JP2713531B2 - Roll coater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a coating liquid such as a photoresist liquid, a polyimide resin or a color filter material to a substrate such as a glass substrate for a photomask or a glass substrate for a liquid crystal display. In order to form a uniform thin film, the coating liquid is supplied from the coating liquid storage section to the outer peripheral surface of the applicator roll, and the applicator roll is rotated on the surface of the substrate which is moved relative to the applicator roll in the horizontal direction. And a roll coater for applying a coating liquid.

[0002]

2. Description of the Related Art In a roll coater as described above, in a stationary state, the coating liquid stored in a coating liquid storage section shifts to a steady state due to local convection or stagnation. For this reason, there has been a problem that the coating liquid is supplied in a state where a ring-shaped pattern is formed on the outer peripheral surface of the applicator roll, and the coating liquid is transferred to the surface of the substrate, causing uneven coating. Therefore, the coating liquid stored in the coating liquid storage unit is appropriately stirred to avoid the above-described coating unevenness.

[0003]

However, depending on the type of the coating liquid, uneven coating may occur due to the ring-shaped pattern if not vigorously stirred. On the other hand, if vigorously stirred, traces of the stirring may be left on the substrate surface. There was a drawback that appeared.

The present invention has been made in view of such circumstances, and controls the operation of the stirring means to satisfactorily stir the coating liquid stored in the coating liquid storage unit to form a ring-shaped pattern. It is an object of the present invention to prevent the occurrence of coating unevenness caused by the application and prevent the adverse effects of the stirring marks from appearing on the substrate surface, thereby enabling the coating liquid to be uniformly applied to the substrate surface.

[0005]

According to a first aspect of the present invention, there is provided a roll coater for supplying a coating liquid to an outer peripheral surface of an applicator roll from a coating liquid storage section, thereby achieving the above object. In a roll coater for applying the coating liquid by rotating the applicator roll on the surface of the substrate moved relative to the applicator roll in the direction, the coating liquid storage unit is provided with a stirring means for stirring the stored coating liquid. A coating liquid supply determining means for determining that the coating liquid to be applied to the substrate is supplied from the coating liquid reservoir to the applicator roll, and the coating liquid to be coated on the substrate by the coating liquid supply determining means And a stirring control means for stopping the stirring operation of the stirring means when it is determined that the water is supplied.

The coating liquid supply determining means includes a substrate placement detecting means for detecting that a substrate is placed on the transport means, as in the roll coater according to the second aspect of the present invention, And substrate removal detection means for detecting that the substrate has been removed, and as stirring control means,
What comprises: a stirring stop means for stopping the stirring operation of the stirring means by the substrate placement detection by the substrate placement detection means; and a stirring start means for stirring the stirring means by the substrate removal detection by the substrate removal detection means. But it is good.

Further, as another application liquid supply determining means,
Rotation speed output means for outputting the rotation speed of the applicator roll, as in the roll coater according to the invention according to claim 3,
A transfer speed output unit that outputs a transfer speed of the transfer unit, a substrate size output unit that outputs a size in the transfer direction of the substrate, a detection of a substrate mounting state by the substrate mounting detection unit, and an output from the rotation speed output unit. The rotation speed of the applicator roll, the transport speed of the transport unit output from the transport speed output unit, and the substrate size output from the substrate size output unit are input to apply the coating liquid to be applied to the substrate. A coating liquid supply timing calculating means for calculating a supply timing supplied from the liquid storage section and a non-supply timing at which the liquid is not supplied, and the stirring control means includes a supply timing calculated by the coating liquid supply timing calculating means. A stirring stop means for stopping the stirring operation of the stirring means; It may constitute and an agitating starting means for performing stirring operation of the stirring means at a timing.

The roll coater according to the present invention is characterized in that
Like the roll coater of the invention according to the present invention, the metal roll is brought into contact with the applicator roll, and a doctor having a step is provided, and the doctor is horizontally approached to the metal roll at an upper position close to the step, and A coating liquid storage section may be formed between the roll and the doctor.

In the roll coater according to the fourth aspect of the present invention, like the roll coater according to the fifth aspect of the present invention, the coating liquid supply determining means is provided with a first rotation speed for outputting the rotation speed of the applicator roll. An output unit, a second rotation speed output unit that outputs a rotation speed of the metal roll, a transfer speed output unit that outputs a transfer speed of the transfer unit, a substrate size output unit that outputs a size in a transfer direction of the substrate, Detection of the substrate placement state by the substrate placement detection means,
The rotation speeds of the applicator roll and the metal roll output from the first and second rotation speed output means, the transfer speed of the transfer means output from the transfer speed output means, and the substrate size output from the substrate size output means And a coating liquid supply timing calculating means for calculating a supply timing at which the coating liquid to be applied to the substrate is supplied from the coating liquid storage section to the metal roll and a non-supply timing at which the coating liquid is not supplied. A stirring control means, a stirring stop means for stopping the stirring operation of the stirring means at the supply timing calculated by the coating liquid supply timing calculating means, and a stirring of the stirring means at the non-supply timing calculated by the coating liquid supply timing calculating means. An agitation starting means for performing the operation may be provided.

[0010]

According to the configuration of the roll coater according to the first aspect of the present invention, the coating liquid stored in the coating liquid storage section is normally stirred by the stirring means to eliminate local convection and stagnation of the coating liquid. To prevent the occurrence of a ring-shaped pattern on the substrate surface, and when the coating liquid to be applied to the substrate is supplied to the applicator roll, the stirring operation of the stirring means is stopped by the stirring control means, and Appearance on the substrate surface can be avoided.

According to the roll coater of the present invention, it takes a predetermined time from when the substrate is placed on the transfer means to when the coating liquid is applied by the applicator roll. In normal times, while stirring the coating liquid stored in the coating liquid storage section with the stirring means, the stirring is performed as the substrate is placed on the transport means for coating the coating liquid. Stop, and after the application of the coating liquid, the stirring is restarted as the substrate is taken out of the transfer means, and the stirring is stopped while the substrate is on the transfer means, and the coating liquid in the stirred state is applied to the substrate surface. Thus, it is possible to avoid the appearance of stirring marks on the substrate surface.

According to the configuration of the roll coater according to the third aspect of the present invention, under normal conditions, the coating liquid stored in the coating liquid storage section is stirred by the stirring means while the substrate to which the coating liquid is coated is formed. According to the size, the application liquid in a state where the stirring is stopped is applied to the portion from the upper end to the lower end in the transfer direction of the substrate surface, so that the trace of the agitation can be prevented from appearing on the substrate surface.

According to the configuration of the roll coater of the invention according to claim 4, when forming a coating film on the outer peripheral surface of the metal roll from the coating liquid storage section and taking it out, an appropriate shear force acts on the step portion. As a result, the coating liquid can be satisfactorily separated from the doctor.

According to the configuration of the roll coater of the invention according to the fifth aspect, in a normal state, the coating liquid stored in the coating liquid storage section is stirred by the stirring means while the substrate on which the coating liquid is coated is formed. Depending on the size, the coating solution that is well separated from the doctor and applied with the stirring stopped is applied to the portion of the substrate surface from the upper end to the lower end in the transfer direction, and the stirring mark is applied to the substrate surface. Appearance can be avoided.

[0015]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is an overall side view showing a first embodiment of a roll coater according to the present invention, FIG. 2 is an overall plan view thereof, and FIG. A substrate transfer stage 2 is provided on the upper portion of the base 1 so as to be capable of reciprocating in the horizontal direction. The base 1 is capable of swinging up and down around a first axis P1 in the horizontal direction on the lower side in the substrate transfer direction. A support frame 3 is provided, and the first axis P
An upper support frame 4 is provided at a location close to 1 so as to be able to swing up and down around a second axis P2 in the horizontal direction.

A metal roll 5 having a smooth peripheral surface and a metal doctor 7 whose peripheral surface is formed in a substantially arc shape by step portions 6 and 6 for shearing the coating liquid are provided on the upper support frame 4 in a horizontal direction. They are arranged side by side so as to be rotatable around the axis.

Outer peripheral surface of metal roll 5 and metal doctor 7
Is brought close to the outer peripheral surface through a predetermined gap,
The gap is adjustable by displacing the metal doctor 7 in the horizontal direction, and the outer peripheral surface of the metal roll 5 and the outer peripheral surface of the metal doctor 7 form the coating liquid storage portion 8 and the coating liquid stored therein. The above-mentioned gap is adjusted according to the viscosity or the like.

The coating liquid storage section 8 is provided with a coating liquid supply nozzle 9 which also serves as a stirring means with its tip penetrating into the coating liquid. Is provided so as to be movable by a rodless cylinder 10 erected in a posture parallel to the above, agitates the application liquid stored in the application liquid storage unit 8 with the movement, and supplies the application liquid to the application liquid storage unit 8 It is configured to be able to.

A scraper 11a and a tray 11b are provided on the lateral side of the metal roll 5, and a residual coating liquid remaining on the outer peripheral surface of the metal roll 5 and a coating liquid not applied to the square substrate W are provided. Is configured to be collected.

A rubber applicator roll 1 having a smooth peripheral surface and elasticity is provided on the upper side of the support frame 3 in the substrate transport direction.
2 is rotatably mounted around the horizontal axis, rotates in the same direction so that the direction of rotation is opposite to the metal roll 5 at the near and near locations, and adheres to the outer peripheral surface of the metal roll 5. The application liquid supplied from the application liquid storage unit 8 is transferred to the applicator roll 12.

A substrate carrying-in device 13 is provided on one side of both ends of the rectangular substrate W in the carrying direction of the base 1, and a substrate carrying-out device 14 is provided on the other side. The substrate carrying-in device 13 and the substrate carrying-out device 14 each include a substrate transport roller 15 for mounting and transporting the rectangular substrate W, and a direction in which the rectangular substrate W is sucked and held by vacuum suction and moved toward and away from the base 1. And a substrate suction arm 16 that can move up and down.

Each of the substrate transport rollers 15...
A flange 17 for regulating the width of the rectangular substrate W in a direction perpendicular to the transport direction is provided.
Stoppers 18, 18 are provided at the rear end in the transport direction,
The rectangular substrate W transported by the substrate transport rollers 15 is maintained in a predetermined posture at the rear end in the transport direction, and the rectangular substrate W is sucked and held by the substrate suction arm 16 and lifted. It is configured to be carried in.

The substrate transfer stage 2 includes a pair of guides 1
9 and 19 and a screw shaft 21 driven and rotated by a servomotor 20 having a zero point detector, a substrate mounting stage 22 as a transport means is provided so as to be movable in the horizontal direction. As shown in the plan view of FIG. 4 and the cross-sectional view of FIG. 5 (cross-sectional view taken along the line AA in FIG. 4), minute suction holes 23 are dispersedly formed on the entire surface, and are arranged in two rows in parallel with the substrate transport direction. Substrate support members 24 having a cylindrical shaft-shaped vacuum suction structure are provided so as to be able to move up and down with respect to the substrate mounting surface in a state of being lined up.

As shown in a side view of FIG. 6 (a cross-sectional view taken along the line BB of FIG. 4), two hollow pipes 25 are provided below the substrate mounting stage 22 so as to be able to move up and down. Each of the hollow pipes 25, 25 has four substrate support members 24.
Are connected integrally with each other in a state where they communicate with each other, and both ends in the longitudinal direction of the two hollow pipes 25, 25 are operatively connected to a crank arm 26, and an air cylinder 27 is operatively connected to the crank arm 26. Thereby, the substrate supporting member 24 is displaced between a substrate receiving position where it protrudes from the substrate mounting surface and receives the square substrate W, and a non-operating position where the substrate supporting member 24 retreats from the substrate mounting surface and does not act on the square substrate W. It is configured.

Teflon (trademark of DuPont), polypropylene,
A cylindrical body 28 formed of a resin material having a large coefficient of friction, such as polyethylene, high-density polyethylene, or rubber, is attached so that the rectangular substrate W can be prevented from slipping when placed.

As shown in FIG. 2, a first capacitance sensor 29 for detecting that the rectangular substrate W is held by vacuum suction is provided at a predetermined position of the substrate suction arm 16 on the substrate loading side. At a predetermined position of the substrate suction arm 16 on the substrate unloading side, a second capacitance sensor 30 is provided as a substrate removal detecting means for detecting that the rectangular substrate W is held by vacuum suction.

Further, as shown in FIG. 4, a third static member as a substrate placement detecting means for detecting that the rectangular substrate W is placed on a predetermined portion of the substrate placement stage 22 and held by vacuum suction. A capacitance sensor 31 is provided.

As shown in the block diagram of FIG. 7, each of the first, second, and third capacitance sensors 29, 30, and 31 is connected to a microcomputer 32 as stirring control means. 32
Is connected to a control valve 33 for the rodless cylinder 10.

The microcomputer 32 is provided with stirring stop means 34 and stirring start means 35. In the stirring stop means 34, the first and third capacitance sensors 2
Based on the detection results of the steps 9 and 31, it is detected that the square substrate W is mounted on the substrate mounting stage 22 from the substrate suction arm 16 of the substrate carry-in device 13, and the control valve 3 is controlled based on the detection.
A stop signal is output to 3 to stop the application liquid supply nozzle 9 from stirring the application liquid stored in the application liquid storage unit 8. Based on the detection result of the second capacitance sensor 30, the agitation starting means 35 determines that the rectangular substrate W has been taken out of the substrate mounting stage 22 and sucked and held by the substrate suction arm 16 of the substrate unloading device 14. Upon detection, a start signal is output to the control valve 33 based on the detection, and the application liquid supply nozzle 9 starts stirring the application liquid stored in the application liquid storage unit 8. The above-described configuration including the first, second, and third capacitance sensors 29, 30, and 31 is referred to as a coating liquid supply determining unit.

(Second Embodiment) As shown in the block diagram of FIG. 8, a third capacitance sensor 31 as a substrate placement detecting means and a rotation speed provided on the applicator roll 12 for detecting the rotation speed are provided. First rotation speed output means 36 for outputting
A second rotational speed output means 37 provided on the metal roll 5 for detecting and outputting the rotational speed thereof; and a square substrate provided on the servomotor 20 for driving the substrate mounting stage 22 based on the pulse interval. The transport speed output means 38 for detecting and outputting the transport speed of W and the substrate size output means 39 for outputting the size of the rectangular substrate W in the transport direction by artificial setting are connected to a microcomputer 40, and A control valve 33 for the rodless cylinder 10 is connected to 40.

The microcomputer 40 is provided with a coating liquid supply timing calculation means 41 and a stirring control means 42, and the stirring control means 42 is provided with a stirring stop means 43 and a stirring start means 44. I have.

In the application liquid supply timing calculating means 41,
As the third capacitance sensor 31 detects that the square substrate W has been mounted on the substrate mounting stage 22, the first capacitance sensor 31
And the rotation speeds of the applicator roll 12 and the metal roll 5 output from the second rotation speed output means 36 and 37, and the transport speed and substrate size output of the substrate mounting stage 22 output from the transport speed output means 38. The substrate size output from the means 39 is input, and a supply timing at which the coating liquid to be applied to the square substrate W is supplied from the coating liquid storage unit 8 to the metal roll 5 and a non-supply timing at which the supply is stopped. Is calculated.

The agitation stop means 43 outputs a stop signal to the control valve 33 at the application liquid supply timing calculated by the application liquid supply timing calculation means 41, and the application liquid supply nozzle 9 controls the inside of the application liquid storage section 8. The stirring of the coating liquid stored in the storage is stopped.

The agitation starting means 44 outputs a start signal to the control valve 33 at the non-supply timing of the coating liquid calculated by the coating liquid supply timing calculating means 41, and the coating liquid supply nozzle 9 causes the coating liquid storage section 8. The agitation of the coating liquid stored therein is started. The above-described third capacitance sensor 31, first and second rotation speed output means 36 and 37, transport speed output means 38, substrate size output means 39, and coating liquid supply timing calculation means 41
And is referred to as a coating liquid supply determining unit.

That is, in the second embodiment, first, the rotation speeds of the applicator roll 12 and the metal roll 5 output from the first and second rotation speed output means 36 and 37 are used to control the application liquid storage section. And the time required for the coating liquid supplied from the transfer roller 8 to be transferred from the metal roll 5 to the applicator roll 12.
And calculating a total time required for the coating liquid transferred to 2 to reach a position vertically below the rotation axis of the applicator roll 12 to be transferred to the surface of the square substrate W, and store the coating liquid. The application liquid arrival time from the unit 8 to the application position on the square substrate W is calculated.

On the other hand, based on the transport speed output from the transport speed output means 38, the distance between the transfer position of the rectangular substrate W from the substrate loading device 13 and the coating position by the applicator roll 12, which is known in advance, is determined. From the relationship, the substrate arrival time at which the edge on the upper side in the transfer direction of the rectangular substrate W mounted on the substrate mounting stage 22 reaches the coating position is calculated.

From the difference between the substrate arrival time and the coating liquid arrival time, after the transfer from the transfer position of the rectangular substrate W is started, the coating liquid to be applied to the rectangular substrate W is transferred from the coating liquid storage section 8 to the metal storage section 8. A time until the state in which the liquid is supplied to the roll 5 is obtained, and a stop signal is output from the stirring stop means 43 to the control valve 33 after the elapse of the time as a supply timing of the coating liquid. The agitation of the coating liquid stored in the coating liquid storage unit 8 is stopped.

Further, from the relationship between the transport speed output from the transport speed output means 38 and the substrate size output from the substrate size output means 39, the lower end of the square substrate W after the start of the coating liquid is obtained. The application time until the application of the coating solution to the edge is completed is determined, and a start signal is output to the control valve 33 by setting the time when the application time has elapsed from the supply timing of the coating solution as the non-supply timing of the coating solution, and The supply nozzle 9 starts stirring the coating liquid stored in the coating liquid storage unit 8.

In the roll coater of the present invention, as in the above-described embodiment, the coating liquid from the coating liquid storage section 8 is applied to the square substrate W through the metal roll 5 and the applicator roll 12.
The present invention is not limited to the type in which the coating liquid is applied to the surface of the rectangular substrate W, and may be applied to the type in which the coating liquid from the coating liquid storage unit 8 is directly applied to the surface of the square substrate W by the applicator roll 12. The configuration may be such that the supply timing and the non-supply timing of the application liquid are calculated without the second rotation speed detecting means 37 in the second embodiment. This configuration corresponds to the roll coater according to the third aspect of the present invention.

The present invention can be applied not only to the roll coater of the above-described embodiment but also to various types of roll coaters such as a roll coater configured to supply a coating liquid by a gravure metal roll.

According to the present invention, the rectangular substrate W
The present invention is not limited to this, and can be applied to a case where a coating liquid is applied to substrates having various shapes.

The present invention is not limited to the coating liquid supply nozzle 9 also serving as stirring means. For example, a dedicated stirring screw shaft is immersed in the coating liquid storage section 8 separately from the coating liquid supply nozzle 9, Various configurations of stirring means, such as a configuration in which the coating liquid in the storage unit 8 is stirred, can be applied.

[0044]

As described above, according to the roll coater according to the first aspect of the present invention, the coating liquid stored in the coating liquid storage section is normally stirred by the stirring means.
Eliminates alteration caused by local convection and stagnation of the coating liquid, prevents the occurrence of ring-shaped patterns on the substrate surface, prevents coating unevenness caused by the ring-shaped patterns, and
When the application liquid to be applied to the substrate is supplied to the applicator roll, the stirring operation of the stirring means is stopped by the stirring control means, and the application liquid which is not adversely affected by the stirring is applied to the substrate surface. The coating liquid can be uniformly applied to the substrate surface by preventing the adverse effects of the trace from appearing on the substrate surface.

According to the roll coater of the second aspect of the present invention, it is determined whether or not the substrate is placed on the transport means for applying the coating liquid, and the substrate is placed on the transport means. While stirring, it is controlled to stop stirring,
A sensor for detecting whether the substrate is placed on the transfer means may be provided, and the sensor and the stirring means may be controlled in cooperation with each other, and with a simple configuration, the application liquid in the stirring state is applied to the substrate surface. It is possible to avoid the appearance of stirring marks on the substrate surface.

According to the roll coater of the third aspect of the present invention, the stirring is stopped only for a necessary minimum according to the size of the substrate on which the coating liquid is to be applied. While avoiding the occurrence of, the appearance of stirring marks on the substrate surface is avoided, and the coating liquid can be satisfactorily applied to the substrate surface.

According to the roll coater of the fourth aspect of the present invention, the coating liquid can be satisfactorily separated from the doctor and a coating film can be formed on the outer peripheral surface of the metal roll and taken out from the coating liquid storage section. In addition, coating unevenness can be eliminated, and the film thickness can be made uniform.

According to the roll coater of the fifth aspect of the present invention, while the film thickness can be made uniform, the stirring is stopped for a minimum time according to the size of the substrate on which the coating liquid is applied. Is performed satisfactorily to prevent the occurrence of a ring-shaped pattern, avoid the appearance of stirring marks on the substrate surface, and apply the coating liquid to the substrate surface more favorably.

[Brief description of the drawings]

FIG. 1 is an overall side view showing a first embodiment of a roll coater according to the present invention.

FIG. 2 is an overall plan view.

FIG. 3 is an enlarged side view of a main part.

FIG. 4 is a plan view of a substrate mounting stage.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a block diagram.

FIG. 8 is a block diagram showing a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 5 ... Metal roll 8 ... Coating liquid storage part 9 ... Coating liquid supply nozzle 12 as stirring means 12 ... Applicator roll 22 ... Substrate mounting stage as transport means 30 ... Second capacitance sensor as substrate removal detecting means 31 a third capacitance sensor as a substrate placement detecting means 32 a microcomputer as a stirring control means 34 a stirring stopping means 35 a stirring starting means 36 a first rotation speed output means 37 a second rotation Speed output means 38 Transport speed output means 39 Substrate size output means 41 Coating liquid supply timing calculation means 42 Stirring control means 43 Stirring stop means 44 Stirring start means W ... Square substrate

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Go Okumura 1 at 480 Takamiya-cho, Hikone City, Shiga Prefecture Dainippon Screen Mfg. Co., Ltd. Hikone District Office (56) References JP-A-62-29877 A)

Claims (5)

(57) [Claims] An applicator roll is supplied with a coating liquid from an application liquid reservoir to an outer peripheral surface of the applicator roll, and the applicator roll is rotated and applied to a surface of a substrate which is moved relatively to the applicator roll in a horizontal direction. In a roll coater for applying a liquid, a stirrer for stirring the stored coating liquid is provided in the coating liquid storage section, and the coating liquid to be applied to the substrate is supplied from the coating liquid storage section to the applicator roll. A coating liquid supply determining means for determining that the application liquid to be applied to the substrate is supplied by the coating liquid supply determining means, and stopping the stirring operation of the stirring means. A roll coater comprising: 2. The method according to claim 1, wherein the application liquid supply determining unit detects that the substrate is mounted on the transfer unit, and the substrate is removed from the transfer unit. Agitation control means, agitation control means, agitation stop means for stopping the agitation operation of the agitation means by substrate placement detection by the substrate placement detection means, and substrate removal detection by the substrate removal detection means And a stirring start means for performing a stirring operation of the stirring means by the roll coater. 3. A substrate placement detecting means for detecting that a substrate is placed on a transport means, and a rotation speed for outputting a rotation speed of an applicator roll. An output unit, a transfer speed output unit that outputs a transfer speed of the transfer unit, a substrate size output unit that outputs a size in a transfer direction of the substrate, a detection of a substrate placement state by the substrate placement detection unit, and the rotation. The rotation speed of the applicator roll output from the speed output means, and each of the transport speed of the transport means output from the transport speed output means and the substrate size output from the substrate size output means, A coating liquid supply tie for calculating a supply timing at which a coating liquid to be applied to the substrate is supplied from the coating liquid storage section and a non-supply timing at which the coating liquid is not supplied. An agitation control unit, wherein the agitation control unit stops the agitation operation of the agitation unit at the supply timing calculated by the application liquid supply timing calculation unit, and the agitation control unit calculates the agitation liquid supply timing calculation unit. A roll coater comprising: a stirring start unit that performs a stirring operation of the stirring unit at a non-supply timing. 4. A doctor provided with a stepped portion by contacting a metal roll with the applicator roll according to claim 1, and a doctor provided with a stepped portion at an upper position close to the stepped portion. A roll coater which is horizontally adjacent to the metal roll and has a coating liquid storage section formed between the metal roll and the doctor. 5. The roll coater according to claim 4, wherein the application liquid supply determining means detects a substrate mounted on the transport means and a rotation speed of the applicator roll. First rotation speed output means for outputting the rotation speed, second rotation speed output means for outputting the rotation speed of the metal roll, transfer speed output means for outputting the transfer speed of the transfer means, and output of the size of the substrate in the transfer direction. Substrate size output means, detection of a substrate placement state by the substrate placement detection means, and rotation speeds of the applicator roll and the metal roll output from the first and second rotation speed output means, respectively. By inputting the transport speed of the transport unit output from the transport speed output unit and the substrate size output from the substrate size output unit, A coating liquid supply timing calculating means for calculating a supply timing at which the coating liquid to be applied to the metal roll is supplied from the coating liquid storage section to the metal roll and a non-supply timing at which the coating liquid is not supplied, wherein the stirring control means comprises: Stirring stop means for stopping the stirring operation of the stirring means at the supply timing calculated by the coating liquid supply timing calculation means; and stirring start for performing the stirring operation of the stirring means at the non-supply timing calculated by the coating liquid supply timing calculation means. Means, and a roll coater comprising: