TW201302318A - Coating device - Google Patents

Abstract

The coating device of the present invention is applied in coating the protection coating agent on the roller die for manufacturing the optical film. The device comprises: a coating scraper for making the protection coating agent to flow thereon and guiding the protection coating agent to the aforementioned roller die when the protection coating agent is coated on the roller die inside the device; a pair of plates to define the flowing area of the protection coating agent on the aforementioned coating scraper; a stopping member to keep a specific distance between the roller die and the aforementioned coating scraper; and a rotational mechanism for the roller die to rotate. The aforementioned coating scraper, plates, and stopping member are disposed in the following manner that: when the roller die having a center shaft is disposed with the center shaft as horizontal plane at a specific position inside the device, the aforementioned coating scraper is located above the horizontal plane containing the center shaft of the aforementioned roller die, and extends in parallel with the aforementioned center shaft; and the aforementioned plates are located on the aforementioned coating scraper with their main surfaces facing each other. Furthermore, the distance between the aforementioned roller die and the aforementioned stopping member is shorter than the distance between the aforementioned roller die and the aforementioned coating scraper. The coating device of the present invention is applied in coating the protection coating agent on the roller die for manufacturing the optical film. The device comprises: a coating scraper for making the protection coating agent to flow thereon and guiding the protection coating agent to the aforementioned roller die when the protection coating agent is coated on the roller die inside the device; a pair of plates to define the flowing area of the protection coating agent on the aforementioned coating scraper; a stopping member to keep a specific distance between the roller die and the aforementioned coating scraper; and a rotational mechanism for the roller die to rotate. The aforementioned coating scraper, plates, and stopping member are disposed in the following manner that: when the roller die having a center shaft is disposed with the center shaft as horizontal plane at a specific position inside the device, the aforementioned coating scraper is located above the horizontal plane containing the center shaft of the aforementioned roller die, and extends in parallel with the aforementioned center shaft; and the aforementioned plates are located on the aforementioned coating scraper with their main surfaces facing each other. Furthermore, the distance between the aforementioned roller die and the aforementioned stopping member is shorter than the distance between the aforementioned roller die and the aforementioned coating scraper.

Description

Coating device

The present invention relates to a coating apparatus for applying a protective film agent to a roll mold for producing an optical film.

As a method for producing various optical films such as a diffusion film or an anti-glare film having a fine uneven shape on the surface, it is described that a mold having a shape opposite to a specific fine uneven shape is produced, and the mold is used and subjected to hot embossing or UV ( Ultraviolet, ultraviolet ray, etc. methods (JP2006-53371-A, JP2007-187952-A, JP2007-237541-A). When the optical film is produced by such an embossing method, when the mold is formed into a roll shape, the optical film can be produced in a continuous roll shape, and the mass productivity is excellent.

However, such a roll mold for producing an optical film may be deteriorated on the surface due to rust during storage or adhesion of dirt, impurities, or the like. In the case of producing an optical film using a mold having a surface deterioration as described above, the obtained optical film may cause defects. The defects generated in the optical film may have a periodicity depending on the diameter of the roll film for manufacturing the optical film, so that the mass productivity is remarkably lowered.

In order to prevent rust on the surface of the mold, it is known to store the mold in a state in which the rust preventive oil is applied. However, in the case of applying an rust preventive oil, it is necessary to remove the rust preventive oil, so that the man-hour for removing the rust preventive oil is necessary. Further, in the case where the rust preventive oil cannot be completely removed, there is also a problem that the obtained optical film is defective. Moreover, when the rust preventive oil is removed, there is also a flaw in the mold. Further, in the roll mold for producing an optical film, there is also a problem that it is difficult to apply the rust preventive oil due to restrictions on the functional surface or the like.

When the rust preventive oil cannot be used, a method of storing the mold by vaporizing the rustproof paper is known (JP2001-10679-A). Further, a method in which a roll mold for producing an optical film is placed in a sealed container and the air in the sealed container is replaced with a non-oxidizing gas such as nitrogen, or a roll mold for producing an optical film is placed in a closed container. And the method of keeping it together with the deoxidizer (JPH07-291364-A).

Further, it is known that the substrate is immersed in a rust-preventing agent containing a hydroxylamine-based functional decane coupling agent, and dried to carry out rust-preventing treatment (JP2006-28597-A). Further, as a device for applying a coating liquid to a roll-shaped substrate, a coating device using a coating roll (for example, JP2001-170532-A) is also known.

However, in the case of using vaporized anti-rust paper, there are the following defects: impurities are allowed to enter the anti-rust paper itself or the anti-rust paper and the mold due to the friction with the anti-rust paper during the bale or conveyance. This impurity may damage the surface of the roll film for optical film manufacturing. In JP2006-28597-A, it is preferable to dry the rust preventive agent by heating to 100 ° C or higher, and this drying may affect the accuracy of the fine surface shape of the roll mold for producing an optical film. Further, in the removal of the rust preventive agent, there is a problem that the same problem as the above rust preventive oil is generated. Further, in the method described in JP2001-170532-A, since the coating liquid is attached by rotating the coating roller, there is a problem that the solvent is widely diffused, and there is a problem that coating corresponding to the size of the substrate is difficult.

An object of the present invention is to provide a protective film which can form a uniform thickness and is easily peeled off on the surface of a roll mold for producing an optical film without causing a protective film. A coating device in which the solvent of the agent is excessively diffused.

The invention includes the following.

[1] A coating device for applying a protective film agent to a roll mold for optical film production, the device comprising: a coating blade for applying a protective film agent to a roll mold in the device The protective film agent is flowed thereon and guided onto the roll mold; a pair of flat plates for defining a flow area of the protective film agent on the coating blade; a stopper, the system a member for maintaining a specific distance between the roll mold and the coating blade when the protective film agent is applied to the roll mold in the apparatus; a rotating mechanism for protecting the film agent in the device When the roller die is applied to rotate the roller die; the coating blade, the flat plate, and the stopper are disposed in such a manner that the roller die having the central axis is horizontally formed with the central axis When disposed at a specific position in the device, the coating blade is located above a horizontal plane including a central axis of the roll die, and extends parallel to the central axis; the flat plates are oriented toward each other with one of the main faces On the above coated squeegee And the distance the roller die and the stopper member relatively short distance above the roller coating die of the blade.

[2] The coating device of [1], further comprising: causing the above-mentioned coating blade to be vertically A moving mechanism that moves in a direction and a horizontal direction orthogonal to the central axis.

[3] The coating device of [1] or [2], wherein the coating blade comprises a fluororesin.

[4] The coating apparatus according to any one of [1] to [3] wherein the flat plate is movable in the extending direction of the coating blade.

[5] The coating device according to any one of [1] to [4] wherein the stopper is movable in the extending direction of the coating blade.

[6] The coating apparatus according to any one of [1] to [5] wherein the roll mold is a mold for producing an anti-glare film having a concave-convex shape on its surface.

According to the coating apparatus of the present invention, a protective film having a uniform thickness and easy peeling can be formed on the surface of the roll film for optical film production without excessively diffusing the solvent of the protective film agent without damaging the surface of the roll mold.

Hereinafter, the present invention will be described in detail with reference to the drawings.

<Composition of coating device>

Fig. 1 is a cross-sectional view showing an example of a coating apparatus of the present invention. In the coating device 20 shown in Fig. 1, when the protective film agent is applied, the roll mold 3 for producing an optical film to be coated is disposed such that its central axis is horizontal. The coating device 20 includes a plate-shaped coating blade 2 disposed so as to have a specific distance from the roll die 3, that is, a gap, and a protective film agent (hereinafter sometimes referred to as a coating liquid) is supplied to the coating film. The coating nozzle 1 on the squeegee 2, the roller-shaped driving device 4 for rotating the roller die 3, the rotation control device 5, and the rotation auxiliary roller 6. The rotation mechanism is constituted by the drive device 4, the rotation control device 5, and the rotation assist roller 6. The coating blade 2 is disposed on the water more than the central axis of the roll mold The plane C1 is further above, and is disposed opposite to the outer peripheral surface 3a of the roll mold 3 without contacting the roll mold 3. The coating blade 2 extends in the direction of the central axis of the roll die 3, and the protective film agent is guided from the coating blade 2 to the roll die 3, whereby the surface of the roll die 3 is coated.

Fig. 2 is a plan perspective view showing in detail other components of the periphery of the coating blade 2 of the coating device 20 shown in Fig. 1. As shown in FIG. 2, the coating blade 2 is fixed to the support column 10 via a plurality of fixing members 9. The fixing member 9 is provided with a plurality of pulley-shaped stoppers 8 as members for maintaining a certain distance between the roller die 3 and the coating blade 2. The stopper 8 is fixed in such a manner that the coating blade 2 is located closer to the vicinity of the roller die 3. That is, the distance between the roller die and the stopper is shorter than the distance between the roller die and the coating blade. The moving mechanism (not shown) moves the support column 10 in the horizontal direction in the vertical direction in the vertical direction and in the horizontal direction orthogonal to the central axis C2 of the roll die 3 (the direction indicated by the arrow in Fig. 2). Therefore, the coating blade 2 fixed to the support column 10 is also moved in the same direction. When the coating blade 2 is moved in the direction of approaching the roll die 3 by the moving mechanism, the coating blade 2 is prevented from contacting the roll die 3 when the coating blade 2 is moved by the stopper 8.

The coating blade 2 is provided with one of the flow regions for defining the protective film agent (coating liquid) to the flat plates 7a and 7b (hereinafter, the pair of flat plates 7a and 7b may be referred to as a liquid stopper). The protective film agent can be accumulated on the coating blade 2 by the pair of flat plates 7a and 7b. That is, a pair of flat plates 7a and 7b serves as a reservoir on the coating blade 2. The protective filming agent (coating liquid) is prevented from leaking to the outside of the flat plates 7a, 7b by the liquid stopper.

<Coating method>

In the coating device 20, a protective coating agent (coating liquid) is supplied from the coating nozzle 1 to the coating blade 2, and thereafter, the roller die 3 to be coated is rotated by a rotating mechanism. The protective filming agent (coating liquid) is guided from the coating blade 2 to the roll die 3, whereby the protective film agent on the surface of the roll die 3 is uniformly diffused and naturally dried. When the protective coating agent (coating liquid) is dried, the protective film is formed in close contact with the roll mold 3. The thickness of the protective film can be adjusted by applying a gap between the blade 2 and the roll die 3.

The roll mold 3 is used for producing an optical film, and is used after peeling off the protective film. Therefore, the formed protective film is preferably easily peeled off by hand. Further, it is preferable that the protective film is completely peeled off without leaving a residue or the like. Since the residue or the like is not left, it is not necessary to clean the roll mold 3 after peeling off the protective film.

By using the coating device of the present invention, a protective film having a uniform thickness can be formed, so that the surface of the roll mold can be uniformly protected. Moreover, by appropriately selecting the protective film agent to be used, it is possible to form a protective film which is easily peeled off by hand and which is less likely to cause residue during peeling. Further, since the protective film is formed by drying naturally without heating and drying, there is no possibility of affecting the surface of the roll mold to be coated, and a high-precision roll mold can be provided. Further, since the coating blade is used as the coating mechanism, the diffusion of the solvent of the coating liquid can be suppressed. Hereinafter, each constituent element of the coating apparatus will be described in more detail.

(coating scraper)

The coating blade 2 is used to apply a protective film agent to the roll die 3 in the coating device 20 to cause the protective film agent to flow thereon and to guide the coating blade on the roll die 3. When the roller die 3 having the center axis is horizontally disposed at a specific position in the coating device 20, the coating blade 2 is attached. It is disposed above the horizontal plane including the central axis of the roll die 3 and extends in parallel with the central axis. The material of the coating blade 2 is preferably a material which is not eroded by the protective film agent and which is hard to cause damage even when it is in contact with the roll die 3 as a coating object, and various fluororesins are exemplified (for example, poly Tetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, etc., high density polyethylene, and the like.

The length of the coating blade 2 in the extending direction is preferably equal to or longer than the length of the central axis direction of the roll die 3 to be coated. As described below, the flat plates 7a, 7b are movably disposed in the extending direction of the coating blade 2, so that the flow area of the protective coating agent on the coating blade 2 can be made to correspond to the center of the roll die 3 The length of the axial direction causes the flat plates 7a, 7b to be appropriately moved and adjusted. The width of the coating blade 2 is preferably a width which can maintain a protective coating agent (coating liquid) in an amount sufficient to apply to the entire circumference of the roll mold 3 as a coating object. The thickness of the coating blade 2 is preferably a thickness that can maintain the shape of the coating blade 2 and can maintain a protective coating agent (coating liquid) on the coating blade 2. If the coating blade 2 is deformed by the weight of the protective coating agent, it is difficult to uniformly coat the protective film agent (coating liquid) on the roll mold 3.

For example, in the case where the roll mold 3 having a face length of 1500 mm is a coated object, it is preferable that the length of the application direction of the application blade 2 is 1400 to 2000 mm, the width is 30 to 100 mm, and the thickness is 3 mm. the above.

Fig. 3 is a schematic view for explaining a mounting position of the coating blade 2 on the fixing member 9. In order to guide the protective coating agent well to the roll mold 3, the coating blade 2 is attached to the fixing member 9 so that the angle α with respect to the horizontal direction is preferably 30 to 60°. If it exceeds 60°, there will be a protective coating agent due to difficulty in conditioning. Since the coating blade 2 is guided to the speed of the roll die 3, it is difficult to carry out the coating efficiently. On the other hand, when it is 30 degrees or less, it is easy to fall the gap 11 between the coating blade 2 and the roll die 3, and it is difficult to modulate the film thickness by the coating blade 2.

The position of the coating blade 2 is not limited as long as it is higher than the horizontal plane including the central axis of the roll die 3 as described above, but it is preferable that the angle β with the plane including the central axis is 30°. the above. If the angle β formed by the plane containing the central axis is less than 30°, the protective coating agent (coating liquid) easily falls directly to the lower portion without flowing on the roll mold 3, thereby being inefficient.

(flat)

The flat plates 7a, 7b are used to coat one of the flow areas of the protective coating agent on the coating blade 2 against the flat plate. When the roller die 3 having the center axis is horizontally disposed at a specific position in the coating device 20, the flat plates 7a, 7b are positioned on the coating blade 2 such that one of the main faces faces each other. . Fig. 4 is a view schematically showing the positional relationship between the coating blade 2, the flat plate 7a, and the stopper 8. The pair of flat plates 7a, 7b are plate-shaped perpendicularly to the coating blade 2, as long as the leakage of the protective coating agent (coating liquid) can be prevented and the protective coating agent can be held on the coating blade 2 ( The shape and size are not particularly limited as long as the liquid reservoir can be formed. The flat plates 7a, 7b are preferably provided on the coating blade 2 so as not to be in contact with the roll die 3 as a coating object. For example, it is preferably the same size as the width direction of the coating blade 2. Further, the height of the flat plates 7a and 7b is not limited as long as it can maintain the protective film agent (the liquid reservoir can be formed) on the coating blade 2, and can be, for example, 20 to 100 mm. The flat plates 7a, 7b are preferably in a roll mold 3 which can correspond to the object to be coated. The size is configured to arbitrarily move in the extending direction of the coating blade 2 (the direction of the arrow in Fig. 4).

The flat plates 7a and 7b are preferably formed of a material which does not damage the roll mold 3 even if it is in contact with the roll mold 3 and is not eroded by the protective film agent, and is exemplified by various fluororesins (for example, polytetrafluoroethylene, tetrafluoroethylene). Ethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, etc., high density polyethylene, and the like.

(stop)

The stopper 8 is a member for maintaining a specific distance between the roller die 3 and the coating blade 2 when the protective film agent is applied to the roll die 3 in the coating device 20. As shown in FIG. 4, the stopper 8 is fixed in such a manner that the coating blade 2 is located closer to the vicinity of the roller die 3. That is, when the roller die 3 having the central axis is horizontally disposed at a specific position in the coating device 20, the stopper 8 is at a distance from the roller die 3 to the stopper 8 by the roller die 3 The distance between the coating blades 2 is short. Therefore, when the coating blade 2 is brought close to the roll die 3 as a coating object by the moving mechanism, since the stopper 8 contacts the roll die 3 before the coating blade 2, the coating blade can be prevented. 2 is in contact with the roll mold 3. In view of preventing the bending due to the length of the coating blade 2 or the contact with the effective area of the roll die 3, the stopper 8 is preferably disposed in an area other than the effective area of the roll die 3 as a coating object ( It does not correspond to the region of the productized region of the optical film), for example, disposed near the end. Moreover, it is preferable to be configured to be arbitrarily movable in the extending direction of the coating blade 2 in accordance with the size of the roll die 3.

The shape of the stopper 8 is not particularly limited as long as the above object can be attained, but it is preferably a disc (wheel that is hard to cause damage even if it is in contact with the roll mold 3). Fetal). The material of the stopper is preferably a material which is hard to cause damage even if it comes into contact with the roll die 3 and is not eroded by the protective film agent (coating liquid), and is exemplified by various fluororesins (for example, polytetrafluoroethylene, tetrafluoroethylene). - a perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, etc.), a high density polyethylene, or the like.

(coating nozzle)

The coating nozzle 1 is disposed above the coating blade 2, and supplies a protective coating agent (coating liquid) to the coating blade 2. The supply method is not particularly limited. For example, the coating liquid may be pumped upward by a pump and supplied in a fixed amount by a hose. In order to supply the coating liquid without deviation in the extending direction of the coating blade 2, it is preferable to supply the protective coating agent (coating liquid) by moving the coating nozzle 1 in the extending direction of the coating blade 2 with an actuator or the like. The composition of).

(mobile agency)

The coating device 20 includes a movement for moving the coating blade 2 in a horizontal direction in a downward direction in the vertical direction and a direction orthogonal to the central axis of the roll die 3 (in a direction toward or away from the roll die 3) mechanism. The moving mechanism is preferably configured to include, for example, a micrometer attached to the fixing member 9, whereby the distance between the coating blade 2 and the roll die 3 can be arbitrarily changed, and the film thickness of the protective film can be arbitrarily changed. Preferably, a plurality of micrometers are included in the extending direction to adjust the deformation in the extending direction of the coating blade 2.

(roller mode)

The roll mold 3 to be coated is not particularly limited, and an embossing roll having a fine uneven shape on the surface for the purpose of producing an optical film is exemplified. As such a roll mold for producing an anti-glare film, a mold for producing an anti-glare film is exemplified. Such a roll mold determines the optical characteristics by the fine unevenness of the surface, and therefore requires the roll to be free from rust or damage. Therefore, it is suitable as an object for forming a protective film by the coating apparatus of the present invention. Among them, a roll mold for producing an optical film having a metal surface such as chrome plating, copper plating, or nickel plating is particularly effective from the viewpoint of preventing rust. For example, a roll mold for producing an optical film having a fine surface uneven shape disclosed in JP2006-53371-A, JP2007-187952-A, JP2007-237541-A, or the like is suitable as a coating object. Further, the protective film formed by the coating apparatus of the present invention is also useful for surface protection when transporting a roll mold for producing such an optical film.

(rotation speed of the roll mold)

When the coating liquid is supplied to the coating blade 2, the roller die 3 is rotated at a fixed speed by a rotating mechanism. The method of rotating by the rotating mechanism is not particularly limited. In FIG. 1, a configuration in which a roller-shaped driving device 4 is rotated is exemplified, and a configuration in which a rubber belt is attached to a center shaft and rotated by a motor is exemplified. The preferred range of the rotational speed of the roll die 3 varies depending on the viscosity of the coating liquid. For example, when a protective film having a viscosity of 50 to 500 mPa ‧ at 25 ° C is used, it is preferably 5 to 150 rpm. If it is less than 5 rpm, there is a case where the gravity becomes larger with respect to the centrifugal force, and the protective coating agent falls from the roll mold 3. On the other hand, when it is more than 150 rpm, it is difficult for the protective coating agent to diffuse to the entire roll mold 3.

(protective coating agent)

The protective filming agent is not particularly limited as long as it can be applied, dried at normal temperature, and peeled off after film formation, and does not leave residue at the time of peeling, and a conventionally known one can be used. In this protective coating agent, it is coated From the viewpoints of properties, releasability, cost, and the like, it is preferred to use a solvent (toluene, ethanol, ethyl acetate, or the like) to dilute a vinyl resin (such as vinyl chloride or vinyl acetate). By using such a protective film agent, in addition to the formation of the protective film, the protective film can be completely peeled off when the protective film is peeled off. Examples of such a protective coating agent include SILITECT II (manufactured by Trylaner International) containing a vinyl chloride-vinyl acetate copolymer as a main component.

(protection film thickness)

The thickness of the protective film formed on the surface of the roll film for optical film production is not particularly limited as long as the surface of the roll film for optical film production can be protected, but it is preferably dry hardened in terms of peelability, cost, and the like. The thickness of the protective film afterwards is 5 to 50 μm. When the film thickness is less than 5 μm, the strength of the protective film becomes insufficient, and when the protective film is peeled off, the protective film is easily broken, and it is difficult to peel off. Moreover, the barrier effect of oxygen or water vapor is also insufficient. When the thickness of the protective film exceeds 50 μm, the film thickness tends to become uneven when the protective film is formed, and drying takes time, which is not preferable. The thickness of the protective film can be adjusted by applying a gap between the blade 2 and the roll die 3 as described above.

[Examples]

Hereinafter, the present invention will be described in more detail by way of examples, but the invention is not limited to the examples.

<Production of Roller for Optical Film Manufacturing>

The surface of an aluminum roller (based on JIS A5056) having a diameter of 300 mm and a face length of 1350 mm was prepared with Ballard copper plating. Ballard plating The copper system includes a copper plating layer/thin silver plating layer/surface copper plating layer, and the thickness of the entire plating layer is set to be about 200 μm. The copper plating surface is mirror-polished, and a photosensitive resin is applied onto the polished copper plating surface, and dried to form a photosensitive resin film. Then, a pattern in which a plurality of patterns having a dot diameter of 16 μm as shown in FIG. 5 are randomly arranged is repeatedly exposed and developed on the photosensitive resin film by laser light. Exposure using laser light and development were carried out using Laser Stream FX (manufactured by Think Laboratory Co., Ltd.). A positive photosensitive resin is used for the photosensitive resin film.

Thereafter, the first etching treatment is performed with a copper chloride solution. The etching amount at this time was set to 3 μm. The photosensitive resin film was removed from the roll after the first etching treatment, and the second etching treatment was performed again with the copper chloride solution. The etching amount at this time was set to 10 μm. Thereafter, chrome plating was performed to prepare a roll mold for optical film production. At this time, the chrome plating thickness was set to 4 μm.

<Example 1>

In Example 1, a protective film was formed on the surface of the roll mold for optical film production using the coating apparatus of FIG. First, the roll film for optical film production obtained by the above method was placed in the coating apparatus of Fig. 1 so that the central axis was horizontal. The gap between the coating blade and the roll die was set to 0.3 mm, and the coating nozzle was moved from one end of the roll mold to the other end at a speed of 140 mm/sec, and the protective film agent "SILITECT II (manufactured by Trylaner International) was used. ) is uniformly supplied to the coating blade along the extending direction of the coating blade. The supply of the protective coating agent was 450 ml. Thereafter, while the roll mold was rotated at 12 rpm, the protective film agent was guided to the roll mold, and the protective skin was applied. The film is uniformly diffused and ends the rotation. Then, the protective coating agent is dried under normal temperature and normal pressure to form a protective film on the surface of the roll mold.

<Comparative Examples 1, 2>

The coating apparatus used in Comparative Examples 1 and 2 differs from the coating apparatus of FIG. 1 only in that the squeegee is provided instead of the coating blade 2. Fig. 6 is a cross-sectional view showing a nip roll of the coating device used in Comparative Example 2. The nip rolls of the coating apparatus used in Comparative Example 1 were planes having no unevenness on the surface, and the nip rolls 13 of the coating apparatus used in Comparative Example 2 were formed with concave portions 12 between the ends as shown in Fig. 6 .

First, the roll film for optical film production obtained by the above method is placed in the coating apparatus so that the center axis is horizontal. Then, the nip roller for coating is disposed in contact with the roll mold. Then, while the roll mold was rotated at 12 rpm, the protective film agent "SILITECT II (manufactured by Trylaner International)" was supplied between the nip roll and the roll mold, and the protective film agent was uniformly spread on the surface of the roll mold. End the rotation. Then, the protective coating agent is dried under normal temperature and normal pressure to form a protective film on the surface of the roll mold.

<Measurement ̇ Evaluation>

The protective film formed in Example 1, Comparative Examples 1 and 2 was peeled off from the roll mold by hand, and the film thickness was measured at 6 points on the peeled protective film. The average film thickness and standard deviation at this time are shown in Table 1. Moreover, the presence or absence of the residue after peeling of a protective film was visually judged. Residue indicates that the protective film cannot be easily peeled off. Further, the amount of the protective film agent for protecting the film formation is measured, and the presence or absence of the solvent odor derived from the protective film agent in the coating step and the unevenness of the coating which is visually confirmed after the coating are determined. Conduct an evaluation. On the table The evaluation results of these are indicated in 1.

As is clear from the results shown in Table 1, in Example 1, the standard deviation of the film thickness was small, and coating unevenness was not observed by visual observation, and the film thickness was uniform. Further, in Example 1, the solvent odor in the coating step was not produced. Further, the protective film can be easily peeled off without residue. On the other hand, in Comparative Example 1, although the average film thickness was small, the standard deviation was large, and uneven coating was observed by visual observation, and it was found that there was a portion where the film thickness was uneven. In Comparative Example 2, the standard deviation of the film thickness was also large, and uneven coating was also confirmed, whereby the film thickness was uneven. Further, in Comparative Example 2, the amount of the protective coating agent used was large, and a solvent odor was also generated in the middle of coating. This is because the protective film agent is supplied to the concave portion of the nip roller, so that the amount of use is increased, and solvent odor is likely to occur.

1‧‧‧ Coating nozzle

2‧‧‧Scraper

3‧‧‧roller

3a‧‧‧ outer perimeter

4‧‧‧ drive

5‧‧‧Rotary control device

6‧‧‧Rotary auxiliary roller

7a‧‧‧ flat plate (stopper)

7b‧‧‧ flat plate (stopper)

8‧‧‧stops

9‧‧‧Fixed components

10‧‧‧Support column

11‧‧‧ gap

12‧‧‧ recess

13‧‧‧Pinch roller

20‧‧‧ Coating device

Fig. 1 is a cross-sectional view showing an example of a coating apparatus of the present invention.

Fig. 2 is a top perspective view showing in detail the constituent elements of the periphery of the coating blade of the coating device shown in Fig. 1.

Fig. 3 is a schematic view for explaining a mounting position of a coating blade on a fixing member.

Figure 4 is a schematic view showing the coating blade of the coating device shown in Figure 1, flat A diagram of the positional relationship between the plate and the stopper.

Fig. 5 is a magnified view of a pattern used for the production of a roll mold for optical film production.

Fig. 6 is a cross-sectional view showing a nip roll as a coating mechanism of the coating device used in Comparative Example 2.

1‧‧‧ Coating nozzle

2‧‧‧Scraper

3‧‧‧roller

3a‧‧‧ outer perimeter

4‧‧‧ drive

5‧‧‧Rotary control device

6‧‧‧Rotary auxiliary roller

20‧‧‧ Coating device

C1‧‧‧ water level

Claims (6)

A coating device for applying a protective film agent to a roll mold for manufacturing an optical film, the device comprising: a coating blade for applying a protective film agent to a roll mold in the device The protective film agent is flowed thereon and guided onto the roll mold; a pair of flat plates for defining a flow area of the protective film agent on the coating blade; a stopper attached thereto a member for applying a protective film agent to the roll mold to maintain a specific distance between the roll mold and the coating blade; and a rotating mechanism for coating the protective film agent in the device In the case of a roll mold, the roll mold is rotated; the coating blade, the flat plate, and the stopper are disposed such that the roll mold having the center axis is horizontally disposed on the center axis In a specific position in the device, the coating blade is located above a horizontal plane including a central axis of the roller die, and extends parallel to the central axis; the flat plate is oriented such that one of the main faces faces each other Located on the above coated squeegee And the distance the roller die and the stopper member relatively short distance above the roller coating die of the blade. The coating device of claim 1, which further comprises the step of applying the above-mentioned coating blade along lead A moving mechanism that moves in the vertical direction and in the horizontal direction orthogonal to the central axis. The coating apparatus of claim 1, wherein the coating blade comprises a fluororesin. A coating apparatus according to claim 1, wherein said flat plate is movable in a direction in which said coating blade extends. The coating device of claim 1, wherein the stopper is movable in a direction in which the coating blade extends. The coating apparatus according to any one of claims 1 to 5, wherein the roll mold is a mold for producing an anti-glare film having a concave-convex shape on its surface.