JP5698720B2 - Solution casting equipment and method - Google Patents

Description

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

  Polymer films (hereinafter referred to as “films”) are widely used as optical functional films because of their features such as excellent light transmittance, flexibility, and light weight thinning. Among them, the cellulose ester film using cellulose acylate has high toughness, low optical anisotropy, low retardation, and is inexpensive, so that it is a liquid crystal display (LCD). It is widely used for protective films for polarizing plates, optical compensation films, antireflection films, viewing angle widening films, and the like.

  These optical functional films are manufactured by, for example, a solution casting method. In the solution casting method, a polymer is mainly dissolved in an organic solvent to prepare a dope, and then the dope is cast on a band that is continuously run over a plurality of drums, and the dope is peeled off and dried. To produce a film. In the solution casting method, austenitic stainless steel having high workability and excellent corrosion resistance and wear resistance is used as a band forming material.

  The band is supported from the inside by a guide roller, and vertical deflection and vibration are suppressed. For this reason, when the band comes into contact with each guide roller, vertical drag from the guide roller is applied. However, when austenitic stainless steel is used for the band, there is a problem that a part of the band becomes martensite due to this vertical drag.

  The martensite formation of the band due to the contact with the guide roller occurs substantially in parallel with the traveling direction of the band. Further, when the austenitic stainless steel becomes martensite, the volume expands. For this reason, the formation of martensite in the band appears as a streak-like deformation substantially parallel to the traveling direction and appears on the surface of the band. Such deformation on the surface of the band is transferred to the film and causes uneven thickness of the film.

  For this reason, in Patent Document 1, the vertical drag from the guide roller is reduced by rubber-lining the surface of the guide roller that supports the band that is stretched between the drums. This prevents the band from becoming martensitic and eliminates uneven thickness of the film. Moreover, in patent document 2, the vibration of the band at the time of high-speed film formation is suppressed by making the space | interval of a mutual guide roller into the fixed range in relation with the circumference of a guide roller. In Patent Document 3, the vibration of the band during high-speed film formation is suppressed by rotating the guide roller.

Japanese Patent Laid-Open No. 2008-221761 JP 2002-307460 A JP 2003-25352 A

  However, when the rubber-lined guide roller of Patent Document 1 is used, depending on the casting conditions, the lining rubber tends to deteriorate due to the solvent atmosphere or the high-temperature environment due to the backside heating, and the life is shortened. There is. Further, when the deterioration starts, the powder generated from the rubber accumulates between the band and the drum, causing the friction between the drum and the band to be non-uniform, and the position control of the band becomes difficult. In Patent Documents 2 and 3, since the guide roller is a metal roller and is in contact with the band, it cannot prevent martensite formation. For this reason, unevenness in thickness due to martensite formation occurs in the film.

  This invention is made | formed in view of the said subject, Comprising: When using austenitic stainless steel for the band which supports a cast film, it aims at preventing the martensite formation of a band.

In order to achieve the above object, the solution casting apparatus of the present invention is running a dope containing an austenitic stainless steel band, which is stretched over a plurality of drums and runs by the rotation of each drum, and a polymer and a solvent. A die that flows out onto the band to form a casting film, a peeling roller that peels off the casting film on the band to form a film, and is arranged substantially in parallel with each drum, and is in contact with the inner surface of the band. A guide roller for supporting the band from the side, a bearing for rotatably supporting the guide roller, and a damper provided so as to support the bearing so that the circumferential surface of the guide roller can be tilted within a plane perpendicular to the band in the width direction. It is characterized by providing. Further, the solution casting apparatus of the present invention flows over a traveling band of an austenitic stainless steel band that is stretched over a plurality of drums and travels by the rotation of each drum, and a dope including a polymer and a solvent. The die for forming a casting film, the peeling roller for peeling the casting film on the band to form a film, and the drum are arranged substantially in parallel with each other, and are in contact with the inner surface of the band to support the band from the inside. A guide roller; a bearing that rotatably supports the guide roller; and a damper that supports a circumferential surface of the guide roller so as to be tiltable within a vertical plane in the width direction with respect to the band. supporting, at the widthwise center of the movable plate band, swingably supported in the width direction vertical plane by pivot support portion, the damper is characterized in that it is provided at a position to suppress the oscillation of the movable plate

The guide roller preferably has a metal peripheral surface. Further, the damper may be composed of an elastomeric elastic body, an expansion / contraction type cylinder damper may be used, or an active damper having a load cell and hydraulically controlled based on a pressure signal of the load cell may be used.

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

In the solution casting method of the present invention, a band made of austenitic stainless steel is run around a plurality of drums and rotated, and a dope containing a polymer and a solvent is discharged from a die on the surface of the band to form a casting film. Then, in the solution casting method in which the casting film is peeled off from the band to form a film, the band is supported by a plurality of guide rollers, and a damper provided to support the bearing causes the peripheral surface of the guide roller to be in contact with the band. It is characterized in that it is supported so as to be inclined in a vertical plane in the width direction. Further, the solution casting method of the present invention is a casting film in which an austenitic stainless steel band is rotated around a plurality of drums, and a dope containing a polymer and a solvent is caused to flow out from a die onto the surface of the band. In the solution casting method in which the casting film is peeled off from the band to form a film, the band is supported by a plurality of guide rollers, the bearings on both sides of the guide roller are supported by the movable plate, and the movable plate is The circumference of the guide roller is inclined with respect to the band in the vertical direction in the width direction by the damper that is supported in the vertical direction in the width direction by the swing support part at the center of the width direction of the belt, and the damper that suppresses the swing of the movable plate. The support is possible.

  According to the present invention, the guide roller that contacts the inner surface of the band and supports the band from the inside is rotatably supported by the bearing, and the circumferential surface of the guide roller can be inclined in a plane perpendicular to the width direction with respect to the band. As a result of being supported by the above, excessive vertical drag is not applied to the band due to the buffering action of the damper. For this reason, when austenitic stainless steel is used for the band, the martensite of the band is prevented. Moreover, the film without thickness unevenness can be manufactured by preventing the martensite formation of the band.

It is a side view which shows the outline | summary of the solution casting apparatus of this invention. It is a perspective view which shows the outline | summary of a casting apparatus. It is a perspective view which shows the guide roller and band supported by the bearing which has a damper. It is a side view which shows the guide roller, bearing, and active damper in other embodiment. It is a front view of other embodiment which swings a guide roller in the width direction vertical plane in the center of the width direction of a band. It is a front view including the partial cross section which shows the guide roller of other embodiment which has a rubber damper between the internal peripheral surface of a metal cylinder and a rotating shaft. It is a front view which shows the outline | summary of a surface unevenness | corrugation measuring apparatus. It is a front view which shows the outline | summary of the accelerated durability test apparatus of a streak appearance. It is a front view which shows the outline | summary of the accelerated durability test apparatus of roller surface deterioration.

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

  As shown in FIG. 2, the casting apparatus 11 includes drums 21 and 22, an endless band 23 spanned between the drums 21 and 22, a guide roller 24, a die 25, and a duct (membrane dryer). 26, a decompression chamber 27 (see FIG. 1), and a peeling roller 28. The band 23 functions as a metal casting support body formed in an annular shape, and is stretched around the peripheral 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.

  The guide roller 24 supports the upper band 23a from the back surface side, and is disposed in parallel with the rotation axis of each of the drums 21 and 22 at an appropriate pitch in the traveling direction, for example, a pitch of 3.5 m. As shown in FIG. 3, the guide roller 24 is fixed to a support frame 31 of the casting chamber via a 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 rubber-like elastic body, and is compressed when the band 23 comes into contact with the guide roller 24 and a vertical drag acts. In this way, the vertical drag acts on the band 23 by the guide roller 24 when, for example, the band tension changes in the left and right directions in the width direction. When the band tension changes from right to left, a non-uniform force is applied between the band 23 and the guide roller 24. Due to this non-uniform force, a part of the band 23 becomes martensite and deteriorates, or the surface of the guide roller 24 is damaged. On the other hand, by providing the damper 32, a vertical drag exceeding a certain level does not act on the band 23. Therefore, the band 23 made of austenitic stainless steel is prevented from becoming martensite due to the normal force, and the surface of the guide roller 24 is not scratched.

  As shown in FIG. 2, a die 25 is disposed above the first drum 21. The die 25 continuously flows the dope 35 as a bead 36 with respect to the traveling band 23. As a result, a casting film 37 is formed on the band 23. The dope 35 is obtained by, for example, dissolving cellulose acylate in a solvent, and is produced by a dope production line (not shown) and supplied to the die 25.

  As shown in FIG. 1, a decompression chamber 27 is provided upstream of the bead 36 from the die 25 in the traveling direction of the band 23. The decompression chamber 27 sucks the atmosphere in the upstream area of the bead 36 to decompress the area, and reduces the vibration of the bead 36.

  In order to improve the production speed, the casting film 37 toward the peeling roller 28 is heated by the second drum 22 and the band 23. Further, at the casting position, the band 23 is cooled by the first drum 21 so that the temperature of the band 23 does not rise excessively. For this reason, each drum 21 and 22 has a temperature control device (not shown).

  A plurality of ducts 26 are provided along the traveling path of the band 23. Each duct 26 is connected to a hot air controller (both not shown) having a blower, and blows dry air from the outlet. The hot air controller controls the temperature, humidity, and flow rate of the drying air independently. The temperature of the casting film 37 is adjusted by controlling the temperature and flow rate of the drying air and the temperature control by the temperature adjusting device of the drums 21 and 22 themselves, and the solvent is evaporated from the casting film 37, Drying proceeds. Then, the casting film 37 is solidified to the extent that it can be conveyed by the first tenter 12 to give self-supporting property.

  A peeling roller 28 is provided near the peripheral surface of the first drum 21 on the upstream side in the running direction with respect to the die 25. The peeling roller 28 supports the casting film 37 when the casting film 37 that has been dried in a state containing a solvent is peeled off from the band 23. The cast film 37 that has been peeled off, that is, the film 40 is guided to the first tenter 12.

  In the first tenter 12, the side edges of the film 40 are gripped by the clip 41, and the drying air is sent from the duct 42 to apply tension in the film width direction while conveying the film 40. Increase the width.

  In the roll drying device 13, the film 40 is wound around a large number of rolls 45 and conveyed. The atmosphere inside the roll dryer 13 is controlled by a temperature controller (not shown) such as temperature and humidity, and the solvent evaporates from the film 40 while the film 40 is being transported.

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

  The slitter 15 cuts out the side portion including the retention marks by the clips 41 and 43 of the first tenter 12 and the second tenter 14. The film 40 whose side portions have been cut off is wound into a roll by the winding device 16. The roll film 40 obtained by the present invention can be used particularly for a retardation film and a polarizing plate protective film.

  In the above embodiment, a rubber-like elastic body is used as the damper 32, but various dampers such as a cylinder damper by hydraulic pressure or pneumatic pressure can be used instead. Further, for example, as shown in FIG. 4, an active damper 51 may be used.

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

  The load cell 53 is disposed between the bearing 52a in the bearing 52 and the frame body 52b. The damper body 50 is disposed between the bearing 52 and the support frame 31 on the lower surface of the bearing 52. In the case of the present embodiment, since the hydraulic pressure is controlled based on the signal detected by the load cell 53, quick damping control is possible, and the martensite suppression effect is higher. In addition, since the vibration of the band 23 during high-speed film formation is suppressed, step unevenness (thickness unevenness generated periodically in the film longitudinal direction) due to the vibration of the band 23 is suppressed.

  As shown in FIG. 5, the damper 60 may be disposed as shown in FIG. 5 without providing the damper 32 and the damper main body 50 on the bearings 30 and 52 that support both ends of the rotating shaft 24 a of the guide roller 24 as shown in FIG. 3 and FIG. 4. . In this case, the bearing 30 is attached to the movable plate 61, and the swing (swing) of the movable plate 61 is attenuated by the damper 60. Then, the movable plate 61 is configured to be swingable within a vertical plane in the band width direction by a swing shaft 62 downward at the center in the width direction of the band 23. An arm 63 projects below the movable plate 61. The arm 63 is provided with a damper 60 that suppresses the swing of the movable plate 61. Further, the movable plate 61 is held at the neutral position by the urging of the two coil springs 65. The damper 60 and the coil spring 65 are attached to the support frame 31 via brackets 66 and 67. Although the damper 60 uses a hydraulic damper made of a cylinder, a damper made of a rubber-like elastic body as shown in FIG. 3 or an active damper as shown in FIG. 4 may be used.

  In each of the above embodiments, the example in which the dampers 32 and 50 are used between the bearings 30 and 52 and the support frame 31 has been described. However, as illustrated in FIG. 6, the guide roller 70 is replaced with a roller body 71 and a rubber damper. 72, a receiving sleeve 73, and a rotating shaft 74. The roller body 71 is made of metal, and is made of, for example, a stainless material such as SUS304 or SUS316, a stainless material whose surface is subjected to hard chrome plating, or the like. The rubber damper 72 is a cylindrical rubber-like elastic body, and is disposed between the roller body 71 and the receiving sleeve 73. In the rubber damper 72, when the support force of the band 23 increases and the vertical drag is likely to increase, the inclination angle of the roller body 71 changes with respect to the rotation shaft 74, so that the band 23 becomes martensite due to the vertical drag. Is suppressed. The guide roller 70 is attached to the support frame 31 via a bearing 75.

  In the solution casting apparatus of the present invention, the width of the film as a product is preferably 600 mm or more, and more preferably 1400 mm or more and 2500 mm or less. It is also effective when the film width is greater than 2500 mm. The film thickness is preferably 20 μm or more and 80 μm or less. The polymer used as the raw material for the polymer film is not particularly limited, and examples thereof include cellulose acylate and cyclic polyolefin.

Only one type of acyl group may be used in the cellulose acylate of the present invention, or two or more types of acyl groups may be used. When two or more kinds of acyl groups are used, it is preferable that one of them is an acetyl group. The ratio in which the hydroxyl group of cellulose is esterified with carboxylic acid, that is, the substitution degree of the acyl group satisfies all of the following formulas (I) to (III) is preferable. In the following formulas (I) to (III), A and B represent the substitution degree of the acyl group, A is the substitution degree of the acetyl group, and B is the substitution degree of the acyl group having 3 to 22 carbon atoms. It is. Moreover, it is preferable that 90 weight% or more of triacetylcellulose (TAC) is a particle | grain of 0.1 mm-4 mm.
(I) 2.0 ≦ A + B ≦ 3.0
(II) 1.0 ≦ A ≦ 3.0
(III) 0 ≦ B ≦ 2.9

  The total substitution degree A + B of the acyl group is more preferably 2.20 or more and 2.90 or less, and particularly preferably 2.40 or more and 2.88 or less. Further, the substitution degree B of the acyl group having 3 to 22 carbon atoms is more preferably 0.30 or more, and particularly preferably 0.5 or more.

  Details of cellulose acylate are described in paragraphs [0140] to [0195] of JP-A-2005-104148. These descriptions are also applicable to the present invention. The same applies to additives such as solvents and plasticizers, deterioration inhibitors, ultraviolet absorbers (UV agents), optical anisotropy control agents, retardation control agents, dyes, matting agents, release agents, and release accelerators. JP-A-2005-104148 describes in detail in paragraphs [0196] to [0516].

  An experiment was conducted to confirm the effect of the damper of the present invention. In the first embodiment, as shown in FIG. 3, a damper 32 made of a rubber-like elastic body is disposed between the lower portion of the bearing 30 and the support frame 31. In the second embodiment, a hydraulic damper (not shown) is used instead of the damper 32 of the first embodiment. In the third embodiment, as shown in FIG. 4, an active damper 51 is arranged between the lower portion of the bearing 52 and the support frame 31. In the fourth embodiment, as shown in FIG. 5, a swing type movable plate 61 is provided, and a damper is actuated to suppress the swing of the movable plate 61, thereby reducing the vertical drag. In the fifth embodiment, as shown in FIG. 6, a damper 72 made of a rubber cylinder is disposed between a roller body 71 made of a metal cylinder and a rotating shaft 74. The sixth embodiment has the same configuration as that of the third embodiment except that a rubber-lined guide roller disclosed in Patent Document 1 is used instead of the guide roller 24 shown in FIG. As the lining rubber, rubber 1 (fluorine rubber, JIS-A rubber hardness 60 °) was used. In Example 7, rubber 2 (fluorine rubber, JIS-A rubber hardness 80 °) was used in place of the lined rubber in Example 6 instead of rubber 1. In each example, the conditions are the same in all examples, except that the damper of the guide roller and the type of lining rubber are changed.

  In Comparative Example 1, the stainless steel guide roller 24 is simply supported by the bearing 30 and the damper 32 is not used. Comparative Example 2 uses a rubber-lined guide roller disclosed in Patent Document 1, and the rubber 1 is used as the rubber. Comparative Example 3 is the same as Comparative Example 2 except that the rubber 2 is used instead of the rubber 1 of Comparative Example 2. In Comparative Examples 1 to 3, the conditions were the same as in Example 1 except that no damper was used.

The results are shown in the table below.

  Regarding Comparative Examples 1 to 3, there is endurance time data based on actual production results (hatched areas in Table 1). However, for each example, measuring the endurance time in the actual machine is unrealistic and costly because it is necessary to carry out using the actual machine for a long period of time, and it is difficult to perform the test. It is. Therefore, by executing accelerated durability tests, multi-level tests are performed at low cost, and endurance time data close to that of actual equipment is obtained.

  First, an accelerated durability test simulating Comparative Examples 1 to 3 is performed, and the acceleration rate is obtained. As the acceleration rate, for example, a value obtained by dividing a durability time in an actual machine by a durability time in an accelerated durability test is used. For this acceleration rate, the average value of the comparative example is adopted. Since the generation mechanism is different between “streak burr development” and “roller surface deterioration”, an accelerated durability test is performed for each. In this accelerated durability test, each value is measured every 24 hours (every day). In “striking”, the surface irregularities of the band are measured and compared with Comparative Examples 1 to 3. In “Roller surface deterioration”, the surface unevenness of the guide roller 24 is measured and compared with Comparative Examples 1 to 3. In this roller surface deterioration test, since the evaluation criteria are different, different acceleration rates are adopted for the metal roller and the rubber roller. The accelerated durability test was conducted for 50 days.

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

  The displacement meter shift mechanism 78 includes a single-axis actuator having a servo motor 80, a ball screw 81, a guide rail 82, and a shift base 83. Then, the ball screw 81 is rotated by the rotation of the servo motor 80, and the shift base 83 screwed with the ball screw 81 is moved on the guide rail 82. A sensor head 77a is fixed to the shift base 83 via a bracket 83a. The movement of the shift table 83 causes the sensor head 77a to shift in the axial direction of the guide roller 24 that is the object to be measured. By this shift, the laser displacement meter 77 can continuously measure the displacement amount Sd due to the surface unevenness of the guide roller 24 along, for example, the axial direction of the guide roller 24. The servo motor 80 is rotationally controlled by a 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. An application for measuring surface irregularities is installed in the personal computer 79. This application obtains a measurement displacement amount corresponding to the distance from the end of the object to be measured based on the displacement amount data Sd of the surface irregularities and the distance data Dd. Further, the PV value of the surface irregularities as a difference between the maximum value and the minimum value in the measured displacement amount is obtained. The personal computer 79 includes a display 79a, a keyboard and a mouse (not shown), and the like. The display 79a displays a graph representing the surface irregularity shape, the PV value in this graph, etc., with the distance from the edge as the horizontal axis and the measured displacement as the vertical axis.

  In the accelerated durability test, the surface roughness measurement device 76 is used to measure the PV value of the surface roughness every day, and compared with the PV value of the surface roughness in the actual machine in Comparative Examples 1 to 3, the number of days when the value exceeded. Is the durability time of the accelerated durability test. The PV value of the surface irregularities in the actual machine was measured using a laser displacement meter 77 that can move the band irregularity shape in the width direction by the displacement meter shift mechanism 78 for “streak burrs” and “unsuitable film formation”. For “roller surface deterioration”, the PV value of the actual machine was obtained by measuring the uneven surface of the roller surface in the same manner.

  The accelerated durability test for the development of streaks is performed as follows using an accelerated durability test apparatus 90 shown in FIG. First, the same thing as the test band (test band piece 91) is used as the distance between the guide rollers in the actual machine, and both ends are gripped by the gripper 92 so as to have the same tension as the actual machine, and are fixed by pulling. A method for appropriately pulling and fixing the test band piece 91 may be adopted. The test roller 24 to be tested is disposed at the center position of the tensioned test band piece 91 in the pulling direction. The guide roller 24 is provided with a vibration applying device 93. The vibration applying device 93 vibrates the guide roller device 95 fixed to the test table 94 in the vertical direction. The guide roller device 95 includes a guide roller 24, a bearing 30, a damper 32, and a mounting base 96, and the mounting base 96 is fixed to the test base 94. The amplitude and period at this time are determined based on the amplitude and period of the actual band vibration in the actual machine. By shortening the period of vibration, the acceleration rate of the durability test can be increased. In FIG. 8, the vibration applying device 93 is provided on the guide roller device 95 side. Instead, a vibration applying device 93 is provided on the gripper 92 to apply vibration to the test band piece 91. May be.

  The accelerated durability test for roller surface deterioration is performed as follows using an accelerated durability test apparatus 97 shown in FIG. First, the driving roller 98 is pressed against the guide roller 24 of the guide roller device 95 to be tested from above in the vertical direction to rotate the guide roller 24. The drive roller 98 has a vibration applying rotation mechanism 99. The vibration applying rotation mechanism 99 brings the drive roller 98 into contact with the guide roller 24 with a predetermined contact pressure, and applies vibration in the vertical direction while rotating at a predetermined rotation speed. The vibration is performed with an amplitude corresponding to the vibration of the actual band. The rotation number of the driving roller is determined according to the acceleration rate of the acceleration test. The acceleration rate can be increased by setting the contact pressure between the driving 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. Then, the surface unevenness of the guide roller 24 is measured every day using the surface unevenness measuring device 76.

  In the above table, the criteria for determining the durability time (year) determined based on the accelerated durability test are as follows. As for streak expression, 1.0 year or more was judged as acceptable, and less than 1.0 year was judged as impossible. About unsuitable filming of streaks, it was determined that 2.5 years or more was acceptable and less than 2.5 years was unacceptable. Regarding the roller surface deterioration, it was determined that the roller surface deterioration exceeded 1 year and that it was determined that the roller surface deterioration was 1 year or less. The band position controllability was described as a reference without being included in the present criteria. The object of the present invention is to prevent the band from becoming martensite, and this is because it is determined whether or not this point is satisfied. Therefore, in the comprehensive judgment, when all of streak appearance, unsuitable streak film formation, and roller surface deterioration were possible, the evaluation was made in three stages, “excellent”, “good”, and “good”. Moreover, when even one was impossible, it was determined that comprehensive judgment was impossible. In addition, in the case where the band position controllability is also included in the determination criteria and it is determined that the deterioration due to the surface deterioration is impossible, Examples 1 to 5 can be comprehensive evaluation, and Examples 6 and 7 and Comparative Examples 1-3 are not allowed in the overall evaluation.

23 Band 30 Bearing 32 Damper 50 Damper Main Body 51 Active Damper 53 Load Cell 60 Damper 61 Movable Plate 62 Oscillating Shaft 70 Guide Roller 71 Roller Main Body 72 Damper 90, 97 Acceleration Durability Test Device 91 Test Band Piece 95 Guide Roller Device

Claims (8)

A band made of austenitic stainless steel that is stretched over a plurality of drums and runs by the rotation of each drum;
A die for flowing a dope containing a polymer and a solvent onto the running band to form a cast film;
A peeling roller that peels off the casting film on the band to form a film;
A guide roller that is arranged substantially parallel to each of the drums and contacts the inner surface of the band to support the band from the inside;
A bearing that rotatably supports the guide roller;
A solution casting apparatus comprising: a damper provided so as to support the bearing, and a peripheral surface of the guide roller supported so as to be able to incline within a plane perpendicular to the width direction with respect to the band. A band made of austenitic stainless steel that is stretched over a plurality of drums and runs by the rotation of each drum;
A die for flowing a dope containing a polymer and a solvent onto the running band to form a cast film;
A peeling roller that peels off the casting film on the band to form a film;
A guide roller that is arranged substantially parallel to each of the drums and contacts the inner surface of the band to support the band from the inside;
A bearing that rotatably supports the guide roller;
A damper that supports a circumferential surface of the guide roller so as to be tiltable within a plane perpendicular to the width direction with respect to the band;
Bearings on both sides of the guide roller are supported by a movable plate, and the movable plate is supported at the center in the width direction of the band so as to be swingable in a vertical plane in the width direction by a swing support portion, and the damper is movable. A solution casting apparatus characterized by being provided at a position that suppresses the swinging of the plate . The solution casting apparatus according to claim 1 or 2, wherein the guide roller has a metal peripheral surface. 4. The solution casting apparatus according to claim 1, wherein the damper is a telescopic cylinder damper. 4. The solution casting apparatus according to claim 1, wherein the damper is an active damper that includes a load cell and is hydraulically controlled based on a pressure signal of the load cell. 5. 6. The solution casting apparatus according to claim 4 or 5 , wherein a plurality of the guide rollers are provided side by side between the drums, and the dampers are disposed on both sides of the guide rollers. A band made of austenitic stainless steel is rolled over a plurality of drums, and a casting film is formed on the surface of the band by flowing a dope containing a polymer and a solvent from a die, and the casting film is In the solution casting method to peel off from the band to make a film,
The band is supported by a plurality of guide rollers,
The damper is provided to support the bearing, a solution casting method, wherein a circumferential surface of the guide roller is tiltable supported in the width direction perpendicular plane to said band. A band made of austenitic stainless steel is rolled over a plurality of drums, and a casting film is formed on the surface of the band by flowing a dope containing a polymer and a solvent from a die, and the casting film is In the solution casting method to peel off from the band to make a film,
  The band is supported by a plurality of guide rollers,
  The bearings on both sides of the guide roller are supported by a movable plate,
The movable plate is supported at the center in the width direction of the band so as to be swingable in the vertical plane by the swing support portion,
A solution casting method, wherein a peripheral surface of the guide roller is supported by a damper that suppresses swinging of the movable plate so as to be inclined with respect to the band in a plane perpendicular to the width direction.

Images