WO2017163381A1 - Coating device and coating method for coating coating liquid on curved base material - Google Patents

Abstract

A coating device for coating a coating liquid on curved base material is provided with: a storage tank for storing a coating liquid; a slit nozzle for coating the coating liquid onto a curved base material; a supply unit for supplying the coating liquid from the storage tank to the slit nozzle; and a control unit for controlling the coating device. The control unit controls the supply unit such that the supply pressure or supply volume at which the coating liquid is supplied to the slit nozzle is constant, and controls the slit nozzle such that the movement speed of the slit nozzle is inversely proportional to the distance from the tip part of the slit in the slit nozzle to the coating surface on the curved base material.

Description

Coating apparatus and coating method for coating liquid on curved substrate

The present invention relates to a coating apparatus for coating liquid on a curved substrate and a coating method thereof.

In recent years, in the display panel market, etc., there is an increasing demand for single-sided convex glass having a convex curved surface and a flat back surface, and this one-side convex glass is used as the back surface (concave curved surface) of convex curved glass. It is manufactured by applying an adhesive on a flat surface and bonding it to flat glass.

Conventionally, when a coating liquid such as an adhesive is applied to flat glass, a table coater as shown in Patent Document 1 is used. In addition, when applying a coating liquid such as an adhesive to a concave curved surface, it is applied using an arc-shaped nozzle as shown in Patent Document 2, or a concave curved surface as shown in Patent Document 3. There is a method of applying to the uppermost part and leaving the coating solution to move on its concave curved surface by its own weight.

JP 2002-200450 A JP 2004-167422 A JP 2011-256060 A

However, in any of the above methods, it is difficult to apply the coating solution on the concave curved surface so that the upper surface of the applied coating solution is flat.

Therefore, an object of the present invention is to provide a coating liquid coating apparatus and a coating method in which the top surface of the coated coating liquid is flat when the coating liquid is coated on a curved substrate.

The first invention of the present application is:
An apparatus for applying a coating liquid to a curved substrate,
A storage tank for storing the coating liquid;
A slit nozzle for applying the coating liquid to the curved substrate;
A supply unit for supplying the coating liquid from the storage tank to the slit nozzle;
A control unit for controlling the coating device,
The control unit controls the supply unit so as to make the supply pressure of the coating liquid to the slit nozzle constant, and further changes the moving speed of the slit nozzle from the slit tip of the slit nozzle to the curved base material. The slit nozzle is controlled to be inversely proportional to the distance to the coating surface.

According to the above configuration, the slit nozzle is moved so that the moving speed of the slit nozzle is inversely proportional to the distance from the slit tip to the curved base material while the supply pressure of the coating liquid to the slit nozzle is constant. Thus, the coating liquid can be applied to the curved substrate so that the upper surface of the coating liquid is flat.

The second invention of the present application is:
An apparatus for applying a coating liquid to a curved substrate,
A storage tank for storing the coating liquid;
A slit nozzle for applying the coating liquid to the curved substrate;
A supply unit for supplying the coating liquid from the storage tank to the slit nozzle;
A control unit for controlling the coating device,
The control unit controls the supply unit so that a supply amount of the coating liquid to the slit nozzle is constant, and further controls the moving speed of the slit nozzle from the slit tip of the slit nozzle to the curved base material. The slit nozzle is controlled to be inversely proportional to the distance to the coating surface.

According to the above configuration, the slit nozzle is moved so that the moving speed of the slit nozzle is in inverse proportion to the distance from the slit tip to the curved base material while the supply amount of the coating liquid to the slit nozzle is constant. Thus, the coating liquid can be applied to the curved substrate so that the upper surface of the coating liquid is flat.

The first invention and the second invention preferably further comprise the following configuration.
(1) The application surface of the curved base material has a concave curved surface.

According to the configuration (1), by applying an adhesive as a coating liquid to the concave curved surface, the adhesive can be applied so that the upper surface of the adhesive is flat on the concave curved surface. As a result, it becomes easy to bond the convex curved glass and the flat glass, and the one-side convex glass can be easily formed.

The third invention of the present application is:
A method of applying a coating liquid to a curved substrate,
The supply pressure of the coating liquid to the slit nozzle that applies the coating liquid to the curved substrate is constant,
The slit nozzle is moved by making the moving speed of the slit nozzle inversely proportional to the distance from the slit tip of the slit nozzle to the application surface of the curved substrate.

According to the above configuration, by keeping the supply pressure of the coating liquid to the slit nozzle constant, by moving the slit nozzle so as to be inversely proportional to the distance from the slit tip to the curved substrate, the curved substrate is moved. Thus, the coating solution can be applied so that the upper surface of the coating solution is flat.

The fourth invention of the present application is:
A method of applying a coating liquid to a curved substrate,
The supply amount of the coating liquid to the slit nozzle for applying the coating liquid to the curved substrate is constant,
The slit nozzle is moved by making the moving speed of the slit nozzle inversely proportional to the distance from the slit tip of the slit nozzle to the application surface of the curved substrate.

According to the above configuration, with the supply amount of the coating liquid to the slit nozzle being constant, the slit nozzle is moved so as to be inversely proportional to the distance from the slit tip to the curved substrate, thereby making the curved substrate Thus, the coating solution can be applied so that the upper surface of the coating solution is flat.

In short, according to the present invention, it is possible to provide a coating liquid coating apparatus and a coating method in which the top surface of the coated coating liquid is flat when the coating liquid is coated on the curved substrate.

It is the schematic of the coating device which concerns on embodiment of this invention. It is a schematic perspective view of the slit nozzle part vicinity. It is a front schematic diagram of a holding tray. It is a graph which shows the relationship between the distance from the slit front-end | tip part to an application surface with respect to the position of the slit nozzle on a curved-surface base material, the moving speed of a slit nozzle, the discharge amount of a slit nozzle, or discharge pressure. 6 is a graph corresponding to FIG. 4 according to another embodiment. 6 is a graph corresponding to FIG. 4 according to another embodiment.

(overall structure)
FIG. 1 is a schematic view of a coating apparatus 10 according to an embodiment of the present invention. As shown in FIG. 1, the coating apparatus 10 includes a storage tank 1 that stores the coating liquid, a slit nozzle 3 that applies the coating liquid to the curved substrate 11 on the holding tray 2, and a slit nozzle 3 from the storage tank 1. A supply unit 4 for supplying the coating liquid to the coating unit, and a control unit for controlling the coating apparatus 10. The slit nozzle 3 is a slit nozzle for a table coater in which a slit having a predetermined width for discharging the coating liquid is formed in the nozzle itself, and the slit nozzle 3 is moved to apply the coating liquid to the substrate.

High pressure air is supplied to the storage tank 1, and the coating liquid is pushed out from below by the pressure of the high pressure air. The coating liquid in the storage tank 1 can be pushed out by gravity without using high-pressure air.

The storage tank 1 is connected to the supply unit 4 via a two-way valve 12. The supply unit 4 includes a syringe pump 44 driven by a motor 43 and a three-way valve 48. The storage tank 1 is connected to the first supply line 45 via the two-way valve 12, and the first supply line 45 is connected to the syringe pump 44 via the three-way valve 48. The syringe pump 44 is connected to the second supply pipe line 49 via the three-way valve 48. The second supply conduit 49 is connected to the slit nozzle 3. The slit nozzle 3 is movable in the horizontal direction with respect to the holding tray 2 so that a coating film is formed on the curved substrate 11 on the holding tray 2 by the coating liquid applied from the slit nozzle 3. It has become. The control unit controls the supply unit 4, specifically, the operation of the syringe pump 44 driven by the motor 43 and the operation of the three-way valve 48, thereby controlling the slit nozzle 3 from the storage tank 1. The supply pressure and / or supply amount of the coating liquid is controlled.

FIG. 2 is a schematic perspective view of the vicinity of the slit nozzle 3 portion. As shown in FIG. 2, in the slit nozzle 3, a slit that is a discharge port for the coating liquid is formed with a predetermined width in the nozzle movement direction (X direction) of the slit nozzle 3, and the slit direction is orthogonal to the X direction. It is formed to extend to Y. Then, by moving the slit nozzle 3 in the X direction, the coating liquid is applied to the curved substrate 11 on the holding tray 2 with a predetermined width. The control unit can adjust the moving speed of the slit nozzle 3 in the X direction. Specifically, the control unit controls the slit nozzle 3 so that the moving speed in the X direction of the slit nozzle 3 is inversely proportional to the distance D from the slit tip 3a of the slit nozzle 3 to the application surface 11a of the curved substrate 11. Control.

The curved substrate 11 is curved so as to protrude downward so that the upper application surface 11a has a concave curved surface as viewed from the Y direction, and the concave curved surface has a certain curvature. The curved substrate 11 has a configuration in which the concave curved surface extends in the Y direction.

Moreover, it is preferable that the coating liquid applied to the curved substrate 11 has thixotropy. The thixotropy is a property exhibited by an intermediate substance between a plastic solid such as a gel and a non-Newtonian liquid such as a sol, and means a property that the viscosity changes with time. Specifically, when the shear stress is continued, the viscosity gradually decreases and becomes liquid, and when it is stationary, the viscosity gradually increases and finally becomes solid. In the present embodiment, when the coating liquid has thixotropy, when the coating liquid is discharged from the slit nozzle 3, it is liquefied by applying a shear stress, and when the coating liquid is applied to the curved substrate 11, the viscosity gradually increases. Rises and finally becomes solid. In short, it is a liquid that usually has a high viscosity, but the viscosity decreases when pressure is applied and fluidity is improved (in the familiar example, such as paint, ketchup, mayonnaise), and the present invention. When there is a risk that the paint may flow out from a thick part to a thin part, as shown in Fig. It is a suitable liquid in that it is difficult to do.

(Holding tray)
FIG. 3 is a schematic front view of the holding tray 2. As shown in FIG. 2 and FIG. 3, the holding tray 2 that holds the curved substrate 11 is located at one end in the slit direction (Y direction) of the slit nozzle 3 in the nozzle movement direction (X direction) of the slit nozzle 3. The curved base material 11 is disposed between the pair of sandwiching members 21 and 22 in the X direction and is held between the pair of sandwiching members 21 and 22 to hold the curved base material 11 at both ends thereof. Support members 23 and 24 supported from below. Further, the holding tray 2 sandwiches the curved substrate 11 at both ends of the curved substrate 11 in the nozzle movement direction (X direction) of the slit nozzle 3 at the other end of the slit nozzle 3 in the slit direction (Y direction). A pair of sandwiching members 25 and 26, and support members 27 and 28 that are disposed between the pair of sandwiching members 25 and 26 in the X direction and support the curved substrate 11 from below. Yes. The sandwiching member 21 and the support member 23, and the sandwiching member 25 and the support member 27 are provided as a pair at both ends of the curved substrate 11 in the slit direction (Y direction) of the slit nozzle 3. 22 and the support member 24, and the sandwiching member 26 and the support member 28 are provided as a pair at both ends of the curved substrate 11 in the slit direction (Y direction) of the slit nozzle 3.

The clamping member 21 includes a vertical portion 21a extending in the vertical direction and a horizontal portion 21b extending in the horizontal direction from the upper end portion of the vertical portion 21a. Here, in FIG. 3, the length A of the vertical portion 21a, the vertical length B of the slit nozzle 3 and the vertical portion 21a, and the X-direction length C of the slit nozzle 3 (initial position) and the vertical portion 21a. Is constant. Therefore, when the curved base material 11 is sandwiched by the sandwiching member 21, the length A, the length B, and the length C are constant even if the thickness and curvature of the curved base material 11 change. Even if the curvature changes, the initial condition of the operation of the coating apparatus 10 can be made constant. Note that the holding members 21, 22, 25, and 26 have the same height at the lower end of the horizontal portion, that is, the length A of the vertical portion, so that both ends of the curved substrate 11 are held at the same height. Is formed.

The clamping member 22 is arranged in the X direction with respect to the clamping member 21 so that the distance between the clamping members 21 and 22 can be adjusted according to the length of the curved substrate 11 in the nozzle movement direction (X direction). It can move along. Specifically, a ball screw 201 that engages with the clamping member 22 is provided so as to extend inward in the X direction from the X direction end of the table 20, and by rotating the handle 202 at the tip end of the ball screw 201, The clamping member 22 engaged with 201 can move in the X direction. Further, since the holding member 22 and the support member 24 are attached to the upper part of the table 20 and attached to the movable table 203 that can move in the X direction, when the holding member 22 moves in the X direction by the ball screw 201, the movable table 203. Also moves in the X direction, and the support member 24 also moves in the X direction. As a result, the clamping member 22 and the support member 24 move in the X direction as a unit.

Similar to the sandwiching member 22, the sandwiching member 25 can adjust the distance between the sandwiching members 25, 26 according to the length of the curved substrate 11 in the nozzle movement direction (X direction). On the other hand, it is movable along the X direction. The support member 28 moves in the X direction as a unit with the clamping member 26.

The support members 23, 24, 27, and 28 have the same structure. Hereinafter, the support member 23 will be described as an example. The support member 23 includes a support portion 23a that comes into contact with the curved base material 11 at the upper end, and the support portion 23a can be moved up and down by compressed air, electromagnetic force, mechanical structure, or the like. Yes. The top part of the support part 23a has a spherical shape and is made of resin. Further, the support member 23 includes a biasing member 23b that is biased in the vertical direction. The urging member 23b is, for example, a spring and has a buffering function for supporting the curved substrate 11. The urging member 23b is accommodated in the tubular member 23c, and the support portion 23a moves up and down.

The coating device 10 operates as follows.

First, high pressure air is supplied to the storage tank 1 to pressurize it, and the two-way valve 12 is opened. When the three-way valve 48 is set to the suction side and the motor 43 is rotated to the suction side, the coating liquid in the storage tank 1 passes through the first supply pipe 45 and is filled into the syringe pump 44 via the three-way valve 48. The

When the filling of the syringe pump 44 is completed, the three-way valve 48 is switched to the discharge side. When the motor 43 is rotated to the discharge side, the coating liquid in the syringe pump 44 is supplied from the three-way valve 48 to the slit nozzle 3 through the second supply conduit 49. When supplying the application liquid in the syringe pump 44 to the slit nozzle 3, the control unit controls the motor 43 so that the supply pressure or supply amount of the application liquid is constant. Then, the coating liquid is discharged from the discharge port 3b of the slit nozzle 3 to the curved substrate 11 on the holding tray 2 so that the supply pressure or supply amount is constant, and becomes a coating film.

When the controller discharges the coating liquid from the slit nozzle 3 to the curved substrate 11, the controller changes the moving speed (X direction) of the slit nozzle 3 from the slit tip 3 a of the slit nozzle 3 to the coated surface of the curved substrate 11. The slit nozzle 3 is controlled so as to be inversely proportional to the distance. FIG. 4 is a graph showing the relationship between the position of the slit nozzle 3 on the curved substrate 11, the distance from the slit tip 3 a to the coating surface 11 a, the moving speed of the slit nozzle 3, the discharge amount or discharge pressure of the slit nozzle 3. It is. As shown in FIG. 4, the distance D from the slit tip 3 a of the slit nozzle 3 to the application surface 11 a of the curved substrate 11 is the shortest at the X direction base end of the curved substrate 11 and is at the X direction center. It becomes longer toward the center in the X direction, becomes shorter from the center in the X direction toward the tip in the X direction, and becomes shortest at the tip in the X direction. And the distance D from the slit front-end | tip part 3a of the slit nozzle 3 to the application surface of the curved-surface base material 11 becomes the same in a X direction base end part and a X direction front-end | tip part. Therefore, the moving speed of the slit nozzle 3 is the fastest at the base end of the curved surface 11 in the X direction, decreases toward the center in the X direction, and slows down at the center in the X direction. The speed increases toward the tip in the X direction, and is highest at the tip in the X direction. The moving speed of the slit nozzle 3 is the same at the base end portion in the X direction and the front end portion in the X direction. Note that the supply pressure or supply amount of the coating liquid is constant regardless of the position of the slit nozzle 3.

The coating apparatus 10 having the above-described configuration can exhibit the following effects.

(1) In a state where the supply pressure of the coating liquid to the slit nozzle 3 is constant, the moving speed of the slit nozzle 3 is made inversely proportional to the distance D from the slit tip 3a to the coating surface 11a of the curved substrate 11. By moving the slit nozzle 3, the coating liquid can be applied to the curved substrate 11 so that the upper surface of the coating liquid is flat.

(2) In a state where the supply amount of the coating liquid to the slit nozzle 3 is constant, the moving speed of the slit nozzle 3 is made inversely proportional to the distance D from the slit tip 3a to the coating surface 11a of the curved substrate 11. By moving the slit nozzle 3, the coating liquid can be applied to the curved substrate 11 so that the upper surface of the coating liquid is flat.

(3) By applying an adhesive as a coating liquid to the concave curved surface of the curved substrate 11, the adhesive can be applied so that the upper surface of the adhesive is flat on the concave curved surface. As a result, it becomes easy to bond the convex curved glass and the flat glass, and the one-side convex glass can be easily formed.

(4) If the coating liquid has thixotropy, the movement of the coating liquid applied to the curved base 11 can be suppressed, and the coating liquid is applied flatly within a predetermined region of the curved base 11. can do. In addition, when the coating solution has thixotropy, the viscosity of the coating solution after ejection becomes high, and thus when the coating thickness changes during coating as in the case of planar coating on the curved substrate 11. Even if it exists, it is hard to generate | occur | produce that a coating liquid flows from a thick place to a thin place, and thickness does not generate | occur | produce, and the upper surface of a coating liquid can be finished in a suitable plane.

(5) Since the concave curved surface of the curved substrate 11 has a certain curvature, it can be easily achieved to make the moving speed of the slit nozzle 3 inversely proportional to the distance from the slit tip 3a to the curved substrate 11. .

(6) As another coating method when the distance D from the tip 3a of the slit nozzle 3 to the coating surface 11a of the curved substrate 11 continuously changes, the moving speed in the X direction of the slit nozzle 3 is constant. A method of applying the supply pressure or supply amount of the coating liquid in proportion to the distance D can be considered. However, when such a method is performed, the amount of application per unit time changes, and the time taken for the coating solution to volatilize and solidify is not constant (when thickly applied, it takes time to volatilize). Therefore, there is a problem that the uniformity of the quality of the coating solution after solidification on the coating surface 11 of the curved substrate 11 is lacking. On the other hand, in the present invention, since the supply pressure or supply amount of the coating liquid is made constant, the time until the coating liquid is solidified at any time of coating can be made constant, and the quality of the coating liquid after solidification can be improved. The uniformity can be improved as compared with the case where the application pressure or supply amount of the coating liquid is applied in proportion to the distance D.

In the above embodiment, two support members are provided in the nozzle movement direction (X direction), but one or three or more support members may be provided.

In the above embodiment, the sandwiching member and the support member are provided as a pair at both ends of the curved substrate 11 in the slit direction (Y direction) of the slit nozzle 3, but the sandwiching member and the support member are in the Y direction. Three or more may be provided with a predetermined interval.

In the above embodiment, the curved base material 11 has a concave shape having a certain curvature, but the shape of the curved base material 11 is not limited thereto, and for example, as shown in FIG. A curved base material having a convex shape in the middle of the X direction as shown in FIG. 6 may be used.

FIG. 5 shows the distance from the slit tip 3a to the coating surface 11a with respect to the position of the slit nozzle 3 on the curved substrate 11 according to another embodiment, the moving speed of the slit nozzle 3, the discharge amount or discharge of the slit nozzle 3. It is a graph which shows the relationship of a pressure. As shown in FIG. 5, the distance D from the slit tip 3 a of the slit nozzle 3 to the application surface 11 a of the curved substrate 11 is the longest at the X direction base end of the curved substrate 11, and at the center in the X direction. It becomes shorter at the center in the X direction, becomes longer from the center in the X direction toward the tip in the X direction, and becomes the longest at the tip in the X direction. And the distance D from the slit front-end | tip part 3a of the slit nozzle 3 to the application surface of the curved-surface base material 11 becomes the same in a X direction base end part and a X direction front-end | tip part. Therefore, the moving speed of the slit nozzle 3 is the slowest at the base end of the curved surface 11 in the X direction, the speed increases toward the central part in the X direction, and the fastest at the central part in the X direction. The speed decreases toward the tip in the X direction, and becomes the slowest at the tip in the X direction. The moving speed of the slit nozzle 3 is the same at the base end portion in the X direction and the front end portion in the X direction. Note that the supply pressure or supply amount of the coating liquid is constant regardless of the position of the slit nozzle 3.

FIG. 6 shows the distance from the slit tip 3a to the coating surface 11a with respect to the position of the slit nozzle 3 on the curved substrate 11 according to another embodiment, the moving speed of the slit nozzle 3, the discharge amount or the discharge of the slit nozzle 3. It is a graph which shows the relationship of a pressure. As shown in FIG. 6, the distance D from the slit tip 3a of the slit nozzle 3 to the coating surface 11a of the curved substrate 11 increases from the X direction base end of the curved substrate 11 in the X direction, In the middle, it becomes shorter toward the center in the X direction, further becomes longer from the center in the X direction toward the X direction, and becomes shorter toward the tip in the X direction in the middle. The distance D is the same between the base end portion in the X direction and the front end portion in the X direction. Therefore, the moving speed of the slit nozzle 3 decreases from the X direction base end portion of the curved substrate 11 toward the X direction, and increases in the middle toward the X direction center, and further from the X direction center to the X direction. It becomes late toward the X direction, and becomes faster toward the tip in the X direction on the way. Note that the supply pressure or supply amount of the coating liquid is constant regardless of the position of the slit nozzle 3.

Although not shown, in the control in which the moving speed of the slit nozzle 3 is inversely proportional to the distance D from the tip 3a of the slit nozzle 3 to the application surface 11a of the curved substrate 11, the curved substrate 11 is previously provided. If the shape of the slit nozzle 3 is known, the slit nozzle 3 may be controlled by a program corresponding to the shape, and if the curved base material 11 has a different shape, a distance sensor is provided in front of the slit nozzle 3 in the advancing direction. In particular, by measuring the distance D in the forward direction of the slit nozzle 3, the slit nozzle 3 may be moved at a moving speed inversely proportional to the distance D, or other methods may be used.

In the above embodiment, the mechanism for discharging the coating liquid of the supply unit 4 from the slit nozzle 3 is described as changing the discharge amount (supply amount) by pressure as in the syringe pump 44, but the gear pump The supply amount may be changed depending on the number of revolutions as shown in FIG. In the present invention, the supply amount from the slit nozzle 3 is made constant by making these operating pressure and rotation speed constant.

Various modifications and changes can be made without departing from the spirit and scope of the present invention as set forth in the appended claims.

In the present invention, when applying the coating liquid to the curved substrate, it is possible to provide a coating liquid coating apparatus and a coating method in which the top surface of the coated coating liquid is flat. Is big.

DESCRIPTION OF SYMBOLS 1 Storage tank 2 Holding tray 20 Table 201 Ball screw 202 Handle 203 Moving stand 21 Holding member 21a Vertical part 21b Horizontal part 22 Holding member
23 support member 23a support part 23b urging member 24 support member 25 clamping member 26 clamping member 27 support member 28 support member 3 slit nozzle 3a slit tip 3b discharge port 4 supply part 43 motor 44 syringe pump 45 first supply conduit
48 Three-way valve 49 Second supply conduit 10 Application device 11 Curved substrate 11a Application surface 12 Two-way valve D Distance from the tip of slit nozzle to application surface of curved substrate

Claims (5)

An apparatus for applying a coating liquid to a curved substrate,
A storage tank for storing the coating liquid;
A slit nozzle for applying the coating liquid to the curved substrate;
A supply unit for supplying the coating liquid from the storage tank to the slit nozzle;
A control unit for controlling the coating device,
The control unit controls the supply unit so as to make the supply pressure of the coating liquid to the slit nozzle constant, and further changes the moving speed of the slit nozzle from the slit tip of the slit nozzle to the curved base material. The coating device is characterized in that the slit nozzle is controlled to be inversely proportional to the distance to the coating surface.
An apparatus for applying a coating liquid to a curved substrate,
A storage tank for storing the coating liquid;
A slit nozzle for applying the coating liquid to the curved substrate;
A supply unit for supplying the coating liquid from the storage tank to the slit nozzle;
A control unit for controlling the coating device,
The control unit controls the supply unit so that a supply amount of the coating liquid to the slit nozzle is constant, and further controls the moving speed of the slit nozzle from the slit tip of the slit nozzle to the curved base material. The coating device is characterized in that the slit nozzle is controlled to be inversely proportional to the distance to the coating surface.
The coating apparatus of Claim 1 or 2 with which the application surface of the said curved base material has a concave curved surface.
A method of applying a coating liquid to a curved substrate,
The supply pressure of the coating liquid to the slit nozzle that applies the coating liquid to the curved substrate is constant,
The coating method, wherein the slit nozzle is moved in inverse proportion to the distance from the slit tip of the slit nozzle to the coating surface of the curved base material.
A method of applying a coating liquid to a curved substrate,
The supply amount of the coating liquid to the slit nozzle for applying the coating liquid to the curved substrate is constant,
The coating method, wherein the slit nozzle is moved in inverse proportion to the distance from the slit tip of the slit nozzle to the coating surface of the curved base material.

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