EP3914547A1

EP3914547A1 - Web transfer during winding

Info

Publication number: EP3914547A1
Application number: EP19813751.5A
Authority: EP
Inventors: Gerhard Leisser; Ewald Wetschenbacher; Malte Müller; Matthias Wohlfahrt
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2019-01-24
Filing date: 2019-11-28
Publication date: 2021-12-01
Also published as: DE102019101725A1; CN113329962B; CN113329962A; WO2020151854A1

Abstract

The invention relates to a method and to winding machines for transferring a material web (1), in particular a paper or board web, which is running over a winding roll (6) and being wound onto a wound reel (4) forming a first winding nip (8) with the winding roll (6), onto a new winding core (3) forming a second winding nip (8) with the winding roll (6), wherein, upstream of the second winding nip (8), a new web start is formed in the wrapping region of the winding roll (6) by means of a separating device (9) and the new web start is wound onto the new winding core (3). In this case, the transfer is intended to be designed to be safer, with means that are as simple as possible, in that at least one web parameter of the web start is altered in a winding-supporting manner before it is wound.

Description

Web overpass when winding

The invention relates to a method for transferring a web of material running over a winding roller, in particular a paper or cardboard web, which is wound onto a winding roll forming a first winding nip with the winding roller, onto a new winding core forming a second winding nip with the winding roller, whereby before the second winding gap in the wrapping area of the winding roller a new beginning of the web is formed by means of a separating device and the new beginning of the web is wound onto the new winding core.

The invention also relates to winding machines for transferring a web of material running over a winding roller, in particular a paper or cardboard web, which is wound onto a winding roller forming a first nip with the winding roller, onto a new winding core forming a second winding nip with the winding roller, whereby before the In the second winding gap in the wrapping area of the winding roller, a separating device for forming a new start of the web is arranged and the new start of the web is wound onto the new winding core, in particular for carrying out the method. A method proposed, for example, in DE 101 61 073 A1 is used to transfer a material web, for example in the area of a reeling device of a paper or board machine, a coating machine or an equivalent machine, in order to transfer the material web without interrupting the production process, i. H. Without switching off the paper or cardboard machine, one after the other onto empty winding cores, which are also referred to as empty reels, or around the material web in one special situation, for example after the paper or cardboard web has been torn off or after the paper or cardboard machine has started up wind up empty winding core.

It must be ensured here that the beginning of the web created by separating the material web is fed to the new winding core in order to form a new winding roll thereon. By inserting the at least one initial separating piece between the at least one transfer strip and the winding roller, which is connected to the new winding core after reaching the nip in the area not covered by the transfer strip, and the defined separation of the transfer strip by the initial separating piece to form a new one , a clean start of the winding is guaranteed to the initial separator and the new winding core bound to the web

From EP 0 765 832 B1 a method for winding up a paper or cardboard web is known, in which the web is supported during the winding up by means of a belt which runs through a gap between the winding core or the supporting roller and the winding roller and which runs through a additional roller is supported. When the paper or cardboard roll that is wound on the winding roll is terminated, it is pressed to a change position by means of the additional roller, and a new winding core is inserted into the space between the roller and the

Winding roller lowered. A changing device is lowered to the new winding core. The end piece of the web is separated from the center towards the edges by means of water separating nozzles. The beginning of the web resulting from the cutting process is blown towards the winding core by means of air. At the same time, the end piece of the web, which is still being wound onto the full winding roll, is glued to the upper layer of the web roll on the winding roll by means of an adhesive. The adhesive is sprayed onto the web from nozzles at a fixed distance from the dividing line. The separation process takes place in an embodiment of the known device

Water separating nozzles that are arranged so that the ones they produce

Cut water dividing lines. The adhesive nozzles for applying the adhesive are also arranged in a corresponding manner. From WO 92/06913 a method for separating a material web by means of water jet nozzles is known, which generate a weakly V-shaped dividing line. From DE 42 08 746 C2 a method for changing bobbins in a winding machine for winding a web is known, in which the web is cut by means of cutting devices in the middle part along two lines in the running direction of the web, the interfaces above the reeling drum, ie the winding roller, in The web running direction is in front of the reeling drum and then a triangular cut is made by moving the cutting devices in the direction of the respective web edges to separate the entire strip, the narrow median strip of the web being cut in the web running direction behind the contact point between the winding core and the winding roller. Here, an adhesive label with adhesive surfaces on both sides is fed to a contact point on the winding core, which lies between the two lines, in order to form a guide tape, the guide tape being brought exactly onto the new spool by the label, attached and the front end of the guide tape being fastened by the Label is lifted from the winding roller to form a space so that it can be easily separated in the direction of travel in front of the label by a high-pressure air jet blown into this space.

Overall, this is relatively complex and sometimes prone to failure.

The object of the invention is therefore to ensure the safe transfer of the material web with the simplest possible means.

According to the invention, the object was achieved in that at least one web parameter of the web catch is changed in a manner that supports the winding prior to winding.

The bending stiffness of the material web can be a problematic web parameter when transferring. If the bending stiffness is too great, the start of the web cannot follow the curvature of the new winding core. In this case, the bending stiffness of the beginning of the web should be reduced, in particular by moistening the same at least on one side. This can be done before and / or after the web start has been cut out. Another critical web parameter during transfer can be the smoothness on the side of the web start facing the winding roller. Since, as a rule, the winding roller also has a smooth outer surface, the adhesion can be between

The beginning of the web and the winding roller must be large enough that the beginning of the web follows the winding roller and is therefore not wound on the new winding core.

To reduce the smoothness, the side of the start of the web facing the winding roller in front of the winding roller should therefore be brought into contact with or pressed against a profiled surface. With regard to the winding machine, it is therefore essential that at least the section of the material web forming the new web start is moistened with a moistener before or after the separating device and / or at least the section forming the new web start of the web side of the material web facing the winding roller in front of the winding roller with a Profiling element comes into contact with a profiled contact surface.

For example, the web start can be roughened by guiding the corresponding web side over a non-rotating profiling element with a rough surface. The effect is similar to that of emery paper.

Alternatively, at least the section of the material web forming the beginning of the web can also wrap around a profiling element in the form of a rotating roller with a profiled lateral surface. The web tension may already be sufficient for embossing the profile into the contact side of the material web.

If, in the interest of an even greater reduction in the web smoothness, a greater pressing of the material web against the profiling element is required, a counter element pressing the material web to the profiling element can be arranged on the web side opposite the profiling element. A counter-rotating belt, a rotating roller or a compressed air blower are particularly suitable as counter elements. If necessary, the profiling element can extend over the entire web width.

If, however, the new start of the web is formed by a web strip, it is sufficient if the profiling element only extends over the width of the web strip.

Regardless of the design of the profiling element, this should preferably be arranged in front of the winding roller in free pull.

In order to improve or even ensure the flow of the start of the web on the new winding core, the new winding core should be provided with an adhesive device with respect to the beginning of the web and / or the beginning of the web on the side facing the new winding core with an adhesive device with an adhesive device.

With regard to the winding machine, this means that the new winding core in the area of the new web start and / or the web start on the side facing the new winding core is assigned an adhesive device which applies an adhesive to the new winding core or the web start.

Particularly suitable as an adhesive is a double-sided adhesive tape or a water-soluble adhesive, in particular an adhesive containing glue or starch.

The new beginning of the web should preferably be designed as a web strip, the material web then being separated as the web strip becomes wider.

Depending on the application and design of the winding machine, the web tip of the material web strip is arranged on the drive side or on the driver side or in the middle of the material web. In a preferred embodiment, it will be arranged on the side on which the transfer strip arranged upstream in the winding machine is already arranged. This is usually on the driver's side.

Alternatively, however, it can also be advantageous if the material web is separated by a single continuous dividing line. With regard to a process-reliable generation of the beginning of the web, the material web is separated by means of one or more beams directed at the peripheral region of the winding roller with a high energy density, in particular water, air or laser beams.

The already wound winding core can advantageously be moved away from the winding roller before the material web is transferred to the new winding core to form a free pull of the material web, and can be braked to a standstill there after the web-wide transfer of the material web to the new winding core. This means that the first winding nip is dissolved with the winding roll and replaced by a second winding nip between the winding roller and the new winding core.

On the one hand, this creates a certain freedom for the intended changing of the winding reel, on the other hand, such a movement away and braking favors a safe operation of the winding machine.

Alternatively, in the interest of a safe web guide, it can also be advantageous if the already wound winding core remains in contact with the winding roller until the material web is transferred to the new winding roller and the second winding gap between the winding roller and the new winding core before or during the transfer in the direction of web travel the first winding gap is formed.

The invention is to be explained in more detail below on the basis of several exemplary embodiments. The features mentioned can not only be advantageously implemented in the combination shown, but can also be combined individually with one another.

In the accompanying drawing, Figures 1 to 3 show different winding arrangements in a schematic side view.

The winding machines described below are generally suitable for winding a running material web 1. The winding machine can at the end of one Machine for the production or finishing of a running material web 1 can be arranged to wind the finished and running material web 1 into a winding roll 4. The winding machine can also be used for rewinding finished winding rolls 4. By way of example only, it is assumed that this is a winding machine for winding a continuous fibrous web, in particular a paper or cardboard web.

In the winding machine, the running material web 1 is successively wound onto a plurality of winding cores 2, 3, in particular reels, to form winding rolls 4. The material web 1 to be wound is guided over a peripheral region of a stationary or preferably movably mounted winding roller 6, in particular a carrying drum. The winding roller 6 forms a first winding nip 8 with the winding roller 4 to be formed. When the winding roller 4 is full or there is a change in the quality of the material web 1, the material web 1 is cut in front of the first winding nip 8 in the looping area of the winding roller 6 by means of a separating device 9, and this emerging new web start with formation of a second winding gap 8 wound on a new winding core 3.

The separating device 9 comprises one or more jets with a high energy density, in particular one or more water jets, which are directed onto the material web 1 in the wrapping area of the winding roller 6.

The cutting on the winding roller 6 is very safe and connected with a stable web guide.

The separation of the material web 1 begins with the formation of a web tip and then continues with the movement of the water jet transversely to the web running direction 11, with the formation of a web strip which becomes web-wide.

The web strip can be separated at an edge of the material web 1 or within the material web 1, in particular in the middle thereof. If the web strip is at the edge, the water jet of the separating device 9 is moved to the opposite edge of the material web 1 in order to separate the material web 1.

To separate a web strip within the material web 1, two water jets should be used to form the web tip, which are arranged on different traversing slides and can thus be moved independently of one another. While the dividing lines of these two water jets intersect to form a V-shaped tip, the water jets are then moved to a different edge of the material web 1 to widen the web strip and ultimately cut through the material web 1.

The remainder of the material web 1 remaining when the web strip is cut out is guided into a pulper 7 by the winding roller 6 after the winding nip 8. In order to support the detachment of the material web 1 or its remnants from the winding roller 6, a scraper 5 is assigned to it.

In the winding arrangements shown in Figures 1 and 2, the winding roll 4, i.e. the already wound winding core 2 until the material web 1 is transferred to the new winding core 3 via the first winding gap 8 in contact with the winding roller 6.

According to FIG. 1, the new winding core 3 can already be pressed against the winding roller 6 before the transfer process or, as shown in FIG. 2, when the new web start is separated out, forming the new, second winding gap 8.

In both cases, the separating device 9 is located in the web running direction 11 in front of the second winding nip 8 with the new winding core 3.

In FIG. 3, the winding roll 4 to be formed is moved away from the winding roller 6 before the transfer process when the first winding gap 8 is dissolved and when a free train 12 is formed in the material web 1.

At the same time or at different times, a new winding core 3 is brought to the winding roller 6 when the new, second winding gap 8 is formed. In order to ensure reliable web guidance even when the winding nip 8 is open, the web tension should be increased after the wound winding core 2 has been led away via one or more guide and / or slitter rollers 15 arranged in front of the winding roller 6.

In general, the new winding core 3 is removed by means of a pair of levers from a drum magazine, not shown, but known to the person skilled in the art, and brought into a waiting position. In this waiting position, the new winding core 3 is preferably pre-accelerated to the circumferential speed of the winding roller 6 by means of at least one center drive (not shown) and then placed on the winding roller 6.

The fixation of the beginning of the web on the new winding core 3 is supported by an adhesive device 10, which can be performed separately or on the crossbar of the separating device 9.

Thus, as can be seen in FIG. 2, an adhesive device 10 can be assigned to the new winding core 3 in the area of the new web start, which applies an adhesive to this winding core 3.

Usually, however, as can be seen in all the figures, an adhesive device 10 is assigned to the start of the web on the side facing the new winding core 3, which applies an adhesive to the start of the web.

A double-sided adhesive tape is particularly suitable as an adhesive.

Usually, however, a water-soluble adhesive, in particular an adhesive containing glue or starch, is used as the adhesive.

Preference is given to a non-curing adhesive that allows the adhesive connection to be loosened and re-attached several times. As a result, the winding core 3 is not contaminated on its outer surface. The adhesive consists for example of a liquid or an elastic material. It is essential to the invention in general that at least one web parameter of the web catch is changed in a manner that supports the winding prior to winding. It is sufficient for the transfer process if this influence only extends over a period of 0.1 to 10, preferably 0.5 to 2 s.

If, for example, the bending stiffness of the material web 1, here the beginning of the web, is too great, the beginning of the web does not follow the curvature of the new winding core 3. In this case, the bending stiffness of the section of the material web 1 forming the new beginning of the web is reduced during the transfer

3, at least that section of the material web 1 which forms the new start of the web in front of the winding roller 6, for example on the side facing the winding roller 6, is subjected to steam via a humidifier 13 and thus moistened.

Another critical path parameter of the start of the path is the smoothness on the side facing the winding roller 6. Since the winding roller 6 often also has a smooth outer surface, the adhesion is sometimes so great that the new path start of the winding roller 6 follows beyond the winding gap 8.

In order to counteract this, in FIGS. 1 and 2 at least that side of the section of the material web 1 which faces the winding roller 6 and which forms the new beginning of the web is brought into contact or against a profiled element 14 with a profiled surface in order to reduce the smoothness in front of the winding roller 6 pressed this.

In Figure 2, the profiling element 14 is non-rotating and is formed with a rough surface. Shortly before the new web start is formed, this profiling element 14 with its rough contact surface is moved into the run of the material web 1. When the rough contact surface comes into contact with the material web 1, as a result of the emery effect, the corresponding web section is roughened here, the underside of the material web 1.

In Figure 1, the profiling element 14 is designed as a rotating roller with a profiled lateral surface. In order to further reinforce the embossing on the web side coming into contact with the profile element 14, on the web side opposite the profile element 14, here the top side of the web, there is a counter element 16 in which presses the material web 1 to the profile element 14 Formed a rotating roller.

In principle, the profiling element 14 can extend over the entire web width and thus also over a web strip. To limit the effort, however, it is advantageous if the new start of the web is formed by a web strip and the profiling element 14 extends only over the width of the web strip.

It is advantageous if the roller-shaped profiling element 14 has a diameter between 50 and 800 mm, in particular between 200 and 300 mm and a width between 10 and 50 mm.

The rotational speed of the profiling element 14 can deviate from the web speed by up to +/- 10%.

Claims

1. A method for transferring a material web (1) running over a winding roller (6), in particular a paper or cardboard web, onto one with the winding roller

(6) a first winding nip (8) forming winding roll (4) is wound onto a new winding core (3) forming a second winding nip (8) with the winding roller (6), in front of the second winding nip (8) in the looping area of the winding roller (6) a new web start is formed by means of a separating device (9) and the new web start is wound onto the new winding core (3), characterized in that at least one web parameter of the web catch is changed in a manner that supports the winding prior to winding.

2. The method according to claim 1, characterized in that

that the new start of the web is designed as a web strip and that the material web (1) is separated as the web strip becomes wider.

3. The method according to claim 1 or 2, characterized in

that the material web (1) is separated by a single continuous dividing line

4. The method according to any one of the preceding claims, characterized in that the formation of the beginning of the web and the separation of the material web (1) by means of one or more on the peripheral region of the winding roller (6) directed air or water jets.

5. The method according to any one of the preceding claims, characterized in that the already wound winding core (2) before transferring the material web (1) to the new winding core (3) with the formation of a free train (12) of the material web (1) from the Winding roller (6) is moved away.

6. The method according to any one of claims 1 to 4, characterized in that the already wound winding core (2) remains in contact with the winding roller (6) until the material web (1) is transferred to the new winding roll (3).

7. The method according to any one of the preceding claims, characterized in that the new winding core (3) is provided with an adhesive relative to the beginning of the web by an adhesive device (10).

8. The method according to any one of the preceding claims, characterized in that the beginning of the web is provided with an adhesive on the side facing the new winding core (3) by an adhesive device (10).

9. The method according to claim 7 or 8, characterized in

that the adhesive is an adhesive tape.

10.The method according to claim 7 or 8, characterized in

that the adhesive is a water-soluble adhesive, in particular an adhesive containing glue or starch.

11. The method according to any one of the preceding claims, characterized

characterized that the changed path parameter of the path start is the bending stiffness.

12.The method according to claim 11, characterized in that

that the beginning of the web is moistened at least on one side to reduce the bending stiffness.

13.The method according to any one of the preceding claims, characterized

characterized in that the changed web parameter of the web start is the smoothness on the side facing the winding roller (6).

.A method according to claim 13, characterized in that

that the side of the start of the web facing the winding roller (6) is brought into contact with a profiled surface or pressed against it to reduce the smoothness in front of the winding roller (6). .Wrapping machine for transferring a material web (1) running over a winding roller (6), in particular a paper or cardboard web, which is wound onto a winding roller (4) forming a first winding nip (8) with the winding roller (6) onto a the winding roller (6) forms a new winding core (3) forming a second winding gap (8), a separating device (9) for forming a new web start and the new web start being arranged in front of the second winding gap (8) in the wrapping region of the winding roller (6) the new winding core (3) is wound up, in particular for carrying out the method according to one of the preceding claims, characterized in that at least the section of the material web (1) forming the new web start before or after the separating device (9) via a humidifier (13) is moistened. .Wrapping machine for transferring a material web (1) running over a winding roller (6), in particular a paper or cardboard web, which is wound onto a winding roller (4) forming a first winding nip (8) with the winding roller (6) onto a the winding roller (6) forms a new winding core (3) forming a second winding gap (8), a separating device (9) for forming a new web start and the new web start being arranged in front of the second winding gap (8) in the wrapping region of the winding roller (6) the new winding core (3) is wound up, in particular for carrying out the method according to one of claims 1 to 14 or in particular according to claim 15, characterized in that

at least that portion of the web side of the material web (1) which faces the winding roller (6) and which forms the new beginning of the web comes into contact with a profiling element (14) with a profiled contact surface in front of the winding roller. .Wrapping machine according to claim 16, characterized in that the profiling Element (14) non-rotated and preferably has a rough surface. .Wrapping machine according to claim 16, characterized in that

the profile element (14) is designed as a rotating roller with a profiled lateral surface. .Wrapping machine according to one of claims 16 to 18, characterized in that a counter element (16) pressing the material web (1) to the profiling element (14) is arranged on the web side opposite the profiling element (14). .Wrapping machine according to claim 19, characterized in that the counter element (16) is designed as a moving belt or as a rotating roller. .Wrapping machine according to one of claims 16 to 20, characterized in that the profiling element (14) extends over the entire web width. .Wrapping machine according to one of claims 16 to 20, characterized in that the new start of the web is formed by a web strip and the

Profiling element (14) extends only over the width of the web strip. .Wrapping machine according to one of claims 15 to 22, characterized in that the separating device (9) comprises one or more air or water jet nozzles. .Wrapping machine according to one of claims 15 to 23, characterized in that an adhesive device (10) is assigned to the new winding core (3) in the area of the new web start, which applies an adhesive to this winding core (3). .Wrapping machine according to one of claims 15 to 24, characterized in that an adhesive device (10) is assigned to the beginning of the web on the side facing the new winding core (3), which applies an adhesive to the beginning of the web.