JP6844838B2 - Coating liquid circulation supply device - Google Patents

Description

The present invention relates to a coating liquid circulation supply device attached to a coating device for applying a coating liquid such as a printing device or a coating device.

Generally, the coating device is provided with a plate cylinder (roll) for transferring the coating liquid such as ink, coating liquid, adhesive liquid, and paint to the web, and a chamber for supplying the coating liquid to the roll. In order to circulate and supply the coating liquid to the chamber, the coating device is provided with a coating liquid circulation supply device composed of a liquid feeding pipe, a liquid return pipe, a pump, a storage tank, and the like.

For example, Patent Document 1 discloses a gravure coating device (double chamber type) in which two liquid pools for supplying a coating liquid to a gravure roll are formed in a chamber. Since a large number of cells (dents) are formed on the peripheral surface of the gravure roll, air bubbles are mixed in each liquid pool of the chamber at the time of coating. When applied to the web with a coating liquid containing air bubbles, the coating quality deteriorates, such as the occurrence of spots. Therefore, the coating liquid mixed with air bubbles is returned to the storage tank through the liquid return pipe, and the coating liquid from which the air bubbles have been removed is circulated and supplied to the liquid pool again.

Normally, the tip of the return pipe inserted into the storage tank prevents air bubbles from entering the coating liquid in the storage tank and avoids pressure fluctuations through the coating liquid in the liquid return pipe to the liquid pool in the chamber. Therefore, it is placed above the liquid surface so that it is open to the atmosphere. However, in such a case, there is a problem that air is entrained in the coating liquid in the storage tank due to the force of the coating liquid flowing down from the return liquid pipe. In particular, a coating liquid having a high viscosity such as an adhesive liquid has a strong tendency to cause air entrainment when the liquid level drops.

Therefore, in the coating device of Patent Document 2, an opening that is inclined and opened over a predetermined height range is provided at the tip of the liquid return pipe, and the liquid level of the coating liquid is controlled within the predetermined height range. ing.

Further, Patent Document 3 discloses a defoaming device that removes air bubbles mixed in the liquid resin, although it is not related to the coating liquid circulation supply device.

The defoaming device includes a pump 110, a buffer tank 120, a filter unit 130, and the like, and is arranged in the middle of a piping path 3 for supplying liquid resin from the liquid resin tank 4 to the discharge nozzle 5. The filter portion 130 is composed of a cylindrical filter main body 140 made of a metal mesh and a holding frame 150 mounted in the buffer tank 120 to support the filter main body 140.

The holding frame 150 has a bottom plate 155 that inclines and expands between the lower end of the filter main body 140 and the liquid level, and the liquid resin sent to the buffer tank 120 by the pump 110 passes through the filter main body 140. , It is configured to fall on the bottom plate 155, adhere to the inner wall of the buffer tank 120 along the upper surface thereof, and flow down onto the liquid surface.

Japanese Unexamined Patent Publication No. 2012-170835 Japanese Unexamined Patent Publication No. 2000-84453 Japanese Unexamined Patent Publication No. 2013-23346

When the coating device is in operation, the level of the coating liquid accumulated in the storage tank fluctuates.

With the use of the coating liquid in the coating device, the amount of the coating liquid accumulated in the storage tank gradually decreases. Therefore, when the coating liquid is manually replenished, the liquid level of the coating liquid accumulated in the storage tank is lowered until the coating liquid is newly replenished. As the liquid level drops, the falling distance of the coating liquid increases, and air is more likely to be entrained.

Even when the coating liquid is replenished by automatic control, the liquid level of the coating liquid accumulated in the storage tank fluctuates. Therefore, if the tip of the return pipe is placed sufficiently away from the fluctuating liquid surface so that it will not be immersed when the amount of coating liquid increases, the falling distance of the coating liquid becomes large and air is likely to be entrained. .. Further, if the fluctuation of the liquid level is large, air is likely to be entrained particularly when the liquid level drops.

Therefore, in the coating device of Patent Document 2, the tip of the liquid return pipe is arranged near the liquid level and a sensor for detecting the liquid level is provided so that the vertical movement of the liquid level can be controlled to be small. The liquid level of the coating liquid is controlled based on this. Similarly, the defoaming device of Patent Document 3 proposes that the liquid level of the liquid resin accumulated in the buffer tank is controlled by a sensor so that the bottom plate is located near the liquid level.

However, in order to stably control the vertical movement of the liquid level to a small extent, advanced sensors, control devices, control software, etc. are required, which complicates the device and increases the cost.

In addition, if the flow rate of the coating liquid is small, the momentum of the coating liquid flowing down from the return pipe is weak and the vertical movement of the liquid level is gentle, so that the liquid level can be easily controlled and a good bubble removing effect can be easily obtained. .. However, in order to eliminate air bubbles from the liquid pool in the chamber, it is preferable that the flow rate of the coating liquid is large, so that the flow rate of the coating liquid is generally large.

When the flow rate of the coating liquid is high, the momentum of the coating liquid flowing down from the return pipe becomes strong, and it is easy for air to be entrained. In addition, the coating liquid mixed with air bubbles reaches the bottom of the storage tank and coats the inside of the storage tank. The liquid is agitated. Therefore, a good bubble removing effect may not be obtained. Since the vertical movement of the liquid level becomes intense, the control of the liquid level tends to be unstable.

In particular, in a double chamber type coating device as in Patent Document 1, a large amount of bubbles tend to be generated in one of the liquid pools. Therefore, if the coating liquid containing a large amount of bubbles is mixed in the storage tank, the coating liquid containing the bubbles is supplied to both liquid pools again, which causes deterioration of the coating quality.

Therefore, an object of the present invention is to provide a coating liquid circulation supply device capable of effectively suppressing the mixing of air bubbles into the coating liquid in the storage tank while having an extremely simple configuration.

The present invention relates to a coating liquid circulation supply device that circulates and supplies a coating liquid to the coating device. The coating liquid circulation supply device includes a storage tank for storing the coating liquid with a space left above the liquid surface, a liquid feeding path for transferring the coating liquid from the storage tank to the coating device, and the coating device. The storage tank is provided with a return route for collecting the coating liquid. Inside the storage tank, a lower end portion is placed on the bottom surface of the storage tank, and a liquid feeding structure is provided to feed the coating liquid to the liquid feeding path through a communication port formed at the lower end portion. .. The liquid return path has an outlet for flowing out the coating liquid in the space of the storage tank. Further, below the outlet, a flow impact mitigation structure is provided that receives the coating liquid flowing out from the outlet while floating on the liquid surface and diffuses it to the liquid surface.

That is, according to this coating liquid circulation supply device, a flow-down impact mitigation structure that receives the coating liquid flowing out from the outlet and diffuses it to the liquid surface is provided below the outlet located in the space above the storage tank. Therefore, it is possible to absorb and mitigate the impact of the flowing coating liquid. Then, since the received coating liquid is diffused on the liquid surface, air bubbles mixed in the coating liquid can be effectively removed through these processes.

Further, since the flow-down impact mitigation structure floats on the liquid surface, the impact applied to the flow-down impact mitigation structure can be efficiently absorbed and relaxed through the liquid surface. As a result, the entrainment of air is suppressed, and it is also possible to prevent the coating liquid mixed with air bubbles from reaching the bottom of the storage tank and stirring the coating liquid. Since the flow impact mitigation structure floats on the liquid surface, it is not affected by changes in the liquid level.

The downflow impact mitigation structure has a float that receives the coating liquid flowing out from the outflow port on the upper surface, and the float can be configured to be arranged below the outflow port in a state in which the float can be raised and lowered. ..

According to this configuration, since it is an extremely simple structure, a flow-down impact mitigation structure can be realized at low cost, which is practical.

Further, the flow-down impact mitigation structure has a flexible mesh bag that receives the coating liquid flowing out from the outlet, and the mesh bag is suspended so that the lower end portion is immersed in the coating liquid. It can also be configured to be located below.

Since this configuration is also an extremely simple structure, a flow impact mitigation structure can be realized at low cost.

In particular, in this case, the amount of the coating liquid flowing out from the outlet is set so that the liquid level of the coating liquid collected inside the mesh bag is higher than the liquid level of the coating liquid stored in the storage tank. , It is preferable to adjust the amount of the coating liquid flowing out from the mesh bag.

By doing so, it is possible to diffuse the coating liquid accumulated in the storage tank without any trouble while appropriately alleviating the impact of the coating liquid flowing down.

The above-mentioned coating liquid circulation supply device is particularly suitable for a gravure coating device. Specifically, the coating device includes a gravure roll and a chamber for supplying the coating liquid to the gravure roll, and the chamber supplies the coating liquid to the upstream region of the rotating gravure roll. It has an upstream side chamber and a downstream side chamber for supplying the coating liquid to the downstream side region thereof, and the liquid return path is to apply the coating liquid from both the upstream side chamber and the downstream side chamber to the storage tank shared by these. In addition to collecting, the liquid feeding route is effective when the coating liquid is transferred from the storage tank to both the upstream side chamber and the downstream side chamber.

According to the coating liquid circulation supply device of the present invention, it is possible to effectively suppress the mixing of air bubbles into the coating liquid in the storage tank with an extremely simple configuration.

It is a schematic diagram showing a coating apparatus and a coating liquid circulating supply system mounted thereto in implementation form. It is a schematic diagram showing details of a reservoir in the implementation form. It is the schematic which shows the detail (state where the liquid level is low) of the storage tank in a reference form. It is the schematic which shows the detail (state where the liquid level is high) of the storage tank in a reference form. It is explanatory drawing when the flow-down impact mitigation structure is not provided (comparative example).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is essentially merely an example and does not limit the present invention, its application or its use.

<Implementation form>
Figure 1 shows the implementation of the form, the annexed coating apparatus 1 and to a coating liquid circulating supply device 2. The coating device 1 is provided with a backup roll 10, a gravure roll 20, a chamber 30, and the like, and the coating liquid circulation supply device 2 is provided with a storage tank 40, a liquid feeding path 50, a liquid returning path 60, and the like. There is.

(Applying device)
In FIG. 1, reference numeral W is a base material to be coated, and the base material W is conveyed at a constant speed in a predetermined direction (from bottom to top in FIG. 1) at the time of coating. The gravure roll 20 is rotationally driven in the direction opposite to the transport direction of the base material W, and cooperates with the rotatably supported backup roll 10 to sandwich the base material W to be transported. By doing so, the gravure roll 20 pressed against the base material W continuously applies the coating liquid supplied from the chamber 30 to the base material W.

The chamber 30 is composed of a chamber body 31, a doctor blade 32, a seal blade 33, an inner blade 34, a pair of side plates (not shown), and the like. The chamber body 31 is made of a case-shaped member extending along the gravure roll 20, and has a horizontally long recess 31a on a surface facing the gravure roll 20.

A horizontally long doctor blade 32 is attached to the end of the chamber body 31 on the upper side of the recess 31a (downstream in the rotation direction of the gravure roll 20). A horizontally long seal blade 33 is attached to the end of the chamber body 31 on the lower side of the recess 31a (upstream side in the rotation direction of the gravure roll 20). A horizontally long inner blade 34 is attached to the upper and lower intermediate portions of the recess 31a.

The tips of the doctor blade 32 and the seal blade 33 are pressed against the peripheral surface of the gravure roll 20. Both ends of the recess 31a in the longitudinal direction are closed by side plates (not shown). As a result, a closed horizontally long space (liquid pool) in contact with the peripheral surface of the gravure roll 20 is formed between the gravure roll 20 and the chamber main body 31.

Further, in this coating device 1, the tip of the inner blade 34 is pressed against the peripheral surface of the gravure roll 20, so that the liquid pool is located in the upstream region in the rotation direction with respect to the peripheral surface of the rotating gravure roll 20. It is divided into an upstream side chamber 35 in contact with the downstream side chamber 35 and a downstream side chamber 36 in contact with the downstream side region in the rotation direction thereof. Therefore, of the peripheral surface of the gravure roll 20 in contact with the liquid pool, the coating liquid is supplied from the upstream side chamber 35 in the upstream side region thereof, and the coating liquid is supplied from the downstream side chamber 36 in the downstream side region. ing.

In order to circulate and supply the coating liquid to each of the upstream side chamber 35 and the downstream side chamber 36, the chamber main body 31 has an upstream side introduction port 35a communicating with the lower part of the upstream side chamber 35 and an upstream side communicating with the upper part of the upstream side chamber 35. Each of the outlet 35b, the downstream introduction port 36a communicating with the lower part of the downstream chamber 36, and the downstream outlet 36b communicating with the upper part of the downstream chamber 36 are formed. Then, the coating liquid is circulated and supplied to the upstream chamber 35 through the upstream inlet 35a and the upstream outlet 35b by the coating liquid circulation supply device 2, and the downstream chamber 36 is circulated through the downstream inlet 36a and the downstream outlet 36b. The coating liquid is circulated and supplied to the container.

The gravure roll 20 brings air bubbles into the liquid pool. Therefore, air bubbles are intensively mixed in the upstream side chamber 35 located on the upstream side, and more air bubbles are accumulated in the upstream side chamber 35 than in the downstream side chamber 36. In order to effectively remove air bubbles from the downstream concubine 36, it is preferable that the amount of circulation of the coating liquid is large.

(Liquid circulation supply device)
As shown in FIG. 1, in the present embodiment, the coating liquid is collected from both the upstream side chamber 35 and the downstream side chamber 36 into one storage tank 40 shared by the liquid return path 60, and the coating liquid is collected by the liquid feeding path 50. , The coating liquid is transferred from the storage tank 40 to both the upstream side chamber 35 and the downstream side chamber 36.

The liquid feed path 50 is composed of pipes, hoses, etc., and has an upstream branch introduction path 51 connected to the upstream introduction port 35a, a downstream branch introduction path 52 connected to the downstream introduction port 36a, and a downstream branch introduction path 52. It is composed of a main introduction path 53 that extends to the storage tank 40 in connection with the upstream branch introduction path 51 and the downstream branch introduction path 52. The liquid return path 60 is also composed of pipes, hoses, etc., and has an upstream branch lead-out path 61 connected to the upstream outlet 35b, a downstream branch lead-out path 62 connected to the downstream lead-out port 36b, and a downstream branch lead-out path 62. It is composed of a main lead-out path 63 that is connected to the upstream branch lead-out path 61 and the downstream branch lead-out path 62 and extends to the storage tank 40.

FIG. 2 shows the details of the storage tank 40 of the present embodiment. The storage tank 40 is provided with a tank body 41 made of a box-shaped container having an opening on the upper surface, and a lid 42 that can be opened and closed to cover the opening on the upper surface of the tank body 41. The storage tank 40 is set to a size capable of storing an appropriate amount of coating liquid with a margin with respect to the amount used in the coating device 1. That is, the size is set so that when a sufficient amount of the coating liquid is put into the storage tank 40, a space remains on the storage tank 40. In FIG. 2, the liquid level S at the low level (shown by the solid line) and the liquid level Sh at the highest level (the liquid level at the upper limit of the liquid level) are illustrated by virtual lines.

Inside the storage tank 40, a liquid feeding structure 70 is provided to send out the coating liquid while suppressing the mixing of air bubbles.

The liquid feeding structure 70 includes a bubble guard 71, a support member 72, a centrifugal pump 73, and the like. The bubble guard 71 is made of a cylindrical member, and the lower end thereof is placed on the bottom surface of the storage tank 40. A communication port 71a is formed in an arc shape on the peripheral wall at the lower end of the bubble guard 71 so that the coating liquid flows into the inside of the bubble guard 71 through the communication port 71a.

The support member 72 has a support frame 72a attached to the upper end of the bubble guard 71, and a support rod 72b fixed to the support frame 72a and extending downward along the center line of the bubble guard 71. The centrifugal pump 73 is supported by the tip of the support rod 72b and is arranged below the inside of the bubble guard 71. A relay pipe 73a extending vertically inside the bubble guard 71 is connected to the discharge port of the centrifugal pump 73.

An upstream end 54 of the liquid feeding path 50 is inserted into the storage tank 40 from the opening on the upper surface of the storage tank 40. The relay pipe 73a is connected to the upstream end 54 of the liquid feeding path 50.

The downstream end 64 of the liquid return path 60 is also inserted into the storage tank 40 through the opening on the upper surface of the storage tank 40. The outlet 65, which opens at the downstream end 64 of the liquid return path 60 and allows the coating liquid to flow out, is arranged in a space above the liquid level Sh at the upper limit so as not to be immersed in the coating liquid. There is.

A flow-down impact mitigation structure 80 is also provided inside the storage tank 40.

The flow-down impact mitigation structure 80 has a function of receiving the coating liquid flowing out from the outlet 65 while floating on the liquid surface S and diffusing it to the liquid surface S, and is arranged below the outlet 65. The flow-down impact mitigation structure 80 of the present embodiment is composed of a float 81, an elevating guide 82, and the like.

The float 81 is made of a lightweight, low-density plate-shaped member such as polyethylene foam, which floats on the liquid surface S of the coating liquid and does not sink.

The elevating guide 82 is composed of a plurality of rod-shaped members fixed to the bottom surface of the storage tank 40. These rod-shaped members are arranged so as to surround the float 81 and extend in parallel upward. As a result, the float 81 can be moved up and down in the vertical direction, but cannot move in the horizontal direction to the outside of a predetermined range below the outlet 65, and the liquid of the coating liquid is below the outlet 65. It shifts up and down as the position fluctuates.

By providing such a flow-down impact mitigation structure 80, it is possible to promote the removal of air bubbles mixed in the coating liquid collected in the storage tank 40, and alleviate the impact of the collected coating liquid when flowing down. Therefore, it is possible to suppress the mixing of air bubbles into the coating liquid accumulated in the storage tank 40.

The bubbles mixed in the coating liquid accumulated in the storage tank 40 gradually rise due to the buoyancy. Therefore, if the coating liquid is not agitated, the bubbles gradually rise from the bottom of the coating liquid and are removed. Then, the bottom coating liquid from which the bubbles have been removed flows into the inside of the bubble guard 71 through the communication port 71a, and is sent by the centrifugal pump 73 through the liquid return path 60.

However, as shown in FIG. 4, when such a flow-down impact mitigation structure 80 is not provided, the coating liquid is consumed by the coating device 1 and the amount of the coating liquid accumulated in the storage tank 40 is reduced. When the liquid level drops, the coating liquid flowing down from the outlet 65 flows into the coating liquid accumulated in the storage tank 40 with a strong force. Then, the coating liquid mixed with air bubbles reaches the bottom of the storage tank 40 while further entraining air, and the coating liquid collected in the storage tank 40 is agitated, so that the coating liquid mixed with air bubbles flows into the upstream side chamber 35 and the downstream side chamber 35. It will be supplied to both of 36.

In particular, the larger the circulation amount of the coating liquid, the stronger the momentum of the coating liquid flowing down from the outlet 65, so that the influence becomes greater. As a result, the amount of air bubbles in both the upstream side chamber 35 and the downstream side chamber 36 increases, so that the amount of circulation of the coating liquid is increased in an attempt to remove air bubbles from both the upstream side chamber 35 and the downstream side chamber 36. Then, the momentum of the coating liquid flowing down from the outlet 65 becomes stronger, and the coating liquid having a large amount of bubbles is supplied to both the upstream side chamber 35 and the downstream side chamber 36, resulting in a vicious cycle.

On the other hand, when the flow-down impact mitigation structure 80 as shown in FIG. 2 is provided, the coating liquid flowing down from the outflow port 65 is received by the upper surface of the float 81, so that the impact is absorbed and mitigated. Since the float 81 floats on the liquid surface S, the impact applied to the float 81 is also efficiently absorbed and mitigated through the liquid surface S. As a result, the entrainment of air is suppressed, and it is also possible to prevent the coating liquid mixed with air bubbles from reaching the bottom of the storage tank 40 and stirring the coating liquid.

The coating liquid received by the float 81 flows down to the liquid surface S along the upper surface of the float 81 and is diffused to the liquid surface S. Bubbles mixed in the coating liquid can be effectively removed through these processes. Moreover, since the float 81 is suspended on the liquid surface S, it is not affected by the change in the liquid level. Since it does not require a sensor or the like and has an extremely simple structure, it can be realized at low cost and is practical.

< Reference form>
3A and 3B show the main part (storage tank 40') of the coating liquid circulation supply device 2 of the reference form. Like coating apparatus 1, the basic structure is the same as the implementation form, the description for the same construction by the same reference numerals will be omitted.

In reservoir 40 'of the shape state, flows down cushioning structure 80 is different from the coating liquid circulating supply device 2 of the first embodiment. That is, the flow impact mitigation structure 80 of the present embodiment is composed of a flexible mesh bag 85.

The mesh bag 85 is made by processing a flexible thin cloth-like sheet having a mesh (mesh) of a predetermined size over the entire area into a vertically long bag shape, so that the outlet 65 is located above the inside of the mesh bag 85. , The opening portion is bound to the end portion 64 on the downstream side of the liquid return path 60. As a result, the mesh bag 85 is suspended from the downstream end 64 of the return path 60 and is arranged below the outlet 65.

The mesh bag 85 has a lower end portion even when the liquid level S of the coating liquid accumulated in the storage tank 40'reaches the lower limit (at least above the centrifugal pump 73 and is usually managed above it). Is set so that it can be immersed in the coating liquid (at least it enters below the liquid level S). As a result, the lower end portion of the mesh bag 85 in which the coating liquid is collected can float on the liquid surface S of the coating liquid in a state where a part thereof is sunk.

All the coating liquid flowing down from the outlet 65 is received by the mesh bag 85 and then flows out through the mesh. At this time, the outflow of the coating liquid from the outlet 65 is such that the liquid level of the coating liquid collected in the mesh bag 85 is higher than the liquid level S of the coating liquid stored in the storage tank 40'. The amount and the outflow amount of the coating liquid from the mesh bag 85 are adjusted.

That is, the mesh size of the mesh bag 85 is selected according to the circulation amount of the coating liquid so that the coating liquid appropriately collects inside the mesh bag 85. The state in which the coating liquid is appropriately accumulated in the mesh bag 85 is at least a state in which the coating liquid hardly accumulates in the mesh bag 85 and passes through, or a space is created inside the mesh bag 85 when the coating liquid is full in the mesh bag 85. Except for the state where the bag is lost, the coating liquid is collected in the lower part of the mesh bag 85, and a space exists above the coating liquid.

By doing so, it is possible to diffuse the coating liquid accumulated in the storage tank 40'without any trouble while appropriately alleviating the flow impact of the coating liquid.

As shown in FIG. 3A, when the liquid level S is low, the coating liquid is appropriately accumulated in the mesh bag 85, so that the mesh bag 85 is vertically long and the lower end portion is swollen. The lower end of the mesh bag 85 in which the coating liquid is collected floats on the liquid surface S in a state where a part of the lower end portion is immersed in the coating liquid. The coating liquid flowing down from the outlet 65 is received by the coating liquid collected in the mesh bag 85 and the mesh bag 85 to alleviate its momentum, so that the coating liquid collected in the storage tank 40'is almost subject to the impact. Absent.

The coating liquid collected in the mesh bag 85 flows out through the mesh due to the pushing action due to its own weight. Since the coating liquid flows out through the mesh (pores), air bubbles mixed in the coating liquid can be effectively removed. Further, since the coating liquid exudes from a wide area at the lower end of the mesh bag 85 and gently diffuses to the liquid surface S, there is no possibility of stirring the coating liquid accumulated in the storage tank 40'.

Even if the liquid level S becomes high, as shown in FIG. 3B, the lower end portion of the mesh bag 85 is only in a more horizontal bulging state and floats while being immersed in the liquid level S. Therefore, the coating liquid flowing down from the outlet 65 is received by the coating liquid accumulated inside the mesh bag 85 and the mesh bag 85 to alleviate its momentum, so that the coating liquid accumulated in the storage tank 40'has an impact. I rarely receive it.

By flowing out of the coating liquid from the mesh bag 85, air bubbles can be effectively removed, and the coating liquid exudes from a wider area at the lower end of the mesh bag 85 and diffuses more gently to the liquid surface S. Therefore, the coating liquid accumulated in the storage tank 40'is not agitated.

Since the mesh bag 85 is suspended on the liquid surface S, most of the weight of the coating liquid accumulated inside the mesh bag 85 does not act on the mesh bag 85. Therefore, it is possible to prevent the mesh bag 85 from coming off or being damaged. Furthermore, like the float 81, it is not affected by changes in the liquid level. Foreign matter mixed in the coating liquid can also be removed. Since it does not require a sensor or the like and has an extremely simple structure, it can be realized at low cost and is practical.

The coating liquid circulation supply device according to the present invention is not limited to the above-described embodiment, and includes various other configurations.

The coating liquid circulation supply devices 2 and 2'are suitable for, but are not limited to, the coating device 1 described above. It is applicable as long as it is a coating device that circulates and supplies a coating liquid, such as a coating device as in Patent Document 2 or another type of coating device. The float 81 may be a porous one into which the coating liquid penetrates. The upper surface of the float 81 may be spherical, or a group of irregularities may be formed in order to prevent the coating liquid from splashing. It may be attached to mesh bags reference embodiment on the float implementation forms.

1 Coating device 2 Coating liquid circulation supply device 40 Storage tank 50 Liquid feeding path 54 Upstream end 60 Return path 64 Downstream end 65 Outlet 70 Liquid feeding structure 71 Bubble guard 71a Communication port 73 Centrifugal pump 80 Flow down Impact mitigation structure 81 Float 82 Lifting guide 85 Mesh bag S Liquid level

Claims (2)

It is a coating liquid circulation supply device that circulates and supplies the coating liquid to the coating device.
A storage tank that stores the coating liquid with a space left above the liquid surface,
A liquid feeding route for transferring the coating liquid from the storage tank to the coating device, and
A return route for collecting the coating liquid from the coating device to the storage tank, and
With
Inside the storage tank, a lower end portion is placed on the bottom surface of the storage tank, and a liquid feeding structure is provided to feed the coating liquid to the liquid feeding path through a communication port formed at the lower end portion.
The return path has an outlet that allows the coating liquid to flow out in the space of the storage tank.
Wherein below the outlet, a stream of cushioning structure for diffusing the liquid surface receiving a coating solution flowing out from the outlet port is provided, et al was in a state of floating on the liquid surface,
The flow impact mitigation structure has a float that catches the coating liquid flowing out from the outlet on the upper surface.
A coating liquid circulation supply device in which the float is arranged below the outlet in a state in which the float can be raised and lowered. In the coating liquid circulation supply device according to claim 1,
The coating device includes a gravure roll and a chamber for supplying a coating liquid to the gravure roll.
The chamber has an upstream chamber for supplying the coating liquid to the upstream region and a downstream chamber for supplying the coating liquid to the downstream region of the rotating gravure roll.
The liquid return route collects the coating liquid from both the upstream side chamber and the downstream side chamber into the storage tank shared by them, and the liquid feeding route is from the storage tank to the upstream side chamber and the downstream side chamber. A coating liquid circulation supply device that transfers the coating liquid to both sides.

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