Coating device and coating method

Abstract

To suppress defects of a coating film formed on a base material provided with an opening part.SOLUTION: A coating device 20 coats coating liquid C to both faces of a base material 2, and includes: first and second blocks 21, 22 which face to each other in a thickness direction of the base material 2; and a liquid pool part 23 which is formed so that the coating liquid C is pooled in a gap between the first and second blocks 21, 22 and through which the base material 2 is passed. The liquid pool part 23 includes: a base material introducing port 24 which opens to an upstream side in the conveying direction of the base material 2 and into which the base material 2 is introduced; a base material discharge port 25 which opens to a downstream side in the conveying direction and through which the base material 2 is discharged; and side face parts 26 which are located respectively at both sides in a width direction. An opening edge part 25a of the base material discharge port 25 includes a first inclination part R1 and a second inclination part R2 inclining in a direction G perpendicular to the conveying direction when viewed in the width direction and the thickness direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a coating device and a coating method. [Background technology]

[0002] For example, various techniques have been disclosed regarding coating devices for forming coating films on both sides of a sheet-like substrate that is transported by a roll-to-roll method.

[0003] For example, in the coating device (applicator) disclosed in Patent Document 1, first, a continuously conveyed long sheet-like substrate is immersed in an immersion tank containing the coating liquid, thereby coating both sides of the substrate with the coating liquid. Then, while the substrate is raised vertically, a pair of scraping rolls scrapes off excess coating liquid from both sides of the substrate. This forms a coating film of a uniform thickness on both sides of the substrate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 64-7965 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when attempting to form a coating film on both surfaces or side surfaces of a substrate having openings such as slits, the openings may become blocked with the coating liquid, the coating liquid may not sufficiently reach the side surfaces of the substrate, or the thickness of the coating film formed on both surfaces of the substrate may become uneven in the substrate transport direction.

[0006] When an opening is provided in the substrate in this way, defects may occur in the coating film formed on both surfaces or the side surface of the substrate, contrary to the user's intention.

[0007] The present disclosure has been made in view of the above points, and an object thereof is to suppress defects in a coating film formed on a substrate having openings formed thereon. [Means for solving the problem]

[0008] A coating device according to the present disclosure is a coating device that applies a coating liquid to both sides of a sheet-like substrate being transported, and includes a pair of blocks facing each other in the thickness direction of the substrate, and a liquid pool portion formed so that the coating liquid pools in the gap between the pair of blocks and through which the substrate passes, the liquid pool portion including a substrate inlet that opens upstream in the transport direction of the substrate and through which the substrate is introduced, a substrate outlet that opens downstream in the transport direction and through which the substrate is discharged, and side portions located on both sides in a width direction intersecting the transport direction, and the opening edge portion of the substrate outlet includes an inclined portion that is inclined with respect to a direction perpendicular to the transport direction when viewed in at least one of the width direction and the thickness direction.

[0009] In the coating method according to the present disclosure, the substrate having openings formed therein is passed through the liquid reservoir using the coating device. [Effects of the Invention]

[0010] According to the present disclosure, defects in a coating film formed on a substrate having openings can be suppressed. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram schematically illustrating a coating system including a coating device according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a front view of the coating device according to the first embodiment. [Figure 3] FIG. 3 is a plan view of the coating device according to the first embodiment. [Figure 4] FIG. 4 is a side view of the coating device according to the first embodiment. [Figure 5]FIG. 5 is an enlarged front view showing the vicinity of the substrate discharge port of the coating device according to the first embodiment. [Figure 6] FIG. 6 is a plan view of a coating device according to the second embodiment. [Figure 7] FIG. 7 is a plan view of a coating device according to the third embodiment. [Figure 8] FIG. 8 is an enlarged front view of a coating device according to a fourth embodiment. [Figure 9] FIG. 9 is an enlarged front view of a coating device according to a fifth embodiment. [Figure 10] FIG. 10 is a plan view of a coating device according to the sixth embodiment. [Figure 11] FIG. 11 is a plan view of a coating device according to the seventh embodiment. [Figure 12] FIG. 12 is a plan view of a coating device according to the eighth embodiment. [Figure 13] FIG. 13 is a front view of a coating device according to a ninth embodiment. [Figure 14] FIG. 14 is a plan view of a coating device according to a tenth embodiment. [Figure 15] FIG. 15 is an enlarged front view of a coating device according to an eleventh embodiment. [Figure 16] FIG. 16 is a side view of a coating device according to a twelfth embodiment. [Figure 17] FIG. 17 is a diagram schematically showing a coating device according to a thirteenth embodiment. [Figure 18] FIG. 18 shows a schematic diagram of the mechanism by which defects occur in a coating film formed on a substrate in a conventional coating device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present disclosure, its applications, or its uses.

[0013] First Embodiment (Device configuration) 1 schematically shows a coating system 1 according to a first embodiment of the present disclosure. The coating system 1 is for continuously forming a coating film F on both sides of a substrate 2. The coating system 1 is composed of a substrate supply device 10, a coating device 20, and a coating liquid supply device 40.

[0014] The substrate 2 is formed in the shape of a long sheet. Examples of the substrate 2 include metal foil, resin film, woven fabric, nonwoven fabric, and paper. The thickness t (see FIG. 5) of the substrate 2, excluding the coating film F, is, for example, 1 mm or less.

[0015] The base material supplying device 10 continuously transports the base material 2 by a roll-to-roll method, with its longitudinal direction being the transport direction (indicated by X). Specifically, the base material supplying device 10 continuously transports the base material 2 by unwinding the base material 2 with an unwinder 11 and winding it with a winder 12. The transported base material 2 passes through a first roll 13 and a second roll 14 along the way.

[0016] A coating device 20 is disposed between the first roll 13 and the second roll 14 in the conveying direction of the substrate 2. The coating device 20, which will be described in detail later, applies a coating liquid C to both sides of the sheet-like substrate 2 that is being continuously conveyed, to form a coating film F on both sides of the substrate 2. The substrate 2 with the coating film F formed on both sides by the coating device 20 is dried in a drying oven (not shown) to remove volatile components contained in the coating film F, and then taken up by a winder 12.

[0017] The configuration of the coating device 20 will be described in detail. Figures 2 to 5 show the coating device 20 according to this embodiment, with Figure 2 being a front view (viewed from the arrow II), Figure 3 being a plan view (viewed from the arrow III), Figure 4 being a side view (viewed from the arrow IV), and Figure 5 being an enlarged front view of the vicinity of a substrate discharge port 25, which will be described later.

[0018] In this embodiment, the conveyance direction (longitudinal direction) and width direction (denoted by Y) of the substrate 2 are horizontal. The width direction of the substrate 2 intersects, specifically, is perpendicular to, the conveyance direction of the substrate 2. The thickness direction (denoted by Z) of the substrate 2 is vertical.

[0019] 2, the coating device 20 includes a pair of blocks, specifically a first block 21 and a second block 22. The first block 21 and the second block 22 are arranged at a predetermined interval from each other in the thickness direction of the substrate 2, and face each other in the thickness direction of the substrate 2. Each of the blocks 21, 22 is formed in a substantially rectangular parallelepiped shape, and is arranged so that its longitudinal direction is aligned with the conveyance direction of the substrate 2.

[0020] 3 and 4, L1 is the length dimension of each block 21, 22. L2 is the width dimension of each block 21, 22. L3 is the thickness dimension of each block 21, 22. It is preferable that the length dimension L1 of each block 21, 22 is sufficiently larger (for example, 100 times or more) than the thickness dimension t of the base material 2 (see FIG. 5). B is the width dimension of the base material 2.

[0021] 2, a liquid reservoir 23 is formed in the gap 23 between a pair of blocks, i.e., the gap 23 between the first block 21 and the second block 22, so that the coating liquid C can accumulate (hereinafter referred to as the "liquid reservoir 23"). When the substrate 2 passes through the liquid reservoir 23, the coating liquid C is applied to both surfaces of the substrate 2, and a coating film F is formed on both surfaces of the substrate 2.

[0022] The coating liquid C is preferably in the form of a paste or a slurry. The viscosity η of the coating liquid C is preferably 1 mPa·s or more, and more preferably 1 Pa·s to 1000 Pa·s. For example, the coating liquid C can be made of an insulating material containing metal oxide particles such as silica, low-melting-point glass, alumina, or titanium oxide; metal particles such as solder, copper, silver, or metal-coated particles; a conductive material containing lithium nickel oxide, lithium manganese oxide, lithium cobalt oxide, or carbon; or a dye.

[0023] H indicates the gap dimension between the first block 21 and the second block 22. The gap dimension H is larger than the thickness dimension t (for example, 0.1 mm or less) of the substrate 2 so that the substrate 2 can pass through. The gap dimension H should be as small as possible, and is preferably 0.1 mm or more and 1 mm or less.

[0024] The liquid reservoir 23 includes a substrate inlet 24 that opens on the upstream side (left side in FIG. 2) in the conveyance direction of the substrate 2, and a substrate outlet 25 that opens on the downstream side (right side in FIG. 2) in the conveyance direction of the substrate 2. The substrate inlet 24 and the substrate outlet 25 face each other in the conveyance direction. The substrate 2 is introduced from the substrate inlet 24, passes through the liquid reservoir 23, and is discharged from the substrate outlet 25. Details of the substrate outlet 25 will be described later.

[0025] 3 and 4, the liquid reservoir 23 includes side portions 26 located on both sides in the width direction of the substrate 2. The side portions 26 refer to surfaces that extend in the transport direction and thickness direction and form the width direction ends of the liquid reservoir 23. The side portions 26 are composed of a first side portion 26a on one side in the width direction (the right side in FIG. 4) and a second side portion 26b on the other side in the width direction (the left side in FIG. 4). The first side portion 26a and the second side portion 26b face each other in the width direction.

[0026] As shown in Fig. 4, an exposed opening 29 is provided in one side surface portion 26 in the width direction, more specifically, in the second side surface portion 26b on the other side in the width direction. The exposed opening 29 is open in the second side surface portion 26b from the substrate inlet 24 side (upstream side) to the substrate outlet 25 side (downstream side) (see Fig. 2). That is, the second side surface portion 26b is open. As shown in Fig. 4, a portion of the substrate 2 in the width direction can protrude from the exposed opening 29 to the outside of the liquid reservoir portion 23.

[0027] As shown in Fig. 4, the side surface portion 26 on one side in the width direction, specifically the first side surface portion 26a on one side in the width direction, does not have an exposure opening 29. In other words, the first side surface portion 26a is closed. The first side surface portion 26a is formed by a side surface facing the liquid reservoir portion 23 in the side block 27 that covers one side of the liquid reservoir portion 23 in the width direction. The side block 27 is formed in a substantially rectangular parallelepiped shape. The first block 21, the second block 22, and the side block 27 may be formed as a single unit.

[0028] 2 and 4, a coating liquid supply port 31 is provided on the surface of the first block 21 facing the liquid reservoir 23. Similarly, a coating liquid supply port 31 is provided on the surface of the second block 22 facing the liquid reservoir 23. The coating liquid supply port 31 faces the liquid reservoir 23 and supplies the coating liquid C to the liquid reservoir 23.

[0029] 3, the coating liquid supply port 31 is disposed at the other widthwise end (near the exposed port 29) of the liquid reservoir 23 (first block 21 and second block 22). A plurality of coating liquid supply ports 31 (specifically, three ports in each of the blocks 21 and 22) are arranged side by side in the transport direction.

[0030] As shown in Figures 2 and 4, the coating liquid supply port 31 of the first block 21 and the coating liquid supply port 31 of the second block 22 face each other in the thickness direction of the substrate 2. As shown in Figure 3, the cross-sectional shape of the coating liquid supply port 31 is, for example, circular or elliptical. The diameter of the coating liquid supply port 31 is preferably 1 mm or more. The cross-sectional areas of the coating liquid supply ports 31 are equal to each other. Note that the number of coating liquid supply ports 31 may be one.

[0031] 1, the coating fluid supply device 40 is a device for supplying the coating fluid C to the coating device 20, and is composed of a coating fluid supply pump 41 and a coating fluid supply pipe 42. The coating fluid supply pump 41 and the coating fluid supply pipe 42 are provided outside the first block 21 and the second block 22.

[0032] 2, the coating liquid supply pipe 42 has a main supply pipe 42a that starts from the coating liquid supply pump 41 and branches into a plurality of branch supply pipes 42b. Each branch supply pipe 42b corresponds to one of the coating liquid supply ports 31.

[0033] 1, 2, and 4, coating liquid supply paths 33 are provided inside first block 21 and second block 22 so as to correspond to each coating liquid supply port 31. Each coating liquid supply path 33 communicates with a coating liquid supply pump 41 via a coating liquid supply pipe 42 on its upstream side, and with the coating liquid supply port 31 on its downstream side. Each coating liquid supply path 33 extends substantially straight in the thickness direction. Note that each of first block 21 and second block 22 may have a manifold inside.

[0034] It is preferable to use a pump capable of supplying a fixed amount of coating liquid, such as a screw pump, diaphragm pump, syringe pump, or tube pump, as the coating liquid supply pump 41. Instead of the coating liquid supply pump 41, a coating liquid supply mechanism may be used in which compressed air is introduced into a supply tank to pressure-feed the coating liquid. Although not shown, a coating liquid discharge mechanism may be provided to remove the coating liquid C from the liquid reservoir 23 when coating is stopped.

[0035] The amount of coating liquid C supplied to the liquid reservoir 23 via the coating liquid supply port 31 is approximately equal to the sum of the amount of coating liquid C (coating film F) discharged together with the substrate 2 from the liquid reservoir 23 via the substrate discharge port 25 and the amount of coating liquid C discharged from the liquid reservoir 23 by the coating liquid discharge mechanism. More specifically, the amount of coating liquid C supplied to the liquid reservoir 23 via the coating liquid supply port 31 is greater than the amount of coating liquid C (coating film F) discharged together with the substrate 2 from the liquid reservoir 23 via the substrate discharge port 25. Excess coating liquid C in the liquid reservoir 23 is then discharged from the liquid reservoir 23 by the coating liquid discharge mechanism.

[0036] Here, as shown in FIG. 3, an opening 3 is provided in the substrate 2. In this embodiment, the opening 3 is configured as a slit extending along the width direction of the substrate 2 (hereinafter, may be referred to as "slit 3"). The slit 3 is longitudinal in the width direction of the substrate 2. The width dimension of the slit 3 in the longitudinal direction (width direction of the substrate 2) is d1. The opening width of the slit 3 in the transport direction is d2.

[0037] A plurality of slits 3 are provided on one widthwise side 2a (more specifically, one widthwise end) of the substrate 2. No slits 3 are provided on the other widthwise side 2b of the substrate 2. Each slit 3 includes a base end (root portion) 3a on the widthwise center side (other widthwise side) and a tip end 3b on one widthwise side. The tip end 3b on one widthwise side of the slit 3 is open. The plurality of slits 3 are aligned in the conveyance direction. The substrate 2 is formed in a so-called comb-like shape.

[0038] The form of the opening 3 is not limited to a slit. The opening 3 is a concept that encompasses, for example, a slit, a notch, a through-hole, or a recess provided on the surface of the substrate 2, a gap provided on the side of the substrate 2 (for example, a gap between adjacent sawtooth teeth in the conveying direction), or a mesh or porous portion provided throughout the substrate 2. The substrate 2 is not limited to a flat shape as in this embodiment. The substrate 2 may be made of, for example, a punched metal, a mesh material, a porous material, or the like, or may be formed in a sawtooth shape, a ladder shape, or the like.

[0039] The substrate discharge port 25 will be described in detail. As shown in Fig. 4, an opening edge 25a of the substrate discharge port 25 is located around (around) the substrate discharge port 25 (liquid reservoir 23) as viewed in the conveying direction. The opening edge 25a of the substrate discharge port 25 is made up of the downstream surface of the first block 21 in the conveying direction, the downstream surface of the second block 22 in the conveying direction, and the downstream surface of the side block 27 in the conveying direction. The opening edge 25a of the substrate discharge port 25 is formed in a roughly U-shape as viewed in the conveying direction, with the other widthwise side (exposed opening 29 side) open. The opening edge 25a of the substrate discharge port 25 faces the downstream side in the conveying direction.

[0040] 2, the opening edge 25a of the base material discharge port 25 includes a first inclined portion R1 that is inclined with respect to a direction (plane) G perpendicular to the conveying direction when viewed in the width direction. The first inclined portion R1 is made up of a surface of the first block 21 on the downstream side in the conveying direction and a surface of the second block 22 on the downstream side in the conveying direction.

[0041] 2, the first inclined portion R1 is provided on the inner side in the thickness direction of the first block 21 and the second block 22 (a pair of blocks), i.e., on the liquid reservoir 23 side in the thickness direction. In detail, the first inclined portion R1 is obtained by chamfering the corners of the first block 21 and the second block 22 on the inner side in the thickness direction (the liquid reservoir 23 side) and on the downstream side in the conveying direction.

[0042] The first inclined portion R1 faces the inner side in the thickness direction, i.e., the liquid pool 23 side in the thickness direction, as viewed in the width direction. Furthermore, the first inclined portion R1 extends outward in the thickness direction, i.e., on the opposite side of the liquid pool 23 in the thickness direction, as it extends from the upstream side to the downstream side in the conveying direction, as viewed in the width direction.

[0043] When viewed in the width direction, the first inclined portion R1 is inclined at a first inclination angle θ1 toward the downstream side in the conveying direction with respect to a direction G perpendicular to the conveying direction. The first inclination angle θ1 is, for example, preferably 15° or more and 75° or less, and more preferably 30° or more and 60° or less.

[0044] 3, the opening edge 25a of the base material discharge port 25 includes a second inclined portion R2 that is inclined with respect to a direction (plane) G perpendicular to the conveying direction when viewed in the thickness direction. The second inclined portion R2 is made up of a surface of the first block 21 on the downstream side in the conveying direction and a surface of the second block 22 on the downstream side in the conveying direction.

[0045] 3, the second inclined portion R2 is provided on the other widthwise side of the first block 21 and the second block 22 (a pair of blocks) when viewed in the thickness direction, i.e., on the exposed opening 29 side in the widthwise direction. In detail, the second inclined portion R2 is obtained by chamfering the corners of the first block 21 and the second block 22 on the other widthwise side (exposed opening 29 side) and on the downstream side in the conveying direction.

[0046] The second inclined portion R2 faces the other widthwise side, i.e., the side of the exposed opening 29 in the widthwise direction, as viewed in the thickness direction. Furthermore, the second inclined portion R2 extends to one widthwise side, i.e., the side opposite the exposed opening 29 in the widthwise direction, as it extends from the upstream side to the downstream side in the conveying direction as viewed in the thickness direction.

[0047] When viewed in the thickness direction, the second inclined portion R2 is inclined at a second inclination angle θ2 toward the downstream side in the conveying direction with respect to a direction G perpendicular to the conveying direction. The second inclination angle θ2 is, for example, preferably 15° or more and 75° or less, and more preferably 30° or more and 60° or less.

[0048] (Coating mode) By driving the coating liquid supply pump 41, the coating liquid C is supplied from the coating liquid supply port 31 to the liquid reservoir 23 via the coating liquid supply pipe 42 and the coating liquid supply path 33. With the coating liquid C stored in the liquid reservoir 23, the substrate 2 is passed through the liquid reservoir 23 while the coating liquid C is supplied to the liquid reservoir 23 via the coating liquid supply port 31. As a result, the coating liquid C is applied to both surfaces of the substrate 2, and a coating film F is formed on both surfaces of the substrate 2.

[0049] A portion of the coating liquid C supplied to the liquid reservoir 23 through the coating liquid supply port 31 is discharged as a coating film F from the liquid reservoir 23 together with the substrate 2 through the substrate discharge port 25. The remainder of the coating liquid C is discharged from the liquid reservoir 23 by a coating liquid discharge mechanism (not shown).

[0050] As shown in Figures 3 and 4, one widthwise side 2a of the substrate 2 is a specific region P to which the coating liquid C is applied. On the other hand, the other widthwise side 2b of the substrate 2 is a non-specific region Q to which the coating liquid C is not applied. When the substrate 2 is passed through the liquid reservoir 23, the non-specific region Q (the other widthwise side 2b) of the substrate 2 is protruded to the outside of the liquid reservoir 23 through the exposure opening 29. As a result, the coating liquid C is applied to both surfaces of the specific region P (one widthwise side 2a) of the substrate 2, and a coating film F is formed on both surfaces of the specific region P of the substrate 2. On the other hand, the coating liquid C is not applied to both surfaces of the non-specific region Q (the other widthwise side 2b) of the substrate 2, and therefore no coating film F is formed thereon.

[0051] 3, the slit 3 is provided on one widthwise side 2a of the substrate 2, and is therefore included in the specific region P. Therefore, the coating liquid C is also applied to the inner surface of the slit 3, and a coating film F is formed. Furthermore, the side surface 2c on one widthwise side of the substrate 2 is also included in the specific region P. Therefore, the coating liquid C is also applied to the side surface 2c on one widthwise side of the substrate 2, and a coating film F is formed.

[0052] When the substrate 2 is discharged from the liquid reservoir 23 through the substrate discharge outlet 25, a strong shear force is applied to the coating liquid C applied to both sides of the substrate 2 near the substrate discharge outlet 25. For this reason, as shown in Fig. 5, the thickness dimension T of the substrate 2 including the coating film F becomes slightly smaller than the gap dimension H of the substrate discharge outlet 25 (liquid reservoir 23).

[0053] 18 is a schematic diagram showing the mechanism by which defects occur in a coating film F formed on a substrate 2 in a conventional coating device 20'. This coating device 20' was developed by the present inventors.

[0054] In the coating device 20', the opening edge 25a of the substrate discharge port 25 extends perpendicular to the conveyance direction when viewed in both the width direction and the thickness direction. That is, the opening edge 25a of the substrate discharge port 25 does not include either the first inclined portion R1 or the second inclined portion R2. For simplicity, FIG. 18 only shows the opening edge 25a of the substrate discharge port 25 as viewed in the width direction. The other configurations are the same as those of the coating device 20 according to this embodiment.

[0055] As shown in FIG. 18, in the coating device 20′, when the slit 3 in the substrate 2 passes through the liquid reservoir 23, the coating liquid C fills the slit 3 in the substrate 2 and blocks the slit 3 (bridge phenomenon).

[0056] In particular, when the transport speed of the substrate 2 is high, a strong shear force is applied to the coating liquid C applied to both sides of the substrate 2 when the substrate 2 is discharged from the substrate discharge port 25. This causes a tailing phenomenon in which the coating liquid C flows in the opposite direction to the transport direction of the substrate 2. Therefore, when the transport speed of the substrate 2 is high, the slit 3 is more likely to be blocked by the coating liquid C.

[0057] Next, when the slit 3 of the substrate 2 is discharged from the liquid reservoir 23 through the substrate discharge outlet 25, the coating liquid C filled in the slit 3 spreads over the opening edge 25a of the substrate discharge outlet 25 (as the liquid drains), and adheres to and remains on the opening edge 25a of the substrate discharge outlet 25.

[0058] Next, with the coating liquid C remaining at the opening edge 25a of the substrate discharge port 25, the slit edge K immediately behind (immediately upstream from) the slit 3 is discharged from the liquid pool 23 via the substrate discharge port 25.

[0059] At this time, the coating liquid C remaining at the opening edge 25a of the substrate discharge port 25 swells up at the slit edge K immediately behind (immediately upstream of) the slit 3. That is, the coating film F formed on both sides of the slit edge K becomes thick.

[0060] As a result, in the conventional coating device 20', the thickness distribution of the coating film F formed on both sides of the substrate 2 becomes uneven in the conveying direction (resulting in defects in the coating film F). Specifically, the thickness of the coating film F formed on the front (downstream) portion of the substrate between two adjacent slits 3 in the conveying direction (the slit edge K immediately behind the slit 3) becomes thicker.

[0061] Furthermore, in the conventional coating device 20', the fact that the slits 3 in the substrate 2 are blocked by the coating liquid C is itself undesirable, as it has the effect of reducing breathability and the like.

[0062] Therefore, in the coating device 20 according to this embodiment, in order to prevent defects in the coating film F formed on the substrate 2, a first inclined portion R1 and a second inclined portion R2 are provided at the opening edge 25a of the substrate discharge outlet 25, which are inclined with respect to a direction G perpendicular to the conveying direction.

[0063] Specifically, as shown in Figure 3, the second inclined portion R2 extends to one side in the width direction, i.e., the opposite side to the exposure opening 29 in the width direction, as it extends from the upstream side to the downstream side in the conveying direction when viewed in the thickness direction.

[0064] Therefore, as shown in Figure 3, the slit 3 of the substrate 2 passing through the liquid reservoir 23 is discharged from the substrate discharge outlet 25 at the base end 3a side on the other widthwise side (the exposed opening 29 side) before the tip end 3b side on one widthwise side (the opposite side to the exposed opening 29).

[0065] The coating liquid C filled in the slit 3 then moves along the second inclined portion R2 (in the flow direction J) from the base end 3a side (the other side in the width direction) to the tip end 3b side (one side in the width direction), causing the liquid to dry out. This eliminates the state in which the slit 3 is blocked by the coating liquid C (bridge phenomenon).

[0066] Furthermore, the second inclined portion R2 allows the coating liquid C filled in the slit 3 to be sufficiently spread to the side surface 2c on one side in the width direction of the substrate 2. As a result, the coating liquid C is sufficiently applied to the side surface 2c of the substrate 2, and lack of coating on the side surface 2c of the substrate 2 is suppressed.

[0067] Varying the second inclination angle θ2 changes the movement speed (draining speed) of the coating liquid C flowing along the second inclined portion R2. When the second inclination angle θ2 is small, the draining speed of the coating liquid C increases. On the other hand, when the second inclination angle θ2 is large, the draining speed of the coating liquid C decreases.

[0068] On the other hand, as shown in Figures 2 and 5, the first inclined portion R1 extends outward in the thickness direction, i.e., on the opposite side of the liquid pool portion 23 in the thickness direction, as it extends from the upstream side to the downstream side in the conveying direction when viewed in the width direction.

[0069] Therefore, when the slit 3 of the substrate 2 is discharged from the liquid reservoir 23 through the substrate discharge port 25, the first inclined portion R1 acts as a wall, so that even if the slit 3 is blocked with the coating liquid C, the coating liquid C filled in the slit 3 is less likely to wet and spread over the opening edge 25a of the substrate discharge port 25 (the liquid is less likely to run off). This makes it less likely that the coating liquid C will adhere to the opening edge 25a of the substrate discharge port 25. Furthermore, the frictional force generated between the coating liquid C and the first inclined portion R1 can also contribute to suppressing adhesion of the coating liquid C to the opening edge 25a.

[0070] This prevents the coating film F formed on both sides of the slit edge K from becoming thick, which would otherwise occur if the coating liquid C piled up at the slit edge K (see FIG. 18) immediately behind (immediately upstream of) the slit 3. This also prevents the thickness of the coating film F formed on both sides of the substrate 2 from becoming uneven in the conveyance direction.

[0071] (Action and effect) As described above, according to this embodiment, as shown in FIG. 3, the coating liquid C filled in the slit 3 drains from the base end 3a side (the other side in the width direction) to the tip end 3b side (one side in the width direction) along the second inclined portion R2 (in the flow direction J), thereby eliminating the state in which the slit 3 is blocked with the coating liquid C.

[0072] Furthermore, the second inclined portion R2 allows the coating liquid C filled in the slit 3 to spread sufficiently to the side surface 2c on one side of the width direction of the substrate 2, thereby preventing the coating from missing from reaching the side surface 2c of the substrate 2.

[0073] 2 and 5, the first inclined portion R1 functions as a wall, so that even if the slit 3 is blocked with the coating liquid C, the coating liquid C filled in the slit 3 is less likely to adhere to the opening edge 25a of the substrate discharge port 25. This prevents the coating liquid C from puffing up at the slit edge K (see FIG. 18) immediately behind (immediately upstream from) the slit 3, making it possible to make the thickness distribution of the coating film F formed on both sides of the substrate 2 uniform in the conveyance direction.

[0074] The coating device 20 according to this embodiment is particularly effective when the substrate 2 has a comb-tooth shape.

[0075] In this embodiment, the exposed opening 29 is provided on at least one side surface 26 in the width direction, so that a part of the substrate 2 in the width direction can be protruded from the exposed opening 29 to the outside of the liquid reservoir 23. This makes it possible to selectively form a coating film F on both sides of a specific portion P in the width direction of the substrate 2 being transported.

[0076] <Second embodiment> A coating device 20 according to a second embodiment will be described with reference to Fig. 6. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0077] In this embodiment, the second inclined portion R2 is formed in a curved shape so that, as viewed in the thickness direction, it changes from the direction G perpendicular to the conveying direction to the conveying direction X as it moves from the upstream side to the downstream side in the conveying direction. The second inclined portion R2 is convex toward one side in the width direction and toward the upstream side in the conveying direction.

[0078] The second inclination angle θ2 is the angle between a tangent to the curved second inclined portion R2 and a direction G perpendicular to the conveying direction. The second inclination angle θ2 changes according to the conveying direction. The second inclination angle θ2 is approximately zero on the upstream side in the conveying direction (the base end 3a side), and approximately 90° on the downstream side in the conveying direction (the tip end 3b side). That is, the second inclined portion R2 is approximately perpendicular to the conveying direction (≒ G) on the upstream side in the conveying direction (the base end 3a side), and is approximately in the conveying direction (≒ X) on the downstream side in the conveying direction (the tip end 3b side). The other configurations are the same as those of the first embodiment.

[0079] According to this embodiment, the coating liquid C drains faster on the base end 3a side of the slit 3, while the coating liquid C drains slower on the tip end 3b side of the slit 3. For this reason, the coating liquid C is less likely to remain on the base end 3a side of the slit 3, but is more likely to remain on the tip end 3b side of the slit 3.

[0080] Therefore, this is effective when it is desired to make the coating film F thicker on the tip end 3b side of the slit 3 than on the base end 3a side of the slit 3. Also, changing the radius of curvature of the second inclined portion R2 changes the speed at which the coating liquid C drains. Furthermore, because the second inclined portion R2 is curved, the coating liquid C drains more smoothly.

[0081] <Third embodiment> A coating device 20 according to a third embodiment will be described with reference to Fig. 7. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0082] In this embodiment, contrary to the second embodiment, the second inclined portion R2 is formed in a curved shape so that, as viewed in the thickness direction, it changes from the conveying direction X to a direction G perpendicular to the conveying direction as it moves from the upstream side to the downstream side in the conveying direction. The second inclined portion R2 is convex toward the other widthwise side and the downstream side in the conveying direction.

[0083] The second inclination angle θ2 is approximately 90° on the upstream side in the conveying direction (the side of the base end 3a), and approximately zero on the downstream side in the conveying direction (the side of the tip end 3b). That is, the second inclined portion R2 is approximately in the conveying direction (≒X) on the upstream side in the conveying direction (the side of the base end 3a), and is approximately perpendicular to the conveying direction (≒G) on the downstream side in the conveying direction (the side of the tip end 3b). The other configurations are the same as those of the second embodiment.

[0084] According to this embodiment, the coating liquid C drains at a slower rate on the base end 3a side of the slit 3, while the coating liquid C drains at a faster rate on the tip end 3b side of the slit 3. For this reason, the coating liquid C tends to remain on the base end 3a side of the slit 3, but does not tend to remain on the tip end 3b side of the slit 3.

[0085] Therefore, this is effective when it is desired to make the coating film F on the base end portion 3a side of the slit 3 thicker than the coating film F on the tip end portion 3b side of the slit 3.

[0086] <Fourth embodiment> A coating device 20 according to a fourth embodiment will be described with reference to Fig. 8. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0087] In this embodiment, the first inclined portion R1 is formed in a curved shape so that, as viewed in the width direction, it changes from a direction G perpendicular to the conveying direction to the conveying direction X as it moves from the upstream side to the downstream side in the conveying direction. The first inclined portion R1 is convex outward in the thickness direction and toward the upstream side in the conveying direction.

[0088] The first inclination angle θ1 is the angle between a tangent to the curved first inclined portion R1 and a direction G perpendicular to the conveying direction. The first inclination angle θ1 changes according to the conveying direction. The first inclination angle θ1 is approximately zero on the upstream side of the conveying direction, and approximately 90° on the downstream side of the conveying direction. That is, the first inclined portion R1 is approximately perpendicular to the conveying direction (≒ G) on the upstream side of the conveying direction, and is approximately in line with the conveying direction (≒ X) on the downstream side of the conveying direction. The other configurations are the same as those of the first embodiment.

[0089] According to this embodiment, the gap between the opening edge 25a of the substrate discharge outlet 25 and the liquid pool 23 is large on the upstream side of the first inclined portion R1 in the transport direction. This is therefore effective when it is desired to cause the coating liquid C to drain off at the opening edge 25a of the substrate discharge outlet 25.

[0090] <Fifth embodiment> A coating device 20 according to a fifth embodiment will be described with reference to Fig. 9. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0091] In this embodiment, unlike the fourth embodiment, the first inclined portion R1 is formed in a curved shape so that it changes from the conveying direction X to a direction G perpendicular to the conveying direction as it moves from the upstream side to the downstream side in the conveying direction when viewed in the width direction. The first inclined portion R1 is convex toward the inside in the thickness direction and toward the downstream side in the conveying direction.

[0092] The first inclination angle θ1 is approximately 90° on the upstream side in the conveying direction, and approximately zero on the downstream side in the conveying direction. That is, the first inclined portion R1 is approximately in the conveying direction (≒X) on the upstream side in the conveying direction, and is approximately perpendicular to the conveying direction (≒G) on the downstream side in the conveying direction. The other configurations are the same as those of the fourth embodiment.

[0093] According to this embodiment, the gap between the opening edge 25a of the substrate discharge outlet 25 and the liquid pool 23 is narrower on the upstream side of the first inclined portion R1 in the transport direction. This is more advantageous in preventing the coating liquid C from adhering to the opening edge 25a of the substrate discharge outlet 25.

[0094] In addition, since the frictional force generated between the coating liquid C and the first inclined portion R1 is increased, leakage of the coating liquid C from the substrate discharge outlet 25 is suppressed, thereby improving the coverage of the coating liquid C on both sides of the substrate 2.

[0095] Sixth Embodiment A coating device 20 according to a sixth embodiment will be described with reference to Fig. 10. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0096] In this embodiment, the second inclined portion R2 forms a recess N1 that is recessed toward the upstream side in the conveying direction when viewed in the thickness direction. The recess N1 has a substantially triangular shape with an apex N1a on the upstream side in the conveying direction when viewed in the thickness direction. In detail, the two second inclined portions R2 extend from the apex N1a of the recess N1 as a starting point to both outer sides in the width direction and toward the downstream side in the conveying direction. The other configurations are the same as those of the first embodiment.

[0097] According to this embodiment, the coating liquid C filled in the slit 3 flows from both the base end 3a side (the other side in the width direction) and the tip end 3b side (one side in the width direction) along the two second inclined portions R2 (in the flow direction J) toward the apex N1a of the recess N1. As a result, the coating liquid C becomes concentrated at the apex N1a of the recess N1.

[0098] Therefore, the coating liquid C can be actively applied to the portion of the substrate 2 that passes through the apex N1a of the recess N1. For example, it is conceivable to actively apply the coating liquid C to the portion of the substrate 2 where the coating film F is likely to become thin (such as a warped portion).

[0099] 10, the second inclined portion R2 may form a convex portion N2 that protrudes downstream in the conveying direction when viewed in the thickness direction. When viewed in the thickness direction, the convex portion N2 has a substantially triangular shape with an apex N2a on the downstream side in the conveying direction. Specifically, the two second inclined portions R2 extend from the apex N2a of the convex portion N2 to both outer sides in the width direction and upstream in the conveying direction.

[0100] According to this, the coating liquid C filled in the slit 3 flows from the apex N2a of the convex portion N2 toward the base end portion 3a side (the other side in the width direction) and the tip end portion 3b side (one side in the width direction) along the two second inclined portions R2 (in the flow direction J) into the widthwise side portions N2b of the convex portion N2. As a result, the coating liquid C becomes concentrated in the widthwise side portions N2b of the convex portion N2.

[0101] Therefore, similarly to the case of the apex N1a of the recess N1, the coating liquid C can be applied actively to the portion of the substrate 2 that passes through both side portions N2b in the width direction of the protrusion N2.

[0102] The recessed portions N1 and the protruding portions N2 may be formed, for example, in a trapezoidal shape, a semicircular shape, etc. Furthermore, a plurality of recessed portions N1 and a plurality of protruding portions N2 may be arranged alternately in the width direction.

[0103] Seventh Embodiment A coating device 20 according to the seventh embodiment will be described with reference to Fig. 11. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0104] In this embodiment, contrary to the first embodiment, the second inclined portion R2 faces one widthwise side when viewed in the thickness direction, i.e., the side opposite to the exposed opening 29 in the widthwise direction. Furthermore, the second inclined portion R2 extends to the other widthwise side, i.e., toward the exposed opening 29, as it extends from the upstream side to the downstream side in the conveying direction when viewed in the thickness direction. The other configurations are the same as those of the first embodiment.

[0105] According to this embodiment, the slit 3 of the substrate 2 passing through the liquid reservoir 23 is discharged from the substrate discharge outlet 25 at the tip end 3b side on one side in the width direction (opposite the exposed opening 29) before the base end 3a side on the other side in the width direction (the exposed opening 29 side).

[0106] Then, the coating liquid C filled in the slit 3 is drained by moving along the second inclined portion R2 (in the flow direction J) from the tip end 3b side (one side in the width direction) to the base end 3a side (the other side in the width direction).

[0107] This is effective when it is desired to apply the coating liquid C more actively toward the base end 3a side of the slit 3 than toward the tip end 3b side.

[0108] Eighth Embodiment A coating device 20 according to an eighth embodiment will be described with reference to Fig. 12. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0109] In this embodiment, the width dimension L2 of the liquid reservoir 23 (each of the blocks 21, 22) narrows from the substrate inlet 24 side (upstream side) to the substrate discharge outlet 25 side (downstream side) in the conveying direction. That is, the cross-sectional area of ​​the liquid reservoir 23 decreases from the substrate inlet 24 side to the substrate discharge outlet 25 side in the conveying direction. The cross-sectional area (width dimension L2) of the substrate discharge outlet 25 is smaller than the cross-sectional area (width dimension L2) of the substrate inlet 24. The other configurations are the same as those of the first embodiment.

[0110] According to this embodiment, the pressure loss of the coating liquid C at the substrate discharge port 25 is greater than the pressure loss of the coating liquid C at the substrate inlet 24. Therefore, the coating liquid C in the liquid reservoir 23 is less likely to leak out from the substrate discharge port 25. This makes it possible to prevent the coating liquid C from adhering to the opening edge 25a of the substrate discharge port 25.

[0111] <Ninth embodiment> A coating device 20 according to the ninth embodiment will be described with reference to Fig. 13. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0112] In this embodiment, the gap dimension H of the liquid reservoir 23 (the gap dimension between the first block 21 and the second block 22) narrows from the substrate inlet 24 side (upstream side) to the substrate discharge outlet 25 side (downstream side) in the conveying direction. In other words, the cross-sectional area of ​​the liquid reservoir 23 decreases from the substrate inlet 24 side to the substrate discharge outlet 25 side in the conveying direction. The other configurations are the same as those of the eighth embodiment.

[0113] According to this embodiment, the same effects as those of the eighth embodiment can be obtained.

[0114] <Tenth embodiment> A coating device 20 according to a tenth embodiment will be described with reference to Fig. 14. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0115] In this embodiment, a coating liquid outlet 32 ​​serving as a coating liquid discharge section is provided on the surface of the side block 27 on one side in the width direction that faces the liquid reservoir 23. The coating liquid outlet 32 ​​discharges the coating liquid C from the liquid reservoir 23.

[0116] A coating liquid recovery pump (coating liquid suction pump) 51 and a coating liquid discharge pipe 52 in a coating liquid discharge device (coating liquid suction device) 50 are provided outside first block 21, second block 22 and side block 27.

[0117] As the coating liquid recovery pump 51, it is preferable to use, for example, a pump capable of discharging a fixed amount, such as a screw pump, a diaphragm pump, a syringe pump, or a tube pump, or a vacuum exhaust pump whose pressure is appropriately controlled by a regulator.

[0118] A coating liquid discharge channel 34 is provided inside side block 27 so as to correspond to coating liquid discharge port 32. Coating liquid discharge channel 34 communicates with coating liquid recovery pump 51 on its downstream side via coating liquid discharge pipe 52, and communicates with coating liquid discharge port 32 on its upstream side. Coating liquid discharge channel 34 extends approximately straight in the width direction.

[0119] The coating liquid outlet 32 ​​is disposed at a position overlapping the second inclined portion R2 in the transport direction. The other configurations are the same as those in the first embodiment.

[0120] According to this embodiment, the coating liquid C that has drained from the base end 3a side (the other widthwise side) of the slit 3 to the tip end 3b side (one widthwise side) is discharged to the outside of the liquid reservoir 23 via the coating liquid outlet 32. This makes it possible to prevent the coating film F formed on the substrate 2 from becoming non-uniform, which would otherwise occur if the drained coating liquid C were to adhere to part of the substrate 2.

[0121] As shown by the two-dot chain line in Figure 14, the coating liquid discharge section may be formed by arranging an opening 52a of a coating liquid discharge pipe 52 connected to a coating liquid recovery pump 51 at a position that overlaps with the second inclined section R2 in the transport direction.

[0122] <Eleventh embodiment> A coating device 20 according to an eleventh embodiment will be described with reference to Fig. 15. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0123] In this embodiment, a coating liquid outlet 32 ​​serving as a coating liquid discharge section is provided on the surfaces of the first block 21 and the second block 22 facing the liquid reservoir 23. The coating liquid outlet 32 ​​discharges the coating liquid C from the liquid reservoir 23.

[0124] A coating liquid discharge channel 34 is provided inside first block 21 and second block 22 so as to correspond to coating liquid discharge port 32. Coating liquid discharge channel 34 communicates with coating liquid recovery pump 51 on its downstream side via coating liquid discharge pipe 52, and communicates with coating liquid discharge port 32 on its upstream side. Coating liquid discharge channel 34 extends approximately straight in the thickness direction.

[0125] The coating liquid outlet 32 ​​is disposed at a position overlapping the first inclined portion R1 in the transport direction. The other configurations are the same as those in the tenth embodiment.

[0126] According to this embodiment, excess coating liquid C near the substrate discharge port 25 is discharged from the liquid reservoir 23 via the coating liquid discharge port 32. This makes it possible to prevent the coating liquid C from adhering to the opening edge 25a of the substrate discharge port 25.

[0127] <Twelfth embodiment> A coating device 20 according to a twelfth embodiment will be described with reference to Fig. 16. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0128] In this embodiment, the exposure opening 29 is not provided in either the first side surface portion 26a or the second side surface portion 26b. That is, both the first side surface portion 26a and the second side surface portion 26b (side surface portions on both sides in the width direction) are closed. The first side surface portion 26a and the second side surface portion 26b are formed by the side surfaces facing the liquid reservoir portion 23 of the two side blocks 27 that cover both sides of the liquid reservoir portion 23 in the width direction.

[0129] The width dimension B of the substrate 2 is smaller than the width dimension L2 of each block 21, 22 (the width dimension of the liquid reservoir 23). Furthermore, the entire width of the substrate 2 is designated as a specific region P, and no non-specific region Q is provided. In other words, the coating liquid C is applied to both sides of the substrate 2 in the entire width direction, forming a coating film F (full coating). Furthermore, the coating liquid C is also applied to the side surfaces 2c on both sides of the substrate 2 in the width direction, forming a coating film F.

[0130] The first inclined portion R1 is provided on the inner side in the thickness direction (liquid reservoir portion 23 side) and downstream side in the transport direction of the first block 21 and the second block 22. The other configurations are the same as those of the first embodiment.

[0131] According to this embodiment, even if both the first side surface portion 26a and the second side surface portion 26b are blocked, adhesion of the coating liquid C to the opening edge portion 25a of the substrate discharge outlet 25 can be suppressed.

[0132] As shown by the two-dot chain line in Figure 16, the coating liquid supply port 31 (coating liquid supply path 33) may be provided in the first side surface portion 26a or the second side surface portion 26b (side block 27) rather than in the first block 21 and the second block 22.

[0133] <Thirteenth embodiment> A coating device 20 according to the thirteenth embodiment will be described with reference to Fig. 17. In the following description, the same components as those in the above embodiments will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0134] In this embodiment, a flow rate adjustment valve 60 is provided between the coating liquid supply pump 41 and the coating liquid supply port 31. More specifically, the flow rate adjustment valve 60 is provided in the coating liquid supply pipe .

[0135] Furthermore, the coating liquid supply pump 41 and the flow rate adjustment valve 60 are each connected to a control unit 70 serving as a coating liquid adjustment mechanism. The control unit 70 is configured, for example, by a microcomputer and a program.

[0136] The control unit 70 adjusts (controls) the supply pressure of the coating liquid C by the coating liquid supply pump 41, i.e., the supply pressure of the coating liquid C supplied to the liquid reservoir 23 via the coating liquid supply port 31. The control unit 70 also adjusts (controls) the flow rate of the coating liquid C flowing through the coating liquid supply pipe 42, i.e., the supply amount of the coating liquid C supplied to the liquid reservoir 23 via the coating liquid supply port 31, by adjusting the throttling amount of the flow rate adjustment valve 60.

[0137] The control unit 70 adjusts the supply pressure of the coating liquid C from the coating liquid supply pump 41 so that when the coating liquid supply port 31 faces the slit 3 provided in the substrate 2 (second mode M2), the supply pressure of the coating liquid C from the coating liquid supply port 31 is lower than when the coating liquid supply port 31 does not face the slit 3, specifically when the coating liquid supply port 31 faces the substrate main body portion U (first mode M1). For example, when the coating liquid supply port 31 faces the slit 3, the supply pressure of the coating liquid C from the coating liquid supply port 31 is set to zero.

[0138] Similarly, by adjusting the throttling amount of the flow rate adjustment valve 60, the control unit 70 reduces the amount of coating liquid C supplied from the coating liquid supply port 31 when the coating liquid supply port 31 faces the slit 3 provided in the substrate 2 (second mode M2) compared to when the coating liquid supply port 31 does not face the slit 3, specifically when the coating liquid supply port 31 faces the substrate main body portion U (first mode M1). For example, when the coating liquid supply port 31 faces the slit 3, the amount of coating liquid C supplied from the coating liquid supply port 31 is set to zero.

[0139] The control unit 70 may adjust only one of the supply pressure and supply amount of the coating liquid C supplied to the liquid reservoir 23 via the coating liquid supply port 31.

[0140] According to this embodiment, by intermittently supplying the coating liquid C from the coating liquid supply port 31 to the liquid reservoir 23, it is possible to prevent the slit 3 from being blocked by the coating liquid C.

[0141] <Other embodiments> Although the present disclosure has been described above with reference to preferred embodiments, such description is not limiting and various modifications are possible.

[0142] The coating liquid supply port 31 may be provided in only one of the first block 21 and the second block 22. Alternatively, the coating liquid supply port 31 may be provided in only the first side surface portion 26a or the second side surface portion 26b, without being provided in the first block 21 or the second block 22. In other words, it is sufficient that the coating liquid supply port 31 is provided in at least one of the pair of blocks (at least one of the pair of blocks) and the side surface portion.

[0143] The opening edge 25a of the base material discharge port 25 may be parallel to the direction G perpendicular to the conveying direction when viewed in either the width direction or the thickness direction. In other words, the opening edge 25a of the base material discharge port 25 may include an inclined portion that is inclined with respect to the direction G perpendicular to the conveying direction when viewed in at least one of the width direction or the thickness direction.

[0144] The inclined portion may be provided on the surface of the opening edge 25a of the base material discharge port 25 that is downstream of the side block 27 in the conveyance direction.

[0145] The exposed openings 29 may be provided on both side surface portions 26 in the width direction (both the first side surface portion 26a and the second side surface portion 26b). Each of the both end portions in the width direction of the substrate 2 may be made to protrude from the liquid reservoir portion 23 via each exposed opening 29 as a non-specific portion Q.

[0146] In the above embodiment, the conveying direction of the substrate 2 is horizontal, but is not limited to this. The substrate 2 may be conveyed, for example, vertically from top to bottom, vertically from bottom to top, or even obliquely.

[0147] In the above embodiment, the coating device 20 is used to apply the coating liquid C to both sides of the substrate 2 that is continuously transported by a roll-to-roll method, but is not limited to this. The coating device 20 may also be used, for example, to apply the coating liquid C to both sides of a glass substrate that is transported by a belt conveyor.

[0148] In the coating method according to the present disclosure, a coating device 20 is used to pass a substrate 2 having openings 3 formed therein through a liquid reservoir 23 .

[0149] Furthermore, in the coating method according to the present disclosure, when the coating device 20 is used, the supply amount and / or supply pressure of the coating liquid C from the coating liquid supply port 31 is reduced when the coating liquid supply port 31 faces the opening 3 compared to when the coating liquid supply port 31 does not face the opening 3. The supply amount and / or supply pressure of the coating liquid C may be adjusted manually, without using the control unit 70. [Example]

[0150] <Setting conditions> Example 1 The substrate 2 was made of SUS304 material with a thickness of 0.1 mm and a width of 20 mm. Slits 3 (see Figure 3) with a width dimension d1 of 10 mm and an opening width d2 of 0.5 mm were provided in the substrate 2 at intervals of 20 mm in the conveying direction. The substrate 2 was comb-shaped. The slits 3 were provided on one side of the substrate 2 in the width direction. The amount of warping of the substrate 2 was 0.002 mm in the thickness direction between the center part in the width direction and both ends in the width direction.

[0151] A conductive paste with a viscosity η of approximately 100 Pa·s was used as coating liquid C. The viscosity η of coating liquid C was measured using a rotational viscometer (Thermo Scientific Mars40, manufactured by HAAKE). The measurement conditions for viscosity η were a stage diameter of 20 mm, a probe diameter of 20 mm, an angle of 1°, a measurement gap of 0.05 mm, a shear rate of 1 / s, and a measurement temperature of 25°C.

[0152] The coating device 20 (see FIGS. 1 to 5) according to the first embodiment was used. However, the opening edge 25a of the substrate discharge port 25 was provided with only the second inclined portion R2, without the first inclined portion R1. Specifically, a tabletop coating device (Minilab, manufactured by Yasui Seiki Co., Ltd.) was used as the coating device 20. The first block 21 and the second block 22 were made of SUS304 material. The length dimension L1 of each block 21, 22 was 40 mm, the width dimension L2 was 50 mm, and the thickness dimension L3 was 10 mm. The second inclination angle θ2 was 60°.

[0153] Three circular coating liquid supply ports 31 with a diameter of 1.0 mm were arranged at equal intervals in the transport direction at positions 5 mm away from the other widthwise end (second side surface portion 26b, exposed port 29) of each block 21, 22 on one widthwise side.

[0154] A Mohno pump (3HMC010F, manufactured by Heishin Soubi) was used as the coating liquid supply pump 41. The unwinding torque and winding torque of the substrate supply device 10 were both set to 60 N·m.

[0155] After forming the coating film F, it was dried for 30 minutes using a hot air drying oven (DKM-400, manufactured by Yamato Scientific) at a set temperature of 200°C and a fan rotation speed of 500 rpm to obtain a dried film.

[0156] The gap dimension H between the first block 21 and the second block 22 was set to 0.2 mm using a SUS304 shim. The coating speed (conveying speed) was set to 0.3 m per minute, and the substrate was conveyed horizontally so that the thickness direction of the substrate was oriented vertically.

[0157] Example 2 The coating device 20 (see FIGS. 1 to 5) according to the first embodiment was used. However, the opening edge 25a of the substrate discharge port 25 was provided with only the first inclined portion R1, without the second inclined portion R2. The first inclination angle θ1 was set to 30°. The other configurations were the same as those in Example 1.

[0158] (Comparative Example) The coating device 20 (see FIGS. 1 to 5) according to the first embodiment was used. However, neither the first inclined portion R1 nor the second inclined portion R2 was provided on the opening edge portion 25a of the substrate discharge port 25. The other configurations were the same as those of the examples.

[0159] <Measurement conditions> The thickness of the coating film F was measured using a micrometer (Mitutoyo). The film thickness was calculated by subtracting the thickness dimension t of the substrate 2 before the coating film F was formed from the thickness dimension T of the substrate 2 after the coating film F was formed (see Figure 5). The average film thickness was calculated from the measurements taken at five points at 5 mm intervals in the coating direction (transport direction). The film thickness variation was calculated by calculating the standard deviation 3σ from the five measurements and dividing this by the average film thickness (expressed as a percentage).

[0160] <Measurement results> Example 1 The average film thickness was 18.9 μm, the film thickness variation was 25%, and the surface roughness was 4.6 μm.

[0161] Example 2 The average film thickness was 26.4 μm, the film thickness variation was 33%, and the surface roughness was 8.1 μm.

[0162] (Comparative Example) The average film thickness was 50.4 μm, the film thickness variation was 35%, and the surface roughness was 10.3 μm. [Industrial Applicability]

[0163] The present disclosure is applicable to a coating apparatus and a coating method, and is therefore extremely useful and has high industrial applicability. [Explanation of symbols]

[0164] X conveying direction Y width direction Z thickness direction P Specific part Q Non-specific parts C Coating liquid F Paint film G Direction perpendicular to the conveying direction R1 1st slope R2 2nd slope part θ1 1st inclination angle θ2 2nd inclination angle J Flow direction N1 recess N2 convex part 1 Coating system 2 Base material 3 Slit (opening) 3a Proximal end 3b Tip 20 Coating equipment 21 Block 1 (pair of blocks) 22 Second Block (Pair of Blocks) 23 Liquid reservoir (gap) 24 Substrate inlet 25 Base material outlet 25a Opening edge 26 Side part 26a 1st side part 26b Second side part 27 Side Block 29 Exposed mouth 31 Coating liquid supply port 32 Coating liquid discharge port (coating liquid discharge part) 41 Coating fluid supply pump 51 Coating fluid recovery pump 52 Coating liquid discharge pipe 52a Opening (coating liquid discharge part) 60 Flow control valve 70 Control unit (coating fluid adjustment mechanism)

Claims

1. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, The opening edge portion includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in the width direction.

2. The coating device according to claim 1, The inclined portion extends, as viewed in the width direction, from the upstream side to the downstream side in the conveying direction toward the opposite side from the liquid pool portion in the thickness direction.

3. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, The opening edge portion includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in the thickness direction.

4. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, an exposure opening extending from the base material inlet to the base material outlet is provided in at least one side surface portion in the width direction, a portion of the substrate in the width direction can protrude from the exposure opening to the outside of the liquid reservoir.

5. The coating device according to claim 4, the inclined portion faces the exposed opening side in the width direction when viewed in the thickness direction, and extends to the opposite side of the exposed opening in the width direction as it extends from the upstream side to the downstream side in the conveying direction.

6. The coating device according to claim 4, The inclined portion faces the opposite side of the exposed opening in the width direction when viewed in the thickness direction, and extends toward the exposed opening as it extends from the upstream side to the downstream side in the conveying direction.

7. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, the inclined portion is formed in a curved shape so as to change from a direction perpendicular to the conveying direction to a direction parallel to the conveying direction as it moves from the upstream side to the downstream side in the conveying direction, as viewed in at least one of the width direction and the thickness direction.

8. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, comprising: a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, the inclined portion is formed in a curved shape so as to change from the conveying direction to a direction perpendicular to the conveying direction as it moves from the upstream side to the downstream side in the conveying direction, as viewed in at least one of the width direction and the thickness direction.

9. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, comprising: a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, The coating device, wherein the inclined portion forms a recess that is recessed toward the upstream side in the conveying direction or a protrusion that protrudes toward the downstream side in the conveying direction.

10. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, comprising: a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, a coating liquid discharge section that discharges the coating liquid from the liquid reservoir section is disposed at a position that overlaps with the inclined section in the transport direction.

11. The coating device according to any one of claims 1 to 10, a cross-sectional area of ​​the liquid reservoir portion decreasing from the substrate inlet side toward the substrate outlet side in the conveying direction.

12. 12. The coating device according to claim 1, At least one of the pair of blocks and the side surface portions is provided with a coating liquid supply port that faces the liquid reservoir and supplies the coating liquid to the liquid reservoir.

13. A coating device that applies a coating liquid to both sides of a sheet-like substrate being conveyed, comprising: a pair of blocks facing each other in a thickness direction of the base material; a liquid pool formed in a gap between the pair of blocks so that the coating liquid can be pooled and through which the substrate can pass, The liquid reservoir is a substrate inlet opening upstream in a conveyance direction of the substrate and through which the substrate is introduced; a substrate discharge port that opens downstream in the conveying direction and through which the substrate is discharged; side portions located on both sides in a width direction intersecting the conveying direction, an opening edge portion of the base material discharge port includes an inclined portion that is inclined with respect to a direction perpendicular to the conveying direction when viewed in at least one of the width direction and the thickness direction, a coating liquid supply port facing the liquid reservoir and supplying the coating liquid to the liquid reservoir is provided in at least one of the pair of blocks and the side surface portion; a coating liquid adjusting mechanism for adjusting the supply amount and / or supply pressure of the coating liquid supplied to the liquid reservoir through the coating liquid supply port, The coating device, wherein the coating liquid adjustment mechanism reduces the supply amount and / or the supply pressure of the coating liquid from the coating liquid supply port when the coating liquid supply port faces an opening provided in the substrate, compared to when the coating liquid supply port does not face the opening.

14. A coating method, comprising passing the substrate provided with an opening through the liquid reservoir using the coating device according to claim 13.

15. The coating method according to claim 14, a coating method in which, when the coating liquid supply port faces the opening, the supply amount and / or supply pressure of the coating liquid from the coating liquid supply port is reduced compared to when the coating liquid supply port does not face the opening.

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