Coating apparatus and method for manufacturing a coated film

Abstract

To provide a coating apparatus and a method for manufacturing a coated film that achieves a highly uniform distribution of the coating amount. [Solution] A coating apparatus for applying a coating liquid exhibiting pseudoplasticity to a substrate, comprising: piping for supplying the coating liquid; a slot die including a plurality of receiving ports for receiving the coating liquid supplied by the piping, the discharge port for discharging the coating liquid received by the receiving ports onto the substrate being a slot; the piping including, in this order from the upstream side, a first pipe; a first branch pipe connected to the first pipe and having at least two branches; a second pipe connected to the first branch pipe; and a plurality of third pipes connected to each of the plurality of receiving ports; and upstream of the connection portion of the first pipe that connects to the first branch pipe, a coating apparatus including a static mixer.

Description

Technical Field

[0001] The present disclosure relates to a coating apparatus and a method for manufacturing a coating film.

Background Art

[0002] Various devices have been developed to uniformly apply a coating liquid exhibiting pseudoplasticity to a substrate. [[ID=1十三]] For example, a method using a specific die when applying a paste containing phosphor powder is disclosed (Patent Document 1). Also, a method using a die having a specific internal piping in the die when applying a resin composition containing conductive particles is disclosed (Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to obtain a target coating film, it may be required to further highly control the uniformity of the thickness of the coating film on the substrate.

[0005] The present disclosure has been made in view of the above circumstances. The problem to be solved by one embodiment of the present disclosure is to provide a coating apparatus and a method for manufacturing a coating film that highly uniformize the coating amount distribution.

Means for Solving the Problems

[0008] According to one embodiment of the present disclosure, it is possible to provide a coating apparatus and a method for manufacturing a coated film that can highly uniformize the distribution of the coating amount. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is an explanatory diagram illustrating the coating apparatus. [Figure 2] Figure 2 is an explanatory diagram illustrating the inside of a static mixer. [Figure 3] Figure 3 is an explanatory diagram illustrating the position immediately preceding the first pipe. [Figure 4] Figure 4 is an explanatory diagram illustrating the third piping system, which includes a static mixer. [Figure 5] Figure 5 is an explanatory diagram illustrating the second piping system, which includes a static mixer. [Modes for carrying out the invention]

[0010] The embodiments of this disclosure are described in detail below. This disclosure is not limited to the embodiments described below. The embodiments described below may be modified as appropriate within the scope of the purposes of this disclosure.

[0011] When describing embodiments of the present disclosure with reference to the drawings, descriptions of overlapping components and reference numerals in the drawings may be omitted. Components denoted by the same reference numerals in the drawings mean the same components. The ratio of dimensions in the drawings does not necessarily represent the ratio of actual dimensions.

[0012] In the present disclosure, a numerical range indicated by using "~" indicates a range including the numerical values described before and after "~" as the lower limit value and the upper limit value, respectively. In the numerical ranges described stepwise in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in other stepwise descriptions. Also, in the numerical ranges described in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the value shown in the examples.

[0013] In the present disclosure, the amount of each component in the composition means the total amount of a plurality of substances present in the composition when there are a plurality of substances corresponding to each component in the composition, unless otherwise specified.

[0014] In the present disclosure, the term "step" includes not only an independent step but also cases where it cannot be clearly distinguished from other steps, as long as the intended purpose of the step is achieved.

[0015] In the present disclosure, "mass%" and "weight%" are synonymous, and "parts by mass" and "parts by weight" are synonymous.

[0016] In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment.

[0017] In the present disclosure, ordinal numbers (e.g., "first" and "second") are terms used to distinguish components and do not limit the number of components or the superiority or inferiority of the components.

[0018] In the present disclosure, "solid content" means components other than the solvent. In each drawing, to avoid complexity, only one of multiple or equivalent components and parts may be assigned a reference numeral.

[0019] The process leading to the embodiments of this disclosure will be explained. When using a slurry-type electrode material as the coating solution and applying it using a slot die equipped with multiple coating solution receiving ports, the coating amount distribution on the substrate could become uneven. As a result, the thickness of the coating film applied to the substrate could become uneven. The inventors focused on the piping connected to the slot die when applying a coating liquid having pseudoplastic properties, such as an electrode material. They then diligently investigated methods for highly controlling the uniformity of the coating amount and discovered that by using a static mixer in the piping at a specific location, the coating amount distribution can be highly uniform, leading to the completion of the embodiment of this disclosure.

[0020] Although the mechanism by which the above effect is achieved is not clear, when using a slot die equipped with multiple coating liquid inlets, it is thought that the pseudoplasticity of the electrode material causes uneven liquid flow rates in branched piping connected to the multiple coating liquid inlets, resulting in a viscosity distribution. Furthermore, it is thought that the viscosity distribution generated in the liquid supply piping connected to the slot die creates a viscosity distribution inside the slot die as well, resulting in uneven discharge rates from the slot die, i.e., the amount of coating applied. It is presumed that by placing a static mixer in the piping at a specific location, the viscosity distribution that had occurred in the flow up to that point was effectively eliminated, and this effect of eliminating viscosity distribution remained until the slot where the coating liquid was discharged, resulting in the above-mentioned effect.

[0021] <Coating device> A coating apparatus according to an embodiment of the present disclosure will be described with reference to Figures 1, 2, 3, 4, and 5. Directions X and Y are orthogonal to each other, directions X and Z are orthogonal to each other, and directions Y and Z are orthogonal to each other. Direction Y is parallel to the width direction of the slot die.

[0022] As shown in Figure 1, a coating apparatus in one embodiment of the present disclosure is a coating apparatus 10 for applying a coating liquid exhibiting pseudoplasticity to a substrate, comprising a pipe 11 for supplying the coating liquid and a slot die 12 for discharging the coating liquid onto the substrate. The slot die 12 includes a plurality of receiving ports 13 for receiving the coating liquid supplied by the pipe 12, and the discharge ports 14 for discharging the coating liquid received by the receiving ports 13 onto the substrate are slots 14. In Figure 1, the arrows indicate the direction in which the coating liquid flows.

[0023] The piping 11 is connected in the following order from the upstream side that supplies the coating liquid: first pipe 15, first branch pipe 16, second pipe 17, second branch pipe 18, third pipe 19, and inlet 13. Piping 11 includes a single first pipe 15 and a first branch pipe 16 in that order, starting from the upstream side where the coating liquid is supplied. The first pipe 15 includes a static mixer 20 at the position immediately before it connects to the first branch pipe 16 (upstream of the connection).

[0024] When supplying the coating liquid to each inlet 13 through piping, a branch pipe is placed upstream between the point where there is only one pipe supplying the coating liquid and the inlet 13 to branch off the flow path. The branch pipe is a pipe that has branches so that the number of outlets is greater than the number of inlets.

[0025] The piping 11 includes a single first pipe 15 and a first branch pipe 16 in that order, starting from the upstream side that supplies the coating liquid. In the coating apparatus 10, the single first pipe 15 includes a static mixer 20 at a position just before it connects to the first branch pipe 16. The coating apparatus according to the embodiment of this disclosure may include one first pipe 15 and a first branch pipe 16, and downstream from the first branch pipe 16, there may be no branch pipes, or the pipe may branch into one or more stages.

[0026] The slot die 12 includes multiple inlets 13. The multiple inlets 13 are connected to a manifold contained within the slot die 12. The coating liquid is stored in the manifold and then sent to the slot 14.

[0027] The slot die 12 may contain one slot 14 or perform stripe coating with multiple slots 14. It is preferable that the slot die 12 contains one slot 14 with a wider width, as this can significantly improve the uniformity of the coating amount distribution.

[0028] The static mixer 20 is preferably a power-free mixer and is used inline. The static mixer 20 includes a tube and elements arranged inside the tube, and several types are known depending on the shape of the elements inside the tube. The elements stir the fluid flowing inside the tube and, for example, have a shape of a rectangular or elliptical plate twisted 180°, and there are right elements and left elements depending on the direction of the twist. The static mixer 20 can be selected according to the type of coating liquid, and may also be called a static mixer. When the coating liquid is an electrode slurry, from the viewpoint of pressure loss and the effect of highly homogenizing the coating amount distribution, the static mixer 20 is preferably a divided-type static mixer in which elements that divide the flow path are arranged inside the tube, and the coating liquid flowing through the flow path is divided as it progresses.

[0029] As shown in Figure 2, the static mixer 20 includes a pipe 21 and multiple elements 22a and 22b that divide the flow path. The elements 22a and 22b are arranged in the direction of the flow path so as to alternately divide the flow path. One stage is defined as a combination of elements 22a and 22b. As shown in Figure 2, the static mixer 20 is an 8-stage divided mixer. In Figure 2, the arrows indicate the direction in which the coating liquid flows.

[0030] From the viewpoint of highly homogenizing the coating amount distribution, the position in which one of the first pipes 15 includes the static mixer 20 is preferably just before it connects to the first branch pipe 16. "Just before" means that, when the inner diameter of the flow path of the first pipe 15 is d (mm), it is preferably within a distance of up to 4000 / d (mm) upstream from the connection point between the first pipe 15 and the first branch pipe 16, and more preferably within a distance of up to 400 / d (mm) upstream from the connection point between the first pipe 15 and the first branch pipe 16. The preferred position of the static mixer satisfies the above relationship.

[0031] As shown in Figure 3, when the diameter of the first branch pipe 16 is 20 mm, it is preferable to include the static mixer 20 at a position just before the first pipe 15 connects to the first branch pipe 16, and more specifically, to include the static mixer 20 within a 200 mm area L of the first pipe 15 upstream from the connection point 23 where the first pipe 15 connects to the first branch pipe 16.

[0032] The coating liquid applied to the coating device 10 is not limited as long as it is a pseudoplastic coating liquid or a non-Newtonian fluid. When a uniform coating amount distribution is required, the coating device 10 can be used to make the coating amount distribution discharged from the slot die 12 uniform. The coating amount distribution refers to the coating amount distribution in the width direction of the slot die 12. Examples of coating liquids include various coating agents, inks, electrode slurries, etc.

[0033] From the viewpoint of demonstrating a significant effect in highly homogenizing the coating amount distribution, it is preferable to use a coating liquid that has thixotropy in addition to pseudoplasticity. Even with such a coating liquid, if uniformity of the coating amount distribution is required, the coating device 10 can be used to homogenize the coating amount distribution discharged from the slot die 12. This is because the viscosity distribution tends to become complex as it flows through the piping 11. Examples of coating liquids that have thixotropy in addition to pseudoplasticity include epoxy-based and urethane-based adhesives, sealants such as silicone sealants, printing inks such as screen printing inks, paints used for painting, coating agents, cosmetics such as creams and gels, slurries for battery electrodes, food coatings such as chocolate, and pharmaceuticals such as gels and ointments. From the viewpoint of demonstrating a more significant effect in highly homogenizing the coating amount distribution, it is preferable that the coating liquid be an electrode slurry. The electrode slurry may be for the positive electrode or the negative electrode, and the type of battery is not limited. Any electrode material that forms an electrode film by coating and has pseudoplasticity can be used.

[0034] One embodiment of the coating apparatus described herein includes a static mixer 20 located just before a first pipe 15 connects to a first branch pipe 16, and since it includes the above configuration, it is possible to achieve a highly uniform coating amount distribution.

[0035] Furthermore, the piping 11 is provided with a plurality of third pipes 19 connected to each of the plurality of inlets 13, and it is preferable that each third pipe 19 includes a static mixer 20 at a position immediately before connecting to the inlet 13. By including a static mixer 20 in the first piping 15, and further including a static mixer 20 in the third pipes 19 connected to the inlets 13, the coating amount distribution can be made more stable and highly uniform.

[0036] As shown in Figure 4, the third pipe 19 can be provided in multiple locations, depending on the number of receiving ports 13 of the slot die 12. In the example shown in Figure 4, there are four receiving ports 13, so four third pipes 19 are provided. The third pipe 19 can be two or more, and any number can be provided depending on the number of receiving ports 13 of the slot die 12.

[0037] The position immediately before connecting to the inlet 13 is the same as in the case of the first pipe 15. That is, the position in which the third pipe 19 includes the static mixer 20 is the position immediately before connecting to the inlet 13, and "immediately before" is preferably within the region calculated by 4000 / d(mm) at the downstream end of the third pipe 19, and more preferably within the region calculated by 400 / d(mm), where d(mm) is the inner diameter of the flow path of the third pipe 19.

[0038] The same applies to the third pipe 19 as to the first pipe 15. When the diameter of the third pipe 19 is 12 mm, it is preferable to include the static mixer 20 at a position just before the third pipe 19 connects to the inlet 13, and it is preferable to include the static mixer 20 within a 333 mm region L of the third pipe 19 upstream from the connection point where the third pipe 19 connects to the inlet 13.

[0039] Furthermore, the piping 11 includes, in this order from the upstream side, at least two second pipes 17 connected to each of the first branch pipes 16, and two second branch pipes 18 connected to each of the two second pipes 17, each having at least two branches. Preferably, each second pipe 17 includes a static mixer 20 at a position immediately before connecting to the second branch pipe 18. By including a static mixer 20 in the first pipe 15, and further including a static mixer 20 in the second pipes 17, the coating amount distribution can be made more stable and highly uniform. Alternatively, the first pipe 15, the second pipes 17, and the third pipe 19 may all include a static mixer 20.

[0040] As shown in Figure 5, multiple second pipes 17 are provided depending on the number of branches immediately preceding the second pipe 17. In the example shown in Figure 5, since the first branch pipe 16 branches into two flow paths, two second pipes 17 are provided. There are two or more second pipes 17, and any number can be provided depending on the number of branches immediately preceding the second pipe 17.

[0041] The position in which the second pipe 17 includes the static mixer 20 is the same as in the case of the first pipe 15. That is, the position in which the second pipe 17 includes the static mixer 20 is the position immediately before it connects to the second branch pipe 18. "Immediately before" means that, if the inner diameter of the flow path of the second pipe 17 is d (mm), it is preferably within a distance of up to 4000 / d (mm) upstream from the connection point between the second pipe 17 and the second branch pipe 18, and more preferably within a distance of up to 400 / d (mm) upstream from the connection point between the second pipe 17 and the second branch pipe 18.

[0042] The same applies to the second pipe 17 as to the first pipe 15. When the diameter of the second pipe 17 is 12 mm, it is preferable that the static mixer 20 be located just before the second pipe 17 connects to the second branch pipe 18. It is also preferable that the static mixer 20 be located within a 333 mm region L of the second branch pipe 18 upstream from the connection point where the second pipe 17 connects to the second branch pipe 18.

[0043] <Method for manufacturing a coated film> One embodiment of the present disclosure is a method for manufacturing a coated film, which involves forming a coated film containing a coating liquid exhibiting pseudoplasticity on a substrate. The method comprises a step of supplying the coating liquid by piping to each of a plurality of receiving ports included in a slot die whose discharge port is a slot (hereinafter also referred to as the supplying step), and a step of discharging the coating liquid supplied to the plurality of receiving ports from the slot onto the substrate (hereinafter also referred to as the discharging step). The piping includes, from the upstream side, a single first pipe and a first branch pipe connected to the first pipe and having at least two branches, in this order, and the first pipe includes a static mixer at a position immediately before connecting to the first branch pipe.

[0044] A method for manufacturing a coated film, which is one embodiment of the present disclosure, preferably uses the above-described coating apparatus, which is one embodiment of the present disclosure, and is the same as described in the above-described coating apparatus. The liquid delivery process is preferably carried out by the piping 11, and the discharge process is preferably carried out by the slot die 12 (see Figure 1).

[0045] In one embodiment of the present disclosure, the method for manufacturing a coated film is preferable in which the coating liquid is an electrode slurry and the coated film is an electrode film, from the viewpoint of having a more pronounced effect in highly homogenizing the coating amount distribution. Electrode slurries often have thixotropy in addition to pseudoplasticity, and often to a high degree. Furthermore, by highly homogenizing the coating amount distribution of the electrode slurry, the film thickness distribution of the coated film becomes uniform in the width direction of the slot die 12, which contributes to improved battery performance and reduced costs. [Examples]

[0046] The above embodiments will be described in detail below with reference to examples, but the above embodiments are not limited to these examples.

[0047] (Coating solution A: Preparation of slurry for the negative electrode) A coating solution A, a negative electrode slurry with a solid content of 60% by mass, was obtained by mixing graphite (C) as the negative electrode active material, styrene-butadiene rubber (SBR) as the binder, carboxymethylcellulose (CMC) polyvinylpyrrolidone (PVP) as the viscosity modifier, and graphite (GF) and carbon black (CB) as the conductive additives in a mass ratio of C:SBR:CMC:PVP:GF:CB = 94:2:1:1:1:1 and kneading it with ion-exchanged water.

[0048] (Coating solution B: Preparation of slurry for the positive electrode) LiNi as a positive electrode active material 0.8 Co 0.1 Mn 0.1A mixture was obtained by mixing O2 (94% by mass), carbon black (2% by mass) as a conductive additive, and polyvinylidene fluoride (PVdF) (4% by mass) as a binder. The obtained mixture was dispersed in N-methylpyrrolidone solvent to obtain coating solution B, which is a slurry for the positive electrode.

[0049] (base material) The substrate used was either copper foil with a thickness of 10 μm or aluminum foil with a thickness of 12 μm.

[0050] <Example 1> The coating apparatus 10 shown in Figure 1 was used. Specifically, the first piping used a coating apparatus that included a static mixer. The static mixer was a split-type mixer as shown in Figure 2. The number of elements was 12. The static mixer was positioned 50 mm upstream of the connection point of the first piping to the first branch piping. The inner diameter of the flow path of the first piping was 16.1 mm. The relationship between the position of the static mixer and the diameter d of the first piping is shown in Table 1. A copper foil with a thickness of 10 μm was used as the substrate, and coating liquid A was applied to the substrate. A slot die 12 with one slot was used. The width of the slot, i.e., the width of the coating film, was 1000 mm. Details of the implementation are described in Table 1.

[0051] <Example 2> The coating apparatus 10 shown in Figure 1 was used. Specifically, the first piping used a coating apparatus that included a static mixer. The static mixer was a split-type mixer as shown in Figure 2. The number of elements was 12. The static mixer was positioned 50 mm upstream of the connection point of the first piping to the first branch piping. The inner diameter of the flow path of the first piping was 16.1 mm. The relationship between the position of the static mixer and the diameter d of the first piping is shown in Table 1. Aluminum foil with a thickness of 12 μm was used as the substrate, and coating liquid B was applied to the substrate. A slot die with four slots was used for stripe coating. The width of each slot, i.e., the coating width of one stripe, was 250 mm. Details of the implementation are described in Table 1.

[0052] <Example 3> The coating apparatus 10 shown in Figure 1 was used. Specifically, the first piping used a coating apparatus that included a static mixer. The static mixer was a split-type mixer as shown in Figure 2. The number of elements was 12. The static mixer was positioned 50 mm upstream of the connection point of the first piping to the first branch piping. The inner diameter of the flow path of the first piping was 16.1 mm. The relationship between the position of the static mixer and the diameter d of the first piping is shown in Table 1. Aluminum foil with a thickness of 12 μm was used as the substrate, and coating liquid A was applied to the substrate. A slot die with four slots was used for stripe coating. The width of each slot, i.e., the coating width of one stripe, was 250 mm. Details of the implementation are described in Table 1.

[0053] <Example 4> The static mixer was positioned 20 mm upstream of the connection point of the first branch pipe to the first piping, except that it was the same as in Example 3. Details of the implementation are shown in Table 1.

[0054] <Example 5> The coating apparatus 10 shown in Figure 1 was used. Specifically, the first piping was a coating apparatus that included a static mixer. The static mixer, which had the shape shown in Table 1, was positioned 50 mm upstream of the connection point of the first piping to the first branch piping. The inner diameter of the flow path of the first piping was 16.1 mm. The relationship between the position of the static mixer and the diameter d of the first piping is shown in Table 1. Aluminum foil with a thickness of 12 μm was used as the substrate, and coating liquid A was applied to the substrate. A slot die 12 with one slot was used. The width of the slot, i.e., the width of the coating film, was 1000 mm. The static mixer was a split-type mixer as shown in Figure 2. The number of elements was 8 stages. Details of the implementation are described in Table 1.

[0055] <Example 6> The coating apparatus 10 shown in Figure 1 was used. Specifically, the first piping was a coating apparatus that included a static mixer. The static mixer was a split-type mixer as shown in Figure 2. The number of elements was 12. The static mixer was positioned 50 mm upstream of the connection point of the first piping to the first branch piping. The inner diameter of the flow path of the first piping was 12.0 mm. The relationship between the position of the static mixer and the diameter d of the first piping is shown in Table 1. Aluminum foil with a thickness of 12 μm was used as the substrate, and coating liquid A was applied to the substrate. A slot die 12 with one slot was used. The width of the slot, i.e., the width of the coating film, was 1000 mm. Details of the implementation are described in Table 1.

[0056] <Example 7> The coating apparatus 10 shown in Figure 4 was used. Specifically, a coating apparatus including a static mixer was used for both the first and third pipes. The static mixer was a split-type mixer as shown in Figure 2. The number of elements was 12. The static mixer was positioned 50 mm upstream of the connection point to the first branch pipe in the first pipe, and 50 mm upstream of the connection point to the inlet in the third pipe. The inner diameter of the flow paths of both the first and third pipes was 16.1 mm. The relationship between the placement position of the static mixer and the diameter d of the first pipe or the diameter d of the third pipe was the same for both, and is shown in Table 1. Aluminum foil with a thickness of 12 μm was used as the substrate, and coating liquid A was applied to the substrate. A slot die 12 with one slot was used. The width of the slot, i.e., the width of the coating film, was 1000 mm. Details of the implementation are described in Table 1.

[0057] <Comparative Example 1> A coating apparatus similar to the coating apparatus 10 shown in Figure 1 was used, except that the first piping did not include a static mixer. The inner diameter of the first piping was 16.1 mm. Aluminum foil with a thickness of 12 μm was used as the substrate, and coating liquid A was applied to the substrate. A slot die 12 with one slot was used. The width of the slot, i.e., the width of the coating film, was 1000 mm. Details of the implementation are shown in Table 1.

[0058] <Comparative Example 2> Except for the first piping which did not include a static mixer, a coating apparatus similar to the coating apparatus 10 shown in Figure 4 was used. A split-type static mixer as shown in Figure 2 was used. The number of elements was 12. The static mixer was positioned 50 mm upstream from the connection point to the inlet of the third piping. In other words, a coating apparatus including a static mixer was used only in the second piping. The inner diameter of the flow path of the second piping was 16.1 mm. The relationship between the placement position of the static mixer and the diameter d of the third piping is shown in Table 1. Aluminum foil with a thickness of 12 μm was used as the substrate, and coating liquid A was applied to the substrate. A slot die 12 with one slot was used. The width of the slot, i.e., the width of the coating film, was 1000 mm. Details of the implementation are described in Table 1.

[0059] <Evaluation Method> The coating amount distribution was evaluated as follows by measuring the thickness of the coating film in the width direction. The thickness of the coating film obtained in the examples and comparative examples in the width direction was measured using a film thickness measuring instrument (SI-T80, Keyence Corporation), and the following evaluation was performed based on the obtained measurement values. The measurement points were determined by dividing the coated film into 10 equal widths and measuring the center of each width. In other words, there were 10 measurement points per coated film. The thickness variation rate for each coating film was determined from the obtained measurements. The thickness variation rate was calculated using the following formula 1, selecting the value that differs more from the average value XAve from the maximum value XMax and minimum value XMin obtained from the measurements.

[0060] Formula 1: Thickness variation rate (%) = |Maximum value XMax or Minimum value XMin - Average value XAve| ÷ Average value XAve × 100

[0061] Here, in Equation 1, the maximum value XMax is the maximum value among the 10 measured values, the minimum value XMin is the minimum value among the 10 measured values, and the average value XAve is the arithmetic mean of the 10 measured values. Of the thickness variation rates obtained by the method described above, the one showing the largest value was adopted, and the coating amount distribution was evaluated according to the following criteria. The evaluation results are shown in Table 1.

[0062] -standard- A: The thickness variation rate is 4% or less. B: The thickness variation rate is greater than 4% and less than or equal to 8%. C: The thickness variation rate is greater than 8%.

[0063] [Table 1] [Explanation of Symbols]

[0064] 10 Coating device 11 Piping 12-slot die 13 Inlet 14 slots 15. First Piping 16. First branch pipe 17. Second Piping 18. Second branch pipe 19. Third Piping 20 static mixer 21 tube 22a, 22b elements L area Y, Z direction

Claims

1. A coating apparatus for applying a coating solution exhibiting pseudoplasticity to a substrate, The piping for supplying the coating liquid, A slot die includes a plurality of receiving ports for receiving the coating liquid delivered by the piping, and the discharge ports for discharging the coating liquid received by the receiving ports onto the substrate are slots, Equipped with, The piping includes, in this order from the upstream side, a first pipe, a first branch pipe connected to the first pipe and having at least two branches, a second pipe connected to the first branch pipe, and a plurality of third pipes connected to each of the plurality of inlets. The first piping includes a static mixer upstream of the connection point to the first branch piping. Coating device.

2. The coating apparatus according to claim 1, wherein the third piping includes a static mixer upstream of the connection portion that connects to the inlet.

3. The piping includes, in this order from the upstream side, at least two second pipes connected to each of the first branch pipes, and two second branch pipes connected to each of the two second pipes and having at least two branches, The coating apparatus according to claim 1, wherein each of the aforementioned second pipes includes a static mixer upstream of the connection point to the second branch pipe.

4. The coating apparatus according to claim 1, wherein the static mixer is a split-type static mixer.

5. The coating apparatus according to claim 1, wherein the slot die has one slot.

6. The coating apparatus according to claim 1, wherein the coating liquid is a slurry for electrodes.

7. A method for manufacturing a coating film, which forms a coating film containing a coating liquid exhibiting pseudoplasticity on a substrate, The process involves supplying the aforementioned coating liquid via piping to each of the multiple receiving ports included in a slot die, the slot die having a discharge port that is a slot. A step of discharging the coating liquid, which has been supplied to the multiple receiving ports, from the slot onto the substrate, Equipped with, The piping includes, in this order from the upstream side, a first pipe, a first branch pipe connected to the first pipe and having at least two branches, a second pipe connected to the first branch pipe, and a plurality of third pipes connected to each of the plurality of inlets. The first piping includes a static mixer upstream of the connection point to the first branch piping. A method for manufacturing a coated film.

8. The aforementioned coating liquid is a slurry for electrodes, The method for manufacturing a coated film according to claim 7, wherein the coated film is an electrode film.

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