CN118992647A

CN118992647A - Method for applying adhesive in slitter-winder and slitter-winder comprising a system for applying adhesive

Info

Publication number: CN118992647A
Application number: CN202410603970.4A
Authority: CN
Inventors: 亚科·哈帕宁
Original assignee: Valmet Technologies Oy
Current assignee: Valmet Technologies Oy
Priority date: 2023-05-16
Filing date: 2024-05-15
Publication date: 2024-11-22
Also published as: FI20235553A1; EP4477590A1

Abstract

The invention relates to a method for applying adhesive in a slitter-winder and a slitter-winder comprising a system for applying adhesive, the slitter-winder comprising a rewinder (20) with at least one rewinder roll (10) for rewinding a fibre web (W) into a customer roll (15) by means of a rewinder nip (N) formed between the rewinder roll (10) and the customer roll (15), in which method at least one adhesive application device (31; 32) is adapted to apply adhesive to an end of the fibre web (W) while the fibre web (W) is moving for attaching the end of the fibre web (W) to the customer roll (15), in which method the adhesive application device (31; 32) is moved over a support element (33; 34) over at least part of the width of the fibre web in a direction of intersection of the running direction of the fibre web (W). In the method the adhesive is applied to the fibre web (W) at most 1000mm before the adhesive on the fibre web (W) reaches the rewinder nip (N).

Description

Method for applying adhesive in slitter-winder and slitter-winder comprising a system for applying adhesive

Technical Field

The present invention relates generally to the production of fiber webs and to the production of customer rolls of fiber webs, particularly in slitter-winders. The invention relates to a method for applying an adhesive in a slitter-winder. The invention also relates to a slitter-winder comprising a system for applying adhesive.

Background

As is known, fiber webs, such as paper and board webs, are manufactured by a plurality of machines that together constitute a fiber web production line, which may be as long as several hundred meters. As is known from the prior art, a fibre web production line generally comprises an assembly formed by a plurality of devices arranged in series on the production line. A typical fiber web production line includes a forming section (including a headbox and a wire section), a press section and a dryer section, and a reel-up. The production line may also comprise other sections and devices for treating and/or finishing the fiber web, such as size presses, coating devices, calenders. The production and processing line also typically includes at least one slitter-winder and roll packaging equipment for forming the customer rolls. Currently, fiber web production lines, particularly for certain fiber web grade products (e.g., for corrugated and liner web grade products), run at such speeds that two slitter-rewinders are required to slit and rewind the fiber web produced in the fiber web production line.

In a fiber web production line, the manufacture of the fiber web is performed in a continuous process. The fiber web completed in the fiber web production line is wound by a reel-up around a winding shaft (i.e. reel spool) into a parent roll, which may have a diameter of more than 5 meters and a weight of more than 160 tons. The purpose of winding is to change the fiber web manufactured in a planar and continuous manner into a more easily handled form. On a reel-up positioned in the main fibre web production line, the continuous process of the fibre web machine is interrupted for the first time and converted into a periodical operation. Reel-ups are thus used in the production of fiber webs for winding the fiber web from the fiber web production line into parent rolls, but reel-ups are also used for winding the fiber web from a coater, calender or corresponding finishing device.

The fibre web being reeled onto the parent roll in the reel-up is of full width, so that it has to be slit in the longitudinal direction into partial fibre webs of suitable width, which are reeled into partial fibre web rolls of suitable fibre web length or diameter for the customer (customer rolls). As is known in the art, slitting and rewinding are performed in suitable independent machines (i.e. slitter-rewinders). Slitting rewinders employ different types of rewinders, such as multi-station rewinders and double-drum rewinders. On slitter-winders of the multi-station rewinder type, the fibre web is guided from the unwind section via guide rolls to the slitting section, where it is slit into partial webs which are further guided from above or from below to one or more rewinder rolls of the rewinder station to be rewound onto a core to become a customer roll. Adjacent portions of the web are rewound on different sides of the rewinding roll/on different rewinding rolls. The multi-station rewinder has one to three rewinder rolls, in which each partial web is rewound into partial web rolls in its own rewinder station. During the rewinding process, a rewinding nip is formed between the rewinding roller and the partial web roll to be rewound. In a twin-roll rewinder, a partial web is rewound into a partial web roll around a rewinder core supported by two rewinders via a nip between the rewinder roll and the partial fiber web roll being formed. In a twin-roll rewinding machine, it is also possible to use a belt device, i.e. a so-called set of belt rollers with one or more belt loops positioned around two guide rollers, as a rewinding drum. During the rewinding process, a rewinding nip is formed between the rewinding drum and the partial web roll to be rewound. As is known in the art, rewinding of the fiber web into customer rolls on slitter-winders can also be performed with a coreless or cored shaft.

As is known from the prior art, in slitter-winders, a parent roll is unwound in an unwinding section in at least one unwinder, at which a full-width fibrous web is slit into several narrower partial fibrous webs, which are rewound into customer rolls around a winding core or around a winding shaft or around a winding core positioned on a shaft, such as a winding shaft. In a slitter-winder, when the customer roll reaches the desired length and diameter, a portion of the web will be slit in the cross-direction. The tail of the partial web is then attached to the surface of the customer roll by applying an adhesive to the surface of the fiber web, which then attaches the tail of the partial web to the surface of the customer roll. When the customer rolls are completed, the slitter-winder is stopped and rolls (i.e. so-called groups) are removed from the machine, after which the process proceeds to the next group of rewinders. These phases are repeated periodically until the paper of the parent roll in the unwinder is exhausted, whereby parent roll replacement is performed, and the operation is restarted with the unwinding of the next parent roll.

In WO publication 2008/148937 an apparatus for applying an adhesive to a moving web is described, the apparatus comprising an application head arranged in connection with a support structure extending across the fiber web in a transverse direction (TRANSVERSE DIRECTION), the support structure comprising a guide extending across the fiber web, in which guide the application head is movably arranged, and which application head has been arranged to form an adhesive strip onto the surface of the fiber web substantially in a transverse direction with respect to the running direction of the fiber web when the fiber web is moving, and to bring the adhesive onto the surface of the fiber web during a decelerating movement of the fiber web. The prior art device comprises means for changing the direction of movement of the application head during application of the adhesive and/or the application device comprises means for changing the speed of movement of the application head during application of the adhesive.

In WO publication 2011/076997 an apparatus in a slitter-winder is disclosed, which apparatus comprises an applicator head arranged to apply an adhesive onto a fibre web surface and a support member by means of which the apparatus is mountable into the slitter-winder and by means of which the apparatus is arranged to be moved substantially in a cross direction with respect to the slitter-winder.

In EP patent publication 2666739B 1a method of applying an adhesive in a slitter-winder of a fiber web machine is disclosed, the slitter-winder comprising: an unwinder for unwinding a parent roll; a slitting section for slitting the fiber web unwound from the parent roll into partial webs; and a rewinder having a rewinder station on at least one rewinder roll for rewinding the partial web into partial web rolls, in which method the adhesive application device is adapted to apply adhesive to the ends of the partial web to attach the ends of the partial web to the partial web rolls, in which method the device is moved over the width of the partial web and in the direction of intersection of the main running directions of the partial web on the support element, in which method the adhesive is applied to the partial web using at least two lateral movements of the at least one adhesive application device and during a first movement of the adhesive application device at least part of the partial web sets is provided with adhesive to attach the tails of the partial web to the rewound partial web rolls and during a second movement of the adhesive application device at least part of the partial web sets not provided with adhesive during the first movement is provided with adhesive.

In most cases, the above-mentioned type of system with a laterally moving type of adhesive application device has proven to work well, but in order to form an adhesive stripe on the surface of the fiber web extending substantially in the cross direction, the running speed of the slitter-winder has to be reduced and the adhesive application is performed at peristaltic (crawling, crawling, slow running) speed, so that the throughput of the slitter-winder is reduced. Although this is a matter of seconds only, when the objective is to perform customer roll production using only one slitter-winder after the fiber web line, then the overall savings in productivity are very considerable.

In the system according to the prior art, the adhesive application device has been positioned before the fibre web is brought into contact with the first rewinder or with the rewinder (hereinafter both denoted by the term "rewinder") in the twin-roll slitter-winder. Typically, the adhesive application means is located near or at the guide roller or spreader roller before the first rewinder of the slitter-winder. In recent years, adhesive substances have improved, and rapidly hardening adhesive substances have become increasingly popular due to their good adhesive properties. Such an improved fast setting substance is not suitable for use in a system according to the prior art, because it takes a long time to apply from the adhesive to the nip between the customer roll and the rewinder, where the adhesive is pressed between the entering fibre web and the almost completed customer roll to attach the tail of the fibre web to the surface of the customer roll. Thus, there is a great need to shorten the time between application of adhesive from the adhesive to the nip between the customer roll and the rewinder.

It is an object of the present invention to create a method of applying adhesive in a slitter-winder, which method is particularly suitable for a twin-roll winder, wherein the disadvantages of the prior art are eliminated or at least minimized.

It is a further object of the present invention to create a slitter-winder, in particular a twin-drum slitter-winder, comprising a system for applying adhesive, wherein the drawbacks of the prior art are eliminated or at least minimized.

Disclosure of Invention

To achieve the above object and the objects that will appear hereinafter, the main features of the method according to the invention and of the slitter-winder according to the invention are as follows.

It should be noted that in the present description and in the claims, the lateral movement of the adhesive application means and the movement of the adhesive application means in a cross direction means a movement of the adhesive application means in a lateral/cross direction with respect to the running direction of the fibre web, but if the fibre web is running during the movement of the adhesive application means, the movement direction will be inclined with respect to the running direction of the fibre web such that at least the last applied adhesive stripe is substantially in a lateral/cross direction with respect to the main running direction of the fibre web. The inclination is defined based on the relation between the running speed of the fiber web and the application speed of the application device. The adhesive application may also be performed such that the adhesive strip(s) are oblique, but the cutting of the fiber web ends may then also be performed obliquely, respectively, to avoid having too long loose fiber web ends on the customer rolls.

It should also be noted that in the present description and in the claims, adhesive means glue or other substance having adhesive properties that can be applied in fluid form, i.e. adhesive applied by means of a nozzle or corresponding device, so as to provide an adhesive stripe on the surface of the moving fibrous web.

Furthermore, it should be noted that in the present description and in the claims, for the sake of clarity, the term "rewinder" refers to the rewinder of a double-drum slitter-winder and the rewinder roller of a multi-station slitter-winder, which are different from the usual usage of these terms in the art.

According to the invention, in a method of applying adhesive in a slitter-winder, the slitter-winder comprises: a rewinder having at least one rewinder drum for rewinding the fiber web into a customer roll through a rewinder nip formed between the rewinder drum and the customer roll; at least one adhesive application device adapted to apply adhesive to the end of the fiber web as it moves for attaching the end of the fiber web to a customer roll, in which method the adhesive application device is moved on a support element over at least part of the width of the fiber web and in a direction intersecting the running direction of the fiber web, wherein in the method the adhesive is applied to the fiber web at most 1000mm before the adhesive on the fiber web reaches the rewinder nip.

According to an advantageous feature of the invention, in the method, the adhesive is applied to the fibre web at an adhesive application point, which is located at a position where the fibre web is running on the surface of the re-winding drum and the angular distance between the re-winding nip and the adhesive application point on the re-winding drum is about 90 degrees.

According to an advantageous feature of the invention, in the method, the adhesive is applied by two adhesive application means, each adhesive application means being movably located on a respective support element, such that one adhesive application means is used for applying the adhesive over a part of the width of the fiber web, advantageously from one edge of the fiber web to about the middle area, and the other adhesive application means is used for applying the adhesive over the remaining width of the fiber web, from about the middle area to the other edge.

According to an advantageous feature of the invention, the adhesive application on the fiber web is overlapping in the middle region.

According to an advantageous feature of the invention, in the method, the adhesive is applied by two adhesive application means, each being movably located on the same support element, such that one adhesive application means is used for applying the adhesive over a part of the width of the fiber web, advantageously from one edge to about the middle area of the fiber web, and the other adhesive application means is used for applying the adhesive over the remaining width of the fiber web, from about the middle area to the other edge.

According to an advantageous feature of the invention, the adhesive application device and the corresponding support element are moved in a substantially vertical movement from a home position, in which the adhesive application device and the corresponding support element are positioned when no adhesive is applied, to an application position, in which the adhesive is applied, and after the adhesive application device and the corresponding support element are returned to the home position by a substantially vertical movement.

According to the invention, the method is used in a twin-roll rewinder in which at least one rewinder is moved in order to provide space between the two rewinders for adhesive application means and supporting elements for applying adhesive to a fibrous web being moved on the surface of the first rewinder.

According to an advantageous feature of the invention, in the double-reel rewinding machine, the adhesive application device and the support member are located at the three o' clock position of the first rewinding drum.

According to an advantageous feature of the invention, in the method, the application device and the support element are moved to the adhesive application position when the slitter-winder is decelerated for a setting change, i.e. the adhesive substance is applied during a lateral movement of the application device on the respective support element from the start position of adhesive application to the end position of adhesive application.

According to an advantageous feature of the invention, in the home position the application device is positioned in the middle area of the respective support element and is moved in the application position to the starting position and after application of the adhesive substance the application device is moved to the home position.

According to the invention, the slitter-winder comprises a system for applying adhesive, in which slitter-winder comprises at least one rewinder roll and which comprises at least one adhesive application device and at least one support element, on which the adhesive application device is movably arranged, wherein in the adhesive application position the adhesive application device and the support element are positioned adjacent to the rewinder roll at three or nine o' clock positions.

According to an advantageous feature of the invention, the adhesive application device and the support element are arranged to be substantially vertically movable between an adhesive application position and a home position in which the adhesive application device and the support element are positioned when no adhesive is applied.

According to the invention, the rewinder is a double-reel rewinder comprising two rewinders, and the adhesive application device and the support element are located between the two rewinders in the adhesive application position.

According to the invention, at least one of the rewinding cylinders is arranged movable so that the space between the two rewinding cylinders is adjustable.

According to an advantageous feature of the invention, the customer roll of the fiber web is configured to be rewound in a rewinder, and the adhesive application device and the support element are positioned below the customer roll.

According to an advantageous aspect of the invention, the adhesive is applied to the moving fibre web near the rewinding nip, the distance travelled by the fibre web after application of the adhesive and before entering the rewinding nip being less than 1000mm.

According to an advantageous aspect of the invention, in a twin-roll rewinder, at least one of the rewinders is arranged movable so as to provide space for adhesive application means between the two rewinders for applying adhesive to the fibrous web being moved on the surface of the first rewinder.

According to an advantageous aspect of the invention, in a twin-roll rewinder, the adhesive application device(s) is/are positioned at the three (3) o' clock position of the first rewinder roll to minimize the space requirement of the adhesive application device, since at this position the fibre web running direction is substantially vertical, so that for the support element(s) only an inclination in the cross direction with respect to the fibre web running direction is required, the adhesive application device(s) on the support element being arranged to be laterally movable.

According to an advantageous aspect of the invention, in a twin-roll rewinder, the adhesive application device(s) is located directly below the customer roll and the adhesive is applied from below onto the surface of the customer roll. This alternative is suitable for use in a double-drum rewinding machine with good space in the machine direction between the two rewinding drums, since this requires the support member to be arranged inclined in the machine direction. Alternatively, the cutting of the fiber web ends should be performed obliquely.

According to an advantageous aspect of the invention, in a multi-station rewinder, the adhesive application device(s) is/are positioned in the nine (9) o' clock position of the first rewinder drum, so that the space requirement of the adhesive application device is minimized, since in this position the fibre web running direction is substantially vertical, so that for the support element(s) only an inclination in the cross direction with respect to the fibre web running direction is required, the adhesive application device(s) being arranged laterally movable on said support element.

According to an advantageous aspect of the invention, in the method, when the slitter-winder is decelerated for a setting change, the adhesive application device(s) and the supporting element(s) are lifted in the vertical direction from an original position, advantageously below the level of the rewinder drum(s), in which original position the adhesive application device(s) are advantageously located in the middle region of the supporting element(s), to an adhesive application position. Advantageously, during the lifting phase, the adhesive application device(s) are still in the original position on the support element(s). When the application device(s) and the support element(s) are in a start position of adhesive application in the vertical direction, the adhesive application device(s) is moved to the start position of adhesive application on the support element(s). The adhesive substance is applied during the movement of the application device(s) on the respective support element(s) from the start position of adhesive application to the end position of adhesive application. After the adhesive is applied, the application device(s) return to the original position on the intermediate region of the support element(s), and then the application device(s) and support element(s) are lowered to the original position.

Advantageously, for the application device(s), the support element(s) are positioned such that the adhesive application device(s) is provided with an acceleration/deceleration distance at the edge of the fiber web such that the adhesive application device is at the application speed at both the start and end positions of the adhesive application.

In a method according to an advantageous aspect of the invention, the adhesive application device and the corresponding support element are moved in a substantially vertical direction from a home position, in which they are positioned when no adhesive is applied, to an application position, in which the adhesive is applied, and after application of the adhesive application device and the support element are returned to the home position.

According to another aspect of the method of the present invention, the adhesive may also be applied during the return movement of the adhesive application device.

In the method according to the invention, an adhesive application device with one adhesive nozzle is advantageously used, but it is also possible to use a device with two adhesive nozzles attached to the adhesive application device, which adhesive application device is movable along a support element which extends part of the width of the web in a cross direction with respect to the running direction of the fiber web.

According to an advantageous aspect of the invention, in particular with respect to wide webs to be slit into partial webs, two adhesive application devices are used for applying the adhesive. The two devices are positioned substantially one after the other in the transverse/cross direction, whereby one device is used for applying adhesive to a part of the width of the fibre web, advantageously from one edge of the fibre web to about the middle area, and the other device is used for applying adhesive to the rest of the width of the fibre web, from about the middle area to the other edge. The movement in the intermediate region advantageously partially overlaps in the intermediate region. In the case of two adhesive application devices, it is advantageous to provide a structure such that the two adhesive applications do not conflict, which provides advantages in the case of maintenance and failure.

According to one aspect of the invention, the device may further comprise two separate adhesive application means, which are separated in the running direction of the fiber web.

By means of the invention and its advantageous features several advantages are achieved: compared to prior art arrangements, the adhesive application location is close to the rewinding nip, saving time for the setting change, since the time for the required deceleration and peristaltic speed for properly applying the adhesive is significantly reduced. The invention thus provides an important advance in that the production of customer rolls can be completed after the fibre web production line, using only one slitter-winder. Furthermore, the invention provides the possibility of using improved and rapidly hardening adhesive substances.

Drawings

However, aspects of the invention, as well as additional objects and advantages thereof, will be best understood from the following description of some example embodiments when read in conjunction with the accompanying drawings, and the invention will be described in more detail hereinafter with reference to the drawings, in which:

An end view of an advantageous example of the invention is schematically shown in fig. 1, with the adhesive application device in the application position.

An end view of the advantageous example of fig. 1 is schematically shown in fig. 2, with the adhesive application device in the home position.

In fig. 3 a side view of the advantageous example of fig. 1-2 is schematically shown, with the adhesive application device in the application position and at the start of the lateral application movement.

In fig. 4a side view of the advantageous example of fig. 1-3 is schematically shown, with the adhesive application device in the application position and at the end of the lateral application movement.

An example for a narrow web is schematically shown in fig. 5.

An example for a wide web is schematically shown in fig. 6.

An advantageous example in a multi-station slitter-winder is schematically shown in fig. 7.

Reference numerals used in the drawings:

10: composite reel

11: Composite reel

15: Customer volume

20: Rewinding machine

31: Application device

32: Application device

33: Support element

34: Support element

A31: adhesive material

A32: adhesive material

L: distance of

N: rewinding nip

P: adhesive application point

S: direction of travel of fiber web

W: fiber web

50: Unwinding machine

51. 52: Splitting machine

53: Stretching roller

Detailed Description

In the following description, unless otherwise indicated, like reference numerals refer to like parts and it is understood that these examples may be modified to accommodate different uses and conditions within the framework of the invention. For clarity, repetition of some reference numerals may be omitted from the figures. In some figures, arrows are used to indicate the direction of rotation of the various major elements of the structure.

Fig. 1-4 schematically illustrate an exemplary embodiment of the present invention in a rewinder 20 of a dual-drum slitter-winder. The fibre web W is led, for example, from an unwinder to a slitting machine, where the fibre web W is slit in the longitudinal direction into narrower fibre webs for the customer rolls 15. After the slitting machine, the fibre web W is led onto the surface of the first rewinding drum 10 and along the surface of the rewinding drum 10 through a rewinding nip N formed between the rewinding drum 10 and the customer roll 15 to be rewound around the customer roll 15. The customer rolls are formed around a core or equivalent multi-reel shaft. The rewinding machine 20 further comprises a second rewinding drum 11 and during the rewinding of the customer roll 15, the customer roll 15 is supported on both rewinding drums 10, 11. Depending on the type of twin-roll rewinding machine, the second rewinding drum 11 can also be formed as a set of belt rollers (belt rolls), with one/more annular belt loops arranged around both rollers.

In the example of fig. 1-4, two adhesive application devices 31, 32 are arranged for applying adhesive. The adhesive application means 31, 32 are arranged on the support elements 33, 34 movably in a cross direction with respect to the longitudinal direction of the fiber web W. The adhesive application means 31, 32 can thus be moved along the support elements 33, 34, respectively, which support elements 33, 34 extend in a cross direction with respect to the running direction of the fiber web W. The support elements 33, 34 are advantageously positioned such that they extend over the respective edges of the fibre web W a distance L, which provides an acceleration/deceleration distance for the adhesive application means 31, 32 to accelerate to/decelerate from the application speed before the application of adhesive substance is started. As shown in fig. 1, the application position of the adhesive application means 31, 32 and the support elements 33, 34 is located at a position of about 3 o' clock as seen from the circumference of the rewinder 10, thus at 90 degrees to the rewinder nip N. As shown, the applicator 31, 32 and the support members 33, 34 are positioned below the customer roll 15. The adhesive application means 31, 32 and the support elements 33, 34 may also be positioned such that adhesive is applied from below onto the surface of the customer roll 15, as indicated by the dashed line locations in fig. 1. Advantageously, the distance between the adhesive application point P and the rewinding nip N, measured as the distance travelled by the fiber web W between the adhesive application point P and the rewinding nip N, is less than 1000 mm. This allows the adhesive substance applied on the surface of the fiber web W to enter the rewinding nip N while the adhesive substance is still functional (i.e. not hardened) for attaching the tail of the fiber web W to the surface of the customer roll 15. When applying adhesive substance to the surface of the fiber web W at the rewinder 10, this distance depends on the diameter of the rewinder and is therefore less than 1/4 of the diameter length of the rewinder 10. In case the space between the two rewinders 10, 11 is narrow, one or both rewinders 10, 11 may be arranged to be moved away from the other or from each other, thereby providing the space required for the application means 31, 32 and the support elements 33, 34 between the two rewinders 10, 11. As shown in fig. 2, the original position of the adhesive application means 31, 33 and the support elements 33, 34 is advantageously located below the adhesive application position, such that the adhesive application means 31, 32 and the support elements 33, 34 can be moved in a substantially vertical direction between the application position and the original position. As shown in fig. 3-4, when applying the adhesive substance, the application means 31, 32 are moved in a cross direction along the support elements 33, 34, i.e. transversely in the width direction of the fiber web W, to provide adhesive strips a31, a32 (fig. 5-6) on the surface of the fiber web W from the starting position shown in fig. 3 to the ending position shown in fig. 4. After the adhesive has been applied, the application devices 32, 32 are correspondingly moved back along the support elements 33, 34 and returned to the starting position (fig. 3).

The transverse/crosswise position of the support element 33 of the adhesive application device with respect to the fibre web W is schematically shown in fig. 5 for narrow webs of 2m-7 m. The support elements 33 of the adhesive application device are positioned in the transverse/crosswise direction with respect to the running direction S of the fiber web W. During the movement of the adhesive application device, the support element 33 is tilted with respect to the running direction S of the fiber web W, while the fiber web W is running, so that the applied adhesive strip a31 is essentially in a transverse/crosswise direction with respect to the running direction S of the fiber web W.

The transverse/cross-directional position of the support elements 33, 34 of the adhesive application device with respect to the fibre web W is schematically shown in fig. 6 for a wide web of 7m-12 m. The support elements 33, 34 are positioned in the transverse/intersecting direction with respect to the running direction S of the fiber web W. The support elements 33, 34 are inclined with respect to the running direction S of the fibre web W during the movement of the adhesive application device, such that the applied adhesive strips a31, a32 are substantially transverse/crosswise with respect to the running direction S of the fibre web W. The support elements 33, 34 are positioned substantially successively in the transverse/intersecting direction, such that one adhesive application device 31, 32 on the support element 33, 34 is used for part of the width of the fiber web W, while the other adhesive application device 31, 32 is used for the remaining width of the fiber web W. As shown, the support elements 33, 34 advantageously partially overlap in the intermediate region.

Fig. 7 schematically shows an example in a multi-station slitter-winder, in which one winding drum 10 is used. The fibre web W is led, for example, from the unwinder 50 to a slitting machine 51, 52, in which the fibre web W is slit in the longitudinal direction into narrower fibre webs for the customer rolls 15. The fiber web W is guided onto the surface of the rewinding drum 10 by a guide roller or spreader roller 53 and passes along the surface of the rewinding drum 10 through a rewinding nip N formed between the rewinding drum 10 and the client reel 15 to be rewound around the client reel 15. The customer roll is formed around a core or equivalent rewind reel. Multi-station rewinder 20 may also include two rewinder nips along the circumference of rewinder 10, typically at about 10 to 11 o 'clock and 1 to 2 o' clock. The multi-station rewinder may also comprise two rewinders, one for one set of customer rolls and one for the other set of customer rolls. In the example of fig. 7, two adhesive application devices 31, 32 are arranged for applying adhesive. In the case of a multi-station rewinder with two rewinding nips on one rewinder, one adhesive applicator may apply adhesive to the fibrous web directed to one customer roll and the other adhesive applicator may apply adhesive to the fibrous web directed to the other customer roll. In the case of a multi-station rewinding machine with two rewinding drums, two sets of adhesive applying devices can be provided, one set associated with one rewinding drum and the other set associated with the other rewinding drum. The adhesive application means 31, 32 are arranged on the support elements 33, 34 movably in a cross direction with respect to the longitudinal direction of the fiber web W. The adhesive application means 31, 32 can thus be moved along the support elements 33, 34, respectively, which support elements 33, 34 extend in a cross direction with respect to the running direction of the fiber web W. The application position of the adhesive application means 31, 32 and the support elements 33, 34 is located at about 9 o' clock from the circumference of the rewinder 10 and thus at 90 degrees to the rewinder nip N. Advantageously, the distance between the adhesive application point P and the rewinding nip N, measured as the distance travelled by the fiber web W between the adhesive application point P and the rewinding nip N, is less than 1000 mm. Naturally, this distance depends on the diameter of the rewinding drum and is therefore less than 1/4 of the length of the diameter of the rewinding drum 10. This allows the adhesive substance applied on the surface of the fiber web W to enter the rewinding nip N, attaching the tail of the fiber web W to the surface of the customer roll 15 while the adhesive substance is still functional (i.e. not hardened). The original position of the adhesive application means 31, 32 and the support element 33, 34 is advantageously located below the adhesive application position such that the adhesive application means 31, 32 and the support element are movable in a substantially vertical direction between the application position and the original position.

In this method, the lateral movement of the adhesive application means 31, 32 is used to apply adhesive to the fiber web W. The adhesive is provided during movement of one of the adhesive application means 31, 32 over at least part of the width of the fibre web W (advantageously about half the width of the fibre web W) for attaching the tail of the fibre web W to the customer roll 15 of the rewinder, and the remaining width of the fibre web W (advantageously about the other half of the width of the fibre web) is provided with adhesive during movement of the other of the adhesive application means 31, 32.

In the foregoing description, although some functions have been described with reference to certain features, these functions may be performed by other features, whether described or not. Although features have been described with reference to certain embodiments or examples, those features may also be present in other embodiments or examples, whether described or not. The invention has been described above by reference to only a few advantageous examples, to which the invention is not limited. Many modifications and variations are possible in the present invention defined in the following claims.

Claims

1. A method of applying adhesive in a slitter-winder comprising a rewinder (20) with at least one rewinder reel (10) for winding a fibre web (W) into a customer reel (15) by means of a winding nip (N) formed between the rewinder reel (10) and the customer reel (15), characterized in that in the method at least one adhesive application device (31, 32) is adapted to apply adhesive to an end of the fibre web (W) while the fibre web (W) is moving, for attaching the end of the fibre web (W) to the customer reel (15), in that in the method the adhesive application device (31, 32) is moving in a cross direction of the running direction of the fibre web (W) over at least part of the width of one or more fibre webs, in that in the method at least one roll of adhesive (W) is applied to the two reels (11, 33, 34) before reaching the winding nip (N) on the fibre web (W), in the form of adhesive is applied to the two reels (11, 33, 34) in the two reels (11, 11) before the adhesive is applied in the two-reel (W) in the method, for applying adhesive to the fibrous web (W) being moved on the surface of the first complex reel (10).

2. A method according to claim 1, characterized in that in the method adhesive is applied to the fiber web (W) at an adhesive application point (P), which adhesive application point (P) is located at a position where the fiber web (W) is running on the surface of the complex reel (10), and the angular distance between the re-reeling nip (N) and the adhesive application point (P) on the complex reel (10) is about 90 degrees.

3. A method according to claim 1 or 2, characterized in that in the method the adhesive is applied by means of two adhesive application devices (31, 32), each adhesive application device being movably located on a respective support element (33, 34), such that one adhesive application device (31) is used for applying adhesive over a part of the width of the fibre web (W), advantageously from one edge to about the middle area of the fibre web (W), and the other adhesive application device (32) is used for applying adhesive over the remaining width of the fibre web (W), from about the middle area to the other edge.

4. A method according to claim 3, characterized in that the adhesive application on the fiber web (W) is overlapping in the intermediate zone.

5. A method according to any one of claims 1-4, characterized in that in the method the adhesive is applied by two adhesive application means (31, 32), each adhesive application means being movably located on the same support element (33, 34), such that one adhesive application means (31) is used for applying adhesive over a part of the width of the fibre web (W), advantageously from one edge to about the middle area of the fibre web (W), and the other adhesive application means (32) is used for applying adhesive over the remaining width of the fibre web (W), from about the middle area to the other edge.

6. Method according to any one of claims 1 to 5, characterized in that the adhesive application device (31, 32) and the respective support element (33, 34) are moved in a substantially vertical movement from a home position, in which the adhesive application device (31, 32) and the respective support element (33, 34) are positioned when no adhesive is applied, to an application position, in which adhesive is applied, and after the adhesive application device (31, 32) and the respective support element (33, 34) are returned to the home position by a substantially vertical movement.

7. A method according to any one of claims 1 to 6, characterized in that in the twin-roll rewinding machine the adhesive applying device (31, 32) and the supporting element (33, 34) are located in the three o' clock position of the first rewinding drum (11).

8. Method according to any one of claims 1 to 7, characterized in that in the method, the adhesive application device (31, 32) and the support element (33, 34) are moved to the adhesive application position when the slitter-winder is decelerated for a setting change, adhesive substance being applied during a lateral movement of the application device (31, 32) on the respective support element (33, 34) from a start position of adhesive application to an end position of adhesive application.

9. Method according to any one of claims 1 to 8, characterized in that in the home position the adhesive application means (31, 32) are located in the middle area of the respective support element (33, 34), and in that in the application position the application means are moved to a starting position, and after application of the adhesive substance the application means are moved to the home position.

10. Slitter-winder comprising a system for applying adhesive, in which slitter-winder (20) comprises at least one rewinder (10) and which system for applying adhesive comprises at least one adhesive application device (31, 32) and at least one support element (33, 34), which adhesive application device (31, 32) is movably arranged on the support element (33, 34), characterized in that the rewinder (20) is a twin-roll rewinder comprising two rewinders (10, 11) and that the adhesive application device (31, 32) and the support element (33, 34) are located between the rewinders (10, 11) in an adhesive application position, in which at least one of the rewinders (10, 11) is arranged movable such that the distance between the rewinders (10, 11) can be adjusted, the adhesive application device (31, 32) and the support element (33, 34) being located adjacent to the rewinder (10) in three or nine o' clock positions.

11. Slitter-winder according to claim 10, characterised in that the adhesive application device (31, 32) and the support element (33, 34) are arranged to be movable substantially vertically between the adhesive application position and a home position in which the adhesive application device (31, 32) and the support element (33, 34) are positioned when no adhesive is applied.

12. Slitter-winder according to claim 10 or 11, characterised in that a customer roll (15) of fibre web (W) is arranged to be wound in the winder and that the adhesive application means (31, 32) and the support element (33, 34) are located below the customer roll.