WO2010001752A1 - 光学フィルムの製造方法、及び光学フィルム - Google Patents
光学フィルムの製造方法、及び光学フィルム Download PDFInfo
- Publication number
- WO2010001752A1 WO2010001752A1 PCT/JP2009/061301 JP2009061301W WO2010001752A1 WO 2010001752 A1 WO2010001752 A1 WO 2010001752A1 JP 2009061301 W JP2009061301 W JP 2009061301W WO 2010001752 A1 WO2010001752 A1 WO 2010001752A1
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- WIPO (PCT)
- Prior art keywords
- film
- embossed
- optical film
- forming
- casting
- Prior art date
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/16—Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/28—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on an endless belt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/007—Forming single grooves or ribs, e.g. tear lines, weak spots
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/009—Using laser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
Definitions
- the present invention relates to an optical film manufacturing method and an optical film obtained by the manufacturing method.
- a resin film having excellent translucency such as a cellulose ester resin film is used.
- a resin film is manufactured by, for example, a solution casting film forming method and a melt casting film forming method.
- the solution casting film forming method is a method in which a resin solution obtained by dissolving a raw material resin in a solvent is cast on a traveling support, and the film obtained by drying to some extent is peeled off from the support, and the peeled film Is a method of producing a resin film by drying while transporting the film with a transport roller.
- the melt casting film forming method is a method in which a molten resin obtained by heating and melting a raw material resin is cast on a support, the film obtained by cooling and solidifying to some extent is peeled off from the support, and the peeled film is conveyed. This is a method for producing a resin film by further cooling and solidifying while being conveyed by a roller.
- Patent Document 1 in a method for producing a cellulose acetate film by a solution casting film forming method, a film peeled from a support is dried while being conveyed by a conveying roller, and is applied to at least one end of the film.
- a solution casting film forming method for imparting knurling by unevenness is described. It is described that the knurling is performed by contact-type processing in which a film in which the solvent remains is sandwiched between engraving rollers.
- Patent Document 1 it is disclosed that generation of scratches and wrinkles can be suppressed.
- the end of the film in which the solvent remains is subjected to the contact processing as described above, since the film is soft, holes are formed, and the film conveyance speed and the marking are engraved.
- the film may be broken only by a slight deviation from the processing speed by the roller.
- the processing by the engraving roller is physical unevenness processing, and the formed unevenness may be crushed by the tension and temperature of the film during conveyance.
- the present invention has been made in view of such circumstances, and provides a method for producing an optical film that is excellent in transportability by a transport roller and that suppresses the generation of scratches caused by sliding on the transport roller during transport. . Moreover, it aims at providing the optical film obtained by the manufacturing method of such an optical film.
- the method for producing an optical film according to one aspect of the present invention includes an embossed portion forming step of forming a band-shaped embossed portion having a plurality of convex portions at at least one end in a direction perpendicular to the film conveyance direction,
- the embossed part forming step is characterized in that the embossed part is formed in a non-contact manner during the conveyance of the film.
- the embossed portion is formed in a non-contact manner, even if the film for forming the embossed portion is in a state where the solvent remains or is not completely solidified, It is suppressed that a convex part is crushed and a film is fractured. Accordingly, it is possible to increase the friction with the transport roller and improve the transportability with the transport roller. And since the embossed part which can raise friction with a conveyance roller is formed in order at the end of a film during conveyance of a film, even if a film is conveyed continuously, a film may slip on a conveyance roller. It is suppressed.
- the conveyance synchronism between the rotation speed of the conveyance roller and the conveyance speed of the film is good.
- the transport roller comes into contact with the embossed portion having a plurality of convex portions, air intervening between the transport roller and the film escapes between the convex portions, and air intervenes between the transport roller and the film. It is suppressed. Also from this, the transportability by the transport roller is improved.
- the transportability by the transport roller is excellent, and the generation of scratches due to the film slipping on the transport roller is suppressed.
- working support body and forms a film the peeling process which peels the said film from the said support body, and peeling
- the embossed part forming step is performed between the peeling step and the drying step.
- the drying step includes drying the film by conveying the film with a plurality of conveying rollers.
- the embossing part forming step comprises a cooling step to form, a peeling step for peeling the film from the support, and a stretching step for stretching the film by transporting the peeled film with a plurality of transport rollers. It is preferable to be performed between the peeling step and the stretching step.
- the embossed portion forming step is performed between the peeling step and the stretching step.
- the transportability of the film can be improved, and the generation of scratches caused by sliding on the transport roller is suppressed.
- the ratio of the height of the convex portion before winding the film on which the embossed portion is formed to the height of the convex portion immediately after forming the embossed portion is conveyed by a conveyance roller is 50 to 90%. And it is preferable that the height of the said convex part before conveying and winding up is 10 micrometers or more. According to such a structure, even if a film is conveyed with a conveyance roller, the conveyance property of a film is fully securable.
- the embossed portion forming step is a step of forming the embossed portion by irradiating the film before forming the embossed portion with laser light. According to such a structure, it is suppressed more that the convex part of an embossing part is crushed, and it is suppressed that a film is fractured
- the embossed portion forming step moves the irradiation position of the laser beam during the conveyance of the film.
- the position which forms an embossed part can be suitably adjusted during conveyance of a film.
- the embossed part forming step forms the embossed part by applying a liquid material for forming the embossed part by an ink jet method. According to such a structure, it is suppressed more that the convex part of an embossing part is crushed, and it is suppressed that a film is fractured
- the optical film according to another aspect of the present invention is obtained by the method for producing an optical film. According to such a structure, since the conveyance property of the film at the time of manufacturing an optical film improves, a film is manufactured without sliding on a conveyance roller. Therefore, an optical film in which the generation of scratches caused by sliding on the transport roller is suppressed can be obtained.
- the present invention there is provided a method for producing an optical film which is excellent in transportability by a transport roller and in which the generation of scratches is suppressed. Moreover, the optical film obtained by the manufacturing method of such an optical film is provided.
- FIG. 4A is a schematic diagram
- FIG. 4B is a photograph of an image read by an image reading apparatus. It is sectional drawing of the film which shows other embodiment of an embossing part.
- the method for producing an optical film according to the present invention comprises an embossed portion forming step of forming a band-shaped embossed portion having a plurality of convex portions at at least one end in a direction perpendicular to the film transport direction, and the embossed portion A formation process forms the said embossed part by a non-contact system during conveyance of the said film.
- the manufacturing method of the optical film which concerns on this invention will not be specifically limited if the said embossed part formation process is provided. Specifically, for example, in the solution casting film forming method and the melt casting film forming method, before the film is transported by the transport roller, a method for producing the optical film by performing the embossed part forming step is mentioned. It is done.
- the manufacturing method of the optical film which concerns on this 1st Embodiment is a casting process which casts the resin solution (dope) containing transparent resin on the driving
- it is performed by an optical film manufacturing apparatus as shown in FIG.
- an optical film manufacturing apparatus if the said each process is performed, it will not specifically limit to what is shown in FIG. 1, The thing of another structure may be sufficient.
- the film means a film after a cast film (web) made of a dope cast on a support is dried on the support and can be peeled off from the support.
- FIG. 1 is a schematic diagram showing a basic configuration of an optical film manufacturing apparatus 11 by a solution casting film forming method.
- the optical film manufacturing apparatus 11 includes an endless belt support 12, a casting die 13, a peeling roller 14, a stretching apparatus 15, an embossed part forming apparatus 16, a drying apparatus 17, a winding apparatus 18, and the like.
- the casting die 13 casts a resin solution (dope) 19 in which a transparent resin is dissolved onto the surface of the endless belt support 12.
- the endless belt support 12 is formed into a film by forming a web made of the dope 19 cast from the casting die 13 and drying it while being conveyed.
- the peeling roller 14 peels the film from the endless belt support 12.
- the stretching device 15 stretches the peeled film.
- the embossed part forming device 16 forms an embossed part at the end of the stretched film.
- the drying device 17 dries the film on which the embossed portion is formed while being conveyed by a conveying roller.
- the winding device 18 winds the dried film into a film roll.
- the casting die 13 is supplied with a dope 19 from a dope supply pipe connected to the upper end of the casting die 13. Then, the supplied dope is discharged from the casting die 13 to the endless belt support 12, and a web is formed on the endless belt support 12.
- the endless belt support 12 is a metal endless belt having a mirror surface and traveling infinitely.
- a belt made of stainless steel or the like is preferably used from the viewpoint of peelability of the film.
- the width of the cast film cast by the casting die 13 is preferably 80 to 99% of the width of the endless belt support 12 from the viewpoint of effectively utilizing the width of the endless belt support 12. .
- the width of the endless belt support 12 is preferably 1800 to 5000 mm.
- a rotating metal drum (endless drum support) having a mirror surface may be used instead of the endless belt support.
- the endless belt support 12 dries the solvent in the dope while transporting a cast film (web) formed on the surface thereof.
- the drying is performed, for example, by heating the endless belt support 12 or blowing heated air on the web.
- the temperature of the web varies depending on the dope solution, the range of ⁇ 5 to 70 ° C. is preferable and the range of 0 to 60 ° C. is preferable in consideration of the conveyance speed and productivity accompanying the evaporation time of the solvent. More preferred.
- the higher the temperature of the web the faster the solvent can be dried. However, when the temperature is too high, the web tends to foam or the flatness tends to deteriorate.
- a method of heating the web on the endless belt support 12 with an infrared heater for example, a method of heating the back of the endless belt support 12 with an infrared heater, the back of the endless belt support 12 And a method of heating by blowing heated air, and the like can be selected as needed.
- the wind pressure of the heated air is preferably 50 to 5000 Pa in consideration of the uniformity of solvent evaporation and the like.
- the temperature of the heating air may be dried at a constant temperature, or may be supplied in several steps in the running direction of the endless belt support 12.
- the time from casting the dope on the endless belt support 12 to peeling the web from the endless belt support 12 varies depending on the film thickness of the optical film to be produced and the solvent used. In consideration of the peelability from the belt support 12, it is preferably in the range of 0.5 to 5 minutes.
- the transport speed of the cast film by the endless belt support 12 is preferably about 50 to 200 m / min, for example.
- the optical film manufacturing apparatus according to the first embodiment can be used even at a conveyance speed of 100 to 200 m / min, which is likely to cause problems such as film breakage. An optical film can be produced while suppressing the occurrence of defects.
- the ratio (draft ratio) of the transport speed of the cast film to the traveling speed of the endless belt support 12 is preferably about 0.8 to 1.2. When the draft ratio is within this range, the cast film can be stably formed. For example, if the draft ratio is too large, there is a tendency to cause a phenomenon called neck-in in which the cast film is reduced in the width direction, and if so, a wide film cannot be formed.
- the peeling roller 14 is in contact with the surface of the endless belt support 12 on which the dope 19 is cast, and the dried web (film) is peeled by applying pressure to the endless belt support 12 side. .
- the film is peeled from the endless belt support 12
- the film is stretched in the film transport direction (machine direction: MD direction) by the peeling tension and the subsequent transport tension.
- MD direction film transport direction
- the peeling tension and the conveying tension when peeling the film from the endless belt support 12 are 50 to 400 N / m.
- the total residual solvent amount of the film when the film is peeled off from the endless belt support 12 is formed after the peelability from the endless belt support 12, the residual solvent amount at the time of peeling, the transportability after peeling, and the transport / drying.
- the content is preferably 30 to 200% by mass.
- the stretching device 15 stretches the film peeled from the endless belt support 12 in a direction perpendicular to the web conveyance direction (Transverse Direction: TD direction). Specifically, both ends in a direction perpendicular to the film transport direction are gripped with a clip or the like, and the distance between the opposing clips is increased to extend in the TD direction. And the said extending
- the total residual solvent amount of the film stretched by the stretching device 15 is preferably 1 to 20% by mass in order to form a suitable embossed portion by the embossed portion forming device 16.
- the total residual solvent amount of the film is 1 to 20% by mass before the film is supplied to the embossed part forming device 16.
- the embossed part forming device 16 forms an embossed part in a non-contact manner at the end of at least one end in the direction (width direction) perpendicular to the film transport direction during the transport of the film.
- the embossed portion is a belt-like shape having a plurality of convex portions, and is a bulky at least one end portion in the width direction of the film.
- the width of the embossed portion varies depending on the width of the film and the like, but is preferably 5 to 50 mm, and more preferably 10 to 40 mm from the viewpoint of improving the transportability of the film.
- the width of the embossed portion is too narrow, the film transportability tends not to be sufficiently improved.
- variety of an embossed part is too wide, the area of the area
- the ratio of the height of the convex portion before winding, when the film on which the embossed portion is formed with respect to the height of the convex portion immediately after forming the embossed portion is conveyed by a later-described conveying roller is 50 to 90. % Is preferable, and 60 to 85% is more preferable. If the ratio is too low, the transportability by the transport roller tends to be gradually lowered. If the ratio is too high, the film or the transport roller may be damaged due to the convex portion being too hard. Moreover, it is preferable that the height of the said convex part before conveying and winding is 10 micrometers or more, and it is more preferable that it is 15 micrometers or more.
- the film can be sufficiently transported even if the film is transported by the transport roller. That is, sufficient transportability can be ensured by the transport roller to the end.
- the height of the convex portion immediately after the formation of the embossed portion is not particularly limited as long as the above conditions are satisfied, but is preferably about 15 to 40 ⁇ m, for example, from the viewpoint of securing initial transportability. .
- the embossed part forming device 16 is not particularly limited as long as the embossed part can be formed in a non-contact manner. Specifically, for example, laser processing as described later, an inkjet method, and the like can be given.
- the embossed part forming apparatus by the laser processing is not particularly limited as long as the embossed part can be formed by irradiating the film before forming the embossed part with laser light.
- a CO 2 laser beam irradiation device, a YAG laser beam irradiation device, and the like can be given.
- the means for condensing the laser light is not particularly limited, and examples thereof include generally used means such as a lens, a prism, and a mirror.
- the laser beam irradiation device is preferably capable of moving the irradiation position of the laser beam during the conveyance of the film.
- the film temperature at the laser beam irradiation position is preferably about 300 to 600 ° C. from the viewpoint of processing.
- the temperature of the film immediately before laser processing is not particularly limited as long as a good embossed portion can be formed. Specifically, for example, the temperature is preferably about 10 to 150 ° C.
- the film temperature immediately before laser processing is preferably set to a high temperature of about 40 to 150 ° C.
- the embossing formed when the laser is irradiated can be made higher. If a sufficiently high convex portion is formed at a film temperature of about 10 to 40 ° C., this temperature range is preferable from the viewpoint of driveability of the laser light irradiation apparatus.
- the film temperature immediately before laser processing is substantially equal to the temperature around the film, but if the temperature of the laser beam irradiation device is too high or too low, the optical system and drive system will be distorted and the operation and drive will become unstable. For this reason, when the temperature around the film is 10 to 40 ° C., it is necessary to control the temperature so that the laser beam irradiation apparatus is kept at about 10 to 40 ° C., which increases the equipment cost. Further, if the film temperature is higher than 150 ° C., the optical performance of the film is affected, which is not preferable. In addition, when the film is partially heated to a high temperature, the film is twisted, causing the film to meander and cause breakage due to uneven tension.
- FIG. 4 is a plan view of the film immediately after the embossed portion is formed in the embodiment.
- FIG. 5 is a view showing a cross section in a direction (AA line) orthogonal to the film transport direction of FIG.
- FIG. 5A is a schematic cross-sectional view taken along line AA in FIG. 4, and
- FIG. 5B is an enlarged cross-sectional photograph taken along line AA in FIG.
- a film 111 is a strip-like long film having a predetermined substantially constant width and a predetermined substantially constant film thickness, and is substantially linear along the conveying direction X at least at both side end portions 112, 112.
- Embossed portions 113, 113 are formed.
- the embossed portion 113 may be formed substantially linearly along the transport direction X, not only between the side end portions 112 and 112 but also between the side end portions 112 and 112.
- the embossed portion 113 may be further formed along the transport direction X at a substantially central portion in the width direction Y of the film 111. Note that the embossed portion 113 may be formed over the entire length of the film 111 or may be formed intermittently.
- the embossed portion 113 is formed in a substantially linear shape along the conveying direction X and a pair of convex portions 113 b and 113 b formed in a substantially linear shape along the conveying direction X.
- the concave portion 113a is formed on one main surface (front surface) 114a of the film 111 on which the pair of convex portions 113b and 113b are formed between the pair of convex portions 113b and 113b. It is formed on the other main surface (back surface) 114b facing each other.
- a substantially concave second recess 113c along the transport direction X is formed on one main surface 114a of the resin film 111 on which the pair of protrusions 113b and 113b are formed between the pair of protrusions 113b and 113b. Further formed.
- one laser light irradiation apparatus may be used, but two or more laser light irradiation apparatuses are provided, and lasers are irradiated by each laser light irradiation apparatus. It may be installed such that a plurality of light positions are arranged in a direction perpendicular to the film transport direction.
- the width of the embossed portion can be optimized by adjusting the diameter of the laser beam, but it is difficult to form a convex portion having a shape suitable for improving the transportability.
- the width of the embossed portion can be optimized by reflecting the laser beam at various angles by a mirror or the like, but it becomes impossible to cope with the case where the film conveyance speed is increased.
- the embossed part forming apparatus by laser processing, the embossed part may be formed as described above, and the outer side of the embossed part may be cut with a laser beam.
- the output of the laser light of the laser light irradiation device that irradiates the laser light to the position closest to the end of the film is increased. Etc. By doing so, for example, in the stretching device 15, it is possible to cut the region that has been gripped by the clip.
- the embossed part forming apparatus by laser processing may be any apparatus that irradiates the film that has been conveyed with laser light.
- the oxygen concentration around the film may be reduced. preferable. Generation of dust and gas generated when the film is irradiated with laser light can be suppressed.
- a configuration in which a film is transported into a housing provided with an inlet and an outlet through which an inert gas can be introduced, and laser light is irradiated in the housing is included. By supplying an inert gas from the inlet and discharging the gas in the housing from the outlet, the oxygen concentration around the film can be reduced.
- examples of the inert gas include rare gases such as argon and neon, nitrogen gas, and the like, and nitrogen gas is preferably used from the viewpoint of cost.
- it is preferable to make an inert gas flow in so that the oxygen concentration of the laser beam processing part which processes a film with the laser beam irradiated from the laser beam irradiation apparatus may be 15 volume% or less, for example.
- the embossed part forming apparatus using the ink jet method is not particularly limited as long as the embossed part can be formed by applying a liquid material for forming the embossed part using the ink jet method.
- a liquid material for forming the embossed part using the ink jet method Specifically, for example, a known inkjet device can be used.
- the ink jet apparatus is also preferable in that the thickness of the embossed portion can be changed by changing the coating amount of the liquid material in accordance with the film conveyance speed.
- the embossed portion may be cut before being used as an optical film, and is actually often cut. Therefore, the material of the embossed part is not particularly limited as long as the transportability of the film can be improved. Specifically, for example, when the embossed part forming apparatus by laser processing is used, the film is deformed by the laser beam, so that it is the same material as the film. Moreover, when the embossed part forming apparatus by the said inkjet system is used, as a embossed part, a well-known resin layer etc. are mentioned, for example. This resin layer preferably has high adhesion to the film.
- the form of the embossed part is not particularly limited.
- the number of the embossed part may be one or two or more.
- the said embossed part should just be formed the convex part which can improve the conveyance property of a film.
- a concave portion may be formed between adjacent convex portions, or a hole 115 may be formed between adjacent convex portions as shown in FIG. May be.
- the film breaks starting from that portion.
- the hole can be formed without breaking.
- the embossed part is preferably formed at both ends of the film in order to enhance the film transportability and prevent the film transport from being biased.
- the surface on which the embossed portion is formed may be formed on a surface on which the scratch is easily generated by the transport roller, or may be formed on both surfaces.
- the drying device 17 includes a plurality of transport rollers, and dries the film while transporting the film between the rollers. In that case, you may dry using heating air, infrared rays, etc. independently, and you may dry using heating air and infrared rays together. It is preferable to use heated air from the viewpoint of simplicity.
- the drying temperature varies depending on the amount of residual solvent in the film. However, the drying temperature is appropriately selected in the range of 30 to 180 ° C. depending on the amount of residual solvent in consideration of drying time, shrinkage unevenness, stability of expansion and contraction, and the like. That's fine. Further, it may be dried at a constant temperature, or may be divided into two to four stages of temperature and may be divided into several stages of temperature.
- the film can be stretched in the MD direction while being conveyed in the drying device 17.
- the amount of residual solvent in the film after the drying treatment in the drying device 17 is preferably 0.01 to 15% by mass in consideration of the load of the drying process, the dimensional stability expansion / contraction ratio during storage, and the like.
- the winding device 18 winds the film having a predetermined residual solvent amount on the winding core to the required length by the drying device 17.
- the temperature at the time of winding is preferably cooled to room temperature in order to prevent scratches and loosening due to shrinkage after winding.
- the winder to be used can be used without particular limitation, and may be a commonly used one, such as a constant tension method, a constant torque method, a taper tension method, or a program tension control method with a constant internal stress. Can be wound up.
- the embossed portion may be cut off by the winding device 18 with the embossed portion formed, and the embossed portion may be cut out just before being used as an optical film.
- the film with the embossed portion formed is wound by the winding device 18, when the film is stored in the state of a film roll, the generation of scratches due to contact between the films is suppressed. be able to.
- the width of the optical film is preferably 1000 to 4000 mm from the viewpoint of use in a large liquid crystal display device, use efficiency of the film during polarizing plate processing, and production efficiency.
- the film thickness is preferably 30 to 90 ⁇ m from the viewpoint of thinning the liquid crystal display device and stabilizing the production of the film. Further, if the conventional optical film manufacturing apparatus has a film thickness of 30 to 50 ⁇ m, which is likely to cause problems such as film breakage, the optical film manufacturing apparatus according to the first embodiment has a problem. An optical film can be produced while suppressing the occurrence of.
- the film thickness is an average film thickness. The thickness is measured at 20 to 200 locations in the width direction of the film with a contact-type film thickness meter manufactured by Mitutoyo Corporation, and the average value of the measured values is calculated. Shown as film thickness.
- the transparent resin used in the first embodiment is not particularly limited as long as it is a resin having transparency when formed into a substrate by a solution casting film forming method or the like. It is preferable that the production by the method is easy, the adhesiveness with the hard coat layer and the like is excellent, the optically isotropic property, and the like.
- the transparency means that the visible light transmittance is 60% or more, preferably 80% or more, and more preferably 90% or more.
- the transparent resin include cellulose ester resins such as cellulose triacetate resin.
- the dope used in the first embodiment may contain fine particles.
- the fine particles to be used are appropriately selected according to the purpose of use, but are preferably fine particles that can scatter visible light when contained in a transparent resin.
- the fine particles may be inorganic fine particles such as silicon oxide or organic fine particles such as acrylic resin.
- a solvent containing a good solvent for the transparent resin can be used, and a poor solvent may be contained as long as the transparent resin does not precipitate.
- the good solvent for the cellulose ester resin include organic halogen compounds such as methylene chloride.
- Examples of the poor solvent for the cellulose ester resin include alcohols having 1 to 8 carbon atoms such as methanol.
- the resin solution used in the first embodiment may contain other components (additives) other than the transparent resin, fine particles and solvent as long as the effects of the present invention are not impaired.
- examples of the additive include a plasticizer, an antioxidant, an ultraviolet absorber, a heat stabilizer, a conductive substance, a flame retardant, a lubricant, and a matting agent.
- a cellulose ester resin solution can be obtained by mixing the above-mentioned compositions.
- the obtained cellulose ester resin solution is preferably filtered using a suitable filter medium such as filter paper.
- melt casting method Next, a case where an optical film is manufactured by a melt casting film forming method (second embodiment) will be described.
- the method for producing an optical film according to the second embodiment includes a casting step of casting a resin melt obtained by melting a transparent resin on a traveling support to form a casting film, and the casting film.
- a cooling process for forming a film by cooling the film, a peeling process for peeling the film from the support, and a stretching process for stretching the film by transporting the peeled film with a plurality of transport rollers In such a melt casting film forming method, an embossed portion forming step is performed between the peeling step and the stretching step.
- it is performed by an optical film manufacturing apparatus as shown in FIG.
- the optical film manufacturing apparatus is not particularly limited to the one shown in FIG. 2 as long as it performs the above-described steps, and may have other configurations.
- the film means a film after a cast film (web) made of a dope cast on a support is dried on the support and can be peeled off from the support.
- FIG. 2 is a schematic diagram showing a basic configuration of an optical film manufacturing apparatus 21 by a melt casting film forming method.
- the optical film manufacturing apparatus 21 includes a first cooling roller 22, a casting die 23, a touch roller 24, a second cooling roller 25, a third cooling roller 26, a peeling roller 27, an embossed part forming device 28, a conveying roller 29, and stretching.
- a device 30 and a winding device 31 are provided.
- the casting die 23 casts a resin melt (dope) obtained by melting a transparent resin onto the surface of the first cooling roller 22.
- the first cooling roller 22 forms a casting film made of dope cast from the casting die 23, cools the casting film while transporting it, and transports the casting film to the second cooling roller 25.
- the thickness of the cast film is adjusted and the surface is smoothed by the touch roller 24 provided in contact with the first cooling roller 22.
- the second cooling roller 25 cools the cast film while transporting the cast film, and transports the cast film to the third cooling roller 26. By so doing, the cast film is used as a film.
- the peeling roller 27 peels the film from the third cooling roller 26.
- the embossed part forming device 28 forms an embossed part at the end of the peeled film.
- the transport roller 29 extends in the MD direction while transporting the film on which the embossed portion is formed.
- the stretching device 30 stretches the film in the TD direction.
- the winding device 31 winds the cooled and solidified film into a film roll.
- the casting die 23 has the same configuration as the casting die 13 except that a resin melt is discharged as a dope instead of the resin solution.
- the first cooling roller 22, the second cooling roller 25, and the third cooling roller 26 are metal rollers having a mirror surface.
- a roller made of stainless steel or the like is preferably used from the viewpoint of peelability of a cast film or a film.
- the width of the cast film cast by the casting die 23, the transport speed of the cast film by the first cooling roller 22, the second cooling roller 25, and the third cooling roller 26 are the same as in the first embodiment. It is.
- the touch roller 24 has an elastic surface, is deformed along the surface of the first cooling roller 22 by a pressing force to the first cooling roller 22, and between the first cooling roller 22, Form a nip.
- the touch roller 24 can be used without particular limitation as long as it is a touch roller conventionally used in the melt casting film forming method. Specifically, the thing made from stainless steel is mentioned, for example.
- the peeling roller 27 is in contact with the third cooling roller 26, and the film is peeled by pressurization.
- the embossed part forming apparatus 28 may be the same as the embossed part forming apparatus 16 in the first embodiment. By forming the embossed portion here, the occurrence of scratches on the film during conveyance by the conveyance roller 29 is suppressed.
- the transport roller 29 is composed of a plurality of transport rollers, and can be stretched in the MD direction of the film by setting a different rotational speed for each transport roller. Such a transport roller 29 is likely to slip between each transport roller and the film, and when the transportability of the film is low, scratches or the like are likely to occur. However, in this embodiment, the transportability of the film is high. The occurrence of scratches is suppressed.
- the stretching device 30 and the winding device 31 may be the same as the stretching device 15 and the winding device 18 in the first embodiment.
- the transparent resin used in the second embodiment can be the same as the transparent resin in the first embodiment as long as it can be heated and melted.
- the same composition as in the first embodiment can be used for other compositions.
- an optical film manufacturing method in which another functional layer such as an antireflection layer is provided on a film substrate may be used.
- the film substrate can be used without any particular limitation, and may be, for example, an optical film manufactured according to the first embodiment and the second embodiment, or a conventional solution casting film forming method and melt casting. It may be a film manufactured by a film forming method or the like.
- An embossed portion forming step is performed after the layer forming step.
- it is performed by an optical film manufacturing apparatus as shown in FIG.
- an optical film manufacturing apparatus it is not limited to what is shown in FIG. 3, The thing of another structure may be sufficient.
- FIG. 3 is a schematic diagram showing a basic configuration of the optical film manufacturing apparatus 41.
- the optical film manufacturing apparatus 41 includes an unwinding apparatus 42, a coating apparatus 43, a drying apparatus 44, a curing apparatus 45, an embossed part forming apparatus 46, a conveying apparatus 47, a winding apparatus 48, and the like.
- the unwinding device 42 supplies the film base material to the coating device 43 and the like.
- the unwinding device 42 includes, for example, an unwinding roller wound so that the film substrate can be unwound, and rotates the unwinding roller to supply the film substrate to the coating device 43 and the like. is there.
- the coating device 43 applies a liquid resin composition onto the surface of the film substrate supplied from the unwinding device 42.
- the coating device 43 can use a general coating device without limitation. For example, an extrusion method, a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a rod coating method, a gravure coating method, and an inkjet method. And the like.
- a plurality of layers are applied and formed on a film substrate, it may be applied simultaneously with a single application device such as an extrusion die having a multi-manifold, or an application for applying one layer.
- a plurality of apparatuses may be arranged side by side and applied sequentially.
- the step of applying the liquid resin composition by the applying device 43 corresponds to the applying step.
- the drying device 44 dries the liquid resin composition applied on the film substrate.
- the drying device 44 may employ, for example, a convection drying method using hot air, a radiant drying method using radiant heat such as infrared rays, or the like. Note that the drying device 44 may not be completely dried.
- the curing device 45 cures the liquid resin composition applied on the film substrate.
- the curing device 45 differs depending on whether the liquid resin composition contains an active ray curable resin such as an ultraviolet curable resin or an electron beam curable resin or a thermosetting resin.
- an actinic radiation irradiation apparatus such as an ultraviolet irradiation apparatus can be used.
- a thermosetting resin a heat treatment apparatus is mentioned.
- the embossed part forming apparatus 46 may be the same as the embossed part forming apparatus 16 in the first embodiment.
- the surface on which the embossed portion is formed may be the side on which the resin composition is applied, or the side on which the embossed portion is not applied. Moreover, both sides may be sufficient.
- the conveying device 47 includes a plurality of conveying rollers. Even when the film is transported by such a transport device, the embossed portion is formed, so that the film can be prevented from being scratched due to sliding on the transport roller.
- the winding device 48 winds up the optical film obtained as described above.
- the winding device 48 includes, for example, a rotatable winding roller, and is a device that winds the optical film by rotating the winding roller.
- Example A In Example A, the influence of the type of the embossed part forming apparatus was examined in the solution casting film forming method of the first embodiment.
- the temperature of the obtained dope was adjusted to 35 ° C., and the temperature of the endless belt support was adjusted to 25 ° C. Then, using an optical film manufacturing apparatus as shown in FIG. 1, the dope was cast from an casting die onto an endless belt support at a conveyance speed of 60 m / min. By doing so, a web was formed on the endless belt support and conveyed while drying. Then, the web was peeled off as a film from the endless belt support, and the peeled film was stretched while holding both ends of the film with clips using a stretching device (tenter). And the area
- an embossed portion having a width of 30 mm was formed at both ends of the film by each of the following embossed portion forming apparatuses (laser processing, inkjet method, and hot embossing). And after conveying with the conveyance roller in the drying apparatus heated at 120 degreeC, the embossed part was cut
- Example 1 (Laser processing) Using a CO 2 laser light irradiation device (wavelength 10.6 ⁇ m, laser light output 60 W), laser light was irradiated to both ends of the film.
- the product subjected to such laser processing was referred to as Example 1.
- Example 2 A liquid having the same composition as the dope was discharged to both ends of the film using an ink jet apparatus (having a nozzle of ⁇ 100 ⁇ m) and dried. The embossed portion thus formed was taken as Example 2.
- Example 1 After being transported by the height A ( ⁇ m) of the convex portion immediately after forming the embossed portion of the optical film (Examples 1 and 2 and Comparative Example 1) obtained as described above and the transport roller in the drying device.
- the height B ( ⁇ m) of the protrusions was measured, and the following evaluation (scratch evaluation) was performed. The results are shown in Table 1.
- Example B In Example B, a film was produced in the same manner as in Example A, and after the 50 mm width at both ends of the film was locally heated to a predetermined temperature, an embossed portion with a width of 30 mm was formed at both ends of the film by laser processing. did. And after conveying with the conveyance roller in the drying apparatus heated at 120 degreeC, the embossed part was cut
- Example C In Example C, the influence of the type of the embossed part forming apparatus was examined in the melt casting film forming method of the second embodiment.
- cellulose acetate propione resin (acetyl group substitution degree: 1.5, propionyl group substitution degree: 1.0, total acyl group substitution degree: 2.5) was used as a transparent resin, and this resin was melted. Was used as a resin melt (dope).
- a film (cellulose acetate propionate film) was produced as follows.
- a dope was cast from a casting die to a first cooling roller having a conveyance speed of 40 m / min with a width of 1400 mm. And the surface was smoothed with the touch roller, and it was made to cool and solidify, conveying with the 2nd cooling roller and the 3rd cooling roller. Then, the cooled and solidified film is peeled off from the third cooling roller, and an embossed portion having a width of 30 mm is formed on both ends of the peeled film by the following embossed portion forming devices (laser processing, ink jet method, and hot embossing). It was.
- embossed portion forming devices laser processing, ink jet method, and hot embossing
- the film was stretched in the MD direction by a plurality of transport rollers, and then the film was stretched in the TD direction while holding both ends of the film with clips using a stretching device (tenter). And the area
- the obtained film was wound up to 4000 m length.
- Example 3 (Laser processing) Using a CO 2 laser light irradiation device (wavelength 10.6 ⁇ m, laser light output 60 W), laser light was irradiated to both ends of the film.
- the product subjected to such laser processing was referred to as Example 3.
- Example 4 A liquid having the same composition as the dope used in the solution casting film forming method was discharged to both ends of the film using an ink jet apparatus (having a nozzle of ⁇ 100 ⁇ m) and dried.
- the embossed portion formed in this way was designated as Example 4.
- Comparative Example 2 was obtained by applying processing (hot embossing) with a stamping roller to both surfaces of the film.
- Example 3 After being transported by the height A ( ⁇ m) of the convex portion immediately after forming the embossed portion of the optical film (Examples 3 and 4 and Comparative Example 2) obtained as described above and the transport roller in the drying device.
- the height B ( ⁇ m) of the protrusions was measured, and the following evaluation (retardation evaluation) was performed. The results are shown in Table 3.
- a three-dimensional refractive index measurement is performed at a wavelength of 590 nm to obtain refractive indexes nx, ny, and nz.
- ⁇ The difference in the thickness direction retardation Rth between the central part and the point from the central part to the end is 600 nm or less.
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Abstract
Description
まず、溶液流延製膜法によって光学フィルムを製造する場合(第1実施形態)について説明する。
次に、溶融流延製膜法によって光学フィルムを製造する場合(第2実施形態)について説明する。
実施例Aでは、第1実施形態の溶液流延製膜法において、エンボス部形成装置の種類の影響について検討した。
まず、メチレンクロライド400質量部及びエタノール45質量部を入れた溶解タンクに、透明性樹脂としてセルロースアセテートプロピオーネ樹脂(アセチル基置換度:1.5、プロピオニル基置換度:1.0、総アシル基置換度:2.5)100質量部を添加し、さらに、トリフェニルホスフェート5.5質量部及びエチルフタリルエチルグリコール5.5質量部を添加した。そして、液温が80℃になるまで昇温させた後、3時間攪拌した。そうすることによって、セルロースアセテートプロピオーネ樹脂溶液が得られた。その後、攪拌を終了し、液温が43℃になるまで放置した。そして、得られた樹脂溶液を、濾過精度0.005mmの濾紙を使用して濾過した。濾過後の樹脂溶液を一晩放置することにより、樹脂溶液中の気泡を脱泡させた。このようにして得られた樹脂溶液を、ドープとして使用して、以下のように、フィルム(セルロースアセテートプロピオネートフィルム)を製造した。
まず、得られたドープの温度を35℃に、無端ベルト支持体の温度を25℃に調整した。そして、図1に示すような光学フィルムの製造装置を用い、流延ダイから搬送速度60m/分の無端ベルト支持体にドープを流延した。そうすることによって、無端ベルト支持体上にウェブを形成し、乾燥させながら搬送した。そして、無端ベルト支持体からウェブをフィルムとして剥離し、剥離したフィルムを延伸装置(テンター)を用いて、フィルムの両端をクリップで把持しながら延伸した。そして、クリップで把持されていた領域を切断して、幅1500mmのフィルムを得た。
CO2レーザ光照射装置(波長10.6μm、レーザ光出力60W)を用いて、レーザ光をフィルム両端部に照射した。このようなレーザ加工を施したものを、実施例1とした。
インクジェット装置(φ100μmのノズルを備えるもの)を用いて、上記ドープと同組成の液体をフィルム両端部に吐出し、乾燥させた。このようにしてエンボス部を形成させたものを、実施例2とした。
フィルムを搬送させながら、噛み合わせ式の刻印ローラでフィルム両端部を挟み込んだ。このようにしてフィルムの両面に刻印ローラによる加工(ホットエンボス加工)を施したものを、比較例1とした。
巻き取ったフィルムを100本作製し、目視によって擦り傷を確認し、以下の基準で評価した。
実施例Bでは、実施例Aと同様の手法でフィルムを製造し、フィルム両端部の幅50mmを局所的に所定温度に加熱した後、レーザ加工によって、フィルム両端部に幅30mmのエンボス部を形成した。そして、120℃に加熱した乾燥装置内の搬送ローラで搬送した後、エンボス部を切断した。得られたフィルムを4000m長に巻き取った。
レーザ光照射直前のフィルムの温度を、30℃、40℃、150℃、160℃に変化させながら、CO2レーザ光照射装置(波長10.6μm、レーザ光出力60W)を用いて、レーザ光をフィルム両端部に照射した。なお、フィルムの温度が150℃、160℃のときは、レーザ光照射装置に、温度を40℃以下に調節する設備を取り付けた。
<フィルム変形>
○:フィルム端部の変形が1mm以上。
◎:フィルム端部の変形が1mm以下。
実施例Cでは、第2実施形態の溶融流延製膜法において、エンボス部形成装置の種類の影響について検討した。
まず、透明性樹脂としてセルロースアセテートプロピオーネ樹脂(アセチル基置換度:1.5、プロピオニル基置換度:1.0、総アシル基置換度:2.5)を用い、この樹脂を溶融させたものを樹脂溶融液(ドープ)として用いた。このようにして得られたドープを使用して、以下のように、フィルム(セルロースアセテートプロピオネートフィルム)を製造した。
まず、図2に示すような光学フィルムの製造装置を用い、流延ダイから搬送速度40m/分の第1冷却ローラに幅1400mmでドープを流延した。そして、タッチローラで表面を平滑化させ、第2冷却ローラ、第3冷却ローラと搬送ながら、冷却固化させた。そして、冷却固化したフィルムを第3冷却ローラから剥離し、剥離したフィルムの両端部に幅30mmのエンボス部を下記の各エンボス部形成装置(レーザ加工、インクジェット方式、及びホットエンボス加工)によって形成させた。
CO2レーザ光照射装置(波長10.6μm、レーザ光出力60W)を用いて、レーザ光をフィルム両端部に照射した。このようなレーザ加工を施したものを、実施例3とした。
インクジェット装置(φ100μmのノズルを備えるもの)を用いて、上記溶液流延製膜法で使用したドープと同組成の液体をフィルム両端部に吐出し、乾燥させた。このようにしてエンボス部を形成させたものを、実施例4とした。
フィルムを搬送させながら、噛み合わせ式の刻印ローラでフィルム両端部を挟み込んだ。このようにしてフィルムの両面に刻印ローラによる加工(ホットエンボス加工)を施したものを、比較例2とした。
MD方向の延伸をさせた直後のフィルムの中央部と中央部から端部にむかって600mmの地点との厚み方向リタデーションRthを以下のようにして、それぞれ測定した。
12 無端ベルト支持体
13,23 流延ダイ
14,27 剥離ローラ
15,30 延伸装置
16,28,46 エンボス部形成装置
17,44 乾燥装置
18,31,48 巻取装置
22 第1冷却ローラ
24 タッチローラ
25 第2冷却ローラ
26 第2冷却ローラ
29 搬送ローラ
42 巻出装置
43 塗布装置
45 硬化装置
47 搬送装置
111 フィルム
113 エンボス部
113a 凹部(第1凹部)
113b 凸部
113c 第2凹部
115 穴
Claims (8)
- フィルムの搬送方向に垂直な方向の少なくとも一方の端部に、複数の凸部を有する帯状のエンボス部を形成させるエンボス部形成工程を備え、
前記エンボス部形成工程が、前記フィルムの搬送中に非接触方式で前記エンボス部を形成させることを特徴とする光学フィルムの製造方法。 - 透明性樹脂を含有する樹脂溶液を、走行する支持体上に流延してフィルムを形成する流延工程と、
前記フィルムを前記支持体から剥離する剥離工程と、
剥離したフィルムを複数の搬送ローラで搬送させることによって、前記フィルムを乾燥させる乾燥工程とを備え、
前記エンボス部形成工程が、前記剥離工程と前記乾燥工程との間に行われることを特徴とする請求項1に記載の光学フィルムの製造方法。 - 透明性樹脂を溶融させた樹脂溶融液を、走行する支持体上に流延して流延膜を形成する流延工程と、
前記流延膜を冷却させてフィルムを形成する冷却工程と、
前記フィルムを前記支持体から剥離する剥離工程と、
剥離したフィルムを複数の搬送ローラで搬送させることによって、前記フィルムを延伸させる延伸工程とを備え、
前記エンボス部形成工程が、前記剥離工程と前記延伸工程との間に行われることを特徴とする請求項1に記載の光学フィルムの製造方法。 - 前記エンボス部を形成した直後の前記凸部の高さに対する、前記エンボス部を形成させたフィルムを搬送ローラで搬送させ巻き取り前の前記凸部の高さの比率が、50~90%であって、搬送させ巻き取り前の前記凸部の高さが、10μm以上であることを特徴とする請求項1から3のいずれか1項に記載の光学フィルムの製造方法。
- 前記エンボス部形成工程が、前記エンボス部を形成させる前のフィルムに対してレーザ光を照射することによって、前記エンボス部を形成させる工程であることを特徴とする請求項1から4のいずれか1項に記載の光学フィルムの製造方法。
- 前記エンボス部形成工程が、前記フィルムの搬送中に、レーザ光の照射位置を移動させることを特徴とする請求項5に記載の光学フィルムの製造方法。
- 前記エンボス部形成工程が、エンボス部を形成させるための液状の材料をインクジェット方式で塗布することにより、エンボス部を形成させることを特徴とする請求項1から4のいずれか1項に記載の光学フィルムの製造方法。
- 請求項1から7のいずれか1項に記載の光学フィルムの製造方法によって得られることを特徴とする光学フィルム。
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KR20220160605A (ko) | 2020-03-31 | 2022-12-06 | 도요보 가부시키가이샤 | 널 가공이 실시된 장척상 수지 필름 |
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