JP4907571B2 - Nanofiber manufacturing equipment, non-woven fabric manufacturing equipment - Google Patents

Description

  The present invention relates to a nanofiber manufacturing apparatus that manufactures nanofibers using an electrospinning method (electrostatic explosion), and a non-woven fabric manufacturing apparatus that manufactures nonwoven fabrics by depositing nanofibers manufactured by an electrospinning method.

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

  This electrospinning method is a method in which a raw material liquid in which a polymer substance or the like is dispersed or dissolved in a solvent is ejected (discharged) into the space, and a charge is imparted to the raw material liquid to charge it. In this method, nanofibers are obtained by electrostatic explosion of a liquid.

  More specifically, the volume of the raw material liquid decreases as the solvent evaporates from the particles of the raw material liquid in flight, but the charge imparted to the raw material liquid is maintained. The charge density of the grains increases. Since the solvent continuously evaporates, the charge density of the raw material liquid particles is further increased, and the polymer is rebounded when the repulsive Coulomb force generated in the raw material liquid grains exceeds the surface tension of the raw material liquid. A phenomenon (electrostatic explosion) in which the solution is stretched linearly occurs. This electrostatic explosion is generated in a spiral manner one after another in the space, thereby producing a nanofiber made of a polymer having a submicron diameter (for example, see Patent Document 1).

  When nanofibers manufactured by the electrospinning method are used as raw materials for yarns and nonwoven fabrics, it is necessary to collect a large amount of nanofibers at high density. For this purpose, for example, Patent Document 2 describes an invention in which a large number of nanofibers are manufactured at a high density by arranging a large number of nozzles for injecting a raw material liquid toward an electrode for collecting the nanofibers.

  However, when a large number of nozzles are arranged toward a collecting means for collecting nanofibers, the number of nozzles arranged per unit area is limited, so that the density of nanofibers that can be collected cannot be increased so much.

Therefore, a cylindrical container having a large number of injection ports on the peripheral wall is arranged so that the direction of collecting the nanofibers coincides with the axis of the container, and the container is rotated at high speed using the axis as a rotation axis. In order to change the flight direction of the raw material liquid injected in the direction intersecting the direction of collecting the nanofibers to the direction of collecting the nanofibers. The invention concerning the invention is changed and another application for the invention is filed.
Japanese Patent Laying-Open No. 2005-330624 JP 2002-201559 A

  However, as a result of further experiments and research on the above-described invention, the present invention is found out that the form of the support for supporting the rotating container affects the production state of the nanofiber and the collection state of the nanofiber. It came to.

  That is, this invention aims at provision of a nanofiber manufacturing apparatus provided with the support body provided with the form which is hard to influence the manufacture state of a nanofiber, and the collection state of a nanofiber.

  The nanofiber manufacturing apparatus that can achieve the above object includes an injection unit that injects a raw material liquid, which is a raw material of nanofibers, into a space, a charging unit that imparts an electric charge to the raw material liquid, and the injection unit And a gas flow generating means for generating a gas flow for guiding the manufactured nanofiber, and the injection means has an injection port on a peripheral wall and injects the raw material liquid by centrifugal force A cylindrical injection container that is disposed upstream of the gas flow with respect to the injection port and has a thickness perpendicular to the direction of flow of the gas flow that is smaller than the diameter of the injection container to support the injection means It is characterized by comprising a support body.

  As a result, the support can support the ejecting means without disturbing the gas flow as much as possible. As a result, since the nanofibers are guided by the gas flow without being disturbed in the space, it becomes possible to collect the nanofibers in a stable state, and it is possible to provide the nanofibers in a uniform and high-quality state. Become.

  The support preferably includes a streamlined streamline portion on the upstream side of the gas flow.

  Thereby, it becomes possible to further suppress the influence on the gas flow.

  In addition, it is preferable that the ejection unit is supported by a plurality of supports, and the total thickness of the support in the direction perpendicular to the gas flow direction is smaller than the diameter of the ejection container.

  According to this, it becomes possible to support an injection means from many directions, the influence with respect to a gas flow can be prevented as much as possible, and the vibration of an injection means provided with the rotating injection container is suppressed effectively. It is also possible to adopt an aspect.

  Further, the support is preferably a fin that controls the flow of the gas flow. Thereby, it is possible to prevent the gas flow from reaching a predetermined portion, for example, the vicinity of the injection port of the injection container, and in addition, it can be expected that the turbulent gas flow is rectified by the support.

  Moreover, it is preferable that the said support body is equipped with the raw material liquid supply path which supplies a raw material liquid to the said injection container inside.

  Thereby, the factors that disturb the gas flow other than the support can be reduced as much as possible, which contributes to the uniformity of nanofiber collection and the like.

  Moreover, since it becomes possible to deposit nanofiber uniformly and thickly if it is set as the nonwoven fabric manufacturing apparatus provided with the said nanofiber manufacturing apparatus, it becomes possible to obtain the nonwoven fabric of a desired characteristic easily.

  If the nanofiber production apparatus and the nonwoven fabric production apparatus provided with the support of the present invention are used, the influence of the nanofiber production state and the nanofiber collection state by the support is avoided as much as possible, and the nanofiber is stably maintained. Can be manufactured.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view schematically showing a nonwoven fabric production apparatus according to an embodiment of the present invention.

  As shown in the figure, the nonwoven fabric manufacturing apparatus 100 includes a nanofiber manufacturing apparatus 200, a collection body 101, a suction means 102, a region regulating means 103, a transport means 104, a suction control means 105, and a solvent recovery apparatus. 106.

  The collection body 101 is a member on which nanofibers manufactured in the space are to be deposited. The collection body 101 has air permeability to collect the nanofibers guided by a gas flow (shown as 204 in FIG. 1). It is made into a member. In the case of the present embodiment, the collection body 101 is a thin and flexible long sheet-like member made of a material that can be easily separated from the deposited nanofibers. Specifically, as the collection body 101, a long net made of aramid fibers can be exemplified. Furthermore, it is preferable to perform a Teflon (registered trademark) coating on the surface because the peelability of the collected nanofibers is improved. Moreover, the collection body 101 is supplied from the supply roll 111 in the state wound by roll shape.

  The transporting unit 104 pulls out the long collection body 101 from the supply roll 111 and slowly moves the vicinity of the nanofiber manufacturing apparatus 200 to transport nanofibers deposited on the collection body 101. Yes. The conveyance means 104 can wind up the nonwoven fabric on which the nanofibers are deposited together with the collection body 101.

  The suction means 102 is arranged on the side opposite to the side on which the nanofibers are collected of the collection body 101, that is, on the side opposite to the side on which the nanofiber production apparatus 200 is arranged, and passes through the collection body 101 from the nanofiber production apparatus 200. It is a device that sucks the gas that constitutes the flowing gas flow. In the present embodiment, the nonwoven fabric manufacturing apparatus 100 includes a blower such as a sirocco fan or an axial fan as the suction unit 102. The suction means 102 is disposed inside the duct 121 and sucks the gas flow mixed with the evaporated solvent, and can pass through the duct 121 and be conveyed to the solvent recovery device 106. Yes.

  The suction control means 105 is an apparatus that is electrically connected to the suction means 102 and controls the suction amount of the suction means 102. In this embodiment, a blower is employed as the suction means 102, and the suction control means 105 controls the amount of gas suction by controlling the rotational speed of the blower.

  The area regulating means 103 has a function of regulating the suction area of the suction means 102, and is disposed on the opposite side of the collection body 101 from the side where the nanofibers are collected, and is disposed between the collection body 101 and the suction means 102. The both ends are open cylinders. The shape of the region restricting means 103 preferably corresponds to the end shape from which the nanofibers of the nanofiber manufacturing apparatus 200 are emitted. For example, if the end shape is rectangular, the region restricting means 103 is also a rectangular tube. The body is preferred. Further, if the end shape is cylindrical, the region regulating means 103 is also preferably cylindrical.

  The nanofiber production apparatus 200 is an apparatus for producing a nanofiber 301 by injecting a charged raw material liquid 300 into a space and generating an electrostatic explosion in the space. The injection means 201, the charging means 202, A gas flow generating unit 203, a heating unit 205, a guide body 206, a charge eliminating unit 207, and a support 208 are provided.

  In addition, although the raw material liquid for manufacturing a nanofiber is described as the raw material liquid 300, and the manufactured nanofiber is described as the nanofiber 301, the boundary between the raw material liquid 300 and the nanofiber 301 is ambiguous in manufacturing. It is not something that can be clearly distinguished.

  FIG. 2 is a cross-sectional view showing the raw material liquid discharge portion.

  In addition, the raw material liquid discharge | release part 290 is members, such as the injection means 201, the charging means 202, the gas flow generation means 203 (refer below), the guide body 206 (refer below), the heating means 205 (refer below), the guide body 206, etc. A collective term for a group.

  The injection unit 201 is a device that injects the raw material liquid 300 into the space, and includes an injection container 211, a rotating shaft 212, and a motor 213.

  The injection container 211 is a container that can temporarily store the raw material liquid 300 and can inject the stored raw material liquid 300 into the space, has a cylindrical shape with one end closed, and has an injection port 216 on the peripheral wall. It has many. The other end portion of the injection container 211 includes a flange portion 214 that protrudes inward. The flange portion 214 functions as a bank for storing a predetermined amount of the raw material liquid 300 inside the injection container 211. In addition, the injection container 211 is formed of a conductor in order to give a charge to the stored raw material liquid 300. The injection container 211 is rotatably supported by a bearing 281 provided on the support 208. Specifically, the diameter of the ejection container 211 is preferably about 10 mm to 100 mm. It is because it will become difficult to concentrate the raw material liquid 300 and the nanofiber 301 by a gas flow if too large. On the other hand, if it is too small, the rotation for injecting the raw material liquid 300 by centrifugal force must be increased, and problems such as motor load and vibration occur. Furthermore, the diameter of 20 mm or more and 50 mm is preferable. The diameter of the injection port 216 is preferably about 0.01 mm to 2 mm.

  The rotation shaft body 212 is a shaft body for transmitting a driving force for rotating the injection container 211 and injecting the raw material liquid 300 by centrifugal force, and is inserted into the injection container 211 from the other end of the injection container 211. This is a rod-like body in which the closing portion and one end portion of the injection container 211 are joined. The other end is joined to the rotating shaft of the motor 213.

  The rotation speed of the motor 213 is selected from several rpm to 10,000 rpm depending on the diameter of the injection port 216 and the like.

  The charging unit 202 is a device that charges the raw material liquid 300 by charging it, and includes an induction electrode 221, an induction power source 222, and a grounding unit 223.

  The induction electrode 221 is a member that induces electric charges to the injection container 211 that is arranged in the vicinity and is grounded when the induction electrode 221 becomes a high voltage or a low voltage with respect to the ground, and surrounds the tip portion of the injection container 211. It is an annular member arranged like this.

  The induction power supply 222 is a power supply that can apply a high voltage to the induction electrode 221. The induction power supply 222 is generally a direct current power supply, but is not affected by the charging polarity of the fiber to be generated, that is, the case where the generated fiber is charged and collected on the electrode. In this case, a DC power source is preferable, but in other cases, a DC power source or an AC power source may be used.

  The grounding means 223 is a member that is electrically connected to the injection container 211 and can maintain the injection container 211 at a ground potential, and one end of the grounding means 223 is in an electrically connected state even when the injection container 211 is in a rotating state. It functions as a brush so that it can be maintained, and the other end is connected to the ground.

  The size of the induction electrode 221 needs to be larger than the diameter of the ejection container 211, and the diameter is preferably between 200 mm and 600 mm. The voltage of the induction power supply 222 is preferably set in the range of 10 KV to 200 KV.

  If an induction method is employed for the charging means 202 as in the present embodiment, it is possible to apply a charge to the raw material liquid 300 while maintaining the injection container 211 at the ground potential. If the injection container 211 is in a ground potential state, it is not necessary to electrically insulate members such as the rotary shaft 212 and the motor 213 connected to the injection container 211 from the injection container 211, and the structure of the injection unit 201 is simple. Can be adopted, which is preferable.

  In addition, as a charging unit, a power source may be directly connected to the injection container 211, and the injection container 211 may be maintained at a high voltage to apply a charge to the raw material liquid 300. In addition, the injection container 211 is formed of an insulator, and an electrode that is in direct contact with the raw material liquid 300 stored in the injection container 211 is disposed inside the injection container 211, and an electric charge is applied to the raw material liquid 300 using the electrode. It may be a thing.

  The gas flow generation means 203 is a device that generates a gas flow for changing the flight direction of the raw material liquid 300 injected from the injection container 211 to the direction in which the nanofibers 301 are deposited. In the case of the present embodiment, the gas flow generating means 203 employs a blower including an axial fan that forcibly blows the surrounding atmosphere (air). The gas flow generation means 203 is provided on the back of the motor 213 and generates a gas flow from the motor 213 toward the tip of the injection container 211. The gas flow generation means 203 can generate wind power that can be changed in the axial direction until the raw material liquid 300 injected in the radial direction from the injection container 211 by the centrifugal force reaches the induction electrode 221. ing. The gas flow generation means is not limited to this, and the gas flow generation means 203 can be removed and the gas flow 204 can be generated using only the suction means 102 in FIG.

  In FIG. 2, the gas flow is indicated by arrows. Further, the gas flow generating means 203 may be constituted by another blower such as a sirocco fan.

  The guide body 206 has a function of guiding the gas flow generated by the gas flow generation means 203 in a predetermined direction. The guide body 206 includes an annular introduction port 241 into which the gas flow generated by the gas flow generation means 203 is introduced, and converts the raw material liquid 300 in which the gas flow is injected radially from the injection container 211 into the axial direction. A lead-out port 242 through which the gas flow is led is provided. In addition, you may provide the windbreak wall which arrange | positions in the guide body 206 at the windward of the injection port 216, and prevents a gas flow from reaching the injection port 216 vicinity.

  The heating unit 205 is a heating source that heats the gas (safe gas) that constitutes the gas flow generated by the gas flow generation unit 203. In the case of the present embodiment, the heating means 205 is an annular heater disposed in the vicinity of the inlet 241 in the air passage 243 and can heat the gas passing through the heating means 205. .

  By heating the gas flow by the heating means 205, the raw material liquid 300 injected into the space is promoted to evaporate, and nanofibers can be manufactured efficiently.

  FIG. 3 is a perspective view showing the appearance of the ejection means.

  FIG. 4 is a front view schematically showing the ejection means.

  This figure shows a state in which the guide body 206, the charging means 202 and the like are omitted from the raw material liquid discharge section 290.

  The support 208 is a member for supporting the ejection unit 201 and is disposed between the ejection port 216 and the gas flow generation unit 203. The support 208 has a thickness (w in FIG. 4) perpendicular to the flow direction (arrow in the figure) of the gas flow generated by the gas flow generation means 203 than the diameter (d in FIG. 4) of the injection container 211. The shape is small and elongated along the gas flow. This is a shape for firmly supporting the ejection unit 201 without disturbing the gas flow as much as possible. The support 208 includes a streamlined streamline part 282 at the upstream end of the gas flow. Further, the support 208 is provided with a streamline part 282 at the downstream end. These streamline portions 282 further prevent the gas flow from being disturbed.

  In addition, the support 208 is provided with a raw material liquid supply path 217 for supplying the raw material liquid 300 to the injection container 211. Further, the support 208 is provided with an insertion hole 283 for inserting a conductive wire or the like for supplying electric power to the motor 213. Thus, by providing the raw material liquid supply path 217 and the insertion hole 283 inside the support 208, it is possible to avoid the gas flow from being disturbed by factors other than the support 208.

  Further, the support 208 is provided with a bearing 281 and a casing 284 at the lower end edge.

  The bearing 281 is for rotatably supporting the injection container 211 at the lower part of the side end of the support 208.

  The casing 284 has a cylindrical shape that can accommodate the motor 213 and the rotary shaft 212 therein, supports the motor 213, and supports the rotary shaft 212 via a bearing provided therein. The casing 284 includes a reduced diameter portion 285 that decreases in diameter toward the upstream side of the gas flow. By providing the casing 284, the gas flow is prevented from being disturbed as much as possible.

  Returning to FIG.

  The wind tunnel body 261 is a member that forms a wind tunnel that guides the raw material liquid 300 and the nanofibers 301 emitted from the raw material liquid discharge unit 290 so as to pass through a predetermined flight path. The wind tunnel body 261 is provided with an introduction opening at the base end part that can receive the raw material liquid 300 and the nanofiber 301 discharged from the raw material liquid discharge part 290 together with the gas flow generated by the gas flow generation unit 203, followed by The raw material liquid 300 is sufficiently electrostatically exploded to include an electrostatic explosion part that forms a space where the nanofiber 301 can be manufactured. The wind tunnel body 261 includes a static elimination unit that forms a space for neutralizing the nanofibers 301 that are manufactured by electrostatic explosion and are still charged, following the electrostatic explosion unit. The neutralization unit may be provided with a sufficient length for the nanofiber 301 to be neutralized naturally, or may be provided with a neutralization unit 207 that forcibly neutralizes the nanofiber 301.

  The neutralization means 207 is a device that forcibly neutralizes the charged nanofiber 301 and can discharge ions or particles having a polarity opposite to that of the charged nanofiber 301 into the space. It is. Specifically, the static elimination means 207 which employs any method such as a corona discharge method, a voltage application method, an AC method, a steady DC method, a pulse DC method, a self-discharge method, a soft X-ray method, an ultraviolet ray method, and a radiation method is adopted. Good.

  The wind tunnel body 261 is provided with a contraction part that gradually decreases in diameter (area) from the upstream side to the downstream side of the gas flow, following the static elimination part 263. The contraction part has a function of improving the density of the nanofibers in the space due to the tapered shape. Gas flow inlets 233 are provided on the upstream side and the downstream side of the contraction part, respectively. The gas flow inlet 233 is an opening that is connected to the high-pressure gas generator 232 and introduces a high-speed gas flow into the wind tunnel body 261. The gas flow introduction port 233 is provided in a direction in which the gas flow can be ejected from the side of the contraction portion having the large diameter toward the side of the small diameter.

  The high pressure gas generating means 232 is a device that generates a gas flow by introducing high pressure gas into the wind tunnel body 261. Specifically, the high-pressure gas generation means 232 includes a tank (cylinder) that can store high-pressure gas, a pump that forcibly introduces gas into the tank, and a valve that adjusts the pressure of the high-pressure gas in the tank. An apparatus including a derivation unit can be exemplified.

  The gas supplied from the high-pressure gas generating means 232 may be air, but a safety gas having an oxygen content ratio lower than that of air is desirable. This is to avoid explosion caused by the solvent evaporating from the raw material liquid 300. Examples of the safety gas include a low oxygen concentration gas obtained by removing oxygen from air to some extent by a resin membrane (hollow fiber membrane), and superheated steam. This description does not exclude the use of high-purity gas containing almost no oxygen, but carbon dioxide supplied from high-purity nitrogen or dry ice sealed in a cylinder in a liquid or gas state. Etc. are also available.

  Further, a heating means for heating the gas flow generated by the high-pressure gas generation means 232 may be provided.

  FIG. 5 is a diagram schematically illustrating a state in which the ejection unit is attached by the support.

  As shown in the figure, the injection means 201 is attached to a beam 108 suspended from the ceiling of the chamber 109 via a support 208.

  If the above-described support 208 is used to support the injection unit 201, the raw material liquid 300 and the nanofibers 301 injected from the injection unit 201 are not disturbed as much as possible to the gas flow generated by the gas flow generation unit 203. Can be reached. Therefore, the flight directions of the raw material liquid 300 and the nanofibers 301 are changed in an orderly manner and are not disturbed in the direction of the wind tunnel body 261, and can reach the collection body 101 while keeping the spatial density of the nanofibers 301 uniform. It becomes possible.

  Next, an outline of a manufacturing method of the nanofiber 301 will be described.

  First, a gas flow is generated inside the raw material liquid discharge part 290 and the guide body 206 by the gas flow generation means 203. On the other hand, the gas flow is sucked from the downstream side of the collecting body 101 by the suction means 102.

  Next, the raw material liquid 300 is supplied to the injection container 211. The raw material liquid 300 is separately stored in a tank (not shown), passes through the raw material liquid supply path 217, and is supplied from the other end of the injection container 211 into the injection container 211. Next, while supplying electric charge to the raw material liquid 300 stored in the injection container 211 by the induction power supply 222, the injection container 211 is rotated by the motor 213, and the charged raw material liquid 300 is injected from the injection port 216 by centrifugal force. .

  Here, as the raw material liquid 300 for manufacturing the nanofiber 301, what melt | dissolves and mixes an organic solvent in an epoxy resin, a polyimide resin, a LCP (liquid crystal polymer) resin, etc. can be illustrated.

  Further, examples of other solute materials 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 thereof include polylactic acid, polyglycolic acid, collagen, polyhydroxybutyric acid, polyvinyl acetate, and polypeptide. Moreover, the above-mentioned one type may be used, or a plurality of types may be mixed and used at a predetermined ratio.

Moreover, you may add an inorganic solid material to a raw material liquid. It is possible to change the properties of nanofibers obtained from inorganic solid materials. Examples of inorganic solid materials include metals, oxides, carbides, nitrides, borides, silicides, fluorides, sulfides, and the like. Furthermore, specific examples of the inorganic solid material 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 listed. Moreover, the above-mentioned one type may be used, or a plurality of types may be mixed and used at a predetermined ratio.

  As the solvent that can be used for the raw material liquid, a solvent in which the raw material liquid evaporates (volatilizes) while flying in the space is preferable. Specific examples include acetonitrile, toluene, dichloromethane, alcohols such as methanol and ethanol, and acetone. Furthermore, 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, propyl benzoate, Methyl acetate, ethyl acetate, propyl acetate, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, methyl chloride, ethyl chloride, methylene chloride, chloroform, o-chlorotoluene, 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, Examples include hexane, cyclohexane, cyclohexanone, cyclopentane, o-xylene, p-xylene, m-xylene, acetonitrile, tetrahydrofuran, N, N-dimethylformamide, pyridine, water and the like. Moreover, the above-mentioned one type may be used, or a plurality of types may be mixed and used at a predetermined ratio.

  The proportion of the solvent in the raw material liquid is preferably about 60% to 98%, and is determined by the fiber material to be used, the type of solvent, the diameter of the fiber to be produced, and the like.

  The direction of flight of the injected raw material liquid 300 is changed by the gas flow. Thereby, the injection ports 216 can be arranged vertically or substantially perpendicular to the deposition surface of the nanofiber 301, and a large amount of the raw material liquid 300 can be injected into a certain space. Further, since the gas flow is heated, the evaporation of the solvent is promoted, the electrostatic explosion is promoted, and the nanofiber 301 can be manufactured efficiently.

  Here, the gas flow that changes the flight direction of the raw material liquid 300 and promotes the evaporation of the solvent is preferably controlled so as not to reach the injection port 216 and the vicinity thereof. This is because the evaporation of the solvent contained in the raw material liquid 300 is unlikely to be accelerated in the vicinity of the injection port 216, so that the injection port 216 is not narrowed or blocked by the solute. Therefore, even if it continues injecting the raw material liquid 300 from the injection container 211 for a long period, it can suppress as much as possible that the injection amount falls. That is, it is possible to maintain the concentration of the raw material liquid 300 and the nanofiber 301 in the space for a long period of time.

  Then, the manufactured nanofiber 301 is transported by a gas flow inside the wind tunnel body 261 and reaches the collection body 101 in a high density state. Since the gas flow is sucked from the back (downstream side) by the suction means 102, the collector 101 functions as a filter and separates the nanofibers 301 and the gas flow and collects them while depositing only the nanofibers 301. . The collection body 101 on which the nanofibers 301 are deposited moves at a constant moving speed by the winding of the conveying means 104, and the nanofibers 301 deposited on the collection body 101 together with the collection body 101 while forming a nonwoven fabric. It moves and is wound around the transport means 104.

  As described above, the nonwoven fabric manufacturing apparatus 100 according to the present embodiment makes the concentration in the space of the raw material liquid 300 and the manufactured nanofibers 301 high and uniform, and the nanofibers 301 in the high concentration state are added. It becomes possible to collect. Therefore, it becomes possible to continue producing high quality nonwoven fabric stably.

  In the present embodiment, the support 208 supports the ejection unit 201 in a suspended state, but the present invention is not limited to this. For example, the support 208 is attached to a floor or the like, and may be supported in a state where the ejection unit 201 is placed.

(Embodiment 2)
Next, another embodiment will be described. Note that in this embodiment, description of portions common to the above embodiment is omitted.

  FIG. 6 is a perspective view showing an appearance of the raw material liquid discharge portion.

  FIG. 7 is a front view of the raw material liquid discharge part.

  As shown in the figure, the support 208 extends from the inner wall of the wind tunnel body 261 toward the rotation axis of the injection container 211 and extends along the gas flow generated by the gas flow generation means 203. It is. A plurality of supports 208 are provided in the wind tunnel body 261, and support the injection means 201 via bearings 281 and casings 284 (not shown) attached to the tips of the supports 208. Further, the total thickness (w in FIG. 7) in the direction perpendicular to the gas flow direction of the support 208 is smaller than the diameter of the injection container (d in FIG. 7). The support 208 supports the injection means 201 so as to be disposed on the central axis of the wind tunnel body 261, and has a function of rectifying the gas flow from the gas flow generation means 203. The support 208 is attached to the chamber or the like via an attachment body 262 attached to the outer wall of the wind tunnel body 261.

  By adopting the support 208 as described above, it is possible to support the injection container 211 while effectively suppressing vibration due to rotation without disturbing the gas flow generated by the gas flow generation means 203. Furthermore, since the gas flow can be rectified by the support 208, the raw material liquid 300 can be guided by the gas flow without disturbing the flight direction of the raw material liquid 300 injected from the injection container 211.

  The attachment body 262 is configured to be supported from the upper side, but is not limited thereto, and is configured to support the wind tunnel body 261 from the lower side, and the raw material liquid is supplied from the lower side than the injection container 211. You may make it supply.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a nanofiber manufacturing apparatus, an apparatus for spinning using the manufactured nanofiber, an apparatus for manufacturing a nonwoven fabric using the manufactured nanofiber, and the like.

It is sectional drawing which shows typically the nonwoven fabric manufacturing apparatus which is embodiment of this invention. It is sectional drawing which shows a raw material liquid discharge | release part. It is a perspective view which shows the external appearance of an injection means. It is a front view which shows an injection means roughly. It is a figure which shows roughly the state by which the injection means was attached by the support body. It is a perspective view which shows the external appearance of a raw material liquid discharge | release part. It is a front view of a raw material liquid discharge | release part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Nonwoven fabric manufacturing apparatus 101 Collecting body 102 Suction means 103 Area | region control means 104 Conveyance means 105 Suction control means 106 Solvent recovery apparatus 108 Beam 109 Chamber 111 Roll 121 Duct 200 Nanofiber manufacturing apparatus 201 Injection means 202 Charging means 203 Gas flow generation means 205 Heating means 206 Guide body 207 Static elimination means 208 Support body 211 Injection container 212 Rotating shaft body 213 Motor 214 Flange portion 216 Injection port 217 Raw material liquid supply path 221 Induction electrode 222 Induction power source 223 Grounding means 232 High-pressure gas generation unit 233 Gas flow introduction port 241 Inlet 242 Outlet 243 Air passage 261 Wind tunnel body 262 Attachment body 263 Static elimination part 281 Bearing 282 Streamline part 283 Insertion hole 284 Casing 285 Reduced diameter part 290 Raw material liquid discharge part 00 raw material liquid 301 nano-fiber

Claims (6)

Injecting means for injecting a raw material liquid as a raw material of the nanofiber into the space, a charging means for applying a charge to the raw material liquid for charging, and a gas flow for guiding the injected raw material liquid or the manufactured nanofiber A nanofiber manufacturing apparatus comprising a gas flow generating means for generating
The injection means includes a cylindrical injection container that has an injection port on a peripheral wall and injects a raw material liquid by centrifugal force,
Furthermore, nanofiber manufacturing equipment
A nanofiber manufacturing apparatus provided with a support body that supports the jetting unit, which is disposed upstream of the jetting gas and upstream of the jetting gas and has a thickness perpendicular to the gas flowing direction that is smaller than the diameter of the jetting container. .   The said support body is a nanofiber manufacturing apparatus of Claim 1 provided with a streamline type streamline part in the upstream of a gas flow. The ejection means is supported by a plurality of supports.
The nanofiber manufacturing apparatus according to claim 1, wherein the total thickness of the support in the direction perpendicular to the gas flow direction is smaller than the diameter of the injection container.   The nanofiber manufacturing apparatus according to claim 3, wherein the support is a fin that controls the flow of the gas flow.   The nanofiber manufacturing apparatus according to claim 1, wherein the support includes a raw material liquid supply path for supplying a raw material liquid to the injection container inward. An injection means comprising a cylindrical injection container for injecting a raw material liquid by centrifugal force having an injection port in the peripheral wall for injecting a raw material liquid as a raw material of nanofibers into the space;
Charging means for charging by charging the raw material liquid;
A gas flow generating means for generating a gas flow for guiding the injected raw material liquid or the manufactured nanofiber;
A support body, which is disposed between the injection port and the gas flow generation means, and which supports the injection means, wherein the thickness in the direction perpendicular to the flow direction of the gas flow is smaller than the diameter of the injection container;
A collecting means for collecting nanofibers produced in the space;
A non-woven fabric manufacturing apparatus comprising: transport means for transporting collected nanofibers.

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