Film winding device, film production system and method for winding a film web

Abstract

A film winding device (10) for winding a film web (12) into a film bale (28) with a winding device (16) and a feed device (18) is shown. The feed device (18) has a feed carriage (30), a contactor (36), and at least one tensioner (38), wherein the tensioner (38) is fastened to the feed carriage (30) and the tensioner (38) is arranged in front of the contactor (36) so that the tensioner (38) can adjust a film tension of the film web (12). The tensioner (38) has a cylinder (54), wherein the cylinder (54) has a microporous surface (62) at least in the region of the arch (58). A film production system (100) and a method for winding a film web (12) are also shown.

Description

[0001] The invention relates to a film winding device, a film production plant and a method for winding a film web.

[0002] Film production lines are used to produce a film web from a plastic melt that has specific material properties for specific purposes. These film production lines include film stretching lines with stretching stages in the longitudinal and / or transverse directions.

[0003] The line speed of such film stretching lines is constantly increasing. One of the challenges in this context is winding the finished starting product, namely the film web.

[0004] For this purpose, film winding devices are known that wind up the produced film web. During winding, care must be taken to avoid wrinkles in the film web, so that the individual layers can be easily separated later. This is achieved by maintaining as constant a film tension as possible during winding.

[0005] Depending on the type of film to be produced, specific system parameters must be maintained or achieved. Ultra-thin films or membrane films, such as battery separator film (BSF), are particularly challenging to produce. Unlike films made of PET or PP, for example, only minimal film tension is permitted when producing ultra-thin films such as BSF.

[0006] However, this leads to problems, as at low film tensions, the film winding device requires high dynamics to compensate for changes in the film tension. Furthermore, setting up conventional film winding devices is extremely complex, as the rollers and rolls used must be precisely aligned with each other.

[0007] It is therefore an object of the invention to provide a film winding device, a film production plant and a method for winding a film web, which can ensure the lowest possible film tension and are easy to set up.

[0008] The object is achieved by a film winding device for winding a film web into a film bale, in particular a film web made of ultra-thin film. The film winding device has a winding device and a feed device, wherein the winding device has at least one winding core and is designed to wind a film bale onto the winding core. The feed device has a feed carriage, a contactor and at least one tensioner, wherein the contactor is fastened to the feed carriage and is arranged adjacent to the winding core such that the contactor can guide the film web to the winding core or to the film bale on the winding core. The tensioner is fastened to the feed carriage and is arranged in front of the contactor in the running direction of the film web such that the tensioner can adjust a film tension of the film web.The tensioner has a cylinder with a lateral surface, wherein the cylinder has an arc in cross section and the lateral surface has a microporous surface at least in the region of the arc.

[0009] By using a cylinder as a tensioner, a more dynamic control of the film tension is possible, since the tensioner does not have to be set in rotation by the film web due to the cylinder and the microporous surface and therefore has only a low mass inertia.

[0010] For example, the cylinder is at least partially hollow, in particular completely hollow.

[0011] For example, the feed device is located upstream of the winding device in the direction of travel of the film web. In particular, the tensioner guides the film web to the contactor.

[0012] In one aspect, the feed carriage is linearly movable relative to the winding device toward and away from the winding device. It is also conceivable that the feed carriage is immobile relative to the winding device.

[0013] The length of the contactor, in particular the contact roller, and the cylinder corresponds at least to the width of the film web. The width of the film web is, for example, between 1.5 m and 15 m, such as 6.2 m, 10.4 m, or 12 m.

[0014] It is also conceivable that the winding device has two or more winding cores, whereby the film web is always guided to only one of the cores and a film bale is wound onto this core.

[0015] By means of the film winding device according to the invention, the film production plant according to the invention and the method according to the invention, monoaxially or biaxially stretched thin films, in particular battery separator films (BSF), PPK films (PP capacitor film), PETK films (PET capacitor film) and membranes, such as PTFE membranes (polytetrafluoroethylene), can be produced and wound.

[0016] Thicker films can also be produced by means of the film winding device according to the invention, the film production plant according to the invention and the method according to the invention.

[0017] Ultra-thin films are defined as films or foils with thicknesses less than 10 µm, especially less than 5 µm. BSFs are also ultra-thin films in this sense.

[0018] In particular, the film winding device is a film winding device for winding a battery separator film (BSF) into a film bale.

[0019] The film tensions achievable by a film winding device according to the invention are in the range from 1 N / m to 200 N / m, in particular in the range from 5 N / m to 15 N / m.

[0020] For example, due to the viscoelastic properties of battery separator films, a high contact pressure of a contact roller on the film bale (wrapped bale) or the winding core is not possible. For winding BSF, for example, the contact pressure is in the range of 0 N / m to 100 N / m, particularly in the range of 1 N / m to 10 N / m.

[0021] The film winding device can, for example, wind film webs at a speed in the range of 40 m / min to 350 m / min, in particular at a speed of 150 m / min.

[0022] The arc is, in particular, a circular arc. However, the arc can also be based on a geometry other than a circle. For example, the arc can have an elliptical or clothoid shape.

[0023] In one embodiment, the arc corresponds to an angle of at least 90°, in particular at least 180°, especially at least 200°, whereby the wrapping of the cylinder with the film web is large and thus the load on the film web is small.

[0024] This also applies to the cylinder of the deflector.

[0025] The cross section of the cylinder of the tensioner and / or the cylinder of the deflector is, for example, a circular sector with circular radii and the arc.

[0026] In one embodiment, the microporous surface has a plurality of openings having a diameter of less than 900 µm, in particular less than 500 µm, whereby a particularly homogeneous air cushion is achieved.

[0027] In particular, the openings are evenly distributed over the microporous surface.

[0028] For example, the microporous surface extends along at least 80%, in particular at least 90% of the length of the cylinder.

[0029] In the circumferential direction, the microporous surface extends, for example, along at least 80%, in particular at least 90% of the circumferential length of the sheet.

[0030] In one embodiment of the invention, the feed device comprises at least one deflector, which is attached to the feed carriage and is arranged in front of the tensioner in the running direction of the film web or between the tensioner and the contactor in the running direction of the film web. The at least one deflector comprises a cylinder with a lateral surface, the cylinder having a curved cross-section and the lateral surface having a microporous surface at least in the region of the curved section. In this way, the travel path of the film web can be selected more freely.

[0031] For example, at least one deflector is immovably attached to the feed carriage.

[0032] For example, the feed device has at least two deflectors, one of the deflectors being arranged in front of the tensioner in the running direction of the film web and another of the deflectors being arranged in the running direction of the film web between the tensioner and the contactor.

[0033] In one embodiment, the cylinder of the tensioner and / or the deflector has a compressed air connection by means of which compressed air can be introduced into the interior of the cylinder, whereby the cylinder can be flexibly supplied with compressed air.

[0034] For example, a compressed air source of the film winding device or the film production system is connected to the compressed air connection in such a way that the compressed air source generates an overpressure inside the cylinder.

[0035] In one embodiment, the thickness of the film web is less than 10 µm, in particular less than 5 µm. Thus, even very thin films or foils can be wound.

[0036] To ensure the desired contact pressure precisely, the contactor can have a contact roller.

[0037] In one embodiment, the contactor has at least one adjustment mechanism with an adjustment rail and an adjustment carriage, wherein the contact roller is movably attached to the feed carriage by means of the at least one adjustment mechanism, in particular linearly movable, whereby the contact roller can be moved extremely dynamically, so that the contact pressure can also be adjusted extremely dynamically.

[0038] For example, the direction of movement of the adjustment mechanism is parallel to the direction of movement of the feed carriage and / or the contact roller is attached to the feed carriage.

[0039] In one embodiment, the tensioner has at least one adjustment mechanism with an adjustment rail and an adjustment slide, wherein the cylinder is movably attached to the feed slide by means of the at least one adjustment mechanism, in particular for linear movement. In this way, the film tension can be adjusted particularly precisely.

[0040] The direction of movement of the adjustment mechanism is particularly parallel to the direction of movement of the feed carriage.

[0041] For example, the adjustment rail and / or the adjustment slide have air outlet openings such that an air bearing can be provided for the adjustment slide. In particular, the adjustment rail and / or the adjustment slide can be connected to the compressed air source.

[0042] It is also conceivable that the adjustment rail and the adjustment slide provide a hydrostatic bearing.

[0043] To further reduce the mass to be moved, the tensioner and / or the contactor can have two of the adjustment mechanisms, wherein the cylinder or the contact roller is fastened with one of its end faces to one of the adjustment mechanisms.

[0044] For particularly precise adjustment, the at least one adjustment mechanism can have at least one adjustment actuator which is connected to the adjustment slide and which is configured to move the adjustment slide linearly.

[0045] It is also conceivable that the adjustment mechanisms have a common adjustment actuator.

[0046] In one embodiment of the invention, the feed device has at least one feed rail for the feed carriage, in particular wherein the feed rail and / or the feed carriage has air outlet openings such that an air bearing can be provided for the feed carriage, whereby the contactor can be displaced over a large area in order to accommodate the increasing film bale on the film sleeve.

[0047] The feed rail and / or the feed carriage are in particular connected to the compressed air source.

[0048] It is also conceivable here that the feed rail and the feed carriage form a hydrostatic bearing.

[0049] For precise adjustment, the feed device may comprise at least one feed actuator which is connected to the feed carriage and which is configured to move the feed carriage linearly.

[0050] In one embodiment, the film winding device comprises a control device configured to control the feed device such that the contactor, in particular the contact roller, bears against the winding core or the film bale on the winding core with a predetermined contact pressure, in particular by controlling the feed actuator and / or the adjustment actuator of the contactor, and / or to control it such that the tensioner, in particular the cylinder of the tensioner, applies a specific film tension to the film web, in particular by controlling the adjustment actuator of the tensioner. In this way, control or regulation of the contact pressure and / or the film tension is possible.

[0051] The object is further achieved by a film production plant with at least one film stretching plant and a film winding device as described above.

[0052] The features and advantages described for the film winding device apply equally to the film production system and vice versa.

[0053] Furthermore, the object is achieved by a method for winding up a film web, in particular a film web made of battery separator film, by means of a film winding device as described above and / or a film production plant as described above, in particular wherein the contactor, in particular the contact roller, rests with a predetermined contact pressure on the winding tube or on the film bale on the winding tube, and / or a specific film tension is applied to the film web by the tensioner, in particular the cylinder.

[0054] The features and advantages described for the film winding device and / or the film production plant apply equally to the process and vice versa.

[0055] Further features and advantages of the invention will become apparent from the following description and the accompanying drawings, to which reference is made. In the drawings: Fig. 1 shows a film production plant according to an embodiment of the invention with a film winding device according to an embodiment of the invention in a schematic view, Fig. 2 shows a schematic view of the film winding device according to Figure 1 , Figs. 3, 4 the parts of the film winding device according to Figure 2 which guide the film web in side view and in perspective view, Fig. 5 a schematic representation of the tensioner of the film winding device according to Figure 2 , Fig. 6 an enlarged view of one of the adjustment mechanisms according to Figure 5 , and Fig. 7 a second embodiment of the film winding device according to the invention.

[0056] Figure 1shows a film production plant 100 with a film winding device 10 according to the invention and a film stretching plant 110. The film stretching plant 110 can be designed as a longitudinal stretching plant or transverse stretching plant or sequential stretching plant with a longitudinal stretching stage and a transverse stretching stage or as a simultaneous stretching plant.

[0057] The film stretching system 110 serves to produce a plastic film web, which is referred to simply as film web 12 in the context of this disclosure. For this purpose, the film stretching system 110 is divided into various zones 110a, 110b, 110c, 110d, and 110e. However, not all of these zones 110a, 110b, 110c, 110d, and 110e need actually be present.

[0058] In the various zones 110a to 110e, the film web 12 is exposed to different temperatures in order to generate or adjust certain film properties. The first zone 110a is also referred to as the preheating zone. The second zone 110b is referred to as the stretching zone, whereas the third zone 110c is referred to as the further heating zone. The fourth zone 110d is also referred to as the neutral zone, and the fifth zone 110e is referred to as the cooling zone. In principle, there can be fewer or additional neutral zones between the individual zones 110a to 110e to ensure separation of the zones 110a to 110e, so that the individual zones 110a to 110e influence each other less strongly (the air flows from one zone 110a to 110e into the other).With the film stretching system 110 it is possible to produce film webs 12 with a width that is greater than 2 m, 3 m, 4 m, 5 m, 6 m, 7 m, 8 m, 9 m, 10 m, 11 m, 12 m, 13 m or greater than 14 m, but which is, for example, smaller than 15 m, 14 m, 13 m, 12 m, 11 m, 10 m, 9 m, 8 m, 7 m, 6 m, 5 m, 4 m or smaller than 3 m.

[0059] For example, the working width, ie the width of the film web 12, the film stretching system 110 and the film winding device 10 is 6.2 m, 10.4 m, or 12 m.

[0060] The film stretching system 110 comprises an inlet area 111, wherein a film to be stretched can be fed to the film stretching system 110 at its inlet area 111. The stretched film web 12 exits at the end of the film stretching system 110, i.e., at its outlet area 112. The outlet area 112 of the film stretching system 110 is connected to a film inlet area 14 of the film winding device 10 according to the invention.

[0061] As stated above, different film types should be wound differently, as this is the only way to ensure that the winding process is wrinkle-free and that sufficient air is introduced between the individual layers to ensure trouble-free unwinding of the film web 12 in subsequent process steps. The winding method according to the invention also ensures that the film web 12 does not tear.

[0062] The film web 12 is, in particular, a film web with a thickness of less than 10 µm, in particular less than 5 µm. For example, the film web 12 is made of a battery separator film (BSF), but the film web 12 can also be made of another material.

[0063] As mentioned at the beginning, winding battery separator foils is particularly challenging. Winding can only be carried out with low contact force and low foil tension.

[0064] In Figure 2the film winding device 10 is shown schematically.

[0065] The film winding device 10 has a winding device 16 and a feeding device 18.

[0066] It is also conceivable for the film winding device 10 to have a compressed air source 20, such as an air compressor. The compressed air source 20 can also be designed as one or more connections to a central compressed air supply, for example, to a central compressed air supply of the film production system 100.

[0067] The film winding device 10 also has a control device 22 that controls the feed device 18, the winding device 16, and the compressed air source 20. For example, the control device 22 is designed separately or as part of a control device for the film production system 100.

[0068] The feed device 18 is arranged upstream of the winding device 16 in the direction of travel of the film web 12. The feed device 18 therefore receives the film web 12 via the film entry area 14 and transfers the film web 12 to the winding device 16.

[0069] The winding device 16 has at least one winding core 24; in the embodiment shown, there are two winding cores 24.

[0070] The winding cores 24 can each rotate about their central axis, in particular they are driven.

[0071] The winding tubes 24 are arranged together on a rotatable base body of the winding device 16, by means of which one of the winding tubes 24 can be moved into a winding position (in Figure 2the position of the left of the two winding cores 24). In the winding position, the corresponding winding core 24 can receive the film web 12 from the feed device 18 and wind it up, so that a film bale 28 is produced on the winding core 24.

[0072] In the embodiment shown, the feed device 18 has a feed carriage 30, at least one feed rail 32, a feed actuator 34, a contactor 36, a tensioner 38 and two deflectors 40.

[0073] The contactor 36, the tensioner 38 and the two deflectors 40 are attached to the feed carriage 30.

[0074] The two deflectors 40 are fixed, i.e. immovable, to the feed carriage 30.

[0075] The contactor 36, the tensioner 38 and the two deflectors 40 guide the film web 12 to the winding device 16 and are in the Figure 3 and 4 shown in isolation.

[0076] Starting from the film entry area 14 and following the running direction of the film web 12, the film web 12 runs from the film entry area 14 first to a first of the deflectors 40 and is deflected there in the direction of the tensioner 38.

[0077] At the tensioner 38, the film web 12 undergoes a further deflection and then runs to the second deflector 40, which is arranged between the tensioner 38 and the contactor 36.

[0078] At the second deflector 40, the film is directed to the contactor 36, and the contactor 36 feeds the film web 12 to the winding device 16. More precisely, the contactor 36 feeds the film web 12 onto the winding core 24 or onto a film bale 28 already formed on the winding core 24. The contactor 36 is thus arranged adjacent to the winding core 24.

[0079] The contactor 36 has a contact roller 42 and an adjustment mechanism 44. The contact roller 42 is attached to the feed carriage 30 for linear movement by means of the adjustment mechanism 44.

[0080] In the embodiment shown, the tensioner 38 and the two deflectors 40 do not have rollers, but each have a cylinder 54, which is hollow and non-rotatable.

[0081] The length of the cylinders 54 of at least the tensioner 38 but also the deflector 40 transverse to the running direction of the film web 12 is greater than the width of the film web 12.

[0082] For example, the contact roller 42 and the cylinders 54 of the tensioner 38 and the deflector 40 have the same length in the direction transverse to the running direction of the film web 12.

[0083] Each of the cylinders 54 has a non-circular outer surface 56. Unless otherwise stated, the following statements apply in particular to each of the cylinders 54 of the tensioner 38 and the deflectors 40.

[0084] The cross-section of cylinder 54 has at least one arc 58, i.e., a portion of the lateral surface 56 that describes an arc. For example, arc 58 is a circular arc. However, arc 58 can also have a different shape, for example, an elliptical or clothoidal shape.

[0085] In the embodiment shown, the cross section of the cylinder 54 is a circular sector with the arc 58 and two circular radii 60, which extend at the ends of the arc 58 towards the center of the circle.

[0086] An angle is enclosed between the circular radii 60 which corresponds to the angle of the arc 58.

[0087] In the embodiment shown, the angle corresponding to the arc 58 of the cylinder 54 of the tensioner 38 is greater than 180°, in particular greater than 200°.

[0088] For example, the angle corresponding to the arc 58 of the cylinder 54 of the first deflector 40 is also greater than 180°, in particular greater than 200°.

[0089] The angle corresponding to the arc 58 of the cylinder 54 of the second deflector 40 is less than 180° but greater than 90°.

[0090] The lateral surface 56 is a microporous surface 62 in the region of the arch 58, so that the lateral surface 56 has a plurality of openings extending through the lateral surface 56. For example, the diameter of the openings is each less than 900 µm, in particular less than 500 µm.

[0091] In particular, the openings are evenly distributed over the microporous surface 62, for example in a grid or lattice.

[0092] For example, the microporous surface 62 extends along at least 80%, in particular at least 90% of the length of the cylinder 54, ie in the axial direction of the cylinder 54.

[0093] In the circumferential direction around the axis of the cylinder 54, the microporous surface 62 has, for example, an extent such that it covers at least 80%, in particular at least 90% of the extent of the sheet 58 in the circumferential direction.

[0094] The outer surface 56 of the cylinder 54 is designed such that the porous surface 62 is provided in those sections against which the film web 12 would rest if the film web 12 were clamped into the feed device 18.

[0095] The cylinder 54 also has a compressed air connection 64 which is in fluidic contact with the interior of the cylinder 54.

[0096] The compressed air connection 64 is fluidically connected to the compressed air source 20, so that compressed air can be introduced into the interior of the cylinder 54 by means of the compressed air connection 64 in order to generate an overpressure in the cylinder 54.

[0097] By introducing compressed air into the cylinder 54, air flows out through the openings of the porous surface 62, so that the film web 12 passing through the porous surface 62 does not come into contact with the outer surface 56, but is moved on an air cushion.

[0098] In this way, damage such as scratches or defects in the film web 12 are avoided, thereby increasing the quality of the film web 12 and reducing waste. Furthermore, no complex alignment of the rollers is necessary, since the air cushion can compensate to a certain extent for any misalignment of the cylinders 54 relative to each other and to the contact roller 42.

[0099] Just like the contact roller 42, the cylinder 54 of the tensioner 38 is also mounted for linear movement relative to the feed carriage 30 by means of at least one adjustment mechanism 44. In the illustrated embodiment, two adjustment mechanisms 44 are provided for fastening each of the end faces of the cylinder 54 of the tensioner 38.

[0100] Figure 5 shows the fastening of the cylinder 54 of the tensioner 38 by means of two adjustment mechanisms 44 as an example, and Figure 6 one of the adjustment mechanisms 44 in detail.

[0101] The contact roller 42 is similarly attached to the feed carriage 30 by means of one or two adjustment mechanisms 44 of the contactor 36.

[0102] The adjustment mechanism 44 has an adjustment rail 46, an adjustment slide 48 and an adjustment actuator 50, wherein the adjustment rail 46 is fixedly connected to the feed rail 32 and the cylinder 54 is fastened to the adjustment slide 48.

[0103] The adjustment slide 48 is mounted linearly on the adjustment rail 46 so that the cylinder 54 can be moved linearly relative to the feed slide 30.

[0104] In the illustrated embodiment, the adjustment mechanism 44 is designed as an air bearing. For this purpose, the adjustment rail 46 and / or the adjustment carriage 48, for example, has a plurality of air outlet openings, so that an air bearing can be provided between the adjustment carriage 48 and the adjustment rail 46. For this purpose, the adjustment carriage 48 or the adjustment rail 46 are connected to the compressed air source 20, for example, via a compressed air connection 52.

[0105] However, it is also conceivable that the adjustment mechanisms 44 provide a hydrostatic bearing.

[0106] The cylinder 54 of the tensioner 38 is attached to each of its end faces with one of the adjustment slides 48 of one of the two adjustment mechanisms 44.

[0107] The adjustment actuator 50 is connected to the adjustable slide 48 and is configured to move the adjustment slide 48 linearly. The adjustment actuator 50 is, for example, an electric motor or a piezo actuator.

[0108] The adjustment actuator 50 is connected to the control device 22 for transmitting data and / or control commands, for example wirelessly or wired.

[0109] It is conceivable that the two adjustment mechanisms 44 have a common adjustment actuator 50.

[0110] The statements made regarding the fastening of the cylinder 54 of the tensioner 38 apply equally to the contact roller 42 of the contactor 36.

[0111] The entire feed carriage 30 together with the contactor 36, the tensioner 38 and the deflectors 40 can also be moved linearly relative to the winding device 16, namely towards the winding device 16 or away from the winding device 16.

[0112] For example, the feed rail 32 and / or the feed carriage 30 has air outlet openings so that - as described for the adjustment mechanisms 44 - an air bearing is provided for the feed carriage 30.

[0113] For this purpose, the feed rail 32 or the feed carriage 30 are fluidically connected to the compressed air source 20.

[0114] However, it is also conceivable here that the feed rail 32 and the feed carriage 30 represent a hydrostatic bearing.

[0115] To move the feed carriage 30, the feed actuator 34 is provided, which can move the feed carriage 30 linearly.

[0116] The linear movement of the feed carriage 30 runs parallel to the linear movements of the adjustment mechanisms 44.

[0117] The feed actuator 34, like the adjustment actuators 50, is connected to the control device 22 for transmitting data and / or control commands, for example wirelessly or wired.

[0118] During operation of the film winding device 10, the process is carried out which is indicated by the double arrows in Figure 1 is illustrated.

[0119] The control device 22 is designed such that it can carry out the method.

[0120] The control device 22 controls the feed actuator 34, the adjustment actuator 50 of the tensioner 38 and / or the adjustment actuator 50 of the contactor 36 in order to move the cylinder 54 of the tensioner 38, the contact roller 42 of the contactor 36 or, by moving the entire feed carriage 30, simultaneously the cylinder 54 of the tensioner 38 and the contact roller 42 of the contactor 36 linearly towards the winding device 16 or away from the winding device 16 and thus also towards or away from the winding tube 24 or the film bale 28 located thereon.

[0121] The actuators 34, 50 are controlled in such a way that the film web 12 is subjected to a specific, in particular a predetermined, film tension by means of the cylinder 54 of the tensioner 38. The tensioner 38 therefore applies the specific film tension to the film web 12 and performs the function that a dancer roller fulfills in the prior art.

[0122] In addition, the position of the contact roller 42 of the contactor 36 is adjusted by the control device 22 such that the contact roller 42 bears against the winding tube 24 or the film bale 28 located thereon with a predetermined contact pressure.

[0123] By using cylinders 54, which are lighter than comparable rollers, the weight of the tensioner 38 and the feed carriage 30, including their superstructures, is reduced, enabling more dynamic control of the film tension of the film web 12. Furthermore, the cylinders 54 do not rotate because the film web 12 slides on the air cushion. Therefore, the film web 12 does not have to overcome the inertia of the roller due to the friction created between the film web 12 and a roller in order to set it in rotation. The film tension can thus be adjusted more dynamically, further improving the quality of the film produced.

[0124] In Figure 7 A second embodiment of the film winding device 10 is shown, which essentially corresponds to the first embodiment. Therefore, only the differences will be described below. Identical and functionally identical parts are provided with the same reference numerals.

[0125] The film winding device 10 of the second embodiment has only one deflector 40, namely the first deflector 40, which is arranged in front of the tensioner 38 with respect to the running direction of the film web 12.

[0126] The film web 12 thus runs from the tensioner 38, more precisely the cylinder 54 of the tensioner 38, to the contactor 36, more precisely the contact roller 42. By omitting the second deflector 40, the complexity of the feed device 18 is reduced and the weight is further reduced, which enables an even more dynamic adjustment of the contact pressure.

Claims

1. A film winding device for winding a film web (12) into a film bale (28), in particular a film web (12) made of thin film, comprising a winding device (16) and a feed device (18), wherein the winding device (16) has at least one winding core (24) and is designed to wind a film bale (28) on the winding core (24), wherein the feed device (18) has a feed carriage (30), a contactor (36) and at least one tensioner (38), wherein the contactor (36) is fastened to the feed carriage (30) and is arranged adjacent to the winding core (24) in such a way that the contactor (36) can guide the film web (12) to the winding core (24) or to the film bale (28) on the winding core (24), wherein the tensioner (38) is fastened to the feed carriage (30) and the tensioner (38) is arranged in the running direction of the film web (12) is arranged in front of the contactor (36) in such a way thatthat the tensioner (38) can adjust a film tension of the film web (12), wherein the tensioner (38) has a cylinder (54) with a lateral surface (56), wherein the cylinder (54) has a curve (58) in cross section and the lateral surface (56) has a microporous surface (62) at least in the region of the curve (58).

2. Film winding device according to claim 1, characterized in that the arc (58) corresponds to an angle of at least 90°, in particular at least 180°, in particular at least 200°.

3. Film winding device according to claim 1 or 2, characterized in that the microporous surface (62) has a plurality of openings which have a diameter of less than 900 µm, in particular less than 500 µm.

4. Film winding device according to one of the preceding claims, characterized in thatthe feed device (18) has at least one deflector (40) which is fastened to the feed carriage (30) and which is arranged in front of the tensioner (38) in the running direction of the film web (12) or between the tensioner (38) and the contactor (36) in the running direction of the film web (12), wherein the at least one deflector (40) has a cylinder (54) with a jacket surface (56), wherein the cylinder (54) has an arc (58) in cross section and the jacket surface (56) has a microporous surface (62) at least in the region of the arc (58).

5. Film winding device according to one of the preceding claims, characterized in that the cylinder (54) of the tensioner (38) and / or the deflector (40) has a compressed air connection (52) by means of which compressed air can be introduced into the interior of the cylinder (54).

6. Film winding device according to one of the preceding claims, characterized in thatthe thickness of the film web (12) is less than 10 µm, in particular less than 5 µm.

7. Film winding device according to one of the preceding claims, characterized in that the contactor (36) has a contact roller (42), in particular wherein the contactor (36) has at least one adjustment mechanism (44) with an adjustment rail (46) and an adjustment carriage (48), wherein the contact roller (42) is movably attached to the feed carriage (30) by means of the at least one adjustment mechanism (44), in particular linearly movable.

8. Film winding device according to one of the preceding claims, characterized in that the tensioner (38) has at least one adjustment mechanism (44) with an adjustment rail (46) and an adjustment slide (48), wherein the cylinder (54) is movably attached to the feed slide (30) by means of the at least one adjustment mechanism (44), in particular linearly movable.

9. Film winding device according to claim 7 or 8, characterized in that the adjustment rail (46) and / or the adjustment slide (48) has air outlet openings such that an air bearing can be provided for the adjustment slide (48).

10. Film winding device according to one of claims 7 to 9, characterized in that the at least one adjustment mechanism (44) has at least one adjustment actuator (50) which is connected to the adjustment slide (48) and which is configured to move the adjustment slide (48) linearly.

11. Film winding device according to one of claims 7 to 10, characterized in that the feed device (18) has at least one feed rail (32) for the feed carriage (30), in particular wherein the feed rail (32) and / or the feed carriage (30) has air outlet openings such that an air bearing can be provided for the feed carriage (30).

12. Film winding device according to one of the preceding claims, characterized in thatthe feed device (18) has at least one feed actuator (34) which is connected to the feed carriage (30) and which is designed to move the feed carriage (30) linearly.

13. Film winding device according to one of the preceding claims, characterized in that the film winding device (10) has a control device (22) which is designed to control the feed device (18) in such a way that the contactor (36), in particular the contact roller (42), rests with a predetermined contact pressure on the winding sleeve (24) or on the film bale (28) on the winding sleeve (24), in particular by controlling the feed actuator (34) and / or the adjustment actuator (50) of the contactor (36), and / or to control it in such a way that the tensioner (38), in particular the cylinder (54) of the tensioner (38), applies a certain film tension to the film web (12), in particular by controlling the adjustment actuator (50) of the tensioner (38).

14. Film manufacturing plant with at least one film stretching plant (110) and a film winding device (10) according to one of the preceding claims.

15. Method for winding up a film web (12), in particular a film web made of battery separator film, by means of a film winding device (10) according to one of claims 1 to 13 and / or a film production plant (100) according to claim 14, in particular wherein the contactor (36), in particular the contact roller (42), bears against the winding sleeve (24) or the film bale (28) on the winding sleeve (24) with a predetermined contact pressure, and / or a specific film tension is applied to the film web (12) by the tensioner (38), in particular the cylinder (54).

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