TW201919977A - Winding device and winding method - Google Patents

Abstract

Provided are a winding device and a winding method that can prevent deformation failure in a film. Winding is initiated by initiating the rotation of a winding core (18). Pressing the outer circumferential surface of a film roll (32) by means of pressing mechanisms (40, 110) is prohibited until a first period elapses after winding is initiated, and the pressing of the outer circumferential surface of the film roll (32) is initiated after the first period has elapsed. The pressing force with which the outer circumferential surface of the film roll (32) is pressed is increased according to the increase in the wound amount of the film (14) until a second period elapses after the pressing of the outer circumferential surface of the film roll (32) is initiated. The amount of the film (14) wound during the first and second periods is at most 10% of the total amount of the film (14) wound from the initiation to the completion of winding.

Description

   Winding device and winding method   

The present invention relates to a winding device and method for winding a film by winding a strip-shaped film to a winding core.

As a method for producing a band-shaped film, a solution film forming method is widely known. The solution film forming method is to form a casting film by dissolving a doping solution of a polymer polymer such as cellulose halide in a casting solvent on a running casting support, and peeling the casting from the casting support. Film to form a film and dry the formed film.

The film manufactured as above is wound up by being wound on a winding core. Thereby, a film roll is formed. When the film is wound, the thickness of the air layer formed between the overlapping films in the film roll is controlled by adjusting the tension of the film and / or pressing the outer peripheral surface of the film roll toward the inside (see Patent Document 1 to below) 4).

    [Previous Technical Literature]         [Patent Literature]    

[Patent Document 1] Japanese Unexamined Patent Publication No. 04-106057

[Patent Document 2] Japanese Patent Laid-Open No. 60-128153

[Patent Document 3] Japanese Patent Laid-Open No. 2013-129540

[Patent Document 4] Japanese Patent Laid-Open No. 2010-150041

However, conventionally, deformation failures such as transfer failures and corner take-up failures have occurred and need to be improved. The transfer failure is a deformation failure that occurs when the thickness of the air layer is thin and the tightness of the overlapping film in the film roll is high. Due to the unevenness of the outer periphery of the core, the front, rear, and seams of the film This occurs after the transfer to the overlapped film. In addition, the corner winding failure is a deformation failure that occurs when the thickness of the air layer is thick and the tightness of the film in the film roll is low, which occurs because the outer periphery of the film roll cannot maintain a circular shape.

The present invention was made in view of the above background, and an object thereof is to provide a winding device and a winding method capable of preventing deformation and failure of a film.

In order to achieve the above object, a winding device of the present invention is configured to wind a film by winding a tape-like film around a winding core, and the winding device includes a pressing portion that is pressed toward the winding core side by The outer peripheral surface of the rolled film roll; and a pressing force control unit that controls the pressing force of the pressing unit to squeeze the film roll, and the pressing force control unit is prohibited from the start of film winding until the prescribed first period has passed. Squeezing starts after the first period has passed. From the beginning of the squeeze until the second period has passed, the squeeze force increases with the increase in the amount of film winding. From the beginning of the coil to the first and second passes, The winding amount of the film wound up to that period is less than 10% of the total winding amount wound up from the start of winding to the end of winding.

The total take-up volume can be more than 1000m.

The winding amount of the film wound in the first period may be 3% or less of the total winding amount.

The increase in the pressing force during the second period may be 1% / m or more and 10% / m or less.

The outer diameter of the winding core may be 15 cm or more and 50 cm or less.

The film may have unevenness having a height of 2 μm or more and 20 μm or less on both sides.

The pressing portion may be a person having a pressing roller and pressing the outer peripheral surface of the pressing roller against the outer peripheral surface of the film roll.

The pressing part may be a person who is provided with an air supply device and is configured to supply air to the outer peripheral surface of the film roll using the air supply device to perform the pressing.

In the first and second periods, the film can be wound by straightly winding the side edges of the film into alignment. After the second period, the film can be periodically circulated within a certain range with respect to the width direction of the film. The film was wound by shifting the film to the side edge of the film.

The thickness of the film may be 10 μm or more and 60 μm or less.

The film may be one containing cellulose tritide.

In addition, in order to achieve the above object, a winding method of the present invention is a winding method for winding a film by winding a strip-shaped film around a winding core. The winding method includes a first winding process, In order to perform the process from the start of film winding to the lapse of a predetermined first period, the film winding is performed in a state in which pressing by a pressing portion is prohibited, and the pressing portion is pressed toward the core side and is rolled. The outer peripheral surface of the produced film roll is taken; and the second roll take-up process is a process from the passage of the first period to the passage of a predetermined second period. As the take-up amount of the film increases, the extrusion by the extrusion part is performed. When the pressure increases, the film is wound up, and the winding amount of the film wound from the start of winding to the first and second periods is set to the total winding amount of winding from the start of winding to the end of winding Less than 10%.

In the present invention, the first period in which the outer peripheral surface of the unextruded film roll is provided during the period until 10% of the total take-up of the film is taken up, and the film take-up is increased as the take-up amount of the film increases In the second period in which the pressing force on the outer peripheral surface of the roll is increased, it is possible to prevent deformation failure of the film.

10, 100‧‧‧ Take-up device

12‧‧‧ film manufacturing equipment

14‧‧‧ film

16‧‧‧ Knurling imparting roller

18‧‧‧ core

20‧‧‧ Turntable device

22‧‧‧ Motor

30, 140‧‧‧ Control Department

32‧‧‧ film roll

40, 110‧‧‧Squeeze mechanism (squeeze section, squeeze force control section)

42‧‧‧ take-up detector

44‧‧‧blower (air supply device)

46‧‧‧Open and close valve

48‧‧‧air nozzle

50‧‧‧Displacement mechanism

52‧‧‧Pressure Sensor

54‧‧‧Transfer roller

120‧‧‧ squeeze roller

130‧‧‧Roller driving unit

142‧‧‧ Fulcrum

144‧‧‧Boom

146‧‧‧cylinder

FIG. 1 is a schematic view of a winding device.

Fig. 2 is a flowchart showing a winding sequence.

FIG. 3 is a graph showing the relationship between the take-up amount of the film and the pressing force of the outer peripheral surface of the extruded film roll.

Fig. 4 is a schematic view of a winding device.

FIG. 1 shows a winding device 10 according to the present invention. The take-up device 10 is a person who takes up a film 14 produced by the film production device 12. The film manufacturing apparatus 12 manufactures the film 14 by the solution film-forming method, for example. In the solution film forming method, a dopant is prepared using the materials described below, and the prepared dopant is cast on an endless support to form a cast film. After the cast film is in a state of supporting itself, the cast film is peeled from the endless support, and the peeled cast film is dried by hot air or the like. Thereby, the film 14 is formed. In this embodiment, the thickness of the film 14 is set to be 10 μm or more and 60 μm or less.

The film 14 formed as described above is sent to the winding device 10 via the knurling roller 16. The knurling imparting roller 16 has minute irregularities formed on the outer peripheral surface, and the outer peripheral surface of the knurling roller 16 is pressed against the film 14 to form minute irregularities (knurling) on both sides (ear portions) in the width direction of the film 14. In this embodiment, the height of the unevenness formed by the knurling application roller 16 is set to be 2 μm or more and 20 μm or less.

The winding device 10 includes a winding core 18. The core 18 is rotatably supported by the turntable device 20. The turntable device 20 is provided with, for example, a motor 22 as a driving force supply unit that supplies a driving force for rotating the core 18. The motor 22 is driven and controlled by the control unit 30 to rotate, and the winding core 18 rotates around the shaft in accordance with the rotation. Thereby, the film 14 is wound around the winding core 18 (wound film 14), and the film roll 32 is formed. In this embodiment, the outer diameter of the core 18 is set to 15 cm or more and 50 cm or less. In the present embodiment, the winding amount (total winding amount) of the film 14 to be wound from the start of winding to the completion is set to 1000 m or more, and more specifically, 4000 m.

The film 14 is fed (transported) from the film manufacturing device 12 toward the winding device 10 at a constant speed. Therefore, the tension of the film 14 during winding is determined by the rotation speed and / or the rotation torque of the motor 22 (winding core 18). The control unit 30 controls the tension of the film 14 during winding by controlling the motor 22. In addition, although the tension of the film 14 during winding can be freely set, in this embodiment, the tension of the film 14 is controlled so that the tension at the start of winding is the highest, and the tension of the film 14 decreases as the winding amount of the film 14 increases. Take up.

In addition, the winding device 10 includes a pressing mechanism 40 (a pressing section and a pressing force control section). The pressing mechanism 40 has a function of pressing the outer peripheral surface of the film roll 32 toward the inside (the core 18 side) and a function of controlling the pressing force according to the winding amount of the film 14 (the length of the rolled film 14). It is also composed of a winding amount detector 42, a blower 44 (air supply device), an on-off valve 46, an air nozzle 48, a displacement mechanism 50, a pressure sensor 52, and the aforementioned control unit 30.

The take-up amount detector 42 detects the rotation amount of the conveyance roller 54 that rotates as the film 14 is conveyed to the core 18, and sends the detected information to the control unit 30. The control unit 30 detects the length of the film 14 sent to the winding core 18, that is, the winding amount of the film 14 based on the information transmitted from the winding amount detector 42.

The blower 44 sends air to the air nozzle 48 via the on-off valve 46. The on-off valve 46 is disposed in an air supply passage (not shown) connecting the blower 44 and the air nozzle 48, and is switched to an open state of the open air passage and a closed state of the closed air passage under the control of the control unit 30. Thereby, when the on-off valve 46 is in an open state, the wind (air sent from the blower 44) from the blower 44 is transmitted to the air nozzle 48. When the on-off valve 46 is in a closed state, the wind from the blower 44 is not transmitted to the air. Nozzle 48.

The air nozzle 48 is provided with a long slit-shaped air outlet in the width direction of the film 14, and is arranged with the air supply port facing the outer peripheral surface of the film roll 32. With this, when the on-off valve 46 is opened, the wind from the blower 44 is supplied from the air supply port toward the outer peripheral surface of the film roll 32, and the outer peripheral surface of the film roll 32 is pressed toward the inside (the core 18 side). In this embodiment, the air nozzle 48 (air supply port) is formed such that the length of the air supply port of the air nozzle 48 (the length in the width direction of the film 14) and the width of the film 14 are substantially equal.

The displacement mechanism 50 slides the air nozzle 48 in a direction approaching the outer peripheral surface of the film roll 32 and a direction away from the outer peripheral surface of the film roll 32 under the control of the control unit 30. The control unit 30 controls the displacement mechanism 50 based on the information from the take-up amount detector 42, that is, the take-up amount of the film 14 and the information corresponding to the outer diameter of the film roll 32, and maintains the air nozzle 48 (air supply port) at a constant distance. ) From the outer peripheral surface of the film roll 32. In this embodiment, the aforementioned constant distance is set to about 1 cm.

The pressure sensor 52 outputs a signal corresponding to the pressure in the air nozzle 48 to the control unit 30. As described above, the distance between the air nozzle 48 (air supply port) and the outer peripheral surface of the film roll 32 is maintained at a constant distance by the displacement mechanism 50. Therefore, the pressure in the air nozzle 48, that is, the pressure of the gas supplied from the air supply port to the outer peripheral surface of the film roll 32 corresponds to the pressing force for pressing the outer peripheral surface of the film roll 32. The control unit 30 controls the pressing force for pressing the outer peripheral surface of the film roll 32 by controlling the blower 44 based on a signal from the pressure sensor 52.

Hereinafter, specific control contents of the pressing force of the outer peripheral surface of the squeeze film roll 32 will be described based on FIGS. 2 and 3. The control unit 30 starts the winding by operating the motor 22 to start the rotation of the winding core 18, and maintains the on-off valve 46 in the process (the first winding process) from the start of winding to the passage of a predetermined first period. In the closed state, the pressing of the outer peripheral surface of the film roll 32 by the pressing mechanism 40 is prohibited, and after the first period has elapsed, the on-off valve 46 is switched to the open state to start the pressing.

In the present embodiment, the first period is set to a period from the start of winding up to the time when the film 14 is wound up to 5 to 100 m. As mentioned above, in this embodiment, the total winding amount of the film 14 is 4000 m. Therefore, the period from the start of winding to the time when the film 14 is wound to 5m to 100m corresponds to the period from the start of winding to the time when the film 14 is wound to 0.125% to 2.5% of the total winding amount. The length of the first period is not limited to this embodiment, but the first period is preferably a shorter period in the initial stage of winding. Specifically, the winding amount of the film 14 wound in the first period is preferably 3% or less of the total winding amount.

Further, in the present embodiment, the blower 44 is operated earlier than the time when the on-off valve 46 is switched to the open state, and air supply at a constant air volume is started. The working time of the blower 44 is not limited to this, and may be after the time when the on-off valve 46 is switched to the open state, but in this embodiment, the blower 44 is operated earlier than the on-off valve 46 is switched to the open state. This accompanies the switching of the on-off valve 46 to the open state to quickly obtain a desired pressing force (pressing force on the outer peripheral surface of the pressing film roll 32).

In addition, as described above, in the process (second winding process) from when the on-off valve 46 is switched to the open state and the outer peripheral surface of the film roll 32 is squeezed until a predetermined second period elapses, the control unit 30 The increase in the amount of winding increases the output of the blower 44, thereby increasing the pressing force of the outer peripheral surface of the squeeze film roll 32. In addition, in this embodiment, each time the coiling amount is increased by 1 m, the pressing force is increased within a range of 1% to 10% (a range of 1% to 10% of the final pressing force). Next, the pressing force is increased in proportion to the winding amount of the film 14. As described above, the pressing force is not applied in the first period, and the pressing force is increased with the increase in the winding amount in the second period, thereby preventing deformation failures such as transfer failure and corner winding failure.

In addition, in the present embodiment, the second period is a period during which a film 14 of 300 m is wound up together with the first period, that is, a period until 7.5% of the film 14 is wound up together with the first period. However, in the present invention, the total amount of the film 14 to be wound in the two periods of the first period and the second period may be 10% or less of the total amount of the coil. Therefore, the winding amount of the film 14 wound up in each of the first period and the second period is not limited to this embodiment, and can be appropriately changed within the above range.

In addition, the pressing force (pressing force of the outer peripheral surface of the squeeze film roll 32) applied after the second period has passed can be freely set, but in this embodiment, it is set to increase as the winding amount of the film 14 increases. The pressing force is reduced.

In addition, in this embodiment, the film 14 is wound up by straightly winding the side edges of the film 14 with respect to the first and second periods, and after the second period has passed, the side edges of the film 14 are made. The roll-up of the film 14 is performed by a wobble roll-up which is periodically shifted with respect to the width direction of the film 14 within a certain range. In addition, in the wobble winding, the wobble width, that is, the wobble width (the amount of shift when the film 14 is shifted in the width direction) can be arbitrarily set. In addition, in addition to being fixed at a constant value, the swing width can be gradually increased, decreased, or decreased after increasing.

In the above-mentioned embodiment, an example has been described in which the outer peripheral surface of the film 14 is squeezed by the blower air from the blower 44. However, the winding device 100 shown in FIG. 4 may also be squeezed by the squeeze roller 120. The outer peripheral surface of the laminated film 14. In addition, in the description using FIG. 4, the same reference numerals are given to the same components as those of the above-mentioned embodiment, and the description is omitted.

In FIG. 4, the winding device 100 includes a pressing mechanism 110 (a pressing unit and a pressing force control unit). The pressing mechanism 110 includes a winding amount detector 42, a pressing roller 120, a roller driving unit 130, and a control unit 140. The squeeze roller 120 is, for example, a rubber roller whose outer periphery is made of rubber, and is arranged parallel to the winding core 18. Further, in the present embodiment, it is mounted on the front end of the boom 144 that rotates around the fulcrum 142, and is movably supported between the squeeze position where the outer peripheral surface abuts the film roll 32 and the standby position separated from the film roll 32. between. In addition, in the present embodiment, the length of the squeeze roll (the length in the width direction of the film 14) is set to a range that includes the width of the knurling (the unevenness formed on both sides of the film 14) formed on the film 14. Within the length. This makes it possible to squeeze the widthwise central portion of the film 14 (the portion where the knurling is not formed).

The roller driving unit 130 moves the squeeze roller 120 by controlling the air pressure supplied to the air cylinder 146 connected to the boom 144, for example, and further moves toward the film roll 32 side by the squeeze roller 120 at the squeeze position. Air pressure is applied to the air cylinder 146, and the outer peripheral surface of the film roll 32 is pressed. The roller driving unit 130 includes a latch mechanism (not shown). The lock mechanism is for holding the squeeze roller 120 in a standby position. In a state where the squeeze roller 120 is locked in the standby position, even if the lock mechanism applies air pressure to the air cylinder 146, the outer peripheral surface of the film roll 32 will not be squeezed.

The control unit 140 controls the pressing force of the outer peripheral surface of the squeeze film roll 32 by controlling the roller driving unit 130. The pressing force is controlled in the same manner as the above-mentioned embodiment (see Figs. 2 and 3). Specifically, the pressing roller 120 is locked in the standby position in the first period, no pressing force is applied, and after the first period has elapsed, the pressing starts with the start of the second period. At this time, the control unit 140 applies air pressure to the air cylinder 146 before the start of the second period, and releases the lock to the standby position of the squeeze roller 120 with the start of the second period, thereby starting the squeeze. Thereby, a desired pressing force can be applied immediately after the start of the second period. In addition, the control unit 140 increases the pressing force during the second period as the winding amount increases. This makes it possible to prevent deformation failure (transfer failure, corner take-up failure) of the film 14 in the same manner as the above-described embodiment.

In addition, the pressing portion of the outer peripheral surface of the pressing film roll 32 need not be only one of the aforementioned blower 44 and the pressing roller 120, and may be both. Even when the outer peripheral surface of the film roll 32 is squeezed by both the blower 44 and the squeeze roller 120, the squeeze force is not applied in the first period, and the squeeze force is applied in the second period, thereby preventing the film Deformation failure of 14.

(Raw material)

In this embodiment, the doping solution is a polymer solution in which a polymer is dissolved in a solvent. In this embodiment, cellulose triacetate (hereinafter referred to as TAC) is used as the polymer, but other cellulose halides other than TAC may be used. The cellulose sulfonate may have only one kind of fluorene group, or may have two or more kinds of fluorene groups. When there are two or more kinds of fluorenyl groups, it is preferable that one of them is an ethenyl group. The ratio of hydroxyl group esterification of cellulose with a carboxylic acid, that is, the degree of substitution of a fluorenyl group satisfies all of the following formulae (I) to (III). In the following formulae (I) to (III), A and B represent the degree of substitution of the fluorenyl group, A is the degree of substitution of the ethenyl group, and B is the degree of substitution of the fluorenyl group having 3 to 22 carbon atoms.

(I) 2.0 A + B 3.0

(II) 1.0 A 3.0

(III) 0 B 2.0

The total substitution degree A + B of the fluorenyl group is more preferably 2.20 or more and 2.97 or less, and more preferably 2.40 or more and 2.88 or less. The degree of substitution B of the fluorenyl group having 3 to 22 carbon atoms is more preferably 0.30 or more, and more preferably 0.5 or more.

In addition, the polymer of the doping solution is not limited to a cellulose halide. For example, acrylic resin, cyclic olefin resin (for example, ARTON (registered trademark) manufactured by JSR Corporation), and the like can be used.

The doping solution may contain a polymer other than a polymer as a solid component of the film. Examples of the solid component other than the polymer include a plasticizer, an ultraviolet absorber, a retardation control agent, and fine particles. The plasticizer may be contained in the present embodiment. The fine particles are a so-called matting agent used for the purpose of imparting sliding properties and / or abrasion resistance to a film, or suppressing adhesion when a film is overlapped.

When the mass of the solid content is MK and the mass of the doping solution is set to MD, respectively, the proportion of the solid content in the doping solution (hereinafter referred to as the solid content content rate) is calculated by (MK / MD) × 100 The percentage is in the range of 14% to 25%, and this embodiment is 19.5%.

As the solvent of the doping solution, in this embodiment, a mixture of dichloromethane and methanol is used. The solvent is not limited to the examples of this embodiment, and for example, butanol, ethanol, and propanol are used, and these may be used in combination of two or more kinds.

Hereinafter, Examples 1 to 14 of the present invention will be described using Table 1 while comparing with Comparative Examples 1 to 3. The examples are those who apply the present invention to take-up, and the comparative examples are those who do not apply the present invention to perform take-up for comparison with the present invention.

In the examples and comparative examples, various conditions were changed, and a film with a volume of 4000 m was taken up to form a film roll. As various conditions, the core diameter (the diameter of the core), the film thickness (the thickness of the film), the pressing portion (in which way the outer peripheral surface of the film is pressed?), And the pressing start length (from the beginning of the winding) Take the length of the film wound up to the beginning of the extrusion), the increase rate of the extrusion force (the ratio of the increase in the extrusion force during the winding of the 1m film (the ratio of the increase in the extrusion force to the final extrusion force) , End of extrusion length (length of the film wound from the start of winding to the end of extrusion), Start of vibrating winding (when performing the rolling of winding, from the beginning of winding to the start of rolling of winding) The length of the film) and the swing width (the amount of vibration width of the film that shifts in the width direction when the wobble is taken up.) Table 1 shows various conditions of Examples 1 to 14 and Comparative Examples 1 to 3.

Further, the formed film roll was used to evaluate transfer failure and corner take-up failure. In the evaluation of the transfer failure, the film roll was stored in an environment of an air temperature of 25 ° C. and a humidity of 65% RH for 30 days. After that, the film was unrolled from the film roll, the film was observed with the naked eye from the core side, and the length of the film (the length from the core side) until the transfer failure disappeared was measured. In addition, whether or not the transfer failure has disappeared is determined by leaving the film on a work table covered with a black cloth, irradiating the film with the light of a fluorescent lamp, observing the reflected light with the naked eye, and checking for film deformation (transfer failure).

As a result of the determination, when the length of the film until the transfer failure disappeared was less than 30 m, the product was evaluated as “A” when it was at a good level. In addition, when the length of the film until the transfer failure disappears is 30 m or more and less than 50 m, the product is evaluated as "B" when it has a problem-free level. In addition, when the length of the film until the transfer failure disappeared was 50 m or more, when it was a problematic level as a product, it was evaluated as "C". In addition, regarding the transfer failure of Example 9, it is difficult to determine which of "A" and "B" should be evaluated. Therefore, the evaluation between "A" and "B" is set to "AorB".

On the other hand, in the evaluation of the angular winding failure, when the film roll was observed with the naked eye, when the outer peripheral shape (radial cross-section of the winding core) was circular, when the product was at a good level, the evaluation was "A". In addition, when the outer periphery is partially deformed but most of them are circular, it is evaluated as "B" when the product is at a level without problems. In addition, when a large part of the outer periphery is deformed, it is evaluated as "C" when it has a problematic level as a product.

Table 1 shows the evaluation of transfer failures and corner take-up failures in Examples 1 to 14 and Comparative Examples 1 to 3. As shown in Table 1, according to Examples 1 to 14 in which the present invention was implemented, it was confirmed that transfer failures and / or corner winding failures could be prevented by comparison with Comparative Examples 1 to 3 in which the present invention was not implemented.

Claims (12)

    A winding device for winding a film by winding a strip-shaped film around a winding core. The winding device includes a pressing part that presses a film roll generated by the winding toward the core side. An outer peripheral surface; and a pressing force control section that controls the pressing force with which the pressing section presses the film roll, and the pressing force control section prohibits the pressing from the start of the winding of the film until a predetermined first period elapses , The extrusion is started after the first period has passed, from the beginning of the extrusion until the prescribed second period, the pressing force increases with the increase in the amount of winding of the film, from the beginning of the winding to the passing The amount of winding of the film wound up to the first and second periods is 10% or less of the total amount of winding up from the start of winding to the end of winding.         For example, the coiling device of claim 1, wherein the total coiling amount is more than 1000m.         For example, if the winding device of item 1 or 2 is requested, the winding amount of the film wound during the first period is less than 3% of the total winding amount.         For example, the winding device of claim 1 or 2, wherein the increase in the pressing force during the second period is 1% / m or more and 10% / m or less.         For example, the winding device of claim 1 or 2, wherein the outer diameter of the core is 15 cm or more and 50 cm or less.         The winding device according to claim 1 or 2, wherein the film is formed with irregularities having a height of 2 μm or more and 20 μm or less on both sides.         The winding device according to claim 1 or 2, wherein the pressing portion includes a pressing roller, and the pressing is performed by pressing an outer peripheral surface of the pressing roller against an outer peripheral surface of the film roll.         The winding device according to claim 1 or 2, wherein the pressing portion is provided with an air supply device, and the pressing is performed by using the air supply device to supply air to an outer peripheral surface of the film roll.         If the winding device of item 1 or 2 is requested, during the first and second periods, the film is wound by straight winding with the side edges of the film aligned, after the second period has passed The rolling of the film is performed by periodically swinging the side edge of the film in a certain range with respect to the width direction of the film.         For example, the winding device of claim 1 or 2, wherein the thickness of the film can be 10 μm or more and 60 μm or less.         A take-up device as claimed in claim 1 or 2, wherein the film comprises a cellulose halide.         A winding method for winding a film by winding a tape-like film around a winding core. The winding method includes a first winding process from the beginning of winding of the film to a prescribed first time. In the processes up to this point, the film winding is performed in a state where the pressing by the pressing portion is prohibited, and the pressing portion presses the outer peripheral surface of the film roll generated by the winding toward the core side; And the second winding process is a process from the passage of the first period to the passage of a predetermined second period, and is performed while increasing the amount of winding of the film while increasing the pressing force by the pressing portion. The winding amount of the film is from 10% or less of the total winding amount of the film taken up from the beginning of the winding to the passage of the first and second periods. .