A system and a method for transferring a tail of a web

Abstract

A system (1000) for transferring a tail (101) of a cellulose fibrous based web from a first unit (100) to a second unit (200), the tail (101) being formed by forwarding the web from the first unit (100) and slitting the web to form a tail (101). The system (1000) comprises a tail forwarding device configured to move the tail to a tail conveyor device (110), said tail conveyor device being adapted to forward the tail to the second unit, and a tail guide device (120) comprising a tail guide element (124) movable between a guiding position and a non-guiding position.

Description

[0001] A SYSTEM AND A METHOD FOR TRANSFERRING A TAIL OF A WEB

[0002] Field of the invention

[0003] The present invention relates to a system for transferring a tail of a cellulose based fibrous web from a first treatment unit to a second treatment unit.

[0004] The present invention further relates to a method of transferring a tail of a cellulose based fibrous web from a first treatment unit to a second treatment unit.

[0005] Background art

[0006] When forming and drying a web-formed material, such as cellulose pulp web, the web-formed material is treated in different units. For instance, a cellulose pulp production plant may include a wet forming station, in which a slurry of for example cellulose fibers are treated to form a wet cellulose based fibrous web, and a pulp dryer in which the wet web is dried by hot air blown onto the web by means of blow boxes. After the web has been dried, it may be transferred to a cutter unit or a reeler unit.

[0007] It is necessary to transfer the web between each unit in order for the web to go through each necessary stage.

[0008] When transferring a web it is common to first form a narrow tail, also called a leader, at the first treatment unit. The tail is then transferred into the second treatment unit. When a tail has been successfully transferred from a first treatment unit to a second treatment unit, the tail may be gradually widened such that a web of full width can be passed from the first treatment unit to the second treatment unit. Transferring the web is not always successful and in some instances several attempts may have to be made until the transferring of the tail is successful.

[0009] Attempts have been made to improve the transferring techniques for a web between treatment units, however there is still a lack of efficiency and further improvement is needed. For example, W02007 / 108738 discloses a device for transferring a tail from a first treatment unit to a second treatment unit.

[0010] Summary of the invention

[0011] An object of the present invention is to provide a system and a method of transferring a tail from a first treatment unit to a second treatment unit, without exposing operators to hazards. Specifically, an object of the present invention is to provide a system for transferring a web from a dryer unit to a cutter unit or a reeler unit, without losing efficiency of the whole system and plant.

[0012] These objects are achieved by a system having the features defined in claim 1 . The invention is defined by the appended claims only. Preferred embodiments will be evident from the dependent claims.

[0013] More specifically, according to a first aspect of the disclosure, there is provided a system for transferring a tail of a cellulose fibrous based web from a first unit to a second unit, the tail being formed by forwarding the web from the first unit and slitting the web to form a tail, said system comprising a tail forwarding device configured to move the tail to a tail conveyor device, said tail conveyor device being adapted to forward the tail to the second unit, and a tail guide device comprising a tail guide element movable between a guiding position and a non-guiding position.

[0014] The system provides several advantages, amongst efficient transfer of a tail from a first unit to a second unit. The system further reduces risk of the need to have manual labor in order to transfer the tail.

[0015] According to a second aspect, there is provided a system for transferring a tail of a cellulose fibrous based web from a first unit to a second unit, the tail being formed by forwarding the web from the first unit, slitting the web to form a tail, and allowing the web to travel substantially vertically downwards from a first pulley, said system comprising a tail pick-up device adapted to move the tail into a cutting position a tail cutting device adapted to cut said tail at the cutting position, a tail conveyor device adapted to catch the tail cut at the cutting position and forwarding the cut tail to the second unit, and a tail guide device comprising a tail guide element movable between a guiding position and a non-guiding position.

[0016] When the tail is positioned in the tail cutting position and caught in the tail conveyor device, the tail has a predetermined first lateral position. It is important that the tail stays in the tail conveyor device through the transferring of the tail to the second unit. When the tail has reached the second unit, and the tail is positionally controlled for the full distance between the first and second unit, the tail can be released from the tail conveyor device, and be widened for efficient transferring to the second unit.

[0017] A further advantage of this system is that it provides for a low tension in the tail when transferring it from the first treatment unit to the second treatment unit.

[0018] In some examples the tail guide element may be configured to maintain the web in a predetermined lateral position in the tail conveyor device, in said guiding position, during tail transferring.

[0019] The tail guide element is arranged to, in the guiding position, to control the lateral position of the tail. The tail guide element limits lateral movement of the tail in order to maintain the tail in the predetermined position. If the tail moves too much in a lateral direction, the tail transfer may fail, and manual labor might be needed to continue the transferring from the first unit to the second unit. In the non-guiding position, the tail element does not control the lateral position of the tail. In the non-guiding position, the tail can be moved out from the tail conveyor device, and thereafter the tail can be gradually widened and the transfer continued.

[0020] In some examples the tail guide element may be pivotable between said guiding position and said non-guiding position. In other examples, the tail guide element may be linearly movable between the guiding position and the non-guiding position This is advantageous, because it provides an efficient movement of the tail guide element between the two positions.

[0021] In some examples the tail guide element is a plate, which provides for a space efficient solution. In other examples, the tail guide element may have any shape, such as a sphere, or a rod or any other suitable shape. The plate may have a convex surface towards the tail conveyor device. As described, it is important that the tail is properly transferred between the first unit and the second unit. The tail being made from a cellulose fiber, may be fragile depending on durability and dryness of the material. As such, the tail may be at risk of unintentional tearing at the tail conveyor device if the tail comes into contact with a sharp edge. For this reason, there is a great advantage of a tail guide element plate to have a convex surface towards the tail conveyor device. This may reduce the risk of any unintentional tear of the tail. The plate may thus be curved or bulged in a direction that has the curved portion towards the tail. Thereby the edge of the plate can be bent away from the tail. By reducing the risk of the tail tearing at the tail conveyor device, there is a reduced risk of operators needing to manually move the tail, and stepping into the zone of the transferring system. Thereby reducing the risk of hazard for operators. Moreover, also advantageously improving the efficiency of transferring the tail between the first and the second unit.

[0022] In some examples, the tail guide device comprises an actuator arranged to move the tail guide element between said guiding position and said non-guiding position. Preferably, the actuator is a linear actuator. By having an actuator moving the tail guide element, there is provided a reduced risk of hazard to operators, by the removal of manual movement of a part of the transferring system. The actuator may be any suitable actuator. For example the actuator may be a hydraulic actuator, a pneumatic or an electric actuator.

[0023] In some examples the system may be configured to transfer a tail that has dryness in the range of 45 to 93% Bone Dry (BD).

[0024] In some examples the system may be configured to transfer a tail that has dryness in the range of 45 to 55% Bone Dry (BD). This is for example in a system where the first unit is a wet forming station. In such examples, the second unit may be a cellulose pulp web dryer and preferably a cellulose pulp dryer operating in accordance with the air borne principle. The system provided herein may advantageously provide a transferring system of a tail between a wet forming unit and a cellulose pulp web dryer. In some examples the first unit is a cellulose pulp dryer and preferably a cellulose pulp dryer operating in accordance with the air borne principle. In such examples the system may be configured to transfer a tail that has dryness in the range of 85 to 95% Bone Dry (BD). In a preferred example, the system may be configured to transfer a tail that has dryness in the range of 90 to 93% Bone Dry (BD).

[0025] In some examples the system may be configured to transfer a tail that is adapted to stand a tensile force of 50 to 2600 N.

[0026] In some examples the second unit is a reeler unit, also referred to as a web winding unit. The system provided herein may thus advantageously provide a transferring system of a tail between a drying unit and a reeler unit. There are specific aspects needed to consider when transferring a tail from a drying unit because the web has different conditions from a wet web. For instance, a dry web often tends to move laterally to a greater extent than a wet web.

[0027] A tail typically has a width of about 100 mm and a thickness of 0.8 to 4 mm. Such a tail could typically stand a tensile force of maximum 50-2600N.

[0028] Thus the tail may be transferred without necessitating manual interference, without exposing the tail to excessive tensions and with a large chance of being successful in each attempt to transfer the tail.

[0029] According to a third aspect of the inventive concept there is provided a method of transferring a tail from a first treatment unit to a second treatment unit, said method comprising the steps: forwarding the tail from the first unit and slitting the web along its longitudinal direction to form a tail, moving the tail to a tail conveyor device, and guiding, by means of a tail guide device comprising a movable tail guide element, the tail in a predetermined path from the tail conveyor device towards the second unit.

[0030] In some examples the method may comprise moving the tail to a cutting postition, cutting the tail along its transverse direction, and catching the tail by means of the tail conveyor device. In some examples the method may comprise maintaining, when the movable tail guide element is situated in a guiding position, the tail in a predetermined lateral position in the tail conveyor device, in said guiding position, during tail transferring.

[0031] In some examples, the second unit is a cutter unit or a reeler unit.

[0032] According to a fourth aspect, there is provided a tail guide device for controlling a tail made from a cellulose based web in a conveyor device, said tail guide device comprising a tail guide element movable between a guiding position and a non-guiding position to control said tail in said guiding position.

[0033] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / an / the [element, device, component, means, step, etc]" are to be interpreted openly as referring to at least one instance of said element, device, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

[0034] Brief description of the drawings

[0035] The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non-limiting detailed description of preferred embodiments of the present invention, with reference to the appended drawings, where the same reference numerals will be used for similar elements, wherein:

[0036] Fig. 1 is a schematic side view and shows a first unit, a second unit and a device for transferring a tail.

[0037] Fig. 2 is a schematic side view and illustrates how the tail has been moved to a cutting position.

[0038] Fig. 3 is a schematic side view and illustrates how the tail has been cut and caught by a tail conveyor device forwarding it to the second treatment unit.

[0039] Fig. 4a is a schematic side view of a tail conveyor device with a tail guide device in a non-guiding position. Fig. 4b is a schematic side view of a tail conveyor device with a tail guide device in a guiding position.

[0040] Description of embodiments

[0041] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and fully convey the scope of the invention to the skilled person.

[0042] In a production plant for making dried pulp, a cellulose based fiber may go through different treatment units. Some examples of treatment units are amongst others: a wet forming station, different types of dryer units, a web cutting unit, a web reeling unit, a web packing station.

[0043] Generally a web is formed of the cellulose based fiber that is treated in the different treatment units in order to manufacture the desired product. The web possesses different characteristics such as strength and dryness level depending on where in the plant the web is being treated. In a wet forming station, the dryness may for example be between 45-55% Bone Dry. After a drying unit the same web may have a dryness range of 90-95% Bone Dry. Hence, the web with a higher dryness level will have different characteristics form the web with a lower dryness level.

[0044] Within the production plant, the web is moved or transferred between the different units. The transferring may be done by manual labor, or by automatic transfer devices or transfer systems. The transfer systems are advantageously adapted to handle the different types of webs that are present in a production plant with regards to the characteristics of the web. By the use of automatic transfer systems, improved efficiency of a production plant may be achieved.

[0045] The concept of the herein disclosed inventive concepts is to provide a transfer system to transfer a web between two treatment units in a production plant. The web is forwarded from a first treatment unit, whereafter, the transfer system handles the web in the area between the two treatment units. The transfer system then guides the web into the second treatment unit.

[0046] When the web has been connected between the first and the second treatment unit, the transfer system, is uncoupled from the web, and the web can be fully transferred to the second unit.

[0047] The inventive transferring system will be disclosed in further detail with regards to the figures presented herein.

[0048] Fig. 1 shows a system comprising two treatment units in a production plant adapted for production of dried pulp, such as chemical pulp, mechanical pulp, fluff pulp or dissolving pulp. The production plant comprises a first unit 100 and a second unit 200a, 200b. It is to be understood that a production plant may comprise a number of different units. The first unit 100 may be a pulp web dryer 102, and the second unit 200a, 200b may be a cutter unit 202 or a reeler unit 204. When the second unit 200a, 200b is a reeler unit 204, the cutter unit 202 may be bypassed. The web can thereby for example be arranged to “fly over” the cutter unit 202 to reach the reeler unit 204, as schematically illustrated by the dashed line 10.

[0049] In the production plant, a cellulose fibrous material is first treated in the first unit 100, whereafter a transfer system will transfer the cellulose fibrous material to the second treatment unit 200 wherein the cellulose fibrous material will be treated again. The first unit 100 and second unit 200 preferably provide different treatments to the cellulose fibrous material.

[0050] In examples, where the first unit is a drying unit 102, a pulp web is dried to reach a predetermined dry solids content. The dry solids content is often of about 90% Bone Dry. The preferred dryness range is 90-93% Bone Dry. The dryness range after a cellulose fibrous material has been through a dryer is often 85-95% Bone Dry. After the cellulose fibrous material has been dried, it is transferred to a second unit 200 that may be a cutter unit 200a which may cut the cellulose fibrous material into predetermined sized sheets. In other examples the second unit is a reeler unit 202. In the reeler unit, the fiber web is wound up. After the first unit 100 or dryer 102, the web of cellulose fibrous material is supposed to be forwarded indicated by the dashed web 10 in Fig.1 to the second unit 200a, 200b.

[0051] In between the first unit 100 and the second unit 200, there is disclosed a system 1000 adapted for transferring a tail forwarded from the first unit 100 to the second unit 200. The system for transferring a tail is easy to install between different treatment units in a production plant. This is advantageous because there are many different types of treatment units in a pulp production plant.

[0052] Turning to Fig. 2 a closer view is shown of a tail transferring system 1000.

[0053] A web is shown leaving the first unit 100. The web has a width, in some examples the width of a web leaving a treatment unit may have a width anywhere up to 10 meters. The web may have a width wider than 10 meters. Transferring a web having a great width may be difficult. Thus, in order to facilitate the transfer of the web, a tail 101 is formed after the web has left the first unit 100.

[0054] The tail 101 is formed by a tail cutter 60 slitting the web along its longitudinal direction upstream of a first pair of rolls 106 located adjacent to the first treatment unit 100. The tail 101 usually has a width of about 100 mm. The width of the tail may vary depending on characteristics of the web to be transferred. The purpose of forming a tail 101 is to be able to transfer the web from the first unit 100 to the second unit 200 in an effective manner, since it may be difficult to transfer a wide web between two units.

[0055] After the tail 101 has been formed, the tail 101 is picked up by the transferring system 1000. To this end, the tail transferring system 1000 comprises a forwarding device configured to move the tail 101 to a conveyor device 110. In this embodiment the forwarding device comprises a pick-up device 108 and a cutting device 112.

[0056] In a first stage, the tail 101 is picked-up by a pick-up pulley 109 of the pick-up device 108. The pick-up device 108 is arranged to move the tail towards a cutting position. By allowing the tail to be placed in a substantially vertically downwards direction from the pick-up device 108, the pick-up device 108 is capable of moving the tail into the desired cutting position.

[0057] In the cutting position, the tail is cut in order for a tail conveyor device 110 to catch the tail 101 to continue the transfer towards the second unit 200 The tail conveyor device 110 is supposed to, according to per se known principles, catch the tail 101 by means of a threading tape (not shown), also referred to as a threading belt, for further transferring.

[0058] The cutting position is located near the tail conveyor device 110. The tail conveyor device is configured to catch the tail after it has been cut and continue to transfer the tail towards the second unit 200. The cutting device 112 is located adjacent to the tail conveyor device. The cutting device 112 may comprise a set of knifes arranged to slit the tail 101 along a transverse direction of the tail.

[0059] The cutting device 112 cuts the vertically downwards hanging tail 101 . The tail is cut in a horizontal direction of the vertically downwards hanging tail 101 . When the cutting device has cut the tail 101 , the tail conveyor device 110 catches the tail and moves it forward in the system along a determined path towards the second unit 200. The cutting device 112 may comprise a set of knives to create a clean cut. The cutting device 112 is preferably synchronous with the tail conveyor device 110 in order for the tail conveyor device 110 to catch the tail 101 after it has been cut.

[0060] In some examples the system may comprise a stabilizer 114 arranged to stabilize the tail 101 before the tail 101 is moved into the cutting position. The stabilizer 114, and the tail pick-up device 108 preferably work in synchrony to place and guide the tail 101 into the correct cutting position. By use of the stabilizer 114, the tail can be controlled from two locations, the stabilizer 114 and the pick-up device 108. Thereby the system can be provided with improved efficiency of cutting the tail 101 . A clean cut can be achieved which can facilitate the catching of the tail into the tail conveyor device 110.

[0061] Turning to Fig. 3 showing a view in which the tail conveyor device 110 has caught the tail 101 after cutting, and the tail 101 is following a path 155 of the tail conveyor device 110 towards the second unit 200. The path 155 is a predetermined path between the tail conveyor device 110 and a second pulley 160 adapted to guide the tail 101 towards the second unit 200.

[0062] When the tail is entering the tail conveyor device 110, it has been forwarded from the first unit 100. As stated, in some examples the first unit is a pulp drying unit. This entails that the web, and thereby the tail 101 to be transferred to the second unit 200 has characteristics of a dry tail 101 . The dryness range of pulp gives the tail 101 different strengths and characteristics. When the tail 101 is coming from a dryer unit, the dryness may be 85-95% Bone Dry, preferably 90-93% Bone Dry. The dryness of the tail, may make the tail stiff, which may cause the tail to move around in the trail conveyor device 110. The web leaving the dryer, preferably has a basis weight of 700-1500 g / m2BD, and a thickness of 0.8 to 4 mm.

[0063] The tail 101 may be arranged to stand a tensile force of 50-2600 N.

[0064] In the figure, the tail 101 is depicted as following the path 155 of the tail conveyor device 110. The tail has a predetermined lateral position in said path 155. The predetermined lateral position is aligned with the tail conveyor device 110 and a second pulley 160 of the system 1000. It is important that the tail can be kept in the predetermined lateral position and thereby the predetermined travel path 155 in order to achieve an efficient transfer. If the tail 101 is laterally displaced, it can move out from the path 155, and manual labor may be needed in order to connect the tail 101 to the second pulley 160.

[0065] Because of the characteristics of a dry web, a dry tail 101 may be more inclined to move in the transverse / lateral direction. Thereby the tail 101 may have a hard time keeping to the predetermined path between the tail conveyor device and the second pulley 160. Due to the dry web having a stiffness it may be inclined to vibrate in the transverse direction. For this reason, the tail transferring system 1000 comprises a tail guide device 120. Preferably the tail conveyor device comprises the tail guide device 120.

[0066] The tail guide device 120 is connected to the tail conveyor device 110. The tail guide device 120 may be attachable to the tail conveyor device 110. The tail guide device 120 comprises a tail guide element 124. The tail guide element 124 is adapted to have a guiding position, and a non-guiding position. In the non-guiding position, the tail guide element 124 does not interfere with the tail conveyor device 110 or the tail 101 .

[0067] The tail guide element 124 is adapted to, in the guiding position, maintain the tail 101 in said predetermined path 155, and / or in said predetermined lateral position. The tail guide element 124 is thus configured to, in the guiding position, prevent the tail 101 from moving out of the predetermined lateral position. When the tail runs through the system and through the tail conveyor device, the tail may move in the lateral motion. The tail may travel out of the tail conveyor device and thereby it may need to be manually repositioned in the tail conveyor device. The tail guide element is adapted to abut the tail when the tail travels towards a side of the tail conveyor device comprising the tail guide element 124. The tail guide element can thereby prevent the tail from exiting the tail conveyor device 110 and the predetermined path 155 by guiding the tail 101 .

[0068] When the tail guide element 124 is situated in the non-guiding position, the tail can move freely out of its pre-determined lateral position.

[0069] In order to control the dryness range of the tail 101 , the system may comprise a sensor (not shown) configured to determine the dryness level of the tail 101. The sensor may be connected to a control unit for controlling a spray unit 132. The spray unit 132 may preferably be located upstream the first unit 100. The spray unit 132 may be arranged to spray the dry web with a fluid in order to achieve less dryness in the web. Preferably, the spray unit 132 is configured to spray water onto the web. Thus the system may control the dryness level of the tail in order to achieve efficient dryness level for the tail to be efficiently transferred.

[0070] After the tail 101 has been properly transferred from the first unit 100 through the transfer system 1000 to the second unit 200, the tail 101 is intended to be widened. The tail 100 is only made and kept with a short width to facilitate the transfer of the web between the two treatment units.

[0071] In order for the tail and web to be widened, the tail is moved out from the threading tape. The tail conveyor device 110 is mounted on a tail conveyor beam 64 which is turnable in the horizontal plane around a pivot axis by means of a joint 150. By moving the tail conveyor beam 64 in the horizontal plane, the tail conveyor device 110 is moved such as to allow the tail to move out of the tail conveyor device 110. Thereby the tail is transferred from the first unit to the second unit and removed from the transferring system.

[0072] It is to be understood that the joint 150, and the movement of the tail conveyor beam 64, may also play a part in placing the tail into the cutting position when the tail is to be cut before entering the tail conveyor device.

[0073] In some examples the system comprises a third pulley 140 mounted on the conveyor beam 64 in order to further facilitate the release of the tail from the conveyor device 110.

[0074] The third pulley 140 is mounted vertically under the second pulley 160 which is also mounted on the conveyor beam 64. The second pulley 160 and the third pulley 140, which may have the same radius, are arranged along a common vertical axis. The third pulley 140 is arranged to pivot around the same pivot axis as the second pulley 160, i.e. around the pivot axis formed by the joint 150. Preferably, the second pulley 160 and the third pulley 140 have the same radius and are situated such that the rotational axis of each of the second pulley 160 and the third pulley 140 is situated at distance from the pivot axis of the joint 150. More preferably, the second pulley 160 and the third pulley 140 have the same radius and are situated such that the rotational axis of each of the second pulley 160 and the third pulley 140 is situated at a distance from the pivot axis of the joint 150 that corresponds to the pulley radius, as illustrated in Fig. 3.

[0075] The third pulley 140 is the return point for the tail threading tape that carries the tail 101 from the tail conveyor device 110 to the second unit 200 along the tail path 155. By the third pulley 140 being located along the same axis as the second pulley 160, the horizontal turning of the conveyor beam 64, and thereby the release of the tail from the conveyor device 110, is facilitated.

[0076] Fig. 4a-4b are a close up views of the tail conveyor device 110.

[0077] As shown, a tail guide element in the form of a plate 124 is attached to a first pulley 122 of the tail conveyor device 110. The shown example depicts a half circle shape of the plate 124. The plate 124 is arranged to move between the non-guiding position and the guiding position via a pivotable motion. In the non-guiding position, the plate 124 does not extend outside the surface of the first pulley 122.

[0078] In Fig. 4a the tail guide element 124 is depicted in the non-guiding position. Thus allowing for the tail 101 to enter or be released from the tail conveyor device 110.

[0079] Fig. 4b shows the tail guide element 124 in the guiding position. The plate 124 is then pivoted such that a surface of the plate 124 extends beyond the size and surface of the first pulley 122. When the plate is in the guiding position, the plate surface facing the inside of the tail conveyor device 110 prevents the tail from being laterally displaced in the path of the tail conveyor device 110.

[0080] The plate is preferably creased or bent to form a convex surface towards the tail. Any sharp edges facing the tail in the tail conveyor device 110 may cause the tail to break or tear which may stop the transfer if the tail travels towards the tail guiding element 124. Therefore it is advantageous to have a smooth surface of the tail guide element 124 facing the tail.

[0081] The plate 124 may comprise a cut-out 128 arranged to allow a knife of the cutting device to cut the tail, when the plate 124 is in the guiding position. Such a configuration allows for versatility in that the tail can be cut with the tail guide element 124 in both the guiding and non-guiding position.

[0082] In the depicted example the tail guide element 124, the plate 124, is controlled by a linear actuator 130. The actuator 130 may be any suitable actuator for example, hydraulic, or linear, or electric, or piezoelectric, or pneumatic etc. The tail guide device 120 may be partially integrally formed with the tail conveyor device 110. For example, a housing for the actuator may be integrally formed with the tail guide device 120. In other examples, the tail guide device 120 is a separate unit connected to the tail conveyor device 110.

[0083] As is evident from the figure, a fixed guiding plate 126 may be located at an opposite side of the tail conveyor device 110 to the tail guide device 120. The fixed guiding plate 126 has a guiding position arranged to prevent the tail from exiting the tail conveyor device 110. The fixed guiding plate 126 is preferably arranged to prevent the tail from moving in a lateral direction outside the tail conveyor device in the direction opposite to the movable tail guiding element 124.

[0084] The fixed guiding plate 126 and the movable tail guiding element 124 may advantageously work in synchrony. Thereby the system can provide full control of the lateral placement of the tail in the tail conveyor device 110.

[0085] A system having two guiding devices, may provide a low risk tail guide transfer, due to the low risk of the tail exiting the tail conveyor device 110.

[0086] In some examples, the system may comprise two movable tail guide elements, arranged on opposite sides of the tail conveyor device 110 as seen in the longitudinal direction thereof, for controlling the tail 101 at the tail conveyor device 110. In such examples, the system may not have a fixed guide element.

[0087] In examples when the first unit is a wet forming station, the web leaving the wet forming station preferably has a dryness range of 45-55% Bone Dry,

[0088] It will be appreciated that the present invention is not limited to the embodiments shown. Several modifications and variations are thus conceivable within the scope of the invention which thus is exclusively defined by the appended claims.

Claims

CLAIMS1. System (1000) for transferring a tail (101 ) of a cellulose fibrous based web from a first unit (100) to a second unit (200), the tail (101 ) being formed by forwarding the web from the first unit (100) and slitting the web to form a tail (101 ), wherein said system (1000) comprises a tail forwarding device configured to move the tail to a tail conveyor device (110), said tail conveyor device being adapted to forward the tail to the second unit, and wherein said tail conveyor device comprises a tail guide device (120) comprising a tail guide element (124) movable between a guiding position and a non-guiding position.

2. The system of claim 1 , wherein said tail guide element (124) is configured to, in said guiding position, maintain the tail (101 ) in a predetermined lateral position in the tail conveyor device (110) during tail transferring.

3. The system of claim 1 or 2, wherein said tail guide element (124) is pivotable between said guiding position and said non-guiding position.

4. The system of any one of the preceding claims, wherein said tail guide element (124) is a plate.

5. The system of claim 4, wherein said plate has a convex surface towards the tail conveyor device (110).

6. The system of any one of the preceding claims, wherein said tail guide device (120) comprises an actuator arranged to move the tail guide element (124) between said guiding position and said non-guiding position.

7. The system of any one of the preceding claims configured to transfer a tail (101 ) that has dryness in the range of 45 to 93% BD Bone Dry.

8. The system of any one of the preceding claims, wherein said first unit (100) is a cellulose pulp dryer (104) and preferably a cellulose pulp dryer operating in accordance with the air borne principle.

9. The system of any one of the preceding claims configured to transfer a tail (101 ) that is adapted to stand a tensile force of 50 to 2600 N.

10. The system of any one of the preceding claims, wherein the second unit (200) is a reeler unit (204).

11. A method of transferring a tail of a web of a cellulose based fibrous web from a first unit (100) to a second unit (200), said method comprising: forwarding the tail from the first unit (100) and slitting the web along its longitudinal direction to form a tail (101), moving the tail to a tail conveyor device (110, and guiding, by means of a tail guide device comprising a movable tail guide element (124), the tail (101) in a predetermined path from the tail conveyor device (110) towards the second unit (200).

12. The method of claim 11 , comprising: moving the tail to a cutting position, cutting the tail (101 ) along its transverse direction, and catching the tail (101 ) by means of the tail conveyor device (110).

13. The method of claim 11 or 12, comprising: maintaining, when the movable tail guide element (124) is situated in a guiding position, the tail (101 ) in a predetermined lateral position in the tail conveyor device (110) during tail transferring.

14. The method of any or of claims 11-13, wherein the second unit is a cutter unit (202) or a reeler unit (204).

15. A tail guide device (120) for controlling a tail (101 ) made from a cellulose based web in a conveyor device (110), said tail guide device (120) comprising a tail guide element (124) movable between a guiding position and a nonguiding position to control said tail (101 ) in said guiding position.