JP2010203013A - Nanofiber-producing apparatus, method of changing resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nanofiber-producing apparatus which can easily change the kind of produced nanofibers. <P>SOLUTION: This nanofiber-producing apparatus 100 for electrically drawing a raw material liquid 300 in a space to produce the nanofibers 301 includes a feeding device 107 for force-feeding the raw material liquid 300, a guide pipe 114 for guiding the raw material liquid 300 force-fed from the feeding device 107, a hollow outflow member 115 for flowing out the raw material liquid 300 fed from the guide pipe 114 into the space with a pressure and a rotation, a shaft member 116 which is rotatably connected to the hollow outflow member 115 in a fluid-tight state, into which the guide pipe 114 is inserted, and which is connected to the guide pipe 114 in a fluid-tight state, a driving device 117 for rotating the hollow outflow member 115, and a charging device 111 for electrically charging the raw material liquid 300 through the hollow outflow member 115. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nanofiber manufacturing apparatus and a resin changing method, and more particularly, to a nanofiber manufacturing apparatus and a resin changing method capable of easily changing the resin of the nanofiber to be manufactured and improving the maintainability.

  An electrospinning (charge-induced spinning) method is known as a method for producing a filamentous (fibrous) material (nanofiber) made of a resin or the like and having a submicron-scale diameter.

  In this electrospinning method, a raw material liquid in which a solute such as a resin is dispersed or dissolved in a solvent is discharged (discharged) into the space with a nozzle or the like, and the raw material liquid is charged by being charged to fly through the space. This is a method for obtaining nanofibers by electrically stretching the raw material liquid therein.

  A more specific description of the electrospinning method is as follows. That is, the raw material liquid that has been charged and discharged into the space gradually evaporates the solvent while flying through the space. As a result, the volume of the raw material liquid in flight gradually decreases, but the charge imparted to the raw material liquid remains in the raw material liquid. As a result, the charge density of the raw material liquid in flight through the space gradually increases. Since the solvent continues to evaporate, the charge density of the raw material liquid further increases, and when the repulsive Coulomb force generated in the raw material liquid exceeds the surface tension of the raw material liquid, the raw material liquid explodes. A phenomenon (hereinafter referred to as “electrostatic stretching phenomenon”) occurs. This electrostatic stretching phenomenon occurs geometrically in the space one after another, so that nanofibers made of a resin having a diameter of submicron order are manufactured.

As an apparatus for producing nanofibers using the electrostatic stretching phenomenon as described above, the inventors of the present application made large amounts of nanofibers stable by causing the raw material liquid to flow out radially using centrifugal force. The manufacturing apparatus which can be manufactured with quality is proposed previously (refer patent document 1).
JP 2008-285792 A

  However, when changing the type of nanofibers manufactured in a conventional apparatus, it is necessary to remove the remaining raw material liquid or stuck resin from the member for discharging the raw material liquid by centrifugal force. Requires a lot of effort. This is because the structure becomes complicated in order to generate centrifugal force. Furthermore, it is necessary to replace the supply path for supplying the raw material liquid to the member because it is difficult to completely remove the remaining raw material liquid. However, the supply path for supplying the raw material liquid to the rotating member is firmly attached to resist vibrations, and the replacement work is not easy.

  The present invention has been made in view of the above-mentioned operational difficulties, and aims to provide a nanofiber manufacturing apparatus and a resin changing method that make it easy to replace a supply path for supplying a raw material liquid. . Furthermore, the second object is to provide a nanofiber manufacturing apparatus that facilitates cleaning of a member that causes the raw material liquid to flow out.

In order to achieve the above object, a nanofiber manufacturing apparatus according to the present invention is a nanofiber manufacturing apparatus for manufacturing nanofibers by electrically stretching a raw material liquid in a space, and pumping the raw material liquid A supply device for supplying, a guide tube for guiding the raw material liquid fed from the supply device, and a hollow for allowing the raw material liquid supplied from the guide tube to flow into the space by the pressure of the raw material liquid and its rotation. An outflow body, a shaft body connected to the outflow body in a rotatable and liquid-tight state, the shaft inserted into the guide tube in a liquid-tight state, and the outflow body being rotated A driving device and a charging device that charges the raw material liquid through the effluent and charges the raw material liquid are provided.

  According to this, the guide tube and the outflow body can be separated by simply removing the guide tube from the shaft body, and when changing the type of nanofiber to be manufactured, the guide tube can be easily and quickly. It is possible to proceed with the replacement work.

  Moreover, it is preferable that the said guide pipe and the said shaft body are connected to a liquid-tight state via the sealing member arrange | positioned so that the outer periphery of the said guide pipe may be enclosed.

  Thereby, it becomes possible to improve the reliability in a connection part, such as the possibility of liquid leakage.

  In addition, the guide tube has a diameter-expanded portion that is disposed in the shaft body and expands due to the pressure of the raw material liquid, and the guide tube and the shaft body are liquid-tight when the diameter-expanded portion expands the diameter. It may be connected to the state.

  Thereby, while the nanofiber manufacturing apparatus is in operation, that is, while the raw material liquid is being supplied, the diameter-enlarged portion of the guide tube and the shaft body are firmly connected in a liquid-tight state by the pressure of the raw material liquid. On the other hand, when the guide tube needs to be replaced, the raw material liquid is not supplied and the diameter-expanded portion is not expanded, so that the guide tube can be easily extracted from the shaft body. Accordingly, the replacement work can be smoothly performed.

  In addition, the outflow body is restricted from moving relative to the shaft body in the axial direction, and has a cylindrical rotating base that is rotatably connected to the shaft body, and is detachable from the rotating base. And a lid that is connected to the guide tube and closes the storage chamber for storing the raw material liquid so as to be openable and closable.

  According to this, since the storage chamber provided in the outflow body can be opened, it becomes possible to easily and quickly perform the outflow body cleaning work when changing the type of the nanofiber.

  The supply device includes an airtight container that stores a raw material liquid, a pressure increasing device that introduces gas into the container to increase the pressure in the container, and one open end is disposed in a state of being immersed in the raw material liquid, It is preferable that an open end of the tube is disposed outside the container and includes a tubular lead-out tube attached to the container in an airtight state.

  According to this, since it becomes possible to continue supplying the raw material liquid at a constant pressure, it becomes possible to avoid a change in the quality of the nanofiber due to the pulsation of the supplied raw material liquid. In addition, since the raw material liquid is stored in an airtight state, it is possible to avoid the evaporation of the solvent from the stored raw material liquid as much as possible.

  In particular, it is preferable that the guide tube has a diameter-expanded portion because the connection state between the diameter-expanded portion and the shaft body is stable.

  It is preferable that the supply device further includes a second container having a larger capacity than the container and a transfer device for transferring the raw material liquid from the second container to the container.

  According to this, the raw material liquid can be stably supplied over a long period of time, and it becomes possible to continue producing nanofibers in a stable state.

  In order to achieve the above object, a resin changing method according to the present invention includes a supply device that feeds and feeds a raw material liquid, a guide tube that guides the raw material liquid fed from the supply device, and a supply from the guide tube. A hollow outflow body that causes the raw material liquid to flow out into the space by the pressure of the raw material liquid and the rotation of the raw material liquid, and is connected to the outflow body in a rotatable and liquid-tight state, and the guide tube is inserted therein A shaft body that is connected to the guide tube in a liquid-tight state, a driving device that rotates the outflow body, and a charging device that charges and charges the raw material liquid via the outflow body. In a nanofiber manufacturing apparatus for manufacturing a nanofiber by electrically stretching a liquid in a space, a resin changing method for changing the type of resin constituting the nanofiber, the guide tube being removed from the shaft body. Take off and other feeding equipment Other guide pipe connected is inserted into the shaft body, and supplying the raw material liquid in the other feed device and the other of the guide tube.

  According to this, the guide tube and the outflow body can be separated by simply removing the guide tube from the shaft body, and when changing the type of nanofiber to be manufactured, the guide tube can be easily and quickly. It is possible to proceed with the replacement work.

  According to the present invention, the replacement operation of the supply path for supplying the raw material liquid is facilitated, and the cleaning operation of the member that causes the raw material liquid to flow out is facilitated.

  Next, a nanofiber manufacturing apparatus and a resin changing method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a nanofiber manufacturing apparatus with a part cut away.

  As shown in the figure, the nanofiber manufacturing apparatus 100 includes a discharge device 101, a guide body 102, a collection device 103, and an attracting device 104.

  Here, the raw material liquid for manufacturing the nanofiber is referred to as a raw material liquid 300, and the manufactured nanofiber is referred to as a nanofiber 301. Since it changes to 301, the boundary between the raw material liquid 300 and the nanofiber 301 is ambiguous and cannot be clearly distinguished.

  The discharge device 101 is a unit that can discharge the charged raw material liquid 300 and the manufactured nanofiber 301 on a gas flow.

  FIG. 2 is a plan view showing a part of the discharge device by cutting away.

  FIG. 3 is a perspective view showing the appearance of the discharge device.

  As shown in these drawings, the discharge device 101 includes an outflow device 110, a charging device 111, a wind tunnel body 112, a blower device 113, and a supply device 107.

  The outflow device 110 is a device for causing the supplied raw material liquid 300 to flow out into the space by centrifugal force without being brought into contact with air, and is an apparatus for applying a charge to the raw material liquid 300 and charging it. In the present embodiment, the outflow device 110 includes an outflow body 115, a shaft body 116, and a drive device 117.

  The outflow body 115 is a member for causing the raw material liquid 300 to flow into the space by the pressure and centrifugal force of the raw material liquid 300, and is connected to the shaft body 116 in a liquid-tight state and rotatable relative to the shaft body 116. It is a hollow member. An outflow hole 118 is provided in the peripheral wall of the outflow body 115. When the nanofiber 301 is manufactured, the outflow body 115 is filled with the raw material liquid 300, and the raw material liquid 300 is caused to flow out into the space by the pressure of the raw material liquid 300 and the centrifugal force due to its rotation. It is a possible member. In the case of the present embodiment, the outflow body 115 has a cylindrical shape with one end closed, and the peripheral wall includes a number of outflow holes 118 through which the raw material liquid 300 flows out from the inside of the outflow body 115 to the outside. ing. In addition, the outflow body 115 is formed of a conductor in order to impart electric charge to the stored raw material liquid 300.

  In the case of the present embodiment, the outflow body 115 can be separated into the rotating base 119 and the lid 120. This is for the purpose of facilitating maintenance such as cleaning the inside of the outflow body 115 by separating the lid 120 from the rotating base 119.

  The rotating base 119 is a cylindrical member that is restricted in relative movement with the shaft body 116 in the axial direction and is rotatably connected to the shaft body 116. In the case of the present embodiment, the rotating base 119 is connected to the shaft body 116 via a bearing 109 and is attached to the shaft body 116 so as to be rotatable. The rotating base 119 is connected to the outer peripheral wall of the shaft body 116 via a packing 106 that can rotate and slide and can maintain the sliding portion in a liquid-tight manner. Thereby, the outflow body 115 can be connected to the shaft body 116 in a liquid-tight state and rotatably with respect to the shaft body 116.

  The lid 120 is a member that is detachably attached to the rotating base 119 and closes the storage chamber 108 that stores the raw material liquid 300 so as to be openable and closable. In the case of the present embodiment, the lid 120 is a cylindrical body whose one end is closed, and an outflow hole 118 is provided in the peripheral wall of the lid 120. Thus, the storage chamber 108 can be easily cleaned by allowing the storage chamber 108 of the outflow body 115 storing the raw material liquid 300 to be opened by attaching and detaching the lid 120. Further, by providing the outflow hole 118 in the lid 120, a cleaning method such as immersing the lid 120 removed from the outflow body 115 in a solvent and applying ultrasonic waves can be easily selected. The inner wall can also be easily cleaned.

  Specifically, it is preferable that the diameter of the outflow body 115 is adopted from a range of 10 mm or more and 300 mm or less. This is because if it is too large, it will be difficult to concentrate the raw material liquid 300 and the nanofiber 301 by the gas flow described later, and if the weight balance is slightly deviated, for example, the rotational axis of the effluent 115 is deviated, a large vibration will occur. This is because a structure that firmly supports the outflow body 115 is required to suppress the vibration. On the other hand, if it is too small, the rotation for causing the raw material liquid 300 to flow out by centrifugal force must be increased, which causes problems such as load and vibration of the drive source. Furthermore, it is preferable to employ the diameter of the outflow body 115 from the range of 20 mm or more and 150 mm or less.

  In addition, the shape of the outflow hole 118 is preferably circular, and the diameter thereof is preferably from about 0.01 mm to 3 mm, although it depends on the thickness of the outflow body 115. This is because if the outflow hole 118 is too small, it is difficult to cause the raw material liquid 300 to flow out of the outflow body 115, and if it is too large, the unit of the raw material liquid 300 that flows out from one outflow hole 118. This is because the amount per hour becomes too large (that is, the thickness of the line formed by the flowing out raw material liquid 300 becomes too thick), making it difficult to manufacture the nanofiber 301 having a desired diameter. Further, it is preferable that the outflow hole 118 has a short hole length. This is because it is easy to remove the resin blocking the outflow hole 118 during maintenance.

  The shape of the outflow body 115 is not limited to a cylindrical shape, and may be a polygonal cylindrical shape having a polygonal cross section or a conical shape. It is sufficient that the raw material liquid 300 can flow out of the outflow hole 118 by centrifugal force by rotating the outflow hole 118. Further, the shape of the outflow hole 118 is not limited to a circular shape, and may be a polygonal shape or a star shape.

  The shaft body 116 is a member that is connected to the outflow body 115 in a rotatable and liquid-tight state, and has a guide tube 114 (described later) inserted therein and connected to the guide tube 114 in a liquid-tight state. In the case of the present embodiment, the shaft body 116 is a cylindrical member that functions as a rotating shaft body of the outflow body 115, and the outflow body 115 rotates around the shaft body 116. One end opening of the shaft body 116 faces the storage chamber 108 of the outflow body 115, and the other end is fixed to the base.

  The driving device 117 is a device that applies a rotational driving force to the outflow body 115 in order to cause the raw material liquid 300 to flow out from the outflow hole 118 by centrifugal force. In the case of the present embodiment, the driving device 117 includes a belt drive mechanism and a motor, and applies a rotational force to the outflow body 115 by rotating a pulley attached to the rotating base 119 of the outflow body 115 with a belt. ing. In this way, by transmitting the driving force through the belt drive mechanism, the motor and the outflow body 115 can be insulated.

  The driving device 117 may include a hollow shaft motor, and the shaft body 116 may be inserted inward of the hollow shaft, and the outflow body 115 may be directly rotated by the hollow shaft.

  The rotational speed of the outflow body 115 may be selected from a range of several rpm or more and 10,000 rpm or less depending on the diameter of the outflow hole 118, the viscosity of the raw material liquid 300 to be used, the type of polymer substance in the raw material liquid, and the like. preferable.

  FIG. 4 is a diagram schematically showing a part of the supply device by cutting away.

  As shown in the figure, the supply device 107 includes a container 151, a booster 153, and a lead-out pipe 156, and a second container 152, a transfer device 155, an on-off valve 159, a guide pipe 114, and the like. It has.

  The supply device 107 includes a weight measuring device 141 and a control device 142.

  The container 151 is a container that can store the raw material liquid 300 and can maintain airtightness against the pressure of the gas supplied from the pressure increasing device 153. In addition, a lead-out pipe 156, an introduction pipe 157, and a gas introduction pipe 158 are inserted into the container 151, and it is considered that the airtightness of the container 151 is broken by these, but the raw material liquid from the container 151 is broken. The introduction pipe 156, the introduction pipe 157, the gas introduction pipe 158, and other parts for introducing and deriving 300 are not included in the concept of the airtightness of the container 151.

  Since the container 151 is in an airtight state, the raw material liquid 300 can be pumped from the outlet pipe 156 by gas pressure. Further, since the container 151 is in an airtight state, it is possible to suppress the solvent from evaporating from the raw material liquid 300, and since the pressure inside the container 151 is increased, the evaporation of the solvent can be further suppressed. Therefore, it is possible to stably pump the effluent 115 without reducing the quality of the raw material liquid 300.

  The pressure increasing device 153 is a device that introduces gas into the container 151 and raises the pressure in the container 151. In the case of this embodiment, the booster 153 includes a pressure source 161 and a regulating valve 162. The pressure source 161 is a device such as a cylinder or an accumulator in which high-pressure gas is sealed, for example. The regulating valve 162 is a so-called regulator that can lower the pressure of the pressure source 161 to a predetermined pressure.

  In the case of the present embodiment, the pressure increasing device 153 reduces the pressure of the high-pressure gas supplied from the pressure source 161 until the pressure reaches a predetermined pressure by the adjustment valve 162, and the gas having the predetermined pressure is passed through the gas introduction pipe 158. By introducing the inside of the container 151, the pressure inside the container 151 can be maintained at a predetermined pressure.

  The gas used for the booster 153 is not particularly limited. For example, air may be used. Note that depending on the type of raw material liquid 300 and the type of gas, the quality of the raw material liquid 300 may be affected, for example, by reaction with oxygen. It doesn't matter. For example, an inert gas such as nitrogen gas or carbon dioxide gas may be used as the gas.

  The lead-out tube 156 is a tubular member that can be disposed in a state in which one open end is immersed in the raw material liquid 300 stored in the container 151 and the other open end is disposed outside the container 151. The lead-out pipe 156 is connected to the outflow body 115 via the guide pipe 114 and the shaft body 116, and the inside of the lead-out pipe 156 is open via the outflow hole 118. However, as described above, the outlet pipe 156 is not included in the definition of the airtightness of the container 151, and the outer peripheral surface of the outlet pipe 156 and the container 151 are connected in an airtight state. In addition, it may be considered that the airtightness of the container 151 is maintained at two points: one open end of the outlet pipe 156 is sealed with the raw material liquid 300.

  The second container 152 is a container having a larger capacity than the container 151, and can store a large amount of the raw material liquid 300. The second container 152 is also preferably provided with a certain degree of airtightness and capable of blocking the stored raw material liquid 300 and the atmosphere outside the second container 152.

  The transfer device 155 is a device for transferring the raw material liquid 300 from the second container 152 to the container 151. An example of the transfer device 155 is a pump. The second container 152 may have the same structure as the container 151, and may transfer the raw material liquid 300 by gas pressure.

  The on-off valve 159 is an electromagnetic valve that can select whether or not to pass the raw material liquid 300 supplied from the transfer device 155.

  The guide tube 114 is a tube that guides the raw material liquid 300 fed from the supply device 107 to the outflow body 115. In the case of the present embodiment, the distal end portion of the guide tube 114 is disposed within the shaft body 116 and is a diameter-expanded portion 126 that is expanded by the pressure of the raw material liquid. The entire guide tube 114 is also made of the same flexible material as the enlarged diameter portion 126. The outer diameter of the guide tube 114 substantially coincides with the inner diameter of the shaft body 116, and when the high-pressure raw material liquid 300 is inserted into the guide tube 114, the diameter-expanded portion 126 expands to increase the shaft. The guide tube 114 and the shaft body 116 are connected in close contact with the inner wall of the body 116 in a liquid-tight state. When the raw material liquid 300 is not inserted into the guide tube 114, the guide tube 114 can be easily inserted into and extracted from the shaft body 116.

  The guide tube 114 is not limited to the above embodiment. For example, as shown in FIG. 6, the guide tube 114 may be connected to the shaft body 116 in a liquid-tight state via a sealing member 136 disposed so as to surround the outer periphery of the guide tube 114. In this case, the distal end portion of the guide tube 114 is formed of a rigid body.

  The weight measuring device 141 is a device for measuring the weight of the container 151 to be placed, the raw material liquid 300 to be accommodated, and the like, and can transmit the measurement result as information.

  The control device 142 analyzes the information received from the weight measuring device 141, and when the information obtained from the weight measuring device 141 includes information equal to or less than a predetermined weight, the control device 142 controls the on-off valve 159 to change the raw material liquid 300. It is a device that can be supplied to the inside of the container 151.

  FIG. 5 is another diagram showing the timing of supplying the raw material liquid from the second container.

  As shown in the figure, the weight measuring device 141 transmits a GL signal when the weight becomes a predetermined value or less, and transmits a GH signal when the weight becomes a predetermined value or more. The on-off valve 159 that has received the GL signal is opened, and the transfer device 155 that has received the GL signal sucks up and feeds the raw material liquid 300 stored in the second container 152 with the pressure P1. The pumping is continued until the GH signal is received, and the raw material liquid 300 is supplied to the container 151. In this case, the pressure of the gas introduced into the booster 153 is adjusted so that the pressure in the container 151 is constant. On the other hand, in a state where the raw material liquid 300 is not supplied from the second container 152, the opening / closing valve 159 is closed, so that a predetermined pressure is maintained inside the container 151 by the booster 153. Therefore, the raw material liquid 300 is always supplied from the container 151 at a constant pressure.

  With the above configuration, the amount of the raw material liquid 300 accommodated in the container 151 can be kept within a predetermined range, and the state of the raw material liquid 300 supplied to the effluent 115 can be kept constant. . Furthermore, by performing the control based on the information regarding the weight, the amount of the raw material liquid 300 inside the container 151 can be maintained within a predetermined range regardless of the type of the raw material liquid 300. For example, even when the viscosity of the raw material liquid 300 is high and the height of the liquid surface of the raw material liquid 300 due to the float cannot be measured, the control can be performed.

  The charging device 111 is a device that charges the raw material liquid 300 by applying an electric charge. In the present embodiment, as shown in FIGS. 1 to 3, the charging device 111 includes a charging electrode 121, a charging power source 122, and a grounding device 123.

  The charging electrode 121 is a member for inducing charges to the lid body 120 of the effusing body 115 by itself becoming a high voltage or a low voltage with respect to the effusing body 115. In the case of the present embodiment, the charging electrode 121 is an annular member disposed so as to surround the periphery of the outflow body 115. When a positive voltage is applied to the charging electrode 121, a negative charge is induced in the outflow body 115, and when a negative voltage is applied to the charging electrode 121, a positive charge is induced in the outflow body 115. .

  The size of the charging electrode 121 needs to be larger than the diameter of the outflow body 115, and the diameter is preferably selected from a range of 50 mm or more and 1500 mm or less. The shape of the charging electrode 121 is not limited to an annular shape, and may be a polygonal annular shape or a flat plate shape depending on the relationship with the shape of the outflow body 115. Further, the cross-sectional shape of the charging electrode 121 may be not only rectangular but also round.

  The grounding device 123 is a member that is electrically connected to the outflow body 115 and can maintain the outflow body 115 at the ground potential. One end of the grounding device 123 functions as a brush so that the electrical connection state can be maintained even when the outflow body 115 is in a rotating state, and the other end is connected to the ground. The grounding device 123 may be electrically connected to the outflow body 115, and the outflow body 115 and the grounding device 123 may be slightly separated.

  The charging power source 122 is a power source that can apply a high voltage to the charging electrode 121. In general, the charging power source 122 is preferably a DC power source. In particular, when the charged polarity of the generated nanofiber 301 is not affected, the charged nanofiber 301 is used to attract the nanofiber 301 with an electrode to which a reverse polarity potential is applied. Is preferably a DC power supply. When the charging power source 122 is a direct current power source, the voltage applied by the charging power source 122 to the charging electrode 121 is preferably set from a value in the range of 10 KV or more and 200 KV or less. When a negative voltage is applied to the charging power source 122, the polarity of the applied voltage becomes negative. In particular, the electric field strength between the outflow body 115 and the charging electrode is important, and the applied voltage is adjusted so that the electric field strength is 1 KV / cm or more in the space where the distance between the charging electrode 121 and the outflow body 115 is the closest. Is preferred.

  If an induction method in which one electrode is grounded as the charging device 111 as in the present embodiment is adopted, charge can be imparted to the raw material liquid 300 while the effluent 115 is maintained at the ground potential. If the outflow body 115 is in the ground potential state, it is not necessary to electrically insulate members such as the shaft body 116 and the driving device 117 connected to the outflow body 115 from the outflow body 115, and the outflow apparatus 110 has a simple structure. Can be adopted, which is preferable.

  Note that as the charging device 111, a charge may be applied to the raw material liquid 300 by connecting a power source to the effluent body 115, maintaining the effluent body 115 at a high voltage, and grounding the charging electrode 121.

  The blower device 113 is a device that changes the flight direction of the raw material liquid 300 flowing out from the outflow body 115 and generates a gas flow for transporting the nanofiber 301 and passing the inside of the guide body 102. In the case of the present embodiment, the air blower 113 generates a gas flow from the base 154 side toward the tip of the effluent body 115. The blower 113 can generate wind power that can change the raw material liquid 300 flowing out from the outflow body 115 in the radial direction in the axial direction. In FIG. 2, the gas flow is indicated by arrows. In the case of the present embodiment, the air blower 113 is composed of an axial fan.

  The air blower 113 may be constituted by other blowers such as a sirocco fan. Further, a gas flow may be generated inside the wind tunnel body 112 by a suction device 132 described later. In this case, the nanofiber manufacturing apparatus 100 does not have the air blower 113 that actively generates a gas flow, but the gas flow is generated inside the wind tunnel body 112 or the like by some device. Assume that the nanofiber manufacturing apparatus 100 includes a blower 113.

  Furthermore, the discharge device 101 includes a wind tunnel body 112, a wind control body 124, and a heating device 125.

  The wind tunnel body 112 is a conduit that guides the gas flow generated by the blower 113 between the charging electrode 121 and the outflow body 115. In the case of the present embodiment, the gas flow guided by the wind tunnel body 112 crosses the raw material liquid 300 flowing out from the outflow hole 118 of the outflow body 115 while passing through the inside of the charging electrode 121, and Change the flight direction.

  The wind control body 124 has a function of controlling the gas flow so that the gas flow generated by the blower 113 does not hit the open end of the outflow hole 118. In the case of the present embodiment, an air passage body that guides a gas flow to flow in a predetermined region is adopted as the wind control body 124. Since the gas flow does not directly hit the outflow hole 118 by the wind control body 124, the raw material liquid 300 flowing out from the outflow hole 118 is prevented from evaporating at an early stage and blocking the outflow hole 118 as much as possible. It becomes possible to keep 300 flowing out stably. The wind control body 124 may be a wall-shaped windbreak wall that is arranged on the windward side of the outflow hole 118 and prevents the gas flow from reaching the vicinity of the outflow hole 118.

  The heating device 125 is a heating source that heats the gas constituting the gas flow generated by the blower device 113. In the case of the present embodiment, the heating device 125 is an annular heater disposed inside the guide body 102 and can heat the gas passing through the heating device 125. By heating the gas flow with the heating device 125, evaporation of the raw material liquid 300 flowing out into the space is promoted, and the nanofiber 301 can be efficiently manufactured.

  FIG. 7 is a perspective view showing the vicinity of the guide body.

  As shown in the figure, the guide body 102 is a wind tunnel that guides the nanofiber 301 that is discharged from the discharge device 101 and conveyed by the gas flow to a predetermined place.

  The diffuser 127 is a conduit that is connected to the guide body 102 and diffuses the nanofibers 301 conveyed in a high density state in the space uniformly and in a low density state, and smoothes the space in which the nanofibers 301 are guided. And it is a hood-like member which gradually decelerates the speed of the gas flow which conveys nanofiber 301, and the speed of nanofiber 301 by expanding continuously. In the case of the present embodiment, the diffuser 127 has a hood shape that maintains the height of the guide body 102 as it is and gradually expands only the width.

  The collection device 103 is a device for collecting the nanofibers 301 emitted from the guide body 102. In the case of the present embodiment, the collection device 103 includes a member to be deposited 128, a winding device 129, and a member supply device 130.

  The member 128 to be deposited is a member that separates the nanofiber 301 manufactured by the electrostatic stretching phenomenon and conveyed by the gas flow from the gas flow, and deposits only the nanofiber 301. In the case of the present embodiment, the member 128 to be deposited is a thin and flexible long sheet-like member made of a material that can be easily separated from the deposited nanofibers 301, and easily passes a gas flow. It is a net-like member that can collect the nanofibers 301. Specifically, as the member 128 to be deposited, a long cloth made of aramid fibers can be exemplified. Furthermore, it is preferable to apply a Teflon (registered trademark) coating on the surface of the member 128 to be deposited because the peelability when the deposited nanofiber 301 is peeled off from the member 128 to be deposited is improved. Further, the deposition target member 128 is supplied from the member supply device 130 in a state of being wound in a roll shape.

  The winding device 129 is a device that can transfer the member 128 to be deposited. In the case of the present embodiment, the member to be deposited 128 is transported together with the nanofibers 301 to be pulled out from the member supply device 130 while winding the long member to be deposited 128. The winding device 129 can wind up the nanofiber 301 deposited in a nonwoven fabric shape together with the member 128 to be deposited.

  As shown in FIG. 1, the attracting device 104 is a device for attracting the nanofiber 301 to the deposition target member 128. In the case of the present embodiment, the attracting device 104 includes a gas attracting device 143 and an electric field attracting device 133 so that different attracting methods can be performed simultaneously or selectively.

  The gas attracting device 143 is a device that attracts the nanofiber 301 to the deposition target member 128 by sucking a gas flow, and is disposed behind the deposition target member 128. In the case of the present embodiment, the gas attracting device 143 includes a suction device 132 and a concentrating body 131.

  The concentrator 131 is a member that receives the gas flow spread by the diffuser 127 and concentrates the gas flow until reaching the suction device 132, and has a funnel shape opposite to the diffuser 127.

  The suction device 132 is a blower that forcibly sucks the gas flow passing through the member 128 to be deposited. The suction device 132 is a blower such as a sirocco fan or an axial fan, and is a device capable of accelerating a gas flow that has passed through the deposition target member 128 and has a reduced velocity to a high velocity. By sucking the gas flow with the suction device 132, the solvent that evaporates when the nanofiber 301 is manufactured is also sucked at the same time. By doing so, even when a highly flammable solvent is used, the inside of the guide body 102 does not reach the explosion concentration, and the apparatus can be used with confidence.

  The electric field attracting device 133 is a device that attracts the charged nanofiber 301 to the deposition target member 128 by an electric field, and includes an attracting electrode 134 and an attracting power source 135.

  The attracting electrode 134 is an electrode for generating an electric field for attracting the charged nanofiber 301. In the case of the present embodiment, a metal net capable of passing a gas flow is employed for the attracting electrode 134. The attracting electrode 134 is provided so as to spread over the entire opening of the diffuser 127.

  The attraction power source 135 is a DC power source that can maintain the attraction electrode 134 at a predetermined voltage and polarity. In the case of the present embodiment, the attracting power source 135 is a DC power source that can freely change the voltage and polarity in the range of 0 V (grounded state) to 200 KV or less.

  In addition, although the metal mesh is employ | adopted for the attracting electrode 134 in embodiment, it is not limited to it. For example, a rod-like body having a predetermined width and a length approximately equal to the width of the member to be deposited 128 may be used. A plurality of rod-like attracting electrodes 134 may be arranged.

  When the charging power source 122 is an AC power source, the attracting power source 135 may be an AC power source.

  The recovery device 105 is a device that can separate and recover the solvent evaporated from the raw material liquid 300 from the gas flow. The recovery device 105 differs depending on the type of solvent used in the raw material liquid 300. For example, a device that recovers a gas by condensing the solvent at a low temperature, a device that adsorbs only the solvent using activated carbon or zeolite, a liquid Examples thereof include an apparatus for dissolving a solvent in the apparatus and a combination of these apparatuses.

  Here, as the resin constituting the nanofiber 301, polypropylene, polyethylene, polystyrene, polyethylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly-m-phenylene terephthalate, poly-p-phenylene isophthalate, polyfluoride. Vinylidene, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinyl chloride, polyvinylidene chloride-acrylate copolymer, polyacrylonitrile, polyacrylonitrile-methacrylate copolymer, polycarbonate, polyarylate, polyester carbonate, polyamide, aramid, polyimide , Polycaprolactone, polylactic acid, polyglycolic acid, collagen, polyhydroxybutyric acid, polyvinyl acetate, Ripepuchido etc. and can be exemplified a polymer material such as a copolymer thereof. Moreover, the kind selected from the above may be used, and a plurality of kinds may be mixed. In addition, the above is an illustration and this invention is not limited to the said resin.

  Examples of the solvent used for the raw material liquid 300 include volatile organic solvents. Specific examples are methanol, ethanol, 1-propanol, 2-propanol, hexafluoroisopropanol, tetraethylene glycol, triethylene glycol, dibenzyl alcohol, 1,3-dioxolane, 1,4-dioxane, methyl ethyl ketone, methyl isobutyl. Ketone, methyl-n-hexyl ketone, methyl-n-propyl ketone, diisopropyl ketone, diisobutyl ketone, acetone, hexafluoroacetone, phenol, formic acid, methyl formate, ethyl formate, propyl formate, methyl benzoate, ethyl benzoate, benzoate Propyl acid, methyl acetate, ethyl acetate, propyl acetate, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, methyl chloride, ethyl chloride, methylene chloride, chloroform, o-chloroto Ene, p-chlorotoluene, chloroform, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, trichloroethane, dichloropropane, dibromoethane, dibromopropane, methyl bromide, ethyl bromide, propyl bromide, acetic acid, Benzene, toluene, hexane, cyclohexane, cyclohexanone, cyclopentane, o-xylene, p-xylene, m-xylene, acetonitrile, tetrahydrofuran, N, N-dimethylformamide, N, N-dimethylacetamide, dimethylsulfoxide, pyridine, water Etc. can be listed. Moreover, the kind selected from the above may be used, and a plurality of kinds may be mixed. In addition, the above is an illustration and the raw material liquid 300 used for this invention is not limited to employ | adopting the said solvent.

Furthermore, an additive such as an aggregate or a plasticizer may be added to the raw material liquid 300. Examples of the additive include oxides, carbides, nitrides, borides, silicides, fluorides, sulfides, and the like. From the viewpoints of heat resistance and workability, oxides are preferably used. Examples of the oxide include Al ₂ O ₃ , SiO ₂ , TiO ₂ , Li ₂ O, Na ₂ O, MgO, CaO, SrO, BaO, B ₂ O ₃ , P ₂ O ₅ , SnO ₂ , ZrO ₂ , K. ₂ O, Cs ₂ O, ZnO, Sb ₂ O ₃ , As ₂ O ₃ , CeO ₂ , V ₂ O ₅ , Cr ₂ O ₃ , MnO, Fe ₂ O ₃ , CoO, NiO, Y ₂ O ₃ , Lu ₂ Examples thereof include O ₃ , Yb ₂ O ₃ , HfO ₂ , Nb ₂ O _{5 and the} like. Moreover, the kind selected from the above may be used, and a plurality of kinds may be mixed. In addition, the above is an illustration and the substance added to the raw material liquid 300 of this invention is not limited to the said additive.

  Although the mixing ratio of the solvent and the resin in the raw material liquid 300 varies depending on the type of the solvent and the type of the resin, the amount of the solvent is preferably between about 60 wt% and 98 wt%.

  As in the present embodiment, when the raw material liquid 300 and the manufactured nanofibers 301 are transported by a gas flow, and the gas flow is sucked by the suction device 132, the solvent vapor flows without stagnation. Even if it is the raw material liquid 300 containing 50 weight% or more, it will fully evaporate and it will become possible to generate an electrostatic stretching phenomenon. Therefore, since the nanofiber 301 can be manufactured from a state in which the concentration of the resin that is a solute is low, it is also possible to manufacture a thinner nanofiber 301. Moreover, since the adjustable range of the raw material liquid 300 is expanded, the performance range of the manufactured nanofiber 301 can be increased.

  Next, the manufacturing method of the nanofiber 301 using the nanofiber manufacturing apparatus 100 of the said structure is demonstrated.

  First, the air blower 113 and the suction device 132 are operated to generate a gas flow from the discharge device 101 to the collection device 103 inside the wind tunnel body 112, the guide body 102, the diffuser body 127, and the concentrated body 131 ( Gas flow generation process). In the above state, the nanofiber manufacturing apparatus 100 was adjusted so that the air volume in the guide body 102 was 30 m2 per minute.

  Next, a gas having a predetermined pressure is introduced into the container 151 from the booster 153. In the case of the present embodiment, by monitoring the weight of the container 151 and appropriately supplying the raw material liquid 300 from the second container 152 to the container 151, a certain amount of the raw material liquid 300 is always stored in the container 151. . In addition, air was used as the gas introduced from the booster 153. Thereby, the pressure inside the container 151 is increased, and the raw material liquid 300 is always led out from the outlet pipe 156 at a constant pressure.

  The raw material liquid 300 led out from the container 151 passes through the guide tube 114 and is pumped to the storage chamber 108 of the effluent 115. Here, the outlet tube 156, the guide tube 114, and the outflow body 115 are connected in series, and the raw material liquid 300 is supplied to the storage chamber 108 of the outflow body 115 without being exposed to air.

  If the capacity of the container 151 is sufficient, the container 151 may be operated with the on-off valve 159 kept closed. This is because the sealed state can be maintained when the liquid level is pressed at a predetermined pressure.

The raw material liquid 300 supplied to the outflow body 115 fills the storage chamber 108 and flows out from the outflow hole 118 into the space (supply process). As described above, the raw material liquid 300 reaches the outflow hole 118 without being exposed to air from the supply device 107. Polyurethane is selected as the resin as the solute employed in the present embodiment. Further, N, N-dimethylacetamide was selected as the solvent constituting the raw material liquid 300. The mixing ratio of the solute and the solvent in the raw material liquid 300 was 25% by weight of polyurethane and 75% by weight of N, N-dimethylacetamide.

  Next, the charging electrode 121 is set to a positive or negative high voltage by the charging power source 122. Charge concentrates in the outflow hole 118 of the outflow body 115 arranged in the vicinity of the charging electrode 121, and the charge passes through the outflow hole 118 of the outflow body 115 and is transferred to the raw material liquid 300 which flows into the space. 300 is charged (charging process).

  At the same time as the charging step, the driving body 117 rotates the outflow body 115, and the raw material liquid 300 flows out into the space with a predetermined pressure and centrifugal force from the outflow hole 118 provided in the peripheral wall of the outflow body 115 (rotation process). Spill process).

  Specifically, an effluent 115 having an outer diameter of Φ60 mm was used. The outflow body 115 is provided with 72 outflow holes 118 at equal intervals in the circumferential direction. The diameter of the outflow hole 118 was 0.2 mm, and the shape was circular. On the other hand, the charging electrode 121 having an inner diameter of Φ600 mm was used, and the charging electrode 121 was made negative 60 KV with respect to the ground potential by the charging power source 122. As a result, a positive charge is induced in the effluent 115, and the positively charged raw material liquid 300 flows out.

  The raw material liquid 300 that has flowed out of the outflow hole 118 first comes into contact with the gas flow (air), is transported by the gas flow (conveying step), and is guided to the guide body 102 in the gas flow.

  Here, since the charged state of the raw material liquid 300 and the charging electrode 121 are opposite in polarity, they try to fly toward the charging electrode 121 by being attracted by the Coulomb force, but most of the raw material liquid toward the charging electrode 121. The direction of 300 is changed by the gas flow, and the aircraft 300 flies toward the guide body 102.

  The raw material liquid 300 is discharged from the discharge device 101 while manufacturing the nanofiber 301 by the electrostatic stretching phenomenon (nanofiber manufacturing process). Here, since the raw material liquid 300 flows out in a strong charged state (high charge density), electrostatic stretching easily occurs, and most of the raw material liquid 300 that flows out changes to the nanofibers 301. In addition, since the raw material liquid 300 flows out in a strong charged state (high charge density), electrostatic stretching occurs over many orders, and a large amount of nanofibers 301 having a small wire diameter are manufactured.

  Further, the gas flow is heated by the heating device 125, and while guiding the flight of the raw material liquid 300, heat is applied to the raw material liquid 300 to promote evaporation of the solvent and promote electrostatic stretching.

  The nanofibers 301 emitted from the emission device 101 as described above are introduced into the guide body 102. Then, the nanofiber 301 is guided toward the collection device 103 while being conveyed in the gas flow inside the guide body 102 (guide process).

  The nanofibers 301 transported to the diffuser 127 are rapidly reduced in speed and are uniformly dispersed (diffusion process).

  In this state, the suction device 132 arranged behind the deposition target member 128 sucks the gas flow together with the evaporated solvent, and attracts the nanofiber 301 onto the deposition target member 128 (attraction process). In addition, an electric field is generated by the attracting electrode 134 to which a voltage is applied, and the nanofiber 301 is also attracted by the electric field (attraction process).

  As described above, the nanofiber 301 is collected by being separated from the gas flow by the deposition target member 128 (collecting step). Since the member to be deposited 128 is slowly transferred by the winding device 129, the nanofiber 301 is also collected as a long belt-like member extending in the transfer direction.

  The gas flow that has passed through the deposition target 128 is accelerated by the suction device 132 and reaches the recovery device 105. The recovery device 105 separates and recovers the solvent from the gas flow (recovery process).

  By using the nanofiber manufacturing apparatus 100 configured as described above and performing the above nanofiber manufacturing method, the raw material liquid 300 can be supplied without being exposed to air until it flows out from the outflow hole 118, Stable quality raw material liquid 300 can continue to flow into the space, and high-quality nanofibers 301 can be manufactured in a stable state for a long period of time. In addition, the resin in the raw material liquid 300 can be prevented from solidifying in the outflow hole 118, and the number of maintenance operations for removing clogging of the outflow hole 118 can be reduced.

  Further, since the raw material liquid 300 flows out from the outflow holes 118 due to the pressure of the raw material liquid 300 together with the centrifugal force, the raw material liquid 300 flows out from each outflow hole 118 evenly, and the quality of the manufactured nanofibers 301 can be stabilized. It becomes possible.

  Next, in the nanofiber manufacturing apparatus 100 having the above-described configuration, a resin changing method in which the raw material liquid 300 is replaced with a different type and the type of resin constituting the nanofiber 301 is changed will be described.

  First, the operation of the nanofiber manufacturing apparatus 100 is stopped (stop process). Next, the lid 120 is removed from the rotating base 119 of the outflow body 115, and the pressure remaining in the storage chamber 108 is released (pressure release process). As described above, the diameter-expanded portion 126 of the guide tube 114 is reduced in diameter, and the connection state between the shaft body 116 and the guide tube 114 becomes loose.

  Next, the guide tube 114 is removed from the shaft body 116 (extraction process). Thereby, the connection state of the shaft body 116 and the guide tube 114 is released.

  Next, the storage chamber 108 of the outflow body 115 is cleaned. Since the storage chamber 108 is open because the lid 120 is removed, the storage chamber 108 can be easily cleaned. Moreover, since the lid 120 is separated from the nanofiber manufacturing apparatus 100, the lid 120 is washed in a state of being immersed in a solvent (cleaning step).

  Next, a supply device 107 for supplying another type of raw material liquid 300 is prepared, and another guide tube 114 connected to the supply device 107 is inserted into the shaft body 116 (insertion step). The guide tube 114 is inserted until the distal end portion of the guide tube 114 protrudes into the storage chamber 108 of the outflow body 115. The insertion state of the guide tube 114 can be confirmed from the removed lid 120 side.

  Next, the lid 120 is attached to the rotating base 119 (attachment process). The operation preparations are now complete.

  Next, the desired raw material liquid 300 is supplied to the effluent 115 using another supply device 107 and another guide pipe 114 (supply process).

  When the nanofiber manufacturing apparatus 100 described above is used, the raw material liquid 300 can be caused to flow out by the centrifugal force generated by the pressure of the raw material liquid 300 and the outflow body 115 rotating. Therefore, the pressure of the raw material liquid 300 can be suppressed to a relatively low state. As a result, the connection portion between the guide tube 114 and the shaft body 116 and the portion that secures a liquid-tight state (such as the enlarged diameter portion 126), or the connection portion between the shaft body 116 and the outflow body 115 is liquid. The pressure resistance performance of a portion (such as packing 106) that ensures a dense state can be kept low. Therefore, there is no need to firmly connect the guide tube 114 and the shaft body 116, and the structure of the connection portion between the guide tube 114 and the shaft body 116 and the connection portion between the shaft body 116 and the outflow body 115 is simplified. Is possible.

  In addition, since the pressure resistance performance of the guide tube 114 itself can be kept low, a flexible resin tube can be used as the guide tube 114. Therefore, even if the guide tube 114 is disposable, the manufacturing cost of the nanofiber 301 is not significantly affected.

  Further, by providing the outflow body 115 with the lid 120, the storage chamber 108 inside the outflow body 115 can be easily cleaned. Further, since the guide tube 114 is in close contact with the inner wall of the shaft body 116, the raw material liquid 300 is not attached.

  In the present embodiment, the booster 153 supplies air having a pressure slightly higher than the atmospheric pressure (a pressure selected from a pressure range of 1.01 to 3 times the atmospheric pressure).

  From the above, it is possible to easily change the resin constituting the nanofiber 301 and to maintain the nanofiber manufacturing apparatus 100 in a short time, and to improve the production efficiency of the nanofiber 301. .

  The present invention can be used for producing nanofibers, spinning using nanofibers, and producing nonwoven fabrics.

It is a top view which notches and shows a nanofiber manufacturing apparatus partially. It is a top view which notches and shows a part of discharge | release apparatus. It is a perspective view which shows the external appearance of the discharge | release apparatus. It is a figure which cuts off a part of supply apparatus and shows typically. It is another figure which shows the raw material liquid supply timing from a 2nd container. It is a perspective view which shows the other connection state of a guide tube and a shaft body. It is a perspective view which shows the guide body vicinity.

DESCRIPTION OF SYMBOLS 100 Nanofiber manufacturing apparatus 101 Discharge apparatus 102 Guide body 103 Collection apparatus 104 Attraction apparatus 105 Collection apparatus 106 Packing 107 Supply apparatus 108 Storage chamber 109 Bearing 110 Outflow apparatus 111 Charging apparatus 112 Wind tunnel body 113 Blower apparatus 114 Guide pipe 115 Outflow body 116 Axis Body 117 Driving device 118 Outflow hole 119 Rotating base 120 Lid 121 Charging electrode 122 Charging power source 123 Grounding device 124 Wind control body 125 Heating device 126 Expanding portion 127 Diffuser 128 Deposited member 129 Winding device 130 Member supply device 131 Concentration Body 132 suction device 133 electric field attraction device 134 attraction electrode 135 attraction power source 136 sealing member 141 weight measurement device 142 control device 143 gas attraction device 151 container 152 second container 153 booster 154 base 155 transfer device 156 guide Outlet pipe 157 Introduction pipe 158 Gas introduction pipe 159 On-off valve 161 Pressure source 162 Regulating valve 300 Raw material liquid 301 Nanofiber

Claims (9)

A nanofiber manufacturing apparatus for manufacturing nanofibers by electrically stretching a raw material liquid in a space,
A supply device for feeding and supplying the raw material liquid;
A guide tube for guiding the raw material liquid fed from the supply device;
A hollow outflow body that causes the raw material liquid supplied from the guide tube to flow out into the space by the pressure of the raw material liquid and its rotation,
A shaft that is connected to the outflow body in a rotatable and liquid-tight state, the guide tube is inserted therein, and is connected to the guide tube in a liquid-tight state;
A driving device for rotating the outflow body;
A nanofiber manufacturing apparatus, comprising: a charging device that charges the raw material liquid with charge through the effluent.   The nanofiber manufacturing apparatus according to claim 1, wherein the guide tube is detachable from the shaft body. The nanofiber manufacturing apparatus according to claim 1, wherein the guide tube and the shaft body are connected in a liquid-tight state via a sealing member disposed so as to surround an outer periphery of the guide tube. The guide tube is disposed in the shaft body and has a diameter-expanding portion that expands due to the pressure of the raw material liquid.
The nanofiber manufacturing apparatus according to claim 1, wherein the guide tube and the shaft body are connected in a liquid-tight state by expanding the diameter-expanding portion. The effluent is
A cylindrical rotating base that is restricted in relative movement with the shaft body in the axial direction and is rotatably connected to the shaft body;
The nanofiber manufacturing apparatus according to claim 1, further comprising a lid that is detachably attached to the rotating base and that is connected to the guide tube and closes a storage chamber that stores the raw material liquid so as to be openable and closable. The supply device includes:
A container for storing the raw material liquid and having airtightness;
A pressure increasing device that introduces gas into the container and raises the pressure in the container;
2. The nanofiber according to claim 1, further comprising: a tubular outlet tube in which one open end is immersed in the raw material solution, the other open end is disposed outside the container, and is attached to the container in an airtight state. Manufacturing equipment. The supply device further includes
A second container having a larger capacity than the container;
The nanofiber manufacturing apparatus according to claim 6, further comprising a transfer device that transfers the raw material liquid from the second container to the container. further,
A collection device for collecting nanofibers produced in space;
The nanofiber manufacturing apparatus according to claim 1, further comprising an attracting device that attracts nanofibers to the collecting device. A supply device that feeds and feeds the raw material liquid, a guide tube that guides the raw material liquid fed from the supply device, and the raw material liquid that is supplied from the guide tube is separated by the pressure of the raw material liquid and its rotation. A hollow outflow body that is allowed to flow in, a shaft body that is connected to the outflow body in a rotatable and liquid-tight state, the guide tube is inserted therein, and is connected to the guide tube in a liquid-tight state; A driving device that rotates the outflow body, and a charging device that charges the raw material liquid through the outflow body and charges the raw material liquid, and electrically stretches the raw material liquid in space to manufacture nanofibers. In the nanofiber manufacturing apparatus, a resin changing method for changing the type of resin constituting the nanofiber,
Removing the guide tube from the shaft body;
Insert another guide tube connected to another supply device into the shaft body,
A resin changing method for supplying a raw material liquid with the other supply device and another guide tube.

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