JP5412181B2 - Web manufacturing method and manufacturing apparatus, and optical film manufacturing method and manufacturing equipment - Google Patents

Description

  The present invention relates to a web manufacturing method and manufacturing apparatus, and an optical film manufacturing method and manufacturing equipment.

  Polymer films (hereinafter referred to as “films”) are widely used as optical films because of their features such as excellent light transmission, flexibility, and reduction in weight. Among them, the cellulose acylate film is also used for optical films such as a protective film for a polarizing plate and a retardation film (for example, a viewing angle widening film) of a liquid crystal display device whose market is rapidly expanding.

  As a main method for producing a polymer film, a solution casting method and a melt casting method are known. In the solution casting method, a polymer solution containing a polymer and a solvent (hereinafter referred to as a dope) is discharged onto a support to form a cast film, and the cast film has self-supporting properties. In this method, the film is peeled off from the support at a time to form a wet film, and the wet film is dried and wound up as a film. The solution casting method is superior to the melt extrusion method in which a melted polymer is extruded with an extruder to produce a film, and it is possible to obtain a film with less foreign matter, and thus a film, in particular, A solution casting method is adopted as a method for producing an optical film.

  This solution casting method is roughly classified into a drying method and a cooling gelation method, depending on the method of causing the cast membrane to exhibit self-supporting properties. In the drying method, the solvent is evaporated from the cast film on the support until the amount of the residual solvent in the cast film falls within a predetermined range. On the other hand, in the cooling gelation system, the casting film on the support is cooled in order to reduce the fluidity of the solvent contained in the casting film (for example, Patent Document 1 or 2).

Incidentally, retardation is used as an index of the optical properties of the film, thickness and birefringence ΔN of the film - that is dominated by the (refractive index n _o for = normal light refractive index n _e for extraordinary _ray) Are known. Therefore, in order to produce a film having a retardation within a desired range, in the solution casting method, a measure for suppressing the occurrence of uneven thickness of the film (for example, Patent Document 1) and the orientation of polymer molecules are set to a predetermined one. A measure (for example, Patent Document 2) is adopted.

  Patent Document 1 describes an invention in which air on the back side of a bead is sucked using a decompression chamber. As a result, it is possible to prevent the entrained air generated on the surface of the support from flowing to the vicinity of the bead due to the travel of the support, and as a result, the vibration of the bead, which is the cause of thickness unevenness, and the membrane and the support Inflow between the surfaces can be prevented.

  Patent Document 2 describes an invention in which a preheat treatment, a stretching process, and a relaxation process are performed on a film adjusted to a temperature within a predetermined range in a stretching apparatus. Thereby, the retardation of the film can be adjusted to a desired one.

JP 2008-238697 A JP 2007-90866 A

  However, even when the measures described in Patent Document 1 and Patent Document 2 were taken, unevenness in optical characteristics occurred frequently. In particular, in the crossed Nicols method, unevenness of in-plane retardation Re measured in a state where the transmission axis of the polarizer and the slow axis of the film intersect at 45 ° was remarkable.

  As a result of intensive studies, the inventor has found that the unevenness of the optical characteristics is caused by the variation in the orientation of the polymer molecules, and the tendency of the variation in the orientation of the polymer molecules correlates with the tendency of the slight thickness unevenness of the cast film. I found out that there is. Furthermore, the inventor has found that the variation in the orientation of the polymer molecules is caused by the uneven thickness of the cast film and the peeling tension applied to the cast film at the time of peeling from the support.

  In order to suppress the occurrence of the unevenness of the optical characteristics, even if the measure described in Patent Document 1 is used, the cast film formed on the support is likely to have a thickness unevenness although it is small, and It is clear that the cause of this uneven thickness is not only the vibration of the bead caused by the accompanying air, but also the pressure fluctuation caused by the fluctuation of the suction amount of the decompression chamber and the mechanical vibration of the casting die and the support body. became. Therefore, the method described in Patent Document 1 cannot prevent the unevenness of the optical characteristics.

  Further, the measure described in Patent Document 2 is to adjust the average optical characteristics of the entire film, and it is difficult to individually adjust the optical characteristics according to the thick part and the thin part. is there. Therefore, the method described in Patent Document 2 cannot prevent the unevenness of the optical characteristics.

  The present invention solves the above-described problem, and a web manufacturing method and apparatus for peeling a cast film from a support, and an optical film so as to prevent stripping tension from being applied to the cast film as much as possible. A method and manufacturing equipment are provided.

The web manufacturing method of the present invention includes a film forming step of discharging a dope containing a polymer and a solvent to a support and forming a film made of the dope on the support, and both ends of the film using a gripping member. An ear part grasping step for grasping the ear part in the inner part, a center part peeling step for peeling a central part between the ear parts from the support body, and a support part of the film on which the ear part is grasped. And an ear part peeling process for peeling the ear part, and the ear part peeling process is performed before the ear part gripping process .

In the center peeling step, it is preferable to grip the ear using a plurality of gripping members .

  The method for producing an optical film of the present invention is characterized in that the film is dried after peeling the film from the support using the above-described web production method. In the film forming step, the film is preferably cooled such that the dope forming the film is gelled.

The web manufacturing apparatus of the present invention includes a discharge unit that discharges a dope containing a polymer and a solvent, a support that forms a film made of the discharged dope, and a peeling unit that peels the film from the support. An ear support that includes a gripping member that grips the ears at both ends of the membrane and a gripping member travel path on which the gripping member travels , and the support supports the ears And a central part support that supports a central part between the ears of the membrane, and the peeling part is a central part peeling mechanism that peels the central part from the central part support and an ear part support. An ear part peeling mechanism that peels the ear part from the body, the ear part support body and the center part support body run, and the ear part peeling mechanism and the center part peeling mechanism run the center part support body or the ear part support body. The ear peeling mechanism is more central than the central peeling mechanism. The gripping member traveling path is provided from the upstream side of the central part peeling mechanism to the downstream side in the traveling direction of the central part support body, and is provided upstream of the central part peeling mechanism. The gripping member traveling path is provided with a gripping start portion for starting gripping of the ear portion by the gripping member .

The web manufacturing apparatus of the present invention is a film that forms a pair of a discharge part that discharges a dope containing a polymer and a solvent, a support that forms a film made of the discharged dope, and a peeling part that peels the film from the support. And a conveying part comprising a gripping member traveling path on which the gripping member travels, and the support includes an ear support that supports the ear, and an ear of the membrane. A central part support that supports the central part between the parts, and the peeling part is a central part peeling mechanism that peels the central part from the central part support and an ear part peeling mechanism that peels the ear part from the ear support The ear support and the center support travel, and the ear peeling mechanism and the center peeling mechanism are arranged so as to line up in the running direction of the center support or the ear support. The mechanism consists of a central running path of the central support and an ear running path of the ear support. The travel path includes an ear parallel path that is provided on both sides of the central travel path, and an ear separation path that is provided on the downstream side of the ear parallel travel path and that is provided to be separated from the central travel path. It is configured as a feature .

The ear peeling mechanism is provided on the upstream side in the running direction of the central support body relative to the central peeling mechanism, and the gripping member running path is downstream from the upstream side of the central peeling mechanism in the running direction of the central support body. It is preferable that a gripping start portion for starting gripping of the ear portion by the gripping member is provided in the gripping member travel path provided on the upstream side of the central part peeling mechanism. The central part peeling mechanism includes a central part traveling path and a gripping member traveling path of the central support, and the gripping member traveling path includes gripping member paralleling paths provided in parallel on both sides of the central part traveling path, and the gripping member parallel path. It is preferable to have a gripping member peeling path provided on the downstream side of the running path and provided so as to be separated from the central running path .

The web manufacturing apparatus of the present invention is paired with a discharge part that discharges a dope containing a polymer and a solvent, a support that forms a film made of the discharged dope, and a peeling part that peels the film from the support. A carrier having a gripping member that grips the ears at both ends of the membrane and a gripping member traveling path on which the gripping member travels, and the support includes an ear support that supports the ears, and a membrane A central part support that supports the central part between the ear parts, and the peeling part is a central part peeling mechanism that peels the central part from the central part support and an ear part peeling that peels the ear part from the ear support An ear support and a center support, and the ear peeling mechanism and the center peeling mechanism are arranged so as to be aligned in the running direction of the center support or the ear support. The peeling mechanism is composed of a central part traveling path and a gripping member traveling path of the central support, The traveling path includes a gripping member parallel path provided on both sides of the central traveling path, and a gripping member separation path provided on the downstream side of the gripping member parallel path and provided to be separated from the central traveling path. It is characterized by having .

  An optical film manufacturing facility according to the present invention includes the above-described web manufacturing apparatus and a drying unit that dries the film peeled from the support.

According to the present invention, at little stripping tension in the portion to be a product, it is possible to strip the casting film from the support.

It is explanatory drawing which shows the outline | summary of the 1st optical film manufacturing method which has a 1st web manufacturing method. It is explanatory drawing which shows the outline | summary of a 1st optical film manufacturing equipment. It is a side view which shows the outline | summary of a 1st web manufacturing room. It is a perspective view showing the outline of the 1st run support. It is a perspective view which shows the outline | summary of a cooling drum and a rotating roller. It is a side view which shows the outline | summary of the ear | edge part traveling path and center part traveling path provided in a web manufacturing room. It is a perspective view which shows the outline | summary of the vicinity of the position Pe provided in a center part travel path. It is a side view which shows the outline | summary of the pin travel path provided in a web manufacturing room. It is a perspective view which shows the outline | summary of the vicinity of the position Pb provided in a center part traveling path, and the position Pc. (A) is explanatory drawing which showed typically a mode that the casting film was formed on a support body from the discharged dope. (B) is sectional drawing to which the principal part of the casting film was expanded. It is a side view which shows the outline | summary of the 2nd web manufacturing chamber which has a 2nd driving | running | working support body. It is explanatory drawing which shows the outline | summary of the 2nd optical film manufacturing method which has a 2nd web manufacturing method. It is a side view which shows the outline | summary of the 3rd web manufacturing chamber which has a 3rd driving | running | working support body. It is a perspective view showing the outline of the 3rd run support. It is a perspective view which shows the outline | summary of the cooling drum and rotation roller which comprise the 3rd driving | running | working support body. It is explanatory drawing which shows the outline | summary of the 3rd web manufacturing method. It is explanatory drawing which shows the outline | summary of the 4th web manufacturing method.

  As shown in FIG. 1, an optical film manufacturing method 10 includes a web manufacturing process 13 for producing a wet film 12 from a dope 11 containing a polymer and a solvent, and evaporating the solvent contained in the wet film 12 to optically remove the solvent from the wet film 12. And a drying step 15 for obtaining a film 14.

  The web manufacturing process 13 includes a film forming process 22, an ear peeling process 23, an ear gripping process 24, and a central peeling process 25. In the film forming step 22, the dope 11 is discharged onto the support to form a casting film 27 made of the dope 11 on the support. In the ear | edge part peeling process 23, the ear | edge part of the casting film 27 is peeled from a support body. In the ear gripping step 24, the ear of the casting film 27 is gripped. In the center part peeling process 25, the center part between the ear | edge parts among casting films 27 is peeled from a support body, and the casting film 27 is used as the wet film 12. FIG.

  As shown in FIG. 2, the optical film manufacturing facility 30 includes a web manufacturing chamber 31 and a winding chamber 32. In the web manufacturing chamber 31, the belt-like wet film 12 is formed from the dope 11 by the web manufacturing process 13 (see FIG. 1). Details of the web manufacturing room 31 will be described later. The wet film 12 is sent out from the web manufacturing chamber 31 toward the winding chamber 32. Between the web manufacturing chamber 31 and the winding chamber 32, a clip tenter 33, a drying chamber 34, and a cooling chamber 35 are sequentially provided.

  The clip tenter 33 imparts tension in the width direction while conveying the wet film 12 in the longitudinal direction, and widens the width of the wet film 12. The clip tenter 33 may be omitted.

  Further, it is preferable that an ear clip device 37 and a crusher 38 are provided downstream of the clip tenter 33. The ear clip device 37 cuts off the ear portion of the wet film 12 as slit-shaped ear dust. A cut blower (not shown) connected to the ear clip device 37 cuts the ear dust finely. An air sending device (not shown) sends the cut ear dust to the crusher 38, and the crusher 38 crushes the ear dust to make a chip. Since this chip is reused for dope preparation, this method is effective in terms of cost.

  A plurality of rollers 40 are provided in the drying chamber 34. In the drying chamber 34, dry air is applied to the wet film 12 conveyed while being wound around the roller 40 to evaporate the solvent contained in the wet film 12. The temperature of the wet film 12 in the drying chamber 34 is preferably 140 ° C. or higher and 180 ° C. or lower. By the drying process in the drying chamber 34, the wet film 12 becomes the optical film 14.

  In the cooling chamber 35, the film is cooled until the temperature of the optical film 14 reaches a predetermined temperature (for example, room temperature).

  A forced static elimination device 42 and a knurling roller 43 are provided between the cooling chamber 35 and the winding chamber 32. The forced static elimination device 42 eliminates static electricity so that the charged voltage of the optical film 14 falls within a predetermined range (for example, −3 kV to +3 kV). The knurling roller 43 embosses both edges of the optical film 14 and imparts knurling to both edges of the optical film 14. Thereafter, the optical film 14 is sent to the winding chamber 32 and wound around the winding core 48 while being pressed by the press roller 47.

  As shown in FIG. 3, the web manufacturing chamber 31 includes a casting die 51 that discharges the dope 11 (see FIG. 2), a running support 52 that forms the casting film 27 from the discharged dope 11, and a pin tenter 53. And a rotating roller 54. Since the traveling support body 52 travels in a predetermined direction, the casting film 27 formed on the traveling support body 52 is formed in a band shape.

  The traveling support body 52 has a support surface for supporting the casting film 27, and includes a cooling drum 56 and a band 57. As shown in FIGS. 4 and 5, the cooling drum 56 lies so that its axial direction is horizontal, and is provided so as to be rotatable about a shaft 58. Of the peripheral surface of the cooling drum 56, ear support surfaces 61 are formed on both side edges in the width direction (hereinafter referred to as A direction) of the casting film 27, and between both side edges in the A direction. A groove portion 62 is provided over which the band 57 is stretched.

  The band 57 and the cooling drum 56 are formed to be flush with each other when the band 57 is stretched over the groove 62. Further, the length of the band 57 in the A direction is equal to the length of the groove 62 in the A direction. In this way, the support surface for supporting the casting film 27 is formed on the surface of the band 57 by passing the band 57 over the groove 62 and the rotating roller 54 provided in the cooling drum 56. And the ear support surface 61.

  The cooling drum 56 and the band 57 are preferably made of stainless steel, and more preferably made of SUS316 so as to have sufficient corrosion resistance and strength. Moreover, it is preferable that the ear | edge part support surface 61 and the center part support surface 65 are grind | polished so that the surface roughness may be 0.05 micrometer or less. Further, the ear support surface 61 and the center support surface 65 may be subjected to a chrome plating process. For example, it is preferable to perform a so-called hard chrome plating process with a Vickers hardness of Hv 700 or more and a film thickness of 2 μm or more.

  As shown in FIG. 3, the control unit (not shown) drives the cooling drum 56, and the cooling drum 56 rotates endlessly about a shaft 58. The band 57 (see FIG. 5) and the band 57 stretched around the rotating roller 54 follows the rotation of the cooling drum 56 and travels endlessly. Thus, the travel support body 52 travels.

  It is preferable to run the running support body 52 so that the center support surface 65 and the ear support surface 61 run at equal speeds. In order to run the center support surface 65 and the ear support surface 61 at the same speed, the groove portion 62 may be provided with a fitting groove, and a fitting protrusion to be fitted with the fitting groove may be provided on the band 57. A fitting protrusion may be provided in the groove 62 and the fitting groove may be provided in the band 57. Note that the control unit may drive a rotating roller instead of driving the cooling drum 56.

  A temperature controller (not shown) is connected to the cooling drum 56 and the band 57, and the temperature of the ear support surface 61 and the temperature of the center support surface 65 are substantially constant within a predetermined range (−15 ° C. to 0 ° C.). Adjust so that In addition, the temperature of the ear | edge part support surface 61 and the temperature of the center part support surface 65 are preferable if it is a range which can peel the casting film 27. FIG. Therefore, in the present embodiment, the temperature of the ear support surface 61 is preferably equal to or lower than the temperature of the center support surface 65, and more preferably equal to the temperature of the center support surface 65. In addition, when the temperature of the ear | edge part support surface 61 is lower than the temperature of the center part support surface 65, it is preferable that the difference of the temperature of the ear part support surface 61 and the temperature of the center part support surface 65 is 5 degrees C or less. .

  As the travel support 52 travels, the web manufacturing chamber 31 has an ear travel path 71 and a center support surface 65 (see FIG. 4) on the ear support surface 61 (see FIG. 4), as shown in FIG. The central traveling path 75 is formed. The ear portion running path 71 is formed in pairs on both side edges in the A direction on the peripheral surface of the cooling drum 56 (see FIG. 4).

  The central travel path 75 includes a central parallel travel path 75a, a central separation path 75b, and a central return path 75c that are sequentially provided in the travel direction of the band 57. The central parallel path 75a has a pair between the position Pa where the traveling band 57 is introduced into the groove 62 (see FIG. 4) and the position Pc where the traveling band 57 is fed out of the groove 62 (see FIG. 4). Between the ear running paths 71. The central part separation path 75b is separated from the ear part traveling path 71 toward the downstream side in the traveling direction of the band 57 between the position Pc and the position Pe where the band 57 starts to be wound around the rotating roller 54. Provided. The central return path 75c is provided from the position Pe to the position Pa, and connects the central parallel path 75a and the central separation path 75b.

  Returning to FIG. 3, the casting die 51 has a discharge port for discharging the dope 11. The casting die 51 is disposed at a position Pb between the positions Pa and Pc so that the discharge port is close to the ear support surface 61 and the center support surface 65. The discharge port is formed in a rectangular shape and extends long in the A direction. The length of the discharge port in the A direction is longer than the length Wb of the band 57 (see FIG. 4) and shorter than the length Wd of the cooling drum 56 (see FIG. 4).

  As shown in FIGS. 3 and 7, the pin tenter 53 includes a pin plate 81 having a pin 80 as a gripping member, a pair of first pulleys 82, a pair of second pulleys 83, a first pulley 82, And a pair of chains (not shown) spanning the second pulley 83. A plurality of pin plates 81 are attached to a pair of chains (not shown) at a predetermined pitch.

  When the pair of pulleys 82 and 83 rotate under a control unit (not shown), the chain travels in a predetermined direction. As the chain travels, the pin 80 travels endlessly between a pair of pulleys. By providing the pair of pulleys 82 and 83 at desired positions, the travel path 85 of the pin 80 (see FIG. 8, hereinafter referred to as the pin travel path) can be made predetermined. The traveling speed of the pin 80 is preferably equal to the traveling speed of the band 57.

  In the present embodiment, as shown in FIG. 8, a pair of first pulleys 82 is provided on both sides of the central part separation path 75b at the position Pd, and a pair of second pulleys 83 is provided at a predetermined position Pf. Here, the position Pd is a predetermined position on the central part separation path 75b. As a result, the pin travel path 85 includes a pin parallel travel path 85a, a pin separation path 85b, and a pin return path 85c that are sequentially provided in the travel direction of the pin 80. The pin parallel path 85a is arranged in parallel on both sides of the central part separation path 75b from the position Pd to the position Pe. The pin separation path 85b is provided so as to be separated from the central part separation path 75b as it goes to the downstream side in the traveling direction of the pin 80. The pin return path 85c is provided to connect the pin parallel path 85a and the pin separation path 85b.

  As shown in FIGS. 3 and 8, a biting brush 88 may be provided so as to face the pair of first pulleys 82 via the pin travel path 85. In particular, it is preferable to provide the biting brush 88 on both sides of the central part separation path 75b at the position Pd. In order to evaporate the solvent from the wet film 12, a blower that applies predetermined air to the wet film 12 between the position Pd and the position Pf may be provided. The temperature of the air is preferably adjusted so as to be within a predetermined range.

  Further, a scraper roller 89 that peels the central portion 27a from the band 57 may be provided at the position Pe of the central traveling path 75 or on the downstream side of the position Pe. Instead of the scraper roller, the central portion 27a may be peeled from the band 57 using a spatula-like or blade-like peeling member.

  As shown in FIGS. 3 and 6, in the central part separation path 75 b, the casting film 27 is conveyed in a state where the central part 27 a sticks to the band 57 and the ear part 27 b is not in contact with the traveling support body 52. Therefore, in order to support the ear part 27b of the casting film 27, it is preferable to provide the ear part support rollers 92 on both sides of the central part separation path 75b. In addition to the ear support roller 92, a center support roller that supports the center 72a may be provided in the center separation path 75b. The temperature of the ear support roller 92 is adjusted by a temperature controller (not shown) so as to be substantially constant within a predetermined range (−10 ° C. or more and 5 ° C. or less). When the ear support roller 92 and the center support roller are used in combination, the temperature of the ear support roller 92 is preferably lower than the temperature of the center support roller. The temperature difference between the support rollers is preferably 0 ° C. or more and 5 ° C. or less.

  In addition, it is preferable to provide a temperature adjustment roller 94 that adjusts the temperature of the band 57 that passes through the central return path 75c. A temperature controller (not shown) adjusts the temperature of the temperature adjusting roller 94 so as to be substantially constant within a predetermined range (−15 ° C. to 0 ° C.).

  Instead of at least one of the ear support roller 92, the center support roller, and the temperature adjustment roller 94, a cooling air supply device that applies cooling air having a temperature in a predetermined range to the band 57 may be provided. These rollers and the cooling air supply device may be used in combination.

  It is preferable to provide a decompression chamber 99 on the upstream side of the casting die 51 in the traveling direction of the traveling support 52. The decompression chamber 99 has a rear plate provided in the direction A (see FIG. 4), and a pair of side plates that block between the casting die 51 and the rear plate, and the casting die 51, the rear plate, and the pair of side plates Aspirate the air in the enclosed vacuum zone. With the suction of air in the decompression zone, the accompanying wind flowing toward the vicinity of the bead can be blocked. A jacket (not shown) is attached to the rear plate and the side plate. And the temperature of a back board or a side board can be adjusted in a predetermined range by supplying the heat transfer medium in which the temperature was adjusted in the predetermined range to this jacket.

  The web manufacturing chamber 31 is provided with a temperature control device, a condenser, and a recovery device (not shown). The temperature control device adjusts the temperature of the atmosphere in the web manufacturing chamber 31 to be substantially constant within a predetermined range. The capacitor liquefies the solvent that exists as a gas in the web manufacturing chamber 31. The solvent liquefied by the condenser is recovered by a recovery device (not shown). The condensation point of the solvent in the atmosphere in the web manufacturing chamber 31 can be adjusted by the capacitor.

  Next, the operation of the present invention will be described. As shown in FIG.1 and FIG.2, in the optical film manufacturing equipment 30, the optical film manufacturing method 10 is performed. In the web manufacturing room 31, the web manufacturing process 13 is performed, and the wet film 12 is made from the dope 11. Details of the web manufacturing process 13 will be described later. The wet film 12 is subjected to a drying step 15 in the clip tenter 33 and the drying chamber 34 to become an optical film 14. The optical film 14 is wound around the winding core 48 in the winding chamber 32.

(Web manufacturing process)
Next, the details of the web manufacturing process 13 will be described. As shown in FIGS. 3, 6, and 8, in the web manufacturing chamber 31, the ear support surface 61 travels endlessly on the ear travel path 71, and the center support surface 65 travels on the center travel path 75. 80 runs endlessly on the pin travel path 85. Although the traveling speed of the ear | edge part support surface 61, the center part support surface 65, and the pin 80 is not specifically limited, For example, it is preferable that they are 50 m / min or more and 200 m / min or less.

(Film formation process)
The casting die 51 continuously discharges the dope 11 onto the traveling support body 52. The discharged dope 11 forms a bead. Thus, as shown in FIGS. 3 and 9, the casting film 27 is formed on the traveling support body 52 from the discharged dope 11. In the cast film 27, the polymer molecules contained in the dope 11 are isotropically oriented. Of the casting film 27, the ear part 27 b is supported by the ear part support surface 61, and the center part 27 a between the pair of both side edges is supported by the center part support surface 65. In the A direction, the length of the ear portion 27b is preferably 0.0025 to 0.01 times the length of the casting film 27, respectively. Due to the contact with the traveling support 52, the casting film 27 is cooled between the position Pb and the position Pc, and the dope 11 forming the casting film 27 is gelled. Here, the gelation of the dope means a state in which the fluidity is lost while the solvent is retained in the polymer molecular chain, and as a result, the fluidity of the dope is lost.

  The decompression chamber 99 sucks air in the decompression zone. Thereby, the downstream side of the bead can be decompressed in the traveling direction of the traveling support body 52. The pressure difference between the upstream side and the downstream side of the bead is preferably 10 Pa or more and 2000 Pa or less.

(Ear part peeling process)
At the position Pc, only the ear part 27 b is peeled from the ear part support surface 61. The casting film 27 from which only the ear portion 27b has been peeled is sent to the position Pd while the central portion 27a is stuck to the band 57. It is preferable that the residual solvent amount of the casting film 27 is 70% by weight or more and 75% by weight or less in the ear part peeling step.

  The amount of residual solvent in the film is {(xy) / y when the sample film is collected from the target film, the weight of the sample film at the time of collection is x, and the weight after the sample film is dried is y. } × 100.

(Ear gripping process)
At the position Pd, as shown in FIG. 3, as a result of the biting brush 88, the ear portion 27 b of the casting film 27 with the central portion 27 a stuck to the band 57 is pressed against the pin 80 (see FIG. 7). The pin 80 traveling on the pin travel path 85 penetrates the ear portion 27b. Thus, the casting film 27 is sent to the position Pe by the traveling pin 80 and the band 57 by the penetration of the pin 80 into the ear portion 27b.

(Center peeling process)
At the position Pe, as shown in FIG. 7, the central portion 27 a of the casting film 27 is peeled from the band 57 while the ear portion 27 b is penetrated by the pin 80. It is preferable that the residual solvent amount of the casting film 27 is 70 wt% or more and 75 wt% or less in the center portion holding step. The casting film 27 becomes the wet film 12 by the center peeling process.

  Returning to FIG. 3, between the position Pe and the position Pf, the wet film 12 is conveyed in a state where the ear portion 27b is held by the pin 80, and the temperature of the wet film 12 is adjusted to be within a predetermined range. The At the position Pf, the gripping of the ear portion 27b by the pin 80 is released. The residual solvent amount of the wet film 12 at the position Pf is preferably 2% by weight or more and 7% by weight or less. The wet film 12 from which the gripping of the ear portion 27b is released is sent out from the web manufacturing chamber 31 toward each device provided on the downstream side.

  As shown in FIG. 10, although the orientation of polymer molecules in the cast film 27 formed in the web manufacturing chamber 31 is extremely low, the thickness unevenness Δd (≦ 0.2 μm) still remains. This uneven thickness is composed of thick portions 100 a and thin portions 100 b that are alternately arranged in the longitudinal direction of the casting film 27, that is, in the traveling direction of the traveling support 52.

  When the casting film 27 is peeled off from the traveling support 52 at a time to form the wet film 12, a peeling tension is applied to the casting film 27, and polymer molecules are peeled off in the wet film 12 by the peeling tension. Orient in the direction of tension. And when the thickness dispersion | variation has arisen in the casting film 27, the degree of the orientation of a polymer molecule | numerator is large compared with the thin part in the wet film 12 peeled off from the traveling support body 52 at once.

  Further, regarding the wet film 12 introduced into the pin tenter 53, when the residual solvent amount is 20 wt% or more and 30 wt% or less and the temperature Tf is 110 ° C. or more, crystallization of the polymer occurs. And when crystallization of a polymer occurs, in-plane retardation Re will fall. Also, polymer crystallization becomes more prominent as the degree of orientation of the polymer molecules increases. Therefore, when the wet film 12 in which the orientation of polymer molecules varies is introduced into the pin tenter 53, the amount of decrease in the in-plane retardation Re increases as the degree of orientation of the polymer molecules increases, resulting in uneven optical characteristics. Will occur.

  As described above, when the wet film 12 peeled off from the traveling support body 52 at one time is introduced into the pin tenter 53, the thick part of the casting film 27 is in-plane retardation Re compared to the thin part of the casting film 27. As a result, the in-plane retardation Re of the wet film 12 varies.

  In the present invention, the casting film 27 is peeled off from the support on the ears 27b that are not used in the product, and then on the central part 27a that is the product. Further, after the ear portion 27 b is peeled off and before the central portion 27 a is peeled off, the ear portion 27 b is gripped by the pin tenter 53. As described above, in the present invention, since the central portion 27a is peeled in the state where the ear portion 27b is gripped, when the central portion 27a is peeled off, almost no peeling tension is applied to the central portion 27a. The occurrence of optical unevenness due to the peeling tension can be suppressed. Further, when the ear portion 27b is peeled off, the ear portion 27b is peeled off, but the ear portion 27b is not used in the product, so that there is no influence of optical unevenness on the film. Therefore, according to the present invention, since the casting film 27 can be peeled off from the support without applying the peeling tension to the central portion 27a as a product, a film having excellent optical characteristics can be produced. .

  In the above embodiment, one cooling drum 56 is used as a support for supporting the ears 27b of the casting film 27. However, the present invention is not limited to this, and as shown in FIG. May be used. And as a support body which supports the center part 27a of the casting film 27, you may use the band 57 wound around the two cooling drums 56 and the rotating roller 54. FIG. Further, ear support rollers 92 may be provided on both sides of the traveling path of the band 57 between the cooling drum 56 and the cooling drum 110.

  The present invention is not limited to the optical film manufacturing method 10 shown in FIG. 1, and may be the optical film manufacturing method 120 shown in FIG. The optical film manufacturing method 120 includes a web manufacturing process 123 and a drying process 15. In the web manufacturing process 123, the film forming process 22, the center peeling process 25, and the ear peeling process 23 are sequentially performed. Note that the ear gripping step 24 may be performed after the ear stripping step 23.

  As shown in FIG. 13, the web manufacturing chamber 131 includes a casting die 51, a travel support 152, a rotating roller 54, and a peeling roller 158. The travel support 152 includes a cooling drum 156 and two bands 157. In addition, when performing the ear | edge part holding process 24, you may provide the pin tenter 53 in the web manufacturing chamber 131 or between the web manufacturing chamber 131 and the clip tenter 33 (refer FIG. 2).

  As shown in FIGS. 14 and 15, a central support surface 165 is formed at the center in the A direction on the peripheral surface of the cooling drum 156, and bands on both sides of the central support surface 165 in the A direction. A groove 162 serving as a traveling path 157 is provided.

  The band 157 and the groove 162 are formed so as to be flush with each other when the band 157 is stretched over the groove 162. In this manner, the band 157 is passed over the groove 162 and the rotating roller 54 provided on the cooling drum 156, thereby forming the ear support surface 161 and the center support surface 165 formed on the surface of the band 157. 27 is provided on the traveling support body 152.

(Web manufacturing process)
Next, an outline of the web manufacturing process 123 (see FIG. 12) performed in the web manufacturing room 131 will be described. When the cooling drum 156 rotates around the shaft under a control unit (not shown), the band 157 stretched over the cooling drum 156 and the rotating roller 54 travels endlessly. Thereby, the ear | edge part support surface 161 and the center part support surface 165 drive | work an endless endlessly.

(Film formation process)
The casting die 51 discharges the dope 11 onto the traveling support body 152. The discharged dope 11 forms a bead. At the position Pb, the casting film 27 made of the dope 11 is formed on the traveling support body 52. Of the casting film 27, the ear part 27 b is supported by the ear part support surface 161, and the center part 27 a is supported by the center part support surface 165. Due to the contact with the traveling support 152, the casting film 27 is cooled between the position Pb and the position Pe, and the dope 11 forming the casting film 27 is gelled.

(Center peeling process)
At the position Pe, the central portion 27a of the casting film 27 is peeled from the central support surface 165 while the ear portion 27b is supported by the ear support surface 161.

(Ear part peeling process)
At the position Pc, the peeling part 158 peels the ear part 27 b from the ear part supporting surface 161. Thus, the cast film 27 peeled from the traveling support 152 becomes the wet film 12 and is sent out from the web manufacturing chamber 131.

  Note that the nip roller 169 may be provided in the vicinity of the position Pe. Since the ear portion 27b in the vicinity of the position Pe is sandwiched between the nip roller 169 and the band 157, the center portion peeling step can be performed while suppressing the peeling tension applied to the center portion 27a.

  In the ear part peeling step 23, the pair of ear parts 27b may be peeled off at the same time, or one of the ear parts 27b may be peeled off before the other ear part 27b.

  In the said embodiment, although the ear | edge part peeling process 24 was performed in the position Pc, this invention is not restricted to this, It replaces with the ear | edge part peeling process 24, and performs the ear cutting process which separates the ear | edge part 27b from the casting film 27. Also good. The position where the ear-cutting process is performed may be any position between the position Pe and the position Pc. When the ear-cutting process is performed, it is preferable to provide an ear-cut device 37 (see FIG. 2) between the position Pe and the position Pc.

  In the above embodiment, the traveling support body is configured from the band and the cooling drum. However, the present invention is not limited to this, and the traveling support body may be configured from only a plurality of bands or only the plurality of cooling drums. In the case where the traveling support body is composed of only a plurality of bands, for example, a pair of ear support bands that support the ear portions 27b and the ear support bands are provided to support the central portion 27a. The running support can be configured by passing the center support band over the rotating roller.

  In the above-described embodiment, the method of continuously performing each of the steps 22 to 25 is used. However, the present invention is not limited to this, and a method of performing each of the steps 22 to 25 one by one (hereinafter referred to as an offline method) is used. Good.

  Next, the offline method of the web manufacturing process 13 (see FIG. 1) will be described. As shown in FIG. 16A, the support 170 includes a center support 170a and a pair of ear supports 170b provided on both sides of the center support 170a. A dope 11 (see FIG. 1) is applied to the support 170 to form a film 171 on the support 170. Second, the ear support 170b is peeled from the film 171 (see FIG. 16B). Third, the center support 170a is peeled from the membrane 171 in a state where the ear 171b is gripped using the gripping member 172 (see FIG. 16C). In this manner, the film 171 can be peeled from the support 170 while suppressing the peeling tension applied to the central portion 171a as much as possible.

  Next, an offline method of the web manufacturing process 123 (see FIG. 12) will be described. First, the dope 11 (see FIG. 12) is applied to the support 170 to form a film 171 on the support 170 (see FIG. 17A). Second, the ear 171b of the membrane 171 is gripped by the ear support 170b and the gripping member 172 (see FIG. 17B). Third, the center support 170a is peeled from the membrane 171 while the ear 171b is gripped (see FIGS. 17C and 17D). Fourth, the ear support 170b is peeled from the ear 171b using a peeling member such as a scraper roller. In this manner, the film 171 can be peeled from the support 170 while suppressing the peeling tension applied to the central portion 171a as much as possible.

  In the above embodiment, the ear support 170b is peeled from the ear 171b using a peeling member such as a scraper roller. However, the present invention is not limited to this, and the ear 171b may be separated from the film 171. Thereby, the film | membrane 171 can be peeled from the support body 170, suppressing the peeling tension concerning the center part 171a as much as possible.

  In the said embodiment, although the ear | edge part peeling process was performed so that an ear | edge part may distance from the ear | edge part support body in the thickness direction of a casting film, this invention is not limited to this, and an ear | edge part is A from an ear | edge part support body. You may perform an ear | edge part peeling process so that it may distance in a direction.

(Cellulose acylate)
As the cellulose acylate, triacetyl cellulose (TAC) is particularly preferable. Of the cellulose acylates, those in which the hydroxyl group of cellulose is esterified with a carboxylic acid, that is, the substitution degree of the acyl group satisfies all of the following formulas (I) to (III) are more preferable. In the following formulas (I) to (III), A and B represent the substitution degree of the acyl group, A is the substitution degree of the acetyl group, and B is the substitution degree of the acyl group having 3 to 22 carbon atoms. It is. In addition, it is preferable that 90 weight% or more of TAC is a particle | grain of 0.1 mm-4 mm.
(I) 2.5 ≦ A + B ≦ 3.0
(II) 0 ≦ A ≦ 3.0
(III) 0 ≦ B ≦ 2.9

  Glucose units having β-1,4 bonds constituting cellulose have free hydroxyl groups at the 2nd, 3rd and 6th positions. Cellulose acylate is a polymer obtained by esterifying some or all of these hydroxyl groups with an acyl group having 2 or more carbon atoms. The degree of acyl substitution means the ratio of the hydroxyl group of cellulose esterified at each of the 2-position, 3-position and 6-position (100% esterification has a substitution degree of 1).

  The total acylation substitution degree, that is, DS2 + DS3 + DS6 is preferably 2.00 to 3.00, more preferably 2.22 to 2.90, and particularly preferably 2.40 to 2.88. Further, DS6 / (DS2 + DS3 + DS6) is preferably 0.28 or more, more preferably 0.30 or more, and particularly preferably 0.31 to 0.34. Here, DS2 is the degree of substitution of the hydroxyl group at the 2-position of the glucose unit with an acyl group (hereinafter also referred to as “degree of acyl substitution at the 2-position”), and DS3 is the degree of substitution of the hydroxyl group at the 3-position with an acyl group (hereinafter, referred to as “acyl group”). DS6 is the substitution degree of the hydroxyl group at the 6-position with an acyl group (hereinafter also referred to as “acyl substitution degree at the 6-position”).

  Only one type of acyl group may be used in the cellulose acylate of the present invention, or two or more types of acyl groups may be used. When two or more kinds of acyl groups are used, it is preferable that one of them is an acetyl group. When the sum of the substitution degrees by the hydroxyl groups at the 2nd, 3rd and 6th positions is DSA, and the sum of the substitution degree by an acyl group other than the acetyl group at the 2nd, 3rd and 6th hydroxyl groups is DSB, the value of DSA + DSB is More preferably, it is 2.22 to 2.90, and particularly preferably 2.40 to 2.88. The DSB is 0.30 or more, particularly preferably 0.7 or more. Further, 20% or more of DSB is a substituent at the 6-position hydroxyl group, more preferably 25% or more is a substituent at the 6-position hydroxyl group, more preferably 30% or more, and particularly 33% or more is a 6-position hydroxyl group. It is preferable that it is a substituent. Furthermore, the cellulose acylate having a substitution degree of 6-position of cellulose acylate of 0.75 or more, further 0.80 or more, and particularly 0.85 or more can be mentioned. With these cellulose acylates, a solution having a preferable solubility (dope) can be produced. In particular, a good solution can be prepared in a non-chlorine organic solvent. Furthermore, it is possible to produce a solution having a low viscosity and good filterability.

  Cellulose, which is a raw material for cellulose acylate, may be obtained from either linter or pulp.

  The acyl group having 2 or more carbon atoms of the cellulose acylate of the present invention may be an aliphatic group or an aryl group and is not particularly limited. These are, for example, cellulose alkylcarbonyl esters, alkenylcarbonyl esters, aromatic carbonyl esters, aromatic alkylcarbonyl esters, and the like, each of which may further have a substituted group. Preferred examples of these include propionyl, butanoyl, pentanoyl, hexanoyl, octanoyl, decanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl, iso-butanoyl, t-butanoyl, cyclohexanecarbonyl, oleoyl, benzoyl , Naphthylcarbonyl, cinnamoyl group and the like. Among these, propionyl, butanoyl, dodecanoyl, octadecanoyl, t-butanoyl, oleoyl, benzoyl, naphthylcarbonyl, cinnamoyl and the like are more preferable, and propionyl and butanoyl are particularly preferable.

(solvent)
Solvents for preparing the dope include aromatic hydrocarbons (eg, benzene, toluene, etc.), halogenated hydrocarbons (eg, dichloromethane, chlorobenzene, etc.), alcohols (eg, methanol, ethanol, n-propanol, n-butanol, Diethylene glycol, etc.), ketones (eg, acetone, methyl ethyl ketone, etc.), esters (eg, methyl acetate, ethyl acetate, propyl acetate, etc.) and ethers (eg, tetrahydrofuran, methyl cellosolve, etc.). In the present invention, the dope means a polymer solution or dispersion obtained by dissolving or dispersing a polymer in a solvent.

  Among these, halogenated hydrocarbons having 1 to 7 carbon atoms are preferably used, and dichloromethane is most preferably used. One kind of alcohol having 1 to 5 carbon atoms in addition to dichloromethane from the viewpoint of physical properties such as solubility of TAC, peelability of cast film from the support, mechanical strength of the film, and optical properties of the film It is preferable to mix several kinds. The content of the alcohol is preferably 2% by weight to 25% by weight and more preferably 5% by weight to 20% by weight with respect to the whole solvent. Specific examples of the alcohol include methanol, ethanol, n-propanol, isopropanol, n-butanol and the like, but methanol, ethanol, n-butanol or a mixture thereof is preferably used.

  By the way, recently, for the purpose of minimizing the influence on the environment, studies have been conducted on the solvent composition when dichloromethane is not used. For this purpose, ethers having 4 to 12 carbon atoms, carbon atoms A ketone having 3 to 12 carbon atoms, an ester having 3 to 12 carbon atoms, and an alcohol having 1 to 12 carbon atoms are preferably used. These may be used in combination as appropriate. For example, a mixed solvent of methyl acetate, acetone, ethanol, and n-butanol can be mentioned. These ethers, ketones, esters and alcohols may have a cyclic structure. A compound having two or more functional groups of ether, ketone, ester, and alcohol (that is, —O—, —CO—, —COO—, and —OH) can also be used as the solvent.

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

(Use)
The polymer film of the present invention is useful as a polarizing plate protective film or a retardation film. An optically anisotropic layer, an antireflection layer, an antiglare function layer and the like may be added to the polymer film to form a high function film.

  When used as a retardation film, the in-plane retardation Re is preferably 30 nm to 100 nm, and the thickness direction retardation Rth is preferably 70 nm to 300 nm.

The in-plane retardation Re can be measured as follows. The sample film was conditioned at a temperature of 25 ° C. and a humidity of 60% RH for 2 hours, and the retardation value measured from the vertical direction at 632.8 nm with an automatic birefringence meter (KOBRA21DH Oji Scientific Co., Ltd.) was used. Re is expressed by the following equation.
Re = | nA−nB | × d
nA represents the refractive index in the A direction, and nB represents the refractive index in the longitudinal direction of the optical film 14.

The thickness direction retardation Rth can be measured as follows. The sample film was conditioned for 2 hours at a temperature of 25 ° C. and a humidity of 60% RH, and the value measured from the vertical direction at 589.3 nm with an automatic birefringence meter (KOBRA21DH Oji Scientific Co., Ltd.) and tilting the film surface It calculates according to a following formula from the extrapolated value of the retardation value measured similarly.
Rth = {(nA + nB) / 2−nC} × d
nC represents the refractive index in the thickness direction.

  In the above embodiment, the wet film is manufactured from the dope. However, the present invention is not limited to this, and after the liquid is applied to the support, the film made of the liquid is peeled off from the support. it can. Moreover, what is necessary is just to use what becomes a raw material of a web as a polymer. An example of such a web is a photographic film.

(Experiment 1)
In the web manufacturing chamber 31 shown in FIG. 3, a web manufacturing process (see FIG. 1) is performed to form a casting film 27 from the dope 11, and the casting film 27 is peeled off from the running support 52 to remove the wet film 12. Obtained. Thereafter, the wet film 12 was dried in the clip tenter 33 and the drying chamber 34 to obtain the optical film 14. The film forming speed Vz of the wet film 12 in the web manufacturing room 31 was 50 m / min.

The thickness unevenness Δd of the cast film 27 formed on the travel support 52 was 0.2 μm. Here, the thickness unevenness Δd is represented by (d _max −d _min ). d _max is the maximum of the measured values of the thickness of the cast film 27 obtained by the laser film thickness meter, and d _min is the minimum of the measured values of the thickness of the cast film 27. .

In addition, the stretch ratio ER _MD of the wet film 12 before and after peeling from the traveling support 52 was 117%. Here, the stretch ratio ER _MD is obtained by dividing the length in the longitudinal direction of the wet film 12 after peeling off by the length in the longitudinal direction of the wet film 12 before peeling off. Furthermore, the temperature Tf of the wet film 12 conveyed by the pin tenter 53 was 80 ° C.

(Experiments 2-12)
An optical film 14 was produced in the same manner as in Experiment 1 except that the type of the web production room, the film forming speed Vz, the stretching ratio ER _MD , and the temperature Tf were set to the values shown in Table 1. In Table 1, when the web manufacturing process is performed in the web manufacturing room 31, the type of the web manufacturing room is “FIG. 3”, and when performed in the web manufacturing room 111, the type of the web manufacturing room is “figure”. 11 ”and the web manufacturing room 131, the type of the web manufacturing room is represented as“ FIG. 13 ”, respectively.

(Comparative Experiment 1)
As the running support, a cooling drum was used which lay so that the axial direction was horizontal. And dope was discharged to the surrounding surface of the cooling drum rotated centering on an axis | shaft, and the casting film was formed on the surrounding surface. The cast film was peeled off from the support using a peeling roller. The casting film from the support was peeled off at the ear and at the center at the same time.

(Comparative Experiments 2-3)
An optical film 14 was produced in the same manner as in Comparative Experiment 1 except that the film forming speed Vz, the stretching ratio ER _MD , and the temperature Tf were set to values shown in Table 1.

  About each optical film 14 obtained by Experiment 1-12 and Comparative Experiment 1-3, the presence or absence of an optical nonuniformity was evaluated.

(Evaluation of optical unevenness)
Twenty sample films were equally cut in the A direction, and the in-plane retardation Re of each sample film was measured. Next, ΔRe was calculated from the measured values of each retardation. Here, if the maximum value of Re measured values is Re _max and the minimum value is Re _min , ΔRe is represented by (Re _max −Re _min ). Then, using this ΔRe as an index, the presence or absence of optical unevenness was evaluated based on the following criteria.
A: ΔRe is within 0.1 nm.
○: ΔRe is larger than 0.1 nm and within 0.2 nm.
Δ: ΔRe is larger than 0.2 nm and within 0.3 nm.
X: ΔRe is larger than 0.3 nm.

For Experiments 1-12 and Comparative Experiments 1-3, the web production room type, film forming speed Vz, stretch ratio ER _MD , temperature Tf, thickness unevenness Δd, ΔRe, and optical unevenness evaluation results are shown in Table 1. .

  From the above results, it was found that according to the present invention, the membrane can be peeled off from the support so that the portion of the film on the support that is to be a product is not peeled off as much as possible.

DESCRIPTION OF SYMBOLS 10 Optical film manufacturing method 11 Dope 12 Wet film 14 Optical film 22 Web manufacturing process 23 Ear part peeling process 24 Ear part holding process 25 Center part peeling process 27 Casting film 27a Center part 27b Ear part 30 Optical film manufacturing equipment 31 Web manufacture Chamber 51 Casting die 52 Traveling support 53 Pin tenter 54 Rotating roller 56 Cooling drum 57 Band 61 Ear support surface 62 Groove 65 Central support surface 71 Ear travel path 75 Central travel path 75a Central parallel travel path 75b Central part separation Road 75c Center return path 80 Pin 85 Pin travel path 85a Pin parallel path 85b Pin separation path 85c Pin return path

Claims (10)

A film forming step of discharging a dope containing a polymer and a solvent to a support and forming a film made of the dope on the support;
An ear gripping step of gripping the ears at both ends of the membrane using a gripping member;
Of the film in which the ears are gripped, a center part peeling step for peeling the center part between the ears from the support,
Having an ear peeling step for peeling the ear from the support,
Features and to roux E blanking production process to make the ears peeling step prior to the ears gripping step. The web manufacturing method according to claim 1, wherein in the center part peeling step, the ear part is gripped using a plurality of gripping members. Using the method of web manufacturing according to claim 1 or 2, after peeling off the film from the support, method for producing an optical film, which comprises drying the membrane. 4. The method for producing an optical film according to claim 3, wherein in the film formation step, the film is cooled such that the dope forming the film is gelled. A discharge section for discharging a dope containing a polymer and a solvent;
A support for forming a film made of the discharged dope;
A peeling portion for peeling the film from the support;
A gripping member that grips the ears at both ends of the membrane as a pair and a transporting unit that includes a gripping member traveling path on which the gripping member travels;
The support includes an ear support that supports the ear, and a center support that supports a center between the ears of the membrane,
The peeling part includes a central part peeling mechanism for peeling the central part from the central part support body and an ear part peeling mechanism for peeling the ear part from the ear part support body,
The ear support and the center support travel,
The ear part peeling mechanism and the center part peeling mechanism are arranged so as to line up in the running direction of the center part support body or the ear part support body,
The ear peeling mechanism is provided on the upstream side in the traveling direction of the central support body than the central peeling mechanism,
The gripping member traveling path is provided from the upstream side to the downstream side of the central part peeling mechanism in the traveling direction of the central part support.
Wherein the said gripping member traveling path on the upstream side of the central portion peeling mechanism, U E blanking manufacturing apparatus characterized by gripping starting unit to start gripping the ears by the gripping member. A discharge section for discharging a dope containing a polymer and a solvent;
A support for forming a film made of the discharged dope;
A peeling portion for peeling the film from the support;
A gripping member that grips the ears at both ends of the membrane as a pair and a transporting unit that includes a gripping member traveling path on which the gripping member travels ;
The support includes an ear support that supports the ear, and a center support that supports a center between the ears of the membrane,
The peeling part includes a central part peeling mechanism for peeling the central part from the central part support body and an ear part peeling mechanism for peeling the ear part from the ear part support body,
The ear support and the center support travel,
The ear part peeling mechanism and the center part peeling mechanism are arranged so as to line up in the running direction of the center part support body or the ear part support body,
The ear peeling mechanism is composed of a center running path of the center support and an ear running path of the ear support.
The ear part traveling path is provided on both sides of the central part traveling path, the ear part parallel traveling path, and the ear provided on the downstream side of the ear part parallel traveling path and so as to be separated from the central part traveling path. c E Bed manufacturing apparatus characterized by comprising a part peeling channel. The ear peeling mechanism is provided on the upstream side in the traveling direction of the central support body than the central peeling mechanism,
The gripping member traveling path is provided from the upstream side to the downstream side of the central part peeling mechanism in the traveling direction of the central part support.
The web manufacturing apparatus according to claim 6 , wherein a grip start portion for starting gripping of the ear portion by the grip member is provided in the grip member traveling path upstream of the center peeling mechanism. . The central part peeling mechanism is composed of a central part traveling path of the central part support and the gripping member traveling path,
The gripping member traveling path is provided on both sides of the central part traveling path, and on the downstream side of the gripping member traveling path, and is gripped so as to be separated from the central part traveling path. The web manufacturing apparatus according to claim 5 , further comprising a member peeling path. A discharge section for discharging a dope containing a polymer and a solvent;
A support for forming a film made of the discharged dope;
A peeling portion for peeling the film from the support;
A gripping member that grips the ears at both ends of the membrane as a pair and a transporting unit that includes a gripping member traveling path on which the gripping member travels;
The support includes an ear support that supports the ear, and a center support that supports a center between the ears of the membrane,
The peeling part includes a central part peeling mechanism for peeling the central part from the central part support body and an ear part peeling mechanism for peeling the ear part from the ear part support body,
The ear support and the center support travel,
The ear part peeling mechanism and the center part peeling mechanism are arranged so as to line up in the running direction of the center part support body or the ear part support body,
The central part peeling mechanism is composed of a central part traveling path of the central part support and the gripping member traveling path,
The gripping member traveling path is provided on both sides of the central part traveling path, and on the downstream side of the gripping member traveling path, and is gripped so as to be separated from the central part traveling path. c E Bed manufacturing apparatus characterized by having a member peeling passage. The web manufacturing apparatus according to any one of claims 5 to 9 ,
An optical film manufacturing facility, comprising: a drying unit that dries the film peeled from the support.

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