JP2003211467A - Method for forming film by casting solution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, for manufacturing a cellulose ester film or a norbornene resin film, which is free from the generation of a chain-state trouble and a knick defect, with regard to a best-suited cellulose ester as a protecting film for a polarizing sheet or a best-suited norbornene resin film as a phase difference compensating film in, for example, a liquid crystal image display device (LCD) and which reduces the incidence of the chain-state trouble and a trouble during the saponification of the film due to the knick defect in an after-process and during the application of various coating layers, for example, with regard to the cellulose ester film and further, reduces the incidence of a trouble in the film take-up process after the saponfication and after the application. <P>SOLUTION: In this method for forming the cellulose ester or the norbornene resin film with a dry film thickness of 41 to 150 μm as a method for manufacturing a film by casting a solution, the average film thickness in the width direction of the cellulose ester film or the norbornene resin film F to be taken up by a take-up roll 6 is set to fall within the range of ±2.5% of the dry film thickness of the film to be obtained, and to be 41.2 μm or more. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a solution casting film forming method for producing a cellulose ester suitable as a protective film of a polarizing plate in a liquid crystal image display (LCD) or a norbornene resin film suitable as a retardation compensation film. It is about the method.

[0002]

2. Description of the Related Art Generally, a liquid crystal image display device can be directly connected to an IC circuit with a low voltage and a low power consumption and can be made thin. Therefore, it is widely used as a display device for a word processor, a personal computer or the like. Has been done. As a protective film for such a polarizing plate, a cellulose ester film such as triacetyl cellulose (TAC) is suitable and often used because of its small birefringence. On the other hand, the norbornene-based resin film is being used as a retardation compensation film because it has excellent characteristics such as heat resistance, low specific gravity, low birefringence, and low photoelastic coefficient.

Since the liquid crystal image display device tends to be further thinned, a thinner film is required for the cellulose ester film used for the polarizing plate, and the conventional protective film has a thickness of 80 μm. And above,
It was relatively thick. However, since four protective films as LCD members are usually used, it has been desired to reduce the thickness to, for example, about 40 μm. On the other hand, a norbornene-based resin film is also desired to be thin.

Here, the conventional cellulose ester or norbornene resin film is manufactured as follows, for example, by a solution casting film forming method.

First, a solution of cellulose ester or norbornene-based resin (hereinafter referred to as "dope") is prepared, and the dope is an endless belt or a drive rotating drum made of a rotating stainless steel which is a support and has a mirror-finished surface. On the above, a dope film, that is, a web is cast by casting from a casting die, reaches the lower surface of the endless belt, and is peeled off by a peeling roll when the web is almost complete.
Further, a film was formed through a drying process and wound as a cellulose ester or norbornene resin film on a roll of a winder.

[0006]

However, with the thinning of the cellulose ester film (about 40 μm) which is the protective film for the polarizing plate and the thinning of the norbornene resin film which is the retardation compensation film, the film is wound up. In the process, a new winding fault, that is, a chain fault (chain defect) and a knick (knick defect) occurred. Here, the chain-like failure (chain-like defect) is bending of the film caused by bending or deformation of the film due to its own weight, and the knick (knick defect) is a local surface unevenness defect of the film.

The present inventors have examined the mechanism of occurrence of each failure and found that the mechanism of failure is as follows.

Chain-like failure: Deformation of the cellulose ester or norbornene-based resin film after winding due to its own weight, or breakage of the film itself caused by deformation of the film. The following three are possible.

A. Breakage of the film itself due to its own weight at the sparse overlapping portion of the cellulose ester or norbornene-based resin film wound on the winding core of the roll, and particularly at the center portion in the width direction of the film and the portion where the film thickness is reduced.

B. Folding of the film itself due to insufficient air entrainment in the film, particularly at the center in the width direction of the film and at the location where the film thickness is reduced.

C. Bending of the film itself caused by insufficient centering accuracy between the movable transport roll (gap roll) and the winding roll, which occurs particularly at a portion where the film thickness is reduced.

D. The film itself is broken due to the film expansion caused by the moisture absorption of the film, which occurs particularly at a portion where the film thickness is reduced.

Knick defect: A local surface irregularity defect of the film, which is a sticking of the films at a short distance between the films in the overlapping portion of the cellulose ester or norbornene resin film wound around the roll core. Or it is caused by sticking (that is, contact and adhesion).

In view of the above-mentioned mechanism of failure or defect generation, in order to eliminate the failure or defect, for example, by adjusting the winding tension condition of the cellulose ester or norbornene resin film, the film Attempts were made to improve failures and defects, but there was a problem that sufficient results could not be obtained.

The inventors of the present invention have made extensive studies in view of the above points, and as a result, tried to improve chain-like failures and knick defects of the film from the hard (equipment) side and the soft side, and completed the present invention. It was In other words, from a hardware perspective,
1) The transport roll arranged immediately before the winding roll was made into a spiral roll or an expander roll, whereby a stretching effect of the cellulose ester or norbornene-based resin film immediately before being wound was obtained. 2) By improving the accuracy of the distance between the transport roll arranged immediately before the winding roll and the winding roll and the accuracy of the core, the chain failure of the film and the knick defect were improved. In terms of software,
1) Setting the film winding tension condition, 2) Adjusting the film thickness of the winding film, 3) Improving the height of the protrusions by embossing the widthwise ends of the film, and improving chain defects and knick defects Was achieved.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a solution casting film forming method for producing a cellulose ester or norbornene resin film in which chain-like failures and knick defects do not occur. As a result, it is possible to reduce failures during the saponification of the cellulose ester film in the subsequent step and the application of various coating layers due to chain-like failures and knick defects, or winding of the film after the saponification and after the application. It is an object of the present invention to provide a method for producing a cellulose ester film, which can reduce failures in the process.

[0017]

In order to achieve the above object, the invention according to claim 1 of the present invention is a cellulose ester or norbornene resin film having a dry film thickness of 41 to 150 μm by a solution casting film forming method. The method for producing a film having a film winding process using a winding roll, wherein the winding process is performed between the outer peripheral surface of the cylindrical wound film and the outer peripheral surface of the movable transport roll immediately before the film. Is to wind the film while keeping the shortest distance constant, and a means for removing or reducing the surface potential of the film is provided before the winding roll, and the cellulose ester wound on the winding roll or The average film thickness in the width direction of the norbornene-based resin film is within ± 2.5% of the dry film thickness of the film to be obtained and 41.2μ.
The feature is that it is m or more.

The invention according to claim 2 is characterized in that, in the above-mentioned claim 1, the film thickness deviation in the width direction of the cellulose ester or norbornene-based resin film wound on the winding roll is 5% or less. I am trying.

According to a third aspect of the present invention, in the first aspect, the width 50 in the width direction of the cellulose ester or norbornene resin film wound on the winding roll is 50.
The local film thickness deviation per mm is 3 of the average film thickness of the film.
The feature is that it is less than or equal to%.

Further, in the invention according to claim 4, in the above-mentioned claim 1, the shortest distance between the outer peripheral surface of the cylindrical wound film and the outer peripheral surface of the movable conveying roll immediately before the outer peripheral surface is 5 to 5.
It is characterized in that it is held at a constant distance within a range of 1000 mm.

According to a fifth aspect of the present invention, in the above-mentioned fourth aspect, the shortest distance between the left end portion of the outer peripheral surface of the winding core of the winding roll and the left end portion of the outer peripheral surface of the movable conveying roll immediately before this. The difference (A-B) between (A) and the shortest distance (B) between the right end of the outer peripheral surface of the winding core of the winding roll and the right end of the outer peripheral surface of the movable transport roll immediately before this is (A-B). The average value of both distances is equal to or less than 8% of (A + B) / 2.

According to a sixth aspect of the present invention, in the first aspect, the movable conveying roll immediately before the winding roll is a spiral roll or an expander roll.

The invention according to claim 7 is the above-mentioned claims 1 to 6.
In any one of the above, embossing is applied to both ends in the width direction of the cellulose ester or norbornene-based resin film wound on a winding roll, and the height of the convex portion due to the embossing is in the range of 4 to 12 μm. It is characterized by

Further, the invention according to claim 8 is characterized in that, in the above-mentioned claim 7, the difference in height of the convex portions due to embossing at both ends in the width direction of the cellulose ester or norbornene resin film is 2 μm or less. I am trying.

According to a ninth aspect of the invention, in the first aspect, the means for removing or reducing the surface potential of the film is to blow an ion-containing gas, and the film is wound at the time of winding the cellulose ester or norbornene resin film. The collision wind speed of the ion-containing gas blown onto the substrate is set to 0.5 to 5.0 m / sec.

According to a tenth aspect of the present invention, in the first aspect, the initial winding tension at the time of winding the cellulose ester or norbornene resin film is 90.2 N / m or more and 300.8 N / m or less. Is characterized by.

The invention according to claim 11 is the above-mentioned claim 10.
In, after the completion of winding the cellulose ester or norbornene-based resin film, a cylindrical winding film having a predetermined outer diameter, the acceleration and deceleration area of the film transport speed at the time of replacement with the winding core of the next winding roll, It is characterized by being wound with a constant tension of 90.2 N / m or more and 300.8 N / m or less.

Further, the invention according to claim 12 is the same as in the above claim 1, when the cylindrical wound film having a predetermined outer diameter is wound, it acts on the core portion of the cellulose ester or norbornene resin film. The stress in the radial direction is 25,000 Pa or more and 180000 Pa or less,
In the outer peripheral part of the cylindrical wound film, 5500 Pa or more,
The feature is that it is 47,000 Pa or less.

According to a thirteenth aspect of the present invention, in addition to the first aspect, after the cellulose ester or norbornene resin film has been wound up, the cylindrical winding film is removed, and the initial winding tension is 90.2 N / m. As described above, the rewinding is performed at 300.8 N / m or less.

According to a fourteenth aspect of the present invention, in the above first aspect, the water content at the time of winding the cellulose ester or norbornene resin film wound on the winding roll is 1.5 to 5.0%. Is characterized by.

The invention according to claim 15 is the above-mentioned claim 1, wherein the post-drying zone is followed by a humidity control zone, and the humidity control zone is a cellulose ester or norbornene resin film at the time of winding. In order to make the water content of (1) equal to the equilibrium water content, it is characterized by having the humidity control time and the atmospheric humidity represented by the following relational expressions.

Humidity control time [seconds] = 10000 / (atmosphere humidity [RH
%])-3200 / (film thickness [μm]) The invention according to claim 16 is the same as in the above claim 1, after the completion of winding the cellulose ester or norbornene resin film, It is supposed to be wrapped with the packaging material with.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

The method for producing a cellulose ester or norbornene-based resin film according to the present invention is a solution casting film forming method in which a dry film thickness is 41 to 150 μm, preferably 41 to 150 μm.
It is intended to produce a 100 μm cellulose ester or norbornene-based resin film.

Referring to FIG. 1, an apparatus for producing a cellulose ester or norbornene resin film for carrying out the method of the present invention comprises a support (1) composed of a driving rotating stainless steel endless belt, and a support (1). A die (2) for casting a dope, which is a raw material solution of a cellulose ester or norbornene resin film, and a web (W) formed on the support (1) by the die (2). The peeling roll (11) to be peeled from the web and the web (W) peeled from the support (1) by the peeling roll (11) are dried while being conveyed via a plurality of conveyance rolls (12) and (16). Before and after the drying, the film (F) obtained by drying the web (W) is fed to at least one transport roll (21) following the drying zone (4) and the post-drying zone (4). Winding by means of winding roll (6) Rutotomoni,
A moisture conditioning zone (5) for adjusting the water content of the film (F) to an equilibrium water content is provided.

First, a cellulose ester or norbornene resin film raw material mixer (not shown) is used to prepare a solution of cellulose ester or norbornene resin (hereinafter referred to as "dope"), and the dope is cast from the casting die (2). , Cast on a support (1) consisting of a drive-rotating stainless steel endless belt with a mirror-finished surface,
A dope film, that is, a web (W) is obtained, and when the web (W) reaches the lower surface of the support (1) composed of an endless belt and has completed one round, it is peeled off by a peeling roll (11).

The pre-drying zone (3) contains the first housing (10)
It is provided with a plurality of transfer rolls (12) arranged in a zigzag pattern. The first housing (10) has a dry air blowing port (1
3) and the outlet (14) are provided.

Then, the web (W) peeled from the peeling side end of the support (1) by the peeling roll (11) is entirely conveyed in the first housing (10) of the pre-drying zone (3). roll
It is conveyed via (12), dried by the dry air blown from the dry air blowing port (13) during the conveyance, and then sent to the post-drying zone (4).

The post-drying zone (4) contains the second housing (15).
It is provided with a plurality of transfer rolls (16) arranged in a staggered arrangement. The second housing (15) has a dry air blowing port (1
7) and the outlet (18) are provided. Then, the web (W) sent from the pre-drying zone (3) passes through the inside of the housing (15) of the post-drying zone (4) for all the transport rolls (16).
It is transported via the
The film (F) is dried by the drying air blown from (17) and then sent to the humidity control zone (5).

The humidity control zone (5) includes a plurality of transport rolls (21) including one winding roll (6) provided in the housing (20) and a movable transport roll (7) immediately before this. I have it. The winding roll (6) is arranged on the downstream side of the transport rolls (21) (7) group. Then, the film (F) sent from the post-drying zone (4) is transported inside the housing (20) via all the transport rolls (21) (7) and wound on the winding roll (6). At the same time, the water content of the film (F) is adjusted appropriately. The ambient temperature in the front and rear drying zones (3) and (4) and the humidity control zone (5) is, for example, 5 to 200 ° C, preferably 20 to 150 ° C.

Next, referring to FIG. 2, in the winding step, the shortest distance between the outer peripheral surface of the cylindrical wound film (F) and the outer peripheral surface of the movable transport roll (7) immediately before this ( L)
Rolling film (F) while keeping the roll constant
It is wound on (6). In addition, before the winding roll (6), means such as an antistatic blower for removing or reducing the surface potential of the film (F) is provided.

According to the first aspect of the present invention, the average film thickness in the width direction of the cellulose ester or norbornene resin film (F) wound on the winding roll (6) is to be obtained. ± dry film thickness of film (F)
It is within 2.5% and 41.2 μm or more.

Here, the larger the average film thickness of the film (F), the higher the rigidity of the film (F), and the chain of the film (F) caused by the bending or deformation of the film (F) due to its own weight. It becomes difficult to cause a malfunction and a knick defect.

For example, specifically, the target dry film thickness is 41 μm.
In the production of the cellulose ester film (F), the average film thickness in the width direction of the film is 41 ± 1.02.
Although it is 5 μm, in the production of the film (F) having the target dry film thickness of 41 μm, when the average film thickness in the film width direction is less than 41.2 μm, sufficient rigidity of the film (F) can be obtained. Therefore, in this case, the average film thickness in the width direction of the film is 41.2 μm or more and 42.025 or more.
It is to be less than or equal to μm.

Other than the above, for example, a target dry film thickness 50
The average film thickness in the width direction of the film (F) of μm or 60 μm is within ± 2.5% of the dry film thickness of 50 μm,
The dry film thickness may be within ± 2.5% of 60 μm. Further, particularly, the average film thickness in the width direction of the film (F) having the target dry film thickness of 80 μm is preferably within ± 2.0% of the dry film thickness of 80 μm. When the dry film thickness of the cellulose ester or norbornene resin film (F) exceeds 150 μm, needless to say, it is not possible to meet the demand for thinning of the optical film used in the liquid crystal image display device.

According to the second aspect of the present invention, the film thickness deviation in the width direction of the cellulose ester or norbornene resin film (F) wound on the winding roll (6) is 5% or less. I am trying. For example, as shown in FIG. 3, XY which is a deviation between the maximum film thickness (X) and the minimum film thickness (Y) per width 50 mm in the width direction of the film (F).
Is 5% or less. Thus, if the local film thickness deviation in the width direction of the film (F) is 5% or less,
The film thickness becomes uniform and the film (F) has no distortion, so that it is possible to prevent the chain failure and the knick defect of the film (F). The film (F)
If the local film thickness deviation in the width direction exceeds 5%, the film thickness becomes uneven, and chain-like failures and knick defects of the film (F) are likely to occur, which is not preferable.

According to the third aspect of the present invention, the local film thickness per width 50 mm in the width direction of the cellulose ester or norbornene resin film (F) wound on the winding roll (6). The deviation is 3% or less of the average film thickness of the film. As a result, the film thickness can be made even more uniform, and the occurrence of chain defects and knick defects in the film (F) can be reliably prevented.

In the invention according to claim 4 of the present invention,
For example, as shown in FIG. 1, the shortest distance (L) between the outer peripheral surface of the cylindrical wound film (F) and the outer peripheral surface of the movable transport roll (7) immediately before this is in the range of 5 to 1000 mm. Holds at a certain distance. The reason for defining such a shortest distance (L) is from the viewpoint of parallelism between the winding roll (6) and the transport roll (7). That is, the winding roll
If the accuracy of the parallelism between (6) and the transport roll (7) is poor, for example, if the above-mentioned shortest distance (L) is less than 5 mm, the tension balance between the left and right of the film width when the film (F) is wound. It is not preferable, because the winding film becomes uneven and the winding film becomes uneven or loose. The shortest distance (L) is 1000m
If it exceeds m, the distance between the take-up roll (6) and the immediately preceding movable transport roll (7) is too wide, and the accuracy of the parallelism of both rolls (6) and (7) deteriorates, which is not preferable. In this way, by keeping the shortest distance (L) between the outer peripheral surface of the cylindrical wound film (F) and the outer peripheral surface of the movable transport roll (7) immediately before this at a constant distance, In the immediately preceding step, the film (F) is surely brought into contact with air (air), and a uniform air layer can be formed between the surfaces of the film (F) to be wound, whereby the film (F) It is possible to prevent the occurrence of chain-like failures and knick defects.

In the invention according to claim 5 of the present invention, the accuracy of the shortest distance between the core of the winding roll (6) of the cylindrical winding film (F) and the movable transport roll (7) immediately before it. Is prescribed. That is, as shown in FIG. 4, the left end of the outer peripheral surface of the winding core of the winding roll (6) of the cylindrical winding film (F) and the left end of the outer peripheral surface of the movable transport roll (7) immediately before this. Shortest distance between (A) and the winding roll
The difference (AB) between the right end of the outer peripheral surface of the winding core of (6) and the right end of the outer peripheral surface of the movable transport roll (7) immediately before this is the difference (AB) from both distances. Is 8% or less of the average value of (A + B) / 2. In this range, the winding roll (6)
The accuracy of the parallelism between the roll and the transport roll (7) is good, the distortion of the winding film (F) can be eliminated, and the chain-like failure and the knick defect of the film (F) can be prevented. it can.

According to the sixth aspect of the present invention, for example, as shown in FIG. 5, the movable conveying roll (7) immediately before the winding roll (6) is a spiral roll or an expander roll. . These rolls have the effect of stretching the film (F) immediately before being wound up, and can prevent chain-like failures and knick defects in the film (F).

In the invention according to claim 7 of the present invention, for example, as shown in FIG. 6, embossing is applied to both ends in the width direction of the cellulose ester or norbornene resin film (F) wound on the winding roll (6). By processing, the height of the convex portion (30) by embossing is set in the range of 4 to 12 μm. Such embossing can be performed, for example, in FIGS.
As shown in, the embossing ring (8) is pressed against one end of the film (F) in the width direction of the film (F), that is, both left and right edges of the film (F) while the film (F) is being conveyed. ) On the other side, the backup roll (9) receives it over the entire width direction of the film. The height of the convex portion (30) formed by such embossing is set by the temperature rise (heating) of the embossing ring (8) itself and the pushing amount by the embossing ring (8). Here, when the heights of the convex portions (30) at both ends in the width direction of the embossed film (F) are each less than 6 μm, as shown in FIG. 9, between the wound films (F), Since the voids (31) are too narrow, sticking (that is, contact and adhesion) between the films (F) occurs, which is not preferable. If the heights of the protrusions (30) at both ends in the width direction of the film exceed 12 μm, the film (F) may bend due to its own weight, or the film (F) may deform due to a chain-like failure. Also, knick defects are likely to occur, which is not preferable. The film (F) is embossed at the time when the film (F) in the middle of conveyance reaches the so-called final product width, and usually, the movable conveyance roll (7) immediately before the winding roll (6) is used. ) Is arranged in front of the conveyance direction.

According to the eighth aspect of the present invention,
For example, as shown in FIG. 9, the difference in height between the convex portions (30) and (30) due to embossing at both ends in the width direction of the cellulose ester or norbornene resin film (F) is 2 μm or less,
It is preferably 1 μm or less, more preferably 0.5 μm or less. The reason is that if there is a difference in the height of the protrusions (30) (30) at both widthwise ends of the film (F), the winding diameters at the left and right ends of the cylindrical wound film (F) after winding Difference occurs, it becomes as if it is a taper type roll-shaped film,
When the film (F) is wound into such a shape, the film (F) itself is distorted, which causes a chain-like failure. Therefore, the smaller the difference in height between the protrusions (30) and (30) due to the embossing at the both ends in the width direction of the film (F), the better, and it is particularly preferable that the difference is 2 μm or less.

In the invention according to claim 9 of the present invention, for example, as shown in FIG. 1, the means for removing or reducing the surface potential of the film (F) is to blow an ion-containing gas such as an antistatic blower, The collision wind speed of the ion-containing gas blown onto the film (F) at the time of winding the cellulose ester or norbornene resin film (F) is 0.5.
Limited to ~ 5.0 m / sec. The reason is that, for example, as shown in FIG. 9, a void (air layer) (31) is firmly formed between the winding films (F),
It is considered that the flexure of the film (F) due to its own weight can be reduced and the chain-like failure of the film (F) and the occurrence of knick defects can be prevented. here,
If the collision wind speed of the ion-containing gas blown onto the film (F) during winding is less than 0.5 m / sec, a sufficient air layer cannot be formed between the wound films (F), and the film It is not preferable because the surface potential of (F) cannot be sufficiently removed or reduced. Further, when the collision wind speed of the ion-containing gas exceeds 5.0 m / sec, the wind speed is too strong, and the ion wind pushes the film (F) to cause fluttering, which disturbs the winding of the film (F). Therefore, it is not preferable.

In the tenth aspect of the present invention, the cellulose ester or norbornene resin film (F) is used.
The initial winding tension when winding is 90.2 N / m or more, 3
It is limited to 00.8 N / m or less. The reason is that when the initial winding tension at the time of winding the film is less than 90.2 N / m, a phenomenon of horse-back-like film folding occurs in the winding film (F), and the initial winding tension is 30%.
When it exceeds 0.8 N / m, it is too strong and sticking failure between the films (F) due to tightness of winding occurs, which is not preferable.

According to the eleventh aspect of the present invention, the cellulose ester or norbornene resin film (F) is used.
After the completion of the winding, the cylindrical transport film (so-called full roll film) (F) having a predetermined outer diameter and the film transport speed at the time of exchanging the core of the next roll (6) are added. The deceleration region is wound with a constant tension of 90.2 N / m or more and 300.8 N / m or less. Here, if the acceleration / deceleration region of the film transport speed at the time of replacement of the full roll film (F) is less than 90.2 N / m, so-called winding disorder occurs, which is not preferable. Further, if the acceleration / deceleration region of the film transport speed exceeds 300.8 N / m, a sticking failure between the films (F) due to tightness of winding occurs, which is not preferable.

Further, in the twelfth aspect of the present invention, when the cylindrical wound film having a predetermined outer diameter is wound, a radial direction acting on the core portion of the cellulose ester or norbornene resin film is taken. Stress is 2
5000 Pa or more and 180000 Pa or less, 5500 Pa or more and 47000 Pa at the outer peripheral portion of the cylindrical wound film
It is set to Pa or less. Here, the radial stress acting on the roll film is a stress acting 2 mm radially inward from the outermost peripheral surface during winding (transition period). When the acting radial stress is less than 25000 Pa in the core portion or less than 5500 Pa in the outer peripheral portion of the cylindrical wound film (F), the phenomenon of horse-back-shaped film folding in the winding film (F) may occur. Radial stress that occurs and acts on the full roll film (F)
If it exceeds 180,000 Pa in the core portion or exceeds 47,000 Pa in the outer peripheral portion of the cylindrical wound film (F), sticking failure (that is, contact and adhesion) between the films (F) due to tightness of winding may occur, which is not preferable. .

In the thirteenth aspect of the present invention, further, after the completion of winding the cellulose ester or norbornene resin film (F), the cylindrical wound film (F).
Is removed, and it is rewound at an initial winding tension of 90.2 N / m or more and 300.8 N / m or less. By such rewinding, it is possible to prevent occurrence of chain-like failure of the film (F). Here, when the initial winding tension at the time of rewinding is less than 90.2 N / m, a phenomenon of a horse-back-shaped film breaking occurs in the winding film (F), and the initial winding tension is 300.8 N / m. If it exceeds m, a sticking failure between the films (F) due to tightness of winding may occur, which is not preferable.

In the fourteenth aspect of the present invention, the cellulose ester or norbornene resin film (F) wound on the winding roll has a water content of 1.
It is set to 5 to 5.0%.

According to the fifteenth aspect of the present invention, as shown in FIG. 1, the post-drying zone (4) is followed by the humidity control zone (5), and the humidity control zone (5) is provided. In order to make the water content of the cellulose ester or norbornene-based resin film (F) at the time of winding into an equilibrium water content, it has a humidity control time and an atmospheric humidity represented by the following relational expressions. .

Humidity control time [seconds] = 10000 / (atmosphere humidity [RH
%])-3200 / (film thickness [μm]) The atmospheric temperature in the drying zone (3) (4) and the humidity adjusting zone (5) is 5 to 200 ° C, preferably 20 to 150 ° C.

Here, for example, when the dry film thickness of the cellulose ester film (F) is 41 μm and the atmospheric humidity in the humidity control zone (5) is 55 RH%, the humidity control time is 1
It will be 04 seconds.

Further, according to the inventions of claims 14 and 15, it is possible to prevent film expansion due to moisture absorption during transport of the film (F), and prevent occurrence of chain failure of the film (F). can do.

In the sixteenth aspect of the present invention, further, after the cellulose ester or norbornene-based resin film (F) has been wound, the cylindrical wound film (full roll film) (F) is protected against moisture. It is to be wrapped with the given packaging material. As a result, film expansion due to moisture absorption of the fully wound roll film (F) after the completion of winding can be prevented, and occurrence of chain-like failure of the film (F) can be prevented.

In the above, the transport speed of the web (W) or the film (F) is, for example, 2 to 200 m / min. In addition, peeling roll (11), each transport roll (12) (16) (21)
The outer diameters of (7) and the winding roller (6) are, for example, 60 to 40.
It is 0 mm, preferably 70 to 350 mm.

According to the above-mentioned method for producing a cellulose ester or norbornene resin film of the present invention, it is possible to produce a cellulose ester or norbornene resin film (F) which does not cause chain defects and knick defects.

In the subsequent step of the cellulose ester film (F) produced in this way, for example, in order to make it an optical film having various functions, for example, an antistatic layer for providing an antistatic function and a surface hardness The coating step of providing a hard coat layer for improving the coating property, an undercoat layer for improving the film-forming property, or an anti-curl layer for preventing curling is carried out. Alternatively, a saponification step of subjecting the cellulose ester film (F) to an alkali saponification treatment is carried out before the coating of each coating layer.
The alkali saponification treatment may be carried out before or after the coating of each coating layer. For example, after the cellulose ester film (F) is subjected to alkali saponification treatment, an antistatic layer and / or an ultraviolet curable resin layer, or an antireflection layer may be further coated, or a back coat layer, an antistatic layer, an ultraviolet curable resin. After applying the layer, it is also possible to apply an alkali saponification treatment and further apply an antireflection layer.

In any case, according to the method for producing a cellulose ester or norbornene resin film of the present invention, it is possible to provide a cellulose ester or norbornene resin film (F) which does not cause chain defects and knick defects. Therefore, failures at the time of saponification of the cellulose ester film (F) and application of various coating layers in a later step due to chain-like failures of the film (F) and knick defects can be significantly reduced, or It is possible to reduce failures in the winding step of the film (F) after saponification and coating.

In the method for producing a cellulose ester film of the present invention, examples of the cellulose ester as the main raw material of the cellulose ester film include cellulose triacetate, cellulose diacetate, cellulose acetate butyrate, cellulose acetate propionate and the like. . In the case of cellulose triacetate, the degree of polymerization is 250 to 400 and the amount of bound acetic acid is 54.
~ 62.5% cellulose triacetate is preferred,
Cellulose triacetate having an amount of bound acetic acid of 58 to 62.5% is more preferable because it has a strong base strength. As the cellulose triacetate, either cellulose triacetate synthesized from cotton linter or cellulose triacetate synthesized from wood pulp can be used alone or in combination.

In the case of the solution casting film forming method, a support (1) made of a driving rotating stainless steel endless belt (or a driving rotating stainless steel drum), cellulose triacetate synthesized from a cotton linter having good releasability from the top. It is preferable to use a large amount because of high productivity and efficiency.

When a cellulose ester film is produced, the ratio of cellulose triacetate synthesized from cotton linter is 60% by weight or more, and the effect of releasability becomes remarkable. Therefore, 60% by weight or more is preferable, and 85% by weight is more preferable. % Or more, and most preferably used alone.

Improving the performance of the liquid crystal image display device due to the cellulose ester film by incorporating a plasticizer, an ultraviolet absorber, an antioxidant, a processing stabilizer, a matting agent and the like into the cellulose ester film. You can

The plasticizer which can be used in the present invention is not particularly limited, but in the phosphoric acid ester system, triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, diphenyl biphenyl phosphate, trioctyl phosphate can be used. Phthalates such as tributyl phosphate, diethyl phthalate, dimethoxyethyl phthalate, dimethyl phthalate, dioctyl phthalate, dibutyl phthalate, di-2-ethylhexyl phthalate, etc., glycolates such as triacetin, tributyrin, butylphthalyl butyl glycol. Rate, ethyl phthalyl ethyl glycolate, methyl phthalyl ethyl glycolate, butyl phthalyl butyl glycolate etc. Preferably used in combination is.

If necessary, two or more kinds of plasticizers may be used in combination. In this case, if the ratio of the phosphoric acid ester plasticizer used is 50% or less, hydrolysis of the cellulose ester film is caused. It is preferable because it is difficult and has excellent durability.

It is more preferable that the ratio of the phosphoric acid ester-based plasticizer is small, and it is particularly preferable to use only the phthalic acid ester-based or glycolic acid ester-based plasticizer.

In the present invention, further, in order to keep the water absorption rate and the water content within a specific range, the preferable addition amount of the plasticizer is the weight% based on the cellulose ester.
And 3 to 30% by weight, and more preferably 10 to 25
%, More preferably 15 to 25% by weight. Three
If it exceeds 0% by weight, mechanical strength and dimensional stability deteriorate.

An ultraviolet absorber is used in the cellulose ester film of the present invention. The ultraviolet absorber has an excellent ability to absorb ultraviolet rays having a wavelength of 370 nm or less from the viewpoint of preventing deterioration of liquid crystal, and has a wavelength of 400 from the viewpoint of good liquid crystal display.
Those that absorb visible light of nm or more as little as possible are preferably used.

In the present invention, in particular, the wavelength is 370 nm.
It is necessary that the transmittance is 10% or less, preferably 5% or less, and more preferably 2% or less.

In the present invention, it is preferable to use one or more of these ultraviolet absorbers, and two or more different ultraviolet absorbers may be contained.

In the present invention, it is particularly preferable to add a benzotriazole type ultraviolet absorber having less unnecessary coloring to the cellulose ester film.

The ultraviolet absorber may be added to the dope after dissolving the ultraviolet absorber in an organic solvent such as alcohol, methylene chloride or dioxolane, or may be added directly to the dope composition. For inorganic powders that do not dissolve in an organic solvent, a dissolver or a sand mill is used in an organic solvent and a cellulose ester to disperse them and then added to the dope.

The amount of the ultraviolet absorber used in the present invention is 0.1 to 2.5% by weight, preferably 0.5 to 2.0% by weight, more preferably 0.8 to 2% by weight based on the cellulose ester. It is 0.0% by weight. If the amount of the ultraviolet absorber used exceeds 2.5% by weight, the transparency tends to deteriorate, which is not preferable.

Examples of the solvent for the cellulose ester in the present invention include lower alcohols such as methanol, ethanol, n-propyl alcohol, iso-propyl alcohol, n-butanol, etc., lower aliphatic carbonization such as cyclohexanedioxane and methylene chloride. Hydrogen chlorides and the like can be used.

The solvent ratio is, for example, 70 to 95% by weight of methylene chloride, and 30 to 5% by weight for other solvents.
Is preferred. The concentration of cellulose ester is 10 to 5
0% by weight is preferred. The heating temperature after the addition of the solvent is preferably not lower than the boiling point of the solvent used and in the range in which the solvent does not boil, and is preferably set to 60 ° C. or higher and 80 to 110 ° C., for example. The pressure is set so that the solvent does not boil at the set temperature.

After melting, the solution is taken out from the container while being cooled, or is taken out from the container by a pump or the like and cooled by a heat exchanger or the like, and is used for film formation.

In the method for producing a cellulose ester film of the present invention, fine particles are added as a matting agent, which is preferable. The type of fine particles is preferably an inorganic compound, and examples of the inorganic compound include fine particles of silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, tin oxide and the like. Among these, a compound containing a silicon atom is preferable, and silicon dioxide fine particles that can reduce the haze (haze or haze) of the film are particularly preferable.

On the other hand, in the method for producing a norbornene-based resin film of the present invention, the norbornene-based resin, which is the main raw material of the norbornene-based resin film, is a known resin, for example, JP-A-3-14882 and JP-A-3-14882. Three
-122137 gazette etc. are described.

Examples of the monomer constituting the thermoplastic saturated norbornene resin film include norbornene and
5-methyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl-2-norbornene, 5-ethylidene-2-norbornene, 5-methoxycarbonyl-2
-Norbornene, 5,5-dimethyl-2-norbornene, 5-cyano-2-norbornene, 5-methyl-5-
Methoxycarbonyl-2-norbornene, 5-phenyl-2-norbornene, 5-phenyl-5-methyl-2-
Examples include norbornene.

The thermoplastic saturated norbornene-based resin is obtained by, for example, modifying a ring-opening polymer or a ring-opening copolymer of a norbornene-based monomer (A) with maleic acid or cyclopentadiene, if necessary. , Hydrogenated resin, (B) norbornene-based monomer addition-polymerized resin, (C) norbornene-based monomer addition-polymerized with olefin-based monomer such as ethylene or α-olefin, (D) norbornene-based monomer Examples thereof include resins obtained by addition polymerization with a cyclic olefin-based monomer such as cyclopentene, cyclooctene, and 5,6-dihydrodicyclopentadiene, and modified products of these resins. These polymerizations can be carried out by a conventional method. .

The production of the norbornene resin film by the method of the present invention can be carried out by any known method using the thermoplastic saturated norbornene resin. For example, a solution casting film forming method, a melt molding method and the like can be mentioned, and a solution casting film forming method is particularly preferable.

In order to produce a norbornene resin film by the solution casting film forming method of the present invention, first, for example, toluene, xylene, ethylbenzene, chlorobenzene,
High boiling solvents such as triethylbenzene, diethylbenzene, isopropylbenzene or these high boiling solvents and cyclohexane, benzene, tetrahydrofuran, hexane,
The thermoplastic saturated norbornene-based resin is preferably dissolved in a mixed solvent of low boiling point solvents such as octane in an amount of 5 to 60% by weight to obtain a resin solution (dope).

In the film drying step, the film peeled from the support (1) is further dried so that the residual solvent amount is 3% by weight or less, preferably 1% by weight or less, more preferably 0.5% by weight or less. Is preferable for obtaining a film having good dimensional stability. In the film drying step, generally, a roll suspension method, a pin tenter method, or a clip tenter method is adopted, in which the film is dried while being conveyed.

The means for drying the film is not particularly limited, and generally hot air, infrared rays, heating rolls, microwaves or the like is used. It is preferable to use hot air for the sake of simplicity. The drying temperature is preferably in the range of 40 to 150 ° C, divided into 3 to 5 stages of temperature, and gradually increased.
In order to improve the dimensional stability, it is more preferable to carry out the above range.

The steps from casting to post-drying are as follows.
It may be in an air atmosphere or an inert gas atmosphere such as nitrogen gas.

The winding machine relating to the production of the cellulose ester or norbornene resin film of the present invention may be a commonly used one, such as a constant tension method, a constant torque method, a taper tension method, a program tension with a constant internal stress. It can be wound by a winding method such as a control method.

The thickness of the cellulose ester or norbornene resin film produced by the method of the present invention is
It is used in a thickness of 41 to 150 μm, but it is preferably 41 to 100 μm in order to reduce the thickness and weight of the liquid crystal image display device. When the thickness of the cellulose ester or fullbornene-based resin film is less than 41 μm, the stiffness of the film is lowered, so that troubles such as wrinkles are likely to occur in the polarizing plate making process. Alternatively, when the thickness of the norbornene-based resin film is thicker than 150 μm, the contribution to the thinning of the liquid crystal image display device is small.

In the above embodiment, the film (F) winding step is performed in the humidity control zone (5), but in some cases, the film (F) winding step is performed. May be performed after the humidity control zone (5).

[0097]

EXAMPLES Next, examples of the present invention will be described together with comparative examples.

Examples 1 to 6 and Comparative Example In producing a cellulose ester film having a target dry film thickness of 41 μm by the method of the present invention, a dope was first prepared. That is, the following composition containing triacetyl cellulose dissolved in a solvent was placed in a closed container, dissolved with stirring to prepare a dope, and the prepared dope was filtered with a filter paper.

(Dope Composition) Cellulose triacetate having an acetyl substitution degree of 2.88 (number average molecular weight 150000) 100 parts by weight triphenyl phosphate 10 parts by weight ethylphthalylethyl glycolate 2 parts by weight Tinuvin 326 1 part by weight AEROSIL 200V 0.1 Parts by weight methylene chloride 475 parts by weight ethanol 25 parts by weight Next, a cellulose ester film was produced as follows using the production apparatus shown in FIG.

A cellulose ester solution (hereinafter referred to as "dope") was prepared in a raw material mixer (not shown),
The dope is cast from a casting die (2) onto a support (1) consisting of a driven rotating stainless steel endless belt having a mirror-finished surface to form a dope film or web (W).
And a web (W) comprising an endless belt
When reaching the lower surface of (1) and making one round, the peeling roll
It was peeled off by (11).

Next, the web (W) peeled off by the peeling roll (11) has a pre-drying zone (3) and a post-drying zone (4).
It is dried by a dry air while passing through the film to form a film (F), and then sent to the humidity control zone (5). In addition,
The ambient temperature in the pre-drying zone (3) was 70 ° C., and the ambient temperature in the post-drying zone (4) was 120 ° C.

The humidity control zone (5) comprises a plurality of transport rolls (21) and one winding roll provided in the housing (20).
(6), and the winding roll (6) was arranged on the downstream side of the transport roll (21) group. Then, the film (F) sent from the post-drying zone (4) is transported in the housing (20) via all the transport rolls (21), and then the take-up roll.
The water content of the film (F) is adjusted appropriately while being wound up on (6). Here, the target dry film thickness of the cellulose ester film (F) is 41 μm, and the humidity control zone is
The ambient temperature of (5) is 25 ℃, and the ambient humidity is 55RH.
%. The humidity conditioning time was 104 seconds.

Then, the cellulose ester film (F) was produced for Examples 1 to 6 and Comparative Example according to the present invention under different production conditions, and the performance of the cellulose ester film (F) obtained under each production condition was evaluated. The evaluation and the obtained results are collectively shown in Tables 1a to 1c.

As shown in FIG. 2, in the winding step, the shortest distance (L) between the outer peripheral surface of the cylindrical wound film (F) and the outer peripheral surface of the movable transport roll (7) immediately before it.
Rolling film (F) while keeping the roll constant
The average film thickness in the width direction of the cellulose ester film (F) wound on the (6) and wound on the winding roll (6) is ± the dry film thickness of the film (F) to be obtained.
Within 2.5% and 41.2 μm or more. Further, the film thickness deviation in the width direction of the cellulose ester film (F) to be wound is set to 5% or less, and further, the local film thickness deviation per width 50 mm of the film (F) in the width direction is It was 3% or less of the average film thickness. The shortest distance accuracy between the winding core of the winding roll (6) of the cylindrical wound film (F) and the movable transport roll (7) immediately before this was measured.

Further, in each example, a spiral roll (see FIG. 5) was used as the movable transport roll (7) immediately before the winding roll (6). The cellulose ester film (F) wound on the take-up roll (6) is embossed on both ends in the width direction, and the protrusions (30) are formed by the embossing.
The height of the protrusions is set to 4 to 12 μm, and the difference in height between the protrusions (30) and (30) formed by embossing is set to 2 μm or less.

[0106] A neutralization blower was used as a means for removing or reducing the surface potential of the cellulose ester film (F) during winding, and the collision wind speed of the ion-containing gas was measured.

The cellulose ester film (F)
The initial winding tension when winding is 90.2 N / m or more, 3
It was set to 00.8 N / m or less. After winding the cellulose ester film (F), a cylindrical wound film having a predetermined outer diameter (so-called full roll film) (F)
Then, the film was wound with a constant tension in the acceleration / deceleration region of the film transport speed at the time of replacement with the core of the next winding roll (6).

In order to adjust the water content of the cellulose ester film (F) at the time of winding to an equilibrium water content, the post-drying zone (4) is followed by a humidity-controlling zone (5). In 5), the water content of the cellulose ester film (F) wound on the winding roll (6) at the time of winding was measured.

In addition, in Tables 1a to 1c, the measurement and evaluation were performed as follows.

* Minimum distance between the wound film and the immediately preceding transport roll: The shortest distance between the outer peripheral surface of the cylindrical wound film and the outer peripheral surface of the movable transport roll immediately before this * The distance between the wound film and the immediately previous transport roll Accuracy: Minimum distance accuracy between the outer peripheral surface of the core and the outer peripheral surface of the movable transport roll immediately before this * Ion-containing gas blowing wind speed: Ion-containing gas blowing wind speed by the static elimination blower * Chain-like failure Evaluation of occurrence: Dry film thickness 41 μm
0 when the film is wound at a transport speed of 30 m / min
~ 1500m Visually evaluate the number of chain-shaped m during winding * Evaluate the presence of knick defects: Visually evaluate the outer circumference of the winding after winding * Evaluate the occurrence of chain-shaped failure due to aging: Moisture-proof Presence or absence of chain-like failure after one month has passed after packaging with the packaging material with the addition. In addition, the criteria for comprehensive evaluation of the cellulose ester film in Table 1c are presence / absence of chain failure, presence / absence of knick defects, and Wrap with a moisture-proof packaging material 1
The results of the chain-shaped failures after a lapse of months were comprehensively evaluated, and the following four stages were set. ◎: excellent, ○: good,
△: Yes, ×: No

[0111]

[Table 1] As is clear from the results of Tables 1a to 1c above, according to Examples 1 to 6 of the present invention, it was possible to manufacture a cellulose ester film free from chain-like failures and knick defects. On the other hand, in the comparative example, many chain-like failures and knick defects occurred in the cellulose ester film.

According to the cellulose ester film which does not cause the chain-like failure and the knick defect by the method of the present invention, the saponification of the cellulose ester film in the subsequent step due to the chain-like failure and the knick, Further, it was possible to significantly reduce failures during coating of various coating layers, and further it was possible to reduce failures during the film winding step after saponification and after coating.

[0113]

As described above, the present invention is a method for producing a cellulose ester or norbornene-based resin film having a dry film thickness of 41 to 150 μm by the solution casting film forming method, in which the film is wound by a winding roll. And a winding step, in which the film is wound while keeping the shortest distance between the outer peripheral surface of the cylindrical wound film and the outer peripheral surface of the movable transport roll immediately before this constant. Yes, and a means for removing or reducing the surface potential of the film is provided before the winding roll, and obtains the average film thickness in the width direction of the cellulose ester or norbornene-based resin film wound on the winding roll. Within ± 2.5% of the dry film thickness of the film and 41.2μ
According to the method of the present invention, it is possible to produce a cellulose ester or norbornene-based resin film free from chain-like failures and knick defects, and further, chain-like failures of the film. And failure at the time of saponification of the cellulose ester film in the subsequent step and application of various coating layers due to knick defects can be significantly reduced, or failure at the winding step of the film after saponification and after application The effect of being able to achieve the reduction of

[Brief description of drawings]

FIG. 1 is a flow sheet of an apparatus for carrying out the method for producing a cellulose ester or norbornene resin film of the present invention.

FIG. 2 is a schematic side view showing a winding process of a cellulose ester or norbornene resin film.

FIG. 3 is an enlarged cross-sectional view of a main part of a cellulose ester or norbornene-based resin film, showing a maximum film thickness and a minimum film thickness.

FIG. 4 is an enlarged schematic front view of a main part of a winding core of a winding roll and a movable conveying roll immediately before the winding core.

FIG. 5 is an enlarged schematic plan view of a main part of a movable conveying roll including a spiral roll immediately before a winding roll.

FIG. 6 is an enlarged plan view of an essential part of a cellulose ester or norbornene-based resin film having both ends in the width direction embossed.

FIG. 7 is an enlarged side view of essential parts showing an apparatus part for performing embossing on both ends in the width direction of the cellulose ester or norbornene resin film.

FIG. 8 is an enlarged side view of an essential part showing a device part for performing the embossing process.

FIG. 9 is a partially enlarged cross-sectional view of a cellulose ester or norbornene-based resin film in a laminated state after winding, which has protrusions formed by embossing on both ends in the width direction.

[Explanation of symbols]

1 Endless belt (support) 2 casting die 3 pre-drying zone 4 Post-drying zone 5 humidity control zone 6 winding roll 7 Transport roller just before 8 embossed ring 11 peeling roll 30 Embossed convex parts W web F film

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F205 AA01 AA12 AG01 AG23 AH73                       AM25 AM32 AR01 AR04 AR12                       GA07 GB02 GC07 GN08 GN21                       GN24

Claims (16)

[Claims] 1. A dry film thickness 41 by a solution casting film forming method.
A method for producing a cellulose ester or norbornene-based resin film having a thickness of up to 150 μm, the method including a film winding step using a winding roll, the winding step comprising:
The film is wound while keeping the shortest distance between the outer peripheral surface of the cylindrical wound film and the outer peripheral surface of the movable transport roll immediately before this, and the surface potential of the film in front of the winding roll. Is provided with a means for removing or reducing the average film thickness in the width direction of the cellulose ester or fullbornene-based resin film wound on a winding roll, ± of the dry film thickness of the film to be obtained.
A method for producing a cellulose ester or norbornene-based resin film, which is 2.5% or less and 41.2 μm or more. 2. The film thickness deviation in the width direction of the cellulose ester or norbornene-based resin film wound on a winding roll is set to 5% or less.
A method for producing the described cellulose ester or norbornene-based resin film. 3. A cellulose ester or norbornene-based resin film wound on a take-up roll has a local film thickness deviation per width of 50 mm in the width direction of 3% or less of the average film thickness of the film. The method for producing a cellulose ester or norbornene resin film according to claim 1. 4. The shortest distance between the outer peripheral surface of the cylindrical wound film and the outer peripheral surface of the movable conveying roll immediately before the outer peripheral surface is 5
The method for producing a cellulose ester or norbornene-based resin film according to claim 1, wherein the cellulose ester or norbornene-based resin film is held at a constant distance within a range of up to 1000 mm. 5. The shortest distance (A) between the left end of the outer peripheral surface of the winding core of the winding roll and the left end of the outer peripheral surface of the movable transport roll immediately before this, and the winding core of the winding roll. The difference (A-B) between the right end of the outer peripheral surface and the shortest distance (B) between the right end of the outer peripheral surface of the movable transport roll immediately before this is (A-B), and the average value of both distances is (A + B) / 2. Is less than or equal to 8%. 5. The method for producing a cellulose ester or norbornene-based resin film according to claim 4, wherein 6. The method for producing a cellulose ester or norbornene-based resin film according to claim 1, wherein the movable conveying roll immediately before the winding roll is a spiral roll or an expander roll. 7. A cellulose ester or norbornene-based resin film wound on a take-up roll is embossed at both ends in the width direction, and the height of the convex portion formed by the embossing is set in the range of 4 to 12 μm. Characteristic,
A method for producing a cellulose ester or norbornene-based resin film according to any one of claims 1 to 6. 8. The cellulose ester or norbornene-based resin according to claim 7, wherein the difference in height of the convex portions due to embossing at both ends in the width direction of the cellulose ester or norbornene-based resin film is 2 μm or less. Film manufacturing method. 9. The means for removing or reducing the surface potential of the film is to blow an ion-containing gas, and the collision wind speed of the ion-containing gas blown to the film at the time of winding the cellulose ester or norbornene resin film is 0.5. To 5.0 m / sec. 2. The method for producing a cellulose ester or norbornene resin film according to claim 1, wherein 10. The initial winding tension when winding a cellulose ester or norbornene-based resin film is 90.2.
N / m or more and 300.8 N / m or less, The manufacturing method of the cellulose ester or the norbornene-type resin film of Claim 1 characterized by the above-mentioned. 11. Acceleration / deceleration of a film transport speed at the time of exchanging a cylindrical winding film having a predetermined outer diameter with a winding core of the next winding roll after the winding of the cellulose ester or norbornene resin film is completed. The range is 90.2N /
The method for producing a cellulose ester or norbornene-based resin film according to claim 10, which comprises winding at a constant tension of m or more and 300.8 N / m or less. 12. Further, when winding a cylindrical wound film having a predetermined outer diameter, the radial stress acting on the winding core portion of the cellulose ester or norbornene-based resin film is 25,000 Pa or more and 180000 Pa or less. The method for producing a cellulose ester or norbornene-based resin film according to claim 1, wherein the peripheral portion of the wound film has a pressure of 5500 Pa or more and 47000 Pa or less. 13. Further, after the cellulose ester or norbornene-based resin film has been wound up, the cylindrical winding film is removed, and the initial winding tension is 90.2 N.
/ M or more and 300.8 N / m or less, it rewinds, The manufacturing method of the cellulose ester or the norbornene-type resin film of Claim 1 characterized by the above-mentioned. 14. A cellulose ester or norbornene-based resin film wound on a winding roll has a water content of 1.5 to 5.0% at the time of winding.
The method for producing the cellulose ester or norbornene resin film according to claim 1. 15. A post-drying zone is followed by a humidity-controlling zone, wherein the humidity-controlling zone is set to the following in order to make the water content of the cellulose ester or norbornene-based resin film at the time of winding the equilibrium water content. The method for producing a cellulose ester or norbornene-based resin film according to claim 1, which has a humidity control time and an atmospheric humidity represented by a relational expression. Humidification time [sec] = 10
000 / (atmosphere humidity [RH%])-3200 / (film thickness [μm]) 16. The cellulose ester or norbornene-based resin composition according to claim 1, wherein the cylindrical wound film is wrapped with a moisture-proof packaging material after the cellulose ester or norbornene-based resin film is wound up. Method for producing resin film.