Thin film winding system, composite structure and use thereof for manufacturing thin films and diaphragms

Abstract

The invention relates to a film winding system (1) comprising a first winding station (4) which is configured in a winding position for winding a film web (2) into a film roll (5). A contact roller (6) is provided which is configured for guiding the film web (2) to the first winding station (4). An adjustment roller (8) is arranged upstream of the contact roller (6) in the direction of movement of the film web (2) and is configured for guiding the film web (2) to the contact roller (6) and for adjusting the film tension. A first adjustment device (10) is provided which is configured for moving the contact roller (6) in the direction of the winding station (4) or away from the winding station (4), whereby a specific contact pressure between the contact roller (6) and the film roll (5) can be adjusted. The first adjustment device (10) comprises a slide system or an adjustment shaft.

Description

Technical Field

[0001] This invention relates to a thin film winding system, a composite structure comprising a thin film stretching apparatus and such a thin film winding system, and the application of such a composite structure in the manufacture of biaxially stretched ultrathin films, particularly battery separators, PPK films (PP capacitor films) or PETK films (PET capacitor films), or films such as PTFE (polytetrafluoroethylene) films. PPK films and PETK films are preferably stretched by BO. The ultrathin films preferably have a thickness of less than 5 μm. Background Technology

[0002] Film stretching equipment is used to produce film webs from molten plastic, with specific material properties for specific purposes. Film stretching equipment includes stretching stages in the longitudinal and / or transverse directions. Equipment speeds are increasingly faster and today exceed 400 m / min. Even faster film stretching equipment should be available in the future. In this context, an important aspect is how to wind the completed primary product, the film web. For this purpose, a film winding system is provided, which winds the produced film web. However, it is important during winding that no wrinkles are pressed into the film web, so that the individual layers can be easily separated from each other later. The winding of the film web takes place at a winding station. This winding station includes a corresponding substrate around which the film web is wound. However, the film web is fed to the internally known winding station via contact rollers to ensure optimal orientation before winding.

[0003] Depending on the type of film to be manufactured, specific equipment parameters must also be followed or met. High requirements are placed on the manufacture of extremely thin films, such as battery separators. Unlike films made of, for example, PET or PP, extremely thin films, such as battery separators, require only a very small film tension during manufacturing. The film tension is in the range of 1 N / m to 200 N / m. Preferably, the film tension is in the range of 5 N / m to 15 N / m. Due to the viscoelastic properties of battery separators, high pressure clamping force cannot be achieved at the film bundle or winding sleeve by the contact rollers. Therefore, the clamping force should preferably be in the range of 0 N / m to 100 N / m. More preferably, the clamping force should be in the range of 1 N / m to 10 N / m. Otherwise, winding failures, such as film web expansion and contraction, may occur. This should be avoided.

[0004] The manufacture of battery separators has been described, for example, in DE102019112089 and DE102019119600, and their contents concerning the manufacture of battery separators are hereby adopted in this application.

[0005] In principle, it is difficult to adjust low film tension and especially low clamping force because the whole system is particularly slow and the film bundle is not an ideal circle. Summary of the Invention

[0006] Therefore, the objective of this invention is to provide a film winding system that can achieve the lowest possible film tension and the lowest possible clamping force between the contact roller and the film bundle.

[0007] This task is solved by a film winding system according to the present invention. The present invention describes a composite structure comprising a film stretching device and a film winding system, or a composite structure consisting of a film stretching device and a film winding system. The present invention describes an application of said composite structure for manufacturing and winding extremely thin films and sheets. Extended designs of the film winding system are described in this application.

[0008] This invention relates to a film winding system for a film stretching apparatus, the film winding system having the following features: a film entry area through which a film web to be wound is conveyed to the film winding system; a first winding workstation configured in a winding position for winding the film web into a film bundle; a contact roller and an adjusting roller, wherein the contact roller is arranged adjacent to the first winding workstation in the winding position and configured to guide the film web to the first winding workstation; the adjusting roller is arranged upstream of the contact roller along the direction of movement of the film web and configured to guide the film web to the contact roller and adjust the film tension; a first adjustment device configured to move the contact roller toward or away from the winding workstation, thereby adjusting a specific contact pressure between the contact roller and the film bundle; the first adjustment device includes a slider system or an adjusting shaft.

[0009] The film winding system includes a film entry area through which the film web to be wound is fed to the film winding system. A first winding station is also provided. The first winding station is configured in a winding position for winding the film web into a film bundle. Contact rollers and adjusting rollers are also provided. The contact rollers are arranged (directly) adjacent to the first winding station (when the first winding station is in the winding position) and are configured to guide the film web to the first winding station. The term "directly" is understood to mean that the contact rollers are in contact with the film bundle, or that only the film web wound on the film bundle extends between the contact rollers and the film bundle. However, a gap space is also formed between the contact rollers and the film bundle. This gap space is preferably less than 1000 mm, 900 mm, 800 mm, 700 mm, 600 mm, 500 mm, 400 mm, 300 mm, 200 mm, 100 mm, 50 mm, 30 mm, 20 mm, or less than 10 mm. An adjusting roller is arranged upstream of the contact roller along the direction of film web movement and is configured to guide the film web to the contact roller and adjust the film tension. The phrase "along the direction of film web movement" is understood to mean that a specific section of the film web passes the adjusting roller first and then immediately afterward, passing the contact roller. A first adjusting device is also provided, configured to move the contact roller toward or away from the winding station, thereby adjusting a specific contact pressure between the contact roller and the film bundle. Particularly advantageously, the adjusting device includes a slider system. The slider system can be, for example, an air bearing slider system or a hydrostatic bearing slider system. An air bearing slider system establishes an air film between the slider and the track, thereby allowing the slider to move relative to the track with negligible friction. Therefore, friction is minimized during the horizontal movement of the contact roller, and the contact roller can be positioned particularly accurately and sensitively. Alternatively, the contact roller can also be moved via an adjusting shaft. This allows for the movement of particularly large weights.

[0010] In one extended design of the thin film winding system, the air bearing slider system of the first adjustment device includes a first track and at least one first slider disposed on the first track. The first slider includes an air outlet pointing in the direction of the first track. The first slider also includes an air interface to deliver compressed air, which then exits from the air outlet, allowing the first slider to slide slidably on the first track.

[0011] In one extended design of the thin-film winding system, the first slider surrounds the first track from at least three sides. This achieves exceptionally high structural stability. It is also conceivable that the air outlets are aligned with the first track on more than one side. Alternatively, the air outlets could be aligned with three different sides of the first track. This achieves exceptionally good stabilization of the first slider.

[0012] In an extended design of the film winding system, the air bearing slider system of the first adjustment device includes a second track and at least one second slider arranged on the second track. The second slider includes an air outlet pointing towards the second track. The second slider includes an air interface for supplying compressed air. The compressed air then exits from the air outlet, allowing the second slider to slide slidably on the second track. The second track extends parallel to the first track. The second slider of the second track can, in principle, have the same characteristics as the first slider of the first track. The weight of the contact roller can be better distributed and the contact roller can be held more stably by using the second track with the second slider.

[0013] In an extended design of the film winding system, the air bearing slider system of the first adjustment device includes a third slider arranged on a first track. The third slider includes an air outlet pointing towards the first track. The third slider includes an air interface to deliver compressed air, which then exits from the air outlet, allowing the third slider to slide slidably on the first track. The first track has a continuous orientation or is divided into two spaced-apart tracks for the first and third sliders. The stability of the contact roller movement can be further improved by using two sliders that are preferably coaxially movable with each other.

[0014] In one extended design of the film winding system, the first adjustment device includes first and second radial air bearings. The contact roller includes first and second roller necks supported in the first and second radial air bearings or in first and second hydrostatic bearings (hydraulic mechanisms) in the regions of the first and second end sides. This further reduces friction during contact roller rotation. The contact roller is preferably solely subjected to rotational movement via a film web abutting against it. Therefore, in one embodiment, the use of an electric motor can be eliminated. In other embodiments, the contact roller can still be driven by an electric motor. This electric motor is either directly disposed at the contact roller or connected to the contact roller via a force transmission device, such as a chain. Rotation of the electric motor shaft then also causes rotation of the contact roller.

[0015] In one extended design of the film winding system, the first adjustment device includes a linear motor configured to move the contact roller toward or away from the first winding station via an air-bearing slider system or a hydrostatic bearing slider system. This linear motor, combined with the air-bearing slider system or the hydrostatic bearing slider system, allows for extremely precise positioning of the contact roller. Alternatively, the first adjustment device may include an electric motor configured to rotate a shaft, thereby enabling the contact roller to move toward or away from the first winding station.

[0016] In one extended design of the film winding system, a control device is provided. This control device is configured to operate a linear or electric motor of the first adjustment device, causing the contact roller to press against the film bundle with a predetermined clamping force. In principle, a corresponding pressure sensor for measuring the clamping pressure is also provided for this purpose.

[0017] In one extended design of the film winding system, a first guide roller is provided. The first guide roller is arranged upstream of the adjusting roller along the direction of film web movement. The first guide roller increases the winding degree (by which the film adheres to the adjusting roller), while simultaneously stabilizing the film web. "Winding degree" refers to the extent to which the film web covers the adjusting roller. The adjusting roller extends 360°. At a winding degree of 90°, the film web adheres to only one-quarter of the side surface of the adjusting roller, particularly the cylindrical type. At a winding degree of 180°, the film web adheres to half of the side surface of the adjusting roller, particularly the cylindrical type.

[0018] In one extended design of the film winding system, the distance between the first steering roller and the contact roller is smaller than the distance between the adjusting roller and the contact roller. This allows the film width to cover the winding degree of the adjusting roller by a winding degree greater than 120°, 130°, 140°, or greater than 150°.

[0019] In one extended design of the film winding system, the first guide roller is rotatably supported by a radial air bearing or a hydrostatic bearing. Due to the low friction between the guide roller and the radial air bearing or hydrostatic bearing, the first guide roller is preferably subjected to rotational motion solely by the film web itself, thus eliminating the need for an electric motor in one embodiment. In other embodiments, the first guide roller can still be operated by an electric motor. This electric motor is either directly located at the first guide roller or connected to the first guide roller via a force transmission device, such as a chain. Rotation of the electric motor shaft then also causes rotation of the first guide roller.

[0020] In one extended design of the film winding system, a second steering roller is provided. The second steering roller is arranged downstream of the adjusting roller and upstream of the contact roller along the direction of film web movement.

[0021] In an extended design of the film winding system, the second guide roller is also rotatably supported by radial air bearings or hydrostatic bearings. Due to the low friction between the guide roller and the radial air bearings or hydrostatic bearings, the second guide roller is preferably subjected to rotational motion solely by the film web itself, thus eliminating the need for a dedicated electric motor in one embodiment. In another embodiment, the second guide roller can still be operated by an electric motor. This electric motor is either directly located at the second guide roller or connected to it via a power transmission device, such as a chain. Rotation of the electric motor's shaft then causes rotation of the second guide roller.

[0022] In one extended design of the film winding system, a contact roller frame is provided. An air bearing slider system or a hydrostatic bearing slider system of the first adjusting device is arranged on this contact roller frame, thus allowing the contact roller to move relative to the contact roller frame. Alternatively, the contact roller frame is arranged on the air bearing slider system or the hydrostatic bearing slider system of the first adjusting device, wherein the contact roller is arranged on this contact roller frame, so that the contact roller and the contact roller frame can move together.

[0023] In one extended design of the film winding system, a first guide roller and / or a second guide roller and / or an adjusting roller are arranged on a contact roller carrier. If the contact roller carrier is moved by a first adjusting device, this also applies to the first and / or second guide rollers or adjusting rollers. This results in synchronized movement.

[0024] In one extended design of the film winding system, a base adjustment device is provided, comprising a base frame and an air-bearing slider system or a hydrostatic bearing slider system or an adjustment shaft. Contact rollers, adjusting rollers, and a first and / or second guide roller are arranged on the base frame. The base adjustment device is configured to move the contact rollers, adjusting rollers, first guide rollers, and / or second guide rollers toward or away from the winding station. In this configuration, both a first adjustment device and a higher-level base adjustment device are present, allowing for particularly precise adjustments.

[0025] In one extended design of the film winding system, a second adjustment device is provided, configured to move the adjusting roller toward or away from the contact roller, thereby enabling adjustment of a specific film tension. The second adjustment device includes an air bearing slider system, a hydrostatic bearing slider system, or an adjustment shaft. Particularly advantageously, the adjusting roller also moves with the air bearing slider system. Due to the low coefficient of friction, the film tension can be adjusted with extremely high precision.

[0026] In one extended design of the film winding system, the second adjustment device includes a linear motor or electric motor configured to move the adjustment roller toward or away from the contact roller via an air bearing slider system, a hydrostatic bearing slider system, or an adjustment shaft. Such a linear motor or electric motor allows for highly precise adjustment of position and force.

[0027] In one extended design of the film winding system, a control device is provided, which is configured to operate a linear motor or electric motor of a second adjustment device so that a predetermined film tension can be applied through the adjustment roller.

[0028] In one extended design of the film winding system, the adjusting roller is rotatably supported by radial air bearings or hydrostatic bearings. Due to the low friction between the adjusting roller and the radial air bearings or hydrostatic bearings, the adjusting roller is preferably subjected to rotational movement solely by the film web itself, thus eliminating the need for an electric motor in one embodiment. In another embodiment, the adjusting roller can be operated by an electric motor. This electric motor is either directly located at the adjusting roller or connected to the adjusting roller via a force transmission device, such as a chain. Rotation of the electric motor's shaft then also causes rotation of the adjusting roller.

[0029] In an extended design of the film winding system, a first winding station includes a substrate, which is capable of rotational motion, and around which a film web can be wound. A second winding station with a substrate is also present, wherein the substrate of the second winding station is capable of rotational motion, and around which a film web can be wound. The first winding station is configured to pivot from a winding position adjacent to the contact rollers into an unloading position, wherein the wound film bundle in the unloading position can be removed from the first winding station, and wherein the second winding station is configured to pivot from the unloading position into the winding position simultaneously. A cutting device is also present, configured to cut the film web across its width as the first winding station pivots toward the unloading position, wherein the second winding station is configured to further pivot into the winding position, so that the substrate of the second winding station immediately contacts the now-formed new beginning of the film web.

[0030] In another embodiment, the film winding system includes at least one discharge device. The discharge device is arranged in a region of the film web and configured to reduce charge on the film web and / or film bundle.

[0031] The discharge device preferably comprises a large number of curved / free-moving conductive metal strips (a type of metal wire) that can contact the thin film web. These metal strips are preferably distributed across the entire width or most of the width of the thin film web. Discharge conductors can also be used in principle. These discharge conductors are preferably spaced apart from the thin film web. The spacing is preferably less than 200 mm, 150 mm, 100 mm, 50 mm, 40 mm, 30 mm, 20 mm, 10 mm, or less than 5 mm. However, the spacing is preferably greater than 5 mm. An alternating electric field is applied at this discharge conductor. This alternating electric field involves a high voltage, thus deriving static charge.

[0032] The composite structure according to the invention, consisting of a film winding system and a film stretching device, particularly a sequential stretching device, a synchronous stretching device, or a battery separator stretching device (evaporation process or WET process) known in the art, allows the film winding system to be connected to the output area of ​​the film stretching device. The film stretching device includes an input area where the film can be fed to the device. Furthermore, the device includes different zones where the plastic film is heated and stretched into uniaxially or biaxially oriented film webs (e.g., via longitudinal stretching stages and / or transverse stretching stages or a furnace). The resulting film webs are then fed to the film winding system. In the WET process, the cast film contains a solvent (e.g., white oil), wherein the cast film is subjected to MD stretching and TD stretching (sequentially or synchronously). The stretched film is then introduced into a cleaning tank. In the cleaning tank, dichloromethane contained therein washes away the solvent (e.g., white oil). The film is then reintroduced into a TDO to be stretched again to a minimal degree or subjected to heat treatment (annealing). Next, the film is wound up.

[0033] The application of this composite structure allows for the fabrication and winding of extremely thin films, such as battery separators, PPK films, or PETK films, or films such as PTFE sheets. These films can also be wound to a thickness of less than 15 μm. Battery separators typically have a thickness in the range of 8 to 15 μm, and PPK films have a thickness of 2 to 6 μm. Attached Figure Description

[0034] Different embodiments of the invention will now be described, for example, with reference to the accompanying drawings. The same subject matter has the same reference numerals. In the corresponding drawings:

[0035] Figure 1 The composite structure consisting of a film winding system and a film stretching device is shown in detail.

[0036] Figure 2 An embodiment of a film winding system with an adjustment roller and a contact roller is shown in detail;

[0037] Figure 3 An embodiment of the thin film winding system is shown in detail, wherein the use of the first winding workstation and the second winding workstation is illustrated.

[0038] Figure 4 Another embodiment of a film winding system with an adjustment roller, a contact roller, and two steering rollers is shown in detail;

[0039] Figure 5 The spatial diagram shows in detail Figure 4 Another embodiment of the thin film winding system;

[0040] Figure 6 An embodiment of the air bearing slider system is shown in detail;

[0041] Figure 7 An embodiment of a radial air bearing is shown in detail;

[0042] Figure 8 An embodiment of the contact roller is shown in detail, wherein the contact roller is supported at a contact roller carrier, and the contact roller carrier is arranged on an air bearing slider system;

[0043] Figure 9 An embodiment of a film winding system is shown in detail, wherein the contact roller, the first and second guide rollers, and the adjusting roller are movable together via an air bearing slider system of a first adjusting device;

[0044] Figure 10 An embodiment of a film winding system is shown in detail, wherein the contact roller, the first steering roller, and the adjusting roller are movable together via an air bearing slider system of the first adjusting system;

[0045] Figure 11 An embodiment of a film winding system is shown in detail, wherein the contact roller, the first guide roller, the second guide roller, and the adjusting roller are arranged together on the base frame and can move together via the base adjusting device;

[0046] Figure 12 An embodiment of a film winding system is shown in detail, wherein the contact roller, the first steering roller, and the adjusting roller are arranged together on the base frame and can move together via the base adjusting device;

[0047] Figure 13 An embodiment of a film winding system is shown in detail, wherein a contact roller, a first guide roller, a second guide roller, and an adjusting roller are arranged together on a base frame and can move together via a base adjusting device, and wherein the film width has a winding angle of approximately 60° with respect to the contact roller; and

[0048] Figure 14An embodiment of a film winding system is shown in detail, wherein a contact roller, a first steering roller, a second steering roller, and an adjusting roller are arranged together on a base frame and can move together via a base adjusting device, and wherein the film width has a winding degree of approximately 180° with respect to the contact roller. Detailed Implementation

[0049] Figure 1 A composite structure comprising a film winding system 1 and a film stretching apparatus 110 according to the invention is shown. The film stretching apparatus 110 can be configured as a longitudinal stretching apparatus, a transverse stretching apparatus, a continuous stretching apparatus with longitudinal and transverse stretching stages, or a synchronous stretching apparatus. The film stretching apparatus 110 is used to manufacture a plastic film web 2, hereinafter also referred to as film web 2. For this purpose, the film stretching apparatus 110 is divided into different zones 110a, 110b, 110c, 110d, and 110e. Of course, not all of these zones 110a, 110b, 110c, 110d, and 110e must actually exist. In the different zones 110a to 110e, the film web 2 is subjected to different temperatures in order to generate or adjust certain film properties. The first zone 110a is also referred to herein as the preheating zone. The second zone 110b is called the stretching zone, and the third zone 110c is called the continued heating zone. The fourth zone 110d is also called the neutral zone, and the fifth zone 110e is called the cooling zone. In principle, fewer or additional neutral zones may exist between the various zones 110a to 110e to ensure separation of zones 110a to 110e, thereby reducing the mutual influence between the zones 110a to 110e (air flowing from one zone 110a to 110e to another). The film stretching apparatus 110 can produce film widths greater than 2 m, 3 m, 4 m, 5 m, 6 m, 7 m, 8 m, 9 m, 10 m, 11 m, or greater than 12 m, but preferably less than 13 m, 12 m, 11 m, 10 m, 9 m, 8 m, 7 m, 6 m, 5 m, 4 m, or less than 3 m.

[0050] The film stretching apparatus 110 includes an input region 111, through which the film to be stretched is fed into the film stretching apparatus 110. The stretched film web 2 exits at the end of the film stretching apparatus 110, i.e., at the output region 112. The output region 112 of the film stretching apparatus 110 is connected to the film entry region 3 of the film winding system 1 according to the invention.

[0051] In the next Figure 2 , 3 The structure of the thin film winding system 1 according to the invention is described in more detail in sections 4 and 5.

[0052] As explained at the beginning of this article, different film types should be wound differently because only by ensuring that the winding is wrinkle-free and that sufficient air is incorporated between the layers can the unwinding of film web 2 be achieved without problems in subsequent processing. The winding method according to the invention also ensures that film web 2 will not tear.

[0053] As mentioned at the beginning of this article, the winding of battery separators requires particularly high precision. Therefore, winding with only small clamping force and small film tension is permissible.

[0054] Figure 2 , 3 4 and 5 illustrate some embodiments of the film winding system 1. A film web 2 is fed from the film stretching device 10 to the film winding system 1. This is accomplished via the film entry region 3. The film web 2 then travels toward the first winding station 4, which is in the winding position. The first winding station 4 is configured to wind the film web 2 into a film bundle 5 (see Figure 1). Figure 3 ).

[0055] The film winding system 1 includes a contact roller 6 and an adjusting roller 8 (tension adjusting roller: Tänzerwalze). The contact roller 6 is arranged adjacent to the first winding station 4 and is configured to guide the film web 2 to the first winding station 4. The adjusting roller 8 is arranged upstream of the contact roller 6 along the direction of movement of the film web 2 and is configured to guide the film web 2 to the contact roller 6 and adjust the film tension.

[0056] Also shown is a first guide roller 9, which is arranged upstream of the adjusting roller 8 along the direction of movement of the film web 2. The film web 2 is conveyed to the first guide roller 9 through the film entry area 3. Before the film web is wound into a film bundle 5 at the first winding station 4, the film web 2 extends from the first guide roller 9 over the adjusting roller 8 toward the contact roller 6.

[0057] A first adjustment device 10 is also provided, configured to move or move the contact roller 6 toward or away from the winding station 4 (along the X-axis). This allows adjustment of a predetermined contact pressure between the contact roller 6 and the film bundle 5. If the contact pressure is above a first threshold, the contact roller 6 is moved away from the film bundle 5. If the contact pressure is below a second threshold, the contact roller 6 is moved toward the film bundle 5. The first and second thresholds can be the same or different. The first adjustment device 10 includes a slider system. The slider system preferably involves an air bearing slider system 11. The slider system can also be a hydrostatic bearing slider system. Therefore, the contact roller 6 can be moved with minimal energy consumption, especially the abrupt movement required to initially move the contact roller 6 from its rest position, which is minimal due to the air bearing structure.

[0058] The first adjustment device 10 also includes a linear motor 12 configured to move the contact roller 6 toward or away from the first winding station 4 via the air bearing slider system 11. The movement is preferably horizontal only (parallel to the ground).

[0059] There is also a control device (not shown) configured to operate the linear motor 12 of the first adjustment device 10 so that the contact roller 6 is pressed against the film bundle 5 with a predetermined clamping pressure.

[0060] The first adjusting device 10 further includes first and second radial air bearings 13. The contact roller 6 includes first and second roller necks 15 in the regions of the first and second end sides 14. These roller necks are supported in the first and second radial air bearings 13. Therefore, a separate electric motor for driving the contact roller 6 can be eliminated. The contact roller 6 is preferably rotated only by the film tension (Folienzug) of the film width 2. However, an electric motor can also be used in principle. Instead of the first and second radial air bearings 13, hydrostatic bearings can also be used.

[0061] A second adjustment device 16 is also provided, which is configured to move the adjustment roller 8 toward or away from the contact roller 6, thereby adjusting a specific film tension. If the film tension should be increased, the adjustment roller 8 is moved away from the contact roller 6. Thus, the film is taut. Conversely, if the film tension should be decreased, the adjustment roller 8 is moved toward the contact roller 6.

[0062] The second adjustment device 16 also includes an air bearing slider system 17. Therefore, the adjustment roller 8 can be moved with minimal energy consumption, especially the initial jerking motion of the adjustment roller 8 from its rest position, which is minimal due to the air bearing structure. The second adjustment device 16 may also include a hydrostatic bearing slider system.

[0063] The second adjustment device 16 also includes a linear motor 18. This linear motor is configured to move the adjustment roller 8 toward or away from the contact roller 6 via the air bearing slider system 17. The movement is preferably performed only horizontally (parallel to the ground).

[0064] A control device (not shown) is also provided, which is configured to operate the linear motor 18 of the second adjustment device 16 in such a way that a predetermined film tension can be applied via the adjustment roller 8. The film tension can be measured by a force measuring device.

[0065] The control device used to operate the linear motor 12 of the second adjustment device 16 can also be used to operate the linear motor 12 of the first adjustment device 10. However, it is also possible (e.g., in different microcontrollers) to use two different control devices.

[0066] The adjusting roller 8 is preferably supported in a rotatable manner by means of a radial air bearing 19. The adjusting roller 8 may also be supported in a rotatable manner by means of a hydrostatic bearing. Furthermore, the adjusting roller 8 is preferably not actively driven. It is preferably passively driven only by the film web 2. However, in principle, an electric motor can also be used to drive the adjusting roller 8.

[0067] about Figure 3 It is also shown that the first winding station 4 includes a substrate 4a. The substrate 4a of the first winding station 4 can be subjected to rotational motion. This can be accomplished, for example, by a (electric) motor. In its simplest case, the substrate 4a involves a (hollow) cylindrical cardboard piece. However, the substrate 4a is preferably made of metal or CFK, GFK, or a composite material of CFK and GFK. A second winding station 7 is also shown. The second winding station 7 also includes a substrate 7a. This substrate 7a can also be subjected to rotational motion. Therefore, the film web 2 can also be wound around the substrate 7a of the second winding station 7. In the figures shown, the first winding station 4 is moved into the winding position. In the winding position, the first winding station 4 is arranged adjacent to the contact roller 6. The second winding station 7 is moved into or pivots into the unloading position. In the unloading position, the film bundle 5 can be removed from the corresponding, in this case, the second winding station 7. Figure 3 The arrows indicate that the first winding station 4 can move from the winding position into or pivot into the unloading position. Similarly, the second winding station 7 can move from the unloading position (after removing the film bundle 5) into or pivot into the winding position. The movement from the winding position into the unloading position and back into the winding position is preferably circular or near-circular. The movement may also include different, preferably arc-shaped segments connected to each other or linked by straight segments. A cutting device (not shown) is also provided. The cutting device is configured such that when the first or second winding station 4, 7 pivots toward the unloading position, the film web 2 is cut along its entire width, at which point the corresponding other winding station 7, 4 is configured to further pivot into the winding position, such that the corresponding substrate 4a, 7a immediately contacts the now-formed, newly cut beginning of the film web 2 and winds this new beginning onto the already rotating substrate 4a, 7a. The cutting device preferably moves at an angle (along both the X and Y directions) to introduce a straight cut in the film web 2 based on its movement speed. However, the cutting device can also move in a straight line (alone along the Y direction), in which case the film web 2 is cut at an angle.

[0068] exist Figure 4The second steering roller 21 is shown. The second steering roller 21 is arranged downstream of the adjusting roller 8 and upstream of the contact roller 6 along the direction of movement of the film web 2. The second steering roller 21 is preferably supported in a rotatable manner by means of a radial air bearing 22. The second steering roller can also be supported in a rotatable manner by a hydrostatic bearing.

[0069] The film width 2 preferably extends horizontally from the regulating roller 8 to the second steering roller 21.

[0070] The second steering roller 21 is preferably arranged stationary. The second steering roller is preferably unable to move relative to the stationary contact roller 6 and / or adjusting roller 8.

[0071] The second steering roller 21 is preferably driven passively only. This means that the second steering roller 21 rotates only due to the film tension of the film web 2. An electric motor is preferably omitted. However, in principle, an electric motor can also be used to drive the second steering roller 21.

[0072] Both the adjusting roller 8 and the first and second steering rollers 9 and 21 preferably have corresponding roller necks, which are constructed on their end sides and are fitted into the corresponding radial air bearings 19, 20 and 22.

[0073] exist Figure 5 An embodiment of a thin film winding system 1 is shown in the figure. A first steering roller 9, an adjusting roller 8, a second steering roller 21, a contact roller 6, and a first winding workstation 4 can be seen.

[0074] The coordinate system is often given in the corresponding figures. Film web 2 moves primarily along the X-axis. The motion vector of film web 2, in addition to the component along the X-direction, also includes, at least locally, a component along the Z-direction. The rollers extend along the Y-direction in their longitudinal direction.

[0075] The corresponding radial air bearings 13, 19, 20, and 22 are not shown.

[0076] The distance between the first steering roller 9 and the contact roller 6 is preferably smaller than the distance between the adjusting roller 8 and the contact roller 6. Thus, as... Figure 4 The high degree of wrapping of the film web 2 on the regulating roller 8 is achieved as shown. In this example, the wrapping degree is approximately 180°.

[0077] The second steering roller 21 is preferably arranged closer to the contact roller 6 than the adjusting roller 8 and also preferably closer to the contact roller 6 than the first steering roller 9.

[0078] The diameter of the first steering roller 9 is substantially equal to the diameter of the second steering roller 21, but may be smaller than the diameter of the second steering roller 21. The word "substantially" includes a deviation preferably less than 5%. The diameter of the second steering roller 21 may also be smaller than, for example, the diameter of the first steering roller 9. The diameter of the adjusting roller 8 is preferably smaller than the diameter of the first steering roller 9 and / or the second steering roller 21 and / or the contact roller 6.

[0079] Next reference Figure 6 , 7 8. The air bearing slider system 11 of the first adjusting device 10 includes a first track 23 and at least one first slider 24. The at least one first slider 24 is arranged on the first track 23. The first slider 24 includes an air outlet pointing in the direction of the first track 23. The first slider 24 also includes an air interface 25 through which compressed air can be supplied. This compressed air then exits from the air outlet, thus causing the first slider to slide on the first track 23.

[0080] The first slider 24 is preferably lifted from the first track 23 during operation, such as in Figure 8 As shown in the diagram, the distance between the first track 23 and the first slider 23 is clearly magnified here. In reality, the distance is only a few hundredths of a millimeter.

[0081] The first track 23 may additionally be made of or comprise a material having a low coefficient of friction. For example, the first track 23 may be made of or comprise polytetrafluoroethylene (PTFE).

[0082] The first slider 24 preferably surrounds the first track 23 from at least three sides. The ends of the first slider 24 preferably point towards each other, so that the first slider 24 is preferably not fully lifted off the first track 23. This restricts movement in the Z direction and thus also restricts movement in the Y direction, i.e., transverse to the first track 23. Therefore, it will not "derail" during operation.

[0083] The air bearing slider system 11 of the first adjusting device 10 preferably further includes a second track 26 and at least one second slider 27. The second slider 27 includes an air outlet pointing in the direction of the second track 26. The second slider 27 includes an air interface 28 through which compressed air can be supplied. This compressed air then exits from the air outlet, allowing the second slider 27 to slide on the second track 26.

[0084] The second track 26 extends parallel to the first track 23.

[0085] In principle, it is conceivable that the air bearing slider system 11 of the first adjusting device 10 includes a third slider also arranged on the first track 23. The third slider then also includes an air outlet pointing in the direction of the first track 23. The third slider also includes an air inlet through which compressed air can be supplied. This compressed air exits from the air outlet, thereby allowing the third slider to slide on the first track 23. The first track 23 preferably has a continuous orientation or may be divided into two spaced-apart tracks. The first slider 23 is arranged on the first track and the third slider is arranged on the second track.

[0086] The same description applies to the second track 26 of the air bearing slider system 11 of the first adjusting device 10. A fourth slider may also be arranged here. The second track 26 preferably has a continuous direction or may be divided into two spaced-apart tracks.

[0087] The above also applies to the air bearing slider system 17 of the second adjusting device 16 in relation to the adjusting roller 8. The air bearing slider system 17 may also include a first track and at least one first slider arranged on the first track. The first slider includes an air outlet pointing in the direction of the first track. The first slider includes an air interface to deliver compressed air, which then exits from the air outlet, allowing the first slider to slide slidably on the first track. The second adjusting device may also, in principle, include a second track with second sliders. Two sliders may also be arranged on each track.

[0088] exist Figure 7 An embodiment of radial air bearings 13, 19, 20, and 22 is also shown, through which each roller can be supported. The respective radial air bearings 13, 19, 20, and 22 include an air interface 29 through which compressed air can be supplied. The compressed air then exits through an air outlet located inside the respective radial air bearings 13, 19, 20, and 22, thereby minimizing friction between the respective roller neck 15 and the respective radial air bearings 13, 19, 20, and 22.

[0089] The corresponding radial air bearings 13, 19, 20, 22 can be made of or comprise a material with a low coefficient of friction. The first track 23 can, for example, be made of or comprise polytetrafluoroethylene (PTFE).

[0090] Figure 9 and 10Another embodiment of the film winding system 1 is shown. In this case, a contact roller holder 30 is also provided. The contact roller holder 30 is arranged on the air bearing slider system 11 or the hydrostatic bearing slider system of the first adjusting device 10. The contact roller 6 is also arranged on the contact roller holder 30 (e.g., via a corresponding bracket 31), so that the contact roller 6 and the contact roller holder 30 can move together, i.e., synchronously.

[0091] It is also shown that the first steering roller 9, the second steering roller 21, and the adjusting roller 8 are also arranged on the contact roller frame 30. If the air bearing slider system 11 of the first adjusting device 10 is operated, then the first steering roller 9, the second steering roller 21, and the adjusting roller 8 are similarly moved. The movement is synchronized in this case. Only the adjusting roller 8 also has its second adjusting device 16 and the air bearing slider system 17 of the second adjusting device, and can move independently of the first adjusting device 10.

[0092] The motion vector of the first air bearing slider system 11 preferably extends only along the X direction, i.e., along a direction in which the film web 2 travels through the film stretching device 110. The motion vector may optionally also have a component along the Z direction, i.e., towards or away from the ground. The motion vector preferably has no component along the Y direction.

[0093] exist Figure 10 An embodiment of a film winding system 1 without a second guide roller 21 is shown. The film web 2 extends substantially horizontally from the adjusting roller 8 to the contact roller 6. The first guide roller 9 is preferably arranged closer to the contact roller frame 30 than the adjusting roller 8 and the contact roller 6.

[0094] Figure 11 An embodiment of the film winding system 1 is described, wherein the contact roller 6, the first guide roller 9, the second guide roller 21, and the adjusting roller 8 are arranged together on a base frame 32 and are movable together via a base adjustment device 33. The base adjustment device 33 in this case includes an adjustment shaft 34. The base frame 32 can move toward or away from the winding workstation 4 via the adjustment shaft 34. Alternatively, the base frame 32 can be arranged on an air bearing slider system, which moves, for example, by means of a linear motor, instead of the adjustment shaft 34. A first adjustment device 10 and a second adjustment device 16 are also present. This means that the contact roller 6 and the adjusting roller 8 can move additionally independently of the movement of the base frame 32.

[0095] Figure 12 This explains that, as already provided by Figure 11 An embodiment of such a thin film winding system 1 is known. (And...) Figure 11 The difference is, Figure 12The film winding system 1 does not include a second steering roller 21. The film web 2 preferably extends horizontally, i.e. parallel to the ground, between the adjusting roller 8 and the contact roller 6.

[0096] Figure 13 This explains that, as already provided by Figure 11 An embodiment of such a thin film winding system 1 is known. (And...) Figure 11 The difference is that the film web 2 extends not only vertically (perpendicular to the ground) between the second steering roller 21 and the contact roller 6, but also has both a horizontal component (the motion vector along the X direction) and a vertical component (the motion vector along the Z direction). This allows for adjustment of the winding degree of the film web 2 on the contact roller 6. Figure 13 In this example, the degree of wrapping is approximately 60°. The degree of wrapping is preferably greater than 0.5°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, or greater than 85°. The degree of wrapping is also preferably less than 95°, 90°, 85°, 80°, 75°, 70°, 65°, 60°, 55°, 50°, 45°, 40°, 35°, 30°, 25°, 20°, 15°, 10°, or less than 5°.

[0097] If the base adjustment device 33 is manipulated to move the base frame 32 away from the winding station 4, and the first adjustment device 10 is manipulated to move the contact roller 6 away from the second guide roller 21, then the winding degree increases. Conversely, if the base adjustment device 33 is manipulated to move the base frame 32 toward the winding station 4, and the first adjustment device 10 is manipulated to move the contact roller 6 toward the second guide roller 21, then the winding degree decreases.

[0098] Figure 14 This explains that, as already provided by Figure 13 An embodiment of such a thin film winding system 1 is known. (And...) Figure 13The difference is that the contact roller 6 rotates in the opposite direction (counterclockwise). The film web 2 preferably extends only vertically, i.e., perpendicular to the ground, between the second guide roller 21 and the contact roller 6. The second guide roller 21 is further from the ground than the contact roller 6. The winding angle is approximately 180° in this case. In this case, the center of the second guide roller 21 is further from the winding station 4 than the center of the contact roller 6. Preferably, the film web 2 leaves the second guide roller 21 at the three o'clock position and reaches the contact roller 6 at the nine o'clock position. After the contact roller carries the film web 180°, the film web 2 leaves the contact roller 6 at the three o'clock position and is conveyed to the winding station 4. The winding station 4 is arranged about three o'clock relative to the contact roller 6. The second guide roller 21 can also be arranged closer to the ground than the contact roller 6. In this case, the contact roller 6 rotates clockwise.

[0099] The roller is preferably made of or includes metal or metal alloy. Chromium is preferred. Alternatively, rollers made of carbon fiber composite material or a combination of metal rollers and carbon fiber composite rollers may be used.

[0100] The adjusting roller 8 preferably does not have a pendulum.

[0101] The speed of film web 2 at the contact roller is approximately 10 to 100 m / min.

[0102] According to the present invention, a second adjusting device 16 can also be used at the adjusting roller 8 instead of the first adjusting device 10 at the contact roller 6. In principle, it is also conceivable that radial air bearings 13, 19, 20, 22 at the contact roller 6, the adjusting roller 8, the first steering roller 9 and / or the second steering roller 21 can also be used instead of the first adjusting device 10 at the contact roller 6.

[0103] This invention is not limited to the embodiments described. Within the scope of this invention, all described and / or drawn features can be combined arbitrarily with each other.

Claims

1. A film winding system (1) for a film stretching apparatus (110), the film winding system having the following features: - A film entry area (3) is provided, through which the film web (2) to be wound can be conveyed to the film winding system (1). - A first winding workstation (4) is provided, wherein, The first winding workstation (4) is configured in the winding position to wind the film web (2) into a film bundle (5). - A contact roller (6) and an adjusting roller (8) are provided, wherein the contact roller (6) is arranged adjacent to the first winding station (4) in the winding position and is configured to guide the film web (2) to the first winding station (4). - The adjusting roller (8) is arranged upstream of the contact roller (6) along the direction of movement of the film web (2) and is configured to guide the film web (2) to the contact roller (6) and adjust the film tension; - A first adjustment device (10) is provided, and the first adjustment device is configured to move the contact roller (6) toward or away from the first winding station (4), thereby adjusting a specific contact pressure between the contact roller (6) and the film bundle (5); The thin film winding system has the following characteristics: - The first adjustment device (10) includes a slider system; - The slider system is an air bearing slider system (11). - The air bearing slider system (11) of the first adjustment device (10) includes a first track (23) and at least one first slider (24) arranged on the first track (23). - The first slider (24) includes an air outlet pointing in the direction of the first track (23); - The first slider (24) includes an air interface (25) to deliver compressed air, which then exits from an air outlet, thereby allowing the first slider (24) to slide on the first track (23).

2. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - The first slider (24) surrounds the first track (23) from at least three sides.

3. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - The air bearing slider system (11) of the first adjustment device (10) includes a second rail (26) and at least one second slider (27) arranged on the second rail (26). - The second slider (27) includes an air outlet pointing in the direction of the second track (26); - The second slider (27) includes an air interface (28) to deliver compressed air, which then exits from an air outlet, thereby allowing the second slider (27) to slide on the second track (26); - The second track (26) extends parallel to the first track (23).

4. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - The air bearing slider system (11) of the first adjustment device (10) includes a third slider arranged on the first track (23); - The third slider includes an air outlet pointing in the direction of the first track (23); - The third slider includes an air interface to deliver compressed air, which then exits from the air outlet, thereby allowing the third slider to slide on the first track (23); - The first track (23) has a continuous direction or is divided into two spaced-apart tracks for the first slider (24) and the third slider.

5. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - The first adjustment device (10) includes: First and second radial air bearings (13); or Bearings with first and second hydrostatic pressure; - The contact roller (6) includes first and second roller necks (15) supported in first and second radial air bearings (13) or first and second hydrostatic bearings in the region of the first and second end sides (14).

6. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - The first adjustment device (10) includes a linear motor (12) configured to move the contact roller (6) toward or away from the first winding station (4) via the slider system; or - The first adjustment device (10) includes an electric motor configured to rotate the adjustment shaft, thereby enabling the contact roller (6) to move toward or away from the first winding station (4).

7. The thin film winding system (1) according to claim 6, characterized in that... The following characteristics: - A control device is provided, which is configured to operate the linear motor (12) or electric motor of the first adjustment device (10) so that the contact roller (6) is pressed against the film bundle (5) with a predetermined clamping force.

8. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - A first steering roller (9) is provided; - The first steering roller (9) is arranged upstream of the regulating roller (8) along the direction of movement of the film width (2).

9. The thin film winding system (1) according to claim 8, characterized in that... The following characteristics: - The distance between the first steering roller (9) and the contact roller (6) is less than the distance between the adjusting roller (8) and the contact roller (6).

10. The thin film winding system (1) according to claim 8, characterized in that... The following characteristics: - The first steering roller (9) is supported in a rotatable manner by means of a radial air bearing or a hydrostatic bearing.

11. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - A second steering roller (21) is provided; - The second steering roller (21) is arranged downstream of the adjusting roller (8) and upstream of the contact roller (6) along the direction of movement of the film web (2).

12. The thin film winding system (1) according to claim 11, characterized in that... The following characteristics: - The second steering roller (21) is supported in a rotatable manner by means of a radial air bearing or a hydrostatic bearing.

13. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - Equipped with a contact roller frame (30); - The slider system or adjustment shaft of the first adjusting device (10) is arranged on the contact roller frame (30), so that the contact roller (6) can move relative to the contact roller frame (30); or The contact roller frame (30) is arranged on the slider system or adjustment shaft of the first adjustment device (10), wherein the contact roller (6) is arranged on the contact roller frame (30), so that the contact roller (6) and the contact roller frame (30) can move together.

14. The thin film winding system (1) according to claim 13, characterized in that... The following characteristics: - The first steering roller (9) and / or the second steering roller (21) and / or the adjusting roller (8) are arranged on the contact roller frame (30).

15. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - A base adjustment device (33) is provided, which includes a base frame (32) and an air bearing slider system or a hydrostatic bearing slider system or an adjustment shaft (34). - The contact roller (6), the adjusting roller (8), the first steering roller (9), and / or the second steering roller (21) are arranged on the base frame (32); - The base adjustment device (33) is configured to move or move the contact roller (6), the adjustment roller (8), the first steering roller (9) and / or the second steering roller (21) toward or away from the first winding station (4).

16. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - A second adjustment device (16) is provided, and the second adjustment device is configured to move the adjustment roller (8) toward or away from the contact roller (6) so as to adjust a specific film tension; - The second adjustment device (16) includes an air bearing slider system (17) or a hydrostatic bearing slider system or an adjustment shaft.

17. The thin film winding system (1) according to claim 16, characterized in that... The following characteristics: - The air bearing slider system (17) of the second adjustment device (16) includes a first rail and at least one first slider arranged on the first rail; - The first slider includes an air outlet pointing in the direction of the first track; - The first slider includes an air interface to deliver compressed air, which then exits from an air outlet, thereby enabling the first slider to slide along a first track.

18. The thin film winding system (1) according to claim 16, characterized in that... The following characteristics: - The second adjusting device (16) includes a linear motor (18) configured to move the adjusting roller (8) toward or away from the contact roller (6) via the air bearing slider system (17) or the hydrostatic bearing slider system; or - The second adjustment device includes an electric motor configured to rotate the adjustment shaft, so that the adjustment roller (8) can move toward or away from the first winding station (4).

19. The thin film winding system (1) according to claim 18, characterized in that... The following characteristics: - A control device is provided, which is configured to operate the linear motor (18) or electric motor of the second adjustment device (16) so that a predetermined film tension can be applied through the adjustment roller (8).

20. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - The adjusting roller (8) can be supported in a rotatable manner by means of a radial air bearing or a hydrostatic bearing.

21. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics - The first winding station (4) includes a substrate (4a), wherein the substrate (4a) of the first winding station (4) can be placed in a rotational motion, and the film web (2) can be wound around the substrate (4a); - A second winding station (7) with a substrate (7a) is provided, wherein the substrate (7a) of the second winding station (7) can be placed in a rotational motion, and wherein the film web (2) can be wound around the substrate (7a); - The first winding workstation (4) is configured to pivot from a winding position adjacent to the contact roller (6) to an unloading position, wherein the wound film bundle (5) can be removed from the first winding workstation (4) in the unloading position, wherein the second winding workstation (7) is configured to pivot from the unloading position to the winding position at the same time. - Equipped with a cutting device; - The cutting device is configured to cut the film web (2) across the width of the film web when the first winding station (4) pivots toward the unloading position, wherein the second winding station (7) is configured to further pivot into the winding position, so that the substrate (7a) of the second winding station (7) immediately contacts the now-formed new beginning of the film web (2).

22. The thin film winding system (1) according to claim 1, characterized in that... The following characteristics: - It is equipped with at least one discharge device; - The discharge device is arranged in the region of the film web (2) and is configured to reduce the charge on the film web (2) and / or the film bundle (5).

23. A composite structure (100), said composite structure comprising a film stretching device (110) and a film winding system (1) according to any one of claims 1 to 22, characterized in that The following characteristics: - The plastic melt can be delivered to the film stretching device (110) at the input area (111) of the film stretching device. - The film stretching apparatus (110) includes different zones (110a, 110b, 110c, 110d, 110e) in which the plastic melt is heated and / or stretched into a film web (2). - The output area (112) of the film stretching device (110) is connected to the film entry area (3) of the film winding system (1).

24. The composite structure according to claim 23, characterized in that, The composite structure has the following characteristics: the composite structure is used to manufacture and wind battery separators.

Images