JP2008249282A - Apparatus and method for manufacturing coating object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing a coating object, capable of maintaining a drying rate faster than that at least in a natural seasoning while suppressing occurrence of even a few drying spot, and improving the flatness and the productivity. <P>SOLUTION: A drying zone in which an air supply port is arranged at a right-hand side plate and a drying zone in which an air supply port is arranged at a left-hand side plate are arranged alternately even number by even number in a conveying direction of a coating film. A conveying distance of the coating film from a coating section of the coating apparatus to a carrying-in port of the first drying zone ranges between 0.2 and 0.8 m, and a pressure difference between a pressure in the drying zone and a pressure outside the drying zone ranges between -2 to 2 Pa. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus and a method for manufacturing a coated product. In particular, it is used in the production of 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 is recognized as a defect on the product.

  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, in Patent Document 2, it is proposed to lower the wind speed of the drying air on the film surface 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 an apparatus and a method for manufacturing a coated product that can maintain a drying speed faster than at least natural drying while suppressing generation of slight drying unevenness, and can improve surface properties and productivity. That is.

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, a bottom plate, a right side plate, a left side plate, a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and the coating film. A drying zone arranged in two or more zones in the transport direction of
An air inlet arranged on either the right side plate or the left side plate of each drying zone;
An air supply means for supplying air into the drying zone through the air supply port;
An exhaust port disposed on either the left side plate or the right side plate of each drying zone facing the air supply port;
Exhaust means for exhausting air from within the drying zone through the exhaust port;
With
The drying zone in which the air supply port is arranged on the right side plate and the drying zone in which the air supply port is arranged on the left side plate are alternately arranged in the transport direction of the coating film. This is a membrane manufacturing apparatus.

  According to a second aspect of the present invention, the coating film transport distance from the coating unit of the coating apparatus to the inlet of the drying zone for first transporting the coating film is in the range of 0.2 m to 0.8 m. An apparatus for producing a coated product according to claim 1.

The invention according to claim 3 is an external pressure measuring means for measuring the pressure outside the drying zone;
An internal pressure measuring means for measuring the pressure in each drying zone;
The pressure difference between the pressure outside the drying zone measured by the external pressure measuring means and the pressure inside the drying zone measured by the internal pressure measuring means, and the pressure in the adjacent drying zone measured by the internal pressure measuring means. Differential pressure calculation means for calculating the differential pressure of the pressure,
An air supply amount of air supplied to each drying zone by the air supply means or an exhaust means so that the differential pressure calculated by the differential pressure calculation means is in a range of −2 Pa to 2 Pa. Control means for controlling the amount of air exhausted from each drying zone, or both;
The coating film manufacturing apparatus according to claim 1, wherein the coating film manufacturing apparatus is provided.

  The invention according to claim 4 is an optical film formed by using the manufacturing apparatus according to any one of claims 1 to 3.

The invention according to claim 5 is a coating step in which a coating solution containing an organic 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 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, a bottom plate, a right side plate, a left side plate, a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film. An even number is arranged in the transport direction,
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, an air supply port arranged on either the right side plate or the left side plate of each drying zone, an air supply means for supplying air into the drying zone through the air supply port, and the air supply port are opposed to each other. An exhaust port disposed on either the left side plate or the right side plate of each drying zone, and an exhaust means for exhausting air from the inside of the drying zone via the exhaust port, the air supply port being disposed on the right side plate A drying step in which the drying zone and the drying zone in which the air supply port is arranged on the left side plate are dried while being conveyed in the drying zone that is alternately arranged in two or more zones in the conveying direction of the coating film;
Next, a step of unloading the coating film from the outlet of the drying zone where the coating film is finally unloaded,
It is a manufacturing method of the coated material characterized by having.

  In a sixth aspect of the invention, the coating film transport distance from the coating section of the coating process to the inlet of the drying zone for first transporting the coating film is in the range of 0.2 m to 0.8 m. It is a manufacturing method of the coating material of Claim 5 characterized by these.

According to a seventh aspect of the present invention, there is provided an external pressure measuring means for measuring the pressure outside the drying zone, an internal pressure measuring means for measuring the pressure inside each drying zone, and the outside of the drying zone measured by the external pressure measuring means. The differential pressure calculation for calculating the differential pressure between the pressure in the drying zone measured by the internal pressure measuring means and the differential pressure between the pressures in the adjacent drying zones measured by the internal pressure measuring means Means,
The air supply means supplies air into each drying zone so that the differential pressure calculated by the differential pressure calculation means is in the range of −2 Pa to 2 Pa, or the exhaust means The apparatus for producing a coating film according to claim 5 or 6, wherein the exhaust amount of the air exhausted from the inside of the zone or both are controlled by the control means.

  Invention of Claim 8 was formed using the manufacturing method in any one of Claims 5-7, It is an optical film characterized by the above-mentioned.

  By using the production apparatus and production method of the coated product in the present invention, it is possible to maintain a drying speed faster than at least natural drying while suppressing slight drying unevenness, and to improve surface and productivity. it can.

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 10 in the coating unit 1b of the coating apparatus 1a. The substrate 10 on which the coating film is formed is conveyed to the drying device 2. The drying device 2 includes four zones of the drying zones 3a to 3d, an air supply port 6 disposed on either the right side plate or the left side plate of the drying zone, and the left side plate or the right side of the drying zone facing the air supply port 6. An exhaust port 7 arranged on one of the plates, an air supply means for supplying air into the drying zone through an air supply port 6 (not shown), and an exhaust port 7 (not shown). And exhaust means for exhausting air from the inside of the drying zone.
Here, the drying zone in which the air supply port 6 is arranged on the right side plate and the drying zone in which the air supply port 6 is arranged on the left side plate are alternately arranged in the conveyance direction of the base material 10.

  Further, the internal pressure measuring means 8 for measuring the pressure in each of the drying zones 3a to 3d, the external pressure measuring means 9 for measuring the pressure outside the drying zone, and the external pressure measuring means 9 (not shown) were measured. The difference for calculating the differential pressure between the pressure outside the drying zone and the pressure inside the drying zone measured by the internal pressure measuring means 8 and the pressure difference between the adjacent drying zones measured by the internal pressure measuring means 8. Based on the differential pressure calculated by the pressure calculation means and the differential pressure calculation means (not shown), the air supply means supplies the air into the drying zone, or the exhaust means is outside the drying zone. It is preferable that a control means for controlling the exhaust amount of the air to be exhausted or both of them is provided.

  The coating film formed on the base material 10 is carried into the first drying zone 3a from the carrying-in port 4 of the drying zone 3a that is first carried in, and then out of the drying zone 3d through the carrying-out port 5 of the drying zone 3d that is carried out last. It is carried out. In FIG. 1, four drying zones 3 a to 3 d are linearly arranged, and the first drying zone 3 a and the third drying zone 3 c are directed to the right side plate toward the conveyance direction of the substrate 10. 6 and an exhaust port 7 on the left side plate. The second drying zone 3b and the last drying zone 3d have an air supply port 6 on the left side plate and an exhaust port 7 on the right side plate in the conveyance direction of the substrate 10. Further, one internal pressure measuring means 8 is installed in each of the drying zones 3a to 3d, and one external pressure measuring means 9 is installed near the carry-in port 4 of the first drying zone 3a. 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.

  FIG. 2 is a schematic cross-sectional view taken along the line A-A ′ of the drying apparatus illustrated in FIG. 1. An air supply port 6 having an air supply port opening 15 is provided on the right side plate of the drying zone 3a, and an exhaust port opening 16 is provided at a position facing the air supply port 6 of the left side plate of the drying zone 3a. An exhaust port 7 is provided. In the present invention, air is supplied from the air supply port 6 into the drying zone 3a by using the air supply means, and air is exhausted from the inside of the drying zone 3a by using the exhaust means from the exhaust port 7. That is, an air flow 17 is generated from the air supply port 6 toward the exhaust port 7 in a direction perpendicular to the conveyance direction of the base material 10. Here, there is no limitation on the number of air supply ports 6 and exhaust ports 7 arranged with respect to the entire length of the drying zone.

  FIG. 3 is a schematic plan view when the drying apparatus shown in FIG. 1 is viewed from the top plate side. In the drying zone 3a and the drying zone 3c, an air flow 17 is generated from the right side to the left side in the conveyance direction of the base material 10, but in the drying zone 3b and the drying zone 3d, the air flow direction 17 is directed in the conveyance direction of the base material 10. There is an air flow from the left side to the right side. Thus, by alternating the air flow, the wind speed history in the width direction of the base material 10 received by the coating film 11 on the base material 10 is made substantially the same, and the coating film 11 is formed without causing unevenness in the width direction. Can be dried. Further, the number of drying zones in which the air flow 17 is from the right side to the left side in the conveyance direction of the substrate 10 and the number of drying zones in which the air flow 17 is from the left side to the right side in the conveyance direction of the substrate 10. Are preferably the same number. The wind speed history in the width direction of the substrate 10 received by the coating film 11 on the substrate 10 becomes substantially the same, and the coating film 11 can be dried without causing unevenness in the width direction.

  The drying apparatus shown in FIGS. 1 to 3 represents an embodiment of the present invention, and in the first drying zone 3a, an air flow is generated from the left side to the right side in the conveyance direction of the base material 10. It is sufficient that the air flow in the adjacent drying zones is alternately reversed. Moreover, although four drying zones 3a-3d are shown in FIG. 1, if the drying zone of 2 zones is arrange | positioned, there will be no restriction | limiting in the number.

  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 device 2 in the present invention is preferably installed in the range of 0.2 m to 0.8 m at a coating film transport distance 18 from the coating unit 1b of the coating device 1a. Here, the coating film transport distance 18 is not a linear distance between the coating unit 1b and the inlet 4 of the drying zone 3a into which the coating film 11 is first transported, but the length along the substrate 10 to be transported. Pointing. Although the conveyance speed of the base material 10 is not a restriction | limiting matter, the drying apparatus 2 which has a general speed | rate about 20 m / min or more and 100 m / min or less is used. If the coating film transport distance 18 is longer than 0.8 m, the naturally drying region cannot be ignored, and unevenness due to natural drying occurs, which is not preferable. Also, if it is less than 0.2 m, the outside air is blocked at the carry-in port 4 of the drying zone 3a into which the substrate 10 is carried first, which is not preferable.

  The drying zone in the present invention has a cylindrical shape or a box shape. A carry-in port for carrying in the substrate 10, a carry-out port installed facing the carry-out port, the top plate 13 installed on the side of the substrate 10 on which the coating film 11 is formed, A bottom plate 14 installed facing the top plate 13 across the material 10, a right side facing the conveying direction of the base material 10, and a right side plate installed in the width direction of the base material 10, and facing the right side plate And the left side plate installed. Here, it does not matter whether the coating film 11 is formed on the upper surface side in the gravity direction or the coating film 11 is formed on the lower surface side of the substrate 10 to be conveyed.

  As the air supply means and exhaust means in the present invention, a blower is generally used. However, the blower is not limited to the blower as long as the air supply amount and the exhaust amount can be adjusted.

  The internal pressure measuring means 8 in the present invention only needs to be able to measure the pressure in each drying zone, and the external pressure measuring means 9 in the present invention only needs to be able to measure the pressure outside the drying zone. Although not particularly limited, a pressure difference between the pressure inside and outside the drying zone from the pressure inside the drying zone measured by the internal pressure measuring means 8 and the pressure outside the drying zone measured by the external pressure measuring means 9; Since it is preferable to control the differential pressure between the pressures in adjacent drying zones to be in the range of −2 Pa to 2 Pa, a resolution capable of grasping the difference is required.

  As the differential pressure calculation means in the present invention, an analog display such as a Manostar gauge or a digital differential pressure gauge can be used, but is not limited thereto. However, from the pressure inside the drying zone measured by the internal pressure measuring means 8 and the pressure outside the drying zone measured by the external pressure measuring means 9, the differential pressure between the pressure inside and outside the drying zone and the pressure inside the adjacent drying zone Since it is preferable to control the differential pressure within a range of −2 Pa or more and 2 Pa or less, a resolution capable of grasping the difference is required.

  As the control means in the present invention, the amount of air supplied to the drying zone by the air supply means so that the differential pressure calculated by the differential pressure calculation means is in the range of −2 Pa to 2 Pa. Any device can be used as long as it can control the exhaust amount of air exhausted from the inside of the drying zone by the exhaust unit, and is not particularly limited.

  Here, when the base material 10 is carried in from the carry-in port 4 of the drying zone 3a into which the base material 10 is first carried in, outside air enters from the carry-in port 4 into the drying zone, thereby causing unevenness. If the pressure difference between the pressure inside the drying zone and the pressure outside the drying zone is in the range of −2 Pa or more and 2 Pa or less, the wind speed of the outside air entering from the carry-in port 4 can be reduced to an appropriate range, so that unevenness does not occur.

  Moreover, when the base material 10 is carried into the adjacent drying zone, an air flow is generated in the transport direction of the base material 10, thereby causing unevenness. By making the differential pressure between the pressures in the adjacent drying zones in the range of −2 Pa or more and 2 Pa or less, the wind speed of the air current causing the unevenness can be reduced to an appropriate range, and thus unevenness is suppressed. Can do.

  However, the internal pressure measuring means 8 and the external pressure measuring means 9 are used for pressure measurement before the start of coating, and the differential pressure calculating means is configured to calculate the pressure inside the drying zone and the pressure outside the drying zone before starting coating. Used to measure the pressure difference between the two and the pressure difference in the adjacent drying zone. The differential pressure referred to in the present invention refers to the difference between the pressure inside the drying zone before the start of coating and the pressure outside the drying zone, and the difference between the pressures inside the adjacent drying zones. The control means is used for controlling the air supply amount before the start of coating, the exhaust amount, or both.

  During coating, fluctuations in the atmospheric pressure outside the drying apparatus 2 are unavoidable due to entering and leaving the coating chamber. Whenever the change occurs, the control means is used to change the amount of air supplied to the drying zone and the amount of air exhausted from the drying zone. The air current is disturbed and causes unevenness. Therefore, the internal pressure measuring means 8 and the external pressure measuring means 9 are used for static pressure measurement before the start of application, and the internal / external differential pressure calculating means is used for static pressure calculation before the start of application. The control means is used for controlling the static air supply amount before starting and / or the exhaust amount. However, the substrate 10 may be transported or stopped during pressure measurement, differential pressure calculation, and control of the air supply amount and the exhaust amount.

  In order to keep the air supply amount at the air supply port 6 and the exhaust amount at the exhaust port 7 small and to increase the drying speed, it is necessary to restrict the space in which the air flow 17 is generated to some extent. Therefore, the distance between the top plate 13 and the bottom plate 14 (perpendicular to the substrate surface) is preferably in the range of 10 mm to 100 mm. If it is less than 10 mm, it causes a trouble such as contact with the top plate 13 or the bottom plate 14 when the substrate 10 is conveyed, which is not preferable. On the other hand, if it is higher than 100 mm, it is necessary to increase the air supply amount and the exhaust amount in order to increase the drying speed.

The height of the opening 15 of the air supply port (the diameter in the direction perpendicular to the substrate surface) and the height of the opening 16 of the exhaust port (the diameter in the direction perpendicular to the substrate surface) are the top plate 13 and the bottom plate 14. And the distance (perpendicular to the substrate surface). By doing so, an air flow 17 generated between the air supply port 6 and the exhaust port 7 is uniformly generated between the top plate 13 and the bottom plate 14 in the drying zone, and the coating film 11 of the substrate 10 is formed. An air flow 17 is generated on the side opposite to the side on which the coating film 11 of the substrate 10 is formed. Thereby, it becomes difficult to produce a blur in the height which conveys the base material 10, stability is ensured, and nonuniformity generation | occurrence | production can be prevented.
In order to generate the air flow 17 generated between the air supply port 6 and the exhaust port 7 more stably, it is preferable to match the air supply amount at the air supply port 6 with the exhaust amount at the exhaust port 7. .

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 5 m to 100 m is used.
The length of the drying zone in the present invention (base material transport direction) is about 0.3 m to 3.0 m.

  The drying apparatus 2 according to the present invention can maintain the drying speed faster than at least natural drying while suppressing the occurrence of slight drying unevenness, and thus 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 or FIG. 4, the drying apparatus 2 of the present invention is introduced as the first drying apparatus in the first half, and a known drying apparatus is introduced as the second drying apparatus 12 in the second half. Also good.

  As the second drying device 12, a method of applying a jet flow with a raised 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 12 are made independent of 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 apparatus and method for producing a coated product of the present invention can be used for various products, and is particularly effective for coating a dispersion using an organic solvent as a solvent. Among them, it is effective for a product with less tolerance for unevenness, such as an optical film, which has been in increasing demand in recent years.

  Here, the optical film is a film used mainly on or on the outermost surface of a display device such as a liquid crystal or a plasma display, and is a hard coat film, an antireflection film, an antiglare film, an optical compensation film, a light diffusion film. A film etc. are mentioned.

  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 9 used in the present invention, various materials can be used depending on applications. Examples of components constituting the substrate 9 include cellulose films such as acetyl cellulose and triacetyl cellulose, polyester films such as polyethylene terephthalate and polyethylene naphthalate, and acrylic films such as polymethyl methacrylate. It is not limited to these. Moreover, the base material 9 may consist of a single layer, or may consist of multiple layers. In addition, the thickness of the base material 9 is generally 10 to 500 μm.

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 cross-sectional view of the drying apparatus shown in FIG. 1. The plane schematic of the drying apparatus shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Application | coating apparatus 1b Application | coating part 2 Drying apparatus 3a-3h Drying zone 4 Carrying-in inlet 5 of the drying zone to carry in first 5 Carrying-out outlet of the drying zone to carry out last 6 Air supply port 7 Exhaust port 8 Internal pressure measuring means 9 Means 10 Substrate 11 Coating film 12 Second drying device 13 Top plate 14 Bottom plate 15 Air supply opening 16 Exhaust opening 17 Air flow 18 Coating film conveyance 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, a bottom plate, a right side plate, a left side plate, a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film, and the coating film. A drying zone arranged in two or more zones in the transport direction of
An air inlet arranged on either the right side plate or the left side plate of each drying zone;
An air supply means for supplying air into the drying zone through the air supply port;
An exhaust port disposed on either the left side plate or the right side plate of each drying zone facing the air supply port;
Exhaust means for exhausting air from within the drying zone through the exhaust port;
With
The drying zone in which the air supply port is arranged on the right side plate and the drying zone in which the air supply port is arranged on the left side plate are alternately arranged in the transport direction of the coating film. Membrane manufacturing equipment.   The coating film conveyance distance from the coating part of the coating device to the carry-in port of the drying zone that first carries the coating film is in a range of 0.2 m to 0.8 m. Coating film manufacturing equipment. An external pressure measuring means for measuring the pressure outside the drying zone;
An internal pressure measuring means for measuring the pressure in each drying zone;
The pressure difference between the pressure outside the drying zone measured by the external pressure measuring means and the pressure inside the drying zone measured by the internal pressure measuring means, and the pressure in the adjacent drying zone measured by the internal pressure measuring means. Differential pressure calculation means for calculating the differential pressure of the pressure,
An air supply amount of air supplied to each drying zone by the air supply means or an exhaust means so that the differential pressure calculated by the differential pressure calculation means is in a range of −2 Pa to 2 Pa. Control means for controlling the amount of air exhausted from each drying zone, or both;
The apparatus for producing a coated product according to claim 1, wherein:   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, a bottom plate, a right side plate, a left side plate, a carry-in port for carrying in the coating film, and a carry-out port for carrying out the coating film. An even number is arranged in the transport direction,
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, an air supply port arranged on either the right side plate or the left side plate of each drying zone, an air supply means for supplying air into the drying zone through the air supply port, and the air supply port are opposed to each other. An exhaust port disposed on either the left side plate or the right side plate of each drying zone, and an exhaust means for exhausting air from the inside of the drying zone via the exhaust port, the air supply port being disposed on the right side plate A drying step in which the drying zone and the drying zone in which the air supply port is arranged on the left side plate are dried while being conveyed in the drying zone that is alternately arranged in two or more zones in the conveying direction of the coating film;
Next, a step of unloading the coating film from the outlet of the drying zone where the coating film is finally unloaded,
The manufacturing method of the coating material characterized by having.   The coating film conveyance distance from the application part of the said application | coating process to the carrying-in entrance of the drying zone which carries in the said coating film initially is the range of 0.2 m or more and 0.8 m or less. Coating film manufacturing equipment. An external pressure measuring means for measuring the pressure outside the drying zone, an internal pressure measuring means for measuring the pressure inside each drying zone, a pressure outside the drying zone measured by the external pressure measuring means, and the internal pressure measuring means A differential pressure calculating means for calculating a differential pressure between the measured pressure in the drying zone and a differential pressure in the adjacent drying zone measured by the internal pressure measuring means,
The air supply means supplies air into each drying zone so that the differential pressure calculated by the differential pressure calculation means is in the range of −2 Pa to 2 Pa, or the exhaust means The method for producing a coated product according to claim 5 or 6, wherein the exhaust amount of air exhausted from the inside of the zone or both of them is controlled by a control means. An optical film formed using the production method according to claim 5.

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