Die coater for coating active material to current collector of secondary battery

Abstract

Disclosed is a die coater capable of effectively simultaneously coating two different liquids to a current collector of a secondary battery, including: an upper block provided with a second liquid inlet; a lower block combined to the upper block and provided with a manifold configured to accommodate a first liquid; and a coater shim interposed between the upper block and the lower block to form a first slit and a second slit separated from each other, wherein the coater shim includes: a first coater shim forming the first slit for discharging the first liquid accommodated in the manifold; and a second coater shim forming the second slit for discharging a second liquid supplied through the second liquid inlet, and the first coater shim and the second coater shim have the same height, are not overlapped up and down, and are placed on the same plane between the upper block and the lower block.

Description

Technical Field

[0001] This invention relates to a mold coating machine capable of effectively coating two different liquids simultaneously onto the current collector of a secondary battery.

[0002] This application claims priority based on Korean Patent Application No. 10-2022-0004219, dated January 11, 2022, the entire contents of which are incorporated herein by reference. Background Technology

[0003] With technological advancements and increasing demand for mobile devices, the demand for rechargeable batteries has also grown rapidly. Among rechargeable batteries, lithium-ion batteries are widely used as the energy source for various electronic products and mobile devices due to their high energy density, high operating voltage, and excellent storage and lifespan characteristics.

[0004] Lithium-ion secondary batteries employ electrodes in which an active material layer and an insulating layer are formed on the surface of a current collector. The electrodes are manufactured using a coating apparatus such as a die coater, by applying an electrode slurry containing the active material and an insulating coating liquid containing the insulating material to the surface of the current collector, overlapping a portion of the edge of the electrode mixture layer, and then drying.

[0005] Figure 1 A conventional die coating machine 1 for applying electrode paste is shown. The die coating machine 1 includes an upper block 2 and a lower block 3, with a gasket 4 inserted between the upper block 2 and the lower block 3. The upper block 2, the lower block 3, and the gasket 4 are fastened together by a plurality of bolt components. The lower block 3 is provided with a manifold 5 for receiving a predetermined volume of electrode paste, and the manifold 5 is connected to an external electrode paste supply unit (not shown).

[0006] Here, the gasket of the die coater is used to form a slit of appropriate height between the upper and lower blocks, and simultaneously to restrict the flow direction of the electrode paste so that the electrode paste is discharged toward the slit, and to seal between the upper and lower blocks to prevent the electrode paste from leaking into parts other than the slit. The gasket of the die coater is provided with guides protruding from both ends in the width direction, and the width of the electrode paste applied to the current collector depends on the distance between the guides.

[0007] An insulating coating is applied to the two edges of the electrode paste applied to the current collector along its width. Typically, the insulating coating is applied as an additional step using a separate device after the electrode paste has been applied to the current collector. However, applying both the electrode paste and the insulating coating to the current collector in a separate step is not ideal in terms of production efficiency.

[0008] To overcome the aforementioned limitations, a technique has been proposed to form separate slits in a die coater gasket for discharging electrode slurry and insulating coating liquid. However, if either of the two liquids leaks in the die coater, the two liquids (e.g., electrode slurry and insulating coating liquid) mix, or the two liquids mix and discharge from the slit outlet, thus causing quality defects in the current collector.

[0009] [Related Technical Documents]

[0010] (Patent Document 1) Korean Patent Application No. 10-2021-0083512 (published on July 7, 2021) Summary of the Invention

[0011] Technical issues

[0012] The present invention aims to provide a mold coating machine that can effectively coat the current collector of a secondary battery with two different liquids simultaneously.

[0013] However, the technical problems to be solved by the present invention are not limited to those described above, and those skilled in the art can clearly understand from the following description of the present invention other problems not mentioned.

[0014] Technical solution

[0015] One aspect of the present invention provides a mold coating machine capable of efficiently coating a current collector of a secondary battery with two different liquids simultaneously, comprising: an upper block having a second liquid inlet; a lower block, the lower block being coupled to the upper block and having a manifold configured to receive a first liquid; and a coating machine pad inserted between the upper block and the lower block to form a first slit and a second slit separated from each other, wherein the coating machine pad comprises: a first coating machine pad forming the first slit for discharging the first liquid contained in the manifold; and a second coating machine pad forming the second slit for discharging a second liquid supplied through the second liquid inlet, and the first coating machine pad and the second coating machine pad having the same height, not overlapping vertically, and placed on the same plane between the upper block and the lower block.

[0016] The width of the first slit can be limited to the width of the second coating machine pad.

[0017] The height of the first slit may correspond to the height of the first coating machine pad, and the height of the second slit may be configured to be less than the height of the second coating machine pad.

[0018] The second coating machine pad may be provided with a recessed flow channel, the flow channel being open toward the upper block and having a bottom surface, the closed end of the flow channel being connected to the second liquid inlet of the upper block, and the open end of the flow channel being formed into the second slit.

[0019] The first coating machine pad may include: a base extending in the width direction; and a first guide and a second guide extending from both ends of the base, wherein the paired two sidewalls of the second coating machine pad may be in close contact with the inner wall of the first guide and the inner wall of the second guide.

[0020] The distance between the other two sidewalls of the pair of the second coating machine pads may correspond to the width of the first slit.

[0021] A threaded through hole leading to the bottom surface of the second coating machine pad can be formed in the lower block, and the end of a screw threaded into the threaded through hole can press the second coating machine pad so that the second coating machine pad is in close contact with the upper block.

[0022] An enlarged pressing block hole may be formed at the end of the threaded through hole in the engagement direction, and the pressing block housed in the pressing block hole may be clamped between the screw and the second coating machine gasket to press the second coating machine gasket.

[0023] The pressing block can press on portions of the two side walls of the second coating machine pad.

[0024] The mold coating machine may further include a third coating machine pad, the third coating machine pad being provided with a recessed U-shaped flow channel and having a height equal to that of each of the first coating machine pad and the second coating machine pad, the U-shaped flow channel being open toward the upper block and having a bottom surface, wherein the closed end of the U-shaped flow channel is connected to the second liquid inlet of the upper block, and the two open ends of the U-shaped flow channel form a third slit, wherein the third coating machine pad may be disposed between the first guide and the second guide.

[0025] A threaded through hole leading to the bottom surface of the third coating machine pad can be formed in the lower block, and the end of the screw threaded into the threaded through hole can press the third coating machine pad so that the third coating machine pad is in close contact with the upper block.

[0026] An enlarged pressing block hole may be formed at the end of the threaded through hole in the engagement direction, and the pressing block housed in the pressing block hole may be clamped between the screw and the third coating machine gasket to press the third coating machine gasket.

[0027] The pressing block can press on portions of the two side walls of the third coating machine pad.

[0028] Beneficial effects

[0029] According to the mold coating machine of the present invention, the mold coating machine is configured to simultaneously discharge two liquids, such as electrode slurry and insulating coating liquid. In particular, the first slit and the second slit, which discharge the first liquid and the second liquid respectively, can be physically separated from each other in the mold coating machine.

[0030] Furthermore, since the second coating machine gasket that forms the second slit uses a separate pressing structure to maintain a seal, it is possible to reliably prevent the internal mixing of the first liquid and the second liquid.

[0031] Therefore, the mold coating machine according to the present invention can effectively coat the current collector with two different liquids simultaneously.

[0032] It should be noted that the effects of the present invention are not limited to those described above. Those skilled in the art can clearly understand other effects of the present invention not mentioned above from the following detailed description. Attached Figure Description

[0033] The following figures illustrate exemplary embodiments of the invention and are intended to aid in understanding the technical concept of the invention together with the detailed description of the invention to be described below. Therefore, the invention should not be construed as being limited to the details shown in the figures.

[0034] Figure 1 It is a diagram illustrating the structure of a mold coating machine based on relevant technologies.

[0035] Figure 2 This is an exploded perspective view illustrating a mold coating machine according to one embodiment of the present invention.

[0036] Figure 3 It is a plan view of the mold coating machine shown on the upper part.

[0037] Figure 4 It is a diagram Figure 3 A magnified front view of part "A".

[0038] Figure 5 This is an enlarged front view illustrating the pressing structure.

[0039] Figure 6 This is an exploded perspective view illustrating a mold coating machine according to another embodiment of the present invention.

[0040] Figure 7 It is a diagram Figure 6 A perspective view of the third coating machine pad included in the mold coating machine. Detailed Implementation

[0041] This invention can be modified in various forms and can have various implementation methods, therefore, specific implementation methods will be described in detail below.

[0042] However, the implementation methods are not intended to limit the invention to these specific embodiments, and should be interpreted as including all modifications, equivalents or substitutions that fall within the spirit and technical scope of the invention.

[0043] In this invention, the terms "comprising," "having," etc., are used to specify the presence of features, quantities, steps, operations, components, elements, or combinations thereof, without excluding the presence or addition of one or more other features, quantities, steps, operations, components, elements, or combinations thereof.

[0044] Furthermore, in this invention, when a portion of a layer, film, region, plate, etc., is described as being "on" another portion, this includes not only the case where the portion is "directly on" the other portion, but also the case where there is another portion between them. Conversely, when a portion of a layer, film, region, plate, etc., is described as being "below" another portion, this includes not only the case where the portion is "directly below" the other portion, but also the case where there is another portion between them. Furthermore, in this application, "deposited on" can include not only the case where it is disposed at the upper part, but also the case where it is disposed at the lower part.

[0045] This invention relates to a mold coating machine capable of effectively coating two different liquids simultaneously onto the current collector of a secondary battery.

[0046] In one example, the mold coating machine of the present invention includes: an upper block provided with a second liquid inlet; a lower block coupled to the upper block and provided with a manifold configured to receive a first liquid; and a coating machine gasket inserted between the upper block and the lower block to form a first slit and a second slit separated from each other.

[0047] Here, the mold coating machine of the present invention includes two types of coating machine pads: a first coating machine pad and a second coating machine pad. The first coating machine pad forms a first slit for discharging a first liquid contained in a manifold of the lower block, and the second coating machine pad forms a second slit for discharging a second liquid supplied through a second liquid inlet of the upper block. In particular, the first coating machine pad and the second coating machine pad have the same height and do not overlap vertically, thus placing the first coating machine pad and the second coating machine pad on the same plane between the upper and lower blocks.

[0048] According to the mold coating machine of the present invention, the mold coating machine is configured to simultaneously discharge two liquids, such as electrode slurry and insulating coating liquid. In particular, since the first slit and the second slit discharging the first liquid and the second liquid respectively are physically separated from each other in the mold coating machine, internal mixing of the first liquid and the second liquid can be prevented.

[0049] The mode of the present invention

[0050] In the following, some embodiments of the mold coating machine according to the present invention will be described in detail with reference to the accompanying drawings.

[0051] [First Implementation Method]

[0052] Figure 2 This is an exploded perspective view illustrating a mold coating machine 10 according to an embodiment of the present invention. (Refer to...) Figure 2 The construction of the mold coating machine 10 according to the present invention will be described below.

[0053] As described above, the present invention relates to a mold coating machine 10 capable of efficiently coating a current collector of a secondary battery with two different liquids simultaneously. The two different liquids may be, for example, an electrode slurry and an insulating coating liquid. The following description is to be understood as an embodiment in which the first liquid is an electrode slurry and the second liquid is an insulating coating liquid.

[0054] The mold coating machine 10 of the present invention includes an upper block 100, a lower block 200, and a coating machine pad 300 inserted between the upper block and the lower block. In particular, the coating machine pad 300 of the present invention includes a first coating machine pad 310 and a second coating machine pad 320.

[0055] The upper block 100 includes the second liquid inlet 120 and occupies approximately half of the main body of the mold coating machine 10. The lower block 200 occupies the remaining half that is joined to the upper block 100, and the lower block 200 is provided with a manifold 210 for receiving the first liquid. Here, the upper and lower blocks are defined based on the accompanying drawings and do not limit the actual installation direction of the mold coating machine 10.

[0056] For your reference. Figure 2 A first liquid inlet 110 communicating with the manifold 210 of the lower block 200 is shown to be formed in the upper block 100, but the first liquid inlet 110 may be formed in the lower block 200. On the other hand, a second liquid inlet 120 should be formed in the upper block 100. This is because the arrangement design is limited by the flow channel 322 formed in the second coating machine gasket 320 and its sealing structure, which will be described below.

[0057] A coating machine gasket 300 is inserted between the upper block 100 and the lower block 200. The coating machine gasket 300 is essentially inserted between the upper block 100 and the lower block 200 to form a slit with a height suitable for liquid discharge. Furthermore, the coating machine gasket 300 restricts the flow direction of liquid flowing into or contained in the die coating machine 10 towards the slit without backflow, and also serves to seal the liquid so as not to leak into any part other than the slit.

[0058] In this invention, the coating machine gasket 300 includes a first coating machine gasket 310 and a second coating machine gasket 320. The first coating machine gasket 310 and the second coating machine gasket 320 form separate first slits 318 and second slits 328. Specifically, the first coating machine gasket 310 forms the first slit 318, which discharges a first liquid contained in the manifold 210 of the lower block 200, and the second coating machine gasket 320 forms the second slit 328, which discharges a second liquid supplied through the second liquid inlet 120 of the upper block 100.

[0059] Furthermore, the first coating machine pad 310 and the second coating machine pad 320 have the same height and do not overlap. Therefore, the first coating machine pad 310 and the second coating machine pad 320 are placed on the same plane between the upper block 100 and the lower block 200.

[0060] Figure 3 It is a plan view of the mold coating machine 10 through the upper 100 diagram. Figure 4 It is a diagram Figure 3 A magnified front view of part "A". (Refer to...) Figure 3 and Figure 4 The first coating machine pad 310 includes: a base 312 extending in the width direction; and a first guide 314 and a second guide 316 extending protruding from both ends of the base 312. Furthermore, the second coating machine pad 320 is provided with a recessed flow channel 322, which opens toward the upper block 100 and has a bottom surface (see...). Figure 5 ).

[0061] Here, in the first coating machine pad 310, a first slit 318 is formed in the space between the first guide 314 and the second guide 316, and in the second coating machine pad 320, a second slit 328 is formed at the open end of the recessed flow channel 322 with a bottom surface. Since the depth of the flow channel 322 is less than the thickness (height) of the second coating machine pad 320, therefore... Figure 4 As shown, the height of the first slit 318 corresponds to the height of the first coating machine pad 310, and the height of the second slit 328 is formed to be less than the height of the second coating machine pad 320.

[0062] Furthermore, since the first coating machine pad 310 and the second coating machine pad 320 have the same height and are coplanar with each other without overlapping, the width of the first slit 318 is limited to the width of the second coating machine pad 320.

[0063] For example, in Figure 3In the first embodiment shown, the paired two sidewalls 324 of the second coating machine pad 320 are in close contact with the inner walls of the first guide 314 and the second guide 316. Therefore, the distance between the other two paired sidewalls 324 of the second coating machine pad 320 (the sidewalls opposite the sidewalls in close contact with each other) corresponds to the actual width of the first slit 318. That is, the width of the first slit 318 is the length obtained by subtracting the width of the second coating machine pad 320 from the distance between the inner walls of the first guide 314 and the second guide 316.

[0064] As described above, considering the structure of the second slit 328 formed by the second coating machine pad 320, since the first liquid in the first slit 318 is blocked by the two sidewalls 324 of the second coating machine pad 320, and the lower side of the flow channel 322 is the bottom surface while its upper side is in close contact with the upper block 100, the second coating machine pad 320 is structurally completely separated from the first liquid. Therefore, in the mold coating machine 10 according to the present invention, the possibility of mixing of two different liquids is significantly reduced.

[0065] Furthermore, according to the present invention, it can be achieved through Figure 5 The pressing structure shown maintains the improved sealing of the second coating machine gasket 320. Figure 5 The pressing structure is designed to enhance the seal between the upper block 100 and the second coating machine gasket 320. That is, since the two side surfaces and bottom surface of the second coating machine gasket 320 are structurally sealed to ensure a tight seal, and the seal of the upper surface is affected by the degree of adhesion to the upper block 100, the pressing structure is applied... Figure 5 The pressing structure allows the second coating machine pad 320 to make more secure and tighter contact with the upper block 100.

[0066] Reference Figure 5 The closed end of the recessed flow channel 322 formed in the second coating machine pad 320 is connected to the second liquid inlet 120 of the upper block 100 to receive the second liquid. For reference, as shown below. Figure 2 As shown, the number and location of the second liquid inlets 120 correspond to the number and location of the second coating machine pads 320.

[0067] Furthermore, in the illustrated embodiment, the mounting position of the second coating machine gasket 320 is precisely set by a pin member 130 provided in the upper block 100. The pin member 130 protrudes from near the second liquid inlet 120 and inserts into the mating hole 326 provided in the second coating machine gasket 320, thereby fixing the position of the second coating machine gasket 320.

[0068] Here, the pin member 130 and the mating hole 326 can be designed to consistently determine the fixed position and orientation of the second coating machine pad 320. Specifically, the installation orientation should be consistently determined to prevent rotation of the second coating machine pad 320 with the pin member 130 inserted. This can be achieved by providing a structure with multiple pin members 130, a structure forming the pin member 130 and the mating hole 326 in shapes other than a circular cross-section, or a design combining these structures. Furthermore, if needed, a recessed pin insertion hole 220 for accommodating a protruding pin member 130 can be provided in the lower block 200.

[0069] A threaded through hole 230 is formed in the lower block 200 leading to the bottom surface of the second coating machine pad 320. The end of the screw 232, which is threaded into the threaded through hole 230, presses the second coating machine pad 320, so that the upper surface of the second coating machine pad 320 is pressed more strongly against the upper block 100.

[0070] Furthermore, in order to more effectively press the second coating machine gasket 320 onto the upper block 100, an enlarged pressing block hole 240 is formed at the end of the threaded through hole 230 in the mating direction (the direction of screw tightening), and a pressing block 242 housed in the pressing block hole 240 is sandwiched between the screw 232 and the second coating machine gasket 320, thereby pressing the second coating machine gasket 320 more effectively. For example, the pressing block 242 presses portions of the two side walls 324 of the second coating machine gasket 320, thereby pressing the second coating machine gasket 320 more effectively.

[0071] Apart from the pressing structure separately prepared with the second coating machine pad 320, i.e., the pressing force generated by the mutual meshing of the upper block 100 and the lower block 200, the possibility of the second liquid flowing through the second coating machine pad 320 mixing with the first liquid surrounding the second liquid is extremely low due to the additional pressing force of the screw 232 pressing the second coating machine pad 320.

[0072] [Second Implementation]

[0073] The second embodiment of the present invention is an embodiment suitable for the following situation: a first liquid and a second liquid, such as electrode paste and insulating coating liquid, are applied in two or more rows on a current collector provided in roll form, and then a slitting process is performed.

[0074] That is, the second embodiment corresponds to an embodiment suitable for simultaneously coating the current collector with an active material, thereby having a "two- or more rows of insulating coating liquid-electrode paste-insulating coating liquid" structure.

[0075] Figure 6This is an exploded perspective view illustrating a mold coating machine 10 according to another embodiment of the present invention. The second embodiment includes the entire structure of the first embodiment and further includes a third coating machine pad 330. The third coating machine pad 330 is mounted at the center of the mold coating machine 10 in the width direction and discharges the second liquid in two streams through a U-shaped flow channel 332. That is, the third coating machine pad 330 is formed to discharge the second liquid in two streams corresponding to two second coating machine pads 320 disposed in close contact with the first guide 314 and the second guide 316.

[0076] Furthermore, a third coating machine pad 330 is disposed between the first guide 314 and the second guide 316 of the first coating machine pad 310. Like the second coating machine pad 320, which limits the actual width of the first slit 318, the third coating machine pad 330 also acts as a factor limiting the first slit 318. Therefore, the third coating machine pad 330, positioned at the center of the first slit 318, divides the first liquid into two liquids, discharging the first liquid in two parallel rows. The height of the third coating machine pad 330 corresponds to the height of the first coating machine pad 310 and the second coating machine pad 320.

[0077] Due to the arrangement of the third coating machine pad 330 and the two-row discharge structure of the second liquid, a coating structure of "second liquid-first liquid-second liquid" is formed on the current collector in two parallel rows along the length direction of the current collector, and two current collector rolls can be obtained by a slitting process that cuts the part between the two parallel rows.

[0078] Figure 7 This is a perspective view illustrating the third coating machine gasket 330, which has the same construction as the second coating machine gasket 320, except for the structure of the U-shaped flow channel 332. Specifically, the third coating machine gasket 330 is provided with a recessed U-shaped flow channel 332, which opens towards the upper block 100 and has a bottom surface. The closed end of the U-shaped flow channel 332 is connected to the second liquid inlet 120 of the upper block 100, and the two open ends of the U-shaped flow channel 332 form a third slit 338. Similarly, the pin member 130 is inserted into the mating hole 336, so that the position of the third coating machine gasket 330 is fixed and does not rotate.

[0079] Furthermore, the same pressing structure as the second coating machine gasket 320 can be applied to the third coating machine gasket 330, and the construction and operation of the third coating machine gasket 330 are the same as described above. That is, a threaded through hole 230 leading to the bottom surface of the third coating machine gasket 330 is formed in the lower block 200, and the end of the screw 232 threaded into the threaded through hole 230 presses the third coating machine gasket 330, so that the third coating machine gasket 330 is in close contact with the upper block 100.

[0080] Furthermore, an enlarged pressing block hole 240 is formed at the end of the threaded through hole 230 in the mating direction, and the pressing block 242 housed in the pressing block hole 240 is sandwiched between the screw 232 and the third coating machine gasket 330, so that the third coating machine gasket 330 can be pressed. For example, the pressing block 242 can press a portion of the sidewall 334 of the third coating machine gasket 330.

[0081] In this second embodiment, although it is described that the first liquid and the second liquid are applied simultaneously in two parallel rows on the current collector by adding a third coating machine pad 330, it will be apparent to those skilled in the art that two or more third coating machine pads 330 may be added, and thus the first liquid and the second liquid may be applied in three or more rows.

[0082] As described above, the present invention has been described in more detail with reference to the accompanying drawings and embodiments. Therefore, the constructions shown in the description or figures herein are merely one embodiment of the invention and do not represent all the technical spirit of the invention. Consequently, it should be understood that various equivalents and modifications are possible to replace these embodiments and constructions at the time of filing this application.

[0083] [Description of reference markers]

[0084] 10: Mold Coating Machine 100: Upper Block

[0085] 110: First liquid inlet; 120: Second liquid inlet

[0086] 130: Pin component 200: Lower block

[0087] 210: Manifold 220: Pin insertion hole

[0088] 230: Threaded through hole; 232: Screw

[0089] 240: Pressing block hole 240 242: Pressing block

[0090] 300: Coating machine gasket; 310: First coating machine gasket.

[0091] 312: Base; 314: First guide element

[0092] 316: Second guide element; 318: First slit

[0093] 320: Second coating machine gasket; 322: Flow path groove

[0094] 324: Sidewall; 326: Connecting hole

[0095] 328: Second slit; 330: Third coating machine gasket.

[0096] 332: U-shaped flow channel; 334: sidewall

[0097] 336: Connection hole; 338: Third slit.

[0098] Industrial applicability

[0099] The mold coating machine of the present invention can be used to effectively coat the current collector of a secondary battery with two different liquids simultaneously.

Claims

1. A mold coating machine, comprising: The upper block is equipped with a second liquid inlet; The lower block is attached to the upper block and is provided with a manifold configured to contain a first liquid; and A coating machine gasket, inserted between the upper block and the lower block, to form a first slit and a second slit that are separated from each other. The coating machine gasket includes: a first coating machine gasket forming a first slit for discharging a first liquid contained in the manifold; and a second coating machine gasket forming a second slit for discharging a second liquid supplied through the second liquid inlet. The first coating machine pad and the second coating machine pad have the same height, do not overlap vertically, and are placed on the same plane between the upper block and the lower block. The first coating machine pad and the second coating machine pad are physically separate components. The second coating machine pad is provided with a recessed flow channel, which is open towards the upper block and closed relative to the lower block.

2. The mold coating machine according to claim 1, wherein the width of the first slit is limited to the width of the second coating machine pad as much as possible.

3. The mold coating machine according to claim 2, wherein: The height of the first slit corresponds to the height of the first coating machine pad, and The height of the second slit is less than the height of the second coating machine pad.

4. The mold coating machine according to claim 3, wherein: The flow channel has a bottom surface. The closed end of the flow channel is connected to the second liquid inlet of the upper block, and The open end of the flow channel forms the second slit.

5. The mold coating machine according to claim 4, wherein: The first coating machine pad includes: a base extending in the width direction; and a first guide and a second guide extending from both ends of the base, respectively. The two paired sidewalls of the second coating machine pad are in close contact with the inner wall of the first guide and the inner wall of the second guide, respectively.

6. The mold coating machine according to claim 5, wherein the distance between the other two sidewalls of the pair of the second coating machine pads corresponds to the width of the first slit.

7. The mold coating machine according to claim 1, wherein: A threaded through hole leading to the bottom surface of the second coating machine pad is formed in the lower block, and The end of the screw threaded into the threaded through hole presses down on the second coating machine gasket, so that the second coating machine gasket is in close contact with the upper block.

8. The mold coating machine according to claim 7, wherein: An enlarged pressing block hole is formed at the end of the threaded through hole in the engagement direction, and The pressing block, housed in the pressing block hole, is clamped between the screw and the second coating machine gasket to press the second coating machine gasket.

9. The mold coating machine according to claim 8, wherein the pressing block presses portions of two side walls of the second coating machine pad.

10. The mold coating machine according to claim 5, further comprising a third coating machine pad, the third coating machine pad being provided with a recessed U-shaped flow channel and having a height equal to that of each of the first coating machine pad and the second coating machine pad, the U-shaped flow channel being open toward the upper block and having a bottom surface, wherein the closed end of the U-shaped flow channel is connected to the second liquid inlet of the upper block, and the two open ends of the U-shaped flow channel forming a third slit. The third coating machine pad is disposed between the first guide and the second guide.

11. The mold coating machine according to claim 10, wherein: A threaded through hole leading to the bottom surface of the third coating machine pad is formed in the lower block, and The end of the screw threaded into the threaded through hole presses against the third coating machine gasket, so that the third coating machine gasket is in close contact with the upper block.

12. The mold coating machine according to claim 11, wherein: An enlarged pressing block hole is formed at the end of the threaded through hole in the engagement direction, and The pressing block, housed in the pressing block hole, is clamped between the screw and the third coating machine gasket to press the third coating machine gasket.

13. The mold coating machine according to claim 12, wherein the pressing block presses portions of two side walls of the third coating machine pad.

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