Nozzle head, spinning method, and spinning device

Abstract

To provide a fiber assembly having a uniform basis weight.SOLUTION: Inside a cylindrical nozzle head 20, a spinning electrode 50 is disposed, a spinning solution 31 is filled, and a plurality of spinning holes 36 are arranged at predetermined intervals. The nozzle head 20 has supply ports 61 and 62 disposed at both ends, through which the spinning solution 31 is supplied.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a nozzle head, a spinning method, and a spinning device. [Background technology]

[0002] The electrospinning apparatus (spinning apparatus) disclosed in Patent Document 1 is an apparatus that spins ultrafine fibers from a spinning solution and continuously forms a fiber aggregate made of ultrafine fibers. The reservoir of the electrospinning apparatus is composed of a tube extending along its axis. The reservoir has multiple spinning holes that are spaced apart at regular intervals along the axis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-084387 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional spinning devices have a problem in that the amount of spinning solution discharged from each spinning hole is not uniform, resulting in non-uniform basis weight of the fiber aggregate. The present disclosure has been made in view of the above-described circumstances, and aims to make the basis weight of a fiber aggregate uniform. The present disclosure can be realized as the following aspects. [Means for solving the problem]

[0005] A cylindrical nozzle head in which a spinning electrode is disposed inside, a spinning solution is filled inside, and a plurality of spinning holes are formed at predetermined intervals, a nozzle head provided at both ends and having supply ports through which the spinning solution is supplied; [Effects of the Invention]

[0006] According to the present disclosure, the basis weight of the fiber aggregate can be made uniform. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram of a spinning device according to the first embodiment. [Figure 2] FIG. 2 is a partial structural view of the spinning device seen from a different direction than FIG. [Figure 3] FIG. 3 is a plan view of the nozzle head as seen from the collection member side. [Figure 4] FIG. 4 is a cross-sectional view of the nozzle head. DETAILED DESCRIPTION OF THE INVENTION

[0008] Here, a preferred example of the present disclosure will be described. A spinning method in which a voltage is applied between a spinning electrode and a collector electrode to spray a jet of charged spinning solution from the spinning electrode toward the collector electrode, and the jet is collected as a fiber aggregate by a collecting member arranged on the spinning electrode side of the collector electrode, The spinning electrode is placed inside a cylindrical nozzle head in which a plurality of spinning holes are formed at predetermined intervals, a spinning method, comprising supplying the spinning solution from both ends of the nozzle head, filling the inside of the nozzle head with the spinning solution, and spraying the spinning solution from the plurality of spinning holes. The spinning method includes reciprocating the nozzle head in the longitudinal direction of the nozzle head, and injecting the spinning solution from each of the plurality of spinning holes. A cylindrical nozzle head in which a spinning electrode is disposed and a spinning solution is filled, and in which a plurality of spinning holes are formed at predetermined intervals; a collector electrode disposed at a location remote from the nozzle head; A spinning apparatus in which a voltage is applied between the spinning electrode and the collector electrode, so that a jet of the charged spinning solution is sprayed toward the collector electrode, and the jet is collected as a fiber aggregate by a collecting member arranged on the nozzle head side of the collector electrode, A spinning apparatus comprising a supply unit for supplying the spinning solution to both end sides of the nozzle head.

[0009] <Embodiment 1> In this embodiment, the present disclosure is applied to a spinning apparatus 10. Hereinafter, the spinning apparatus 10 of this embodiment will be described with reference to Figs. 1 to 4. Figs. 1 and 2 are diagrams showing a schematic configuration of the spinning apparatus 10. Fig. 3 is a diagram showing an example of the arrangement of a nozzle head 20 in the spinning apparatus 10. Fig. 4 is a cross-sectional view of the nozzle head 20.

[0010] (Configuration of spinning device) 1 and 2 is configured as an electrospinning device. The spinning device 10 is a device that spins ultrafine fibers from a spinning solution 31 and continuously forms a fiber aggregate 14 made of the ultrafine fibers, such as a nonwoven fabric.

[0011] The spinning solution 31 contains a resin material that forms ultrafine fibers as a solute, dissolved or dispersed in a volatile solvent. Examples of the solute include synthetic resins such as polyacrylonitrile (PAN), polypropylene (PP), and polyethylene (PE). Examples of the solvent include compounds such as N,N-dimethylacetamide (DMA), N,N-dimethylformamide (DMF), and tetrahydrofuran (THF).

[0012] As shown in FIGS. 1 to 3, the spinning device 10 includes a nozzle head 20, a collector electrode 17, a collection member 11, tanks 41 and 45, pumps 43 and 47, and a power source 44.

[0013] The nozzle head 20 is a member for spraying the stored spinning solution 31 to the outside. When the spinning device 10 is operated, the inside of the nozzle head 20 is filled with the spinning solution 31. The nozzle head 20 is cylindrical and elongated in one direction (the Y-axis direction in each drawing). The total length of the nozzle head 20 is, for example, 450 mm or more. There is no particular upper limit to the total length of the nozzle head 20, but it is, for example, 1200 mm or less.

[0014] The nozzle head 20 has a plurality of spinning holes 36 formed at predetermined intervals along the longitudinal direction of the nozzle head 20. The spinning holes 36 are holes for injecting the spinning solution 31. The spinning holes 36 open to the side of the nozzle head 20. The longer the overall length of the nozzle head 20 and the greater the number of spinning holes 36, the greater the variation in pressure loss of the spinning solution 31 toward each spinning hole 36. For this reason, the technology of the present disclosure, which can suppress the variation in pressure loss of the spinning solution 31 toward each spinning hole 36, is effective. In each figure, the nozzle head 20 is schematically depicted with the dimensions of each part of the nozzle head 20 and the number of spinning holes 36 changed.

[0015] As shown in Fig. 4, the nozzle head 20 includes a solution tank 30 and a spinning electrode (supply electrode) 50. The solution tank 30 is for storing the amount of spinning solution 31 required for spinning. The solution tank 30 is configured by a cylindrical tube extending linearly along the central axis (axis line L1). The solution tank 30 is formed of, for example, a solvent-resistant resin. The solvent-resistant resin is, for example, a synthetic resin such as fluororesin (PTFE).

[0016] The solution tank 30 includes an inner tube 32 and an outer tube 33. The outer tube 33 is a circular tube that extends linearly along the axis L1. The outer diameter of the outer tube 33 is, for example, 10 mm. The space between the outer peripheral surface of the inner tube 32 and the inner peripheral surface of the outer tube 33 forms a storage space 35 in which the spinning solution 31 is stored. A spinning hole 36 is provided at the top of the outer tube 33.

[0017] The radiation holes 36 are circular in plan view. The diameter of the radiation holes 36 is preferably 0.5 mm to 2.0 mm, for example, 1.0 mm. The radiation holes 36 are provided at the highest part (top) of the upper part of the outer tube 33. The radiation holes 36 are provided at multiple locations spaced apart at regular intervals along the axis L1. The distance between adjacent radiation holes 36 is preferably 5 mm to 20 mm, for example, 10 mm. The distance between adjacent radiation holes 36 is the distance between the centers of the radiation holes 36. The multiple radiation holes 36 are arranged in a row along the axis L1.

[0018] The inner pipe 32 is a pipe that supplies the spinning solution 31 to the storage space 35. The inner pipe 32 is a circular tube that extends linearly along the axis L1. The diameter of the inner pipe 32 is smaller than the diameter of the outer pipe 33. The inner pipe 32 is inserted into the outer pipe 33 so as to be coaxial with the outer pipe 33 (coaxial with the axis L1).

[0019] A circular inner hole 37 is provided at the top of the inner tube 32. The inner hole 37 is a hole that supplies the spinning solution 31 from the inside to the outside of the inner tube 32. The inner holes 37 are provided at multiple locations spaced apart at regular intervals (for example, 10 mm intervals) in the direction along the axis L1. The multiple inner holes 37 are arranged in a row along the axis L1. The inner holes 37 are provided at positions that are included in the cross section when the nozzle head 20 is cut along a plane that includes the spinning holes 36 and the axis L1.

[0020] As shown in FIG. 4 , the nozzle head 20 has supply ports 61 and 62 provided at both ends thereof and through which the spinning solution 31 is supplied. The supply ports 61 and 62 are openings through which the spinning solution 31 is supplied. Specifically, the supply ports 61 and 62 are provided such that both ends of the inner tube 32 protrude from both ends of the outer tube 33 and open toward both sides in the axial direction. Both ends of the outer tube 33 are closed by disk-shaped members having through holes 34. Pipes 42 and 46 are connected to the supply ports 61 and 62, respectively. When connected to the supply ports 61 and 62, the pipes 42 and 46 extend along the axis L1 from the connection portions with the nozzle head 20. The connection mode of the pipes 42 and 46 is not particularly limited. However, the pipe 42 is connected to the supply port 61 at one end in the Y-axis direction, and the pipe 46, which is a system separate from the supply port 61 at the one end, is connected to the supply port 62 at the other end.

[0021] The spinning electrode 50 is formed of a conductive material such as metal. The spinning electrode 50 is, for example, a stainless steel wire. The wire diameter of the spinning electrode 50 is, for example, 0.9 mm. As shown in FIG. 4, the spinning electrode 50 is composed of a wire (wire-shaped member) having a diameter smaller than the inner diameter of the inner tube 32. In the solution tank 30, the entire spinning electrode 50 is immersed in the spinning solution 31. That is, the entire outer surface of the spinning electrode 50 is in contact with the spinning solution 31 in the storage space 35.

[0022] The spinning electrode 50 has a spiral shape (coil shape) extending along the axis L1 of the solution tank 30 in the solution tank 30. The spinning electrode 50 is wound in a circular shape when viewed from the direction of the axis L1. The length of the spinning electrode 50 is longer than the length of the central axis of the solution tank 30 (the length along the axis L1 between both ends of the solution tank 30). Therefore, the spinning electrode 50 can have a larger contact area with the spinning solution 31 than a configuration (linear configuration) having the same length as the length of the central axis of the solution tank 30 (the length along the axis L1 between both ends of the solution tank 30). In addition, the efficiency of imparting charge from the spinning electrode 50 to the spinning solution 31 can be improved. Although not shown, the spinning electrode 50 is connected to wiring connected to a power source 44, for example, through a through hole provided at one end of the outer tube 33 (the right end in FIG. 4).

[0023] As shown in Figure 4, the spinning hole 36 is provided in the solution tank 30 at a position (position surrounding the top 51) that includes the top 51 that appears when the spinning electrode 50 is cut on a plane including the axis L1. For example, the top 51 appears when the spinning electrode 50 is cut on a plane that includes the axis L1 and is parallel to the vertical direction. Since the top 51 is exposed from the spinning hole 36, the spinning solution 31 in an electrically charged state is easily sprayed directly from the spinning hole 36. That is, the spinning solution 31 is easily sprayed in an electrically charged state.

[0024] As shown in Fig. 1, the collector electrode 17 is disposed between the delivery roller 12 and the take-up roller 15. The collector electrode 17 is formed of a conductive material such as metal. The collector electrode 17 is formed in a flat plate shape extending in the width direction of the collecting member 11 (the left-right direction in Fig. 2). The collector electrode 17 is in contact with or close to the upper surface of the collecting member 11. The collecting member 11 is disposed along the surface of the collector electrode 17 on the spinning electrode 50 (see Fig. 4) side (the nozzle head 20 side).

[0025] The collection member 11 is strip-shaped and is disposed on the nozzle head 20 side of the collector electrode 17. The direction (X-axis direction in each drawing) perpendicular to the width direction (Y-axis direction in each drawing) of the collection member 11 is defined as the front-rear direction. The collection member 11 is formed of a flexible material, for example, a collection fabric such as a nonwoven fabric. The collection member 11 is wound around a feed roller 12 to form a roll 13. The collection member 11 is held horizontally between the feed roller 12 and a take-up roller 15, and is fed in the X-axis direction, with a fiber aggregate 14 layered on its lower surface. The collection member 11 with the fiber aggregate 14 layered on it is taken up by the take-up roller 15 to form a roll 16. When the fiber aggregate 14 is to be used, the collection member 11 with the layered fiber aggregate 14 is pulled out from the roll 16, and the fiber aggregate 14 is peeled off from the collection member 11.

[0026] 3, the spinning solution 31 is stored inside the tanks 41 and 45. The tank 41 and the solution tank 30 are connected by a pipe 42. The tank 45 and the solution tank 30 are connected by a pipe 46.

[0027] The pumps 43 and 47 are disposed midway through the pipes 42 and 46, and supply the spinning solution 31 in the tanks 41 and 45 into the solution tank 30. The pumps 43 and 47 are, for example, plunger pumps, and are capable of adjusting the flow rate of the spinning solution 31. The pumps 43 and 47 are adjusted so that the flow rate of the spinning solution 31 at the supply port 61 and the flow rate of the spinning solution 31 at the supply port 62 in one nozzle head 20 are approximately uniform. The pumps 43 and 47 correspond to supply units that supply the spinning solution 31 to both end sides of the nozzle head 20.

[0028] The power supply 44 is composed of a DC power supply. The positive electrode of the power supply 44 is connected to the spinning electrode 50, and the negative electrode is connected to the collector electrode 17.

[0029] Next, the arrangement of the nozzle head 20 will be described. Fig. 3 is a plan view of the nozzle head 20 as seen from the side of the collecting member 11. The Y-axis direction in Fig. 3 corresponds to the width direction of the collecting member 11. The spinning device 10 is equipped with a plurality of nozzle heads 20.

[0030] The plurality of nozzle heads 20 are arranged with the longitudinal direction of each nozzle head 20 facing the width direction of the collecting member 11. The plurality of nozzle heads 20 are arranged in a plane approximately parallel to the collecting member 11. The plurality of nozzle heads 20 are arranged below the collecting member 11 with the spinning holes 36 facing upward. The plurality of nozzle heads 20 are attached to a stage 21 to form a unit 22.

[0031] The multiple nozzle heads 20 are arranged so that they are aligned in the width direction of the capturing member 11. The spinning device 10 is configured so that, rather than one nozzle head being aligned so that it traverses the width direction of the capturing member 11 once, multiple divided nozzle head groups are arranged so that they traverse the width direction of the capturing member 11 once. In FIG. 3, a group of nozzle heads 20 arranged so that they traverse the width direction of the capturing member 11 once is referred to as nozzle head groups 20A, 20B, 20C, and 20D. For each of the nozzle heads 20 arranged so that they traverse the width direction of the capturing member 11 once, there are multiple groups in total. In this embodiment, there are four nozzle head groups 20A to 20D. The nozzle head groups 20A to 20D are aligned at approximately equal intervals in the front-to-rear direction of the capturing member 11.

[0032] The multiple nozzle heads 20 are arranged on both sides of the widthwise center of the capturing member 11. Specifically, four of the eight nozzle heads 20 are arranged on one widthwise side of the capturing member 11 (the upper side in FIG. 3). Four of the eight nozzle heads 20 are arranged on the other widthwise side of the capturing member 11 (the lower side in FIG. 3). With this configuration, when the fiber aggregate 14 is used by being folded at the widthwise center, the portion of the fiber aggregate 14 that overlaps the gap between the upper nozzle head 20 in FIG. 3 and the lower nozzle head 20 in FIG. 3 and is likely to cause unevenness in basis weight can be set as the folding position.

[0033] The nozzle heads 20, which are arranged side by side in the width direction of the collection member 11, are offset by a predetermined distance in the front-to-rear direction (X-axis direction) of the collection member 11. The distance at which the nozzle heads 20 are offset in the X-axis direction is not particularly limited, but is, for example, equal to or greater than the outer diameter of the nozzle head 20 and equal to or less than 30 mm. The multiple nozzle heads 20 are arranged in a staggered manner. Specifically, the nozzle heads 20 arranged on the upper side of FIG. 3 and the nozzle heads 20 arranged on the lower side of FIG. 3 are arranged alternately.

[0034] (Method for manufacturing fiber assembly) A method for producing a fiber aggregate 14 will be described with reference to Figures 1 and 2. The spinning device 10 is operated, and the collecting member 11 is sent from the delivery roller 12 to the take-up roller 15 at a constant speed while being in contact with or close to the lower surface of the collector electrode 17. The pumps 43 and 47 are also operated to supply the spinning solution 31 to both ends of the nozzle head 20. Specifically, the spinning solution 31 in the tanks 41 and 45 is supplied into the inner tube 32 from the supply ports 61 and 62, as indicated by the arrows in Figure 4. The spinning solution 31 supplied into the inner tube 32 flows into the storage space 35 from the inner hole 37 of the inner tube 32 and fills the storage space 35. As a result, the spinning solution 31 is uniformly applied to the spinning electrode 50.

[0035] Furthermore, a voltage is applied between the spinning electrode 50 and the collector electrode 17. Specifically, the spinning electrode 50 is set as a positive electrode, and the collector electrode 17 is set as a negative electrode, and a voltage is applied between the two electrodes from the power source 44. As a result, the entire spinning solution 31 in the solution tank 30 is positively charged. The spinning solution 31 is charged so that the charge distribution around the spinning electrode 50 is uniform in the circumferential direction.

[0036] The spinning solution 31 is sprayed from each of the multiple spinning holes 36 in the nozzle head 20. Charges are induced and accumulated on the surface of the spinning solution 31 exposed in the spinning holes 36. These charges repel each other, and this repulsive force counteracts the surface tension of the spinning solution 31. The spinning solution 31 is attracted by an electrostatic force (Coulomb force) acting along the electric field lines toward the collector electrode 17. When the electrostatic force overcomes the surface tension of the spinning solution 31, the charged spinning solution 31 begins to spray from the multiple spinning holes 36. Then, jets 38 of the charged spinning solution 31 are sprayed simultaneously from the multiple spinning holes 36, respectively, toward the collector electrode 17.

[0037] In this embodiment, the nozzle head 20 is reciprocated in the longitudinal direction of the nozzle head 20 (the direction of the hollow arrow in FIG. 3) while the spinning solution 31 is sprayed from the plurality of spinning holes 36. The width of the reciprocating movement is preferably 100% or more and 200% or less of the spacing between the plurality of spinning holes 36, for example, 10 mm or more and 20 mm or less. By reciprocating the entire unit 22 in the direction of the hollow arrow in FIG. 3, the plurality of nozzle heads 20 can be reciprocated in the same manner.

[0038] The fibers sprayed toward the collector electrode 17 are split and collected as a fiber aggregate 14 by the collection member 11. Because the surface area of each jet 38 is large compared to its volume, the solvent in the jet 38 evaporates efficiently. This evaporation also reduces the volume of the jet, increasing the charge density. This increases the repulsive force of the charged spinning solution 31, causing each jet 38 to split into even thinner jets. Through this process, ultrafine fibers are spun, and a fiber aggregate 14 made of ultrafine fibers is collected on the lower surface of the collection member 11.

[0039] (Action and effect) Next, the effects of this embodiment will be described. In the spinning apparatus 10 of this embodiment, the nozzle head 20 has supply ports 61, 62 provided at both ends. With this configuration, by supplying the spinning solution 31 from both sides of the nozzle head 20, the discharge amount for each spinning hole 36 can be made more uniform than in a configuration in which the spinning solution 31 is supplied from only one end of the nozzle head. Therefore, the basis weight of the fiber aggregate 14 can be made more uniform.

[0040] Hereinafter, a concrete explanation will be given by a demonstration experiment. First, the other end side of the nozzle head 20 was blocked, and the spinning solution 31 was supplied only from one end side of the nozzle head 20, and the discharge amount of the spinning solution 31 from each spinning hole 36 was measured. When the spinning solution 31 was supplied only from one end side of the nozzle head 20, the discharge amount of the spinning solution 31 decreased as the position of the spinning hole 36 moved away from the supply port, and became approximately constant when the position of the spinning hole 36 moved away from the supply port by a predetermined distance or more. Next, the spinning solution 31 was supplied from both sides of the nozzle head 20, and the discharge amount of the spinning solution 31 from the spinning hole 36 was measured. When the spinning solution 31 was supplied from both sides of the nozzle head 20, the discharge amount of the spinning solution 31 became approximately constant regardless of the position of the spinning hole 36. In this way, it was found that the discharge amount for each spinning hole 36 can be made uniform by supplying the spinning solution 31 from both sides of the nozzle head 20. This is presumably because supplying the spinning solution 31 from both sides of the nozzle head 20 made it possible to suppress variations in pressure loss of the spinning solution 31 heading toward each spinning hole 36 .

[0041] In the spinning method of this embodiment, the nozzle head 20 is reciprocated in the longitudinal direction of the nozzle head 20 while the spinning solution 31 is sprayed from each of the multiple radiation holes 36. If the nozzle head 20 were fixed without being reciprocated in the longitudinal direction, there is a concern that unevenness in basis weight may occur in the fiber aggregate 14, for example, at the portion of the collecting member 11 that overlaps with the radiation holes 36 and at the portion that overlaps with the intermediate position between adjacent radiation holes 36, 36. In this embodiment, by reciprocating the nozzle head 20 in the longitudinal direction of the nozzle head 20, unevenness in basis weight of the fiber aggregate 14 caused by the overlap position between the collecting member 11 and the radiation holes 36 can be suppressed. Therefore, the basis weight of the fiber aggregate 14 can be made even more uniform.

[0042] <Other embodiments> The present disclosure is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope. (1) The nozzle unit may be cylindrical or may have a rectangular cylindrical shape. The number and arrangement of the nozzle heads may be changed as appropriate. For example, there may be a single nozzle head instead of multiple nozzle heads. Only one nozzle head may be arranged in the X-axis direction of FIG. 3. Only one nozzle head may be arranged in the Y-axis direction of FIG. 3, or three or more nozzle heads may be arranged. (2) In a configuration in which multiple nozzle heads are arranged side by side in the Y-axis direction, the nozzle heads may be arranged as follows: For nozzle heads adjacent to each other in the Y-axis direction in Fig. 3, the distance between the nearest radiation holes in each nozzle head in the Y-axis direction may be approximately the same as the distance between the radiation holes in each nozzle head in the Y-axis direction. According to this configuration, unevenness in basis weight of the spun fiber aggregate is unlikely to occur in the area of the fiber aggregate that overlaps the gap between adjacent nozzle heads in the Y-axis direction. Furthermore, for nozzle heads adjacent to each other in the Y-axis direction, the solution tanks may partially overlap as long as the radiation holes do not overlap in the X-axis direction. Furthermore, nozzle heads adjacent to each other in the Y-axis direction do not need to be misaligned in the X-axis direction as long as piping and the like can be routed. In other words, nozzle heads adjacent to each other in the Y-axis direction may be arranged so that their positions in the X-axis direction are aligned. (3) A plurality of spinning holes may be arranged in a zigzag pattern on both sides of the axis L1. The pitch of the spinning holes may not be constant. The pitch of the spiral shape of the spinning electrode may also not be constant, but it may be consistent with the pitch of the spinning holes. The size, position, and pitch of the holes in the inner tube can also be changed as appropriate. (4) The shape, size, and position of the supply port can be changed as appropriate. The supply ports may be open to the side surfaces of the nozzle head at both ends of the nozzle head. Furthermore, the spinning solution may be supplied from a single pump to each of the supply ports provided at both ends of the nozzle head. (5) The storage space between the inner tube and the outer tube may be filled with a porous body. With this configuration, the porous body acts as a resistance to the flow of the spinning solution from the inner hole of the inner tube toward the spinning holes of the outer tube. Therefore, the variation in pressure loss of the spinning solution toward each spinning hole can be suppressed. (6) In the spinning method, the nozzle head does not need to be moved back and forth when the spinning solution is sprayed from each of the plurality of spinning holes.

[0043] The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. While the invention has been described with reference to exemplary embodiments, it is understood that the language used in describing and illustrating the invention is descriptive and exemplary, rather than limiting. As detailed herein, changes may be made within the purview of the appended claims without departing from the scope or spirit of the invention in its form. While the description of the invention has referred to specific structures, materials, and embodiments, it is not intended that the invention be limited to the disclosures herein; rather, the invention is intended to cover all functionally equivalent structures, methods, and uses within the scope of the appended claims. [Explanation of symbols]

[0044] 10...Spinning device 11...Collection member 14...Fiber assembly 17...Collector electrode 20...Nozzle head 31...Spinning solution 36...Spinning hole 43, 47...Pump (supply section) 50...Spinning electrode 61,62...Supply port

Claims

1. A cylindrical nozzle head in which a spinning electrode is disposed inside, a spinning solution is filled inside, and a plurality of spinning holes are formed at predetermined intervals, The spinning nozzle has supply ports provided at both ends through which the spinning solution is supplied, It has an inner tube and an outer tube arranged coaxially, The outer tube is provided with the radiation holes, The inner tube has an inner hole, a space between an outer peripheral surface of the inner tube and an inner peripheral surface of the outer tube serves as a storage space in which the spinning solution is stored, The spinning solution is supplied from the inner tube through the inner hole to the storage space, The spinning solution in the storage space is ejected to the outside through the spinning holes.

2. A spinning method in which a voltage is applied between a spinning electrode and a collector electrode to spray a jet of charged spinning solution from the spinning electrode toward the collector electrode, and the jet is collected as a fiber aggregate by a collecting member arranged on the spinning electrode side of the collector electrode, The spinning electrode is placed inside a cylindrical nozzle head in which a plurality of spinning holes are formed at predetermined intervals, a spinning method in which the spinning solution is supplied to both end sides of the nozzle head, the inside of the nozzle head is filled with the spinning solution, and the spinning solution is sprayed from the plurality of spinning holes, The nozzle head includes an inner tube and an outer tube arranged coaxially, The outer tube is provided with the radiation holes, The inner tube has an inner hole, a space between an outer peripheral surface of the inner tube and an inner peripheral surface of the outer tube serves as a storage space in which the spinning solution is stored, The spinning solution is supplied from the inner tube through the inner hole to the storage space, The spinning solution in the storage space is ejected to the outside through the spinning hole.

3. The spinning method according to claim 2, wherein the spinning solution is sprayed from each of the plurality of spinning holes while the nozzle head is reciprocated in a longitudinal direction of the nozzle head.

4. Spinning electrodes are placed inside a cylindrical nozzle head having a plurality of spinning holes formed at predetermined intervals, the nozzle head being filled with a spinning solution; a collector electrode disposed at a location remote from the nozzle head; A spinning apparatus in which a voltage is applied between the spinning electrode and the collector electrode, so that a jet of the charged spinning solution is sprayed toward the collector electrode, and the jet is collected as a fiber aggregate by a collecting member arranged on the nozzle head side of the collector electrode, a supply unit for supplying the spinning solution to both end sides of the nozzle head, The nozzle head includes an inner tube and an outer tube arranged coaxially, The outer tube is provided with the radiation holes, The inner tube has an inner hole, a space between an outer peripheral surface of the inner tube and an inner peripheral surface of the outer tube serves as a storage space in which the spinning solution is stored, The spinning solution is supplied from the inner tube through the inner hole to the storage space, The spinning device is configured so that the spinning solution in the storage space is sprayed to the outside through the spinning holes.

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