KR101844807B1 - Casting apparatus and solution film-forming method - Google Patents

Abstract

The flexible device 15 of the solution film-forming equipment 10 includes a band 30 and a first upstream-side air supply and exhaust unit 41. The band 30 is an endless flexible support formed in an annular shape. The first upstream-side air supply and exhaust unit (41) has a supply portion (61) and a pair of air cut-off plates (62). The supply portion 61 has an air supply duct 66. The supply duct 66 has a plurality of nozzles 67 on the bottom surface opposed to the band 30. The air supply unit 61 ejects gas from the plurality of nozzles 67 in a direction perpendicular to the film surface of the flexible film 36. Each wind blocker 62 is disposed on the passage line at the side edge of the flexible film 36 or inside the width direction than the passage line.

Description

[0001] CASTING APPARATUS AND SOLUTION FILM-FORMING METHOD [0002]

The present invention relates to a flexible apparatus for forming a film used as a retardation film from a dope, and a solution casting method.

A phase difference film is used for a liquid crystal display, and the quality required for a phase difference film is becoming strict due to the large screen and high definition of a liquid crystal display. What is important as the required quality is optical characteristics, and the optical characteristics include Re, Rth, uniformity in the direction of the slow axis (orientation angle), and the like. Among them, the demand for the uniformity of the direction of the slow axis is very strict. More specifically, it is desirable to suppress the amount of shift of the slow axis in the width direction of the long film (hereinafter referred to as the shaft shift amount) within the range of -1.5 DEG to 1.5 DEG with respect to the direction of the target slow axis , It is required to suppress the axial deviation amount within the range of -1 DEG to 1 DEG, preferably within the range of -0.4 DEG to 0.4 DEG. Re is the optical anisotropy in the film plane, and Rth is the optical anisotropy in the film plane and the film thickness direction. Ny is the refractive index in the width direction of the film, nz is the refractive index in the thickness direction of the film, and d is the thickness of the film, Re and Rth are Respectively.

Re = (ny-nx) xd

Rth = ((ny + nx) / 2-nz) xd

As a method for producing a film used as a retardation film, a solution film-forming method is preferable from the viewpoint of optical properties as described above. The market for phase difference films has been expanding. As this market expands, it is necessary to improve the production efficiency of films in solution film formation.

The solution film-forming method is industrially carried out by a continuous method. That is, the fusing step from the time when the dope is softened to the time when the flexible film is peeled off as a flexible film, and the drying step for drying the film as the peeled flexible film are successively performed. Increasing the speed in the flexible process and the flexible process during the drying process leads to the improvement of manufacturing efficiency.

Therefore, in order to increase the drying speed of the flexible film, a wind was blown in the past as in Japanese Patent Laid-Open Publication No. 61-110520 or Japanese Patent Laid-Open Publication No. 64-055214. In Japanese Patent Application Laid-Open No. 61-110520, a drying air was flowed in parallel with the flexible film, and the drying air was flowed so as to be a counter current or a counter current with respect to the running direction of the flexible film. Further, in Japanese Patent Laid-Open Publication No. 64-055214, dry air is blown perpendicularly to the flexible film against a flexible film formed by a specific dope on a running support.

Further, in Japanese Patent Laid-Open Publication No. 64-055214, wind is blown to the coarse film for drying, and the angle formed by the wind direction and the surface of the support is set to 45 ° to 80 ° or 90 °. In Japanese Patent Application Laid-Open No. 2003-103544, the direction of wind blowing from the nozzles toward the flexible film is set to 45 ° to 90 °.

However, in the method of drying the flexible film by reaching the wind, the air to be blown as the wind is heated to warm the air to advance the drying effectively or efficiently. As described above, when the heated air is brought into contact with the flexible film, the exposed portion of the support, on which the flexible film is not formed, is gradually heated up. If the temperature of the exposed portion of the support is too high, the temperature of each side of the flexible film rises too much to foam.

Therefore, in order to prevent an increase in the temperature of the exposed portion of the side of the supporter by the air blown into the flexible film, a wind block is provided in Japanese Patent Laid-Open Publication No. 2005-047141 so that the wind does not touch the exposed portion of the supporter.

However, there is a problem in that a method of spraying wind in parallel with the flexible film has a problem that a minute wire extending in the flexible direction is generated in the flexible film, though the drying speed is faster than in the case of not blowing wind. Further, in Japanese Patent Application Laid-Open No. 2003-103544, when wind is blown vertically to the flexible film, the wind comes to the upstream side after touching the flexible film. It has been pointed out that the film thickness becomes uneven by this flow.

Here, in the method of Japanese Patent Application Laid-Open No. 2003-103544, the temperature of the gas to be injected is raised to further increase the drying speed. However, if the temperature of the substrate is increased as described above, the temperature of the support becomes nonuniform in the width direction during repeated flexing and peeling, and the optical characteristics of the film, particularly, the amount of axial displacement is large, The side portion may be warped. Once the support begins to bend, the bending gradually increases as the vehicle continues to travel, making it almost impossible to calibrate it while driving. In addition, in recent years, there is also a demand for widening of the film. The above problem is more remarkable in the widening of the support due to the widening of the film and the prolongation of the support for the new improvement of the production efficiency. Further, in the method of Japanese Patent Application Laid-Open No. 2005-047141, since the gas flows in parallel to the flexible film between one of the pair of wind blocking plates and the other, the temperature of the gas in the width direction of the flexible film becomes uneven. The temperature of the substrate becomes uneven in the width direction of the flexible film, which causes a problem that the axial misalignment becomes uneven particularly in the width direction among the optical characteristics of the film.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to improve the drying speed of the flexible film in order to improve the production efficiency of the film by the solution film formation, to make the film uniform in the width direction of the slow axis, And to provide a solution casting method.

In order to solve the above-mentioned problems, a flexible device of the present invention comprises a flexible support, a first supply portion, and a pair of first wind blocking members. The flexible support is annular. The flexible support has a flexible film on a flexible surface on which the dope is flexible. The flexible support continuously circulates in the longitudinal direction and circulates to return to the flexible position at the peeling position. The peeling position is a position where the cohesive film peels off. The flexible position is where the dope is flexible. The first supply portion exits the heated gas. The first supply portion exits the gas from the opening opposed to the flexible support. And the first supply unit expels the gas in a direction perpendicular to the film surface of the flexible film. The pair of first wind shield members extend along the running path of the flexible support. The first wind blocking member is disposed on the passage line of the side edge of the flexible film or on the inner side in the width direction of the flexible support than the passage line. The first wind block member suppresses the outflow of the gas from the vicinity of the film surface of the coherent film to the exposed portion of the side of the flexible support.

Preferably, the first supply portion has a supply duct and a plurality of nozzles. The air supply duct is disposed so that its bottom surface is opposed to the flexible support so as to cover the flexible film through which it passes. The nozzle is provided to protrude from the bottom surface of the air supply duct. The plurality of nozzles are arranged at intervals in the running direction of the flexible support. The opening is provided at the tip of the nozzle. The opening is in the form of a slit extending in the width direction of the flexible support. And the wind block member is installed at a position where the height from the flexible surface is lower than the air supply duct.

It is preferable that the flexible device further includes an exhaust part. The exhaust part sucks the atmosphere around the flexible film from a plurality of openings. And the exhaust portion is installed at a position higher than the wind blocking member. And the plurality of openings of the exhaust part are provided so as to oppose each other between the nozzle and the nozzle.

The flexible device preferably includes a second supply portion and a second wind blocking member. The second supply portion exits the heated gas. And the second supply portion is installed to face the first supply portion with the flexible support interposed therebetween. And the second supply portion emits the gas from an opening opposed to the flexible support. And the second supply portion emits the gas in a direction perpendicular to the flexible support. The second wind shield member extends along the running path of the flexible support. And the second wind blocking member is installed so as to face the first wind blocking member with the flexible support interposed therebetween. And the second wind block member suppresses the outflow of the gas from the second supply portion to the side portion of the non-lubricated surface corresponding to the exposed portion. The non-lubricated surface is a surface opposite to the flexible surface.

The flexible device may further include a third supply portion downstream of the first supply portion. And the first supply portion is installed in a first travel region in which the flexible support travels with the flexible surface facing upward. And the third supply portion has an opening toward the upstream side in the running direction of the flexible support. And the third supply portion sends a countercurrent gas parallel to the film surface of the coherent film through which the third coherent portion passes.

It is preferable that the third supply portion is provided in a second travel region in which the flexible support travels with the flexible surface facing downward.

The solution film-forming method of the present invention comprises a flexible film forming step (A step), a drying step after peeling (B step), a drying step before peeling (C step), and a suppressing step (D step). Step A forms a flexible film by softening the dope on an annular flexible support continuously running in the longitudinal direction. Step B removes the flexible film from the flexible support and dries it. The A step is performed again with respect to the flexible support after the flexible film is peeled off. Step C is to spray the gas in a direction perpendicular to the film surface of the coherent film to dry the coherent film. The D step is performed during the C step. The step D suppresses the outflow of the gas from the vicinity of the film surface of the flexible film to the exposed portion of the side of the flexible support by the pair of first wind shielding members. And the pair of first wind shield members are arranged on the passage line of the side edge of the flexible film or on the inner side in the width direction of the flexible support than the passage line. The first wind blocking member extends along the running path of the flexible support.

It is preferable that the gas is discharged from the opening of the first supply portion having a plurality of nozzles having an air supply duct and an opening formed at the tip thereof. The air supply duct is disposed so that its bottom surface is opposed to the flexible support so as to cover the flexible film through which it passes. And the nozzle is protruded from the bottom surface of the air supply duct. The plurality of nozzles are arranged at intervals in the running direction of the flexible support. The opening is in the form of a slit extending in the width direction of the support. And the wind shield member is installed at a position where the height from the flexible surface is lower than the air supply duct. The flexible surface is a surface on which the dope of the flexible support is flexible.

It is preferable to suck the atmosphere around the flexible membrane at a position higher than the first wind blocking member and opposed to the angle between the nozzle and the nozzle.

The solution film-forming method preferably further includes the following E step and F step. The E step raises the temperature of the flexible film by spraying the heated gas from the first supply part to the flexible film on which the gas is injected. The base body of the E step is injected in a direction perpendicular to the non-lubricated surface. And the non-lubricated surface is a surface opposite to the flexible surface of the flexible support. F step suppresses the outflow of the gas to the side of the non-lubricated surface corresponding to the exposed portion by the second wind shielding member. The second wind shield member extends along the running path of the flexible support. And the second wind blocking member is installed so as to face the first wind blocking member with the flexible support interposed therebetween.

The solution film-forming method preferably includes the following G step. The G step is performed after the C step. And the G step is to dry the flexible film by sending a countercurrent gas parallel to the film surface. The C step is performed on the flexible film on the flexible support running with the flexible surface facing upward.

It is preferable that the G step is performed on the flexible film on the flexible support running with the flexible surface facing downward.

According to the present invention, in order to increase the production efficiency of the film by the solution film formation, it is possible to improve the new drying speed of the flexible film and to make the direction of the slow axis in the width direction of the film uniform so as to reduce the shaft misalignment, have.

The above objects and advantages will be readily apparent to those skilled in the art from a reading of the detailed description of the preferred embodiments with reference to the accompanying drawings.
1 is a schematic view of a solution casting facility.
2 is a side schematic view of the first upstream-side air supply / exhaust unit.
3 is a schematic plan view of the first upstream-side air supply / exhaust unit.
4 is a cross-sectional view taken along the line IV-IV in Figs. 3 and 4. Fig.
5 is a side schematic view of the second upstream-side air supply and exhaust unit.

The first embodiment of the present invention is preferably performed by the solution film-forming equipment 10 shown in Fig. The solution film-forming equipment 10 includes a flexible device 15, a first tenter 17, a roller drying device 21, a second tenter 23, a slitter 26, a winding device 27, In order from the upstream side. The flexible device 15 forms a polymer film (hereinafter simply referred to as a "film") 12 from a dope 11 in which the polymer is dissolved in a solvent. The first tenter 17 advances drying of the film 12 while supporting each side of the film 12 with the clip 16 as the support means. The roller drying apparatus 21 dries the film 12 while supporting it with a plurality of rollers 20. The second tenter 23 supports each side of the film 12 with a clip 22 as a support means to impart tensile force to the film 12 in the width direction. The slitter 26 cuts off the support traces of the respective sides supported by the clip 16 of the first tenter 17 and the support means 22 of the second tenter 23. The winding device 27 winds the film 12 around the winding core to form a roll.

In the present specification, the solvent content (unit:%) is a value based on dry weight. Specifically, when the mass of the solvent is x and the mass of the film 12 is y, the solvent content (unit:%) is a percentage obtained by {x / (y-x)} x 100.

The flexible device 15 includes a band 30, which is an endless flexible support formed in an annular shape, and a first roller 31 and a second roller 32 that rotate in the circumferential direction. The band 30 is wound around the circumferential surfaces of the first roller 31 and the second roller 32. At least one of the first roller 31 and the second roller 32 may be a driving roller having driving means. As the drive roller rotates in the circumferential direction, the band 30 in contact with the circumferential surface is transported. By this conveyance, the band 30 circulates and travels continuously in the longitudinal direction.

Above the band 30, a flexible die 35 for discharging the dope 11 is provided. The dope 11 is smoothly fused on the band 30 to form the flexible film 36 by continuously discharging the dope 11 from the flexible die 35 to the band 30 being conveyed. The position at which the dope 11 starts to contact the band 30 is hereinafter referred to as the flexible position PC.

The first roller 31 and the second roller 32 each have a temperature controller (not shown) for controlling the circumferential surface temperature. The first roller 31 cools the circumferential surface temperature to a predetermined range. By cooling the first roller 31, the band 30 is cooled every one revolution. Thus, even if the continuous operation is continued by the first upstream-side air supply and exhaust unit 41, the first downstream-side air supply and exhaust unit 42, and the second downstream air supply and exhaust unit 43, which will be described later, The temperature rise of both side portions 30s (see Fig. The flexible die 35 is provided above the band 30 on the first roller 31 and the flexible position PC is on the first roller 31. [ The second roller 32 heats so that the circumferential surface temperature is in a predetermined range. By heating the second roller 32, the flexible film 36 is dried more effectively.

The peripheral surface temperature of the first roller 31 is preferably in the range of 3 占 폚 to 30 占 폚, more preferably in the range of 5 占 폚 to 25 占 폚, and in the range of 8 占 폚 to 20 占 폚 Is more preferable. The peripheral surface temperature of the second roller 32 is preferably in the range of 20 ° C to 50 ° C, more preferably 25 ° C to 45 ° C, and more preferably 30 ° C to 40 ° C Is more preferable.

The flexible die 35 is not limited to the mode in which the flexible die 35 is provided above the band 30 on the first roller 31. [ For example, it may be provided above the band 30 from the first roller 31 to the second roller 32. In this case, the roller 33 is disposed below the band 30, which is directed from the first roller 31 to the second roller 32, and is disposed above the band 30 supported by the roller 33 It is preferable to dispose the flexible die 35.

A depressurization chamber is provided upstream of the dope 11 from the flexible die 35 to the band 30, that is, so-called beads in the running direction of the band 30, but illustration thereof is omitted. This decompression chamber sucks the atmosphere of the area on the upstream side of the dope 11 discharged from the flexible die 35 to decompress the area.

After the flexible film 36 is made hard enough to be transported to the first tenter 17, the flexible film 36 is peeled off from the band 30 with the solvent. It is more preferable that the peeling be performed in a range of 20 mass% or more and 50 mass% or less, and more preferably in a range of 25 mass% or more and 45 mass% or less. It is possible to make the direction of the slow axis more uniform as compared with the case of peeling at a solvent content higher than 50 mass% by peeling after reaching a low solvent content rate such as 50 mass%. In the case of peeling at 20% by mass or more, the production efficiency can be improved more certainly than in the case of peeling at less than 20% by mass.

At the time of peeling, the film 12 is supported by a peeling roller (hereinafter, referred to as peeling roller) 37 to keep the peeling position PP at which the flexible film 36 is peeled from the band 30 at a constant level. The peeling roller 37 may be a driving roller provided with driving means and rotating in the circumferential direction. Further, the peeling is carried out in the band 30 on the first roller 31. When the band 30 is circulated and returned from the peeling position PP to the flexible position PC, the new dope 11 is again softened.

The first running region in which the flexible surface of the band 30 on which the dope 11 is flexible travels upward in the running path of the band 30 includes the upstream portion of the flexible film forming region. The flexible film forming region is a region from the flexible position PC to the peeling position PP. The second traveling region in which the band 30 travels with its flexible surface facing downward in the traveling path of the band 30 includes the downstream portion of the flexible film formation region.

A first upstream-side air supply and exhaust unit (41) is provided downstream of the flexible position (PC) in the first running region of the band (30). In the downstream of the first upstream-side air supply and exhaust unit 41, there are provided a first downstream-side air supply and exhaust unit 42 and a second downstream-side air supply and exhaust unit 43. Thus, the first upstream-side air supply and exhaust unit 41, the first downstream-side air supply and exhaust unit 42, and the second downstream air supply and air discharge unit 43 are arranged in order from the upstream side along the traveling path of the band 30 Is installed. The number of the downstream-side air supply / exhaust units is not limited to two, but may be one or three or more. The first upstream-side air supply and exhaust unit 41 will be described later with reference to another drawing.

The first downstream side air supply and exhaust unit 42 includes an air supply unit 46 for discharging the dried gas, an exhaust unit 47 for sucking and exhausting the gas, and a controller 48. The controller 48 sends the gas to the supply unit 46 and independently adjusts the temperature and humidity of the gas, the flow rate from the supply unit 46, and the suction force at the exhaust unit 47. The second downstream side air supply and exhaust unit 43 also includes a supply unit 49, an exhaust unit 50, and a controller 51 like the first downstream air supply and exhaust unit.

The supply portions 46 and 49 are disposed upstream of the peeling position PP in the second running region of the band 30. [ The exhaust unit 47 is disposed upstream of the air supply unit 46 and the exhaust unit 50 is disposed upstream of the air supply unit 49. The respective suction ports 47a and 50a of the exhaust ports 46a and 49a of the supply units 46 and 49 and the exhaust units 47 and 50 that suction the gas are both disposed in the width direction of the band 30 As shown in Fig. The supply portions 46 and 49 are arranged such that the outflow ports 46a and 49a are directed to the upstream side in the traveling direction of the band 30. [ The exhaust portions 47, 50 are arranged so that the suction ports 47a, 50a are opposed to the band 30.

As described above, by arranging the supply units 46 and 49 and the exhaust units 47 and 50, the gas from the supply units 46 and 49 is conveyed in the counterflow direction parallel to the film surface of the flexible film 36, Lt; / RTI > By making it countercurrent, it is possible to dry the flexible film 36 more efficiently than the draft wind.

The band 30 directed from the second roller 32 to the peeling position PP can not be supported from below by the supporting means because the flexible film 36 is formed on the downwardly facing band surface. Therefore, the band 30, which is directed from the second roller 32 to the peeling position PP, takes a downwardly convex running route by its own weight. In terms of drying efficiency, the case of spraying the gas in the direction perpendicular to the flexible film 36 is superior to the case of the parallel flow. However, in order to inject the gas in the vertical direction at a flow rate sufficient to raise the drying efficiency higher than the parallel flow, it is necessary to provide a large amount of air supply means below the flexible film 36. The more the supply means is arranged, the higher the possibility that the supply means and the band 30 come into contact with each other. Therefore, by disposing the supply units 46 and 49 below the band 30 facing the peeling position PP from the second roller 32, The flexible film 36 is dried with a parallel countercurrent gas.

However, the number of the downstream-side air supply / exhaust units for flowing a countercurrent gas parallel to the film surface of the flexible film 36 is not limited to two as in the present embodiment, and may be one or three or more.

The first downstream side air supply and exhaust unit 42 and the second downstream air supply and air supply unit 43 are independently controlled by the controller 48 and the controller 51 in the present embodiment, Or may be controlled independently.

The gas from the supply units 46 and 49 is heated by the controllers 48 and 51. By flowing the hot air thus heated onto the flexible film 36, the flexible film 36 is heated to advance the drying.

A blowing device (not shown) may be disposed on the conveying path between the flexible device 15 and the first tenter 17. And the drying of the film 12 is advanced by blowing air from the blowing device.

The flexible film 36 is peeled off by the peeling roller 37. The peeled flexible film 36, that is, the film 12 is guided to the first tenter 17.

The first tenter 17 supports the film 12 with the clip 16 and conveys the film 12 in the width direction while conveying the film 12 in the longitudinal direction to widen the width of the film 12. A preheating area, a stretched area, and a relaxed area are formed in the first tenter 17 in this order from the upstream side. Also, a relaxation area may be omitted.

The first tenter 17 has a pair of rails (not shown) and a chain (not shown). The rails are provided on both sides of the conveying path of the film 12, and the pair of rails are disposed apart from each other at a predetermined interval. The rail spacing is constant in the preheating area, gradually widening toward the downstream in the stretched area, and constant in the relaxation area. Further, the rail spacing of the relaxation area may be gradually narrowed toward the downstream.

The chain is mounted movably along the rail spanning the original sprocket and the driven sprocket (not shown). The plurality of clips 16 are attached to the chain at predetermined intervals. The rotation of the priming sprocket causes the clip 16 to circulate along the rail.

The clip 16 starts to support the film 12 guided in the vicinity of the entrance of the first tenter 17 and moves toward the exit to release the support in the vicinity of the exit. The released clip 16 again moves in the vicinity of the inlet to support the newly guided film 12.

The preheating area, the stretching area, and the relaxation area are formed as spaces by the discharge of the drying wind from the duct 54, and there is no clear boundary. The duct 54 is provided above the conveying path of the film 12. The duct 54 has a slit for sending dry wind, and is supplied from a blower (not shown). The blower sends dry wind adjusted to a predetermined temperature or humidity to the duct 54. The duct 54 is arranged such that the slit is opposed to the conveying path of the film 12. Each of the slits is elongated in the width direction of the film 12 and is formed at a predetermined interval in the transport direction. A duct having the same structure may be provided below the conveying path of the film 12 or may be provided both above and below the conveying path of the film 12. [

In the first tenter 17, the film is conveyed while being dried by the drying wind from the duct 54, and the width can be changed by the clip 16 at a predetermined timing.

The content of the solvent in the film 12 in the stretched area is preferably 7 mass% or more and 30 mass% or less. The stretching ratio ER1 (= {(width after stretching) / (width before stretching)) x 100) in the stretching treatment is preferably greater than 5% and not greater than 30%. The temperature of the film 12 in the stretching treatment is preferably 80 ° C or more and 160 ° C or less.

The atmosphere inside the roller drying apparatus 21 is controlled by an air conditioner (not shown) such as temperature and humidity. In the roller drying apparatus 21, the film 12 is wound around a plurality of rollers 20 and transported. Also in the roller drying apparatus 21, the solvent is evaporated from the film 12. In the roller dryer 21, it is preferable that the drying step is performed until the content of the solvent becomes 5 mass% or less.

When the film 12 from the roller drying device 21 is curled, a curl correcting device (not shown) may be provided between the roller drying device 21 and the second tenter 23. The curl correcting device calibrates the curl to flatten the film (12).

The second tenter 23 stretches the film 12 in the width direction. This stretching results in a film 12 having desired optical characteristics. The obtained film 12 is used, for example, as a retardation film. The second tenter (23) has the same structure as the first tenter (33). Also, the duct 55 installed in the second tenter 23 flows out from the slit (not shown) toward the film 12 by discharging the dry air heated to a predetermined temperature.

The stretching ratio ER2 (= {(width after stretching) / (width before stretching)) x 100) in stretching in the second tenter 23 is preferably more than 10% and not more than 40%. The content of the solvent in the film 12 at the start of the stretching is preferably 3 mass% or less. The temperature of the film 12 in stretching is preferably 130 ° C or higher and 200 ° C or lower.

The second tenter 23 may not be used depending on the optical characteristics of the film 12 to be manufactured. For example, when the desired characteristics are exhibited by stretching by the first tenter 17, the second tenter 23 may not be used.

The slitter 26 downstream of the second tenter 23 is provided with a support trace by the clips 16 and 22 of the first tenter 17 and the second tenter 23 when the film 12 is guided. Remove the side. The film 12 with the sides removed is sent to the winding device 27 and wound in a roll shape. A slitter may also be provided between the flexible device 15 and the first tenter 17 or between the first tenter 17 and the roller drying device 21. [

The first upstream-side air supply and exhaust unit 41 will be described with reference to Figs. 2 to 4. Fig. 3 and 4, the illustration of the first roller 31 is omitted for the sake of simplification of the drawings.

The first upstream-side air supply and exhaust unit 41 is provided downstream of the flexible position PC and includes a supply portion 61, a wind cut-off plate 62 as a wind cut-off member, a discharge portion 63 . The supply portion 61 injects gas in a direction perpendicular to the film surface of the flexible film 36 formed on the band 30. [ 3, the length of the slit-like dope outlet 35a formed in the flexible die 35 is made smaller than the width of the band 30. As shown in Fig. The flexible film 36 is formed on the central portion 30c in the width direction of the band 30 so that the side portions 30s of the band 30 are exposed. The wind blocking plate 62 suppresses the outflow of gas from the vicinity of the film surface of the flexible film 36 to the exposed portion of the side of the band 30. [ The exhaust part (63) sucks the atmosphere around the flexible film (36). Each of the supply portion 61, the air shutoff plate 62, and the exhaust portion 63 will be described in detail below.

The air supply unit 61 has an air supply duct 66, a plurality of nozzles 67 provided in the air supply duct 66, a blower 68 and a blowing controller 69. The blower (68) feeds the gas to the air supply duct (66). The airflow controller 69 controls the temperature, humidity, and flow rate of the gas sent from the air blower 68 to the air supply duct 66. By this control, the flow rate and the flow rate of the gas from the nozzle 67 are adjusted. The gas is heated by the blowing controller 69. And the heated gas is sprayed onto the flexible film 36 as warm air to advance the drying of the flexible film 36. [

The air supply duct 66 is a box-like duct whose bottom surface 66a faces the band 30 so as to cover the flexible film 36 passing therethrough. A plurality of nozzles (67) are arranged so as to be spaced apart in the running direction of the band (30). Each of the nozzles 67 has a shape elongated in the width direction of the band 30 and is installed to protrude from the bottom surface 66a of the air supply duct 66 toward the band 30. [ An opening 67a for discharging the gas in the air supply duct 66 to the outside is formed at the front end opposed to the band 30. The opening 67a has a long slit shape in the width direction of the band 30.

The gas is sent in the direction perpendicular to the film surface of the flexible film 36 by sending the gas from the opening 67a opposed to the band 30. [ By spraying the gas in the vertical direction, the flexible film 36 can be dried more efficiently than when it is sprayed in parallel to the film surface. Therefore, the production efficiency of the film 12 is improved. In order to send the gas in the vertical direction, it is not necessary to blow the air from the nozzle 67. For example, an opening (not shown) may be formed in the bottom surface 66a of the air supply duct 66, do.

Further, by spraying the gas in the vertical direction on the film surface, the drying efficiency is enhanced. This makes it possible to lower the content of the solvent in the flexible film 36 at the time of peeling, that is, at the peeling position PP, and to lower the content of the solvent in the flexible film 36 to 50 mass% or less. As the solvent content of the flexible film 36 in the peeling position PP is lowered, the direction of the slow axis in the width direction of the film 12 can be made uniform. Concretely, the angle formed with the intended direction of the slow axis can be suppressed to a range of -1 DEG to 1 DEG, and also to a range of -0.4 DEG to 0.4 DEG. The solvent content of the flexible film 36 in the peeling position PP is preferably in the range of 20 mass% to 50 mass%. By advancing the drying so that the solvent content of the flexible film 36 in the peeling position PP is 50 mass% or less, it is possible to more reliably suppress the axial shift amount in the range of -1 DEG to 1 DEG have.

The shape of the opening 67a is preferably a slit shape, but it may not necessarily be a slit shape. For example, a plurality of circular or rectangular openings (not shown) may be formed in the width direction of the band 30 at the tip of the nozzle 67.

3 and 4, the length of the opening 67a is shown to be shorter than the distance between the pair of wind blocking plates 62 provided on both sides. However, by forming the opening 67a of the nozzle 67 longer than the distance of the pair of wind blocking plates 62 and closing the outside of the wind blocking plate 62, the distance (distance) of the pair of wind blocking plates 62 It may be used shorter.

In the present embodiment, a plurality of air supply ducts 66 are arranged along a traveling path of the band 30. However, instead of this sun, a plurality of nozzles may be provided in the air supply duct by using one air supply duct extending in the running direction of the band 30 so as to reach the second roller 32. [ Although six nozzles 67 are provided in the individual supply ducts 66 in the present embodiment, the number of nozzles 67 is not particularly limited.

It is preferable that the temperature of the gas from the air supply duct 66 is in a range of (Tv-20 DEG C) to (Tv + 100 DEG C) or less when the boiling point of the solvent of the dope 11 is Tv. (Tv-20 占 폚) or more, the drying efficiency of the flexible film 36 becomes higher. Further, by setting it to (Tv + 100 DEG C) or less, foaming of the flexible film 36 can be more surely prevented. When the solvent of the dope 11 is composed of a plurality of components, the lowest boiling point of the solvent component is defined as Tv.

It is preferable that the speed of jetting the gas from the nozzle 67, that is, the flow velocity is in the range of 5 m / sec to 25 m / sec. By setting the flow velocity to 5 m / sec or more, the drying efficiency of the flexible film 36 becomes higher. In addition, by setting the flow velocity to 25 m / sec or less, foaming of the flexible film 36 can be more reliably prevented or a smooth film 12 on the surface can be obtained more reliably.

The wind block (62) extends along the runway of the band (30). The wind blocking plate 62 is disposed on the passage line of the side edge of the flexible film 36 or in an orientation standing inward in the width direction of the band 30 than the passage line. This prevents the heated gas from the air supply duct 66 from flowing out from the vicinity of the film surface of the flexible film 36 to the exposed portion of the side portion 30s of the band 30. It is possible to suppress the temperature rise of the side portion 30s by suppressing the outflow of the heating body to the side portion 30s. Therefore, it is possible to obtain a uniform film 12 uniform in the direction of the slow axis in the width direction and in the whole film, and to prevent the warp caused by the temperature rise of the band 30. [ 3 and 4 show the case where the wind blocking plate 62 is disposed inside the width direction of the band 30 rather than the passing line of the side edge of the flexible film 36. [

The wind shielding member may be of a block shape such that the area extending from the side edge 36e of the flexible membrane 36 to the side portion 30s of the band 30 is covered with the bottom surface in place of the wind shield plate 62. [

The wind blocking plate 62 is provided lower than the air supply duct 66 with the flexible surface 30a of the band 30 as a reference of height. That is, the height of the edge portion of the wind blocking plate 62 farthest from the band 30 is lower than the height of the bottom surface of the air supply duct 66. 2, the nozzle 67 disposed on the bottom surface 66a of the air supply duct 66 is not covered by the air shutoff plate 62 when viewed from the side of the band 30, (62) and the air supply duct (66). The space between the nozzle 67 and each of the nozzles 67 is communicated to the space above or to the side of the wind blocking plate 62 through the space between the wind blocking plate 62 and the air supply duct 66. Therefore, the space in the vicinity of the film surface of the flexible film 36 is spatially connected to the space above or to the side of the air blast plate 62, whereby the gas from the air supply duct 66 is supplied to the flexible film 36, (62), it is guided above or to the side of the wind blocking plate (62).

The spaces sandwiched by the pair of wind blocking plates 62 disposed in the vicinity of the side edges 36e of the flexible film 36 are separated from each other by the air supply from the air supply duct 66 The pressure is high. Further, as described above, the space near the film surface of the flexible film 36 and the space above or at the side of the wind blocking plate 62 are spatially connected. As a result, the atmosphere around the flexible film 36 is promptly replaced with the gas flowing out from the air supply duct 66, so that the drying of the flexible film 36 proceeds more efficiently.

It is preferable that the wind blocking plate 62 is disposed so that the distance D1 from the band 30 is in a range of 10 mm or more and 50 mm or less and more preferably 10 mm or more and 40 mm or less. By setting D1 to 10 mm or more, it is possible to more reliably prevent contact between the wind blocking plate 62 and the band 30. [ The flow of gas from the vicinity of the film surface of the flexible film 36 to the side portion 30s of the band 30 can be more reliably suppressed as compared with the case of larger than 50 mm.

It is preferable that the wind blocking plate 62 is disposed on the passing line of the side edge 36e of the flexible film 36 or on the upper side between the line 50 mm inside the passing line and the passing line. That is, the distance D2 between the outer surface of the wind blocking plate 62 and the passing line of the side edge 36e of the flexible film 36 is preferably in the range of 0 mm to 50 mm. The outflow of the gas from the vicinity of the film surface of the flexible film 36 to the side portion 30s of the band 30 can be suppressed more reliably by setting the passage line (D2 = 0 mm) or the inside (D2> 0 mm). When D2 is larger than 50 mm, the optical characteristics of the film 12, particularly the width of the side portion in which the direction of the slow axis is different from the target direction, becomes larger than in the case of 50 mm or less, It may be necessary to increase the size.

The exhaust portion 63 has a suction duct 72, an aspirator 73, and an exhaust controller 74. The aspirator 73 sucks the gas. The exhaust controller 74 controls the suction force of the aspirator 73. By this control, the suction force of the gas from the opening 72a formed in the suction duct 72 is adjusted. The gas is cleaned by the exhaust controller 74 and exhausted. The cleaned exhaust may be used for supplying air from the air supply duct 66 to the blower 68.

The plurality of suction ducts (72) are installed at positions higher than the wind blocking plate (62). Each opening 72a of each suction nozzle is opposed between the nozzle 67 and the nozzle 67. As described above, the opening 67a is disposed between the space near the film surface of the flexible film 36 spatially connected and the upper space or the outer space on the side of the wind blocking plate 62. Therefore, the atmosphere around the flexible film 36 is guided to the upper side of the wind blocking plate 62 more quickly. As a result, the atmosphere around the flexible film 36 is transferred more quickly to the fresh air from the air supply duct 66, and the drying of the flexible film 36 proceeds more efficiently. Since the suction duct 72 is installed at a position higher than the wind blocking plate 62, the outflow of the gas from the vicinity of the film surface of the flexible film 36 to the exposed portion of the side portion 30s of the band 30 is more reliably suppressed . Therefore, the temperature rise of the side portion 30s can be more reliably prevented, and the uniformity of the film 12 in the direction of the slow axis in the width direction can be more reliably achieved.

The suction duct 72 may be disposed so as to be positioned higher than the wind blocking plate 62 in the normal direction of the surface of the band 30. [ For example, as in the present embodiment, the suction duct 72 may be disposed such that the lower end of the opening 72a is lower than the bottom surface 66a of the air supply duct 66, The lower end of the opening 72a may be the same height as the bottom surface 66a of the duct 66 and may be higher than the bottom surface 66a of the air supply duct 66. [ The suction duct 72 may be arranged so that the opening 72a is located between the nozzle 67 and the nozzle 67 in the running direction of the band 30. [

The first upstream upstream air supply and exhaust unit 41 preferably further includes an air supply unit 77 upstream of the air supply unit 61, that is, between the flexible position PC and the air supply unit 61. The supply unit 77 has a nozzle 78, a blower 79, and a blower controller 80. The blower 79 sends gas to the nozzle 78. The airflow controller 80 controls the temperature, humidity, and flow rate of the gas sent out from the blower 79 to the nozzle 78. With this control, the flow rate and the flow rate of the gas from the nozzle 78 are adjusted. The gas is heated by the air blowing controller 80, and the heated gas is jetted onto the flexible film 36 as warm air to advance the drying of the flexible film 36.

The nozzle 78 is arranged such that the opening 78a is directed to the downstream side in the traveling direction of the band 30. [ As a result, the gas from the opening 78a flows on the flexible film 36 as a draft wind to the flexible film 36 passing through. The influence of the airflow of the bidet is suppressed by becoming a draft wind. However, the direction of the opening 78a may be slightly inclined toward the flexible film 36, and it is not necessary that the flow is parallel to the film surface of the flexible film 36 when the flow of the gas becomes a direct wind to the flexible film 36. [

The gas from the nozzle 78 flows between the bottom surface 66a of the air supply duct 66 and the flexible film 36 and most of the air is sucked to one of the most upstream side of the suction duct 72. [ As described above, by providing the supply portion 77 and drying the flexible film 36 immediately after the formation, the drying efficiency of the flexible film 36 is further improved, and the production efficiency of the film 12 is further increased.

As described above, in the present invention, the first flexible film drying step and the second flexible film drying step are performed until the flexible film 36 is peeled off from the band 30. The first flexible film drying step is a step of blowing a gas in a direction perpendicular to the flexible film by the first upstream-side air supply and exhaust unit 41 to dry the flexible film. The second flexible film drying process is a process in which a countercurrent gas parallel to the film surface is sent to the flexible film 36 after the first flexible film drying process by the first and second downstream air supply and exhaust units 42 and 43 And the drying of the flexible film 36 is advanced.

The temperature of the central portion 30c of the band 30 in which the flexible film 36 is formed is hard to rise due to the latent heat of evaporation of the solvent from the flexible film 36. [ Therefore, in order to further increase the drying efficiency of the flexible film 36, the following second embodiment is preferable.

In the second embodiment of the present invention, the second upstream-side air supply and exhaust unit 90 is further provided in the flexible device 15. The second upstream-side air supply and exhaust unit 90 is disposed downstream of the flexible position PC and disposed opposite to the first upstream air supply and exhaust unit 41 with the band 30 interposed therebetween.

The second upstream-side air supply and exhaust unit 90 includes the air supply unit 91, the air shutoff plate 92 as the air shutoff member, and the exhaust unit (Not shown). The respective components of the air supply unit 91 and the air shutoff plate 92 as the air shutoff member and the exhaust unit are the same as those of the air supply unit 61 and the air shutoff plate 62 of the first upstream air supply and exhaust unit 41, And therefore only points different from these will be described below.

The supply unit 91 injects the gas in a direction perpendicular to the non-lubricated surface 30b on the opposite side of the flexible surface 30a of the band 30. [ The wind block 92 is installed in a standing position in which it faces the wind block plate 62 with the band 30 interposed therebetween. This wind blocking plate 92 suppresses the gas from the nozzle 93 of the air supply unit 91 from flowing out to the non-lubricating surface 30b of the side portion 30s. The non-lubricated surface 30b of the side portion 30s corresponds to the flexible surface 30a of the side portion 30s and corresponds to the opposite side of the flexible surface 30a of the side portion 30s.

The distance D3 from the non-lubricating surface 30b to the wind blocking plate 92 is arranged to be in a range of 10 mm or more and 50 mm or less in the same manner as the distance D1 between the wind blocking plate 62 and the flexible surface 30a And more preferably 10 mm or more and 40 mm or less.

The plurality of nozzles 93 are provided on the opposed surface opposed to the non-lubricating surface 30b of the air supply duct 96. The suction duct 97 of the exhaust part is provided so that the opening is opposed between the nozzle 93 and the nozzle 93 in the running direction of the band 30. [ The suction duct 97 may be disposed such that the opening is located at a position lower than the wind blocking plate 92 in the normal direction of the non-lubricating surface 30b of the band. The exhaust portion sucks the atmosphere around the flexible film 36 from the opening of the suction duct 97.

As described above, by using the second upstream-side air supply / exhaust unit 90, the central portion 30c of the band 30 in which the flexible film 36 is formed can be more reliably warmed. Therefore, the drying efficiency of the flexible film is further improved as compared with the first embodiment, and the production efficiency of the film 12 is enhanced. Further, as the drying efficiency of the flexible film 36 is increased, the content of the solvent in the peeling position PP is further lowered, and the amount of off-axis shift of the slow axis more surely falls within the range of -1 DEG to 1 DEG, 0.4 DEG or less. Also in this embodiment, since the heating from the non-lubricated surface of the side portion 30s is suppressed by the wind blocking plate 92, warping of the band 30 is prevented.

The wider the width of the band 30, the more effective the present invention is, and the wider the width of the film to be produced, the more effective it is.

The present invention is particularly preferable in the case of producing a film used as a retardation film of a liquid crystal display or the like.

The cellulose acylate is not particularly limited. The acyl group of the cellulose acylate may be only one type or may have two or more types of acyl groups. When two or more acyl groups are present, one of them is preferably an acetyl group. It is preferable that the ratio of the esterification of the hydroxyl group of the cellulose with the carboxylic acid, that is, the degree of substitution of the acyl group satisfies all of the following formulas (I) to (III). In the following formulas (I) to (III), A and B represent substitution degree of an acyl group, A represents substitution degree of an acetyl group, and B represents substitution degree of an acyl group having 3 to 22 carbon atoms.

(I) 2.0? A + B? 3.0

(II) 1.0? A? 3.0

(III) 0? B? 2.0

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. 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. Among them, the present invention is particularly effective when cellulose diacetate (DAC) is used as the cellulose acylate.

Hereinafter, examples of the present invention and comparative examples of the present invention will be described. The details are described in Example 1, and in the other Examples and Comparative Examples, only the conditions different from Example 1 are described.

≪ Example 1 >

5 was added to the solution film-forming equipment shown in Fig. 1 to prepare a film 12 for use as a phase difference film from the dope 11. The thickness of the objective film 12 is 58 占 퐉.

The circumferential surface temperature of the first roller 31 was set at 15 占 폚, and the circumferential surface temperature of the second roller 32 was set at 40 占 폚.

The distance D1 between the wind blocking plate 62 and the flexible surface 30a of the band 30 is 10 mm. The distance between the band 30 and the opening 67a of the nozzle 67 was set at 150 mm. The distance D2 between the outer surface of the wind blocking plate 62 and the side edge of the flexible film 36 is 0 mm. The temperature of the gas discharged from the nozzle 67 was set at 135 占 폚, and the wind speed was set at 25 m / sec.

In the first tenter 17, the film 12 containing the solvent was stretched in the width direction at a widening ratio of 8%. And the film 12 having a solvent content of less than 5 mass% was guided to the second tenter 23. [ In the second tenter 23, the film 12 was stretched so as to have a widening ratio of 21% in the width direction.

In Example 1, no foaming was observed in the flexible film 36. Further, no warpage or deformation of the side portion 30s was observed in the band 30. Fig. The solvent content in the peeling position (PP) was 33 mass%. The amount of axial displacement of the slow axis of the obtained film 12 is suppressed in the range of -0.05 DEG to 0.05 DEG in the width direction of the film 12 and in the range of -1 DEG to 1 DEG Lt; / RTI >

≪ Example 2 >

The distance D1 between the wind blocking plate 62 and the flexible surface 30a of the band 30 is 40 mm. The other conditions are the same as those in the first embodiment.

In Example 2, no foaming was observed in the flexible film 36. [ Further, no warpage or deformation of the side portion 30s was observed in the band 30. Fig. The solvent content in the peeling position (PP) was 33 mass%. The amount of axial displacement of the slow axis of the obtained film 12 is suppressed in the range of -0.05 DEG to 0.05 DEG in the width direction of the film 12 and in the range of -1 DEG to 1 DEG Lt; / RTI >

≪ Example 3 >

The distance D2 between the outer surface of the wind blocking plate 62 and the side edge 36e of the flexible film 36 is 50 mm. The other conditions are the same as those in the first embodiment.

In Example 3, no foaming was observed in the flexible film 36. Further, no warpage or deformation of the side portion 30s was observed in the band 30. Fig. The solvent content in the peeling position (PP) was 33 mass%. The amount of axial displacement of the slow axis of the obtained film 12 is suppressed in the range of -0.05 DEG to 0.05 DEG in the width direction of the film 12 and in the range of -1 DEG to 1 DEG Lt; / RTI >

≪ Comparative Example 1 &

The wind blocking plate 62 and the wind blocking plate 92 are not provided. The other conditions are the same as those in the first embodiment.

In this comparative example 1, the side portion 30s of the band 30 was bent while the repeated flexing and peeling was performed, so that the side portion 30s did not contact the first roller 31. [ As a result, the temperature of the side portion of the flexible film 36 became equal to or higher than the boiling point of the solvent, and the side portion was expanded. For this reason, the objective film 12 could not be produced.

≪ Comparative Example 2 &

The blower 68 is not operated, and the gas is prevented from coming out of the nozzle 67. Further, the suction duct 73 was not operated and the atmosphere was not sucked into the suction duct 72. The gas was supplied from the nozzle 78 to the coin-shaped film so as to form a curled wind concurrently. The temperature of the gas supplied from the nozzle 78 was 135 占 폚 and the wind speed was 25 m / sec. The supplied gas flows between the pair of wind blocking plates 62 and is sucked from the suction port 47a of the exhaust portion 47. The other conditions are the same as those in the first embodiment.

In this Comparative Example 2, since the gas supplied flows between one side of the pair of wind blocking plates 62 and the other side, foaming was not confirmed in the cohesive film, but the solvent content in the peeling position PP was 60 mass% The drying efficiency was bad. Further, the temperature in the width direction of the gas flowing between the pair of wind blocking plates 62 is increased from the center toward the side because heat is radiated from the inside to the outside of the wind blocking plate 62, The amount of shift was increased from -0.5 DEG to 0.5 DEG in the width direction of the film. But also in a range of -2 DEG to 2 DEG in the entire film.

≪ Comparative Example 3 &

The angle of the nozzle 67 was inclined at 45 degrees with respect to the flexible film, and the gas fed from the nozzle 67 was jetted to the flexible film at an angle of 45 degrees. A part of the gas after spraying was flowed in parallel with the flexible film so as to form a curled wind. The other conditions are the same as those in the first embodiment.

In this Comparative Example 3, since the gas supplied flows between one of the pair of wind blocking plates 67 and the other, foaming was not confirmed in the cohesive film, but the solvent content in the peeling position PP was 50 mass% The drying efficiency was bad. Since the temperature in the width direction of the gas flowing between the pair of wind blocking plates increases from the center toward the side portion due to heat radiation from the inside to the outside of the wind blocking plate 67, Of -0.2 DEG to 0.2 DEG in the width direction of the substrate. But also in the entire range of the film from -1.6 DEG to 1.6 DEG.

Claims (12)

Annular flexible supports;
A first supply portion for discharging the heated gas;
A pair of first wind blocking members extending along the running path of the flexible support; And
And an exhaust part for sucking gas around the flexible film from the plurality of openings,
Wherein the flexible support is circulated so as to return from a peeling position where the flexible film is formed on the flexible surface on which the dope is flexible and continuously runs in the longitudinal direction to peel off the flexible film,
Wherein the first supply portion sends out the gas from an opening opposed to the flexible support and sends out the gas in a direction perpendicular to the film surface of the flexible film,
The first wind blocking member is disposed on the passage line of the side edge of the flexible film or on the inner side in the width direction of the flexible support body than the passage line and extends from the vicinity of the film surface of the flexible membrane to the exposed portion of the side of the flexible support body Thereby preventing the outflow of the gas,
Wherein the first supply portion has an air supply duct and a plurality of nozzles and the bottom surface is disposed to face the flexible support so as to cover the flexible film through which the air supply duct passes and the nozzles protrude from the bottom surface of the air supply duct Wherein the plurality of nozzles are arranged at intervals in the running direction of the flexible support, the openings are provided at the tips of the nozzles, the openings are slit-shaped extending in the width direction of the flexible support, 1 wind blocking member is installed at a position where the height from the flexible surface is lower than that of the air supply duct,
Wherein the exhaust part is provided at a position higher than the first wind shield member and the plurality of openings are provided at positions corresponding to positions between the nozzles and the nozzles. delete delete The method according to claim 1,
A second supply portion for discharging the heated gas; And
And a second wind blocking member extending along the running path of said flexible support, said flexible device comprising:
The second supply portion is provided so as to face the first supply portion with the flexible support interposed therebetween, and the gas is discharged from the opening opposed to the flexible support, the gas is discharged in a direction perpendicular to the flexible support,
The second wind shielding member is provided so as to face the first wind shielding member with the flexible support interposed therebetween, and the outflow of the gas from the second air supply portion to the side portion corresponding to the exposed portion of the non- In addition,
And the non-lubricated surface is a surface opposite to the flexible surface. The method according to claim 1,
And a third supply unit disposed downstream of the first supply unit,
Wherein the first supply portion is installed in a first travel region in which the flexible support travels with the flexible surface facing upward,
Wherein the third supply portion has an opening toward the upstream side in the running direction of the flexible support and sends a gas which is in parallel with the film surface of the passing flexible film passing therethrough from the opening. 6. The method of claim 5,
Wherein the third supply portion is provided in a second travel region in which the flexible support travels with the flexible surface facing downward. (A) forming a flexible film by softening the dope on an annular flexible support continuously running in the longitudinal direction;
(B) drying the flexible film by peeling the flexible film from the flexible support;
(C) drying the flexible film by spraying a gas in a direction perpendicular to the film surface of the flexible film through a nozzle;
(D) a step of suppressing the outflow of the gas from the vicinity of the film surface of the flexible film to the exposed portion of the side of the flexible support, which is performed during the C step, by the pair of first wind shielding members, the solution casting method comprising:
The step A is performed again for the flexible support after the flexible film is peeled off,
Wherein the pair of first wind shield members is disposed on the passage line of the side edge of the flexible film or on the inner side in the width direction of the flexible support than the passage line, Lt; / RTI >
Wherein the gas around the flexible membrane is sucked at a position higher than the first wind blocking member and corresponding to a position between the nozzle and the nozzle. 8. The method of claim 7,
And the air supply duct is arranged so as to face the flexible support so as to cover the flexible film passing through the air supply duct, and the air supply duct is disposed so as to face the flexible support so as to cover the flexible film passing through the air supply duct, Wherein the nozzle is arranged to protrude from the bottom surface of the air supply duct, the plurality of nozzles are arranged at intervals in the running direction of the flexible support, the opening is in the form of a slit extending in the width direction of the flexible support, Wherein the first wind blocking member is provided at a position where the height from the flexible surface is lower than the air supply duct, and the flexible surface is a surface on which the dope of the flexible support is flexible. delete 9. The method of claim 8,
(E) a step of injecting a heated gas onto the non-lubricated surface of the flexible support which supports the flexible film from which the gas is injected from the first supply portion, thereby raising the temperature of the flexible film;
(F) a step of suppressing the outflow of the gas to the side portion of the non-lubricated surface corresponding to the exposed portion by the second wind block member, the method comprising:
Wherein the heated substrate is sprayed in a direction perpendicular to the non-lubricated surface, the non-lubricated surface is a surface opposite to the flexible surface of the flexible support,
Wherein the second wind shielding member extends along a running path of the flexible support and is installed to face the first wind shielding member with the flexible support interposed therebetween. 8. The method of claim 7,
(G) further comprising the step of drying the flexible film by sending a countercurrent gas to the film surface after the step C,
Wherein the C step is performed on the flexible film on the flexible support which runs with the flexible surface of the flexible support facing the flexible surface. 12. The method of claim 11,
Wherein the G step is performed on the flexible film on the flexible support running with the flexible surface facing downward.

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