JP2018111054A - Coating liquid circulation supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating liquid circulation supply device for circulating and supplying a coating liquid which effectively suppresses mixing of air bubbles into a coating liquid in a storage tank. SOLUTION: A storage tank 40 for storing a coating liquid with a space left on a liquid surface S is provided, and a liquid return path has an outlet 65 for flowing out the coating liquid in the space of the storage tank 40. Then, the coating liquid is applied to a coating device provided below the outlet 65 with a flow-down impact mitigation structure 80 that receives the coating liquid flowing out from the outlet 65 while floating on the liquid surface S and diffuses it to the liquid surface S. A coating liquid circulation supply device that circulates and supplies. [Selection diagram] Fig. 2

Description

  The present invention relates to a coating liquid circulation supply apparatus attached to a coating apparatus that applies a coating liquid such as a printing apparatus or a coating apparatus.

  In general, a coating apparatus is provided with a plate cylinder (roll) for transferring a coating liquid such as ink, coating liquid, adhesive liquid, and paint to a 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 apparatus is provided with a coating liquid circulation and supply apparatus composed of a liquid feed pipe, a liquid return pipe, a pump, a storage tank, and the like.

  For example, Patent Document 1 discloses a gravure coating apparatus (double chamber type) in which two liquid reservoirs 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, bubbles are mixed into each liquid reservoir in the chamber at the time of application. When applied to a web with a coating liquid in which bubbles are mixed, the coating quality deteriorates, such as spots. Therefore, the coating liquid in which bubbles are mixed is returned to the storage tank through the return pipe, and the coating liquid from which the bubbles are removed is circulated and supplied to the liquid reservoir 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 return pipe to the liquid reservoir in the chamber. Therefore, it is disposed above the liquid level so as to be released 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 momentum of the coating liquid flowing down from the return pipe. In particular, the tendency is strong with a coating liquid having a high viscosity such as an adhesive liquid, and air entrainment is likely to occur when the liquid level is lowered.

  Therefore, in the coating apparatus 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.

  Patent Document 3 discloses a defoaming device that removes bubbles mixed in the liquid resin, although it does not relate to a 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 the piping path 3 for supplying the liquid resin from the liquid resin tank 4 to the discharge nozzle 5. The filter unit 130 includes a cylindrical filter body 140 made of a metal mesh, and a holding frame 150 that is mounted in the buffer tank 120 and supports the filter body 140.

  The holding frame 150 has a bottom plate 155 that is inclined and expands between the lower end of the filter body 140 and the liquid surface, and the liquid resin sent to the buffer tank 120 by the pump 110 passes through the filter body 140. It falls on the bottom plate 155, passes along the upper surface, adheres to the inner wall of the buffer tank 120, and flows down on the liquid surface.

JP 2012-170835 A JP 2000-84453 A JP2013-233696A

  When the coating apparatus is in operation, the liquid level of the coating liquid accumulated in the storage tank varies.

  By using the coating liquid in the coating apparatus, the amount of the coating liquid that accumulates in the storage tank gradually decreases. Therefore, in the case of manually replenishing the coating liquid, the liquid level of the coating liquid accumulated in the storage tank is lowered until a new coating liquid is replenished. When the liquid level is lowered, the drop distance of the coating liquid is increased accordingly, and air is 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 varies. Therefore, if the tip of the return pipe is placed sufficiently away from the fluctuating liquid surface so that it does not immerse when the coating liquid increases, the falling distance of the coating liquid increases and air entrainment tends to occur. . Furthermore, if the liquid level fluctuates greatly, air entrainment tends to occur particularly when the liquid level falls.

  Therefore, in order to control the vertical movement of the liquid level to be small, the coating apparatus of Patent Document 2 is provided with a sensor for detecting the liquid level while arranging the tip of the return pipe near the liquid level, Based on this, the liquid level of the coating liquid is controlled. Similarly, the defoaming device of Patent Document 3 proposes to control the liquid level of the liquid resin accumulated in the buffer tank with a sensor so that the bottom plate is positioned near the liquid surface.

  However, in order to stably control the vertical movement of the liquid level to be small, sophisticated sensors, control devices, control software, and the like 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. Therefore, the flow rate of the coating liquid is generally increased.

  If the flow rate of the coating liquid is large, the momentum of the coating liquid flowing down from the return pipe increases, making it easy to entrain air, and the coating liquid mixed with bubbles reaches the bottom of the storage tank. The liquid will be stirred. Therefore, there is a possibility that a good bubble removal effect cannot be obtained. Since the liquid level moves up and down, the liquid level control tends to become unstable.

  In particular, in a double-chamber type coating apparatus such as Patent Document 1, a large amount of bubbles tend to be generated in one liquid pool. Therefore, if the coating liquid mixed with a large amount of bubbles is mixed in the storage tank, the coating liquid mixed with bubbles is again supplied to both the liquid reservoirs, resulting in deterioration of coating quality.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a coating liquid circulation supply device that can effectively suppress the mixing of bubbles into a coating liquid in a storage tank while having a very simple configuration.

  The present invention relates to a coating liquid circulation supply device that circulates and supplies a coating liquid to a coating device. The coating liquid circulation supply device includes a storage tank that stores the coating liquid in a state where a space is left on the liquid surface, a liquid supply path that transfers the coating liquid from the storage tank to the coating apparatus, and the coating apparatus. A liquid return path for collecting the coating liquid in the storage tank. The liquid return path has an outlet through which the coating liquid flows out in the space of the storage tank. A downward impact mitigating structure is provided below the outlet for receiving the coating liquid flowing out from the outlet in a state of floating on the liquid level and diffusing the coating liquid to the liquid level.

  That is, according to this coating liquid circulation supply device, a downward impact mitigation structure for receiving the coating liquid flowing out from the outlet and diffusing it on the liquid surface is provided below the outlet located in the space above the storage tank. Therefore, the impact of the flowing coating liquid can be absorbed and reduced. And since the received coating liquid is diffused to the liquid surface, the bubbles mixed in the coating liquid through these processes can be effectively removed.

  Furthermore, since the falling impact mitigating structure is floating on the liquid surface, the impact applied to the falling impact mitigating structure can be efficiently absorbed and relaxed through the liquid surface. Thereby, the entrainment of air is suppressed, and it is also possible to prevent the coating liquid mixed with bubbles from reaching the bottom of the storage tank and stirring the coating liquid. Since the falling impact mitigation structure is floating on the liquid surface, it is not affected by the change in the liquid level.

  The downflow impact mitigating 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 disposed below the outflow port so as to be movable up and down. .

  According to this configuration, since the structure is extremely simple, the falling impact mitigation structure can be realized at a low cost, which is practical.

  Further, the falling impact mitigating structure has a flexible mesh bag that receives the coating liquid flowing out from the outlet, and the mesh bag is suspended in a state where the lower end portion is immersed in the coating liquid. It can also be configured to be disposed below.

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

  Particularly in this case, the amount of the coating liquid flowing out from the outlet is such that the liquid level of the coating liquid stored 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 flow rate of the coating liquid from the mesh bag.

  By doing so, it is possible to diffuse the coating liquid accumulated in the storage tank without any trouble while moderately reducing the falling impact of the coating liquid.

  The coating liquid circulation supply apparatus described above is particularly suitable for a gravure coating apparatus. Specifically, the coating apparatus includes a gravure roll and a chamber for supplying a coating liquid to the gravure roll, and the chamber supplies a coating liquid to an upstream region of the rotating gravure roll. An upstream chamber and a downstream chamber for supplying a coating liquid to the downstream region, and the liquid return path is configured to apply the coating liquid to the storage tank shared by both the upstream chamber and the downstream chamber. It is effective when collecting and transferring the coating liquid from the storage tank to both the upstream chamber and the downstream chamber.

  According to the coating liquid circulation supply apparatus of the present invention, it is possible to effectively suppress the mixing of bubbles into the coating liquid in the storage tank with a very simple configuration.

It is the schematic which shows the coating device in 1st Embodiment, and the coating-liquid circulation supply apparatus attached to this. It is the schematic which shows the detail of the storage tank in 1st Embodiment. It is the schematic which shows the detail (state with a low liquid level) of the storage tank in 2nd Embodiment. It is the schematic which shows the detail (state with a high liquid level) of the storage tank in 2nd Embodiment. It is explanatory drawing when the falling 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 merely illustrative in nature and does not limit the present invention, its application, or its use.

<First Embodiment>
FIG. 1 shows a coating apparatus 1 and a coating liquid circulation supply apparatus 2 attached thereto in the first embodiment. The coating apparatus 1 includes a backup roll 10, a gravure roll 20, a chamber 30, and the like. The coating liquid circulation supply apparatus 2 includes a storage tank 40, a liquid feeding path 50, a liquid returning path 60, and the like. Yes.

(Applicator)
In FIG. 1, symbol W is a base material to be coated, and the base material W is transported at a constant speed in a predetermined direction (from bottom to top in FIG. 1) at the time of coating. The gravure roll 20 sandwiches the substrate W to be conveyed in cooperation with the backup roll 10 that is rotatably supported in a state in which the gravure roll 20 is rotationally driven in a direction opposite to the conveyance direction of the substrate W. By doing so, the gravure roll 20 pressed against the substrate W continuously applies the coating liquid supplied from the chamber 30 to the substrate W.

  The chamber 30 includes 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-like member extending along the gravure roll 20 and has a horizontally-long concave portion 31 a on the 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 rotational direction of the gravure roll 20). A horizontally long seal blade 33 is attached to the end of the chamber body 31 below the recess 31a (upstream in the rotational 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. And both ends of the longitudinal direction of the recess 31a are closed by side plates (not shown). As a result, a sealed horizontally long space (a liquid pool) in contact with the peripheral surface of the gravure roll 20 is formed between the gravure roll 20 and the chamber body 31.

  Further, in the coating apparatus 1, the tip of the inner blade 34 is in pressure contact with the peripheral surface of the gravure roll 20, so that the liquid pool is in the upstream region in the rotation direction with respect to the peripheral surface of the rotating gravure roll 20. The upstream chamber 35 is in contact with the downstream chamber 36 in contact with the downstream region in the rotation direction. Accordingly, the coating liquid is supplied from the upstream chamber 35 in the upstream area of the peripheral surface of the gravure roll 20 in contact with the liquid reservoir, and the coating liquid is supplied from the downstream chamber 36 in the downstream area. ing.

  In order to circulate and supply the coating liquid to each of the upstream chamber 35 and the downstream chamber 36, the chamber body 31 has an upstream inlet 35 a communicating with the lower portion of the upstream chamber 35, and an upstream side communicating with the upper portion of the upstream chamber 35. Each of the outlet 35 b, the downstream inlet 36 a that communicates with the lower portion of the downstream chamber 36, and the downstream outlet 36 b that communicates with the upper portion of the downstream chamber 36 is formed. Then, the coating liquid circulation supply device 2 circulates and supplies the coating liquid to the upstream chamber 35 through the upstream inlet 35a and the upstream outlet 35b, and the downstream chamber 36 through the downstream inlet 36a and the downstream outlet 36b. The coating liquid is circulated and supplied.

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

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

  The liquid feeding path 50 is composed of a pipe, a hose, and the like, and includes 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 The main branch path 53 is connected to the upstream branch path 51 and the downstream branch path 52 and extends to the storage tank 40. The liquid return path 60 is also composed of a pipe, a hose, and the like, and includes an upstream branch outlet 61 connected to the upstream outlet 35b, a downstream branch outlet 62 connected to the downstream outlet 36b, and The main branch path 63 is connected to the upstream branch lead path 61 and the downstream branch lead path 62 and extends to the storage tank 40.

  In FIG. 2, the detail of the storage tank 40 of this embodiment is shown. 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 an openable / closable lid 42 that covers the opening on the upper surface of the tank body 41. The storage tank 40 is set to a size that allows an appropriate amount of coating liquid to be stored with a margin relative to the amount used in the coating apparatus 1. That is, the size is set such that when a sufficient amount of coating liquid is put in the storage tank 40, a space remains on the storage tank 40. FIG. 2 illustrates the liquid level S at the lower level (shown by a solid line) and the liquid level Sh at the uppermost level (the liquid level at the upper limit value of the liquid level) with a virtual line.

  Inside the storage tank 40, a liquid feeding structure 70 is provided for sending out the coating liquid in a state where mixing of bubbles is suppressed.

  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 its lower end is placed on the bottom surface of the storage tank 40. A communication port 71 a is formed in an arc shape in the peripheral wall at the lower end of the bubble guard 71, and the coating liquid flows into the bubble guard 71 through the communication port 71 a.

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

  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 73 a is connected to the end 54 on the upstream side of the liquid supply path 50.

  An end portion 64 on the downstream side of the liquid return path 60 is also inserted into the storage tank 40 from the opening on the upper surface of the storage tank 40. The outlet 65 that opens to the downstream end 64 of the liquid return path 60 and allows the coating liquid to flow out is disposed in a space above the uppermost liquid surface Sh so as not to be immersed in the coating liquid. Yes.

  A falling impact mitigation structure 80 is also provided inside the storage tank 40.

  The falling impact mitigating structure 80 has a function of receiving the coating liquid flowing out from the outlet 65 in a state of floating on the liquid level S and diffusing it to the liquid level S, and is disposed below the outlet 65. The falling impact mitigation structure 80 of the present embodiment is configured by a float 81, a lifting guide 82, and the like.

  The float 81 is made of, for example, a lightweight and low-density plate-like member such as foamed polyethylene, and is used that does not float and sink on the liquid surface S of the coating liquid.

  The raising / lowering guide 82 is composed of a plurality of rod-like 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 outside the predetermined range below the outlet 65 in the horizontal direction. Displaces vertically as the position changes.

  By providing such a falling impact mitigation structure 80, it is possible to promote the removal of bubbles mixed in the coating liquid collected in the storage tank 40, and to reduce the impact when the collected coating liquid flows down. Thus, mixing of bubbles into the coating liquid stored in the storage tank 40 can be suppressed.

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

  However, as shown in FIG. 4, in the case where such a falling impact mitigation structure 80 is not provided, the consumption of the coating liquid proceeds in the coating apparatus 1, and the amount of the coating liquid accumulated in the storage tank 40 decreases. When the liquid level decreases, the coating liquid flowing down from the outlet 65 flows into the coating liquid accumulated in the storage tank 40 with a strong momentum. Then, the coating liquid in which bubbles are mixed reaches the bottom of the storage tank 40 while further entraining air, and the coating liquid in the storage tank 40 is stirred, so that the coating liquid in which bubbles are mixed includes the upstream chamber 35 and the downstream chamber. 36 will be supplied to both.

  In particular, the greater the circulation amount of the coating liquid, the stronger the momentum of the coating liquid flowing down from the outlet 65, and the greater the influence. As a result, the amount of bubbles in both the upstream chamber 35 and the downstream chamber 36 increases, so that the circulation amount of the coating liquid is increased in an attempt to remove the bubbles from both the upstream chamber 35 and the downstream chamber 36. If it does so, the momentum of the coating liquid which flows down from the outflow port 65 will become strong, and the coating liquid with many bubble quantities will be supplied to both the upstream side chamber 35 and the downstream side chamber 36, and will fall into a vicious circle.

  On the other hand, when the falling impact mitigation structure 80 as shown in FIG. 2 is provided, since the coating liquid flowing down from the outlet 65 is received by the upper surface of the float 81, the impact is absorbed and relaxed. Since the float 81 floats on the liquid surface S, the impact applied to the float 81 is also efficiently absorbed and relaxed through the liquid surface S. Thereby, entrainment of air is suppressed, and it is also possible to prevent the coating liquid mixed with 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. Air bubbles mixed in the coating liquid can be effectively removed through these processes. Moreover, since the float 81 floats on the liquid surface S, it is not affected by the change in the liquid level. A sensor or the like is also unnecessary, and since it has a very simple structure, it can be realized at a low cost and is practical.

Second Embodiment
3A and 3B show the main part (storage tank 40 ′) of the coating liquid circulation supply device 2 of the second embodiment. Since the basic configuration of the coating apparatus 1 and the like is the same as that of the first embodiment, the same reference numerals are used for the same configurations and description thereof is omitted.

  In the storage tank 40 ′ of the present embodiment, the falling impact mitigation structure 80 is different from the coating liquid circulation supply device 2 of the first embodiment. That is, the falling impact mitigation structure 80 of the present embodiment is composed of a flexible mesh bag 85.

  The mesh bag 85 is obtained by processing a flexible thin cloth-like sheet having a mesh (mesh) of a predetermined size in the entire region into a vertically long bag shape so that the outflow port 65 is located above the inside of the mesh bag 85. The opening is tied to the downstream end 64 of the liquid return path 60. Accordingly, the mesh bag 85 is suspended from the downstream end 64 of the liquid return path 60 and is disposed below the outlet 65.

  Even when the mesh bag 85 reaches the lower limit (at least above the centrifugal pump 73 and is usually managed above), the lower surface of the coating liquid S collected in the storage tank 40 ′. Is set so as to be immersed in the coating liquid (at least enter below the liquid surface S). Thereby, the lower end part of the mesh bag 85 in which the coating liquid accumulates can float on the liquid surface S of the coating liquid in a state where a part of the mesh bag 85 sinks.

  All the coating liquid flowing down from the outflow port 65 is received by the mesh bag 85 and then flows out through the mesh. At this time, the coating liquid flows out from the outlet 65 so that the level of the coating liquid stored in the mesh bag 85 is higher than the 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 size of the mesh of the mesh bag 85 is selected in accordance with the circulation amount of the coating liquid so that the coating liquid is appropriately accumulated in 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 or passes through the mesh bag 85 and the mesh bag 85 is filled with a space inside the mesh bag 85. This is a state in which the coating liquid is accumulated at the lower part of the mesh bag 85 and there is a space above it.

  By doing so, it is possible to diffuse the coating liquid stored in the storage tank 40 ′ without any trouble while moderately reducing the falling impact of the coating liquid.

  As shown in FIG. 3A, in a state where the liquid level S is low, the mesh bag 85 is vertically long and the lower end portion thereof is swollen because the coating liquid is appropriately accumulated in the mesh bag 85. The lower end portion of the mesh bag 85 in which the coating liquid is accumulated floats on the liquid surface S in a state where a part of the mesh bag 85 is immersed in the coating liquid. The coating liquid flowing down from the outlet 65 is received in the mesh bag 85 and received in the mesh bag 85, and the momentum of the coating liquid is relaxed. Therefore, the coating liquid stored 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 by its own weight. Since the coating liquid flows out through the mesh (pores), the bubbles mixed in the coating liquid can be effectively removed. Further, since the coating liquid oozes out 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 stored in the storage tank 40 ′.

  Even if the liquid level S becomes high, the lower end of the mesh bag 85 only floats in the horizontal direction as shown in FIG. 3B and floats while being immersed in the liquid level S. Therefore, since the coating liquid flowing down from the outlet 65 is received by the mesh bag 85 and the mesh bag 85 is received and the momentum is eased, the coating liquid stored in the storage tank 40 ' I hardly receive it.

  Air bubbles can be effectively removed by the coating liquid flowing out of the mesh bag 85, and the coating liquid oozes out 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 collected in the storage tank 40 ′ is not stirred.

  Since the mesh bag 85 is floating on the liquid surface S, most of the weight of the coating liquid accumulated in the mesh bag 85 does not act. Therefore, it is possible to prevent the mesh bag 85 from being detached or damaged. Further, like the float 81, the liquid level is not affected by the change. Foreign matter mixed in the coating liquid can also be removed. A sensor or the like is also unnecessary, and since it has a very simple structure, it can be realized at a low cost and is practical.

  In addition, the coating-liquid circulation supply apparatus concerning this invention is not limited to embodiment mentioned above, The other various structure is included.

  The coating liquid circulation supply devices 2 and 2 ′ are suitable for the coating device 1 described above, but are not limited thereto. Any coating apparatus that circulates and supplies a coating liquid, such as a coating apparatus as in Patent Document 2 and other types of coating apparatuses, is applicable. The float 81 may be a porous material into which the coating liquid enters. 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. The mesh bag of the second embodiment may be attached on the float of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Application | coating apparatus 2 Coating liquid circulation supply apparatus 40 Storage tank 50 Liquid sending path 54 Upstream end part 60 Return liquid path 64 Downstream end part 65 Outlet 70 Feeding structure 71 Bubble guard 71a Communication port 73 Centrifugal pump 80 Downflow Impact relaxation structure 81 Float 82 Lift guide 85 Mesh bag S Liquid surface

Claims (5)

A coating liquid circulation supply device that circulates and supplies coating liquid to a coating device
A storage tank for storing the coating liquid in a state of leaving a space above the liquid surface;
A liquid feeding path for transferring the coating liquid from the storage tank to the coating apparatus;
A liquid return path for collecting the coating liquid from the coating apparatus to the storage tank;
With
The liquid return path has an outlet through which the coating liquid flows out in the space of the storage tank,
A coating liquid circulation and supply device provided with a falling impact mitigation structure for receiving a coating liquid flowing out from the outlet while being floated on the liquid level and diffusing to the liquid level below the outlet. In the coating liquid circulation supply device according to claim 1,
The falling impact mitigation structure has a float that receives the coating liquid flowing out from the outlet at the upper surface,
A coating liquid circulation supply device in which the float is arranged below the outflow port so as to be movable up and down. In the coating liquid circulation supply device according to claim 1,
The falling impact mitigating structure has a flexible mesh bag for receiving a coating liquid flowing out from the outlet,
A coating liquid circulation supply device in which the mesh bag is arranged below the outflow port in a state of being suspended so that a lower end portion is immersed in the coating liquid. In the coating liquid circulation supply device according to claim 3,
The amount of coating liquid flowing out from the outlet and the mesh bag so that the liquid level of the coating liquid stored inside the mesh bag is higher than the liquid level of the coating liquid stored in the storage tank. Coating liquid circulation supply device in which the amount of coating liquid flowing out of the liquid is adjusted. In the coating-liquid circulation supply apparatus as described in any one of Claims 1-4,
The coating apparatus includes a gravure roll and a chamber for supplying a coating liquid to the gravure roll,
The chamber has an upstream chamber for supplying a coating liquid to an upstream region of the rotating gravure roll, and a downstream chamber for supplying a coating liquid to a downstream region thereof,
The liquid return path collects the coating liquid from both the upstream side chamber and the downstream side chamber to the storage tank shared by them, and the liquid supply path extends from the storage tank to the upstream side chamber and the downstream side chamber. Coating liquid circulation supply device that transfers the coating liquid to both sides.

Images