JP2002220143A - Method and device for winding high polymer film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wind a high polymer film without causing a defect such as winding deviation. SOLUTION: The high polymer film 27 is conveyed in the arrow B direction. A winding core 11 rotates in the arrow A direction to wind the high polymer film 27 sequentially. A tension sensor 17 measures a winding tension of the high polymer film 27 through a tension measuring roll 16. A controller 25 adjusts a winding tension by moving a dancer roll 18 in the arrow C direction through a dancer mechanism 19 to obtain a predetermined winding tension based on a thickness, winding speed, winding length wound around the winding core 11, and whole winding length of the high polymer film 27. A pressing mechanism 15 presses a rayon roll 14 against the high polymer film 27 by a predetermined pressing force based on the thickness of the high polymer film 27, thereby winding the high polymer film 27 without causing defects such as winding deviation, winding line, and winding wrinkle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for winding a polymer film, and more particularly, to a method and an apparatus for winding a polymer film without causing a problem such as a misalignment of the polymer film. Things.

[0002]

2. Description of the Related Art As a method for producing a polymer film such as cellulose triacetate, polycarbonate and cellophane, a solution casting method is generally known. In this solution casting method, each polymer solution is cast on a support consisting of a continuously rotating endless band or drum, and dried by a drying air or the like, and then the polymer film is removed from the support. A film is formed by peeling. The polymer film peeled from the support, if necessary,
After being stretched in the width direction and further dried, it is sent to a winding device and wound around a core.

At this time, in order to prevent air from being caught between the polymer film already wound on the core and the polymer film to be wound, a predetermined winding tension is applied to the polymer film. And wind it around the core. Conventionally, the winding tension is reduced as the winding becomes thicker, without depending on the thickness or the winding speed of the polymer film.

[0004]

However, in the conventional method and apparatus for winding a polymer film, if the winding tension is too low, the content of air entrained between the wound polymer films increases. Winding deviation is easy to occur. Conversely, if the winding tension is too high, the winding pressure will increase, and the difference in thickness of the polymer film will be emphasized, causing streak-like deformation and winding wrinkles due to unevenness. Further, as the polymer film becomes thinner, longer, and faster in winding, the above-mentioned problems cannot be solved by the conventional winding method, and the product yield is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a high-molecular film which is free from defects such as winding deviation, winding streaks and winding wrinkles when winding a polymer film around a winding core. An object of the present invention is to provide a method and an apparatus for winding a molecular film.

[0006]

In order to achieve the above object, a method and an apparatus for winding a polymer film according to the present invention are provided.
In the method of winding a polymer film around a core while nipping the polymer film with a laion roll, the polymer film is wound around the core with a predetermined winding tension according to the thickness and the winding speed of the polymer film. At the beginning, the polymer film is wound while pressing the ion roll toward the core with a predetermined pressing force according to the thickness of the polymer film.

When the polymer film is being wound on the core, the reduction rate of the winding tension is determined according to the thickness of the polymer film and the total length of the polymer film wound on the core. According to the present invention, the polymer film is wound while the winding tension is reduced in accordance with the above-mentioned reduction rate in accordance with the length of the polymer film already wound on the core.

[0008] It is preferable to control the pressing force of the raion roll within the range shown by the following equation. t / 25 ≦ P ≦ t / 5 where P is a pressing force and is expressed in units of kgf / m width, and t is a thickness of the polymer film and expressed in units of μm.

It is preferable to control the winding tension at the start of winding the polymer film on the winding core within the range shown by the following equation. t × V / 300 ≦ Ts ≦ t × V / 300 + 30 Here, Ts is a winding tension when the polymer film starts to be wound around the core, and is expressed in units of kgf / m width,
t is the thickness of the polymer film, expressed in units of μm, and V is the winding speed of the polymer film, expressed in units of m / min.

[0010] It is preferable to control the reduction rate of the winding tension within the range shown by the following equation. When T = Ts−α × Lb, t / (10 × La) ≦ α ≦ t / (2 × La) where T is a winding tension during winding of the polymer film,
Ts is the winding tension at the beginning of winding and is expressed in units of kgf / m width, α is the reduction rate of the winding tension, Lb is the winding length of the wound polymer film, and La is the winding length. The total length of the polymer film wound around the core, expressed in units of m.

In a polymer film winding device for winding a polymer film around a core while nipping the polymer film with a laion roll, a pressing means for pressing the laion roll toward the core and a winding tension of the polymer film are set. A tension detecting means for detecting, and a control means for controlling a pressing force by the pressing means in accordance with the thickness of the polymer film and controlling a winding tension based on a result detected by the tension detecting means. (Kgf / m width) and the thickness of the polymer film is t (μ
m), the pressing force P is controlled within the range of t / 25 ≦ P ≦ t / 5. In addition, when starting to wind the polymer film around the core, the winding tension when starting to wind the polymer film around the core is Ts (kgf / m width), the thickness of the polymer film is t (μm), When the winding speed of the polymer film is V (m / min), t × V / 300 ≦ T
The winding tension Ts is controlled in the range of s ≦ t × V / 300 + 30.

[0012]

FIG. 1 is a schematic view showing the structure of a film winding machine. The film winding machine 10 includes the core 1
1, a gantry 12, a motor 13, a raion roll 14, a pressing mechanism 15, a tension measuring roll 16, a tension sensor 17, a dancer roll 18, a dancer mechanism 19, a guide roll 20, and a controller 25.

The core 11 is rotatably held by a gantry 12 and is driven to rotate by a motor 13. The controller 20 controls the rotation of the motor 13, and controls the rotation of the polymer film 27.
The core 11 is rotated in the direction of arrow A so that is wound at a predetermined winding speed. By this rotation, the polymer film 27 is sequentially wound around the winding core 11. The polymer film 27 is produced by a solution casting apparatus (not shown), and is conveyed in the direction of arrow B through a stretching apparatus and a drying apparatus provided as necessary.

A tension measuring roll 16, a dancer roll 18, and a guide roll 20 are arranged in the middle of the transport path of the polymer film 27. Tension measuring roll 1
A tension sensor 17 is connected to 6. Further, the dancer roll 18 is provided with a dancer mechanism 19 for moving the dancer roll 18 in the direction of arrow C. Tension sensor 1
7 is a polymer film 27 via the tension measuring roll 16.
Measure the winding tension. The measured winding tension is input to the controller 25. The controller 25 adjusts the winding tension of the polymer film 27 by moving the dancer roll 18 in the direction of arrow C via the dancer mechanism 19 based on the measurement result.

At the beginning of the winding of the polymer film 27, the thickness of the polymer film 27 is t (μm), and the winding speed is V (m).
/ Min) and the winding tension at the beginning of winding is Ts (kgf /
m width), the controller 25 controls the tension sensor 17
The dancer roll 18 is moved in the direction C in the figure via the dancer mechanism 19 on the basis of the measurement result input from, so that the winding tension Ts becomes a value set within the range shown by the following equation (1). While winding the polymer film 27. t × V / 300 ≦ Ts ≦ t × V / 300 + 30 (1)

Here, the winding tension Ts at the start of winding is:
If it exceeds the range of the above-mentioned formula (1), problems such as winding streaks and wrinkles will occur. If it does not reach the range of the above-mentioned formula (1), insufficient winding pressure will cause problems such as winding misalignment.

During the winding of the polymer film 27, the winding tension during the winding is T (kgf / m width), the total winding length of the polymer film 27 is La (m), and the winding core 11 is already wound. The winding length of the taken polymer film 27 is set to Lb.
(M), assuming that the reduction rate of the winding tension is α, the controller 25 determines the reduction rate α within the range represented by the following equation (2), the winding tension Ts at the start of winding, and the winding of the polymer film 27. Based on the length Lb, the winding tension T at the present time during winding is obtained as shown in the following equation (3). Then, the controller 25 moves the dancer roller 18 in the direction C in the drawing and winds the polymer film 27 while adjusting the winding tension T in the same manner as described above. t / (10 × La) ≦ α ≦ t / (2 × La) (2) T = Ts−α × Lb (3)

Here, if the reduction rate α of the winding tension exceeds the range of the above formula (2), the winding pressure becomes insufficient, causing a problem such as a winding deviation, and if it does not reach the range of the above formula (2). The winding pressure becomes excessive, causing defects such as winding streaks and winding wrinkles.

The ion roll 14 has a rotation axis parallel to the rotation axis of the core 11 and contacts the polymer film 27 wound on the core 11. The raion roll 14 is provided with a pressing mechanism 15. The pressing mechanism 15 is controlled by the controller 25 and presses the raion roller 14 against the core 11 with a predetermined pressing force. Thereby, the squeezing efficiency of the air entrained in the polymer film 27 wound on the core 11 is increased, and the air content can be reduced.

The controller 25 includes a polymer film 27
When the thickness is t (μm) and the pressing force is P (kgf / m width), the pressing force P of the raion roll 14 is adjusted so as to be a value set within the range shown by the following expression (4). I do. t / 25 ≦ P ≦ t / 5 (4)

If the pressing force P exceeds the range of the above formula (4), problems such as winding streaks and wrinkles occur. Inconveniences such as winding deviation occur.

As described above, when the film winding machine 10 starts winding the polymer film 27, the winding tension is adjusted to the winding tension T according to the thickness t and the winding speed V of the polymer film 27.
The winding of the polymer film 27 is started while adjusting to s.
A pressing force P corresponding to the thickness t of the polymer film 27 is obtained.
While pressing the ion roll 14 toward the core 11, the polymer film already wound on the core 11 at a reduction rate α of the winding tension corresponding to the thickness t of the polymer film 27 and the total winding length La. Since the polymer film 27 is wound while the winding tension T is reduced according to the winding length Lb of the film 27, the film roll 30 can be formed without causing problems such as winding deviation, winding streaks, and winding wrinkles. .

The thickness t of the polymer film 27 is 10
To 300 μm, more preferably 30 to 150 μm.
μm. The winding speed V is 10 to 300 m / min.
Is more preferable, and more preferably 30 to 200 m / min. Further, the total winding length of the polymer film 27 is 1000
It is preferably from 10,000 to 10,000 m, more preferably from 1,000 to 10,000 m
5000 m.

[0024]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.

<Film Roll Quality Evaluation Method> The appearance of the film roll 30 in which the winding of the polymer film 27 has been completed is visually observed, and it is determined whether or not each of defects such as a winding deviation, a winding line, and a wrinkle has occurred. Was evaluated as follows. ：: No defect was found ×: Defect was found

Example 1 The thickness was 50 μm and the width was 15
00 mm cellulose triacetate film (hereinafter, referred to as
TAC film) was wound around a core 11 having a diameter of 200 mm using a film winding machine 10. At this time, the winding speed V was 50,100 (m / min), the total winding length La was 2500,4000 (m), and the winding tension Ts at the start of winding was 10, 15, 20, 30, 30, 35, 40 (kgf /
m width), and the pressing force P of the laion roll 14 is 1, 5, 12
(Kgf / m width), reduction rate α of winding tension is 1/100
It was wound as 0, 1/500, 1/250, 1/150.

The winding conditions of Examples 1-1 to 1-10 are shown in Table 1, and the evaluation results of Examples 1-1 to 1-10 are shown in Table 2.

[0028]

[Table 1]

[0029]

[Table 2]

<Results> In Examples 1-2 and 1-3, the pressing force by the raion roller 14 was insufficient or excessive. In Examples 1-5 and 1-7, the winding tension was insufficient or excessive. In Examples 1-9 and 1-10, the film tension was insufficient or excessive, and thus the film roll 30 was found to have a winding deviation, a winding streak, and a winding wrinkle. In contrast, in Examples 1-1, 1-4, 1-6 and 1-8, no inconvenience was observed.

Example 2 The thickness was 80 μm and the width was 15
A 00 mm TAC film was wound around a 200 mm diameter core 11 using a film winder 10. At this time, the winding speed V was 50,100 (m / min), and the winding tension Ts at the start of winding was 20, 30, 40, 60 (kgf /
m width), and the reduction rate α of the winding tension is 1/300, 1/20
It was wound up as 0, 1/100. The total winding length La is 2500 (m), and the pressing force P of the raion roll 14 is 8
(Kgf / m width).

Table 3 shows the winding conditions of Examples 2-1 to 2-4, and Table 4 shows the evaluation results of Examples 2-1 to 2-4.
It was shown to.

[0033]

[Table 3]

[0034]

[Table 4]

<Results> In Examples 2-3 and 2-4, the film roll 3
At 0, a winding shift, a winding streak, and a winding wrinkle were observed. In contrast, in Examples 2-1 and 2-2, no problem was observed.

Example 3 The thickness was 120 μm and the width was 1
A 500 mm TAC film is wound into a film winding machine 10.
And wound around a core 11 having a diameter of 200 mm. At this time, the winding speed V is 50,100 (m / min), the total winding length La is 2500,4000 (m), the winding tension Ts at the start of winding is 40,50 (kgf / m width), The winding was performed at a pressure P of 4,10 (kgf / m width) and a reduction rate α of the winding tension of 1/200, 1/100.

The winding conditions of Examples 3-1 to 3-4 are shown in Table 5, and the evaluation results of Examples 3-1 to 3-4 are shown in Table 6.
It was shown to.

[0038]

[Table 5]

[0039]

[Table 6]

<Results> In Example 3-4, since the pressing force of the laion roll 14 was insufficient, the film roll 30
In addition, a winding gap was observed. On the other hand, Example 3-1
In 3-2 and 3-3, no defect was observed.

[0041]

As described above, according to the method for winding a polymer film of the present invention, the polymer film is wound around a core with a predetermined winding tension in accordance with the thickness and the winding speed of the polymer film. At first, the raion roll was rolled while pressing against the core with a predetermined pressing force according to the thickness of the polymer film, so that there was no problem such as misalignment, winding streaks, winding wrinkles, etc. The film can be wound up.

During the winding of the polymer film on the core, the reduction rate is determined according to the thickness of the polymer film and the total length of the polymer film wound on the core, and the winding is already performed on the core. The polymer film is wound up while reducing the winding tension according to the winding length of the polymer film being taken, so that there are no problems such as misalignment, winding streaks, winding wrinkles, etc. Can be wound up.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a configuration of a film winder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Film winding machine 11 Core 12 Frame 13 Motor 14 Ray roll 15 Pressing mechanism 16 Tension measuring roll 17 Tension sensor 18 Dancer roll 19 Dancer mechanism 20 Guide roll 25 Controller 27 Polymer film 30 Film roll

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masayuki Kawaharada 210 Nakanakanuma, Minamiashigara-shi, Kanagawa Prefecture Fuji Photo Film F-term (reference) 3F055 AA05 CA01 DA01 EA02 3F105 AA04 BA03 BA04 DA02 DA04 DA09

Claims (7)

[Claims] 1. A method for winding a polymer film around a core while nipping the polymer film with a laion roll, wherein the high film is wound at a predetermined winding tension according to a thickness and a winding speed of the polymer film. Starting to wind a molecular film around the core, and winding the polymer film while pressing the rayon roll toward the core with a predetermined pressing force according to the thickness of the polymer film. A method for winding a molecular film. 2. The reduction rate of the winding tension is determined according to the thickness of the polymer film and the total length of the polymer film wound on the core, and the reduction rate of the winding tension is determined based on the thickness of the polymer film wound on the core. 2. The method according to claim 1, wherein the polymer film is wound while the winding tension is reduced by the reduction rate according to the length of the polymer film. 3. The method for winding a polymer film according to claim 1, wherein the pressing force of the raion roll is controlled within a range represented by the following equation. t / 25 ≦ P ≦ t / 5 where P is the pressing force of the raion roll and is expressed in kgf /
It is expressed in units of m width, and t is the thickness of the polymer film, expressed in units of μm. 4. The method according to claim 1, wherein the winding tension at the time of starting winding the polymer film around the core is controlled within a range represented by the following equation. A method for winding a polymer film. t × V / 300 ≦ Ts ≦ t × V / 300 + 30 Here, Ts is a winding tension when the polymer film starts to be wound around the core, and is expressed in units of kgf / m width,
t is the thickness of the polymer film, expressed in units of μm, and V is the winding speed of the polymer film, expressed in units of m / min. 5. The method for winding a polymer film according to claim 2, wherein a reduction rate of the winding tension is controlled within a range represented by the following equation. When T = Ts−α × Lb, t / (10 × La) ≦ α ≦ t / (2 × La) where T is a winding tension during winding of the polymer film,
Ts is the winding tension at the beginning of winding and is expressed in units of kgf / m width, α is the reduction rate of the winding tension, Lb is the winding length of the wound polymer film, and La is the winding length. The total length of the polymer film wound around the core, expressed in units of m. 6. A polymer film take-up device for winding a polymer film around a core while nipping the polymer film with a laion roll, comprising: pressing means for pressing the raion roll toward the core; and the polymer film. Tension detecting means for detecting the winding tension of the film, and control means for controlling the pressing force of the pressing means in accordance with the thickness of the polymer film, and controlling the winding tension based on the result detected by the tension detecting means. Wherein, when the pressing force is P (kgf / m width) and the thickness of the polymer film is t (μm), the pressing force P is controlled in a range of t / 25 ≦ P ≦ t / 5. A film winding device for a polymer film. 7. When the polymer film starts to be wound around the core, the winding tension when starting to wind the polymer film around the core is Ts (kgf / m width), and the thickness of the polymer film is Is t (μm), and the winding speed of the polymer film is V
(M / min), t × V / 300 ≦ Ts ≦
7. The winding device for a polymer film according to claim 6, wherein the winding tension Ts is controlled within a range of t * V / 300 + 30.