JP2013133554A - Method and apparatus for depositing fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly deposit, on superposed sheets, fiber obtained through the electrostatic drawing phenomenon.SOLUTION: A fiber depositing method of the present invention comprises: an outflowing step of causing a raw material solution 300 to outflow from a flow unit 115 into a fiber producing space where fiber 301 is produced from the raw material solution 300; a charging step of charging the raw material solution 300 by applying a voltage between the flow unit 115 and a charging electrode 121 disposed at a prescribed distance from the flow unit 115; a superposing step of superposing a first sheet 200 and a second sheet 201; a blowing step of blowing ion air A on a combined sheet 202 resulting from the superposing with a voltage applied between a generator 104 disposed on one side of the combined sheet 202 and a generating electrode 141 disposed on the other side thereof; and a sheet supplying step of supplying the combined sheet 202 to the fiber producing space.

Description

  The present invention relates to a fiber deposition apparatus and a fiber deposition method for producing a fiber (nanofiber) having a fineness of submicron order or nano order by electrostatic stretching phenomenon.

  As a method for producing a filamentous (fibrous) material made of a resin and having a submicron scale or nanoscale diameter, a method using an electrostatic stretching phenomenon (electrospinning) is known.

  This electrostatic stretching phenomenon means that a raw material liquid in which a solute such as a resin is dispersed or dissolved in a solvent is discharged (injected) into the space by a nozzle or the like, and an electric charge is applied to the raw material liquid to charge the space. This is a method of obtaining fine fibers by electrically stretching a raw material liquid in flight.

  The electrostatic stretching phenomenon will be described more specifically as follows. That is, the raw material liquid that has been charged and discharged into the space gradually evaporates the solvent while flying through the space. As a result, the volume of the raw material liquid in flight gradually decreases, but the charge imparted to the raw material liquid remains in the raw material liquid. As a result, the charge density of the raw material liquid in flight through the space gradually increases. Since the solvent continues to evaporate, the charge density of the raw material liquid further increases, and when the repulsive Coulomb force generated in the raw material liquid exceeds the surface tension of the raw material liquid, the raw material liquid explodes. The phenomenon that the film is stretched linearly occurs. This is the electrostatic stretching phenomenon. This electrostatic stretching phenomenon occurs one after another in the space in a geometric series, thereby producing a fiber made of a resin having a diameter of submicron order or nano order.

  When fibers produced using the electrostatic stretching phenomenon as described above are deposited on a long sheet-like base material, the raw material liquid is allowed to flow out from the nozzles arranged in a row to produce the fibers on the base material. In some cases, a fiber depositing apparatus is used for depositing. According to this fiber deposition apparatus, fibers can be deposited on a long substrate by gradually conveying the fibers deposited on the substrate in a direction perpendicular to the direction in which the nozzles are arranged.

  In this case, one of the qualities of the manufactured product is the uniformity of the fibers deposited on the substrate. For example, Patent Document 1 describes a fiber deposition apparatus that deposits fibers uniformly by providing an insulating layer that suppresses variation in resistance value in a region where fibers are deposited.

JP 2011-140740 A

  On the other hand, there are cases where fibers are desired to be deposited on a very thin substrate or a fragile substrate. In this case, the base material is bonded to a long band-shaped reinforcing material that is structurally strong and difficult to break or wrinkle, and the bonded sheet (hereinafter sometimes referred to as a “combined sheet”) By depositing the fibers on the substrate side surface, it is possible to continuously deposit the fibers even on the fragile sheet.

  However, as a result of the experiment and research repeated by the inventor of the present application, when fibers are deposited on the united sheet, it has been found that unexpected unevenness occurs in the fiber deposits. And further, by conducting experiments and research, the electric potential differs on the surface of the united sheet due to unevenness of the pasted body between the reinforcing material and the base material, for example, a partial difference in the degree of adhesion between the reinforcing material and the base material It was found that a portion was generated and unevenness of the fiber deposit was generated.

  The present invention has been made on the basis of the above findings, and an object of the present invention is to provide a fiber deposition method and a fiber deposition apparatus capable of depositing fibers uniformly on a united sheet.

  In order to achieve the above object, a fiber deposition method according to the present invention is a fiber deposition method in which a raw material liquid is electrically stretched in a space to produce a fiber, and the fiber is deposited on a long strip-shaped first sheet. An outflow step for flowing out the raw material liquid from an outflow body into a fiber manufacturing space in which the fibers are manufactured from the raw material liquid, a charging electrode arranged at a predetermined interval from the outflow body, and the outflow A charging step of charging the raw material liquid by applying a voltage between the body, the first sheet, and a long strip-shaped second sheet that is superimposed on the first sheet and moves together with the first sheet. A voltage is applied between the overlapping step of overlapping, and the generator disposed on one side and the generation electrode disposed on the other side of the merged sheet composed of the superimposed first sheet and second sheet. To the united sheet A step blowing blowing on air, is characterized in that it comprises a sheet supply step of supplying the united sheet on the fiber production space.

  By blowing ion wind onto the united sheet, it is possible to prevent the first sheet and the second sheet from coming into close contact with each other and to prevent partial unevenness in the potential of the united sheet surface when supplied to the fiber manufacturing space. Accordingly, it is possible to deposit the charged fibers on the first sheet side of the united sheet evenly due to the electrostatic stretching phenomenon.

  In order to achieve the above object, the fiber deposition apparatus according to the present invention is a fiber for producing a fiber by electrically stretching a raw material liquid in a space and depositing the fiber on a long strip-shaped first sheet. A deposition apparatus, an outflow body for flowing the raw material liquid into a fiber manufacturing space where the fibers are manufactured from the raw material liquid, a charging electrode arranged at a predetermined interval from the outflow body, and the outflow A charging power source for charging the raw material liquid by applying a voltage between the body and the charging electrode, the first sheet, and a long strip-shaped first layer that is superimposed on the first sheet and moves with the first sheet. A sheet supply means for supplying a united sheet comprising two sheets to the fiber manufacturing space; a generator that is arranged on one side of the united sheet and generates an ionic wind that blows on the united sheet; and the other side of the united sheet In Is location, characterized by comprising a generating electrode for concentrating a charge to the generator, and generating power source for applying a voltage between said generating electrode and said generator.

  Thereby, an ion wind can be sprayed on a united sheet and a 1st sheet and a 2nd sheet can be stuck. Accordingly, it is possible to suppress the occurrence of partial unevenness in the electric potential of the surface of the united sheet when supplied to the fiber manufacturing space, and it is generated by an electrostatic stretching phenomenon, and the fibers of the charged body are arranged on the first sheet side of the united sheet. It is possible to deposit uniformly.

  In addition, the generation electrode includes a first singular part where charge concentrates and a second singular part where charge concentrates, and the first singular part is upstream of the second singular part in the supply direction of the united sheet. It may be arranged at a position apart from the second singular part in the width direction of the united sheet on the side and perpendicular to the supply direction.

  According to this, the time which blows an ion wind in the width direction of a united sheet can be varied, and the air (space) existing between the first sheet and the second sheet is sequentially pushed out in the width direction of the united sheet. Can do. Accordingly, air accumulation (space) is less likely to occur between the first sheet and the second sheet, and uneven adhesion between the first sheet and the second sheet can be suppressed.

  The charging electrode and the generating electrode may have different potentials.

  According to this, the charged state of the united sheet to which the ion wind is blown can be suppressed or canceled by the potential of the charging electrode, and the uniformity of the fiber deposit can be ensured.

  According to the present invention, it is possible to uniformly deposit fibers generated by the electrostatic stretching phenomenon in a state in which the first sheet and the second sheet are closely adhered.

FIG. 1 is a perspective view showing a fiber deposition apparatus. FIG. 2 is a perspective view showing the outflow body cut along the XZ plane. FIG. 3 is a plan view showing another example of the array of singular parts of the generator. FIG. 4 is a side view showing the fiber deposition apparatus from the side.

  Next, embodiments of a fiber deposition method and a fiber deposition apparatus according to the present invention will be described with reference to the drawings. The following embodiments are merely examples of the fiber deposition method and the fiber deposition apparatus according to the present invention. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments.

  FIG. 1 is a perspective view showing a fiber deposition apparatus.

  As shown in the figure, the fiber deposition apparatus 100 is an apparatus for producing a fiber 301 by electrically stretching a raw material liquid 300 in a space and depositing the fiber 301 on a long strip-shaped first sheet 200. , Outflow body 115, charging electrode 121, charging power source 122, sheet supply means 140 for supplying the united sheet 202 in which the first sheet 200 and the second sheet 201 are overlaid, the generator 104, and the generator electrode 141. And a generation power source 142.

  FIG. 2 is a perspective view showing the outflow body cut along the XZ plane.

  The outflow body 115 is a member having a plurality of outflow holes 118 through which the raw material liquid 300 flows out. The outflow holes 118 are arranged extending in the vertical direction (Z-axis direction in the figure), arranged so as to be aligned in the Y-axis direction at a predetermined interval, and arranged so as to be parallel to each other.

  In the case of the present embodiment, the outflow body 115 includes a storage tank 113 that temporarily stores the raw material liquid 300 and supplies the raw material liquid equally to the respective outflow holes 118.

  The outflow body 115 also functions as an electrode for supplying electric charge to the outflowing raw material liquid 300, and at least a part of the portion in contact with the raw material liquid 300 is formed of a conductive member. In the case of the present embodiment, the entire outflow body 115 is made of metal, and the entire front end portion 116 of the outflow body 115 can be uniformly charged. In addition, the kind of metal which comprises the outflow body 115 will not be specifically limited if it has electroconductivity, For example, arbitrary materials, such as brass, stainless steel, aluminum, and its alloy, can be selected.

  The intervals at which the outflow holes 118 are arranged may be all equal, and the outflow holes are arranged so that the interval at the end of the outflow body 115 is wider (narrower) than the interval at the center of the outflow body 115. 118 may be arranged. The outflow holes 118 are not only arranged on the same straight line, but may also be arranged in a zigzag pattern or may be arranged so as to draw a wave such as a sine curve.

  The front end portion 116 is a portion of the outflow body 115 in which the opening portion of the outflow hole 118 is disposed, and is a portion that connects the openings disposed at a predetermined interval with a smooth surface. In the case of the present embodiment, the tip portion 116 has an elongated rectangular flat surface on the surface.

  As shown in FIG. 2, the storage tank 113 is formed inside the outflow body 115, and temporarily stores the raw material liquid 300 supplied from the raw material liquid supply means 107 (see FIG. 1) inside the outflow body 115. It is a tank to do. The storage tank 113 is connected to the plurality of outflow holes 118 and supplies the raw material liquid 300 to the plurality of outflow holes 118 at the same time. In the case of the present embodiment, one outflow body 115 is provided, extends from one end of the outflow body 115 in the Y-axis direction to the other end, and is connected to all outflow holes 118 in communication. Yes.

  The shape and mode of the outflow body 115 are not particularly limited, and the outflow hole 118 may be provided on the peripheral wall of a circular pipe or a rectangular pipe. In addition, a plurality of nozzles arranged in a row or matrix may be used as the outflow body.

  As shown in FIG. 1, the raw material liquid supply means 107 is a device that supplies the raw material liquid 300 to the effluent body 115, and conveys the raw material liquid 300 at a predetermined pressure and a container 171 that stores the raw material liquid 300 in large quantities. A pump (not shown) and a guide tube 114 for guiding the raw material liquid 300 are provided.

  The charging electrode 121 is a member that is arranged at a predetermined interval from the effluent body 115 and induces electric charges to the effluent body 115 by itself becoming a high voltage or a low voltage with respect to the effluent body 115. In the case of the present embodiment, as shown in FIG. 1, the charging electrode 121 also functions as an attracting means for electrically attracting the fiber 301 manufactured in the fiber manufacturing space. In the case of the present embodiment, the charging electrode 121 includes an endless belt 125 having conductivity that moves as the united sheet 202 moves, and a plurality of rollers 126 that maintain the track of the endless belt 125. .

  In addition, the charging electrode 121 may be one in which a plurality of conductive rollers are arranged like a roller conveyor, and an arbitrary member such as a plate-like member may be employed.

  The charging power source 122 is a power source that can apply a high voltage (to the charging electrode 121) to the effluent body 115. In the case of the present embodiment, the charging power source 122 is a DC power source and can apply a ground potential or a potential selected from a value in the range of 5 KV to 100 KV to the charging electrode 121. It has become.

  In the case of the present embodiment, the fiber deposition apparatus 100 includes an auxiliary power source 123. The auxiliary power source 123 is connected in series with the charging power source 122, applies a potential different from the ground potential to the charging electrode 121, and cooperates with the charging power source 122 to provide a high voltage between the outflow body 115 and the charging electrode 121. This is a power supply for applying a voltage. For example, a potential of +75 kV with respect to the ground potential is applied to the effluent 115 by the charging power source 122, and a potential of −15 kV with respect to the ground potential is applied to the charging electrode 121 by the auxiliary power source 123, whereby the effluent 115 is positively charged. Is induced, and a positive charge can be imparted to the raw material liquid 300.

  In this way, when the casing (not shown) covering the fiber deposition apparatus 100 is set to the ground potential by applying the potential so that the installation potential is between the outflow body 115 and the charging electrode 121, the charging is performed. The electrode 121 is at a lower (or higher) potential than the housing, and the fibers 301 generated in the fiber manufacturing space can be attracted efficiently. In addition, a potential different from that of the generation electrode 141 can be applied to the charging electrode 121.

  The charging electrode 121 may be set to the ground potential without providing the auxiliary power source 123.

  The generator 104 is a member that is arranged on one side of the united sheet 202 and generates an ion wind A that is blown onto the united sheet 202.

  Here, the ion wind is considered to be generated by the following phenomenon. That is, when charges are concentrated on a part of a conductor to which a high voltage is applied, air existing around the part is charged (ionized). The charged (ionized) air repels the electric charge of the conductor and jumps out into the space, thereby generating an ion wind that is a flow of air containing ions (charged). In particular, it has been found that ion wind is likely to be generated at a portion having a specific shape such as the tip of a protrusion or the tip of a corner.

  In the case of the present embodiment, the generator 104 is provided with a plurality of shape-specific portions where charges are concentrated in the width direction of the plurality of united sheets 202. More specifically, the generator 104 includes the singular part 109 (the first singular part 191 to the seventh singular part 197) pointed toward the generation electrode 141 in the width direction of the united sheet 202. The first unique portion 191 is upstream of the second unique portion 192 in the supply direction (X-axis direction) of the merged sheet 202 and in the width direction (Y-axis direction) of the merged sheet 202 perpendicular to the supply direction. It is arranged at a position away from the second singular part 192. Further, the relationship between the second singular part 192 and the third singular part 193 and the positional relation between the third singular part 193 and the fourth singular part 194 are the same. The positional relationship among the first singular part 191, the fifth singular part 195, the sixth singular part 196, and the seventh singular part 197 is also the same, and the first singular part 191 as a whole is the most upstream, and the singular part 109 Are arranged to draw a V-shape.

  Thus, by arranging the singular part 109, the ion wind A is blown to the part of the united sheet 202 corresponding to the first singular part 191, and the first sheet 200 and the second sheet 201 in the part are in close contact with each other. . Next, the first sheet 200 and the second sheet 201 corresponding to the second singular part 192 and the fifth singular part 195 are in close contact with each other. Thereby, the air (space) included between the first sheet 200 and the second sheet 201 at the center of the united sheet 202 is pushed out toward the outside in the width direction of the united sheet 202. By sequentially advancing the partial adhesion toward the outside in the width direction, there is no air (space) between the first sheet 200 and the second sheet 201, and the first sheet 200 without wrinkles. The second sheet 201 can be uniformly adhered over the entire width direction of the united sheet 202.

  As shown in FIG. 3, the singular part 109 may be arranged so as to be obliquely arranged from one side to the other side in the width direction of the united sheet 202.

  The generation electrode 141 is disposed on the other side of the united sheet 202 and concentrates electric charges on the generation body 104. The generation electrode 141 is arranged on the opposite side of the generation body 104 with respect to the united sheet 202 with a predetermined interval from the generation body 104, and the generation electrode 104 becomes a high voltage or a low voltage with respect to the generation body 104. It is a member for inducing electric charge in (particularly the singular part 109 that is unique in shape). In the case of the present embodiment, the generation electrode 141 has the same structure as that of the charging electrode 121, and the endless belt 145 having conductivity that moves in accordance with the movement of the united sheet 202 and the track of the endless belt 145. It comprises a plurality of rollers 146 to be maintained. Further, the generation electrode 141 is grounded and has a ground potential.

  The generation electrode 141 may be a plurality of conductive rollers arranged like a roller conveyor, or an arbitrary one such as a plate-like member may be adopted.

  The generation power source 142 is a power source for generating a ionic wind by applying a voltage between the generator 104 and the generation electrode 141. In the case of the present embodiment, the charging power source 122 also functions as the generation power source 142. That is, the outflow body 115 and the generation body 104 are connected by a conductive member 149 (see FIG. 1) such as a bus bar, and the outflow body 115 and the generation body 104 have the same potential by the charging power source 122 (generation power supply 142). It is to be applied.

  In the case of the present embodiment, the interval between the generator 104 and the generation electrode 141 is shorter than the interval between the outflow body 115 and the charging electrode 121. By adopting such an aspect, the influence of the ion wind A on the generation and deposition of the fibers 301 is suppressed. Further, the generation of the ion wind A is controlled by adjusting the distance from the generation electrode 141 for the generator 104 whose potential cannot be individually controlled.

  FIG. 4 is a side view showing the fiber deposition apparatus from the side.

  The first sheet 200 is a member that deposits and attaches fibers 301 produced by an electrostatic stretching phenomenon. In the case of the present embodiment, the first sheet 200 is supplied in a state of being wound around the first roll 127.

  The material type of the first sheet 200 is not particularly limited, and examples thereof include a resin nonwoven fabric, a woven fabric, and a film. For example, paper (nonwoven fabric of cellulose), a polyamide-based resin, polyethylene, polypropylene, a first sheet 200 made of polyvinylidene fluoride, and the like can be exemplified. Further, although the shape of the first sheet 200 is not particularly limited, it is considered that a thickness of less than 100 μm, preferably several tens of μm or less, is suitable for the close contact with the second sheet 201 by the ion wind A. .

  In the figure, the first sheet 200 and the second sheet 201 are shown to be thick and have the same thickness, but the thickness of the first sheet 200 is actually about one tenth of that of the second sheet 201. .

  The second sheet 201 is a long strip member that is overlapped with the first sheet 200 and moves together with the first sheet 200. In the case of the present embodiment, the second sheet 201 functions as a reinforcing material that is superimposed on the first sheet 200 and structurally reinforces the first sheet. In the case of the present embodiment, the second sheet 201 is supplied in a state of being wound around the second roll 128.

  The material type of the second sheet 201 is not particularly limited, and examples thereof include a resin nonwoven fabric, a woven fabric, and a film. For example, the second sheet 201 made of paper (nonwoven fabric of cellulose), polyamide resin, polyethylene, polypropylene, polyvinylidene fluoride, PET resin, or ABS resin can be exemplified.

  Also, the shape of the second sheet 201 is not particularly limited, but for the purpose of structurally reinforcing the first sheet 200, the thickness is about ten times that of the first sheet 200, specifically 100 μm or more. Is considered suitable.

  The sheet supply unit 140 continuously pulls out the first sheet 200 from the first roll 127 while winding the united sheet 202 in which the first sheet 200 and the second sheet 201 overlap with the recovery roll 103 and from the second roll 128. The second sheet 201 is continuously pulled out, and the united sheet 202 is continuously supplied into the fiber manufacturing space.

  Next, a fiber deposition method in which the raw material liquid 300 is electrically stretched in the space to produce the fibers 301 and the fibers 301 are deposited on the long belt-like first sheet 200 will be described.

  First, the raw material liquid 300 is supplied to the storage tank 113 of the effluent 115 (raw material liquid supply step). As described above, the raw material liquid 300 is filled in the storage tank 113 of the effluent 115.

  Here, the raw material liquid 300 is a solution containing a solute and a solvent for dissolving or dispersing the solute.

  The solute is a resin (polymer resin) material constituting the fiber 301. Specifically, 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, polyamide, aramid, polyimide, polycaprolactone, polylactic acid, polyglycolic acid, collagen, polyhydride Carboxymethyl acid, polyvinyl acetate, polypeptide or the like and can be exemplified resins such copolymers thereof.

  The solute may be one kind selected from the above, or a plurality of kinds may be mixed. In addition, the above is an illustration and this invention is not limited to the said solute.

  The solvent is a volatile liquid having a volatile property. Specifically, 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, odor Ethyl chloride, propyl bromide, acetic acid, benzene, toluene, hexane, cyclohexane, cyclohexanone, cyclopentane, o-xylene, p-xylene, m-xylene, acetonitrile, tetrahydrofuran, N, N-dimethylformamide, N, N-dimethyl Acetamide, dimethyl sulfoxide, pyridine, water and the like can be listed.

  The solvent may be one type selected from the above, or a plurality of types may be mixed. In addition, the above is an illustration and this invention is not limited to the said solvent.

Furthermore, an inorganic solid material or the like may be added to the raw material liquid 300. Examples of the inorganic solid material include oxides, carbides, nitrides, borides, silicides, fluorides, sulfides, and the like. It is preferable to use a product. Examples of the oxide include Al ₂ O ₃ , SiO ₂ , TiO ₂ , Li ₂ O, Na ₂ O, MgO, CaO, SrO, BaO, B ₂ O ₃ , P ₂ O ₅ , SnO ₂ , ZrO ₂ , K. ₂ O, Cs ₂ O, ZnO, Sb ₂ O ₃ , As ₂ O ₃ , CeO ₂ , V ₂ O ₅ , Cr ₂ O ₃ , MnO, Fe ₂ O ₃ , CoO, NiO, Y ₂ O ₃ , Lu ₂ Examples thereof include O ₃ , Yb ₂ O ₃ , HfO ₂ , Nb ₂ O _{5 and the} like. Moreover, the kind selected from the above may be used, and a plurality of kinds may be mixed. Note that the above is an example, and the present invention is not affected by whether or not the additive is included in the raw material liquid 300.

  The mixing ratio of the solvent and the solute in the raw material liquid 300 varies depending on the type of solvent selected and the type of solute, but the amount of solvent is preferably between about 60 wt% and 98 wt%. Preferably, the solute is in the range of 5% to 30% by weight.

  Next, the raw material liquid 300 is caused to flow out from the outflow body 115 into the fiber manufacturing space where the fibers 301 are manufactured from the raw material liquid 300 (outflow process).

  Next, a high voltage is applied between the effluent body 115 and the charging electrode 121 by the charging power source 122 (including the auxiliary power source 123 in this embodiment). Charge concentrates on the tip 116 of the effusing body 115 facing the charging electrode 121, and the charge passes through the outflow hole 118 and is transferred to the raw material liquid 300 flowing into the fiber manufacturing space, and the raw material liquid 300 is charged ( Charging step).

  Next, the fiber 301 is manufactured by the electrostatic stretching phenomenon acting on the raw material liquid 300 that has flew to some extent in the fiber manufacturing space (fiber manufacturing process).

  On the other hand, the second sheet 201 is superimposed on the back surface of the first sheet 200, that is, the surface of the first sheet 200 on which the fibers 301 are not deposited (superposition process). In the case of the present embodiment, the first sheet 200 and the second sheet 201 are overlapped by substantially matching the passage path of the first sheet and the passage path of the second sheet 201.

  In addition, as a superimposition process, the 1st sheet | seat 200 and the 2nd sheet | seat 201 may be pinched | interposed with two rollers, and it may superimpose by applying a pressure.

  Next, the generated power supply 142 (this embodiment) is provided between the generator 104 arranged on one side of the united sheet 202 composed of the first sheet 200 and the second sheet 201 and the generator electrode 141 arranged on the other side. In this case, a voltage is applied by the charging power source 122), and the ion wind A is sprayed onto the united sheet 202 (a spraying step).

  Thereby, the first sheet 200 is charged, and the first sheet 200 and the second sheet 201 are brought into close contact with each other by electrostatic force.

  Moreover, in this Embodiment, the ion wind A is first sprayed with respect to the center part of the width direction of the united sheet 202, and the ion wind A is sprayed in order toward the edge part of the united sheet 202 in the width direction.

  Accordingly, the first sheet 200 and the second sheet can be brought into close contact with each other while the air (space) contained between the first sheet 200 and the second sheet 201 is pushed out to the end portion in the width direction of the united sheet 202. It becomes.

  The spraying process may be performed on the first sheet 200 and the second sheet 201 before the overlapping process.

  Alternatively, the ion wind A may be blown first on one end portion in the width direction of the united sheet 202, and the ion wind A may be sequentially sprayed toward the other end portion in the width direction of the united sheet 202.

  On the other hand, the united sheet 202 is supplied to the fiber manufacturing space (sheet supply process). In the case of the present embodiment, the united sheet 202 is supplied so as to be in contact with the endless belt 145 of the generation electrode 141 between the generation body 104 and the generation electrode 141. Further, the united sheet 202 is supplied so as to be in contact with the surface of the endless belt 125 of the charging electrode 121 in the fiber manufacturing space between the outflow body 115 and the charging electrode 121.

  Next, the fibers 301 are attracted to the charging electrode 121, and the fibers 301 are deposited on the surface of the united sheet 202 on the first sheet 200 side (deposition step). The first sheet 200 on which the fibers 301 are deposited is taken up together with the second sheet 201 by the sheet supply unit 140.

  In the united sheet 202 in the wound state, the second sheet 201 also functions as a separator that prevents the accumulated fibers 301 and the first sheet 200 from adhering to each other.

  Thus, the first sheet 200 on which the fibers 301 are deposited can be obtained.

  By performing the above fiber deposition method using the fiber deposition apparatus 100 having the above configuration, the first sheet 200 is supplied to the fiber manufacturing space in a state of being in close contact with the second sheet 201. The charged sheet (conductivity) of the first sheet 200 becomes uniform, and the fibers 301 can be uniformly deposited on the first sheet 200.

  In particular, when the first sheet 200 is a fragile one that is easily torn or wrinkled when pulled by the sheet supply means 140, the second sheet 201 is for reinforcing the mechanical strength of the first sheet 200. By functioning as a reinforcing material, the fibers 301 can be uniformly deposited on the first sheet 200.

  In addition, since the first sheet 200 is in close contact with the second sheet 201, both ends in the width direction of the first sheet 200 warp when the accumulated fibers 301 contract (or expand) due to drying. The first sheet 200 can be prevented from wrinkling.

  Furthermore, since the first sheet 200 and the second sheet 201 are not attached with an adhesive or the like, there is no need to worry about the adhesive remaining, and the first sheet 200 and the second sheet on which the fibers 301 are deposited. Can also be separated.

  In addition, this invention is not limited to the said embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning described in the claims. It is.

  For example, a partition wall that separates the fiber manufacturing space from the space to which the ionic wind A is blown may be provided between the generator 104 and the effluent body 115. Thereby, the influence of the ion wind A given to the flight of the fiber 301 can be suppressed. Moreover, the influence of the ion wind A can also be suppressed by setting the distance between the effluent 115 and the generator 104 to about 75 cm.

  The present invention can be applied to the production of a sheet-like base material in which fibers having submicron order or nano order wire diameters are uniformly deposited, and the production of an insulating layer between electrode plates provided in a capacitor, a capacitor, a secondary battery, etc. In addition, it can be applied to the manufacture of high-function filters and the like.

DESCRIPTION OF SYMBOLS 100 Fiber deposition apparatus 103 Recovery roll 104 Generator 107 Raw material liquid supply means 109 Different part 113 Storage tank 114 Guide pipe 115 Outflow body 116 Outlet part 118 Outflow hole 121 Charging electrode 122 Charging power supply 123 Auxiliary power supply 125 Endless belt 126 Roller 127 First Roll 128 Second roll 140 Sheet supply means 141 Generating electrode 142 Generating power supply 145 Endless belt 146 Roller 149 Conductive member 171 Container 191 First specific part 192 Second specific part 193 Third specific part 194 Fourth specific part 195 Fifth specific part 196 6th peculiar part 197 7th peculiar part 200 1st sheet 201 2nd sheet 202 united sheet 300 Raw material liquid 301 Fiber

Claims (5)

A fiber deposition method for producing a fiber by electrically stretching a raw material liquid in a space, and depositing the fiber on a long strip-shaped first sheet,
An outflow step of causing the raw material liquid to flow out from an effluent into a fiber manufacturing space in which the fibers are manufactured from the raw material liquid;
A charging step of charging the raw material liquid by applying a voltage between the outflow body and the charging electrode disposed at a predetermined interval from the outflow body;
A superimposing step of superimposing the first sheet and a long strip-shaped second sheet that is superimposed on the first sheet and moves with the first sheet;
A voltage is applied between the generator disposed on one side of the united sheet composed of the first sheet and the second sheet superimposed and the generator electrode disposed on the other side, and an ion wind is applied to the united sheet. Spraying process of spraying,
A fiber deposition method including a sheet supply step of supplying the united sheet to the fiber manufacturing space. A fiber deposition apparatus for producing a fiber by electrically stretching a raw material liquid in a space, and depositing the fiber on a long strip-shaped first sheet,
An outflow body that causes the raw material liquid to flow out into the fiber manufacturing space in which the fibers are manufactured from the raw material liquid;
A charging electrode disposed at a predetermined interval from the effluent body;
A charging power source for charging the raw material liquid by applying a voltage between the effluent and the charging electrode;
Sheet supply means for supplying a united sheet composed of the first sheet and a long strip-shaped second sheet that is superimposed on the first sheet and moves together with the first sheet to the fiber manufacturing space;
A generator that is arranged on one side of the united sheet and generates an ionic wind that blows on the united sheet;
A generating electrode disposed on the other side of the united sheet and concentrating charges on the generator;
A fiber deposition apparatus comprising a generation power source for applying a voltage between the generator and the generation electrode. The generating electrode includes a first singular part where charges concentrate and a second singular part where charges concentrate.
The first unique portion is disposed at a position upstream from the second unique portion in the supply direction of the merged sheet and at a position away from the second unique portion in the width direction of the merged sheet perpendicular to the supply direction. The fiber deposition apparatus according to claim 2. The fiber deposition apparatus according to claim 2, wherein the charging electrode and the generating electrode have different potentials. The fiber deposition apparatus according to claim 4, wherein the outflow body and the generator are at the same potential.

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