Spacer shim, and slot die coater equipped with said spacer shim

Abstract

The present invention discloses a spacer shim configured to allow simultaneous coating of multiple coating liquids. A spacer shim according to one aspect of the invention is a shim body having the shape of a plate having a predetermined width, length, and thickness, and includes a shim body having a first surface having the width and length, the shim body including a flow channel portion comprising an inlet trench made of a groove recessed in the thickness direction on the first surface and configured for a first coating liquid to flow in along the thickness direction, and a discharge trench made of a groove recessed in the thickness direction on the first surface and configured for the first coating liquid to be discharged along the length direction, and an inlet portion at one end of the first surface in the width direction consisting of a groove recessed in the thickness direction.

Description

Technical Field

[0001] The present invention relates to a spacer shim, a slot die coater, and a coating method using the same, and more particularly to a spacer shim configured to simultaneously coat a plurality of coating liquids, a slot die coater including the same, and a coating method using the slot die coater.

[0002] This application claims priority based on Korean Patent Application No. 10-2023-0102447 filed on August 4, 2023, and all the contents disclosed in the specification and drawings of the application are incorporated herein by reference.

Background Art

[0003] Slot die coaters are widely used to coat active materials and insulating materials on battery electrode plates. A slot die coater includes a spacer shim interposed between two slot die blocks.

[0004] The spacer shim forms a flow path portion within the slot die coater. The flow path portion includes an inflow path portion through which a coating liquid flows in from the outside and a discharge path portion through which the coating liquid is ejected to the outside.

[0005] <​​​​​​​​​​​​​​The present invention was made to solve the above problems, and the problem that the present invention aims to solve is to provide a spacer shim configured to allow multiple coating liquids to be applied simultaneously.

[0008] Another technical problem that the present invention aims to solve is to provide a slot die coater that includes an improved spacer shim.

[0009] Another technical problem that the present invention aims to solve is to provide a coating method using a slot die coater that includes an improved spacer shim. [Means for solving the problem]

[0010] A first spacer shim according to one aspect of the present invention for solving the above-mentioned problems is a shim body having the shape of a plate having a predetermined width, length, and thickness, and includes a shim body having a first surface having the width and length, wherein the shim body includes a flow channel portion including an inlet trench made of a groove recessed in the thickness direction on the first surface and configured to allow a first coating liquid to flow in along the thickness direction, and a discharge trench made of a groove recessed in the thickness direction on the first surface and configured to discharge the first coating liquid along the length direction, and an inlet portion at one end of the first surface in the width direction consisting of a groove recessed in the thickness direction.

[0011] The inlet can be opened in the width and length directions of the shim body.

[0012] The flow channel portion is formed on the inside of the first surface, The inlet portion may be formed on the first surface along the width direction, outside the flow path portion.

[0013] The inlet portion may be formed outward from the discharge trench along the width direction.

[0014] The inlet can be separated from the discharge trench by at least a portion thereof.

[0015] The inlet portion may come into contact with the discharge trench at its end along the longitudinal direction.

[0016] The depth of the inlet may be approximately the same as the depth of the discharge trench.

[0017] The inlet and the discharge trench extend along the longitudinal direction, The inlet portion may have an expanded portion whose end along the longitudinal direction is widened in the direction toward the discharge trench.

[0018] The inlet portion may have an end portion along its length that gradually widens in that length.

[0019] The shim body is positioned in the direction from which the first coating liquid is discharged, and the second surface having the aforementioned thickness may have a stepped portion formed by the region in contact with the first surface and the adjacent region being recessed inward along the longitudinal direction of the shim body.

[0020] The stepped portion may be provided in a region corresponding to the region where the inlet portion and the discharge trench are located.

[0021] A slot die coater according to another aspect of the present invention for solving the above-mentioned problems may include a first spacer shim according to the present invention, a second spacer shim provided on one side of the first spacer, a first slot die block coupled to one side of the shim body so as to face the exposed surface of the flow path, and a second slot die block coupled to the other side of the shim body so as to face the first slot die block.

[0022] At least a portion of the second coating liquid discharged from the second spacer shim may be configured to flow into the inlet of the adjacent first spacer shim.

[0023] The shim body is located in the direction in which the first coating liquid is discharged, and a stepped portion can be formed in which a region where the second surface forming the thickness contacts the first surface and an adjacent region thereof are recessed inward along the length direction of the shim body.

[0024] The first coating liquid discharged from the first spacer shim and the second coating liquid discharged from the second spacer shim can be discharged in a state of contacting each other at the stepped portion.

Advantages of the Invention

[0025] According to one aspect of the present invention, a plurality of coating liquids can be coated simultaneously. In particular, when it is necessary to coat a plurality of coating liquids adjacent to each other, the first coating liquid can be discharged from the discharge trench, and the second coating liquid can be discharged from an inflow portion adjacent thereto. Therefore, by replacing the process of individually coating a plurality of coating liquids with a process of simultaneously coating them, the speed of the coating process can be improved. In addition, when performing the process of individually coating, problems such as misalignment or difficulty in aligning the alignment along the direction in which the coating liquid is discharged due to coating tolerance can be solved by simultaneously coating.

[0026] According to another aspect of the present invention, the first coating liquid discharged from the first spacer film and the second coating liquid discharged from the second spacer film are discharged in a state of being in contact with each other. Therefore, it is possible to improve the accuracy of the coating process in which the first coating liquid and the second coating liquid are arranged side by side in a state of being in contact with each other. In particular, in the process of arranging and coating the first coating liquid and the second coating liquid in a state of being in contact with each other, alignment along the direction in which the coating liquid is discharged needs to be accurately achieved. If this does not match, there are problems such as the first coating liquid and the second coating liquid being coated in a non-contact state, or one coating liquid invading the portion where the other coating liquid should be coated. However, according to such a configuration of the present invention, such problems can be solved.

[0027] According to still another aspect of the present invention, the second coating liquid discharged from the second spacer film does not come into sudden contact with the first coating liquid discharged from the first spacer film, but comes into contact with a gradually widening width, thereby preventing the problem that the first coating liquid and the second coating liquid are mixed due to sudden contact.

[0028] The following drawings attached to this specification illustrate desirable embodiments of the present invention and serve to further understand the technical idea of the present invention together with the detailed description of the invention. Therefore, the present invention should not be construed as being limited only to the matters described in the drawings.

Brief Description of the Drawings

[0029] [Figure 1] It is a plan view showing a first spacer film according to the present invention. [Figure 2] It is a perspective view showing a first spacer film according to the present invention. [Figure 3] It is a view showing an enlarged part of FIG. 2. [Figure 4] It is a view showing an enlarged part of FIG. 3. [Figure 5] This is a front view showing the first spacer shim according to the present invention. [Figure 6] This is a part of a side view showing the first spacer shim according to the present invention. [Figure 7] This figure shows a slot die coater according to the present invention. [Figure 8] This figure shows a first spacer shim and a second spacer shim included in the slot die coater according to the present invention. [Figure 9] This figure shows how the slot die coater according to the present invention coats a substrate. [Modes for carrying out the invention]

[0030] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Identical reference numerals indicate identical components. In addition, the thickness, proportions, and dimensions of components in the drawings may be exaggerated for the sake of effective explanation of the technical content.

[0031] Terms and words used in this specification and in the claims are not to be interpreted in their ordinary and dictionary sense, but rather in a sense and concept appropriate to the technical idea of ​​the present invention, in accordance with the principle that the inventor himself may appropriately define the concept of a term in order to best describe the invention.

[0032] In this specification, terms indicating directions such as up, down, left, right, front, and back are used, but such terms are for explanatory convenience and it will be obvious to those skilled in the art that they may change depending on the position of the object in question, the position of the observer, etc.

[0033] Therefore, it should be understood that the configurations shown in the embodiments described herein represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention, and that there are various equivalents and modifications that can be substituted therein at the time of filing this application.

[0034] Figure 1 is a plan view showing the first spacer shim 10 according to the present invention. Figure 2 is a perspective view showing the first spacer shim 10 according to the present invention.

[0035] Referring to Figures 1 and 2, the first spacer shim 10 includes a shim body 100 which includes a flow channel 110 and an inlet 120.

[0036] For the sake of explanation, the drawing shows a three-dimensional coordinate system. The X-axis extends in the width direction of the shim body 100, the Y-axis extends in the length direction of the shim body 100, and the Z-axis extends in the thickness direction of the shim body 100.

[0037] The shim body 100 may be in the shape of a plate having a predetermined width, length, and thickness. The shim body 100 may have a first surface having the said width and length. The first surface may be located in the positive direction of the Z axis and parallel to the XY plane.

[0038] The shim body 100 may include a flow path section 110 and an inlet section 120.

[0039] The flow path section 110 may include an inlet trench 111 and a discharge trench 112. The flow path section 110 may be formed on the inside of the first surface. The flow path section 110 may be formed on the inside of the first surface in the width direction. The flow path section 110 may be formed on the inside of the first surface in the length direction, except for the end of the discharge trench 112 from which the first coating liquid is discharged.

[0040] The inlet trench 111 consists of a groove recessed in the thickness direction on its first surface, and can be configured to allow the first coating liquid to flow in along the thickness direction. Referring to Figure 7 in conjunction with Figures 1 and 2, the inlet trench 111 can communicate with the coating liquid supply section 7 and manifold 9 of the slot die coater 1, which will be described later.

[0041] The discharge trench 112 consists of a groove recessed in the thickness direction on its first surface and may be configured to discharge the first coating liquid along its length. The discharge trench 112 may have an open end to allow the first coating liquid to discharge along the length of the shim body 100. The discharge trench 112 may be provided at one end of the shim body 100 in the length direction. The discharge trench 112 may communicate with the inlet trench 111. The first coating liquid that has flowed in through the inlet trench 111 may be discharged into the discharge trench 112.

[0042] As shown in Figure 1, the discharge trenches 112 are provided on both sides in the width direction of the shim body 100, and can have a symmetrical structure with respect to the length direction of the shim body 100. However, the discharge trenches 112 may also be provided on only one of the two sides in the width direction of the shim body 100.

[0043] The inlet 120 may consist of a groove recessed in the thickness direction of the shim body 100 at one end in the width direction of the first surface. The inlet 120 may be open in the width and length directions of the shim body 100. That is, the inlet 120 may be a groove recessed in the thickness direction of the shim body 100, provided at the width and length ends of the first surface, and open in the width and length directions of the shim body 100. The inlet 120 may be open in a length direction equal to the length direction of the shim body 100 from which the discharge trench 112 is open. At least a portion of the second coating liquid discharged from the second spacer shim 20 of the slot die coater 1, which will be described later, can flow into the inlet 120.

[0044] As shown in Figure 1, the inlet 120 is provided on both sides of the shim body 100 in the width direction and can have a symmetrical structure with respect to a central axis that passes through the center of the shim body 100 in the width direction and is parallel to the length direction of the shim body 100. However, in contrast, the inlet 120 may be provided on only one of the two sides of the shim body 100 in the width direction. The inlet 120 may be formed along the width direction of the shim body 100, outside the discharge trench 112.

[0045] According to this configuration of the present invention, multiple coating liquids can be applied simultaneously. In particular, when it is necessary to apply multiple coating liquids adjacent to each other, the first coating liquid can be discharged from the discharge trench 112, and the second coating liquid can be discharged from the adjacent inlet 120. Therefore, by replacing the process of individually coating multiple coating liquids with a process of simultaneous coating, the speed of the coating process can be improved. Furthermore, when performing the individual coating process, the alignment along the direction in which the coating liquids are discharged can be misaligned or difficult to align due to coating tolerances, but this problem can be solved by coating simultaneously.

[0046] Figure 3 is a magnified view of a portion of Figure 2. Figure 4 is a magnified view of a portion of Figure 3.

[0047] The detailed structure of the inlet 120 will be described with reference to Figures 3 and 4.

[0048] The inlet 120 and discharge trench 112 may extend along the longitudinal direction of the shim body 100. The inlet 120 may be separated from the discharge trench 112 in at least a portion of its length. The end of the inlet 120 along the longitudinal direction of the shim body 100 may be in contact with the discharge trench 112. That is, the inlet 120 and the discharge trench 112 may be separated along the longitudinal direction of the shim body 100 and in contact only at their ends. However, it is also possible to configure the inlet 120 and the discharge trench 112 to be in contact inside one end of the shim body 100 in the longitudinal direction. The inlet 120 and the discharge trench 112 may be configured to be separated from each other in part along the width direction of the shim body 100, and the width of the inlet 120 and / or discharge trench 112 may be extended so that they are in contact with each other at or in areas adjacent to the ends along the longitudinal direction of the shim body 100.

[0049] With this configuration of the present invention, the first coating liquid discharged from the first spacer shim 10 and the second coating liquid discharged from the second spacer shim 20 are discharged in contact with each other. Therefore, the accuracy of the coating process, in which the first coating liquid and the second coating liquid should be applied side by side in contact, can be improved. In particular, in the process in which the first coating liquid and the second coating liquid should be applied side by side in contact, it is necessary to ensure accurate alignment along the direction in which the coating liquids are discharged. However, when such accurate alignment cannot be achieved, problems can arise such as the first coating liquid and the second coating liquid not being in contact with each other during coating, or one coating liquid penetrating the area that should be coated by the other coating liquid. With this configuration of the present invention, these problems can be solved.

[0050] Referring again to Figures 3 and 4, the inlet 120 may have an expanded portion A at the end along the longitudinal direction of the shim body 100, where its width is expanded in the direction toward the discharge trench 112. The inlet 120 may extend along the longitudinal direction of the shim body 100 to have a constant width, and have an expanded portion A at the end where its width is expanded. The expanded portion A may have various structures, such as a structure in which its width is abruptly expanded in a multi-stage manner, or a structure in which its width is gradually expanded in a tapered manner. For example, as shown in Figure 4, if the end of the inlet 120 along the longitudinal direction of the shim body 100 gradually widens along the longitudinal direction of the shim body 100, the discharge width of the second coating liquid discharged from the second spacer shim 20 will gradually expand rather than abruptly expand toward the first coating liquid discharged from the first spacer shim 10, thus preventing the problem of the first coating liquid and the second coating liquid mixing due to abrupt expansion of the discharge width of the first coating liquid.

[0051] Figure 5 is a front view showing the first spacer shim 10 according to the present invention.

[0052] Referring to Figure 5, the depth of the inlet 120 may be approximately the same as the depth of the discharge trench 112. The depth of the inlet 120 along the thickness direction of the shim body 100 may be approximately the same as the depth of the discharge trench 112 along the thickness direction of the shim body 100. In such a case, the first coating liquid discharged from the first spacer shim 10 and the second coating liquid discharged from the second spacer shim 20 are discharged at different heights, preventing the problem of one coating liquid getting under the other or overlapping and coating the surface.

[0053] Figure 6 is a partial side view showing the first spacer shim 10 according to the present invention.

[0054] Referring to Figure 6 in conjunction with Figures 2 and 5, the shim body 100 can have a stepped portion 130.

[0055] The stepped portion 130 may be located in the direction from which the first coating liquid is discharged. The stepped portion 130 may be formed on the second surface that forms the thickness of the shim body 100, with the region in contact with the first surface and its adjacent regions recessed inward along the longitudinal direction of the shim body 100. The stepped portion 130 may be configured such that the portion located lower along the thickness direction (parallel to the Z-axis) of the second surface protrudes further outward along the longitudinal direction of the shim body 100 than the portion located upper. The stepped portion 130 may be formed along the entire width direction of the shim body 100 on the second surface. However, the stepped portion 130 may be provided only in the region corresponding to the region where the inlet portion 120 and discharge trench 112 are located. That is, the stepped portion 130 may be provided only on one side and / or both ends of the shim body 100.

[0056] With this configuration of the present invention, the first coating liquid discharged from the discharge trench 112 and the second coating liquid discharged from the inlet 120 can be discharged in a state where they fall onto the stepped portion 130 and come into contact with each other. Compared to the case where the coating liquid is discharged directly from the discharge trench 112 and the inlet 120, the possibility that the first coating liquid and the second coating liquid will not come into contact with each other can be greatly reduced because the coating liquid falls downward along the thickness direction of the shim body 100 due to gravity and is discharged.

[0057] Referring again to Figures 1 and 2, the first spacer shim 10 may include fastening holes 140 for connection with the slot die coater 1, which will be described later.

[0058] At least one fastening hole 140 may be provided so as to penetrate the shim body 100 without overlapping with the flow channel portion 110.

[0059] The fastening holes 140 may be used when installing the first spacer shim 10 into the slot die coater 1. The inner circumference of the fastening holes 140 may be provided with threads for bolt fastening. At least one fastening hole 140 may be provided in the inner region of the shim body 100. At least two or more fastening holes 140 may be provided in the inner region of the shim body 100.

[0060] Figure 7 shows a slot die coater 1 according to the present invention.

[0061] Referring to Figure 7, the slot die coater 1 may include the first spacer shim 10 described above. The slot die coater 1 may also include a second spacer shim 20, a first slot die block 3, and a second slot die block 5.

[0062] The second spacer shim 20 may be provided on one side of the first spacer shim 10. The second spacer shim 20 may be provided on both sides of the first spacer shim 10. The second spacer shim 20 may be provided in areas where simultaneous coating of the first coating liquid discharged from the first spacer shim 10 and the second coating liquid discharged from the second spacer shim 20 is required. When the second spacer shim 20 is provided on one side of the first spacer shim 10, the discharge trench 112 of the first spacer shim 10 located in the portion where the second spacer shim 20 is not provided may be blocked so that the first coating liquid is not discharged.

[0063] The first slot die block 3 can be coupled to one side of the shim body 100 so as to face the exposed surface of the flow channel 110.

[0064] The second slot die block 5 can be coupled to the other side of the shim body 100 so as to face the first slot die block 3.

[0065] The first slot die block 3 may include a coating liquid supply unit 7 that communicates with the inlet trench 111 of the first shim spacer. However, the coating liquid supply unit 7 may be provided externally.

[0066] Although the detailed structure of the coating liquid supply unit 7 is not shown, it may include, for example, a coating liquid introduction chamber recessed in the thickness direction (parallel to the Z-axis) of the first slot die block 3, a coating liquid inlet hole communicating with the coating liquid introduction chamber and drilled in the thickness direction (parallel to the Z-axis) of the first slot die block 3, and a coating liquid supply pipe, one end of which is connected to the coating liquid inlet hole and the other end of which is connected to a pump.

[0067] The slot die coater 1 can be supplied with coating liquid using multiple pumps P1 and P2. The number of pumps may correspond to the number of first spacer shims 10 and second spacer shims 20. Each pump can independently supply coating liquid to each spacer shim via the coating liquid supply unit 7. However, the number of pumps P1 and P2 is not necessarily limited to the number of first spacer shims 10 and second spacer shims 20; for example, the pump supplying coating liquid to the second spacer can be a single, interconnected pump.

[0068] The manifold 9 is provided on the first slot die block 3 or the second slot die block 5 and is configured to contain the coating liquid in its internal space. For example, the manifold 9 is provided on the upper first slot die block 3 and has a hollow semi-cylindrical structure, with the semicircular outer circumference located at the top and the rectangular outer circumference located at the bottom, facing the first spacer shim 10 and the second spacer shim 20. Such a manifold 9 is connected to the coating liquid supply unit 7 to receive the coating liquid. Once the manifold 9 is completely filled with coating liquid, the coating liquid can flow along the first spacer shim 10 and the second spacer shim 20.

[0069] The first slot die block 3 and the second slot die block 5 can be connected by at least one bolt fastening structure B.

[0070] Although the detailed structure of bolt fastening structure B is not shown, it may include, for example, a bolt fastening hole formed in the first slot die block 3 with a screw thread formed on its inner circumference, a bolt guide hole formed in the second slot die block 5 to guide bolt insertion from the outside, and a bolt inserted through the bolt guide hole and coupled to the bolt fastening hole.

[0071] The detailed structure of bolt fastening structure B is not limited thereto. Bolt fastening holes may be formed in the second slot die block 5, and bolt guide holes may be formed in the first slot die block 3. In addition, various bolt fastening structures B known in the art can be employed.

[0072] The coating liquid discharged from the slot die coater 1 can be continuously discharged onto the surface of the substrate D, which is being transported by the roller R.

[0073] Figure 8 shows the first spacer shim 10 and the second spacer shim 20 included in the slot die coater 1 according to the present invention. Figure 9 shows the process of the slot die coater 1 according to the present invention coating the substrate D.

[0074] Referring to Figures 8 and 9, the slot die coater 1 can include a plurality of first spacer shims 10 and second spacer shims 20. The slot die coater 1 can include seven first spacer shims 10 and six second spacer shims 20. The first spacer shims 10 and second spacer shims 20 can be arranged at regular intervals along the X-axis.

[0075] The slot die coater 1 can simultaneously form a number of first coating layers C1 corresponding to twice the number of first spacer shims 10, and a number of second coating layers C2 corresponding to once the number of second spacer shims 20, on the surface of the substrate D as it advances in the Y-axis direction, along the direction of the substrate's advancement. However, the discharge trench 112 of the outermost first spacer shim 10 can be formed to be closed.

[0076] With this structure, at least a portion of the second coating liquid discharged from the second spacer shim 20 flows into the inlet 120 of the adjacent first spacer shim 10, allowing the first and second coating liquids to coat each other simultaneously in contact. When the central second coating layer C2 and the first coating layers C1 in contact with the second coating layer C2 on both sides are considered as one coating layer set, six coating layer sets are coated, and by cutting approximately in the center of the second coating layer C2 and the center of the adjacent coating layer sets, twelve electrodes can be used in the production process of the electrode assembly.

[0077] The following describes the coating method using the slot die coater 1.

[0078] The coating method according to the present invention may include the steps of: preparing a substrate D having a pair of short sides and a pair of long sides extending between the pair of short sides; preparing a slot die coater 1 according to the present invention; and using the slot die coater 1, a second coating liquid discharged from a second spacer shim 20 at predetermined intervals along the long side direction (direction parallel to the X axis) on one surface of the substrate D, forming a plurality of second coating layers C2, while a strip-shaped plain portion extending along the long side direction (direction parallel to the X axis) is formed between adjacent second coating layers C2 in the short side direction (direction parallel to the Y axis), and simultaneously, a first coating liquid discharged from a first spacer shim 10 forms a first coating layer C1 along the long side direction (direction parallel to the X axis) that covers the boundary between each second coating layer C2 and the adjacent plain portion with a predetermined width. In such a coating method, the substrate D may be a metal foil current collector, the first coating layer C1 may be an insulating coating layer, and the second coating layer C2 may be an active material coating layer.

[0079] As described above, the present invention has been described primarily with reference to the attached drawings, but it will be clear to those skilled in the art that a variety of obvious modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should be interpreted as being defined by the claims, which are written to include such a wide range of modifications. [Explanation of Symbols]

[0080] 1-Slot Die Coater 3. First slot die block 5. Second slot die block 7 Coating liquid supply unit 9 Manifold 10. First spacer shim 20. Second spacer shim 100 sim bodies 110 Flow channel section 111 Inlet Trench 112 Discharge Trench 120 Inlet 130 Step section 140 Fastening hole A Expansion section B Bolt fastening structure C1 First coating layer C2 Second coating layer D Base material P1 Pump P2 Pump R Roller

Claims

1. A shim body having the shape of a plate having a predetermined width, length, and thickness, and a first spacer shim including the shim body having a first surface having the width and length, The aforementioned shim body is A flow path section including an inlet trench consisting of a groove recessed in the thickness direction on the first surface and configured for the first coating liquid to flow in along the thickness direction, and a discharge trench consisting of a groove recessed in the thickness direction on the first surface and configured for the first coating liquid to be discharged along the length direction, An inlet portion consisting of a groove recessed in the thickness direction at one end in the width direction of the first surface, The first spacer shim, including the above.

2. The aforementioned inlet section is The first spacer shim according to claim 1, which is open in the width and length directions of the shim body.

3. The aforementioned flow channel section is Formed on the inside of the first surface, The aforementioned inlet section is The first spacer shim according to claim 1, formed on the first surface outward from the flow channel portion along the width direction.

4. The aforementioned inlet section is The first spacer shim according to claim 1, formed outward from the discharge trench along the width direction.

5. The aforementioned inlet section is The first spacer shim according to claim 4, wherein at least a portion of it is separated from the discharge trench.

6. The aforementioned inlet section is The first spacer shim according to claim 5, wherein the end along the longitudinal direction is in contact with the discharge trench.

7. The first spacer shim according to claim 1, wherein the depth of the inlet is substantially the same as the depth of the discharge trench.

8. The inlet and the discharge trench are Extending along the aforementioned longitudinal direction, The first spacer shim according to claim 1, wherein the inlet portion has an expanded portion whose end along the longitudinal direction is widened in the direction toward the discharge trench.

9. The aforementioned inlet section is The first spacer shim according to claim 8, wherein the end along the longitudinal direction gradually widens in width along the longitudinal direction.

10. The aforementioned shim body is The first spacer shim according to claim 1, which is located in the direction from which the first coating liquid is discharged and has a stepped portion formed by the second surface having the thickness of the first surface having a region in contact with the first surface and an adjacent region thereof being recessed inward along the longitudinal direction of the shim body.

11. The aforementioned stepped portion is The first spacer shim according to claim 10, provided in a region corresponding to the region where the inlet and discharge trench are located.

12. A first spacer shim according to any one of claims 1 to 11, A second spacer shim is provided on one side of the first spacer shim, A first slot die block is coupled to one side of the shim body so as to face the exposed surface of the flow path portion, A second slot die block is coupled to the other side of the shim body so as to face the first slot die block, Slot die coater, including.

13. The slot die coater according to claim 12, wherein at least a portion of the second coating liquid discharged from the second spacer shim is configured to flow into the inlet of the adjacent first spacer shim.

14. The aforementioned shim body is The slot die coater according to claim 12, wherein the second surface having the aforementioned thickness has a stepped portion formed by being recessed inward along the longitudinal direction of the shim body, in a region that contacts the first surface and an adjacent region thereof, located in the direction from which the first coating liquid is discharged.

15. The first coating liquid discharged from the first spacer shim and the second coating liquid discharged from the second spacer shim are The slot die coater according to claim 14, wherein the die is discharged in a state of contact with each other at the stepped portion.

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