JP3427191B2 - Liquid circulation device of coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid circulation device for a coating device.
, Especially foaming of the coating liquid in the coating liquid recovery tank
The present invention relates to a liquid circulating device of a coating device that can prevent the occurrence of the liquid. [0002] 2. Description of the Related Art Conventionally, a coating liquid is supplied to an object to be coated,
As a liquid circulation device of the coating device that collects excess coating solution,
For example, described in JP-A-3-270760,
A guide member is provided at the falling part of the coating liquid, and the amount of circulating liquid is reduced.
Controlled to reduce (prior art 1), actual opening
Japanese Patent Application Laid-Open No. 60-107952 discloses a coating liquid
A barrier provided in the basin (Prior Art 2).
No. 139875, the coating liquid collecting member is coated.
Arranged so that the cloth liquid flows down, and the coating liquid outlet
Opening on the inner wall adjacent to the bottom of the recovery tank
(Prior art 3), described in Japanese Utility Model Laid-Open No. 1-139876.
The inclined curve below the coating liquid outlet of the coating liquid recovery member
Provided with a member having a surface (prior art 4);
Japanese Patent Application Laid-Open No. 2-57174 discloses a coating liquid recovery tank.
The coating liquid guide tube is spirally inclined in the
The tip of the coating liquid guide tube opens in the coating liquid in the tank.
(Prior Art 5). [0003] However, this is not the case.
In a conventional liquid circulation device of a coating device,
Drop the residual liquid from the liquid recovery color pan to the liquid recovery tank
In order to prevent the formation of bubbles in the liquid collection tank,
Drop the paint in the recovery tank as in Techniques 1, 2 and 4.
A barrier with barriers or a curved plan
By arranging the internal members, the air
Liquid was flowing directly into the collection tank.
Air bubbles can be completely prevented from being trapped by air.
However, it was not sufficient as a measure for preventing the generation of bubbles. [0004] In addition, the coating residual liquid directly flows into the recovery tank.
Recovery as in prior arts 3 and 5 to prevent
Provide an opening in the liquid or check the guide tube of the residual liquid collection section.
Even a device that inclines spirally and prevents the generation of bubbles,
Less foam is generated compared to a device in which residual liquid falls into the collection tank.
No, but we couldn't completely prevent air
Therefore, it is not enough to completely prevent the generation of bubbles.
For this reason, the coating liquid is circulated in a state where bubbles are contained in the liquid,
Such as a decrease in coating quality and a decrease in liquid yield due to foaming.
There was a problem that productivity dropped. [0005] The present invention has been made in view of such conventional problems.
The foaming of the coating liquid in the liquid recovery tank
Complete prevention, resulting in improved coating quality and productivity
To provide a liquid circulation device for the coating device
Aim. [0006] [Means for Solving the Problems]The present invention (Embodiment 1)
Is to supply the coating liquid to the substrate to be coated and collect the excess coating liquid
Repeatedly, from the coating liquid recovery tank to the circulation pump
Of the coating liquid applied to the substrate from the liquid discharge nozzle
Excess residual liquid removed by the volume control device is passed through a color pan.
In the liquid circulation device of the coating device that returns to the liquid collection tank,
Return liquid from the color pan returns to the liquid recovery tankReflux pathWhen
The upper and lower point type level sensors
On-off valve installed in the return piping for excess residual liquid
Is controlled to open and close. [0007]Embodiment 2In addition to the above configuration, the invention of
Set the color pan so that the liquid level is the same as the color pan.
And a sub-color pan connected by a pipe
Upper and lower point type level sensors
On-off valve installed in the return piping for excess residual liquid
Is controlled to open and close. [0008]Embodiment 3The invention according to the above configuration,
Upper and lower point type level assigned to the color pan
Use a continuous level sensor instead of the sensor
Controls the opening and closing of the on-off valve installed in the return pipe
And [0009]Embodiment 4In addition to the above configuration, the invention of
Upper and lower point type lasers installed on the sub-color pan
Use a continuous level sensor instead of the bell sensor
The on-off valve is controlled to open and close. [0010] According to the present invention, a color pan and a sub-color pan,
The space between the return pipe and the liquid recovery tank is always
I have. Therefore, air entrapment may occur during circulation of the coating solution.
Since it does not occur, generation of foaming can be prevented. [0011] DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
I do. 1 to 4 respectively show the present invention.Embodiment1-4
FIG. 2 is a view showing each embodiment of a liquid circulation device of a coating device according to the present invention.
You. In all the drawings for explaining the embodiments, the same
Those having a function are given the same reference numerals, and the description of the repetition is given.
Is omitted. FIG. 1 shows a first embodiment.(Embodiment 1)Coating of description
1 is a schematic configuration diagram of a liquid circulation device of a cloth device, where 1 is a coating liquid.
2 is the substrate to be coated, in the direction indicated by the arrow in the figure
Backing roll 3 from the liquid discharge nozzle 12 side
Move while regulating the amount of application by regulating device 5
It has become. Reference numeral 10 denotes a liquid recovery tank, which is full of the coating liquid 2.
Has been done. 4 is a color pan and 8 is a color pan.
-Installed in the return pipe between the pan 4 and the liquid recovery tank 10
11 is a circulation pump, and
Thus, a coating liquid circulation channel is formed. 6 is color
Upper limit point type level sensor, 7 is lower
Limit point type level sensor connected to the control panel 9.
The on-off valve 8 is controlled to open and close. Move in the direction of the arrow using the above-mentioned coating apparatus.
When the coating liquid 2 is applied to the substrate 1,
From the liquid discharge nozzle 1
The spray coating is performed on the base material 1 from the base 2. Doctor blade, etc.
The excess coating liquid 2 is collected by
It flows into the rapan 4. The liquid level in the color pan 4 is
Control panel when the level of the int type level sensor 6 is reached
The opening and closing valve 8 is opened by the operation of 9 and the coating in the color pan 4 is performed.
The liquid 2 flows down into the liquid recovery tank 10 and gradually becomes a color pan.
The liquid level in 4 drops and the lower limit point type level sensor 7
When the level reaches the level, the on-off valve 8 closes and the color pan 4
The liquid level inside rises again. By repeating the above operation, the color
-The space between the pan 4 and the liquid recovery tank 10 is filled with the coating liquid 2.
And no air is trapped in the middle of the return pipe
As a result, foaming occurs in the coating liquid 2 in the liquid recovery tank 10.
Can be prevented from occurring. FIG.Embodiment 2Liquid circulation equipment
FIG. 2 is a schematic configuration diagram of a device according to claim 1 shown in FIG. 1.
The same liquid level is provided by piping to the color pan 4 of Ming's device
A sub-color pan 14 like
Bell sensor 16, lower limit point type level sensor 17
Are arranged in the sub-color pan 14. As described above, the upper limit point type level sensor
-16, lower limit point type level sensor 17
The color pan of the coating solution 2
Level sensors 16 and 1 based on a change in the inflow state into the
Eliminates adverse effects such as liquid splash on 7 and sudden changes in liquid level
Can be FIG.Embodiment 3Of the coating device of the invention
It is a schematic block diagram of a circulation apparatus, Claim 1 shown in FIG.
Upper limit point type level sensor 6 of the device of the invention described, below
Instead of the limit point type level sensor 7, for example,
Continuous type level sensor such as funnel type, ultrasonic type, laser type
And a color sensor according to the liquid level in the color pan 4.
-Placed in the middle of the return pipe between the pan 4 and the liquid recovery tank 10.
It controls the opening of the opening adjustment valve 18 that is
4 and the liquid recovery tank 10 are filled with the coating liquid 2.
Embraces air in the middle of the return pipe
Without causing foaming of the coating liquid 2 in the liquid recovery tank 10.
Occurrence can be prevented. FIG.Embodiment 4Of the coating device of the invention
FIG. 4 is a schematic configuration diagram of a circulation device, which is shown in FIG.Embodiment 3
The same liquid level by piping to the color pan 4 of the apparatus of the invention
The sub-color pan 14 is arranged so that
The sensor 26 is disposed on the sub color pan 14.
You. Continuous type level sensor 26 for sub color pan 14
By disposing, the flow of the coating liquid 2 into the color pan 4
The liquid level to the continuous level sensor 26 due to the change of the
And can eliminate adverse effects such as sudden changes in liquid level.
You. [0020] 【The invention's effect】The present invention (Embodiment 1)According to the color
The liquid level of the pan is controlled, and the color pan, return piping,
The space between the liquid recovery tanks is always filled with coating liquid
Air is not entrapped during the circulation of the coating solution and bubbles are generated.
Life can be prevented. As a result, coating quality, production
Performance can be improved.Embodiment 2According to the invention of
For example, in addition to the effects of the invention described in claim 1, the color pan
Level sensor based on the change of the inflow state of surplus application residue
Adverse effects such as liquid splash to liquid, rapid change of liquid level, etc.
More complete prevention of foam generation and further improvement of productivity
Can be achieved.Embodiment 3According to the invention of
-Pan liquid level is controlled and color pan and return
The space between the tube and the liquid collection tank is always
Change the inflow speed from the color pan to the liquid collection tank.
Change in the liquid level of the color pan
To prevent the formation of air bubbles
As a result, coating quality and productivity can be further improved
Can be improved.Embodiment 4According to the invention ofReal
Embodiment 3In addition to the effect of the invention of
Fluid level to the level sensor due to changes in the inflow state of coating liquid
And can eliminate adverse effects such as sudden changes in liquid level.
Productivity can be further improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of one embodiment of a liquid circulation device of a coating device according to the present invention (Embodiment 1) . FIG. 2 is a schematic configuration diagram of one embodiment of a liquid circulation device of a coating device according to the invention of Embodiment 2 . FIG. 3 is a schematic configuration diagram of an example of a liquid circulation device of a coating device according to a third embodiment of the invention. FIG. 4 is a schematic configuration diagram of one embodiment of a liquid circulation device of a coating device according to the invention of Embodiment 4 . [Description of Signs] 1 Base material 2 Coating liquid 3 Backing roll 4 Color pan 5 Adhesion amount control device 6,16 Upper limit point type level sensor 7,17 Lower limit point type level sensor 8 Open / close valve 9 Control panel 10 Liquid recovery tank 11 Circulation Pump 12 Liquid discharge nozzle 14 Sub-color pan 26 Continuous level sensor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B05C 5/02 B05C 11/10

Claims (1)

(57) [Claim 1] Supplying a coating liquid to a substrate to be coated and recovering excess coating liquid are performed repeatedly. Surplus residual liquid removed by the coating amount control device for the coating liquid applied to the material,
In the liquid circulation device of the coating device that returns to the collection tank via the color pan, a sub-color pan connected by a color pan and a pipe is arranged so that the liquid level becomes the same as the color pan, and a continuous type is connected to the sub-color pan. A liquid circulation device for a coating liquid, comprising a level sensor, and an on-off valve disposed in a return pipe for surplus liquid.