CN113950633A - Method and apparatus for manufacturing optical film - Google Patents
Method and apparatus for manufacturing optical film Download PDFInfo
- Publication number
- CN113950633A CN113950633A CN202080042284.4A CN202080042284A CN113950633A CN 113950633 A CN113950633 A CN 113950633A CN 202080042284 A CN202080042284 A CN 202080042284A CN 113950633 A CN113950633 A CN 113950633A
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- Prior art keywords
- optical film
- curl
- polarizing plate
- width direction
- position detection
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- 239000012788 optical film Substances 0.000 title claims abstract description 109
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000011144 upstream manufacturing Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- 238000011282 treatment Methods 0.000 description 59
- 239000010408 film Substances 0.000 description 58
- 239000002994 raw material Substances 0.000 description 31
- 230000032258 transport Effects 0.000 description 31
- 206010042674 Swelling Diseases 0.000 description 10
- 238000004043 dyeing Methods 0.000 description 10
- 230000008961 swelling Effects 0.000 description 10
- 238000004132 cross linking Methods 0.000 description 8
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- 229920001477 hydrophilic polymer Polymers 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
- B65H23/032—Controlling transverse register of web
- B65H23/038—Controlling transverse register of web by rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/34—Apparatus for taking-out curl from webs
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/50—Auxiliary process performed during handling process
- B65H2301/51—Modifying a characteristic of handled material
- B65H2301/512—Changing form of handled material
- B65H2301/5125—Restoring form
- B65H2301/51254—Unshirring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/17—Nature of material
- B65H2701/175—Plastic
- B65H2701/1752—Polymer film
Abstract
The invention provides a method for manufacturing an optical film, which can correct the curl generated at the end part of the optical film in the width direction, can accurately detect the position of the end part of the optical film, and can effectively prevent the meandering of the optical film. The method for producing an optical film of the present invention comprises: a curl correction step (S1) in which a curl (C) generated at an end in the width direction of an optical film (F1) conveyed in the longitudinal direction is corrected by a curl correction device (20); a widthwise end position detection step (S2) of detecting the position of the widthwise end of the optical film after the curl correction step by a position detection device (30) in the widthwise end position detection step (S2); and a widthwise conveying position adjusting step (S3) in which the widthwise conveying position of the optical film is adjusted by the position adjusting device (40) on the basis of the position of the widthwise end of the optical film detected by the widthwise end position detecting step (S3).
Description
Technical Field
The present invention relates to a method for manufacturing an optical film and a manufacturing apparatus thereof. In particular, the present invention relates to a method and an apparatus for producing an optical film, the method and apparatus comprising: by correcting the curl generated at the end portion in the width direction of the optical film, the position of the end portion of the optical film can be detected with good accuracy, and the meandering of the optical film can be effectively prevented.
Background
Optical films have been conventionally used for image display devices such as liquid crystal display devices and organic EL display devices. Examples of the optical film include a polarizing plate, a polarizing film including a polarizing plate, a retardation film, and an antiglare film.
The optical film is generally produced by using a raw material film (Japanese: original reverse フィルム) in the form of a long tape. In general, a long-length optical film as a product is manufactured by sequentially performing various processes while conveying a raw material film in a longitudinal direction by a conveying apparatus having a conveying roller (see, for example, patent document 1). The optical film in the form of a long strip is cut into a size and a shape corresponding to the application, and is used for an image display device or the like.
Hereinafter, in the present specification, not only optical films as products but also films of raw materials and intermediate products are referred to as optical films.
In the above-described process for producing an optical film, there is a case where meandering of the optical film, which varies the transport position in the width direction of the optical film, occurs due to unevenness in thickness and tension of the optical film. If the meandering occurs, the cutting position and the cutting angle of the optical film are deviated. Therefore, a so-called edge position controller is applied, in which the position of the end portion in the width direction of the optical film is detected by a position detection device, and the posture (position, angle, etc.) of a transport roller that transports the optical film is adjusted (controlled) so that the position is always constant (for example, see patent document 2).
On the other hand, in the process of manufacturing an optical film, the optical film may be thermally shrunk and absorb moisture, and thus curl may be generated at the end portions in the width direction. For example, a polarizing plate is manufactured by subjecting a raw material film such as a polyvinyl alcohol film to a series of treatments such as a swelling treatment, a dyeing treatment, a crosslinking treatment, a stretching treatment, and a washing treatment, and then drying the film in a drying apparatus (oven). When drying is performed by this drying apparatus, curling may occur due to thermal contraction of the widthwise ends of the polarizing plate.
When the optical film in the state where the curl is generated reaches the position detection device, the position of the end portion in the width direction of the optical film cannot be accurately detected, and therefore, there is a possibility that the meandering of the optical film cannot be effectively prevented.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2018 and 092186
Patent document 2: japanese patent laid-open No. 2014-164002
Disclosure of Invention
Problems to be solved by the invention
An object of the present invention is to provide a method and an apparatus for manufacturing an optical film, in which the position of the end of the optical film can be accurately detected by correcting the curl generated at the end in the width direction of the optical film, and thereby the meandering of the optical film can be effectively prevented.
Means for solving the problems
In order to solve the above problems, the present invention provides a method for manufacturing an optical film, the method comprising: a curl correction step of correcting a curl generated at an end portion in a width direction of the optical film conveyed in a longitudinal direction by a curl correction device; a widthwise end position detection step of detecting a position of the widthwise end of the optical film after the curl correction step by using a position detection device; and a widthwise conveying position adjusting step of adjusting a conveying position of the optical film in a widthwise direction based on the position of the widthwise end of the optical film detected by the widthwise end position detecting step.
According to the present invention, since the curl correcting step of correcting the curl generated at the widthwise end of the optical film by the curl correcting device is performed before the widthwise end position detecting step is performed, the position of the widthwise end of the optical film can be accurately detected. Therefore, in the width direction conveyance position adjustment step, the conveyance position in the width direction of the optical film can be appropriately adjusted, and meandering of the optical film can be effectively prevented.
Preferably, the curl correction device includes a rotating roller that is rotatable while being in contact with the end portion in the width direction of the optical film.
In the above preferred method, since the curl correcting device includes the rotating roller that can rotate while being in contact with the end portion in the width direction of the optical film, the curl can be corrected while continuously conveying the optical film in the longitudinal direction without being affected by the curl correcting device in conveying the optical film.
Preferably, the curl correction device is located at a position within a distance of 1m from the position detection device on an upstream side in a transport direction of the optical film.
In the above preferred method, since the separation distance (separation distance in the transport direction of the optical film) between the curl correction device and the position detection device is relatively short (within 1 m), there is a low risk that the curl is generated again at the end portion in the width direction of the optical film before the optical film, the curl of which is corrected by the curl correction device, reaches the position detection device, and the position of the end portion in the width direction of the optical film can be detected with further high accuracy.
Preferably, the curl correcting device is attached to the position detecting device.
In the above-described preferred method, since the separation distance between the curl correction device and the position detection device is extremely short, there is no risk that the curl is generated again at the end portion in the width direction of the optical film before the optical film whose curl is corrected by the curl correction device reaches the position detection device, and the position of the end portion in the width direction of the optical film can be detected with further high accuracy.
The present invention is effective for the following cases: and a transport roller for transporting the optical film located on an upstream side in a transport direction of the optical film with respect to the position detection device, the transport roller being spaced from the position detection device by a distance of 1m or more on the upstream side in the transport direction of the optical film.
When the distance between the transport rollers located upstream in the transport direction and the position detection device is 1.5 times or more, specifically 1m or more, the width of the optical film, for example, the end in the width direction of the optical film is not restricted by the transport rollers until the optical film reaches the position detection device, and therefore, it is considered that the risk of curling occurring at the end in the width direction of the optical film increases. In such a situation where curling is likely to occur, by applying the present invention, curling can be corrected, and the position of the end in the width direction of the optical film can be detected with high accuracy.
The "distance between the transport rollers (omitted) is 1m or more" means that, when there are a plurality of transport rollers located on the upstream side in the transport direction of the optical film with respect to the position detection device, the distance between the transport roller position detection device located on the most downstream side in the transport direction among the plurality of transport rollers is 1m or more.
The present invention is also effective in a case where the optical film is likely to be curled, for example, in a case where the optical film is a polarizing plate and the position of the end in the width direction of the polarizing plate is detected on the output side of a drying device that dries the polarizing plate.
That is, in the case where the optical film is a polarizing plate, for example, the curl correcting device and the position detecting device are located on the output side of a drying device that dries the polarizing plate.
In order to solve the above problem, the present invention also provides an apparatus for manufacturing an optical film, comprising: a curl correcting device that corrects a curl generated at a widthwise end portion of the optical film conveyed in the longitudinal direction; a position detecting device that detects a position of a widthwise end portion of the optical film whose curl is corrected by the curl correcting device; and a position adjusting device that adjusts a conveying position in the width direction of the optical film based on the position of the end in the width direction of the optical film detected by the position detecting device.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, by correcting the curl generated at the end portion in the width direction of the optical film, the position of the end portion of the optical film can be detected with high accuracy, and the meandering of the optical film can be effectively prevented.
Drawings
Fig. 1 is a schematic diagram showing an example of a schematic configuration of the entire manufacturing apparatus of a polarizing film obtained from a polarizing plate manufactured by a manufacturing method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram showing a schematic configuration example of the vicinity of an edge position controller provided in the manufacturing apparatus shown in fig. 1.
Fig. 3 is a flowchart illustrating a schematic procedure of a method for manufacturing a polarizing plate according to an embodiment of the present invention.
Detailed Description
Hereinafter, a method and an apparatus for manufacturing an optical film according to an embodiment of the present invention will be described by taking an example in which the optical film is a polarizing plate, with reference to the drawings as appropriate.
Further, it should be noted that the drawings are given for reference, and the sizes, scales, and shapes of the members and the like shown in the drawings are sometimes different from those in reality.
Fig. 1 is a schematic diagram showing a schematic configuration example of the entire manufacturing apparatus of a polarizing film obtained from a polarizing plate manufactured by the manufacturing method of the present embodiment. The arrows shown in fig. 1 indicate the transport direction of the respective films.
In the production of the polarizing film F using the production facility shown in fig. 1, first, the raw material film F0 such as a polyvinyl alcohol film wound around the unwinding roll 1 is unwound, and the raw material film F0 is immersed in a treatment bath in the treatment tank 2 and subjected to various treatments such as dyeing and stretching. Subsequently, the resultant was dried by a drying device (oven) 3, thereby obtaining a polarizing plate F1. The thickness of the polarizing plate F1 is not particularly limited, but is usually about 1 μm to 80 μm, preferably 1 μm to 20 μm. The polarizing plate F1 may be a polarizing plate F1 obtained by subjecting a hydrophilic polymer film monomer such as a polyvinyl alcohol film to various treatments as a raw material film F0, or a polarizing plate F1 obtained by subjecting a member obtained by laminating a hydrophilic polymer film such as a polyvinyl alcohol film on a base material made of a non-hydrophilic polymer film such as a polyethylene terephthalate film to various treatments as a raw material film F0.
The processing tank 2 includes, for example, a swelling processing tank, a dyeing processing tank, a crosslinking processing tank, a stretching processing tank, and a cleaning processing tank, which are not shown, in this order from the upstream side in the conveying direction of the raw material film F0.
In the swelling treatment tank, the raw material film F0 was subjected to a swelling treatment. As the treatment bath in the swelling treatment tank, for example, water is used. By immersing the raw material film F0 in the treatment bath in the swelling treatment tank, the raw material film F0 can be cleaned, and the effect of swelling the raw material film F0 to prevent unevenness such as uneven dyeing can be expected. Glycerin, potassium iodide, and the like may be added to the treatment bath as appropriate. The temperature of the treatment bath is preferably 20 to 45 ℃ and more preferably 25 to 40 ℃. The immersion time of the raw material film F0 in the treatment bath is preferably 2 seconds to 180 seconds, more preferably 10 seconds to 150 seconds, and particularly preferably 60 seconds to 120 seconds. In the treatment bath in the swelling treatment tank, the raw material film F0 can be stretched at a stretch ratio of about 1.1 to 3.5 times inclusive of stretching due to swelling.
In the dyeing tank, the raw material film F0 subjected to the swelling treatment was subjected to dyeing treatment. As the treatment bath in the dyeing treatment tank, for example, a solution obtained by dissolving a dichroic substance such as iodine in a solvent is used. As the solvent, water is usually used, but a water-soluble organic solvent may be further added. By immersing the raw material film F0 in the treatment bath in the dyeing treatment tank, the dichroic material is adsorbed on the raw material film F0. The temperature of the treatment bath is preferably 5 to 42 ℃, more preferably 10 to 35 ℃. The immersion time of the raw material film F0 in the treatment bath is preferably 1 minute to 20 minutes, and more preferably 2 minutes to 10 minutes. The raw material film F0 can be stretched in the treatment bath in the dyeing treatment tank, and the cumulative total stretch ratio at this time is about 1.1 to 4.0 times.
In the crosslinking treatment tank, the raw material film F0 subjected to the dyeing treatment was subjected to crosslinking treatment. As the treatment bath in the crosslinking treatment tank, for example, a solution obtained by dissolving a crosslinking agent such as boric acid in a solvent is used. As the solvent, water is usually used, but a water-soluble organic solvent may be further added. The raw material film F0 was crosslinked by immersing the raw material film F0 in a treatment bath in a crosslinking treatment tank. The temperature of the treatment bath is generally from 20 ℃ to 70 ℃. The dipping time for dipping the raw material film F0 in the treatment bath is usually 1 second to 15 minutes, and preferably 5 seconds to 10 minutes. The raw material film F0 was stretched in the treatment bath in the crosslinking treatment tank, and the cumulative total stretching ratio in this case was about 1.1 to 4.0 times.
In the stretching treatment tank, the raw material film F0 subjected to the cross-linking treatment was subjected to stretching treatment. As the treatment bath in the stretching treatment tank, for example, a solution to which various metal salts, iodine, boron, or zinc compounds are added is used. As the solvent, water, ethanol, or various organic solvents are suitably used. In a state where the raw material film F0 was immersed in the treatment bath in the stretching treatment tank, the raw material film F0 was stretched so that the cumulative total stretching magnification became about 2 to 7 times. The temperature of the treatment bath is preferably 40 to 67 c, more preferably 50 to 62 c.
In the cleaning treatment tank, the raw material film F0 subjected to the stretching treatment was subjected to a cleaning treatment. As the treatment bath in the cleaning treatment tank, for example, an aqueous solution to which an iodide such as sodium iodide or potassium iodide is added is used. The raw material film F0 was cleaned (water-washed) by immersing the raw material film F0 in a treatment bath in a cleaning treatment tank. The temperature of the treatment bath is preferably 10 to 60 ℃, more preferably 15 to 40 ℃.
Next, in the example shown in fig. 1, an active energy ray-curable adhesive was applied to both surfaces of the polarizing plate F1 by the gravure coater 6. Then, the protective film F2 discharged from the discharge roller 5 was bonded to both surfaces of the polarizing plate F1 coated with the active energy ray-curable adhesive by the bonding roller 7. Next, the active energy ray-curable adhesive is cured by the active energy ray irradiation device 8, and then dried by the drying device (oven) 9. Finally, the surface protection film F3 fed from the feed roller 10 was bonded to one surface of the polarizing plate F1 having the protection film F2 bonded to both surfaces thereof by the bonding roller 11, thereby obtaining a polarizing film F. The obtained polarizing film F is wound by a winding roll 12.
The manufacturing apparatus 200 of the polarizing plate F1 of the present embodiment includes the discharge roll 1, the processing bath 2, and the drying device 3 in the manufacturing apparatus described above, and the edge position controller 100 disposed on the output side of the drying device 3.
Fig. 2 is a schematic diagram showing a schematic configuration example of the vicinity of the edge position controller 100 provided in the manufacturing apparatus 200. Fig. 2 (a) is a front view. Fig. 2 (b) is a plan view seen from the direction of arrow a (the longitudinal direction of the polarizing plate F1) in fig. 2 (a). Fig. 2 (c) is a side view seen from the direction of arrow B (the direction normal to the film surface of the polarizing plate F1) in fig. 2 (a).
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 40.
The curl correcting device 20 is a device for correcting a curl C generated at the widthwise end of the polarizing plate F1 conveyed in the longitudinal direction.
The curl correction device 20 of the present embodiment includes a rotating roller 21 that can rotate while contacting an end portion in the width direction (direction orthogonal to the longitudinal direction) of the polarizing plate F1. Specifically, the curl correcting device 20 includes a shaft 22 and a rotating roller 21 attached to the shaft 22 via a bearing (not shown). As the polarizing plate F1 is conveyed in the longitudinal direction, the rotating roller 21 can rotate in the θ direction shown in fig. 2 (a).
Since the curl correcting device 20 has the above-described configuration, the curl C can be corrected while continuously conveying the polarizing plate F1 in the longitudinal direction without affecting the conveyance of the polarizing plate F1 by the curl correcting device 20. However, the present invention is not limited to this, and a curl correction device without the rotating roller 21 (without a rotatable portion) may be used as long as the structure can correct the curl C of the polarizing plate F1.
The curl correcting device 20 of the present embodiment is located at a position within 1m from the position detecting device 30 on the upstream side in the conveying direction of the polarizing plate F1. In particular, the curl correction device 20 of the present embodiment is attached to the position detection device 30. Specifically, the shaft 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 in the conveying direction of the polarizing plate F1) by the attachment jig 23.
In the present embodiment, since the separation distance between the curl correction device 20 and the position detection device 30 (separation distance in the conveyance direction of the polarizing plate F1) is short, there is no fear that the curl C is generated again at the widthwise end of the polarizing plate F1 before the polarizing plate F1, the curl C of which is corrected by the curl correction device 20, reaches the position detection device 30, and the position of the widthwise end of the polarizing plate F1 can be detected more accurately.
As shown in fig. 2 b, the shaft 22 of the curl correction device 20 of the present embodiment is attached so as to be inclined at an angle α toward a direction in which a curl C is predictable (in the example shown in fig. 2 b, the right direction) with respect to the width direction of the polarizing plate F1 (the vertical direction of fig. 2 b) when viewed from the longitudinal direction of the polarizing plate F1. As shown in fig. 2 c, the shaft 22 of the curl correction device 20 of the present embodiment is attached so as to be inclined at an angle β toward the upstream side (the upper side in fig. 2 b) of the polarizing plate F1 in the transport direction with respect to the width direction of the polarizing plate F1 (the left-right direction in fig. 2 b) when viewed from the direction orthogonal to the film surface of the polarizing plate F1.
Preferably, the angle α is set to 0 ° ≦ α ≦ 20 °, and the angle β is set to 0 ° ≦ β ≦ 15 °.
The shaft 22 and the rotating roller 21 may be attached so as to be parallel to the width direction of the polarizing plate F1 (where α ═ β ═ 0 °), but in view of facilitating effective correction of only the curl C, the shaft is preferably attached so as to be inclined at the angles α and β (α > 0 °, β > 0 °), as described above. That is, by mounting the polarizing plate F1 at the inclination angle α (α > 0 °), the rotary roller 21 is more likely to contact only the curl C, and the portion of the end of the polarizing plate F1 where the curl C is not generated can be prevented from being damaged by friction. Further, by mounting the polarizing plate at the inclination angle β (β > 0 °), a force toward the widthwise outer side of the polarizing plate F1 is easily applied to the curl C from the rotating roller 21, and the curl C bent toward the widthwise inner side of the polarizing plate F1 is easily restored.
The position detecting device 30 is located on the downstream side of the curl correcting device 20 in the conveyance direction of the polarizing plate F1, and detects the position of the end portion in the width direction of the polarizing plate F1, the curl C of which is corrected by the curl correcting device 20.
As the position detection device 30 of the present embodiment, for example, an ultrasonic type position detection device is used. Specifically, the position detection device 30 includes, for example, an ultrasonic wave transmission unit 31 that transmits the ultrasonic wave U, and an ultrasonic wave reception unit 32 that is located at a position facing the ultrasonic wave transmission unit 31 and receives the ultrasonic wave U. The position detection device 30 can detect the position of the end in the width direction of the polarizing plate F1, depending on whether or not the polarizing plate F1 is present between the ultrasonic wave transmission unit 31 and the ultrasonic wave reception unit 32, depending on the intensity of the ultrasonic wave U received by the ultrasonic wave reception unit 32.
The position detection device 30 is not limited to the ultrasonic type, and various known configurations such as an optical type can be applied.
The position adjusting device 40 is a device that adjusts the conveying position in the width direction of the polarizing plate F1 in accordance with the position of the widthwise end of the polarizing plate F1 detected by the position detecting device 30.
The position adjustment device 40 of the present embodiment includes: a conveying roller 41 that conveys the polarizing plate F1; a driving member 42 such as a hydraulic cylinder connected to the conveying roller 41 and capable of adjusting the posture (position and inclination) of the conveying roller 41; and a control part 43 electrically connected to the driving part 42 and controlling the driving part 42. In the example shown in fig. 2 (a), the transport roller 41 constituting the position adjusting device 40 is disposed on the upstream side in the transport direction of the polarizing plate F1 with respect to the position detecting device 30, but the present invention is not limited to this, and the transport roller 41 may be disposed on the downstream side in the transport direction of the polarizing plate F1 with respect to the position detecting device 30. The control unit 43 is also electrically connected to the position detection device 30, and the position of the widthwise end of the polarizing plate F1 detected by the position detection device 30 is input to the control unit 43.
In the example shown in fig. 2 a, although there are a plurality of transport rollers (transport rollers other than the transport roller 41 are not shown) located on the upstream side in the transport direction of the polarizing plate F1 with respect to the position detection device 30, the transport roller 41 of the plurality of transport rollers is located on the most downstream side in the transport direction. The conveying roller 41 is spaced apart from the position detection device 30 by a distance L on the upstream side in the conveying direction of the polarizing plate F1. When the distance L is 1m or more, the widthwise end of the polarizing plate F1 is not restrained by the conveying rollers until the polarizing plate F1 reaches the position detection device 30 (reaches between the ultrasonic wave transmission unit 31 and the ultrasonic wave reception unit 32), and therefore it is considered that the risk of the occurrence of the curl C at the widthwise end of the polarizing plate F1 becomes high. Even in such a situation where the curl C is likely to occur, the curl C can be corrected by applying the edge position controller 100 of the present embodiment, and the position of the end portion in the width direction of the polarizing plate F1 can be detected with high accuracy.
A method for producing the polarizing plate F1 (method for adjusting the position of the end in the width direction) according to the present embodiment using the production apparatus 200 (edge position controller 100) having the above-described configuration will be described below.
Fig. 3 is a flowchart illustrating a schematic procedure of a method for manufacturing the polarizing plate F1 according to the present embodiment.
As shown in fig. 3, the method for manufacturing the polarizing plate F1 of the present embodiment includes a curl correction step S1, a width direction end position detection step S2, and a width direction conveyance position adjustment step S3.
In the curl correction step S1, after drying by the drying device 3, the curl C generated at the widthwise end portion of the polarizing plate F1 conveyed in the longitudinal direction is corrected by the curl correction device 20.
In the widthwise end position detecting step S2, the position of the widthwise end of the polarizing plate F1 after the curl correcting step S1 is detected by the position detecting device 30.
In the widthwise conveying position adjusting step S3, the conveying position of the polarizing plate F1 in the widthwise direction is adjusted by the position adjusting device 40 based on the position of the widthwise end of the polarizing plate F1 detected in the widthwise end position detecting step S2.
Specifically, the position of the widthwise end of the polarizing plate F1 detected in the widthwise end position detecting step S2 is input to the control unit 43 of the position adjusting device 40. In the control section 43, contents of how the posture of the conveying roller 41 should be changed according to the position of the widthwise end portion of the polarizing plate F1 are stored in advance. Specifically, for example, the correspondence between the position of the widthwise end of the polarizing plate F1 and the appropriate posture (position, inclination) of the conveying roller 41 is stored in a function or table format. The appropriate posture of the conveyance roller 41 is determined such that, for example, the widthwise end of the polarizing plate F1 always passes through the center of the position detection device 30. The control unit 43 selects the posture of the conveying roller 41 corresponding to the inputted position of the end portion in the width direction of the polarizing plate F1, and outputs the posture to the drive unit 42 as a control signal. The driving section 42 adjusts the posture of the conveying roller 41 in accordance with the inputted control signal.
In the method of manufacturing the polarizing plate F1 of the present embodiment, the above-described steps S1 to S3 are repeatedly performed until the polarizing plate F1 being conveyed is used up.
With the above-described method for manufacturing the polarizing plate F1 of the present embodiment, the curl correction step S1 for correcting the curl C generated at the widthwise end of the polarizing plate F1 by the curl correction device 20 is performed before the widthwise end position detection step S2 is performed, and therefore the position of the widthwise end of the polarizing plate F1 can be detected with high accuracy. Therefore, in the width direction conveying position adjusting step S3, the conveying position in the width direction of the polarizing plate F1 can be appropriately adjusted, and meandering of the polarizing plate F1 can be effectively prevented.
In the present embodiment, an example has been described in which the optical film is the polarizing plate F1 and the edge position controller 100 is disposed on the output side of the drying device 3, but the present invention is not limited to this, and the present invention can be similarly applied also to a case where the edge position controller 100 is disposed at another position shown in fig. 1, or a target optical film is the polarizing film F, or a target optical film is a retardation film, an antiglare film, or the like.
Description of the reference numerals
20. A curl correcting device; 21. a rotating roller; 22. a shaft portion; 30. a position detection device; 40. a position adjusting device; 41. a conveying roller; 42. a drive member; 43. a control component; 100. an edge position controller; 200. an optical film (polarizing plate) manufacturing device; C. curling; f1, polarizing plate; F. a polarizing film.
Claims (7)
1. A method for manufacturing an optical film, wherein,
the manufacturing method of the optical film comprises the following steps:
a curl correction step of correcting a curl generated at an end portion in a width direction of the optical film conveyed in a longitudinal direction by a curl correction device;
a widthwise end position detection step of detecting a position of the widthwise end of the optical film after the curl correction step by using a position detection device; and
a width direction conveying position adjusting step of adjusting a conveying position of the optical film in a width direction based on the position of the end in the width direction of the optical film detected by the width direction end position detecting step.
2. The method of manufacturing an optical film according to claim 1,
the curl correction device includes a rotating roller that can rotate while being in contact with an end portion of the optical film in the width direction.
3. The method for producing an optical film according to claim 1 or 2,
the curl correction device is located at a position within a distance of 1m from the position detection device on an upstream side in a transport direction of the optical film.
4. The method for producing an optical film according to any one of claims 1 to 3,
the curl correcting device is attached to the position detecting device.
5. The method for producing an optical film according to any one of claims 1 to 4,
and a transport roller for transporting the optical film located on an upstream side in a transport direction of the optical film with respect to the position detection device, the transport roller being spaced from the position detection device by a distance of 1m or more on the upstream side in the transport direction of the optical film.
6. The method for producing an optical film according to any one of claims 1 to 5,
the optical film is a polarizing plate,
the curl correcting means and the position detecting means are located on an output side of a drying means that dries the polarizing plate.
7. An apparatus for manufacturing an optical film, wherein,
the optical film manufacturing apparatus includes:
a curl correcting device that corrects a curl generated at a widthwise end portion of the optical film conveyed in the longitudinal direction;
a position detecting device that detects a position of a widthwise end portion of the optical film whose curl is corrected by the curl correcting device; and
and a position adjusting device that adjusts a transport position in the width direction of the optical film based on the position of the end in the width direction of the optical film detected by the position detecting device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-108683 | 2019-06-11 | ||
| JP2019108683 | 2019-06-11 | ||
| PCT/JP2020/001644 WO2020250476A1 (en) | 2019-06-11 | 2020-01-20 | Method and apparatus for manufacturing optical film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113950633A true CN113950633A (en) | 2022-01-18 |
Family
ID=73781732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080042284.4A Pending CN113950633A (en) | 2019-06-11 | 2020-01-20 | Method and apparatus for manufacturing optical film |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPWO2020250476A1 (en) |
| KR (1) | KR20220018501A (en) |
| CN (1) | CN113950633A (en) |
| TW (1) | TW202045599A (en) |
| WO (1) | WO2020250476A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924539A (en) * | 2022-07-22 | 2022-08-19 | 深圳市麦瑞包装制品有限公司 | Control system for intelligently managing film production based on real-time feedback |
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- 2020-01-20 CN CN202080042284.4A patent/CN113950633A/en active Pending
- 2020-01-20 WO PCT/JP2020/001644 patent/WO2020250476A1/en active Application Filing
- 2020-01-20 KR KR1020217040886A patent/KR20220018501A/en unknown
- 2020-01-20 JP JP2021525904A patent/JPWO2020250476A1/ja active Pending
- 2020-02-06 TW TW109103655A patent/TW202045599A/en unknown
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| JPS57121697U (en) * | 1981-01-16 | 1982-07-28 | ||
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| JPH1190944A (en) * | 1997-09-22 | 1999-04-06 | Konica Corp | Method and apparatus for producing plastic film |
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| CN114924539A (en) * | 2022-07-22 | 2022-08-19 | 深圳市麦瑞包装制品有限公司 | Control system for intelligently managing film production based on real-time feedback |
| CN114924539B (en) * | 2022-07-22 | 2022-11-04 | 深圳市麦瑞包装制品有限公司 | Control system for intelligently managing film production based on real-time feedback |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2020250476A1 (en) | 2020-12-17 |
| KR20220018501A (en) | 2022-02-15 |
| WO2020250476A1 (en) | 2020-12-17 |
| TW202045599A (en) | 2020-12-16 |
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