DE102009027030A1 - Web-making machine - Google Patents

Abstract

The press section of the machine has at least two compact press nips (N1, NP1) formed between the suction press roll (11) and the central roll (31) and between the central roll (31) and the first wide nip roll (41). The first press nip (N1) has the pick-up felt (10) on the side facing the first suction press roll (11) as press fabric, and the second press nip (NP2) has the press fabric on the side facing the first wide-nip roll (41) first upper felt (40). The central roller (31) is looped by the first heated (32) metal strap loop (30) from the surface of the web (W) behind the second nip (NP2) at the between the first transfer suction roll (51) and the first metal strap loop (30). placed first transfer point (S1) on the first transfer screen (50) and transported by this supported in the machine.

Description

TECHNICAL AREA

object This invention is a web-forming machine according to the preamble of claim 1.

object The invention is also a method according to the preamble of claim 9th

STATE OF THE ART

To the material web-making machines, in the following short material web machines These include the paper, board, tissue and pulp machines. Under single press the press section of a web machine is to be understood in the present application a press at the opposing pressing elements only a single Form press nip. The press nip of the single press can either be Walzennip or a wide nip (shoe press nip) be. The contrary to the single press is the central roll press, in which the central roll forms a press nip with at least two other rollers. The Press nips of the central roll press can roll nips and / or Be wide nips.

task It is the press section, the material web, in the following also briefly Called course, deprive water and make it symmetrical, with then the absorption and roughness properties of the two sides the web are symmetrical to each other.

The open trains behind the central roller of the compact press and the single press cause web breaks and restrict the production speed of the press section. When closed Train with transfer band kicking the missing dots and dusting the Material web as problems in appearance. Achieved with transfer tape one does not have the best possible smoothness and the best possible dry content of the web. Set as a central roll one Thermo roll, so their temperature may not be too high, because the low dry content material web easily stick to the central roller.

in the EP patent 0868567 is in 5 a press section is shown, which has a central roller press with three nips and a following on this separate fourth Breitnippresse. The third nip of the central roller press is also a wide nip. The central roll and the counter roll of the fourth press may be heated thermo rolls. From the central roll press to the fourth press and from the fourth press to the dryer section there is open web guide. At the center roll, the web has a relatively low dry content so that adhering the web to the center roll as its temperature increases becomes a problem.

in the FI patent 92941 is a described by a suction roll and a heated central roll Transfernip described. During the transfer process, the Saugwalzentransfernip is located at the central roller, so that the train can not be stretched during the transfer by means of Zugdifferenz, but remains loose. It is easy to web errors in the transfer area, especially because the web strongly adheres to the smooth, air-impermeable, highly adhesive central roller. At the center roll, the web has a relatively low dry content so that adhering the web to the center roll as its temperature increases becomes a problem.

In the FI Publication 20055055 is in 6 a press section is shown with a three-nip central roll press and a separate fourth nip press. A transfer belt is arranged around the central roller and the fourth press. The web is transferred from the central roll transfer belt with a separate transfer fabric on the press felt of the press-nip press. The fourth wide-nip press is followed by the dryer section with horizontal impingement-drying and subsequent vertical impingement-flow drying. With the transfer belt no particularly good surface finish of the web is achieved, and on the transfer belt, the web can also be fed no additional heat energy.

In the FI Publication 885737 a central roller press is described, in which a band is arranged around the central roller and continuously forms a belt loop over a plurality of guide and tension rollers. The web is, between Pick-up felt and Unterfilz located in the formed by the first suction roll and the first grooved roll first press nip out there and placed on the pick-up felt. Thereafter, the web, now located on the pick-up felt, passed over the suction sector of the first suction roll in the press nip formed by the first suction roll and the central roll. In the second press nip, the web is brought onto the belt running around the central roller and guided on the belt into the third press nip which the central roller and the second grooved roller form with one another. Behind the third press nip, the web is guided against the said band to the transfer point between the band and the second suction roll. At the transfer point, the web is transferred to the dryer fabric running around the second suction roll. All press nips are roll nips. The belt must be air permeable so that when transferring the web from the press section into the dryer section the pick-up technique is used can be. The tape is therefore perforated. As strip material, a suitable metal, for example steel, which tolerates high temperatures, can be used, but also various plastics, polymers and. Like. Would be conceivable as strip material.

in the FI patent 81625 is a method for using a thin, highly thermally conductive, endless, heated strip described in the press nip. The band forms a widened pressing zone with the suction roll. The increase in dry content of the web remains very low when using a suction roll nip formed by rolls and fabric tension. Since the dry content of the web behind the nip is relatively low, the web must remain at the surface of the heated belt for a very long time before it can be controlled and detached from the belt without damage to the web. The device thus requires a lot of space in the machine direction and is correspondingly expensive to stand.

in the FI patent 81626 is a method for using a thin, highly thermally conductive, endless, heated strip described in the press nip. The web adheres to the tape in the press nip and continues along with it until so much water has been released from the web that it releases itself from the tape. The increase in the dry content of the web remains quite modest when using a roll nip, so the web must be on the heated belt for a very long time before its dry content is high enough to detach from the belt. This device thus requires a lot of space in the machine direction and is correspondingly expensive.

SUMMARY OF THE INVENTION

task The present invention is to provide a material web machine with one around a central roller and possibly also around a single press built, especially for the renewal of the press section suitable, high production speed and good quality enabling the press concept.

The main characteristic features of the invention Material web machine go from the characterizing part of claim 1 forth.

The main characteristic features of the invention Process go from the characterizing part of claim 9 forth.

at the solution according to the invention is closed Pull the web using a simple heated metal strap loop on the central roller and possibly also on the single press. With Increase of the dry content of the railway to a level of approx. 55% decreases the contact of the web to the metal strip, and the web then dissolves easily from the metal band. In the 3-nip central roller press SymPress B is the dry content of the web behind the third nip at a production speed of 1200 m / min about 53-55% When using a guided around the central roller heated metal strip and heated fabric (fabrics) achieved you get 4-8% higher behind the third nip Dry content of the web, so that the web even if much higher speeds are driven, very easily detached from the metal strip.

From the first heated metal loop, the web is on a separate Transfer screen loop transferred and from this transported in the machine. With the separate transfer straps loop the required difference in tension is caused on the track and the Direction of the path changed so that this on the following tissue can be brought.

With one with a 3-nip center roll press SymPress B and a wide nip single press equipped press section, in which the solution according to the invention For example, SC paper may be used with the following Values are produced: speed in the range 1900-2500 m / min, Line pressure of the first roll nip in the range 20-150 kN / m, Line pressure in the second roll nip in the range 80-160 kN / m and lineprints in the third and fourth nip in the area 1200-1600 kN / m. The dry content of the web is behind the press section then in the range of 56-62% The heated metal strap loop can be coated with a suitable coating material if required be, and / or on the surface of the metal strap loop and / or the web can be applied an adhesion control agent, with the detachment of the web from the heated metal band ensured becomes.

It Now follows a detailed description of the invention with reference in the various embodiments illustrated in the drawings, on the details of which the invention, however, in no way strictly limited is.

BRIEF DESCRIPTION OF THE DRAWINGS

1 schematically shows a material web machine according to the invention.

2 schematically shows a variant of in 1 illustrated web machine.

3 schematically shows a second variant of in 1 illustrated web machine.

DESCRIPTION OF PREFERRED EMBODIMENTS

1 schematically shows a material web machine according to the invention. The press section here comprises a central roll press and a subsequent single press.

The web W is at the pick-up point P with the pick-up suction roll 12 from the forming fabric 9 on the pick-up felt 10 brought the press section. Behind the pick-up point P, the web is first at the bottom of the water-absorbing pick-up felt 10 and then between the pick-up felt 10 and the water receiving pre-press underfelt 20 in a straight run, essentially in a horizontal plane, to the prepress nip NO, a two-felt roll nip, guided in the central roll press. The upper roll of the pre-press NO is the suction press roll 11 , as a lower roller, the profiled pre-press roller 21 , Behind the pre-press nip NO, the web W becomes in the suction sector of the suction press roll 11 acting vacuum on the outside of the first top felt 10 held and the first nip N1 of the central roller press, a single-felt roller nip guided. The lower roller of the first press nip N1 is the suction press roller acting as the top roller of the pre-press nip NO 11 and as top roller, the central roller 31 to get the first metal strap loop 30 is arranged with the first heater 32 is heated. Behind the first press nip N1 of the central roll press, the web W travels on the outside of the central roll 31 ongoing first metal band 30 to the second press nip NP1 of the central roll press, which consists of a single felt nip. The lower roller of the second nip NP1 of the central roller press is the central roller 31 and as top roll, the first wide nip roll 41 , Which consists of a flexible hose jacket with a therein arranged, by a hydraulic pressure medium loadable press shoe, with the required pressing pressure on the between the first upper felt 40 and the first metal band 30 railway W is exercised. The second press nip NP1 of the central roll press is thus the first wide nip of the press section.

Behind the second press nip NP1 of the central roll press, the web W on the outside of the first metal strip 30 obliquely downward to the first transfer point S1 between the first metal strip 30 and the first transfer suction roll 51 guided. To support the first metal band 30 and for preventing vibration of this metal band may be within the metal band loop 50 (po 30?) At least one sliding element, which consists of a support element 33 can be arranged with a low coefficient of friction. The contact surface of the support element 33 with the first metal band 30 can be a lubricated surface. To the first transfer suction roll 51 the first transfer screen is running 50 , The web W is at the first transfer point S1 in the suction sector of the first transfer suction 51 to the outside of the first transfer screen 50 brought and supported by this to the second transfer point S2 between the first transfer screen 50 and the underfelt loop receiving within the water 60 located second transfer suction roll 62 transported. At the second transfer point S2, the web W in the suction sector of the second transfer suction roll 62 to the outside of the underfelt 60 brought and supported by this to the press nip NP2 of the single press, a one-felt-wide nip, transported. The upper press roll NP2 of the single press is the second press roll 71 to the the second metal strap loop 70 is arranged with the second heater 72 is heated. As a lower roller of the press nip NP2 of the single press is the second Breitnipwalze 61 , which consists of a flexible hose jacket with a therein arranged, by a hydraulic pressure medium loadable press shoe, with the required pressing pressure on the between the lower felt 60 and the second metal band 70 railway W is exercised. The press nip NP2 of the single press thus forms the second wide nip of the press section.

Behind the press nip NP2 of the single press is the web W, from the second metal band 70 carried to the third transfer point S3 between the second metal band 70 and inside the dry-sift loop 80 the first drying unit D1 located third transfer suction 81 transported. To support the second metal band 70 and for preventing vibration of this metal band may be within the metal band loop 70 at least one sliding element, which consists of a support element 73 can be arranged with a low coefficient of friction. The contact surface of the support element 73 with the second metal band 70 can be a lubricated surface. The web W is then transferred to the third transfer point S3 in the suction sector of the third transfer suction roll 81 to the outside of the dryer 80 brought the first drying unit D1 and guided by this supported by the first drying unit D1. In the first drying unit D1, the web W becomes a straight or curved substantially horizontal impingement dryer 83 , the vacuum elements 84 includes, such as suction boxes and guide rollers 85 , which preferably consist of suction rolls or deep grooved so-called disk rollers dried.

Behind the first drying unit D1, the web W at the fourth transfer point S4 on the drying wire 90 the second drying unit D2 transferred. The fourth transfer point S4 is located between the guide roller 82 of the dryer 80 the first drying unit D1 and the guide roller 91 Drying bens 90 the second drying unit D2. In the second drying unit D2, the web W becomes straight or curved, substantially vertical impingement flow dryers 93 . 94 dried. In the dry-sieve loop 90 the second drying unit D2 are vacuum elements, such as suction boxes 95 as well as guide rollers 96 , which preferably consist of suction rolls or deep grooved so-called disk rollers arranged.

Behind the second drying unit D2 is the web W with the drying wire 90 the second drying unit D2 on the first drying cylinder 101 brought. From this first drying cylinder, the web W on the drying wire 100 taken from the first drying cylinder group R1 and supported by this to the first Saugumlenkwalze 102 brought the first drying cylinder group R1. On this Saugumlenkwalze 102 is a runnability component 103 arranged.

Behind the first transfer point S1 can be a steam box 52 against the first transfer suction roll 51 be directed. The web W has a relatively high dry content at the first transfer point S1, and the first transfer suction roll 51 Injects the vapor intensively into the web W, whereby a strong increase in the temperature and the dry content of the web W and a good profiling ability can be achieved.

Inside the underfelt loop running through the press nip NP2 of the single press 60 can be a vacuum device, for example, a Blaugaugkasten immediately before the press nip NP2 the single press 63 , are arranged, with the adherence of the web W to the lower felt 60 is ensured.

Inside the second dryer-sieve loop 90 can immediately before the fourth transfer point S4 a Blassaugkasten 92 are arranged, with which it is ensured that the web W at the fourth transfer point S4 to the second drying wire 90 liable.

In this solution can also dry cover 10 . 20 . 40 and 60 effective conditioning and conditioner, the wear of the clothing reducing conditioner be used, whereby one achieves a higher dry content of the web and a longer life of the fabric with lower drive power consumption of the press section. Such a string conditioning device is in FI Publication 20065498 the applicant described.

This solution can be used to guide the press fabric 10 . 20 . 40 . 60 Also, a technique may be used in which the tensioning and guiding of the tissue is accomplished by altering the position of only a single roller relative to the tissue. Such an arrangement is in FI patent 116399 the applicant described.

The press section can be equipped with an air-conditioned hood 200 are covered, the process, since then the heat does not escape into the machine hall, made energy efficient cheaper. The warm coverings also contribute to increasing the dry content of the web W, and dry air can be added to the web to enhance evaporation in the press section.

The first heated metal band 30 and the second heated metal band 70 each form a simple, only two rolls 31 . 34 . 71 . 74 running endless loop. Also the first transfer screen 50 forms a corresponding simple and closed to two rollers 51 . 53 running loop.

The first and the second metal band 30 . 70 consist of air-impermeable, surface-smooth metal bands.

2 schematically shows a variant of the embodiment according to 1 , in which now the pre-press NO of the central roller press and the associated pre-press roller 21 as well as the pre-press felt loop 20 are omitted. The web W is here directly from the pick-up point P with the pick-up felt 10 in the from the central roll 31 and the suction press roll 11 transported formed first nip N1. Otherwise, the in 2 shown embodiment of the embodiment of 1 ,

In 3 is schematically a second variant of in 1 shown embodiment, in which now the following on the central roller press single press NP2 is omitted. The web W is now from the first transfer screen 50 directly on the first drying wire 80 transferred. Otherwise, the in 3 shown embodiment of the embodiment of 1 ,

In 1 For example, the pre-press nip NO, which may consist of a roll nip or a nip, is sandwiched between the suction press roll 11 and the pre-press roller 21 educated. The Vorpressnip NO could, however, also be on the track between pick-up point P and Saugpresswalze 11 be formed as a completely separate Vorpressnip - either as a roll or as a broad nip - between two rolls.

The applicant markets the press section 1 and 2 under the product name SymPress B + IV and the press section according to 3 under the product name SymPress B.

At the in 1 and 2 As shown embodiments, the transfer of the web W with train difference takes place on both sides of the press nips NP2. Before the last press nip NP2, the web W is transferred at the second transfer point S2 with the second transfer suction roll acting on the underside of the web W 62 the press section, and behind the last press nip NP2, the transfer of the web W takes place at the third transfer point S3 with the third transfer suction roll acting on the underside of the web W 81 , In the last press nip NP2, the web W is only down in the lower press fabric 60 of the last press nips NP2 drained. The asymmetric drainage in the last press nip NP2 causes a higher concentration of fines on the underside of the web W, but this fines asymmetry is due to the draw and suction transfers NP2 on both sides of the last nip NP2 where the web W is different from the web top in FIG Contact tissue is compensated. The end result is therefore a symmetrical path W in this respect.

at the embodiments shown in the drawings At the railway transfer points transfer suction rollers used, but of course Transfers can also be made with transfer boxes become.

in the The following are the claims are listed. Within the scope of the inventive idea defined in them the various details of the invention vary and from the above, merely differ from exemplary embodiments.

The press section of the machine has at least two compact press nips (N1, NP1) which are located between the suction press roll (FIG. 11 ) and the central roller ( 31 ) and between the central roller ( 31 ) and the first Breitnipwalze ( 41 ) are formed. The first press nip (N1) has on the first suction press roll ( 11 ) side facing as press fabric the pick-up felt ( 10 ), and the second press nip (NP2) has on the first Breitnipwalze ( 41 ) facing side as press fabric the first top felt ( 40 ). The central roller ( 31 ) is heated by the first ( 32 ) Metal strap loop ( 30 ), from whose surface the web (W) behind the second press nip (NP2) at the between the first transfer suction ( 51 ) and the first metal strap loop ( 30 ) first transfer point (S1) on the first transfer screen ( 50 ) and transported by this supported in the machine.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 0868567 [0006]
• - FI 92941 [0007]
• - FI 20055055 [0008]
• - FI 885737 [0009]
• - FI 81625 [0010]
• - FI 81626 [0011]
• - FI 20065498 [0031]
• - FI 116399 [0032]

Claims (16)

Web-forming machine whose press section comprises at least two compact press nips (N1, NP1) which are fed by means of three rolls ( 21 . 31 . 41 ) are formed so that the first single-felt press nip (N1) between the suction press roll ( 11 ) and the central roller ( 31 ) and the second single-felt press nip (NP1) between the central roll ( 31 ) and the first press roll ( 41 ), wherein the suction press roll ( 11 ) facing press fabric from the water receiving pick-up felt ( 10 ) and that of the first press roll ( 41 ) facing press fabric from the first water receiving upper felt ( 40 ) is formed, and around the central roller ( 31 ) the first metal strap loop ( 30 ), on the surface of which the web (W) is adhered in said first single-felt press nip (N1), and from the surface of which the web (W) behind said second single-felt press nip (NP1) abuts between the transfer suction roll ( 51 ) and the first metal strap loop ( 30 ) located first transfer point (S1) on the first transfer suction ( 51 ) running fabrics ( 50 ), characterized in that the first press roll the first Breitnipwalze ( 41 ), the first metal strap loop ( 30 ) of an air-impermeable, smooth-surfaced metal strip which is connected to the first heating device ( 32 ) is heated, and is formed around the transfer suction roll ( 51 ) running fabric the first transfer screen ( 50 ), from which the web (W) is propelled in the machine. Web machine according to claim 1, characterized in that within the first metal loop ( 30 ) only the central roller ( 31 ) and the first guide roller ( 53 ), so that the first metal strap loop ( 30 ) so only two rolls revolves. Web machine according to claim 1 or 2, characterized in that within the first transfer mesh loop ( 50 ) only the transfer suction roll ( 51 ) and the second guide roller ( 73 ) so that the transfer mesh loop ( 50 ) so only two rolls revolves. Material webbing machine according to any one of claims 1 to 3, characterized in that it separates one between said suction press roll ( 11 ) and the pre-press roller ( 21 ) formed two-felt Vorpressnip (NO), wherein as Vorpresswalzenseitiges ( 21 ) Press fabric of the pre-press bottom felt ( 20 ) and as Saugpresswalzenseitiges ( 11 ) Press fabric of the pick-up felt ( 10 ) serves. A webbing machine according to any one of claims 1 to 4, characterized in that behind said second single-felt press nip (NP1) there is a single press with a one-felt press nip (NP2) between the second press roll (NP2). 71 ) and the second Breitnipwalze ( 61 ), wherein as press fabric of the single-felt press nips (NP1) of the single press on the to the second Breitnipwalze ( 61 ) side facing the water-absorbent underfelt ( 60 ), on which the web (W) with the first transfer screen ( 50 ) at the one between the first transfer screen ( 50 ) and within the sieve loop ( 60 ) second transfer suction roll ( 62 ) is brought to the second transfer point (S2). Web machine according to claim 5, characterized in that around the second press roll ( 71 ) of the single-felt press nip (NP2) of said single press a second heated ( 72 ) Metal strap loop ( 70 ), on the surface of which the web (W) is adhered in the single-press single-press nip (NP2), and from the surface thereof the web (W) behind the single-press single-press nip (NP2) at the third transfer point (S3) between the third transfer suction roll (S3) 81 ) and the second metal strap loop ( 70 ) on the around the second transfer suction ( 81 ) running first drying wire ( 80 ) of the first drying unit (D1) and from this sieve ( 80 ) is transported further supported in the machine. Web-forming machine according to claim 6, characterized in that the first drying unit (D1) consists of a straight or curved horizontal impingement-flow dryer ( 83 ), wherein the web (W) of the first drying wire ( 80 ) guided by the first drying unit (D1) and further at the fourth transfer point (S4) between the inside of the first Trockensiebschlaufe ( 80 ) guide roller ( 82 ) and within the second Trockensiebschlaufe ( 90 ) of the second drying unit (D2) located guide roller ( 91 ) on the second drying wire ( 90 ) of the second drying unit (D2). Material webbing machine according to claim 7, characterized in that the second drying unit (D2) consists of a straight or curved vertical impingement flow dryers ( 93 . 94 ), wherein the web (W) of the second drying wire ( 90 ) supported by the second drying unit (D2) and further on the first drying cylinder ( 101 ) and from there to the drying wire ( 100 ) of the first drying cylinder group (R1) is transferred. Method in a material web machine, in which at least two compact press nips (N1, NP1) are produced in the press section, which consist of three rolls ( 11 . 31 . 41 ) are formed so that the first single-felt press nip (N1) between the first suction press roll ( 11 ) and the central roller ( 31 ) and the second single-felt press nip (NP1) between the central roller ( 31 ) and the first press roll ( 41 ), wherein as the first suction press roll ( 11 ) facing press fabric of the first single-felt press nip (N1) of the pick-up felt ( 10 ) and as the first press roll ( 41 ) of the second press nip (NP1) facing press fabric of the first single-felt press nip (N1) of the water-absorbing top felt ( 40 ) and around the central roller ( 31 ) the first metal strap loop ( 30 ) is arranged, on whose surface the web (W) in the first press nip (N1) is adhered, and from whose surface the web (W) behind the second press nip (NP1) at the between the first transfer suction ( 51 ) and the first metal strap loop ( 30 ) located first transfer point (S1) on the first transfer suction ( 51 ) running fabrics ( 50 ), characterized in that the first press roll is the first wide-nip roll ( 41 ), as the first metal strap loop ( 30 ) an air-impermeable, surface-smooth metal strip which is connected to the heating device ( 32 ) is heated, and as to the transfer suction ( 51 ) running fabric the first transfer screen ( 50 ) is used, supported by the web (W) is transported in the machine. Method according to claim 9, characterized in that the first metal loop ( 30 ) around the central roller ( 31 ) and the first guide roller ( 53 ), so that the first metal loop ( 30 ) is guided by only two rollers. Method according to claim 9 or 10, characterized in that the first transfer suture loop ( 50 ) via the transfer suction roll ( 51 ) and the second guide roller ( 73 ), so that the first Transfersiebschlaufe ( 50 ) is guided by only two rollers. Method according to any one of claims 9 to 11, characterized in that between said suction press roll ( 11 ) and the pre-press roller ( 21 ) a two-felt preforming nip (NO) is produced, wherein as a pre-press roll side ( 21 ) Press fabric of the pre-press bottom felt ( 20 ) and as Saugpresswalzenseitiges (11) press fabric of the pick-up felt ( 10 ) serves. Method according to any one of claims 9 to 12, characterized in that behind the second press nip (NP1) a single press with a single-felt press nip (NP2) is interposed between the second press roll (NP1). 71 ) and the second Breitnipwalze ( 61 ) is arranged, being used as press fabric of the single-felt press nips (NP2) of the single press on the to the second Breitnipwalze ( 61 ) side facing the water-absorbent underfelt ( 60 ) on which the web (W) with the first transfer screen ( 50 ) at the one between the first transfer screen ( 50 ) and the second transfer suction roll ( 62 ) is brought to the second transfer point (S2). A method according to claim 13, characterized in that around the second press roll ( 71 ) of the press nip (NP2) of the single press a second heated ( 72 ) Metal strap loop ( 70 ), on the surface of which the web (W) is adhered in the press nip (NP2) of the single press and from the surface of which the web (W) is interposed behind the press nip (NP2) of the single press at the third transfer point (S3) the third transfer suction roll ( 81 ) and the second metal strap loop ( 70 ) on the around the second transfer suction ( 81 ) running first drying wire ( 80 ) of the first drying unit (D1) and from this sieve ( 80 ) is transported further supported in the machine. A method according to claim 14, characterized in that the web (W) in the first drying unit (D1) with a straight or curved horizontal impingement dryer ( 83 ), wherein the web (W) from the first drying wire ( 80 ) guided by the first drying unit (D1) and further at the fourth transfer point (S4) between the inside of the first Trockensiebschlaufe ( 80 ) guide roller ( 82 ) and within the second Trockensiebschlaufe ( 90 ) of the second drying unit (D2) located guide roller ( 91 ) on the second drying wire ( 90 ) of the second drying unit (D2). Method according to claim 15, characterized in that the web (W) in the second drying unit (D2) is provided with straight or curved vertical impingement flow dryers (D2). 93 . 94 ), wherein the web (W) from the drying wire ( 90 ) of the second drying unit (D2) supported by the second drying unit (D2) and further on the first drying cylinder (D2) 101 ) and from there to the drying wire ( 100 ) of the first drying cylinder group (R1) is transferred.