Nozzle

Abstract

The present invention addresses the problem of making it possible to precisely yet rapidly form, on a substrate, a coating film of a coating liquid, even in the case of the application of a resin composition containing electroconductive particles that tend to precipitate. The present invention proposes a mouth part comprising at least: a coating liquid introduction port through which a coating liquid is introduced; a coating liquid discharge port through which the coating liquid is discharged; and a mouth part inner piping that connects the coating liquid introduction port to the coating liquid discharge port. The mouth part is characterized in that, when the distance from a horizontal plane that includes the center of the coating liquid discharge port to the center of the coating liquid introduction port is T1, and the distance from the plane to a position inside the mouth part inner piping that is farthest from the plane (the position is referred to as "position A") is T2, the relationship between T1 and T2 is T2 > T1.

Description

Technical Field

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[0001] The present invention relates to a nozzle that can be suitably used for applying a coating liquid to the surface of a substrate.

Background Art

[0002] As an apparatus for applying a coating liquid to a substrate such as a glass substrate or a film, a nozzle having a slit for discharging the coating liquid is known (see, for example, Patent Document 1). The slit of this nozzle is formed long along the width direction of the substrate. For example, by discharging the coating liquid from the slit while horizontally moving the nozzle with respect to the substrate placed on the stage, a thin film (coating film) of the coating liquid can be formed on the surface of the substrate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0006] The above explanation used the application of a coating solution containing conductive particles, which is often operated intermittently, as an example. However, these problems are not limited to conductive particles; they are common problems that can also be observed when applying a coating solution containing non-conductive inorganic or organic particles to a substrate. [Means for solving the problem]

[0007] In other words, the present invention is a nozzle comprising at least a coating liquid inlet into which a coating liquid is introduced, a coating liquid outlet from which the coating liquid is discharged, and internal piping connecting the coating liquid inlet and the coating liquid outlet, characterized in that the relationship between the distance T1 from a horizontal plane including the center of the coating liquid outlet to the center of the coating liquid inlet and the distance T2 between the horizontal plane and the position in the internal piping of the manifold that is furthest from the horizontal plane (this position is referred to as "position A") is T2 > T1.

[0008] The present invention may also be a nozzle characterized in that, in the piping inside the nozzle, there is a portion between the center of the coating liquid inlet and position A, where the inclination angle from the center of the coating liquid inlet toward position A is +5 to +90 degrees with respect to a horizontal plane including the center of the coating liquid inlet.

[0009] Furthermore, in the present invention, the coating liquid discharge port is a slit-shaped discharge port with an aspect ratio of 2 or more, and the nozzle piping may be a nozzle that includes position A upstream and has a space that is widened to the width of the slit-shaped discharge port between it and the coating liquid discharge port.

[0010] Furthermore, the present invention may also involve a nozzle in which, in the piping inside the nozzle, a space is provided between the center of the coating liquid inlet and position A such that the flow velocity of the coating liquid is 1 / 20 or more and less than 1 / 1 of the flow velocity of the coating liquid when passing through the coating liquid inlet.

[0011] Furthermore, the present invention may also be a nozzle equipped with a static mixer in the piping inside the nozzle.

[0012] Furthermore, the present invention may also be a nozzle for applying a photosensitive resin composition containing conductive particles, a photopolymerization initiator, an ultraviolet-curable resin, and a solvent as the coating liquid. [Effects of the Invention]

[0013] The nozzle of the present invention has the effect of reducing the amount of conductive particles that settle in the piping before the liquid reaches the outlet, due to their own weight, and reducing the amount of conductive particles that reach the liquid outlet, because the relationship between the distance T1 from the horizontal plane containing the center of the liquid discharge port to the center of the liquid inlet and the distance T2 between the horizontal plane and the position in the piping inside the nozzle that is furthest from the horizontal plane is T2 > T1.

[0014] As a result, the discharge of the coating liquid from the coating liquid nozzle becomes smoother, allowing for the precise and high-speed formation of the coating film on the substrate. This effect is even more pronounced when the coating liquid nozzle has a slit shape. Furthermore, the presence of settled conductive particles in the coating film is reduced, and the thickness of the coating film becomes more uniform, resulting in more stable conductive performance. Consequently, it becomes possible to form a precise and uniform coating film on the substrate with high productivity through high-speed coating.

[0015] Furthermore, the nozzle of the present invention preferably has a space in the piping inside the nozzle between the center of the coating liquid inlet and position A where the flow velocity of the coating liquid is 1 / 20 or more and less than 1 / 1 of the flow velocity of the coating liquid when passing through the coating liquid inlet. As a result, the settled conductive particles and other coating liquid components are easily separated. Consequently, the effect of further reducing the amount of conductive particles settled at the bottom of the piping flowing into the manifold is further enhanced.

[0016] Furthermore, the nozzle of the present invention preferably includes a static mixer in the piping inside the nozzle, which has the effect of reducing the re-settlement of conductive particles by stirring the coating liquid with the static mixer. As a result, it is possible to maintain a high content of conductive particles in the coating film, which has the effect of improving the conductive performance of the coating film. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic cross-sectional view showing an example of an embodiment of the mouthpiece of the present invention. [Figure 2] This is a schematic cross-sectional view showing another example of the implementation of the nozzle of the present invention. [Figure 3] Figure 2 is a schematic perspective view illustrating the flow of the coating liquid within the large space formed inside the nozzle piping. [Figure 4] Figure 2 is a schematic perspective view showing an example in which a static mixer is installed in the upper part of the large space formed within the fitting piping section. [Figure 5] This is a schematic cross-sectional view showing an example in which a static mixer is installed at the location of the nozzle piping and the coating liquid inlet. [Figure 6] This is a schematic cross-sectional view showing another example in which a static mixer is installed at the location of the nozzle piping and the coating liquid inlet. [Figure 7] This is a schematic cross-sectional view showing an example in which an air vent mechanism is provided at the top of the liquid reservoir and a static mixer is provided inside the nozzle piping and the coating liquid supply piping. [Modes for carrying out the invention]

[0018] One aspect of the present invention is a nozzle comprising at least a coating liquid inlet through which a coating liquid is introduced, a coating liquid outlet through which the coating liquid is discharged, and an internal nozzle pipe that connects the coating liquid inlet and the coating liquid outlet, wherein a distance T1 from the center of the coating liquid inlet to the center of the coating liquid outlet in a horizontal plane including the center of the coating liquid outlet, and a distance T2 between the horizontal plane and the position in the internal nozzle pipe that is farthest from the horizontal plane satisfy T2 > T1.

[0019] Here, for convenience of explanation, "the position in the internal nozzle pipe that is farthest from the horizontal plane among the horizontal plane and the positions in the internal nozzle pipe" may be referred to as "Position A". This Position A means the position of the center part of the cross-section with the smallest cross-sectional area, that is, the center of the figure with the smallest area among the figures formed by the inner edge of the internal nozzle pipe in a cross-section including a certain point of the internal nozzle pipe, which is the farthest from the horizontal plane. Note that the cross-section is required to have no coating liquid that does not pass through the cross-section. Also, when there are multiple such locations, the position that is the most downstream as viewed from the coating liquid inlet is taken as Position A.

[0020] Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of the nozzle of the present invention. This nozzle 1 has a coating liquid inlet 6 through which a coating liquid is introduced, and a space (portions 4a, 4b, 4c, and 4d) that is widened to the width of the slit-shaped coating liquid outlet 4e between the coating liquid inlet 6 and the coating liquid outlet 4e including Position A on its upstream side. In this example, a liquid accumulation portion (liquid accumulation portion 4b) is provided at the upper part of the space, and a coating liquid passage 4d having a depth similar to that of the slit-shaped coating liquid outlet 4e is formed between the outlet 4c of the liquid accumulation portion and the coating liquid outlet 4e (for convenience, the configuration shown from 4a to 4e may be collectively referred to as the "manifold portion" (manifold portion 4)). Also, in this example, the internal nozzle pipe has a portion (portion 2 of the internal nozzle pipe) with an inclination angle θ from the center of the coating liquid inlet 6 toward Position A between the center of the coating liquid inlet 6 and Position A. Further, FIG. 1 shows a coating liquid supply pipe 3 for supplying a coating liquid to the nozzle of the present invention.

[0021] In this example, position A is located at the reservoir inlet 4a. The relationship between the distance T1 from the horizontal plane containing the center of the coating liquid discharge port 4e to the center of the coating liquid inlet 6 and the distance T2 between the horizontal plane and position A is T2 > T1. Furthermore, there is a portion between the center of the coating liquid inlet 6 and position A where the angle of inclination θ is relative to the horizontal plane containing the center of the coating liquid inlet 6, extending from the center of the coating liquid inlet 6 toward position A. Here, the angle of inclination θ is preferably between +5 and +90 degrees. This is because if it is less than +5 degrees, the possibility of particles settled at the bottom of the pipe reaching the liquid reservoir 4b increases. The larger the angle of inclination θ, the better, and as shown in the examples in Figures 5 and 6, the most preferable is +90 degrees. Note that the direction of the angle of inclination is defined as "+" when directed towards the vertically upward side relative to the horizontal plane containing the center of the coating liquid inlet 6.

[0022] On the other hand, considering processability, the upper limit of the inclination angle θ is preferably 85 degrees or less, and more preferably 75 degrees or less, as this allows for efficient processing. On the other hand, in cases where the specific gravity of the particles is light, there is a possibility that particles that have settled at the bottom of the pipe may be stirred up by the liquid flow and reach the liquid reservoir 4b, so the lower limit of the inclination angle θ is preferably 25 degrees or more, and more preferably 35 degrees or more to further suppress the effect of particles being stirred up by the liquid flow. Furthermore, since the portion 2 of the piping inside the nozzle can be shortened, making the overall size of the nozzle 1 more compact, the lower limit of the inclination angle θ is more preferably 65 degrees or more.

[0023] Here, the center of the coating liquid discharge port 4e is determined as the centroid of the figure formed by the edges of the discharge port.

[0024] Furthermore, in the example shown in Figure 1, the coating liquid supply pipe 3 also has an upward inclination (inclination angle θ') toward the coating liquid inlet 6. It is desirable that the relationship between the inclination angle θ and the inclination angle θ' is |inclination angle θ| > |inclination angle θ'|. By setting it in this way, the conductive particles that settle in the coating liquid supply pipe 3, which has a small inclination angle, settle sequentially and gradually from the heaviest particles to form the sediment 10. As a result, clumps of sediment 10 are less likely to concentrate and solidify in specific locations. Therefore, clumps of sediment 10 can be reduced, which in turn reduces clumping of the coating liquid supply pipe 3 by large clumps of sediment 10, and consequently, the coating liquid can be supplied stably to the manifold coating liquid inlet 6 over time.

[0025] Next, in section 2 of the piping inside the nozzle, as the coating liquid progresses through the piping inside the nozzle, which has a large inclination angle, some aggregates of conductive particles, which did not settle in the coating liquid supply pipe 3 but could potentially cause adverse effects later, settle and accumulate in section 2 of the piping inside the nozzle due to their own weight. This reduces the likelihood of these conductive particle clumps reaching the liquid reservoir section 4b, and as a result, the coating liquid can be supplied to the manifold section 4 stably over time.

[0026] Furthermore, the piping inside the nozzle and the coating liquid supply pipe 3 are not limited to a single cylindrical pipe as shown in Figures 1 and 2, but may also be a bent pipe, for example. In that case, it is preferable to set the angle of inclination of the pipe to be greater toward the downstream side. In addition, the piping inside the nozzle and the coating liquid supply pipe may also be curved or spiral pipes. In that case as well, it is preferable to set the angle of inclination of the pipe to be greater toward the downstream side. When using cylindrical pipes, the inner diameter of the pipe may be appropriately selected between 1 mm and 8 mm. Also, as long as it does not hinder the purpose of the present invention, the inner diameter of the piping inside the nozzle and the coating liquid supply pipe 3 may be constant or change along the way.

[0027] Furthermore, in the nozzle of the present invention, the coating liquid inlet 6, the nozzle piping, and the coating liquid outlet 4e are not necessarily limited to one. There may be two or more coating liquid inlet 22 and nozzle piping, with the nozzle piping being unified within the nozzle, or the nozzle piping may be branched midway to provide two or more coating liquid outlets 4e. There are also no particular restrictions on the shape of the coating liquid outlet 4e; it may be circular, but it may also be slit-shaped. A slit shape refers to a polygon with an aspect ratio of 2 or more, preferably a quadrilateral, and more preferably a square, with an aspect ratio of 100 or more, and more preferably 1000 or more. The aspect ratio refers to the ratio (length a / length b) of the length of the line segment between the two furthest points in the figure formed by the outer edge of the outlet (length a) to the length of the shortest line segment perpendicular to that line segment (length b). There is no particular upper limit to the aspect ratio, but it is practical to keep it below 20,000. Furthermore, it is acceptable for the coating liquid discharge ports 4e to be formed in parallel, creating a so-called porous nozzle.

[0028] In the nozzle of the present invention, it is preferable that the nozzle piping includes a space between the center of the coating liquid inlet 6 and position A such that the flow velocity of the coating liquid is 1 / 20 or more and less than 1 / 1 of the flow velocity of the coating liquid when passing through the coating liquid inlet 6. Figure 2 shows an example of such an embodiment, in which a space (linear velocity suppression space 20) larger than the inner diameter of other parts of the nozzle piping is formed. The coating liquid supplied from the coating liquid supply pipe 3 is introduced from the coating liquid inlet 22 of the linear velocity suppression space 20 and flows through the linear velocity suppression space 20 in a path such as that shown in Figure 3, sometimes changing direction by hitting the side walls that constitute the linear velocity suppression space 20, and flows out from the coating liquid outlet 23 at the top of the linear velocity suppression space 20 and is guided to the manifold section 4. It is preferable that the flow velocity of the coating liquid in the linear velocity suppression space be 1 / 20 or more and 1 / 2 or less. Here, the position corresponding to position A may be in the linear velocity suppression space 20, but it is preferable to place it downstream from the coating liquid outlet 23 of the linear velocity suppression space. Furthermore, regarding the relationship between the coating liquid inlet 22 and the coating liquid outlet 23 of the linear velocity suppression space 20, it goes without saying that it is desirable that T2' > T1', where T1' is the distance between the horizontal plane containing the center of the coating liquid discharge port 4e and the coating liquid inlet 22 of the linear velocity suppression space 20, and T2' is the distance between the horizontal plane containing the center of the coating liquid discharge port 4e and the coating liquid outlet 23 of the linear velocity suppression space 20. Here, the position for calculating the distance on the side of the coating liquid inlet 22 and the coating liquid outlet 23 is the position of the center of the vertical cross-section, that is, the centroid of the figure formed by the inner edges of each opening in the cross-section.

[0029] By providing the linear velocity suppression space 20, most of the conductive particles in the coating liquid that may aggregate to some extent and potentially cause adverse effects later will pass through this linear velocity suppression space 20, and as they do so, their own weight will cause them to form clumps of sediment 10, which will settle at the bottom of the linear velocity suppression space 20. As a result, the inflow of clumps of conductive particles into the manifold section 4 is reduced, and a coating liquid with less particle size distribution unevenness due to the sedimentation of conductive particles will be supplied to the manifold section 4 stably over time.

[0030] The size and dimensions of this linear velocity suppression space 20 are not particularly limited as long as the flow velocity of the coating liquid is 1 / 20 or more and less than 1 / 1 of the flow velocity of the coating liquid when it passes through the coating liquid inlet, preferably 1 / 20 or more and 1 / 2 or less. Multiple linear velocity suppression spaces 20 may be provided.

[0031] The nozzle of the present invention preferably has an air vent mechanism for discharging air bubbles contained in the coating liquid itself or air bubbles generated during the process of the coating liquid moving through the piping. Figure 7 shows an example of a nozzle equipped with an air vent mechanism, which can efficiently discharge air bubbles that accumulate in the upper part of the liquid reservoir to the outside of the nozzle. There are no particular restrictions on the form of the air vent mechanism, and one example is a mechanism that discharges air by pointing the air discharge pipe upward. The air vent mechanism may also discharge air bubbles together with the coating liquid.

[0032] Preferably, the nozzle of the present invention allows for the static mixer to be installed in the piping inside the nozzle and near the coating liquid inlet. Alternatively, it may be installed within the coating liquid supply piping.

[0033] A static mixer is a stationary mixer (line mixer) without a moving part. By installing it in a pipe through which a coating liquid with a low concentration of large solid particles flows, it has the function of agitating and mixing the coating liquid itself using the energy of the liquid flow, thereby promoting the dispersion of components contained in the coating liquid.

[0034] Figure 4 shows an example in which the static mixer 5 is installed at the top of the linear velocity suppression space 20. By the time the flow of the coating liquid reaches the vicinity of the static mixer 5, most of the aggregated conductive particles in the coating liquid have already formed clumps of precipitate 10 and settled at the bottom of the linear velocity suppression space 20, thus being removed from the coating liquid. Therefore, even with a highly viscous coating liquid, sufficient stirring by the elements of the static mixer 5 is possible.

[0035] Furthermore, the stirring disrupts the flow of the coating liquid, ensuring that the coating liquid itself is thoroughly mixed and remains in a constant flow state. This prevents solid components such as conductive particles in the coating liquid from re-precipitation and also disperses resins and solvents contained in the coating liquid. The shape, size, and number of elements of the static mixer 5 are preferably selected appropriately depending on the shape and volume of the piping inside the nozzle, the characteristics of the coating liquid used, and the supply flow rate. The material of the static mixer 5 is also preferably selected appropriately depending on the properties of the coating liquid, such as metal or resin.

[0036] Furthermore, as shown in Figures 5 and 6, multiple static mixers 5 may be installed, or they may be installed inside the nozzle piping or coating liquid supply piping 3, with a diameter approximately the same as the inner diameter of the nozzle piping or coating liquid supply piping 3. The static mixer 5 may also be installed in the vertical direction, the horizontal direction, or in an intermediate direction.

[0037] Methods for removing the precipitate 10 that has settled inside the nozzle piping or coating liquid supply piping include physical peeling and removal methods, and chemical dissolution methods. An example of the former is a method in which a wire with a screw-shaped or brush-shaped head attached to its tip is inserted into the piping while rotating, and the precipitate is removed by repeatedly pushing and pulling it.

[0038] An example of the latter method is to remove the precipitate 10, for example, if it is a mass of silver particles, by passing an ammonia aqueous solution containing an oxidizing agent such as hydrogen peroxide through the pipe to oxidize the silver particles into a silver-ammonium complex and dissolve it in the aqueous solution, or by passing a dilute nitric acid aqueous solution through the pipe to react the silver particles with nitrate ions and dissolve them in the aqueous solution.

[0039] The materials of each part constituting the nozzle of the present invention are not particularly limited and may be selected appropriately based on strength, ease of processing, etc. However, when removing the precipitate 10 by the latter method described above, it is necessary to select materials such as olefin resins or polyvinyl chloride resins that have high resistance to the chemicals hydrogen peroxide and ammonia aqueous solution, or stainless steel that has excellent corrosion resistance to nitric acid.

[0040] In the following examples of the present invention, a photosensitive resin composition containing silver conductive particles as the coating liquid will be used as an example. However, the nozzle of the present invention may be made from any coating liquid containing particles that are easily settled, other than silver particles, and may be made from a thermoplastic resin or thermosetting resin instead of a photosensitive resin composition.

[0041] Examples of particles other than silver conductive particles include copper particles, palladium particles, nickel particles, indium oxide particles, tin oxide particles, indium-tin oxide particles, carbon particles, titanium nitride particles, and silica. [Examples]

[0042] (Example 1) Experiments were conducted using a nozzle as shown in Figure 1. This nozzle has a cylindrical stainless steel nozzle piping section 2 with an inner diameter of 2 mm and a length of 2.8 cm, which is inclined at +45° with respect to the horizontal plane from the liquid inlet 6 downstream. A liquid reservoir section 4b is connected downstream and widens towards the downstream side, and a liquid discharge port 4e opens vertically downward. A slit-shaped liquid passage 4d is provided between the liquid reservoir section 4b and the liquid discharge port 4e. A cylindrical polyvinyl chloride liquid supply pipe 3 with an inner diameter of 5 mm and a length of 20 cm is connected to the liquid inlet 6 of the nozzle with a flange, and the liquid supply pipe 3 is connected so as to be inclined at -30° with respect to the horizontal plane from the liquid inlet 6 upstream.

[0043] On the other hand, a coating solution was prepared by mixing 80 parts by weight of pentaerythritol triacrylate as an ultraviolet-curable resin, 5 parts by weight of Irgacure 184 (manufactured by Ciba Specialty Chemicals) as a photopolymerization initiator, and 100 parts by weight of toluene as a solvent, and dispersing 12 parts by weight of silver particles with an average particle size of 4 μm as conductive particles. In addition, a polyester film with a thickness of 75 μm (Toray Industries, Inc.'s "Lumirror" (registered trademark)) was prepared as a substrate to coat with this coating solution.

[0044] Using the above-mentioned nozzle and coating solution, the coating solution was continuously applied to a moving polyester film and dried to the touch by passing it through a drying device to form a layer of silver conductive particles with a thickness of approximately 8 μm on the polyester film. Next, a photomask consisting of a 3 μm wide grid-like mesh negative pattern was placed on the silver conductive particle layer, and ultraviolet light was continuously irradiated from above the photomask and passed through a developing solution to produce a transparent conductive film in which the silver conductive particle layer was formed with a 3 μm wide grid-like mesh pattern.

[0045] Microscopic observation of the surface of the obtained transparent conductive film revealed no clumps of silver particles, indicating that it possessed the conductivity suitable for use as a touch sensor for signage applications and was a product with excellent mass-producibility, enabling continuous manufacturing. On the other hand, clumps of silver particles were formed in a band-like manner inside the coating liquid supply piping, and small clumps of silver particles were also formed near the coating liquid inlet in the piping section inside the nozzle. These clumps of silver particles could be easily removed by passing a high-flow solution such as propylene glycol monomethyl ether acetate through the system.

[0046] (Example 2) In this experiment, the nozzle shown in Figure 2 was used instead of the nozzle used in Example 1. This nozzle formed a cylindrical linear velocity suppression space 20 with an inner diameter of 20 mm and a length of 15 mm. The upstream coating liquid inlet 22 was located at the bottom surface of the linear velocity suppression space 20, and the downstream coating liquid outlet 23 was located at the top surface of the linear velocity suppression space 20. A pipe with an inner diameter of 2 mm ran horizontally from the coating liquid inlet 6 to the coating liquid inlet 22, and a pipe with an inner diameter of 2 mm ran horizontally from the coating liquid outlet 30 to the liquid reservoir 4b. Furthermore, as shown in Figure 4, a static mixer was installed on the upper side of the upstream side of the linear velocity suppression space. The coating liquid supply piping 3 and manifold section 4 were configured in the same way as in Example 1.

[0047] Using this nozzle, a transparent conductive film was manufactured in the same manner as in Example 1.

[0048] Microscopic observation of the surface of the obtained transparent conductive film revealed that the surface was even cleaner than in Example 1, possessed conductive properties suitable for use in touch sensors for personal computers, and was a product with excellent mass-producibility that could be manufactured continuously. On the other hand, clumps of settled silver particles formed in a band shape inside the coating liquid supply pipe, and small clumps of silver particles also formed at the bottom of the cylindrical space in the piping section inside the nozzle. These clumps of silver particles could be easily removed by passing a high flow rate of propylene glycol monomethyl ether acetate or the like.

[0049] (Example 3) Instead of the nozzle used in Example 1, the experiment was conducted using the nozzle shown in Figure 7. This nozzle is equipped with an air vent mechanism 24 that discharges air from the top of the liquid reservoir inlet 4a by directing the air discharge pipe upward and then sideways. Furthermore, a cylindrical static mixer 5 with a diameter of 1.6 mm and a length of 1.7 cm is provided inside the nozzle's internal piping section 2, and a cylindrical static mixer 5 with a diameter of 4.1 mm and a length of 4.5 cm is provided inside the coating liquid supply pipe 3. A transparent conductive film was manufactured using this nozzle. When the surface of the obtained transparent conductive film was observed under a microscope, the surface was even smoother than that of the transparent conductive film in Example 1. In addition, since air bubbles can be removed while in operation, continuous manufacturing is possible, which is advantageous in terms of mass production. [Explanation of symbols]

[0050] 1. Nozzle (slit nozzle) 2. Part of the piping inside the socket 20 Linear velocity suppression space 22 Coating liquid inlet 23 Coating liquid outlet 24 Air vent mechanism 3. Coating liquid supply piping 4. Manifold section 4a Inlet of liquid reservoir 4b Liquid reservoir 4c Liquid reservoir outlet 4d Coating liquid pathway 4e Coating liquid discharge port 5 Static Mixer 6. Inlet for coating liquid 10. Precipitates

Claims

1. A nozzle comprising at least a coating liquid inlet into which a coating liquid is introduced, a coating liquid outlet from which the coating liquid is discharged, and internal piping connecting the coating liquid inlet and the coating liquid outlet, wherein the relationship between the distance T1 from a horizontal plane including the center of the coating liquid outlet to the center of the coating liquid inlet and the distance T2 between the horizontal plane and the position in the internal piping of the nozzle that is furthest from the horizontal plane (referred to as "position A") is T2 > T1, and the internal piping of the nozzle has a portion between the center of the coating liquid inlet and position A, where the inclination angle from the center of the coating liquid inlet toward position A is +5 to +90 degrees with respect to the horizontal plane including the center of the coating liquid inlet.

2. The nozzle according to claim 1, characterized in that the inclination angle is +25 to +85 degrees.

3. The nozzle according to claim 1 or claim 2, wherein the coating liquid discharge port is a slit-shaped discharge port with an aspect ratio of 2 or more, and the piping inside the nozzle has a space that is widened to the width of the slit-shaped discharge port between the upstream side of position A and the coating liquid discharge port.

4. The nozzle according to claim 1 or claim 2, wherein the piping inside the nozzle is provided with a space between the center of the coating liquid inlet and position A such that the flow velocity of the coating liquid is 1 / 20 or more and less than 1 / 1 of the flow velocity of the coating liquid when passing through the coating liquid inlet.

5. The nozzle according to claim 1 or claim 2, further comprising an air vent mechanism within the nozzle.

6. The nozzle according to claim 1 or claim 2, further comprising a static mixer in the piping inside the nozzle.

7. The nozzle according to claim 6, wherein the static mixer occupies 75 to 95% of the inner diameter cross-sectional area of ​​the piping on which the static mixer is provided.

8. The nozzle according to claim 1 or claim 2, wherein the coating liquid is a photosensitive resin composition containing particles, a photopolymerization initiator, a polymerizable compound, and a solvent.

9. The nozzle according to claim 8, wherein the particles are conductive particles.

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