WO2003008706A1

WO2003008706A1 - Method and device for producing a web of fibrous fabric provided with a three-dimensional structure

Info

Publication number: WO2003008706A1
Application number: PCT/EP2002/005809
Authority: WO
Inventors: Thomas Thoröe SCHERB; Jeffrey Herman; John Thomas
Original assignee: Voith Paper Patent Gmbh
Priority date: 2001-07-18
Filing date: 2002-05-27
Publication date: 2003-01-30
Also published as: DE10134906A1; EP1407074A1

Abstract

The invention relates to a method for producing a web of fibrous fabric provided with a three-dimensional structure, especially tissue, preferably towelling tissue or a web of hygiene fabric. The web of fibrous fabric is compressed on a structured embossing band and then pre-embossed, being subsequently guided together with the embossing band to a first drying cylinder in order to dry the three-dimensional surface structure obtained by means of the pre-embossing and is transferred from the embossing band onto a second drying cylinder, whereby the web of fibrous fabric remains in contact with the embossing band from the pre-embossing area to the moment when it is transferred to the second drying cylinder and the three-dimensional surface structure obtained by pre-embossing is fixed to the first and/or second dry cylinder. The invention also relates to a corresponding device.

Description

Method and device for producing a fibrous web provided with a three-dimensional structure

The invention relates to a method and a device for producing a fibrous web provided with a three-dimensional surface structure, in particular tissue, preferably towel-tissue, or hygiene web.

The embossing of a three-dimensional structure into the surface of a paper web, in particular a tissue web, in particular of hand tissue, is known (see for example WO 99/47749, WO 01/18307). It is also known that very good paper quality can be achieved by so-called through-air drying (TAD). The disadvantage, however, is that the use of TAD dryers is very complex and correspondingly expensive.

In a machine for producing a tissue web known from US Pat. No. 6,210,528, the first Yankee cylinder is not wrapped in a sieve. This Yankee cylinder does not require a drying hood because the web is not structured but lies smooth on the hot surface of the Yankee cylinder. In addition, free train trains are planned, which runs counter to high runability. In a machine for producing a tissue web known from WO 01/00925, the web is pressed between a felt and a so-called texture fabric. The result is shown in Figure 1 of the drawing. Since the felt 10 has a certain hardness and rigidity, densified zones 16 are formed in the area of the humps 14 of the embossing or structure screen 12, and the web 18 is not pressed completely into the valleys, so that it does not completely adopt the structure of the embossing tape.

The aim of the invention is to provide an improved method and an improved device of the type mentioned, in which the disadvantages mentioned above are eliminated and with which, in particular, even without the use of a larger TAD drying device, a high quality of the in an economical and correspondingly inexpensive manner End product is achievable. A corresponding quality should be achieved in particular with regard to the water retention capacity, the water absorption speed, the volume (bulk) etc.

According to the invention, this object is achieved by a method for producing a fibrous web provided with a three-dimensional structure, in particular tissue, preferably towel-tissue, or hygiene web, in which the fibrous web is pressed onto a structured embossing tape and thereby embossed, then together with the embossing tape is passed around a first drying cylinder in order to dry the three-dimensional surface structure obtained by the pre-embossing, and is subsequently transferred from the embossing belt to a second drying cylinder, the fibrous web remaining in contact with the embossing belt from the pre-embossing area to the transfer to the second drying cylinder and the three-dimensional dimensional surface structure is fixed to the first and / or second drying cylinder.

Because of this configuration, in the relevant fibrous web, i.e. especially the relevant paper, tissue, preferably towel tissue, or hygiene web, produces a sustainable three-dimensional surface structure that remains in the web in the desired manner even after the drying process, i.e. for example in the paper. The use of a complex and correspondingly expensive TAD process is no longer necessary. Even without such a TAD drying device, it is now possible in particular to produce a sustainable surface structure, for example a tissue or hygiene web, after the forming area.

In contrast to the machine known from US Pat. No. 6,210,528, for example, the structured web runs with the embossed or structured belt around the first drying cylinder. The web is therefore only at a few contact points on the surface of this drying cylinder, which reduces the heat transfer. Therefore, an impingement hood is preferably provided to increase the drying. The air temperatures are preferably high.

An essential difference between the solution according to the invention and the method known from WO 01/00925 lies in particular in the combination of the structural embossing process with the drying process.

In contrast to the machine known from WO 01/00925, the fibrous web is preferably shaped by suction. This creates a tissue quality with a higher volume and correspondingly better usage properties, such as better permeability. In addition, the web density before the first drying section is more homogeneous, which makes drying more efficient both in terms of quality and quantity.

The sheet structure is advantageously fixed after the first drying section and before the second drying section by pressing against a smooth surface. This creates zones with higher density and correspondingly higher strength.

A Yankee cylinder is preferably used as the first and / or the second drying cylinder.

An embossing screen is preferably used as the structure or embossing tape (“imprinting fabric”, “structured fabric”).

According to a preferred embodiment, the fibrous web is pressed onto the embossing tape by means of a suction element arranged on the side of the embossing tape facing away from the fibrous web and is accordingly pre-embossed. In particular, a suction box can be used as the suction element.

A cylinder with a smooth, closed surface is preferably used as the first and / or as the second drying cylinder.

As already mentioned, a drying hood, in particular an impingement hood, is preferably assigned to the first and / or the second drying cylinder. A Yankee cylinder is preferably used as the first and / or as the second drying cylinder, to which a drying hood is assigned, the diameter of which is greater than or equal to 3 m, preferably greater than 3.5 m and in particular greater than 4 m, in order to achieve the necessary dry content, especially at higher speeds (e.g. v ≥ 1700 m / min).

The air temperature of the impingement flow is advantageously chosen to be greater than 200 ° C. and preferably greater than or equal to 230 ° C. at least on the first drying cylinder.

According to an advantageous practical embodiment of the method according to the invention, the dry content of the fibrous web after the first drying cylinder and before the transfer to the second drying cylinder is greater than or equal to 38%.

The fibrous web is preferably supported continuously from the wet part to a crepe scraper assigned to the second cylinder.

As already mentioned, a preferred embodiment of the method according to the invention results from the fact that the sheet structure is fixed after a first and before a second drying section by pressing the fibrous web against a smooth surface.

Advantageously, an embossing tape is used which is structured in such a way that this embossing tape has a smaller area portion of raised or closed zones compared to the area portion of recessed zones or holes, and accordingly a smaller area portion of the fibrous web is pressed. The smaller proportion of areas in raised or closed zones gives the web areas of high density for strength, while the larger proportion of areas in recessed zones or holes, which remains at least essentially unpressed, the desired water absorption capacity and the desired Provides volume, which was previously only achieved through a complex and expensive through-flow or TAD drying.

In this case, an embossing tape can advantageously be used in which the proportion of the area in raised or closed zones is in a range from approximately 20% to approximately 50% and preferably approximately 25%.

For example, an embossing tape can be used in which the raised zones and the recessed zones are separated by offsets, i.e. by crossing points from weft and warp threads, a sieve fabric. For example, an embossing membrane or the like can also be used, in which the raised and recessed zones result from the holes.

According to an expedient practical embodiment of the method according to the invention, a former with two circulating dewatering belts is used, which run together to form a material inlet gap and are guided over a forming element, such as in particular a forming roller, the fibrous web being transferred to the embossing belt by one of the two belts. In this case, the fibrous web is preferably transferred to the embossing tape by the inner band coming into contact with the forming element.

It is also advantageous if a fine-pored, soft covering, such as in particular a felt, a capillary felt, a capillary membrane and / or the like, is used as the belt which transfers the fibrous web.

A sieve can, for example, also be provided as the belt which transfers the fibrous web. In this case, the fibrous web, together with the belt transferring the web, is advantageously passed over at least one vacuumed surface, in particular a vacuum roll, a vacuumed shoe or the like before the transfer.

Due to the combination of the vacuumed surface or the vacuum created there with a fine-pored, soft covering, an optimal gain in dry matter results with minimal energy consumption. If a suitably fine-pored, soft covering is used, the capillary effect of the covering can be used in particular for the web drainage. This capillary action supports and promotes the negative pressure in question. The energy requirement is reduced accordingly.

In particular, a felt with a foamed layer can be used as the band transferring the fibrous web, which contributes to the dewatering of the fibrous web due to its capillary action (capillary fabric). The foam coating can in particular be selected so that pores in a range from approximately 3 to approximately 6 μm result. The air permeability of such a felt is very low. The natural capillary action is used to drain the web while it is in contact with the felt.

In certain cases it is advantageous if the embossing tape is also passed through the wet part. The fibrous web can in particular also be pre-embossed in the wet part. Alternatively or additionally, pre-embossing is also possible afterwards.

According to an expedient practical embodiment of the method according to the invention, a former with two revolving dies is again Watering tapes are used, which converge to form a material inlet gap and are guided over a forming element, such as in particular a forming roll, but one of the two tapes is formed by the embossing tape. The inner band coming into contact with the forming element is preferably formed by the embossed band.

According to a preferred practical embodiment of the method according to the invention, the band which is not formed by the embossing tape is formed by a dewatering sieve with zonally different sieve permeability, the dewatering sieve in question preferably being provided as an outer sieve. A corresponding design of the method is particularly advantageous in the production of towel tissue. The screen produces a fine structure which increases the water absorption rate and, in conjunction with the embossing according to the invention, brings about an increased water retention capacity.

It is also advantageous if the transfer of the fibrous web to the second drying cylinder takes place in the area of a press nip that is generated between the second drying cylinder and a counter element, the fibrous web guided through the press nip being in contact with the surface of the drying cylinder and with the other Side of the embossing tape. In particular, a press roller, a suction roller or a shoe press unit with a flexible band guided over a press shoe in the area of the press nip can be used as the counter element interacting with the drying cylinder. In particular, a shoe press roll provided with a flexible roll shell can be used as the shoe press unit. A lower suction deflecting roller, for example, can also be used as the counter element interacting with the drying cylinder.

According to an expedient embodiment of the method according to the invention, a preferably soft band, in particular felt, provided within the loop of the embossing band is guided through the press nip. In particular, a felt with a foamed layer can be used, which contributes to the dewatering of the fibrous web due to its capillary action. The foam coating can, for example, be selected again in such a way that pores in a range from approximately 3 to approximately 6 μm result.

The fibrous web is preferably pre-embossed at a dry content in the range from about 10 to about 30%.

It is also advantageous if the fibrous web has a dry content greater than or equal to 38% and preferably a dry content in the range from about 38% to about 50% before being transferred to the second drying cylinder.

According to a preferred practical embodiment of the method according to the invention, the fibrous web is creped in the region of the second drying cylinder and then wound up.

The device according to the invention for producing a fibrous web provided with a three-dimensional structure, in particular tissue, preferably towel-tissue, or hygiene web, is accordingly characterized in that the fibrous web is pressed onto a structured embossing tape and thereby embossed, then together with the embossing tape is guided around a first drying cylinder to the to dry the three-dimensional surface structure obtained by the pre-embossing, and then to transfer it from the embossing tape to a second drying cylinder, the fibrous web remaining in contact with the embossing tape from the pre-embossing area to the transfer to the second drying cylinder, and the three-dimensional surface structure obtained by the pre-embossing on first and / or second drying cylinder is fixed.

Preferred embodiments of the device according to the invention are specified in the subclaims.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawing; in this show:

FIG. 1 shows a schematic section through a press nip of a machine known from WO 01/00925, through which the fibrous web is passed between a felt and a structured or embossed belt,

FIG. 2 shows a schematic representation of a device according to the invention for producing a fibrous web provided with a three-dimensional structure, in which the fibrous web is transferred to the embossing belt through the inner belt of a former,

Figure 3 is a schematic representation of a further embodiment of the device according to the invention, in which the embossing tape is also passed through the wet part, and

FIG. 4 shows a schematic section through the embossing or

Pre-stamping area of the machine according to the invention. FIG. 2 shows a schematic representation of an exemplary embodiment of a device 20 according to the invention for producing a fibrous web 22 provided with a three-dimensional structure, which can in particular be a paper web, preferably a tissue, in particular towel tissue, or hygiene web ,

In this device 20, the fibrous web 22 is pressed onto a structured embossing tape 24 by means of at least one first pressure field I and is thereby pre-embossed. The fibrous web 22 is then guided together with the embossing tape 24 around a first drying cylinder 26 in order to dry the three-dimensional surface structure obtained by the pre-embossing.

Subsequently, the fibrous web is transferred from the embossing belt 24 to a second drying cylinder 28, which can also be a Yankee cylinder in particular. In this area, the fibrous web 22 is exposed to a second pressure field II, by means of which the structure and the strength are fixed.

As can be seen from FIG. 2, the fibrous web 22 remains in contact with the embossing belt 24 from the pre-embossing area I until it is transferred to the second drying cylinder 28.

An embossing screen can in particular be provided as the embossing belt 24.

The fibrous web 22 can be pressed onto the embossing belt 24, for example, by means of a suction element 30 arranged on the side of the embossing belt 24 facing away from the fibrous web 22 and accordingly embossed. The first pressure field I is in the present case generated for example by the suction element 30. In particular, a suction box can be provided as the suction element 30.

The two drying cylinders 26, 28 preferably each have a smooth, closed surface.

A drying hood 32 or 34, in particular an impingement hood, is preferably assigned to each of the two drying cylinders 26, 28. A Yankee cylinder is advantageously provided as the first and / or as the second drying cylinder 32 or 34, to which a drying hood is assigned, the diameter of which is greater than or equal to 3 m, preferably greater than 3.5 m and in particular greater than 4 m in order to achieve the necessary dryness, especially at higher speeds (e.g. v> 1700 m / min). The air temperature of the impingement flow is preferably selected to be greater than 200 ° C. and in particular greater than or equal to 230 ° C., at least on the first drying cylinder 26.

After the first drying cylinder 26 and before the transfer to the second drying cylinder 28, the dry content of the fibrous web 22 is preferably greater than or equal to 38%.

A crepe scraper 37 is assigned to the second drying cylinder 28. Following the second drying cylinder 28, the creped fibrous web 22 is wound up by means of a corresponding winding device 36 (pope reeler).

As can be seen from FIG. 1, the fibrous web 22 is continuously supported from the wet part to the crepe scraper 37 assigned to the second drying cylinder 28. In the embodiment shown, the sheet structure is thus fixed after a first and before a second drying section by pressing the fibrous web 22 against a smooth surface.

The embossing tape 24 can in particular be structured in such a way that there is a smaller area portion of raised or closed zones compared to the area portion of recessed zones or holes, and accordingly a smaller area portion of the fibrous web 22 is pressed. For example, the proportion of areas in raised or closed zones can be in a range from 20% to approximately 50% and preferably approximately 25%.

The wet part comprises a former 38 with two circumferential drainage belts 40, 42, which converge to form a material inlet gap 44 and are guided over a forming element 46, such as, in particular, a forming roller. In this case, for example, a suction forming roll or a solid forming roll can be provided.

The pulp suspension is introduced into the stock inlet gap 44 formed between the outer band 40 and the inner band 42 by means of a headbox 48.

As can be seen from FIG. 1, the fibrous web 22 in the present exemplary embodiment is transferred to the embossing belt 24 by the inner belt 42.

The band 42 transferring the fibrous web 22 can be formed in particular by a fine-pored soft covering such as in particular a felt, a capillary felt, a capillary membrane and / or the like. Before the transfer to the embossing belt 24, the fibrous web 22 together with the inner belt 42 is guided over a vacuumed surface 50, which in the present case is formed by a suction roller 52. However, for example, a vacuumed shoe or the like can also be provided.

The band 42 which transfers the fibrous web 22 can in particular be formed by a felt with a foamed layer. The foam coating in question can be selected, for example, in such a way that pores result in a range from approximately 3 to approximately 6 μm.

A pickup or suction element 54 can be provided in the area of the web transfer point within the loop of the embossing belt 24, which is preferably provided here as an embossing screen.

Alternatively or additionally, pre-embossing can also take place in the transfer area. For this purpose, for example, a press, preferably a shoe press, can be provided in this area.

Between the suction element 30 and the first drying cylinder 26, the embossing belt 24 is guided around a lower deflection roller 56, which can also be designed as a suction roller, for example.

In the present case, the fiber web 22 is transferred to the second drying cylinder 28 in the region of a press nip 58 which is formed between the second drying cylinder 28 and a counter element 60. The fibrous web 22 guided through the press nip 58 is in contact with the surface of the drying cylinder 28. The other side of it lies against the embossing belt 24. That cooperates with the drying cylinder 28 The counter element 60 of this transfer press can be formed, for example, by a press roll, a suction press roll or a shoe press unit.

The fibrous web 22 is preferably pre-embossed at a dry content in the range from about 10 to about 30%. Before being transferred to the second drying cylinder 28, the fibrous web 22 expediently has a dry content greater than or equal to 38% and preferably a dry content in the range from about 38 to about 50%.

Figure 3 shows a schematic representation of another embodiment of the device 20 according to the invention, in which the embossing tape 24 is also guided through the wet part.

In the present case too, a former 38 is provided with an outer band 40 and an inner band, which in the present case is formed by the embossed band 24. The two belts 40, 24 converge again to form a stock inlet gap 44, which is fed with a stock suspension by means of a headbox 48. Following the forming element 46, the two belts 40, 24 are separated from one another, the fibrous web 12 together with the embossing belt 24 being fed past the suction element 30 and via the deflection roller 56 to the first drying cylinder 26 and then from the embossing belt 24 to the second drying cylinder 28 is passed.

In the area in which the embossing band 24 and the fibrous web 22 are separated from the outer band 40, a pickup or suction element 62 is provided within the loop of the embossing band 24, which is preferably embodied here as an embossing screen. This follows afterwards suction element 30 provided for pre-embossing, which in the present case is still in front of the deflection roller 56. In principle, however, another arrangement of this suction element 30 is also conceivable, for example behind the deflection roller 56, which also applies to the embodiment according to FIG. 2.

In the present case, the inner band of the former 38, which comes into contact with the forming element 46, is formed by the embossed band 24.

The outer band 40 of the former 38 can in particular be formed by a drainage sieve with zonally different sieve permeability.

In the present exemplary embodiment, the counter element 60 interacting with the drying cylinder 28 is formed by a shoe press unit, here a shoe press roller.

The counter element 60, which is arranged within the loop of the embossing belt 24 and is preferably formed by a shoe press roll, is wrapped in the present case by a preferably soft band 64 which is guided through the press nip 58 together with the embossing belt 24 and the fibrous web 22.

This particularly soft band 64 can be formed, for example, by a felt and preferably by a felt with a foamed layer. The foam coating in question can in particular be selected again in such a way that pores result in a range from approximately 3 to approximately 6 μm.

In this embodiment, the embossing tape 24 thus forms the inner sheet forming screen of the former 38. As can be seen from FIG. 3, the embossing tape 24, together with the fibrous web 22, is guided in front of the press nip 58 via a deflection roller 66, which is designed here, for example, as a suction roller.

Otherwise, this device can again be designed, for example, as the parts corresponding to FIG. 2. The same reference numerals are assigned to one another.

FIG. 4 shows a schematic section through the embossing or pre-embossing area I of the devices 20 according to the invention shown in FIGS. 2 and 3. Due to the pressure field I generated by the suction element 30, the fibrous web 22 is pressed onto the structured embossing tape 24 and thereby embossed. As can be seen from FIG. 4, the web is pressed completely into the valleys of the embossing tape 24, so that a pronounced structure results.

LIST OF REFERENCE NUMBERS

Felt structure sieve hump compacted zones fibrous web device fibrous web embossing band first drying cylinder, Yankee cylinder second drying cylinder, Yankee cylinder suction element drying hood, impingement hood drying hood, impingement hood winding device creping scraper former dewatering belt, outer belt dewatering belt, inner belt stock inlet nip suction pad forming element or head element Deflection roller press nip counter element pickup or suction element soft belt suction deflection roller

first print field, pre-stamp area second print field

Claims

Patent claims

1. A method for producing a fibrous web (22) provided with a three-dimensional structure, in particular tissue, preferably towel-tissue, or hygiene web, in which the fibrous web (22) is pressed onto a structured embossing tape (24) and thereby embossed, then is guided together with the embossing tape (24) around a first drying cylinder (26) in order to dry the three-dimensional surface structure obtained by the pre-embossing, and is subsequently transferred from the embossing tape (24) to a second drying cylinder (28), the The fibrous web (22) remains in contact with the embossing belt (24) from the pre-embossing area (I) to the transfer to the second drying cylinder (28) and fixes the three-dimensional surface structure obtained by the embossing to the first and / or second drying cylinder (26 or 28) becomes.

2. The method according to claim 1, characterized in that a Yankee cylinder is used as the first and / or the second drying cylinder (26, 28).

3. The method according to claim 1 or 2, characterized in that an embossing screen is used as the embossing tape (24).

4. The method according to any one of the preceding claims, characterized in that the fibrous web (22) by means of a suction element (30) arranged on the side of the embossing belt (24) facing away from the fibrous web (22) pressed onto the embossing belt (24) and correspondingly pre-embossed becomes.

5. The method according to claim 4, characterized in that a suction box is used as the suction element (30).

6. The method according to any one of the preceding claims, characterized in that a cylinder with a smooth, closed surface is used as the first and / or as the second drying cylinder (26, 28).

7. The method according to any one of the preceding claims, characterized in that a drying hood (32, 34), in particular an impingement hood, is assigned to the first and / or the second drying cylinder (26, 28).

8. The method according to any one of the preceding claims, characterized in that a Yankee cylinder is used as the first and / or as the second drying cylinder (26, 28), to which a drying hood is assigned, the diameter of which is greater than or equal to 3 m, preferably greater than 3.5 m and in particular greater than 4 m.

9. The method according to any one of the preceding claims, characterized in that the operating speed is selected to be greater than or equal to 1700 m / min.

10. The method according to any one of claims 7 to 9, characterized in that the air temperature of the impingement flow is selected to be greater than 200 ° C and preferably greater than or equal to 230 ° C at least on the first drying cylinder.

11. The method according to any one of the preceding claims, characterized in that the dryness of the fibrous web (22) after the first drying cylinder (26) and before transfer to the second drying cylinder (28) is greater than or equal to 38%.

12. The method according to any one of the preceding claims, characterized in that the fibrous web (22) is continuously supported starting from the wet part up to a creping doctor (37) assigned to the second drying cylinder (28).

13. The method according to any one of the preceding claims, characterized in that the sheet structure is fixed after a first and before a second drying section by pressing the fibrous web (22) against a smooth surface.

14. The method according to any one of the preceding claims, characterized in that an embossing tape (24) is used, which is structured so that for this embossing tape (24) there is a smaller area portion of raised or in comparison to the area share of recessed zones or holes results in closed zones and correspondingly a smaller area portion of the fibrous web (22) is pressed.

15. The method according to claim 14, characterized in that an embossing tape (24) is used in which the proportion of areas of raised or closed zones is in a range from approximately 20% to approximately 50% and preferably approximately 25%.

16. The method according to any one of the preceding claims, characterized in that a former (38) with two circulating drainage belts (40, 42) is used, which converge to form a material inlet gap (44) and via a forming element (46), in particular a forming roller are guided, the fibrous web (22) being transferred to the embossing belt (24) by one of the two belts (40, 42).

17. The method according to claim 16, characterized in that the fibrous web (22) is transferred to the embossing band (24) by the inner band coming into contact with the forming element (46).

18. The method as claimed in claim 16 or 17, characterized in that a fine-pore soft covering, such as in particular a felt, a capillary felt, a capillary membrane and / or the like, is used as the band (42) which transfers the fibrous web (22).

19. The method according to any one of the preceding claims, characterized in that a sieve is provided as the belt (42) transferring the fibrous web (22).

20. The method according to any one of the preceding claims, characterized in that the fibrous web (22) together with the belt (42) transferring the web (22) prior to transfer over at least one suction surface (50), in particular a suction roll (52 ), a vacuumed shoe or the like.

21. The method according to any one of the preceding claims, characterized in that a felt with a foamed layer is used as the band (42) transferring the fibrous web (22).

22. The method according to claim 21, characterized in that the foam coating is selected so that pores result in a range from about 3 to about 6 microns.

23. The method according to any one of the preceding claims, characterized in that the embossing tape (24) is also passed through the wet part.

24. The method according to claim 23, characterized in that the fibrous web (22) is pre-embossed in the wet part.

25. The method according to any one of the preceding claims, characterized in that a former (38) with two circulating drainage belts (40, 24) is used, which converge to form a material inlet gap (44) and via a forming element (46), such as in particular a forming roller are guided, one of the two bands (40, 24) being formed by the embossed band (24).

26. The method according to claim 25, characterized in that the inner band coming into contact with the forming element (46) is formed by the embossed band (24).

27. The method according to claim 25 or 26, characterized in that the band (40) not formed by the embossing band (24) is formed by a dewatering sieve with zonally different sieve permeability.

28. The method according to any one of the preceding claims, characterized in that the transfer of the fibrous web (22) to the second drying cylinder (28) takes place in the area of a press nip (58) which is generated between the second drying cylinder (28) and a counter element (60), the fibrous web (22) guided through the press nip (58) in contact with the surface of the drying cylinder (28) and lies with its other side against the embossing tape (24).

29. The method according to claim 28, characterized in that a press roller is used as the counter element (60) interacting with the drying cylinder (28).

30. The method according to claim 28, characterized in that a suction press roller is used as the counter element (60) interacting with the drying cylinder (28).

31. The method according to claim 28, characterized in that a shoe press unit is used as the counter element (60) interacting with the drying cylinder (28), which comprises a flexible band guided in the area of the press nip over a press shoe.

32. The method according to claim 31, characterized in that a shoe press roll provided with a flexible roll shell is used as the shoe press unit.

33. The method according to claim 28, characterized in that a lower suction deflecting roller is used as the counter element (60) interacting with the drying cylinder (28).

34. Method according to one of the preceding claims, characterized in that a preferably soft band (64), in particular felt, provided within the loop of the embossing band (24) is passed through the press nip (58).

35. The method according to claim 34, characterized in that a felt with a foamed layer within the loop of the

Embossing tape (24) is guided through the press nip (58).

36. The method according to claim 35, characterized in that the foam coating is selected such that pores result in a range from approximately 3 to approximately 6 μm.

37. Method according to one of the preceding claims, characterized in that the fibrous web (22) is pre-embossed at a dry content in the range from approximately 10 to approximately 30%.

38. The method according to any one of the preceding claims, characterized in that the fibrous web (22) before the transfer to the second drying cylinder (28) has a dry content greater than or equal to 38% and preferably has a dry content in the range of about 38 to about 50%.

39. Method according to one of the preceding claims, characterized in that the fibrous web (22) is creped in the region of the second drying cylinder (28) and then wound up.

40. Device (20) for producing a fibrous web (22) provided with a three-dimensional structure, in particular tissue, preferably towel-tissue or hygienic web, in which the fibrous web (22) is pressed onto a structured embossing tape (24) and thereby embossed is then passed together with the embossing tape (24) around a first drying cylinder (26) in order to dry the three-dimensional surface structure obtained by the pre-embossing, and is then transferred from the embossing tape (24) to a second drying cylinder (28) The fibrous web (22) remains in contact with the embossing belt (24) from the pre-embossing area (I) to the transfer to the second drying cylinder (28) and the three-dimensional surface structure obtained by the embossing on the first and / or second drying cylinder (26 or 28 ) is fixed.

41. Device according to claim 40, characterized in that a Yankee cylinder is provided as the first and / or as the second drying cylinder (26, 28).

42. Device according to claim 40 or 41, characterized in that an embossing screen is provided as the embossing band (24).

43. Device according to one of the preceding claims, characterized in that the fibrous web (22) is pressed onto the embossing band (24) by means of a suction element (30) arranged on the side of the embossing belt (24) facing away from the fibrous web (22) and is accordingly pre-embossed becomes.

44. Device according to claim 43, characterized in that a suction box is provided as the suction element (30).

45. Device according to one of the preceding claims, characterized in that a cylinder with a smooth, closed surface is provided as the first and / or as the second drying cylinder (26, 28).

46. Device according to one of the preceding claims, characterized in that a drying hood (32, 34), in particular an impingement hood, is assigned to the first and / or the second drying cylinder (26, 28).

47. Device according to one of the preceding claims, characterized in that that a Yankee cylinder is provided as the first and / or as the second drying cylinder (26, 28), to which a drying hood is assigned, the diameter of which is greater than or equal to 3 m, preferably greater than 3.5 m and in particular greater than 4 m ,

48. Device according to one of the preceding claims, characterized in that the operating speed is greater than or equal to 1700 m / min.

49. Apparatus according to claim 44, characterized in that the air temperature of the impingement flow is selected to be greater than 200 ° C and preferably greater than or equal to 230 ° C at least on the first drying cylinder (26).

50. Device according to one of the preceding claims, characterized in that the dryness of the fibrous web (22) after the first drying cylinder (26) and before transfer to the second drying cylinder (28) is greater than or equal to 38%.

51. Device according to one of the preceding claims, characterized in that the fibrous web (22) is continuously supported starting from the wet part up to a crepe scraper (37) assigned to the second drying cylinder (28).

52. Device according to one of the preceding claims, characterized in that the leaf structure after a first and before a second Drying section is fixed by pressing the fibrous web (22) against a smooth surface.

53. Device according to one of the preceding claims, characterized in that the embossing tape (24) is structured in such a way that this embossing tape (24) has a smaller area portion of raised or closed zones compared to the area portion of recessed zones or holes and accordingly a smaller area of the fibrous web (22) is pressed.

54. Device according to claim 53, characterized in that the area proportion of raised or closed zones is in a range from approximately 20% to approximately 50% and preferably approximately 25%.

55. Device according to one of the preceding claims, characterized in that a former (38) is provided with two peripheral drainage belts (40, 42) which converge to form a material inlet gap (44) and via a forming element (46), in particular a forming roll is guided, the fibrous web (22) being transferred to the embossing belt (24) by one of the two belts (40, 42).

56. Device according to claim 55, characterized in that the fibrous web (22) through the with the forming element (46) contacting inner band is transferred to the embossing band (24).

57. Device according to claim 55 or 56, characterized in that the band (42) transferring the fibrous web (22) is formed by a fine-pored, soft covering such as, in particular, a felt, a capillary felt, a capillary membrane and / or the like.

58. Apparatus according to claim 55, characterized in that the band (42) transferring the fibrous web (22) is formed by a sieve.

59. Device according to one of the preceding claims, characterized in that the fibrous web (22) together with the belt (42) transferring the web (22) prior to transfer over at least one suction surface (50), in particular a suction roll (52 ), a vacuumed shoe or the like.

60. Device according to one of the preceding claims, characterized in that the belt which transfers the fibrous web (22) is formed by a felt with a foamed layer.

61. Device according to claim 60, characterized in that the foam coating is selected such that pores result in a range from approximately 3 to approximately 6 μm.

62. Device according to one of the preceding claims, characterized in that the embossing tape (24) is also guided through the wet part.

63. Device according to claim 62, characterized in that the fibrous web (22) is pre-embossed in the wet part.

64. Device according to one of the preceding claims, characterized in that a former (38) is provided with two circulating drainage belts (40, 24) which converge to form a material inlet gap (44) and via a forming element (46) such as, in particular, a forming roller are guided, one of the two bands (40, 24) being formed by the embossed band (24).

65. Device according to claim 64, characterized in that the inner band coming into contact with the forming element (46) is formed by the embossed band (24).

66. Device according to claim 64 or 65, characterized in that the band (40) not formed by the embossing band (24) is formed by a dewatering sieve with zonally different sieve permeability.

67. Device according to one of the preceding claims, characterized in that that the transfer of the fibrous web (22) to the second drying cylinder (28) takes place in the area of a press nip (58) which is formed between the second drying cylinder (28) and a counter element (60), the one guided by the press nip (58) The fibrous web (22) is in contact with the surface of the drying cylinder (28) and is in contact with the other side of the embossing tape (24).

68. Device according to claim 67, characterized in that the counter element (60) interacting with the drying cylinder (28) is formed by a press roller.

69. Device according to claim 67, characterized in that the counter element (60) interacting with the drying cylinder (28) is formed by a suction press roll.

70. Apparatus according to claim 67, characterized in that the counter element (60) cooperating with the drying cylinder (28) is formed by a shoe press unit with a suction deflecting roller (66) which comprises a flexible band guided in the area of the press nip over a press shoe.

71. Device according to claim 70, characterized in that a shoe press roll provided with a flexible roll jacket is provided as the shoe press unit.

72. Device according to claim 67, characterized in that a lower suction deflecting roller is provided as the counter element (60) interacting with the drying cylinder (28).

73. Device according to one of the preceding claims, characterized in that a preferably soft band (64), in particular felt, provided within the loop of the embossing band (24) is guided through the press nip (58).

74. Device according to claim 73, characterized in that a felt with a foamed layer is guided inside the loop of the embossing tape (24) through the press nip (58).

75. The device according to claim 74, characterized in that the foam coating is selected such that pores result in a range from approximately 3 to approximately 6 μm.

76. Device according to one of the preceding claims, characterized in that the fibrous web (22) is pre-embossed at a dry content in the range from approximately 10 to approximately 30%.

77. Device according to one of the preceding claims, characterized in that that the fibrous web (22) has a dry content greater than or equal to 38% and preferably a dry content in the range from about 38 to about 50% before being transferred to the second drying cylinder (28).

78. Device according to one of the preceding claims, characterized in that the fibrous web (22) is creped in the region of the second drying cylinder (28) and means (36) are provided in order to subsequently wind up the fibrous web (22).