JP2012170829A - Coating solution pan, method for circulating coating solution and method for producing coated article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating solution pan, a method for circulating a coating solution and a method for producing a coated article, by which occurrence of a coating defect can be suppressed.SOLUTION: The coating solution pan 4 is used for storing the coating solution, which is applied on a band-shaped base material transported in a longitudinal direction, and is used for dipping a plate cylinder therein. The coating solution pan 4 stores the coating solution 2 respectively at least one at a front face, a side surface and a corner portion formed with the front face and the side surface, and includes: front part weir plate 6a, a corner part weir plate 6b and a side part weir plate 6c, which are movable types for damming up them till overflowing; and a coating solution recovering pan 16 for recovering the overflowing coating solution at a position surrounding the front face and the side surface of the coating solution pan 4.

Description

  The present invention relates to a coating liquid pan for storing a coating liquid supplied from a coating liquid tank in a coating apparatus, and in particular, a high-viscosity coating liquid for a coating liquid pan included in a gravure coating machine. The present invention relates to a coating liquid pan that is circulated in a state of maintaining a uniform viscosity without being retained in a corner or the like in the coating liquid pan.

  As a coating film forming method for producing a coated product by applying a coating liquid to a belt-shaped substrate such as a film substrate to form a coated film, for example, there is a gravure coating method. Gravure coating is an extra coating solution that is applied on the circumferential surface of the gravure roll by supplying a coating liquid such as ink or coating agent to the surface of the gravure roll with cells formed on the circumferential surface. Is a printing method in which the coating liquid in the cell is transferred to the substrate after scraping with a doctor blade.

  In such a gravure coating, as a coating liquid supply method for supplying a coating liquid to a gravure roll, generally, a method in which a gravure roll is immersed in a coating liquid supplied in a coating liquid pan having a ship-shaped bottom. Is adopted.

  With reference to FIG. 3, the general coating liquid supply method and the coating liquid circulation method will be described. FIG. 3 is a schematic view showing a coating liquid pan and a coating liquid circulation method in general gravure coating.

  In general gravure coating, as shown in FIG. 3, a gravure roll 24, a doctor blade 26, a backup roll 28, a coating liquid tank 30, a coating liquid supply pump 32, and a coating liquid recovery pump. 34, a coating liquid circulation device 1 including a coating liquid pan 4, a coating liquid recovery pipe 20, and a coating liquid supply pipe 18 is used.

  In the coating liquid supply method performed using the coating liquid circulation device 1, the coating liquid pan 4 is filled with the coating liquid 2 such as ink or coating agent, and the coating liquid in the coating liquid pan 4 is filled. The lower part of the gravure roll 24 is immersed in the working liquid 2 and the gravure roll 24 is rotated.

  As a result, the coating liquid 2 is supplied to the entire circumferential surface of the gravure roll 24, the excess coating liquid 2 is scraped off by the doctor blade 26, and the coating liquid 2 in the cell is transferred to the surface of the substrate 36. .

  Here, when the amount of the coating liquid 2 in the coating liquid pan 4 is reduced to some extent, the coating liquid circulation device 1 replenishes the coating liquid 2 into the coating liquid pan 4 and applies the coating liquid 2 every time. A countermeasure is taken to keep the coating liquid 2 in the working liquid pan 4 in an appropriate amount.

  Specifically, the coating liquid 2 is also filled in the coating liquid tank 30, and the coating liquid 2 is supplied into the coating liquid pan 4 through the coating liquid supply pipe 18 by the coating liquid pump 32. In the coating liquid pan 4, the weir 6 that sets the liquid level to a certain level is provided, so that the excess coating liquid 2 is returned from the coating liquid recovery pipe 20 into the coating liquid tank 30. In this way, the coating liquid 2 is replenished in the coating liquid pan 4 and the coating liquid 2 in the coating liquid pan 4 is circulated through the coating liquid tank 30.

  As a conventional coating liquid pan, there exists a thing of the structure described in patent document 1 or patent document 2, for example besides the thing of the structure shown in FIG.

  The coating liquid pan described in Patent Document 1 is known as a coating liquid pan for a gravure roll. Specifically, at a position near the peripheral surface of the gravure roll on the side that comes out of the coating liquid by rotation, a position that is lower than the storage level of the coating liquid, or a position that extends from higher to lower than the storage level of the coating liquid. The intermediate plate in which notches and holes are formed is provided higher than the coating liquid storage level. Thereby, the coating liquid supplied from the coating liquid replenishing section is discharged from a notch or the like of the intermediate plate.

  However, in the coating liquid pan described in Patent Document 1, since the flow of the coating liquid tends to stay in the corner portion of the coating liquid pan, physical properties such as an increase in viscosity only in the upper part of the coating liquid in this portion. Changes, it becomes difficult to supply a coating liquid having a certain physical property to the surface of the gravure roll, and there is a concern that a coating defect may occur. This problem is particularly noticeable when a highly viscous coating solution is used.

  In addition, the coating liquid pan described in Patent Document 2 is provided with a coating liquid supply unit at the upper edge end of the rectangular casing included in the coating liquid pan in order to prevent partial retention of the coating liquid. And an overflow notch and a lower opening are provided above and below the other side. Thereby, it is possible to prevent a partial property change in the viscosity of the coating liquid and supply a coating liquid having a certain physical property to the gravure roll.

  However, in the case of a high-viscosity coating liquid with poor fluidity, it is difficult for the coating liquid near the side surface of the coating liquid pan to flow out only with the overflow notch and the lower opening provided on one side of the coating liquid pan. As a result, the coating liquid stays near the side surface of the coating liquid pan, and there is a possibility that physical properties change such as an increase in viscosity may occur, resulting in a problem that stable coating with a high viscosity coating liquid cannot be performed. There is a fear.

JP-A-2-297443 JP 7-314649 A

  The present invention relates to a coating liquid pan capable of circulating a high-viscosity coating liquid in a coating liquid pan while maintaining a uniform viscosity with respect to a coating liquid pan of a gravure coating machine. It is an object of the present invention to provide a coating liquid circulation method and a manufacturing method of a coated product using a coating.

The invention according to claim 1 of the present invention is the coating apparatus for applying the coating liquid to the belt-like substrate conveyed in the longitudinal direction, and the plate cylinder is inserted into the coating liquid supplied from the coating liquid tank. A coating liquid pan for storing the coating liquid to immerse,
At least one coating liquid supply port for supplying the coating liquid into the coating liquid pan on any one surface of the coating liquid pan;
A movable dam plate for storing the coating liquid and damming it until it overflows, at least one in each of the front and side surfaces of the coating liquid pan and the corner portions formed by the front and side surfaces;
A coating liquid collecting pan for collecting the overflowed coating liquid at a position surrounding the front and side surfaces of the coating liquid pan;
It is a coating liquid pan characterized by comprising.

In the invention according to claim 2 of the present invention, the barrier plate is disposed inside the coating liquid pan so as not to have a gap with the coating liquid pan, and each slides independently in the vertical direction. The coating liquid pan according to claim 1, wherein a storage amount of the coating liquid and a location where overflow occurs in the coating liquid pan can be adjusted.

  In the invention according to claim 3 of the present invention, the barrier plate is made of stainless steel whose surface is coated with fluororesin, and the upper end portion is bent toward the lower outside of the coating liquid pan. The coating liquid pan according to claim 1 or 2, characterized in that:

  According to a fourth aspect of the present invention, there is provided a coating liquid pan according to any one of the first to third aspects, a means for supplying the coating liquid to the coating liquid pan, and the overflowed coating. It is a coating liquid circulation method comprising a volume rotary pump or a volume reciprocating pump as means for returning the liquid to the coating liquid tank after collecting the working liquid.

  Invention of Claim 5 of this invention applies the said coating liquid to the said base material using the coating liquid pan of any one of Claim 1 to 3, The coating characterized by the above-mentioned. It is a manufacturing method of a thing.

  According to the first aspect of the present invention, at least one movable weir plate is provided at each of the front surface, the side surface, and the corner portion formed by the front surface and the side surface of the coating liquid pan. For this reason, it is possible to adjust the storage amount of the coating liquid in the coating liquid pan, and it is possible to overflow from an arbitrary location. A coating liquid recovery pan is provided around the front and side surfaces of the coating liquid pan. For this reason, the coating liquid overflowed from the front surface and side surface of the coating liquid pan can be easily recovered.

  According to the second aspect of the present invention, the dam plate is arranged in contact with the inside of the coating liquid pan so that there is no gap, and each slides up and down independently. For this reason, the coating liquid does not leak from between the movable dam plate and the coating liquid pan, and even if it leaks, it is recovered by the coating liquid recovery pan provided around the coating liquid pan. be able to. By individually sliding the weir plate up and down, it is possible to easily adjust the storage amount of the coating liquid and the location of overflow. For this reason, it is possible to selectively overflow the portion that tends to stay in the coating liquid pan, and slide each weir plate to the optimal position according to the amount of coating liquid stored and the circulation time. Coating work can be performed. As a result, changes in physical properties such as a partial increase in viscosity due to retention of the coating liquid can be suppressed, and a uniform viscosity can be maintained.

  According to the invention described in claim 3, the barrier plate is made of stainless steel whose surface is coated with fluororesin. For this reason, the surface of the dam plate has high water repellency, and even a highly viscous coating solution can flow smoothly in the process of overflowing, and the cleaning operation after the coating operation is easy. Further, the upper end portion of the barrier plate is bent toward the outer lower side of the coating liquid pan. For this reason, it is possible to prevent the overflowing coating liquid from flowing down along the bent dam plate, reliably flowing into the coating liquid collecting pan, and dripping on the front and side portions of the coating liquid pan.

  According to the invention described in claim 4, the coating liquid pan provided with the movable dam plate is used, and the means for supplying the coating liquid to the coating liquid pan and the overflowed coating liquid are collected and then applied. As a means for returning to the working fluid tank, a volume rotary pump or a volume reciprocating pump is provided. For this reason, the operation of supplying the coating liquid into the coating liquid pan and the operation of returning the coating liquid recovered through the coating liquid recovery pan to the coating liquid tank can be easily performed. It becomes possible to circulate the working fluid.

According to invention of Claim 5, it is possible to apply | coat a highly viscous coating liquid to the base material conveyed continuously in the state which maintained the uniform viscosity. For this reason, the quality of the coating film formed by applying the coating liquid to the substrate can be improved, and a high-quality coated product can be produced.

  Since the coating liquid pan of the present invention can circulate the high-viscosity coating liquid in the coating liquid pan while maintaining a uniform viscosity, it is possible to suppress the occurrence of coating defects. Become.

It is a perspective view which shows schematic structure of the coating liquid pan of this invention. It is sectional drawing which shows schematic structure of the coating liquid bread | pan of this invention. It is the schematic which showed the coating liquid pan and coating liquid circulation method in general gravure coating.

  Hereinafter, the structure of the coating liquid pan 4 of this embodiment is demonstrated about FIG. 1 and FIG. 2 about 1st embodiment (henceforth this embodiment) of this invention.

  FIG. 1 is a perspective view showing a schematic configuration of a coating liquid pan 4 of the present invention, and FIG. 2 is a sectional view from the side.

  The coating liquid pan 4 is an apparatus that stores the supplied coating liquid 2 in a coating apparatus that applies to a strip-shaped substrate conveyed in the longitudinal direction. The lower part of the gravure roll 24 is immersed in the coating liquid 2 supplied into the coating liquid pan 4.

  In the present embodiment, as an example, a case where the base material is a belt-like film will be described.

  In the present embodiment, as an example, a case where the coating liquid 2 is a liquid that is a high-viscosity coating agent will be described. In addition, it is suitable for the coating liquid 2 used for the coating liquid pan 4 of this embodiment that the viscosity is 500 mPa * s or more, for example. This is because in the case of the coating liquid 2 having a viscosity of less than 500 mPa · s, it is difficult for the viscosity to be biased due to retention in the coating liquid pan 4. This is because it is not necessary to selectively overflow the coating liquid 2. However, the coating liquid 2 used for the coating liquid pan 4 of this embodiment is not particularly limited.

  The coating liquid pan 4 is formed in a box shape having an upper opening, and a coating liquid supply port 8 is formed on the back surface. The front dam plate 6 a, the corner dam plate 6 b, the side dam plate 6 c, the coating liquid recovery pan 16, and the coating liquid recovery port 10 are provided.

  The coating liquid supply port 8 allows the coating liquid 2 to flow into the coating liquid pan 4. A plurality of coating liquid supply ports 8 may be formed along the width direction of the substrate.

  The front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c are made of stainless steel, and the surfaces thereof are coated with a fluororesin. These are arranged in contact with the inside of the coating liquid pan 4 and are attached so that each slides up and down independently and can be fixed at a desired position.

Here, when the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c are arranged, one front dam plate 6a is provided on the front portion of the coating liquid pan 4, and each corner portion is provided. It is desirable to arrange a total of five dam plates 6 having the largest possible width, one corner dam plate 6b having the same shape and one side dam plate 6c having the same shape on the side surface. If the width of the weir plate 6 is narrow, the coating liquid 2 does not uniformly overflow from the coating liquid pan 4, and a local staying portion may occur. The front and side surfaces of the coating liquid pan 4 leave a minimum width that can accommodate a mechanism for sliding the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c. It is desirable to arrange the part dam plate 6b and the side part dam plate 6c.

  The vertically slidable range of the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c is a range in which the side dam plate 6c does not interfere with the rotation axis of the gravure roll 24, and The position of the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c with which the coating liquid 2 supplied into the coating liquid pan 4 becomes a storage amount sufficiently supplied to the gravure roll 24 is used as a reference. In addition, it is desirable that the distance is approximately the same in the upward direction and the downward direction, and the distance is usually approximately 50 mm, but is not limited thereto.

  The upper end portions of the front dam plate 6 a, the corner dam plate 6 b, and the side dam plate 6 c are bent toward the lower outside of the coating liquid pan 4. The dimension of the bent portion may be in a range satisfying that the overflowed coating liquid 2 surely flows down to the coating liquid recovery pan 16 described later.

  The coating liquid recovery pan 16 is provided at a position surrounding the coating liquid pan 4 and flows through the upper end portions of the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c. The coating liquid 2 is collected. The coating liquid collection pan 16 is disposed along the coating liquid pan 4 at a position about 20 to 50 mm away from the front and side surfaces of the coating liquid pan 4. In addition, the bottom surface of the coating liquid recovery pan 16 is not horizontal, and is inclined toward the coating liquid recovery port 10, and the coating liquid 2 that has overflowed and has flowed down to the coating liquid recovery pan 16 is applied. It flows toward the working liquid recovery port 10. The inclination of the bottom surface of the coating liquid recovery pan 16 is preferably 3 ° to 10 °, but is not limited thereto.

  The coating liquid supply means is an unillustrated coating liquid supply pump 32 (see FIG. 3), and is provided with a volume rotary pump or a volume reciprocating pump. The coating liquid supply pump 32 is a pump capable of sucking and discharging the coating liquid 2. The coating liquid supply pump 32 sucks the coating liquid 2 stored in the coating liquid tank 30 and applies the coating liquid supply pipe 18 and the coating liquid. The coating liquid 2 is supplied into the coating liquid pan 4 through the liquid supply port 8.

  The coating liquid recovery means is a coating liquid recovery pump 34 (see FIG. 3) that is not shown, and is provided with a volume rotary pump or a volume reciprocating pump. The coating liquid recovery pump 34 is a pump capable of sucking and discharging the coating liquid 2. The coating liquid 2 recovered from the coating liquid pan 4 is sucked through the coating liquid recovery pipe 20 to be applied. The coating liquid 2 is returned to the working liquid tank 30.

  Therefore, the coating liquid 2 is supplied from the coating liquid tank 30 through the coating liquid supply pump 32 to the coating liquid supply pipe 18, the coating liquid supply port 8, the coating liquid pan 4, the front dam plate 6a, The corner dam plate 6b, the side dam plate 6c, the coating liquid recovery pan 16, the coating liquid recovery port 10, the coating liquid recovery pipe 20, and the coating liquid recovery pump 34 are circulated.

  Next, the coating liquid circulation method of this embodiment will be described with reference to FIGS.

In the coating liquid circulation method of the present embodiment, in the coating liquid pan provided in the coating apparatus for applying the coating liquid to the belt-shaped substrate conveyed in the longitudinal direction, supply and discharge of the coating liquid are repeated, This is a method of circulating the coating liquid.
Specifically, the coating liquid 2 stored in the coating liquid tank 30 is supplied from the coating liquid supply port 8 formed on the back surface of the coating liquid pan 4 via the coating liquid supply pump 32, Overflow from the movable front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c arranged in the coating liquid pan 4, pass through the coating liquid recovery pan 16, and further, the coating liquid recovery port 10 (the flow of the coating liquid is indicated by a dotted arrow A), and the coating liquid is returned to the coating liquid tank 30 via the coating liquid recovery pump 34, whereby the high-viscosity coating in the coating liquid pan 4 is applied. In this method, the liquid 2 is circulated by a certain amount while maintaining a uniform viscosity.

  Next, with reference to FIGS. 1 to 3, a method for manufacturing a coated product using the coating liquid pan 4 of the present embodiment will be described.

  In the manufacturing method of the coated product using the coating liquid pan 4 of the present embodiment, the coating liquid 2 is applied to the substrate 36 that is continuously conveyed, and the coating film made of the coating liquid 2 is used as a base. Formed on the material 36 to produce a coated product. Since the coating can be performed in a state where the properties such as the viscosity of the coating liquid 2 are constant, a uniform coated product can be stably obtained.

  Next, the operation of this embodiment will be described with reference to FIGS.

  The coating liquid 2 in the coating liquid tank 30 is supplied into the coating liquid pan 4 via the coating liquid supply pump 32. At this time, the barrier plate 6 is fixed in a state of being slid to the highest position.

  When the storage amount of the coating liquid 2 in the coating liquid pan 4 reaches an amount sufficiently supplied to the gravure roll 24, the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c The liquid level is lowered to the vicinity of the coating liquid 2 and the supply of the coating liquid 2 is continued.

  By continuing to supply the coating liquid 2 to the coating liquid pan 4, the coating liquid 2 in the coating liquid pan 4 is either the front dam plate 6a, the corner dam plate 6b, or the side dam plate 6c. It overflows further and flows down toward the coating liquid recovery pan 16.

  At this time, the upper end portions of the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c are bent toward the lower outside of the coating liquid pan 4, and the surface is coated with fluororesin. Therefore, the coating liquid 2 surely flows into the coating liquid collection pan 16 without dripping on the outer surface of the coating liquid pan 4.

  Here, the state of the coating liquid 2 in the coating liquid pan 4 is confirmed, and if there is a staying portion, the dam plate 6 in the vicinity thereof is slid downward, and the other dam plate 6 is slid upward. Let As a result, the portion of the coating liquid 2 staying in the coating liquid pan 4 can be preferentially overflowed.

  Thus, by adjusting the positions of the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c, the coating liquid 2 in the coating liquid pan 4 overflows uniformly throughout. Therefore, changes in physical properties such as a partial increase in viscosity of the coating liquid 2 can be prevented.

  The overflowed coating liquid 2 flows down to the coating liquid recovery pan 16, and moves toward the coating liquid recovery port 10 due to the inclination formed on the bottom surface of the coating liquid pan 16, and the coating liquid recovery pipe 20 and the coating liquid. The liquid is returned to the coating liquid tank 30 through the recovery pump 34, and is again supplied to the coating liquid pan 4 through the coating liquid supply pipe 18 and the coating liquid supply port 8 through the coating liquid supply pump 32. The

  Therefore, it becomes possible to circulate a certain amount of the high-viscosity coating liquid 2 in the coating liquid pan 4 while maintaining a uniform viscosity.

<Example 1>
One embodiment of the present invention is as shown in FIG. 1 and FIG. 2, and the coating liquid 2 stored in the coating liquid tank 30 is passed through the coating liquid supply pump 32 to the back of the coating liquid pan 4. Adjusting the positions of the movable front dam plate 6 a, the corner dam plate 6 b, and the side dam plate 6 c that are supplied from the coating liquid supply port 8 formed on the surface and disposed in the coating liquid pan 4. Then, the overflow amount and location of the coating liquid 2 are adjusted, and the overflowed coating liquid 2 is led to the coating liquid recovery pan 16 and further passed through the coating liquid recovery port 10 (the flow of the coating liquid is reduced). In this state, the high-viscosity coating liquid 2 in the coating liquid pan 4 is maintained at a uniform viscosity by returning it to the coating liquid tank 30 via the coating liquid recovery pump 34. It has a device configuration that circulates a certain amount.

  In this example, a coating agent having a viscosity of 4500 mPa · s in which pigment particles are dispersed in the coating liquid tank 30 is supplied into the coating liquid pan 4 via the coating liquid supply pump 32. The coating liquid pan 4 has a box shape with an upper opening made of stainless steel, the size of the bottom surface is 500 mm in the longitudinal direction of the base material 36 and 1400 mm in the width direction, and the coating liquid pan excluding the barrier plate 6 is used. The depth of 4 is 150 mm. The gravure roll 24 has a diameter of 400 mm.

  In this embodiment, the width of the front dam plate 6a is 900 mm, the width of the corner dam plate 6b is 150 mm on the front and side surfaces, and the width of the side dam plate 6c is 200 mm. The movable range in the vertical direction of the plate 6b and the side dam plate 6c was 100 mm. The front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c are each provided with a slide mechanism using a rail made of stainless steel, and can be fixed at a desired position with screws, and are attached to the coating liquid pan 4. It was.

  In the present embodiment, the stainless steel coating liquid recovery pan is disposed along the coating liquid pan 4 at a position 40 mm away from the front and side surfaces of the coating liquid pan 4, and the bottom surface of the coating liquid recovery pan 16. The coating liquid recovery port 10 was provided at the front center of the coating liquid, and the coating liquid recovery pan 16 was formed so as to have an inclination of about 5 ° toward the coating liquid recovery port 10.

  Next, the coating liquid 2 was supplied from the coating liquid tank 30 to the coating liquid pan 4 via the coating liquid supply pump 32 and the coating liquid supply pipe 18. The coating liquid supply ports 8 are circular with a diameter of about 50 mm, and three coating liquid supply ports 8 are arranged on the side surface of the coating liquid pan 4 in a straight line along the width direction of the base material 36. When the interval was about 500 mm, the coating liquid 2 was supplied into the coating liquid pan 4 while spreading uniformly. At this time, the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c are coated at the highest position, that is, the upper ends of the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c. The liquid pan 4 was fixed at a position 250 mm from the bottom surface.

  When it is confirmed that the coating liquid 2 in the coating liquid pan 4 is sufficiently supplied to the gravure roll 24, the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c are applied to the coating liquid. It was slid downward to a position about 20-30 mm higher than the liquid level of No. 2 and fixed. If the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c are slid downward from this position, sufficient coating liquid 2 is not supplied to the gravure roll 24, and stable coating can be performed. There is a risk of disappearing.

  When the supply of the coating liquid 2 was continued, the coating liquid 2 in the coating liquid pan 4 overflowed from the portion of the front dam plate 6a. At this time, the upper end portion of the front dam plate 6a is bent outward and downward of the coating liquid pan 4 and the surface is coated with fluororesin. It surely flowed down to the coating liquid recovery pan 16 without dripping on the outer surface.

  When the coating liquid 2 in the coating liquid pan 4 was observed, the coating liquid 2 stayed in the vicinity of the side surface of the coating liquid pan 4 and an increase in viscosity was confirmed. Here, the side dam plate 6c was slid downward by 20 mm, the corner dam plate 6b was slid downward by 10 mm, and the front dam plate 6a was further slid upward by 10 mm and fixed. As a result, the coating liquid 2 in the coating liquid pan 4 overflowed from the side dam plate 6c and the corner dam plate 6b. The overflow from the front weir plate 6a did not stop, although the amount decreased.

When the coating liquid 2 is continuously supplied in this state, the coating liquid 2 uniformly overflows from the front surface and the side surface of the coating liquid pan 4 and reliably flows into the coating liquid recovery pan 16, and the coating liquid recovery port 10 passed through the coating liquid recovery pump 34, returned to the coating liquid tank 30, and supplied again to the coating liquid pan 4 through the coating liquid supply pump 32.

  The coating liquid 2 is uniformly overflowed by the front dam plate 6a, the corner dam plate 6b, and the side dam plate 6c whose positions are adjusted, so that there is no stagnation in the coating liquid pan 4, The product was circulated without changing its physical properties such as an increase in viscosity.

  Therefore, in this embodiment, it was possible to circulate a certain amount of the high-viscosity coating liquid 2 in the coating liquid pan 4 while maintaining a uniform viscosity.

  INDUSTRIAL APPLICABILITY The coating liquid circulation device and the coating liquid circulation method of the present invention can be used in a wide range of fields such as high viscosity materials, for example, machines for producing adhesives or machines for producing and processing pasty foods. .

DESCRIPTION OF SYMBOLS 1 ... Coating liquid circulation apparatus 2 ... Coating liquid 4 ... Coating liquid pan 6 ... Dam plate 6a ... Front part dam plate 6b ... Corner part dam plate 6c ... Side part dam plate 8 ... Coating liquid supply port 10 ... Coating Work fluid recovery port 16 ... Coating fluid recovery pan 18 ... Coating fluid supply tube 20 ... Coating fluid recovery tube 24 ... Gravure roll 26 ... Doctor blade 28 ... Backup roll 30 ... Coating fluid tank 32 ... Coating fluid supply pump 34 ... Coating liquid recovery pump 36 ... Base material A ... Flow of coating liquid

Claims (5)

In a coating apparatus that applies a coating liquid to a strip-shaped substrate conveyed in the longitudinal direction, the coating liquid is stored in order to immerse the plate cylinder in the coating liquid supplied from the coating liquid tank. A coating liquid pan,
At least one coating liquid supply port for supplying the coating liquid into the coating liquid pan on any one surface of the coating liquid pan;
A movable dam plate for storing the coating liquid and damming it until it overflows, at least one in each of the front and side surfaces of the coating liquid pan and the corner portions formed by the front and side surfaces;
A coating liquid collecting pan for collecting the overflowed coating liquid at a position surrounding the front and side surfaces of the coating liquid pan;
A coating liquid pan characterized by comprising:   The dam plate is disposed inside the coating liquid pan so as not to have a gap with the coating liquid pan, and slides in the vertical direction individually, and the storage amount of the coating liquid, The coating liquid pan according to claim 1, wherein an overflow location in the coating liquid pan can be adjusted.   3. The dam plate is made of stainless steel whose surface is coated with a fluororesin, and an upper end portion is bent outward and downward of the coating liquid pan. Coating liquid pan.   Using the coating liquid pan according to any one of claims 1 to 3, the means for supplying the coating liquid to the coating liquid pan and the coating liquid after collecting the overflowed coating liquid The coating liquid circulating method, wherein the means for returning to the tank includes a positive displacement pump or a positive reciprocating pump.   The manufacturing method of the coated material characterized by apply | coating the said coating liquid to the said base material using the coating liquid pan of any one of Claim 1 to 3.

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