JP2008302297A - Drying device and drying method of coated film, and manufacturing apparatus and manufacturing method of coated object using them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drying device and a drying method of a coated film, which can stabilize an evaporation rate of an organic solvent in the coated film, and suppress occurrence of slight unevenness of drying, and a manufacturing apparatus and a manufacturing method of a coated object using them. <P>SOLUTION: Flow of air generated inside a solvent removing part is to be parallel to a conveying direction of the coated film. The height L1 of a regulating member side clearance between a regulating member for separation and the coated film, and the height L2 of a bottom plate side clearance between a bottom plate and a substrate satisfy a relation of L1≤L2. The relation of a supply air volume D1 aerating in the solvent removing part using an air supply means and an exhaust volume D2 discharging air from the solvent removing part using an exhaust means is to be the supply air volume D1<the exhaust volume D2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating film drying apparatus and drying method, and a coating material manufacturing apparatus and manufacturing method using them. For example, in the antireflection film, the difference in film thickness is sensitively reflected in the light transmittance, so that a film thickness unevenness with an error of 1% or less is recognized as a product defect. The present invention relates to a coating film drying apparatus and a drying method with high precision as described above, and a coating material manufacturing apparatus and manufacturing method using them.

  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.

  As a method for drying a coating film containing an organic solvent in a coating solution, there is a method of applying a dry gas to the coating film surface. In Patent Document 1, a dry gas is applied as a laminar flow in a wind direction parallel to the coating film surface. In Patent Document 2, a dry gas is applied perpendicular to the coating film surface. In both cases, the dry gas is a uniform laminar flow, and the air is conditioned by using a conditioned member. Such a method is effective when the coating film transport speed is low, but it has been pointed out that when the transport speed is high, the coating film surface is uneven by applying a dry gas.

  A method for preventing dry gas from coming into contact with a coating film is also known. Patent Document 3 proposes a drying method and apparatus for exhausting the solvent evaporated through the air conditioning member to the exhaust chamber. Since the dry gas does not come into contact with the coating film, turbulent flow hardly occurs on the coating film surface, and temperature variation hardly occurs. For this reason, there exists an advantage that the film thickness nonuniformity by these turbulent flow and temperature nonuniformity does not arise easily.

  However, since the organic solvent that evaporates from the coating film is pulled by the air flow (entrained flow) generated by the conveyance of the coating film, the amount of accumulation increases toward the carry-out side to carry out the coating film. According to the method described in Patent Document 3 in which an air flow in the width direction of the support is generated in the exhaust chamber, it is not possible to efficiently remove the evaporated solvent distributed on the carry-out side, resulting in a decrease in the drying speed. There was a drawback of doing.

Prior art documents are shown below.
JP 2002-340479 A JP 2001-314799 A JP 2003-93954 A

  The problem in the present invention is that the evaporation solvent on the coating film surface can be efficiently removed by making the air flow generated in the solvent removal portion parallel to the transport direction of the coating film, so that the drying speed is constant. It is intended to provide a coating film drying apparatus and drying method, and a coated product manufacturing apparatus and manufacturing method using the coating film drying apparatus and the drying method capable of maintaining slight drying unevenness.

The invention described in claim 1 is a coating apparatus that forms a coating film by applying a coating solution containing an organic solvent to a belt-shaped substrate being transported, and drying that transports the coating film formed on the substrate. In an apparatus for producing a coated product having a device,
The drying apparatus includes at least a top plate installed on the side on which the coating film of the base material is formed, a bottom plate installed on the side opposite to the side on which the coating film of the base material is formed, a right side plate, and a left side. A drying zone having a plate, a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and being arranged in one or more zones in the carrying direction of the coating film;
A coating film transport section provided with the carry-in port and the carry-out port, for transporting the coating film, and disposed on the bottom plate side;
A solvent removal unit disposed on the top plate side;
Separating the coating film transport unit and the solvent removing unit, and a separation wind-control member installed on the side of the base material on which the coating film is formed;
An air inlet arranged on the top plate of each drying zone;
An exhaust port arranged on the top plate of each drying zone;
An air supply means for forcibly supplying air into the solvent removal section through the air supply opening, or an exhaust means for forcibly exhausting air from the solvent removal section through the exhaust opening, or both, An airflow generating means selected from:
With
An apparatus for producing a coated product, characterized in that the air flow generated in the solvent removal section using the air flow generating means is parallel to the transport direction of the coating film.

  The invention according to claim 2 is characterized in that the flow of air generated in the solvent removal section using the air supply means and the exhaust means is the same and parallel to the transport direction of the coating film. 1 is an apparatus for producing a coated product according to 1;

  According to a third aspect of the present invention, the height L1 of the airflow adjustment member side gap between the separation airflow adjustment member and the coating film, and the height L2 of the bottom plate side gap between the bottom plate and the base material, Satisfying the relationship of L1 ≦ L2 is a coated product manufacturing apparatus according to claim 1 or 2.

  According to a fourth aspect of the present invention, there is provided an air supply amount D1 for supplying air into the solvent removal unit using the air supply unit, and an exhaust air amount D2 for exhausting air from the solvent removal unit using the exhaust unit. The relationship is a supply air volume D1 <exhaust air volume D2, which is a device for manufacturing a coated product according to any one of claims 1 to 3.

  The invention according to claim 5 is an optical film formed using the manufacturing apparatus according to any one of claims 1 to 4.

The invention according to claim 6 is a coating step in which a coating solution containing an organic solvent is applied to a belt-like substrate being conveyed to form a coating film, and then the coating film formed on the substrate is placed in a drying zone. In the manufacturing method of the coated product having a drying step of drying while transported in,
The drying zone includes a top plate installed on the side on which the coating film of the base material is formed, a bottom plate installed on the side opposite to the side on which the coating film of the base material is formed, a right side plate, and a left side plate. And a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and one or more zones are arranged in the carrying direction of the coating film,
An application step of applying a coating liquid containing an organic solvent to the belt-shaped substrate being transported to form a coating film;
Next, a transporting process for transporting the coating film from the coating part of the coating process to the inlet of the drying zone for first transporting the coating film,
Next, a carrying-in process for carrying in the drying zone carrying in the coating film first,
Next, it is provided with a carry-in port and a carry-out port, conveys the coating film, and is disposed on the bottom plate side, a solvent removal unit disposed on the top plate side, a coating film conveyance unit, and a solvent Separating the removal section and separating air conditioning member installed on the side where the coating film of the substrate is formed, the air supply port arranged on the top plate of each drying zone, and the top plate of each drying zone An arranged exhaust port and an air supply means for forcibly supplying air into the solvent removal unit through the air supply port, or an exhaust unit for forcibly exhausting air from the solvent removal unit through the exhaust port, Or an airflow generating means selected from both of them, the airflow generated in the solvent removal unit using the airflow generating means is parallel to the transport direction of the coating film, and the separation air conditioning member and the coating The height L1 of the air conditioning member side gap between the membrane and the height L2 of the bottom plate side gap between the bottom plate and the base material , But a drying step of drying the coating film while conveying in one zone or more drying zones that satisfy the relation of L1 ≦ L2,
Next, an unloading step of unloading the coating film from the unloading port of the drying zone where the coating film is finally unloaded,
It is a manufacturing method of the coated material characterized by having.

The invention according to claim 7 is a coating film drying method in which a coating liquid containing an organic solvent is applied to a belt-shaped substrate being conveyed to form a coating film, and the coating film formed on the substrate is dried while being conveyed. In the device
At least a top plate installed on the side on which the coating film of the substrate is formed, a bottom plate installed on the side opposite to the side on which the coating film of the substrate is formed, a right side plate, a left side plate, and the coating A drying zone having a carry-in port for carrying in the film and a carry-out port for carrying out the coating film, and being arranged in one or more zones in the conveying direction of the coating film;
A coating film transport section provided with the carry-in port and the carry-out port, for transporting the coating film, and disposed on the bottom plate side;
A solvent removal unit disposed on the top plate side;
Separating the coating film transport unit and the solvent removing unit, and a separation wind-control member installed on the side of the base material on which the coating film is formed;
An air inlet arranged on the top plate of each drying zone;
An exhaust port arranged on the top plate of each drying zone;
An air supply means for forcibly supplying air into the solvent removal section through the air supply opening, or an exhaust means for forcibly exhausting air from the solvent removal section through the exhaust opening, or both, An airflow generating means selected from:
With
The flow of air generated in the solvent removal unit using the airflow generation means is parallel to the transport direction of the coating film,
And the height L1 of the airflow adjustment member side gap between the separation airflow adjustment member and the coating film and the height L2 of the bottom plate side gap between the bottom plate and the base material are in a relationship of L1 ≦ L2. The coating film drying apparatus is characterized in that:

The invention according to claim 8 is a coating step in which a coating solution containing an organic solvent is applied to a belt-like substrate being conveyed to form a coating film, and then the coating film formed on the substrate is placed in a drying zone. In the drying method of the coating film having a drying step of drying while transporting in
The drying zone includes a top plate installed on the side on which the coating film of the base material is formed, a bottom plate installed on the side opposite to the side on which the coating film of the base material is formed, a right side plate, and a left side plate. And a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and one or more zones are arranged in the carrying direction of the coating film,
An application step of applying a coating liquid containing an organic solvent to the belt-shaped substrate being transported to form a coating film;
Next, a transporting process for transporting the coating film from the coating part of the coating process to the inlet of the drying zone for first transporting the coating film,
Next, a carrying-in process for carrying in the drying zone carrying in the coating film first,
Next, it is provided with a carry-in port and a carry-out port, conveys the coating film, and is disposed on the bottom plate side, a solvent removal unit disposed on the top plate side, a coating film conveyance unit, and a solvent Separating the removal section and separating air conditioning member installed on the side where the coating film of the substrate is formed, the air supply port arranged on the top plate of each drying zone, and the top plate of each drying zone An arranged exhaust port and an air supply means for forcibly supplying air into the solvent removal unit through the air supply port, or an exhaust unit for forcibly exhausting air from the solvent removal unit through the exhaust port, Or an airflow generating means selected from both of them, the airflow generated in the solvent removal unit using the airflow generating means is parallel to the transport direction of the coating film, and the separation air conditioning member and the coating The height L1 of the air conditioning member side gap between the membrane and the height L2 of the bottom plate side gap between the bottom plate and the base material , But a drying step of drying the coating film while conveying in one zone or more drying zones that satisfy the relation of L1 ≦ L2,
Next, an unloading step of unloading the coating film from the unloading port of the drying zone where the coating film is finally unloaded,
It is a drying method of the coating film characterized by having.

  According to the present invention, since the flow of air generated in the solvent removal unit is parallel to the transport direction of the coating film, the evaporated solvent whose amount of accumulation increases toward the carry-out side is efficiently removed. As a result, the drying speed can be kept constant, and the occurrence of slight drying unevenness can be suppressed.

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 zones 3a to 3d. Each of the drying zones 3a to 3d has a carry-in port and a carry-out port, conveys a coating film, and is disposed on the bottom plate 12 side. The film transport unit 6, the solvent removal unit 7 disposed on the top plate 11 side, the separation air conditioning member 8 that separates the coating film transport unit 6 and the solvent removal unit 7, and the air supply disposed on the top plate 11 Also shown are an inlet 9, an exhaust outlet 10 arranged on the top plate 11, and an air supply means (not shown) for forcibly supplying air into the solvent removal section 7 through the air supply opening 9. Although not shown, it is composed of an exhaust means for forcibly exhausting air from the solvent removal section 7 through an exhaust port, and an inlet 13 of the drying zone 3a to which the coating film is first transported.

FIG. 2 is a schematic cross-sectional view (the transport direction of the coating film) of the drying zones 3a to 3d shown in FIG. Air is supplied into the solvent removal unit 7 using the air supply means, and air is exhausted from the solvent removal unit 7 using the exhaust means, thereby generating an air flow 15 in the solvent removal unit 7. Yes.
The organic solvent evaporated from the coating film 5 transported in the coating film transport unit 6 moves into the solvent removal unit 7 through the plurality of holes of the separation wind-control member 8. In the solvent removal unit 7, an air flow 15 is generated from the air supply port 9 toward the exhaust port 10, and the evaporated organic solvent is discharged from the solvent removal unit 7 through the exhaust port 10 together with the air flow 15. Exhausted.

  However, since the organic solvent evaporating from the coating film 5 is pulled by the air flow (entrained flow) generated by the conveyance of the coating film 5, the amount of accumulation increases toward the outlet side of each drying zone. . As will be described later in Example 1, by generating the air flow 15 in parallel with the transport direction of the coating film, the evaporated organic solvent can be efficiently removed, and as a result, the drying speed is kept constant. And the occurrence of slight drying unevenness can also be suppressed.

In addition, the air flow 15 in the drying zones 3a to 3d is the same as and parallel to the transport direction of the coating film 5, but this represents one embodiment of the present invention and is limited to this. It is not a thing. If it is parallel to the transport direction of the coating film 5, the air flow 15 may be generated in the direction opposite to the transport direction of the coating film 5.
However, it is more preferable to provide the exhaust port 10 on the carry-out side in order to efficiently remove the evaporated organic solvent in which the accumulated amount is distributed toward the carry-out side in each drying zone. That is, it is more preferable that the air flow 15 generated in the solvent removal unit 7 is the same and parallel to the transport direction of the coating film 5.

3 is a schematic cross-sectional view taken along the line AA ′ of the drying apparatus shown in FIG. As shown in FIG. 3, an air supply port 9 having an opening 16 of the air supply port is provided on the top plate of the drying zone 3a.
At this time, the height L1 of the air conditioning member side gap between the separation air conditioning member 8 and the coating film 5 formed on the base material 4 and the height L2 of the bottom plate side gap between the base material 4 and the bottom plate 12 are as follows. , L1 ≦ L2 is preferable. When the relationship of L1 ≦ L2 is satisfied, the 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 surface of the coating film 5. Can be improved.

  Further, the relationship between the air supply amount D1 for supplying air into the solvent removing unit 7 using the air supply unit and the exhaust air amount D2 for exhausting air from the solvent removing unit 7 using the exhaust unit is shown in FIG. It is preferable that the air volume D1 <the exhaust air volume D2. When the supply air volume D1 ≧ exhaust air volume D2, the flow of air generated in the solvent removal unit 7 is strongly influenced by supply air (air blowing), and unevenness due to air blowing may occur on the surface of the coating film 5. When the supply air volume D1 <the exhaust air volume D2, the air flow generated in the solvent removal unit 7 is strongly influenced by the exhaust (suction), so that a stable air flow can be generated.

  Further, in order not to provide a velocity distribution in the width direction of the coating film 5, the diameter of the opening 16 of the air supply port (the diameter in the width direction of the base material) and the diameter of the opening 17 of the exhaust port (shown in FIG. 2). It is preferable that (the diameter in the width direction of the base material) substantially matches the base material width. In this way, the air flow 15 is uniformly generated in the solvent removing unit 7, and the organic solvent evaporated from the coating film 5 can be removed stably.

  The drying device 2 in the present invention is installed in the range of 0.2 m or more and 0.8 m or less at a coating film transport distance 24 from the coating unit 1b of the coating device 1a. Here, the coating film transport distance 24 refers to the length along the substrate 4 to be transported, not the linear distance between the coating unit 1b and the carry-in port 13 of the drying zone 3a. If the coating film transport distance 24 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. Moreover, in order to prevent a non-uniform air flow, it is preferable that the coating apparatus 1a and the carry-in port 13 of the drying zone 3a are smoothly connected without any step.

  In FIG. 1, the coating film 5 formed on the substrate 4 is carried into the first drying zone 3a from the carry-in port 13 of the drying zone 3a that is first carried in, and from the carry-out port 14 of the drying zone 3d that is carried out last. It is carried out of the drying zone 3d. In FIG. 1, four zones of the drying zones 3a to 3d 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 zone may be arrange | positioned linearly, or may be arrange | positioned refractingly.

  In FIG. 1, one air supply port 9 and one air discharge port 10 are arranged in each drying zone (3 a to 3 d), which represents an embodiment of the present invention. The number of air supply ports 9 and exhaust ports 10 arranged for each drying zone 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 zone in the present invention has a box shape which is sealed to some extent in order to prevent disturbance such as wind and dust blown from outside the drying zone. 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 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 air volume of the air supply means and the exhaust means (supply air volume D1 and exhaust air volume D2). A blower capable of adjusting the flow of air in the solvent removal unit 7 can be used, but is not limited thereto.

As the air conditioning member 8 for separation in the present invention, a plate-like member in which a plurality of holes are formed, such as a wire mesh or a punching metal, can be used. The flow of air in the solvent removal unit 7 and the flow of evaporated organic solvent As long as it has a function to control the above, the opening shape of the hole, the opening ratio of the hole, and the like are not particularly limited. Here, the opening ratio of the hole is a value represented by (area of the opening of the hole / area of the air conditioning member) × 100 (%). Further, the material of the separation air-conditioning member 8 is not particularly limited as long as it has solvent resistance to the organic solvent contained in the coating liquid.
Further, as shown in FIG. 2, a windbreak plate 23 may be installed on the separation windbreak plate 8 so that the air from the air supply port does not directly touch the coating film.

  Further, as shown in FIGS. 2 and 3, the opening 16 of the air supply port and / or the opening 17 of the exhaust port in the present invention may be covered with a ventilation air conditioning member 22. This is because the air flow 15 can be made uniform. The ventilation air-conditioning member 22 used in the present invention is a plate-like member formed with a plurality of holes, such as a wire mesh, punching metal, etc. The aperture ratio and the like are not particularly limited. Further, the material of the ventilation air-conditioning member 8 is not particularly limited as long as it has solvent resistance to the organic solvent contained in the coating liquid.

The length of the drying device 2 in the present invention (the transport direction of the coating film) 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.
The length of the drying zone in the present invention (coating film conveyance direction) 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, but the drying apparatus 2 of the present invention is introduced only in the initial stage of drying including the inlet of the drying zone 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. 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 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 ester, diisocyanate, polyhydric alcohol and acrylic acid or methacrylic 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 1>
As Example 1, a drying apparatus 2 shown in FIG. 4 was used.
A polyethylene terephthalate (PET) substrate 4 having a width of 600 mm and a thickness of 75 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 transported at a transport speed of 30 m / min into the drying apparatus 2 having a length of 0.6 m comprising the solvent removing unit 7 and the coating film transporting unit 6 having a height of 30 mm. In the solvent removal unit 7, an air flow 15 having a wind speed of 30 m / min was generated in the same direction as and parallel to the transport direction of the coating film 5 using an air supply unit and an exhaust unit. The base material 4 and the coating film 5 formed on the base material 4 conveyed the separation air conditioning member 8 and the substantially center of the bottom plate (the height L1 of the air conditioning member side gap and the height L2 of the bottom plate side gap were both 15 mm). degree). The drying apparatus 2 used here was a one-zone arrangement of 0.6 m long drying zones. As the separation air-conditioning member 8, one having a hole diameter of 1 mm, a hole opening ratio of 22.6%, and a thickness of 0.8 mm was used.

<Example 2>
Drying was performed under the same conditions as in Example 1 except that the air flow 15 was generated in the direction opposite to the conveying direction of the coating film 5.

<Comparative Example 1>
Drying was performed under the same conditions as in Example 1 except that no air flow 15 was generated in the solvent removal unit 7.
<Comparative example 2>
Drying was performed under the same conditions as in Example 1 except that the separation air-conditioning member 8 was not used.

<Evaluation>
The degree of unevenness of the coating film surface was confirmed by visual observation after winding the substrate. The degree of unevenness is indicated by ○ ×, where ○ is small and does not cause a problem as a product, and × is a two-step evaluation where unevenness is conspicuous and cannot be used as a product. The results are shown in Table 1.

From Table 1, it was shown that it is useful that the flow of air generated in the solvent removal unit using the airflow generation means is parallel to the transport direction of the coating film.

The side schematic diagram when the manufacturing apparatus of the coating film of this invention is seen from the side. FIG. 2 is a schematic view of a cross-section (coating film conveyance direction) of the drying apparatus shown in FIG. 1. FIG. 2 is a schematic cross-sectional view of the drying apparatus shown in FIG. 1. FIG. 3 is a schematic view of a cross section (the transport direction of the coating film) of the drying apparatus shown in the first embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Coating device 1b Coating part 2 Drying device 3a-3d Drying zone 4 Base material 5 Coating film 6 Coating film conveyance part 7 Solvent removal part 8 Separation air-conditioning member 9 Air supply port 10 Exhaust port 11 Top plate 12 Bottom plate 13 Carry in first Carrying-in inlet 14 of the drying zone to be carried out Carrying-out outlet 15 of the drying zone finally carried out 15 Air flow 16 Air opening opening 17 Air outlet opening 18 Right side plate 19 Left side plate 20 Exhaust flow rate 21 Second drying device 22 For ventilation Wind control member 23 Windproof plate 24 Coating film transport distance

Claims (8)

An apparatus for producing a coated product, comprising: a coating apparatus that forms a coating film by applying a coating solution containing an organic solvent to a belt-shaped substrate being transported; and a drying apparatus that dries while transporting the coating film formed on the substrate. In
The drying apparatus includes at least a top plate installed on the side on which the coating film of the base material is formed, a bottom plate installed on the side opposite to the side on which the coating film of the base material is formed, a right side plate, and a left side. A drying zone having a plate, a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and being arranged in one or more zones in the carrying direction of the coating film;
A coating film transport section provided with the carry-in port and the carry-out port, for transporting the coating film, and disposed on the bottom plate side;
A solvent removal unit disposed on the top plate side;
Separating the coating film transport unit and the solvent removing unit, and a separation wind-control member installed on the side of the base material on which the coating film is formed;
An air inlet arranged on the top plate of each drying zone;
An exhaust port arranged on the top plate of each drying zone;
An air supply means for forcibly supplying air into the solvent removal section through the air supply opening, or an exhaust means for forcibly exhausting air from the solvent removal section through the exhaust opening, or both, An airflow generating means selected from:
With
An apparatus for producing a coated product, characterized in that the air flow generated in the solvent removal section using the air flow generating means is parallel to the transport direction of the coating film.   The apparatus for producing a coated product according to claim 1, wherein the flow of air generated in the solvent removing unit using the air supply means and the exhaust means is the same as and parallel to the transport direction of the coating film. .   The height L1 of the airflow adjustment member side gap between the separation airflow adjustment member and the coating film and the height L2 of the bottom plate side gap between the bottom plate and the base material satisfy the relationship of L1 ≦ L2. The apparatus for producing a coated product according to claim 1, wherein   The relationship between the supply air amount D1 for supplying air into the solvent removal unit using the air supply unit and the exhaust air amount D2 for exhausting air from the solvent removal unit using the exhaust unit is as follows. The apparatus for producing a coated product according to any one of claims 1 to 3, wherein the air volume is D2.   An optical film formed using the manufacturing apparatus according to claim 1. A coating step in which a coating liquid containing an organic solvent is applied to a belt-shaped substrate being transported to form a coating film; and a drying step in which the coating film formed on the substrate is dried while being transported in a drying zone; In a method for producing a coated product having
The drying zone includes a top plate installed on the side on which the coating film of the base material is formed, a bottom plate installed on the side opposite to the side on which the coating film of the base material is formed, a right side plate, and a left side plate. And a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and one or more zones are arranged in the carrying direction of the coating film,
An application step of applying a coating liquid containing an organic solvent to the belt-shaped substrate being transported to form a coating film;
Next, a transporting process for transporting the coating film from the coating part of the coating process to the inlet of the drying zone for first transporting the coating film,
Next, a carrying-in process for carrying in the drying zone carrying in the coating film first,
Next, it is provided with a carry-in port and a carry-out port, conveys the coating film, and is disposed on the bottom plate side, a solvent removal unit disposed on the top plate side, a coating film conveyance unit, and a solvent Separating the removal section and separating air conditioning member installed on the side where the coating film of the substrate is formed, the air supply port arranged on the top plate of each drying zone, and the top plate of each drying zone An arranged exhaust port and an air supply means for forcibly supplying air into the solvent removal unit through the air supply port, or an exhaust unit for forcibly exhausting air from the solvent removal unit through the exhaust port, Or an airflow generating means selected from both of them, the airflow generated in the solvent removal unit using the airflow generating means is parallel to the transport direction of the coating film, and the separation air conditioning member and the coating The height L1 of the air conditioning member side gap between the membrane and the height L2 of the bottom plate side gap between the bottom plate and the base material , But a drying step of drying the coating film while conveying in one zone or more drying zones that satisfy the relation of L1 ≦ L2,
Next, an unloading step of unloading the coating film from the unloading port of the drying zone where the coating film is finally unloaded,
The manufacturing method of the coating material characterized by having. In a coating film drying apparatus that applies a coating liquid containing an organic solvent to a belt-shaped substrate being transported to form a coating film, and dries while transporting the coating film formed on the substrate.
At least a top plate installed on the side on which the coating film of the substrate is formed, a bottom plate installed on the side opposite to the side on which the coating film of the substrate is formed, a right side plate, a left side plate, and the coating A drying zone having a carry-in port for carrying in the film and a carry-out port for carrying out the coating film, and being arranged in one or more zones in the conveying direction of the coating film;
A coating film transport section provided with the carry-in port and the carry-out port, for transporting the coating film, and disposed on the bottom plate side;
A solvent removal unit disposed on the top plate side;
Separating the coating film transport unit and the solvent removing unit, and a separation wind-control member installed on the side of the base material on which the coating film is formed;
An air inlet arranged on the top plate of each drying zone;
An exhaust port arranged on the top plate of each drying zone;
An air supply means for forcibly supplying air into the solvent removal section through the air supply opening, or an exhaust means for forcibly exhausting air from the solvent removal section through the exhaust opening, or both, An airflow generating means selected from:
With
The flow of air generated in the solvent removal unit using the airflow generation means is parallel to the transport direction of the coating film,
And the height L1 of the airflow adjustment member side gap between the separation airflow adjustment member and the coating film and the height L2 of the bottom plate side gap between the bottom plate and the base material are in a relationship of L1 ≦ L2. An apparatus for drying a coating film, wherein A coating step in which a coating liquid containing an organic solvent is applied to a belt-shaped substrate being transported to form a coating film; and a drying step in which the coating film formed on the substrate is dried while being transported in a drying zone; In the drying method of the coating film having
The drying zone includes a top plate installed on the side on which the coating film of the base material is formed, a bottom plate installed on the side opposite to the side on which the coating film of the base material is formed, a right side plate, and a left side plate. And a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and one or more zones are arranged in the carrying direction of the coating film,
An application step of applying a coating liquid containing an organic solvent to the belt-shaped substrate being transported to form a coating film;
Next, a transporting process for transporting the coating film from the coating part of the coating process to the inlet of the drying zone for first transporting the coating film,
Next, a carrying-in process for carrying in the drying zone carrying in the coating film first,
Next, it is provided with a carry-in port and a carry-out port, conveys the coating film, and is disposed on the bottom plate side, a solvent removal unit disposed on the top plate side, a coating film conveyance unit, and a solvent Separating the removal section and separating air conditioning member installed on the side where the coating film of the substrate is formed, the air supply port arranged on the top plate of each drying zone, and the top plate of each drying zone An arranged exhaust port and an air supply means for forcibly supplying air into the solvent removal unit through the air supply port, or an exhaust unit for forcibly exhausting air from the solvent removal unit through the exhaust port, Or an airflow generating means selected from both of them, the airflow generated in the solvent removal unit using the airflow generating means is parallel to the transport direction of the coating film, and the separation air conditioning member and the coating The height L1 of the air conditioning member side gap between the membrane and the height L2 of the bottom plate side gap between the bottom plate and the base material , But a drying step of drying the coating film while conveying in one zone or more drying zones that satisfy the relation of L1 ≦ L2,
Next, an unloading step of unloading the coating film from the unloading port of the drying zone where the coating film is finally unloaded,
A method for drying a coating film, comprising:

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