JP2009069261A - Manufacturing device, method and dryer for coating film, and optical film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide manufacturing device and method, a dryer, and an optical film for maintaining higher drying speed than at least natural drying while preventing the occurrence of even slight unevenness in drying and improving its productivity. <P>SOLUTION: In this manufacturing device, the distance for conveying the coating film from an application part of an applying device to a carrying-in port of a drying furnace is in a range of 0.2 m or more and 0.8 m or less, the inside of the drying furnace is divided into a plurality of drying passages, which are provided with an air intake and exhausting means each, and an air straightening member is provided in a space between the air intake means and a coating film conveying part. Furthermore, the distance between a top plate and a bottom plate is in a range of 10 mm or more and 100 mm or less, and the relationship between the height L1 of the top plate and the coating film and the height L2 of a bottom plate side clearance between the bottom plate and a basic member is L1≤L2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating film manufacturing apparatus and manufacturing method. In particular, a coating film manufacturing apparatus, a manufacturing method, and a drying apparatus used in manufacturing an optical film or the like in which an organic solvent is included in the coating liquid and a film thickness unevenness with an error of 1% or less as a film thickness accuracy is recognized as a product defect. The present invention relates to an optical film.

  In recent years, optical film products manufactured using wet coating technology are increasingly required to have an error of 1% or less in terms of film thickness accuracy. In the production of such an optical film, an organic solvent is generally used as a solvent for a coating solution. However, an organic solvent has a higher evaporation rate than water and must be accurately dried in the drying process after coating. It is known to cause wind-like unevenness.

  Conventionally, there are many techniques aimed at increasing the drying efficiency of a coating film. For example, Patent Document 1 proposes a method in which hot air is applied to both surfaces of a traveling substrate. In this method, hot air is applied to the surface of the coating film. As a result, the film is uneven and cannot be used in products that require high film thickness accuracy.

On the other hand, a technique that emphasizes drying more precisely than drying efficiency for the formation of a precise coating film has also been proposed. For example, Patent Document 2 proposes that the speed of the drying air on the film surface be lowered in the initial stage of drying.
Patent Document 3 also proposes that precise drying is performed as a result of suppressing the drying speed as much as possible by saturating the atmosphere solvent concentration during drying.
However, these methods are intended to achieve a uniform surface shape by slowing the drying speed, and have a drawback that productivity is lowered.

Therefore, as a method of drying while efficiently removing the evaporated solvent in order to increase the drying speed as much as possible, Patent Document 4 discloses a solvent that is evaporated by dividing a traveling base material into a base material transport section and a solvent removal section. There has been proposed a method of drying while always removing with a cross wind of the solvent removal section. This method is characterized in that the substrate transport section is narrowly divided in the vicinity of the substrate.
Further, Patent Document 5 proposes a method in which the solvent evaporated on the condensing plate is condensed and removed instead of being removed by cross wind.
In order to increase the drying speed, there has also been proposed a method in which a cross wind is directly applied to a base material while straightening the dry air. However, for example, the method described in Patent Document 6 is based on the premise that no wind is applied until the coating liquid viscosity in the initial stage of drying rises to 1.5 times, and the drying speed cannot be dramatically improved. .
These methods have a problem that the drying rate cannot be increased more than the drying rate of so-called natural drying in which the drying rate is left in the atmosphere, and the productivity cannot be dramatically improved.
JP 2002-59074 A JP 2003-126768 A JP 2002-320898 A JP 2003-93954 A JP 2002-515585 A JP 2005-81256 A

  An object of the present invention is to provide a coating film manufacturing apparatus, a manufacturing method, and a drying apparatus capable of maintaining a drying speed faster than at least natural drying while suppressing generation of slight drying unevenness, and improving surface properties and productivity. It is to provide a drying device as well as an optical film.

  The invention according to claim 1 is a coating apparatus that forms a coating film by applying a coating solution containing a solvent to a belt-shaped substrate being transported, and a drying apparatus that dries while transporting the coating film formed on the substrate. The drying apparatus includes at least a drying path, an air supply port, an air supply unit, an exhaust port, an exhaust unit, and an air conditioning member, and the drying path includes: A top plate and a bottom plate facing each other with the coating film sandwiched in its thickness direction; and a right side plate and a left side plate facing each other with the coating film sandwiched in the width direction and connecting both sides of the top plate and the bottom plate. A carry-in port is provided at the upstream end of the drying path in the conveyance direction of the coating film, a carry-out port is provided at the downstream end of the drying path in the conveyance direction of the coating film, Arranged on one of the right side plate or left side plate of the drying path, the air supply means, Air is supplied into the drying path through the air supply port, the exhaust port is disposed on the other of the left side plate or the right side plate, and the exhaust means is provided in the dry path through the exhaust port. The air conditioning member is disposed at the air supply port, and the air conditioning member extends along the right side plate or the left side plate and faces the first porous member and the second porous member. The first porous member is disposed so as to face the air supply port, the second porous member is disposed so as to face the coating film, and the first porous member is disposed. The member includes one or more planar members having a hole diameter of 2 mm to 10 mm and an opening ratio of 10% to 30%. The second porous member has a hole diameter of 0.1 mm to less than 2 mm, an opening It is characterized by comprising one or more planar members having a rate of 40% or more and 99% or less. An apparatus for producing a coating film.

  According to a second aspect of the present invention, the coating apparatus includes a coating unit that applies the coating solution to the base material to form the coating film, and coating from the coating unit to the carry-in port facing the coating unit. 2. The coating film manufacturing apparatus according to claim 1, wherein the film transport distance is in a range of 0.2 m to 0.8 m.

  According to a third aspect of the present invention, the top plate is located on the side of the base material on which the coating film is formed, and the bottom plate is located on the opposite side of the base material on which the coating film is formed. When the distance between the top plate side gap is the height L1 of the top plate side gap and the distance between the bottom plate and the base material is the height L2 of the bottom plate side gap, the height L1 and the height L2 are: 3. The coating film manufacturing apparatus according to claim 1, wherein a relationship of L1 ≦ L2 is satisfied.

  The invention according to claim 4 is the coating film manufacturing apparatus according to any one of claims 1 to 3, wherein a distance between the top plate and the bottom plate is in a range of 10 mm to 100 mm.

  According to a fifth aspect of the present invention, the air supply port has an air supply port opening opened in one of the right side plate and the left side plate, and the exhaust port opens in the other side of the right side plate or the left side plate. The height of the opening for the air supply port and the opening for the exhaust port along the direction in which the top plate and the bottom plate face each other is the height of the top plate and the bottom plate. 5. The coating film manufacturing apparatus according to claim 1, wherein the coating film manufacturing apparatus is substantially equal to a distance between

  The invention according to claim 6 is an optical film formed using the manufacturing apparatus according to any one of claims 1 to 5.

The invention according to claim 7 is a coating step in which a coating liquid containing a solvent is applied to a belt-shaped substrate being conveyed to form a coating film, and then the coating film formed on the substrate is dried in a drying path. In a manufacturing method of a coating film including a drying step of drying while transporting, an air supply port and a wind regulating member are disposed in the drying path,
The air conditioning member includes a planar first porous member and a second porous member that extend on a surface intersecting with an extended surface of the coating film of the substrate to be conveyed and face each other. And the first porous member is disposed facing the air supply port, the second porous member is disposed facing the coating film, and the first porous member has a pore diameter of 2 mm or more. The second porous member has a pore diameter of 0.1 mm to less than 2 mm and an opening ratio of 40% to 99. % Or less of a planar member, and air is allowed to flow over the coating film from the air supply port through the air conditioning member.

The invention according to claim 8 is an apparatus for drying a coated product that is dried while transporting a coating film formed on a substrate, and includes at least a drying path, an air supply port, an air supply means, an exhaust port, and an exhaust gas. Means and an air conditioning member, the drying path is opposed to the top and bottom plates sandwiching the coating film in its thickness direction, and opposed to the top plate and the top plate sandwiching the coating film in its width direction. A right side plate and a left side plate that connect both sides of the bottom plate, a transport port is provided at an upstream end in the transport direction of the coating film of the drying path, and a downstream side of the drying path in the transport direction of the coating film A carry-out port is provided at the end, the air supply port is disposed on one of the right side plate and the left side plate of the drying path, and the air supply means supplies air into the drying path through the air supply port. The exhaust port is disposed on the other of the left side plate or the right side plate, and the exhaust hand Exhausts air from the drying passage through the exhaust port,
The air conditioning member is disposed at the air supply port, and the air conditioning member includes a planar first porous member and a second porous member that extend along the right side plate or the left side plate and face each other. Consists of
The first porous member is arranged to face the air supply port, the second porous member is arranged to face the coating film, and the first porous member has a pore diameter of 2 mm or more and 10 mm or less, One or more planar members having an opening ratio of 10% or more and 30% or less are provided, and the second porous member has a hole diameter of 0.1 mm or more and less than 2 mm and an opening ratio of 40% or more and 99% or less. A coating film drying apparatus comprising at least one sheet-shaped member.

  By using the coating film manufacturing apparatus, manufacturing method and drying apparatus of the present invention, it is possible to maintain at least a drying speed faster than natural drying while suppressing the occurrence of slight drying unevenness. Can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view of a coated product manufacturing apparatus according to the present invention as viewed from the side.
A coating film is applied on the base material 4 in the coating unit 1b of the coating apparatus 1a.
The substrate 4 on which the coating film is formed is conveyed to the drying device 2.
The drying apparatus 2 includes four zones, ie, drying paths (drying zones) 3a to 3d, and each of the drying paths 3a to 3d is applied to a carry-in port provided at the upstream end in the transport direction of the coating film 5 on the drying path and the drying path. A transport outlet provided at the downstream end in the transport direction of the film 5, transports the coating film, and forcibly supplies air to the coating film transport unit 6 through the air conditioning port 9 through the air supply port 9. An air supply means for carrying out the process, an exhaust means for forcibly exhausting air from the coating film transport section 6 through the exhaust port 10 (not shown), and an inlet 13 of the drying path 3a through which the coating film is transported first. It is composed of

FIG. 2 is a schematic cross-sectional view taken along line AA ′ of the drying apparatus shown in FIG.
Air is supplied into the coating film transport section 6 using the air supply means, and air is exhausted from the coating film transport section 6 using the exhaust means, whereby an air flow 18 is generated in the coating film transport section 6. Is generated.
In the coating film transport unit 6, an air flow 15 is generated from the air supply port 9 toward the exhaust port 10, and the organic solvent evaporated from the coating film 5 transported in the coating film transport unit 6 The air is exhausted from the coating film transport unit 6 through the exhaust port 10 together with the flow 15.

At this time, the height L1 of the coating film 5 and the top plate 11 formed on the substrate 4 and the height L2 of the bottom plate side gap between the substrate 4 and the bottom plate 12 are in a relationship of L1 ≦ L2. preferable.
More specifically, as shown in FIG. 2, each of the drying paths 3a to 3d sandwiches the coating film 5 in the thickness direction and the top plate 11 and the bottom plate 12 that face each other and the coating film 5 in the width direction. And the right side plate and the left side plate that connect both sides of the top plate 11 and the bottom plate 12, the top plate 11 is located on the side of the base material 4 on which the coating film 5 is formed, and the bottom plate 12 is the base material. 4, the distance between the top plate 11 and the coating film 5 is the height L1 of the gap on the top plate 11 side, and the distance between the bottom plate 12 and the substrate 4 is the bottom plate 12. When the side gap height L2 is set, it is preferable that the height L1 and the height L2 satisfy the relationship of L1 ≦ L2.
When the relationship of L1 ≦ L2 is satisfied, wind that becomes a disturbance mainly flows between the base material 4 and the bottom plate 12, so that the wind that becomes a disturbance hardly hits the coating film surface, and the surface property and productivity are reduced. Can be improved.

  Further, if the distance between the top plate 11 and the bottom plate 12 is less than 10 mm, there is a disadvantage that causes a trouble such as contact with the top plate 11 or the bottom plate 12 when the base material 4 is conveyed. If the distance between the bottom plate 12 and the bottom plate 12 is larger than 100 mm, it is necessary to increase the air supply amount and the exhaust amount in order to maintain the drying speed. In terms of stable production and cost, it is preferable that the distance between the top plate 11 and the bottom plate 12 is in the range of 10 mm or more and 100 mm or less.

In addition, the air supply port 9 has an air supply port opening which is opened in one of the right side plate and the left side plate, and the exhaust port 10 has an air outlet opening which is opened in the other side of the right side plate or the left side plate. is doing.
When the heights of the opening for the air supply port and the opening for the exhaust port along the direction in which the top plate 11 and the bottom plate 12 face each other substantially coincide with the distance between the top plate 11 and the bottom plate 12, The air flow generated between the opening for the exhaust and the opening for the exhaust port is uniformly generated between the top plate 11 and the bottom plate 12, and the height at which the substrate 4 is conveyed is less likely to be blurred. Since stability at the time of conveyance of the material 4 is ensured, it is preferable.

In this configuration, it is desirable to connect the coating device 1a and the drying device 2 within a range of 0.2 m to 0.8 m. In other words, it is desirable that the coating film transport distance 8 from the coating unit 1b to the carry-in port 13 facing the coating unit 1b is in the range of 0.2 m to 0.8 m.
If the coating film conveyance distance 8 is longer than 0.8 m, the naturally drying region cannot be ignored, and unevenness due to natural drying occurs, which is not preferable. Moreover, since outside air will be interrupted | blocked in the entrance 13 which carries in the base material 4 as it is less than 0.2 m, it is unpreferable.

FIG. 3 is a schematic side view of the air conditioning member 22 as viewed from the side.
The air conditioning member 22 is a plate-like member having a small opening ratio on the side of the air inlet and canceling the velocity distribution by intentionally disturbing the airflow that is sucked by inserting a plate-like member having a large hole diameter and then having a large opening ratio and a small hole diameter. This is a mechanism having a configuration that rectifies the airflow.
Here, the aperture ratio of the hole is a value represented by (area of the opening of the hole / area of the air conditioning member) × 100 (%).
More specifically, the air supply port 9 is disposed on one of the right side plate and the left side plate of the drying path, and the exhaust port 10 is disposed on the other side of the right side plate or the left side plate of the drying path.
The air conditioning member 22 is disposed in the air supply port 9.
The air conditioning member 22 includes a planar first porous member 24 and a second porous member 23 that extend along the right side plate or the left side plate and face each other.
The first porous member 24 is disposed so as to face the air supply port 9, and the second porous member 23 is disposed so as to face the coating film 5.
In other words, the air conditioning member 22 is a planar first porous member that extends on a surface that intersects (or is perpendicular to) the extended surface of the coating film 5 of the substrate 4 to be conveyed and faces each other. 24 and the 2nd porous member 23 are comprised.

The first porous member 24 is a member that cancels the velocity distribution. As the first porous member 24, a plate-like member in which a plurality of holes are formed, such as a wire mesh or a punching metal, can be used.
A preferable configuration is such that the hole diameter is 2 to 10 mm and the aperture ratio is about 10 to 30%. However, as long as the number is increased, the shape of the hole, the hole opening ratio, etc. are particularly limited as long as it has a function of controlling the flow of air in the coating film transport unit and the flow of the evaporated organic solvent. It is not a thing. The material of the member is not particularly limited as long as it has solvent resistance.
In other words, the first porous member 24 includes one or more planar members having a hole diameter of 2 mm to 10 mm and an aperture ratio of 10% to 30%.

The second porous member 23 is a member to be rectified. As the second porous member 23, a plate-like member having a plurality of holes, such as a wire net, a mesh, and a honeycomb, can be used. A preferable configuration is that the hole diameter is 0.1 to 2 mm and the aperture ratio is about 40 to 99%. The effect of suppressing unevenness increases as the number of members having this condition is increased. The material of the member is not particularly limited as long as it has solvent resistance.
In other words, the second porous member 23 includes one or more planar members having a hole diameter of 0.1 mm to less than 2 mm and an opening ratio of 40% to 99%.

  In FIG. 1, the coating film 5 formed on the substrate 4 is carried into the first drying path 3a from the carry-in port 13 of the drying path 3a that is first carried in, and from the carry-out port 14 of the drying path 3d that is finally carried out. It is carried out of the drying path 3d. In FIG. 1, the four zones of the drying paths 3 a to 3 d are linearly arranged. However, this represents one embodiment of the present invention, and the present invention is not limited to this. Moreover, each adjacent drying path may be arrange | positioned linearly, or may be arrange | positioned refractingly.

  Further, in FIG. 1, one air supply port 9 and one exhaust port 10 are arranged in each drying path (3 a to 3 d), but this represents one embodiment of the present invention. There is no limitation, and the number of air supply ports 9 and exhaust ports 10 arranged for each drying path is not limited.

  The coating apparatus 1a in the present invention can use a gravure, a wire bar, a die or the like, but is not limited to these.

  The drying path in the present invention has a box shape that is sealed to some extent in order to prevent disturbances such as wind and dust blown from outside the drying path. A carry-in port for carrying in the coating film 5, a carry-out port installed opposite to the carry-in port, the top plate 11 installed on the side of the substrate 4 on which the coating film 5 is formed, A bottom plate 12 placed opposite to the top plate 11 across the material 4, a right side facing the conveying direction of the coating film 5, and a right side plate placed in the width direction of the coating film 5, and facing the right side plate And the left side plate installed. Here, it does not matter whether the coating film 5 is formed on the upper surface side in the gravity direction or the coating film 5 is formed on the lower surface side of the substrate 4 to be conveyed.

  As the air flow generation means selected from either the air supply means and / or the exhaust means in the present invention, depending on the outputs (supply air output D1 and exhaust output D2) of the air supply means and the exhaust means. A blower capable of adjusting the flow of air in the coating film transport unit can be used, but is not limited thereto.

The length of the drying device 2 in the present invention (base material transport direction) is not particularly limited. The length of the drying device 2 is determined by whether or not the coating film is dried, and varies depending on the product. However, in the present invention, the drying apparatus 2 having a general length of about 50 cm to 100 m is used.
In addition, the length of the drying path (the conveyance direction of the substrate) in the present invention is about 30 cm to 30 m.

  Although the conveyance speed of the base material 4 in this invention is not a matter which should be restrict | limited, the general speed of about 10 m / min or more and 100 m / min or less is preferable.

  Since the drying apparatus 2 in the present invention can stabilize the evaporation rate of the organic solvent in the coating film and suppress the occurrence of slight drying unevenness, the effect is most apparent in the initial stage of drying. The entire length of the drying apparatus is not based on the drying apparatus 2 of the present invention, and the drying apparatus 2 of the present invention is introduced only in the initial stage of drying including the inlet of the drying path for first carrying the coating film formed on the substrate. It is also possible to do. In that case, as shown in FIG. 1, the drying apparatus 2 of the present invention may be introduced as the first drying apparatus in the first half, and a known drying apparatus may be introduced as the second drying apparatus 21 in the second half.

  As the second drying device 21, a method of applying a jet flow with increased temperature to a coating film formed on a base material from a slit nozzle or punching metal may be introduced, or a quick return type nozzle or base material A system in which hot air is ejected from a nozzle of a system in which a parallel flow is made in the transport direction may be used. Moreover, you may provide a heating means not only from one side but from both sides. The use of any commercially available drying apparatus does not interfere with the effects of the present invention.

  Further, FIG. 1 shows a case where the drying device 2 of the present invention and the known second drying device 21 are independent from each other, but the first half of one drying device is the drying device of the present invention. The effect of the present invention remains the same even when the latter part is based on a known drying apparatus.

  The coating film drying apparatus and drying method of the present invention, and the coated product manufacturing apparatus and manufacturing method using these can be used for various products. It is effective for products with less tolerance for unevenness.

  Here, the optical film is a film that controls the direction, phase, polarization plane, and the like of transmitted light and reflected light, and is, for example, a film used on the outermost surface of a display device such as a liquid crystal or a plasma display or on the inside thereof. Yes, examples thereof include an antireflection film, an antiglare film, an optical compensation film, and a light diffusion film.

  Examples of the organic solvent used in the present invention include alcohols such as methanol, ethanol, isopropanol, butanol and 2-methoxyethanol, ketones such as acetone, methyl ethyl ketone and methyl isobutyl, methyl acetate, ethyl acetate and butyl acetate. Esters, ethers such as diisopropyl ether, glycols such as ethylene glycol, propylene glycol, hexylene glycol, glycol ethers such as ethyl cellosolve, butyl cellosolve, ethyl carbitol / butyl carbitol, fats such as hexane, heptane / octane, etc. Aromatic hydrocarbons such as aromatic hydrocarbons, halogenated hydrocarbons, benzene, toluene and xylene, N-methylpyrrolidone, dimethylformamide and the like, and one kind or a mixture of two or more kinds It may be used as an object, but is not limited thereto.

  Examples of the binder used in the coating liquid of the present invention include ionizing radiation curable resins and thermosetting resins such as ultraviolet curable resins and electron beam curable resins. Agent is included.

  Examples of the ionizing radiation curable resin include polyfunctional acrylate resins such as polyhydric alcohol acrylic acid or methacrylic acid ester, diisocyanate, polyhydric alcohol and acrylic acid or methacrylic acid hydroxy ester. Examples include functional urethane acrylate resins. Besides these, polyether resins having an acrylate functional group, polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and the like can also be used.

  Examples of the thermosetting resin include thermosetting urethane resins, phenol resins, urea melamine resins, epoxy resins, unsaturated polyester resins, and silicone resins.

  Any photopolymerization initiator may be used as long as it generates radicals when irradiated with active energy rays. For example, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropane-1- ON, 2-methyl [4- (methylthio) phenyl] morpholinopropan-1-one, 2,2-dimethoxy-1,2-diphenylethane-1-one, benzophenone, 1- [4- (2-hydroxyethoxy) ) Phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one, bis (2,6- And dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide. 0.1-10 mass parts is preferable with respect to 10-80 mass parts of active energy ray hardening monomers, and, as for the addition amount of a photoinitiator, 1-7 mass parts is more preferable, and 1-5 mass parts is. Further preferred.

  As the base material used in the present invention, various materials can be used depending on applications. Examples of the component constituting the substrate include cellulose films such as acetyl cellulose and triacetyl cellulose, polyester films such as polyethylene terephthalate and polyethylene naphthalate, acrylic films such as polymethyl methacrylate, and the like. It is not limited to. Further, the substrate may be composed of a single layer or a plurality of layers. In general, a substrate having a thickness of 10 μm or more and 500 μm or less is used.

(Example)
Next, examples will be described.
A triacetyl cellulose (TAC) substrate having a width of 1000 mm and a thickness of 80 μm is coated with an extrusion type die head using an extrusion type die head using ethyl acetate as a solvent and an acrylic resin as a binder and a solid content concentration of 50 wt%. The coating film 5 was conveyed in a drying apparatus 2 of 0.0 m at a conveyance speed of 30 m / min.
Both the height L1 of the base material 4 and the top plate side gap and the height L2 of the base material and the bottom plate side gap are 15 mm. The drying device 2 used here was one in which eight zones of 1.0 m long drying paths were arranged.

  As the air conditioning member 22, two punching metals having an opening ratio of 20%, a hole diameter of 3 mm, and a thickness of 2 mm are provided facing the air supply port 9 as the first porous member 24, and the opening ratio is provided as the second porous member 23. One sheet of wire net having 60%, a hole diameter of 1 mm, and a thickness of 1 mm is provided facing the coating film 5.

  At this time, no unevenness such as wind ripples was found on the coating film after drying.

  On the other hand, when the air conditioning member 22 was not used and the other conditions were the same, clear unevenness was confirmed on the coating film 5 after drying.

Moreover, the air conditioning member 22 was created on the conditions different from the above.
As the air conditioning member 22, two punching metals having an opening ratio of 20%, a hole diameter of 3 mm, and a thickness of 2 mm are provided facing the air supply port 9 as the first porous member 24, and the opening is provided as the second porous member 23. A wire net having a rate of 30%, a hole diameter of 1 mm, and a thickness of 1 mm was provided facing the coating film 5.
In this case, the condition is improved as compared with the case where the air conditioning member 22 is not provided, but unevenness such as a wind pattern occurs in a part on the supply side.

  From the result of comparing the unevenness of the coating film after drying, the present invention has an effect of reducing unevenness.

It is the side surface schematic when the manufacturing apparatus of a coated material is seen from the side. It is A-A 'cross-sectional schematic of a drying apparatus. It is a side schematic diagram when an example of a wind regulation member is seen from the side.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1a ... Coating apparatus, 1b ... Coating part, 2 ... Drying apparatus, 3a-3c ... Drying path, 4 ... Base material, 5 ... Coating film, 6 ... Coating film conveyance part, 9 ... Supply Air port, 10 ... Exhaust port, 11 ... Top plate, 12 ... Bottom plate, 13 ... Inlet for the first drying path, 14 ... Exit for the last drying path, 15 ... Air 18 ... Air flow, 21 ... Second drying device, 22 ... Air conditioning member, 23 ... Second porous member, 24 ... Second porous member.

Claims (8)

In an apparatus for manufacturing a coating film, comprising: a coating apparatus that forms a coating film by applying a coating solution containing a solvent to a belt-shaped substrate being transported; and a drying apparatus that dries while transporting the coating film formed on the substrate. ,
The drying apparatus includes at least a drying path, an air supply port, an air supply unit, an exhaust port, an exhaust unit, and an air conditioning member.
The drying path includes a top plate and a bottom plate that are opposed to each other with the coating film sandwiched in a thickness direction thereof, a right side plate that is opposed to the coating film in a width direction and that connects both sides of the top plate and the bottom plate, and Comprising a left side plate,
A carry-in entrance is provided at an upstream end of the drying path in the transport direction of the coating film,
A carry-out port is provided at the downstream end of the drying path in the transport direction of the coating film,
The air supply port is disposed on one of the right side plate and the left side plate of the drying path,
The air supply means supplies air into the drying path through the air supply port,
The exhaust port is disposed on the other of the left side plate or the right side plate,
The exhaust means exhausts air from the inside of the drying path through the exhaust port,
The air conditioning member is disposed in the air supply port,
The air conditioning member includes a planar first porous member and a second porous member that extend along the right side plate or the left side plate and face each other.
The first porous member is disposed so as to face the air supply port,
The second porous member is disposed so as to face the coating film,
The first porous member comprises one or more planar members having a hole diameter of 2 mm to 10 mm and an aperture ratio of 10% to 30%,
The second porous member comprises one or more planar members having a hole diameter of 0.1 mm or more and less than 2 mm and an aperture ratio of 40% or more and 99% or less.
An apparatus for producing a coating film, comprising: The coating apparatus includes a coating unit that coats the coating liquid on the substrate to form the coating film,
The coating film transport distance from the coating unit to the carry-in port facing the coating unit is in the range of 0.2 m or more and 0.8 m or less.
The manufacturing apparatus of the coating film of Claim 1 characterized by the above-mentioned. The top plate is located on the side of the substrate on which the coating film is formed, the bottom plate is located on the side opposite to the side on which the coating film of the substrate is formed, and the distance between the top plate and the coating film is measured on the ceiling. The height L1 and the height L2 satisfy the relationship of L1 ≦ L2 when the height L1 of the plate-side gap and the distance between the bottom plate and the base material is the height L2 of the bottom-plate-side gap.
The coating film manufacturing apparatus according to claim 1, wherein the coating film manufacturing apparatus is a coating film manufacturing apparatus.   The apparatus for producing a coating film according to any one of claims 1 to 3, wherein a distance between the top plate and the bottom plate is in a range of 10 mm to 100 mm. The air supply port has an air supply port opening which is opened in one of the right side plate or the left side plate,
The exhaust port has an exhaust port opening opened to the other of the right side plate or the left side plate,
The heights of the air supply opening and the exhaust opening along the direction in which the top plate and the bottom plate face each other substantially coincide with the distance between the top plate and the bottom plate.
The manufacturing apparatus of the coating film in any one of Claims 1-4 characterized by the above-mentioned.   An optical film formed using the manufacturing apparatus according to claim 1. A coating step of applying a coating solution containing a solvent to the belt-shaped substrate being transported to form a coating film, and a drying step of drying the coating film formed on the substrate while being transported in a drying path In the manufacturing method of the coating film containing,
An air supply port and an air conditioning member are arranged in the drying path,
The air conditioning member includes a planar first porous member and a second porous member that extend on a surface intersecting with an extended surface of the coating film of the substrate to be conveyed and face each other. Configure
Arranging the first porous member facing the air supply port;
Arranging the second porous member so as to face the coating film,
The first porous member comprises one or more planar members having a hole diameter of 2 mm or more and 10 mm or less and an aperture ratio of 10% or more and 30% or less,
The second porous member comprises one or more planar members having a pore diameter of 0.1 mm or more and less than 2 mm and an aperture ratio of 40% or more and 99% or less,
Air was allowed to flow on the coating film from the air supply port through the air conditioning member.
The manufacturing method of the coating film characterized by the above-mentioned. In a drying apparatus for a coated product that is dried while transporting a coating film formed on a substrate,
At least a drying path, an air supply port, an air supply unit, an exhaust port, an exhaust unit, and a wind control member,
The drying path includes a top plate and a bottom plate that are opposed to each other with the coating film sandwiched in a thickness direction thereof, a right side plate that is opposed to the coating film in a width direction and that connects both sides of the top plate and the bottom plate, and Comprising a left side plate,
A carry-in entrance is provided at an upstream end of the drying path in the transport direction of the coating film,
A carry-out port is provided at the downstream end of the drying path in the transport direction of the coating film,
The air supply port is disposed on one of the right side plate and the left side plate of the drying path,
The air supply means supplies air into the drying path through the air supply port,
The exhaust port is disposed on the other of the left side plate or the right side plate,
The exhaust means exhausts air from the inside of the drying path through the exhaust port,
The air conditioning member is disposed in the air supply port,
The air conditioning member includes a planar first porous member and a second porous member that extend along the right side plate or the left side plate and face each other.
The first porous member is disposed so as to face the air supply port,
The second porous member is disposed so as to face the coating film,
The first porous member comprises one or more planar members having a hole diameter of 2 mm to 10 mm and an aperture ratio of 10% to 30%,
The second porous member comprises one or more planar members having a hole diameter of 0.1 mm or more and less than 2 mm and an aperture ratio of 40% or more and 99% or less.
An apparatus for drying a coating film, comprising:

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