Multiply web rotary embossing sleeve replacement calendar

Abstract

The present invention relates to a sleeve-changing calender (1) for rotary embossing a multi-ply tissue web or for producing ply bonds between the individual plies of a multi-ply tissue web, the sleeve-changing calender (1) having a roll frame (7) on which at least one roll (12, 13) is mounted, the roll frame (7) being fitted with an expandable support core (3) and an exchangeable sleeve (4), the sleeve being pressable into the support core for assembly and being fixed to the support core by a friction fit, the support core being designed with a multi-chamber system (11) for individually applying pressure to separate pressure zones (10).

Description

Technical Field

[0001] The present invention relates to a sleeve-changing calendar for rotary embossing a multi-ply tissue web or for creating ply bonding between individual plies of a multi-ply tissue web, the sleeve-changing calendar having a roll frame to which at least one roll is attached, the roll frame having an expandable support core and an exchangeable sleeve attached thereto, the sleeve being pushable onto the support core for assembly and fixable to the support core by friction fit. Sleeve-changing calendars are known, for example, from EP 1 967 360 A2.

[0002] However, in the prior art, sleeve-changing calendars that can generate different pressures over the extension of an embossing nip are not known. However, this has the technical advantage that the pressure gradient within the embossing nip can be accurately adapted to the product or pattern to be embossed.

[0003] Therefore, an object of the present invention is to provide a sleeve-changing calendar that is more flexibly adjustable and produces better embossing results.

[0004] This object is achieved by an apparatus or method having the features of the independent claims.

[0005] Therefore, it is defined that the support core is designed with a multi-chamber system for applying pressure individually to separate pressure zones.

[0006] The local selectivity in setting different pressures in various pressure zones has the advantage of allowing higher pressure to be applied to areas where an embossed pattern is to be created, while, conversely, areas of the tissue to be embossed that are not to be embossed can be passed through the embossing nip at lower pressure. This advantage is particularly important when embossing paper handkerchiefs, where embossed and unembossed areas are created. Typically, multiple tissue webs are embossed adjacent to each other in the axial direction of the roll. It can be specified that each chamber in a multi-chamber system has at least one pressure zone. Multiple pressure chambers may be spaced apart from each other in the axial direction. It can also be specified that sleeve change calenders can be designed for embossing woven or nonwoven materials.

[0007] Within the scope of the present invention, the tissue web may be a non-woven fabric. In particular, the tissue web may include or be made of a tissue material containing paper. For example, the tissue web may be tissue paper such as paper towels made of cellulose sanitary paper. The tissue web can be used in the manufacture of toilet paper, kitchen paper, paper napkins, or paper handkerchiefs.

[0008] Each pressure zone can be specified to have at least one fluid channel. The support core can be specified to have multiple, for example, at least four different pressure zones. In particular, it can be specified that different embossing zones can be generated selectively and / or spatially separated by applying individual pressures to each pressure zone, or by applying different pressures to all pressure zones. The pressure zones can be divided along the axial direction of the roll. The widths of the pressure zones may vary. All pressure zones can be the same width. This allows the outer diameter of the sleeve to be changed by pressure, and this change can be set individually in different pressure zones by providing different fluid pressures.

[0009] Preferably, the sleeve exchange calender has a three-part structure with a central support core on which a first zone sleeve having pressure zones is pressed, i.e., contracted. An exchangeable sleeve having molded edges on its outer circumference is pressed against its outer circumference. The pressure zones can be formed as recesses on the inside of the zone sleeve facing the support core. At least one fluid channel may lead to each of the recesses, through which individual fluid pressures can be applied to the pressure zones.

[0010] Preferably, the pressure zones are positioned according to the embossing pattern of the sleeve to affect the embossed image of the sleeve. Alternatively or additionally, different pressure zones may be pressured so as to provide a uniform embossing pressure over the entire length of the calender or the entire width of the tissue web. In particular, different pressure zones along the length of the calender may be subjected to loads such that the calender bulges when unloaded, resulting in a diameter that increases towards the center compared to the area near the end bearings of the calender. The pressure in the pressure zones may be adjusted so that an essentially constant embossing pressure is provided over the entire length of the roll and therefore over the entire width of the embossing in applications where the calender is pressed against an opposing roll via opposing bearing points.

[0011] Therefore, it can be defined that the outer diameter of the sleeve can be partially pressure-controlled via hydraulics that can be adjusted separately in each pressure zone of the support core.

[0012] The support core, in particular the first support core element, can be defined as having at least one rotational feedthrough for transmitting hydraulic oil.

[0013] Each pressure zone, or hydraulic cylinder assigned to a pressure zone, can receive pressure through a separate medium channel connected to at least one rotary feedthrough.

[0014] Therefore, the support core or expander may be designed to include a multi-chamber system to accommodate different pressure loads and a rotary feedthrough for transmitting hydraulic oil through separate medium channels.

[0015] The media channel can be specified as being designed to accommodate a maximum operating pressure of 80–400 bar.

[0016] The support core may be configured to ensure that the mounted sleeve remains securely in place even in the event of an emergency stop and / or voltage loss and / or hydraulic shutdown / failure. For this purpose, the set hydraulic pressure can be clamped within the support core. For example, it may be specified that the hydraulic pressure is maintained via a built-in lockable check valve.

[0017] The support core may be specified as having an outer surface that is polished in a conical shape and / or coated with a highly wear-resistant material. The highly wear-resistant material may, for example, contain chromium or tungsten carbide, or be chromium or tungsten carbide. Thus, the conical polished surface facilitates the quick removal and installation of the sleeve, and enables the quick replacement of the sleeve. The chromium plating on the outer surface also ensures that the coefficient of friction between the inner circumference of the sleeve and the outer circumference of the support core is kept low, for example by combining steel and chromium, but other combinations of materials that have the same effect may also be considered.

[0018] The sleeve may be made of high-strength tool steel and / or may have a molded surface.

[0019] The support core can be defined as being supported at three points on the roll frame. This improves the rigidity of the shaft. The third bearing can be designed as a hydrodynamic plain bearing.

[0020] The support core bearing can be defined as having temperature control achieved by cooling the bearing cooling system, particularly all support core bearing points. The bearing cooling can be configured, for example, within the bearing cover. This means that the bearing cooling can be designed to be much larger than conventionally known solutions. This ensures smoother operation and, consequently, less vibration.

[0021] The drive bearing can be specified as being permanently installed within the roll frame or slide.

[0022] It can also be specified that the operating bearing, opposite to the driving bearing, is designed as a folding bearing, and / or that the rolling bearing on the operating side is openable and closable via a linear guide. By providing a folding bearing or linear guide, the bearing can be folded easily and quickly, especially when changing sleeves, thus allowing quick access to the sleeve to be replaced.

[0023] The drive-side bearings can be securely mounted to the machine frame or slide, while the operating-side bearings can be designed as folding bearings, allowing them to be pulled out and swung sideways when replacing the sleeves.

[0024] Sleeve-changing calendars can also be equipped with a replacement device for easily and directly replacing the support core or roll within the machine. The roll or support core of the sleeve-changing calendar can be replaced with minimal effort using an automatic tension adjustment system. When replacing the sleeve or roll, or the support core, the operating bearing can be easily opened and closed using linear guides or folding bearings.

[0025] In particular, a sleeve exchange calendar can be specified to have an upper roll and a lower roll, with an adjustable center offset of the upper roll relative to the lower roll. The advantage of this is that, because the center offset of the upper roll relative to the lower roll can be adjusted, it ensures uniform zero-point determination of the bearings during the embossing process.

[0026] The sleeve change calendar also features active nip control, which allows for selective control of the adjustable pressure within the roll nip to match different pressure zones. Furthermore, the pressure within the roll nip may be specified as hydraulically adjustable. The nip between the upper and lower rolls may be adjustable by a screw spindle with fine threads, which may preferably be specified as adjusting an adjustable wedge that forms the nip. Nip adjustment between the lower and upper sleeve embossing rolls can be performed using an adjustable wedge, and therefore these may be manually adjustable or automatically adjustable by a screw spindle with fine threads. A scale may be provided that can reproduce the nip setting data. Alternatively, the nip setting data may be specified as mechanically adjustable in another way. Furthermore, the wedge may be hydraulically adjustable. Furthermore, nip adjustment can be performed by a piezoelectric method. Alternatively, a fixed spacer may be provided for this purpose.

[0027] Alternatively or additionally, the nip between the upper and lower rolls may be specified as being adjustable by at least two single-acting or double-acting hydraulic cylinders for opening and closing the roll nip. Or, the roll nip may also be adjustable via a spindle.

[0028] A combination of mechanical / hydraulic roll adjustment can be implemented, for example, in such a way that pre-adjustment is performed hydraulically via an adjustable wedge and then fine adjustment is manually performed with a screw spindle using a fine thread. Furthermore, it is possible to control and adjust the hydraulic pressure of roll adjustment separately on the drive side and the operation side.

[0029] The sleeve-changing calendar is provided with at least one laser reference unit for detecting the position of the sleeve on the support core, particularly in the axial and / or radial directions, and it can be defined that the detection of the position of the sleeve on the support core is performed by at least one detectable reference point arranged on the sleeve surface. This enables the sleeve to be automatically set up. By means of laser reference, it is ensured that the embossed patterns of the upper and lower sleeves are accurately aligned. The laser can automatically detect the reference point or registration mark on the sleeve surface and perform automatic axial and radial adjustments. For this purpose, the lower or upper support core can be moved axially by a motor, and the radial adjustment can be performed by a drive motor. In that case, the support core, together with the embossing sleeve mounted thereon, can be driven at an accurate angle using a servo drive motor. And if necessary, final fine adjustment can be performed during production via a user interface.

[0030] The embossed patterns of the upper roll and the lower roll can be aligned with each other via at least one laser reference unit, the reference points on the sleeve surface can be detected via a laser, and it can be defined that the corresponding axial and / or radial adjustment of the rolls relative to each other is performed via at least one axially motor-driven adjustment of the lower support core and / or a radially adjustment by a drive motor. In a pair of rolls, each roll can have a pair of markings, and each pair of markings consists of a first marking running parallel to the roll axis and a second marking running at an angle of 0° to 90°, preferably 45°, relative to the first marking. The markings can be arranged axially at the edges of the outer surfaces of the upper roll and the lower roll. Thereby, the markings can be easily scanned using at least one scan unit that can be arranged a little away from the roll surface and thus from the markings.

[0031] It can be defined that the roll frame is designed with a sealed design and comprises a side stand with vibration damping components integrated with welded cross members.

[0032] For example, a sleeve-changing calendar can be designed for the rotary embossing of a multi-ply web. All of the following types of processes, namely dot / dot, or alternating, or dot / smooth embossing can be carried out. By embossing, ply bonds are created between the individual plies of the multi-ply web. For example, a solid roll such as a rubber surface can also be used for embossing.

[0033] The sleeve embossing roll can be designed as a permanently installed expandable support that can press and fix an exchangeable sleeve by pressure and / or friction. These sleeves are made of high-strength tool steel and may have patterns embossed on their surfaces.

[0034] The adjustment of the support core may be specified to be performed via at least one single-acting or double-acting hydraulic cylinder. Alternatively or additionally, mechanical means for adjusting the support core may also be provided.

[0035] Support core bearings may be specified to have hydraulic clearance releases for the first and / or second support core elements. For example, a set of triple bearings, particularly including precision rolling bearings, may have hydraulic clearance releases for the upper and lower support cores.

[0036] Furthermore, it can be specified that a second support core element, which is displaceable vertically or horizontally, is attached to a pre-loaded and / or ball-bearing precision linear guide within the slide. For example, a set of bearing guides can be provided on a vertically displaceable lower extension support core, and the linear guides can be designed as pre-loaded ball-bearing precision linear guides.

[0037] The present invention further relates to an apparatus comprising a sleeve exchange calendar as described in any one of the prior claims, and a sleeve exchange carriage designed to push a sleeve into or out of a support core. The sleeve exchange carriage may include an AGV so that it can be automatically moved toward or away from the sleeve exchange calendar. The sleeve exchange carriage may be provided with a height-adjustable support surface. The support surface may be provided with a roll conveyor, particularly a rubber roll conveyor, for moving sleeves on the sleeve exchange carriage. The support surface may be at least partially grooved to hold the filled sleeves in a lateral position. The support surface may be designed so that the sleeve exchange carriage can receive two sleeves, and in the apparatus, preferably the sleeves are arranged vertically and parallel on the carriage. This allows for faster sleeve exchange by loading a “new” sleeve to be attached to one of the sleeve support positions on the carriage, and the sleeve support position moving to an empty sleeve exchange calendar. After loading the sleeve to be removed, the sleeve replacement carriage repositions itself so that the sleeve to be installed can be moved, for example, laterally, or pushed into the support core by a carousel provided on the sleeve replacement carriage. The carousel has two support positions that can be alternately aligned with the calendar. This avoids additional movement of the sleeve replacement carriage.

[0038] The present invention also relates to a method for replacing sleeves on a sleeve replacement calendar as described above, the steps being: - Positioning the front of the movable sleeve replacement carriage relative to the calendar, - Loosening the support core, - Pushing the sleeve to be removed from the support core into the sleeve replacement carriage, - Pushing the sleeve to be installed from the sleeve replacement carriage into the support core, Includes.

[0039] This method may also allow the sleeve to be manually pressed in or removed.

[0040] This method may further include equipping the sleeve exchange carriage with a take-up device such as a cable winch or a driven roll conveyor to enable automatic pushing of the sleeve from or into the support core.

[0041] This method may further include sliding the sleeve to be mounted from the sleeve exchange carriage onto the support core, aligning the support core with a laser reference unit, and clamping the support core. Clamping the support core may involve generating separate pressures (e.g., equal pressure or different pressures) in different pressure zones.

[0042] If the operating bearing is designed as a folding bearing, this method may further include the step of pulling out the folding bearing and swinging it laterally away from the rolling device before pushing the sleeve to be removed from the support core into the sleeve replacement carriage.

[0043] The removed sleeves can be stored in a separate storage area and on a transport pallet.

[0044] The laser reference unit allows for the detection of the actual sleeve position on the support core, ensuring that the embossed molds on the upper and lower sleeves are precisely aligned. The laser detects the registration marks on the outer surface of the sleeve, allowing for automatic axial and radial adjustments based on this information. For this purpose, the lower or upper support core can be moved axially by a motor, and radial adjustments can be performed by a drive motor.

[0045] Furthermore, quick core replacement is possible. The entire support core can be replaced with another support core, such as a support core of a different diameter, or a solid roll. For this purpose, the entire drive system can be mounted on a separate console.

[0046] Exemplary embodiments of the present invention will be described with reference to the following figures. [Brief explanation of the drawing]

[0047] [Figure 1] This is a cross-sectional view of an exemplary embodiment of the sleeve replacement calendar according to the present invention. [Figure 2] This is a cross-sectional view of a sleeve replacement calendar through a roll. [Figure 3] This is a side view of a sleeve exchange carriage positioned on a sleeve exchange calendar according to the present invention. [Figure 4] This is a front view of the sleeve replacement carriage positioned on the sleeve replacement calendar. [Modes for carrying out the invention]

[0048] The sleeve exchange calendar 1 shown in Figure 1 has an upper roll 12 and a lower roll 13 mounted on a roll frame 7. A roll nip 19 is formed between the two rolls, through which absorbent, preferably finely crepe-processed, cellulose-based sanitary paper, such as multiply tissue material, can pass and be embossed into a tissue web according to a predetermined pattern. The tissue material may be designed for use as, for example, toilet paper, kitchen paper, paper napkins, or paper handkerchiefs. The rolls 12 and 13 each have an expandable support core 3, on which their respective replaceable sleeves 4 are mounted, their outer surfaces 16 rolling against each other within the roll nip 19. The roll spacing 19 can be adjusted by mutually adjustable wedges 20, which can be adjusted by fine threads, thereby allowing the adjustment spindle to have different thread pitches. Thus, beyond a predetermined roll distance, it can be specified that the thread pitch of the spindle is larger than in the smaller area of ​​the roll nip 19. To minimize vibration, the roll frame 7 is equipped with a vibration damper 6. Vibration dampers 6 are positioned between the roll frame 7 and the hydraulic cylinder 9 that supports the slide 28. The rolls 12 and 13 are hydraulically adjustable relative to each other, with the upper roll 12 or its support core element 3 being non-adjustably mounted within the roll frame 7 of the sleeve exchange calendar 1, and the lower roll 13 or its lower support core element 3 being mounted within a slide 28 provided within the roll frame 7, through which the lower support core element 3 can be hydraulically adjusted relative to the first support core element 3. The slide may include vertical linear guides along with sliding bearings, as shown in the figure. Bearings in the roll frame are provided via triple bearings 21 on the drive side 25 and the operating side 17, thereby improving the rigidity of the shaft. Bearing cooling devices 14 are positioned within the bearing cover, particularly around the bearing points, so that each support core bearing point is cooled individually.On the drive side, rolls 12 and 13 are driven in opposite directions by motors 25 connected to the rolls via removable clutches 27. Furthermore, a gear is positioned between the motors 25 and the clutches 27, which can be specifically designed as an angle gear. The operating bearing 17 is designed as a folding bearing, allowing it to be axially removed from the shaft journal via a linear guide 18 and pivot laterally from the roll axis. This makes sleeve replacement particularly easy and quick. This allows the sleeve replacement carriage 24 to be moved axially toward the sleeve to be replaced, enabling the removed sleeve to be quickly pushed horizontally onto the support surface of the sleeve replacement carriage 24. The new sleeve can then be installed in the opposite direction in the same manner. The bearing 17 is then pivoted back and pushed back into its respective shaft journal via the linear guide 18. The desired bearing preload can then be set using a hydraulic clearance release. On the drive side, a multi-channel rotary feedthrough 23 is provided, through which individual pressures can be applied to different pressure zones 10 of one of the multi-chamber systems 11 provided within the support core. The pressure zones 10 are spaced apart axially from one another, extend in annular shape within the support core, and are substantially parallel to the roll axis. Each pressure zone 10 is connected to a separate medium channel 15. Detail E shown in Figure 1 is an exaggerated detail representation of the pressure curve within the roll nip 19, and the figure shows a cross-section of the support core 3 with the pressure zones 10. It can be seen that because the various pressure zones 10, spaced apart axially, are subjected to different pressures, the outer circumference D of the sleeve 4 stretched over the support core 3 changes axially, and accordingly different pressures are set in the roll nip 19. The pressure zones 10 can be designed such that uniformly sized pressure zones 10 are positioned opposite each other on the upper roll 12 and the lower roll 13.To rotate and align the upper roll 12 and the lower roll 13 relative to each other, the sleeve change calendar 1, in the illustrated embodiment, further comprises a laser reference unit 5 that scans the lower roll 13 from below and the upper roll 12 from above to measure the alignment of the marks provided on the sleeve. To correct the alignment, the two rolls 12 and 13 can be rotated relative to each other until the marks are precisely aligned in place.

[0049] Figure 2 shows a cross-sectional view of one of the rolls of the sleeve exchange calendar 1, namely the upper roll 12 or the lower roll 13. This figure shows a multi-chamber system 11, which comprises multiple pressure zones 10 in the axial direction of the rolls 12, 13. These pressure zones 10 are formed around the outer circumference of the support core 3 and serve to create a frictional connection between the support core 3 and the sleeve 4 pressed axially into it. The illustrated embodiment shows four pressure zones 10, each having the same width and preferably extending uniformly across the entire width of the roll. Thus, each pressure zone 10 has a width that extends axially across a portion of the rolls 12, 13. Furthermore, since each pressure zone 10 is formed annularly in the tangential direction of the support core 3, the pressure acting on the sleeve 4 is uniform across the circumference. Each pressure zone 10 has a separate fluid supply section, and each fluid channel 15 has a first portion 15.1 that extends axially through a support core, and a second portion 15.2 that branches radially perpendicularly from the first portion 15.1 and leads to the corresponding pressure zone 10 assigned to each fluid channel 15.

[0050] Preferably, the sleeve exchange calender 1 has a three-part structure with a central support core 3 on which a first zone sleeve having a pressure zone 10 is pressed, i.e., contracted. An exchangeable sleeve 4 having a molded outer circumference 8 is pressed onto its outer circumference. The pressure zone 10 is formed as a recess on the inside of the zone sleeve facing the support core 3. At least one of the fluid channels 15 leads to each of the recesses.

[0051] Figure 3 shows a side view of a sleeve replacement carriage 24 positioned on a sleeve replacement calendar 1 according to the present invention. In the example, the process of pulling a sleeve 4 from the support core 3 of the upper roll 12 is being performed, and the sleeve 4 is pushed horizontally onto the upper sleeve receiving device 29 of the sleeve replacement carriage 24. To replace the sleeve 4, the sleeve receiving device 29 is moved toward the sleeve replacement calendar 1 so that the upper surface of the receiving device 29 that receives the sleeve 4 is aligned with the upper surface of the support core 3 of the rolls 12 and 13 whose sleeves are being replaced. To remove the sleeve 4, the sleeve replacement carriage 29 may be equipped with a motor-driven removal device, such as a plurality of drive rolls that can move the sleeve horizontally. The sleeve replacement carriage 24 is provided with two sleeve receiving devices 29 positioned vertically above and below each other, so that the sleeve replacement carriage 24 can receive sleeves 4 from both the upper roll 12 and the lower roll 13 at once. The sleeve receiving devices 29 can be mounted on the sleeve replacement carriage 24 in a height-adjustable manner. This allows the sleeve receiving devices 29 to be moved successively to aligned transport positions that have the sleeves 4 to be removed. Alternatively, it can be specified that the vertical distance between the sleeve receiving devices 29 is set such that both sleeve receiving devices 29 are already aligned with their respective support cores 3 when the sleeve replacement carriage 24 approaches the sleeve replacement calendar 1. The sleeve replacement carriage 24 has a chassis 30 with rollers 31, a retaining frame 32 mounted on the chassis 30, and the sleeve receiving devices 29 are fixed to the retaining frame 32.

[0052] Figure 4 shows a front view of the sleeve replacement carriage 24 positioned at the operator-side end of the sleeve replacement calendar 1 during the sleeve replacement process. It can be seen that the operator-side bearing 17 is axially pulled out from the support core 3 and moved laterally, i.e., radially, via the horizontal linear guide 33, to allow for sleeve replacement. The horizontal linear guide 33 is mounted on the roll frame 7. In particular, it may be specified that the sleeve replacement carriage 24 and / or the sleeve replacement calendar 1 be provided with a positioning device that allows the sleeve replacement carriage 24 to be automatically centered on the sleeve replacement calendar 1 so that sleeve replacement can be performed as soon as the sleeve replacement carriage 24 moves toward the sleeve replacement calendar 1. As shown in Figure 4, the sleeve receiving device 29 is mounted on the sleeve replacement carriage 24 so as to be adjustable both in the height and later directions. The retaining frame 32 may be specified to be movable relative to the chassis 30. Furthermore, the sleeve replacement carriage 24 may be specified to have two or four sleeve receiving devices 29. In an embodiment with four sleeve receiving devices 29, it is possible to bring in two new sleeves 4 for sleeve replacement. Thus, first the sleeve 4 to be replaced is removed, then the sleeve receiving devices 29 are laterally adjusted on the sleeve replacement carriage, or the sleeve replacement carriage 24 is moved laterally to pull the sleeve 4 to be pulled onto the support core 3.

[0053] The features of the present invention disclosed in the above description, figures, and claims may be essential to the implementation of the invention, either individually or in any combination. [Explanation of Symbols]

[0054] 1. Sleeve Replacement Calendar 3. Support core 4 sleeves 4.1 Zone Sleeves 5. Laser Reference Unit 6. Vibration damper 7 Roll Frame 8-type carving (Sculpture) 9. Hydraulic Cylinder 10 pressure zones 11 Multi-chamber system 12 Top Roll 13 Lower Roll 14. Bearing cooling Device 15 media channels 16 External surface 17 Operating side bearing 18 Linear Guide 19 Roll Nips 20 Wedge 21 Triple Bearing 23 rotation feedthrough 24 Sleeve replacement for carriage 25 Drive motor / drive side 27 Clutch 28 slides 29 Sleeve holding device 30 Chassis 31 Rollers 32 Support Frame 33 Linear Guide D Sleeve outer diameter Exaggerated details of the pressure curve of the E roll nip This application provides the invention in the following embodiments. (Aspect 1) A sleeve exchange calender (1) for rotary embossing a multiply web (2) or for creating ply bonds between individual plies of the multiply web (2), The sleeve exchange calendar (1) has a roll frame (7) to which at least one roll (12, 13) is attached, and an expandable support core (3) and an exchangeable sleeve (4) are attached to the roll frame (7). The sleeve (4) can be pressed into the support core (3) for assembly and can be fixed to the support core (3) by friction fit. The support core (3) is characterized by being designed to include a multi-chamber system (11) for individually applying pressure to separate pressure zones (10). The aforementioned sleeve replacement calendar (1). (Aspect 2) The sleeve change calendar (1) according to embodiment 1, wherein each of the pressure zones (10) can be subjected to individually adjustable pressure, thereby enabling the generation of different embossing zones to be selectively and / or spatially separated, and the pressure zones (10) are divided along the axial direction of the rolls (12, 13). (Aspect 3) The sleeve replacement calendar (1) according to embodiment 1 or embodiment 2, wherein the outer diameter (D) of the sleeve is partially adjustable in a pressure-controlled manner via hydraulics that can be adjusted separately in the individual pressure zones (10) of the support core (3). (Aspect 4) The sleeve replacement calendar (1) according to any one of embodiments 1 to 3, wherein the support core (3), in particular the first support core element (5), has at least one rotating feedthrough (23) for transmitting hydraulic oil. (Aspect 5) The sleeve change calendar (1) according to embodiment 4, wherein each pressure zone (10), or a hydraulic cylinder (9) assigned to the pressure zone (10), can be subjected to pressure via a separate medium channel (15) connected to the at least one rotary feedthrough (23). (Aspect 6) The sleeve replacement calendar (1) according to any one of embodiments 1 to 5, wherein the support core (3) has an outer surface that is polished in a conical shape and / or coated with a highly wear-resistant material. (Aspect 7) The sleeve (4) is made of high-strength tool steel and / or has a molded surface, as described in any one of embodiments 1 to 6, of the sleeve replacement calendar (1). (Pattern 8) The sleeve replacement calendar (1) according to any one of embodiments 1 to 7, wherein the support core (3) is attached to three locations on the roll frame (7). (Aspect 9) The sleeve replacement calendar (1) according to any one of embodiments 1 to 8, wherein the bearing of the support core is temperature-controlled by cooling, in particular, all support core bearing points, via bearing cooling (21). (Aspect 10) A sleeve replacement calendar (1) according to any one of embodiments 1 to 9, wherein the drive-side bearing (17) is securely mounted within the roll frame (7) or slide (28). (Aspect 11) A sleeve change calendar (1) according to any one of embodiments 1 to 10, wherein the operating side bearing (17) is designed as a folding bearing, and / or the operating side roll bearing (17) is openable and closable via a linear guide (18) and / or a ball bushing. (Aspect 12) A sleeve replacement calendar (1) according to any one of embodiments 1 to 11, having an upper roll (12) and a lower roll (13), wherein the center offset of the upper roll (12) relative to the lower roll (13) is adjustable. (Aspect 13) The sleeve change calendar (1) according to any one of embodiments 1 to 12 further includes active nip control, which allows the adjustable pressure in the roll nip (19) to be selectively controlled to match the different pressure zones. (Aspect 14) The sleeve change calendar (1) according to embodiment 12 or embodiment 13, wherein the roll nip (19) between the upper roll (12) and the lower roll (13) is adjustable by a screw spindle having fine threads, the screw spindle preferably adjusts an adjustable wedge (20) that forms the roll nip (19). (Aspect 15) The sleeve change calendar (1) according to embodiment 12 or embodiment 13, wherein the roll nip (19) between the upper roll (12) and the lower roll (13) is further adjustable by at least two single-acting or double-acting hydraulic cylinders (9) for opening and closing the roll nip (19). (Aspect 16) A sleeve replacement calendar (1) according to any one of embodiments 1 to 15, comprising at least one laser reference unit for detecting the position of the sleeve on the support core (3), wherein the detection of the position of the sleeve on the support core (2) is performed by at least one detectable reference point located on the surface of the sleeve. (Aspect 17) The sleeve replacement calendar (1) according to embodiment 15, wherein the embossed die-cuts (8) of the upper roll (12) and the lower roll (13) can be aligned with each other via the at least one laser reference unit, the reference point on the outer surface of the sleeve can be detected via the laser, and corresponding axial and / or radial adjustments of the rolls (12, 13) relative to each other are performed via motor-driven axial adjustment and / or radial adjustment by a drive motor of at least one of the support cores (3). (Aspect 18) The sleeve replacement calendar (1) according to any one of embodiments 1 to 17, wherein the roll frame (7) is designed to be a sealed structure and has a side stand with a cross member welded to it and an integrated vibration damping component. (Aspect 19) An apparatus comprising a sleeve replacement calendar (1) as described in any one of embodiments 1 to 18, and a sleeve replacement carriage (24) designed to push a sleeve (4) into the support core (3) or push a sleeve (4) out of the support core (3). (Aspect 20) A method for replacing a sleeve (4) on a sleeve replacement calendar (1) as described in any one of the embodiments 1 to 18, - Positioning the front surface of the movable sleeve replacement carriage (24) relative to the calendar (1), - Loosening the support core (3), - Pushing the sleeve (4) to be removed from the support core (3) into the sleeve replacement carriage (24), - The sleeve (4) to be installed is pushed from the sleeve replacement carriage (24) onto the support core (3), The method comprising the step of

Claims

1. A sleeve change calender for rotary embossing a multiply tissue web or for creating ply bonds between individual plies of the multiply tissue web, wherein the sleeve change calender has a roll frame to which at least two rolls are mounted, the roll frame having an expandable support core and a replaceable sleeve mounted thereon, the sleeve being able to be pressed onto the support core for assembly and being able to be secured on the support core by friction fit, and the support core being designed with a multi-chamber system for individually applying pressure to separate pressure zones.

2. The sleeve change calendar according to claim 1, wherein each of the pressure zones can be subjected to an individually adjustable pressure, thereby enabling the generation of different embossing zones to be selectively and / or spatially separated, and the pressure zones are divided along the axial direction of the roll.

3. The sleeve replacement calendar according to claim 1, wherein the outer diameter (D) of the sleeve is partially adjustable in a pressure-controlled manner via hydraulics that can be individually adjusted in the separate pressure zones of the support core.

4. The sleeve replacement calendar according to claim 1, wherein the support core, in particular the first support core element, has at least one rotational feedthrough for transmitting hydraulic oil.

5. The sleeve change calendar according to claim 4, wherein each pressure zone, or a hydraulic cylinder assigned to the pressure zone, can be subjected to pressure via a separate medium channel connected to the at least one rotary feedthrough.

6. The sleeve replacement calendar according to claim 1, wherein the support core has an outer surface that is polished in a conical shape and / or coated with a highly wear-resistant material.

7. The sleeve replacement calendar according to claim 1, wherein the sleeve is made of high-strength tool steel and / or has an engraving on its surface.

8. The sleeve replacement calendar according to claim 1, wherein the support core is attached to the roll frame at three locations via a drive-side bearing, an operating-side bearing, and a bearing positioned between the drive-side bearing and the operating-side bearing.

9. The sleeve replacement calendar according to claim 1, wherein the support core bearing of the support core is temperature-controlled by cooling the bearing, in particular all of the support core bearing points.

10. The sleeve replacement calendar according to claim 8, wherein the drive bearing is securely mounted within the roll frame or slide.

11. The sleeve replacement calendar according to claim 8, wherein the operating bearing is openable and closable via a linear guide and / or ball bushing.

12. A sleeve replacement calendar according to claim 1, wherein the at least two rolls attached to the roll frame are an upper roll and a lower roll, the sleeve replacement calendar wherein the center offset of the upper roll relative to the lower roll is adjustable.

13. The sleeve change calendar according to claim 12, further comprising active nip control, which allows the adjustable pressure in the roll nip formed between the upper roll and the lower roll to be selectively controlled to match the separate pressure zones.

14. The sleeve change calendar according to claim 13, wherein the roll nip between the upper roll and the lower roll is adjustable by a screw spindle having a fine thread, the screw spindle adjusting an adjustable wedge that forms the roll nip.

15. The sleeve change calendar according to claim 13, wherein the roll nip between the upper roll and the lower roll is further adjustable by at least two single-acting or double-acting hydraulic cylinders for opening and closing the roll nip.

16. The sleeve replacement calendar according to claim 12, further comprising at least one laser reference unit for detecting the position of the sleeve on the support core, the laser reference unit being configured to detect at least one reference point located on the surface of the sleeve, and to perform axial and radial adjustments to precisely align the sleeve.

17. The sleeve replacement calendar according to claim 16, wherein the embossing engravings of the upper roll and the lower roll can be aligned with each other via the at least one laser reference unit, the reference point on the outer surface of the sleeve can be detected via the laser, and corresponding axial and / or radial adjustments of the rolls relative to each other are performed via motor-driven axial adjustment and / or radial adjustment by a drive motor of at least one of the support cores.

18. The sleeve replacement calendar according to claim 1, wherein the roll frame is designed to be a sealed structure and has a side stand with a cross member welded to it and an integrated vibration damping component.

19. An apparatus comprising a sleeve replacement calendar according to claim 1, and a sleeve replacement carriage designed to push a sleeve into or out of the support core.

20. A method for replacing a sleeve on a sleeve replacement calendar according to claim 1, - Positioning the front of the movable sleeve replacement carriage relative to the calendar, - Loosening the support core, - Pushing the sleeve to be removed from the support core into the sleeve replacement carriage, - Pushing the sleeve to be installed from the sleeve replacement carriage onto the support core, The method comprising the step of

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