JP2016083622A - Coating device and coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating device and a coating method in which incorporation of air bubbles into coating liquid can be suppressed.SOLUTION: The coating device is provided that includes a coating roller for coating a coated object with coating liquid and having a recessed portion on an outer circumferential surface, and a supply part having a chamber and for supplying the coating liquid in the chamber to at least the recessed portion of the outer circumferential surface of the coating roller. The coating device is configured to coat the coated object with the coating liquid by abutting the coating liquid supplied to the recessed portion against the coated object while rotating the coating roller. The coating device further includes a filling part for filling the recessed portion of the outer circumferential surface of the coating roller after coating, with coating liquid, and the filling part is configured to expose the coating liquid and is arranged in such a manner that the recessed portion of the outer circumferential surface is filled with the coating liquid before coating liquid is supplied from the supply part. The coating method using the coating device is also provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating apparatus such as a gravure coating apparatus and a coating method such as a gravure coating method.

  2. Description of the Related Art Conventionally, as the above-described coating apparatus, for example, a gravure coating apparatus including a coating roller that applies a coating liquid to an object to be coated such as a sheet member is known.

  Such a gravure coating apparatus includes a columnar coating roller having a recess on an outer peripheral surface, and a supply unit that supplies a coating liquid to the outer peripheral surface of the coating roller. The gravure coating apparatus continuously applies the coating liquid to the object to be coated by rotating the coating roller while the coating liquid supplied to the outer peripheral surface of the coating roller is in contact with the object to be coated. It is constituted so that it may coat.

  In such a gravure coating apparatus, the supplied coating liquid enters the concave portion of the outer peripheral surface of the coating roller, and the coating roller rotates while a part of the outer peripheral surface is in contact with the workpiece. Thereby, the coating liquid of the recessed part of the outer peripheral part contact | abutted with the to-be-coated article is applied to the to-be-coated article. Further, in such a gravure coating apparatus, the coating liquid is transferred from the concave portion on the outer peripheral surface of the coating roller to the object to be coated, and the coating roller further rotates. Then, the coating liquid is supplied from the supply unit to the outer peripheral surface in which a void is formed in the recess. When the outer peripheral surface with a void in the recess enters the coating solution in the supply unit, the air in the recess and the coating solution mix, and bubbles are mixed into the coating solution applied to the object to be coated. It will be. Thereby, the coating to the object to be coated becomes non-uniform and the coating performance becomes insufficient.

  On the other hand, it is a plate-like inner member arranged in the chamber of the supply unit so as to partition the supply unit into the rear side and the front side in the rotation direction of the coating roller, and the end portion of the coating roller is A gravure coating apparatus provided with an inner member that is always in contact with the outer peripheral surface has been proposed (see Patent Document 1).

  In the gravure coating apparatus described in Patent Document 1, it is possible to suppress the bubbles mixed in the coating liquid from moving to the front side in the rotation direction in the supply unit (chamber) by the inner member. That is, the inner member can suppress the coating liquid once mixed with bubbles on the rear side in the rotation direction in the chamber from moving to the front side in the rotation direction of the supply unit. Therefore, the coating liquid with relatively little bubble mixing can be supplied to the outer peripheral surface of the coating roller on the front side in the rotation direction in the chamber. Thereby, the coating liquid with comparatively few mixing of air bubbles can be applied to an object to be coated.

JP 2012-170835 A

  However, in the gravure coating apparatus described in Patent Document 1, it is not always possible to sufficiently prevent bubbles from moving from the rear side to the front side in the rotation direction in the chamber even by the inner member. Therefore, it is not always possible to sufficiently suppress bubbles from being mixed into the coating liquid in the supply section (chamber).

  This invention makes it a subject to provide the coating apparatus and coating method which can suppress that a bubble mixes in a coating liquid in view of the said situation.

The coating apparatus according to the present invention is
A coating roller for applying a coating liquid to an object to be coated and having a recess on the outer peripheral surface;
A supply section for supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller having a chamber;
While rotating the coating roller, the coating liquid supplied to the recess is brought into contact with the object to be coated, thereby being configured to apply the coating liquid to the object to be coated.
In addition, a filling portion for filling the coating liquid in the concave portion of the outer peripheral surface of the coating roller after coating,
The filling part is configured to expose the coating liquid, and is disposed so as to fill the concave part on the outer peripheral surface before the coating liquid is supplied from the supply part.

  In the coating apparatus having such a configuration, the coating liquid supplied to the recesses on the outer peripheral surface of the coating roller is applied to the object to be coated by the rotation of the coating roller. That is, the coating liquid in the recess is transferred in contact with the workpiece. Further, the coating liquid is filled in the concave portion by the rotation of the coating roller in the filling portion. Even if the coating roller with a gap in the recess moves to the filling part due to the transfer and bubbles are brought into the filling part, the coating liquid is exposed at the filling part, so the bubbles are mixed into the coating liquid. Without being released into the air. As a result, the filling section can reliably fill the coating liquid in which bubbles are not mixed into the recesses on the outer peripheral surface of the coating roller, and the supply section located in the rotational direction of the coating roller can be filled with bubbles. Can be prevented. Therefore, according to the coating apparatus having such a configuration, air bubbles can be prevented from being mixed into the coating liquid.

Moreover, in the coating apparatus of this invention, a supply part may be comprised so that a coating liquid may be supplied to the recessed part of the outer peripheral surface of a coating roller, circulating a coating liquid.
Here, when the supply unit is configured to supply the coating liquid to the recesses on the outer peripheral surface of the coating roller while circulating the coating liquid, the coating liquid is circulated in the supply unit. Once the bubbles in the coating liquid in the concave portion are once mixed with the coating liquid in the supply section, the coating liquid mixed with bubbles is continuously supplied to the outer peripheral surface. When the amount of bubbles mixed in increases, the coating liquid to be circulated in the supply unit is replaced with a new coating liquid. However, since it is possible to suppress bubbles from being mixed into the coating liquid by the filling unit, it is not necessary to replace the coating liquid in the supply unit in which the bubbles are mixed with a new coating liquid.

Moreover, in the coating apparatus of this invention, the filling part may be comprised so that the coating liquid stored may be filled in the recessed part of the outer peripheral surface of a coating roller, storing the coating liquid.
In the coating apparatus having such a configuration, the coating liquid can be more reliably filled into the concave portion because the coating liquid is stored in the filling section.

The coating method according to the present invention is:
A coating roller for applying a coating liquid to an object to be coated, and rotating the coating roller having a recess on the outer peripheral surface, and abutting the coating liquid supplied to the recess to the object to be coated A coating step of applying the coating liquid to an object to be coated,
The coating process includes
A supply step of supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller;
A filling step of filling the concave portion of the outer peripheral surface of the coating roller after the coating with a coating liquid,
In the filling step, the coating solution is exposed, and before the coating solution is supplied in the supply step, the concave portion of the outer peripheral surface is filled with the coating solution.

In the coating method of this invention, you may supply the said coating liquid to the said recessed part of the outer peripheral surface of the said coating roller in the said supply process, circulating the said coating liquid.
Further, in the filling step, the coating liquid stored while storing the coating liquid may be filled in the concave portion of the outer peripheral surface of the coating roller.

  As described above, according to the present invention, it is possible to provide a coating apparatus and a coating method that can prevent bubbles from being mixed into the coating liquid.

Sectional drawing which shows schematically the cross section which cut | disconnected the coating apparatus of one Embodiment of this invention in the direction perpendicular | vertical to the rotating shaft of a coating roller. Sectional drawing which expands and shows a part of FIG. 1 schematically. The photograph showing the external appearance of the coating liquid after operating a coating apparatus.

  An embodiment of the coating apparatus of the present invention will be described. Although this embodiment demonstrates the example which employ | adopted the sheet member B as the to-be-coated article B, the to-be-coated article B is not limited to the sheet member B.

As shown in FIG. 1, the coating apparatus 1 of the present embodiment is a coating roller 2 that applies a coating liquid A to an object to be coated B, and has a coating roller 2 having a recess 2 a on the outer peripheral surface. And a supply unit 3 for supplying the coating liquid A in the chamber to at least the recess 2a of the outer peripheral surface of the coating roller 2 having a chamber.
The coating apparatus 1 of the present embodiment applies the coating liquid A by bringing the coating liquid A supplied to the recess 2a into contact with the workpiece B while rotating the coating roller 2. It is comprised so that it may apply to the thing B. The coating apparatus 1 provided with the coating roller 2 as described above is generally called a gravure coating apparatus.
The coating apparatus 1 according to the present embodiment further includes a filling unit 4 that fills the recess 2a on the outer peripheral surface of the coating roller 2 after coating with the coating liquid A. The filling unit 4 is configured such that the coating liquid A is exposed. The filling part 4 contacts the coating liquid A with the recess 2a on the outer peripheral surface after the coating liquid A is applied to the workpiece B and before the coating liquid A is supplied from the supply part 3. Arranged to fill. The exposure means a state where the surface of the coating liquid A is in contact with air.

  The coating apparatus 1 according to the present embodiment further includes a blade 6 that removes the coating liquid A outside the recess 2 a from the coating liquid A supplied to the outer peripheral surface of the coating roller 2.

The coating apparatus 1 of this embodiment supplies the coating liquid A to the outer peripheral surface of the coating roller 2 in the supply part 3, and among the coating liquid A supplied to the outer peripheral surface, the coating liquid outside the recessed part 2a. A is configured to be removed by the blade 6. Moreover, the coating apparatus 1 of this embodiment is comprised so that the sheet | seat member B may be moved to a predetermined direction. In addition, the coating apparatus 1 according to the present embodiment uses a part of the coating liquid A supplied to the outer peripheral surface of the coating roller 2 as the coating object B while rotating the coating roller 2 in one direction. The coating liquid A in the recess 2a is continuously applied to the sheet member B while being in contact with the sheet member B. Further, the rotation direction of the coating roller 2 and the moving direction of the sheet member B are configured to be opposite to each other at the coating portion.
Furthermore, the coating apparatus 1 according to the present embodiment is configured so that the outer peripheral surface after the coating liquid A in the recess 2 a is transferred to the sheet member B is applied by the filling unit 4 by rotating the coating roller 2. It is configured to be brought into contact with the working liquid A and to fill the recess 2a with the coating liquid A.
And the coating apparatus 1 of this embodiment is supplied by rotation of the coating roller 2 with the coating liquid A adhering to the outer peripheral surface in which the concave portion 2a is filled with the coating liquid A in the filling section 4. It is configured to move to part 3.

The coating liquid A is usually one that solidifies on the sheet member B after being applied to the sheet member B. Examples of the coating liquid A include a solution containing a polymer material to be cured. Examples of the polymer material to be cured include a thermosetting material, an ultraviolet curable material, and an electron beam curable material.
The coating includes printing and coating.

  The viscosity of the coating liquid A is not particularly limited, but is usually 0.5 Pa · s or more, and more preferably 0.5 to 30 Pa · s. The viscosity of the coating liquid A is a value measured using a rheometer (model RS1, manufactured by HAAKE) at 20 ° C. under a shear rate of 1 (1 / s).

  The sheet member B is usually formed in a belt shape. An example of the sheet member B is a resin film.

  The width of the sheet member B is usually shorter than the length of the coating roller 2 in the rotation axis direction.

  The coating roller 2 is formed in a cylindrical shape. The coating roller 2 is configured to rotate about a cylindrical axis as a rotation axis.

  The coating roller 2 is arranged so that a part of the coating liquid A supplied to the outer peripheral surface comes into contact with a part of the sheet member B. And the coating roller 2 is comprised so that the coating liquid on an outer peripheral surface may contact | abut with the sheet | seat member B along the circumferential direction by at least 1 rotation.

  The outer peripheral surface of the coating roller 2 includes a peripheral surface portion 2b disposed along the circumference when viewed from one side of the cylindrical coating roller 2 in the cylindrical axis direction, and a recess recessed inward from the peripheral surface portion 2b. 2a.

  A plurality of the recesses 2 a are formed on the outer peripheral surface of the coating roller 2. Further, a large number of recesses 2 a are formed over the entire outer peripheral surface of the coating roller 2.

  The coating apparatus 1 of this embodiment is configured such that the sheet member B is pressed against the outer peripheral surface of the coating roll 2.

  The filling part 4 is configured to fill the recess 2a with the coating liquid A in a state where the coating liquid A is exposed (a state where the coating liquid A is exposed to air).

The filling portion 4 is disposed in the vicinity of the outer peripheral surface of the coating roller 2 and has a storage plate 4 a for storing the coating liquid A between the outer peripheral surface of the coating roller 2. Specifically, the storage plate member 4 a is disposed so that at least a part of the end portion is close to the outer peripheral surface of the rotating coating roller 2.
The filling portion 4 causes the storage plate material 4a to store the coating liquid A above the storage plate material 4a while bringing the stored coating solution A into contact with the outer peripheral surface of the coating roller 2 to thereby apply the coating liquid A. Is filled in the recess 2a.

  The portion of the filling portion 4 where the storage plate 4a is close to the outer peripheral surface is in front of the portion where the coating liquid A is applied to the sheet member B in the rotational direction of the coating roller 2. And the supply part 3 is arrange | positioned in the back side rather than the part which supplies the coating liquid A to the coating roller 2. FIG.

  In addition, the coating apparatus 1 of this embodiment supplies the coating liquid A which is the coating liquid A of the same composition as the coating liquid A supplied from the supply part 3 and which has not passed through the supply part 3 to the filling part 4. Is configured to do.

The supply section 3 supplies the coating liquid A to the outer peripheral surface of the coating roller 2 that has passed through the filling section 4 in order to stably transfer the coating liquid A to the workpiece B. It is configured.
The supply unit 3 includes a chamber 3a for supplying the coating liquid A stored therein to the outer peripheral surface of the coating roller 2, an inflow path 3b for allowing the coating liquid A to flow into the chamber 3a, and a coating liquid from the chamber 3a. An outflow path 3c for flowing out A, and a circulation tank 3d for sending the coating liquid A flowing out through the outflow path 3c to the inflow path 3b for circulation.

The chamber 3 a is configured to supply the coating liquid A to the outer peripheral surface of the coating roller 2 that has passed through the filling portion 4.
The chamber 3a is formed in a hollow shape with an opening on the supply destination side of the coating liquid A. The chamber 3 a is configured to supply the coating liquid A from the opening to the outer peripheral surface of the coating roller 2 while filling the internal space with the coating liquid A. That is, the chamber 3a is generally called a closed chamber.
The chamber 3a is disposed on the front side of the filling unit 4 in the rotation direction of the coating roller 2, and is disposed on the rear side of the portion where the coating liquid A is applied to the sheet member B. Yes. Further, the chamber 3 a is arranged so that the opening is along the outer peripheral surface of the coating roller 2.

  The chamber 3a is configured to store the coating liquid A flowing in from the inflow path 3b. Further, the chamber 3a has a seal member in a portion close to the outer peripheral surface of the coating roller 2 so that the coating liquid A does not leak out. The chamber 3 a is configured to supply a part of the coating liquid A stored inside to the outer peripheral surface of the coating roller 2 while suppressing the leakage of the coating liquid A by the seal member.

The inflow path 3b has one side connected to the circulation tank 3d and the other side connected to the chamber 3a. The inflow path 3b has a pump P for pressurizing and feeding the coating liquid A. The inflow path 3b is configured to send the coating liquid A pressurized by the pump P from the circulation tank 3d to the chamber 3a.
Examples of the pump P include conventionally known pumps such as a gear pump, a diaphragm pump, a plunger pump, and a snake pump.

  The outflow path 3c has one side connected to the chamber 3a and the other side connected to the circulation tank 3d. The outflow path 3c is configured to send the coating liquid A from the chamber 3a to the circulation tank 3d.

  The circulation tank 3d is configured to temporarily store the coating liquid A sent via the outflow path 3c.

  The supply unit 3 stores the coating liquid A adhering to the outer peripheral surface of the coating roller 2 in the filling unit 4 and the coating liquid A flowing in from the inflow path 3b in the chamber 3a. Is partly supplied to the outer peripheral surface of the coating roller 2. The supply unit 3 is configured to send the coating liquid A that has not been supplied to the outer peripheral surface of the coating roller 2 in the chamber 3a to the circulation tank 3d through the outflow path 3c. In this way, the supply unit 3 is configured to supply a part of the circulating coating liquid A to the outer peripheral surface of the coating roller 2 while circulating the coating liquid A.

  In the coating apparatus 1 of the present embodiment, the portion in which the coating liquid in the filling unit 4 is filled in the concave portion 2a of the coating roller 2 and the portion in the supply unit 3 that supplies the coating liquid A are the coating roller. 2 are arranged at intervals in the circumferential direction. That is, in the coating apparatus 1 of the present embodiment, the recess 2 a is filled while the outer peripheral surface moves from the filling unit 4 to the supply unit 3 along the circumferential direction of the coating roller 2 by the rotation of the coating roller 2. A part of the coating liquid A is configured to come into contact with air. The portion where the supply unit 3 supplies the coating liquid A to the outer peripheral surface of the coating roller 2 is the rearmost portion to which the coating liquid A is supplied in the rotation direction of the coating roller 2. . Further, the portion where the coating liquid A is filled in the concave portion 2a on the outer peripheral surface of the coating roller 2 in the filling portion 4 is the frontmost portion where the coating liquid A is filled in the concave portion 2a.

The blade 6 is disposed on the foremost side of the chamber 3 a in the rotation direction of the coating roller 2. The blade 6 is usually formed in a plate shape. The blade 6 is arranged so that at least a part thereof is in contact with the peripheral surface portion 2 b of the outer peripheral surface of the coating roller 2.
The blade 6 is configured to remove the coating liquid A adhering to the peripheral surface portion 2b of the outer peripheral surface of the coating roller 2 and leave the coating liquid A in the recess 2a by the contact portion.
Examples of the blade 6 include a doctor blade.

  The coating apparatus 1 according to the present embodiment is configured to perform coating by transferring the coating liquid A remaining in the concave portion 2 a on the outer peripheral surface of the coating roller 2 to the sheet member B by the blade 6. Yes.

  Next, an embodiment of the coating method of the present invention will be described. The coating method of this embodiment can be performed by using said coating apparatus.

The coating method of the present embodiment is a coating roller for applying a coating liquid to an object to be coated, and the coating liquid supplied to the recesses is rotated while rotating the coating roller having the recesses on the outer peripheral surface. A coating process for coating the coating liquid with the coating liquid by bringing it into contact with the coating object is provided.
The coating step includes a supply step of supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller, a filling step of filling the coating liquid in the concave portion of the outer peripheral surface of the coating roller after coating, In the filling step, the coating liquid is filled into the recesses on the outer peripheral surface before the coating liquid is supplied in the supply step while exposing a part of the coating liquid.

  In the supply step, for example, the supply unit 3 supplies the coating solution to the recesses on the outer peripheral surface of the coating roller while circulating the coating solution as described above.

  In the filling step, for example, the filling portion 4 fills the recessed portion on the outer peripheral surface of the coating roller while storing the coating solution as described above.

  In the coating apparatus 1 and the coating method of the above embodiment, the coating liquid A supplied to the concave portion 2a on the outer peripheral surface of the coating roller 2 is applied to the coating object B by the rotation of the coating roller 2. Painted on. That is, the coating liquid A in the recess 2a is transferred in contact with the workpiece B. Furthermore, the coating liquid A is filled in the concave portion 2 a by the filling portion 4 by the rotation of the coating roller 2. Even if the coating roller 2 in which a gap is formed in the recess 2a by the transfer moves to the filling unit 4 and bubbles are brought into the filling unit 4, the stored coating liquid A is exposed in the filling unit 4. Bubbles are released into the air without being mixed into the coating liquid. Thereby, the filling part 4 can reliably fill the coating liquid A in which no bubbles are mixed into the recess 2 a on the outer peripheral surface of the coating roller 2. Air bubbles can be prevented from being brought into a certain supply unit 3. Therefore, according to the coating apparatus having such a configuration, air bubbles can be prevented from being mixed into the coating liquid A.

  In the coating apparatus 1 and the coating method, the supply unit 3 is configured to supply the coating liquid A to the outer peripheral surface of the coating roller 2 while circulating the coating liquid A. Since the coating liquid A is circulated in the supply unit 3, once the bubbles in the coating liquid A in the recess 2 a are mixed with the coating liquid A in the supply unit 3, the coating liquid A in which bubbles are mixed Will continue to be supplied to the outer peripheral surface. When the amount of bubbles mixed in increases, the coating liquid A circulated in the supply unit 3 is replaced with a new coating liquid. However, since it is possible to suppress bubbles from being mixed into the coating liquid A by the filling unit 4, it is not necessary to replace the coating liquid A in the supply unit 3 in which bubbles are mixed with a new coating liquid.

  Further, in the coating apparatus 1 and the coating method described above, the filling unit 4 is configured to fill the recessed portion of the outer peripheral surface of the coating roller 2 with the stored coating solution A while storing the coating solution A. Has been. Therefore, since the coating liquid A is stored in the filling unit 4, the coating liquid A can be more reliably filled into the recess 2a.

  Further, the coating apparatus 1 is filled with the storage plate material 4a arranged so that at least a part of the end portion is close to the outer peripheral surface of the rotating coating roller 2 in the coating method. Since it is provided as the portion 4, the filling portion 4 has a relatively simple configuration. Therefore, it is possible to suppress bubbles from being mixed into the coating liquid A by the filling unit 4 having a relatively simple configuration.

  Although the coating apparatus 1 and the coating method of this embodiment are as above-mentioned, this invention is not limited to the said embodiment, A design change is possible suitably within the range which this invention intends. is there.

  For example, the coating device of the above embodiment is configured to fill the recessed portion 2 a on the outer peripheral surface of the coating roller 2 with the filled portion 4 having the storage plate 4 a. However, the filling unit 4 of the coating apparatus of the present invention has, for example, a rotating roller, and rotates the rotating roller while bringing the rotating roller close to the outer peripheral surface of the coating roller 2, thereby allowing the filling roller 4 to rotate on the outer peripheral surface of the rotating roller. The coating liquid A may be configured to be filled in the recesses on the outer peripheral surface of the coating roller 2.

  In the coating apparatus and the coating method of the above embodiment, the coating liquid A having the same composition as the coating liquid A supplied from the supply unit 3 is filled with the coating liquid A that has not passed through the supply unit 3. In the coating apparatus and the coating method of the present invention, the coating liquid circulated in the supply part is sent to the filling part, and the sent coating liquid is filled in the recess 2a in the filling part. May be.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these.

  Under the conditions shown below, the coating apparatuses of Test Example 1 and Test Example 2 were operated, and the coating method was performed.

(Test Example 1)
The coating apparatus of the above embodiment was operated. Detailed operating conditions during operation are as follows.
Sheet member: Resin film (width 0.5m)
Movement speed of sheet member: 20 m / min. Movement direction of sheet member and rotation direction of coating roller: opposite direction Rotational speed ratio of outer peripheral surface of coating roller (vs. sheet member movement speed): 1.6
Coating roller diameter: 10cm
Circulating coating solution at supply section

(Test Example 2)
The coating apparatus was operated in the same manner as in Test Example 1 except that a coating apparatus not equipped with a filling unit was used.

In Test Example 1 and Test Example 2, the results of observing the appearance of the coating liquid passing through the outflow path of the supply unit are shown in FIGS. 3 (a) and 3 (b), respectively.
As shown in FIG. 3A, the coating solution of Test Example 1 maintains transparency. On the other hand, as shown in FIG. 3B, the coating liquid of Test Example 2 is turbid due to the mixing of bubbles. Thus, according to the coating apparatus and the coating method of the said embodiment, it can suppress that a bubble mixes in a coating liquid.

1: coating device,
2: coating roller, 2a: concave portion, 2b: peripheral surface portion,
3: supply part, 3a: chamber, 3b: inflow path, 3c: outflow path, 3d: circulation tank,
4: Filling part, 4a: Plate material for storage,
6: Blade (doctor blade),
A: Coating liquid, B: Object to be coated (sheet member)

Claims (6)

A coating roller for applying a coating liquid to an object to be coated and having a recess on the outer peripheral surface;
A supply section for supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller having a chamber;
While rotating the coating roller, the coating liquid supplied to the recess is brought into contact with the object to be coated, so that the coating liquid is applied to the object to be coated,
Furthermore, a filling portion for filling a coating liquid into the concave portion of the outer peripheral surface of the coating roller after the coating,
The filling unit is configured to expose the coating liquid, and is arranged to fill the concave portion of the outer peripheral surface with the coating liquid before the coating liquid is supplied from the supply unit. Coating equipment.   The coating apparatus according to claim 1, wherein the supply unit is configured to supply the coating liquid to the concave portion of the outer peripheral surface of the coating roller while circulating the coating liquid.   The coating unit according to claim 1, wherein the filling unit is configured to fill the recessed portion of the outer peripheral surface of the coating roller with the stored coating solution while storing the coating solution. apparatus. A coating roller for applying a coating liquid to an object to be coated, and rotating the coating roller having a recess on the outer peripheral surface, and abutting the coating liquid supplied to the recess to the object to be coated A coating step of applying the coating liquid to an object to be coated,
The coating process includes
A supply step of supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller;
A filling step of filling the concave portion of the outer peripheral surface of the coating roller after the coating with a coating liquid,
In the filling step, the coating solution is exposed, and the coating solution is filled in the concave portion of the outer peripheral surface before the coating solution is supplied in the supply step.   5. The coating method according to claim 4, wherein in the supplying step, the coating liquid is supplied to the concave portion of the outer peripheral surface of the coating roller while circulating the coating liquid.   The coating method according to claim 4 or 5, wherein in the filling step, the coating liquid stored while the coating liquid is stored is filled in the concave portion of the outer peripheral surface of the coating roller.