Spacing gasket and groove die coating machine

Abstract

According to the present invention, a spacer gasket configured to apply a plurality of coating solutions simultaneously is disclosed. A spacer gasket according to one aspect of the present invention comprises a plate-shaped gasket body having a predetermined width, length, and thickness, and having a first surface having the width and the length, in which the gasket body comprises: a flow path portion comprising an inlet groove and a discharge groove, the inlet groove and the discharge groove being formed in the flow path portion; an inlet groove composed of grooves recessed from the first surface in the thickness direction and configured to allow the first coating liquid to be introduced in the thickness direction, and a discharge groove composed of grooves recessed from the first surface in the thickness direction and configured to allow the first coating liquid to be discharged in the longitudinal direction; and an inlet portion composed of a groove recessed in the thickness direction at one end of the first surface in the width direction.

Description

Technical Field

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

[0002] This application is based on and claims the benefit of priority from Korean Patent Application No. 10-2023-0102447 filed on August 4, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. Background Art

[0003] Slot die coaters are widely used to coat active materials or insulating materials on electrode plates of batteries.Slot die coaters include spacers inserted between two slot modules.

[0004] The spacer forms a flow path portion in the slot die coater. The flow path portion includes an inlet flow path portion through which a coating liquid is introduced from the outside and an outlet flow path portion through which the coating liquid is ejected to the outside.

[0005] In the past, after an active material is coated on an electrode plate, an insulating material is coated on the end of the active material coated region.

[0006] However, when such processes are performed simultaneously, the production speed of the battery can be increased, and thus a spacer capable of coating both the active material and the insulating material on the electrode plate at the same time is required. Summary of the invention

[0007] Technical issues

[0008] The present disclosure is designed to solve the problems of the related art, and thus the present disclosure is directed to providing a spacer configured to simultaneously coat a plurality of coating liquids.

[0009] The present disclosure is also directed to providing a slot die coater including an improved spacer.

[0010] The present disclosure is further directed to providing a coating method using a slot die coater including an improved spacer.

[0011] Technical Solution

[0012] According to one aspect of the present disclosure, a first spacing gasket for solving the above-mentioned problem may include: a gasket body having a plate shape with a predetermined width, length and thickness, and including a first surface having the width and the length, wherein the gasket body includes: a flow path portion, including an inlet groove and a discharge groove, the inlet groove being formed as a groove recessed in the thickness direction on the first surface and configured to allow the first coating liquid to flow in along the thickness direction, the discharge groove being formed as 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 formed as a groove recessed in the thickness direction at one end of the first surface in the width direction.

[0013] The inlet portion may be open in the width direction and the length direction of the gasket body.

[0014] The flow path portion may be formed on an inner side of the first surface, and

[0015] The inlet portion may be formed on the first surface further outward than the flow path portion in the width direction.

[0016] The inlet portion may be formed further outward than the discharge groove in the width direction.

[0017] The inlet portion may be at least partially spaced apart from the discharge channel.

[0018] The inlet portion may contact the discharge groove at an end portion in the length direction.

[0019] The depth of the inlet portion may be substantially the same as the depth of the discharge groove.

[0020] The inlet portion and the discharge groove may extend in a length direction, and

[0021] The inlet portion may have an expanded portion that expands in width in a direction in which an end portion along the length direction faces the discharge groove.

[0022] In the inlet portion, the end portion along the length direction may be gradually widened in width along the length direction.

[0023] The gasket body may have a step portion located in a direction in which the first coating liquid is discharged and formed by a region intersecting the first surface on the second surface forming the thickness and a region adjacent to the region being recessed inwardly along a length direction of the gasket body.

[0024] The step portion may be provided in a region corresponding to a region in which the inlet portion and the discharge groove are located.

[0025] According to another aspect of the present disclosure, a slot die coating machine for solving the above-mentioned problems may include: a first spacer gasket according to the present disclosure; a second spacer gasket arranged on one side of the first spacer gasket; a first slot module connected to one side of the gasket body to face the exposed surface of the flow path portion; and a second slot module connected to the other side of the gasket body to face the first slot module.

[0026] At least a portion of the second coating liquid discharged from the second spacer may be configured to flow into an inlet portion of an adjacent first spacer.

[0027] The gasket body may have a step portion located in a direction in which the first coating liquid is discharged and formed by a region intersecting the first surface on the second surface forming the thickness and a region adjacent to the region being recessed inwardly along a length direction of the gasket body.

[0028] The first coating liquid discharged from the first spacer and the second coating liquid discharged from the second spacer may be discharged in contact with each other at the step portion.

[0029] Beneficial Effects

[0030] According to one aspect of the present disclosure, multiple coating liquids can be applied simultaneously. In particular, when multiple coating liquids need to be applied adjacent to each other, a first coating liquid can be discharged from a discharge groove, and a second coating liquid can be discharged from an inlet portion adjacent thereto. Therefore, the speed of the coating process can be increased by replacing a process of applying multiple coating liquids individually with a process of applying multiple coating liquids simultaneously. In addition, in the case of a separate coating process, depending on the coating tolerance, the problem of misalignment or difficulty in alignment along the direction in which the coating liquids are discharged can be solved by simultaneous coating.

[0031] According to another aspect of the present disclosure, the first coating liquid discharged from the first spacer and the second coating liquid discharged from the second spacer are discharged in a manner of contacting each other. Therefore, the accuracy of the coating process in which the first coating liquid and the second coating liquid should be coated side by side while contacting each other can be improved. In particular, the process in which the first coating liquid and the second coating liquid should be coated side by side while contacting each other requires accurate alignment according to the direction in which the coating liquids are discharged, so if this cannot be done, there are problems such as the first coating liquid and the second coating liquid being coated without contacting each other or one coating liquid invading the part where the other coating liquid should be coated, and this configuration of the present disclosure can solve these problems.

[0032] According to another aspect of the present disclosure, the second coating liquid discharged from the second spacer gasket does not quickly contact the first coating liquid discharged from the first spacer gasket, but contacts with a gradually widening width, thereby preventing the problem of mixing of the first coating liquid and the second coating liquid due to rapid contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a plan view showing a first spacer according to the present disclosure.

[0034] Figure 2 is a perspective view showing a first spacer according to the present disclosure.

[0035] Figure 3 It is shown Figure 2 A magnified view of a local area.

[0036] Figure 4 It is shown Figure 3 A magnified view of a local area.

[0037] Figure 5 is a front view showing a first spacer according to the present disclosure.

[0038] Figure 6 is a portion of a side view showing a first spacer according to the present disclosure.

[0039] Figure 7 is a diagram showing a slot die coater according to the present disclosure.

[0040] Figure 8 is a diagram illustrating a first spacer and a second spacer included in a slot die coater according to the present disclosure.

[0041] Fig. 9 is a diagram showing coating of a substrate by a slot die coater according to the present disclosure. DETAILED DESCRIPTION

[0042] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Since the drawings in this specification illustrate preferred embodiments of the present disclosure and are used together with the detailed description of the present disclosure described later to further understand the technical aspects of the present disclosure, the present disclosure should not be construed as being limited to the contents shown in these drawings. The same reference numerals refer to the same components. In addition, in the drawings, the thickness, ratio, and size of the components may be exaggerated in order to effectively describe the technical content.

[0043] It should be understood that the terms used in the specification and the appended claims should not be interpreted as limited to the general meaning and dictionary meaning, but should be interpreted based on the meaning and concept corresponding to the technical aspects of the present disclosure, based on the principle of allowing the inventor to appropriately define the terms for the best interpretation.

[0044] Terms indicating directions such as up, down, left, right, front, and rear as used herein are used only for convenience of description, and it is obvious to those skilled in the art that the terms may vary depending on positions of elements or observers.

[0045] Therefore, the descriptions presented herein are merely preferred examples for illustrative purposes, and are not intended to limit the scope of the present disclosure, and it should be appreciated that other equivalents and modifications may be made thereto without departing from the scope of the present disclosure.

[0046] Figure 1 is a plan view showing a first spacer 10 according to the present disclosure. Figure 2 is a perspective view showing a first spacer 10 according to the present disclosure.

[0047] Reference Figure 1 and Figure 2 The first spacer gasket 10 includes a gasket body 100 including a flow path portion 110 and an inlet portion 120 .

[0048] The X-axis extends in the width direction of the gasket body 100 , the Y-axis extends in the length direction of the gasket body 100 , and the Z-axis extends in the thickness direction of the gasket body 100 .

[0049] The gasket body 100 may have a plate shape with a predetermined width, length, and thickness. The gasket body 100 may include a first surface having a width and a length. The first surface may be located in the positive direction of the Z axis and may be a surface parallel to the XY plane.

[0050] The gasket body 100 may include a flow path portion 110 and an inlet portion 120 .

[0051] The flow path portion 110 may include an inlet groove 111 and a discharge groove 112. The flow path portion 110 may be formed on the inner side of the first surface. The flow path portion 110 may be formed on the inner side of the first surface in the width direction. The flow path portion 110 may be formed on the inner side of the first surface in the length direction except for the end of the discharge groove 112 that discharges the first coating liquid.

[0052] The inlet groove 111 may be formed as a groove recessed in the thickness direction on the first surface and may be configured to allow the first coating liquid to flow in along the thickness direction. Figure 7 as well as Figure 1 and Figure 2 , the inlet groove 111 may be communicated with the coating liquid supply unit 7 and the manifold 9 of the slot die coater 1 which will be described later.

[0053] The discharge groove 112 may be formed as a groove recessed in the thickness direction on the first surface and may be configured to discharge the first coating liquid along the length direction. The discharge groove 112 may have an open end so that the first coating liquid is discharged along the length direction of the gasket body 100. The discharge groove 112 may be disposed at one end of the gasket body 100 in the length direction. The discharge groove 112 may be communicated with the inlet groove 111. The first coating liquid introduced through the inlet groove 111 may be discharged to the discharge groove 112.

[0054] The discharge groove 112 is as follows Figure 1 The drain groove 112 is provided on both sides of the gasket body 100 in the width direction and may have a bilaterally symmetrical structure based on the length direction of the gasket body 100. However, the drain groove 112 may be provided on only one side of both sides of the gasket body 100 in the width direction.

[0055] The inlet portion 120 may be formed as a groove recessed in the thickness direction of the gasket body 100 at one end of the first surface in the width direction. The inlet portion 120 may be open toward the width direction and the length direction of the gasket body 100. That is, the inlet portion 120 may be provided at the end of the first surface in the width direction and the length direction, and may be in the form of a groove recessed in the thickness direction of the gasket body 100 to open toward the width direction and the length direction of the gasket body 100. The inlet portion 120 may be open in the same length direction as the length direction of the gasket body 100 where the discharge groove 112 opens. At least a portion of the second coating liquid discharged from the second spacer gasket 20 of the slot die coater 1 to be described later may flow into the inlet portion 120.

[0056] The inlet portion 120 is provided on both sides of the gasket body 100 in the width direction, such as Figure 1 As shown, and may have a left-right symmetrical structure based on a central axis that passes through the center of the gasket body 100 in the width direction and is parallel to the length direction of the gasket body 100. However, unlike this, the inlet portion 120 may be provided on only one side of the gasket body 100 in the width direction. The inlet portion 120 may be formed further outward than the discharge groove 112 along the width direction of the gasket body 100.

[0057] According to this configuration of the present disclosure, multiple coating liquids can be applied simultaneously. Specifically, when multiple coating liquids need to be applied adjacent to each other, the first coating liquid can be discharged from the discharge groove 112, and the second coating liquid can be discharged from the inlet portion 120 adjacent to the discharge groove 112. Therefore, the speed of the coating process can be increased by replacing the process of applying multiple coating liquids separately with the process of applying multiple coating liquids simultaneously. In addition, in the case of a separate coating process, depending on the coating tolerance, the problem of misalignment or difficulty in alignment along the direction in which the coating liquid is discharged can be solved by simultaneous coating.

[0058] Figure 3 It is shown Figure 2 A magnified view of a local area. Figure 4 It is shown Figure 3 A magnified view of a local area.

[0059] Will refer to Figure 3 and Figure 4 The detailed structure of the inlet portion 120 is described.

[0060] The inlet portion 120 and the discharge groove 112 may extend along the length direction of the gasket body 100. The inlet portion 120 may be at least partially spaced apart from the discharge groove 112. The inlet portion 120 may contact the discharge groove 112 at the end along the length direction of the gasket body 100. That is, the inlet portion 120 and the discharge groove 112 may be spaced apart along the length direction of the gasket body 100 and may contact only at the end. However, in contrast thereto, the inlet portion 120 and the discharge groove 112 may also be configured to intersect more inwardly than one end of the length direction of the gasket body 100. The inlet portion 120 and the discharge groove 112 are configured to be partially spaced apart from each other along the width direction of the gasket body 100, and the width of the inlet portion 120 and / or the discharge groove 112 may be expanded so that they intersect each other at the end along the length direction of the gasket body 100 or at an area adjacent to the end.

[0061] According to this configuration of the present disclosure, the first coating liquid discharged from the first spacer 10 and the second coating liquid discharged from the second spacer 20 are discharged in a manner of contacting each other. Therefore, the accuracy of the coating process in which the first coating liquid and the second coating liquid should be coated side by side while contacting each other can be improved. In particular, the process in which the first coating liquid and the second coating liquid should be coated side by side while contacting each other requires accurate alignment according to the direction in which the coating liquids are discharged. However, when the alignment is not accurately achieved in this way, there are problems such as the first coating liquid and the second coating liquid being coated without contacting each other or one coating liquid invading the part in which the other liquid should be coated, and this configuration of the present disclosure can solve these problems.

[0062] Refer again Figure 3 and Figure 4 , the inlet portion 120 may have an expansion portion A in which the end portion along the length direction of the gasket body 100 faces the discharge groove 112 in width. The inlet portion 120 may have an expansion portion A extending to have a constant width along the length direction of the gasket body 100 and then expanding the width at the end portion. The expansion portion A may have various structures such as a structure in which the width is rapidly expanded in a multi-stage form or a structure in which the width is gradually expanded in a tapered manner. For example, Figure 4 As shown, when the end of the inlet portion 120 along the length direction of the gasket body 100 gradually widens in width along the length direction of the gasket body 100, the discharge width of the second coating liquid discharged from the second spacer gasket 20 will not expand rapidly toward the first coating liquid discharged from the first spacer gasket 10, but will expand gradually, thereby preventing the first coating liquid and the second coating liquid from mixing due to the rapid expansion of the discharge width of the first coating liquid.

[0063] Figure 5 is a front view showing a first spacer 10 according to the present disclosure.

[0064] Reference Figure 5 , the depth of the inlet portion 120 may be substantially the same as the depth of the discharge groove 112. The depth of the inlet portion 120 along the thickness direction of the gasket body 100 may be substantially the same as the depth of the discharge groove 112 along the thickness direction of the gasket body 100. In this case, a problem in which the first coating liquid discharged from the first spacing gasket 10 and the second coating liquid discharged from the second spacing gasket 20 are discharged at different heights, such that one coating liquid is coated below or above the other coating liquid, can be prevented.

[0065] Figure 6 is a portion of a side view showing a first spacer 10 according to the present disclosure.

[0066] Reference Figure 6 as well as Figure 2 and Figure 5 , the gasket body 100 may have a step portion 130 .

[0067] The step portion 130 may be positioned in the direction in which the first coating liquid is discharged. The step portion 130 may be formed by the region where the second surface forming the thickness of the gasket body 100 intersects with the first surface and the region adjacent to the region inwardly recessed along the length direction of the gasket body 100. The step portion 130 may be configured so that the portion located below along the thickness direction of the second surface (parallel to the direction of the Z axis) protrudes further outward along the length direction of the gasket body 100 than the portion located above. The step portion 130 may be formed on the entire second surface along the width direction of the gasket body 100. However, the step portion 130 may be provided only in the region corresponding to the region where the inlet portion 120 and the discharge groove 112 are located. That is, the step portion 130 may be provided only at one end and / or both ends of the gasket body 100.

[0068] According to such a configuration of the present disclosure, the first coating liquid discharged from the discharge groove 112 and the second coating liquid discharged from the inlet portion 120 can fall to the step portion 130 and be discharged in contact with each other. Compared with when the coating liquid is directly discharged from the discharge groove 112 and the inlet portion 120, the coating liquid falls downward along the thickness direction of the gasket body 100 by gravity and is discharged, so the possibility of the first coating liquid and the second coating liquid being discharged without contacting each other can be significantly reduced.

[0069] Refer again Figure 1 and Figure 2 , the first spacer 10 may include a fastening hole 140 for coupling with the slot die coater 1 which will be described later.

[0070] At least one fastening hole 140 may be provided to penetrate the gasket body 100 so as not to overlap with the flow path portion 110 .

[0071] When the first spacer 10 is installed in the slot die coating machine 1, the fastening hole 140 may be used. The inner circumferential surface of the fastening hole 140 may be provided with a thread for bolt fastening. At least one fastening hole 140 may be provided in the inner area of ​​the gasket body 100. At least two fastening holes 140 may be provided in the inner area of ​​the gasket body 100.

[0072] Figure 7 is a diagram showing a slot die coater 1 according to the present disclosure.

[0073] Reference Figure 7 The slot die coating machine 1 may include the first spacer 10 described above. In addition, the slot die coating machine 1 may include a second spacer 20, a first slot module 3 and a second slot module 5.

[0074] The second spacer 20 may be disposed on one side of the first spacer 10. The second spacer 20 may be disposed on both sides of the first spacer 10. The second spacer 20 may be disposed in an area where the first coating liquid discharged from the first spacer 10 and the second coating liquid discharged from the second spacer 20 need to be simultaneously coated. When the second spacer 20 is disposed on one side of the first spacer 10, the discharge groove 112 of the first spacer 10 located in a portion where the second spacer 20 is not disposed may be blocked so that the first coating liquid does not come out.

[0075] The first tank module 3 may be coupled to one side of the gasket body 100 to face the exposed surface of the flow path portion 110 .

[0076] The second trough module 5 may be coupled to the other side of the gasket body 100 to face the first trough module 3 .

[0077] The first tank module 3 may include a coating liquid supply unit 7 communicating with the inlet groove 111 of the first gasket. However, the coating liquid supply unit 7 may be installed outside.

[0078] The detailed structure of the coating liquid supply unit 7 is not shown, but for example, it may include a coating liquid introduction chamber recessed in the thickness direction of the first tank module 3 (the direction parallel to the Z axis), a coating liquid introduction hole connected to the coating liquid introduction chamber and perforated in the thickness direction of the first tank module 3 (the direction parallel to the Z axis), and a coating liquid supply pipe having one end connected to the coating liquid introduction hole and the other end connected to a pump.

[0079] The slot die coater 1 may use a plurality of pumps P1, P2 to supply the coating liquid. The number of pumps may correspond to the number of the first spacers 10 and the second spacers 20. Each pump may independently supply the coating liquid to each spacer through the coating liquid supply unit 7. However, the number of the plurality of pumps P1, P2 is not necessarily limited to the number of the first spacers 10 and the second spacers 20, and for example, the pump supplying the coating liquid to the second spacer may be a pump connected to the whole.

[0080] The manifold 9 is disposed in the first tank module 3 or the second tank module 5, and is configured to receive the coating liquid in the inner space. For example, the manifold 9 is disposed in the first tank module 3 located above and has a hollow semi-cylindrical structure in which a semicircular outer peripheral surface is located at the top, and a rectangular outer peripheral surface is located at the bottom to face the first spacer 10 and the second spacer 20. The manifold 9 is connected to the coating liquid supply unit 7 to receive the coating liquid. When the coating liquid is filled in the manifold 9, the coating liquid can flow along the first spacer 10 and the second spacer 20.

[0081] The first trough module 3 and the second trough module 5 may be coupled by at least one bolt fastening structure B.

[0082] The detailed structure of the bolt fastening structure B is not shown, but for example, it may include a bolt fastening hole formed in the first slot module 3 and having a thread formed on the inner circumferential surface, a bolt guide hole formed in the second slot module 5 and guiding the bolt to be inserted from the outside, and a bolt inserted through the bolt guide hole and connected to the bolt fastening hole.

[0083] The detailed structure of the bolt fastening structure B is not limited thereto. The bolt fastening hole may be formed in the second trough module 5, and the bolt guide hole may be formed in the first trough module 3. In addition, various bolt fastening structures B known in the art may be adopted.

[0084] The coating liquid discharged from the slot die coater 1 may be continuously discharged on the surface of the substrate D conveyed by the roller R.

[0085] Figure 8 is a diagram illustrating a first spacer 10 and a second spacer 20 included in a slot die coater 1 according to the present disclosure. Fig. 9 1 is a diagram showing coating of a substrate D by the slot die coater 1 according to the present disclosure.

[0086] Reference Figure 8 and Fig. 9 , the slot die coater 1 may include a plurality of first spacers 10 and a plurality of second spacers 20. The slot die coater 1 may include seven first spacers 10 and six second spacers 20. The first spacers 10 and the second spacers 20 may be arranged at regular intervals along the X-axis direction.

[0087] The slot die coater 1 can simultaneously form a first coating layer C1 corresponding to the number*2 of the first spacers 10 and a second coating layer C2 corresponding to the number*1 of the second spacers 20 on the surface of the substrate D advancing in the Y-axis direction along the advancing direction of the substrate. However, the outermost discharge grooves 112 of the first spacers 10 may be blocked.

[0088] According to this structure, at least a portion of the second coating liquid discharged from the second spacer 20 flows to the inlet portion 120 of the adjacent first spacer 10, so that the first coating liquid and the second coating liquid can be simultaneously coated while in contact with each other. When the second coating layer C2 at the center and the first coating layer C1 in contact with the second coating layer C2 on both sides are referred to as one coating group, six coating groups are coated, and twelve electrodes used in the production process of the electrode assembly can be cut roughly in the middle of the second coating layer C2 and the middle of the adjacent coating groups.

[0089] Hereinafter, a coating method using the slot die coater 1 will be described.

[0090] The coating method according to the present disclosure may include the following steps: 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 disclosure; and wherein a second coating liquid discharged from a second spacer 20 at predetermined intervals along the long side direction (direction parallel to the X axis) on one surface of the substrate D using the slot die coater 1 forms a plurality of second coating layers C2 and forms a strip-shaped uncoated portion extending along the long side direction (direction parallel to the X axis) between the second coating layers C2 adjacent along the short side direction (direction parallel to the Y axis), and at the same time, the first coating liquid discharged from the first spacer 10 forms a first coating layer C1 covering the boundary between each second coating layer C2 and the uncoated portion adjacent thereto with a predetermined width along the long side direction (direction parallel to the X axis). In the coating method, the substrate D may be a metal foil current collector, the first coating layer C1 may be an insulating coating, and the second coating layer C2 may be an active material coating.

[0091] As above, the present disclosure has been described mainly with preferred embodiments with reference to the accompanying drawings, but it is obvious to those skilled in the art that, without departing from the scope of the present disclosure, many and various obvious modifications are possible according to this description. Therefore, the scope of the present disclosure should be interpreted by the claims that are written as examples including such many modifications.

Claims

1. A first spacer, comprising: a gasket body having a plate shape with a predetermined width, length, and thickness and including a first surface having the width and the length, Wherein, the gasket body comprises: a flow path portion including an inlet groove formed as a groove recessed in the thickness direction on the first surface and configured to allow the first coating liquid to flow in along the thickness direction, and a discharge groove formed as 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 is formed as a groove recessed in the thickness direction at one end of the first surface in the width direction.

2. The first spacer according to claim 1, in, The inlet portion opens in the width direction and the length direction of the gasket body.

3. The first spacer according to claim 1, in, The flow path portion is formed on the inner side of the first surface, and The inlet portion is formed on the first surface further outward than the flow path portion in the width direction.

4. The first spacer according to claim 1, in, The inlet portion is formed further outward than the discharge groove in the width direction.

5. The first spacer according to claim 4, in, The inlet portion is at least partially spaced apart from the discharge channel.

6. The first spacer according to claim 5, in, The inlet portion contacts the discharge groove at an end portion along the length direction.

7. The first spacer according to claim 1, in, The depth of the inlet portion is substantially the same as the depth of the discharge groove.

8. The first spacer according to claim 1, in, The inlet portion and the discharge groove extend along the length direction, and The inlet portion has an expanded portion that expands in width in a direction facing the discharge groove at an end portion along the length direction.

9. The first spacer according to claim 8, in, In the inlet portion, an end portion along the length direction gradually widens in width along the length direction.

10. The first spacer according to claim 1, in, The gasket body has a step portion located in a direction in which the first coating liquid is discharged and formed by a region intersecting the first surface on a second surface forming the thickness and a region adjacent to the region being recessed inwardly along a length direction of the gasket body.

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

12. A slot die coater, comprising: A first spacer according to any one of claims 1 to 11; a second spacer, the second spacer being disposed on one side of the first spacer; a first tank module coupled to one side of the gasket body to face the exposed surface of the flow path portion; as well as A second slot module is coupled to the other side of the gasket body to face the first slot module.

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

14. The slot die coater according to claim 12, in, The gasket body has a step portion located in a direction in which the first coating liquid is discharged and formed by a region intersecting the first surface on a second surface forming the thickness and a region adjacent to the region being recessed inwardly along a length direction of the gasket body.

15. The slot die coater according to claim 14, in, The first coating liquid discharged from the first spacer and the second coating liquid discharged from the second spacer are discharged in contact with each other at the step portion.

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