JP7606489B2 - Film manufacturing system and film manufacturing method - Google Patents

Description

The present invention relates to a film manufacturing system and a film manufacturing method.

Conventionally, a method for manufacturing a film is known in which a coating liquid is applied onto a substrate and then dried by blowing air toward the coating (see, for example, Patent Document 1).

JP 2021-34139 A

The present invention provides a film manufacturing system and a film manufacturing method that can improve the adhesion of a coating to a substrate.

The present invention [1] is a manufacturing system for manufacturing a film having a substrate and a coating film disposed on one side of the substrate, the system including a coating device that applies a coating liquid to the one side of the substrate to form a coating film on the one side of the substrate, and a drying device that dries the coating film to form the coating film on the one side of the substrate, the drying device having a first drying section that blows air toward the coating film from at least one side of the substrate, and a second drying section that is disposed downstream of the first drying section in the substrate conveying direction, heats the coating film from the one side of the substrate, and heats the substrate from the other side of the substrate more strongly than the coating film.

With this configuration, in the first drying section, air is blown toward the coating film from one side of the substrate, thereby drying the surface of the coating film without drying the inside of the coating film.

Next, in the second drying section, the substrate is heated more strongly than the coating.

This allows the coating film to react with the substrate while drying, resulting in a coating that has reacted with the substrate.

As a result, the adhesion of the coating to the substrate can be improved.

The present invention [2] includes the film manufacturing system of the above [1], in which the first drying section is disposed on the other side of the substrate, has a support roller that supports the substrate, and blows heated air from the one side of the substrate toward the coating film at a first wind speed, and blows heated air from the other side of the substrate toward the substrate at a second wind speed that is equal to or lower than the first wind speed.

With this configuration, in the first drying section, the wind speed of the heated air from the other side of the substrate (second wind speed) is slower than the wind speed of the heated air from one side of the substrate (first wind speed).

As a result, the surface of the coating film can be dried by heated air from one side of the substrate while preventing the temperature of the substrate from rising excessively due to heated air from the other side of the substrate, and preventing the coating film from drying out to the inside.

The present invention [3] includes the film manufacturing system of the above [2], in which the second drying section blows heated air from the one side of the substrate toward the coating film at a third wind speed, and blows heated air from the other side of the substrate toward the substrate at a fourth wind speed faster than the third wind speed.

With this configuration, in the second drying section, the wind speed of the heated air from the other side of the substrate (fourth wind speed) is faster than the wind speed of the heated air from one side of the substrate (third wind speed).

Therefore, the temperature of the substrate can be raised by heated air from the other side of the substrate, causing the coating to react with the substrate while drying the coating to the inside.

This allows a coating to be obtained that reacts with the substrate, improving the adhesion of the coating to the substrate.

The present invention [4] includes the film manufacturing system of the above [3], in which the first wind speed is 15 m/sec or less and the fourth wind speed is 5 m/sec or more.

The present invention [5] includes the film manufacturing system of the above [4], in which the sum of the first wind speed and the second wind speed is 15 m/sec or less, the ratio of the first wind speed to the second wind speed is 1.5 or more, the sum of the third wind speed and the fourth wind speed is 15 m/sec or less, and the ratio of the fourth wind speed to the third wind speed is 1.4 or more.

The present invention [6] includes the film manufacturing system of the above [1], in which the first drying section has a first area and a second area arranged downstream of the first area in the transport direction of the substrate, the second drying section has a third area arranged downstream of the second area in the transport direction of the substrate, and a fourth area arranged downstream of the third area in the transport direction of the substrate, and the temperature of the heated air in the second area is higher than the temperature of the heated air in the first area, and the temperature of the heated air in the fourth area is lower than the temperature of the heated air in the third area.

The present invention [7] includes a method for producing a film using any one of the film production systems [1] to [6] above, the method including a coating step of forming a coating film on the substrate using the coating device, and a drying step of drying the coating film using the drying device.

The film manufacturing system and film manufacturing method of the present invention can improve the adhesion of the coating to the substrate.

FIG. 1 is a cross-sectional view of the film. FIG. 2 is a schematic diagram of a film production system. FIG. 3 is an explanatory diagram for explaining the drying device shown in FIG.

1. Film First, a description will be given of the film F. As shown in FIG.

The substrate S has a sheet shape. The substrate S has one side S1 and the other side S2 in the thickness direction of the substrate S. The substrate S is made of a thermoplastic resin.

Examples of thermoplastic resins include acrylic resins, polyolefin resins, cyclic polyolefin resins, polyester resins, polycarbonate resins, polystyrene resins, polyamide resins, polyimide resins, and acetate resins. Examples of acetate resins include diacetyl cellulose and triacetyl cellulose.

The substrate S may contain additives. Examples of additives include antioxidants, stabilizers, reinforcing materials, UV absorbers, flame retardants, antistatic agents, colorants, fillers, plasticizers, lubricants, and fillers.

The coating C is disposed on one surface S1 of the substrate S. The coating C covers one surface S1 of the substrate S. Functions of the coating C include, for example, anti-glare properties, anti-reflection properties, and scratch resistance.

The coating C contains a resin. Examples of the resin include a thermosetting resin and a thermoplastic resin. Examples of the thermosetting resin include a urethane resin and an epoxy resin. Examples of the thermoplastic resin include an acrylic resin, a urethane acrylic resin, and a polyester resin.

Coating C may contain particles. Examples of the particles include oxides, carbonates, silicates, silicate minerals, and phosphates. Examples of the oxides include silicon oxide (silica), titanium oxide (titania), aluminum oxide (alumina), and zirconium oxide (zirconia). Examples of the carbonates include calcium carbonate. Examples of the silicates include calcium silicate, aluminum silicate, and magnesium silicate. Examples of the silicate minerals include talc and kaolin. Examples of the phosphates include calcium phosphate.

When film F is an antiglare optical film, the "surface roughness" of coating C is, for example, 0.040 or more, preferably 0.050 or more, and, for example, 0.095 or less, preferably 0.080 or less.

2. Film Manufacturing System Next, the film F manufacturing system 1 will be described.

The film F manufacturing system 1 manufactures the film F. As shown in FIG. 2, the film F manufacturing system 1 includes a coating device 2 and a drying device 3.

(1) Coating Apparatus The coating apparatus 2 applies a coating liquid to one surface S1 of the substrate S to form a coating film on the one surface S1 of the substrate S. In other words, the manufacturing method of the film F includes a coating step. Note that the one surface S1 of the substrate S may be subjected to a surface treatment such as a corona treatment or a plasma treatment before the coating step.

The viscosity of the coating liquid is 100 mPa·s or less, preferably 50 mPa·s or less, more preferably 10 mPa·s or less, for example, 1 mPa·s or more. When the viscosity of the coating liquid is equal to or less than the upper limit, the thickness of the film in the width direction can be made uniform when the coating liquid is applied to a thickness of 50 μm or less.

The surface tension of the coating liquid is, for example, 30 mN/m or more, preferably 35 mN/m or more, and, for example, 60 mN/m or less, preferably 55 mN/m or less.

The solids concentration of the coating liquid is adjusted so that the viscosity of the coating liquid is equal to or less than the upper limit value. The solids concentration of the coating liquid is, for example, 10% by mass or more, preferably 20% by mass or more, more preferably 30% by mass or more, more preferably 40% by mass or more, and is, for example, 50% by mass or less, preferably 45% by mass or less.

The coating liquid contains a resin component and a solvent. The coating liquid contains the above-mentioned particles and additives as necessary. The resin component may be the above-mentioned resin or a precursor of the above-mentioned resin.

Specifically, the coating liquid contains a multifunctional oligomer, a multifunctional monomer, a hydroxyl monomer, a photopolymerization initiator, the above-mentioned particles, a surface tension adjuster, and a thickener. The multifunctional oligomer, the multifunctional monomer, and the hydroxyl monomer are resin components (resin precursors), and the photopolymerization initiator, the surface tension adjuster, and the thickener are additives.

A polyfunctional oligomer has multiple ethylenically unsaturated groups. Examples of ethylenically unsaturated groups include acrylic groups, methacrylic groups, and vinyl groups.

The weight average molecular weight of the polyfunctional oligomer is, for example, 300 or more, preferably 400 or more, and, for example, 5000 or less, preferably 3000 or less.

The functional group equivalent of the polyfunctional oligomer is, for example, 1 or more, preferably 2 or more, and, for example, 6 or less, preferably 5 or less.

Examples of polyfunctional oligomers include urethane acrylate and erythritol-based acrylate.

The proportion of the polyfunctional oligomer in the coating liquid is, for example, 20% by mass or more, preferably 30% by mass or more, and, for example, 70% by mass or less, preferably 50% by mass or less.

A polyfunctional monomer has multiple ethylenically unsaturated groups. Examples of ethylenically unsaturated groups include acrylic groups, methacrylic groups, and vinyl groups.

An example of a polyfunctional monomer is a condensation product of pentaerythritol and acrylic acid.

The proportion of the polyfunctional monomer in the coating liquid is, for example, 20% by mass or more, preferably 30% by mass or more, and, for example, 70% by mass or less, preferably 50% by mass or less.

The hydroxyl group monomer has one ethylenically unsaturated group and one hydroxyl group. Examples of hydroxyl group monomers include 4-hydroxybutyl acrylate and 2-hydroxyethyl acrylate.

The photopolymerization initiator radically polymerizes polyfunctional oligomers, polyfunctional monomers, and hydroxyl monomers by ultraviolet irradiation. Examples of photopolymerization initiators include benzophenone-based photopolymerization initiators, phosphine oxide-based photopolymerization initiators, oxime ester-based photopolymerization initiators, and cationic photopolymerization initiators.

The surface tension adjuster adjusts the surface tension of the coating liquid. Examples of surface tension adjusters include cationic surfactants, anionic surfactants, nonionic surfactants, silicone leveling agents, and fluorine leveling agents.

The thickener adjusts the viscosity of the coating liquid. Examples of thickeners include synthetic inorganic polymers, synthetic organic polymers, and natural organic polymers.

(2) Drying Device The drying device 3 dries the coating film on the substrate S. That is, the manufacturing method of the film F includes a drying step. By drying the coating film, a coating film C is formed on the substrate S, and the above-mentioned film F is obtained. Note that the coating film C may be subjected to an ultraviolet curing treatment or a heat curing treatment as necessary.

As shown in FIG. 3, the drying device 3 has a first drying section 31 and a second drying section 32.

(2-1) First Drying Section The first drying section 31 blows heated air at a first wind speed toward the coating film from at least one side of the substrate S. In this way, the first drying section 31 dries the surface of the coating film.

The first wind speed is, for example, 1 m/s or more, preferably 2 m/s or more, and, for example, 20 m/s or less, preferably 15 m/s or less, more preferably 5 m/s or less.

The first drying section 31 preferably heats the substrate S less strongly than the coating film. As a result, the first drying section 31 does not dry the inside of the coating film. In other words, when the substrate S passes through the first drying section 31, the solvent of the coating liquid remains at the interface between the substrate S and the coating film. Note that the first drying section 31 does not have to heat the substrate S. Alternatively, the first drying section 31 may heat the substrate S more strongly than the coating film to the extent that the solvent of the coating liquid remains at the interface between the substrate S and the coating film.

When the substrate S is heated less than the coating, the first drying section 31 blows heated air of the same temperature as the heated air from one side of the substrate S toward the coating from the other side of the substrate S at a second wind speed slower than the first wind speed. In other words, the first drying section 31 blows heated air from the other side of the substrate S toward the substrate S at a second wind speed that is equal to or lower than the first wind speed. In this way, the first drying section 31 heats the substrate S to a degree that does not dry out the inside of the coating. By heating the substrate S in the first drying section 31 before the substrate S enters the second drying section 32, the adhesion between the substrate S and the coating C can be improved.

When the first drying section 31 heats the substrate S less than the coating, for example, it may blow heated air at a lower temperature than the heated air flowing from one side of the substrate S toward the coating from the other side of the substrate S at a second wind speed that is the same as the first wind speed. When the first drying section 31 does not heat the substrate S, it does not blow heated air from the other side of the substrate S toward the substrate S.

The second wind speed is, for example, 0.5 m/s or more, preferably 1 m/s or more, and, for example, 5 m/s or less, preferably 2 m/s or less.

The sum of the first wind speed and the second wind speed is, for example, 2 m/s or more, preferably 3 m/s or more, and, for example, 30 m/s or less, preferably 15 m/s or less, preferably 10 m/s or less.

The ratio of the first wind speed to the second wind speed (first wind speed/second wind speed) is, for example, 0.1 or more, preferably 1.2 or more, more preferably 1.5 or more, and is, for example, 5 or less, preferably 3 or less.

The drying time in the first drying section 31 is, for example, 40 seconds or more, preferably 55 seconds or more, and, for example, 80 seconds or less, preferably 65 seconds or less.

The first drying section 31 has a first area 31A and a second area 31B.

The first area 31A is located at the upstream end of the first drying section 31 in the transport direction of the substrate S.

The temperature of the heated air in the first area 31A (first temperature) is lower than the boiling point of the solvent in the coating liquid. When the boiling point of the solvent in the coating liquid is 110°C, the first temperature is, for example, 45°C or more, preferably 50°C or more, and, for example, less than 80°C, preferably 75°C or less.

The second area 31B is located downstream of the first area 31A in the transport direction of the substrate S. The second area 31B is located between the first area 31A and the second drying section 32 in the transport direction of the substrate S.

The temperature of the heated air in the second area 31B (second temperature) is higher than the first temperature and lower than the boiling point of the solvent in the coating liquid. When the boiling point of the solvent in the coating liquid is 110°C, the second temperature is, for example, 85°C or higher, preferably 90°C or higher, and, for example, 105°C or lower, preferably 100°C or lower.

The first drying section 31 has a plurality of support rollers 311, a plurality of one-side nozzles 312A, 312B, and 312C, and a plurality of other-side nozzles 313A and 313B.

The multiple support rollers 311 are arranged on the other side of the substrate S. The multiple support rollers 311 are arranged at intervals from each other in the transport direction of the substrate S. The multiple support rollers 311 support the substrate S.

The one-side nozzles 312A, 312B, and 312C are arranged on one side of the substrate S. The one-side nozzle 312A is arranged in the first area 31A. The one-side nozzle 312A blows heated air at a first temperature from one side of the substrate S toward the coating film at a first wind speed. The one-side nozzles 312B and 312C are arranged in the second area 31B. The one-side nozzles 312B and 312C blow heated air at a second temperature from one side of the substrate S toward the coating film at a first wind speed.

The other-side nozzles 313A and 313B are arranged on the other side of the substrate S. The other-side nozzles 313A and 313B are arranged in the second area 31B. The other-side nozzles 313A and 313B blow heated air at a second temperature from the other side of the substrate S toward the substrate S at a second wind speed.

The number and arrangement of the multiple support rollers 311, the one-side nozzles 312A, 312B, and 312C, and the other-side nozzles 313A and 313B are not limited.

(2-2) Second drying section The second drying section 32 is disposed downstream of the first drying section 31 in the transport direction of the substrate S. The second drying section 32 heats the coating film from one side of the substrate S. In this way, the second drying section 32 maintains the temperature of the coating film heated in the first drying section 31.

To heat the coating, the second drying section 32 blows heated air from one side of the substrate S toward the coating at a third wind speed.

The third wind speed is, for example, 1 m/s or more, preferably 2 m/s or more, and, for example, 10 m/s or less, preferably 5 m/s or less.

The second drying section 32 heats the substrate S from the other side of the substrate S more strongly than the coating film. This causes the resin component of the coating film to react with the substrate S while evaporating the solvent, drying the coating film.

In order to heat the substrate S more strongly than the coating, the second drying section 32 blows heated air, for example, from the other side of the substrate S toward the substrate S at a fourth wind speed faster than the third wind speed. In this case, the second drying section 32 may blow heated air from the other side of the substrate S toward the substrate S at the same temperature as the heated air from one side of the substrate S toward the coating, or may blow heated air at a higher temperature than the heated air from one side of the substrate S toward the coating. In other words, when blowing heated air from the other side of the substrate S toward the substrate S at a fourth wind speed faster than the third wind speed, the second drying section 32 blows heated air at a temperature equal to or higher than the temperature of the heated air from one side of the substrate S toward the coating.

In order to heat the substrate S more strongly than the coating, the second drying section 32 may blow heated air from the other side of the substrate S toward the substrate S at a fourth wind speed that is the same as the third wind speed, the heated air having a higher temperature than the heated air blown from one side of the substrate S toward the coating.

The fourth wind speed is, for example, 2 m/s or more, preferably 5 m/s or more, and, for example, 10 m/s or less, preferably 7 m/s or less.

The sum of the third wind speed and the fourth wind speed is, for example, 3 m/s or more, preferably 5 m/s or more, and, for example, 15 m/s or less, preferably 12 m/s or less.

The ratio of the fourth wind speed to the third wind speed (fourth wind speed/third wind speed) is, for example, 1.0 or more, preferably 1.1 or more, preferably 1.4 or more, and is, for example, 2 or less, preferably 1.6 or less.

The drying time in the second drying section 32 is, for example, 30 seconds or more, preferably 35 seconds or more, and, for example, 50 seconds or less, preferably 45 seconds or less.

The second drying section 32 has a third area 32A and a fourth area 32B.

The third area 32A is located downstream of the second area 31B in the transport direction of the substrate S. The third area 32A is located between the first drying section 31 and the fourth area 32B in the transport direction of the substrate S.

The temperature of the heated air in the third area 32A (third temperature) is equal to or lower than the boiling point of the solvent in the coating liquid. When the boiling point of the solvent in the coating liquid is 110°C, the third temperature is, for example, 85°C or higher, preferably 90°C or higher, and, for example, 110°C or lower, preferably 105°C or lower.

The fourth area 32B is disposed downstream of the third area 32A in the transport direction of the substrate S. The fourth area 32B is disposed on the opposite side of the first drying section 31 from the third area 32A in the transport direction of the substrate S.

The temperature of the heated air in the fourth area 32B (fourth temperature) is lower than the third temperature and lower than the boiling point of the solvent in the coating liquid. When the boiling point of the solvent in the coating liquid is 110°C, the fourth temperature is, for example, 45°C or more, preferably 50°C or more, and, for example, 75°C or less, preferably 70°C or less.

The second drying section 31 does not have a support roller. The second drying section 31 dries the coating film while floating the substrate S by blowing air from the other side of the substrate S. The second drying section 31 has a plurality of one-side nozzles 321A, 321B, and 321C and a plurality of other-side nozzles 322A, 322B, 322C, and 322D.

The one-side nozzles 321A, 321B, and 321C are arranged on one side of the substrate S. The one-side nozzles 321A and 321B are arranged in the third area 32A. The one-side nozzles 321A and 321B blow heated air at a third temperature from one side of the substrate S toward the coating film at a third wind speed. The one-side nozzle 321C is arranged in the fourth area 32B. The one-side nozzle 321C blows heated air at a fourth temperature from one side of the substrate S toward the coating film at a third wind speed.

The other-side nozzles 322A, 322B, 322C, and 322D are positioned on the other side of the substrate S. The other-side nozzles 322A, 322B, and 322C are positioned within the third area 32A. The other-side nozzles 322A, 322B, and 322C blow heated air at a third temperature from the other side of the substrate S toward the coating film at a fourth wind speed. The other-side nozzle 322D is positioned within the fourth area 32B. The other-side nozzle 322D blows heated air at a fourth temperature from the other side of the substrate S toward the coating film at a fourth wind speed.

The number and arrangement of the nozzles 321A, 321B, and 321C on one side and the nozzles 322A, 322B, 322C, and 322D on the other side are not limited.

4. Effects and Effects (1) As shown in Fig. 3, according to the manufacturing system 1 for the film F, the drying device 3 has a first drying section 31 that blows air toward the coating film from one side of the substrate S, and a second drying section 32 that is disposed downstream of the first drying section 31 in the conveying direction of the substrate S, heats the coating film from one side of the substrate S, and heats the substrate S from the other side of the substrate S more strongly than the coating film.

Therefore, in the first drying section 31, air is blown from one side of the substrate S toward the coating film, thereby drying the surface of the coating film without drying the inside of the coating film.

Next, in the second drying section 32, the substrate S is heated more strongly than the coating film.

This allows the coating film to react with the substrate S while drying, resulting in a coating film C that has reacted with the substrate S.

As a result, the adhesion of the coating C to the substrate S can be improved.

(2) According to the film F manufacturing system 1, in the first drying section 31, the wind speed of the heated air from the other side of the substrate S (second wind speed) is slower than the wind speed of the heated air from one side of the substrate S (first wind speed).

Therefore, the surface of the coating film can be dried by the heated air from one side of the substrate S while preventing the temperature of the substrate S from rising excessively due to the heated air from the other side of the substrate S, thereby preventing the coating film from drying out to the inside.

(3) According to the film F manufacturing system 1, in the second drying section 32, the wind speed of the heated air from the other side of the substrate S (fourth wind speed) is faster than the wind speed of the heated air from one side of the substrate S (third wind speed).

Therefore, the temperature of the substrate S can be raised by heated air from the other side of the substrate S, causing the coating film to react with the substrate S while drying the coating film to the inside.

This allows a coating to be obtained that reacts with the substrate S, improving the adhesion of the coating to the substrate S.

Next, the present invention will be described based on examples and comparative examples. The present invention is not limited to the following examples. In addition, the specific numerical values of the physical properties, parameters, etc. used in the following description can be replaced with the upper limit values (numerical values defined as "less than or equal to") or lower limit values (numerical values defined as "more than or equal to") of the corresponding physical properties, parameters, etc. described in the above "Form for carrying out the invention."

1. Preparation of Coating Fluid The following materials were mixed with toluene to obtain a coating fluid. The solid content of the obtained coating fluid was 42% by mass, and the viscosity was 6 mPa·s.

Multifunctional Oligomer:
NK Oligomer UA-53H-80BK (manufactured by Shin-Nakamura Chemical Co., Ltd.) 50 parts by mass Multifunctional monomer:
Viscoat #300 (Osaka Organic Chemical Industry Co., Ltd.) 50 parts by weight Hydroxyl group monomer:
4-Hydroxybutyl acrylate (Osaka Organic Chemical Industry Co., Ltd.) 20 parts by weight Photopolymerization initiator:
Omnirad 907 (manufactured by IGM Resin) 5 parts by mass Surface tension adjuster GRANDIC PC4100 (manufactured by DIC Corporation) 1 part by mass Silica particles Techpolymer SSX-103DXE (manufactured by Sekisui Chemical Co., Ltd.) 0.5 parts by mass Thickener Sumecton-SAN solution (manufactured by Nitto Denko Corporation) 1.5 parts by mass 2. Production of Film The coating liquid was applied onto one side of a substrate (material: acrylic film) at a substrate conveying speed of 30 m/min, and dried under the drying conditions shown in Table 1 to obtain films of each of the Examples and Comparative Examples having an acrylic urethane resin coating on one side of the substrate.

3. Evaluation (1) Surface Roughness The arithmetic mean roughness of the obtained film was measured using a surface roughness meter (product name: ET4000A, manufactured by Kosaka Laboratory Co., Ltd.). The results are shown in Table 1. If the "surface roughness" is 0.040 or more and 0.095 or less, it is suitable for use as an anti-glare optical film.

(2) Adhesion The adhesion of the coating of the obtained film (adhesion to the substrate) was evaluated using an ultraviolet fade meter U48H (manufactured by Suga Test Co., Ltd.).

In detail, five test pieces were cut out from each of the films of the examples and the comparative examples. A different "removal time" (removal time from the fade meter) was set for each of the five test pieces. The "removal times" were 48 hours, 96 hours, 144 hours, 192 hours, and 240 hours, and each of the five test pieces corresponded to one of the above "removal times."

All test pieces were placed in the fade meter under the conditions below, and when each "removal time" had elapsed, the test piece corresponding to that "removal time" was removed from the fade meter.

A checkerboard pattern was made on the coating surface of the removed test piece at intervals of 1 mm vertically and horizontally using a cutter knife, and No. 31B tape (manufactured by Nitto Denko Corporation) was applied to the coating with the checkerboard cuts. The tape was then peeled off to check whether the coating with the checkerboard cuts had peeled off.

For each Example and Comparative Example, the "removal time" of the test piece from which the coating first peeled off is shown as adhesion in Table 1. The longer the "removal time" until the coating peeled off, the better the adhesion.
(Fade meter conditions)
Temperature in layer: 40°C
Intralayer humidity: 20%RH
Lamp: (wavelength) 300nm to 700nm, (illuminance) 500W/ ^m2

REFERENCE SIGNS LIST 1 Film manufacturing system 2 Coating device 3 Drying device 31 First drying section 31A First area 31B Second area 32 Second drying section 32A Third area 32B Fourth area 311 Support roller S Substrate C Coating

Claims (7)

A manufacturing system for manufacturing a film having a substrate and a coating disposed on one side of the substrate, comprising:
a coating device that applies a coating liquid to the one surface of the substrate to form a coating film on the one surface of the substrate;
a drying device for drying the coating film to form the coating film on the one surface of the substrate,
The drying device includes:
A first drying section that blows air toward the coating film from at least one side of the substrate;
a second drying section that is arranged downstream of the first drying section in the transport direction of the substrate, and that heats the coating film from the one side of the substrate and heats the substrate from the other side of the substrate more strongly than the coating film. The first drying section is
a support roller disposed on the other side of the substrate and supporting the substrate;
2. The film manufacturing system of claim 1, wherein heated air is blown from the one side of the substrate toward the coating film at a first wind speed, and heated air is blown from the other side of the substrate toward the substrate at a second wind speed that is equal to or lower than the first wind speed. The second drying section is
3. The film manufacturing system of claim 2, wherein heated air is blown from the one side of the substrate toward the coating film at a third wind speed, and heated air is blown from the other side of the substrate toward the substrate at a fourth wind speed faster than the third wind speed. The first wind speed is 15 m/sec or less,
The film manufacturing system according to claim 3 , wherein the fourth wind speed is 5 m/sec or more. The sum of the first wind speed and the second wind speed is 15 m/sec or less,
A ratio of the first wind speed to the second wind speed is 1.5 or more,
The sum of the third wind speed and the fourth wind speed is 15 m/sec or less,
The film manufacturing system according to claim 4 , wherein a ratio of the fourth wind speed to the third wind speed is 1.4 or greater. the first drying section has a first area and a second area disposed downstream of the first area in a transport direction of the base material,
the second drying section has a third area disposed downstream of the second area in the transport direction of the base material, and a fourth area disposed downstream of the third area in the transport direction of the base material,
The temperature of the heated air in the second area is higher than the temperature of the heated air in the first area,
The film manufacturing system according to claim 1 , wherein the temperature of the heated air in the fourth area is lower than the temperature of the heated air in the third area. A method for producing a film using the film production system according to any one of claims 1 to 6, comprising the steps of:
a coating step of forming the coating film on the substrate using the coating device;
and drying the coating film using the drying device.