Method for group change in a slitter-winder and slitter-winder comprising a group change system

Abstract

A group change method in a slitter winder and a slitter winder comprising a group change system. A group change is performed in a winder (10) of a slitter winder by a group change system (40), the winder comprising two winding drums (11, 12), at least one of which is movable to adjust the distance between the winding drums; a press roll unit (20), in which a customer roll (15) is wound on a support of a winding drum of a portion of web of a fiber web that has been slit. The group change system comprises an adhesive application device (23), a cutting device (22), a roll pusher (21) and a core placer (24), the method being performed to remove a finished customer roll and to provide a new core. The adhesive application device applies adhesive to the portion of web, which is cut by the cutting device, the finished customer roll is removed by the roll pusher, and a new core is provided to the winding drum to start winding a next group of customer rolls. When the finished customer roll is removed, the winding drum is moved back towards the position from which the winding of the customer roll started.

Description

Technical Field

[0001] This invention generally relates to the production of fiber webs and, particularly, the production of customer rolls of fiber webs in slitting and rewinding machines. The invention relates to a group changing method in a slitting and rewinding machine. The invention also relates to a slitting and rewinding machine comprising a group changing system for the slitting and rewinding machine. Background Technology

[0002] As is well known, fiber webs (e.g., paper and paperboard webs) are manufactured in devices and machines that together constitute a fiber web production line that can be hundreds of meters long. As known from the prior art, a fiber web production line typically comprises a set of components formed by multiple devices and machines arranged sequentially within the production line. A typical fiber web production line includes a forming section, a press section, a drying section, and a winding machine; the forming section includes a headbox and a wire section. The production line may also include other sections and devices for processing and / or finishing the fiber webs, such as sizing machines, coating devices, and calenders. Production and processing lines typically also include at least one slitting and rewinding machine for forming customer rolls, as well as roll sealing devices. Currently, fiber web production lines (especially those for certain fiber web-grade products, such as those for corrugated web-grade and lining web-grade products) travel at very high speeds, requiring two slitting and rewinding machines to slit and rewind the fiber webs produced in the fiber web production line.

[0003] In a fiber web production line, the manufacturing of fiber webs is a continuous process. Fiber webs completed in the fiber web production line are wound around a winding shaft (i.e., a reel) by a paper reel to form master rolls with diameters exceeding 5 meters and weights exceeding 160 tons. The purpose of winding is to transform the fiber webs, manufactured in a planar and continuous manner, into a form that is easier to handle. At the paper reel located in the main fiber web production line, the continuous process of the fiber web machine is interrupted for the first time and transformed into a periodic operation. Therefore, the paper reel is used in fiber web production to wind fiber webs from the fiber web production line into master rolls; however, the paper reel is also used to wind fiber webs from coating machines, calenders, or corresponding finishing devices.

[0004] In a paper reel, the fiber web wound onto the master roll is full width, and therefore must be cut longitudinally into partial webs of suitable width. These partial webs are then wound into partial fiber web rolls (customer rolls) with suitable fiber web lengths and / or suitable diameters for the customer. As known in the art, slitting and winding are performed in a suitable separate machine, i.e., in a slitting and rewinding machine. A slitting and rewinding machine includes: an unwinder in which the master roll is unwound; a slitting section in which the fiber web unwound from the master roll is slit (i.e., cut longitudinally) into partial webs of desired widths; and a rewinding section for rewinding the customer rolls. Different types of rewinding devices are employed in the rewinding section of the slitting and rewinding machine, such as multistation rewinders and two-drum rewinders. As is known in the prior art, when winding fiber webs into customer rolls on a slitting and rewinding machine, rewinding can be performed using either a coreless shaft or a shaft with a core. In a multi-station rewinding machine type slitting and rewinding machine, the fiber web is guided from the unwinding point via guide rollers to a slitting section, where the fiber web is slit into partial webs. These partial webs are further guided from above or below to one or more rewinding rollers at a rewinding station to be rewound onto a core to form a customer roll. Adjacent partial webs are rewound onto different sides of the rewinding rollers / rewound onto different rewinding rollers. A multi-station rewinding machine has one to three rewinding rollers, and each partial web is rewound into a partial web roll in its own rewinding station on these rewinding rollers. During rewinding, a rewinding pressure zone is formed between the rewinding rollers and the partial web roll to be rewound. In a twin-roll rewinder, a portion of the web material is rewound into a customer roll via a pressure zone between the rewinding roll and the customer roll being formed, around a rewinding core supported by two rewinding rolls. In a twin-roll rewinder, a belt assembly (i.e., a so-called set of belt rollers) can also be used as the rewinding roll, the belt assembly having one or more belt loops positioned around two guide rollers. During rewinding, a rewinding pressure zone is formed between the rewinding roll and the customer roll being rewound. In a twin-roll slitting rewinder, a pressure roller unit located above the customer roll is also typically used for loading and / or supporting the customer roll during rewinding. It is known from the prior art that one or both of the rewinding rolls are movable in the longitudinal direction (i.e., in the main process direction of the slitting rewinder), thus the distance between the rewinding rolls is adjustable.

[0005] As is known from the prior art, in a slitting and rewinding machine, the master roll is unwound in the unwinding section of at least one unwinding machine, and the full-width fiber web is slit into several narrower partial fiber webs (partial webs) on the slitting section. These partial fiber webs are then rewound around a rewinding core on the rewinding section to form a customer roll. In the slitting and rewinding machine, when the customer roll reaches the desired length and diameter, a group change is performed, and the partial webs are cut in the cross-direction. During the group change, the tail of the partial web (i.e., the tail end of the cut partial web) is attached to the surface of the fiber web on the surface of the customer roll by applying an adhesive to the surface of the fiber web traveling toward the customer roll. When the customer roll is complete, in the slitting and rewinding machine, during the group change, the complete customer roll (i.e., the so-called group) is removed from the rewinding machine, and a new core for rewinding the next group of customer rolls is set into the rewinding machine, after which the process of rewinding the next group of customer rolls continues. These stages are repeated periodically until the paper in the unwinder's master roll is used up, thus performing a master roll change, and the operation begins again with the unwinding of the next master roll.

[0006] In this specification and claims, when referring to the support rolls / roll groups of a rewinder of the twin-roll rewinder type, the term "rewinding roll" is used for simplicity, meaning it includes both "rewinding roll" and "a set of rolls". Furthermore, in this specification, the term "core" also refers to a rewinding tube used in twin-roll rewinders and other types suitable for twin-roll rewinders. Additionally, in this specification, depending on the context, whether the portion of web wound on the rewinder and the resulting web roll are mentioned in the singular or plural, they refer to all portions of web and web rolls processed in the rewinder.

[0007] As a key step, group replacement includes: cutting a portion of the web; attaching the tail end of the portion of the web to the surface of a customer roll by applying adhesive to the surface of the portion of the web; removing the completed customer roll from the rewinder; and setting a new core for the next set of customer rolls onto a support of the rewinding roller and attaching the starting end of the portion of the web to the core by adhesive. For group replacement, a slitting rewinder typically includes: a device for applying adhesive (i.e., an adhesive application device) for attaching the tail end of the portion of the web to the surface of the customer roll; a cutting device for cutting the portion of the web; a roll pusher for removing the completed customer roll; a core placer for setting the core for rewinding the next set of customer rolls; and another device for applying adhesive (i.e., a core adhesive application device) for attaching the starting end of the portion of the web to the core. It is known from the prior art that adhesive can be applied, for example, by an adhesive application device that moves laterally, which has proven to operate well to produce an adhesive strip that extends substantially laterally on the surface of the fiber web. It is also known from the prior art that a portion of the web is cut from below using, for example, a cutting blade as a cutting device, by means of a cutting motion extending between rewinding cylinders. Furthermore, it is also known from the prior art that a new core is set into the rewinder by a core setting device positioned below or above the rewinding cylinders.

[0008] In known methods of group changing using known group changing devices, the slitting and rewinding machine travels at a low speed (crawling speed) for at least part of the group changing period and is also stopped for at least part of the group changing period. Typically, the group changing time is 15-60 seconds. This time is due to the reasons mentioned above and the continuous movement of the devices used for the different steps of the group changing. Although it only involves a few seconds, it should be noted that dozens or even hundreds of group changing operations are typically performed daily. Therefore, when the goal is to perform customer roll production as quickly as possible after the fiber web production line, and even using only a single slitting and rewinding machine, this is significant in terms of time and capacity savings in routinely necessary operations. Furthermore, it is important that the slitting and rewinding process is not a limiting factor for the total capacity of the fiber web production line.

[0009] US5577684A discloses a rewinding machine for rewinding material webs, which includes two driven support cylinders forming a rewinding bed between the two support cylinders, and means for lifting a fully rewound roll from one of the support cylinders to eject the fully rewound roll from the rewinding bed.

[0010] Patent application publication EP 0118384A1 discloses a paper rewinder comprising: a parallel first rewinding cylinder and a second rewinding cylinder, with a rewinding assembly defined between the first and second rewinding cylinders for supporting a roll rewound on a core, the web being supplied onto the roll via the first cylinder; a blade that substantially extends the length of the first cylinder and has a conforming curvature substantially concentric with the first cylinder, and is movable in a path toward an operating position to engage the web in the assembly for cutting the web as the rewound completed roll is removed from the rewinding assembly; a core conveyor that is movable from a retracted position away from the assembly to an operating position above the assembly for placing a new core to be rewound; and a roll ejector that is movable to engage with the rewound completed roll to force the roll away from the assembly, preparing for the placement of a new core into the rewinding position. One drawback of this arrangement is that the tail end of a portion of the web cannot be attached to the surface of the customer roll using hot melt adhesive because the cutting device is located below the pressure zone, so the adhesive cannot attach quickly enough for the hot melt adhesive to work.

[0011] German utility model publication DE 29719544U1 discloses an apparatus for cutting webs, wherein the web of a roll formed on a support roller is cut before a new rewinding begins, and the completed roll can be moved from the first support roller along the direction of the second support roller by a discharge device.

[0012] In known slitting and rewinding machines that include a group replacement system (such as the slitting and rewinding machine disclosed in the aforementioned publications), the time required for group replacement is approximately one minute. Summary of the Invention

[0013] One object of the present invention is to provide a method for group replacement in a slitting rewinder, particularly suitable for twin-roll rewinders, wherein the disadvantages of the prior art are eliminated or at least minimized.

[0014] Another object of the present invention is to provide a slitting and rewinding machine, particularly a twin-drum slitting and rewinding machine, including a system for group replacement, wherein the disadvantages of the prior art are eliminated or at least minimized.

[0015] To achieve the above-mentioned objectives and those that subsequently arise, the main features of the method according to the invention and the slitting and rewinding machine according to the invention are described below.

[0016] According to the present invention, in a method for group replacement in a slitting rewinder, group replacement is performed in the rewinder of the slitting rewinder by a group replacement system. The rewinder is a twin-roll rewinder and includes: two rewinding rolls, at least one of which is movable to adjust the distance between the rewinding rolls; and a pressure roll unit, wherein a customer roll is rewound in the rewinder on a support portion of a portion of the slitting fiber web on the rewinding roll. The group replacement system includes an adhesive application device for attaching the tail end of the portion of the web to the surface of the customer roll, a cutting device, a roll pusher, and a core placer. The method is performed to remove a completed set of customer rolls from the rewinder and provide a new core for rewinding the next set of customer rolls. In this method, the adhesive application device applies adhesive to the portion of the web traveling toward the customer roll. On the web, and when the adhesive has reached the surface of the customer roll, a portion of the web is cut by a cutting device. The completed customer roll is removed by the roll pusher, and a new core is placed on the support of the rewinding cylinder by a core placer to begin rewinding the next set of customer rolls. When the completed customer rolls have been removed, the rewinding cylinders move back towards their starting rewinding positions, and when the roll pusher reaches the turning point between its push motion and its return motion to its resting position, a new core is simultaneously placed from above on the support of the rewinding cylinder by the core placer. In this method, the downward movement of the pressure roller unit towards its position at the start of rewinding the next set of customer rolls occurs simultaneously with the roll pusher returning to its resting position. The roll pusher does not need to wait for the core placer to move to set the core, nor for the core placer to return to its resting position, as in prior art methods. The roll pusher is at the turning point between its push motion and return motion in only 0-3 seconds, advantageously less than 1 second. This simultaneity of movement saves time required for set changes. Preferably, at the start of rewinding, the distance between the positions of the rewinding rollers is 2 mm to 18 mm, more preferably 5 mm to 12 mm. This allows for an increase in the diameter of the rewinding rollers even when using a small-diameter core. This is particularly advantageous when processing wider fiber webs using a slitting rewinder. Synchronous movement further reduces the time required for group changes.

[0017] According to an advantageous feature of the invention, in this method, before the roll pusher begins its movement back to its resting position, the pressure roller unit moves downwards by at least one-third of the distance toward its position where rewinding of the next set of customer rolls begins. Therefore, at least one-third of the time required for the pressure roller unit movement is saved compared to prior art methods. Advantageously, when the roll pusher is in its transition position, the pressure roller unit has already moved downwards by approximately one-third of the entire distance toward its position where rewinding begins, which is the distance between the highest and lowest positions of the pressure roller unit, where there is space for the customer roll to be removed, and where the pressure roller of the pressure roller unit is in contact with the core supported on the rewinding cylinder. Advantageously, when the roll pusher has moved to its resting position, the pressure roller unit is very close to the position where rewinding begins (advantageously within a distance of approximately 30 cm).

[0018] According to an advantageous feature of the invention, the core placer positions a new core from above, supported by a rewinding roller, through a substantially vertical movement of the core placer. This movement can deviate from the vertical direction within + / - 10 degrees.

[0019] According to an advantageous feature of the invention, in this method, at least one rewinding roller is moved to provide space for the movement of a cutting device, which cuts portions of the web by a cutting motion passing underneath the pressure zone between the rewinding roller and the customer roll. This provides a robust cutting device configuration, accurate cutting positioning, and rapid cutting of portions of the web. This further provides that the adhesive-coated tail end of the fiber web can be firmly pressed against the surface of the finished customer roll by a roll pusher.

[0020] According to an advantageous feature of the invention, in this method, at least one rewinding roller is moved to provide space for an adhesive application device to move upward from its resting position below the rewinding roller to an adhesive application position adjacent to the rewinding roller on which a portion of the web travels toward the customer roll. This provides a robust configuration of the adhesive application device and rapid and safe application of the adhesive.

[0021] According to an advantageous feature of the invention, in this method, the movement of the core placer and the movement of the winding pusher are mechanically synchronized via a linkage mechanism. This provides a stable configuration and safe movement for the core placer and the winding pusher. Advantageously, since the core placer is arranged to rotate relative to the support structure of the winding pusher, the linkage mechanism for the core placer moves the core placer to the core setting position by means of the movement of the winding pusher. Therefore, simultaneously, when the winding pusher reaches its switching position, it also reaches the core setting position, and the core placer is ready to set the core onto the support of the rewinding roller.

[0022] According to an advantageous feature of the invention, in this method, for the movement of the pressure roller unit, the support elements pivotally journal-connected to the support beams of the core placer and the winding pusher are aligned in the vertical direction. This provides time savings for set replacement and safe movement of the pressure roller unit. Therefore, advantageously, the support elements will not collide with or obstruct the movement of the pressure roller unit. The side of the support element facing the pressure roller unit is substantially vertical, so that when the winding pusher is in its switching position, the side of the support element facing the pressure roller unit is in a substantially vertical direction.

[0023] According to the present invention, a slitting and rewinding machine includes a group changing system and a rewinder. The group changing system is configured to perform group changing, and the rewinder is configured to rewind portions of the slitting fiber web into customer rolls. The rewinder is a twin-roll rewinder and includes two rewinding rollers and a pressure roller unit, wherein at least one rewinding roller is movable to adjust the distance between the rewinding rollers. The pressure roller unit is movable in the vertical direction and configured to support the core and the customer roll. The group changing system includes an adhesive application device configured to apply adhesive to portions of the web. The rewinding machine includes a web section on its surface to attach the tail end of a portion of the web to the surface of a customer roll; a cutting device configured to cut the portion of the web; a roll pusher configured to remove a set of completed customer rolls from the rewinder; and a core placer configured to place new cores on the support of the rewinding cylinder for rewinding the next set of customer rolls. The core placer is located above the rewinding cylinder and mechanically connected to the roll pusher. As the roll pusher moves back to its resting position, the pressure roller unit is configured to move downwards toward its position to begin rewinding the next set of customer rolls. This provides a robust and safe-operating roll changeover system and saves roll changeover time.

[0024] According to an advantageous feature of the invention, the cutting device is configured to move from below and through the pressure zone between the rewinding cylinder and the customer roll during its cutting motion. This provides a robust cutting device configuration, accurate cutting positioning, and rapid cutting of portions of the web. This further provides that the adhesive-coated tail end of the fiber web can be firmly pressed against the surface of the finished customer roll by the roll pusher.

[0025] According to an advantageous feature of the invention, the adhesive application device is positioned in its adhesive application position between the rewinding rollers and adjacent to the rewinding roller on which a portion of the web is configured to travel toward the customer roll. This provides a robust adhesive application device configuration as well as rapid and safe application of the adhesive.

[0026] According to an advantageous feature of the invention, the assembly replacement system includes a support element, a support arm, and a support beam, and the support element and support arm are pivotally connected to the support portion to move the winding actuator. This provides a stable configuration and safe movement of the winding actuator.

[0027] According to an advantageous feature of the invention, the core placer is connected to the support element of the winding actuator via a linkage mechanism. This provides a stable configuration and safe movement for both the core placer and the winding actuator.

[0028] According to one aspect of the invention, the rewinding unit changeover system of a slitting rewinder includes two rewinding rollers, a roll pusher, and a core placer located above the rewinding rollers. The rewinding rollers are movable such that the distance (space) between the two rewinding rollers is adjustable. After a customer roll is removed, the core placer is configured to place a new core substantially simultaneously with the stopping of the roll pusher for rewinding the next set of customer rolls. Advantageously, the changeover system includes a cutting device for cutting a portion of the web, and this cutting device is a blade configured to make a cutting motion through a pressure zone between the rewinding rollers and the customer roll. Advantageously, the changeover system includes an adhesive application device for attaching the tail end of the portion of the web to the surface of a customer roll configured to move vertically upward between the rewinding rollers to an adhesive application position. Advantageously, the cutting has already been performed when the rewinder stops and the roll pusher begins its movement, such that when the cutting is performed, the adhesive is already on the surface of the portion of the web and attached to the surface of the customer roll, thereby completing all the operations required to finish the customer roll. Advantageously, a hot-melt adhesive that requires rapid attachment is used, which is provided by an adhesive application device moving from below and through the pressure zone. Therefore, no separate operation is required to attach the tail end.

[0029] Advantageously, the group change system also includes another adhesive application device (i.e., a core adhesive application device) for attaching the starting end of a portion of the web to the core. Adhesive is applied to the core by this core adhesive application device before the core is moved onto the support of the rewinding cylinder to begin rewinding a new set of customer rolls. Advantageously, the group change system includes a slotting element for core transport, from which a core placer picks up the core for transport to the support of the rewinding cylinder. Advantageously, the core is supplied to the slotting element from the side. Advantageously, the core is provided with adhesive for attaching the starting end of a portion of the web as the core is supplied to the slotting element, which saves time during group change. Advantageously, the adhesive is applied to the core in the form of an adhesive strip, such that the adhesive strip on the core is optimally positioned to attach the starting end of a portion of the web. Typically, the adhesive strip is positioned below or within the pressure zone between the corresponding rewinding roller and the core. Thus, the starting end of the portion of the web, after being cut, travels a short distance clockwise as the rewinding roller moves, and the starting end approaches the pressure zone a short distance upward and adheres to the core, thus initiating rewinding.

[0030] According to an advantageous aspect of the invention, in the group changing system, the roll pusher is pivotally connected above the rewinding roller, the core is positioned from above by the core placer, the cutting device provides cutting around the rewinding roller from below, and at least one rewinding roller is movable.

[0031] It is noteworthy that by preparing the next step of the group replacement before the previous step of the group replacement is completed, the waiting time between the steps of the group replacement is eliminated, and thus significant time savings in terms of group replacement time are achieved.

[0032] Several advantages are achieved through this invention and its advantageous features: the time required for roll change is significantly reduced, to less than 10 seconds. Because the core placement by the core placer is mechanically synchronized, the roll change system is robust, more cost-effective, and easier to start. Since the core placer is located above the rewinding cylinder, space is provided below the rewinding cylinder for the adhesive application device to attach the tail end of a portion of the web to the surface of the customer roll. Attached Figure Description

[0033] However, various aspects of the invention and its additional objects and advantages will be best understood when read in conjunction with the accompanying drawings, based on the following description of some exemplary embodiments, and the invention will be described in more detail below with reference to the accompanying drawings, wherein...

[0034] Figures 1-7 The diagram schematically illustrates an advantageous example of the steps of the group replacement method according to the invention in an advantageous example of a slitting and rewinding machine using a group replacement system according to the invention. Detailed Implementation

[0035] In the following description, unless otherwise stated, the same reference numerals denote similar parts, and it should be understood that modifications may be made to these examples to suit different uses and conditions within the framework of the invention. For clarity, some repeated reference numerals may have been omitted in some of the drawings. In some drawings, arrows have been used to indicate the direction of rotation of the corresponding main elements of the described structure.

[0036] Figures 1-7An exemplary embodiment of the invention is illustrated in the rewinder 10 of a twin-roll slitting and rewinding machine. A fiber web is guided, for example, from an unwinder (not shown) to a slitting section (not shown), where the fiber web is slit longitudinally into narrower fiber webs for customer rolls 15. The fiber web W is then guided to the rewinder 10 after the slitting section, reaching the surface of a first rewinding roller 11, and passing along the surface of the rewinding roller 11 through a rewinding pressure zone formed between the rewinding roller 11 and the customer roll 15 to rewind onto the customer roll 15. The customer roll 15 is formed around a core 14. The rewinder 10 also includes a second rewinding roller 12, and during rewinding, the customer roll 15 is supported on both rewinding rollers 11 and 12. Depending on the type of twin-roll rewinder, one or both of the rewinding rollers 11 and 12 may also be formed as a set of belt rollers, in which an annular belt loop is arranged around the two rollers. The rewinder 10 includes a group changing system 40, which includes means for performing a group changing method in the rewinder 10.

[0037] In the rewinder 10, at least one of the rewinding rollers 11 and 12 is movable, such that the distance between the rewinding rollers 11 and 12 is adjustable. When rewinding is started, the rewinding rollers 11 and 12 are in the position for starting rewinding, and the distance gradually increases as rewinding proceeds.

[0038] The rewinder 10 also includes a pressure roller unit 20, which comprises a pressure roller 25 composed of segmented rollers and a pressure roller beam 35 for support. The pressure roller unit 20, including the pressure roller 25 and the pressure roller beam 35, is arranged to be vertically movable to support the core 14 and the customer roll 15 and / or load the core 14 and the customer roll 15 during rewinding of the customer roll 15. When the core 14 is positioned to be supported by the rewinding rollers 11, 12 to initiate rewinding, the pressure roller unit 20 is at its lowest position in the vertical direction and moves upward as rewinding proceeds and the diameter of the customer roll 15 increases during rewinding.

[0039] For group replacement, the group replacement system 40 of the rewinder 10 of the slitting rewinder includes: an adhesive application device 23 for attaching the tail end of a portion of the web to the surface of a customer roll; a cutting device 22 for cutting the portion of the web; a roll pusher 21 for removing the completed customer roll 15; and a core placer 24 for placing the core 14 onto the rewinder 10. The group replacement system 40 also advantageously includes another device for applying adhesive (i.e., a core adhesive application device) for attaching the starting end of a portion of the web to the core 14. Adhesive is applied to the core 14 via the core adhesive application device before the core 14 moves onto the supports of the rewinding rollers 11, 12 to begin rewinding a new set of customer rolls.

[0040] The cutting device 22 is configured to cut a portion of the web from below by extending a cutting motion through the pressure zone between the rewinding roller 11 and the customer roll 15. Figures 1-7 In the example, the cutting device 22 is movably attached to the first rewinding roller 11. The cutting device 22 has, for example, Figure 1 , Figures 4-7 The resting positions shown and as Figures 2-3 The cutting motion shown terminates at, as indicated. Figure 2 The diagram shows the transition position of the cutting motion. At the transition position, a portion of the web is cut, and then the cutting device 22 returns to the resting position. The cutting device 22 is configured to move a certain distance from the surface of the first rewinding cylinder 11 along a circumferential motion path following the cylindrical surface of the first rewinding cylinder 11. The cutting device 22 is rotatably mounted on the central axis of the first rewinding cylinder 11.

[0041] The adhesive application device 23, which attaches the tail end of a portion of the web to the surface of the customer roll, is a laterally movable adhesive application device 23 that provides an adhesive strip that extends substantially laterally on the surface of the fiber web of the portion of the web. The adhesive application device 23 has Figures 3-7 The resting position shown and Figures 1-2 The adhesive application position is shown. To apply the adhesive, the adhesive application device 23 moves into the space created between the rewinding rollers 11 and 12 by moving at least one of them. In the adhesive application position, the adhesive application component of the adhesive application device 23 moves in a lateral / transverse direction, and the adhesive is applied to the surface of the fiber web that is passing through a portion of the web. After applying the adhesive, the adhesive application device 23 returns to the resting position. The adhesive application device 23 can also be arranged as a stationary device, i.e., having only one position, for example, connected to the unwinding device of a slitting rewinder.

[0042] A roll pusher 21 for removing a completed customer roll 15 from the rewinder 10 is attached to a pivotally pivotable support and pivot element 33, which is also pivotally attached to a support and pivot arm 34, which is pivotally attached to a support beam 45 of the rewinder 10. The roll pusher 21 has the following characteristics: Figure 7 The resting positions shown and as Figures 2-4The push motion during set change is shown. The push motion is provided by pivot element 33 and pivot arm 34 and is configured to push the completed customer roll 15 away from rewinder 10 along the upper surface of the second rewinding roller 12. After the completed customer roll 15 has been removed from rewinder 10, roll pusher 21 is configured to begin its return movement to a resting position. In set change system 40, core placer 14 is attached to pivot arm 34 via a linkage mechanism. Therefore, the position and movement of roll pusher 21 and core placer 14 are synchronized, such that during the push motion of roll pusher 21 and the return motion of roll pusher 21, core placer 14 is configured to perform a movement for placing new cores 14 on the supports of rewinding rollers 11, 12 for rewinding the next set of customer rolls 15. Figure 1 As shown, at the start of a group change, the core placer 14 has already retrieved a new core 14 from the core reservoir (not shown). Advantageously, the core reservoir is a slot element or channel positioned adjacent to the group change system 40 and the core placer 14, in which multiple cores are placed longitudinally consecutively, such that the core placer 14 simultaneously retrieves multiple cores from the slot element for the next group. The core placer 14 is a double suction cup array. The suction cups hold the core 14 in the slot element and move the core 14 safely and reliably to the support of the rewinding cylinders 11, 12. The support beam 45 and the pivot element 34 are pivotally connected to be vertically aligned during the start of the movement back to the resting position, thereby providing space for the downward synchronous movement of the pressure roller unit 20.

[0043] In such Figure 1 In the steps shown, at the start of the group change, the customer roll 15 is rotatably supported by the rewinding rollers 11 and 12. The customer roll 15 has reached the desired diameter and is complete. At this stage, a new core 14 for the next group of customer rolls has been removed by the placer 24 (located in the waiting position). Before the core 14 is moved onto the support of the rewinding rollers 11 and 12 to begin rewinding a new group of customer rolls, adhesive is applied to the core 14 by the core adhesive application device. The adhesive application device 23 for attaching the tail end to the customer roll has moved from its rest position to the adhesive application position and applies adhesive. The pressure roller unit 20 has moved upward to a position where it is not in contact with the customer roll 15. The cutting device 22 is in its rest position. At this time, the roll pusher 21 begins to move toward the completed customer roll 15. The rewinding rollers 11 and 12 are positioned separately to provide space for the adhesive application device 23.

[0044] exist Figure 2In the steps shown, adhesive has been applied by adhesive application device 23 to attach the tail end to the customer roll and is ready to move back from the adhesive application position to the resting position. When cutting device 22 has performed its cutting motion and cut a portion of the web, the adhesive strip on the fiber web surface of the portion of the web has reached the surface of the customer roll 15 and attached the tail end of the portion of the web. Cutting device 22 is in its switching position, ready to return to the resting position. Roll pusher 21 has moved to contact the customer roll 15. Pressure roller unit 20 remains in its upward position, not in contact with the customer roll. Rewinding rollers 11 and 12 are positioned separately to provide space for adhesive application device 23 and cutting device 22.

[0045] exist Figure 3 In the steps shown, the adhesive application device 23 for attaching the tail end to the customer roll has returned to its resting position, and the cutting device 22 is in its return motion to its resting position. The roll pusher 21 pushes the customer roll 15 over the second rewinding roller 12 in its pushing motion, and the core placer 24 with a new core 14, which is coated with adhesive by the core adhesive application device, follows the roll pusher 21 to attach the starting end of a portion of the web to the core 14. Through the movement of the linkage mechanism and in coordination with the movement of the pivot arm 34, the core placer 24 is moved to a position above the gap between the rewinding rollers 11 and 12 in the vertical direction, and has moved toward a core delivery position immediately adjacent to the gap between the rewinding rollers 11 and 12. When the roll pusher 21 reaches the transition point between its pushing and returning motions, the core placer 24 is ready at its delivery point to deliver the new core 14 onto the support portion of the rewinding rollers 11 and 12. Unlike prior art methods, the roll pusher 21 does not require the time needed for the core placer 24 to move to place the core, nor the time required for the core placer 24 to return to its resting position. The roll pusher 21 is in the transition point between its pushing and returning movements for only 0-3 seconds, advantageously less than 1 second. The pivot element 33 has already rotated relative to the pivot arm 34, thereby providing support and pushing contact between the roll pusher 21 and the customer roll 15 to be removed. The pressure roller unit 20 remains in its upward position, not in contact with the customer roll. The rewinding rollers 11, 12 are positioned separately from each other to provide space for the cutting device 22, but the distance between the rewinding rollers 11, 12 is reduced by moving at least one of them to position the rewinding rollers 11, 12 for receiving new cores 14.

[0046] exist Figure 4In the steps shown, the adhesive application device 23 and the cutting device 22 for attaching the tail end to the customer roll are in the resting position. The customer roll 15 has been removed from the rewinder 10, and the roll pusher 21 has disengaged from the customer roll 15. By the movement of the linkage mechanism and in coordination with the movement of the pivot arm 34, the core placer 24 is moved to a position above the gap between the rewinding rollers 11 and 12 in the vertical direction. The core placer 24 is positioned substantially vertically above the conveying point so as to convey a new core 14 at a core conveying position immediately adjacent to the gap between the rewinding rollers 11 and 12. The pressure roller unit 20, including the pressure roller 25 and the pressure roller beam 35, moves downward toward its position at the start of rewinding. At the start of rewinding, the rewinding rollers 11 and 12 are spaced approximately 3 mm to 25 mm apart, and are ready to receive a new core 14.

[0047] exist Figure 5 In the steps shown, the adhesive application device 23 and the cutting device 22 for attaching the tail end to the customer roll are in the rest position. The customer roll 15 has been removed from the rewinder 10, and the roll pusher 21 has disengaged from the customer roll 15. Through the movement of the linkage mechanism and in coordination with the movement of the pivot arm 34, the core placer 24 is moved to a position above the gap between the rewinding rollers 11 and 12 in the vertical direction. The core placer 24 delivers a new core and then moves from the core delivery point immediately adjacent to the gap between the rewinding rollers 11 and 12. The pressure roller unit 20 moves downward toward its position where rewinding begins. The rewinding rollers 11 and 12 are positioned at the start of rewinding and ready to support the new core 14.

[0048] exist Figure 6 In the steps shown, the adhesive application device 23 and the cutting device 22 for attaching the tail end to the customer roll are in the rest position. The customer roll 15 has been removed from the rewinder 10, and the roll pusher 21 has disengaged from the customer roll 15. Through the movement of the linkage mechanism and in coordination with the movement of the pivot arm 34, the core placer 24 has conveyed the core 14 and is moved back to its rest position. The pressure roller unit 20 moves downward toward its position where rewinding begins. The rewinding rollers 11 and 12 are positioned to begin rewinding and support the new core 14.

[0049] exist Figure 7 In the steps shown, the adhesive application device 23 and the cutting device 22 for attaching the tail end to the customer roll are in the rest position. The customer roll 15 has been removed from the rewinder 10. The roll pusher 21 and the core placer 24 have been moved back to their rest positions. The pressure roller unit 20 has been moved downward to support the new core 14 and to support the customer roll 15 to be rewound, as well as the loading of the customer roll 15 to be rewound. The rewinding rollers 11 and 12 are in the position where rewinding begins and supports the new core 14. The rewinder 10 is ready to begin rewinding the next set of customer rolls 15.

[0050] As can be seen from the accompanying drawings and noted above, in the group replacement method and system, at least one of the rewinding rollers 11 and 12 is movable, making the distance (space) between them adjustable, thereby providing space for the movement of the cutting device 22 and the adhesive application device 23 for attaching the tail end to the customer roll. In this method, when adhesive has been applied to a portion of the web by the adhesive application device 23 at the adhesive application position between the rewinding rollers 11 and 12, and the applied adhesive has reached the completed customer roll 15, the cutting device 22 cuts the portion of the web, and the customer roll 15 is ready to be removed from the rewinder by the roll pusher 21. When the roll pusher 21 has reached its transition point (where the completed customer roll 15 is removed), a new core 14 is placed by the core placer 24 onto the support portion of the rewinding rollers 11 and 12 from above by the vertical movement of the core placer 24. The roll pusher 21 and the movable rewinding cylinder and the pressure roller unit 20 move substantially synchronously. Thus, when the roll pusher 21 is at the end of its pushing motion for removing the completed customer roll 15, the rewinding cylinders 11 and 12 have been moved back to the starting position for rewinding, and the core placer 24 has lowered the new core 14 into the support of the rewinding cylinders 11 and 12.

[0051] In the foregoing description, although some functions have been described with reference to certain features, these functions may be performed by other features, whether or not they are described. Although some features have been described with reference to certain embodiments or examples, these features may also exist in other embodiments or examples, whether or not they are described. The invention has been described above only by reference to some advantageous examples, and the invention is not limited to these examples. Many modifications and variations can be made within the scope of the invention as defined in the appended claims.

Claims

1. A method for group replacement in a slitting rewinder, wherein group replacement is performed in a rewinder (10) of the slitting rewinder via a group replacement system (40), the rewinder (10) being a double-roller rewinder, and comprising: Two rewinding rollers (11, 12), at least one of which is movable to adjust the distance between the rewinding rollers (11, 12); and a pressure roller unit (20) in which a portion of the slit fiber web is rewound into a customer roll (15) on the support of the rewinding rollers (11, 12), the group replacement system (40) including an adhesive application device (23) for attaching the tail end of the portion of the web to the surface of the customer roll (15), a cutting device (22), a roll pusher (21), and a core placer (24), the method being performed to remove a completed customer roll (15) from the rewinding machine and provide a new core for rewinding the next customer roll (15), in which the adhesive application device (23) applies adhesive to the portion of the web traveling toward the customer roll (15), and when the adhesive has reached the customer roll (15) When the surface is exposed, the portion of the web is cut by the cutting device (22), a set of completed customer rolls (15) is removed by the roll pusher (21), and a new core is placed on the support of the rewinding rollers (11, 12) by the core placer (24) to begin rewinding the next set of customer rolls (15). In this method, when the set of completed customer rolls (15) has been removed, the rewinding rollers (11, 12) move back toward their starting rewinding position. At the same time, when the roll pusher (21) reaches the transition point between its pushing motion and its return motion to its resting position, the core placer (24) places a new core (14) on the support of the rewinding rollers (11, 12) from above. The method is characterized in that, in this method, while the roll pusher (21) moves back to its resting position, the pressure roller unit (20) moves downward toward its starting rewinding position for the next set of customer rolls (15).

2. The method according to claim 1, characterized in that, In the method, before the roll pusher (21) begins to move back to its resting position, the pressure roller unit (20) moves downward by at least one-third of a distance toward the position where it begins to rewind the next set of customer rolls (15).

3. The method according to claim 1 or 2, characterized in that, Through the essentially vertical movement of the core placer (24), the core placer (24) places the new core (14) from above onto the support of the rewinding rollers (11, 12).

4. The method according to any one of claims 1-3, characterized in that, In the method, at least one of the rewinding rollers (11, 12) is moved to provide space for the movement of the cutting device (21), thereby cutting the portion of the web by the cutting movement of the cutting device (21) passing under the pressure zone between the rewinding roller (11) and the customer roll (15).

5. The method according to any one of claims 1-4, characterized in that, In the method, at least one of the rewinding rollers (11, 12) is moved to provide space for the adhesive application device (23) to move upward from a resting position below the rewinding rollers (11, 12) to an adhesive application position adjacent to the rewinding roller (11), the portion of the web traveling toward the customer roll (15) on the surface of the rewinding roller (11).

6. The method according to any one of claims 1-5, characterized in that, In the method, the movement of the core placer (24) and the movement of the roll pusher (21) are mechanically synchronized by a linkage mechanism (31).

7. The method according to any one of claims 1-6, characterized in that, In the method, for the movement of the pressure roller unit (20), the support element (34) pivotally connected to the support beam (45) of the core placer (24) and the roll pusher (21) is aligned in the vertical direction.

8. The method according to any one of claims 1-7, characterized in that, In the method, when the roll pusher (21) is in its switching position, the side of the support element (34) facing the pressure roller unit (20) is in a substantially vertical direction.

9. A slitting and rewinding machine, comprising a group changing system (40) and a rewinding machine (10), the group changing system (40) being configured to perform group changing, the rewinding machine (10) being configured to rewind portions of slitting fiber webs into groups of customer rolls (15), the rewinding machine (10) being a twin-roll rewinding machine and comprising: Two rewinding rollers (11, 12), at least one of which is movable to adjust the distance between the rewinding rollers (11, 12); and a pressure roller unit (20) movable in the vertical direction and configured to support the core (14) and the customer roll (15). The group replacement system (40) includes: an adhesive application device (23) configured to apply adhesive to the surface of the portion of the web to attach the tail end of the portion of the web to the surface of the customer roll; a cutting device (22) configured to cut the portion of the web; and a roll pusher. 21), which is configured to remove a set of completed customer rolls (15) from the rewinder; and a core placer (24), which is configured to place a new core on the support of the rewinding rollers (11, 12) for rewinding the next set of customer rolls (15), wherein the core placer (24) is located above the rewinding rollers (11, 12) and is mechanically connected to the roll pusher (21), characterized in that, as the roll pusher (21) moves back to its resting position, the pressure roller unit (20) is configured to move downward toward the position where it begins rewinding the next set of customer rolls (15).

10. The slitting and rewinding machine according to claim 9, characterized in that, The cutting device (22) is configured to move from below through the pressure zone between the rewinding roller (11) and the customer roll (15) during its cutting motion.

11. The slitting and rewinding machine according to claim 9 or 10, characterized in that, The adhesive application device (23) is located at its adhesive application position between and adjacent to the rewinding rollers (11, 12), and the portion of the web is configured to travel toward the customer roll (15) on the surface of the rewinding roller (11).

12. The slitting and rewinding machine according to any one of claims 9-11, characterized in that, The group replacement system (40) includes a support element (34), a support arm (33), and a support beam (45), and the support element (34) and the support arm (33) are pivotally connected to the support and move the roll pusher (21).

13. The slitting and rewinding machine according to claim 12, characterized in that, The core placer (24) is connected to the support element (34) of the winding pusher (21) via a linkage mechanism (31).

14. The slitting and rewinding machine according to any one of claims 9-13, characterized in that, At the position where rewinding begins, the distance between the rewinding rollers (11, 12) is 2 mm to 18 mm, preferably 5 mm to 12 mm.

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