Machine and method for producing a fibrous web
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- ANDRITZ AG
- Filing Date
- 2024-07-03
- Publication Date
- 2026-06-17
Smart Images
Figure EP2024068687_13022025_PF_FP_ABST
Abstract
Description
[0001] MACHINE AND METHOD FOR PRODUCING A FIBROUS WEB
[0002] The invention relates to a method for producing a fibrous web, in particular a structured tissue paper web, comprising the steps:
[0003] - Forming the fibrous web from a fibrous suspension and transferring the fibrous web in a transfer area from a first forming fabric to a structural fabric
[0004] - guiding the fibrous web on the structural fabric from the transfer area over a dewatering roller, in particular a suction roller, and further through at least one drying area designed for through-air drying, wherein in a wrapping area of the dewatering roller, the fibrous web is guided between the structural fabric and a dewatering fabric, in particular a felt, over the dewatering roller and at least partially wraps around the dewatering roller, a suction zone of the dewatering roller is at least partially encompassed by the wrapping area, and the fibrous web is dewatered via the suction zone. The invention also relates to a machine for producing a fibrous web.
[0005] To produce a high-quality fibrous web, particularly a structured fibrous web, explicit mechanical dewatering by pressing the fibrous web is dispensed with. Those skilled in the art are familiar with through-air drying processes, in which the fibrous web is formed in a forming area, transferred to a structure fabric, and dried essentially by applying vacuum and thermal drying, particularly through-air drying. Fibrous webs produced in this way include structured, through-air dried tissue papers for use as kitchen towels, toilet paper, or similar. The high-quality fibrous web is characterized by a greater thickness and thus a larger volume, which—compared to fibrous webs produced conventionally by pressing—is accompanied by a much higher water absorption capacity, a much higher water absorption rate, and greater softness.
[0006] EP3359733A1 discloses a method for producing a fibrous web, in particular a tissue or hygiene paper web, wherein a pre-dewatering device is provided upstream of the TAD dryer. In particular, EP3359733A1 teaches that pre-dewatering must be carried out gently to avoid reducing the quality of the fibrous web, while pre-dewatering with presses would compress the fibrous web excessively and negatively impact the quality.
[0007] The aim of the invention is a method and a machine whereby a high-quality fibrous web can be produced particularly efficiently. In particular, the method should allow the production of a fibrous web of consistently high quality with reduced energy consumption, i.e., with a higher sheet thickness or volume, a higher water absorption capacity, a higher water absorption rate, and improved softness.
[0008] This is achieved according to the invention in that the wrapping area comprises a press nip formed between the dewatering roll and a counter roll, the fibrous web is mechanically dewatered in the press nip by pressing and the press nip is arranged in an outlet area of the suction zone or downstream of the suction zone, wherein upstream of the press nip in the wrapping area, a drying medium, in particular hot air and / or steam, is sucked from a drying hood through the fibrous web into the suction zone of the dewatering roll. The fibrous web is thus formed in a forming area - in particular by dewatering a fibrous suspension introduced from a headbox between the first and a second forming fabric. In the transfer area, the fibrous web is transferred from the first forming fabric to the structural fabric.A structured dryer fabric, and in particular a TAD (Through Air Drying) fabric, is suitable as a structural clothing. The transfer in the transfer area preferably takes place in such a way that the fibrous web is transferred from the faster rotating forming fabric to the slower rotating structural clothing, and the forming fabric preferably rotates more than 2% faster, particularly preferably more than 10% faster, than the structural clothing. The transfer from the faster rotating forming fabric to the slower rotating structural clothing has the advantage that the quality properties of the fibrous web are improved during the transfer, in particular the thickness and therefore the volume of the fibrous web and also the water absorption and / or
[0009] Water absorption rate and softness are achieved.
[0010] After the transfer section on the structural clothing, the fibrous web is guided over a dewatering roll, in particular a suction roll, and then through a drying section designed for through-air drying. The fibrous web can, for example, be wound up onto a reel after the drying section. In another embodiment of the process, after the drying section, the fibrous web is transferred from the structural clothing to a drying cylinder, in particular a Yankee cylinder, and dried. After drying and possible creping, i.e. the fibrous web is removed with a doctor blade directly from the surface of the drying cylinder, the fibrous web can be rolled up. Yankees are drying cylinders and are characterized by diameters greater than 3m, with the fibrous web being guided directly on the surface of the Yankee cylinder.Optionally, a drying hood can be assigned to the drying cylinder, with hot air and / or steam being directed through the drying hood directly against the fiber web guided on the drying cylinder. Such drying hoods are designed, for example, as impingement air drying hoods.
[0011] After the transfer zone and before the drying zone, the fibrous web is guided on the structural fabric over the dewatering roller, in particular a suction roller. The fibrous web at least partially wraps around the dewatering roller, with the fibrous web being guided through the wrapping zone of the dewatering roller, and in the wrapping zone, the fibrous web is guided between the structural fabric and the dewatering fabric, in particular a felt, over the dewatering roller. In particular, the dewatering fabric is guided between the fibrous web and the dewatering roller. The wrapping zone at least partially encompasses the suction zone of the dewatering roller, which allows the fibrous web to be dewatered by a vacuum applied to the suction zone. When using a felt, vacuum levels of 300 mbar - 500 mbar have proven particularly suitable.According to the invention, the wrapping area comprises a press nip formed between the dewatering roller and a counter roller, wherein the fibrous web is mechanically dewatered in the press nip by pressing and the press nip is arranged in an outlet area of the suction zone or after the suction zone. It is essential that upstream of the press nip, where "upstream" refers to the perspective of the moving fibrous web, in the wrapping area a drying medium, in particular hot air and / or steam, is sucked from a drying hood through the fibrous web into the suction zone of the dewatering roller and promotes the dewatering of the fibrous web. Surprisingly, it was found that when the fibrous web is guided between the structural fabric and the dewatering fabric around the dewatering roller as a result of the tension of the fabric guided on the outside, i.e., opposite the inside dewatering roller, i.e.the structural fabric, a dewatering pressure is exerted by the structural fabric onto the fibrous web, wherein water dewatered from the fibrous web is advantageously absorbed via the capillary-acting dewatering fabric, in particular a felt. The dewatering of the fibrous web is further improved by the suction of the inner fabric, i.e. the dewatering fabric adjacent to the dewatering roller, via the suction zone of the dewatering roller. A further improvement results from the guiding of the drying medium, in particular hot air and / or steam, from the drying hood onto the outer fabric, i.e. the structural fabric, for example a drying screen and in particular a TAD screen, which drying fabric has an advantageous porosity or air permeability. The inventive arrangement has a synergistic effect, i.e.With comparatively little effort (vacuum, drying medium, press nip), a significant increase in the dry content of the fibrous web before entering the drying area is achieved, while maintaining the quality parameters of the fibrous web. For example, an increase in the dry content of the fibrous web of up to 5%, i.e., from a dry content of 25% to a dry content of 30%, is achievable with a line load in the press nip of, for example, 50 kN / m, which means a reduction in the thermal drying effort in the drying area of up to 20%.Thus, the simultaneous execution of these process steps—guiding the fibrous web between the particularly capillary dewatering fabric and the permeable structural fabric, dewatering through the tension of the structural fabric, applying the drying medium through the permeable structural fabric, and applying a vacuum to the particularly capillary dewatering fabric—leads to a positive effect in the press nip. What is particularly surprising is that the fibrous web, "pre-dewatered" in this way before the press nip, can be guided through the press nip without any loss of quality, with the press nip being located in the wrap area between the dewatering roll and the counter roll.In the arrangement according to the invention, the fibrous web is protected in the press nip by the structure of the structural fabric. In particular, the "pre-dewatering" according to the invention ensures that the fibrous web has a sufficiently low moisture content or a sufficiently high dry content before the press nip. It was thus found that with appropriate "pre-dewatering" of the fibrous web before the press nip, the press nip has essentially no negative effect on the quality properties of the fibrous web. This beneficial effect was observed particularly for fibrous webs with a sheet weight between 14 and 35 gsm on the structural fabric.
[0012] In an advantageous embodiment of the process, mechanical dewatering by pressing the fibrous web occurs for the first time in the press nip between the transfer zone and the drying zone. With the initial mechanical dewatering by pressing the fibrous web in the press nip, mechanical dewatering occurs for the first time in the outlet area of the suction zone or after the suction zone, with the fibrous web previously guided around the dewatering roller in the wrap zone between the structural fabric and the dewatering fabric, dewatered via the suction zone of the dewatering roller and further through the drying medium of the drying hood. In particular, a press nip in the inlet area of the suction zone would have negative effects on the quality parameters of the fibrous web.
[0013] Particularly preferably, pressing is carried out with a linear load greater than 30 kN / m, preferably with a linear load greater than 40 kN / m, and particularly preferably with a linear load greater than 45 kN / m. This allows for significant dewatering through pressing. At lower linear loads, there is essentially no improvement in dry matter content, or no mechanical dewatering through pressing occurs.
[0014] In a further advantageous embodiment of the method, the mechanical dewatering takes place by pressing with a line load of at most 100 kN / m, preferably at most 80 kN / m and particularly preferably at most 55 kN / m. Advantageously, with increasing line load, increasing mechanical dewatering is achieved by pressing the fibrous web. To ensure that there is no negative impact on the quality parameters of the fibrous web, the line load is to be limited accordingly to at most 100 kN / m, preferably to at most 80 kN / m and particularly preferably to at most 55 kN / m. In an equally advantageous embodiment of the method, the fibrous web is dewatered via the suction zone for a period of time corresponding to the length of the suction zone of at least 0.8 m, preferably at least 1.3 m and particularly preferably at least 1.7 m.It was recognized that advantageous dewatering via the suction zone is achieved with a corresponding residence time of the fibrous web above the suction zone, wherein such a residence time corresponds to the length of the suction zone of at least 0.8 m, preferably at least 1.3 m and particularly preferably at least 1.7 m. Particularly preferably, the drying medium is sucked through the fibrous web in the wrapping area into the suction zone, wherein the drying medium is applied over a drying length of at least 0.95 m and particularly preferably of at least 1.35 m. This allows advantageous dewatering of the fibrous web before the press nip, which in particular ensures that the fibrous web does not experience any deterioration in its quality properties in the press nip.
[0015] In a further advantageous embodiment of the process, the fibrous web is dewatered to a dry content of at least 20%, preferably 23%, and particularly preferably 26%, before passing through the press nip. This ensures that the fibrous web does not experience any deterioration in its quality properties in the press nip.
[0016] In an equally advantageous embodiment of the method, the through-air drying of the fibrous web takes place in the drying area at a temperature greater than 120°C and particularly preferably greater than 180°C. Likewise preferably, the through-air drying takes place at a temperature of less than 250°C and in particular less than 220°C. This allows high drying rates or drying speeds, whereby the structural clothing, for example a dryer fabric and in particular a TAD fabric, can generally permanently withstand such temperatures. Typically, the fibrous web is guided over at least one through-air drum for through-air drying, whereby the structural clothing is preferably guided between the fibrous web and the through-air drum and a through-air medium, for example hot air and / or steam, is applied to the fibrous web for through-air drying and sucked through the structural clothing into the through-air drum.In particular, it is advisable to use an exhaust air medium from a machine section downstream of the drying section for through-air drying. This allows exhaust air from a subsequent drying hood—for example, one associated with a Yankee dryer—to be used at least partially for through-air drying.
[0017] The invention also relates to a machine for producing a fibrous web, in particular a structured tissue paper web. The machine comprises
[0018] - a forming area for forming the fibrous web from a fibrous suspension and
[0019] - a transfer area for transferring the fibrous web from a first forming fabric to a structural fabric
[0020] - a dewatering roll, in particular a suction roll, comprising a suction zone with an outlet area, wherein in a wrapping area of the dewatering roll the fibrous web is guided between the structural covering and a dewatering covering, in particular a felt, at least partially wrapping around the dewatering roll and the suction zone is at least partially encompassed by the wrapping area
[0021] - a drying area for through-air drying of the fibrous web. The fibrous web is guided on the structural fabric from the transfer area, via the dewatering roller, through the drying area. According to the invention, a press nip for mechanically dewatering the fibrous web guided between the structural fabric and the dewatering fabric is formed in the wrapping area between the dewatering roller and a counter roller. The press nip is arranged in the outlet area of the suction zone or downstream of the suction zone, with a drying hood assigned to the dewatering roller upstream of the press nip in the wrapping area and a drying medium, in particular hot air and / or steam, being able to be guided or sucked from the drying hood through the fibrous web into the suction zone of the dewatering roller.The design of the machine according to the invention allows the implementation of the method according to the invention and thus the achievement of the described advantageous effect, whereby with comparatively little effort (vacuum, drying medium, press nip) a significant increase in the dry content of the fibrous web before the drying area can be achieved and the quality parameters of the fibrous web are maintained.
[0022] In a particularly advantageous embodiment of the machine, the initial mechanical dewatering by pressing the fibrous web is achieved in the press nip between the transfer area and the drying area. Mechanical dewatering by pressing the fibrous web thus only occurs after the fibrous web, which is guided between the structural fabric and the dewatering fabric, has been passed over the suction zone of the dewatering roller, or the drying medium from the drying hood has been sucked through the fibrous web. The "pre-dewatered" fibrous web can pass through the subsequent press nip, whereby the mechanical dewatering by pressing has no detrimental effect on the quality properties of the fibrous web. The press nip is particularly advantageously designed with a line load greater than 30 kN / m, preferably with a line load greater than 40 kN / m and particularly preferably greater than 45 kN / m, in order to achieve significant dewatering of the fibrous web in the press nip.
[0023] In a further advantageous embodiment of the machine, the outlet area comprises a maximum of 30%, preferably a maximum of 20%, and particularly preferably a maximum of 15% of the length of the suction zone of the dewatering roller. The length of the suction zone is particularly advantageously at least 0.8 m, preferably at least 1.3 m, and particularly preferably at least 1.7 m. Due to dewatering before the press nip, the subsequent dewatering of the fibrous web by pressing has no detrimental effect on the quality properties of the fibrous web.
[0024] In an equally advantageous embodiment of the machine, the fibrous web is guided over at least one through-air drum in the drying area for through-air drying, and the structural clothing is arranged between the fibrous web and the through-air drum. The through-air flow occurs in such a way that a through-air medium, e.g. hot air and / or steam, is applied to the fibrous web and sucked through the structural clothing into the through-air drum. On the one hand, the fibrous web is firmly fixed to the structural clothing in this way, and on the other hand, the structural clothing is not in direct contact with the through-air medium, e.g. hot air and / or steam. Particularly preferably, an exhaust air medium from a machine section downstream of the drying section is used as the through-air medium. In particular, the exhaust air from a downstream drying hood - assigned to a Yankee - can be used at least partially for through-air drying.
[0025] In a further advantageous embodiment of the machine, the counter roll is designed as a smooth roll or as a shoe roll. In particular, the use of a smooth roll allows marking of the fibrous web in the press nip to be avoided, whereby the smooth roll preferably has a rubber or PU covering. The use of a PU covering with a hardness of 30 P&J has proven particularly advantageous. The use of a shoe roll as the counter roll allows the press nip to be designed as a long nip, which achieves improved structuring of the fibrous web by forming or pressing the fibrous web into the structural fabric for a longer period via the dewatering fabric.Furthermore, the long nip is characterized by advantageous dewatering and reduced rewetting, whereby the lower maximum nip pressures in the press nip - typical for the long nip - enable better subsequent separation of the structured fiber web from the structural clothing.
[0026] The invention will now be described by way of example with reference to the drawings.
[0027] Fig. 1 shows a machine according to the invention.
[0028] Fig. 2 shows the dewatering roller according to the invention between the transfer area and the drying area.
[0029] Fig. 1 shows a machine according to the invention, wherein a fibrous web 1, in particular a structured tissue paper web, is produced. The fibrous web 1 is formed in the forming area 13 from a fibrous suspension between a first forming fabric 2 and a second forming fabric. In a transfer area 3, the fibrous web is transferred from the first forming fabric 2 to a structured drying fabric 4, for example a structured drying fabric and in particular a TAD (Through Air Drying) fabric. Preferably, the fibrous web 1 is transferred from the faster rotating forming fabric 2 to the slower rotating structured fabric 4, wherein the forming fabric 2 preferably rotates more than 2% faster and particularly preferably more than 10% faster than the structured fabric 4.The fibrous web 1 is guided on the structural fabric 4 from the transfer area 3 via a dewatering roller 5, in particular a suction roller, and then through at least one drying area 6 designed for through-air drying. In the drying area 6, the fibrous web 1 is guided over at least one through-air drum 15, wherein the structural fabric 4 is preferably arranged between the fibrous web 1 and the through-air drum 15. The through-air drying of the fibrous web 1 preferably takes place at a temperature greater than 120°C and particularly preferably greater than 180°C. Optionally, the fibrous web 1 can be transferred from the structural fabric 4 to a drying cylinder 14, in particular a Yankee cylinder, for further drying after the further drying and possible creping of the fibrous web 1, iethe removal of the fibrous web 1 with a doctor blade directly from the surface of the drying cylinder 14, the rolling up of the fibrous web 1 can take place. In a wrapping area 7 of the dewatering roller 5, the fibrous web 1 is guided between the structured clothing 4 and the dewatering clothing 8, in particular a felt, over the dewatering roller 5, wherein the dewatering clothing 8 is guided between the fibrous web 1 and the dewatering roller 5. The fibrous web 1 wraps around the dewatering roller 5 at least partially and the wrapping area 7 comprises a press nip 10 formed between the dewatering roller 5 and a counter roller 9 for the mechanical dewatering of the fibrous web 1 by pressing. The counter roller 9 is, for example, a particularly smooth roller or a shoe roller.In front of the press nip 10, in the wrapping area 7, a drying hood 12 is arranged for applying a drying medium, in particular hot air and / or steam.
[0030] Fig. 2 shows the dewatering roller according to the invention between the transfer zone and the drying zone. In the transfer zone 3, the fibrous web 1 is transferred from the forming fabric 2 to the structured fabric 4 and, on the structured fabric 4, is fed via the dewatering roller 5 to the drying zone 6 designed for through-air drying. The dewatering roller 5 is designed in particular as a suction roller, wherein in the wrap-around zone 7 of the dewatering roller 5, the fibrous web 1 is guided between the structured fabric 4 and a dewatering fabric 8, in particular a felt, over the dewatering roller 5, and the dewatering fabric 8 is guided between the fibrous web 1 and the dewatering roller 5. The fibrous web 1 wraps at least partially around the dewatering roller 5.A suction zone 11 of the dewatering roller 5 is at least partially encompassed by the wrapping region 7 and enables the dewatering of the fibrous web 1. According to the invention, the wrapping region 7 comprises a press nip 10 formed between the dewatering roller 5 and a counter-roller 9, wherein the fibrous web 1 is mechanically dewatered in the press nip 10 by pressing and the press nip 10 is arranged in an outlet region of the suction zone 11. The outlet region comprises, for example, a maximum of 30%, preferably a maximum of 20%, and particularly preferably a maximum of 15% of the length of the suction zone 11 of the dewatering roller 5. Alternatively, the press nip 10 can also be arranged downstream of the suction zone 11.
[0031] Preferably, between the transfer area 3 and the drying area 6, the mechanical dewatering by pressing the fibrous web 1 takes place for the first time in the press nip (10), wherein the mechanical dewatering by pressing in the press nip 10 takes place with a line load greater than 30 kN / m, preferably greater than 40 kN / m and particularly preferably greater than 45 kN / m. Particularly advantageous dewatering via the suction zone 11 of the dewatering roller 5 is achieved with a length of the suction zone of at least 0.8 m, preferably at least 1.3 m and particularly preferably at least 1.7 m. According to the invention, in the wrapping area 7, a drying medium, in particular hot air and / or steam, is sucked from the drying hood 12 upstream of the press nip 10 through the fibrous web 1 into the suction zone 11 of the dewatering roller 5.
[0032] The present invention offers numerous advantages. Unexpectedly, a significant increase in the dry content of the fibrous web prior to the drying section is achieved while maintaining the quality parameters of the fibrous web. The fibrous web is protected in the press nip by the structure of the structural fabric, and in particular, the "pre-dewatering" according to the invention ensures that the fibrous web has a sufficiently low moisture content or sufficiently high dry content, so that the press nip has no negative effect on the quality properties of the fibrous web.
[0033] Reference symbol
[0034] 1 fibrous web
[0035] 2 forming covering
[0036] 3 Transfer area 4 Structural covering
[0037] 5 Dewatering roller
[0038] 6 Drying area
[0039] 7 Wrapping area 8 Drainage covering
[0040] 9 Counter roller
[0041] 10 press nip
[0042] 11 Suction zone
[0043] 12 Drying hood 13 Forming area
[0044] 14 drying cylinders
[0045] 15 Flow-through drum
Claims
Patent claims 1 . A method for producing a fibrous web (1), in particular a structured tissue paper web, comprising the steps: - forming the fibrous web (1) from a fibrous suspension and transferring the fibrous web (1) in a transfer area (3) from a first forming fabric (2) to a structural fabric (4) - guiding the fibrous web (1) on the structural fabric (4) from the transfer area (3) over a dewatering roller (5), in particular a suction roller, further through at least one drying area (6) designed for through-air drying, wherein in a wrapping area (7) of the dewatering roller (5), the fibrous web (1) is guided between the structural fabric (4) and a dewatering fabric (8), in particular a felt, over the dewatering roller (5) and at least partially wraps around the dewatering roller (5), a suction zone (11) of the dewatering roller (5) is at least partially encompassed by the wrapping area (7), and the fibrous web (1) is dewatered via the suction zone (11), characterized in that the wrapping area (7) comprises a press nip (10) formed between the dewatering roller (5) and a counter roller (9),the fibrous web (1) is mechanically dewatered in the press nip (10) by pressing and the press nip (10) is arranged in an outlet area of the suction zone (11) or after the suction zone (11), wherein upstream of the press nip (10) in the wrapping area (7) a drying medium, in particular hot air and / or steam, is sucked from a drying hood (12) through the fibrous web (1) into the suction zone (11) of the dewatering roller (5).
2. Method according to claim 1, wherein between the transfer area (3) and the drying area (6) the mechanical dewatering by pressing the fibrous web (1) takes place for the first time in the press nip (10).
3. Method according to one of claims 1 to 2, wherein the mechanical dewatering is carried out by pressing with a line load greater than 30 kN / m, preferably greater than 40 kN / m and particularly preferably greater than 45 kN / m.
4. Method according to one of claims 1 to 3, wherein the mechanical dewatering is carried out by pressing with a line load of at most 100 kN / m, preferably at most 80 kN / m and particularly preferably at most 55 kN / m.
5. Method according to one of claims 1 to 4, wherein the fibrous web (1) is dewatered via the suction zone (11) for a period of time corresponding to the length of the suction zone (11) of at least 0.8 m, preferably at least 1.3 m and particularly preferably at least 1.7 m.
6. Method according to one of claims 1 to 5, wherein the fibrous web (1) is dewatered to a dry content of at least 20%, preferably at least 23% and particularly preferably at least 26% before passing through the press nip (1).
7. Method according to one of claims 1 to 6, wherein in the transfer area (3) the fibrous web (1) is transferred from the faster rotating forming fabric (2) to the slower rotating structural fabric (4) and the forming fabric (2) preferably rotates more than 2% faster and particularly preferably more than 10% faster than the structural fabric (4).
8. Method according to one of claims 1 to 7, wherein in the drying area (6) the through-flow drying of the fibrous web (1) takes place at a temperature greater than 120°C and particularly preferably greater than 180°C.
9. Machine for producing a fibrous web (1), in particular a structured tissue paper web, comprising: - a forming area (13) for forming the fibrous web (1) from a fibrous suspension and - a transfer area (3) for transferring the fibrous web (1) from a first forming fabric (2) to a structural fabric (4) - a dewatering roll (5), in particular a suction roll, comprising a suction zone (11) with an outlet area, wherein in a wrapping area (7) of the dewatering roll (5) the fibrous web (1) is guided between the structural covering (4) and a dewatering covering (8), in particular a felt, at least partially wrapping around the dewatering roll (5) and the suction zone (11) is at least partially encompassed by the wrapping area (7) - a drying area (6) for through-flow drying of the fibrous web (1), wherein the fibrous web (1) is dried on the structural fabric (4) by the Transfer area (3), via the dewatering roller (5), can be guided through the drying area (6), characterized in that in the wrapping area (7) a press nip (10) for mechanically dewatering the fibrous web (1) guided between the structural fabric (4) and the dewatering fabric (8) is formed between the dewatering roller (5) and a counter-roller (9) and the press nip (10) is arranged in the outlet area of the suction zone (11) or after the suction zone (11), wherein upstream of the press nip (10) in the wrapping area (7) a drying hood (12) is assigned to the dewatering roller (5) and a drying medium, in particular hot air and / or steam, can be guided from the drying hood (12) through the fibrous web (1) into the suction zone (11) of the dewatering roller (5).
10. Machine according to claim 9, wherein the first mechanical dewatering is realized between the transfer area (3) and the drying area (6) by pressing the fibrous web (1) in the press nip (10).
11. Machine according to one of claims 9 to 10, wherein the press nip (10) between the dewatering roller (5) and the counter roller (9) is designed to press the fibrous web (1) with a line load greater than 30 kN / m, preferably greater than 40 kN / m and particularly preferably greater than 45 kN / m.
12. Machine according to one of claims 9 to 11, wherein the outlet area comprises a maximum of 30%, preferably a maximum of 20% and particularly preferably a maximum of 15% of the length of the suction zone (11) of the dewatering roller (5).
13. Machine according to one of claims 9 to 12, wherein the length of the suction zone (11) is at least 0.8 m, preferably at least 1.3 m and particularly preferably at least 1.7 m.
14. Machine according to one of claims 9 to 13, wherein in the drying area (6) the fibrous web (1) is guided over at least one through-flow drum (15) for through-flow drying and the structural fabric (4) is always arranged between the fibrous web (1) and the through-flow drum (15).
15. Machine according to one of claims 9 to 14, wherein the counter roller (9) is a particularly smooth roller or a shoe roller.