KR20140038877A - Solution film forming facility and method - Google Patents

Abstract

The present invention prevents martensite transformation of a band of austenite-based stainless steel used in solution film formation, and supports the band (23) hung on a drum by multiple guide rollers (24) from the rear thereof. A damper (32) is formed between a shaft support (30) of the guide roller (24) and a supporting frame (31). The damper (32) is composed of a rubber elastic body. When the band (23) touches each guide roller (24), normal force applied to the band (23) is reduced by the damper (32). Thereby, martensite transformation of the band (23) of austenite-based stainless steel is prevented. Therefore, unevenness in film sizes caused by martensite transformation can be removed. [Reference numerals] (23) Band; (24) Guide roller; (32) Damper

Description

SOLUTION FILM FORMING FACILITY AND METHOD}

The present invention relates to a solution film forming facility and a method for forming a polymer film.

The polymer film (hereinafter referred to as a film) has various features such as excellent light transmittance, flexibility, and light weight thinning, and has been used in various fields as an optical functional film. Especially, since the cellulose ester type film using a cellulose acylate etc. has high toughness, low optical anisotropy, and low retardation, and is inexpensive, it is also inexpensive, The protective film of the polarizing plate which is a structural member of a liquid crystal display device (LCD), optical It is widely used for compensation films, antireflection films, viewing angle expanding films, and the like.

These optical functional films are manufactured by the solution film forming method, for example. The solution film-forming method prepares a film by dissolving a polymer mainly in an organic solvent, preparing a dope, casting a dope on the band which hangs on several drums, and runs continuously, peels and dries the dope, and dries. . In the solution film forming method, austenite stainless steel, which is rich in workability and excellent in corrosion resistance and wear resistance, is used as the material for forming the band.

The said band is supported from the inside by the guide roller, and curvature, a vibration, etc. of an up-down direction are suppressed. Thus, the vertical drag from the guide roller is applied to the band when it contacts each guide roller. However, when austenite stainless steel is used for the band, there is a problem that a portion of the band is martensite due to this vertical drag.

Martensification of the band resulting from contact with the guide roller occurs almost parallel to the running direction of the band. In addition, when austenitic stainless steel is martensitic, the volume expands. Therefore, martensite of the band becomes a deformation | transformation of stripe shape substantially parallel to a travel direction, and appears on the surface of a band. Such deformation of the surface of the band is transferred to the film and causes a thickness nonuniformity of the film.

Then, in patent document 1, the vertical drag from a guide roller is made small by rubber lining the surface of the guide roller which supports the band which hanged between each drum. Thereby, martensite of a band can be prevented and the thickness nonuniformity of a film can be eliminated. Moreover, in patent document 2, the vibration of the band at the time of high speed film forming is suppressed by making the space | interval of mutual guide rollers into a fixed range in relationship with the circumferential length of a guide roller. In patent document 3, the vibration of the band at the time of high speed film forming is suppressed by rotating a guide roller.

Japanese Unexamined Patent Publication No. 2008-221761 Japanese Unexamined Patent Publication No. 2002-307460 Japanese Laid-Open Patent Publication 2003-25352

However, in the case of using the rubber-lined guide roller of Patent Literature 1, depending on the softening conditions, there is a problem that the lined rubber tends to deteriorate due to a solvent atmosphere or a high temperature environment by backside heating, and the life is shortened. have. Moreover, when deterioration starts, the powder which generate | occur | produced from rubber accumulates between a band and a drum, and causes friction between a drum and a band, and becomes difficult to control the position of a band. In patent documents 2 and 3, since a guide roller is a metal roller and is in contact with a band, martensite cannot be prevented. Therefore, thickness nonuniformity resulting from martensitization arises in a film.

This invention is made | formed in view of the said subject, and when an austenitic stainless steel is used for the band which supports a cast film, it aims at preventing martensite formation of a band.

In order to achieve the said subject, the solution film-forming installation of this invention is running over the dope containing the austenitic stainless steel band which walks over several drum, and runs by rotation of each drum, a polymer, and a solvent. A die for discharging the band to form a flexible film, a peeling roller for peeling the flexible film on the band to form a film, a guide roller disposed in parallel with each drum and supporting the band from the inside in contact with the inner surface of the band, and a guide roller. And a damper for supporting the guide roller so as to be able to rotate freely, and a circumferential surface of the guide roller inclined within the widthwise vertical plane of the band with respect to the band.

In addition, the "arranged in parallel" here includes the case where a guide roller is arrange | positioned substantially parallel with respect to each drum.

Moreover, it is preferable that the circumferential surface is a metal of a guide roller. The damper is preferably formed to support the bearing. The movable plate further includes a movable plate for supporting bearings on both sides of the guide roller, and a rocking support part formed at the center in the width direction of the band so as to freely swing the movable plate within the width direction vertical plane of the band. The damper may be formed at a position to suppress the fluctuation of the. Moreover, you may provide a damper so that the circumferential surface of a guide roller may be supported between the guide shaft and the rotating shaft. The damper may be composed of an elastomer made of an elastomer, a flexible cylinder damper may be used, or an active damper having a load cell and hydraulically controlled based on the pressure signal of the load cell may be used.

A plurality of guide rollers are formed side by side between the drums, and dampers are preferably disposed on both sides of the guide rollers.

In the solution film forming method of the present invention, the austenitic stainless steel band is rotated over a plurality of drums, and a dope containing a polymer and a solvent is discharged from the die on the surface of the band to form a flexible film, thereby forming the flexible film. A solution film forming method which peels from a film to form a film, wherein the band is supported by a plurality of guide rollers, and the guide roller is supported by a damper so that the circumferential surface of the guide roller is inclined in the widthwise vertical plane with respect to the band. do.

According to the present invention, the guide roller which is in contact with the inner surface of the band and supports the band from the inside can be freely rotated by the bearing, and the circumferential surface of the guide roller is damped so as to be inclined in the widthwise vertical plane with respect to the band. By being supported by, the excessive vertical drag is not applied to the band by the damping action of the damper. Thus, when austenitic stainless steel is used for the band, martensite of the band is prevented. In addition, by preventing martensite of the band, a film with no thickness unevenness can be produced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the outline | summary of the solution film forming installation of this invention.
2 is a perspective view showing an outline of the flexible apparatus.
3 is a perspective view showing a guide roller and a band supported by a bearing having a damper.
It is a side view which shows the guide roller, bearing, and active damper in other embodiment.
Fig. 5 is a front view of another embodiment in which the guide roller is swinged in the widthwise vertical plane at the center in the widthwise direction of the band.
FIG. 6 is a front view including a partial cross section showing a guide roller of another embodiment having a rubber damper between an inner circumferential surface of a metal cylinder and a rotating shaft. FIG.
It is a front view which shows the outline | summary of the surface unevenness | corrugation measuring apparatus.
It is a front view which shows the outline of the apparatus for accelerated durability test of wrinkle expression.
It is a front view which shows the outline | summary of the accelerated durability test apparatus of roller surface deterioration.

(Solution film production facility)

As shown in FIG. 1, the solution film forming equipment 10 includes the casting apparatus 11, the first tenter 12, the roll drying apparatus 13, the second tenter 14, and the slitter 15. ) And a winding device 16, which are connected in series from the upstream side in order.

As shown in FIG. 2, the flexible device 11 includes the drums 21 and 22, an endless band 23 hanging on the drums 21 and 22, a guide roller 24, and a die 25. ), A duct (membrane dryer) 26, a pressure reduction chamber 27 (see FIG. 1), and a peeling roller 28. The band 23 functions as a flexible support made of metal formed in a ring shape, and hangs over the circumferential surfaces of the first drum 21 and the second drum 22. The first drum 21 is rotationally driven by a motor (not shown), whereby the band 23 travels in the first direction indicated by the arrow A. FIG.

The guide roller 24 supports the upper band 23a from the rear surface side, and is disposed in parallel with the rotation shafts of the drums 21 and 22 at a pitch, for example, a 3.5 m pitch, in the running direction. As shown in FIG. 3, the guide roller 24 is fixed to the support frame 31 of the flexible chamber via the bearing 30. A damper 32 is disposed between the bearing 30 and the support frame 31.

The damper 32 is made of an elastomer, for example, a rubbery elastic body, and is compressed when the band 23 is in contact with the guide roller 24 so that the vertical drag acts. Thus, the vertical drag acts on the band 23 by the guide roller 24, for example, when the band tension is changed in the width direction left and right. When the band tension is changed from left to right, an uneven force is applied between the band 23 and the guide roller 24. Due to this nonuniform force, part of the band 23 is martensiated and deteriorated, or scratches occur on the surface of the guide roller 24. On the other hand, by forming the damper 32, a normal or more vertical drag does not act on the band 23. FIG. Therefore, martensitic band 23 made of austenitic stainless steel is suppressed by the vertical drag, and scratches and the like are not generated on the surface of the guide roller 24.

As shown in FIG. 2, the die 25 is disposed above the first drum 21. The die 25 continuously flows the dope 35 as the bead 36 with respect to the running band 23. As a result, the flexible film 37 is formed on the band 23. The dope 35 melt | dissolves cellulose acylate in a solvent, for example, is manufactured in the dope manufacturing line which is not shown in figure, and is supplied to the die 25.

As shown in FIG. 1, the decompression chamber 27 is formed upstream in the running direction of the band 23 with respect to the beads 36 from the die 25. This decompression chamber 27 sucks the atmosphere of the upstream area of the bead 36, decompresses the area, and reduces the vibration of the bead 36.

In order to improve the production speed, the cast film 37 directed to the peeling roller 28 is heated by the second drum 22 and the band 23. Moreover, in the flexible position, the band 23 is cooled by the first drum 21 so that the band 23 does not heat up excessively. Thus, each drum 21, 22 has a thermostat not shown.

A plurality of ducts 26 are formed side by side along the path of the band 23. Each duct 26 is connected to the warm air controller (all not shown) which has a blower, respectively, and blows dry air from an outlet. The warm air controller independently controls the temperature, humidity, and flow rate of the dry air. The temperature of the flexible membrane 37 is controlled by controlling the temperature and flow rate of the drying wind and the temperature control by the thermostat of the drums 21 and 22 itself, and the solvent is evaporated from the flexible membrane 37 to dry the flexible membrane 37. Proceeds. And the flexible film 37 is hardened so that conveyance in the 1st tenter 12 is possible, and self-supportability is provided.

The peeling roller 28 is formed near the peripheral surface of the 1st drum 21 with respect to the die | dye 25 upstream. The peeling roller 28 supports the casting film 37 when removing the casting film 37 in which the drying of the state containing a solvent advanced from the band 23. The peeled flexible film 37, ie, the film 40, is guided to the first tenter 12.

In the 1st tenter 12, the tension | tensile_strength in the film width direction is conveyed, conveying the film 40 by holding both edges of the film 40 with the clip 41, and sending dry air from the duct 42. FIG. It gives and expands the width of the film 40.

In the roll drying apparatus 13, the film 40 is wound up on many roll 45, and is conveyed. The atmosphere inside the roll drying apparatus 13 is controlled by the temperature controller which temperature, humidity, etc. are not shown, and the solvent evaporates from the film 40 while the film 40 is conveyed.

The second tenter 14 has the same structure as the first tenter 12 and has a clip 43 and a duct 44. The second tenter 14 stretches the film 40 while holding it by the clip 43. By this stretching, a film 40 having desired optical properties is obtained. In addition, the second tenter 14 may not be used depending on the optical properties of the film 40.

The slitter 15 cuts off the side part containing the holding trace by the clips 41 and 43 of the 1st tenter 12 and the 2nd tenter 14, respectively. The film 40 from which the side part was cut off is wound up by the winding device 16 in roll shape. The rolled film 40 obtained by this invention can be used especially for retardation film and a polarizing plate protective film.

In the said embodiment, although the rubbery elastic body is used as the damper 32, various dampers, such as a cylinder damper by hydraulic pressure or air pressure, can be used instead. For example, you may use the active damper 51, as shown in FIG.

The active damper 51 has a load cell 53 in the bearing 52. The signal corresponding to the vertical drag from the load cell 53 is sent to the signal processing unit 54. The signal processing unit 54 has a comparator, and the comparator compares a signal from the load cell 53 with a threshold value and sends a hydraulic signal to the hydraulic pressure adjusting unit 55 when the signal exceeds a predetermined value. The oil pressure adjusting unit 55 controls the oil pressure to be sent to the damper main body 50 based on the oil pressure signal, and applies oil pressure in the direction of decreasing the vertical drag.

The load cell 53 is arrange | positioned between the bearing 52a in the bearing 52, and the frame 52b. The damper main body 50 is disposed between the bearing 52 and the support frame 31 at the lower surface of the bearing 52. In the case of this embodiment, in order to control oil pressure based on the signal detected by the load cell 53, rapid attenuation control is attained, and the suppression effect of martensite is higher. Moreover, in order to suppress the vibration of the band 23 at the time of high speed film forming, the short deviation (thickness nonuniformity which arises periodically in the film longitudinal direction) which arises from the vibration of the band 23 is suppressed.

As shown in FIG. 5 without forming the damper 32 and the damper main body 50 in the bearings 30 and 52 which support the both ends of the rotating shaft 24a of the guide roller 24 like FIG. 3 or FIG. Similarly, the damper 60 may be disposed. In this case, the bearing 30 is attached to the movable plate 61, and the swing (swing) of this movable plate 61 is damped by the damper 60. As shown in FIG. And the movable plate 61 is comprised so that the movable plate 61 can be rocked freely in the vertical direction of the band width direction by the oscillation shaft 62 formed in the width direction center part of the band 23 below. The arm 63 protrudes below this movable plate 61. The arm 63 is provided with a damper 60 to suppress the swing of the movable plate 61. Moreover, the movable plate 61 is hold | maintained in the neutral position by the elastic support of the two coil springs 65. As shown in FIG. The damper 60 and the coil spring 65 are mounted to the support frame 31 via the brackets 66 and 67. In addition, although the damper 60 uses the hydraulic damper which consists of cylinders, you may use what consists of rubber-like elastic bodies as shown in FIG. 3, and what consists of active dampers as shown in FIG.

In each said embodiment, although the example which used the dampers 32 and 50 between the bearings 30 and 52 and the support frame 31 was demonstrated, as shown in FIG. 6, the guide roller 70 is a roller main body. You may comprise the 71, the rubber damper 72, the receiving sleeve 73, and the rotating shaft 74. As shown in FIG. The roller main body 71 is made of metal, and is made of, for example, stainless steel such as SUS304 or SUS316, stainless steel with hard chromium plating on the surface thereof. The rubber damper 72 is a cylindrical rubbery elastic body and is disposed between the roller body 71 and the receiving sleeve 73. When the bearing force of the band 23 increases and the vertical drag increases, the inclination angle of the roller main body 71 with respect to the rotating shaft 74 is changed by the rubber damper 72. As shown in FIG. Therefore, martensite of the band 23 by the vertical drag is suppressed. In addition, the guide roller 70 is attached to the support frame 31 via the bearing 75.

In the solution film forming equipment of the present invention, the width of the film as the product is preferably 600 mm or more, and more preferably 1400 mm or more and 2500 mm or less. Moreover, it is effective also when the width of a film is larger than 2500 mm. Moreover, it is preferable that the film thickness of a film is 20 micrometers or more and 80 micrometers or less. The polymer used as a raw material of a polymer film is not specifically limited, For example, a cellulose acylate, a cyclic polyolefin, etc. are mentioned.

Only one kind of acyl group may be used for the cellulose acylate of the present invention, or two or more kinds of acyl groups may be used. When using two or more types of acyl groups, it is preferable that one of them is an acetyl group. It is preferable that the ratio which esterifies the hydroxyl group of a cellulose with carboxylic acid, ie, the substitution degree of an acyl group, satisfy | fills all of following formula (I)-(III). In the following formulas (I) to (III), A and B represent a degree of substitution of an acyl group, A is a degree of substitution of an acetyl group, and B is a degree of substitution of an acyl group having 3 to 22 carbon atoms. to be. Moreover, it is preferable that 90 weight% or more of triacetyl cellulose (TAC) is 0.1 mm-4 mm of particle | grains.

(I) 2.0? A + B? 3.0

(II) 1.0? A? 3.0

(III) 0≤B≤2.9

It is more preferable that all substitution degrees A + B of an acyl group are 2.20 or more and 2.90 or less, and it is especially preferable that they are 2.40 or more and 2.88 or less. Moreover, it is more preferable that substitution degree B of the acyl group of C3-C22 is 0.30 or more, and it is especially preferable that it is 0.5 or more.

Details of the cellulose acylate are described in paragraphs [0140] to [0195] of JP 2005-104148 A. These descriptions can also be applied to the present invention. Moreover, about additives, such as a solvent and a plasticizer, a deterioration inhibitor, a ultraviolet absorber (UV agent), an optically anisotropic control agent, a retardation control agent, a dye, a mat agent, a peeling agent, and a peeling accelerator, are similarly JP-A-2005-104148 It is described in detail in paragraphs [0516] to [0516].

In order to confirm the effect by the damper of this invention, the experiment was implemented. In Example 1, the damper 32 which consists of a rubbery elastic body is arrange | positioned between the support frame 31 in the lower part of the bearing 30 as shown in FIG. In Example 2, the hydraulic damper (not shown) is used instead of the damper 32 of Example 1. FIG. In Example 3, as shown in FIG. 4, the active damper 51 is arrange | positioned between the lower part of the bearing 52, and the support frame 31. As shown in FIG. In Example 4, as shown in FIG. 5, the swing type movable plate 61 is formed, and the damper is acted so that the swing of this movable plate 61 may be suppressed, and the vertical drag is reduced. In Example 5, the damper 72 which consists of a rubber cylindrical body is arrange | positioned between the roller main body 71 which consists of metal cylinders, and the rotating shaft 74, as shown in FIG. Example 6 is comprised similarly to Example 3 except having used the rubber-lined guide roller disclosed by patent document 1 instead of the guide roller 24 shown in FIG. The rubber lined used the rubber (1) (fluorine rubber, JIS-A rubber hardness 60 degrees). Example 7 used rubber 2 (fluorine rubber, JIS-A rubber hardness 80 °) instead of rubber 1 for the lined rubber of Example 6. In addition, in each Example, all the examples are the same conditions except having changed the kind of the damper of the guide roller and the lined rubber.

In Comparative Example 1, the guide roller 24 made of stainless steel was simply supported by the bearing 30, and the damper 32 was not used. The comparative example 2 used the rubber lined guide roller disclosed by patent document 1, and the rubber uses the said rubber (1). In addition, the comparative example 3 is the same as the comparative example 2 except having used the said rubber (2) instead of the rubber (1) of the comparative example 2. In addition, it was set as the same conditions as Example 1 except not using a damper in Comparative Examples 1-3.

The results are shown in the table below.

Regarding Comparative Examples 1 to 3, there is endurance data based on the production results by actual machine (hatching area in Table 1). However, in each example, since the endurance time measured by a practical skill needs to be performed using a practical skill over a long period of time, it becomes unrealistic and expensive and it is difficult to perform a test. Therefore, by carrying out the accelerated durability test, many levels of tests are carried out at low cost, and endurance time data close to the actual practice is obtained.

First, the acceleration durability test which simulated the comparative examples 1-3 is performed, and the acceleration rate is calculated | required. For example, the acceleration rate is obtained by dividing the endurance time by the actual machine by the endurance time of the acceleration endurance test. This acceleration rate adopts the average value of a comparative example. In "wrinkle (continuous irregularities occurring in the running direction of the band) expression" and "roller surface deterioration", since the generation mechanism is different, an accelerated endurance test is performed for each. In this accelerated durability test, each value is measured every 24 hours (every day). In "wrinkle expression", the surface unevenness of a band is measured and compared with the comparative examples 1-3. In "roller surface deterioration", the surface unevenness of the guide roller 24 is measured and compared with the comparative examples 1-3. In this roller surface deterioration test, since evaluation criteria differ, each acceleration rate is employ | adopted by a metal roller and a rubber roller. The accelerated endurance test was conducted for 50 days.

The surface asperity measuring apparatus 76 shown in FIG. 7 was used for the measurement of surface asperity. The surface asperity measurement device 76 includes a laser displacement meter 77, a displacement gauge shift mechanism 78, and a personal computer 79. The laser displacement meter 77 has a sensor head 77a and a controller 77b and measures the displacement amount Sd due to the unevenness of the surface of the object to be measured, such as the band or the guide roller 24. This measured displacement amount data is sent to the personal computer 79 via the controller 77b.

The displacement gauge shift mechanism 78 is composed of a single-axis actuator having a servo motor 80, a ball screw 81, a guide rail 82, and a shift table 83. And the ball screw 81 is rotated by the rotation of the servomotor 80, and the shift table 83 screwed to this is moved on the guide rail 82. As shown in FIG. The sensor head 77a is fixed to the shift table 83 via the bracket 83a. As the shift table 83 moves, the sensor head 77a is shifted in the axial direction of the guide roller 24 as the measurement target. By this shift, the laser displacement meter 77 can continuously measure the displacement amount Sd due to the surface irregularities of the guide roller 24 along the axial direction of the guide roller 24, for example. The servo motor 80 is rotationally controlled by the servo motor controller 80a. The servo motor controller 80a sends the distance data from the end of the object to be measured to the personal computer 79. In the personal computer 79, an application for measuring surface irregularities is installed. This application calculates | requires the measurement displacement amount according to the distance from the edge part of a to-be-measured object based on the displacement amount data Sd of the surface asperity, and the distance data Dd. Moreover, the PV value of the surface asperity as a difference between the maximum value and minimum value in the measured displacement amount is calculated | required. The personal computer 79 has a display 79a, a keyboard or mouse, not shown. On the display 79a, a graph showing surface irregularities, a PV value in the graph, and the like are displayed while the distance from the end is taken as the horizontal axis and the measurement displacement is taken as the vertical axis.

In the accelerated endurance test, the surface unevenness PV is measured every day using the surface unevenness measuring device 76, and the value is higher than the PV value of the surface unevenness in the actual machine in Comparative Examples 1 to 3 One day was made into the endurance time of the accelerated endurance test. The PV value of the surface unevenness | corrugation by a real machine was measured about the "wrinkle expression" and "wrinkle film formation nonconformity" using the laser displacement meter 77 which can move a band uneven | corrugated shape in the width direction by the displacement meter shift mechanism 78. As shown in FIG. Also about "roller surface deterioration", PV value of the actual machine | machine was calculated | required by measuring the roller surface uneven | corrugated shape similarly.

The accelerated endurance test of wrinkle expression is performed as follows using the accelerated endurance test apparatus 90 shown in FIG. First, the same thing as a test band (test band piece 91) is made into the guide roller space | interval by a practical machine, and both ends are gripped and pulled and fixed by the holding | gripping tool 92 so that it may become the same tension as a practical machine. The tension fixing method of the test band piece 91 may employ | adopt an appropriate method. The guide roller 24 of a test object is arrange | positioned at the center position of the tension direction of the test band piece 91 which was installed. The vibration imparting device 93 is formed in this guide roller 24. The vibration imparting device 93 vibrates the guide roller device 95 fixed to the test bench 94 in the vertical direction. The guide roller device 95 has a guide roller 24, a bearing 30, a damper 32, and a mounting table 96, and the mounting table 96 is fixed to the test table 94. The amplitude and period at this time are determined based on the amplitude and period of the vibration of the actual band by the actual machine. By shortening the period of the vibration, the acceleration rate of the endurance test can be increased. In addition, although the vibration imparting apparatus 93 is formed in the guide roller apparatus 95 side in FIG. 8, the vibration imparting apparatus 93 is formed in the holding | gripping tool 92 instead of this, and the test band piece 91 You may give a vibration with respect to.

The accelerated durability test of roller surface deterioration is performed as follows using the accelerated durability test apparatus 97 shown in FIG. First, the guide roller 24 is pressed against the guide roller 24 of the guide roller apparatus 95 of a test object from a perpendicular direction upward, and the guide roller 24 is rotated. The drive roller 98 has a vibration imparting rotation mechanism 99. The vibration imparting rotation mechanism 99 makes the driving roller 98 contact the guide roller 24 at a predetermined contact pressure, and imparts vibration in the vertical direction while rotating at a predetermined rotational speed. Vibration is performed at an amplitude corresponding to the vibration of the actual band. Moreover, the rotation speed of a drive roller is determined according to the acceleration rate of an acceleration test. By setting the contact pressure between the drive roller 98 and the guide roller 24 to be higher than the contact pressure between the band of the actual machine and the guide roller, the acceleration rate can be increased. And the surface unevenness | corrugation of the guide roller 24 is measured every day using the surface unevenness | corrugation measuring apparatus 76. As shown in FIG.

In the said table, the determination criteria of the endurance time (years) calculated | required based on the accelerated durability test are as follows. Wrinkle expression was judged as being possible for more than 1.0 years, and less than 1.0 years. About Wrinkle film forming nonconformity, it was possible to make 2.5 years or more possible, and to determine that it was impossible for less than 2.5 years. About roller surface deterioration, it was possible to exceed one year and it judged that one year or less was impossible. The band position controllability was described as a reference without including this criterion. The object of the present invention is to prevent martensite of the band and to determine whether or not this point is satisfied. Therefore, in the comprehensive determination, when all of the wrinkle expression, the wrinkle film formation nonconformity, and the roller surface deterioration were possible, the evaluation was performed in three stages of "excellent", "good" and "possible" according to the superiority. In addition, when any one of them was impossible, comprehensive determination was determined to be impossible. In addition, when it determines that it is impossible to deteriorate by surface deterioration also in the band position controllability, the Examples 1-5 are more than comprehensive evaluation, and Examples 6, 7, and Comparative Examples 1-3 are In a comprehensive evaluation, it becomes impossible.

23: band
30: bearing
32: damper
50: damper body
51: active damper
53: load cell
60: damper
61: movable plate
62: rocking shaft
70: guide roller
71: roller body
72: damper
90, 97: accelerated endurance test device
91: test band
95: guide roller device

Claims (14)

An austenitic stainless steel band which is hung over a plurality of drums and travels by rotation of the respective drums,
A die for discharging a dope containing a polymer and a solvent onto the traveling band to form a flexible film;
A peeling roller that peels the flexible film on the band to form a film;
A guide roller disposed in parallel with each of the drums and supporting the band from an inner side in contact with an inner surface of the band;
A bearing for supporting the guide roller so as to rotate freely;
And a damper for supporting the guide roller so that the circumferential surface of the guide roller is inclined in the widthwise vertical plane of the band with respect to the band. The method according to claim 1,
The film forming equipment according to claim 1, wherein the guide roller is made of metal. The method according to claim 1,
And the damper is formed to support the bearing. 3. The method of claim 2,
And the damper is formed to support the bearing. The method according to claim 1,
A movable plate for supporting bearings on both sides of the guide roller;
It is formed in the width direction center of the said band, and further provided with the rocking support part which supports the said movable plate so that it can rock freely in the width direction vertical surface of the said band,
The damper is formed in a position for suppressing the swing of the movable plate. 3. The method of claim 2,
A movable plate for supporting bearings on both sides of the guide roller;
It is formed in the width direction center of the said band, and further provided with the rocking support part which supports the said movable plate so that it can rock freely in the width direction vertical surface of the said band,
The damper is formed in a position for suppressing the swing of the movable plate. The method according to claim 1,
The damper is formed to support the peripheral surface of the guide roller between the axis of rotation of the guide roller solution forming equipment. 3. The method of claim 2,
The damper is formed to support the peripheral surface of the guide roller between the axis of rotation of the guide roller solution forming equipment. 9. The method according to any one of claims 1 to 8,
The damper is a solution film production facility, an elastomer made of an elastomer. 7. The method according to any one of claims 3 to 6,
The damper is a flexible cylinder damper, solution filmmaking facility. 7. The method according to any one of claims 3 to 6,
The damper is a solution film production facility having a load cell, and is an active damper hydraulically controlled based on the pressure signal of the load cell. 11. The method of claim 10,
The guide roller is formed in a plurality of side by side between the drum, the damper is disposed on both sides of the guide roller, the solution film forming equipment. 12. The method of claim 11,
The guide roller is formed in a plurality of side by side between the drum, the damper is disposed on both sides of the guide roller, the solution film forming equipment. A band of austenitic stainless steel is rotated over a plurality of drums, and a dope containing a polymer and a solvent is discharged from a die on the surface of the band to form a cast film, and the cast film is peeled from the band to form a film. In the solution film forming method,
Supporting the band with a plurality of guide rollers,
And a damper supporting the guide roller with a damper such that a circumferential surface of the guide roller is inclined in a widthwise vertical plane with respect to the band.

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