CN111148709B

CN111148709B - Winding device and winding method

Info

Publication number: CN111148709B
Application number: CN201880062908.1A
Authority: CN
Inventors: 铃木良明; 柏木和弘; 郡田亘
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2017-09-29
Filing date: 2018-09-21
Publication date: 2021-10-29
Anticipated expiration: 2038-09-21
Also published as: CN111148709A; KR20200044086A; WO2019065482A1; KR102391846B1; TW201919977A; JPWO2019065482A1; JP6831471B2; TWI753202B

Abstract

The invention provides a winding device and a winding method capable of preventing deformation failure of a film. Winding is started by starting rotation of the winding core (18), pressing of the outer peripheral surface of the film roll (32) by the pressing mechanisms (40, 110) is prohibited from the start of winding until the 1 st period elapses, and pressing of the outer peripheral surface of the film roll (32) is started after the 1 st period elapses. The pressing force for pressing the outer peripheral surface of the film roll (32) is increased as the amount of the film (14) wound up until the 2 nd period elapses after the start of pressing the outer peripheral surface of the film roll (32). The amount of the film (14) wound in the 1 st and 2 nd periods is 10% or less of the total amount of the film (14) wound from the start of winding to the end of winding.

Description

Winding device and winding method

Technical Field

The present invention relates to a winding apparatus and a winding method for winding a tape-like film around a winding core.

Background

As a method for producing a tape-like film, a solution film-forming method is widely known. The solution film-forming method is a method of forming a casting film by casting a dope solution in which a polymer such as cellulose acylate is dissolved in a solvent on a running casting support, forming a film by peeling the casting film from the casting support, and drying the formed film.

The film produced as described above is wound up by being wound around a winding core. Thereby forming a roll of film. When the film is wound, the thickness of the air layer formed between the films stacked on each other in the film roll is controlled by adjusting the tension of the film and/or pressing the outer peripheral surface of the film roll inward (see patent documents 1 to 4 below).

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. H04-106057

Patent document 2: japanese laid-open patent publication No. 60-128153

Patent document 3: japanese patent laid-open publication No. 2013-129540

Patent document 4: japanese laid-open patent publication No. 2010-150041

Disclosure of Invention

Technical problem to be solved by the invention

However, conventionally, deformation failures such as transfer failure and corner winding failure have occurred, and improvement is required. The transfer failure is a deformation failure that occurs when the thickness of the air layer is small and the degree of adhesion of the films stacked on the film roll is high, and occurs due to the transfer of the outer circumference of the roll core to the stacked films, such as the unevenness, the leading end, the trailing end, and the seam of the films. The corner winding failure is a deformation failure that occurs when the thickness of the air layer is large and the film adhesion degree is low in the film roll, and occurs because the outer periphery of the film roll cannot maintain a circular shape.

The present invention has been made in view of the above-described background, and an object thereof is to provide a winding apparatus and a winding method capable of preventing a deformation failure of a film.

Means for solving the technical problem

In order to achieve the above object, a winding apparatus according to the present invention winds a strip-shaped film around a winding core to perform winding of the film, the winding apparatus including: a pressing section that presses an outer peripheral surface of the film roll generated by winding toward the winding core side; and a pressing force control unit that controls a pressing force with which the pressing unit presses the film roll, wherein the pressing force control unit prohibits pressing until a predetermined 1 st period elapses from the start of winding of the film, starts pressing after the 1 st period elapses, increases the pressing force with an increase in the amount of winding of the film until a predetermined 2 nd period elapses from the start of pressing, and the amount of winding of the film from the start of winding until the 1 st and 2 nd periods elapses is 10% or less of the total amount of winding from the start of winding to the end of winding.

The total take-up can be above 1000 m.

The winding amount of the film wound during the 1 st period may be 3% or less of the total winding amount.

The increase in the pressing force during period 2 may be 1%/m or more and 10%/m or less.

The outer diameter of the winding core can be more than 15cm and less than 50 cm.

The film may have irregularities with a height of 2 μm or more and 20 μm or less on both side portions.

The pressing section may include a pressing roller, and presses the outer peripheral surface of the pressing roller against the outer peripheral surface of the film roll.

The pressing section may be provided with an air supply device, and perform pressing by supplying air to the outer peripheral surface of the film roll using the air supply device.

The film can be wound by straight winding in which the side edges of the film are aligned in the 1 st and 2 nd periods, and by oscillating winding in which the side edges of the film are periodically shifted within a certain range with respect to the width direction of the film after the 2 nd period.

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

The film may contain cellulose acylate.

In order to achieve the above object, a winding method according to the present invention is a winding method for winding a tape-like film around a winding core to thereby wind the film, the winding method including: a 1 st winding step of winding the film in a state where pressing by a pressing section that presses an outer peripheral surface of the film roll generated by winding toward a winding core side is prohibited, from when winding of the film is started to when a predetermined 1 st period elapses; and a 2 nd winding step of winding the film while increasing the pressing force by the pressing unit with an increase in the amount of winding of the film from the 1 st period to the 2 nd period, wherein the amount of winding of the film from the start of winding to the 1 st and 2 nd periods is 10% or less of the total amount of winding from the start of winding to the end of winding.

Effects of the invention

In the present invention, the 1 st period in which the outer peripheral surface of the film roll is not pressed and the 2 nd period in which the pressing force for pressing the outer peripheral surface of the film roll is increased with an increase in the amount of wound film are provided until the film of 10% of the total amount of wound film is wound, and therefore, the deformation failure of the film can be prevented.

Drawings

Fig. 1 is a schematic view of a reel-up.

FIG. 2 is a flowchart showing a winding procedure.

Fig. 3 is a graph showing the relationship between the amount of film taken up and the pressing force pressing the outer peripheral surface of the film roll.

Fig. 4 is a schematic view of a take-up device.

Detailed Description

Fig. 1 shows a winding apparatus 10 according to the present invention. The winding apparatus 10 winds the film 14 produced by the film producing apparatus 12. The film manufacturing apparatus 12 manufactures the film 14 by, for example, a solution film forming method. In the solution film-forming method, a dope solution is prepared from a raw material described later, and the prepared dope solution is cast on an endless support to form a casting film. After the casting film is in a self-supporting state, the casting film is peeled from the endless support, and the peeled casting film is dried by hot air or the like. Thereby forming film 14. In the present embodiment, the thickness of the film 14 is set to 10 μm or more and 60 μm or less.

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

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

The film 14 is supplied (conveyed) from the film producing device 12 toward the winding device 10 at a constant speed. Therefore, the tension of the film 14 at the time of winding is determined by the rotation speed and/or the rotation torque of the motor 22 (winding core 18). The controller 30 controls the motor 22 to control the tension of the film 14 during winding. Although the tension of the film 14 at the time of winding can be freely set, in the present embodiment, the tension of the film 14 is controlled so that the tension at the time of starting winding is the highest, and the tension is decreased as the amount of winding of the film 14 increases, thereby performing winding.

The winding apparatus 10 further includes a pressing mechanism 40 (pressing unit, pressing force control unit). The pressing mechanism 40 has a function of pressing the outer peripheral surface of the film roll 32 toward the inside (the roll core 18 side) and a function of controlling the pressing force in accordance with the amount of winding of the film 14 (the length of the wound film 14), and is configured by a winding amount detector 42, a blower 44 (air supply device), an opening/closing valve 46, an air nozzle 48, a displacement mechanism 50, a pressure sensor 52, and the aforementioned control unit 30.

The winding amount detector 42 detects the amount of rotation of the transport roller 54 that rotates as the film 14 is transported to the winding core 18, and transmits the detected information to the control unit 30. The control unit 30 detects the length of the film 14 fed to the winding core 18, that is, the amount of the film 14 wound, based on the information transmitted from the winding amount detector 42.

The blower 44 blows air toward the air nozzle 48 via the opening/closing valve 46. The on-off valve 46 is disposed in an air blowing passage (not shown) connecting the blower 44 and the air nozzle 48, and is switched between an open state for opening the air blowing passage and a closed state for closing the air blowing passage under the control of the control unit 30. Thus, when the on-off valve 46 is in the open state, the air from the blower 44 (the gas sent from the blower 44) reaches the air nozzle 48, and when the on-off valve 46 is in the closed state, the air from the blower 44 does not reach the air nozzle 48.

The air nozzle 48 has a slit-shaped air supply port that is long in the width direction of the film 14, and is disposed in a state in which the air supply port faces the outer peripheral surface of the film roll 32. Thus, in a state where the opening/closing valve 46 is open, the air 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 inward (toward the winding core 18). In the present 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) is substantially equal to the width of the film 14.

The displacement mechanism 50 slides the air nozzle 48 in a direction approaching the outer peripheral surface of the film roll 32 and in a direction separating from the outer peripheral surface of the film roll 32 under the control of the control unit 30. The controller 30 controls the displacement mechanism 50 based on the information from the winding amount detector 42, that is, the amount of the film 14 wound and the information corresponding to the outer diameter of the film roll 32, to maintain the distance between the air nozzle 48 (air supply port) and the outer peripheral surface of the film roll 32 at a constant distance. In the present embodiment, the 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 gas supply port to the outer peripheral surface of the film roll 32 corresponds to the pressing force that presses the outer peripheral surface of the film roll 32. The control unit 30 controls the blower 44 to control the pressing force for pressing the outer peripheral surface of the film roll 32 in accordance with the signal from the pressure sensor 52.

Hereinafter, specific control contents of the pressing force for pressing the outer peripheral surface of the film roll 32 will be described with reference to fig. 2 and 3. The controller 30 starts winding by starting rotation of the winding core 18 by operating the motor 22, and in a step (1 st winding step) from the start of winding until a predetermined 1 st period elapses, the opening/closing valve 46 is maintained in the closed state, so that pressing of the outer peripheral surface of the film roll 32 by the pressing mechanism 40 is prohibited, and after the 1 st period elapses, the opening/closing valve 46 is switched to the open state to start pressing.

In the present embodiment, the 1 st period is a period from the start of winding to the time when the film 14 is wound to 5 to 100 m. As described above, in the present embodiment, the total take-up amount of the film 14 is 4000 m. Therefore, the period from the start of winding to the winding of the film 14 to 5m to 100m corresponds to the period from the start of winding to the winding of the film 14 to 0.125% to 2.5% of the total winding amount. The length of the 1 st period is not limited to the present embodiment, but the 1 st period is preferably a short period in the initial stage of winding. Specifically, the winding amount of the film 14 wound in the 1 st period is preferably 3% or less of the total winding amount.

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 blowing at a constant air volume is started. The operation time of the blower 44 is not limited to this, and may be after the timing of switching the on-off valve 46 to the open state, but as in the present embodiment, the desired pressing force (pressing force that presses the outer peripheral surface of the film roll 32) is quickly obtained as the on-off valve 46 is switched to the open state by operating the blower 44 earlier than the timing of switching the on-off valve 46 to the open state.

As described above, in the step (2 nd winding step) from the start of pressing the outer peripheral surface of the film roll 32 after the on-off valve 46 is switched to the open state until the predetermined 2 nd period elapses, the control unit 30 increases the pressing force pressing the outer peripheral surface of the film roll 32 by increasing the output of the blower 44 in accordance with the increase in the winding amount of the film 14. In the present embodiment, the pressing force is increased in proportion to the amount of winding of the film 14 in a state where the pressing force is increased in a range of 1% to 10% (a range of 1% to 10% of the finally applied pressing force) per 1m increase in the amount of winding. In this way, the pressing force is not applied in the 1 st period, and the pressing force is increased with an increase in the take-up amount in the 2 nd period, whereby deformation failures such as transfer failure and corner take-up failure can be prevented.

In the present embodiment, the 2 nd period is a period during which 300m of the film 14 is wound together with the 1 st period, that is, a period until 7.5% of the total wound amount of the film 14 is wound together with the 1 st period. In the present invention, the total amount of the film 14 wound in both the 1 st period and the 2 nd period may be 10% or less of the total amount of winding. Therefore, the amount of the film 14 wound in each of the 1 st period and the 2 nd period is not limited to the present embodiment, and can be appropriately changed within the above range.

The pressing force applied after the 2 nd period (pressing force for pressing the outer peripheral surface of the film roll 32) can be freely set, but in the present embodiment, the pressing force is decreased as the amount of the film 14 wound increases.

In the present embodiment, in the 1 st and 2 nd periods, the film 14 is wound by the straight winding of the side edge of the alignment film 14, and after the 2 nd period, the film 14 is wound by the swing winding in which the side edge of the film 14 is periodically shifted within a certain range with respect to the width direction of the film 14. In the swing winding, the swing width (the amount of shift when the film 14 is shifted in the width direction), which is the swing width, can be set arbitrarily. Also, the swing width may be gradually increased, decreased, or decreased after being increased, in addition to being fixed at a constant value.

In addition, although the above embodiment has been described with an example in which the outer peripheral surface of the film 14 is pressed by the air blown from the blower 44, the outer peripheral surface of the film 14 may be pressed by the pressing roll 120 as in the winding apparatus 100 shown in fig. 4. In the explanation with reference to fig. 4, the same components as those of the above-described embodiment are given the same reference numerals, and the explanation thereof is omitted.

In fig. 4, the winding apparatus 100 includes a pressing mechanism 110 (pressing unit, pressing force control unit). The pressing mechanism 110 is composed of a winding amount detector 42, a pressing roller 120, a roller driving unit 130, and a control unit 140. The pressing roller 120 is, for example, a rubber roller whose outer periphery is formed of rubber, and is arranged in parallel with the winding core 18. In the present embodiment, the movable arm 144 is attached to the tip of the arm that pivots about the fulcrum 142, and is movably supported between a pressing position where the outer peripheral surface is brought into contact with the film roll 32 and a standby position where the movable arm is separated from the film roll 32. In the present embodiment, the length of the squeeze roller (the length in the width direction of the film 14) is set to a length that falls within the width of the knurls formed on the film 14 (the irregularities formed on both side portions of the film 14). This enables the film 14 to be pressed at the widthwise central portion (the portion where the knurling is not formed).

The roller driving unit 130 moves the squeeze roller 120 by controlling, for example, air pressure supplied to the air cylinder 146 connected to the arm 144, and applies air pressure to the air cylinder 146 in a state where the squeeze roller 120 at the squeeze position is further moved toward the film roll 32, thereby squeezing the outer peripheral surface of the film roll 32. The roller driving unit 130 includes a lock mechanism (not shown). The lock mechanism is a mechanism for locking and holding the pressing roller 120 at the standby position. In a state where the pressing roller 120 is locked at the standby position, the lock mechanism does not press the outer peripheral surface of the film roll 32 even if air pressure is applied to the air cylinder 146.

The control section 140 controls the pressing force that presses the outer peripheral surface of the film roll 32 by controlling the roller driving section 130. The pressing force is controlled as in the above-described embodiment (refer to fig. 2, 3). Specifically, the pressing roller 120 is locked at the standby position in the 1 st period, and the pressing force is not applied, and after the 1 st period has elapsed, the pressing is started with the start of the 2 nd period. At this time, the control unit 140 starts the squeezing by applying air pressure to the air cylinder 146 before starting the 2 nd period and releasing the lock to the standby position of the squeeze roller 120 with the start of the 2 nd period. Thereby, the desired pressing force can be applied immediately after the start of the 2 nd period. Then, the control unit 140 increases the pressing force with an increase in the take-up amount in the 2 nd period. Thereby, as in the above-described embodiment, deformation failure (transfer failure, corner winding failure) of the film 14 can be prevented.

The pressing portion that presses the outer peripheral surface of the film roll 32 need not be only one of the blower 44 and the pressing roll 120, but may be both. Even in the case where the outer peripheral surface of the film roll 32 is pressed by both the blower 44 and the pressing roller 120, the pressing force is not applied during the 1 st period, but is applied during the 2 nd period, whereby the deformation failure of the film 14 can be prevented.

(raw materials)

In this embodiment, the dope is a polymer solution in which a polymer is dissolved in a solvent. In the present embodiment, cellulose triacetate (hereinafter referred to as TAC) is used as the polymer, but other cellulose acylate than TAC may be used. The cellulose acylate may have only one kind of acyl group, or may have 2 or more kinds of acyl groups. When the acyl group is 2 or more, 1 of them is preferably an acetyl group. The ratio of hydroxyl groups of cellulose esterified with carboxylic acid, that is, the degree of substitution with acyl groups preferably satisfies all of the following formulae (I) to (III). In the formulae (I) to (III), A and B represent the degree of substitution with acyl groups, A represents the degree of substitution with acetyl groups, and B represents the degree of substitution with acyl groups 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 degree of substitution a + B of acyl groups is more preferably 2.20 to 2.97, and particularly preferably 2.40 to 2.88. The degree of substitution B of an acyl group having 3 to 22 carbon atoms is more preferably 0.30 or more, and particularly preferably 0.5 or more.

The polymer of the dope is not limited to the cellulose acylate. For example, an acrylic resin, a cyclic olefin resin (for example, ARTON (registered trademark) manufactured by JSR Corporation), or the like can be used.

The dope solution may contain a solid component other than the polymer as a solid component to be a film. Examples of the solid component other than the polymer include a plasticizer, an ultraviolet absorber, a retardation controller, and fine particles. The fine particles are a so-called matting agent used for the purpose of imparting slidability and/or scratch resistance to a film, suppressing adhesion when a film is stacked, or the like.

When MK is the mass of the solid content and MD is the mass of each dope, the proportion of the solid content in the dope (hereinafter referred to as the solid content percentage) is in the range of 14% to 25% as a percentage determined by (MK/MD) × 100, and 19.5% in the present embodiment.

As a solvent of the dope, in the present embodiment, a mixture of dichloromethane and methanol is used. The solvent is not limited to the examples of the present embodiment, but butanol, ethanol, propanol, and the like are used, for example, and 2 or more kinds of these may be used in combination as a mixture.

Examples 1 to 14 of the present invention will be described below in comparison with comparative examples 1 to 3 with table 1. The examples are examples in which the present invention is applied to winding, and the comparative examples are examples in which the present invention is not applied to winding in order to compare with the present invention.

[ Table 1]

In the examples and comparative examples, the film was wound up by 4000m under various conditions to form a film roll. As various conditions, the roll core diameter (diameter of the roll core), the film thickness (thickness of the film), the pressing section (which manner is used to press the outer peripheral surface of the film roll. The conditions of examples 1 to 14 and comparative examples 1 to 3 are shown in Table 1.

Then, the formed film roll was used to evaluate the transfer failure and the corner winding failure. For the evaluation of the transfer failure, the film roll was stored for 30 days under an atmosphere of 25 ℃ and 65% RH humidity. After that, the film was rewound from the film roll, and the length of the film (the length from the roll core side) until the transfer failure disappeared was measured by visually observing the film from the roll core side. Whether or not the transfer failure has disappeared is determined by standing the film on a table covered with black cloth, irradiating the film with light from a fluorescent lamp, observing the reflected light with the naked eye, and checking the presence or absence of deformation of the film (transfer failure).

As a result of the determination, when the length of the film until the transfer failure disappeared was less than 30m, the product was rated as a good grade and evaluated as "a". When the length of the film until the transfer failure disappeared was 30m or more and less than 50m, the product was rated as "B" as a product having no problem. When the length of the film until the transfer failure disappeared was 50m or more, the commercial product was evaluated as "C". In addition, since it is difficult to determine which of "a" and "B" the evaluation should be made with respect to the transfer failure in example 9, the evaluation between "a" and "B" is made to be "AorB".

On the other hand, in the evaluation of the corner winding failure, when the film roll was visually observed and the outer peripheral shape (the cross section in the radial direction of the winding core) was circular, the product was evaluated as "a" as a good grade. Further, when the outer periphery is partially deformed but mostly rounded, the product is rated as "B" as a product without any problem. In addition, when most of the outer periphery was deformed, the grade of the product was evaluated as "C" as a level having a problem.

The evaluation of the transfer failure and the corner winding failure in examples 1 to 14 and comparative examples 1 to 3 are shown in Table 1. As shown in table 1, it was confirmed that the transfer failure and/or the corner winding failure can be prevented in examples 1 to 14 in which the present invention was carried out, as compared with comparative examples 1 to 3 in which the present invention was not carried out.

Description of the symbols

10. 100-take-up device, 12-film manufacturing device, 14-film, 16-knurl imparting roller, 18-winding core, 20-turret device,

22-motor, 30, 140-control part, 32-film roll, 40, 110-extruding mechanism (extruding part, extruding force control part), 42-coiling amount detector, 44-blower (air supply device), 46-opening and closing valve, 48-air nozzle, 50-displacement mechanism, 52-pressure sensor, 54-conveying roller, 120-extruding roller, 130-roller driving part, 142-fulcrum, 144-movable arm and 146-air cylinder.

Claims

1. A winding device for winding a band-shaped film around a winding core,

the winding device is provided with:

a pressing section that presses an outer peripheral surface of the film roll generated by the winding toward the winding core side; and

a pressing force control section that controls a pressing force with which the pressing section presses the film roll,

the pressing force control unit prohibits the pressing until a predetermined 1 st period elapses from the start of the winding of the film, and starts the pressing after the 1 st period elapses,

increasing the pressing force with an increase in the amount of the film taken up from the start of the pressing until a predetermined 2 nd period elapses,

the amount of the film wound from the start of winding to the 1 st and 2 nd periods is 10% or less of the total amount of the film wound from the start of winding to the end of winding.

2. The take-up apparatus according to claim 1,

the total winding amount is more than 1000 m.

3. The take-up apparatus according to claim 1,

the winding amount of the film wound during the 1 st period is 3% or less of the total winding amount.

4. The take-up apparatus according to claim 2,

5. The take-up apparatus according to claim 1,

the increase of the pressing force in the period 2 is 1%/m or more and 10%/m or less.

6. The take-up apparatus according to claim 2,

7. The take-up apparatus according to claim 3,

8. The take-up apparatus according to claim 4,

9. The take-up device according to any one of claims 1 to 8,

the outer diameter of the winding core is more than 15cm and less than 50 cm.

10. The take-up device according to any one of claims 1 to 8,

the film has irregularities with a height of 2-20 [ mu ] m formed on both sides.

11. The take-up device according to any one of claims 1 to 8,

the squeezing unit includes a squeezing roller, and the squeezing is performed by pressing an outer peripheral surface of the squeezing roller against an outer peripheral surface of the film roll.

12. The take-up device according to any one of claims 1 to 8,

the squeezing unit includes an air supply device, and performs squeezing by supplying air to the outer peripheral surface of the film roll using the air supply device.

13. The take-up device according to any one of claims 1 to 8,

the winding of the film is performed by straight winding with the side edges of the film aligned in the 1 st and 2 nd periods,

after the 2 nd period has elapsed, the winding of the film is performed by swing winding periodically shifted by the side edge of the film within a certain range with respect to the width direction of the film.

14. The take-up device according to any one of claims 1 to 8,

the thickness of the film is 10 [ mu ] m or more and 60 [ mu ] m or less.

15. The take-up device according to any one of claims 1 to 8,

the film contains cellulose acylate.

16. A winding method for winding a tape-like film around a winding core to thereby wind the film, the winding method comprising:

a 1 st winding step of winding the film in a state where pressing by a pressing section that presses an outer peripheral surface of a film roll generated by the winding toward the winding core side is prohibited, from when the winding of the film is started to when a predetermined 1 st period elapses; and

a 2 nd winding step of winding the film while increasing the pressing force by the pressing section in accordance with an increase in the amount of the film to be wound, from the 1 st period to a predetermined 2 nd period,

the amount of the film wound from the start of the winding to the elapse of the 1 st and 2 nd periods is 10% or less of the total amount of the film wound from the start of the winding to the end of the winding.