JP4743194B2 - Nanofiber spinning method and apparatus - Google Patents

Description

  The present invention relates to a nanofiber combination method and apparatus for producing nanofibers made of a polymer material and using them as yarns.

  Conventionally, an electrospinning method (also referred to as an electrospinning method or a charge-induced spinning method) is known as a method for producing a nanofiber having a submicron-scale diameter made of a polymer material. In the conventional electrospinning method, by supplying a polymer solution to a needle-shaped nozzle to which a high voltage is applied, the polymer solution that flows out linearly from the needle-shaped nozzle is charged, and the polymer solution As the solvent evaporates, the distance between the charged charges decreases and the acting Coulomb force increases, and when the Coulomb force exceeds the surface tension of the linear polymer solution, the linear polymer solution explodes. A phenomenon of stretching occurs, and this phenomenon called electrostatic explosion is repeated as primary, secondary, and sometimes tertiary, so that nanofibers made of a polymer having a submicron diameter are manufactured.

  In the conventional electrospinning method, since only one nanofiber is manufactured from the tip of one nozzle, there is a problem that productivity does not increase. Therefore, as a method for producing a large amount of nanofibers, a method using a plurality of nozzles has been proposed (see, for example, Patent Document 1). In Patent Document 1, a polymer solution stored in a barrel is supplied to a number of needle-shaped nozzles charged by a pump and discharged to create a large amount of nanofibers, which are charged with a polarity different from that of the nozzles. The technology for producing highly porous polymer webs with extremely high porosity, in which nanofibers are laminated in a three-dimensional network structure, is disclosed by collecting and transporting with a collected collector. From the target level to the practical level.

Conventionally, nanofibers produced by electrospinning have been manufactured as webs and have been used in various ways such as artificial leather, filters, diapers, sanitary napkins, adhesive spinning agents, wiping cloths, artificial blood vessels, and bone fixation devices. It is difficult to obtain the above mechanical properties and there is a limit to the use in a wide range of applications, and when trying to improve the mechanical properties by making the nanofiber web manufactured in this way into a continuous thread, the web will be constant. Nanofiber manufactured by the electrospinning method after having pointed out that there is a problem in that a short fiber is manufactured by cutting into length, and a separate spinning process is required to manufacture spun yarn from this short fiber. There has been proposed a technique for continuously producing a yarn using the web (see, for example, Patent Document 2). In this Patent Document 2, nanofibers are spun on a static surface of water or an organic solvent in a collector charged in a polarity opposite to that of the nozzle from the nozzles charged in a row and deposited in a web. The web to be deposited is pulled up by a rotating roller rotating at a constant linear velocity from a point 1 cm or more away from one end side viewed in the row direction of the nozzles to form a continuous yarn, which is pressed, stretched, dried and wound. A continuous yarn is obtained by taking off. In addition, continuous yarn can be twisted.
JP 2002-201559 A JP-T-2006-507428

  However, the technique described in Patent Document 2 is generated from each nozzle due to the spread of the deposition area while generating nanofibers directly from each nozzle and statically depositing them at a position corresponding to the nozzle on the collector. Nanofibers are entangled with each other to form a narrow web, and the nanofibers are pulled out from one end of the web, and the continuous nanofibers are pulled out to the other end of the web and focused on a continuous yarn. Therefore, while the deposition of nanofibers spun from each nozzle is static and almost equivalent, the deposition is close to the pulling side because the pulling action tends to concentrate in the deposition area close to the pulling side. There may be a difference in the extraction amount of the nanofiber between the deposition area and the distant deposition area. There is a problem that a non stable difficult to properly control the thickness and mechanical properties of continuous yarn by being drawn in a state that caused the difference in. Further, there is a problem that it is necessary to suppress the drawing speed to make the drawing action evenly extend to the deposition area far from the drawing side, and it is difficult to manufacture in large quantities.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a nanofiber knitting method capable of producing a high-strength and homogeneous yarn comprising nanofibers produced by an electrospinning method with high productivity and low cost. And to provide a device.

Doubling method nanofiber of the present invention, the polymeric material was stretched at the dissolved polymer solution of one or more electrostatic drained by charging the small hole explosion solvent to produce nanofibers, generating Flow in one direction by rotating the nanofiber to flow around the axial center along the flow direction of the nanofiber , and the nanofiber generation process to flow the nanofiber to be flown in one direction and the small hole through which the polymer solution flows out during the nanofiber generation process The nanofiber to be swirled around an axis along the flow direction , the swirling and flowing nanofiber is focused, the nanofiber is twisted, and the twisted nanofiber is recovered. .

  According to the above configuration, nanofibers made of a polymer material are generated by the electrospinning method, and the nanofibers are converged while being swirled and effectively twisted during the generation process, so that they are homogeneous and have high strength. By collecting the yarn, a high-strength and homogeneous yarn composed of nanofibers can be produced with high productivity and low cost.

In addition , a polymer solution in which a polymer substance is dissolved in a solvent is supplied into a conductive rotating container having one or a plurality of small holes, the electric charge is charged to the rotating container, and the rotating container is rotated to flow out of the small holes. rotating a linear polymer solution and nanofiber generating step of generating nanofibers by stretching at an electrostatic explosion causes stretched by the centrifugal force, the nanofibers in the production step from the axial direction one side portion of the rotary vessel the has a deflecting flow step of flowing while turning toward the axial direction other side of the container, comprising the steps twist twisting by focusing the nanofibers swirling flow, and a recovery step of recovering the nanofibers twisted Is preferred.

  According to this configuration, when the polymer solution charged with charge in the rotating container flows out linearly from the plurality of small holes, the polymer solution is first stretched by the action of centrifugal force. Since it is not necessary to concentrate the long and narrow nozzle, it is not affected by electric field interference, so even if the small holes are arranged at high density, it is stretched reliably and effectively, and then exploded by multiple electrostatic explosions The nanofibers made of a polymer material can be efficiently produced by stretching the polymer, and the nanofibers during the production process are moved from one side in the axial direction of the rotating vessel to the other side in the axial direction of the rotating vessel. Since the fluid flows while swirling toward the direction, the nanofibers that swirl and flow are converged to effectively twist and combine the fibers. Thereby, while being able to produce | generate nanofiber efficiently and to twist using the production | generation process, a homogeneous and high intensity | strength yarn can be manufactured more efficiently with low cost.

  In addition, the deflection flow step is a step of blowing air from one axial side of the rotating container, or a voltage having the same polarity as the polarity of the nanofiber charging on the reflective electrode disposed on one axial side of the rotating container. It is preferable to consist of a flow process in which the nanofibers in the production process are flowed toward the other side in the axial direction of the rotating container by applying the above. In particular, when the air blowing process is performed, the air flows in the direction of flow of the nanofiber, so that the evaporated solvent is quickly discharged, the solvent concentration in the surrounding atmosphere is not increased, and the solvent is smoothly evaporated. The electroexplosive action is reliably obtained, the desired nanofibers are reliably generated, and the flow direction of the nanofibers during the generation process can be more effectively regulated, which is preferable. In addition, the air flow is effective even at room temperature, but by heating the air from room temperature and sending warm air, the evaporation of the solvent in the nanofiber is accelerated and further effects can be obtained. Also, the nanofiber can be effectively deflected and flowed by the reflective electrode.

  In addition, in the above-described spinning method, if the twisting process includes a focusing process in which the generated nanofibers are wound in a spiral flow and focused while swirling, the nanofibers can be twisted more effectively, A strong yarn can be produced, which is preferable.

  Further, in the above-described yarn combining method, the twisting process is performed by applying or grounding a voltage having a polarity opposite to the polarity of the nanofiber charging to the annular electrode disposed between the nanofiber generating process and the collecting process, The nanofiber can be focused while flowing toward the annular electrode, and the nanofiber can be sent through the annular electrode to the recovery process. By focusing using the annular electrode in this way, it can be more effectively focused and strongly twisted, and a high-strength yarn can be manufactured, which is preferable.

Furthermore, the doubling initial, twisted core yarn supply through a swivel axis of the nanofibers converging pivots process and so as to recover the core yarn in the recovery process, the nanofibers are involved in core yarn Thus, it is possible to surely combine the yarns even in the initial stage of the unstable yarn operation.

  Further, the nanofiber spinning device of the present invention is rotatably supported and has a conductive rotary container having one or a plurality of small holes at a radial distance from the rotation axis, and the rotary container is driven to rotate. Rotation driving means, polymer solution supplying means for supplying a polymer solution in which a polymer substance is dissolved in a solvent in the rotating container, and high voltage generating means for charging the polymer solution flowing out from a small hole of the rotating container. And deflecting and flowing the nanofiber produced by stretching the polymer solution flowing out of the small hole of the rotating container by centrifugal force and electrostatic explosion from one side of the rotating container toward the other side in the axial direction It comprises a flow means and a collection means for collecting and collecting the nanofibers that flow while swirling.

  According to this configuration, it is possible to produce a high-strength and homogeneous yarn composed of nanofibers with good productivity and low cost by performing the nanofiber combination method, and particularly by using a rotating container. In addition to being able to produce nanofibers more efficiently like this, it is possible to produce a uniform and high-strength yarn at a lower cost with higher productivity because it can be twisted using the production process. .

  In addition, the deflecting flow means blows air from one side in the axial direction of the rotating container toward the other side, and the reflecting electrode disposed on one side in the axial direction of the rotating container is charged with nanofibers. When configured with either one or both of the voltage applying means for applying a voltage of the same polarity as the polarity, the solvent is smoothly evaporated by blowing air from the blowing means, and the electrostatic explosion action is reliably obtained and desired. The nanofibers can be reliably produced, and the flow direction of the nanofibers during the production process can be more effectively deflected and reliably swirled. In addition, the air flow is effective even at room temperature, but by heating the air from room temperature and sending warm air, the evaporation of the solvent in the nanofiber is accelerated and further effects can be obtained. Also, the nanofiber can be effectively deflected and flowed by the reflective electrode.

  In another nanofiber spinning device of the present invention, a polymer solution in which a polymer substance is dissolved in a solvent is applied with a high voltage to flow out from one or a plurality of small holes and stretched by electrostatic explosion. The nanofiber generating means for causing the generated nanofibers to flow in one direction, and the rotating means for rotating the nanofibers generated by rotating the nanofiber generating means about the axis along the flow direction of the nanofibers. And a recovery means that collects the nanofibers and collects the nanofibers in a twisted state. In this way, the nanofiber generation means for generating the nanofibers by flowing the polymer solution out of the small holes is rotated. Even if the nanofibers are swirled, the above-described nanofiber combination method is used to produce a high-strength, homogeneous yarn composed of nanofibers with low productivity and low cost. It can be produced at.

  According to the nanofiber combination method and apparatus of the present invention, a nanofiber made of a polymer material is generated by an electrospinning method, and the nanofiber is rotated and focused during the generation process to effectively twist the nanofiber. Can be applied to form a uniform and high-strength yarn, and the yarn is collected, so that a high-strength and homogeneous yarn composed of nanofibers can be produced with high productivity and at low cost.

  Hereinafter, embodiments of the nanofiber combination method and apparatus of the present invention will be described with reference to FIGS.

(First embodiment)
First, a first embodiment of the nanofiber spinning device of the present invention will be described with reference to FIGS.

  1 and 2, reference numeral 1 denotes a nanofiber spinning device, which includes a nanofiber generating means 2, a deflection flow means 10, a collecting means 13, and a core yarn supplying means 23. The nanofiber generating means 2 is rotatably supported around a vertical axis, and a large number of small holes 4 having a diameter of about 0.01 to 2 mm are formed on the peripheral surface at intervals of several mm, or one or a small number depending on the case. A cylindrical container 3 as a rotating container, a rotation driving means 5 for rotationally driving the cylindrical container 3, and a polymer solution supplying means 6 for supplying a polymer solution 7 in which a polymer substance is dissolved in a solvent into the cylindrical container 3. A first high voltage generating means 8 for applying a high voltage of 1 kV to 100 kV, preferably 10 kV to 100 kV to the cylindrical container 3 to charge the polymer solution 7, and from the small hole 4 of the cylindrical container 3. The polymer solution 7 that has flowed out is stretched by centrifugal force and electrostatic explosion to generate nanofibers 9.

  The deflection flow means 10 includes a reflective electrode 11 disposed on the upper portion of the cylindrical container 3, and a second high voltage generating means 12 that applies a high voltage of the same polarity as the cylindrical container 3 to the reflective electrode 11, and The nanofiber 9 generated by the nanofiber generating means 2 at the electrode 11 is configured to flow while swiveling downward toward the cylindrical container 3. The collecting means 13 includes a rotating member 14 that focuses and winds the nanofibers 9 that flow downward while being swung by the deflecting flow means 10, and a high voltage that has a polarity opposite to that of the cylindrical container 3. And a third high voltage generating means 15 for applying. The same effect can be obtained by connecting (grounding) the rotating member 14 to the ground instead of applying a high voltage to the rotating member 14 by the third high voltage generating means 15. The core yarn supply means 23 is disposed at the axial center position of the lower portion of the cylindrical container 3 and supplies the core yarn 24 downward, so that the core yarn 24 is wound around the rotating member 14 of the collection means 13. It is configured. The supply of the core yarn 24 by the core yarn supply means 23 may be at least a certain period until the winding / recovery of the nanofiber 9 at the initial stage of the combined yarn is stabilized.

  Next, the detailed configuration and operation of each means will be described. First, the nanofiber production | generation means 2 is demonstrated with reference to FIG. The end of the rotating cylinder 16 is penetrated and fixed integrally with the axial center part of the upper end of the cylindrical container 3, and the cylindrical container 3 is supported by the rotating cylinder 16 so as to be rotatable around the axis as indicated by an arrow R. ing. The rotary cylinder 16 is made of a material having high electrical insulation. At the lower end of the cylindrical container 3, an opening having a closed or rising peripheral wall is formed in the axial center portion. The rotary cylinder 16 is rotatably supported by a support frame 17 made of a material having high electrical insulation via a bearing 18 and is rotationally driven by the rotational drive means 5 at a rotational speed of 30 to 10000 rpm. . The rotation driving means 5 includes a motor 19 installed on the support frame 17, a pulley 20 provided on the output shaft of the motor 19, a pulley 21 provided on the outer periphery of the rotating cylinder 16, and the pulleys 20, 21. The belt 22 is wound around. A sensorless DC motor is preferably used as the motor 19 because the sensor may malfunction due to the influence of high-voltage noise.

  In the cylindrical container 3, the polymer solution 7 is supplied through the polymer solution supply means 6 that passes through the rotating cylinder 16 and is inserted into the cylindrical container 3. Examples of the polymer material constituting the polymer solution 7 include polypropylene, polyethylene, polystyrene, polyethylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly-m-phenylene terephthalate, poly-p-phenylene isophthalate, and polyvinylidene fluoride. , Polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinyl chloride, polyvinylidene chloride-acrylate copolymer, polyacrylonitrile, polyacrylonitrile-methacrylate copolymer, polycarbonate, polyarylate, polyester carbonate, nylon, aramid, polycaprolactone Polylactic acid, polyglycolic acid, collagen, polyhydroxybutyric acid, polyvinyl acetate, polypeptide, etc. are suitable. It can be exemplified as, at least one selected from these are used, but the invention is not particularly limited thereto.

  Examples of the solvent that can be used include 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, 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, pyridine, water, etc., and at least one selected from these Although used, it is not particularly limited to these.

  With this configuration of the nanofiber generating means 2, when the cylindrical container 3 is rotated at a high speed by the rotation driving means 5, centrifugal force acts on the polymer solution 7 charged with electric charge, and the linear holes form the small holes 4. The polymer linear body is stretched by the action of centrifugal force to produce a thin polymer linear body, and the solvent evaporates, whereby the diameter of the polymer linear body is reduced. Along with this, the charged charges are concentrated, and when the Coulomb force exceeds the surface tension of the polymer solution 7, a primary electrostatic explosion occurs and the film is stretched explosively. As a result of secondary electrostatic explosion, the nanofiber 9 made of a polymer substance having a sub-micron diameter is efficiently obtained by extending the explosion explosively and, in some cases, generating a third electrostatic explosion or the like. To be manufactured.

  The reflecting electrode 11 of the deflecting flow means 10 is disposed on the support frame 17 so as to face the cylindrical container 3 with an appropriate interval, and is flowed out and extended from the cylindrical container 3 by the deflecting flow means 10. The generated polymer linear body and the nanofibers 9 generated by electrostatic explosion thereafter are directed downward of the cylindrical container 3 as indicated by an arrow F, and the cylindrical container 3 is further rotated at a high speed. It will flow downward while turning around the axis of. In addition, in addition to the reflective electrode 11 or in place of the reflective electrode 11, air blowing means (not shown) is provided so that air is blown from the reflective electrode 11 side toward the flow direction of the nanofiber 9. Also good. Then, the air flows in the flow direction of the nanofibers 9 so that the evaporated solvent is quickly discharged, the solvent concentration in the surrounding atmosphere is not increased, and the solvent is smoothly evaporated, and the electrostatic explosion action is performed. It is possible to reliably obtain the desired nanofibers 9 and to more effectively regulate the flow direction of the nanofibers 9 during the production process, and to further enhance the swirl flow. In addition, the air flow is effective even at room temperature, but by heating the air from room temperature and sending warm air, the evaporation of the solvent in the nanofiber is accelerated and further effects can be obtained.

The rotating member 14 of the recovery means 13 is configured to be rotatable in the winding direction around the horizontal axis as indicated by an arrow w. As shown in FIG. since the cylindrical container 3 at 15 to apply a high voltage of opposite polarity, the axis portion is configured in the take-up shaft 25 made of a conductive cylindrical axis or cylinder axis, nanofibers wound on both sides A holding rod 26 made of synthetic resin for holding 9 is provided. By applying a high voltage having a polarity opposite to that of the cylindrical container 3 to the winding shaft 25, the plurality of nanofibers 9 that have flowed downward while turning are converged as shown in FIG. As a result, the plurality of nanofibers 9 are twisted and combined, and are wound around the rotating member 14 and collected as shown in FIG.

  Also, the action of converging and twisting a plurality of nanofibers 9 swirling and flowing in the collecting means 13 is unstable at least from the start of the yarn to the beginning of the yarn. There is. Therefore, as shown in FIG. 1, before starting the merging, the core yarn 24 is pulled out from the core yarn supplying means 23 and its tip is wound around the rotating member 14 of the collecting means 13, and then nanofiber generation is performed. When the means 2 and the deflection flow means 10 are operated and a high voltage of reverse polarity is applied to the recovery means 13, a plurality of nanofibers 9 are generated and flow downward while rotating and approach the recovery means 13. Start to converge. Here, by winding and rotating the rotating member 14 of the collecting means 13, the nanofibers 9 that flow while converging are entangled with the core yarn 24 and converged at once, and are reliably combined around the core yarn 24. Collected. The same effect can be obtained by connecting (grounding) the rotating member 14 to the ground instead of applying a high voltage to the rotating member 14 by the third high voltage generating means 15. Conversely, when a high voltage is applied to the recovery means 13 by the third high voltage generation means 15, the cylindrical container 3 and the second high voltage generation means 12 are not provided without providing the first high voltage generation means 8 and the second high voltage generation means 12. The reflective electrode 1 may be grounded.

Further, when the winding of the yarn by the rotating member 14 in the collecting means 13 is stabilized, the nanofibers 9 following the nanofibers 9 that have been converged and combined before the core yarn 24 are entangled without supplying the core yarn 24. As shown in FIG. 4, the core yarn 24 is not supplied from the core yarn supplying means 23, and the core yarn 24 is functioned by the nanofibers 9 being combined. Can be threaded. It should be noted that when it is desired to manufacture a yarn having the core yarn 24 at the center, the core yarn 24 may be continuously supplied as a matter of course. In this case, in the example of FIG. 1, the core yarn supplying means 23 that accommodates a necessary amount of the core yarn 24 is disposed in the lower portion of the cylindrical container 3, but the core yarn supplying means 23 that can supply a large amount of core yarn 24 is provided. disposed above the cylindrical vessel 3, it is preferable to be supplied toward the recovery means 13 is passed through the axial center portion of the rotating cylinder 16 and the cylindrical container 3.

(Second Embodiment)
Next, a second embodiment of the nanofiber spinning device of the present invention will be described with reference to FIGS. In the following description of the embodiments, components that are the same as those in the preceding embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are mainly described.

  In the nanofiber spinning device 1 of the above embodiment, a plurality of nanofiber generating means 2 provided with the rotationally driven cylindrical container 3 and deflection flow means 10 provided with the reflective electrode 11 or the air blowing means or both are combined. The example in which the nanofibers 9 are made to flow while swirling is shown. However, in the nanofiber spinning device 31 of the present embodiment, as shown in FIG. 5, a polymer solution in which a polymer substance is dissolved in a solvent. And a nanofiber generating means 32 for causing a plurality of nanofibers 9 produced by flowing out from a plurality of small holes by applying a high voltage and stretching by electrostatic explosion to flow substantially straight in one direction. There is provided swirl flow generating means 33 for converging the nanofiber 9 while being swirled in a swirl flow. The collecting means 13 that winds the nanofibers 9 that are focused and twisted while being swung around the rotating member 14 is the same as in the first embodiment.

  As a specific example of the nanofiber generating means 32, as shown in FIG. 6 (a), a plurality of nozzle members 34 for applying a high voltage to flow out the polymer solution are arranged in one or a plurality of rows, While applying a high voltage from the high-voltage generating means 36 to the cylindrical container 35 that is rotationally driven as in the first embodiment, as shown in FIG. The polymer solution 7 is supplied to generate nanofibers 9 by centrifugal force and electrostatic explosion, and flows in one direction by a parabolic reflecting electrode (not shown) disposed on the outer periphery of the cylindrical container 35. You may make it let you.

  Specific examples of the swirling flow generating means 33 include a tapered cylindrical body 37 whose diameter decreases toward the collecting means 13 side, and a direction inclined to the upper portion of the tapered cylindrical body 37 in a direction substantially tangential from the periphery and in a small diameter direction. One or a plurality of gas feeding means 38 for blowing out air or other gas from the inside are arranged. The tapered cylindrical body 37 is composed of a conductive member, and an alternating voltage or a relatively low voltage having the same polarity as the charging polarity of the nanofiber 9 is applied to the tapered cylindrical body 37 by the voltage applying means 39. Further, the nanofiber 9 is prevented from being deposited and deposited by charging of the tapered cylindrical body 37, and further, the convergence of the nanofiber 9 is promoted. The tapered cylindrical body 37 does not need to be an exact prefix cone, but rather has a slightly curved shape and is more suitable for convergence.

  In the present embodiment, the nanofibers 9 generated by the nanofiber generating means 32 can be focused while being effectively twisted by the swirling flow generated in the tapered cylindrical body 37 of the swirling flow generating means 33. It can be collected by winding it around the rotating member 14 of the collecting means 13, and a high-strength and homogeneous yarn composed of nanofibers 9 can be produced with high productivity and at low cost. it can.

  As a modified configuration example of this embodiment, instead of providing the swirling flow generating means 33 or in combination with the swirling flow generating means 33, the nanofiber generating means 32 is arranged around the axis along the flow direction of the nanofiber 9. A rotating means (not shown) for rotating may be provided, and a turning motion may be given to the nanofiber 9 generated by the nanofiber generating means 32 and flowing in one direction.

(Third embodiment)
Next, a third embodiment of the nanofiber spinning device of the present invention will be described with reference to FIG.

  In this embodiment, as shown in FIG. 7, the swirl flow generating means 33 of the second embodiment is further added to the first embodiment. According to this embodiment, the nanofiber 9 generated and swirled by the combination of the nanofiber generating means 2 and the deflecting flow means 10 is further swirled in the swirl flow by the swirl flow generating means 33 while swirling. Since the fibers can be focused, the nanofibers 9 can be twisted more effectively, and a high-strength yarn can be manufactured.

(Fourth embodiment)
Next, a fourth embodiment of the nanofiber spinning device of the present invention will be described with reference to FIG.

  In the present embodiment, as shown in FIG. 8, as the core yarn supply means 23, the rotation axis of the cylindrical container 3 is guided by a guide roller 42 in which the core thread 24 drawn from the core thread supply reel 41 is arranged above the cylindrical container 3. It is configured to be guided so as to pass through the center, pass through the rotational axis position of the cylindrical container 3 and be wound around the rotating member 14 of the collecting means 13, and at a position spaced from the cylindrical container 3 at an appropriate distance, An annular electrode 43 is arranged so that the core yarn 24 penetrates the center position. Instead of applying a high voltage to the rotating member 14 of the collecting means 13 by the third high voltage generating means 15, the polarity of the charged charge of the nanofiber 9 from the third high voltage generating means 15 is reversed to the annular electrode 43. A high voltage with polarity is applied, and an electric field is generated between the rotating container 3 and the annular electrode 43. The polymer solution flowing out of the small hole 4 is charged by the action of the electric field, and nanofibers 9 are generated by electrostatic explosion. The nanofibers 9 are deflected and flowed toward the annular electrode 43 and are converged and entangled with the core yarn 24. The nanofibers 9 twisted and twisted around the core yarn 24 are collected by the collecting means 13.

  In the present embodiment, since the nanofiber 9 is generated and deflected and flowed by the electric field between the cylindrical container 3 and the annular electrode 43, it is necessary to dispose the reflective electrode 11 and the blowing means as shown in FIG. Absent. Of course, they may be additionally provided. Further, since it is sufficient to generate an electric field between the cylindrical container 3 and the annular electrode 43, if the third high voltage generating means 15 is provided, the first high voltage generating means 8 is eliminated and the cylindrical container 3 is removed. Conversely, if a high voltage is applied to the cylindrical container 3 by the first high voltage generating means 8, the annular electrode 43 may be grounded. Of course, as shown in FIG. 8, when high voltages of opposite polarities are applied to the cylindrical container 3 and the annular electrode 43, the charge charging action on the polymer solution and the deflection flow action and focusing action of the charged nanofibers become stronger. Obtainable.

  According to the nanofiber combination method and apparatus of the present invention, a nanofiber made of a polymer material is generated by an electrospinning method, and the nanofiber is rotated and focused during the generation process to effectively twist the nanofiber. Can be used to form a uniform and high-strength yarn, and the yarn can be recovered, so that a homogeneous yarn made of nanofibers can be produced with high productivity and at a low cost. It can be suitably used for the production of yarns.

The perspective view which shows the whole schematic structure of the nanofiber spinning device in the 1st Embodiment of this invention. The perspective view which shows the structure of the nanofiber production | generation means and deflection | deviation flow means in the embodiment. The collection | recovery means in the embodiment is shown, (a) is a perspective view which shows a structure, (b) is a perspective view which shows the winding-up state of a yarn. The whole perspective view of the combined yarn state which does not use the core yarn of the embodiment. The perspective view which shows the whole schematic structure of the nanofiber spinning device in the 2nd Embodiment of this invention. (A), (b) is the front view and perspective view which show the structural example of the nanofiber production | generation means of the embodiment. The perspective view which shows the whole schematic structure of the nanofiber spinning device in the 3rd Embodiment of this invention. The perspective view which shows the whole schematic structure of the nanofiber spinning device in the 4th Embodiment of this invention.

Explanation of symbols

1 Nanofiber spinning device 2 Nanofiber generation means 3 Cylindrical container (rotary container)
4 Small hole 5 Rotation driving means 6 Polymer solution supply means 7 Polymer solution 8 First high voltage generating means 9 Nanofiber 10 Deflection flow means 11 Reflecting electrode 12 Second high voltage generating means 13 Recovery means 14 Rotating member 23 core Thread supply means 24 Core yarn 31 Nanofiber spinning device 32 Nanofiber generation means 33 Swirling flow generation means 37 Tapered cylindrical body 38 Gas supply means 39 Voltage application means 43 Annular electrode

Claims (9)

A nano solution in which a polymer solution in which a polymer substance is dissolved in a solvent is charged from one or more small holes, flows out, and stretched by electrostatic explosion to generate nanofibers, and the generated nanofibers flow in one direction. Fiber generation process;
By rotating a small hole through which the polymer solution flows out during the nanofiber generation process around the axis along the flow direction of the nanofiber, the nanofiber flowing in one direction is swung around the axis along the flow direction , A twisting process of twisting nanofibers by converging swirling and flowing nanofibers ;
And a recovery step for recovering the twisted nanofibers. A polymer solution in which a polymer substance is dissolved in a solvent is supplied into a conductive rotating container having one or a plurality of small holes, the electric charge is charged in the rotating container, and the rotating container is rotated, and the linear flow out of the small holes the polymer solution causes stretching by centrifugal force and nanofiber generating step of generating nanofibers by stretching at an electrostatic explosion during generation step of rotating the container from the axial direction one side portion of the rotary vessel nanofibers A deflection flow step of flowing while swirling toward the other side in the axial direction, a twisting step of converging and twisting the swirling nanofibers ,
Features and to Luna Roh doubling method the fiber to have a recovery step of recovering the nanofibers twisted.   The deflection flow process is a process of blowing air from one side in the axial direction of the rotating container, or a voltage having the same polarity as the charging polarity of the nanofibers is applied to the reflective electrode disposed on one side in the axial direction of the rotating container. The nanofiber spinning method according to claim 2, further comprising a flow step of flowing the nanofiber in the generation step toward the other side in the axial direction of the rotating container. The nanofiber spinning method according to any one of claims 1 to 3 , wherein the twisting step includes a converging step of converging the generated nanofibers while being swirled in a spiral flow and swirling. In the twisting process, a voltage opposite to the polarity of nanofiber charging is applied or grounded to the annular electrode placed between the nanofiber production process and the recovery process, and the nanofiber in the production process flows toward the annular electrode. 5. The nanofiber spinning method according to any one of claims 1 to 4 , further comprising a converging step of converging while feeding and sending out to the recovery step through the annular electrode. The spinning initial, the core yarn was fed through swivel axis of the nanofibers converging pivots stranding, claim 1-5, characterized in that recovering the core yarn in the recovery step 1 A method for synthesizing nanofibers described in 1.   A conductive rotating container that is rotatably supported and has one or a plurality of small holes at a radial distance from the rotation axis, rotation driving means for rotating the rotating container, and a polymer substance in the rotating container A polymer solution supply means for supplying a polymer solution dissolved in a solvent, a high voltage generating means for charging the polymer solution flowing out from the small hole in the rotating container, and a polymer solution flowing out from the small hole in the rotating container. A deflecting flow means for deflecting and flowing nanofibers generated by centrifugal force and electrostatic explosion from one side in the axial direction of the rotating container to the other side, and focusing the nanofibers flowing while swirling And a collecting means for collecting the nanofiber. The deflection flow means includes a blowing means for blowing air from one side in the axial direction of the rotating container toward the other side, and a polarity of charging of the nanofibers on the reflective electrode disposed on one side in the axial direction of the rotating container. 8. The nanofiber spinning device according to claim 7, comprising either or both of voltage applying means for applying a voltage of the same polarity.   A nanofiber generating means for flowing a polymer solution in which a polymer material is dissolved in a solvent by applying a high voltage to flow out of one or a plurality of small holes and stretching the nanofiber generated by electrostatic explosion in one direction Rotating means that rotates the nanofiber generated by rotating the nanofiber generating means around the axis along the flow direction of the nanofiber, and collecting the swirling nanofiber in a twisted state by focusing the rotating nanofiber And a nanofiber synthesizing device.

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