Optical film manufacturing method and manufacturing device

Abstract

[Problem] To provide a method, etc., for manufacturing an optical film, in which curl that occurs in a widthwise end of an optical film is corrected, and it is thereby possible to precisely detect the position of the end of the optical film and to effectively prevent meandering of the optical film. [Solution] The present invention includes: a curl correction step S1 for correcting, through use of a curl correction device 20, a curl C that occurs in a widthwise end of an optical film F1 conveyed in the longitudinal direction thereof; a widthwise end position detection step S2 for detecting, through use of a position detection device 30, the position of the widthwise end of the optical film that has undergone the curl correction step; and a widthwise conveyance position adjustment step S3 for adjusting, through use of a position adjustment device 40, the conveyance position of the optical film in the width direction thereof, on the basis of the position of the widthwise end of the optical film detected by the widthwise end position detection step.

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for producing an optical film, and more particularly to a method and an apparatus for producing an optical film that can accurately detect the position of the edge of the optical film by correcting curls that occur at the edge of the optical film in the width direction, and effectively prevent meandering of the optical film. [Background technology]

[0002] Optical films have conventionally been used in image display devices such as liquid crystal display devices and organic EL display devices. Examples of optical films include polarizers, polarizing films containing polarizers, retardation films, and anti-glare films. Optical films are typically manufactured using long, strip-shaped raw film. Typically, the raw film is conveyed in the longitudinal direction by a conveying device having conveying rollers, and various processes are sequentially performed on the raw film to produce a long, strip-shaped optical film as a product (see, for example, Patent Document 1). The long, strip-shaped optical film is cut into a size and shape appropriate for the application, and is used in image display devices and the like. Hereinafter, in this specification, the term "optical film" refers not only to optical films as finished products, but also to raw films and films in intermediate products.

[0003] In the manufacturing process of the optical film described above, unevenness in the thickness of the optical film or uneven tension in the optical film can cause meandering, which causes fluctuations in the conveying position in the width direction of the optical film. When meandering occurs, deviations occur in the cutting position and cutting angle of the optical film. Therefore, a so-called edge position controller is used, which detects the position of the width direction edge of the optical film using a position detection device and adjusts (controls) the attitude (position, angle, etc.) of the conveying rollers that convey the optical film so that the position is always constant (see, for example, Patent Document 2).

[0004] On the other hand, during the manufacturing process of an optical film, the optical film may curl at its widthwise end due to thermal shrinkage or moisture absorption. For example, a polarizer is manufactured by subjecting a raw film such as a polyvinyl alcohol-based film to a series of treatments, including swelling, dyeing, crosslinking, stretching, and cleaning, and then drying it in a drying device (oven). During drying in this drying device, the polarizer may curl at its widthwise end due to thermal shrinkage.

[0005] When the optical film reaches the position detection device in the curled state described above, the position of the widthwise end of the optical film cannot be detected accurately, and therefore meandering of the optical film may not be effectively prevented. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2018-092186 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-164002 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide a method and apparatus for manufacturing an optical film that can accurately detect the position of the end of the optical film and effectively prevent meandering of the optical film by correcting curl that occurs at the widthwise end of the optical film. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention includes a curl correction step of correcting curls generated at width direction ends of an optical film transported in a longitudinal direction by a curl correction device, a width direction end position detection step of detecting positions of the width direction ends of the optical film that have been subjected to the curl correction step by a position detection device, and a width direction transport position adjustment step of adjusting the width direction transport position of the optical film based on the positions of the width direction ends of the optical film detected by the width direction end position detection step, the curl correction device comprises a shaft portion and a rotating roller attached to the shaft portion and rotatable in contact with an end portion of the width direction of the optical film, the shaft portion being attached so as to be inclined at an angle α with respect to the width direction of the optical film when viewed from the longitudinal direction of the optical film, and being inclined at an angle β toward the upstream side of the conveyance direction of the optical film with respect to the width direction of the optical film when viewed from a direction perpendicular to the film surface of the optical film, the angle α being set to 0°<α≦20°, and the angle β being set to 0°<β≦15°; A method for producing an optical film is provided.

[0009] According to the present invention, since a curl correction step is performed in which curls occurring at the width direction edges of the optical film are corrected by a curl correction device before the width direction edge position detection step is performed, the positions of the width direction edges of the optical film can be detected with high accuracy. Therefore, in the width direction conveyance position adjustment step, the width direction conveyance position of the optical film can be appropriately adjusted, and meandering of the optical film can be effectively prevented. 。 Furthermore, according to the present invention, the curl correction device is equipped with a rotating roller that can rotate in contact with the widthwise end of the optical film, so that the curl can be corrected while the optical film is continuously transported in the longitudinal direction without the curl correction device interfering with the transport of the optical film.

[0016] The present invention is effective when a conveying roller for conveying the optical film, which is located upstream of the position detection device in the conveying direction of the optical film, is more than 1 m upstream of the position detection device in the conveying direction of the optical film.

[0017] When the conveying rollers located upstream in the conveying direction are spaced apart from the position detection device by 1.5 times the width of the optical film, specifically, for example, 1 m or more, the widthwise ends of the optical film are not restrained by the conveying rollers before the optical film reaches the position detection device, which is thought to increase the risk of curling at the widthwise ends of the optical film.Even in such a situation where curling is likely to occur, by applying the present invention, the curl can be corrected and the position of the widthwise ends of the optical film can be detected with high accuracy. Note that "the conveying rollers are... (omitted)... 1 m or more away" means that when there are multiple conveying rollers located upstream of the position detection device in the conveying direction of the optical film, the conveying roller located furthest downstream in the conveying direction among these multiple conveying rollers is 1 m or more away from the position detection device.

[0018] The present invention is also effective in situations where curling of the optical film is likely to occur, for example, when the optical film is a polarizer and the position of the width direction end is detected on the outlet side of a drying device that dries the polarizer. That is, when the optical film is a polarizer, for example, the curl correction device and the position detection device are located on the exit side of a drying device that dries the polarizer.

[0019] In order to solve the above-mentioned problems, the present invention provides a curl correction device that corrects curls generated at width-direction ends of an optical film that is transported in a longitudinal direction, a position detection device that detects the positions of the width-direction ends of the optical film whose curls have been corrected by the curl correction device, and a position adjustment device that adjusts the transport position of the optical film in the width direction based on the positions of the width-direction ends of the optical film detected by the position detection device, the curl correction device comprises a shaft portion and a rotating roller attached to the shaft portion and rotatable in contact with an end portion of the width direction of the optical film, the shaft portion being attached so as to be inclined at an angle α with respect to the width direction of the optical film when viewed from the longitudinal direction of the optical film, and being inclined at an angle β toward the upstream side of the conveyance direction of the optical film with respect to the width direction of the optical film when viewed from a direction perpendicular to the film surface of the optical film, the angle α being set to 0°<α≦20°, and the angle β being set to 0°<β≦15°; It is also provided as an optical film manufacturing device. [Effects of the Invention]

[0020] According to the present invention, by correcting curls occurring at the width direction edges of an optical film, it is possible to accurately detect the positions of the edges of the optical film and effectively prevent meandering of the optical film. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic diagram illustrating an example of the overall configuration of a production facility for a polarizing film obtained from a polarizer produced by a production method according to one embodiment of the present invention. [Figure 2] 2 is a schematic diagram showing an example of a schematic configuration in the vicinity of an edge position controller provided in the manufacturing apparatus shown in FIG. 1. FIG. [Figure 3] FIG. 1 is a flow chart illustrating a schematic procedure of a method for producing a polarizer according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, with reference to the accompanying drawings as appropriate, a method and apparatus for producing an optical film according to one embodiment of the present invention will be described, taking as an example a case where the optical film is a polarizer. It should be noted that the drawings are for reference purposes only, and the dimensions, scale, and shapes of the components shown in the drawings may differ from the actual ones.

[0023] Fig. 1 is a schematic diagram showing an example of the overall configuration of a production facility for polarizing films obtained from polarizers produced by the production method according to this embodiment. The arrows in Fig. 1 indicate the transport direction of each film. When producing polarizing film F using the production equipment shown in FIG. 1, first, raw film F0, such as a polyvinyl alcohol-based film, wound around a feed roller 1 is unwound and immersed in a treatment bath in a treatment tank 2 where it is subjected to various treatments such as dyeing and stretching. Next, the film is dried in a drying device (oven) 3 to obtain polarizer F1. The thickness of polarizer F1 is not particularly limited, but is generally about 1 to 80 μm, preferably 1 to 20 μm. Polarizer F1 may be produced by using a hydrophilic polymer film such as a polyvinyl alcohol-based film as raw film F0 and subjecting it to various treatments, or by using a hydrophilic polymer film such as a polyvinyl alcohol-based film laminated on a substrate made of a non-hydrophilic polymer film such as a polyethylene terephthalate film as raw film F0 and subjecting it to various treatments.

[0024] The treatment tank 2 includes, for example, a swelling treatment tank, a dyeing treatment tank, a crosslinking treatment tank, a stretching treatment tank, and a washing treatment tank, all of which are not shown, in this order from the upstream side in the transport direction of the raw film F0. In the swelling treatment tank, the raw film F0 is subjected to a swelling treatment. For example, water is used as the treatment bath in the swelling treatment tank. By immersing the raw film F0 in the treatment bath in the swelling treatment tank, the raw film F0 can be cleaned, and swelling the raw film F0 is expected to prevent unevenness such as uneven dyeing. Glycerin, potassium iodide, etc. may be added to the treatment bath as appropriate. The temperature of the treatment bath is preferably 20 to 45°C, more preferably 25 to 40°C. The immersion time of the raw film F0 in the treatment bath is preferably 2 to 180 seconds, more preferably 10 to 150 seconds, and particularly preferably 60 to 120 seconds. The raw film F0 may be stretched in the treatment bath in the swelling treatment tank, with the stretch ratio being approximately 1.1 to 3.5, including the extension due to swelling.

[0025] In the dyeing treatment tank, the raw film F0 that has been subjected to the swelling treatment is subjected to a dyeing treatment. The treatment bath in the dyeing treatment tank is, for example, a solution in which a dichroic substance such as iodine is dissolved in a solvent. Water is generally used as the solvent, but a water-compatible organic solvent may also be added. The raw film F0 is immersed in the treatment bath in the dyeing treatment tank, whereby the dichroic substance is adsorbed onto the raw film F0. The temperature of the treatment bath is preferably 5 to 42°C, more preferably 10 to 35°C. The immersion time of the raw film F0 in the treatment bath is preferably 1 to 20 minutes, more preferably 2 to 10 minutes. The raw film F0 may be stretched in the treatment bath in the dyeing treatment tank, with the cumulative total stretch ratio being approximately 1.1 to 4.0.

[0026] In the crosslinking treatment tank, the dyed raw film F0 is subjected to a crosslinking treatment. The treatment bath in the crosslinking treatment tank is, for example, a solution in which a crosslinking agent such as boric acid is dissolved in a solvent. Water is generally used as the solvent, but a water-compatible organic solvent may also be added. The raw film F0 is immersed in the treatment bath in the crosslinking treatment tank, whereby the raw film F0 is crosslinked. The temperature of the treatment bath is typically 20 to 70°C. The immersion time of the raw film F0 in the treatment bath is typically 1 second to 15 minutes, preferably 5 seconds to 10 minutes. The raw film F0 may be stretched in the treatment bath in the crosslinking treatment tank, with the cumulative total stretch ratio being approximately 1.1 to 4.0 times.

[0027] In the stretching bath, the raw film F0 that has been subjected to the crosslinking treatment is stretched. The treatment bath in the stretching bath is, for example, a solution containing various metal salts or compounds of iodine, boron, or zinc. Water, ethanol, or various organic solvents are appropriately used as the solvent. While the raw film F0 is immersed in the treatment bath in the stretching bath, the raw film F0 is stretched so that the cumulative total stretch ratio is approximately 2 to 7 times. The temperature of the treatment bath is preferably 40 to 67°C, more preferably 50 to 62°C.

[0028] In the washing treatment tank, the raw film F0 that has been subjected to the stretching treatment is subjected to a washing treatment. The treatment bath in the washing treatment tank is, for example, an aqueous solution to which an iodide such as sodium iodide or potassium iodide has been added. The raw film F0 is immersed in the treatment bath in the washing treatment tank, whereby the raw film F0 is washed (washed with water). The temperature of the treatment bath is preferably 10 to 60°C, and more preferably 15 to 40°C.

[0029] Next, in the example shown in FIG. 1 , an active energy ray-curable adhesive is applied to both surfaces of the polarizer F1 using a gravure coater 6. Then, a protective film F2 fed from a feed roller 5 is bonded to both surfaces of the polarizer F1 coated with the active energy ray-curable adhesive using a laminating roller 7. Next, the active energy ray-curable adhesive is cured using an active energy ray irradiation device 8, and then dried in a drying device (oven) 9. Finally, a surface protective film F3 fed from a feed roller 10 is bonded to one surface of the polarizer F1 with the protective films F2 bonded to both surfaces using a laminating roller 11, thereby obtaining a polarizing film F. The obtained polarizing film F is taken up by a take-up roller 12.

[0030] The manufacturing apparatus 200 for the polarizer F1 in this embodiment includes the feed roller 1, the treatment tank 2, and the drying device 3 from the manufacturing equipment described above, and an edge position controller 100 arranged on the exit side of the drying device 3.

[0031] 2A and 2B are schematic diagrams showing an example of a schematic configuration in the vicinity of an edge position controller 100 provided in a manufacturing apparatus 200. Fig. 2A is a front view. Fig. 2B is a plan view seen from the direction of arrow A in Fig. 2A (the longitudinal direction of the polarizer F1). Fig. 2C is a side view seen from the direction of arrow B in Fig. 2A (the normal direction to the film surface of the polarizer F1). As shown in FIG. 2, the edge position controller 100 includes a curl correction device 20, a position detection device 30, and a position adjustment device .

[0032] The curl correction device 20 is a device that corrects curls C that occur at the width direction ends of the polarizer F1 that is transported in the longitudinal direction. The curl correction device 20 of this embodiment includes a rotating roller 21 that is rotatable in contact with an end of the polarizer F1 in the width direction (the direction perpendicular to the longitudinal direction). Specifically, the curl correction device 20 includes a shaft 22 and the rotating roller 21 attached to the shaft 22 via a bearing (not shown). The rotating roller 21 is rotatable in the θ direction shown in FIG. 2(a) as the polarizer F1 is transported in the longitudinal direction. The curl straightening device 20 having the above configuration can straighten the curl C while continuously transporting the polarizer F1 in the longitudinal direction without interfering with the transport of the polarizer F1 by the curl straightening device 20. However, the present invention is not necessarily limited to this, and it is also possible to use a curl straightening device that does not include the rotating roller 21 (does not have a rotatable part) as long as it has a configuration that can straighten the curl C of the polarizer F1.

[0033] The curl correction device 20 of this embodiment is located within 1 m upstream of the position detection device 30 in the transport direction of the polarizer F1. In particular, the curl correction device 20 of this embodiment is attached to the position detection device 30. Specifically, a shaft portion 22 of the curl correction device 20 is attached to the position detection device 30 (a portion of the position detection device 30 facing the upstream side of the transport direction of the polarizer F1) by an attachment jig 23. In this embodiment, the distance between the curl correction device 20 and the position detection device 30 (the distance in the conveying direction of the polarizer F1) is short, so there is no risk of curl C reoccurring at the widthwise end of the polarizer F1 by the time the polarizer F1, whose curl C has been corrected by the curl correction device 20, reaches the position detection device 30, and the position of the widthwise end of the polarizer F1 can be detected more accurately.

[0034] As shown in Fig. 2(b), the shaft 22 of the curl correction device 20 of this embodiment is tilted at an angle α toward the direction in which a predictable curl C will occur (to the right in the example shown in Fig. 2(b)) with respect to the width direction of the polarizer F1 (the vertical direction in Fig. 2(b)) when viewed from the longitudinal direction of the polarizer F1. As shown in Fig. 2(c), the shaft 22 of the curl correction device 20 of this embodiment is tilted at an angle β toward the upstream side in the transport direction of the polarizer F1 (the upper side in Fig. 2(b)) with respect to the width direction of the polarizer F1 (the horizontal direction in Fig. 2(b)) when viewed from a direction perpendicular to the film surface of the polarizer F1. Preferably, the angle α is set to 0°≦α≦20°, and the angle β is set to 0°≦β≦15°.

[0035] Although it is possible to mount the shaft 22 and thus the rotating roller 21 parallel to the width direction of the polarizer F1 (setting α = β = 0°), it is preferable to mount them tilted by the angles α and β (α > 0°, β > 0°) as described above, as this makes it easier to effectively correct only the curl C. That is, mounting them tilted by the angle α (α > 0°) increases the likelihood that the rotating roller 21 will come into contact with only the curl C, making it possible to avoid damage due to friction to the end of the polarizer F1 where no curl C has occurred. Furthermore, mounting them tilted by the angle β (β > 0°) makes it easier for the rotating roller 21 to apply a force directed outward in the width direction of the polarizer F1 to the curl C, making it easier to restore the curl C that has been bent inward in the width direction of the polarizer F1.

[0036] The position detection device 30 is located downstream of the curl correction device 20 in the transport direction of the polarizer F1, and is a device that detects the position of the width direction end of the polarizer F1 whose curl C has been corrected by the curl correction device 20. As the position detection device 30 of this embodiment, for example, an ultrasonic position detection device is used. Specifically, the position detection device 30 includes, for example, an ultrasonic transmitter 31 that transmits ultrasonic waves U, and an ultrasonic receiver 32 that is positioned opposite the ultrasonic transmitter 31 and receives the ultrasonic waves U. The position detection device 30 can detect the position of the width direction end of the polarizer F1 based on the fact that the intensity of the ultrasonic waves U received by the ultrasonic receiver 32 changes depending on whether or not a polarizer F1 is present between the ultrasonic transmitter 31 and the ultrasonic receiver 32. The position detection device 30 is not limited to an ultrasonic type, and various known configurations such as an optical type can be applied.

[0037] The position adjusting device 40 is a device that adjusts the conveying position of the polarizer F1 in the width direction based on the position of the end of the polarizer F1 in the width direction detected by the position detecting device 30. The position adjustment device 40 of this embodiment includes a transport roller 41 that transports the polarizer F1, a drive unit 42 such as a hydraulic cylinder that is connected to the transport roller 41 and can adjust the attitude (position and tilt) of the transport roller 41, and a control unit 43 that is electrically connected to the drive unit 42 and controls the drive unit 42. In the example shown in FIG. 2( a), the transport roller 41 that constitutes the position adjustment device 40 is disposed upstream of the position detection device 30 in the transport direction of the polarizer F1, but the present invention is not limited to this, and the transport roller 41 can also be disposed downstream of the position detection device 30 in the transport direction of the polarizer F1. The control unit 43 is also electrically connected to the position detection device 30, and receives as input the positions of the width direction ends of the polarizer F1 detected by the position detection device 30.

[0038] In the example shown in FIG. 2( a), there are multiple transport rollers (other than transport roller 41) located upstream of the position detection device 30 in the transport direction of the polarizer F1. Of these multiple transport rollers, transport roller 41 is located furthest downstream in the transport direction. Transport roller 41 is located a distance L upstream of the position detection device 30 in the transport direction of the polarizer F1. If this distance L is 1 m or more, the widthwise ends of the polarizer F1 are not constrained by the transport rollers before the polarizer F1 reaches the position detection device 30 (between the ultrasonic transmitter 31 and the ultrasonic receiver 32). This increases the risk of curl C occurring at the widthwise ends of the polarizer F1. Even in situations where curl C is likely to occur, the edge position controller 100 of this embodiment can correct the curl C and accurately detect the position of the widthwise ends of the polarizer F1.

[0039] Hereinafter, a method for manufacturing the polarizer F1 according to this embodiment (a method for adjusting the width direction end positions) using the manufacturing apparatus 200 (edge position controller 100) having the above configuration will be described.

[0040] FIG. 3 is a flowchart illustrating the outline of the procedure for manufacturing the polarizer F1 according to this embodiment. As shown in FIG. 3, the method for manufacturing the polarizer F1 according to this embodiment includes a curl correction step S1, a width direction end position detection step S2, and a width direction transport position adjustment step S3.

[0041] In the curl straightening step S1, after the polarizer F1 is dried by the drying device 3, the curl C generated at the width direction end portion of the polarizer F1 being transported in the longitudinal direction is straightened by the curl straightening device 20. In the width direction end position detecting step S2, the position of the width direction end of the polarizer F1 that has undergone the curl straightening step S1 is detected by the position detecting device 30.

[0042] In the width direction conveying position adjusting step S3, the conveying position of the polarizer F1 in the width direction is adjusted by the position adjusting device 40 based on the positions of the width direction ends of the polarizer F1 detected in the width direction end position detecting step S2. Specifically, the width direction end positions of the polarizer F1 detected in the width direction end position detection step S2 are input to the control means 43 of the position adjustment device 40. The control means 43 pre-stores information on how to change the attitude of the transport roller 41 depending on the width direction end positions of the polarizer F1. Specifically, for example, the correspondence between the width direction end positions of the polarizer F1 and the appropriate attitudes (positions and inclinations) of the transport roller 41 is stored in the form of a function or table. The appropriate attitude of the transport roller 41 is determined, for example, so that the width direction end of the polarizer F1 always passes through the center of the position detection device 30. The control means 43 selects the attitude of the transport roller 41 corresponding to the input width direction end positions of the polarizer F1 and outputs this as a control signal to the drive means 42. The drive means 42 adjusts the attitude of the transport roller 41 in accordance with the input control signal.

[0043] In the method for manufacturing the polarizer F1 according to this embodiment, the above steps S1 to S3 are repeatedly performed until there are no more polarizers F1 to be transported. According to the manufacturing method of the polarizer F1 according to the present embodiment described above, the curl correction step S1 is performed before the width direction end position detection step S2 is performed, in which the curl C generated at the width direction end of the polarizer F1 is corrected by the curl correction device 20, so that the positions of the width direction end portions of the polarizer F1 can be detected with high accuracy. Therefore, in the width direction transport position adjustment step S3, the transport position in the width direction of the polarizer F1 can be appropriately adjusted, and meandering of the polarizer F1 can be effectively prevented.

[0044] In this embodiment, an example has been described in which the optical film is a polarizer F1 and the edge position controller 100 is arranged on the exit side of the drying device 3, but the present invention is not limited to this and can be similarly applied to cases in which the edge position controller 100 is arranged at another position shown in Figure 1, or when the optical film in question is a polarizing film F, a retardation film, an anti-glare film, etc. [Explanation of symbols]

[0045] 20. Curl straightening device 21 Rotating roller 22 Shaft 30. Position detection device 40...Position adjustment device 41 Conveyor roller 42. Driving means 43 Control means 100 Edge Position Controller 200 Optical film (polarizer) manufacturing equipment C. Carl F1 polarizer F···Polarizing Film

Claims

1. a curl correction step of correcting curls generated at width direction ends of the optical film being conveyed in the longitudinal direction by a curl correction device; a width direction end position detecting step of detecting the positions of the width direction ends of the optical film that has been subjected to the curl correction step by a position detecting device; a width direction conveyance position adjusting step of adjusting a conveyance position of the optical film in the width direction based on the positions of the width direction ends of the optical film detected in the width direction end position detecting step; Including, The curl correction device is A shaft portion; a rotating roller attached to the shaft portion and rotatable in contact with an end portion of the optical film in the width direction; Equipped with the shaft portion is attached so as to be inclined at an angle α with respect to the width direction of the optical film when viewed from the longitudinal direction of the optical film, and is attached so as to be inclined at an angle β toward the upstream side in the transport direction of the optical film with respect to the width direction of the optical film when viewed from a direction perpendicular to the film surface of the optical film, The angle α is set to 0°<α≦20°, and the angle β is set to 0°<β≦15°. A method for manufacturing an optical film.

2. a conveying roller for conveying the optical film, which is located upstream of the position detecting device in the conveying direction of the optical film, is spaced 1 m or more upstream of the position detecting device in the conveying direction of the optical film; The method for producing the optical film according to claim 1 .

3. the optical film is a polarizer, the curl correction device and the position detection device are located on the outlet side of a drying device that dries the polarizer. A method for producing the optical film according to claim 1 or 2.

4. a curl correction device for correcting curls generated at width direction ends of the optical film being conveyed in the longitudinal direction; a position detection device for detecting the position of the width direction end of the optical film whose curl has been corrected by the curl correction device; a position adjusting device that adjusts a conveying position of the optical film in the width direction based on the position of the end of the optical film in the width direction detected by the position detecting device; Equipped with The curl correction device is A shaft portion; a rotating roller attached to the shaft portion and rotatable in contact with an end portion of the optical film in the width direction; Equipped with the shaft portion is attached so as to be inclined at an angle α with respect to the width direction of the optical film when viewed from the longitudinal direction of the optical film, and is attached so as to be inclined at an angle β toward the upstream side in the transport direction of the optical film with respect to the width direction of the optical film when viewed from a direction perpendicular to the film surface of the optical film, The angle α is set to 0°<α≦20°, and the angle β is set to 0°<β≦15°. Optical film manufacturing equipment.

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