JP2008303496A - Device for producing nanofiber, apparatus for producing nonwoven fabric, and method for producing nanofiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of producing high-quality nanofibers. <P>SOLUTION: The device 180 for producing the nanofibers includes a jetting means 110 having jetting holes 112 for jetting a raw material liquid 200 for producing the nanofibers and a collection electrode 120 for collecting the nanofibers 200 produced to be jetted from the jetting holes 112. The jetting means 110 is grounded and the voltage across the jetting means 110 and the collection electrode 120 is regulated to ≥10 to ≤200 kV with a power source 150. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus and a method for producing a nanofiber made of a polymer material. Moreover, it is related with the manufacturing apparatus of the nonwoven fabric comprised with a nanofiber.

  An electrospinning method is known as a method for producing a filamentous material (hereinafter referred to as “nanofiber”) made of a polymer material and having a submicron-scale diameter.

  This electrospinning method is a method in which a polymer solution in which a polymer substance is dispersed in a solvent is ejected (outflowed) from a needle-like nozzle to which a high voltage is applied to a collector (collecting electrode) toward the collector. This is a method for obtaining a nanofiber.

  More specifically, the charged polymer solution is injected into the space by setting the injection nozzle to a high voltage, and the charge density of the polymer solution flying in the space increases as the solvent evaporates. A phenomenon (electrostatic explosion) in which the polymer solution is explosively stretched linearly occurs when the repulsive Coulomb force generated in the polymer solution exceeds the surface tension of the polymer solution. This electrostatic explosion occurs one after another in the space, so that nanofibers made of a polymer having a submicron diameter are manufactured.

  In addition, by depositing nanofibers manufactured by the above-mentioned method on a substrate, a three-dimensional thin film having a three-dimensional network can be obtained, and by forming a thicker film, a high thickness having a submicron network can be obtained. A porous web (nonwoven fabric) can be produced.

  The web produced by employing the electrospinning method as described above has a high porosity composed of nano-order pores and has a large surface area as a whole, so that it is a filter, a separator for a battery, and a polymer electrolyte membrane for a fuel cell. It is expected to obtain a high effect when applied to electrodes and electrodes.

  Conventionally, as a method for producing a large amount of nanofibers to produce a practical web made of nanofibers, an apparatus for producing a web by arranging a plurality of nozzles in parallel and depositing a large amount of nanofibers has been proposed. (For example, refer to Patent Document 1).

The apparatus applies a high voltage of 5 KV or more between the nozzle and the collector, and grounds the collector or applies a voltage having a polarity opposite to that of the nozzle to manufacture the nanofiber.
JP 2002-201559 A

  However, conventionally, as described in Patent Document 1, it has been considered that the polymer solution is charged by causing the nozzle to have a high voltage (for example, 5 KV or more), and electrostatic explosion occurs.

  Therefore, in order to maintain the nozzle at a high voltage, a high withstand voltage insulation is provided between members around the nozzle, and for safety reasons, the entire nozzle that is at a high voltage is surrounded and covered by human hands. And so on.

  However, since the nozzle is a part for injecting the raw material liquid for producing the nanofiber as described above, a pipe and a tank for supplying the raw material liquid are connected to the nozzle, and the raw material liquid is pumped. The pump is connected to do. The pressure and temperature of the raw material liquid are monitored using a sensor, and information from the sensor is analyzed by a computer and used for feedback control and the like.

  Therefore, it is necessary to insulate the entirety including the nozzle so as to withstand a high voltage, and it is necessary to select components capable of withstanding the high voltage. Accordingly, the structure of the entire apparatus becomes complicated and the price increases.

  Furthermore, the present inventors have found that the enclosure covering the nozzle is a factor hindering the quality improvement of the nanofiber in the course of research aimed at improving the quality of the manufactured nanofiber. The mechanism by which the enclosure affects the quality of nanofibers is considered as follows.

  That is, the enclosure covering the high voltage member such as the nozzle is charged by the high voltage nozzle or the like. Then, dust in the air is sucked by the charging, and when the predetermined condition is satisfied, the sucked dust moves away from the enclosure at high speed. In this way, ionic wind is generated, which affects the nanofibers from which the dust and wind are produced.

  In addition, dust and debris charged with high voltage generated by the ion wind adhere to peripheral devices, destroying parts and semiconductor elements used in the peripheral devices, and making the device unusable. In some cases. Further, when a high voltage is applied to the tip of the nozzle, electric lines of force are generated from the nozzle toward the enclosure that covers the nanofiber manufacturing apparatus, and the generated charged dust or dirt is generated. And the like move and adhere to the enclosure or the like along the lines of electric force with a tremendous momentum. In this way, charged dust and debris attached to peripheral devices and incidental equipment maintain a high voltage, and have a great influence on the nanofiber itself charged to the same polarity generated from the nozzle. It will lead to hindrance to collection and decrease in collection rate.

  Furthermore, when the charged dust or dirt gathers at a predetermined place, the place becomes a high potential, and a phenomenon occurs in which a discharge occurs instantaneously and a spark occurs. In such a case, when an organic solvent is used in the raw material liquid, there is a risk that the generated spark is triggered and ignites. .

  The present invention has been made in view of the above problems, and aims to provide a nanofiber manufacturing apparatus and the like that can avoid the influence of nanofiber manufacturing due to the enclosure as much as possible and can be realized with a simple apparatus configuration. To do.

  In order to achieve the above object, a nanofiber manufacturing apparatus according to the present invention includes an injection means having an injection hole for injecting a raw material liquid for producing nanofibers, and a collection for collecting and manufacturing nanofibers injected from the injection hole. A nanofiber manufacturing apparatus comprising: an electrode; a first power source that applies a potential selected from a range of −200 KV or more and −10 KV or less, or +10 KV or more and +200 KV or less to the collection electrode; And a second power source that applies a potential selected from a range of −1 KV or more and +1 KV or less. Further, a nanofiber manufacturing apparatus comprising: an injection means having an injection hole for injecting a raw material liquid for producing nanofibers; and a collection electrode for collecting nanofibers injected and manufactured from the injection holes, wherein the collection electrode To the first power source for applying a potential selected from the range of −200 KV or more, −10 KV or less, or +10 KV or more and +200 KV or less, and grounding that connects the spraying unit and the ground and uses the spraying unit as a ground potential. Means.

  According to the above, since the potential difference between the jetting means and the members existing in the vicinity is small or eliminated, the withstand voltage of the insulation applied to the jetting means can be lowered or the insulation can be omitted, and the structure of the jetting means is simplified. be able to. In addition, since the potential difference between the ejection unit and the member existing in the vicinity is small or eliminated, the influence of the member on the electric field (electric lines of force) generated between the ejection unit and the collecting electrode can be reduced. It becomes possible. Furthermore, since the potential difference between the jetting means and the members existing in the vicinity is small or eliminated, corona discharge from the members can be suppressed.

  Furthermore, the injection means includes a rotator into which the raw material liquid is introduced and a drive source that rotates the rotator, and the rotator includes the raw material liquid to which centrifugal force is applied by the rotation of the rotator. It is preferable that the injection holes are provided radially around the rotation axis so that the injection can be performed.

  Thereby, even if it is an injection means provided with a rotation part, while insulation can be simplified or abbreviate | omitted and a structure can be simplified, it becomes possible to manufacture a lot of nanofibers.

  Moreover, if it is a nonwoven fabric manufacturing apparatus provided with the said nanofiber manufacturing apparatus, it can enjoy the said effect and can manufacture a high quality nonwoven fabric.

  Further, the above object is applied to a nanofiber manufacturing apparatus including an injection unit having an injection hole for injecting a raw material liquid for producing nanofibers, and a collecting electrode for collecting the nanofibers injected and manufactured from the injection holes. In the nanofiber manufacturing method, the potential of the ejection unit is set in a range of −1 KV or more and +1 KV or less, and the potential with the collection electrode is −200 KV or more, −10 KV or less, or +10 KV or more and +200 KV or less. A nanofiber manufacturing method for obtaining nanofibers by flying the raw material liquid in an electric field generated by the potential state, or an injection means having an injection hole for injecting a raw material liquid for nanofiber manufacturing; Nanofiber applied to a nanofiber manufacturing apparatus comprising a collecting electrode for collecting nanofiber produced by injection from an injection hole In the manufacturing method, the ejecting means is grounded, and the potential of the collecting electrode is set in a range of −200 KV or higher and −10 KV or lower, or +10 KV or higher and +200 KV or lower, and the electric field generated by the potential state is set in the electric field. This can be achieved by a nanofiber manufacturing method for obtaining nanofibers by flying a raw material liquid, and the same effects as described above can be achieved.

  ADVANTAGE OF THE INVENTION According to this invention, while improving the performance of the nanofiber manufactured, it becomes possible to provide the nanofiber manufacturing apparatus which ensures high safety | security and makes a structure simple.

  Next, an embodiment of a nonwoven fabric manufacturing apparatus including the nanofiber manufacturing apparatus according to the present invention will be described.

FIG. 1 is a perspective view schematically showing a non-woven fabric manufacturing apparatus according to the present invention.
As shown in the figure, the nonwoven fabric manufacturing apparatus 100 includes a nanofiber manufacturing apparatus 180 composed of an injection unit 110 and a collecting electrode 120, and a sheet 160 as a deposition target. In addition, since the raw material liquid to be injected and the nanofiber being manufactured cannot be clearly distinguished, the reference numeral 200 is assigned to each, and the manufactured nonwoven fabric is assigned 210.

  The injection means 110 is an apparatus having an injection hole for injecting (outflowing) a raw material liquid for producing nanofibers. The injection means 110 is connected to the earth 101 via the grounding means 102 or via the second power supply 151. Connected to ground 101. In the figure, it is described that the connection can be made via any of them. However, the present invention is not limited to this. A pipe 111 connected to a tank (not shown) for storing the raw material liquid is connected to the injection means 110 so that the raw material liquid is supplied at a predetermined pressure.

  The collection electrode 120 is connected to a power source 150 as a first power source so that a predetermined voltage is applied to the ejection unit 110 and is a device for collecting the manufactured nanofibers 200.

  The power source 150 generates a voltage between the ground 101 and the collecting electrode 120. When the ejecting unit 110 is directly connected to the ground 101, a predetermined voltage is applied to the ejecting unit 110. Will be applied.

  Examples of polymer materials for producing nanofibers include polypropylene, polyethylene, polystyrene, polyethylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly-m-phenylene terephthalate, poly-p-phenylene isophthalate, polyvinylidene fluoride, Polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinyl chloride, polyvinylidene chloride-acrylate copolymer, polyacrylonitrile, polyacrylonitrile-methacrylate copolymer, polycarbonate, polyarylate, polyester carbonate, nylon, aramid, polycaprolactone, Examples include polylactic acid, polyglycolic acid, collagen, polyhydroxybutyric acid, polyvinyl acetate, and polypeptide. . Further, the polymer material used for the nanofiber production is not limited to one type, and any plurality of types may be selected from the exemplified polymer materials.

  Moreover, as a solvent used in order to manufacture the raw material liquid, methanol, ethanol, 1-propanol, 2-propanol, hexafluoroisopropanol, tetraethylene glycol, triethylene glycol, dibenzyl alcohol, 1,3-dioxolane, , 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, propyl benzoate, methyl acetate, ethyl acetate, propyl acetate, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, methyl chloride, ethyl chloride, methyl chloride , Chloroform, o-chlorotoluene, p-chlorotoluene, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, trichloroethane, dichloropropane, dibromoethane, dibromopropane, methyl bromide, ethyl bromide, odor Propyl chloride, acetic acid, benzene, toluene, hexane, cyclohexane, cyclohexanone, cyclopentane, o-xylene, p-xylene, m-xylene, acetonitrile, tetrahydrofuran, N, N-dimethylformamide, pyridine, water, etc. it can. Moreover, the solvent used for the nanofiber production is not limited to one type, and any plurality of types may be selected from the above exemplified solvents and mixed and used.

  Moreover, you may mix an inorganic solid material in a raw material liquid. These inorganic solid materials function as an aggregate of the nanofiber to be manufactured, or function as a catalyst or the like supported on the nanofiber. Examples of the inorganic solid material include oxides, carbides, nitrides, borides, silicides, fluorides, and sulfides. Moreover, it is preferable to use an oxide from the viewpoints of heat resistance, workability, and the like.

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 O ₃ , Yb ₂ O ₃ , HfO ₂ , Nb ₂ O _{5 and the} like can be exemplified, and at least one selected from these can be used, but is not particularly limited thereto.

  Further, the resin material forming the nanofibers may be not only the above-mentioned polymer substance but also a low-molecular substance. Even in the case of a low molecular weight substance, the content of the raw material liquid is not different from that of the high molecular weight substance. In this case, the nanofibers are not in a continuous state for a long time, but are produced in the form of fine particles. As an application example of such fine-particle nanofibers, there can be considered a case where a pigment of an organic EL or a liquid crystal color filter is dissolved in a solvent to refine the pigment itself.

  The sheet 160 is a member on which the nanofibers 200 manufactured in the space are to be deposited, and is a thin and flexible long sheet made of a material that can be easily separated from the deposited nanofibers 200. . The sheet 160 is supplied in a state of being wound in a roll shape, and slowly moves in the direction of the arrow in the drawing by the moving means 170 through the portion where the nanofibers 200 are deposited. And it rolls around with the nonwoven fabric 210 manufactured on the sheet | seat 160 again in roll shape.

  The moving means 170 is a device capable of feeding the sheet 160 in one direction while maintaining a predetermined tension, and moves the sheet 160 by rotating a roller shown in the drawing by driving a motor (not shown) or the like. Is.

FIG. 2 is a diagram illustrating a potential relationship of the nanofiber manufacturing apparatus 180.
The injection means 110 is set to a potential selected from the region B (−1 KV to +1 KV) shown in FIG.

  The collecting electrode 120 has a potential selected from the region A (+10 KV to +200 KV) or the region C (−200 KV to −10 KV) shown in FIG.

  If the electric potential of the ejecting means 110 is set to be less than −1 KV or higher than +1 KV, it is difficult to avoid the generation of ion wind when the ejecting means 110 has a sharp pointed portion or the like. In addition, it is necessary to cope with advanced insulation processing.

  If the potential of the collecting electrode 120 is set to a range higher than −10 KV and lower than +10 KV, the potential difference with the collecting electrode 120 becomes insufficient, and it becomes difficult to manufacture a desired nanofiber. Further, when the potential of the collection electrode 120 is set higher than +200 KV or less than −200 KV, even if the collection electrode 120 has a relatively smooth surface and a large amount, abnormal discharge or ion wind from the collection electrode 120, the collection electrode The charging of the members arranged in the vicinity of 120 cannot be ignored, which adversely affects the production of nanofibers.

  Note that there are various modes of the ejecting means 110 and the collecting electrode 120, and there are various combinations of these modes. In FIG. 1, the ejecting means 110 and the collecting electrode 120 are symbolically indicated by a one-dot chain line, and specific embodiments thereof will be specifically described in the embodiments described later.

FIG. 3 is a diagram illustrating a specific example of the ejection unit and the collection electrode.
FIG. 4 is a cross-sectional view showing the rotary cylinder.

  Note that FIG. 3 shows the ejection means 110 larger in order to show the relationship between the ejection means 110 and the collection electrode 120, but in reality, the diameter of the collection electrode 120 is several meters, The diameter of the rotary cylinder 116 is about several centimeters to several tens of centimeters.

  The collecting electrode 120 has a cylindrical shape and can rotate with the movement of the sheet 160 or synchronously. The collecting electrode 120 has a rounded chamfer at the cylindrical edge portion so that the diameter gradually decreases toward the end surface of the collecting electrode 120.

  In this way, by making the peripheral edge of the collecting electrode 120 desired from the ejecting means 110 a curved surface that moves away from the ejecting means 110, the disturbance of the electric field due to the edge of the collecting electrode 120 is suppressed, and the deposition state of the nanofiber 200 is improved. It can be.

  As shown in FIG. 3, the injection unit 110 is a device that injects (flows out) the raw material liquid by centrifugal force, and serves as a rotary shaft that is also used as the rotary cylinder 116 and the pipe 111 for supplying the raw material liquid 200. A shaft 117, a motor 118, a base body 119, a belt 115, and a pulley 114 are provided.

  The rotary cylinder 116 is radially provided with a plurality of nozzles 113 each having an injection hole 112 on a cylindrical peripheral wall sealed at one end. A shaft 117 is attached to the central portion of the other end of the rotary cylinder 116. The rotary cylinder 116 is rotatably attached to the base body 119 via a shaft 117.

  The motor 118 and the pulley 114 fixed to the shaft 117 are connected by a belt 115, and the motor 118 is attached to the base 119. By rotating the motor 118, the rotary cylinder 116 can be rotated relative to the base body 119.

  Further, as shown in FIG. 4, the shaft 117 and the other end of the rotary cylinder 116 are connected so that liquid can be inserted. The shaft 117 and the rotary cylinder 116 are both made of a conductor, and the connection with the shaft 117 is connected to the ground 101 via the grounding means 102 using the brush 203 and is grounded. Accordingly, the rotary cylinder 116 is also grounded via the shaft 117. Further, since the brush 203 is used, the ground potential can be maintained even when the rotary cylinder 116 is in a rotating state.

  The rotary cylinder 116 is connected via a shaft 117 to a tank 202 in which the raw material liquid 200 is stored. A pump 201 is attached on the flow path of the raw material liquid 200 so that the raw material liquid 200 can be pumped toward the rotary cylinder 116.

  Next, a manufacturing method of the nanofiber 200 by the nanofiber manufacturing apparatus 180 configured by the ejection unit 110 and the collecting electrode 120 and a manufacturing method of the nonwoven fabric in which the manufactured nanofiber 200 is deposited to manufacture the nonwoven fabric will be described. .

  First, the raw material liquid 200 is pumped from the tank 202 of the raw material liquid 200 toward the rotary cylinder 116. In the case of the present embodiment, since the raw material liquid 200 is not injected by the pressure, the pressure of pressure feeding is relatively low.

  The raw material liquid 200 is injected into the rotary cylinder 116 through the shaft 117 (pipe 111). The rotary cylinder 116 is rotated by a motor 118, and the injected raw material liquid 200 also generates a centrifugal force due to the rotation. Then, the raw material liquid 200 is radially ejected to the outside of the rotary cylinder 116 by centrifugal force through holes formed in the peripheral wall of the rotary cylinder 116.

  Since the raw material liquid 200 is injected from the rotating injection holes 112, even if there is some variation in the shape of each injection hole 112, the raw material liquid 200 is injected in an equal amount when the entire space is combined. If the injection means 110 as described above is employed, a relatively large amount of nanofibers 200 can be manufactured at once and homogeneously, and the nonwoven fabric 210 in which the manufactured nanofibers are evenly distributed can be manufactured. It becomes possible.

  On the other hand, a voltage selected from the range of +10 KV or higher and +200 KV or lower, or −10 KV or lower and −200 KV or higher is applied to the collecting electrode 120 by the power supply 150. Inductive charges corresponding to the voltage of the collecting electrode are generated in the rotary cylinder 116 disposed opposite to the collecting electrode 120, and an electric field (electric field lines) is generated between the rotary cylinder 116 and the collecting electrode 120. To do.

  In the above state, since the raw material liquid 200 is injected from the rotary cylinder 116, the raw material liquid 200 is given an electric charge necessary for electrostatic explosion and is also supplied along the electric field (electric lines of force). The nanofibers 200 are manufactured by repeating electrostatic explosions.

  Since the manufactured nanofiber 200 is deposited on the sheet 160 and the sheet 160 gradually moves, a long nonwoven fabric is manufactured on the sheet 160.

  As described above, the motor 118, the base 119, the pipe 111 constituting the path for supplying the raw material liquid 200, the raw material liquid tank 202, the pump 201, and the like are at the ground potential, and therefore the injection unit 110 is maintained at a high voltage. There is no need to provide advanced insulation. Therefore, as in the present embodiment, the injection unit 110 can simply include a mechanism for injecting the raw material liquid 200 by rotation. Moreover, it is not necessary to attach the motor 118 and the sensor connected to the tank of the raw material liquid 200 in an insulated state. Therefore, the entire configuration of the ejection unit 110 can be simplified. In other words, the injection means 110 having a simple structure can easily obtain high durability and reliability, and has a high degree of freedom in design. Moreover, it can contribute to reduction of manufacturing cost and maintenance cost.

  Further, even if an enclosure is provided around the ejection unit 110, the ejection unit 110 is connected to the earth 101 and has a ground potential, so that the enclosure connected to the earth 101 is not charged. Therefore, it is considered that no ion wind is generated from the enclosure and no corona discharge occurs. Therefore, the quality of the manufactured nanofiber can be improved.

  In the present embodiment, the ejection unit 110 is connected to the ground 101 to obtain a ground potential. However, the second power source 151 may be connected to the ejection unit 110 to apply a voltage in the range of −1 KV to +1 KV. By applying a relatively low voltage to the ejection unit 110, it is possible to stabilize the potential of the ejection unit 110 with respect to the ground potential, and to stabilize the electric field (electric field lines) generated between the collection electrode 120. be able to. In this case, the potential difference (absolute value) between the ground 101 and the ejection unit 110 is preferably smaller than the potential difference (absolute value) between the ground 101 and the collecting electrode 120. Furthermore, the potential difference (absolute value) between the ground 101 and the collecting electrode 120 is preferably set to be three times or more of the potential difference (absolute value) between the ground 101 and the ejection unit 110. By setting the potential in this way, it is possible to suppress the charging of the members existing around the ejection unit 110 and reduce the influence on the nanofiber due to ion wind or corona discharge.

  In FIGS. 1 and 2, the ejection unit 110 is fixed. However, the ejection unit 110 is provided with a movement unit so that the ejection unit 110 is periodically or predetermined in a direction substantially perpendicular to the movement direction of the sheet 160. You may move by an operation pattern. By doing so, even if the width of the sheet 160 is increased, the nanofibers 200 can be deposited over the entire width on the sheet 160.

  Further, as described above, even when the ejecting means 110 is moved using a motor or the like, it is not necessary to provide high-level insulation to these moving mechanisms and electronic parts for controlling the moving mechanism. It is possible to avoid the destruction of electronic parts and semiconductors used for the above.

  1 and 2, only one injection unit 110 is shown. However, if a plurality of injection units 110 are arranged side by side, the width of the sheet 160 is increased or the thickness to be deposited is increased. Is an effective means.

  Note that the ejection unit 110 is not limited to the structure described in the above embodiment. For example, as shown in FIGS. 5A and 5B, a rotary cylinder that rotates on an axis parallel to the collection electrode 120 may be provided. A second power supply 151 is connected to the rotary cylinder 116 shown in the figure, and a voltage is applied in the range of −1 KV to +1 KV. In this case, the setting of the second power supply 151 may be set to 0 V, and the rotary cylinder 116 may be maintained at the same potential as the ground potential.

  Further, as shown in FIG. 6, the nozzle 113 may be fixedly arranged with respect to the collecting electrode 120. In this case, by disposing the plurality of nozzles 113 obliquely with respect to the moving direction of the sheet 160, the interval between the nozzles 113 can be widened, and the nanofibers 200 are uniformly deposited on the sheet 160. Is possible.

  Further, the collecting electrode 120 is not limited to the structure described in the above embodiment. The collecting electrode 120 may be a simple flat plate shown in FIG. 5, or may be a member having a shape with a rounded edge as shown in FIG.

  Furthermore, as shown in FIG. 7, the positional relationship between the collecting electrode 120 and the ejection unit 110 may be arranged in a horizontal plane. If arranged in this way, the raw material liquid 200 that is flying in a lump shape without becoming nanofibers falls by gravity before reaching the collecting electrode 120, so that the quality of the manufactured nanofibers 200 and nonwoven fabrics 210 is improved. It becomes possible to improve.

  Further, a reflection plate 131 may be provided on the opposite side of the collecting electrode 120 with respect to the rotary cylinder 116, and a voltage having a polarity opposite to that of the collecting electrode 120 may be applied using the third power source 152. By including the reflection plate 131 that can control the voltage to be applied in this manner, the state of the electric field can be controlled to some extent, and the flight path and the deposition state of the nanofiber can be controlled. . In addition, since the reflector 131 is fixedly attached and can be arbitrarily selected in shape or the like, it can be easily insulated without any structural difficulty.

  Further, instead of the reflection plate 131, a blowing unit may be provided to send the generated nanofibers 200 toward the collection electrode 120.

  The present invention can be used for manufacturing nanofibers, and in particular, can be used for manufacturing spinning and nonwoven fabrics using nanofibers.

It is a perspective view showing roughly the nonwoven fabric manufacturing device concerning the present invention. It is a figure which shows the electric potential relationship of a nanofiber manufacturing apparatus. It is a figure which shows the specific example of an injection means and a collection electrode. It is sectional drawing which shows a rotary cylinder. It is a figure which shows the other aspect of an injection means and a collection electrode, (a) is a perspective view, (b) is sectional drawing. It is a perspective view which shows the other aspect of an injection means and a collection electrode. It is a figure which shows the other aspect of an injection means and a collection electrode, (a) is a perspective view, (b) is sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Nonwoven fabric manufacturing apparatus 101 Earth 102 Grounding means 110 Injection means 111 Pipe 112 Injection hole 113 Nozzle 114 Pulley 115 Belt 116 Rotary cylinder 117 Shaft 118 Motor 119 Base 120 Collection electrode 131 Reflector 150 Power supply 151 Second power supply 152 Third power supply 160 Sheet 170 moving means 180 nanofiber manufacturing apparatus 200 nanofiber 200 raw material liquid 201 pump 202 tank 203 brush 210 non-woven fabric

Claims (7)

A nanofiber manufacturing apparatus comprising: an injection means having an injection hole for injecting a raw material liquid for producing nanofibers; and a collecting electrode for collecting nanofibers injected and manufactured from the injection holes,
A first power source for applying a potential selected from a range of −200 KV or more and −10 KV or less, or +10 KV or more and +200 KV or less to the collection electrode;
A nanofiber manufacturing apparatus comprising: a second power source that applies a potential selected from a range of -1 KV or more and +1 KV or less to the ejection unit. A nanofiber manufacturing apparatus comprising: an injection means having an injection hole for injecting a raw material liquid for producing nanofibers; and a collecting electrode for collecting nanofibers injected and manufactured from the injection holes,
A first power source that applies a potential selected from a range of −200 KV or more and −10 KV or less, or +10 KV or more and +200 KV or less to the collection electrode;
An apparatus for producing nanofibers, comprising: grounding means for connecting the jetting means and ground and setting the jetting means to ground potential. The injection means includes a rotator into which the raw material liquid is introduced, and a drive source that rotates the rotator.
The nanofiber manufacturing according to claim 1 or 2, wherein the rotating body is provided with the injection holes radially about a rotation axis so that the raw material liquid to which a centrifugal force is applied by rotation of the rotating body can be injected. apparatus. A non-woven fabric manufacturing apparatus comprising an injection means having an injection hole for injecting a raw material liquid for producing nanofibers, and a collecting electrode for collecting nanofibers injected and manufactured from the injection holes,
A deposition means disposed on the injection hole side of the collecting electrode and holding the manufactured nanofibers in a deposited state;
Moving means for moving the deposition means in a predetermined direction;
A first power source that applies a potential selected from a range of −200 KV or more and −10 KV or less, or +10 KV or more and +200 KV or less to the collection electrode;
A non-woven fabric manufacturing apparatus comprising: a second power source that applies a potential selected from a range of -1 KV or more and +1 KV or less to the ejection unit. A non-woven fabric manufacturing apparatus comprising an injection means having an injection hole for injecting a raw material liquid for producing nanofibers, and a collecting electrode for collecting nanofibers injected and manufactured from the injection holes,
A deposition means disposed on the injection hole side of the collecting electrode and holding the manufactured nanofibers in a deposited state;
Moving means for moving the deposition means in a predetermined direction;
A first power source that applies a potential selected from a range of −200 KV or more and −10 KV or less, or +10 KV or more and +200 KV or less to the collection electrode;
A non-woven fabric manufacturing apparatus comprising: a grounding unit that connects the spraying unit and a ground and sets the spraying unit to a ground potential. A nanofiber manufacturing method applied to a nanofiber manufacturing apparatus, comprising: an injection means having an injection hole for injecting a raw material liquid for producing nanofibers; and a collecting electrode for collecting the nanofibers injected and manufactured from the injection holes. And
Setting the potential of the ejection means in a range of -1 KV or more and +1 KV or less;
The potential with the collection electrode is set in a range of −200 KV or more and −10 KV or less, or +10 KV or more and +200 KV or less,
A nanofiber manufacturing method for obtaining nanofibers by flying the raw material liquid in an electric field generated by the potential state. A nanofiber manufacturing method applied to a nanofiber manufacturing apparatus, comprising: an injection means having an injection hole for injecting a raw material liquid for producing nanofibers; and a collecting electrode for collecting the nanofibers injected and manufactured from the injection holes. And
Grounding the jetting means;
The potential of the collecting electrode is set to a range of −200 KV or more and −10 KV or less, or +10 KV or more and +200 KV or less,
A nanofiber manufacturing method for obtaining nanofibers by flying the raw material liquid in an electric field generated by the potential state.

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