KR20200018206A - Film coating method - Google Patents

Abstract

According to an embodiment of the present invention, the present invention relates to a film coating method. To this end, a base film connected to a lead film by a joint unit is supplied by a roller. A coating gap of a slot die from a surface of the lead film or the base film is placed higher than a step height by the joint unit. The composition is continuously coated by the slot die from the lead film to the base film to form a coating layer. Therefore, the cost-efficiency of a coating process can be improved.

Description

Film Coating Method {FILM COATING METHOD}

The present invention relates to a film coating method. More specifically, the present invention relates to a film coating method using a roll method.

For example, in an image display device such as a liquid crystal display (LCD) device or an organic light emitting display (OLED) device, various functional members such as a touch sensor and a polarizing film may be inserted. .

As the image display apparatus is thinned, the functional member is also manufactured in a thinned film type. For example, functional layers such as an adhesive layer and a protective layer may be formed on a base film through a film coating process by a roll-to-roll method.

In order to improve the process yield, a plurality of the base films need to be connected to each other to perform a coating process continuously. Accordingly, a joint part for connecting the base films may be formed, and in this case, a step (height difference) by the joint part may be generated.

Due to the step, a loss area in which the coating process is interrupted may be generated, thereby reducing process cost and efficiency, and it may be difficult to implement a continuous coating process.

For example, Korean Patent No. 10-1803468 discloses a roll-lamination apparatus for adhesive coating. However, it is not recognized that the coating process stops due to the film step described above.

Korea Patent Registration No. 10-1803468

One object of the present invention is to provide a film coating method having improved reliability and efficiency.

One object of the present invention is to provide an optical film manufacturing apparatus having improved reliability and efficiency.

1. supplying a base film connected to the lead film and the joint through a roller; Disposing a coating gap of a slot die from the surface of the lead film or the base film higher than the step height by the seam; And coating the composition through the slot die continuously from the lead film to the base film to form a coating layer.

2. according to the above 1, wherein the lead film comprises a first lead film connected to the base film of the front end of the coating progress direction and a second lead film connected to the base film of the distal end of the coating progress direction, .

3. In the above 2, wherein the joint comprises a first joint connecting the base film of the first lead film and the front end portion, and a third joint connecting the base film of the second lead film and the end portion , Film coating method.

4. In the above 1, the step of forming the coating layer,

Coating the composition continuously over the base film of the first lead film, the first joint and the front end; And coating the composition continuously over the distal base film, the third joint and the second lead film.

5. according to the above 1, a plurality of the base film is provided is connected through the second joint, the film coating method.

6. In the above 5, wherein the forming the coating layer comprises the step of coating the composition continuously over the base film and the second joint, the film coating method.

7. In the above 1, comprising the step of exposing the coating layer using a filter that blocks the light of 300nm or less, film coating method.

8. The method of 1 above, further comprising the step of preventing the separation of the base film by using a blocking roller spaced apart at a predetermined height in the vertical direction from the base film or the coating layer, the film coating method.

9. forming a coating layer on the base film; And exposing the coating layer using a filter that blocks light having a wavelength of 300 nm or less.

10. In the above 9, wherein the coating layer comprises a liquid crystal composition, the film coating method.

11. Feed roller for feeding the film; A transfer roller positioned on a lower surface side of the film to move the film; And a blocking roller spaced apart at a predetermined height in a vertical direction from an upper surface of the film.

12. In the above 11, wherein the surface of the blocking roller comprises a nylon or stainless steel, optical film manufacturing apparatus.

13. In the above 11, further comprising a motor unit for rotating the blocking roller, optical film manufacturing apparatus.

14. The optical film manufacturing apparatus of the above 11, wherein the blocking roller faces the transfer roller in a direction perpendicular to the upper surface of the film.

15. In the above 11, the transfer roller support portion coupled to the transfer roller; A blocking roller support unit coupled to the blocking roller; And a coupling part connecting the transfer roller support part and the blocking roller support part.

16. In the above 15, further comprising a shaft coupled to the blocking roller, the shaft formed in the hole formed in the blocking roller support portion to be movable in the width direction of the film connecting the blocking roller and the blocking roller support, Optical film manufacturing apparatus.

17. The optical film manufacturing apparatus of 15 above, wherein the blocking roller support part includes a vertical long hole, and the coupling part is inserted to be movable in the vertical long hole to connect the blocking roller support part and the transfer roller support part.

18. The optical film manufacturing apparatus of the above 17, wherein the height of the blocking roller is adjusted by the movement in the vertical long hole of the coupling portion.

19. The apparatus of claim 11, further comprising a slot die coating the optical layer on the film surface.

20. The apparatus according to the above 19, wherein the optical layer includes at least one selected from the group consisting of an adhesive layer, a protective film layer, a hard coating layer, and a liquid crystal layer.

According to embodiments of the present invention, the joint portion connecting the plurality of base films may be formed of a thin tape to increase the coating gap of the slot die than the height of the step portion of the joint portion. Therefore, it is possible to continuously perform a plurality of base films without the need to interrupt the coating process by the step.

In addition, the coating process using the slot die may be performed without a loss area for the entire area of the base film, starting from the lead film connected to the base film of the front end. Thus, the cost efficiency of the coating process can be improved.

Optical film manufacturing apparatus according to embodiments of the present invention by placing a blocking roller to prevent the generation of curl (Curl) of the film on the film upper surface, it is possible to prevent the generation of curl on the film even if the film is deformed by heat Can be.

1 and 2 are schematic diagrams for explaining a film coating method according to exemplary embodiments.
3 to 5 are schematic cross-sectional views illustrating a coating layer formed according to exemplary embodiments.
6 is a schematic diagram for explaining an exposure process of a coating layer formed according to exemplary embodiments.
7 is a schematic diagram illustrating a method for evaluating whether deterioration occurs according to a wavelength of light exposed on a coating layer.
8 and 9 are photographs showing the results of evaluating the liquid crystal polarization layers formed according to the exemplary embodiments, respectively, according to the method of FIG. 7.
FIG. 10 is a graph comparing optical performance of a liquid crystal polarizer formed using a filter and a liquid crystal polarizer formed without a filter according to exemplary embodiments.
11 and 12 are schematic cross-sectional views and plan views for explaining a film coating method according to a comparative example, respectively.
13 is an image for explaining the actual process execution in the film coating equipment of the comparative example.
14 and 15 are schematic schematic diagrams illustrating an optical film manufacturing apparatus according to exemplary embodiments.
16 is an image illustrating a state of an optical film manufacturing apparatus according to an exemplary embodiment.
17 is a schematic view for explaining a method of adjusting the height between the film and the blocking roller according to the exemplary embodiments.

According to embodiments of the present invention, there is provided a film coating method utilizing a slot die for forming an adhesive layer, a protective film, and the like on base films connected by seams.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the following drawings attached to the present specification are intended to illustrate preferred embodiments of the present invention, and together with the contents of the present invention serves to further understand the technical spirit of the present invention, the present invention described in such drawings It should not be construed as limited to matters.

1 and 2 are schematic diagrams for explaining a film coating method according to exemplary embodiments.

Referring to FIG. 1, the substrate film 100 may be moved using a roller, and a coating process for forming a coating layer on the surface of the substrate film 100 may be performed through the slot die 180.

For example, the base film 100 may be supplied along the advancing direction indicated by the arrow toward the slot die 180 while being wound on the feed roller 50.

In one embodiment, a tensile force is applied to the base film 100 through the transfer roller 60, the base film 100 can be moved from the supply roller 50.

The slot die 180 may be disposed between the feed roller 50 and the transfer roller 60 to perform the coating process. The composition in the form of a liquid for forming a coating layer is stored in the slot die 180, and the composition may be sprayed toward the surface of the base film 100 through an outlet of the slot die 180 to form the coating layer. For example, the coating process may be performed in a direction opposite to the film advancing direction shown in FIG. 1.

The base film 100 may be provided as a base layer for forming an optical film, for example, a sensor film such as a touch sensor, a polarizing plate, a retardation film, or the like. For example, the base film 100 is a cyclic olefin polymer (COP), polyethylene terephthalate (PET), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide ( PPS), polyallylate, polyimide (PI), cellulose acetate propionate (CAP), polyethersulfone (PES), cellulose triacetate (TAC), polycarbonate (PC), cyclic olefin copolymer ( COC), polymethylmethacrylate (PMMA), and the like.

The composition ejected from the slot die 180 may be, for example, an adhesive composition such as a pressure sensitive adhesive (PSA), an optically clear adhesive (OCA), or the like, or a resin for forming a protective film. The composition, a hard coat (Hard Coat) composition, the liquid crystal phase difference or a liquid crystal composition for forming a liquid crystal optical layer may be included.

According to exemplary embodiments, the plurality of base films 100 may be connected through the joint 130 to implement the continuous film coating process, and the coating process may be performed.

Referring to FIG. 2, the first lead film 110 is a first joint of a plurality of base films 100 at a front end portion of one base film 100 (eg, the first base film on which the coating process is started). It may be connected through the unit 132. The first lead film 110 may be included as a dummy film which is inserted in consideration of a process tolerance and applies an initial tensile force for the movement of the base film 100.

For example, a relatively low cost film such as PET may be used as the first lead film 110 that is cut and discarded after completion of the coating process.

The joint 130 including the first joint 132 may be formed using a thin tape to form a thin thickness in consideration of the coating gap of the slot die 180 as described below.

A step is generated between the surface of the base film 100 (or the upper surface of the first lead film 110) and the upper surface of the first joint portion 132 by the first joint portion 132. H2) can be caused.

According to example embodiments, the slot die 180 may be arranged to have a coating gap H1 greater than the step height H1. The coating gap H1 may be a vertical height between the upper surface of the base film 100 or the first lead film 110 and the discharge hole (eg, Slot Die Lip) of the slot die 180.

According to exemplary embodiments, the coating of the composition through the slot die 180 may start from the first lead film 110 along the coating progress direction indicated by the arrow in FIG. 2 and proceed to the base film 100. . For example, the coating may be started from an intermediate point of the upper surface of the lead film 110 and the coating may be continuously performed toward the base film 100.

As described above, since the coating gap 180 of the slot die 180 is larger than the step height H2 by the first joint 132, the coating gap 180 is continuously coated without stopping the coating due to the step of the joint 132. This can be done.

For example, the step height H2 may be about 5 to 40 μm, and the height of the coating gap H1 may range from about 50 to 150 μm in view of the composition spraying efficiency.

3 to 5 are schematic cross-sectional views illustrating a coating layer formed according to exemplary embodiments.

Referring to FIG. 3, as described with reference to FIGS. 1 and 2, the coating of the composition is started from the first lead film 110 through the slot die 180, so that the first joint 132 and the base film 100 may be started. The coating can be carried out continuously).

Accordingly, for example, the coating layer 140 continuously extending from the intermediate point of the first lead film 110 to the base film 100 beyond the first joint 132 may be formed.

Referring to FIG. 4, the plurality of base films 100 may be connected through the second joint part 134 and supplied through the above-described roller. As described above, since the coating gap H1 of the slot coating die 180 can be maintained higher than the step height by the second joint 134, the coating gap H1 can be maintained continuously without stopping the coating by the second joint 134. An extended coating layer 140 may be formed.

In one embodiment, the coating process may be stopped to attach the base films 100 by the second joint 134. Even in this case, since the coating gap H1 is kept higher than the step height, the starting position of the subsequent coating process can be freely adjusted. Accordingly, the size of the loss region (for example, the region where the coating layer 140 is not formed on the surface of the base film 100) due to the coating process may be significantly reduced.

Referring to FIG. 5, the base film 100 disposed in the distal end portion of the coating progress direction may be connected through the second lead film 115 and the third joint portion 136.

According to exemplary embodiments, the coating process through the slot die 180 may be performed beyond the base film 100 and the third joint portion 136 of the distal end to the top surface of the second lead film 115. .

Therefore, the coating layer 140 may be formed by utilizing substantially the entire area of the surface of the base film 100 of the distal end.

1 to 5 illustrate a single-side coating process for forming a coating layer on one surface of the base film 100 for convenience of description, but the above-described implementation is also performed on the double-side coating process in which the coating layer is applied to the top and bottom surfaces of the base film 100. The film coating method according to the examples can be applied.

6 is a schematic diagram for describing an exposure process of the coating layer 140 formed according to an exemplary embodiment.

In some embodiments, the film coating process may further include exposing the coating layer 140 using a filter 300 that blocks light having a wavelength of 300 nm or less.

For example, the liquid crystal optical layer may be formed by curing the coating layer 140 by the exposure process. For example, the liquid crystal optical layer may be a liquid crystal polarizing layer.

As shown in FIG. 6, the filter 300 may be installed between the light source 400 and the coating layer 140 to block light having a wavelength of 300 nm or less among the light emitted from the light source 400.

Accordingly, the high energy light may be prevented from reaching the coating layer 140, and thus the optical performance of the liquid crystal optical layer formed by curing the coating layer 140 may be prevented from deteriorating.

For example, when the liquid crystal optical layer is formed by the exposure process, the light source 400 may be a high pressure mercury lamp or a Xenon lamp.

For example, when the liquid crystal optical layer is formed by the exposure process, the base film 100 on which the coating layer 140 is formed may be a transparent base film having a transmittance of 80% or more with respect to a wavelength of 380 nm to 780 nm.

For example, the transparent base film may be a cellulose ester such as triacetyl cellulose, diacetyl cellulose or cellulose acetate propionate, but is not limited thereto.

For example, when the liquid crystal optical layer is formed by the exposure process, the coating layer 140 may include a liquid crystal composition.

The liquid crystal composition may include, for example, a polymerizable liquid crystal compound, a dichroic dye, a photopolymerization initiator, and a solvent.

The polymerizable liquid crystal compound refers to a compound having a liquid crystal phase including a mesogen capable of expressing liquid crystal and a terminal group capable of polymerization. For example, the polymerizable liquid crystal compound may be polymerized into a sieve having a liquid crystal phase oriented in a predetermined direction to form a polarizing layer.

The polymerizable liquid crystal compound may be, for example, a polymerizable liquid crystal compound exhibiting a smetic phase. As the Smetic phase, Smatic A phase, Smetic B phase, Smetic D phase, Smetic E phase, Smetic F phase, Smetic G phase, Smetic H phase, Smetic I phase, Smetic J phase or S It may be a mechanical K phase.

The polymerizable liquid crystal compound may be used without limitation as long as it includes a mesogen capable of expressing liquid crystal and a terminal group capable of polymerization, and the polymerizable liquid crystal compound may be a mixture of two or more polymerizable liquid crystal compounds. It may be.

The dichroic dye is intended to have polarization characteristics, and means a dye having a property in which the absorbance in the major axis direction of the molecule and the absorbance in the minor axis direction are different.

For example, the dichroic dye may be used without limitation as long as it is a known dichroic dye having a maximum absorption wavelength at 300 to 700 nm.

The said photoinitiator is a compound which starts the polymerization reaction of a polymeric liquid crystal compound, and means the compound which generate | occur | produces an active radical or an acid by light.

For example, the photopolymerization initiator may be an acetophenone compound, a benzoin compound, a benzophenone compound, a triazine compound, an anthraquinone compound, a thioxanthone compound, or an anthracene compound.

The solvent is for dissolving each component of the liquid crystal composition described above, and any solvent can be used without limitation as long as it is a solvent which is insulative in the polymerization reaction of the polymerizable liquid crystal compound.

For example, the solvent may be an alcohol solvent, an ester solvent, a ketone solvent, an aliphatic hydrocarbon solvent, an aromatic hydrocarbon solvent, a nitrile solvent, an ether solvent, or a chlorine-containing solvent.

When the coating layer 140 includes the liquid crystal composition described above, a liquid crystal polarizing layer may be formed by the exposure process.

In addition, in the exposure process, the coating layer 140 may be cured using the filter 300 that blocks light having a wavelength of 300 nm or less, thereby forming a liquid crystal polarizing layer that is prevented from deterioration due to high energy light.

7 is a schematic diagram illustrating a method for evaluating whether deterioration occurs according to a wavelength of light exposed on a coating layer. 8 and 9 are photographs showing the results of evaluating the liquid crystal polarization layers formed according to the exemplary embodiments, respectively, according to the method of FIG. 7.

Referring to FIG. 7, the coating layer 140 may be formed on the base film 100 according to the above-described coating method. The light emitted from the light source 400 may be dispersed by the dispersion grating 500 and irradiated onto the coating layer 140. The wavelength range of light irradiated onto the coating layer 140 may be about 220 nm to 520 nm.

FIG. 8 is a photograph showing whether deterioration occurs according to a wavelength of the coating layer 140 including Magenta (D128) as a dichroic dye according to the evaluation method of FIG. 7. Referring to the portion indicated by the circle, degradation may occur in the liquid crystal polarization layer formed when the coating layer 140 is cured by light having a wavelength of 300 nm or less.

FIG. 9 is a photograph showing whether deterioration occurs according to a wavelength of the coating layer 140 including orange (OK287) as a dichroic dye according to the evaluation method of FIG. 7. Referring to the portion indicated by the circle, degradation may occur in the liquid crystal polarization layer formed when the coating layer 140 is cured by light having a wavelength of 300 nm or less.

FIG. 10 is a graph comparing transmittance (Py, Ty) of a liquid crystal polarizer formed using the filter and a liquid crystal polarizer formed without using the filter, according to exemplary embodiments.

Referring to FIG. 10, a liquid crystal polarizer (indicated by a square) formed using the filter may have a higher transmittance than a liquid crystal polarizer (indicated by a diamond shape) formed without using the filter.

According to exemplary embodiments, the separation of the base film may be prevented by using a blocking roller disposed spaced apart from the base film or the coating layer by a predetermined height in a vertical direction.

As a result, the blocking roller may prevent the film from being deformed by heat, and thus the film may be separated from the transfer line in a vertical direction. In addition, by preventing the vertical deviation of the film, it is possible to prevent the curl (Curl) is formed on the film.

In addition, the blocking roller is not in direct contact with the upper surface of the film, it can effectively prevent the horizontal deviation (for example, meandering) due to the pressure is not equally transmitted to the upper surface of the film.

For example, the height H at which the upper surface of the film and the blocking roller are spaced apart from each other is not particularly limited, and may be adjusted according to the kind of the film and the degree of curl. For example, the height may be 0.1 cm to 2 cm, but is not limited thereto.

11 and 12 are schematic cross-sectional views and plan views for explaining a film coating method according to a comparative example, respectively. Similar reference numerals are used for configurations corresponding to those described with reference to FIGS. 1 to 5.

Referring to FIG. 11, the first lead film 210 and the base film 200 are connected through the first joint 232, and the coating gap H3 of the slot die 280 is connected to the first joint 232. It may be arranged lower than the step height (H4) by.

In the case of the comparative example, since the coating process is stopped by the step height H4, the coating process is started from the middle region of the base film 200.

Referring to FIG. 12, a second joint portion 234 connecting the base films may be formed, and a third joint portion 236 connecting the base film 200 and the second lead film 215 at the distal end may be formed. Can be.

In the comparative example, since the coating process is stopped by the step height H4 whenever the slot die 280 is close to the joints 232, 234, and 236, the loss region L1 where the formation of the coating layer 240 is stopped. , L2, L3) are generated (e.g., loss in the gap area reaching / forwarding section). Also, each time the coating process is stopped, the flow rate stabilization time of the composition stored in the slot die 280 is required , The widths of the loss areas L1, L2, L3 may be further increased.

As shown in FIG. 12, a first loss region L1 occurs in the base film 200 of the front end portion contacting the first joint portion 232, and the second loss region L1 is disposed on both sides of the second joint portion 234. A lossy area L2 may occur. In addition, a third loss region L3 may occur in the base film 200 of the distal end portion that contacts the third joint portion 236.

13 is an image for explaining the actual process execution in the film coating equipment of the comparative example. Referring to FIG. 13, the loss area described with reference to FIGS. 11 and 12 may be displayed as indicated by an arrow.

However, according to the exemplary embodiments described above, the joint 130 may be formed of a thin film tape so that the coating gap of the slot die 180 may be higher than the step height. Therefore, since the coating process can be performed continuously from the first lead film 110 to the second lead film 115, the loss region in the comparative example can be substantially removed or significantly reduced.

Therefore, it is possible to increase the usable area of the base film 100 and to significantly improve process continuity and efficiency.

14 and 15 are schematic schematic diagrams illustrating an optical film manufacturing apparatus according to exemplary embodiments. 16 is an image illustrating a state of an optical film manufacturing apparatus according to an exemplary embodiment.

In the optical film manufacturing apparatus according to the exemplary embodiments of the present invention, the feed roller 50 for supplying the film 10, the transfer roller 60 positioned on the lower surface side of the film 10 and for moving the film 10. And a blocking roller 70 spaced apart from the upper surface of the film 10 by a predetermined height in a vertical direction.

Accordingly, the optical film manufacturing apparatus can prevent the film 10 from being deviated in the vertical direction even when the film 10 is deformed by the process of drying the film 10 at a high temperature. It is possible to effectively prevent the formation of curl (Curl).

In addition, since the blocking roller 70 is spaced apart from the film 10, unlike the conventional pinch roll, the upper surface of the film 10 and the blocking roller 70 may not be in direct contact. As a result, pressure is not evenly applied on the film 10, and the meandering of the film 10 from the horizontal direction can be effectively prevented.

The surface of the blocking roller 70 in accordance with exemplary embodiments may comprise nylon or stainless-steel.

For example, the nylon may be MC nylon, nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12 or nylon 46.

For example, the stainless steel may be austenitic (SUS 304), ferritic (SUS 430), martensitic (SUS410), ideal (SUS329), or precipitation hardening (SUS630).

Accordingly, durability and chemical resistance of the blocking roller 70 may be excellent, and foreign matter may be prevented from occurring on the film 10, thereby improving optical film manufacturing efficiency and reliability.

In example embodiments, the optical film manufacturing apparatus may further include a motor unit for rotating the blocking roller 70.

For example, the motor unit may rotate the blocking roller 70 in a direction opposite to the rotation direction of the feed roller 60. Accordingly, the film 10 may be prevented from leaving the vertical direction more effectively, and the curl may be more effectively prevented from occurring on the film 10 deformed by heat.

As shown in FIGS. 14 and 15, the blocking roller 70 according to the exemplary embodiments may face the feed roller 60 in a direction perpendicular to the top surface of the film 10.

Accordingly, in the process of conveying the film 10 by the feed roller 60, the film 10 may be prevented from being separated in the vertical direction, thereby effectively preventing curl from occurring on the film 10. have.

As shown in FIG. 15, the optical film manufacturing apparatus according to the exemplary embodiments includes a transfer roller support 84 coupled with a transfer roller 60, a blocking roller support 82 coupled with a blocking roller 70, and It may further include a coupling portion 86 connecting the transfer roller support 84 and the blocking roller support 82.

As shown in FIG. 15, the optical film manufacturing apparatus according to the exemplary embodiments may further include a shaft 80 connecting the blocking roller 70 and the blocking roller support 82.

In some embodiments, as shown in FIG. 15, the shaft 80 may be inserted into the blocking roller 70 to couple the shaft 80 to the blocking roller 70. For example, by further coupling the bolt 85 to the end of the shaft 80, the blocking roller 70 can be fixed to the shaft 80. For example, the shaft 80 to which the blocking roller 70 is coupled may be inserted into the shaft coupling hole of the blocking roller support 82 to connect the blocking roller 70 and the blocking roller support 82.

For example, by adjusting the entire length of the shaft 80, the position where the blocking roller 70 is disposed in the width direction of the film 10 can be appropriately adjusted.

For example, the shaft 80 may be inserted into the shaft coupling hole of the blocking roller support 82 to be movable in the width direction of the film 10.

Accordingly, by moving the shaft 80 in the width direction of the film 10, it is possible to adjust the position where the blocking roller 70 is disposed in the width direction of the film 10. Therefore, regardless of the type and width of the film 10, the optical film manufacturing apparatus can effectively prevent the generation of curl (Curl).

For example, by adjusting the positional relationship between the blocking roller support 82, the transfer roller support 84, and the engaging portion 86, the height H between the film 10 and the blocking roller 70 can be adjusted. have.

17 is a schematic view for explaining a method of adjusting the height between the film and the blocking roller according to the exemplary embodiments.

As illustrated in FIG. 17, the blocking roller support 82 according to the exemplary embodiments may include a vertical long hole 88 formed to extend in a direction parallel to the height H direction. In addition, the coupling portion 86 may be inserted to be movable in the vertical long hole 88 to connect the blocking roller support 82 and the transfer roller support 84.

Referring to FIG. 17, the coupling part 86 may move in the height direction H in the vertical long hole 88. Accordingly, the height H between the film 10 and the blocking roller 70 may be adjusted.

For example, when the engaging portion 86 moves to the lower portion of the vertical long hole 88, the length in the height direction formed by the blocking roller support portion 82 and the transfer roller support portion 84 is increased, so that the film 10 And the height H between the blocking roller 70 can be increased.

For example, when the engaging portion 86 moves to the upper end of the vertical long hole 88, the length in the height direction formed by the blocking roller support portion 82 and the transfer roller support portion 84 is reduced, so that the film 10 and The height H between the blocking rollers 70 can be reduced.

The optical film manufacturing apparatus according to the exemplary embodiments may separate the blocking roller 70 from the blocking roller support 82.

For example, as shown in FIG. 15, by separating the shaft 80 coupled with the shaft engagement hole of the blocking roller support 82 from the blocking roller support 82, the blocking roller 70 is blocked. 82). For example, the blocking roller 70 may be separated from the shaft 80, and the blocking roller 70 may be separated from the blocking roller support 82.

For example, when the blocking roller 70 is fixed to the shaft 80 by the bolt 85, after the bolt 85 is removed from the shaft 80, the blocking roller 70 is separated from the shaft 80. By doing so, the blocking roller 70 can be separated from the blocking roller support part 82. For example, the separated blocking roller 70 may be recombined with the blocking roller support 82.

For example, the blocking roller 70 may be removed from any one position of the optical film manufacturing apparatus, and then placed again at another position that can effectively prevent the occurrence of curl. Accordingly, it is possible to more effectively prevent curl from occurring on the film 10.

As described above, the optical film manufacturing apparatus according to the exemplary embodiments includes a blocking roller 70 spaced apart from the upper surface of the film 10 by a predetermined height, thereby leaving the horizontal and vertical directions of the film 10. Can be effectively prevented.

In the comparative example, the conventional optical film manufacturing apparatus includes the pinch roller which fixes the upper and lower surfaces of a film together, and can prevent a vertical deviation of a film. However, in the pinch roller of the comparative example, when the pressure applied to the film 10 is not constant, horizontal deviation may occur, and meandering of the film 10 may occur.

Referring to FIG. 14, according to exemplary embodiments, the optical film manufacturing apparatus may further include a slot die 180 coating an optical layer on a surface of the film 10.

For example, the slot die 180 includes a coating layer forming composition therein, as described above, and the coating gap H1 of the slot coating die 180 is kept higher than the step height by the joints, so that the coating stops. Continuously extending coating layers can be formed.

For example, the optical layer is not particularly limited, and may include at least one selected from the group consisting of an adhesive layer, a protective film layer, a hard coating layer, and a liquid crystal layer.

The optical film manufacturing apparatus according to the exemplary embodiments of the present invention may include a blocking roller 70 to prevent curl or meandering that may occur during the transport of the film. In addition, the slot die 180 may be further included to form a coating layer extending continuously without stopping the coating.

10: film 50: feeding roller
60: feed roller 70: blocking roller
80: shaft 82: blocking roller branch
84: feed roller support 86: engaging portion
88: vertical long hole 100, 200: base film
110 and 210: first lead film 115 and 215: second lead film
130: joint 132: 232: first joint
134: 234: second joint 136, 236: third joint
180, 280: slot die 140, 240: coating layer
300: filter 400: light source
500: distributed grating L1, L2, L3: loss area
H: Height L: Horizontal Distance

Claims (20)

Supplying a base film connected to a lead film and a joint through a roller;
Disposing a coating gap of a slot die from the surface of the lead film or the base film higher than the step height by the seam; And
Coating the composition through the slot die continuously from the lead film to the base film to form a coating layer.
The method of claim 1, wherein the lead film comprises a first lead film connected to a base film of a front end portion in a coating direction and a second lead film connected to a base film of an end portion of the coating direction.
The film of claim 2, wherein the joint part comprises a first joint part connecting the base film of the first lead film and the front end part, and a third joint part connecting the base film of the second lead film and the distal end part. Coating method.
The method of claim 1, wherein the forming of the coating layer,
Coating the composition continuously over the base film of the first lead film, the first joint and the front end; And
Coating the composition continuously over the distal base film, the third joint and the second lead film.
The method of claim 1, wherein a plurality of the base films are provided in connection with a second joint.
6. The method of claim 5, wherein forming the coating layer comprises coating the composition continuously over the base films and the second joint.
The method of claim 1, comprising exposing the coating layer using a filter that blocks light having a wavelength of 300 nm or less.
The method of claim 1, further comprising preventing separation of the base film by using a blocking roller spaced apart from the base film or the coating layer by a predetermined height in a vertical direction.
Forming a coating layer on the base film; And
And exposing the coating layer using a filter that blocks light having a wavelength of 300 nm or less.
The method of claim 9, wherein the coating layer comprises a liquid crystal composition.
A feed roller for feeding a film;
A transfer roller positioned on a lower surface side of the film to move the film; And
And a blocking roller spaced apart at a predetermined height in a vertical direction from an upper surface of the film.
The apparatus of claim 11, wherein the surface of the blocking roller comprises nylon or stainless steel.
The optical film manufacturing apparatus according to claim 11, further comprising a motor unit for rotating the blocking roller.
The optical film manufacturing apparatus according to claim 11, wherein the blocking roller faces the transfer roller in a direction perpendicular to the upper surface of the film.
The method according to claim 11,
A conveying roller support coupled to the conveying roller;
A blocking roller support unit coupled to the blocking roller; And
The optical film manufacturing apparatus further comprises a coupling part for connecting the transfer roller support and the blocking roller support.
The optical film of claim 15, further comprising a shaft coupled to the blocking roller and inserted into the hole formed in the blocking roller support to move in the width direction of the film to connect the blocking roller and the blocking roller support. Manufacturing device.
The method of claim 15, wherein the blocking roller support portion comprises a vertical long hole,
And the coupling part is inserted to be movable in the vertical slot to connect the blocking roller support part and the transfer roller support part.
The optical film manufacturing apparatus according to claim 17, wherein the height of the blocking roller is adjusted by movement in the vertical long hole of the engaging portion.
The apparatus of claim 11, further comprising a slot die for coating an optical layer on the film surface.
The optical film manufacturing apparatus of claim 19, wherein the optical layer includes at least one selected from the group consisting of an adhesive layer, a protective film layer, a hard coating layer, and a liquid crystal layer.

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