CN110586412B

CN110586412B - Coating tool

Info

Publication number: CN110586412B
Application number: CN201910509065.1A
Authority: CN
Inventors: 橘田浩贵
Original assignee: Tungaloy Corp
Current assignee: Tungaloy Corp
Priority date: 2018-06-13
Filing date: 2019-06-13
Publication date: 2021-07-06
Anticipated expiration: 2039-06-13
Also published as: JP6492255B1; JP2019217488A; CN110586412A

Abstract

The invention provides a coating tool, which can not generate a retention part in a manifold and can coat a coating film with uniform thickness without applying pulsation to a coating liquid. The coating tool 10 includes a body block having a manifold 17 for containing a liquid therein, a liquid supply portion 18 and a liquid discharge portion 7 extending from a side surface of the body block to the manifold 17, and a columnar stirring rod 3, and the stirring rod 3 is attached to the body block so as to pass through the inside of the manifold 17 and to be rotatable about the center axis thereof.

Description

Coating tool

Technical Field

The present invention relates to a coating tool for coating an object to be coated with a coating liquid supplied to a manifold formed in a body block from the manifold through a liquid outflow portion.

Background

Conventionally, as a coating tool, a slot die (slot die) is known, in which a pair of die members (head) are arranged adjacent to each other, and a coating liquid is applied to an object to be coated through a manifold formed between the die members and a slot communicating with the manifold and opening toward a tip end side of the die members, as disclosed in patent document 1.

Patent document

[ patent document 1] Japanese patent laid-open No. 2014-168735

Disclosure of Invention

Generally, when the speed of a fluid having thixotropy is reduced, the viscosity increases and the viscous resistance increases. When the viscous resistance becomes large, the velocity of the fluid further decreases for this reason, and finally a region where no flow occurs (hereinafter referred to as "stagnant portion") is formed. Therefore, if a coating liquid having thixotropy is used in the slit die, there is a possibility that a problem of sedimentation of solid components contained in the slurry (slurry) in a retention portion in the manifold, or a problem of gelation due to thickening of the coating liquid may occur.

In the coating tool disclosed in patent document 1, a shaft body having a spiral portion is disposed inside a manifold, and the shaft body is rotated to agitate the coating liquid, thereby preventing the generation of a stagnation portion.

However, in the case of the above method, in the buffer for reducing the pulsation caused by the pump or the pressure gradient in the feed liquid, the pulsation generated by the impeller is transferred to the film pressure of the coating film immediately before the coating operation is performed. Therefore, a coating film having an uneven thickness is formed on the object to be coated. The present invention has been made to solve the above problems, and an object thereof is to provide a coating tool that can apply a coating film having a uniform thickness without generating a stagnation portion in a manifold.

The coating tool of the present invention is a tool in which a stirring rod is attached to a cylindrical stirring rod so as to pass through the inside of a manifold and be rotatable about the central axis thereof.

More specifically, the present invention is an application tool including a main block having a manifold for accommodating a liquid therein, and a liquid supply portion and a liquid discharge portion which reach the manifold from a side surface of the main block, and a cylindrical stirring rod which is attached to the main block so as to pass through an inside of the manifold and to be rotatable about a center axis thereof.

The surface roughness of the stirring rod is preferably Rz25 or less.

The coating tool according to another aspect of the present disclosure includes a body block having a manifold for accommodating a liquid therein, a liquid supply portion communicating with a surface of the body block and the manifold, and a liquid discharge portion communicating with the surface of the body block and the manifold, and a stirring rod having a circular cross section across a predetermined region. The stirring rod is supported rotatably in the space forming the manifold.

Here, the stirring rod is formed to have a circular cross section in a predetermined region, which is required to be at least half the length of the stirring rod in the manifold. However, in the case where the influence on the progress of the liquid is limited, the liquid may have a different cross-sectional shape at the end portion or the like.

Further, the manifold may be formed to have a cross-sectional shape formed by straight lines and curved lines, such as a semicircular shape and a semi-elliptical shape. Further, the manifolds preferably have the same sectional shape in the longitudinal direction of the block.

Further, a part of the wall surface of the manifold and a part of the wall surface of the liquid outflow portion may be formed to be flush with each other.

Since the stirring rod provided in the manifold is cylindrical, the coating liquid in the manifold does not pulsate as in the conventional art, and a uniform coating film can be applied to the object to be coated.

Drawings

Fig. 1 is a perspective view of a coating tool according to an embodiment of the present invention.

Fig. 2 is an enlarged view a of fig. 1.

Fig. 3 is an exploded perspective view of the coating tool according to the embodiment of fig. 1.

Fig. 4 is a six-dimensional view of the coating tool according to the embodiment of fig. 1, in which (a) is a front view, (b) is a top view, (c) is a bottom view, (d) is a left view, and (e) is a right view.

Fig. 5 is an explanatory view showing a positional relationship between the manifold and the stirring rod in the coating tool according to the embodiment of fig. 1.

Fig. 6 is a cross-sectional view of the application tool according to the embodiment of fig. 1, the cross-sectional view being perpendicular to the longitudinal direction of the application tool and passing through the liquid supply unit 18.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The coating tool 10 of the present embodiment includes a 1 st block 1, a 2 nd block 2, a cylindrical stirring rod 3, two side sealing bodies 4, two oil seals 5, and two oil seal enclosing bodies 6. The 1 st block 1 and the 2 nd block 2 constitute a main body block of the coating tool 10.

The 1 st block 1 has a 1 st side 11, a 2 nd side 12 opposite to the 1 st side 11, a 3 rd side 13 and a 4 th side 14 joined to the 1 st side 11 and the 2 nd side 12, a 5 th side 15 opposite to the 3 rd side 13, and a 6 th side 16 opposite to the 4 th side 14. In the present embodiment, the 2 nd side 12 of the 1 st block 1 is formed into a rectangular shape elongated in the longitudinal direction (fig. 1).

Further, the 1 st side 11 faces in the opposite direction to the 2 nd side 12, and, as described later, is formed to have two planes parallel to the 2 nd side 12 and formed of a rectangle elongated in the longitudinal direction, and a semi-cylindrical surface sandwiched between the two planes and having the longitudinal direction as an axis.

The 3 rd side surface 13 is formed to be connected to the short sides of the 1 st side surface 11 and the 2 nd side surface 12, respectively, in one end portion in the longitudinal direction of the 1 st block 1. Similarly, the 5 th side surface 15 is formed so as to be connected to the shorter sides of the 1 st side surface 11 and the 2 nd side surface 12, respectively, at the other end portion in the longitudinal direction of the 1 st block 1. As shown in fig. 4 and 5, the 1 st side surface 11 and the 2 nd side surface 12 are perpendicular to the 3 rd side surface 13, and the 1 st side surface 11 and the 2 nd side surface 12 are perpendicular to the 5 th side surface 15.

The 4 th side surface 14 (fig. 5) is formed in a longitudinally elongated rectangular shape so as to be connected to one long side of the 1 st side surface 11 and one long side of the 2 nd side surface 12. The 6 th side surface 16 is inclined so as to be farther from the 4 th side surface 14 as it approaches the 1 st side surface 11, and is formed so as to be connected to the other long side of the 1 st side surface 11 and the other long side of the 2 nd side surface 12.

A recess 17 (hereinafter, referred to as a "manifold 17") is formed in the 1 st side surface 11, and the recess 17 is formed across the entire width direction (longitudinal direction) of the 1 st side surface 11 and has a semicircular cross section. The manifold 17 reaches the 3 rd side 13 and the 5 th side 15, and a part of each of the two sides is notched. That is, the manifold 17 is formed to penetrate from the 3 rd side surface 13 to the 5 th side surface 15. As shown in fig. 5 showing a cross section including the 3 rd side surface 13 in a state where the agitating bar 3 is supported, the agitating bar 3 is supported in the manifold 17 apart from the inner wall of the manifold 17 when viewed from the longitudinal end of the main body block. Further, as shown in fig. 6 which is a sectional view in a section perpendicular to the longitudinal direction of the body block, the agitating rods 3 and the manifold 17 have the positional relationship shown in fig. 5 not only at the longitudinal end portions of the body block but also from one end portion to the other end portion in the longitudinal direction of the body block.

The 1 st side surface 11 is divided into two parts with a manifold 17 interposed therebetween. Hereinafter, the portion closer to the 6 th side surface 16 is referred to as an "upper portion 11 a" and the other portion closer to the 4 th side surface 14 is referred to as a "lower portion 11 b" with reference to the manifold 17. The upper side portion 11a connected to the long side of the 6 th side 16 is formed in a rectangular shape parallel to the 2 nd side 12 and elongated in the longitudinal direction. The lower portion 11b connected to the longer side of the 4 th side 14 is formed in a rectangular shape which is parallel to the upper portion 11a and the 2 nd side 12 and elongated in the longitudinal direction. However, the upper portion 11a and the lower portion 11b are not formed on the same surface. Specifically, as shown in fig. 5, the upper portion 11a of the 1 st side surface 11 is formed to be recessed toward the 2 nd side surface 12 side with respect to the lower portion 11b of the 1 st side surface 11. In other words, the upper portion 11a of the 1 st side surface 11 is closer to the 2 nd side surface 12 than the lower portion 11b of the 1 st side surface 11 is to the 2 nd side surface 12. Thus, the upper portion 11a is formed to be slightly displaced toward the 2 nd side surface 12 side in the direction perpendicular to the surface, as compared with the lower portion 11 b. Therefore, the lower portion 11b of the 1 st side surface 11 constitutes a contact surface with the 2 nd block 2, while the upper portion 11a not contacting the 2 nd block 2 can constitute a flow path for discharging the coating liquid between the upper portion 11a and the surface of the 2 nd block 2 facing each other.

In order to supply the coating liquid to the manifold 17, the 2 nd side surface 12 is formed with a hole 18 (hereinafter, referred to as a "liquid supply portion 18") having one end opening to the 2 nd side surface 12 and the other end opening to the arc portion of the manifold 17, and having a circular cross section or the like. That is, the coating liquid flows in from the opening of the liquid supply unit 18, passes through the inside of the liquid supply unit 18, and flows into the manifold 17. The length of the 1 st side surface 11 in the height direction is longer than the length of the 2 nd side surface 12 in the height direction, and therefore the 6 th side surface 16 is inclined.

The 2 nd block 2 has almost the same shape as the 1 st block 1, but is different in that the manifold 17 is not formed, the side surface corresponding to the 1 st side surface 11 of the 1 st block 1 is the same surface, and the liquid supply portion 18 is not formed. In the 2 nd block 2, the side surface corresponding to the 1 st side surface 11 of the 1 st block 1 is a contact surface with the 1 st block 1.

If the 1 st block 1 and the 2 nd block 2 are engaged, the lower side portion 11b of the 1 st block 1 comes into contact with the abutment surface of the 2 nd block 2. On the other hand, the upper portion 11a of the 1 st block 1 does not abut on the abutment surface of the 2 nd block 2, but is opposed in parallel with a slight separation. Further, the inner wall surface forming the semi-cylinder between the upper portion 11a and the lower portion 11b is also separated from and opposed to the abutment surface of the 2 nd block 2.

As a result, an elongated gap (slit shape) is formed between the upper portion 11a of the 1 st side surface 11 and the 2 nd block 2, and the coating liquid is discharged from the gap 7 (hereinafter, referred to as "liquid outflow portion 7"). That is, in a cross section perpendicular to the advancing direction of the coating liquid, the liquid outflow portion 7 has an elongated rectangular flow path cross section surrounded by two parallel long sides having the same length as the longitudinal direction of the main body block and two parallel short sides having a distance in the normal direction of the upper side portion 11a and the lower side portion 11 b. Fig. 2 shows a pattern in which the liquid outflow portion 7 having such a rectangular flow path cross section is opened on the surface of the main block.

Further, as shown in fig. 5 and 6, in a section almost parallel to the advancing direction of the coating liquid, that is, in a section perpendicular to the longitudinal direction of the main body block, the liquid outflow portion 7 has an elongated flow path formed by a straight line extending a straight line constituting a diameter portion of the manifold 17 and connected to the surface of the main body block, and a straight line parallel to the straight line and connected from an arc portion of the manifold 17 to the surface of the main body block.

Therefore, a part of the contact surface formed by the flat surface of the 2 nd block 2 is in contact with the 1 st block 1, and the other part is a part of the wall surface of the manifold 17, and the other part is a part of the wall surface of the liquid outflow portion 7. Further, the lower portion 11b of the 1 st side surface 11 of the 1 st block 1 is in contact with the contact surface of the 2 nd block 2, the upper portion 11a forms the liquid outflow portion 7 between the contact surfaces with the 2 nd block 2, and the semi-cylindrical surface formed between the upper portion 11a and the lower portion 11b forms the manifold 17 between the contact surfaces with the 2 nd block 2.

As shown in fig. 3, the stirring rod 3 in the present embodiment is formed in an elongated cylindrical shape. As shown in fig. 5, when the stirring rod 3 is supported in the manifold 17, a gap is provided between the stirring rod 3 and the arc portion of the manifold 17, and a different gap is provided between the stirring rod 3 and the straight portion of the manifold 17. Further, as shown in fig. 5 and 6, the center of the semicircular cross section of the manifold 17 and the center of the circular cross section of the stirring rod 3 are set to the same height with reference to the side surface 14 of the 4 th side. That is, the stirring rod 3 is supported so that the center axis thereof is present on a plane that bisects the semicircular cross section of the manifold 17. Therefore, in a vertical cross section of the longitudinal direction of the main block and the manifold 17 or the central axis of the stirring rod 3 supported in parallel to the longitudinal direction, the manifold 17 and the stirring rod 3 are formed in line symmetry with respect to the same straight line.

Further, as shown in fig. 3, in the present embodiment, the end of the liquid supply portion 18 is opened at the center of the arc portion of the manifold 17, that is, at the portion of the arc portion of the manifold 17 where the distance from the stirring rod 3 is smallest. In other words, in a vertical cross section of the longitudinal direction of the main block and the manifold 17 or the central axis of the stirring rod 3 supported in parallel to the longitudinal direction, the manifold 17 forms a line symmetrical to a straight line passing through the stirring rod 3 and the liquid supply part 18 toward the opening of the manifold 17.

The 1 st block 1 and the 2 nd block 2 are integrated by a side sealing body 4 provided on the 3 rd side surface 13 and the 5 th side surface 15. A through hole 41 is formed in the side seal 4, and the stirring rod 3 is inserted through the through hole 41. The oil seal 5 is disk-shaped, and has a through hole formed in the center thereof through which the stirring rod 3 passes. The oil seal 5 is incorporated into an oil seal enclosing body 6 described later, and is fixed to the side seal body 4 together with the oil seal enclosing body 6.

The oil seal enclosing body 6 is plate-shaped and joined to the side seal body 4. The oil seal enclosing body 6 has a recess of the same shape as the oil seal 5 in one side surface thereof, and the oil seal 5 is accommodated in the recess when the oil seal enclosing body 6 is joined to the side surface sealing body 4. A bearing is provided in the oil seal-enclosing body 6 so as to be connected to the recess, and the stirring rod 3 is supported through the bearing. The stirring rod 3 is disposed inside the manifold 17 and is attached to be rotatable about the center axis thereof. Both ends of the stirring rod 3 shown in fig. 4 protrude from the oil seal-enclosing body 6. The stirring rod 3 can be axially rotated by connecting one end of the stirring rod 3, which greatly protrudes from the oil seal enclosing body 6, to a driving source (not shown) such as a motor.

(operation and Effect of the coating tool 10 according to the first embodiment)

Next, the effects of the above embodiment will be described. First, a pump (not shown) is connected to the liquid supply unit 18 to start supplying the coating liquid to the coating tool 10. As shown in fig. 1, the application tool 10 according to the present embodiment includes a liquid supply portion 18 and a hole 19 for extracting air. If the supply of the coating liquid is continued, the manifold 17, the liquid supply portion 18 as a flow path for supplying the coating liquid to the manifold 17, and the liquid outflow portion 7 for discharging the coating liquid from the manifold 17 are filled with the coating liquid after a while. Further, the air filled in the manifold 17 and the garbage remaining in the manifold 17 are discharged together with the coating liquid from the hole 19 for drawing the air, and then the hole 19 is plugged by a valve or a plug. At the same time, the stirring rod 3 is rotated clockwise in fig. 5. Since the stirring rod 3 having a cylindrical shape and being rotatable is disposed inside the manifold 17, if the stirring rod 3 is rotated by an external driving source, the coating liquid in the manifold 17 can be stirred. Therefore, the increase in viscosity accompanying the decrease in velocity can be suppressed, and the retention of the liquid in the manifold can be suppressed.

The coating liquid supplied from the liquid supply portion 18 by the pump flows into the manifold 17 from the circular arc portion of the manifold 17. Since the stirring rod 3 rotates clockwise in fig. 5, the coating liquid also moves clockwise within the manifold 17. Specifically, the coating liquid that advances toward the central axis of the stirring rod 3 in the liquid supply portion 18 and flows into the manifold 17 first advances in a direction away from the liquid outflow portion 7 (downward direction of the paper surface in fig. 5) along the arc portion. Here, the liquid supply portion 18 is open at the center of the arc portion, that is, at a position closest to the stirring rod 3, and is therefore susceptible to the influence of the flow by the stirring rod 3. Further, since the coating liquid in the liquid supply portion 18 advances toward the center axis of the stirring rod 3, the coating liquid can be promoted to advance in a direction (downward direction on the paper surface in fig. 5) away from the liquid outflow portion 7 as a rotation tangential direction. Further, since the manifold 17 and the main portion of the liquid outflow portion 7 according to the present embodiment have the same shape regardless of the position in the longitudinal direction of the main body block, the movement of the coating liquid in the longitudinal direction is restricted.

Thereafter, the coating liquid passing through the gap between the inner wall surface of the 1 st block 1 forming the arc portion and the stirring rod 3 is advanced in the direction of the liquid outflow portion 7 by the resistance of the contact surface of the 2 nd block 2. After that, the coating liquid passes through the gap between the contact surface of the 2 nd block 2 and the stirring rod 3. Here, the rotation tangential direction of the stirring rod 3 in the position closest to the 2 nd block 2 coincides with the advancing direction of the coating liquid in the liquid outflow portion 7. That is, when the coating liquid passes through the gap between the contact surface of the 2 nd block 2 and the stirring rod 3, the stirring rod 3 is likely to receive a force (upward force in fig. 5) in a direction toward the liquid outflow portion 7 in parallel with the contact surface. Thereafter, at least a part of the coating liquid flows into the liquid outflow portion 7, and advances in the liquid outflow portion 7 in parallel with the abutment surface. At this time, the liquid outflow portion 7 and the linear portion of the manifold 17 are connected by the same plane contact surface of the 2 nd block 2. This can facilitate the coating liquid to advance parallel to the contact surface. The coating liquid is discharged to the outside after a while, and is applied to the workpiece.

The inventors of the present application have focused on the following situations: when a member having a projection such as a blade is used to stir the coating liquid, pulsation or the like is generated, and therefore, the pressure distribution of the coating liquid in time or position becomes large, which becomes a factor of variation in the thickness of the coating film. Since the stirring rod 3 according to the present embodiment is formed in a cylindrical shape without forming projections or the like, an excessive flow of the coating liquid is not generated as compared with the case of using a stirring rod formed with projections or the like. As a result, a coating film having a uniform thickness can be applied to the object to be coated without generating a retention portion in the manifold 17 as compared with the conventional case. The surface roughness of the stirring rod is preferably Rz25 or less. When the surface roughness is within this numerical range, pulsation of the coating liquid can be further suppressed, so that a coating film having a more uniform thickness can be formed.

The present invention has been described above by taking one embodiment as an example. The application tool 10 according to the present invention can be used to apply a copper foil serving as a positive electrode of a battery or an aluminum foil serving as a negative electrode. Further, the coating composition can be used for various applications such as coating of a thin film that melts during firing in the production of a laminated ceramic capacitor. In addition, the functional film can be produced by applying the coating liquid to the thin film, drying the coating liquid, and separating the coating liquid from the thin film. In particular, the inventors of the present invention have found that when a slurry (a product obtained by mixing solid particles with a liquid (clear water, sea water, chemicals, etc.) or dispersing or suspending the solid particles in a liquid) is used as a coating liquid, the effect of suppressing separation of solid components is exhibited. That is, since a slurry having a complicated composition such as a highly functional film contains a large amount of solid components, if a conventional coating tool which is not sufficiently stirred is used, the solid components are separated from the liquid, and the ratio of the solid components contained in the liquid is not uniform at each position of the slit-shaped outlet, which causes a problem that the clay characteristics are changed. However, according to the coating tool of the present embodiment, even when a slurry containing solid particles in a liquid is used as a coating liquid, since the coating liquid can be applied from an outlet having a longitudinal direction while stirring the coating liquid in a manifold, it is possible to suppress variation in clay characteristics according to the position in the longitudinal direction and realize coating with high uniformity, as compared with the conventional art. The present invention is not limited to the above embodiments. That is, various modifications can be made without departing from the basic technical idea of the present invention that a stirring rod having a cylindrical shape or a circular cross section is disposed in a manifold. For example, in the above embodiment, the manifold 17 is formed to have the same width as the 1 st block 1, but the manifold may be shorter than the 1 st block. The shape of the liquid outflow portion may be appropriately changed depending on the thickness of the target coating film, the type of the coating liquid to be used, and the like, and may be a shape other than the slit shape in the above embodiment, for example. Further, a plurality of liquid outflow portions may be formed according to the application. For example, a plurality of slit-shaped liquid discharge portions may be formed separately from each other in the longitudinal direction of the main body block. In this case, it is preferable that the manifolds have the same cross-sectional shape at least in the region where the liquid outflow portion is formed. Further, a plurality of liquid supply portions may be formed. For example, a plurality of liquid supply portions may be formed at both ends in the longitudinal direction of the main body block, and a hole for extracting air may be formed at the center in the longitudinal direction.

In addition, the shape of the manifold can be variously modified. For example, the circular arc portion may be formed by an ellipse, a quadratic curve, another curve, or a curve and a straight line. For example, simulation may be performed on a plurality of cross-sectional shapes to select the cross-sectional shape that minimizes pressure fluctuation or the like. However, the wall surface forming the liquid outflow portion and a part of the wall surface of the manifold connected thereto are integrally formed on the same plane as the contact surface of the 2 nd block 2 of the coating tool 10 according to the present embodiment, and the stirring rod is further brought close, so that the coating liquid can be more stably discharged. Further, the body block may be integrally formed using wire electric discharge (wire electric discharge) or a die. The stirring rod or the like may be detachably attached to the main body block or may be fixed to the main body block. Further, the number of the liquid supply portions may be 1 (for example, the center portion in the longitudinal direction), and holes for air extraction may be provided at both end portions, or 3 or more liquid supply portions may be provided.

Description of the symbols

1 st block

11 1 st side

11a upper part of the 1 st side

11b lower part of the 1 st side

12 nd side 2

13 rd side surface

14 th side of

15 th side of 5

16 th side of the surface

17 manifold

18 liquid supply part

19 holes

2 nd block

3 stirring rod

4 side sealing body

5 oil seal

6 oil seal enclosing body

7 liquid outflow part

Claims

1. A coating tool is provided with:

a body block; and

a cylindrical stirring rod is arranged on the inner wall of the stirring rod,

the main block body has a manifold for accommodating liquid therein, and a liquid supply portion and a liquid outflow portion which reach the manifold from a side surface of the main block body,

the stirring rod passes through the inside of the manifold and is rotatably mounted to the main block around the central axis thereof,

the surface roughness of the stirring rod is Rz25 or less.

2. The coating tool of claim 1 wherein,

the main body block is composed of a 1 st block body and a 2 nd block body,

the liquid outflow part is formed at the joint part of the 1 st block and the 2 nd block,

the liquid supply part is formed on the 1 st block body,

the manifold is formed as a recessed portion in a side surface of the 1 st block which is in contact with the 2 nd block, the recessed portion being formed across the entire width direction of the side surface,

the coating tool has a through hole for passing the stirring rod, and further has a side seal body joined to the 1 st block body and the 2 nd block body,

an oil seal is arranged at the front end of the stirring rod, the oil seal is provided with a through hole or a recess in which the front end part of the stirring rod is embedded,

the coating tool further includes an oil seal enclosing body having a recess for fitting the oil seal and having a thickness equal to or deeper than that of the oil seal, and a bearing for supporting the stirring rod, and joined to the side sealing body.

3. The coating tool of claim 2, wherein,

the liquid outflow portion is formed in a slit shape extending across the entire width direction of the 1 st block and the 2 nd block.

4. A coating tool is provided with:

a body block; and

the stirring rod is used for stirring the mixture,

a manifold for accommodating liquid therein, a liquid supply portion communicating with the surface of the main block and the manifold, and a liquid discharge portion communicating with the surface of the main block and the manifold are formed in the main block,

the stirring rod has a circular cross section across a predetermined region and is supported so as to be rotatable in a space forming the manifold,

in a cross section perpendicular to the longitudinal direction of the stirring rod,

the manifold is formed in a semicircular or semi-elliptical shape due to the inner wall of the body block,

the stirring rod is formed into a circular shape separated from the inner wall of the main body block and is arranged in the manifold,

the liquid outflow portion is formed by a straight line portion extending a straight line forming the diameter portion of the semicircle or the semiellipse and connected to the surface of the main body block, and a straight line portion parallel to and opposed to the straight line portion and connecting the arc portion of the semicircle or the semiellipse and the surface of the main body block,

the end of the liquid supply portion is open at the center of the arc portion of the manifold, that is, at the portion of the arc portion of the manifold where the distance from the stirring rod is smallest.

5. The coating tool of claim 4,

the stirring rods are formed to have the same circular cross section across a designated area.

6. The coating tool of claim 4,

the liquid supply portion opens to the circular arc portion of the manifold,

the stirring rod is formed to be rotatable so that a rotation tangent line in a position close to the diameter portion is parallel to an advancing direction of the liquid in the liquid outflow portion, so that the liquid supplied from the circular arc portion into the manifold flows out from the liquid outflow portion to the outside through a gap between the stirring rod and the diameter portion.