanlage is shown on the left in the figure. At the first application bar 6, the first moving devices 8 are arranged. On the second application bar 7, the second movement devices 8 'are arranged, which comprise actuators corresponding to the first movement devices, and the second movement devices 8' operate in a corresponding manner as the movement devices 8 for the first application beam. With the movement devices 8, 8 ', the first application bar 6 can be moved along the circular trajectory represented by an arrow 6' and the second application bar 7 along the circular trajectory represented by an arrow 7 '. The trajectories, according to some embodiments, allow the dosing devices to be moved individually or both simultaneously to the sides of the nip rolls (positions 6.1, 7.1 of the application bars shown in phantom) and to lift the nip rolls 4/12 Austrian Patent Office AT510 652 B1 2014-02- 15, for example, for change and maintenance purposes, without the movement devices 8, 8 'or the application bar 6, 7 must be removed. Hereinafter, for the sake of clarity, mainly only the first moving devices will be described.

The movement devices 8 arranged on the first application bar 6 comprise guides 9 at the ends of the application bar. The guide 9 is preferably mounted on the outside at the end of the first nip roller 2.

Preferably, the guide on the same body as the mounting of the first nip roll 2 is mounted so that during a possible movement of the first nip roll, the distance between the first application bar 6 and the first nip roll remains the same. The first nip roll 2 may be fixedly disposed and the second nip roll 2 'may be movably attached to the first nip roll for opening and closing the nip N between the nip rolls. The guides of the second application devices 7 arranged for the second movement devices 8 'are preferably attached to the same body as the storage of the second nip roll 2', so that when moving the second nip roll, the distance between the second application bar and the second nip roll remains the same.

On the guide is a guide surface 10 and guide surfaces are arranged, which preferably form a trajectory in the form of a circular arc for stop members to be arranged 11,12, which move along the guide surface 10. The guide 9 may be formed from a plate on which a groove in the form of a circular arc is formed as a guide surface 10. At the application bar 6, a first disc 11 and a second disc 12 are attached as a stop member 10 of the guide, which may be on the guide along sliding or rolling stop members. The first disc 11 is attached to the application bar 6 with a first arm 13 and the second disc is attached to the application bar 6 with a second arm 14. In order to enable movement of the application bar 6 along the guide, a motor can be arranged as an actuator. The motor can be an electric servomotor for stepless control of the position of the application bar. The setting of the position of the application bar can be done stepwise, for example with a limit switch.

A drive pulley 15, for example a gearwheel, can be driven directly or indirectly by a motor. With the drive disk 15, a transmission to the guide 9 is formed. A preferred way to form a slip-free transmission on the guide 9 is to equip the guide 9 with a ring gear 16 and to drive with a motor to be fitted to the teeth of the ring gear toothed drive plate 15 which is mounted on the application bar 6. The motor may be mounted on the application beam 6 when, for example, a toothed belt or chain transmission 17 is formed between the drive pulley 15 and the motor, which can be moved by a motor to be driven on a pulley 18. The ring gear 16 is preferably arranged on the inside of the guide 10, whereby in the arrangement shown in Fig. 1 for the application beam 6 supporting stop members 11, 12 with the drive pulley 15, a third support point can be formed, with a game of a guide mechanism for the movement device 8 can be reduced.

In the figures 1 to 4 preferred embodiments of the application bars are shown, in which the application bar is equipped either with spray nozzles 3 for spraying the treatment agent or with supply pipes 4 for forming a sump 5. The sump 5 may be formed with the feed tubes 4 by spraying the treating agent onto the roll, into the sump or directly onto the fibrous web. In some cases, the sump may also be formed with spray nozzles by spraying the treating agent onto the roll. For spraying the amount of glue required by the sump 5 nozzles or conventional similar distribution pipes can be used. To balance the profile, the feed ends of the feed tube can be narrowed to increase the supply pressure. If the sump 5 is metered by a roll surface, a roll having a good surface heat conductivity can be used to equalize the profile on the marsh side as a nip roll, for example a roll with a steel surface. In this way, the problems caused by hardness variations of a rubber coating at different temperatures can be avoided. For the desired Oberflächenleimungsvorgang suitable metering devices for spraying and / or a Sumpfleimung can be changed on the application bar. Naturally, there are such applications for surface sizing and embodiments for an integrated spray and sump sizing unit, in which both spray nozzles and sump press press supply pipes are present on the application beam at the same time. There are also such applications for surface sizing and embodiments for a plant in which both spray nozzles and feed pipes for squeegee pressing can be used simultaneously on the application bar. In FIGS. 2 to 4, for the sake of clarity, no moving devices 8, 8 'have been shown with which the application bars have been moved to different positions around the nip rolls 2, 2'.

Fig. 1 illustrates a spray and Sumpfschleimungsanlage for a fiber web, with the one side of the fiber web 1 glue from spray nozzles 3 is sprayed, which are arranged on two application bars 6, 7. Both application bars are also used as spray bars. On both spray bars the surfaces located against the fiber web on the spray bar and against the nip roll, the fiber web and the surface of the nip roll form a spray chamber therebetween.

In Fig. 1, the various functional treatment positions for the application bars 6, 7 and the guide roller 20 are shown in broken lines, which are possible in a combined spray and Sumpfleimpressanlage for the different angles of the fiber web 1 to the press nip N.

Fig. 2 shows the spray and Sumpfleimpressanlage of Fig. 1, in which the first application bar 6 with spray nozzles 3 for a first side of the fiber web 1 and the second application bar 7 with feed tubes 4 for the on the second side of the fiber web arranged sump 5 is equipped. In this embodiment, the angle of attack of the fiber web 1 in comparison to FIG. 1 is adjusted vertically. The first application bar 6 to be used as a spray bar was moved back out of the nip N with the movement system along the circular path of movement 6 ', whereby the injection chamber on the first application bar 6 remains tight against the first nip roll. The spray chamber is preferably closed by moving the first application bar forward toward the fiber web 1, the fiber web being brought into a vertical position with the aid of the guide roller 20. The second application bar 7 was moved back with the movement system from the nip N along the circular path of movement 7 '. With the supply pipes 4 of the second application beam 7, the treatment agent sump 5 was supplied between the second side of the fiber web and the second nip roll. Compared to surface sizing by two-sided spraying, one-sided sump sizing can, in some cases, reduce a drop in size and increase the amount of glue to be applied and penetration. Thus, at least in part, the speed and other benefits that result from metering the treating agent by spraying can be maintained.

Fig. 3 shows a spray and Sumpfleimpressanlage of Fig. 1, in which above the press nip N on both sides of the fibrous web, a sump 5 is formed. The first application bar 6 is equipped with feed tubes 4 for the sump 5 to be arranged on the first side of the fiber web, and the second application bar 7 is equipped with second feed tubes 4 for the sump 5 to be arranged on the second side of the fiber web. The first and the second application beams 6, 7 were moved back with the movement systems from the nip N along the circular movement paths 6 ', 7'.

Fig. 4 shows the spray and Sumpfleimpressanlage of Fig. 1, in which the first application bar 6 with feed tubes 4 arranged on the first side of the fiber web sump 5 and the second application bar 7 with spray nozzles 3 for the second page the fiber web 1 is equipped. In this embodiment of a two-sided sump sizing, with the different sides of the fibrous web being treated inversely with respect to FIG. 2, the angle of attack of the fibrous web 1 is inclined in comparison to FIG. The second application bar 7 to be used as a spray bar was moved back with the movement system out of the nip N along the circular movement path 7 ', whereby the injection chamber on the second application bar 7 remains tight against the second nip roll. The spray chamber is preferably closed by moving the second application bar forward toward the fiber web 1, wherein the fiber web was brought by means of the guide roller 20 in an inclined position. The first application bar 6 was moved back with the movement system from the nip N along the circular path of movement 6 '. With the supply pipes 4 of the first application bar 6, the treatment agent sump 5 was supplied between the first side of the fiber web and the first nip roll.

In the above description, lifting of the rollers is shown without disengaging the moving devices. However, lifting the pressing member without disengaging the moving devices is not the most appropriate solution in all cases. According to some preferred embodiments, a part of the bent guide moves with the pressing member, such as a roller, when the pressing member is lifted off. In some preferred embodiments, the guide is partially interrupted. For example, the part of the guide which defines the end of the trajectory for the metering device on the side of the press nip may be designed to move with the roller when the roller is lifted away. By way of example, a corresponding part of the toothing belonging to the movement device can follow with the guide part which moves with the pressing member. When lifting the pressing member, the metering device is preferably positioned at the beginning of the movement path. The guide which fixes the beginning of the movement path for the metering device can be inclined outwardly away from the pressing member in order to obtain an additional space for the upward lifting of the pressing member. By tilting the guide, the metering device can be offset in the lateral direction at a sufficient distance from the surface of the pressing member to be lifted. With the curved guide interrupted in parts, a space-saving interchanging position of the metering member for the metering device can be achieved, such as a combination bar which can be used as a spray bar and / or as a feed bar for a sump application and / or as a feed bar for a film transfer application.

In the above description, nip rolls are shown as press members for the press nip, but other alternatives may be used as press members for the press, for example, a belt may be arranged as a press member. Preferably, the belt is supported on the inside by a Riemenleitwalze. Thus, the press nip may be formed between a first pressing member, which may be a roller or a belt, and a second pressing member, which may be a roller or a belt. Thus, several alternative pressing member pairs forming the press nip may be present (first and second press members in order): roll / roller, roller / belt, belt / roller and belt / belt.

In a metering more than two metering devices may be present, which are movably arranged along the movement path (6 ', 7'), which follows the surface of the pressing member (2, 2 '). As a result, for example, the change of a metering combination of a device to be used as a combination metering device can be accelerated without having to make any changes to a single application bar. For one type of application per side of the fiber web a separate application bar can be used.

The movement of the metering device along the movement path (6 ', 7'), which follows the surface of the pressing member (2, 2 '), leads to a explained in connection with Figures 1 to 4 trajectory in the form of a circular arc, when the pressing member is a roller. The movement of the metering device, following the surface of the roller and along a trajectory in the form of a circular arc, occurs in some preferred embodiments of the plant. If the pressing member is a belt, the trajectory for the metering 7/12 Austrian Patent Office AT510 652B1 2014-02-15 follows

Device preferably the surface of the belt (which is supported for example on the inside of the Riemenleitwalze). In this way, the movement path for the metering device can be formed, for example, by a part of the circular arc and a part of a straight part of the belt.

In the above description, the embodiments of the invention have been described by using as an example of the applications of the invention mainly the sizing of the fibrous web and the spray and / or Sumpfleimpressanlage. It is not intended to limit the invention only to the treatment agents and modes of administration illustrated in these examples. The invention can also be applied in a spray and / or sump press, with which instead of glue or also other treatment agents are metered as glue. The invention may also be used in conjunction with other typical fiber web treating agents, for example, pigments and paints. The invention may also be used in connection with a film transfer.

The treatment agent in the system may be arranged to be supplied to the surface of the first pressing member 2 and / or the second pressing member 2 'for forming a treating agent film on the surface of the pressing member, wherein the treating agent film passes through the surface of the pressing member in the press nip ,

The description presented above provides non-limiting examples of some embodiments of the invention. It will be understood by those skilled in the art that the invention is not limited to the details shown, but that the invention may be practiced otherwise. Some features of the illustrated embodiments may be used without the use of other features.

The description presented above, as such, is to be considered as illustrative of the principle of the invention and not as limiting the invention. Thus, the scope of the invention is limited to the appended claims. 8/12

Claims (18)

Austrian Patent Office AT510 652B1 (Appl Treating agent on a second side of the fibrous web and a press nip (N) formed between two pressing members (2, 2 ') between them and through which the fibrous web passes after application of the treating agent, characterized in that the apparatus comprises a moving device ( 8, 8 ') for moving at least one dosing device (6, 7) along a movement path (6', 7 ') which follows the surface of the pressing member (2, 2'). 2. Installation according to claim 1, characterized in that the movement device (8, 8 ') between a fixing body of the pressing member and the metering device is arranged and a guide (9) and stop members (11, 12) which are arranged to themselves along the guide on a movement path (6 ', 7') to move, which follows the surface of the pressing member (2, 2 '). 3. Plant according to claim 2, characterized in that the movement path (6 ', 7') has the shape of a circular arc. 4. Installation according to one of claims 1 to 3, characterized in that the movement device (8, 8 ') comprises a guide (9) which is attached to the fastening body for the pressing member, and the moving device (8, 8') stop members ( 11, 12) attached to the metering device (6, 7) and arranged to move along the guide on a path of movement (6 ', T) following the surface of the pressing member (2, 2'). 5. Installation according to one of claims 1 to 4, characterized in that the movement device (8, 8 ') on the one hand at the end of the metering device (6, 7) and on the other hand on the outside at the end of the pressing member (2, 2') is mounted , 6. Installation according to one of claims 1 to 5, characterized in that the movement device (8, 8 ') comprises a plate-like guide (9) on which a groove as a guide surface (10) is formed, wherein the metering device stop members are attached gliding or rolling in the groove. 7. Installation according to one of claims 1 to 6, characterized in that the movement device (8, 8 ') has a guide (9) and attached to the guide ring gear (16) and on the metering device (6, 7) mounted drive pulley (15), which is driven by a motor, wherein the drive disk acts together with the toothing of the ring gear. 8. Installation according to one of claims 1 to 7, characterized in that the system arranged on the first metering spray nozzles (3) for spraying the treatment agent on the first surface of the fiber web and / or feed pipes (4) for forming a sump (5). between the first pressing member (2) and the fibrous web (1). 9. Plant according to one of claims 1 to 8, characterized in that the system arranged on the second metering spray nozzles (3) for spraying 9/12 Austrian Patent Office AT510 652 B1 2014-02-15 of the treatment agent on the second surface of the fiber web and or feed tubes (4) for forming a sump (5) between the second pressing member (2 ') and the fibrous web (1). 10. Installation according to one of claims 8 or 9, characterized in that the supply pipes (4) for supplying the treatment agent over the surface of the pressing member in the sump (5) are arranged. 11. Plant according to one of claims 8 or 9, characterized in that the supply pipes (4) for supplying the treatment agent are arranged directly in the sump (5). 12. Plant according to one of claims 1 to 11, characterized in that the treatment agent in the system for supplying to the surface of the first pressing member (2) and / or the second pressing member (2 ') for forming a treating agent film on the surface of the pressing member is arranged, and the treatment agent film is arranged in the system by means of the surface of the pressing member to enter the press nip. 13. Installation according to one of claims 1 to 12, characterized in that in the system, the position of the metering device (6, 7) to the pressing member (2, 2 ') around and the angle of attack of the fiber web (1) are adjustable. 14. Plant according to one of claims 1 to 13, characterized in that the system is a spray and / or pond or marsh crushing plant. 15. Installation according to one of claims 1 to 14, characterized in that the nip angle of the system is a maximum of 30 degrees, more preferably 20 degrees. 16. Installation according to one of claims 1 to 15, characterized in that the pressing member is a nip roll or a belt. 17. Installation according to one of claims 1 to 16, characterized in that the first metering device (6), the first pressing member (2) and the fiber web are arranged to form a dense first injection chamber between them and / or the second metering device ( 7), the second pressing member (2 ') and the fibrous web are arranged to form a dense second injection chamber therebetween to effectively remove mist and reduce an air-mist mist volume to be sucked from the injection chamber. 18. A method for treating a fibrous web (1) in a system comprising a first metering device (6) for applying a treatment agent on a first side of the fibrous web and a second metering device (7) for applying a treatment agent on a second side of the fibrous web and a Press nip (N) formed by two pressing members (2, 2 ') between them and through which the fiber web is guided after application of the treatment agent, characterized in that the system comprises a movement device (8, 8'), with the at least one metering device (6, 7) is moved along a movement path (6 ', 7') which follows the surface of the pressing member (2, 2 '). For this 2 sheets drawings 10/12