Apparatus and method for transferring a fibrous web

Abstract

The invention relates to a device for transferring a paper web, board web, tissue web or other fibrous web (9) in a machine for manufacturing and / or finishing the paper web, board web, tissue web or other fibrous web into a target area (1). There is a separating device (2) for separating the fibrous web (9) into a transfer strip (3) and a remaining web (20). The transfer strip (3) and the remaining web (20) are guided by a rotating roll (4). The separating device (2) is designed to be movable transversely to the web travel direction (7) for widening the transfer strip (3). The device according to the invention is characterized in that, between the rotating roll (4) and a subsequent machine element (5), before or during the widening of the transfer strip (3), a stabilizing element (6) is positionable in the area of the remaining web (20), wherein the stabilizing element (6) at least partially covers the remaining web (20) and the remaining web (20) is guided downward between the rotating roll (4) and the stabilizing element (6). The invention also relates to a method for transferring a fibrous web.

Description

TECHNICAL FIELD

[0001] The invention relates to a device for transferring a paper web, board web, tissue web or other fibrous web in a machine for manufacturing and / or finishing paper webs, board webs, tissue webs or other fibrous webs into a target area, which has a separating device to separate the fibrous web into a transfer strip at a first edge of the fibrous web and a remaining web, wherein the transfer strip and the remaining web are guided past a rotating roll in front of the target area by their side opposite to the top side of the fibrous web and partially wrap around the roll and are guided downward from the machine by the roll, and wherein a transfer device is provided to transfer the transfer strip to a subsequent machine element of the target area, and wherein the separating device is designed to be movable transversely to the web travel direction to widen the transfer strip.

[0002] The invention also relates to a method for transferring a paper web, board web, tissue web or other fibrous web in a machine for manufacturing and / or finishing paper webs, board webs, tissue webs or other fibrous webs. BACKGROUND

[0003] For example, in papermaking such a device is used to feed a new web head into a target roll, for example designed as a drying cylinder or a web guide roll that diverts the paper web or onto which the paper web is to be wound, when the paper machine is started up or after a web break. This transfer takes place in sections in the paper machine. Here, the cut narrow transfer strip is transferred into the subsequent paper machine section. The remaining web is guided downward from the machine into a pulper, dissolved and recycled. When the transfer strip is widened by the movement of the separating element transversely to the web travel direction, the remaining web is narrowed and becomes more unstable in its travel. This can lead to a flutter of the remaining web, which in turn enters the target area uncontrolled, whereby a break can occur. In addition, paper chips can also be deposited in the machine.

[0004] Devices are known for solving this problem. The document EP 1903142 B1 describes a system for the widened travel of a fibrous web. A stabilizing device is disclosed that acts on the bottom side of the fibrous web. The stabilizing device is for example loaded with or generates a negative pressure in order to stabilize the remaining web.

[0005] On the one hand, the known devices are complex in terms of installation and operation. A vacuum has to be generated in order to stabilize the fibrous web. On the other hand, the negative pressure leads to friction between the fibrous web and the stationary stabilizing device. This can lead to dust accumulation. SUMMARY

[0006] The technical problem addressed by the invention is therefore to simplify and improve the stabilization of the fibrous web during the transfer.

[0007] The technical problem is solved by a device for transferring a fibrous web into a target area in a machine for producing and / or refining a fibrous web. A device for transferring a paper web, a cardboard web, a tissue web or other fibrous web into a target area in a machine for producing and / or refining a paper web, a cardboard web, a tissue web or other fibrous web is proposed, the device comprising a separating device for separating the fibrous web into a transfer strip at a first edge of the fibrous web and a residual web, wherein the transfer strip and the residual web contact a rotating roller with their sides opposite the top side of the fibrous web and partially wrap around the roller and are guided downward from the machine by the roller, wherein a transferring device is provided for transferring the transfer strip to a subsequent machine element in the target area, and wherein the separating device is designed to be movable transversely to the direction of web travel in order to widen the transfer strip.

[0008] According to the invention, it is proposed that between the rotating roller and the subsequent machine element, before or during the widening of the transfer strip, a stabilizing element can be positioned in the area of ​​the residual material web opposite the top side in order to stabilize the transfer strip, wherein the stabilizing element at least partially covers the residual material web and the residual material web is guided downwards between the rotating roller and the stabilizing element.

[0009] The rotating roller can preferably be designed as a drying cylinder.

[0010] By arranging the stabilizing element opposite the top side of the fibrous web, that is, in the space between the fibrous web and the target area, the stabilizing element can be designed to be passive, meaning that no vacuum is required. Furthermore, the stabilizing element is designed to be positioned within the paper machine. This allows it to be positioned within the paper machine solely for the transfer process and then removed from the paper machine for production operation or brought to a parking position inside or outside the paper machine. In this case, the stabilizing element does not create disruptive airflow, or in other words, does not interfere with the desired airflow. This is particularly applicable when the device is used in the dryer section.

[0011] The fibrous web is separated into a transfer strip and a remaining web by a separating element. At the start of the separation process, the transfer strip is narrower than the remaining web and is located at the first edge of the fibrous web. In advantageous practical situations, the first edge of the fibrous web corresponds to the operator side of the device. After the transfer strip has been transferred to the target area using a transfer device known per se, such as a blower, the separating device is moved toward the drive side of the device. This causes the remaining web to become increasingly narrow, and the web travel becomes increasingly unstable. Stabilizing elements now simply prevent the remaining web from moving toward the target area, such as toward a subsequent roller or clothing, preferably in the area of ​​the drive-side edge of the remaining web.

[0012] The two sides of a paper machine are often referred to as the operator's side and the drive side. The operator's side is the working side for the paper machine operator. Transfer strips are formed at the operator-side edge of the fibrous web to enable control and influence of the transfer process. The paper machine's drives and auxiliary units are arranged on the drive side and are therefore only accessible to the operator to a limited extent.

[0013] In an advantageous embodiment, during the stabilization of the transfer strip, the distance between the stabilizing element and the rotating roller and / or the top side of the running residual web is less than 150 mm. This facilitates the stabilization of particularly narrow residual webs and prevents breakage.

[0014] In a practical embodiment, the stabilizing element is designed to be rotatable parallel to the axis of the rotating roller. This assists in directing the residual web downward from the paper machine into the beater.

[0015] In practically feasible cases, the direction of rotation of the stabilizing element is opposite to the direction of rotation of the rotating roller.

[0016] Preferably, the stabilizing element has a rotary drive. Preferably, the rotational speed is adjustable. This also assists in guiding the residual web downward from the paper machine into the beater.

[0017] Furthermore, the stabilizing element can be arranged at the edge of the fibrous web opposite the first edge and preferably dimensioned so that the maximum coverage of the remaining web transverse to the direction of web travel is 20 mm to 800 mm, in particular 20 mm to 500 mm, and preferably 150 mm to 250 mm. Preferably, the first edge corresponds to the operator-side edge of the fibrous web, and in this case, the edge opposite the first edge corresponds to the drive-side edge of the fibrous web. Only partially covering the initially wide remaining web in the drive-side edge region by the stabilizing element reduces structural complexity and facilitates handling of the stabilizing element. The remaining web is fully covered only when its width reaches the width of the stabilizing element during the widening travel of the transfer strip.

[0018] Depending on the parameters of the residual web, it may be sufficient for the stabilizing element to only partially cover the residual web during the stabilization of the transfer web before the transfer web widens.

[0019] However, if the stabilizing element completely covers the remaining material web during the stabilization of the transfer strip before the transfer strip widens, a comprehensive forced guidance of the remaining material web results.

[0020] Advantageously, the improved design is that during the stabilization of the transfer strip, the stabilizing element preferably presses the remaining web against the rotating roller with an adjustable force. This is particularly beneficial to the stabilizing effect when the remaining web is narrow and avoids breakage.

[0021] In a possible embodiment, the stabilizing element is mounted on the support in such a way that its position can be changed transversely to the web travel direction and / or along the web travel direction, preferably vertically. This facilitates covering the entire web width, web position and cutting position of the remaining web.

[0022] The stabilization element can be positioned for this purpose manually or automatically.

[0023] In practical applications, the fibrous web is partially guided around rotating rollers, with the fibrous web positioned between the drying wire and the rotating rollers. The drying wire presses the fibrous web against the surface of the rotating rollers. The drying wire is then guided away from the rotating rollers, forming a removal line. During production, the fibrous web and the drying wire continue to travel together. During transfer, the fibrous web and the drying wire separate. The fibrous web continues to travel on the rotating rollers until it reaches a scraper, which releases the fibrous web and allows it to flow downward into a beater. This then begins the process of transferring the fibrous web to the target area.

[0024] Advantageously, the stabilizing element is positioned directly before the following doctor blade in the direction of rotation of the rotating roller and preferably after it has been moved off the line.

[0025] A stabilization region is formed between the removal line and the stabilization element, in which the travel of the remaining web is stabilized.

[0026] The position of the stabilizing element can be expressed by its vertical distance from an imaginary horizontal plane extending through the center of the rotating roller. The stabilizing element is arranged below the horizontal plane. This applies both to stabilizing elements that are in contact with the remaining web and to stabilizing elements that are spaced apart from the remaining web. The distance from the horizontal plane to the upper edge of the stabilizing element is preferably measured.

[0027] The rotating roller has a roller radius. The vertical distance can be less than or equal to 0.9 times the roller radius, preferably less than or equal to 0.83 times the roller radius, and particularly less than or equal to 0.6 times the roller radius. This allows the size of the stable region to be optimized.

[0028] Advantageously, the vertical distance can be in a range greater than or equal to 0.4 times the roller radius, preferably in a range greater than or equal to 0.45 times the roller radius, in particular in a range greater than or equal to 0.5 times the roller radius. This also allows the size of the stabilization zone to be optimized.

[0029] The stabilizing elements can be designed as rollers or guide rollers. This allows for a very simple and cost-effective solution.

[0030] In order to protect the remaining material web, the guide roller as a stabilizing element can have an elastic roller shell.

[0031] The guide roller used as a stabilizing element can have a diameter of between 30 mm and 500 mm, preferably between 30 mm and 300 mm, in particular between 30 mm and 200 mm.

[0032] Advantageously, the guide roller serving as stabilizing element comprises a material selected from the group consisting of aluminum, V2A steel, V4A steel, cast iron, plastic, titanium, brass, bronze.

[0033] In a possible further development, the guide roller serving as the stabilizing element comprises a coating or a roller sleeve from the following group of materials: rubber, polyurethane, Teflon, carbon fiber reinforced plastic.

[0034] The roller cover can also be designed as a monofilament mesh fabric.

[0035] The guide rollers used as stabilizing elements can be multiply supported.

[0036] Alternatively, the stabilizing element can also be designed as a blowing device. With this, the fluid is blown onto the remaining material web in the covering area for stabilization.

[0037] In special cases, a simple design of the stabilizing element may also be sufficient with regard to the properties of the remaining material web. Thus, the use of foils, brushes, paddles, air cushions may be sufficient.

[0038] It is also possible to use a blowpipe arranged transversely to the direction of travel of the remaining web, which blows at least one fluid jet, for example an air jet, onto the remaining web and thereby stabilizes its travel.

[0039] In a possible improved design, a blowpipe is used which is arranged transversely to the direction of travel of the remaining web. The blowpipe blows at least one fluid jet, such as an air jet, onto the remaining web and cooperates with a guide surface extending in the direction of travel of the remaining web to stabilize the travel of the remaining web.

[0040] Furthermore, it is possible to design the stabilizing element as a belt which is guided around two or three or more rollers.

[0041] The technical problem is also solved by a method for transferring a paper web, board web, tissue web or other fibrous web in a machine for manufacturing and / or finishing a paper web, board web, tissue web or other fibrous web into a target area. A separating device is provided to separate the fibrous web into a transfer strip at a first edge of the fibrous web and a remaining web, wherein the transfer strip and the remaining web are guided downward from the machine by a roller rotating in contact with their side opposite to the top side of the fibrous web before the target area and wherein the transfer strip is transferred by a transfer device to a subsequent machine element of the target area and wherein the separating device is designed to be movable transversely to the web travel direction to widen the transfer strip. According to the present application it is proposed that between the rotating roller and the subsequent machine element, before or during the widening of the transfer strip, a stabilizing element is positioned opposite to the top side in the area of the remaining web for stabilization of the transfer strip, wherein the stabilizing element at least partially covers the remaining web and the remaining web is guided downward between the rotating roller and the stabilizing element.

[0042] The stabilizing element is preferably designed as a roller and arranged at an edge of the fibrous web opposite to the first edge.

[0043] The stabilizing element is preferably dimensioned such that the coverage of the remaining web transversely to the web travel direction amounts to 20 mm to 800 mm, in particular 20 mm to 500 mm, preferably 150 mm to 250 mm.

[0044] The present application also relates to the use of the aforementioned device for transferring a fibrous web in a machine for manufacturing and / or finishing a fibrous web into a target area. According to the present application the target area is a first or second drying cylinder of a first drying group of a drying section or a pre-drying section or a post-drying section.

[0045] The present application also relates to the use of the aforementioned device for transferring a fibrous web in a machine for manufacturing and / or finishing a fibrous web into a target area. According to the present application the target area is a size press. BRIEF DESCRIPTION OF DRAWINGS

[0046] Further features and advantages of the present application will become apparent from the following description of preferred embodiments with reference to the drawings.

[0047] In the drawings

[0048] Figure 1 schematic side view showing the transition between the press section and the drying section along with the device according to the present application;

[0049] Figure 2 simplified view showing the rotating roller as seen in the manufacturing direction;

[0050] Figure 3a schematic side view showing the transition between the press section and the drying section along with the device according to the present application; Figure 1 together with alternative stabilizing elements,

[0051] Figure 3b Show Figure 1 together with further alternative stabilizing elements. DETAILED DESCRIPTION

[0052] according to Figure 1 During normal operation, the fibrous web 9 is transferred from a forming wire 10 of a former for forming a sheet to a subsequent press section, where a water-absorbing dewatering belt 11 continuously circulates over the fibrous web 9 for dewatering the fibrous web 9. The press section, as shown here, comprises one or generally a plurality of press nips, through which the fibrous web 9 is guided together with at least one dewatering belt 11, 12, respectively.

[0053] exist Figure 1 In the embodiment of the present invention, the fibrous web 9 is passed through a single press nip formed by two press rollers 13 and 14 together with an upper dewatering belt 11 and a lower dewatering belt 12. After the press nip, the upper dewatering belt 11 guides the fibrous web 9 away from the fibrous web 9, and the fibrous web 9 is transferred from the lower dewatering belt 12 to an air-permeable, continuously circulating drying wire 15 of a subsequent drying unit for drying the fibrous web 9. The transfer of the fibrous web 9 is supported by a guide roller 20, which is covered by the drying wire 15 and sucked during the transfer.

[0054] In the drying unit, the fibrous web 9 is alternately guided from a drying wire 15 to heated drying cylinders 16 and suction guide rollers 17. The drying wire 15 presses the fibrous web 9 against the heated outer surface of the drying cylinders 16. All drying cylinders 16 are positioned below the fibrous web 9, while the guide rollers 17 are positioned above it. This allows the fibrous web 9 to be easily guided to the machine stack during breakage or transfer, where it can be collected in a beater 18. For this purpose, the first drying cylinder 16 is equipped with a scraper 8, which removes the fibrous web 9, its residues, or other impurities from its outer surface. The row of drying cylinders 16 is positioned above the row of guide rollers 17. To ensure that the fibrous web 9 is guided on the drying wire 15 and between the drying cylinders 16, suction boxes 19 are located between two adjacent drying cylinders 16 within the drying wire loop. During normal operation, the negative pressure from the suction boxes 19 draws the fibrous web 9 onto the drying wire 15. The suction guide rollers 17 , 20 have perforated roller shells, the interior of which is connected to a vacuum source.

[0055] During machine startup or during a break, the separating device 2 separates the transfer strip 3 from the fibrous web 9. The transfer strip 3 must then be transferred to the target area 1 downstream of the machine. For example, the separating device 2 is arranged in the former, where the transfer strip 3 is separated at the edge of the fibrous web 9 on the operator's side 22 of the machine. The remaining web 20 of the fibrous web 9 is guided from the forming wire 10 to the machine stack. The separating device 9 comprises one or two water jet nozzles, which direct their water jets onto the fibrous web 9 supported on the forming wire 10 and separate the web tips from the fibrous web 9. The separating device 2 can also be arranged at other locations in the papermaking machine, where the fibrous web 9 can be cut in either a wire-supported area or an unsupported area, such as during free draw. Lasers or mechanical separating devices, such as rotating, preferably toothed circular knives, fixed knives, or needles, can also be provided instead of the liquid-discharging nozzles. However, mechanical separating devices are typically only used when the fibrous web 9 is traveling unsupported.

[0056] The transfer strip 3 is guided by the dewatering belts 11 and 12 through the press section and onto the drying wire 15 of the subsequent drying unit. Starting from the drying wire 15, the transfer strip 3 comes into contact with a rotating roller 4, in the form of the first drying cylinder 16 of the drying unit. After partially wrapping around the first drying cylinder 16, the transfer strip 3 is guided downward into the machine stack, specifically into the beater 18 located there. The transfer strip 3 then gradually widens until the full width of the fibrous web 9 reaches the rotating roller 41 and is also directed to the beater 18. The underside of the fibrous web 9, opposite the top side 9.1, comes into direct contact with the internally heated rotating roller 4, which is designed as a drying cylinder. The drying wire 15 is pressed against the top side 9.1 of the fibrous web 9. As the fibrous web 9 descends into the beater 18, the drying wire 15 is guided away from the surface 9.1 at the removal line 15.1 and onto the next guide roller 17. The separating device then returns to its starting position. With a suitable design of the wet end of the paper machine, this first transfer step can also be achieved by transferring the fibrous web 9 with its full width, without cutting the transfer strip.

[0057] The present invention can be advantageously used in the following transfer steps. To transfer the fibrous web 9 to the target area 1, a new transfer strip 3 and a residual web 20 are formed from the fibrous web 9 wrapped around a rotating roller by a separating device 2. As is known per se, the transfer strip 3 is transferred from the wrapped roller 4 by a blower (not shown) to a subsequent machine element 5 in the form of a drying wire 15 of the first drying unit, which is guided from the roller 4. Alternatively, the subsequent machine element 5 can also be formed by a rotating roller. After the new transfer strip 3 has been completely transferred to the new target area 1, widening is also achieved. However, it is crucial that the residual web 20 reliably flows from the rotating roller 4 down to the machine stack, in particular the beater 18. In particular, there is a risk that the residual web 20 will travel uncontrolled with the subsequent machine element 5 during the widening of the transfer strip 3, resulting in edge defects or breaks. Therefore, in order to stabilize the run of the residual web 20, before or during the widening run of the transfer strip 3, a stabilizing element 6 facing the top side 9.1 of the fiber material 9 is positioned on the drive side 21 in the space between the rotating roller 4 and the subsequent machine element 5. The stabilizing element 6 is arranged in the vertical direction between the removal line 15.1 of the drying wire 15 and the scraper 8. The vertical distance 24 of the stabilizing element 6 from the horizontal plane 23 is in this case in a range of less than or equal to 0.9 times the roller radius Rw below the horizontal plane 23. The vertical distance 24 can also be in a range of less than or equal to 0.83 times the roller radius or in a range of less than or equal to 0.6 times the roller radius. In this way, the size of the stabilizing area can be optimized. For certain applications, it is suitable that the vertical distance 24 is in a range of greater than or equal to 0.4 times the roller radius, preferably in a range of greater than or equal to 0.45 times the roller radius, in particular in a range of greater than or equal to 0.5 times the roller radius. In Figure 1 and Figure 2 In the example shown, the stabilizing element 6 is formed by a guide roller 6 which is parallel to the axis of the rotating roller 4. Figure 2 The guide roller 6 is positioned in such a way that it only partially covers the remaining web 20 before the widening process and the edge of the remaining web 20 on the drive side is reliably guided downwards between the rotating roller 4 and the guide roller 6 into the beater 18. The positioning of the guide roller 6 can be achieved by pivoting or by translation parallel to or perpendicular to the roller axis. In this way, the fibrous web 9 is guided through the machine in stages. Therefore, the transfer device according to the invention can also be implemented at different locations on the machine. Figure 1In the illustrated design, the guide roller 6 is positioned directly in front of the scraper 8 following the rotating roller 4 in the direction of rotation. This ensures that the residual web 20 enters the beater 18 between the guide roller 6 and the scraper 8. Furthermore, the guide roller 6 slightly presses the residual web 20 against the rotating roller 4, i.e., the drying cylinder 16. Therefore, in high-speed machines, the guide roller 6 can have its own rotational drive. The position of the guide roller 6 can advantageously be varied transversely to the web travel direction 7, thereby controlling the overall web width, coverage, and cutting position of the separating device 2. The guide roller 6 has a diameter between 30 and 300 mm and a width between 20 and 500 mm. Furthermore, the guide roller 6 has an elastic sleeve made of rubber, polyurethane, fabric, or similar material to protect the outer circumference of the rotating roller 4.

[0058] Figure 2 A simplified view of the device shows the rotating roller 4, viewed facing the production direction, during the widening of the transfer strip 3. For reasons of clarity, the drying wire 15 is not shown. The transfer strip 3 has already been transferred to the subsequent machine element 5. The transfer strip 3 and the residual web 20 are separated by a cutting line 2.1, which is generated by the separating device 2. The transferred transfer strip 3 leaves the surface of the drying cylinder 16 at the removal line 15.1 together with the drying wire 15. A stabilizing element 6, designed as a guide roller, is arranged in the drive-side region of the residual web 20.

[0059] Figure 3a Show Figure 1 together with the alternative stabilizing element 6. Figure 1 and Figure 2 The difference is that, instead of a guide roller as the stabilizing element 6, a blowpipe is used, which is arranged transversely to the direction of travel of the residual web. The blowpipe blows at least one fluid jet, such as an air jet, onto the residual web 20, thereby stabilizing its travel. In this example, the vertical distance 24 of the stabilizing element 6 from the horizontal plane 23 is within a range of less than or equal to 0.9 times the roller radius Rw. The vertical distance 24 can also be within a range of less than or equal to 0.83 times the roller radius or less than or equal to 0.6 times the roller radius. This allows the size of the stabilizing region to be optimized. For certain applications, it is expedient for the vertical distance 24 to be within a range of greater than or equal to 0.4 times the roller radius, preferably greater than or equal to 0.45 times the roller radius, and in particular greater than or equal to 0.5 times the roller radius.

[0060] Figure 3bA possible improved design shows the use of a blowpipe arranged transversely to the web travel direction 7 of the residual web 20. The blowpipe blows at least one fluid jet, such as an air jet, onto the residual web and cooperates with guide surfaces, such as guide plates, extending in the web travel direction 7 of the residual web 20 to stabilize the movement of the residual web 20. Therefore, the stabilizing element 6 comprises a blowpipe with a guide surface. The fluid jet can also be directed along the guide plates, thereby entraining the residual web 20 by the fluid jet and stabilizing it along the guide plates. In this example, the vertical distance 24 of the stabilizing element 6 from the horizontal plane 23 is within a range of less than or equal to 0.9 times the roller radius Rw. Alternatively, the vertical distance 24 can be within a range of less than or equal to 0.83 times the roller radius or less than or equal to 0.6 times the roller radius. This allows the size of the stabilizing region to be optimized. For certain applications, it is expedient for the vertical distance 24 to be in a range greater than or equal to 0.4 times the roller radius, preferably greater than or equal to 0.45 times the roller radius, in particular greater than or equal to 0.5 times the roller radius.

[0061] Corresponding elements of the exemplary embodiments are provided with the same reference numerals in the drawings. The functions of these elements correspond to one another in the individual drawings unless otherwise indicated and unless conflicts arise. Therefore, a detailed description thereof will not be given. The present invention is not limited to the illustrated combinations of features of the illustrated exemplary embodiments.

[0062] List of Figure Symbols

[0063] 1 Target area

[0064] 2 Separation device

[0065] 2.1 Cutting Line

[0066] 3 Transfer Bar

[0067] 4 rotating rollers

[0068] 5 Subsequent machine components

[0069] 6 Stabilizing elements

[0070] 7 Web travel direction

[0071] 8. Scraper

[0072] 9 Fiber web

[0073] 9.1 Top side of the fibrous web

[0074] 10 Forming fabric

[0075] 11 Dehydration belt

[0076] 12 Dehydration belt

[0077] 13 Upper press roller

[0078] 14 Lower press roll

[0079] 15 Drying net

[0080] 15.1 Moving Offline

[0081] 16 Drying Cylinder

[0082] 17 Guide Roller

[0083] 18 Beater

[0084] 19 Suction box

[0085] 20 remaining material width

[0086] 21 Drive side

[0087] 22 Operator side

[0088] 23 Horizontal plane

[0089] 24 vertical distance

[0090] Rw roller radius of the rotating roller

Claims

1. A device for transferring a fibrous web into a target area (1) in a machine for producing and / or refining a fibrous web (9), comprising a separating device (2) for separating the fibrous web (9) into a transfer strip (3) located at a first edge of the fibrous web (9) and a residual web (20), wherein: The transfer strip (3) and the residual web (20) contact a rotating roller (4) with their side opposite the top side (9.1) of the fibrous web (9) before the target area (1) and partially cover the roller and are guided downward from the machine by the roller, and a transfer device is provided to transfer the transfer strip (3) to a subsequent machine element (5) of the target area (1), and the separating device (2) is designed to be movable transversely to the web travel direction (7) to widen the transfer strip (3), It is characterized by: Between the rotating roller (4) and the subsequent machine element (5), before or during the widening of the transfer strip (3), a stabilizing element (6) can be positioned opposite the top side in the area of ​​the residual material web (20) for stabilizing the transfer strip, wherein the stabilizing element (6) at least partially covers the residual material web (20) and the residual material web (20) is guided downwards between the rotating roller (4) and the stabilizing element (6).

2. The device according to claim 1, characterized in that During stabilization of the transfer strip, the distance between the stabilization element (6) and the rotating roller (4) and / or the top side (9.1) of the running residual web (20) is less than 150 mm.

3. The device according to claim 1 or 2, characterized in that The stabilizing element (6) is designed to be rotatable parallel to the axis of the rotating roller (4).

4. The device according to claim 3, characterized in that The stabilizing element (6) has a rotational drive.

5. The device according to claim 1 or 2, characterized in that The stabilizing element (6) is arranged at the edge of the fibrous web (9) opposite the first edge and is dimensioned such that the maximum coverage of the remaining web (20) transversely to the web running direction (7) is 20 mm to 800 mm.

6. The device according to claim 1 or 2, characterized in that During the stabilization of the transfer strip, the stabilizing element (6) presses the residual web (20) against the rotating roller (4) with an adjustable force.

7. The device according to claim 1 or 2, characterized in that The stabilizing element (6) is supported on a support, and its position can be changed transversely to the web running direction (7) and / or along the web running direction (7).

8. The device according to claim 1 or 2, characterized in that The stabilizing element (6) is positioned directly before the scraper (8) following in the direction of rotation of the rotating roller (4).

9. The device according to claim 1, characterized in that The stabilizing element (6) is designed as a guide roller.

10. The device according to claim 9, characterized in that The guide roller has an elastic roller shell.

11. The device according to claim 9 or 10, characterized in that The guide rollers have a diameter between 30 mm and 500 mm.

12. The device according to claim 5, characterized in that The stabilizing element (6) is dimensioned such that the maximum coverage of the remaining web (20) transversely to the web running direction (7) is 20 mm to 500 mm.

13. The device according to claim 5, characterized in that The stabilizing element (6) is dimensioned such that the maximum coverage of the remaining web (20) transversely to the web running direction (7) is 150 mm to 250 mm.

14. The device according to claim 1 or 2, characterized in that The distance (24) between the stabilizing element (6) and a horizontal plane (23) extending through the center of the rotating rollers (4, 9) is less than or equal to 0.9 times the roller radius (Rw).

15. The device according to claim 14, characterized in that The distance (24) between the stabilizing element (6) and a horizontal plane (23) extending through the center of the rotating rollers (4, 9) is less than or equal to 0.83 times the roller radius (Rw).

16. The device according to claim 14, characterized in that The distance (24) between the stabilizing element (6) and a horizontal plane (23) extending through the center of the rotating rollers (4, 9) is less than or equal to 0.6 times the roller radius (Rw).

17. The device according to claim 1 or 2, characterized in that The distance (24) between the stabilizing element (6) and a horizontal plane (23) extending through the center of the rotating rollers (4, 9) is greater than or equal to 0.4 times the roller radius (Rw).

18. The device according to claim 17, characterized in that The distance (24) between the stabilizing element (6) and a horizontal plane (23) extending through the center of the rotating rollers (4, 9) is greater than or equal to 0.45 times the roller radius (Rw).

19. The device according to claim 17, characterized in that The distance (24) between the stabilizing element (6) and a horizontal plane (23) extending through the center of the rotating rollers (4, 9) is greater than or equal to 0.5 times the roller radius (Rw).

20. The device according to claim 11, characterized in that The guide roller has a diameter between 30 mm and 300 mm.

21. The device according to claim 11, characterized in that The guide roller has a diameter between 30 mm and 200 mm.

22. The device according to claim 1, characterized in that The fibrous web (9) is a paper web, a cardboard web or a tissue web.

23. A method for transferring a fibrous web into a target area (1) in a machine for producing and / or refining a fibrous web (9), comprising a separating device (2) for separating the fibrous web (9) into a transfer strip (3) at a first edge of the fibrous web (9) and a residual web (20), wherein: The transfer strip (3) and the residual web (20) contact a rotating roller (4) with their sides opposite the top side (9.1) of the fibrous web (9) before the target area (1) and partially wrap around the roller and are guided downwardly from the machine by the roller, and wherein the transfer strip (3) is transferred by a transfer device to a subsequent machine element (5) of the target area (1), and wherein the separating device (2) is designed to be movable transversely to the web travel direction (7) in order to widen the transfer strip (3), It is characterized by: Between the rotating roller (4) and the subsequent machine element (5), before or during the widening of the transfer strip (3), a stabilizing element (6) is positioned in the area of ​​the residual material web (20) opposite the top side for stabilizing the transfer strip, wherein the stabilizing element (6) at least partially covers the residual material web (20) and the residual material web (20) is guided downwards between the rotating roller (4) and the stabilizing element (6).

24. The method according to claim 23, characterized in that The stabilizing element (6) is designed as a guide roller and is arranged at the edge of the fibrous web (9) opposite the first edge and is dimensioned so that the remaining web (20) covers a distance of 20 mm to 800 mm transversely to the web running direction (7).

25. The method according to claim 24, characterized in that The stabilizing element (6) is dimensioned such that the remaining web (20) covers a distance of 20 mm to 500 mm transversely to the web running direction (7).

26. The method according to claim 24, characterized in that The stabilizing element (6) is dimensioned such that the remaining web (20) covers a distance of 150 mm to 250 mm transversely to the web running direction (7).

27. Use of a device according to one of claims 1 to 22 for transferring a fibrous web (9) into a target area (1) in a machine for producing and / or refining a fibrous web, characterized in that The target area (1) is the first or second drying cylinder of the first drying unit of the drying section, pre-drying section or post-drying section.

28. Use of a device according to one of claims 1 to 22 for transferring a fibrous web (9) into a target area (1) in a machine for producing and / or refining a fibrous web, characterized in that The target area (1) is a film press.

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