JP2001293418A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating device capable of intermittently and precisely applying a coating liquid on a base material. SOLUTION: The coating device 10 is provided with a coating liquid tank 11, a nozzle 12 and a feed line 24, through which the coating liquid tank 11 and the nozzle 12 are connected to each other and to which a pump 14 and a three-way switching valve 15 are attached. The three-way switching valve 15 and the coating liquid tank 14 are connected to each other through a return line 25. A relief line 26 is connected to the nozzle 12, and an automatic valve 16 and a relief valve 17 are attached to the relief line 26. The three-way valve 15 and the relief valve 17 are synchronized and controlled by a control part 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for applying a coating liquid to a substrate, and more particularly to a coating apparatus for applying a coating liquid intermittently.

[0002]

2. Description of the Related Art As a coating apparatus for applying a coating liquid to a substrate, a coating liquid tank, a nozzle for applying the coating liquid to the substrate, a connection between the coating liquid tank and the nozzle, and a pump And a feed line having a three-way switching valve are known. The three-way switching valve and the coating liquid tank are connected by a return line.

In such a coating apparatus, a coating liquid in a coating liquid tank is sent by a pump along a feed line. When applying a coating liquid to a base material, the coating liquid is sent to the nozzle side by a three-way switching valve, and the coating liquid is applied to the base material from the nozzle.

On the other hand, when the application of the coating liquid is stopped, the coating liquid is returned from a three-way switching valve to a coating liquid tank via a return line.

[0005] By the switching action of the three-way switching valve,
The coating liquid is sent to the nozzle side via the feed line to apply the coating liquid to the base material, or the coating liquid is returned from the three-way switching valve to the coating liquid tank via the return line. In this way, the coating liquid can be applied intermittently to the substrate.

[0006]

As described above, when the application of the coating liquid to the substrate is stopped, the coating liquid is returned from the three-way switching valve to the coating liquid tank via the return line. However, even immediately after the application of the coating liquid is stopped, the coating liquid may remain in the nozzle and leak from the tip of the nozzle. In this case, the outflow of the coating liquid from the nozzle cannot be reliably stopped, and it is difficult to reliably control the end of the coating film formed of the coating liquid applied to the base material.

The present invention has been made in view of the above points, and has a simple structure and controls the end of a coating film formed of a coating liquid applied to a base material to intermittently control the coating liquid. It is an object of the present invention to provide a coating apparatus capable of applying a coating with high precision.

[0008]

SUMMARY OF THE INVENTION The present invention provides a coating liquid tank for storing a coating liquid, a nozzle for applying the coating liquid to a substrate, and a connection between the coating liquid tank and the nozzle. A pump and a feed line to which a three-way switching valve is attached, a return line connecting the three-way switching valve and the coating liquid tank, and a relief line connected to the nozzle. The coating device is characterized in that an automatic valve and a relief valve are sequentially mounted.

According to the present invention, there is provided a coating liquid tank for storing a coating liquid, a nozzle for applying the coating liquid to a substrate, a connection between the coating liquid tank and the nozzle, a pump and a three-way switching valve. , A return line connecting the three-way switching valve and the coating liquid tank, and a relief line connected to the nozzle. The relief line has an automatic valve toward the downstream side, and a pressure gauge. And a pressure control valve are sequentially attached, and the pressure control valve is opened and closed by a signal from a pressure gauge.

According to the present invention, by opening the automatic valve, the pressurized coating liquid in the nozzle can be discharged to the outside through the relief line by the relief valve or the pressure regulating valve. Therefore, when the application of the coating liquid is stopped, the coating liquid in the nozzle does not leak to the substrate side.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing one embodiment of a coating apparatus according to the present invention.

As shown in FIG. 1, a coating apparatus 10 includes a coating liquid tank 11 for storing a coating liquid 22 and a nozzle 12 for applying the coating liquid 22 to a base material 20 wound around a support cylinder 13.
And a feed line 24 for connecting between the coating liquid tank 11 and the nozzle 12.
And a three-way switching valve 15.

A return line 25 connects the three-way switching valve 15 and the coating liquid tank 11. Further, the nozzle 12 has an internal space 12a and a discharge port 12b,
A relief line 26 is connected to the internal space 12a.

An automatic valve 16 and a relief valve 17 are sequentially attached to the relief line 26 toward the downstream side, and the automatic valve 16 and the relief valve 17 constitute a discharge mechanism 18.

The operation of the three-way switching valve 15 and the automatic valve 16 is synchronously controlled by the control unit 21. That is, when the control unit 21 operates the three-way switching valve 15 to send the coating liquid 22 to the nozzle 12 side, the control unit 21 simultaneously closes the automatic valve 16. When returning the coating liquid 22 to the coating liquid tank 11 by switching the three-way switching valve 15, the control unit 21 opens the automatic valve 16 at the same time.

Next, the operation of the embodiment having the above-described configuration will be described. First, the support cylinder 13 rotates, and the substrate 20 wound around the support cylinder 13 travels in the direction of arrow L in FIG. Next, the pump 14 is operated and the coating liquid tank 11 is moved.
Pressurizing the coating liquid 22 sent from the
1 controls the three-way switching valve 15 and the automatic valve.

That is, when the coating liquid 22 is applied to the substrate 20, the automatic valve 16 is closed. And pump 1
The coating liquid 22 pressurized by 4 passes through the three-way switching valve 15, is sent to the nozzle 12 via the feed line 24, and is applied to the surface of the base material 20 from the outlet 12 b of the nozzle 12.

When the application of the coating liquid 22 is stopped, the three-way switching valve 15 is switched by the control unit 21, and the coating liquid 22 pressurized by the pump 14 is returned to the coating liquid tank 11 via the return line 25. . At the same time, the control unit 21 controls the automatic valve 1
6 is opened.

When the three-way switching valve 15 is switched to return the coating liquid 22 to the coating liquid from the return line 25, the automatic valve 16 is opened at the same time.
The coating liquid 22 in 2 a is sent to the relief valve 17 through the relief line 26. At this time, if the pressure of the coating liquid 22 in the internal space 12a of the nozzle 12 is equal to or higher than the set pressure of the relief valve 17, the relief valve 17 is opened, and the coating liquid in the internal space 12a of the nozzle 12 Relief valve 17
Is discharged to the outside. Therefore, the discharge port 1 of the nozzle 12
The coating liquid 22 does not leak to the substrate 20 side from 2b. Therefore, the trailing end 22a of the coating film made of the coating liquid 22 applied to the base material 20 can be reliably controlled to prevent the coating film from being dragged. Thereby, the coating liquid 22 can be applied to the substrate 20 with high accuracy and intermittently.

Thereafter, when the pressure in the internal space 12a of the nozzle 12 decreases, the relief valve 17 closes, and the coating liquid 2
Discharge of 2 stops.

Thereafter, the controller 21 controls the three-way switching valve 15
Is operated, the coating liquid 22 is sent to the nozzle 12 again, and the automatic valve 16 is closed.

Here, the reason why the automatic valve 16 and the relief valve 17 are used as the coating liquid discharging mechanism 18 is as follows. It is important to control the pressure in the internal space 12a of the nozzle 12 at the end of coating in order to prevent dragging of the coating film at the coating film end portion 22a. For this reason, when only the automatic valve 16 is provided, it is difficult to control the pressure of the internal space 12 a of the nozzle 12 only by controlling the opening and closing time of the automatic valve 16. When only the relief valve 17 is provided,
The three-way switching valve 15 is switched to change the internal space 12 of the nozzle 12
When the coating liquid 22 is supplied to a, the pressure in the internal space 12a rises and the relief valve 17 is opened, and the coating accuracy may be degraded due to pressure fluctuation. From the above, both the automatic valve 16 and the relief valve 17 are provided for discharging the coating liquid.

As described above, according to the present embodiment, the coating liquid 22 is intermittently and easily applied to the substrate 2 with a simple structure.
0 can be applied.

Next, another embodiment of the present invention will be described with reference to FIG. The embodiment shown in FIG.
Pressure gauge 28 instead of providing the relief valve 17 as
And a pressure regulating valve 27 which is activated by a signal from the pressure gauge 28.

In FIG. 2, the other structure is substantially the same as the embodiment shown in FIG. 2, the same parts as those of the embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 2, since the pressure regulating valve 27 is opened and closed by a signal from the pressure gauge 28, the opening and closing operation of the pressure regulating valve 27 can be performed more accurately.

[0027]

As described above, according to the present invention, when the application of the coating liquid is stopped, the coating liquid in the nozzle can be discharged from the relief line to the outside. The liquid does not leak to the substrate side. Therefore, the coating liquid can be applied to the substrate intermittently with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing an embodiment of a coating apparatus according to the present invention.

FIG. 2 is a schematic system diagram showing another embodiment of the coating apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coating apparatus 11 Coating liquid tank 12 Nozzle 13 Support cylinder 14 Pump 15 Three-way switching valve 16 Automatic valve 17 Relief valve 20 Base material 21 Control part 22 Coating liquid 24 Feed line 25 Return line 26 Relief line 27 Pressure control valve 28 Pressure gauge

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yusuke Ito 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 3J071 AA11 BB02 BB14 BB16 CC13 DD11 EE01 EE24 FF16 4F042 AA22 CB02 CB08 CB20 CC08 CC15

Claims (3)

[Claims] 1. A coating liquid tank for storing a coating liquid, a nozzle for applying the coating liquid to a substrate, a connection between the coating liquid tank and the nozzle, and a pump and a three-way switching valve are mounted. A feed line, a return line connecting the three-way selector valve and the coating liquid tank, and a relief line connected to the nozzle. The relief line is equipped with an automatic valve and a relief valve in order toward the downstream side. A coating device characterized by being attached. 2. A coating liquid tank for storing a coating liquid, a nozzle for applying the coating liquid to a substrate, a connection between the coating liquid tank and the nozzle, and a pump and a three-way switching valve are mounted. A feed line, a return line connecting the three-way switching valve and the coating liquid tank, and a relief line connected to the nozzle. The relief line has an automatic valve toward the downstream side, a pressure gauge, A coating apparatus characterized by sequentially mounting a pressure regulating valve and opening and closing the pressure regulating valve according to a signal from a pressure gauge. 3. The coating apparatus according to claim 1, further comprising a control unit for controlling the operation of the three-way switching valve and the automatic valve in synchronization with each other.