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

Abstract

A film winding device (10) for winding a film web (12) into a film bundle (28) is shown, comprising a winding device (16) and a feeding device (18). The feed device (18) comprises a feed slide (30), a contactor (36) and at least one tensioner (38), where the tensioner (38) is attached to the feed slide (30) and is located in front of the contactor (36) such that the tensioner (38) can set a film tension of the film web (12). The tensioner (38) comprises a cylinder (54), where the cylinder (54) comprises a microporous surface (62) at least in the region of an arc (58). In addition, a film production system (100) and a method for winding a film web (12) are shown.

Description

Field of the Invention

[0001] The present invention relates to a film winding device, a film production system, and a method for winding a film web. Background Art

[0002] A film production system is used to produce a film web from a plastic melt having specific material properties that can be used for a particular application. The film production system simultaneously includes a film stretching unit that includes longitudinal and / or transverse stretching zones.

[0003] The linear speed of such a film stretching unit continuously increases. In this case, one of the challenges is to wind the final product, i.e., the film web.

[0004] Film winding devices are known for this purpose, which wind the produced film web. When winding, it is important to ensure that there are no wrinkles in the film web so that the individual layers can be more easily separated from each other later. This is achieved by keeping the film tension as constant as possible during winding.

[0005] Depending on the type of film to be produced, specific production line parameters still have to be observed or achieved. The production of ultra-thin films or separator films (e.g., battery separator films (BSF)) has very high requirements. In contrast to films made of, for example, PET or PP, only a low film tension can be applied when producing ultra-thin films such as BSF.

[0006] However, this causes some problems because, in the case of low film tension, the film winding device requires a high dynamic performance to compensate for changes in film tension. Additionally, the setup of known film winding devices is extremely complex because the used reels and rollers must be precisely aligned with each other. Summary of the Invention

[0007] Accordingly, it is an object of the present invention to provide a film winding device, a film production system, and a method for winding a film web that can ensure a film tension as low as possible and have a simple setup.

[0008] This object is achieved by a film winding device for winding a film web, in particular a film web made of an ultrathin film, into a film bundle. The film winding device includes a winding device and a feeding device. The winding device includes at least one winding core and is configured to wind the film bundle onto the winding core. The feeding device includes a feeding slider, a contactor, and at least one tensioner. The contactor is attached to the feeding slider and positioned adjacent to the winding core such that the contactor can guide the film web onto the winding core or the film bundle on the winding core. The tensioner is attached to the feeding slider and is located in front of the contactor along the traveling direction of the film web such that the tensioner can set the film tension of the film web. The tensioner includes a cylinder body having an outer peripheral surface. The cylinder body includes an arc in cross-section and the outer peripheral surface includes at least a microporous surface in the region of the arc.

[0009] By using the cylinder body as the tensioner, due to the cylinder body and the microporous surface, the tensioner no longer needs to be driven to rotate by the film web and thus has a lower inertia, enabling more dynamic control of the film tension.

[0010] For example, the cylinder body is at least partially hollow, especially completely hollow.

[0011] For example, the feeding device is located in front of the winding device along the traveling direction of the film web. In particular, the tensioner guides the film web to the contactor.

[0012] In one aspect, the feeding slider is linearly movable relative to the winding device towards and away from the winding device. It is also conceivable that the feeding slider is not movable relative to the winding device.

[0013] The length of the contactor (especially the length of the contact roller) and the length of the cylinder body at least correspond to the width of the film web. The width of the film web is, for example, between 1.5 m and 15 m, for example, 6.2 m, 10.4 m, or 12 m.

[0014] It is conceivable that the winding device includes two or more winding cores. The film web is always only guided to one of these winding cores and the film bundle is wound on this winding core.

[0015] By means of the film winding device according to the invention, the film production system according to the invention, and the method according to the invention, uniaxially or biaxially stretched ultrathin films, in particular electronic isolation films (BSF), PP capacitor films, or PET capacitor films, and diaphragms, such as PTFE diaphragms (polytetrafluoroethylene), can be produced and wound.

[0016] By means of the film winding device according to the invention, the film production system according to the invention, and the method according to the invention, thicker films can also be produced.

[0017] The ultra-thin film is understood to mean, for example, a film having a thickness of less than 10 μm, particularly less than 5 μm. In this sense, the BSF is also an ultra-thin film.

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

[0019] The film tension that can be obtained by the film winding device according to the present invention is in the range of 1 N / m to 200 N / m, particularly in the range of 5 N / m to 15 N / m.

[0020] For example, due to the viscoelasticity of the battery separator film, a relatively high contact force of a contact roller cannot be used for the film bundle (wound bundle) and the winding core. For example, for the winding of the BSF, the contact force 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 wind the film web, for example, at a speed in the range of 40 m / min to 350 m / min, particularly at a speed of 150 m / min.

[0022] The arc is particularly a circular arc. However, the arc can also be based on a geometric shape other than a circle. For example, the arc can be elliptical or trochoidal.

[0023] In one embodiment, the arc corresponds to an angle of at least 90°, particularly at least 180°, especially at least 200°, through which the winding of the film web on the cylinder is larger, and thus the stress on the film web is smaller in this way.

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

[0025] The cross-section of the cylinder of the tensioner and / or the cross-section of the cylinder of the deflector is, for example, a circular sector having a circular radius and an arc.

[0026] In one embodiment, the microporous surface includes a plurality of openings having a diameter of less than 900 μm, particularly less than 500 μm, thereby achieving a particularly uniform air buffer.

[0027] The openings are particularly uniformly distributed on the microporous surface.

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

[0029] In the circumferential direction, the microporous surface extends, for example, along at least 80%, particularly at least 90%, of the outer peripheral length of the arc.

[0030] In an embodiment of the present invention, the feeding device includes at least one deflector, which is attached to the feeding slider and is located in front of the tensioner along the traveling direction or between the tensioner and the contactor along the traveling direction of the film web, wherein the at least one deflector includes a cylinder body having an outer peripheral surface, and the cylinder body has an arc in cross-section and the outer peripheral surface includes a microporous surface at least in the region of the arc. In this way, the traveling path of the film web can be selected more freely.

[0031] The at least one deflector is, for example, immovably attached to the feeding slider.

[0032] For example, the feeding device includes at least two deflectors, wherein one of the deflectors is located in front of the tensioner along the traveling direction of the film web, and the other of the deflectors is located between the tensioner and the contactor along the traveling direction of the film web.

[0033] In an embodiment, the cylinder body of the tensioner and / or the cylinder body of the deflector includes a compressed air connection member through which compressed air can be introduced into the interior of the cylinder body, so that the supply of compressed air to the cylinder body can be made flexibly.

[0034] For example, the compressed air source of the film winding device or the film production system is connected to the compressed air connection member so that the compressed air source generates overpressure in the interior of the cylinder body.

[0035] In an embodiment, the thickness of the film web is less than 10 μm, particularly less than 5 μm. Therefore, ultra-thin films can also be wound.

[0036] In order to accurately ensure the desired contact pressure, the contactor may include a contact roller.

[0037] In an embodiment, the contactor includes at least one adjusting mechanism, which includes an adjusting slider and an adjustable slider, wherein the contact roller is movably, particularly linearly movably, attached to the feeding slider through the at least one adjusting mechanism, so that the contact roller can be moved very dynamically, and thus the contact pressure can also be set very dynamically.

[0038] The traveling direction of the adjusting mechanism is, for example, parallel to the traveling direction of the feeding slider, and / or the contact roller is attached to the feeding slider.

[0039] In an embodiment, the tensioner includes at least one adjusting mechanism, which includes an adjusting track and an adjusting slider, wherein the cylinder body is movably, particularly linearly movably, attached to the feeding slider through the at least one adjusting mechanism. In this way, the film tension can be set particularly accurately.

[0040] The travel direction of the adjustment mechanism is in particular parallel to the travel direction of the feed slider.

[0041] For example, the adjustment track and / or the adjustable slider include air outlet openings such that an air bearing can be provided for the adjustable slider. In particular, the adjustment track and / or the adjustable slider can be connected to a compressed air source.

[0042] It is conceivable that the adjustment track and the adjustable slider provide a hydrostatic bearing.

[0043] To further reduce the mass to be moved, the tensioner and / or the contactor can include two adjustment mechanisms, wherein each end face of the barrel or the contact roller is respectively attached to one of the adjustment mechanisms.

[0044] To perform the setting particularly precisely, the at least one adjustment mechanism can include at least one adjustment actuator that is connected to the adjustable slider and configured to linearly move the adjustable slider.

[0045] It is conceivable that the adjustment mechanism has a common adjustment actuator.

[0046] In an embodiment of the present invention, the feeding device includes at least one feeding track for the feed slider, in particular wherein the feeding track and / or the feed slider include air outlet openings such that an air bearing can be provided for the feed slider, so that the contactor can slide through a larger area in order to take into account the increasing film bale on the film core.

[0047] The feeding track and / or the feed slider are in particular connected to a compressed air source.

[0048] It is conceivable that the feeding track and the feed slider form a hydrostatic bearing.

[0049] To perform the setting particularly precisely, the feeding device includes at least one feeding actuator that is connected to the feed slider and configured to linearly move the feed slider.

[0050] In an embodiment, the film winding device includes a control device that is designed to control the feeding device such that, in particular by controlling the feeding actuator and / or the adjustment actuator of the contactor, the contactor, in particular the contact roller, abuts against the winding core or against the film bale on the winding core with a predetermined contact pressure, and / or the control device is designed to control the feeding device such that, in particular by controlling the adjustment actuator of the tensioner, the tensioner, in particular the barrel of the tensioner, exerts a specific film tension on the film web. In this way, the contact pressure and / or the film tension can be controlled.

[0051] The object is also achieved by means of a film production system which comprises at least one film stretching unit 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] Moreover, the object is also achieved by a method of winding a film web, in particular a film web made of battery separator film, by means of the aforementioned film winding device and / or the aforementioned film production system, in particular in which a contactor, in particular a contact roller, bears against the winding core or against a film bale on the winding core with a predetermined contact pressure, and / or a specific film tension is applied to the film web by means of a tensioner, in particular a cylinder.

[0054] The features and advantages discussed for the film winding device and / or the film production system apply equally to the method and vice versa. Description of the Drawings

[0055] Additional features and advantages of the invention are found in the following description and in the attached drawings. In the drawings:

[0056] Figure 1 A film production system according to an embodiment of the invention is shown schematically, said film production system comprising a film winding device according to an embodiment of the invention,

[0057] Figure 2 Shows according to Figure 1 A schematic view of the film winding device,

[0058] Figure 3 And Figure 4 The components for guiding the film web of the film winding device are shown in side view and perspective view according to Figure 2 Of,

[0059] Figure 5 Shows according to Figure 2 A schematic representation of the tensioner of the film winding device,

[0060] Figure 6 Shows according to Figure 5 An enlarged view of one of the adjusting mechanisms, and

[0061] Figure 7 Shows a second embodiment of the film winding device according to the invention. Detailed Description

[0062] Figure 1Fig. 1 shows a film production system 100 including a film winding device 10 and a film stretching unit 110 according to the present invention. The film stretching unit 110 can be designed as a machine direction orienter, or a transverse direction orienter, or a sequential stretching unit including a longitudinal stretching stage and a transverse stretching stage, or a simultaneous stretching unit.

[0063] The film stretching unit 110 is used to produce a plastic film web, which is simply referred to as the film web 12 within the scope of the present disclosure. For this purpose, the film stretching unit 110 is divided into different regions 110a, 110b, 110c, 110d and 110e. However, not all of these regions 110a, 110b, 110c, 110d and 110e need to be present.

[0064] In each of the regions 110a to 110e, the film web 12 is exposed to different temperatures in order to generate or set certain film properties. The first region 110a is also called the preheating region. The second region 110b is called the stretching region, while the third region 110c is called another heating region. The fourth region 110d is also called the intermediate region, and the fifth region 110e is called the cooling region. In principle, there can be fewer or additional intermediate regions between the regions 110a to 110e to ensure the separation of the regions 110a to 110e, so that the influence of each region 110a to 110e on each other is less (air flows from one region 110a to 110e to another region). By using the film stretching unit 110, a film web 12 with a width greater than 2m, 3m, 4m, 5m, 6m, 7m, 8m, 9m, 10m, 11m, 12m, 13m or greater than 14m can be produced, but for example less than 15m, 14m, 13m, 12m, 11m, 10m, 9m, 8m, 7m, 6m, 5m, 4m or less than 3m.

[0065] For example, the processing width of the film stretching unit 110 and the film winding device 10, that is, the width of the film web 12, is equal to 6.2m, 10.4m or 12m.

[0066] The film stretching unit 110 includes an entry region 111, where the film to be stretched can be fed into the film stretching unit 110 at the entry region 111 of the film stretching unit. The stretched film web 12 exits at the end of the film stretching unit 110, so as to exit at its exit region 112. The exit region 112 of the film stretching unit 110 is connected to the film entry region 14 of the film winding device 10 according to the present invention.

[0067] As initially explained, different types of films should be wound in different ways, because only in this way can it be ensured that no wrinkles occur during winding and that sufficient air is introduced between the individual layers so that the film web 12 can be unwound without any difficulties in subsequent processing steps. The winding method according to the invention also ensures that the film web 12 is not torn.

[0068] 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.

[0069] As initially explained, the winding of battery separator films requires particularly high demands. The winding can only be carried out with low contact forces and low film tensions.

[0070] In Figure 2 a film winding device 10 is schematically shown.

[0071] The film winding device 10 includes a winding device 16 and a feeding device 18.

[0072] It is also conceivable that the film winding device 10 includes a compressed air source 20, such as an air compressor. The compressed air source 20 can also be designed as one or more connectors connected to a central compressed air supply device, such as the central compressed air supply device of a film production system 100.

[0073] The film winding device 10 also includes a control device 22, which controls the feeding device 18, the winding device 16 and the compressed air source 20. For example, the control device 22 can be designed separately or as part of the control device of the film production system 100.

[0074] The feeding device 18 is located in front of the winding device 16 along the travel direction of the film web 12. The feeding device 18 thus receives the film web 12 through the film inlet area 14 and transfers the film web 12 to the winding device 16.

[0075] The winding device 16 includes at least one winding core 24, and in the illustrated embodiment, there are two winding cores 24.

[0076] The winding cores 24 can all rotate about their central axes here; in particular, they are driven.

[0077] The winding cores 24 are arranged together on a rotatable base body of the winding device 16, and through the rotatable base body, one of the winding cores 24 can be brought into the winding position ( Figure 2the position of the left winding core among the two winding cores 2). In the winding position, the corresponding winding core 24 can receive and wind the film web 12 from the feeding device 18, so that a film bundle 28 is formed on the winding core 24.

[0078] In the illustrated embodiment, the feeding device 18 includes a feeding slider 30, at least one feeding rail 32, a feeding actuator 34, a contactor 36, a tensioner 38, and two deflectors 40.

[0079] The contactor 36, the tensioner 38, and the two deflectors 40 are attached to the feeding slider 30.

[0080] The two deflectors 40 are fixedly attached to the feeding slider 30 and thus immovable.

[0081] The contactor 36, the tensioner 38, and the two deflectors 40 guide the film web 12 to the winding device 16 and are Figure 3 and Figure 4 shown independently.

[0082] Starting from the film entry area 14, along the traveling direction of the film web 12, the film web 12 initially travels from the film entry area 14 to the first deflector among the deflectors 40 and is deflected there towards the tensioner 38.

[0083] At the tensioner 38, the film web 12 is further deflected and then travels to the second deflector 40, which is located between the tensioner 38 and the contactor 36.

[0084] At the second deflector 40, the film is guided to the contactor 38 and the contactor feeds the film web 12 to the winding device 16. More specifically, the contactor 36 guides the film web 12 onto the winding core 24 or onto the film bundle 28 that has been formed at the winding core 24. The contactor 36 is thus positioned adjacent to the winding core 24.

[0085] The contactor 36 includes a contact roller 42 and an adjustment mechanism 44. The contact roller 42 is attached to the feeding slider 30 in a linearly movable manner by the adjustment mechanism 44.

[0086] In the illustrated embodiment, neither the tensioner 38 nor the two deflectors 40 include rollers, but each tensioner and deflector has a cylinder 54, which are all hollow and non-rotatable.

[0087] Not only the length of the cylinder 54 of the tensioner 38 but also the length of the cylinder 54 of the deflector 40 (transverse to the traveling direction of the film web) is greater than the width of the film web 12.

[0088] For example, the contact rollers 42 and the cylinders 54 of both the tensioner 38 and the deflector 40 have the same length in a direction transverse to the direction of travel of the film web 12.

[0089] Each of the cylinders 54 has a non-circular outer peripheral surface 56. Unless otherwise stated, the following embodiments apply specifically to each of the cylinders 54 of both the tensioner 38 and the deflector 40.

[0090] The cross-section of the cylinder 54 at least includes an arc 58, that is, a section of the outer peripheral surface 56 that depicts an arc. For example, the arc 58 is a circular arc. However, the arc 58 can have another shape, for example, elliptical or conic spiral.

[0091] In the illustrated embodiment, the cross-section of the cylinder 54 is a circular sector having an arc 58 and two circular radii 60 that extend towards the center point of the circle at the ends of the arc 58.

[0092] The angle corresponding to the angle of the arc 58 is enclosed between the circular radii 60.

[0093] In the illustrated embodiment, the angle of the arc 58 of the cylinder 54 corresponding to the tensioner 38 is greater than 180°, particularly greater than 200°.

[0094] For example, the angle corresponding to the arc 58 of the cylinder 54 of the first deflector 40 is also greater than 180°, particularly greater than 200°.

[0095] The angle corresponding to the arc 58 of the cylinder 54 of the second deflector 40 is greater than 180°, particularly greater than 90°.

[0096] The outer peripheral surface 56 is a microporous surface 62 in the region of the arc 58, such that the outer peripheral surface 56 includes a plurality of openings that extend through the outer peripheral surface 56. For example, the diameter of each opening is less than 900 μm, particularly less than 500 μm.

[0097] The openings are particularly evenly distributed on the microporous surface 62, for example, in the form of a grid or lattice.

[0098] For example, the microporous surface 62 extends along at least 80%, particularly at least 90% of the length of the cylinder 54, that is, along the axial direction of the cylinder 54.

[0099] Along the circumferential direction around the axis of the cylinder 56, the extent of the microporous surface 62 is such that it covers at least 80%, particularly at least 90% of the extent of the arc 58 in the circumferential direction.

[0100] The outer peripheral surface 56 of the cylinder 54 is designed such that if the film web 12 has been clamped in the feeding device 18, the microporous surface 62 is provided in those sections on which the film web 12 will rest.

[0101] The cylinder body 54 further includes a compressed air connector 64, and the air connector is in fluid contact with the interior of the cylinder body 54.

[0102] The compressed air connector 64 is fluidly connected to a compressed air source 20 so that compressed air can be introduced into the interior of the cylinder body 54 through the compressed air connector 64 to generate overpressure in the cylinder body 54.

[0103] By introducing compressed air into the cylinder body 54, the air flows outwards through the openings of the microporous surface 62, so that the film web 12 passing through the microporous surface 62 does not contact the outer peripheral surface 56, but moves on the air buffer.

[0104] In this way, damage such as scratches or defects is avoided on the film web 12, thereby improving the quality of the film web 12 and reducing the scrap rate. In addition, since the air buffer can compensate for misalignment between the cylinder bodies 54 and between the cylinder body and the contact roller 42 to a certain extent, complex alignment of the rollers is not required.

[0105] Similarly, the contact roller 42 is also attached to the cylinder body 54 of the tensioner 38 by means of at least one adjusting mechanism 44 so as to be linearly movable relative to the feed slider 30. In the illustrated embodiment, two adjusting mechanisms 44 are provided for each end face of the cylinder body 54 attached to the tensioner 38.

[0106] Figure 5 Exemplarily shown is the attachment of the cylinder body 54 of the tensioner 38 by two adjusting mechanisms 44. Figure 6 One of the adjusting mechanisms 44 is shown in detail.

[0107] The contact roller 42 is attached to the feed slider 30 in the same manner by one or two adjusting mechanisms 44 of the contactor 36.

[0108] The adjusting mechanism 44 includes an adjusting track 46, an adjustable slider 48 and an adjusting actuator 50, wherein the adjusting track 46 is fixedly connected to the feed track 32, and the cylinder body 54 is attached to the adjustable slider 48.

[0109] The adjustable slider 48 is linearly mounted on the adjusting track 46 by means of bearings so that the cylinder body 54 can be linearly moved relative to the feed slider 30.

[0110] In the illustrated embodiment, the adjusting mechanism 44 is designed as an air bearing. For this purpose, the adjusting track 46 and / or the adjustable slide 48 include, for example, a plurality of air outlet openings such that the air bearing can be provided between the adjustable slide 48 and the adjusting track 46. For this purpose, the adjustable slide 48 or the adjusting track 46 is connected to a compressed air source 20, for example via a compressed air connection 52.

[0111] However, it is conceivable that the adjusting mechanism 44 provides a hydrostatic bearing.

[0112] The cylinder 54 of the tensioner 38 is attached to one of the adjustable slides 48 of one of the two adjusting mechanisms 44 on each of its end faces.

[0113] The adjusting actuator 50 is connected to the adjustable slide 48 and is configured to linearly move the adjustable slide 48. The adjusting actuator 50 is, for example, an electric motor or a piezoelectric actuator.

[0114] The adjusting actuator 50 is connected to the control device 22 for transmitting data and / or control commands, for example wirelessly or via a wired connection.

[0115] It is conceivable that the two adjusting mechanisms 44 have a common adjusting actuator 50.

[0116] The design of the attachment of the cylinder 54 of the tensioner 38 is similarly adapted to the contact roller 42 of the contactor 36.

[0117] Moreover, the entire feed slide 30, together with the contactor 36, the tensioner 38, and the deflector 40, can slide linearly relative to the winding device 16, i.e., slide towards or away from the winding device 16.

[0118] For example, the feed track 32 and / or the feed slide 30 include air outlet openings such that an air bearing is provided for the feed slide 30 as described for the adjusting mechanism 44. For this purpose, the feed track 32 and the feed slide 30 are fluidly connected to the compressed air source 20.

[0119] However, it is conceivable that the feed track 32 and the feed slide 30 constitute a hydrostatic bearing.

[0120] A feed actuator 34 is provided that can linearly move the feed slide 34 for moving the feed slide 30.

[0121] The linear movement of the feed slide 30 is parallel to the linear movement of the adjusting mechanism 44.

[0122] Just like the adjusting actuator 50, the feed actuator 34 is connected to the control device 22 for transmitting data and / or control commands, for example wirelessly or via a wired connection.

[0123] During operation of the film winding device 10, the method shown by the double arrow in Figure 1 is performed.

[0124] The control device 22 is configured such that it can perform this method.

[0125] The control device 22 controls the feed actuator 34, the adjusting actuator 50 of the tensioner 38, and / or the adjusting actuator 50 of the contactor 36 so as to move the drum 54 of the tensioner 38 and the contact roller 42 of the contactor 36, or by moving the entire feed slide 30 while linearly moving the drum 54 of the tensioner 38 and the contact roller 42 of the contactor 36 towards or away from the winding device 16, and thus also towards and away from the winding core 24 or the film bundle 28 located on the winding core.

[0126] The actuators 34, 50 are controlled in such a way that a specific film tension, in particular a predetermined film tension, is exerted on the film web 12 by the drum 54 of the tensioner 38. Thus, the tensioner 38 exerts a specific film tension on the film web 12 and assumes the function of a floating roller in the prior art.

[0127] Furthermore, the position of the contact roller 42 of the contactor 36 can be set by the control device 22 such that the contact roller 42 abuts against the winding core 24 or against the film bundle 28 located on the winding core with a predetermined contact pressure.

[0128] By using, for example, a drum 54 that is lighter than a similar roller, the weight of the tensioner 38 and the feed slide 30 together with the assembly is reduced, thus enabling more dynamic control of the film tension of the film web 12. Moreover, when the film web 12 is guided over an air buffer, the drum 54 does not rotate. Due to the friction formed between the film web 12 and the roller, the film web 12 does not have to first overcome the inertia of the roller to drive it to rotate. Therefore, the film tension can be set more dynamically and thus the quality of the produced film can be further improved.

[0129] In Figure 7 a second embodiment of the film winding device 10 is shown, which basically corresponds to the first embodiment. Therefore, only the differences will be described below. Identical and functionally equivalent components are provided with the same reference numerals.

[0130] The film winding device 10 of the second embodiment only includes one deflector 40, namely the first deflector 40, which is arranged in front of the tensioner 38 with respect to the traveling direction of the film web 12.

[0131] The film web 12 thus travels from the tensioner 38, more specifically from the cylinder 54 of the tensioner 38, to the contactor 36, more specifically to the contact roller 42. By omitting the second deflector 40, the complexity of the feed device 18 is reduced and the weight is further decreased, thereby enabling the contact pressure to be set more dynamically.

Claims

1. A film winding device for winding a film web (12), in particular a film web (12) made of an ultra-thin film, into a film bundle (28), the film winding device comprising a winding device (16) and a feeding device (18), in, The winding device (16) comprises at least one winding core (24) and is configured to wind a film bundle (28) on the winding core (24). The feeding device (18) comprises a feeding slide (30), a contactor (36) and at least one tensioner (38). wherein the contactor (36) is attached to the feed slide (30) and is positioned adjacent to the winding core (24) such that the contactor (36) is capable of guiding the film web (12) to the winding core (24) or to the film bundle (28) on the winding core (24), wherein the tensioner (38) is attached to the feed slide (30) and the tensioner (38) is located in front of the contactor (36) along the travel direction of the film web (12), so that the tensioner (38) can set the film tension of the film web (12), The tensioner (38) comprises a cylinder (54) having a peripheral surface (56), wherein the cylinder (54) has an arc (58) in cross section and the peripheral surface (56) comprises at least a microporous surface (62) in the region of the arc (58).

2. The 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°, especially at least 200°.

3. The film winding device according to claim 1 or 2, characterized in that: The microporous surface (62) comprises a plurality of openings, wherein the diameter of the plurality of openings is less than 900 μm, in particular less than 500 μm.

4. The film winding device according to any one of the preceding claims, characterized in that The feeding device (18) comprises at least one deflector (40) which is attached to the feeding slide (30) and is located in front of the tensioner (38) in the travel direction of the film web (12) or between the tensioner (38) and the contactor (36) in the travel direction of the film web (12), The at least one deflector (40) comprises a cylinder (54) having a peripheral surface (56), wherein the cylinder (54) has an arc (58) in cross section and the peripheral surface (56) comprises at least a microporous surface (62) in the region of the arc (58).

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

6. The film winding device according to any one of the preceding claims, characterized in that The film web (12) has a thickness of less than 10 μm, in particular less than 5 μm.

7. The film winding device according to any one of the preceding claims, characterized in that The contactor (36) comprises a contact roller (42), in particular, the contactor (36) comprises at least one adjustment mechanism (44), the adjustment mechanism comprising an adjustment rail (46) and an adjustable slide (48), wherein the contact roller (42) is movably, in particular linearly movably, attached to the feed slide (30) via the at least one adjustment mechanism (44).

8. The film winding device according to any one of the preceding claims, characterized in that The tensioner (38) comprises at least one adjustment mechanism (44), which comprises an adjustment rail (46) and an adjustable slide (48), wherein the cylinder (54) is movably, in particular linearly movably, attached to the feed slide (30) via the at least one adjustment mechanism (44).

9. The film winding device according to claim 7 or 8, characterized in that: The adjustment rail (46) and / or the adjustable slide (48) comprise air outlet openings, so that an air bearing can be provided for the adjustable slide (48).

10. The film winding device according to any one of claims 7 to 9, characterized in that: The at least one adjustment mechanism (44) includes at least one adjustment actuator (50) connected to the adjustable slide (48) and configured to cause linear movement of the adjustable slide (48).

11. The film winding device according to any one of claims 7 to 10, characterized in that: The feed device (18) comprises at least one feed track (32) for the feed slide (30), in particular wherein the feed track (32) and / or the feed slide (30) comprises an air outlet opening so that an air bearing can be provided for the feed slide (30).

12. The film winding device according to any one of the preceding claims, characterized in that The feeding device (18) comprises at least one feeding actuator (34) connected to the feeding slide (30) and configured to cause a linear movement of the feeding slide (30).

13. The film winding device according to any one of the preceding claims, characterized in that The film winding device (10) comprises a control device (22), which is designed to control the feeding device (18) so that, in particular through the control of the feeding actuator (34) and / or the adjusting actuator (50) of the contactor (36), the contactor (36), in particular the contact roller (42) abuts against the winding core (24) or against the film bundle (28) on the winding core (24) with a predetermined contact pressure, and / or the control device is designed to control the feeding device (18) so that, in particular through the control of the adjusting actuator (50) of the tensioner (38), the tensioner (38), in particular the cylinder (54) of the tensioner (38), applies a specific film tension on the film web (12).

14. A film production system comprising at least one film stretching unit (110) and a film winding device (10) according to any one of the preceding claims.

15. A method for winding a film web (12), in particular a film web made of a battery insulation film, by means of a film winding device (10) according to any one of claims 1 to 13 and / or a film production system (100) according to claim 14, in particular wherein: The contactor (36), in particular the contact roller (42), rests against the winding core (24) or against the film bundle (28) on the winding core (24) with a predetermined contact pressure and / or applies a specific film tension to the film web (12) via the tensioner (38), in particular the cylinder (54).

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