JP2012254445A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating apparatus formable of a protective film, having a uniform film thickness and easy to peel off, on a surface of a roller mold for producing an optical film without diffusing a solvent of the protective film excessively.SOLUTION: The coating apparatus for coating a protective film agent onto the roller mold for producing the optical film includes: a coating blade 2 that is disposed above a horizontal plane including the central axis of the roller mold 3 and extends in the direction of the central axis, with respect to the roller mold 3 disposed so that the central axis is horizontal; a liquid stop that consists of a pair of plates 7a and 7b provided on the coating blade and defining a flow region of a coating solution that is the protective film agent on the coating blade; a stopper 8 that is provided to keep a constant distance from the surface of the roller mold, and located closer to the roller mold than the coating blade; and a rotating means that rotates the roller mold at a given rotation speed.

Description

  The present invention relates to a coating apparatus for coating a protective film agent on a roll mold for optical film production.

  As a manufacturing method of various optical films such as a diffusion film and an antiglare film having a fine uneven shape on the surface, a mold having a reverse shape to a predetermined fine uneven shape is prepared, and using the die, a hot embossing method, It is known to use a method such as a UV embossing method (Patent Documents 1 to 3). When producing an optical film using such an embossing method, if the mold is made into a roll, the optical film can be produced in a continuous roll, which is excellent in mass productivity.

  However, such a roll mold for producing an optical film sometimes has its surface deteriorated when rust is generated during storage or dirt or foreign matter adheres thereto. Thus, when an optical film is manufactured using the metal mold | die with which the surface deteriorated, a defect will generate | occur | produce in the obtained optical film. The defect generated in the optical film has periodicity depending on the diameter of the roll mold for manufacturing the optical film, and the mass productivity is remarkably lowered.

  In order to prevent the occurrence of rust on the surface of the mold, it is known to store the mold in a state where rust preventive oil is applied. However, when rust-preventing oil is applied, it is necessary to remove the rust-preventing oil, which requires man-hours to remove the rust-preventing oil, and in addition, when the rust-preventing oil cannot be completely removed. There was also a problem that defects occurred in the obtained optical film. There was also a risk of damaging the mold when removing the rust preventive oil. Furthermore, some roll molds for producing optical films are difficult to apply rust-preventing oil due to functional limitations.

  When rust preventive oil cannot be used, a method of packaging and storing a mold with vaporizable rust preventive paper is known (Patent Document 4). Also, a method for storing a roll mold for manufacturing an optical film in a sealed container and replacing the air in the sealed container with a non-oxidizing gas such as nitrogen gas, or a roll mold for manufacturing an optical film in a sealed container. A method of storing a mold together with an oxygen scavenger is also known (Patent Document 5).

  Furthermore, it is known that a rust preventive treatment is performed by immersing and drying a substrate to be rust-prevented in a rust preventive treatment agent containing a water-soluble amino-functional silane coupling agent (Patent Document 6). As an apparatus for applying a coating liquid to a roll-shaped substrate, an application apparatus using an application roll is also known (for example, Patent Document 7).

JP 2006-53371 A JP 2007-188792 A JP 2007-237541 A JP 2001-10679 A JP-A-7-291364 JP 2006-28597 A JP 2001-170532 A

  However, when using vaporizable rust-proof paper, foreign matter enters the rust-proof paper itself or between the rust-proof paper and the mold due to friction with the rust-proof paper during packing or transportation, and the foreign matter There was a risk of damaging the surface of the roll mold for film production. Patent Document 6 describes that it is preferable to dry the rust inhibitor by heating to 100 ° C. or higher, and by this drying, the accuracy of the fine surface shape of the roll mold for optical film production is described. In addition, the removal of the rust preventive agent may cause the same problem as the above-mentioned rust preventive oil. In addition, the method described in Patent Document 7 has a problem that the solvent is diffused widely because the coating liquid is attached by rotating the coating roll, and further, there is a problem that the method cannot be applied when the size of the substrate is changed. there were.

  The present invention provides a coating apparatus capable of forming a protective film with a uniform film thickness on the surface of a roll mold for producing an optical film without excessively diffusing the solvent of the protective film agent. The purpose is to provide.

  The present invention is a coating apparatus for applying a protective film agent to a roll mold for manufacturing an optical film, the center of the roll mold with respect to the roll mold arranged so that the central axis is horizontal. A coating blade disposed above the horizontal plane including the shaft and extending in the direction of the central axis, and provided on the coating blade, defines a flow region of the coating liquid that is a protective coating agent on the coating blade. A liquid stopper made up of a pair of plates, a coating blade is provided so as to keep a certain distance from the surface of the roll mold, and a roll positioned at a predetermined rotational speed with a stopper positioned closer to the roll mold than the coating blade. There is provided a coating apparatus comprising: a rotating unit that rotates a mold.

  The coating apparatus of the present invention preferably further includes a moving means for moving the coating blade in the vertical direction and in the horizontal direction orthogonal to the central axis of the roll mold. The coating blade is preferably made of a fluororesin. The pair of plates and stoppers constituting the liquid stopper are preferably provided so as to be movable in the extending direction of the coating blade.

  The roll mold to be coated by the coating apparatus of the present invention is preferably a mold for producing an antiglare film having an uneven surface.

  According to the coating apparatus of the present invention, the protective film agent solvent is not excessively diffused on the surface of the roll mold for optical film production, and the roll mold surface is not damaged, and the film thickness is uniform. A protective film that can be easily peeled can be formed.

It is sectional drawing which shows an example of the coating apparatus of this invention. FIG. 2 is a top perspective view showing details of components around a coating blade in the coating apparatus shown in FIG. 1. It is a schematic diagram for demonstrating the attachment position to the fixing member of a coating blade. It is a figure which shows typically the positional relationship of the coating blade in the coating apparatus shown in FIG. 1, and the plate and stopper which comprise a liquid stopper. It is the pattern enlarged view used for preparation of the roll metal mold | die for optical film manufacture. It is sectional drawing of the nip roll which is a coating means of the coating apparatus used in the comparative example 2.

Hereinafter, the present invention will be described in detail with reference to the drawings.
[Configuration of coating equipment]
FIG. 1 is a cross-sectional view showing an example of a coating apparatus of the present invention. In the coating apparatus 20 shown in FIG. 1, the roll mold 3 for manufacturing an optical film, which is a coating target, is arranged so that the central axis is horizontal. The coating apparatus 20 supplies a plate-like coating blade 2 disposed so as to have a predetermined gap with the roll mold 3, and a coating liquid that is a protective coating agent on the coating blade 2. A coating nozzle 1, a roll-shaped drive device 4 for rotating the roll mold 3, a rotation control device 5, and a rotation auxiliary roll 6 are provided. The drive device 4, the rotation control device 5, and the rotation auxiliary roll 6 constitute a rotation means. The coating blade 2 is disposed above the horizontal plane C1 including the central axis of the roll mold, and is disposed so as to face the outer peripheral surface 3a of the roll mold 3 and not to contact the roll mold 3. . The coating blade 2 extends in the central axis direction of the roll mold 3, and guides a coating liquid that is a protective coating agent supplied from the coating nozzle 1 to the surface of the roll mold 3. Thereby, the surface of the roll metal mold | die 3 is coated with said coating liquid.

  FIG. 2 is a top perspective view showing in detail other components around the coating blade 2 of the coating apparatus 20 shown in FIG. 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 members 9, 9 positioned at both ends are provided with pulley-like stoppers 8, 8 which are members for keeping the coating blade 2 at a certain distance from the surface of the roll mold 3. The stopper 8 is fixed to the fixing member 9 so as to be positioned closer to the roll mold 3 than the coating blade 2. That is, the distance from the roll mold 3 side surface of the stopper 8 to the surface of the roll mold 3 is shorter than the distance from the tip of the coating blade 2 on the roll mold 3 side to the surface of the roll mold 3. The moving means (not shown) moves the support column 10 in the vertical direction along the vertical direction and in the horizontal direction perpendicular to the central axis C2 of the roll mold 3 (the direction indicated by the arrow in FIG. 2). Therefore, the coating blade 2 fixed on the support column 10 is also moved in the same direction. When the coating blade 2 is moved in the direction approaching the roll mold 3 by the moving means, the stopper 8 plays a role of preventing the coating blade 2 from contacting the roll mold 3.

  On the coating blade 2, a liquid stopper comprising a pair of plates 7a and 7b for defining a flow region of the coating liquid that is a protective film agent is provided. The coating liquid can be accumulated on the coating blade 2 by the pair of plates 7a and 7b. That is, the liquid reservoir on the coating blade 2 is between the pair of plates 7a and 7b. The liquid stopper prevents the coating liquid from leaking outside the plates 7a and 7b.

[Coating method]
In the coating apparatus 20, a coating liquid that is a protective film agent is supplied from the coating nozzle 1 onto the coating blade 2, and the supplied coating liquid is a roll that is a coating target and is rotated by a rotating means. It is guided to the surface of the mold 3 and spreads uniformly on the surface of the roll mold 3 by the rotation, and is naturally dried. When the 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 the gap between the coating blade 2 and the roll mold 3.

  The roll mold 3 is used for producing an optical film, and is used after the protective film is peeled off. Therefore, it is preferable that the protective film to be formed can be easily peeled by hand. Furthermore, the protective film is preferably one that can be completely peeled without leaving a residue or the like. By leaving no residue or the like, cleaning of the roll mold 3 after peeling off the protective film becomes unnecessary.

  By using the coating apparatus of the present invention, a protective film having a uniform film thickness can be formed, so that the surface of the roll mold is uniformly protected. In addition, by appropriately selecting the protective film agent to be used, a protective film that is easily peeled off by hand and hardly generates a residue when peeled can be formed. In addition, it can be dried naturally to form a protective film without being heated and dried, so there is no risk of affecting the surface of the roll mold to be coated, and a highly accurate roll mold can be provided. It is. Moreover, since the coating blade is used as the coating means, the diffusion of the solvent in the coating liquid can be suppressed. Hereinafter, each component of the coating apparatus will be described in more detail.

[Components of coating equipment]
(Coating blade)
The coating blade 2 flows over the protective coating agent supplied from the coating nozzle 1 while temporarily applying the protective coating agent to the roll mold 3 in the coating apparatus 20. This is a member for guiding to the surface of the roll mold 3. The coating blade 2 is located above a horizontal plane including the central axis of the roll mold 3 when the roll mold 3 having the central axis is placed horizontally at a predetermined position in the coating apparatus 20. It is located and is arranged to extend in parallel with its central axis. The coating blade 2 is a material that is not eroded by the protective coating agent, and may be a material that is unlikely to damage the roll mold 3 even if it is in contact with the roll mold 3 to be coated. Preferable examples include various fluororesins (for example, polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer), high-density polyethylene, and the like.

  The length in the extending direction of the coating blade 2 is preferably about the same as or longer than the length in the central axis direction of the roll mold 3 to be coated. As will be described later, the plates 7a and 7b are provided so as to be movable in the extending direction of the coating blade 2. Therefore, the flow region of the coating liquid on the coating blade 2, that is, the range of the liquid reservoir, It can be adjusted by appropriately moving the liquid stopper plates 7a and 7b according to the length of the mold 3 in the central axis direction. The width of the coating blade 2 is preferably such that it can hold an amount of coating liquid that is sufficiently applied to the entire circumference of the roll mold 3 that is the coating target. It is preferable that the thickness of the coating blade 2 is such that the coating blade 2 itself can hold the coating liquid while maintaining its shape without being applied. When the coating blade 2 is deformed by the weight of the coating liquid, it becomes difficult to uniformly apply the coating liquid to the roll mold 3.

  For example, when a roll mold 3 having a surface length of 1500 mm is a coating target, the length of the coating blade 2 in the extending direction is 1400 to 2000 mm, the width is 30 to 100 mm, and the thickness is 3 mm or more. Preferably there is.

  FIG. 3 is a schematic diagram for explaining the attachment position of the coating blade 2 to the fixing member 9. 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 ° in order to smoothly guide the coating liquid to the surface of the roll mold 3. If the angle α exceeds 60 °, the coating liquid that is a protective film agent flows rapidly into the surface of the roll mold 3, so that efficient coating may be difficult. On the other hand, when the angle α is less than 30 °, the protective film agent tends to fall from the gap 11 between the coating blade 2 and the roll mold 3, and the film thickness adjustment by the coating blade 2 may be difficult. is there.

  The position of the coating blade 2 may be an area above the horizontal plane C1 including the central axis of the roll mold 3 as described above, but the central axis from the position closest to the coating blade 2 on the surface of the roll mold 3 It is preferable that the angle β formed by the plane toward the center and the horizontal plane C1 including the central axis is 30 ° or more. If the angle β is less than 30 °, the coating liquid is likely to fall to the lower part without being transmitted through the roll mold 3 and is not efficient.

(Liquid stopper)
The pair of plates 7 a and 7 b constituting the liquid stopper are members for defining the flow region of the coating liquid that is a protective film agent on the coating blade 2. When the roll mold 3 having the central axis is disposed at a predetermined position in the coating apparatus 20 with the central axis being horizontal, the plates 7a and 7b are arranged on the coating blade 2 so that the principal surfaces of each other (that is, The surfaces that come into contact with the supplied coating solution are positioned so as to face each other. FIG. 4 is a diagram schematically showing the positional relationship between the coating blade 2 and one plate 7a and stopper 8 constituting the liquid stopper. The pair of plates 7a and 7b (see FIG. 2) constituting the liquid stopper are plate-like plates installed perpendicular to the coating blade 2, and prevent the coating liquid from leaking, and the coating blade The shape and size are not particularly limited as long as the liquid reservoir can be formed by holding the coating liquid on 2. The pair of plates 7a and 7b are preferably provided so as not to come into contact with the roll mold 3 to be coated. For that purpose, it suffices to install on the coating blade 2 so as not to be closer to the roll mold 3 than this. For example, the size (length) is preferably about the same as the width direction of the coating blade 2. Further, the height of the plates 7a and 7b is not limited as long as the coating liquid can be held on the coating blade 2 to form a liquid reservoir, and can be set to 20 to 100 mm, for example. The plates 7a and 7b are configured such that they can be arbitrarily moved in the extending direction of the coating blade 2 (in the direction of the arrow in FIG. 4) according to the size of the roll mold 3 to be coated. It is preferable.

  The plates 7a and 7b are preferably formed of a material that does not damage the roll mold 3 even if it contacts the roll mold 3 and does not erode by the protective film agent. Examples thereof include polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer), and high-density polyethylene.

(stopper)
The stopper 8 is a member for maintaining a predetermined distance between the roll mold 3 and the coating blade 2 when the protective film agent is applied to the roll mold 3 in the coating apparatus 20. As shown in FIGS. 2 and 4, the stopper 8 is fixed to the fixing member 9 so as to be positioned closer to the roll mold 3 than the coating blade 2. That is, the distance from the roll mold 3 side surface of the stopper 8 to the surface of the roll mold 3 is the distance from the tip of the coating blade 2 to the roll mold 3 (ie, the figure). Shorter than the gap 11) shown in FIG. Therefore, when the coating blade 2 is brought close to the roll mold 3 to be coated by the moving means, the stopper 8 comes into contact with the roll mold 3 before the coating blade 2, so that the coating blade 2 and the roll mold 3 can be prevented from contacting. The stopper 8 takes into account the bending due to the length of the coating blade 2 and the prevention of contact with the effective area of the roll mold 3. It is preferable to be arranged in an area not corresponding to the productized area), for example, in the vicinity of the end. Moreover, it is preferable to be comprised so that it can be arbitrarily moved to the extension direction of the coating blade 2 according to the magnitude | size of the roll metal mold | die 3. FIG.

  The shape of the stopper 8 is not particularly limited as long as the above object can be achieved, but it is preferable that the stopper 8 has a disk (tire) shape that is not easily damaged even when it comes into contact with the roll mold 3. The stopper 8 is preferably made of a material that is not easily damaged even when it comes into contact with the roll mold 3 and that is not affected by the coating liquid that is a protective film agent, such as various fluororesins (for example, polytetrafluoroethylene, tetra And fluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, etc.), high-density polyethylene and the like.

(Coating nozzle)
The coating nozzle 1 is disposed above the coating blade 2 and supplies a coating liquid that is a protective coating agent onto the coating blade 2. The supply method is not particularly limited. For example, the supply liquid may be pumped up 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, a configuration in which the coating liquid can be supplied by moving the coating nozzle 1 in the extending direction of the coating blade 2 with an actuator or the like is preferable.

(transportation)
The coating apparatus 20 moves to move the coating blade 2 in the vertical direction along the vertical direction and in the horizontal direction perpendicular to the central axis of the roll mold 3 (direction approaching or moving away from the roll mold 3). Means. The moving means includes, for example, a micrometer attached on the fixed member 9, whereby the distance between the coating blade 2 and the roll mold 3 can be arbitrarily changed, and the film thickness of the protective film can be arbitrarily changed. A configuration is preferred. In order to adjust the strain in the extending direction of the coating blade 2, a plurality of micrometers are preferably provided in the extending direction.

[Other description]
(Roll mold)
The roll mold 3 that is the object of coating is intended for the production of an optical film. Among optical film manufacturing molds, roll molds that are preferably stored or transported with the surface covered with a protective film, and to which the coating apparatus of the present invention is suitably applied to form the protective film As an example, a mold for producing an antiglare film is exemplified. In general, a roll mold for producing an antiglare film is an embossing roll having a fine concavo-convex shape on its surface. Such a roll mold is required to be free from scratches due to rust and damage of the roll because the optical characteristics are determined by fine irregularities on the surface. Therefore, it is suitable as an object for forming a protective film by the coating apparatus of the present invention. Among them, it is particularly effective from the viewpoint of preventing the occurrence of rust on a roll mold for producing an optical film having a metal surface such as chromium plating, copper plating, or nickel plating. For example, a roll mold for producing an optical film having a fine surface irregularity shape as disclosed in JP-A-2006-53371, JP-A-2007-187852, JP-A-2007-237541, etc. is applied. Suitable as a work object. Moreover, the protective film formed by the coating apparatus of this invention becomes useful also for the protection of the surface at the time of transporting such a roll die for optical film manufacture.

(Roll mold rotation speed)
When the coating liquid is supplied to the coating blade 2, the roll mold 3 is rotated at a constant speed by the rotating means. The rotation method by the rotation means is not particularly limited. In FIG. 1, the configuration rotated by the roll-shaped drive device 4 is illustrated, but other configurations such as a configuration in which a rubber band is attached to the central axis and the motor is rotated by a motor can be cited. The preferred range of the rotational speed of the roll mold 3 varies depending on the viscosity of the coating liquid. For example, when a protective coating agent having a viscosity of 50 to 500 mPa · s at 25 ° C. is used, 5 to 150 rpm is preferable. If it is less than 5 rpm, gravity increases with respect to centrifugal force, and the protective film agent may sag from the roll mold 3. On the other hand, when it is larger than 150 rpm, the protective film agent is difficult to spread over the entire roll mold 3.

(Protective film agent)
The protective film agent is not particularly limited as long as it can be applied, dried at room temperature, and peeled off after the film is formed, and does not leave any residue when peeled off. be able to. Among such protective coating agents, from the viewpoint of applicability, releasability, cost, etc., it is necessary to use a resin in which a vinyl resin (vinyl chloride, vinyl acetate, etc.) is diluted with a solvent (toluene, ethanol, ethyl acetate, etc.) preferable. By using such a protective film agent, the protective film can be easily formed, and the protective film can be integrally peeled off when the protective film is peeled off. As such a protective film agent, for example, Silicate II (manufactured by Trylaner International) having a vinyl chloride-vinyl acetate copolymer as a main component can be used.

(Protective film thickness)
The thickness of the protective film formed on the surface of the roll mold for optical film production is not particularly limited as long as the surface of the roll mold for optical film production can be protected. The film thickness is preferably 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 the peeling becomes difficult. Moreover, there is a possibility that the blocking effect of oxygen and water vapor is insufficient. When the film thickness exceeds 50 μm, the film thickness tends to be nonuniform when forming the protective film, and it takes time to dry, which is not preferable. As described above, the thickness of the protective film can be adjusted by the gap between the coating blade 2 and the roll mold 3.

  EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[Production of roll mold for optical film production]
A surface of an aluminum roll (A5056 by JIS) having a diameter of 300 mm and a surface length of 1350 mm was prepared by applying copper ballad plating. Copper ballad plating consists of a copper plating layer / thin silver plating layer / surface copper plating layer, and the thickness of the entire plating layer was set to be about 200 μm. The copper plating surface was mirror-polished, and a photosensitive resin was applied to the polished copper plating surface and dried to form a photosensitive resin film. Next, a pattern obtained by repeatedly arranging a pattern formed by randomly arranging a large number of dots having a dot diameter of 16 μm shown in FIG. 5 was exposed on a photosensitive resin film with a laser beam and developed. Laser light exposure and development were performed using Laser Stream FX (manufactured by Sink Laboratory Co., Ltd.). A positive photosensitive resin was used for the photosensitive resin film.

  Then, the 1st etching process was performed with the cupric chloride liquid. The etching amount at that 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 cupric chloride solution. The etching amount at that time was set to 10 μm. Then, chromium plating processing was performed and the roll metal mold | die for optical film manufacture was produced. At this time, the chromium plating thickness was set to 4 μm.

<Example 1>
In Example 1, a protective film was formed on the surface of a roll mold for manufacturing an optical film using the coating apparatus of FIG. First, the roll mold for producing an optical film produced by the method shown above was installed in the coating apparatus of FIG. 1 so that the central axis was horizontal. The gap between the coating blade and the roll mold was set to 0.3 mm, the protective coating agent “Silect II (manufactured by Trylaner International)” was applied on the coating blade, and the coating nozzle was 140 mm / sec. The roll mold was moved from one end of the roll mold to the other end at a speed and supplied uniformly in the extending direction of the coating blade. The supply amount of the protective film agent was 450 ml. Thereafter, the protective film agent was guided to the roll mold while rotating the roll mold at 12 rpm, and the rotation was completed by spreading it uniformly on the surface. And the protective film agent was dried at normal temperature and normal pressure, and the protective film was formed in the roll metal mold | die surface.

<Comparative Examples 1 and 2>
The coating apparatus used in Comparative Examples 1 and 2 differs from the coating apparatus of FIG. 1 only in that a nip roll is provided instead of the coating blade 2. FIG. 6 shows a cross-sectional view of the nip roll of the coating apparatus used in Comparative Example 2. The nip roll of the coating apparatus used in Comparative Example 1 is a flat surface with no irregularities on the surface, and the nip roll 13 of the coating apparatus used in Comparative Example 2 has a recess 12 formed between the end portions as shown in FIG. It is what has been.

  First, the roll mold for producing an optical film produced by the method described above was installed in a coating apparatus so that the central axis was horizontal. And the nip roll for coating was arrange | positioned so that a roll metal mold | die might be contacted. Thereafter, the roll mold is rotated at 12 rpm, and the protective coating agent “Silect II (manufactured by Trylaner International)” is supplied between the nip roll and the roll mold, and the protective coating agent is uniformly spread on the roll mold surface. To finish the rotation. And the protective film agent was dried at normal temperature and normal pressure, and the protective film was formed in the roll metal mold | die surface.

<Measurement / Evaluation>
The protective film formed in Example 1 and Comparative Examples 1 and 2 was peeled off from the roll mold by hand, and the film thickness was measured at 6 points for the peeled protective film. Table 1 shows the average film thickness and standard deviation at this time. Moreover, the presence or absence of the residue after protective film peeling was determined visually. The presence of a residue indicates that the protective film could not be easily peeled off. In addition, the amount of the protective film used for forming the protective film is measured, and the presence or absence of solvent odor derived from the protective film in the coating process and the presence or absence of coating unevenness visually confirmed after coating are evaluated. did. Table 1 shows the evaluation results.

  From the results shown in Table 1, it can be seen that in Example 1, the standard deviation of the film thickness was small, coating unevenness was not visually confirmed, and the film thickness was uniform. Moreover, in Example 1, the solvent odor in the coating process was not generated. Furthermore, the protective film could be easily peeled off and there was no residue. On the other hand, in Comparative Example 1, although the average film thickness was small, the standard deviation was large and the coating unevenness was confirmed by visual observation, so that it was found that there was a portion where the film thickness was not uniform. Also in Comparative Example 2, since the standard deviation of the film thickness was large and the coating unevenness was confirmed, it can be seen that the film thickness was non-uniform. In Comparative Example 2, the amount of the protective film agent used was large, and solvent odor was also generated during coating. It is understood that this is because the protective film agent is supplied to the recesses in the nip roll, so that the amount used is increased and the solvent odor is easily generated.

  DESCRIPTION OF SYMBOLS 1 Coating nozzle, 2 coating blade, 3 roll metal mold, 3a outer peripheral surface, 4 drive device, 5 rotation control device, 6 rotation auxiliary roll, 7a, 7b plate (liquid stop), 8 stopper, 9 fixing member, 10 Support pillar, 11 gap, 12 recess, 13 nip roll, 20 coating device.

Claims (6)

A coating apparatus for applying a protective film agent to a roll mold for optical film production,
A coating blade that is disposed above a horizontal plane including the central axis of the roll mold and extends in the direction of the central axis with respect to the roll mold that is disposed so that the central axis is horizontal.
A liquid stopper comprising a pair of plates provided on the coating blade and defining a flow region of the protective coating agent on the coating blade;
The coating blade is provided so as to maintain a certain distance from the surface of the roll mold, and a stopper positioned closer to the roll mold than the coating blade;
And a rotating means for rotating the roll mold at a predetermined rotation speed.   The coating apparatus according to claim 1, further comprising moving means for moving the coating blade in a vertical direction and a horizontal direction orthogonal to the central axis.   The coating apparatus according to claim 1, wherein the coating blade is made of a fluororesin.   The said pair of plate is a coating apparatus in any one of Claims 1-3 provided so that the movement to the extension direction of the said coating blade was possible.   The coating device according to claim 1, wherein the stopper is provided so as to be movable in an extending direction of the coating blade.   The said roll metal mold | die is a coating apparatus in any one of Claims 1-5 which is a metal mold | die for glare-proof film manufacture which has uneven | corrugated shape on the surface.