JP4132943B2 - Positive photosensitive film forming method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate for gravure printing of a positive photosensitive composition having a near-infrared wavelength region laser sensitivity that is sensitive to exposure to a near-infrared wavelength region laser and the sensitive part becomes soluble in a developer. The present invention relates to a method for forming a positive photosensitive film which is applied to a roll without causing whitening and having a residual solvent at a required concentration or less.
[0002]
[Prior art]
As one of the plate making methods for gravure printing rolls, there is a so-called etching method in which a photosensitive film is applied and formed on the copper sulfate plating surface of a plate making roll, an image is printed with a laser, developed, etched, resist stripped and chromium plated. It is done.
In the conventional etching method, a negative photosensitive film is applied to a plate-making roll, and the coating film is dried at room temperature to form a negative photosensitive film, which is baked with an argon ion laser to form a positive photosensitive film. Therefore, no baking is performed with a laser in the near-infrared wavelength region.
[0003]
[Problems to be solved by the invention]
If the beam diameters of the argon ion laser and the laser in the near-infrared wavelength region are the same, the resolution of the laser is higher in the positive type than in the negative type.
A positive image is formed on a photosensitive film of a positive photosensitive composition (for example, JP-A-10-26826, JP-A-10-90881, JP-A-10-161304, JP-A-11-231515) with a laser in the near infrared wavelength region. The pattern is cut better when the negative photosensitive image is printed on the photosensitive film of the negative photosensitive composition with an argon ion laser.
[ 0004 ]
Therefore, with regard to the etching method as one of the plate making methods of the gravure printing roll, a positive type photosensitive composition photosensitive film is applied and formed on the copper sulfate plating surface of the plate making roll, and a positive image is formed with a laser in the near infrared wavelength region. After testing for improvement after baking, developing, etching, stripping resist, and chromium plating, it was found that there were two problems that could not print positive images with a laser in the near infrared wavelength region.
[ 0005 ]
One was that the positive photosensitive composition was applied, the coating film was dried with a drier, developed by laser exposure, and where development was possible or not. When the coating film was dried at various temperatures and developed repeatedly, when the residual solvent was about 4%, a positive image could not be printed with a laser in the near infrared wavelength region, and the residual solvent was about 2% to It was found that a positive image could be printed with a laser in the near-infrared wavelength region when the amount was 3% or less. Therefore, it has been found that it is necessary to perform a burning treatment so that the residual solvent is about 2% to 3% or less.
[ 0006 ]
The other is that when the positive photosensitive composition is applied and the coating film is sufficiently burned so that the residual solvent is about 2% to 3% or less, the development can be done well and the development is quite complete. When it was not possible. As a result of daily experiments, development was successful on sunny days, and development was not possible at all on rainy days.
Examination of the photosensitive film formed on a day when development could not be performed at all revealed that whitening occurred.
[ 0007 ]
The whitening phenomenon is the absorption of moisture when the temperature of the non-crystalline part of the polymer, which is composed of a dense part (crystalline part) and a sparse part (non-crystalline part), falls below the glass transition point Tg. It is a phenomenon that turns white and vitrifies, and is likely to occur in cold air with a high humidity. The positive photosensitive composition applied to the plate-making roll in a constant temperature room at 25 ° C. causes a whitening phenomenon because the solvent contained in the positive photosensitive composition evaporates by removing latent heat from the coating film. This is presumably because the amorphous portion lowers the temperature below the glass transition point Tg and absorbs moisture from condensation.
[ 0008 ]
Therefore, keeping the humidity in the platemaking room below 40% is effective to avoid the whitening phenomenon, but the equipment and running costs of the large dehumidifier are extremely high, and a large dehumidifier installation space is required. Therefore, it is difficult to install in the existing plate making room.
Therefore, another solution that does not install a large-sized dehumidifier is required.
[ 0009 ]
As a result of intensive research, one solution is that when the positive photosensitive composition is applied to a plate-making roll and the evaporation area is maximized, the temperature of the coating film is lowered below the glass transition point due to the latent heat accompanying the evaporation of the solvent. It was considered to prevent the temperature from dropping. Specifically, it has been considered to mix a low boiling point solvent having a low evaporation rate and a small amount of latent heat of vaporization by reducing the proportion of a solvent having a high evaporation rate and a large amount of latent heat of vaporization such as IPA. Further, it was considered that this low boiling point solvent needs to have a property of preventing moisture. Further, it has been considered to use a positive-type photosensitive composition modified by containing a low-boiling point polymer or a low-boiling point plasticizer and reducing the glass transition point.
[ 0010 ]
Therefore, when a positive photosensitive composition mixed with a low boiling point solvent was formulated to form a photosensitive film and developed, good development was achieved. Good development could be achieved even when a modified positive photosensitive composition containing a low-boiling point polymer and containing a low glass transition point was used. Furthermore, even when a modified positive photosensitive composition in which a low-boiling plasticizer was contained in a required proportion to lower the glass transition point was used, good development could be achieved.
[ 0011 ]
A positive photosensitive composition mixed with a low-boiling solvent was formulated, a photosensitive film was formed, and the development test was repeated. The exposure of the photosensitive film on the first plate-making roll was started after one day of coating operation.・ Development was good, but exposure / development gradually worsened after the second one, and it became clear that the second and later ones settled down.
After careful examination, whitening of the photosensitive film on the first plate-making roll at the start of the day's coating operation has not occurred, but whitening has occurred near the end of the coating on the second plate-making roll. In addition, it was found that the width of whitening gradually increased gradually in the third and subsequent plate-making rolls.
[ 0012 ]
The reason for this was considered to be the whitening phenomenon because the burning treatment was necessary and sufficient for all the plate-making rolls.
When the coating operation is restarted after a while after closing the lid of the tank for storing the positive photosensitive composition, the same as the above with the first, second and third plate-making rolls as above. It was found that there was a difference in which whitening phenomenon occurred.
[ 0013 ]
Therefore, when the coating operation is performed by opening the lid of the tank for storing the positive photosensitive composition, the solvent of the positive photosensitive composition adhering to the coating roll takes away latent heat from the coating roll and evaporates. Heat exchange is performed between the lowering application roll and the positive photosensitive composition stored in the tank, and the temperature of the positive photosensitive composition stored in the tank gradually decreases. When the lowered positive photosensitive composition adheres to the surface of the coating roll and is applied to the plate-making roll and the solvent evaporates on the surface of the roll, the temperature of the coating film is lower than the glass transition point Tg. it was thought.
[ 0014 ]
So we tried several solutions. When the positive photosensitive composition was applied with the roll heated to 30 ° C., no whitening phenomenon occurred. Further, when the tank was covered with a heat insulating material and the tank was heated with a heater to keep the temperature of the positive photosensitive composition at 25 ° C., no whitening phenomenon occurred. In both cases, exposure and development were performed satisfactorily.
In consideration of the cold season in winter, it was found that when a roll that was satisfactorily applied with a coating apparatus was taken out and exposed to the cold before performing the burning treatment, a whitening phenomenon occurred.
[ 0015 ]
The present invention has been devised in view of the above points, and is a positive type having a near-infrared wavelength region laser sensitivity that is sensitive to exposure to a near-infrared wavelength region laser and the sensitive part becomes soluble in a developer. The photosensitive composition is applied to a plate-making roll for gravure printing and the coating film is burned. Between the coating process and the coating process and the burning process, the solvent of the positive photosensitive composition is vaporized. Since the temperature of the coating film is not lowered below the glass transition point due to the accompanying latent heat, whitening does not occur even if the large-scale dehumidifier is installed in the plate making room and the humidity is not significantly reduced, and it remains. It is an object of the present invention to provide a positive photosensitive film forming method capable of forming a good positive photosensitive film that can be exposed to light by a laser in the near infrared wavelength region when the solvent is at a required concentration or less.
[ 0016 ]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a gravure positive photosensitive composition having a near-infrared wavelength region laser sensitivity that is sensitive to exposure to a near-infrared wavelength region laser and the sensitive part becomes soluble in a developer. A positive photosensitive film that does not cause whitening is formed by coating with a coating roll that rotates in contact with a printing plate making roll, a non-impact coating roll that rotates while maintaining a certain gap, or a coating means such as a kiss coater. A method comprising: (a) warming a positive photosensitive composition stored in a tank to a required temperature; (b) heating a coating roll to a required temperature with a hot wire; and (e) requiring a plate-making roll. By performing at least one of heating to a temperature, the positive photosensitive composition is uniformly applied to the plate-making roll so that the temperature of the coating film does not drop below the glass transition point. The coating film is burned without lowering the temperature of the coating film below the glass transition point, and the residual solvent is dried to a concentration below the concentration at which the laser in the near-infrared wavelength region can sensitize the positive photosensitive film to exposure. The present invention provides a method for forming a positive type photosensitive film.
[ 0017 ]
In the invention described in claim 2, the positive photosensitive composition is applied to the plate-making roll in a sealed form having an openable / closable door through which the plate-making roll can be taken in and out, and in a casing capable of exhausting combustible gas. Burning of the coating film applied to the plate-making roll is carried out by the equipped coating means, and positive type photosensitivity is provided by a burning heater equipped so as to be close to the plate-making roll attached to the coating means. 2. The positive photosensitive film forming method according to claim 1, which is carried out after the application of the composition is completed and after the explosion-proof conditions are adjusted.
[0018]
According to the third aspect of the present invention, the application of the positive photosensitive composition to the plate-making roll is such that the coating film does not drop below the glass transition point due to the latent heat accompanying the vaporization of the solvent of the positive photosensitive composition. 3. The positive photosensitive film forming method according to claim 1, wherein the process is performed under the condition that the atmosphere of the plate-making roll is maintained at a required temperature and / or the temperature of the plate-making roll is increased. Is to provide.
[ 0019 ]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a plate for gravure printing of a positive photosensitive composition having a near-infrared wavelength region laser sensitivity that is sensitive to exposure to a near-infrared wavelength region laser and the sensitive part becomes soluble in a developer. This is a method for forming a positive photosensitive film which is applied to a roll without causing whitening and having a residual solvent at a required concentration or less.
[ 0020 ]
The present invention is a method in which a positive photosensitive composition is applied to a plate-making roll to burn the coating film. Between the coating process and the coating process and the burning process, the solvent of the positive photosensitive composition is used. In order to prevent the temperature of the coating film from dropping below the glass transition point due to the latent heat accompanying vaporization, the residual solvent is reduced to a required concentration or less so that it can be exposed to light by a laser in the near infrared wavelength region after burning. Thus, a positive type photosensitive film is obtained.
[ 0021 ]
As a method for applying the positive photosensitive composition to the plate-making roll, a known method can be adopted.
Explaining once, the application of the positive photosensitive composition to the plate-making roll is performed by horizontally rotating the plate-making roll on the coating device and chucking the both ends at a low speed, and the lower side of the plate-making roll is placed under the plate-making roll. A coating roll (sponge roll) attached to a tank that rises corresponding to one end and moves to the other end after the required approach is immersed in a positive photosensitive composition stored in the tank and rotated. The positive photosensitive composition is coated by moving the plate-making roll from one end to the other end in an extremely light contact with the plate-making roll.
The coating roll may be applied to the plate making roll by floating proximity control so as to maintain an extremely small gap with respect to the plate making roll by driving an electrostrictive actuator or a voice coil.
[ 0022 ]
The positive photosensitive composition may be prepared by, for example, treating the solvent of the positive photosensitive composition disclosed and sold in JP-A-10-26826, JP-A-10-90881, JP-A-10-161304, and JP-A-11-231515 with moisture. Replacing with a low-boiling solvent having the property of preventing the occurrence of whitening has a great effect on whitening prevention. When propylene glycol monomethyl ether, normal propanol, or the like is used as a low boiling point solvent that replaces IPA, there is an effect that the latent heat of vaporization is reduced, the temperature drop of the coating film is small, and the dew condensation moisture absorption is reduced.
In addition, it is possible to use a positive type photosensitive composition having a high molecular weight and a low boiling point, which is modified with a polymer such as a phenol novolac-modified resin or a plasticizer such as a phthalic acid ester to lower the glass transition point. It has a great effect on prevention.
[ 0023 ]
Burning to heat and dry the coating and coating film is performed in a sealed casing having an openable / closable door that allows the plate-making roll to be taken in and out, and the plate-making roll can be taken in and out between the coating step and the burning step. Preferably it is not done.
For this reason, the side panel or the bottom panel constituting the casing is heated with a hermetic heater to control the temperature, and the atmosphere in the casing is set to a required temperature at which there is no risk of explosion with respect to the solvent in the positive photosensitive composition. A casing that can be controlled is provided, and a roll chuck rotating means, a coating device, and a heating heater are provided in the casing, and when the positive photosensitive composition is applied to the plate-making roll, the solvent of the positive photosensitive composition is removed. It is preferable to maintain the atmosphere of the plate making roll at a required temperature so that the coating film does not drop below the glass transition point due to latent heat accompanying vaporization.
In order to avoid the whitening phenomenon, it is preferable that the plate making roll is preheated to a required temperature, preferably preheated to about 30 ° C. and accommodated in the casing.
[ 0024 ]
It is preferable that two roll chuck rotating means are provided in the casing on the left and right side, and two plate-making rolls can be horizontally chucked at each end and can be rotated at a required low speed. The plate making roll is preheated to a required temperature, for example, 30 ° C., so that the coating film of the positive photosensitive composition does not drop below the glass transition point, and both ends are horizontally moved by an industrial robot. It is preferable that chucking is performed to lower the door at the upper part of the entire panel and accommodate it in the casing through the door opening and chuck it by the roll chuck rotating means.
[ 0025 ]
When two roll chuck rotating means are provided in the left and right arrangement in the casing, the coating apparatus is a common application apparatus for the two plate-making rolls attached in the left and right arrangement in the casing.
One roll chuck rotating means may be provided.
[ 0026 ]
FIG. 1 is a front view of a positive photosensitive film forming apparatus for carrying out the method for forming a positive photosensitive film of the present invention.
[ 0027 ]
The casing 1 has roll entry / exit openings 1a, 1a at the upper part of the entire surface, and has roll entry / exit doors 2 and 2 that close up and close the roll entry / exit openings 1a, 1a. ) And is accommodated in the door pocket wall 1b, allowing the lower side of the door pocket wall 1b to pass through the coating device, and is provided with a lifting door 3 that is lowered when the door is closed and partitions the internal space left and right. The casing 1 is configured such that the gas in the casing is recovered by an exhaust gas recovery device (not shown) through exhaust ducts 4 and 4 provided in communication with the left end and the right end of the upper surface of the casing. Warm air is fed into the door pocket wall 1b from the air supply duct 5 provided so as to communicate with the central portion of the upper surface of the casing, and the warm air in the door pocket wall 1b is a double-wall structure elevator door The heat-resistant mesh material 3a on both sides of 3 is passed through and flows into the left space and right space in the casing, and the flammable gas does not flow between the left space and the right space. To do.
[ 0028 ]
A roll chuck rotating means 6 is provided in each of the left space and right space in the casing 1, and a common coating device 7 runs on the rail 8 so as to reciprocate between the left space and right space in the casing 1. Equipped.
[ 0029 ]
The roll chuck rotating means 6 is driven by a motor (not shown) and rotated by a drive side chuck 6a and a movable table (not shown) according to the roll length. A plate-making roll R having a size of 300 φmm × 2000 mm can be chucked and rotated at a required low speed.
[ 0030 ]
The coating device 7 is equipped with a traveling carriage 7a that reciprocates below the plate-making roll R chucked by the roll chuck rotating means 6, a lifting table 7b equipped on the traveling carriage, and a lifting table. In addition, a tank 7c that is managed so that the liquid level of the positive photosensitive composition becomes constant by an overflow method, and a positive photosensitive composition that is mounted on a traveling carriage is stored and pumped to the tank 7c. Auxiliary tank 7d for replenishing and receiving overflow liquid, and a lid on the upper surface of tank 7c are exposed to slide sideways, and are partially immersed in a positive photosensitive composition stored in tank 7c. The coating roll 7e is rotatable. The positive photosensitive composition stored in the tank 7c is warmed intermittently with a heater 7f that is covered with a heat insulating material (not shown) and inserted inside, and is kept at a constant temperature during standby and application. For example, the temperature is controlled so as to be almost stable at 25 ° C.
[ 0031 ]
The coating roll 7e is lifted by several mm by a spring, and the rotation axis is different in the direction perpendicular to the rotation axis of the plate making roll R in the plane direction. The coating is rotated so as to rotate upward toward the surface, and is positively photosensitive by being brought into contact with the bottom surface of one end of the plate-making roll R which is attached and rotated by the roll chuck rotating means 6 and extremely elastically lightly. Application of the composition is performed. The application roll 7e is heated to about 25 ° C. by irradiating the upper part of the roll with heat rays such as far-infrared rays (not shown) that start radiation when the lid of the tank 7c is opened.
The roll chuck rotating means 6 does not stop the rotation even after the coating device 7 finishes coating, and continues to rotate the plate making roll until the burning is completed.
[ 0032 ]
The heater for burning is equipped so as to cover the upper surface side of the roll in a cylindrical shape corresponding to each of the two plate-making rolls R, R mounted in the casing 1 in the left-right arrangement.
In order to give versatility to the plate-making roll having a size of 100 φmm × 800 mm to 300 φmm × 2000 mm, the burning heater includes a burning heater 9a near the driving side chuck and a burning heater 9b near the movable side chuck, It is divided by. The burning heater 9a near the drive side chuck can be adjusted to approach and separate according to the roll diameter, and the burning heater 9b near the movable side chuck can be adjusted to approach and separate according to the roll diameter and according to the roll length. The movement can be adjusted in the roll length direction.
[ 0033 ]
In the casing 1, the heated gas flows from the air supply duct 5 through the heat-resistant mesh material 3 a on both sides of the elevator door 3 and flows into the left space and the right space in the casing, and is exhausted through the exhaust ducts 4 and 4. Thus, there is no flow of flammable gas between the left side space and the right side space, and the door is applied even if the application is performed on one side of the casing with respect to the lifting door 3 and the burning is performed on the other side. Can fulfill the extremely safe explosion-proof function.
[ 0034 ]
Burning heaters 9a and 9b provided in the left space and right space in the casing 1 defined by the elevator door 3 on the left and right sides move the common applicator 7 to the opposite space, and the elevator door 3 A heated gas (eg, 30 ° C.) that is closed and free of moisture is ventilated from the mesh material 3a of the elevating door 3 to the spaces on both sides, then supplied with electricity to start heat dissipation, and the positive photosensitive composition of the plate-making roll The coating film is heated to the required temperature and dried to form a positive photosensitive film that can be printed with a laser in the near-infrared wavelength region so that the residual solvent is about 2% or less. Yes.
[ 0035 ]
Specifically, the preferable burning temperature is around 130 ° C., and it is found that the residual solvent is about 2% or less when burning at around 130 ° C., and the positive image is formed on the positive photosensitive film with a laser in the near infrared wavelength region of 830 nm. It was found that development could be performed satisfactorily.
[ 0036 ]
Although not shown, after the burning is completed on the plate making roll chucked by the roll chuck rotating means provided in the casing, a cooling air whose humidity is suppressed to, for example, 20% or less is blown onto the plate making roll.
Accordingly, there is an advantage that the plate-making roll on which the photosensitive film is formed can be immediately sent to the development process, and it is possible to omit providing the roll cooling device and its installation space separately.
[ 0037 ]
In the above-described embodiment, the plate-making roll R is chucked in the left and right positions in the same casing, the coating is performed by the common coating device 7, the lifting door 3 is closed, and the heated gas is the heat resistant mesh material of the lifting door 3. Burning is performed after ventilating the space from 3a to both sides to prevent explosion, and in this case, the mobility of the coating device 7 can be increased to nearly 100%. Further, the above-described embodiment has an advantage that a space for performing burning separately can be omitted.
[ 0038 ]
On the other hand, in the case where one plate-making roll is chucked in the casing and coating is performed by the coating apparatus, and burning is not performed by a separate apparatus, the position of the coating apparatus is between the coating process and the burning process. In order to avoid dripping of the coating film by performing a drying step at room temperature, the drying time at room temperature after coating takes longer than the coating time, and the mobility of the coating apparatus is less than 50%. . Further, in this case, there is a possibility that whitening may occur in the transport process for shifting from the coating process to the burning process.
[ 0039 ]
In the present invention, the elevating table 7b is controlled in a floating manner so that the gap between the coating roll 7e and the plate-making roll R is close to a very small constant gap, for example, 60 μm, and moved from one end of the plate-making roll to the other end. You may make it apply | coat a positive photosensitive composition.
[ 0040 ]
When only one roll chuck rotating means 6 is provided in the casing 1, the coating device 7 moves to a standby position on one side in the casing, the lid of the tank 7c is closed, and the door is closed. Seal the applicator at the standby position so that explosion protection can be achieved.
[ 0041 ]
【The invention's effect】
According to the positive photosensitive film forming method of claim 1, a positive having a near-infrared wavelength region laser sensitivity in which the sensitive part becomes soluble in a developer upon exposure to a near-infrared wavelength region laser. Is applied to a plate roll for gravure printing and the coating film is burned, and the solvent of the positive photosensitive composition is vaporized between the coating process and between the coating process and the burning process. The temperature of the coating film is prevented from dropping below the glass transition point due to the latent heat that accompanies, so whitening does not occur even if a large dehumidifier is installed in the platemaking room and the humidity is not significantly reduced. It is possible to form a good positive photosensitive film that can be exposed to light by a laser in the near-infrared wavelength region with the residual solvent being less than the required concentration.
[ 0042 ]
According to the positive photosensitive film forming method of the second aspect, in addition to the effect of the invention of the first aspect, the coating process and the burning process are performed by performing coating and heating to dryness in a single casing. There is no factor that causes a whitening phenomenon in between, and there is no risk of explosion prevention, and a positive photosensitive film can be formed satisfactorily.
[ 0043 ]
According to the positive photosensitive film forming method of the third aspect, in addition to the effect of the invention of the first or second aspect, there is no cause of whitening in the coating process, and the positive photosensitive film is formed. This has the effect of further increasing the probability of forming the film.
[ 0044 ]
Furthermore, according to the positive photosensitive film forming method according to any one of claims 1 to 3, a positive photosensitive film in which no whitening phenomenon occurs can be formed. Therefore, when developing with a developer for a positive photosensitive composition. Excellent development can be realized.
[Brief description of the drawings]
FIG. 1 is a front view of a positive photosensitive film forming apparatus for carrying out a method of forming a positive photosensitive film according to the present invention.
[Explanation of symbols]
R: Plate making roll, 1 ... Casing, 1a ... Opening / unloading for rolls, 1b ... Door pocket wall, 2 ... Door for rolling out / loading, 3 ... Lift door, 3a ... Heat-resistant mesh material, 4, 5 ... Exhaust duct, 6 ... Air supply duct, 6 ... Application device, 6a ... Drive side chuck, 6b ... Tail chuck, 7 ... Application device , 7a ... traveling cart, 7b ... lifting table, 7c ... tank, 7d ... auxiliary tank, 7e ... coating roll, 7f ... heater, 8 ... rail, 9a, 9b ... Heater for burning .

Claims (3)

A positive-type photosensitive composition having a near-infrared wavelength region laser sensitivity, in which the sensitive part becomes soluble in a developer upon exposure to a near-infrared wavelength region laser, for a plate-making roll for gravure printing A method of forming a positive photosensitive film that does not cause whitening by coating by a coating roll that rotates, a non-impact coating roll that rotates while maintaining a certain gap, or a coating means such as a kiss coater,
(A) warming the positive photosensitive composition stored in the tank to a required temperature;
By performing at least one of (b) heating the coating roll to the required temperature with a hot wire and (e) heating the plate-making roll to the required temperature, the temperature of the coating film of the positive photosensitive composition is increased. Apply uniformly to the plate making roll so that the temperature does not drop below the glass transition point, and then the coating film is burned without lowering the temperature of the coating film below the glass transition point so that the residual solvent is near infrared. A method for forming a positive photosensitive film, characterized by drying so that a laser in a wavelength region has a concentration lower than that at which the positive photosensitive film can be exposed to light.   Application of the positive photosensitive composition to the plate-making roll is performed by a coating means provided in a casing that has a door that can be opened and closed and that can open and close the plate-making roll and that can exhaust combustible gas. Burning of the coating film applied to the plate-making roll is performed after the positive photosensitive composition has been applied by the burning heater equipped so as to be close to the plate-making roll attached to the coating means and explosion-proof. 2. The positive photosensitive film forming method according to claim 1, which is carried out after adjusting the conditions.   The positive photosensitive composition is applied to the plate-making roll by setting the atmosphere of the plate-making roll to the required temperature so that the coating film does not drop below the glass transition point due to the latent heat accompanying the vaporization of the solvent of the positive photosensitive composition. The positive photosensitive film forming method according to claim 1, wherein the method is carried out under a condition that the temperature is maintained and / or the temperature of the plate-making roll is increased.

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