Film winding mechanism, method for eliminating fine wrinkles, and film manufacturing apparatus

Abstract

The application provides a film winding mechanism, a winding method for eliminating fine wrinkles and a film manufacturing device, and belongs to the technical field of film production. The film winding mechanism comprises a first winding element, a contact roller and a flattening roller. The film passes through the flattening roller and the first winding element in turn along a winding direction. The contact roller presses against part of the film on the first winding element. The position where the contact roller contacts the film is a contact point position. The tangent point of the film and the first winding element is a tangent point position. The tangent point position and the contact point position are arranged in front-to-back order along the winding direction of the film. The application has the beneficial effect that the film can be fully flattened and degassed, and fine wrinkles and dead wrinkles that occur when the film is wound can be eliminated, thereby greatly improving the effect of film winding.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of film production, and relates to a film winding mechanism, a winding method for eliminating fine wrinkles and a film production device. BACKGROUND

[0002] The film is generally formed by directional stretching of a thick sheet. Since the film is thin, fine wrinkles and dead wrinkles are easily generated during winding, which results in that the wound film is not flat enough, and seriously affects the quality and use effect of the film.

[0003] Taking a BOPP capacitance film as an example, the capacitance film is a core medium of a film capacitor, and accounts for more than 60% of the cost of the film capacitor. The film capacitor is widely used in many industries such as household appliances, communication, power grid, industrial control, lighting and new energy (photovoltaic, wind power and automobile), and almost exists in all electronic circuits, and is an irreplaceable electronic component. The ultra-thin polypropylene electrical film is an electrical film formed by directional stretching of a polypropylene resin thick sheet. The ultra-thin polypropylene electrical film is one of components of the film capacitor. If fine wrinkles and dead wrinkles exist on the ultra-thin polypropylene electrical film, the metal cannot be evaporated to the position of the dead wrinkles in the subsequent process, thereby causing a serious defect, and resulting in that the performance of the film capacitor produced in the subsequent production cannot meet the requirements.

[0004] The existing winding mechanism causes the wound parent roll to have fine wrinkles and dead wrinkles due to insufficient flattening and exhaust during winding of the film, and further affects the subsequent use. SUMMARY

[0005] The application aims at the above problems existing in the prior art, and provides a film winding mechanism, a winding method for eliminating fine wrinkles and a film production device.

[0006] The application can be realized by the following technical scheme: a film winding mechanism, comprising: a first winding element, a contact roller and a flattening roller; the film passes through the flattening roller and the first winding element in sequence along a winding direction, the contact roller is pressed against part of the film on the first winding element, a position where the contact roller contacts the film is a contact point position, and a tangent point of the film and the first winding element is a tangent point position, the tangent point position and the contact point position are arranged in front and back order along the winding direction of the film; during winding of the film, the film first passes through the flattening roller to be flattened for the first time, then passes through the tangent point position to be wound to the first winding element, and finally passes through the contact point position to be flattened for the second time by the contact roller.

[0007] Preferably, a part of the surface of the first winding element between the tangent point position and the contact point position is an exhaust flattening area.

[0008] Preferably, the first winding element corresponds to the central angle of the exhaust flattening area ≥10°.

[0009] Preferably, the straight line formed by the contact point position and the center of the contact roller is the X-axis, and the tangent line of the contact roller at the contact point position is the Y-axis. The contact point position and the tangent point position have a predetermined offset value I in the X-axis direction.

[0010] Preferably, the flattening roller corresponds to the wrap angle of the film ≥100°.

[0011] Preferably, the flattening roller is a variable diameter structure, and the middle part of the flattening roller gradually decreases in diameter to both ends. When the film passes through the flattening roller, it is longitudinally flattened and transversely flattened by the variable diameter structure.

[0012] Preferably, the surface of the flattening roller is provided with exhaust grooves in a rhombic grid shape.

[0013] Preferably, the two sides of the exhaust groove are provided with chamfers at the connection with the surface of the flattening roller.

[0014] Preferably, the center of the first winding element and the center of the contact roller are located on the X-axis.

[0015] Preferably, the flattening roller is located below the contact roller in the Y-axis direction, and the center of the flattening roller and the center of the contact roller have a predetermined offset value II in the X-axis direction.

[0016] Preferably, the predetermined offset value II is 50-100mm.

[0017] Preferably, it further comprises a driving motor, the contact roller can move along the X-axis, the contact roller is connected with the driving motor, and the driving motor can drive the contact roller to move; as the diameter of the film on the first winding element increases, the driving motor adjusts the position of the contact roller on the X-axis according to the constant contact force set by the contact roller to increase the distance between the contact roller and the first winding element in the X-axis direction.

[0018] Preferably, the flattening roller can move relative to the first winding element to adjust the tangent point position.

[0019] Preferably, it further comprises an air knife, and the air outlet of the air knife is aligned with the exhaust flattening area.

[0020] Preferably, the air outlet of the air knife is provided in the shape of a hawk's beak.

[0021] Preferably, it further comprises an electrode and a corona treatment roller, the electrode is close to the corona treatment roller, and the electrode performs corona treatment on the film passing through the corona treatment roller.

[0022] Preferably, the electrode is arranged on the side of the corona treatment roller in an arc surface structure consistent with the curvature of the surface of the corona treatment roller.

[0023] Preferably, the thin film winding mechanism further comprises a tension detection roller connected with a sensor, the sensor controls the rotating speed of the first winding element according to the tension of the thin film on the tension detection roller.

[0024] Preferably, the thin film winding mechanism further comprises a rotating disc and a second winding element, the first winding element and the second winding element are both installed on the rotating disc, the first winding element and the second winding element are symmetrically arranged about the center of rotation of the rotating disc, and the rotating disc can drive the first winding element and the second winding element to alternately switch positions.

[0025] Preferably, the thin film winding mechanism further comprises a first traction drive roller, a second traction drive roller, a third traction drive roller, a fourth traction drive roller, a fifth traction drive roller and a sixth traction drive roller.

[0026] The thin film sequentially passes through the first traction drive roller, the second traction drive roller, the third traction drive roller, the fourth traction drive roller, the corona treatment roller, the fifth traction drive roller, the sixth traction drive roller, the tension detection roller and the flattening roller, and is wound by the first winding element.

[0027] A winding method for eliminating fine wrinkles is also provided, comprising the thin film winding mechanism, and further comprising the following steps:

[0028] S1: The thin film sequentially passes through the flattening roller and the first winding element in the winding direction, and the thin film passes through the tangent point position before passing through the contact point position, the thin film contacts the first winding element at the tangent point position, and the contact roller contacts the thin film on the first winding element at the contact point position;

[0029] S2: The thin film is flattened for the first time when passing through the flattening roller, and the surface of the flattening roller flattens the thin film in the horizontal direction and the vertical direction to preliminarily eliminate the fine wrinkles on the thin film;

[0030] S3: The thin film separated from the surface of the flattening roller moves a certain distance and contacts the first winding element at the tangent point position, the thin film removes the gas between adjacent layers of thin films by passing through the air exhaust flattening area before moving to the contact point position, and the contact roller contacts the thin film and applies a constant contact force to the thin film when the thin film reaches the contact point position, thereby flattening the thin film for the second time, and the thin film obtains sufficient flattening space by passing through the air exhaust flattening area during the second flattening.

[0031] A film manufacturing device is also provided, comprising the thin film winding mechanism.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] 1. The film can be fully flattened and degassed, and the fine wrinkles and dead wrinkles during film winding can be eliminated, thereby greatly improving the film winding effect.

[0034] 2. The flattening roller has a variable diameter structure with a thick middle and thin ends, which enables the flattening roller to flatten the film in the transverse direction in addition to the longitudinal direction, ensuring that the flattening roller can fully eliminate the fine wrinkles in the transverse and longitudinal directions of the film, significantly improving the flattening effect.

[0035] 3. The drive motor can drive the contact roller to continuously move away from the first winding element at a predetermined speed, so that the contact roller maintains constant contact force with the film surface.

[0036] 4. The flattening roller can move in the X-axis and Y-axis directions and be fixed after adjustment. By adjusting the position of the flattening roller, the point of tangency can be changed, and the wrap angle corresponding to the degassing and flattening area can also be changed.

[0037] 5. An air knife is added to assist in flattening the film. The air outlet of the air knife is aligned with the degassing and flattening area. The airflow blown by the air knife impacts on the film, which can flatten the film, further improving the film winding effect and reducing fine wrinkles and dead wrinkles during winding. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic view of the relative positions of the first winding element, the contact roller and the flattening roller of the present application.

[0039] Figure 2 is a schematic view of the working principle of the first winding element, the contact roller and the flattening roller of the present application.

[0040] Figure 3 is a schematic view of the structure of the film winding mechanism of the present application.

[0041] Figure 4 is a schematic view of the structure of the flattening roller of the present application.

[0042] Figure 5 is a schematic view of the structure of the degassing groove of the present application.

[0043] In the figure, 100, rotating disc; 110, first winding element; 120, second winding element; 200, contact roller; 210, driving motor; 300, flattening roller; 310, air exhaust groove; 410, contact point position; 420, cutting point position; 430, air exhaust flattening area; 500, air knife; 610, electrode; 620, corona treatment roller; 700, tension detection roller; 710, sensor; 810, first traction driving roller; 820, second traction driving roller; 830, third traction driving roller; 840, fourth traction driving roller; 850, fifth traction driving roller; 860, sixth traction driving roller. DETAILED DESCRIPTION

[0044] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0045] As Figures 1-2 shown, a film winding mechanism, comprising: a first winding element 110, a contact roller 200 and a flattening roller 300; the film passes through the flattening roller 300 and the first winding element 110 in turn along the winding direction, the contact roller 200 presses the part of the film on the first winding element 110, the position where the contact roller 200 contacts the film is the contact point position 410, the cutting point of the film and the first winding element 110 is the cutting point position 420, and the cutting point position 420 and the contact point position 410 are arranged in front and back order along the winding direction of the film; when winding the film, the film first passes through the flattening roller 300 for the first flattening, then passes through the cutting point position 420 and is wound to the first winding element 110, and finally passes through the contact point position 410 and is flattened for the second time by the contact roller 200.

[0046] It can be understood that the first winding element 110, the contact roller 200 and the flattening roller 300 do not have strict front and back or up and down arrangement order, and the most critical between the three is the relative position, that is, the contact roller 200 needs to be close to the first winding element 110 so as to contact the film on the first winding element 110, and the relative position of the flattening roller 300 and the first winding element 110 determines the cutting point position 420 of the film and the first winding element 110. From the design principle, by controlling the relative positions of the first winding element 110, the contact roller 200 and the flattening roller 300, the cutting point position 420 and the contact point position 410 can be made not to coincide, so as to avoid that the film is compacted by the contact roller 200 at the same time when contacting the first winding element 110. And the film in the present scheme can be an electrical film, or other kinds of film.

[0047] It needs to be supplemented that the structure of the first winding element 110 is that a female roll is sleeved on a steel core, and the cutting point position 420 is actually the contact cutting point of the film and the surface of the female roll on the first winding element 110.

[0048] In the existing winding mechanism, a winding end is provided with a winding roller and a contact roller, wherein the contact roller serves as both a compression roller and a tension-related roller. Since the film is compressed by the contact roller as soon as it comes into contact with the surface of the winding roller, the film cannot be fully flattened and degassed, resulting in fine wrinkles on the film on the parent roll, and dead wrinkles after being compressed by the winding roller, and poor film surface quality.

[0049] The present embodiment adds a flattening roller 300 to the existing winding mechanism. The relative position of the flattening roller 300 to the first winding element 110 determines the tangent point position 420, so that the tangent point position 420 is separated from the contact point position 410. When the film is wound, it is flattened for the first time after passing through the flattening roller 300, thereby eliminating fine wrinkles caused by tensile stress. Then the film separates from the flattening roller 300 and continues to move a certain distance until the tangent point position 420. The film contacts the parent roll on the first winding element 110 at the tangent point position 420. At this time, there is a certain amount of gas between the film and the surface of the parent roll (i.e. the adjacent two layers of film). If this gas is not removed, it will cause dead wrinkles. In the present embodiment, a portion of the area between the tangent point position 420 and the contact point position 410 is reserved. When the contact roller 200 contacts the film at the contact point position 410, the film can degas and flatten through the area between the tangent point position 420 and the contact point position 410, thereby achieving the effect of the second flattening. In the second flattening, fine wrinkles that may be formed during winding of the film are eliminated.

[0050] The present winding mechanism can fully flatten and degas the film, eliminate fine wrinkles and dead wrinkles that may occur during winding of the film, and thus greatly improve the effect of winding the film.

[0051] In the present embodiment, the portion of the surface of the first winding element 110 between the tangent point position 420 and the contact point position 410 is the degassing and flattening area 430.

[0052] The film at the contact point position 410 is subjected to pressure or contact force applied by the contact roller 200, so as to tightly adhere to the parent roll. In this process, the gas between the film and the surface of the parent roll can be removed from the degassing and flattening area 430, preventing dead wrinkles from being formed during winding.

[0053] It can be understood that, since the tangent point position 420 and the contact point position 410 do not coincide, the degassing and flattening area 430 must be formed between the two.

[0054] Preferably, the first winding element 110 corresponds to a central angle of the exhaust flattening area 430 ≥ 10°. It can be understood that the exhaust flattening area 430 is arc-shaped, and the size of the exhaust flattening area 430 can be represented by the corresponding central angle. The larger the central angle, the larger the exhaust flattening area 430. When the central angle of the first winding element 110 corresponding to the exhaust flattening area 430 is 10°, the flattening effect of the exhaust is best.

[0055] As shown in Figure 1 , an X-Y coordinate axis is established, the straight line connecting the contact point position 410 and the center of the contact roller 200 is the X axis, and the tangent line of the contact roller 200 at the contact point position 410 is the Y axis. There is a predetermined offset value I in the X axis direction between the contact point position 410 and the tangent point position 420.

[0056] Because the contact point position 410 and the tangent point position 420 have a predetermined offset value I in the X axis direction, the part of the film transported to the tangent point position 420 on the flattening roller 300 is in an inclined shape, so that the tangent point position 420 is advanced compared to the contact point position 410, and it is ensured that the two do not coincide.

[0057] As shown in Figures 1-2 , on the basis of the above embodiment, the wrapping angle of the flattening roller 300 corresponding to the film is ≥ 100°. The flattening roller 300 flattens the film transported to the first winding element 110. The larger the wrapping angle of the flattening roller 300 corresponding to the film, the larger the area of the surface of the flattening roller 300 in contact with the film. The wrapping angle ≥ 100° belongs to a large wrapping angle structure, so that the flattening effect of the flattening roller 300 is more obvious.

[0058] As shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 , on the basis of the above embodiment, the flattening roller 300 is a variable diameter structure, the middle part of the flattening roller 300 gradually decreases in diameter to both ends, and the film is longitudinally flattened when passing through the flattening roller 300 and is transversely flattened by the variable diameter structure.

[0059] It can be understood that the variable diameter structure is a structure with gradually changing diameter. The diameter of a conventional roller is consistent everywhere, but such a roller can only flatten the film longitudinally and cannot eliminate transverse wrinkles. Therefore, the effect is poor. In the present embodiment, the flattening roller 300 has a variable diameter structure with a thick middle and thin ends. This makes the flattening roller 300 not only have the function of longitudinal flattening, but also can flatten the film transversely. It is ensured that the flattening roller 300 can fully eliminate the transverse wrinkles and longitudinal wrinkles on the film, and the flattening effect is obviously improved.

[0060] Based on the above embodiments, the surface of the flattening roller 300 is provided with a diamond-shaped grid of venting grooves 310. When the film is attached to the surface of the flattening roller 300, the venting grooves 310 can be used to vent air, thereby enhancing the venting effect when the film is attached to the surface of the flattening roller 300 and thus flattening the film more fully.

[0061] Based on the above implementation method, chamfers are provided at the connection between the two sides of the exhaust groove 310 and the surface of the flattening roller.

[0062] In this embodiment, the chamfering allows for a smooth transition at the connection between the venting groove 310 and the flattening roller surface, preventing the formation of sharp corners that could scratch the film surface.

[0063] It should be noted that a special coating can also be applied to the surface of the flattening roller to reduce friction with the film and prevent scratches on the film.

[0064] like Figure 1 As shown, based on the above embodiment, the center of the first winding element 110 and the center of the contact roller 200 are both located on the X-axis. For example, the contact roller 200 and the first winding element 110 are at the same horizontal height and are distributed left to right.

[0065] Based on the above implementation, with the Y-axis direction as the up-down direction, the flattening roller 300 is located below the contact roller 200, and the center of the flattening roller 300 and the center of the contact roller 200 have a predetermined offset value II in the X-axis direction.

[0066] In this embodiment, the maximum diameter of the flattening roller 300 is assumed to be the same as the diameter of the contact roller 200. The flattening roller 300 is located below the contact roller 200, and the two are offset in the X-axis direction. This causes a deviation between the right side point of the flattening roller 300 and the right side point of the contact roller 200, and tilts the film from the flattening roller 300 to the first winding element 110. The cutting point position 420 and the contact point position 410 are offset in the X-axis. For example, the predetermined offset value II is 50-100 mm.

[0067] like Figures 1-3 As shown, based on the above embodiment, the film winding mechanism further includes a drive motor 210, a contact roller 200 that can move along the X-axis, the contact roller 200 being connected to the drive motor 210, and the drive motor 210 driving the contact roller 200 to move; as the diameter of the film on the first winding element 110 increases, the drive motor 210 adjusts the position of the contact roller 200 on the X-axis according to the constant contact force set by the contact roller 200 to increase the distance between the contact roller 200 and the first winding element 110 in the X-axis direction.

[0068] In the embodiment, the distance between the contact roller 200 and the first winding element 110 (the parent roll surface) is adjustable. When the film is being wound, the diameter of the parent roll gradually increases, so the contact roller 200 needs to be driven to move along the X axis by the driving motor 210 to reserve enough space to avoid interference with the film and prevent the contact force from being too large.

[0069] For example, a linear guide rail is arranged on the X axis, the contact roller 200 is connected to the linear guide rail and can move along the linear guide rail, and the driving motor 210 is a linear motor. The driving motor 210 can drive the contact roller 200 to continuously move away from the first winding element 110 at a predetermined speed, so that the contact roller 200 and the film surface maintain a constant contact force.

[0070] As shown in Figures 1-3 On the basis of the above embodiment, the flattening roller 300 can move relative to the first winding element 110 to adjust the tangent point position 420. The position of the flattening roller 300 can be adjusted according to actual needs. For example, the flattening roller 300 can move in the X axis direction and the Y axis direction, and is fixed after adjustment. By adjusting the position of the flattening roller 300, the tangent point position 420 can be changed, and the corresponding wrap angle of the exhaust flattening area 430 can be changed.

[0071] As shown in Figures 1-2 On the basis of the above embodiment, the film winding mechanism further comprises an air knife 500, and the air outlet of the air knife 500 is aligned with the exhaust flattening area 430. In the embodiment, the air knife 500 is additionally provided to assist in flattening the film. The air outlet of the air knife 500 is aligned with the exhaust flattening area 430. The airflow blown by the air knife 500 can flatten the film, further improve the effect of film winding, and reduce the fine wrinkles and dead wrinkles generated during winding.

[0072] It should be noted that the air outlet direction is not perpendicular to the surface of the film, but is inclined downward relative to the surface of the film, that is, the airflow of the air knife 500 is inclined to act on the surface of the film. Before the film passes through the contact point position 410, it also passes through the flattening and exhaust of the high-pressure airflow, and the airflow presses the film in the exhaust flattening area 430, thereby playing a certain fixing role to avoid the film from moving.

[0073] In the embodiment, the air outlet of the air knife 500 is provided in the shape of a hawk's beak. The hawk's beak-shaped air outlet can make the airflow more concentrated and prevent the airflow from stringing upwards (that is, prevent the airflow from rebounding to the film at the contact point position 410), so that the airflow can better flatten and exhaust the film.

[0074] As shown in Figure 3As shown, based on the above embodiment, the film winding mechanism further includes an electrode 610 and a corona treatment roller 620. The electrode 610 is close to the corona treatment roller 620, and the electrode 610 performs corona treatment on the film passing through the corona treatment roller 620. Corona treatment can eliminate static electricity on the film surface.

[0075] In this embodiment, the side of the electrode 610 facing the corona treatment roller 620 is configured as an arc surface structure that matches the curvature of the roller surface of the corona treatment roller 620.

[0076] When winding up the film, edge wrinkles are prone to occur. This phenomenon is usually caused by poor static electricity elimination of the film. Existing corona treatment generators have electrodes with excessively long lateral widths, resulting in incomplete elimination of static electricity generated on the film surface. To achieve complete static electricity elimination, in this embodiment, the side of electrode 610 facing the corona treatment roller 620 is configured as an arc-shaped structure. All points on the arc-shaped structure are equidistant from the surface of the corona treatment roller 620. The film on the corona treatment roller 620 is corona-treated through this arc-shaped structure, thereby achieving complete static electricity elimination. Therefore, edge wrinkles are completely eliminated during subsequent winding, effectively solving the edge wrinkling problem.

[0077] like Figure 3 As shown, based on the above embodiment, the film winding mechanism further includes a tension detection roller 700, which is connected to a sensor 710. The sensor 710 controls the rotational speed of the first winding element 110 according to the film tension on the tension detection roller 700.

[0078] like Figure 3 As shown, based on the above embodiment, it also includes a turntable 100 and a second winding element 120. The first winding element 110 and the second winding element 120 are both mounted on the turntable 100. The first winding element 110 and the second winding element 120 are symmetrically arranged about the rotation center of the turntable 100. The turntable 100 can drive the first winding element 110 and the second winding element 120 to alternately switch their positions.

[0079] It should be noted that the turntable 100 has two stations: a winding station and a standby station. The turntable 100 rotates to switch between these two stations for the first winding element 110 and the second winding element 120. When the first winding element 110 is fully wound, the core can be replaced without stopping the machine. When replacing the core, the turntable 100 rotates 180°, moving the second winding element 120 to the winding station. The film is then adhered to the second winding element 120, cut, and wound up using the second winding element 120. Finally, the core from the first winding element 110 is removed.

[0080] like Figure 3As shown, on the basis of the above-mentioned embodiment, it further comprises a first traction drive roller 810, a second traction drive roller 820, a third traction drive roller 830, a fourth traction drive roller 840, a fifth traction drive roller 850 and a sixth traction drive roller 860.

[0081] The film passes through the first traction drive roller 810, the second traction drive roller 820, the third traction drive roller 830, the fourth traction drive roller 840, the corona treatment roller 620, the fifth traction drive roller 850, the sixth traction drive roller 860, the tension detection roller 700 and the flattening roller 300 in sequence and is wound by the first winding element 110.

[0082] As shown, the film is wound by the first winding element 110 after passing through the flattening roller 300 and the first traction drive roller 810 in sequence. Figures 1-4 As shown, a winding method for eliminating fine wrinkles is also proposed, comprising a film winding mechanism, and the following steps:

[0083] S1: The film passes through the flattening roller 300 and the first winding element 110 in sequence along the winding direction, and the film passes through the contact point position 410 before passing through the tangent point position 420. The film contacts the first winding element 110 at the tangent point position 420, and the contact roller 200 contacts the film on the first winding element 110 at the contact point position 410.

[0084] S2: The film is flattened for the first time when passing through the flattening roller 300. The surface of the flattening roller 300 flattens the film in the horizontal direction and the vertical direction, thereby preliminarily eliminating the fine wrinkles on the film.

[0085] S3: The film separated from the surface of the flattening roller 300 moves a certain distance and contacts the first winding element 110 at the tangent point position 420. The film removes the gas between adjacent layers of the film through the air exhaust flattening area 430 before moving to the contact point position 410. When the film reaches the contact point position 410, the contact roller 200 contacts the film and applies a constant contact force to the film, thereby flattening the film for the second time. The film obtains sufficient flattening space through the air exhaust flattening area 430 during the second flattening.

[0086] The film is first flattened by the flattening roller 300, and the film is first flattened on the surface of the flattening roller 300, and in the first flattening process, the film not only eliminates the longitudinal fine wrinkles, but also eliminates the transverse fine wrinkles through the variable-diameter structure, and then is wound by the first winding element 110 at the cutting point position 420, the air knife 500 blows high-pressure air flow to the film in the exhaust flattening area 430, the high-pressure air flow impacts the film at an inclined angle to make it more flat, and then the film comes to the contact point position 410, the contact roller 200 contacts and winds the film with a constant contact force, the film is flattened for the second time at the contact point position 410, and in this process, the gas between the film and the surface of the parent roll is squeezed out, and the exhaust flattening area 430 provides sufficient space for the film to be fully flattened and exhausted during the second flattening.

[0087] In the method, the flattening roller 300 is ingeniously added, and the relative positions of the flattening roller 300 and the contact roller 200 are adjusted, so that the flattening roller 300 moves forward by a predetermined offset value II in the X-axis direction, so that the film contacts the first winding element 110 at an inclined angle, so that the cutting point position 420 moves forward compared with the contact point position 410, so that the cutting point position 420 and the contact point position 410 do not coincide, and the cutting point position 420 is located before the contact point position 410, so that the film is not immediately compacted when it contacts the first winding element 110, but there is a certain buffer area (i.e., the exhaust flattening area 430), and the film can be exhausted or flattened through the exhaust flattening area 430 when it is compacted by the contact roller 200, avoiding the generation of dead wrinkles.

[0088] A film manufacturing device is also provided, which includes a film winding mechanism. The film manufacturing device can particularly manufacture ultra-thin films, because such ultra-thin films are very prone to fine wrinkles and dead wrinkles during winding, and conventional film manufacturing devices cannot avoid the generation of fine wrinkles and dead wrinkles during the winding stage, but through the film winding mechanism, especially through the separation of the cutting point position 420 and the contact point position 410, the situation of fine wrinkles and dead wrinkles during winding can be significantly improved. Therefore, in the metal evaporation process, the surface of the film can be completely covered by a metal layer, so that the performance of the subsequently produced film capacitor meets the requirements.

[0089] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0090] In addition, the descriptions such as "first", "second", "one", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included at least one of the features.

[0091] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing", etc. should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited.

[0092] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

Claims

1. A film winding mechanism, characterized in that, The application relates to a film winding device. The film winding device comprises a first winding element (110), a contact roller (200) and a flattening roller (300). The film passes through the flattening roller (300) and the first winding element (110) in sequence along a winding direction, the contact roller (200) presses against the part of the film on the first winding element (110), the position where the contact roller (200) contacts the film is a contact point position (410), the cutting point position (420) of the film and the first winding element (110) is arranged in front of the contact point position (410) along the winding direction of the film, when the film is wound, the film is first flattened by the flattening roller (300), then is wound to the first winding element (110) through the cutting point position (420), and finally is flattened again by the contact roller (200) when passing through the contact point position (410). The surface of the first winding element (110) between the cutting point position (420) and the contact point position (410) is an air exhausting flattening area (430). The straight line connecting the contact point position (410) and the center of the contact roller (200) is the X axis, the tangent line of the contact roller (200) at the contact point position (410) is the Y axis, and the contact point position (410) and the cutting point position (420) have a predetermined offset value I in the X axis direction. The air knife (500) is further arranged, and the air outlet of the air knife (500) is aligned with the air exhausting flattening area (430).

2. A film winding mechanism as claimed in claim 1, characterized in that: The central angle of the first winding element (110) corresponding to the air exhausting flattening area (430) is greater than or equal to 10 degrees.

3. A film winding mechanism as claimed in claim 1, characterized in that: The wrapping angle of the flattening roller (300) corresponding to the film is greater than or equal to 100 degrees.

4. A film winding mechanism as claimed in claim 1 or 3, characterized in that: The flattening roller (300) has a variable-diameter structure, the middle part of the flattening roller (300) gradually decreases in diameter towards both ends, the film is longitudinally flattened when passing through the flattening roller (300) and is transversely flattened by the variable-diameter structure.

5. A film winding mechanism as claimed in claim 4, characterized in that: The surface of the flattening roller (300) is provided with air exhausting grooves (310) in a rhombic grid shape.

6. A film winding mechanism as claimed in claim 5, characterized in that: The connecting positions of the two sides of the air exhausting grooves (310) and the surface of the flattening roller (300) are provided with chamfers.

7. A film winding mechanism as claimed in claim 1, wherein: The center of the first winding element (110) and the center of the contact roller (200) are located on the X axis.

8. A film winding mechanism as claimed in claim 7, characterized in that: The flattening roller (300) is located below the contact roller (200) in the up-down direction of the Y axis, and the center of the flattening roller (300) and the center of the contact roller (200) have a predetermined offset value II in the X axis direction.

9. A film winding mechanism as claimed in claim 8, characterized in that: The predetermined offset value II is 50-100 mm.

10. A film winding mechanism as claimed in claim 7, wherein: Further comprising a driving motor (210), the contact roller (200) is movable along the X axis, the contact roller (200) is connected with the driving motor (210), and the driving motor (210) can drive the contact roller (200) to move; as the diameter of the film on the first winding element (110) increases, the driving motor (210) adjusts the position of the contact roller (200) on the X axis according to the constant contact force set by the contact roller (200) to increase the distance between the contact roller (200) and the first winding element (110) in the X axis direction.

11. A film winding mechanism as claimed in claim 8, wherein: The flattening roller (300) is movable relative to the first winding element (110) to adjust the cut point position (420).

12. A film winding mechanism as claimed in claim 1, characterized in that: The gas outlet of the air knife (500) is provided in the shape of a hawk's beak.

13. A film winding mechanism as claimed in claim 1, wherein: Further comprising an electrode (610) and a corona treatment roller (620), the electrode (610) is close to the corona treatment roller (620), and the electrode (610) performs corona treatment on the film passing through the corona treatment roller (620).

14. A film winding mechanism as claimed in claim 13, characterized in that: The side of the electrode (610) facing the corona treatment roller (620) is provided in an arc surface structure consistent with the curvature of the roller surface of the corona treatment roller (620).

15. A film winding mechanism as claimed in claim 13, wherein: Further comprising a tension detection roller (700) connected with a sensor (710), the sensor (710) controls the rotating speed of the first winding element (110) according to the film tension on the tension detection roller (700).

16. A film winding mechanism as claimed in claim 15, characterized in that: Further comprising a turntable (100) and a second winding element (120), the first winding element (110) and the second winding element (120) are both mounted on the turntable (100), the first winding element (110) and the second winding element (120) are symmetrically arranged about the center of rotation of the turntable (100), and the turntable (100) can drive the first winding element (110) and the second winding element (120) to alternately switch positions.

17. A film winding mechanism as claimed in claim 15 or 16, characterized in that: Further comprising a first traction drive roller (810), a second traction drive roller (820), a third traction drive roller (830), a fourth traction drive roller (840), a fifth traction drive roller (850), and a sixth traction drive roller (860). The film passes through the first traction drive roller (810), the second traction drive roller (820), the third traction drive roller (830), the fourth traction drive roller (840), the corona treatment roller (620), the fifth traction drive roller (850), the sixth traction drive roller (860), the tension detection roller (700), and the flattening roller (300) in sequence and is wound by the first winding element (110).

18. A crepe-eliminating winding method characterized by comprising: Comprising: The film winding mechanism according to any one of claims 1-17, further comprising the following steps: The film winding mechanism according to any one of claims 1-17, further comprising the following steps: S1: the film passes through the flattening roller (300) and the first winding element (110) in turn along the winding direction, and the film passes through the contact point position (410) before the cut point position (420), and the film contacts the first winding element (110) at the cut point position (420), and the contact roller (200) contacts the film on the first winding element (110) at the contact point position (410); S2: the film is first flattened when passing through the flattening roller (300), and the surface of the flattening roller (300) flattens the film in the transverse direction and the longitudinal direction to preliminarily eliminate the fine wrinkles on the film; S3: the film separated from the surface of the flattening roller (300) moves a certain distance and contacts the first winding element (110) at the cut point position (420), and the film passes through the air exhaust flattening area (430) to exhaust the gas between adjacent layers of the film before moving to the contact point position (410), and when the film reaches the contact point position (410), the contact roller (200) contacts the film and applies a constant contact force to the film to flatten the film for the second time, and the film obtains sufficient flattening space through the air exhaust flattening area (430) during the second flattening.

19. A film production apparatus, characterized by comprising: The film winding mechanism according to any one of claims 1-17. The film winding mechanism according to any one of claims 1-17.

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