JPH0663479A - Roll coater - Google Patents

Abstract

PURPOSE:To uniformly apply a coating solution to the surface of a substrate by preventing that the adverse effect due to a stirring mark appears on the surface of the substrate while preventing the generation of the coating irregularity caused by a ring-shaped pattern by well stirring the coating soln. stored in a coating soln. storage part. CONSTITUTION:First and third electrostatic capacity sensors 29, 31 detect such a state that a square substrate W is placed on a substrate placing stage from a substrate feed-in device and, on the basis of the detection results, a stirring stopping means 34 is operated to stop the stirring of the coating soln. in a coating soln. storage part. A second electrostatic capacity sensor 30 detects such a state that the substrate is taken out to a substrate feed-out means from the substrate placing stage and, on the basis of the detection result, a stirring start means 35 is operated to stirr the coating soln. in the coating soln. storage part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention applies a coating solution such as a photoresist solution, 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 device. In order to form a uniform thin film, the coating liquid is supplied from the coating liquid storage part to the outer peripheral surface of the applicator roll, and the applicator roll is rotated horizontally on the surface of the substrate that is moved relative to the applicator roll. The present invention relates to 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 the coating liquid storage portion moves to a steady state due to local convection or stagnation. As a result, there is 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 to cause coating unevenness. Therefore, the coating liquid stored in the coating liquid storage section is appropriately stirred to avoid the above-mentioned coating unevenness.

[0003]

However, depending on the type of the coating liquid, non-uniform agitation may cause uneven coating due to the ring-shaped pattern. It had the drawback of appearing.

The present invention has been made in view of the above circumstances, and controls the operation of the stirring means to satisfactorily stir the coating liquid stored in the coating liquid storage portion to form a ring-shaped pattern. It is an object of the present invention to prevent the occurrence of coating unevenness due to this and also to prevent the adverse effect of stirring marks from appearing on the substrate surface so that the coating liquid can be uniformly coated on the substrate surface.

[0005]

In order to achieve the above-mentioned object, a roll coater of the invention according to claim 1 supplies a coating liquid from a coating liquid storage portion to an outer peripheral surface of an applicator roll, and horizontally. In a roll coater for applying the coating liquid by rotating the applicator roll on the surface of the substrate that is moved relative to the applicator roll in the direction, the coating liquid storage section is provided with a stirring means for stirring the stored coating liquid. , A coating liquid to be applied to the substrate is provided from the coating liquid reservoir to the applicator roll, and a coating liquid to be applied to the substrate by the coating liquid supply determining unit. It is configured to include a stirring control means for stopping the stirring operation of the stirring means when it is determined that the water is supplied.

As the coating liquid supply determining means, like the roll coater according to the second aspect of the present invention, the substrate placement detecting means for detecting that the substrate is placed on the carrying means, and the carrying means It is composed of a substrate removal detecting means for detecting that the substrate has been removed, and the stirring control means includes:
A configuration including a stirring stop means for stopping the stirring operation of the stirring means by the substrate placement detection means by the substrate placement detection means, and a stirring activation means for performing the stirring operation of the stirring means by the substrate removal detection by the substrate removal detection means. But good.

Further, as another coating liquid supply determining means,
Rotation speed output means for outputting the rotation speed of the applicator roll, such as the roll coater of the invention according to claim 3;
Transport speed output means for outputting the transport speed of the transport means, substrate size output means for outputting the size of the substrate in the transfer direction, detection of the substrate placement state by the substrate placement detection means, and output from the rotation speed output means. Input the rotation speed of the applicator roll, 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 to apply the coating liquid to be applied to the substrate. The coating liquid supply timing calculating means for calculating the supply timing supplied from the liquid storage portion and the non-supply timing not supplied, and the stirring control means is the supply timing calculated by the coating liquid supply timing calculating means. The agitation stopping means for stopping the agitation operation of the agitation means, and the non-compliance calculated by the coating liquid supply timing calculation means. It may constitute and an agitating starting means for performing stirring operation of the stirring means at a timing.

A roll coater according to the present invention is described in claim 4.
Like the roll coater of the invention according to the invention, a 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, A coating liquid storage part may be formed between the roll and the doctor.

In the roll coater of the invention according to claim 4, as in the roll coater of the invention according to claim 5, the coating liquid supply determining means outputs a first rotation speed for outputting the rotation speed of the applicator roll. Output means, 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 substrate size output means for outputting the size of the substrate in the transfer direction, Detection of the substrate mounting state by the substrate mounting detection means,
Each of 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 supply timing for supplying the coating liquid to be applied to the substrate from the coating liquid storage unit to the metal roll and a non-supply timing at which the coating liquid is not supplied. A stirring control 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 the stirring means at the non-supply timing calculated by the coating liquid supply timing calculation means It may be configured to include a stirring start-up means for performing an operation.

[0010]

According to the structure of the roll coater of the first aspect of the present invention, in a normal state, the coating liquid stored in the coating liquid storage section is agitated by the agitating means to eliminate local convection and stagnation of the coating liquid. To prevent the formation of a ring-shaped pattern on the surface of the substrate, and when the coating liquid to be coated on the substrate is supplied to the applicator roll, the stirring control unit stops the stirring operation of the stirring unit, and the trace of stirring is left. Appearance on the substrate surface can be avoided.

According to the structure of the roll coater of the second aspect of the present invention, it takes a predetermined time from when the substrate is placed on the transfer means until the coating liquid is applied by the applicator roll. Paying attention to this fact, in normal times, while the coating liquid stored in the coating liquid storage section is being stirred by the stirring means, the stirring is performed as the substrate is placed on the transfer means for coating the coating liquid. After the coating liquid is applied, the agitation is restarted as the substrate is taken out from the transporting means, the agitation is stopped while the substrate is on the transporting means, and the agitated coating liquid is applied to the substrate surface. Therefore, it is possible to prevent the stirring trace from appearing on the substrate surface.

Further, according to the structure of the roll coater of the third aspect of the present invention, in a normal state, while the coating liquid stored in the coating liquid storage portion is stirred by the stirring means, the substrate to be coated with the coating liquid is Depending on the size, it is possible to prevent the stirring trace from appearing on the surface of the substrate by applying the coating liquid in a state where stirring is stopped to a portion of the surface of the substrate from the end on the upper side to the end on the lower side in the transfer direction.

According to the roll coater of the invention as defined in claim 4, when the coating film is formed on the outer peripheral surface of the metal roll and taken out from the coating liquid storage portion, an appropriate shearing force acts on the step portion. Thus, the coating liquid can be well separated from the doctor.

Further, according to the structure of the roll coater of the fifth aspect of the invention, in a normal state, the coating liquid stored in the coating liquid storage portion is stirred by the stirring means while the substrate to which the coating liquid is applied is coated. Depending on the size, the coating liquid that is well separated from the doctor and is in a state where stirring is stopped is applied to the area from the upper end to the lower end of the substrate surface in the transfer direction, and the agitation marks are on the substrate surface. You can avoid appearing.

[0015]

Embodiments of the present invention will now 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. 3 is an enlarged side view of essential parts. A substrate transfer stage 2 is provided on the upper part of the base 1 so as to be capable of reciprocating in the horizontal direction, and the base 1 is vertically swingable around a horizontal first axis P1 on the lower side of the substrate transfer direction. A support frame 3 is provided, and the support frame 3 is provided with the first axis P.
An upper support frame 4 is provided at a position close to 1 so as to be vertically swingable around a second axis P2 in the horizontal direction.

On the upper support frame 4, a metal roll 5 made of a metal having a smooth peripheral surface and a metal doctor 7 having a peripheral surface formed in a substantially arc shape by the step portions 6 and 6 for shearing the coating liquid are arranged in a horizontal direction. They are arranged side by side so that they can rotate around their axes.

The outer peripheral surface of the metal roll 5 and the metal doctor 7
The outer peripheral surface of the is approached through a predetermined gap,
The gap can be adjusted 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 a coating liquid storage portion 8 and the coating liquid stored therein. It is configured to adjust the above-mentioned gap according to the viscosity and the like.

The coating liquid reservoir 8 is provided with a coating liquid supply nozzle 9 which also serves as a stirring means in a state where its tip penetrates into the coating liquid, and the coating liquid supply nozzle 9 extends in the longitudinal direction of the metal roll 5. It is movably provided by a rodless cylinder 10 installed in a posture parallel to the above, and the coating liquid stored in the coating liquid storage portion 8 is stirred along with the movement, and the coating liquid is supplied to the coating liquid storage portion 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 the residual coating liquid remaining on the outer peripheral surface of the metal roll 5 and the coating liquid not coated on the rectangular substrate W are provided. Is configured to recover.

An applicator roll 1 made of rubber having a smooth peripheral surface and elasticity at a position on the upper side of the support frame 3 in the substrate carrying direction.
2 is rotatably mounted around a horizontal axis, rotates toward the metal roll 5 in the same direction so that the rotation direction is opposite to that of the metal roll 5 and is attached to the outer peripheral surface of the metal roll 5. The coating liquid supplied from the coating liquid storage section 8 is transferred to the applicator roll 12.

A substrate loading device 13 is provided on one side of both ends of the rectangular substrate W in the transport direction of the base 1, and a substrate unloading device 14 is provided on the other side thereof. Each of the substrate loading device 13 and the substrate unloading device 14 is a direction in which the rectangular substrate W is placed and transported, and the rectangular substrate W is sucked and held by vacuum suction to approach the base 1. And a substrate suction arm 16 that is movable up and down.

Substrate transport roller 15 ...
A brim 17 for restricting the width of the rectangular substrate W in the direction orthogonal to the transport direction is additionally provided, while in the substrate loading device 13,
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 suction-held by the substrate suction arm 16 and lifted, and then the substrate is transferred to the substrate transport stage 2. It is configured to be loaded.

The substrate transfer stage 2 comprises a pair of guides 1.
9, 19 and a screw shaft 21 driven and rotated by a servo motor 20 having a zero point detector are provided with a substrate mounting stage 22 as a transfer means 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 (the cross-sectional view taken along the line AA of FIG. 4), the minute suction holes 23 are dispersedly formed on the entire surface, and the two rows are arranged in parallel with the substrate transfer direction. Substrate supporting members 24 having a cylindrical shaft-like vacuum suction structure in a lined state are provided so as to be able to move back and forth with respect to the substrate mounting surface by raising and lowering.

Below the substrate mounting stage 22, as shown in the side view of FIG. 6 (a sectional view taken along the line BB in FIG. 4), two hollow pipes 25, 25 are vertically movable. Each of the hollow pipes 25, 25 has four substrate support members 24.
Are integrally attached in a state of communicating with each other, both longitudinal ends of both hollow pipes 25, 25 are interlockingly connected to a crank arm 26, and an air cylinder 27 is interlockingly connected to the crank arm 26, so that the air cylinder 27 can expand and contract. Thus, the substrate support member 24 is displaced between a substrate receiving position that projects from the substrate mounting surface to receive the rectangular substrate W and a non-acting position that retracts from the substrate mounting surface and does not act on the rectangular substrate W. It is configured.

On the opening end side of the vacuum suction hole of the substrate support member 24, Teflon (trademark of DuPont), polypropylene,
A cylindrical body 28 formed of a resin material having a large friction coefficient such as polyethylene, high-density polyethylene, or rubber is attached to the rectangular substrate W so that the rectangular substrate W can be prevented from slipping during mounting.

As shown in FIG. 2, a first electrostatic capacity sensor 29 for detecting that the rectangular substrate W is vacuum-sucked and held is attached to a predetermined position of the substrate suction arm 16 on the substrate loading side. A second electrostatic capacitance sensor 30 is attached to a predetermined position of the substrate suction arm 16 on the substrate unloading side as a substrate extraction detection unit that detects that the rectangular substrate W is vacuum suction-held.

Further, as shown in FIG. 4, a third substrate as a substrate placement detecting means for detecting that the rectangular substrate W is placed at a predetermined position on the substrate placing stage 22 and held by vacuum suction. A capacitance sensor 31 is attached.

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 a stirring control means, and the microcomputer thereof is also connected. 32
A control valve 33 for the rodless cylinder 10 is connected to the.

The microcomputer 32 is provided with an agitation stopping means 34 and an agitation starting means 35. In the stirring stop means 34, the first and third capacitance sensors 2
Based on the detection results of 9 and 31, it is detected that the rectangular substrate W is placed on the substrate placing stage 22 from the substrate suction arm 16 of the substrate carry-in device 13, and based on that, the control valve 3
A stop signal is output to 3 to stop the stirring of the coating liquid stored in the coating liquid storage section 8 by the coating liquid supply nozzle 9. In the stirring starter 35, based on the detection result of the second capacitance sensor 30, it is confirmed that the rectangular substrate W is taken out from the substrate mounting stage 22 and sucked and held by the substrate suction arm 16 of the substrate carry-out device 14. The detection is performed, and the start signal is output to the control valve 33 based on the detection, and the coating liquid supply nozzle 9 starts stirring the coating liquid stored in the coating liquid storage section 8. The above-mentioned configuration including the first, second, and third capacitance sensors 29, 30, and 31 is referred to as a coating liquid supply determination unit.

(Second Embodiment) As shown in the block diagram of FIG. 8, a third capacitance sensor 31 as a substrate placement detecting means and an applicator roll 12 are provided to detect the rotation speed thereof. First rotation speed output means 36 for outputting
And a second rotation speed output means 37 provided on the metal roll 5 for detecting and outputting the rotation speed thereof, and a servo motor 20 for driving the substrate mounting stage 22. A transfer speed output means 38 for detecting and outputting the transfer speed of W and a substrate size output means 39 for outputting the size of the rectangular substrate W in the transfer direction by artificial setting are connected to a microcomputer 40, respectively. 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 stopping means 43 and a stirring starting means 44. There is.

In the coating liquid supply timing calculation means 41,
As the third capacitance sensor 31 detects that the rectangular substrate W is placed on the substrate placement stage 22, the first
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 transfer speed and the substrate size output of the substrate mounting stage 22 output from the transfer speed output means 38. By inputting each of the substrate sizes output from the means 39, the supply timing at which the coating liquid to be coated on the rectangular substrate W is supplied from the coating liquid storage section 8 to the metal roll 5, and the non-supply timing at which the coating liquid is not supplied. Is calculated.

The agitation stopping means 43 outputs a stop signal to the control valve 33 at the coating liquid supply timing calculated by the coating liquid supply timing calculating means 41 so that the coating liquid storage nozzle 8 is operated by the coating liquid supply nozzle 9. The stirring of the coating liquid stored in is stopped.

The agitation starting means 44 outputs a starting 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 so that the coating liquid storage section 8 is operated by the coating liquid supply nozzle 9. The stirring of the coating liquid stored inside is started. The third capacitance sensor 31, the first and second rotation speed output means 36 and 37, the transfer speed output means 38, the substrate size output means 39, and the coating liquid supply timing calculation means 41 described above.
It is constituted by and is referred to as a coating liquid supply determining means.

That is, in the second embodiment, first, the coating liquid storage section is controlled by the respective 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. The time required for the coating liquid supplied from 8 to be transferred from the metal roll 5 to the applicator roll 12, and the applicator roll 1
The total time taken for the coating liquid transferred to No. 2 to reach the position vertically below the rotation axis of the applicator roll 12 to be transferred to the surface of the rectangular substrate W is calculated, and the coating liquid is stored. The time required for the coating liquid to reach the coating position on the rectangular substrate W from the portion 8 is calculated.

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

Due to 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 supplied from the coating liquid storage section 8 to the metal. The time until the state of being supplied to the roll 5 is obtained, and after the lapse of the time, the agitation stopping means 43 outputs a stop signal to the control valve 33 so that the coating liquid supply nozzle 9 causes The stirring of the coating liquid stored in the coating liquid storage section 8 is stopped.

From the relationship between the transport speed output from the above-described transport speed output means 38 and the substrate size output from the substrate size output means 39, the lower edge of the rectangular substrate W after the coating liquid is started. The application time until the application liquid is completely applied to the edge is obtained, and when the application time has elapsed from the application liquid supply timing, the start time signal is output to the control valve 33, and the application liquid is output. The supply nozzle 9 starts agitating the coating liquid stored in the coating liquid storage section 8.

As the roll coater of the present invention, as in the above-mentioned embodiment, the rectangular substrate W is obtained by applying the coating liquid from the coating liquid storage section 8 through the metal roll 5 and the applicator roll 12.
The present invention is not limited to the type in which the surface of the rectangular substrate W is directly applied to the surface of the rectangular substrate W by the applicator roll 12 without being limited to the type in which it is applied to the surface of the rectangular substrate W. The supply timing and the non-supply timing of the coating liquid may be calculated without the second rotation speed detecting means 37 in the second embodiment. This configuration corresponds to the roll coater of the invention according to claim 3.

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

According to the present invention, the rectangular substrate W as described above is used.
However, the present invention is not limited to this and can be applied to the case where the coating liquid is applied to substrates of various shapes.

The present invention is not limited to the coating liquid supply nozzle 9 which also serves as a 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 to form the coating liquid. Agitating means having various configurations, such as a configuration in which the coating liquid in the reservoir 8 is agitated, can be applied.

[0044]

As described above, according to the roll coater of the first aspect of the invention, the coating solution stored in the coating solution storage section is normally stirred by the stirring means.
Prevents the occurrence of ring-shaped patterns on the substrate surface by eliminating the alteration caused by local convection and stagnation of the coating liquid, and prevents the occurrence of coating unevenness caused by the ring-shaped patterns, and
When the coating liquid to be applied to the substrate is supplied to the applicator roll, the stirring operation of the stirring unit is stopped by the stirring control unit, and the coating liquid that is not adversely affected by stirring is coated on the substrate surface. The coating liquid can be evenly applied to the surface of the substrate while preventing the adverse effect of traces from appearing on the surface of the substrate.

Further, 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 controls to stop stirring,
A sensor for detecting whether or not 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. With a simple configuration, the coating liquid in the stirred state is applied to the substrate surface. It is possible to prevent the stirring trace from appearing on the substrate surface.

According to the roll coater of the third aspect of the present invention, the stirring is stopped for a minimum necessary period according to the size of the substrate on which the coating liquid is applied. It is possible to prevent the occurrence of stirring traces on the surface of the substrate while preventing the occurrence of, and to satisfactorily apply the coating liquid to the surface of the substrate.

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

According to the roll coater of the fifth aspect of the invention, while the film thickness can be made uniform, the stirring is stopped for a necessary minimum amount depending on the size of the substrate to which the coating liquid is applied. The coating liquid can be more favorably applied to the substrate surface while avoiding the appearance of stirring marks on the substrate surface while preventing the occurrence of ring-shaped patterns.

[Brief description of 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.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a block diagram.

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

[Explanation of symbols]

5 ... Metal Roll 8 ... Coating Liquid Reservoir 9 ... Coating Liquid Supply Nozzle as Stirring Means 12 ... Applicator Roll 22 ... Substrate Placement Stage 30 as Transfer Means 30 ... Second Capacitance Sensor as Substrate Ejection Detection Means 31 ... Third capacitance sensor as substrate placement detecting means 32 ... Microcomputer as stirring control means 34 ... Stirring stopping means 35 ... Stirring starting means 36 ... First rotation speed output means 37 ... 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

Claims (5)

[Claims] 1. An application liquid is supplied from an application liquid storage part to the outer peripheral surface of an applicator roll, and the applicator roll is applied to the surface of a substrate which is horizontally moved relative to the applicator roll. In a roll coater for applying a liquid, the coating liquid storage unit is provided with a stirring means for stirring the stored coating liquid, and the coating liquid to be applied to the substrate is supplied from the coating liquid storage unit to the applicator roll. The coating liquid supply determining means for determining that the coating liquid is to be applied is provided, and the stirring operation of the stirring means is stopped as the coating liquid supply determining means determines that the coating liquid to be applied to the substrate is supplied. A roll coater characterized by being provided with a stirring control means for controlling. 2. The coating liquid supply determining means according to claim 1, wherein the substrate placement detecting means detects that the substrate is placed on the carrying means, and the substrate is taken out from the carrying means. And a substrate removal detection means for detecting the substrate removal detection means, wherein the stirring control means stops the stirring operation of the stirring means by the substrate placement detection by the substrate placement detection means, and the substrate removal detection by the substrate removal detection means. A roll coater comprising: a stirring start-up means for performing a stirring operation of the stirring means. 3. The coating liquid supply determining means according to claim 1, the substrate placement detecting means for detecting that the substrate is placed on the transporting means, and the rotation speed for outputting the rotation speed of the applicator roll. Output means, transfer speed output means for outputting the transfer speed of the transfer means, substrate size output means for outputting the size of the substrate in the transfer direction, detection of the substrate mounting state by the substrate mounting detection means, and rotation of the substrate By inputting the rotation speed of the applicator roll output from the 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, respectively, A coating liquid supply tie for calculating a supply timing and a non-supply timing at which the coating liquid to be applied to the substrate is supplied from the coating liquid storage section. And 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 the stirring control means calculates by the coating liquid supply timing calculating means. A roll coater comprising: a stirring start-up means for stirring the stirring means at a non-supply timing. 4. The applicator roll according to claim 1, a metal roll is brought into contact with the applicator roll, and a doctor provided with a step portion is provided, and the doctor is provided at an upper position close to the step portion. A roll coater horizontally adjacent to the metal roll and having a coating liquid reservoir formed between the metal roll and the doctor. 5. The roll coater according to claim 4, wherein the coating liquid supply determining means detects the substrate placement detecting means for detecting that the substrate is placed on the carrying means, and the rotation speed of the applicator roll. First rotation speed output means for outputting, second rotation speed output means for outputting rotation speed of the metal roll, transfer speed output means for outputting transfer speed of the transfer means, and size in the transfer direction of the substrate are output. Substrate size output means, detection of the 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. 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 are respectively input, and the substrate is output. The coating liquid to be applied to the metal roll from the coating liquid storage unit is supplied to the metal roll and a non-supplying timing for calculating the non-supply timing, and the stirring control unit, A 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 a 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 A roll coater equipped with means and.