DE4328554A1 - Paper-making machine drying section - has automatic leader guide system also at the start of twin-blanket drying group - Google Patents

Abstract

The end section of a web drying assembly, in a paper-making machine, is a twin-blanket section with an automatic leader guide (77,78) without cables. Pref., the drying section has cylinders of the single blanket group(s) where the web contact surface form 60-85% of the whole drying section for newsprint, 5-80% for SC paper, 40-75% for fine papers and 5-20% for cardboard, to give newsprint with 55-85% dry content, and dry contents of 50-70% for SC paper, fine paper and cardboard. The leader guide (77,78) has a blowing system to carry the leading end from cylinder (74) to cylinder (74'), with the wall of at least one component, such as a scraper carrier (77), parallel to the free web path to deliver an air stream in the line of web travel. At the end of the single-blanket section (23), part of the leader guide (79) can be disconnected so that the incoming leader (9A) temporarily leaves the web path, working with units (79,80) to cut and advance the leader. USE/ADVANTAGE - The assembly is for drying a paper web, in paper-making, where edge strips are cut as leaders to feed through the sections on start-up. The assembly gives a consistent paper quality on both sides, without risk of web fracture even with a high final dry content of around 98% as longitudinal tensions ar broken down, with a conventional point cutter and no cable guides, and without blanket wear.

Description

The invention relates to a dryer section for drying a running web, preferably as part of one Paper making machine. The starting point of the invention is a drying section with the in the preamble of claim 1 specified features, from DE-PS 40 37 661 (file P 4748) are known. Such a dryer section is in divided into several successive drying groups. Each these drying groups include several heatable ones Drying cylinders that come into contact with the web and that are coupled to a (preferably common) drive. On the one hand, a distinction is made between single-felt drying groups which each have only one endless felt (or one such sieve). This felt runs together with the Meandering web over the cylinders and over guide rollers, preferably deflection suction rolls. Such one-felt Dry groups are usually in the beginning of the Dryer section provided that the web to be dried in a still relatively moist condition (with a dryness of around 35-55% depending on Paper type and working speed). On the other hand, usually in the end of the dryer section, one or several two-felt dryer groups are provided. Any of these Dryer groups has an upper and a lower cylindrical Row, the track alternating over the top and the lower cylinder runs. The two-felt dryer group (s) can or can directly on the last one-felt Follow the drying group or it is an additional unit (Size press, dampening unit or the like.) Pushed in between.

One aspect of the present invention is concerned with Problem of threading the web to be dried into the Dryer section. As is well known, the following will apply provided: The in the beginning of the Papermaking machine made and mechanical  the drained run runs at full during the start-up phase Working speed temporarily only until the end of the Press section or up to the first drying cylinder of the Dryer section. From there it goes down into one Reject breakdown system. You now separate one from the train narrow marginal strips, hereinafter referred to as "ribbon". This is first carried out by the single-felt dryer group or through the one-felt dryer groups (usually are several available) passed through. It is known that this can be done without the use of ropes. With in other words: it is an automatic rope-less Management facility available. For example, the Ribbon by means of a scraper with an air blowing nozzle combined, detached from the individual cylinders. In addition, special marginal Suction chambers provided in which during the Pull-in process - regardless of the rest of the Deflection suction roll - creates a relatively high vacuum becomes.

In contrast, according to DE '661 in or subsequent two-felt dryer group (s) for the purpose of A rope guide is provided for pulling in the ribbon. This is however, occasionally the cause of interference (the ribbon can slip out of the rope guide) or accidents (Danger for the staff if a rope is broken). It there is therefore a requirement in the entire dryer section modern paper making machines rope guides to avoid completely. This applies in particular to Machines with high working speed (order of magnitude 1,500-2,400 m / min).

To achieve this object, an automatic rope-less ribbon guide device is also provided in the two-felt dryer group (s) according to the invention. Suitable elements of various types are known per se from the following publications:
DE-PS 12 45 278,
DE-GM 89 14 679 (file P 4692),
DE-GM 91 09 313 (file P 4829).

Tests have shown that the reliability of such pneumatically acting elements leaves something to be desired, if the web dry matter content is still relatively low. they however, work well after the web dryness has reached a certain value, which at different Types of paper, basis weights and speeds right is different (claim 2). An important Prerequisite for the good functioning of the above Elements is that the paper web (especially the ribbon) has achieved sufficient rigidity and tensile strength.

Advantageous refinements in this area Band guide device provided according to the invention are given in claims 3 to 5. Instead of or in addition to the blowing devices, Also perform suction rolls (in an arrangement similar to US 4,693,784) or suction conveyor belts (US 4,022,366) be provided.

In column 6, lines 1-30, DE '661 are measures described to in the known dryer section in End area of the one-felt dryer group the incoming Do not forward the ribbon immediately, but temporarily run into the basement (or into a reception facility) to let. Only after a stable run of the The single-felt dryer group then ties the Ribbon in the following aggregate or directly in the Two-felt dryer group forwarded. Regarding the Details are expressly referred to DE '661. Special embodiments of this invention Additional devices are specified in claim 6.  

Another aspect of the invention relates to advantageous Arrangements of the cylinders and felt guide rollers in Transition area between the last single felt Dryer group and the subsequent two-felt Drying group. It is particularly cheap if the train according to one of claims 7 to 10 substantially from above down the separation point between the two mentioned Dry groups can go through. Other possible Arrangements are given in claims 11 to 13.

Yet another aspect of the invention is concerned with the problem of reject paper removal occasionally in the event of a paper web tear arises. This danger can never be completely ruled out especially in the beginning of the dryer section, i.e. in the Area of single felt drying groups. The cheapest is if according to claim 14 all one-felt drying groups above are felted; then the paper scrap can be done very easily escape down under gravity. Here prepares the most common arrangement of the Cylinders in horizontal rows have no problems.

However, if possible - in order to achieve it more evenly Properties on both sides of the finished paper web - it is required that not only in the two-felt Dryer group but also in the area of single felt Drying group alternately with both sides of the paper web Dry cylinders come into contact, then a cylinder Arrangement in vertical or V-shaped rows especially advantageous. In this context, expressly the content of US-PS 5,050,317 (file P 4653) and DE OS 40 41 493 = US-PS 51 77 880 (file P 4784) pointed out. In the latter is, among other things, a dryer section Configuration protected with multiple V-shaped and above felted dryer groups as well as with two felted and arranged in the form of a V dryer groups, with between the bottom cylinders of these two dryer groups  Open the gap to remove scrap paper can.

If the above mentioned and in the one-felt Dryer groups need deflection rollers as suction rollers are formed, they can in a conventional manner be provided with an internal stationary suction box that can also serve to limit a desired suction zone. However, a construction is preferred according to claim 19 which the interior of the deflection suction rolls free of stationary installations. It is for generating Vacuum inside the roller also no hollow, for suction air cones required. Rather is (e.g. in the pocket between two neighboring ones Drying cylinders) an external suction box is provided, preferably according to patent application P 43 14 475.6 (file P 5145).

A final aspect of the invention is concerned with Problem of what height above a horizontal Reference plane the axes of rotation of the cylinders and / or Deflection rollers of the one-felt dryer group (s) advantageous be arranged, e.g. B. with regard to the necessary free evaporation path of the paper web between two Cylinders. Another aspect is the arrangement of these axes of rotation relative to the planes in which the Axes of rotation of the cylinders of the following two-felt Dry group. Are special in this regard advantageous solutions in claims 21 to 23 specified.

All of the various embodiments of the invention are common that in the end of the dryer section always at least one two-felt dryer group is present. This results in the following (some already above Advantages:

• 1. Uniform paper quality, especially same Surface properties on both sides of the paper.
• 2. Even if a very high final dryness is desired (98% order of magnitude), there is no risk of Paper web tears because the two-felt Drying group can relieve longitudinal stresses.
• 3. The one required at the end of the dryer section Tailors can be used in the two-felt dryer group easily arranged in the conventional way become.
• 4. At no point in the entire dryer section is there one Rope guide for pulling the ribbon required.
• 5. In the end area of known dryer sections, the only have one-felt dryer groups sometimes a relatively high wear of felt was observed, which is now due to the presence of the two felt Dryer group is avoided.

The invention is illustrated below using the drawings illustrated embodiments explained.

Figs. 1 to 4 show schematic side views of several different drying sections with multiple inputs felt drying groups and at least one subsequent two-felt drying group.

Figs. 5 to 8 show (as compared with FIGS. 1 through 4 are enlarged) are schematic side views of the transition zone between a single-felt drying group and a subsequent two-felt drying group with the associated Bändel guide means.

FIGS. 9 to 11 are similar to FIGS. 5 to 8 and show different height distances of the cylinder or deflecting roller axes from a reference plane.

FIGS. 12 and 13 show further embodiments in schematic side view.

. The dryer section shown in Figure 1 has six first tandem arrangement, single-felt dryer groups 11-16. Each of these dryer groups has a single endless felt F. For example, in the first dryer group 11 , the felt F runs together with the web 9 alternately over drying cylinders 51 and over deflection rollers 51 ', which are preferably designed as suction rollers. The underside of the web comes into contact with the cylinders in the first two dryer groups 11 and 12 and in the fourth and sixth dryer groups 14 , 16 . Accordingly, the drying cylinders 51 , 52 , 54 , 56 are above the associated deflection suction rollers 51 ', 52 ', 54 'and 56 '; the cylinders are "felted on top". The situation is different in the third dryer group 13 and in the fifth dryer group 15 : here the cylinders 53 , 55 come into contact with the top of the web; they are therefore "felted below" and lie below the associated deflection suction rollers 53 ', 55 '. Consequently, the separation points present between the drying groups 12 to 16 are designed as so-called turning separation points. With regard to the details of these turning separation points, reference is expressly made to patent application P 43 11 351 (file P 4953 K). It can be seen from FIG. 1 that the paper web 9 forms a short open train at each of these turning separation points; ie it is temporarily not supported by a felt. It runs in the area of a small suction zone of a transfer roller 58 onto the next felt in each case. In Fig. 1, these transfer rollers 58 are the only suction rollers with an internal stationary suction box. The deflection suction rollers 51 'to 56 ', on the other hand, are free of internal stationary installations and of direct suction connections. Instead, an external suction box 59 is provided on each of these deflection suction rolls. This lies in the so-called pocket located between two adjacent drying cylinders and has a strip 60 at the points where felt F and web 9 leave the first of these two cylinders together (see FIG. 7), which strips off and deflects the air boundary layer transported by the felt.

On the last one-felt dryer group 16 follows a two-felt dryer group 17 with some lower cylinders 57 and some upper cylinders 57 ', and with a bottom felt UF with an upper felt OF. Here the web 9 runs in a meandering pattern alternately over the lower and upper cylinders. In Fig. 1, a tip cutter S is indicated between the last two cylinders.

. The dryer section shown in Figure 2 for example, has three (or four or five) single-felt dryer groups 2-23; however, in contrast to FIG. 1, these are all felted above. In other words: All drying cylinders 71-73 touch the underside of the web. Another difference from Fig. 1 is that the deflection suction rollers 71 'to 73 ' have internal stationary suction boxes and are arranged only a short distance from the adjacent drying cylinders. Furthermore, two (or three) two-felt dryer groups 24 , 25 with lower cylinders 74 , 75 and with upper cylinders 74 'and 75 ' are now provided, for example.

. During the drying sections have according to Figures 1 and 2 only horizontal cylinder rows, the following is shown in Figures 3 and 4 are provided. In order to shorten the overall structural length of the dryer section, the cylinders of the single-felt drying groups, such as per se from known from DE 40 41 493, arranged in a plurality of rows inclined against the vertical direction, rows back and forth inclined alternating in succession. Referring to FIG. 3, two V-shaped double rows form a first dryer group 31 and a second dryer group 32. The cylinders 81 , 82 of these two dryer groups are felted at the top. This is followed by two dryer groups 33 , 34 felted below. The three (or four) cylinders 83 of the third dryer group, for example, form a backward inclined row. In contrast, the cylinders 84 of the fourth dryer group form a forward inclined row. A gap can be opened between the bottom cylinders of these two drying groups 33 , 34 by means of a pivotable felt guide roller 87 for the purpose of removing waste paper downwards. The fifth drying group 35 in turn has exclusively felted drying cylinders 85 , which in turn form a V-shaped double row. Behind the last cylinder of this dryer group 35 , the web is guided obliquely downwards to the first lower cylinder 86 of the subsequent two-felt dryer group 36 . According to Fig. 4 are exclusively felted above and V-shaped single-felt dryer groups 41, 42 and 43 are provided, followed by two two-felt dryer groups 44 and 45. In both FIGS. 3 and 4 - deviating from DE '493 - all deflection suction rolls 81 ' to 85 'and 91 ' to 93 ', which are arranged in the respective drying group between two cylinders, are arranged at an enlarged distance from these cylinders and with external suction boxes. This type of construction can not only be produced at lower costs; rather, it is also energy-saving; because there is an extended free evaporation path between every two cylinders, so that drying is more economical. The latter aspects also apply to the arrangement according to FIG. 1.

In Fig. 5 to Fig 2 seen from the drying section according to. The last two drying cylinders 73 of the last single-felt drying group 23 and the first three cylinders 74, 74 'of the two-felt drying group 24. Furthermore, one can see a deflection suction roller 73 'provided with an inner suction box and (deviate & from FIG. 2) a transfer suction roller 58 in front of the first lower drying cylinder 74 , likewise with a stationary inner suction box. An automatic rope-less ribbon guiding device is formed in the one-felt dryer group 23, for example, in that each deflection suction roll 73 has an edge suction zone known per se at one of its two ends. Air blowing devices, which are symbolically represented by arrows, are also provided on a scraper support body 76 , as well as an air blowing nozzle 79 . At the point where the web 9 and the felt F run together from the last cylinder 73 , an edge suction box R (web stabilizer or the like (which is effective only in the area of the belt) can be arranged. Or on the last cylinder 73 there is a short "ribbon guide scraper" 88 which only covers the ribbon area and which can also have an air blowing nozzle (e.g. DE-GM 89 14 679).

Also in the two-felt dryer group 24 , an automatic rope-less ribbon guide device is provided, which is designed as follows: Along the free path running from bottom to top to the cylinder 74 'runs on the one hand a wall of a scraper support body 77 and on the other hand Guide plate 78 , e.g. B. according to DE-GM 91 09 313. Each of these elements has blown air openings to expel a blown air jet substantially in the web running direction. Above the first lower cylinder 74 , the two felts F and OF run parallel to one another at a small distance a (a = approx. 30-50 mm). This prevents the upper felt OF from transporting large amounts of air into the pocket T, which escape laterally to the outside and would drive the incoming ribbon outwards. The arrangement shown ensures that the incoming ribbon is safely detected and forwarded by the first cylinder 74 '; it can also be used at the point of separation between two two-felt dryer groups (e.g. 24 , 25 , Fig. 2), both on the top felts and on the bottom felts.

If necessary, during the drawing-in first-Bändel following can be provided: In the last between the two cylinders 73 provided guide suction roll 73 'the vacuum is temporarily turned off; in addition, the air-blowing nozzle 79 is switched off, so that the ribbon initially runs down into the basement, as shown at 9 A. If the ribbon then runs stably through the preceding single-felt dryer groups, a new ribbon tip 9 B is formed by means of the blowing nozzle 79 and a knife 80 and this is guided to the deflection suction roller 73 ', which is again subjected to negative pressure. As a result, the ribbon now runs over to and through the two-felt dryer group 25 until the end of the dryer section. Such a device is also present in FIG. 7.

Referring to FIG. 6 of the inputs felt drying group 23 and the first lower cylinder is provided between the last cylinder 73 74 of the two-felt drying group next 24 are provided: a guide roll 18 of the felt F and a guide roll 19 of the bottom felt UF are arranged such that the felts overlap each other. During normal operation there is a certain distance between the felts F and UF, so that the web 9 runs freely, that is to say without support from the felt F, from the cylinder 73 to the felt guide roller 19 . During the pulling in of the ribbon, the guide roller 18 can be brought into the position shown with dash-dotted lines, so that the felts F and UF temporarily touch or almost touch each other. A ribbon scraper 88 can also be provided.

In Figs. 7 and 8, the first cylinder 94 'of the two-felt drying group is an upper cylinder. Therefore, a deflection suction roller 96 is provided between this and the last cylinder 93 of the single felt drying group. This can according to FIG. 7 in the loop of the felt F of the inputs felt drying group are located, the felt F is tangent to the upper cylinder 94 'and the web 9 to write to them. Referring to FIG. 8, the guide suction roll 96 'in the upper felt OF, the two-felt drying group are located. This felt touches the last cylinder 93 of the one-felt dryer group and removes the web from it. Clearly visible in Figs. 7 and 8 is again an automatic ropeless Bändel guide means, blow nozzles (symbolically shown by arrows) in the form of Bändel-Leitschabern 88 and in the form of, which are arranged on scraper support bodies 77 or on a separate blowpipe 87th An additional felt guide roller 100 (or an air scraper) can be provided so that the bottom felt UF running in the direction of the first upper cylinder 94 'does not unnecessarily convey air into the pocket T.

In Fig. 9 - compared to Fig. 1 - an increased distance H between the levels E1 and E2 is provided, whereby the web 9 between two cylinders of the single-felt dryer group is an enlarged evaporation distance available. The cylinder axes are in E1, the axes of the deflection suction rolls are in E2 and at least approximately the axes of the lower cylinders of the two-felt drying group.

Referring to FIG. 10 is - in contrast to Figures 1 and 2 - the following are provided:. The axes of the cylinders of the single-felt drying group are located in the same horizontal plane E1 as the axes of the upper cylinders of the two-felt drying group. Uniform stands 89 can thus be provided for all these cylinders. Furthermore, this means that the axes of the cylinders of the single-felt dryer group are at a greater height distance HO above a reference plane E0 than, for example, the axes of the cylinders 56 in FIG. 1. It follows that the height distance H between the deflection suction rolls and the cylinders is also very great can choose large if - compared to Fig. 9 - even larger evaporation distances between the cylinders are required. The axes of the deflection suction rolls (indicated by dash-dotted lines) can in turn lie at least approximately in the same horizontal plane E2 as the axes of the lower cylinders of the two-felt dryer group. The advantages described can be applied even more if, according to FIG. 11, the axes of the cylinders of the one-felt dryer group (plane E1) are arranged above the axes of the upper cylinders of the two-felt dryer groups (plane E3).

Fig. 12 shows an alternative to Fig. 1. The two-felt dryer group 17 A is designed according to DE-PS 36 23 971 (file P 4243) as follows: The paper web 9 runs first over a lower cylinder 61 , then one after the other two upper cylinders 62 , then successively via two lower cylinders 63 , then successively via two upper cylinders 64 , then successively via two lower cylinders 65 and finally via an upper cylinder 66 .

Between the cylinders of each pair of cylinders 62 - 65 , a deflection suction roller 62 '- 65 ' is arranged. As a result, the number of free paper web trains between the two horizontal rows of cylinders is approximately halved. The ribbon pulling can take place automatically, that is to say without ropes, just as explained above with reference to FIGS. 5 and 7. Any scrap paper is automatically transported to the rear end of dryer group 17 A and ejected there.

FIG. 13 shows that a felted one-felt dryer group 15 A can also be arranged immediately before a two-felt dryer group 16 A. According to another alternative, in the two-felt dryer group 16 A each lower cylinder 67 , 68 has its own felt FA, FB, in order to facilitate the removal of rejects.

Claims (25)

1. Drying section for drying a running web, preferably as part of a paper making machine, with the following features:

• a) in successive drying groups ( 11 - 17 ) are each a plurality of heatable and with the web ( 9 ) coming into contact drying cylinders ( 51 - 57 ');
• b) in the initial region of the drying section, at least one of the drying groups (11-16) are designed as single-felt drying group, in which a single endless felt (F) and the web (9) together, meandering, alternately over cylinders (51-56 ) and run over deflection rollers (preferably deflection suction rollers 51 ′ - 56 ′);
• c) at least one two-felt dryer group ( 17 ) is provided in the end region of the dryer section, in which the web ( 9 ) runs in a meandering manner, alternately over upper ( 57 ') and lower cylinders ( 57 ), preferably one free cylinder to cylinder (unsupported) train run exists;
• d) the at least one single-felt drying group (11-16) has for threading the so-called Bändels (ie, an edge strip of the web formed temporarily) an automatic rope-free Bändel guide means (79, 79 ');
• e) characterized in that in the or in the two-felt dryer group (s) ( 17 ) also an automatic rope-less guide device ( 77 , 78 ) is provided.

2. Drying section according to claim 1, characterized in that the drying cylinders of the single-felt drying group (s) (11-16) in the below-mentioned paper X% of the web contact area of the entire drying section form, so that at the end of the inputs Felt drying group (s) a web dry content Y% is reached: 3. Drying section according to claim 1 or 2, characterized in that the (in the or the two-felt drying group (s) existing) ribbon guide device ( 77 , 78 ) a known and the tip of the ribbon of cylinder ( 74 ) leading to cylinder ( 74 ') blowing device ( Fig. 5). 4. Drying section according to claim 3, characterized in that in the border edge zone at least one wall of a component (z. B. a scraper support body 77 ) extends substantially parallel to the free web running path and ejects a blown air jet substantially in the web running direction. 5. Dryer section according to claim 4, characterized in that one wall of a component (z. B. a scraper body ( 77 ) or a guide plate ( 78 )) extends substantially parallel to the free web running path in the edge of the ribbon on both sides of the free web running path , wherein at least one of the two walls ejects a blown air jet substantially in the direction of web travel. 6. Drying section according to one of claims 1 to 5, characterized in that in the end region of the single-felt drying groups ( 23 ) part of the ribbon guide device ( 79 ) can be switched off, so that the ribbon ( 9 A) arriving here temporarily the leaves normal web path, furthermore that devices ( 79 , 80 ) are provided there for the continuation and for the transverse cutting of the band ( FIG. 5). 7. Dryer section according to one of claims 1 to 6, characterized in that the last single-felt dryer group ( 16 ) is felted at the top (so that the underside of the web touches the cylinder). 8. Drying section according to claim 7, characterized in that the first cylinder ( 57 ) of the two-felt drying group ( 17 ) is a lower cylinder. 9. Drying section according to claim 8, characterized in that a substantially straight or a web path from the last cylinder ( 56 ) of the one-felt dryer group ( 16 ) to the first cylinder ( 57 ) of the two- Felt dryer group ( 17 ) is provided. 10. Drying section according to claim 9, characterized in that the web path touches a felt guide roller (for the bottom felt UF of the two-felt drying group 24 ) which is located directly in front of said first cylinder ( 74 ) and which is designed as a suction roller ( 58 ) can ( Fig. 5). 11. Drying section according to claim 7, characterized in that the first cylinder of the two-felt drying group ( 44 ; 16 A) is an upper cylinder ( Fig. 4 or 13), preferably (see Fig. 8) the upper felt (OF ) of the two-felt dryer group in front of the first cylinder ( 94 ') on top touches the last cylinder ( 93 ) of the one-felt dryer group and runs together with the web over a deflection roller ( 96 ') to the first upper cylinder ( 94 ') . 12. Drying section according to one of claims 1 to 6, characterized in that the last single-felt drying group ( 15 A) is felted below, so that the top of the web touches the cylinder ( Fig. 13). 13. Drying section according to claim 12, characterized in that the first cylinder of the two-felt drying group is a lower cylinder ( Fig. 8 on the head). 14. Drying section according to one of claims 1 to 13, characterized in that a plurality of single-felt drying groups (21-23; 41-43) are present which are all top felted. 15. Drying section according to one of claims 1 to 13, characterized in that a plurality of single-felt drying groups (11-16; 31 - 35) are provided, the first of which is at least top felted and of which at least one (13, 15 ; 33 , 34 ) is felted below. 16. Dryer section according to one of claims 1 to 15, characterized in that the cylinders of each one-felt dryer group are arranged in a substantially horizontal row of cylinders ( Fig. 1 or 2). 17. Drying section according to one of claims 1 to 15, characterized in that at least some of the cylinders in the area of the single-felt drying groups are arranged in a number of vertical rows or rows inclined against the vertical direction, rows back and forth inclined alternatingly ( Fig. 3 or 4). 18. Drying section according to claim 17, characterized in that a V-shaped double row is formed by two felting groups ( 33 , 34 ) felted below, between the bottom cylinders (by means of a movable felt guide roller 87 ) a gap can be opened for the purpose of removing scrap paper ( Fig. 3). 19. Drying section according to one of claims 1 to 18, characterized in that at least some of the deflection suction rolls ( 51 '- 56 ') have a rotatable roll body free of suction connections and an external suction box ( 59 ). 20. Drying section according to claim 19, characterized in that the external suction box ( 59 ) on the preceding cylinder has a deflection bar ( 60 ) for the air boundary layer brought up by the felt (F) ( Fig. 7). 21. Drying section according to claim 7, characterized in that the axes of the cylinders of the one-felt dryer group are at least approximately in the same horizontal plane (E1) as the axes of the upper cylinders of the two-felt dryer group (s) and that preferably for all of these cylinders are provided with stand ( 89 ) ( FIG. 10). 22. Drying section according to claim 7, characterized in that the axes of the cylinders of the one-felt dryer group lie in a horizontal plane (E1) which is arranged above the axes of the upper cylinders of the two-felt dryer group (s) ( Fig . 11). 23. Drying section according to claim 7, 21 or 22, characterized in that the axes of the deflection (suction) rollers of the one-felt dryer group lie at least approximately in the same horizontal plane (E2) as the axes of the lower cylinders of the two-felt Drying group (s) ( Fig. 9). 24. Drying section according to claim 1, characterized in that - in front of a first cylinder ( 74 ') of a two-felt drying group ( 24 ) - the felt (OF) running over this cylinder ( 74 ') at a small distance (a) runs parallel to a felt (F) of the preceding drying group ( 23 ) ( Fig. 5). 25. A method for pulling a band (ie a temporarily formed edge strip of a running web) into a drying section serving to dry the web, which in successive drying groups ( 11 - 17 ) comprises a plurality of heatable drying cylinders ( 51 that come into contact with the web ( 9 ) - 57 '), wherein the Bändel first means of an automatic rope-free Bändel guide means (79, 79') by at least one single-felt drying group (11 - 16 is passed), after which the tapes through at least one two-felt Passes through the drying group ( 17 ),
characterized in that the threading of the band into the two-felt dryer group ( 17 ) also takes place by means of an automatic rope-less band guiding device ( 77 , 78 ).