JP4800879B2 - Polymer solution supply member, electrospinning apparatus, and method for producing electrospun nonwoven fabric - Google Patents

Description

  The present invention relates to a polymer solution supply member, an electrospinning apparatus, and a method for producing an electrospun nonwoven fabric. More specifically, the present invention relates to a polymer solution supply member, an electrospinning apparatus, and a method for producing an electrospun nonwoven fabric that can produce an electrospun nonwoven fabric with high productivity.

  If the fiber diameter of the fibers that make up the nonwoven fabric is small, the fiber diameter of the fibers that make up the nonwoven fabric is excellent because it has excellent performance such as separation performance, liquid retention performance, wiping performance, concealment performance, insulation performance, or flexibility. Is preferably small. As a method for producing a nonwoven fabric composed of fibers having such a small fiber diameter, a polymer solution is supplied to the spinning space, and an electric field is applied to the supplied polymer solution to fiberize the polymer solution. A so-called electrospinning method is known in which a non-woven fabric is directly collected after forming.

  When manufacturing a nonwoven fabric by such an electrospinning method, it was common to use a metal nozzle having a tip such as an injection needle as a polymer solution supply member for supplying a polymer solution to a spinning space. Since such a polymer solution supply member preferably uses a plurality of nozzles of two or more in order to increase the productivity of the nonwoven fabric, the applicant of the present application circulates and moves a large number of nozzles in an oval shape, A method for improving the productivity of the nonwoven fabric was proposed (Patent Document 1). According to this method, although the productivity of the nonwoven fabric can be improved, it is necessary to replace the nozzle after a certain period of time or to clean the nozzle in order to ensure the stability of the quality. Replacing or cleaning them is a very complicated operation due to the large number of nozzles, and in this respect, the productivity of the nonwoven fabric is poor. In addition, since fibers may adhere to the tip of the nozzle during non-woven fabric production, that is, spinning, it is necessary to remove the adhered fibers in order to ensure the quality stability, but the nozzle circulates and moves. Therefore, it is difficult to remove the attached fibers, and stable production may be difficult. Furthermore, there is a method of increasing the supply amount of the polymer solution to the spinning space as one method for increasing the productivity of the nonwoven fabric. However, when a nozzle is used as the polymer solution supply member, the supply amount may be increased too much. However, it was difficult to increase productivity from this point.

JP 2006-112023 A (Claims etc.)

  The present invention has been made to solve the above-described problems, and provides a polymer solution supply member, an electrostatic spinning device, and a method for producing an electrostatic spinning nonwoven fabric capable of producing an electrostatic spinning nonwoven fabric stably and with high productivity. The purpose is to provide.

  The invention according to claim 1 of the present invention is “a polymer solution supply member for supplying a polymer solution to a spinning space used in an electrostatic spinning method, wherein the polymer solution supply member has a hollow tube having a hollow portion. When viewed from the above, it has a corrugated shape, and has a through-hole penetrating from the inner peripheral wall of the hollow portion to the outer peripheral wall at the lowest point and / or the uppermost point of the corrugated shape. The polymer solution supply member. "

  The invention according to claim 2 of the present invention is "the polymer solution supply member according to claim 1, wherein a portion through which the through hole of the outer peripheral wall passes is flat or recessed."

  The invention according to claim 3 of the present invention is the polymer solution according to claim 1 or 2, characterized by having a corrugated shape when viewed from the side because the hollow tube is in a spiral state. Supply member. "

  The invention according to claim 4 of the present invention is "an electrostatic spinning apparatus including the polymer solution supply member according to any one of claims 1 to 3".

  The invention according to claim 5 of the present invention is “a method for producing an electrospun nonwoven fabric using the electrospinning apparatus according to claim 4”.

  The invention according to claim 1 of the present invention can be easily carried out regardless of whether it is replaced or washed because the polymer solution supply member comprises a hollow tube. Even if the fibers adhere during spinning, the fibers do not protrude like the nozzle, so that the attached fibers can be easily removed. In addition, the polymer solution supply member consists of a hollow tube, surface tension tends to act on the polymer solution, and the polymer solution is easily held on the outer peripheral wall of the polymer solution supply member, so the amount of supply of the polymer solution to the spinning space can be reduced. Can do a lot. Further, the polymer solution supply member has a corrugated shape when viewed from the side, and the electric field strength in the vicinity of the through hole is increased by providing the through hole at the lowest point and / or the uppermost point of the corrugated shape. Therefore, the polymer solution can be stably supplied and fiberized. As a result, an electrospun nonwoven fabric can be produced stably and with high productivity.

  In the invention according to claim 2 of the present invention, the portion of the outer peripheral wall through which the through-hole penetrates is flat or depressed, so that surface tension is more likely to act on the polymer solution, and the polymer solution is applied to the outer peripheral wall of the polymer solution supply member. Therefore, the amount of the polymer solution supplied to the spinning space can be further increased, and the electrospun nonwoven fabric can be produced with higher productivity.

  The invention according to claim 3 of the present invention can be applied to various electrostatic spinning apparatuses because the hollow tube is in a spiral state. For example, in the case where the hollow tube is made of a flexible material, the polymer solution supply member can be circulated and moved (particularly, elliptically circulated) to produce a nonwoven fabric with a uniform basis weight. Further, when the hollow tube is made of a flexible material, it is easy to change the interval between the through holes.

  Since the invention concerning Claim 4 of this invention is equipped with the polymer solution supply member in any one of Claims 1-3, it is an apparatus which can manufacture an electrospun nonwoven fabric stably and with sufficient productivity.

  Since the invention according to claim 5 of the present invention is a method using the electrospinning apparatus according to claim 4, it is a method capable of producing an electrospun nonwoven fabric stably and with high productivity.

  The polymer solution supply member of the present invention will be described with reference to FIGS. FIG. 1 is a view of the polymer solution supply member as seen from the side, and FIG. 2 is a cross-sectional view of the hollow tube at the lowest point.

  The polymer solution supply member 1 in FIG. 1 has a hollow tube 2 having a hollow portion 3 in a spiral state, and has a circular cross-sectional shape at the lowest point PL1, PL2, PL3, PL4, PL5 in the spiral state, A through hole 4 that penetrates from the inner peripheral wall of the hollow portion 3 to the outer peripheral wall is provided. Since the polymer solution supply member 1 in FIG. 1 has such a configuration, the polymer solution is supplied from the polymer solution storage portion to the hollow portion 3 of the polymer solution supply member 1, and the supplied polymer solution passes through the through holes 4. Supplied to the spinning space. As can be seen from FIG. 1, when the polymer solution supply member 1 is replaced, the polymer solution supply member 1 may be replaced. When cleaning, the outer peripheral wall surface of the polymer solution supply member 1 is smooth and easy to clean. Further, even if fibers adhere during spinning, the outer peripheral wall surface is smooth, so that it is easy to remove the adhered fibers. Further, since the surface tension is likely to act on the polymer solution supplied from the hollow tube 2 and the polymer solution is easily held on the outer peripheral wall at the lowest point of the hollow tube 2, the supply amount of the polymer solution to the spinning space Can be more. Furthermore, since the through hole 4 is provided at the lowest point of the corrugated shape, the electric field in the vicinity of the through hole 4 tends to be stronger than the other part of the hollow tube 2, so that the polymer solution can be supplied stably. Can be fiberized. Therefore, the polymer solution supply member 1 of the present invention can produce an electrospun nonwoven fabric stably and with high productivity. As shown in FIG. 1, the hollow tube 2 is in a spiral state, so that various electrostatic spinning apparatuses can be supported. For example, in the case where the hollow tube is made of a flexible material, the polymer solution supply member can be circulated and moved (particularly, elliptically circulated) to produce a nonwoven fabric with a uniform basis weight. Further, when the hollow tube is made of a flexible material, it is easy to change the interval between the through holes. In addition, although the polymer solution supply member 1 of FIG. 1 has a through-hole at the lowest point, the same effect is obtained even at the uppermost point instead of the lowermost point. When both have through holes, a nonwoven fabric can be produced on both sides.

  The cross-sectional shape at the lowest point of the polymer solution supply member 1 of the present invention may be any shape. Another cross-sectional shape at the lowest point of the polymer solution supply member 1 will be described with reference to FIGS.

  In FIG. 3, the cross-sectional shape is a semicircular shape, and the through hole 4 penetrates from the inner peripheral wall of the hollow portion 3 to the curved outer peripheral wall. Thus, the cross-sectional shape at the lowest point need not be circular.

  In FIG. 4, the cross-sectional shape at the lowest point is a square shape (square shape), and the through hole 4 penetrates from the inner peripheral wall of the hollow portion 3 to the flat outer peripheral wall. As described above, when the portion through which the through hole 4 penetrates is a flat outer peripheral wall, the polymer solution supplied from the through hole 4 is easily held by the flat outer peripheral wall due to surface tension. The supply amount can be increased, and an electrospun nonwoven fabric can be produced with higher productivity. In FIG. 5, the cross-sectional shape at the lowest point is a semicircular shape, and the through hole 4 penetrates from the inner peripheral wall of the hollow portion 3 to the flat outer peripheral wall. Also in this case, similarly to the case of FIG. 4, the supply amount of the polymer solution to the spinning space can be increased, and the electrospun nonwoven fabric can be produced with higher productivity. In FIG. 6, the flattening auxiliary material 5 is attached to the hollow tube 2 having a circular cross-sectional shape at the lowest point so that the portion through which the through hole 4 penetrates becomes flat. Since this polymer solution supply member 1 also has a flat outer peripheral wall through the through-hole 4, the amount of polymer solution supplied to the spinning space can be increased in the same manner as the polymer solution supply member 1 in FIG. Thus, the electrospun nonwoven fabric can be produced with higher productivity.

  FIG. 7 shows an outer peripheral wall having a crescent-shaped cross section at the lowest point, and a hollow portion 3 through which the through hole 4 penetrates from the inner peripheral wall. By having such a recessed outer peripheral wall, surface tension is likely to act, and the amount of polymer solution retained increases, so the amount of polymer solution supplied to the spinning space can be increased, and electrostatic spinning with high productivity. Nonwoven fabrics can be manufactured.

  As described above, the cross-sectional shape at the lowest point has been described with reference to FIGS. 2 to 7, but the cross-sectional shape at the highest point can be exactly the same. That is, it can have a cross-sectional shape obtained by rotating the views of FIGS. 2 to 7 by 180 °, and acts exactly the same as the through hole at the lowest point.

  The cross-sectional shape of the hollow tube at the lowest point or the highest point may be the same or different at any lowest point or the highest point, but the distribution of the polymer solution is uniform, and the spinning space It is preferable that the lowermost point or the uppermost point is the same so that the fiber can be efficiently formed by making the supply amount to the surface constant and maintaining the same retention capacity of the polymer solution on the outer peripheral wall. . Further, the cross-sectional shape of the hollow tube other than the lowest point and the highest point is not particularly limited. However, if the inner diameter is locally changed, the pressure loss changes and the distribution of the polymer solution tends to be uneven. The cross-sectional shape is preferably the same as the lower point or the uppermost point. In these drawings, the hollow portion of the hollow tube at the lowermost point or the uppermost point is substantially similar to the shape of the outer peripheral wall, but need not be similar. That is, the thickness of the peripheral wall of the hollow tube does not need to be constant. Further, in FIG. 1, there is a through-hole at each lowest point, but it may have regular through-holes, such as every other, every other, or irregularly. However, it is easier to produce an electrospun nonwoven fabric having a smaller basis weight variation if the lowermost point or the uppermost point has a through-hole or has regular through-holes.

  The polymer solution supply member 1 of the present invention does not need to be in a spiral state, and is a state in which the polymer solution supply member is refracted in a zigzag shape as shown in FIGS. Even if it is a state (FIG. 9) which repeatedly curved to the corrugated shape even if it is FIG. 8), it is the wave shape of this invention. Although not shown, even if it is a sine curve shape, it is the wave shape of the present invention, and even when these are combined, the state of repeating rising and falling when viewed from the side is the wave shape of the present invention. It is a mold shape, regardless of whether it is regular or irregular. However, when producing an electrospun nonwoven fabric with a small basis weight variation, it is preferable that the ascending and descending states are regularly repeated. The “lowest point” means the point where the hollow tube turns from descending to rising, and the “most point” means the point where the hollow tube turns from rising to descending. “Looking from the side” means that when the polymer solution supply member is on the same plane, it is observed from a direction perpendicular to the plane, and is not on the same plane as in a spiral state. Means observation from a direction perpendicular to the axial direction of the polymer solution supply member. In addition, when the polymer solution supply member is in a spiral state, there may be no through hole at the lowest point or the highest point depending on the observation method, but by rotating the polymer solution supply member, The case where the through hole is present is included in the present invention.

  When the polymer solution supply member is viewed from below (when there is a through hole at the lowest point) or when viewed from above (when there is a through hole at the highest point), the through holes are arranged in a straight line. It may be arranged in a circular shape or an oval shape. When the hollow tube 2 is made of a flexible material having a circular shape or an oval shape, the nonwoven fabric having a uniform basis weight is obtained by moving the through hole of the polymer solution supply member 1 in a circular or oval shape. Can be manufactured. Such a flexible hollow tube constituent material is not particularly limited as long as it is not affected by the solvent constituting the polymer solution. For example, perfluoroalkoxy resin, polytetrafluoroethylene, fluoride Fluorine resins such as ethylene propylene and fluoro rubber, polyolefin resins such as polyethylene, polypropylene and copolymer polypropylene, polyamide resins such as 6 nylon and copolymer nylon, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, etc. These resins can be used alone or in combination with a two-layer structure or the like.

  Since the electrospinning apparatus of the present invention includes the polymer solution supply member of the present invention as described above, the polymer solution supply member can be easily replaced or washed, and even if fibers are attached during spinning, it can be easily removed. Moreover, the supply amount of the polymer solution to the spinning space can be increased. Furthermore, the polymer solution supply member has a corrugated shape when viewed from the side, and has a through hole at the lowest point and / or the highest point of the corrugated shape. Since it becomes larger than the other part of the empty tube, the polymer solution can be stably supplied and fiberized. Therefore, it is an apparatus which can manufacture an electrospun nonwoven fabric stably and with good productivity.

  The electrostatic spinning device of the present invention uses the polymer solution supply member of the present invention as described above in place of the conventional polymer solution supply member (for example, a nozzle) so that the through hole faces the collector. It is exactly the same except to do. For example, the polymer solution supply device that can supply the polymer solution to the polymer solution supply member, the polymer solution supply member of the present invention (the lowest point) in which the through holes are arranged to face the collector so that the polymer solution can be supplied to the spinning space. If there is a through-hole, install a collector below, and if there is a through-hole at the uppermost point, install a collector above), collect the fibers that are supplied to the spinning space and stretched by the electric field And an electric field forming device capable of forming an electric field between the polymer solution supplied to the spinning space and the collector. Preferably, in order to prevent dispersion of the solvent of the polymer solution, a spinning container that can store the polymer solution supply member and the collector, a gas supply device that can supply a gas having a predetermined relative humidity to the spinning container so that the fiber diameter can be easily aligned, Alternatively, an exhaust device capable of exhausting the gas in the spinning container is provided. Conventionally, since a metal nozzle was used, it was possible to apply a voltage to the nozzle. However, when the polymer solution supply member of the present invention is made of a nonmetal, the polymer solution supply device and the polymer A polymer solution supply pipe between the solution supply member and / or a metal wire or the like can be installed in the polymer solution supply member to form an electric field between the polymer solution and the collector.

  In addition, the polymer solution supply member is a state in which through holes as shown in FIG. 1 are arranged in a straight line, arranged in one or more rows in the width direction (perpendicular to the traveling direction) of the collector and fixed. Or while reciprocating in the width direction of the collector, the polymer solution can be supplied to the spinning space, and when the through holes are arranged in a circle or oval, the polymer solution supply member is circulated and moved. However, the polymer solution can be supplied to the spinning space. In addition, when the through-hole is arrange | positioned in the ellipse, it is preferable to carry out the circulation movement so that the long diameter may correspond with the width direction of a collector. By doing in this way, the nonwoven fabric with the same fabric weight can be manufactured.

  Since the method for producing an electrospun nonwoven fabric of the present invention is a method of producing using an electrospinning apparatus as described above, the electrospun nonwoven fabric can be produced stably and with high productivity. In addition, since the fiber which comprises an electrospun nonwoven fabric changes with uses of an electrospun nonwoven fabric, by changing the polymer solution to spin, the kind of fiber can be changed and it can be adapted to a use. Examples of polymers constituting the polymer solution include polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer, polyacrylonitrile (PAN), polyacrylonitrile-methacrylate copolymer, polymethyl methacrylate, polyvinyl chloride. , Polyvinylidene chloride-acrylate copolymers, nylons such as polyethylene, polypropylene, nylon 12, nylon-4,6, aramid, polybenzimidazole, polyvinyl alcohol, cellulose, cellulose acetate, cellulose acetate butyrate, polyvinylpyrrolidone-acetic acid Vinyl, poly (bis- (2- (2-methoxy-ethoxyethoxy)) phosphazene) (poly (bis- (2- (2-methoxy-ethyoxy))) ph sphazene); MEEP), polypropylene oxide, polyethylene imide (PEI), polysuccinic acid ethylene (poly (ethylenesuccinate)), polyaniline, polyethylene sulfide, polyoxymethylene-oligo-oxyethylene (poly (oxymethylene-oligo-oxyethylene)), SBS copolymer, polyhydroxybutyric acid, polyvinyl acetate, polyvinyl alcohol (PVA), polyethylene terephthalate, polyethylene oxide, collagen, polylactic acid, polyglycolic acid, poly D, L-lactic acid-glycolic acid copolymer, polyarylate, High biodegradability such as polypropylene fumarate (polypropylene fumarates) and polycaprolactone Various polymers that can be melted or dissolved in an appropriate solvent, such as biopolymers such as polymers, polypeptides, proteins, etc., pitch systems such as coal tar pitch, petroleum pitch, etc. are applicable, and their copolymers and mixtures are also used Is possible. A spinnable sol solution obtained by hydrolyzing a metal alkoxide can also be used. The polymer solution may be mixed with an emulsion such as a synthetic resin or an organic or inorganic powder.

  Examples of the polymer solvent include (a) highly volatile acetone, chloroform, ethanol, isopropanol, methanol, toluene, tetrahydrofuran, water, benzene, benzyl alcohol, 1,4-dioxane, propanol, carbon tetrachloride, cyclohexane, (B) N, N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N, N-dimethylacetamide (DMAc) with relatively low volatility, such as cyclohexanone, methylene chloride, phenol, pyridine, trichloroethane, and acetic acid 1-methyl-2-pyrrolidone (NMP), ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), acetonitrile (AN), N-methylmorpholine-N-oxide, butylene Carbonate (BC), 1,4-butyrolactone (BL), diethyl carbonate (DEC), diethyl ether (DEE), 1,2-dimethoxyethane (DME), 1,3-dimethyl-2-imidazolidinone (DMI) 1,3-dioxolane (DOL), ethyl methyl carbonate (EMC), methyl formate (MF), 3-methyl oxazolidine-2-one (MO), methyl propionate (MP), 2-methyl tetrahydrofuran (MeTHF) ) And sulfolane (SL). The use of the highly volatile solvent or a mixed solvent in which a highly volatile solvent and a solvent having a relatively low volatility are used increases the volatility of the solvent or decreases the viscosity of the polymer solution. The discharge amount from the polymer solution supply member can be increased, and the productivity of the electrospun nonwoven fabric can be improved.

  EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but these do not limit the scope of the present invention.

Example 1
(1) Preparation of spinning stock solution;
A polymer solution (viscosity: 1220 mP · s) in which polyacrylonitrile (registered trademark: Bonnell, manufactured by Mitsubishi Rayon Co., Ltd.) was dissolved in N, N-dimethylformamide to a concentration of 14 mass% was prepared.

(2) Preparation of manufacturing equipment;
The hollow tube 2 made of perfluoroalkoxy resin having an inner diameter of 4 mm and an outer diameter of 6 mm is in a spiral state (outer diameter: 60 mm), and five through-holes 4 having a diameter of 0.2 mm are provided at the lowest point of the hollow tube 2. The polymer solution supply member was arranged (observed from below, with the through holes arranged in a straight line, the distance between adjacent through holes: 60 mm). Note that the cross-sectional shape of the hollow tube 2 was circular in both the hollow portion and the outer peripheral wall at any point (including the lowest point) (same as FIG. 2).

  Next, a micropump (manufactured by Micropump; Micropump FC-513, pump head: 188 1 rpm = 0.17 mL type; controller unit: manufactured by Chuo Rika Co., Ltd., polymer solution supply device) is connected to a polyethylene flexible bag, A perfluoroalkoxy resin tube (with a 0.1 mm diameter stainless steel wire inserted) was connected, and this tube was connected to the polymer solution supply member described above.

  Next, a belt-like collector (width: 500 mm) made of a steel belt coated with conductive silicone rubber was grounded and placed below the polymer solution supply member. Next, a high voltage power source is connected to the gear pump head of the micro pump, the through holes 4 of the polymer solution supply member are opposed to the belt-shaped collector, and the arrangement direction of the through holes 4 is the width direction of the belt-shaped collector ( The polymer solution supply member was arranged so as to coincide with the direction perpendicular to the moving direction. In addition, the distance of the through-hole edge part in an outer peripheral wall and the collection surface of a belt-shaped collection body was 100 mm.

  Next, the polymer solution supply member and the belt-shaped collection body were disposed in the center of a vinyl chloride rectangular parallelepiped spinning container (width: 800 mm, height: 1300 mm, depth: 1800 mm). Inside the rectangular parallelepiped spinning vessel, a vinyl chloride punching plate is placed parallel to the upper wall surface at a position 500 mm below the upper wall surface, and a vinyl chloride punching plate is placed 100 mm above the lower wall surface at the lower wall surface. Placed in parallel. Moreover, the paper tube was arrange | positioned as the winding device at the moving direction end part of the belt-shaped collector. This paper tube was rotated by the movement of the belt-shaped collector, and could wind up the electrospun nonwoven fabric.

  And while connecting the blower (PAU-1400HDR, Apiste Co., Ltd., gas supply apparatus) provided with the temperature / humidity adjustment function to the upper wall surface of the rectangular parallelepiped spinning vessel, an exhaust fan was connected to the lower wall surface of the rectangular parallelepiped spinning vessel.

(3) Production of electrospun nonwoven fabric;
The polymer solution is put into a polyethylene flexible bag, the polymer solution is supplied to the polymer solution supply member using the micropump, and the supplied polymer solution is supplied from each through hole 4 to the spinning space (amount supplied per one). : 5 cc / hour), a voltage of +14 kV is applied to the polymer solution from the high-voltage power source, an electric field is applied to the supplied polymer solution to form fibers, and the fibers are accumulated on the belt-shaped collector to obtain an average fiber. An electrospun nonwoven fabric (weight per unit area: 4.5 g / m ² ) made of continuous fibers having a diameter of 0.36 μm was produced. When producing an electrospun non-woven fabric, humidity control air at a temperature of 25 ° C. and a relative humidity of 25% is supplied from a gas supply device at 5 m ³ / min. Exhausted. In addition, when the polymer solution was supplied to the spinning space and spun, fibers sometimes adhered, but could be easily removed. According to this production method, the electrospun nonwoven fabric could be produced stably with a lower applied voltage than before.

(Comparative Example 1)
A linear stainless steel tube (inner diameter: 4 mm, outer diameter: 6 mm, length: 300 mm), linearly, 5 nozzles at the same interval with a pitch of 60 mm (each stainless steel needle-shaped nozzle with an inner diameter of 0.4 mm) ) Are arranged in a row, and an electrospun non-woven fabric composed of continuous fibers having an average fiber diameter of 0.35 μm is the same as in Example 1 except that this polymer solution supply member was used. The basis weight was 4.5 g / m ² ). In this case, the supply amount of the polymer solution from the nozzle to the spinning space was 3 cc / hour per one, the supply amount was smaller than that in Example 1, and the productivity was inferior. Further, when the polymer solution was supplied to the spinning space and spun, the fibers sometimes adhered to the tip of the nozzle, but it was difficult to remove the fibers.

Diagram of polymer solution supply member seen from the side Cross section at the lowest point of the hollow tube Cross-sectional view at the lowest point of another hollow tube Cross section at the lowest point of yet another hollow tube Cross section at the lowest point of yet another hollow tube Cross section at the lowest point of yet another hollow tube Cross section at the lowest point of yet another hollow tube Conceptual view of another polymer solution supply member seen from the side Conceptual view of another polymer solution supply member seen from the side

Explanation of symbols

1: Polymer solution supply member 2: Hollow tube 3: Hollow portion 4: Through hole 5: Flattening auxiliary material PL1-PL8: Bottom point

Claims (5)

A polymer solution supply member for supplying a polymer solution to a spinning space, which is used in an electrospinning method. The polymer solution supply member has a hollow tube having a hollow portion and has a wave shape when viewed from the side. A polymer solution supply member comprising a through hole penetrating from the inner peripheral wall of the hollow portion to the outer peripheral wall at the lowest point and / or the highest point of the corrugated shape. The polymer solution supply member according to claim 1, wherein a portion of the outer peripheral wall through which the through hole passes is flat or recessed. 3. The polymer solution supply member according to claim 1, wherein the hollow tube is in a spiral state and has a wave shape when viewed from the side. 4. An electrospinning apparatus comprising the polymer solution supply member according to any one of claims 1 to 3. A method for producing an electrospun nonwoven fabric using the electrospinning apparatus according to claim 4.

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