WO2023032852A1 - Extrusion die, coating device, and coating film manufacturing method - Google Patents

Abstract

Provided are an extrusion die, a coating device equipped with the extrusion die, and a coating-film manufacturing method utilizing the coating device. The extrusion die is used for a method of stripe-coating of coating fluid that exhibits thixotropic properties, wherein the extrusion die: is provided with two lips and a plurality of spacers clamped between the two lips; at least includes a plurality of slits that are lined up lengthwise and that are demarcated by the two lips and the plurality of spacers, one or a plurality of manifolds that are connected to one or a plurality of the slits, and a fluid-feed port that supplies coating fluid to the one or plurality of manifolds; and has a plurality of fluid-feed ports for each manifold.

Description

Extrusion die, coating device, and coating film manufacturing method

The present disclosure relates to an extrusion die, a coating device, and a coating film manufacturing method.

The following method is known as a method for efficiently producing a coating film having a narrow width (for example, a width of 200 mm or less) in a roll-to-roll continuous process.
That is, the coating liquid is applied in stripes with an extrusion die on a wide base material that is continuously conveyed, and after drying the resulting striped coating liquid film, the unfinished space between adjacent coating films is removed. This is a method of obtaining a plurality of strips of coating film by cutting the coated portion (that is, the exposed portion of the substrate).

Extrusion die used for stripe coating the coating solution, for example, disclosed in FIG. 5 of JP-A-2001-006663, and FIG. It is

In the extrusion die described in JP-A-2001-006663 and JP-A-2015-191096, a plurality of striped coating liquid films are formed, but the width direction in one coating liquid film is In some cases, thickness unevenness may occur between the substrates, and thickness unevenness may occur between a plurality of coating liquid films arranged in the width direction of the substrate. This is a significant problem when a coating liquid exhibiting thixotropic properties is strip-coated using an extrusion die.

Therefore, the problem to be solved by one embodiment of the present disclosure was made in view of the above circumstances, and a coating liquid film formed by using a coating liquid exhibiting thixotropic properties in a stripe coating method An object of the present invention is to provide an extrusion die that is excellent in thickness uniformity in the width direction.
Another problem to be solved by another embodiment of the present disclosure is to provide a coating apparatus equipped with the extrusion die.
Furthermore, a problem to be solved by another embodiment of the present disclosure is to provide a method for producing a coating film using the above coating apparatus.

Means for solving the above problems include the following embodiments.
<1> An extrusion die used in a method of strip coating a coating liquid exhibiting thixotropic properties,
comprising two lips and a plurality of spacers sandwiched between the two lips;
a plurality of longitudinally aligned slits defined by two lips and a plurality of spacers, one or more manifolds connected to the one or more slits, and coating to the one or more manifolds At least a liquid supply port that supplies liquid,
Extrusion die with multiple feed ports per manifold.
<2> At least part of the plurality of liquid supply ports is sandwiched between two straight lines extending in the circumferential direction along both width direction edges of the spacer between adjacent slits on the surface defining the manifold. The extrusion die according to <1>, provided in the region R1.
<3> The extrusion die according to <2>, wherein the one or more liquid supply ports provided in the region R1 are provided at positions facing the spacers in the same region R1.
<4> At least part of the plurality of liquid supply ports is provided in a region R2 sandwiched between straight lines extending in the circumferential direction along both edges in the width direction of the connecting portion with the slit on the surface defining the manifold. The extrusion die according to <1>.
<5> The extrusion die according to <4>, wherein the one or more liquid supply ports provided in the region R2 are provided at positions facing the openings of the slits in the same region R2.
<6> The extrusion die according to any one of <2> to <5>, wherein a part of the plurality of liquid supply ports is provided on at least one of both longitudinal ends of the manifold.
<7> the extrusion die according to any one of <1> to <6>;
a plurality of liquid supply pipes for supplying the coating liquid through the liquid supply port to the manifold of the extrusion die;
coating equipment.
<8> The coating apparatus according to <7>, wherein each of the plurality of liquid supply pipes is provided with a static mixer.
<9> The coating apparatus according to <7> or <8>, wherein each of the plurality of liquid supply pipes is provided with a valve.
<10> A coating comprising a step of applying a coating liquid exhibiting thixotropic properties using the coating apparatus according to any one of <7> to <9> on a continuously conveyed substrate. A method for manufacturing a coating.

According to one embodiment of the present disclosure, there is provided an extrusion die that is used in a method of stripe coating a coating liquid exhibiting thixotropic properties and that is excellent in thickness uniformity in the width direction of the formed coating liquid film. .
Further, according to another embodiment of the present disclosure, there is provided a coating apparatus equipped with the extrusion die described above.
Furthermore, according to another embodiment of the present disclosure, there is provided a method for producing a coating film using the above coating apparatus.

FIG. 1 is a schematic perspective view showing an example of an extrusion die according to this embodiment. FIG. 2 is a schematic cross-sectional view of an example of the extrusion die shown in FIG. 1 taken along the length direction (eg, direction Y) at the center of the manifold. FIG. 3 is a QQ sectional view of the extrusion die shown in FIG. FIG. 4 is a schematic cross-sectional view of another example of the extrusion die according to the present embodiment, taken along the longitudinal direction (for example, direction Y) at the central portion of the manifold. FIG. 5 is a schematic cross-sectional view of another example of the extrusion die according to the present embodiment, cut along the length direction (eg, direction Y) at the central portion of the manifold. FIG. 6 is an RR sectional view of the extrusion die shown in FIG. FIG. 7 is a schematic cross-sectional view of another example of the extrusion die according to the present embodiment, cut along the length direction (eg, direction Y) at the central portion of the manifold. FIG. 8 is a schematic cross-sectional view of another example of the extrusion die according to the present embodiment, cut along the length direction (eg, direction Y) at the central portion of the manifold. FIG. 9 is a schematic cross-sectional view of another example of the extrusion die according to the present embodiment, cut along the length direction (eg, direction Y) at the central portion of the manifold. FIG. 10 is a schematic side view showing an example when the coating liquid is discharged from the extrusion die according to this embodiment. FIG. 11 is a schematic cross-sectional view of an example of a conventional extrusion die cut along the length direction (eg, direction Y) at the center of the manifold. FIG. 12 is a schematic cross-sectional view of an example of a conventional extrusion die cut along the length direction (eg, direction Y) at the center of the manifold. FIG. 13 is a schematic diagram of a case in which four strips of the coating film M formed on the base material B are cut along the width direction of the base material in each of Examples 1 to 5. FIG. FIG. 14 is a schematic diagram of a case in which the four coating films M formed on the substrate B are cut along the width direction of the substrate in each of Examples 5 to 9 and Comparative Examples 1 and 2. is.

An embodiment of the extrusion die will be described below. However, the present disclosure is by no means limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the purpose of the present disclosure.

When describing the embodiments of the present disclosure with reference to the drawings, descriptions of overlapping components and reference numerals in the drawings may be omitted. Components shown using the same reference numerals in the drawings mean the same components. The dimensional ratios in the drawings do not necessarily represent the actual dimensional ratios.

In the description of the embodiments of the present disclosure, one direction in the width direction of the extrusion die is referred to as direction X, one direction in the length direction of the extrusion die and in the length direction of the manifold is referred to as direction Y, and the extrusion die Let Z be one of the height directions. Direction X, direction Y, and direction Z are orthogonal to each other.
Further, in the description of the embodiments of the present disclosure, the length direction of the extrusion die corresponds to the coating width direction of the coating liquid.

In the description of the embodiments of the present disclosure, the width direction of the spacer and the width direction of the connection portion with the slit in the plane defining the manifold are the direction Y, which is one direction in the length direction of the extrusion die and the manifold. in the same direction.
In the description of the embodiments of the present disclosure, the surface that defines the manifold refers to the surface that defines the boundary of the space called the manifold, and includes a portion of the lip, a portion of the spacer, and an optional stopper. , a boundary surface between the opening of the slit and the slit, and a boundary surface between the opening of the liquid supply port and the liquid supply port.

In the present disclosure, a numerical range indicated using "to" means a range including the numerical values before and after "to" as the minimum and maximum values, respectively.
In the numerical ranges described step by step in the present disclosure, upper or lower limits described in a certain numerical range may be replaced with upper or lower limits of other numerical ranges described step by step. In addition, in the numerical ranges described in the present disclosure, upper or lower limits described in a certain numerical range may be replaced with values shown in Examples.
The elements in the figures shown in this disclosure are not necessarily to scale, and emphasis is placed on clearly illustrating the principles of the disclosure, and some emphasis is placed on them.
Moreover, in each drawing, the same code|symbol is attached|subjected to the component which has the same function, and the overlapping description is abbreviate|omitted.

In the description of the embodiments of the present disclosure, "coating liquid film" refers to a film before or during drying, and "coating film" refers to a film after drying.
In the description of the embodiments of the present disclosure, the “width direction” of the base material, the coating liquid film, and the coating film refers to the longitudinal direction of any of the long base material, the coating liquid film, and the coating film. It points in the direction orthogonal to

In the present disclosure, a combination of two or more preferred forms or aspects is a more preferred form or aspect.

≪Extrusion die≫
As described above, in an extrusion die that performs stripe coating, if a coating liquid exhibiting thixotropic properties is used, in a plurality of coating liquid films formed in stripes, one coating liquid film In some cases, thickness unevenness may occur in the width direction of the substrate, and thickness unevenness may occur between a plurality of coating liquid films arranged in the width direction of the substrate.
Here, "thixotropic property" refers to a state in which the viscosity is relatively high in a steady state (for example, a state in which no shear stress is applied), and when shear stress is applied, the viscosity decreases, and the shear stress decreases. It exhibits the property of returning to its original viscosity when the application is stopped. Specifically, as a coating liquid exhibiting thixotropic properties, for example, in the viscosity curve obtained by viscosity measurement with a rheometer, the viscosity curve when the shear rate is decreased is lower than the viscosity curve when the shear rate is increased. A liquid located on the viscous side.
The above thickness unevenness is caused by contact between the walls of the manifold and the slit and the coating liquid in the flow path when the coating liquid exhibiting thixotropic properties flows inside the die, particularly from the manifold to the slit. A shear stress is applied to the coating liquid. In this case, it is presumed that the difference in shear stress applied to the coating liquid according to the distance from the wall surface causes a difference in the viscosity of the coating liquid discharged from the slit. In particular, the coating liquid that comes into contact with the wall surfaces at both ends in the longitudinal direction of the manifold and flows into the slit has a relatively low viscosity, and the coating liquid becomes thicker at both ends than at the center in the width direction. It turns out that there is a trend. In a die that performs stripe coating, the flow path of the coating liquid flowing from the manifold to the slit is complicated, and the distance from the liquid supply port of the manifold to the slit is not uniform. There is a tendency.

When the inventors of the present invention investigated the problem of the thickness unevenness, it was found that a coating liquid exhibiting thixotropic properties was obtained by providing a plurality of liquid supply ports for supplying the coating liquid to the manifold for each manifold. The present inventors have found that the thickness uniformity in the width direction of the coating liquid film to be formed can be improved even by using such a material, and thus have reached the configuration of the extrusion die according to the present embodiment.

The extrusion die according to the present embodiment (hereinafter also simply referred to as "die") is an extrusion die used in a method of stripe coating a coating liquid exhibiting thixotropic properties, and comprises two lips and , a plurality of spacers sandwiched between the two lips, a plurality of longitudinally aligned slits defined by the two lips and the plurality of spacers; It includes at least a plurality of manifolds and liquid supply ports for supplying a coating liquid to one or more manifolds, and one manifold has a plurality of liquid supply ports.

In the die according to the present embodiment, one manifold is configured to have a plurality of liquid supply ports, so that a coating liquid exhibiting thixotropic properties is subjected to shear applied in the flow channel in the die. Differences in stress and shear stress hysteresis can be reduced. As a result, it is presumed that the difference in the viscosity of the coating liquid when discharged from the die is reduced, and the thickness uniformity in the width direction of the coating liquid film is obtained.
Since the thickness unevenness in the coating liquid film remains even in the coating film obtained by drying the coating liquid film, the thickness uniformity in the width direction of the coating liquid film described above is the thickness of the coating film. You can check it by measuring.

Here, the extrusion die described in JP-A-2001-006663 and JP-A-2015-191096 does not have a configuration having a plurality of liquid supply ports per manifold, and exhibits thixotropy. When a coating liquid is used, it is difficult to obtain thickness uniformity in the width direction of the formed coating liquid film.

An extrusion die according to this embodiment will be described below with reference to the drawings.
Here, FIG. 1 is a schematic perspective view showing an example of the extrusion die according to the present embodiment, showing a state in which the second lip 20 portion is seen through. FIG. 2 is a schematic cross-sectional view of an example of the extrusion die shown in FIG. 1 cut along the length direction (for example, direction Y) at the central portion of the manifold. FIG. 2 shows the first lip 10 side. Further, FIG. 3 is a QQ sectional view of the extrusion die shown in FIG.

As shown in FIG. 1, the die 100 includes a first lip 10, a second lip 20, and a spacer 32 sandwiched between the first lip 10 and the second lip 20. It is
Also, as shown in FIGS. 1 and 2, the die 100 has a longitudinal (i.e., directional Y), two manifolds 40 connected to the four slits 30, and four liquid supply ports 50 for supplying the coating liquid to the two manifolds 40 are defined. The connecting portion between the manifold 40 and the slit 30 is the opening 34 of the slit 30 , and the connecting portion between the manifold 40 and the liquid supply port 50 is the opening 52 of the liquid supply port 50 . More specifically, a first lip 10, a second lip 20 and five spacers 32 define a slit 30, and a first lip 10, a second lip 20 and three plugs 38 define a manifold. 40 are defined.
Thus, in the die 100, two slits are connected per manifold and two liquid supply ports are provided per manifold.

In the die 100 shown in FIG. 1, the four liquid supply ports 50 are all along the width direction both edges of the connection portion with the slit 30 (that is, the opening 34 of the slit 30) on the surface defining the manifold 40. It is provided in a region R2 sandwiched between straight lines extending in the circumferential direction. Further, the die 100 has four regions R2, and one liquid supply port 50 is provided in each of the four regions R2. The four liquid supply ports 50 in the die 100 are sandwiched between two straight lines extending in the circumferential direction along both width direction edges of the spacer 32 between adjacent slits 30 on the surface defining the manifold 40. It can also be said that it is not provided in the region R1.
Here, the region R2 does not include the connection portion with the slit (specifically, the opening 34 of the slit 30 shown in FIG. 2), and the region R1 includes a surface formed by the spacer (specifically does not include the surface 36 formed by the spacer 32, shown in FIG. In FIG. 1, the region R2 refers to a region excluding the connection portion with the slit (specifically, the opening 34 of the slit 30 shown in FIG. 2) from the cylindrical region indicated by the dashed line. . In FIG. 1, the region R1 is the surface formed by the spacer (specifically, the surface 36 formed by the spacer 32 shown in FIG. 2) from the cylindrical region indicated by the dashed line. refers to the area excluding

Further, as shown in FIGS. 1 and 2, in the die 100, the four liquid supply ports 50 provided in the region R2 are all located at positions facing the openings 34 of the slits 30 in the same region R2. is provided. Further, as shown in FIG. 3 , in the die 100 , the opening 34 of the slit 30 and the opening 52 of the liquid supply port 50 face each other inside the manifold 40 . In other words, it can be said that all four liquid supply ports 50 in the die 100 open toward the opening of the slit 30 . 3, a straight line 30L passing through an intermediate point 34C of a straight line 34L indicating the opening surface of the opening 34 of the slit 30 and perpendicular to the straight line 34L and the opening 52 of the liquid supply port 50 A straight line 50L that passes through the midpoint 52C of the straight line 52L indicating the opening surface and is orthogonal to the straight line 52L is connected at the intersection point P to form a straight line. It can be seen that the portion 52 and , are facing each other. Here, the angle θ1 formed by the straight line 30L and the straight line 50L is 180° with the straight line 30L as a reference.

As shown in FIG. 3, the die 100 has a mode in which the opening 34 of the slit 30 faces the opening 52 of the liquid supply port 50, but it is not limited to this mode. For example, in the die 100, if the opening 52 of the liquid supply port 50 can be provided in a desired shape and size, or if the installation of the liquid supply port 50 and its opening 52 can be used to manufacture the die 100 The opening 52 of the liquid supply port 50 may be placed at any position within the region R2 as long as it is permitted. As an example, the angle θ1 formed by the straight line 30L and the straight line 50L shown in FIG. You can choose any angle.
In the present disclosure, "the liquid supply port is provided at a position facing the opening of the slit" means that the positional relationship between the opening of the slit and the opening of the liquid supply port is a straight line shown in FIG. The angle θ1 formed by the line 30L and the straight line 50L satisfies 90° to 270° with the straight line 30L as a reference.

Next, another example of the extrusion die according to this embodiment will be described with reference to FIGS. 4 to 9. FIG. 4 to 9 are schematic diagrams of another example of the extrusion die according to the present embodiment, cut along the length direction (eg, direction Y) at the center of the manifold, similar to FIG. It is a sectional view. 4 to 9 show the first lip 10 side.

The die 100A shown in FIG. 4 has a first lip 10, a second lip (not shown), five spacers 32, and two plugs 38 as in FIG. It defines four slits 30 arranged in the direction Y), one manifold 40 connected to the four slits 30, and two liquid supply ports 50 for supplying the coating liquid to the one manifold 40. .
Thus, in the die 100A, one manifold is connected to four slits, and one manifold has two liquid supply ports.
In addition, in the die 100A, the two liquid supply ports 50 are both circumferentially along both edges in the width direction of the connection portion with the slit 30 (that is, the opening portion 34 of the slit 30) on the surface defining the manifold 40. It is provided in a region R2 sandwiched between straight lines extending in the direction. In the die 100A, the two liquid supply ports 50 provided within the region R2 are both provided at positions facing the openings 34 of the slits 30 within the same region R2.
Also in the die 100</b>A, the opening 34 of the slit 30 and the opening 52 of the liquid supply port 50 face each other in the manifold 40 . In other words, it can be said that all four liquid supply ports 50 in the die 100A open toward the opening of the slit 30 .

The die 100B shown in FIG. 5 has a first lip 10, a second lip (not shown), five spacers 32, and two plugs 38, similar to FIG. It defines four slits 30 arranged in the direction Y), one manifold 40 connected to the four slits 30, and two liquid supply ports 50 for supplying the coating liquid to the one manifold 40. .
Thus, in the die 100B, four slits are connected to one manifold, and one manifold has two liquid supply ports.
In addition, both of the two liquid supply ports 50 in the die 100B extend in the circumferential direction along both width direction edges of the spacer 32 between the adjacent slits 30 on the surface defining the manifold 40. It is provided in a region R1 sandwiched between two straight lines. In the die 100B, both of the two liquid supply ports 50 provided within the region R1 are provided at positions facing the spacers 32 within the same region R1.

Further, as shown in FIG. 6, in the die 100B, the surface 36 formed by the spacer 32 and the opening 52 of the liquid supply port 50 face each other in the manifold 40 . In other words, it can be said that both of the two liquid supply ports 50 in the die 100B open toward the surface 36 formed by the spacer 32 . Here, FIG. 6 is an RR sectional view of the extrusion die shown in FIG. 6, a straight line 32L that passes through the midpoint 36C of the surface 36 formed by the spacer 32 and is orthogonal to the surface 36, and a straight line that indicates the opening surface of the opening 52 of the liquid supply port 50. A straight line 50L that passes through the midpoint 52C of the straight line 52L and is perpendicular to the straight line 52L is connected at the intersection point P to form a straight line. , are in direct opposition to each other. Here, the angle θ2 formed by the straight line 32L and the straight line 50L is 180° with the straight line 32L as a reference.
Here, surface 36 formed by spacers 32 is part of the surface defining manifold 40 .

As shown in FIG. 6, the die 100B has a mode in which the surface 36 formed by the spacer 32 and the opening 52 of the liquid supply port 50 face each other, but it is not limited to this mode. . For example, in the die 100B, if the opening 52 of the liquid supply port 50 can be provided in a desired shape and size, or if the installation of the liquid supply port 50 and its opening 52 can be used to manufacture the die 100B. The opening 52 of the liquid supply port 50 may be placed at any position within the region R1 as long as it is permitted. As an example, the angle θ2 formed by the straight line 32L and the straight line 50L shown in FIG. You can choose any angle.
In the present disclosure, "the liquid supply port is provided at a position facing the spacer" means that the positional relationship between the surface of the manifold blocked by the spacer and the opening of the liquid supply port is shown in FIG. The angle θ2 formed by the straight line 32L and the straight line 50L may satisfy 90° to 270° with the straight line 32L as the reference.

The die 100C shown in FIG. 7 has a first lip 10, a second lip (not shown), five spacers 32, and two plugs 38, similar to FIG. It defines four slits 30 arranged in the direction Y), one manifold 40 connected to the four slits 30, and three liquid supply ports 50 for supplying the coating liquid to the one manifold 40. .
Thus, in the die 100C, one manifold is connected to four slits, and one manifold has three liquid supply ports.
In addition, the three liquid supply ports 50 in the die 100C are arranged along the width direction both edges of the connection portion with the slit 30 (that is, the opening portion 34 of the slit 30) of the surface defining the manifold 40. It is provided in a region R2 sandwiched by straight lines extending to . In the die 100C, the three liquid supply ports 50 provided within the region R2 are all provided at positions facing the openings 34 of the slits 30 within the same region R2.
Also in the die 100</b>C, the opening 34 of the slit 30 and the opening 52 of the liquid supply port 50 face each other in the manifold 40 . In other words, it can be said that all of the three liquid supply ports 50 in the die 100</b>C open toward the opening of the slit 30 .

The die 100D shown in FIG. 8 has a first lip 10, a second lip (not shown), five spacers 32, and two plugs 38 as in FIG. It defines four slits 30 arranged in the direction Y), one manifold 40 connected to the four slits 30, and two liquid supply ports 50 for supplying the coating liquid to the one manifold 40. . Furthermore, a part of both ends (that is, two plugs 38) of the manifold 40 in the length direction (that is, the direction Y) is open, and the coating liquid is supplied to the manifold 40 on both ends. A liquid supply port 54 is provided.
Thus, in the die 100D, four slits are connected to one manifold, and a total of four liquid supply ports 50 and 54 are provided in one manifold.
In addition, both of the two liquid supply ports 50 in the die 100D extend in the circumferential direction along both width direction edges of the spacer 32 between the adjacent slits 30 on the surface defining the manifold 40. It is provided in a region R1 sandwiched between two straight lines. In the die 100B, the two liquid supply ports 50 provided within the region R1 are both located in the same region R1.
It is provided at a position facing the spacer 32 inside.
In addition, in the die 100D, the surface 36 formed by the spacer 32 and the opening 52 of the liquid supply port 50 face each other in the manifold 40 . In other words, it can be said that both of the two liquid supply ports 50 in the die 100</b>D open toward the surface closed by the spacer 32 . Also, the openings 56 of the two liquid supply ports 54 face each other.

The die 100E shown in FIG. 9 has a first lip 10, a second lip (not shown), five spacers 32, and two plugs 38, similar to FIG. It defines four slits 30 arranged in the direction Y), one manifold 40 connected to the four slits 30, and three liquid supply ports 50 for supplying the coating liquid to the one manifold 40. . Furthermore, a part of both ends (that is, two plugs 38) of the manifold 40 in the length direction (that is, the direction Y) is open, and the coating liquid is supplied to the manifold 40 on both ends. A liquid supply port 54 is provided.
Thus, in the die 100E, four slits are connected to one manifold, and a total of five liquid supply ports 50 and 54 are provided to one manifold.
In addition, the three liquid supply ports 50 in the die 100E are arranged in the circumferential direction along both edges in the width direction of the connection portion with the slit 30 (that is, the opening portion 34 of the slit 30) on the surface defining the manifold 40. It is provided in a region R2 sandwiched by straight lines extending to . In the die 100E, the three liquid supply ports 50 provided within the region R2 are all provided at positions facing the openings 34 of the slits 30 within the same region R2.
Also in the die 100E, the opening 34 of the slit 30 and the opening 52 of the liquid supply port 50 face each other inside the manifold 40 . In other words, it can be said that all three liquid supply ports 50 in the die 100E open toward the opening of the slit 30 . Also, the openings 56 of the two liquid supply ports 54 face each other.

Although the die having four slits has been described above, these are only examples of embodiments. , the number of liquid supply ports, the opening direction of the liquid supply ports, etc., are determined by the size and thickness of the coating liquid film (or coating film) to be formed, the allowable amount of thickness unevenness in the width direction of the coating liquid film, etc. It can be determined accordingly.
For example, although FIGS. 8 and 9 show the dies 100D and 100E having the liquid supply ports 54 that are open at both longitudinal ends of the manifold 40, the liquid supply ports 54 are opened at both longitudinal ends of the manifold 40. It may be an aspect in which one side is opened. However, from the viewpoint of improving the thickness uniformity in the width direction of the coating liquid film, it is preferable that the manifold is opened at both ends in the length direction.

As a preferred aspect of the die according to the present embodiment, at least a part of the plurality of liquid supply ports is circumferentially along both width direction edges of the spacer between adjacent slits on the surface defining the manifold. At least a part of the plurality of liquid supply ports is provided in a region R1 sandwiched between two extended straight lines, and at least a part of the plurality of liquid supply ports is along both edges in the width direction of the connection portion with the slit on the surface defining the manifold. There is also a mode in which it is provided in a region R2 sandwiched between straight lines extending in the circumferential direction.
The former aspect (that is, the aspect in which at least some of the plurality of liquid supply ports are provided within the region R1) is shown by a die 100B shown in FIG. 4 and a die 100D shown in FIG. In addition, the latter mode (that is, the mode in which at least some of the plurality of liquid supply ports are provided within the region R2) includes the die 100 shown in FIGS. 1 to 3, the die 100A shown in FIG. 100C and die 100E shown in FIG.
Compared to the latter mode, which has the same configuration but differs only in the installation direction of the liquid supply port, the former mode can suppress the influence of dynamic pressure and reduce the flow velocity distribution of the coating liquid. The thickness uniformity in the width direction of the working liquid film can be further improved.

(first lip and second lip)
As shown in FIG. 1, the first lip 10 and the second lip 20 are arranged side by side in the X direction.
Also, as shown in FIG. 1, the shape of the first lip 10 and the second lip 20 are both columnar with the direction Y as the length direction, and the length direction for forming the manifold 40 is has a recess extending into the The first lip 10 and the second lip 20 having such a shape are provided with a spacer 32 sandwiched between the first lip 10 and the second lip 20 as shown in FIGS. The combination defines the slit 30 , the manifold 40 , and the liquid supply port 50 .

The first lip and the second lip are made of metal. Metals include, for example, stainless steel. Note that the first lip may be made of a plurality of metals. For example, the first lip and the second lip, respectively, only the tip portion is formed of ultrafine grain alloy (eg, TF15, Mitsubishi Materials Corporation) or cemented carbide (eg, Nippon Tungsten Co., Ltd.) and the portion other than the tip may be made of stainless steel.

(spacer)
As shown in FIG. 1, the spacer 32 is a member sandwiched between the first lip 10 and the second lip 20 arranged side by side in the X direction.
The size and thickness of the spacer determine the size of the slit, and the coating width (that is, the width of the coating liquid film) and the thickness of the coating liquid film are adjusted.
Also, the number of manifolds can be determined by the shape and installation position of the spacer. For example, as shown in FIG. 2, two manifolds 40 arranged in the length direction of the die 100 may be formed by providing a spacer 32 at the center of the die 100 in the length direction.
The spacer may be a member separate from the first lip and the second lip, or may be formed as part of the first lip and/or the second lip. However, from the viewpoint of facilitating adjustment of the size of the slit, the spacer is preferably a member separate from the first lip and the second lip.

As materials for the spacer, stainless steel or fluorine-based resin such as polytetrafluoroethylene (PTFE) is generally suitable. In addition to the above materials, cemented carbide and resins such as polyetheretherketone (PEEK) may be used as materials for the spacers.

(plug)
The plug 38 is a member that is sandwiched between the first lip 10 and the second lip 20 that are arranged side by side in the direction X, and together with the first lip 10 and the second lip 20, the manifold. 40. In other words, it can be said that the plug 38 is a member that constitutes both ends of the manifold 40 in the length direction.

As the material for the plug, stainless steel or fluorine-based resin such as polytetrafluoroethylene (PTFE) is generally suitable.

(slit)
The slit 30 is a space for transferring along the direction Z and discharging the coating liquid accumulated in the manifold 40 .
The slit 30 is a space separated by a spacer 32 between the first lip 10 and the second lip 20 arranged side by side in the X direction.

The number of slits is not particularly limited as long as it is two or more, and may be appropriately determined according to the application of the coating liquid film (coating film), production efficiency, and the like.
The size of the slit may be appropriately determined according to the size of the intended coating liquid film (coating film).

From the viewpoint of improving the thickness uniformity in the width direction of the coating liquid film, the ratio of the total width of the slits (that is, the coating width) to the total length of the manifold is 0.7 to 0.95. (Tentative) is preferable. That is, in the die according to the present embodiment, it is preferable that the total width of the coated portion (that is, the coating width) is larger than the total width of the uncoated portion.
In addition, from the viewpoint of improving the thickness uniformity in the width direction of the coating liquid film, the width of the coating liquid discharge port of the slit with respect to the connection portion between the slit and the manifold (that is, the opening of the slit in the manifold). Preferably the ratio is between 0.9 and 1.0. That is, it is preferable that the width of the slit is substantially the same on the manifold side and the discharge port side.

(manifold)
The manifold 40 spreads the coating liquid supplied from the liquid supply port 50 (in some cases, the liquid supply ports 50 and 54) in the length direction of the die (direction Y in FIG. 1), and spreads the coating liquid. It is a space for temporary storage.
The manifold 40 is a space formed between the first lip 10 and the second lip 20 arranged side by side in the direction X and closed and/or separated by the spacer 32 .

The number of manifolds may be one, or two or more, but preferably one from the viewpoint of improving thickness uniformity in the width direction of the coating liquid film.
The shape and size of the manifold may be appropriately determined according to the physical properties of the coating liquid. The shape of the manifold is not particularly limited. For example, as shown in FIG. 1, it may be cylindrical or prismatic.

(liquid supply port)
The liquid supply ports 50 and 54 are spaces for supplying the coating liquid to the manifold 40 .
The liquid supply port 50 is a space formed between the first lip 10 and the second lip 20 arranged side by side in the X direction.
Also, the liquid supply port 54 is a space formed in a part of the spacer 32 existing at both ends of the manifold 40 .

A plurality of liquid supply ports 50 and 54 may be provided per manifold 40, and from the viewpoint of improving thickness uniformity in the width direction of the coating liquid film, 2 to 9 ports are provided per manifold 40. more preferably 2 to 5, more preferably 4 to 5.
The equivalent diameter of the liquid supply ports 50, 54 is selected to be about 10 mm to 50 mm from the viewpoint of application to the supply of the coating liquid exhibiting thixotropic properties.

≪Coating equipment≫
The coating apparatus according to this embodiment includes the above-described extrusion die according to this embodiment, and a plurality of liquid supply pipes that supply a coating liquid to the manifold of the extrusion die through liquid supply ports. And prepare.
The liquid supply pipe is not particularly limited as long as it is a pipe capable of supplying a coating liquid exhibiting thixotropy.

Here, it is preferable that each of the plurality of liquid supply pipes is provided with a static mixer. By providing a static mixer in the liquid supply pipe, the viscosity of the coating liquid supplied to the manifold 40 can be made uniform, and the thickness uniformity in the width direction of the coating liquid film can be further enhanced.
From the viewpoint of improving the thickness uniformity in the width direction of the coating liquid film, it is preferable that each of the plurality of liquid supply pipes is provided with a valve. By providing a valve in the liquid supply pipe, it becomes possible to adjust the flow rate of the coating liquid supplied from each liquid supply port to the manifold, and the thickness uniformity of the coating liquid film in the width direction can be further enhanced.

≪Method of use, method of producing coating film≫
Hereinafter, a method for producing a coating film according to this embodiment will be described together with a method for using the die according to this embodiment (the die in the coating apparatus according to this embodiment) with reference to FIG.
The method for producing a coating film according to the present embodiment includes a step of applying a coating liquid exhibiting thixotropic properties (hereinafter referred to as coating Also called manufacturing process).
FIG. 10 is a schematic side view showing an example of when the coating liquid is discharged from the extrusion die according to this embodiment (that is, the coating process).

As shown in FIG. 10, in the coating process, that is, stripe coating using the die 100, for example, the die 100 is applied to the substrate B, which is the object to be coated, at the openings of the slits 30 (coating liquid ) are arranged to face each other.
The distance between the die 100 and the substrate B is not limited, and may be determined, for example, according to the viscosity of the coating liquid and the thickness of the coating liquid film to be formed.

A substrate B is transported in the direction X with respect to the die 100 .
A coating liquid supplied to the manifold 40 of the die 100 is discharged toward the substrate B through the slit 30 .
A coating liquid film can be formed on the substrate B by ejecting the coating liquid from the die 100 while the substrate B is continuously conveyed.

Here, FIG. 10 shows an example in which the base material B is wound around the backup roll 200 when the coating liquid is applied, but it is not limited to this aspect.

The base material, coating solution, etc. used for stripe coating shown in FIG. 10 will be described below. However, stripe coating using the die according to this embodiment is not limited to the following.

-Base material-
The base material used for stripe coating may be selected according to the application of the coating film to be formed, and the applicability to continuous transportation (preferably, applicability to roll-to-roll method) is taken into consideration. can be selected.
As the substrate, a substrate having high thermal conductivity such as a metal substrate may be used. Moreover, you may use a resin film as a base material.

Examples of substrates with high thermal conductivity include substrates with a thermal conductivity of 200 W/m·K or more. In addition, when the base material used in stripe coating is, for example, a base material with a multilayer structure containing a metal foil and a resin film, if the heat conductivity of the base as a whole is 200 W / m K or more, the heat conduction The base material has a rate of 200 W/m·K or more.
The upper limit of the thermal conductivity of the substrate is not particularly limited, and is, for example, 500 W/m·K.

Examples of substrates exhibiting the above thermal conductivity include metal substrates. More specifically, examples of substrates exhibiting the above thermal conductivity include metal substrates made of copper, aluminum, silver, gold, and alloys thereof.
In addition, the metal substrate may be a substrate made of stainless steel, nickel, titanium, or an invar alloy.
Among them, a copper base material and an aluminum base material are preferably used in terms of shape stability as a base material, track record of use, and the like.

The thermal conductivity of the substrate is measured as follows.
First, a base material is cut into a size suitable for the apparatus described later to obtain a measurement sample. The thermal diffusivity in the thickness direction of the obtained measurement sample is measured by a laser flash method. For example, it can be measured using "LFA467" manufactured by NETZSCH. Next, the specific gravity of the measurement sample is measured using a balance. For example, it can be measured using a balance “XS204” (using a “solid specific gravity measurement kit”) manufactured by Mettler Toledo, Inc. Furthermore, using "DSC320/6200" manufactured by Seiko Instruments Inc., the specific heat of the sample for measurement at 25°C is determined using DSC7 software under the condition of temperature increase of 10°C/min. By multiplying the obtained thermal diffusivity by the specific gravity and the specific heat, the thermal conductivity of the measurement sample (that is, the substrate) is calculated.

The thickness of the substrate may be appropriately set from the viewpoint of application to the roll-to-roll system.
The thickness of the substrate is, for example, preferably 5 μm to 100 μm, more preferably 10 μm to 30 μm.
The width and length of the substrate may be appropriately set from the viewpoint of application to the roll-to-roll method and the width and length of the desired coating film.

The thickness of the substrate is measured as follows.
That is, using a contact-type thickness measuring machine, the thickness of the substrate at three locations in the width direction (that is, the position 5 mm from both edges in the width direction and the central portion in the width direction) is measured at intervals of 500 mm in the longitudinal direction. Measure at 3 points.
An arithmetic mean value of the total nine measured values is determined and taken as the thickness of the base material.
As a contact-type thickness measuring machine, for example, S-2270 manufactured by Fuji Work Co., Ltd. is used.

-Conveying Means for Base Material-
There are no restrictions on the means of conveying the substrate during stripe coating.
The means for transporting the base material is, for example, a backup roll (specifically, the backup roll 200 in FIG. 10) from the viewpoint that the base material can be transported in a stretched state and the coating accuracy is improved. is preferred.

The backup roll is a rotatable member. The base material can be transported by rotating the backup roll. The backup roll can also be conveyed by winding the base material thereon. The backup roll may be a driving roll or a driven roll.

The backup roll may be heated from the viewpoint of promoting drying of the coating film and suppressing brushing of the coating film due to a decrease in the film surface temperature (that is, whitening of the coating film due to fine condensation).

The surface temperature of the backup roll is preferably controlled by temperature control means. More preferably, the surface temperature of the backup roll is controlled by temperature control means based on the detected surface temperature.

Examples of temperature control means include heating means and cooling means. In the heating means, for example, induction heating, water heating, or oil heating is used. In the cooling means, for example, cooling by cooling water is used.

The diameter of the backup roll is preferably 100 mm to 1,000 mm, more preferably 100 mm to 800 mm, from the viewpoints of easy winding of the base material, easy coating with a die head, and the production cost of the backup roll. is more preferred, and 200 mm to 700 mm is particularly preferred.

From the viewpoint of productivity and coatability, it is preferable that the transfer speed of the base material by the backup roll is, for example, 10 m/min to 100 m/min.

The wrap angle of the substrate with respect to the backup roll is preferably 60° or more, more preferably 90° or more, from the viewpoint of stabilizing the transportation of the substrate during coating and suppressing the occurrence of unevenness in the thickness of the coating film. more preferred. Also, the upper limit of the wrap angle can be set to 180°, for example.
The wrap angle is an angle formed by the direction in which the substrate is conveyed when the substrate contacts the backup roll and the direction in which the substrate is conveyed when the substrate separates from the backup roll.

- Coating liquid -
As a coating liquid used for stripe coating, a coating liquid exhibiting thixotropic properties is used.
As a coating liquid exhibiting thixotropic properties, for example, the solid content concentration is high (for example, the solid content concentration is 35% by mass or more), and the solid content contains particles at a high concentration (for example, the particle concentration in the solid content 50% by mass or more) coating liquid. Among them, a water-based coating liquid containing particles at a high concentration is preferably applied. Here, the water-based coating liquid includes a coating liquid in which the solvent (or dispersion medium) contained in the coating liquid is substantially water (hereinafter also referred to as water-based coating liquid).

Here, in the water-based coating liquid, "the solvent (or dispersion medium) is substantially water" means that the inclusion of a solvent other than water introduced when using the solid content is allowed, It means that the proportion of water in the total solvent (or the total dispersion medium) is 90% by mass or more, and the proportion of water in the total solvent (or the total dispersion medium) is preferably 95% by mass or more, and the total solvent (or or the entire dispersion medium) is particularly preferably water.
Moreover, the solid content refers to components excluding the solvent (or dispersion medium).

Examples of water contained in the water-based coating liquid include natural water, purified water, distilled water, ion-exchanged water, pure water, and ultrapure water (eg, Milli-Q water). The Milli-Q water is ultrapure water obtained by Merck's Milli-Q water production equipment.

The content of water in the water-based coating liquid is not particularly limited. For example, it is preferably 20% by mass or more, more preferably 30% by mass or more, relative to the total mass of the water-based coating liquid.
The upper limit of the water content is preferably 65% by mass from the viewpoint of expressing thixotropy.

The water-based coating liquid preferably contains particles as one of the solid components, as described above. That is, the water-based coating liquid is preferably a coating liquid containing particles.

The particles are not particularly limited as long as they are particulate, and may be inorganic particles, organic particles, or composite particles of inorganic and organic substances.

As the inorganic particles, known inorganic particles that can be applied to the intended coating film can be used.
Examples of inorganic particles include particles of metals (alkali metals, alkaline earth metals, transition metals, or alloys of these metals), particles of semimetals (such as silicon), or compounds of metals or semimetals (oxides, particles of hydroxides, nitrides, etc.), particles of pigments containing carbon black and the like, and the like.
Inorganic particles also include mineral particles such as mica, inorganic pigment particles, and the like.

As the organic particles, known organic particles that can be applied to the intended coating film can be used.
The organic particles are not particularly limited as long as they are solid organic particles including resin particles and organic pigment particles.

Composite particles of inorganic substances and organic substances include composite particles in which inorganic particles are dispersed in a matrix of organic substances, composite particles in which the periphery of organic particles is coated with inorganic substances, and composite particles in which the periphery of inorganic particles is coated with organic substances. composite particles and the like.

The particles may be surface-treated for the purpose of imparting dispersibility.
In addition, the above composite particles may be obtained by subjecting the composite particles to a surface treatment.

There are no particular restrictions on the particle size, specific gravity, usage form (for example, whether or not they are used in combination), etc., and may be determined according to the intended coating film or conditions suitable for producing the coating film. can be selected as appropriate.

The content of the particles in the water-based coating solution is not particularly limited, and may be appropriately adjusted depending on the desired coating film, conditions suitable for producing the coating film, or purpose of adding the particles. , should be determined.
The content of the particles in the water-based coating liquid is preferably 50% by mass or more as the particle concentration in the solid content, for example, from the viewpoint of obtaining a coating liquid exhibiting thixotropic properties.

The solid content other than the particles contained in the water-based coating liquid is not particularly limited, and includes various components used for obtaining the intended coating film.
Specifically, the solid content contained in the water-based coating liquid includes, in addition to the above particles, a binder component, a component that contributes to the dispersibility of the particles, a polymerizable compound, a reactive component such as a polymerization initiator, a surfactant, and the like. Ingredients for enhancing coating performance, other additives, and the like.

Examples of coating liquids exhibiting thixotropic properties include the water-based coating liquids described above, as well as water-based polymer solutions, solvent-based particle dispersions, solvent-based polymer solutions, and the like.
Even when these coating liquids are used, the thickness uniformity in the width direction of the coating liquid film can be improved by using the die according to the present embodiment.

-Thickness of coating liquid film-
The film thickness of the coating liquid film formed in stripe coating is not particularly limited, and may be appropriately determined according to the intended coating film.
The thickness of the coating liquid film can be selected, for example, from 50 μm to 350 μm, from 80 μm to 300 μm, and from 80 μm to 200 μm.

The thickness of the coating liquid film is measured as follows.
That is, for the coating liquid film, three locations along the width direction (specifically, the position of 5 mm from both edges in the width direction and the central portion in the width direction), an optical interference thickness measuring machine (for example, Keyence Corporation (Infrared spectroscopic interference type film thickness meter SI-T80). The arithmetic average value of the measured values at three points is obtained, and this value is defined as the thickness of the coating liquid film.

－Coating Width－
In stripe coating, the width of one strip of coating (that is, the width of one strip of coating liquid film) is not particularly limited, and may be appropriately determined according to the intended coating film.
The coating width can be selected to be, for example, 200 mm or less, 150 mm or less, or 100 mm or less.
The lower limit of the coating width is, for example, 30 mm.
In addition, the coating width may be different for each line, or may be the same. However, from the viewpoint of quality control, etc., it is preferable that the coating widths of the plurality of coating liquid films are approximately the same. At this time, it is preferable that the difference in coating width between the plurality of coating liquid films is 2 mm or less.

-Width of uncoated part-
In stripe coating, the width of the uncoated portion between the coating liquid films (that is, the width of the exposed portion of the base material between the coating liquid films) is not particularly limited, and may vary depending on the intended use of the coating film. can be determined as appropriate.
The width of the uncoated portion between the coating liquid films can be selected, for example, from 5 mm to 100 mm.
When there are a plurality of uncoated portions between coating liquid films, the widths of the plurality of uncoated portions may be different or the same.

The width of the coating and the width of the uncoated portion are measured as follows.
That is, the film surface of the coating liquid film is viewed from above, and the width of one strip of the coating liquid film is measured with a ruler at three points spaced apart by 500 mm in the longitudinal direction. Arithmetic mean value of measured values of three points is obtained, and this value is defined as coating width.
In addition, the film surface of the coating liquid film is viewed from above, and the width of the uncoated portion between the coating liquid films is measured by a ruler at three points spaced apart by 500 mm in the longitudinal direction. The arithmetic mean value of the measured values of the three points is determined and taken as the width of the uncoated portion.

- Number of coating liquid films formed -
In stripe coating, the number of coating liquid films to be formed may be two or more. Just do it.

As described above, the coating liquid film formed in stripes on the substrate in the coating process becomes a coating film through, for example, a drying process.
A known drying means can be applied to dry the coating liquid film.
Other known treatments may be applied to the coating liquid film.

EXAMPLES The present invention will be described more specifically below with reference to examples. The materials, amounts used, proportions, details of the configuration of each die, and the like shown in the following examples can be changed as appropriate without departing from the gist of the present invention. Accordingly, the scope of the present invention is not limited to the specific examples shown below.
Both "parts" and "%" are based on mass. In addition, "100, 100A to 100G" in Table 1 refer to "dies 100, 100A to 100G" shown in FIGS. 1 to 9, 11, and 12, respectively.

<Preparation of base material>
An aluminum substrate (thermal conductivity: 230 W/m·K) having a thickness of 20 μm and a length of 300 m was prepared.

<Preparation of coating solution>
[Preparation of water-based coating liquid 1]
A water-based coating liquid 1 was prepared by mixing the following components. The water-based coating liquid 1 is a coating liquid exhibiting thixotropy.
・ Polyvinyl alcohol: 58 parts (CKS-50: degree of saponification 99 mol%, degree of polymerization 300, Nippon Synthetic Chemical Industry Co., Ltd.)
・Daiichi Kogyo Seiyaku Co., Ltd. Cerogen PR: 24 parts ・Surfactant (Nippon Emulsion Co., Ltd., Emarex (registered trademark; hereinafter the same) 710): 5 parts ・ARTPEARL J prepared by the following method -7P aqueous dispersion: 913 parts

(Aqueous dispersion of Art Pearl J-7P)
In 74 parts of pure water, 3 parts of Emarex 710 (Nippon Emulsion Co., Ltd., nonionic surfactant) and 3 parts of sodium carboxymethylcellulose were added and dissolved. 20 parts of Artpearl (registered trademark) J-7P (Neagari Kogyo Co., Ltd., silica composite crosslinked acrylic resin fine particles) are added to the resulting aqueous solution, and the mixture is stirred at 10,000 rpm with an Ace homogenizer (Nippon Seiki Seisakusho Co., Ltd.). revolutions per minute; hereinafter the same.) for 15 minutes to obtain an aqueous dispersion of Artpearl J-7P (particle concentration: 20% by mass).
The true specific gravity of the silica composite crosslinked acrylic resin fine particles in the obtained aqueous dispersion is 1.20, and the average particle size is 6.5 μm.

[Preparation of water-based coating liquid 2]
The following components were mixed and stirred with a dissolver (2000 rpm, 30 minutes) to prepare a water-based coating liquid 2 (dispersion A:dispersion B=25:75). The aqueous coating liquid 2 had a viscosity of 20 mPa·s at 25° C. and an average particle size of 0.108 μm. The water-based coating liquid 2 is a coating liquid exhibiting thixotropic properties.
Dispersion A prepared by the following method: 132.1 parts Dispersion B prepared by the following method: 396.2 parts Boric acid (crosslinking agent): 2.94 parts Polyvinyl alcohol (7.3% Aqueous solution): 230.7 parts (Kuraray Co., Ltd., PVA 235, degree of saponification 88%, degree of polymerization 3500)
・Diethylene glycol monobutyl ether: 2.7 parts (Butysenol 20-P, KH Neochem Co., Ltd.)
・Ion-exchanged water: 93.5 parts ・Polyoxyethylene lauryl ether (surfactant): 0.49 parts (Emulgen 109P 10% aqueous solution, HLB value 13.6, Kao Corporation)
・ Ethanol: 41.4 parts

(Preparation of Dispersion A)
After the following components were mixed and ultrasonically dispersed, the dispersion was heated to 30° C. and held for 8 hours to prepare Dispersion A.
・Vapor-phase silica fine particles (inorganic fine particles): 299.6 parts (AEROSIL 300SF75, Nippon Aerosil Co., Ltd.)
・Ion-exchanged water: 1400 parts ・Alphine 83 (40.0% aqueous solution): 300 parts (dispersant, Taimei Chemical Industry Co., Ltd.)

(Preparation of Dispersion B)
After the following components were mixed and ultrasonically dispersed, the dispersion was heated to 30° C. and held for 8 hours to prepare Dispersion B.
・Vapor phase silica fine particles (inorganic fine particles): 225.2 parts (AEROSIL 300SF75, Nippon Aerosil Co., Ltd.)
- Ion-exchanged water: 1185 parts - Cationic polymer A having the following structure (25% by mass aqueous solution, number average molecular weight (Mn): 10,000): 90 parts

[Example 1]
Using the coating apparatus equipped with the die 100 shown in FIGS. 1 and 2, as shown in FIG. 10, the water-based coating liquid 1 is applied on the aluminum substrate by stripe coating in four lines. A working liquid film was formed, and the formed four strips of the coating liquid film were dried to obtain four strips of the coating film.
Specifically, first, using a coating apparatus equipped with a die 100 shown in FIGS. 1 and 2, a water-based coating liquid 1 is applied onto a continuously conveyed substrate along the longitudinal direction of the substrate. It was coated in a stripe shape with 4 lines. As shown in FIG. 2, the die 100 has two connected slits per manifold and two liquid supply ports per manifold. The die 100 had a width of 1500 mm and a height of ¹⁵⁰ mm. In the formed coating liquid film, the coating width of one coating liquid film was 300 mm, the film thickness was 0.1 mm, and the width of the uncoated portion between the coating liquid films was 30 mm. , the width of the uncoated portion at both ends of the substrate was 60 mm.
Subsequently, hot air at 70° C. was applied to the coating liquid film to dry the coating liquid film.
As described above, four coating films were formed on the substrate.

[Examples 2 to 6]
In the same manner as in Example 1, except that the die 100 provided in the coating apparatus in Example 1 was replaced with one of the dies 100A to 100E shown in FIGS. A working film was formed.
Here, the die 100A has four slits connected to one manifold and two liquid supply ports to one manifold, as shown in FIG. Both of the two liquid supply ports open toward the opening of the slit. Die 100A differs from die 100 only in that it has one manifold.
As shown in FIG. 5, the die 100B has four slits connected to one manifold and two liquid supply ports to one manifold. Both of the two liquid supply ports open toward the surface closed by the spacer. The die 100B differs from the die 100A only in the opening direction (installation location) of the liquid supply port.
As shown in FIG. 7, the die 100C has four slits connected to one manifold and three liquid supply ports to one manifold. All of the three liquid supply ports open toward the opening of the slit. The die 100C differs from the die 100A only in the number of liquid supply openings and the installation location.
As shown in FIG. 8, the die 100D has four slits connected to one manifold and a total of four liquid supply ports 50 and 54 in one manifold. The die 100D differs from the die 100A only in the number of liquid supply openings and the installation location.
As shown in FIG. 9, the die 100E has four slits connected to one manifold and a total of five liquid supply ports 50 and 54 in one manifold. The die 100E differs from the die 100A only in the number of liquid supply openings and the installation location.

[Examples 7 and 8]
In the same manner as in Example 1, except that the coating apparatus equipped with the die 100D used in Example 5 was used and the incidental equipment (static mixer or valve) of the liquid supply pipe was used, four lines were formed on the substrate. A coating film was formed.
As a static mixer, N60 series (12 elements) manufactured by Noritake Co., Ltd. was used.

[Example 9]
Four strips of coating film were formed on the substrate in the same manner as in Example 8, except that the water-based coating liquid 1 was replaced with the water-based coating liquid 2.

[Comparative Examples 1 and 2]
Four coating films were formed on the substrate in the same manner as in Example 1 except that the die 100 provided in the coating apparatus in Example 1 was replaced with dies 100F and 100G shown in FIGS. formed.

The die 100F shown in FIG. 11 is aligned along the length of the die 100F (i.e., direction Y) by a first lip 10, a second lip (not shown), and five spacers 32, similar to FIG. Four slits 30 , four manifolds 40 connected to the four slits 30 respectively, and four liquid supply ports 50 for supplying the coating liquid to the four manifolds 40 are defined.
Thus, in the die 100F, one slit is connected to one manifold, and one manifold has one liquid supply port.
Further, the liquid supply port 50 opens toward the opening 34 of the slit 30 in each of the four manifolds 40 of the die 100F.
Die 100F differs from die 100 only in that the number of manifolds is changed and the number of manifolds is four.

The die 100G shown in FIG. 12 is aligned in the length direction (i.e., direction Y) of the die 100G by a first lip 10, a second lip (not shown), and five spacers 32, similar to FIG. Four slits 30 , one manifold 40 connected to the four slits 30 , and one liquid supply port 50 for supplying the coating liquid to the one manifold 40 are defined.
Thus, in the die 100G, four slits are connected to one manifold, and one manifold has one liquid supply port.
Also, one liquid supply port 50 in the die 100G opens toward the opening 34 of the slit 30 .
The die 100G differs from the die 100A only in the number of openings of the liquid supply port and the installation location.

[Evaluation of thickness unevenness]
The thickness in the width direction of the obtained four coating films was measured with a film thickness measuring device (SI-T80, Keyence Corporation), and based on the obtained measured values, the following evaluations were made. gone.
In addition, the width direction was equally divided into 10 with respect to one coating film, and the measurement point was taken as the width direction central part. That is, the number of measurement points is 10 for each strip of coating film.

(Evaluation of thickness unevenness in one coating film)
From the measured values obtained, the rate of change in thickness for each coating film (that is, for each of the four coating films) was determined. Of the maximum value X _Max and the minimum value X _Min obtained from the measured values, the variation rate of the thickness was calculated using the following formula 1 by selecting the one with the greater difference from the average value X _Ave.
Formula 1: Variation rate of thickness (%) = | maximum value X _Max or minimum value X _Min - average value X _Ave |/average value X _Ave × 100
Here, in Equation 1, the maximum value X _Max is the maximum value among the measured values for one line (for 10 points), and the minimum value X _Min is the minimum value for the measured values for one line (for 10 points). The average value X _Ave is the arithmetic mean value of the measured values for one line (for 10 points).
Of the variations in the thickness of the four strips obtained by the method described above, the one showing the largest value was adopted, and the thickness unevenness was evaluated according to the following criteria.
-standard-
A: The thickness variation rate is 2% or less.
·B: The value of the thickness variation rate is more than 2% and 4% or less.
· C: The value of the variation rate of thickness is more than 4% and 6% or less.
*D: The value of the variation rate of the thickness is more than 6% and 8% or less.
E: The value of the thickness variation rate is more than 8%.

(Thickness unevenness between multiple coating films)
From the obtained measured values, the average thickness of each coating film (that is, each of the four coating films) is obtained, and the four obtained (four strips) of the average thickness are calculated. asked. Variation in the average thickness value was calculated using Equation 2 below.
Formula 2: Variation in average thickness value (%) = (maximum average thickness value Y _Max - minimum average thickness value Y _Min ) / average thickness average value Y _Ave × 100
Here, in formula 2, the maximum value Y _Max of the average thickness value is the maximum value among the four average thickness values, and the minimum value Y _Min of the average thickness value is the minimum value among the four average thickness values. The average value Y _Ave of the average values is the arithmetic average value of the four thickness average values.

-standard-
A: Variation in average thickness between four coating liquid films is 0.5% or less.
B: Variation in thickness average value among four coating liquid films is more than 0.5% and not more than 1.0%.
C: Variation in thickness average value among four coating liquid films is more than 1.0% and not more than 1.5%.
D: Variation in thickness average value among four coating liquid films is more than 1.5% and not more than 2.0%.
E: Variation in thickness average value among four coating liquid films is more than 2.0%.

As is clear from Table 1, according to the production of the coating film using the die of the example, it is found that the thickness uniformity in the width direction of the coating film is excellent.

[Thickness distribution of coating film]
The four coating films obtained using the dies described in Examples 1 to 9 and Comparative Examples 1 and 2 have thickness distributions as shown in FIGS. 13 and 14. FIG. Here, FIG. 13 and FIG. 14 are schematic diagrams in the case of cutting four strips of the coating film M formed on the base material B along the width direction of the base material. Note that the thickness distribution of the four coating films shown in FIGS. 13 and 14 is a schematic diagram emphasizing the tendency thereof, and is not to scale.
As is clear from FIGS. 13 and 14, four coating films represented by (1) to (8, 9) obtained by manufacturing coating films using the dies of Examples 1 to 9 has a smaller thickness distribution than the four coating films shown in (C1) and (C2) obtained by manufacturing the coating films using the dies of Comparative Examples 1 and 2, and the width of the coating film It can be seen that the thickness uniformity in the direction is excellent.

[Description of symbols]
100, 100A-100G die 10 first lip 20 second lip 30 slit 32 spacer 34 opening of slit 36 face formed by spacer 38 plug 40 manifold 50 inlet 52 opening of inlet 54 of manifold Liquid supply ports at both ends 56 Liquid supply port openings at both ends of the manifold Area sandwiched between two straight lines extending in the R2 direction R2 Area sandwiched between straight lines extending in the circumferential direction along both edges in the width direction of the connection with the slit on the surface defining the manifold

The disclosure of Japanese Patent Application No. 2021-143506 filed on September 2, 2021 is incorporated herein by reference in its entirety. All publications, patent applications and technical standards mentioned herein are to the same extent as if each individual publication, patent application and technical standard were specifically and individually indicated to be incorporated by reference. incorporated herein by reference.

Claims (11)

1. An extrusion type die used in a method of stripe coating a coating liquid exhibiting thixotropic properties,
   comprising two lips and a plurality of spacers sandwiched between the two lips;
   a plurality of longitudinally aligned slits defined by two lips and a plurality of spacers, one or more manifolds connected to the one or more slits, and coating to the one or more manifolds At least a liquid supply port that supplies liquid,
   Extrusion die with multiple feed ports per manifold.
2. At least part of the plurality of liquid supply ports is located in a region R1 sandwiched between two straight lines extending in the circumferential direction along both edges in the width direction of the spacer between adjacent slits on the surface defining the manifold. 2. The extrusion die of claim 1, wherein the extrusion die is provided in a
3. The extrusion die according to claim 2, wherein one or more liquid supply ports provided in the region R1 are provided at positions facing the spacers in the same region R1.
4. The extrusion die according to claim 2, wherein a part of the plurality of liquid supply ports is provided on at least one of both longitudinal ends of the manifold.
5. At least part of the plurality of liquid supply ports is provided in a region R2 sandwiched between straight lines extending in the circumferential direction along both width direction edges of the connection portion with the slit on the surface defining the manifold, The extrusion die of claim 1.
6. The extrusion die according to claim 5, wherein one or more liquid supply ports provided in the region R2 are provided at positions facing the openings of the slits in the same region R2.
7. The extrusion die according to claim 5, wherein a part of the plurality of liquid supply ports is provided on at least one of both longitudinal ends of the manifold.
8. an extrusion die according to any one of claims 1 to 7;
   a plurality of liquid supply pipes for supplying the coating liquid through the liquid supply port to the manifold of the extrusion die;
   coating equipment.
9. The coating apparatus according to claim 8, wherein each of the plurality of liquid supply pipes is provided with a static mixer.
10. The coating device according to claim 8, wherein each of the plurality of liquid supply pipes is provided with a valve.
11. A method for producing a coating film, comprising the step of coating a coating liquid exhibiting thixotropic properties using the coating apparatus according to claim 8 on a continuously conveyed base material.

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