Machine and method for producing fibrous webs

Abstract

The invention relates to a machine for producing or treating a fibrous web (4), in particular a paper, cardboard or tissue web, comprising a drying section (1) comprising at least two consecutive double-row drying units (2, 3) having a plurality of drying cylinders (2.1, 2.2, 2.3, 3.1, 3.2), and a needle cutter for forming a transfer strip (4.1), wherein a separation point (5) is provided between at least two double-row drying units (2, 3) and a transfer device (6) is provided for transferring the transfer strip (4.1) from the end of a first double-row drying unit (2) to the end of a second double-row drying unit (2). A drying unit (3) characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separating position (5), and that the transfer device (6) comprises a guide element (7) having a substantially vertical longitudinal direction (7.7), and that the transfer device (6) is pivotably arranged about a pivot axis (7.3) in the region of the separating position (5) above the waste discharge device (12), so that the transfer strip (4.1) is transferred to the second double-row drying unit (3) by pivoting the guide element (7) from a rest position (7.5) into a transfer position (7.6). The invention also relates to a method for guiding a fibrous web in a machine for producing or treating fibrous webs.

Description

Technical Field

[0001] The invention relates to a machine for producing or treating a fibrous web, in particular a paper, cardboard or tissue web, comprising a drying section comprising at least two consecutive double-row drying groups with a plurality of drying cylinders and a needle cutter for forming a transfer strip, wherein a separation point is provided between at least two double-row drying groups and a transfer device is provided for transferring the transfer strip from the end of a first double-row drying group to a second double-row drying group.

[0002] The invention also relates to a transfer device and a method for transferring. Background Art

[0003] This type of equipment is known. Document DE 102011089508 A1 describes a drying section for a machine for producing or processing fibrous webs. This drying section comprises two double-row drying units with a separation point formed between them for separating the web run and transfer. The drying section also comprises a transfer system for transferring the fibrous web strips. This transfer system includes a rope arrangement for transferring the transfer strips. The transfer strips are guided laterally from the drying section and directed to the rope shears of the rope arrangement, where they are then guided by ropes to the next machine unit.

[0004] The known system has several disadvantages. The ropes must be frequently checked for wear and tear, and thus pose a risk to the operator in the event of a rope breakage. Due to the large number of necessary components, such as ropes, rope tensioners, pulleys, etc., the known solution is also very expensive to purchase, operate, and maintain. Furthermore, the known solution offers only inadequate reliability during the transport of the web, particularly at high machine speeds and with high weights per unit area of ​​the fibrous web. Summary of the Invention

[0005] The object of the present invention is therefore to provide a machine with a drying section and a transfer device as well as a method for transfer which do not have the disadvantages of the known solutions and which represent a reliable and economical solution.

[0006] The technical problem is solved by a machine with a drying section according to the invention. A machine for producing or treating a fibrous web, in particular a paper, cardboard or tissue web, is proposed, the machine having a drying section comprising at least two consecutive double-row drying groups with a plurality of drying cylinders and a needle cutter for forming a transfer strip, wherein a separation point is provided between the at least two double-row drying groups and a transfer device is provided for transferring the transfer strip from the end of a first double-row drying group to a second double-row drying group. According to the present invention, at least the transfer strip is guided into a waste discharge device arranged below the separation position, and the transfer device comprises a guide element having a longitudinal direction extending essentially vertically, and the transfer device is pivotably arranged about a pivot axis in the region of the separation position above the waste discharge device, so that the transfer strip is transferred to the second double-row drying unit by pivoting the guide element from the stationary position to the transfer position, and the transfer strip is transferred between the mesh cloth guided around the first guide roller of the second double-row drying unit and the outer cover surface of the first drying cylinder of the second double-row drying unit, and the guide element comprises a main region and an end region, wherein the end region is connected to the main region or is constructed as an end element separated from the main region, and the end region comprises a cutting edge, in particular a serrated cutting edge, designed to cut the transfer strip.

[0007] Furthermore, the present invention can also be applied to a drying section comprising at least two drying units, wherein the first drying unit is designed as a single row and the second drying unit is designed as a double row.

[0008] The technical problem is also solved by a transfer device according to the invention. A transfer device is proposed for the dryer section of a machine for producing or processing a fibrous web, in particular a paper, cardboard or tissue web, the transfer device comprising an upper drying cylinder and a lower drying cylinder and a needle cutter for forming a transfer strip, wherein a separation point is formed between the upper drying cylinder and the lower drying cylinder, and wherein a transfer device is provided for transferring the transfer strip from the upper drying cylinder to the lower drying cylinder. According to the present invention, at least the transfer strip is guided into a waste discharge device arranged below the separation position, and the transfer device comprises a guide element having a longitudinal direction extending essentially vertically, and the transfer device is pivotably arranged about a pivot axis in the region of the separation position above the waste discharge device, so that the transfer strip is transferred to the drying cylinder below by pivoting the guide element from the stationary position to the transfer position, so that the transfer strip is transferred between the mesh guided around the first guide roller of the second double-row drying unit and the outer cover surface of the first drying cylinder of the second double-row drying unit, and the guide element comprises a main region and an end region, wherein the end region is connected to the main region or is constructed as an end element separated from the main region, and the end region comprises a cutting edge, in particular a serrated cutting edge, designed to cut the transfer strip.

[0009] The pivot axis is preferably arranged in the immediate vicinity below the doctor bar of the doctor blade associated with the upper drying cylinder.

[0010] In some cases, the guide element can be designed as a surrounding belt or vacuum belt.

[0011] The needle cutter for forming and widening the transfer strip can be arranged in the first of the two double-row drying units or further upstream in the production process, as viewed in the direction of machine operation, for example at the beginning of the drying section, press section, or forming section of the machine. If multiple separation points are provided in the drying section, this allows the transfer strip to be guided through multiple separation points without having to provide a needle cutter for each separation point.

[0012] During the pivoting process about the pivot axis of the guide device starting from the rest position and ending in the transfer position, the pivot axis is preferably oriented horizontally and transversely to the machine direction of travel. Therefore, the transfer strip is not spread out laterally and its running path roughly corresponds to the running path of the fibrous web in normal operation.

[0013] This is advantageous in particular for machine speeds of more than 800 m / min (meters / minute), in particular more than 1000 m / min, preferably more than 1200 m / min.

[0014] Likewise, the present invention enables reliable web guidance and transfer of the fibrous web at higher weights per unit area of ​​more than 130 g / m2 (grams per square meter), in particular more than 160 g / m2 and preferably more than 200 g / m2 or even more than 250 g / m2.

[0015] The invention is particularly advantageous for the production of, for example, folding board or plasterboard and for board types which are at least partially made from waste paper and thus have a lower breaking strength. Thus, a gentle transfer of the transfer strip has an advantageous effect.

[0016] Furthermore, the invention is also effective for papers with very high breaking strength, such as virgin fiber board.At the beginning of the transfer process, the transfer strip can be cut particularly reliably by moving the guide element from the rest position to the transfer position to form the beginning of the transfer strip.

[0017] In practice, the transfer strip is transferred between the clothing of the second double-row drying unit guided around the first guide roller, preferably the lower clothing of the second drying unit and the outer cover of the first drying cylinder of the second double-row drying unit.

[0018] The guide element can comprise a main region and an end region in the longitudinal direction, wherein the end region, when pivoted into the transfer position, passes the first guide roller at a distance therefrom.

[0019] The end region can have a cutting edge, in particular a serrated cutting edge, for cutting the transfer strip. In this way, even with a high strength and basis weight of the fibrous web, the transfer strip can be cut particularly reliably at the beginning of the transfer process by moving the guide element from the rest position to the transfer position to form the beginning of the transfer strip (also called the tail).

[0020] In another possible embodiment, the main region and the end regions may not be connected but rather separate. In this case, the guide element comprises the main region without the end regions. The end regions are formed by end elements that can pivot and translate independently of the guide element. This allows for separate guiding of the transfer strip and cutting to form the beginning of the transfer strip, thereby optimizing these sub-functions.

[0021] Preferably, the guide element extends substantially from the scraper bar carrying the scraper blade to the first guide roller of the second double-row drying unit.

[0022] The distance is preferably in the range of 20 mm to 400 mm, in particular 50 mm to 300 mm, preferably 100 mm to 150 mm. This ensures a reliable transfer.

[0023] In an advantageous embodiment, the end region of the guide element is rigidly or pivotally connected to the main region. In some cases, a pivotable connection can be advantageous for adapting the web path to the geometry of the start of the second drying unit. The advantage of the pivotable design is that, in the event of a break, the web can be transported smoothly to the waste discharge 12 and reliably.

[0024] The end region can also be arranged at an angle relative to the main region.

[0025] Furthermore, it is possible that the main area is connected to the pivot axis and is provided with a blowing nozzle in order to generate an air flow between the guide element and the fibrous web along the main area in the direction of the end area of ​​the guide element, i.e. in the longitudinal direction of the guide element. The transfer of the transfer strip is thereby supported.

[0026] In a possible practical embodiment, the blow nozzle is designed to have a diameter in the range of 0.5 mm to 5 mm, preferably between 1.5 mm and 2 mm and applies compressed air in the range of up to 12 bar to generate an air flow with a speed equal to or greater than the speed of the fiber web or transfer strip.

[0027] The air flow can be steady, constant or pulsating.

[0028] For stabilization by flow forces, the guide element, in particular the main region in the direction of the end region of the guide element, can also be designed to be flat or convex or concave toward the transport strip.

[0029] Furthermore, it is advantageous if the longitudinal direction of the guide element in the rest position is angled relative to the vertical by more than -5°, preferably more than -10°, and in particular more than -15°. The guide element is thus slightly pivoted against the direction of machine operation. This ensures free space from the removal point where the scraper removes the fibrous web or transfer strip from the last drying cylinder of the first double-row drying unit to the waste discharge, allowing the fibrous web or transfer strip to be guided unhindered into the waste discharge.

[0030] The longitudinal direction of the guide element has an angle of more than 10°, preferably 15°, relative to the vertical in the transfer position. This promotes a gentle deflection and transfer of the transfer strip.

[0031] Furthermore, the guide element, in particular the main region, can have a spacing in the range of 50 mm to 400 mm, in particular 50 mm to 200 mm, relative to the first drying cylinder of the second double-row drying unit in the transfer position. This improves reliable transfer.

[0032] Advantageously, the end region of the guide element in the transfer position has a spacing of between 20 mm and 400 mm, in particular between 20 mm and 200 mm, relative to the first drying cylinder of the second double-row drying unit. This short spacing improves the secure reception of the transfer strip by the lower clothing of the second double-row drying unit and the outer cover of the first drying cylinder of the second double-row drying unit.

[0033] The first guide roller is preferably positioned below the first drying cylinder of the second double-row drying unit so that it does not intersect a vertical tangent to the first drying cylinder of the second double-row drying unit and is preferably offset by a distance in the machine direction ranging from 0 mm to 300 mm. Viewed from above, the first guide roller is positioned in the shadow of the first drying cylinder. This ensures that the fibrous web or transfer strip is guided unimpeded to the waste discharge, preventing accumulation.

[0034] Advantageously, a cutting blade, preferably covering the width of the machine, is provided for slitting the fibrous web while the machine is running. During machine operation, if there are downstream interruptions in production, targeted slitting of the fibrous web may be necessary. This eliminates the need for a complete transfer of the fibrous web. In this case, the transfer device therefore includes the cutting blade.

[0035] In a possible embodiment, the cutting knife for cutting can be moved in the direction of the fibrous web, preferably in a pulsed manner with a pulse time of 0.01s to 2s, in particular 0.2s to 0.7s. Operational malfunctions caused by paper jams can be avoided by the pulsed ejection and retraction of the cutting knife.

[0036] The cutting blade for cutting can be moved obliquely downward in the direction of the fibrous web at a movement angle of −45° to +45°, preferably 5° to 30°, relative to an imaginary horizontal line.

[0037] In order to improve the waste removal, a machine-wide blow pipe is provided in the region of the cutting blades in order to assist in the discharge of the fibrous web into the waste removal device.

[0038] The technical problem is also solved by a method for transferring a fibrous web between at least two double-row drying groups in the dryer section of a machine for producing or processing a fibrous web, in particular a paper, board or tissue web, the double-row drying groups having a plurality of drying cylinders. A separation point is provided between the at least two double-row drying groups, and a transfer strip is separated from the fibrous web by a needle cutter and transferred from the end of a first double-row drying group to a second double-row drying group by a transfer device arranged in the region of the separation point. The present invention is characterized in that at least the transfer strip is guided into a waste discharge device arranged below the separation position, and the transfer device includes a guide element having a longitudinal direction extending essentially vertically, and the transfer device is arranged in the area of ​​the separation position above the waste discharge device, and the guide element is pivoted from a stationary position to a transfer position about a pivot axis, thereby transferring the transfer strip to the second double-row drying unit, so that the transfer strip is transferred between the mesh cloth guided around the first guide roller of the second double-row drying unit and the outer cover surface of the first drying cylinder of the second double-row drying unit, and the guide element includes a main area and an end area, wherein the end area is connected to the main area or is constructed as an end element separated from the main area, and the end area includes a cutting edge, in particular a serrated cutting edge, designed to cut the transfer strip.

[0039] The technical problem is also solved by a method for transferring a fibrous web between an upper drying cylinder and a lower drying cylinder in a machine for producing or processing fibrous webs, in particular paper, cardboard or tissue webs, wherein a separation point is provided between the upper drying cylinder and the lower drying cylinder, wherein a transfer strip is separated from the fibrous web by a needle cutter, and wherein a transfer device is provided for transferring the transfer strip from the upper drying cylinder to the lower drying cylinder, characterized in that at least the transfer strip is guided into a waste discharge device arranged below the separation point, and the transfer device comprises a guide having a vertically extending longitudinal direction. An element, the guide element is pivotally arranged around a pivot axis in the area of ​​the separation position above the waste discharge device, so that the guide element is pivoted from the static position to the transfer position, so that the transfer strip is transferred to the drying cylinder below, so that the transfer strip is transferred between the mesh guided around the first guide roller of the second double-row drying unit and the outer cover surface of the first drying cylinder of the second double-row drying unit, and the guide element includes a main area and an end area, wherein the end area is connected to the main area or is constructed as an end element separated from the main area, and the end area includes a cutting edge, in particular a serrated cutting edge, designed to cut the transfer strip.

[0040] In practice, the transfer strip can be formed after the machine is restarted.

[0041] It is also conceivable that the fibrous web is cut to the machine width while the machine is running and then forms the transfer strips.

[0042] The drying section of the machine can be designed with multiple separation points between each pair of double-row drying units, each of which has a transfer device, and the guide elements of these transfer devices are all pivoted simultaneously or successively into the transfer position before transfer. Furthermore, the needle cutter is arranged upstream of the first of the multiple separation points in the machine's direction of operation. The transfer strip produced by the needle cutter is transferred through the multiple separation points. This is an economically advantageous solution.

[0043] It is therefore advantageous if the transport strip is guided through at least two separation points and subsequently widened.

[0044] It is also conceivable that the machine is designed with a plurality of separation positions located between each two double-row drying units, and each separation position has the transfer device, and the guide elements of these transfer devices are all pivoted to the transfer position simultaneously or successively before the transfer, and the needle cutter is arranged upstream of each of the plurality of separation positions (5) in the direction of machine operation.

[0045] In a possible alternative step, after each separation point, the transfer strip is widened, in particular by means of a needle cutter which is movable transversely to the grain direction.

[0046] The invention also explicitly extends to embodiments which are not given by combinations of features explicitly mentioned in the description, whereby the features disclosed in the invention can be combined with one another in any manner as long as this is technically useful. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Further features and advantages of the present invention emerge from the following description of preferred embodiments with reference to the accompanying drawings.

[0048] In the accompanying drawings

[0049] Figure 1 A simplified schematic diagram showing an embodiment of the machine according to the invention in an operating state;

[0050] Figure 2 Show the basis Figure 1 A simplified schematic diagram of an embodiment of the machine according to the invention in the event of an interruption in operation;

[0051] Figure 3 Show the basis Figure 1 A simplified schematic diagram of an embodiment of the machine according to the invention during a transfer process;

[0052] Figure 4 Show the basis Figure 3 A simplified schematic diagram of an embodiment of the machine according to the invention with a single row of first drying units during transfer; DETAILED DESCRIPTION

[0053] Figure 1 A simplified schematic diagram shows an embodiment of a machine according to the present invention for producing or processing a fibrous web 4 in normal operation. The machine is suitable for producing and transferring fibrous webs 4 having a weight per unit area exceeding 130 g / m², in particular fibrous webs made at least partially from waste paper, at machine speeds exceeding 800 m / min. A detail of a drying section 1 is shown, comprising two consecutive double-row drying units 2 and 3, each with drying cylinders 2.1, 2.2, 2.3, 3.1, and 3.2. The machine also comprises at least one needle cutter (not shown) for forming a transfer strip 4.1. A separation point 5 is formed between the at least two double-row drying units 2 and 3. A transfer device 6 is provided in the separation point 5 for transferring the transfer strip 4.1 from the end of the first double-row drying unit 2 to the second double-row drying unit 3. A waste discharge device 12 is arranged below the separation point 5. Depending on the operating situation, the fibrous web 4, the transfer strip 4.1, or the residual web 4.2 is guided into the waste discharge 12. The transfer device 6 includes a guide element 7 having a substantially vertical longitudinal direction 7.7. This guide element is pivotably arranged about a pivot axis 7.3 in the area of ​​the separation point 5 above the waste discharge 12. The last drying cylinder 2.3 of the first double-row drying unit 2 is equipped with a scraper 14 having a scraper blade and a scraper shaft. The pivot axis 7.3 is located below and near the scraper 14. The guide element 7 extends downward from the pivot axis 7.3 to the first guide roller 3.3 of the second double-row drying unit 3. This creates a very long guide path at the edge of the separation point 5 for the fibrous web 4 and the transfer strip 4.1, ensuring reliable transfer. The guide element 7 comprises a main area 7.1 and an end area 7.2 connected to the main area 7.1. The main area 7.1 is connected upward to the pivot axis 7.3. The width of the guide element 7 is in the range of 100 mm to 500 mm, preferably 200 mm to 300 mm and therefore corresponds to the possible width range of the transfer strip 4.1. The end region of the guide element 7 can be rigidly or pivotably connected to the main region 7.1. In some cases, a pivotable connection may be advantageous for adapting the web running path of the transfer strip to the geometry of the starting end of the second drying unit 3. In the case of a pivotable end region 7.2, this end region can be connected to an electric, hydraulic or pneumatic actuator. The advantage of the pivotable design is that in the event of a break the web runs undisturbed into the waste discharge device 12 and is transferred reliably. Figure 1 Figure 2 shows normal operation during the production of a fibrous web 4. The fibrous web 4 is guided in a zigzag pattern across the machine width around the upper and lower drying cylinders 2.1, 2.2, 2.3, 3.1, and 3.2, along with the corresponding drying wires 2.5, 2.6, 3.5, and 3.5. Between the upper and lower drying wires, the fibrous web 4 is unsupported and guided in a free-drawing manner. The guide element 6 is in a rest position 7.5 and is pivoted longitudinally at an angle WR exceeding -5° relative to the vertical 10 and counter to the machine direction 13. This ensures that, in the event of a web break, no residue of the fibrous web 4 accumulates on the guide element 6. The first drying cylinder 3.1 of the second drying unit 3 forms an entry gap with the clothing 3.6 guided around the first guide roller 3.3. During the transfer process, the transfer strip 4.1 is guided into this entry gap by the guide element 7. The first guide roller 3.3 is arranged below the first drying cylinder 3.1 of the second drying unit 3. Here, the first guide roller 3.3 is offset in the machine direction 13 to such an extent that the outer shell of the first guide roller 3.3 does not intersect a vertical tangent to the first drying cylinder 3.1. Figure 1 In the first drying drum 3.1, the first guide roller 3.3 is offset by a distance AVS of up to 300 mm. Viewed from above, the first guide roller 3.3 lies in the shadow of the first drying cylinder 3.1. This ensures that the fibrous web 4 or the transfer strip 4.1 is guided unimpeded into the waste discharge 12. Accumulation is avoided. Consequently, combined with the idle position 7.5 of the guide element 6, the free space in the area of ​​the separation position is free of obstructions. This facilitates undisturbed guidance of the web into the waste discharge 12. A cutting blade 8, covering the machine width, is located above the first drying drum 3.1 of the second drying unit 3 for slitting the fibrous web 4. The cutting blade 8 can be moved downwardly at an angle BW of greater than 5° relative to the imaginary horizontal, in the direction of the fibrous web 4. The time for the cutting blade's forward and backward movement is designed to be very fast, in a pulsed manner, to avoid blockages. The pulse time is in the range of 0.01 to 2 seconds. To improve the waste removal, a blow pipe 11 is arranged across the machine width in the region of the cutting blade 8 in order to assist in the discharge of the fibrous web 4 into the waste removal device.

[0054] Figure 1 、 Figure 2 and Figure 3 The drying section 1 in FIG. 1 corresponds to one another. However, different operating situations are shown. For the sake of clarity, some reference numerals are not marked in all figures. Therefore, reference numerals of elements that correspond to one another may be transferred between these figures.

[0055] Figure 2 Show the basis Figure 1The present invention relates to an embodiment of a machine for producing or processing a fibrous web 4 in the operating state after slitting or during machine startup. In the operating state after slitting by the cutting blade 8, the fibrous web 4 is guided undisturbed into the waste discharge 12. If the transfer strip 4.1 has already been formed upstream by the needle cutter, the transfer strip 4.1 and the residual web 4.2 are also guided undisturbed into the waste discharge because the guide element 7 is in the idle position. When the machine is restarted, the web guided into the waste discharge 12 may be the fibrous web 4 or the transfer strip 4.1 or the residual web 4.3, or both. This depends on whether the transfer strip was cut by the needle cutter and transferred, or cut, transferred, and then widened, in the corresponding preceding separating point 5.

[0056] Figure 3 The figure shows the situation during the transfer process. The guide element 7 has been moved by the actuator 7.4 from the rest position 7.5 to the transfer position 7.6. During this process, the transfer strip 4.1 is cut, forming the beginning of the transfer strip, and transferred into the entry gap between the lower clothing of the second double-row drying unit 3, which is guided around the first guide roller, and the outer surface of the first drying cylinder 3.1 of the second drying unit. The transfer strip 4.1 is firmly grasped and transferred through this entry gap. The pivot axis 7.3 is oriented horizontally and transversely to the machine direction 13. Therefore, the transfer strip 4.1 does not deviate laterally, and its travel path generally corresponds to the travel path of the fibrous web 4 during normal production operation of the machine. During the pivoting process of the guide element 7, the end region passes the first guide roller 3.3 at a distance AEL between 20 mm and 400 mm when pivoting into the transfer position. In the transfer position, the longitudinal direction 7.7 of the main region 7.1 of the guide element 7 is at an angle WU of more than 10° relative to the vertical. This facilitates gentle deflection and diversion of the transfer strip 4.1. Furthermore, in the transfer position 7.6, the guide element 7, in particular the main region 7.1, is at a distance ALZ of 50 mm to 400 mm relative to the first drying cylinder 3.1 of the second double-row drying unit 3. The main region 7.1 is connected to the pivot axis 7.3 and is provided with a blower nozzle for generating an air flow between the guide element 7 and the transfer strip 4.1 along the main region 7.1 in the direction of the end region 7.2, i.e., in the longitudinal direction 7.7 of the guide element 7.

[0057] Figure 4 A simplified schematic diagram showing Figure 3 The design of the drying section 1 corresponds to the embodiment of the machine according to the invention during the transfer process. Figures 1 to 3The drying section 1 shown differs in that the first drying unit 2' is designed as a so-called single-row drying unit. The drying cylinders 2.3 are arranged in a row, and the fibrous web 4 is guided in a zigzag manner and alternately between the drying cylinders 2.3 in the drying wire suction rollers 2" arranged in a row below the drying cylinders together with the drying wire 2.7. To stabilize the web run, a web stabilizer 15 is arranged above the drying wire suction rollers 2". At the last drying cylinder 2.3, the drying wire 2.7 is withdrawn and the fibrous web 4 follows the last drying cylinder 2.3 of the first drying unit 2'. Subsequently, the fibrous web 4 is removed from the last drying cylinder 2.3 of the first drying unit 2' by the upper drying wire 3.5 of the second drying unit 3, guided around the drying wire suction rollers 2" and directed to the upper first drying cylinder 3.1 of the second double-row drying unit 3. The operating conditions that occur in this modified drying section 1 are similar to those described with respect to Figures 1 to 3 Likewise, the elements involved in guiding and transferring the fibrous web 4 and the transfer strip 4.1 as well as the residual web 4.2 are identical to those in Figures 1 to 3 The elements shown and described herein correspond to those in FIG.

[0058] Reference Signs List

[0059] 1 Drying section

[0060] 2The first double row drying unit

[0061] 2' first single row drying unit

[0062] 2" Drying Wire Suction Roll

[0063] 2.1 Drying Cylinder

[0064] 2.2 Drying Cylinder

[0065] 2.3 Final drying cylinder

[0066] 2.4 Guide roller

[0067] 2.5 Upper drying net

[0068] 2.6 Lower drying screen

[0069] 2.7' drying fabric

[0070] 3. Second double row drying unit

[0071] 3.1 First drying cylinder

[0072] 3.2 Drying Cylinder

[0073] 3.3 First guide roller

[0074] 3.4 Guide roller

[0075] 3.5 Upper drying screen

[0076] 3.6 Drying net and blanket below

[0077] 4Fiber web

[0078] 4.1 Transfer Strip

[0079] 4.2 Residual format

[0080] 5 separation position

[0081] 6Transfer device

[0082] 7 Guiding elements

[0083] 7.1 Main Area

[0084] 7.2 End region

[0085] 7.3 Pivot axis

[0086] 7.4 Actuator

[0087] 7.5 Rest position

[0088] 7.6 Transfer Location

[0089] 7.7 Vertical

[0090] 8 cutting knives

[0091] 9 horizontal lines

[0092] 10 vertical lines

[0093] 11 Blowing pipe

[0094] 12 Waste discharge device

[0095] 13 Machine running direction

[0096] 14 scraper

[0097] 15-frame stabilizer

[0098] AVS guide roller offset

[0099] Distance of the AEL end area relative to the first guide roller

[0100] Distance of the AEZ end area relative to the first drying cylinder

[0101] Distance of the ALZ guide element relative to the first drying cylinder

[0102] WR resting position angle

[0103] WU Angle of transfer position

[0104] BW moving angle

Claims

1. A machine for producing or treating a fibrous web (4), comprising a drying section (1) comprising at least two consecutive double-row drying units (2, 3) having a plurality of drying cylinders (2.1, 2.2, 2.3, 3.1, 3.2), and a needle cutter for forming a transfer strip (4.1), wherein: A separation position (5) is provided between at least two double-row drying units (2, 3) and a transfer device (6) is provided for transferring the transfer strip (4.1) from the end of the first double-row drying unit (2) to the second double-row drying unit (3), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation position (5), and the transfer device (6) comprises a guide element (7) having a vertically extending longitudinal direction (7.7), and the transfer device (6) is pivotally arranged about a pivot axis (7.3) in the region of the separation position (5) above the waste discharge device (12), so that the transfer strip (4.1) can be transferred from a stationary position to a waste discharge device (12) by means of the guide element (7). The guide element (7.5) is pivoted into a transfer position (7.6) so that the transfer strip (4.1) is transferred to the second double-row drying unit (3), the transfer strip (4.1) is transferred between a mesh (3.6) guided around a first guide roller (3.3) of the second double-row drying unit (3) and an outer cover surface of the first drying cylinder (3.1) of the second double-row drying unit (3), and the guide element (7) comprises a main area (7.1) and an end area (7.2), wherein the end area (7.2) is connected to the main area (7.1) or is constructed as an end element separated from the main area (7.1), and the end area (7.2) comprises a cutting edge designed to cut the transfer strip (4.1).

2. The machine according to claim 1, characterized in that The fibrous web (4) is a paper web, a cardboard web or a tissue web.

3. The machine according to claim 1, characterized in that The cutting edge is a serrated cutting edge.

4. The machine according to claim 1, characterized in that The end element, which is constructed separately from the main region (7.1), is capable of pivoting and translating independently of the guide element (7).

5. The machine according to claim 1, characterized in that The guide element (7) comprises a main region (7.1) and an end region (7.2) in the longitudinal direction (7.7), wherein the end region (7.2) passes the first guide roller (3.3) at a distance (AEL) from the first guide roller when pivoted into the transfer position (7.6).

6. The machine according to claim 5, characterized in that The distance (AEL) is in the range of 20 mm to 400 mm.

7. The machine according to claim 6, characterized in that The distance (AEL) is in the range of 50 mm to 300 mm.

8. The machine according to claim 7, characterized in that The distance (AEL) is in the range of 100 mm to 150 mm.

9. The machine according to claim 1, characterized in that The end region (7.2) of the guide element (7) is rigidly or pivotably connected to the main region (7.1).

10. The machine according to claim 1, characterized in that The main region (7.1) is connected to the pivot axis (7.3) and is provided with a blowing nozzle in order to generate an air flow between the guide element and the transfer strip along the main region (7.1) in the direction of the end region (7.2) of the guide element (7).

11. The machine according to claim 1, characterized in that The longitudinal direction (7.7) of the guide element (7) has an angle (WR) of more than -5° relative to the vertical (10) in the rest position (7.5).

12. The machine according to claim 11, characterized in that The included angle (WR) is greater than -10°.

13. The machine according to claim 12, characterized in that The included angle (WR) is greater than -15°.

14. The machine according to claim 1, characterized in that The longitudinal direction (7.7) of the guide element (7) has an angle (WU) of more than 10° relative to the vertical (10) in the transfer position (7.6).

15. The machine according to claim 14, characterized in that The included angle (WU) is 15°.

16. The machine according to claim 1, characterized in that In the transfer position (7.6), the guide element (7) has a distance (ALZ) in the range of 50 mm to 400 mm relative to the first drying cylinder (3.1) of the second double-row drying unit (3).

17. The machine according to claim 1, characterized in that In the transfer position (7.6), the main area (7.1) has a distance (ALZ) in the range of 50 mm to 400 mm relative to the first drying cylinder (3.1) of the second double-row drying unit (3).

18. The machine according to claim 16 or 17, characterized in that The distance (ALZ) is in the range of 50 mm to 200 mm.

19. The machine according to claim 1, characterized in that The end region (7.2) of the guide element (7) has a distance (AEZ) of between 20 mm and 400 mm relative to the first drying cylinder of the second double-row drying unit (3) in the transfer position (7.6).

20. The machine according to claim 19, characterized in that The distance (AEZ) is between 20 mm and 200 mm.

21. The machine according to claim 1, characterized in that The first guide roller (3.3) is arranged below the first drying cylinder (3.1) of the second double-row drying unit (3), so that the first guide roller does not intersect with a vertical tangent line of the first drying cylinder (3.1) of the second double-row drying unit (3).

22. The machine according to claim 21, characterized in that The first guide roller is offset in the machine direction (13) by a distance (AVS) in the range of 0 mm to 300 mm.

23. The machine according to claim 1, characterized in that A cutting knife (8) is provided for cutting the fibrous web (4) during operation of the machine.

24. The machine according to claim 23, characterized in that The cutting blade (8) has a machine width.

25. A transfer device for the drying section (1) of a machine for producing or processing a fibrous web (4), the transfer device comprising an upper drying cylinder (2.3) and a lower drying cylinder (3.1) and a needle cutter for forming a transfer strip (4.1), wherein: A separation point (5) is formed between an upper drying cylinder (2.3) and a lower drying cylinder (3.1), wherein a transfer device (6) is provided for transferring the transfer strip (4.1) from the upper drying cylinder (2.3) to the lower drying cylinder (3.1), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation point (5), and the transfer device (6) comprises a guide element (7) with a vertically extending longitudinal direction (7.7), and the transfer device (6) is pivotably arranged about a pivot axis (7.3) in the region of the separation point (5) above the waste discharge device (12), so that the transfer strip (4.1) is guided by the guide element (7) Pivoting from a rest position (7.5) to a transfer position (7.6) so that the transfer strip (4.1) is transferred to the drying cylinder (3.1) below, so that the transfer strip (4.1) is transferred between a mesh (3.6) guided around a first guide roller (3.3) of the second double-row drying unit (3) and an outer cover surface of the first drying cylinder (3.1) of the second double-row drying unit (3), and the guide element (7) comprises a main area (7.1) and an end area (7.2), wherein the end area (7.2) is connected to the main area (7.1) or is constructed as an end element separated from the main area (7.1), and the end area (7.2) comprises a cutting edge designed to cut the transfer strip (4.1).

26. The transfer device according to claim 25, characterized in that The fibrous web (4) is a paper web, a cardboard web or a tissue web.

27. The transfer device according to claim 25, characterized in that The cutting edge is a serrated cutting edge.

28. A method for transferring a fibrous web (4) between at least two double-row drying groups (2, 3) of a drying section (1) of a machine for producing or treating fibrous webs, the double-row drying groups having a plurality of drying cylinders (2.1, 2.2, 2.3, 3.1, 3.2), wherein: A separation position (5) is provided between at least two double-row drying units (2, 3), wherein a transfer strip (4.1) is separated from a fiber web (4) by a needle cutter, and the transfer strip (4.1) is transferred from the end of the first double-row drying unit (2) to the second double-row drying unit (3) by a transfer device (6) arranged in the region of the separation position (5), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation position (5), and the transfer device (6) comprises a guide element (7) having a vertically extending longitudinal direction (7.7), and the transfer device (6) is arranged in the region of the separation position (5) above the waste discharge device (12), and the guide element The guide element (7) is pivoted about a pivot axis (7.3) from a rest position (7.5) to a transfer position (7.6), thereby transferring the transfer strip (4.1) to the second double-row drying unit (3), so that the transfer strip (4.1) is transferred between a mesh (3.6) guided around a first guide roller (3.3) of the second double-row drying unit (3) and an outer cover surface of the first drying cylinder (3.1) of the second double-row drying unit (3), and the guide element (7) comprises a main area (7.1) and an end area (7.2), wherein the end area (7.2) is connected to the main area (7.1) or is constructed as an end element separated from the main area (7.1), and the end area (7.2) comprises a cutting edge designed to cut the transfer strip (4.1).

29. The method according to claim 28, characterized in that The fibrous web (4) is a paper web, a cardboard web or a tissue web.

30. The method according to claim 28, wherein The cutting edge is a serrated cutting edge.

31. A method for transferring a fibrous web (4) between an upper drying cylinder (2.3) and a lower drying cylinder (3.1) in a machine for producing or processing fibrous webs, wherein: A separation point (5) is provided between an upper drying cylinder (2.3) and a lower drying cylinder (3.1), wherein a transfer strip (4.1) is separated from the fiber web (4) by means of a needle cutter, and wherein a transfer device (6) is provided for transferring the transfer strip (4.1) from the upper drying cylinder (2.3) to the lower drying cylinder (3.1), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation point (5), and the transfer device (6) comprises a guide element (7) with a vertically extending longitudinal direction (7.7), which is pivotably arranged about a pivot axis (7.3) in the region of the separation point (5) above the waste discharge device (12). The guide element (7) is pivoted from the rest position (7.5) to the transfer position (7.6) so that the transfer strip (4.1) is transferred to the drying cylinder (3.1) below, so that the transfer strip (4.1) is transferred between the net (3.6) guided around the first guide roller (3.3) of the second double-row drying unit (3) and the outer cover surface of the first drying cylinder (3.1) of the second double-row drying unit (3), and the guide element (7) comprises a main area (7.1) and an end area (7.2), wherein the end area (7.2) is connected to the main area (7.1) or is constructed as an end element separated from the main area (7.1), and the end area (7.2) comprises a cutting edge designed to cut the transfer strip (4.1).

32. The method according to claim 31, characterized in that The fibrous web (4) is a paper web, a cardboard web or a tissue web.

33. The method according to claim 31, wherein The cutting edge is a serrated cutting edge.

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