JP2017025428A - Electrospinning device and nanofiber manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrospinning device capable of high-speed stable electrospinning.SOLUTION: An electrospinning device has at least a set of nozzle block unit 250A, which has first and second nozzle blocks 270, 280 on which nozzles 240 discharging polymer solution are two-dimensionally disposed, and a polymer solution tentative holding part 290 that tentatively holds the polymer solution. The first and second nozzle blocks are disposed in a transportation direction a of a long sheet. The first and second nozzle blocks have multiple pipe bodies 271, 281 with end parts on one side that serve as polymer solution inlets 271a, 281a. Polymer solution outlets 293a, 294a are disposed at the polymer solution tentative holding part 290. The polymer solution inlets 271a, 281a and the polymer solution outlets 293a, 294a are connected by a polymer solution distribution pipe 295.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electrospinning apparatus and a nanofiber manufacturing apparatus.

  2. Description of the Related Art Conventionally, a nanofiber manufacturing apparatus that manufactures nanofibers by performing electrospinning with an electrospinning apparatus provided along the conveying direction of a long sheet is known (for example, see Patent Document 1).

FIG. 4 is a front view schematically showing a conventional nanofiber manufacturing apparatus 900.
FIG. 5 is a perspective view showing an essential part of an electrospinning apparatus 920 used in a conventional nanofiber manufacturing apparatus 900. FIG.
In FIGS. 4 and 5, only the components necessary for the description are denoted by reference numerals.

  As shown in FIG. 4, the conventional nanofiber manufacturing apparatus 900 electrospins a long sheet W by discharging a polymer solution onto the long sheet W that is transported along a transport direction a by a transport apparatus 910. An electrospinning device 920 is provided.

  As shown in FIGS. 4 and 5, the electrospinning device 920 (referred to as a conventional electrospinning device 920) is disposed at a position facing the collector 930 and the collector 930, and a plurality of nozzles 940 that discharge the polymer solution. Has a nozzle block 950 that is two-dimensionally arranged, a power supply device 960 that applies a high voltage between the collector 930 and the nozzle block 950, and a polymer solution storage tank 970 that supplies the polymer solution to the nozzle 940. ing.

  As shown in FIG. 5, the nozzle block 950 has a plurality of nozzle blocks (one is a closed end and the other end is a polymer solution inflow port, seven for simplification of the drawing). ) Tube body 980. In each tube body 980, the longitudinal direction of each tube body is arranged along the width direction of the long sheet W (y-y 'direction in FIG. 5). Each tube body 980 and the polymer solution storage tank 970 are connected to each other by a polymer solution circulation pipe 990, and the polymer solution stored in the polymer solution storage tank 970 is distributed to each tube body 980. It is supplied via a pipe 990.

  Each tubular body 980 is detachably attached to the nozzle block 950, and each tubular body 980 has a predetermined number of nozzles 940 along the longitudinal direction of the tubular body for each tubular body. It is attached at a predetermined pitch.

  As described above, in the conventional electrospinning apparatus 920, the nozzle 940 is attached to a plurality of pipes that are arranged in the nozzle block 950 so as to be freely assembled. Therefore, the nozzle 940 is repaired or replaced. When performed, the nozzle can be repaired or replaced in units of tubes. Thereby, the effect that the maintenance of the nozzle 940 can be made easy is obtained.

JP 2012-167408 A

  However, since the conventional electrospinning apparatus 920 has one nozzle block 950 provided in the electrospinning apparatus 920, there is a problem that it is not suitable for mass production of nanofibers at high speed.

  In order to solve such a problem, in the conventional electrospinning apparatus 920, two or more nozzle blocks 950 as shown in FIGS. 4 and 5 may be installed side by side along the conveyance direction a of the long sheet W. In this case, if it is attempted to supply the polymer solution from one polymer solution storage tank 970 to each tube body in each nozzle block 950, the piping of the polymer solution circulation pipe 990 becomes complicated, and the polymer solution Depending on the position of the nozzle block with respect to the storage tank 970, the polymer solution from the polymer solution storage tank 970 may not be evenly and stably supplied to each tube in each nozzle block.

  For this reason, the conventional electrospinning apparatus 920 has a problem that high-speed and stable electrospinning cannot be performed. Therefore, in the conventional nanofiber manufacturing apparatus 900 provided with such a conventional electrospinning apparatus 920, there is a problem that stable quality nanofibers cannot be mass-produced at high speed.

  Accordingly, the present invention aims to provide an electrospinning apparatus capable of performing high speed and stable electrospinning, and also provides a nanofiber manufacturing apparatus capable of mass-producing stable quality nanofibers at high speed. The purpose is to do.

  [1] The electrospinning apparatus of the present invention is an electrospinning apparatus that deposits nanofibers by discharging the polymer solution onto a long sheet that is conveyed in a predetermined conveying direction, facing the collector, and , A first nozzle block and a second nozzle block which are provided along the conveying direction of the long sheet and in which a plurality of nozzles for discharging the polymer solution are two-dimensionally arranged; the first nozzle block and the second nozzle block; A polymer solution temporary storage section that temporarily holds a polymer solution to be supplied to the nozzle block, and the first nozzle block and the second nozzle block each have one end portion of the polymer block. Each of the tubes of the first nozzle block and the tubes of the second nozzle block has a plurality of tubes each serving as a solution inlet. A predetermined number of the nozzles are attached along the longitudinal direction of each tube body, and a polymer solution outlet for supplying the polymer solution to each tube body is provided in the polymer solution temporary storage section. The polymer solution inflow port of each tube body and the polymer solution outflow port of the polymer solution temporary storage part are connected by a polymer solution circulation pipe.

  According to the electrospinning apparatus of the present invention, each nozzle block unit has a first nozzle block and a second nozzle block, and temporarily holds a polymer solution to be supplied to the first nozzle block and the second nozzle block. It has the structure which has a polymer solution temporary storage part. Thus, since the polymer solution temporary storage section is provided for each nozzle block unit, even in an electrospinning apparatus in which a plurality of nozzle blocks are installed along the conveying direction of a long sheet, It is no longer necessary to connect a pipe to each tube body of a large number of nozzle blocks from a single polymer solution storage tank having a capacity.

  As a result, the piping of the polymer solution distribution pipe for supplying the polymer solution to each pipe body of the plurality of nozzle blocks can be made as short and simple as possible, and the pipe bodies can be uniformly and reliably ensured. A polymer solution can be supplied. Thereby, according to the electrospinning apparatus of the present invention, high-speed and stable electrospinning can be performed. In particular, the electrospinning apparatus of the present invention is an electrospinning apparatus suitable for producing thick nanofibers by increasing the amount of nanofibers deposited.

  [2] In the electrospinning apparatus of the present invention, it is preferable that two or more nozzle block units are provided along the conveying direction of the long sheet.

  Thus, since two or more nozzle block units are provided along the conveying direction of the long sheet, at least four nozzle blocks are provided, and therefore, electrospinning can be performed at a higher speed. As a result, the electrospinning apparatus of the present invention is suitable for producing thick nanofibers at high speed and in mass production when producing thick nanofibers.

  In each of the two or more nozzle block units, a polymer solution temporary storage unit is provided for each nozzle block unit. The polymer solution temporary storage section provided for each nozzle block unit is connected to the polymer solution storage tank so that the polymer solution is supplied from the large-capacity polymer solution storage tank, and the polymer solution storage tank After temporarily holding the polymer solution supplied from, it is supplied to each corresponding tube.

  [3] In the electrospinning apparatus of the present invention, the pipes flow into the pipes from the polymer solution inlets on the side opposite to the ends that are the polymer solution inlets of the pipes. It is preferable that a polymer solution outflow hole is provided for allowing the polymer solution to flow out of each tube body.

  Thus, by providing the polymer solution outflow hole on the side of the end opposite to the end that is each polymer solution inlet of each tube (also referred to as the end of each tube), In each tube, the polymer solution is circulated in a filled state, and the polymer solution is uniformly and reliably supplied from the polymer solution temporary storage portion to each tube, and provided in each tube. Thus, the polymer solution is uniformly and reliably supplied to each nozzle. Thereby, each nozzle can discharge a polymer solution with a stable discharge amount.

  [4] The electrospinning apparatus of the present invention preferably has a polymer solution recovery apparatus for recovering the polymer solution flowing out from the polymer solution outflow hole.

  By having such a polymer solution recovery device, the polymer solution flowing out from the polymer solution outflow hole of each tubular body can be recovered and reused as a raw material for nanofibers. For example, after the recovered polymer solution is transferred to the regeneration tank of the polymer solution recovery device, the composition of the recovered polymer solution is measured, and a solvent or other necessary components are added to the polymer solution according to the measurement result. By doing so, it becomes possible to regenerate the recovered polymer solution into a polymer solution having the same or very close composition as the original polymer solution.

  [5] In the electrospinning apparatus according to the present invention, each tube body of the first nozzle block and each tube body of the second nozzle block has a longitudinal direction of the tube body along a conveying direction of the long sheet. As described above, the polymer solution inlets in the pipes of the first nozzle block and the polymer solution inlets in the pipes of the second nozzle block face each other in the width direction of the long sheet. The polymer solution temporary storage part is provided between the first nozzle block and the second nozzle block, and faces the first nozzle block among the side surfaces of the polymer solution temporary storage part. On the side surface of the first nozzle block, a polymer solution outlet corresponding to each polymer solution inlet of each tube in the first nozzle block is provided, and the second nozzle block includes A polymer solution outlet corresponding to each polymer solution inlet of each tube in the second nozzle block is provided on the side surface facing the second nozzle block, and each polymer solution outlet of the polymer solution temporary storage section; The polymer solution inlet in each tube of the first nozzle block and the polymer solution inlet in each tube of the second nozzle block are preferably connected by the polymer solution circulation pipe. .

  By adopting such a configuration, it is possible to shorten and simplify the piping of the polymer solution circulation pipe for supplying the polymer solution to each tube body of the first nozzle block and each tube body of the second nozzle block. . Thereby, the polymer solution can be uniformly and reliably supplied to each tube of the first nozzle block and each tube of the second nozzle block.

  [6] In the electrospinning apparatus of the present invention, each tube body of the first nozzle block and each tube body of the second nozzle block has a longitudinal direction of each tube body along a width direction of the long sheet. In this way, the long sheet is arranged in the conveying direction of the long sheet, and each polymer solution inlet in each tube of the first nozzle block and each polymer solution inlet in each tube of the second nozzle block The polymer solution temporary storage portions are provided in a line so as to be along the transport direction, and the polymer solution temporary storage portions are provided in the polymer solution inflow ports in the tubes of the first nozzle block and the polymer solution flows in the tubes of the second nozzle block. The first nozzle block and the second nozzle block of the side surface of the polymer solution temporary storage unit are provided so as to face the inlet and along the conveying direction of the long sheet. A polymer solution outlet corresponding to each polymer solution inlet of each tube in the first nozzle block and the second nozzle block is provided on a side surface of each tube opposite to each polymer solution inlet. The polymer solution circulation pipe is provided between each polymer solution outlet of the polymer solution temporary storage section and each polymer solution inlet of each tube body of the first nozzle block and the second nozzle block. It is also preferable that they are connected by

  Even with such a configuration, the piping of the polymer solution circulation pipe for supplying the polymer solution to each tube body of the first nozzle block and each tube body of the second nozzle block can be shortened and simplified. it can. Thereby, the polymer solution can be uniformly and reliably supplied to each tube of the first nozzle block and each tube of the second nozzle block.

  [7] In the electrospinning apparatus of the present invention, the polymer solution temporary storage unit includes the polymer solution outlets of the polymer solution temporary storage unit, the polymer solution inlets of the tubes of the first nozzle block, and the polymer solution temporary storage unit. It is preferable that the second nozzle block is provided so as to be higher in the direction of gravity than each polymer solution inlet in each tube body.

  By setting it as such a structure, the polymer solution currently hold | maintained at the polymer solution temporary storage part can be supplied with respect to each pipe body of a 1st nozzle block and a 2nd nozzle block with a predetermined | prescribed pressure.

[8] The electrospinning apparatus of the present invention further includes a reciprocating drive unit that reciprocates the first nozzle block and the second nozzle block in a predetermined cycle along the width direction of the long sheet, and the polymer It is preferable that the solution distribution pipe has flexibility.
It is preferable to do.

  Thereby, a 1st nozzle block and a 2nd nozzle block can be reciprocated in the state which fixed the polymer solution temporary storage part. When the second nozzle block is reciprocated, if the reciprocating cycle is controlled to be an appropriate cycle, the discharge position of each nozzle is set to the other nozzles with respect to the long sheet conveyed in the conveying direction. It is possible to avoid overlapping with the discharge positions as much as possible. Thereby, the uniformity of the deposition amount of the nanofibers in the long sheet can be enhanced.

  [9] In the electrospinning apparatus of the present invention, the reciprocating motions of the first nozzle block and the second nozzle block when the first nozzle block and the second nozzle block are reciprocated at a predetermined cycle are adjacent to each other. It is preferable that the nozzle blocks are set in opposite directions.

  The first nozzle block and the second nozzle block reciprocate in this manner, so that the uniformity of the nanofiber deposition amount on the long sheet can be improved.

  [10] The electrospinning apparatus of the present invention preferably further includes an interval adjustment drive unit that allows adjustment of the interval between the first nozzle block and the second nozzle block and the collector.

  Thereby, the space | interval of a 1st nozzle block and a 2nd nozzle block, and a collector can be adjusted. In this case, if the distance between the first nozzle block and the second nozzle block and the collector is adjusted to an optimum distance before the electrospinning is started, the distance between the first nozzle block and the second nozzle block and the collector is adjusted. Electrospinning can be performed in a state where is optimally set. The intervals between the first nozzle block and the second nozzle block and the collector should be determined in consideration of the spinning conditions of the electrospinning apparatus, the type of polymer solution, the average diameter of the nanofibers, the thickness of the nanofiber nonwoven fabric, and the like. Can do.

  [11] A nanofiber manufacturing apparatus of the present invention includes a transport device that transports a long sheet in a predetermined transport direction, and an electrospinning device that electrospins the long sheet that is transported in the predetermined transport direction. A nanofiber manufacturing apparatus, wherein the electrospinning apparatus is the electrospinning apparatus according to any one of [1] to [10].

  According to the nanofiber production apparatus of the present invention, since the electrospinning apparatus according to any one of [1] to [10] is provided as an electrospinning apparatus, it is possible to mass-produce stable quality nanofibers at high speed. it can. In particular, the nanofiber production apparatus of the present invention can be a nanofiber production apparatus suitable for producing thick nanofibers by increasing the deposition amount of nanofibers.

It is a figure shown in order to demonstrate the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1. FIG. It is a top view which takes out and shows one nozzle block unit 250A among the several nozzle block units 250A-250D provided in the electrospinning apparatus 10 which concerns on Embodiment 1. FIG. It is a top view which takes out and shows one nozzle block of nozzle block units 250A-250D provided in the electrospinning apparatus 20 according to the second embodiment. It is a front view which shows the conventional nanofiber manufacturing apparatus 900 typically. It is a perspective view which takes out and shows the principal part of the electrospinning apparatus 920 used for the conventional nanofiber manufacturing apparatus 900.

  Hereinafter, the electrospinning apparatus and the nanofiber manufacturing apparatus of the present invention will be described based on the embodiments shown in the drawings.

  FIG. 1 is a view for explaining the nanofiber manufacturing apparatus 1 according to the first embodiment. FIG. 1 is a front view of the nanofiber manufacturing apparatus 1. In addition, in FIG. 1, illustration about components other than the component required in order to demonstrate the nanofiber manufacturing apparatus 1 which concerns on 1st Embodiment is abbreviate | omitted. In addition, in FIG. 1A, some of the components are shown in a cross-sectional view.

  As shown in FIG. 1, the nanofiber manufacturing apparatus 1 according to the first embodiment includes a conveyance device 100 that conveys a long sheet W in a predetermined conveyance direction a, and a long sheet that is conveyed along the conveyance direction a. An electrospinning apparatus 10 that electrospins W, and each operation unit (described later) of the transport apparatus 100 and a control device 300 that controls each operation unit (described later) of the electrospinning apparatus 10 are provided.

  As shown in FIG. 1, the conveyance device 100 includes a supply roller 101 that supplies a long sheet W before electrospinning, and a long sheet (a nanofiber is deposited by depositing nanofibers by the electrospinning device 10). A take-up roller 102 for taking up a long sheet W ′ or simply a long sheet W ′.

  In addition to the supply roller 101 and the take-up roller 102, the transport device 100 includes an auxiliary roller disposed between the supply roller 101 and the take-up roller 102, a long sheet W before electrospinning, and Various components such as a tension roller for applying a predetermined tension to the long sheet W ′ on which nanofibers are deposited and a heating device for heating the long sheet W ′ on which nanofibers are deposited are provided. Is not shown.

  Next, the electrospinning apparatus 10 according to the first embodiment will be described. As shown in FIG. 1, the electrospinning apparatus 10 according to Embodiment 1 includes a collector 230 attached to a housing (not shown) of the electrospinning apparatus 10 via an insulating member (not shown), A power supply that applies a predetermined high voltage between a plurality (four) of nozzle block units 250A, 250B, 250C, and 250D provided at a position facing the collector 230 and between the collector 230 and a nozzle 240 described later. Device 260.

  Details of the nozzle block units 250A, 250B, 250C, and 250D will be described later. When these nozzle block units 250A, 250B, 250C, and 250D are collectively described, they may be expressed as nozzle block units 250A to 250D.

  The collector 230 and the power supply device 260 are provided corresponding to the nozzle block units 250A to 250D, respectively. The collectors corresponding to the nozzle block units 250A to 250D are collectors 230A, 230B, 230C, and 230D. The power supply devices corresponding to the nozzle block units 250A to 250D are referred to as power supply devices 260A, 260B, 260C, 260, 260D.

Next, the plurality of nozzle block units 250A to 250D will be described.
The nozzle block units 250A to 250D are installed in a line along the conveying direction a of the long sheet W. In FIG. 1, the nozzle block units 250A, 250B, 250C, and 250D are arranged from the left side of the drawing. It is installed in the order.

  FIG. 2 is a plan view showing one nozzle block extracted from the nozzle block units 250A to 250D provided in the electrospinning apparatus 10 according to the first embodiment. Since the nozzle block units 250A to 250D have the same configuration, the nozzle block unit 250A will be described here with reference to FIG. 2A is a plan view of the nozzle block unit 250A, and FIG. 2B shows the nozzle block unit 250A shown in FIG. 2A in the width direction of the long sheet W (direction along the y-axis). FIG.

  As shown in FIG. 2, the nozzle block unit 250A is provided between the first nozzle block 270, the second nozzle block 280, and the first nozzle block 270 and the second nozzle block 280. 270 and the second nozzle block 280 have a polymer solution temporary storage unit 290 that temporarily holds the polymer solution to be supplied. When the first nozzle block 270 and the second nozzle block 280 are collectively described, they may be expressed as nozzle blocks 270 and 280.

  The first nozzle block 270 has a plurality of tube bodies 271 (seven for simplification of the drawing) whose one end is a polymer solution inlet 271a. Each tubular body 271 is arranged in the first nozzle block in a state in which the longitudinal direction of each tubular body 271 is aligned in the width direction of the long sheet W such that the longitudinal direction of the tubular body 271 is along the conveyance direction a (direction along the x axis) 270. Each tubular body 271 is detachably attached to the first nozzle block 270.

  A predetermined number of nozzles 240 are attached to these tubular bodies 271 at predetermined pitches along the longitudinal direction of the tubular bodies for each tubular body 271. Thus, when a predetermined number of nozzles are attached to each tube body 271, when the first nozzle block 270 is viewed in plan as shown in FIG. 2A, a large number of nozzles are two-dimensionally arranged in a matrix. It has become a state.

  Similarly to the first nozzle block 2270, the second nozzle block 280 also has a plurality of pipe bodies (in this case, seven pipes are also used for simplification of the drawing) in which one end is a polymer solution inlet 281a. 281. Each tubular body 281 is a second nozzle block in a state where the longitudinal direction of each tubular body 281 is aligned in the width direction of the long sheet W such that the longitudinal direction of the tubular body 281 is along the conveyance direction a (direction along the x axis) of the long sheet W. 280. Each tube body 281 is also detachably attached to the second nozzle block 280. Further, similarly to the first nozzle block 2270, a large number of nozzles 240 are attached to these pipe bodies 281 along the longitudinal direction of the pipe bodies at every predetermined pitch.

  By the way, on the end side of each tube 271 in the first nozzle block 270 (on the side opposite to the end that is the polymer solution inlet 271a), the tube from the polymer solution inlet 271a. A polymer solution outflow hole 271b (see FIG. 2B) for allowing the polymer solution flowing into the 271 to flow out is provided. The polymer solution outflow hole 271b has an inner diameter that allows the polymer solution supplied from the polymer solution temporary storage unit 290 to each tube 271 to be gradually discharged after being filled in each tube. .

  Similarly, each pipe body 281 in the second nozzle block has a polymer solution flow on each terminal end side (the end side opposite to the end portion that is the polymer solution inlet 281a) of each pipe body 281. A polymer solution outflow hole 281b (see FIG. 2B) for allowing the polymer solution that has flowed into the tube body 281 from the inlet 281a to flow out is provided. Similarly to the polymer solution outflow hole 271b, the polymer solution outflow hole 281b can be gradually discharged after the polymer solution supplied from the polymer solution temporary storage unit 290 to each tube body 281 is filled in each tube body. The inner diameter is as large as possible.

  As described above, the polymer solution outflow hole 271b is provided on the end portion side of each tube body 271 of the first nozzle block 270, and the polymer solution is provided on the end portion side of each tube body 281 of the second nozzle block 280. By providing the outflow hole 281b, the polymer solution supplied from the polymer solution temporary storage unit 290 is filled in each tube body 271 of the first nozzle block 270 and each tube body 281 of the second nozzle block 280. It will be distributed in the state that was done.

  As a result, the polymer solution is uniformly and stably supplied from the polymer solution temporary storage unit 290 to each tube body 271 of the first nozzle block 270 and each tube body 281 of the second nozzle block 280. In addition, the polymer solution is uniformly and reliably supplied to each nozzle 240 provided in each tube 281. Accordingly, each nozzle 240 can discharge the polymer solution with a stable discharge amount. When the tube bodies 271 of the first nozzle block 270 and the tube bodies 281 of the second nozzle block 280 are collectively described, they may be referred to as tube bodies 271 and 281, respectively.

  By the way, the pipe bodies 271 and 281 of the first nozzle block 270 and the second nozzle block 280 are made of conductive members such as copper, stainless steel, and aluminum, for example, and the nozzle 240 is electrically connected to the pipe body 271. It is attached to the tube body 271 in the state.

  In addition, the polymer solution temporary storage unit 290 is connected to the large-capacity polymer solution storage tank 400, and after temporarily holding the polymer solution supplied from the polymer solution storage tank 400, the polymer bodies 271 and 281 To supply. The polymer solution storage tank 400 stores an amount of polymer solution that can supply the polymer solution to each of the polymer solution temporary storage units 290 of the nozzle block units 250A to 250D. When the polymer solution from the polymer solution storage tank 400 is supplied to the polymer solution temporary storage unit 290, the polymer solution is supplied to the polymer solution temporary storage unit 290 in a state where a predetermined pressure is applied.

  In the electric field prevention device 10 according to the first embodiment, the polymer solution temporary storage unit 290 has a cylindrical shape whose surface shape is, for example, a quadrangle when viewed from the direction along the y-axis. In addition, the length L1 along the y-axis of the polymer solution temporary storage unit 290 is approximately the same as the length L2 along the y-axis of the first nozzle block 270 and the second nozzle block 280. In addition, the shape of the surface when the polymer solution temporary storage part 290 is seen from the direction along the y-axis is not limited to a quadrangle, and may be a circle or an ellipse, or along the y-axis. The length L1 may be slightly longer or slightly shorter than the length L2 along the y-axis of the first nozzle block 270 and the second nozzle block 280.

  In addition, the polymer solution temporary storage unit 290 is located near each lower end of each side surface of the polymer solution temporary storage unit 290 (side surfaces 291 and 292 on the side facing the first nozzle block 270 and the second nozzle block 280). The polymer solution outlets 293a and 294a corresponding to the polymer solution inlets 271a and 281a in the pipes 271 and 281 are provided.

  Specifically, the side surface 291 of each side surface of the polymer solution temporary storage unit 290 that faces the first nozzle block 270 is connected to each polymer solution inlet 271a in each tube body 271 of the first nozzle block 270. Seven corresponding polymer solution outlets 293a are provided, and each side surface 292 of each side surface of the polymer solution temporary storage unit 290 facing the second nozzle block 280 is provided with each of the second nozzle block 280. Seven polymer solution outlets 294a corresponding to the polymer solution inlets 281a in the pipe body 281 are provided.

  The seven polymer solution outlets 293a and the polymer solution inlets 271a of the corresponding pipe bodies 271 are connected by the polymer solution distribution pipe 295, and correspond to the seven polymer solution outlets 294a, respectively. The polymer solution inflow pipe 295 is also connected to the polymer solution inlet 281a of the pipe body 281 to be connected. These polymer solution distribution pipes 295 are made of a soft material. For this reason, the polymer solution distribution pipe 295 has flexibility.

  Moreover, the polymer solution temporary storage part 290 is installed in the state fixed to the base part 297 (refer FIG.2 (b)). At this time, the height H1 of the polymer solution temporary storage unit 290 in the vertical direction (the direction along the z-axis) is such that the upper surface of the polymer solution temporary storage unit 290 is positioned above the polymer solution temporary storage unit 290. The height is set so as not to contact the sheet W (see FIG. 1).

  Thus, when the polymer solution temporary storage part 290 is installed, the polymer solution outflow port 293a and the polymer solution outflow port 294a in the vertical direction position (position along the z-axis) P1 are the polymer solution of the tubular body 271. The position is set to be higher than the vertical position (position along the z-axis) P0 of the inlet 271a and the polymer solution inlet 281a of the pipe body 281. As a result, the polymer solution held in the polymer solution temporary storage unit 290 is supplied to each of the tubes 271 and 281 with a predetermined pressure.

  The vertical position P1 of the polymer solution outlet 293a and the polymer solution outlet 294a is preferably several tens mm or more higher than the vertical position P0 of the polymer solution inlet 281a, and if possible, 100 mm or more. More preferably.

  As shown in FIG. 1, the first nozzle block 270 and the second nozzle block 280 in the nozzle block unit 250A configured as described above are installed so as to discharge the polymer solution upward from the discharge ports of the respective nozzles 240. ing. Then, the polymer solution held in the polymer solution temporary storage unit 290 is supplied to each tube body 271 and 281 by the polymer solution circulation pipe 295, and the polymer solution supplied to each tube body 271 and 281 has a predetermined pressure. The polymer solution is discharged from the discharge port of each nozzle 240 while flowing through the pipes 271 and 281 in the state of being held, thereby causing the long sheet W to be electrospun and the long sheet W to be electrospun. To deposit nanofibers.

  In addition, among the polymer solutions supplied into the pipes 271 and 281, the polymer solution remaining without being discharged from the nozzle 240 flows through the pipes 271 and 281, and then is stored in the pipes 271 and 281. The polymer solution flows out from the polymer solution outflow holes 271b and 281b provided on the end portion side, and is temporarily stored in the nozzle blocks 270 and 280.

  Here, the nozzle blocks 270 and 280 can store the polymer solution overflowing from the nozzle 240 and the polymer solution flowing out of the pipes 271 and 281 from the polymer solution outlet holes 271b and 281b of the pipes 271 and 281, respectively. The container blocks 270 and 280 are provided with polymer solution outlets 275 and 285 (see FIG. 2B) for discharging the polymer solution. The polymer solution discharge ports 275 and 285 are connected to a polymer solution discharge pipe (not shown). In addition, it is preferable that the bottom surfaces of the nozzle blocks 270 and 280 have an inclined surface that forms a downward slope toward the polymer solution outlets 275 and 285.

  The polymer solution discharged from the polymer solution discharge ports 275 and 285 is recovered by a polymer solution recovery device (not shown), and then the recovered polymer solution can be reused as a raw material for nanofibers. It is.

  Further, as shown in FIG. 2, each nozzle block 270, 280 is used in a state where the upper end opening surface is covered with lids 276, 286. The lid bodies 276 and 286 are provided with nozzle through holes (reference numerals are omitted) for projecting the nozzles 240 upward corresponding to the nozzles 240.

  Although the nozzle block unit 250A has been described with reference to FIG. 2, the other nozzle block units 250B to 250D have the same configuration.

  Each of the nozzle block units 250A to 250D configured as described above can reciprocate in the width direction of the long sheet W (the direction along the y axis in FIG. 2) for each nozzle block unit. 2 is movable in the vertical direction along the z-axis in FIG.

  The nozzle block unit 250A will be specifically described as an example. The first nozzle block 270 of the nozzle block unit 250A is moved in the width direction of the long sheet W (y in FIG. 2) by a reciprocating drive unit (not shown). And can be moved up and down along the z-axis in FIG. 2 (the distance from the collector 230A can be adjusted) by a distance adjustment drive unit (not shown). It has become.

The second nozzle block 280 of the nozzle block unit 250A can also reciprocate in the width direction of the long sheet W (the direction along the y axis in FIG. 2) by a reciprocating drive unit (not shown). At the same time, it can be moved up and down in the direction along the z-axis in FIG.
Each of these reciprocating drive units and the interval adjusting drive unit is controlled by a control device 300 (see FIG. 1). Note that the control device 300 also controls the power supply devices 260A to 260D.

  Each nozzle block 270, 280 performs a reciprocating motion along the y-axis or a vertical motion along the z-axis only with the nozzle block 270, 280 in a state where the polymer solution temporary storage unit 290 is fixed. Thus, only the nozzle blocks 270 and 280 can reciprocate or move up and down while the polymer solution temporary storage unit 290 is fixed because the polymer solution distribution pipe 295 has flexibility. is there.

  A mechanism for reciprocating the nozzle blocks 270 and 280 in the direction along the y-axis and a mechanism for moving the nozzle blocks 270 and 280 up and down in the direction along the z-axis (with the collectors 230A to 230D). As the mechanism for adjusting the interval), a known mechanism can be used, and therefore, the specific structure and the like of each of these mechanisms are not shown or described.

  Further, the reciprocating motion in the direction along the y-axis of the nozzle blocks 270 and 280 of the nozzle block units 250A to 250D is set to be opposite to each other in adjacent nozzle blocks.

  For example, the first nozzle block 270 and the second nozzle block 280 in the nozzle block unit 250A will be described as an example. When the first nozzle block 270 moves in the arrow y direction in FIG. When the nozzle block 280 moves in the direction of the arrow y ′ in FIG. 2A and the first nozzle block 270 moves in the direction of the arrow y ′ in FIG. 2A, the second nozzle block 280 moves in the direction of the arrow y ′ in FIG. ) In the arrow y direction.

  Such reciprocating motion is the same in the first nozzle block 270 and the second nozzle block 280 in the other nozzle block units 250B to 250D. It is preferable that all adjacent nozzle blocks move in the opposite directions.

  Therefore, for example, when the second nozzle block 280 of the nozzle block unit 250A moves in the direction of arrow y in FIG. 2A, the first nozzle block 270 of the nozzle block unit 250B moves to the arrow y in FIG. 'Move in the direction. Further, when the second nozzle block 280 of the nozzle block unit 250A moves in the direction of the arrow y ′ in FIG. 2A, the first nozzle block 270 of the nozzle block unit 250B moves in the direction of the arrow y in FIG. Moving.

  As described above, the nozzle blocks 270 and 280 of the nozzle block units 250A to 250D are moved in the opposite directions to each other, so that the nozzle blocks 270 and 280 of the nozzle block units 250A to 250D are arranged as a whole. When viewed in a plan view, a total of eight nozzle blocks 270 and 280 of the nozzle block units 250A to 250D are alternately moved in a zigzag manner.

  By the way, although the power supply devices 260A to 260D give a predetermined voltage between the collectors 230A to 230D and each nozzle 240, in the electrospinning device 10 according to the first embodiment, each of the power supply devices 260A to 260D. One electrode (referred to as a positive electrode) is connected to the corresponding collector 230A to 230D, and the other electrode (referred to as a negative electrode) is not the nozzle 240 but the first nozzle in each nozzle block unit 250A to 350D. The pipes 271 and 281 of the block 270 and the second nozzle block 280 are connected.

  That is, each nozzle 240 side, that is, the tube bodies 271 and 281 side is set to the ground potential. In FIG. 1, connection lines for electrically connecting the positive electrodes of the power supply devices 260A to 260D and the collectors 230A to 230D, the negative electrodes of the power supply devices 260A to 260D, and the tubes 271 and 281 The connection lines for electrically connecting the two are not shown.

  Each nozzle block 270, 280 is made of a conductive member, and the first nozzle block 270 and each tube body 271 are electrically connected, and the second nozzle block 280 and each tube body 281 are connected. As long as it is in an electrically connected state, the negative electrodes of the power supply devices 260A to 260D may be connected to the nozzle blocks 270 and 280 of the nozzle block units 250A to 250D. Moreover, if each nozzle block 270,280 and the housing | casing (not shown) of the electrospinning apparatus 10 are in the state electrically connected, each negative electrode of each power supply device 260A-260D will be an electrospinning apparatus. You may make it connect to ten housings. In either case, it is preferable that the nozzle 240 side be at ground potential.

  In this way, by setting the nozzle 240 side to the ground potential, the nozzle 240, the tube bodies 271 and 281, the nozzle blocks 270 and 280, and the casing of the electrospinning apparatus 10 are discharged from the nozzle 240. All of the polymer solution and the polymer solution temporary storage unit 290 before being grounded are at ground potential. Thereby, it is possible to ensure the safety of the operator who operates the electrospinning apparatus 10 and the nanofiber manufacturing apparatus 1, and it is not necessary to make the polymer solution temporary storage unit 290 and the like have a high pressure resistance specification.

  Hereinafter, the method of manufacturing a nanofiber nonwoven fabric using the nanofiber manufacturing apparatus 1 according to the first embodiment configured as described above will be described.

  First, the long sheet W is set on the conveying apparatus 100, and then the long sheet W is wound by the winding roller 102 while being fed from the supply roller, thereby being conveyed at a predetermined conveying speed. And in the electrospinning apparatus 10, a polymer solution is discharged to the elongate sheet | seat W from each nozzle 240 attached to each tube body 271 and 281 of each nozzle block 270 and 280 in each nozzle block unit 250A-250D. Thus, nanofibers are sequentially deposited on the long sheet W.

  In addition, before starting such an operation | movement, the space | interval of collector 230A-230D and each nozzle block 270,280 can be adjusted to an optimal space | interval by a corresponding space | interval adjustment drive part, respectively. The intervals between the collectors 230A to 230D and the nozzle blocks 270 and 280 are determined in consideration of the spinning conditions of the electrospinning apparatus 10, the type of polymer solution, the average diameter of the nanofibers, the thickness of the nanofiber nonwoven fabric to be manufactured, and the like. can do. As a result, electrospinning can be performed in a state where the intervals between the collectors 230A to 230D and the nozzle blocks 270 and 280 are optimally set.

  Further, when performing the operation of sequentially depositing nanofibers on the long sheet W, the long sheet is moved while the nozzle blocks 270 and 280 are reciprocated in the width direction of the long sheet W by the corresponding reciprocating drive units. An operation of discharging the polymer solution to W is performed.

  The reciprocating cycle of the first nozzle block 270 and the second nozzle block 280 by each reciprocating drive unit is set based on the arrangement pitch of the nozzles 240, the conveying speed of the long sheet W, and the like. For example, the reciprocating cycle is set so that the discharge position of each nozzle 240 in one adjacent nozzle block is not overlapped with the discharge position of the other adjacent nozzle as much as possible for the long sheet W being conveyed in the conveyance direction a. To do. Thereby, the uniformity of the deposition amount of the nanofibers in the long sheet W can be enhanced.

  In this manner, by depositing nanofibers on the long sheet W, a long sheet W ′ on which nanofibers are deposited is generated. Then, the long sheet W ′ on which the nanofibers are deposited is heated by a heating device (not shown). The long sheet W ′ heated by a heating device may be referred to as a nanofiber nonwoven fabric.

  In the nanofiber manufacturing apparatus 1 according to the first embodiment, four nozzle block units 250A to 250D are arranged in parallel along the conveyance direction a of the long sheet W, and each nozzle block unit 250A to 250D has a long length. Two nozzle blocks 270 and 280 are arranged in parallel along the conveyance direction a of the long sheet W. For this reason, stable quality nanofibers can be mass-produced at high speed. In particular, it is suitable for producing thick nanofibers by increasing the amount of deposited nanofibers.

  Here, the spinning conditions in the nanofiber manufacturing apparatus 1 according to the first embodiment are exemplarily shown. As the long sheet W, nonwoven fabrics, woven fabrics, knitted fabrics and the like made of various materials can be used.

  Examples of the polymer used as a raw material for the nanofiber include polylactic acid (PLA), polypropylene (PP), polyvinyl acetate (PVAc), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), Polyamide (PA), polyurethane (PU), polyvinyl alcohol (PVA), polyacrylonitrile (PAN), polyetherimide (PEI), polycaprolactone (PCL), polylactic glycolic acid (PLGA), polyvinylidene fluoride (PVDF), Silk, cellulose, chitosan and the like can be used.

  Examples of the solvent used for the polymer solution include dichloromethane, dimethylformamide, dimethyl sulfoxide, methyl ethyl ketone, chloroform, acetone, water, formic acid, acetic acid, cyclohexane, THF, decahydronaphthalene (Decalin), dimethylformamide (DMAc), and the like. Can do. A plurality of types of solvents may be mixed and used. The polymer solution may contain an additive such as a conductivity improver.

  By the way, when the electrospinning is performed in the electrospinning apparatus 10, the polymer solution overflowed from each nozzle 240 and the inside of each pipe body 271, 281 circulate through the polymer solution outflow holes 271 b, 281 b of each pipe body 271, 281. The polymer solution that has flowed out is collected at the bottom of each nozzle block 270, 280 and then discharged from each nozzle block 270, 280 through the polymer solution outlet 275, 285.

  At this time, if a polymer solution recovery device (not shown) is provided in the electrospinning device 10, the discharged polymer solution can be recovered and reused as a raw material for nanofibers. For example, after the recovered polymer solution is transferred to the regeneration tank of the polymer solution recovery device, the composition of the recovered polymer solution is measured, and a solvent or other necessary components are added to the polymer solution according to the measurement result. By performing, it becomes possible to regenerate the recovered polymer solution into a polymer solution having the same or very close composition as the original polymer solution (polymer solution stored in the polymer solution storage tank 400).

  Next, effects of the nanofiber manufacturing apparatus 1 according to the first embodiment and the electrospinning apparatus 10 according to the first embodiment will be described. First, the effect of the electrospinning apparatus 10 according to the first embodiment will be described.

  In the electrospinning apparatus 10 according to the first embodiment, the polymer solution temporary storage unit 290 is provided for each of the nozzle block units 250A to 250D, and the polymer solution temporary storage unit 290 provided for each of the nozzle block units 250A to 250D. The polymer solution is supplied to the pipe bodies 271 and 281 of the nozzle blocks 270 and 280 of the nozzle block unit.

  For this reason, even in an electrospinning apparatus in which a large number of nozzle blocks are installed along the conveying direction of a long sheet, each tube body of the large number of nozzle blocks from one large-capacity polymer solution storage tank 400 It is not necessary to connect a polymer solution distribution pipe to the pipe. As a result, the pipes of the polymer solution circulation pipes for supplying the polymer solution to the pipe bodies 271 and 281 of the nozzle blocks 270 and 280 can be made as short and simple as possible. The polymer solution can be supplied to 281 evenly and stably.

  In the electrospinning apparatus 10 according to the first embodiment, polymer solution outflow holes 271b and 281b are provided on the end portions of the tube bodies 271 and 281 in the nozzle blocks 270 and 280, respectively. As a result, each tube 271 and 281 circulates in a polymer-filled state in which the polymer solution is filled, and the polymer solution temporary storage unit 290 uniformly and stably supplies the polymer to each tube 271 and 281. As the solution is supplied, the polymer solution is uniformly and reliably supplied to the nozzles 240 provided in the pipes 271 and 281. Thereby, each nozzle 240 can discharge a polymer solution with a stable discharge amount.

  Moreover, since the electrospinning apparatus 10 according to the first embodiment enables the nozzle blocks 270 and 280 to reciprocate at a predetermined cycle for each nozzle block along the width direction of the long sheet W, the long sheet W It is possible to improve the uniformity of the deposited amount of nanofibers. Further, since the intervals between the nozzle blocks 270 and 280 and the collectors 230A to 230D corresponding to the nozzle blocks can be adjusted for each nozzle block, it is possible to perform electrospinning under optimum conditions.

  According to the electrospinning apparatus 10 according to Embodiment 1 configured as described above, high-speed and stable electrospinning can be performed. In particular, the electrospinning apparatus 10 according to the first embodiment is an electrospinning apparatus suitable for producing thick nanofibers by increasing the amount of nanofibers deposited.

  Further, in the electrospinning apparatus 10 according to the first embodiment, the polymer solution overflowed from each nozzle 240 and the polymer solution flowing through the tube bodies 271 and 281 and flowing out from the polymer solution outflow holes 271b and 281b of the tube bodies. To collect. Therefore, the polymer solution overflowed from each nozzle 240 and the polymer solution flowing through the tube bodies 271 and 281 and flowing out from the polymer solution outflow holes 271b and 281b of each tube can be reused as the raw material of the nanofiber. it can.

  In the electrospinning apparatus 10 according to the first embodiment, collectors 230A to 230D and power supply apparatuses 260A to 260D are provided corresponding to the nozzle block units 250A to 250D. The power supply devices 260 </ b> A to 260 </ b> D can be controlled by the control device 300. For this reason, for example, when some trouble occurs in one nozzle block unit, the power supply of only the power supply device corresponding to the nozzle block unit in which the trouble has occurred is shut off, and other normal nozzle block units are used. Electrospinning can be continued as it is. Thereby, according to the electrospinning apparatus 10 which concerns on Embodiment 1, even if a malfunction arises in a certain nozzle block unit, since an electrospinning operation can be continued, production capacity of nanofibers can be greatly reduced. Disappear.

  It is also possible to appropriately set the magnitude of power supplied to each nozzle block unit. Accordingly, for example, as described above, when a problem occurs in a certain nozzle block unit, power is supplied to other normal nozzle block units so that electrospinning can be performed with higher capability. It is also possible. By doing in this way, even when a malfunction occurs in a certain nozzle block unit, the normal production capacity can be maintained.

  In the electrospinning apparatus 10 according to the first embodiment, the power supply devices 260A to 260D are provided corresponding to the nozzle block units 250A to 250D, but the power supply device is common to the nozzle block units 250A to 250D. A power switch that can supply / shut off power is interposed between the positive electrode of each power supply apparatus and each of the collectors 230A to 230D, and some trouble occurs in a certain nozzle block unit. In some cases, the switch corresponding to the defective nozzle block unit may be turned off.

  On the other hand, since the nanofiber manufacturing apparatus 1 according to Embodiment 1 includes the electrospinning apparatus 10 according to Embodiment 1 as an electrospinning apparatus, it is possible to mass-produce stable quality nanofibers at high speed. In particular, the nanofiber production apparatus of the present invention can be a nanofiber production apparatus suitable for producing thick nanofibers by increasing the deposition amount of nanofibers.

[Embodiment 2]
The nanofiber manufacturing apparatus (referred to as nanofiber manufacturing apparatus 2) according to Embodiment 2 and the electrospinning apparatus (referred to as electrospinning apparatus 20) according to Embodiment 2 will be described. In the nanofiber manufacturing apparatus 2 according to the second embodiment, the electrospinning apparatus (the electrospinning apparatus 10 according to the first embodiment) is simply replaced with the electrospinning apparatus 20 according to the second embodiment. 1 is the same as the nanofiber manufacturing apparatus 1 (see FIG. 1). For this reason, illustration is abbreviate | omitted about the structure of the nanofiber manufacturing apparatus 2 which concerns on Embodiment 2. FIG.

  Hereinafter, the electrospinning apparatus 20 according to the second embodiment will be described. Also in the electrospinning apparatus 20 according to the second embodiment, four nozzle block units 250 </ b> A to 250 </ b> D along the conveying direction of the long sheet W, similarly to the electrospinning apparatus 10 according to the first embodiment (see FIG. 1). The first nozzle block 270 and the second nozzle block 280 exist in each of the nozzle block units 250A to 250D.

  The electrospinning apparatus 20 according to the second embodiment is different from the electrospinning apparatus 10 according to the first embodiment in that the pipe body 271 provided in the first nozzle block 270 and the pipe body provided in the second nozzle block 280 are different. The orientation of 281 and the installation position of the polymer solution temporary storage unit 290 are the same as those of the electrospinning apparatus 10 according to the first embodiment. For this reason, illustration is abbreviate | omitted about the whole structure of the electrospinning apparatus 20 which concerns on Embodiment 2. FIG. In addition, in the electrospinning apparatus 20 which concerns on Embodiment 2, the same component as the electrospinning apparatus 10 which concerns on Embodiment 1 is demonstrated using the same code | symbol.

  FIG. 3 is a plan view showing one nozzle block extracted from the nozzle block units 250A to 250D provided in the electrospinning apparatus 20 according to the second embodiment. In FIG. 3, the nozzle block unit 250A is taken out and shown. 3A is a plan view of the nozzle block unit 250A, and FIG. 3B is a view when FIG. 3A is viewed in the long sheet conveyance direction a (direction along the x axis). It is a side view.

  As shown in FIG. 3, the nozzle block unit 250 </ b> A in the electrospinning apparatus 20 according to the second embodiment includes each tube body 271 provided in the first nozzle block 270 and each tube provided in the second nozzle block 280. The body 281 is arranged side by side in the conveying direction of the long sheet W so that the longitudinal direction of each of the tubular bodies 271 and 281 is along the width direction of the long sheet W.

  In this case, the number of the pipe bodies 271 and the pipe bodies 281 arranged in this way is seven in order to simplify the drawing. Each polymer solution inlet 271a in each tube 271 of the first nozzle block 270 and each polymer solution inlet 281a in each tube 281 of the second nozzle block 280 are along the conveying direction a of the long sheet W. They are arranged in a line.

  The polymer solution temporary storage unit 290 has one side surface 291 of the side surfaces of the polymer solution temporary storage unit that is connected to each polymer solution inlet 271a in each tube 271 and each polymer solution inlet 281a in each tube 281. Oppositely, it is provided along the conveyance direction a of the long sheet W. The side surface 291 is provided with polymer solution outlets 293a corresponding to the polymer solution inlets 271a and 281a of the pipes 271, respectively.

  The polymer solution outlet 293a and the polymer solution inlets 271a and 281a of the pipes 271 and 281 are connected by a flexible polymer solution circulation pipe 295, respectively.

  In the electrospinning apparatus 20 according to the second embodiment, each nozzle block 270, 280 can be reciprocated along the y-axis by the reciprocating drive unit, similarly to the electrospinning apparatus 10 according to the first embodiment. And can be moved up and down along the z-axis by the interval adjusting drive.

  Although the nozzle block unit 250A has been described with reference to FIG. 3, the other nozzle block units 250B to 250D have the same configuration. And each nozzle block unit 250A-250D is located in a line along the conveyance direction a of the elongate sheet W in the nanofiber manufacturing apparatus 1 similarly to the electrospinning apparatus 10 (refer FIG. 1) which concerns on Embodiment 1. FIG. Is arranged in.

  The electrospinning apparatus 20 according to the second embodiment has the same effect as the electrospinning apparatus 10 according to the first embodiment. In addition, in the electrospinning apparatus 20 according to the second embodiment, in addition to the same effects as those of the electrospinning apparatus 10 according to the first embodiment, the polymer solution temporary storage unit 290 has the long length in the width direction of the long sheet W. It can be arranged at a position deviated from the sheet W.

  For this reason, the height limitation of the polymer solution temporary storage part 290 in the vertical direction (direction along the z-axis) can be less than that of the electrospinning apparatus according to the first embodiment. That is, the height H2 in the vertical direction (direction along the z-axis) of the polymer solution temporary storage unit 290 is the vertical direction (along the z-axis) of the polymer solution temporary storage unit 290 of the electrospinning device 10 according to the first embodiment. Direction) height H1.

  The length L3 of the polymer solution temporary storage unit 290 (the length L3 along the conveyance direction a of the long sheet W) is at least the length of two of the first nozzle block 270 and the second nozzle block 280, That is, the length obtained by adding the length L4 along the conveyance direction a of the long sheet W of the first nozzle block 270 and the length L4 along the conveyance direction a of the long sheet W of the second nozzle block 270 can do. For this reason, the electrospinning apparatus 20 according to the second embodiment has an effect that the capacity of the polymer solution temporary storage unit 290 can be made larger than that of the electrospinning apparatus 10 according to the first embodiment.

  Moreover, also by using the electrospinning apparatus 20 according to the second embodiment, a nanofiber manufacturing apparatus (nanofiber manufacturing according to the second embodiment) substantially similar to the nanofiber manufacturing apparatus 1 (see FIG. 1) according to the first embodiment. The apparatus 2) can be configured, and the nanofiber manufacturing apparatus 2 according to the second embodiment can achieve the same effects as the nanofiber manufacturing apparatus 1 according to the first embodiment.

  Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention. Variations as shown in FIG.

  (1) In each of the above embodiments, the number of the pipe bodies 271 and 281 in each nozzle block 270 and 280 is set to 7 for simplification of the drawing, but is not limited to 7. It is possible to provide a larger number of tubes. Further, the number of nozzles 240 attached to each tube 271 and 281 does not necessarily need to be the same in each tube. Moreover, although the case where the number of nozzle block units was four was illustrated in each said embodiment, it is not restricted to four, An appropriate number of nozzle block units may be provided according to the scale of a nanofiber manufacturing apparatus, etc. Is possible.

  (2) In each of the above embodiments, the nanofiber manufacturing apparatus including the electrospinning apparatus having the nozzle blocks 270 and 280 with the nozzle 240 facing upward is illustrated, but the present invention is limited to this. is not. For example, the nanofiber production apparatus may include an electrospinning apparatus having a nozzle block with a nozzle facing downward or an electrospinning apparatus having a nozzle block with a nozzle facing sideways.

  (3) In each of the above-described embodiments, the collector 230 and the power supply device 260 have four collectors 230A to 230D so as to correspond to each nozzle block unit (four nozzle block units 250A to 250D), as shown in FIG. However, the present invention is not limited to this, and a single collector and power supply device common to the four nozzle block units 250A to 250D may be used.

  (4) In each of the above embodiments, each polymer solution distribution pipe 295 is provided with a polymer solution supply amount control valve for enabling control of the supply amount of the polymer solution for each individual polymer solution distribution pipe. Also good. In this way, by controlling the supply amount of the polymer solution, for example, the supply amount of the polymer solution is changed for each tube, or the polymer solution is not supplied to a specific tube. It is also possible to set various ways of supplying the polymer solution.

  DESCRIPTION OF SYMBOLS 1 ... Nanofiber manufacturing apparatus, 10 ... Electrospinning apparatus, 100 ... Conveyance apparatus, 101 ... Supply roller, 102 ... Winding roller, 211 ... Insulating member, 230 (230A- 230D) ... collector, 240 ... nozzle, 250A-250D ... nozzle block unit, 260 (260A-260D) ... power supply, 270 ... first nozzle block, 280 ... second Nozzle block, 271, 281 ... tube, 271a, 281a ... polymer solution inlet, 271b, 281b ... polymer solution outlet, 290 ... polymer solution temporary storage, 291, 292 ... Side surface of polymer solution temporary storage part, 293a, 294a ... polymer solution outlet, 295 ... polymer solution distribution pipe, 300 ... control Device, 400 ... polymer solution storage tank, a ... conveying direction, W ... long sheet, W 'long sheets ... nanofibers are deposited

Claims (11)

An electrospinning apparatus for depositing nanofibers by discharging the polymer solution onto a long sheet that is conveyed in a predetermined conveyance direction,
A first nozzle block and a second nozzle block which are arranged along the conveying direction of the long sheet and which are opposed to the collector, and in which a plurality of nozzles for discharging the polymer solution are two-dimensionally arranged; A polymer solution temporary storage unit that temporarily holds a polymer solution to be supplied to the first nozzle block and the second nozzle block, and at least one nozzle block unit,
Each of the first nozzle block and the second nozzle block has a plurality of tubes each having one end serving as a polymer solution inlet, and each tube of the first nozzle block and each of the second nozzle blocks A predetermined number of nozzles are attached to each tubular body along the longitudinal direction of each tubular body,
The polymer solution temporary storage section is provided with a polymer solution outlet for supplying the polymer solution to the pipes,
The electrospinning apparatus, wherein each polymer solution inlet of each tube and a polymer solution outlet of the polymer solution temporary storage unit are connected by a polymer solution circulation pipe. The electrospinning apparatus according to claim 1,
Two or more nozzle block units are provided along the conveying direction of the long sheet. In the electrospinning apparatus according to claim 1 or 2,
The polymer solution that has flowed into each tube body from each polymer solution inlet port is caused to flow out to the outside of each tube body on the side of the end portion opposite to the end portion serving as each polymer solution inlet port of each tube body. An electrospinning apparatus, wherein a polymer solution outflow hole is provided. In the electrospinning apparatus according to claim 3,
An electrospinning apparatus comprising a polymer solution recovery device for recovering a polymer solution flowing out from the polymer solution outflow hole. In the electrospinning apparatus according to any one of claims 1 to 4,
Each tube body of the first nozzle block and each tube body of the second nozzle block are arranged in the width direction of the long sheet so that the longitudinal direction of each tube body is along the conveying direction of the long sheet, And each polymer solution inlet in each tube of the first nozzle block and each polymer solution inlet in each tube of the second nozzle block are arranged to face each other,
The polymer solution temporary storage part is provided between the first nozzle block and the second nozzle block, and of the side surfaces of the polymer solution temporary storage part, the side surface facing the first nozzle block Is provided with a polymer solution outlet corresponding to each polymer solution inlet of each tube in the first nozzle block, and the second nozzle is provided on a side surface facing the second nozzle block. A polymer solution outlet corresponding to each polymer solution inlet of each tube in the block is provided;
Between each polymer solution outlet of the polymer solution temporary storage section and each polymer solution inlet in each tube of the first nozzle block and each polymer solution inlet in each tube of the second nozzle block, The electrospinning apparatus is connected by the polymer solution distribution pipe. In the electrospinning apparatus according to any one of claims 1 to 4,
Each tube body of the first nozzle block and each tube body of the second nozzle block are arranged in the conveying direction of the long sheet so that the longitudinal direction of each tube body is along the width direction of the long sheet, and The polymer solution inlets in the pipes of the first nozzle block and the polymer solution inlets in the pipes of the second nozzle block are provided in a line so as to be along the conveying direction of the long sheet. ,
The polymer solution temporary storage section faces each polymer solution inlet in each tube of the first nozzle block and each polymer solution inlet in each tube of the second nozzle block, and conveys the long sheet. It is provided along the direction, and on the side surface facing each polymer solution inlet of each tubular body in the first nozzle block and the second nozzle block among the side surfaces of the polymer solution temporary storage part, A polymer solution outlet corresponding to each polymer solution inlet of each tube in the first nozzle block and the second nozzle block is provided,
Each polymer solution outlet of the polymer solution temporary storage unit and each polymer solution inlet of each tube body of the first nozzle block and the second nozzle block are connected by the polymer solution circulation pipe. An electrospinning apparatus characterized by that. In the electrospinning apparatus according to any one of claims 1 to 6,
The polymer solution temporary storage section is configured such that each polymer solution outlet of the polymer solution temporary storage section has a polymer solution inlet in each tube of the first nozzle block and each polymer solution in each tube of the second nozzle block. An electrospinning apparatus, wherein the electrospinning apparatus is provided so as to be higher in a direction of gravity than an inflow port. In the electrospinning apparatus according to any one of claims 1 to 7,
A reciprocating drive unit configured to reciprocate the first nozzle block and the second nozzle block in a predetermined cycle along the width direction of the long sheet; and the polymer solution circulation pipe has flexibility. An electrospinning apparatus characterized by comprising: The electrospinning apparatus according to claim 8,
The reciprocating motion of the first nozzle block and the second nozzle block when the first nozzle block and the second nozzle block are reciprocated at a predetermined cycle is set to be opposite to each other in adjacent nozzle blocks. An electrospinning apparatus characterized by comprising: In the electrospinning apparatus according to claim 8 or 9,
An electrospinning apparatus, further comprising an interval adjustment driving unit that adjusts an interval between the first nozzle block and the second nozzle block and the collector. A nanofiber manufacturing apparatus comprising: a conveying device that conveys a long sheet in a predetermined conveying direction; and an electrospinning device that electrospins a long sheet that is conveyed in the predetermined conveying direction,
The said electrospinning apparatus is an electrospinning apparatus in any one of Claims 1-10, The nanofiber manufacturing apparatus characterized by the above-mentioned.

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