Coating device and coating film forming method

Abstract

The object is to provide a coating device and a coating film forming method that can shorten the processing time and improve productivity when applying a high-viscosity coating to the circumference of a cylindrical substrate and blowing air to flatten the coating film, and is less likely to cause uneven coating and coating stripes, thereby improving the quality of the formed coating film. In order to achieve this object, a coating device is provided, which has at least one coating unit for applying the coating to the circumference of a cylindrical substrate, at least one rotation drive unit for rotating the cylindrical substrate with the axis of the cylinder as the central axis, at least one airflow injection unit for injecting airflow to a part of the circumference of the cylindrical substrate, and at least one moving unit that enables the airflow injection unit to move in a manner of injecting airflow to the circumference of the coating, wherein the airflow injection unit has a plurality of airflow injection units, and the airflow is injected to the entire circumference of the coating through the plurality of airflow injection units, the moving unit, and the driving unit.

Description

Technical Field

[0001] The present invention relates to a coating device for coating a peripheral surface of a cylindrical substrate and a coating film forming method. Background Art

[0002] In the fields of printing plates used in flexographic printing, gravure printing, etc., photoreceptors used in electrophotographic image forming apparatuses, and belt manufacturing, a coating film is formed on the peripheral surface of a cylindrical substrate, and various methods have been proposed for forming the coating film.

[0003] Methods for applying a coating to the circumference of a cylindrical substrate include, for example, dip coating in which the substrate is immersed in a liquid tank and then lifted up, spiral coating in which the coating is performed spirally on the circumference of the substrate, and spray coating in which droplets are blown onto the circumference of the substrate.

[0004] Among them, spiral coating as shown in Patent Document 1 is a method in which a cylindrical substrate is rotated about an axis, a coating is ejected from a coating nozzle while a coating nozzle is relatively moved in an axial direction, and the coating is applied to the circumference of the cylindrical substrate in a spiral shape, thereby forming a coating film. Spiral coating has advantages such as high utilization efficiency of the coating liquid, ability to apply even high-viscosity coatings, and ability to dry and solidify while rotating.

[0005] On the other hand, spiral coating easily generates spiral coating streaks. As a method for solving this problem, Patent Document 2 discloses a method for flattening the coating film by blowing air immediately after the coating is attached to the peripheral surface of a cylindrical substrate.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 02-273576

[0009] Patent Document 2: Japanese Patent Application Publication No. 2006-055778 Summary of the invention

[0010] Problems to be solved by the invention

[0011] However, there is the following problem in the prior art. In the method of flattening the coating film by jetting air toward the coating, the flattening treatment time is sometimes prolonged. For example, in the case of flattening the entire surface of the coating film on the circumferential surface of a cylindrical substrate using an air jet unit, there is a problem that the longer the distance that the air jet unit should move, the longer the time (flattening treatment time) required for one air jet unit to scan the entire surface of the cylindrical substrate. In particular, under the condition that a lot of energy is required for flattening of high-viscosity coating film formation, thin film formation, etc., the moving speed of the air jet unit also becomes low, so the flattening treatment time will be further prolonged.

[0012] In contrast, Patent Document 2 proposes a slit-type air nozzle and a block-type air nozzle incorporating a plurality of air nozzles, which can simultaneously blow air in the entire axial direction. However, in both cases, the nozzle position is fixed relative to the axial direction during the flattening process, and unlike the flattening process performed by moving one air nozzle, there is no axial nozzle movement, so the force for moving the coating in the axial direction during the flattening process is weak. Therefore, under the conditions of high-viscosity coating and thin-film coating, sufficient flattening cannot be performed.

[0013] In view of the above problems, the present invention aims to provide a coating device and a coating method that can shorten the processing time and improve productivity when applying a high-viscosity coating to the circumferential surface of a cylindrical substrate and blowing air to flatten the coating film, and can also perform sufficient flattening treatment under the coating conditions of high-viscosity coating and thin film method to form a high-quality coating film.

[0014] Means for solving problems

[0015] In order to solve the above problems, the coating device of the present invention has the following structure. That is,

[0016] (1) A coating device comprising at least one coating unit for coating a coating on a circumferential surface of a cylindrical substrate, at least one rotational drive unit for rotating the cylindrical substrate about the axis of the cylinder, at least one airflow injection unit for injecting an airflow onto a portion of the circumferential surface of the cylindrical substrate, and at least one moving unit for enabling the airflow injection unit to move in a manner of injecting an airflow onto the circumferential surface to which the coating is applied, wherein the airflow injection unit comprises a plurality of airflow injection units, and the airflow is injected onto the entire circumferential surface to which the coating is applied by means of the plurality of airflow injection units, the moving unit, and the drive unit.

[0017] (2) According to the coating device described in (1), the coating unit includes a moving unit that moves the ejection hole of the coating in a direction different from the direction in which the peripheral surface of the substrate is rotated by the rotating drive unit, and the coating is applied by moving the moving unit, and the movement of the ejection hole realized by the moving unit of the coating unit and the movement of the airflow injection unit realized by the moving unit that moves the airflow injection unit can be independently controlled.

[0018] (3) According to the coating device described in (1) or (2), the multiple airflow injection units are arranged at a certain interval in a direction parallel to the rotation axis of the cylindrical substrate, and each airflow injection unit maintains a certain gap with the peripheral surface of the cylindrical substrate in the radial direction.

[0019] (4) The coating device according to any one of (1) to (3), wherein the airflow jetting means further includes means for controlling the pressure of the jetted airflow or the distance between the jetting portion of the airflow and the peripheral surface to which the coating material is applied.

[0020] (5) The coating device according to any one of (1) to (4), wherein the moving unit that enables the airflow jetting unit to move further includes a unit for controlling a moving distance and / or a moving speed of the airflow jetting unit.

[0021] (6) According to the coating device described in any one of (1) to (5), the unit for controlling the pressure of the injected airflow has a determiner that determines the starting point and / or ending point of the movement in conjunction with the moving part of the airflow injection unit, and a controller that stores information on the movement amount of the input moving part and the pressure of the airflow and executes a predetermined scanning program.

[0022] (7) A coating film forming method, characterized in that, in the coating film forming method, a cylindrical substrate is rotated with the axis of the cylinder as the central axis, and a coating is ejected from a coating ejection hole that moves linearly in the axial direction toward the circumferential surface of the cylindrical substrate to form a coating film, and then the following steps are included: while the cylindrical substrate is rotated at a speed different from the rotation speed during coating, a plurality of airflow ejection units are used to eject airflow toward a portion of the circumferential surface of the cylindrical substrate, and the airflow is ejected while the plurality of airflow ejection units are moved linearly in the axial direction of the cylindrical substrate. In the step of ejecting airflow, the plurality of airflow ejection units are arranged at a certain interval in the axial direction, and the plurality of airflow ejection units eject airflow simultaneously while moving linearly in the axial direction at the same speed, so as to eject airflow toward the entire circumferential surface of the coating.

[0023] (8) The coating forming method according to (7) is characterized in that the multiple airflow injection units are air nozzles that inject airflow from injection holes, and the multiple airflow injection units move in the axial direction at a certain moving speed while injecting airflow with a certain supply pressure or a certain flow rate, and before the movement stops, the air supply pressure or flow rate is continuously reduced from a certain supply pressure or a certain flow rate.

[0024] (9) The coating forming method according to (7) is characterized in that the multiple airflow injection units are air nozzles that inject airflow from injection holes, and the multiple airflow injection units move in the axial direction at a certain moving speed while injecting airflow with a certain supply pressure, and before the movement stops, the moving speed is continuously increased from the certain moving speed.

[0025] (10) A method for producing a waterless planographic printing plate precursor, characterized in that a coating film composed of a silicone material is formed on the peripheral surface of a cylindrical substrate using the coating film forming method described in any one of (7) to (9).

[0026] Effects of the Invention

[0027] By using the coating device and the coating film forming method of the present invention, even under coating conditions such as coating of a high-viscosity coating liquid or coating of a thin film on the circumferential surface of a cylindrical substrate, it is possible to perform a flattening treatment on the film surface in a short time, and a coating film can be formed on the entire circumference of the cylindrical substrate with high productivity. Furthermore, the coating unevenness can be flattened in the axial direction, and it is not easy to produce residual coating unevenness after the flattening treatment, etc., and a good-quality coating film can be formed over the entire width. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a perspective schematic diagram showing one embodiment of the coating device according to the present invention.

[0029] Figure 2 This is a schematic front view showing one embodiment of a coating device according to the present invention.

[0030] Figure 3 It is a schematic plan view showing one embodiment of the coating device according to the present invention.

[0031] Figure 4 It is a side schematic diagram which shows one embodiment of the coating device which concerns on this invention.

[0032] Figure 5 It is a schematic diagram of a coating film cross section showing the morphology of coating streaks.

[0033] Figure 6 This is a schematic diagram illustrating one embodiment of a coating film flattening method.

[0034] Figure 7 1 is a relationship diagram showing one embodiment of (a) the relationship between the supply pressure and the moving distance of the airflow ejecting unit and (b) the relationship between the moving speed and the moving distance of the airflow ejecting unit in the flattening operation.

[0035] Figure 8 It is a schematic diagram showing the measurement results of the change in the film thickness shape during the flattening operation. DETAILED DESCRIPTION

[0036] Hereinafter, with reference to one embodiment of the present invention, Figure 1 The present invention will be understood through the following description and drawings, but the embodiments of the present invention are not limited to these.

[0037] <Configuration of coating device>

[0038] Figure 1 This is a schematic diagram showing an example of a coating device. Figure 1 (a) mainly shows the structure when coating is performed, Figure 1 (b) mainly shows the configuration when the coating film is flattened by jetting an air flow. Figure 2 , Figure 3 and Figure 4 They are shown in detail Figure 1 1 and 2 (a) are a front view, a top view, and a right side view of the coating device 100 during the coating operation. Figure 1 The coating device 100 shown is as follows Figure 1 As shown in (a), the cylindrical substrate 111 to be coated is rotated around the axis center while the coating ejection nozzle 121 is moved in the axial direction of the cylindrical substrate 111, and the coating F is applied to the outer peripheral surface of the substrate. Figure 1 As shown in (b), the cylindrical substrate 111 is rotated around the axis while the airflow is sprayed toward the coating material F on the outer peripheral surface of the substrate. The coating material is flattened by moving a plurality of airflow spraying units arranged at a certain interval in the axial direction of the cylindrical substrate 111.

[0039] exist Figure 1 In the figure, one airflow injection unit is represented by one airflow injection part 141. For example, a hole for injecting airflow is provided at the top of the airflow injection part 141, and the airflow can be injected toward a part of the circumference of the cylindrical substrate. The airflow injection hole can be circular or slit-shaped. Figure 1 In the figure, only the airflow jet part 141 at the end is given a reference numeral as one airflow jet unit, but the nozzle-shaped part protruding from the airflow jet head 142 is a plurality of airflow jet parts 141, that is, there are a plurality of airflow jet units. Figure 1In (b), the plurality of airflow ejection parts 141 can be moved in the axial direction by using a moving unit of the airflow ejection unit. The moving unit of the airflow ejection unit is connected to a stage 151, a slider 152, and an actuator 153 as a moving mechanism.

[0040] When forming a coating film, if you want the airflow to spray the entire surface of the circumference, the area that one airflow jet unit is responsible for is small, and the airflow is sprayed evenly from multiple airflow jet units to spray the airflow to the entire area of ​​the circumference of the coating. Regarding the flattening treatment time, the target time (minutes) can be calculated by dividing the moving distance S (m) of one airflow jet unit in the length L (m) of the cylindrical substrate by the moving speed (m / minute). That is, it is an example of a coating device having multiple movable airflow jet units and spraying airflow to the entire area of ​​the circumference of the cylindrical substrate coated with the coating. It is a device having the function of flattening the coating film by making multiple airflow jet units move simultaneously in a direction parallel to the axis of the pivot of the cylindrical substrate while making the air etc. collide with the coating applied on the circumference. Flattening is also called leveling.

[0041] The coating device 100 of the present invention comprises Figure 3 The rotary drive unit 110 shown in the figure rotates the cylindrical substrate 111. Figure 4 The coating unit shown here discharges the paint. Figure 2 and Figure 3 The moving unit of the coating unit shown in the figure moves the coating unit in the longitudinal direction of the substrate (Y direction in the figure), Figure 3 and Figure 4 The airflow injection unit shown is used to inject airflow toward a portion of the circumference of the cylindrical substrate 111, and Figure 3 and Figure 4 The moving unit of the airflow ejecting unit shown enables the airflow ejecting unit to move. The cylindrical substrate 111 is a substrate having a cylindrical outer shape, and also includes a hollow cylindrical substrate.

[0042] Hereinafter, the rotation driving unit, the coating unit, the moving unit of the coating unit, the air flow injection unit, and the moving unit of the air flow injection unit will be described in detail.

[0043] <Rotation drive unit>

[0044] Figure 2 and Figure 3The rotation drive unit 110 shown has left and right rotation center axes 112 and 113 for rotationally supporting a cylindrical substrate 111, support tables 114 and 115 for supporting the rotation center axes, an actuator 116 connected to the rotation support axes and driving the cylindrical substrate 111 to rotate, and a rotation speed controller 117 for controlling the actuator and controlling the rotation speed of the cylindrical substrate 111. The rotation drive unit can rotate the cylindrical substrate 111 at an arbitrary rotation speed, and the rotation speed of the cylindrical substrate 111 can obtain a rotation speed suitable for coating and a rotation speed suitable for flattening the coating film by the airflow injection unit. The rotation drive unit is preferably combined with a unit for moving the ejection hole of the coating material, a moving unit for moving a plurality of airflow injection units, that is, Figure 1 The arrows in (reference numeral P) are controlled independently.

[0045] <Coating unit and its moving unit>

[0046] Figure 4 The coating unit shown in the figure includes a discharge nozzle 121 for discharging the coating material from the discharge hole, a coating head 122 for supplying the coating material, a metering pump 123, and a coating tank 124 for storing the coating material. The coating liquid can be continuously discharged from the discharge hole of the discharge nozzle 121 in an arbitrary discharge amount through the flow path (not shown) in the coating head 122 from the coating tank 124. Here, the coating material is discharged by the discharge nozzle 121 in any manner, and can be in the form of droplets or curtains, but preferably in the form of a liquid column.

[0047] Figure 2 and Figure 3 The moving unit of the coating unit shown in the figure is provided with a stage 131 supporting a coating head 122, a slider 132 for moving the stage, an actuator 133 for driving the slider, and a controller 134 for controlling the actuator, so that the coating head 122 can be moved at an arbitrary speed relative to the axial direction of the cylindrical substrate 111. The length direction is a direction parallel to the central axis of the cylindrical substrate. The stage 131 is provided with an adjustment mechanism for adjusting the distance between the ejection nozzle 121 in the coating head 122 and the cylindrical substrate 111. In the case where the coating head 122 is provided with a plurality of ejection nozzles 121, the adjustment mechanism can also be provided for each ejection nozzle.

[0048] The coating unit preferably includes a moving unit that moves the coating ejection hole in a direction different from the direction in which the peripheral surface of the substrate is rotated by the rotation drive unit. Furthermore, the coating is preferably applied to the peripheral surface of the cylindrical substrate by moving the moving unit, and the coating is applied in a spiral shape, and the coating F is arranged on the peripheral surface. In this case, the coating F becomes Figure 5 The morphology of the coating film having an uncoated portion as shown in (a) or Figure 5 (b) shows the morphology of the coating film having projections and depressions.

[0049] <Airflow injection unit and its moving unit>

[0050] Figure 4 This is a schematic diagram when the cylindrical substrate is viewed from the side. Figure 4 The air flow injection unit shown is representatively shown by the air flow injection portion 141. One air flow injection unit has at least one air flow injection portion 141, and a plurality of air flow injection units are arranged in parallel in the axial direction of the cylindrical substrate.

[0051] Preferably, the plurality of airflow injection portions, ie, airflow injection units, are arranged at regular intervals in a direction parallel to the pivot axis of the cylindrical substrate, and each airflow injection unit maintains a regular gap with the peripheral surface of the cylindrical substrate in a radial direction.

[0052] That is, a plurality of airflow injection units such as Figure 3 As shown, it includes an airflow injection portion 141 for injecting multiple airflows at certain intervals in the length direction of the cylindrical substrate 111, an airflow injection head 142 for supplying gas to the airflow injection portion 141, a pressure control unit 143 for controlling the pressure of the gas supplied to the airflow injection head, and a compressed gas supply source 144 for supplying compressed gas to the pressure control unit, and can continuously inject gas G toward the outer peripheral surface of the cylindrical substrate 111.

[0053] exist Figure 3 In the figure, the airflow injection unit is represented by an airflow injection part 141, and there are multiple airflow injection parts 141, which are arranged on the airflow injection head 142. The airflow injection part 141 is fixed by bolts at positions uniformly discrete in the axial direction relative to the airflow injection head 142, and the installation position can be adjusted by changing the fixing part. The airflow injection part 141 has an injection hole for injecting airflow, and it becomes a structure that blows the airflow to the paint F on the peripheral surface through the injection hole toward the surface direction of the cylindrical substrate.

[0054] In addition, Figure 3 In the figure, the airflow injection section 141 is an independent nozzle having its own gas supply port, and is integrally formed by being fixed to the airflow injection head 142. However, the distribution pipe having a manifold may be made into the airflow injection head 142, and a plurality of airflow injection holes leading to the manifold may be provided in the airflow injection head 142, and the airflow injection holes may be used as a substitute for the airflow injection section 141. With regard to the airflow injection unit, the airflow is injected from the airflow injection section 141 toward a portion of the peripheral surface coated with the paint. The airflow injection section 141 includes a plurality of airflow injection units, and the plurality of airflow injection units, a moving unit, and a driving unit thereof are used to inject the airflow toward the entire peripheral surface coated with the paint. There is no limitation on the structure of the airflow injection section 141, but the cross-sectional shape may be circular, slit-shaped, or the like. In addition, with regard to the pressure value controlled by the pressure control unit 143, it may also be the same as Figure 3 The moving unit of the airflow injection unit shown is linked to control the pressure value corresponding to the moving position. Figure 2 The airflow ejection unit and the moving unit thereof are not shown in the figure, but the airflow ejection unit and the moving unit thereof exist on the inner side of the cylindrical substrate 111 .

[0055] In the present invention, the so-called "the airflow injection unit has a plurality of units" may be an airflow injection unit and a moving unit integrated, or may be operated separately. In addition, with respect to the moving unit, a plurality of airflow injection units may be integrated and operated by a single moving unit. Moreover, as described above, the airflow injection unit is represented by an airflow injection portion having an injection hole for injecting airflow, and if there are multiple locations for injecting airflow, it is regarded as a plurality of airflow injection units.

[0056] exist Figure 3 , an example of a moving mechanism of the airflow jet unit 141 is shown. The moving unit of the airflow jet unit includes a stage 151 supporting the airflow jet head 142, a slider 152 that moves the stage, an actuator 153 that drives the slider, and a control device 154 that controls the actuator, and can move the airflow jet head 142 at an arbitrary speed in the length direction of the cylindrical substrate 111. Regarding the moving speed at this time, it is also possible to control the moving speed to change according to the moving position. In addition, the stage 151 has a mechanism for adjusting the distance between the airflow jet head 142 and the cylindrical substrate 111 and the distance between the airflow jet head 142 and the cylindrical substrate 111.

[0057] Here, the plurality of airflow injection holes of the plurality of airflow injection parts 141 preferably maintain a certain gap in the radial direction with the circumferential surface of the cylindrical substrate 111. This is to stably control the airflow from the plurality of airflow injection holes. Maintaining a certain gap in the radial direction with the circumferential surface of the cylindrical substrate means that when the cylindrical substrate rotates, the radial distance between the surface of the circumferential surface of the cylindrical substrate and the injection holes of the plurality of airflow injection units is maintained at the same distance throughout the entire circumference. If the plurality of airflow injection units maintain the same distance, for example, before the axial movement stops, the plurality of airflow injection units can be arranged to move relative to the radial direction while maintaining a state parallel to the rotation axis of the substrate.

[0058] In addition, the airflow injection head 142 and the moving unit of the airflow injection unit may be one or more. In the case of a moving unit with multiple airflow injection units, each moving unit preferably operates in conjunction. From this point of view, the moving unit of the airflow injection unit is preferably one.

[0059] Furthermore, the moving direction of the airflow ejection head 142 may be different from the axial direction of the cylindrical substrate 111 as long as the airflow is ejected to the entire circumference of the cylindrical substrate. In the figure, the airflow ejection parts 141 are arranged in one row, but may be arranged in multiple rows.

[0060] As the gas G, inert gas such as dry air or nitrogen can be used.

[0061] In the coating device of the present invention, it is further preferred that the unit for controlling the pressure of the injected airflow has a determiner that determines the starting point and / or ending point of the movement in conjunction with the moving unit of the airflow injection unit, and a controller that stores information on the movement amount of the moving unit and the pressure of the airflow and executes a predetermined scanning program. Preferably, with respect to the area where one airflow injection unit performs a flattening treatment on the coating film, the starting point and ending point of the movement of other airflow injection units adjacent in the moving direction are determined, and the information on the movement amount of the moving unit and the pressure of the airflow are input in such a way that the flattening treatment on the coating film is performed in the entire area, and a predetermined scanning is performed. By the above, an airflow injection unit for injecting airflow onto a portion of the circumference of a cylindrical substrate is provided, and the airflow is stably injected onto the entire circumference of the coating by a plurality of airflow injection units and their moving units and a rotation drive unit, thereby being able to perform a flattening treatment on the film surface in a short time, and being able to form a coating film on the entire circumference of the cylindrical substrate with high productivity.

[0062] Moreover, the coating device of the present invention may also be provided with a mechanism for adjusting the temperature of the substrate and the coating unit or the airflow injection unit, etc., from the viewpoint of stabilizing the formation of the coating film. In addition, it may also be provided with a coating film thickness measuring device for monitoring the flattening of the coating film, and an inspection machine for inspecting the thickness of the coating film.

[0063] <About coating method and planarization treatment>

[0064] By performing a coating method of a coating material and a coating film flattening process using the coating device 100 having the above-described configuration, a flat coating film can be formed on the entire circumference of the cylindrical substrate 111 in a short time.

[0065] First, the coating method is described. Figure 4 The paint tank 124 shown is filled with paint to fill the dosing pump 123, the coating head 122, the discharge nozzle 121 and the pipes connecting the components. In the coating operation process, after the cylindrical substrate 111 is fixed to the rotating support shafts 112 and 113, Figures 1 to 4In the coating device 100 shown, the coating head 122 that discharges the coating material is moved in the axial direction of the cylindrical substrate 111 while the cylindrical substrate 111 is rotated about the axis of the cylinder, thereby coating the coating material F on the circumferential surface of the substrate. The application range of the present invention is not particularly limited, but the coating material viscosity is preferably 100 cP to 100,000 cP, more preferably 500 cP to 5,000 cP, and the film thickness immediately after coating is 20 μm or less.

[0066] At this time, the target film thickness of the coating F is determined, and the discharge amount of the coating F, the rotation speed of the cylindrical substrate 111, and the Y-direction moving speed of the coating head 122 are appropriately set. The setting values ​​of each amount are determined based on the coating scattering in the circumferential direction, the coating position accuracy on the circumferential surface of the cylindrical substrate 111, and the productivity. As a result, the coating F becomes a flat coating film, according to the combination of the coating properties and each set amount. Figure 5 (a) shows a coating film having an uncoated portion, Figure 5 (b) Any form of the coating film with concavoconvexity shown. In the case of a coating film with coating stripes, a flattening process is implemented in which the airflow collides with the coating F. However, when the coating viscosity is high and the target film thickness is thin, the energy required for flattening is large, and the moving speed of the airflow jet portion needs to be slow, so the flattening process time is long. In this case, the flattening process time can be shortened by the flattening realized by a plurality of airflow jet portions proposed by the present invention.

[0067] At this time, the surface coated with the coating is in a state where the spiral coating stripes extend spirally forward, backward, left and right, and can be flattened. Figure 1 As described in , from the perspective of uniformly flattening the coating film, it is preferred to apply the coating film over the entire circumference and width, and then use multiple airflow injection units and their moving units and driving units to flatten the coating film while moving the airflow injection units in the axial direction of the cylindrical substrate 111.

[0068] After the coating F is ejected to form a coating film, the following steps are included: while rotating the cylindrical substrate at a speed different from the rotation speed during coating, multiple airflow injection units are used to inject airflow toward a part of the circumference of the cylindrical substrate, and the airflow is injected while the multiple airflow injection units are linearly moved in the axial direction of the cylindrical substrate. This step is a step of flattening the coating F on the circumference of the substrate.

[0069] In the process of jetting airflow, a plurality of airflow jetting units are arranged at a certain interval in the axial direction, and the plurality of airflow jetting units are moved linearly in the axial direction at the same speed while jetting airflow simultaneously, and the paint F is flattened while jetting airflow to the entire area of ​​the circumference of the coating to form a coating film. In the coating method of the present invention, the plurality of airflow jetting units jet airflow to the entire area of ​​the circumference of the coating, so that after the coating is applied, the jetting area of ​​each airflow covers a narrow range relative to the entire circumference of the circumference, shortening the flattening treatment time and improving productivity.

[0070] use Figure 6 The process of flattening the coating film by jetting airflow is described below. Figure 6 As shown in (a), after the coating is completed, the moving unit of the airflow injection unit is driven to move the airflow injection head 142 to a predetermined starting position. At this time, the airflow injection unit 141 located at the leftmost end in the Y direction is located at the leftmost end of the coating F on the circumferential surface of the cylindrical substrate 111. Then, the cylindrical substrate 111 is rotated at a speed suitable for the flattening treatment, and the movement of the airflow injection unit 141 in the axial direction of the cylindrical substrate 111 at a predetermined speed is started. Regarding the rotational drive of the cylindrical substrate 111, it is rotated at a speed different from the rotational speed during coating. From the viewpoint of moving the coating film through the airflow, the rotational speed is preferably small.

[0071] At the same time, the gas supply pressure is controlled in the pressure control unit 143 so that the supply pressure rises from 0 to a predetermined supply pressure, and the gas G is injected. Then, while the injected gas G collides with the coating film, thereby generating a liquid flow of the coating film on the collision surface, and the liquid surface of the coating film is kept pressed to the peripheral surface by the pressure of the gas G, the airflow injection unit 141 as the airflow injection unit is moved, thereby applying a liquid flow from the starting point of the movement to the destination of the movement, thereby promoting the flattening of the coating film. If a plurality of airflow injection units 141 are incorporated into the airflow injection head 142, it is easy to arrange them at a certain interval in the axial direction, and a plurality of airflow injection units are easy to move in a straight line at the same speed in the axial direction while injecting airflow. At this time, the direction of the gas injection head 142 having a plurality of airflow injection units 141 is preferably such that the pressing pressure generated by the gas G is generated larger and is oriented in a direction perpendicular to the coating film. In addition, the slower the moving speed of the gas injection head 142, the easier it is to generate liquid flow. Therefore, by moving the gas injection head 142 while simultaneously injecting gas G from multiple airflow injection parts 141, the coating film can be flattened in a short time over a wide range even at a slow moving speed.

[0072] That is, in Figure 8In the film thickness shape of the coating liquid in stripe shape shown as an example in (a), by having a plurality of airflow injection units of the present invention and moving them simultaneously while injecting airflow at a certain interval in the axial direction, the coating stripes can be efficiently and uniformly flattened. In other words, if the airflow injection holes arranged at a certain interval in the axial direction are not moved simultaneously in the axial direction, Figure 8 As shown in (d), a stripe-like film thickness shape remains, and the effect of planarization cannot be obtained.

[0073] Then, if Figure 6 As shown in (b), when the airflow jetting unit 141 moves to a predetermined stop position and the airflow jetting to the entire coating surface is completed, the driving of the moving unit of the airflow jetting unit and the rotation driving of the cylindrical substrate 111 are stopped, and the gas supply pressure is controlled in the pressure control unit 143 to reduce the supply pressure to 0, so that the jetting of the gas G is stopped. The stop position of the airflow jetting unit 141 is preferably input in advance to the controller 154 for controlling the movement of the airflow jetting unit to stop the movement. The stop position is set in a manner that at least exceeds the initial movement position of another airflow jetting unit 141 adjacent in the moving direction.

[0074] In the flattening process, the moving distance of the cylindrical substrate 111 in the axial direction of the airflow jet part 141 is the sum of the axial spacing between the airflow jet parts and the length of the airflow jet part passing through the flattened coating film of the adjacent other airflow jet parts. From this relationship, it can be seen that in order to shorten the flattening process time, it is effective to increase the number of airflow jet parts and shorten the axial spacing between the airflow jet parts and shorten the length of the airflow jet part passing through the flattened coating film of the adjacent other airflow jet parts.

[0075] Here, in the case of forming a more precise flat surface, the other air jetting parts pass through the coating film that has become flat by the air jetting parts, and the air jetting parts stop on the flat coating film. However, when the supply pressure is kept constant, there may be a problem of generating a problem at the stop position. Figure 5 (c) shows a thick film portion in the form of a liquid pool (coating streak at the stop position).

[0076] This phenomenon may also occur even when the air is uniformly blown by a slit-type air nozzle over the full width. If the gap width is shorter than the width of the coating, the coating pressed by the air expands in a manner pressed toward the coating end, and sometimes striped coating unevenness is produced from the two ends of the gap width to the outside. In the case of cutting off the two ends of the formed coating by post-processing, the uneven coating of the end is not easy to become a problem. However, in the case of requiring high-precision thickness uniformity over the full width, it is preferred that the following conditions not be caused by uneven coating.

[0077] In this case, the thick film portion in the form of liquid accumulation is generated by the flow of liquid caused by the collision of the gas G, and the greater the injection pressure of the gas G, the greater the amount of liquid accumulation. In other words, the greater the injection pressure at the end of the flattening treatment, the thick film portion is more likely to remain. Therefore, in order to improve the thick film portion, that is, to improve the uneven coating, after the entire coating film is flattened with the supply pressure required for the flattening treatment, the treatment action is not stopped immediately, but the supply pressure is gradually reduced and the treatment action is stopped, thereby preventing the thick film portion from remaining. Figure 5 (c) is preferably used to form a flatter film surface by removing the thick film portion as shown in FIG. That is, it is preferred that the plurality of airflow injection units move in the axial direction while injecting an airflow of a certain supply pressure, and in the interval from after the flattening treatment of the entire coating film to before the movement stops, the air supply pressure is continuously reduced from a certain supply pressure, thereby easing the movement of the coating film. Thus, by dispersing and consuming the coating liquid of the thick film portion generated by the injection pressure on the coating film, it is possible to prevent the thick film portion from being generated when the processing action stops.

[0078] As an example, in Figure 7 (a) shows the relationship between the supply pressure and the moving distance of the airflow ejection unit. As shown in the graph, the gas G can be ejected at a constant supply pressure until the moving distance reaches X1. After the moving distance reaches X1, the collision force of the airflow is reduced by continuously reducing the supply pressure, thereby reducing the amount of paint moved and forming a flat coating film.

[0079] In addition, as a similar means, there is also a method of increasing the moving speed of the airflow jet portion. By increasing the moving speed, the size of the liquid flow generated by the collision of the gas G is reduced even when the jet pressure is constant, so the same effect as when the jet pressure is reduced can be obtained.

[0080] This example will be Figure 7 (b) is shown. This is a graph showing the relationship between the moving speed and the moving distance of the airflow injection unit 141, that is, the airflow injection unit. In the control operation, the gas G is injected at a certain moving speed until the moving distance reaches X1. After the moving distance reaches X1, the collision force of the airflow is reduced by continuously increasing the moving speed, thereby forming a coating film while reducing the amount of paint moved. In addition, when the movement stops, the supply pressure is preferably substantially zero. Figure 7 The moving distance X1 at which the supply pressure starts to decrease and the rate of decrease of the supply pressure in (a) are set to be such that Figure 5 The coating stripes shown in (a) or (b) are flattened and Figure 5 (c) shows the value of flattening the liquid-like coating stripes. Figure 7The magnitude of the constant moving speed in the graph shown in (b) is assumed to be based on a constant rotation speed of the cylindrical substrate and a constant supply pressure. Figure 5 (a) or (b) shows the size of the flattened coating stripes. Figure 7 The moving distance X1 at which the moving speed starts to increase and the increasing rate of the moving speed in (b) are set to be able to Figure 5 The coating stripes shown in (a) or (b) are flattened and Figure 5 (c) is the value of flattening the liquid-like coating stripes.

[0081] In the process of spraying the airflow for flattening the coating film, in order to make the airflow spraying section 141 as the airflow spraying unit move stably at a low speed, the airflow spraying head 142 is mounted on the stage 151 and the slider 152, and can be moved by driving the actuator 153 provided at the end of the stage. In addition, it is preferable to use the controller 154 for controlling the movement to control the movement amount, stop information, and the driving of the actuator 153. In addition, after the movement distance reaches X1, in order to continuously reduce the supply pressure, it is also preferable to send a signal from the controller 154 for controlling the movement to the pressure controller 143 of the airflow spraying, and perform a process of reducing the spraying pressure to ease the movement of the coating film.

[0082] <About Curing of Coating Film>

[0083] After the flattening treatment of the coating film, the coating film is cured to stop the flow of the coating liquid. The curing method is not limited to heat curing, UV irradiation curing, etc., but it is preferably performed while maintaining the rotation state in order to suppress the flow of the liquid after flattening.

[0084] <About the shape of the substrate>

[0085] The cylindrical substrate to which the present invention is applied may be any substrate having a cylindrical outer shape, and includes substrates having a hollow cylindrical shape.

[0086] <About Application to Production of Waterless Planographic Printing Plate Precursors>

[0087] As an effective use of the present invention, there is an application to the manufacturing process of a waterless planographic printing plate original for waterless printing, which includes a process of applying a high-viscosity coating in the form of a thin film on a cylindrical substrate. Waterless printing does not use soaking water containing organic solvents in its printing process, so it is well known as an environmentally friendly printing method. However, in recent years, a method of forming a functional film without using organic solvents as much as possible in the original plate manufacturing process in addition to the printing process has been sought. In the case where the dilution of the coating by an organic solvent is limited, it is necessary to deal with the high viscosity of the coating and apply it in a thin film. The coating process of the functional film, that is, the surface layer of the silicone film constituting the waterless planographic printing plate original is also one of them. By applying the present invention, a uniform thin film can be formed.

[0088] The process for producing a waterless planographic printing plate precursor is to use the original plate substrate before the silicone layer is formed on the cylindrical substrate in the present invention, apply the silicone material coating as the coating by the above-mentioned coating method, and spread it thinly by the flattening unit, thereby forming a uniform coating film. In addition, the coating film formation conditions at this time are described in Example 4.

[0089] Example

[0090] Hereinafter, specific embodiments of the present invention will be described using Examples, but the present invention is not limited to these Examples at all.

[0091] <Example 1>

[0092] Use with Figure 1 to Figure 4 A coating film was formed on a cylindrical substrate using a coating device having the same structure as shown. A cylindrical substrate with an outer diameter of 185 mm was placed on the coating device and rotated at 400 rpm. Then, the coating was arranged on the circumference of the cylindrical substrate so that a flat coating film was uniformly formed on the circumference of the cylindrical substrate and the film thickness was 5.0 μm. A shear viscosity of 1×10 3 cP (temperature 23°C). The coating was arranged in a spiral shape on the circumference of the cylindrical substrate by discharging a liquid column at a discharge rate of 31 μl / sec using a nozzle with an outlet diameter of 0.25 mm while moving the cylindrical substrate in parallel at a speed of 10.7 mm / sec in the axial direction of the cylindrical substrate.

[0093] At this time, in order to improve the accuracy of the liquid landing position, the nozzle was directed toward the rotation direction of the cylindrical substrate, and the gap between the nozzle tip and the cylindrical substrate in the radial direction of the cylindrical substrate was 2 mm, and the coating was performed. As a result, the coatings did not bond to each other on the peripheral surface of the cylindrical substrate, resulting in Figure 5 (a) shows an uncoated portion 201 between a coating and an adjacent coating. The coating and planarization treatment were performed at room temperature of 23°C.

[0094] In this embodiment, the airflow injection unit is equivalent to the airflow injection unit 141, and a plurality of airflow injection units 141 are arranged in the axial direction of the cylindrical substrate. Figure 3 As shown, a plurality of airflow ejection units 141 are mounted on an airflow ejection head 142, which are connected to a stage 151, a slider 152, and an actuator 153 as a moving mechanism. The airflow ejection unit 141 has an ejection hole for ejecting airflow in a nozzle shape at the tip.

[0095] After the coating was placed, the coating was flattened using multiple airflow jets 141. The rotation speed of the cylindrical substrate was reduced to 25 rpm. In addition, the gap with the cylindrical substrate was set to 5 mm. The airflow obtained by pressurizing the air was ejected from each jet hole in such a way that the pressure when colliding with the peripheral surface was 140 kPa, and the multiple airflow jets 141 were moved in parallel in the axial direction at a moving speed of 0.20 mm / s.

[0096] Specifically, the spacing between the airflow injection units, i.e., the airflow injection parts, is adjusted to 20 mm, the number of injection parts is 16, and the air flow rate injected from each airflow injection part is equal, and then arranged along the axial direction of the cylindrical substrate. The shape of the airflow injection part is a conical nozzle shape, and the outlet diameter is 1.6 mm. The length of the airflow injection part passing through the coating film flattened by other adjacent airflow injection parts is 20 mm, and the moving distance of the airflow injection unit, i.e., the airflow injection part, is 40 mm. In addition, in the range of 0 mm to 40 mm, the supply pressure is 0.19 MPa, and the airflow is injected.

[0097] By the above process, the uncoated portion 201 between the coating and the adjacent coating can be made flat in appearance. In addition, when the airflow jet portion is 1, the flattening time is about 5000 seconds (about 1.4 hours) for the length of the cylindrical substrate per 1m. On the other hand, when the spacing between the airflow jet portions is 20mm and multiple airflow jet portions are set, the flattening time can be 200 seconds (about 3 minutes) for the length of the cylindrical substrate per 1m. That is, by arranging multiple airflow jet portions, the flattening time can be shortened to 1 / 25 of the case where the airflow jet portion is 1.

[0098] <Example 2>

[0099] Use with Figure 1 to Figure 4 The coating device with the same structure as shown in the figure forms a coating film on a cylindrical substrate. The pressure of the pressurized air of the nozzle-shaped airflow ejection unit as the airflow ejection unit is adjusted. Figure 7The graph shown in (a) is the same as that of Example 1 except that the supply pressure is kept constant in the interval of 0 to 10 mm from the movement start position and is linearly reduced to 0.11 MPa in the interval of 10 to 40 mm.

[0100] By providing a plurality of airflow jetting units, the flattening treatment time can be shortened compared to the case where there is only one airflow jetting unit. Furthermore, by controlling the supply pressure, the pressure at each position where the plurality of airflow jetting units stop can be suppressed. Figure 5 (c) shows the formation of a thick film portion with a liquid accumulation shape. Figure 8 (b) shows the film thickness shape in Example 1. Figure 8 (c) shows the film thickness shape in Example 2. That is, (b) is the film thickness shape without supply pressure control, and (c) is the film thickness shape with supply pressure control. By performing supply pressure control in Example 2, the maximum film thickness near the stop position of the airflow injection part is reduced from 6.0μm to 5.2μm, forming a more uniform and high-quality coating surface. Figure 7 The same effect can be obtained by controlling the moving speed of the airflow ejection part using the graph shown in (b).

[0101] <Example 3>

[0102] Use with Figure 1 to Figure 4 The coating device having the same structure as shown above forms a coating film on a cylindrical substrate. The process of placing the coating material in a spiral shape on the circumference of the cylindrical substrate is the same as that of the first embodiment.

[0103] Next, the rotation speed of the cylindrical substrate is decelerated. Then, the gap with the cylindrical substrate is set so that the air-pressurized air-jet unit moves in parallel at a certain speed. With respect to the air-jet unit, after adjusting the spacing between the air-jet units to be constant and the air flow rate ejected from each air-jet unit to be equal to that in Example 1, a plurality of air-jet units are arranged along the circumference of the cylindrical substrate, and the air-jet units are multiplied in the circumferential direction. Then, the supply pressure is kept constant and the air-jet is ejected.

[0104] Through the above steps, the uncoated portion 201 between the coating and the adjacent coating can be made flat in appearance. In addition, since the airflow injection unit is multiplexed in the circumferential direction, the time for injecting the airflow in the rotation direction becomes longer, and the axial movement speed can be increased compared with the movement speed of the airflow injection unit in Example 1. By providing multiple airflow injection units, the flattening treatment time can be shortened compared with the case where there is only one airflow injection unit.

[0105] <Example 4>

[0106] Use with Figure 1 to Figure 4 A waterless planographic printing plate original was manufactured using a manufacturing device having the same structure as shown. A layer was formed by applying a silicone coating on a cylindrical substrate. The dimensions of the cylindrical substrate before the application of the silicone coating were an outer diameter of 185 mm and an axial length of 1000 mm. Silicone coating was used. The application of the silicone coating was the same as in Example 1, using a nozzle with an outlet diameter of 0.25 mm, with a discharge volume of 31 μl / second, while discharging in the form of a liquid column and moving it parallel to the axial direction of the cylindrical substrate at a speed of 10.7 mm / second, thereby applying a silicone coating having an average film thickness of 5.0 μm on the circumferential surface of the cylindrical substrate. Next, using an airflow injection unit 141 having the same structure as in Example 1, the silicone coating film was flattened under the same conditions as in Example 2, thereby being able to flatten the entire axial width of the silicone coating film in 200 seconds to form a uniform silicone layer of 5.0 μm. In addition, even if another coating layer is formed in advance on the cylindrical substrate, the same effect can be obtained. In addition, the silicone coating is prepared by the following method.

[0107] <Silicone coating>

[0108] The following components (a-1), (b-1) and (c-1) are added to a sealable container, the container is sealed, and the components are stirred and mixed at room temperature until the components become uniform. The component (d-1) is added to the obtained composition, the container is sealed, and the components are stirred and mixed at room temperature until the components become uniform, thereby obtaining a coating.

[0109] (a-1) DMS-V31 (dimethylvinylsiloxy-polydimethylsiloxane with dimethylvinylsiloxy groups at both ends, weight average molecular weight: 28,000, average number of vinyl groups in the molecule: 2, manufactured by GELEST Inc.): 95.89 parts by mass

[0110] (b-1) "DOWSIL" (registered trademark) SRX212 Catalyst (platinum mixture, manufactured by Dai Toray Industries, Inc.): 0.11 parts by mass

[0111] (c-1) 3,5-dimethyl-1-hexyn-3-ol (manufactured by Tokyo Chemical Industry Co., Ltd.): 0.30 parts by mass

[0112] (d-1) "SILASTIC" (registered trademark) RD-1 Catalyst (copolymer of trimethylsilyloxy-methylhydrogensiloxane / dimethylsiloxane at both ends, weight average molecular weight: 750, average number of SiH groups in the molecule: 5, manufactured by Dai Toray Industries, Inc.): 4.00 parts by mass.

[0113] <Comparative Example 1>

[0114] The process of placing the coating material in a spiral shape on the peripheral surface of the cylindrical substrate is the same as that of the first embodiment.

[0115] Next, the rotation speed of the cylindrical substrate was decelerated. As the airflow injection unit, a slit nozzle having a width substantially the same as that of the substrate was used. The length direction of the wide slit nozzle was arranged in a manner consistent with the axial direction of the cylindrical substrate, and the position was fixed. No axial movement was performed. Furthermore, the supply pressure was kept constant, and the airflow was injected.

[0116] As a result, the amount of paint moving in the axial direction becomes insufficient, and the coating film cannot be flattened. Although the amount of paint moving in the cylindrical circumferential direction is large, the amount of paint moving in the axial direction becomes insufficient because it is not accompanied by the movement of the airflow injection portion in the cylindrical axial direction. In addition, uneven coating occurs at the end of the gap.

[0117] <Comparative Example 2>

[0118] The process of placing the coating material in a spiral shape on the circumference of the cylindrical substrate is the same as that of Example 1. Next, the rotation speed of the cylindrical substrate is reduced. Figure 3 The plurality of airflow injection units 141 shown are arranged over the entire width of the cylindrical substrate at intervals of 5 mm narrower than in Example 1, and the airflow is injected while the supply pressure is kept constant without moving in the axial direction. That is, the airflow is injected from each injection hole while the movement of the airflow injection hole (airflow injection unit) serving as the airflow injection unit is stopped. Figure 8 (a) shows the film thickness shape before air flow injection, Figure 8 (d) shows the film thickness shape after the air flow is injected. The result of the flattening of the film thickness is that the amount of paint moving in the axial direction becomes insufficient, such as Figure 8 As shown in (d), in the thickness range of 3.0 to 7.0 μm, the uneven film thickness during coating was not flattened and remained.

[0119] Description of Reference Numerals

[0120] 100: coating device

[0121] 110: Rotation drive unit

[0122] 111: Cylindrical substrate

[0123] 112, 113: Rotation center axis

[0124] 114, 115: Support platform

[0125] 116: Actuator

[0126] 117: Rotation speed controller

[0127] 121: Exhalation nozzle

[0128] 122: coating head

[0129] 123: Dosing pump

[0130] 124: Paint cans

[0131] 131: Carrier

[0132] 132: Sliders

[0133] 133: Actuator

[0134] 134: Controller for controlling the movement of the coating unit

[0135] 141: Airflow injection unit

[0136] 142: Air jet head

[0137] 143: Pressure controller for air jet

[0138] 144: Compressed gas supply source

[0139] 151: Carrier

[0140] 152: Sliders

[0141] 153: Actuator

[0142] 154: A controller for controlling movement of the airflow injection unit

[0143] 200: Uneven coating

[0144] 201: Uncoated area between the coating and the adjacent coating

[0145] 202: Coating stripes

[0146] F: Paint

[0147] G: Gas

[0148] R: Rotation direction

[0149] P: Linear movement direction

Claims

1. A coating device, The invention comprises at least one coating unit for coating a coating on a circumferential surface of a cylindrical substrate, at least one rotation driving unit for rotating the cylindrical substrate with the axis of the cylinder as the central axis, at least one airflow injection unit for injecting airflow to a part of the circumferential surface of the cylindrical substrate, and at least one moving unit for enabling the airflow injection unit to move in the axial direction of the cylindrical substrate in a manner of injecting airflow to the circumferential surface coated with the coating, The airflow injection unit includes a plurality of airflow injection units, and the plurality of airflow injection units, the moving unit, and the rotation driving unit are used to inject airflow to the entire area of ​​the peripheral surface where the paint is applied. The coating unit includes a moving unit that moves the coating ejection hole in a direction different from the direction in which the circumferential surface of the substrate rotates by the rotation driving unit, i.e., in the axial direction of the cylindrical substrate, and the coating is applied by moving the moving unit. The movement of the ejection hole realized by the moving unit of the coating unit and the movement of the airflow injection unit realized by the moving unit that moves the airflow injection unit can be independently controlled.

2. The coating device according to claim 1, The plurality of airflow injection units are arranged at regular intervals in a direction parallel to the rotation axis of the cylindrical substrate, and each airflow injection unit maintains a regular gap with the peripheral surface of the cylindrical substrate in a radial direction.

3. The coating device according to claim 1 or 2, The airflow jetting means further includes means for controlling the pressure of the jetted airflow or the distance between the jetting portion of the airflow and the peripheral surface to which the coating material is applied.

4. The coating device according to claim 1 or 2, The moving unit that enables the airflow jetting unit to move further includes a unit for controlling the moving distance and / or moving speed of the airflow jetting unit.

5. The coating device according to claim 1 or 2, The unit for controlling the pressure of the injected airflow includes a determiner that determines the start point and / or end point of the movement in conjunction with the moving unit of the airflow injection unit, and a controller that stores information on the movement amount of the input moving unit and the pressure of the airflow and executes a program for a predetermined scan.

6. A method for forming a coating film, characterized in that: The coating film is formed by discharging the coating material onto the peripheral surface of the cylindrical substrate from the coating material discharging hole which moves linearly in the axial direction while the cylindrical substrate is rotated about the axis of the cylinder as the central axis. Then, the following steps are included: while rotating the cylindrical substrate at a speed different from the rotation speed during coating, using a plurality of airflow injection units that inject airflow toward a portion of the circumference of the cylindrical substrate, injecting airflow while linearly moving the plurality of airflow injection units in the axial direction of the cylindrical substrate at a speed different from the moving speed of the ejection hole during coating the cylindrical substrate, In the step of injecting airflow, a plurality of airflow injection units are arranged at regular intervals in the axial direction, and the plurality of airflow injection units move linearly in the axial direction at the same speed while injecting airflow simultaneously, injecting airflow to the entire peripheral surface to which the coating material is applied.

7. The coating film forming method according to claim 6, characterized in that: The multiple airflow injection units are air nozzles that inject airflow from injection holes. The multiple airflow injection units move in the axial direction at a certain moving speed while injecting airflow with a certain supply pressure or a certain flow rate. Before the movement stops, the air supply pressure or flow rate is continuously reduced from a certain supply pressure or a certain flow rate.

8. The coating film forming method according to claim 6, characterized in that: The multiple airflow injection units are air nozzles that inject airflow from injection holes. The multiple airflow injection units move in the axial direction at a certain moving speed while injecting airflow with a certain supply pressure, and continuously increase the moving speed from the certain moving speed before stopping.

9. A method for producing a waterless planographic printing plate precursor, characterized in that: By using the coating film forming method according to any one of claims 6 to 8, a coating film made of a silicone material is formed on the peripheral surface of a cylindrical substrate.

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