JP4624519B2 - Coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating apparatus that applies a coating liquid to a substrate, and more particularly, to a coating apparatus that intermittently applies a coating liquid.
[0002]
[Prior art]
As a coating device for applying the coating liquid to the base material, the coating liquid tank, the nozzle for applying the coating liquid to the base material, the coating liquid tank and the nozzle are connected, and a pump and a three-way switching valve are provided. One having a feed line having the same is known. The three-way switching valve and the coating liquid tank are connected by a return line.
[0003]
In such a coating apparatus, the coating liquid in the coating liquid tank is sent along a feed line by a pump. When applying a coating liquid to a base material, a coating liquid is sent to a nozzle side with a three-way switching valve, and a coating liquid is apply | coated to a base material from a nozzle.
[0004]
On the other hand, when the application of the coating liquid is stopped, the coating liquid is returned from the three-way switching valve to the coating liquid tank through a return line.
[0005]
In this way, by the switching action of the three-way switching valve, the coating liquid is fed to the nozzle side through the feed line, and the coating liquid is applied from the three-way switching valve to the coating liquid tank side through the return line. To. In this way, the coating liquid can be intermittently applied to the substrate.
[0006]
[Problems to be solved by the invention]
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 side through the return line. However, even after the application of the coating liquid is stopped, the coating liquid may remain in the nozzle and the coating liquid may leak from the nozzle tip. In this case, the coating liquid outflow from the nozzle cannot be reliably stopped, and it is difficult to reliably control the end of the coating film made of the coating liquid applied to the substrate.
[0007]
The present invention has been made in consideration of such points, and the structure is simple and the coating liquid is intermittently accurate by controlling the end of the coating film composed of the coating liquid applied to the substrate. It aims at providing the coating apparatus which can apply | coat well.
[0008]
[Means for Solving the Problems]
The present invention includes a coating liquid tank that stores a coating liquid, a nozzle that applies 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. A feed line, a return line that connects the three-way selector valve and the coating liquid tank, and a relief line connected to the nozzle. An automatic valve and a relief valve are attached to the relief line sequentially downstream. In addition, a control unit that controls the operation of the three-way switching valve and the automatic valve in synchronization is provided, and the relief valve is a coating device that is opened when the pressure in the nozzle is equal to or higher than a set pressure .
[0009]
The present invention includes a coating liquid tank that stores a coating liquid, a nozzle that applies 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. 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 has an automatic valve, a pressure gauge, and a pressure downstream. successively attaching Rutotomoni an adjusting valve, to synchronize the three-way switching valve and the automatic valve control section for controlling operation provided, open to become pressure regulating valve when the pressure in the nozzle is higher than the set pressure by a signal from the pressure gauge It is the coating device characterized by providing .
[0010]
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. For this reason, when the application of the coating liquid is stopped, the coating liquid in the nozzle does not leak to the substrate side.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a coating apparatus according to the present invention.
[0012]
As shown in FIG. 1, the coating apparatus 10 includes a coating liquid tank 11 that stores a coating liquid 22, a nozzle 12 that applies the coating liquid 22 to a substrate 20 wound around a support cylinder 13, and a coating A feed line 24 that connects the liquid tank 11 and the nozzle 12 is provided, and a pump 14 and a three-way switching valve 15 are attached to the feed line 24.
[0013]
The three-way switching valve 15 and the coating liquid tank 11 are connected by a return line 25. Further, the nozzle 12 has an internal space 12a and a discharge port 12b, and a relief line 26 is connected to the internal space 12a.
[0014]
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.
[0015]
The three-way switching valve 15 and the automatic valve 16 are controlled by the control unit 21 in synchronization. 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 automatic valve 16 is simultaneously closed. When the control unit 21 switches the three-way switching valve 15 to return the coating liquid 22 to the coating liquid tank 11, the automatic valve 16 is opened at the same time.
[0016]
Next, the operation of the present embodiment having such a configuration will be described. First, the support cylinder 13 rotates, and the base material 20 wound around the support cylinder 13 travels in the direction of arrow L in FIG. Next, the pump 14 is operated to pressurize the coating liquid 22 sent from the coating liquid tank 11, and the three-way switching valve 15 and the automatic valve are controlled by the control unit 21.
[0017]
That is, when applying the coating liquid 22 to the base material 20, the automatic valve 16 is closed. Then, the coating liquid 22 pressurized by the pump 14 passes through the three-way switching valve 15, is sent to the nozzle 12 through the feed line 24, and is applied to the surface of the substrate 20 from the discharge port 12 b of the nozzle 12.
[0018]
When stopping the application of the coating liquid 22, the control unit 21 switches the three-way switching valve 15, 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 automatic valve 16 is opened by the control unit 21.
[0019]
Thus, when the three-way switching valve 15 is switched and the coating liquid 22 is returned to the coating tank 11 from the return line 25, the automatic valve 16 is opened at the same time, so that the coating liquid 22 in the internal space 12a of the nozzle 12 is It 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 is discharged. The pressure is discharged outward from the relief valve 17. For this reason, the coating liquid 22 does not leak out from the discharge port 12b of the nozzle 12 to the substrate 20 side. For this reason, it is possible to reliably control the end 22a of the coating film made of the coating liquid 22 applied to the substrate 20, and to prevent the coating film from dragging. As a result, the coating liquid 22 can be intermittently applied to the base material 20 with high accuracy.
[0020]
Thereafter, when the pressure in the internal space 12a of the nozzle 12 decreases, the relief valve 17 is closed and the discharge of the coating liquid 22 is stopped.
[0021]
Thereafter, the three-way switching valve 15 is actuated by the control unit 21, the coating liquid 22 is sent again to the nozzle 12 side, and the automatic valve 16 is closed.
[0022]
Here, the reason why the automatic valve 16 and the relief valve 17 are used as the coating liquid discharge mechanism 18 is as follows. In order to prevent dragging of the coating film at the coating film end portion 22a, it is important to control the pressure in the internal space 12a of the nozzle 12 at the end of coating. For this reason, when only the automatic valve 16 is provided, it is difficult to control the pressure in the internal space 12a 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, when the three-way switching valve 15 is switched and the coating liquid 22 is supplied to the internal space 12a of the nozzle 12, the pressure in the internal space 12a rises and the relief valve 17 opens. Therefore, the coating accuracy may be deteriorated due to pressure fluctuation. From the above, both the automatic valve 16 and the relief valve 17 are provided for discharging the coating liquid.
[0023]
As described above, according to the present embodiment, the coating liquid 22 can be intermittently applied to the base material 20 with a simple structure and easily.
[0024]
Next, another embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 2, instead of providing the relief valve 17 as the discharge mechanism 18, a pressure gauge 28 and a pressure adjusting valve 27 that operates in response to a signal from the pressure gauge 28 are provided.
[0025]
In FIG. 2, other configurations are substantially the same as those of the embodiment shown in FIG. In FIG. 2, the same parts as those of the embodiment shown in FIG.
[0026]
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]
【The invention's effect】
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. There is no leak. For this reason, the coating liquid can be intermittently applied to the substrate 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 a 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 adjustment valve 28 Pressure gauge

Claims (2)

A coating liquid tank for storing the coating liquid;
A nozzle for applying a coating liquid to a substrate;
A connection between the coating liquid tank and the nozzle, and a feed line to which a pump and a three-way switching valve are attached,
A return line connecting the three-way switching valve and the coating liquid tank;
A relief line connected to the nozzle,
The relief line, and an automatic valve toward the downstream side, sequentially attaching Rutotomoni the relief valve, to synchronize the three-way switching valve and the automatic valve control section for controlling operation provided, the relief valve is pressure in the nozzle set pressure or higher A coating apparatus that is opened in the case of . A coating liquid tank for storing the coating liquid;
A nozzle for applying a coating liquid to a substrate;
A connection between the coating liquid tank and the nozzle, and a feed line to which a pump and a three-way switching valve are attached,
A return line connecting the three-way switching valve and the coating liquid tank;
A relief line connected to the nozzle,
The relief line, and an automatic valve toward the downstream side, provided with a pressure gauge, sequentially attaching Rutotomoni a pressure regulating valve, a control unit for controlling operation in synchronization with the three-way switching valve and the automatic valve, a signal from pressure gauge coating apparatus characterized by pressure in the nozzle is provided opening to become pressure regulating valve in the case of more than the set pressure by.

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