TW201132686A - Solution casting method - Google Patents

Abstract

A casting film 32 is cooled on a drum 29 to be hardened, and then peeled from the drum 29. A wet film 16 is supported by being bridged over a circumferential surface of a peel roller 33 to be transported. Thus, the casting film 32 is peeled. In a second space between the drum 29 and the peel roller 33 is disposed a route controller 36 for controlling a route for transporting the wet film 16. The route controller 36 includes a chamber 55 and a pump 56 for sucking gas inside the chamber 55. A suction force of the pump 56 is adjusted by a controller 57. The route controller 36 decompresses the second space such that the route for transporting the wet film 16 to the peel roller 33 has a convex shape toward the second space.

Description

201132686 i//5Zpit VI. Description of the Invention: [Technical Field of the Invention] A method for forming a solution for producing a polymer film. [Prior Art], cellulose bismuth oxide ring-hydrocarbon _ each film is used according to the way. Cutting is sometimes done in groups that should be combined, but sometimes in the same way as the combination that should be combined. For example, in the production of a polarizing plate, the amine film of the protective film which protects the polarizing film is made of an amine. In addition, when the two sides of the polarizing film are disposed on the opposite side of the polarizing film, the side is replaced by an optical compensation film (including a retardation film). In this way, optical supplemental gamma is sometimes used as a protective film.

Am, when a polarizing plate is formed by a film having a multilayer structure including a thinned and protective enamel, and is cut into a desired size, pressing the cutting blade from one of the film faces is performed on the multilayer structure. The image field f' sometimes cracks from the cut formed by the cut surface toward the protective film. The protection of such cracks due to the cutting was evaluated as poor workability, and the commercial value of the obtained polarizing plate was also remarkably low. And in the manufacture of the liquid crystal display, the polarizing plate is attached to the glass base: = the glass substrate is peeled off after the polarizing plate is attached, and sometimes the protective film is partially residual == on the substrate. This does not peel off the whole part and remains on the broken substrate. This 201132686 37782pif-like protective film is evaluated as poor reworkability, and is not preferred. The method of artificially producing the poly S film used in the optical use towel such as a display device as described above is a riding method. The transfer gamma method is to form a cast film by laminating the concentrated solution of the polymer on the support to form a cast film, and solidifying the flow to form a flow film of the flow. The film formation of this solution is known as a dry casting method and a cooling gelation casting method according to the flow rate. The dry casting method is to dry the cast film to the desired level of drying by solidifying the cast film. In other words, after the peeling, the cast film is dried until it is wet and is in a transportable state. The cooling gelation casting method is formed into a gel state by a cooling cast film in a state where the residual ratio is extremely high, and is solidified to gelation even if peeling can be carried out. Compared with the above dry casting method and the cooling gelation casting method, the latter can be peeled off from the support when the solvent residual rate is high, so that it is obviously advantageous in manufacturing. However, the polymer film which is cooled by the gelation casting is loaded in the above-mentioned processing suitability and is not as good as the dry casting method, and the desired performance is exhibited/imaged. The cooling gelation casting method is effective to manufacture, that is, to increase the amount of film produced per unit time, and various proposals have been made. For example, in Japanese Patent Laid-Open No. 2000-239403, a method of peeling off a blown air stream of a cast film from a support is proposed. According to this method, a film having an intended retardation can be efficiently produced. In the Japanese Patent Laid-Open Publication No. 2001-198933, the film surface which is separated from the support from the nozzle to the wet film immediately after peeling is sprayed at a speed of 20 m/sec or more in a direction perpendicular to the film surface. The wind. In the case where the solvent residual ratio at the time of peeling from the support is a high value of 100% or more, the cast film can be stably peeled off from the support to produce a flatness. Polymer film. However, even if the method of the Japanese Patent Laid-Open Publication No. 2000-239403 and the Japanese Patent Publication No. 2001-198933 is applied to a cooling gelation casting method in which the high solvent residual ratio is peeled off and dried, the processing suitability and rework cannot be achieved. Improvement of sex. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a solution film forming method for improving the processability and reworkability of a film produced by a cooling gelation casting method. The solution film forming method of the present invention comprises a cast film forming step, a cast film cooling step, a peeling step, a pressure control step, and a drying step. In the cast film forming step, a cast film is formed by continuously casting a dope in which a polymer is dissolved in a solvent onto a support. In the casting film cooling step, the aforementioned casting film is cooled and solidified. In the peeling step, the cast film was peeled off to obtain a wet film. The cast film was peeled off while the solvent was left. The cast film is peeled off by winding the wet film around the circumferential surface and transferring the wet film. The roller is disposed such that its longitudinal direction coincides with the width direction of the casting surface of the support. The above-described roll is provided on the side opposite to the support on the conveying path of the wet film. In the pressure control step, the force of the second space is less than the upstream of the roller, and the force of the second space is smaller than the pressure of the first space.

201132686 3//82 piI force' is such that the forward path of the wet front toward the front is made = two: The first space is the space on the film surface of the wet film peeled from the support. The second space is a double-sided film. , room. The drying step towel is obtained by drying the film to form the cold liquid film forming method, preferably by sucking a gas suction roll closer to the gas in the second space upstream, "from the second day of the Sangha transfer to the predecessor The second space between the extension __ position and the front _ is depressurized. Preferably, the suction device includes the second space 外部 external space _ chamber to be depressurized, and is controlled by adjusting the pressure in the chamber. Preferably, the transport path ❶ of the wet film facing the roller is controlled such that the angle Θ1 formed by the surface of the branch bud and the wet film in the peeling position is 3 G. The range is 80 or less. According to the solution film forming method of the present invention, a film excellent in processability and reworkability can be produced in spite of cooling gelation cast enthalpy. The above features and advantages of the present invention are more apparent and easy to understand. The embodiment of the specific cattle is described in detail below with reference to the drawings. [Embodiment] The solution film forming apparatus 10 of Fig. 1 includes a wet film forming apparatus 17, a tenter 18, a second tenter 19, and a roller. Drying device 22 and coiling device 24. The wet film forming apparatus 17 forms the wet film 16 from the dope 13 in which the polymer u is dissolved in the solvent 12. The first tenter 18 is maintained by the holding mechanism (not 8 201132686 3//δ2ριί diagram =) Each side of the wet film is conveyed while being dried until it reaches a predetermined retention rate. The second pull = mechanism (not shown) holds the side of the wet film 16 and applies a width of two 2 to the appropriate tension - The drying step is carried out. The county set 2' is conveyed through the wet film 16 of the second tenter 19, and is subjected to "drying and drying. 23. The winding device 24 takes the dry (four) film 2 into a shape. The film forming apparatus 1G includes a narrow view of the end portions of the second tenter drying device 22 and the transfer paths of the roll drying device 22 and the winding device to cut off the respective sides of the wet film 16 and the film 23, but is omitted. The wetting film forming apparatus 17 includes a drum 29 as a branch body, and has a driving mechanism (not shown). The driving mechanism rotates on the outer circumference = 1, and the circumferential surface 29a becomes a casting dope 13 No _ Rolling 29 has a casting die with a flow of concentrated liquid n. Drunk: = 31 continuous rotating drum 29, the dope 13 is discharged, and the dope 13 is formed as a casting film 32. Further, the slave mold 31 to the roll = 9^ dope 13' is disposed upstream in the rotation direction of the drum 29: The decompression chamber attracts the atmosphere of the upstream side region of the effluent concentrate 13 to decompress the region. The heart solidifies the ruthenium film 32 to the second after the transfer to the first tenter 18 The solvent-containing state is peeled off from the drum 29. The drum has a temperature controller 34 that controls the temperature of the circumferential surface 29a. By the temperature controller, the temperature of the peripheral surface 29a is programmed to cool the flow & 201132686 3//S2pit temperature and solidified by this cooling. At the time of peeling, the wet film 16 is supported by a peeling roller (hereinafter referred to as a peeling roll) 33, and the peeling position PP (see Fig. 2) from which the casting film 32 is peeled off from the roll 29 is kept constant. A path control portion 36 that controls the path of the wet film 16 toward the peeling roller 33 is provided upstream of the peeling roller 33. The method of peeling the cast film 32 from the drum 29 will be described later using other drawings. The wetting unit 17 is conveyed to the transfer portion of the second tenter 18 by the peeling of the wet enthalpy 16 formed by the rollers 48 and guided to the first tenter 18. In the first tenter 18, the holding mechanism (the end of the side of the 16th, and the captive of the cockroach should be broadcasted), the film holding mechanism is maintained, and the film is transported by the mechanism. b. Capture

Side end _ system _ 16. At the same time as the wet film W width: rrr, the clips and the u holding means for holding the side end portion of the wet film I6 are predetermined for the width direction of the wet film 16 at the predetermined timing. The tenters 18 and 19 are formed as inner portions of the first and second tenter machines 18 and 19, and the chamber for the passage is formed. In these catheters (not shown), a catheter (not shown) is used. A plurality of inlet nozzles (not shown) and „opposing nozzles are formed separately (not shown in the figure 201132686^7782ριί gas 11, the drying gas from the nth nozzle, and the degree of attraction from the suction nozzle and the L-body 18) , 19, the interior of the 19 is kept as a long-lasting wet long-term meat Qiu Bing II, and by the passage of the first, second tenter 18, 丨9, the ancient wet film 16 is dried. 1 The tenter 18 is dried and wet, and the 2 is formed so as to be able to be gripped by the clip of the second tenter 19. The wet film 16 passing through the second tenter 19 is kept by a narrow:::: The central portion between the side portion of the mark pg side and the side wall of the other side is sent to the roll drying device 22. If the wet line 16 (four) line is located at the county level 22, the plurality of rolls 21 arranged by the = column The circumferential support. These light 21 = moving light 'transmitted by the rotation of the drive roller. The light-drying device 22 has a conduit for flowing out the dry gas = as a space separating the dry gas from the outside The chamber shape is not formed on the dry skirt 22, and is formed by an exhaust port, which is sent out from the guide, and the roller body is exhausted from the exhaust port, and the inside of the roller drying farm 22 is The humidity of the gas and the concentration of the solvent gas are dried by the wet film 16 of the drying device to form the film 23. Internally, the film 23 dried by the roll drying device 22 is continuously cut by a slitting device with a slitting blade. The side ends are cut and removed. One of the woods is shown in the middle portion between the end portion and the other side end portion, and the side portion which is sent to the winding side is taken up into a roll shape. 24, 11 201132686

J / /8/plI The peeling process will be specifically described with reference to Figs. 2 and 3 . In Figs. 2 and 3, an arrow Z1 indicates the conveying direction of the wet film 16, and an arrow Z2 indicates the width direction of the wet film 16. Further, the width direction of the circumferential surface 29a coincides with the width direction Z1 of the wetting enthalpy 16. Figs. 2 and 3 are schematic views showing the peeling roller 33 with a small thickness relative to the thickness of the wet film 16. In the following description, the space on the film surface side of the wet film 16 which is peeled off from the drum 29 is referred to as a first space, and the space on the other film surface side is referred to as a second space. The other film surface of the wet film 16 means a film surface exposed to the outside when it is the casting film 36. The peeling roller 33 is disposed such that its longitudinal direction coincides with the width direction of the circumferential surface of the drum 29. The peeling roller 33 is provided on the side opposite to the roller 29 on the conveying path of the wet film 16. In other words, since the drum 29 is provided in the first space, the peeling roller 33 is provided in the second space. The peeling crucible 1 33 is provided with a drive mechanism 70 and a controller 71. The controller 71 controls the drive mechanism 70. By the drive mechanism 70, the peeling roller 33 is rotated in the outer circumferential direction at a predetermined rotation speed. When the signal of the rotational speed of the set peeling roller 33 is input, the controller 71 controls the drive mechanism 7 to rotate the peeling light 33 at its set speed. The peeling light 33 is supported by the circumferential surface to support the wet film 16, and the wet film 16 is conveyed by rotation. The roller 29 and the peeling roller 33 are disposed in such a manner that the wet film 16 is wound around the peeling roller 33, and the transport path below the peeling roller % is defined. In this manner, the wetting film 16 is wound around the peeling roller 33, and the wet film 16 is conveyed by the peeling roller 33, whereby the casting film 32 is peeled off from the drum 29. Further, the peeling roller 33 may not necessarily be a driving roller, and may be a so-called driven 12 201132686 J7782 pif 从 which is driven by the wet raft 16 being conveyed to contact the circumferential surface. In the case of the 隹 种 species, the official 剌 辊 辊 ~ ~ ~ 。. Further, the wetting 貘 ^ is supported by the peeling roller 33, and the weir path control unit 36 is provided with a space between the drum 29 and the stripping unit. The path control unit 36 controls the wet film 16 to be turned over, and the first path control unit 36 includes the chamber 55, the pump 56, and the controller. The chamber 55 includes an i-th member 61, a second member 62, a fourth member 64, and a fifth member 65. The first! The structure 63, = and the upstream direction of the transfer direction Z1 of the 16 is == h. The second member 62 separates the outer space of the side portion side of the second side portion of the second member portion to be depressurized. In the first step 仵65, the second space to be decompressed and the outer portion below are = and the middle member to the fourth member 61 =. and

= the first opening opposite the wet film 16. From this! J cited ^55 external gas. The plate-shaped i-th to fifth members 61 to =4 are arranged in an upright posture. The middle illusion 罘 罘 构件 i member 61 is disposed in consideration of the casting film 32 and is disposed at a distance from the drum 29 in the range of 25 (8) handsome to 13 201132686 37782pif. The conveying direction Z1 t& the downstream end 29D of the drum 4 is closer to the upstream. The target member 62 is changed to the distance from the peeling roller 33 in consideration of the click of the wet film 16 in the range of the predetermined degree. On the Z1, the 25GG division is lower than the upstream end 33Uf and the downstream end 62D of the peeling roller 33, and the gas inside the second formation is formed by the second opening: .69 Wei 56 connection' The third member 63 of the chamber and the side member 16e of the fourth member 64 are disposed closer to the outer side of the side member 16e. Thus, the climbing film 16 does not have a thirst with the third member 63 and the fourth member, and the wet film 16 pairs of sides of the ^ ^ side view like 'become the ridge, the marrow〗 〖Blood ~ way in the second picture, so it does not necessarily have to be the surface of the surface of the surface of the overlapping surface, but also within the ^Hi internal The gas is corrected to a reduced pressure state. If the second = between the chamber roller 29 and the peeling roller 33 is set, it can be set to be lower than the first space. The J workspace also ί (the symbol Α indicated by the seat line in Fig. 2) becomes: the diameter ^ so that the wet _16 toward the peeling mirror 33 is close to the chamber 55, and the curved road map is viewed from the side, the servant side 'The second path control unit 36 is a convex shape. In this way, the second space between the second space _33 of the gas paste is reduced by two. 201132686 The 37782pif path has a convex shape on the second space side. By causing the transport path of the wet film 16 to be convexly peeled off on the second space side, the force applied to the wet film 16 in the longitudinal direction of the wet film is more greatly reduced than in the related art. Give more force in the strip for peeling. Therefore, the orientation of the polymer of the wet film 16 in the direction of the film surface (hereinafter referred to as the plane orientation) is suppressed, and both the workability and the reworkability are improved. . On the right side of the sputum, if the force at the time of peeling is too large, the wet film 16 can be cut by peeling. The faster the manufacturing speed is, the more the secret solvent ratio is doubled, so that the casting film 32 and the roller 29 are more adhesive. Since the force at which the film forming speed is increased as the value of the filming speed is increased, the A becomes more, so it is also accommodated. On the other hand, according to the above method of the present invention, since the force applied for peeling is further reduced at a certain degree (four), there is an effect that the manufacturing speed can be further increased. Further, in the root method, since the thirst 16 = gas injection having a very high solvent residual ratio immediately after the peeling is not performed, the smoothness of the surface of the film 16 (10) is maintained, and contamination by foreign matter can be avoided. As above, by controlling the wetting film toward the peeling roller 3 3! 6 ^ ' can increase the angle Θ1 formed by the circumference s of the drum 29 in the peeling position PP and the wet film 1, so that it is easy to control the force required for the paste. And Γί is the angle Θ1 formed by the circumferential surface 29a of the drum 29 in the peeling position PP and the wet film 16 is set to 30. Above 80. The following range. When the angle Θ1 formed by the circumferential surface 29a of the drum 29 and the wet film 16 in the peeling position pp becomes larger, the winding center angle θ2 15 201132686 37782pif with respect to the peeling pro 33 is easily maintained. The winding becomes larger than the winding center angle when the straight path A is formed. The winding center angle Θ 2' also makes it easier to maintain the convex shape of the drum 29 and the peeling roller. The fan-shaped shape formed by the peeling of the pro-33 is additionally. The winding center angle θ2 is a central angle of the circular shape of the winding region 72 wound by the wet film 16 and the peeling roller 33. From the further enlargement of the peeling position ΡΡ, the angle Θ1 formed by the full film 16 of the drum 29 and the winding center angle; a wet embodiment, preferably ❹_33 does not serve as a view of the shape of the conveying path that protrudes on the second space side. The large protrusion (4), the rotation speed of the driving roller can be reduced, or it can be further increased by the suction of the chamber 55 to the conveying path of the second roller: 16 of the peeling roller 3, (4) μ = brewing lightly advances - the step of increasing the peeling position ρρ of the drum 29 ^ is the angle Θ 1 formed by the wetted film 16 and the winding center angle. ° & In the present embodiment, the dragon is performed in a manner that the second space is lower than the first hollow _, but the present invention is not limited thereto. For example, = decompression in the second space, or pressurizing the i-th. The pressurization is not the pressurization under the secret pressure, and the pressurization under the static pressure/, the pressurization of the press can be performed by repeating the following transfer operation and stop 2 to perform the aforementioned feeding operation to include the roller. A portion of the downstream side of 29 and a portion of the upstream side of the peeling 3 3 are formed by a chamber (not shown; a straight path surrounding the first space and the wet film 16 is entangled, and the gas is supplied therein at a certain time. The stop operation is stopped for a certain period of time and is sent to 201132686 s//} SZpit. According to this method, the occurrence of dynamic pressure such as gas injection can be greatly suppressed and pressure can be applied to the wet film 16 from the first space side. In addition, when the gap between the rolling sheet 29 and the peeling roller 33 is set to a minimum of several mm, the pressure difference can be surely applied to the first space and the second space by this method. The slit-shaped opening extending in the direction Z2 attracts the gas, and the smoothness of the film surface can be surely maintained. The method for providing a pressure difference between the first space and the second space to the roll 29 and the peeling roll 33 is used. There are other methods. For example, there are the following methods. A chamber (not shown) surrounding the membrane forming device 17 (see FIG. 1) is disposed in the chamber 55 or the chamber (not shown) surrounding the linear path A of the first space and the wet film 16 in the chamber (not shown). The gap between the internal air and the air force is set. By separately controlling the pressure of the space opened by the partitioning member, it is possible to compare the transmission path of the wet _ 16 with the second air _ tilting force difference between the lower and the lower. In order to utilize the surface (four) or more, the pressure difference is further improved. When the distance between the drum 29 and the peeling roller 33 is 5 〇〇 ', the following method may be used: the chamber 55 is not used or surrounded; The linear path of the wet _ 16 is a chamber (not shown) that surrounds the entire membrane forming device 17 (i # 31 to (not shown) and is equipped with (see Fig. 1), and is opened by a member. It is preferable to divide the pressure difference by the separation.) It is preferable that the first space spot 2 is determined by the pressure difference between the windings in the peeling _33 depending on the peeling position. It is preferable that the solvent residual ratio of the solvent residual film 16 is one step. Larger out. This is because, ί increases the pressure difference and makes the transfer path inlet the larger the residual rate of the grain, the roller 2 9 And stream 17

201132686 3//82piI The stronger the adhesion of the film 32, and the more easily the wet film 16 is broken. The peeling position PP is formed toward the center in the width direction Z2, and is formed on the downstream side in the rotation direction of the drum 29. Therefore, the force applied to the longitudinal direction of the wet film 16 at the time of peeling becomes larger toward the center in the width direction Z2, and the surface orientation becomes larger. Therefore, it is more preferable that the pressure in the second space is lowered toward the center in the peeling position pp. Thereby, the film 23 whose surface orientation is constant in the width direction Z2 can be manufactured. In order to lower the pressure in the second space toward the center of the peeling position pp, for example, a separate chamber (not shown) is provided inside the chamber 55 to independently control the internal pressures of the chamber and the chamber 55. The present invention is particularly effective when the polymer 11 (refer to Fig. 1) is a cellulose halide. The following a has been carried out as an embodiment of the present invention and a comparative example to the present invention. [Example 1] A film 23 was produced by a cold portion gelation casting method. A partition member (not shown) is provided inside the wet film forming apparatus 17 to apply a pressure difference to the second space and the second space. The first space is pressurized so that the pressure is wider than the atmospheric pressure, and the transport path of the wet 16 is convex in the second space. The pressure in the other 2nd space is equal to the atmospheric pressure. Accordingly, the speed ratio of the drum 29 to the I chain 33 is changed so that the peeling position becomes strange, and the film is formed from *, and the pressure (Pa) of the first space, and "second" in Table 1 The value of each pressure (Pa) '' is based on atmospheric pressure. That is, the case where the pressure is equal to the atmospheric pressure is described as 0 (zero), and the case where the pressure is higher than 201132686 • ί//δ2ριΐ· atmospheric pressure is described as a positive value, and the case where the pressure is lower than the atmospheric pressure is described as a negative value. Regarding the obtained film 23, processing suitability and reworkability were evaluated according to the following methods and criteria. The results are shown in Table 1. (I) Processing suitability The obtained film 23 was adhered to both sides of the polarizing film by an adhesive to form a polarizing plate. The polarizing plate was punched into a rectangle of 1 〇 cm x 1 〇 cm with a cutter as a sample for evaluation. It was evaluated whether or not cracks occurred from the long side edge of the sample for evaluation, that is, the cut surface to the inside of the film 23, and the degree of the crack to be confirmed was evaluated for the suitability according to the following criteria. The crack may be broken from the cut surface of the film 23 toward the inside, and may be peeled off between the polarizing film and the film 23. According to the following criteria, A to C are the levels of acceptable processing suitability, and D is the level of unsuitable processing suitability. A: No crack is observed, or although cracking occurs, the crack range that occurs is controlled to be less than 25% of the length of the long side. B. The range in which cracks occur is controlled within a range of 25% or more of the length of the long side and less than 50%. C: The range in which the crack occurs is controlled in the range of 5 % or more of the length of the long side and not more than 75%. D. The range in which cracks occur is 75% or more of the length of the long side. (ii) Rework

The obtained film 23 was adhered to both sides of the polarizing film by an adhesive to form a polarizing plate. After the polarizing plate is attached to the glass substrate, it is peeled off from the glass substrate. The degree of residual peeling of the film on the glass substrate was visually observed, and the reworkability was evaluated according to the following criteria. And according to the following criteria, A~C 201132686 ο / /οζριι is the level of reworkability, and D is the level of rework failure. A: No residue was observed at all. B: There is little degree of residual shedding. C: Although there is little residual shedding, there is no practical degree of application. D: There is a lot of residue falling off. [Embodiment 2] A partition member is provided inside the wet film forming apparatus 17 (not shown so as to apply a pressure difference to the first space and the second space. The second space is depressurized so that the pressure is lower than the atmospheric pressure by 1 GPa. And the wet film is formed in a convex shape on the second space side. The pressure in the first space is equal to the atmospheric pressure. Others are the same as in the first embodiment. [Example 3] The solution film forming apparatus, that is, the path control unit 36 of Fig. 2, decompresses the second space so that the pressure is 30 Pa lower than the atmospheric pressure, that is, the pressure P2 of the second space is equal to the atmospheric pressure. The differential pressure P2-P1 of the pressure P1 in the first space is _301^, and the differential pressure is applied to make the transport path of the wet film 16 convex on the second space side. The peeling pro 33 is a driving roller. By adjusting the speed ratio of the rotation of the drum 29 and the peeling roller 33 so that the peeling position PP is constant, the film 23 is produced. [Example 4] The second space is further decompressed by the path control unit 36 than the first space (difference The pressure P2-P1 is -l〇〇Pa), so that the transmission path of the wet film 16 is at the second 201132686 J//82p The space side has a convex shape and the Θ1 is 80. The pressure in the first space is equal to the atmospheric pressure. The fifth embodiment is similar to the third embodiment. [Embodiment 5] The second space is compared with the path control unit 36. The first space is further decompressed (differential pressure Ρ2-Ρ1 is -30 Pa). The transport path of the wet film 16 is convex on the second space side. The pressure in the first space is equal to the atmospheric pressure. The drum 29 and the peeling roller 33 are The speed ratio of each of the speeds was adjusted so that the angle Θ1 formed by the circumferential surface 29a of the drum 29 and the wet film 16 in the peeling position PP was 30°. The same procedure as in the third embodiment was carried out. (Example 6) The path control unit 36 further decompresses the second space from the first space (the differential pressure P2-P1 is -30 Pa). The transfer path of the wet film 16 is convex on the second space side. The pressure is equal to the atmospheric pressure, and the respective speeds of the drum 29 and the peeling roller 33 are changed to adjust the speed ratio of the both, so that the angle Θ1 formed by the circumferential surface 29a of the drum 29 and the wet film 16 in the peeling position PP is 80°. Except for this, it is carried out in the same manner as in the third embodiment. [Embodiment 7] The path control unit 36 is used. 2 The space is further decompressed than the first space (the differential pressure P2-P1 is -30 Pa). The transfer path of the wet film 16 is convex on the second space side. The pressure in the first space is equal to the atmospheric pressure. The respective speeds of the peeling rolls 33 are changed to adjust the speed ratio of the both, so that the angle Θ1 formed by the circumferential surface 29a of the drum 29 and the wet film 16 in the peeling position PP is 90°. Otherwise, the same as in the third embodiment. [Comparative Example] 21 201132686 j//»zpit The film was produced by a cooling gelation casting method in a state where the path control unit 36 was removed from the solution film forming apparatus 10 of Fig. 1 . The pressure difference between the first space and the second space is 0 (zero), and the transport path from the drum 29 toward the wet film of the peeling roller 33 is a straight path as indicated by the symbol A in Fig. 2 . The respective speeds of the drum 29 and the peeling roller 33 were changed to adjust the speed ratio of the both, so that the circumferential surface 29a of the drum 29 and the angle Θ2 formed by the wet film in the peeling position PP were 30°. The film 23 obtained in each of Examples 2 to 7 and the film obtained in the comparative example were evaluated for workability and reworkability, respectively, according to the same methods and standards as in Example 1. 22 201132686 ^//δζρΐΐ

[Table 压力 Pressure of the first space Pressure of the second space with or without chamber 55 Θ1 Workability of rework (to atmospheric pressure) (for atmospheric pressure) (Pa) (Pa) (.) Example 1 10 0 No 50 B p> Example 2 0 - 10 No 50 BLB r > Example 3 0 -30 65 BB Example 4 0 - 100 80 Δ A Example 5 0 -30 There are 30 r > A Example 6 0 -30 There are 80 ο ---------- Δ -~~§_ Example 7 0 -30 has 90 r\. 一一c A Comparative example _______0_ 0 No 30 D c D Too private day ^Invention has been revealed as above, However, it is not intended to limit any (4) technical field towels with the usual knowledge, without departing from the spirit of the moon and the scope of the _, # can make some changes and refinement 3 Ming's protection scope is attached to the t-recognition patent For the car [simple description of the map] 々平. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a solution film forming apparatus in which the present invention has been carried out. 2 is a schematic diagram of a path control unit. Fig. 3 is a schematic diagram of a road control unit. 23 201132686 »/ / / [Description of main component symbols] 10 : Solution film forming apparatus 16 : Wetting film 17 : Wetting film forming apparatus 23 : Film 29 : Roller 32 : Cast film 33 : Peeling roll 36 : Path control part 55 : Chamber 72: Winding area 24

Claims (1)

201132686 3//δζρπ VII. Patent application scope: 1. A solution film forming method, characterized in that the method comprises the steps of: forming a cast film by continuously casting a polymer dope dissolved in a solvent on a support; The cast film is cooled and solidified; the cast film is peeled off to obtain a wet film, and the cast film is peeled off while leaving the solvent, and the wet film is wound around the circumferential surface of the roll to convey the aforementioned a wet film for peeling off the cast film, wherein the roll is disposed such that a longitudinal direction thereof coincides with a width direction of a casting surface of the support, and the roll is provided on a side opposite to the support on a conveying path of the wet film; The pressure of the second space that is closer to the upstream than the roller is smaller than the pressure of the first m, so that the transfer path toward the film forming direction (4) protrudes toward the second space side, and the first m is the wet film from the foregoing The space on the film surface of the side which is peeled off, the second space is the space on the other film surface; and the wet film is dried to form a film. The method of forming a solution according to the invention of claim 1, wherein the gas suctioning device attracts the gas in the second space upstream of the roller, thereby peeling off the branch frequency. The second space between the peeling position of the casting film and the roller is decompressed. The solution film forming method according to claim 2, wherein, (1) the introduction device includes a second space disk to be decompressed; = = = the pressure in the chamber to control the Lai 25 201132686 J 4. The solution film forming method according to claim 3, wherein the surface of the support body and the wet film in the peeling position are at an angle of 30 by controlling the path. ° above 80 ° below the range. 26