TWI594876B - Equipment and method for solution film formation - Google Patents

Description

Solution film making equipment and method

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

A polymer film (hereinafter referred to as a film) is used as an optical functional film in various fields because of its excellent light transmittance or flexibility and the advantage of being lightweight and film-forming. Among them, a cellulose ester film such as cellulose acylate has high toughness, low optical anisotropy, and low retardation, and is more inexpensive, and thus is widely used for liquid crystal. A constituent film of a liquid crystal display (LCD), that is, a protective film of a polarizing plate, an optical compensation film, an antireflection film, or a viewing angle widening film.

These optically functional films are produced, for example, by a solution film forming method. The solution film forming method is to produce a film by dissolving a polymer mainly in an organic solvent to prepare a dope, and then casting the dope on a plurality of drums for continuous walking. On the band, the dope is stripped and dried. In the solution film forming method, austenite-based stainless steel which is excellent in workability, corrosion resistance, and wear resistance is used as a material for forming a belt.

The belt is supported from the inside by a guide roll, and the deflection or vibration in the vertical direction is suppressed. Therefore, when in contact with the respective guide rolls, vertical resistance from the guide rolls is applied to the belt. However, in the case of stainless steel using an austenitic system, there is a problem that a part of martensite of the belt is caused by the vertical resistance.

The martensite of the belt due to contact with the guide rolls is generated substantially in parallel with the traveling direction of the belt. Moreover, if the stainless steel of the austenitic system is martensitized, the volume will expand. Therefore, the martensite of the belt causes a grain-like deformation substantially parallel to the traveling direction, and appears on the surface of the belt. Such deformation of the surface of the belt is transferred to the film, which is a cause of uneven thickness of the film.

Therefore, in Patent Document 1, rubber lining is applied to the surface of the guide roller that supports the belt between the rollers, thereby reducing the vertical resistance from the guide roller. Thereby, martensite of the tape can be prevented, and thickness unevenness of the film can be eliminated. Further, in Patent Document 2, the relationship between the interval between the guide rolls and the circumference of the guide rolls is within a certain range, thereby suppressing the vibration of the belt at the time of high-speed film formation. In Patent Document 3, the rotation of the guide roller is driven to suppress the vibration of the belt at the time of high-speed film formation.

[Prior Art Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2008-221761

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2002-307460

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2003-25352

However, in the case of Patent Document 1, the use of a rubber-coated guide roller is used. In other cases, there is a problem in that, depending on the casting conditions, the applied rubber is likely to be deteriorated due to a high temperature environment caused by a solvent environment or back surface heating, and the life is shortened. Further, once the deterioration starts, the powder generated from the rubber stays between the belt and the drum, which causes the friction between the drum and the belt to become uneven, and the positional control of the belt becomes difficult. In Patent Document 2 and Patent Document 3, since the guide roller is a metal roller and is in contact with the belt, martensite cannot be prevented. Therefore, the film may have thickness unevenness due to martensite.

The present invention has been made in view of the above problems, and an object thereof is to prevent martensite of a belt when an austenitic stainless steel is used for a belt supporting a cast film.

In order to achieve the above object, the solution film forming apparatus of the present invention is characterized in that it comprises a belt made of austenitic stainless steel, which is mounted on a plurality of rollers and travels by rotation of the respective rollers; a die which contains a polymer The concentrated liquid with the solvent is sprayed onto the running belt to form a cast film; the stripping roller is used to strip the cast film on the belt as a film; the guide rolls are arranged in parallel with the respective rolls, and the inner surface of the belt The belt is supported from the inside while being supported; the holder is rotatably supported by the guide roller; and a damper is provided so that the circumferential surface of the guide roller can support the guide roller obliquely in the vertical direction in the width direction of the belt with respect to the belt.

In addition, the "parallel arrangement" as used herein includes a case where the guide rolls are arranged substantially in parallel with respect to the respective rollers.

Further, it is preferable that the circumferential surface of the guide roller is made of metal. Preferably, the damper is provided in such a manner as to support the pedestal. Moreover, it may further comprise: a movable plate supporting both sides of the guide roller And the swing support portion is provided at the center in the width direction of the belt, and movably supports the movable plate in the vertical direction in the width direction of the belt, and a damper is provided at a position where the swing of the movable plate is suppressed. Further, the damper may be provided in such a manner as to support the circumferential surface of the guide roller between the rotation shaft of the guide roller. The damper may be composed of an elastomer made of an elastomer, using a telescopic cylinder damper, or an active damper having a load cell, and The hydraulic pressure is controlled based on the pressure signal of the load cell.

Preferably, the guide rolls are arranged in plurality between the respective rolls, and the dampers are disposed on both sides of the guide rolls.

In the solution film forming method of the present invention, a belt made of austenitic stainless steel is erected on a plurality of rolls and rotatably driven, and a dope containing a polymer and a solvent is ejected from a mold onto a surface of the belt to form a cast film. The strip casting film is stripped as a film, and the solution film forming method is characterized in that the belt is supported by a plurality of guide rolls so that the circumferential surface of the guide rolls can be obliquely passed through the damper in the width direction perpendicular to the belt with respect to the belt. Support the guide roller.

According to the present invention, the guide roller is rotatably supported by the holder, and the guide roller is in contact with the inner surface of the belt to support the belt from the inner side, and the circumferential surface of the guide roller is inclined in the vertical direction in the width direction with respect to the belt It is supported by the damper, whereby the buffering action of the damper does not exert excessive vertical resistance to the belt. Therefore, when austenitic stainless steel is used for the belt, martensite of the belt can be prevented. Further, by preventing martensite of the belt, it is possible to produce a film having no thickness unevenness.

10‧‧‧solution film making equipment

11‧‧‧casting device

12‧‧‧1st tenter

13‧‧‧Roll drying device

14‧‧‧2nd tenter

15‧‧‧cutting machine

16‧‧‧Winding device

21‧‧‧Roller

22‧‧‧Roller

23‧‧‧With

23a‧‧‧Upper side belt

24‧‧‧guide roller

24a, 74‧‧‧ rotating shaft

25‧‧‧Mold

26, 42, 44‧ ‧ pipes

27‧‧‧Decompression chamber

28‧‧‧ Stripping roller

30, 52, 75‧‧‧ support

31‧‧‧Support frame

32‧‧‧ damper

35‧‧‧Liquor

36‧‧‧Liquid beads

37‧‧‧cast film

40‧‧‧ film

41, 43‧‧ ‧ fixture

45‧‧‧ reel

50‧‧‧damper body

51‧‧‧Active damper

52a‧‧‧ Bearing

52b‧‧‧ frame

53‧‧‧Measurement components

54‧‧‧Signal Processing Department

55‧‧‧Hydraulic Control Department

60‧‧‧damper

61‧‧‧ movable plate

62‧‧‧swing axis

63‧‧‧ Arm

65‧‧‧Coil spring

66, 67, 83a‧‧‧ bracket

70‧‧‧guide roller

71‧‧‧ Roller body

72‧‧‧ damper

73‧‧‧ housing sleeve

76‧‧‧ Surface unevenness measuring device

77‧‧‧Laser Displacement Meter

77a‧‧‧Sensor head

77b‧‧‧ Controller

78‧‧‧Displacement meter moving mechanism

79‧‧‧PC

79a‧‧‧ display

80‧‧‧Servo motor

80a‧‧‧Servo motor controller

81‧‧‧Rolling screw

82‧‧‧rails

83‧‧‧Mobile station

90, 97‧‧‧Accelerated fatigue test device

91‧‧‧Test strips

92‧‧‧Scratch pieces

93‧‧‧Vibration giving device

94‧‧‧ test bench

95‧‧‧guide roller device

96‧‧‧Installation table

98‧‧‧Drive roller

99‧‧‧Vibration imparted to the rotating mechanism

A‧‧‧ arrow

Dd‧‧‧ distance data

Sd‧‧‧ displacement data

Fig. 1 is a side view showing an outline of a solution film forming apparatus of the present invention.

Fig. 2 is a perspective view showing an outline of a casting device.

Fig. 3 is a perspective view showing a guide roller and a belt supported by a holder having a damper.

4 is a side view showing a guide roller, a holder, and an active damper in another embodiment.

Fig. 5 is a front elevational view showing another embodiment in which the guide roller is swung in the center in the width direction of the belt and swings in the vertical plane in the width direction.

Fig. 6 is a front elevational view 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. 7 is a front elevational view showing an outline of a surface unevenness measuring device.

Fig. 8 is a front elevational view showing an outline of an accelerated fatigue testing device for horizontal stripes.

Fig. 9 is a front elevational view showing an outline of an accelerated fatigue tester for deteriorating the surface of the roll.

(solution film making equipment)

As shown in Fig. 1, the solution film forming 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. The device 16 is connected in series from the upstream side.

As shown in Fig. 2, the casting device 11 is provided with a drum 21, a drum 22, an endless belt 23 that is stretched over the drum 21 and the drum 22, a guide roller 24, a mold 25, and a duct (film dryer). 26; a decompression chamber 27 (refer to FIG. 1); and a stripping roller 28. The belt 23 is cast as a metal formed into a ring shape The support body functions and is mounted on the circumferential surfaces of the first roller 21 and the second roller 22 . The first roller 21 is rotationally driven by a motor (not shown), whereby the belt 23 travels in the first direction indicated by the arrow A.

The guide roller 24 supports the upper side belt 23a from the back side, and is disposed in parallel with the rotation axes of the respective drums 21 and the drums 22 at an appropriate pitch (for example, a pitch of 3.5 m) in the traveling direction. As shown in FIG. 3, the guide roller 24 is fixed to the support frame 31 of the casting chamber via the holder 30. A damper 32 is disposed between the holder 30 and the support frame 31.

The damper 32 is made of an elastic material, for example, a rubber-like elastic body, and is compressed when the belt 23 contacts the guide roller 24 and the vertical resistance acts. Thus, the vertical resistance acts on the belt 23 by the guide roller 24, for example, when the band tension changes in the width direction. When the belt tension changes to the left and right, an uneven force is applied between the belt 23 and the guide roller 24. Due to this uneven force, a part of the belt 23 is martensited and deteriorated, or a scratch is formed on the surface of the guide roller 24. On the other hand, by providing the damper 32, no more than a certain vertical resistance acts on the belt 23. Therefore, the phenomenon that the belt 23 containing the austenitic stainless steel is martensitic due to the vertical resistance is suppressed, and no frictional scratch or the like is generated on the surface of the guide roller 24.

As shown in FIG. 2, the mold 25 is placed above the first drum 21. The mold 25 causes the dope 35 to become a bead 36 and continuously flows toward the traveling belt 23. Thereby, the casting film 37 is formed on the belt 23. The dope 35 is obtained by dissolving deuterated cellulose in a solvent, for example, and is produced by a liquid production line (not shown). Give to the mold 25.

As shown in FIG. 1, a decompression chamber 27 is provided upstream of the traveling direction of the belt 23 with respect to the liquid droplet 36 from the mold 25. The decompression chamber 27 suctions the environment of the upstream side area of the liquid droplet 36, and decompresses the area to reduce the vibration of the liquid droplet 36.

In order to increase the manufacturing speed, the casting film 37 facing the stripping roller 28 is heated by the second roller 22 and the belt 23. Further, at the casting position, the belt 23 is cooled by the first drum 21 so as not to excessively raise the temperature of the belt 23. Therefore, each of the drum 21 and the drum 22 has a temperature adjustment device (not shown).

The ducts 26 are arranged in series along the traveling path of the belt 23. Each of the ducts 26 is connected to a heater controller (both not shown) having a blower, and blows dry air from the outflow port. The heater controller independently controls the temperature, humidity, and flow of the dry wind. The temperature of the casting film 37 is adjusted by the temperature and flow rate control of the drying wind and the temperature control of the drum 21 and the drum 22 itself by the temperature adjusting means, so that the solvent is evaporated from the casting film 37, and the casting film 37 is dried. . Further, the casting film 37 is cured to such an extent that it can be conveyed by the first tenter 12, and is provided with self-supportability.

A peeling roller 28 is provided in the vicinity of the upstream side of the mold 25 in the traveling direction and in the vicinity of the circumferential surface of the first roller 21. The peeling roller 28 supports the casting film 37 when the casting film 37 which is in a state containing a solvent and has been dried is peeled off from the belt 23. The peeled cast film 37, that is, the film 40, is guided to the first tenter 12.

In the first tenter 12, the film 40 is gripped by a clip 41 By conveying the dry air from the duct 42 on both side edges, the film 40 is conveyed, and the tension in the film width direction is applied to stretch the width of the film 40.

In the roll drying device 13, the film 40 is wound around a plurality of rolls 45 and conveyed. In the internal environment of the reel drying device 13, temperature, humidity, and the like are adjusted by a temperature adjuster (not shown), and the solvent evaporates from the film 40 while the film 40 is being conveyed.

The second tenter 14 has the same configuration as that of the first tenter 12, and has a jig 43 and a duct 44. The second tenter 14 holds and stretches the film 40 by the jig 43. By this stretching, a film 40 having desired optical characteristics is produced. Further, depending on the optical characteristics of the film 40, the second tenter 14 may not be used.

The slitter 15 cuts off the side portion including the holding marks by the respective clamps 41 and the clamps 43 of the first tenter 12 or the second tenter 14. The film 40 from which the side portion has been cut is wound into a roll shape by the winding device 16. The rolled film 40 obtained by the present invention is particularly useful for a retardation film or 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 based on hydraulic pressure or air pressure may be used instead. Further, for example, as shown in FIG. 4, the active damper 51 may be used.

The active damper 51 has a load cell 53 within the abutment 52. A signal corresponding to the vertical resistance from the load cell 53 is sent to the signal processing unit 54. The signal processing unit 54 has a comparator that compares the signal from the load cell 53 with a threshold value and sends a hydraulic pressure signal to the hydraulic pressure adjusting unit 55 when the signal exceeds a certain value. In the hydraulic pressure adjusting portion 55, the transmission to the damping is controlled based on the hydraulic pressure signal The hydraulic pressure of the body 50 applies a hydraulic pressure in a direction in which the vertical resistance is reduced.

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

Alternatively, the damper 32 or the damper body 50 may be provided to the holder 30 and the holder 52 which support both ends of the rotation shaft 24a of the guide roller 24 as shown in FIG. 3 or FIG. 4, and the damper may be disposed as shown in FIG. 60. At this time, the holder 30 is attached to the movable plate 61, and the swing of the movable plate 61 is attenuated by the damper 60. In addition, the movable shaft 61 is configured to be swingable in the vertical plane of the belt width direction by the swing shaft 62 provided at the lower portion in the center portion in the width direction of the belt 23. Below the movable plate 61, an arm 63 is protruded. A damper 60 that suppresses the swing of the movable plate 61 is provided on the arm 63. Further, the movable plate 61 is held at the neutral position by the energization of the two coil springs 65. The damper 60 or the coil spring 65 is attached to the support frame 31 via a bracket 66 and a bracket 67. Further, the damper 60 is a hydraulic damper including a cylinder, but a damper including a rubber-like elastic body shown in FIG. 3 or a damper including an active damper shown in FIG. 4 may be used.

In each of the above embodiments, an example in which the damper 32 and the damper 50 are used between the holder 30 and the support 52 and the support frame 31 has been described, but it is also possible as shown in FIG. 6. As shown, the guide roller 70 is composed of a roller body 71, a rubber damper 72, a receiving sleeve 73, and a rotating shaft 74. The roller body 71 is made of metal, and includes, for example, a stainless steel material such as SUS304 or SUS316, or a stainless steel material having a surface treated with hard chrome plating. The rubber damper 72 is a cylindrical rubber-like elastic body and is disposed between the roller body 71 and the accommodating sleeve 73. When the supporting force of the belt 23 is increased and the vertical resistance is to be increased, the inclination angle of the roller body 71 with respect to the rotating shaft 74 is changed by the rubber damper 72. Therefore, martensite of the belt 23 due to the vertical resistance is suppressed. Further, the guide roller 70 is attached to the support frame 31 via the holder 75.

In the solution film forming 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. In addition, it is effective when the width of the film is more than 2,500 mm. Further, the film thickness of the film is preferably 20 μm or more and 80 μm or less. The polymer which is a raw material of the polymer film is not particularly limited, and examples thereof include deuterated cellulose and cyclic polyolefin.

The mercapto group used in the deuterated cellulose of the present invention may be only one type, or two or more kinds of mercapto groups may be used. When two or more mercapto groups are used, it is preferred that one of the mercapto groups is an ethyl group. The ratio of the hydroxyl group of the cellulose to the esterification of the carboxylic acid, that is, the substitution ratio of the thiol group preferably satisfies all of the following formulas (I) to (III). Further, in the following formulas (I) to (III), A and B represent a substitution ratio of a mercapto group, A is a substitution ratio of an ethyl group, and B is a mercapto group having 3 to 22 carbon atoms. Replacement rate. Further, 90% by weight or more of triacetyl cellulose (TAC) is preferably 0.1 mm to 4 mm.

(I) 2.0≦A+B≦3.0

(II) 1.0≦A≦3.0

(III)0≦B≦2.9

The total substitution ratio A+B of the fluorenyl 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 ratio B of the fluorenyl group having 3 to 22 carbon atoms is more preferably 0.30 or more, and particularly preferably 0.5 or more.

The details of the deuterated cellulose are described in paragraphs [0140] to [0195] of JP-A-2005-104148. These descriptions can also be applied to the present invention. Moreover, additives such as solvents and plasticizers, anti-aging agents, ultraviolet absorbers (UV agents), optical anisotropy control agents, retardation control agents, dyes, matting agents, strippers, and stripping accelerators are also available in Japanese patents. It is also described in detail in paragraphs [0196] to [0516] of JP-A-2005-104148.

Experiments were conducted in order to confirm the effect of the damper of the present invention. In the first embodiment, as shown in FIG. 3, a damper 32 including a rubber-like elastic body is disposed between the lower portion of the holder 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 disposed between the lower portion of the holder 52 and the support frame 31. In the fourth embodiment, as shown in Fig. 5, a swing type movable plate 61 is provided to cause the damper to act to suppress the swing of the movable plate 61, thereby reducing the vertical resistance. In the fifth embodiment, as shown in Fig. 6, a package is disposed between the roller body 71 including the metal cylinder and the rotary shaft 74. A damper 72 comprising a rubber cylinder. In the sixth embodiment, the same structure as that of the third embodiment was employed except that the guide roller 24 shown in Patent Document 1 was used instead of the guide roller 24 shown in Fig. 3 . The rubber to be applied was rubber 1 (fluororubber, JIS-A rubber hardness of 60°). In Example 7, in the rubber coated in Example 6, rubber 2 (fluororubber, JIS-A rubber hardness of 80°) was used instead of rubber 1. Further, in each of the examples, the same conditions were employed in the respective examples except that the damper of the guide roller or the type of the rubber to be applied was changed.

In Comparative Example 1, the stainless steel guide roller 24 was supported only by the holder 30, and the damper 32 was not used. In Comparative Example 2, a rubber-coated guide roller disclosed in Patent Document 1 was used, and the rubber 1 was used for the rubber. Further, Comparative Example 3 was the same as Comparative Example 2 except that the above rubber 2 was used instead of the rubber 1 of Comparative Example 2. Further, in Comparative Examples 1 to 3, the same conditions as in Example 1 were employed except that the damper was not used.

The results of the implementation are shown in the following table.

Regarding Comparative Example 1 to Comparative Example 3, there were fatigue time data (shaded areas in Table 1) based on the actual production performance in the actual machine. However, in each of the embodiments, in order to measure the fatigue time in the actual machine, it is necessary to use a real machine for long-term implementation, which is unrealistic and costly, and it is difficult to perform the test. Therefore, by performing the accelerated fatigue test, a multi-level test is performed at low cost, and fatigue time data similar to the implementation in the actual machine is obtained.

First, the accelerated fatigue tests of Comparative Comparative Example 1 to Comparative Example 3 were carried out, and the acceleration rate was determined. The acceleration rate is, for example, a value obtained by dividing the fatigue time in the actual machine by the fatigue time of the accelerated fatigue test. This acceleration rate is the average value of the comparative examples. In the case of "horizontal grain (continuous unevenness generated in the traveling direction of the tape)" and "roller surface deterioration", since the mechanism is different, the accelerated fatigue test is performed. In this accelerated fatigue test, each value was measured every 24 hours (every day). For the "horizontal appearance", the surface unevenness of the tape was measured and compared with Comparative Example 1 to Comparative Example 3. The surface irregularities of the guide rolls 24 were measured for "roll surface deterioration", and compared with Comparative Examples 1 to 3. For the roll surface deterioration test, since the evaluation criteria were different, the respective acceleration rates were adopted for the metal roll and the rubber roll. The accelerated fatigue test was carried out for 50 days.

The measurement of the surface unevenness is performed using the surface unevenness measuring device 76 shown in Fig. 7 . The surface unevenness measuring device 76 has a laser displacement meter 77, a displacement meter shifting 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 belt or the guide roller 24. The measured displacement amount data is sent to the personal computer 79 via the controller 77b.

The displacement gauge moving mechanism 78 includes a single-axis actuator having a servo motor 80, a ball screw 81, a guide rail 82, and a moving table 83. Then, the ball screw 81 is rotated by the rotation of the servo motor 80, and the moving table 83 screwed to the ball screw 81 is moved on the guide rail 82. The sensor head 77a is fixed to the mobile station 83 via the bracket 83a. By the movement of the moving table 83, the sensor head 77a moves in the axial direction of the guide roller 24 as the object to be measured. By this movement, the laser displacement meter 77 can continuously measure the displacement amount Sd due to the surface unevenness of the guide roller 24 along the axial direction of the guide roller 24, for example. The servo motor 80 is subjected to rotation control 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 the surface unevenness is installed. The application calculates the measured 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 unevenness and the distance data Dd. Then, the PV value of the surface unevenness as the difference between the maximum value and the minimum value in the measured displacement amount is obtained. The personal computer 79 has a display 79a, a keyboard (not shown), a mouse, and the like. In the display 79a, the distance from the end is taken as the horizontal axis, and the measured displacement is the vertical axis, and a graph indicating the surface unevenness and a PV value in the graph are displayed.

In the accelerated fatigue test, the PV value of the surface unevenness was measured every day using the surface unevenness measuring device 76, and the table in the actual machine in Comparative Example 1 to Comparative Example 3 The PV values of the surface irregularities were compared, and the number of days over which the value was exceeded was taken as the fatigue time of the accelerated fatigue test. The PV value of the surface unevenness in the actual machine is measured by the laser displacement meter 77 for "horizontal appearance" and "irregularity of the horizontal grain formation", and the laser displacement gauge 77 can be moved by the displacement meter. 78 moves in the width direction. Similarly to the "roll surface deterioration", the PV value of the actual machine was also determined by measuring the uneven shape of the roll surface.

The accelerated fatigue test for the horizontal stripes appears by using the accelerated fatigue test device 90 shown in Fig. 8 in the following manner. First, the same test strip (test strip 91) is set as the guide roller spacing in the real machine, and the gripper 92 is used to grasp and stretch the fixed ends by the same tension as the real machine. . The method of stretching and fixing the test strip 91 can employ an appropriate method. A guide roller 24 as a test object is disposed at a central position in the stretching direction of the stretched test strip 91. A vibration imparting device 93 is provided on the guide roller 24. The vibration applying device 93 vibrates the guide roller device 95 fixed to the test stand 94 in the vertical direction. The guide roller device 95 has a guide roller 24, a holder 30, a damper 32, and a mounting table 96, and the mounting table 96 is fixed to the test stand 94. The amplitude and period at this time are determined based on the amplitude and period of the vibration of the actual belt in the actual machine. By shortening the vibration period, the acceleration rate of the fatigue test can be increased. In addition, in FIG. 8, although the vibration imparting device 93 is provided in the side of the roller guide device 95, the vibration imparting device 93 may be provided in the gripper 92 instead, and vibration may be applied to the test strip 91.

The accelerated fatigue test of the surface deterioration of the roll was carried out in the following manner using the accelerated fatigue test device 97 shown in Fig. 9 . First, with respect to the guide roller 24 of the guide roller device 95 as a test object, the drive roller 98 is pressed upward from the vertical direction and brought into contact with the guide roller 24 to rotate the guide roller 24. The drive roller 98 has a vibration imparting rotation mechanism 99. The vibration imparting rotation mechanism 99 causes the driving roller 98 to contact the guide roller 24 by a fixed contact pressure, and rotates at a predetermined number of revolutions to impart vibration in the vertical direction. The vibration is performed with an amplitude corresponding to the vibration of the belt in the actual machine. Moreover, the rotational speed of the drive roller is determined according to the acceleration rate of the acceleration test. By setting the contact pressure between the driving roller 98 and the guide roller 24 to be higher than the contact pressure between the belt and the guide roller in the actual machine, the acceleration rate can be increased. Further, the surface unevenness measuring device 76 is used to measure the surface unevenness of the guide roller 24 every day.

In the above table, the criterion for determining the fatigue time (year) obtained based on the accelerated fatigue test is as follows. For the horizontal grain appearance, it is judged that it is 1.0 years or more, and it is judged that it is not possible by less than 1.0 year. For the improper formation of the striated film, it is judged that it is ok for 2.5 years or more, and it is judged that it is not possible for less than 2.5 years. For the deterioration of the surface of the roll, it is judged that it is more than one year, and it is judged that it is not possible for one year or less. The positional controllability is not included in the current judgment criteria, and is described as a reference. This is because the object of the present invention is to prevent martensite formation of the belt and to determine whether or not the point is satisfied. Therefore, in the comprehensive judgment, when the horizontal stripes appear, the horizontal grain formation is improper, and the surface deterioration of the roll is all ok, the evaluation is performed in three stages of "excellent", "good", and "may" depending on the merits. Moreover, even if one is not possible, the comprehensive judgment is judged as not possible. In addition, in the case where the positional controllability is also included in the judgment criterion, and the deterioration of the surface is judged to be impossible, the first to fifth embodiments are comprehensive evaluations, and the sixth embodiment and the seventh embodiment are provided. Comparative Examples 1 to 3 were not acceptable in the overall evaluation.

23‧‧‧With

23a‧‧‧Upper side belt

24‧‧‧guide roller

24a‧‧‧Rotary axis

30‧‧‧Support

31‧‧‧Support frame

32‧‧‧ damper

Claims (10)

A solution film forming apparatus comprising: a belt made of austenitic stainless steel, which is mounted on a plurality of rollers and travels by rotation of each of the rollers; and a mold that ejects a dope containing a polymer and a solvent to a running film is formed on the belt in the walking; a peeling roller is peeled off, and the casting film on the belt is peeled off as a film; and a guide roller is disposed in parallel with each of the rollers, and the belt The inner surface is supported to support the belt from the inner side; the support is configured to rotatably support the guide roller; and a damper is provided to support the support to make the circumferential surface of the guide roller The belt is supported obliquely in a vertical plane in the width direction of the belt. The solution film forming apparatus according to claim 1, wherein the guide roller has a circumferential surface made of metal. The solution film forming apparatus according to claim 1, further comprising: a movable plate supporting the holder on both sides of the guide roller; and a swing support portion disposed at a center in a width direction of the belt The movable plate is slidably supported in a vertical plane in the width direction of the belt, and the damper is provided at a position where the swing of the movable plate is suppressed. The solution film forming apparatus according to claim 2, further comprising: a movable plate supporting the holder on both sides of the guide roller; and a swing support portion provided at a center in a width direction of the belt In the width of the strip The movable plate is oscillatably supported in a direction perpendicular to the plane, and the damper is provided at a position where the swing of the movable plate is suppressed. The solution film forming apparatus according to any one of claims 1 to 4, wherein the damper is an elastic body made of an elastic material. The solution film forming apparatus according to claim 1, wherein the damper is a telescopic cylinder damper. The solution film forming apparatus according to claim 1, wherein the damper is a pressure measuring element and is hydraulically controlled based on a pressure signal of the load cell. Damper. The solution film forming apparatus according to claim 6, wherein the guide roller is provided in plurality between the respective rollers, and the damper is disposed on both sides of the guide roller. The solution film forming apparatus according to claim 7, wherein the guide roller is provided in plurality between the respective rollers, and the damper is disposed on both sides of the guide roller. A solution film forming method, wherein a belt made of austenitic stainless steel is erected on a plurality of rollers and rotatably driven, and a dope containing a polymer and a solvent is ejected from a mold to a surface of the belt to form a cast film, and The strip is stripped of the cast film as a film, and the solution film forming method is characterized by: The plurality of guide rollers are used to support the belt, and the support roller is rotatably supported by the support roller, and the damper is provided by means of supporting the support. The circumferential surface of the guide roller is supported obliquely in a plane perpendicular to the width direction with respect to the belt.