JPH0985153A - Die coater coating material washing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die coater coating material washing device capable of reducing coating material loss at the time of washing pipings and efficiently washing the pipings in a short period of time with a smaller amt. of solvent for washing. SOLUTION: A compressed gas supply piping 232 for supplying a compressed gas is connected to the second coating material piping 12 of a die coater coating material supplying device consisting of a coating material vessel 1, a coating material supplying pump 3, a first coating material piping 2 extended from this coating material vessel and connected to this coating material supplying pump 3 and the second coating material piping 12 extended from the coating material supplying pump 3 and connected to a die coater 16. The device described above is provided with valves 14, 15 for switching the state in which the compressed gas supplied to the second coating material piping 12 flows to the coating material supplying pump 3 side and the state in which the compressed gas flow to the die coater 16 side. A detergent supply piping 28 for supplying a gas-liquid detergent mixture composed of the compressed gas and the detergent is connected to the second coating material piping 12 and a waste liquid tank 35 may be connected to the first coating material piping 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die coater paint cleaning apparatus for supplying paint to a die coater by a paint supply pump.

[0002]

2. Description of the Related Art Conventionally, when a belt-shaped base material is coated by a die coater, a paint container containing a paint, a paint supply pump installed at a position lower than the paint liquid level of the paint container, and a paint supply extending from the paint container. It comprises a first paint pipe connected to the suction side of the pump and a second paint pipe extending from the discharge side of the paint supply pump and connected to the die coater. The paint supply pump supplies the paint in the paint container to the die coater. A die coater paint supply device is used.

[0003] In the case of changing the coating specifications in coating with a die coater, a plurality of paint supply units are usually connected to one die coater, and the coating operation is performed by switching to the supply of paint from another paint supply unit. At the time of this switching, it is necessary to clean the inside of the die coater and also to clean the inside of the pump and piping of the paint supply device used in the previous process in preparation for the next paint supply.
For example, a cleaning solvent, such as a thinner, is flushed through a paint supply pump and first and second paint pipes to wash the inside, and the cleaning solvent containing the paint is discarded.

[0004]

However, the paint pump and the first and second paint pipes after completion of painting are full of paint, and all of this paint has been washed away and discarded, resulting in waste of paint. There was a problem. In addition, it takes time to completely flush the paint filled in the pipes to securely clean the inside, and a large amount of a cleaning solvent is required, so that there is a problem from the viewpoint of environmental pollution prevention.

Accordingly, the present invention has been made to solve the above-mentioned problems, and there is provided a die coater paint cleaning apparatus which can reduce paint loss and can efficiently perform pipe cleaning with a small amount of a cleaning solvent in a short time. The purpose is to provide.

[0006]

In order to achieve the above object, a paint cleaning apparatus for a die coater according to a first aspect of the present invention is provided with a paint container containing paint and a lower position than the paint level of the paint container. And a first paint supply pump extending from the paint container and connected to the suction side of the paint supply pump.
A second paint pipe extending from the discharge side of the paint supply pump and connected to the die coater, wherein the paint supply pump supplies the paint in the paint container to the die coater; A pipe was connected to a compressed gas supply pipe for supplying a compressed gas, and a valve was provided for switching between a state in which the compressed gas supplied to the second paint pipe flows to the paint supply pump side and a state in which the compressed gas flows to the die coater side. (Claim 1).

[0007] In this die coater paint cleaning device, after the paint supply pump is stopped and the painting operation is completed, the valve is switched to a state in which the compressed gas flows to the paint supply pump. When the compressed gas is supplied from the compressed gas supply pipe to the second paint pipe in this state, each of the second paint pipe, the paint supply pump, and the first paint pipe on the paint supply pump side from the connection position of the compressed gas supply pipe. The paint filled inside is pushed by the compressed gas, flows backward, and is returned to the paint container. Subsequently, when the compressed gas is supplied by switching the valve to a state in which the compressed gas flows to the die coater side, the paint filled in the second paint pipe on the die coater side from the connection position of the compressed gas supply pipe and the inside of the die coater is filled with the tip of the die coater. Is pushed out of the slot.

[0008] As described above, according to the die coater paint cleaning device of the first invention, the paint supply pump and the paint filled in the first and second paint pipes are not discarded by using the compressed gas without largely discarding the paint. Since the paint is returned to the container, paint loss can be reduced.Furthermore, if the washing solvent flows after the paint is extruded, the effect of washing the piping and the inside of the die coater is also improved, and the amount of washing solvent used is reduced. We can save.

According to a second aspect of the present invention, in the die coater paint cleaning apparatus of the first aspect, a pipe cleaning pig insertion valve is provided near the connection position of the compressed gas supply pipe of the second paint pipe, and the second paint is inserted through the valve. A paint collection tank for collecting the paint extruded by the pig inserted in the pipe moving in the pipe by the compressed gas is connected to the vicinity of the paint supply pump of the second paint pipe via a valve and a pig catcher. A second compressed gas supply pipe was connected near the paint supply pump of the first paint pipe, and another pipe cleaning pig insertion valve was provided near this connection position, and inserted into the first paint pipe from this valve. The paint return pipe for returning the paint extruded by the pig moving through the pipe by the compressed gas to the paint container is branched from the first paint pipe, and is passed through the valve and the pig catcher. Te which are connected to the paint container (claim 2).

In this die coater paint cleaning apparatus, similarly to the first invention, first, a compressed gas is supplied to the second paint pipe, and the filled paint is caused to flow back to the second paint pipe, the paint supply pump and the first paint pipe. , Return to paint container. Then the second
A pipe cleaning pig is inserted into the paint pipe and is moved in the pipe by a compressed gas to scrape off the paint adhering to the pipe wall and push it out. The scraped paint and the pig flow into a pipe branched from the second paint pipe near the paint supply pump, and the paint passes through a valve and a liquid-permeable pig catcher, and is collected in a paint collection tank. Pigs are collected in pig catchers.

Similarly, for the first paint pipe, the pig is inserted into the first paint pipe, and is moved in the pipe by the compressed gas supplied from the second compressed gas supply pipe. The paint adhering to the pipe wall is pushed out by the movement of the pig, and is collected in the paint container via the paint return pipe, and the pig is collected by the pig catcher on the way.

As described above, according to the die coater paint cleaning apparatus of the second invention, the paint adhered to the pipe wall can be scraped off and collected by the pig, thereby further reducing paint loss and further cleaning. The cleaning effect of the cleaning solvent can be further improved, and as a result, the amount of the cleaning solvent used can be further reduced.

According to a third aspect of the present invention, in the die coater paint cleaning apparatus according to the first or second aspect, the second paint pipe is provided with:
A detergent supply pipe for supplying a gas-liquid mixed detergent of a compressed gas and a cleaning solvent is connected to the compressed gas supply pipe by a valve so as to be selectively communicable, and a second paint is connected from the detergent supply pipe to the second paint. A waste liquid tank for collecting the gas-liquid mixed cleaning agent supplied to the pipe and flowing into the first paint pipe via the paint supply pump is connected to the first paint pipe via a valve.

In this die coater paint cleaning apparatus, after the paint inside the pipe and the paint supply pump is recovered by compressed gas or pig, the valve is operated to connect the detergent supply pipe to the second paint pipe. From this cleaning agent supply pipe,
The cleaning solvent and the compressed gas simultaneously flow out to supply the mixed gas-liquid cleaning agent. Since the paint filled in the pipes and the paint supply pump has been almost completely recovered, the inside of the paint and the paint supply pump is efficiently cleaned by the cleaning agent.
The cleaning agent that has flowed into the first paint pipe from the second paint pipe via the paint supply pump is collected in a waste liquid tank via a pipe and a valve branched from the first paint pipe. Also, the second
By switching the valve provided in the paint pipe and flowing the gas-liquid mixed cleaning agent to the die coater side, the inside of the die coater can be cleaned.

As described above, according to the die coater paint cleaning apparatus of the third invention, the gas and liquid mixed cleaning agent is supplied after the paint inside the pipe and the paint supply pump is recovered by the compressed gas or the pig, thereby cleaning the pipes and the like. Can be performed efficiently in a short time. Also, by supplying a gas-liquid mixed detergent that mixes the compressed gas and the cleaning solvent, pipe cleaning can be performed with a small amount of the cleaning solvent without lowering the cleaning effect compared to the case where only the cleaning solvent is pumped. Becomes possible.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, the compressed gas is represented by compressed air, and the two-dot chain line is a compressed air supply pipe (hereinafter, “pneumatic pipe”) in the drawings.
Say. ).

As shown in FIG. 1, the die coater paint cleaning apparatus according to the first embodiment includes a paint container 1 in which paint is stored. The paint container 1 used for supplying the paint to the die coater 16 usually uses a drum, and in this embodiment, is a hermetic container. A first paint pipe 2 extends from the paint container 1. The first paint pipe 2 has a substantially U-shape, one end of which is located near the bottom of the paint container 1 and the other end thereof is connected to the suction side 3a of the paint supply pump 3. And an on-off valve (hereinafter simply referred to as an on-off valve), a sanitary pipe joint 5, a valve 6, and sanitary pipe joints 7 and 8. A paint return pipe 9 branches from the uppermost horizontal portion of the first paint pipe 2 and extends through a valve 10 to the inside of a gas-liquid separator 11 provided in the paint container 1.

As the paint supply pump 3, a pump having high quantitativeness such as a gear pump is usually used, and is installed at a position lower than the paint liquid level in the paint container 1. One end of a second paint pipe 12 is connected to the discharge side 3 b of the paint supply pump 3, and is connected via a sanitary pipe joint 13 and valves 14 and 15.
The other end is connected to the paint supply port 16a of the die coater 16. A paint supply port 16 is provided inside the die coater 16.
a, and a manifold 16b extending in the width direction of the die coater, and a slot 16c extending from the manifold 16b and opening at the tip of the die coater 16 are formed. Arrow A supported by backup roll 100
It is continuously conveyed in the direction.

The upper part of the paint container 1 is connected to a prime air pressure pipe 231 branched from a compressed air pipe 23 connected to a compressed air supply source 20 and extending through a pressure regulating valve 21 and a three-way valve 22. I have. The three-way valve 22 is
A state in which the ports 221 and 222 are communicated by rotating the valve body 224 provided therein,
223 can be switched to a communication state. The compressed air pipe 231 branches between the three-way valve 22 and the paint container 1 and is provided with a relief valve 25 at the end thereof to prevent an abnormal pressure from acting on the paint container 1 which is an airtight container. Safety is ensured.

The valves 14, 1 provided in the second paint pipe 12
Between the five air pressure pipes 23, a pressure cleaning air pipe 232 branched from the air pressure pipe 23 is connected via a valve 26. The valve 26 is opened and the valves 14 and 15 are opened and closed, whereby the second paint pipe 12 is opened. Can be switched between a state in which the compressed air supplied to the paint supply pump 3 flows and a state in which the compressed air flows to the die coater 16 side.

A cleaning agent supply pipe 28 extending from the mix tank 27 is connected to the second paint pipe 12 at a connection position 17 with the compressed air pipe 232 via a valve 29, and is connected between the second paint pipe 12 and the compressed air pipe 232. The opening and closing operation of the valves 26 and 29 allows the communication with the second paint pipe 12 selectively.
The mix tank 27 is for supplying the gas-liquid mixed cleaning agent mixed by simultaneously flowing the compressed air and the cleaning solvent to the cleaning agent supply pipe 28 to the second paint pipe 12, and an upper portion thereof. , A cleaning agent liquid sending compressed air pipe 23 branched from the compressed air pipe 23 and extending through the pressure regulating valve 30.
3 and a solvent feed pipe 33 extending from the solvent in the cleaning solvent tank 31 and having a valve 32 in the middle.
The cleaning solvent tank 31 is an airtight container, and the upper portion thereof is connected to a solvent supply pressure air pipe 234 branched from the pressure air pipe 23 and extending therefrom.

A first paint pipe 2 is provided in a waste liquid tank 35 provided in parallel with the paint container 1 and having a gas-liquid separator 36 therein.
A waste cleaning agent pipe 38 branched from the above is connected via a valve 37, and the tip thereof extends into the gas-liquid separator 36. The inside of the waste liquid tank 35 can be released to the atmospheric pressure by opening the valve 39.

Next, a description will be given mainly of a paint backflow operation and a pipe washing operation after the coating is completed in the die coater paint washing apparatus having the above configuration. First, the first and second
Open valves 4, 6, 14, and 15 provided in paint pipes 2 and 12,
All other valves are closed, and the three-way valve 22 is set to the state shown in FIG. In this state, the compressed air supply
3. The paint container 1 via the prime operation compressed air pipe 231
When the compressed air is supplied to the
It is pushed out to the paint pipe 2. Then, when the first paint pipe 2 is filled with paint up to the suction side 3a of the paint supply pump 3, the prime operation is completed. Thereafter, the paint supply pump 3 is driven to supply the paint to the die coater 16, and the paint is continuously applied to the belt-shaped substrate W. After the completion of the prime operation, the valve body 224 of the three-way valve 22 is rotated to make the ports 222 and 223 communicate with each other, and the inside of the paint container 1 is released to the atmospheric pressure.

When the driving of the paint supply pump 3 is stopped, the painting operation is completed. At this time, the inside of the die coater 16, the second paint pipe 12, the paint supply pump 3 and the first paint pipe 2 is filled with paint. I have. In this state, the valves 4 and 15 are closed and the valve 10 is set to open, the valve 26 is opened, and compressed air is supplied to the second paint pipe 12 through the pipe cleaning compressed air pipe 232. Thereby, the connection position 1 of the compressed air pipe 232
7, the paint in the second paint pipe 12 on the paint supply pump 3 side is pushed by the compressed air to flow backward, and the paint filled with the paint supply pump 3 and the first paint pipe 2 and the paint through the paint return pipe 9. It is returned to the container 1. Paint container 1
The compressed air that blows out contains fine particles of paint,
Since the compressed air is collected by the gas-liquid separator 11, the paint particles do not scatter outside when the compressed air is exhausted through the compressed air pipe 231 and the three-way valve 22.

Thereafter, the valve 14 is closed and the valve 15 is opened, and the compressed air is flown to the die coater 16 side so that the remaining part of the second paint pipe 12 and the paint inside the die coater 16 are removed from the opening of the slot 16c. Extrude. It is preferable that the connection position 17 of the pipe cleaning compressed air pipe 232 be closer to the die coater 16 in order to increase the amount of paint in the second paint pipe 12 collected in the paint container 1 as much as possible.

As described above, in the die coater paint cleaning apparatus of the present embodiment, the first and second paint pipes 2, 1
2 and a large part of the paint filled in the paint supply pump 3 can be recovered in the paint container 1, so that the paint loss can be reduced as compared with the conventional case where the paint is flushed with a cleaning solvent and discarded. Can be.

After the paint inside the die coater, the piping and the pump is pushed out as described above, the valves 6, 15, and
The valve 26 is closed and the valves 14, 37, and 39 are set to open, and the valve 29 is set to open to connect the cleaning agent supply pipe 28 to the second paint pipe 12. The pressure of the compressed air supplied to the mixing tank 27 via the cleaning agent liquid supply compressed air pipe 233 is supplied to the cleaning solvent tank 31 via the solvent liquid supply compressed air pipe 234 by the pressure regulating valve 30. The pressure is set lower than the compressed air to be used. When the valve 32 is opened in this state, the cleaning solvent is supplied to the mix tank 27 via the solvent feeding pipe 33. The compressed air and the cleaning solvent supplied to the mix tank 27 are simultaneously mixed by flowing out to the cleaning agent supply pipe 28, and are supplied to the second paint pipe 12 as a gas-liquid mixed cleaning agent.

The gas-liquid mixed detergent supplied to the second paint pipe 12 is sent through the pipe while washing the paint adhered to the pipe wall. At this time, if the valve 29 of the cleaning agent supply pipe 28 is rapidly opened and closed in small increments, the pressure fluctuation in the pipe is increased, and the same effect as that for the pulsating operation of the diaphragm pump is generated, and the cleaning effect in the pipe is further enhanced. The gas-liquid mixed detergent flows into the first paint pipe 2 via the paint supply pump 3 while washing, and is collected in the waste liquid tank 35 via the waste detergent pipe 38. Since the gas-liquid separator 36 is also provided inside the waste liquid tank 35, it is possible to prevent the fine particles of the cleaning solvent from scattering to the outside via the valve 39. First and second paint pipes 2, 12
After the end of the cleaning, the valve 14 is closed and the valve 15 is opened.
The remaining portion of the paint pipe 12 and the inside of the die coater 16 are cleaned.

As described above, according to the die coater paint cleaning apparatus of the present embodiment, after recovering most of the paint filled in the first and second paint pipes 2 and 12 and the paint supply pump 3, the gas-liquid mixed detergent , The pipes and the like can be efficiently cleaned in a short time. In addition, by using a gas-liquid mixed cleaning agent in which compressed air and a cleaning solvent are mixed, the cleaning effect is not reduced as compared with the conventional case where only the cleaning solvent is pressure-fed by a dedicated diaphragm pump. The amount of cleaning solvent used can be reduced, which contributes to the prevention of environmental pollution and saves equipment.

As shown by a broken line in FIG. 1, another pipe 42 provided with valves 40 and 41 at both ends is provided with a first paint pipe 2.
And the second paint pipe 12 are connected to be filled with the cleaning liquid, and when the pump 3 is operated, circulation cleaning with the cleaning agent can be performed, and the cleaning effect is improved.

Usually, a plurality of paint supply devices are connected to one die coater 16 in many cases. In this case, the cleaning agent supply pipe 28 is branched and connected to another paint supply device. With the waste tank 3
5 is separated by the sanitary pipe joints 5 and 7 of the first paint pipe 2 and moved to and connected to a paint supply apparatus to be cleaned, so that a plurality of paint supply apparatuses can be handled.

Next, a die coater paint cleaning apparatus according to a second embodiment will be described with reference to FIG. 2. Except for the matters specially described, the apparatus is the same as the first embodiment, and the same members are used. The description is omitted by attaching reference numerals.

A pipe cleaning pig insertion valve 45 is provided in the vicinity of the connection position 17 of the pipe cleaning compressed air pipe 232 to the second paint pipe 12 via a pipe and a sanitary pipe joint 44. In order to facilitate the insertion of the pig into the second paint pipe 12, it is preferable to be on an extension of the second paint pipe 12 extending from the paint supply pump 3 side. Further, a pressure-resistant glass tube 46 is connected to the second paint pipe 12 via two sanitary pipe joints so that the degree of cleaning inside can be visually checked. Further, the second paint pipe 12
Long bend pipes 12a and 12b having large radii of curvature are used in the corners of the above to improve pig passage.

A second extending from the discharge side 3b of the paint supply pump 3 through the sanitary pipe joint 13 and the valve 47.
The paint pipe 12 branches in a T shape, and a pipe extending downward from the paint pipe 12 is connected to a paint recovery tank 51 via a valve 48, a pig catcher 49, and a sanitary pipe joint 50, and a gas-liquid separation provided inside the tank. It extends into the container 52. A valve 53 is connected to the upper part of the paint collection tank 51, and this valve 5
By opening 3, the inside of the tank can be released to the atmospheric pressure. A wire mesh 49a is stretched inside the pig catcher 49 so that the pig is captured but the paint passes.

In this case, a commercially available sponge rubber spine is generally used for the pipe cleaning pig.
It is not limited to this. In addition, 5 to 5
If a pig having an outer diameter of about 10 times is used, both the movement inside the second paint pipe 12 including the long bend pipes 12a and 12b and the scraping of the pipe wall deposits can be performed well. Further, if a pig having a brush attached to the tip is used, the scraping effect is further increased.

On the other hand, the paint supply pump 3 of the first paint pipe 2
In the vicinity of the suction side 3a, a second compressed air pipe 235 branched from the compressed air pipe 23 is connected via a valve 55, and a valve 56 is provided between this connection position and the sanitary pipe joint 8. Another pipe cleaning pig insertion valve 58 is provided near the connection position of the second compressed air pipe 235 and at the tip of a pipe branched from the first paint pipe 2 and having a sanitary pipe joint 57 on the way. Is provided. Further, similarly to the second paint pipe 12, the pressure-resistant glass pipe 59 and the long vent pipes 2a and 2b are connected to the first paint pipe 2.

The paint return pipe 9 branches off from the first paint pipe 2 via a long vent pipe 9a and is connected to the paint container 1 via the valve 10 and the pig catcher 60. Also, the waste cleaning agent pipe 38 has a long vent pipe 38a connected to a corner thereof.
And a pig catcher 61 connected to the waste liquid tank 35.

As the pig insertion valves 45, 58 and the valves 10, 14, 37, 48 through which the pig passes, for example, full port ball valves are preferably used.

In the paint cleaning apparatus of the die coater having the above-mentioned structure, the valves 47 and 56 on both sides of the paint supply pump 3 are opened, and the valves 48 provided on the pipes leading to the paint collection tank 51 are provided.
Valve 53 of paint recovery tank 51 and second compressed air pipe 23
5 is set to closed, and the prime operation of the paint supply pump 3 is performed in the same manner as in the first embodiment.
After the painting work, and after the painting work, collect the paint that fills the pipes.

Thereafter, the valve 26 of the compressed air pipe for cleaning pipe 232 is closed to temporarily stop the supply of compressed air to the second paint pipe 12, and the valves 47 and 56 are closed.
8. Set 53 to open. Then, the pig insertion valve 45 is opened, and the pig is inserted into the second paint pipe 12 from here. The pig is inserted deeper than the connection position 17 of the compressed air pipe 232 by a method such as pushing with a rod, and then the pig is inserted. Valve 45
Close. In this state, when the valve 26 is opened and compressed air is supplied, the pig is pushed by the compressed air and moves downward in the second paint pipe 12 while scraping off the paint adhering to the pipe wall. The scraped paint and the pig are sent to a pipe leading to the paint collection tank 51, and the pig is pig catcher 49.
The paint passes through the pig catcher 49 and is collected in the paint collection tank 51.

Similarly, a pig is inserted from the pig insertion valve 58 into the first paint pipe 2 and the second compressed air pipe 2
The valve 55 is opened to supply compressed air. The pig pressed by the compressed air moves while scraping off the paint adhering to the pipe wall, is sent to the paint return pipe 9, and is collected by the pig catcher 60. The scraped paint passes through the pig catcher 60 and is collected in the paint container 1.

While checking the cleaning state of the inner surfaces of the first and second paint pipes 2 and 12 with the pressure-resistant glass pipes 46 and 59, the paint pipes 2 and 12 may be cleaned a plurality of times by the pig. Thereafter, the valves 26, 48, and 55 are closed and the valves 47 and 56 are set to be open, respectively, and the valve 29 of the detergent supply pipe 28 is opened to supply the gas-liquid mixed detergent to the second paint pipe 12. As in the case of the first embodiment, the interior of each of the paint pipes 2 and 12 and the inside of the paint supply pump 3 are cleaned.

As described above, according to the die coater paint cleaning apparatus of the second embodiment, the same effect as that of the first embodiment can be obtained, and the paint adhered to the inner surface of the pipe is scraped off by the pig. The paint can be collected, and the paint loss can be further reduced. In addition, when a substance having a large specific gravity such as a pigment in the paint is deposited and deposited on the bottom of the pipe at a horizontal portion of the paint pipe, it is difficult to remove the pigment by pushing it out with compressed air alone. Objects can also be reliably removed by pigs. Therefore, by passing the gas-liquid mixed cleaning agent after the pipe is cleaned by the pig, the cleaning operation can be efficiently performed in a short time, and the amount of the cleaning solvent used can be further reduced.

The paint supply pump 3 that cannot be cleaned by the pig can be sufficiently cleaned separately by removing it with the sanitary pipe joints 8 and 13 that can be easily connected and separated, for the same reason. It is preferable to appropriately provide a sanitary pipe joint in the vicinity of the branch of the paint pipe where the pig cannot be cleaned.

If a gas-liquid mixed detergent is passed through each paint pipe 2, 12 before the pig is inserted, the scraping effect of the pig can be improved, and the gas-liquid mixed detergent is used instead of the compressed air. If the pig is moved, the pipe can be washed at the same time as the pig is scraped off.

In the first and second embodiments described above, the present invention is applied to the die coater paint supply device which performs the prime operation of the paint supply pump using compressed air.
The present invention is also applicable to a paint supply device that performs a prime operation of a paint supply pump by a self-priming pump such as a separately provided diaphragm pump. In each of the above embodiments, various changes can be made without departing from the spirit of the present invention. For example, when any of the compressed air or the gas-liquid mixed detergent is supplied to the second paint pipe 12, The switching may be performed by using a multi-way valve having three or more ports in place of the on-off valve, the connection positional relationship with the second paint pipe such as the compressed air pipe 232 and the cleaning agent supply pipe 28, or the compressed air and the cleaning liquid. It is possible to change the method of mixing with the solvent.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a die coater paint cleaning apparatus according to a first embodiment.

FIG. 2 is a schematic configuration diagram of a die coater paint cleaning device according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Paint container, 2 ... 1st paint piping, 3 ... Paint supply pump, 12 ... 2nd paint piping, 14, 15 ... Valve, 16 ... Die coater, 23, 231-235 ... Compressed air supply piping.

Claims (3)

[Claims] 1. A paint container containing a paint, a paint supply pump installed at a position lower than the paint liquid level of the paint container,
A first paint pipe extending from the paint container and connected to the suction side of the paint supply pump; and a second paint pipe extending from the discharge side of the paint supply pump and connected to the die coater. In a die coater paint supply device for supplying a paint to a die coater, a compressed gas supply pipe for supplying a compressed gas is connected to the second paint pipe, and the compressed gas supplied to the second paint pipe is supplied to a paint supply pump side. And a valve for switching between a state of flowing to the die coater side and a state of flowing to the die coater side. 2. A pipe cleaning pig insertion valve is provided in the vicinity of the connection position of the compressed gas supply pipe of the second paint pipe, and the pig inserted into the second paint pipe from this valve moves in the pipe by the compressed gas. A paint collection tank for collecting the extruded paint is connected to the second paint pipe near the paint supply pump via a valve and a pig catcher, and a second compression pipe is connected to the first paint pipe near the paint supply pump. In addition to connecting the gas supply pipe, another pipe cleaning pig insertion valve was provided near this connection position, and the pig inserted into the first paint pipe from this valve was pushed out by moving inside the pipe by the compressed gas. The die according to claim 1, wherein a paint return pipe for returning paint to the paint container is branched from the first paint pipe and connected to the paint container via a valve and a pig catcher. Coater paint cleaning equipment. 3. A detergent supply pipe for supplying a gas-liquid mixed detergent of a compressed gas and a cleaning solvent to the second paint pipe so as to be selectively communicated with the compressed gas supply pipe by a valve. A waste liquid tank is connected to the first paint pipe via a valve for collecting the gas-liquid mixed detergent supplied from the detergent supply pipe to the second paint pipe and flowing into the first paint pipe via the paint supply pump. The die coater paint cleaning device according to claim 1, wherein the paint cleaning device is connected.