JP2001340797A - Coater and method for manufacturing photosensitive material containing organic silver salt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coater excellent in surface properties without causing any nonuniformity when a backroller cleaner for the surface cleaning is used and a method for manufacturing a photosensitive material containing an organic silver salt. SOLUTION: This coater has an extrusion die coater provided with at least one set of at least one coating solution supply port, a manifold connected to the supply port and spreading the solution in the width direction and a slit connected to the manifold and uniformly discharging the solution, a backroller for supporting a substrate to be coated with the solution discharged from the die coater at a coating position and a roller for cleaning the backroller surface. In this case, the tackiness of the roller surface is controlled to 1-4 N.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coating apparatus and a method for producing a photosensitive material containing an organic silver salt.

[0002]

2. Description of the Related Art In applying a coating film on a support, an extrusion die coater is widely used when high precision of film thickness distribution is required. in this case,
The distance between the support and the coating solution ejection position, which is generally called a coater gap, is an important factor that determines the film thickness accuracy. For this reason, it is widely practiced to support the support at the application position with a back roll in order to define the position of the support at the time of application.

[0003] In the case of coating with a back roll, if a foreign material is sandwiched between the support and the back roll, the coating may be thinned at that portion, causing a spot-shaped failure. If the foreign matter is removed while being attached to the support, a spot-shaped failure will occur at only one place. However, when the foreign matter moves on the back roll, a spot-shaped failure point is repeatedly generated every rotation cycle of the back roll.

[0004] It is widely known to provide a back roll cleaning machine to maintain no foreign matter on the back roll surface. Some of them are wiped off with a non-woven fabric or the like, and others are removed by blowing air. In general, foreign substances are removed by bringing a sticky roll into contact with the surface.

When a back roll cleaner is used to remove foreign matter by bringing a back roll into contact with a roll for cleaning the surface of the back roll, the film thickness periodically changes perpendicularly to the coating direction of the obtained coating film. In other words, a so-called unevenness failure may occur. This failure may occur in the rotation cycle of the back roll, in the rotation cycle of the roll for cleaning the back roll surface, or in a smaller cycle. It does not occur when the contact of the roll for cleaning is stopped. There has been a demand for a coating apparatus free from such a step unevenness failure.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coating apparatus and an organic silver salt which have excellent surface properties without step unevenness failure when using a back roll cleaning machine with a roll for cleaning the back roll surface. An object of the present invention is to provide a method for producing a photosensitive material.

[0007]

The object of the present invention is achieved by the following means.

[0008] 1. An extrusion die coater including at least one coating liquid supply port, a manifold connected to the supply port to spread the coating liquid in the width direction, and at least one set of slits connected to the manifold and uniformly discharging the coating liquid; In a coating apparatus having a back roll for supporting a support for applying a liquid discharged from the die coater at a coating position and a cleaning roll for cleaning the surface of the back roll, the adhesiveness of the cleaning roll surface is 1-4
N. A coating apparatus characterized by being N.

[0009] 2. 2. The coating apparatus according to claim 1, wherein an error in the circumferential direction of the adhesiveness of the cleaning roll for cleaning the surface of the back roll is 5% or less.

[0010] 3. An extrusion die coater including at least one coating liquid supply port, a manifold connected to the supply port to spread the coating liquid in the width direction, and at least one set of slits connected to the manifold and uniformly discharging the coating liquid; A back roll for supporting a support for applying the liquid discharged from the die coater at a coating position, and a cleaning roll for cleaning the surface of the back roll, wherein a JIS-A A coating device having a hardness of 3 to 40.

4. 3. The method according to item 3, wherein an error in the circumferential direction of the average value in the width direction of the JIS-A hardness of the cleaning roll surface for cleaning the back roll surface is 5% or less.
The coating device according to the above.

5. An extrusion die coater including at least one coating liquid supply port, a manifold connected to the supply port to spread the coating liquid in the width direction, and at least one set of slits connected to the manifold and uniformly discharging the coating liquid; A back roll for supporting a support for applying the liquid discharged from the die coater at a coating position, and a cleaning roll for cleaning the surface of the back roll; A coating length of 1 mm or more and a pressing pressure of the cleaning roll of 30 N / cm ² or less.

6. An extrusion die coater including at least one coating liquid supply port, a manifold connected to the supply port to spread the coating liquid in the width direction, and at least one set of slits connected to the manifold and uniformly discharging the coating liquid; A coating device having a back roll for supporting a support for applying the liquid discharged from the die coater at a coating position, and a cleaning roll for cleaning the surface of the back roll; The deviation of the distance per 1 m in the width direction from the rotation axis of the cleaning roll for cleaning the roll surface is within ± 10 μm, and the rotation axis of the cleaning roll and the cleaning roll surface for cleaning the back roll surface are different from each other. ± 5 in the circumferential direction
A coating apparatus, wherein the deviation in the width direction of the average value in the width direction is within ± 10 μm.

7. Wherein the cleaning roll for cleaning the back roll surface is a rubber roll.
7. The coating device according to any one of items 6 to 6.

[8] The method according to any one of the above items 1 to 7, wherein at least one coating layer is coated with a photosensitive layer containing an organic silver salt in a mass ratio of 1 to 50% based on the entire coating layer. A method for producing a photosensitive material.

Hereinafter, the present invention will be described in detail. One means of avoiding the problems described above and obtaining a coating film with excellent surface properties without uneven unevenness when using a back roll cleaning machine by roll contact for cleaning the back roll surface is to clean the back roll surface. Adhesiveness of roll for cleaning is 1-4
N. Here, the adhesiveness means that the diameter is 50
cellophane with a width of 50 mm wound on a roll of 1 mm
It is the average value of the force required to rewind one turn when rewinding at a speed of m / min.

If the adhesiveness is higher than 4N, the peeling force when the back roll and the roll for cleaning the surface of the back roll are separated by the rotation of the roll is strong, and the back roll vibrates and the peripheral speed fluctuates, and the coating film becomes uneven. Disturbed irregularly. If the adhesiveness is less than 1N, foreign substances on the back roll cannot be sufficiently removed, and spot-like failures occur. The range of the degree of adhesion is more preferably 1.5 to 3.0 N.

Even when the degree of adhesion of the roll for cleaning the surface of the back roll is 1 to 4 N, a step-like failure may occur. This is because there is an error in the circumferential adhesiveness of the roll for cleaning the surface of the back roll, and this problem can be avoided by setting the circumferential adhesive error to 5% or less. Here, the error in the degree of adhesion in the circumferential direction means that the diameter is 50
When rewinding a 50 mm wide cellophane wound once around a 1 mm roll at a speed of 1 m / min, the degree of adhesion was measured every 5 mm rewind, and this measurement was repeated for the entire width in contact with the back roll. Means the fluctuation in the circumferential direction of the value averaged in the width direction. The error is preferably set to 3% or less.

Another means of obtaining a coating film having excellent surface properties without step unevenness failure when using a back roll cleaning machine by roll contact for cleaning the back roll surface is a roll surface for cleaning the back roll surface. JIS-A hardness of 3 to 40.

Here, the JIS-A hardness is a value measured by a durometer A manufactured by Shore.
It is a value obtained by the hardness test method for vulcanized rubber and thermoplastic rubber described in K-6253.

When the JIS-A hardness of the roll surface for cleaning the back roll surface is smaller than 3, the roll surface is too soft, pressure is concentrated on the end in the width direction of the roll, and the foreign matter removal property at the center deteriorates. In some cases, the roll itself may be deformed or broken. If the JIS-A hardness is 40 or more, the back roll vibrates and the peripheral speed fluctuates due to slight eccentricity and surface unevenness of the roll, and the coating film is disturbed in a stepwise uneven shape. The JIS-A hardness of the roll surface for cleaning the back roll surface is preferably 10 to 30.

Even if the roll surface for cleaning the back roll surface has a JIS-A hardness of 3 to 50, a step-like uneven failure may occur. This is because there is an error in the JIS-A hardness of the roll surface in the circumferential direction of the roll.
The following can be avoided.

Another means for obtaining a coating film having excellent surface properties without unevenness failure when using a back roll cleaning machine by contacting a roll for cleaning the back roll surface is a roll for cleaning the back roll surface. The contact length of the back roll in the circumferential direction is 1 mm or more, and the pressing pressure of the roll for cleaning the back roll surface is 30 N / cm ² or less. In order to remove foreign substances adhering to the surface of the back roll, the length of the back roll in contact with the circumferential direction of the back roll due to deformation of the roll needs to be 1 mm or more. If the pressure applied to the contact surface at this time is larger than 30 N / cm ² , And the peripheral speed fluctuates, and the coating film is disturbed in a stepped shape. The pressing pressure is preferably 20 N / cm ² or less.

The main causes of step unevenness when using the back roll cleaner are that the rolls are eccentric and the pressing against the back rolls is uneven. Therefore, if a roll having higher shape accuracy can be installed with higher accuracy, occurrence of step unevenness can be suppressed. Another means of obtaining a coating film having excellent surface properties without unevenness failure when using a back roll cleaning machine by contacting a roll to clean the surface of the back roll is the width of the rotation axis of the back roll and the width of the rotation axis of the roll. The deviation of the distance per meter in the direction is within ± 10 μm, the deviation of the distance between the roll rotation axis and the roll surface in the circumferential direction is ± 5 μm, and the deviation per meter in the width direction is within ± 10 μm. It is. If any of them starts to exceed these ranges, the back roll vibrates and the peripheral speed fluctuates, and the coating film is disturbed in a stepwise manner. The distance between the rotation axis of the back roll and the rotation axis of the roll for cleaning the surface of the back roll is shifted by 1 m in the width direction, and the rotation axis of the roll for cleaning the surface of the back roll and the surface for cleaning the back roll surface The range of the deviation of the distance per meter in the width direction of the roll surface is preferably within ± 5 μm, and the distance between the rotation axis of the roll for cleaning the back roll surface and the roll surface for cleaning the back roll surface is preferable. The deviation of the distance in the circumferential direction is preferably within ± 3 μm.

Although these means are effective independently, it goes without saying that when more uniformity of the coating film is required, the effect is improved by using them in combination.

The roll used for cleaning the back roll needs to have an adhesive property in order to quickly remove foreign substances adhering to the back roll. The method of imparting tackiness includes giving a fine structure to the roll surface, using a tackifier such as a terpene resin, a rosin resin, a xylene resin, an alkylphenol resin, and a coumarone indene resin on the roll surface, For example. Examples of the adhesive material include a rubber-based resin, an acrylic-based resin, and a silicone-based resin. In the present invention, a rubber-based resin is preferable.

The present invention is effective in any case in which a liquid discharged by an extrusion die coater is formed as a coating film while the support is supported by a back roll. Materials requiring high precision in the uniformity of the coating film include those which are formed into a product by drying the formed coating film, in particular, those relating to image formation, particularly photographic photosensitive materials.
In particular, a photosensitive material having a photosensitive layer containing an organic silver salt having a mass ratio of 1 to 50% with respect to the entire coating layer in at least one coating layer generally has a large sensitivity shift due to a variation in coating thickness. High uniformity of the coating film is required, and since the coating film easily flows due to the thick coating film, a more precise processing method is required.

In the case of continuously transporting the roll while supporting the support, the roll may have a shape having a different outer diameter in the width direction. This has the effect of transport stability to prevent lateral displacement during transport of the support, and the effect of preventing the transported support from breaking.The crown roll, whose outer diameter at the center of the width is larger than that at the end, can be used. Generally, an outer diameter at the center of the width may be smaller than that at the end. In some cases, a roll having grooves formed thereon to prevent the support from slipping on the roll, or a roll having a surface other than metal such as resin may be used.

When forming a coating film while holding the support on the back roll, particularly when applying a coating liquid discharged from an extrusion die coater, the distance between the liquid projecting position of the die coater and the back roll However, since it greatly affects the film thickness distribution of the formed coating film, it is common to use a flat metal roll having a uniform outer diameter in the width direction and a high surface property instead of the deformed roll as described above. It is a target.

Various types of cleaning rolls are used for cleaning the back rolls. Generally, the cleaning rolls are provided with adhesiveness due to the fine structure of the surface. The effect can be improved by contacting a plurality of cleaning rolls with the back roll. In addition, by attaching a cleaning jig of another roll or a wiping mechanism to the cleaning roll itself, it is possible to prevent foreign matter removed from the back roll from adhering to the back roll again and to endure long-term use. used.

From application to drying, the following process generally follows. The support unwound from the main roll is sent to a coater and coated. The support is preferably cleaned on the coated surface, the back surface or both surfaces with a web cleaner immediately before coating. If the coating is performed with the foreign matter adhered to the coating surface, the function of requiring the foreign matter to enter the coating film cannot be obtained, and it may cause a streak failure in the coating.

In the case of forming a relatively thick coating film in which the coating film is likely to flow and a step-like failure is likely to occur, the coating film after coating is prevented from flowing on the support by gravity. For this purpose, it is preferable that the transport direction of the support immediately after the application is closer to horizontal than the direction of gravity. When a die coater and a back roll are present as in the present invention, the coating film immediately after application may be vertical depending on the positional relationship between them, or the coating film may be oriented in the direction of gravity more than that, but thereafter to the next step. The support transport angle is preferably close to horizontal.

Although there are drying methods using infrared rays or microwaves, generally, means for evaporating a solvent from a coating film by uniformly blowing heated and conditioned air to the coating film is often used. Further, the drying step is formed in a box shape in order to efficiently collect the evaporated solvent and control the drying environment. At this time, the number of drying boxes may be one, but by dividing into a plurality of zones, the drying conditions of each zone can be selectively changed. When air is blown on the coating film to dry it, the drying conditions for each zone include a drying temperature, a speed of the blowing air, a distance between the blowing air outlet and the coating film, and a supply amount of fresh air. In supplying air to the drying zone, in addition to air from a slit or the like in order to spray the coating film, another supply port that hardly affects the flow of air to the coating film may be used. In particular, under conditions where step unevenness caused by turbulence of the coating film due to drying air is likely to occur, it is easy to disturb the coating film if the amount of air blown to the coating film is large, so it is necessary to supply sufficient fresh air into the drying box It is important to provide another supply port.

When an organic solvent is used as a solvent for the coating film, it is common practice to monitor the solvent vapor concentration in the drying box. When the drying box is divided into a plurality of zones, monitoring is performed for each zone.

When the support is transported while being supported by the support roll from the back surface in the dryer, the straightness of the support roll is generally 100 μm or less, preferably 50 μm or less.

The coating film is not dried from the coater to the inside of the drying box, and foreign matters adhering to the surface adhere to the coating film. Therefore, it is necessary to keep the peripheral cleanness high.
The degree of cleanliness in the drying box depends on the nature of the product to be produced, but is preferably at most class 1000, preferably at most class 100. In addition, it is necessary to keep the dust source away from the drying box, and in particular, the fan and vibration source for supplying air into the drying box must be isolated from the drying box.

When the amount of the residual solvent in the coating film affects the function of the finished product, it needs to be controlled. Usually, after passing through the drying box, a heat cure zone for applying heat is provided. The drying box and the heat cure zone may be continuously connected in a heated state, or may be cooled to room temperature or once as needed. The transfer of the support in the heat cure zone can be performed by a plurality of rolls, or the support may be floated and transferred by an air float method. Since the heat cure zone usually has a long transport path, it is desirable to provide a drive roll for transporting the support and a web guide system for controlling the transport position of the support before and after.

[0038]

Example 1 <Preparation of Coating Solution for Photosensitive Layer> (Preparation of Silver Halide Emulsion A) 1.3 kg of inert gelatin and 160 ml of 0.1 mol / L potassium bromide were dissolved in 40 L of water, and the temperature was changed to 35. After adjusting the temperature and the pH to 3.0, 39 L of an aqueous solution containing 4.5 kg of silver nitrate and (98
/ 2) with an aqueous solution containing potassium bromide and potassium iodide in a molar ratio of [Ir (NO) Cl ₅ ] 1 per mole of silver.
× 10 ^-6 mole and rhodium chloride salt at 1 × per mole of silver
10 ^-4 mol was added by a controlled double jet method, keeping the pAg at 7.7. Thereafter, 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene was added, the pH was adjusted to 5 with NaOH, the average particle size was 0.06 μm, the variation coefficient of the projected diameter area was 8%, 10
0) Cubic silver iodobromide grains having an area ratio of 87% were obtained. This emulsion was subjected to coagulation sedimentation using a gelatin coagulant and desalting treatment, followed by addition of 4.2 g of phenoxyethanol, pH 5.9, pA
g was adjusted to 7.5 to obtain a silver halide emulsion.

Next, 3 × 10 ^-2 mol of sodium thiosulfate per mol of silver was added to the silver halide emulsion, and 55
The reaction was carried out at 60 ° C. for 60 minutes for chemical sensitization. afterwards,
After the temperature of the silver halide emulsion was lowered to room temperature, a silver halide emulsion A was prepared by adding an antifoggant and the like described below, and chemically sensitized with chloroauric acid and inorganic sulfur.

(Preparation of Na Behenate Solution) 1.4 kg of behenic acid, 0.42 kg of arachidic acid and 0.25 kg of stearic acid were dissolved in 40 L of pure water at 90 ° C. Then, while stirring at high speed, 4.1 L of a 1.5 mol / L sodium hydroxide solution was added. Next, 39 L of concentrated nitric acid was added, followed by cooling to 55 ° C. and stirring for 30 minutes to obtain a sodium behenate solution.

(Preparation of Preform Emulsion of Silver Behenate and Silver Halide Emulsion A) 640 g of the silver halide emulsion A was added to the above-mentioned sodium behenate solution, adjusted to pH 8.1 with sodium hydroxide solution, and adjusted to 1 mol / mol. L of silver nitrate solution (6.2 L) was added, the mixture was stirred for 20 minutes, and ultrafiltration was performed to remove water-soluble salts. The obtained silver behenate was grains having an average grain size of 0.8 μm and a monodispersity of 8%. After the floc of the dispersion was formed, the water was removed, washed with water six times and water was removed, and dried.

(Preparation of photosensitive emulsion) Polyvinyl butyral (average molecular weight: 3000) was added to the obtained preform emulsion.
After slowly adding and mixing 23 kg of a methyl ethyl ketone solution (17% by mass) and 4.5 kg of toluene, 28
Dispersed with MPa.

Using this dispersion, a coating solution for a photosensitive layer having the following composition was prepared. Methyl ethyl ketone 70% by mass Photosensitive emulsion dispersion 22.8% by mass Sensitizing dye-1 0.16% by mass Pyridinium bromide perbromide 0.29% by mass Calcium bromide 0.16% by mass Antifoggant-1 10.11 Mass% 2- (4-chlorobenzoyl) benzoic acid 0.87 mass% 2-mercaptobenzimidazole 1.05 mass% tribromomethylsulfoquinoline 1.62 mass% A-4 2.82 mass%

[0044]

Embedded image

<Preparation of Protective Layer Coating Solution> A protective layer coating solution having the following composition was prepared.

Methyl ethyl ketone 82.7 mass% cellulose acetate 4.61 mass% methanol 11.0 mass% phthalazine 0.50 mass% 4-methylphthalic acid 0.36 mass% tetrachlorophthalic acid 0.30 mass% tetrachlorophthalic acid anhydride 0.34 wt% monodisperse silica matting agent [monodispersion degree of 10%, an average particle size 4μm] 0.14 _{wt% C 9 H 19 -C 6 H} 4 -SO 3 Na 0.020 wt% <coated sample Preparation> The coating liquid was discharged from the upper slit by a die coater having two slits, the protective layer coating liquid from the lower slit, and the photosensitive layer coating liquid from the lower slit. The wet film was coated on a 100 μm PET support supported by a back roll. It was applied at 100 μm. The back roll was a metal roll having an outer diameter of 300 mm and a surface length of 1300 mm and subjected to chrome plating surface treatment, and the application width was 1000 mm.

After this coating film was dried, the number of spot-like failures caused by foreign matters and the step unevenness were evaluated. The number of occurrences of spot-like failures is the number of occurrences per unit area of the support. The evaluation of step unevenness is based on a 10-point evaluation of the intensity of the unevenness. It was completely lost.

Using a roll for back roll cleaning
When there was no spot unevenness, there was no spot-like failure.
The number of occurrence is 0.72 per unit area of the support
/ M ^TwoMet.

<Test 1> Adhesion in Table 1 below, JIS
A rubber roll having a -A hardness was used as a back roll cleaner, and the sample after coating and drying was evaluated. The pressing pressure of the rubber roll against the back roll was 50 N / cm ² . The distance between the rotation axis of the rubber roll and the surface of the rubber roll exceeded 10 μm in the circumferential direction. Table 1 shows the results of the evaluation.

[0050]

[Table 1]

Sample 11 had a degree of adhesion of 2N and was excellent in both the number of spot-shaped failures and the unevenness of the steps. Sample 12 is
The adhesiveness was low and the number of spot-like failures increased greatly. Sample 13 had an excessively high degree of adhesion, and caused a strong unevenness failure. Sample 14 has a rubber roll having a JIS-A hardness of 2
At 0, both the number of spot-shaped failures and the step unevenness were good. In Sample 15, the JIS-A hardness was too low, and the number of spot-shaped failures increased, especially at the center of the width. Sample 1
In Nos. 1 and 14, the number of occurrences of spot-like failures and the step unevenness were good, but in Samples 16 and 17, the step unevenness occurred by increasing the transport speed of the support from 30 m / min to 50 m / min. Began to do. So in sample 18,
When a rubber roll having an adhesion degree of 2N and a JIS-A hardness of 20 was used, good results were obtained with respect to the number of spot-shaped failures and unevenness of the steps.

<Test 2> A rubber roll was used as a back roll cleaner under the conditions of pressing pressure shown in Table 2 below.
The sample after coating and drying was evaluated. Each of the rubber rolls used had a tackiness of 5N and a JIS-A hardness of 50. Further, the deviation of the distance between the rotation axis of the rubber roll and the surface of the rubber roll in the circumferential direction and the deviation per 1 m in the width direction exceeded 10 μm. Table 2 shows the evaluation results.
Shown in

[0053]

[Table 2]

In Sample 21, the contact length between the back roll and the rubber roll was 5 mm, the pressing pressure of the rubber roll against the back roll was 20 N / cm ² , and the number of spot-shaped failures and the step unevenness were good. Sample 22 has a pressing pressure of 15
As low as N / cm ² , the number of spot-shaped failures has increased greatly. The sample 23 has a contact length of 0.5 in the circumferential direction.
mm, the number of spot-like failures has increased. Sample 24 has a high pressing pressure of 50 N / cm ² ,
Step unevenness occurred.

<Test 3> A rubber roll was used as a back roll cleaner under the installation conditions shown in Table 3 below, and the sample after coating and drying was evaluated. Each of the rubber rolls used had a tackiness of 5N and a JIS-A hardness of 50. Pressing pressure of rubber roll against back roll is 50N
/ Cm ² . Table 3 shows the results of the evaluation.

The symbols in the table are as follows. A: 1m in the width direction of the rotation axis of the back roll and rubber roll
B: Deviation of the distance between the rotation axis of the roll and the surface of the rubber roll in the circumferential direction C: Deviation of the distance between the rotation axis of the roll and the surface of the rubber roll per 1 m in the width direction

[0057]

[Table 3]

The sample 31 has the number of spot-shaped faults,
Both step unevenness was good. In the sample 32, the deviation of the distance per 1 m in the width direction of the rotation axis of the back roll and the rubber roll is large, and the step unevenness is deteriorated. In the sample 33, the distance between the rotation axis of the rubber roll and the surface of the rubber roll in the circumferential direction is large, and the step unevenness is deteriorated. In the sample 34, the deviation between the distance between the rotation axis of the rubber roll and the surface of the rubber roll per 1 m in the width direction is large, and the step unevenness is deteriorated.

[0059]

According to the present invention, it is possible to provide a coating apparatus having excellent surface properties without step unevenness failure when using a back roll cleaner with a roll for cleaning the back roll surface, and a method for producing a photosensitive material containing an organic silver salt. it can.

Claims (8)

[Claims] At least one coating liquid supply port, a manifold connected to the supply port and spreading the coating liquid in a width direction,
An extrusion die coater having at least one set of slits connected to the manifold to uniformly discharge the coating liquid, a back roll for supporting a support for coating the liquid discharged from the die coater at a coating position, An applicator having a cleaning roll for cleaning the back roll surface, wherein the cleaning roll surface has an adhesion of 1 to 4N. 2. The coating apparatus according to claim 1, wherein an error in the circumferential direction of the adhesiveness of the cleaning roll for cleaning the surface of the back roll is 5% or less. 3. At least one coating liquid supply port, a manifold connected to the supply port and spreading the coating liquid in a width direction,
An extrusion die coater having at least one set of slits connected to the manifold to uniformly discharge the coating liquid, a back roll for supporting a support for coating the liquid discharged from the die coater at a coating position, In a coating apparatus having a cleaning roll for cleaning the back roll surface, the cleaning roll surface has a JIS-A hardness of 3
A coating device, wherein 4. An error in a circumferential direction of an average value of JIS-A hardness in a width direction of a cleaning roll surface for cleaning a back roll surface in a circumferential direction is 5% or less.
The coating device according to the above. 5. At least one coating liquid supply port, a manifold connected to the supply port and spreading the coating liquid in the width direction,
An extrusion die coater having at least one set of slits connected to the manifold to uniformly discharge the coating liquid, a back roll for supporting a support for coating the liquid discharged from the die coater at a coating position, In a coating apparatus having a cleaning roll for cleaning the surface of the back roll, a circumferential contact length between the cleaning roll and the back roll is 1 mm or more, and a pressing pressure of the cleaning roll is 30 N / cm ² or less. A coating device characterized by the above-mentioned. 6. At least one coating liquid supply port, a manifold connected to the supply port and spreading the coating liquid in a width direction,
An extrusion die coater having at least one set of slits connected to the manifold to uniformly discharge the coating liquid, a back roll for supporting a support for coating the liquid discharged from the die coater at a coating position, In a coating apparatus having a cleaning roll for cleaning the surface of the back roll, a deviation of a distance per 1 m in a width direction between a rotation axis of the back roll and a rotation axis of the cleaning roll for cleaning the surface of the back roll is ±. The deviation of the distance between the rotation axis of the cleaning roll for cleaning the surface of the back roll and the surface of the cleaning roll in the circumferential direction is within ± 10 μm.
m, wherein the deviation of the average value in the width direction in the circumferential direction is within a range of ± 10 μm. 7. The cleaning roll for cleaning the surface of the back roll is a rubber roll.
7. The coating device according to any one of items 6 to 6. 8. Photosensitivity using the coating apparatus according to claim 1 wherein at least one coating layer contains 1 to 50% by weight of an organic silver salt with respect to the entire coating layer. A method for producing a photosensitive material, comprising applying a layer.