EP1766131A2

EP1766131A2 - Method for the application of an application medium and method and machine for production of a fibre web

Info

Publication number: EP1766131A2
Application number: EP05766801A
Authority: EP
Inventors: Wilhelm Gansberger; Martin Vogt; Georg Bacovsky; Joachim Henssler; Daniel Kotzmaier; Robert Kling
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2004-07-12
Filing date: 2005-07-11
Publication date: 2007-03-28
Also published as: JP2008506048A; WO2006005738A3; US20080053634A1; WO2006005738A2

Abstract

The invention relates to a method for the production of a paper, cardboard, tissue or other fibre web (3) with a mass per unit area of less than 125 g/m2, in particular, less than 100 g/m2 and, more particularly, 80 g/m2, with use of a device (12, 13, 16), for the application of a fluid application medium, in particular, of starch, characterised in that an application medium of a liquid with a solids concentration, in particular, a starch solids concentration, of more than 15 %, in particular, more than 25 % and, most particularly, more than 30 %, is applied.

Description

Method for applying a coating medium and method and machine for producing a fibrous web

According to a first aspect, the invention relates to a method for producing a paper, board, tissue or other fibrous web having a basis weight of less than 125 g / m ² , in particular less than 100 g / m ² and very particularly less than 80 g / m ² , using a device for applying a fluid application medium, in particular starch.

DE 100 33 213 A1 describes a method and a device for applying a liquid to pasty medium, preferably starch, onto a material web, preferably of paper or cardboard, in particular corrugated board, on one or both sides. or on both sides with an order and then passes through a press nip. The method is carried out with a device in which an endless belt is guided over two support rollers, which substantially fully supports the material web, among other things even after the press nip.

WO 99/22067 discloses a method and a device for applying a pasty application medium to a moving material web, in which the material web is first formed in a twin-wire zone of a paper machine such that a liquid or pasty application medium is applied to the material web at least on one side by means of an application device is applied. In this case, after a pressing element in the press section, a further application device for the application of a liquid or pasty application medium to the material web is present. From WO 00/55423 a method and an apparatus for treating a paper or a board web in a press section are known. A first application device sprays a coating medium onto the web while passing it over a suction roll by means of a felt. A second application device sprays a coating medium onto the surface of a transfer belt, from which the application medium is subsequently transferred to the web. Both application devices are arranged in front of the first press nip.

However, this solution shows disadvantages, especially at high speeds and low areal mass, especially at high speeds and low areal mass. The disadvantage is that with low surface-related mass, the (dyed) starch can penetrate through the paper web and thus passes into the felt and the press water.

In addition, at low, nowadays usual Stärkefeststoff¬ concentrations that are between 6 and 15%, only inadequate dry contents are achieved after the press section. The paper web displaced with the starch and the fluid in which the starch is dissolved tends to adhere or to deposit on a subsequent means for contact drying, for example on a cylinder or on a drying wire. This is especially true at high basis weights, if a lot of strength must be applied. In addition, conditioning of the contact medium, i. tape or roller, necessary.

At high basis weights of the paper web and high speeds, full penetration of the fibrous web with starch can not be achieved unless one side of a lot of starch is applied. Two-sided application in the former area and / or in the press section is less efficient because at least part of a job is flushed out by the dewatering process. In a double-felted press section, this happens on both sides, in the case of the use of a felt and a transfer belt on one side. Overall, when applying a coating medium there are the problems that the order quantity, in particular the orderable strength, and thus also the increase in strength achievable therewith is limited. The enrichment of a coating medium in the water cycle of the machine for producing the fibrous web leads to significant impairments in the production process, for example, slime, deposits, COD load (the COD value is a sum parameter for the organic load of a wastewater) and an odor burden.

At high speeds and at low basis weights, there are more breaks in the area of the application aggregates or after the application aggregates, which are caused by the considerable rewetting and the consequent drop in paper strength. Also, a considerable expenditure of drying energy in the after-dryer section is required.

It is the object of the invention to optimize the process for producing a fibrous web.

According to the invention, this object is achieved in a method of the type mentioned above in that a liquid having a solids concentration, in particular a starch solids concentration of more than 15%, in particular more than 25% and very particularly more than 30% is used as the application medium.

When using the above method in the press section of a machine for producing the fibrous web, wherein the fibrous web is conveyed through felts and transfer belts, this object is also achieved in that at least one of the felts or one of the transfer belts is conditioned by a liquid which is over a separate cycle is added and removed. The water enriched with (dyed) starch is not fed to the white water, but is fed back into the starch preparation process at a suitable point. With this measure, the loss of strength is minimized. The drying is carried out without contact; Preferably, only the surface of the paper or board web is dried in order to avoid deposits of the subsequent contact drying units. For this purpose, for example, a hot air drying is used.

Thus, the accumulation of starch in the white water cycle is avoided; This also prevents bacterial growth, slime formation and a change in the charge budget of the paper machine, which would lead to a negative influence on the formation of leaves, retention, drainage to increase the number of breaks and an increased demand for chemicals.

According to the invention, the press waters are separated into unloaded and polluted waters. The unloaded waters can be used according to the prior art, so for example, the white water circuit to be supplied.

On the other hand, the starch-loaded waters are preferably used so that the starch contained in these waters leads to a strength-increasing effect of the paper, or at a point in the water cycle where the problems described above can be avoided as much as possible.

For example, the white water can be monitored with an online zeta potential measurement to achieve retention and process stability.

The amount of starch-stressed press water can be reduced by applying the starch only at the end of the press section, preferably before the last nip. Potentially starch-laden water may be used to prepare the starch. An overflow of starchy water can be fed to the white water circuit. The starch content of the starchy water can be reduced before it is returned to the circulation. For example, the starch can be degraded enzymatically, such as by amylase in conjunction with an elevated temperature. Subsequently, the amylase can be destroyed again at temperatures of more than 110.degree. C., preferably of more than 120.degree. The starch can also be separated by ultrafiltration or nanofiltration or by reverse osmosis.

The application possibilities of press water consist of starch preparation, stock preparation, in the constant part of the machine, in the headbox and in the discharge.

By less slime formation and a smaller number of breaks, the runnability of the fibrous web is improved. The impurity burden is reduced by the invention. The chemical efficiency of the paper machine is increased. The starch-loaded press water is used specifically to increase strength.

By the invention, the process stability by avoiding contamination of process components and water and by a lower drop in the initial wet strength of the fibrous web due to a reduced liquid application by the fleet of the application medium, in particular the starch fleet, avoided and thus optimizes the efficiency of the order of the application medium ,

Advantageous developments of the method according to the invention will become apparent from the dependent claims 3 to 10, the description and the drawings.

In particular, a method proves to be advantageous in which the liquid in the processing process for the production of the application medium, in particular the starch-containing liquid, is recycled. It is advantageous if the application quantity of the application medium is between 2 and 8% of the basis weight of the finished paper or finished cardboard wound on the reel of a winding machine.

For a good penetration, a low viscosity of the starch liquor is necessary. This is determined by the starch temperature and by the starch pot. Thus, another advantageous method is that the temperature of the application medium after leaving the device by heating a transfer belt or felt or a roller to which the application medium is applied directly or indirectly, is increased. This makes it possible to ensure that the temperature of the carrier medium, d. H. the roller or the band corresponding to the starch fleet.

Advantageously, the application medium is applied directly or indirectly to the fibrous web immediately before a press nip, in particular before the last press nip, in the press section. When introducing the application medium, in particular the starch, before the last press nip, the amount of starch-laden press water can be significantly reduced.

A good quality of the order can be achieved when using native or uncooked starch or degraded, in particular oxidative or enzymatically degraded starch or cationic starch as a coating medium.

The concentration of the coating medium, especially the starch, can be chosen to be 15% or more.

Of advantage is a method, especially at high speeds, in which the application medium is applied on two sides after mechanical pressing on the fibrous web, wherein the Faserstoffbahπ has a Flächenπgewicht of more than 80 g / m ² . In this case, it is particularly advantageous if the first application of the application medium takes place in a press nip in the press section and the second application takes place on the opposite side of the fibrous web in the dryer section.

At basis weights of 80 g / m ² and more, especially at basis weights of more than 100 g / m ² and especially at basis weights of more than 125 g / m ² , it is proposed according to the invention to carry out a double-sided starch application with a time delay. In this case, the second application is carried out only from a degree of drying of the web of more than 45%, in particular of more than 50%, ie after mechanical pressing. As a result, no leaching of the applied starch takes place more.

The location for the first order is inventively arranged so that the drainage of the web is not against the order direction, but with the application direction, for example at the beginning of the dryer section or generally after the mechanical pressing. This means that, for example, on one side of the web an order takes place, while on the opposite side directly at or behind the application point water from the web, such as in the press nip, pushed out or sucked.

This arrangement is particularly advantageous at high speeds, such as greater than 800 m / min or greater than 1000 m / min, and at high basis weights.

The invention also relates in this first aspect to a machine, in particular for carrying out one of the methods described above.

According to the invention, the machine is characterized in that the press section comprises a plurality of guide rollers, over which the felts or Traπsferbänder are guided, and that at least one device for felt conditioning in front of the first außeπliegenden guide roller is arranged. As a result, a better runnability is achieved. Advantageous developments emerge from the subclaims 12 to 15.

It is advantageous if further devices for felt conditioning are employed at the first guide roller in the direction of circulation of the felt or of the transfer belt following guide rollers.

In this case, it can be advantageously provided that scrapers are used to clean the lateral surfaces of the rollers on rollers of the press section, in particular on the first guide roller and / or on further guide rollers.

It is also advantageous if at least one of the rollers, a device for spraying the lateral surface of the roller, in particular with conditioned water or with a chemical aid, in particular a surfactant, or a brush for cleaning the lateral surface is arranged.

It also proves to be advantageous if there is a device for collecting the application medium which has been cleaned off by the device and / or the brush and for returning it to a system for processing the application medium. According to the invention, the penetration of the starch is prevented; Lower water absorption results in a lower decrease in the strength of the fibrous web. Because of good penetration, the application medium has a high efficiency. The runnability of the fibrous web is improved. The application medium can also directly, d. H. without a transfer tape, are applied.

According to a second aspect, the invention further relates to a machine for producing a paper, board, or another fibrous web having a press section having a press roller forming two press nips in conjunction with a first and a second press roll and having at least one device arranged in the press section for applying a medium, in particular starch or glue, wherein the fibrous web is feasible together with a band through the press nips.

In the method and the device according to DE 100 33 213 A1, the starch is applied to applicator rollers according to an embodiment.

A disadvantage of this solution is that before the application unit no closed web guide is available. By free trains and as a result of in the

Press section still low strength of the fibrous web occur especially at low surface mass, for example, less than 125 g / cm ² , more breaks in the production process. There is also the risk of

Deposits of the applied material on one of the device for

Apply downstream aggregate for contact drying.

In WO 00/55423, press sections with central rollers are described in two embodiments (FIGS. 1 and 2) which form two press nips with press rollers.

The method known from WO 99/22067 and the device in question have already been referred to above.

In press sections known from the prior art, support by a transfer belt is necessary due to the low strength of the paper web. Thickness is applied to the side of the transfer belt because dewatering takes place in the nip away from the transfer belt. This ensures that the starch is moved by the movement of the liquid medium in the direction of the center of the fibrous web. The dosage of the starch on the opposite side of the transfer tape is not useful, because the medium is otherwise pressed into the next, coming into contact with the fibrous web felt.

Since the side of the paper web rests on the carrier tape on which the starch was applied, this side can not be dried even when using contactless dryers. As a result, on the first drying cylinders to expect heavy deposits on the dryer section following the press section.

Often one achieves too low a dry content even after the pressing process after passing through the press section. This increases the need for expensive thermal drying energy and the dryer section has to be longer. Due to a low initial wet strength, problems with the runnability of the fibrous web can be expected.

According to the second aspect, it is the object of the invention to provide a machine having a press section with the possibility of applying a liquid application medium, in particular starch or glue, and at the same time has a compact construction.

The object is achieved according to this second aspect of the invention by a machine for producing a paper, board, or another fibrous web having a press section with at least one press nip through which the fibrous web is feasible and at least one application device through which a liquid "medium in the press section on one side of the fibrous web can be applied, wherein the medium is applied by the applicator immediately before the press nip and / or in the press nip on the fibrous web.

According to this second aspect of the invention, a targeted drying of the fibrous web after the application of the medium is made possible. The dry content of the fibrous web after passing through the press section is higher than in the prior art. Due to the higher dry content of the fibrous web, the thermal drying energy can be reduced. This has the

The drying section has a shorter length and the production capacity of an existing paper machine is increased. Also a following

Starch aggregate can be omitted in this way; or it is sufficient to apply less starch, whereby the dry content drop after the Application unit is lower and the runnability of the fibrous web is improved.

By combining the pressing of the fibrous web and the application of a coating medium to a location a more compact compared to the prior art construction of the machine in the press section is created by the high reliability is guaranteed.

Advantageous developments of the invention are contained in the dependent claims 17 to 49, the description and the drawings.

According to a particularly preferred embodiment of the invention it is provided that the press section is designed such that the fibrous web in the press nip is only dewaterable on the side of the fibrous web, which is arranged opposite the side of the order of the medium on the fibrous web.

Accordingly, the coating direction or penetration direction of the medium into the fibrous web corresponds to the direction of drainage from the ^? Fibrous web.

As a result, the penetration of the introduced into the fibrous web liquid medium in the fibrous web is significantly improved because the dewatering of the fibrous web on the order side opposite side flooding of the registered medium from the fibrous web is prevented, as would be the case if the fibrous web on the side of the job would be drained. Rather, the penetration of the medium is enhanced by a "suction effect", so that the medium is absorbed in the dewatering in the fibrous web.

A concrete embodiment for implementing the above embodiment of the invention provides that the fibrous web on the side on this is drainable, is guided in contact with a press felt through the press nip. The press felt assumes the function of discharging water from the fibrous web during drainage. Furthermore, the application side of the medium of the fibrous web in the press nip in contact with a surface which is not suitable to receive water from the fibrous web.

According to a further embodiment of the invention it is provided that the press section has a press nip which is arranged below the press nip in the transport direction of the fibrous web and that a further application device is provided, through which a further liquid medium in the press section on the side of the fibrous web can be applied which is located opposite to the side of the first job. Thus, it is possible successively applied on both sides of the liquid medium on the fibrous web, but in each case at least the dewatering in the press nip before or in which the order of the medium must be such that application direction or penetration direction of the medium in the fibrous web of the dewatering direction from the fibrous web equivalent.

Furthermore, it can be provided that the press section has further press nips after the press nip in the transport direction of the fibrous web and is designed such that the fibrous web can be dewatered in at least some, preferably all, of the further press nips only on the side of the fibrous web which is the side of the fibrous web Order of the medium is disposed opposite to the fibrous web. As a result, further penetration of the applied medium into the fibrous web is further assisted by the press nips following the press nip of the job.

Analogous to the specific embodiment provides a specific embodiment of the above-mentioned embodiment that the fibrous web on the side on which it is dewaterable, in contact with a press felt by one of the other Pressnip feasible. In order to increase the dewatering performance and to increase the penetration of the liquid medium into the fibrous web, a further preferred embodiment of the invention that press nip is formed by a roller and a counter roll, the counter roll is besaugbar and with the dewaterable side of the fibrous web in Contact is bringable.

There are various ways to apply the liquid medium to the fibrous web. According to a preferred embodiment of the invention it is provided that the application device comprises a spraying device, through which the medium can be sprayed directly onto the fibrous web. In this embodiment, the medium is usually applied to the fibrous web before the press nip. It would also be possible to spray the medium in the press nip on the fibrous web.

According to a further preferred embodiment of the invention, it is provided that the applicator device comprises a roller which together with the counter-roller forms the press nip, in which the medium is transferred from the roller to the fibrous web. In this embodiment, the medium is applied by the waltz in the press nip on the fibrous web as it passes through the press nip.

There are different ways conceivable how the medium can be applied to the roller. According to a further embodiment of the invention, the application device comprises a spraying device, by means of which the medium can be transferred or sprayed onto the roller.

According to an alternative embodiment of the invention, the application device comprises a functional band, by means of which the medium can be transferred to the roller.

In a further preferred embodiment of the invention it is provided that the application device comprises a functional band, which by the Pressnip runs and thereby transfers the medium to the fibrous web. The fibrous web comes here with the functional band on which the medium is in the press nip in contact, whereby the medium is transferred from the functional band to the fibrous web.

According to a further embodiment of the invention, the fibrous web can be guided in contact with the functional belt in the transport direction by means of the press nip following the press nip. In other words, for example, the medium in the press nip is transferred from the functional band to the fibrous web and the fibrous web subsequently runs in contact with the functional band through the subsequent nip.

The press section preferably has a roller which is in contact with two counter rollers, the roller forming the press nip with one counter roller and the subsequent press nip with the other counter roller. Such a configuration is, for example, part of a known under the trade name "Duocentrinipkoflex press".

Next * is useful if the functional band is circling the roller. This is particularly advantageous if the press nip following the press nip of the medium is the last press nip of the press section. In this case, it is possible, for example, that the functional belt acts as a transfer belt between the press section and the dryer section.

In particular, when the functional band acts as a transfer belt between the press section and the dryer section, it makes sense if the functional band is permeable to air and / or transparent to radiation but not permeable to liquids. In this case, it is possible if between the press section and the dryer section a drying device is provided that the Faserstoffbahπ on both sides, ie on the resting on the Funktioπsbaπd and on the free side, for example. By air and / or radiation. In order to further increase the dry content after application of the medium in the press section and before the fibrous web enters the press section, a particularly preferred embodiment of the invention provides that in the transport direction of the fibrous web between the last press nip of the press section and the first drying cylinder of the dryer section Drying device, preferably for contactless drying, is provided.

Experiments have further shown that the dry content after application of the medium in the press section can be further increased if the temperature in the region of the press section, in particular in the region of the press nip, is higher than 40 ° C, preferably higher than 50 ° C, and up to 80 ° C.

A concrete embodiment of the above-mentioned possibility of pressing at elevated temperature is that the press felt on which the fibrous web can be guided through the press nip is preheated accordingly.

Furthermore, in the following press configurations, the dry contents can be further increased if:

The press section comprises only roll press nips and the sum of the line forces acting on the fibrous web during the passage through the press section is 300 kN / m or more, preferably 350 kN / m or more.

The press section comprises a shoe press nip and that the sum of the line forces acting on the fibrous web during passage through the press section is 700kN / m or more, preferably 1000kN / m or more. The press section comprises two shoe press nips and that the sum of the line forces acting on the fibrous web during the passage through the press section is 1700 kN / m or more, preferably 2000 kN / m or more.

The press section comprises three shoe press nips and that the sum of the line forces acting on the fibrous web during the passage through the press section is 2600 kN / m or more, preferably 3000 kN / m or more, particularly preferably 4000 kN / m.

Also, to increase the dry content in the press section, it makes sense if the fibrous web is feasible on a preheated press felt by at least one of the other press nips.

Furthermore, it makes sense to increase the dry content, if the functional band which transfers the medium to the fibrous web and which optionally further leads the fibrous web through the press nip and possibly further press nips can be preheated.

Also to increase the dry content in the? Fiber web in the press section, it makes sense if the fibrous web is preheated at the time of application of the medium.

Possibilities of preheating the fibrous web and / or one of the press felts and / or the functional band exist by means of steam, radiation, hot air preheatable.

If the medium to be applied is a starchy liquid medium, particularly good results with regard to dry content and stability of the fibrous web are achieved if the liquid medium has a starch concentration of at least 12%, preferably at least 20%, particularly preferably at least 30%. Furthermore, the invention relates to a method for producing a fibrous web in which the fibrous web is passed through a press nip a liquid medium on one side of the fibrous web is applied immediately before the press nip and / or in the press nip on the fibrous web.

Furthermore, a preferred embodiment of the method provides that the fibrous web is dewatered in the press nip only on the side of which is arranged opposite to the side of the order of the medium on the fibrous web.

In particular, any combinations of the two aspects of the invention are also advantageous.

The invention will be explained in more detail by means of exemplary embodiments. Here, the first aspect of the invention is described in particular with reference to Figures 1 to 7 and the second aspect of the invention, in particular with reference to Figures 8 to 15, but, as already mentioned, any combination of these two aspects of the invention are possible. Show it:

1 shows a press section with two press nips formed by different press cylinder pairs and with at least one device for applying a fluid application medium,

2 a, b two variants for the area after the second press nip from the press section of FIG. 1,

Fig. 3 shows a press section with a central roller and two devices for applying a fluid application medium, Fig. 4 shows a press section according to FIG. 3 with a single device for

5 shows a press section and a single-row dryer section, in each of which a device for application is arranged, FIG. Fig. 6 is a schematic representation of a press section with

Suction devices, over which contaminated with starch

Press water is discharged,

7 is a diagram for the utilization and treatment of the starch contaminated press water,

8 shows a press section with a central roller forming two press nips, in which an application to the fibrous web takes place before the press nip, while this is guided over a first press roller, FIG. 9 the press section according to FIG. 8, in which an application to a belt takes place, which discharges the order to the fibrous web, while this is guided over the first press roll, Fig. 10, the press section of FIG. 8, in which an order on the

Lateral surface of the central roller takes place

11 shows the press section according to FIG. 8, in which the order takes place on a belt which delivers the application to the central roller,

12 shows a press section with a central press roll forming two press nips in connection with a part of a dryer section, wherein an application takes place on a belt looping around the central roller, and FIG. 13 shows a press section in connection with a part of a dryer section, likewise applying an order the central roller looping around

Fig. 14 is a press section with two successively arranged

Shoe presses, and

Fig. 15 shows a press section with three successively arranged shoe presses.

A press section 1 (Figure 1) is formed by a tandem Nipcoflex press. From a screen belt of a twin-wire former 2, a fibrous web 3 is sucked by a pick-up roller 4 to a felt 5 and felt therefrom together with a second felt 6 through a first press nip 7, by means of further rollers 8 each equipped with a suction zone. 9 will be the Fiber web 3 first on a felt 10 and then transferred between this and another felt 11.

Before the fibrous web 3 comes into the area between the two felts 10, 11, it is sprayed through a device 12 for applying the application medium, in particular a liquid containing starch.

Also indirectly, the application medium is applied to the fibrous web 3. For this purpose, the application medium is applied in a device 13 to the already preheated by a drying and / or heating device 14 felt 11. Subsequently, the felt 11 is passed through a heater 15 mounted on both sides.

In the running direction of the felt 11, this is followed by a further application device 16 before the felt 11 is brought together with the fibrous web 3, so that the layer applied thereto by the devices 13, 16 is transferred to the fibrous web 3, which is subsequently passed through a second press nip 17 is passed.

On both felts 10, 11 as well as the felts 5, 6, regulators, tensioners and means for conditioning the felts may be arranged as the means 18, 19, 20. About scraper, the applied by the means 18, 19, 20 cleaning agent again be removed. The cleaning agent can also be scraped off indirectly from the shell of a roller, which can be arranged in each case in the immediate vicinity of the devices 18, 19, 20.

About further suction rollers 21, 22, the fibrous web 3 is on a transfer belt

23 passed through which it is forwarded by a single-row dryer section 24 with Trockeπzyliπderπ 25 and Umleπkwalzen 26. To the

Transfer belt 23 are Foilkästen or suction devices 27 employed. The Transfer from the press section 1 to the dryer section 24 takes place in a region 28.

In the region 28, the fibrous web 2 is guided either in the sandwich (FIG. 2 b), or the felt 10 (FIG. 2 a) is removed upward immediately after the press nip 17, so that the fibrous web 3 rests on the felt 11 only on one side , Between the press nip 17 and the roller 22 (Figure 2a) a drying device 29 is preferably arranged; Similarly, a drying device 30 is preferably mounted between the two rollers 21, 22 (FIG. 2b).

Another press section 31 (Figure 3) is formed by a DuoCentri Nipcoflex press. Also in the press section 31 of a screen belt of a twin-wire former 2, a fibrous web 32 is sucked by a pick-up roller 4 to a felt 5 and passed from this together with another felt 33 to a suction press roll 34 through a first press nip 35, which forms the suction press roll 34 together with a central roll 36.

To the central roller 36 is a second press nip 37 employed with this forming shoe press roll 38. To the shoe press roll 38, a felt 39 is guided around. The fibrous web 32 is passed in sandwich through the two press nips 35, 37, wherein it rests on the central roller 36 via a transfer belt 40.

An application device 41 for applying an application medium is set to the transfer belt 40. In order to temper the transfer belt 40, heating and drying devices 42, 43, 44 are present, which are on both sides of the

Transfer belt can be arranged. In addition to the applicator 41, from which the application medium is delivered via the transfer belt 40 to the fibrous web 32, a further application device 45 relative to the press suction roller 34 is present, the application medium directly to the fibrous web

32 applies. After the fibrous web 32 has passed through the two press nips 35, 37 and has been heated again by the drying device 44, it is transferred by means of a suction roll 46 to a felt or a transfer belt 47, with which it is passed together through a single-row dryer section 48.

All felts 5, 33, 39 and transfer belts 40 can be equipped on both sides with cleaning, tensioning and conditioning devices, as exemplified by means of conditioning devices 49, 50 on the felt 39. It is understood that each felt 5, 33, 39 and each transfer belt 40, a plurality of such devices may be arranged, if necessary. It is understood that devices for removing, in particular for doctoring, and for discharging the conditioning agent are provided.

As an alternative to the embodiment shown in FIG. 3, in a variant according to FIG. 4 the fibrous web 32 is felted only on one side around the central roll 36 and transferred from there by means of the suction roll 46 onto the transfer belt 47 to the dryer section 48. According to this embodiment, only the application device 45 is present as the sole ^ä 'applicator. However, it is also possible to arrange several application devices in this case.

After the suction roll 46, as in the embodiment shown in FIG. 3, foil boxes or suction devices 51 can be set against the fibrous web 32.

In a press section with a press nip 52 (FIG. 5) between a press roll 56 and a shoe press roll 57, an application medium is indirectly applied to the fibrous web 32 at a first application point by an application device 58 by spraying it onto the press roll 56. The application material passes within the press nip 52 on the fibrous web 32, while on the opposite side water from fibrous web 32nd is pressed out and is absorbed by a felt 59 which is passed together with the fibrous web 32 through the press nip 52.

To the felt 59 are also a clamping device 60, a controller 61, in particular for adjusting the angular position of the felt 59, and at least one conditioning device 62, in particular with respect to a guide roller arranged. From the felt 59, the moisture is removed again by a vacuum cleaner 63 and / or other suction devices.

The fibrous web 32 is passed after passing through the press nip 52 to a drying or heating device 64 to dry the application of the application medium on the upper side of the fibrous web 32.

Subsequently, the fibrous web 32 is sucked by a suction roller 65 from the felt 59 onto a transfer belt 66; from this, the fibrous web 32 is guided over drying cylinders 67 and deflecting rollers 68, designed as suction rolls, of a single-row drying section 69. On one of the deflection rollers 68, an application device 70 is arranged as a second application device for the application medium within the paper machine. The application device 70 comprises an application unit 71 which applies the application material to the smooth lateral surface of a transfer roller 72. From this, the application medium reaches the side of the fibrous web 32, which is opposite to the side, was first applied to the press nip 52 application medium. On the transfer roller 72, a cleaning device 73 is employed on the opposite side of the application unit, which cleans the surface of the transfer roller 72 of application material, which was not picked up by the fibrous web 32 in the nip between the transfer roller 72 and the guide roller 68. The sprayed off by the cleaning device 73, rinsed and / or wiped or abgerakelte application material is removed via a drainage channel 74. This form of application to the fibrous web 32 with two successively arranged application sites is particularly suitable for speeds of more than 800 m / min.

According to the invention, a separation of the waters produced in the press section is also provided, whether they are loaded with starch or not loaded. When a fibrous web 75 (FIG. 6) is passed through a press nip 76 between two press rolls in a press section, press water formed there is removed via suction devices 77, 78 and a line 79.

Likewise, starch-contaminated, conditioned by conditioning

Press water sucked by means of tube suckers 80, 81 and discharged via a line 82. Depending on the contamination, the press water in the lines 79, 82 can either be merged or treated separately.

In a paper machine 83 (FIG. 7), wastewaters to be discharged are formed in the wire section 84 and in the press section 85. The press water, which is subjected to a cleaning 86 in a unit 86, for example, as a dilution water the head box of the wire section 84 fed again. After or before the treatment unit 86, the press water or a part of the press water can be returned to a device 87 for the preparation of starch, so that the starch already contained in the press water can be fed again to the production process.

Also, a part of the treated press water is discharged from the unit 86 to stock processors 88 or to the constant portion 89 upstream of the paper machine 83 to serve as a dilution water. A part of the press water, which is either not needed because of the accumulating amounts of the press water or because it contains too much unwanted waste, is about a Removal unit 90 taken out of the production process and must be disposed of as wastewater.

A fibrous web 101 (FIG. 8), coming from a wire section 102, is guided through a press section 103. In this she will after passing through one

Press nip 169, which is formed by a roller 170 and a counter-roller, passed through two press nips 104, 105, of a roller 106 and the

Counter roll 107 and formed by the roller 106 and a counter-roller 108. The counter roll 107 is additionally equipped with a suction zone to suck the fibrous web 101 of a belt or felt 109 and to support especially the dewatering of the fibrous web 101.

While the fibrous web 101 wraps around the press roll 107, a medium is applied to a side 151 of the fibrous web 101 in the region of the shell of the press roll 107 by a device 110. The medium is either starch or glue. Preferably, steam is also sprayed to heat the fibrous web 101. The application of the medium takes place immediately before the press nip 104. Subsequently, the fibrous web 101 is guided through the first press nip 104 in order to firmly bond the application to it, while moisture is removed from the fibrous web 101 via a press felt 111. Here, the fibrous web 101 is dewatered in the press nip 104 only on the side 152 of the fibrous web 101, which is the side 151 of the order of the medium disposed on the fibrous web 101 opposite. Dewatering therefore takes place in such a way that the direction of dewatering of the moisture from the fibrous web 101 is equal to the direction of penetration of the medium into the fibrous web. In the press nip 105 following the press nip 104, the moisture is removed via a press felt 112. Here, the dewatering of the fibrous web is also such that the fibrous web 101 is dewatered only on the side 152 of the fibrous web 101, which is the side 151 of the order of the medium disposed on the fibrous web 101 opposite. This means that also in the press nip 105, the direction of drainage of moisture from the fibrous web 101 is equal to the direction of penetration of the medium in the fibrous web.

Similarly, in an alternative embodiment (FIG. 9), the fibrous web 101 is provided with an application in front of the first press nip 104. In this case, an applicator 113 comprises a spraying device 146 and a functional belt 114. The spraying device 146 transfers the medium, in particular starch or glue, to the functional belt 114. The functional belt

114 dispenses the application in a nip 115 formed by the functional belt 114 with the counter-roller 107 to the fibrous web 101 while it wraps around the jacket of the counter-roller 107.

For heating, a heating device 116, in particular for non-contact heating, can be arranged on the functional belt 114. Likewise, a conditioning device can also be provided on the functional band 114. In both arrangements shown in FIGS. 8 and 9, the application of the medium takes place against the counter-roller 107 designed as a suction roller.

In another embodiment of the invention (Fig. 10), an applicator 147 has a spraying device 117 and the roller 106. The spraying device 117 applies the medium to the outer surface of the roller 106, which forms the press nip 104 with the counter roller 107. The roller 106 discharges the medium in the press nip 104 onto the side 151 of the fibrous web 101.

In a similar manner, as illustrated in FIG. 9 by means of the functional band 114, in another embodiment of the invention (FIG. 11), an application is indirectly applied to the roller 106 by a spray device 118 of an application device 148 applying a job to a functional belt 119 which is transferred in a nip 120 to the roller 106, so that it is passed in the press nip 104 on the side 151 of the fibrous web 101. In all the embodiments shown in FIGS. 9 to 11, the dewatering takes place in the first press nip 104 and in the second press nip 105 such that the dewatering direction of the moisture from the fibrous web 101 is equal to the direction of penetration of the medium into the fibrous web.

Optionally, in the case of the press arrangements shown in FIGS. 8 to 11, the counter roll 108 is designed as a shoe press roll.

In another embodiment (FIG. 12), a fibrous web 122 coming from a wire section 121 is transferred via a lower felt 123 into a press section 124 with a roller 125. This forms two press nips 126, 127 with counter rolls 128, 129, of which the counter roll 128 is simultaneously formed as a suction roll.

The press section 124 has an application device 149 with which a medium is transferred to the side 151 of the fibrous web 122 in the press nip 126. For this purpose, an application, for example thickness, is applied to a functional strip 131 before the first press nip 126 via a spray device 130, which is permeable to air but not permeable to liquid. The ^• Function strip 131 passes, together with the fibrous web and a press felt 153 of the press nip 126. In the press nip 126, the medium is transferred and on the side 151 of the fibrous web 122 simultaneously drained by means of the press felt 153 opposite to the side 151 page 152, so that the dewatering direction from the fibrous web 122 is equal to the direction of penetration of the medium in the fibrous web. The functional band 131 wraps around the roller 125.

After passing through the press nip 126, the fibrous web 122 passes through the

Press nip 127. Again, a dewatering takes place such that the Eπtwässeruπgsrichtung from the Faserstoffbahπ 122 equal to the

Penetratioπsrichtung the medium in the fibrous web is. Also by the Press nip 127, the fibrous web 122 is guided in contact with the functional band 131. The press nip 127 is the last press nip of the press section 124.

Furthermore, the functional belt 131 acts as a transfer belt between the press section 124 and a dryer section 136.

After passing through the functional belt 131 through the press section 124, the functional belt 131 is heated together with the fibrous web 122 transported by it from both sides or at least from a single side, in particular from the upper side, by drying devices 132, 133 and dried. The upper drying device 132 generates hot air, while the lower drying device 133 is, for example, a radiation dryer. In addition, a further drying device 134 may be arranged on the fibrous web 122 in the subsequent region of a drying wire. In the event that the band 131 is impermeable to air, both drying devices 132, 134 are radiation dryers. However, the use of an air-permeable belt 131 has the advantage that it can be dried through it.

If the functional band 131 is impermeable to air, it is preferable to provide a demolition automatic with an optical or thermal sensor which recognizes the presence of the fibrous web 122 on the drying device 134 so that it is interrupted by a shutdown or

Pivoting can be disabled so that the drying device 134 does not heat the dryer fabric and damage it.

To the function band 131, a conditioning device 135 is employed.

For example, a cleaning agent is applied by spraying, which is then wiped off again.

The Fuπktionsbaπd 131 is applied by the device 130 applied application of the medium in the press nip 126 to the Faserstoffbahπ 122 while it wraps around the roller 125 together with the fibrous web 122. After passing through the press section 124, the fibrous web 122 is passed into a single-row drying section 136 with drying cylinders 137 and guide rollers 138 and vacuum sections 139 designed as suction rollers. In this, a negative pressure of preferably more than 5 kPa is used to allow a safe separation of the fibrous web 122 of the Trockenzylindem 137, since just the acted upon with the medium side of the fibrous web 122 rests on the shell side of the drying cylinder 137.

In a further exemplary embodiment (FIG. 13), the fibrous web 122 coming from a top wire from the wire section 121 is passed through two press nips 126, 127 formed by the roller 125 and the counter rollers 128, 129, the arrangement being compared to the embodiment according to FIG Fig. 12 illustrates inverted DuoCentri Nipcoflex press.

15

An air-impermeable belt 140 wraps around the roller 125. The press section

124 has an application device 150, which comprises a function band 140 and a spray device 141. The spray device sprays the medium

*** ^"the functional band 140. The functional belt 140 passes through the press nip 126 and

20 is in this the recorded medium to the side 151 of the fibrous web 122 from. Subsequently, the fibrous web 122 is forwarded via an air-permeable belt 142. On the belt 142 are on both sides contactless, for example, with radiant heat or hot air, working drying devices 143, 144 employed. Also on the tape 140 may be a

25 drying device 145 employed for non-contact drying.

In the embodiment shown in FIG. 13, too, dewatering takes place in the two press nips 126 and 127 such that the direction of dewatering from the fibrous web 122 is equal to the direction of penetration of the medium into the fibrous web 122. The embodiment according to FIG. 13 has the advantage over the embodiment variant shown in FIG. 12 that the band 142 may consist of a material which is not damaged or destroyed if no fibrous web 122 is guided over the band 142 and therefore the drying devices 143 , 144 heat the band 142.

14 shows a further embodiment of the invention, with a press section 155, which has two in the transport direction of a fibrous web successively arranged shoe press units 157 and 158.

The fibrous web 156 is sandwiched between an upper press felt 162 and a lower press felt 163 by the shoe press unit 157.

Thereafter, the fibrous web 156 is transferred to an upper press felt 161 and guided in a sandwich therebetween and a functional band 159 through the press nip 168 formed by a shoe press roll 166 and a counter roll 167. Here, the fibrous web is dewatered only on page 152.

In the region of the functional band 159 in the direction of the transport of the fibrous web 156 in front of the press nip 168, a liquid medium is conveyed by means of an application device

164 applied to the side 151 of the fibrous web 156. The

Application device 164 has a spray device 165 and the function band

159 on. In the present embodiment, the medium is applied to the

Function band 159 sprayed and transferred from the area of a roller 171 on the fibrous web 156 and then in the press nip 168 in the

Fiber web 156 registered.

The functional band 159 is impermeable to liquids, so that the fibrous web 156 in the press nip 168 is dewatered such that the direction of dewatering from the fibrous web 156 is equal to the direction of the medium's penetration into the fibrous web 156. After passing through the press nip 168, the fibrous web 156 is further transported on the functional belt 159 and transferred to a dryer section 160 at a roller 172.

FIG. 15 shows an embodiment of a press section with three shoe press units 175, 176 and 177 arranged behind one another in the transport direction of the fibrous web.

After passing through the shoe press unit 175, a liquid medium is applied to the side 151 of the fibrous web 156 before passing through the press nip 177 formed by the shoe press unit 176 by means of a functional band 179. The fibrous web 156 is guided in a sandwich between an upper press felt 178 and the liquid-impermeable functional band 179 through the press nip 177 and in this case dewatered only on the side 152.

After passing through the shoe press unit 176, the fibrous web 156 is guided onto an upper press felt 181 of the shoe press unit 177 and in sandwich between the upper press felt 181 and a liquid-impermeable belt 182 through the press nip 180 formed by the shoe press unit 177 and dewatered only on the side 152.

The fibrous web 156 is in this case dewatered in the press nips 180 and 177 such that the direction of dewatering from the fibrous web 156 is equal to the direction of penetration of the medium into the fibrous web 156.

There are also any combinations of the two, for example, with reference to the figures 1 to 7 on the one hand and the figures 8 to 15 on the other hand explained in more detail aspects of the invention possible. Bβzugszeichenliste

1 press section

2 twin wire formers

3 fibrous web

4 pick-up roller

5 felt

6 felt

7 press nip

8 roller

9 roller

10 felt

11 felt

12 order device

13 application device

14 drying and / or heating device

15 heating device

16 application device

17 Press nip

18 conditioning device

19 conditioning device

20 conditioning device

21 suction roll

22 suction roll

23 transfer belt

24 drying section

25 drying cylinders

26 Umleπkwalze

27 Foil box or suction device

28 transfer area 29 drying device

30 drying device

31 press section

32 fibrous web 33 felt

34 suction press roll

35 press nip

36 central roller

37 Pressnip 38 Shoe press roller

39 felt

40 transfer ribbon

41 application device

42 Heating and drying device 43 Heating and drying device

44 Heating and drying device

45 application device

46 suction roll

47 felt, transfer belt 48 drying section

51 Foil box or suction device

52 press nip

56 press roll

57 Shoe press roller 58 Application device

59 felt

60 clamping device

61 controls

62 Conditioning device 63 Pipe sucker

64 drying or heating device

65 suction roll 66 transfer ribbon

67 drying cylinders

68 deflecting roller

69 Drying section 70 Application device

71 Application unit

72 transfer roller

73 Cleaning device

74 gutter 75 fibrous web

76 press nip

77 suction device

78 Saugeiπrichtung

79 Line 80 Pipe Sucker

81 pipe suction

82 line

83 paper machine

84 wire section 85 press section

86 treatment unit

87 starch conditioning device

88 stock preparation devices

89 Constant part 90 Outfeed unit

101 fibrous web

102 wire section

103 press section

104 Pressnip 105 Press nip

106 roller

107 counter roll 108 counter roll

109 volume, felt

110 application device

111 press felt 112 press felt

113 application device

114 functional band

115 Nip

116 heating device 117 spraying device

118 spray device

119 functional band

120 Nip

121 wire section 122 fibrous web

123 underfelt

124 press section

125 roller

126 Press nip 127 Press nip

128 mating roll

129 mating roll

130 spray device

131 Function belt 132 Drying device

133 drying device

134 drying device

135 conditioning device

136 Drying section 137 Drying cylinder

138 guide roller

139 negative pressure range 140 functional band

141 spray device

142 breathable tape

143 drying device 144 drying device

145 drying device

146 spraying device

147 application device

148 application device 149 application device

150 application device

151 page

152 page

153 Press felt 154 Press felt

155 press section

156 fibrous web

157 shoe press unit

158 Shoe press unit 159 Function band

160 drying section

161 upper press felt

162 upper press felt

163 lower press felt 164 applicator

165 spray device

166 shoe press roll

167 mating roll

168 Press nick 169 Press nip

170 roller

171 role 172 roller

175 shoe press unit

176 shoe press unit

177 press nip 178 upper press felt

179 functional band

180 press nip

181 upper press felt

182 liquid-impermeable tape 183 applicator

184 roller

185 roller

Claims

claims

1. A method for producing a paper, board, tissue or another fibrous web (3, 32, 75) having a basis weight of less than 125 g / m ² , in particular less than 100 g / m ² and very particularly less as 80 g / m ² , using a device (12, 13, 16, 45) for applying a fluid application medium, in particular starch, characterized in that the application medium is a liquid having a solids concentration, in particular a starch solids concentration, of more than 15 %, in particular more than 25%, and in particular more than 30%.

2. A method for producing a paper, cardboard, tissue or another fibrous web (3, 32, 75), in particular according to claim 1, having a basis weight of less than 125 g / m ² , in particular less than 100 g / m ² and more particularly less than 80 g / m ² , using a

Device (12, 13, 16, 45) for applying a fluid application medium, in particular starch, in the press section of a machine for producing the fibrous web (3, 32, 75), wherein the fibrous web (3, 32, 52) over felts (3). 5, 6, 10, 11, 33, 39, 59) and transfer belts (47, 66), characterized in that at least one of the felts (5, 6, 10, 11, 33, 39, 59) or one of the felts Transfer belts (47, 66) is conditioned via a liquid, which is supplied to and removed via a separate circuit.

3. The method according to claim 2, characterized the liquid is recycled to the preparation process for producing the application medium, in particular the starch-containing liquid.

4. The method according to any one of claims 1 to 3, characterized in that the application amount of the application medium is between 2 and 8% of the basis weight of the wound on the drum of a winding machine finished paper or finished cartons.

5. The method according to any one of claims 1 to 4, characterized in that the temperature of the application medium after leaving the device by heating a transfer belt (11) or felt or a roller to which the application medium is applied directly or indirectly, is increased ,

6. The method according to any one of claims 1 to 5, characterized in that the application medium immediately before a press nip, in particular before the last press nip (17; 52), in the press section (1) directly or indirectly to the fibrous web (3, 32, 75) is applied.

7. The method according to any one of claims 1 to 6, characterized in that as a coating medium native or uncooked starch or degraded, in particular oxidative or enzymatically degraded starch or cationic starch is used.

8. The method according to any one of claims 1 to 7, characterized that the concentration of the coating medium, in particular the starch, is 15% or more.

9. The method according to any one of claims 1 to 8, characterized in that the application medium is applied on two sides after the mechanical pressing on the fibrous web (32), wherein the fibrous web (32) has a basis weight of more than 80 g / m ² .

10. The method according to claim 9, characterized in that the first application of the application medium takes place in a press nip (52) in the press section and that the second order takes place on the opposite side of the fibrous web (32) in the dryer section (69).

11. Machine, in particular for carrying out a method according to one of claims 3 to 10, characterized in that the press section (1, 31) comprises a plurality of guide rollers over which the felts or transfer belts are guided, and that at least one

Felt conditioning device (18) is arranged in front of the first outer guide roller.

12. Machine according to claim 11, characterized in that at the first guide roller in the circumferential direction of the felt or the transfer belt subsequent guide rollers further devices (49, 50) are employed for felt conditioning.

13. Machine according to claim 11 or 12, characterized in that rollers of the press section (1, 31), in particular on the first guide roller and / or on further guide rollers, scrapers are employed for cleaning the lateral surfaces of the rollers.

14. Machine according to one of claims 11 to 13, characterized in that at least one of the rollers means (73) for spraying the lateral surface of the roller (72), in particular with conditioned water or with a chemical aid, in particular a surfactant, or a brush for cleaning the lateral surface is arranged.

15. Machine according to claim 14, characterized in that a device for collecting the cleaned by the device and / or the brush application medium and for returning to a plant for the preparation of the application medium is present.

16. Machine for producing a paper, cardboard, or another fibrous web (101, 122, 156), in particular naeh one of claims 11 to 15, with a press section (103, 124, 155, 173) with at least one

Press nip (104, 126, 168, 177), through which the fibrous web (101, 122, 156) can be guided and with at least one application device (110, 113, 147, 148; 149, 150, 164, 183), through which liquid medium in the press section (103, 124, 155, 173) on one side (151) of the fibrous web (101, 122, 156) can be applied, characterized in that the medium by the application device (110, 113, 147, 148; 149, 150, 164, 183) immediately before the press nip (104, 126, 168, 177) and / or in the press nip (104, 126, 168, 177) on the fibrous web (101, 122, 156) can be applied.

17. Machine according to claim 16, characterized in that the press section (103, 124, 155, 173) is designed such that the fibrous web (101, 122, 156) in the press nip (104, 126, 168, 177) only on the Page (152) of the fibrous web (101, 122, 156) is drainable, the

Side (151) of the order of the medium on the fibrous web (101, 122, 156) is arranged opposite.

18. Machine according to claim 17, characterized in that the fibrous web (101, 122, 156) on the side (151) on which it is drainable, in contact with a press felt (111, 153, 161, 178) through the press nip ( 104, 126, 168, 177) is feasible.

19. Machine according to one of claims 16 to 18, characterized in that the press section has a press nip, which is arranged following the press nip in the transport direction of the fibrous web and that a further application device provided% t, through which a further liquid medium in the press section on the side of the fibrous web can be applied, which is arranged opposite to the side of the first order.

20. Machine according to one of claims 16 to 19, characterized in that the press section (103, 124, 155, 173) in the transport direction of the fibrous web (101, 122, 156) after the press nip (104, 126, 168, 177) further Press nips (105, 127, 180) and is designed such that the fibrous web (101, 122, 156) in at least some, preferably all, of the further press nips (105, 127, 180) only on the side (152) of

Fibrous web (101, 122, 156) is drainable, the side (151) of the Order of the medium on the fibrous web (101, 122, 156) is arranged opposite.

21. Machine according to claim 20, characterized in that the fibrous web (101, 122, 156) on the side (152) on which it is dewaterable, in contact with a press felt (112, 154, 181) by one of the further press nip ( 105, 127, 180) is feasible.

22. Machine according to one of claims 16 to 21, characterized in that press nip (104, 126) by a roller (106, 125) and a counter-roller (107, 128) is formed, wherein the counter-roller (107, 128) is aspirated and with the drainable side (152) of the fibrous web (101, 122, 156) is brought into contact.

Machine according to one of Claims 16 to 21, characterized in that the press nip (168, 176) is formed by a roller * (166, 184) and a counter-roller (167, 185), the roller (166, 184) forming a Shoe roll is.

24. Machine according to one of claims 16 to 23, characterized in that the application device (110, 113, 164, 183) comprises a spraying device (110, 165, 174) and / or a functional band (114, 159, 179) through which the medium is directly transferable to the fibrous web (101, 156).

25. Machine according to one of claims 16 to 24, characterized in that the application device (147, 148) comprises a roller (106) which together with the counter-roller (107) forms the press nip (104), in which the medium is transferred from the roller (106) to the fibrous web (101).

26. Machine according to claim 25, characterized in that the application device (147) comprises a spraying device (117) through which the medium on the roller (106) is transferable.

27. Machine according to claim 25, characterized in that the application device (148) comprises a functional band (119) through which the medium on the roller (106) is transferable.

28. Machine according to one of claims 16 to 23, characterized in that the application device (149, 150, 164, 83) comprises a functional band (131, 140, 159, 179), wherein the fibrous web (122, 156) in contact with the functional band (131, 140, 159, 179) through the press nip (126, 168, 177) is feasible.

29. Machine according to claim 28, characterized in that the medium is transmitted on passage through the press nip (126) on the fibrous web (122).

30. Machine according to claim 28, characterized in that the medium before being passed through the press nip (168, 177) is transferred to the fibrous web (122).

31. Machine according to claim 28, characterized in that the fibrous web (122) can be guided in contact with the functional belt (131, 140) in the transport direction by the press nip (127) following the press nip (126).

32. Machine according to one of claims 16 to 31, characterized in that the press section (103, 124) has a roller (106, 125) in contact with two counter-rollers (107, 108, 128, 129), wherein the roller ( 106, 125) forms the press nip (104, 126) with a counter roll (107, 128) and the subsequent press nip (105, 127) with the other counter roll (108, 129).

33. Machine according to claim 32, characterized in that the functional band (131, 140) wraps around the roller (125).

34. Machine according to one of claims 16 to 33, characterized in that the functional band (114, i19, 131, 140) is liquid-impermeable.

35. Machine according to claim 34, characterized in that the functional band (131) is permeable to air and / or permeable to radiation.

36. Machine according to one of claims 16 to 35, characterized in that the subsequent press nip (105, 127, 180) is the last press nip of the press section (103, 124, 173).

37. Machine according to one of claims 16 to 36, characterized the functional band (131, 140, 159) acts at least in sections as a transfer belt between the press section (124, 155) and a dryer section (136, 160).

38. Machine according to one of claims 16 to 37, characterized in that in the transport direction of the fibrous web (122) between the last press nip (127) of the press section (124) and the first drying cylinder (137) of the dryer section (136) a drying device (132 , 133, 143, 144), preferably for contactless drying, is provided.

39. Machine according to claims 16 to 38, characterized in that the temperature in the region of the press section (103, 124, 155, 173), in particular in the region of the press nips (104, 126, 168, 177), higher than 40 °

C is preferably higher than 50 ° C and up to 80 ° C.

40. The machine according to claims 16 to 39, characterized in that the press section (103, 124) comprises only roll press nips and that the sum of the 300 kN line forces acting on the fibrous web (101, 122) during passage through the press section (103, 124) / m or more, preferably 350kN / m or more.

41. Machine according to one of claims 16 to 39, characterized in that the press section (103, 124) comprises a shoe press nip and that the sum of the line forces acting through the press section (103, 124) on the fibrous web (101, 122) 700kN / m or more, preferably 1000kN / m or more.

42. Machine according to one of claims 16 to 39, characterized in that the press section (155) comprises two shoe press nips and that the sum of the line forces acting on the fibrous web (156) during passage through the press section (155) is 1700 kN / m or more, preferably 2000kN / m or more.

43. Machine according to one of claims 16 to 39, characterized in that the press section (173) comprises three Schuhpressspaite and that the

Sum of the line forces acting on the fibrous web (156) during the passage through the press section (173) is 2600 kN / m or more, preferably 3000 kN / m or more, particularly preferably 4000 kN / m.

44. Machine according to one of claims 16 to 43, characterized in that the press felt (111, 153, 161, 178) on which the fibrous web (101, 122, 156) through the press nip (104, 126, 168, 177) feasible is preheated.

45. Machine according to one of claims 16 to 44, characterized in that the fibrous web (101, 122, 156) on a preheated press felt

(112, 154, 181) by at least one of the further press nips (105, 127,

180) is feasible.

46. Machine according to one of claims 16 to 45, characterized in that the functional band (114, 119, 131, 140, 159, 179) is preheatable.

47. Machine according to one of claims 16 to 46, characterized that the fibrous web (101, 122, 156) is preheated at the time of application of the medium.

48. Machine according to one of claims 45 to 47, characterized in that the fibrous web (101, 122, 156) and / or one of the press felts (111, 112, 153, 154) and / or the functional band (114, 119, 131 , 140) by means of steam, radiation, hot air is preheated.

49. Machine according to one of claims 16 to 48, characterized in that on the fibrous web (101, 122, 156) can be applied liquid medium has a starch concentration of at least 12%, preferably at least 20%, more preferably of at least 30%.